Greg Kroah-Hartman | e3b3d0f | 2017-11-06 18:11:51 +0100 | [diff] [blame^] | 1 | // SPDX-License-Identifier: GPL-2.0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * Serial driver for the amiga builtin port. |
| 4 | * |
| 5 | * This code was created by taking serial.c version 4.30 from kernel |
| 6 | * release 2.3.22, replacing all hardware related stuff with the |
| 7 | * corresponding amiga hardware actions, and removing all irrelevant |
| 8 | * code. As a consequence, it uses many of the constants and names |
| 9 | * associated with the registers and bits of 16550 compatible UARTS - |
| 10 | * but only to keep track of status, etc in the state variables. It |
| 11 | * was done this was to make it easier to keep the code in line with |
| 12 | * (non hardware specific) changes to serial.c. |
| 13 | * |
| 14 | * The port is registered with the tty driver as minor device 64, and |
| 15 | * therefore other ports should should only use 65 upwards. |
| 16 | * |
| 17 | * Richard Lucock 28/12/99 |
| 18 | * |
| 19 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 20 | * Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, |
| 21 | * 1998, 1999 Theodore Ts'o |
| 22 | * |
| 23 | */ |
| 24 | |
| 25 | /* |
| 26 | * Serial driver configuration section. Here are the various options: |
| 27 | * |
| 28 | * SERIAL_PARANOIA_CHECK |
| 29 | * Check the magic number for the async_structure where |
| 30 | * ever possible. |
| 31 | */ |
| 32 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | #include <linux/delay.h> |
| 34 | |
| 35 | #undef SERIAL_PARANOIA_CHECK |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | |
| 37 | /* Set of debugging defines */ |
| 38 | |
| 39 | #undef SERIAL_DEBUG_INTR |
| 40 | #undef SERIAL_DEBUG_OPEN |
| 41 | #undef SERIAL_DEBUG_FLOW |
| 42 | #undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT |
| 43 | |
| 44 | /* Sanity checks */ |
| 45 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | #if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT) |
| 47 | #define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \ |
Jiri Slaby | 01bd730 | 2012-03-05 14:52:27 +0100 | [diff] [blame] | 48 | tty->name, (info->tport.flags), serial_driver->refcount,info->count,tty->count,s) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | #else |
| 50 | #define DBG_CNT(s) |
| 51 | #endif |
| 52 | |
| 53 | /* |
| 54 | * End of serial driver configuration section. |
| 55 | */ |
| 56 | |
| 57 | #include <linux/module.h> |
| 58 | |
| 59 | #include <linux/types.h> |
| 60 | #include <linux/serial.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | #include <linux/serial_reg.h> |
| 62 | static char *serial_version = "4.30"; |
| 63 | |
| 64 | #include <linux/errno.h> |
| 65 | #include <linux/signal.h> |
| 66 | #include <linux/sched.h> |
| 67 | #include <linux/kernel.h> |
| 68 | #include <linux/timer.h> |
| 69 | #include <linux/interrupt.h> |
| 70 | #include <linux/tty.h> |
| 71 | #include <linux/tty_flip.h> |
Jiri Slaby | 6fe18d2 | 2012-03-05 14:52:45 +0100 | [diff] [blame] | 72 | #include <linux/circ_buf.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | #include <linux/console.h> |
| 74 | #include <linux/major.h> |
| 75 | #include <linux/string.h> |
| 76 | #include <linux/fcntl.h> |
| 77 | #include <linux/ptrace.h> |
| 78 | #include <linux/ioport.h> |
| 79 | #include <linux/mm.h> |
Alexey Dobriyan | d594027 | 2009-03-31 15:19:23 -0700 | [diff] [blame] | 80 | #include <linux/seq_file.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | #include <linux/slab.h> |
| 82 | #include <linux/init.h> |
| 83 | #include <linux/bitops.h> |
Geert Uytterhoeven | 826e8c8 | 2009-04-05 13:12:30 +0200 | [diff] [blame] | 84 | #include <linux/platform_device.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | |
| 86 | #include <asm/setup.h> |
| 87 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | |
| 89 | #include <asm/irq.h> |
| 90 | |
| 91 | #include <asm/amigahw.h> |
| 92 | #include <asm/amigaints.h> |
| 93 | |
Jiri Slaby | 6fe18d2 | 2012-03-05 14:52:45 +0100 | [diff] [blame] | 94 | struct serial_state { |
| 95 | struct tty_port tport; |
| 96 | struct circ_buf xmit; |
| 97 | struct async_icount icount; |
| 98 | |
| 99 | unsigned long port; |
| 100 | int baud_base; |
| 101 | int xmit_fifo_size; |
| 102 | int custom_divisor; |
| 103 | int read_status_mask; |
| 104 | int ignore_status_mask; |
| 105 | int timeout; |
| 106 | int quot; |
| 107 | int IER; /* Interrupt Enable Register */ |
| 108 | int MCR; /* Modem control register */ |
| 109 | int x_char; /* xon/xoff character */ |
| 110 | }; |
| 111 | |
Al Viro | b4290a2 | 2006-01-12 01:06:12 -0800 | [diff] [blame] | 112 | #define custom amiga_custom |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | static char *serial_name = "Amiga-builtin serial driver"; |
| 114 | |
| 115 | static struct tty_driver *serial_driver; |
| 116 | |
| 117 | /* number of characters left in xmit buffer before we ask for more */ |
| 118 | #define WAKEUP_CHARS 256 |
| 119 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | static unsigned char current_ctl_bits; |
| 121 | |
Jiri Slaby | 588993d | 2012-03-05 14:52:22 +0100 | [diff] [blame] | 122 | static void change_speed(struct tty_struct *tty, struct serial_state *info, |
| 123 | struct ktermios *old); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | static void rs_wait_until_sent(struct tty_struct *tty, int timeout); |
| 125 | |
| 126 | |
| 127 | static struct serial_state rs_table[1]; |
| 128 | |
Tobias Klauser | fe97107 | 2006-01-09 20:54:02 -0800 | [diff] [blame] | 129 | #define NR_PORTS ARRAY_SIZE(rs_table) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | |
Linus Torvalds | 7c0f6ba | 2016-12-24 11:46:01 -0800 | [diff] [blame] | 131 | #include <linux/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | |
| 133 | #define serial_isroot() (capable(CAP_SYS_ADMIN)) |
| 134 | |
| 135 | |
Jiri Slaby | 916b765 | 2012-03-05 14:52:20 +0100 | [diff] [blame] | 136 | static inline int serial_paranoia_check(struct serial_state *info, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | char *name, const char *routine) |
| 138 | { |
| 139 | #ifdef SERIAL_PARANOIA_CHECK |
| 140 | static const char *badmagic = |
| 141 | "Warning: bad magic number for serial struct (%s) in %s\n"; |
| 142 | static const char *badinfo = |
| 143 | "Warning: null async_struct for (%s) in %s\n"; |
| 144 | |
| 145 | if (!info) { |
| 146 | printk(badinfo, name, routine); |
| 147 | return 1; |
| 148 | } |
| 149 | if (info->magic != SERIAL_MAGIC) { |
| 150 | printk(badmagic, name, routine); |
| 151 | return 1; |
| 152 | } |
| 153 | #endif |
| 154 | return 0; |
| 155 | } |
| 156 | |
| 157 | /* some serial hardware definitions */ |
| 158 | #define SDR_OVRUN (1<<15) |
| 159 | #define SDR_RBF (1<<14) |
| 160 | #define SDR_TBE (1<<13) |
| 161 | #define SDR_TSRE (1<<12) |
| 162 | |
| 163 | #define SERPER_PARENB (1<<15) |
| 164 | |
| 165 | #define AC_SETCLR (1<<15) |
| 166 | #define AC_UARTBRK (1<<11) |
| 167 | |
| 168 | #define SER_DTR (1<<7) |
| 169 | #define SER_RTS (1<<6) |
| 170 | #define SER_DCD (1<<5) |
| 171 | #define SER_CTS (1<<4) |
| 172 | #define SER_DSR (1<<3) |
| 173 | |
| 174 | static __inline__ void rtsdtr_ctrl(int bits) |
| 175 | { |
| 176 | ciab.pra = ((bits & (SER_RTS | SER_DTR)) ^ (SER_RTS | SER_DTR)) | (ciab.pra & ~(SER_RTS | SER_DTR)); |
| 177 | } |
| 178 | |
| 179 | /* |
| 180 | * ------------------------------------------------------------ |
| 181 | * rs_stop() and rs_start() |
| 182 | * |
| 183 | * This routines are called before setting or resetting tty->stopped. |
| 184 | * They enable or disable transmitter interrupts, as necessary. |
| 185 | * ------------------------------------------------------------ |
| 186 | */ |
| 187 | static void rs_stop(struct tty_struct *tty) |
| 188 | { |
Jiri Slaby | 916b765 | 2012-03-05 14:52:20 +0100 | [diff] [blame] | 189 | struct serial_state *info = tty->driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | unsigned long flags; |
| 191 | |
| 192 | if (serial_paranoia_check(info, tty->name, "rs_stop")) |
| 193 | return; |
| 194 | |
| 195 | local_irq_save(flags); |
| 196 | if (info->IER & UART_IER_THRI) { |
| 197 | info->IER &= ~UART_IER_THRI; |
| 198 | /* disable Tx interrupt and remove any pending interrupts */ |
| 199 | custom.intena = IF_TBE; |
| 200 | mb(); |
| 201 | custom.intreq = IF_TBE; |
| 202 | mb(); |
| 203 | } |
| 204 | local_irq_restore(flags); |
| 205 | } |
| 206 | |
| 207 | static void rs_start(struct tty_struct *tty) |
| 208 | { |
Jiri Slaby | 916b765 | 2012-03-05 14:52:20 +0100 | [diff] [blame] | 209 | struct serial_state *info = tty->driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | unsigned long flags; |
| 211 | |
| 212 | if (serial_paranoia_check(info, tty->name, "rs_start")) |
| 213 | return; |
| 214 | |
| 215 | local_irq_save(flags); |
| 216 | if (info->xmit.head != info->xmit.tail |
| 217 | && info->xmit.buf |
| 218 | && !(info->IER & UART_IER_THRI)) { |
| 219 | info->IER |= UART_IER_THRI; |
| 220 | custom.intena = IF_SETCLR | IF_TBE; |
| 221 | mb(); |
| 222 | /* set a pending Tx Interrupt, transmitter should restart now */ |
| 223 | custom.intreq = IF_SETCLR | IF_TBE; |
| 224 | mb(); |
| 225 | } |
| 226 | local_irq_restore(flags); |
| 227 | } |
| 228 | |
| 229 | /* |
| 230 | * ---------------------------------------------------------------------- |
| 231 | * |
| 232 | * Here starts the interrupt handling routines. All of the following |
| 233 | * subroutines are declared as inline and are folded into |
| 234 | * rs_interrupt(). They were separated out for readability's sake. |
| 235 | * |
| 236 | * Note: rs_interrupt() is a "fast" interrupt, which means that it |
| 237 | * runs with interrupts turned off. People who may want to modify |
| 238 | * rs_interrupt() should try to keep the interrupt handler as fast as |
| 239 | * possible. After you are done making modifications, it is not a bad |
| 240 | * idea to do: |
| 241 | * |
| 242 | * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c |
| 243 | * |
| 244 | * and look at the resulting assemble code in serial.s. |
| 245 | * |
| 246 | * - Ted Ts'o (tytso@mit.edu), 7-Mar-93 |
| 247 | * ----------------------------------------------------------------------- |
| 248 | */ |
| 249 | |
Jiri Slaby | 916b765 | 2012-03-05 14:52:20 +0100 | [diff] [blame] | 250 | static void receive_chars(struct serial_state *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | { |
| 252 | int status; |
| 253 | int serdatr; |
Alan Cox | 33f0f88 | 2006-01-09 20:54:13 -0800 | [diff] [blame] | 254 | unsigned char ch, flag; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | struct async_icount *icount; |
Alan Cox | 33f0f88 | 2006-01-09 20:54:13 -0800 | [diff] [blame] | 256 | int oe = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | |
Jiri Slaby | 916b765 | 2012-03-05 14:52:20 +0100 | [diff] [blame] | 258 | icount = &info->icount; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | |
| 260 | status = UART_LSR_DR; /* We obviously have a character! */ |
| 261 | serdatr = custom.serdatr; |
| 262 | mb(); |
| 263 | custom.intreq = IF_RBF; |
| 264 | mb(); |
| 265 | |
| 266 | if((serdatr & 0x1ff) == 0) |
| 267 | status |= UART_LSR_BI; |
| 268 | if(serdatr & SDR_OVRUN) |
| 269 | status |= UART_LSR_OE; |
| 270 | |
| 271 | ch = serdatr & 0xff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | icount->rx++; |
| 273 | |
| 274 | #ifdef SERIAL_DEBUG_INTR |
| 275 | printk("DR%02x:%02x...", ch, status); |
| 276 | #endif |
Alan Cox | 33f0f88 | 2006-01-09 20:54:13 -0800 | [diff] [blame] | 277 | flag = TTY_NORMAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | |
| 279 | /* |
| 280 | * We don't handle parity or frame errors - but I have left |
| 281 | * the code in, since I'm not sure that the errors can't be |
| 282 | * detected. |
| 283 | */ |
| 284 | |
| 285 | if (status & (UART_LSR_BI | UART_LSR_PE | |
| 286 | UART_LSR_FE | UART_LSR_OE)) { |
| 287 | /* |
| 288 | * For statistics only |
| 289 | */ |
| 290 | if (status & UART_LSR_BI) { |
| 291 | status &= ~(UART_LSR_FE | UART_LSR_PE); |
| 292 | icount->brk++; |
| 293 | } else if (status & UART_LSR_PE) |
| 294 | icount->parity++; |
| 295 | else if (status & UART_LSR_FE) |
| 296 | icount->frame++; |
| 297 | if (status & UART_LSR_OE) |
| 298 | icount->overrun++; |
| 299 | |
| 300 | /* |
| 301 | * Now check to see if character should be |
| 302 | * ignored, and mask off conditions which |
| 303 | * should be ignored. |
| 304 | */ |
| 305 | if (status & info->ignore_status_mask) |
Alan Cox | 33f0f88 | 2006-01-09 20:54:13 -0800 | [diff] [blame] | 306 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | |
| 308 | status &= info->read_status_mask; |
| 309 | |
| 310 | if (status & (UART_LSR_BI)) { |
| 311 | #ifdef SERIAL_DEBUG_INTR |
| 312 | printk("handling break...."); |
| 313 | #endif |
Alan Cox | 33f0f88 | 2006-01-09 20:54:13 -0800 | [diff] [blame] | 314 | flag = TTY_BREAK; |
Jiri Slaby | 01bd730 | 2012-03-05 14:52:27 +0100 | [diff] [blame] | 315 | if (info->tport.flags & ASYNC_SAK) |
Jiri Slaby | 2e124b4 | 2013-01-03 15:53:06 +0100 | [diff] [blame] | 316 | do_SAK(info->tport.tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | } else if (status & UART_LSR_PE) |
Alan Cox | 33f0f88 | 2006-01-09 20:54:13 -0800 | [diff] [blame] | 318 | flag = TTY_PARITY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | else if (status & UART_LSR_FE) |
Alan Cox | 33f0f88 | 2006-01-09 20:54:13 -0800 | [diff] [blame] | 320 | flag = TTY_FRAME; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | if (status & UART_LSR_OE) { |
| 322 | /* |
| 323 | * Overrun is special, since it's |
| 324 | * reported immediately, and doesn't |
| 325 | * affect the current character |
| 326 | */ |
Alan Cox | 33f0f88 | 2006-01-09 20:54:13 -0800 | [diff] [blame] | 327 | oe = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | } |
| 329 | } |
Jiri Slaby | 92a19f9 | 2013-01-03 15:53:03 +0100 | [diff] [blame] | 330 | tty_insert_flip_char(&info->tport, ch, flag); |
Alan Cox | 33f0f88 | 2006-01-09 20:54:13 -0800 | [diff] [blame] | 331 | if (oe == 1) |
Jiri Slaby | 92a19f9 | 2013-01-03 15:53:03 +0100 | [diff] [blame] | 332 | tty_insert_flip_char(&info->tport, 0, TTY_OVERRUN); |
Jiri Slaby | 2e124b4 | 2013-01-03 15:53:06 +0100 | [diff] [blame] | 333 | tty_flip_buffer_push(&info->tport); |
Alan Cox | 33f0f88 | 2006-01-09 20:54:13 -0800 | [diff] [blame] | 334 | out: |
| 335 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | } |
| 337 | |
Jiri Slaby | 916b765 | 2012-03-05 14:52:20 +0100 | [diff] [blame] | 338 | static void transmit_chars(struct serial_state *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | { |
| 340 | custom.intreq = IF_TBE; |
| 341 | mb(); |
| 342 | if (info->x_char) { |
| 343 | custom.serdat = info->x_char | 0x100; |
| 344 | mb(); |
Jiri Slaby | 916b765 | 2012-03-05 14:52:20 +0100 | [diff] [blame] | 345 | info->icount.tx++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | info->x_char = 0; |
| 347 | return; |
| 348 | } |
| 349 | if (info->xmit.head == info->xmit.tail |
Jiri Slaby | 8775879 | 2012-03-05 14:52:24 +0100 | [diff] [blame] | 350 | || info->tport.tty->stopped |
| 351 | || info->tport.tty->hw_stopped) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | info->IER &= ~UART_IER_THRI; |
| 353 | custom.intena = IF_TBE; |
| 354 | mb(); |
| 355 | return; |
| 356 | } |
| 357 | |
| 358 | custom.serdat = info->xmit.buf[info->xmit.tail++] | 0x100; |
| 359 | mb(); |
| 360 | info->xmit.tail = info->xmit.tail & (SERIAL_XMIT_SIZE-1); |
Jiri Slaby | 916b765 | 2012-03-05 14:52:20 +0100 | [diff] [blame] | 361 | info->icount.tx++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | |
| 363 | if (CIRC_CNT(info->xmit.head, |
| 364 | info->xmit.tail, |
| 365 | SERIAL_XMIT_SIZE) < WAKEUP_CHARS) |
Jiri Slaby | 8775879 | 2012-03-05 14:52:24 +0100 | [diff] [blame] | 366 | tty_wakeup(info->tport.tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | |
| 368 | #ifdef SERIAL_DEBUG_INTR |
| 369 | printk("THRE..."); |
| 370 | #endif |
| 371 | if (info->xmit.head == info->xmit.tail) { |
| 372 | custom.intena = IF_TBE; |
| 373 | mb(); |
| 374 | info->IER &= ~UART_IER_THRI; |
| 375 | } |
| 376 | } |
| 377 | |
Jiri Slaby | 916b765 | 2012-03-05 14:52:20 +0100 | [diff] [blame] | 378 | static void check_modem_status(struct serial_state *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | { |
Jiri Slaby | 7188dc2 | 2012-03-05 14:52:43 +0100 | [diff] [blame] | 380 | struct tty_port *port = &info->tport; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | unsigned char status = ciab.pra & (SER_DCD | SER_CTS | SER_DSR); |
| 382 | unsigned char dstatus; |
| 383 | struct async_icount *icount; |
| 384 | |
| 385 | /* Determine bits that have changed */ |
| 386 | dstatus = status ^ current_ctl_bits; |
| 387 | current_ctl_bits = status; |
| 388 | |
| 389 | if (dstatus) { |
Jiri Slaby | 916b765 | 2012-03-05 14:52:20 +0100 | [diff] [blame] | 390 | icount = &info->icount; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | /* update input line counters */ |
| 392 | if (dstatus & SER_DSR) |
| 393 | icount->dsr++; |
| 394 | if (dstatus & SER_DCD) { |
| 395 | icount->dcd++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | } |
| 397 | if (dstatus & SER_CTS) |
| 398 | icount->cts++; |
Jiri Slaby | 7188dc2 | 2012-03-05 14:52:43 +0100 | [diff] [blame] | 399 | wake_up_interruptible(&port->delta_msr_wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | } |
| 401 | |
Peter Hurley | 2d68655 | 2016-04-09 17:53:23 -0700 | [diff] [blame] | 402 | if (tty_port_check_carrier(port) && (dstatus & SER_DCD)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | #if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR)) |
| 404 | printk("ttyS%d CD now %s...", info->line, |
| 405 | (!(status & SER_DCD)) ? "on" : "off"); |
| 406 | #endif |
| 407 | if (!(status & SER_DCD)) |
Jiri Slaby | 7188dc2 | 2012-03-05 14:52:43 +0100 | [diff] [blame] | 408 | wake_up_interruptible(&port->open_wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | else { |
| 410 | #ifdef SERIAL_DEBUG_OPEN |
| 411 | printk("doing serial hangup..."); |
| 412 | #endif |
Jiri Slaby | 7188dc2 | 2012-03-05 14:52:43 +0100 | [diff] [blame] | 413 | if (port->tty) |
| 414 | tty_hangup(port->tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | } |
| 416 | } |
Huang Shijie | f21ec3d | 2012-08-22 22:13:36 -0400 | [diff] [blame] | 417 | if (tty_port_cts_enabled(port)) { |
Jiri Slaby | 7188dc2 | 2012-03-05 14:52:43 +0100 | [diff] [blame] | 418 | if (port->tty->hw_stopped) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | if (!(status & SER_CTS)) { |
| 420 | #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW)) |
| 421 | printk("CTS tx start..."); |
| 422 | #endif |
Jiri Slaby | 7188dc2 | 2012-03-05 14:52:43 +0100 | [diff] [blame] | 423 | port->tty->hw_stopped = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | info->IER |= UART_IER_THRI; |
| 425 | custom.intena = IF_SETCLR | IF_TBE; |
| 426 | mb(); |
| 427 | /* set a pending Tx Interrupt, transmitter should restart now */ |
| 428 | custom.intreq = IF_SETCLR | IF_TBE; |
| 429 | mb(); |
Jiri Slaby | 7188dc2 | 2012-03-05 14:52:43 +0100 | [diff] [blame] | 430 | tty_wakeup(port->tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | return; |
| 432 | } |
| 433 | } else { |
| 434 | if ((status & SER_CTS)) { |
| 435 | #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW)) |
| 436 | printk("CTS tx stop..."); |
| 437 | #endif |
Jiri Slaby | 7188dc2 | 2012-03-05 14:52:43 +0100 | [diff] [blame] | 438 | port->tty->hw_stopped = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | info->IER &= ~UART_IER_THRI; |
| 440 | /* disable Tx interrupt and remove any pending interrupts */ |
| 441 | custom.intena = IF_TBE; |
| 442 | mb(); |
| 443 | custom.intreq = IF_TBE; |
| 444 | mb(); |
| 445 | } |
| 446 | } |
| 447 | } |
| 448 | } |
| 449 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 450 | static irqreturn_t ser_vbl_int( int irq, void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | { |
| 452 | /* vbl is just a periodic interrupt we tie into to update modem status */ |
Jiri Slaby | 916b765 | 2012-03-05 14:52:20 +0100 | [diff] [blame] | 453 | struct serial_state *info = data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | /* |
| 455 | * TBD - is it better to unregister from this interrupt or to |
| 456 | * ignore it if MSI is clear ? |
| 457 | */ |
| 458 | if(info->IER & UART_IER_MSI) |
| 459 | check_modem_status(info); |
| 460 | return IRQ_HANDLED; |
| 461 | } |
| 462 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 463 | static irqreturn_t ser_rx_int(int irq, void *dev_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | { |
Jiri Slaby | 916b765 | 2012-03-05 14:52:20 +0100 | [diff] [blame] | 465 | struct serial_state *info = dev_id; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | |
| 467 | #ifdef SERIAL_DEBUG_INTR |
| 468 | printk("ser_rx_int..."); |
| 469 | #endif |
| 470 | |
Jiri Slaby | 8775879 | 2012-03-05 14:52:24 +0100 | [diff] [blame] | 471 | if (!info->tport.tty) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | return IRQ_NONE; |
| 473 | |
| 474 | receive_chars(info); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | #ifdef SERIAL_DEBUG_INTR |
| 476 | printk("end.\n"); |
| 477 | #endif |
| 478 | return IRQ_HANDLED; |
| 479 | } |
| 480 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 481 | static irqreturn_t ser_tx_int(int irq, void *dev_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | { |
Jiri Slaby | 916b765 | 2012-03-05 14:52:20 +0100 | [diff] [blame] | 483 | struct serial_state *info = dev_id; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | |
| 485 | if (custom.serdatr & SDR_TBE) { |
| 486 | #ifdef SERIAL_DEBUG_INTR |
| 487 | printk("ser_tx_int..."); |
| 488 | #endif |
| 489 | |
Jiri Slaby | 8775879 | 2012-03-05 14:52:24 +0100 | [diff] [blame] | 490 | if (!info->tport.tty) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | return IRQ_NONE; |
| 492 | |
| 493 | transmit_chars(info); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | #ifdef SERIAL_DEBUG_INTR |
| 495 | printk("end.\n"); |
| 496 | #endif |
| 497 | } |
| 498 | return IRQ_HANDLED; |
| 499 | } |
| 500 | |
| 501 | /* |
| 502 | * ------------------------------------------------------------------- |
| 503 | * Here ends the serial interrupt routines. |
| 504 | * ------------------------------------------------------------------- |
| 505 | */ |
| 506 | |
| 507 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | * --------------------------------------------------------------- |
| 509 | * Low level utility subroutines for the serial driver: routines to |
| 510 | * figure out the appropriate timeout for an interrupt chain, routines |
| 511 | * to initialize and startup a serial port, and routines to shutdown a |
| 512 | * serial port. Useful stuff like that. |
| 513 | * --------------------------------------------------------------- |
| 514 | */ |
| 515 | |
Jiri Slaby | 588993d | 2012-03-05 14:52:22 +0100 | [diff] [blame] | 516 | static int startup(struct tty_struct *tty, struct serial_state *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 517 | { |
Jiri Slaby | 01bd730 | 2012-03-05 14:52:27 +0100 | [diff] [blame] | 518 | struct tty_port *port = &info->tport; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | unsigned long flags; |
| 520 | int retval=0; |
| 521 | unsigned long page; |
| 522 | |
| 523 | page = get_zeroed_page(GFP_KERNEL); |
| 524 | if (!page) |
| 525 | return -ENOMEM; |
| 526 | |
| 527 | local_irq_save(flags); |
| 528 | |
Peter Hurley | d41861c | 2016-04-09 17:53:25 -0700 | [diff] [blame] | 529 | if (tty_port_initialized(port)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | free_page(page); |
| 531 | goto errout; |
| 532 | } |
| 533 | |
| 534 | if (info->xmit.buf) |
| 535 | free_page(page); |
| 536 | else |
| 537 | info->xmit.buf = (unsigned char *) page; |
| 538 | |
| 539 | #ifdef SERIAL_DEBUG_OPEN |
| 540 | printk("starting up ttys%d ...", info->line); |
| 541 | #endif |
| 542 | |
| 543 | /* Clear anything in the input buffer */ |
| 544 | |
| 545 | custom.intreq = IF_RBF; |
| 546 | mb(); |
| 547 | |
| 548 | retval = request_irq(IRQ_AMIGA_VERTB, ser_vbl_int, 0, "serial status", info); |
| 549 | if (retval) { |
| 550 | if (serial_isroot()) { |
Jiri Slaby | 588993d | 2012-03-05 14:52:22 +0100 | [diff] [blame] | 551 | set_bit(TTY_IO_ERROR, &tty->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 552 | retval = 0; |
| 553 | } |
| 554 | goto errout; |
| 555 | } |
| 556 | |
| 557 | /* enable both Rx and Tx interrupts */ |
| 558 | custom.intena = IF_SETCLR | IF_RBF | IF_TBE; |
| 559 | mb(); |
| 560 | info->IER = UART_IER_MSI; |
| 561 | |
| 562 | /* remember current state of the DCD and CTS bits */ |
| 563 | current_ctl_bits = ciab.pra & (SER_DCD | SER_CTS | SER_DSR); |
| 564 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | info->MCR = 0; |
Jiri Slaby | 588993d | 2012-03-05 14:52:22 +0100 | [diff] [blame] | 566 | if (C_BAUD(tty)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | info->MCR = SER_DTR | SER_RTS; |
| 568 | rtsdtr_ctrl(info->MCR); |
| 569 | |
Jiri Slaby | 588993d | 2012-03-05 14:52:22 +0100 | [diff] [blame] | 570 | clear_bit(TTY_IO_ERROR, &tty->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | info->xmit.head = info->xmit.tail = 0; |
| 572 | |
| 573 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 574 | * and set the speed of the serial port |
| 575 | */ |
Jiri Slaby | 588993d | 2012-03-05 14:52:22 +0100 | [diff] [blame] | 576 | change_speed(tty, info, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | |
Peter Hurley | d41861c | 2016-04-09 17:53:25 -0700 | [diff] [blame] | 578 | tty_port_set_initialized(port, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | local_irq_restore(flags); |
| 580 | return 0; |
| 581 | |
| 582 | errout: |
| 583 | local_irq_restore(flags); |
| 584 | return retval; |
| 585 | } |
| 586 | |
| 587 | /* |
| 588 | * This routine will shutdown a serial port; interrupts are disabled, and |
| 589 | * DTR is dropped if the hangup on close termio flag is on. |
| 590 | */ |
Jiri Slaby | 588993d | 2012-03-05 14:52:22 +0100 | [diff] [blame] | 591 | static void shutdown(struct tty_struct *tty, struct serial_state *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 592 | { |
| 593 | unsigned long flags; |
| 594 | struct serial_state *state; |
| 595 | |
Peter Hurley | d41861c | 2016-04-09 17:53:25 -0700 | [diff] [blame] | 596 | if (!tty_port_initialized(&info->tport)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | return; |
| 598 | |
Jiri Slaby | 916b765 | 2012-03-05 14:52:20 +0100 | [diff] [blame] | 599 | state = info; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 600 | |
| 601 | #ifdef SERIAL_DEBUG_OPEN |
| 602 | printk("Shutting down serial port %d ....\n", info->line); |
| 603 | #endif |
| 604 | |
| 605 | local_irq_save(flags); /* Disable interrupts */ |
| 606 | |
| 607 | /* |
| 608 | * clear delta_msr_wait queue to avoid mem leaks: we may free the irq |
| 609 | * here so the queue might never be waken up |
| 610 | */ |
Jiri Slaby | 8775879 | 2012-03-05 14:52:24 +0100 | [diff] [blame] | 611 | wake_up_interruptible(&info->tport.delta_msr_wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | /* |
| 614 | * Free the IRQ, if necessary |
| 615 | */ |
| 616 | free_irq(IRQ_AMIGA_VERTB, info); |
| 617 | |
| 618 | if (info->xmit.buf) { |
| 619 | free_page((unsigned long) info->xmit.buf); |
| 620 | info->xmit.buf = NULL; |
| 621 | } |
| 622 | |
| 623 | info->IER = 0; |
| 624 | custom.intena = IF_RBF | IF_TBE; |
| 625 | mb(); |
| 626 | |
| 627 | /* disable break condition */ |
| 628 | custom.adkcon = AC_UARTBRK; |
| 629 | mb(); |
| 630 | |
Peter Hurley | 9db276f | 2016-01-10 20:36:15 -0800 | [diff] [blame] | 631 | if (C_HUPCL(tty)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 632 | info->MCR &= ~(SER_DTR|SER_RTS); |
| 633 | rtsdtr_ctrl(info->MCR); |
| 634 | |
Jiri Slaby | 588993d | 2012-03-05 14:52:22 +0100 | [diff] [blame] | 635 | set_bit(TTY_IO_ERROR, &tty->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 636 | |
Peter Hurley | d41861c | 2016-04-09 17:53:25 -0700 | [diff] [blame] | 637 | tty_port_set_initialized(&info->tport, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 638 | local_irq_restore(flags); |
| 639 | } |
| 640 | |
| 641 | |
| 642 | /* |
| 643 | * This routine is called to set the UART divisor registers to match |
| 644 | * the specified baud rate for a serial port. |
| 645 | */ |
Jiri Slaby | 588993d | 2012-03-05 14:52:22 +0100 | [diff] [blame] | 646 | static void change_speed(struct tty_struct *tty, struct serial_state *info, |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 647 | struct ktermios *old_termios) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 648 | { |
Jiri Slaby | 01bd730 | 2012-03-05 14:52:27 +0100 | [diff] [blame] | 649 | struct tty_port *port = &info->tport; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | int quot = 0, baud_base, baud; |
| 651 | unsigned cflag, cval = 0; |
| 652 | int bits; |
| 653 | unsigned long flags; |
| 654 | |
Alan Cox | adc8d74 | 2012-07-14 15:31:47 +0100 | [diff] [blame] | 655 | cflag = tty->termios.c_cflag; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 656 | |
| 657 | /* Byte size is always 8 bits plus parity bit if requested */ |
| 658 | |
| 659 | cval = 3; bits = 10; |
| 660 | if (cflag & CSTOPB) { |
| 661 | cval |= 0x04; |
| 662 | bits++; |
| 663 | } |
| 664 | if (cflag & PARENB) { |
| 665 | cval |= UART_LCR_PARITY; |
| 666 | bits++; |
| 667 | } |
| 668 | if (!(cflag & PARODD)) |
| 669 | cval |= UART_LCR_EPAR; |
| 670 | #ifdef CMSPAR |
| 671 | if (cflag & CMSPAR) |
| 672 | cval |= UART_LCR_SPAR; |
| 673 | #endif |
| 674 | |
| 675 | /* Determine divisor based on baud rate */ |
Jiri Slaby | 588993d | 2012-03-05 14:52:22 +0100 | [diff] [blame] | 676 | baud = tty_get_baud_rate(tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | if (!baud) |
| 678 | baud = 9600; /* B0 transition handled in rs_set_termios */ |
Jiri Slaby | 916b765 | 2012-03-05 14:52:20 +0100 | [diff] [blame] | 679 | baud_base = info->baud_base; |
Jiri Slaby | 01bd730 | 2012-03-05 14:52:27 +0100 | [diff] [blame] | 680 | if (baud == 38400 && (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST) |
Jiri Slaby | 916b765 | 2012-03-05 14:52:20 +0100 | [diff] [blame] | 681 | quot = info->custom_divisor; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 682 | else { |
| 683 | if (baud == 134) |
| 684 | /* Special case since 134 is really 134.5 */ |
| 685 | quot = (2*baud_base / 269); |
| 686 | else if (baud) |
| 687 | quot = baud_base / baud; |
| 688 | } |
| 689 | /* If the quotient is zero refuse the change */ |
| 690 | if (!quot && old_termios) { |
Alan Cox | db0ef08 | 2007-07-15 23:41:47 -0700 | [diff] [blame] | 691 | /* FIXME: Will need updating for new tty in the end */ |
Alan Cox | adc8d74 | 2012-07-14 15:31:47 +0100 | [diff] [blame] | 692 | tty->termios.c_cflag &= ~CBAUD; |
| 693 | tty->termios.c_cflag |= (old_termios->c_cflag & CBAUD); |
Jiri Slaby | 588993d | 2012-03-05 14:52:22 +0100 | [diff] [blame] | 694 | baud = tty_get_baud_rate(tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 695 | if (!baud) |
| 696 | baud = 9600; |
| 697 | if (baud == 38400 && |
Jiri Slaby | 01bd730 | 2012-03-05 14:52:27 +0100 | [diff] [blame] | 698 | (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST) |
Jiri Slaby | 916b765 | 2012-03-05 14:52:20 +0100 | [diff] [blame] | 699 | quot = info->custom_divisor; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | else { |
| 701 | if (baud == 134) |
| 702 | /* Special case since 134 is really 134.5 */ |
| 703 | quot = (2*baud_base / 269); |
| 704 | else if (baud) |
| 705 | quot = baud_base / baud; |
| 706 | } |
| 707 | } |
| 708 | /* As a last resort, if the quotient is zero, default to 9600 bps */ |
| 709 | if (!quot) |
| 710 | quot = baud_base / 9600; |
| 711 | info->quot = quot; |
Jiri Slaby | 916b765 | 2012-03-05 14:52:20 +0100 | [diff] [blame] | 712 | info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | info->timeout += HZ/50; /* Add .02 seconds of slop */ |
| 714 | |
| 715 | /* CTS flow control flag and modem status interrupts */ |
| 716 | info->IER &= ~UART_IER_MSI; |
Jiri Slaby | 01bd730 | 2012-03-05 14:52:27 +0100 | [diff] [blame] | 717 | if (port->flags & ASYNC_HARDPPS_CD) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 718 | info->IER |= UART_IER_MSI; |
Peter Hurley | 5604a98 | 2016-04-09 17:53:21 -0700 | [diff] [blame] | 719 | tty_port_set_cts_flow(port, cflag & CRTSCTS); |
| 720 | if (cflag & CRTSCTS) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | info->IER |= UART_IER_MSI; |
Peter Hurley | 2d68655 | 2016-04-09 17:53:23 -0700 | [diff] [blame] | 722 | tty_port_set_check_carrier(port, ~cflag & CLOCAL); |
| 723 | if (~cflag & CLOCAL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 724 | info->IER |= UART_IER_MSI; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | /* TBD: |
Thadeu Lima de Souza Cascardo | 4b512d2 | 2009-04-14 23:14:10 -0300 | [diff] [blame] | 726 | * Does clearing IER_MSI imply that we should disable the VBL interrupt ? |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 727 | */ |
| 728 | |
| 729 | /* |
| 730 | * Set up parity check flag |
| 731 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | |
| 733 | info->read_status_mask = UART_LSR_OE | UART_LSR_DR; |
Jiri Slaby | 588993d | 2012-03-05 14:52:22 +0100 | [diff] [blame] | 734 | if (I_INPCK(tty)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | info->read_status_mask |= UART_LSR_FE | UART_LSR_PE; |
Jiri Slaby | 588993d | 2012-03-05 14:52:22 +0100 | [diff] [blame] | 736 | if (I_BRKINT(tty) || I_PARMRK(tty)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 737 | info->read_status_mask |= UART_LSR_BI; |
| 738 | |
| 739 | /* |
| 740 | * Characters to ignore |
| 741 | */ |
| 742 | info->ignore_status_mask = 0; |
Jiri Slaby | 588993d | 2012-03-05 14:52:22 +0100 | [diff] [blame] | 743 | if (I_IGNPAR(tty)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 744 | info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; |
Jiri Slaby | 588993d | 2012-03-05 14:52:22 +0100 | [diff] [blame] | 745 | if (I_IGNBRK(tty)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | info->ignore_status_mask |= UART_LSR_BI; |
| 747 | /* |
| 748 | * If we're ignore parity and break indicators, ignore |
| 749 | * overruns too. (For real raw support). |
| 750 | */ |
Jiri Slaby | 588993d | 2012-03-05 14:52:22 +0100 | [diff] [blame] | 751 | if (I_IGNPAR(tty)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 752 | info->ignore_status_mask |= UART_LSR_OE; |
| 753 | } |
| 754 | /* |
| 755 | * !!! ignore all characters if CREAD is not set |
| 756 | */ |
| 757 | if ((cflag & CREAD) == 0) |
| 758 | info->ignore_status_mask |= UART_LSR_DR; |
| 759 | local_irq_save(flags); |
| 760 | |
| 761 | { |
| 762 | short serper; |
| 763 | |
| 764 | /* Set up the baud rate */ |
| 765 | serper = quot - 1; |
| 766 | |
| 767 | /* Enable or disable parity bit */ |
| 768 | |
| 769 | if(cval & UART_LCR_PARITY) |
| 770 | serper |= (SERPER_PARENB); |
| 771 | |
| 772 | custom.serper = serper; |
| 773 | mb(); |
| 774 | } |
| 775 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 776 | local_irq_restore(flags); |
| 777 | } |
| 778 | |
Alan Cox | 257afa3 | 2008-04-30 00:54:02 -0700 | [diff] [blame] | 779 | static int rs_put_char(struct tty_struct *tty, unsigned char ch) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | { |
Jiri Slaby | 916b765 | 2012-03-05 14:52:20 +0100 | [diff] [blame] | 781 | struct serial_state *info; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 782 | unsigned long flags; |
| 783 | |
TINNES Julien RD-MAPS-ISS | d9ad7ef | 2005-06-23 00:10:08 -0700 | [diff] [blame] | 784 | info = tty->driver_data; |
| 785 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | if (serial_paranoia_check(info, tty->name, "rs_put_char")) |
Alan Cox | 257afa3 | 2008-04-30 00:54:02 -0700 | [diff] [blame] | 787 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 788 | |
TINNES Julien RD-MAPS-ISS | d9ad7ef | 2005-06-23 00:10:08 -0700 | [diff] [blame] | 789 | if (!info->xmit.buf) |
Alan Cox | 257afa3 | 2008-04-30 00:54:02 -0700 | [diff] [blame] | 790 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 791 | |
| 792 | local_irq_save(flags); |
| 793 | if (CIRC_SPACE(info->xmit.head, |
| 794 | info->xmit.tail, |
| 795 | SERIAL_XMIT_SIZE) == 0) { |
| 796 | local_irq_restore(flags); |
Alan Cox | 257afa3 | 2008-04-30 00:54:02 -0700 | [diff] [blame] | 797 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | } |
| 799 | |
| 800 | info->xmit.buf[info->xmit.head++] = ch; |
| 801 | info->xmit.head &= SERIAL_XMIT_SIZE-1; |
| 802 | local_irq_restore(flags); |
Alan Cox | 257afa3 | 2008-04-30 00:54:02 -0700 | [diff] [blame] | 803 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 804 | } |
| 805 | |
| 806 | static void rs_flush_chars(struct tty_struct *tty) |
| 807 | { |
Jiri Slaby | 916b765 | 2012-03-05 14:52:20 +0100 | [diff] [blame] | 808 | struct serial_state *info = tty->driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 809 | unsigned long flags; |
| 810 | |
| 811 | if (serial_paranoia_check(info, tty->name, "rs_flush_chars")) |
| 812 | return; |
| 813 | |
| 814 | if (info->xmit.head == info->xmit.tail |
| 815 | || tty->stopped |
| 816 | || tty->hw_stopped |
| 817 | || !info->xmit.buf) |
| 818 | return; |
| 819 | |
| 820 | local_irq_save(flags); |
| 821 | info->IER |= UART_IER_THRI; |
| 822 | custom.intena = IF_SETCLR | IF_TBE; |
| 823 | mb(); |
| 824 | /* set a pending Tx Interrupt, transmitter should restart now */ |
| 825 | custom.intreq = IF_SETCLR | IF_TBE; |
| 826 | mb(); |
| 827 | local_irq_restore(flags); |
| 828 | } |
| 829 | |
| 830 | static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count) |
| 831 | { |
| 832 | int c, ret = 0; |
Jiri Slaby | 916b765 | 2012-03-05 14:52:20 +0100 | [diff] [blame] | 833 | struct serial_state *info = tty->driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 834 | unsigned long flags; |
| 835 | |
| 836 | if (serial_paranoia_check(info, tty->name, "rs_write")) |
| 837 | return 0; |
| 838 | |
Jiri Slaby | b3218a7 | 2006-10-04 02:15:27 -0700 | [diff] [blame] | 839 | if (!info->xmit.buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | return 0; |
| 841 | |
Jiri Kosina | 3abf3be | 2007-02-10 01:46:48 -0800 | [diff] [blame] | 842 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 843 | while (1) { |
| 844 | c = CIRC_SPACE_TO_END(info->xmit.head, |
| 845 | info->xmit.tail, |
| 846 | SERIAL_XMIT_SIZE); |
| 847 | if (count < c) |
| 848 | c = count; |
| 849 | if (c <= 0) { |
| 850 | break; |
| 851 | } |
| 852 | memcpy(info->xmit.buf + info->xmit.head, buf, c); |
| 853 | info->xmit.head = ((info->xmit.head + c) & |
| 854 | (SERIAL_XMIT_SIZE-1)); |
| 855 | buf += c; |
| 856 | count -= c; |
| 857 | ret += c; |
| 858 | } |
| 859 | local_irq_restore(flags); |
| 860 | |
| 861 | if (info->xmit.head != info->xmit.tail |
| 862 | && !tty->stopped |
| 863 | && !tty->hw_stopped |
| 864 | && !(info->IER & UART_IER_THRI)) { |
| 865 | info->IER |= UART_IER_THRI; |
| 866 | local_irq_disable(); |
| 867 | custom.intena = IF_SETCLR | IF_TBE; |
| 868 | mb(); |
| 869 | /* set a pending Tx Interrupt, transmitter should restart now */ |
| 870 | custom.intreq = IF_SETCLR | IF_TBE; |
| 871 | mb(); |
| 872 | local_irq_restore(flags); |
| 873 | } |
| 874 | return ret; |
| 875 | } |
| 876 | |
| 877 | static int rs_write_room(struct tty_struct *tty) |
| 878 | { |
Jiri Slaby | 916b765 | 2012-03-05 14:52:20 +0100 | [diff] [blame] | 879 | struct serial_state *info = tty->driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 880 | |
| 881 | if (serial_paranoia_check(info, tty->name, "rs_write_room")) |
| 882 | return 0; |
| 883 | return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); |
| 884 | } |
| 885 | |
| 886 | static int rs_chars_in_buffer(struct tty_struct *tty) |
| 887 | { |
Jiri Slaby | 916b765 | 2012-03-05 14:52:20 +0100 | [diff] [blame] | 888 | struct serial_state *info = tty->driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 889 | |
| 890 | if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer")) |
| 891 | return 0; |
| 892 | return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); |
| 893 | } |
| 894 | |
| 895 | static void rs_flush_buffer(struct tty_struct *tty) |
| 896 | { |
Jiri Slaby | 916b765 | 2012-03-05 14:52:20 +0100 | [diff] [blame] | 897 | struct serial_state *info = tty->driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 898 | unsigned long flags; |
| 899 | |
| 900 | if (serial_paranoia_check(info, tty->name, "rs_flush_buffer")) |
| 901 | return; |
| 902 | local_irq_save(flags); |
| 903 | info->xmit.head = info->xmit.tail = 0; |
| 904 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 905 | tty_wakeup(tty); |
| 906 | } |
| 907 | |
| 908 | /* |
| 909 | * This function is used to send a high-priority XON/XOFF character to |
| 910 | * the device |
| 911 | */ |
| 912 | static void rs_send_xchar(struct tty_struct *tty, char ch) |
| 913 | { |
Jiri Slaby | 916b765 | 2012-03-05 14:52:20 +0100 | [diff] [blame] | 914 | struct serial_state *info = tty->driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 915 | unsigned long flags; |
| 916 | |
Julia Lawall | 1d6a5e4 | 2014-12-07 20:20:48 +0100 | [diff] [blame] | 917 | if (serial_paranoia_check(info, tty->name, "rs_send_xchar")) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 918 | return; |
| 919 | |
| 920 | info->x_char = ch; |
| 921 | if (ch) { |
| 922 | /* Make sure transmit interrupts are on */ |
| 923 | |
| 924 | /* Check this ! */ |
| 925 | local_irq_save(flags); |
| 926 | if(!(custom.intenar & IF_TBE)) { |
| 927 | custom.intena = IF_SETCLR | IF_TBE; |
| 928 | mb(); |
| 929 | /* set a pending Tx Interrupt, transmitter should restart now */ |
| 930 | custom.intreq = IF_SETCLR | IF_TBE; |
| 931 | mb(); |
| 932 | } |
| 933 | local_irq_restore(flags); |
| 934 | |
| 935 | info->IER |= UART_IER_THRI; |
| 936 | } |
| 937 | } |
| 938 | |
| 939 | /* |
| 940 | * ------------------------------------------------------------ |
| 941 | * rs_throttle() |
| 942 | * |
| 943 | * This routine is called by the upper-layer tty layer to signal that |
| 944 | * incoming characters should be throttled. |
| 945 | * ------------------------------------------------------------ |
| 946 | */ |
| 947 | static void rs_throttle(struct tty_struct * tty) |
| 948 | { |
Jiri Slaby | 916b765 | 2012-03-05 14:52:20 +0100 | [diff] [blame] | 949 | struct serial_state *info = tty->driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 950 | unsigned long flags; |
| 951 | #ifdef SERIAL_DEBUG_THROTTLE |
Peter Hurley | fdfb719 | 2016-01-10 22:40:54 -0800 | [diff] [blame] | 952 | printk("throttle %s ....\n", tty_name(tty)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 953 | #endif |
| 954 | |
| 955 | if (serial_paranoia_check(info, tty->name, "rs_throttle")) |
| 956 | return; |
| 957 | |
| 958 | if (I_IXOFF(tty)) |
| 959 | rs_send_xchar(tty, STOP_CHAR(tty)); |
| 960 | |
Peter Hurley | 9db276f | 2016-01-10 20:36:15 -0800 | [diff] [blame] | 961 | if (C_CRTSCTS(tty)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 962 | info->MCR &= ~SER_RTS; |
| 963 | |
| 964 | local_irq_save(flags); |
| 965 | rtsdtr_ctrl(info->MCR); |
| 966 | local_irq_restore(flags); |
| 967 | } |
| 968 | |
| 969 | static void rs_unthrottle(struct tty_struct * tty) |
| 970 | { |
Jiri Slaby | 916b765 | 2012-03-05 14:52:20 +0100 | [diff] [blame] | 971 | struct serial_state *info = tty->driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 972 | unsigned long flags; |
| 973 | #ifdef SERIAL_DEBUG_THROTTLE |
Peter Hurley | fdfb719 | 2016-01-10 22:40:54 -0800 | [diff] [blame] | 974 | printk("unthrottle %s ....\n", tty_name(tty)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 975 | #endif |
| 976 | |
| 977 | if (serial_paranoia_check(info, tty->name, "rs_unthrottle")) |
| 978 | return; |
| 979 | |
| 980 | if (I_IXOFF(tty)) { |
| 981 | if (info->x_char) |
| 982 | info->x_char = 0; |
| 983 | else |
| 984 | rs_send_xchar(tty, START_CHAR(tty)); |
| 985 | } |
Peter Hurley | 9db276f | 2016-01-10 20:36:15 -0800 | [diff] [blame] | 986 | if (C_CRTSCTS(tty)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 987 | info->MCR |= SER_RTS; |
| 988 | local_irq_save(flags); |
| 989 | rtsdtr_ctrl(info->MCR); |
| 990 | local_irq_restore(flags); |
| 991 | } |
| 992 | |
| 993 | /* |
| 994 | * ------------------------------------------------------------ |
| 995 | * rs_ioctl() and friends |
| 996 | * ------------------------------------------------------------ |
| 997 | */ |
| 998 | |
Jiri Slaby | ff169e5 | 2012-03-05 14:52:44 +0100 | [diff] [blame] | 999 | static int get_serial_info(struct tty_struct *tty, struct serial_state *state, |
Al Viro | ab14cae | 2006-01-12 01:06:30 -0800 | [diff] [blame] | 1000 | struct serial_struct __user * retinfo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1001 | { |
| 1002 | struct serial_struct tmp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1003 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1004 | memset(&tmp, 0, sizeof(tmp)); |
Alan Cox | 89c8d91 | 2012-08-08 16:30:13 +0100 | [diff] [blame] | 1005 | tty_lock(tty); |
Jiri Slaby | ff169e5 | 2012-03-05 14:52:44 +0100 | [diff] [blame] | 1006 | tmp.line = tty->index; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1007 | tmp.port = state->port; |
Jiri Slaby | 01bd730 | 2012-03-05 14:52:27 +0100 | [diff] [blame] | 1008 | tmp.flags = state->tport.flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1009 | tmp.xmit_fifo_size = state->xmit_fifo_size; |
| 1010 | tmp.baud_base = state->baud_base; |
Jiri Slaby | 799be6f | 2012-03-05 14:52:25 +0100 | [diff] [blame] | 1011 | tmp.close_delay = state->tport.close_delay; |
| 1012 | tmp.closing_wait = state->tport.closing_wait; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1013 | tmp.custom_divisor = state->custom_divisor; |
Alan Cox | 89c8d91 | 2012-08-08 16:30:13 +0100 | [diff] [blame] | 1014 | tty_unlock(tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1015 | if (copy_to_user(retinfo,&tmp,sizeof(*retinfo))) |
| 1016 | return -EFAULT; |
| 1017 | return 0; |
| 1018 | } |
| 1019 | |
Jiri Slaby | 588993d | 2012-03-05 14:52:22 +0100 | [diff] [blame] | 1020 | static int set_serial_info(struct tty_struct *tty, struct serial_state *state, |
Al Viro | ab14cae | 2006-01-12 01:06:30 -0800 | [diff] [blame] | 1021 | struct serial_struct __user * new_info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1022 | { |
Jiri Slaby | 01bd730 | 2012-03-05 14:52:27 +0100 | [diff] [blame] | 1023 | struct tty_port *port = &state->tport; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1024 | struct serial_struct new_serial; |
Jiri Slaby | 0f9b968 | 2012-03-05 14:52:21 +0100 | [diff] [blame] | 1025 | bool change_spd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1026 | int retval = 0; |
| 1027 | |
| 1028 | if (copy_from_user(&new_serial,new_info,sizeof(new_serial))) |
| 1029 | return -EFAULT; |
Alan Cox | e18ce49 | 2008-04-30 00:53:16 -0700 | [diff] [blame] | 1030 | |
Alan Cox | 89c8d91 | 2012-08-08 16:30:13 +0100 | [diff] [blame] | 1031 | tty_lock(tty); |
Jiri Slaby | 01bd730 | 2012-03-05 14:52:27 +0100 | [diff] [blame] | 1032 | change_spd = ((new_serial.flags ^ port->flags) & ASYNC_SPD_MASK) || |
Jiri Slaby | 0f9b968 | 2012-03-05 14:52:21 +0100 | [diff] [blame] | 1033 | new_serial.custom_divisor != state->custom_divisor; |
Jiri Slaby | ff169e5 | 2012-03-05 14:52:44 +0100 | [diff] [blame] | 1034 | if (new_serial.irq || new_serial.port != state->port || |
Jiri Slaby | 0f9b968 | 2012-03-05 14:52:21 +0100 | [diff] [blame] | 1035 | new_serial.xmit_fifo_size != state->xmit_fifo_size) { |
Alan Cox | 89c8d91 | 2012-08-08 16:30:13 +0100 | [diff] [blame] | 1036 | tty_unlock(tty); |
Jiri Slaby | 0f9b968 | 2012-03-05 14:52:21 +0100 | [diff] [blame] | 1037 | return -EINVAL; |
Alan Cox | e18ce49 | 2008-04-30 00:53:16 -0700 | [diff] [blame] | 1038 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1039 | |
| 1040 | if (!serial_isroot()) { |
| 1041 | if ((new_serial.baud_base != state->baud_base) || |
Jiri Slaby | 01bd730 | 2012-03-05 14:52:27 +0100 | [diff] [blame] | 1042 | (new_serial.close_delay != port->close_delay) || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1043 | (new_serial.xmit_fifo_size != state->xmit_fifo_size) || |
| 1044 | ((new_serial.flags & ~ASYNC_USR_MASK) != |
Julia Lawall | d3a7b83 | 2012-04-19 18:12:40 +0200 | [diff] [blame] | 1045 | (port->flags & ~ASYNC_USR_MASK))) { |
Alan Cox | 89c8d91 | 2012-08-08 16:30:13 +0100 | [diff] [blame] | 1046 | tty_unlock(tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1047 | return -EPERM; |
Julia Lawall | d3a7b83 | 2012-04-19 18:12:40 +0200 | [diff] [blame] | 1048 | } |
Jiri Slaby | 01bd730 | 2012-03-05 14:52:27 +0100 | [diff] [blame] | 1049 | port->flags = ((port->flags & ~ASYNC_USR_MASK) | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1050 | (new_serial.flags & ASYNC_USR_MASK)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1051 | state->custom_divisor = new_serial.custom_divisor; |
| 1052 | goto check_and_exit; |
| 1053 | } |
| 1054 | |
Alan Cox | e18ce49 | 2008-04-30 00:53:16 -0700 | [diff] [blame] | 1055 | if (new_serial.baud_base < 9600) { |
Alan Cox | 89c8d91 | 2012-08-08 16:30:13 +0100 | [diff] [blame] | 1056 | tty_unlock(tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1057 | return -EINVAL; |
Alan Cox | e18ce49 | 2008-04-30 00:53:16 -0700 | [diff] [blame] | 1058 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1059 | |
| 1060 | /* |
| 1061 | * OK, past this point, all the error checking has been done. |
| 1062 | * At this point, we start making changes..... |
| 1063 | */ |
| 1064 | |
| 1065 | state->baud_base = new_serial.baud_base; |
Jiri Slaby | 01bd730 | 2012-03-05 14:52:27 +0100 | [diff] [blame] | 1066 | port->flags = ((port->flags & ~ASYNC_FLAGS) | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1067 | (new_serial.flags & ASYNC_FLAGS)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1068 | state->custom_divisor = new_serial.custom_divisor; |
Jiri Slaby | 01bd730 | 2012-03-05 14:52:27 +0100 | [diff] [blame] | 1069 | port->close_delay = new_serial.close_delay * HZ/100; |
| 1070 | port->closing_wait = new_serial.closing_wait * HZ/100; |
Jiri Slaby | d6c53c0 | 2013-01-03 15:53:05 +0100 | [diff] [blame] | 1071 | port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1072 | |
| 1073 | check_and_exit: |
Peter Hurley | d41861c | 2016-04-09 17:53:25 -0700 | [diff] [blame] | 1074 | if (tty_port_initialized(port)) { |
Jiri Slaby | 0f9b968 | 2012-03-05 14:52:21 +0100 | [diff] [blame] | 1075 | if (change_spd) { |
Johan Hovold | 6086380 | 2017-06-06 12:54:37 +0200 | [diff] [blame] | 1076 | /* warn about deprecation unless clearing */ |
| 1077 | if (new_serial.flags & ASYNC_SPD_MASK) |
| 1078 | dev_warn_ratelimited(tty->dev, "use of SPD flags is deprecated\n"); |
Jiri Slaby | 588993d | 2012-03-05 14:52:22 +0100 | [diff] [blame] | 1079 | change_speed(tty, state, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1080 | } |
| 1081 | } else |
Jiri Slaby | 588993d | 2012-03-05 14:52:22 +0100 | [diff] [blame] | 1082 | retval = startup(tty, state); |
Alan Cox | 89c8d91 | 2012-08-08 16:30:13 +0100 | [diff] [blame] | 1083 | tty_unlock(tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1084 | return retval; |
| 1085 | } |
| 1086 | |
| 1087 | |
| 1088 | /* |
| 1089 | * get_lsr_info - get line status register info |
| 1090 | * |
| 1091 | * Purpose: Let user call ioctl() to get info when the UART physically |
| 1092 | * is emptied. On bus types like RS485, the transmitter must |
| 1093 | * release the bus after transmitting. This must be done when |
| 1094 | * the transmit shift register is empty, not be done when the |
| 1095 | * transmit holding register is empty. This functionality |
| 1096 | * allows an RS485 driver to be written in user space. |
| 1097 | */ |
Jiri Slaby | 916b765 | 2012-03-05 14:52:20 +0100 | [diff] [blame] | 1098 | static int get_lsr_info(struct serial_state *info, unsigned int __user *value) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1099 | { |
| 1100 | unsigned char status; |
| 1101 | unsigned int result; |
| 1102 | unsigned long flags; |
| 1103 | |
| 1104 | local_irq_save(flags); |
| 1105 | status = custom.serdatr; |
| 1106 | mb(); |
| 1107 | local_irq_restore(flags); |
| 1108 | result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0); |
| 1109 | if (copy_to_user(value, &result, sizeof(int))) |
| 1110 | return -EFAULT; |
| 1111 | return 0; |
| 1112 | } |
| 1113 | |
| 1114 | |
Alan Cox | 60b33c1 | 2011-02-14 16:26:14 +0000 | [diff] [blame] | 1115 | static int rs_tiocmget(struct tty_struct *tty) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1116 | { |
Jiri Slaby | 916b765 | 2012-03-05 14:52:20 +0100 | [diff] [blame] | 1117 | struct serial_state *info = tty->driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1118 | unsigned char control, status; |
| 1119 | unsigned long flags; |
| 1120 | |
| 1121 | if (serial_paranoia_check(info, tty->name, "rs_ioctl")) |
| 1122 | return -ENODEV; |
Peter Hurley | 18900ca | 2016-04-09 17:06:48 -0700 | [diff] [blame] | 1123 | if (tty_io_error(tty)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1124 | return -EIO; |
| 1125 | |
| 1126 | control = info->MCR; |
| 1127 | local_irq_save(flags); |
| 1128 | status = ciab.pra; |
| 1129 | local_irq_restore(flags); |
| 1130 | return ((control & SER_RTS) ? TIOCM_RTS : 0) |
| 1131 | | ((control & SER_DTR) ? TIOCM_DTR : 0) |
| 1132 | | (!(status & SER_DCD) ? TIOCM_CAR : 0) |
| 1133 | | (!(status & SER_DSR) ? TIOCM_DSR : 0) |
| 1134 | | (!(status & SER_CTS) ? TIOCM_CTS : 0); |
| 1135 | } |
| 1136 | |
Alan Cox | 20b9d17 | 2011-02-14 16:26:50 +0000 | [diff] [blame] | 1137 | static int rs_tiocmset(struct tty_struct *tty, unsigned int set, |
| 1138 | unsigned int clear) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1139 | { |
Jiri Slaby | 916b765 | 2012-03-05 14:52:20 +0100 | [diff] [blame] | 1140 | struct serial_state *info = tty->driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1141 | unsigned long flags; |
| 1142 | |
| 1143 | if (serial_paranoia_check(info, tty->name, "rs_ioctl")) |
| 1144 | return -ENODEV; |
Peter Hurley | 18900ca | 2016-04-09 17:06:48 -0700 | [diff] [blame] | 1145 | if (tty_io_error(tty)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1146 | return -EIO; |
| 1147 | |
| 1148 | local_irq_save(flags); |
| 1149 | if (set & TIOCM_RTS) |
| 1150 | info->MCR |= SER_RTS; |
| 1151 | if (set & TIOCM_DTR) |
| 1152 | info->MCR |= SER_DTR; |
| 1153 | if (clear & TIOCM_RTS) |
| 1154 | info->MCR &= ~SER_RTS; |
| 1155 | if (clear & TIOCM_DTR) |
| 1156 | info->MCR &= ~SER_DTR; |
| 1157 | rtsdtr_ctrl(info->MCR); |
| 1158 | local_irq_restore(flags); |
| 1159 | return 0; |
| 1160 | } |
| 1161 | |
| 1162 | /* |
| 1163 | * rs_break() --- routine which turns the break handling on or off |
| 1164 | */ |
Alan Cox | 9e98966 | 2008-07-22 11:18:03 +0100 | [diff] [blame] | 1165 | static int rs_break(struct tty_struct *tty, int break_state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1166 | { |
Jiri Slaby | 916b765 | 2012-03-05 14:52:20 +0100 | [diff] [blame] | 1167 | struct serial_state *info = tty->driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1168 | unsigned long flags; |
| 1169 | |
| 1170 | if (serial_paranoia_check(info, tty->name, "rs_break")) |
Geert Uytterhoeven | 970a8a5 | 2008-08-06 22:19:39 +0200 | [diff] [blame] | 1171 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1172 | |
| 1173 | local_irq_save(flags); |
| 1174 | if (break_state == -1) |
| 1175 | custom.adkcon = AC_SETCLR | AC_UARTBRK; |
| 1176 | else |
| 1177 | custom.adkcon = AC_UARTBRK; |
| 1178 | mb(); |
| 1179 | local_irq_restore(flags); |
Alan Cox | 9e98966 | 2008-07-22 11:18:03 +0100 | [diff] [blame] | 1180 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1181 | } |
| 1182 | |
Alan Cox | 0587102 | 2010-09-16 18:21:52 +0100 | [diff] [blame] | 1183 | /* |
| 1184 | * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) |
| 1185 | * Return: write counters to the user passed counter struct |
| 1186 | * NB: both 1->0 and 0->1 transitions are counted except for |
| 1187 | * RI where only 0->1 is counted. |
| 1188 | */ |
| 1189 | static int rs_get_icount(struct tty_struct *tty, |
| 1190 | struct serial_icounter_struct *icount) |
| 1191 | { |
Jiri Slaby | 916b765 | 2012-03-05 14:52:20 +0100 | [diff] [blame] | 1192 | struct serial_state *info = tty->driver_data; |
Alan Cox | 0587102 | 2010-09-16 18:21:52 +0100 | [diff] [blame] | 1193 | struct async_icount cnow; |
| 1194 | unsigned long flags; |
| 1195 | |
| 1196 | local_irq_save(flags); |
Jiri Slaby | 916b765 | 2012-03-05 14:52:20 +0100 | [diff] [blame] | 1197 | cnow = info->icount; |
Alan Cox | 0587102 | 2010-09-16 18:21:52 +0100 | [diff] [blame] | 1198 | local_irq_restore(flags); |
| 1199 | icount->cts = cnow.cts; |
| 1200 | icount->dsr = cnow.dsr; |
| 1201 | icount->rng = cnow.rng; |
| 1202 | icount->dcd = cnow.dcd; |
| 1203 | icount->rx = cnow.rx; |
| 1204 | icount->tx = cnow.tx; |
| 1205 | icount->frame = cnow.frame; |
| 1206 | icount->overrun = cnow.overrun; |
| 1207 | icount->parity = cnow.parity; |
| 1208 | icount->brk = cnow.brk; |
| 1209 | icount->buf_overrun = cnow.buf_overrun; |
| 1210 | |
| 1211 | return 0; |
| 1212 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1213 | |
Alan Cox | 6caa76b | 2011-02-14 16:27:22 +0000 | [diff] [blame] | 1214 | static int rs_ioctl(struct tty_struct *tty, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1215 | unsigned int cmd, unsigned long arg) |
| 1216 | { |
Jiri Slaby | 916b765 | 2012-03-05 14:52:20 +0100 | [diff] [blame] | 1217 | struct serial_state *info = tty->driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1218 | struct async_icount cprev, cnow; /* kernel counter temps */ |
Al Viro | ab14cae | 2006-01-12 01:06:30 -0800 | [diff] [blame] | 1219 | void __user *argp = (void __user *)arg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1220 | unsigned long flags; |
Arnd Bergmann | 591cee0 | 2014-01-02 13:07:38 +0100 | [diff] [blame] | 1221 | DEFINE_WAIT(wait); |
| 1222 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1223 | |
| 1224 | if (serial_paranoia_check(info, tty->name, "rs_ioctl")) |
| 1225 | return -ENODEV; |
| 1226 | |
| 1227 | if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) && |
| 1228 | (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) && |
| 1229 | (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) { |
Peter Hurley | 18900ca | 2016-04-09 17:06:48 -0700 | [diff] [blame] | 1230 | if (tty_io_error(tty)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1231 | return -EIO; |
| 1232 | } |
| 1233 | |
| 1234 | switch (cmd) { |
| 1235 | case TIOCGSERIAL: |
Jiri Slaby | ff169e5 | 2012-03-05 14:52:44 +0100 | [diff] [blame] | 1236 | return get_serial_info(tty, info, argp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1237 | case TIOCSSERIAL: |
Jiri Slaby | 588993d | 2012-03-05 14:52:22 +0100 | [diff] [blame] | 1238 | return set_serial_info(tty, info, argp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1239 | case TIOCSERCONFIG: |
| 1240 | return 0; |
| 1241 | |
| 1242 | case TIOCSERGETLSR: /* Get line status register */ |
Al Viro | ab14cae | 2006-01-12 01:06:30 -0800 | [diff] [blame] | 1243 | return get_lsr_info(info, argp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1244 | |
| 1245 | case TIOCSERGSTRUCT: |
Al Viro | ab14cae | 2006-01-12 01:06:30 -0800 | [diff] [blame] | 1246 | if (copy_to_user(argp, |
Jiri Slaby | 916b765 | 2012-03-05 14:52:20 +0100 | [diff] [blame] | 1247 | info, sizeof(struct serial_state))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1248 | return -EFAULT; |
| 1249 | return 0; |
| 1250 | |
| 1251 | /* |
| 1252 | * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change |
| 1253 | * - mask passed in arg for lines of interest |
| 1254 | * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) |
| 1255 | * Caller should use TIOCGICOUNT to see which one it was |
| 1256 | */ |
| 1257 | case TIOCMIWAIT: |
| 1258 | local_irq_save(flags); |
| 1259 | /* note the counters on entry */ |
Jiri Slaby | 916b765 | 2012-03-05 14:52:20 +0100 | [diff] [blame] | 1260 | cprev = info->icount; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1261 | local_irq_restore(flags); |
| 1262 | while (1) { |
Arnd Bergmann | 591cee0 | 2014-01-02 13:07:38 +0100 | [diff] [blame] | 1263 | prepare_to_wait(&info->tport.delta_msr_wait, |
| 1264 | &wait, TASK_INTERRUPTIBLE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1265 | local_irq_save(flags); |
Jiri Slaby | 916b765 | 2012-03-05 14:52:20 +0100 | [diff] [blame] | 1266 | cnow = info->icount; /* atomic copy */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1267 | local_irq_restore(flags); |
| 1268 | if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr && |
Arnd Bergmann | 591cee0 | 2014-01-02 13:07:38 +0100 | [diff] [blame] | 1269 | cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) { |
| 1270 | ret = -EIO; /* no change => error */ |
| 1271 | break; |
| 1272 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1273 | if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || |
| 1274 | ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || |
| 1275 | ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || |
| 1276 | ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) { |
Arnd Bergmann | 591cee0 | 2014-01-02 13:07:38 +0100 | [diff] [blame] | 1277 | ret = 0; |
| 1278 | break; |
| 1279 | } |
| 1280 | schedule(); |
| 1281 | /* see if a signal did it */ |
| 1282 | if (signal_pending(current)) { |
| 1283 | ret = -ERESTARTSYS; |
| 1284 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1285 | } |
| 1286 | cprev = cnow; |
| 1287 | } |
Arnd Bergmann | 591cee0 | 2014-01-02 13:07:38 +0100 | [diff] [blame] | 1288 | finish_wait(&info->tport.delta_msr_wait, &wait); |
| 1289 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1290 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1291 | case TIOCSERGWILD: |
| 1292 | case TIOCSERSWILD: |
| 1293 | /* "setserial -W" is called in Debian boot */ |
| 1294 | printk ("TIOCSER?WILD ioctl obsolete, ignored.\n"); |
| 1295 | return 0; |
| 1296 | |
| 1297 | default: |
| 1298 | return -ENOIOCTLCMD; |
| 1299 | } |
| 1300 | return 0; |
| 1301 | } |
| 1302 | |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 1303 | static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1304 | { |
Jiri Slaby | 916b765 | 2012-03-05 14:52:20 +0100 | [diff] [blame] | 1305 | struct serial_state *info = tty->driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1306 | unsigned long flags; |
Alan Cox | adc8d74 | 2012-07-14 15:31:47 +0100 | [diff] [blame] | 1307 | unsigned int cflag = tty->termios.c_cflag; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1308 | |
Jiri Slaby | 588993d | 2012-03-05 14:52:22 +0100 | [diff] [blame] | 1309 | change_speed(tty, info, old_termios); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1310 | |
| 1311 | /* Handle transition to B0 status */ |
Peter Hurley | 9db276f | 2016-01-10 20:36:15 -0800 | [diff] [blame] | 1312 | if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1313 | info->MCR &= ~(SER_DTR|SER_RTS); |
| 1314 | local_irq_save(flags); |
| 1315 | rtsdtr_ctrl(info->MCR); |
| 1316 | local_irq_restore(flags); |
| 1317 | } |
| 1318 | |
| 1319 | /* Handle transition away from B0 status */ |
Peter Hurley | 9db276f | 2016-01-10 20:36:15 -0800 | [diff] [blame] | 1320 | if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1321 | info->MCR |= SER_DTR; |
Peter Hurley | 97ef38b | 2016-04-09 17:11:36 -0700 | [diff] [blame] | 1322 | if (!C_CRTSCTS(tty) || !tty_throttled(tty)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1323 | info->MCR |= SER_RTS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1324 | local_irq_save(flags); |
| 1325 | rtsdtr_ctrl(info->MCR); |
| 1326 | local_irq_restore(flags); |
| 1327 | } |
| 1328 | |
| 1329 | /* Handle turning off CRTSCTS */ |
Peter Hurley | 9db276f | 2016-01-10 20:36:15 -0800 | [diff] [blame] | 1330 | if ((old_termios->c_cflag & CRTSCTS) && !C_CRTSCTS(tty)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1331 | tty->hw_stopped = 0; |
| 1332 | rs_start(tty); |
| 1333 | } |
| 1334 | |
| 1335 | #if 0 |
| 1336 | /* |
| 1337 | * No need to wake up processes in open wait, since they |
| 1338 | * sample the CLOCAL flag once, and don't recheck it. |
| 1339 | * XXX It's not clear whether the current behavior is correct |
| 1340 | * or not. Hence, this may change..... |
| 1341 | */ |
Peter Hurley | 9db276f | 2016-01-10 20:36:15 -0800 | [diff] [blame] | 1342 | if (!(old_termios->c_cflag & CLOCAL) && C_CLOCAL(tty)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1343 | wake_up_interruptible(&info->open_wait); |
| 1344 | #endif |
| 1345 | } |
| 1346 | |
| 1347 | /* |
| 1348 | * ------------------------------------------------------------ |
| 1349 | * rs_close() |
| 1350 | * |
| 1351 | * This routine is called when the serial port gets closed. First, we |
| 1352 | * wait for the last remaining data to be sent. Then, we unlink its |
| 1353 | * async structure from the interrupt chain if necessary, and we free |
| 1354 | * that IRQ if nothing is left in the chain. |
| 1355 | * ------------------------------------------------------------ |
| 1356 | */ |
| 1357 | static void rs_close(struct tty_struct *tty, struct file * filp) |
| 1358 | { |
Jiri Slaby | 916b765 | 2012-03-05 14:52:20 +0100 | [diff] [blame] | 1359 | struct serial_state *state = tty->driver_data; |
Jiri Slaby | 7188dc2 | 2012-03-05 14:52:43 +0100 | [diff] [blame] | 1360 | struct tty_port *port = &state->tport; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1361 | |
Jiri Slaby | 9b93742 | 2012-03-05 14:52:49 +0100 | [diff] [blame] | 1362 | if (serial_paranoia_check(state, tty->name, "rs_close")) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1363 | return; |
| 1364 | |
Jiri Slaby | 9b93742 | 2012-03-05 14:52:49 +0100 | [diff] [blame] | 1365 | if (tty_port_close_start(port, tty, filp) == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1366 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1367 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1368 | /* |
| 1369 | * At this point we stop accepting input. To do this, we |
| 1370 | * disable the receive line status interrupts, and tell the |
| 1371 | * interrupt driver to stop checking the data ready bit in the |
| 1372 | * line status register. |
| 1373 | */ |
Jiri Slaby | 916b765 | 2012-03-05 14:52:20 +0100 | [diff] [blame] | 1374 | state->read_status_mask &= ~UART_LSR_DR; |
Peter Hurley | d41861c | 2016-04-09 17:53:25 -0700 | [diff] [blame] | 1375 | if (tty_port_initialized(port)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1376 | /* disable receive interrupts */ |
| 1377 | custom.intena = IF_RBF; |
| 1378 | mb(); |
| 1379 | /* clear any pending receive interrupt */ |
| 1380 | custom.intreq = IF_RBF; |
| 1381 | mb(); |
| 1382 | |
| 1383 | /* |
| 1384 | * Before we drop DTR, make sure the UART transmitter |
| 1385 | * has completely drained; this is especially |
| 1386 | * important if there is a transmit FIFO! |
| 1387 | */ |
Jiri Slaby | 916b765 | 2012-03-05 14:52:20 +0100 | [diff] [blame] | 1388 | rs_wait_until_sent(tty, state->timeout); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1389 | } |
Jiri Slaby | 588993d | 2012-03-05 14:52:22 +0100 | [diff] [blame] | 1390 | shutdown(tty, state); |
Alan Cox | 978e595 | 2008-04-30 00:53:59 -0700 | [diff] [blame] | 1391 | rs_flush_buffer(tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1392 | |
| 1393 | tty_ldisc_flush(tty); |
Jiri Slaby | 7188dc2 | 2012-03-05 14:52:43 +0100 | [diff] [blame] | 1394 | port->tty = NULL; |
Jiri Slaby | b8edebe | 2012-03-05 14:52:48 +0100 | [diff] [blame] | 1395 | |
| 1396 | tty_port_close_end(port, tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1397 | } |
| 1398 | |
| 1399 | /* |
| 1400 | * rs_wait_until_sent() --- wait until the transmitter is empty |
| 1401 | */ |
| 1402 | static void rs_wait_until_sent(struct tty_struct *tty, int timeout) |
| 1403 | { |
Jiri Slaby | 916b765 | 2012-03-05 14:52:20 +0100 | [diff] [blame] | 1404 | struct serial_state *info = tty->driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1405 | unsigned long orig_jiffies, char_time; |
| 1406 | int lsr; |
| 1407 | |
| 1408 | if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent")) |
| 1409 | return; |
| 1410 | |
Jiri Slaby | 916b765 | 2012-03-05 14:52:20 +0100 | [diff] [blame] | 1411 | if (info->xmit_fifo_size == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1412 | return; /* Just in case.... */ |
| 1413 | |
| 1414 | orig_jiffies = jiffies; |
Alan Cox | 978e595 | 2008-04-30 00:53:59 -0700 | [diff] [blame] | 1415 | |
Arnd Bergmann | 2036521 | 2010-06-01 22:53:07 +0200 | [diff] [blame] | 1416 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1417 | * Set the check interval to be 1/5 of the estimated time to |
| 1418 | * send a single character, and make it at least 1. The check |
| 1419 | * interval should also be less than the timeout. |
| 1420 | * |
| 1421 | * Note: we have to use pretty tight timings here to satisfy |
| 1422 | * the NIST-PCTS. |
| 1423 | */ |
Jiri Slaby | 916b765 | 2012-03-05 14:52:20 +0100 | [diff] [blame] | 1424 | char_time = (info->timeout - HZ/50) / info->xmit_fifo_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1425 | char_time = char_time / 5; |
| 1426 | if (char_time == 0) |
| 1427 | char_time = 1; |
| 1428 | if (timeout) |
| 1429 | char_time = min_t(unsigned long, char_time, timeout); |
| 1430 | /* |
| 1431 | * If the transmitter hasn't cleared in twice the approximate |
| 1432 | * amount of time to send the entire FIFO, it probably won't |
| 1433 | * ever clear. This assumes the UART isn't doing flow |
| 1434 | * control, which is currently the case. Hence, if it ever |
| 1435 | * takes longer than info->timeout, this is probably due to a |
| 1436 | * UART bug of some kind. So, we clamp the timeout parameter at |
| 1437 | * 2*info->timeout. |
| 1438 | */ |
| 1439 | if (!timeout || timeout > 2*info->timeout) |
| 1440 | timeout = 2*info->timeout; |
| 1441 | #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT |
| 1442 | printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time); |
| 1443 | printk("jiff=%lu...", jiffies); |
| 1444 | #endif |
| 1445 | while(!((lsr = custom.serdatr) & SDR_TSRE)) { |
| 1446 | #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT |
| 1447 | printk("serdatr = %d (jiff=%lu)...", lsr, jiffies); |
| 1448 | #endif |
| 1449 | msleep_interruptible(jiffies_to_msecs(char_time)); |
| 1450 | if (signal_pending(current)) |
| 1451 | break; |
| 1452 | if (timeout && time_after(jiffies, orig_jiffies + timeout)) |
| 1453 | break; |
| 1454 | } |
Milind Arun Choudhary | cc0a8fb | 2007-05-08 00:30:52 -0700 | [diff] [blame] | 1455 | __set_current_state(TASK_RUNNING); |
Jiri Slaby | eff4b0b | 2011-07-14 14:35:13 +0200 | [diff] [blame] | 1456 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1457 | #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT |
| 1458 | printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies); |
| 1459 | #endif |
| 1460 | } |
| 1461 | |
| 1462 | /* |
| 1463 | * rs_hangup() --- called by tty_hangup() when a hangup is signaled. |
| 1464 | */ |
| 1465 | static void rs_hangup(struct tty_struct *tty) |
| 1466 | { |
Jiri Slaby | 916b765 | 2012-03-05 14:52:20 +0100 | [diff] [blame] | 1467 | struct serial_state *info = tty->driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1468 | |
| 1469 | if (serial_paranoia_check(info, tty->name, "rs_hangup")) |
| 1470 | return; |
| 1471 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1472 | rs_flush_buffer(tty); |
Jiri Slaby | 588993d | 2012-03-05 14:52:22 +0100 | [diff] [blame] | 1473 | shutdown(tty, info); |
Jiri Slaby | 12c8035 | 2012-03-05 14:52:26 +0100 | [diff] [blame] | 1474 | info->tport.count = 0; |
Peter Hurley | 807c8d81 | 2016-04-09 17:53:22 -0700 | [diff] [blame] | 1475 | tty_port_set_active(&info->tport, 0); |
Jiri Slaby | 8775879 | 2012-03-05 14:52:24 +0100 | [diff] [blame] | 1476 | info->tport.tty = NULL; |
| 1477 | wake_up_interruptible(&info->tport.open_wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1478 | } |
| 1479 | |
| 1480 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1481 | * This routine is called whenever a serial port is opened. It |
| 1482 | * enables interrupts for a serial port, linking in its async structure into |
| 1483 | * the IRQ chain. It also performs the serial-specific |
| 1484 | * initialization for the tty structure. |
| 1485 | */ |
| 1486 | static int rs_open(struct tty_struct *tty, struct file * filp) |
| 1487 | { |
Jiri Slaby | 916b765 | 2012-03-05 14:52:20 +0100 | [diff] [blame] | 1488 | struct serial_state *info = rs_table + tty->index; |
Jiri Slaby | 7188dc2 | 2012-03-05 14:52:43 +0100 | [diff] [blame] | 1489 | struct tty_port *port = &info->tport; |
Jiri Slaby | 410235f | 2012-03-05 14:52:01 +0100 | [diff] [blame] | 1490 | int retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1491 | |
Jiri Slaby | 7188dc2 | 2012-03-05 14:52:43 +0100 | [diff] [blame] | 1492 | port->count++; |
| 1493 | port->tty = tty; |
Jiri Slaby | 916b765 | 2012-03-05 14:52:20 +0100 | [diff] [blame] | 1494 | tty->driver_data = info; |
Jiri Slaby | 7188dc2 | 2012-03-05 14:52:43 +0100 | [diff] [blame] | 1495 | tty->port = port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1496 | if (serial_paranoia_check(info, tty->name, "rs_open")) |
| 1497 | return -ENODEV; |
| 1498 | |
Jiri Slaby | d6c53c0 | 2013-01-03 15:53:05 +0100 | [diff] [blame] | 1499 | port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1500 | |
Jiri Slaby | 588993d | 2012-03-05 14:52:22 +0100 | [diff] [blame] | 1501 | retval = startup(tty, info); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1502 | if (retval) { |
| 1503 | return retval; |
| 1504 | } |
| 1505 | |
Jiri Slaby | 6e1aeb0 | 2012-03-05 14:52:47 +0100 | [diff] [blame] | 1506 | return tty_port_block_til_ready(port, tty, filp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1507 | } |
| 1508 | |
| 1509 | /* |
| 1510 | * /proc fs routines.... |
| 1511 | */ |
| 1512 | |
Jiri Slaby | ff169e5 | 2012-03-05 14:52:44 +0100 | [diff] [blame] | 1513 | static inline void line_info(struct seq_file *m, int line, |
| 1514 | struct serial_state *state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1515 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1516 | char stat_buf[30], control, status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1517 | unsigned long flags; |
| 1518 | |
Jiri Slaby | ff169e5 | 2012-03-05 14:52:44 +0100 | [diff] [blame] | 1519 | seq_printf(m, "%d: uart:amiga_builtin", line); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1520 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1521 | local_irq_save(flags); |
| 1522 | status = ciab.pra; |
Peter Hurley | d41861c | 2016-04-09 17:53:25 -0700 | [diff] [blame] | 1523 | control = tty_port_initialized(&state->tport) ? state->MCR : status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1524 | local_irq_restore(flags); |
| 1525 | |
| 1526 | stat_buf[0] = 0; |
| 1527 | stat_buf[1] = 0; |
| 1528 | if(!(control & SER_RTS)) |
| 1529 | strcat(stat_buf, "|RTS"); |
| 1530 | if(!(status & SER_CTS)) |
| 1531 | strcat(stat_buf, "|CTS"); |
| 1532 | if(!(control & SER_DTR)) |
| 1533 | strcat(stat_buf, "|DTR"); |
| 1534 | if(!(status & SER_DSR)) |
| 1535 | strcat(stat_buf, "|DSR"); |
| 1536 | if(!(status & SER_DCD)) |
| 1537 | strcat(stat_buf, "|CD"); |
| 1538 | |
Jiri Slaby | 916b765 | 2012-03-05 14:52:20 +0100 | [diff] [blame] | 1539 | if (state->quot) |
| 1540 | seq_printf(m, " baud:%d", state->baud_base / state->quot); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1541 | |
Alexey Dobriyan | d594027 | 2009-03-31 15:19:23 -0700 | [diff] [blame] | 1542 | seq_printf(m, " tx:%d rx:%d", state->icount.tx, state->icount.rx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1543 | |
| 1544 | if (state->icount.frame) |
Alexey Dobriyan | d594027 | 2009-03-31 15:19:23 -0700 | [diff] [blame] | 1545 | seq_printf(m, " fe:%d", state->icount.frame); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1546 | |
| 1547 | if (state->icount.parity) |
Alexey Dobriyan | d594027 | 2009-03-31 15:19:23 -0700 | [diff] [blame] | 1548 | seq_printf(m, " pe:%d", state->icount.parity); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1549 | |
| 1550 | if (state->icount.brk) |
Alexey Dobriyan | d594027 | 2009-03-31 15:19:23 -0700 | [diff] [blame] | 1551 | seq_printf(m, " brk:%d", state->icount.brk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1552 | |
| 1553 | if (state->icount.overrun) |
Alexey Dobriyan | d594027 | 2009-03-31 15:19:23 -0700 | [diff] [blame] | 1554 | seq_printf(m, " oe:%d", state->icount.overrun); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1555 | |
| 1556 | /* |
| 1557 | * Last thing is the RS-232 status lines |
| 1558 | */ |
Alexey Dobriyan | d594027 | 2009-03-31 15:19:23 -0700 | [diff] [blame] | 1559 | seq_printf(m, " %s\n", stat_buf+1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1560 | } |
| 1561 | |
Alexey Dobriyan | d594027 | 2009-03-31 15:19:23 -0700 | [diff] [blame] | 1562 | static int rs_proc_show(struct seq_file *m, void *v) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1563 | { |
Alexey Dobriyan | d594027 | 2009-03-31 15:19:23 -0700 | [diff] [blame] | 1564 | seq_printf(m, "serinfo:1.0 driver:%s\n", serial_version); |
Jiri Slaby | ff169e5 | 2012-03-05 14:52:44 +0100 | [diff] [blame] | 1565 | line_info(m, 0, &rs_table[0]); |
Alexey Dobriyan | d594027 | 2009-03-31 15:19:23 -0700 | [diff] [blame] | 1566 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1567 | } |
| 1568 | |
Alexey Dobriyan | d594027 | 2009-03-31 15:19:23 -0700 | [diff] [blame] | 1569 | static int rs_proc_open(struct inode *inode, struct file *file) |
| 1570 | { |
| 1571 | return single_open(file, rs_proc_show, NULL); |
| 1572 | } |
| 1573 | |
| 1574 | static const struct file_operations rs_proc_fops = { |
| 1575 | .owner = THIS_MODULE, |
| 1576 | .open = rs_proc_open, |
| 1577 | .read = seq_read, |
| 1578 | .llseek = seq_lseek, |
| 1579 | .release = single_release, |
| 1580 | }; |
| 1581 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1582 | /* |
| 1583 | * --------------------------------------------------------------------- |
| 1584 | * rs_init() and friends |
| 1585 | * |
| 1586 | * rs_init() is called at boot-time to initialize the serial driver. |
| 1587 | * --------------------------------------------------------------------- |
| 1588 | */ |
| 1589 | |
| 1590 | /* |
| 1591 | * This routine prints out the appropriate serial driver version |
| 1592 | * number, and identifies which options were configured into this |
| 1593 | * driver. |
| 1594 | */ |
Adrian Bunk | 41c28ff | 2006-03-23 03:00:56 -0800 | [diff] [blame] | 1595 | static void show_serial_version(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1596 | { |
| 1597 | printk(KERN_INFO "%s version %s\n", serial_name, serial_version); |
| 1598 | } |
| 1599 | |
| 1600 | |
Jeff Dike | b68e31d | 2006-10-02 02:17:18 -0700 | [diff] [blame] | 1601 | static const struct tty_operations serial_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1602 | .open = rs_open, |
| 1603 | .close = rs_close, |
| 1604 | .write = rs_write, |
| 1605 | .put_char = rs_put_char, |
| 1606 | .flush_chars = rs_flush_chars, |
| 1607 | .write_room = rs_write_room, |
| 1608 | .chars_in_buffer = rs_chars_in_buffer, |
| 1609 | .flush_buffer = rs_flush_buffer, |
| 1610 | .ioctl = rs_ioctl, |
| 1611 | .throttle = rs_throttle, |
| 1612 | .unthrottle = rs_unthrottle, |
| 1613 | .set_termios = rs_set_termios, |
| 1614 | .stop = rs_stop, |
| 1615 | .start = rs_start, |
| 1616 | .hangup = rs_hangup, |
| 1617 | .break_ctl = rs_break, |
| 1618 | .send_xchar = rs_send_xchar, |
| 1619 | .wait_until_sent = rs_wait_until_sent, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1620 | .tiocmget = rs_tiocmget, |
| 1621 | .tiocmset = rs_tiocmset, |
Alan Cox | 0587102 | 2010-09-16 18:21:52 +0100 | [diff] [blame] | 1622 | .get_icount = rs_get_icount, |
Alexey Dobriyan | d594027 | 2009-03-31 15:19:23 -0700 | [diff] [blame] | 1623 | .proc_fops = &rs_proc_fops, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1624 | }; |
| 1625 | |
Jiri Slaby | f1166604 | 2012-03-05 14:52:46 +0100 | [diff] [blame] | 1626 | static int amiga_carrier_raised(struct tty_port *port) |
| 1627 | { |
| 1628 | return !(ciab.pra & SER_DCD); |
| 1629 | } |
| 1630 | |
| 1631 | static void amiga_dtr_rts(struct tty_port *port, int raise) |
| 1632 | { |
| 1633 | struct serial_state *info = container_of(port, struct serial_state, |
| 1634 | tport); |
| 1635 | unsigned long flags; |
| 1636 | |
| 1637 | if (raise) |
| 1638 | info->MCR |= SER_DTR|SER_RTS; |
| 1639 | else |
| 1640 | info->MCR &= ~(SER_DTR|SER_RTS); |
| 1641 | |
| 1642 | local_irq_save(flags); |
| 1643 | rtsdtr_ctrl(info->MCR); |
| 1644 | local_irq_restore(flags); |
| 1645 | } |
| 1646 | |
| 1647 | static const struct tty_port_operations amiga_port_ops = { |
| 1648 | .carrier_raised = amiga_carrier_raised, |
| 1649 | .dtr_rts = amiga_dtr_rts, |
| 1650 | }; |
| 1651 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1652 | /* |
| 1653 | * The serial driver boot-time initialization code! |
| 1654 | */ |
Geert Uytterhoeven | 826e8c8 | 2009-04-05 13:12:30 +0200 | [diff] [blame] | 1655 | static int __init amiga_serial_probe(struct platform_device *pdev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1656 | { |
| 1657 | unsigned long flags; |
| 1658 | struct serial_state * state; |
Geert Uytterhoeven | 5edc304 | 2008-12-30 14:13:41 +0100 | [diff] [blame] | 1659 | int error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1660 | |
Jiri Slaby | 410235f | 2012-03-05 14:52:01 +0100 | [diff] [blame] | 1661 | serial_driver = alloc_tty_driver(NR_PORTS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1662 | if (!serial_driver) |
| 1663 | return -ENOMEM; |
| 1664 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1665 | show_serial_version(); |
| 1666 | |
| 1667 | /* Initialize the tty_driver structure */ |
| 1668 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1669 | serial_driver->driver_name = "amiserial"; |
| 1670 | serial_driver->name = "ttyS"; |
| 1671 | serial_driver->major = TTY_MAJOR; |
| 1672 | serial_driver->minor_start = 64; |
| 1673 | serial_driver->type = TTY_DRIVER_TYPE_SERIAL; |
| 1674 | serial_driver->subtype = SERIAL_TYPE_NORMAL; |
| 1675 | serial_driver->init_termios = tty_std_termios; |
| 1676 | serial_driver->init_termios.c_cflag = |
| 1677 | B9600 | CS8 | CREAD | HUPCL | CLOCAL; |
| 1678 | serial_driver->flags = TTY_DRIVER_REAL_RAW; |
| 1679 | tty_set_operations(serial_driver, &serial_ops); |
| 1680 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1681 | state = rs_table; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1682 | state->port = (int)&custom.serdatr; /* Just to give it a value */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1683 | state->custom_divisor = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1684 | state->icount.cts = state->icount.dsr = |
| 1685 | state->icount.rng = state->icount.dcd = 0; |
| 1686 | state->icount.rx = state->icount.tx = 0; |
| 1687 | state->icount.frame = state->icount.parity = 0; |
| 1688 | state->icount.overrun = state->icount.brk = 0; |
Jiri Slaby | 8775879 | 2012-03-05 14:52:24 +0100 | [diff] [blame] | 1689 | tty_port_init(&state->tport); |
Jiri Slaby | f1166604 | 2012-03-05 14:52:46 +0100 | [diff] [blame] | 1690 | state->tport.ops = &amiga_port_ops; |
Jiri Slaby | b19e2ca | 2012-08-07 21:47:51 +0200 | [diff] [blame] | 1691 | tty_port_link_device(&state->tport, serial_driver, 0); |
| 1692 | |
| 1693 | error = tty_register_driver(serial_driver); |
| 1694 | if (error) |
| 1695 | goto fail_put_tty_driver; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1696 | |
Jiri Slaby | ff169e5 | 2012-03-05 14:52:44 +0100 | [diff] [blame] | 1697 | printk(KERN_INFO "ttyS0 is the amiga builtin serial port\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1698 | |
| 1699 | /* Hardware set up */ |
| 1700 | |
| 1701 | state->baud_base = amiga_colorclock; |
| 1702 | state->xmit_fifo_size = 1; |
| 1703 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1704 | /* set ISRs, and then disable the rx interrupts */ |
Geert Uytterhoeven | 5edc304 | 2008-12-30 14:13:41 +0100 | [diff] [blame] | 1705 | error = request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state); |
| 1706 | if (error) |
| 1707 | goto fail_unregister; |
| 1708 | |
Yong Zhang | 9cfb5c0 | 2011-09-22 16:59:15 +0800 | [diff] [blame] | 1709 | error = request_irq(IRQ_AMIGA_RBF, ser_rx_int, 0, |
Geert Uytterhoeven | 5edc304 | 2008-12-30 14:13:41 +0100 | [diff] [blame] | 1710 | "serial RX", state); |
| 1711 | if (error) |
| 1712 | goto fail_free_irq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1713 | |
Julia Lawall | c70c036 | 2010-04-06 14:34:46 -0700 | [diff] [blame] | 1714 | local_irq_save(flags); |
| 1715 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1716 | /* turn off Rx and Tx interrupts */ |
| 1717 | custom.intena = IF_RBF | IF_TBE; |
| 1718 | mb(); |
| 1719 | |
| 1720 | /* clear any pending interrupt */ |
| 1721 | custom.intreq = IF_RBF | IF_TBE; |
| 1722 | mb(); |
| 1723 | |
| 1724 | local_irq_restore(flags); |
| 1725 | |
| 1726 | /* |
| 1727 | * set the appropriate directions for the modem control flags, |
| 1728 | * and clear RTS and DTR |
| 1729 | */ |
| 1730 | ciab.ddra |= (SER_DTR | SER_RTS); /* outputs */ |
| 1731 | ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR); /* inputs */ |
| 1732 | |
Geert Uytterhoeven | 826e8c8 | 2009-04-05 13:12:30 +0200 | [diff] [blame] | 1733 | platform_set_drvdata(pdev, state); |
| 1734 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1735 | return 0; |
Geert Uytterhoeven | 5edc304 | 2008-12-30 14:13:41 +0100 | [diff] [blame] | 1736 | |
| 1737 | fail_free_irq: |
| 1738 | free_irq(IRQ_AMIGA_TBE, state); |
| 1739 | fail_unregister: |
| 1740 | tty_unregister_driver(serial_driver); |
Geert Uytterhoeven | 5edc304 | 2008-12-30 14:13:41 +0100 | [diff] [blame] | 1741 | fail_put_tty_driver: |
Jiri Slaby | 191c5f1 | 2012-11-15 09:49:56 +0100 | [diff] [blame] | 1742 | tty_port_destroy(&state->tport); |
Geert Uytterhoeven | 5edc304 | 2008-12-30 14:13:41 +0100 | [diff] [blame] | 1743 | put_tty_driver(serial_driver); |
| 1744 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1745 | } |
| 1746 | |
Geert Uytterhoeven | 826e8c8 | 2009-04-05 13:12:30 +0200 | [diff] [blame] | 1747 | static int __exit amiga_serial_remove(struct platform_device *pdev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1748 | { |
| 1749 | int error; |
Geert Uytterhoeven | 826e8c8 | 2009-04-05 13:12:30 +0200 | [diff] [blame] | 1750 | struct serial_state *state = platform_get_drvdata(pdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1751 | |
| 1752 | /* printk("Unloading %s: version %s\n", serial_name, serial_version); */ |
Greg Kroah-Hartman | 2eeaf0b | 2015-04-30 11:22:05 +0200 | [diff] [blame] | 1753 | error = tty_unregister_driver(serial_driver); |
| 1754 | if (error) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1755 | printk("SERIAL: failed to unregister serial driver (%d)\n", |
| 1756 | error); |
| 1757 | put_tty_driver(serial_driver); |
Jiri Slaby | 191c5f1 | 2012-11-15 09:49:56 +0100 | [diff] [blame] | 1758 | tty_port_destroy(&state->tport); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1759 | |
Jiri Slaby | 916b765 | 2012-03-05 14:52:20 +0100 | [diff] [blame] | 1760 | free_irq(IRQ_AMIGA_TBE, state); |
| 1761 | free_irq(IRQ_AMIGA_RBF, state); |
Geert Uytterhoeven | 5edc304 | 2008-12-30 14:13:41 +0100 | [diff] [blame] | 1762 | |
Geert Uytterhoeven | 826e8c8 | 2009-04-05 13:12:30 +0200 | [diff] [blame] | 1763 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1764 | } |
| 1765 | |
Geert Uytterhoeven | 826e8c8 | 2009-04-05 13:12:30 +0200 | [diff] [blame] | 1766 | static struct platform_driver amiga_serial_driver = { |
| 1767 | .remove = __exit_p(amiga_serial_remove), |
| 1768 | .driver = { |
| 1769 | .name = "amiga-serial", |
Geert Uytterhoeven | 826e8c8 | 2009-04-05 13:12:30 +0200 | [diff] [blame] | 1770 | }, |
| 1771 | }; |
| 1772 | |
Jingoo Han | fec6bee | 2013-03-05 12:29:20 +0900 | [diff] [blame] | 1773 | module_platform_driver_probe(amiga_serial_driver, amiga_serial_probe); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1774 | |
| 1775 | |
Geert Uytterhoeven | d1a35e4 | 2008-10-26 19:51:14 +0100 | [diff] [blame] | 1776 | #if defined(CONFIG_SERIAL_CONSOLE) && !defined(MODULE) |
| 1777 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1778 | /* |
| 1779 | * ------------------------------------------------------------ |
| 1780 | * Serial console driver |
| 1781 | * ------------------------------------------------------------ |
| 1782 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1783 | |
| 1784 | static void amiga_serial_putc(char c) |
| 1785 | { |
| 1786 | custom.serdat = (unsigned char)c | 0x100; |
| 1787 | while (!(custom.serdatr & 0x2000)) |
| 1788 | barrier(); |
| 1789 | } |
| 1790 | |
| 1791 | /* |
| 1792 | * Print a string to the serial port trying not to disturb |
| 1793 | * any possible real use of the port... |
| 1794 | * |
| 1795 | * The console must be locked when we get here. |
| 1796 | */ |
| 1797 | static void serial_console_write(struct console *co, const char *s, |
| 1798 | unsigned count) |
| 1799 | { |
| 1800 | unsigned short intena = custom.intenar; |
| 1801 | |
| 1802 | custom.intena = IF_TBE; |
| 1803 | |
| 1804 | while (count--) { |
| 1805 | if (*s == '\n') |
| 1806 | amiga_serial_putc('\r'); |
| 1807 | amiga_serial_putc(*s++); |
| 1808 | } |
| 1809 | |
| 1810 | custom.intena = IF_SETCLR | (intena & IF_TBE); |
| 1811 | } |
| 1812 | |
| 1813 | static struct tty_driver *serial_console_device(struct console *c, int *index) |
| 1814 | { |
| 1815 | *index = 0; |
| 1816 | return serial_driver; |
| 1817 | } |
| 1818 | |
| 1819 | static struct console sercons = { |
| 1820 | .name = "ttyS", |
| 1821 | .write = serial_console_write, |
| 1822 | .device = serial_console_device, |
| 1823 | .flags = CON_PRINTBUFFER, |
| 1824 | .index = -1, |
| 1825 | }; |
| 1826 | |
| 1827 | /* |
| 1828 | * Register console. |
| 1829 | */ |
| 1830 | static int __init amiserial_console_init(void) |
| 1831 | { |
Geert Uytterhoeven | 3dcf344 | 2013-11-22 16:47:27 +0100 | [diff] [blame] | 1832 | if (!MACH_IS_AMIGA) |
| 1833 | return -ENODEV; |
| 1834 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1835 | register_console(&sercons); |
| 1836 | return 0; |
| 1837 | } |
| 1838 | console_initcall(amiserial_console_init); |
Geert Uytterhoeven | d1a35e4 | 2008-10-26 19:51:14 +0100 | [diff] [blame] | 1839 | |
| 1840 | #endif /* CONFIG_SERIAL_CONSOLE && !MODULE */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1841 | |
| 1842 | MODULE_LICENSE("GPL"); |
Geert Uytterhoeven | 826e8c8 | 2009-04-05 13:12:30 +0200 | [diff] [blame] | 1843 | MODULE_ALIAS("platform:amiga-serial"); |