Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* ppa.c -- low level driver for the IOMEGA PPA3 |
| 2 | * parallel port SCSI host adapter. |
| 3 | * |
| 4 | * (The PPA3 is the embedded controller in the ZIP drive.) |
| 5 | * |
| 6 | * (c) 1995,1996 Grant R. Guenther, grant@torque.net, |
| 7 | * under the terms of the GNU General Public License. |
| 8 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | */ |
| 10 | |
| 11 | #include <linux/config.h> |
| 12 | #include <linux/init.h> |
| 13 | #include <linux/kernel.h> |
| 14 | #include <linux/module.h> |
| 15 | #include <linux/blkdev.h> |
| 16 | #include <linux/parport.h> |
| 17 | #include <linux/workqueue.h> |
Jeff Garzik | 68b3aa7 | 2005-05-28 07:56:31 -0400 | [diff] [blame] | 18 | #include <linux/delay.h> |
Marcelo Feitoza Parisi | 60c904a | 2006-03-28 01:56:47 -0800 | [diff] [blame] | 19 | #include <linux/jiffies.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <asm/io.h> |
| 21 | |
| 22 | #include <scsi/scsi.h> |
| 23 | #include <scsi/scsi_cmnd.h> |
| 24 | #include <scsi/scsi_device.h> |
| 25 | #include <scsi/scsi_host.h> |
| 26 | |
| 27 | |
| 28 | static void ppa_reset_pulse(unsigned int base); |
| 29 | |
| 30 | typedef struct { |
| 31 | struct pardevice *dev; /* Parport device entry */ |
| 32 | int base; /* Actual port address */ |
| 33 | int mode; /* Transfer mode */ |
| 34 | struct scsi_cmnd *cur_cmd; /* Current queued command */ |
| 35 | struct work_struct ppa_tq; /* Polling interrupt stuff */ |
| 36 | unsigned long jstart; /* Jiffies at start */ |
| 37 | unsigned long recon_tmo; /* How many usecs to wait for reconnection (6th bit) */ |
| 38 | unsigned int failed:1; /* Failure flag */ |
| 39 | unsigned wanted:1; /* Parport sharing busy flag */ |
| 40 | wait_queue_head_t *waiting; |
| 41 | struct Scsi_Host *host; |
| 42 | struct list_head list; |
| 43 | } ppa_struct; |
| 44 | |
| 45 | #include "ppa.h" |
| 46 | |
| 47 | static inline ppa_struct *ppa_dev(struct Scsi_Host *host) |
| 48 | { |
| 49 | return *(ppa_struct **)&host->hostdata; |
| 50 | } |
| 51 | |
| 52 | static DEFINE_SPINLOCK(arbitration_lock); |
| 53 | |
| 54 | static void got_it(ppa_struct *dev) |
| 55 | { |
| 56 | dev->base = dev->dev->port->base; |
| 57 | if (dev->cur_cmd) |
| 58 | dev->cur_cmd->SCp.phase = 1; |
| 59 | else |
| 60 | wake_up(dev->waiting); |
| 61 | } |
| 62 | |
| 63 | static void ppa_wakeup(void *ref) |
| 64 | { |
| 65 | ppa_struct *dev = (ppa_struct *) ref; |
| 66 | unsigned long flags; |
| 67 | |
| 68 | spin_lock_irqsave(&arbitration_lock, flags); |
| 69 | if (dev->wanted) { |
| 70 | parport_claim(dev->dev); |
| 71 | got_it(dev); |
| 72 | dev->wanted = 0; |
| 73 | } |
| 74 | spin_unlock_irqrestore(&arbitration_lock, flags); |
| 75 | return; |
| 76 | } |
| 77 | |
| 78 | static int ppa_pb_claim(ppa_struct *dev) |
| 79 | { |
| 80 | unsigned long flags; |
| 81 | int res = 1; |
| 82 | spin_lock_irqsave(&arbitration_lock, flags); |
| 83 | if (parport_claim(dev->dev) == 0) { |
| 84 | got_it(dev); |
| 85 | res = 0; |
| 86 | } |
| 87 | dev->wanted = res; |
| 88 | spin_unlock_irqrestore(&arbitration_lock, flags); |
| 89 | return res; |
| 90 | } |
| 91 | |
| 92 | static void ppa_pb_dismiss(ppa_struct *dev) |
| 93 | { |
| 94 | unsigned long flags; |
| 95 | int wanted; |
| 96 | spin_lock_irqsave(&arbitration_lock, flags); |
| 97 | wanted = dev->wanted; |
| 98 | dev->wanted = 0; |
| 99 | spin_unlock_irqrestore(&arbitration_lock, flags); |
| 100 | if (!wanted) |
| 101 | parport_release(dev->dev); |
| 102 | } |
| 103 | |
| 104 | static inline void ppa_pb_release(ppa_struct *dev) |
| 105 | { |
| 106 | parport_release(dev->dev); |
| 107 | } |
| 108 | |
| 109 | /* |
| 110 | * Start of Chipset kludges |
| 111 | */ |
| 112 | |
| 113 | /* This is to give the ppa driver a way to modify the timings (and other |
| 114 | * parameters) by writing to the /proc/scsi/ppa/0 file. |
| 115 | * Very simple method really... (To simple, no error checking :( ) |
| 116 | * Reason: Kernel hackers HATE having to unload and reload modules for |
| 117 | * testing... |
| 118 | * Also gives a method to use a script to obtain optimum timings (TODO) |
| 119 | */ |
| 120 | |
| 121 | static inline int ppa_proc_write(ppa_struct *dev, char *buffer, int length) |
| 122 | { |
| 123 | unsigned long x; |
| 124 | |
| 125 | if ((length > 5) && (strncmp(buffer, "mode=", 5) == 0)) { |
| 126 | x = simple_strtoul(buffer + 5, NULL, 0); |
| 127 | dev->mode = x; |
| 128 | return length; |
| 129 | } |
| 130 | if ((length > 10) && (strncmp(buffer, "recon_tmo=", 10) == 0)) { |
| 131 | x = simple_strtoul(buffer + 10, NULL, 0); |
| 132 | dev->recon_tmo = x; |
| 133 | printk("ppa: recon_tmo set to %ld\n", x); |
| 134 | return length; |
| 135 | } |
| 136 | printk("ppa /proc: invalid variable\n"); |
| 137 | return (-EINVAL); |
| 138 | } |
| 139 | |
| 140 | static int ppa_proc_info(struct Scsi_Host *host, char *buffer, char **start, off_t offset, int length, int inout) |
| 141 | { |
| 142 | int len = 0; |
| 143 | ppa_struct *dev = ppa_dev(host); |
| 144 | |
| 145 | if (inout) |
| 146 | return ppa_proc_write(dev, buffer, length); |
| 147 | |
| 148 | len += sprintf(buffer + len, "Version : %s\n", PPA_VERSION); |
| 149 | len += |
| 150 | sprintf(buffer + len, "Parport : %s\n", |
| 151 | dev->dev->port->name); |
| 152 | len += |
| 153 | sprintf(buffer + len, "Mode : %s\n", |
| 154 | PPA_MODE_STRING[dev->mode]); |
| 155 | #if PPA_DEBUG > 0 |
| 156 | len += |
| 157 | sprintf(buffer + len, "recon_tmo : %lu\n", dev->recon_tmo); |
| 158 | #endif |
| 159 | |
| 160 | /* Request for beyond end of buffer */ |
| 161 | if (offset > length) |
| 162 | return 0; |
| 163 | |
| 164 | *start = buffer + offset; |
| 165 | len -= offset; |
| 166 | if (len > length) |
| 167 | len = length; |
| 168 | return len; |
| 169 | } |
| 170 | |
| 171 | static int device_check(ppa_struct *dev); |
| 172 | |
| 173 | #if PPA_DEBUG > 0 |
| 174 | #define ppa_fail(x,y) printk("ppa: ppa_fail(%i) from %s at line %d\n",\ |
| 175 | y, __FUNCTION__, __LINE__); ppa_fail_func(x,y); |
| 176 | static inline void ppa_fail_func(ppa_struct *dev, int error_code) |
| 177 | #else |
| 178 | static inline void ppa_fail(ppa_struct *dev, int error_code) |
| 179 | #endif |
| 180 | { |
| 181 | /* If we fail a device then we trash status / message bytes */ |
| 182 | if (dev->cur_cmd) { |
| 183 | dev->cur_cmd->result = error_code << 16; |
| 184 | dev->failed = 1; |
| 185 | } |
| 186 | } |
| 187 | |
| 188 | /* |
| 189 | * Wait for the high bit to be set. |
| 190 | * |
| 191 | * In principle, this could be tied to an interrupt, but the adapter |
| 192 | * doesn't appear to be designed to support interrupts. We spin on |
| 193 | * the 0x80 ready bit. |
| 194 | */ |
| 195 | static unsigned char ppa_wait(ppa_struct *dev) |
| 196 | { |
| 197 | int k; |
| 198 | unsigned short ppb = dev->base; |
| 199 | unsigned char r; |
| 200 | |
| 201 | k = PPA_SPIN_TMO; |
| 202 | /* Wait for bit 6 and 7 - PJC */ |
| 203 | for (r = r_str(ppb); ((r & 0xc0) != 0xc0) && (k); k--) { |
| 204 | udelay(1); |
| 205 | r = r_str(ppb); |
| 206 | } |
| 207 | |
| 208 | /* |
| 209 | * return some status information. |
| 210 | * Semantics: 0xc0 = ZIP wants more data |
| 211 | * 0xd0 = ZIP wants to send more data |
| 212 | * 0xe0 = ZIP is expecting SCSI command data |
| 213 | * 0xf0 = end of transfer, ZIP is sending status |
| 214 | */ |
| 215 | if (k) |
| 216 | return (r & 0xf0); |
| 217 | |
| 218 | /* Counter expired - Time out occurred */ |
| 219 | ppa_fail(dev, DID_TIME_OUT); |
| 220 | printk("ppa timeout in ppa_wait\n"); |
| 221 | return 0; /* command timed out */ |
| 222 | } |
| 223 | |
| 224 | /* |
| 225 | * Clear EPP Timeout Bit |
| 226 | */ |
| 227 | static inline void epp_reset(unsigned short ppb) |
| 228 | { |
| 229 | int i; |
| 230 | |
| 231 | i = r_str(ppb); |
| 232 | w_str(ppb, i); |
| 233 | w_str(ppb, i & 0xfe); |
| 234 | } |
| 235 | |
| 236 | /* |
| 237 | * Wait for empty ECP fifo (if we are in ECP fifo mode only) |
| 238 | */ |
| 239 | static inline void ecp_sync(ppa_struct *dev) |
| 240 | { |
| 241 | int i, ppb_hi = dev->dev->port->base_hi; |
| 242 | |
| 243 | if (ppb_hi == 0) |
| 244 | return; |
| 245 | |
| 246 | if ((r_ecr(ppb_hi) & 0xe0) == 0x60) { /* mode 011 == ECP fifo mode */ |
| 247 | for (i = 0; i < 100; i++) { |
| 248 | if (r_ecr(ppb_hi) & 0x01) |
| 249 | return; |
| 250 | udelay(5); |
| 251 | } |
| 252 | printk("ppa: ECP sync failed as data still present in FIFO.\n"); |
| 253 | } |
| 254 | } |
| 255 | |
| 256 | static int ppa_byte_out(unsigned short base, const char *buffer, int len) |
| 257 | { |
| 258 | int i; |
| 259 | |
| 260 | for (i = len; i; i--) { |
| 261 | w_dtr(base, *buffer++); |
| 262 | w_ctr(base, 0xe); |
| 263 | w_ctr(base, 0xc); |
| 264 | } |
| 265 | return 1; /* All went well - we hope! */ |
| 266 | } |
| 267 | |
| 268 | static int ppa_byte_in(unsigned short base, char *buffer, int len) |
| 269 | { |
| 270 | int i; |
| 271 | |
| 272 | for (i = len; i; i--) { |
| 273 | *buffer++ = r_dtr(base); |
| 274 | w_ctr(base, 0x27); |
| 275 | w_ctr(base, 0x25); |
| 276 | } |
| 277 | return 1; /* All went well - we hope! */ |
| 278 | } |
| 279 | |
| 280 | static int ppa_nibble_in(unsigned short base, char *buffer, int len) |
| 281 | { |
| 282 | for (; len; len--) { |
| 283 | unsigned char h; |
| 284 | |
| 285 | w_ctr(base, 0x4); |
| 286 | h = r_str(base) & 0xf0; |
| 287 | w_ctr(base, 0x6); |
| 288 | *buffer++ = h | ((r_str(base) & 0xf0) >> 4); |
| 289 | } |
| 290 | return 1; /* All went well - we hope! */ |
| 291 | } |
| 292 | |
| 293 | static int ppa_out(ppa_struct *dev, char *buffer, int len) |
| 294 | { |
| 295 | int r; |
| 296 | unsigned short ppb = dev->base; |
| 297 | |
| 298 | r = ppa_wait(dev); |
| 299 | |
| 300 | if ((r & 0x50) != 0x40) { |
| 301 | ppa_fail(dev, DID_ERROR); |
| 302 | return 0; |
| 303 | } |
| 304 | switch (dev->mode) { |
| 305 | case PPA_NIBBLE: |
| 306 | case PPA_PS2: |
| 307 | /* 8 bit output, with a loop */ |
| 308 | r = ppa_byte_out(ppb, buffer, len); |
| 309 | break; |
| 310 | |
| 311 | case PPA_EPP_32: |
| 312 | case PPA_EPP_16: |
| 313 | case PPA_EPP_8: |
| 314 | epp_reset(ppb); |
| 315 | w_ctr(ppb, 0x4); |
| 316 | #ifdef CONFIG_SCSI_IZIP_EPP16 |
| 317 | if (!(((long) buffer | len) & 0x01)) |
| 318 | outsw(ppb + 4, buffer, len >> 1); |
| 319 | #else |
| 320 | if (!(((long) buffer | len) & 0x03)) |
| 321 | outsl(ppb + 4, buffer, len >> 2); |
| 322 | #endif |
| 323 | else |
| 324 | outsb(ppb + 4, buffer, len); |
| 325 | w_ctr(ppb, 0xc); |
| 326 | r = !(r_str(ppb) & 0x01); |
| 327 | w_ctr(ppb, 0xc); |
| 328 | ecp_sync(dev); |
| 329 | break; |
| 330 | |
| 331 | default: |
| 332 | printk("PPA: bug in ppa_out()\n"); |
| 333 | r = 0; |
| 334 | } |
| 335 | return r; |
| 336 | } |
| 337 | |
| 338 | static int ppa_in(ppa_struct *dev, char *buffer, int len) |
| 339 | { |
| 340 | int r; |
| 341 | unsigned short ppb = dev->base; |
| 342 | |
| 343 | r = ppa_wait(dev); |
| 344 | |
| 345 | if ((r & 0x50) != 0x50) { |
| 346 | ppa_fail(dev, DID_ERROR); |
| 347 | return 0; |
| 348 | } |
| 349 | switch (dev->mode) { |
| 350 | case PPA_NIBBLE: |
| 351 | /* 4 bit input, with a loop */ |
| 352 | r = ppa_nibble_in(ppb, buffer, len); |
| 353 | w_ctr(ppb, 0xc); |
| 354 | break; |
| 355 | |
| 356 | case PPA_PS2: |
| 357 | /* 8 bit input, with a loop */ |
| 358 | w_ctr(ppb, 0x25); |
| 359 | r = ppa_byte_in(ppb, buffer, len); |
| 360 | w_ctr(ppb, 0x4); |
| 361 | w_ctr(ppb, 0xc); |
| 362 | break; |
| 363 | |
| 364 | case PPA_EPP_32: |
| 365 | case PPA_EPP_16: |
| 366 | case PPA_EPP_8: |
| 367 | epp_reset(ppb); |
| 368 | w_ctr(ppb, 0x24); |
| 369 | #ifdef CONFIG_SCSI_IZIP_EPP16 |
| 370 | if (!(((long) buffer | len) & 0x01)) |
| 371 | insw(ppb + 4, buffer, len >> 1); |
| 372 | #else |
| 373 | if (!(((long) buffer | len) & 0x03)) |
| 374 | insl(ppb + 4, buffer, len >> 2); |
| 375 | #endif |
| 376 | else |
| 377 | insb(ppb + 4, buffer, len); |
| 378 | w_ctr(ppb, 0x2c); |
| 379 | r = !(r_str(ppb) & 0x01); |
| 380 | w_ctr(ppb, 0x2c); |
| 381 | ecp_sync(dev); |
| 382 | break; |
| 383 | |
| 384 | default: |
| 385 | printk("PPA: bug in ppa_ins()\n"); |
| 386 | r = 0; |
| 387 | break; |
| 388 | } |
| 389 | return r; |
| 390 | } |
| 391 | |
| 392 | /* end of ppa_io.h */ |
| 393 | static inline void ppa_d_pulse(unsigned short ppb, unsigned char b) |
| 394 | { |
| 395 | w_dtr(ppb, b); |
| 396 | w_ctr(ppb, 0xc); |
| 397 | w_ctr(ppb, 0xe); |
| 398 | w_ctr(ppb, 0xc); |
| 399 | w_ctr(ppb, 0x4); |
| 400 | w_ctr(ppb, 0xc); |
| 401 | } |
| 402 | |
| 403 | static void ppa_disconnect(ppa_struct *dev) |
| 404 | { |
| 405 | unsigned short ppb = dev->base; |
| 406 | |
| 407 | ppa_d_pulse(ppb, 0); |
| 408 | ppa_d_pulse(ppb, 0x3c); |
| 409 | ppa_d_pulse(ppb, 0x20); |
| 410 | ppa_d_pulse(ppb, 0xf); |
| 411 | } |
| 412 | |
| 413 | static inline void ppa_c_pulse(unsigned short ppb, unsigned char b) |
| 414 | { |
| 415 | w_dtr(ppb, b); |
| 416 | w_ctr(ppb, 0x4); |
| 417 | w_ctr(ppb, 0x6); |
| 418 | w_ctr(ppb, 0x4); |
| 419 | w_ctr(ppb, 0xc); |
| 420 | } |
| 421 | |
| 422 | static inline void ppa_connect(ppa_struct *dev, int flag) |
| 423 | { |
| 424 | unsigned short ppb = dev->base; |
| 425 | |
| 426 | ppa_c_pulse(ppb, 0); |
| 427 | ppa_c_pulse(ppb, 0x3c); |
| 428 | ppa_c_pulse(ppb, 0x20); |
| 429 | if ((flag == CONNECT_EPP_MAYBE) && IN_EPP_MODE(dev->mode)) |
| 430 | ppa_c_pulse(ppb, 0xcf); |
| 431 | else |
| 432 | ppa_c_pulse(ppb, 0x8f); |
| 433 | } |
| 434 | |
| 435 | static int ppa_select(ppa_struct *dev, int target) |
| 436 | { |
| 437 | int k; |
| 438 | unsigned short ppb = dev->base; |
| 439 | |
| 440 | /* |
| 441 | * Bit 6 (0x40) is the device selected bit. |
| 442 | * First we must wait till the current device goes off line... |
| 443 | */ |
| 444 | k = PPA_SELECT_TMO; |
| 445 | do { |
| 446 | k--; |
| 447 | udelay(1); |
| 448 | } while ((r_str(ppb) & 0x40) && (k)); |
| 449 | if (!k) |
| 450 | return 0; |
| 451 | |
| 452 | w_dtr(ppb, (1 << target)); |
| 453 | w_ctr(ppb, 0xe); |
| 454 | w_ctr(ppb, 0xc); |
| 455 | w_dtr(ppb, 0x80); /* This is NOT the initator */ |
| 456 | w_ctr(ppb, 0x8); |
| 457 | |
| 458 | k = PPA_SELECT_TMO; |
| 459 | do { |
| 460 | k--; |
| 461 | udelay(1); |
| 462 | } |
| 463 | while (!(r_str(ppb) & 0x40) && (k)); |
| 464 | if (!k) |
| 465 | return 0; |
| 466 | |
| 467 | return 1; |
| 468 | } |
| 469 | |
| 470 | /* |
| 471 | * This is based on a trace of what the Iomega DOS 'guest' driver does. |
| 472 | * I've tried several different kinds of parallel ports with guest and |
| 473 | * coded this to react in the same ways that it does. |
| 474 | * |
| 475 | * The return value from this function is just a hint about where the |
| 476 | * handshaking failed. |
| 477 | * |
| 478 | */ |
| 479 | static int ppa_init(ppa_struct *dev) |
| 480 | { |
| 481 | int retv; |
| 482 | unsigned short ppb = dev->base; |
| 483 | |
| 484 | ppa_disconnect(dev); |
| 485 | ppa_connect(dev, CONNECT_NORMAL); |
| 486 | |
| 487 | retv = 2; /* Failed */ |
| 488 | |
| 489 | w_ctr(ppb, 0xe); |
| 490 | if ((r_str(ppb) & 0x08) == 0x08) |
| 491 | retv--; |
| 492 | |
| 493 | w_ctr(ppb, 0xc); |
| 494 | if ((r_str(ppb) & 0x08) == 0x00) |
| 495 | retv--; |
| 496 | |
| 497 | if (!retv) |
| 498 | ppa_reset_pulse(ppb); |
| 499 | udelay(1000); /* Allow devices to settle down */ |
| 500 | ppa_disconnect(dev); |
| 501 | udelay(1000); /* Another delay to allow devices to settle */ |
| 502 | |
| 503 | if (retv) |
| 504 | return -EIO; |
| 505 | |
| 506 | return device_check(dev); |
| 507 | } |
| 508 | |
| 509 | static inline int ppa_send_command(struct scsi_cmnd *cmd) |
| 510 | { |
| 511 | ppa_struct *dev = ppa_dev(cmd->device->host); |
| 512 | int k; |
| 513 | |
| 514 | w_ctr(dev->base, 0x0c); |
| 515 | |
| 516 | for (k = 0; k < cmd->cmd_len; k++) |
| 517 | if (!ppa_out(dev, &cmd->cmnd[k], 1)) |
| 518 | return 0; |
| 519 | return 1; |
| 520 | } |
| 521 | |
| 522 | /* |
| 523 | * The bulk flag enables some optimisations in the data transfer loops, |
| 524 | * it should be true for any command that transfers data in integral |
| 525 | * numbers of sectors. |
| 526 | * |
| 527 | * The driver appears to remain stable if we speed up the parallel port |
| 528 | * i/o in this function, but not elsewhere. |
| 529 | */ |
| 530 | static int ppa_completion(struct scsi_cmnd *cmd) |
| 531 | { |
| 532 | /* Return codes: |
| 533 | * -1 Error |
| 534 | * 0 Told to schedule |
| 535 | * 1 Finished data transfer |
| 536 | */ |
| 537 | ppa_struct *dev = ppa_dev(cmd->device->host); |
| 538 | unsigned short ppb = dev->base; |
| 539 | unsigned long start_jiffies = jiffies; |
| 540 | |
| 541 | unsigned char r, v; |
| 542 | int fast, bulk, status; |
| 543 | |
| 544 | v = cmd->cmnd[0]; |
| 545 | bulk = ((v == READ_6) || |
| 546 | (v == READ_10) || (v == WRITE_6) || (v == WRITE_10)); |
| 547 | |
| 548 | /* |
| 549 | * We only get here if the drive is ready to comunicate, |
| 550 | * hence no need for a full ppa_wait. |
| 551 | */ |
| 552 | r = (r_str(ppb) & 0xf0); |
| 553 | |
| 554 | while (r != (unsigned char) 0xf0) { |
| 555 | /* |
| 556 | * If we have been running for more than a full timer tick |
| 557 | * then take a rest. |
| 558 | */ |
| 559 | if (time_after(jiffies, start_jiffies + 1)) |
| 560 | return 0; |
| 561 | |
| 562 | if ((cmd->SCp.this_residual <= 0)) { |
| 563 | ppa_fail(dev, DID_ERROR); |
| 564 | return -1; /* ERROR_RETURN */ |
| 565 | } |
| 566 | |
| 567 | /* On some hardware we have SCSI disconnected (6th bit low) |
| 568 | * for about 100usecs. It is too expensive to wait a |
| 569 | * tick on every loop so we busy wait for no more than |
| 570 | * 500usecs to give the drive a chance first. We do not |
| 571 | * change things for "normal" hardware since generally |
| 572 | * the 6th bit is always high. |
| 573 | * This makes the CPU load higher on some hardware |
| 574 | * but otherwise we can not get more than 50K/secs |
| 575 | * on this problem hardware. |
| 576 | */ |
| 577 | if ((r & 0xc0) != 0xc0) { |
| 578 | /* Wait for reconnection should be no more than |
| 579 | * jiffy/2 = 5ms = 5000 loops |
| 580 | */ |
| 581 | unsigned long k = dev->recon_tmo; |
| 582 | for (; k && ((r = (r_str(ppb) & 0xf0)) & 0xc0) != 0xc0; |
| 583 | k--) |
| 584 | udelay(1); |
| 585 | |
| 586 | if (!k) |
| 587 | return 0; |
| 588 | } |
| 589 | |
| 590 | /* determine if we should use burst I/O */ |
| 591 | fast = (bulk && (cmd->SCp.this_residual >= PPA_BURST_SIZE)) |
| 592 | ? PPA_BURST_SIZE : 1; |
| 593 | |
| 594 | if (r == (unsigned char) 0xc0) |
| 595 | status = ppa_out(dev, cmd->SCp.ptr, fast); |
| 596 | else |
| 597 | status = ppa_in(dev, cmd->SCp.ptr, fast); |
| 598 | |
| 599 | cmd->SCp.ptr += fast; |
| 600 | cmd->SCp.this_residual -= fast; |
| 601 | |
| 602 | if (!status) { |
| 603 | ppa_fail(dev, DID_BUS_BUSY); |
| 604 | return -1; /* ERROR_RETURN */ |
| 605 | } |
| 606 | if (cmd->SCp.buffer && !cmd->SCp.this_residual) { |
| 607 | /* if scatter/gather, advance to the next segment */ |
| 608 | if (cmd->SCp.buffers_residual--) { |
| 609 | cmd->SCp.buffer++; |
| 610 | cmd->SCp.this_residual = |
| 611 | cmd->SCp.buffer->length; |
| 612 | cmd->SCp.ptr = |
| 613 | page_address(cmd->SCp.buffer->page) + |
| 614 | cmd->SCp.buffer->offset; |
| 615 | } |
| 616 | } |
| 617 | /* Now check to see if the drive is ready to comunicate */ |
| 618 | r = (r_str(ppb) & 0xf0); |
| 619 | /* If not, drop back down to the scheduler and wait a timer tick */ |
| 620 | if (!(r & 0x80)) |
| 621 | return 0; |
| 622 | } |
| 623 | return 1; /* FINISH_RETURN */ |
| 624 | } |
| 625 | |
| 626 | /* |
| 627 | * Since the PPA itself doesn't generate interrupts, we use |
| 628 | * the scheduler's task queue to generate a stream of call-backs and |
| 629 | * complete the request when the drive is ready. |
| 630 | */ |
| 631 | static void ppa_interrupt(void *data) |
| 632 | { |
| 633 | ppa_struct *dev = (ppa_struct *) data; |
| 634 | struct scsi_cmnd *cmd = dev->cur_cmd; |
| 635 | |
| 636 | if (!cmd) { |
| 637 | printk("PPA: bug in ppa_interrupt\n"); |
| 638 | return; |
| 639 | } |
| 640 | if (ppa_engine(dev, cmd)) { |
| 641 | dev->ppa_tq.data = (void *) dev; |
| 642 | schedule_delayed_work(&dev->ppa_tq, 1); |
| 643 | return; |
| 644 | } |
| 645 | /* Command must of completed hence it is safe to let go... */ |
| 646 | #if PPA_DEBUG > 0 |
| 647 | switch ((cmd->result >> 16) & 0xff) { |
| 648 | case DID_OK: |
| 649 | break; |
| 650 | case DID_NO_CONNECT: |
| 651 | printk("ppa: no device at SCSI ID %i\n", cmd->device->target); |
| 652 | break; |
| 653 | case DID_BUS_BUSY: |
| 654 | printk("ppa: BUS BUSY - EPP timeout detected\n"); |
| 655 | break; |
| 656 | case DID_TIME_OUT: |
| 657 | printk("ppa: unknown timeout\n"); |
| 658 | break; |
| 659 | case DID_ABORT: |
| 660 | printk("ppa: told to abort\n"); |
| 661 | break; |
| 662 | case DID_PARITY: |
| 663 | printk("ppa: parity error (???)\n"); |
| 664 | break; |
| 665 | case DID_ERROR: |
| 666 | printk("ppa: internal driver error\n"); |
| 667 | break; |
| 668 | case DID_RESET: |
| 669 | printk("ppa: told to reset device\n"); |
| 670 | break; |
| 671 | case DID_BAD_INTR: |
| 672 | printk("ppa: bad interrupt (???)\n"); |
| 673 | break; |
| 674 | default: |
| 675 | printk("ppa: bad return code (%02x)\n", |
| 676 | (cmd->result >> 16) & 0xff); |
| 677 | } |
| 678 | #endif |
| 679 | |
| 680 | if (cmd->SCp.phase > 1) |
| 681 | ppa_disconnect(dev); |
| 682 | |
| 683 | ppa_pb_dismiss(dev); |
| 684 | |
| 685 | dev->cur_cmd = NULL; |
| 686 | |
| 687 | cmd->scsi_done(cmd); |
| 688 | } |
| 689 | |
| 690 | static int ppa_engine(ppa_struct *dev, struct scsi_cmnd *cmd) |
| 691 | { |
| 692 | unsigned short ppb = dev->base; |
| 693 | unsigned char l = 0, h = 0; |
| 694 | int retv; |
| 695 | |
| 696 | /* First check for any errors that may of occurred |
| 697 | * Here we check for internal errors |
| 698 | */ |
| 699 | if (dev->failed) |
| 700 | return 0; |
| 701 | |
| 702 | switch (cmd->SCp.phase) { |
| 703 | case 0: /* Phase 0 - Waiting for parport */ |
| 704 | if (time_after(jiffies, dev->jstart + HZ)) { |
| 705 | /* |
| 706 | * We waited more than a second |
| 707 | * for parport to call us |
| 708 | */ |
| 709 | ppa_fail(dev, DID_BUS_BUSY); |
| 710 | return 0; |
| 711 | } |
| 712 | return 1; /* wait until ppa_wakeup claims parport */ |
| 713 | case 1: /* Phase 1 - Connected */ |
| 714 | { /* Perform a sanity check for cable unplugged */ |
| 715 | int retv = 2; /* Failed */ |
| 716 | |
| 717 | ppa_connect(dev, CONNECT_EPP_MAYBE); |
| 718 | |
| 719 | w_ctr(ppb, 0xe); |
| 720 | if ((r_str(ppb) & 0x08) == 0x08) |
| 721 | retv--; |
| 722 | |
| 723 | w_ctr(ppb, 0xc); |
| 724 | if ((r_str(ppb) & 0x08) == 0x00) |
| 725 | retv--; |
| 726 | |
| 727 | if (retv) { |
Marcelo Feitoza Parisi | 60c904a | 2006-03-28 01:56:47 -0800 | [diff] [blame] | 728 | if (time_after(jiffies, dev->jstart + (1 * HZ))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 729 | printk |
| 730 | ("ppa: Parallel port cable is unplugged!!\n"); |
| 731 | ppa_fail(dev, DID_BUS_BUSY); |
| 732 | return 0; |
| 733 | } else { |
| 734 | ppa_disconnect(dev); |
| 735 | return 1; /* Try again in a jiffy */ |
| 736 | } |
| 737 | } |
| 738 | cmd->SCp.phase++; |
| 739 | } |
| 740 | |
| 741 | case 2: /* Phase 2 - We are now talking to the scsi bus */ |
Jeff Garzik | 422c0d6 | 2005-10-24 18:05:09 -0400 | [diff] [blame] | 742 | if (!ppa_select(dev, scmd_id(cmd))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | ppa_fail(dev, DID_NO_CONNECT); |
| 744 | return 0; |
| 745 | } |
| 746 | cmd->SCp.phase++; |
| 747 | |
| 748 | case 3: /* Phase 3 - Ready to accept a command */ |
| 749 | w_ctr(ppb, 0x0c); |
| 750 | if (!(r_str(ppb) & 0x80)) |
| 751 | return 1; |
| 752 | |
| 753 | if (!ppa_send_command(cmd)) |
| 754 | return 0; |
| 755 | cmd->SCp.phase++; |
| 756 | |
| 757 | case 4: /* Phase 4 - Setup scatter/gather buffers */ |
| 758 | if (cmd->use_sg) { |
| 759 | /* if many buffers are available, start filling the first */ |
| 760 | cmd->SCp.buffer = |
| 761 | (struct scatterlist *) cmd->request_buffer; |
| 762 | cmd->SCp.this_residual = cmd->SCp.buffer->length; |
| 763 | cmd->SCp.ptr = |
| 764 | page_address(cmd->SCp.buffer->page) + |
| 765 | cmd->SCp.buffer->offset; |
| 766 | } else { |
| 767 | /* else fill the only available buffer */ |
| 768 | cmd->SCp.buffer = NULL; |
| 769 | cmd->SCp.this_residual = cmd->request_bufflen; |
| 770 | cmd->SCp.ptr = cmd->request_buffer; |
| 771 | } |
| 772 | cmd->SCp.buffers_residual = cmd->use_sg - 1; |
| 773 | cmd->SCp.phase++; |
| 774 | |
| 775 | case 5: /* Phase 5 - Data transfer stage */ |
| 776 | w_ctr(ppb, 0x0c); |
| 777 | if (!(r_str(ppb) & 0x80)) |
| 778 | return 1; |
| 779 | |
| 780 | retv = ppa_completion(cmd); |
| 781 | if (retv == -1) |
| 782 | return 0; |
| 783 | if (retv == 0) |
| 784 | return 1; |
| 785 | cmd->SCp.phase++; |
| 786 | |
| 787 | case 6: /* Phase 6 - Read status/message */ |
| 788 | cmd->result = DID_OK << 16; |
| 789 | /* Check for data overrun */ |
| 790 | if (ppa_wait(dev) != (unsigned char) 0xf0) { |
| 791 | ppa_fail(dev, DID_ERROR); |
| 792 | return 0; |
| 793 | } |
| 794 | if (ppa_in(dev, &l, 1)) { /* read status byte */ |
| 795 | /* Check for optional message byte */ |
| 796 | if (ppa_wait(dev) == (unsigned char) 0xf0) |
| 797 | ppa_in(dev, &h, 1); |
| 798 | cmd->result = |
| 799 | (DID_OK << 16) + (h << 8) + (l & STATUS_MASK); |
| 800 | } |
| 801 | return 0; /* Finished */ |
| 802 | break; |
| 803 | |
| 804 | default: |
| 805 | printk("ppa: Invalid scsi phase\n"); |
| 806 | } |
| 807 | return 0; |
| 808 | } |
| 809 | |
| 810 | static int ppa_queuecommand(struct scsi_cmnd *cmd, |
| 811 | void (*done) (struct scsi_cmnd *)) |
| 812 | { |
| 813 | ppa_struct *dev = ppa_dev(cmd->device->host); |
| 814 | |
| 815 | if (dev->cur_cmd) { |
| 816 | printk("PPA: bug in ppa_queuecommand\n"); |
| 817 | return 0; |
| 818 | } |
| 819 | dev->failed = 0; |
| 820 | dev->jstart = jiffies; |
| 821 | dev->cur_cmd = cmd; |
| 822 | cmd->scsi_done = done; |
| 823 | cmd->result = DID_ERROR << 16; /* default return code */ |
| 824 | cmd->SCp.phase = 0; /* bus free */ |
| 825 | |
| 826 | dev->ppa_tq.data = dev; |
| 827 | schedule_work(&dev->ppa_tq); |
| 828 | |
| 829 | ppa_pb_claim(dev); |
| 830 | |
| 831 | return 0; |
| 832 | } |
| 833 | |
| 834 | /* |
| 835 | * Apparently the disk->capacity attribute is off by 1 sector |
| 836 | * for all disk drives. We add the one here, but it should really |
| 837 | * be done in sd.c. Even if it gets fixed there, this will still |
| 838 | * work. |
| 839 | */ |
| 840 | static int ppa_biosparam(struct scsi_device *sdev, struct block_device *dev, |
| 841 | sector_t capacity, int ip[]) |
| 842 | { |
| 843 | ip[0] = 0x40; |
| 844 | ip[1] = 0x20; |
| 845 | ip[2] = ((unsigned long) capacity + 1) / (ip[0] * ip[1]); |
| 846 | if (ip[2] > 1024) { |
| 847 | ip[0] = 0xff; |
| 848 | ip[1] = 0x3f; |
| 849 | ip[2] = ((unsigned long) capacity + 1) / (ip[0] * ip[1]); |
| 850 | if (ip[2] > 1023) |
| 851 | ip[2] = 1023; |
| 852 | } |
| 853 | return 0; |
| 854 | } |
| 855 | |
| 856 | static int ppa_abort(struct scsi_cmnd *cmd) |
| 857 | { |
| 858 | ppa_struct *dev = ppa_dev(cmd->device->host); |
| 859 | /* |
| 860 | * There is no method for aborting commands since Iomega |
| 861 | * have tied the SCSI_MESSAGE line high in the interface |
| 862 | */ |
| 863 | |
| 864 | switch (cmd->SCp.phase) { |
| 865 | case 0: /* Do not have access to parport */ |
| 866 | case 1: /* Have not connected to interface */ |
| 867 | dev->cur_cmd = NULL; /* Forget the problem */ |
| 868 | return SUCCESS; |
| 869 | break; |
| 870 | default: /* SCSI command sent, can not abort */ |
| 871 | return FAILED; |
| 872 | break; |
| 873 | } |
| 874 | } |
| 875 | |
| 876 | static void ppa_reset_pulse(unsigned int base) |
| 877 | { |
| 878 | w_dtr(base, 0x40); |
| 879 | w_ctr(base, 0x8); |
| 880 | udelay(30); |
| 881 | w_ctr(base, 0xc); |
| 882 | } |
| 883 | |
| 884 | static int ppa_reset(struct scsi_cmnd *cmd) |
| 885 | { |
| 886 | ppa_struct *dev = ppa_dev(cmd->device->host); |
| 887 | |
| 888 | if (cmd->SCp.phase) |
| 889 | ppa_disconnect(dev); |
| 890 | dev->cur_cmd = NULL; /* Forget the problem */ |
| 891 | |
| 892 | ppa_connect(dev, CONNECT_NORMAL); |
| 893 | ppa_reset_pulse(dev->base); |
Jeff Garzik | 68b3aa7 | 2005-05-28 07:56:31 -0400 | [diff] [blame] | 894 | mdelay(1); /* device settle delay */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 895 | ppa_disconnect(dev); |
Jeff Garzik | 68b3aa7 | 2005-05-28 07:56:31 -0400 | [diff] [blame] | 896 | mdelay(1); /* device settle delay */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 897 | return SUCCESS; |
| 898 | } |
| 899 | |
| 900 | static int device_check(ppa_struct *dev) |
| 901 | { |
| 902 | /* This routine looks for a device and then attempts to use EPP |
| 903 | to send a command. If all goes as planned then EPP is available. */ |
| 904 | |
| 905 | static char cmd[6] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; |
| 906 | int loop, old_mode, status, k, ppb = dev->base; |
| 907 | unsigned char l; |
| 908 | |
| 909 | old_mode = dev->mode; |
| 910 | for (loop = 0; loop < 8; loop++) { |
| 911 | /* Attempt to use EPP for Test Unit Ready */ |
| 912 | if ((ppb & 0x0007) == 0x0000) |
| 913 | dev->mode = PPA_EPP_32; |
| 914 | |
| 915 | second_pass: |
| 916 | ppa_connect(dev, CONNECT_EPP_MAYBE); |
| 917 | /* Select SCSI device */ |
| 918 | if (!ppa_select(dev, loop)) { |
| 919 | ppa_disconnect(dev); |
| 920 | continue; |
| 921 | } |
| 922 | printk("ppa: Found device at ID %i, Attempting to use %s\n", |
| 923 | loop, PPA_MODE_STRING[dev->mode]); |
| 924 | |
| 925 | /* Send SCSI command */ |
| 926 | status = 1; |
| 927 | w_ctr(ppb, 0x0c); |
| 928 | for (l = 0; (l < 6) && (status); l++) |
| 929 | status = ppa_out(dev, cmd, 1); |
| 930 | |
| 931 | if (!status) { |
| 932 | ppa_disconnect(dev); |
| 933 | ppa_connect(dev, CONNECT_EPP_MAYBE); |
| 934 | w_dtr(ppb, 0x40); |
| 935 | w_ctr(ppb, 0x08); |
| 936 | udelay(30); |
| 937 | w_ctr(ppb, 0x0c); |
| 938 | udelay(1000); |
| 939 | ppa_disconnect(dev); |
| 940 | udelay(1000); |
| 941 | if (dev->mode == PPA_EPP_32) { |
| 942 | dev->mode = old_mode; |
| 943 | goto second_pass; |
| 944 | } |
| 945 | return -EIO; |
| 946 | } |
| 947 | w_ctr(ppb, 0x0c); |
| 948 | k = 1000000; /* 1 Second */ |
| 949 | do { |
| 950 | l = r_str(ppb); |
| 951 | k--; |
| 952 | udelay(1); |
| 953 | } while (!(l & 0x80) && (k)); |
| 954 | |
| 955 | l &= 0xf0; |
| 956 | |
| 957 | if (l != 0xf0) { |
| 958 | ppa_disconnect(dev); |
| 959 | ppa_connect(dev, CONNECT_EPP_MAYBE); |
| 960 | ppa_reset_pulse(ppb); |
| 961 | udelay(1000); |
| 962 | ppa_disconnect(dev); |
| 963 | udelay(1000); |
| 964 | if (dev->mode == PPA_EPP_32) { |
| 965 | dev->mode = old_mode; |
| 966 | goto second_pass; |
| 967 | } |
| 968 | return -EIO; |
| 969 | } |
| 970 | ppa_disconnect(dev); |
| 971 | printk("ppa: Communication established with ID %i using %s\n", |
| 972 | loop, PPA_MODE_STRING[dev->mode]); |
| 973 | ppa_connect(dev, CONNECT_EPP_MAYBE); |
| 974 | ppa_reset_pulse(ppb); |
| 975 | udelay(1000); |
| 976 | ppa_disconnect(dev); |
| 977 | udelay(1000); |
| 978 | return 0; |
| 979 | } |
| 980 | return -ENODEV; |
| 981 | } |
| 982 | |
Randy.Dunlap | 78a904b | 2006-05-19 10:11:02 -0700 | [diff] [blame] | 983 | static int ppa_adjust_queue(struct scsi_device *device) |
| 984 | { |
| 985 | blk_queue_bounce_limit(device->request_queue, BLK_BOUNCE_HIGH); |
| 986 | return 0; |
| 987 | } |
| 988 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 989 | static struct scsi_host_template ppa_template = { |
| 990 | .module = THIS_MODULE, |
| 991 | .proc_name = "ppa", |
| 992 | .proc_info = ppa_proc_info, |
| 993 | .name = "Iomega VPI0 (ppa) interface", |
| 994 | .queuecommand = ppa_queuecommand, |
| 995 | .eh_abort_handler = ppa_abort, |
| 996 | .eh_bus_reset_handler = ppa_reset, |
| 997 | .eh_host_reset_handler = ppa_reset, |
| 998 | .bios_param = ppa_biosparam, |
| 999 | .this_id = -1, |
| 1000 | .sg_tablesize = SG_ALL, |
| 1001 | .cmd_per_lun = 1, |
| 1002 | .use_clustering = ENABLE_CLUSTERING, |
| 1003 | .can_queue = 1, |
Randy.Dunlap | 78a904b | 2006-05-19 10:11:02 -0700 | [diff] [blame] | 1004 | .slave_alloc = ppa_adjust_queue, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1005 | }; |
| 1006 | |
| 1007 | /*************************************************************************** |
| 1008 | * Parallel port probing routines * |
| 1009 | ***************************************************************************/ |
| 1010 | |
| 1011 | static LIST_HEAD(ppa_hosts); |
| 1012 | |
| 1013 | static int __ppa_attach(struct parport *pb) |
| 1014 | { |
| 1015 | struct Scsi_Host *host; |
| 1016 | DECLARE_WAIT_QUEUE_HEAD(waiting); |
| 1017 | DEFINE_WAIT(wait); |
| 1018 | ppa_struct *dev; |
| 1019 | int ports; |
| 1020 | int modes, ppb, ppb_hi; |
| 1021 | int err = -ENOMEM; |
| 1022 | |
| 1023 | dev = kmalloc(sizeof(ppa_struct), GFP_KERNEL); |
| 1024 | if (!dev) |
| 1025 | return -ENOMEM; |
| 1026 | memset(dev, 0, sizeof(ppa_struct)); |
| 1027 | dev->base = -1; |
| 1028 | dev->mode = PPA_AUTODETECT; |
| 1029 | dev->recon_tmo = PPA_RECON_TMO; |
| 1030 | init_waitqueue_head(&waiting); |
| 1031 | dev->dev = parport_register_device(pb, "ppa", NULL, ppa_wakeup, |
| 1032 | NULL, 0, dev); |
| 1033 | |
| 1034 | if (!dev->dev) |
| 1035 | goto out; |
| 1036 | |
| 1037 | /* Claim the bus so it remembers what we do to the control |
| 1038 | * registers. [ CTR and ECP ] |
| 1039 | */ |
| 1040 | err = -EBUSY; |
| 1041 | dev->waiting = &waiting; |
| 1042 | prepare_to_wait(&waiting, &wait, TASK_UNINTERRUPTIBLE); |
| 1043 | if (ppa_pb_claim(dev)) |
| 1044 | schedule_timeout(3 * HZ); |
| 1045 | if (dev->wanted) { |
| 1046 | printk(KERN_ERR "ppa%d: failed to claim parport because " |
| 1047 | "a pardevice is owning the port for too long " |
| 1048 | "time!\n", pb->number); |
| 1049 | ppa_pb_dismiss(dev); |
| 1050 | dev->waiting = NULL; |
| 1051 | finish_wait(&waiting, &wait); |
| 1052 | goto out1; |
| 1053 | } |
| 1054 | dev->waiting = NULL; |
| 1055 | finish_wait(&waiting, &wait); |
| 1056 | ppb = dev->base = dev->dev->port->base; |
| 1057 | ppb_hi = dev->dev->port->base_hi; |
| 1058 | w_ctr(ppb, 0x0c); |
| 1059 | modes = dev->dev->port->modes; |
| 1060 | |
| 1061 | /* Mode detection works up the chain of speed |
| 1062 | * This avoids a nasty if-then-else-if-... tree |
| 1063 | */ |
| 1064 | dev->mode = PPA_NIBBLE; |
| 1065 | |
| 1066 | if (modes & PARPORT_MODE_TRISTATE) |
| 1067 | dev->mode = PPA_PS2; |
| 1068 | |
| 1069 | if (modes & PARPORT_MODE_ECP) { |
| 1070 | w_ecr(ppb_hi, 0x20); |
| 1071 | dev->mode = PPA_PS2; |
| 1072 | } |
| 1073 | if ((modes & PARPORT_MODE_EPP) && (modes & PARPORT_MODE_ECP)) |
| 1074 | w_ecr(ppb_hi, 0x80); |
| 1075 | |
| 1076 | /* Done configuration */ |
| 1077 | |
| 1078 | err = ppa_init(dev); |
| 1079 | ppa_pb_release(dev); |
| 1080 | |
| 1081 | if (err) |
| 1082 | goto out1; |
| 1083 | |
| 1084 | /* now the glue ... */ |
| 1085 | if (dev->mode == PPA_NIBBLE || dev->mode == PPA_PS2) |
| 1086 | ports = 3; |
| 1087 | else |
| 1088 | ports = 8; |
| 1089 | |
| 1090 | INIT_WORK(&dev->ppa_tq, ppa_interrupt, dev); |
| 1091 | |
| 1092 | err = -ENOMEM; |
| 1093 | host = scsi_host_alloc(&ppa_template, sizeof(ppa_struct *)); |
| 1094 | if (!host) |
| 1095 | goto out1; |
| 1096 | host->io_port = pb->base; |
| 1097 | host->n_io_port = ports; |
| 1098 | host->dma_channel = -1; |
| 1099 | host->unique_id = pb->number; |
| 1100 | *(ppa_struct **)&host->hostdata = dev; |
| 1101 | dev->host = host; |
| 1102 | list_add_tail(&dev->list, &ppa_hosts); |
| 1103 | err = scsi_add_host(host, NULL); |
| 1104 | if (err) |
| 1105 | goto out2; |
| 1106 | scsi_scan_host(host); |
| 1107 | return 0; |
| 1108 | out2: |
| 1109 | list_del_init(&dev->list); |
| 1110 | scsi_host_put(host); |
| 1111 | out1: |
| 1112 | parport_unregister_device(dev->dev); |
| 1113 | out: |
| 1114 | kfree(dev); |
| 1115 | return err; |
| 1116 | } |
| 1117 | |
| 1118 | static void ppa_attach(struct parport *pb) |
| 1119 | { |
| 1120 | __ppa_attach(pb); |
| 1121 | } |
| 1122 | |
| 1123 | static void ppa_detach(struct parport *pb) |
| 1124 | { |
| 1125 | ppa_struct *dev; |
| 1126 | list_for_each_entry(dev, &ppa_hosts, list) { |
| 1127 | if (dev->dev->port == pb) { |
| 1128 | list_del_init(&dev->list); |
| 1129 | scsi_remove_host(dev->host); |
| 1130 | scsi_host_put(dev->host); |
| 1131 | parport_unregister_device(dev->dev); |
| 1132 | kfree(dev); |
| 1133 | break; |
| 1134 | } |
| 1135 | } |
| 1136 | } |
| 1137 | |
| 1138 | static struct parport_driver ppa_driver = { |
| 1139 | .name = "ppa", |
| 1140 | .attach = ppa_attach, |
| 1141 | .detach = ppa_detach, |
| 1142 | }; |
| 1143 | |
| 1144 | static int __init ppa_driver_init(void) |
| 1145 | { |
| 1146 | printk("ppa: Version %s\n", PPA_VERSION); |
| 1147 | return parport_register_driver(&ppa_driver); |
| 1148 | } |
| 1149 | |
| 1150 | static void __exit ppa_driver_exit(void) |
| 1151 | { |
| 1152 | parport_unregister_driver(&ppa_driver); |
| 1153 | } |
| 1154 | |
| 1155 | module_init(ppa_driver_init); |
| 1156 | module_exit(ppa_driver_exit); |
| 1157 | MODULE_LICENSE("GPL"); |