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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 | /* ppa.c -- low level driver for the IOMEGA PPA3 parallel port SCSI host adapter. (The PPA3 is the embedded controller in the ZIP drive.) (c) 1995,1996 Grant R. Guenther, grant@torque.net, under the terms of the GNU Public License. */ /* This driver was developed without the benefit of any technical specifications for the interface. Instead, a modified version of DOSemu was used to monitor the protocol used by the DOS driver for this adapter. I have no idea how my programming model relates to IOMEGA's design. IOMEGA's driver does not generate linked commands. I've never observed a SCSI message byte in the protocol transactions, so I am assuming that as long as linked commands are not used we won't see any. So far, this driver has been tested with the embedded PPA3 in the ZIP drive, only. It can detect and adapt to 4- and 8-bit parallel ports, but there is currently no support for EPP or ECP ports, as I have been unable to make the DOS drivers work in these modes on my test rig. For more information, see the file drivers/scsi/README.ppa. */ #define PPA_VERSION "0.26" /* Change these variables here or with insmod or with a LILO or LOADLIN command line argument */ static int ppa_base = 0x378; /* parallel port address */ static int ppa_speed_high = 1; /* port delay in data phase */ static int ppa_speed_low = 6; /* port delay otherwise */ static int ppa_nybble = 0; /* don't force nybble mode */ #define PPA_CAN_QUEUE 1 /* use "queueing" interface */ #define PPA_SELECT_TMO 5000 /* how long to wait for target ? */ #define PPA_SPIN_TMO 5000000 /* ppa_wait loop limiter */ #define PPA_SECTOR_SIZE 512 /* for a performance hack only */ #include <linux/stddef.h> #include <linux/module.h> #include <linux/kernel.h> #include <linux/tqueue.h> #include <linux/ioport.h> #include <linux/delay.h> #include <linux/blk.h> #include <linux/proc_fs.h> #include <linux/stat.h> #include <asm/io.h> #include "sd.h" #include "hosts.h" #include "ppa.h" struct proc_dir_entry proc_scsi_ppa = { PROC_SCSI_PPA, 3, "ppa", S_IFDIR|S_IRUGO|S_IXUGO, 2 }; static int ppa_abort_flag = 0; static int ppa_error_code = DID_OK; static char ppa_info_string[132]; static Scsi_Cmnd *ppa_current = 0; static void (*ppa_done) (Scsi_Cmnd *); static int ppa_port_delay; void out_p( short port, char byte) { outb(byte,ppa_base+port); udelay(ppa_port_delay); } char in_p( short port) { return inb(ppa_base+port); udelay(ppa_port_delay); } void ppa_d_pulse( char b ) { out_p(0,b); out_p(2,0xc); out_p(2,0xe); out_p(2,0xc); out_p(2,0x4); out_p(2,0xc); } void ppa_disconnect( void ) { ppa_d_pulse(0); ppa_d_pulse(0x3c); ppa_d_pulse(0x20); ppa_d_pulse(0xf); } void ppa_c_pulse( char b ) { out_p(0,b); out_p(2,0x4); out_p(2,0x6); out_p(2,0x4); out_p(2,0xc); } void ppa_connect( void ) { ppa_c_pulse(0); ppa_c_pulse(0x3c); ppa_c_pulse(0x20); ppa_c_pulse(0x8f); } void ppa_do_reset( void ) { out_p(2,0); /* This is really just a guess */ udelay(100); } char ppa_select( int initiator, int target ) { char r; int k; r = in_p(1); out_p(0,(1<<target)); out_p(2,0xe); out_p(2,0xc); out_p(0,(1<<initiator)); out_p(2,0x8); k = 0; while ( !(r = (in_p(1) & 0xf0)) && (k++ < PPA_SELECT_TMO)) barrier(); return r; } char ppa_wait( void ) /* Wait for the high bit to be set. In principle, this could be tied to an interrupt, but the adapter doesn't appear to be designed to support interrupts. We spin on the 0x80 ready bit. */ { int k; char r; ppa_error_code = DID_OK; k = 0; while (!((r = in_p(1)) & 0x80) && (k++ < PPA_SPIN_TMO) && !ppa_abort_flag ) barrier(); if (ppa_abort_flag) { if (ppa_abort_flag == 1) ppa_error_code = DID_ABORT; else { ppa_do_reset(); ppa_error_code = DID_RESET; } ppa_disconnect(); return 0; } if (k >= PPA_SPIN_TMO) { ppa_error_code = DID_TIME_OUT; ppa_disconnect(); return 0; /* command timed out */ } return (r & 0xf0); } int ppa_init( void ) /* This is based on a trace of what the Iomega DOS 'guest' driver does. I've tried several different kinds of parallel ports with guest and coded this to react in the same ways that it does. The return value from this function is just a hint about where the handshaking failed. */ { char r, s; out_p(0,0xaa); if (in_p(0) != (char) 0xaa) return 1; ppa_disconnect(); ppa_connect(); out_p(2,0x6); if ((in_p(1) & 0xf0) != 0xf0) return 2; out_p(2,0x4); if ((in_p(1) & 0xf0) != 0x80) return 3; ppa_disconnect(); s = in_p(2); out_p(2,0xec); out_p(0,0x55); r = in_p(0); if (r != (char) 0xff) { ppa_nybble = 1; if (r != (char) 0x55) return 4; out_p(0,0xaa); if (in_p(0) != (char) 0xaa) return 5; } out_p(2,s); ppa_connect(); out_p(0,0x40); out_p(2,0x8); out_p(2,0xc); ppa_disconnect(); return 0; } int ppa_start( Scsi_Cmnd * cmd ) { int k; ppa_error_code = DID_OK; ppa_abort_flag = 0; if (cmd->target == PPA_INITIATOR) { ppa_error_code = DID_BAD_TARGET; return 0; } ppa_connect(); if (!ppa_select(PPA_INITIATOR,cmd->target)) { ppa_disconnect(); ppa_error_code = DID_NO_CONNECT; return 0; } out_p(2,0xc); for (k=0; k < cmd->cmd_len; k++) { /* send the command */ if (!ppa_wait()) return 0; out_p(0,cmd->cmnd[k]); out_p(2,0xe); out_p(2,0xc); } #ifdef PPA_DEBUG printk("PPA: command out: "); for (k=0; k < cmd->cmd_len; k++) printk("%3x",(cmd->cmnd[k]) & 0xff ); printk("\n"); #endif return 1; } int ppa_completion( Scsi_Cmnd * cmd ) /* The bulk flag enables some optimisations in the data transfer loops, it should be true for any command that transfers data in integral numbers of sectors. The driver appears to remain stable if we speed up the parallel port i/o in this function, but not elsewhere. */ { char r, l, h, v; int dir, cnt, blen, fast, bulk; char *buffer; #ifdef PPA_DEBUG int k; #endif if (!(r = ppa_wait())) return 0; v = cmd->cmnd[0]; bulk = ((v==READ_6)||(v==READ_10)||(v==WRITE_6)||(v==WRITE_10)); buffer = cmd->request_buffer; blen = cmd->request_bufflen; cnt = 0; dir = 0; if (r == (char) 0xc0) dir = 1; /* d0 = read c0 = write f0 = status */ ppa_port_delay = ppa_speed_high; while (r != (char) 0xf0) { if (((r & 0xc0) != 0xc0 ) || (cnt >= blen)) { ppa_disconnect(); ppa_error_code = DID_ERROR; return 0; } fast = bulk && ((blen - cnt) >= PPA_SECTOR_SIZE); if (dir) do { out_p(0,buffer[cnt++]); out_p(2,0xe); out_p(2,0xc); if (!fast) break; } while (cnt % PPA_SECTOR_SIZE); else { if (ppa_nybble) do { out_p(2,0x4); h = in_p(1); out_p(2,0x6); l = in_p(1); v = ((l >> 4) & 0x0f) + (h & 0xf0); buffer[cnt++] = v; if (!fast) break; } while (cnt % PPA_SECTOR_SIZE); else do { out_p(2,0x25); v = in_p(0); out_p(2,0x27); buffer[cnt++] = v; if (!fast) break; } while (cnt % PPA_SECTOR_SIZE); if (!ppa_nybble) { out_p(2,0x5); out_p(2,0x4); } out_p(2,0xc); } if (!(r = ppa_wait())) return 0; } ppa_port_delay = ppa_speed_low; out_p(2,0x4); /* now read status byte */ h = in_p(1); out_p(2,0x6); l = in_p(1); out_p(2,0xc); r = ((l >> 4) & 0x0f) + (h & 0xf0); out_p(2,0xe); out_p(2,0xc); ppa_disconnect(); #ifdef PPA_DEBUG printk("PPA: status: %x, data[%d]: ",r & STATUS_MASK,cnt); if (cnt > 12) cnt = 12; for (k=0; k < cnt; k++) printk("%3x",buffer[k] & 0xff ); printk("\n"); #endif return (r & STATUS_MASK); } /* deprecated synchronous interface */ int ppa_command( Scsi_Cmnd * cmd ) { int s; sti(); s = 0; if (ppa_start(cmd)) if (ppa_wait()) s = ppa_completion(cmd); return s + (ppa_error_code << 16); } /* pseudo-interrupt queueing interface */ /* Since the PPA itself doesn't generate interrupts, we use the scheduler's task queue to generate a stream of call-backs and complete the request when the drive is ready. */ static void ppa_interrupt( void *data); static struct tq_struct ppa_tq = {0,0,ppa_interrupt,NULL}; static void ppa_interrupt( void *data) { Scsi_Cmnd *cmd; void (*done) (Scsi_Cmnd *); cmd = ppa_current; done = ppa_done; if (!cmd) return; if (ppa_abort_flag) { ppa_disconnect(); if(ppa_abort_flag == 1) cmd->result = DID_ABORT << 16; else { ppa_do_reset(); cmd->result = DID_RESET << 16; } ppa_current = 0; done(cmd); return; } if (!( in_p(1) & 0x80)) { queue_task(&ppa_tq,&tq_scheduler); return; } cmd->result = ppa_completion(cmd) + (ppa_error_code << 16); ppa_current = 0; done(cmd); return; } int ppa_queuecommand( Scsi_Cmnd * cmd, void (*done) (Scsi_Cmnd *)) { if (ppa_current) return 0; sti(); ppa_current = cmd; ppa_done = done; if (!ppa_start(cmd)) { cmd->result = ppa_error_code << 16; ppa_current = 0; done(cmd); return 0; } queue_task(&ppa_tq,&tq_scheduler); return 0; } int ppa_detect( Scsi_Host_Template * host ) { struct Scsi_Host *hreg; int rs; /* can we have the ports ? */ if (check_region(ppa_base,3)) { printk("PPA: ports at 0x%3x are not available\n",ppa_base); return 0; } /* attempt to initialise the controller */ ppa_port_delay = ppa_speed_low; rs = ppa_init(); if (rs) { printk("PPA: unable to initialise controller at 0x%x, error %d\n", ppa_base,rs); return 0; } /* now the glue ... */ host->proc_dir = &proc_scsi_ppa; request_region(ppa_base,3,"ppa"); host->can_queue = PPA_CAN_QUEUE; hreg = scsi_register(host,0); hreg->io_port = ppa_base; hreg->n_io_port = 3; hreg->dma_channel = -1; sprintf(ppa_info_string, "PPA driver version %s using %d-bit mode on port 0x%x.", PPA_VERSION,8-ppa_nybble*4,ppa_base); host->name = ppa_info_string; return 1; /* 1 host detected */ } int ppa_biosparam( Disk * disk, kdev_t dev, int ip[]) /* Apparently the the disk->capacity attribute is off by 1 sector for all disk drives. We add the one here, but it should really be done in sd.c. Even if it gets fixed there, this will still work. */ { ip[0] = 0x40; ip[1] = 0x20; ip[2] = (disk->capacity +1) / (ip[0] * ip[1]); if (ip[2] > 1024) { ip[0] = 0xff; ip[1] = 0x3f; ip[2] = (disk->capacity +1) / (ip[0] * ip[1]); if (ip[2] > 1023) ip[2] = 1023; } return 0; } int ppa_abort( Scsi_Cmnd * cmd ) { ppa_abort_flag = 1; return SCSI_ABORT_SNOOZE; } int ppa_reset( Scsi_Cmnd * cmd ) { ppa_abort_flag = 2; return SCSI_RESET_PUNT; } const char *ppa_info( struct Scsi_Host * host ) { return ppa_info_string; } #ifndef MODULE /* Command line parameters (for built-in driver): Syntax: ppa=base[,speed_high[,speed_low[,nybble]]] For example: ppa=0x378 or ppa=0x378,0,3 */ void ppa_setup(char *str, int *ints) { if (ints[0] > 0) ppa_base = ints[1]; if (ints[0] > 1) ppa_speed_high = ints[2]; if (ints[0] > 2) ppa_speed_low = ints[3]; if (ints[0] > 3) ppa_nybble = ints[4]; if (ints[0] > 4) ppa_nybble = ints[5]; } #else Scsi_Host_Template driver_template = PPA; #include "scsi_module.c" #endif /* end of ppa.c */ |