1 /* -*- mode: c; c-basic-offset: 8 -*- */ 2 3 /* NCR (or Symbios) 53c700 and 53c700-66 Driver 4 * 5 * Copyright (C) 2001 by James.Bottomley@HansenPartnership.com 6 **----------------------------------------------------------------------------- 7 ** 8 ** This program is free software; you can redistribute it and/or modify 9 ** it under the terms of the GNU General Public License as published by 10 ** the Free Software Foundation; either version 2 of the License, or 11 ** (at your option) any later version. 12 ** 13 ** This program is distributed in the hope that it will be useful, 14 ** but WITHOUT ANY WARRANTY; without even the implied warranty of 15 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 ** GNU General Public License for more details. 17 ** 18 ** You should have received a copy of the GNU General Public License 19 ** along with this program; if not, write to the Free Software 20 ** Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 21 ** 22 **----------------------------------------------------------------------------- 23 */ 24 25 /* Notes: 26 * 27 * This driver is designed exclusively for these chips (virtually the 28 * earliest of the scripts engine chips). They need their own drivers 29 * because they are missing so many of the scripts and snazzy register 30 * features of their elder brothers (the 710, 720 and 770). 31 * 32 * The 700 is the lowliest of the line, it can only do async SCSI. 33 * The 700-66 can at least do synchronous SCSI up to 10MHz. 34 * 35 * The 700 chip has no host bus interface logic of its own. However, 36 * it is usually mapped to a location with well defined register 37 * offsets. Therefore, if you can determine the base address and the 38 * irq your board incorporating this chip uses, you can probably use 39 * this driver to run it (although you'll probably have to write a 40 * minimal wrapper for the purpose---see the NCR_D700 driver for 41 * details about how to do this). 42 * 43 * 44 * TODO List: 45 * 46 * 1. Better statistics in the proc fs 47 * 48 * 2. Implement message queue (queues SCSI messages like commands) and make 49 * the abort and device reset functions use them. 50 * */ 51 52 /* CHANGELOG 53 * 54 * Version 2.8 55 * 56 * Fixed bad bug affecting tag starvation processing (previously the 57 * driver would hang the system if too many tags starved. Also fixed 58 * bad bug having to do with 10 byte command processing and REQUEST 59 * SENSE (the command would loop forever getting a transfer length 60 * mismatch in the CMD phase). 61 * 62 * Version 2.7 63 * 64 * Fixed scripts problem which caused certain devices (notably CDRWs) 65 * to hang on initial INQUIRY. Updated NCR_700_readl/writel to use 66 * __raw_readl/writel for parisc compatibility (Thomas 67 * Bogendoerfer). Added missing SCp->request_bufflen initialisation 68 * for sense requests (Ryan Bradetich). 69 * 70 * Version 2.6 71 * 72 * Following test of the 64 bit parisc kernel by Richard Hirst, 73 * several problems have now been corrected. Also adds support for 74 * consistent memory allocation. 75 * 76 * Version 2.5 77 * 78 * More Compatibility changes for 710 (now actually works). Enhanced 79 * support for odd clock speeds which constrain SDTR negotiations. 80 * correct cacheline separation for scsi messages and status for 81 * incoherent architectures. Use of the pci mapping functions on 82 * buffers to begin support for 64 bit drivers. 83 * 84 * Version 2.4 85 * 86 * Added support for the 53c710 chip (in 53c700 emulation mode only---no 87 * special 53c710 instructions or registers are used). 88 * 89 * Version 2.3 90 * 91 * More endianness/cache coherency changes. 92 * 93 * Better bad device handling (handles devices lying about tag 94 * queueing support and devices which fail to provide sense data on 95 * contingent allegiance conditions) 96 * 97 * Many thanks to Richard Hirst <rhirst@linuxcare.com> for patiently 98 * debugging this driver on the parisc architecture and suggesting 99 * many improvements and bug fixes. 100 * 101 * Thanks also go to Linuxcare Inc. for providing several PARISC 102 * machines for me to debug the driver on. 103 * 104 * Version 2.2 105 * 106 * Made the driver mem or io mapped; added endian invariance; added 107 * dma cache flushing operations for architectures which need it; 108 * added support for more varied clocking speeds. 109 * 110 * Version 2.1 111 * 112 * Initial modularisation from the D700. See NCR_D700.c for the rest of 113 * the changelog. 114 * */ 115 #define NCR_700_VERSION "2.8" 116 117 #include <linux/config.h> 118 #include <linux/kernel.h> 119 #include <linux/types.h> 120 #include <linux/string.h> 121 #include <linux/ioport.h> 122 #include <linux/delay.h> 123 #include <linux/spinlock.h> 124 #include <linux/completion.h> 125 #include <linux/sched.h> 126 #include <linux/init.h> 127 #include <linux/proc_fs.h> 128 #include <linux/blkdev.h> 129 #include <linux/module.h> 130 #include <linux/interrupt.h> 131 #include <asm/dma.h> 132 #include <asm/system.h> 133 #include <asm/io.h> 134 #include <asm/pgtable.h> 135 #include <asm/byteorder.h> 136 137 #include <scsi/scsi.h> 138 #include <scsi/scsi_cmnd.h> 139 #include <scsi/scsi_dbg.h> 140 #include <scsi/scsi_eh.h> 141 #include <scsi/scsi_host.h> 142 #include <scsi/scsi_tcq.h> 143 #include <scsi/scsi_transport.h> 144 #include <scsi/scsi_transport_spi.h> 145 146 #include "53c700.h" 147 148 /* NOTE: For 64 bit drivers there are points in the code where we use 149 * a non dereferenceable pointer to point to a structure in dma-able 150 * memory (which is 32 bits) so that we can use all of the structure 151 * operations but take the address at the end. This macro allows us 152 * to truncate the 64 bit pointer down to 32 bits without the compiler 153 * complaining */ 154 #define to32bit(x) ((__u32)((unsigned long)(x))) 155 156 #ifdef NCR_700_DEBUG 157 #define STATIC 158 #else 159 #define STATIC static 160 #endif 161 162 MODULE_AUTHOR("James Bottomley"); 163 MODULE_DESCRIPTION("53c700 and 53c700-66 Driver"); 164 MODULE_LICENSE("GPL"); 165 166 /* This is the script */ 167 #include "53c700_d.h" 168 169 170 STATIC int NCR_700_queuecommand(struct scsi_cmnd *, void (*done)(struct scsi_cmnd *)); 171 STATIC int NCR_700_abort(struct scsi_cmnd * SCpnt); 172 STATIC int NCR_700_bus_reset(struct scsi_cmnd * SCpnt); 173 STATIC int NCR_700_host_reset(struct scsi_cmnd * SCpnt); 174 STATIC void NCR_700_chip_setup(struct Scsi_Host *host); 175 STATIC void NCR_700_chip_reset(struct Scsi_Host *host); 176 STATIC int NCR_700_slave_configure(struct scsi_device *SDpnt); 177 STATIC void NCR_700_slave_destroy(struct scsi_device *SDpnt); 178 static int NCR_700_change_queue_depth(struct scsi_device *SDpnt, int depth); 179 static int NCR_700_change_queue_type(struct scsi_device *SDpnt, int depth); 180 181 STATIC struct device_attribute *NCR_700_dev_attrs[]; 182 183 STATIC struct scsi_transport_template *NCR_700_transport_template = NULL; 184 185 static char *NCR_700_phase[] = { 186 "", 187 "after selection", 188 "before command phase", 189 "after command phase", 190 "after status phase", 191 "after data in phase", 192 "after data out phase", 193 "during data phase", 194 }; 195 196 static char *NCR_700_condition[] = { 197 "", 198 "NOT MSG_OUT", 199 "UNEXPECTED PHASE", 200 "NOT MSG_IN", 201 "UNEXPECTED MSG", 202 "MSG_IN", 203 "SDTR_MSG RECEIVED", 204 "REJECT_MSG RECEIVED", 205 "DISCONNECT_MSG RECEIVED", 206 "MSG_OUT", 207 "DATA_IN", 208 209 }; 210 211 static char *NCR_700_fatal_messages[] = { 212 "unexpected message after reselection", 213 "still MSG_OUT after message injection", 214 "not MSG_IN after selection", 215 "Illegal message length received", 216 }; 217 218 static char *NCR_700_SBCL_bits[] = { 219 "IO ", 220 "CD ", 221 "MSG ", 222 "ATN ", 223 "SEL ", 224 "BSY ", 225 "ACK ", 226 "REQ ", 227 }; 228 229 static char *NCR_700_SBCL_to_phase[] = { 230 "DATA_OUT", 231 "DATA_IN", 232 "CMD_OUT", 233 "STATE", 234 "ILLEGAL PHASE", 235 "ILLEGAL PHASE", 236 "MSG OUT", 237 "MSG IN", 238 }; 239 240 static __u8 NCR_700_SDTR_msg[] = { 241 0x01, /* Extended message */ 242 0x03, /* Extended message Length */ 243 0x01, /* SDTR Extended message */ 244 NCR_700_MIN_PERIOD, 245 NCR_700_MAX_OFFSET 246 }; 247 248 /* This translates the SDTR message offset and period to a value 249 * which can be loaded into the SXFER_REG. 250 * 251 * NOTE: According to SCSI-2, the true transfer period (in ns) is 252 * actually four times this period value */ 253 static inline __u8 254 NCR_700_offset_period_to_sxfer(struct NCR_700_Host_Parameters *hostdata, 255 __u8 offset, __u8 period) 256 { 257 int XFERP; 258 259 __u8 min_xferp = (hostdata->chip710 260 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP); 261 __u8 max_offset = (hostdata->chip710 262 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET); 263 264 if(offset == 0) 265 return 0; 266 267 if(period < hostdata->min_period) { 268 printk(KERN_WARNING "53c700: Period %dns is less than this chip's minimum, setting to %d\n", period*4, NCR_700_SDTR_msg[3]*4); 269 period = hostdata->min_period; 270 } 271 XFERP = (period*4 * hostdata->sync_clock)/1000 - 4; 272 if(offset > max_offset) { 273 printk(KERN_WARNING "53c700: Offset %d exceeds chip maximum, setting to %d\n", 274 offset, max_offset); 275 offset = max_offset; 276 } 277 if(XFERP < min_xferp) { 278 printk(KERN_WARNING "53c700: XFERP %d is less than minium, setting to %d\n", 279 XFERP, min_xferp); 280 XFERP = min_xferp; 281 } 282 return (offset & 0x0f) | (XFERP & 0x07)<<4; 283 } 284 285 static inline __u8 286 NCR_700_get_SXFER(struct scsi_device *SDp) 287 { 288 struct NCR_700_Host_Parameters *hostdata = 289 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0]; 290 291 return NCR_700_offset_period_to_sxfer(hostdata, 292 spi_offset(SDp->sdev_target), 293 spi_period(SDp->sdev_target)); 294 } 295 296 struct Scsi_Host * 297 NCR_700_detect(struct scsi_host_template *tpnt, 298 struct NCR_700_Host_Parameters *hostdata, struct device *dev) 299 { 300 dma_addr_t pScript, pSlots; 301 __u8 *memory; 302 __u32 *script; 303 struct Scsi_Host *host; 304 static int banner = 0; 305 int j; 306 307 if(tpnt->sdev_attrs == NULL) 308 tpnt->sdev_attrs = NCR_700_dev_attrs; 309 310 memory = dma_alloc_noncoherent(hostdata->dev, TOTAL_MEM_SIZE, 311 &pScript, GFP_KERNEL); 312 if(memory == NULL) { 313 printk(KERN_ERR "53c700: Failed to allocate memory for driver, detatching\n"); 314 return NULL; 315 } 316 317 script = (__u32 *)memory; 318 hostdata->msgin = memory + MSGIN_OFFSET; 319 hostdata->msgout = memory + MSGOUT_OFFSET; 320 hostdata->status = memory + STATUS_OFFSET; 321 /* all of these offsets are L1_CACHE_BYTES separated. It is fatal 322 * if this isn't sufficient separation to avoid dma flushing issues */ 323 BUG_ON(!dma_is_consistent(pScript) && L1_CACHE_BYTES < dma_get_cache_alignment()); 324 hostdata->slots = (struct NCR_700_command_slot *)(memory + SLOTS_OFFSET); 325 hostdata->dev = dev; 326 327 pSlots = pScript + SLOTS_OFFSET; 328 329 /* Fill in the missing routines from the host template */ 330 tpnt->queuecommand = NCR_700_queuecommand; 331 tpnt->eh_abort_handler = NCR_700_abort; 332 tpnt->eh_bus_reset_handler = NCR_700_bus_reset; 333 tpnt->eh_host_reset_handler = NCR_700_host_reset; 334 tpnt->can_queue = NCR_700_COMMAND_SLOTS_PER_HOST; 335 tpnt->sg_tablesize = NCR_700_SG_SEGMENTS; 336 tpnt->cmd_per_lun = NCR_700_CMD_PER_LUN; 337 tpnt->use_clustering = ENABLE_CLUSTERING; 338 tpnt->slave_configure = NCR_700_slave_configure; 339 tpnt->slave_destroy = NCR_700_slave_destroy; 340 tpnt->change_queue_depth = NCR_700_change_queue_depth; 341 tpnt->change_queue_type = NCR_700_change_queue_type; 342 343 if(tpnt->name == NULL) 344 tpnt->name = "53c700"; 345 if(tpnt->proc_name == NULL) 346 tpnt->proc_name = "53c700"; 347 348 349 host = scsi_host_alloc(tpnt, 4); 350 if (!host) 351 return NULL; 352 memset(hostdata->slots, 0, sizeof(struct NCR_700_command_slot) 353 * NCR_700_COMMAND_SLOTS_PER_HOST); 354 for(j = 0; j < NCR_700_COMMAND_SLOTS_PER_HOST; j++) { 355 dma_addr_t offset = (dma_addr_t)((unsigned long)&hostdata->slots[j].SG[0] 356 - (unsigned long)&hostdata->slots[0].SG[0]); 357 hostdata->slots[j].pSG = (struct NCR_700_SG_List *)((unsigned long)(pSlots + offset)); 358 if(j == 0) 359 hostdata->free_list = &hostdata->slots[j]; 360 else 361 hostdata->slots[j-1].ITL_forw = &hostdata->slots[j]; 362 hostdata->slots[j].state = NCR_700_SLOT_FREE; 363 } 364 365 for(j = 0; j < sizeof(SCRIPT)/sizeof(SCRIPT[0]); j++) { 366 script[j] = bS_to_host(SCRIPT[j]); 367 } 368 369 /* adjust all labels to be bus physical */ 370 for(j = 0; j < PATCHES; j++) { 371 script[LABELPATCHES[j]] = bS_to_host(pScript + SCRIPT[LABELPATCHES[j]]); 372 } 373 /* now patch up fixed addresses. */ 374 script_patch_32(script, MessageLocation, 375 pScript + MSGOUT_OFFSET); 376 script_patch_32(script, StatusAddress, 377 pScript + STATUS_OFFSET); 378 script_patch_32(script, ReceiveMsgAddress, 379 pScript + MSGIN_OFFSET); 380 381 hostdata->script = script; 382 hostdata->pScript = pScript; 383 dma_sync_single_for_device(hostdata->dev, pScript, sizeof(SCRIPT), DMA_TO_DEVICE); 384 hostdata->state = NCR_700_HOST_FREE; 385 hostdata->cmd = NULL; 386 host->max_id = 7; 387 host->max_lun = NCR_700_MAX_LUNS; 388 BUG_ON(NCR_700_transport_template == NULL); 389 host->transportt = NCR_700_transport_template; 390 host->unique_id = (unsigned long)hostdata->base; 391 hostdata->eh_complete = NULL; 392 host->hostdata[0] = (unsigned long)hostdata; 393 /* kick the chip */ 394 NCR_700_writeb(0xff, host, CTEST9_REG); 395 if(hostdata->chip710) 396 hostdata->rev = (NCR_700_readb(host, CTEST8_REG)>>4) & 0x0f; 397 else 398 hostdata->rev = (NCR_700_readb(host, CTEST7_REG)>>4) & 0x0f; 399 hostdata->fast = (NCR_700_readb(host, CTEST9_REG) == 0); 400 if(banner == 0) { 401 printk(KERN_NOTICE "53c700: Version " NCR_700_VERSION " By James.Bottomley@HansenPartnership.com\n"); 402 banner = 1; 403 } 404 printk(KERN_NOTICE "scsi%d: %s rev %d %s\n", host->host_no, 405 hostdata->chip710 ? "53c710" : 406 (hostdata->fast ? "53c700-66" : "53c700"), 407 hostdata->rev, hostdata->differential ? 408 "(Differential)" : ""); 409 /* reset the chip */ 410 NCR_700_chip_reset(host); 411 412 if (scsi_add_host(host, dev)) { 413 dev_printk(KERN_ERR, dev, "53c700: scsi_add_host failed\n"); 414 scsi_host_put(host); 415 return NULL; 416 } 417 418 spi_signalling(host) = hostdata->differential ? SPI_SIGNAL_HVD : 419 SPI_SIGNAL_SE; 420 421 return host; 422 } 423 424 int 425 NCR_700_release(struct Scsi_Host *host) 426 { 427 struct NCR_700_Host_Parameters *hostdata = 428 (struct NCR_700_Host_Parameters *)host->hostdata[0]; 429 430 dma_free_noncoherent(hostdata->dev, TOTAL_MEM_SIZE, 431 hostdata->script, hostdata->pScript); 432 return 1; 433 } 434 435 static inline __u8 436 NCR_700_identify(int can_disconnect, __u8 lun) 437 { 438 return IDENTIFY_BASE | 439 ((can_disconnect) ? 0x40 : 0) | 440 (lun & NCR_700_LUN_MASK); 441 } 442 443 /* 444 * Function : static int data_residual (Scsi_Host *host) 445 * 446 * Purpose : return residual data count of what's in the chip. If you 447 * really want to know what this function is doing, it's almost a 448 * direct transcription of the algorithm described in the 53c710 449 * guide, except that the DBC and DFIFO registers are only 6 bits 450 * wide on a 53c700. 451 * 452 * Inputs : host - SCSI host */ 453 static inline int 454 NCR_700_data_residual (struct Scsi_Host *host) { 455 struct NCR_700_Host_Parameters *hostdata = 456 (struct NCR_700_Host_Parameters *)host->hostdata[0]; 457 int count, synchronous = 0; 458 unsigned int ddir; 459 460 if(hostdata->chip710) { 461 count = ((NCR_700_readb(host, DFIFO_REG) & 0x7f) - 462 (NCR_700_readl(host, DBC_REG) & 0x7f)) & 0x7f; 463 } else { 464 count = ((NCR_700_readb(host, DFIFO_REG) & 0x3f) - 465 (NCR_700_readl(host, DBC_REG) & 0x3f)) & 0x3f; 466 } 467 468 if(hostdata->fast) 469 synchronous = NCR_700_readb(host, SXFER_REG) & 0x0f; 470 471 /* get the data direction */ 472 ddir = NCR_700_readb(host, CTEST0_REG) & 0x01; 473 474 if (ddir) { 475 /* Receive */ 476 if (synchronous) 477 count += (NCR_700_readb(host, SSTAT2_REG) & 0xf0) >> 4; 478 else 479 if (NCR_700_readb(host, SSTAT1_REG) & SIDL_REG_FULL) 480 ++count; 481 } else { 482 /* Send */ 483 __u8 sstat = NCR_700_readb(host, SSTAT1_REG); 484 if (sstat & SODL_REG_FULL) 485 ++count; 486 if (synchronous && (sstat & SODR_REG_FULL)) 487 ++count; 488 } 489 #ifdef NCR_700_DEBUG 490 if(count) 491 printk("RESIDUAL IS %d (ddir %d)\n", count, ddir); 492 #endif 493 return count; 494 } 495 496 /* print out the SCSI wires and corresponding phase from the SBCL register 497 * in the chip */ 498 static inline char * 499 sbcl_to_string(__u8 sbcl) 500 { 501 int i; 502 static char ret[256]; 503 504 ret[0]='\0'; 505 for(i=0; i<8; i++) { 506 if((1<<i) & sbcl) 507 strcat(ret, NCR_700_SBCL_bits[i]); 508 } 509 strcat(ret, NCR_700_SBCL_to_phase[sbcl & 0x07]); 510 return ret; 511 } 512 513 static inline __u8 514 bitmap_to_number(__u8 bitmap) 515 { 516 __u8 i; 517 518 for(i=0; i<8 && !(bitmap &(1<<i)); i++) 519 ; 520 return i; 521 } 522 523 /* Pull a slot off the free list */ 524 STATIC struct NCR_700_command_slot * 525 find_empty_slot(struct NCR_700_Host_Parameters *hostdata) 526 { 527 struct NCR_700_command_slot *slot = hostdata->free_list; 528 529 if(slot == NULL) { 530 /* sanity check */ 531 if(hostdata->command_slot_count != NCR_700_COMMAND_SLOTS_PER_HOST) 532 printk(KERN_ERR "SLOTS FULL, but count is %d, should be %d\n", hostdata->command_slot_count, NCR_700_COMMAND_SLOTS_PER_HOST); 533 return NULL; 534 } 535 536 if(slot->state != NCR_700_SLOT_FREE) 537 /* should panic! */ 538 printk(KERN_ERR "BUSY SLOT ON FREE LIST!!!\n"); 539 540 541 hostdata->free_list = slot->ITL_forw; 542 slot->ITL_forw = NULL; 543 544 545 /* NOTE: set the state to busy here, not queued, since this 546 * indicates the slot is in use and cannot be run by the IRQ 547 * finish routine. If we cannot queue the command when it 548 * is properly build, we then change to NCR_700_SLOT_QUEUED */ 549 slot->state = NCR_700_SLOT_BUSY; 550 hostdata->command_slot_count++; 551 552 return slot; 553 } 554 555 STATIC void 556 free_slot(struct NCR_700_command_slot *slot, 557 struct NCR_700_Host_Parameters *hostdata) 558 { 559 if((slot->state & NCR_700_SLOT_MASK) != NCR_700_SLOT_MAGIC) { 560 printk(KERN_ERR "53c700: SLOT %p is not MAGIC!!!\n", slot); 561 } 562 if(slot->state == NCR_700_SLOT_FREE) { 563 printk(KERN_ERR "53c700: SLOT %p is FREE!!!\n", slot); 564 } 565 566 slot->resume_offset = 0; 567 slot->cmnd = NULL; 568 slot->state = NCR_700_SLOT_FREE; 569 slot->ITL_forw = hostdata->free_list; 570 hostdata->free_list = slot; 571 hostdata->command_slot_count--; 572 } 573 574 575 /* This routine really does very little. The command is indexed on 576 the ITL and (if tagged) the ITLQ lists in _queuecommand */ 577 STATIC void 578 save_for_reselection(struct NCR_700_Host_Parameters *hostdata, 579 struct scsi_cmnd *SCp, __u32 dsp) 580 { 581 /* Its just possible that this gets executed twice */ 582 if(SCp != NULL) { 583 struct NCR_700_command_slot *slot = 584 (struct NCR_700_command_slot *)SCp->host_scribble; 585 586 slot->resume_offset = dsp; 587 } 588 hostdata->state = NCR_700_HOST_FREE; 589 hostdata->cmd = NULL; 590 } 591 592 STATIC inline void 593 NCR_700_unmap(struct NCR_700_Host_Parameters *hostdata, struct scsi_cmnd *SCp, 594 struct NCR_700_command_slot *slot) 595 { 596 if(SCp->sc_data_direction != DMA_NONE && 597 SCp->sc_data_direction != DMA_BIDIRECTIONAL) { 598 if(SCp->use_sg) { 599 dma_unmap_sg(hostdata->dev, SCp->buffer, 600 SCp->use_sg, SCp->sc_data_direction); 601 } else { 602 dma_unmap_single(hostdata->dev, slot->dma_handle, 603 SCp->request_bufflen, 604 SCp->sc_data_direction); 605 } 606 } 607 } 608 609 STATIC inline void 610 NCR_700_scsi_done(struct NCR_700_Host_Parameters *hostdata, 611 struct scsi_cmnd *SCp, int result) 612 { 613 hostdata->state = NCR_700_HOST_FREE; 614 hostdata->cmd = NULL; 615 616 if(SCp != NULL) { 617 struct NCR_700_command_slot *slot = 618 (struct NCR_700_command_slot *)SCp->host_scribble; 619 620 NCR_700_unmap(hostdata, SCp, slot); 621 dma_unmap_single(hostdata->dev, slot->pCmd, 622 sizeof(SCp->cmnd), DMA_TO_DEVICE); 623 if(SCp->cmnd[0] == REQUEST_SENSE && SCp->cmnd[6] == NCR_700_INTERNAL_SENSE_MAGIC) { 624 #ifdef NCR_700_DEBUG 625 printk(" ORIGINAL CMD %p RETURNED %d, new return is %d sense is\n", 626 SCp, SCp->cmnd[7], result); 627 scsi_print_sense("53c700", SCp); 628 629 #endif 630 /* restore the old result if the request sense was 631 * successful */ 632 if(result == 0) 633 result = SCp->cmnd[7]; 634 /* now restore the original command */ 635 memcpy((void *) SCp->cmnd, (void *) SCp->data_cmnd, 636 sizeof(SCp->data_cmnd)); 637 SCp->request_buffer = SCp->buffer; 638 SCp->request_bufflen = SCp->bufflen; 639 SCp->use_sg = SCp->old_use_sg; 640 SCp->cmd_len = SCp->old_cmd_len; 641 SCp->sc_data_direction = SCp->sc_old_data_direction; 642 SCp->underflow = SCp->old_underflow; 643 644 } 645 free_slot(slot, hostdata); 646 #ifdef NCR_700_DEBUG 647 if(NCR_700_get_depth(SCp->device) == 0 || 648 NCR_700_get_depth(SCp->device) > SCp->device->queue_depth) 649 printk(KERN_ERR "Invalid depth in NCR_700_scsi_done(): %d\n", 650 NCR_700_get_depth(SCp->device)); 651 #endif /* NCR_700_DEBUG */ 652 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) - 1); 653 654 SCp->host_scribble = NULL; 655 SCp->result = result; 656 SCp->scsi_done(SCp); 657 } else { 658 printk(KERN_ERR "53c700: SCSI DONE HAS NULL SCp\n"); 659 } 660 } 661 662 663 STATIC void 664 NCR_700_internal_bus_reset(struct Scsi_Host *host) 665 { 666 /* Bus reset */ 667 NCR_700_writeb(ASSERT_RST, host, SCNTL1_REG); 668 udelay(50); 669 NCR_700_writeb(0, host, SCNTL1_REG); 670 671 } 672 673 STATIC void 674 NCR_700_chip_setup(struct Scsi_Host *host) 675 { 676 struct NCR_700_Host_Parameters *hostdata = 677 (struct NCR_700_Host_Parameters *)host->hostdata[0]; 678 __u32 dcntl_extra = 0; 679 __u8 min_period; 680 __u8 min_xferp = (hostdata->chip710 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP); 681 682 if(hostdata->chip710) { 683 __u8 burst_disable = hostdata->burst_disable 684 ? BURST_DISABLE : 0; 685 dcntl_extra = COMPAT_700_MODE; 686 687 NCR_700_writeb(dcntl_extra, host, DCNTL_REG); 688 NCR_700_writeb(BURST_LENGTH_8 | hostdata->dmode_extra, 689 host, DMODE_710_REG); 690 NCR_700_writeb(burst_disable | (hostdata->differential ? 691 DIFF : 0), host, CTEST7_REG); 692 NCR_700_writeb(BTB_TIMER_DISABLE, host, CTEST0_REG); 693 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY | PARITY 694 | AUTO_ATN, host, SCNTL0_REG); 695 } else { 696 NCR_700_writeb(BURST_LENGTH_8 | hostdata->dmode_extra, 697 host, DMODE_700_REG); 698 NCR_700_writeb(hostdata->differential ? 699 DIFF : 0, host, CTEST7_REG); 700 if(hostdata->fast) { 701 /* this is for 700-66, does nothing on 700 */ 702 NCR_700_writeb(LAST_DIS_ENBL | ENABLE_ACTIVE_NEGATION 703 | GENERATE_RECEIVE_PARITY, host, 704 CTEST8_REG); 705 } else { 706 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY 707 | PARITY | AUTO_ATN, host, SCNTL0_REG); 708 } 709 } 710 711 NCR_700_writeb(1 << host->this_id, host, SCID_REG); 712 NCR_700_writeb(0, host, SBCL_REG); 713 NCR_700_writeb(ASYNC_OPERATION, host, SXFER_REG); 714 715 NCR_700_writeb(PHASE_MM_INT | SEL_TIMEOUT_INT | GROSS_ERR_INT | UX_DISC_INT 716 | RST_INT | PAR_ERR_INT | SELECT_INT, host, SIEN_REG); 717 718 NCR_700_writeb(ABORT_INT | INT_INST_INT | ILGL_INST_INT, host, DIEN_REG); 719 NCR_700_writeb(ENABLE_SELECT, host, SCNTL1_REG); 720 if(hostdata->clock > 75) { 721 printk(KERN_ERR "53c700: Clock speed %dMHz is too high: 75Mhz is the maximum this chip can be driven at\n", hostdata->clock); 722 /* do the best we can, but the async clock will be out 723 * of spec: sync divider 2, async divider 3 */ 724 DEBUG(("53c700: sync 2 async 3\n")); 725 NCR_700_writeb(SYNC_DIV_2_0, host, SBCL_REG); 726 NCR_700_writeb(ASYNC_DIV_3_0 | dcntl_extra, host, DCNTL_REG); 727 hostdata->sync_clock = hostdata->clock/2; 728 } else if(hostdata->clock > 50 && hostdata->clock <= 75) { 729 /* sync divider 1.5, async divider 3 */ 730 DEBUG(("53c700: sync 1.5 async 3\n")); 731 NCR_700_writeb(SYNC_DIV_1_5, host, SBCL_REG); 732 NCR_700_writeb(ASYNC_DIV_3_0 | dcntl_extra, host, DCNTL_REG); 733 hostdata->sync_clock = hostdata->clock*2; 734 hostdata->sync_clock /= 3; 735 736 } else if(hostdata->clock > 37 && hostdata->clock <= 50) { 737 /* sync divider 1, async divider 2 */ 738 DEBUG(("53c700: sync 1 async 2\n")); 739 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG); 740 NCR_700_writeb(ASYNC_DIV_2_0 | dcntl_extra, host, DCNTL_REG); 741 hostdata->sync_clock = hostdata->clock; 742 } else if(hostdata->clock > 25 && hostdata->clock <=37) { 743 /* sync divider 1, async divider 1.5 */ 744 DEBUG(("53c700: sync 1 async 1.5\n")); 745 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG); 746 NCR_700_writeb(ASYNC_DIV_1_5 | dcntl_extra, host, DCNTL_REG); 747 hostdata->sync_clock = hostdata->clock; 748 } else { 749 DEBUG(("53c700: sync 1 async 1\n")); 750 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG); 751 NCR_700_writeb(ASYNC_DIV_1_0 | dcntl_extra, host, DCNTL_REG); 752 /* sync divider 1, async divider 1 */ 753 hostdata->sync_clock = hostdata->clock; 754 } 755 /* Calculate the actual minimum period that can be supported 756 * by our synchronous clock speed. See the 710 manual for 757 * exact details of this calculation which is based on a 758 * setting of the SXFER register */ 759 min_period = 1000*(4+min_xferp)/(4*hostdata->sync_clock); 760 hostdata->min_period = NCR_700_MIN_PERIOD; 761 if(min_period > NCR_700_MIN_PERIOD) 762 hostdata->min_period = min_period; 763 } 764 765 STATIC void 766 NCR_700_chip_reset(struct Scsi_Host *host) 767 { 768 struct NCR_700_Host_Parameters *hostdata = 769 (struct NCR_700_Host_Parameters *)host->hostdata[0]; 770 if(hostdata->chip710) { 771 NCR_700_writeb(SOFTWARE_RESET_710, host, ISTAT_REG); 772 udelay(100); 773 774 NCR_700_writeb(0, host, ISTAT_REG); 775 } else { 776 NCR_700_writeb(SOFTWARE_RESET, host, DCNTL_REG); 777 udelay(100); 778 779 NCR_700_writeb(0, host, DCNTL_REG); 780 } 781 782 mdelay(1000); 783 784 NCR_700_chip_setup(host); 785 } 786 787 /* The heart of the message processing engine is that the instruction 788 * immediately after the INT is the normal case (and so must be CLEAR 789 * ACK). If we want to do something else, we call that routine in 790 * scripts and set temp to be the normal case + 8 (skipping the CLEAR 791 * ACK) so that the routine returns correctly to resume its activity 792 * */ 793 STATIC __u32 794 process_extended_message(struct Scsi_Host *host, 795 struct NCR_700_Host_Parameters *hostdata, 796 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps) 797 { 798 __u32 resume_offset = dsp, temp = dsp + 8; 799 __u8 pun = 0xff, lun = 0xff; 800 801 if(SCp != NULL) { 802 pun = SCp->device->id; 803 lun = SCp->device->lun; 804 } 805 806 switch(hostdata->msgin[2]) { 807 case A_SDTR_MSG: 808 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) { 809 struct scsi_target *starget = SCp->device->sdev_target; 810 __u8 period = hostdata->msgin[3]; 811 __u8 offset = hostdata->msgin[4]; 812 813 if(offset == 0 || period == 0) { 814 offset = 0; 815 period = 0; 816 } 817 818 spi_offset(starget) = offset; 819 spi_period(starget) = period; 820 821 if(NCR_700_is_flag_set(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION)) { 822 spi_display_xfer_agreement(starget); 823 NCR_700_clear_flag(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION); 824 } 825 826 NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC); 827 NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION); 828 829 NCR_700_writeb(NCR_700_get_SXFER(SCp->device), 830 host, SXFER_REG); 831 832 } else { 833 /* SDTR message out of the blue, reject it */ 834 printk(KERN_WARNING "scsi%d Unexpected SDTR msg\n", 835 host->host_no); 836 hostdata->msgout[0] = A_REJECT_MSG; 837 dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE); 838 script_patch_16(hostdata->script, MessageCount, 1); 839 /* SendMsgOut returns, so set up the return 840 * address */ 841 resume_offset = hostdata->pScript + Ent_SendMessageWithATN; 842 } 843 break; 844 845 case A_WDTR_MSG: 846 printk(KERN_INFO "scsi%d: (%d:%d), Unsolicited WDTR after CMD, Rejecting\n", 847 host->host_no, pun, lun); 848 hostdata->msgout[0] = A_REJECT_MSG; 849 dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE); 850 script_patch_16(hostdata->script, MessageCount, 1); 851 resume_offset = hostdata->pScript + Ent_SendMessageWithATN; 852 853 break; 854 855 default: 856 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ", 857 host->host_no, pun, lun, 858 NCR_700_phase[(dsps & 0xf00) >> 8]); 859 scsi_print_msg(hostdata->msgin); 860 printk("\n"); 861 /* just reject it */ 862 hostdata->msgout[0] = A_REJECT_MSG; 863 dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE); 864 script_patch_16(hostdata->script, MessageCount, 1); 865 /* SendMsgOut returns, so set up the return 866 * address */ 867 resume_offset = hostdata->pScript + Ent_SendMessageWithATN; 868 } 869 NCR_700_writel(temp, host, TEMP_REG); 870 return resume_offset; 871 } 872 873 STATIC __u32 874 process_message(struct Scsi_Host *host, struct NCR_700_Host_Parameters *hostdata, 875 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps) 876 { 877 /* work out where to return to */ 878 __u32 temp = dsp + 8, resume_offset = dsp; 879 __u8 pun = 0xff, lun = 0xff; 880 881 if(SCp != NULL) { 882 pun = SCp->device->id; 883 lun = SCp->device->lun; 884 } 885 886 #ifdef NCR_700_DEBUG 887 printk("scsi%d (%d:%d): message %s: ", host->host_no, pun, lun, 888 NCR_700_phase[(dsps & 0xf00) >> 8]); 889 scsi_print_msg(hostdata->msgin); 890 printk("\n"); 891 #endif 892 893 switch(hostdata->msgin[0]) { 894 895 case A_EXTENDED_MSG: 896 resume_offset = process_extended_message(host, hostdata, SCp, 897 dsp, dsps); 898 break; 899 900 case A_REJECT_MSG: 901 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) { 902 /* Rejected our sync negotiation attempt */ 903 spi_period(SCp->device->sdev_target) = 904 spi_offset(SCp->device->sdev_target) = 0; 905 NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC); 906 NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION); 907 } else if(SCp != NULL && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION) { 908 /* rejected our first simple tag message */ 909 printk(KERN_WARNING "scsi%d (%d:%d) Rejected first tag queue attempt, turning off tag queueing\n", host->host_no, pun, lun); 910 /* we're done negotiating */ 911 NCR_700_set_tag_neg_state(SCp->device, NCR_700_FINISHED_TAG_NEGOTIATION); 912 hostdata->tag_negotiated &= ~(1<<SCp->device->id); 913 SCp->device->tagged_supported = 0; 914 scsi_deactivate_tcq(SCp->device, host->cmd_per_lun); 915 } else { 916 printk(KERN_WARNING "scsi%d (%d:%d) Unexpected REJECT Message %s\n", 917 host->host_no, pun, lun, 918 NCR_700_phase[(dsps & 0xf00) >> 8]); 919 /* however, just ignore it */ 920 } 921 break; 922 923 case A_PARITY_ERROR_MSG: 924 printk(KERN_ERR "scsi%d (%d:%d) Parity Error!\n", host->host_no, 925 pun, lun); 926 NCR_700_internal_bus_reset(host); 927 break; 928 case A_SIMPLE_TAG_MSG: 929 printk(KERN_INFO "scsi%d (%d:%d) SIMPLE TAG %d %s\n", host->host_no, 930 pun, lun, hostdata->msgin[1], 931 NCR_700_phase[(dsps & 0xf00) >> 8]); 932 /* just ignore it */ 933 break; 934 default: 935 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ", 936 host->host_no, pun, lun, 937 NCR_700_phase[(dsps & 0xf00) >> 8]); 938 939 scsi_print_msg(hostdata->msgin); 940 printk("\n"); 941 /* just reject it */ 942 hostdata->msgout[0] = A_REJECT_MSG; 943 dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE); 944 script_patch_16(hostdata->script, MessageCount, 1); 945 /* SendMsgOut returns, so set up the return 946 * address */ 947 resume_offset = hostdata->pScript + Ent_SendMessageWithATN; 948 949 break; 950 } 951 NCR_700_writel(temp, host, TEMP_REG); 952 /* set us up to receive another message */ 953 dma_cache_sync(hostdata->msgin, MSG_ARRAY_SIZE, DMA_FROM_DEVICE); 954 return resume_offset; 955 } 956 957 STATIC __u32 958 process_script_interrupt(__u32 dsps, __u32 dsp, struct scsi_cmnd *SCp, 959 struct Scsi_Host *host, 960 struct NCR_700_Host_Parameters *hostdata) 961 { 962 __u32 resume_offset = 0; 963 __u8 pun = 0xff, lun=0xff; 964 965 if(SCp != NULL) { 966 pun = SCp->device->id; 967 lun = SCp->device->lun; 968 } 969 970 if(dsps == A_GOOD_STATUS_AFTER_STATUS) { 971 DEBUG((" COMMAND COMPLETE, status=%02x\n", 972 hostdata->status[0])); 973 /* OK, if TCQ still under negotiation, we now know it works */ 974 if (NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION) 975 NCR_700_set_tag_neg_state(SCp->device, 976 NCR_700_FINISHED_TAG_NEGOTIATION); 977 978 /* check for contingent allegiance contitions */ 979 if(status_byte(hostdata->status[0]) == CHECK_CONDITION || 980 status_byte(hostdata->status[0]) == COMMAND_TERMINATED) { 981 struct NCR_700_command_slot *slot = 982 (struct NCR_700_command_slot *)SCp->host_scribble; 983 if(SCp->cmnd[0] == REQUEST_SENSE) { 984 /* OOPS: bad device, returning another 985 * contingent allegiance condition */ 986 printk(KERN_ERR "scsi%d (%d:%d) broken device is looping in contingent allegiance: ignoring\n", host->host_no, pun, lun); 987 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]); 988 } else { 989 #ifdef NCR_DEBUG 990 scsi_print_command(SCp); 991 printk(" cmd %p has status %d, requesting sense\n", 992 SCp, hostdata->status[0]); 993 #endif 994 /* we can destroy the command here 995 * because the contingent allegiance 996 * condition will cause a retry which 997 * will re-copy the command from the 998 * saved data_cmnd. We also unmap any 999 * data associated with the command 1000 * here */ 1001 NCR_700_unmap(hostdata, SCp, slot); 1002 1003 SCp->cmnd[0] = REQUEST_SENSE; 1004 SCp->cmnd[1] = (SCp->device->lun & 0x7) << 5; 1005 SCp->cmnd[2] = 0; 1006 SCp->cmnd[3] = 0; 1007 SCp->cmnd[4] = sizeof(SCp->sense_buffer); 1008 SCp->cmnd[5] = 0; 1009 SCp->cmd_len = 6; 1010 /* Here's a quiet hack: the 1011 * REQUEST_SENSE command is six bytes, 1012 * so store a flag indicating that 1013 * this was an internal sense request 1014 * and the original status at the end 1015 * of the command */ 1016 SCp->cmnd[6] = NCR_700_INTERNAL_SENSE_MAGIC; 1017 SCp->cmnd[7] = hostdata->status[0]; 1018 SCp->use_sg = 0; 1019 SCp->sc_data_direction = DMA_FROM_DEVICE; 1020 dma_sync_single_for_device(hostdata->dev, slot->pCmd, 1021 SCp->cmd_len, DMA_TO_DEVICE); 1022 SCp->request_bufflen = sizeof(SCp->sense_buffer); 1023 slot->dma_handle = dma_map_single(hostdata->dev, SCp->sense_buffer, sizeof(SCp->sense_buffer), DMA_FROM_DEVICE); 1024 slot->SG[0].ins = bS_to_host(SCRIPT_MOVE_DATA_IN | sizeof(SCp->sense_buffer)); 1025 slot->SG[0].pAddr = bS_to_host(slot->dma_handle); 1026 slot->SG[1].ins = bS_to_host(SCRIPT_RETURN); 1027 slot->SG[1].pAddr = 0; 1028 slot->resume_offset = hostdata->pScript; 1029 dma_cache_sync(slot->SG, sizeof(slot->SG[0])*2, DMA_TO_DEVICE); 1030 dma_cache_sync(SCp->sense_buffer, sizeof(SCp->sense_buffer), DMA_FROM_DEVICE); 1031 1032 /* queue the command for reissue */ 1033 slot->state = NCR_700_SLOT_QUEUED; 1034 hostdata->state = NCR_700_HOST_FREE; 1035 hostdata->cmd = NULL; 1036 } 1037 } else { 1038 // Currently rely on the mid layer evaluation 1039 // of the tag queuing capability 1040 // 1041 //if(status_byte(hostdata->status[0]) == GOOD && 1042 // SCp->cmnd[0] == INQUIRY && SCp->use_sg == 0) { 1043 // /* Piggy back the tag queueing support 1044 // * on this command */ 1045 // dma_sync_single_for_cpu(hostdata->dev, 1046 // slot->dma_handle, 1047 // SCp->request_bufflen, 1048 // DMA_FROM_DEVICE); 1049 // if(((char *)SCp->request_buffer)[7] & 0x02) { 1050 // printk(KERN_INFO "scsi%d: (%d:%d) Enabling Tag Command Queuing\n", host->host_no, pun, lun); 1051 // hostdata->tag_negotiated |= (1<<SCp->device->id); 1052 // NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING); 1053 // } else { 1054 // NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING); 1055 // hostdata->tag_negotiated &= ~(1<<SCp->device->id); 1056 // } 1057 //} 1058 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]); 1059 } 1060 } else if((dsps & 0xfffff0f0) == A_UNEXPECTED_PHASE) { 1061 __u8 i = (dsps & 0xf00) >> 8; 1062 1063 printk(KERN_ERR "scsi%d: (%d:%d), UNEXPECTED PHASE %s (%s)\n", 1064 host->host_no, pun, lun, 1065 NCR_700_phase[i], 1066 sbcl_to_string(NCR_700_readb(host, SBCL_REG))); 1067 printk(KERN_ERR " len = %d, cmd =", SCp->cmd_len); 1068 scsi_print_command(SCp); 1069 1070 NCR_700_internal_bus_reset(host); 1071 } else if((dsps & 0xfffff000) == A_FATAL) { 1072 int i = (dsps & 0xfff); 1073 1074 printk(KERN_ERR "scsi%d: (%d:%d) FATAL ERROR: %s\n", 1075 host->host_no, pun, lun, NCR_700_fatal_messages[i]); 1076 if(dsps == A_FATAL_ILLEGAL_MSG_LENGTH) { 1077 printk(KERN_ERR " msg begins %02x %02x\n", 1078 hostdata->msgin[0], hostdata->msgin[1]); 1079 } 1080 NCR_700_internal_bus_reset(host); 1081 } else if((dsps & 0xfffff0f0) == A_DISCONNECT) { 1082 #ifdef NCR_700_DEBUG 1083 __u8 i = (dsps & 0xf00) >> 8; 1084 1085 printk("scsi%d: (%d:%d), DISCONNECTED (%d) %s\n", 1086 host->host_no, pun, lun, 1087 i, NCR_700_phase[i]); 1088 #endif 1089 save_for_reselection(hostdata, SCp, dsp); 1090 1091 } else if(dsps == A_RESELECTION_IDENTIFIED) { 1092 __u8 lun; 1093 struct NCR_700_command_slot *slot; 1094 __u8 reselection_id = hostdata->reselection_id; 1095 struct scsi_device *SDp; 1096 1097 lun = hostdata->msgin[0] & 0x1f; 1098 1099 hostdata->reselection_id = 0xff; 1100 DEBUG(("scsi%d: (%d:%d) RESELECTED!\n", 1101 host->host_no, reselection_id, lun)); 1102 /* clear the reselection indicator */ 1103 SDp = __scsi_device_lookup(host, 0, reselection_id, lun); 1104 if(unlikely(SDp == NULL)) { 1105 printk(KERN_ERR "scsi%d: (%d:%d) HAS NO device\n", 1106 host->host_no, reselection_id, lun); 1107 BUG(); 1108 } 1109 if(hostdata->msgin[1] == A_SIMPLE_TAG_MSG) { 1110 struct scsi_cmnd *SCp = scsi_find_tag(SDp, hostdata->msgin[2]); 1111 if(unlikely(SCp == NULL)) { 1112 printk(KERN_ERR "scsi%d: (%d:%d) no saved request for tag %d\n", 1113 host->host_no, reselection_id, lun, hostdata->msgin[2]); 1114 BUG(); 1115 } 1116 1117 slot = (struct NCR_700_command_slot *)SCp->host_scribble; 1118 DEBUG(("53c700: %d:%d:%d, reselection is tag %d, slot %p(%d)\n", 1119 host->host_no, SDp->id, SDp->lun, 1120 hostdata->msgin[2], slot, slot->tag)); 1121 } else { 1122 struct scsi_cmnd *SCp = scsi_find_tag(SDp, SCSI_NO_TAG); 1123 if(unlikely(SCp == NULL)) { 1124 printk(KERN_ERR "scsi%d: (%d:%d) no saved request for untagged cmd\n", 1125 host->host_no, reselection_id, lun); 1126 BUG(); 1127 } 1128 slot = (struct NCR_700_command_slot *)SCp->host_scribble; 1129 } 1130 1131 if(slot == NULL) { 1132 printk(KERN_ERR "scsi%d: (%d:%d) RESELECTED but no saved command (MSG = %02x %02x %02x)!!\n", 1133 host->host_no, reselection_id, lun, 1134 hostdata->msgin[0], hostdata->msgin[1], 1135 hostdata->msgin[2]); 1136 } else { 1137 if(hostdata->state != NCR_700_HOST_BUSY) 1138 printk(KERN_ERR "scsi%d: FATAL, host not busy during valid reselection!\n", 1139 host->host_no); 1140 resume_offset = slot->resume_offset; 1141 hostdata->cmd = slot->cmnd; 1142 1143 /* re-patch for this command */ 1144 script_patch_32_abs(hostdata->script, CommandAddress, 1145 slot->pCmd); 1146 script_patch_16(hostdata->script, 1147 CommandCount, slot->cmnd->cmd_len); 1148 script_patch_32_abs(hostdata->script, SGScriptStartAddress, 1149 to32bit(&slot->pSG[0].ins)); 1150 1151 /* Note: setting SXFER only works if we're 1152 * still in the MESSAGE phase, so it is vital 1153 * that ACK is still asserted when we process 1154 * the reselection message. The resume offset 1155 * should therefore always clear ACK */ 1156 NCR_700_writeb(NCR_700_get_SXFER(hostdata->cmd->device), 1157 host, SXFER_REG); 1158 dma_cache_sync(hostdata->msgin, 1159 MSG_ARRAY_SIZE, DMA_FROM_DEVICE); 1160 dma_cache_sync(hostdata->msgout, 1161 MSG_ARRAY_SIZE, DMA_TO_DEVICE); 1162 /* I'm just being paranoid here, the command should 1163 * already have been flushed from the cache */ 1164 dma_cache_sync(slot->cmnd->cmnd, 1165 slot->cmnd->cmd_len, DMA_TO_DEVICE); 1166 1167 1168 1169 } 1170 } else if(dsps == A_RESELECTED_DURING_SELECTION) { 1171 1172 /* This section is full of debugging code because I've 1173 * never managed to reach it. I think what happens is 1174 * that, because the 700 runs with selection 1175 * interrupts enabled the whole time that we take a 1176 * selection interrupt before we manage to get to the 1177 * reselected script interrupt */ 1178 1179 __u8 reselection_id = NCR_700_readb(host, SFBR_REG); 1180 struct NCR_700_command_slot *slot; 1181 1182 /* Take out our own ID */ 1183 reselection_id &= ~(1<<host->this_id); 1184 1185 /* I've never seen this happen, so keep this as a printk rather 1186 * than a debug */ 1187 printk(KERN_INFO "scsi%d: (%d:%d) RESELECTION DURING SELECTION, dsp=%08x[%04x] state=%d, count=%d\n", 1188 host->host_no, reselection_id, lun, dsp, dsp - hostdata->pScript, hostdata->state, hostdata->command_slot_count); 1189 1190 { 1191 /* FIXME: DEBUGGING CODE */ 1192 __u32 SG = (__u32)bS_to_cpu(hostdata->script[A_SGScriptStartAddress_used[0]]); 1193 int i; 1194 1195 for(i=0; i< NCR_700_COMMAND_SLOTS_PER_HOST; i++) { 1196 if(SG >= to32bit(&hostdata->slots[i].pSG[0]) 1197 && SG <= to32bit(&hostdata->slots[i].pSG[NCR_700_SG_SEGMENTS])) 1198 break; 1199 } 1200 printk(KERN_INFO "IDENTIFIED SG segment as being %08x in slot %p, cmd %p, slot->resume_offset=%08x\n", SG, &hostdata->slots[i], hostdata->slots[i].cmnd, hostdata->slots[i].resume_offset); 1201 SCp = hostdata->slots[i].cmnd; 1202 } 1203 1204 if(SCp != NULL) { 1205 slot = (struct NCR_700_command_slot *)SCp->host_scribble; 1206 /* change slot from busy to queued to redo command */ 1207 slot->state = NCR_700_SLOT_QUEUED; 1208 } 1209 hostdata->cmd = NULL; 1210 1211 if(reselection_id == 0) { 1212 if(hostdata->reselection_id == 0xff) { 1213 printk(KERN_ERR "scsi%d: Invalid reselection during selection!!\n", host->host_no); 1214 return 0; 1215 } else { 1216 printk(KERN_ERR "scsi%d: script reselected and we took a selection interrupt\n", 1217 host->host_no); 1218 reselection_id = hostdata->reselection_id; 1219 } 1220 } else { 1221 1222 /* convert to real ID */ 1223 reselection_id = bitmap_to_number(reselection_id); 1224 } 1225 hostdata->reselection_id = reselection_id; 1226 /* just in case we have a stale simple tag message, clear it */ 1227 hostdata->msgin[1] = 0; 1228 dma_cache_sync(hostdata->msgin, 1229 MSG_ARRAY_SIZE, DMA_BIDIRECTIONAL); 1230 if(hostdata->tag_negotiated & (1<<reselection_id)) { 1231 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag; 1232 } else { 1233 resume_offset = hostdata->pScript + Ent_GetReselectionData; 1234 } 1235 } else if(dsps == A_COMPLETED_SELECTION_AS_TARGET) { 1236 /* we've just disconnected from the bus, do nothing since 1237 * a return here will re-run the queued command slot 1238 * that may have been interrupted by the initial selection */ 1239 DEBUG((" SELECTION COMPLETED\n")); 1240 } else if((dsps & 0xfffff0f0) == A_MSG_IN) { 1241 resume_offset = process_message(host, hostdata, SCp, 1242 dsp, dsps); 1243 } else if((dsps & 0xfffff000) == 0) { 1244 __u8 i = (dsps & 0xf0) >> 4, j = (dsps & 0xf00) >> 8; 1245 printk(KERN_ERR "scsi%d: (%d:%d), unhandled script condition %s %s at %04x\n", 1246 host->host_no, pun, lun, NCR_700_condition[i], 1247 NCR_700_phase[j], dsp - hostdata->pScript); 1248 if(SCp != NULL) { 1249 scsi_print_command(SCp); 1250 1251 if(SCp->use_sg) { 1252 for(i = 0; i < SCp->use_sg + 1; i++) { 1253 printk(KERN_INFO " SG[%d].length = %d, move_insn=%08x, addr %08x\n", i, ((struct scatterlist *)SCp->buffer)[i].length, ((struct NCR_700_command_slot *)SCp->host_scribble)->SG[i].ins, ((struct NCR_700_command_slot *)SCp->host_scribble)->SG[i].pAddr); 1254 } 1255 } 1256 } 1257 NCR_700_internal_bus_reset(host); 1258 } else if((dsps & 0xfffff000) == A_DEBUG_INTERRUPT) { 1259 printk(KERN_NOTICE "scsi%d (%d:%d) DEBUG INTERRUPT %d AT %08x[%04x], continuing\n", 1260 host->host_no, pun, lun, dsps & 0xfff, dsp, dsp - hostdata->pScript); 1261 resume_offset = dsp; 1262 } else { 1263 printk(KERN_ERR "scsi%d: (%d:%d), unidentified script interrupt 0x%x at %04x\n", 1264 host->host_no, pun, lun, dsps, dsp - hostdata->pScript); 1265 NCR_700_internal_bus_reset(host); 1266 } 1267 return resume_offset; 1268 } 1269 1270 /* We run the 53c700 with selection interrupts always enabled. This 1271 * means that the chip may be selected as soon as the bus frees. On a 1272 * busy bus, this can be before the scripts engine finishes its 1273 * processing. Therefore, part of the selection processing has to be 1274 * to find out what the scripts engine is doing and complete the 1275 * function if necessary (i.e. process the pending disconnect or save 1276 * the interrupted initial selection */ 1277 STATIC inline __u32 1278 process_selection(struct Scsi_Host *host, __u32 dsp) 1279 { 1280 __u8 id = 0; /* Squash compiler warning */ 1281 int count = 0; 1282 __u32 resume_offset = 0; 1283 struct NCR_700_Host_Parameters *hostdata = 1284 (struct NCR_700_Host_Parameters *)host->hostdata[0]; 1285 struct scsi_cmnd *SCp = hostdata->cmd; 1286 __u8 sbcl; 1287 1288 for(count = 0; count < 5; count++) { 1289 id = NCR_700_readb(host, hostdata->chip710 ? 1290 CTEST9_REG : SFBR_REG); 1291 1292 /* Take out our own ID */ 1293 id &= ~(1<<host->this_id); 1294 if(id != 0) 1295 break; 1296 udelay(5); 1297 } 1298 sbcl = NCR_700_readb(host, SBCL_REG); 1299 if((sbcl & SBCL_IO) == 0) { 1300 /* mark as having been selected rather than reselected */ 1301 id = 0xff; 1302 } else { 1303 /* convert to real ID */ 1304 hostdata->reselection_id = id = bitmap_to_number(id); 1305 DEBUG(("scsi%d: Reselected by %d\n", 1306 host->host_no, id)); 1307 } 1308 if(hostdata->state == NCR_700_HOST_BUSY && SCp != NULL) { 1309 struct NCR_700_command_slot *slot = 1310 (struct NCR_700_command_slot *)SCp->host_scribble; 1311 DEBUG((" ID %d WARNING: RESELECTION OF BUSY HOST, saving cmd %p, slot %p, addr %x [%04x], resume %x!\n", id, hostdata->cmd, slot, dsp, dsp - hostdata->pScript, resume_offset)); 1312 1313 switch(dsp - hostdata->pScript) { 1314 case Ent_Disconnect1: 1315 case Ent_Disconnect2: 1316 save_for_reselection(hostdata, SCp, Ent_Disconnect2 + hostdata->pScript); 1317 break; 1318 case Ent_Disconnect3: 1319 case Ent_Disconnect4: 1320 save_for_reselection(hostdata, SCp, Ent_Disconnect4 + hostdata->pScript); 1321 break; 1322 case Ent_Disconnect5: 1323 case Ent_Disconnect6: 1324 save_for_reselection(hostdata, SCp, Ent_Disconnect6 + hostdata->pScript); 1325 break; 1326 case Ent_Disconnect7: 1327 case Ent_Disconnect8: 1328 save_for_reselection(hostdata, SCp, Ent_Disconnect8 + hostdata->pScript); 1329 break; 1330 case Ent_Finish1: 1331 case Ent_Finish2: 1332 process_script_interrupt(A_GOOD_STATUS_AFTER_STATUS, dsp, SCp, host, hostdata); 1333 break; 1334 1335 default: 1336 slot->state = NCR_700_SLOT_QUEUED; 1337 break; 1338 } 1339 } 1340 hostdata->state = NCR_700_HOST_BUSY; 1341 hostdata->cmd = NULL; 1342 /* clear any stale simple tag message */ 1343 hostdata->msgin[1] = 0; 1344 dma_cache_sync(hostdata->msgin, MSG_ARRAY_SIZE, 1345 DMA_BIDIRECTIONAL); 1346 1347 if(id == 0xff) { 1348 /* Selected as target, Ignore */ 1349 resume_offset = hostdata->pScript + Ent_SelectedAsTarget; 1350 } else if(hostdata->tag_negotiated & (1<<id)) { 1351 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag; 1352 } else { 1353 resume_offset = hostdata->pScript + Ent_GetReselectionData; 1354 } 1355 return resume_offset; 1356 } 1357 1358 static inline void 1359 NCR_700_clear_fifo(struct Scsi_Host *host) { 1360 const struct NCR_700_Host_Parameters *hostdata 1361 = (struct NCR_700_Host_Parameters *)host->hostdata[0]; 1362 if(hostdata->chip710) { 1363 NCR_700_writeb(CLR_FIFO_710, host, CTEST8_REG); 1364 } else { 1365 NCR_700_writeb(CLR_FIFO, host, DFIFO_REG); 1366 } 1367 } 1368 1369 static inline void 1370 NCR_700_flush_fifo(struct Scsi_Host *host) { 1371 const struct NCR_700_Host_Parameters *hostdata 1372 = (struct NCR_700_Host_Parameters *)host->hostdata[0]; 1373 if(hostdata->chip710) { 1374 NCR_700_writeb(FLUSH_DMA_FIFO_710, host, CTEST8_REG); 1375 udelay(10); 1376 NCR_700_writeb(0, host, CTEST8_REG); 1377 } else { 1378 NCR_700_writeb(FLUSH_DMA_FIFO, host, DFIFO_REG); 1379 udelay(10); 1380 NCR_700_writeb(0, host, DFIFO_REG); 1381 } 1382 } 1383 1384 1385 /* The queue lock with interrupts disabled must be held on entry to 1386 * this function */ 1387 STATIC int 1388 NCR_700_start_command(struct scsi_cmnd *SCp) 1389 { 1390 struct NCR_700_command_slot *slot = 1391 (struct NCR_700_command_slot *)SCp->host_scribble; 1392 struct NCR_700_Host_Parameters *hostdata = 1393 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0]; 1394 __u16 count = 1; /* for IDENTIFY message */ 1395 1396 if(hostdata->state != NCR_700_HOST_FREE) { 1397 /* keep this inside the lock to close the race window where 1398 * the running command finishes on another CPU while we don't 1399 * change the state to queued on this one */ 1400 slot->state = NCR_700_SLOT_QUEUED; 1401 1402 DEBUG(("scsi%d: host busy, queueing command %p, slot %p\n", 1403 SCp->device->host->host_no, slot->cmnd, slot)); 1404 return 0; 1405 } 1406 hostdata->state = NCR_700_HOST_BUSY; 1407 hostdata->cmd = SCp; 1408 slot->state = NCR_700_SLOT_BUSY; 1409 /* keep interrupts disabled until we have the command correctly 1410 * set up so we cannot take a selection interrupt */ 1411 1412 hostdata->msgout[0] = NCR_700_identify(SCp->cmnd[0] != REQUEST_SENSE, 1413 SCp->device->lun); 1414 /* for INQUIRY or REQUEST_SENSE commands, we cannot be sure 1415 * if the negotiated transfer parameters still hold, so 1416 * always renegotiate them */ 1417 if(SCp->cmnd[0] == INQUIRY || SCp->cmnd[0] == REQUEST_SENSE) { 1418 NCR_700_clear_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC); 1419 } 1420 1421 /* REQUEST_SENSE is asking for contingent I_T_L(_Q) status. 1422 * If a contingent allegiance condition exists, the device 1423 * will refuse all tags, so send the request sense as untagged 1424 * */ 1425 if((hostdata->tag_negotiated & (1<<SCp->device->id)) 1426 && (slot->tag != SCSI_NO_TAG && SCp->cmnd[0] != REQUEST_SENSE)) { 1427 count += scsi_populate_tag_msg(SCp, &hostdata->msgout[count]); 1428 } 1429 1430 if(hostdata->fast && 1431 NCR_700_is_flag_clear(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC)) { 1432 memcpy(&hostdata->msgout[count], NCR_700_SDTR_msg, 1433 sizeof(NCR_700_SDTR_msg)); 1434 hostdata->msgout[count+3] = spi_period(SCp->device->sdev_target); 1435 hostdata->msgout[count+4] = spi_offset(SCp->device->sdev_target); 1436 count += sizeof(NCR_700_SDTR_msg); 1437 NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION); 1438 } 1439 1440 script_patch_16(hostdata->script, MessageCount, count); 1441 1442 1443 script_patch_ID(hostdata->script, 1444 Device_ID, 1<<SCp->device->id); 1445 1446 script_patch_32_abs(hostdata->script, CommandAddress, 1447 slot->pCmd); 1448 script_patch_16(hostdata->script, CommandCount, SCp->cmd_len); 1449 /* finally plumb the beginning of the SG list into the script 1450 * */ 1451 script_patch_32_abs(hostdata->script, SGScriptStartAddress, 1452 to32bit(&slot->pSG[0].ins)); 1453 NCR_700_clear_fifo(SCp->device->host); 1454 1455 if(slot->resume_offset == 0) 1456 slot->resume_offset = hostdata->pScript; 1457 /* now perform all the writebacks and invalidates */ 1458 dma_cache_sync(hostdata->msgout, count, DMA_TO_DEVICE); 1459 dma_cache_sync(hostdata->msgin, MSG_ARRAY_SIZE, 1460 DMA_FROM_DEVICE); 1461 dma_cache_sync(SCp->cmnd, SCp->cmd_len, DMA_TO_DEVICE); 1462 dma_cache_sync(hostdata->status, 1, DMA_FROM_DEVICE); 1463 1464 /* set the synchronous period/offset */ 1465 NCR_700_writeb(NCR_700_get_SXFER(SCp->device), 1466 SCp->device->host, SXFER_REG); 1467 NCR_700_writel(slot->temp, SCp->device->host, TEMP_REG); 1468 NCR_700_writel(slot->resume_offset, SCp->device->host, DSP_REG); 1469 1470 return 1; 1471 } 1472 1473 irqreturn_t 1474 NCR_700_intr(int irq, void *dev_id, struct pt_regs *regs) 1475 { 1476 struct Scsi_Host *host = (struct Scsi_Host *)dev_id; 1477 struct NCR_700_Host_Parameters *hostdata = 1478 (struct NCR_700_Host_Parameters *)host->hostdata[0]; 1479 __u8 istat; 1480 __u32 resume_offset = 0; 1481 __u8 pun = 0xff, lun = 0xff; 1482 unsigned long flags; 1483 int handled = 0; 1484 1485 /* Use the host lock to serialise acess to the 53c700 1486 * hardware. Note: In future, we may need to take the queue 1487 * lock to enter the done routines. When that happens, we 1488 * need to ensure that for this driver, the host lock and the 1489 * queue lock point to the same thing. */ 1490 spin_lock_irqsave(host->host_lock, flags); 1491 if((istat = NCR_700_readb(host, ISTAT_REG)) 1492 & (SCSI_INT_PENDING | DMA_INT_PENDING)) { 1493 __u32 dsps; 1494 __u8 sstat0 = 0, dstat = 0; 1495 __u32 dsp; 1496 struct scsi_cmnd *SCp = hostdata->cmd; 1497 enum NCR_700_Host_State state; 1498 1499 handled = 1; 1500 state = hostdata->state; 1501 SCp = hostdata->cmd; 1502 1503 if(istat & SCSI_INT_PENDING) { 1504 udelay(10); 1505 1506 sstat0 = NCR_700_readb(host, SSTAT0_REG); 1507 } 1508 1509 if(istat & DMA_INT_PENDING) { 1510 udelay(10); 1511 1512 dstat = NCR_700_readb(host, DSTAT_REG); 1513 } 1514 1515 dsps = NCR_700_readl(host, DSPS_REG); 1516 dsp = NCR_700_readl(host, DSP_REG); 1517 1518 DEBUG(("scsi%d: istat %02x sstat0 %02x dstat %02x dsp %04x[%08x] dsps 0x%x\n", 1519 host->host_no, istat, sstat0, dstat, 1520 (dsp - (__u32)(hostdata->pScript))/4, 1521 dsp, dsps)); 1522 1523 if(SCp != NULL) { 1524 pun = SCp->device->id; 1525 lun = SCp->device->lun; 1526 } 1527 1528 if(sstat0 & SCSI_RESET_DETECTED) { 1529 struct scsi_device *SDp; 1530 int i; 1531 1532 hostdata->state = NCR_700_HOST_BUSY; 1533 1534 printk(KERN_ERR "scsi%d: Bus Reset detected, executing command %p, slot %p, dsp %08x[%04x]\n", 1535 host->host_no, SCp, SCp == NULL ? NULL : SCp->host_scribble, dsp, dsp - hostdata->pScript); 1536 1537 scsi_report_bus_reset(host, 0); 1538 1539 /* clear all the negotiated parameters */ 1540 __shost_for_each_device(SDp, host) 1541 SDp->hostdata = NULL; 1542 1543 /* clear all the slots and their pending commands */ 1544 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) { 1545 struct scsi_cmnd *SCp; 1546 struct NCR_700_command_slot *slot = 1547 &hostdata->slots[i]; 1548 1549 if(slot->state == NCR_700_SLOT_FREE) 1550 continue; 1551 1552 SCp = slot->cmnd; 1553 printk(KERN_ERR " failing command because of reset, slot %p, cmnd %p\n", 1554 slot, SCp); 1555 free_slot(slot, hostdata); 1556 SCp->host_scribble = NULL; 1557 NCR_700_set_depth(SCp->device, 0); 1558 /* NOTE: deadlock potential here: we 1559 * rely on mid-layer guarantees that 1560 * scsi_done won't try to issue the 1561 * command again otherwise we'll 1562 * deadlock on the 1563 * hostdata->state_lock */ 1564 SCp->result = DID_RESET << 16; 1565 SCp->scsi_done(SCp); 1566 } 1567 mdelay(25); 1568 NCR_700_chip_setup(host); 1569 1570 hostdata->state = NCR_700_HOST_FREE; 1571 hostdata->cmd = NULL; 1572 /* signal back if this was an eh induced reset */ 1573 if(hostdata->eh_complete != NULL) 1574 complete(hostdata->eh_complete); 1575 goto out_unlock; 1576 } else if(sstat0 & SELECTION_TIMEOUT) { 1577 DEBUG(("scsi%d: (%d:%d) selection timeout\n", 1578 host->host_no, pun, lun)); 1579 NCR_700_scsi_done(hostdata, SCp, DID_NO_CONNECT<<16); 1580 } else if(sstat0 & PHASE_MISMATCH) { 1581 struct NCR_700_command_slot *slot = (SCp == NULL) ? NULL : 1582 (struct NCR_700_command_slot *)SCp->host_scribble; 1583 1584 if(dsp == Ent_SendMessage + 8 + hostdata->pScript) { 1585 /* It wants to reply to some part of 1586 * our message */ 1587 #ifdef NCR_700_DEBUG 1588 __u32 temp = NCR_700_readl(host, TEMP_REG); 1589 int count = (hostdata->script[Ent_SendMessage/4] & 0xffffff) - ((NCR_700_readl(host, DBC_REG) & 0xffffff) + NCR_700_data_residual(host)); 1590 printk("scsi%d (%d:%d) PHASE MISMATCH IN SEND MESSAGE %d remain, return %p[%04x], phase %s\n", host->host_no, pun, lun, count, (void *)temp, temp - hostdata->pScript, sbcl_to_string(NCR_700_readb(host, SBCL_REG))); 1591 #endif 1592 resume_offset = hostdata->pScript + Ent_SendMessagePhaseMismatch; 1593 } else if(dsp >= to32bit(&slot->pSG[0].ins) && 1594 dsp <= to32bit(&slot->pSG[NCR_700_SG_SEGMENTS].ins)) { 1595 int data_transfer = NCR_700_readl(host, DBC_REG) & 0xffffff; 1596 int SGcount = (dsp - to32bit(&slot->pSG[0].ins))/sizeof(struct NCR_700_SG_List); 1597 int residual = NCR_700_data_residual(host); 1598 int i; 1599 #ifdef NCR_700_DEBUG 1600 __u32 naddr = NCR_700_readl(host, DNAD_REG); 1601 1602 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x\n", 1603 host->host_no, pun, lun, 1604 SGcount, data_transfer); 1605 scsi_print_command(SCp); 1606 if(residual) { 1607 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x, residual %d\n", 1608 host->host_no, pun, lun, 1609 SGcount, data_transfer, residual); 1610 } 1611 #endif 1612 data_transfer += residual; 1613 1614 if(data_transfer != 0) { 1615 int count; 1616 __u32 pAddr; 1617 1618 SGcount--; 1619 1620 count = (bS_to_cpu(slot->SG[SGcount].ins) & 0x00ffffff); 1621 DEBUG(("DATA TRANSFER MISMATCH, count = %d, transferred %d\n", count, count-data_transfer)); 1622 slot->SG[SGcount].ins &= bS_to_host(0xff000000); 1623 slot->SG[SGcount].ins |= bS_to_host(data_transfer); 1624 pAddr = bS_to_cpu(slot->SG[SGcount].pAddr); 1625 pAddr += (count - data_transfer); 1626 #ifdef NCR_700_DEBUG 1627 if(pAddr != naddr) { 1628 printk("scsi%d (%d:%d) transfer mismatch pAddr=%lx, naddr=%lx, data_transfer=%d, residual=%d\n", host->host_no, pun, lun, (unsigned long)pAddr, (unsigned long)naddr, data_transfer, residual); 1629 } 1630 #endif 1631 slot->SG[SGcount].pAddr = bS_to_host(pAddr); 1632 } 1633 /* set the executed moves to nops */ 1634 for(i=0; i<SGcount; i++) { 1635 slot->SG[i].ins = bS_to_host(SCRIPT_NOP); 1636 slot->SG[i].pAddr = 0; 1637 } 1638 dma_cache_sync(slot->SG, sizeof(slot->SG), DMA_TO_DEVICE); 1639 /* and pretend we disconnected after 1640 * the command phase */ 1641 resume_offset = hostdata->pScript + Ent_MsgInDuringData; 1642 /* make sure all the data is flushed */ 1643 NCR_700_flush_fifo(host); 1644 } else { 1645 __u8 sbcl = NCR_700_readb(host, SBCL_REG); 1646 printk(KERN_ERR "scsi%d: (%d:%d) phase mismatch at %04x, phase %s\n", 1647 host->host_no, pun, lun, dsp - hostdata->pScript, sbcl_to_string(sbcl)); 1648 NCR_700_internal_bus_reset(host); 1649 } 1650 1651 } else if(sstat0 & SCSI_GROSS_ERROR) { 1652 printk(KERN_ERR "scsi%d: (%d:%d) GROSS ERROR\n", 1653 host->host_no, pun, lun); 1654 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16); 1655 } else if(sstat0 & PARITY_ERROR) { 1656 printk(KERN_ERR "scsi%d: (%d:%d) PARITY ERROR\n", 1657 host->host_no, pun, lun); 1658 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16); 1659 } else if(dstat & SCRIPT_INT_RECEIVED) { 1660 DEBUG(("scsi%d: (%d:%d) ====>SCRIPT INTERRUPT<====\n", 1661 host->host_no, pun, lun)); 1662 resume_offset = process_script_interrupt(dsps, dsp, SCp, host, hostdata); 1663 } else if(dstat & (ILGL_INST_DETECTED)) { 1664 printk(KERN_ERR "scsi%d: (%d:%d) Illegal Instruction detected at 0x%08x[0x%x]!!!\n" 1665 " Please email James.Bottomley@HansenPartnership.com with the details\n", 1666 host->host_no, pun, lun, 1667 dsp, dsp - hostdata->pScript); 1668 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16); 1669 } else if(dstat & (WATCH_DOG_INTERRUPT|ABORTED)) { 1670 printk(KERN_ERR "scsi%d: (%d:%d) serious DMA problem, dstat=%02x\n", 1671 host->host_no, pun, lun, dstat); 1672 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16); 1673 } 1674 1675 1676 /* NOTE: selection interrupt processing MUST occur 1677 * after script interrupt processing to correctly cope 1678 * with the case where we process a disconnect and 1679 * then get reselected before we process the 1680 * disconnection */ 1681 if(sstat0 & SELECTED) { 1682 /* FIXME: It currently takes at least FOUR 1683 * interrupts to complete a command that 1684 * disconnects: one for the disconnect, one 1685 * for the reselection, one to get the 1686 * reselection data and one to complete the 1687 * command. If we guess the reselected 1688 * command here and prepare it, we only need 1689 * to get a reselection data interrupt if we 1690 * guessed wrongly. Since the interrupt 1691 * overhead is much greater than the command 1692 * setup, this would be an efficient 1693 * optimisation particularly as we probably 1694 * only have one outstanding command on a 1695 * target most of the time */ 1696 1697 resume_offset = process_selection(host, dsp); 1698 1699 } 1700 1701 } 1702 1703 if(resume_offset) { 1704 if(hostdata->state != NCR_700_HOST_BUSY) { 1705 printk(KERN_ERR "scsi%d: Driver error: resume at 0x%08x [0x%04x] with non busy host!\n", 1706 host->host_no, resume_offset, resume_offset - hostdata->pScript); 1707 hostdata->state = NCR_700_HOST_BUSY; 1708 } 1709 1710 DEBUG(("Attempting to resume at %x\n", resume_offset)); 1711 NCR_700_clear_fifo(host); 1712 NCR_700_writel(resume_offset, host, DSP_REG); 1713 } 1714 /* There is probably a technical no-no about this: If we're a 1715 * shared interrupt and we got this interrupt because the 1716 * other device needs servicing not us, we're still going to 1717 * check our queued commands here---of course, there shouldn't 1718 * be any outstanding.... */ 1719 if(hostdata->state == NCR_700_HOST_FREE) { 1720 int i; 1721 1722 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) { 1723 /* fairness: always run the queue from the last 1724 * position we left off */ 1725 int j = (i + hostdata->saved_slot_position) 1726 % NCR_700_COMMAND_SLOTS_PER_HOST; 1727 1728 if(hostdata->slots[j].state != NCR_700_SLOT_QUEUED) 1729 continue; 1730 if(NCR_700_start_command(hostdata->slots[j].cmnd)) { 1731 DEBUG(("scsi%d: Issuing saved command slot %p, cmd %p\t\n", 1732 host->host_no, &hostdata->slots[j], 1733 hostdata->slots[j].cmnd)); 1734 hostdata->saved_slot_position = j + 1; 1735 } 1736 1737 break; 1738 } 1739 } 1740 out_unlock: 1741 spin_unlock_irqrestore(host->host_lock, flags); 1742 return IRQ_RETVAL(handled); 1743 } 1744 1745 STATIC int 1746 NCR_700_queuecommand(struct scsi_cmnd *SCp, void (*done)(struct scsi_cmnd *)) 1747 { 1748 struct NCR_700_Host_Parameters *hostdata = 1749 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0]; 1750 __u32 move_ins; 1751 enum dma_data_direction direction; 1752 struct NCR_700_command_slot *slot; 1753 1754 if(hostdata->command_slot_count >= NCR_700_COMMAND_SLOTS_PER_HOST) { 1755 /* We're over our allocation, this should never happen 1756 * since we report the max allocation to the mid layer */ 1757 printk(KERN_WARNING "scsi%d: Command depth has gone over queue depth\n", SCp->device->host->host_no); 1758 return 1; 1759 } 1760 /* check for untagged commands. We cannot have any outstanding 1761 * commands if we accept them. Commands could be untagged because: 1762 * 1763 * - The tag negotiated bitmap is clear 1764 * - The blk layer sent and untagged command 1765 */ 1766 if(NCR_700_get_depth(SCp->device) != 0 1767 && (!(hostdata->tag_negotiated & (1<<SCp->device->id)) 1768 || !blk_rq_tagged(SCp->request))) { 1769 DEBUG((KERN_ERR "scsi%d (%d:%d) has non zero depth %d\n", 1770 SCp->device->host->host_no, SCp->device->id, SCp->device->lun, 1771 NCR_700_get_depth(SCp->device))); 1772 return SCSI_MLQUEUE_DEVICE_BUSY; 1773 } 1774 if(NCR_700_get_depth(SCp->device) >= SCp->device->queue_depth) { 1775 DEBUG((KERN_ERR "scsi%d (%d:%d) has max tag depth %d\n", 1776 SCp->device->host->host_no, SCp->device->id, SCp->device->lun, 1777 NCR_700_get_depth(SCp->device))); 1778 return SCSI_MLQUEUE_DEVICE_BUSY; 1779 } 1780 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) + 1); 1781 1782 /* begin the command here */ 1783 /* no need to check for NULL, test for command_slot_count above 1784 * ensures a slot is free */ 1785 slot = find_empty_slot(hostdata); 1786 1787 slot->cmnd = SCp; 1788 1789 SCp->scsi_done = done; 1790 SCp->host_scribble = (unsigned char *)slot; 1791 SCp->SCp.ptr = NULL; 1792 SCp->SCp.buffer = NULL; 1793 1794 #ifdef NCR_700_DEBUG 1795 printk("53c700: scsi%d, command ", SCp->device->host->host_no); 1796 scsi_print_command(SCp); 1797 #endif 1798 if(blk_rq_tagged(SCp->request) 1799 && (hostdata->tag_negotiated &(1<<SCp->device->id)) == 0 1800 && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_START_TAG_NEGOTIATION) { 1801 printk(KERN_ERR "scsi%d: (%d:%d) Enabling Tag Command Queuing\n", SCp->device->host->host_no, SCp->device->id, SCp->device->lun); 1802 hostdata->tag_negotiated |= (1<<SCp->device->id); 1803 NCR_700_set_tag_neg_state(SCp->device, NCR_700_DURING_TAG_NEGOTIATION); 1804 } 1805 1806 /* here we may have to process an untagged command. The gate 1807 * above ensures that this will be the only one outstanding, 1808 * so clear the tag negotiated bit. 1809 * 1810 * FIXME: This will royally screw up on multiple LUN devices 1811 * */ 1812 if(!blk_rq_tagged(SCp->request) 1813 && (hostdata->tag_negotiated &(1<<SCp->device->id))) { 1814 printk(KERN_INFO "scsi%d: (%d:%d) Disabling Tag Command Queuing\n", SCp->device->host->host_no, SCp->device->id, SCp->device->lun); 1815 hostdata->tag_negotiated &= ~(1<<SCp->device->id); 1816 } 1817 1818 if((hostdata->tag_negotiated &(1<<SCp->device->id)) 1819 && scsi_get_tag_type(SCp->device)) { 1820 slot->tag = SCp->request->tag; 1821 DEBUG(("53c700 %d:%d:%d, sending out tag %d, slot %p\n", 1822 SCp->device->host->host_no, SCp->device->id, SCp->device->lun, slot->tag, 1823 slot)); 1824 } else { 1825 slot->tag = SCSI_NO_TAG; 1826 /* must populate current_cmnd for scsi_find_tag to work */ 1827 SCp->device->current_cmnd = SCp; 1828 } 1829 /* sanity check: some of the commands generated by the mid-layer 1830 * have an eccentric idea of their sc_data_direction */ 1831 if(!SCp->use_sg && !SCp->request_bufflen 1832 && SCp->sc_data_direction != DMA_NONE) { 1833 #ifdef NCR_700_DEBUG 1834 printk("53c700: Command"); 1835 scsi_print_command(SCp); 1836 printk("Has wrong data direction %d\n", SCp->sc_data_direction); 1837 #endif 1838 SCp->sc_data_direction = DMA_NONE; 1839 } 1840 1841 switch (SCp->cmnd[0]) { 1842 case REQUEST_SENSE: 1843 /* clear the internal sense magic */ 1844 SCp->cmnd[6] = 0; 1845 /* fall through */ 1846 default: 1847 /* OK, get it from the command */ 1848 switch(SCp->sc_data_direction) { 1849 case DMA_BIDIRECTIONAL: 1850 default: 1851 printk(KERN_ERR "53c700: Unknown command for data direction "); 1852 scsi_print_command(SCp); 1853 1854 move_ins = 0; 1855 break; 1856 case DMA_NONE: 1857 move_ins = 0; 1858 break; 1859 case DMA_FROM_DEVICE: 1860 move_ins = SCRIPT_MOVE_DATA_IN; 1861 break; 1862 case DMA_TO_DEVICE: 1863 move_ins = SCRIPT_MOVE_DATA_OUT; 1864 break; 1865 } 1866 } 1867 1868 /* now build the scatter gather list */ 1869 direction = SCp->sc_data_direction; 1870 if(move_ins != 0) { 1871 int i; 1872 int sg_count; 1873 dma_addr_t vPtr = 0; 1874 __u32 count = 0; 1875 1876 if(SCp->use_sg) { 1877 sg_count = dma_map_sg(hostdata->dev, SCp->buffer, 1878 SCp->use_sg, direction); 1879 } else { 1880 vPtr = dma_map_single(hostdata->dev, 1881 SCp->request_buffer, 1882 SCp->request_bufflen, 1883 direction); 1884 count = SCp->request_bufflen; 1885 slot->dma_handle = vPtr; 1886 sg_count = 1; 1887 } 1888 1889 1890 for(i = 0; i < sg_count; i++) { 1891 1892 if(SCp->use_sg) { 1893 struct scatterlist *sg = SCp->buffer; 1894 1895 vPtr = sg_dma_address(&sg[i]); 1896 count = sg_dma_len(&sg[i]); 1897 } 1898 1899 slot->SG[i].ins = bS_to_host(move_ins | count); 1900 DEBUG((" scatter block %d: move %d[%08x] from 0x%lx\n", 1901 i, count, slot->SG[i].ins, (unsigned long)vPtr)); 1902 slot->SG[i].pAddr = bS_to_host(vPtr); 1903 } 1904 slot->SG[i].ins = bS_to_host(SCRIPT_RETURN); 1905 slot->SG[i].pAddr = 0; 1906 dma_cache_sync(slot->SG, sizeof(slot->SG), DMA_TO_DEVICE); 1907 DEBUG((" SETTING %08lx to %x\n", 1908 (&slot->pSG[i].ins), 1909 slot->SG[i].ins)); 1910 } 1911 slot->resume_offset = 0; 1912 slot->pCmd = dma_map_single(hostdata->dev, SCp->cmnd, 1913 sizeof(SCp->cmnd), DMA_TO_DEVICE); 1914 NCR_700_start_command(SCp); 1915 return 0; 1916 } 1917 1918 STATIC int 1919 NCR_700_abort(struct scsi_cmnd * SCp) 1920 { 1921 struct NCR_700_command_slot *slot; 1922 1923 printk(KERN_INFO "scsi%d (%d:%d) New error handler wants to abort command\n\t", 1924 SCp->device->host->host_no, SCp->device->id, SCp->device->lun); 1925 scsi_print_command(SCp); 1926 1927 slot = (struct NCR_700_command_slot *)SCp->host_scribble; 1928 1929 if(slot == NULL) 1930 /* no outstanding command to abort */ 1931 return SUCCESS; 1932 if(SCp->cmnd[0] == TEST_UNIT_READY) { 1933 /* FIXME: This is because of a problem in the new 1934 * error handler. When it is in error recovery, it 1935 * will send a TUR to a device it thinks may still be 1936 * showing a problem. If the TUR isn't responded to, 1937 * it will abort it and mark the device off line. 1938 * Unfortunately, it does no other error recovery, so 1939 * this would leave us with an outstanding command 1940 * occupying a slot. Rather than allow this to 1941 * happen, we issue a bus reset to force all 1942 * outstanding commands to terminate here. */ 1943 NCR_700_internal_bus_reset(SCp->device->host); 1944 /* still drop through and return failed */ 1945 } 1946 return FAILED; 1947 1948 } 1949 1950 STATIC int 1951 NCR_700_bus_reset(struct scsi_cmnd * SCp) 1952 { 1953 DECLARE_COMPLETION(complete); 1954 struct NCR_700_Host_Parameters *hostdata = 1955 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0]; 1956 1957 printk(KERN_INFO "scsi%d (%d:%d) New error handler wants BUS reset, cmd %p\n\t", 1958 SCp->device->host->host_no, SCp->device->id, SCp->device->lun, SCp); 1959 scsi_print_command(SCp); 1960 1961 /* In theory, eh_complete should always be null because the 1962 * eh is single threaded, but just in case we're handling a 1963 * reset via sg or something */ 1964 spin_lock_irq(SCp->device->host->host_lock); 1965 while (hostdata->eh_complete != NULL) { 1966 spin_unlock_irq(SCp->device->host->host_lock); 1967 msleep_interruptible(100); 1968 spin_lock_irq(SCp->device->host->host_lock); 1969 } 1970 1971 hostdata->eh_complete = &complete; 1972 NCR_700_internal_bus_reset(SCp->device->host); 1973 1974 spin_unlock_irq(SCp->device->host->host_lock); 1975 wait_for_completion(&complete); 1976 spin_lock_irq(SCp->device->host->host_lock); 1977 1978 hostdata->eh_complete = NULL; 1979 /* Revalidate the transport parameters of the failing device */ 1980 if(hostdata->fast) 1981 spi_schedule_dv_device(SCp->device); 1982 1983 spin_unlock_irq(SCp->device->host->host_lock); 1984 return SUCCESS; 1985 } 1986 1987 STATIC int 1988 NCR_700_host_reset(struct scsi_cmnd * SCp) 1989 { 1990 printk(KERN_INFO "scsi%d (%d:%d) New error handler wants HOST reset\n\t", 1991 SCp->device->host->host_no, SCp->device->id, SCp->device->lun); 1992 scsi_print_command(SCp); 1993 1994 spin_lock_irq(SCp->device->host->host_lock); 1995 1996 NCR_700_internal_bus_reset(SCp->device->host); 1997 NCR_700_chip_reset(SCp->device->host); 1998 1999 spin_unlock_irq(SCp->device->host->host_lock); 2000 2001 return SUCCESS; 2002 } 2003 2004 STATIC void 2005 NCR_700_set_period(struct scsi_target *STp, int period) 2006 { 2007 struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent); 2008 struct NCR_700_Host_Parameters *hostdata = 2009 (struct NCR_700_Host_Parameters *)SHp->hostdata[0]; 2010 2011 if(!hostdata->fast) 2012 return; 2013 2014 if(period < hostdata->min_period) 2015 period = hostdata->min_period; 2016 2017 spi_period(STp) = period; 2018 spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC | 2019 NCR_700_DEV_BEGIN_SYNC_NEGOTIATION); 2020 spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION; 2021 } 2022 2023 STATIC void 2024 NCR_700_set_offset(struct scsi_target *STp, int offset) 2025 { 2026 struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent); 2027 struct NCR_700_Host_Parameters *hostdata = 2028 (struct NCR_700_Host_Parameters *)SHp->hostdata[0]; 2029 int max_offset = hostdata->chip710 2030 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET; 2031 2032 if(!hostdata->fast) 2033 return; 2034 2035 if(offset > max_offset) 2036 offset = max_offset; 2037 2038 /* if we're currently async, make sure the period is reasonable */ 2039 if(spi_offset(STp) == 0 && (spi_period(STp) < hostdata->min_period || 2040 spi_period(STp) > 0xff)) 2041 spi_period(STp) = hostdata->min_period; 2042 2043 spi_offset(STp) = offset; 2044 spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC | 2045 NCR_700_DEV_BEGIN_SYNC_NEGOTIATION); 2046 spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION; 2047 } 2048 2049 2050 2051 STATIC int 2052 NCR_700_slave_configure(struct scsi_device *SDp) 2053 { 2054 struct NCR_700_Host_Parameters *hostdata = 2055 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0]; 2056 2057 /* to do here: allocate memory; build a queue_full list */ 2058 if(SDp->tagged_supported) { 2059 scsi_set_tag_type(SDp, MSG_ORDERED_TAG); 2060 scsi_activate_tcq(SDp, NCR_700_DEFAULT_TAGS); 2061 NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION); 2062 } else { 2063 /* initialise to default depth */ 2064 scsi_adjust_queue_depth(SDp, 0, SDp->host->cmd_per_lun); 2065 } 2066 if(hostdata->fast) { 2067 /* Find the correct offset and period via domain validation */ 2068 if (!spi_initial_dv(SDp->sdev_target)) 2069 spi_dv_device(SDp); 2070 } else { 2071 spi_offset(SDp->sdev_target) = 0; 2072 spi_period(SDp->sdev_target) = 0; 2073 } 2074 return 0; 2075 } 2076 2077 STATIC void 2078 NCR_700_slave_destroy(struct scsi_device *SDp) 2079 { 2080 /* to do here: deallocate memory */ 2081 } 2082 2083 static int 2084 NCR_700_change_queue_depth(struct scsi_device *SDp, int depth) 2085 { 2086 if (depth > NCR_700_MAX_TAGS) 2087 depth = NCR_700_MAX_TAGS; 2088 2089 scsi_adjust_queue_depth(SDp, scsi_get_tag_type(SDp), depth); 2090 return depth; 2091 } 2092 2093 static int NCR_700_change_queue_type(struct scsi_device *SDp, int tag_type) 2094 { 2095 int change_tag = ((tag_type ==0 && scsi_get_tag_type(SDp) != 0) 2096 || (tag_type != 0 && scsi_get_tag_type(SDp) == 0)); 2097 struct NCR_700_Host_Parameters *hostdata = 2098 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0]; 2099 2100 scsi_set_tag_type(SDp, tag_type); 2101 2102 /* We have a global (per target) flag to track whether TCQ is 2103 * enabled, so we'll be turning it off for the entire target here. 2104 * our tag algorithm will fail if we mix tagged and untagged commands, 2105 * so quiesce the device before doing this */ 2106 if (change_tag) 2107 scsi_target_quiesce(SDp->sdev_target); 2108 2109 if (!tag_type) { 2110 /* shift back to the default unqueued number of commands 2111 * (the user can still raise this) */ 2112 scsi_deactivate_tcq(SDp, SDp->host->cmd_per_lun); 2113 hostdata->tag_negotiated &= ~(1 << SDp->id); 2114 } else { 2115 /* Here, we cleared the negotiation flag above, so this 2116 * will force the driver to renegotiate */ 2117 scsi_activate_tcq(SDp, SDp->queue_depth); 2118 if (change_tag) 2119 NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION); 2120 } 2121 if (change_tag) 2122 scsi_target_resume(SDp->sdev_target); 2123 2124 return tag_type; 2125 } 2126 2127 static ssize_t 2128 NCR_700_show_active_tags(struct device *dev, struct device_attribute *attr, char *buf) 2129 { 2130 struct scsi_device *SDp = to_scsi_device(dev); 2131 2132 return snprintf(buf, 20, "%d\n", NCR_700_get_depth(SDp)); 2133 } 2134 2135 static struct device_attribute NCR_700_active_tags_attr = { 2136 .attr = { 2137 .name = "active_tags", 2138 .mode = S_IRUGO, 2139 }, 2140 .show = NCR_700_show_active_tags, 2141 }; 2142 2143 STATIC struct device_attribute *NCR_700_dev_attrs[] = { 2144 &NCR_700_active_tags_attr, 2145 NULL, 2146 }; 2147 2148 EXPORT_SYMBOL(NCR_700_detect); 2149 EXPORT_SYMBOL(NCR_700_release); 2150 EXPORT_SYMBOL(NCR_700_intr); 2151 2152 static struct spi_function_template NCR_700_transport_functions = { 2153 .set_period = NCR_700_set_period, 2154 .show_period = 1, 2155 .set_offset = NCR_700_set_offset, 2156 .show_offset = 1, 2157 }; 2158 2159 static int __init NCR_700_init(void) 2160 { 2161 NCR_700_transport_template = spi_attach_transport(&NCR_700_transport_functions); 2162 if(!NCR_700_transport_template) 2163 return -ENODEV; 2164 return 0; 2165 } 2166 2167 static void __exit NCR_700_exit(void) 2168 { 2169 spi_release_transport(NCR_700_transport_template); 2170 } 2171 2172 module_init(NCR_700_init); 2173 module_exit(NCR_700_exit); 2174 2175