Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* $Id: serial.c,v 1.25 2004/09/29 10:33:49 starvik Exp $ |
| 2 | * |
| 3 | * Serial port driver for the ETRAX 100LX chip |
| 4 | * |
| 5 | * Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003 Axis Communications AB |
| 6 | * |
| 7 | * Many, many authors. Based once upon a time on serial.c for 16x50. |
| 8 | * |
| 9 | * $Log: serial.c,v $ |
| 10 | * Revision 1.25 2004/09/29 10:33:49 starvik |
| 11 | * Resolved a dealock when printing debug from kernel. |
| 12 | * |
| 13 | * Revision 1.24 2004/08/27 23:25:59 johana |
| 14 | * rs_set_termios() must call change_speed() if c_iflag has changed or |
| 15 | * automatic XOFF handling will be enabled and transmitter will stop |
| 16 | * if 0x13 is received. |
| 17 | * |
| 18 | * Revision 1.23 2004/08/24 06:57:13 starvik |
| 19 | * More whitespace cleanup |
| 20 | * |
| 21 | * Revision 1.22 2004/08/24 06:12:20 starvik |
| 22 | * Whitespace cleanup |
| 23 | * |
| 24 | * Revision 1.20 2004/05/24 12:00:20 starvik |
| 25 | * Big merge of stuff from Linux 2.4 (e.g. manual mode for the serial port). |
| 26 | * |
| 27 | * Revision 1.19 2004/05/17 13:12:15 starvik |
| 28 | * Kernel console hook |
| 29 | * Big merge from Linux 2.4 still pending. |
| 30 | * |
| 31 | * Revision 1.18 2003/10/28 07:18:30 starvik |
| 32 | * Compiles with debug info |
| 33 | * |
| 34 | * Revision 1.17 2003/07/04 08:27:37 starvik |
| 35 | * Merge of Linux 2.5.74 |
| 36 | * |
| 37 | * Revision 1.16 2003/06/13 10:05:19 johana |
| 38 | * Help the user to avoid trouble by: |
| 39 | * Forcing mixed mode for status/control lines if not all pins are used. |
| 40 | * |
| 41 | * Revision 1.15 2003/06/13 09:43:01 johana |
| 42 | * Merged in the following changes from os/linux/arch/cris/drivers/serial.c |
| 43 | * + some minor changes to reduce diff. |
| 44 | * |
| 45 | * Revision 1.49 2003/05/30 11:31:54 johana |
| 46 | * Merged in change-branch--serial9bit that adds CMSPAR support for sticky |
| 47 | * parity (mark/space) |
| 48 | * |
| 49 | * Revision 1.48 2003/05/30 11:03:57 johana |
| 50 | * Implemented rs_send_xchar() by disabling the DMA and writing manually. |
| 51 | * Added e100_disable_txdma_channel() and e100_enable_txdma_channel(). |
| 52 | * Fixed rs_throttle() and rs_unthrottle() to properly call rs_send_xchar |
| 53 | * instead of setting info->x_char and check the CRTSCTS flag before |
| 54 | * controlling the rts pin. |
| 55 | * |
| 56 | * Revision 1.14 2003/04/09 08:12:44 pkj |
| 57 | * Corrected typo changes made upstream. |
| 58 | * |
| 59 | * Revision 1.13 2003/04/09 05:20:47 starvik |
| 60 | * Merge of Linux 2.5.67 |
| 61 | * |
| 62 | * Revision 1.11 2003/01/22 06:48:37 starvik |
| 63 | * Fixed warnings issued by GCC 3.2.1 |
| 64 | * |
| 65 | * Revision 1.9 2002/12/13 09:07:47 starvik |
| 66 | * Alert user that RX_TIMEOUT_TICKS==0 doesn't work |
| 67 | * |
| 68 | * Revision 1.8 2002/12/11 13:13:57 starvik |
| 69 | * Added arch/ to v10 specific includes |
| 70 | * Added fix from Linux 2.4 in serial.c (flush_to_flip_buffer) |
| 71 | * |
| 72 | * Revision 1.7 2002/12/06 07:13:57 starvik |
| 73 | * Corrected work queue stuff |
| 74 | * Removed CONFIG_ETRAX_SERIAL_FLUSH_DMA_FAST |
| 75 | * |
| 76 | * Revision 1.6 2002/11/21 07:17:46 starvik |
| 77 | * Change static inline to extern inline where otherwise outlined with gcc-3.2 |
| 78 | * |
| 79 | * Revision 1.5 2002/11/14 15:59:49 starvik |
| 80 | * Linux 2.5 port of the latest serial driver from 2.4. The work queue stuff |
| 81 | * probably doesn't work yet. |
| 82 | * |
| 83 | * Revision 1.42 2002/11/05 09:08:47 johana |
| 84 | * Better implementation of rs_stop() and rs_start() that uses the XOFF |
| 85 | * register to start/stop transmission. |
| 86 | * change_speed() also initilises XOFF register correctly so that |
| 87 | * auto_xoff is enabled when IXON flag is set by user. |
| 88 | * This gives fast XOFF response times. |
| 89 | * |
| 90 | * Revision 1.41 2002/11/04 18:40:57 johana |
| 91 | * Implemented rs_stop() and rs_start(). |
| 92 | * Simple tests using hwtestserial indicates that this should be enough |
| 93 | * to make it work. |
| 94 | * |
| 95 | * Revision 1.40 2002/10/14 05:33:18 starvik |
| 96 | * RS-485 uses fast timers even if SERIAL_FAST_TIMER is disabled |
| 97 | * |
| 98 | * Revision 1.39 2002/09/30 21:00:57 johana |
| 99 | * Support for CONFIG_ETRAX_SERx_DTR_RI_DSR_CD_MIXED where the status and |
| 100 | * control pins can be mixed between PA and PB. |
| 101 | * If no serial port uses MIXED old solution is used |
| 102 | * (saves a few bytes and cycles). |
| 103 | * control_pins struct uses masks instead of bit numbers. |
| 104 | * Corrected dummy values and polarity in line_info() so |
| 105 | * /proc/tty/driver/serial is now correct. |
| 106 | * (the E100_xxx_GET() macros is really active low - perhaps not obvious) |
| 107 | * |
| 108 | * Revision 1.38 2002/08/23 11:01:36 starvik |
| 109 | * Check that serial port is enabled in all interrupt handlers to avoid |
| 110 | * restarts of DMA channels not assigned to serial ports |
| 111 | * |
| 112 | * Revision 1.37 2002/08/13 13:02:37 bjornw |
| 113 | * Removed some warnings because of unused code |
| 114 | * |
| 115 | * Revision 1.36 2002/08/08 12:50:01 starvik |
| 116 | * Serial interrupt is shared with synchronous serial port driver |
| 117 | * |
| 118 | * Revision 1.35 2002/06/03 10:40:49 starvik |
| 119 | * Increased RS-485 RTS toggle timer to 2 characters |
| 120 | * |
| 121 | * Revision 1.34 2002/05/28 18:59:36 johana |
| 122 | * Whitespace and comment fixing to be more like etrax100ser.c 1.71. |
| 123 | * |
| 124 | * Revision 1.33 2002/05/28 17:55:43 johana |
| 125 | * RS-485 uses FAST_TIMER if enabled, and starts a short (one char time) |
| 126 | * timer from tranismit_chars (interrupt context). |
| 127 | * The timer toggles RTS in interrupt context when expired giving minimum |
| 128 | * latencies. |
| 129 | * |
| 130 | * Revision 1.32 2002/05/22 13:58:00 johana |
| 131 | * Renamed rs_write() to raw_write() and made it inline. |
| 132 | * New rs_write() handles RS-485 if configured and enabled |
| 133 | * (moved code from e100_write_rs485()). |
| 134 | * RS-485 ioctl's uses copy_from_user() instead of verify_area(). |
| 135 | * |
| 136 | * Revision 1.31 2002/04/22 11:20:03 johana |
| 137 | * Updated copyright years. |
| 138 | * |
| 139 | * Revision 1.30 2002/04/22 09:39:12 johana |
| 140 | * RS-485 support compiles. |
| 141 | * |
| 142 | * Revision 1.29 2002/01/14 16:10:01 pkj |
| 143 | * Allocate the receive buffers dynamically. The static 4kB buffer was |
| 144 | * too small for the peaks. This means that we can get rid of the extra |
| 145 | * buffer and the copying to it. It also means we require less memory |
| 146 | * under normal operations, but can use more when needed (there is a |
| 147 | * cap at 64kB for safety reasons). If there is no memory available |
| 148 | * we panic(), and die a horrible death... |
| 149 | * |
| 150 | * Revision 1.28 2001/12/18 15:04:53 johana |
| 151 | * Cleaned up write_rs485() - now it works correctly without padding extra |
| 152 | * char. |
| 153 | * Added sane default initialisation of rs485. |
| 154 | * Added #ifdef around dummy variables. |
| 155 | * |
| 156 | * Revision 1.27 2001/11/29 17:00:41 pkj |
| 157 | * 2kB seems to be too small a buffer when using 921600 bps, |
| 158 | * so increase it to 4kB (this was already done for the elinux |
| 159 | * version of the serial driver). |
| 160 | * |
| 161 | * Revision 1.26 2001/11/19 14:20:41 pkj |
| 162 | * Minor changes to comments and unused code. |
| 163 | * |
| 164 | * Revision 1.25 2001/11/12 20:03:43 pkj |
| 165 | * Fixed compiler warnings. |
| 166 | * |
| 167 | * Revision 1.24 2001/11/12 15:10:05 pkj |
| 168 | * Total redesign of the receiving part of the serial driver. |
| 169 | * Uses eight chained descriptors to write to a 4kB buffer. |
| 170 | * This data is then serialised into a 2kB buffer. From there it |
| 171 | * is copied into the TTY's flip buffers when they become available. |
| 172 | * A lot of copying, and the sizes of the buffers might need to be |
| 173 | * tweaked, but all in all it should work better than the previous |
| 174 | * version, without the need to modify the TTY code in any way. |
| 175 | * Also note that erroneous bytes are now correctly marked in the |
| 176 | * flag buffers (instead of always marking the first byte). |
| 177 | * |
| 178 | * Revision 1.23 2001/10/30 17:53:26 pkj |
| 179 | * * Set info->uses_dma to 0 when a port is closed. |
| 180 | * * Mark the timer1 interrupt as a fast one (SA_INTERRUPT). |
| 181 | * * Call start_flush_timer() in start_receive() if |
| 182 | * CONFIG_ETRAX_SERIAL_FLUSH_DMA_FAST is defined. |
| 183 | * |
| 184 | * Revision 1.22 2001/10/30 17:44:03 pkj |
| 185 | * Use %lu for received and transmitted counters in line_info(). |
| 186 | * |
| 187 | * Revision 1.21 2001/10/30 17:40:34 pkj |
| 188 | * Clean-up. The only change to functionality is that |
| 189 | * CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS(=5) is used instead of |
| 190 | * MAX_FLUSH_TIME(=8). |
| 191 | * |
| 192 | * Revision 1.20 2001/10/30 15:24:49 johana |
| 193 | * Added char_time stuff from 2.0 driver. |
| 194 | * |
| 195 | * Revision 1.19 2001/10/30 15:23:03 johana |
| 196 | * Merged with 1.13.2 branch + fixed indentation |
| 197 | * and changed CONFIG_ETRAX100_XYS to CONFIG_ETRAX_XYZ |
| 198 | * |
| 199 | * Revision 1.18 2001/09/24 09:27:22 pkj |
| 200 | * Completed ext_baud_table[] in cflag_to_baud() and cflag_to_etrax_baud(). |
| 201 | * |
| 202 | * Revision 1.17 2001/08/24 11:32:49 ronny |
| 203 | * More fixes for the CONFIG_ETRAX_SERIAL_PORT0 define. |
| 204 | * |
| 205 | * Revision 1.16 2001/08/24 07:56:22 ronny |
| 206 | * Added config ifdefs around ser0 irq requests. |
| 207 | * |
| 208 | * Revision 1.15 2001/08/16 09:10:31 bjarne |
| 209 | * serial.c - corrected the initialization of rs_table, the wrong defines |
| 210 | * where used. |
| 211 | * Corrected a test in timed_flush_handler. |
| 212 | * Changed configured to enabled. |
| 213 | * serial.h - Changed configured to enabled. |
| 214 | * |
| 215 | * Revision 1.14 2001/08/15 07:31:23 bjarne |
| 216 | * Introduced two new members to the e100_serial struct. |
| 217 | * configured - Will be set to 1 if the port has been configured in .config |
| 218 | * uses_dma - Should be set to 1 if the port uses DMA. Currently it is set |
| 219 | * to 1 |
| 220 | * when a port is opened. This is used to limit the DMA interrupt |
| 221 | * routines to only manipulate DMA channels actually used by the |
| 222 | * serial driver. |
| 223 | * |
| 224 | * Revision 1.13.2.2 2001/10/17 13:57:13 starvik |
| 225 | * Receiver was broken by the break fixes |
| 226 | * |
| 227 | * Revision 1.13.2.1 2001/07/20 13:57:39 ronny |
| 228 | * Merge with new stuff from etrax100ser.c. Works but haven't checked stuff |
| 229 | * like break handling. |
| 230 | * |
| 231 | * Revision 1.13 2001/05/09 12:40:31 johana |
| 232 | * Use DMA_NBR and IRQ_NBR defines from dma.h and irq.h |
| 233 | * |
| 234 | * Revision 1.12 2001/04/19 12:23:07 bjornw |
| 235 | * CONFIG_RS485 -> CONFIG_ETRAX_RS485 |
| 236 | * |
| 237 | * Revision 1.11 2001/04/05 14:29:48 markusl |
| 238 | * Updated according to review remarks i.e. |
| 239 | * -Use correct types in port structure to avoid compiler warnings |
| 240 | * -Try to use IO_* macros whenever possible |
| 241 | * -Open should never return -EBUSY |
| 242 | * |
| 243 | * Revision 1.10 2001/03/05 13:14:07 bjornw |
| 244 | * Another spelling fix |
| 245 | * |
| 246 | * Revision 1.9 2001/02/23 13:46:38 bjornw |
| 247 | * Spellling check |
| 248 | * |
| 249 | * Revision 1.8 2001/01/23 14:56:35 markusl |
| 250 | * Made use of ser1 optional |
| 251 | * Needed by USB |
| 252 | * |
| 253 | * Revision 1.7 2001/01/19 16:14:48 perf |
| 254 | * Added kernel options for serial ports 234. |
| 255 | * Changed option names from CONFIG_ETRAX100_XYZ to CONFIG_ETRAX_XYZ. |
| 256 | * |
| 257 | * Revision 1.6 2000/11/22 16:36:09 bjornw |
| 258 | * Please marketing by using the correct case when spelling Etrax. |
| 259 | * |
| 260 | * Revision 1.5 2000/11/21 16:43:37 bjornw |
| 261 | * Fixed so it compiles under CONFIG_SVINTO_SIM |
| 262 | * |
| 263 | * Revision 1.4 2000/11/15 17:34:12 bjornw |
| 264 | * Added a timeout timer for flushing input channels. The interrupt-based |
| 265 | * fast flush system should be easy to merge with this later (works the same |
| 266 | * way, only with an irq instead of a system timer_list) |
| 267 | * |
| 268 | * Revision 1.3 2000/11/13 17:19:57 bjornw |
| 269 | * * Incredibly, this almost complete rewrite of serial.c worked (at least |
| 270 | * for output) the first time. |
| 271 | * |
| 272 | * Items worth noticing: |
| 273 | * |
| 274 | * No Etrax100 port 1 workarounds (does only compile on 2.4 anyway now) |
| 275 | * RS485 is not ported (why can't it be done in userspace as on x86 ?) |
| 276 | * Statistics done through async_icount - if any more stats are needed, |
| 277 | * that's the place to put them or in an arch-dep version of it. |
| 278 | * timeout_interrupt and the other fast timeout stuff not ported yet |
| 279 | * There be dragons in this 3k+ line driver |
| 280 | * |
| 281 | * Revision 1.2 2000/11/10 16:50:28 bjornw |
| 282 | * First shot at a 2.4 port, does not compile totally yet |
| 283 | * |
| 284 | * Revision 1.1 2000/11/10 16:47:32 bjornw |
| 285 | * Added verbatim copy of rev 1.49 etrax100ser.c from elinux |
| 286 | * |
| 287 | * Revision 1.49 2000/10/30 15:47:14 tobiasa |
| 288 | * Changed version number. |
| 289 | * |
| 290 | * Revision 1.48 2000/10/25 11:02:43 johana |
| 291 | * Changed %ul to %lu in printf's |
| 292 | * |
| 293 | * Revision 1.47 2000/10/18 15:06:53 pkj |
| 294 | * Compile correctly with CONFIG_ETRAX_SERIAL_FLUSH_DMA_FAST and |
| 295 | * CONFIG_ETRAX_SERIAL_PROC_ENTRY together. |
| 296 | * Some clean-up of the /proc/serial file. |
| 297 | * |
| 298 | * Revision 1.46 2000/10/16 12:59:40 johana |
| 299 | * Added CONFIG_ETRAX_SERIAL_PROC_ENTRY for statistics and debug info. |
| 300 | * |
| 301 | * Revision 1.45 2000/10/13 17:10:59 pkj |
| 302 | * Do not flush DMAs while flipping TTY buffers. |
| 303 | * |
| 304 | * Revision 1.44 2000/10/13 16:34:29 pkj |
| 305 | * Added a delay in ser_interrupt() for 2.3ms when an error is detected. |
| 306 | * We do not know why this delay is required yet, but without it the |
| 307 | * irmaflash program does not work (this was the program that needed |
| 308 | * the ser_interrupt() to be needed in the first place). This should not |
| 309 | * affect normal use of the serial ports. |
| 310 | * |
| 311 | * Revision 1.43 2000/10/13 16:30:44 pkj |
| 312 | * New version of the fast flush of serial buffers code. This time |
| 313 | * it is localized to the serial driver and uses a fast timer to |
| 314 | * do the work. |
| 315 | * |
| 316 | * Revision 1.42 2000/10/13 14:54:26 bennyo |
| 317 | * Fix for switching RTS when using rs485 |
| 318 | * |
| 319 | * Revision 1.41 2000/10/12 11:43:44 pkj |
| 320 | * Cleaned up a number of comments. |
| 321 | * |
| 322 | * Revision 1.40 2000/10/10 11:58:39 johana |
| 323 | * Made RS485 support generic for all ports. |
| 324 | * Toggle rts in interrupt if no delay wanted. |
| 325 | * WARNING: No true transmitter empty check?? |
| 326 | * Set d_wait bit when sending data so interrupt is delayed until |
| 327 | * fifo flushed. (Fix tcdrain() problem) |
| 328 | * |
| 329 | * Revision 1.39 2000/10/04 16:08:02 bjornw |
| 330 | * * Use virt_to_phys etc. for DMA addresses |
| 331 | * * Removed CONFIG_FLUSH_DMA_FAST hacks |
| 332 | * * Indentation fix |
| 333 | * |
| 334 | * Revision 1.38 2000/10/02 12:27:10 mattias |
| 335 | * * added variable used when using fast flush on serial dma. |
| 336 | * (CONFIG_FLUSH_DMA_FAST) |
| 337 | * |
| 338 | * Revision 1.37 2000/09/27 09:44:24 pkj |
| 339 | * Uncomment definition of SERIAL_HANDLE_EARLY_ERRORS. |
| 340 | * |
| 341 | * Revision 1.36 2000/09/20 13:12:52 johana |
| 342 | * Support for CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS: |
| 343 | * Number of timer ticks between flush of receive fifo (1 tick = 10ms). |
| 344 | * Try 0-3 for low latency applications. Approx 5 for high load |
| 345 | * applications (e.g. PPP). Maybe this should be more adaptive some day... |
| 346 | * |
| 347 | * Revision 1.35 2000/09/20 10:36:08 johana |
| 348 | * Typo in get_lsr_info() |
| 349 | * |
| 350 | * Revision 1.34 2000/09/20 10:29:59 johana |
| 351 | * Let rs_chars_in_buffer() check fifo content as well. |
| 352 | * get_lsr_info() might work now (not tested). |
| 353 | * Easier to change the port to debug. |
| 354 | * |
| 355 | * Revision 1.33 2000/09/13 07:52:11 torbjore |
| 356 | * Support RS485 |
| 357 | * |
| 358 | * Revision 1.32 2000/08/31 14:45:37 bjornw |
| 359 | * After sending a break we need to reset the transmit DMA channel |
| 360 | * |
| 361 | * Revision 1.31 2000/06/21 12:13:29 johana |
| 362 | * Fixed wait for all chars sent when closing port. |
| 363 | * (Used to always take 1 second!) |
| 364 | * Added shadows for directions of status/ctrl signals. |
| 365 | * |
| 366 | * Revision 1.30 2000/05/29 16:27:55 bjornw |
| 367 | * Simulator ifdef moved a bit |
| 368 | * |
| 369 | * Revision 1.29 2000/05/09 09:40:30 mattias |
| 370 | * * Added description of dma registers used in timeout_interrupt |
| 371 | * * Removed old code |
| 372 | * |
| 373 | * Revision 1.28 2000/05/08 16:38:58 mattias |
| 374 | * * Bugfix for flushing fifo in timeout_interrupt |
| 375 | * Problem occurs when bluetooth stack waits for a small number of bytes |
| 376 | * containing an event acknowledging free buffers in bluetooth HW |
| 377 | * As before, data was stuck in fifo until more data came on uart and |
| 378 | * flushed it up to the stack. |
| 379 | * |
| 380 | * Revision 1.27 2000/05/02 09:52:28 jonasd |
| 381 | * Added fix for peculiar etrax behaviour when eop is forced on an empty |
| 382 | * fifo. This is used when flashing the IRMA chip. Disabled by default. |
| 383 | * |
| 384 | * Revision 1.26 2000/03/29 15:32:02 bjornw |
| 385 | * 2.0.34 updates |
| 386 | * |
| 387 | * Revision 1.25 2000/02/16 16:59:36 bjornw |
| 388 | * * Receive DMA directly into the flip-buffer, eliminating an intermediary |
| 389 | * receive buffer and a memcpy. Will avoid some overruns. |
| 390 | * * Error message on debug port if an overrun or flip buffer overrun occurs. |
| 391 | * * Just use the first byte in the flag flip buffer for errors. |
| 392 | * * Check for timeout on the serial ports only each 5/100 s, not 1/100. |
| 393 | * |
| 394 | * Revision 1.24 2000/02/09 18:02:28 bjornw |
| 395 | * * Clear serial errors (overrun, framing, parity) correctly. Before, the |
| 396 | * receiver would get stuck if an error occurred and we did not restart |
| 397 | * the input DMA. |
| 398 | * * Cosmetics (indentation, some code made into inlines) |
| 399 | * * Some more debug options |
| 400 | * * Actually shut down the serial port (DMA irq, DMA reset, receiver stop) |
| 401 | * when the last open is closed. Corresponding fixes in startup(). |
| 402 | * * rs_close() "tx FIFO wait" code moved into right place, bug & -> && fixed |
| 403 | * and make a special case out of port 1 (R_DMA_CHx_STATUS is broken for that) |
| 404 | * * e100_disable_rx/enable_rx just disables/enables the receiver, not RTS |
| 405 | * |
| 406 | * Revision 1.23 2000/01/24 17:46:19 johana |
| 407 | * Wait for flush of DMA/FIFO when closing port. |
| 408 | * |
| 409 | * Revision 1.22 2000/01/20 18:10:23 johana |
| 410 | * Added TIOCMGET ioctl to return modem status. |
| 411 | * Implemented modem status/control that works with the extra signals |
| 412 | * (DTR, DSR, RI,CD) as well. |
| 413 | * 3 different modes supported: |
| 414 | * ser0 on PB (Bundy), ser1 on PB (Lisa) and ser2 on PA (Bundy) |
| 415 | * Fixed DEF_TX value that caused the serial transmitter pin (txd) to go to 0 when |
| 416 | * closing the last filehandle, NASTY!. |
| 417 | * Added break generation, not tested though! |
Thomas Gleixner | 40663cc | 2006-07-01 19:29:43 -0700 | [diff] [blame] | 418 | * Use IRQF_SHARED when request_irq() for ser2 and ser3 (shared with) par0 and par1. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | * You can't use them at the same time (yet..), but you can hopefully switch |
| 420 | * between ser2/par0, ser3/par1 with the same kernel config. |
| 421 | * Replaced some magic constants with defines |
| 422 | * |
| 423 | * |
| 424 | */ |
| 425 | |
| 426 | static char *serial_version = "$Revision: 1.25 $"; |
| 427 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | #include <linux/types.h> |
| 429 | #include <linux/errno.h> |
| 430 | #include <linux/signal.h> |
| 431 | #include <linux/sched.h> |
| 432 | #include <linux/timer.h> |
| 433 | #include <linux/interrupt.h> |
| 434 | #include <linux/tty.h> |
| 435 | #include <linux/tty_flip.h> |
| 436 | #include <linux/major.h> |
| 437 | #include <linux/string.h> |
| 438 | #include <linux/fcntl.h> |
| 439 | #include <linux/mm.h> |
| 440 | #include <linux/slab.h> |
| 441 | #include <linux/init.h> |
| 442 | #include <asm/uaccess.h> |
| 443 | #include <linux/kernel.h> |
Arjan van de Ven | f392ecf | 2006-01-12 18:44:32 +0000 | [diff] [blame] | 444 | #include <linux/mutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | |
| 446 | #include <asm/io.h> |
| 447 | #include <asm/irq.h> |
| 448 | #include <asm/system.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | #include <asm/bitops.h> |
| 450 | #include <linux/delay.h> |
| 451 | |
| 452 | #include <asm/arch/svinto.h> |
| 453 | |
| 454 | /* non-arch dependent serial structures are in linux/serial.h */ |
| 455 | #include <linux/serial.h> |
| 456 | /* while we keep our own stuff (struct e100_serial) in a local .h file */ |
| 457 | #include "serial.h" |
| 458 | #include <asm/fasttimer.h> |
| 459 | |
| 460 | #ifdef CONFIG_ETRAX_SERIAL_FAST_TIMER |
| 461 | #ifndef CONFIG_ETRAX_FAST_TIMER |
| 462 | #error "Enable FAST_TIMER to use SERIAL_FAST_TIMER" |
| 463 | #endif |
| 464 | #endif |
| 465 | |
| 466 | #if defined(CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS) && \ |
| 467 | (CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS == 0) |
| 468 | #error "RX_TIMEOUT_TICKS == 0 not allowed, use 1" |
| 469 | #endif |
| 470 | |
| 471 | #if defined(CONFIG_ETRAX_RS485_ON_PA) && defined(CONFIG_ETRAX_RS485_ON_PORT_G) |
| 472 | #error "Disable either CONFIG_ETRAX_RS485_ON_PA or CONFIG_ETRAX_RS485_ON_PORT_G" |
| 473 | #endif |
| 474 | |
| 475 | /* |
| 476 | * All of the compatibilty code so we can compile serial.c against |
| 477 | * older kernels is hidden in serial_compat.h |
| 478 | */ |
| 479 | #if defined(LOCAL_HEADERS) |
| 480 | #include "serial_compat.h" |
| 481 | #endif |
| 482 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | struct tty_driver *serial_driver; |
| 484 | |
| 485 | /* serial subtype definitions */ |
| 486 | #ifndef SERIAL_TYPE_NORMAL |
| 487 | #define SERIAL_TYPE_NORMAL 1 |
| 488 | #endif |
| 489 | |
| 490 | /* number of characters left in xmit buffer before we ask for more */ |
| 491 | #define WAKEUP_CHARS 256 |
| 492 | |
| 493 | //#define SERIAL_DEBUG_INTR |
| 494 | //#define SERIAL_DEBUG_OPEN |
| 495 | //#define SERIAL_DEBUG_FLOW |
| 496 | //#define SERIAL_DEBUG_DATA |
| 497 | //#define SERIAL_DEBUG_THROTTLE |
| 498 | //#define SERIAL_DEBUG_IO /* Debug for Extra control and status pins */ |
| 499 | //#define SERIAL_DEBUG_LINE 0 /* What serport we want to debug */ |
| 500 | |
| 501 | /* Enable this to use serial interrupts to handle when you |
| 502 | expect the first received event on the serial port to |
| 503 | be an error, break or similar. Used to be able to flash IRMA |
| 504 | from eLinux */ |
| 505 | #define SERIAL_HANDLE_EARLY_ERRORS |
| 506 | |
| 507 | /* Defined and used in n_tty.c, but we need it here as well */ |
| 508 | #define TTY_THRESHOLD_THROTTLE 128 |
| 509 | |
| 510 | /* Due to buffersizes and threshold values, our SERIAL_DESCR_BUF_SIZE |
| 511 | * must not be to high or flow control won't work if we leave it to the tty |
| 512 | * layer so we have our own throttling in flush_to_flip |
| 513 | * TTY_FLIPBUF_SIZE=512, |
| 514 | * TTY_THRESHOLD_THROTTLE/UNTHROTTLE=128 |
| 515 | * BUF_SIZE can't be > 128 |
| 516 | */ |
| 517 | /* Currently 16 descriptors x 128 bytes = 2048 bytes */ |
| 518 | #define SERIAL_DESCR_BUF_SIZE 256 |
| 519 | |
| 520 | #define SERIAL_PRESCALE_BASE 3125000 /* 3.125MHz */ |
| 521 | #define DEF_BAUD_BASE SERIAL_PRESCALE_BASE |
| 522 | |
| 523 | /* We don't want to load the system with massive fast timer interrupt |
| 524 | * on high baudrates so limit it to 250 us (4kHz) */ |
| 525 | #define MIN_FLUSH_TIME_USEC 250 |
| 526 | |
| 527 | /* Add an x here to log a lot of timer stuff */ |
| 528 | #define TIMERD(x) |
| 529 | /* Debug details of interrupt handling */ |
| 530 | #define DINTR1(x) /* irq on/off, errors */ |
| 531 | #define DINTR2(x) /* tx and rx */ |
| 532 | /* Debug flip buffer stuff */ |
| 533 | #define DFLIP(x) |
| 534 | /* Debug flow control and overview of data flow */ |
| 535 | #define DFLOW(x) |
| 536 | #define DBAUD(x) |
| 537 | #define DLOG_INT_TRIG(x) |
| 538 | |
| 539 | //#define DEBUG_LOG_INCLUDED |
| 540 | #ifndef DEBUG_LOG_INCLUDED |
| 541 | #define DEBUG_LOG(line, string, value) |
| 542 | #else |
| 543 | struct debug_log_info |
| 544 | { |
| 545 | unsigned long time; |
| 546 | unsigned long timer_data; |
| 547 | // int line; |
| 548 | const char *string; |
| 549 | int value; |
| 550 | }; |
| 551 | #define DEBUG_LOG_SIZE 4096 |
| 552 | |
| 553 | struct debug_log_info debug_log[DEBUG_LOG_SIZE]; |
| 554 | int debug_log_pos = 0; |
| 555 | |
| 556 | #define DEBUG_LOG(_line, _string, _value) do { \ |
| 557 | if ((_line) == SERIAL_DEBUG_LINE) {\ |
| 558 | debug_log_func(_line, _string, _value); \ |
| 559 | }\ |
| 560 | }while(0) |
| 561 | |
| 562 | void debug_log_func(int line, const char *string, int value) |
| 563 | { |
| 564 | if (debug_log_pos < DEBUG_LOG_SIZE) { |
| 565 | debug_log[debug_log_pos].time = jiffies; |
| 566 | debug_log[debug_log_pos].timer_data = *R_TIMER_DATA; |
| 567 | // debug_log[debug_log_pos].line = line; |
| 568 | debug_log[debug_log_pos].string = string; |
| 569 | debug_log[debug_log_pos].value = value; |
| 570 | debug_log_pos++; |
| 571 | } |
| 572 | /*printk(string, value);*/ |
| 573 | } |
| 574 | #endif |
| 575 | |
| 576 | #ifndef CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS |
| 577 | /* Default number of timer ticks before flushing rx fifo |
| 578 | * When using "little data, low latency applications: use 0 |
| 579 | * When using "much data applications (PPP)" use ~5 |
| 580 | */ |
| 581 | #define CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS 5 |
| 582 | #endif |
| 583 | |
| 584 | unsigned long timer_data_to_ns(unsigned long timer_data); |
| 585 | |
| 586 | static void change_speed(struct e100_serial *info); |
| 587 | static void rs_throttle(struct tty_struct * tty); |
| 588 | static void rs_wait_until_sent(struct tty_struct *tty, int timeout); |
| 589 | static int rs_write(struct tty_struct * tty, int from_user, |
| 590 | const unsigned char *buf, int count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | #ifdef CONFIG_ETRAX_RS485 |
| 592 | static int e100_write_rs485(struct tty_struct * tty, int from_user, |
| 593 | const unsigned char *buf, int count); |
| 594 | #endif |
| 595 | static int get_lsr_info(struct e100_serial * info, unsigned int *value); |
| 596 | |
| 597 | |
| 598 | #define DEF_BAUD 115200 /* 115.2 kbit/s */ |
| 599 | #define STD_FLAGS (ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST) |
| 600 | #define DEF_RX 0x20 /* or SERIAL_CTRL_W >> 8 */ |
| 601 | /* Default value of tx_ctrl register: has txd(bit 7)=1 (idle) as default */ |
| 602 | #define DEF_TX 0x80 /* or SERIAL_CTRL_B */ |
| 603 | |
| 604 | /* offsets from R_SERIALx_CTRL */ |
| 605 | |
| 606 | #define REG_DATA 0 |
| 607 | #define REG_DATA_STATUS32 0 /* this is the 32 bit register R_SERIALx_READ */ |
| 608 | #define REG_TR_DATA 0 |
| 609 | #define REG_STATUS 1 |
| 610 | #define REG_TR_CTRL 1 |
| 611 | #define REG_REC_CTRL 2 |
| 612 | #define REG_BAUD 3 |
| 613 | #define REG_XOFF 4 /* this is a 32 bit register */ |
| 614 | |
| 615 | /* The bitfields are the same for all serial ports */ |
| 616 | #define SER_RXD_MASK IO_MASK(R_SERIAL0_STATUS, rxd) |
| 617 | #define SER_DATA_AVAIL_MASK IO_MASK(R_SERIAL0_STATUS, data_avail) |
| 618 | #define SER_FRAMING_ERR_MASK IO_MASK(R_SERIAL0_STATUS, framing_err) |
| 619 | #define SER_PAR_ERR_MASK IO_MASK(R_SERIAL0_STATUS, par_err) |
| 620 | #define SER_OVERRUN_MASK IO_MASK(R_SERIAL0_STATUS, overrun) |
| 621 | |
| 622 | #define SER_ERROR_MASK (SER_OVERRUN_MASK | SER_PAR_ERR_MASK | SER_FRAMING_ERR_MASK) |
| 623 | |
| 624 | /* Values for info->errorcode */ |
| 625 | #define ERRCODE_SET_BREAK (TTY_BREAK) |
| 626 | #define ERRCODE_INSERT 0x100 |
| 627 | #define ERRCODE_INSERT_BREAK (ERRCODE_INSERT | TTY_BREAK) |
| 628 | |
| 629 | #define FORCE_EOP(info) *R_SET_EOP = 1U << info->iseteop; |
| 630 | |
| 631 | /* |
| 632 | * General note regarding the use of IO_* macros in this file: |
| 633 | * |
| 634 | * We will use the bits defined for DMA channel 6 when using various |
| 635 | * IO_* macros (e.g. IO_STATE, IO_MASK, IO_EXTRACT) and _assume_ they are |
| 636 | * the same for all channels (which of course they are). |
| 637 | * |
| 638 | * We will also use the bits defined for serial port 0 when writing commands |
| 639 | * to the different ports, as these bits too are the same for all ports. |
| 640 | */ |
| 641 | |
| 642 | |
| 643 | /* Mask for the irqs possibly enabled in R_IRQ_MASK1_RD etc. */ |
| 644 | static const unsigned long e100_ser_int_mask = 0 |
| 645 | #ifdef CONFIG_ETRAX_SERIAL_PORT0 |
| 646 | | IO_MASK(R_IRQ_MASK1_RD, ser0_data) | IO_MASK(R_IRQ_MASK1_RD, ser0_ready) |
| 647 | #endif |
| 648 | #ifdef CONFIG_ETRAX_SERIAL_PORT1 |
| 649 | | IO_MASK(R_IRQ_MASK1_RD, ser1_data) | IO_MASK(R_IRQ_MASK1_RD, ser1_ready) |
| 650 | #endif |
| 651 | #ifdef CONFIG_ETRAX_SERIAL_PORT2 |
| 652 | | IO_MASK(R_IRQ_MASK1_RD, ser2_data) | IO_MASK(R_IRQ_MASK1_RD, ser2_ready) |
| 653 | #endif |
| 654 | #ifdef CONFIG_ETRAX_SERIAL_PORT3 |
| 655 | | IO_MASK(R_IRQ_MASK1_RD, ser3_data) | IO_MASK(R_IRQ_MASK1_RD, ser3_ready) |
| 656 | #endif |
| 657 | ; |
| 658 | unsigned long r_alt_ser_baudrate_shadow = 0; |
| 659 | |
| 660 | /* this is the data for the four serial ports in the etrax100 */ |
| 661 | /* DMA2(ser2), DMA4(ser3), DMA6(ser0) or DMA8(ser1) */ |
| 662 | /* R_DMA_CHx_CLR_INTR, R_DMA_CHx_FIRST, R_DMA_CHx_CMD */ |
| 663 | |
| 664 | static struct e100_serial rs_table[] = { |
| 665 | { .baud = DEF_BAUD, |
| 666 | .port = (unsigned char *)R_SERIAL0_CTRL, |
| 667 | .irq = 1U << 12, /* uses DMA 6 and 7 */ |
| 668 | .oclrintradr = R_DMA_CH6_CLR_INTR, |
| 669 | .ofirstadr = R_DMA_CH6_FIRST, |
| 670 | .ocmdadr = R_DMA_CH6_CMD, |
| 671 | .ostatusadr = R_DMA_CH6_STATUS, |
| 672 | .iclrintradr = R_DMA_CH7_CLR_INTR, |
| 673 | .ifirstadr = R_DMA_CH7_FIRST, |
| 674 | .icmdadr = R_DMA_CH7_CMD, |
| 675 | .idescradr = R_DMA_CH7_DESCR, |
| 676 | .flags = STD_FLAGS, |
| 677 | .rx_ctrl = DEF_RX, |
| 678 | .tx_ctrl = DEF_TX, |
| 679 | .iseteop = 2, |
| 680 | #ifdef CONFIG_ETRAX_SERIAL_PORT0 |
| 681 | .enabled = 1, |
| 682 | #ifdef CONFIG_ETRAX_SERIAL_PORT0_DMA6_OUT |
| 683 | .dma_out_enabled = 1, |
| 684 | #else |
| 685 | .dma_out_enabled = 0, |
| 686 | #endif |
| 687 | #ifdef CONFIG_ETRAX_SERIAL_PORT0_DMA7_IN |
| 688 | .dma_in_enabled = 1, |
| 689 | #else |
| 690 | .dma_in_enabled = 0 |
| 691 | #endif |
| 692 | #else |
| 693 | .enabled = 0, |
| 694 | .dma_out_enabled = 0, |
| 695 | .dma_in_enabled = 0 |
| 696 | #endif |
| 697 | |
| 698 | }, /* ttyS0 */ |
| 699 | #ifndef CONFIG_SVINTO_SIM |
| 700 | { .baud = DEF_BAUD, |
| 701 | .port = (unsigned char *)R_SERIAL1_CTRL, |
| 702 | .irq = 1U << 16, /* uses DMA 8 and 9 */ |
| 703 | .oclrintradr = R_DMA_CH8_CLR_INTR, |
| 704 | .ofirstadr = R_DMA_CH8_FIRST, |
| 705 | .ocmdadr = R_DMA_CH8_CMD, |
| 706 | .ostatusadr = R_DMA_CH8_STATUS, |
| 707 | .iclrintradr = R_DMA_CH9_CLR_INTR, |
| 708 | .ifirstadr = R_DMA_CH9_FIRST, |
| 709 | .icmdadr = R_DMA_CH9_CMD, |
| 710 | .idescradr = R_DMA_CH9_DESCR, |
| 711 | .flags = STD_FLAGS, |
| 712 | .rx_ctrl = DEF_RX, |
| 713 | .tx_ctrl = DEF_TX, |
| 714 | .iseteop = 3, |
| 715 | #ifdef CONFIG_ETRAX_SERIAL_PORT1 |
| 716 | .enabled = 1, |
| 717 | #ifdef CONFIG_ETRAX_SERIAL_PORT1_DMA8_OUT |
| 718 | .dma_out_enabled = 1, |
| 719 | #else |
| 720 | .dma_out_enabled = 0, |
| 721 | #endif |
| 722 | #ifdef CONFIG_ETRAX_SERIAL_PORT1_DMA9_IN |
| 723 | .dma_in_enabled = 1, |
| 724 | #else |
| 725 | .dma_in_enabled = 0 |
| 726 | #endif |
| 727 | #else |
| 728 | .enabled = 0, |
| 729 | .dma_out_enabled = 0, |
| 730 | .dma_in_enabled = 0 |
| 731 | #endif |
| 732 | }, /* ttyS1 */ |
| 733 | |
| 734 | { .baud = DEF_BAUD, |
| 735 | .port = (unsigned char *)R_SERIAL2_CTRL, |
| 736 | .irq = 1U << 4, /* uses DMA 2 and 3 */ |
| 737 | .oclrintradr = R_DMA_CH2_CLR_INTR, |
| 738 | .ofirstadr = R_DMA_CH2_FIRST, |
| 739 | .ocmdadr = R_DMA_CH2_CMD, |
| 740 | .ostatusadr = R_DMA_CH2_STATUS, |
| 741 | .iclrintradr = R_DMA_CH3_CLR_INTR, |
| 742 | .ifirstadr = R_DMA_CH3_FIRST, |
| 743 | .icmdadr = R_DMA_CH3_CMD, |
| 744 | .idescradr = R_DMA_CH3_DESCR, |
| 745 | .flags = STD_FLAGS, |
| 746 | .rx_ctrl = DEF_RX, |
| 747 | .tx_ctrl = DEF_TX, |
| 748 | .iseteop = 0, |
| 749 | #ifdef CONFIG_ETRAX_SERIAL_PORT2 |
| 750 | .enabled = 1, |
| 751 | #ifdef CONFIG_ETRAX_SERIAL_PORT2_DMA2_OUT |
| 752 | .dma_out_enabled = 1, |
| 753 | #else |
| 754 | .dma_out_enabled = 0, |
| 755 | #endif |
| 756 | #ifdef CONFIG_ETRAX_SERIAL_PORT2_DMA3_IN |
| 757 | .dma_in_enabled = 1, |
| 758 | #else |
| 759 | .dma_in_enabled = 0 |
| 760 | #endif |
| 761 | #else |
| 762 | .enabled = 0, |
| 763 | .dma_out_enabled = 0, |
| 764 | .dma_in_enabled = 0 |
| 765 | #endif |
| 766 | }, /* ttyS2 */ |
| 767 | |
| 768 | { .baud = DEF_BAUD, |
| 769 | .port = (unsigned char *)R_SERIAL3_CTRL, |
| 770 | .irq = 1U << 8, /* uses DMA 4 and 5 */ |
| 771 | .oclrintradr = R_DMA_CH4_CLR_INTR, |
| 772 | .ofirstadr = R_DMA_CH4_FIRST, |
| 773 | .ocmdadr = R_DMA_CH4_CMD, |
| 774 | .ostatusadr = R_DMA_CH4_STATUS, |
| 775 | .iclrintradr = R_DMA_CH5_CLR_INTR, |
| 776 | .ifirstadr = R_DMA_CH5_FIRST, |
| 777 | .icmdadr = R_DMA_CH5_CMD, |
| 778 | .idescradr = R_DMA_CH5_DESCR, |
| 779 | .flags = STD_FLAGS, |
| 780 | .rx_ctrl = DEF_RX, |
| 781 | .tx_ctrl = DEF_TX, |
| 782 | .iseteop = 1, |
| 783 | #ifdef CONFIG_ETRAX_SERIAL_PORT3 |
| 784 | .enabled = 1, |
| 785 | #ifdef CONFIG_ETRAX_SERIAL_PORT3_DMA4_OUT |
| 786 | .dma_out_enabled = 1, |
| 787 | #else |
| 788 | .dma_out_enabled = 0, |
| 789 | #endif |
| 790 | #ifdef CONFIG_ETRAX_SERIAL_PORT3_DMA5_IN |
| 791 | .dma_in_enabled = 1, |
| 792 | #else |
| 793 | .dma_in_enabled = 0 |
| 794 | #endif |
| 795 | #else |
| 796 | .enabled = 0, |
| 797 | .dma_out_enabled = 0, |
| 798 | .dma_in_enabled = 0 |
| 799 | #endif |
| 800 | } /* ttyS3 */ |
| 801 | #endif |
| 802 | }; |
| 803 | |
| 804 | |
| 805 | #define NR_PORTS (sizeof(rs_table)/sizeof(struct e100_serial)) |
| 806 | |
| 807 | static struct termios *serial_termios[NR_PORTS]; |
| 808 | static struct termios *serial_termios_locked[NR_PORTS]; |
| 809 | #ifdef CONFIG_ETRAX_SERIAL_FAST_TIMER |
| 810 | static struct fast_timer fast_timers[NR_PORTS]; |
| 811 | #endif |
| 812 | |
| 813 | #ifdef CONFIG_ETRAX_SERIAL_PROC_ENTRY |
| 814 | #define PROCSTAT(x) x |
| 815 | struct ser_statistics_type { |
| 816 | int overrun_cnt; |
| 817 | int early_errors_cnt; |
| 818 | int ser_ints_ok_cnt; |
| 819 | int errors_cnt; |
| 820 | unsigned long int processing_flip; |
| 821 | unsigned long processing_flip_still_room; |
| 822 | unsigned long int timeout_flush_cnt; |
| 823 | int rx_dma_ints; |
| 824 | int tx_dma_ints; |
| 825 | int rx_tot; |
| 826 | int tx_tot; |
| 827 | }; |
| 828 | |
| 829 | static struct ser_statistics_type ser_stat[NR_PORTS]; |
| 830 | |
| 831 | #else |
| 832 | |
| 833 | #define PROCSTAT(x) |
| 834 | |
| 835 | #endif /* CONFIG_ETRAX_SERIAL_PROC_ENTRY */ |
| 836 | |
| 837 | /* RS-485 */ |
| 838 | #if defined(CONFIG_ETRAX_RS485) |
| 839 | #ifdef CONFIG_ETRAX_FAST_TIMER |
| 840 | static struct fast_timer fast_timers_rs485[NR_PORTS]; |
| 841 | #endif |
| 842 | #if defined(CONFIG_ETRAX_RS485_ON_PA) |
| 843 | static int rs485_pa_bit = CONFIG_ETRAX_RS485_ON_PA_BIT; |
| 844 | #endif |
| 845 | #if defined(CONFIG_ETRAX_RS485_ON_PORT_G) |
| 846 | static int rs485_port_g_bit = CONFIG_ETRAX_RS485_ON_PORT_G_BIT; |
| 847 | #endif |
| 848 | #endif |
| 849 | |
| 850 | /* Info and macros needed for each ports extra control/status signals. */ |
| 851 | #define E100_STRUCT_PORT(line, pinname) \ |
| 852 | ((CONFIG_ETRAX_SER##line##_##pinname##_ON_PA_BIT >= 0)? \ |
| 853 | (R_PORT_PA_DATA): ( \ |
| 854 | (CONFIG_ETRAX_SER##line##_##pinname##_ON_PB_BIT >= 0)? \ |
| 855 | (R_PORT_PB_DATA):&dummy_ser[line])) |
| 856 | |
| 857 | #define E100_STRUCT_SHADOW(line, pinname) \ |
| 858 | ((CONFIG_ETRAX_SER##line##_##pinname##_ON_PA_BIT >= 0)? \ |
| 859 | (&port_pa_data_shadow): ( \ |
| 860 | (CONFIG_ETRAX_SER##line##_##pinname##_ON_PB_BIT >= 0)? \ |
| 861 | (&port_pb_data_shadow):&dummy_ser[line])) |
| 862 | #define E100_STRUCT_MASK(line, pinname) \ |
| 863 | ((CONFIG_ETRAX_SER##line##_##pinname##_ON_PA_BIT >= 0)? \ |
| 864 | (1<<CONFIG_ETRAX_SER##line##_##pinname##_ON_PA_BIT): ( \ |
| 865 | (CONFIG_ETRAX_SER##line##_##pinname##_ON_PB_BIT >= 0)? \ |
| 866 | (1<<CONFIG_ETRAX_SER##line##_##pinname##_ON_PB_BIT):DUMMY_##pinname##_MASK)) |
| 867 | |
| 868 | #define DUMMY_DTR_MASK 1 |
| 869 | #define DUMMY_RI_MASK 2 |
| 870 | #define DUMMY_DSR_MASK 4 |
| 871 | #define DUMMY_CD_MASK 8 |
| 872 | static unsigned char dummy_ser[NR_PORTS] = {0xFF, 0xFF, 0xFF,0xFF}; |
| 873 | |
| 874 | /* If not all status pins are used or disabled, use mixed mode */ |
| 875 | #ifdef CONFIG_ETRAX_SERIAL_PORT0 |
| 876 | |
| 877 | #define SER0_PA_BITSUM (CONFIG_ETRAX_SER0_DTR_ON_PA_BIT+CONFIG_ETRAX_SER0_RI_ON_PA_BIT+CONFIG_ETRAX_SER0_DSR_ON_PA_BIT+CONFIG_ETRAX_SER0_CD_ON_PA_BIT) |
| 878 | |
| 879 | #if SER0_PA_BITSUM != -4 |
| 880 | # if CONFIG_ETRAX_SER0_DTR_ON_PA_BIT == -1 |
| 881 | # ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED |
| 882 | # define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1 |
| 883 | # endif |
| 884 | # endif |
| 885 | # if CONFIG_ETRAX_SER0_RI_ON_PA_BIT == -1 |
| 886 | # ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED |
| 887 | # define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1 |
| 888 | # endif |
| 889 | # endif |
| 890 | # if CONFIG_ETRAX_SER0_DSR_ON_PA_BIT == -1 |
| 891 | # ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED |
| 892 | # define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1 |
| 893 | # endif |
| 894 | # endif |
| 895 | # if CONFIG_ETRAX_SER0_CD_ON_PA_BIT == -1 |
| 896 | # ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED |
| 897 | # define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1 |
| 898 | # endif |
| 899 | # endif |
| 900 | #endif |
| 901 | |
| 902 | #define SER0_PB_BITSUM (CONFIG_ETRAX_SER0_DTR_ON_PB_BIT+CONFIG_ETRAX_SER0_RI_ON_PB_BIT+CONFIG_ETRAX_SER0_DSR_ON_PB_BIT+CONFIG_ETRAX_SER0_CD_ON_PB_BIT) |
| 903 | |
| 904 | #if SER0_PB_BITSUM != -4 |
| 905 | # if CONFIG_ETRAX_SER0_DTR_ON_PB_BIT == -1 |
| 906 | # ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED |
| 907 | # define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1 |
| 908 | # endif |
| 909 | # endif |
| 910 | # if CONFIG_ETRAX_SER0_RI_ON_PB_BIT == -1 |
| 911 | # ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED |
| 912 | # define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1 |
| 913 | # endif |
| 914 | # endif |
| 915 | # if CONFIG_ETRAX_SER0_DSR_ON_PB_BIT == -1 |
| 916 | # ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED |
| 917 | # define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1 |
| 918 | # endif |
| 919 | # endif |
| 920 | # if CONFIG_ETRAX_SER0_CD_ON_PB_BIT == -1 |
| 921 | # ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED |
| 922 | # define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1 |
| 923 | # endif |
| 924 | # endif |
| 925 | #endif |
| 926 | |
| 927 | #endif /* PORT0 */ |
| 928 | |
| 929 | |
| 930 | #ifdef CONFIG_ETRAX_SERIAL_PORT1 |
| 931 | |
| 932 | #define SER1_PA_BITSUM (CONFIG_ETRAX_SER1_DTR_ON_PA_BIT+CONFIG_ETRAX_SER1_RI_ON_PA_BIT+CONFIG_ETRAX_SER1_DSR_ON_PA_BIT+CONFIG_ETRAX_SER1_CD_ON_PA_BIT) |
| 933 | |
| 934 | #if SER1_PA_BITSUM != -4 |
| 935 | # if CONFIG_ETRAX_SER1_DTR_ON_PA_BIT == -1 |
| 936 | # ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED |
| 937 | # define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1 |
| 938 | # endif |
| 939 | # endif |
| 940 | # if CONFIG_ETRAX_SER1_RI_ON_PA_BIT == -1 |
| 941 | # ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED |
| 942 | # define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1 |
| 943 | # endif |
| 944 | # endif |
| 945 | # if CONFIG_ETRAX_SER1_DSR_ON_PA_BIT == -1 |
| 946 | # ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED |
| 947 | # define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1 |
| 948 | # endif |
| 949 | # endif |
| 950 | # if CONFIG_ETRAX_SER1_CD_ON_PA_BIT == -1 |
| 951 | # ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED |
| 952 | # define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1 |
| 953 | # endif |
| 954 | # endif |
| 955 | #endif |
| 956 | |
| 957 | #define SER1_PB_BITSUM (CONFIG_ETRAX_SER1_DTR_ON_PB_BIT+CONFIG_ETRAX_SER1_RI_ON_PB_BIT+CONFIG_ETRAX_SER1_DSR_ON_PB_BIT+CONFIG_ETRAX_SER1_CD_ON_PB_BIT) |
| 958 | |
| 959 | #if SER1_PB_BITSUM != -4 |
| 960 | # if CONFIG_ETRAX_SER1_DTR_ON_PB_BIT == -1 |
| 961 | # ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED |
| 962 | # define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1 |
| 963 | # endif |
| 964 | # endif |
| 965 | # if CONFIG_ETRAX_SER1_RI_ON_PB_BIT == -1 |
| 966 | # ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED |
| 967 | # define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1 |
| 968 | # endif |
| 969 | # endif |
| 970 | # if CONFIG_ETRAX_SER1_DSR_ON_PB_BIT == -1 |
| 971 | # ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED |
| 972 | # define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1 |
| 973 | # endif |
| 974 | # endif |
| 975 | # if CONFIG_ETRAX_SER1_CD_ON_PB_BIT == -1 |
| 976 | # ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED |
| 977 | # define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1 |
| 978 | # endif |
| 979 | # endif |
| 980 | #endif |
| 981 | |
| 982 | #endif /* PORT1 */ |
| 983 | |
| 984 | #ifdef CONFIG_ETRAX_SERIAL_PORT2 |
| 985 | |
| 986 | #define SER2_PA_BITSUM (CONFIG_ETRAX_SER2_DTR_ON_PA_BIT+CONFIG_ETRAX_SER2_RI_ON_PA_BIT+CONFIG_ETRAX_SER2_DSR_ON_PA_BIT+CONFIG_ETRAX_SER2_CD_ON_PA_BIT) |
| 987 | |
| 988 | #if SER2_PA_BITSUM != -4 |
| 989 | # if CONFIG_ETRAX_SER2_DTR_ON_PA_BIT == -1 |
| 990 | # ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED |
| 991 | # define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1 |
| 992 | # endif |
| 993 | # endif |
| 994 | # if CONFIG_ETRAX_SER2_RI_ON_PA_BIT == -1 |
| 995 | # ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED |
| 996 | # define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1 |
| 997 | # endif |
| 998 | # endif |
| 999 | # if CONFIG_ETRAX_SER2_DSR_ON_PA_BIT == -1 |
| 1000 | # ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED |
| 1001 | # define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1 |
| 1002 | # endif |
| 1003 | # endif |
| 1004 | # if CONFIG_ETRAX_SER2_CD_ON_PA_BIT == -1 |
| 1005 | # ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED |
| 1006 | # define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1 |
| 1007 | # endif |
| 1008 | # endif |
| 1009 | #endif |
| 1010 | |
| 1011 | #define SER2_PB_BITSUM (CONFIG_ETRAX_SER2_DTR_ON_PB_BIT+CONFIG_ETRAX_SER2_RI_ON_PB_BIT+CONFIG_ETRAX_SER2_DSR_ON_PB_BIT+CONFIG_ETRAX_SER2_CD_ON_PB_BIT) |
| 1012 | |
| 1013 | #if SER2_PB_BITSUM != -4 |
| 1014 | # if CONFIG_ETRAX_SER2_DTR_ON_PB_BIT == -1 |
| 1015 | # ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED |
| 1016 | # define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1 |
| 1017 | # endif |
| 1018 | # endif |
| 1019 | # if CONFIG_ETRAX_SER2_RI_ON_PB_BIT == -1 |
| 1020 | # ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED |
| 1021 | # define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1 |
| 1022 | # endif |
| 1023 | # endif |
| 1024 | # if CONFIG_ETRAX_SER2_DSR_ON_PB_BIT == -1 |
| 1025 | # ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED |
| 1026 | # define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1 |
| 1027 | # endif |
| 1028 | # endif |
| 1029 | # if CONFIG_ETRAX_SER2_CD_ON_PB_BIT == -1 |
| 1030 | # ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED |
| 1031 | # define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1 |
| 1032 | # endif |
| 1033 | # endif |
| 1034 | #endif |
| 1035 | |
| 1036 | #endif /* PORT2 */ |
| 1037 | |
| 1038 | #ifdef CONFIG_ETRAX_SERIAL_PORT3 |
| 1039 | |
| 1040 | #define SER3_PA_BITSUM (CONFIG_ETRAX_SER3_DTR_ON_PA_BIT+CONFIG_ETRAX_SER3_RI_ON_PA_BIT+CONFIG_ETRAX_SER3_DSR_ON_PA_BIT+CONFIG_ETRAX_SER3_CD_ON_PA_BIT) |
| 1041 | |
| 1042 | #if SER3_PA_BITSUM != -4 |
| 1043 | # if CONFIG_ETRAX_SER3_DTR_ON_PA_BIT == -1 |
| 1044 | # ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED |
| 1045 | # define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1 |
| 1046 | # endif |
| 1047 | # endif |
| 1048 | # if CONFIG_ETRAX_SER3_RI_ON_PA_BIT == -1 |
| 1049 | # ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED |
| 1050 | # define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1 |
| 1051 | # endif |
| 1052 | # endif |
| 1053 | # if CONFIG_ETRAX_SER3_DSR_ON_PA_BIT == -1 |
| 1054 | # ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED |
| 1055 | # define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1 |
| 1056 | # endif |
| 1057 | # endif |
| 1058 | # if CONFIG_ETRAX_SER3_CD_ON_PA_BIT == -1 |
| 1059 | # ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED |
| 1060 | # define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1 |
| 1061 | # endif |
| 1062 | # endif |
| 1063 | #endif |
| 1064 | |
| 1065 | #define SER3_PB_BITSUM (CONFIG_ETRAX_SER3_DTR_ON_PB_BIT+CONFIG_ETRAX_SER3_RI_ON_PB_BIT+CONFIG_ETRAX_SER3_DSR_ON_PB_BIT+CONFIG_ETRAX_SER3_CD_ON_PB_BIT) |
| 1066 | |
| 1067 | #if SER3_PB_BITSUM != -4 |
| 1068 | # if CONFIG_ETRAX_SER3_DTR_ON_PB_BIT == -1 |
| 1069 | # ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED |
| 1070 | # define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1 |
| 1071 | # endif |
| 1072 | # endif |
| 1073 | # if CONFIG_ETRAX_SER3_RI_ON_PB_BIT == -1 |
| 1074 | # ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED |
| 1075 | # define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1 |
| 1076 | # endif |
| 1077 | # endif |
| 1078 | # if CONFIG_ETRAX_SER3_DSR_ON_PB_BIT == -1 |
| 1079 | # ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED |
| 1080 | # define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1 |
| 1081 | # endif |
| 1082 | # endif |
| 1083 | # if CONFIG_ETRAX_SER3_CD_ON_PB_BIT == -1 |
| 1084 | # ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED |
| 1085 | # define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1 |
| 1086 | # endif |
| 1087 | # endif |
| 1088 | #endif |
| 1089 | |
| 1090 | #endif /* PORT3 */ |
| 1091 | |
| 1092 | |
| 1093 | #if defined(CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED) || \ |
| 1094 | defined(CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED) || \ |
| 1095 | defined(CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED) || \ |
| 1096 | defined(CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED) |
| 1097 | #define CONFIG_ETRAX_SERX_DTR_RI_DSR_CD_MIXED |
| 1098 | #endif |
| 1099 | |
| 1100 | #ifdef CONFIG_ETRAX_SERX_DTR_RI_DSR_CD_MIXED |
| 1101 | /* The pins can be mixed on PA and PB */ |
| 1102 | #define CONTROL_PINS_PORT_NOT_USED(line) \ |
| 1103 | &dummy_ser[line], &dummy_ser[line], \ |
| 1104 | &dummy_ser[line], &dummy_ser[line], \ |
| 1105 | &dummy_ser[line], &dummy_ser[line], \ |
| 1106 | &dummy_ser[line], &dummy_ser[line], \ |
| 1107 | DUMMY_DTR_MASK, DUMMY_RI_MASK, DUMMY_DSR_MASK, DUMMY_CD_MASK |
| 1108 | |
| 1109 | |
| 1110 | struct control_pins |
| 1111 | { |
| 1112 | volatile unsigned char *dtr_port; |
| 1113 | unsigned char *dtr_shadow; |
| 1114 | volatile unsigned char *ri_port; |
| 1115 | unsigned char *ri_shadow; |
| 1116 | volatile unsigned char *dsr_port; |
| 1117 | unsigned char *dsr_shadow; |
| 1118 | volatile unsigned char *cd_port; |
| 1119 | unsigned char *cd_shadow; |
| 1120 | |
| 1121 | unsigned char dtr_mask; |
| 1122 | unsigned char ri_mask; |
| 1123 | unsigned char dsr_mask; |
| 1124 | unsigned char cd_mask; |
| 1125 | }; |
| 1126 | |
| 1127 | static const struct control_pins e100_modem_pins[NR_PORTS] = |
| 1128 | { |
| 1129 | /* Ser 0 */ |
| 1130 | { |
| 1131 | #ifdef CONFIG_ETRAX_SERIAL_PORT0 |
| 1132 | E100_STRUCT_PORT(0,DTR), E100_STRUCT_SHADOW(0,DTR), |
| 1133 | E100_STRUCT_PORT(0,RI), E100_STRUCT_SHADOW(0,RI), |
| 1134 | E100_STRUCT_PORT(0,DSR), E100_STRUCT_SHADOW(0,DSR), |
| 1135 | E100_STRUCT_PORT(0,CD), E100_STRUCT_SHADOW(0,CD), |
| 1136 | E100_STRUCT_MASK(0,DTR), |
| 1137 | E100_STRUCT_MASK(0,RI), |
| 1138 | E100_STRUCT_MASK(0,DSR), |
| 1139 | E100_STRUCT_MASK(0,CD) |
| 1140 | #else |
| 1141 | CONTROL_PINS_PORT_NOT_USED(0) |
| 1142 | #endif |
| 1143 | }, |
| 1144 | |
| 1145 | /* Ser 1 */ |
| 1146 | { |
| 1147 | #ifdef CONFIG_ETRAX_SERIAL_PORT1 |
| 1148 | E100_STRUCT_PORT(1,DTR), E100_STRUCT_SHADOW(1,DTR), |
| 1149 | E100_STRUCT_PORT(1,RI), E100_STRUCT_SHADOW(1,RI), |
| 1150 | E100_STRUCT_PORT(1,DSR), E100_STRUCT_SHADOW(1,DSR), |
| 1151 | E100_STRUCT_PORT(1,CD), E100_STRUCT_SHADOW(1,CD), |
| 1152 | E100_STRUCT_MASK(1,DTR), |
| 1153 | E100_STRUCT_MASK(1,RI), |
| 1154 | E100_STRUCT_MASK(1,DSR), |
| 1155 | E100_STRUCT_MASK(1,CD) |
| 1156 | #else |
| 1157 | CONTROL_PINS_PORT_NOT_USED(1) |
| 1158 | #endif |
| 1159 | }, |
| 1160 | |
| 1161 | /* Ser 2 */ |
| 1162 | { |
| 1163 | #ifdef CONFIG_ETRAX_SERIAL_PORT2 |
| 1164 | E100_STRUCT_PORT(2,DTR), E100_STRUCT_SHADOW(2,DTR), |
| 1165 | E100_STRUCT_PORT(2,RI), E100_STRUCT_SHADOW(2,RI), |
| 1166 | E100_STRUCT_PORT(2,DSR), E100_STRUCT_SHADOW(2,DSR), |
| 1167 | E100_STRUCT_PORT(2,CD), E100_STRUCT_SHADOW(2,CD), |
| 1168 | E100_STRUCT_MASK(2,DTR), |
| 1169 | E100_STRUCT_MASK(2,RI), |
| 1170 | E100_STRUCT_MASK(2,DSR), |
| 1171 | E100_STRUCT_MASK(2,CD) |
| 1172 | #else |
| 1173 | CONTROL_PINS_PORT_NOT_USED(2) |
| 1174 | #endif |
| 1175 | }, |
| 1176 | |
| 1177 | /* Ser 3 */ |
| 1178 | { |
| 1179 | #ifdef CONFIG_ETRAX_SERIAL_PORT3 |
| 1180 | E100_STRUCT_PORT(3,DTR), E100_STRUCT_SHADOW(3,DTR), |
| 1181 | E100_STRUCT_PORT(3,RI), E100_STRUCT_SHADOW(3,RI), |
| 1182 | E100_STRUCT_PORT(3,DSR), E100_STRUCT_SHADOW(3,DSR), |
| 1183 | E100_STRUCT_PORT(3,CD), E100_STRUCT_SHADOW(3,CD), |
| 1184 | E100_STRUCT_MASK(3,DTR), |
| 1185 | E100_STRUCT_MASK(3,RI), |
| 1186 | E100_STRUCT_MASK(3,DSR), |
| 1187 | E100_STRUCT_MASK(3,CD) |
| 1188 | #else |
| 1189 | CONTROL_PINS_PORT_NOT_USED(3) |
| 1190 | #endif |
| 1191 | } |
| 1192 | }; |
| 1193 | #else /* CONFIG_ETRAX_SERX_DTR_RI_DSR_CD_MIXED */ |
| 1194 | |
| 1195 | /* All pins are on either PA or PB for each serial port */ |
| 1196 | #define CONTROL_PINS_PORT_NOT_USED(line) \ |
| 1197 | &dummy_ser[line], &dummy_ser[line], \ |
| 1198 | DUMMY_DTR_MASK, DUMMY_RI_MASK, DUMMY_DSR_MASK, DUMMY_CD_MASK |
| 1199 | |
| 1200 | |
| 1201 | struct control_pins |
| 1202 | { |
| 1203 | volatile unsigned char *port; |
| 1204 | unsigned char *shadow; |
| 1205 | |
| 1206 | unsigned char dtr_mask; |
| 1207 | unsigned char ri_mask; |
| 1208 | unsigned char dsr_mask; |
| 1209 | unsigned char cd_mask; |
| 1210 | }; |
| 1211 | |
| 1212 | #define dtr_port port |
| 1213 | #define dtr_shadow shadow |
| 1214 | #define ri_port port |
| 1215 | #define ri_shadow shadow |
| 1216 | #define dsr_port port |
| 1217 | #define dsr_shadow shadow |
| 1218 | #define cd_port port |
| 1219 | #define cd_shadow shadow |
| 1220 | |
| 1221 | static const struct control_pins e100_modem_pins[NR_PORTS] = |
| 1222 | { |
| 1223 | /* Ser 0 */ |
| 1224 | { |
| 1225 | #ifdef CONFIG_ETRAX_SERIAL_PORT0 |
| 1226 | E100_STRUCT_PORT(0,DTR), E100_STRUCT_SHADOW(0,DTR), |
| 1227 | E100_STRUCT_MASK(0,DTR), |
| 1228 | E100_STRUCT_MASK(0,RI), |
| 1229 | E100_STRUCT_MASK(0,DSR), |
| 1230 | E100_STRUCT_MASK(0,CD) |
| 1231 | #else |
| 1232 | CONTROL_PINS_PORT_NOT_USED(0) |
| 1233 | #endif |
| 1234 | }, |
| 1235 | |
| 1236 | /* Ser 1 */ |
| 1237 | { |
| 1238 | #ifdef CONFIG_ETRAX_SERIAL_PORT1 |
| 1239 | E100_STRUCT_PORT(1,DTR), E100_STRUCT_SHADOW(1,DTR), |
| 1240 | E100_STRUCT_MASK(1,DTR), |
| 1241 | E100_STRUCT_MASK(1,RI), |
| 1242 | E100_STRUCT_MASK(1,DSR), |
| 1243 | E100_STRUCT_MASK(1,CD) |
| 1244 | #else |
| 1245 | CONTROL_PINS_PORT_NOT_USED(1) |
| 1246 | #endif |
| 1247 | }, |
| 1248 | |
| 1249 | /* Ser 2 */ |
| 1250 | { |
| 1251 | #ifdef CONFIG_ETRAX_SERIAL_PORT2 |
| 1252 | E100_STRUCT_PORT(2,DTR), E100_STRUCT_SHADOW(2,DTR), |
| 1253 | E100_STRUCT_MASK(2,DTR), |
| 1254 | E100_STRUCT_MASK(2,RI), |
| 1255 | E100_STRUCT_MASK(2,DSR), |
| 1256 | E100_STRUCT_MASK(2,CD) |
| 1257 | #else |
| 1258 | CONTROL_PINS_PORT_NOT_USED(2) |
| 1259 | #endif |
| 1260 | }, |
| 1261 | |
| 1262 | /* Ser 3 */ |
| 1263 | { |
| 1264 | #ifdef CONFIG_ETRAX_SERIAL_PORT3 |
| 1265 | E100_STRUCT_PORT(3,DTR), E100_STRUCT_SHADOW(3,DTR), |
| 1266 | E100_STRUCT_MASK(3,DTR), |
| 1267 | E100_STRUCT_MASK(3,RI), |
| 1268 | E100_STRUCT_MASK(3,DSR), |
| 1269 | E100_STRUCT_MASK(3,CD) |
| 1270 | #else |
| 1271 | CONTROL_PINS_PORT_NOT_USED(3) |
| 1272 | #endif |
| 1273 | } |
| 1274 | }; |
| 1275 | #endif /* !CONFIG_ETRAX_SERX_DTR_RI_DSR_CD_MIXED */ |
| 1276 | |
| 1277 | #define E100_RTS_MASK 0x20 |
| 1278 | #define E100_CTS_MASK 0x40 |
| 1279 | |
| 1280 | /* All serial port signals are active low: |
| 1281 | * active = 0 -> 3.3V to RS-232 driver -> -12V on RS-232 level |
| 1282 | * inactive = 1 -> 0V to RS-232 driver -> +12V on RS-232 level |
| 1283 | * |
| 1284 | * These macros returns the pin value: 0=0V, >=1 = 3.3V on ETRAX chip |
| 1285 | */ |
| 1286 | |
| 1287 | /* Output */ |
| 1288 | #define E100_RTS_GET(info) ((info)->rx_ctrl & E100_RTS_MASK) |
| 1289 | /* Input */ |
| 1290 | #define E100_CTS_GET(info) ((info)->port[REG_STATUS] & E100_CTS_MASK) |
| 1291 | |
| 1292 | /* These are typically PA or PB and 0 means 0V, 1 means 3.3V */ |
| 1293 | /* Is an output */ |
| 1294 | #define E100_DTR_GET(info) ((*e100_modem_pins[(info)->line].dtr_shadow) & e100_modem_pins[(info)->line].dtr_mask) |
| 1295 | |
| 1296 | /* Normally inputs */ |
| 1297 | #define E100_RI_GET(info) ((*e100_modem_pins[(info)->line].ri_port) & e100_modem_pins[(info)->line].ri_mask) |
| 1298 | #define E100_CD_GET(info) ((*e100_modem_pins[(info)->line].cd_port) & e100_modem_pins[(info)->line].cd_mask) |
| 1299 | |
| 1300 | /* Input */ |
| 1301 | #define E100_DSR_GET(info) ((*e100_modem_pins[(info)->line].dsr_port) & e100_modem_pins[(info)->line].dsr_mask) |
| 1302 | |
| 1303 | |
| 1304 | /* |
| 1305 | * tmp_buf is used as a temporary buffer by serial_write. We need to |
| 1306 | * lock it in case the memcpy_fromfs blocks while swapping in a page, |
| 1307 | * and some other program tries to do a serial write at the same time. |
| 1308 | * Since the lock will only come under contention when the system is |
| 1309 | * swapping and available memory is low, it makes sense to share one |
| 1310 | * buffer across all the serial ports, since it significantly saves |
| 1311 | * memory if large numbers of serial ports are open. |
| 1312 | */ |
| 1313 | static unsigned char *tmp_buf; |
Arjan van de Ven | f392ecf | 2006-01-12 18:44:32 +0000 | [diff] [blame] | 1314 | static DEFINE_MUTEX(tmp_buf_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1315 | |
| 1316 | /* Calculate the chartime depending on baudrate, numbor of bits etc. */ |
| 1317 | static void update_char_time(struct e100_serial * info) |
| 1318 | { |
| 1319 | tcflag_t cflags = info->tty->termios->c_cflag; |
| 1320 | int bits; |
| 1321 | |
| 1322 | /* calc. number of bits / data byte */ |
| 1323 | /* databits + startbit and 1 stopbit */ |
| 1324 | if ((cflags & CSIZE) == CS7) |
| 1325 | bits = 9; |
| 1326 | else |
| 1327 | bits = 10; |
| 1328 | |
| 1329 | if (cflags & CSTOPB) /* 2 stopbits ? */ |
| 1330 | bits++; |
| 1331 | |
| 1332 | if (cflags & PARENB) /* parity bit ? */ |
| 1333 | bits++; |
| 1334 | |
| 1335 | /* calc timeout */ |
| 1336 | info->char_time_usec = ((bits * 1000000) / info->baud) + 1; |
| 1337 | info->flush_time_usec = 4*info->char_time_usec; |
| 1338 | if (info->flush_time_usec < MIN_FLUSH_TIME_USEC) |
| 1339 | info->flush_time_usec = MIN_FLUSH_TIME_USEC; |
| 1340 | |
| 1341 | } |
| 1342 | |
| 1343 | /* |
| 1344 | * This function maps from the Bxxxx defines in asm/termbits.h into real |
| 1345 | * baud rates. |
| 1346 | */ |
| 1347 | |
| 1348 | static int |
| 1349 | cflag_to_baud(unsigned int cflag) |
| 1350 | { |
| 1351 | static int baud_table[] = { |
| 1352 | 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, |
| 1353 | 4800, 9600, 19200, 38400 }; |
| 1354 | |
| 1355 | static int ext_baud_table[] = { |
| 1356 | 0, 57600, 115200, 230400, 460800, 921600, 1843200, 6250000, |
| 1357 | 0, 0, 0, 0, 0, 0, 0, 0 }; |
| 1358 | |
| 1359 | if (cflag & CBAUDEX) |
| 1360 | return ext_baud_table[(cflag & CBAUD) & ~CBAUDEX]; |
| 1361 | else |
| 1362 | return baud_table[cflag & CBAUD]; |
| 1363 | } |
| 1364 | |
| 1365 | /* and this maps to an etrax100 hardware baud constant */ |
| 1366 | |
| 1367 | static unsigned char |
| 1368 | cflag_to_etrax_baud(unsigned int cflag) |
| 1369 | { |
| 1370 | char retval; |
| 1371 | |
| 1372 | static char baud_table[] = { |
| 1373 | -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, -1, 3, 4, 5, 6, 7 }; |
| 1374 | |
| 1375 | static char ext_baud_table[] = { |
| 1376 | -1, 8, 9, 10, 11, 12, 13, 14, -1, -1, -1, -1, -1, -1, -1, -1 }; |
| 1377 | |
| 1378 | if (cflag & CBAUDEX) |
| 1379 | retval = ext_baud_table[(cflag & CBAUD) & ~CBAUDEX]; |
| 1380 | else |
| 1381 | retval = baud_table[cflag & CBAUD]; |
| 1382 | |
| 1383 | if (retval < 0) { |
| 1384 | printk(KERN_WARNING "serdriver tried setting invalid baud rate, flags %x.\n", cflag); |
| 1385 | retval = 5; /* choose default 9600 instead */ |
| 1386 | } |
| 1387 | |
| 1388 | return retval | (retval << 4); /* choose same for both TX and RX */ |
| 1389 | } |
| 1390 | |
| 1391 | |
| 1392 | /* Various static support functions */ |
| 1393 | |
| 1394 | /* Functions to set or clear DTR/RTS on the requested line */ |
| 1395 | /* It is complicated by the fact that RTS is a serial port register, while |
| 1396 | * DTR might not be implemented in the HW at all, and if it is, it can be on |
| 1397 | * any general port. |
| 1398 | */ |
| 1399 | |
| 1400 | |
| 1401 | static inline void |
| 1402 | e100_dtr(struct e100_serial *info, int set) |
| 1403 | { |
| 1404 | #ifndef CONFIG_SVINTO_SIM |
| 1405 | unsigned char mask = e100_modem_pins[info->line].dtr_mask; |
| 1406 | |
| 1407 | #ifdef SERIAL_DEBUG_IO |
| 1408 | printk("ser%i dtr %i mask: 0x%02X\n", info->line, set, mask); |
| 1409 | printk("ser%i shadow before 0x%02X get: %i\n", |
| 1410 | info->line, *e100_modem_pins[info->line].dtr_shadow, |
| 1411 | E100_DTR_GET(info)); |
| 1412 | #endif |
| 1413 | /* DTR is active low */ |
| 1414 | { |
| 1415 | unsigned long flags; |
| 1416 | |
| 1417 | save_flags(flags); |
| 1418 | cli(); |
| 1419 | *e100_modem_pins[info->line].dtr_shadow &= ~mask; |
| 1420 | *e100_modem_pins[info->line].dtr_shadow |= (set ? 0 : mask); |
| 1421 | *e100_modem_pins[info->line].dtr_port = *e100_modem_pins[info->line].dtr_shadow; |
| 1422 | restore_flags(flags); |
| 1423 | } |
| 1424 | |
| 1425 | #ifdef SERIAL_DEBUG_IO |
| 1426 | printk("ser%i shadow after 0x%02X get: %i\n", |
| 1427 | info->line, *e100_modem_pins[info->line].dtr_shadow, |
| 1428 | E100_DTR_GET(info)); |
| 1429 | #endif |
| 1430 | #endif |
| 1431 | } |
| 1432 | |
| 1433 | /* set = 0 means 3.3V on the pin, bitvalue: 0=active, 1=inactive |
| 1434 | * 0=0V , 1=3.3V |
| 1435 | */ |
| 1436 | static inline void |
| 1437 | e100_rts(struct e100_serial *info, int set) |
| 1438 | { |
| 1439 | #ifndef CONFIG_SVINTO_SIM |
| 1440 | unsigned long flags; |
| 1441 | save_flags(flags); |
| 1442 | cli(); |
| 1443 | info->rx_ctrl &= ~E100_RTS_MASK; |
| 1444 | info->rx_ctrl |= (set ? 0 : E100_RTS_MASK); /* RTS is active low */ |
| 1445 | info->port[REG_REC_CTRL] = info->rx_ctrl; |
| 1446 | restore_flags(flags); |
| 1447 | #ifdef SERIAL_DEBUG_IO |
| 1448 | printk("ser%i rts %i\n", info->line, set); |
| 1449 | #endif |
| 1450 | #endif |
| 1451 | } |
| 1452 | |
| 1453 | |
| 1454 | /* If this behaves as a modem, RI and CD is an output */ |
| 1455 | static inline void |
| 1456 | e100_ri_out(struct e100_serial *info, int set) |
| 1457 | { |
| 1458 | #ifndef CONFIG_SVINTO_SIM |
| 1459 | /* RI is active low */ |
| 1460 | { |
| 1461 | unsigned char mask = e100_modem_pins[info->line].ri_mask; |
| 1462 | unsigned long flags; |
| 1463 | |
| 1464 | save_flags(flags); |
| 1465 | cli(); |
| 1466 | *e100_modem_pins[info->line].ri_shadow &= ~mask; |
| 1467 | *e100_modem_pins[info->line].ri_shadow |= (set ? 0 : mask); |
| 1468 | *e100_modem_pins[info->line].ri_port = *e100_modem_pins[info->line].ri_shadow; |
| 1469 | restore_flags(flags); |
| 1470 | } |
| 1471 | #endif |
| 1472 | } |
| 1473 | static inline void |
| 1474 | e100_cd_out(struct e100_serial *info, int set) |
| 1475 | { |
| 1476 | #ifndef CONFIG_SVINTO_SIM |
| 1477 | /* CD is active low */ |
| 1478 | { |
| 1479 | unsigned char mask = e100_modem_pins[info->line].cd_mask; |
| 1480 | unsigned long flags; |
| 1481 | |
| 1482 | save_flags(flags); |
| 1483 | cli(); |
| 1484 | *e100_modem_pins[info->line].cd_shadow &= ~mask; |
| 1485 | *e100_modem_pins[info->line].cd_shadow |= (set ? 0 : mask); |
| 1486 | *e100_modem_pins[info->line].cd_port = *e100_modem_pins[info->line].cd_shadow; |
| 1487 | restore_flags(flags); |
| 1488 | } |
| 1489 | #endif |
| 1490 | } |
| 1491 | |
| 1492 | static inline void |
| 1493 | e100_disable_rx(struct e100_serial *info) |
| 1494 | { |
| 1495 | #ifndef CONFIG_SVINTO_SIM |
| 1496 | /* disable the receiver */ |
| 1497 | info->port[REG_REC_CTRL] = |
| 1498 | (info->rx_ctrl &= ~IO_MASK(R_SERIAL0_REC_CTRL, rec_enable)); |
| 1499 | #endif |
| 1500 | } |
| 1501 | |
| 1502 | static inline void |
| 1503 | e100_enable_rx(struct e100_serial *info) |
| 1504 | { |
| 1505 | #ifndef CONFIG_SVINTO_SIM |
| 1506 | /* enable the receiver */ |
| 1507 | info->port[REG_REC_CTRL] = |
| 1508 | (info->rx_ctrl |= IO_MASK(R_SERIAL0_REC_CTRL, rec_enable)); |
| 1509 | #endif |
| 1510 | } |
| 1511 | |
| 1512 | /* the rx DMA uses both the dma_descr and the dma_eop interrupts */ |
| 1513 | |
| 1514 | static inline void |
| 1515 | e100_disable_rxdma_irq(struct e100_serial *info) |
| 1516 | { |
| 1517 | #ifdef SERIAL_DEBUG_INTR |
| 1518 | printk("rxdma_irq(%d): 0\n",info->line); |
| 1519 | #endif |
| 1520 | DINTR1(DEBUG_LOG(info->line,"IRQ disable_rxdma_irq %i\n", info->line)); |
| 1521 | *R_IRQ_MASK2_CLR = (info->irq << 2) | (info->irq << 3); |
| 1522 | } |
| 1523 | |
| 1524 | static inline void |
| 1525 | e100_enable_rxdma_irq(struct e100_serial *info) |
| 1526 | { |
| 1527 | #ifdef SERIAL_DEBUG_INTR |
| 1528 | printk("rxdma_irq(%d): 1\n",info->line); |
| 1529 | #endif |
| 1530 | DINTR1(DEBUG_LOG(info->line,"IRQ enable_rxdma_irq %i\n", info->line)); |
| 1531 | *R_IRQ_MASK2_SET = (info->irq << 2) | (info->irq << 3); |
| 1532 | } |
| 1533 | |
| 1534 | /* the tx DMA uses only dma_descr interrupt */ |
| 1535 | |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 1536 | static void e100_disable_txdma_irq(struct e100_serial *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1537 | { |
| 1538 | #ifdef SERIAL_DEBUG_INTR |
| 1539 | printk("txdma_irq(%d): 0\n",info->line); |
| 1540 | #endif |
| 1541 | DINTR1(DEBUG_LOG(info->line,"IRQ disable_txdma_irq %i\n", info->line)); |
| 1542 | *R_IRQ_MASK2_CLR = info->irq; |
| 1543 | } |
| 1544 | |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 1545 | static void e100_enable_txdma_irq(struct e100_serial *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1546 | { |
| 1547 | #ifdef SERIAL_DEBUG_INTR |
| 1548 | printk("txdma_irq(%d): 1\n",info->line); |
| 1549 | #endif |
| 1550 | DINTR1(DEBUG_LOG(info->line,"IRQ enable_txdma_irq %i\n", info->line)); |
| 1551 | *R_IRQ_MASK2_SET = info->irq; |
| 1552 | } |
| 1553 | |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 1554 | static void e100_disable_txdma_channel(struct e100_serial *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1555 | { |
| 1556 | unsigned long flags; |
| 1557 | |
| 1558 | /* Disable output DMA channel for the serial port in question |
| 1559 | * ( set to something other then serialX) |
| 1560 | */ |
| 1561 | save_flags(flags); |
| 1562 | cli(); |
| 1563 | DFLOW(DEBUG_LOG(info->line, "disable_txdma_channel %i\n", info->line)); |
| 1564 | if (info->line == 0) { |
| 1565 | if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma6)) == |
| 1566 | IO_STATE(R_GEN_CONFIG, dma6, serial0)) { |
| 1567 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma6); |
| 1568 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma6, unused); |
| 1569 | } |
| 1570 | } else if (info->line == 1) { |
| 1571 | if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma8)) == |
| 1572 | IO_STATE(R_GEN_CONFIG, dma8, serial1)) { |
| 1573 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma8); |
| 1574 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma8, usb); |
| 1575 | } |
| 1576 | } else if (info->line == 2) { |
| 1577 | if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma2)) == |
| 1578 | IO_STATE(R_GEN_CONFIG, dma2, serial2)) { |
| 1579 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma2); |
| 1580 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma2, par0); |
| 1581 | } |
| 1582 | } else if (info->line == 3) { |
| 1583 | if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma4)) == |
| 1584 | IO_STATE(R_GEN_CONFIG, dma4, serial3)) { |
| 1585 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma4); |
| 1586 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma4, par1); |
| 1587 | } |
| 1588 | } |
| 1589 | *R_GEN_CONFIG = genconfig_shadow; |
| 1590 | restore_flags(flags); |
| 1591 | } |
| 1592 | |
| 1593 | |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 1594 | static void e100_enable_txdma_channel(struct e100_serial *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1595 | { |
| 1596 | unsigned long flags; |
| 1597 | |
| 1598 | save_flags(flags); |
| 1599 | cli(); |
| 1600 | DFLOW(DEBUG_LOG(info->line, "enable_txdma_channel %i\n", info->line)); |
| 1601 | /* Enable output DMA channel for the serial port in question */ |
| 1602 | if (info->line == 0) { |
| 1603 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma6); |
| 1604 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma6, serial0); |
| 1605 | } else if (info->line == 1) { |
| 1606 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma8); |
| 1607 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma8, serial1); |
| 1608 | } else if (info->line == 2) { |
| 1609 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma2); |
| 1610 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma2, serial2); |
| 1611 | } else if (info->line == 3) { |
| 1612 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma4); |
| 1613 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma4, serial3); |
| 1614 | } |
| 1615 | *R_GEN_CONFIG = genconfig_shadow; |
| 1616 | restore_flags(flags); |
| 1617 | } |
| 1618 | |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 1619 | static void e100_disable_rxdma_channel(struct e100_serial *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1620 | { |
| 1621 | unsigned long flags; |
| 1622 | |
| 1623 | /* Disable input DMA channel for the serial port in question |
| 1624 | * ( set to something other then serialX) |
| 1625 | */ |
| 1626 | save_flags(flags); |
| 1627 | cli(); |
| 1628 | if (info->line == 0) { |
| 1629 | if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma7)) == |
| 1630 | IO_STATE(R_GEN_CONFIG, dma7, serial0)) { |
| 1631 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma7); |
| 1632 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma7, unused); |
| 1633 | } |
| 1634 | } else if (info->line == 1) { |
| 1635 | if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma9)) == |
| 1636 | IO_STATE(R_GEN_CONFIG, dma9, serial1)) { |
| 1637 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma9); |
| 1638 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma9, usb); |
| 1639 | } |
| 1640 | } else if (info->line == 2) { |
| 1641 | if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma3)) == |
| 1642 | IO_STATE(R_GEN_CONFIG, dma3, serial2)) { |
| 1643 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma3); |
| 1644 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma3, par0); |
| 1645 | } |
| 1646 | } else if (info->line == 3) { |
| 1647 | if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma5)) == |
| 1648 | IO_STATE(R_GEN_CONFIG, dma5, serial3)) { |
| 1649 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma5); |
| 1650 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma5, par1); |
| 1651 | } |
| 1652 | } |
| 1653 | *R_GEN_CONFIG = genconfig_shadow; |
| 1654 | restore_flags(flags); |
| 1655 | } |
| 1656 | |
| 1657 | |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 1658 | static void e100_enable_rxdma_channel(struct e100_serial *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1659 | { |
| 1660 | unsigned long flags; |
| 1661 | |
| 1662 | save_flags(flags); |
| 1663 | cli(); |
| 1664 | /* Enable input DMA channel for the serial port in question */ |
| 1665 | if (info->line == 0) { |
| 1666 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma7); |
| 1667 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma7, serial0); |
| 1668 | } else if (info->line == 1) { |
| 1669 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma9); |
| 1670 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma9, serial1); |
| 1671 | } else if (info->line == 2) { |
| 1672 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma3); |
| 1673 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma3, serial2); |
| 1674 | } else if (info->line == 3) { |
| 1675 | genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma5); |
| 1676 | genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma5, serial3); |
| 1677 | } |
| 1678 | *R_GEN_CONFIG = genconfig_shadow; |
| 1679 | restore_flags(flags); |
| 1680 | } |
| 1681 | |
| 1682 | #ifdef SERIAL_HANDLE_EARLY_ERRORS |
| 1683 | /* in order to detect and fix errors on the first byte |
| 1684 | we have to use the serial interrupts as well. */ |
| 1685 | |
| 1686 | static inline void |
| 1687 | e100_disable_serial_data_irq(struct e100_serial *info) |
| 1688 | { |
| 1689 | #ifdef SERIAL_DEBUG_INTR |
| 1690 | printk("ser_irq(%d): 0\n",info->line); |
| 1691 | #endif |
| 1692 | DINTR1(DEBUG_LOG(info->line,"IRQ disable data_irq %i\n", info->line)); |
| 1693 | *R_IRQ_MASK1_CLR = (1U << (8+2*info->line)); |
| 1694 | } |
| 1695 | |
| 1696 | static inline void |
| 1697 | e100_enable_serial_data_irq(struct e100_serial *info) |
| 1698 | { |
| 1699 | #ifdef SERIAL_DEBUG_INTR |
| 1700 | printk("ser_irq(%d): 1\n",info->line); |
| 1701 | printk("**** %d = %d\n", |
| 1702 | (8+2*info->line), |
| 1703 | (1U << (8+2*info->line))); |
| 1704 | #endif |
| 1705 | DINTR1(DEBUG_LOG(info->line,"IRQ enable data_irq %i\n", info->line)); |
| 1706 | *R_IRQ_MASK1_SET = (1U << (8+2*info->line)); |
| 1707 | } |
| 1708 | #endif |
| 1709 | |
| 1710 | static inline void |
| 1711 | e100_disable_serial_tx_ready_irq(struct e100_serial *info) |
| 1712 | { |
| 1713 | #ifdef SERIAL_DEBUG_INTR |
| 1714 | printk("ser_tx_irq(%d): 0\n",info->line); |
| 1715 | #endif |
| 1716 | DINTR1(DEBUG_LOG(info->line,"IRQ disable ready_irq %i\n", info->line)); |
| 1717 | *R_IRQ_MASK1_CLR = (1U << (8+1+2*info->line)); |
| 1718 | } |
| 1719 | |
| 1720 | static inline void |
| 1721 | e100_enable_serial_tx_ready_irq(struct e100_serial *info) |
| 1722 | { |
| 1723 | #ifdef SERIAL_DEBUG_INTR |
| 1724 | printk("ser_tx_irq(%d): 1\n",info->line); |
| 1725 | printk("**** %d = %d\n", |
| 1726 | (8+1+2*info->line), |
| 1727 | (1U << (8+1+2*info->line))); |
| 1728 | #endif |
| 1729 | DINTR2(DEBUG_LOG(info->line,"IRQ enable ready_irq %i\n", info->line)); |
| 1730 | *R_IRQ_MASK1_SET = (1U << (8+1+2*info->line)); |
| 1731 | } |
| 1732 | |
| 1733 | static inline void e100_enable_rx_irq(struct e100_serial *info) |
| 1734 | { |
| 1735 | if (info->uses_dma_in) |
| 1736 | e100_enable_rxdma_irq(info); |
| 1737 | else |
| 1738 | e100_enable_serial_data_irq(info); |
| 1739 | } |
| 1740 | static inline void e100_disable_rx_irq(struct e100_serial *info) |
| 1741 | { |
| 1742 | if (info->uses_dma_in) |
| 1743 | e100_disable_rxdma_irq(info); |
| 1744 | else |
| 1745 | e100_disable_serial_data_irq(info); |
| 1746 | } |
| 1747 | |
| 1748 | #if defined(CONFIG_ETRAX_RS485) |
| 1749 | /* Enable RS-485 mode on selected port. This is UGLY. */ |
| 1750 | static int |
| 1751 | e100_enable_rs485(struct tty_struct *tty,struct rs485_control *r) |
| 1752 | { |
| 1753 | struct e100_serial * info = (struct e100_serial *)tty->driver_data; |
| 1754 | |
| 1755 | #if defined(CONFIG_ETRAX_RS485_ON_PA) |
| 1756 | *R_PORT_PA_DATA = port_pa_data_shadow |= (1 << rs485_pa_bit); |
| 1757 | #endif |
| 1758 | #if defined(CONFIG_ETRAX_RS485_ON_PORT_G) |
| 1759 | REG_SHADOW_SET(R_PORT_G_DATA, port_g_data_shadow, |
| 1760 | rs485_port_g_bit, 1); |
| 1761 | #endif |
| 1762 | #if defined(CONFIG_ETRAX_RS485_LTC1387) |
| 1763 | REG_SHADOW_SET(R_PORT_G_DATA, port_g_data_shadow, |
| 1764 | CONFIG_ETRAX_RS485_LTC1387_DXEN_PORT_G_BIT, 1); |
| 1765 | REG_SHADOW_SET(R_PORT_G_DATA, port_g_data_shadow, |
| 1766 | CONFIG_ETRAX_RS485_LTC1387_RXEN_PORT_G_BIT, 1); |
| 1767 | #endif |
| 1768 | |
| 1769 | info->rs485.rts_on_send = 0x01 & r->rts_on_send; |
| 1770 | info->rs485.rts_after_sent = 0x01 & r->rts_after_sent; |
| 1771 | if (r->delay_rts_before_send >= 1000) |
| 1772 | info->rs485.delay_rts_before_send = 1000; |
| 1773 | else |
| 1774 | info->rs485.delay_rts_before_send = r->delay_rts_before_send; |
| 1775 | info->rs485.enabled = r->enabled; |
| 1776 | /* printk("rts: on send = %i, after = %i, enabled = %i", |
| 1777 | info->rs485.rts_on_send, |
| 1778 | info->rs485.rts_after_sent, |
| 1779 | info->rs485.enabled |
| 1780 | ); |
| 1781 | */ |
| 1782 | return 0; |
| 1783 | } |
| 1784 | |
| 1785 | static int |
| 1786 | e100_write_rs485(struct tty_struct *tty, int from_user, |
| 1787 | const unsigned char *buf, int count) |
| 1788 | { |
| 1789 | struct e100_serial * info = (struct e100_serial *)tty->driver_data; |
| 1790 | int old_enabled = info->rs485.enabled; |
| 1791 | |
| 1792 | /* rs485 is always implicitly enabled if we're using the ioctl() |
| 1793 | * but it doesn't have to be set in the rs485_control |
| 1794 | * (to be backward compatible with old apps) |
| 1795 | * So we store, set and restore it. |
| 1796 | */ |
| 1797 | info->rs485.enabled = 1; |
| 1798 | /* rs_write now deals with RS485 if enabled */ |
| 1799 | count = rs_write(tty, from_user, buf, count); |
| 1800 | info->rs485.enabled = old_enabled; |
| 1801 | return count; |
| 1802 | } |
| 1803 | |
| 1804 | #ifdef CONFIG_ETRAX_FAST_TIMER |
| 1805 | /* Timer function to toggle RTS when using FAST_TIMER */ |
| 1806 | static void rs485_toggle_rts_timer_function(unsigned long data) |
| 1807 | { |
| 1808 | struct e100_serial *info = (struct e100_serial *)data; |
| 1809 | |
| 1810 | fast_timers_rs485[info->line].function = NULL; |
| 1811 | e100_rts(info, info->rs485.rts_after_sent); |
| 1812 | #if defined(CONFIG_ETRAX_RS485_DISABLE_RECEIVER) |
| 1813 | e100_enable_rx(info); |
| 1814 | e100_enable_rx_irq(info); |
| 1815 | #endif |
| 1816 | } |
| 1817 | #endif |
| 1818 | #endif /* CONFIG_ETRAX_RS485 */ |
| 1819 | |
| 1820 | /* |
| 1821 | * ------------------------------------------------------------ |
| 1822 | * rs_stop() and rs_start() |
| 1823 | * |
| 1824 | * This routines are called before setting or resetting tty->stopped. |
| 1825 | * They enable or disable transmitter using the XOFF registers, as necessary. |
| 1826 | * ------------------------------------------------------------ |
| 1827 | */ |
| 1828 | |
| 1829 | static void |
| 1830 | rs_stop(struct tty_struct *tty) |
| 1831 | { |
| 1832 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; |
| 1833 | if (info) { |
| 1834 | unsigned long flags; |
| 1835 | unsigned long xoff; |
| 1836 | |
| 1837 | save_flags(flags); cli(); |
| 1838 | DFLOW(DEBUG_LOG(info->line, "XOFF rs_stop xmit %i\n", |
| 1839 | CIRC_CNT(info->xmit.head, |
| 1840 | info->xmit.tail,SERIAL_XMIT_SIZE))); |
| 1841 | |
| 1842 | xoff = IO_FIELD(R_SERIAL0_XOFF, xoff_char, STOP_CHAR(info->tty)); |
| 1843 | xoff |= IO_STATE(R_SERIAL0_XOFF, tx_stop, stop); |
| 1844 | if (tty->termios->c_iflag & IXON ) { |
| 1845 | xoff |= IO_STATE(R_SERIAL0_XOFF, auto_xoff, enable); |
| 1846 | } |
| 1847 | |
| 1848 | *((unsigned long *)&info->port[REG_XOFF]) = xoff; |
| 1849 | restore_flags(flags); |
| 1850 | } |
| 1851 | } |
| 1852 | |
| 1853 | static void |
| 1854 | rs_start(struct tty_struct *tty) |
| 1855 | { |
| 1856 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; |
| 1857 | if (info) { |
| 1858 | unsigned long flags; |
| 1859 | unsigned long xoff; |
| 1860 | |
| 1861 | save_flags(flags); cli(); |
| 1862 | DFLOW(DEBUG_LOG(info->line, "XOFF rs_start xmit %i\n", |
| 1863 | CIRC_CNT(info->xmit.head, |
| 1864 | info->xmit.tail,SERIAL_XMIT_SIZE))); |
| 1865 | xoff = IO_FIELD(R_SERIAL0_XOFF, xoff_char, STOP_CHAR(tty)); |
| 1866 | xoff |= IO_STATE(R_SERIAL0_XOFF, tx_stop, enable); |
| 1867 | if (tty->termios->c_iflag & IXON ) { |
| 1868 | xoff |= IO_STATE(R_SERIAL0_XOFF, auto_xoff, enable); |
| 1869 | } |
| 1870 | |
| 1871 | *((unsigned long *)&info->port[REG_XOFF]) = xoff; |
| 1872 | if (!info->uses_dma_out && |
| 1873 | info->xmit.head != info->xmit.tail && info->xmit.buf) |
| 1874 | e100_enable_serial_tx_ready_irq(info); |
| 1875 | |
| 1876 | restore_flags(flags); |
| 1877 | } |
| 1878 | } |
| 1879 | |
| 1880 | /* |
| 1881 | * ---------------------------------------------------------------------- |
| 1882 | * |
| 1883 | * Here starts the interrupt handling routines. All of the following |
| 1884 | * subroutines are declared as inline and are folded into |
| 1885 | * rs_interrupt(). They were separated out for readability's sake. |
| 1886 | * |
| 1887 | * Note: rs_interrupt() is a "fast" interrupt, which means that it |
| 1888 | * runs with interrupts turned off. People who may want to modify |
| 1889 | * rs_interrupt() should try to keep the interrupt handler as fast as |
| 1890 | * possible. After you are done making modifications, it is not a bad |
| 1891 | * idea to do: |
| 1892 | * |
| 1893 | * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c |
| 1894 | * |
| 1895 | * and look at the resulting assemble code in serial.s. |
| 1896 | * |
| 1897 | * - Ted Ts'o (tytso@mit.edu), 7-Mar-93 |
| 1898 | * ----------------------------------------------------------------------- |
| 1899 | */ |
| 1900 | |
| 1901 | /* |
| 1902 | * This routine is used by the interrupt handler to schedule |
| 1903 | * processing in the software interrupt portion of the driver. |
| 1904 | */ |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 1905 | static void rs_sched_event(struct e100_serial *info, int event) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1906 | { |
| 1907 | if (info->event & (1 << event)) |
| 1908 | return; |
| 1909 | info->event |= 1 << event; |
| 1910 | schedule_work(&info->work); |
| 1911 | } |
| 1912 | |
| 1913 | /* The output DMA channel is free - use it to send as many chars as possible |
| 1914 | * NOTES: |
| 1915 | * We don't pay attention to info->x_char, which means if the TTY wants to |
| 1916 | * use XON/XOFF it will set info->x_char but we won't send any X char! |
| 1917 | * |
| 1918 | * To implement this, we'd just start a DMA send of 1 byte pointing at a |
| 1919 | * buffer containing the X char, and skip updating xmit. We'd also have to |
| 1920 | * check if the last sent char was the X char when we enter this function |
| 1921 | * the next time, to avoid updating xmit with the sent X value. |
| 1922 | */ |
| 1923 | |
| 1924 | static void |
| 1925 | transmit_chars_dma(struct e100_serial *info) |
| 1926 | { |
| 1927 | unsigned int c, sentl; |
| 1928 | struct etrax_dma_descr *descr; |
| 1929 | |
| 1930 | #ifdef CONFIG_SVINTO_SIM |
| 1931 | /* This will output too little if tail is not 0 always since |
| 1932 | * we don't reloop to send the other part. Anyway this SHOULD be a |
| 1933 | * no-op - transmit_chars_dma would never really be called during sim |
| 1934 | * since rs_write does not write into the xmit buffer then. |
| 1935 | */ |
| 1936 | if (info->xmit.tail) |
| 1937 | printk("Error in serial.c:transmit_chars-dma(), tail!=0\n"); |
| 1938 | if (info->xmit.head != info->xmit.tail) { |
| 1939 | SIMCOUT(info->xmit.buf + info->xmit.tail, |
| 1940 | CIRC_CNT(info->xmit.head, |
| 1941 | info->xmit.tail, |
| 1942 | SERIAL_XMIT_SIZE)); |
| 1943 | info->xmit.head = info->xmit.tail; /* move back head */ |
| 1944 | info->tr_running = 0; |
| 1945 | } |
| 1946 | return; |
| 1947 | #endif |
| 1948 | /* acknowledge both dma_descr and dma_eop irq in R_DMA_CHx_CLR_INTR */ |
| 1949 | *info->oclrintradr = |
| 1950 | IO_STATE(R_DMA_CH6_CLR_INTR, clr_descr, do) | |
| 1951 | IO_STATE(R_DMA_CH6_CLR_INTR, clr_eop, do); |
| 1952 | |
| 1953 | #ifdef SERIAL_DEBUG_INTR |
| 1954 | if (info->line == SERIAL_DEBUG_LINE) |
| 1955 | printk("tc\n"); |
| 1956 | #endif |
| 1957 | if (!info->tr_running) { |
| 1958 | /* weirdo... we shouldn't get here! */ |
| 1959 | printk(KERN_WARNING "Achtung: transmit_chars_dma with !tr_running\n"); |
| 1960 | return; |
| 1961 | } |
| 1962 | |
| 1963 | descr = &info->tr_descr; |
| 1964 | |
| 1965 | /* first get the amount of bytes sent during the last DMA transfer, |
| 1966 | and update xmit accordingly */ |
| 1967 | |
| 1968 | /* if the stop bit was not set, all data has been sent */ |
| 1969 | if (!(descr->status & d_stop)) { |
| 1970 | sentl = descr->sw_len; |
| 1971 | } else |
| 1972 | /* otherwise we find the amount of data sent here */ |
| 1973 | sentl = descr->hw_len; |
| 1974 | |
| 1975 | DFLOW(DEBUG_LOG(info->line, "TX %i done\n", sentl)); |
| 1976 | |
| 1977 | /* update stats */ |
| 1978 | info->icount.tx += sentl; |
| 1979 | |
| 1980 | /* update xmit buffer */ |
| 1981 | info->xmit.tail = (info->xmit.tail + sentl) & (SERIAL_XMIT_SIZE - 1); |
| 1982 | |
| 1983 | /* if there is only a few chars left in the buf, wake up the blocked |
| 1984 | write if any */ |
| 1985 | if (CIRC_CNT(info->xmit.head, |
| 1986 | info->xmit.tail, |
| 1987 | SERIAL_XMIT_SIZE) < WAKEUP_CHARS) |
| 1988 | rs_sched_event(info, RS_EVENT_WRITE_WAKEUP); |
| 1989 | |
| 1990 | /* find out the largest amount of consecutive bytes we want to send now */ |
| 1991 | |
| 1992 | c = CIRC_CNT_TO_END(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); |
| 1993 | |
| 1994 | /* Don't send all in one DMA transfer - divide it so we wake up |
| 1995 | * application before all is sent |
| 1996 | */ |
| 1997 | |
| 1998 | if (c >= 4*WAKEUP_CHARS) |
| 1999 | c = c/2; |
| 2000 | |
| 2001 | if (c <= 0) { |
| 2002 | /* our job here is done, don't schedule any new DMA transfer */ |
| 2003 | info->tr_running = 0; |
| 2004 | |
| 2005 | #if defined(CONFIG_ETRAX_RS485) && defined(CONFIG_ETRAX_FAST_TIMER) |
| 2006 | if (info->rs485.enabled) { |
| 2007 | /* Set a short timer to toggle RTS */ |
| 2008 | start_one_shot_timer(&fast_timers_rs485[info->line], |
| 2009 | rs485_toggle_rts_timer_function, |
| 2010 | (unsigned long)info, |
| 2011 | info->char_time_usec*2, |
| 2012 | "RS-485"); |
| 2013 | } |
| 2014 | #endif /* RS485 */ |
| 2015 | return; |
| 2016 | } |
| 2017 | |
| 2018 | /* ok we can schedule a dma send of c chars starting at info->xmit.tail */ |
| 2019 | /* set up the descriptor correctly for output */ |
| 2020 | DFLOW(DEBUG_LOG(info->line, "TX %i\n", c)); |
| 2021 | descr->ctrl = d_int | d_eol | d_wait; /* Wait needed for tty_wait_until_sent() */ |
| 2022 | descr->sw_len = c; |
| 2023 | descr->buf = virt_to_phys(info->xmit.buf + info->xmit.tail); |
| 2024 | descr->status = 0; |
| 2025 | |
| 2026 | *info->ofirstadr = virt_to_phys(descr); /* write to R_DMAx_FIRST */ |
| 2027 | *info->ocmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, start); |
| 2028 | |
| 2029 | /* DMA is now running (hopefully) */ |
| 2030 | } /* transmit_chars_dma */ |
| 2031 | |
| 2032 | static void |
| 2033 | start_transmit(struct e100_serial *info) |
| 2034 | { |
| 2035 | #if 0 |
| 2036 | if (info->line == SERIAL_DEBUG_LINE) |
| 2037 | printk("x\n"); |
| 2038 | #endif |
| 2039 | |
| 2040 | info->tr_descr.sw_len = 0; |
| 2041 | info->tr_descr.hw_len = 0; |
| 2042 | info->tr_descr.status = 0; |
| 2043 | info->tr_running = 1; |
| 2044 | if (info->uses_dma_out) |
| 2045 | transmit_chars_dma(info); |
| 2046 | else |
| 2047 | e100_enable_serial_tx_ready_irq(info); |
| 2048 | } /* start_transmit */ |
| 2049 | |
| 2050 | #ifdef CONFIG_ETRAX_SERIAL_FAST_TIMER |
| 2051 | static int serial_fast_timer_started = 0; |
| 2052 | static int serial_fast_timer_expired = 0; |
| 2053 | static void flush_timeout_function(unsigned long data); |
| 2054 | #define START_FLUSH_FAST_TIMER_TIME(info, string, usec) {\ |
| 2055 | unsigned long timer_flags; \ |
| 2056 | save_flags(timer_flags); \ |
| 2057 | cli(); \ |
| 2058 | if (fast_timers[info->line].function == NULL) { \ |
| 2059 | serial_fast_timer_started++; \ |
| 2060 | TIMERD(DEBUG_LOG(info->line, "start_timer %i ", info->line)); \ |
| 2061 | TIMERD(DEBUG_LOG(info->line, "num started: %i\n", serial_fast_timer_started)); \ |
| 2062 | start_one_shot_timer(&fast_timers[info->line], \ |
| 2063 | flush_timeout_function, \ |
| 2064 | (unsigned long)info, \ |
| 2065 | (usec), \ |
| 2066 | string); \ |
| 2067 | } \ |
| 2068 | else { \ |
| 2069 | TIMERD(DEBUG_LOG(info->line, "timer %i already running\n", info->line)); \ |
| 2070 | } \ |
| 2071 | restore_flags(timer_flags); \ |
| 2072 | } |
| 2073 | #define START_FLUSH_FAST_TIMER(info, string) START_FLUSH_FAST_TIMER_TIME(info, string, info->flush_time_usec) |
| 2074 | |
| 2075 | #else |
| 2076 | #define START_FLUSH_FAST_TIMER_TIME(info, string, usec) |
| 2077 | #define START_FLUSH_FAST_TIMER(info, string) |
| 2078 | #endif |
| 2079 | |
| 2080 | static struct etrax_recv_buffer * |
| 2081 | alloc_recv_buffer(unsigned int size) |
| 2082 | { |
| 2083 | struct etrax_recv_buffer *buffer; |
| 2084 | |
| 2085 | if (!(buffer = kmalloc(sizeof *buffer + size, GFP_ATOMIC))) |
| 2086 | return NULL; |
| 2087 | |
| 2088 | buffer->next = NULL; |
| 2089 | buffer->length = 0; |
| 2090 | buffer->error = TTY_NORMAL; |
| 2091 | |
| 2092 | return buffer; |
| 2093 | } |
| 2094 | |
| 2095 | static void |
| 2096 | append_recv_buffer(struct e100_serial *info, struct etrax_recv_buffer *buffer) |
| 2097 | { |
| 2098 | unsigned long flags; |
| 2099 | |
| 2100 | save_flags(flags); |
| 2101 | cli(); |
| 2102 | |
| 2103 | if (!info->first_recv_buffer) |
| 2104 | info->first_recv_buffer = buffer; |
| 2105 | else |
| 2106 | info->last_recv_buffer->next = buffer; |
| 2107 | |
| 2108 | info->last_recv_buffer = buffer; |
| 2109 | |
| 2110 | info->recv_cnt += buffer->length; |
| 2111 | if (info->recv_cnt > info->max_recv_cnt) |
| 2112 | info->max_recv_cnt = info->recv_cnt; |
| 2113 | |
| 2114 | restore_flags(flags); |
| 2115 | } |
| 2116 | |
| 2117 | static int |
| 2118 | add_char_and_flag(struct e100_serial *info, unsigned char data, unsigned char flag) |
| 2119 | { |
| 2120 | struct etrax_recv_buffer *buffer; |
| 2121 | if (info->uses_dma_in) { |
| 2122 | if (!(buffer = alloc_recv_buffer(4))) |
| 2123 | return 0; |
| 2124 | |
| 2125 | buffer->length = 1; |
| 2126 | buffer->error = flag; |
| 2127 | buffer->buffer[0] = data; |
| 2128 | |
| 2129 | append_recv_buffer(info, buffer); |
| 2130 | |
| 2131 | info->icount.rx++; |
| 2132 | } else { |
| 2133 | struct tty_struct *tty = info->tty; |
| 2134 | *tty->flip.char_buf_ptr = data; |
| 2135 | *tty->flip.flag_buf_ptr = flag; |
| 2136 | tty->flip.flag_buf_ptr++; |
| 2137 | tty->flip.char_buf_ptr++; |
| 2138 | tty->flip.count++; |
| 2139 | info->icount.rx++; |
| 2140 | } |
| 2141 | |
| 2142 | return 1; |
| 2143 | } |
| 2144 | |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 2145 | static unsigned int handle_descr_data(struct e100_serial *info, |
| 2146 | struct etrax_dma_descr *descr, |
| 2147 | unsigned int recvl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2148 | { |
| 2149 | struct etrax_recv_buffer *buffer = phys_to_virt(descr->buf) - sizeof *buffer; |
| 2150 | |
| 2151 | if (info->recv_cnt + recvl > 65536) { |
| 2152 | printk(KERN_CRIT |
| 2153 | "%s: Too much pending incoming serial data! Dropping %u bytes.\n", __FUNCTION__, recvl); |
| 2154 | return 0; |
| 2155 | } |
| 2156 | |
| 2157 | buffer->length = recvl; |
| 2158 | |
| 2159 | if (info->errorcode == ERRCODE_SET_BREAK) |
| 2160 | buffer->error = TTY_BREAK; |
| 2161 | info->errorcode = 0; |
| 2162 | |
| 2163 | append_recv_buffer(info, buffer); |
| 2164 | |
| 2165 | if (!(buffer = alloc_recv_buffer(SERIAL_DESCR_BUF_SIZE))) |
| 2166 | panic("%s: Failed to allocate memory for receive buffer!\n", __FUNCTION__); |
| 2167 | |
| 2168 | descr->buf = virt_to_phys(buffer->buffer); |
| 2169 | |
| 2170 | return recvl; |
| 2171 | } |
| 2172 | |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 2173 | static unsigned int handle_all_descr_data(struct e100_serial *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2174 | { |
| 2175 | struct etrax_dma_descr *descr; |
| 2176 | unsigned int recvl; |
| 2177 | unsigned int ret = 0; |
| 2178 | |
| 2179 | while (1) |
| 2180 | { |
| 2181 | descr = &info->rec_descr[info->cur_rec_descr]; |
| 2182 | |
| 2183 | if (descr == phys_to_virt(*info->idescradr)) |
| 2184 | break; |
| 2185 | |
| 2186 | if (++info->cur_rec_descr == SERIAL_RECV_DESCRIPTORS) |
| 2187 | info->cur_rec_descr = 0; |
| 2188 | |
| 2189 | /* find out how many bytes were read */ |
| 2190 | |
| 2191 | /* if the eop bit was not set, all data has been received */ |
| 2192 | if (!(descr->status & d_eop)) { |
| 2193 | recvl = descr->sw_len; |
| 2194 | } else { |
| 2195 | /* otherwise we find the amount of data received here */ |
| 2196 | recvl = descr->hw_len; |
| 2197 | } |
| 2198 | |
| 2199 | /* Reset the status information */ |
| 2200 | descr->status = 0; |
| 2201 | |
| 2202 | DFLOW( DEBUG_LOG(info->line, "RX %lu\n", recvl); |
| 2203 | if (info->tty->stopped) { |
| 2204 | unsigned char *buf = phys_to_virt(descr->buf); |
| 2205 | DEBUG_LOG(info->line, "rx 0x%02X\n", buf[0]); |
| 2206 | DEBUG_LOG(info->line, "rx 0x%02X\n", buf[1]); |
| 2207 | DEBUG_LOG(info->line, "rx 0x%02X\n", buf[2]); |
| 2208 | } |
| 2209 | ); |
| 2210 | |
| 2211 | /* update stats */ |
| 2212 | info->icount.rx += recvl; |
| 2213 | |
| 2214 | ret += handle_descr_data(info, descr, recvl); |
| 2215 | } |
| 2216 | |
| 2217 | return ret; |
| 2218 | } |
| 2219 | |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 2220 | static void receive_chars_dma(struct e100_serial *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2221 | { |
| 2222 | struct tty_struct *tty; |
| 2223 | unsigned char rstat; |
| 2224 | |
| 2225 | #ifdef CONFIG_SVINTO_SIM |
| 2226 | /* No receive in the simulator. Will probably be when the rest of |
| 2227 | * the serial interface works, and this piece will just be removed. |
| 2228 | */ |
| 2229 | return; |
| 2230 | #endif |
| 2231 | |
| 2232 | /* Acknowledge both dma_descr and dma_eop irq in R_DMA_CHx_CLR_INTR */ |
| 2233 | *info->iclrintradr = |
| 2234 | IO_STATE(R_DMA_CH6_CLR_INTR, clr_descr, do) | |
| 2235 | IO_STATE(R_DMA_CH6_CLR_INTR, clr_eop, do); |
| 2236 | |
| 2237 | tty = info->tty; |
| 2238 | if (!tty) /* Something wrong... */ |
| 2239 | return; |
| 2240 | |
| 2241 | #ifdef SERIAL_HANDLE_EARLY_ERRORS |
| 2242 | if (info->uses_dma_in) |
| 2243 | e100_enable_serial_data_irq(info); |
| 2244 | #endif |
| 2245 | |
| 2246 | if (info->errorcode == ERRCODE_INSERT_BREAK) |
| 2247 | add_char_and_flag(info, '\0', TTY_BREAK); |
| 2248 | |
| 2249 | handle_all_descr_data(info); |
| 2250 | |
| 2251 | /* Read the status register to detect errors */ |
| 2252 | rstat = info->port[REG_STATUS]; |
| 2253 | if (rstat & IO_MASK(R_SERIAL0_STATUS, xoff_detect) ) { |
| 2254 | DFLOW(DEBUG_LOG(info->line, "XOFF detect stat %x\n", rstat)); |
| 2255 | } |
| 2256 | |
| 2257 | if (rstat & SER_ERROR_MASK) { |
| 2258 | /* If we got an error, we must reset it by reading the |
| 2259 | * data_in field |
| 2260 | */ |
| 2261 | unsigned char data = info->port[REG_DATA]; |
| 2262 | |
| 2263 | PROCSTAT(ser_stat[info->line].errors_cnt++); |
| 2264 | DEBUG_LOG(info->line, "#dERR: s d 0x%04X\n", |
| 2265 | ((rstat & SER_ERROR_MASK) << 8) | data); |
| 2266 | |
| 2267 | if (rstat & SER_PAR_ERR_MASK) |
| 2268 | add_char_and_flag(info, data, TTY_PARITY); |
| 2269 | else if (rstat & SER_OVERRUN_MASK) |
| 2270 | add_char_and_flag(info, data, TTY_OVERRUN); |
| 2271 | else if (rstat & SER_FRAMING_ERR_MASK) |
| 2272 | add_char_and_flag(info, data, TTY_FRAME); |
| 2273 | } |
| 2274 | |
| 2275 | START_FLUSH_FAST_TIMER(info, "receive_chars"); |
| 2276 | |
| 2277 | /* Restart the receiving DMA */ |
| 2278 | *info->icmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, restart); |
| 2279 | } |
| 2280 | |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 2281 | static int start_recv_dma(struct e100_serial *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2282 | { |
| 2283 | struct etrax_dma_descr *descr = info->rec_descr; |
| 2284 | struct etrax_recv_buffer *buffer; |
| 2285 | int i; |
| 2286 | |
| 2287 | /* Set up the receiving descriptors */ |
| 2288 | for (i = 0; i < SERIAL_RECV_DESCRIPTORS; i++) { |
| 2289 | if (!(buffer = alloc_recv_buffer(SERIAL_DESCR_BUF_SIZE))) |
| 2290 | panic("%s: Failed to allocate memory for receive buffer!\n", __FUNCTION__); |
| 2291 | |
| 2292 | descr[i].ctrl = d_int; |
| 2293 | descr[i].buf = virt_to_phys(buffer->buffer); |
| 2294 | descr[i].sw_len = SERIAL_DESCR_BUF_SIZE; |
| 2295 | descr[i].hw_len = 0; |
| 2296 | descr[i].status = 0; |
| 2297 | descr[i].next = virt_to_phys(&descr[i+1]); |
| 2298 | } |
| 2299 | |
| 2300 | /* Link the last descriptor to the first */ |
| 2301 | descr[i-1].next = virt_to_phys(&descr[0]); |
| 2302 | |
| 2303 | /* Start with the first descriptor in the list */ |
| 2304 | info->cur_rec_descr = 0; |
| 2305 | |
| 2306 | /* Start the DMA */ |
| 2307 | *info->ifirstadr = virt_to_phys(&descr[info->cur_rec_descr]); |
| 2308 | *info->icmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, start); |
| 2309 | |
| 2310 | /* Input DMA should be running now */ |
| 2311 | return 1; |
| 2312 | } |
| 2313 | |
| 2314 | static void |
| 2315 | start_receive(struct e100_serial *info) |
| 2316 | { |
| 2317 | #ifdef CONFIG_SVINTO_SIM |
| 2318 | /* No receive in the simulator. Will probably be when the rest of |
| 2319 | * the serial interface works, and this piece will just be removed. |
| 2320 | */ |
| 2321 | return; |
| 2322 | #endif |
| 2323 | info->tty->flip.count = 0; |
| 2324 | if (info->uses_dma_in) { |
| 2325 | /* reset the input dma channel to be sure it works */ |
| 2326 | |
| 2327 | *info->icmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, reset); |
| 2328 | while (IO_EXTRACT(R_DMA_CH6_CMD, cmd, *info->icmdadr) == |
| 2329 | IO_STATE_VALUE(R_DMA_CH6_CMD, cmd, reset)); |
| 2330 | |
| 2331 | start_recv_dma(info); |
| 2332 | } |
| 2333 | } |
| 2334 | |
| 2335 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2336 | /* the bits in the MASK2 register are laid out like this: |
| 2337 | DMAI_EOP DMAI_DESCR DMAO_EOP DMAO_DESCR |
| 2338 | where I is the input channel and O is the output channel for the port. |
| 2339 | info->irq is the bit number for the DMAO_DESCR so to check the others we |
| 2340 | shift info->irq to the left. |
| 2341 | */ |
| 2342 | |
| 2343 | /* dma output channel interrupt handler |
| 2344 | this interrupt is called from DMA2(ser2), DMA4(ser3), DMA6(ser0) or |
| 2345 | DMA8(ser1) when they have finished a descriptor with the intr flag set. |
| 2346 | */ |
| 2347 | |
| 2348 | static irqreturn_t |
| 2349 | tr_interrupt(int irq, void *dev_id, struct pt_regs * regs) |
| 2350 | { |
| 2351 | struct e100_serial *info; |
| 2352 | unsigned long ireg; |
| 2353 | int i; |
| 2354 | int handled = 0; |
| 2355 | |
| 2356 | #ifdef CONFIG_SVINTO_SIM |
| 2357 | /* No receive in the simulator. Will probably be when the rest of |
| 2358 | * the serial interface works, and this piece will just be removed. |
| 2359 | */ |
| 2360 | { |
| 2361 | const char *s = "What? tr_interrupt in simulator??\n"; |
| 2362 | SIMCOUT(s,strlen(s)); |
| 2363 | } |
| 2364 | return IRQ_HANDLED; |
| 2365 | #endif |
| 2366 | |
| 2367 | /* find out the line that caused this irq and get it from rs_table */ |
| 2368 | |
| 2369 | ireg = *R_IRQ_MASK2_RD; /* get the active irq bits for the dma channels */ |
| 2370 | |
| 2371 | for (i = 0; i < NR_PORTS; i++) { |
| 2372 | info = rs_table + i; |
| 2373 | if (!info->enabled || !info->uses_dma_out) |
| 2374 | continue; |
| 2375 | /* check for dma_descr (don't need to check for dma_eop in output dma for serial */ |
| 2376 | if (ireg & info->irq) { |
| 2377 | handled = 1; |
| 2378 | /* we can send a new dma bunch. make it so. */ |
| 2379 | DINTR2(DEBUG_LOG(info->line, "tr_interrupt %i\n", i)); |
| 2380 | /* Read jiffies_usec first, |
| 2381 | * we want this time to be as late as possible |
| 2382 | */ |
| 2383 | PROCSTAT(ser_stat[info->line].tx_dma_ints++); |
| 2384 | info->last_tx_active_usec = GET_JIFFIES_USEC(); |
| 2385 | info->last_tx_active = jiffies; |
| 2386 | transmit_chars_dma(info); |
| 2387 | } |
| 2388 | |
| 2389 | /* FIXME: here we should really check for a change in the |
| 2390 | status lines and if so call status_handle(info) */ |
| 2391 | } |
| 2392 | return IRQ_RETVAL(handled); |
| 2393 | } /* tr_interrupt */ |
| 2394 | |
| 2395 | /* dma input channel interrupt handler */ |
| 2396 | |
| 2397 | static irqreturn_t |
| 2398 | rec_interrupt(int irq, void *dev_id, struct pt_regs * regs) |
| 2399 | { |
| 2400 | struct e100_serial *info; |
| 2401 | unsigned long ireg; |
| 2402 | int i; |
| 2403 | int handled = 0; |
| 2404 | |
| 2405 | #ifdef CONFIG_SVINTO_SIM |
| 2406 | /* No receive in the simulator. Will probably be when the rest of |
| 2407 | * the serial interface works, and this piece will just be removed. |
| 2408 | */ |
| 2409 | { |
| 2410 | const char *s = "What? rec_interrupt in simulator??\n"; |
| 2411 | SIMCOUT(s,strlen(s)); |
| 2412 | } |
| 2413 | return IRQ_HANDLED; |
| 2414 | #endif |
| 2415 | |
| 2416 | /* find out the line that caused this irq and get it from rs_table */ |
| 2417 | |
| 2418 | ireg = *R_IRQ_MASK2_RD; /* get the active irq bits for the dma channels */ |
| 2419 | |
| 2420 | for (i = 0; i < NR_PORTS; i++) { |
| 2421 | info = rs_table + i; |
| 2422 | if (!info->enabled || !info->uses_dma_in) |
| 2423 | continue; |
| 2424 | /* check for both dma_eop and dma_descr for the input dma channel */ |
| 2425 | if (ireg & ((info->irq << 2) | (info->irq << 3))) { |
| 2426 | handled = 1; |
| 2427 | /* we have received something */ |
| 2428 | receive_chars_dma(info); |
| 2429 | } |
| 2430 | |
| 2431 | /* FIXME: here we should really check for a change in the |
| 2432 | status lines and if so call status_handle(info) */ |
| 2433 | } |
| 2434 | return IRQ_RETVAL(handled); |
| 2435 | } /* rec_interrupt */ |
| 2436 | |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 2437 | static int force_eop_if_needed(struct e100_serial *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2438 | { |
| 2439 | /* We check data_avail bit to determine if data has |
| 2440 | * arrived since last time |
| 2441 | */ |
| 2442 | unsigned char rstat = info->port[REG_STATUS]; |
| 2443 | |
| 2444 | /* error or datavail? */ |
| 2445 | if (rstat & SER_ERROR_MASK) { |
| 2446 | /* Some error has occurred. If there has been valid data, an |
| 2447 | * EOP interrupt will be made automatically. If no data, the |
| 2448 | * normal ser_interrupt should be enabled and handle it. |
| 2449 | * So do nothing! |
| 2450 | */ |
| 2451 | DEBUG_LOG(info->line, "timeout err: rstat 0x%03X\n", |
| 2452 | rstat | (info->line << 8)); |
| 2453 | return 0; |
| 2454 | } |
| 2455 | |
| 2456 | if (rstat & SER_DATA_AVAIL_MASK) { |
| 2457 | /* Ok data, no error, count it */ |
| 2458 | TIMERD(DEBUG_LOG(info->line, "timeout: rstat 0x%03X\n", |
| 2459 | rstat | (info->line << 8))); |
| 2460 | /* Read data to clear status flags */ |
| 2461 | (void)info->port[REG_DATA]; |
| 2462 | |
| 2463 | info->forced_eop = 0; |
| 2464 | START_FLUSH_FAST_TIMER(info, "magic"); |
| 2465 | return 0; |
| 2466 | } |
| 2467 | |
| 2468 | /* hit the timeout, force an EOP for the input |
| 2469 | * dma channel if we haven't already |
| 2470 | */ |
| 2471 | if (!info->forced_eop) { |
| 2472 | info->forced_eop = 1; |
| 2473 | PROCSTAT(ser_stat[info->line].timeout_flush_cnt++); |
| 2474 | TIMERD(DEBUG_LOG(info->line, "timeout EOP %i\n", info->line)); |
| 2475 | FORCE_EOP(info); |
| 2476 | } |
| 2477 | |
| 2478 | return 1; |
| 2479 | } |
| 2480 | |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 2481 | static void flush_to_flip_buffer(struct e100_serial *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2482 | { |
| 2483 | struct tty_struct *tty; |
| 2484 | struct etrax_recv_buffer *buffer; |
| 2485 | unsigned int length; |
| 2486 | unsigned long flags; |
| 2487 | int max_flip_size; |
| 2488 | |
| 2489 | if (!info->first_recv_buffer) |
| 2490 | return; |
| 2491 | |
| 2492 | save_flags(flags); |
| 2493 | cli(); |
| 2494 | |
| 2495 | if (!(tty = info->tty)) { |
| 2496 | restore_flags(flags); |
| 2497 | return; |
| 2498 | } |
| 2499 | |
| 2500 | length = tty->flip.count; |
| 2501 | /* Don't flip more than the ldisc has room for. |
| 2502 | * The return value from ldisc.receive_room(tty) - might not be up to |
| 2503 | * date, the previous flip of up to TTY_FLIPBUF_SIZE might be on the |
| 2504 | * processed and not accounted for yet. |
| 2505 | * Since we use DMA, 1 SERIAL_DESCR_BUF_SIZE could be on the way. |
| 2506 | * Lets buffer data here and let flow control take care of it. |
| 2507 | * Since we normally flip large chunks, the ldisc don't react |
| 2508 | * with throttle until too late if we flip to much. |
| 2509 | */ |
| 2510 | max_flip_size = tty->ldisc.receive_room(tty); |
| 2511 | if (max_flip_size < 0) |
| 2512 | max_flip_size = 0; |
| 2513 | if (max_flip_size <= (TTY_FLIPBUF_SIZE + /* Maybe not accounted for */ |
| 2514 | length + info->recv_cnt + /* We have this queued */ |
| 2515 | 2*SERIAL_DESCR_BUF_SIZE + /* This could be on the way */ |
| 2516 | TTY_THRESHOLD_THROTTLE)) { /* Some slack */ |
| 2517 | /* check TTY_THROTTLED first so it indicates our state */ |
| 2518 | if (!test_and_set_bit(TTY_THROTTLED, &tty->flags)) { |
| 2519 | DFLOW(DEBUG_LOG(info->line,"flush_to_flip throttles room %lu\n", max_flip_size)); |
| 2520 | rs_throttle(tty); |
| 2521 | } |
| 2522 | #if 0 |
| 2523 | else if (max_flip_size <= (TTY_FLIPBUF_SIZE + /* Maybe not accounted for */ |
| 2524 | length + info->recv_cnt + /* We have this queued */ |
| 2525 | SERIAL_DESCR_BUF_SIZE + /* This could be on the way */ |
| 2526 | TTY_THRESHOLD_THROTTLE)) { /* Some slack */ |
| 2527 | DFLOW(DEBUG_LOG(info->line,"flush_to_flip throttles again! %lu\n", max_flip_size)); |
| 2528 | rs_throttle(tty); |
| 2529 | } |
| 2530 | #endif |
| 2531 | } |
| 2532 | |
| 2533 | if (max_flip_size > TTY_FLIPBUF_SIZE) |
| 2534 | max_flip_size = TTY_FLIPBUF_SIZE; |
| 2535 | |
| 2536 | while ((buffer = info->first_recv_buffer) && length < max_flip_size) { |
| 2537 | unsigned int count = buffer->length; |
| 2538 | |
| 2539 | if (length + count > max_flip_size) |
| 2540 | count = max_flip_size - length; |
| 2541 | |
| 2542 | memcpy(tty->flip.char_buf_ptr + length, buffer->buffer, count); |
| 2543 | memset(tty->flip.flag_buf_ptr + length, TTY_NORMAL, count); |
| 2544 | tty->flip.flag_buf_ptr[length] = buffer->error; |
| 2545 | |
| 2546 | length += count; |
| 2547 | info->recv_cnt -= count; |
| 2548 | DFLIP(DEBUG_LOG(info->line,"flip: %i\n", length)); |
| 2549 | |
| 2550 | if (count == buffer->length) { |
| 2551 | info->first_recv_buffer = buffer->next; |
| 2552 | kfree(buffer); |
| 2553 | } else { |
| 2554 | buffer->length -= count; |
| 2555 | memmove(buffer->buffer, buffer->buffer + count, buffer->length); |
| 2556 | buffer->error = TTY_NORMAL; |
| 2557 | } |
| 2558 | } |
| 2559 | |
| 2560 | if (!info->first_recv_buffer) |
| 2561 | info->last_recv_buffer = NULL; |
| 2562 | |
| 2563 | tty->flip.count = length; |
| 2564 | DFLIP(if (tty->ldisc.chars_in_buffer(tty) > 3500) { |
| 2565 | DEBUG_LOG(info->line, "ldisc %lu\n", |
| 2566 | tty->ldisc.chars_in_buffer(tty)); |
| 2567 | DEBUG_LOG(info->line, "flip.count %lu\n", |
| 2568 | tty->flip.count); |
| 2569 | } |
| 2570 | ); |
| 2571 | restore_flags(flags); |
| 2572 | |
| 2573 | DFLIP( |
| 2574 | if (1) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2575 | DEBUG_LOG(info->line, "*** rxtot %i\n", info->icount.rx); |
| 2576 | DEBUG_LOG(info->line, "ldisc %lu\n", tty->ldisc.chars_in_buffer(tty)); |
| 2577 | DEBUG_LOG(info->line, "room %lu\n", tty->ldisc.receive_room(tty)); |
| 2578 | } |
| 2579 | |
| 2580 | ); |
| 2581 | |
| 2582 | /* this includes a check for low-latency */ |
| 2583 | tty_flip_buffer_push(tty); |
| 2584 | } |
| 2585 | |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 2586 | static void check_flush_timeout(struct e100_serial *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2587 | { |
| 2588 | /* Flip what we've got (if we can) */ |
| 2589 | flush_to_flip_buffer(info); |
| 2590 | |
| 2591 | /* We might need to flip later, but not to fast |
| 2592 | * since the system is busy processing input... */ |
| 2593 | if (info->first_recv_buffer) |
| 2594 | START_FLUSH_FAST_TIMER_TIME(info, "flip", 2000); |
| 2595 | |
| 2596 | /* Force eop last, since data might have come while we're processing |
| 2597 | * and if we started the slow timer above, we won't start a fast |
| 2598 | * below. |
| 2599 | */ |
| 2600 | force_eop_if_needed(info); |
| 2601 | } |
| 2602 | |
| 2603 | #ifdef CONFIG_ETRAX_SERIAL_FAST_TIMER |
| 2604 | static void flush_timeout_function(unsigned long data) |
| 2605 | { |
| 2606 | struct e100_serial *info = (struct e100_serial *)data; |
| 2607 | |
| 2608 | fast_timers[info->line].function = NULL; |
| 2609 | serial_fast_timer_expired++; |
| 2610 | TIMERD(DEBUG_LOG(info->line, "flush_timout %i ", info->line)); |
| 2611 | TIMERD(DEBUG_LOG(info->line, "num expired: %i\n", serial_fast_timer_expired)); |
| 2612 | check_flush_timeout(info); |
| 2613 | } |
| 2614 | |
| 2615 | #else |
| 2616 | |
| 2617 | /* dma fifo/buffer timeout handler |
| 2618 | forces an end-of-packet for the dma input channel if no chars |
| 2619 | have been received for CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS/100 s. |
| 2620 | */ |
| 2621 | |
| 2622 | static struct timer_list flush_timer; |
| 2623 | |
| 2624 | static void |
| 2625 | timed_flush_handler(unsigned long ptr) |
| 2626 | { |
| 2627 | struct e100_serial *info; |
| 2628 | int i; |
| 2629 | |
| 2630 | #ifdef CONFIG_SVINTO_SIM |
| 2631 | return; |
| 2632 | #endif |
| 2633 | |
| 2634 | for (i = 0; i < NR_PORTS; i++) { |
| 2635 | info = rs_table + i; |
| 2636 | if (info->uses_dma_in) |
| 2637 | check_flush_timeout(info); |
| 2638 | } |
| 2639 | |
| 2640 | /* restart flush timer */ |
| 2641 | mod_timer(&flush_timer, jiffies + CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS); |
| 2642 | } |
| 2643 | #endif |
| 2644 | |
| 2645 | #ifdef SERIAL_HANDLE_EARLY_ERRORS |
| 2646 | |
| 2647 | /* If there is an error (ie break) when the DMA is running and |
| 2648 | * there are no bytes in the fifo the DMA is stopped and we get no |
| 2649 | * eop interrupt. Thus we have to monitor the first bytes on a DMA |
| 2650 | * transfer, and if it is without error we can turn the serial |
| 2651 | * interrupts off. |
| 2652 | */ |
| 2653 | |
| 2654 | /* |
| 2655 | BREAK handling on ETRAX 100: |
| 2656 | ETRAX will generate interrupt although there is no stop bit between the |
| 2657 | characters. |
| 2658 | |
| 2659 | Depending on how long the break sequence is, the end of the breaksequence |
| 2660 | will look differently: |
| 2661 | | indicates start/end of a character. |
| 2662 | |
| 2663 | B= Break character (0x00) with framing error. |
| 2664 | E= Error byte with parity error received after B characters. |
| 2665 | F= "Faked" valid byte received immediately after B characters. |
| 2666 | V= Valid byte |
| 2667 | |
| 2668 | 1. |
| 2669 | B BL ___________________________ V |
| 2670 | .._|__________|__________| |valid data | |
| 2671 | |
| 2672 | Multiple frame errors with data == 0x00 (B), |
| 2673 | the timing matches up "perfectly" so no extra ending char is detected. |
| 2674 | The RXD pin is 1 in the last interrupt, in that case |
| 2675 | we set info->errorcode = ERRCODE_INSERT_BREAK, but we can't really |
| 2676 | know if another byte will come and this really is case 2. below |
| 2677 | (e.g F=0xFF or 0xFE) |
| 2678 | If RXD pin is 0 we can expect another character (see 2. below). |
| 2679 | |
| 2680 | |
| 2681 | 2. |
| 2682 | |
| 2683 | B B E or F__________________..__ V |
| 2684 | .._|__________|__________|______ | |valid data |
| 2685 | "valid" or |
| 2686 | parity error |
| 2687 | |
| 2688 | Multiple frame errors with data == 0x00 (B), |
| 2689 | but the part of the break trigs is interpreted as a start bit (and possibly |
| 2690 | some 0 bits followed by a number of 1 bits and a stop bit). |
| 2691 | Depending on parity settings etc. this last character can be either |
| 2692 | a fake "valid" char (F) or have a parity error (E). |
| 2693 | |
| 2694 | If the character is valid it will be put in the buffer, |
| 2695 | we set info->errorcode = ERRCODE_SET_BREAK so the receive interrupt |
| 2696 | will set the flags so the tty will handle it, |
| 2697 | if it's an error byte it will not be put in the buffer |
| 2698 | and we set info->errorcode = ERRCODE_INSERT_BREAK. |
| 2699 | |
| 2700 | To distinguish a V byte in 1. from an F byte in 2. we keep a timestamp |
| 2701 | of the last faulty char (B) and compares it with the current time: |
| 2702 | If the time elapsed time is less then 2*char_time_usec we will assume |
| 2703 | it's a faked F char and not a Valid char and set |
| 2704 | info->errorcode = ERRCODE_SET_BREAK. |
| 2705 | |
| 2706 | Flaws in the above solution: |
| 2707 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| 2708 | We use the timer to distinguish a F character from a V character, |
| 2709 | if a V character is to close after the break we might make the wrong decision. |
| 2710 | |
| 2711 | TODO: The break will be delayed until an F or V character is received. |
| 2712 | |
| 2713 | */ |
| 2714 | |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 2715 | static |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2716 | struct e100_serial * handle_ser_rx_interrupt_no_dma(struct e100_serial *info) |
| 2717 | { |
| 2718 | unsigned long data_read; |
| 2719 | struct tty_struct *tty = info->tty; |
| 2720 | |
| 2721 | if (!tty) { |
| 2722 | printk("!NO TTY!\n"); |
| 2723 | return info; |
| 2724 | } |
| 2725 | if (tty->flip.count >= TTY_FLIPBUF_SIZE - TTY_THRESHOLD_THROTTLE) { |
| 2726 | /* check TTY_THROTTLED first so it indicates our state */ |
| 2727 | if (!test_and_set_bit(TTY_THROTTLED, &tty->flags)) { |
| 2728 | DFLOW(DEBUG_LOG(info->line, "rs_throttle flip.count: %i\n", tty->flip.count)); |
| 2729 | rs_throttle(tty); |
| 2730 | } |
| 2731 | } |
| 2732 | if (tty->flip.count >= TTY_FLIPBUF_SIZE) { |
| 2733 | DEBUG_LOG(info->line, "force FLIP! %i\n", tty->flip.count); |
| 2734 | tty->flip.work.func((void *) tty); |
| 2735 | if (tty->flip.count >= TTY_FLIPBUF_SIZE) { |
| 2736 | DEBUG_LOG(info->line, "FLIP FULL! %i\n", tty->flip.count); |
| 2737 | return info; /* if TTY_DONT_FLIP is set */ |
| 2738 | } |
| 2739 | } |
| 2740 | /* Read data and status at the same time */ |
| 2741 | data_read = *((unsigned long *)&info->port[REG_DATA_STATUS32]); |
| 2742 | more_data: |
| 2743 | if (data_read & IO_MASK(R_SERIAL0_READ, xoff_detect) ) { |
| 2744 | DFLOW(DEBUG_LOG(info->line, "XOFF detect\n", 0)); |
| 2745 | } |
| 2746 | DINTR2(DEBUG_LOG(info->line, "ser_rx %c\n", IO_EXTRACT(R_SERIAL0_READ, data_in, data_read))); |
| 2747 | |
| 2748 | if (data_read & ( IO_MASK(R_SERIAL0_READ, framing_err) | |
| 2749 | IO_MASK(R_SERIAL0_READ, par_err) | |
| 2750 | IO_MASK(R_SERIAL0_READ, overrun) )) { |
| 2751 | /* An error */ |
| 2752 | info->last_rx_active_usec = GET_JIFFIES_USEC(); |
| 2753 | info->last_rx_active = jiffies; |
| 2754 | DINTR1(DEBUG_LOG(info->line, "ser_rx err stat_data %04X\n", data_read)); |
| 2755 | DLOG_INT_TRIG( |
| 2756 | if (!log_int_trig1_pos) { |
| 2757 | log_int_trig1_pos = log_int_pos; |
| 2758 | log_int(rdpc(), 0, 0); |
| 2759 | } |
| 2760 | ); |
| 2761 | |
| 2762 | |
| 2763 | if ( ((data_read & IO_MASK(R_SERIAL0_READ, data_in)) == 0) && |
| 2764 | (data_read & IO_MASK(R_SERIAL0_READ, framing_err)) ) { |
| 2765 | /* Most likely a break, but we get interrupts over and |
| 2766 | * over again. |
| 2767 | */ |
| 2768 | |
| 2769 | if (!info->break_detected_cnt) { |
| 2770 | DEBUG_LOG(info->line, "#BRK start\n", 0); |
| 2771 | } |
| 2772 | if (data_read & IO_MASK(R_SERIAL0_READ, rxd)) { |
| 2773 | /* The RX pin is high now, so the break |
| 2774 | * must be over, but.... |
| 2775 | * we can't really know if we will get another |
| 2776 | * last byte ending the break or not. |
| 2777 | * And we don't know if the byte (if any) will |
| 2778 | * have an error or look valid. |
| 2779 | */ |
| 2780 | DEBUG_LOG(info->line, "# BL BRK\n", 0); |
| 2781 | info->errorcode = ERRCODE_INSERT_BREAK; |
| 2782 | } |
| 2783 | info->break_detected_cnt++; |
| 2784 | } else { |
| 2785 | /* The error does not look like a break, but could be |
| 2786 | * the end of one |
| 2787 | */ |
| 2788 | if (info->break_detected_cnt) { |
| 2789 | DEBUG_LOG(info->line, "EBRK %i\n", info->break_detected_cnt); |
| 2790 | info->errorcode = ERRCODE_INSERT_BREAK; |
| 2791 | } else { |
| 2792 | if (info->errorcode == ERRCODE_INSERT_BREAK) { |
| 2793 | info->icount.brk++; |
| 2794 | *tty->flip.char_buf_ptr = 0; |
| 2795 | *tty->flip.flag_buf_ptr = TTY_BREAK; |
| 2796 | tty->flip.flag_buf_ptr++; |
| 2797 | tty->flip.char_buf_ptr++; |
| 2798 | tty->flip.count++; |
| 2799 | info->icount.rx++; |
| 2800 | } |
| 2801 | *tty->flip.char_buf_ptr = IO_EXTRACT(R_SERIAL0_READ, data_in, data_read); |
| 2802 | |
| 2803 | if (data_read & IO_MASK(R_SERIAL0_READ, par_err)) { |
| 2804 | info->icount.parity++; |
| 2805 | *tty->flip.flag_buf_ptr = TTY_PARITY; |
| 2806 | } else if (data_read & IO_MASK(R_SERIAL0_READ, overrun)) { |
| 2807 | info->icount.overrun++; |
| 2808 | *tty->flip.flag_buf_ptr = TTY_OVERRUN; |
| 2809 | } else if (data_read & IO_MASK(R_SERIAL0_READ, framing_err)) { |
| 2810 | info->icount.frame++; |
| 2811 | *tty->flip.flag_buf_ptr = TTY_FRAME; |
| 2812 | } |
| 2813 | info->errorcode = 0; |
| 2814 | } |
| 2815 | info->break_detected_cnt = 0; |
| 2816 | } |
| 2817 | } else if (data_read & IO_MASK(R_SERIAL0_READ, data_avail)) { |
| 2818 | /* No error */ |
| 2819 | DLOG_INT_TRIG( |
| 2820 | if (!log_int_trig1_pos) { |
| 2821 | if (log_int_pos >= log_int_size) { |
| 2822 | log_int_pos = 0; |
| 2823 | } |
| 2824 | log_int_trig0_pos = log_int_pos; |
| 2825 | log_int(rdpc(), 0, 0); |
| 2826 | } |
| 2827 | ); |
| 2828 | *tty->flip.char_buf_ptr = IO_EXTRACT(R_SERIAL0_READ, data_in, data_read); |
| 2829 | *tty->flip.flag_buf_ptr = 0; |
| 2830 | } else { |
| 2831 | DEBUG_LOG(info->line, "ser_rx int but no data_avail %08lX\n", data_read); |
| 2832 | } |
| 2833 | |
| 2834 | |
| 2835 | tty->flip.flag_buf_ptr++; |
| 2836 | tty->flip.char_buf_ptr++; |
| 2837 | tty->flip.count++; |
| 2838 | info->icount.rx++; |
| 2839 | data_read = *((unsigned long *)&info->port[REG_DATA_STATUS32]); |
| 2840 | if (data_read & IO_MASK(R_SERIAL0_READ, data_avail)) { |
| 2841 | DEBUG_LOG(info->line, "ser_rx %c in loop\n", IO_EXTRACT(R_SERIAL0_READ, data_in, data_read)); |
| 2842 | goto more_data; |
| 2843 | } |
| 2844 | |
| 2845 | tty_flip_buffer_push(info->tty); |
| 2846 | return info; |
| 2847 | } |
| 2848 | |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 2849 | static struct e100_serial* handle_ser_rx_interrupt(struct e100_serial *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2850 | { |
| 2851 | unsigned char rstat; |
| 2852 | |
| 2853 | #ifdef SERIAL_DEBUG_INTR |
| 2854 | printk("Interrupt from serport %d\n", i); |
| 2855 | #endif |
| 2856 | /* DEBUG_LOG(info->line, "ser_interrupt stat %03X\n", rstat | (i << 8)); */ |
| 2857 | if (!info->uses_dma_in) { |
| 2858 | return handle_ser_rx_interrupt_no_dma(info); |
| 2859 | } |
| 2860 | /* DMA is used */ |
| 2861 | rstat = info->port[REG_STATUS]; |
| 2862 | if (rstat & IO_MASK(R_SERIAL0_STATUS, xoff_detect) ) { |
| 2863 | DFLOW(DEBUG_LOG(info->line, "XOFF detect\n", 0)); |
| 2864 | } |
| 2865 | |
| 2866 | if (rstat & SER_ERROR_MASK) { |
| 2867 | unsigned char data; |
| 2868 | |
| 2869 | info->last_rx_active_usec = GET_JIFFIES_USEC(); |
| 2870 | info->last_rx_active = jiffies; |
| 2871 | /* If we got an error, we must reset it by reading the |
| 2872 | * data_in field |
| 2873 | */ |
| 2874 | data = info->port[REG_DATA]; |
| 2875 | DINTR1(DEBUG_LOG(info->line, "ser_rx! %c\n", data)); |
| 2876 | DINTR1(DEBUG_LOG(info->line, "ser_rx err stat %02X\n", rstat)); |
| 2877 | if (!data && (rstat & SER_FRAMING_ERR_MASK)) { |
| 2878 | /* Most likely a break, but we get interrupts over and |
| 2879 | * over again. |
| 2880 | */ |
| 2881 | |
| 2882 | if (!info->break_detected_cnt) { |
| 2883 | DEBUG_LOG(info->line, "#BRK start\n", 0); |
| 2884 | } |
| 2885 | if (rstat & SER_RXD_MASK) { |
| 2886 | /* The RX pin is high now, so the break |
| 2887 | * must be over, but.... |
| 2888 | * we can't really know if we will get another |
| 2889 | * last byte ending the break or not. |
| 2890 | * And we don't know if the byte (if any) will |
| 2891 | * have an error or look valid. |
| 2892 | */ |
| 2893 | DEBUG_LOG(info->line, "# BL BRK\n", 0); |
| 2894 | info->errorcode = ERRCODE_INSERT_BREAK; |
| 2895 | } |
| 2896 | info->break_detected_cnt++; |
| 2897 | } else { |
| 2898 | /* The error does not look like a break, but could be |
| 2899 | * the end of one |
| 2900 | */ |
| 2901 | if (info->break_detected_cnt) { |
| 2902 | DEBUG_LOG(info->line, "EBRK %i\n", info->break_detected_cnt); |
| 2903 | info->errorcode = ERRCODE_INSERT_BREAK; |
| 2904 | } else { |
| 2905 | if (info->errorcode == ERRCODE_INSERT_BREAK) { |
| 2906 | info->icount.brk++; |
| 2907 | add_char_and_flag(info, '\0', TTY_BREAK); |
| 2908 | } |
| 2909 | |
| 2910 | if (rstat & SER_PAR_ERR_MASK) { |
| 2911 | info->icount.parity++; |
| 2912 | add_char_and_flag(info, data, TTY_PARITY); |
| 2913 | } else if (rstat & SER_OVERRUN_MASK) { |
| 2914 | info->icount.overrun++; |
| 2915 | add_char_and_flag(info, data, TTY_OVERRUN); |
| 2916 | } else if (rstat & SER_FRAMING_ERR_MASK) { |
| 2917 | info->icount.frame++; |
| 2918 | add_char_and_flag(info, data, TTY_FRAME); |
| 2919 | } |
| 2920 | |
| 2921 | info->errorcode = 0; |
| 2922 | } |
| 2923 | info->break_detected_cnt = 0; |
| 2924 | DEBUG_LOG(info->line, "#iERR s d %04X\n", |
| 2925 | ((rstat & SER_ERROR_MASK) << 8) | data); |
| 2926 | } |
| 2927 | PROCSTAT(ser_stat[info->line].early_errors_cnt++); |
| 2928 | } else { /* It was a valid byte, now let the DMA do the rest */ |
| 2929 | unsigned long curr_time_u = GET_JIFFIES_USEC(); |
| 2930 | unsigned long curr_time = jiffies; |
| 2931 | |
| 2932 | if (info->break_detected_cnt) { |
| 2933 | /* Detect if this character is a new valid char or the |
| 2934 | * last char in a break sequence: If LSBits are 0 and |
| 2935 | * MSBits are high AND the time is close to the |
| 2936 | * previous interrupt we should discard it. |
| 2937 | */ |
| 2938 | long elapsed_usec = |
| 2939 | (curr_time - info->last_rx_active) * (1000000/HZ) + |
| 2940 | curr_time_u - info->last_rx_active_usec; |
| 2941 | if (elapsed_usec < 2*info->char_time_usec) { |
| 2942 | DEBUG_LOG(info->line, "FBRK %i\n", info->line); |
| 2943 | /* Report as BREAK (error) and let |
| 2944 | * receive_chars_dma() handle it |
| 2945 | */ |
| 2946 | info->errorcode = ERRCODE_SET_BREAK; |
| 2947 | } else { |
| 2948 | DEBUG_LOG(info->line, "Not end of BRK (V)%i\n", info->line); |
| 2949 | } |
| 2950 | DEBUG_LOG(info->line, "num brk %i\n", info->break_detected_cnt); |
| 2951 | } |
| 2952 | |
| 2953 | #ifdef SERIAL_DEBUG_INTR |
| 2954 | printk("** OK, disabling ser_interrupts\n"); |
| 2955 | #endif |
| 2956 | e100_disable_serial_data_irq(info); |
| 2957 | DINTR2(DEBUG_LOG(info->line, "ser_rx OK %d\n", info->line)); |
| 2958 | info->break_detected_cnt = 0; |
| 2959 | |
| 2960 | PROCSTAT(ser_stat[info->line].ser_ints_ok_cnt++); |
| 2961 | } |
| 2962 | /* Restarting the DMA never hurts */ |
| 2963 | *info->icmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, restart); |
| 2964 | START_FLUSH_FAST_TIMER(info, "ser_int"); |
| 2965 | return info; |
| 2966 | } /* handle_ser_rx_interrupt */ |
| 2967 | |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 2968 | static void handle_ser_tx_interrupt(struct e100_serial *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2969 | { |
| 2970 | unsigned long flags; |
| 2971 | |
| 2972 | if (info->x_char) { |
| 2973 | unsigned char rstat; |
| 2974 | DFLOW(DEBUG_LOG(info->line, "tx_int: xchar 0x%02X\n", info->x_char)); |
| 2975 | save_flags(flags); cli(); |
| 2976 | rstat = info->port[REG_STATUS]; |
| 2977 | DFLOW(DEBUG_LOG(info->line, "stat %x\n", rstat)); |
| 2978 | |
| 2979 | info->port[REG_TR_DATA] = info->x_char; |
| 2980 | info->icount.tx++; |
| 2981 | info->x_char = 0; |
| 2982 | /* We must enable since it is disabled in ser_interrupt */ |
| 2983 | e100_enable_serial_tx_ready_irq(info); |
| 2984 | restore_flags(flags); |
| 2985 | return; |
| 2986 | } |
| 2987 | if (info->uses_dma_out) { |
| 2988 | unsigned char rstat; |
| 2989 | int i; |
| 2990 | /* We only use normal tx interrupt when sending x_char */ |
| 2991 | DFLOW(DEBUG_LOG(info->line, "tx_int: xchar sent\n", 0)); |
| 2992 | save_flags(flags); cli(); |
| 2993 | rstat = info->port[REG_STATUS]; |
| 2994 | DFLOW(DEBUG_LOG(info->line, "stat %x\n", rstat)); |
| 2995 | e100_disable_serial_tx_ready_irq(info); |
| 2996 | if (info->tty->stopped) |
| 2997 | rs_stop(info->tty); |
| 2998 | /* Enable the DMA channel and tell it to continue */ |
| 2999 | e100_enable_txdma_channel(info); |
| 3000 | /* Wait 12 cycles before doing the DMA command */ |
| 3001 | for(i = 6; i > 0; i--) |
| 3002 | nop(); |
| 3003 | |
| 3004 | *info->ocmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, continue); |
| 3005 | restore_flags(flags); |
| 3006 | return; |
| 3007 | } |
| 3008 | /* Normal char-by-char interrupt */ |
| 3009 | if (info->xmit.head == info->xmit.tail |
| 3010 | || info->tty->stopped |
| 3011 | || info->tty->hw_stopped) { |
| 3012 | DFLOW(DEBUG_LOG(info->line, "tx_int: stopped %i\n", info->tty->stopped)); |
| 3013 | e100_disable_serial_tx_ready_irq(info); |
| 3014 | info->tr_running = 0; |
| 3015 | return; |
| 3016 | } |
| 3017 | DINTR2(DEBUG_LOG(info->line, "tx_int %c\n", info->xmit.buf[info->xmit.tail])); |
| 3018 | /* Send a byte, rs485 timing is critical so turn of ints */ |
| 3019 | save_flags(flags); cli(); |
| 3020 | info->port[REG_TR_DATA] = info->xmit.buf[info->xmit.tail]; |
| 3021 | info->xmit.tail = (info->xmit.tail + 1) & (SERIAL_XMIT_SIZE-1); |
| 3022 | info->icount.tx++; |
| 3023 | if (info->xmit.head == info->xmit.tail) { |
| 3024 | #if defined(CONFIG_ETRAX_RS485) && defined(CONFIG_ETRAX_FAST_TIMER) |
| 3025 | if (info->rs485.enabled) { |
| 3026 | /* Set a short timer to toggle RTS */ |
| 3027 | start_one_shot_timer(&fast_timers_rs485[info->line], |
| 3028 | rs485_toggle_rts_timer_function, |
| 3029 | (unsigned long)info, |
| 3030 | info->char_time_usec*2, |
| 3031 | "RS-485"); |
| 3032 | } |
| 3033 | #endif /* RS485 */ |
| 3034 | info->last_tx_active_usec = GET_JIFFIES_USEC(); |
| 3035 | info->last_tx_active = jiffies; |
| 3036 | e100_disable_serial_tx_ready_irq(info); |
| 3037 | info->tr_running = 0; |
| 3038 | DFLOW(DEBUG_LOG(info->line, "tx_int: stop2\n", 0)); |
| 3039 | } else { |
| 3040 | /* We must enable since it is disabled in ser_interrupt */ |
| 3041 | e100_enable_serial_tx_ready_irq(info); |
| 3042 | } |
| 3043 | restore_flags(flags); |
| 3044 | |
| 3045 | if (CIRC_CNT(info->xmit.head, |
| 3046 | info->xmit.tail, |
| 3047 | SERIAL_XMIT_SIZE) < WAKEUP_CHARS) |
| 3048 | rs_sched_event(info, RS_EVENT_WRITE_WAKEUP); |
| 3049 | |
| 3050 | } /* handle_ser_tx_interrupt */ |
| 3051 | |
| 3052 | /* result of time measurements: |
| 3053 | * RX duration 54-60 us when doing something, otherwise 6-9 us |
| 3054 | * ser_int duration: just sending: 8-15 us normally, up to 73 us |
| 3055 | */ |
| 3056 | static irqreturn_t |
| 3057 | ser_interrupt(int irq, void *dev_id, struct pt_regs *regs) |
| 3058 | { |
| 3059 | static volatile int tx_started = 0; |
| 3060 | struct e100_serial *info; |
| 3061 | int i; |
| 3062 | unsigned long flags; |
| 3063 | unsigned long irq_mask1_rd; |
| 3064 | unsigned long data_mask = (1 << (8+2*0)); /* ser0 data_avail */ |
| 3065 | int handled = 0; |
| 3066 | static volatile unsigned long reentered_ready_mask = 0; |
| 3067 | |
| 3068 | save_flags(flags); cli(); |
| 3069 | irq_mask1_rd = *R_IRQ_MASK1_RD; |
| 3070 | /* First handle all rx interrupts with ints disabled */ |
| 3071 | info = rs_table; |
| 3072 | irq_mask1_rd &= e100_ser_int_mask; |
| 3073 | for (i = 0; i < NR_PORTS; i++) { |
| 3074 | /* Which line caused the data irq? */ |
| 3075 | if (irq_mask1_rd & data_mask) { |
| 3076 | handled = 1; |
| 3077 | handle_ser_rx_interrupt(info); |
| 3078 | } |
| 3079 | info += 1; |
| 3080 | data_mask <<= 2; |
| 3081 | } |
| 3082 | /* Handle tx interrupts with interrupts enabled so we |
| 3083 | * can take care of new data interrupts while transmitting |
| 3084 | * We protect the tx part with the tx_started flag. |
| 3085 | * We disable the tr_ready interrupts we are about to handle and |
| 3086 | * unblock the serial interrupt so new serial interrupts may come. |
| 3087 | * |
| 3088 | * If we get a new interrupt: |
| 3089 | * - it migth be due to synchronous serial ports. |
| 3090 | * - serial irq will be blocked by general irq handler. |
| 3091 | * - async data will be handled above (sync will be ignored). |
| 3092 | * - tx_started flag will prevent us from trying to send again and |
| 3093 | * we will exit fast - no need to unblock serial irq. |
| 3094 | * - Next (sync) serial interrupt handler will be runned with |
| 3095 | * disabled interrupt due to restore_flags() at end of function, |
| 3096 | * so sync handler will not be preempted or reentered. |
| 3097 | */ |
| 3098 | if (!tx_started) { |
| 3099 | unsigned long ready_mask; |
| 3100 | unsigned long |
| 3101 | tx_started = 1; |
| 3102 | /* Only the tr_ready interrupts left */ |
| 3103 | irq_mask1_rd &= (IO_MASK(R_IRQ_MASK1_RD, ser0_ready) | |
| 3104 | IO_MASK(R_IRQ_MASK1_RD, ser1_ready) | |
| 3105 | IO_MASK(R_IRQ_MASK1_RD, ser2_ready) | |
| 3106 | IO_MASK(R_IRQ_MASK1_RD, ser3_ready)); |
| 3107 | while (irq_mask1_rd) { |
| 3108 | /* Disable those we are about to handle */ |
| 3109 | *R_IRQ_MASK1_CLR = irq_mask1_rd; |
| 3110 | /* Unblock the serial interrupt */ |
| 3111 | *R_VECT_MASK_SET = IO_STATE(R_VECT_MASK_SET, serial, set); |
| 3112 | |
| 3113 | sti(); |
| 3114 | ready_mask = (1 << (8+1+2*0)); /* ser0 tr_ready */ |
| 3115 | info = rs_table; |
| 3116 | for (i = 0; i < NR_PORTS; i++) { |
| 3117 | /* Which line caused the ready irq? */ |
| 3118 | if (irq_mask1_rd & ready_mask) { |
| 3119 | handled = 1; |
| 3120 | handle_ser_tx_interrupt(info); |
| 3121 | } |
| 3122 | info += 1; |
| 3123 | ready_mask <<= 2; |
| 3124 | } |
| 3125 | /* handle_ser_tx_interrupt enables tr_ready interrupts */ |
| 3126 | cli(); |
| 3127 | /* Handle reentered TX interrupt */ |
| 3128 | irq_mask1_rd = reentered_ready_mask; |
| 3129 | } |
| 3130 | cli(); |
| 3131 | tx_started = 0; |
| 3132 | } else { |
| 3133 | unsigned long ready_mask; |
| 3134 | ready_mask = irq_mask1_rd & (IO_MASK(R_IRQ_MASK1_RD, ser0_ready) | |
| 3135 | IO_MASK(R_IRQ_MASK1_RD, ser1_ready) | |
| 3136 | IO_MASK(R_IRQ_MASK1_RD, ser2_ready) | |
| 3137 | IO_MASK(R_IRQ_MASK1_RD, ser3_ready)); |
| 3138 | if (ready_mask) { |
| 3139 | reentered_ready_mask |= ready_mask; |
| 3140 | /* Disable those we are about to handle */ |
| 3141 | *R_IRQ_MASK1_CLR = ready_mask; |
| 3142 | DFLOW(DEBUG_LOG(SERIAL_DEBUG_LINE, "ser_int reentered with TX %X\n", ready_mask)); |
| 3143 | } |
| 3144 | } |
| 3145 | |
| 3146 | restore_flags(flags); |
| 3147 | return IRQ_RETVAL(handled); |
| 3148 | } /* ser_interrupt */ |
| 3149 | #endif |
| 3150 | |
| 3151 | /* |
| 3152 | * ------------------------------------------------------------------- |
| 3153 | * Here ends the serial interrupt routines. |
| 3154 | * ------------------------------------------------------------------- |
| 3155 | */ |
| 3156 | |
| 3157 | /* |
| 3158 | * This routine is used to handle the "bottom half" processing for the |
| 3159 | * serial driver, known also the "software interrupt" processing. |
| 3160 | * This processing is done at the kernel interrupt level, after the |
| 3161 | * rs_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON. This |
| 3162 | * is where time-consuming activities which can not be done in the |
| 3163 | * interrupt driver proper are done; the interrupt driver schedules |
| 3164 | * them using rs_sched_event(), and they get done here. |
| 3165 | */ |
| 3166 | static void |
| 3167 | do_softint(void *private_) |
| 3168 | { |
| 3169 | struct e100_serial *info = (struct e100_serial *) private_; |
| 3170 | struct tty_struct *tty; |
| 3171 | |
| 3172 | tty = info->tty; |
| 3173 | if (!tty) |
| 3174 | return; |
| 3175 | |
| 3176 | if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) { |
| 3177 | if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) && |
| 3178 | tty->ldisc.write_wakeup) |
| 3179 | (tty->ldisc.write_wakeup)(tty); |
| 3180 | wake_up_interruptible(&tty->write_wait); |
| 3181 | } |
| 3182 | } |
| 3183 | |
| 3184 | static int |
| 3185 | startup(struct e100_serial * info) |
| 3186 | { |
| 3187 | unsigned long flags; |
| 3188 | unsigned long xmit_page; |
| 3189 | int i; |
| 3190 | |
| 3191 | xmit_page = get_zeroed_page(GFP_KERNEL); |
| 3192 | if (!xmit_page) |
| 3193 | return -ENOMEM; |
| 3194 | |
| 3195 | save_flags(flags); |
| 3196 | cli(); |
| 3197 | |
| 3198 | /* if it was already initialized, skip this */ |
| 3199 | |
| 3200 | if (info->flags & ASYNC_INITIALIZED) { |
| 3201 | restore_flags(flags); |
| 3202 | free_page(xmit_page); |
| 3203 | return 0; |
| 3204 | } |
| 3205 | |
| 3206 | if (info->xmit.buf) |
| 3207 | free_page(xmit_page); |
| 3208 | else |
| 3209 | info->xmit.buf = (unsigned char *) xmit_page; |
| 3210 | |
| 3211 | #ifdef SERIAL_DEBUG_OPEN |
| 3212 | printk("starting up ttyS%d (xmit_buf 0x%p)...\n", info->line, info->xmit.buf); |
| 3213 | #endif |
| 3214 | |
| 3215 | #ifdef CONFIG_SVINTO_SIM |
| 3216 | /* Bits and pieces collected from below. Better to have them |
| 3217 | in one ifdef:ed clause than to mix in a lot of ifdefs, |
| 3218 | right? */ |
| 3219 | if (info->tty) |
| 3220 | clear_bit(TTY_IO_ERROR, &info->tty->flags); |
| 3221 | |
| 3222 | info->xmit.head = info->xmit.tail = 0; |
| 3223 | info->first_recv_buffer = info->last_recv_buffer = NULL; |
| 3224 | info->recv_cnt = info->max_recv_cnt = 0; |
| 3225 | |
| 3226 | for (i = 0; i < SERIAL_RECV_DESCRIPTORS; i++) |
| 3227 | info->rec_descr[i].buf = NULL; |
| 3228 | |
| 3229 | /* No real action in the simulator, but may set info important |
| 3230 | to ioctl. */ |
| 3231 | change_speed(info); |
| 3232 | #else |
| 3233 | |
| 3234 | /* |
| 3235 | * Clear the FIFO buffers and disable them |
| 3236 | * (they will be reenabled in change_speed()) |
| 3237 | */ |
| 3238 | |
| 3239 | /* |
| 3240 | * Reset the DMA channels and make sure their interrupts are cleared |
| 3241 | */ |
| 3242 | |
| 3243 | if (info->dma_in_enabled) { |
| 3244 | info->uses_dma_in = 1; |
| 3245 | e100_enable_rxdma_channel(info); |
| 3246 | |
| 3247 | *info->icmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, reset); |
| 3248 | |
| 3249 | /* Wait until reset cycle is complete */ |
| 3250 | while (IO_EXTRACT(R_DMA_CH6_CMD, cmd, *info->icmdadr) == |
| 3251 | IO_STATE_VALUE(R_DMA_CH6_CMD, cmd, reset)); |
| 3252 | |
| 3253 | /* Make sure the irqs are cleared */ |
| 3254 | *info->iclrintradr = |
| 3255 | IO_STATE(R_DMA_CH6_CLR_INTR, clr_descr, do) | |
| 3256 | IO_STATE(R_DMA_CH6_CLR_INTR, clr_eop, do); |
| 3257 | } else { |
| 3258 | e100_disable_rxdma_channel(info); |
| 3259 | } |
| 3260 | |
| 3261 | if (info->dma_out_enabled) { |
| 3262 | info->uses_dma_out = 1; |
| 3263 | e100_enable_txdma_channel(info); |
| 3264 | *info->ocmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, reset); |
| 3265 | |
| 3266 | while (IO_EXTRACT(R_DMA_CH6_CMD, cmd, *info->ocmdadr) == |
| 3267 | IO_STATE_VALUE(R_DMA_CH6_CMD, cmd, reset)); |
| 3268 | |
| 3269 | /* Make sure the irqs are cleared */ |
| 3270 | *info->oclrintradr = |
| 3271 | IO_STATE(R_DMA_CH6_CLR_INTR, clr_descr, do) | |
| 3272 | IO_STATE(R_DMA_CH6_CLR_INTR, clr_eop, do); |
| 3273 | } else { |
| 3274 | e100_disable_txdma_channel(info); |
| 3275 | } |
| 3276 | |
| 3277 | if (info->tty) |
| 3278 | clear_bit(TTY_IO_ERROR, &info->tty->flags); |
| 3279 | |
| 3280 | info->xmit.head = info->xmit.tail = 0; |
| 3281 | info->first_recv_buffer = info->last_recv_buffer = NULL; |
| 3282 | info->recv_cnt = info->max_recv_cnt = 0; |
| 3283 | |
| 3284 | for (i = 0; i < SERIAL_RECV_DESCRIPTORS; i++) |
| 3285 | info->rec_descr[i].buf = 0; |
| 3286 | |
| 3287 | /* |
| 3288 | * and set the speed and other flags of the serial port |
| 3289 | * this will start the rx/tx as well |
| 3290 | */ |
| 3291 | #ifdef SERIAL_HANDLE_EARLY_ERRORS |
| 3292 | e100_enable_serial_data_irq(info); |
| 3293 | #endif |
| 3294 | change_speed(info); |
| 3295 | |
| 3296 | /* dummy read to reset any serial errors */ |
| 3297 | |
| 3298 | (void)info->port[REG_DATA]; |
| 3299 | |
| 3300 | /* enable the interrupts */ |
| 3301 | if (info->uses_dma_out) |
| 3302 | e100_enable_txdma_irq(info); |
| 3303 | |
| 3304 | e100_enable_rx_irq(info); |
| 3305 | |
| 3306 | info->tr_running = 0; /* to be sure we don't lock up the transmitter */ |
| 3307 | |
| 3308 | /* setup the dma input descriptor and start dma */ |
| 3309 | |
| 3310 | start_receive(info); |
| 3311 | |
| 3312 | /* for safety, make sure the descriptors last result is 0 bytes written */ |
| 3313 | |
| 3314 | info->tr_descr.sw_len = 0; |
| 3315 | info->tr_descr.hw_len = 0; |
| 3316 | info->tr_descr.status = 0; |
| 3317 | |
| 3318 | /* enable RTS/DTR last */ |
| 3319 | |
| 3320 | e100_rts(info, 1); |
| 3321 | e100_dtr(info, 1); |
| 3322 | |
| 3323 | #endif /* CONFIG_SVINTO_SIM */ |
| 3324 | |
| 3325 | info->flags |= ASYNC_INITIALIZED; |
| 3326 | |
| 3327 | restore_flags(flags); |
| 3328 | return 0; |
| 3329 | } |
| 3330 | |
| 3331 | /* |
| 3332 | * This routine will shutdown a serial port; interrupts are disabled, and |
| 3333 | * DTR is dropped if the hangup on close termio flag is on. |
| 3334 | */ |
| 3335 | static void |
| 3336 | shutdown(struct e100_serial * info) |
| 3337 | { |
| 3338 | unsigned long flags; |
| 3339 | struct etrax_dma_descr *descr = info->rec_descr; |
| 3340 | struct etrax_recv_buffer *buffer; |
| 3341 | int i; |
| 3342 | |
| 3343 | #ifndef CONFIG_SVINTO_SIM |
| 3344 | /* shut down the transmitter and receiver */ |
| 3345 | DFLOW(DEBUG_LOG(info->line, "shutdown %i\n", info->line)); |
| 3346 | e100_disable_rx(info); |
| 3347 | info->port[REG_TR_CTRL] = (info->tx_ctrl &= ~0x40); |
| 3348 | |
| 3349 | /* disable interrupts, reset dma channels */ |
| 3350 | if (info->uses_dma_in) { |
| 3351 | e100_disable_rxdma_irq(info); |
| 3352 | *info->icmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, reset); |
| 3353 | info->uses_dma_in = 0; |
| 3354 | } else { |
| 3355 | e100_disable_serial_data_irq(info); |
| 3356 | } |
| 3357 | |
| 3358 | if (info->uses_dma_out) { |
| 3359 | e100_disable_txdma_irq(info); |
| 3360 | info->tr_running = 0; |
| 3361 | *info->ocmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, reset); |
| 3362 | info->uses_dma_out = 0; |
| 3363 | } else { |
| 3364 | e100_disable_serial_tx_ready_irq(info); |
| 3365 | info->tr_running = 0; |
| 3366 | } |
| 3367 | |
| 3368 | #endif /* CONFIG_SVINTO_SIM */ |
| 3369 | |
| 3370 | if (!(info->flags & ASYNC_INITIALIZED)) |
| 3371 | return; |
| 3372 | |
| 3373 | #ifdef SERIAL_DEBUG_OPEN |
| 3374 | printk("Shutting down serial port %d (irq %d)....\n", info->line, |
| 3375 | info->irq); |
| 3376 | #endif |
| 3377 | |
| 3378 | save_flags(flags); |
| 3379 | cli(); /* Disable interrupts */ |
| 3380 | |
| 3381 | if (info->xmit.buf) { |
| 3382 | free_page((unsigned long)info->xmit.buf); |
| 3383 | info->xmit.buf = NULL; |
| 3384 | } |
| 3385 | |
| 3386 | for (i = 0; i < SERIAL_RECV_DESCRIPTORS; i++) |
| 3387 | if (descr[i].buf) { |
| 3388 | buffer = phys_to_virt(descr[i].buf) - sizeof *buffer; |
| 3389 | kfree(buffer); |
| 3390 | descr[i].buf = 0; |
| 3391 | } |
| 3392 | |
| 3393 | if (!info->tty || (info->tty->termios->c_cflag & HUPCL)) { |
| 3394 | /* hang up DTR and RTS if HUPCL is enabled */ |
| 3395 | e100_dtr(info, 0); |
| 3396 | e100_rts(info, 0); /* could check CRTSCTS before doing this */ |
| 3397 | } |
| 3398 | |
| 3399 | if (info->tty) |
| 3400 | set_bit(TTY_IO_ERROR, &info->tty->flags); |
| 3401 | |
| 3402 | info->flags &= ~ASYNC_INITIALIZED; |
| 3403 | restore_flags(flags); |
| 3404 | } |
| 3405 | |
| 3406 | |
| 3407 | /* change baud rate and other assorted parameters */ |
| 3408 | |
| 3409 | static void |
| 3410 | change_speed(struct e100_serial *info) |
| 3411 | { |
| 3412 | unsigned int cflag; |
| 3413 | unsigned long xoff; |
| 3414 | unsigned long flags; |
| 3415 | /* first some safety checks */ |
| 3416 | |
| 3417 | if (!info->tty || !info->tty->termios) |
| 3418 | return; |
| 3419 | if (!info->port) |
| 3420 | return; |
| 3421 | |
| 3422 | cflag = info->tty->termios->c_cflag; |
| 3423 | |
| 3424 | /* possibly, the tx/rx should be disabled first to do this safely */ |
| 3425 | |
| 3426 | /* change baud-rate and write it to the hardware */ |
| 3427 | if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST) { |
| 3428 | /* Special baudrate */ |
| 3429 | u32 mask = 0xFF << (info->line*8); /* Each port has 8 bits */ |
| 3430 | unsigned long alt_source = |
| 3431 | IO_STATE(R_ALT_SER_BAUDRATE, ser0_rec, normal) | |
| 3432 | IO_STATE(R_ALT_SER_BAUDRATE, ser0_tr, normal); |
| 3433 | /* R_ALT_SER_BAUDRATE selects the source */ |
| 3434 | DBAUD(printk("Custom baudrate: baud_base/divisor %lu/%i\n", |
| 3435 | (unsigned long)info->baud_base, info->custom_divisor)); |
| 3436 | if (info->baud_base == SERIAL_PRESCALE_BASE) { |
| 3437 | /* 0, 2-65535 (0=65536) */ |
| 3438 | u16 divisor = info->custom_divisor; |
| 3439 | /* R_SERIAL_PRESCALE (upper 16 bits of R_CLOCK_PRESCALE) */ |
| 3440 | /* baudrate is 3.125MHz/custom_divisor */ |
| 3441 | alt_source = |
| 3442 | IO_STATE(R_ALT_SER_BAUDRATE, ser0_rec, prescale) | |
| 3443 | IO_STATE(R_ALT_SER_BAUDRATE, ser0_tr, prescale); |
| 3444 | alt_source = 0x11; |
| 3445 | DBAUD(printk("Writing SERIAL_PRESCALE: divisor %i\n", divisor)); |
| 3446 | *R_SERIAL_PRESCALE = divisor; |
| 3447 | info->baud = SERIAL_PRESCALE_BASE/divisor; |
| 3448 | } |
| 3449 | #ifdef CONFIG_ETRAX_EXTERN_PB6CLK_ENABLED |
| 3450 | else if ((info->baud_base==CONFIG_ETRAX_EXTERN_PB6CLK_FREQ/8 && |
| 3451 | info->custom_divisor == 1) || |
| 3452 | (info->baud_base==CONFIG_ETRAX_EXTERN_PB6CLK_FREQ && |
| 3453 | info->custom_divisor == 8)) { |
| 3454 | /* ext_clk selected */ |
| 3455 | alt_source = |
| 3456 | IO_STATE(R_ALT_SER_BAUDRATE, ser0_rec, extern) | |
| 3457 | IO_STATE(R_ALT_SER_BAUDRATE, ser0_tr, extern); |
| 3458 | DBAUD(printk("using external baudrate: %lu\n", CONFIG_ETRAX_EXTERN_PB6CLK_FREQ/8)); |
| 3459 | info->baud = CONFIG_ETRAX_EXTERN_PB6CLK_FREQ/8; |
| 3460 | } |
| 3461 | } |
| 3462 | #endif |
| 3463 | else |
| 3464 | { |
| 3465 | /* Bad baudbase, we don't support using timer0 |
| 3466 | * for baudrate. |
| 3467 | */ |
| 3468 | printk(KERN_WARNING "Bad baud_base/custom_divisor: %lu/%i\n", |
| 3469 | (unsigned long)info->baud_base, info->custom_divisor); |
| 3470 | } |
| 3471 | r_alt_ser_baudrate_shadow &= ~mask; |
| 3472 | r_alt_ser_baudrate_shadow |= (alt_source << (info->line*8)); |
| 3473 | *R_ALT_SER_BAUDRATE = r_alt_ser_baudrate_shadow; |
| 3474 | } else { |
| 3475 | /* Normal baudrate */ |
| 3476 | /* Make sure we use normal baudrate */ |
| 3477 | u32 mask = 0xFF << (info->line*8); /* Each port has 8 bits */ |
| 3478 | unsigned long alt_source = |
| 3479 | IO_STATE(R_ALT_SER_BAUDRATE, ser0_rec, normal) | |
| 3480 | IO_STATE(R_ALT_SER_BAUDRATE, ser0_tr, normal); |
| 3481 | r_alt_ser_baudrate_shadow &= ~mask; |
| 3482 | r_alt_ser_baudrate_shadow |= (alt_source << (info->line*8)); |
| 3483 | #ifndef CONFIG_SVINTO_SIM |
| 3484 | *R_ALT_SER_BAUDRATE = r_alt_ser_baudrate_shadow; |
| 3485 | #endif /* CONFIG_SVINTO_SIM */ |
| 3486 | |
| 3487 | info->baud = cflag_to_baud(cflag); |
| 3488 | #ifndef CONFIG_SVINTO_SIM |
| 3489 | info->port[REG_BAUD] = cflag_to_etrax_baud(cflag); |
| 3490 | #endif /* CONFIG_SVINTO_SIM */ |
| 3491 | } |
| 3492 | |
| 3493 | #ifndef CONFIG_SVINTO_SIM |
| 3494 | /* start with default settings and then fill in changes */ |
| 3495 | save_flags(flags); |
| 3496 | cli(); |
| 3497 | /* 8 bit, no/even parity */ |
| 3498 | info->rx_ctrl &= ~(IO_MASK(R_SERIAL0_REC_CTRL, rec_bitnr) | |
| 3499 | IO_MASK(R_SERIAL0_REC_CTRL, rec_par_en) | |
| 3500 | IO_MASK(R_SERIAL0_REC_CTRL, rec_par)); |
| 3501 | |
| 3502 | /* 8 bit, no/even parity, 1 stop bit, no cts */ |
| 3503 | info->tx_ctrl &= ~(IO_MASK(R_SERIAL0_TR_CTRL, tr_bitnr) | |
| 3504 | IO_MASK(R_SERIAL0_TR_CTRL, tr_par_en) | |
| 3505 | IO_MASK(R_SERIAL0_TR_CTRL, tr_par) | |
| 3506 | IO_MASK(R_SERIAL0_TR_CTRL, stop_bits) | |
| 3507 | IO_MASK(R_SERIAL0_TR_CTRL, auto_cts)); |
| 3508 | |
| 3509 | if ((cflag & CSIZE) == CS7) { |
| 3510 | /* set 7 bit mode */ |
| 3511 | info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, tr_bitnr, tr_7bit); |
| 3512 | info->rx_ctrl |= IO_STATE(R_SERIAL0_REC_CTRL, rec_bitnr, rec_7bit); |
| 3513 | } |
| 3514 | |
| 3515 | if (cflag & CSTOPB) { |
| 3516 | /* set 2 stop bit mode */ |
| 3517 | info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, stop_bits, two_bits); |
| 3518 | } |
| 3519 | |
| 3520 | if (cflag & PARENB) { |
| 3521 | /* enable parity */ |
| 3522 | info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, tr_par_en, enable); |
| 3523 | info->rx_ctrl |= IO_STATE(R_SERIAL0_REC_CTRL, rec_par_en, enable); |
| 3524 | } |
| 3525 | |
| 3526 | if (cflag & CMSPAR) { |
| 3527 | /* enable stick parity, PARODD mean Mark which matches ETRAX */ |
| 3528 | info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, tr_stick_par, stick); |
| 3529 | info->rx_ctrl |= IO_STATE(R_SERIAL0_REC_CTRL, rec_stick_par, stick); |
| 3530 | } |
| 3531 | if (cflag & PARODD) { |
| 3532 | /* set odd parity (or Mark if CMSPAR) */ |
| 3533 | info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, tr_par, odd); |
| 3534 | info->rx_ctrl |= IO_STATE(R_SERIAL0_REC_CTRL, rec_par, odd); |
| 3535 | } |
| 3536 | |
| 3537 | if (cflag & CRTSCTS) { |
| 3538 | /* enable automatic CTS handling */ |
| 3539 | DFLOW(DEBUG_LOG(info->line, "FLOW auto_cts enabled\n", 0)); |
| 3540 | info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, auto_cts, active); |
| 3541 | } |
| 3542 | |
| 3543 | /* make sure the tx and rx are enabled */ |
| 3544 | |
| 3545 | info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, tr_enable, enable); |
| 3546 | info->rx_ctrl |= IO_STATE(R_SERIAL0_REC_CTRL, rec_enable, enable); |
| 3547 | |
| 3548 | /* actually write the control regs to the hardware */ |
| 3549 | |
| 3550 | info->port[REG_TR_CTRL] = info->tx_ctrl; |
| 3551 | info->port[REG_REC_CTRL] = info->rx_ctrl; |
| 3552 | xoff = IO_FIELD(R_SERIAL0_XOFF, xoff_char, STOP_CHAR(info->tty)); |
| 3553 | xoff |= IO_STATE(R_SERIAL0_XOFF, tx_stop, enable); |
| 3554 | if (info->tty->termios->c_iflag & IXON ) { |
| 3555 | DFLOW(DEBUG_LOG(info->line, "FLOW XOFF enabled 0x%02X\n", STOP_CHAR(info->tty))); |
| 3556 | xoff |= IO_STATE(R_SERIAL0_XOFF, auto_xoff, enable); |
| 3557 | } |
| 3558 | |
| 3559 | *((unsigned long *)&info->port[REG_XOFF]) = xoff; |
| 3560 | restore_flags(flags); |
| 3561 | #endif /* !CONFIG_SVINTO_SIM */ |
| 3562 | |
| 3563 | update_char_time(info); |
| 3564 | |
| 3565 | } /* change_speed */ |
| 3566 | |
| 3567 | /* start transmitting chars NOW */ |
| 3568 | |
| 3569 | static void |
| 3570 | rs_flush_chars(struct tty_struct *tty) |
| 3571 | { |
| 3572 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; |
| 3573 | unsigned long flags; |
| 3574 | |
| 3575 | if (info->tr_running || |
| 3576 | info->xmit.head == info->xmit.tail || |
| 3577 | tty->stopped || |
| 3578 | tty->hw_stopped || |
| 3579 | !info->xmit.buf) |
| 3580 | return; |
| 3581 | |
| 3582 | #ifdef SERIAL_DEBUG_FLOW |
| 3583 | printk("rs_flush_chars\n"); |
| 3584 | #endif |
| 3585 | |
| 3586 | /* this protection might not exactly be necessary here */ |
| 3587 | |
| 3588 | save_flags(flags); |
| 3589 | cli(); |
| 3590 | start_transmit(info); |
| 3591 | restore_flags(flags); |
| 3592 | } |
| 3593 | |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 3594 | static int rs_raw_write(struct tty_struct * tty, int from_user, |
| 3595 | const unsigned char *buf, int count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3596 | { |
| 3597 | int c, ret = 0; |
| 3598 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; |
| 3599 | unsigned long flags; |
| 3600 | |
| 3601 | /* first some sanity checks */ |
| 3602 | |
| 3603 | if (!tty || !info->xmit.buf || !tmp_buf) |
| 3604 | return 0; |
| 3605 | |
| 3606 | #ifdef SERIAL_DEBUG_DATA |
| 3607 | if (info->line == SERIAL_DEBUG_LINE) |
| 3608 | printk("rs_raw_write (%d), status %d\n", |
| 3609 | count, info->port[REG_STATUS]); |
| 3610 | #endif |
| 3611 | |
| 3612 | #ifdef CONFIG_SVINTO_SIM |
| 3613 | /* Really simple. The output is here and now. */ |
| 3614 | SIMCOUT(buf, count); |
| 3615 | return count; |
| 3616 | #endif |
| 3617 | save_flags(flags); |
| 3618 | DFLOW(DEBUG_LOG(info->line, "write count %i ", count)); |
| 3619 | DFLOW(DEBUG_LOG(info->line, "ldisc %i\n", tty->ldisc.chars_in_buffer(tty))); |
| 3620 | |
| 3621 | |
| 3622 | /* the cli/restore_flags pairs below are needed because the |
| 3623 | * DMA interrupt handler moves the info->xmit values. the memcpy |
| 3624 | * needs to be in the critical region unfortunately, because we |
| 3625 | * need to read xmit values, memcpy, write xmit values in one |
| 3626 | * atomic operation... this could perhaps be avoided by more clever |
| 3627 | * design. |
| 3628 | */ |
| 3629 | if (from_user) { |
Arjan van de Ven | f392ecf | 2006-01-12 18:44:32 +0000 | [diff] [blame] | 3630 | mutex_lock(&tmp_buf_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3631 | while (1) { |
| 3632 | int c1; |
| 3633 | c = CIRC_SPACE_TO_END(info->xmit.head, |
| 3634 | info->xmit.tail, |
| 3635 | SERIAL_XMIT_SIZE); |
| 3636 | if (count < c) |
| 3637 | c = count; |
| 3638 | if (c <= 0) |
| 3639 | break; |
| 3640 | |
| 3641 | c -= copy_from_user(tmp_buf, buf, c); |
| 3642 | if (!c) { |
| 3643 | if (!ret) |
| 3644 | ret = -EFAULT; |
| 3645 | break; |
| 3646 | } |
| 3647 | cli(); |
| 3648 | c1 = CIRC_SPACE_TO_END(info->xmit.head, |
| 3649 | info->xmit.tail, |
| 3650 | SERIAL_XMIT_SIZE); |
| 3651 | if (c1 < c) |
| 3652 | c = c1; |
| 3653 | memcpy(info->xmit.buf + info->xmit.head, tmp_buf, c); |
| 3654 | info->xmit.head = ((info->xmit.head + c) & |
| 3655 | (SERIAL_XMIT_SIZE-1)); |
| 3656 | restore_flags(flags); |
| 3657 | buf += c; |
| 3658 | count -= c; |
| 3659 | ret += c; |
| 3660 | } |
Arjan van de Ven | f392ecf | 2006-01-12 18:44:32 +0000 | [diff] [blame] | 3661 | mutex_unlock(&tmp_buf_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3662 | } else { |
| 3663 | cli(); |
| 3664 | while (count) { |
| 3665 | c = CIRC_SPACE_TO_END(info->xmit.head, |
| 3666 | info->xmit.tail, |
| 3667 | SERIAL_XMIT_SIZE); |
| 3668 | |
| 3669 | if (count < c) |
| 3670 | c = count; |
| 3671 | if (c <= 0) |
| 3672 | break; |
| 3673 | |
| 3674 | memcpy(info->xmit.buf + info->xmit.head, buf, c); |
| 3675 | info->xmit.head = (info->xmit.head + c) & |
| 3676 | (SERIAL_XMIT_SIZE-1); |
| 3677 | buf += c; |
| 3678 | count -= c; |
| 3679 | ret += c; |
| 3680 | } |
| 3681 | restore_flags(flags); |
| 3682 | } |
| 3683 | |
| 3684 | /* enable transmitter if not running, unless the tty is stopped |
| 3685 | * this does not need IRQ protection since if tr_running == 0 |
| 3686 | * the IRQ's are not running anyway for this port. |
| 3687 | */ |
| 3688 | DFLOW(DEBUG_LOG(info->line, "write ret %i\n", ret)); |
| 3689 | |
| 3690 | if (info->xmit.head != info->xmit.tail && |
| 3691 | !tty->stopped && |
| 3692 | !tty->hw_stopped && |
| 3693 | !info->tr_running) { |
| 3694 | start_transmit(info); |
| 3695 | } |
| 3696 | |
| 3697 | return ret; |
| 3698 | } /* raw_raw_write() */ |
| 3699 | |
| 3700 | static int |
| 3701 | rs_write(struct tty_struct * tty, int from_user, |
| 3702 | const unsigned char *buf, int count) |
| 3703 | { |
| 3704 | #if defined(CONFIG_ETRAX_RS485) |
| 3705 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; |
| 3706 | |
| 3707 | if (info->rs485.enabled) |
| 3708 | { |
| 3709 | /* If we are in RS-485 mode, we need to toggle RTS and disable |
| 3710 | * the receiver before initiating a DMA transfer |
| 3711 | */ |
| 3712 | #ifdef CONFIG_ETRAX_FAST_TIMER |
| 3713 | /* Abort any started timer */ |
| 3714 | fast_timers_rs485[info->line].function = NULL; |
| 3715 | del_fast_timer(&fast_timers_rs485[info->line]); |
| 3716 | #endif |
| 3717 | e100_rts(info, info->rs485.rts_on_send); |
| 3718 | #if defined(CONFIG_ETRAX_RS485_DISABLE_RECEIVER) |
| 3719 | e100_disable_rx(info); |
| 3720 | e100_enable_rx_irq(info); |
| 3721 | #endif |
| 3722 | |
| 3723 | if (info->rs485.delay_rts_before_send > 0) |
| 3724 | msleep(info->rs485.delay_rts_before_send); |
| 3725 | } |
| 3726 | #endif /* CONFIG_ETRAX_RS485 */ |
| 3727 | |
| 3728 | count = rs_raw_write(tty, from_user, buf, count); |
| 3729 | |
| 3730 | #if defined(CONFIG_ETRAX_RS485) |
| 3731 | if (info->rs485.enabled) |
| 3732 | { |
| 3733 | unsigned int val; |
| 3734 | /* If we are in RS-485 mode the following has to be done: |
| 3735 | * wait until DMA is ready |
| 3736 | * wait on transmit shift register |
| 3737 | * toggle RTS |
| 3738 | * enable the receiver |
| 3739 | */ |
| 3740 | |
| 3741 | /* Sleep until all sent */ |
| 3742 | tty_wait_until_sent(tty, 0); |
| 3743 | #ifdef CONFIG_ETRAX_FAST_TIMER |
| 3744 | /* Now sleep a little more so that shift register is empty */ |
| 3745 | schedule_usleep(info->char_time_usec * 2); |
| 3746 | #endif |
| 3747 | /* wait on transmit shift register */ |
| 3748 | do{ |
| 3749 | get_lsr_info(info, &val); |
| 3750 | }while (!(val & TIOCSER_TEMT)); |
| 3751 | |
| 3752 | e100_rts(info, info->rs485.rts_after_sent); |
| 3753 | |
| 3754 | #if defined(CONFIG_ETRAX_RS485_DISABLE_RECEIVER) |
| 3755 | e100_enable_rx(info); |
| 3756 | e100_enable_rxdma_irq(info); |
| 3757 | #endif |
| 3758 | } |
| 3759 | #endif /* CONFIG_ETRAX_RS485 */ |
| 3760 | |
| 3761 | return count; |
| 3762 | } /* rs_write */ |
| 3763 | |
| 3764 | |
| 3765 | /* how much space is available in the xmit buffer? */ |
| 3766 | |
| 3767 | static int |
| 3768 | rs_write_room(struct tty_struct *tty) |
| 3769 | { |
| 3770 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; |
| 3771 | |
| 3772 | return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); |
| 3773 | } |
| 3774 | |
| 3775 | /* How many chars are in the xmit buffer? |
| 3776 | * This does not include any chars in the transmitter FIFO. |
| 3777 | * Use wait_until_sent for waiting for FIFO drain. |
| 3778 | */ |
| 3779 | |
| 3780 | static int |
| 3781 | rs_chars_in_buffer(struct tty_struct *tty) |
| 3782 | { |
| 3783 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; |
| 3784 | |
| 3785 | return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); |
| 3786 | } |
| 3787 | |
| 3788 | /* discard everything in the xmit buffer */ |
| 3789 | |
| 3790 | static void |
| 3791 | rs_flush_buffer(struct tty_struct *tty) |
| 3792 | { |
| 3793 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; |
| 3794 | unsigned long flags; |
| 3795 | |
| 3796 | save_flags(flags); |
| 3797 | cli(); |
| 3798 | info->xmit.head = info->xmit.tail = 0; |
| 3799 | restore_flags(flags); |
| 3800 | |
| 3801 | wake_up_interruptible(&tty->write_wait); |
| 3802 | |
| 3803 | if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) && |
| 3804 | tty->ldisc.write_wakeup) |
| 3805 | (tty->ldisc.write_wakeup)(tty); |
| 3806 | } |
| 3807 | |
| 3808 | /* |
| 3809 | * This function is used to send a high-priority XON/XOFF character to |
| 3810 | * the device |
| 3811 | * |
| 3812 | * Since we use DMA we don't check for info->x_char in transmit_chars_dma(), |
| 3813 | * but we do it in handle_ser_tx_interrupt(). |
| 3814 | * We disable DMA channel and enable tx ready interrupt and write the |
| 3815 | * character when possible. |
| 3816 | */ |
| 3817 | static void rs_send_xchar(struct tty_struct *tty, char ch) |
| 3818 | { |
| 3819 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; |
| 3820 | unsigned long flags; |
| 3821 | save_flags(flags); cli(); |
| 3822 | if (info->uses_dma_out) { |
| 3823 | /* Put the DMA on hold and disable the channel */ |
| 3824 | *info->ocmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, hold); |
| 3825 | while (IO_EXTRACT(R_DMA_CH6_CMD, cmd, *info->ocmdadr) != |
| 3826 | IO_STATE_VALUE(R_DMA_CH6_CMD, cmd, hold)); |
| 3827 | e100_disable_txdma_channel(info); |
| 3828 | } |
| 3829 | |
| 3830 | /* Must make sure transmitter is not stopped before we can transmit */ |
| 3831 | if (tty->stopped) |
| 3832 | rs_start(tty); |
| 3833 | |
| 3834 | /* Enable manual transmit interrupt and send from there */ |
| 3835 | DFLOW(DEBUG_LOG(info->line, "rs_send_xchar 0x%02X\n", ch)); |
| 3836 | info->x_char = ch; |
| 3837 | e100_enable_serial_tx_ready_irq(info); |
| 3838 | restore_flags(flags); |
| 3839 | } |
| 3840 | |
| 3841 | /* |
| 3842 | * ------------------------------------------------------------ |
| 3843 | * rs_throttle() |
| 3844 | * |
| 3845 | * This routine is called by the upper-layer tty layer to signal that |
| 3846 | * incoming characters should be throttled. |
| 3847 | * ------------------------------------------------------------ |
| 3848 | */ |
| 3849 | static void |
| 3850 | rs_throttle(struct tty_struct * tty) |
| 3851 | { |
| 3852 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; |
| 3853 | #ifdef SERIAL_DEBUG_THROTTLE |
| 3854 | char buf[64]; |
| 3855 | |
| 3856 | printk("throttle %s: %lu....\n", tty_name(tty, buf), |
| 3857 | (unsigned long)tty->ldisc.chars_in_buffer(tty)); |
| 3858 | #endif |
| 3859 | DFLOW(DEBUG_LOG(info->line,"rs_throttle %lu\n", tty->ldisc.chars_in_buffer(tty))); |
| 3860 | |
| 3861 | /* Do RTS before XOFF since XOFF might take some time */ |
| 3862 | if (tty->termios->c_cflag & CRTSCTS) { |
| 3863 | /* Turn off RTS line */ |
| 3864 | e100_rts(info, 0); |
| 3865 | } |
| 3866 | if (I_IXOFF(tty)) |
| 3867 | rs_send_xchar(tty, STOP_CHAR(tty)); |
| 3868 | |
| 3869 | } |
| 3870 | |
| 3871 | static void |
| 3872 | rs_unthrottle(struct tty_struct * tty) |
| 3873 | { |
| 3874 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; |
| 3875 | #ifdef SERIAL_DEBUG_THROTTLE |
| 3876 | char buf[64]; |
| 3877 | |
| 3878 | printk("unthrottle %s: %lu....\n", tty_name(tty, buf), |
| 3879 | (unsigned long)tty->ldisc.chars_in_buffer(tty)); |
| 3880 | #endif |
| 3881 | DFLOW(DEBUG_LOG(info->line,"rs_unthrottle ldisc %d\n", tty->ldisc.chars_in_buffer(tty))); |
| 3882 | DFLOW(DEBUG_LOG(info->line,"rs_unthrottle flip.count: %i\n", tty->flip.count)); |
| 3883 | /* Do RTS before XOFF since XOFF might take some time */ |
| 3884 | if (tty->termios->c_cflag & CRTSCTS) { |
| 3885 | /* Assert RTS line */ |
| 3886 | e100_rts(info, 1); |
| 3887 | } |
| 3888 | |
| 3889 | if (I_IXOFF(tty)) { |
| 3890 | if (info->x_char) |
| 3891 | info->x_char = 0; |
| 3892 | else |
| 3893 | rs_send_xchar(tty, START_CHAR(tty)); |
| 3894 | } |
| 3895 | |
| 3896 | } |
| 3897 | |
| 3898 | /* |
| 3899 | * ------------------------------------------------------------ |
| 3900 | * rs_ioctl() and friends |
| 3901 | * ------------------------------------------------------------ |
| 3902 | */ |
| 3903 | |
| 3904 | static int |
| 3905 | get_serial_info(struct e100_serial * info, |
| 3906 | struct serial_struct * retinfo) |
| 3907 | { |
| 3908 | struct serial_struct tmp; |
| 3909 | |
| 3910 | /* this is all probably wrong, there are a lot of fields |
| 3911 | * here that we don't have in e100_serial and maybe we |
| 3912 | * should set them to something else than 0. |
| 3913 | */ |
| 3914 | |
| 3915 | if (!retinfo) |
| 3916 | return -EFAULT; |
| 3917 | memset(&tmp, 0, sizeof(tmp)); |
| 3918 | tmp.type = info->type; |
| 3919 | tmp.line = info->line; |
| 3920 | tmp.port = (int)info->port; |
| 3921 | tmp.irq = info->irq; |
| 3922 | tmp.flags = info->flags; |
| 3923 | tmp.baud_base = info->baud_base; |
| 3924 | tmp.close_delay = info->close_delay; |
| 3925 | tmp.closing_wait = info->closing_wait; |
| 3926 | tmp.custom_divisor = info->custom_divisor; |
| 3927 | if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) |
| 3928 | return -EFAULT; |
| 3929 | return 0; |
| 3930 | } |
| 3931 | |
| 3932 | static int |
| 3933 | set_serial_info(struct e100_serial *info, |
| 3934 | struct serial_struct *new_info) |
| 3935 | { |
| 3936 | struct serial_struct new_serial; |
| 3937 | struct e100_serial old_info; |
| 3938 | int retval = 0; |
| 3939 | |
| 3940 | if (copy_from_user(&new_serial, new_info, sizeof(new_serial))) |
| 3941 | return -EFAULT; |
| 3942 | |
| 3943 | old_info = *info; |
| 3944 | |
| 3945 | if (!capable(CAP_SYS_ADMIN)) { |
| 3946 | if ((new_serial.type != info->type) || |
| 3947 | (new_serial.close_delay != info->close_delay) || |
| 3948 | ((new_serial.flags & ~ASYNC_USR_MASK) != |
| 3949 | (info->flags & ~ASYNC_USR_MASK))) |
| 3950 | return -EPERM; |
| 3951 | info->flags = ((info->flags & ~ASYNC_USR_MASK) | |
| 3952 | (new_serial.flags & ASYNC_USR_MASK)); |
| 3953 | goto check_and_exit; |
| 3954 | } |
| 3955 | |
| 3956 | if (info->count > 1) |
| 3957 | return -EBUSY; |
| 3958 | |
| 3959 | /* |
| 3960 | * OK, past this point, all the error checking has been done. |
| 3961 | * At this point, we start making changes..... |
| 3962 | */ |
| 3963 | |
| 3964 | info->baud_base = new_serial.baud_base; |
| 3965 | info->flags = ((info->flags & ~ASYNC_FLAGS) | |
| 3966 | (new_serial.flags & ASYNC_FLAGS)); |
| 3967 | info->custom_divisor = new_serial.custom_divisor; |
| 3968 | info->type = new_serial.type; |
| 3969 | info->close_delay = new_serial.close_delay; |
| 3970 | info->closing_wait = new_serial.closing_wait; |
| 3971 | info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0; |
| 3972 | |
| 3973 | check_and_exit: |
| 3974 | if (info->flags & ASYNC_INITIALIZED) { |
| 3975 | change_speed(info); |
| 3976 | } else |
| 3977 | retval = startup(info); |
| 3978 | return retval; |
| 3979 | } |
| 3980 | |
| 3981 | /* |
| 3982 | * get_lsr_info - get line status register info |
| 3983 | * |
| 3984 | * Purpose: Let user call ioctl() to get info when the UART physically |
| 3985 | * is emptied. On bus types like RS485, the transmitter must |
| 3986 | * release the bus after transmitting. This must be done when |
| 3987 | * the transmit shift register is empty, not be done when the |
| 3988 | * transmit holding register is empty. This functionality |
| 3989 | * allows an RS485 driver to be written in user space. |
| 3990 | */ |
| 3991 | static int |
| 3992 | get_lsr_info(struct e100_serial * info, unsigned int *value) |
| 3993 | { |
| 3994 | unsigned int result = TIOCSER_TEMT; |
| 3995 | #ifndef CONFIG_SVINTO_SIM |
| 3996 | unsigned long curr_time = jiffies; |
| 3997 | unsigned long curr_time_usec = GET_JIFFIES_USEC(); |
| 3998 | unsigned long elapsed_usec = |
| 3999 | (curr_time - info->last_tx_active) * 1000000/HZ + |
| 4000 | curr_time_usec - info->last_tx_active_usec; |
| 4001 | |
| 4002 | if (info->xmit.head != info->xmit.tail || |
| 4003 | elapsed_usec < 2*info->char_time_usec) { |
| 4004 | result = 0; |
| 4005 | } |
| 4006 | #endif |
| 4007 | |
| 4008 | if (copy_to_user(value, &result, sizeof(int))) |
| 4009 | return -EFAULT; |
| 4010 | return 0; |
| 4011 | } |
| 4012 | |
| 4013 | #ifdef SERIAL_DEBUG_IO |
| 4014 | struct state_str |
| 4015 | { |
| 4016 | int state; |
| 4017 | const char *str; |
| 4018 | }; |
| 4019 | |
| 4020 | const struct state_str control_state_str[] = { |
| 4021 | {TIOCM_DTR, "DTR" }, |
| 4022 | {TIOCM_RTS, "RTS"}, |
| 4023 | {TIOCM_ST, "ST?" }, |
| 4024 | {TIOCM_SR, "SR?" }, |
| 4025 | {TIOCM_CTS, "CTS" }, |
| 4026 | {TIOCM_CD, "CD" }, |
| 4027 | {TIOCM_RI, "RI" }, |
| 4028 | {TIOCM_DSR, "DSR" }, |
| 4029 | {0, NULL } |
| 4030 | }; |
| 4031 | |
| 4032 | char *get_control_state_str(int MLines, char *s) |
| 4033 | { |
| 4034 | int i = 0; |
| 4035 | |
| 4036 | s[0]='\0'; |
| 4037 | while (control_state_str[i].str != NULL) { |
| 4038 | if (MLines & control_state_str[i].state) { |
| 4039 | if (s[0] != '\0') { |
| 4040 | strcat(s, ", "); |
| 4041 | } |
| 4042 | strcat(s, control_state_str[i].str); |
| 4043 | } |
| 4044 | i++; |
| 4045 | } |
| 4046 | return s; |
| 4047 | } |
| 4048 | #endif |
| 4049 | |
| 4050 | static int |
| 4051 | get_modem_info(struct e100_serial * info, unsigned int *value) |
| 4052 | { |
| 4053 | unsigned int result; |
| 4054 | /* Polarity isn't verified */ |
| 4055 | #if 0 /*def SERIAL_DEBUG_IO */ |
| 4056 | |
| 4057 | printk("get_modem_info: RTS: %i DTR: %i CD: %i RI: %i DSR: %i CTS: %i\n", |
| 4058 | E100_RTS_GET(info), |
| 4059 | E100_DTR_GET(info), |
| 4060 | E100_CD_GET(info), |
| 4061 | E100_RI_GET(info), |
| 4062 | E100_DSR_GET(info), |
| 4063 | E100_CTS_GET(info)); |
| 4064 | #endif |
| 4065 | |
| 4066 | result = |
| 4067 | (!E100_RTS_GET(info) ? TIOCM_RTS : 0) |
| 4068 | | (!E100_DTR_GET(info) ? TIOCM_DTR : 0) |
| 4069 | | (!E100_RI_GET(info) ? TIOCM_RNG : 0) |
| 4070 | | (!E100_DSR_GET(info) ? TIOCM_DSR : 0) |
| 4071 | | (!E100_CD_GET(info) ? TIOCM_CAR : 0) |
| 4072 | | (!E100_CTS_GET(info) ? TIOCM_CTS : 0); |
| 4073 | |
| 4074 | #ifdef SERIAL_DEBUG_IO |
| 4075 | printk("e100ser: modem state: %i 0x%08X\n", result, result); |
| 4076 | { |
| 4077 | char s[100]; |
| 4078 | |
| 4079 | get_control_state_str(result, s); |
| 4080 | printk("state: %s\n", s); |
| 4081 | } |
| 4082 | #endif |
| 4083 | if (copy_to_user(value, &result, sizeof(int))) |
| 4084 | return -EFAULT; |
| 4085 | return 0; |
| 4086 | } |
| 4087 | |
| 4088 | |
| 4089 | static int |
| 4090 | set_modem_info(struct e100_serial * info, unsigned int cmd, |
| 4091 | unsigned int *value) |
| 4092 | { |
| 4093 | unsigned int arg; |
| 4094 | |
| 4095 | if (copy_from_user(&arg, value, sizeof(int))) |
| 4096 | return -EFAULT; |
| 4097 | |
| 4098 | switch (cmd) { |
| 4099 | case TIOCMBIS: |
| 4100 | if (arg & TIOCM_RTS) { |
| 4101 | e100_rts(info, 1); |
| 4102 | } |
| 4103 | if (arg & TIOCM_DTR) { |
| 4104 | e100_dtr(info, 1); |
| 4105 | } |
| 4106 | /* Handle FEMALE behaviour */ |
| 4107 | if (arg & TIOCM_RI) { |
| 4108 | e100_ri_out(info, 1); |
| 4109 | } |
| 4110 | if (arg & TIOCM_CD) { |
| 4111 | e100_cd_out(info, 1); |
| 4112 | } |
| 4113 | break; |
| 4114 | case TIOCMBIC: |
| 4115 | if (arg & TIOCM_RTS) { |
| 4116 | e100_rts(info, 0); |
| 4117 | } |
| 4118 | if (arg & TIOCM_DTR) { |
| 4119 | e100_dtr(info, 0); |
| 4120 | } |
| 4121 | /* Handle FEMALE behaviour */ |
| 4122 | if (arg & TIOCM_RI) { |
| 4123 | e100_ri_out(info, 0); |
| 4124 | } |
| 4125 | if (arg & TIOCM_CD) { |
| 4126 | e100_cd_out(info, 0); |
| 4127 | } |
| 4128 | break; |
| 4129 | case TIOCMSET: |
| 4130 | e100_rts(info, arg & TIOCM_RTS); |
| 4131 | e100_dtr(info, arg & TIOCM_DTR); |
| 4132 | /* Handle FEMALE behaviour */ |
| 4133 | e100_ri_out(info, arg & TIOCM_RI); |
| 4134 | e100_cd_out(info, arg & TIOCM_CD); |
| 4135 | break; |
| 4136 | default: |
| 4137 | return -EINVAL; |
| 4138 | } |
| 4139 | return 0; |
| 4140 | } |
| 4141 | |
| 4142 | |
| 4143 | static void |
| 4144 | rs_break(struct tty_struct *tty, int break_state) |
| 4145 | { |
| 4146 | struct e100_serial * info = (struct e100_serial *)tty->driver_data; |
| 4147 | unsigned long flags; |
| 4148 | |
| 4149 | if (!info->port) |
| 4150 | return; |
| 4151 | |
| 4152 | save_flags(flags); |
| 4153 | cli(); |
| 4154 | if (break_state == -1) { |
| 4155 | /* Go to manual mode and set the txd pin to 0 */ |
| 4156 | info->tx_ctrl &= 0x3F; /* Clear bit 7 (txd) and 6 (tr_enable) */ |
| 4157 | } else { |
| 4158 | info->tx_ctrl |= (0x80 | 0x40); /* Set bit 7 (txd) and 6 (tr_enable) */ |
| 4159 | } |
| 4160 | info->port[REG_TR_CTRL] = info->tx_ctrl; |
| 4161 | restore_flags(flags); |
| 4162 | } |
| 4163 | |
| 4164 | static int |
| 4165 | rs_ioctl(struct tty_struct *tty, struct file * file, |
| 4166 | unsigned int cmd, unsigned long arg) |
| 4167 | { |
| 4168 | struct e100_serial * info = (struct e100_serial *)tty->driver_data; |
| 4169 | |
| 4170 | if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) && |
| 4171 | (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) && |
| 4172 | (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) { |
| 4173 | if (tty->flags & (1 << TTY_IO_ERROR)) |
| 4174 | return -EIO; |
| 4175 | } |
| 4176 | |
| 4177 | switch (cmd) { |
| 4178 | case TIOCMGET: |
| 4179 | return get_modem_info(info, (unsigned int *) arg); |
| 4180 | case TIOCMBIS: |
| 4181 | case TIOCMBIC: |
| 4182 | case TIOCMSET: |
| 4183 | return set_modem_info(info, cmd, (unsigned int *) arg); |
| 4184 | case TIOCGSERIAL: |
| 4185 | return get_serial_info(info, |
| 4186 | (struct serial_struct *) arg); |
| 4187 | case TIOCSSERIAL: |
| 4188 | return set_serial_info(info, |
| 4189 | (struct serial_struct *) arg); |
| 4190 | case TIOCSERGETLSR: /* Get line status register */ |
| 4191 | return get_lsr_info(info, (unsigned int *) arg); |
| 4192 | |
| 4193 | case TIOCSERGSTRUCT: |
| 4194 | if (copy_to_user((struct e100_serial *) arg, |
| 4195 | info, sizeof(struct e100_serial))) |
| 4196 | return -EFAULT; |
| 4197 | return 0; |
| 4198 | |
| 4199 | #if defined(CONFIG_ETRAX_RS485) |
| 4200 | case TIOCSERSETRS485: |
| 4201 | { |
| 4202 | struct rs485_control rs485ctrl; |
| 4203 | if (copy_from_user(&rs485ctrl, (struct rs485_control*)arg, sizeof(rs485ctrl))) |
| 4204 | return -EFAULT; |
| 4205 | |
| 4206 | return e100_enable_rs485(tty, &rs485ctrl); |
| 4207 | } |
| 4208 | |
| 4209 | case TIOCSERWRRS485: |
| 4210 | { |
| 4211 | struct rs485_write rs485wr; |
| 4212 | if (copy_from_user(&rs485wr, (struct rs485_write*)arg, sizeof(rs485wr))) |
| 4213 | return -EFAULT; |
| 4214 | |
| 4215 | return e100_write_rs485(tty, 1, rs485wr.outc, rs485wr.outc_size); |
| 4216 | } |
| 4217 | #endif |
| 4218 | |
| 4219 | default: |
| 4220 | return -ENOIOCTLCMD; |
| 4221 | } |
| 4222 | return 0; |
| 4223 | } |
| 4224 | |
| 4225 | static void |
| 4226 | rs_set_termios(struct tty_struct *tty, struct termios *old_termios) |
| 4227 | { |
| 4228 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; |
| 4229 | |
| 4230 | if (tty->termios->c_cflag == old_termios->c_cflag && |
| 4231 | tty->termios->c_iflag == old_termios->c_iflag) |
| 4232 | return; |
| 4233 | |
| 4234 | change_speed(info); |
| 4235 | |
| 4236 | /* Handle turning off CRTSCTS */ |
| 4237 | if ((old_termios->c_cflag & CRTSCTS) && |
| 4238 | !(tty->termios->c_cflag & CRTSCTS)) { |
| 4239 | tty->hw_stopped = 0; |
| 4240 | rs_start(tty); |
| 4241 | } |
| 4242 | |
| 4243 | } |
| 4244 | |
| 4245 | /* In debugport.c - register a console write function that uses the normal |
| 4246 | * serial driver |
| 4247 | */ |
| 4248 | typedef int (*debugport_write_function)(int i, const char *buf, unsigned int len); |
| 4249 | |
| 4250 | extern debugport_write_function debug_write_function; |
| 4251 | |
| 4252 | static int rs_debug_write_function(int i, const char *buf, unsigned int len) |
| 4253 | { |
| 4254 | int cnt; |
| 4255 | int written = 0; |
| 4256 | struct tty_struct *tty; |
| 4257 | static int recurse_cnt = 0; |
| 4258 | |
| 4259 | tty = rs_table[i].tty; |
| 4260 | if (tty) { |
| 4261 | unsigned long flags; |
| 4262 | if (recurse_cnt > 5) /* We skip this debug output */ |
| 4263 | return 1; |
| 4264 | |
| 4265 | local_irq_save(flags); |
| 4266 | recurse_cnt++; |
| 4267 | local_irq_restore(flags); |
| 4268 | do { |
| 4269 | cnt = rs_write(tty, 0, buf + written, len); |
| 4270 | if (cnt >= 0) { |
| 4271 | written += cnt; |
| 4272 | buf += cnt; |
| 4273 | len -= cnt; |
| 4274 | } else |
| 4275 | len = cnt; |
| 4276 | } while(len > 0); |
| 4277 | local_irq_save(flags); |
| 4278 | recurse_cnt--; |
| 4279 | local_irq_restore(flags); |
| 4280 | return 1; |
| 4281 | } |
| 4282 | return 0; |
| 4283 | } |
| 4284 | |
| 4285 | /* |
| 4286 | * ------------------------------------------------------------ |
| 4287 | * rs_close() |
| 4288 | * |
| 4289 | * This routine is called when the serial port gets closed. First, we |
| 4290 | * wait for the last remaining data to be sent. Then, we unlink its |
| 4291 | * S structure from the interrupt chain if necessary, and we free |
| 4292 | * that IRQ if nothing is left in the chain. |
| 4293 | * ------------------------------------------------------------ |
| 4294 | */ |
| 4295 | static void |
| 4296 | rs_close(struct tty_struct *tty, struct file * filp) |
| 4297 | { |
| 4298 | struct e100_serial * info = (struct e100_serial *)tty->driver_data; |
| 4299 | unsigned long flags; |
| 4300 | |
| 4301 | if (!info) |
| 4302 | return; |
| 4303 | |
| 4304 | /* interrupts are disabled for this entire function */ |
| 4305 | |
| 4306 | save_flags(flags); |
| 4307 | cli(); |
| 4308 | |
| 4309 | if (tty_hung_up_p(filp)) { |
| 4310 | restore_flags(flags); |
| 4311 | return; |
| 4312 | } |
| 4313 | |
| 4314 | #ifdef SERIAL_DEBUG_OPEN |
| 4315 | printk("[%d] rs_close ttyS%d, count = %d\n", current->pid, |
| 4316 | info->line, info->count); |
| 4317 | #endif |
| 4318 | if ((tty->count == 1) && (info->count != 1)) { |
| 4319 | /* |
| 4320 | * Uh, oh. tty->count is 1, which means that the tty |
| 4321 | * structure will be freed. Info->count should always |
| 4322 | * be one in these conditions. If it's greater than |
| 4323 | * one, we've got real problems, since it means the |
| 4324 | * serial port won't be shutdown. |
| 4325 | */ |
| 4326 | printk(KERN_CRIT |
| 4327 | "rs_close: bad serial port count; tty->count is 1, " |
| 4328 | "info->count is %d\n", info->count); |
| 4329 | info->count = 1; |
| 4330 | } |
| 4331 | if (--info->count < 0) { |
| 4332 | printk(KERN_CRIT "rs_close: bad serial port count for ttyS%d: %d\n", |
| 4333 | info->line, info->count); |
| 4334 | info->count = 0; |
| 4335 | } |
| 4336 | if (info->count) { |
| 4337 | restore_flags(flags); |
| 4338 | return; |
| 4339 | } |
| 4340 | info->flags |= ASYNC_CLOSING; |
| 4341 | /* |
| 4342 | * Save the termios structure, since this port may have |
| 4343 | * separate termios for callout and dialin. |
| 4344 | */ |
| 4345 | if (info->flags & ASYNC_NORMAL_ACTIVE) |
| 4346 | info->normal_termios = *tty->termios; |
| 4347 | /* |
| 4348 | * Now we wait for the transmit buffer to clear; and we notify |
| 4349 | * the line discipline to only process XON/XOFF characters. |
| 4350 | */ |
| 4351 | tty->closing = 1; |
| 4352 | if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE) |
| 4353 | tty_wait_until_sent(tty, info->closing_wait); |
| 4354 | /* |
| 4355 | * At this point we stop accepting input. To do this, we |
| 4356 | * disable the serial receiver and the DMA receive interrupt. |
| 4357 | */ |
| 4358 | #ifdef SERIAL_HANDLE_EARLY_ERRORS |
| 4359 | e100_disable_serial_data_irq(info); |
| 4360 | #endif |
| 4361 | |
| 4362 | #ifndef CONFIG_SVINTO_SIM |
| 4363 | e100_disable_rx(info); |
| 4364 | e100_disable_rx_irq(info); |
| 4365 | |
| 4366 | if (info->flags & ASYNC_INITIALIZED) { |
| 4367 | /* |
| 4368 | * Before we drop DTR, make sure the UART transmitter |
| 4369 | * has completely drained; this is especially |
| 4370 | * important as we have a transmit FIFO! |
| 4371 | */ |
| 4372 | rs_wait_until_sent(tty, HZ); |
| 4373 | } |
| 4374 | #endif |
| 4375 | |
| 4376 | shutdown(info); |
| 4377 | if (tty->driver->flush_buffer) |
| 4378 | tty->driver->flush_buffer(tty); |
| 4379 | if (tty->ldisc.flush_buffer) |
| 4380 | tty->ldisc.flush_buffer(tty); |
| 4381 | tty->closing = 0; |
| 4382 | info->event = 0; |
| 4383 | info->tty = 0; |
| 4384 | if (info->blocked_open) { |
Nishanth Aravamudan | 3c76bc5 | 2005-11-07 01:01:21 -0800 | [diff] [blame] | 4385 | if (info->close_delay) |
| 4386 | schedule_timeout_interruptible(info->close_delay); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4387 | wake_up_interruptible(&info->open_wait); |
| 4388 | } |
| 4389 | info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING); |
| 4390 | wake_up_interruptible(&info->close_wait); |
| 4391 | restore_flags(flags); |
| 4392 | |
| 4393 | /* port closed */ |
| 4394 | |
| 4395 | #if defined(CONFIG_ETRAX_RS485) |
| 4396 | if (info->rs485.enabled) { |
| 4397 | info->rs485.enabled = 0; |
| 4398 | #if defined(CONFIG_ETRAX_RS485_ON_PA) |
| 4399 | *R_PORT_PA_DATA = port_pa_data_shadow &= ~(1 << rs485_pa_bit); |
| 4400 | #endif |
| 4401 | #if defined(CONFIG_ETRAX_RS485_ON_PORT_G) |
| 4402 | REG_SHADOW_SET(R_PORT_G_DATA, port_g_data_shadow, |
| 4403 | rs485_port_g_bit, 0); |
| 4404 | #endif |
| 4405 | #if defined(CONFIG_ETRAX_RS485_LTC1387) |
| 4406 | REG_SHADOW_SET(R_PORT_G_DATA, port_g_data_shadow, |
| 4407 | CONFIG_ETRAX_RS485_LTC1387_DXEN_PORT_G_BIT, 0); |
| 4408 | REG_SHADOW_SET(R_PORT_G_DATA, port_g_data_shadow, |
| 4409 | CONFIG_ETRAX_RS485_LTC1387_RXEN_PORT_G_BIT, 0); |
| 4410 | #endif |
| 4411 | } |
| 4412 | #endif |
| 4413 | } |
| 4414 | |
| 4415 | /* |
| 4416 | * rs_wait_until_sent() --- wait until the transmitter is empty |
| 4417 | */ |
| 4418 | static void rs_wait_until_sent(struct tty_struct *tty, int timeout) |
| 4419 | { |
| 4420 | unsigned long orig_jiffies; |
| 4421 | struct e100_serial *info = (struct e100_serial *)tty->driver_data; |
| 4422 | unsigned long curr_time = jiffies; |
| 4423 | unsigned long curr_time_usec = GET_JIFFIES_USEC(); |
| 4424 | long elapsed_usec = |
| 4425 | (curr_time - info->last_tx_active) * (1000000/HZ) + |
| 4426 | curr_time_usec - info->last_tx_active_usec; |
| 4427 | |
| 4428 | /* |
| 4429 | * Check R_DMA_CHx_STATUS bit 0-6=number of available bytes in FIFO |
| 4430 | * R_DMA_CHx_HWSW bit 31-16=nbr of bytes left in DMA buffer (0=64k) |
| 4431 | */ |
| 4432 | orig_jiffies = jiffies; |
| 4433 | while (info->xmit.head != info->xmit.tail || /* More in send queue */ |
| 4434 | (*info->ostatusadr & 0x007f) || /* more in FIFO */ |
| 4435 | (elapsed_usec < 2*info->char_time_usec)) { |
Nishanth Aravamudan | 3c76bc5 | 2005-11-07 01:01:21 -0800 | [diff] [blame] | 4436 | schedule_timeout_interruptible(1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4437 | if (signal_pending(current)) |
| 4438 | break; |
| 4439 | if (timeout && time_after(jiffies, orig_jiffies + timeout)) |
| 4440 | break; |
| 4441 | curr_time = jiffies; |
| 4442 | curr_time_usec = GET_JIFFIES_USEC(); |
| 4443 | elapsed_usec = |
| 4444 | (curr_time - info->last_tx_active) * (1000000/HZ) + |
| 4445 | curr_time_usec - info->last_tx_active_usec; |
| 4446 | } |
| 4447 | set_current_state(TASK_RUNNING); |
| 4448 | } |
| 4449 | |
| 4450 | /* |
| 4451 | * rs_hangup() --- called by tty_hangup() when a hangup is signaled. |
| 4452 | */ |
| 4453 | void |
| 4454 | rs_hangup(struct tty_struct *tty) |
| 4455 | { |
| 4456 | struct e100_serial * info = (struct e100_serial *)tty->driver_data; |
| 4457 | |
| 4458 | rs_flush_buffer(tty); |
| 4459 | shutdown(info); |
| 4460 | info->event = 0; |
| 4461 | info->count = 0; |
| 4462 | info->flags &= ~ASYNC_NORMAL_ACTIVE; |
| 4463 | info->tty = 0; |
| 4464 | wake_up_interruptible(&info->open_wait); |
| 4465 | } |
| 4466 | |
| 4467 | /* |
| 4468 | * ------------------------------------------------------------ |
| 4469 | * rs_open() and friends |
| 4470 | * ------------------------------------------------------------ |
| 4471 | */ |
| 4472 | static int |
| 4473 | block_til_ready(struct tty_struct *tty, struct file * filp, |
| 4474 | struct e100_serial *info) |
| 4475 | { |
| 4476 | DECLARE_WAITQUEUE(wait, current); |
| 4477 | unsigned long flags; |
| 4478 | int retval; |
| 4479 | int do_clocal = 0, extra_count = 0; |
| 4480 | |
| 4481 | /* |
| 4482 | * If the device is in the middle of being closed, then block |
| 4483 | * until it's done, and then try again. |
| 4484 | */ |
| 4485 | if (tty_hung_up_p(filp) || |
| 4486 | (info->flags & ASYNC_CLOSING)) { |
| 4487 | if (info->flags & ASYNC_CLOSING) |
| 4488 | interruptible_sleep_on(&info->close_wait); |
| 4489 | #ifdef SERIAL_DO_RESTART |
| 4490 | if (info->flags & ASYNC_HUP_NOTIFY) |
| 4491 | return -EAGAIN; |
| 4492 | else |
| 4493 | return -ERESTARTSYS; |
| 4494 | #else |
| 4495 | return -EAGAIN; |
| 4496 | #endif |
| 4497 | } |
| 4498 | |
| 4499 | /* |
| 4500 | * If non-blocking mode is set, or the port is not enabled, |
| 4501 | * then make the check up front and then exit. |
| 4502 | */ |
| 4503 | if ((filp->f_flags & O_NONBLOCK) || |
| 4504 | (tty->flags & (1 << TTY_IO_ERROR))) { |
| 4505 | info->flags |= ASYNC_NORMAL_ACTIVE; |
| 4506 | return 0; |
| 4507 | } |
| 4508 | |
| 4509 | if (tty->termios->c_cflag & CLOCAL) { |
| 4510 | do_clocal = 1; |
| 4511 | } |
| 4512 | |
| 4513 | /* |
| 4514 | * Block waiting for the carrier detect and the line to become |
| 4515 | * free (i.e., not in use by the callout). While we are in |
| 4516 | * this loop, info->count is dropped by one, so that |
| 4517 | * rs_close() knows when to free things. We restore it upon |
| 4518 | * exit, either normal or abnormal. |
| 4519 | */ |
| 4520 | retval = 0; |
| 4521 | add_wait_queue(&info->open_wait, &wait); |
| 4522 | #ifdef SERIAL_DEBUG_OPEN |
| 4523 | printk("block_til_ready before block: ttyS%d, count = %d\n", |
| 4524 | info->line, info->count); |
| 4525 | #endif |
| 4526 | save_flags(flags); |
| 4527 | cli(); |
| 4528 | if (!tty_hung_up_p(filp)) { |
| 4529 | extra_count++; |
| 4530 | info->count--; |
| 4531 | } |
| 4532 | restore_flags(flags); |
| 4533 | info->blocked_open++; |
| 4534 | while (1) { |
| 4535 | save_flags(flags); |
| 4536 | cli(); |
| 4537 | /* assert RTS and DTR */ |
| 4538 | e100_rts(info, 1); |
| 4539 | e100_dtr(info, 1); |
| 4540 | restore_flags(flags); |
| 4541 | set_current_state(TASK_INTERRUPTIBLE); |
| 4542 | if (tty_hung_up_p(filp) || |
| 4543 | !(info->flags & ASYNC_INITIALIZED)) { |
| 4544 | #ifdef SERIAL_DO_RESTART |
| 4545 | if (info->flags & ASYNC_HUP_NOTIFY) |
| 4546 | retval = -EAGAIN; |
| 4547 | else |
| 4548 | retval = -ERESTARTSYS; |
| 4549 | #else |
| 4550 | retval = -EAGAIN; |
| 4551 | #endif |
| 4552 | break; |
| 4553 | } |
| 4554 | if (!(info->flags & ASYNC_CLOSING) && do_clocal) |
| 4555 | /* && (do_clocal || DCD_IS_ASSERTED) */ |
| 4556 | break; |
| 4557 | if (signal_pending(current)) { |
| 4558 | retval = -ERESTARTSYS; |
| 4559 | break; |
| 4560 | } |
| 4561 | #ifdef SERIAL_DEBUG_OPEN |
| 4562 | printk("block_til_ready blocking: ttyS%d, count = %d\n", |
| 4563 | info->line, info->count); |
| 4564 | #endif |
| 4565 | schedule(); |
| 4566 | } |
| 4567 | set_current_state(TASK_RUNNING); |
| 4568 | remove_wait_queue(&info->open_wait, &wait); |
| 4569 | if (extra_count) |
| 4570 | info->count++; |
| 4571 | info->blocked_open--; |
| 4572 | #ifdef SERIAL_DEBUG_OPEN |
| 4573 | printk("block_til_ready after blocking: ttyS%d, count = %d\n", |
| 4574 | info->line, info->count); |
| 4575 | #endif |
| 4576 | if (retval) |
| 4577 | return retval; |
| 4578 | info->flags |= ASYNC_NORMAL_ACTIVE; |
| 4579 | return 0; |
| 4580 | } |
| 4581 | |
| 4582 | /* |
| 4583 | * This routine is called whenever a serial port is opened. |
| 4584 | * It performs the serial-specific initialization for the tty structure. |
| 4585 | */ |
| 4586 | static int |
| 4587 | rs_open(struct tty_struct *tty, struct file * filp) |
| 4588 | { |
| 4589 | struct e100_serial *info; |
| 4590 | int retval, line; |
| 4591 | unsigned long page; |
| 4592 | |
| 4593 | /* find which port we want to open */ |
| 4594 | |
| 4595 | line = tty->index; |
| 4596 | |
| 4597 | if (line < 0 || line >= NR_PORTS) |
| 4598 | return -ENODEV; |
| 4599 | |
| 4600 | /* find the corresponding e100_serial struct in the table */ |
| 4601 | info = rs_table + line; |
| 4602 | |
| 4603 | /* don't allow the opening of ports that are not enabled in the HW config */ |
| 4604 | if (!info->enabled) |
| 4605 | return -ENODEV; |
| 4606 | |
| 4607 | #ifdef SERIAL_DEBUG_OPEN |
| 4608 | printk("[%d] rs_open %s, count = %d\n", current->pid, tty->name, |
| 4609 | info->count); |
| 4610 | #endif |
| 4611 | |
| 4612 | info->count++; |
| 4613 | tty->driver_data = info; |
| 4614 | info->tty = tty; |
| 4615 | |
| 4616 | info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0; |
| 4617 | |
| 4618 | if (!tmp_buf) { |
| 4619 | page = get_zeroed_page(GFP_KERNEL); |
| 4620 | if (!page) { |
| 4621 | return -ENOMEM; |
| 4622 | } |
| 4623 | if (tmp_buf) |
| 4624 | free_page(page); |
| 4625 | else |
| 4626 | tmp_buf = (unsigned char *) page; |
| 4627 | } |
| 4628 | |
| 4629 | /* |
| 4630 | * If the port is in the middle of closing, bail out now |
| 4631 | */ |
| 4632 | if (tty_hung_up_p(filp) || |
| 4633 | (info->flags & ASYNC_CLOSING)) { |
| 4634 | if (info->flags & ASYNC_CLOSING) |
| 4635 | interruptible_sleep_on(&info->close_wait); |
| 4636 | #ifdef SERIAL_DO_RESTART |
| 4637 | return ((info->flags & ASYNC_HUP_NOTIFY) ? |
| 4638 | -EAGAIN : -ERESTARTSYS); |
| 4639 | #else |
| 4640 | return -EAGAIN; |
| 4641 | #endif |
| 4642 | } |
| 4643 | |
| 4644 | /* |
| 4645 | * Start up the serial port |
| 4646 | */ |
| 4647 | |
| 4648 | retval = startup(info); |
| 4649 | if (retval) |
| 4650 | return retval; |
| 4651 | |
| 4652 | retval = block_til_ready(tty, filp, info); |
| 4653 | if (retval) { |
| 4654 | #ifdef SERIAL_DEBUG_OPEN |
| 4655 | printk("rs_open returning after block_til_ready with %d\n", |
| 4656 | retval); |
| 4657 | #endif |
| 4658 | return retval; |
| 4659 | } |
| 4660 | |
| 4661 | if ((info->count == 1) && (info->flags & ASYNC_SPLIT_TERMIOS)) { |
| 4662 | *tty->termios = info->normal_termios; |
| 4663 | change_speed(info); |
| 4664 | } |
| 4665 | |
| 4666 | #ifdef SERIAL_DEBUG_OPEN |
| 4667 | printk("rs_open ttyS%d successful...\n", info->line); |
| 4668 | #endif |
| 4669 | DLOG_INT_TRIG( log_int_pos = 0); |
| 4670 | |
| 4671 | DFLIP( if (info->line == SERIAL_DEBUG_LINE) { |
| 4672 | info->icount.rx = 0; |
| 4673 | } ); |
| 4674 | |
| 4675 | return 0; |
| 4676 | } |
| 4677 | |
| 4678 | /* |
| 4679 | * /proc fs routines.... |
| 4680 | */ |
| 4681 | |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 4682 | static int line_info(char *buf, struct e100_serial *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4683 | { |
| 4684 | char stat_buf[30]; |
| 4685 | int ret; |
| 4686 | unsigned long tmp; |
| 4687 | |
| 4688 | ret = sprintf(buf, "%d: uart:E100 port:%lX irq:%d", |
| 4689 | info->line, (unsigned long)info->port, info->irq); |
| 4690 | |
| 4691 | if (!info->port || (info->type == PORT_UNKNOWN)) { |
| 4692 | ret += sprintf(buf+ret, "\n"); |
| 4693 | return ret; |
| 4694 | } |
| 4695 | |
| 4696 | stat_buf[0] = 0; |
| 4697 | stat_buf[1] = 0; |
| 4698 | if (!E100_RTS_GET(info)) |
| 4699 | strcat(stat_buf, "|RTS"); |
| 4700 | if (!E100_CTS_GET(info)) |
| 4701 | strcat(stat_buf, "|CTS"); |
| 4702 | if (!E100_DTR_GET(info)) |
| 4703 | strcat(stat_buf, "|DTR"); |
| 4704 | if (!E100_DSR_GET(info)) |
| 4705 | strcat(stat_buf, "|DSR"); |
| 4706 | if (!E100_CD_GET(info)) |
| 4707 | strcat(stat_buf, "|CD"); |
| 4708 | if (!E100_RI_GET(info)) |
| 4709 | strcat(stat_buf, "|RI"); |
| 4710 | |
| 4711 | ret += sprintf(buf+ret, " baud:%d", info->baud); |
| 4712 | |
| 4713 | ret += sprintf(buf+ret, " tx:%lu rx:%lu", |
| 4714 | (unsigned long)info->icount.tx, |
| 4715 | (unsigned long)info->icount.rx); |
| 4716 | tmp = CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); |
| 4717 | if (tmp) { |
| 4718 | ret += sprintf(buf+ret, " tx_pend:%lu/%lu", |
| 4719 | (unsigned long)tmp, |
| 4720 | (unsigned long)SERIAL_XMIT_SIZE); |
| 4721 | } |
| 4722 | |
| 4723 | ret += sprintf(buf+ret, " rx_pend:%lu/%lu", |
| 4724 | (unsigned long)info->recv_cnt, |
| 4725 | (unsigned long)info->max_recv_cnt); |
| 4726 | |
| 4727 | #if 1 |
| 4728 | if (info->tty) { |
| 4729 | |
| 4730 | if (info->tty->stopped) |
| 4731 | ret += sprintf(buf+ret, " stopped:%i", |
| 4732 | (int)info->tty->stopped); |
| 4733 | if (info->tty->hw_stopped) |
| 4734 | ret += sprintf(buf+ret, " hw_stopped:%i", |
| 4735 | (int)info->tty->hw_stopped); |
| 4736 | } |
| 4737 | |
| 4738 | { |
| 4739 | unsigned char rstat = info->port[REG_STATUS]; |
| 4740 | if (rstat & IO_MASK(R_SERIAL0_STATUS, xoff_detect) ) |
| 4741 | ret += sprintf(buf+ret, " xoff_detect:1"); |
| 4742 | } |
| 4743 | |
| 4744 | #endif |
| 4745 | |
| 4746 | |
| 4747 | |
| 4748 | |
| 4749 | if (info->icount.frame) |
| 4750 | ret += sprintf(buf+ret, " fe:%lu", |
| 4751 | (unsigned long)info->icount.frame); |
| 4752 | |
| 4753 | if (info->icount.parity) |
| 4754 | ret += sprintf(buf+ret, " pe:%lu", |
| 4755 | (unsigned long)info->icount.parity); |
| 4756 | |
| 4757 | if (info->icount.brk) |
| 4758 | ret += sprintf(buf+ret, " brk:%lu", |
| 4759 | (unsigned long)info->icount.brk); |
| 4760 | |
| 4761 | if (info->icount.overrun) |
| 4762 | ret += sprintf(buf+ret, " oe:%lu", |
| 4763 | (unsigned long)info->icount.overrun); |
| 4764 | |
| 4765 | /* |
| 4766 | * Last thing is the RS-232 status lines |
| 4767 | */ |
| 4768 | ret += sprintf(buf+ret, " %s\n", stat_buf+1); |
| 4769 | return ret; |
| 4770 | } |
| 4771 | |
| 4772 | int rs_read_proc(char *page, char **start, off_t off, int count, |
| 4773 | int *eof, void *data) |
| 4774 | { |
| 4775 | int i, len = 0, l; |
| 4776 | off_t begin = 0; |
| 4777 | |
| 4778 | len += sprintf(page, "serinfo:1.0 driver:%s\n", |
| 4779 | serial_version); |
| 4780 | for (i = 0; i < NR_PORTS && len < 4000; i++) { |
| 4781 | if (!rs_table[i].enabled) |
| 4782 | continue; |
| 4783 | l = line_info(page + len, &rs_table[i]); |
| 4784 | len += l; |
| 4785 | if (len+begin > off+count) |
| 4786 | goto done; |
| 4787 | if (len+begin < off) { |
| 4788 | begin += len; |
| 4789 | len = 0; |
| 4790 | } |
| 4791 | } |
| 4792 | #ifdef DEBUG_LOG_INCLUDED |
| 4793 | for (i = 0; i < debug_log_pos; i++) { |
| 4794 | len += sprintf(page + len, "%-4i %lu.%lu ", i, debug_log[i].time, timer_data_to_ns(debug_log[i].timer_data)); |
| 4795 | len += sprintf(page + len, debug_log[i].string, debug_log[i].value); |
| 4796 | if (len+begin > off+count) |
| 4797 | goto done; |
| 4798 | if (len+begin < off) { |
| 4799 | begin += len; |
| 4800 | len = 0; |
| 4801 | } |
| 4802 | } |
| 4803 | len += sprintf(page + len, "debug_log %i/%i %li bytes\n", |
| 4804 | i, DEBUG_LOG_SIZE, begin+len); |
| 4805 | debug_log_pos = 0; |
| 4806 | #endif |
| 4807 | |
| 4808 | *eof = 1; |
| 4809 | done: |
| 4810 | if (off >= len+begin) |
| 4811 | return 0; |
| 4812 | *start = page + (off-begin); |
| 4813 | return ((count < begin+len-off) ? count : begin+len-off); |
| 4814 | } |
| 4815 | |
| 4816 | /* Finally, routines used to initialize the serial driver. */ |
| 4817 | |
| 4818 | static void |
| 4819 | show_serial_version(void) |
| 4820 | { |
| 4821 | printk(KERN_INFO |
| 4822 | "ETRAX 100LX serial-driver %s, (c) 2000-2004 Axis Communications AB\r\n", |
| 4823 | &serial_version[11]); /* "$Revision: x.yy" */ |
| 4824 | } |
| 4825 | |
| 4826 | /* rs_init inits the driver at boot (using the module_init chain) */ |
| 4827 | |
Jeff Dike | b68e31d | 2006-10-02 02:17:18 -0700 | [diff] [blame^] | 4828 | static const struct tty_operations rs_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4829 | .open = rs_open, |
| 4830 | .close = rs_close, |
| 4831 | .write = rs_write, |
| 4832 | .flush_chars = rs_flush_chars, |
| 4833 | .write_room = rs_write_room, |
| 4834 | .chars_in_buffer = rs_chars_in_buffer, |
| 4835 | .flush_buffer = rs_flush_buffer, |
| 4836 | .ioctl = rs_ioctl, |
| 4837 | .throttle = rs_throttle, |
| 4838 | .unthrottle = rs_unthrottle, |
| 4839 | .set_termios = rs_set_termios, |
| 4840 | .stop = rs_stop, |
| 4841 | .start = rs_start, |
| 4842 | .hangup = rs_hangup, |
| 4843 | .break_ctl = rs_break, |
| 4844 | .send_xchar = rs_send_xchar, |
| 4845 | .wait_until_sent = rs_wait_until_sent, |
| 4846 | .read_proc = rs_read_proc, |
| 4847 | }; |
| 4848 | |
| 4849 | static int __init |
| 4850 | rs_init(void) |
| 4851 | { |
| 4852 | int i; |
| 4853 | struct e100_serial *info; |
| 4854 | struct tty_driver *driver = alloc_tty_driver(NR_PORTS); |
| 4855 | |
| 4856 | if (!driver) |
| 4857 | return -ENOMEM; |
| 4858 | |
| 4859 | show_serial_version(); |
| 4860 | |
| 4861 | /* Setup the timed flush handler system */ |
| 4862 | |
| 4863 | #if !defined(CONFIG_ETRAX_SERIAL_FAST_TIMER) |
| 4864 | init_timer(&flush_timer); |
| 4865 | flush_timer.function = timed_flush_handler; |
| 4866 | mod_timer(&flush_timer, jiffies + CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS); |
| 4867 | #endif |
| 4868 | |
| 4869 | /* Initialize the tty_driver structure */ |
| 4870 | |
| 4871 | driver->driver_name = "serial"; |
| 4872 | driver->name = "ttyS"; |
| 4873 | driver->major = TTY_MAJOR; |
| 4874 | driver->minor_start = 64; |
| 4875 | driver->type = TTY_DRIVER_TYPE_SERIAL; |
| 4876 | driver->subtype = SERIAL_TYPE_NORMAL; |
| 4877 | driver->init_termios = tty_std_termios; |
| 4878 | driver->init_termios.c_cflag = |
| 4879 | B115200 | CS8 | CREAD | HUPCL | CLOCAL; /* is normally B9600 default... */ |
Greg Kroah-Hartman | 331b831 | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 4880 | driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4881 | driver->termios = serial_termios; |
| 4882 | driver->termios_locked = serial_termios_locked; |
| 4883 | |
| 4884 | tty_set_operations(driver, &rs_ops); |
| 4885 | serial_driver = driver; |
| 4886 | if (tty_register_driver(driver)) |
| 4887 | panic("Couldn't register serial driver\n"); |
| 4888 | /* do some initializing for the separate ports */ |
| 4889 | |
| 4890 | for (i = 0, info = rs_table; i < NR_PORTS; i++,info++) { |
| 4891 | info->uses_dma_in = 0; |
| 4892 | info->uses_dma_out = 0; |
| 4893 | info->line = i; |
| 4894 | info->tty = 0; |
| 4895 | info->type = PORT_ETRAX; |
| 4896 | info->tr_running = 0; |
| 4897 | info->forced_eop = 0; |
| 4898 | info->baud_base = DEF_BAUD_BASE; |
| 4899 | info->custom_divisor = 0; |
| 4900 | info->flags = 0; |
| 4901 | info->close_delay = 5*HZ/10; |
| 4902 | info->closing_wait = 30*HZ; |
| 4903 | info->x_char = 0; |
| 4904 | info->event = 0; |
| 4905 | info->count = 0; |
| 4906 | info->blocked_open = 0; |
| 4907 | info->normal_termios = driver->init_termios; |
| 4908 | init_waitqueue_head(&info->open_wait); |
| 4909 | init_waitqueue_head(&info->close_wait); |
| 4910 | info->xmit.buf = NULL; |
| 4911 | info->xmit.tail = info->xmit.head = 0; |
| 4912 | info->first_recv_buffer = info->last_recv_buffer = NULL; |
| 4913 | info->recv_cnt = info->max_recv_cnt = 0; |
| 4914 | info->last_tx_active_usec = 0; |
| 4915 | info->last_tx_active = 0; |
| 4916 | |
| 4917 | #if defined(CONFIG_ETRAX_RS485) |
| 4918 | /* Set sane defaults */ |
| 4919 | info->rs485.rts_on_send = 0; |
| 4920 | info->rs485.rts_after_sent = 1; |
| 4921 | info->rs485.delay_rts_before_send = 0; |
| 4922 | info->rs485.enabled = 0; |
| 4923 | #endif |
| 4924 | INIT_WORK(&info->work, do_softint, info); |
| 4925 | |
| 4926 | if (info->enabled) { |
| 4927 | printk(KERN_INFO "%s%d at 0x%x is a builtin UART with DMA\n", |
| 4928 | serial_driver->name, info->line, (unsigned int)info->port); |
| 4929 | } |
| 4930 | } |
| 4931 | #ifdef CONFIG_ETRAX_FAST_TIMER |
| 4932 | #ifdef CONFIG_ETRAX_SERIAL_FAST_TIMER |
| 4933 | memset(fast_timers, 0, sizeof(fast_timers)); |
| 4934 | #endif |
| 4935 | #ifdef CONFIG_ETRAX_RS485 |
| 4936 | memset(fast_timers_rs485, 0, sizeof(fast_timers_rs485)); |
| 4937 | #endif |
| 4938 | fast_timer_init(); |
| 4939 | #endif |
| 4940 | |
| 4941 | #ifndef CONFIG_SVINTO_SIM |
| 4942 | /* Not needed in simulator. May only complicate stuff. */ |
| 4943 | /* hook the irq's for DMA channel 6 and 7, serial output and input, and some more... */ |
| 4944 | |
Thomas Gleixner | 40663cc | 2006-07-01 19:29:43 -0700 | [diff] [blame] | 4945 | if (request_irq(SERIAL_IRQ_NBR, ser_interrupt, IRQF_SHARED | IRQF_DISABLED, "serial ", NULL)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4946 | panic("irq8"); |
| 4947 | |
| 4948 | #ifdef CONFIG_ETRAX_SERIAL_PORT0 |
| 4949 | #ifdef CONFIG_ETRAX_SERIAL_PORT0_DMA6_OUT |
Thomas Gleixner | 40663cc | 2006-07-01 19:29:43 -0700 | [diff] [blame] | 4950 | if (request_irq(SER0_DMA_TX_IRQ_NBR, tr_interrupt, IRQF_DISABLED, "serial 0 dma tr", NULL)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4951 | panic("irq22"); |
| 4952 | #endif |
| 4953 | #ifdef CONFIG_ETRAX_SERIAL_PORT0_DMA7_IN |
Thomas Gleixner | 40663cc | 2006-07-01 19:29:43 -0700 | [diff] [blame] | 4954 | if (request_irq(SER0_DMA_RX_IRQ_NBR, rec_interrupt, IRQF_DISABLED, "serial 0 dma rec", NULL)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4955 | panic("irq23"); |
| 4956 | #endif |
| 4957 | #endif |
| 4958 | |
| 4959 | #ifdef CONFIG_ETRAX_SERIAL_PORT1 |
| 4960 | #ifdef CONFIG_ETRAX_SERIAL_PORT1_DMA8_OUT |
Thomas Gleixner | 40663cc | 2006-07-01 19:29:43 -0700 | [diff] [blame] | 4961 | if (request_irq(SER1_DMA_TX_IRQ_NBR, tr_interrupt, IRQF_DISABLED, "serial 1 dma tr", NULL)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4962 | panic("irq24"); |
| 4963 | #endif |
| 4964 | #ifdef CONFIG_ETRAX_SERIAL_PORT1_DMA9_IN |
Thomas Gleixner | 40663cc | 2006-07-01 19:29:43 -0700 | [diff] [blame] | 4965 | if (request_irq(SER1_DMA_RX_IRQ_NBR, rec_interrupt, IRQF_DISABLED, "serial 1 dma rec", NULL)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4966 | panic("irq25"); |
| 4967 | #endif |
| 4968 | #endif |
| 4969 | #ifdef CONFIG_ETRAX_SERIAL_PORT2 |
| 4970 | /* DMA Shared with par0 (and SCSI0 and ATA) */ |
| 4971 | #ifdef CONFIG_ETRAX_SERIAL_PORT2_DMA2_OUT |
Thomas Gleixner | 40663cc | 2006-07-01 19:29:43 -0700 | [diff] [blame] | 4972 | if (request_irq(SER2_DMA_TX_IRQ_NBR, tr_interrupt, IRQF_SHARED | IRQF_DISABLED, "serial 2 dma tr", NULL)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4973 | panic("irq18"); |
| 4974 | #endif |
| 4975 | #ifdef CONFIG_ETRAX_SERIAL_PORT2_DMA3_IN |
Thomas Gleixner | 40663cc | 2006-07-01 19:29:43 -0700 | [diff] [blame] | 4976 | if (request_irq(SER2_DMA_RX_IRQ_NBR, rec_interrupt, IRQF_SHARED | IRQF_DISABLED, "serial 2 dma rec", NULL)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4977 | panic("irq19"); |
| 4978 | #endif |
| 4979 | #endif |
| 4980 | #ifdef CONFIG_ETRAX_SERIAL_PORT3 |
| 4981 | /* DMA Shared with par1 (and SCSI1 and Extern DMA 0) */ |
| 4982 | #ifdef CONFIG_ETRAX_SERIAL_PORT3_DMA4_OUT |
Thomas Gleixner | 40663cc | 2006-07-01 19:29:43 -0700 | [diff] [blame] | 4983 | if (request_irq(SER3_DMA_TX_IRQ_NBR, tr_interrupt, IRQF_SHARED | IRQF_DISABLED, "serial 3 dma tr", NULL)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4984 | panic("irq20"); |
| 4985 | #endif |
| 4986 | #ifdef CONFIG_ETRAX_SERIAL_PORT3_DMA5_IN |
Thomas Gleixner | 40663cc | 2006-07-01 19:29:43 -0700 | [diff] [blame] | 4987 | if (request_irq(SER3_DMA_RX_IRQ_NBR, rec_interrupt, IRQF_SHARED | IRQF_DISABLED, "serial 3 dma rec", NULL)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4988 | panic("irq21"); |
| 4989 | #endif |
| 4990 | #endif |
| 4991 | |
| 4992 | #ifdef CONFIG_ETRAX_SERIAL_FLUSH_DMA_FAST |
Thomas Gleixner | 40663cc | 2006-07-01 19:29:43 -0700 | [diff] [blame] | 4993 | if (request_irq(TIMER1_IRQ_NBR, timeout_interrupt, IRQF_SHARED | IRQF_DISABLED, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4994 | "fast serial dma timeout", NULL)) { |
| 4995 | printk(KERN_CRIT "err: timer1 irq\n"); |
| 4996 | } |
| 4997 | #endif |
| 4998 | #endif /* CONFIG_SVINTO_SIM */ |
| 4999 | debug_write_function = rs_debug_write_function; |
| 5000 | return 0; |
| 5001 | } |
| 5002 | |
| 5003 | /* this makes sure that rs_init is called during kernel boot */ |
| 5004 | |
| 5005 | module_init(rs_init); |