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(hostdata->dev, 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(hostdata->dev, script, MessageLocation,
366 pScript + MSGOUT_OFFSET);
367 script_patch_32(hostdata->dev, script, StatusAddress,
368 pScript + STATUS_OFFSET);
369 script_patch_32(hostdata->dev, 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
627 /* restore the original length */
628 SCp->cmd_len = cmnd[8];
630 NCR_700_unmap(hostdata, SCp, slot);
632 free_slot(slot, hostdata);
634 if(NCR_700_get_depth(SCp->device) == 0 ||
635 NCR_700_get_depth(SCp->device) > SCp->device->queue_depth)
636 printk(KERN_ERR "Invalid depth in NCR_700_scsi_done(): %d\n",
637 NCR_700_get_depth(SCp->device));
638 #endif /* NCR_700_DEBUG */
639 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) - 1);
641 SCp->host_scribble = NULL;
642 SCp->result = result;
645 printk(KERN_ERR "53c700: SCSI DONE HAS NULL SCp\n");
651 NCR_700_internal_bus_reset(struct Scsi_Host *host)
654 NCR_700_writeb(ASSERT_RST, host, SCNTL1_REG);
656 NCR_700_writeb(0, host, SCNTL1_REG);
661 NCR_700_chip_setup(struct Scsi_Host *host)
663 struct NCR_700_Host_Parameters *hostdata =
664 (struct NCR_700_Host_Parameters *)host->hostdata[0];
665 __u32 dcntl_extra = 0;
667 __u8 min_xferp = (hostdata->chip710 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
669 if(hostdata->chip710) {
670 __u8 burst_disable = 0;
671 __u8 burst_length = 0;
673 switch (hostdata->burst_length) {
675 burst_length = BURST_LENGTH_1;
678 burst_length = BURST_LENGTH_2;
681 burst_length = BURST_LENGTH_4;
684 burst_length = BURST_LENGTH_8;
687 burst_disable = BURST_DISABLE;
690 dcntl_extra = COMPAT_700_MODE;
692 NCR_700_writeb(dcntl_extra, host, DCNTL_REG);
693 NCR_700_writeb(burst_length | hostdata->dmode_extra,
694 host, DMODE_710_REG);
695 NCR_700_writeb(burst_disable | (hostdata->differential ?
696 DIFF : 0), host, CTEST7_REG);
697 NCR_700_writeb(BTB_TIMER_DISABLE, host, CTEST0_REG);
698 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY | PARITY
699 | AUTO_ATN, host, SCNTL0_REG);
701 NCR_700_writeb(BURST_LENGTH_8 | hostdata->dmode_extra,
702 host, DMODE_700_REG);
703 NCR_700_writeb(hostdata->differential ?
704 DIFF : 0, host, CTEST7_REG);
706 /* this is for 700-66, does nothing on 700 */
707 NCR_700_writeb(LAST_DIS_ENBL | ENABLE_ACTIVE_NEGATION
708 | GENERATE_RECEIVE_PARITY, host,
711 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY
712 | PARITY | AUTO_ATN, host, SCNTL0_REG);
716 NCR_700_writeb(1 << host->this_id, host, SCID_REG);
717 NCR_700_writeb(0, host, SBCL_REG);
718 NCR_700_writeb(ASYNC_OPERATION, host, SXFER_REG);
720 NCR_700_writeb(PHASE_MM_INT | SEL_TIMEOUT_INT | GROSS_ERR_INT | UX_DISC_INT
721 | RST_INT | PAR_ERR_INT | SELECT_INT, host, SIEN_REG);
723 NCR_700_writeb(ABORT_INT | INT_INST_INT | ILGL_INST_INT, host, DIEN_REG);
724 NCR_700_writeb(ENABLE_SELECT, host, SCNTL1_REG);
725 if(hostdata->clock > 75) {
726 printk(KERN_ERR "53c700: Clock speed %dMHz is too high: 75Mhz is the maximum this chip can be driven at\n", hostdata->clock);
727 /* do the best we can, but the async clock will be out
728 * of spec: sync divider 2, async divider 3 */
729 DEBUG(("53c700: sync 2 async 3\n"));
730 NCR_700_writeb(SYNC_DIV_2_0, host, SBCL_REG);
731 NCR_700_writeb(ASYNC_DIV_3_0 | dcntl_extra, host, DCNTL_REG);
732 hostdata->sync_clock = hostdata->clock/2;
733 } else if(hostdata->clock > 50 && hostdata->clock <= 75) {
734 /* sync divider 1.5, async divider 3 */
735 DEBUG(("53c700: sync 1.5 async 3\n"));
736 NCR_700_writeb(SYNC_DIV_1_5, host, SBCL_REG);
737 NCR_700_writeb(ASYNC_DIV_3_0 | dcntl_extra, host, DCNTL_REG);
738 hostdata->sync_clock = hostdata->clock*2;
739 hostdata->sync_clock /= 3;
741 } else if(hostdata->clock > 37 && hostdata->clock <= 50) {
742 /* sync divider 1, async divider 2 */
743 DEBUG(("53c700: sync 1 async 2\n"));
744 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
745 NCR_700_writeb(ASYNC_DIV_2_0 | dcntl_extra, host, DCNTL_REG);
746 hostdata->sync_clock = hostdata->clock;
747 } else if(hostdata->clock > 25 && hostdata->clock <=37) {
748 /* sync divider 1, async divider 1.5 */
749 DEBUG(("53c700: sync 1 async 1.5\n"));
750 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
751 NCR_700_writeb(ASYNC_DIV_1_5 | dcntl_extra, host, DCNTL_REG);
752 hostdata->sync_clock = hostdata->clock;
754 DEBUG(("53c700: sync 1 async 1\n"));
755 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
756 NCR_700_writeb(ASYNC_DIV_1_0 | dcntl_extra, host, DCNTL_REG);
757 /* sync divider 1, async divider 1 */
758 hostdata->sync_clock = hostdata->clock;
760 /* Calculate the actual minimum period that can be supported
761 * by our synchronous clock speed. See the 710 manual for
762 * exact details of this calculation which is based on a
763 * setting of the SXFER register */
764 min_period = 1000*(4+min_xferp)/(4*hostdata->sync_clock);
765 hostdata->min_period = NCR_700_MIN_PERIOD;
766 if(min_period > NCR_700_MIN_PERIOD)
767 hostdata->min_period = min_period;
771 NCR_700_chip_reset(struct Scsi_Host *host)
773 struct NCR_700_Host_Parameters *hostdata =
774 (struct NCR_700_Host_Parameters *)host->hostdata[0];
775 if(hostdata->chip710) {
776 NCR_700_writeb(SOFTWARE_RESET_710, host, ISTAT_REG);
779 NCR_700_writeb(0, host, ISTAT_REG);
781 NCR_700_writeb(SOFTWARE_RESET, host, DCNTL_REG);
784 NCR_700_writeb(0, host, DCNTL_REG);
789 NCR_700_chip_setup(host);
792 /* The heart of the message processing engine is that the instruction
793 * immediately after the INT is the normal case (and so must be CLEAR
794 * ACK). If we want to do something else, we call that routine in
795 * scripts and set temp to be the normal case + 8 (skipping the CLEAR
796 * ACK) so that the routine returns correctly to resume its activity
799 process_extended_message(struct Scsi_Host *host,
800 struct NCR_700_Host_Parameters *hostdata,
801 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
803 __u32 resume_offset = dsp, temp = dsp + 8;
804 __u8 pun = 0xff, lun = 0xff;
807 pun = SCp->device->id;
808 lun = SCp->device->lun;
811 switch(hostdata->msgin[2]) {
813 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
814 struct scsi_target *starget = SCp->device->sdev_target;
815 __u8 period = hostdata->msgin[3];
816 __u8 offset = hostdata->msgin[4];
818 if(offset == 0 || period == 0) {
823 spi_offset(starget) = offset;
824 spi_period(starget) = period;
826 if(NCR_700_is_flag_set(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION)) {
827 spi_display_xfer_agreement(starget);
828 NCR_700_clear_flag(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION);
831 NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
832 NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
834 NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
838 /* SDTR message out of the blue, reject it */
839 shost_printk(KERN_WARNING, host,
840 "Unexpected SDTR msg\n");
841 hostdata->msgout[0] = A_REJECT_MSG;
842 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
843 script_patch_16(hostdata->dev, hostdata->script,
845 /* SendMsgOut returns, so set up the return
847 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
852 printk(KERN_INFO "scsi%d: (%d:%d), Unsolicited WDTR after CMD, Rejecting\n",
853 host->host_no, pun, lun);
854 hostdata->msgout[0] = A_REJECT_MSG;
855 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
856 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
858 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
863 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
864 host->host_no, pun, lun,
865 NCR_700_phase[(dsps & 0xf00) >> 8]);
866 spi_print_msg(hostdata->msgin);
869 hostdata->msgout[0] = A_REJECT_MSG;
870 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
871 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
873 /* SendMsgOut returns, so set up the return
875 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
877 NCR_700_writel(temp, host, TEMP_REG);
878 return resume_offset;
882 process_message(struct Scsi_Host *host, struct NCR_700_Host_Parameters *hostdata,
883 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
885 /* work out where to return to */
886 __u32 temp = dsp + 8, resume_offset = dsp;
887 __u8 pun = 0xff, lun = 0xff;
890 pun = SCp->device->id;
891 lun = SCp->device->lun;
895 printk("scsi%d (%d:%d): message %s: ", host->host_no, pun, lun,
896 NCR_700_phase[(dsps & 0xf00) >> 8]);
897 spi_print_msg(hostdata->msgin);
901 switch(hostdata->msgin[0]) {
904 resume_offset = process_extended_message(host, hostdata, SCp,
909 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
910 /* Rejected our sync negotiation attempt */
911 spi_period(SCp->device->sdev_target) =
912 spi_offset(SCp->device->sdev_target) = 0;
913 NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
914 NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
915 } else if(SCp != NULL && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION) {
916 /* rejected our first simple tag message */
917 scmd_printk(KERN_WARNING, SCp,
918 "Rejected first tag queue attempt, turning off tag queueing\n");
919 /* we're done negotiating */
920 NCR_700_set_tag_neg_state(SCp->device, NCR_700_FINISHED_TAG_NEGOTIATION);
921 hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
922 SCp->device->tagged_supported = 0;
923 scsi_deactivate_tcq(SCp->device, host->cmd_per_lun);
925 shost_printk(KERN_WARNING, host,
926 "(%d:%d) Unexpected REJECT Message %s\n",
928 NCR_700_phase[(dsps & 0xf00) >> 8]);
929 /* however, just ignore it */
933 case A_PARITY_ERROR_MSG:
934 printk(KERN_ERR "scsi%d (%d:%d) Parity Error!\n", host->host_no,
936 NCR_700_internal_bus_reset(host);
938 case A_SIMPLE_TAG_MSG:
939 printk(KERN_INFO "scsi%d (%d:%d) SIMPLE TAG %d %s\n", host->host_no,
940 pun, lun, hostdata->msgin[1],
941 NCR_700_phase[(dsps & 0xf00) >> 8]);
945 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
946 host->host_no, pun, lun,
947 NCR_700_phase[(dsps & 0xf00) >> 8]);
949 spi_print_msg(hostdata->msgin);
952 hostdata->msgout[0] = A_REJECT_MSG;
953 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
954 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
956 /* SendMsgOut returns, so set up the return
958 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
962 NCR_700_writel(temp, host, TEMP_REG);
963 /* set us up to receive another message */
964 dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
965 return resume_offset;
969 process_script_interrupt(__u32 dsps, __u32 dsp, struct scsi_cmnd *SCp,
970 struct Scsi_Host *host,
971 struct NCR_700_Host_Parameters *hostdata)
973 __u32 resume_offset = 0;
974 __u8 pun = 0xff, lun=0xff;
977 pun = SCp->device->id;
978 lun = SCp->device->lun;
981 if(dsps == A_GOOD_STATUS_AFTER_STATUS) {
982 DEBUG((" COMMAND COMPLETE, status=%02x\n",
983 hostdata->status[0]));
984 /* OK, if TCQ still under negotiation, we now know it works */
985 if (NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION)
986 NCR_700_set_tag_neg_state(SCp->device,
987 NCR_700_FINISHED_TAG_NEGOTIATION);
989 /* check for contingent allegiance contitions */
990 if(status_byte(hostdata->status[0]) == CHECK_CONDITION ||
991 status_byte(hostdata->status[0]) == COMMAND_TERMINATED) {
992 struct NCR_700_command_slot *slot =
993 (struct NCR_700_command_slot *)SCp->host_scribble;
994 if(slot->flags == NCR_700_FLAG_AUTOSENSE) {
995 /* OOPS: bad device, returning another
996 * contingent allegiance condition */
997 scmd_printk(KERN_ERR, SCp,
998 "broken device is looping in contingent allegiance: ignoring\n");
999 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
1002 NCR_700_get_sense_cmnd(SCp->device);
1004 scsi_print_command(SCp);
1005 printk(" cmd %p has status %d, requesting sense\n",
1006 SCp, hostdata->status[0]);
1008 /* we can destroy the command here
1009 * because the contingent allegiance
1010 * condition will cause a retry which
1011 * will re-copy the command from the
1012 * saved data_cmnd. We also unmap any
1013 * data associated with the command
1015 NCR_700_unmap(hostdata, SCp, slot);
1016 dma_unmap_single(hostdata->dev, slot->pCmd,
1020 cmnd[0] = REQUEST_SENSE;
1021 cmnd[1] = (SCp->device->lun & 0x7) << 5;
1024 cmnd[4] = sizeof(SCp->sense_buffer);
1026 /* Here's a quiet hack: the
1027 * REQUEST_SENSE command is six bytes,
1028 * so store a flag indicating that
1029 * this was an internal sense request
1030 * and the original status at the end
1032 cmnd[6] = NCR_700_INTERNAL_SENSE_MAGIC;
1033 cmnd[7] = hostdata->status[0];
1034 cmnd[8] = SCp->cmd_len;
1035 SCp->cmd_len = 6; /* command length for
1037 slot->pCmd = dma_map_single(hostdata->dev, cmnd, MAX_COMMAND_SIZE, DMA_TO_DEVICE);
1038 slot->dma_handle = dma_map_single(hostdata->dev, SCp->sense_buffer, sizeof(SCp->sense_buffer), DMA_FROM_DEVICE);
1039 slot->SG[0].ins = bS_to_host(SCRIPT_MOVE_DATA_IN | sizeof(SCp->sense_buffer));
1040 slot->SG[0].pAddr = bS_to_host(slot->dma_handle);
1041 slot->SG[1].ins = bS_to_host(SCRIPT_RETURN);
1042 slot->SG[1].pAddr = 0;
1043 slot->resume_offset = hostdata->pScript;
1044 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG[0])*2, DMA_TO_DEVICE);
1045 dma_cache_sync(hostdata->dev, SCp->sense_buffer, sizeof(SCp->sense_buffer), DMA_FROM_DEVICE);
1047 /* queue the command for reissue */
1048 slot->state = NCR_700_SLOT_QUEUED;
1049 slot->flags = NCR_700_FLAG_AUTOSENSE;
1050 hostdata->state = NCR_700_HOST_FREE;
1051 hostdata->cmd = NULL;
1054 // Currently rely on the mid layer evaluation
1055 // of the tag queuing capability
1057 //if(status_byte(hostdata->status[0]) == GOOD &&
1058 // SCp->cmnd[0] == INQUIRY && SCp->use_sg == 0) {
1059 // /* Piggy back the tag queueing support
1060 // * on this command */
1061 // dma_sync_single_for_cpu(hostdata->dev,
1062 // slot->dma_handle,
1063 // SCp->request_bufflen,
1064 // DMA_FROM_DEVICE);
1065 // if(((char *)SCp->request_buffer)[7] & 0x02) {
1066 // scmd_printk(KERN_INFO, SCp,
1067 // "Enabling Tag Command Queuing\n");
1068 // hostdata->tag_negotiated |= (1<<scmd_id(SCp));
1069 // NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1071 // NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1072 // hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
1075 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
1077 } else if((dsps & 0xfffff0f0) == A_UNEXPECTED_PHASE) {
1078 __u8 i = (dsps & 0xf00) >> 8;
1080 scmd_printk(KERN_ERR, SCp, "UNEXPECTED PHASE %s (%s)\n",
1082 sbcl_to_string(NCR_700_readb(host, SBCL_REG)));
1083 scmd_printk(KERN_ERR, SCp, " len = %d, cmd =",
1085 scsi_print_command(SCp);
1087 NCR_700_internal_bus_reset(host);
1088 } else if((dsps & 0xfffff000) == A_FATAL) {
1089 int i = (dsps & 0xfff);
1091 printk(KERN_ERR "scsi%d: (%d:%d) FATAL ERROR: %s\n",
1092 host->host_no, pun, lun, NCR_700_fatal_messages[i]);
1093 if(dsps == A_FATAL_ILLEGAL_MSG_LENGTH) {
1094 printk(KERN_ERR " msg begins %02x %02x\n",
1095 hostdata->msgin[0], hostdata->msgin[1]);
1097 NCR_700_internal_bus_reset(host);
1098 } else if((dsps & 0xfffff0f0) == A_DISCONNECT) {
1099 #ifdef NCR_700_DEBUG
1100 __u8 i = (dsps & 0xf00) >> 8;
1102 printk("scsi%d: (%d:%d), DISCONNECTED (%d) %s\n",
1103 host->host_no, pun, lun,
1104 i, NCR_700_phase[i]);
1106 save_for_reselection(hostdata, SCp, dsp);
1108 } else if(dsps == A_RESELECTION_IDENTIFIED) {
1110 struct NCR_700_command_slot *slot;
1111 __u8 reselection_id = hostdata->reselection_id;
1112 struct scsi_device *SDp;
1114 lun = hostdata->msgin[0] & 0x1f;
1116 hostdata->reselection_id = 0xff;
1117 DEBUG(("scsi%d: (%d:%d) RESELECTED!\n",
1118 host->host_no, reselection_id, lun));
1119 /* clear the reselection indicator */
1120 SDp = __scsi_device_lookup(host, 0, reselection_id, lun);
1121 if(unlikely(SDp == NULL)) {
1122 printk(KERN_ERR "scsi%d: (%d:%d) HAS NO device\n",
1123 host->host_no, reselection_id, lun);
1126 if(hostdata->msgin[1] == A_SIMPLE_TAG_MSG) {
1127 struct scsi_cmnd *SCp = scsi_find_tag(SDp, hostdata->msgin[2]);
1128 if(unlikely(SCp == NULL)) {
1129 printk(KERN_ERR "scsi%d: (%d:%d) no saved request for tag %d\n",
1130 host->host_no, reselection_id, lun, hostdata->msgin[2]);
1134 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1135 DDEBUG(KERN_DEBUG, SDp,
1136 "reselection is tag %d, slot %p(%d)\n",
1137 hostdata->msgin[2], slot, slot->tag);
1139 struct scsi_cmnd *SCp = scsi_find_tag(SDp, SCSI_NO_TAG);
1140 if(unlikely(SCp == NULL)) {
1141 sdev_printk(KERN_ERR, SDp,
1142 "no saved request for untagged cmd\n");
1145 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1149 printk(KERN_ERR "scsi%d: (%d:%d) RESELECTED but no saved command (MSG = %02x %02x %02x)!!\n",
1150 host->host_no, reselection_id, lun,
1151 hostdata->msgin[0], hostdata->msgin[1],
1152 hostdata->msgin[2]);
1154 if(hostdata->state != NCR_700_HOST_BUSY)
1155 printk(KERN_ERR "scsi%d: FATAL, host not busy during valid reselection!\n",
1157 resume_offset = slot->resume_offset;
1158 hostdata->cmd = slot->cmnd;
1160 /* re-patch for this command */
1161 script_patch_32_abs(hostdata->dev, hostdata->script,
1162 CommandAddress, slot->pCmd);
1163 script_patch_16(hostdata->dev, hostdata->script,
1164 CommandCount, slot->cmnd->cmd_len);
1165 script_patch_32_abs(hostdata->dev, hostdata->script,
1166 SGScriptStartAddress,
1167 to32bit(&slot->pSG[0].ins));
1169 /* Note: setting SXFER only works if we're
1170 * still in the MESSAGE phase, so it is vital
1171 * that ACK is still asserted when we process
1172 * the reselection message. The resume offset
1173 * should therefore always clear ACK */
1174 NCR_700_writeb(NCR_700_get_SXFER(hostdata->cmd->device),
1176 dma_cache_sync(hostdata->dev, hostdata->msgin,
1177 MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
1178 dma_cache_sync(hostdata->dev, hostdata->msgout,
1179 MSG_ARRAY_SIZE, DMA_TO_DEVICE);
1180 /* I'm just being paranoid here, the command should
1181 * already have been flushed from the cache */
1182 dma_cache_sync(hostdata->dev, slot->cmnd->cmnd,
1183 slot->cmnd->cmd_len, DMA_TO_DEVICE);
1188 } else if(dsps == A_RESELECTED_DURING_SELECTION) {
1190 /* This section is full of debugging code because I've
1191 * never managed to reach it. I think what happens is
1192 * that, because the 700 runs with selection
1193 * interrupts enabled the whole time that we take a
1194 * selection interrupt before we manage to get to the
1195 * reselected script interrupt */
1197 __u8 reselection_id = NCR_700_readb(host, SFBR_REG);
1198 struct NCR_700_command_slot *slot;
1200 /* Take out our own ID */
1201 reselection_id &= ~(1<<host->this_id);
1203 /* I've never seen this happen, so keep this as a printk rather
1205 printk(KERN_INFO "scsi%d: (%d:%d) RESELECTION DURING SELECTION, dsp=%08x[%04x] state=%d, count=%d\n",
1206 host->host_no, reselection_id, lun, dsp, dsp - hostdata->pScript, hostdata->state, hostdata->command_slot_count);
1209 /* FIXME: DEBUGGING CODE */
1210 __u32 SG = (__u32)bS_to_cpu(hostdata->script[A_SGScriptStartAddress_used[0]]);
1213 for(i=0; i< NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1214 if(SG >= to32bit(&hostdata->slots[i].pSG[0])
1215 && SG <= to32bit(&hostdata->slots[i].pSG[NCR_700_SG_SEGMENTS]))
1218 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);
1219 SCp = hostdata->slots[i].cmnd;
1223 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1224 /* change slot from busy to queued to redo command */
1225 slot->state = NCR_700_SLOT_QUEUED;
1227 hostdata->cmd = NULL;
1229 if(reselection_id == 0) {
1230 if(hostdata->reselection_id == 0xff) {
1231 printk(KERN_ERR "scsi%d: Invalid reselection during selection!!\n", host->host_no);
1234 printk(KERN_ERR "scsi%d: script reselected and we took a selection interrupt\n",
1236 reselection_id = hostdata->reselection_id;
1240 /* convert to real ID */
1241 reselection_id = bitmap_to_number(reselection_id);
1243 hostdata->reselection_id = reselection_id;
1244 /* just in case we have a stale simple tag message, clear it */
1245 hostdata->msgin[1] = 0;
1246 dma_cache_sync(hostdata->dev, hostdata->msgin,
1247 MSG_ARRAY_SIZE, DMA_BIDIRECTIONAL);
1248 if(hostdata->tag_negotiated & (1<<reselection_id)) {
1249 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1251 resume_offset = hostdata->pScript + Ent_GetReselectionData;
1253 } else if(dsps == A_COMPLETED_SELECTION_AS_TARGET) {
1254 /* we've just disconnected from the bus, do nothing since
1255 * a return here will re-run the queued command slot
1256 * that may have been interrupted by the initial selection */
1257 DEBUG((" SELECTION COMPLETED\n"));
1258 } else if((dsps & 0xfffff0f0) == A_MSG_IN) {
1259 resume_offset = process_message(host, hostdata, SCp,
1261 } else if((dsps & 0xfffff000) == 0) {
1262 __u8 i = (dsps & 0xf0) >> 4, j = (dsps & 0xf00) >> 8;
1263 printk(KERN_ERR "scsi%d: (%d:%d), unhandled script condition %s %s at %04x\n",
1264 host->host_no, pun, lun, NCR_700_condition[i],
1265 NCR_700_phase[j], dsp - hostdata->pScript);
1267 scsi_print_command(SCp);
1270 for(i = 0; i < SCp->use_sg + 1; i++) {
1271 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);
1275 NCR_700_internal_bus_reset(host);
1276 } else if((dsps & 0xfffff000) == A_DEBUG_INTERRUPT) {
1277 printk(KERN_NOTICE "scsi%d (%d:%d) DEBUG INTERRUPT %d AT %08x[%04x], continuing\n",
1278 host->host_no, pun, lun, dsps & 0xfff, dsp, dsp - hostdata->pScript);
1279 resume_offset = dsp;
1281 printk(KERN_ERR "scsi%d: (%d:%d), unidentified script interrupt 0x%x at %04x\n",
1282 host->host_no, pun, lun, dsps, dsp - hostdata->pScript);
1283 NCR_700_internal_bus_reset(host);
1285 return resume_offset;
1288 /* We run the 53c700 with selection interrupts always enabled. This
1289 * means that the chip may be selected as soon as the bus frees. On a
1290 * busy bus, this can be before the scripts engine finishes its
1291 * processing. Therefore, part of the selection processing has to be
1292 * to find out what the scripts engine is doing and complete the
1293 * function if necessary (i.e. process the pending disconnect or save
1294 * the interrupted initial selection */
1296 process_selection(struct Scsi_Host *host, __u32 dsp)
1298 __u8 id = 0; /* Squash compiler warning */
1300 __u32 resume_offset = 0;
1301 struct NCR_700_Host_Parameters *hostdata =
1302 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1303 struct scsi_cmnd *SCp = hostdata->cmd;
1306 for(count = 0; count < 5; count++) {
1307 id = NCR_700_readb(host, hostdata->chip710 ?
1308 CTEST9_REG : SFBR_REG);
1310 /* Take out our own ID */
1311 id &= ~(1<<host->this_id);
1316 sbcl = NCR_700_readb(host, SBCL_REG);
1317 if((sbcl & SBCL_IO) == 0) {
1318 /* mark as having been selected rather than reselected */
1321 /* convert to real ID */
1322 hostdata->reselection_id = id = bitmap_to_number(id);
1323 DEBUG(("scsi%d: Reselected by %d\n",
1324 host->host_no, id));
1326 if(hostdata->state == NCR_700_HOST_BUSY && SCp != NULL) {
1327 struct NCR_700_command_slot *slot =
1328 (struct NCR_700_command_slot *)SCp->host_scribble;
1329 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));
1331 switch(dsp - hostdata->pScript) {
1332 case Ent_Disconnect1:
1333 case Ent_Disconnect2:
1334 save_for_reselection(hostdata, SCp, Ent_Disconnect2 + hostdata->pScript);
1336 case Ent_Disconnect3:
1337 case Ent_Disconnect4:
1338 save_for_reselection(hostdata, SCp, Ent_Disconnect4 + hostdata->pScript);
1340 case Ent_Disconnect5:
1341 case Ent_Disconnect6:
1342 save_for_reselection(hostdata, SCp, Ent_Disconnect6 + hostdata->pScript);
1344 case Ent_Disconnect7:
1345 case Ent_Disconnect8:
1346 save_for_reselection(hostdata, SCp, Ent_Disconnect8 + hostdata->pScript);
1350 process_script_interrupt(A_GOOD_STATUS_AFTER_STATUS, dsp, SCp, host, hostdata);
1354 slot->state = NCR_700_SLOT_QUEUED;
1358 hostdata->state = NCR_700_HOST_BUSY;
1359 hostdata->cmd = NULL;
1360 /* clear any stale simple tag message */
1361 hostdata->msgin[1] = 0;
1362 dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE,
1366 /* Selected as target, Ignore */
1367 resume_offset = hostdata->pScript + Ent_SelectedAsTarget;
1368 } else if(hostdata->tag_negotiated & (1<<id)) {
1369 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1371 resume_offset = hostdata->pScript + Ent_GetReselectionData;
1373 return resume_offset;
1377 NCR_700_clear_fifo(struct Scsi_Host *host) {
1378 const struct NCR_700_Host_Parameters *hostdata
1379 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1380 if(hostdata->chip710) {
1381 NCR_700_writeb(CLR_FIFO_710, host, CTEST8_REG);
1383 NCR_700_writeb(CLR_FIFO, host, DFIFO_REG);
1388 NCR_700_flush_fifo(struct Scsi_Host *host) {
1389 const struct NCR_700_Host_Parameters *hostdata
1390 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1391 if(hostdata->chip710) {
1392 NCR_700_writeb(FLUSH_DMA_FIFO_710, host, CTEST8_REG);
1394 NCR_700_writeb(0, host, CTEST8_REG);
1396 NCR_700_writeb(FLUSH_DMA_FIFO, host, DFIFO_REG);
1398 NCR_700_writeb(0, host, DFIFO_REG);
1403 /* The queue lock with interrupts disabled must be held on entry to
1406 NCR_700_start_command(struct scsi_cmnd *SCp)
1408 struct NCR_700_command_slot *slot =
1409 (struct NCR_700_command_slot *)SCp->host_scribble;
1410 struct NCR_700_Host_Parameters *hostdata =
1411 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1412 __u16 count = 1; /* for IDENTIFY message */
1414 if(hostdata->state != NCR_700_HOST_FREE) {
1415 /* keep this inside the lock to close the race window where
1416 * the running command finishes on another CPU while we don't
1417 * change the state to queued on this one */
1418 slot->state = NCR_700_SLOT_QUEUED;
1420 DEBUG(("scsi%d: host busy, queueing command %p, slot %p\n",
1421 SCp->device->host->host_no, slot->cmnd, slot));
1424 hostdata->state = NCR_700_HOST_BUSY;
1425 hostdata->cmd = SCp;
1426 slot->state = NCR_700_SLOT_BUSY;
1427 /* keep interrupts disabled until we have the command correctly
1428 * set up so we cannot take a selection interrupt */
1430 hostdata->msgout[0] = NCR_700_identify((SCp->cmnd[0] != REQUEST_SENSE &&
1431 slot->flags != NCR_700_FLAG_AUTOSENSE),
1433 /* for INQUIRY or REQUEST_SENSE commands, we cannot be sure
1434 * if the negotiated transfer parameters still hold, so
1435 * always renegotiate them */
1436 if(SCp->cmnd[0] == INQUIRY || SCp->cmnd[0] == REQUEST_SENSE ||
1437 slot->flags == NCR_700_FLAG_AUTOSENSE) {
1438 NCR_700_clear_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
1441 /* REQUEST_SENSE is asking for contingent I_T_L(_Q) status.
1442 * If a contingent allegiance condition exists, the device
1443 * will refuse all tags, so send the request sense as untagged
1445 if((hostdata->tag_negotiated & (1<<scmd_id(SCp)))
1446 && (slot->tag != SCSI_NO_TAG && SCp->cmnd[0] != REQUEST_SENSE &&
1447 slot->flags != NCR_700_FLAG_AUTOSENSE)) {
1448 count += scsi_populate_tag_msg(SCp, &hostdata->msgout[count]);
1451 if(hostdata->fast &&
1452 NCR_700_is_flag_clear(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC)) {
1453 count += spi_populate_sync_msg(&hostdata->msgout[count],
1454 spi_period(SCp->device->sdev_target),
1455 spi_offset(SCp->device->sdev_target));
1456 NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
1459 script_patch_16(hostdata->dev, hostdata->script, MessageCount, count);
1462 script_patch_ID(hostdata->dev, hostdata->script,
1463 Device_ID, 1<<scmd_id(SCp));
1465 script_patch_32_abs(hostdata->dev, hostdata->script, CommandAddress,
1467 script_patch_16(hostdata->dev, hostdata->script, CommandCount,
1469 /* finally plumb the beginning of the SG list into the script
1471 script_patch_32_abs(hostdata->dev, hostdata->script,
1472 SGScriptStartAddress, to32bit(&slot->pSG[0].ins));
1473 NCR_700_clear_fifo(SCp->device->host);
1475 if(slot->resume_offset == 0)
1476 slot->resume_offset = hostdata->pScript;
1477 /* now perform all the writebacks and invalidates */
1478 dma_cache_sync(hostdata->dev, hostdata->msgout, count, DMA_TO_DEVICE);
1479 dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE,
1481 dma_cache_sync(hostdata->dev, SCp->cmnd, SCp->cmd_len, DMA_TO_DEVICE);
1482 dma_cache_sync(hostdata->dev, hostdata->status, 1, DMA_FROM_DEVICE);
1484 /* set the synchronous period/offset */
1485 NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
1486 SCp->device->host, SXFER_REG);
1487 NCR_700_writel(slot->temp, SCp->device->host, TEMP_REG);
1488 NCR_700_writel(slot->resume_offset, SCp->device->host, DSP_REG);
1494 NCR_700_intr(int irq, void *dev_id)
1496 struct Scsi_Host *host = (struct Scsi_Host *)dev_id;
1497 struct NCR_700_Host_Parameters *hostdata =
1498 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1500 __u32 resume_offset = 0;
1501 __u8 pun = 0xff, lun = 0xff;
1502 unsigned long flags;
1505 /* Use the host lock to serialise acess to the 53c700
1506 * hardware. Note: In future, we may need to take the queue
1507 * lock to enter the done routines. When that happens, we
1508 * need to ensure that for this driver, the host lock and the
1509 * queue lock point to the same thing. */
1510 spin_lock_irqsave(host->host_lock, flags);
1511 if((istat = NCR_700_readb(host, ISTAT_REG))
1512 & (SCSI_INT_PENDING | DMA_INT_PENDING)) {
1514 __u8 sstat0 = 0, dstat = 0;
1516 struct scsi_cmnd *SCp = hostdata->cmd;
1517 enum NCR_700_Host_State state;
1520 state = hostdata->state;
1521 SCp = hostdata->cmd;
1523 if(istat & SCSI_INT_PENDING) {
1526 sstat0 = NCR_700_readb(host, SSTAT0_REG);
1529 if(istat & DMA_INT_PENDING) {
1532 dstat = NCR_700_readb(host, DSTAT_REG);
1535 dsps = NCR_700_readl(host, DSPS_REG);
1536 dsp = NCR_700_readl(host, DSP_REG);
1538 DEBUG(("scsi%d: istat %02x sstat0 %02x dstat %02x dsp %04x[%08x] dsps 0x%x\n",
1539 host->host_no, istat, sstat0, dstat,
1540 (dsp - (__u32)(hostdata->pScript))/4,
1544 pun = SCp->device->id;
1545 lun = SCp->device->lun;
1548 if(sstat0 & SCSI_RESET_DETECTED) {
1549 struct scsi_device *SDp;
1552 hostdata->state = NCR_700_HOST_BUSY;
1554 printk(KERN_ERR "scsi%d: Bus Reset detected, executing command %p, slot %p, dsp %08x[%04x]\n",
1555 host->host_no, SCp, SCp == NULL ? NULL : SCp->host_scribble, dsp, dsp - hostdata->pScript);
1557 scsi_report_bus_reset(host, 0);
1559 /* clear all the negotiated parameters */
1560 __shost_for_each_device(SDp, host)
1561 NCR_700_clear_flag(SDp, ~0);
1563 /* clear all the slots and their pending commands */
1564 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1565 struct scsi_cmnd *SCp;
1566 struct NCR_700_command_slot *slot =
1567 &hostdata->slots[i];
1569 if(slot->state == NCR_700_SLOT_FREE)
1573 printk(KERN_ERR " failing command because of reset, slot %p, cmnd %p\n",
1575 free_slot(slot, hostdata);
1576 SCp->host_scribble = NULL;
1577 NCR_700_set_depth(SCp->device, 0);
1578 /* NOTE: deadlock potential here: we
1579 * rely on mid-layer guarantees that
1580 * scsi_done won't try to issue the
1581 * command again otherwise we'll
1583 * hostdata->state_lock */
1584 SCp->result = DID_RESET << 16;
1585 SCp->scsi_done(SCp);
1588 NCR_700_chip_setup(host);
1590 hostdata->state = NCR_700_HOST_FREE;
1591 hostdata->cmd = NULL;
1592 /* signal back if this was an eh induced reset */
1593 if(hostdata->eh_complete != NULL)
1594 complete(hostdata->eh_complete);
1596 } else if(sstat0 & SELECTION_TIMEOUT) {
1597 DEBUG(("scsi%d: (%d:%d) selection timeout\n",
1598 host->host_no, pun, lun));
1599 NCR_700_scsi_done(hostdata, SCp, DID_NO_CONNECT<<16);
1600 } else if(sstat0 & PHASE_MISMATCH) {
1601 struct NCR_700_command_slot *slot = (SCp == NULL) ? NULL :
1602 (struct NCR_700_command_slot *)SCp->host_scribble;
1604 if(dsp == Ent_SendMessage + 8 + hostdata->pScript) {
1605 /* It wants to reply to some part of
1607 #ifdef NCR_700_DEBUG
1608 __u32 temp = NCR_700_readl(host, TEMP_REG);
1609 int count = (hostdata->script[Ent_SendMessage/4] & 0xffffff) - ((NCR_700_readl(host, DBC_REG) & 0xffffff) + NCR_700_data_residual(host));
1610 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)));
1612 resume_offset = hostdata->pScript + Ent_SendMessagePhaseMismatch;
1613 } else if(dsp >= to32bit(&slot->pSG[0].ins) &&
1614 dsp <= to32bit(&slot->pSG[NCR_700_SG_SEGMENTS].ins)) {
1615 int data_transfer = NCR_700_readl(host, DBC_REG) & 0xffffff;
1616 int SGcount = (dsp - to32bit(&slot->pSG[0].ins))/sizeof(struct NCR_700_SG_List);
1617 int residual = NCR_700_data_residual(host);
1619 #ifdef NCR_700_DEBUG
1620 __u32 naddr = NCR_700_readl(host, DNAD_REG);
1622 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x\n",
1623 host->host_no, pun, lun,
1624 SGcount, data_transfer);
1625 scsi_print_command(SCp);
1627 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x, residual %d\n",
1628 host->host_no, pun, lun,
1629 SGcount, data_transfer, residual);
1632 data_transfer += residual;
1634 if(data_transfer != 0) {
1640 count = (bS_to_cpu(slot->SG[SGcount].ins) & 0x00ffffff);
1641 DEBUG(("DATA TRANSFER MISMATCH, count = %d, transferred %d\n", count, count-data_transfer));
1642 slot->SG[SGcount].ins &= bS_to_host(0xff000000);
1643 slot->SG[SGcount].ins |= bS_to_host(data_transfer);
1644 pAddr = bS_to_cpu(slot->SG[SGcount].pAddr);
1645 pAddr += (count - data_transfer);
1646 #ifdef NCR_700_DEBUG
1647 if(pAddr != naddr) {
1648 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);
1651 slot->SG[SGcount].pAddr = bS_to_host(pAddr);
1653 /* set the executed moves to nops */
1654 for(i=0; i<SGcount; i++) {
1655 slot->SG[i].ins = bS_to_host(SCRIPT_NOP);
1656 slot->SG[i].pAddr = 0;
1658 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1659 /* and pretend we disconnected after
1660 * the command phase */
1661 resume_offset = hostdata->pScript + Ent_MsgInDuringData;
1662 /* make sure all the data is flushed */
1663 NCR_700_flush_fifo(host);
1665 __u8 sbcl = NCR_700_readb(host, SBCL_REG);
1666 printk(KERN_ERR "scsi%d: (%d:%d) phase mismatch at %04x, phase %s\n",
1667 host->host_no, pun, lun, dsp - hostdata->pScript, sbcl_to_string(sbcl));
1668 NCR_700_internal_bus_reset(host);
1671 } else if(sstat0 & SCSI_GROSS_ERROR) {
1672 printk(KERN_ERR "scsi%d: (%d:%d) GROSS ERROR\n",
1673 host->host_no, pun, lun);
1674 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1675 } else if(sstat0 & PARITY_ERROR) {
1676 printk(KERN_ERR "scsi%d: (%d:%d) PARITY ERROR\n",
1677 host->host_no, pun, lun);
1678 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1679 } else if(dstat & SCRIPT_INT_RECEIVED) {
1680 DEBUG(("scsi%d: (%d:%d) ====>SCRIPT INTERRUPT<====\n",
1681 host->host_no, pun, lun));
1682 resume_offset = process_script_interrupt(dsps, dsp, SCp, host, hostdata);
1683 } else if(dstat & (ILGL_INST_DETECTED)) {
1684 printk(KERN_ERR "scsi%d: (%d:%d) Illegal Instruction detected at 0x%08x[0x%x]!!!\n"
1685 " Please email James.Bottomley@HansenPartnership.com with the details\n",
1686 host->host_no, pun, lun,
1687 dsp, dsp - hostdata->pScript);
1688 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1689 } else if(dstat & (WATCH_DOG_INTERRUPT|ABORTED)) {
1690 printk(KERN_ERR "scsi%d: (%d:%d) serious DMA problem, dstat=%02x\n",
1691 host->host_no, pun, lun, dstat);
1692 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1696 /* NOTE: selection interrupt processing MUST occur
1697 * after script interrupt processing to correctly cope
1698 * with the case where we process a disconnect and
1699 * then get reselected before we process the
1701 if(sstat0 & SELECTED) {
1702 /* FIXME: It currently takes at least FOUR
1703 * interrupts to complete a command that
1704 * disconnects: one for the disconnect, one
1705 * for the reselection, one to get the
1706 * reselection data and one to complete the
1707 * command. If we guess the reselected
1708 * command here and prepare it, we only need
1709 * to get a reselection data interrupt if we
1710 * guessed wrongly. Since the interrupt
1711 * overhead is much greater than the command
1712 * setup, this would be an efficient
1713 * optimisation particularly as we probably
1714 * only have one outstanding command on a
1715 * target most of the time */
1717 resume_offset = process_selection(host, dsp);
1724 if(hostdata->state != NCR_700_HOST_BUSY) {
1725 printk(KERN_ERR "scsi%d: Driver error: resume at 0x%08x [0x%04x] with non busy host!\n",
1726 host->host_no, resume_offset, resume_offset - hostdata->pScript);
1727 hostdata->state = NCR_700_HOST_BUSY;
1730 DEBUG(("Attempting to resume at %x\n", resume_offset));
1731 NCR_700_clear_fifo(host);
1732 NCR_700_writel(resume_offset, host, DSP_REG);
1734 /* There is probably a technical no-no about this: If we're a
1735 * shared interrupt and we got this interrupt because the
1736 * other device needs servicing not us, we're still going to
1737 * check our queued commands here---of course, there shouldn't
1738 * be any outstanding.... */
1739 if(hostdata->state == NCR_700_HOST_FREE) {
1742 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1743 /* fairness: always run the queue from the last
1744 * position we left off */
1745 int j = (i + hostdata->saved_slot_position)
1746 % NCR_700_COMMAND_SLOTS_PER_HOST;
1748 if(hostdata->slots[j].state != NCR_700_SLOT_QUEUED)
1750 if(NCR_700_start_command(hostdata->slots[j].cmnd)) {
1751 DEBUG(("scsi%d: Issuing saved command slot %p, cmd %p\t\n",
1752 host->host_no, &hostdata->slots[j],
1753 hostdata->slots[j].cmnd));
1754 hostdata->saved_slot_position = j + 1;
1761 spin_unlock_irqrestore(host->host_lock, flags);
1762 return IRQ_RETVAL(handled);
1766 NCR_700_queuecommand(struct scsi_cmnd *SCp, void (*done)(struct scsi_cmnd *))
1768 struct NCR_700_Host_Parameters *hostdata =
1769 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1771 enum dma_data_direction direction;
1772 struct NCR_700_command_slot *slot;
1774 if(hostdata->command_slot_count >= NCR_700_COMMAND_SLOTS_PER_HOST) {
1775 /* We're over our allocation, this should never happen
1776 * since we report the max allocation to the mid layer */
1777 printk(KERN_WARNING "scsi%d: Command depth has gone over queue depth\n", SCp->device->host->host_no);
1780 /* check for untagged commands. We cannot have any outstanding
1781 * commands if we accept them. Commands could be untagged because:
1783 * - The tag negotiated bitmap is clear
1784 * - The blk layer sent and untagged command
1786 if(NCR_700_get_depth(SCp->device) != 0
1787 && (!(hostdata->tag_negotiated & (1<<scmd_id(SCp)))
1788 || !blk_rq_tagged(SCp->request))) {
1789 CDEBUG(KERN_ERR, SCp, "has non zero depth %d\n",
1790 NCR_700_get_depth(SCp->device));
1791 return SCSI_MLQUEUE_DEVICE_BUSY;
1793 if(NCR_700_get_depth(SCp->device) >= SCp->device->queue_depth) {
1794 CDEBUG(KERN_ERR, SCp, "has max tag depth %d\n",
1795 NCR_700_get_depth(SCp->device));
1796 return SCSI_MLQUEUE_DEVICE_BUSY;
1798 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) + 1);
1800 /* begin the command here */
1801 /* no need to check for NULL, test for command_slot_count above
1802 * ensures a slot is free */
1803 slot = find_empty_slot(hostdata);
1807 SCp->scsi_done = done;
1808 SCp->host_scribble = (unsigned char *)slot;
1809 SCp->SCp.ptr = NULL;
1810 SCp->SCp.buffer = NULL;
1812 #ifdef NCR_700_DEBUG
1813 printk("53c700: scsi%d, command ", SCp->device->host->host_no);
1814 scsi_print_command(SCp);
1816 if(blk_rq_tagged(SCp->request)
1817 && (hostdata->tag_negotiated &(1<<scmd_id(SCp))) == 0
1818 && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_START_TAG_NEGOTIATION) {
1819 scmd_printk(KERN_ERR, SCp, "Enabling Tag Command Queuing\n");
1820 hostdata->tag_negotiated |= (1<<scmd_id(SCp));
1821 NCR_700_set_tag_neg_state(SCp->device, NCR_700_DURING_TAG_NEGOTIATION);
1824 /* here we may have to process an untagged command. The gate
1825 * above ensures that this will be the only one outstanding,
1826 * so clear the tag negotiated bit.
1828 * FIXME: This will royally screw up on multiple LUN devices
1830 if(!blk_rq_tagged(SCp->request)
1831 && (hostdata->tag_negotiated &(1<<scmd_id(SCp)))) {
1832 scmd_printk(KERN_INFO, SCp, "Disabling Tag Command Queuing\n");
1833 hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
1836 if((hostdata->tag_negotiated &(1<<scmd_id(SCp)))
1837 && scsi_get_tag_type(SCp->device)) {
1838 slot->tag = SCp->request->tag;
1839 CDEBUG(KERN_DEBUG, SCp, "sending out tag %d, slot %p\n",
1842 slot->tag = SCSI_NO_TAG;
1843 /* must populate current_cmnd for scsi_find_tag to work */
1844 SCp->device->current_cmnd = SCp;
1846 /* sanity check: some of the commands generated by the mid-layer
1847 * have an eccentric idea of their sc_data_direction */
1848 if(!SCp->use_sg && !SCp->request_bufflen
1849 && SCp->sc_data_direction != DMA_NONE) {
1850 #ifdef NCR_700_DEBUG
1851 printk("53c700: Command");
1852 scsi_print_command(SCp);
1853 printk("Has wrong data direction %d\n", SCp->sc_data_direction);
1855 SCp->sc_data_direction = DMA_NONE;
1858 switch (SCp->cmnd[0]) {
1860 /* clear the internal sense magic */
1864 /* OK, get it from the command */
1865 switch(SCp->sc_data_direction) {
1866 case DMA_BIDIRECTIONAL:
1868 printk(KERN_ERR "53c700: Unknown command for data direction ");
1869 scsi_print_command(SCp);
1876 case DMA_FROM_DEVICE:
1877 move_ins = SCRIPT_MOVE_DATA_IN;
1880 move_ins = SCRIPT_MOVE_DATA_OUT;
1885 /* now build the scatter gather list */
1886 direction = SCp->sc_data_direction;
1890 dma_addr_t vPtr = 0;
1894 sg_count = dma_map_sg(hostdata->dev,
1895 SCp->request_buffer, SCp->use_sg,
1898 vPtr = dma_map_single(hostdata->dev,
1899 SCp->request_buffer,
1900 SCp->request_bufflen,
1902 count = SCp->request_bufflen;
1903 slot->dma_handle = vPtr;
1908 for(i = 0; i < sg_count; i++) {
1911 struct scatterlist *sg = SCp->request_buffer;
1913 vPtr = sg_dma_address(&sg[i]);
1914 count = sg_dma_len(&sg[i]);
1917 slot->SG[i].ins = bS_to_host(move_ins | count);
1918 DEBUG((" scatter block %d: move %d[%08x] from 0x%lx\n",
1919 i, count, slot->SG[i].ins, (unsigned long)vPtr));
1920 slot->SG[i].pAddr = bS_to_host(vPtr);
1922 slot->SG[i].ins = bS_to_host(SCRIPT_RETURN);
1923 slot->SG[i].pAddr = 0;
1924 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1925 DEBUG((" SETTING %08lx to %x\n",
1926 (&slot->pSG[i].ins),
1929 slot->resume_offset = 0;
1930 slot->pCmd = dma_map_single(hostdata->dev, SCp->cmnd,
1931 sizeof(SCp->cmnd), DMA_TO_DEVICE);
1932 NCR_700_start_command(SCp);
1937 NCR_700_abort(struct scsi_cmnd * SCp)
1939 struct NCR_700_command_slot *slot;
1941 scmd_printk(KERN_INFO, SCp,
1942 "New error handler wants to abort command\n\t");
1943 scsi_print_command(SCp);
1945 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1948 /* no outstanding command to abort */
1950 if(SCp->cmnd[0] == TEST_UNIT_READY) {
1951 /* FIXME: This is because of a problem in the new
1952 * error handler. When it is in error recovery, it
1953 * will send a TUR to a device it thinks may still be
1954 * showing a problem. If the TUR isn't responded to,
1955 * it will abort it and mark the device off line.
1956 * Unfortunately, it does no other error recovery, so
1957 * this would leave us with an outstanding command
1958 * occupying a slot. Rather than allow this to
1959 * happen, we issue a bus reset to force all
1960 * outstanding commands to terminate here. */
1961 NCR_700_internal_bus_reset(SCp->device->host);
1962 /* still drop through and return failed */
1969 NCR_700_bus_reset(struct scsi_cmnd * SCp)
1971 DECLARE_COMPLETION_ONSTACK(complete);
1972 struct NCR_700_Host_Parameters *hostdata =
1973 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1975 scmd_printk(KERN_INFO, SCp,
1976 "New error handler wants BUS reset, cmd %p\n\t", SCp);
1977 scsi_print_command(SCp);
1979 /* In theory, eh_complete should always be null because the
1980 * eh is single threaded, but just in case we're handling a
1981 * reset via sg or something */
1982 spin_lock_irq(SCp->device->host->host_lock);
1983 while (hostdata->eh_complete != NULL) {
1984 spin_unlock_irq(SCp->device->host->host_lock);
1985 msleep_interruptible(100);
1986 spin_lock_irq(SCp->device->host->host_lock);
1989 hostdata->eh_complete = &complete;
1990 NCR_700_internal_bus_reset(SCp->device->host);
1992 spin_unlock_irq(SCp->device->host->host_lock);
1993 wait_for_completion(&complete);
1994 spin_lock_irq(SCp->device->host->host_lock);
1996 hostdata->eh_complete = NULL;
1997 /* Revalidate the transport parameters of the failing device */
1999 spi_schedule_dv_device(SCp->device);
2001 spin_unlock_irq(SCp->device->host->host_lock);
2006 NCR_700_host_reset(struct scsi_cmnd * SCp)
2008 scmd_printk(KERN_INFO, SCp, "New error handler wants HOST reset\n\t");
2009 scsi_print_command(SCp);
2011 spin_lock_irq(SCp->device->host->host_lock);
2013 NCR_700_internal_bus_reset(SCp->device->host);
2014 NCR_700_chip_reset(SCp->device->host);
2016 spin_unlock_irq(SCp->device->host->host_lock);
2022 NCR_700_set_period(struct scsi_target *STp, int period)
2024 struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
2025 struct NCR_700_Host_Parameters *hostdata =
2026 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
2031 if(period < hostdata->min_period)
2032 period = hostdata->min_period;
2034 spi_period(STp) = period;
2035 spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2036 NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2037 spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2041 NCR_700_set_offset(struct scsi_target *STp, int offset)
2043 struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
2044 struct NCR_700_Host_Parameters *hostdata =
2045 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
2046 int max_offset = hostdata->chip710
2047 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET;
2052 if(offset > max_offset)
2053 offset = max_offset;
2055 /* if we're currently async, make sure the period is reasonable */
2056 if(spi_offset(STp) == 0 && (spi_period(STp) < hostdata->min_period ||
2057 spi_period(STp) > 0xff))
2058 spi_period(STp) = hostdata->min_period;
2060 spi_offset(STp) = offset;
2061 spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2062 NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2063 spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2067 NCR_700_slave_alloc(struct scsi_device *SDp)
2069 SDp->hostdata = kzalloc(sizeof(struct NCR_700_Device_Parameters),
2079 NCR_700_slave_configure(struct scsi_device *SDp)
2081 struct NCR_700_Host_Parameters *hostdata =
2082 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2084 /* to do here: allocate memory; build a queue_full list */
2085 if(SDp->tagged_supported) {
2086 scsi_set_tag_type(SDp, MSG_ORDERED_TAG);
2087 scsi_activate_tcq(SDp, NCR_700_DEFAULT_TAGS);
2088 NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2090 /* initialise to default depth */
2091 scsi_adjust_queue_depth(SDp, 0, SDp->host->cmd_per_lun);
2093 if(hostdata->fast) {
2094 /* Find the correct offset and period via domain validation */
2095 if (!spi_initial_dv(SDp->sdev_target))
2098 spi_offset(SDp->sdev_target) = 0;
2099 spi_period(SDp->sdev_target) = 0;
2105 NCR_700_slave_destroy(struct scsi_device *SDp)
2107 kfree(SDp->hostdata);
2108 SDp->hostdata = NULL;
2112 NCR_700_change_queue_depth(struct scsi_device *SDp, int depth)
2114 if (depth > NCR_700_MAX_TAGS)
2115 depth = NCR_700_MAX_TAGS;
2117 scsi_adjust_queue_depth(SDp, scsi_get_tag_type(SDp), depth);
2121 static int NCR_700_change_queue_type(struct scsi_device *SDp, int tag_type)
2123 int change_tag = ((tag_type ==0 && scsi_get_tag_type(SDp) != 0)
2124 || (tag_type != 0 && scsi_get_tag_type(SDp) == 0));
2125 struct NCR_700_Host_Parameters *hostdata =
2126 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2128 scsi_set_tag_type(SDp, tag_type);
2130 /* We have a global (per target) flag to track whether TCQ is
2131 * enabled, so we'll be turning it off for the entire target here.
2132 * our tag algorithm will fail if we mix tagged and untagged commands,
2133 * so quiesce the device before doing this */
2135 scsi_target_quiesce(SDp->sdev_target);
2138 /* shift back to the default unqueued number of commands
2139 * (the user can still raise this) */
2140 scsi_deactivate_tcq(SDp, SDp->host->cmd_per_lun);
2141 hostdata->tag_negotiated &= ~(1 << sdev_id(SDp));
2143 /* Here, we cleared the negotiation flag above, so this
2144 * will force the driver to renegotiate */
2145 scsi_activate_tcq(SDp, SDp->queue_depth);
2147 NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2150 scsi_target_resume(SDp->sdev_target);
2156 NCR_700_show_active_tags(struct device *dev, struct device_attribute *attr, char *buf)
2158 struct scsi_device *SDp = to_scsi_device(dev);
2160 return snprintf(buf, 20, "%d\n", NCR_700_get_depth(SDp));
2163 static struct device_attribute NCR_700_active_tags_attr = {
2165 .name = "active_tags",
2168 .show = NCR_700_show_active_tags,
2171 STATIC struct device_attribute *NCR_700_dev_attrs[] = {
2172 &NCR_700_active_tags_attr,
2176 EXPORT_SYMBOL(NCR_700_detect);
2177 EXPORT_SYMBOL(NCR_700_release);
2178 EXPORT_SYMBOL(NCR_700_intr);
2180 static struct spi_function_template NCR_700_transport_functions = {
2181 .set_period = NCR_700_set_period,
2183 .set_offset = NCR_700_set_offset,
2187 static int __init NCR_700_init(void)
2189 NCR_700_transport_template = spi_attach_transport(&NCR_700_transport_functions);
2190 if(!NCR_700_transport_template)
2195 static void __exit NCR_700_exit(void)
2197 spi_release_transport(NCR_700_transport_template);
2200 module_init(NCR_700_init);
2201 module_exit(NCR_700_exit);
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