1 /* -*- mode: c; c-basic-offset: 8 -*- */
3 /* NCR (or Symbios) 53c700 and 53c700-66 Driver
5 * Copyright (C) 2001 by James.Bottomley@HansenPartnership.com
6 **-----------------------------------------------------------------------------
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.
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.
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.
22 **-----------------------------------------------------------------------------
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).
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.
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).
46 * 1. Better statistics in the proc fs
48 * 2. Implement message queue (queues SCSI messages like commands) and make
49 * the abort and device reset functions use them.
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).
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).
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.
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.
86 * Added support for the 53c710 chip (in 53c700 emulation mode only---no
87 * special 53c710 instructions or registers are used).
91 * More endianness/cache coherency changes.
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)
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.
101 * Thanks also go to Linuxcare Inc. for providing several PARISC
102 * machines for me to debug the driver on.
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.
112 * Initial modularisation from the D700. See NCR_D700.c for the rest of
115 #define NCR_700_VERSION "2.8"
117 #include <linux/kernel.h>
118 #include <linux/types.h>
119 #include <linux/string.h>
120 #include <linux/ioport.h>
121 #include <linux/delay.h>
122 #include <linux/spinlock.h>
123 #include <linux/completion.h>
124 #include <linux/sched.h>
125 #include <linux/init.h>
126 #include <linux/proc_fs.h>
127 #include <linux/blkdev.h>
128 #include <linux/module.h>
129 #include <linux/interrupt.h>
130 #include <linux/device.h>
132 #include <asm/system.h>
134 #include <asm/pgtable.h>
135 #include <asm/byteorder.h>
137 #include <scsi/scsi.h>
138 #include <scsi/scsi_cmnd.h>
139 #include <scsi/scsi_dbg.h>
140 #include <scsi/scsi_eh.h>
141 #include <scsi/scsi_host.h>
142 #include <scsi/scsi_tcq.h>
143 #include <scsi/scsi_transport.h>
144 #include <scsi/scsi_transport_spi.h>
148 /* NOTE: For 64 bit drivers there are points in the code where we use
149 * a non dereferenceable pointer to point to a structure in dma-able
150 * memory (which is 32 bits) so that we can use all of the structure
151 * operations but take the address at the end. This macro allows us
152 * to truncate the 64 bit pointer down to 32 bits without the compiler
154 #define to32bit(x) ((__u32)((unsigned long)(x)))
159 #define STATIC static
162 MODULE_AUTHOR("James Bottomley");
163 MODULE_DESCRIPTION("53c700 and 53c700-66 Driver");
164 MODULE_LICENSE("GPL");
166 /* This is the script */
167 #include "53c700_d.h"
170 STATIC int NCR_700_queuecommand(struct scsi_cmnd *, void (*done)(struct scsi_cmnd *));
171 STATIC int NCR_700_abort(struct scsi_cmnd * SCpnt);
172 STATIC int NCR_700_bus_reset(struct scsi_cmnd * SCpnt);
173 STATIC int NCR_700_host_reset(struct scsi_cmnd * SCpnt);
174 STATIC void NCR_700_chip_setup(struct Scsi_Host *host);
175 STATIC void NCR_700_chip_reset(struct Scsi_Host *host);
176 STATIC int NCR_700_slave_alloc(struct scsi_device *SDpnt);
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);
182 STATIC struct device_attribute *NCR_700_dev_attrs[];
184 STATIC struct scsi_transport_template *NCR_700_transport_template = NULL;
186 static char *NCR_700_phase[] = {
189 "before command phase",
190 "after command phase",
191 "after status phase",
192 "after data in phase",
193 "after data out phase",
197 static char *NCR_700_condition[] = {
205 "REJECT_MSG RECEIVED",
206 "DISCONNECT_MSG RECEIVED",
212 static char *NCR_700_fatal_messages[] = {
213 "unexpected message after reselection",
214 "still MSG_OUT after message injection",
215 "not MSG_IN after selection",
216 "Illegal message length received",
219 static char *NCR_700_SBCL_bits[] = {
230 static char *NCR_700_SBCL_to_phase[] = {
241 /* This translates the SDTR message offset and period to a value
242 * which can be loaded into the SXFER_REG.
244 * NOTE: According to SCSI-2, the true transfer period (in ns) is
245 * actually four times this period value */
247 NCR_700_offset_period_to_sxfer(struct NCR_700_Host_Parameters *hostdata,
248 __u8 offset, __u8 period)
252 __u8 min_xferp = (hostdata->chip710
253 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
254 __u8 max_offset = (hostdata->chip710
255 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET);
260 if(period < hostdata->min_period) {
261 printk(KERN_WARNING "53c700: Period %dns is less than this chip's minimum, setting to %d\n", period*4, NCR_700_MIN_PERIOD*4);
262 period = hostdata->min_period;
264 XFERP = (period*4 * hostdata->sync_clock)/1000 - 4;
265 if(offset > max_offset) {
266 printk(KERN_WARNING "53c700: Offset %d exceeds chip maximum, setting to %d\n",
270 if(XFERP < min_xferp) {
271 printk(KERN_WARNING "53c700: XFERP %d is less than minium, setting to %d\n",
275 return (offset & 0x0f) | (XFERP & 0x07)<<4;
279 NCR_700_get_SXFER(struct scsi_device *SDp)
281 struct NCR_700_Host_Parameters *hostdata =
282 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
284 return NCR_700_offset_period_to_sxfer(hostdata,
285 spi_offset(SDp->sdev_target),
286 spi_period(SDp->sdev_target));
290 NCR_700_detect(struct scsi_host_template *tpnt,
291 struct NCR_700_Host_Parameters *hostdata, struct device *dev)
293 dma_addr_t pScript, pSlots;
296 struct Scsi_Host *host;
297 static int banner = 0;
300 if(tpnt->sdev_attrs == NULL)
301 tpnt->sdev_attrs = NCR_700_dev_attrs;
303 memory = dma_alloc_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
304 &pScript, GFP_KERNEL);
306 printk(KERN_ERR "53c700: Failed to allocate memory for driver, detatching\n");
310 script = (__u32 *)memory;
311 hostdata->msgin = memory + MSGIN_OFFSET;
312 hostdata->msgout = memory + MSGOUT_OFFSET;
313 hostdata->status = memory + STATUS_OFFSET;
314 /* all of these offsets are L1_CACHE_BYTES separated. It is fatal
315 * if this isn't sufficient separation to avoid dma flushing issues */
316 BUG_ON(!dma_is_consistent(pScript) && L1_CACHE_BYTES < dma_get_cache_alignment());
317 hostdata->slots = (struct NCR_700_command_slot *)(memory + SLOTS_OFFSET);
320 pSlots = pScript + SLOTS_OFFSET;
322 /* Fill in the missing routines from the host template */
323 tpnt->queuecommand = NCR_700_queuecommand;
324 tpnt->eh_abort_handler = NCR_700_abort;
325 tpnt->eh_bus_reset_handler = NCR_700_bus_reset;
326 tpnt->eh_host_reset_handler = NCR_700_host_reset;
327 tpnt->can_queue = NCR_700_COMMAND_SLOTS_PER_HOST;
328 tpnt->sg_tablesize = NCR_700_SG_SEGMENTS;
329 tpnt->cmd_per_lun = NCR_700_CMD_PER_LUN;
330 tpnt->use_clustering = ENABLE_CLUSTERING;
331 tpnt->slave_configure = NCR_700_slave_configure;
332 tpnt->slave_destroy = NCR_700_slave_destroy;
333 tpnt->slave_alloc = NCR_700_slave_alloc;
334 tpnt->change_queue_depth = NCR_700_change_queue_depth;
335 tpnt->change_queue_type = NCR_700_change_queue_type;
337 if(tpnt->name == NULL)
338 tpnt->name = "53c700";
339 if(tpnt->proc_name == NULL)
340 tpnt->proc_name = "53c700";
342 host = scsi_host_alloc(tpnt, 4);
345 memset(hostdata->slots, 0, sizeof(struct NCR_700_command_slot)
346 * NCR_700_COMMAND_SLOTS_PER_HOST);
347 for (j = 0; j < NCR_700_COMMAND_SLOTS_PER_HOST; j++) {
348 dma_addr_t offset = (dma_addr_t)((unsigned long)&hostdata->slots[j].SG[0]
349 - (unsigned long)&hostdata->slots[0].SG[0]);
350 hostdata->slots[j].pSG = (struct NCR_700_SG_List *)((unsigned long)(pSlots + offset));
352 hostdata->free_list = &hostdata->slots[j];
354 hostdata->slots[j-1].ITL_forw = &hostdata->slots[j];
355 hostdata->slots[j].state = NCR_700_SLOT_FREE;
358 for (j = 0; j < ARRAY_SIZE(SCRIPT); j++)
359 script[j] = bS_to_host(SCRIPT[j]);
361 /* adjust all labels to be bus physical */
362 for (j = 0; j < PATCHES; j++)
363 script[LABELPATCHES[j]] = bS_to_host(pScript + SCRIPT[LABELPATCHES[j]]);
364 /* now patch up fixed addresses. */
365 script_patch_32(script, MessageLocation,
366 pScript + MSGOUT_OFFSET);
367 script_patch_32(script, StatusAddress,
368 pScript + STATUS_OFFSET);
369 script_patch_32(script, ReceiveMsgAddress,
370 pScript + MSGIN_OFFSET);
372 hostdata->script = script;
373 hostdata->pScript = pScript;
374 dma_sync_single_for_device(hostdata->dev, pScript, sizeof(SCRIPT), DMA_TO_DEVICE);
375 hostdata->state = NCR_700_HOST_FREE;
376 hostdata->cmd = NULL;
378 host->max_lun = NCR_700_MAX_LUNS;
379 BUG_ON(NCR_700_transport_template == NULL);
380 host->transportt = NCR_700_transport_template;
381 host->unique_id = (unsigned long)hostdata->base;
382 hostdata->eh_complete = NULL;
383 host->hostdata[0] = (unsigned long)hostdata;
385 NCR_700_writeb(0xff, host, CTEST9_REG);
386 if (hostdata->chip710)
387 hostdata->rev = (NCR_700_readb(host, CTEST8_REG)>>4) & 0x0f;
389 hostdata->rev = (NCR_700_readb(host, CTEST7_REG)>>4) & 0x0f;
390 hostdata->fast = (NCR_700_readb(host, CTEST9_REG) == 0);
392 printk(KERN_NOTICE "53c700: Version " NCR_700_VERSION " By James.Bottomley@HansenPartnership.com\n");
395 printk(KERN_NOTICE "scsi%d: %s rev %d %s\n", host->host_no,
396 hostdata->chip710 ? "53c710" :
397 (hostdata->fast ? "53c700-66" : "53c700"),
398 hostdata->rev, hostdata->differential ?
399 "(Differential)" : "");
401 NCR_700_chip_reset(host);
403 if (scsi_add_host(host, dev)) {
404 dev_printk(KERN_ERR, dev, "53c700: scsi_add_host failed\n");
409 spi_signalling(host) = hostdata->differential ? SPI_SIGNAL_HVD :
416 NCR_700_release(struct Scsi_Host *host)
418 struct NCR_700_Host_Parameters *hostdata =
419 (struct NCR_700_Host_Parameters *)host->hostdata[0];
421 dma_free_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
422 hostdata->script, hostdata->pScript);
427 NCR_700_identify(int can_disconnect, __u8 lun)
429 return IDENTIFY_BASE |
430 ((can_disconnect) ? 0x40 : 0) |
431 (lun & NCR_700_LUN_MASK);
435 * Function : static int data_residual (Scsi_Host *host)
437 * Purpose : return residual data count of what's in the chip. If you
438 * really want to know what this function is doing, it's almost a
439 * direct transcription of the algorithm described in the 53c710
440 * guide, except that the DBC and DFIFO registers are only 6 bits
443 * Inputs : host - SCSI host */
445 NCR_700_data_residual (struct Scsi_Host *host) {
446 struct NCR_700_Host_Parameters *hostdata =
447 (struct NCR_700_Host_Parameters *)host->hostdata[0];
448 int count, synchronous = 0;
451 if(hostdata->chip710) {
452 count = ((NCR_700_readb(host, DFIFO_REG) & 0x7f) -
453 (NCR_700_readl(host, DBC_REG) & 0x7f)) & 0x7f;
455 count = ((NCR_700_readb(host, DFIFO_REG) & 0x3f) -
456 (NCR_700_readl(host, DBC_REG) & 0x3f)) & 0x3f;
460 synchronous = NCR_700_readb(host, SXFER_REG) & 0x0f;
462 /* get the data direction */
463 ddir = NCR_700_readb(host, CTEST0_REG) & 0x01;
468 count += (NCR_700_readb(host, SSTAT2_REG) & 0xf0) >> 4;
470 if (NCR_700_readb(host, SSTAT1_REG) & SIDL_REG_FULL)
474 __u8 sstat = NCR_700_readb(host, SSTAT1_REG);
475 if (sstat & SODL_REG_FULL)
477 if (synchronous && (sstat & SODR_REG_FULL))
482 printk("RESIDUAL IS %d (ddir %d)\n", count, ddir);
487 /* print out the SCSI wires and corresponding phase from the SBCL register
490 sbcl_to_string(__u8 sbcl)
493 static char ret[256];
498 strcat(ret, NCR_700_SBCL_bits[i]);
500 strcat(ret, NCR_700_SBCL_to_phase[sbcl & 0x07]);
505 bitmap_to_number(__u8 bitmap)
509 for(i=0; i<8 && !(bitmap &(1<<i)); i++)
514 /* Pull a slot off the free list */
515 STATIC struct NCR_700_command_slot *
516 find_empty_slot(struct NCR_700_Host_Parameters *hostdata)
518 struct NCR_700_command_slot *slot = hostdata->free_list;
522 if(hostdata->command_slot_count != NCR_700_COMMAND_SLOTS_PER_HOST)
523 printk(KERN_ERR "SLOTS FULL, but count is %d, should be %d\n", hostdata->command_slot_count, NCR_700_COMMAND_SLOTS_PER_HOST);
527 if(slot->state != NCR_700_SLOT_FREE)
529 printk(KERN_ERR "BUSY SLOT ON FREE LIST!!!\n");
532 hostdata->free_list = slot->ITL_forw;
533 slot->ITL_forw = NULL;
536 /* NOTE: set the state to busy here, not queued, since this
537 * indicates the slot is in use and cannot be run by the IRQ
538 * finish routine. If we cannot queue the command when it
539 * is properly build, we then change to NCR_700_SLOT_QUEUED */
540 slot->state = NCR_700_SLOT_BUSY;
542 hostdata->command_slot_count++;
548 free_slot(struct NCR_700_command_slot *slot,
549 struct NCR_700_Host_Parameters *hostdata)
551 if((slot->state & NCR_700_SLOT_MASK) != NCR_700_SLOT_MAGIC) {
552 printk(KERN_ERR "53c700: SLOT %p is not MAGIC!!!\n", slot);
554 if(slot->state == NCR_700_SLOT_FREE) {
555 printk(KERN_ERR "53c700: SLOT %p is FREE!!!\n", slot);
558 slot->resume_offset = 0;
560 slot->state = NCR_700_SLOT_FREE;
561 slot->ITL_forw = hostdata->free_list;
562 hostdata->free_list = slot;
563 hostdata->command_slot_count--;
567 /* This routine really does very little. The command is indexed on
568 the ITL and (if tagged) the ITLQ lists in _queuecommand */
570 save_for_reselection(struct NCR_700_Host_Parameters *hostdata,
571 struct scsi_cmnd *SCp, __u32 dsp)
573 /* Its just possible that this gets executed twice */
575 struct NCR_700_command_slot *slot =
576 (struct NCR_700_command_slot *)SCp->host_scribble;
578 slot->resume_offset = dsp;
580 hostdata->state = NCR_700_HOST_FREE;
581 hostdata->cmd = NULL;
585 NCR_700_unmap(struct NCR_700_Host_Parameters *hostdata, struct scsi_cmnd *SCp,
586 struct NCR_700_command_slot *slot)
588 if(SCp->sc_data_direction != DMA_NONE &&
589 SCp->sc_data_direction != DMA_BIDIRECTIONAL) {
591 dma_unmap_sg(hostdata->dev, SCp->request_buffer,
592 SCp->use_sg, SCp->sc_data_direction);
594 dma_unmap_single(hostdata->dev, slot->dma_handle,
595 SCp->request_bufflen,
596 SCp->sc_data_direction);
602 NCR_700_scsi_done(struct NCR_700_Host_Parameters *hostdata,
603 struct scsi_cmnd *SCp, int result)
605 hostdata->state = NCR_700_HOST_FREE;
606 hostdata->cmd = NULL;
609 struct NCR_700_command_slot *slot =
610 (struct NCR_700_command_slot *)SCp->host_scribble;
612 dma_unmap_single(hostdata->dev, slot->pCmd,
613 sizeof(SCp->cmnd), DMA_TO_DEVICE);
614 if (slot->flags == NCR_700_FLAG_AUTOSENSE) {
615 char *cmnd = NCR_700_get_sense_cmnd(SCp->device);
617 printk(" ORIGINAL CMD %p RETURNED %d, new return is %d sense is\n",
618 SCp, SCp->cmnd[7], result);
619 scsi_print_sense("53c700", SCp);
622 dma_unmap_single(hostdata->dev, slot->dma_handle, sizeof(SCp->sense_buffer), DMA_FROM_DEVICE);
623 /* restore the old result if the request sense was
628 NCR_700_unmap(hostdata, SCp, slot);
630 free_slot(slot, hostdata);
632 if(NCR_700_get_depth(SCp->device) == 0 ||
633 NCR_700_get_depth(SCp->device) > SCp->device->queue_depth)
634 printk(KERN_ERR "Invalid depth in NCR_700_scsi_done(): %d\n",
635 NCR_700_get_depth(SCp->device));
636 #endif /* NCR_700_DEBUG */
637 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) - 1);
639 SCp->host_scribble = NULL;
640 SCp->result = result;
643 printk(KERN_ERR "53c700: SCSI DONE HAS NULL SCp\n");
649 NCR_700_internal_bus_reset(struct Scsi_Host *host)
652 NCR_700_writeb(ASSERT_RST, host, SCNTL1_REG);
654 NCR_700_writeb(0, host, SCNTL1_REG);
659 NCR_700_chip_setup(struct Scsi_Host *host)
661 struct NCR_700_Host_Parameters *hostdata =
662 (struct NCR_700_Host_Parameters *)host->hostdata[0];
663 __u32 dcntl_extra = 0;
665 __u8 min_xferp = (hostdata->chip710 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
667 if(hostdata->chip710) {
668 __u8 burst_disable = hostdata->burst_disable
670 dcntl_extra = COMPAT_700_MODE;
672 NCR_700_writeb(dcntl_extra, host, DCNTL_REG);
673 NCR_700_writeb(BURST_LENGTH_8 | hostdata->dmode_extra,
674 host, DMODE_710_REG);
675 NCR_700_writeb(burst_disable | (hostdata->differential ?
676 DIFF : 0), host, CTEST7_REG);
677 NCR_700_writeb(BTB_TIMER_DISABLE, host, CTEST0_REG);
678 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY | PARITY
679 | AUTO_ATN, host, SCNTL0_REG);
681 NCR_700_writeb(BURST_LENGTH_8 | hostdata->dmode_extra,
682 host, DMODE_700_REG);
683 NCR_700_writeb(hostdata->differential ?
684 DIFF : 0, host, CTEST7_REG);
686 /* this is for 700-66, does nothing on 700 */
687 NCR_700_writeb(LAST_DIS_ENBL | ENABLE_ACTIVE_NEGATION
688 | GENERATE_RECEIVE_PARITY, host,
691 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY
692 | PARITY | AUTO_ATN, host, SCNTL0_REG);
696 NCR_700_writeb(1 << host->this_id, host, SCID_REG);
697 NCR_700_writeb(0, host, SBCL_REG);
698 NCR_700_writeb(ASYNC_OPERATION, host, SXFER_REG);
700 NCR_700_writeb(PHASE_MM_INT | SEL_TIMEOUT_INT | GROSS_ERR_INT | UX_DISC_INT
701 | RST_INT | PAR_ERR_INT | SELECT_INT, host, SIEN_REG);
703 NCR_700_writeb(ABORT_INT | INT_INST_INT | ILGL_INST_INT, host, DIEN_REG);
704 NCR_700_writeb(ENABLE_SELECT, host, SCNTL1_REG);
705 if(hostdata->clock > 75) {
706 printk(KERN_ERR "53c700: Clock speed %dMHz is too high: 75Mhz is the maximum this chip can be driven at\n", hostdata->clock);
707 /* do the best we can, but the async clock will be out
708 * of spec: sync divider 2, async divider 3 */
709 DEBUG(("53c700: sync 2 async 3\n"));
710 NCR_700_writeb(SYNC_DIV_2_0, host, SBCL_REG);
711 NCR_700_writeb(ASYNC_DIV_3_0 | dcntl_extra, host, DCNTL_REG);
712 hostdata->sync_clock = hostdata->clock/2;
713 } else if(hostdata->clock > 50 && hostdata->clock <= 75) {
714 /* sync divider 1.5, async divider 3 */
715 DEBUG(("53c700: sync 1.5 async 3\n"));
716 NCR_700_writeb(SYNC_DIV_1_5, host, SBCL_REG);
717 NCR_700_writeb(ASYNC_DIV_3_0 | dcntl_extra, host, DCNTL_REG);
718 hostdata->sync_clock = hostdata->clock*2;
719 hostdata->sync_clock /= 3;
721 } else if(hostdata->clock > 37 && hostdata->clock <= 50) {
722 /* sync divider 1, async divider 2 */
723 DEBUG(("53c700: sync 1 async 2\n"));
724 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
725 NCR_700_writeb(ASYNC_DIV_2_0 | dcntl_extra, host, DCNTL_REG);
726 hostdata->sync_clock = hostdata->clock;
727 } else if(hostdata->clock > 25 && hostdata->clock <=37) {
728 /* sync divider 1, async divider 1.5 */
729 DEBUG(("53c700: sync 1 async 1.5\n"));
730 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
731 NCR_700_writeb(ASYNC_DIV_1_5 | dcntl_extra, host, DCNTL_REG);
732 hostdata->sync_clock = hostdata->clock;
734 DEBUG(("53c700: sync 1 async 1\n"));
735 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
736 NCR_700_writeb(ASYNC_DIV_1_0 | dcntl_extra, host, DCNTL_REG);
737 /* sync divider 1, async divider 1 */
738 hostdata->sync_clock = hostdata->clock;
740 /* Calculate the actual minimum period that can be supported
741 * by our synchronous clock speed. See the 710 manual for
742 * exact details of this calculation which is based on a
743 * setting of the SXFER register */
744 min_period = 1000*(4+min_xferp)/(4*hostdata->sync_clock);
745 hostdata->min_period = NCR_700_MIN_PERIOD;
746 if(min_period > NCR_700_MIN_PERIOD)
747 hostdata->min_period = min_period;
751 NCR_700_chip_reset(struct Scsi_Host *host)
753 struct NCR_700_Host_Parameters *hostdata =
754 (struct NCR_700_Host_Parameters *)host->hostdata[0];
755 if(hostdata->chip710) {
756 NCR_700_writeb(SOFTWARE_RESET_710, host, ISTAT_REG);
759 NCR_700_writeb(0, host, ISTAT_REG);
761 NCR_700_writeb(SOFTWARE_RESET, host, DCNTL_REG);
764 NCR_700_writeb(0, host, DCNTL_REG);
769 NCR_700_chip_setup(host);
772 /* The heart of the message processing engine is that the instruction
773 * immediately after the INT is the normal case (and so must be CLEAR
774 * ACK). If we want to do something else, we call that routine in
775 * scripts and set temp to be the normal case + 8 (skipping the CLEAR
776 * ACK) so that the routine returns correctly to resume its activity
779 process_extended_message(struct Scsi_Host *host,
780 struct NCR_700_Host_Parameters *hostdata,
781 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
783 __u32 resume_offset = dsp, temp = dsp + 8;
784 __u8 pun = 0xff, lun = 0xff;
787 pun = SCp->device->id;
788 lun = SCp->device->lun;
791 switch(hostdata->msgin[2]) {
793 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
794 struct scsi_target *starget = SCp->device->sdev_target;
795 __u8 period = hostdata->msgin[3];
796 __u8 offset = hostdata->msgin[4];
798 if(offset == 0 || period == 0) {
803 spi_offset(starget) = offset;
804 spi_period(starget) = period;
806 if(NCR_700_is_flag_set(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION)) {
807 spi_display_xfer_agreement(starget);
808 NCR_700_clear_flag(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION);
811 NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
812 NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
814 NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
818 /* SDTR message out of the blue, reject it */
819 shost_printk(KERN_WARNING, host,
820 "Unexpected SDTR msg\n");
821 hostdata->msgout[0] = A_REJECT_MSG;
822 dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
823 script_patch_16(hostdata->script, MessageCount, 1);
824 /* SendMsgOut returns, so set up the return
826 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
831 printk(KERN_INFO "scsi%d: (%d:%d), Unsolicited WDTR after CMD, Rejecting\n",
832 host->host_no, pun, lun);
833 hostdata->msgout[0] = A_REJECT_MSG;
834 dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
835 script_patch_16(hostdata->script, MessageCount, 1);
836 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
841 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
842 host->host_no, pun, lun,
843 NCR_700_phase[(dsps & 0xf00) >> 8]);
844 spi_print_msg(hostdata->msgin);
847 hostdata->msgout[0] = A_REJECT_MSG;
848 dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
849 script_patch_16(hostdata->script, MessageCount, 1);
850 /* SendMsgOut returns, so set up the return
852 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
854 NCR_700_writel(temp, host, TEMP_REG);
855 return resume_offset;
859 process_message(struct Scsi_Host *host, struct NCR_700_Host_Parameters *hostdata,
860 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
862 /* work out where to return to */
863 __u32 temp = dsp + 8, resume_offset = dsp;
864 __u8 pun = 0xff, lun = 0xff;
867 pun = SCp->device->id;
868 lun = SCp->device->lun;
872 printk("scsi%d (%d:%d): message %s: ", host->host_no, pun, lun,
873 NCR_700_phase[(dsps & 0xf00) >> 8]);
874 spi_print_msg(hostdata->msgin);
878 switch(hostdata->msgin[0]) {
881 resume_offset = process_extended_message(host, hostdata, SCp,
886 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
887 /* Rejected our sync negotiation attempt */
888 spi_period(SCp->device->sdev_target) =
889 spi_offset(SCp->device->sdev_target) = 0;
890 NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
891 NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
892 } else if(SCp != NULL && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION) {
893 /* rejected our first simple tag message */
894 scmd_printk(KERN_WARNING, SCp,
895 "Rejected first tag queue attempt, turning off tag queueing\n");
896 /* we're done negotiating */
897 NCR_700_set_tag_neg_state(SCp->device, NCR_700_FINISHED_TAG_NEGOTIATION);
898 hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
899 SCp->device->tagged_supported = 0;
900 scsi_deactivate_tcq(SCp->device, host->cmd_per_lun);
902 shost_printk(KERN_WARNING, host,
903 "(%d:%d) Unexpected REJECT Message %s\n",
905 NCR_700_phase[(dsps & 0xf00) >> 8]);
906 /* however, just ignore it */
910 case A_PARITY_ERROR_MSG:
911 printk(KERN_ERR "scsi%d (%d:%d) Parity Error!\n", host->host_no,
913 NCR_700_internal_bus_reset(host);
915 case A_SIMPLE_TAG_MSG:
916 printk(KERN_INFO "scsi%d (%d:%d) SIMPLE TAG %d %s\n", host->host_no,
917 pun, lun, hostdata->msgin[1],
918 NCR_700_phase[(dsps & 0xf00) >> 8]);
922 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
923 host->host_no, pun, lun,
924 NCR_700_phase[(dsps & 0xf00) >> 8]);
926 spi_print_msg(hostdata->msgin);
929 hostdata->msgout[0] = A_REJECT_MSG;
930 dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
931 script_patch_16(hostdata->script, MessageCount, 1);
932 /* SendMsgOut returns, so set up the return
934 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
938 NCR_700_writel(temp, host, TEMP_REG);
939 /* set us up to receive another message */
940 dma_cache_sync(hostdata->msgin, MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
941 return resume_offset;
945 process_script_interrupt(__u32 dsps, __u32 dsp, struct scsi_cmnd *SCp,
946 struct Scsi_Host *host,
947 struct NCR_700_Host_Parameters *hostdata)
949 __u32 resume_offset = 0;
950 __u8 pun = 0xff, lun=0xff;
953 pun = SCp->device->id;
954 lun = SCp->device->lun;
957 if(dsps == A_GOOD_STATUS_AFTER_STATUS) {
958 DEBUG((" COMMAND COMPLETE, status=%02x\n",
959 hostdata->status[0]));
960 /* OK, if TCQ still under negotiation, we now know it works */
961 if (NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION)
962 NCR_700_set_tag_neg_state(SCp->device,
963 NCR_700_FINISHED_TAG_NEGOTIATION);
965 /* check for contingent allegiance contitions */
966 if(status_byte(hostdata->status[0]) == CHECK_CONDITION ||
967 status_byte(hostdata->status[0]) == COMMAND_TERMINATED) {
968 struct NCR_700_command_slot *slot =
969 (struct NCR_700_command_slot *)SCp->host_scribble;
970 if(slot->flags == NCR_700_FLAG_AUTOSENSE) {
971 /* OOPS: bad device, returning another
972 * contingent allegiance condition */
973 scmd_printk(KERN_ERR, SCp,
974 "broken device is looping in contingent allegiance: ignoring\n");
975 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
978 NCR_700_get_sense_cmnd(SCp->device);
980 scsi_print_command(SCp);
981 printk(" cmd %p has status %d, requesting sense\n",
982 SCp, hostdata->status[0]);
984 /* we can destroy the command here
985 * because the contingent allegiance
986 * condition will cause a retry which
987 * will re-copy the command from the
988 * saved data_cmnd. We also unmap any
989 * data associated with the command
991 NCR_700_unmap(hostdata, SCp, slot);
992 dma_unmap_single(hostdata->dev, slot->pCmd,
996 cmnd[0] = REQUEST_SENSE;
997 cmnd[1] = (SCp->device->lun & 0x7) << 5;
1000 cmnd[4] = sizeof(SCp->sense_buffer);
1002 /* Here's a quiet hack: the
1003 * REQUEST_SENSE command is six bytes,
1004 * so store a flag indicating that
1005 * this was an internal sense request
1006 * and the original status at the end
1008 cmnd[6] = NCR_700_INTERNAL_SENSE_MAGIC;
1009 cmnd[7] = hostdata->status[0];
1010 slot->pCmd = dma_map_single(hostdata->dev, cmnd, MAX_COMMAND_SIZE, DMA_TO_DEVICE);
1011 slot->dma_handle = dma_map_single(hostdata->dev, SCp->sense_buffer, sizeof(SCp->sense_buffer), DMA_FROM_DEVICE);
1012 slot->SG[0].ins = bS_to_host(SCRIPT_MOVE_DATA_IN | sizeof(SCp->sense_buffer));
1013 slot->SG[0].pAddr = bS_to_host(slot->dma_handle);
1014 slot->SG[1].ins = bS_to_host(SCRIPT_RETURN);
1015 slot->SG[1].pAddr = 0;
1016 slot->resume_offset = hostdata->pScript;
1017 dma_cache_sync(slot->SG, sizeof(slot->SG[0])*2, DMA_TO_DEVICE);
1018 dma_cache_sync(SCp->sense_buffer, sizeof(SCp->sense_buffer), DMA_FROM_DEVICE);
1020 /* queue the command for reissue */
1021 slot->state = NCR_700_SLOT_QUEUED;
1022 slot->flags = NCR_700_FLAG_AUTOSENSE;
1023 hostdata->state = NCR_700_HOST_FREE;
1024 hostdata->cmd = NULL;
1027 // Currently rely on the mid layer evaluation
1028 // of the tag queuing capability
1030 //if(status_byte(hostdata->status[0]) == GOOD &&
1031 // SCp->cmnd[0] == INQUIRY && SCp->use_sg == 0) {
1032 // /* Piggy back the tag queueing support
1033 // * on this command */
1034 // dma_sync_single_for_cpu(hostdata->dev,
1035 // slot->dma_handle,
1036 // SCp->request_bufflen,
1037 // DMA_FROM_DEVICE);
1038 // if(((char *)SCp->request_buffer)[7] & 0x02) {
1039 // scmd_printk(KERN_INFO, SCp,
1040 // "Enabling Tag Command Queuing\n");
1041 // hostdata->tag_negotiated |= (1<<scmd_id(SCp));
1042 // NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1044 // NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1045 // hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
1048 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
1050 } else if((dsps & 0xfffff0f0) == A_UNEXPECTED_PHASE) {
1051 __u8 i = (dsps & 0xf00) >> 8;
1053 scmd_printk(KERN_ERR, SCp, "UNEXPECTED PHASE %s (%s)\n",
1055 sbcl_to_string(NCR_700_readb(host, SBCL_REG)));
1056 scmd_printk(KERN_ERR, SCp, " len = %d, cmd =",
1058 scsi_print_command(SCp);
1060 NCR_700_internal_bus_reset(host);
1061 } else if((dsps & 0xfffff000) == A_FATAL) {
1062 int i = (dsps & 0xfff);
1064 printk(KERN_ERR "scsi%d: (%d:%d) FATAL ERROR: %s\n",
1065 host->host_no, pun, lun, NCR_700_fatal_messages[i]);
1066 if(dsps == A_FATAL_ILLEGAL_MSG_LENGTH) {
1067 printk(KERN_ERR " msg begins %02x %02x\n",
1068 hostdata->msgin[0], hostdata->msgin[1]);
1070 NCR_700_internal_bus_reset(host);
1071 } else if((dsps & 0xfffff0f0) == A_DISCONNECT) {
1072 #ifdef NCR_700_DEBUG
1073 __u8 i = (dsps & 0xf00) >> 8;
1075 printk("scsi%d: (%d:%d), DISCONNECTED (%d) %s\n",
1076 host->host_no, pun, lun,
1077 i, NCR_700_phase[i]);
1079 save_for_reselection(hostdata, SCp, dsp);
1081 } else if(dsps == A_RESELECTION_IDENTIFIED) {
1083 struct NCR_700_command_slot *slot;
1084 __u8 reselection_id = hostdata->reselection_id;
1085 struct scsi_device *SDp;
1087 lun = hostdata->msgin[0] & 0x1f;
1089 hostdata->reselection_id = 0xff;
1090 DEBUG(("scsi%d: (%d:%d) RESELECTED!\n",
1091 host->host_no, reselection_id, lun));
1092 /* clear the reselection indicator */
1093 SDp = __scsi_device_lookup(host, 0, reselection_id, lun);
1094 if(unlikely(SDp == NULL)) {
1095 printk(KERN_ERR "scsi%d: (%d:%d) HAS NO device\n",
1096 host->host_no, reselection_id, lun);
1099 if(hostdata->msgin[1] == A_SIMPLE_TAG_MSG) {
1100 struct scsi_cmnd *SCp = scsi_find_tag(SDp, hostdata->msgin[2]);
1101 if(unlikely(SCp == NULL)) {
1102 printk(KERN_ERR "scsi%d: (%d:%d) no saved request for tag %d\n",
1103 host->host_no, reselection_id, lun, hostdata->msgin[2]);
1107 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1108 DDEBUG(KERN_DEBUG, SDp,
1109 "reselection is tag %d, slot %p(%d)\n",
1110 hostdata->msgin[2], slot, slot->tag);
1112 struct scsi_cmnd *SCp = scsi_find_tag(SDp, SCSI_NO_TAG);
1113 if(unlikely(SCp == NULL)) {
1114 sdev_printk(KERN_ERR, SDp,
1115 "no saved request for untagged cmd\n");
1118 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1122 printk(KERN_ERR "scsi%d: (%d:%d) RESELECTED but no saved command (MSG = %02x %02x %02x)!!\n",
1123 host->host_no, reselection_id, lun,
1124 hostdata->msgin[0], hostdata->msgin[1],
1125 hostdata->msgin[2]);
1127 if(hostdata->state != NCR_700_HOST_BUSY)
1128 printk(KERN_ERR "scsi%d: FATAL, host not busy during valid reselection!\n",
1130 resume_offset = slot->resume_offset;
1131 hostdata->cmd = slot->cmnd;
1133 /* re-patch for this command */
1134 script_patch_32_abs(hostdata->script, CommandAddress,
1136 script_patch_16(hostdata->script,
1137 CommandCount, slot->cmnd->cmd_len);
1138 script_patch_32_abs(hostdata->script, SGScriptStartAddress,
1139 to32bit(&slot->pSG[0].ins));
1141 /* Note: setting SXFER only works if we're
1142 * still in the MESSAGE phase, so it is vital
1143 * that ACK is still asserted when we process
1144 * the reselection message. The resume offset
1145 * should therefore always clear ACK */
1146 NCR_700_writeb(NCR_700_get_SXFER(hostdata->cmd->device),
1148 dma_cache_sync(hostdata->msgin,
1149 MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
1150 dma_cache_sync(hostdata->msgout,
1151 MSG_ARRAY_SIZE, DMA_TO_DEVICE);
1152 /* I'm just being paranoid here, the command should
1153 * already have been flushed from the cache */
1154 dma_cache_sync(slot->cmnd->cmnd,
1155 slot->cmnd->cmd_len, DMA_TO_DEVICE);
1160 } else if(dsps == A_RESELECTED_DURING_SELECTION) {
1162 /* This section is full of debugging code because I've
1163 * never managed to reach it. I think what happens is
1164 * that, because the 700 runs with selection
1165 * interrupts enabled the whole time that we take a
1166 * selection interrupt before we manage to get to the
1167 * reselected script interrupt */
1169 __u8 reselection_id = NCR_700_readb(host, SFBR_REG);
1170 struct NCR_700_command_slot *slot;
1172 /* Take out our own ID */
1173 reselection_id &= ~(1<<host->this_id);
1175 /* I've never seen this happen, so keep this as a printk rather
1177 printk(KERN_INFO "scsi%d: (%d:%d) RESELECTION DURING SELECTION, dsp=%08x[%04x] state=%d, count=%d\n",
1178 host->host_no, reselection_id, lun, dsp, dsp - hostdata->pScript, hostdata->state, hostdata->command_slot_count);
1181 /* FIXME: DEBUGGING CODE */
1182 __u32 SG = (__u32)bS_to_cpu(hostdata->script[A_SGScriptStartAddress_used[0]]);
1185 for(i=0; i< NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1186 if(SG >= to32bit(&hostdata->slots[i].pSG[0])
1187 && SG <= to32bit(&hostdata->slots[i].pSG[NCR_700_SG_SEGMENTS]))
1190 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);
1191 SCp = hostdata->slots[i].cmnd;
1195 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1196 /* change slot from busy to queued to redo command */
1197 slot->state = NCR_700_SLOT_QUEUED;
1199 hostdata->cmd = NULL;
1201 if(reselection_id == 0) {
1202 if(hostdata->reselection_id == 0xff) {
1203 printk(KERN_ERR "scsi%d: Invalid reselection during selection!!\n", host->host_no);
1206 printk(KERN_ERR "scsi%d: script reselected and we took a selection interrupt\n",
1208 reselection_id = hostdata->reselection_id;
1212 /* convert to real ID */
1213 reselection_id = bitmap_to_number(reselection_id);
1215 hostdata->reselection_id = reselection_id;
1216 /* just in case we have a stale simple tag message, clear it */
1217 hostdata->msgin[1] = 0;
1218 dma_cache_sync(hostdata->msgin,
1219 MSG_ARRAY_SIZE, DMA_BIDIRECTIONAL);
1220 if(hostdata->tag_negotiated & (1<<reselection_id)) {
1221 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1223 resume_offset = hostdata->pScript + Ent_GetReselectionData;
1225 } else if(dsps == A_COMPLETED_SELECTION_AS_TARGET) {
1226 /* we've just disconnected from the bus, do nothing since
1227 * a return here will re-run the queued command slot
1228 * that may have been interrupted by the initial selection */
1229 DEBUG((" SELECTION COMPLETED\n"));
1230 } else if((dsps & 0xfffff0f0) == A_MSG_IN) {
1231 resume_offset = process_message(host, hostdata, SCp,
1233 } else if((dsps & 0xfffff000) == 0) {
1234 __u8 i = (dsps & 0xf0) >> 4, j = (dsps & 0xf00) >> 8;
1235 printk(KERN_ERR "scsi%d: (%d:%d), unhandled script condition %s %s at %04x\n",
1236 host->host_no, pun, lun, NCR_700_condition[i],
1237 NCR_700_phase[j], dsp - hostdata->pScript);
1239 scsi_print_command(SCp);
1242 for(i = 0; i < SCp->use_sg + 1; i++) {
1243 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);
1247 NCR_700_internal_bus_reset(host);
1248 } else if((dsps & 0xfffff000) == A_DEBUG_INTERRUPT) {
1249 printk(KERN_NOTICE "scsi%d (%d:%d) DEBUG INTERRUPT %d AT %08x[%04x], continuing\n",
1250 host->host_no, pun, lun, dsps & 0xfff, dsp, dsp - hostdata->pScript);
1251 resume_offset = dsp;
1253 printk(KERN_ERR "scsi%d: (%d:%d), unidentified script interrupt 0x%x at %04x\n",
1254 host->host_no, pun, lun, dsps, dsp - hostdata->pScript);
1255 NCR_700_internal_bus_reset(host);
1257 return resume_offset;
1260 /* We run the 53c700 with selection interrupts always enabled. This
1261 * means that the chip may be selected as soon as the bus frees. On a
1262 * busy bus, this can be before the scripts engine finishes its
1263 * processing. Therefore, part of the selection processing has to be
1264 * to find out what the scripts engine is doing and complete the
1265 * function if necessary (i.e. process the pending disconnect or save
1266 * the interrupted initial selection */
1268 process_selection(struct Scsi_Host *host, __u32 dsp)
1270 __u8 id = 0; /* Squash compiler warning */
1272 __u32 resume_offset = 0;
1273 struct NCR_700_Host_Parameters *hostdata =
1274 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1275 struct scsi_cmnd *SCp = hostdata->cmd;
1278 for(count = 0; count < 5; count++) {
1279 id = NCR_700_readb(host, hostdata->chip710 ?
1280 CTEST9_REG : SFBR_REG);
1282 /* Take out our own ID */
1283 id &= ~(1<<host->this_id);
1288 sbcl = NCR_700_readb(host, SBCL_REG);
1289 if((sbcl & SBCL_IO) == 0) {
1290 /* mark as having been selected rather than reselected */
1293 /* convert to real ID */
1294 hostdata->reselection_id = id = bitmap_to_number(id);
1295 DEBUG(("scsi%d: Reselected by %d\n",
1296 host->host_no, id));
1298 if(hostdata->state == NCR_700_HOST_BUSY && SCp != NULL) {
1299 struct NCR_700_command_slot *slot =
1300 (struct NCR_700_command_slot *)SCp->host_scribble;
1301 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));
1303 switch(dsp - hostdata->pScript) {
1304 case Ent_Disconnect1:
1305 case Ent_Disconnect2:
1306 save_for_reselection(hostdata, SCp, Ent_Disconnect2 + hostdata->pScript);
1308 case Ent_Disconnect3:
1309 case Ent_Disconnect4:
1310 save_for_reselection(hostdata, SCp, Ent_Disconnect4 + hostdata->pScript);
1312 case Ent_Disconnect5:
1313 case Ent_Disconnect6:
1314 save_for_reselection(hostdata, SCp, Ent_Disconnect6 + hostdata->pScript);
1316 case Ent_Disconnect7:
1317 case Ent_Disconnect8:
1318 save_for_reselection(hostdata, SCp, Ent_Disconnect8 + hostdata->pScript);
1322 process_script_interrupt(A_GOOD_STATUS_AFTER_STATUS, dsp, SCp, host, hostdata);
1326 slot->state = NCR_700_SLOT_QUEUED;
1330 hostdata->state = NCR_700_HOST_BUSY;
1331 hostdata->cmd = NULL;
1332 /* clear any stale simple tag message */
1333 hostdata->msgin[1] = 0;
1334 dma_cache_sync(hostdata->msgin, MSG_ARRAY_SIZE,
1338 /* Selected as target, Ignore */
1339 resume_offset = hostdata->pScript + Ent_SelectedAsTarget;
1340 } else if(hostdata->tag_negotiated & (1<<id)) {
1341 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1343 resume_offset = hostdata->pScript + Ent_GetReselectionData;
1345 return resume_offset;
1349 NCR_700_clear_fifo(struct Scsi_Host *host) {
1350 const struct NCR_700_Host_Parameters *hostdata
1351 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1352 if(hostdata->chip710) {
1353 NCR_700_writeb(CLR_FIFO_710, host, CTEST8_REG);
1355 NCR_700_writeb(CLR_FIFO, host, DFIFO_REG);
1360 NCR_700_flush_fifo(struct Scsi_Host *host) {
1361 const struct NCR_700_Host_Parameters *hostdata
1362 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1363 if(hostdata->chip710) {
1364 NCR_700_writeb(FLUSH_DMA_FIFO_710, host, CTEST8_REG);
1366 NCR_700_writeb(0, host, CTEST8_REG);
1368 NCR_700_writeb(FLUSH_DMA_FIFO, host, DFIFO_REG);
1370 NCR_700_writeb(0, host, DFIFO_REG);
1375 /* The queue lock with interrupts disabled must be held on entry to
1378 NCR_700_start_command(struct scsi_cmnd *SCp)
1380 struct NCR_700_command_slot *slot =
1381 (struct NCR_700_command_slot *)SCp->host_scribble;
1382 struct NCR_700_Host_Parameters *hostdata =
1383 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1384 __u16 count = 1; /* for IDENTIFY message */
1386 if(hostdata->state != NCR_700_HOST_FREE) {
1387 /* keep this inside the lock to close the race window where
1388 * the running command finishes on another CPU while we don't
1389 * change the state to queued on this one */
1390 slot->state = NCR_700_SLOT_QUEUED;
1392 DEBUG(("scsi%d: host busy, queueing command %p, slot %p\n",
1393 SCp->device->host->host_no, slot->cmnd, slot));
1396 hostdata->state = NCR_700_HOST_BUSY;
1397 hostdata->cmd = SCp;
1398 slot->state = NCR_700_SLOT_BUSY;
1399 /* keep interrupts disabled until we have the command correctly
1400 * set up so we cannot take a selection interrupt */
1402 hostdata->msgout[0] = NCR_700_identify((SCp->cmnd[0] != REQUEST_SENSE &&
1403 slot->flags != NCR_700_FLAG_AUTOSENSE),
1405 /* for INQUIRY or REQUEST_SENSE commands, we cannot be sure
1406 * if the negotiated transfer parameters still hold, so
1407 * always renegotiate them */
1408 if(SCp->cmnd[0] == INQUIRY || SCp->cmnd[0] == REQUEST_SENSE ||
1409 slot->flags == NCR_700_FLAG_AUTOSENSE) {
1410 NCR_700_clear_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
1413 /* REQUEST_SENSE is asking for contingent I_T_L(_Q) status.
1414 * If a contingent allegiance condition exists, the device
1415 * will refuse all tags, so send the request sense as untagged
1417 if((hostdata->tag_negotiated & (1<<scmd_id(SCp)))
1418 && (slot->tag != SCSI_NO_TAG && SCp->cmnd[0] != REQUEST_SENSE &&
1419 slot->flags != NCR_700_FLAG_AUTOSENSE)) {
1420 count += scsi_populate_tag_msg(SCp, &hostdata->msgout[count]);
1423 if(hostdata->fast &&
1424 NCR_700_is_flag_clear(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC)) {
1425 count += spi_populate_sync_msg(&hostdata->msgout[count],
1426 spi_period(SCp->device->sdev_target),
1427 spi_offset(SCp->device->sdev_target));
1428 NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
1431 script_patch_16(hostdata->script, MessageCount, count);
1434 script_patch_ID(hostdata->script,
1435 Device_ID, 1<<scmd_id(SCp));
1437 script_patch_32_abs(hostdata->script, CommandAddress,
1439 script_patch_16(hostdata->script, CommandCount, SCp->cmd_len);
1440 /* finally plumb the beginning of the SG list into the script
1442 script_patch_32_abs(hostdata->script, SGScriptStartAddress,
1443 to32bit(&slot->pSG[0].ins));
1444 NCR_700_clear_fifo(SCp->device->host);
1446 if(slot->resume_offset == 0)
1447 slot->resume_offset = hostdata->pScript;
1448 /* now perform all the writebacks and invalidates */
1449 dma_cache_sync(hostdata->msgout, count, DMA_TO_DEVICE);
1450 dma_cache_sync(hostdata->msgin, MSG_ARRAY_SIZE,
1452 dma_cache_sync(SCp->cmnd, SCp->cmd_len, DMA_TO_DEVICE);
1453 dma_cache_sync(hostdata->status, 1, DMA_FROM_DEVICE);
1455 /* set the synchronous period/offset */
1456 NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
1457 SCp->device->host, SXFER_REG);
1458 NCR_700_writel(slot->temp, SCp->device->host, TEMP_REG);
1459 NCR_700_writel(slot->resume_offset, SCp->device->host, DSP_REG);
1465 NCR_700_intr(int irq, void *dev_id, struct pt_regs *regs)
1467 struct Scsi_Host *host = (struct Scsi_Host *)dev_id;
1468 struct NCR_700_Host_Parameters *hostdata =
1469 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1471 __u32 resume_offset = 0;
1472 __u8 pun = 0xff, lun = 0xff;
1473 unsigned long flags;
1476 /* Use the host lock to serialise acess to the 53c700
1477 * hardware. Note: In future, we may need to take the queue
1478 * lock to enter the done routines. When that happens, we
1479 * need to ensure that for this driver, the host lock and the
1480 * queue lock point to the same thing. */
1481 spin_lock_irqsave(host->host_lock, flags);
1482 if((istat = NCR_700_readb(host, ISTAT_REG))
1483 & (SCSI_INT_PENDING | DMA_INT_PENDING)) {
1485 __u8 sstat0 = 0, dstat = 0;
1487 struct scsi_cmnd *SCp = hostdata->cmd;
1488 enum NCR_700_Host_State state;
1491 state = hostdata->state;
1492 SCp = hostdata->cmd;
1494 if(istat & SCSI_INT_PENDING) {
1497 sstat0 = NCR_700_readb(host, SSTAT0_REG);
1500 if(istat & DMA_INT_PENDING) {
1503 dstat = NCR_700_readb(host, DSTAT_REG);
1506 dsps = NCR_700_readl(host, DSPS_REG);
1507 dsp = NCR_700_readl(host, DSP_REG);
1509 DEBUG(("scsi%d: istat %02x sstat0 %02x dstat %02x dsp %04x[%08x] dsps 0x%x\n",
1510 host->host_no, istat, sstat0, dstat,
1511 (dsp - (__u32)(hostdata->pScript))/4,
1515 pun = SCp->device->id;
1516 lun = SCp->device->lun;
1519 if(sstat0 & SCSI_RESET_DETECTED) {
1520 struct scsi_device *SDp;
1523 hostdata->state = NCR_700_HOST_BUSY;
1525 printk(KERN_ERR "scsi%d: Bus Reset detected, executing command %p, slot %p, dsp %08x[%04x]\n",
1526 host->host_no, SCp, SCp == NULL ? NULL : SCp->host_scribble, dsp, dsp - hostdata->pScript);
1528 scsi_report_bus_reset(host, 0);
1530 /* clear all the negotiated parameters */
1531 __shost_for_each_device(SDp, host)
1532 NCR_700_clear_flag(SDp, ~0);
1534 /* clear all the slots and their pending commands */
1535 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1536 struct scsi_cmnd *SCp;
1537 struct NCR_700_command_slot *slot =
1538 &hostdata->slots[i];
1540 if(slot->state == NCR_700_SLOT_FREE)
1544 printk(KERN_ERR " failing command because of reset, slot %p, cmnd %p\n",
1546 free_slot(slot, hostdata);
1547 SCp->host_scribble = NULL;
1548 NCR_700_set_depth(SCp->device, 0);
1549 /* NOTE: deadlock potential here: we
1550 * rely on mid-layer guarantees that
1551 * scsi_done won't try to issue the
1552 * command again otherwise we'll
1554 * hostdata->state_lock */
1555 SCp->result = DID_RESET << 16;
1556 SCp->scsi_done(SCp);
1559 NCR_700_chip_setup(host);
1561 hostdata->state = NCR_700_HOST_FREE;
1562 hostdata->cmd = NULL;
1563 /* signal back if this was an eh induced reset */
1564 if(hostdata->eh_complete != NULL)
1565 complete(hostdata->eh_complete);
1567 } else if(sstat0 & SELECTION_TIMEOUT) {
1568 DEBUG(("scsi%d: (%d:%d) selection timeout\n",
1569 host->host_no, pun, lun));
1570 NCR_700_scsi_done(hostdata, SCp, DID_NO_CONNECT<<16);
1571 } else if(sstat0 & PHASE_MISMATCH) {
1572 struct NCR_700_command_slot *slot = (SCp == NULL) ? NULL :
1573 (struct NCR_700_command_slot *)SCp->host_scribble;
1575 if(dsp == Ent_SendMessage + 8 + hostdata->pScript) {
1576 /* It wants to reply to some part of
1578 #ifdef NCR_700_DEBUG
1579 __u32 temp = NCR_700_readl(host, TEMP_REG);
1580 int count = (hostdata->script[Ent_SendMessage/4] & 0xffffff) - ((NCR_700_readl(host, DBC_REG) & 0xffffff) + NCR_700_data_residual(host));
1581 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)));
1583 resume_offset = hostdata->pScript + Ent_SendMessagePhaseMismatch;
1584 } else if(dsp >= to32bit(&slot->pSG[0].ins) &&
1585 dsp <= to32bit(&slot->pSG[NCR_700_SG_SEGMENTS].ins)) {
1586 int data_transfer = NCR_700_readl(host, DBC_REG) & 0xffffff;
1587 int SGcount = (dsp - to32bit(&slot->pSG[0].ins))/sizeof(struct NCR_700_SG_List);
1588 int residual = NCR_700_data_residual(host);
1590 #ifdef NCR_700_DEBUG
1591 __u32 naddr = NCR_700_readl(host, DNAD_REG);
1593 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x\n",
1594 host->host_no, pun, lun,
1595 SGcount, data_transfer);
1596 scsi_print_command(SCp);
1598 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x, residual %d\n",
1599 host->host_no, pun, lun,
1600 SGcount, data_transfer, residual);
1603 data_transfer += residual;
1605 if(data_transfer != 0) {
1611 count = (bS_to_cpu(slot->SG[SGcount].ins) & 0x00ffffff);
1612 DEBUG(("DATA TRANSFER MISMATCH, count = %d, transferred %d\n", count, count-data_transfer));
1613 slot->SG[SGcount].ins &= bS_to_host(0xff000000);
1614 slot->SG[SGcount].ins |= bS_to_host(data_transfer);
1615 pAddr = bS_to_cpu(slot->SG[SGcount].pAddr);
1616 pAddr += (count - data_transfer);
1617 #ifdef NCR_700_DEBUG
1618 if(pAddr != naddr) {
1619 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 slot->SG[SGcount].pAddr = bS_to_host(pAddr);
1624 /* set the executed moves to nops */
1625 for(i=0; i<SGcount; i++) {
1626 slot->SG[i].ins = bS_to_host(SCRIPT_NOP);
1627 slot->SG[i].pAddr = 0;
1629 dma_cache_sync(slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1630 /* and pretend we disconnected after
1631 * the command phase */
1632 resume_offset = hostdata->pScript + Ent_MsgInDuringData;
1633 /* make sure all the data is flushed */
1634 NCR_700_flush_fifo(host);
1636 __u8 sbcl = NCR_700_readb(host, SBCL_REG);
1637 printk(KERN_ERR "scsi%d: (%d:%d) phase mismatch at %04x, phase %s\n",
1638 host->host_no, pun, lun, dsp - hostdata->pScript, sbcl_to_string(sbcl));
1639 NCR_700_internal_bus_reset(host);
1642 } else if(sstat0 & SCSI_GROSS_ERROR) {
1643 printk(KERN_ERR "scsi%d: (%d:%d) GROSS ERROR\n",
1644 host->host_no, pun, lun);
1645 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1646 } else if(sstat0 & PARITY_ERROR) {
1647 printk(KERN_ERR "scsi%d: (%d:%d) PARITY ERROR\n",
1648 host->host_no, pun, lun);
1649 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1650 } else if(dstat & SCRIPT_INT_RECEIVED) {
1651 DEBUG(("scsi%d: (%d:%d) ====>SCRIPT INTERRUPT<====\n",
1652 host->host_no, pun, lun));
1653 resume_offset = process_script_interrupt(dsps, dsp, SCp, host, hostdata);
1654 } else if(dstat & (ILGL_INST_DETECTED)) {
1655 printk(KERN_ERR "scsi%d: (%d:%d) Illegal Instruction detected at 0x%08x[0x%x]!!!\n"
1656 " Please email James.Bottomley@HansenPartnership.com with the details\n",
1657 host->host_no, pun, lun,
1658 dsp, dsp - hostdata->pScript);
1659 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1660 } else if(dstat & (WATCH_DOG_INTERRUPT|ABORTED)) {
1661 printk(KERN_ERR "scsi%d: (%d:%d) serious DMA problem, dstat=%02x\n",
1662 host->host_no, pun, lun, dstat);
1663 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1667 /* NOTE: selection interrupt processing MUST occur
1668 * after script interrupt processing to correctly cope
1669 * with the case where we process a disconnect and
1670 * then get reselected before we process the
1672 if(sstat0 & SELECTED) {
1673 /* FIXME: It currently takes at least FOUR
1674 * interrupts to complete a command that
1675 * disconnects: one for the disconnect, one
1676 * for the reselection, one to get the
1677 * reselection data and one to complete the
1678 * command. If we guess the reselected
1679 * command here and prepare it, we only need
1680 * to get a reselection data interrupt if we
1681 * guessed wrongly. Since the interrupt
1682 * overhead is much greater than the command
1683 * setup, this would be an efficient
1684 * optimisation particularly as we probably
1685 * only have one outstanding command on a
1686 * target most of the time */
1688 resume_offset = process_selection(host, dsp);
1695 if(hostdata->state != NCR_700_HOST_BUSY) {
1696 printk(KERN_ERR "scsi%d: Driver error: resume at 0x%08x [0x%04x] with non busy host!\n",
1697 host->host_no, resume_offset, resume_offset - hostdata->pScript);
1698 hostdata->state = NCR_700_HOST_BUSY;
1701 DEBUG(("Attempting to resume at %x\n", resume_offset));
1702 NCR_700_clear_fifo(host);
1703 NCR_700_writel(resume_offset, host, DSP_REG);
1705 /* There is probably a technical no-no about this: If we're a
1706 * shared interrupt and we got this interrupt because the
1707 * other device needs servicing not us, we're still going to
1708 * check our queued commands here---of course, there shouldn't
1709 * be any outstanding.... */
1710 if(hostdata->state == NCR_700_HOST_FREE) {
1713 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1714 /* fairness: always run the queue from the last
1715 * position we left off */
1716 int j = (i + hostdata->saved_slot_position)
1717 % NCR_700_COMMAND_SLOTS_PER_HOST;
1719 if(hostdata->slots[j].state != NCR_700_SLOT_QUEUED)
1721 if(NCR_700_start_command(hostdata->slots[j].cmnd)) {
1722 DEBUG(("scsi%d: Issuing saved command slot %p, cmd %p\t\n",
1723 host->host_no, &hostdata->slots[j],
1724 hostdata->slots[j].cmnd));
1725 hostdata->saved_slot_position = j + 1;
1732 spin_unlock_irqrestore(host->host_lock, flags);
1733 return IRQ_RETVAL(handled);
1737 NCR_700_queuecommand(struct scsi_cmnd *SCp, void (*done)(struct scsi_cmnd *))
1739 struct NCR_700_Host_Parameters *hostdata =
1740 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1742 enum dma_data_direction direction;
1743 struct NCR_700_command_slot *slot;
1745 if(hostdata->command_slot_count >= NCR_700_COMMAND_SLOTS_PER_HOST) {
1746 /* We're over our allocation, this should never happen
1747 * since we report the max allocation to the mid layer */
1748 printk(KERN_WARNING "scsi%d: Command depth has gone over queue depth\n", SCp->device->host->host_no);
1751 /* check for untagged commands. We cannot have any outstanding
1752 * commands if we accept them. Commands could be untagged because:
1754 * - The tag negotiated bitmap is clear
1755 * - The blk layer sent and untagged command
1757 if(NCR_700_get_depth(SCp->device) != 0
1758 && (!(hostdata->tag_negotiated & (1<<scmd_id(SCp)))
1759 || !blk_rq_tagged(SCp->request))) {
1760 CDEBUG(KERN_ERR, SCp, "has non zero depth %d\n",
1761 NCR_700_get_depth(SCp->device));
1762 return SCSI_MLQUEUE_DEVICE_BUSY;
1764 if(NCR_700_get_depth(SCp->device) >= SCp->device->queue_depth) {
1765 CDEBUG(KERN_ERR, SCp, "has max tag depth %d\n",
1766 NCR_700_get_depth(SCp->device));
1767 return SCSI_MLQUEUE_DEVICE_BUSY;
1769 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) + 1);
1771 /* begin the command here */
1772 /* no need to check for NULL, test for command_slot_count above
1773 * ensures a slot is free */
1774 slot = find_empty_slot(hostdata);
1778 SCp->scsi_done = done;
1779 SCp->host_scribble = (unsigned char *)slot;
1780 SCp->SCp.ptr = NULL;
1781 SCp->SCp.buffer = NULL;
1783 #ifdef NCR_700_DEBUG
1784 printk("53c700: scsi%d, command ", SCp->device->host->host_no);
1785 scsi_print_command(SCp);
1787 if(blk_rq_tagged(SCp->request)
1788 && (hostdata->tag_negotiated &(1<<scmd_id(SCp))) == 0
1789 && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_START_TAG_NEGOTIATION) {
1790 scmd_printk(KERN_ERR, SCp, "Enabling Tag Command Queuing\n");
1791 hostdata->tag_negotiated |= (1<<scmd_id(SCp));
1792 NCR_700_set_tag_neg_state(SCp->device, NCR_700_DURING_TAG_NEGOTIATION);
1795 /* here we may have to process an untagged command. The gate
1796 * above ensures that this will be the only one outstanding,
1797 * so clear the tag negotiated bit.
1799 * FIXME: This will royally screw up on multiple LUN devices
1801 if(!blk_rq_tagged(SCp->request)
1802 && (hostdata->tag_negotiated &(1<<scmd_id(SCp)))) {
1803 scmd_printk(KERN_INFO, SCp, "Disabling Tag Command Queuing\n");
1804 hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
1807 if((hostdata->tag_negotiated &(1<<scmd_id(SCp)))
1808 && scsi_get_tag_type(SCp->device)) {
1809 slot->tag = SCp->request->tag;
1810 CDEBUG(KERN_DEBUG, SCp, "sending out tag %d, slot %p\n",
1813 slot->tag = SCSI_NO_TAG;
1814 /* must populate current_cmnd for scsi_find_tag to work */
1815 SCp->device->current_cmnd = SCp;
1817 /* sanity check: some of the commands generated by the mid-layer
1818 * have an eccentric idea of their sc_data_direction */
1819 if(!SCp->use_sg && !SCp->request_bufflen
1820 && SCp->sc_data_direction != DMA_NONE) {
1821 #ifdef NCR_700_DEBUG
1822 printk("53c700: Command");
1823 scsi_print_command(SCp);
1824 printk("Has wrong data direction %d\n", SCp->sc_data_direction);
1826 SCp->sc_data_direction = DMA_NONE;
1829 switch (SCp->cmnd[0]) {
1831 /* clear the internal sense magic */
1835 /* OK, get it from the command */
1836 switch(SCp->sc_data_direction) {
1837 case DMA_BIDIRECTIONAL:
1839 printk(KERN_ERR "53c700: Unknown command for data direction ");
1840 scsi_print_command(SCp);
1847 case DMA_FROM_DEVICE:
1848 move_ins = SCRIPT_MOVE_DATA_IN;
1851 move_ins = SCRIPT_MOVE_DATA_OUT;
1856 /* now build the scatter gather list */
1857 direction = SCp->sc_data_direction;
1861 dma_addr_t vPtr = 0;
1865 sg_count = dma_map_sg(hostdata->dev,
1866 SCp->request_buffer, SCp->use_sg,
1869 vPtr = dma_map_single(hostdata->dev,
1870 SCp->request_buffer,
1871 SCp->request_bufflen,
1873 count = SCp->request_bufflen;
1874 slot->dma_handle = vPtr;
1879 for(i = 0; i < sg_count; i++) {
1882 struct scatterlist *sg = SCp->request_buffer;
1884 vPtr = sg_dma_address(&sg[i]);
1885 count = sg_dma_len(&sg[i]);
1888 slot->SG[i].ins = bS_to_host(move_ins | count);
1889 DEBUG((" scatter block %d: move %d[%08x] from 0x%lx\n",
1890 i, count, slot->SG[i].ins, (unsigned long)vPtr));
1891 slot->SG[i].pAddr = bS_to_host(vPtr);
1893 slot->SG[i].ins = bS_to_host(SCRIPT_RETURN);
1894 slot->SG[i].pAddr = 0;
1895 dma_cache_sync(slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1896 DEBUG((" SETTING %08lx to %x\n",
1897 (&slot->pSG[i].ins),
1900 slot->resume_offset = 0;
1901 slot->pCmd = dma_map_single(hostdata->dev, SCp->cmnd,
1902 sizeof(SCp->cmnd), DMA_TO_DEVICE);
1903 NCR_700_start_command(SCp);
1908 NCR_700_abort(struct scsi_cmnd * SCp)
1910 struct NCR_700_command_slot *slot;
1912 scmd_printk(KERN_INFO, SCp,
1913 "New error handler wants to abort command\n\t");
1914 scsi_print_command(SCp);
1916 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1919 /* no outstanding command to abort */
1921 if(SCp->cmnd[0] == TEST_UNIT_READY) {
1922 /* FIXME: This is because of a problem in the new
1923 * error handler. When it is in error recovery, it
1924 * will send a TUR to a device it thinks may still be
1925 * showing a problem. If the TUR isn't responded to,
1926 * it will abort it and mark the device off line.
1927 * Unfortunately, it does no other error recovery, so
1928 * this would leave us with an outstanding command
1929 * occupying a slot. Rather than allow this to
1930 * happen, we issue a bus reset to force all
1931 * outstanding commands to terminate here. */
1932 NCR_700_internal_bus_reset(SCp->device->host);
1933 /* still drop through and return failed */
1940 NCR_700_bus_reset(struct scsi_cmnd * SCp)
1942 DECLARE_COMPLETION(complete);
1943 struct NCR_700_Host_Parameters *hostdata =
1944 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1946 scmd_printk(KERN_INFO, SCp,
1947 "New error handler wants BUS reset, cmd %p\n\t", SCp);
1948 scsi_print_command(SCp);
1950 /* In theory, eh_complete should always be null because the
1951 * eh is single threaded, but just in case we're handling a
1952 * reset via sg or something */
1953 spin_lock_irq(SCp->device->host->host_lock);
1954 while (hostdata->eh_complete != NULL) {
1955 spin_unlock_irq(SCp->device->host->host_lock);
1956 msleep_interruptible(100);
1957 spin_lock_irq(SCp->device->host->host_lock);
1960 hostdata->eh_complete = &complete;
1961 NCR_700_internal_bus_reset(SCp->device->host);
1963 spin_unlock_irq(SCp->device->host->host_lock);
1964 wait_for_completion(&complete);
1965 spin_lock_irq(SCp->device->host->host_lock);
1967 hostdata->eh_complete = NULL;
1968 /* Revalidate the transport parameters of the failing device */
1970 spi_schedule_dv_device(SCp->device);
1972 spin_unlock_irq(SCp->device->host->host_lock);
1977 NCR_700_host_reset(struct scsi_cmnd * SCp)
1979 scmd_printk(KERN_INFO, SCp, "New error handler wants HOST reset\n\t");
1980 scsi_print_command(SCp);
1982 spin_lock_irq(SCp->device->host->host_lock);
1984 NCR_700_internal_bus_reset(SCp->device->host);
1985 NCR_700_chip_reset(SCp->device->host);
1987 spin_unlock_irq(SCp->device->host->host_lock);
1993 NCR_700_set_period(struct scsi_target *STp, int period)
1995 struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
1996 struct NCR_700_Host_Parameters *hostdata =
1997 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
2002 if(period < hostdata->min_period)
2003 period = hostdata->min_period;
2005 spi_period(STp) = period;
2006 spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2007 NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2008 spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2012 NCR_700_set_offset(struct scsi_target *STp, int offset)
2014 struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
2015 struct NCR_700_Host_Parameters *hostdata =
2016 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
2017 int max_offset = hostdata->chip710
2018 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET;
2023 if(offset > max_offset)
2024 offset = max_offset;
2026 /* if we're currently async, make sure the period is reasonable */
2027 if(spi_offset(STp) == 0 && (spi_period(STp) < hostdata->min_period ||
2028 spi_period(STp) > 0xff))
2029 spi_period(STp) = hostdata->min_period;
2031 spi_offset(STp) = offset;
2032 spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2033 NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2034 spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2038 NCR_700_slave_alloc(struct scsi_device *SDp)
2040 SDp->hostdata = kzalloc(sizeof(struct NCR_700_Device_Parameters),
2050 NCR_700_slave_configure(struct scsi_device *SDp)
2052 struct NCR_700_Host_Parameters *hostdata =
2053 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2055 /* to do here: allocate memory; build a queue_full list */
2056 if(SDp->tagged_supported) {
2057 scsi_set_tag_type(SDp, MSG_ORDERED_TAG);
2058 scsi_activate_tcq(SDp, NCR_700_DEFAULT_TAGS);
2059 NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2061 /* initialise to default depth */
2062 scsi_adjust_queue_depth(SDp, 0, SDp->host->cmd_per_lun);
2064 if(hostdata->fast) {
2065 /* Find the correct offset and period via domain validation */
2066 if (!spi_initial_dv(SDp->sdev_target))
2069 spi_offset(SDp->sdev_target) = 0;
2070 spi_period(SDp->sdev_target) = 0;
2076 NCR_700_slave_destroy(struct scsi_device *SDp)
2078 kfree(SDp->hostdata);
2079 SDp->hostdata = NULL;
2083 NCR_700_change_queue_depth(struct scsi_device *SDp, int depth)
2085 if (depth > NCR_700_MAX_TAGS)
2086 depth = NCR_700_MAX_TAGS;
2088 scsi_adjust_queue_depth(SDp, scsi_get_tag_type(SDp), depth);
2092 static int NCR_700_change_queue_type(struct scsi_device *SDp, int tag_type)
2094 int change_tag = ((tag_type ==0 && scsi_get_tag_type(SDp) != 0)
2095 || (tag_type != 0 && scsi_get_tag_type(SDp) == 0));
2096 struct NCR_700_Host_Parameters *hostdata =
2097 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2099 scsi_set_tag_type(SDp, tag_type);
2101 /* We have a global (per target) flag to track whether TCQ is
2102 * enabled, so we'll be turning it off for the entire target here.
2103 * our tag algorithm will fail if we mix tagged and untagged commands,
2104 * so quiesce the device before doing this */
2106 scsi_target_quiesce(SDp->sdev_target);
2109 /* shift back to the default unqueued number of commands
2110 * (the user can still raise this) */
2111 scsi_deactivate_tcq(SDp, SDp->host->cmd_per_lun);
2112 hostdata->tag_negotiated &= ~(1 << sdev_id(SDp));
2114 /* Here, we cleared the negotiation flag above, so this
2115 * will force the driver to renegotiate */
2116 scsi_activate_tcq(SDp, SDp->queue_depth);
2118 NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2121 scsi_target_resume(SDp->sdev_target);
2127 NCR_700_show_active_tags(struct device *dev, struct device_attribute *attr, char *buf)
2129 struct scsi_device *SDp = to_scsi_device(dev);
2131 return snprintf(buf, 20, "%d\n", NCR_700_get_depth(SDp));
2134 static struct device_attribute NCR_700_active_tags_attr = {
2136 .name = "active_tags",
2139 .show = NCR_700_show_active_tags,
2142 STATIC struct device_attribute *NCR_700_dev_attrs[] = {
2143 &NCR_700_active_tags_attr,
2147 EXPORT_SYMBOL(NCR_700_detect);
2148 EXPORT_SYMBOL(NCR_700_release);
2149 EXPORT_SYMBOL(NCR_700_intr);
2151 static struct spi_function_template NCR_700_transport_functions = {
2152 .set_period = NCR_700_set_period,
2154 .set_offset = NCR_700_set_offset,
2158 static int __init NCR_700_init(void)
2160 NCR_700_transport_template = spi_attach_transport(&NCR_700_transport_functions);
2161 if(!NCR_700_transport_template)
2166 static void __exit NCR_700_exit(void)
2168 spi_release_transport(NCR_700_transport_template);
2171 module_init(NCR_700_init);
2172 module_exit(NCR_700_exit);
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