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 <linux/device.h> 132 #include <asm/dma.h> 133 #include <asm/system.h> 134 #include <asm/io.h> 135 #include <asm/pgtable.h> 136 #include <asm/byteorder.h> 137 138 #include <scsi/scsi.h> 139 #include <scsi/scsi_cmnd.h> 140 #include <scsi/scsi_dbg.h> 141 #include <scsi/scsi_eh.h> 142 #include <scsi/scsi_host.h> 143 #include <scsi/scsi_tcq.h> 144 #include <scsi/scsi_transport.h> 145 #include <scsi/scsi_transport_spi.h> 146 147 #include "53c700.h" 148 149 /* NOTE: For 64 bit drivers there are points in the code where we use 150 * a non dereferenceable pointer to point to a structure in dma-able 151 * memory (which is 32 bits) so that we can use all of the structure 152 * operations but take the address at the end. This macro allows us 153 * to truncate the 64 bit pointer down to 32 bits without the compiler 154 * complaining */ 155 #define to32bit(x) ((__u32)((unsigned long)(x))) 156 157 #ifdef NCR_700_DEBUG 158 #define STATIC 159 #else 160 #define STATIC static 161 #endif 162 163 MODULE_AUTHOR("James Bottomley"); 164 MODULE_DESCRIPTION("53c700 and 53c700-66 Driver"); 165 MODULE_LICENSE("GPL"); 166 167 /* This is the script */ 168 #include "53c700_d.h" 169 170 171 STATIC int NCR_700_queuecommand(struct scsi_cmnd *, void (*done)(struct scsi_cmnd *)); 172 STATIC int NCR_700_abort(struct scsi_cmnd * SCpnt); 173 STATIC int NCR_700_bus_reset(struct scsi_cmnd * SCpnt); 174 STATIC int NCR_700_host_reset(struct scsi_cmnd * SCpnt); 175 STATIC void NCR_700_chip_setup(struct Scsi_Host *host); 176 STATIC void NCR_700_chip_reset(struct Scsi_Host *host); 177 STATIC int NCR_700_slave_configure(struct scsi_device *SDpnt); 178 STATIC void NCR_700_slave_destroy(struct scsi_device *SDpnt); 179 static int NCR_700_change_queue_depth(struct scsi_device *SDpnt, int depth); 180 static int NCR_700_change_queue_type(struct scsi_device *SDpnt, int depth); 181 182 STATIC struct device_attribute *NCR_700_dev_attrs[]; 183 184 STATIC struct scsi_transport_template *NCR_700_transport_template = NULL; 185 186 struct NCR_700_sense { 187 unsigned char cmnd[MAX_COMMAND_SIZE]; 188 }; 189 190 static char *NCR_700_phase[] = { 191 "", 192 "after selection", 193 "before command phase", 194 "after command phase", 195 "after status phase", 196 "after data in phase", 197 "after data out phase", 198 "during data phase", 199 }; 200 201 static char *NCR_700_condition[] = { 202 "", 203 "NOT MSG_OUT", 204 "UNEXPECTED PHASE", 205 "NOT MSG_IN", 206 "UNEXPECTED MSG", 207 "MSG_IN", 208 "SDTR_MSG RECEIVED", 209 "REJECT_MSG RECEIVED", 210 "DISCONNECT_MSG RECEIVED", 211 "MSG_OUT", 212 "DATA_IN", 213 214 }; 215 216 static char *NCR_700_fatal_messages[] = { 217 "unexpected message after reselection", 218 "still MSG_OUT after message injection", 219 "not MSG_IN after selection", 220 "Illegal message length received", 221 }; 222 223 static char *NCR_700_SBCL_bits[] = { 224 "IO ", 225 "CD ", 226 "MSG ", 227 "ATN ", 228 "SEL ", 229 "BSY ", 230 "ACK ", 231 "REQ ", 232 }; 233 234 static char *NCR_700_SBCL_to_phase[] = { 235 "DATA_OUT", 236 "DATA_IN", 237 "CMD_OUT", 238 "STATE", 239 "ILLEGAL PHASE", 240 "ILLEGAL PHASE", 241 "MSG OUT", 242 "MSG IN", 243 }; 244 245 /* This translates the SDTR message offset and period to a value 246 * which can be loaded into the SXFER_REG. 247 * 248 * NOTE: According to SCSI-2, the true transfer period (in ns) is 249 * actually four times this period value */ 250 static inline __u8 251 NCR_700_offset_period_to_sxfer(struct NCR_700_Host_Parameters *hostdata, 252 __u8 offset, __u8 period) 253 { 254 int XFERP; 255 256 __u8 min_xferp = (hostdata->chip710 257 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP); 258 __u8 max_offset = (hostdata->chip710 259 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET); 260 261 if(offset == 0) 262 return 0; 263 264 if(period < hostdata->min_period) { 265 printk(KERN_WARNING "53c700: Period %dns is less than this chip's minimum, setting to %d\n", period*4, NCR_700_MIN_PERIOD*4); 266 period = hostdata->min_period; 267 } 268 XFERP = (period*4 * hostdata->sync_clock)/1000 - 4; 269 if(offset > max_offset) { 270 printk(KERN_WARNING "53c700: Offset %d exceeds chip maximum, setting to %d\n", 271 offset, max_offset); 272 offset = max_offset; 273 } 274 if(XFERP < min_xferp) { 275 printk(KERN_WARNING "53c700: XFERP %d is less than minium, setting to %d\n", 276 XFERP, min_xferp); 277 XFERP = min_xferp; 278 } 279 return (offset & 0x0f) | (XFERP & 0x07)<<4; 280 } 281 282 static inline __u8 283 NCR_700_get_SXFER(struct scsi_device *SDp) 284 { 285 struct NCR_700_Host_Parameters *hostdata = 286 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0]; 287 288 return NCR_700_offset_period_to_sxfer(hostdata, 289 spi_offset(SDp->sdev_target), 290 spi_period(SDp->sdev_target)); 291 } 292 293 struct Scsi_Host * 294 NCR_700_detect(struct scsi_host_template *tpnt, 295 struct NCR_700_Host_Parameters *hostdata, struct device *dev) 296 { 297 dma_addr_t pScript, pSlots; 298 __u8 *memory; 299 __u32 *script; 300 struct Scsi_Host *host; 301 static int banner = 0; 302 int j; 303 304 if(tpnt->sdev_attrs == NULL) 305 tpnt->sdev_attrs = NCR_700_dev_attrs; 306 307 memory = dma_alloc_noncoherent(hostdata->dev, TOTAL_MEM_SIZE, 308 &pScript, GFP_KERNEL); 309 if(memory == NULL) { 310 printk(KERN_ERR "53c700: Failed to allocate memory for driver, detatching\n"); 311 return NULL; 312 } 313 314 script = (__u32 *)memory; 315 hostdata->msgin = memory + MSGIN_OFFSET; 316 hostdata->msgout = memory + MSGOUT_OFFSET; 317 hostdata->status = memory + STATUS_OFFSET; 318 /* all of these offsets are L1_CACHE_BYTES separated. It is fatal 319 * if this isn't sufficient separation to avoid dma flushing issues */ 320 BUG_ON(!dma_is_consistent(pScript) && L1_CACHE_BYTES < dma_get_cache_alignment()); 321 hostdata->slots = (struct NCR_700_command_slot *)(memory + SLOTS_OFFSET); 322 hostdata->dev = dev; 323 324 pSlots = pScript + SLOTS_OFFSET; 325 326 /* Fill in the missing routines from the host template */ 327 tpnt->queuecommand = NCR_700_queuecommand; 328 tpnt->eh_abort_handler = NCR_700_abort; 329 tpnt->eh_bus_reset_handler = NCR_700_bus_reset; 330 tpnt->eh_host_reset_handler = NCR_700_host_reset; 331 tpnt->can_queue = NCR_700_COMMAND_SLOTS_PER_HOST; 332 tpnt->sg_tablesize = NCR_700_SG_SEGMENTS; 333 tpnt->cmd_per_lun = NCR_700_CMD_PER_LUN; 334 tpnt->use_clustering = ENABLE_CLUSTERING; 335 tpnt->slave_configure = NCR_700_slave_configure; 336 tpnt->slave_destroy = NCR_700_slave_destroy; 337 tpnt->change_queue_depth = NCR_700_change_queue_depth; 338 tpnt->change_queue_type = NCR_700_change_queue_type; 339 340 if(tpnt->name == NULL) 341 tpnt->name = "53c700"; 342 if(tpnt->proc_name == NULL) 343 tpnt->proc_name = "53c700"; 344 345 host = scsi_host_alloc(tpnt, 4); 346 if (!host) 347 return NULL; 348 memset(hostdata->slots, 0, sizeof(struct NCR_700_command_slot) 349 * NCR_700_COMMAND_SLOTS_PER_HOST); 350 for (j = 0; j < NCR_700_COMMAND_SLOTS_PER_HOST; j++) { 351 dma_addr_t offset = (dma_addr_t)((unsigned long)&hostdata->slots[j].SG[0] 352 - (unsigned long)&hostdata->slots[0].SG[0]); 353 hostdata->slots[j].pSG = (struct NCR_700_SG_List *)((unsigned long)(pSlots + offset)); 354 if(j == 0) 355 hostdata->free_list = &hostdata->slots[j]; 356 else 357 hostdata->slots[j-1].ITL_forw = &hostdata->slots[j]; 358 hostdata->slots[j].state = NCR_700_SLOT_FREE; 359 } 360 361 for (j = 0; j < ARRAY_SIZE(SCRIPT); j++) 362 script[j] = bS_to_host(SCRIPT[j]); 363 364 /* adjust all labels to be bus physical */ 365 for (j = 0; j < PATCHES; j++) 366 script[LABELPATCHES[j]] = bS_to_host(pScript + SCRIPT[LABELPATCHES[j]]); 367 /* now patch up fixed addresses. */ 368 script_patch_32(script, MessageLocation, 369 pScript + MSGOUT_OFFSET); 370 script_patch_32(script, StatusAddress, 371 pScript + STATUS_OFFSET); 372 script_patch_32(script, ReceiveMsgAddress, 373 pScript + MSGIN_OFFSET); 374 375 hostdata->script = script; 376 hostdata->pScript = pScript; 377 dma_sync_single_for_device(hostdata->dev, pScript, sizeof(SCRIPT), DMA_TO_DEVICE); 378 hostdata->state = NCR_700_HOST_FREE; 379 hostdata->cmd = NULL; 380 host->max_id = 8; 381 host->max_lun = NCR_700_MAX_LUNS; 382 BUG_ON(NCR_700_transport_template == NULL); 383 host->transportt = NCR_700_transport_template; 384 host->unique_id = (unsigned long)hostdata->base; 385 hostdata->eh_complete = NULL; 386 host->hostdata[0] = (unsigned long)hostdata; 387 /* kick the chip */ 388 NCR_700_writeb(0xff, host, CTEST9_REG); 389 if (hostdata->chip710) 390 hostdata->rev = (NCR_700_readb(host, CTEST8_REG)>>4) & 0x0f; 391 else 392 hostdata->rev = (NCR_700_readb(host, CTEST7_REG)>>4) & 0x0f; 393 hostdata->fast = (NCR_700_readb(host, CTEST9_REG) == 0); 394 if (banner == 0) { 395 printk(KERN_NOTICE "53c700: Version " NCR_700_VERSION " By James.Bottomley@HansenPartnership.com\n"); 396 banner = 1; 397 } 398 printk(KERN_NOTICE "scsi%d: %s rev %d %s\n", host->host_no, 399 hostdata->chip710 ? "53c710" : 400 (hostdata->fast ? "53c700-66" : "53c700"), 401 hostdata->rev, hostdata->differential ? 402 "(Differential)" : ""); 403 /* reset the chip */ 404 NCR_700_chip_reset(host); 405 406 if (scsi_add_host(host, dev)) { 407 dev_printk(KERN_ERR, dev, "53c700: scsi_add_host failed\n"); 408 scsi_host_put(host); 409 return NULL; 410 } 411 412 spi_signalling(host) = hostdata->differential ? SPI_SIGNAL_HVD : 413 SPI_SIGNAL_SE; 414 415 return host; 416 } 417 418 int 419 NCR_700_release(struct Scsi_Host *host) 420 { 421 struct NCR_700_Host_Parameters *hostdata = 422 (struct NCR_700_Host_Parameters *)host->hostdata[0]; 423 424 dma_free_noncoherent(hostdata->dev, TOTAL_MEM_SIZE, 425 hostdata->script, hostdata->pScript); 426 return 1; 427 } 428 429 static inline __u8 430 NCR_700_identify(int can_disconnect, __u8 lun) 431 { 432 return IDENTIFY_BASE | 433 ((can_disconnect) ? 0x40 : 0) | 434 (lun & NCR_700_LUN_MASK); 435 } 436 437 /* 438 * Function : static int data_residual (Scsi_Host *host) 439 * 440 * Purpose : return residual data count of what's in the chip. If you 441 * really want to know what this function is doing, it's almost a 442 * direct transcription of the algorithm described in the 53c710 443 * guide, except that the DBC and DFIFO registers are only 6 bits 444 * wide on a 53c700. 445 * 446 * Inputs : host - SCSI host */ 447 static inline int 448 NCR_700_data_residual (struct Scsi_Host *host) { 449 struct NCR_700_Host_Parameters *hostdata = 450 (struct NCR_700_Host_Parameters *)host->hostdata[0]; 451 int count, synchronous = 0; 452 unsigned int ddir; 453 454 if(hostdata->chip710) { 455 count = ((NCR_700_readb(host, DFIFO_REG) & 0x7f) - 456 (NCR_700_readl(host, DBC_REG) & 0x7f)) & 0x7f; 457 } else { 458 count = ((NCR_700_readb(host, DFIFO_REG) & 0x3f) - 459 (NCR_700_readl(host, DBC_REG) & 0x3f)) & 0x3f; 460 } 461 462 if(hostdata->fast) 463 synchronous = NCR_700_readb(host, SXFER_REG) & 0x0f; 464 465 /* get the data direction */ 466 ddir = NCR_700_readb(host, CTEST0_REG) & 0x01; 467 468 if (ddir) { 469 /* Receive */ 470 if (synchronous) 471 count += (NCR_700_readb(host, SSTAT2_REG) & 0xf0) >> 4; 472 else 473 if (NCR_700_readb(host, SSTAT1_REG) & SIDL_REG_FULL) 474 ++count; 475 } else { 476 /* Send */ 477 __u8 sstat = NCR_700_readb(host, SSTAT1_REG); 478 if (sstat & SODL_REG_FULL) 479 ++count; 480 if (synchronous && (sstat & SODR_REG_FULL)) 481 ++count; 482 } 483 #ifdef NCR_700_DEBUG 484 if(count) 485 printk("RESIDUAL IS %d (ddir %d)\n", count, ddir); 486 #endif 487 return count; 488 } 489 490 /* print out the SCSI wires and corresponding phase from the SBCL register 491 * in the chip */ 492 static inline char * 493 sbcl_to_string(__u8 sbcl) 494 { 495 int i; 496 static char ret[256]; 497 498 ret[0]='\0'; 499 for(i=0; i<8; i++) { 500 if((1<<i) & sbcl) 501 strcat(ret, NCR_700_SBCL_bits[i]); 502 } 503 strcat(ret, NCR_700_SBCL_to_phase[sbcl & 0x07]); 504 return ret; 505 } 506 507 static inline __u8 508 bitmap_to_number(__u8 bitmap) 509 { 510 __u8 i; 511 512 for(i=0; i<8 && !(bitmap &(1<<i)); i++) 513 ; 514 return i; 515 } 516 517 /* Pull a slot off the free list */ 518 STATIC struct NCR_700_command_slot * 519 find_empty_slot(struct NCR_700_Host_Parameters *hostdata) 520 { 521 struct NCR_700_command_slot *slot = hostdata->free_list; 522 523 if(slot == NULL) { 524 /* sanity check */ 525 if(hostdata->command_slot_count != NCR_700_COMMAND_SLOTS_PER_HOST) 526 printk(KERN_ERR "SLOTS FULL, but count is %d, should be %d\n", hostdata->command_slot_count, NCR_700_COMMAND_SLOTS_PER_HOST); 527 return NULL; 528 } 529 530 if(slot->state != NCR_700_SLOT_FREE) 531 /* should panic! */ 532 printk(KERN_ERR "BUSY SLOT ON FREE LIST!!!\n"); 533 534 535 hostdata->free_list = slot->ITL_forw; 536 slot->ITL_forw = NULL; 537 538 539 /* NOTE: set the state to busy here, not queued, since this 540 * indicates the slot is in use and cannot be run by the IRQ 541 * finish routine. If we cannot queue the command when it 542 * is properly build, we then change to NCR_700_SLOT_QUEUED */ 543 slot->state = NCR_700_SLOT_BUSY; 544 slot->flags = 0; 545 hostdata->command_slot_count++; 546 547 return slot; 548 } 549 550 STATIC void 551 free_slot(struct NCR_700_command_slot *slot, 552 struct NCR_700_Host_Parameters *hostdata) 553 { 554 if((slot->state & NCR_700_SLOT_MASK) != NCR_700_SLOT_MAGIC) { 555 printk(KERN_ERR "53c700: SLOT %p is not MAGIC!!!\n", slot); 556 } 557 if(slot->state == NCR_700_SLOT_FREE) { 558 printk(KERN_ERR "53c700: SLOT %p is FREE!!!\n", slot); 559 } 560 561 slot->resume_offset = 0; 562 slot->cmnd = NULL; 563 slot->state = NCR_700_SLOT_FREE; 564 slot->ITL_forw = hostdata->free_list; 565 hostdata->free_list = slot; 566 hostdata->command_slot_count--; 567 } 568 569 570 /* This routine really does very little. The command is indexed on 571 the ITL and (if tagged) the ITLQ lists in _queuecommand */ 572 STATIC void 573 save_for_reselection(struct NCR_700_Host_Parameters *hostdata, 574 struct scsi_cmnd *SCp, __u32 dsp) 575 { 576 /* Its just possible that this gets executed twice */ 577 if(SCp != NULL) { 578 struct NCR_700_command_slot *slot = 579 (struct NCR_700_command_slot *)SCp->host_scribble; 580 581 slot->resume_offset = dsp; 582 } 583 hostdata->state = NCR_700_HOST_FREE; 584 hostdata->cmd = NULL; 585 } 586 587 STATIC inline void 588 NCR_700_unmap(struct NCR_700_Host_Parameters *hostdata, struct scsi_cmnd *SCp, 589 struct NCR_700_command_slot *slot) 590 { 591 if(SCp->sc_data_direction != DMA_NONE && 592 SCp->sc_data_direction != DMA_BIDIRECTIONAL) { 593 if(SCp->use_sg) { 594 dma_unmap_sg(hostdata->dev, SCp->request_buffer, 595 SCp->use_sg, SCp->sc_data_direction); 596 } else { 597 dma_unmap_single(hostdata->dev, slot->dma_handle, 598 SCp->request_bufflen, 599 SCp->sc_data_direction); 600 } 601 } 602 } 603 604 STATIC inline void 605 NCR_700_scsi_done(struct NCR_700_Host_Parameters *hostdata, 606 struct scsi_cmnd *SCp, int result) 607 { 608 hostdata->state = NCR_700_HOST_FREE; 609 hostdata->cmd = NULL; 610 611 if(SCp != NULL) { 612 struct NCR_700_command_slot *slot = 613 (struct NCR_700_command_slot *)SCp->host_scribble; 614 615 NCR_700_unmap(hostdata, SCp, slot); 616 if (slot->flags == NCR_700_FLAG_AUTOSENSE) { 617 struct NCR_700_sense *sense = SCp->device->hostdata; 618 #ifdef NCR_700_DEBUG 619 printk(" ORIGINAL CMD %p RETURNED %d, new return is %d sense is\n", 620 SCp, SCp->cmnd[7], result); 621 scsi_print_sense("53c700", SCp); 622 623 #endif 624 dma_unmap_single(hostdata->dev, slot->dma_handle, sizeof(SCp->sense_buffer), DMA_FROM_DEVICE); 625 /* restore the old result if the request sense was 626 * successful */ 627 if(result == 0) 628 result = sense->cmnd[7]; 629 } else 630 dma_unmap_single(hostdata->dev, slot->pCmd, 631 sizeof(SCp->cmnd), DMA_TO_DEVICE); 632 633 free_slot(slot, hostdata); 634 #ifdef NCR_700_DEBUG 635 if(NCR_700_get_depth(SCp->device) == 0 || 636 NCR_700_get_depth(SCp->device) > SCp->device->queue_depth) 637 printk(KERN_ERR "Invalid depth in NCR_700_scsi_done(): %d\n", 638 NCR_700_get_depth(SCp->device)); 639 #endif /* NCR_700_DEBUG */ 640 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) - 1); 641 642 SCp->host_scribble = NULL; 643 SCp->result = result; 644 SCp->scsi_done(SCp); 645 } else { 646 printk(KERN_ERR "53c700: SCSI DONE HAS NULL SCp\n"); 647 } 648 } 649 650 651 STATIC void 652 NCR_700_internal_bus_reset(struct Scsi_Host *host) 653 { 654 /* Bus reset */ 655 NCR_700_writeb(ASSERT_RST, host, SCNTL1_REG); 656 udelay(50); 657 NCR_700_writeb(0, host, SCNTL1_REG); 658 659 } 660 661 STATIC void 662 NCR_700_chip_setup(struct Scsi_Host *host) 663 { 664 struct NCR_700_Host_Parameters *hostdata = 665 (struct NCR_700_Host_Parameters *)host->hostdata[0]; 666 __u32 dcntl_extra = 0; 667 __u8 min_period; 668 __u8 min_xferp = (hostdata->chip710 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP); 669 670 if(hostdata->chip710) { 671 __u8 burst_disable = hostdata->burst_disable 672 ? BURST_DISABLE : 0; 673 dcntl_extra = COMPAT_700_MODE; 674 675 NCR_700_writeb(dcntl_extra, host, DCNTL_REG); 676 NCR_700_writeb(BURST_LENGTH_8 | hostdata->dmode_extra, 677 host, DMODE_710_REG); 678 NCR_700_writeb(burst_disable | (hostdata->differential ? 679 DIFF : 0), host, CTEST7_REG); 680 NCR_700_writeb(BTB_TIMER_DISABLE, host, CTEST0_REG); 681 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY | PARITY 682 | AUTO_ATN, host, SCNTL0_REG); 683 } else { 684 NCR_700_writeb(BURST_LENGTH_8 | hostdata->dmode_extra, 685 host, DMODE_700_REG); 686 NCR_700_writeb(hostdata->differential ? 687 DIFF : 0, host, CTEST7_REG); 688 if(hostdata->fast) { 689 /* this is for 700-66, does nothing on 700 */ 690 NCR_700_writeb(LAST_DIS_ENBL | ENABLE_ACTIVE_NEGATION 691 | GENERATE_RECEIVE_PARITY, host, 692 CTEST8_REG); 693 } else { 694 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY 695 | PARITY | AUTO_ATN, host, SCNTL0_REG); 696 } 697 } 698 699 NCR_700_writeb(1 << host->this_id, host, SCID_REG); 700 NCR_700_writeb(0, host, SBCL_REG); 701 NCR_700_writeb(ASYNC_OPERATION, host, SXFER_REG); 702 703 NCR_700_writeb(PHASE_MM_INT | SEL_TIMEOUT_INT | GROSS_ERR_INT | UX_DISC_INT 704 | RST_INT | PAR_ERR_INT | SELECT_INT, host, SIEN_REG); 705 706 NCR_700_writeb(ABORT_INT | INT_INST_INT | ILGL_INST_INT, host, DIEN_REG); 707 NCR_700_writeb(ENABLE_SELECT, host, SCNTL1_REG); 708 if(hostdata->clock > 75) { 709 printk(KERN_ERR "53c700: Clock speed %dMHz is too high: 75Mhz is the maximum this chip can be driven at\n", hostdata->clock); 710 /* do the best we can, but the async clock will be out 711 * of spec: sync divider 2, async divider 3 */ 712 DEBUG(("53c700: sync 2 async 3\n")); 713 NCR_700_writeb(SYNC_DIV_2_0, host, SBCL_REG); 714 NCR_700_writeb(ASYNC_DIV_3_0 | dcntl_extra, host, DCNTL_REG); 715 hostdata->sync_clock = hostdata->clock/2; 716 } else if(hostdata->clock > 50 && hostdata->clock <= 75) { 717 /* sync divider 1.5, async divider 3 */ 718 DEBUG(("53c700: sync 1.5 async 3\n")); 719 NCR_700_writeb(SYNC_DIV_1_5, host, SBCL_REG); 720 NCR_700_writeb(ASYNC_DIV_3_0 | dcntl_extra, host, DCNTL_REG); 721 hostdata->sync_clock = hostdata->clock*2; 722 hostdata->sync_clock /= 3; 723 724 } else if(hostdata->clock > 37 && hostdata->clock <= 50) { 725 /* sync divider 1, async divider 2 */ 726 DEBUG(("53c700: sync 1 async 2\n")); 727 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG); 728 NCR_700_writeb(ASYNC_DIV_2_0 | dcntl_extra, host, DCNTL_REG); 729 hostdata->sync_clock = hostdata->clock; 730 } else if(hostdata->clock > 25 && hostdata->clock <=37) { 731 /* sync divider 1, async divider 1.5 */ 732 DEBUG(("53c700: sync 1 async 1.5\n")); 733 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG); 734 NCR_700_writeb(ASYNC_DIV_1_5 | dcntl_extra, host, DCNTL_REG); 735 hostdata->sync_clock = hostdata->clock; 736 } else { 737 DEBUG(("53c700: sync 1 async 1\n")); 738 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG); 739 NCR_700_writeb(ASYNC_DIV_1_0 | dcntl_extra, host, DCNTL_REG); 740 /* sync divider 1, async divider 1 */ 741 hostdata->sync_clock = hostdata->clock; 742 } 743 /* Calculate the actual minimum period that can be supported 744 * by our synchronous clock speed. See the 710 manual for 745 * exact details of this calculation which is based on a 746 * setting of the SXFER register */ 747 min_period = 1000*(4+min_xferp)/(4*hostdata->sync_clock); 748 hostdata->min_period = NCR_700_MIN_PERIOD; 749 if(min_period > NCR_700_MIN_PERIOD) 750 hostdata->min_period = min_period; 751 } 752 753 STATIC void 754 NCR_700_chip_reset(struct Scsi_Host *host) 755 { 756 struct NCR_700_Host_Parameters *hostdata = 757 (struct NCR_700_Host_Parameters *)host->hostdata[0]; 758 if(hostdata->chip710) { 759 NCR_700_writeb(SOFTWARE_RESET_710, host, ISTAT_REG); 760 udelay(100); 761 762 NCR_700_writeb(0, host, ISTAT_REG); 763 } else { 764 NCR_700_writeb(SOFTWARE_RESET, host, DCNTL_REG); 765 udelay(100); 766 767 NCR_700_writeb(0, host, DCNTL_REG); 768 } 769 770 mdelay(1000); 771 772 NCR_700_chip_setup(host); 773 } 774 775 /* The heart of the message processing engine is that the instruction 776 * immediately after the INT is the normal case (and so must be CLEAR 777 * ACK). If we want to do something else, we call that routine in 778 * scripts and set temp to be the normal case + 8 (skipping the CLEAR 779 * ACK) so that the routine returns correctly to resume its activity 780 * */ 781 STATIC __u32 782 process_extended_message(struct Scsi_Host *host, 783 struct NCR_700_Host_Parameters *hostdata, 784 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps) 785 { 786 __u32 resume_offset = dsp, temp = dsp + 8; 787 __u8 pun = 0xff, lun = 0xff; 788 789 if(SCp != NULL) { 790 pun = SCp->device->id; 791 lun = SCp->device->lun; 792 } 793 794 switch(hostdata->msgin[2]) { 795 case A_SDTR_MSG: 796 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) { 797 struct scsi_target *starget = SCp->device->sdev_target; 798 __u8 period = hostdata->msgin[3]; 799 __u8 offset = hostdata->msgin[4]; 800 801 if(offset == 0 || period == 0) { 802 offset = 0; 803 period = 0; 804 } 805 806 spi_offset(starget) = offset; 807 spi_period(starget) = period; 808 809 if(NCR_700_is_flag_set(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION)) { 810 spi_display_xfer_agreement(starget); 811 NCR_700_clear_flag(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION); 812 } 813 814 NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC); 815 NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION); 816 817 NCR_700_writeb(NCR_700_get_SXFER(SCp->device), 818 host, SXFER_REG); 819 820 } else { 821 /* SDTR message out of the blue, reject it */ 822 shost_printk(KERN_WARNING, host, 823 "Unexpected SDTR msg\n"); 824 hostdata->msgout[0] = A_REJECT_MSG; 825 dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE); 826 script_patch_16(hostdata->script, MessageCount, 1); 827 /* SendMsgOut returns, so set up the return 828 * address */ 829 resume_offset = hostdata->pScript + Ent_SendMessageWithATN; 830 } 831 break; 832 833 case A_WDTR_MSG: 834 printk(KERN_INFO "scsi%d: (%d:%d), Unsolicited WDTR after CMD, Rejecting\n", 835 host->host_no, pun, lun); 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 resume_offset = hostdata->pScript + Ent_SendMessageWithATN; 840 841 break; 842 843 default: 844 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ", 845 host->host_no, pun, lun, 846 NCR_700_phase[(dsps & 0xf00) >> 8]); 847 spi_print_msg(hostdata->msgin); 848 printk("\n"); 849 /* just reject it */ 850 hostdata->msgout[0] = A_REJECT_MSG; 851 dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE); 852 script_patch_16(hostdata->script, MessageCount, 1); 853 /* SendMsgOut returns, so set up the return 854 * address */ 855 resume_offset = hostdata->pScript + Ent_SendMessageWithATN; 856 } 857 NCR_700_writel(temp, host, TEMP_REG); 858 return resume_offset; 859 } 860 861 STATIC __u32 862 process_message(struct Scsi_Host *host, struct NCR_700_Host_Parameters *hostdata, 863 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps) 864 { 865 /* work out where to return to */ 866 __u32 temp = dsp + 8, resume_offset = dsp; 867 __u8 pun = 0xff, lun = 0xff; 868 869 if(SCp != NULL) { 870 pun = SCp->device->id; 871 lun = SCp->device->lun; 872 } 873 874 #ifdef NCR_700_DEBUG 875 printk("scsi%d (%d:%d): message %s: ", host->host_no, pun, lun, 876 NCR_700_phase[(dsps & 0xf00) >> 8]); 877 spi_print_msg(hostdata->msgin); 878 printk("\n"); 879 #endif 880 881 switch(hostdata->msgin[0]) { 882 883 case A_EXTENDED_MSG: 884 resume_offset = process_extended_message(host, hostdata, SCp, 885 dsp, dsps); 886 break; 887 888 case A_REJECT_MSG: 889 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) { 890 /* Rejected our sync negotiation attempt */ 891 spi_period(SCp->device->sdev_target) = 892 spi_offset(SCp->device->sdev_target) = 0; 893 NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC); 894 NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION); 895 } else if(SCp != NULL && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION) { 896 /* rejected our first simple tag message */ 897 scmd_printk(KERN_WARNING, SCp, 898 "Rejected first tag queue attempt, turning off tag queueing\n"); 899 /* we're done negotiating */ 900 NCR_700_set_tag_neg_state(SCp->device, NCR_700_FINISHED_TAG_NEGOTIATION); 901 hostdata->tag_negotiated &= ~(1<<scmd_id(SCp)); 902 SCp->device->tagged_supported = 0; 903 scsi_deactivate_tcq(SCp->device, host->cmd_per_lun); 904 } else { 905 shost_printk(KERN_WARNING, host, 906 "(%d:%d) Unexpected REJECT Message %s\n", 907 pun, lun, 908 NCR_700_phase[(dsps & 0xf00) >> 8]); 909 /* however, just ignore it */ 910 } 911 break; 912 913 case A_PARITY_ERROR_MSG: 914 printk(KERN_ERR "scsi%d (%d:%d) Parity Error!\n", host->host_no, 915 pun, lun); 916 NCR_700_internal_bus_reset(host); 917 break; 918 case A_SIMPLE_TAG_MSG: 919 printk(KERN_INFO "scsi%d (%d:%d) SIMPLE TAG %d %s\n", host->host_no, 920 pun, lun, hostdata->msgin[1], 921 NCR_700_phase[(dsps & 0xf00) >> 8]); 922 /* just ignore it */ 923 break; 924 default: 925 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ", 926 host->host_no, pun, lun, 927 NCR_700_phase[(dsps & 0xf00) >> 8]); 928 929 spi_print_msg(hostdata->msgin); 930 printk("\n"); 931 /* just reject it */ 932 hostdata->msgout[0] = A_REJECT_MSG; 933 dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE); 934 script_patch_16(hostdata->script, MessageCount, 1); 935 /* SendMsgOut returns, so set up the return 936 * address */ 937 resume_offset = hostdata->pScript + Ent_SendMessageWithATN; 938 939 break; 940 } 941 NCR_700_writel(temp, host, TEMP_REG); 942 /* set us up to receive another message */ 943 dma_cache_sync(hostdata->msgin, MSG_ARRAY_SIZE, DMA_FROM_DEVICE); 944 return resume_offset; 945 } 946 947 STATIC __u32 948 process_script_interrupt(__u32 dsps, __u32 dsp, struct scsi_cmnd *SCp, 949 struct Scsi_Host *host, 950 struct NCR_700_Host_Parameters *hostdata) 951 { 952 __u32 resume_offset = 0; 953 __u8 pun = 0xff, lun=0xff; 954 955 if(SCp != NULL) { 956 pun = SCp->device->id; 957 lun = SCp->device->lun; 958 } 959 960 if(dsps == A_GOOD_STATUS_AFTER_STATUS) { 961 DEBUG((" COMMAND COMPLETE, status=%02x\n", 962 hostdata->status[0])); 963 /* OK, if TCQ still under negotiation, we now know it works */ 964 if (NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION) 965 NCR_700_set_tag_neg_state(SCp->device, 966 NCR_700_FINISHED_TAG_NEGOTIATION); 967 968 /* check for contingent allegiance contitions */ 969 if(status_byte(hostdata->status[0]) == CHECK_CONDITION || 970 status_byte(hostdata->status[0]) == COMMAND_TERMINATED) { 971 struct NCR_700_command_slot *slot = 972 (struct NCR_700_command_slot *)SCp->host_scribble; 973 if(SCp->cmnd[0] == REQUEST_SENSE) { 974 /* OOPS: bad device, returning another 975 * contingent allegiance condition */ 976 scmd_printk(KERN_ERR, SCp, 977 "broken device is looping in contingent allegiance: ignoring\n"); 978 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]); 979 } else { 980 struct NCR_700_sense *sense = SCp->device->hostdata; 981 #ifdef NCR_DEBUG 982 scsi_print_command(SCp); 983 printk(" cmd %p has status %d, requesting sense\n", 984 SCp, hostdata->status[0]); 985 #endif 986 /* we can destroy the command here 987 * because the contingent allegiance 988 * condition will cause a retry which 989 * will re-copy the command from the 990 * saved data_cmnd. We also unmap any 991 * data associated with the command 992 * here */ 993 NCR_700_unmap(hostdata, SCp, slot); 994 dma_unmap_single(hostdata->dev, slot->pCmd, 995 sizeof(SCp->cmnd), 996 DMA_TO_DEVICE); 997 998 sense->cmnd[0] = REQUEST_SENSE; 999 sense->cmnd[1] = (SCp->device->lun & 0x7) << 5; 1000 sense->cmnd[2] = 0; 1001 sense->cmnd[3] = 0; 1002 sense->cmnd[4] = sizeof(SCp->sense_buffer); 1003 sense->cmnd[5] = 0; 1004 /* Here's a quiet hack: the 1005 * REQUEST_SENSE command is six bytes, 1006 * so store a flag indicating that 1007 * this was an internal sense request 1008 * and the original status at the end 1009 * of the command */ 1010 sense->cmnd[6] = NCR_700_INTERNAL_SENSE_MAGIC; 1011 sense->cmnd[7] = hostdata->status[0]; 1012 slot->pCmd = dma_map_single(hostdata->dev, sense->cmnd, sizeof(sense->cmnd), DMA_TO_DEVICE); 1013 slot->dma_handle = dma_map_single(hostdata->dev, SCp->sense_buffer, sizeof(SCp->sense_buffer), DMA_FROM_DEVICE); 1014 slot->SG[0].ins = bS_to_host(SCRIPT_MOVE_DATA_IN | sizeof(SCp->sense_buffer)); 1015 slot->SG[0].pAddr = bS_to_host(slot->dma_handle); 1016 slot->SG[1].ins = bS_to_host(SCRIPT_RETURN); 1017 slot->SG[1].pAddr = 0; 1018 slot->resume_offset = hostdata->pScript; 1019 dma_cache_sync(slot->SG, sizeof(slot->SG[0])*2, DMA_TO_DEVICE); 1020 dma_cache_sync(SCp->sense_buffer, sizeof(SCp->sense_buffer), DMA_FROM_DEVICE); 1021 1022 /* queue the command for reissue */ 1023 slot->state = NCR_700_SLOT_QUEUED; 1024 slot->flags = NCR_700_FLAG_AUTOSENSE; 1025 hostdata->state = NCR_700_HOST_FREE; 1026 hostdata->cmd = NULL; 1027 } 1028 } else { 1029 // Currently rely on the mid layer evaluation 1030 // of the tag queuing capability 1031 // 1032 //if(status_byte(hostdata->status[0]) == GOOD && 1033 // SCp->cmnd[0] == INQUIRY && SCp->use_sg == 0) { 1034 // /* Piggy back the tag queueing support 1035 // * on this command */ 1036 // dma_sync_single_for_cpu(hostdata->dev, 1037 // slot->dma_handle, 1038 // SCp->request_bufflen, 1039 // DMA_FROM_DEVICE); 1040 // if(((char *)SCp->request_buffer)[7] & 0x02) { 1041 // scmd_printk(KERN_INFO, SCp, 1042 // "Enabling Tag Command Queuing\n"); 1043 // hostdata->tag_negotiated |= (1<<scmd_id(SCp)); 1044 // NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING); 1045 // } else { 1046 // NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING); 1047 // hostdata->tag_negotiated &= ~(1<<scmd_id(SCp)); 1048 // } 1049 //} 1050 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]); 1051 } 1052 } else if((dsps & 0xfffff0f0) == A_UNEXPECTED_PHASE) { 1053 __u8 i = (dsps & 0xf00) >> 8; 1054 1055 scmd_printk(KERN_ERR, SCp, "UNEXPECTED PHASE %s (%s)\n", 1056 NCR_700_phase[i], 1057 sbcl_to_string(NCR_700_readb(host, SBCL_REG))); 1058 scmd_printk(KERN_ERR, SCp, " len = %d, cmd =", 1059 SCp->cmd_len); 1060 scsi_print_command(SCp); 1061 1062 NCR_700_internal_bus_reset(host); 1063 } else if((dsps & 0xfffff000) == A_FATAL) { 1064 int i = (dsps & 0xfff); 1065 1066 printk(KERN_ERR "scsi%d: (%d:%d) FATAL ERROR: %s\n", 1067 host->host_no, pun, lun, NCR_700_fatal_messages[i]); 1068 if(dsps == A_FATAL_ILLEGAL_MSG_LENGTH) { 1069 printk(KERN_ERR " msg begins %02x %02x\n", 1070 hostdata->msgin[0], hostdata->msgin[1]); 1071 } 1072 NCR_700_internal_bus_reset(host); 1073 } else if((dsps & 0xfffff0f0) == A_DISCONNECT) { 1074 #ifdef NCR_700_DEBUG 1075 __u8 i = (dsps & 0xf00) >> 8; 1076 1077 printk("scsi%d: (%d:%d), DISCONNECTED (%d) %s\n", 1078 host->host_no, pun, lun, 1079 i, NCR_700_phase[i]); 1080 #endif 1081 save_for_reselection(hostdata, SCp, dsp); 1082 1083 } else if(dsps == A_RESELECTION_IDENTIFIED) { 1084 __u8 lun; 1085 struct NCR_700_command_slot *slot; 1086 __u8 reselection_id = hostdata->reselection_id; 1087 struct scsi_device *SDp; 1088 1089 lun = hostdata->msgin[0] & 0x1f; 1090 1091 hostdata->reselection_id = 0xff; 1092 DEBUG(("scsi%d: (%d:%d) RESELECTED!\n", 1093 host->host_no, reselection_id, lun)); 1094 /* clear the reselection indicator */ 1095 SDp = __scsi_device_lookup(host, 0, reselection_id, lun); 1096 if(unlikely(SDp == NULL)) { 1097 printk(KERN_ERR "scsi%d: (%d:%d) HAS NO device\n", 1098 host->host_no, reselection_id, lun); 1099 BUG(); 1100 } 1101 if(hostdata->msgin[1] == A_SIMPLE_TAG_MSG) { 1102 struct scsi_cmnd *SCp = scsi_find_tag(SDp, hostdata->msgin[2]); 1103 if(unlikely(SCp == NULL)) { 1104 printk(KERN_ERR "scsi%d: (%d:%d) no saved request for tag %d\n", 1105 host->host_no, reselection_id, lun, hostdata->msgin[2]); 1106 BUG(); 1107 } 1108 1109 slot = (struct NCR_700_command_slot *)SCp->host_scribble; 1110 DDEBUG(KERN_DEBUG, SDp, 1111 "reselection is tag %d, slot %p(%d)\n", 1112 hostdata->msgin[2], slot, slot->tag); 1113 } else { 1114 struct scsi_cmnd *SCp = scsi_find_tag(SDp, SCSI_NO_TAG); 1115 if(unlikely(SCp == NULL)) { 1116 sdev_printk(KERN_ERR, SDp, 1117 "no saved request for untagged cmd\n"); 1118 BUG(); 1119 } 1120 slot = (struct NCR_700_command_slot *)SCp->host_scribble; 1121 } 1122 1123 if(slot == NULL) { 1124 printk(KERN_ERR "scsi%d: (%d:%d) RESELECTED but no saved command (MSG = %02x %02x %02x)!!\n", 1125 host->host_no, reselection_id, lun, 1126 hostdata->msgin[0], hostdata->msgin[1], 1127 hostdata->msgin[2]); 1128 } else { 1129 if(hostdata->state != NCR_700_HOST_BUSY) 1130 printk(KERN_ERR "scsi%d: FATAL, host not busy during valid reselection!\n", 1131 host->host_no); 1132 resume_offset = slot->resume_offset; 1133 hostdata->cmd = slot->cmnd; 1134 1135 /* re-patch for this command */ 1136 script_patch_32_abs(hostdata->script, CommandAddress, 1137 slot->pCmd); 1138 script_patch_16(hostdata->script, 1139 CommandCount, slot->cmnd->cmd_len); 1140 script_patch_32_abs(hostdata->script, SGScriptStartAddress, 1141 to32bit(&slot->pSG[0].ins)); 1142 1143 /* Note: setting SXFER only works if we're 1144 * still in the MESSAGE phase, so it is vital 1145 * that ACK is still asserted when we process 1146 * the reselection message. The resume offset 1147 * should therefore always clear ACK */ 1148 NCR_700_writeb(NCR_700_get_SXFER(hostdata->cmd->device), 1149 host, SXFER_REG); 1150 dma_cache_sync(hostdata->msgin, 1151 MSG_ARRAY_SIZE, DMA_FROM_DEVICE); 1152 dma_cache_sync(hostdata->msgout, 1153 MSG_ARRAY_SIZE, DMA_TO_DEVICE); 1154 /* I'm just being paranoid here, the command should 1155 * already have been flushed from the cache */ 1156 dma_cache_sync(slot->cmnd->cmnd, 1157 slot->cmnd->cmd_len, DMA_TO_DEVICE); 1158 1159 1160 1161 } 1162 } else if(dsps == A_RESELECTED_DURING_SELECTION) { 1163 1164 /* This section is full of debugging code because I've 1165 * never managed to reach it. I think what happens is 1166 * that, because the 700 runs with selection 1167 * interrupts enabled the whole time that we take a 1168 * selection interrupt before we manage to get to the 1169 * reselected script interrupt */ 1170 1171 __u8 reselection_id = NCR_700_readb(host, SFBR_REG); 1172 struct NCR_700_command_slot *slot; 1173 1174 /* Take out our own ID */ 1175 reselection_id &= ~(1<<host->this_id); 1176 1177 /* I've never seen this happen, so keep this as a printk rather 1178 * than a debug */ 1179 printk(KERN_INFO "scsi%d: (%d:%d) RESELECTION DURING SELECTION, dsp=%08x[%04x] state=%d, count=%d\n", 1180 host->host_no, reselection_id, lun, dsp, dsp - hostdata->pScript, hostdata->state, hostdata->command_slot_count); 1181 1182 { 1183 /* FIXME: DEBUGGING CODE */ 1184 __u32 SG = (__u32)bS_to_cpu(hostdata->script[A_SGScriptStartAddress_used[0]]); 1185 int i; 1186 1187 for(i=0; i< NCR_700_COMMAND_SLOTS_PER_HOST; i++) { 1188 if(SG >= to32bit(&hostdata->slots[i].pSG[0]) 1189 && SG <= to32bit(&hostdata->slots[i].pSG[NCR_700_SG_SEGMENTS])) 1190 break; 1191 } 1192 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); 1193 SCp = hostdata->slots[i].cmnd; 1194 } 1195 1196 if(SCp != NULL) { 1197 slot = (struct NCR_700_command_slot *)SCp->host_scribble; 1198 /* change slot from busy to queued to redo command */ 1199 slot->state = NCR_700_SLOT_QUEUED; 1200 } 1201 hostdata->cmd = NULL; 1202 1203 if(reselection_id == 0) { 1204 if(hostdata->reselection_id == 0xff) { 1205 printk(KERN_ERR "scsi%d: Invalid reselection during selection!!\n", host->host_no); 1206 return 0; 1207 } else { 1208 printk(KERN_ERR "scsi%d: script reselected and we took a selection interrupt\n", 1209 host->host_no); 1210 reselection_id = hostdata->reselection_id; 1211 } 1212 } else { 1213 1214 /* convert to real ID */ 1215 reselection_id = bitmap_to_number(reselection_id); 1216 } 1217 hostdata->reselection_id = reselection_id; 1218 /* just in case we have a stale simple tag message, clear it */ 1219 hostdata->msgin[1] = 0; 1220 dma_cache_sync(hostdata->msgin, 1221 MSG_ARRAY_SIZE, DMA_BIDIRECTIONAL); 1222 if(hostdata->tag_negotiated & (1<<reselection_id)) { 1223 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag; 1224 } else { 1225 resume_offset = hostdata->pScript + Ent_GetReselectionData; 1226 } 1227 } else if(dsps == A_COMPLETED_SELECTION_AS_TARGET) { 1228 /* we've just disconnected from the bus, do nothing since 1229 * a return here will re-run the queued command slot 1230 * that may have been interrupted by the initial selection */ 1231 DEBUG((" SELECTION COMPLETED\n")); 1232 } else if((dsps & 0xfffff0f0) == A_MSG_IN) { 1233 resume_offset = process_message(host, hostdata, SCp, 1234 dsp, dsps); 1235 } else if((dsps & 0xfffff000) == 0) { 1236 __u8 i = (dsps & 0xf0) >> 4, j = (dsps & 0xf00) >> 8; 1237 printk(KERN_ERR "scsi%d: (%d:%d), unhandled script condition %s %s at %04x\n", 1238 host->host_no, pun, lun, NCR_700_condition[i], 1239 NCR_700_phase[j], dsp - hostdata->pScript); 1240 if(SCp != NULL) { 1241 scsi_print_command(SCp); 1242 1243 if(SCp->use_sg) { 1244 for(i = 0; i < SCp->use_sg + 1; i++) { 1245 printk(KERN_INFO " SG[%d].length = %d, move_insn=%08x, addr %08x\n", i, ((struct scatterlist *)SCp->request_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); 1246 } 1247 } 1248 } 1249 NCR_700_internal_bus_reset(host); 1250 } else if((dsps & 0xfffff000) == A_DEBUG_INTERRUPT) { 1251 printk(KERN_NOTICE "scsi%d (%d:%d) DEBUG INTERRUPT %d AT %08x[%04x], continuing\n", 1252 host->host_no, pun, lun, dsps & 0xfff, dsp, dsp - hostdata->pScript); 1253 resume_offset = dsp; 1254 } else { 1255 printk(KERN_ERR "scsi%d: (%d:%d), unidentified script interrupt 0x%x at %04x\n", 1256 host->host_no, pun, lun, dsps, dsp - hostdata->pScript); 1257 NCR_700_internal_bus_reset(host); 1258 } 1259 return resume_offset; 1260 } 1261 1262 /* We run the 53c700 with selection interrupts always enabled. This 1263 * means that the chip may be selected as soon as the bus frees. On a 1264 * busy bus, this can be before the scripts engine finishes its 1265 * processing. Therefore, part of the selection processing has to be 1266 * to find out what the scripts engine is doing and complete the 1267 * function if necessary (i.e. process the pending disconnect or save 1268 * the interrupted initial selection */ 1269 STATIC inline __u32 1270 process_selection(struct Scsi_Host *host, __u32 dsp) 1271 { 1272 __u8 id = 0; /* Squash compiler warning */ 1273 int count = 0; 1274 __u32 resume_offset = 0; 1275 struct NCR_700_Host_Parameters *hostdata = 1276 (struct NCR_700_Host_Parameters *)host->hostdata[0]; 1277 struct scsi_cmnd *SCp = hostdata->cmd; 1278 __u8 sbcl; 1279 1280 for(count = 0; count < 5; count++) { 1281 id = NCR_700_readb(host, hostdata->chip710 ? 1282 CTEST9_REG : SFBR_REG); 1283 1284 /* Take out our own ID */ 1285 id &= ~(1<<host->this_id); 1286 if(id != 0) 1287 break; 1288 udelay(5); 1289 } 1290 sbcl = NCR_700_readb(host, SBCL_REG); 1291 if((sbcl & SBCL_IO) == 0) { 1292 /* mark as having been selected rather than reselected */ 1293 id = 0xff; 1294 } else { 1295 /* convert to real ID */ 1296 hostdata->reselection_id = id = bitmap_to_number(id); 1297 DEBUG(("scsi%d: Reselected by %d\n", 1298 host->host_no, id)); 1299 } 1300 if(hostdata->state == NCR_700_HOST_BUSY && SCp != NULL) { 1301 struct NCR_700_command_slot *slot = 1302 (struct NCR_700_command_slot *)SCp->host_scribble; 1303 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)); 1304 1305 switch(dsp - hostdata->pScript) { 1306 case Ent_Disconnect1: 1307 case Ent_Disconnect2: 1308 save_for_reselection(hostdata, SCp, Ent_Disconnect2 + hostdata->pScript); 1309 break; 1310 case Ent_Disconnect3: 1311 case Ent_Disconnect4: 1312 save_for_reselection(hostdata, SCp, Ent_Disconnect4 + hostdata->pScript); 1313 break; 1314 case Ent_Disconnect5: 1315 case Ent_Disconnect6: 1316 save_for_reselection(hostdata, SCp, Ent_Disconnect6 + hostdata->pScript); 1317 break; 1318 case Ent_Disconnect7: 1319 case Ent_Disconnect8: 1320 save_for_reselection(hostdata, SCp, Ent_Disconnect8 + hostdata->pScript); 1321 break; 1322 case Ent_Finish1: 1323 case Ent_Finish2: 1324 process_script_interrupt(A_GOOD_STATUS_AFTER_STATUS, dsp, SCp, host, hostdata); 1325 break; 1326 1327 default: 1328 slot->state = NCR_700_SLOT_QUEUED; 1329 break; 1330 } 1331 } 1332 hostdata->state = NCR_700_HOST_BUSY; 1333 hostdata->cmd = NULL; 1334 /* clear any stale simple tag message */ 1335 hostdata->msgin[1] = 0; 1336 dma_cache_sync(hostdata->msgin, MSG_ARRAY_SIZE, 1337 DMA_BIDIRECTIONAL); 1338 1339 if(id == 0xff) { 1340 /* Selected as target, Ignore */ 1341 resume_offset = hostdata->pScript + Ent_SelectedAsTarget; 1342 } else if(hostdata->tag_negotiated & (1<<id)) { 1343 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag; 1344 } else { 1345 resume_offset = hostdata->pScript + Ent_GetReselectionData; 1346 } 1347 return resume_offset; 1348 } 1349 1350 static inline void 1351 NCR_700_clear_fifo(struct Scsi_Host *host) { 1352 const struct NCR_700_Host_Parameters *hostdata 1353 = (struct NCR_700_Host_Parameters *)host->hostdata[0]; 1354 if(hostdata->chip710) { 1355 NCR_700_writeb(CLR_FIFO_710, host, CTEST8_REG); 1356 } else { 1357 NCR_700_writeb(CLR_FIFO, host, DFIFO_REG); 1358 } 1359 } 1360 1361 static inline void 1362 NCR_700_flush_fifo(struct Scsi_Host *host) { 1363 const struct NCR_700_Host_Parameters *hostdata 1364 = (struct NCR_700_Host_Parameters *)host->hostdata[0]; 1365 if(hostdata->chip710) { 1366 NCR_700_writeb(FLUSH_DMA_FIFO_710, host, CTEST8_REG); 1367 udelay(10); 1368 NCR_700_writeb(0, host, CTEST8_REG); 1369 } else { 1370 NCR_700_writeb(FLUSH_DMA_FIFO, host, DFIFO_REG); 1371 udelay(10); 1372 NCR_700_writeb(0, host, DFIFO_REG); 1373 } 1374 } 1375 1376 1377 /* The queue lock with interrupts disabled must be held on entry to 1378 * this function */ 1379 STATIC int 1380 NCR_700_start_command(struct scsi_cmnd *SCp) 1381 { 1382 struct NCR_700_command_slot *slot = 1383 (struct NCR_700_command_slot *)SCp->host_scribble; 1384 struct NCR_700_Host_Parameters *hostdata = 1385 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0]; 1386 __u16 count = 1; /* for IDENTIFY message */ 1387 1388 if(hostdata->state != NCR_700_HOST_FREE) { 1389 /* keep this inside the lock to close the race window where 1390 * the running command finishes on another CPU while we don't 1391 * change the state to queued on this one */ 1392 slot->state = NCR_700_SLOT_QUEUED; 1393 1394 DEBUG(("scsi%d: host busy, queueing command %p, slot %p\n", 1395 SCp->device->host->host_no, slot->cmnd, slot)); 1396 return 0; 1397 } 1398 hostdata->state = NCR_700_HOST_BUSY; 1399 hostdata->cmd = SCp; 1400 slot->state = NCR_700_SLOT_BUSY; 1401 /* keep interrupts disabled until we have the command correctly 1402 * set up so we cannot take a selection interrupt */ 1403 1404 hostdata->msgout[0] = NCR_700_identify((SCp->cmnd[0] != REQUEST_SENSE && 1405 slot->flags != NCR_700_FLAG_AUTOSENSE), 1406 SCp->device->lun); 1407 /* for INQUIRY or REQUEST_SENSE commands, we cannot be sure 1408 * if the negotiated transfer parameters still hold, so 1409 * always renegotiate them */ 1410 if(SCp->cmnd[0] == INQUIRY || SCp->cmnd[0] == REQUEST_SENSE || 1411 slot->flags == NCR_700_FLAG_AUTOSENSE) { 1412 NCR_700_clear_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC); 1413 } 1414 1415 /* REQUEST_SENSE is asking for contingent I_T_L(_Q) status. 1416 * If a contingent allegiance condition exists, the device 1417 * will refuse all tags, so send the request sense as untagged 1418 * */ 1419 if((hostdata->tag_negotiated & (1<<scmd_id(SCp))) 1420 && (slot->tag != SCSI_NO_TAG && SCp->cmnd[0] != REQUEST_SENSE && 1421 slot->flags != NCR_700_FLAG_AUTOSENSE)) { 1422 count += scsi_populate_tag_msg(SCp, &hostdata->msgout[count]); 1423 } 1424 1425 if(hostdata->fast && 1426 NCR_700_is_flag_clear(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC)) { 1427 count += spi_populate_sync_msg(&hostdata->msgout[count], 1428 spi_period(SCp->device->sdev_target), 1429 spi_offset(SCp->device->sdev_target)); 1430 NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION); 1431 } 1432 1433 script_patch_16(hostdata->script, MessageCount, count); 1434 1435 1436 script_patch_ID(hostdata->script, 1437 Device_ID, 1<<scmd_id(SCp)); 1438 1439 script_patch_32_abs(hostdata->script, CommandAddress, 1440 slot->pCmd); 1441 script_patch_16(hostdata->script, CommandCount, SCp->cmd_len); 1442 /* finally plumb the beginning of the SG list into the script 1443 * */ 1444 script_patch_32_abs(hostdata->script, SGScriptStartAddress, 1445 to32bit(&slot->pSG[0].ins)); 1446 NCR_700_clear_fifo(SCp->device->host); 1447 1448 if(slot->resume_offset == 0) 1449 slot->resume_offset = hostdata->pScript; 1450 /* now perform all the writebacks and invalidates */ 1451 dma_cache_sync(hostdata->msgout, count, DMA_TO_DEVICE); 1452 dma_cache_sync(hostdata->msgin, MSG_ARRAY_SIZE, 1453 DMA_FROM_DEVICE); 1454 dma_cache_sync(SCp->cmnd, SCp->cmd_len, DMA_TO_DEVICE); 1455 dma_cache_sync(hostdata->status, 1, DMA_FROM_DEVICE); 1456 1457 /* set the synchronous period/offset */ 1458 NCR_700_writeb(NCR_700_get_SXFER(SCp->device), 1459 SCp->device->host, SXFER_REG); 1460 NCR_700_writel(slot->temp, SCp->device->host, TEMP_REG); 1461 NCR_700_writel(slot->resume_offset, SCp->device->host, DSP_REG); 1462 1463 return 1; 1464 } 1465 1466 irqreturn_t 1467 NCR_700_intr(int irq, void *dev_id, struct pt_regs *regs) 1468 { 1469 struct Scsi_Host *host = (struct Scsi_Host *)dev_id; 1470 struct NCR_700_Host_Parameters *hostdata = 1471 (struct NCR_700_Host_Parameters *)host->hostdata[0]; 1472 __u8 istat; 1473 __u32 resume_offset = 0; 1474 __u8 pun = 0xff, lun = 0xff; 1475 unsigned long flags; 1476 int handled = 0; 1477 1478 /* Use the host lock to serialise acess to the 53c700 1479 * hardware. Note: In future, we may need to take the queue 1480 * lock to enter the done routines. When that happens, we 1481 * need to ensure that for this driver, the host lock and the 1482 * queue lock point to the same thing. */ 1483 spin_lock_irqsave(host->host_lock, flags); 1484 if((istat = NCR_700_readb(host, ISTAT_REG)) 1485 & (SCSI_INT_PENDING | DMA_INT_PENDING)) { 1486 __u32 dsps; 1487 __u8 sstat0 = 0, dstat = 0; 1488 __u32 dsp; 1489 struct scsi_cmnd *SCp = hostdata->cmd; 1490 enum NCR_700_Host_State state; 1491 1492 handled = 1; 1493 state = hostdata->state; 1494 SCp = hostdata->cmd; 1495 1496 if(istat & SCSI_INT_PENDING) { 1497 udelay(10); 1498 1499 sstat0 = NCR_700_readb(host, SSTAT0_REG); 1500 } 1501 1502 if(istat & DMA_INT_PENDING) { 1503 udelay(10); 1504 1505 dstat = NCR_700_readb(host, DSTAT_REG); 1506 } 1507 1508 dsps = NCR_700_readl(host, DSPS_REG); 1509 dsp = NCR_700_readl(host, DSP_REG); 1510 1511 DEBUG(("scsi%d: istat %02x sstat0 %02x dstat %02x dsp %04x[%08x] dsps 0x%x\n", 1512 host->host_no, istat, sstat0, dstat, 1513 (dsp - (__u32)(hostdata->pScript))/4, 1514 dsp, dsps)); 1515 1516 if(SCp != NULL) { 1517 pun = SCp->device->id; 1518 lun = SCp->device->lun; 1519 } 1520 1521 if(sstat0 & SCSI_RESET_DETECTED) { 1522 struct scsi_device *SDp; 1523 int i; 1524 1525 hostdata->state = NCR_700_HOST_BUSY; 1526 1527 printk(KERN_ERR "scsi%d: Bus Reset detected, executing command %p, slot %p, dsp %08x[%04x]\n", 1528 host->host_no, SCp, SCp == NULL ? NULL : SCp->host_scribble, dsp, dsp - hostdata->pScript); 1529 1530 scsi_report_bus_reset(host, 0); 1531 1532 /* clear all the negotiated parameters */ 1533 __shost_for_each_device(SDp, host) 1534 SDp->hostdata = NULL; 1535 1536 /* clear all the slots and their pending commands */ 1537 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) { 1538 struct scsi_cmnd *SCp; 1539 struct NCR_700_command_slot *slot = 1540 &hostdata->slots[i]; 1541 1542 if(slot->state == NCR_700_SLOT_FREE) 1543 continue; 1544 1545 SCp = slot->cmnd; 1546 printk(KERN_ERR " failing command because of reset, slot %p, cmnd %p\n", 1547 slot, SCp); 1548 free_slot(slot, hostdata); 1549 SCp->host_scribble = NULL; 1550 NCR_700_set_depth(SCp->device, 0); 1551 /* NOTE: deadlock potential here: we 1552 * rely on mid-layer guarantees that 1553 * scsi_done won't try to issue the 1554 * command again otherwise we'll 1555 * deadlock on the 1556 * hostdata->state_lock */ 1557 SCp->result = DID_RESET << 16; 1558 SCp->scsi_done(SCp); 1559 } 1560 mdelay(25); 1561 NCR_700_chip_setup(host); 1562 1563 hostdata->state = NCR_700_HOST_FREE; 1564 hostdata->cmd = NULL; 1565 /* signal back if this was an eh induced reset */ 1566 if(hostdata->eh_complete != NULL) 1567 complete(hostdata->eh_complete); 1568 goto out_unlock; 1569 } else if(sstat0 & SELECTION_TIMEOUT) { 1570 DEBUG(("scsi%d: (%d:%d) selection timeout\n", 1571 host->host_no, pun, lun)); 1572 NCR_700_scsi_done(hostdata, SCp, DID_NO_CONNECT<<16); 1573 } else if(sstat0 & PHASE_MISMATCH) { 1574 struct NCR_700_command_slot *slot = (SCp == NULL) ? NULL : 1575 (struct NCR_700_command_slot *)SCp->host_scribble; 1576 1577 if(dsp == Ent_SendMessage + 8 + hostdata->pScript) { 1578 /* It wants to reply to some part of 1579 * our message */ 1580 #ifdef NCR_700_DEBUG 1581 __u32 temp = NCR_700_readl(host, TEMP_REG); 1582 int count = (hostdata->script[Ent_SendMessage/4] & 0xffffff) - ((NCR_700_readl(host, DBC_REG) & 0xffffff) + NCR_700_data_residual(host)); 1583 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))); 1584 #endif 1585 resume_offset = hostdata->pScript + Ent_SendMessagePhaseMismatch; 1586 } else if(dsp >= to32bit(&slot->pSG[0].ins) && 1587 dsp <= to32bit(&slot->pSG[NCR_700_SG_SEGMENTS].ins)) { 1588 int data_transfer = NCR_700_readl(host, DBC_REG) & 0xffffff; 1589 int SGcount = (dsp - to32bit(&slot->pSG[0].ins))/sizeof(struct NCR_700_SG_List); 1590 int residual = NCR_700_data_residual(host); 1591 int i; 1592 #ifdef NCR_700_DEBUG 1593 __u32 naddr = NCR_700_readl(host, DNAD_REG); 1594 1595 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x\n", 1596 host->host_no, pun, lun, 1597 SGcount, data_transfer); 1598 scsi_print_command(SCp); 1599 if(residual) { 1600 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x, residual %d\n", 1601 host->host_no, pun, lun, 1602 SGcount, data_transfer, residual); 1603 } 1604 #endif 1605 data_transfer += residual; 1606 1607 if(data_transfer != 0) { 1608 int count; 1609 __u32 pAddr; 1610 1611 SGcount--; 1612 1613 count = (bS_to_cpu(slot->SG[SGcount].ins) & 0x00ffffff); 1614 DEBUG(("DATA TRANSFER MISMATCH, count = %d, transferred %d\n", count, count-data_transfer)); 1615 slot->SG[SGcount].ins &= bS_to_host(0xff000000); 1616 slot->SG[SGcount].ins |= bS_to_host(data_transfer); 1617 pAddr = bS_to_cpu(slot->SG[SGcount].pAddr); 1618 pAddr += (count - data_transfer); 1619 #ifdef NCR_700_DEBUG 1620 if(pAddr != naddr) { 1621 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); 1622 } 1623 #endif 1624 slot->SG[SGcount].pAddr = bS_to_host(pAddr); 1625 } 1626 /* set the executed moves to nops */ 1627 for(i=0; i<SGcount; i++) { 1628 slot->SG[i].ins = bS_to_host(SCRIPT_NOP); 1629 slot->SG[i].pAddr = 0; 1630 } 1631 dma_cache_sync(slot->SG, sizeof(slot->SG), DMA_TO_DEVICE); 1632 /* and pretend we disconnected after 1633 * the command phase */ 1634 resume_offset = hostdata->pScript + Ent_MsgInDuringData; 1635 /* make sure all the data is flushed */ 1636 NCR_700_flush_fifo(host); 1637 } else { 1638 __u8 sbcl = NCR_700_readb(host, SBCL_REG); 1639 printk(KERN_ERR "scsi%d: (%d:%d) phase mismatch at %04x, phase %s\n", 1640 host->host_no, pun, lun, dsp - hostdata->pScript, sbcl_to_string(sbcl)); 1641 NCR_700_internal_bus_reset(host); 1642 } 1643 1644 } else if(sstat0 & SCSI_GROSS_ERROR) { 1645 printk(KERN_ERR "scsi%d: (%d:%d) GROSS ERROR\n", 1646 host->host_no, pun, lun); 1647 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16); 1648 } else if(sstat0 & PARITY_ERROR) { 1649 printk(KERN_ERR "scsi%d: (%d:%d) PARITY ERROR\n", 1650 host->host_no, pun, lun); 1651 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16); 1652 } else if(dstat & SCRIPT_INT_RECEIVED) { 1653 DEBUG(("scsi%d: (%d:%d) ====>SCRIPT INTERRUPT<====\n", 1654 host->host_no, pun, lun)); 1655 resume_offset = process_script_interrupt(dsps, dsp, SCp, host, hostdata); 1656 } else if(dstat & (ILGL_INST_DETECTED)) { 1657 printk(KERN_ERR "scsi%d: (%d:%d) Illegal Instruction detected at 0x%08x[0x%x]!!!\n" 1658 " Please email James.Bottomley@HansenPartnership.com with the details\n", 1659 host->host_no, pun, lun, 1660 dsp, dsp - hostdata->pScript); 1661 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16); 1662 } else if(dstat & (WATCH_DOG_INTERRUPT|ABORTED)) { 1663 printk(KERN_ERR "scsi%d: (%d:%d) serious DMA problem, dstat=%02x\n", 1664 host->host_no, pun, lun, dstat); 1665 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16); 1666 } 1667 1668 1669 /* NOTE: selection interrupt processing MUST occur 1670 * after script interrupt processing to correctly cope 1671 * with the case where we process a disconnect and 1672 * then get reselected before we process the 1673 * disconnection */ 1674 if(sstat0 & SELECTED) { 1675 /* FIXME: It currently takes at least FOUR 1676 * interrupts to complete a command that 1677 * disconnects: one for the disconnect, one 1678 * for the reselection, one to get the 1679 * reselection data and one to complete the 1680 * command. If we guess the reselected 1681 * command here and prepare it, we only need 1682 * to get a reselection data interrupt if we 1683 * guessed wrongly. Since the interrupt 1684 * overhead is much greater than the command 1685 * setup, this would be an efficient 1686 * optimisation particularly as we probably 1687 * only have one outstanding command on a 1688 * target most of the time */ 1689 1690 resume_offset = process_selection(host, dsp); 1691 1692 } 1693 1694 } 1695 1696 if(resume_offset) { 1697 if(hostdata->state != NCR_700_HOST_BUSY) { 1698 printk(KERN_ERR "scsi%d: Driver error: resume at 0x%08x [0x%04x] with non busy host!\n", 1699 host->host_no, resume_offset, resume_offset - hostdata->pScript); 1700 hostdata->state = NCR_700_HOST_BUSY; 1701 } 1702 1703 DEBUG(("Attempting to resume at %x\n", resume_offset)); 1704 NCR_700_clear_fifo(host); 1705 NCR_700_writel(resume_offset, host, DSP_REG); 1706 } 1707 /* There is probably a technical no-no about this: If we're a 1708 * shared interrupt and we got this interrupt because the 1709 * other device needs servicing not us, we're still going to 1710 * check our queued commands here---of course, there shouldn't 1711 * be any outstanding.... */ 1712 if(hostdata->state == NCR_700_HOST_FREE) { 1713 int i; 1714 1715 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) { 1716 /* fairness: always run the queue from the last 1717 * position we left off */ 1718 int j = (i + hostdata->saved_slot_position) 1719 % NCR_700_COMMAND_SLOTS_PER_HOST; 1720 1721 if(hostdata->slots[j].state != NCR_700_SLOT_QUEUED) 1722 continue; 1723 if(NCR_700_start_command(hostdata->slots[j].cmnd)) { 1724 DEBUG(("scsi%d: Issuing saved command slot %p, cmd %p\t\n", 1725 host->host_no, &hostdata->slots[j], 1726 hostdata->slots[j].cmnd)); 1727 hostdata->saved_slot_position = j + 1; 1728 } 1729 1730 break; 1731 } 1732 } 1733 out_unlock: 1734 spin_unlock_irqrestore(host->host_lock, flags); 1735 return IRQ_RETVAL(handled); 1736 } 1737 1738 STATIC int 1739 NCR_700_queuecommand(struct scsi_cmnd *SCp, void (*done)(struct scsi_cmnd *)) 1740 { 1741 struct NCR_700_Host_Parameters *hostdata = 1742 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0]; 1743 __u32 move_ins; 1744 enum dma_data_direction direction; 1745 struct NCR_700_command_slot *slot; 1746 1747 if(hostdata->command_slot_count >= NCR_700_COMMAND_SLOTS_PER_HOST) { 1748 /* We're over our allocation, this should never happen 1749 * since we report the max allocation to the mid layer */ 1750 printk(KERN_WARNING "scsi%d: Command depth has gone over queue depth\n", SCp->device->host->host_no); 1751 return 1; 1752 } 1753 /* check for untagged commands. We cannot have any outstanding 1754 * commands if we accept them. Commands could be untagged because: 1755 * 1756 * - The tag negotiated bitmap is clear 1757 * - The blk layer sent and untagged command 1758 */ 1759 if(NCR_700_get_depth(SCp->device) != 0 1760 && (!(hostdata->tag_negotiated & (1<<scmd_id(SCp))) 1761 || !blk_rq_tagged(SCp->request))) { 1762 CDEBUG(KERN_ERR, SCp, "has non zero depth %d\n", 1763 NCR_700_get_depth(SCp->device)); 1764 return SCSI_MLQUEUE_DEVICE_BUSY; 1765 } 1766 if(NCR_700_get_depth(SCp->device) >= SCp->device->queue_depth) { 1767 CDEBUG(KERN_ERR, SCp, "has max tag depth %d\n", 1768 NCR_700_get_depth(SCp->device)); 1769 return SCSI_MLQUEUE_DEVICE_BUSY; 1770 } 1771 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) + 1); 1772 1773 /* begin the command here */ 1774 /* no need to check for NULL, test for command_slot_count above 1775 * ensures a slot is free */ 1776 slot = find_empty_slot(hostdata); 1777 1778 slot->cmnd = SCp; 1779 1780 SCp->scsi_done = done; 1781 SCp->host_scribble = (unsigned char *)slot; 1782 SCp->SCp.ptr = NULL; 1783 SCp->SCp.buffer = NULL; 1784 1785 #ifdef NCR_700_DEBUG 1786 printk("53c700: scsi%d, command ", SCp->device->host->host_no); 1787 scsi_print_command(SCp); 1788 #endif 1789 if(blk_rq_tagged(SCp->request) 1790 && (hostdata->tag_negotiated &(1<<scmd_id(SCp))) == 0 1791 && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_START_TAG_NEGOTIATION) { 1792 scmd_printk(KERN_ERR, SCp, "Enabling Tag Command Queuing\n"); 1793 hostdata->tag_negotiated |= (1<<scmd_id(SCp)); 1794 NCR_700_set_tag_neg_state(SCp->device, NCR_700_DURING_TAG_NEGOTIATION); 1795 } 1796 1797 /* here we may have to process an untagged command. The gate 1798 * above ensures that this will be the only one outstanding, 1799 * so clear the tag negotiated bit. 1800 * 1801 * FIXME: This will royally screw up on multiple LUN devices 1802 * */ 1803 if(!blk_rq_tagged(SCp->request) 1804 && (hostdata->tag_negotiated &(1<<scmd_id(SCp)))) { 1805 scmd_printk(KERN_INFO, SCp, "Disabling Tag Command Queuing\n"); 1806 hostdata->tag_negotiated &= ~(1<<scmd_id(SCp)); 1807 } 1808 1809 if((hostdata->tag_negotiated &(1<<scmd_id(SCp))) 1810 && scsi_get_tag_type(SCp->device)) { 1811 slot->tag = SCp->request->tag; 1812 CDEBUG(KERN_DEBUG, SCp, "sending out tag %d, slot %p\n", 1813 slot->tag, slot); 1814 } else { 1815 slot->tag = SCSI_NO_TAG; 1816 /* must populate current_cmnd for scsi_find_tag to work */ 1817 SCp->device->current_cmnd = SCp; 1818 } 1819 /* sanity check: some of the commands generated by the mid-layer 1820 * have an eccentric idea of their sc_data_direction */ 1821 if(!SCp->use_sg && !SCp->request_bufflen 1822 && SCp->sc_data_direction != DMA_NONE) { 1823 #ifdef NCR_700_DEBUG 1824 printk("53c700: Command"); 1825 scsi_print_command(SCp); 1826 printk("Has wrong data direction %d\n", SCp->sc_data_direction); 1827 #endif 1828 SCp->sc_data_direction = DMA_NONE; 1829 } 1830 1831 switch (SCp->cmnd[0]) { 1832 case REQUEST_SENSE: 1833 /* clear the internal sense magic */ 1834 SCp->cmnd[6] = 0; 1835 /* fall through */ 1836 default: 1837 /* OK, get it from the command */ 1838 switch(SCp->sc_data_direction) { 1839 case DMA_BIDIRECTIONAL: 1840 default: 1841 printk(KERN_ERR "53c700: Unknown command for data direction "); 1842 scsi_print_command(SCp); 1843 1844 move_ins = 0; 1845 break; 1846 case DMA_NONE: 1847 move_ins = 0; 1848 break; 1849 case DMA_FROM_DEVICE: 1850 move_ins = SCRIPT_MOVE_DATA_IN; 1851 break; 1852 case DMA_TO_DEVICE: 1853 move_ins = SCRIPT_MOVE_DATA_OUT; 1854 break; 1855 } 1856 } 1857 1858 /* now build the scatter gather list */ 1859 direction = SCp->sc_data_direction; 1860 if(move_ins != 0) { 1861 int i; 1862 int sg_count; 1863 dma_addr_t vPtr = 0; 1864 __u32 count = 0; 1865 1866 if(SCp->use_sg) { 1867 sg_count = dma_map_sg(hostdata->dev, 1868 SCp->request_buffer, SCp->use_sg, 1869 direction); 1870 } else { 1871 vPtr = dma_map_single(hostdata->dev, 1872 SCp->request_buffer, 1873 SCp->request_bufflen, 1874 direction); 1875 count = SCp->request_bufflen; 1876 slot->dma_handle = vPtr; 1877 sg_count = 1; 1878 } 1879 1880 1881 for(i = 0; i < sg_count; i++) { 1882 1883 if(SCp->use_sg) { 1884 struct scatterlist *sg = SCp->request_buffer; 1885 1886 vPtr = sg_dma_address(&sg[i]); 1887 count = sg_dma_len(&sg[i]); 1888 } 1889 1890 slot->SG[i].ins = bS_to_host(move_ins | count); 1891 DEBUG((" scatter block %d: move %d[%08x] from 0x%lx\n", 1892 i, count, slot->SG[i].ins, (unsigned long)vPtr)); 1893 slot->SG[i].pAddr = bS_to_host(vPtr); 1894 } 1895 slot->SG[i].ins = bS_to_host(SCRIPT_RETURN); 1896 slot->SG[i].pAddr = 0; 1897 dma_cache_sync(slot->SG, sizeof(slot->SG), DMA_TO_DEVICE); 1898 DEBUG((" SETTING %08lx to %x\n", 1899 (&slot->pSG[i].ins), 1900 slot->SG[i].ins)); 1901 } 1902 slot->resume_offset = 0; 1903 slot->pCmd = dma_map_single(hostdata->dev, SCp->cmnd, 1904 sizeof(SCp->cmnd), DMA_TO_DEVICE); 1905 NCR_700_start_command(SCp); 1906 return 0; 1907 } 1908 1909 STATIC int 1910 NCR_700_abort(struct scsi_cmnd * SCp) 1911 { 1912 struct NCR_700_command_slot *slot; 1913 1914 scmd_printk(KERN_INFO, SCp, 1915 "New error handler wants to abort command\n\t"); 1916 scsi_print_command(SCp); 1917 1918 slot = (struct NCR_700_command_slot *)SCp->host_scribble; 1919 1920 if(slot == NULL) 1921 /* no outstanding command to abort */ 1922 return SUCCESS; 1923 if(SCp->cmnd[0] == TEST_UNIT_READY) { 1924 /* FIXME: This is because of a problem in the new 1925 * error handler. When it is in error recovery, it 1926 * will send a TUR to a device it thinks may still be 1927 * showing a problem. If the TUR isn't responded to, 1928 * it will abort it and mark the device off line. 1929 * Unfortunately, it does no other error recovery, so 1930 * this would leave us with an outstanding command 1931 * occupying a slot. Rather than allow this to 1932 * happen, we issue a bus reset to force all 1933 * outstanding commands to terminate here. */ 1934 NCR_700_internal_bus_reset(SCp->device->host); 1935 /* still drop through and return failed */ 1936 } 1937 return FAILED; 1938 1939 } 1940 1941 STATIC int 1942 NCR_700_bus_reset(struct scsi_cmnd * SCp) 1943 { 1944 DECLARE_COMPLETION(complete); 1945 struct NCR_700_Host_Parameters *hostdata = 1946 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0]; 1947 1948 scmd_printk(KERN_INFO, SCp, 1949 "New error handler wants BUS reset, cmd %p\n\t", SCp); 1950 scsi_print_command(SCp); 1951 1952 /* In theory, eh_complete should always be null because the 1953 * eh is single threaded, but just in case we're handling a 1954 * reset via sg or something */ 1955 spin_lock_irq(SCp->device->host->host_lock); 1956 while (hostdata->eh_complete != NULL) { 1957 spin_unlock_irq(SCp->device->host->host_lock); 1958 msleep_interruptible(100); 1959 spin_lock_irq(SCp->device->host->host_lock); 1960 } 1961 1962 hostdata->eh_complete = &complete; 1963 NCR_700_internal_bus_reset(SCp->device->host); 1964 1965 spin_unlock_irq(SCp->device->host->host_lock); 1966 wait_for_completion(&complete); 1967 spin_lock_irq(SCp->device->host->host_lock); 1968 1969 hostdata->eh_complete = NULL; 1970 /* Revalidate the transport parameters of the failing device */ 1971 if(hostdata->fast) 1972 spi_schedule_dv_device(SCp->device); 1973 1974 spin_unlock_irq(SCp->device->host->host_lock); 1975 return SUCCESS; 1976 } 1977 1978 STATIC int 1979 NCR_700_host_reset(struct scsi_cmnd * SCp) 1980 { 1981 scmd_printk(KERN_INFO, SCp, "New error handler wants HOST reset\n\t"); 1982 scsi_print_command(SCp); 1983 1984 spin_lock_irq(SCp->device->host->host_lock); 1985 1986 NCR_700_internal_bus_reset(SCp->device->host); 1987 NCR_700_chip_reset(SCp->device->host); 1988 1989 spin_unlock_irq(SCp->device->host->host_lock); 1990 1991 return SUCCESS; 1992 } 1993 1994 STATIC void 1995 NCR_700_set_period(struct scsi_target *STp, int period) 1996 { 1997 struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent); 1998 struct NCR_700_Host_Parameters *hostdata = 1999 (struct NCR_700_Host_Parameters *)SHp->hostdata[0]; 2000 2001 if(!hostdata->fast) 2002 return; 2003 2004 if(period < hostdata->min_period) 2005 period = hostdata->min_period; 2006 2007 spi_period(STp) = period; 2008 spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC | 2009 NCR_700_DEV_BEGIN_SYNC_NEGOTIATION); 2010 spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION; 2011 } 2012 2013 STATIC void 2014 NCR_700_set_offset(struct scsi_target *STp, int offset) 2015 { 2016 struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent); 2017 struct NCR_700_Host_Parameters *hostdata = 2018 (struct NCR_700_Host_Parameters *)SHp->hostdata[0]; 2019 int max_offset = hostdata->chip710 2020 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET; 2021 2022 if(!hostdata->fast) 2023 return; 2024 2025 if(offset > max_offset) 2026 offset = max_offset; 2027 2028 /* if we're currently async, make sure the period is reasonable */ 2029 if(spi_offset(STp) == 0 && (spi_period(STp) < hostdata->min_period || 2030 spi_period(STp) > 0xff)) 2031 spi_period(STp) = hostdata->min_period; 2032 2033 spi_offset(STp) = offset; 2034 spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC | 2035 NCR_700_DEV_BEGIN_SYNC_NEGOTIATION); 2036 spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION; 2037 } 2038 2039 2040 2041 STATIC int 2042 NCR_700_slave_configure(struct scsi_device *SDp) 2043 { 2044 struct NCR_700_Host_Parameters *hostdata = 2045 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0]; 2046 2047 SDp->hostdata = kmalloc(GFP_KERNEL, sizeof(struct NCR_700_sense)); 2048 2049 if (!SDp->hostdata) 2050 return -ENOMEM; 2051 2052 /* to do here: allocate memory; build a queue_full list */ 2053 if(SDp->tagged_supported) { 2054 scsi_set_tag_type(SDp, MSG_ORDERED_TAG); 2055 scsi_activate_tcq(SDp, NCR_700_DEFAULT_TAGS); 2056 NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION); 2057 } else { 2058 /* initialise to default depth */ 2059 scsi_adjust_queue_depth(SDp, 0, SDp->host->cmd_per_lun); 2060 } 2061 if(hostdata->fast) { 2062 /* Find the correct offset and period via domain validation */ 2063 if (!spi_initial_dv(SDp->sdev_target)) 2064 spi_dv_device(SDp); 2065 } else { 2066 spi_offset(SDp->sdev_target) = 0; 2067 spi_period(SDp->sdev_target) = 0; 2068 } 2069 return 0; 2070 } 2071 2072 STATIC void 2073 NCR_700_slave_destroy(struct scsi_device *SDp) 2074 { 2075 kfree(SDp->hostdata); 2076 SDp->hostdata = NULL; 2077 } 2078 2079 static int 2080 NCR_700_change_queue_depth(struct scsi_device *SDp, int depth) 2081 { 2082 if (depth > NCR_700_MAX_TAGS) 2083 depth = NCR_700_MAX_TAGS; 2084 2085 scsi_adjust_queue_depth(SDp, scsi_get_tag_type(SDp), depth); 2086 return depth; 2087 } 2088 2089 static int NCR_700_change_queue_type(struct scsi_device *SDp, int tag_type) 2090 { 2091 int change_tag = ((tag_type ==0 && scsi_get_tag_type(SDp) != 0) 2092 || (tag_type != 0 && scsi_get_tag_type(SDp) == 0)); 2093 struct NCR_700_Host_Parameters *hostdata = 2094 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0]; 2095 2096 scsi_set_tag_type(SDp, tag_type); 2097 2098 /* We have a global (per target) flag to track whether TCQ is 2099 * enabled, so we'll be turning it off for the entire target here. 2100 * our tag algorithm will fail if we mix tagged and untagged commands, 2101 * so quiesce the device before doing this */ 2102 if (change_tag) 2103 scsi_target_quiesce(SDp->sdev_target); 2104 2105 if (!tag_type) { 2106 /* shift back to the default unqueued number of commands 2107 * (the user can still raise this) */ 2108 scsi_deactivate_tcq(SDp, SDp->host->cmd_per_lun); 2109 hostdata->tag_negotiated &= ~(1 << sdev_id(SDp)); 2110 } else { 2111 /* Here, we cleared the negotiation flag above, so this 2112 * will force the driver to renegotiate */ 2113 scsi_activate_tcq(SDp, SDp->queue_depth); 2114 if (change_tag) 2115 NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION); 2116 } 2117 if (change_tag) 2118 scsi_target_resume(SDp->sdev_target); 2119 2120 return tag_type; 2121 } 2122 2123 static ssize_t 2124 NCR_700_show_active_tags(struct device *dev, struct device_attribute *attr, char *buf) 2125 { 2126 struct scsi_device *SDp = to_scsi_device(dev); 2127 2128 return snprintf(buf, 20, "%d\n", NCR_700_get_depth(SDp)); 2129 } 2130 2131 static struct device_attribute NCR_700_active_tags_attr = { 2132 .attr = { 2133 .name = "active_tags", 2134 .mode = S_IRUGO, 2135 }, 2136 .show = NCR_700_show_active_tags, 2137 }; 2138 2139 STATIC struct device_attribute *NCR_700_dev_attrs[] = { 2140 &NCR_700_active_tags_attr, 2141 NULL, 2142 }; 2143 2144 EXPORT_SYMBOL(NCR_700_detect); 2145 EXPORT_SYMBOL(NCR_700_release); 2146 EXPORT_SYMBOL(NCR_700_intr); 2147 2148 static struct spi_function_template NCR_700_transport_functions = { 2149 .set_period = NCR_700_set_period, 2150 .show_period = 1, 2151 .set_offset = NCR_700_set_offset, 2152 .show_offset = 1, 2153 }; 2154 2155 static int __init NCR_700_init(void) 2156 { 2157 NCR_700_transport_template = spi_attach_transport(&NCR_700_transport_functions); 2158 if(!NCR_700_transport_template) 2159 return -ENODEV; 2160 return 0; 2161 } 2162 2163 static void __exit NCR_700_exit(void) 2164 { 2165 spi_release_transport(NCR_700_transport_template); 2166 } 2167 2168 module_init(NCR_700_init); 2169 module_exit(NCR_700_exit); 2170 2171