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/config.h>
118 #include <linux/kernel.h>
119 #include <linux/types.h>
120 #include <linux/string.h>
121 #include <linux/ioport.h>
122 #include <linux/delay.h>
123 #include <linux/spinlock.h>
124 #include <linux/completion.h>
125 #include <linux/sched.h>
126 #include <linux/init.h>
127 #include <linux/proc_fs.h>
128 #include <linux/blkdev.h>
129 #include <linux/module.h>
130 #include <linux/interrupt.h>
131 #include <linux/device.h>
133 #include <asm/system.h>
135 #include <asm/pgtable.h>
136 #include <asm/byteorder.h>
138 #include <scsi/scsi.h>
139 #include <scsi/scsi_cmnd.h>
140 #include <scsi/scsi_dbg.h>
141 #include <scsi/scsi_eh.h>
142 #include <scsi/scsi_host.h>
143 #include <scsi/scsi_tcq.h>
144 #include <scsi/scsi_transport.h>
145 #include <scsi/scsi_transport_spi.h>
149 /* NOTE: For 64 bit drivers there are points in the code where we use
150 * a non dereferenceable pointer to point to a structure in dma-able
151 * memory (which is 32 bits) so that we can use all of the structure
152 * operations but take the address at the end. This macro allows us
153 * to truncate the 64 bit pointer down to 32 bits without the compiler
155 #define to32bit(x) ((__u32)((unsigned long)(x)))
160 #define STATIC static
163 MODULE_AUTHOR("James Bottomley");
164 MODULE_DESCRIPTION("53c700 and 53c700-66 Driver");
165 MODULE_LICENSE("GPL");
167 /* This is the script */
168 #include "53c700_d.h"
171 STATIC int NCR_700_queuecommand(struct scsi_cmnd *, void (*done)(struct scsi_cmnd *));
172 STATIC int NCR_700_abort(struct scsi_cmnd * SCpnt);
173 STATIC int NCR_700_bus_reset(struct scsi_cmnd * SCpnt);
174 STATIC int NCR_700_host_reset(struct scsi_cmnd * SCpnt);
175 STATIC void NCR_700_chip_setup(struct Scsi_Host *host);
176 STATIC void NCR_700_chip_reset(struct Scsi_Host *host);
177 STATIC int NCR_700_slave_configure(struct scsi_device *SDpnt);
178 STATIC void NCR_700_slave_destroy(struct scsi_device *SDpnt);
179 static int NCR_700_change_queue_depth(struct scsi_device *SDpnt, int depth);
180 static int NCR_700_change_queue_type(struct scsi_device *SDpnt, int depth);
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->change_queue_depth = NCR_700_change_queue_depth;
334 tpnt->change_queue_type = NCR_700_change_queue_type;
336 if(tpnt->name == NULL)
337 tpnt->name = "53c700";
338 if(tpnt->proc_name == NULL)
339 tpnt->proc_name = "53c700";
341 host = scsi_host_alloc(tpnt, 4);
344 memset(hostdata->slots, 0, sizeof(struct NCR_700_command_slot)
345 * NCR_700_COMMAND_SLOTS_PER_HOST);
346 for (j = 0; j < NCR_700_COMMAND_SLOTS_PER_HOST; j++) {
347 dma_addr_t offset = (dma_addr_t)((unsigned long)&hostdata->slots[j].SG[0]
348 - (unsigned long)&hostdata->slots[0].SG[0]);
349 hostdata->slots[j].pSG = (struct NCR_700_SG_List *)((unsigned long)(pSlots + offset));
351 hostdata->free_list = &hostdata->slots[j];
353 hostdata->slots[j-1].ITL_forw = &hostdata->slots[j];
354 hostdata->slots[j].state = NCR_700_SLOT_FREE;
357 for (j = 0; j < ARRAY_SIZE(SCRIPT); j++)
358 script[j] = bS_to_host(SCRIPT[j]);
360 /* adjust all labels to be bus physical */
361 for (j = 0; j < PATCHES; j++)
362 script[LABELPATCHES[j]] = bS_to_host(pScript + SCRIPT[LABELPATCHES[j]]);
363 /* now patch up fixed addresses. */
364 script_patch_32(script, MessageLocation,
365 pScript + MSGOUT_OFFSET);
366 script_patch_32(script, StatusAddress,
367 pScript + STATUS_OFFSET);
368 script_patch_32(script, ReceiveMsgAddress,
369 pScript + MSGIN_OFFSET);
371 hostdata->script = script;
372 hostdata->pScript = pScript;
373 dma_sync_single_for_device(hostdata->dev, pScript, sizeof(SCRIPT), DMA_TO_DEVICE);
374 hostdata->state = NCR_700_HOST_FREE;
375 hostdata->cmd = NULL;
377 host->max_lun = NCR_700_MAX_LUNS;
378 BUG_ON(NCR_700_transport_template == NULL);
379 host->transportt = NCR_700_transport_template;
380 host->unique_id = (unsigned long)hostdata->base;
381 hostdata->eh_complete = NULL;
382 host->hostdata[0] = (unsigned long)hostdata;
384 NCR_700_writeb(0xff, host, CTEST9_REG);
385 if (hostdata->chip710)
386 hostdata->rev = (NCR_700_readb(host, CTEST8_REG)>>4) & 0x0f;
388 hostdata->rev = (NCR_700_readb(host, CTEST7_REG)>>4) & 0x0f;
389 hostdata->fast = (NCR_700_readb(host, CTEST9_REG) == 0);
391 printk(KERN_NOTICE "53c700: Version " NCR_700_VERSION " By James.Bottomley@HansenPartnership.com\n");
394 printk(KERN_NOTICE "scsi%d: %s rev %d %s\n", host->host_no,
395 hostdata->chip710 ? "53c710" :
396 (hostdata->fast ? "53c700-66" : "53c700"),
397 hostdata->rev, hostdata->differential ?
398 "(Differential)" : "");
400 NCR_700_chip_reset(host);
402 if (scsi_add_host(host, dev)) {
403 dev_printk(KERN_ERR, dev, "53c700: scsi_add_host failed\n");
408 spi_signalling(host) = hostdata->differential ? SPI_SIGNAL_HVD :
415 NCR_700_release(struct Scsi_Host *host)
417 struct NCR_700_Host_Parameters *hostdata =
418 (struct NCR_700_Host_Parameters *)host->hostdata[0];
420 dma_free_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
421 hostdata->script, hostdata->pScript);
426 NCR_700_identify(int can_disconnect, __u8 lun)
428 return IDENTIFY_BASE |
429 ((can_disconnect) ? 0x40 : 0) |
430 (lun & NCR_700_LUN_MASK);
434 * Function : static int data_residual (Scsi_Host *host)
436 * Purpose : return residual data count of what's in the chip. If you
437 * really want to know what this function is doing, it's almost a
438 * direct transcription of the algorithm described in the 53c710
439 * guide, except that the DBC and DFIFO registers are only 6 bits
442 * Inputs : host - SCSI host */
444 NCR_700_data_residual (struct Scsi_Host *host) {
445 struct NCR_700_Host_Parameters *hostdata =
446 (struct NCR_700_Host_Parameters *)host->hostdata[0];
447 int count, synchronous = 0;
450 if(hostdata->chip710) {
451 count = ((NCR_700_readb(host, DFIFO_REG) & 0x7f) -
452 (NCR_700_readl(host, DBC_REG) & 0x7f)) & 0x7f;
454 count = ((NCR_700_readb(host, DFIFO_REG) & 0x3f) -
455 (NCR_700_readl(host, DBC_REG) & 0x3f)) & 0x3f;
459 synchronous = NCR_700_readb(host, SXFER_REG) & 0x0f;
461 /* get the data direction */
462 ddir = NCR_700_readb(host, CTEST0_REG) & 0x01;
467 count += (NCR_700_readb(host, SSTAT2_REG) & 0xf0) >> 4;
469 if (NCR_700_readb(host, SSTAT1_REG) & SIDL_REG_FULL)
473 __u8 sstat = NCR_700_readb(host, SSTAT1_REG);
474 if (sstat & SODL_REG_FULL)
476 if (synchronous && (sstat & SODR_REG_FULL))
481 printk("RESIDUAL IS %d (ddir %d)\n", count, ddir);
486 /* print out the SCSI wires and corresponding phase from the SBCL register
489 sbcl_to_string(__u8 sbcl)
492 static char ret[256];
497 strcat(ret, NCR_700_SBCL_bits[i]);
499 strcat(ret, NCR_700_SBCL_to_phase[sbcl & 0x07]);
504 bitmap_to_number(__u8 bitmap)
508 for(i=0; i<8 && !(bitmap &(1<<i)); i++)
513 /* Pull a slot off the free list */
514 STATIC struct NCR_700_command_slot *
515 find_empty_slot(struct NCR_700_Host_Parameters *hostdata)
517 struct NCR_700_command_slot *slot = hostdata->free_list;
521 if(hostdata->command_slot_count != NCR_700_COMMAND_SLOTS_PER_HOST)
522 printk(KERN_ERR "SLOTS FULL, but count is %d, should be %d\n", hostdata->command_slot_count, NCR_700_COMMAND_SLOTS_PER_HOST);
526 if(slot->state != NCR_700_SLOT_FREE)
528 printk(KERN_ERR "BUSY SLOT ON FREE LIST!!!\n");
531 hostdata->free_list = slot->ITL_forw;
532 slot->ITL_forw = NULL;
535 /* NOTE: set the state to busy here, not queued, since this
536 * indicates the slot is in use and cannot be run by the IRQ
537 * finish routine. If we cannot queue the command when it
538 * is properly build, we then change to NCR_700_SLOT_QUEUED */
539 slot->state = NCR_700_SLOT_BUSY;
540 hostdata->command_slot_count++;
546 free_slot(struct NCR_700_command_slot *slot,
547 struct NCR_700_Host_Parameters *hostdata)
549 if((slot->state & NCR_700_SLOT_MASK) != NCR_700_SLOT_MAGIC) {
550 printk(KERN_ERR "53c700: SLOT %p is not MAGIC!!!\n", slot);
552 if(slot->state == NCR_700_SLOT_FREE) {
553 printk(KERN_ERR "53c700: SLOT %p is FREE!!!\n", slot);
556 slot->resume_offset = 0;
558 slot->state = NCR_700_SLOT_FREE;
559 slot->ITL_forw = hostdata->free_list;
560 hostdata->free_list = slot;
561 hostdata->command_slot_count--;
565 /* This routine really does very little. The command is indexed on
566 the ITL and (if tagged) the ITLQ lists in _queuecommand */
568 save_for_reselection(struct NCR_700_Host_Parameters *hostdata,
569 struct scsi_cmnd *SCp, __u32 dsp)
571 /* Its just possible that this gets executed twice */
573 struct NCR_700_command_slot *slot =
574 (struct NCR_700_command_slot *)SCp->host_scribble;
576 slot->resume_offset = dsp;
578 hostdata->state = NCR_700_HOST_FREE;
579 hostdata->cmd = NULL;
583 NCR_700_unmap(struct NCR_700_Host_Parameters *hostdata, struct scsi_cmnd *SCp,
584 struct NCR_700_command_slot *slot)
586 if(SCp->sc_data_direction != DMA_NONE &&
587 SCp->sc_data_direction != DMA_BIDIRECTIONAL) {
589 dma_unmap_sg(hostdata->dev, SCp->buffer,
590 SCp->use_sg, SCp->sc_data_direction);
592 dma_unmap_single(hostdata->dev, slot->dma_handle,
593 SCp->request_bufflen,
594 SCp->sc_data_direction);
600 NCR_700_scsi_done(struct NCR_700_Host_Parameters *hostdata,
601 struct scsi_cmnd *SCp, int result)
603 hostdata->state = NCR_700_HOST_FREE;
604 hostdata->cmd = NULL;
607 struct NCR_700_command_slot *slot =
608 (struct NCR_700_command_slot *)SCp->host_scribble;
610 NCR_700_unmap(hostdata, SCp, slot);
611 dma_unmap_single(hostdata->dev, slot->pCmd,
612 sizeof(SCp->cmnd), DMA_TO_DEVICE);
613 if(SCp->cmnd[0] == REQUEST_SENSE && SCp->cmnd[6] == NCR_700_INTERNAL_SENSE_MAGIC) {
615 printk(" ORIGINAL CMD %p RETURNED %d, new return is %d sense is\n",
616 SCp, SCp->cmnd[7], result);
617 scsi_print_sense("53c700", SCp);
620 /* restore the old result if the request sense was
623 result = SCp->cmnd[7];
624 /* now restore the original command */
625 memcpy((void *) SCp->cmnd, (void *) SCp->data_cmnd,
626 sizeof(SCp->data_cmnd));
627 SCp->request_buffer = SCp->buffer;
628 SCp->request_bufflen = SCp->bufflen;
629 SCp->use_sg = SCp->old_use_sg;
630 SCp->cmd_len = SCp->old_cmd_len;
631 SCp->sc_data_direction = SCp->sc_old_data_direction;
632 SCp->underflow = SCp->old_underflow;
635 free_slot(slot, hostdata);
637 if(NCR_700_get_depth(SCp->device) == 0 ||
638 NCR_700_get_depth(SCp->device) > SCp->device->queue_depth)
639 printk(KERN_ERR "Invalid depth in NCR_700_scsi_done(): %d\n",
640 NCR_700_get_depth(SCp->device));
641 #endif /* NCR_700_DEBUG */
642 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) - 1);
644 SCp->host_scribble = NULL;
645 SCp->result = result;
648 printk(KERN_ERR "53c700: SCSI DONE HAS NULL SCp\n");
654 NCR_700_internal_bus_reset(struct Scsi_Host *host)
657 NCR_700_writeb(ASSERT_RST, host, SCNTL1_REG);
659 NCR_700_writeb(0, host, SCNTL1_REG);
664 NCR_700_chip_setup(struct Scsi_Host *host)
666 struct NCR_700_Host_Parameters *hostdata =
667 (struct NCR_700_Host_Parameters *)host->hostdata[0];
668 __u32 dcntl_extra = 0;
670 __u8 min_xferp = (hostdata->chip710 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
672 if(hostdata->chip710) {
673 __u8 burst_disable = hostdata->burst_disable
675 dcntl_extra = COMPAT_700_MODE;
677 NCR_700_writeb(dcntl_extra, host, DCNTL_REG);
678 NCR_700_writeb(BURST_LENGTH_8 | hostdata->dmode_extra,
679 host, DMODE_710_REG);
680 NCR_700_writeb(burst_disable | (hostdata->differential ?
681 DIFF : 0), host, CTEST7_REG);
682 NCR_700_writeb(BTB_TIMER_DISABLE, host, CTEST0_REG);
683 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY | PARITY
684 | AUTO_ATN, host, SCNTL0_REG);
686 NCR_700_writeb(BURST_LENGTH_8 | hostdata->dmode_extra,
687 host, DMODE_700_REG);
688 NCR_700_writeb(hostdata->differential ?
689 DIFF : 0, host, CTEST7_REG);
691 /* this is for 700-66, does nothing on 700 */
692 NCR_700_writeb(LAST_DIS_ENBL | ENABLE_ACTIVE_NEGATION
693 | GENERATE_RECEIVE_PARITY, host,
696 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY
697 | PARITY | AUTO_ATN, host, SCNTL0_REG);
701 NCR_700_writeb(1 << host->this_id, host, SCID_REG);
702 NCR_700_writeb(0, host, SBCL_REG);
703 NCR_700_writeb(ASYNC_OPERATION, host, SXFER_REG);
705 NCR_700_writeb(PHASE_MM_INT | SEL_TIMEOUT_INT | GROSS_ERR_INT | UX_DISC_INT
706 | RST_INT | PAR_ERR_INT | SELECT_INT, host, SIEN_REG);
708 NCR_700_writeb(ABORT_INT | INT_INST_INT | ILGL_INST_INT, host, DIEN_REG);
709 NCR_700_writeb(ENABLE_SELECT, host, SCNTL1_REG);
710 if(hostdata->clock > 75) {
711 printk(KERN_ERR "53c700: Clock speed %dMHz is too high: 75Mhz is the maximum this chip can be driven at\n", hostdata->clock);
712 /* do the best we can, but the async clock will be out
713 * of spec: sync divider 2, async divider 3 */
714 DEBUG(("53c700: sync 2 async 3\n"));
715 NCR_700_writeb(SYNC_DIV_2_0, host, SBCL_REG);
716 NCR_700_writeb(ASYNC_DIV_3_0 | dcntl_extra, host, DCNTL_REG);
717 hostdata->sync_clock = hostdata->clock/2;
718 } else if(hostdata->clock > 50 && hostdata->clock <= 75) {
719 /* sync divider 1.5, async divider 3 */
720 DEBUG(("53c700: sync 1.5 async 3\n"));
721 NCR_700_writeb(SYNC_DIV_1_5, host, SBCL_REG);
722 NCR_700_writeb(ASYNC_DIV_3_0 | dcntl_extra, host, DCNTL_REG);
723 hostdata->sync_clock = hostdata->clock*2;
724 hostdata->sync_clock /= 3;
726 } else if(hostdata->clock > 37 && hostdata->clock <= 50) {
727 /* sync divider 1, async divider 2 */
728 DEBUG(("53c700: sync 1 async 2\n"));
729 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
730 NCR_700_writeb(ASYNC_DIV_2_0 | dcntl_extra, host, DCNTL_REG);
731 hostdata->sync_clock = hostdata->clock;
732 } else if(hostdata->clock > 25 && hostdata->clock <=37) {
733 /* sync divider 1, async divider 1.5 */
734 DEBUG(("53c700: sync 1 async 1.5\n"));
735 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
736 NCR_700_writeb(ASYNC_DIV_1_5 | dcntl_extra, host, DCNTL_REG);
737 hostdata->sync_clock = hostdata->clock;
739 DEBUG(("53c700: sync 1 async 1\n"));
740 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
741 NCR_700_writeb(ASYNC_DIV_1_0 | dcntl_extra, host, DCNTL_REG);
742 /* sync divider 1, async divider 1 */
743 hostdata->sync_clock = hostdata->clock;
745 /* Calculate the actual minimum period that can be supported
746 * by our synchronous clock speed. See the 710 manual for
747 * exact details of this calculation which is based on a
748 * setting of the SXFER register */
749 min_period = 1000*(4+min_xferp)/(4*hostdata->sync_clock);
750 hostdata->min_period = NCR_700_MIN_PERIOD;
751 if(min_period > NCR_700_MIN_PERIOD)
752 hostdata->min_period = min_period;
756 NCR_700_chip_reset(struct Scsi_Host *host)
758 struct NCR_700_Host_Parameters *hostdata =
759 (struct NCR_700_Host_Parameters *)host->hostdata[0];
760 if(hostdata->chip710) {
761 NCR_700_writeb(SOFTWARE_RESET_710, host, ISTAT_REG);
764 NCR_700_writeb(0, host, ISTAT_REG);
766 NCR_700_writeb(SOFTWARE_RESET, host, DCNTL_REG);
769 NCR_700_writeb(0, host, DCNTL_REG);
774 NCR_700_chip_setup(host);
777 /* The heart of the message processing engine is that the instruction
778 * immediately after the INT is the normal case (and so must be CLEAR
779 * ACK). If we want to do something else, we call that routine in
780 * scripts and set temp to be the normal case + 8 (skipping the CLEAR
781 * ACK) so that the routine returns correctly to resume its activity
784 process_extended_message(struct Scsi_Host *host,
785 struct NCR_700_Host_Parameters *hostdata,
786 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
788 __u32 resume_offset = dsp, temp = dsp + 8;
789 __u8 pun = 0xff, lun = 0xff;
792 pun = SCp->device->id;
793 lun = SCp->device->lun;
796 switch(hostdata->msgin[2]) {
798 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
799 struct scsi_target *starget = SCp->device->sdev_target;
800 __u8 period = hostdata->msgin[3];
801 __u8 offset = hostdata->msgin[4];
803 if(offset == 0 || period == 0) {
808 spi_offset(starget) = offset;
809 spi_period(starget) = period;
811 if(NCR_700_is_flag_set(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION)) {
812 spi_display_xfer_agreement(starget);
813 NCR_700_clear_flag(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION);
816 NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
817 NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
819 NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
823 /* SDTR message out of the blue, reject it */
824 shost_printk(KERN_WARNING, host,
825 "Unexpected SDTR msg\n");
826 hostdata->msgout[0] = A_REJECT_MSG;
827 dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
828 script_patch_16(hostdata->script, MessageCount, 1);
829 /* SendMsgOut returns, so set up the return
831 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
836 printk(KERN_INFO "scsi%d: (%d:%d), Unsolicited WDTR after CMD, Rejecting\n",
837 host->host_no, pun, lun);
838 hostdata->msgout[0] = A_REJECT_MSG;
839 dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
840 script_patch_16(hostdata->script, MessageCount, 1);
841 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
846 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
847 host->host_no, pun, lun,
848 NCR_700_phase[(dsps & 0xf00) >> 8]);
849 spi_print_msg(hostdata->msgin);
852 hostdata->msgout[0] = A_REJECT_MSG;
853 dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
854 script_patch_16(hostdata->script, MessageCount, 1);
855 /* SendMsgOut returns, so set up the return
857 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
859 NCR_700_writel(temp, host, TEMP_REG);
860 return resume_offset;
864 process_message(struct Scsi_Host *host, struct NCR_700_Host_Parameters *hostdata,
865 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
867 /* work out where to return to */
868 __u32 temp = dsp + 8, resume_offset = dsp;
869 __u8 pun = 0xff, lun = 0xff;
872 pun = SCp->device->id;
873 lun = SCp->device->lun;
877 printk("scsi%d (%d:%d): message %s: ", host->host_no, pun, lun,
878 NCR_700_phase[(dsps & 0xf00) >> 8]);
879 spi_print_msg(hostdata->msgin);
883 switch(hostdata->msgin[0]) {
886 resume_offset = process_extended_message(host, hostdata, SCp,
891 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
892 /* Rejected our sync negotiation attempt */
893 spi_period(SCp->device->sdev_target) =
894 spi_offset(SCp->device->sdev_target) = 0;
895 NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
896 NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
897 } else if(SCp != NULL && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION) {
898 /* rejected our first simple tag message */
899 scmd_printk(KERN_WARNING, SCp,
900 "Rejected first tag queue attempt, turning off tag queueing\n");
901 /* we're done negotiating */
902 NCR_700_set_tag_neg_state(SCp->device, NCR_700_FINISHED_TAG_NEGOTIATION);
903 hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
904 SCp->device->tagged_supported = 0;
905 scsi_deactivate_tcq(SCp->device, host->cmd_per_lun);
907 shost_printk(KERN_WARNING, host,
908 "(%d:%d) Unexpected REJECT Message %s\n",
910 NCR_700_phase[(dsps & 0xf00) >> 8]);
911 /* however, just ignore it */
915 case A_PARITY_ERROR_MSG:
916 printk(KERN_ERR "scsi%d (%d:%d) Parity Error!\n", host->host_no,
918 NCR_700_internal_bus_reset(host);
920 case A_SIMPLE_TAG_MSG:
921 printk(KERN_INFO "scsi%d (%d:%d) SIMPLE TAG %d %s\n", host->host_no,
922 pun, lun, hostdata->msgin[1],
923 NCR_700_phase[(dsps & 0xf00) >> 8]);
927 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
928 host->host_no, pun, lun,
929 NCR_700_phase[(dsps & 0xf00) >> 8]);
931 spi_print_msg(hostdata->msgin);
934 hostdata->msgout[0] = A_REJECT_MSG;
935 dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
936 script_patch_16(hostdata->script, MessageCount, 1);
937 /* SendMsgOut returns, so set up the return
939 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
943 NCR_700_writel(temp, host, TEMP_REG);
944 /* set us up to receive another message */
945 dma_cache_sync(hostdata->msgin, MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
946 return resume_offset;
950 process_script_interrupt(__u32 dsps, __u32 dsp, struct scsi_cmnd *SCp,
951 struct Scsi_Host *host,
952 struct NCR_700_Host_Parameters *hostdata)
954 __u32 resume_offset = 0;
955 __u8 pun = 0xff, lun=0xff;
958 pun = SCp->device->id;
959 lun = SCp->device->lun;
962 if(dsps == A_GOOD_STATUS_AFTER_STATUS) {
963 DEBUG((" COMMAND COMPLETE, status=%02x\n",
964 hostdata->status[0]));
965 /* OK, if TCQ still under negotiation, we now know it works */
966 if (NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION)
967 NCR_700_set_tag_neg_state(SCp->device,
968 NCR_700_FINISHED_TAG_NEGOTIATION);
970 /* check for contingent allegiance contitions */
971 if(status_byte(hostdata->status[0]) == CHECK_CONDITION ||
972 status_byte(hostdata->status[0]) == COMMAND_TERMINATED) {
973 struct NCR_700_command_slot *slot =
974 (struct NCR_700_command_slot *)SCp->host_scribble;
975 if(SCp->cmnd[0] == REQUEST_SENSE) {
976 /* OOPS: bad device, returning another
977 * contingent allegiance condition */
978 scmd_printk(KERN_ERR, SCp,
979 "broken device is looping in contingent allegiance: ignoring\n");
980 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
983 scsi_print_command(SCp);
984 printk(" cmd %p has status %d, requesting sense\n",
985 SCp, hostdata->status[0]);
987 /* we can destroy the command here
988 * because the contingent allegiance
989 * condition will cause a retry which
990 * will re-copy the command from the
991 * saved data_cmnd. We also unmap any
992 * data associated with the command
994 NCR_700_unmap(hostdata, SCp, slot);
996 SCp->cmnd[0] = REQUEST_SENSE;
997 SCp->cmnd[1] = (SCp->device->lun & 0x7) << 5;
1000 SCp->cmnd[4] = sizeof(SCp->sense_buffer);
1003 /* Here's a quiet hack: the
1004 * REQUEST_SENSE command is six bytes,
1005 * so store a flag indicating that
1006 * this was an internal sense request
1007 * and the original status at the end
1009 SCp->cmnd[6] = NCR_700_INTERNAL_SENSE_MAGIC;
1010 SCp->cmnd[7] = hostdata->status[0];
1012 SCp->sc_data_direction = DMA_FROM_DEVICE;
1013 dma_sync_single_for_device(hostdata->dev, slot->pCmd,
1014 SCp->cmd_len, DMA_TO_DEVICE);
1015 SCp->request_bufflen = sizeof(SCp->sense_buffer);
1016 slot->dma_handle = dma_map_single(hostdata->dev, SCp->sense_buffer, sizeof(SCp->sense_buffer), DMA_FROM_DEVICE);
1017 slot->SG[0].ins = bS_to_host(SCRIPT_MOVE_DATA_IN | sizeof(SCp->sense_buffer));
1018 slot->SG[0].pAddr = bS_to_host(slot->dma_handle);
1019 slot->SG[1].ins = bS_to_host(SCRIPT_RETURN);
1020 slot->SG[1].pAddr = 0;
1021 slot->resume_offset = hostdata->pScript;
1022 dma_cache_sync(slot->SG, sizeof(slot->SG[0])*2, DMA_TO_DEVICE);
1023 dma_cache_sync(SCp->sense_buffer, sizeof(SCp->sense_buffer), DMA_FROM_DEVICE);
1025 /* queue the command for reissue */
1026 slot->state = NCR_700_SLOT_QUEUED;
1027 hostdata->state = NCR_700_HOST_FREE;
1028 hostdata->cmd = NULL;
1031 // Currently rely on the mid layer evaluation
1032 // of the tag queuing capability
1034 //if(status_byte(hostdata->status[0]) == GOOD &&
1035 // SCp->cmnd[0] == INQUIRY && SCp->use_sg == 0) {
1036 // /* Piggy back the tag queueing support
1037 // * on this command */
1038 // dma_sync_single_for_cpu(hostdata->dev,
1039 // slot->dma_handle,
1040 // SCp->request_bufflen,
1041 // DMA_FROM_DEVICE);
1042 // if(((char *)SCp->request_buffer)[7] & 0x02) {
1043 // scmd_printk(KERN_INFO, SCp,
1044 // "Enabling Tag Command Queuing\n");
1045 // hostdata->tag_negotiated |= (1<<scmd_id(SCp));
1046 // NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1048 // NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1049 // hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
1052 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
1054 } else if((dsps & 0xfffff0f0) == A_UNEXPECTED_PHASE) {
1055 __u8 i = (dsps & 0xf00) >> 8;
1057 scmd_printk(KERN_ERR, SCp, "UNEXPECTED PHASE %s (%s)\n",
1059 sbcl_to_string(NCR_700_readb(host, SBCL_REG)));
1060 scmd_printk(KERN_ERR, SCp, " len = %d, cmd =",
1062 scsi_print_command(SCp);
1064 NCR_700_internal_bus_reset(host);
1065 } else if((dsps & 0xfffff000) == A_FATAL) {
1066 int i = (dsps & 0xfff);
1068 printk(KERN_ERR "scsi%d: (%d:%d) FATAL ERROR: %s\n",
1069 host->host_no, pun, lun, NCR_700_fatal_messages[i]);
1070 if(dsps == A_FATAL_ILLEGAL_MSG_LENGTH) {
1071 printk(KERN_ERR " msg begins %02x %02x\n",
1072 hostdata->msgin[0], hostdata->msgin[1]);
1074 NCR_700_internal_bus_reset(host);
1075 } else if((dsps & 0xfffff0f0) == A_DISCONNECT) {
1076 #ifdef NCR_700_DEBUG
1077 __u8 i = (dsps & 0xf00) >> 8;
1079 printk("scsi%d: (%d:%d), DISCONNECTED (%d) %s\n",
1080 host->host_no, pun, lun,
1081 i, NCR_700_phase[i]);
1083 save_for_reselection(hostdata, SCp, dsp);
1085 } else if(dsps == A_RESELECTION_IDENTIFIED) {
1087 struct NCR_700_command_slot *slot;
1088 __u8 reselection_id = hostdata->reselection_id;
1089 struct scsi_device *SDp;
1091 lun = hostdata->msgin[0] & 0x1f;
1093 hostdata->reselection_id = 0xff;
1094 DEBUG(("scsi%d: (%d:%d) RESELECTED!\n",
1095 host->host_no, reselection_id, lun));
1096 /* clear the reselection indicator */
1097 SDp = __scsi_device_lookup(host, 0, reselection_id, lun);
1098 if(unlikely(SDp == NULL)) {
1099 printk(KERN_ERR "scsi%d: (%d:%d) HAS NO device\n",
1100 host->host_no, reselection_id, lun);
1103 if(hostdata->msgin[1] == A_SIMPLE_TAG_MSG) {
1104 struct scsi_cmnd *SCp = scsi_find_tag(SDp, hostdata->msgin[2]);
1105 if(unlikely(SCp == NULL)) {
1106 printk(KERN_ERR "scsi%d: (%d:%d) no saved request for tag %d\n",
1107 host->host_no, reselection_id, lun, hostdata->msgin[2]);
1111 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1112 DDEBUG(KERN_DEBUG, SDp,
1113 "reselection is tag %d, slot %p(%d)\n",
1114 hostdata->msgin[2], slot, slot->tag);
1116 struct scsi_cmnd *SCp = scsi_find_tag(SDp, SCSI_NO_TAG);
1117 if(unlikely(SCp == NULL)) {
1118 sdev_printk(KERN_ERR, SDp,
1119 "no saved request for untagged cmd\n");
1122 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1126 printk(KERN_ERR "scsi%d: (%d:%d) RESELECTED but no saved command (MSG = %02x %02x %02x)!!\n",
1127 host->host_no, reselection_id, lun,
1128 hostdata->msgin[0], hostdata->msgin[1],
1129 hostdata->msgin[2]);
1131 if(hostdata->state != NCR_700_HOST_BUSY)
1132 printk(KERN_ERR "scsi%d: FATAL, host not busy during valid reselection!\n",
1134 resume_offset = slot->resume_offset;
1135 hostdata->cmd = slot->cmnd;
1137 /* re-patch for this command */
1138 script_patch_32_abs(hostdata->script, CommandAddress,
1140 script_patch_16(hostdata->script,
1141 CommandCount, slot->cmnd->cmd_len);
1142 script_patch_32_abs(hostdata->script, SGScriptStartAddress,
1143 to32bit(&slot->pSG[0].ins));
1145 /* Note: setting SXFER only works if we're
1146 * still in the MESSAGE phase, so it is vital
1147 * that ACK is still asserted when we process
1148 * the reselection message. The resume offset
1149 * should therefore always clear ACK */
1150 NCR_700_writeb(NCR_700_get_SXFER(hostdata->cmd->device),
1152 dma_cache_sync(hostdata->msgin,
1153 MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
1154 dma_cache_sync(hostdata->msgout,
1155 MSG_ARRAY_SIZE, DMA_TO_DEVICE);
1156 /* I'm just being paranoid here, the command should
1157 * already have been flushed from the cache */
1158 dma_cache_sync(slot->cmnd->cmnd,
1159 slot->cmnd->cmd_len, DMA_TO_DEVICE);
1164 } else if(dsps == A_RESELECTED_DURING_SELECTION) {
1166 /* This section is full of debugging code because I've
1167 * never managed to reach it. I think what happens is
1168 * that, because the 700 runs with selection
1169 * interrupts enabled the whole time that we take a
1170 * selection interrupt before we manage to get to the
1171 * reselected script interrupt */
1173 __u8 reselection_id = NCR_700_readb(host, SFBR_REG);
1174 struct NCR_700_command_slot *slot;
1176 /* Take out our own ID */
1177 reselection_id &= ~(1<<host->this_id);
1179 /* I've never seen this happen, so keep this as a printk rather
1181 printk(KERN_INFO "scsi%d: (%d:%d) RESELECTION DURING SELECTION, dsp=%08x[%04x] state=%d, count=%d\n",
1182 host->host_no, reselection_id, lun, dsp, dsp - hostdata->pScript, hostdata->state, hostdata->command_slot_count);
1185 /* FIXME: DEBUGGING CODE */
1186 __u32 SG = (__u32)bS_to_cpu(hostdata->script[A_SGScriptStartAddress_used[0]]);
1189 for(i=0; i< NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1190 if(SG >= to32bit(&hostdata->slots[i].pSG[0])
1191 && SG <= to32bit(&hostdata->slots[i].pSG[NCR_700_SG_SEGMENTS]))
1194 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);
1195 SCp = hostdata->slots[i].cmnd;
1199 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1200 /* change slot from busy to queued to redo command */
1201 slot->state = NCR_700_SLOT_QUEUED;
1203 hostdata->cmd = NULL;
1205 if(reselection_id == 0) {
1206 if(hostdata->reselection_id == 0xff) {
1207 printk(KERN_ERR "scsi%d: Invalid reselection during selection!!\n", host->host_no);
1210 printk(KERN_ERR "scsi%d: script reselected and we took a selection interrupt\n",
1212 reselection_id = hostdata->reselection_id;
1216 /* convert to real ID */
1217 reselection_id = bitmap_to_number(reselection_id);
1219 hostdata->reselection_id = reselection_id;
1220 /* just in case we have a stale simple tag message, clear it */
1221 hostdata->msgin[1] = 0;
1222 dma_cache_sync(hostdata->msgin,
1223 MSG_ARRAY_SIZE, DMA_BIDIRECTIONAL);
1224 if(hostdata->tag_negotiated & (1<<reselection_id)) {
1225 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1227 resume_offset = hostdata->pScript + Ent_GetReselectionData;
1229 } else if(dsps == A_COMPLETED_SELECTION_AS_TARGET) {
1230 /* we've just disconnected from the bus, do nothing since
1231 * a return here will re-run the queued command slot
1232 * that may have been interrupted by the initial selection */
1233 DEBUG((" SELECTION COMPLETED\n"));
1234 } else if((dsps & 0xfffff0f0) == A_MSG_IN) {
1235 resume_offset = process_message(host, hostdata, SCp,
1237 } else if((dsps & 0xfffff000) == 0) {
1238 __u8 i = (dsps & 0xf0) >> 4, j = (dsps & 0xf00) >> 8;
1239 printk(KERN_ERR "scsi%d: (%d:%d), unhandled script condition %s %s at %04x\n",
1240 host->host_no, pun, lun, NCR_700_condition[i],
1241 NCR_700_phase[j], dsp - hostdata->pScript);
1243 scsi_print_command(SCp);
1246 for(i = 0; i < SCp->use_sg + 1; i++) {
1247 printk(KERN_INFO " SG[%d].length = %d, move_insn=%08x, addr %08x\n", i, ((struct scatterlist *)SCp->buffer)[i].length, ((struct NCR_700_command_slot *)SCp->host_scribble)->SG[i].ins, ((struct NCR_700_command_slot *)SCp->host_scribble)->SG[i].pAddr);
1251 NCR_700_internal_bus_reset(host);
1252 } else if((dsps & 0xfffff000) == A_DEBUG_INTERRUPT) {
1253 printk(KERN_NOTICE "scsi%d (%d:%d) DEBUG INTERRUPT %d AT %08x[%04x], continuing\n",
1254 host->host_no, pun, lun, dsps & 0xfff, dsp, dsp - hostdata->pScript);
1255 resume_offset = dsp;
1257 printk(KERN_ERR "scsi%d: (%d:%d), unidentified script interrupt 0x%x at %04x\n",
1258 host->host_no, pun, lun, dsps, dsp - hostdata->pScript);
1259 NCR_700_internal_bus_reset(host);
1261 return resume_offset;
1264 /* We run the 53c700 with selection interrupts always enabled. This
1265 * means that the chip may be selected as soon as the bus frees. On a
1266 * busy bus, this can be before the scripts engine finishes its
1267 * processing. Therefore, part of the selection processing has to be
1268 * to find out what the scripts engine is doing and complete the
1269 * function if necessary (i.e. process the pending disconnect or save
1270 * the interrupted initial selection */
1272 process_selection(struct Scsi_Host *host, __u32 dsp)
1274 __u8 id = 0; /* Squash compiler warning */
1276 __u32 resume_offset = 0;
1277 struct NCR_700_Host_Parameters *hostdata =
1278 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1279 struct scsi_cmnd *SCp = hostdata->cmd;
1282 for(count = 0; count < 5; count++) {
1283 id = NCR_700_readb(host, hostdata->chip710 ?
1284 CTEST9_REG : SFBR_REG);
1286 /* Take out our own ID */
1287 id &= ~(1<<host->this_id);
1292 sbcl = NCR_700_readb(host, SBCL_REG);
1293 if((sbcl & SBCL_IO) == 0) {
1294 /* mark as having been selected rather than reselected */
1297 /* convert to real ID */
1298 hostdata->reselection_id = id = bitmap_to_number(id);
1299 DEBUG(("scsi%d: Reselected by %d\n",
1300 host->host_no, id));
1302 if(hostdata->state == NCR_700_HOST_BUSY && SCp != NULL) {
1303 struct NCR_700_command_slot *slot =
1304 (struct NCR_700_command_slot *)SCp->host_scribble;
1305 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));
1307 switch(dsp - hostdata->pScript) {
1308 case Ent_Disconnect1:
1309 case Ent_Disconnect2:
1310 save_for_reselection(hostdata, SCp, Ent_Disconnect2 + hostdata->pScript);
1312 case Ent_Disconnect3:
1313 case Ent_Disconnect4:
1314 save_for_reselection(hostdata, SCp, Ent_Disconnect4 + hostdata->pScript);
1316 case Ent_Disconnect5:
1317 case Ent_Disconnect6:
1318 save_for_reselection(hostdata, SCp, Ent_Disconnect6 + hostdata->pScript);
1320 case Ent_Disconnect7:
1321 case Ent_Disconnect8:
1322 save_for_reselection(hostdata, SCp, Ent_Disconnect8 + hostdata->pScript);
1326 process_script_interrupt(A_GOOD_STATUS_AFTER_STATUS, dsp, SCp, host, hostdata);
1330 slot->state = NCR_700_SLOT_QUEUED;
1334 hostdata->state = NCR_700_HOST_BUSY;
1335 hostdata->cmd = NULL;
1336 /* clear any stale simple tag message */
1337 hostdata->msgin[1] = 0;
1338 dma_cache_sync(hostdata->msgin, MSG_ARRAY_SIZE,
1342 /* Selected as target, Ignore */
1343 resume_offset = hostdata->pScript + Ent_SelectedAsTarget;
1344 } else if(hostdata->tag_negotiated & (1<<id)) {
1345 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1347 resume_offset = hostdata->pScript + Ent_GetReselectionData;
1349 return resume_offset;
1353 NCR_700_clear_fifo(struct Scsi_Host *host) {
1354 const struct NCR_700_Host_Parameters *hostdata
1355 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1356 if(hostdata->chip710) {
1357 NCR_700_writeb(CLR_FIFO_710, host, CTEST8_REG);
1359 NCR_700_writeb(CLR_FIFO, host, DFIFO_REG);
1364 NCR_700_flush_fifo(struct Scsi_Host *host) {
1365 const struct NCR_700_Host_Parameters *hostdata
1366 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1367 if(hostdata->chip710) {
1368 NCR_700_writeb(FLUSH_DMA_FIFO_710, host, CTEST8_REG);
1370 NCR_700_writeb(0, host, CTEST8_REG);
1372 NCR_700_writeb(FLUSH_DMA_FIFO, host, DFIFO_REG);
1374 NCR_700_writeb(0, host, DFIFO_REG);
1379 /* The queue lock with interrupts disabled must be held on entry to
1382 NCR_700_start_command(struct scsi_cmnd *SCp)
1384 struct NCR_700_command_slot *slot =
1385 (struct NCR_700_command_slot *)SCp->host_scribble;
1386 struct NCR_700_Host_Parameters *hostdata =
1387 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1388 __u16 count = 1; /* for IDENTIFY message */
1390 if(hostdata->state != NCR_700_HOST_FREE) {
1391 /* keep this inside the lock to close the race window where
1392 * the running command finishes on another CPU while we don't
1393 * change the state to queued on this one */
1394 slot->state = NCR_700_SLOT_QUEUED;
1396 DEBUG(("scsi%d: host busy, queueing command %p, slot %p\n",
1397 SCp->device->host->host_no, slot->cmnd, slot));
1400 hostdata->state = NCR_700_HOST_BUSY;
1401 hostdata->cmd = SCp;
1402 slot->state = NCR_700_SLOT_BUSY;
1403 /* keep interrupts disabled until we have the command correctly
1404 * set up so we cannot take a selection interrupt */
1406 hostdata->msgout[0] = NCR_700_identify(SCp->cmnd[0] != REQUEST_SENSE,
1408 /* for INQUIRY or REQUEST_SENSE commands, we cannot be sure
1409 * if the negotiated transfer parameters still hold, so
1410 * always renegotiate them */
1411 if(SCp->cmnd[0] == INQUIRY || SCp->cmnd[0] == REQUEST_SENSE) {
1412 NCR_700_clear_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
1415 /* REQUEST_SENSE is asking for contingent I_T_L(_Q) status.
1416 * If a contingent allegiance condition exists, the device
1417 * will refuse all tags, so send the request sense as untagged
1419 if((hostdata->tag_negotiated & (1<<scmd_id(SCp)))
1420 && (slot->tag != SCSI_NO_TAG && SCp->cmnd[0] != REQUEST_SENSE)) {
1421 count += scsi_populate_tag_msg(SCp, &hostdata->msgout[count]);
1424 if(hostdata->fast &&
1425 NCR_700_is_flag_clear(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC)) {
1426 count += spi_populate_sync_msg(&hostdata->msgout[count],
1427 spi_period(SCp->device->sdev_target),
1428 spi_offset(SCp->device->sdev_target));
1429 NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
1432 script_patch_16(hostdata->script, MessageCount, count);
1435 script_patch_ID(hostdata->script,
1436 Device_ID, 1<<scmd_id(SCp));
1438 script_patch_32_abs(hostdata->script, CommandAddress,
1440 script_patch_16(hostdata->script, CommandCount, SCp->cmd_len);
1441 /* finally plumb the beginning of the SG list into the script
1443 script_patch_32_abs(hostdata->script, SGScriptStartAddress,
1444 to32bit(&slot->pSG[0].ins));
1445 NCR_700_clear_fifo(SCp->device->host);
1447 if(slot->resume_offset == 0)
1448 slot->resume_offset = hostdata->pScript;
1449 /* now perform all the writebacks and invalidates */
1450 dma_cache_sync(hostdata->msgout, count, DMA_TO_DEVICE);
1451 dma_cache_sync(hostdata->msgin, MSG_ARRAY_SIZE,
1453 dma_cache_sync(SCp->cmnd, SCp->cmd_len, DMA_TO_DEVICE);
1454 dma_cache_sync(hostdata->status, 1, DMA_FROM_DEVICE);
1456 /* set the synchronous period/offset */
1457 NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
1458 SCp->device->host, SXFER_REG);
1459 NCR_700_writel(slot->temp, SCp->device->host, TEMP_REG);
1460 NCR_700_writel(slot->resume_offset, SCp->device->host, DSP_REG);
1466 NCR_700_intr(int irq, void *dev_id, struct pt_regs *regs)
1468 struct Scsi_Host *host = (struct Scsi_Host *)dev_id;
1469 struct NCR_700_Host_Parameters *hostdata =
1470 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1472 __u32 resume_offset = 0;
1473 __u8 pun = 0xff, lun = 0xff;
1474 unsigned long flags;
1477 /* Use the host lock to serialise acess to the 53c700
1478 * hardware. Note: In future, we may need to take the queue
1479 * lock to enter the done routines. When that happens, we
1480 * need to ensure that for this driver, the host lock and the
1481 * queue lock point to the same thing. */
1482 spin_lock_irqsave(host->host_lock, flags);
1483 if((istat = NCR_700_readb(host, ISTAT_REG))
1484 & (SCSI_INT_PENDING | DMA_INT_PENDING)) {
1486 __u8 sstat0 = 0, dstat = 0;
1488 struct scsi_cmnd *SCp = hostdata->cmd;
1489 enum NCR_700_Host_State state;
1492 state = hostdata->state;
1493 SCp = hostdata->cmd;
1495 if(istat & SCSI_INT_PENDING) {
1498 sstat0 = NCR_700_readb(host, SSTAT0_REG);
1501 if(istat & DMA_INT_PENDING) {
1504 dstat = NCR_700_readb(host, DSTAT_REG);
1507 dsps = NCR_700_readl(host, DSPS_REG);
1508 dsp = NCR_700_readl(host, DSP_REG);
1510 DEBUG(("scsi%d: istat %02x sstat0 %02x dstat %02x dsp %04x[%08x] dsps 0x%x\n",
1511 host->host_no, istat, sstat0, dstat,
1512 (dsp - (__u32)(hostdata->pScript))/4,
1516 pun = SCp->device->id;
1517 lun = SCp->device->lun;
1520 if(sstat0 & SCSI_RESET_DETECTED) {
1521 struct scsi_device *SDp;
1524 hostdata->state = NCR_700_HOST_BUSY;
1526 printk(KERN_ERR "scsi%d: Bus Reset detected, executing command %p, slot %p, dsp %08x[%04x]\n",
1527 host->host_no, SCp, SCp == NULL ? NULL : SCp->host_scribble, dsp, dsp - hostdata->pScript);
1529 scsi_report_bus_reset(host, 0);
1531 /* clear all the negotiated parameters */
1532 __shost_for_each_device(SDp, host)
1533 SDp->hostdata = NULL;
1535 /* clear all the slots and their pending commands */
1536 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1537 struct scsi_cmnd *SCp;
1538 struct NCR_700_command_slot *slot =
1539 &hostdata->slots[i];
1541 if(slot->state == NCR_700_SLOT_FREE)
1545 printk(KERN_ERR " failing command because of reset, slot %p, cmnd %p\n",
1547 free_slot(slot, hostdata);
1548 SCp->host_scribble = NULL;
1549 NCR_700_set_depth(SCp->device, 0);
1550 /* NOTE: deadlock potential here: we
1551 * rely on mid-layer guarantees that
1552 * scsi_done won't try to issue the
1553 * command again otherwise we'll
1555 * hostdata->state_lock */
1556 SCp->result = DID_RESET << 16;
1557 SCp->scsi_done(SCp);
1560 NCR_700_chip_setup(host);
1562 hostdata->state = NCR_700_HOST_FREE;
1563 hostdata->cmd = NULL;
1564 /* signal back if this was an eh induced reset */
1565 if(hostdata->eh_complete != NULL)
1566 complete(hostdata->eh_complete);
1568 } else if(sstat0 & SELECTION_TIMEOUT) {
1569 DEBUG(("scsi%d: (%d:%d) selection timeout\n",
1570 host->host_no, pun, lun));
1571 NCR_700_scsi_done(hostdata, SCp, DID_NO_CONNECT<<16);
1572 } else if(sstat0 & PHASE_MISMATCH) {
1573 struct NCR_700_command_slot *slot = (SCp == NULL) ? NULL :
1574 (struct NCR_700_command_slot *)SCp->host_scribble;
1576 if(dsp == Ent_SendMessage + 8 + hostdata->pScript) {
1577 /* It wants to reply to some part of
1579 #ifdef NCR_700_DEBUG
1580 __u32 temp = NCR_700_readl(host, TEMP_REG);
1581 int count = (hostdata->script[Ent_SendMessage/4] & 0xffffff) - ((NCR_700_readl(host, DBC_REG) & 0xffffff) + NCR_700_data_residual(host));
1582 printk("scsi%d (%d:%d) PHASE MISMATCH IN SEND MESSAGE %d remain, return %p[%04x], phase %s\n", host->host_no, pun, lun, count, (void *)temp, temp - hostdata->pScript, sbcl_to_string(NCR_700_readb(host, SBCL_REG)));
1584 resume_offset = hostdata->pScript + Ent_SendMessagePhaseMismatch;
1585 } else if(dsp >= to32bit(&slot->pSG[0].ins) &&
1586 dsp <= to32bit(&slot->pSG[NCR_700_SG_SEGMENTS].ins)) {
1587 int data_transfer = NCR_700_readl(host, DBC_REG) & 0xffffff;
1588 int SGcount = (dsp - to32bit(&slot->pSG[0].ins))/sizeof(struct NCR_700_SG_List);
1589 int residual = NCR_700_data_residual(host);
1591 #ifdef NCR_700_DEBUG
1592 __u32 naddr = NCR_700_readl(host, DNAD_REG);
1594 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x\n",
1595 host->host_no, pun, lun,
1596 SGcount, data_transfer);
1597 scsi_print_command(SCp);
1599 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x, residual %d\n",
1600 host->host_no, pun, lun,
1601 SGcount, data_transfer, residual);
1604 data_transfer += residual;
1606 if(data_transfer != 0) {
1612 count = (bS_to_cpu(slot->SG[SGcount].ins) & 0x00ffffff);
1613 DEBUG(("DATA TRANSFER MISMATCH, count = %d, transferred %d\n", count, count-data_transfer));
1614 slot->SG[SGcount].ins &= bS_to_host(0xff000000);
1615 slot->SG[SGcount].ins |= bS_to_host(data_transfer);
1616 pAddr = bS_to_cpu(slot->SG[SGcount].pAddr);
1617 pAddr += (count - data_transfer);
1618 #ifdef NCR_700_DEBUG
1619 if(pAddr != naddr) {
1620 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);
1623 slot->SG[SGcount].pAddr = bS_to_host(pAddr);
1625 /* set the executed moves to nops */
1626 for(i=0; i<SGcount; i++) {
1627 slot->SG[i].ins = bS_to_host(SCRIPT_NOP);
1628 slot->SG[i].pAddr = 0;
1630 dma_cache_sync(slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1631 /* and pretend we disconnected after
1632 * the command phase */
1633 resume_offset = hostdata->pScript + Ent_MsgInDuringData;
1634 /* make sure all the data is flushed */
1635 NCR_700_flush_fifo(host);
1637 __u8 sbcl = NCR_700_readb(host, SBCL_REG);
1638 printk(KERN_ERR "scsi%d: (%d:%d) phase mismatch at %04x, phase %s\n",
1639 host->host_no, pun, lun, dsp - hostdata->pScript, sbcl_to_string(sbcl));
1640 NCR_700_internal_bus_reset(host);
1643 } else if(sstat0 & SCSI_GROSS_ERROR) {
1644 printk(KERN_ERR "scsi%d: (%d:%d) GROSS ERROR\n",
1645 host->host_no, pun, lun);
1646 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1647 } else if(sstat0 & PARITY_ERROR) {
1648 printk(KERN_ERR "scsi%d: (%d:%d) PARITY ERROR\n",
1649 host->host_no, pun, lun);
1650 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1651 } else if(dstat & SCRIPT_INT_RECEIVED) {
1652 DEBUG(("scsi%d: (%d:%d) ====>SCRIPT INTERRUPT<====\n",
1653 host->host_no, pun, lun));
1654 resume_offset = process_script_interrupt(dsps, dsp, SCp, host, hostdata);
1655 } else if(dstat & (ILGL_INST_DETECTED)) {
1656 printk(KERN_ERR "scsi%d: (%d:%d) Illegal Instruction detected at 0x%08x[0x%x]!!!\n"
1657 " Please email James.Bottomley@HansenPartnership.com with the details\n",
1658 host->host_no, pun, lun,
1659 dsp, dsp - hostdata->pScript);
1660 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1661 } else if(dstat & (WATCH_DOG_INTERRUPT|ABORTED)) {
1662 printk(KERN_ERR "scsi%d: (%d:%d) serious DMA problem, dstat=%02x\n",
1663 host->host_no, pun, lun, dstat);
1664 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1668 /* NOTE: selection interrupt processing MUST occur
1669 * after script interrupt processing to correctly cope
1670 * with the case where we process a disconnect and
1671 * then get reselected before we process the
1673 if(sstat0 & SELECTED) {
1674 /* FIXME: It currently takes at least FOUR
1675 * interrupts to complete a command that
1676 * disconnects: one for the disconnect, one
1677 * for the reselection, one to get the
1678 * reselection data and one to complete the
1679 * command. If we guess the reselected
1680 * command here and prepare it, we only need
1681 * to get a reselection data interrupt if we
1682 * guessed wrongly. Since the interrupt
1683 * overhead is much greater than the command
1684 * setup, this would be an efficient
1685 * optimisation particularly as we probably
1686 * only have one outstanding command on a
1687 * target most of the time */
1689 resume_offset = process_selection(host, dsp);
1696 if(hostdata->state != NCR_700_HOST_BUSY) {
1697 printk(KERN_ERR "scsi%d: Driver error: resume at 0x%08x [0x%04x] with non busy host!\n",
1698 host->host_no, resume_offset, resume_offset - hostdata->pScript);
1699 hostdata->state = NCR_700_HOST_BUSY;
1702 DEBUG(("Attempting to resume at %x\n", resume_offset));
1703 NCR_700_clear_fifo(host);
1704 NCR_700_writel(resume_offset, host, DSP_REG);
1706 /* There is probably a technical no-no about this: If we're a
1707 * shared interrupt and we got this interrupt because the
1708 * other device needs servicing not us, we're still going to
1709 * check our queued commands here---of course, there shouldn't
1710 * be any outstanding.... */
1711 if(hostdata->state == NCR_700_HOST_FREE) {
1714 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1715 /* fairness: always run the queue from the last
1716 * position we left off */
1717 int j = (i + hostdata->saved_slot_position)
1718 % NCR_700_COMMAND_SLOTS_PER_HOST;
1720 if(hostdata->slots[j].state != NCR_700_SLOT_QUEUED)
1722 if(NCR_700_start_command(hostdata->slots[j].cmnd)) {
1723 DEBUG(("scsi%d: Issuing saved command slot %p, cmd %p\t\n",
1724 host->host_no, &hostdata->slots[j],
1725 hostdata->slots[j].cmnd));
1726 hostdata->saved_slot_position = j + 1;
1733 spin_unlock_irqrestore(host->host_lock, flags);
1734 return IRQ_RETVAL(handled);
1738 NCR_700_queuecommand(struct scsi_cmnd *SCp, void (*done)(struct scsi_cmnd *))
1740 struct NCR_700_Host_Parameters *hostdata =
1741 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1743 enum dma_data_direction direction;
1744 struct NCR_700_command_slot *slot;
1746 if(hostdata->command_slot_count >= NCR_700_COMMAND_SLOTS_PER_HOST) {
1747 /* We're over our allocation, this should never happen
1748 * since we report the max allocation to the mid layer */
1749 printk(KERN_WARNING "scsi%d: Command depth has gone over queue depth\n", SCp->device->host->host_no);
1752 /* check for untagged commands. We cannot have any outstanding
1753 * commands if we accept them. Commands could be untagged because:
1755 * - The tag negotiated bitmap is clear
1756 * - The blk layer sent and untagged command
1758 if(NCR_700_get_depth(SCp->device) != 0
1759 && (!(hostdata->tag_negotiated & (1<<scmd_id(SCp)))
1760 || !blk_rq_tagged(SCp->request))) {
1761 CDEBUG(KERN_ERR, SCp, "has non zero depth %d\n",
1762 NCR_700_get_depth(SCp->device));
1763 return SCSI_MLQUEUE_DEVICE_BUSY;
1765 if(NCR_700_get_depth(SCp->device) >= SCp->device->queue_depth) {
1766 CDEBUG(KERN_ERR, SCp, "has max tag depth %d\n",
1767 NCR_700_get_depth(SCp->device));
1768 return SCSI_MLQUEUE_DEVICE_BUSY;
1770 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) + 1);
1772 /* begin the command here */
1773 /* no need to check for NULL, test for command_slot_count above
1774 * ensures a slot is free */
1775 slot = find_empty_slot(hostdata);
1779 SCp->scsi_done = done;
1780 SCp->host_scribble = (unsigned char *)slot;
1781 SCp->SCp.ptr = NULL;
1782 SCp->SCp.buffer = NULL;
1784 #ifdef NCR_700_DEBUG
1785 printk("53c700: scsi%d, command ", SCp->device->host->host_no);
1786 scsi_print_command(SCp);
1788 if(blk_rq_tagged(SCp->request)
1789 && (hostdata->tag_negotiated &(1<<scmd_id(SCp))) == 0
1790 && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_START_TAG_NEGOTIATION) {
1791 scmd_printk(KERN_ERR, SCp, "Enabling Tag Command Queuing\n");
1792 hostdata->tag_negotiated |= (1<<scmd_id(SCp));
1793 NCR_700_set_tag_neg_state(SCp->device, NCR_700_DURING_TAG_NEGOTIATION);
1796 /* here we may have to process an untagged command. The gate
1797 * above ensures that this will be the only one outstanding,
1798 * so clear the tag negotiated bit.
1800 * FIXME: This will royally screw up on multiple LUN devices
1802 if(!blk_rq_tagged(SCp->request)
1803 && (hostdata->tag_negotiated &(1<<scmd_id(SCp)))) {
1804 scmd_printk(KERN_INFO, SCp, "Disabling Tag Command Queuing\n");
1805 hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
1808 if((hostdata->tag_negotiated &(1<<scmd_id(SCp)))
1809 && scsi_get_tag_type(SCp->device)) {
1810 slot->tag = SCp->request->tag;
1811 CDEBUG(KERN_DEBUG, SCp, "sending out tag %d, slot %p\n",
1814 slot->tag = SCSI_NO_TAG;
1815 /* must populate current_cmnd for scsi_find_tag to work */
1816 SCp->device->current_cmnd = SCp;
1818 /* sanity check: some of the commands generated by the mid-layer
1819 * have an eccentric idea of their sc_data_direction */
1820 if(!SCp->use_sg && !SCp->request_bufflen
1821 && SCp->sc_data_direction != DMA_NONE) {
1822 #ifdef NCR_700_DEBUG
1823 printk("53c700: Command");
1824 scsi_print_command(SCp);
1825 printk("Has wrong data direction %d\n", SCp->sc_data_direction);
1827 SCp->sc_data_direction = DMA_NONE;
1830 switch (SCp->cmnd[0]) {
1832 /* clear the internal sense magic */
1836 /* OK, get it from the command */
1837 switch(SCp->sc_data_direction) {
1838 case DMA_BIDIRECTIONAL:
1840 printk(KERN_ERR "53c700: Unknown command for data direction ");
1841 scsi_print_command(SCp);
1848 case DMA_FROM_DEVICE:
1849 move_ins = SCRIPT_MOVE_DATA_IN;
1852 move_ins = SCRIPT_MOVE_DATA_OUT;
1857 /* now build the scatter gather list */
1858 direction = SCp->sc_data_direction;
1862 dma_addr_t vPtr = 0;
1866 sg_count = dma_map_sg(hostdata->dev, SCp->buffer,
1867 SCp->use_sg, direction);
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->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;
2040 NCR_700_slave_configure(struct scsi_device *SDp)
2042 struct NCR_700_Host_Parameters *hostdata =
2043 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2045 /* to do here: allocate memory; build a queue_full list */
2046 if(SDp->tagged_supported) {
2047 scsi_set_tag_type(SDp, MSG_ORDERED_TAG);
2048 scsi_activate_tcq(SDp, NCR_700_DEFAULT_TAGS);
2049 NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2051 /* initialise to default depth */
2052 scsi_adjust_queue_depth(SDp, 0, SDp->host->cmd_per_lun);
2054 if(hostdata->fast) {
2055 /* Find the correct offset and period via domain validation */
2056 if (!spi_initial_dv(SDp->sdev_target))
2059 spi_offset(SDp->sdev_target) = 0;
2060 spi_period(SDp->sdev_target) = 0;
2066 NCR_700_slave_destroy(struct scsi_device *SDp)
2068 /* to do here: deallocate memory */
2072 NCR_700_change_queue_depth(struct scsi_device *SDp, int depth)
2074 if (depth > NCR_700_MAX_TAGS)
2075 depth = NCR_700_MAX_TAGS;
2077 scsi_adjust_queue_depth(SDp, scsi_get_tag_type(SDp), depth);
2081 static int NCR_700_change_queue_type(struct scsi_device *SDp, int tag_type)
2083 int change_tag = ((tag_type ==0 && scsi_get_tag_type(SDp) != 0)
2084 || (tag_type != 0 && scsi_get_tag_type(SDp) == 0));
2085 struct NCR_700_Host_Parameters *hostdata =
2086 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2088 scsi_set_tag_type(SDp, tag_type);
2090 /* We have a global (per target) flag to track whether TCQ is
2091 * enabled, so we'll be turning it off for the entire target here.
2092 * our tag algorithm will fail if we mix tagged and untagged commands,
2093 * so quiesce the device before doing this */
2095 scsi_target_quiesce(SDp->sdev_target);
2098 /* shift back to the default unqueued number of commands
2099 * (the user can still raise this) */
2100 scsi_deactivate_tcq(SDp, SDp->host->cmd_per_lun);
2101 hostdata->tag_negotiated &= ~(1 << sdev_id(SDp));
2103 /* Here, we cleared the negotiation flag above, so this
2104 * will force the driver to renegotiate */
2105 scsi_activate_tcq(SDp, SDp->queue_depth);
2107 NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2110 scsi_target_resume(SDp->sdev_target);
2116 NCR_700_show_active_tags(struct device *dev, struct device_attribute *attr, char *buf)
2118 struct scsi_device *SDp = to_scsi_device(dev);
2120 return snprintf(buf, 20, "%d\n", NCR_700_get_depth(SDp));
2123 static struct device_attribute NCR_700_active_tags_attr = {
2125 .name = "active_tags",
2128 .show = NCR_700_show_active_tags,
2131 STATIC struct device_attribute *NCR_700_dev_attrs[] = {
2132 &NCR_700_active_tags_attr,
2136 EXPORT_SYMBOL(NCR_700_detect);
2137 EXPORT_SYMBOL(NCR_700_release);
2138 EXPORT_SYMBOL(NCR_700_intr);
2140 static struct spi_function_template NCR_700_transport_functions = {
2141 .set_period = NCR_700_set_period,
2143 .set_offset = NCR_700_set_offset,
2147 static int __init NCR_700_init(void)
2149 NCR_700_transport_template = spi_attach_transport(&NCR_700_transport_functions);
2150 if(!NCR_700_transport_template)
2155 static void __exit NCR_700_exit(void)
2157 spi_release_transport(NCR_700_transport_template);
2160 module_init(NCR_700_init);
2161 module_exit(NCR_700_exit);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blob