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1// SPDX-License-Identifier: GPL-2.0-or-later2 3/* NCR (or Symbios) 53c700 and 53c700-66 Driver4 *5 * Copyright (C) 2001 by James.Bottomley@HansenPartnership.com6**-----------------------------------------------------------------------------7** 8**9**-----------------------------------------------------------------------------10 */11 12/* Notes:13 *14 * This driver is designed exclusively for these chips (virtually the15 * earliest of the scripts engine chips). They need their own drivers16 * because they are missing so many of the scripts and snazzy register17 * features of their elder brothers (the 710, 720 and 770).18 *19 * The 700 is the lowliest of the line, it can only do async SCSI.20 * The 700-66 can at least do synchronous SCSI up to 10MHz.21 * 22 * The 700 chip has no host bus interface logic of its own. However,23 * it is usually mapped to a location with well defined register24 * offsets. Therefore, if you can determine the base address and the25 * irq your board incorporating this chip uses, you can probably use26 * this driver to run it (although you'll probably have to write a27 * minimal wrapper for the purpose---see the NCR_D700 driver for28 * details about how to do this).29 *30 *31 * TODO List:32 *33 * 1. Better statistics in the proc fs34 *35 * 2. Implement message queue (queues SCSI messages like commands) and make36 * the abort and device reset functions use them.37 * */38 39/* CHANGELOG40 *41 * Version 2.842 *43 * Fixed bad bug affecting tag starvation processing (previously the44 * driver would hang the system if too many tags starved. Also fixed45 * bad bug having to do with 10 byte command processing and REQUEST46 * SENSE (the command would loop forever getting a transfer length47 * mismatch in the CMD phase).48 *49 * Version 2.750 *51 * Fixed scripts problem which caused certain devices (notably CDRWs)52 * to hang on initial INQUIRY. Updated NCR_700_readl/writel to use53 * __raw_readl/writel for parisc compatibility (Thomas54 * Bogendoerfer). Added missing SCp->request_bufflen initialisation55 * for sense requests (Ryan Bradetich).56 *57 * Version 2.658 *59 * Following test of the 64 bit parisc kernel by Richard Hirst,60 * several problems have now been corrected. Also adds support for61 * consistent memory allocation.62 *63 * Version 2.564 * 65 * More Compatibility changes for 710 (now actually works). Enhanced66 * support for odd clock speeds which constrain SDTR negotiations.67 * correct cacheline separation for scsi messages and status for68 * incoherent architectures. Use of the pci mapping functions on69 * buffers to begin support for 64 bit drivers.70 *71 * Version 2.472 *73 * Added support for the 53c710 chip (in 53c700 emulation mode only---no 74 * special 53c710 instructions or registers are used).75 *76 * Version 2.377 *78 * More endianness/cache coherency changes.79 *80 * Better bad device handling (handles devices lying about tag81 * queueing support and devices which fail to provide sense data on82 * contingent allegiance conditions)83 *84 * Many thanks to Richard Hirst <rhirst@linuxcare.com> for patiently85 * debugging this driver on the parisc architecture and suggesting86 * many improvements and bug fixes.87 *88 * Thanks also go to Linuxcare Inc. for providing several PARISC89 * machines for me to debug the driver on.90 *91 * Version 2.292 *93 * Made the driver mem or io mapped; added endian invariance; added94 * dma cache flushing operations for architectures which need it;95 * added support for more varied clocking speeds.96 *97 * Version 2.198 *99 * Initial modularisation from the D700. See NCR_D700.c for the rest of100 * the changelog.101 * */102#define NCR_700_VERSION "2.8"103 104#include <linux/kernel.h>105#include <linux/types.h>106#include <linux/string.h>107#include <linux/slab.h>108#include <linux/ioport.h>109#include <linux/delay.h>110#include <linux/spinlock.h>111#include <linux/completion.h>112#include <linux/init.h>113#include <linux/proc_fs.h>114#include <linux/blkdev.h>115#include <linux/module.h>116#include <linux/interrupt.h>117#include <linux/device.h>118#include <linux/pgtable.h>119#include <asm/dma.h>120#include <asm/io.h>121#include <asm/byteorder.h>122 123#include <scsi/scsi.h>124#include <scsi/scsi_cmnd.h>125#include <scsi/scsi_dbg.h>126#include <scsi/scsi_eh.h>127#include <scsi/scsi_host.h>128#include <scsi/scsi_tcq.h>129#include <scsi/scsi_transport.h>130#include <scsi/scsi_transport_spi.h>131 132#include "53c700.h"133 134/* NOTE: For 64 bit drivers there are points in the code where we use135 * a non dereferenceable pointer to point to a structure in dma-able136 * memory (which is 32 bits) so that we can use all of the structure137 * operations but take the address at the end. This macro allows us138 * to truncate the 64 bit pointer down to 32 bits without the compiler139 * complaining */140#define to32bit(x) ((__u32)((unsigned long)(x)))141 142#ifdef NCR_700_DEBUG143#define STATIC144#else145#define STATIC static146#endif147 148MODULE_AUTHOR("James Bottomley");149MODULE_DESCRIPTION("53c700 and 53c700-66 Driver");150MODULE_LICENSE("GPL");151 152/* This is the script */153#include "53c700_d.h"154 155 156STATIC int NCR_700_queuecommand(struct Scsi_Host *h, struct scsi_cmnd *);157STATIC int NCR_700_abort(struct scsi_cmnd * SCpnt);158STATIC int NCR_700_host_reset(struct scsi_cmnd * SCpnt);159STATIC void NCR_700_chip_setup(struct Scsi_Host *host);160STATIC void NCR_700_chip_reset(struct Scsi_Host *host);161STATIC int NCR_700_slave_alloc(struct scsi_device *SDpnt);162STATIC int NCR_700_slave_configure(struct scsi_device *SDpnt);163STATIC void NCR_700_slave_destroy(struct scsi_device *SDpnt);164static int NCR_700_change_queue_depth(struct scsi_device *SDpnt, int depth);165 166STATIC const struct attribute_group *NCR_700_dev_groups[];167 168STATIC struct scsi_transport_template *NCR_700_transport_template = NULL;169 170static char *NCR_700_phase[] = {171 "",172 "after selection",173 "before command phase",174 "after command phase",175 "after status phase",176 "after data in phase",177 "after data out phase",178 "during data phase",179};180 181static char *NCR_700_condition[] = {182 "",183 "NOT MSG_OUT",184 "UNEXPECTED PHASE",185 "NOT MSG_IN",186 "UNEXPECTED MSG",187 "MSG_IN",188 "SDTR_MSG RECEIVED",189 "REJECT_MSG RECEIVED",190 "DISCONNECT_MSG RECEIVED",191 "MSG_OUT",192 "DATA_IN",193 194};195 196static char *NCR_700_fatal_messages[] = {197 "unexpected message after reselection",198 "still MSG_OUT after message injection",199 "not MSG_IN after selection",200 "Illegal message length received",201};202 203static char *NCR_700_SBCL_bits[] = {204 "IO ",205 "CD ",206 "MSG ",207 "ATN ",208 "SEL ",209 "BSY ",210 "ACK ",211 "REQ ",212};213 214static char *NCR_700_SBCL_to_phase[] = {215 "DATA_OUT",216 "DATA_IN",217 "CMD_OUT",218 "STATE",219 "ILLEGAL PHASE",220 "ILLEGAL PHASE",221 "MSG OUT",222 "MSG IN",223};224 225/* This translates the SDTR message offset and period to a value226 * which can be loaded into the SXFER_REG.227 *228 * NOTE: According to SCSI-2, the true transfer period (in ns) is229 * actually four times this period value */230static inline __u8231NCR_700_offset_period_to_sxfer(struct NCR_700_Host_Parameters *hostdata,232 __u8 offset, __u8 period)233{234 int XFERP;235 236 __u8 min_xferp = (hostdata->chip710237 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);238 __u8 max_offset = (hostdata->chip710239 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET);240 241 if(offset == 0)242 return 0;243 244 if(period < hostdata->min_period) {245 printk(KERN_WARNING "53c700: Period %dns is less than this chip's minimum, setting to %d\n", period*4, NCR_700_MIN_PERIOD*4);246 period = hostdata->min_period;247 }248 XFERP = (period*4 * hostdata->sync_clock)/1000 - 4;249 if(offset > max_offset) {250 printk(KERN_WARNING "53c700: Offset %d exceeds chip maximum, setting to %d\n",251 offset, max_offset);252 offset = max_offset;253 }254 if(XFERP < min_xferp) {255 XFERP = min_xferp;256 }257 return (offset & 0x0f) | (XFERP & 0x07)<<4;258}259 260static inline __u8261NCR_700_get_SXFER(struct scsi_device *SDp)262{263 struct NCR_700_Host_Parameters *hostdata = 264 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];265 266 return NCR_700_offset_period_to_sxfer(hostdata,267 spi_offset(SDp->sdev_target),268 spi_period(SDp->sdev_target));269}270 271static inline dma_addr_t virt_to_dma(struct NCR_700_Host_Parameters *h, void *p)272{273 return h->pScript + ((uintptr_t)p - (uintptr_t)h->script);274}275 276static inline void dma_sync_to_dev(struct NCR_700_Host_Parameters *h,277 void *addr, size_t size)278{279 if (h->noncoherent)280 dma_sync_single_for_device(h->dev, virt_to_dma(h, addr),281 size, DMA_BIDIRECTIONAL);282}283 284static inline void dma_sync_from_dev(struct NCR_700_Host_Parameters *h,285 void *addr, size_t size)286{287 if (h->noncoherent)288 dma_sync_single_for_device(h->dev, virt_to_dma(h, addr), size,289 DMA_BIDIRECTIONAL);290}291 292struct Scsi_Host *293NCR_700_detect(struct scsi_host_template *tpnt,294 struct NCR_700_Host_Parameters *hostdata, struct device *dev)295{296 dma_addr_t pScript, pSlots;297 __u8 *memory;298 __u32 *script;299 struct Scsi_Host *host;300 static int banner = 0;301 int j;302 303 if (tpnt->sdev_groups == NULL)304 tpnt->sdev_groups = NCR_700_dev_groups;305 306 memory = dma_alloc_coherent(dev, TOTAL_MEM_SIZE, &pScript, GFP_KERNEL);307 if (!memory) {308 hostdata->noncoherent = 1;309 memory = dma_alloc_noncoherent(dev, TOTAL_MEM_SIZE, &pScript,310 DMA_BIDIRECTIONAL, GFP_KERNEL);311 }312 if (!memory) {313 printk(KERN_ERR "53c700: Failed to allocate memory for driver, detaching\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 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_host_reset_handler = NCR_700_host_reset;330 tpnt->can_queue = NCR_700_COMMAND_SLOTS_PER_HOST;331 tpnt->sg_tablesize = NCR_700_SG_SEGMENTS;332 tpnt->cmd_per_lun = NCR_700_CMD_PER_LUN;333 tpnt->slave_configure = NCR_700_slave_configure;334 tpnt->slave_destroy = NCR_700_slave_destroy;335 tpnt->slave_alloc = NCR_700_slave_alloc;336 tpnt->change_queue_depth = NCR_700_change_queue_depth;337 338 if(tpnt->name == NULL)339 tpnt->name = "53c700";340 if(tpnt->proc_name == NULL)341 tpnt->proc_name = "53c700";342 343 host = scsi_host_alloc(tpnt, 4);344 if (!host)345 return NULL;346 memset(hostdata->slots, 0, sizeof(struct NCR_700_command_slot)347 * NCR_700_COMMAND_SLOTS_PER_HOST);348 for (j = 0; j < NCR_700_COMMAND_SLOTS_PER_HOST; j++) {349 dma_addr_t offset = (dma_addr_t)((unsigned long)&hostdata->slots[j].SG[0]350 - (unsigned long)&hostdata->slots[0].SG[0]);351 hostdata->slots[j].pSG = (struct NCR_700_SG_List *)((unsigned long)(pSlots + offset));352 if(j == 0)353 hostdata->free_list = &hostdata->slots[j];354 else355 hostdata->slots[j-1].ITL_forw = &hostdata->slots[j];356 hostdata->slots[j].state = NCR_700_SLOT_FREE;357 }358 359 for (j = 0; j < ARRAY_SIZE(SCRIPT); j++)360 script[j] = bS_to_host(SCRIPT[j]);361 362 /* adjust all labels to be bus physical */363 for (j = 0; j < PATCHES; j++)364 script[LABELPATCHES[j]] = bS_to_host(pScript + SCRIPT[LABELPATCHES[j]]);365 /* now patch up fixed addresses. */366 script_patch_32(hostdata, script, MessageLocation,367 pScript + MSGOUT_OFFSET);368 script_patch_32(hostdata, script, StatusAddress,369 pScript + STATUS_OFFSET);370 script_patch_32(hostdata, script, ReceiveMsgAddress,371 pScript + MSGIN_OFFSET);372 373 hostdata->script = script;374 hostdata->pScript = pScript;375 dma_sync_single_for_device(hostdata->dev, pScript, sizeof(SCRIPT), DMA_TO_DEVICE);376 hostdata->state = NCR_700_HOST_FREE;377 hostdata->cmd = NULL;378 host->max_id = 8;379 host->max_lun = NCR_700_MAX_LUNS;380 BUG_ON(NCR_700_transport_template == NULL);381 host->transportt = NCR_700_transport_template;382 host->unique_id = (unsigned long)hostdata->base;383 hostdata->eh_complete = NULL;384 host->hostdata[0] = (unsigned long)hostdata;385 /* kick the chip */386 NCR_700_writeb(0xff, host, CTEST9_REG);387 if (hostdata->chip710)388 hostdata->rev = (NCR_700_readb(host, CTEST8_REG)>>4) & 0x0f;389 else390 hostdata->rev = (NCR_700_readb(host, CTEST7_REG)>>4) & 0x0f;391 hostdata->fast = (NCR_700_readb(host, CTEST9_REG) == 0);392 if (banner == 0) {393 printk(KERN_NOTICE "53c700: Version " NCR_700_VERSION " By James.Bottomley@HansenPartnership.com\n");394 banner = 1;395 }396 printk(KERN_NOTICE "scsi%d: %s rev %d %s\n", host->host_no,397 hostdata->chip710 ? "53c710" :398 (hostdata->fast ? "53c700-66" : "53c700"),399 hostdata->rev, hostdata->differential ?400 "(Differential)" : "");401 /* reset the chip */402 NCR_700_chip_reset(host);403 404 if (scsi_add_host(host, dev)) {405 dev_printk(KERN_ERR, dev, "53c700: scsi_add_host failed\n");406 scsi_host_put(host);407 return NULL;408 }409 410 spi_signalling(host) = hostdata->differential ? SPI_SIGNAL_HVD :411 SPI_SIGNAL_SE;412 413 return host;414}415 416int417NCR_700_release(struct Scsi_Host *host)418{419 struct NCR_700_Host_Parameters *hostdata = 420 (struct NCR_700_Host_Parameters *)host->hostdata[0];421 422 if (hostdata->noncoherent)423 dma_free_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,424 hostdata->script, hostdata->pScript,425 DMA_BIDIRECTIONAL);426 else427 dma_free_coherent(hostdata->dev, TOTAL_MEM_SIZE,428 hostdata->script, hostdata->pScript);429 return 1;430}431 432static inline __u8433NCR_700_identify(int can_disconnect, __u8 lun)434{435 return IDENTIFY_BASE |436 ((can_disconnect) ? 0x40 : 0) |437 (lun & NCR_700_LUN_MASK);438}439 440/*441 * Function : static int data_residual (Scsi_Host *host)442 *443 * Purpose : return residual data count of what's in the chip. If you444 * really want to know what this function is doing, it's almost a445 * direct transcription of the algorithm described in the 53c710446 * guide, except that the DBC and DFIFO registers are only 6 bits447 * wide on a 53c700.448 *449 * Inputs : host - SCSI host */450static inline int451NCR_700_data_residual (struct Scsi_Host *host) {452 struct NCR_700_Host_Parameters *hostdata = 453 (struct NCR_700_Host_Parameters *)host->hostdata[0];454 int count, synchronous = 0;455 unsigned int ddir;456 457 if(hostdata->chip710) {458 count = ((NCR_700_readb(host, DFIFO_REG) & 0x7f) -459 (NCR_700_readl(host, DBC_REG) & 0x7f)) & 0x7f;460 } else {461 count = ((NCR_700_readb(host, DFIFO_REG) & 0x3f) -462 (NCR_700_readl(host, DBC_REG) & 0x3f)) & 0x3f;463 }464 465 if(hostdata->fast)466 synchronous = NCR_700_readb(host, SXFER_REG) & 0x0f;467 468 /* get the data direction */469 ddir = NCR_700_readb(host, CTEST0_REG) & 0x01;470 471 if (ddir) {472 /* Receive */473 if (synchronous) 474 count += (NCR_700_readb(host, SSTAT2_REG) & 0xf0) >> 4;475 else476 if (NCR_700_readb(host, SSTAT1_REG) & SIDL_REG_FULL)477 ++count;478 } else {479 /* Send */480 __u8 sstat = NCR_700_readb(host, SSTAT1_REG);481 if (sstat & SODL_REG_FULL)482 ++count;483 if (synchronous && (sstat & SODR_REG_FULL))484 ++count;485 }486#ifdef NCR_700_DEBUG487 if(count)488 printk("RESIDUAL IS %d (ddir %d)\n", count, ddir);489#endif490 return count;491}492 493/* print out the SCSI wires and corresponding phase from the SBCL register494 * in the chip */495static inline char *496sbcl_to_string(__u8 sbcl)497{498 int i;499 static char ret[256];500 501 ret[0]='\0';502 for(i=0; i<8; i++) {503 if((1<<i) & sbcl) 504 strcat(ret, NCR_700_SBCL_bits[i]);505 }506 strcat(ret, NCR_700_SBCL_to_phase[sbcl & 0x07]);507 return ret;508}509 510static inline __u8511bitmap_to_number(__u8 bitmap)512{513 __u8 i;514 515 for(i=0; i<8 && !(bitmap &(1<<i)); i++)516 ;517 return i;518}519 520/* Pull a slot off the free list */521STATIC struct NCR_700_command_slot *522find_empty_slot(struct NCR_700_Host_Parameters *hostdata)523{524 struct NCR_700_command_slot *slot = hostdata->free_list;525 526 if(slot == NULL) {527 /* sanity check */528 if(hostdata->command_slot_count != NCR_700_COMMAND_SLOTS_PER_HOST)529 printk(KERN_ERR "SLOTS FULL, but count is %d, should be %d\n", hostdata->command_slot_count, NCR_700_COMMAND_SLOTS_PER_HOST);530 return NULL;531 }532 533 if(slot->state != NCR_700_SLOT_FREE)534 /* should panic! */535 printk(KERN_ERR "BUSY SLOT ON FREE LIST!!!\n");536 537 538 hostdata->free_list = slot->ITL_forw;539 slot->ITL_forw = NULL;540 541 542 /* NOTE: set the state to busy here, not queued, since this543 * indicates the slot is in use and cannot be run by the IRQ544 * finish routine. If we cannot queue the command when it545 * is properly build, we then change to NCR_700_SLOT_QUEUED */546 slot->state = NCR_700_SLOT_BUSY;547 slot->flags = 0;548 hostdata->command_slot_count++;549 550 return slot;551}552 553STATIC void 554free_slot(struct NCR_700_command_slot *slot,555 struct NCR_700_Host_Parameters *hostdata)556{557 if((slot->state & NCR_700_SLOT_MASK) != NCR_700_SLOT_MAGIC) {558 printk(KERN_ERR "53c700: SLOT %p is not MAGIC!!!\n", slot);559 }560 if(slot->state == NCR_700_SLOT_FREE) {561 printk(KERN_ERR "53c700: SLOT %p is FREE!!!\n", slot);562 }563 564 slot->resume_offset = 0;565 slot->cmnd = NULL;566 slot->state = NCR_700_SLOT_FREE;567 slot->ITL_forw = hostdata->free_list;568 hostdata->free_list = slot;569 hostdata->command_slot_count--;570}571 572 573/* This routine really does very little. The command is indexed on574 the ITL and (if tagged) the ITLQ lists in _queuecommand */575STATIC void576save_for_reselection(struct NCR_700_Host_Parameters *hostdata,577 struct scsi_cmnd *SCp, __u32 dsp)578{579 /* Its just possible that this gets executed twice */580 if(SCp != NULL) {581 struct NCR_700_command_slot *slot =582 (struct NCR_700_command_slot *)SCp->host_scribble;583 584 slot->resume_offset = dsp;585 }586 hostdata->state = NCR_700_HOST_FREE;587 hostdata->cmd = NULL;588}589 590STATIC inline void591NCR_700_unmap(struct NCR_700_Host_Parameters *hostdata, struct scsi_cmnd *SCp,592 struct NCR_700_command_slot *slot)593{594 if(SCp->sc_data_direction != DMA_NONE &&595 SCp->sc_data_direction != DMA_BIDIRECTIONAL)596 scsi_dma_unmap(SCp);597}598 599STATIC inline void600NCR_700_scsi_done(struct NCR_700_Host_Parameters *hostdata,601 struct scsi_cmnd *SCp, int result)602{603 hostdata->state = NCR_700_HOST_FREE;604 hostdata->cmd = NULL;605 606 if(SCp != NULL) {607 struct NCR_700_command_slot *slot =608 (struct NCR_700_command_slot *)SCp->host_scribble;609 610 dma_unmap_single(hostdata->dev, slot->pCmd,611 MAX_COMMAND_SIZE, DMA_TO_DEVICE);612 if (slot->flags == NCR_700_FLAG_AUTOSENSE) {613 char *cmnd = NCR_700_get_sense_cmnd(SCp->device);614 615 dma_unmap_single(hostdata->dev, slot->dma_handle,616 SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);617 /* restore the old result if the request sense was618 * successful */619 if (result == 0)620 result = cmnd[7];621 /* restore the original length */622 SCp->cmd_len = cmnd[8];623 } else624 NCR_700_unmap(hostdata, SCp, slot);625 626 free_slot(slot, hostdata);627#ifdef NCR_700_DEBUG628 if(NCR_700_get_depth(SCp->device) == 0 ||629 NCR_700_get_depth(SCp->device) > SCp->device->queue_depth)630 printk(KERN_ERR "Invalid depth in NCR_700_scsi_done(): %d\n",631 NCR_700_get_depth(SCp->device));632#endif /* NCR_700_DEBUG */633 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) - 1);634 635 SCp->host_scribble = NULL;636 SCp->result = result;637 scsi_done(SCp);638 } else {639 printk(KERN_ERR "53c700: SCSI DONE HAS NULL SCp\n");640 }641}642 643 644STATIC void645NCR_700_internal_bus_reset(struct Scsi_Host *host)646{647 /* Bus reset */648 NCR_700_writeb(ASSERT_RST, host, SCNTL1_REG);649 udelay(50);650 NCR_700_writeb(0, host, SCNTL1_REG);651 652}653 654STATIC void655NCR_700_chip_setup(struct Scsi_Host *host)656{657 struct NCR_700_Host_Parameters *hostdata = 658 (struct NCR_700_Host_Parameters *)host->hostdata[0];659 __u8 min_period;660 __u8 min_xferp = (hostdata->chip710 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);661 662 if(hostdata->chip710) {663 __u8 burst_disable = 0;664 __u8 burst_length = 0;665 666 switch (hostdata->burst_length) {667 case 1:668 burst_length = BURST_LENGTH_1;669 break;670 case 2:671 burst_length = BURST_LENGTH_2;672 break;673 case 4:674 burst_length = BURST_LENGTH_4;675 break;676 case 8:677 burst_length = BURST_LENGTH_8;678 break;679 default:680 burst_disable = BURST_DISABLE;681 break;682 }683 hostdata->dcntl_extra |= COMPAT_700_MODE;684 685 NCR_700_writeb(hostdata->dcntl_extra, host, DCNTL_REG);686 NCR_700_writeb(burst_length | hostdata->dmode_extra,687 host, DMODE_710_REG);688 NCR_700_writeb(burst_disable | hostdata->ctest7_extra |689 (hostdata->differential ? DIFF : 0),690 host, CTEST7_REG);691 NCR_700_writeb(BTB_TIMER_DISABLE, host, CTEST0_REG);692 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY | PARITY693 | AUTO_ATN, host, SCNTL0_REG);694 } else {695 NCR_700_writeb(BURST_LENGTH_8 | hostdata->dmode_extra,696 host, DMODE_700_REG);697 NCR_700_writeb(hostdata->differential ? 698 DIFF : 0, host, CTEST7_REG);699 if(hostdata->fast) {700 /* this is for 700-66, does nothing on 700 */701 NCR_700_writeb(LAST_DIS_ENBL | ENABLE_ACTIVE_NEGATION 702 | GENERATE_RECEIVE_PARITY, host,703 CTEST8_REG);704 } else {705 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY706 | PARITY | AUTO_ATN, host, SCNTL0_REG);707 }708 }709 710 NCR_700_writeb(1 << host->this_id, host, SCID_REG);711 NCR_700_writeb(0, host, SBCL_REG);712 NCR_700_writeb(ASYNC_OPERATION, host, SXFER_REG);713 714 NCR_700_writeb(PHASE_MM_INT | SEL_TIMEOUT_INT | GROSS_ERR_INT | UX_DISC_INT715 | RST_INT | PAR_ERR_INT | SELECT_INT, host, SIEN_REG);716 717 NCR_700_writeb(ABORT_INT | INT_INST_INT | ILGL_INST_INT, host, DIEN_REG);718 NCR_700_writeb(ENABLE_SELECT, host, SCNTL1_REG);719 if(hostdata->clock > 75) {720 printk(KERN_ERR "53c700: Clock speed %dMHz is too high: 75Mhz is the maximum this chip can be driven at\n", hostdata->clock);721 /* do the best we can, but the async clock will be out722 * of spec: sync divider 2, async divider 3 */723 DEBUG(("53c700: sync 2 async 3\n"));724 NCR_700_writeb(SYNC_DIV_2_0, host, SBCL_REG);725 NCR_700_writeb(ASYNC_DIV_3_0 | hostdata->dcntl_extra, host, DCNTL_REG);726 hostdata->sync_clock = hostdata->clock/2;727 } else if(hostdata->clock > 50 && hostdata->clock <= 75) {728 /* sync divider 1.5, async divider 3 */729 DEBUG(("53c700: sync 1.5 async 3\n"));730 NCR_700_writeb(SYNC_DIV_1_5, host, SBCL_REG);731 NCR_700_writeb(ASYNC_DIV_3_0 | hostdata->dcntl_extra, host, DCNTL_REG);732 hostdata->sync_clock = hostdata->clock*2;733 hostdata->sync_clock /= 3;734 735 } else if(hostdata->clock > 37 && hostdata->clock <= 50) {736 /* sync divider 1, async divider 2 */737 DEBUG(("53c700: sync 1 async 2\n"));738 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);739 NCR_700_writeb(ASYNC_DIV_2_0 | hostdata->dcntl_extra, host, DCNTL_REG);740 hostdata->sync_clock = hostdata->clock;741 } else if(hostdata->clock > 25 && hostdata->clock <=37) {742 /* sync divider 1, async divider 1.5 */743 DEBUG(("53c700: sync 1 async 1.5\n"));744 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);745 NCR_700_writeb(ASYNC_DIV_1_5 | hostdata->dcntl_extra, host, DCNTL_REG);746 hostdata->sync_clock = hostdata->clock;747 } else {748 DEBUG(("53c700: sync 1 async 1\n"));749 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);750 NCR_700_writeb(ASYNC_DIV_1_0 | hostdata->dcntl_extra, host, DCNTL_REG);751 /* sync divider 1, async divider 1 */752 hostdata->sync_clock = hostdata->clock;753 }754 /* Calculate the actual minimum period that can be supported755 * by our synchronous clock speed. See the 710 manual for756 * exact details of this calculation which is based on a757 * setting of the SXFER register */758 min_period = 1000*(4+min_xferp)/(4*hostdata->sync_clock);759 hostdata->min_period = NCR_700_MIN_PERIOD;760 if(min_period > NCR_700_MIN_PERIOD)761 hostdata->min_period = min_period;762}763 764STATIC void765NCR_700_chip_reset(struct Scsi_Host *host)766{767 struct NCR_700_Host_Parameters *hostdata = 768 (struct NCR_700_Host_Parameters *)host->hostdata[0];769 if(hostdata->chip710) {770 NCR_700_writeb(SOFTWARE_RESET_710, host, ISTAT_REG);771 udelay(100);772 773 NCR_700_writeb(0, host, ISTAT_REG);774 } else {775 NCR_700_writeb(SOFTWARE_RESET, host, DCNTL_REG);776 udelay(100);777 778 NCR_700_writeb(0, host, DCNTL_REG);779 }780 781 mdelay(1000);782 783 NCR_700_chip_setup(host);784}785 786/* The heart of the message processing engine is that the instruction787 * immediately after the INT is the normal case (and so must be CLEAR788 * ACK). If we want to do something else, we call that routine in789 * scripts and set temp to be the normal case + 8 (skipping the CLEAR790 * ACK) so that the routine returns correctly to resume its activity791 * */792STATIC __u32793process_extended_message(struct Scsi_Host *host, 794 struct NCR_700_Host_Parameters *hostdata,795 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)796{797 __u32 resume_offset = dsp, temp = dsp + 8;798 __u8 pun = 0xff, lun = 0xff;799 800 if(SCp != NULL) {801 pun = SCp->device->id;802 lun = SCp->device->lun;803 }804 805 switch(hostdata->msgin[2]) {806 case A_SDTR_MSG:807 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {808 struct scsi_target *starget = SCp->device->sdev_target;809 __u8 period = hostdata->msgin[3];810 __u8 offset = hostdata->msgin[4];811 812 if(offset == 0 || period == 0) {813 offset = 0;814 period = 0;815 }816 817 spi_offset(starget) = offset;818 spi_period(starget) = period;819 820 if(NCR_700_is_flag_set(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION)) {821 spi_display_xfer_agreement(starget);822 NCR_700_clear_flag(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION);823 }824 825 NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);826 NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);827 828 NCR_700_writeb(NCR_700_get_SXFER(SCp->device),829 host, SXFER_REG);830 831 } else {832 /* SDTR message out of the blue, reject it */833 shost_printk(KERN_WARNING, host,834 "Unexpected SDTR msg\n");835 hostdata->msgout[0] = A_REJECT_MSG;836 dma_sync_to_dev(hostdata, hostdata->msgout, 1);837 script_patch_16(hostdata, hostdata->script,838 MessageCount, 1);839 /* SendMsgOut returns, so set up the return840 * 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_sync_to_dev(hostdata, hostdata->msgout, 1);850 script_patch_16(hostdata, 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 spi_print_msg(hostdata->msgin);860 printk("\n");861 /* just reject it */862 hostdata->msgout[0] = A_REJECT_MSG;863 dma_sync_to_dev(hostdata, hostdata->msgout, 1);864 script_patch_16(hostdata, hostdata->script, MessageCount, 1);865 /* SendMsgOut returns, so set up the return866 * address */867 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;868 }869 NCR_700_writel(temp, host, TEMP_REG);870 return resume_offset;871}872 873STATIC __u32874process_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_DEBUG887 printk("scsi%d (%d:%d): message %s: ", host->host_no, pun, lun,888 NCR_700_phase[(dsps & 0xf00) >> 8]);889 spi_print_msg(hostdata->msgin);890 printk("\n");891#endif892 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 scmd_printk(KERN_WARNING, SCp,910 "Rejected first tag queue attempt, turning off tag queueing\n");911 /* we're done negotiating */912 NCR_700_set_tag_neg_state(SCp->device, NCR_700_FINISHED_TAG_NEGOTIATION);913 hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));914 915 SCp->device->tagged_supported = 0;916 SCp->device->simple_tags = 0;917 scsi_change_queue_depth(SCp->device, host->cmd_per_lun);918 } else {919 shost_printk(KERN_WARNING, host,920 "(%d:%d) Unexpected REJECT Message %s\n",921 pun, lun,922 NCR_700_phase[(dsps & 0xf00) >> 8]);923 /* however, just ignore it */924 }925 break;926 927 case A_PARITY_ERROR_MSG:928 printk(KERN_ERR "scsi%d (%d:%d) Parity Error!\n", host->host_no,929 pun, lun);930 NCR_700_internal_bus_reset(host);931 break;932 case A_SIMPLE_TAG_MSG:933 printk(KERN_INFO "scsi%d (%d:%d) SIMPLE TAG %d %s\n", host->host_no,934 pun, lun, hostdata->msgin[1],935 NCR_700_phase[(dsps & 0xf00) >> 8]);936 /* just ignore it */937 break;938 default:939 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",940 host->host_no, pun, lun,941 NCR_700_phase[(dsps & 0xf00) >> 8]);942 943 spi_print_msg(hostdata->msgin);944 printk("\n");945 /* just reject it */946 hostdata->msgout[0] = A_REJECT_MSG;947 dma_sync_to_dev(hostdata, hostdata->msgout, 1);948 script_patch_16(hostdata, hostdata->script, MessageCount, 1);949 /* SendMsgOut returns, so set up the return950 * address */951 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;952 953 break;954 }955 NCR_700_writel(temp, host, TEMP_REG);956 /* set us up to receive another message */957 dma_sync_from_dev(hostdata, hostdata->msgin, MSG_ARRAY_SIZE);958 return resume_offset;959}960 961STATIC __u32962process_script_interrupt(__u32 dsps, __u32 dsp, struct scsi_cmnd *SCp,963 struct Scsi_Host *host,964 struct NCR_700_Host_Parameters *hostdata)965{966 __u32 resume_offset = 0;967 __u8 pun = 0xff, lun=0xff;968 969 if(SCp != NULL) {970 pun = SCp->device->id;971 lun = SCp->device->lun;972 }973 974 if(dsps == A_GOOD_STATUS_AFTER_STATUS) {975 DEBUG((" COMMAND COMPLETE, status=%02x\n",976 hostdata->status[0]));977 /* OK, if TCQ still under negotiation, we now know it works */978 if (NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION)979 NCR_700_set_tag_neg_state(SCp->device,980 NCR_700_FINISHED_TAG_NEGOTIATION);981 982 /* check for contingent allegiance conditions */983 if (hostdata->status[0] == SAM_STAT_CHECK_CONDITION ||984 hostdata->status[0] == SAM_STAT_COMMAND_TERMINATED) {985 struct NCR_700_command_slot *slot =986 (struct NCR_700_command_slot *)SCp->host_scribble;987 if(slot->flags == NCR_700_FLAG_AUTOSENSE) {988 /* OOPS: bad device, returning another989 * contingent allegiance condition */990 scmd_printk(KERN_ERR, SCp,991 "broken device is looping in contingent allegiance: ignoring\n");992 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);993 } else {994 char *cmnd =995 NCR_700_get_sense_cmnd(SCp->device);996#ifdef NCR_DEBUG997 scsi_print_command(SCp);998 printk(" cmd %p has status %d, requesting sense\n",999 SCp, hostdata->status[0]);1000#endif1001 /* we can destroy the command here1002 * because the contingent allegiance1003 * condition will cause a retry which1004 * will re-copy the command from the1005 * saved data_cmnd. We also unmap any1006 * data associated with the command1007 * here */1008 NCR_700_unmap(hostdata, SCp, slot);1009 dma_unmap_single(hostdata->dev, slot->pCmd,1010 MAX_COMMAND_SIZE,1011 DMA_TO_DEVICE);1012 1013 cmnd[0] = REQUEST_SENSE;1014 cmnd[1] = (lun & 0x7) << 5;1015 cmnd[2] = 0;1016 cmnd[3] = 0;1017 cmnd[4] = SCSI_SENSE_BUFFERSIZE;1018 cmnd[5] = 0;1019 /* Here's a quiet hack: the1020 * REQUEST_SENSE command is six bytes,1021 * so store a flag indicating that1022 * this was an internal sense request1023 * and the original status at the end1024 * of the command */1025 cmnd[6] = NCR_700_INTERNAL_SENSE_MAGIC;1026 cmnd[7] = hostdata->status[0];1027 cmnd[8] = SCp->cmd_len;1028 SCp->cmd_len = 6; /* command length for1029 * REQUEST_SENSE */1030 slot->pCmd = dma_map_single(hostdata->dev, cmnd, MAX_COMMAND_SIZE, DMA_TO_DEVICE);1031 slot->dma_handle = dma_map_single(hostdata->dev, SCp->sense_buffer, SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);1032 slot->SG[0].ins = bS_to_host(SCRIPT_MOVE_DATA_IN | SCSI_SENSE_BUFFERSIZE);1033 slot->SG[0].pAddr = bS_to_host(slot->dma_handle);1034 slot->SG[1].ins = bS_to_host(SCRIPT_RETURN);1035 slot->SG[1].pAddr = 0;1036 slot->resume_offset = hostdata->pScript;1037 dma_sync_to_dev(hostdata, slot->SG, sizeof(slot->SG[0])*2);1038 dma_sync_from_dev(hostdata, SCp->sense_buffer, SCSI_SENSE_BUFFERSIZE);1039 1040 /* queue the command for reissue */1041 slot->state = NCR_700_SLOT_QUEUED;1042 slot->flags = NCR_700_FLAG_AUTOSENSE;1043 hostdata->state = NCR_700_HOST_FREE;1044 hostdata->cmd = NULL;1045 }1046 } else {1047 // Currently rely on the mid layer evaluation1048 // of the tag queuing capability1049 //1050 //if(status_byte(hostdata->status[0]) == GOOD &&1051 // SCp->cmnd[0] == INQUIRY && SCp->use_sg == 0) {1052 // /* Piggy back the tag queueing support1053 // * on this command */1054 // dma_sync_single_for_cpu(hostdata->dev,1055 // slot->dma_handle,1056 // SCp->request_bufflen,1057 // DMA_FROM_DEVICE);1058 // if(((char *)SCp->request_buffer)[7] & 0x02) {1059 // scmd_printk(KERN_INFO, SCp,1060 // "Enabling Tag Command Queuing\n");1061 // hostdata->tag_negotiated |= (1<<scmd_id(SCp));1062 // NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);1063 // } else {1064 // NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);1065 // hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));1066 // }1067 //}1068 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);1069 }1070 } else if((dsps & 0xfffff0f0) == A_UNEXPECTED_PHASE) {1071 __u8 i = (dsps & 0xf00) >> 8;1072 1073 scmd_printk(KERN_ERR, SCp, "UNEXPECTED PHASE %s (%s)\n",1074 NCR_700_phase[i],1075 sbcl_to_string(NCR_700_readb(host, SBCL_REG)));1076 scmd_printk(KERN_ERR, SCp, " len = %d, cmd =",1077 SCp->cmd_len);1078 scsi_print_command(SCp);1079 1080 NCR_700_internal_bus_reset(host);1081 } else if((dsps & 0xfffff000) == A_FATAL) {1082 int i = (dsps & 0xfff);1083 1084 printk(KERN_ERR "scsi%d: (%d:%d) FATAL ERROR: %s\n",1085 host->host_no, pun, lun, NCR_700_fatal_messages[i]);1086 if(dsps == A_FATAL_ILLEGAL_MSG_LENGTH) {1087 printk(KERN_ERR " msg begins %02x %02x\n",1088 hostdata->msgin[0], hostdata->msgin[1]);1089 }1090 NCR_700_internal_bus_reset(host);1091 } else if((dsps & 0xfffff0f0) == A_DISCONNECT) {1092#ifdef NCR_700_DEBUG1093 __u8 i = (dsps & 0xf00) >> 8;1094 1095 printk("scsi%d: (%d:%d), DISCONNECTED (%d) %s\n",1096 host->host_no, pun, lun,1097 i, NCR_700_phase[i]);1098#endif1099 save_for_reselection(hostdata, SCp, dsp);1100 1101 } else if(dsps == A_RESELECTION_IDENTIFIED) {1102 __u8 lun;1103 struct NCR_700_command_slot *slot;1104 __u8 reselection_id = hostdata->reselection_id;1105 struct scsi_device *SDp;1106 1107 lun = hostdata->msgin[0] & 0x1f;1108 1109 hostdata->reselection_id = 0xff;1110 DEBUG(("scsi%d: (%d:%d) RESELECTED!\n",1111 host->host_no, reselection_id, lun));1112 /* clear the reselection indicator */1113 SDp = __scsi_device_lookup(host, 0, reselection_id, lun);1114 if(unlikely(SDp == NULL)) {1115 printk(KERN_ERR "scsi%d: (%d:%d) HAS NO device\n",1116 host->host_no, reselection_id, lun);1117 BUG();1118 }1119 if(hostdata->msgin[1] == A_SIMPLE_TAG_MSG) {1120 struct scsi_cmnd *SCp;1121 1122 SCp = scsi_host_find_tag(SDp->host, hostdata->msgin[2]);1123 if(unlikely(SCp == NULL)) {1124 printk(KERN_ERR "scsi%d: (%d:%d) no saved request for tag %d\n", 1125 host->host_no, reselection_id, lun, hostdata->msgin[2]);1126 BUG();1127 }1128 1129 slot = (struct NCR_700_command_slot *)SCp->host_scribble;1130 DDEBUG(KERN_DEBUG, SDp,1131 "reselection is tag %d, slot %p(%d)\n",1132 hostdata->msgin[2], slot, slot->tag);1133 } else {1134 struct NCR_700_Device_Parameters *p = SDp->hostdata;1135 struct scsi_cmnd *SCp = p->current_cmnd;1136 1137 if(unlikely(SCp == NULL)) {1138 sdev_printk(KERN_ERR, SDp,1139 "no saved request for untagged cmd\n");1140 BUG();1141 }1142 slot = (struct NCR_700_command_slot *)SCp->host_scribble;1143 }1144 1145 if(slot == NULL) {1146 printk(KERN_ERR "scsi%d: (%d:%d) RESELECTED but no saved command (MSG = %02x %02x %02x)!!\n",1147 host->host_no, reselection_id, lun,1148 hostdata->msgin[0], hostdata->msgin[1],1149 hostdata->msgin[2]);1150 } else {1151 if(hostdata->state != NCR_700_HOST_BUSY)1152 printk(KERN_ERR "scsi%d: FATAL, host not busy during valid reselection!\n",1153 host->host_no);1154 resume_offset = slot->resume_offset;1155 hostdata->cmd = slot->cmnd;1156 1157 /* re-patch for this command */1158 script_patch_32_abs(hostdata, hostdata->script,1159 CommandAddress, slot->pCmd);1160 script_patch_16(hostdata, hostdata->script,1161 CommandCount, slot->cmnd->cmd_len);1162 script_patch_32_abs(hostdata, hostdata->script,1163 SGScriptStartAddress,1164 to32bit(&slot->pSG[0].ins));1165 1166 /* Note: setting SXFER only works if we're1167 * still in the MESSAGE phase, so it is vital1168 * that ACK is still asserted when we process1169 * the reselection message. The resume offset1170 * should therefore always clear ACK */1171 NCR_700_writeb(NCR_700_get_SXFER(hostdata->cmd->device),1172 host, SXFER_REG);1173 dma_sync_from_dev(hostdata, hostdata->msgin,1174 MSG_ARRAY_SIZE);1175 dma_sync_to_dev(hostdata, hostdata->msgout,1176 MSG_ARRAY_SIZE);1177 /* I'm just being paranoid here, the command should1178 * already have been flushed from the cache */1179 dma_sync_to_dev(hostdata, slot->cmnd->cmnd,1180 slot->cmnd->cmd_len);1181 1182 1183 1184 }1185 } else if(dsps == A_RESELECTED_DURING_SELECTION) {1186 1187 /* This section is full of debugging code because I've1188 * never managed to reach it. I think what happens is1189 * that, because the 700 runs with selection1190 * interrupts enabled the whole time that we take a1191 * selection interrupt before we manage to get to the1192 * reselected script interrupt */1193 1194 __u8 reselection_id = NCR_700_readb(host, SFBR_REG);1195 struct NCR_700_command_slot *slot;1196 1197 /* Take out our own ID */1198 reselection_id &= ~(1<<host->this_id);1199 1200 /* I've never seen this happen, so keep this as a printk rather1201 * than a debug */1202 printk(KERN_INFO "scsi%d: (%d:%d) RESELECTION DURING SELECTION, dsp=%08x[%04x] state=%d, count=%d\n",1203 host->host_no, reselection_id, lun, dsp, dsp - hostdata->pScript, hostdata->state, hostdata->command_slot_count);1204 1205 {1206 /* FIXME: DEBUGGING CODE */1207 __u32 SG = (__u32)bS_to_cpu(hostdata->script[A_SGScriptStartAddress_used[0]]);1208 int i;1209 1210 for(i=0; i< NCR_700_COMMAND_SLOTS_PER_HOST; i++) {1211 if(SG >= to32bit(&hostdata->slots[i].pSG[0])1212 && SG <= to32bit(&hostdata->slots[i].pSG[NCR_700_SG_SEGMENTS]))1213 break;1214 }1215 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);1216 SCp = hostdata->slots[i].cmnd;1217 }1218 1219 if(SCp != NULL) {1220 slot = (struct NCR_700_command_slot *)SCp->host_scribble;1221 /* change slot from busy to queued to redo command */1222 slot->state = NCR_700_SLOT_QUEUED;1223 }1224 hostdata->cmd = NULL;1225 1226 if(reselection_id == 0) {1227 if(hostdata->reselection_id == 0xff) {1228 printk(KERN_ERR "scsi%d: Invalid reselection during selection!!\n", host->host_no);1229 return 0;1230 } else {1231 printk(KERN_ERR "scsi%d: script reselected and we took a selection interrupt\n",1232 host->host_no);1233 reselection_id = hostdata->reselection_id;1234 }1235 } else {1236 1237 /* convert to real ID */1238 reselection_id = bitmap_to_number(reselection_id);1239 }1240 hostdata->reselection_id = reselection_id;1241 /* just in case we have a stale simple tag message, clear it */1242 hostdata->msgin[1] = 0;1243 dma_sync_to_dev(hostdata, hostdata->msgin, MSG_ARRAY_SIZE);1244 if(hostdata->tag_negotiated & (1<<reselection_id)) {1245 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;1246 } else {1247 resume_offset = hostdata->pScript + Ent_GetReselectionData;1248 }1249 } else if(dsps == A_COMPLETED_SELECTION_AS_TARGET) {1250 /* we've just disconnected from the bus, do nothing since1251 * a return here will re-run the queued command slot1252 * that may have been interrupted by the initial selection */1253 DEBUG((" SELECTION COMPLETED\n"));1254 } else if((dsps & 0xfffff0f0) == A_MSG_IN) { 1255 resume_offset = process_message(host, hostdata, SCp,1256 dsp, dsps);1257 } else if((dsps & 0xfffff000) == 0) {1258 __u8 i = (dsps & 0xf0) >> 4, j = (dsps & 0xf00) >> 8;1259 printk(KERN_ERR "scsi%d: (%d:%d), unhandled script condition %s %s at %04x\n",1260 host->host_no, pun, lun, NCR_700_condition[i],1261 NCR_700_phase[j], dsp - hostdata->pScript);1262 if(SCp != NULL) {1263 struct scatterlist *sg;1264 1265 scsi_print_command(SCp);1266 scsi_for_each_sg(SCp, sg, scsi_sg_count(SCp) + 1, i) {1267 printk(KERN_INFO " SG[%d].length = %d, move_insn=%08x, addr %08x\n", i, sg->length, ((struct NCR_700_command_slot *)SCp->host_scribble)->SG[i].ins, ((struct NCR_700_command_slot *)SCp->host_scribble)->SG[i].pAddr);1268 }1269 }1270 NCR_700_internal_bus_reset(host);1271 } else if((dsps & 0xfffff000) == A_DEBUG_INTERRUPT) {1272 printk(KERN_NOTICE "scsi%d (%d:%d) DEBUG INTERRUPT %d AT %08x[%04x], continuing\n",1273 host->host_no, pun, lun, dsps & 0xfff, dsp, dsp - hostdata->pScript);1274 resume_offset = dsp;1275 } else {1276 printk(KERN_ERR "scsi%d: (%d:%d), unidentified script interrupt 0x%x at %04x\n",1277 host->host_no, pun, lun, dsps, dsp - hostdata->pScript);1278 NCR_700_internal_bus_reset(host);1279 }1280 return resume_offset;1281}1282 1283/* We run the 53c700 with selection interrupts always enabled. This1284 * means that the chip may be selected as soon as the bus frees. On a1285 * busy bus, this can be before the scripts engine finishes its1286 * processing. Therefore, part of the selection processing has to be1287 * to find out what the scripts engine is doing and complete the1288 * function if necessary (i.e. process the pending disconnect or save1289 * the interrupted initial selection */1290STATIC inline __u321291process_selection(struct Scsi_Host *host, __u32 dsp)1292{1293 __u8 id = 0; /* Squash compiler warning */1294 int count = 0;1295 __u32 resume_offset = 0;1296 struct NCR_700_Host_Parameters *hostdata =1297 (struct NCR_700_Host_Parameters *)host->hostdata[0];1298 struct scsi_cmnd *SCp = hostdata->cmd;1299 __u8 sbcl;1300 1301 for(count = 0; count < 5; count++) {1302 id = NCR_700_readb(host, hostdata->chip710 ?1303 CTEST9_REG : SFBR_REG);1304 1305 /* Take out our own ID */1306 id &= ~(1<<host->this_id);1307 if(id != 0) 1308 break;1309 udelay(5);1310 }1311 sbcl = NCR_700_readb(host, SBCL_REG);1312 if((sbcl & SBCL_IO) == 0) {1313 /* mark as having been selected rather than reselected */1314 id = 0xff;1315 } else {1316 /* convert to real ID */1317 hostdata->reselection_id = id = bitmap_to_number(id);1318 DEBUG(("scsi%d: Reselected by %d\n",1319 host->host_no, id));1320 }1321 if(hostdata->state == NCR_700_HOST_BUSY && SCp != NULL) {1322 struct NCR_700_command_slot *slot =1323 (struct NCR_700_command_slot *)SCp->host_scribble;1324 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));1325 1326 switch(dsp - hostdata->pScript) {1327 case Ent_Disconnect1:1328 case Ent_Disconnect2:1329 save_for_reselection(hostdata, SCp, Ent_Disconnect2 + hostdata->pScript);1330 break;1331 case Ent_Disconnect3:1332 case Ent_Disconnect4:1333 save_for_reselection(hostdata, SCp, Ent_Disconnect4 + hostdata->pScript);1334 break;1335 case Ent_Disconnect5:1336 case Ent_Disconnect6:1337 save_for_reselection(hostdata, SCp, Ent_Disconnect6 + hostdata->pScript);1338 break;1339 case Ent_Disconnect7:1340 case Ent_Disconnect8:1341 save_for_reselection(hostdata, SCp, Ent_Disconnect8 + hostdata->pScript);1342 break;1343 case Ent_Finish1:1344 case Ent_Finish2:1345 process_script_interrupt(A_GOOD_STATUS_AFTER_STATUS, dsp, SCp, host, hostdata);1346 break;1347 1348 default:1349 slot->state = NCR_700_SLOT_QUEUED;1350 break;1351 }1352 }1353 hostdata->state = NCR_700_HOST_BUSY;1354 hostdata->cmd = NULL;1355 /* clear any stale simple tag message */1356 hostdata->msgin[1] = 0;1357 dma_sync_to_dev(hostdata, hostdata->msgin, MSG_ARRAY_SIZE);1358 1359 if(id == 0xff) {1360 /* Selected as target, Ignore */1361 resume_offset = hostdata->pScript + Ent_SelectedAsTarget;1362 } else if(hostdata->tag_negotiated & (1<<id)) {1363 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;1364 } else {1365 resume_offset = hostdata->pScript + Ent_GetReselectionData;1366 }1367 return resume_offset;1368}1369 1370static inline void1371NCR_700_clear_fifo(struct Scsi_Host *host) {1372 const struct NCR_700_Host_Parameters *hostdata1373 = (struct NCR_700_Host_Parameters *)host->hostdata[0];1374 if(hostdata->chip710) {1375 NCR_700_writeb(CLR_FIFO_710, host, CTEST8_REG);1376 } else {1377 NCR_700_writeb(CLR_FIFO, host, DFIFO_REG);1378 }1379}1380 1381static inline void1382NCR_700_flush_fifo(struct Scsi_Host *host) {1383 const struct NCR_700_Host_Parameters *hostdata1384 = (struct NCR_700_Host_Parameters *)host->hostdata[0];1385 if(hostdata->chip710) {1386 NCR_700_writeb(FLUSH_DMA_FIFO_710, host, CTEST8_REG);1387 udelay(10);1388 NCR_700_writeb(0, host, CTEST8_REG);1389 } else {1390 NCR_700_writeb(FLUSH_DMA_FIFO, host, DFIFO_REG);1391 udelay(10);1392 NCR_700_writeb(0, host, DFIFO_REG);1393 }1394}1395 1396 1397/* The queue lock with interrupts disabled must be held on entry to1398 * this function */1399STATIC int1400NCR_700_start_command(struct scsi_cmnd *SCp)1401{1402 struct NCR_700_command_slot *slot =1403 (struct NCR_700_command_slot *)SCp->host_scribble;1404 struct NCR_700_Host_Parameters *hostdata =1405 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];1406 __u16 count = 1; /* for IDENTIFY message */1407 u8 lun = SCp->device->lun;1408 1409 if(hostdata->state != NCR_700_HOST_FREE) {1410 /* keep this inside the lock to close the race window where1411 * the running command finishes on another CPU while we don't1412 * change the state to queued on this one */1413 slot->state = NCR_700_SLOT_QUEUED;1414 1415 DEBUG(("scsi%d: host busy, queueing command %p, slot %p\n",1416 SCp->device->host->host_no, slot->cmnd, slot));1417 return 0;1418 }1419 hostdata->state = NCR_700_HOST_BUSY;1420 hostdata->cmd = SCp;1421 slot->state = NCR_700_SLOT_BUSY;1422 /* keep interrupts disabled until we have the command correctly1423 * set up so we cannot take a selection interrupt */1424 1425 hostdata->msgout[0] = NCR_700_identify((SCp->cmnd[0] != REQUEST_SENSE &&1426 slot->flags != NCR_700_FLAG_AUTOSENSE),1427 lun);1428 /* for INQUIRY or REQUEST_SENSE commands, we cannot be sure1429 * if the negotiated transfer parameters still hold, so1430 * always renegotiate them */1431 if(SCp->cmnd[0] == INQUIRY || SCp->cmnd[0] == REQUEST_SENSE ||1432 slot->flags == NCR_700_FLAG_AUTOSENSE) {1433 NCR_700_clear_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);1434 }1435 1436 /* REQUEST_SENSE is asking for contingent I_T_L(_Q) status.1437 * If a contingent allegiance condition exists, the device1438 * will refuse all tags, so send the request sense as untagged1439 * */1440 if((hostdata->tag_negotiated & (1<<scmd_id(SCp)))1441 && (slot->tag != SCSI_NO_TAG && SCp->cmnd[0] != REQUEST_SENSE &&1442 slot->flags != NCR_700_FLAG_AUTOSENSE)) {1443 count += spi_populate_tag_msg(&hostdata->msgout[count], SCp);1444 }1445 1446 if(hostdata->fast &&1447 NCR_700_is_flag_clear(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC)) {1448 count += spi_populate_sync_msg(&hostdata->msgout[count],1449 spi_period(SCp->device->sdev_target),1450 spi_offset(SCp->device->sdev_target));1451 NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);1452 }1453 1454 script_patch_16(hostdata, hostdata->script, MessageCount, count);1455 1456 script_patch_ID(hostdata, hostdata->script, Device_ID, 1<<scmd_id(SCp));1457 1458 script_patch_32_abs(hostdata, hostdata->script, CommandAddress,1459 slot->pCmd);1460 script_patch_16(hostdata, hostdata->script, CommandCount, SCp->cmd_len);1461 /* finally plumb the beginning of the SG list into the script1462 * */1463 script_patch_32_abs(hostdata, hostdata->script,1464 SGScriptStartAddress, to32bit(&slot->pSG[0].ins));1465 NCR_700_clear_fifo(SCp->device->host);1466 1467 if(slot->resume_offset == 0)1468 slot->resume_offset = hostdata->pScript;1469 /* now perform all the writebacks and invalidates */1470 dma_sync_to_dev(hostdata, hostdata->msgout, count);1471 dma_sync_from_dev(hostdata, hostdata->msgin, MSG_ARRAY_SIZE);1472 dma_sync_to_dev(hostdata, SCp->cmnd, SCp->cmd_len);1473 dma_sync_from_dev(hostdata, hostdata->status, 1);1474 1475 /* set the synchronous period/offset */1476 NCR_700_writeb(NCR_700_get_SXFER(SCp->device),1477 SCp->device->host, SXFER_REG);1478 NCR_700_writel(slot->temp, SCp->device->host, TEMP_REG);1479 NCR_700_writel(slot->resume_offset, SCp->device->host, DSP_REG);1480 1481 return 1;1482}1483 1484irqreturn_t1485NCR_700_intr(int irq, void *dev_id)1486{1487 struct Scsi_Host *host = (struct Scsi_Host *)dev_id;1488 struct NCR_700_Host_Parameters *hostdata =1489 (struct NCR_700_Host_Parameters *)host->hostdata[0];1490 __u8 istat;1491 __u32 resume_offset = 0;1492 __u8 pun = 0xff, lun = 0xff;1493 unsigned long flags;1494 int handled = 0;1495 1496 /* Use the host lock to serialise access to the 53c7001497 * hardware. Note: In future, we may need to take the queue1498 * lock to enter the done routines. When that happens, we1499 * need to ensure that for this driver, the host lock and the1500 * queue lock point to the same thing. */1501 spin_lock_irqsave(host->host_lock, flags);1502 if((istat = NCR_700_readb(host, ISTAT_REG))1503 & (SCSI_INT_PENDING | DMA_INT_PENDING)) {1504 __u32 dsps;1505 __u8 sstat0 = 0, dstat = 0;1506 __u32 dsp;1507 struct scsi_cmnd *SCp = hostdata->cmd;1508 1509 handled = 1;1510 1511 if(istat & SCSI_INT_PENDING) {1512 udelay(10);1513 1514 sstat0 = NCR_700_readb(host, SSTAT0_REG);1515 }1516 1517 if(istat & DMA_INT_PENDING) {1518 udelay(10);1519 1520 dstat = NCR_700_readb(host, DSTAT_REG);1521 }1522 1523 dsps = NCR_700_readl(host, DSPS_REG);1524 dsp = NCR_700_readl(host, DSP_REG);1525 1526 DEBUG(("scsi%d: istat %02x sstat0 %02x dstat %02x dsp %04x[%08x] dsps 0x%x\n",1527 host->host_no, istat, sstat0, dstat,1528 (dsp - (__u32)(hostdata->pScript))/4,1529 dsp, dsps));1530 1531 if(SCp != NULL) {1532 pun = SCp->device->id;1533 lun = SCp->device->lun;1534 }1535 1536 if(sstat0 & SCSI_RESET_DETECTED) {1537 struct scsi_device *SDp;1538 int i;1539 1540 hostdata->state = NCR_700_HOST_BUSY;1541 1542 printk(KERN_ERR "scsi%d: Bus Reset detected, executing command %p, slot %p, dsp %08x[%04x]\n",1543 host->host_no, SCp, SCp == NULL ? NULL : SCp->host_scribble, dsp, dsp - hostdata->pScript);1544 1545 scsi_report_bus_reset(host, 0);1546 1547 /* clear all the negotiated parameters */1548 __shost_for_each_device(SDp, host)1549 NCR_700_clear_flag(SDp, ~0);1550 1551 /* clear all the slots and their pending commands */1552 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {1553 struct scsi_cmnd *SCp;1554 struct NCR_700_command_slot *slot =1555 &hostdata->slots[i];1556 1557 if(slot->state == NCR_700_SLOT_FREE)1558 continue;1559 1560 SCp = slot->cmnd;1561 printk(KERN_ERR " failing command because of reset, slot %p, cmnd %p\n",1562 slot, SCp);1563 free_slot(slot, hostdata);1564 SCp->host_scribble = NULL;1565 NCR_700_set_depth(SCp->device, 0);1566 /* NOTE: deadlock potential here: we1567 * rely on mid-layer guarantees that1568 * scsi_done won't try to issue the1569 * command again otherwise we'll1570 * deadlock on the1571 * hostdata->state_lock */1572 SCp->result = DID_RESET << 16;1573 scsi_done(SCp);1574 }1575 mdelay(25);1576 NCR_700_chip_setup(host);1577 1578 hostdata->state = NCR_700_HOST_FREE;1579 hostdata->cmd = NULL;1580 /* signal back if this was an eh induced reset */1581 if(hostdata->eh_complete != NULL)1582 complete(hostdata->eh_complete);1583 goto out_unlock;1584 } else if(sstat0 & SELECTION_TIMEOUT) {1585 DEBUG(("scsi%d: (%d:%d) selection timeout\n",1586 host->host_no, pun, lun));1587 NCR_700_scsi_done(hostdata, SCp, DID_NO_CONNECT<<16);1588 } else if(sstat0 & PHASE_MISMATCH) {1589 struct NCR_700_command_slot *slot = (SCp == NULL) ? NULL :1590 (struct NCR_700_command_slot *)SCp->host_scribble;1591 1592 if(dsp == Ent_SendMessage + 8 + hostdata->pScript) {1593 /* It wants to reply to some part of1594 * our message */1595#ifdef NCR_700_DEBUG1596 __u32 temp = NCR_700_readl(host, TEMP_REG);1597 int count = (hostdata->script[Ent_SendMessage/4] & 0xffffff) - ((NCR_700_readl(host, DBC_REG) & 0xffffff) + NCR_700_data_residual(host));1598 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)));1599#endif1600 resume_offset = hostdata->pScript + Ent_SendMessagePhaseMismatch;1601 } else if (slot && dsp >= to32bit(&slot->pSG[0].ins) &&1602 dsp <= to32bit(&slot->pSG[NCR_700_SG_SEGMENTS].ins)) {1603 int data_transfer = NCR_700_readl(host, DBC_REG) & 0xffffff;1604 int SGcount = (dsp - to32bit(&slot->pSG[0].ins))/sizeof(struct NCR_700_SG_List);1605 int residual = NCR_700_data_residual(host);1606 int i;1607#ifdef NCR_700_DEBUG1608 __u32 naddr = NCR_700_readl(host, DNAD_REG);1609 1610 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x\n",1611 host->host_no, pun, lun,1612 SGcount, data_transfer);1613 scsi_print_command(SCp);1614 if(residual) {1615 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x, residual %d\n",1616 host->host_no, pun, lun,1617 SGcount, data_transfer, residual);1618 }1619#endif1620 data_transfer += residual;1621 1622 if(data_transfer != 0) {1623 int count; 1624 __u32 pAddr;1625 1626 SGcount--;1627 1628 count = (bS_to_cpu(slot->SG[SGcount].ins) & 0x00ffffff);1629 DEBUG(("DATA TRANSFER MISMATCH, count = %d, transferred %d\n", count, count-data_transfer));1630 slot->SG[SGcount].ins &= bS_to_host(0xff000000);1631 slot->SG[SGcount].ins |= bS_to_host(data_transfer);1632 pAddr = bS_to_cpu(slot->SG[SGcount].pAddr);1633 pAddr += (count - data_transfer);1634#ifdef NCR_700_DEBUG1635 if(pAddr != naddr) {1636 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);1637 }1638#endif1639 slot->SG[SGcount].pAddr = bS_to_host(pAddr);1640 }1641 /* set the executed moves to nops */1642 for(i=0; i<SGcount; i++) {1643 slot->SG[i].ins = bS_to_host(SCRIPT_NOP);1644 slot->SG[i].pAddr = 0;1645 }1646 dma_sync_to_dev(hostdata, slot->SG, sizeof(slot->SG));1647 /* and pretend we disconnected after1648 * the command phase */1649 resume_offset = hostdata->pScript + Ent_MsgInDuringData;1650 /* make sure all the data is flushed */1651 NCR_700_flush_fifo(host);1652 } else {1653 __u8 sbcl = NCR_700_readb(host, SBCL_REG);1654 printk(KERN_ERR "scsi%d: (%d:%d) phase mismatch at %04x, phase %s\n",1655 host->host_no, pun, lun, dsp - hostdata->pScript, sbcl_to_string(sbcl));1656 NCR_700_internal_bus_reset(host);1657 }1658 1659 } else if(sstat0 & SCSI_GROSS_ERROR) {1660 printk(KERN_ERR "scsi%d: (%d:%d) GROSS ERROR\n",1661 host->host_no, pun, lun);1662 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);1663 } else if(sstat0 & PARITY_ERROR) {1664 printk(KERN_ERR "scsi%d: (%d:%d) PARITY ERROR\n",1665 host->host_no, pun, lun);1666 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);1667 } else if(dstat & SCRIPT_INT_RECEIVED) {1668 DEBUG(("scsi%d: (%d:%d) ====>SCRIPT INTERRUPT<====\n",1669 host->host_no, pun, lun));1670 resume_offset = process_script_interrupt(dsps, dsp, SCp, host, hostdata);1671 } else if(dstat & (ILGL_INST_DETECTED)) {1672 printk(KERN_ERR "scsi%d: (%d:%d) Illegal Instruction detected at 0x%08x[0x%x]!!!\n"1673 " Please email James.Bottomley@HansenPartnership.com with the details\n",1674 host->host_no, pun, lun,1675 dsp, dsp - hostdata->pScript);1676 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);1677 } else if(dstat & (WATCH_DOG_INTERRUPT|ABORTED)) {1678 printk(KERN_ERR "scsi%d: (%d:%d) serious DMA problem, dstat=%02x\n",1679 host->host_no, pun, lun, dstat);1680 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);1681 }1682 1683 1684 /* NOTE: selection interrupt processing MUST occur1685 * after script interrupt processing to correctly cope1686 * with the case where we process a disconnect and1687 * then get reselected before we process the1688 * disconnection */1689 if(sstat0 & SELECTED) {1690 /* FIXME: It currently takes at least FOUR1691 * interrupts to complete a command that1692 * disconnects: one for the disconnect, one1693 * for the reselection, one to get the1694 * reselection data and one to complete the1695 * command. If we guess the reselected1696 * command here and prepare it, we only need1697 * to get a reselection data interrupt if we1698 * guessed wrongly. Since the interrupt1699 * overhead is much greater than the command1700 * setup, this would be an efficient1701 * optimisation particularly as we probably1702 * only have one outstanding command on a1703 * target most of the time */1704 1705 resume_offset = process_selection(host, dsp);1706 1707 }1708 1709 }1710 1711 if(resume_offset) {1712 if(hostdata->state != NCR_700_HOST_BUSY) {1713 printk(KERN_ERR "scsi%d: Driver error: resume at 0x%08x [0x%04x] with non busy host!\n",1714 host->host_no, resume_offset, resume_offset - hostdata->pScript);1715 hostdata->state = NCR_700_HOST_BUSY;1716 }1717 1718 DEBUG(("Attempting to resume at %x\n", resume_offset));1719 NCR_700_clear_fifo(host);1720 NCR_700_writel(resume_offset, host, DSP_REG);1721 } 1722 /* There is probably a technical no-no about this: If we're a1723 * shared interrupt and we got this interrupt because the1724 * other device needs servicing not us, we're still going to1725 * check our queued commands here---of course, there shouldn't1726 * be any outstanding.... */1727 if(hostdata->state == NCR_700_HOST_FREE) {1728 int i;1729 1730 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {1731 /* fairness: always run the queue from the last1732 * position we left off */1733 int j = (i + hostdata->saved_slot_position)1734 % NCR_700_COMMAND_SLOTS_PER_HOST;1735 1736 if(hostdata->slots[j].state != NCR_700_SLOT_QUEUED)1737 continue;1738 if(NCR_700_start_command(hostdata->slots[j].cmnd)) {1739 DEBUG(("scsi%d: Issuing saved command slot %p, cmd %p\t\n",1740 host->host_no, &hostdata->slots[j],1741 hostdata->slots[j].cmnd));1742 hostdata->saved_slot_position = j + 1;1743 }1744 1745 break;1746 }1747 }1748 out_unlock:1749 spin_unlock_irqrestore(host->host_lock, flags);1750 return IRQ_RETVAL(handled);1751}1752 1753static int NCR_700_queuecommand_lck(struct scsi_cmnd *SCp)1754{1755 struct NCR_700_Host_Parameters *hostdata = 1756 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];1757 __u32 move_ins;1758 struct NCR_700_command_slot *slot;1759 1760 if(hostdata->command_slot_count >= NCR_700_COMMAND_SLOTS_PER_HOST) {1761 /* We're over our allocation, this should never happen1762 * since we report the max allocation to the mid layer */1763 printk(KERN_WARNING "scsi%d: Command depth has gone over queue depth\n", SCp->device->host->host_no);1764 return 1;1765 }1766 /* check for untagged commands. We cannot have any outstanding1767 * commands if we accept them. Commands could be untagged because:1768 *1769 * - The tag negotiated bitmap is clear1770 * - The blk layer sent and untagged command1771 */1772 if(NCR_700_get_depth(SCp->device) != 01773 && (!(hostdata->tag_negotiated & (1<<scmd_id(SCp)))1774 || !(SCp->flags & SCMD_TAGGED))) {1775 CDEBUG(KERN_ERR, SCp, "has non zero depth %d\n",1776 NCR_700_get_depth(SCp->device));1777 return SCSI_MLQUEUE_DEVICE_BUSY;1778 }1779 if(NCR_700_get_depth(SCp->device) >= SCp->device->queue_depth) {1780 CDEBUG(KERN_ERR, SCp, "has max tag depth %d\n",1781 NCR_700_get_depth(SCp->device));1782 return SCSI_MLQUEUE_DEVICE_BUSY;1783 }1784 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) + 1);1785 1786 /* begin the command here */1787 /* no need to check for NULL, test for command_slot_count above1788 * ensures a slot is free */1789 slot = find_empty_slot(hostdata);1790 1791 slot->cmnd = SCp;1792 1793 SCp->host_scribble = (unsigned char *)slot;1794 1795#ifdef NCR_700_DEBUG1796 printk("53c700: scsi%d, command ", SCp->device->host->host_no);1797 scsi_print_command(SCp);1798#endif1799 if ((SCp->flags & SCMD_TAGGED)1800 && (hostdata->tag_negotiated &(1<<scmd_id(SCp))) == 01801 && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_START_TAG_NEGOTIATION) {1802 scmd_printk(KERN_ERR, SCp, "Enabling Tag Command Queuing\n");1803 hostdata->tag_negotiated |= (1<<scmd_id(SCp));1804 NCR_700_set_tag_neg_state(SCp->device, NCR_700_DURING_TAG_NEGOTIATION);1805 }1806 1807 /* here we may have to process an untagged command. The gate1808 * above ensures that this will be the only one outstanding,1809 * so clear the tag negotiated bit.1810 *1811 * FIXME: This will royally screw up on multiple LUN devices1812 * */1813 if (!(SCp->flags & SCMD_TAGGED)1814 && (hostdata->tag_negotiated &(1<<scmd_id(SCp)))) {1815 scmd_printk(KERN_INFO, SCp, "Disabling Tag Command Queuing\n");1816 hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));1817 }1818 1819 if ((hostdata->tag_negotiated & (1<<scmd_id(SCp))) &&1820 SCp->device->simple_tags) {1821 slot->tag = scsi_cmd_to_rq(SCp)->tag;1822 CDEBUG(KERN_DEBUG, SCp, "sending out tag %d, slot %p\n",1823 slot->tag, slot);1824 } else {1825 struct NCR_700_Device_Parameters *p = SCp->device->hostdata;1826 1827 slot->tag = SCSI_NO_TAG;1828 /* save current command for reselection */1829 p->current_cmnd = SCp;1830 }1831 /* sanity check: some of the commands generated by the mid-layer1832 * have an eccentric idea of their sc_data_direction */1833 if(!scsi_sg_count(SCp) && !scsi_bufflen(SCp) &&1834 SCp->sc_data_direction != DMA_NONE) {1835#ifdef NCR_700_DEBUG1836 printk("53c700: Command");1837 scsi_print_command(SCp);1838 printk("Has wrong data direction %d\n", SCp->sc_data_direction);1839#endif1840 SCp->sc_data_direction = DMA_NONE;1841 }1842 1843 switch (SCp->cmnd[0]) {1844 case REQUEST_SENSE:1845 /* clear the internal sense magic */1846 SCp->cmnd[6] = 0;1847 fallthrough;1848 default:1849 /* OK, get it from the command */1850 switch(SCp->sc_data_direction) {1851 case DMA_BIDIRECTIONAL:1852 default:1853 printk(KERN_ERR "53c700: Unknown command for data direction ");1854 scsi_print_command(SCp);1855 1856 move_ins = 0;1857 break;1858 case DMA_NONE:1859 move_ins = 0;1860 break;1861 case DMA_FROM_DEVICE:1862 move_ins = SCRIPT_MOVE_DATA_IN;1863 break;1864 case DMA_TO_DEVICE:1865 move_ins = SCRIPT_MOVE_DATA_OUT;1866 break;1867 }1868 }1869 1870 /* now build the scatter gather list */1871 if(move_ins != 0) {1872 int i;1873 int sg_count;1874 dma_addr_t vPtr = 0;1875 struct scatterlist *sg;1876 __u32 count = 0;1877 1878 sg_count = scsi_dma_map(SCp);1879 BUG_ON(sg_count < 0);1880 1881 scsi_for_each_sg(SCp, sg, sg_count, i) {1882 vPtr = sg_dma_address(sg);1883 count = sg_dma_len(sg);1884 1885 slot->SG[i].ins = bS_to_host(move_ins | count);1886 DEBUG((" scatter block %d: move %d[%08x] from 0x%lx\n",1887 i, count, slot->SG[i].ins, (unsigned long)vPtr));1888 slot->SG[i].pAddr = bS_to_host(vPtr);1889 }1890 slot->SG[i].ins = bS_to_host(SCRIPT_RETURN);1891 slot->SG[i].pAddr = 0;1892 dma_sync_to_dev(hostdata, slot->SG, sizeof(slot->SG));1893 DEBUG((" SETTING %p to %x\n",1894 (&slot->pSG[i].ins),1895 slot->SG[i].ins));1896 }1897 slot->resume_offset = 0;1898 slot->pCmd = dma_map_single(hostdata->dev, SCp->cmnd,1899 MAX_COMMAND_SIZE, DMA_TO_DEVICE);1900 NCR_700_start_command(SCp);1901 return 0;1902}1903 1904STATIC DEF_SCSI_QCMD(NCR_700_queuecommand)1905 1906STATIC int1907NCR_700_abort(struct scsi_cmnd * SCp)1908{1909 struct NCR_700_command_slot *slot;1910 1911 scmd_printk(KERN_INFO, SCp, "abort command\n");1912 1913 slot = (struct NCR_700_command_slot *)SCp->host_scribble;1914 1915 if(slot == NULL)1916 /* no outstanding command to abort */1917 return SUCCESS;1918 if(SCp->cmnd[0] == TEST_UNIT_READY) {1919 /* FIXME: This is because of a problem in the new1920 * error handler. When it is in error recovery, it1921 * will send a TUR to a device it thinks may still be1922 * showing a problem. If the TUR isn't responded to,1923 * it will abort it and mark the device off line.1924 * Unfortunately, it does no other error recovery, so1925 * this would leave us with an outstanding command1926 * occupying a slot. Rather than allow this to1927 * happen, we issue a bus reset to force all1928 * outstanding commands to terminate here. */1929 NCR_700_internal_bus_reset(SCp->device->host);1930 /* still drop through and return failed */1931 }1932 return FAILED;1933 1934}1935 1936STATIC int1937NCR_700_host_reset(struct scsi_cmnd * SCp)1938{1939 DECLARE_COMPLETION_ONSTACK(complete);1940 struct NCR_700_Host_Parameters *hostdata = 1941 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];1942 1943 scmd_printk(KERN_INFO, SCp,1944 "New error handler wants HOST reset, cmd %p\n\t", SCp);1945 scsi_print_command(SCp);1946 1947 /* In theory, eh_complete should always be null because the1948 * eh is single threaded, but just in case we're handling a1949 * reset via sg or something */1950 spin_lock_irq(SCp->device->host->host_lock);1951 while (hostdata->eh_complete != NULL) {1952 spin_unlock_irq(SCp->device->host->host_lock);1953 msleep_interruptible(100);1954 spin_lock_irq(SCp->device->host->host_lock);1955 }1956 1957 hostdata->eh_complete = &complete;1958 NCR_700_internal_bus_reset(SCp->device->host);1959 NCR_700_chip_reset(SCp->device->host);1960 1961 spin_unlock_irq(SCp->device->host->host_lock);1962 wait_for_completion(&complete);1963 spin_lock_irq(SCp->device->host->host_lock);1964 1965 hostdata->eh_complete = NULL;1966 /* Revalidate the transport parameters of the failing device */1967 if(hostdata->fast)1968 spi_schedule_dv_device(SCp->device);1969 1970 spin_unlock_irq(SCp->device->host->host_lock);1971 return SUCCESS;1972}1973 1974STATIC void1975NCR_700_set_period(struct scsi_target *STp, int period)1976{1977 struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);1978 struct NCR_700_Host_Parameters *hostdata = 1979 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];1980 1981 if(!hostdata->fast)1982 return;1983 1984 if(period < hostdata->min_period)1985 period = hostdata->min_period;1986 1987 spi_period(STp) = period;1988 spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |1989 NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);1990 spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;1991}1992 1993STATIC void1994NCR_700_set_offset(struct scsi_target *STp, int offset)1995{1996 struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);1997 struct NCR_700_Host_Parameters *hostdata = 1998 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];1999 int max_offset = hostdata->chip7102000 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET;2001 2002 if(!hostdata->fast)2003 return;2004 2005 if(offset > max_offset)2006 offset = max_offset;2007 2008 /* if we're currently async, make sure the period is reasonable */2009 if(spi_offset(STp) == 0 && (spi_period(STp) < hostdata->min_period ||2010 spi_period(STp) > 0xff))2011 spi_period(STp) = hostdata->min_period;2012 2013 spi_offset(STp) = offset;2014 spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |2015 NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);2016 spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;2017}2018 2019STATIC int2020NCR_700_slave_alloc(struct scsi_device *SDp)2021{2022 SDp->hostdata = kzalloc(sizeof(struct NCR_700_Device_Parameters),2023 GFP_KERNEL);2024 2025 if (!SDp->hostdata)2026 return -ENOMEM;2027 2028 return 0;2029}2030 2031STATIC int2032NCR_700_slave_configure(struct scsi_device *SDp)2033{2034 struct NCR_700_Host_Parameters *hostdata = 2035 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];2036 2037 /* to do here: allocate memory; build a queue_full list */2038 if(SDp->tagged_supported) {2039 scsi_change_queue_depth(SDp, NCR_700_DEFAULT_TAGS);2040 NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);2041 }2042 2043 if(hostdata->fast) {2044 /* Find the correct offset and period via domain validation */2045 if (!spi_initial_dv(SDp->sdev_target))2046 spi_dv_device(SDp);2047 } else {2048 spi_offset(SDp->sdev_target) = 0;2049 spi_period(SDp->sdev_target) = 0;2050 }2051 return 0;2052}2053 2054STATIC void2055NCR_700_slave_destroy(struct scsi_device *SDp)2056{2057 kfree(SDp->hostdata);2058 SDp->hostdata = NULL;2059}2060 2061static int2062NCR_700_change_queue_depth(struct scsi_device *SDp, int depth)2063{2064 if (depth > NCR_700_MAX_TAGS)2065 depth = NCR_700_MAX_TAGS;2066 return scsi_change_queue_depth(SDp, depth);2067}2068 2069static ssize_t2070NCR_700_show_active_tags(struct device *dev, struct device_attribute *attr, char *buf)2071{2072 struct scsi_device *SDp = to_scsi_device(dev);2073 2074 return sysfs_emit(buf, "%d\n", NCR_700_get_depth(SDp));2075}2076 2077static struct device_attribute NCR_700_active_tags_attr = {2078 .attr = {2079 .name = "active_tags",2080 .mode = S_IRUGO,2081 },2082 .show = NCR_700_show_active_tags,2083};2084 2085STATIC struct attribute *NCR_700_dev_attrs[] = {2086 &NCR_700_active_tags_attr.attr,2087 NULL,2088};2089 2090ATTRIBUTE_GROUPS(NCR_700_dev);2091 2092EXPORT_SYMBOL(NCR_700_detect);2093EXPORT_SYMBOL(NCR_700_release);2094EXPORT_SYMBOL(NCR_700_intr);2095 2096static struct spi_function_template NCR_700_transport_functions = {2097 .set_period = NCR_700_set_period,2098 .show_period = 1,2099 .set_offset = NCR_700_set_offset,2100 .show_offset = 1,2101};2102 2103static int __init NCR_700_init(void)2104{2105 NCR_700_transport_template = spi_attach_transport(&NCR_700_transport_functions);2106 if(!NCR_700_transport_template)2107 return -ENODEV;2108 return 0;2109}2110 2111static void __exit NCR_700_exit(void)2112{2113 spi_release_transport(NCR_700_transport_template);2114}2115 2116module_init(NCR_700_init);2117module_exit(NCR_700_exit);2118 2119