Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* IEEE-1284 operations for parport. |
| 2 | * |
| 3 | * This file is for generic IEEE 1284 operations. The idea is that |
| 4 | * they are used by the low-level drivers. If they have a special way |
| 5 | * of doing something, they can provide their own routines (and put |
| 6 | * the function pointers in port->ops); if not, they can just use these |
| 7 | * as a fallback. |
| 8 | * |
| 9 | * Note: Make no assumptions about hardware or architecture in this file! |
| 10 | * |
| 11 | * Author: Tim Waugh <tim@cyberelk.demon.co.uk> |
| 12 | * Fixed AUTOFD polarity in ecp_forward_to_reverse(). Fred Barnes, 1999 |
| 13 | * Software emulated EPP fixes, Fred Barnes, 04/2001. |
| 14 | */ |
| 15 | |
| 16 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <linux/module.h> |
| 18 | #include <linux/parport.h> |
| 19 | #include <linux/delay.h> |
Ingo Molnar | 174cd4b | 2017-02-02 19:15:33 +0100 | [diff] [blame] | 20 | #include <linux/sched/signal.h> |
Linus Torvalds | 7c0f6ba | 2016-12-24 11:46:01 -0800 | [diff] [blame] | 21 | #include <linux/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | |
| 23 | #undef DEBUG /* undef me for production */ |
| 24 | |
| 25 | #ifdef CONFIG_LP_CONSOLE |
| 26 | #undef DEBUG /* Don't want a garbled console */ |
| 27 | #endif |
| 28 | |
| 29 | #ifdef DEBUG |
| 30 | #define DPRINTK(stuff...) printk (stuff) |
| 31 | #else |
| 32 | #define DPRINTK(stuff...) |
| 33 | #endif |
| 34 | |
| 35 | /*** * |
| 36 | * One-way data transfer functions. * |
| 37 | * ***/ |
| 38 | |
| 39 | /* Compatibility mode. */ |
| 40 | size_t parport_ieee1284_write_compat (struct parport *port, |
| 41 | const void *buffer, size_t len, |
| 42 | int flags) |
| 43 | { |
| 44 | int no_irq = 1; |
| 45 | ssize_t count = 0; |
| 46 | const unsigned char *addr = buffer; |
| 47 | unsigned char byte; |
| 48 | struct pardevice *dev = port->physport->cad; |
| 49 | unsigned char ctl = (PARPORT_CONTROL_SELECT |
| 50 | | PARPORT_CONTROL_INIT); |
| 51 | |
| 52 | if (port->irq != PARPORT_IRQ_NONE) { |
| 53 | parport_enable_irq (port); |
| 54 | no_irq = 0; |
| 55 | } |
| 56 | |
| 57 | port->physport->ieee1284.phase = IEEE1284_PH_FWD_DATA; |
| 58 | parport_write_control (port, ctl); |
| 59 | parport_data_forward (port); |
| 60 | while (count < len) { |
| 61 | unsigned long expire = jiffies + dev->timeout; |
Nishanth Aravamudan | 7b4ccf8 | 2005-09-10 00:27:31 -0700 | [diff] [blame] | 62 | long wait = msecs_to_jiffies(10); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | unsigned char mask = (PARPORT_STATUS_ERROR |
| 64 | | PARPORT_STATUS_BUSY); |
| 65 | unsigned char val = (PARPORT_STATUS_ERROR |
| 66 | | PARPORT_STATUS_BUSY); |
| 67 | |
| 68 | /* Wait until the peripheral's ready */ |
| 69 | do { |
| 70 | /* Is the peripheral ready yet? */ |
| 71 | if (!parport_wait_peripheral (port, mask, val)) |
| 72 | /* Skip the loop */ |
| 73 | goto ready; |
| 74 | |
| 75 | /* Is the peripheral upset? */ |
| 76 | if ((parport_read_status (port) & |
| 77 | (PARPORT_STATUS_PAPEROUT | |
| 78 | PARPORT_STATUS_SELECT | |
| 79 | PARPORT_STATUS_ERROR)) |
| 80 | != (PARPORT_STATUS_SELECT | |
| 81 | PARPORT_STATUS_ERROR)) |
| 82 | /* If nFault is asserted (i.e. no |
| 83 | * error) and PAPEROUT and SELECT are |
| 84 | * just red herrings, give the driver |
| 85 | * a chance to check it's happy with |
| 86 | * that before continuing. */ |
| 87 | goto stop; |
| 88 | |
| 89 | /* Have we run out of time? */ |
| 90 | if (!time_before (jiffies, expire)) |
| 91 | break; |
| 92 | |
| 93 | /* Yield the port for a while. If this is the |
| 94 | first time around the loop, don't let go of |
| 95 | the port. This way, we find out if we have |
| 96 | our interrupt handler called. */ |
| 97 | if (count && no_irq) { |
| 98 | parport_release (dev); |
Nishanth Aravamudan | 7b4ccf8 | 2005-09-10 00:27:31 -0700 | [diff] [blame] | 99 | schedule_timeout_interruptible(wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | parport_claim_or_block (dev); |
| 101 | } |
| 102 | else |
| 103 | /* We must have the device claimed here */ |
| 104 | parport_wait_event (port, wait); |
| 105 | |
| 106 | /* Is there a signal pending? */ |
| 107 | if (signal_pending (current)) |
| 108 | break; |
| 109 | |
| 110 | /* Wait longer next time. */ |
| 111 | wait *= 2; |
| 112 | } while (time_before (jiffies, expire)); |
| 113 | |
| 114 | if (signal_pending (current)) |
| 115 | break; |
| 116 | |
| 117 | DPRINTK (KERN_DEBUG "%s: Timed out\n", port->name); |
| 118 | break; |
| 119 | |
| 120 | ready: |
| 121 | /* Write the character to the data lines. */ |
| 122 | byte = *addr++; |
| 123 | parport_write_data (port, byte); |
| 124 | udelay (1); |
| 125 | |
| 126 | /* Pulse strobe. */ |
| 127 | parport_write_control (port, ctl | PARPORT_CONTROL_STROBE); |
| 128 | udelay (1); /* strobe */ |
| 129 | |
| 130 | parport_write_control (port, ctl); |
| 131 | udelay (1); /* hold */ |
| 132 | |
| 133 | /* Assume the peripheral received it. */ |
| 134 | count++; |
| 135 | |
| 136 | /* Let another process run if it needs to. */ |
| 137 | if (time_before (jiffies, expire)) |
| 138 | if (!parport_yield_blocking (dev) |
| 139 | && need_resched()) |
| 140 | schedule (); |
| 141 | } |
| 142 | stop: |
| 143 | port->physport->ieee1284.phase = IEEE1284_PH_FWD_IDLE; |
| 144 | |
| 145 | return count; |
| 146 | } |
| 147 | |
| 148 | /* Nibble mode. */ |
| 149 | size_t parport_ieee1284_read_nibble (struct parport *port, |
| 150 | void *buffer, size_t len, |
| 151 | int flags) |
| 152 | { |
| 153 | #ifndef CONFIG_PARPORT_1284 |
| 154 | return 0; |
| 155 | #else |
| 156 | unsigned char *buf = buffer; |
| 157 | int i; |
| 158 | unsigned char byte = 0; |
| 159 | |
| 160 | len *= 2; /* in nibbles */ |
| 161 | for (i=0; i < len; i++) { |
| 162 | unsigned char nibble; |
| 163 | |
| 164 | /* Does the error line indicate end of data? */ |
| 165 | if (((i & 1) == 0) && |
| 166 | (parport_read_status(port) & PARPORT_STATUS_ERROR)) { |
Marko Kohtala | 742ec65 | 2006-01-06 00:19:44 -0800 | [diff] [blame] | 167 | goto end_of_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | } |
| 169 | |
| 170 | /* Event 7: Set nAutoFd low. */ |
| 171 | parport_frob_control (port, |
| 172 | PARPORT_CONTROL_AUTOFD, |
| 173 | PARPORT_CONTROL_AUTOFD); |
| 174 | |
| 175 | /* Event 9: nAck goes low. */ |
| 176 | port->ieee1284.phase = IEEE1284_PH_REV_DATA; |
| 177 | if (parport_wait_peripheral (port, |
| 178 | PARPORT_STATUS_ACK, 0)) { |
| 179 | /* Timeout -- no more data? */ |
| 180 | DPRINTK (KERN_DEBUG |
| 181 | "%s: Nibble timeout at event 9 (%d bytes)\n", |
| 182 | port->name, i/2); |
| 183 | parport_frob_control (port, PARPORT_CONTROL_AUTOFD, 0); |
| 184 | break; |
| 185 | } |
| 186 | |
| 187 | |
| 188 | /* Read a nibble. */ |
| 189 | nibble = parport_read_status (port) >> 3; |
| 190 | nibble &= ~8; |
| 191 | if ((nibble & 0x10) == 0) |
| 192 | nibble |= 8; |
| 193 | nibble &= 0xf; |
| 194 | |
| 195 | /* Event 10: Set nAutoFd high. */ |
| 196 | parport_frob_control (port, PARPORT_CONTROL_AUTOFD, 0); |
| 197 | |
| 198 | /* Event 11: nAck goes high. */ |
| 199 | if (parport_wait_peripheral (port, |
| 200 | PARPORT_STATUS_ACK, |
| 201 | PARPORT_STATUS_ACK)) { |
| 202 | /* Timeout -- no more data? */ |
| 203 | DPRINTK (KERN_DEBUG |
| 204 | "%s: Nibble timeout at event 11\n", |
| 205 | port->name); |
| 206 | break; |
| 207 | } |
| 208 | |
| 209 | if (i & 1) { |
| 210 | /* Second nibble */ |
| 211 | byte |= nibble << 4; |
| 212 | *buf++ = byte; |
| 213 | } else |
| 214 | byte = nibble; |
| 215 | } |
| 216 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | if (i == len) { |
| 218 | /* Read the last nibble without checking data avail. */ |
Marko Kohtala | 742ec65 | 2006-01-06 00:19:44 -0800 | [diff] [blame] | 219 | if (parport_read_status (port) & PARPORT_STATUS_ERROR) { |
| 220 | end_of_data: |
| 221 | DPRINTK (KERN_DEBUG |
| 222 | "%s: No more nibble data (%d bytes)\n", |
| 223 | port->name, i/2); |
| 224 | |
| 225 | /* Go to reverse idle phase. */ |
| 226 | parport_frob_control (port, |
| 227 | PARPORT_CONTROL_AUTOFD, |
| 228 | PARPORT_CONTROL_AUTOFD); |
| 229 | port->physport->ieee1284.phase = IEEE1284_PH_REV_IDLE; |
| 230 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | else |
Marko Kohtala | 742ec65 | 2006-01-06 00:19:44 -0800 | [diff] [blame] | 232 | port->physport->ieee1284.phase = IEEE1284_PH_HBUSY_DAVAIL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | } |
| 234 | |
Marko Kohtala | 742ec65 | 2006-01-06 00:19:44 -0800 | [diff] [blame] | 235 | return i/2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | #endif /* IEEE1284 support */ |
| 237 | } |
| 238 | |
| 239 | /* Byte mode. */ |
| 240 | size_t parport_ieee1284_read_byte (struct parport *port, |
| 241 | void *buffer, size_t len, |
| 242 | int flags) |
| 243 | { |
| 244 | #ifndef CONFIG_PARPORT_1284 |
| 245 | return 0; |
| 246 | #else |
| 247 | unsigned char *buf = buffer; |
| 248 | ssize_t count = 0; |
| 249 | |
| 250 | for (count = 0; count < len; count++) { |
| 251 | unsigned char byte; |
| 252 | |
| 253 | /* Data available? */ |
| 254 | if (parport_read_status (port) & PARPORT_STATUS_ERROR) { |
Marko Kohtala | 742ec65 | 2006-01-06 00:19:44 -0800 | [diff] [blame] | 255 | goto end_of_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | } |
| 257 | |
| 258 | /* Event 14: Place data bus in high impedance state. */ |
| 259 | parport_data_reverse (port); |
| 260 | |
| 261 | /* Event 7: Set nAutoFd low. */ |
| 262 | parport_frob_control (port, |
| 263 | PARPORT_CONTROL_AUTOFD, |
| 264 | PARPORT_CONTROL_AUTOFD); |
| 265 | |
| 266 | /* Event 9: nAck goes low. */ |
| 267 | port->physport->ieee1284.phase = IEEE1284_PH_REV_DATA; |
| 268 | if (parport_wait_peripheral (port, |
| 269 | PARPORT_STATUS_ACK, |
| 270 | 0)) { |
| 271 | /* Timeout -- no more data? */ |
| 272 | parport_frob_control (port, PARPORT_CONTROL_AUTOFD, |
| 273 | 0); |
| 274 | DPRINTK (KERN_DEBUG "%s: Byte timeout at event 9\n", |
| 275 | port->name); |
| 276 | break; |
| 277 | } |
| 278 | |
| 279 | byte = parport_read_data (port); |
| 280 | *buf++ = byte; |
| 281 | |
| 282 | /* Event 10: Set nAutoFd high */ |
| 283 | parport_frob_control (port, PARPORT_CONTROL_AUTOFD, 0); |
| 284 | |
| 285 | /* Event 11: nAck goes high. */ |
| 286 | if (parport_wait_peripheral (port, |
| 287 | PARPORT_STATUS_ACK, |
| 288 | PARPORT_STATUS_ACK)) { |
| 289 | /* Timeout -- no more data? */ |
| 290 | DPRINTK (KERN_DEBUG "%s: Byte timeout at event 11\n", |
| 291 | port->name); |
| 292 | break; |
| 293 | } |
| 294 | |
| 295 | /* Event 16: Set nStrobe low. */ |
| 296 | parport_frob_control (port, |
| 297 | PARPORT_CONTROL_STROBE, |
| 298 | PARPORT_CONTROL_STROBE); |
| 299 | udelay (5); |
| 300 | |
| 301 | /* Event 17: Set nStrobe high. */ |
| 302 | parport_frob_control (port, PARPORT_CONTROL_STROBE, 0); |
| 303 | } |
| 304 | |
| 305 | if (count == len) { |
| 306 | /* Read the last byte without checking data avail. */ |
Marko Kohtala | 742ec65 | 2006-01-06 00:19:44 -0800 | [diff] [blame] | 307 | if (parport_read_status (port) & PARPORT_STATUS_ERROR) { |
| 308 | end_of_data: |
| 309 | DPRINTK (KERN_DEBUG |
Alexey Dobriyan | 5b5e092 | 2017-02-27 14:30:02 -0800 | [diff] [blame] | 310 | "%s: No more byte data (%zd bytes)\n", |
Marko Kohtala | 742ec65 | 2006-01-06 00:19:44 -0800 | [diff] [blame] | 311 | port->name, count); |
| 312 | |
| 313 | /* Go to reverse idle phase. */ |
| 314 | parport_frob_control (port, |
| 315 | PARPORT_CONTROL_AUTOFD, |
| 316 | PARPORT_CONTROL_AUTOFD); |
| 317 | port->physport->ieee1284.phase = IEEE1284_PH_REV_IDLE; |
| 318 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | else |
Marko Kohtala | 742ec65 | 2006-01-06 00:19:44 -0800 | [diff] [blame] | 320 | port->physport->ieee1284.phase = IEEE1284_PH_HBUSY_DAVAIL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | } |
| 322 | |
| 323 | return count; |
| 324 | #endif /* IEEE1284 support */ |
| 325 | } |
| 326 | |
| 327 | /*** * |
| 328 | * ECP Functions. * |
| 329 | * ***/ |
| 330 | |
| 331 | #ifdef CONFIG_PARPORT_1284 |
| 332 | |
| 333 | static inline |
| 334 | int ecp_forward_to_reverse (struct parport *port) |
| 335 | { |
| 336 | int retval; |
| 337 | |
| 338 | /* Event 38: Set nAutoFd low */ |
| 339 | parport_frob_control (port, |
| 340 | PARPORT_CONTROL_AUTOFD, |
| 341 | PARPORT_CONTROL_AUTOFD); |
| 342 | parport_data_reverse (port); |
| 343 | udelay (5); |
| 344 | |
| 345 | /* Event 39: Set nInit low to initiate bus reversal */ |
| 346 | parport_frob_control (port, |
| 347 | PARPORT_CONTROL_INIT, |
| 348 | 0); |
| 349 | |
| 350 | /* Event 40: PError goes low */ |
| 351 | retval = parport_wait_peripheral (port, |
| 352 | PARPORT_STATUS_PAPEROUT, 0); |
| 353 | |
| 354 | if (!retval) { |
| 355 | DPRINTK (KERN_DEBUG "%s: ECP direction: reverse\n", |
| 356 | port->name); |
| 357 | port->ieee1284.phase = IEEE1284_PH_REV_IDLE; |
| 358 | } else { |
| 359 | DPRINTK (KERN_DEBUG "%s: ECP direction: failed to reverse\n", |
| 360 | port->name); |
| 361 | port->ieee1284.phase = IEEE1284_PH_ECP_DIR_UNKNOWN; |
| 362 | } |
| 363 | |
| 364 | return retval; |
| 365 | } |
| 366 | |
| 367 | static inline |
| 368 | int ecp_reverse_to_forward (struct parport *port) |
| 369 | { |
| 370 | int retval; |
| 371 | |
| 372 | /* Event 47: Set nInit high */ |
| 373 | parport_frob_control (port, |
| 374 | PARPORT_CONTROL_INIT |
| 375 | | PARPORT_CONTROL_AUTOFD, |
| 376 | PARPORT_CONTROL_INIT |
| 377 | | PARPORT_CONTROL_AUTOFD); |
| 378 | |
| 379 | /* Event 49: PError goes high */ |
| 380 | retval = parport_wait_peripheral (port, |
| 381 | PARPORT_STATUS_PAPEROUT, |
| 382 | PARPORT_STATUS_PAPEROUT); |
| 383 | |
| 384 | if (!retval) { |
| 385 | parport_data_forward (port); |
| 386 | DPRINTK (KERN_DEBUG "%s: ECP direction: forward\n", |
| 387 | port->name); |
| 388 | port->ieee1284.phase = IEEE1284_PH_FWD_IDLE; |
| 389 | } else { |
| 390 | DPRINTK (KERN_DEBUG |
| 391 | "%s: ECP direction: failed to switch forward\n", |
| 392 | port->name); |
| 393 | port->ieee1284.phase = IEEE1284_PH_ECP_DIR_UNKNOWN; |
| 394 | } |
| 395 | |
| 396 | |
| 397 | return retval; |
| 398 | } |
| 399 | |
| 400 | #endif /* IEEE1284 support */ |
| 401 | |
| 402 | /* ECP mode, forward channel, data. */ |
| 403 | size_t parport_ieee1284_ecp_write_data (struct parport *port, |
| 404 | const void *buffer, size_t len, |
| 405 | int flags) |
| 406 | { |
| 407 | #ifndef CONFIG_PARPORT_1284 |
| 408 | return 0; |
| 409 | #else |
| 410 | const unsigned char *buf = buffer; |
| 411 | size_t written; |
| 412 | int retry; |
| 413 | |
| 414 | port = port->physport; |
| 415 | |
| 416 | if (port->ieee1284.phase != IEEE1284_PH_FWD_IDLE) |
| 417 | if (ecp_reverse_to_forward (port)) |
| 418 | return 0; |
| 419 | |
| 420 | port->ieee1284.phase = IEEE1284_PH_FWD_DATA; |
| 421 | |
| 422 | /* HostAck high (data, not command) */ |
| 423 | parport_frob_control (port, |
| 424 | PARPORT_CONTROL_AUTOFD |
| 425 | | PARPORT_CONTROL_STROBE |
| 426 | | PARPORT_CONTROL_INIT, |
| 427 | PARPORT_CONTROL_INIT); |
| 428 | for (written = 0; written < len; written++, buf++) { |
| 429 | unsigned long expire = jiffies + port->cad->timeout; |
| 430 | unsigned char byte; |
| 431 | |
| 432 | byte = *buf; |
| 433 | try_again: |
| 434 | parport_write_data (port, byte); |
| 435 | parport_frob_control (port, PARPORT_CONTROL_STROBE, |
| 436 | PARPORT_CONTROL_STROBE); |
| 437 | udelay (5); |
| 438 | for (retry = 0; retry < 100; retry++) { |
| 439 | if (!parport_wait_peripheral (port, |
| 440 | PARPORT_STATUS_BUSY, 0)) |
| 441 | goto success; |
| 442 | |
| 443 | if (signal_pending (current)) { |
| 444 | parport_frob_control (port, |
| 445 | PARPORT_CONTROL_STROBE, |
| 446 | 0); |
| 447 | break; |
| 448 | } |
| 449 | } |
| 450 | |
| 451 | /* Time for Host Transfer Recovery (page 41 of IEEE1284) */ |
| 452 | DPRINTK (KERN_DEBUG "%s: ECP transfer stalled!\n", port->name); |
| 453 | |
| 454 | parport_frob_control (port, PARPORT_CONTROL_INIT, |
| 455 | PARPORT_CONTROL_INIT); |
| 456 | udelay (50); |
| 457 | if (parport_read_status (port) & PARPORT_STATUS_PAPEROUT) { |
| 458 | /* It's buggered. */ |
| 459 | parport_frob_control (port, PARPORT_CONTROL_INIT, 0); |
| 460 | break; |
| 461 | } |
| 462 | |
| 463 | parport_frob_control (port, PARPORT_CONTROL_INIT, 0); |
| 464 | udelay (50); |
| 465 | if (!(parport_read_status (port) & PARPORT_STATUS_PAPEROUT)) |
| 466 | break; |
| 467 | |
| 468 | DPRINTK (KERN_DEBUG "%s: Host transfer recovered\n", |
| 469 | port->name); |
| 470 | |
| 471 | if (time_after_eq (jiffies, expire)) break; |
| 472 | goto try_again; |
| 473 | success: |
| 474 | parport_frob_control (port, PARPORT_CONTROL_STROBE, 0); |
| 475 | udelay (5); |
| 476 | if (parport_wait_peripheral (port, |
| 477 | PARPORT_STATUS_BUSY, |
| 478 | PARPORT_STATUS_BUSY)) |
| 479 | /* Peripheral hasn't accepted the data. */ |
| 480 | break; |
| 481 | } |
| 482 | |
| 483 | port->ieee1284.phase = IEEE1284_PH_FWD_IDLE; |
| 484 | |
| 485 | return written; |
| 486 | #endif /* IEEE1284 support */ |
| 487 | } |
| 488 | |
| 489 | /* ECP mode, reverse channel, data. */ |
| 490 | size_t parport_ieee1284_ecp_read_data (struct parport *port, |
| 491 | void *buffer, size_t len, int flags) |
| 492 | { |
| 493 | #ifndef CONFIG_PARPORT_1284 |
| 494 | return 0; |
| 495 | #else |
| 496 | struct pardevice *dev = port->cad; |
| 497 | unsigned char *buf = buffer; |
| 498 | int rle_count = 0; /* shut gcc up */ |
| 499 | unsigned char ctl; |
| 500 | int rle = 0; |
| 501 | ssize_t count = 0; |
| 502 | |
| 503 | port = port->physport; |
| 504 | |
| 505 | if (port->ieee1284.phase != IEEE1284_PH_REV_IDLE) |
| 506 | if (ecp_forward_to_reverse (port)) |
| 507 | return 0; |
| 508 | |
| 509 | port->ieee1284.phase = IEEE1284_PH_REV_DATA; |
| 510 | |
| 511 | /* Set HostAck low to start accepting data. */ |
| 512 | ctl = parport_read_control (port); |
| 513 | ctl &= ~(PARPORT_CONTROL_STROBE | PARPORT_CONTROL_INIT | |
| 514 | PARPORT_CONTROL_AUTOFD); |
| 515 | parport_write_control (port, |
| 516 | ctl | PARPORT_CONTROL_AUTOFD); |
| 517 | while (count < len) { |
| 518 | unsigned long expire = jiffies + dev->timeout; |
| 519 | unsigned char byte; |
| 520 | int command; |
| 521 | |
| 522 | /* Event 43: Peripheral sets nAck low. It can take as |
| 523 | long as it wants. */ |
| 524 | while (parport_wait_peripheral (port, PARPORT_STATUS_ACK, 0)) { |
| 525 | /* The peripheral hasn't given us data in |
| 526 | 35ms. If we have data to give back to the |
| 527 | caller, do it now. */ |
| 528 | if (count) |
| 529 | goto out; |
| 530 | |
| 531 | /* If we've used up all the time we were allowed, |
| 532 | give up altogether. */ |
| 533 | if (!time_before (jiffies, expire)) |
| 534 | goto out; |
| 535 | |
| 536 | /* Yield the port for a while. */ |
| 537 | if (count && dev->port->irq != PARPORT_IRQ_NONE) { |
| 538 | parport_release (dev); |
Nishanth Aravamudan | 7b4ccf8 | 2005-09-10 00:27:31 -0700 | [diff] [blame] | 539 | schedule_timeout_interruptible(msecs_to_jiffies(40)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 540 | parport_claim_or_block (dev); |
| 541 | } |
| 542 | else |
| 543 | /* We must have the device claimed here. */ |
Nishanth Aravamudan | 7b4ccf8 | 2005-09-10 00:27:31 -0700 | [diff] [blame] | 544 | parport_wait_event (port, msecs_to_jiffies(40)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | |
| 546 | /* Is there a signal pending? */ |
| 547 | if (signal_pending (current)) |
| 548 | goto out; |
| 549 | } |
| 550 | |
| 551 | /* Is this a command? */ |
| 552 | if (rle) |
| 553 | /* The last byte was a run-length count, so |
| 554 | this can't be as well. */ |
| 555 | command = 0; |
| 556 | else |
| 557 | command = (parport_read_status (port) & |
| 558 | PARPORT_STATUS_BUSY) ? 1 : 0; |
| 559 | |
| 560 | /* Read the data. */ |
| 561 | byte = parport_read_data (port); |
| 562 | |
| 563 | /* If this is a channel command, rather than an RLE |
| 564 | command or a normal data byte, don't accept it. */ |
| 565 | if (command) { |
| 566 | if (byte & 0x80) { |
| 567 | DPRINTK (KERN_DEBUG "%s: stopping short at " |
| 568 | "channel command (%02x)\n", |
| 569 | port->name, byte); |
| 570 | goto out; |
| 571 | } |
| 572 | else if (port->ieee1284.mode != IEEE1284_MODE_ECPRLE) |
| 573 | DPRINTK (KERN_DEBUG "%s: device illegally " |
| 574 | "using RLE; accepting anyway\n", |
| 575 | port->name); |
| 576 | |
| 577 | rle_count = byte + 1; |
| 578 | |
| 579 | /* Are we allowed to read that many bytes? */ |
| 580 | if (rle_count > (len - count)) { |
| 581 | DPRINTK (KERN_DEBUG "%s: leaving %d RLE bytes " |
| 582 | "for next time\n", port->name, |
| 583 | rle_count); |
| 584 | break; |
| 585 | } |
| 586 | |
| 587 | rle = 1; |
| 588 | } |
| 589 | |
| 590 | /* Event 44: Set HostAck high, acknowledging handshake. */ |
| 591 | parport_write_control (port, ctl); |
| 592 | |
| 593 | /* Event 45: The peripheral has 35ms to set nAck high. */ |
| 594 | if (parport_wait_peripheral (port, PARPORT_STATUS_ACK, |
| 595 | PARPORT_STATUS_ACK)) { |
| 596 | /* It's gone wrong. Return what data we have |
| 597 | to the caller. */ |
| 598 | DPRINTK (KERN_DEBUG "ECP read timed out at 45\n"); |
| 599 | |
| 600 | if (command) |
| 601 | printk (KERN_WARNING |
| 602 | "%s: command ignored (%02x)\n", |
| 603 | port->name, byte); |
| 604 | |
| 605 | break; |
| 606 | } |
| 607 | |
| 608 | /* Event 46: Set HostAck low and accept the data. */ |
| 609 | parport_write_control (port, |
| 610 | ctl | PARPORT_CONTROL_AUTOFD); |
| 611 | |
| 612 | /* If we just read a run-length count, fetch the data. */ |
| 613 | if (command) |
| 614 | continue; |
| 615 | |
| 616 | /* If this is the byte after a run-length count, decompress. */ |
| 617 | if (rle) { |
| 618 | rle = 0; |
| 619 | memset (buf, byte, rle_count); |
| 620 | buf += rle_count; |
| 621 | count += rle_count; |
| 622 | DPRINTK (KERN_DEBUG "%s: decompressed to %d bytes\n", |
| 623 | port->name, rle_count); |
| 624 | } else { |
| 625 | /* Normal data byte. */ |
| 626 | *buf = byte; |
| 627 | buf++, count++; |
| 628 | } |
| 629 | } |
| 630 | |
| 631 | out: |
| 632 | port->ieee1284.phase = IEEE1284_PH_REV_IDLE; |
| 633 | return count; |
| 634 | #endif /* IEEE1284 support */ |
| 635 | } |
| 636 | |
| 637 | /* ECP mode, forward channel, commands. */ |
| 638 | size_t parport_ieee1284_ecp_write_addr (struct parport *port, |
| 639 | const void *buffer, size_t len, |
| 640 | int flags) |
| 641 | { |
| 642 | #ifndef CONFIG_PARPORT_1284 |
| 643 | return 0; |
| 644 | #else |
| 645 | const unsigned char *buf = buffer; |
| 646 | size_t written; |
| 647 | int retry; |
| 648 | |
| 649 | port = port->physport; |
| 650 | |
| 651 | if (port->ieee1284.phase != IEEE1284_PH_FWD_IDLE) |
| 652 | if (ecp_reverse_to_forward (port)) |
| 653 | return 0; |
| 654 | |
| 655 | port->ieee1284.phase = IEEE1284_PH_FWD_DATA; |
| 656 | |
| 657 | /* HostAck low (command, not data) */ |
| 658 | parport_frob_control (port, |
| 659 | PARPORT_CONTROL_AUTOFD |
| 660 | | PARPORT_CONTROL_STROBE |
| 661 | | PARPORT_CONTROL_INIT, |
| 662 | PARPORT_CONTROL_AUTOFD |
| 663 | | PARPORT_CONTROL_INIT); |
| 664 | for (written = 0; written < len; written++, buf++) { |
| 665 | unsigned long expire = jiffies + port->cad->timeout; |
| 666 | unsigned char byte; |
| 667 | |
| 668 | byte = *buf; |
| 669 | try_again: |
| 670 | parport_write_data (port, byte); |
| 671 | parport_frob_control (port, PARPORT_CONTROL_STROBE, |
| 672 | PARPORT_CONTROL_STROBE); |
| 673 | udelay (5); |
| 674 | for (retry = 0; retry < 100; retry++) { |
| 675 | if (!parport_wait_peripheral (port, |
| 676 | PARPORT_STATUS_BUSY, 0)) |
| 677 | goto success; |
| 678 | |
| 679 | if (signal_pending (current)) { |
| 680 | parport_frob_control (port, |
| 681 | PARPORT_CONTROL_STROBE, |
| 682 | 0); |
| 683 | break; |
| 684 | } |
| 685 | } |
| 686 | |
| 687 | /* Time for Host Transfer Recovery (page 41 of IEEE1284) */ |
| 688 | DPRINTK (KERN_DEBUG "%s: ECP transfer stalled!\n", port->name); |
| 689 | |
| 690 | parport_frob_control (port, PARPORT_CONTROL_INIT, |
| 691 | PARPORT_CONTROL_INIT); |
| 692 | udelay (50); |
| 693 | if (parport_read_status (port) & PARPORT_STATUS_PAPEROUT) { |
| 694 | /* It's buggered. */ |
| 695 | parport_frob_control (port, PARPORT_CONTROL_INIT, 0); |
| 696 | break; |
| 697 | } |
| 698 | |
| 699 | parport_frob_control (port, PARPORT_CONTROL_INIT, 0); |
| 700 | udelay (50); |
| 701 | if (!(parport_read_status (port) & PARPORT_STATUS_PAPEROUT)) |
| 702 | break; |
| 703 | |
| 704 | DPRINTK (KERN_DEBUG "%s: Host transfer recovered\n", |
| 705 | port->name); |
| 706 | |
| 707 | if (time_after_eq (jiffies, expire)) break; |
| 708 | goto try_again; |
| 709 | success: |
| 710 | parport_frob_control (port, PARPORT_CONTROL_STROBE, 0); |
| 711 | udelay (5); |
| 712 | if (parport_wait_peripheral (port, |
| 713 | PARPORT_STATUS_BUSY, |
| 714 | PARPORT_STATUS_BUSY)) |
| 715 | /* Peripheral hasn't accepted the data. */ |
| 716 | break; |
| 717 | } |
| 718 | |
| 719 | port->ieee1284.phase = IEEE1284_PH_FWD_IDLE; |
| 720 | |
| 721 | return written; |
| 722 | #endif /* IEEE1284 support */ |
| 723 | } |
| 724 | |
| 725 | /*** * |
| 726 | * EPP functions. * |
| 727 | * ***/ |
| 728 | |
| 729 | /* EPP mode, forward channel, data. */ |
| 730 | size_t parport_ieee1284_epp_write_data (struct parport *port, |
| 731 | const void *buffer, size_t len, |
| 732 | int flags) |
| 733 | { |
| 734 | unsigned char *bp = (unsigned char *) buffer; |
| 735 | size_t ret = 0; |
| 736 | |
| 737 | /* set EPP idle state (just to make sure) with strobe low */ |
| 738 | parport_frob_control (port, |
| 739 | PARPORT_CONTROL_STROBE | |
| 740 | PARPORT_CONTROL_AUTOFD | |
| 741 | PARPORT_CONTROL_SELECT | |
| 742 | PARPORT_CONTROL_INIT, |
| 743 | PARPORT_CONTROL_STROBE | |
| 744 | PARPORT_CONTROL_INIT); |
| 745 | port->ops->data_forward (port); |
| 746 | for (; len > 0; len--, bp++) { |
| 747 | /* Event 62: Write data and set autofd low */ |
| 748 | parport_write_data (port, *bp); |
| 749 | parport_frob_control (port, PARPORT_CONTROL_AUTOFD, |
| 750 | PARPORT_CONTROL_AUTOFD); |
| 751 | |
| 752 | /* Event 58: wait for busy (nWait) to go high */ |
| 753 | if (parport_poll_peripheral (port, PARPORT_STATUS_BUSY, 0, 10)) |
| 754 | break; |
| 755 | |
| 756 | /* Event 63: set nAutoFd (nDStrb) high */ |
| 757 | parport_frob_control (port, PARPORT_CONTROL_AUTOFD, 0); |
| 758 | |
| 759 | /* Event 60: wait for busy (nWait) to go low */ |
| 760 | if (parport_poll_peripheral (port, PARPORT_STATUS_BUSY, |
| 761 | PARPORT_STATUS_BUSY, 5)) |
| 762 | break; |
| 763 | |
| 764 | ret++; |
| 765 | } |
| 766 | |
| 767 | /* Event 61: set strobe (nWrite) high */ |
| 768 | parport_frob_control (port, PARPORT_CONTROL_STROBE, 0); |
| 769 | |
| 770 | return ret; |
| 771 | } |
| 772 | |
| 773 | /* EPP mode, reverse channel, data. */ |
| 774 | size_t parport_ieee1284_epp_read_data (struct parport *port, |
| 775 | void *buffer, size_t len, |
| 776 | int flags) |
| 777 | { |
| 778 | unsigned char *bp = (unsigned char *) buffer; |
| 779 | unsigned ret = 0; |
| 780 | |
| 781 | /* set EPP idle state (just to make sure) with strobe high */ |
| 782 | parport_frob_control (port, |
| 783 | PARPORT_CONTROL_STROBE | |
| 784 | PARPORT_CONTROL_AUTOFD | |
| 785 | PARPORT_CONTROL_SELECT | |
| 786 | PARPORT_CONTROL_INIT, |
| 787 | PARPORT_CONTROL_INIT); |
| 788 | port->ops->data_reverse (port); |
| 789 | for (; len > 0; len--, bp++) { |
| 790 | /* Event 67: set nAutoFd (nDStrb) low */ |
| 791 | parport_frob_control (port, |
| 792 | PARPORT_CONTROL_AUTOFD, |
| 793 | PARPORT_CONTROL_AUTOFD); |
| 794 | /* Event 58: wait for Busy to go high */ |
| 795 | if (parport_wait_peripheral (port, PARPORT_STATUS_BUSY, 0)) { |
| 796 | break; |
| 797 | } |
| 798 | |
| 799 | *bp = parport_read_data (port); |
| 800 | |
| 801 | /* Event 63: set nAutoFd (nDStrb) high */ |
| 802 | parport_frob_control (port, PARPORT_CONTROL_AUTOFD, 0); |
| 803 | |
| 804 | /* Event 60: wait for Busy to go low */ |
| 805 | if (parport_poll_peripheral (port, PARPORT_STATUS_BUSY, |
| 806 | PARPORT_STATUS_BUSY, 5)) { |
| 807 | break; |
| 808 | } |
| 809 | |
| 810 | ret++; |
| 811 | } |
| 812 | port->ops->data_forward (port); |
| 813 | |
| 814 | return ret; |
| 815 | } |
| 816 | |
| 817 | /* EPP mode, forward channel, addresses. */ |
| 818 | size_t parport_ieee1284_epp_write_addr (struct parport *port, |
| 819 | const void *buffer, size_t len, |
| 820 | int flags) |
| 821 | { |
| 822 | unsigned char *bp = (unsigned char *) buffer; |
| 823 | size_t ret = 0; |
| 824 | |
| 825 | /* set EPP idle state (just to make sure) with strobe low */ |
| 826 | parport_frob_control (port, |
| 827 | PARPORT_CONTROL_STROBE | |
| 828 | PARPORT_CONTROL_AUTOFD | |
| 829 | PARPORT_CONTROL_SELECT | |
| 830 | PARPORT_CONTROL_INIT, |
| 831 | PARPORT_CONTROL_STROBE | |
| 832 | PARPORT_CONTROL_INIT); |
| 833 | port->ops->data_forward (port); |
| 834 | for (; len > 0; len--, bp++) { |
| 835 | /* Event 56: Write data and set nAStrb low. */ |
| 836 | parport_write_data (port, *bp); |
| 837 | parport_frob_control (port, PARPORT_CONTROL_SELECT, |
| 838 | PARPORT_CONTROL_SELECT); |
| 839 | |
| 840 | /* Event 58: wait for busy (nWait) to go high */ |
| 841 | if (parport_poll_peripheral (port, PARPORT_STATUS_BUSY, 0, 10)) |
| 842 | break; |
| 843 | |
| 844 | /* Event 59: set nAStrb high */ |
| 845 | parport_frob_control (port, PARPORT_CONTROL_SELECT, 0); |
| 846 | |
| 847 | /* Event 60: wait for busy (nWait) to go low */ |
| 848 | if (parport_poll_peripheral (port, PARPORT_STATUS_BUSY, |
| 849 | PARPORT_STATUS_BUSY, 5)) |
| 850 | break; |
| 851 | |
| 852 | ret++; |
| 853 | } |
| 854 | |
| 855 | /* Event 61: set strobe (nWrite) high */ |
| 856 | parport_frob_control (port, PARPORT_CONTROL_STROBE, 0); |
| 857 | |
| 858 | return ret; |
| 859 | } |
| 860 | |
| 861 | /* EPP mode, reverse channel, addresses. */ |
| 862 | size_t parport_ieee1284_epp_read_addr (struct parport *port, |
| 863 | void *buffer, size_t len, |
| 864 | int flags) |
| 865 | { |
| 866 | unsigned char *bp = (unsigned char *) buffer; |
| 867 | unsigned ret = 0; |
| 868 | |
| 869 | /* Set EPP idle state (just to make sure) with strobe high */ |
| 870 | parport_frob_control (port, |
| 871 | PARPORT_CONTROL_STROBE | |
| 872 | PARPORT_CONTROL_AUTOFD | |
| 873 | PARPORT_CONTROL_SELECT | |
| 874 | PARPORT_CONTROL_INIT, |
| 875 | PARPORT_CONTROL_INIT); |
| 876 | port->ops->data_reverse (port); |
| 877 | for (; len > 0; len--, bp++) { |
| 878 | /* Event 64: set nSelectIn (nAStrb) low */ |
| 879 | parport_frob_control (port, PARPORT_CONTROL_SELECT, |
| 880 | PARPORT_CONTROL_SELECT); |
| 881 | |
| 882 | /* Event 58: wait for Busy to go high */ |
| 883 | if (parport_wait_peripheral (port, PARPORT_STATUS_BUSY, 0)) { |
| 884 | break; |
| 885 | } |
| 886 | |
| 887 | *bp = parport_read_data (port); |
| 888 | |
| 889 | /* Event 59: set nSelectIn (nAStrb) high */ |
| 890 | parport_frob_control (port, PARPORT_CONTROL_SELECT, |
Stephan Boettcher | 13050d8 | 2008-02-08 04:20:56 -0800 | [diff] [blame] | 891 | 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 892 | |
| 893 | /* Event 60: wait for Busy to go low */ |
| 894 | if (parport_poll_peripheral (port, PARPORT_STATUS_BUSY, |
| 895 | PARPORT_STATUS_BUSY, 5)) |
| 896 | break; |
| 897 | |
| 898 | ret++; |
| 899 | } |
| 900 | port->ops->data_forward (port); |
| 901 | |
| 902 | return ret; |
| 903 | } |
| 904 | |
| 905 | EXPORT_SYMBOL(parport_ieee1284_ecp_write_data); |
| 906 | EXPORT_SYMBOL(parport_ieee1284_ecp_read_data); |
| 907 | EXPORT_SYMBOL(parport_ieee1284_ecp_write_addr); |
| 908 | EXPORT_SYMBOL(parport_ieee1284_write_compat); |
| 909 | EXPORT_SYMBOL(parport_ieee1284_read_nibble); |
| 910 | EXPORT_SYMBOL(parport_ieee1284_read_byte); |
| 911 | EXPORT_SYMBOL(parport_ieee1284_epp_write_data); |
| 912 | EXPORT_SYMBOL(parport_ieee1284_epp_read_data); |
| 913 | EXPORT_SYMBOL(parport_ieee1284_epp_write_addr); |
| 914 | EXPORT_SYMBOL(parport_ieee1284_epp_read_addr); |