1 /* -*- mode: c; c-basic-offset: 8 -*- */
3 /* NCR (or Symbios) 53c700 and 53c700-66 Driver
5 * Copyright (C) 2001 by James.Bottomley@HansenPartnership.com
6 **-----------------------------------------------------------------------------
8 ** This program is free software; you can redistribute it and/or modify
9 ** it under the terms of the GNU General Public License as published by
10 ** the Free Software Foundation; either version 2 of the License, or
11 ** (at your option) any later version.
13 ** This program is distributed in the hope that it will be useful,
14 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
15 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 ** GNU General Public License for more details.
18 ** You should have received a copy of the GNU General Public License
19 ** along with this program; if not, write to the Free Software
20 ** Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 **-----------------------------------------------------------------------------
27 * This driver is designed exclusively for these chips (virtually the
28 * earliest of the scripts engine chips). They need their own drivers
29 * because they are missing so many of the scripts and snazzy register
30 * features of their elder brothers (the 710, 720 and 770).
32 * The 700 is the lowliest of the line, it can only do async SCSI.
33 * The 700-66 can at least do synchronous SCSI up to 10MHz.
35 * The 700 chip has no host bus interface logic of its own. However,
36 * it is usually mapped to a location with well defined register
37 * offsets. Therefore, if you can determine the base address and the
38 * irq your board incorporating this chip uses, you can probably use
39 * this driver to run it (although you'll probably have to write a
40 * minimal wrapper for the purpose---see the NCR_D700 driver for
41 * details about how to do this).
46 * 1. Better statistics in the proc fs
48 * 2. Implement message queue (queues SCSI messages like commands) and make
49 * the abort and device reset functions use them.
56 * Fixed bad bug affecting tag starvation processing (previously the
57 * driver would hang the system if too many tags starved. Also fixed
58 * bad bug having to do with 10 byte command processing and REQUEST
59 * SENSE (the command would loop forever getting a transfer length
60 * mismatch in the CMD phase).
64 * Fixed scripts problem which caused certain devices (notably CDRWs)
65 * to hang on initial INQUIRY. Updated NCR_700_readl/writel to use
66 * __raw_readl/writel for parisc compatibility (Thomas
67 * Bogendoerfer). Added missing SCp->request_bufflen initialisation
68 * for sense requests (Ryan Bradetich).
72 * Following test of the 64 bit parisc kernel by Richard Hirst,
73 * several problems have now been corrected. Also adds support for
74 * consistent memory allocation.
78 * More Compatibility changes for 710 (now actually works). Enhanced
79 * support for odd clock speeds which constrain SDTR negotiations.
80 * correct cacheline separation for scsi messages and status for
81 * incoherent architectures. Use of the pci mapping functions on
82 * buffers to begin support for 64 bit drivers.
86 * Added support for the 53c710 chip (in 53c700 emulation mode only---no
87 * special 53c710 instructions or registers are used).
91 * More endianness/cache coherency changes.
93 * Better bad device handling (handles devices lying about tag
94 * queueing support and devices which fail to provide sense data on
95 * contingent allegiance conditions)
97 * Many thanks to Richard Hirst <rhirst@linuxcare.com> for patiently
98 * debugging this driver on the parisc architecture and suggesting
99 * many improvements and bug fixes.
101 * Thanks also go to Linuxcare Inc. for providing several PARISC
102 * machines for me to debug the driver on.
106 * Made the driver mem or io mapped; added endian invariance; added
107 * dma cache flushing operations for architectures which need it;
108 * added support for more varied clocking speeds.
112 * Initial modularisation from the D700. See NCR_D700.c for the rest of
115 #define NCR_700_VERSION "2.8"
117 #include <linux/kernel.h>
118 #include <linux/types.h>
119 #include <linux/string.h>
120 #include <linux/ioport.h>
121 #include <linux/delay.h>
122 #include <linux/spinlock.h>
123 #include <linux/completion.h>
124 #include <linux/sched.h>
125 #include <linux/init.h>
126 #include <linux/proc_fs.h>
127 #include <linux/blkdev.h>
128 #include <linux/module.h>
129 #include <linux/interrupt.h>
130 #include <linux/device.h>
132 #include <asm/system.h>
134 #include <asm/pgtable.h>
135 #include <asm/byteorder.h>
137 #include <scsi/scsi.h>
138 #include <scsi/scsi_cmnd.h>
139 #include <scsi/scsi_dbg.h>
140 #include <scsi/scsi_eh.h>
141 #include <scsi/scsi_host.h>
142 #include <scsi/scsi_tcq.h>
143 #include <scsi/scsi_transport.h>
144 #include <scsi/scsi_transport_spi.h>
148 /* NOTE: For 64 bit drivers there are points in the code where we use
149 * a non dereferenceable pointer to point to a structure in dma-able
150 * memory (which is 32 bits) so that we can use all of the structure
151 * operations but take the address at the end. This macro allows us
152 * to truncate the 64 bit pointer down to 32 bits without the compiler
154 #define to32bit(x) ((__u32)((unsigned long)(x)))
159 #define STATIC static
162 MODULE_AUTHOR("James Bottomley");
163 MODULE_DESCRIPTION("53c700 and 53c700-66 Driver");
164 MODULE_LICENSE("GPL");
166 /* This is the script */
167 #include "53c700_d.h"
170 STATIC int NCR_700_queuecommand(struct scsi_cmnd *, void (*done)(struct scsi_cmnd *));
171 STATIC int NCR_700_abort(struct scsi_cmnd * SCpnt);
172 STATIC int NCR_700_bus_reset(struct scsi_cmnd * SCpnt);
173 STATIC int NCR_700_host_reset(struct scsi_cmnd * SCpnt);
174 STATIC void NCR_700_chip_setup(struct Scsi_Host *host);
175 STATIC void NCR_700_chip_reset(struct Scsi_Host *host);
176 STATIC int NCR_700_slave_alloc(struct scsi_device *SDpnt);
177 STATIC int NCR_700_slave_configure(struct scsi_device *SDpnt);
178 STATIC void NCR_700_slave_destroy(struct scsi_device *SDpnt);
179 static int NCR_700_change_queue_depth(struct scsi_device *SDpnt, int depth);
180 static int NCR_700_change_queue_type(struct scsi_device *SDpnt, int depth);
182 STATIC struct device_attribute *NCR_700_dev_attrs[];
184 STATIC struct scsi_transport_template *NCR_700_transport_template = NULL;
186 static char *NCR_700_phase[] = {
189 "before command phase",
190 "after command phase",
191 "after status phase",
192 "after data in phase",
193 "after data out phase",
197 static char *NCR_700_condition[] = {
205 "REJECT_MSG RECEIVED",
206 "DISCONNECT_MSG RECEIVED",
212 static char *NCR_700_fatal_messages[] = {
213 "unexpected message after reselection",
214 "still MSG_OUT after message injection",
215 "not MSG_IN after selection",
216 "Illegal message length received",
219 static char *NCR_700_SBCL_bits[] = {
230 static char *NCR_700_SBCL_to_phase[] = {
241 /* This translates the SDTR message offset and period to a value
242 * which can be loaded into the SXFER_REG.
244 * NOTE: According to SCSI-2, the true transfer period (in ns) is
245 * actually four times this period value */
247 NCR_700_offset_period_to_sxfer(struct NCR_700_Host_Parameters *hostdata,
248 __u8 offset, __u8 period)
252 __u8 min_xferp = (hostdata->chip710
253 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
254 __u8 max_offset = (hostdata->chip710
255 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET);
260 if(period < hostdata->min_period) {
261 printk(KERN_WARNING "53c700: Period %dns is less than this chip's minimum, setting to %d\n", period*4, NCR_700_MIN_PERIOD*4);
262 period = hostdata->min_period;
264 XFERP = (period*4 * hostdata->sync_clock)/1000 - 4;
265 if(offset > max_offset) {
266 printk(KERN_WARNING "53c700: Offset %d exceeds chip maximum, setting to %d\n",
270 if(XFERP < min_xferp) {
271 printk(KERN_WARNING "53c700: XFERP %d is less than minium, setting to %d\n",
275 return (offset & 0x0f) | (XFERP & 0x07)<<4;
279 NCR_700_get_SXFER(struct scsi_device *SDp)
281 struct NCR_700_Host_Parameters *hostdata =
282 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
284 return NCR_700_offset_period_to_sxfer(hostdata,
285 spi_offset(SDp->sdev_target),
286 spi_period(SDp->sdev_target));
290 NCR_700_detect(struct scsi_host_template *tpnt,
291 struct NCR_700_Host_Parameters *hostdata, struct device *dev)
293 dma_addr_t pScript, pSlots;
296 struct Scsi_Host *host;
297 static int banner = 0;
300 if(tpnt->sdev_attrs == NULL)
301 tpnt->sdev_attrs = NCR_700_dev_attrs;
303 memory = dma_alloc_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
304 &pScript, GFP_KERNEL);
306 printk(KERN_ERR "53c700: Failed to allocate memory for driver, detatching\n");
310 script = (__u32 *)memory;
311 hostdata->msgin = memory + MSGIN_OFFSET;
312 hostdata->msgout = memory + MSGOUT_OFFSET;
313 hostdata->status = memory + STATUS_OFFSET;
314 /* all of these offsets are L1_CACHE_BYTES separated. It is fatal
315 * if this isn't sufficient separation to avoid dma flushing issues */
316 BUG_ON(!dma_is_consistent(pScript) && L1_CACHE_BYTES < dma_get_cache_alignment());
317 hostdata->slots = (struct NCR_700_command_slot *)(memory + SLOTS_OFFSET);
320 pSlots = pScript + SLOTS_OFFSET;
322 /* Fill in the missing routines from the host template */
323 tpnt->queuecommand = NCR_700_queuecommand;
324 tpnt->eh_abort_handler = NCR_700_abort;
325 tpnt->eh_bus_reset_handler = NCR_700_bus_reset;
326 tpnt->eh_host_reset_handler = NCR_700_host_reset;
327 tpnt->can_queue = NCR_700_COMMAND_SLOTS_PER_HOST;
328 tpnt->sg_tablesize = NCR_700_SG_SEGMENTS;
329 tpnt->cmd_per_lun = NCR_700_CMD_PER_LUN;
330 tpnt->use_clustering = ENABLE_CLUSTERING;
331 tpnt->slave_configure = NCR_700_slave_configure;
332 tpnt->slave_destroy = NCR_700_slave_destroy;
333 tpnt->slave_alloc = NCR_700_slave_alloc;
334 tpnt->change_queue_depth = NCR_700_change_queue_depth;
335 tpnt->change_queue_type = NCR_700_change_queue_type;
337 if(tpnt->name == NULL)
338 tpnt->name = "53c700";
339 if(tpnt->proc_name == NULL)
340 tpnt->proc_name = "53c700";
342 host = scsi_host_alloc(tpnt, 4);
345 memset(hostdata->slots, 0, sizeof(struct NCR_700_command_slot)
346 * NCR_700_COMMAND_SLOTS_PER_HOST);
347 for (j = 0; j < NCR_700_COMMAND_SLOTS_PER_HOST; j++) {
348 dma_addr_t offset = (dma_addr_t)((unsigned long)&hostdata->slots[j].SG[0]
349 - (unsigned long)&hostdata->slots[0].SG[0]);
350 hostdata->slots[j].pSG = (struct NCR_700_SG_List *)((unsigned long)(pSlots + offset));
352 hostdata->free_list = &hostdata->slots[j];
354 hostdata->slots[j-1].ITL_forw = &hostdata->slots[j];
355 hostdata->slots[j].state = NCR_700_SLOT_FREE;
358 for (j = 0; j < ARRAY_SIZE(SCRIPT); j++)
359 script[j] = bS_to_host(SCRIPT[j]);
361 /* adjust all labels to be bus physical */
362 for (j = 0; j < PATCHES; j++)
363 script[LABELPATCHES[j]] = bS_to_host(pScript + SCRIPT[LABELPATCHES[j]]);
364 /* now patch up fixed addresses. */
365 script_patch_32(script, MessageLocation,
366 pScript + MSGOUT_OFFSET);
367 script_patch_32(script, StatusAddress,
368 pScript + STATUS_OFFSET);
369 script_patch_32(script, ReceiveMsgAddress,
370 pScript + MSGIN_OFFSET);
372 hostdata->script = script;
373 hostdata->pScript = pScript;
374 dma_sync_single_for_device(hostdata->dev, pScript, sizeof(SCRIPT), DMA_TO_DEVICE);
375 hostdata->state = NCR_700_HOST_FREE;
376 hostdata->cmd = NULL;
378 host->max_lun = NCR_700_MAX_LUNS;
379 BUG_ON(NCR_700_transport_template == NULL);
380 host->transportt = NCR_700_transport_template;
381 host->unique_id = (unsigned long)hostdata->base;
382 hostdata->eh_complete = NULL;
383 host->hostdata[0] = (unsigned long)hostdata;
385 NCR_700_writeb(0xff, host, CTEST9_REG);
386 if (hostdata->chip710)
387 hostdata->rev = (NCR_700_readb(host, CTEST8_REG)>>4) & 0x0f;
389 hostdata->rev = (NCR_700_readb(host, CTEST7_REG)>>4) & 0x0f;
390 hostdata->fast = (NCR_700_readb(host, CTEST9_REG) == 0);
392 printk(KERN_NOTICE "53c700: Version " NCR_700_VERSION " By James.Bottomley@HansenPartnership.com\n");
395 printk(KERN_NOTICE "scsi%d: %s rev %d %s\n", host->host_no,
396 hostdata->chip710 ? "53c710" :
397 (hostdata->fast ? "53c700-66" : "53c700"),
398 hostdata->rev, hostdata->differential ?
399 "(Differential)" : "");
401 NCR_700_chip_reset(host);
403 if (scsi_add_host(host, dev)) {
404 dev_printk(KERN_ERR, dev, "53c700: scsi_add_host failed\n");
409 spi_signalling(host) = hostdata->differential ? SPI_SIGNAL_HVD :
416 NCR_700_release(struct Scsi_Host *host)
418 struct NCR_700_Host_Parameters *hostdata =
419 (struct NCR_700_Host_Parameters *)host->hostdata[0];
421 dma_free_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
422 hostdata->script, hostdata->pScript);
427 NCR_700_identify(int can_disconnect, __u8 lun)
429 return IDENTIFY_BASE |
430 ((can_disconnect) ? 0x40 : 0) |
431 (lun & NCR_700_LUN_MASK);
435 * Function : static int data_residual (Scsi_Host *host)
437 * Purpose : return residual data count of what's in the chip. If you
438 * really want to know what this function is doing, it's almost a
439 * direct transcription of the algorithm described in the 53c710
440 * guide, except that the DBC and DFIFO registers are only 6 bits
443 * Inputs : host - SCSI host */
445 NCR_700_data_residual (struct Scsi_Host *host) {
446 struct NCR_700_Host_Parameters *hostdata =
447 (struct NCR_700_Host_Parameters *)host->hostdata[0];
448 int count, synchronous = 0;
451 if(hostdata->chip710) {
452 count = ((NCR_700_readb(host, DFIFO_REG) & 0x7f) -
453 (NCR_700_readl(host, DBC_REG) & 0x7f)) & 0x7f;
455 count = ((NCR_700_readb(host, DFIFO_REG) & 0x3f) -
456 (NCR_700_readl(host, DBC_REG) & 0x3f)) & 0x3f;
460 synchronous = NCR_700_readb(host, SXFER_REG) & 0x0f;
462 /* get the data direction */
463 ddir = NCR_700_readb(host, CTEST0_REG) & 0x01;
468 count += (NCR_700_readb(host, SSTAT2_REG) & 0xf0) >> 4;
470 if (NCR_700_readb(host, SSTAT1_REG) & SIDL_REG_FULL)
474 __u8 sstat = NCR_700_readb(host, SSTAT1_REG);
475 if (sstat & SODL_REG_FULL)
477 if (synchronous && (sstat & SODR_REG_FULL))
482 printk("RESIDUAL IS %d (ddir %d)\n", count, ddir);
487 /* print out the SCSI wires and corresponding phase from the SBCL register
490 sbcl_to_string(__u8 sbcl)
493 static char ret[256];
498 strcat(ret, NCR_700_SBCL_bits[i]);
500 strcat(ret, NCR_700_SBCL_to_phase[sbcl & 0x07]);
505 bitmap_to_number(__u8 bitmap)
509 for(i=0; i<8 && !(bitmap &(1<<i)); i++)
514 /* Pull a slot off the free list */
515 STATIC struct NCR_700_command_slot *
516 find_empty_slot(struct NCR_700_Host_Parameters *hostdata)
518 struct NCR_700_command_slot *slot = hostdata->free_list;
522 if(hostdata->command_slot_count != NCR_700_COMMAND_SLOTS_PER_HOST)
523 printk(KERN_ERR "SLOTS FULL, but count is %d, should be %d\n", hostdata->command_slot_count, NCR_700_COMMAND_SLOTS_PER_HOST);
527 if(slot->state != NCR_700_SLOT_FREE)
529 printk(KERN_ERR "BUSY SLOT ON FREE LIST!!!\n");
532 hostdata->free_list = slot->ITL_forw;
533 slot->ITL_forw = NULL;
536 /* NOTE: set the state to busy here, not queued, since this
537 * indicates the slot is in use and cannot be run by the IRQ
538 * finish routine. If we cannot queue the command when it
539 * is properly build, we then change to NCR_700_SLOT_QUEUED */
540 slot->state = NCR_700_SLOT_BUSY;
542 hostdata->command_slot_count++;
548 free_slot(struct NCR_700_command_slot *slot,
549 struct NCR_700_Host_Parameters *hostdata)
551 if((slot->state & NCR_700_SLOT_MASK) != NCR_700_SLOT_MAGIC) {
552 printk(KERN_ERR "53c700: SLOT %p is not MAGIC!!!\n", slot);
554 if(slot->state == NCR_700_SLOT_FREE) {
555 printk(KERN_ERR "53c700: SLOT %p is FREE!!!\n", slot);
558 slot->resume_offset = 0;
560 slot->state = NCR_700_SLOT_FREE;
561 slot->ITL_forw = hostdata->free_list;
562 hostdata->free_list = slot;
563 hostdata->command_slot_count--;
567 /* This routine really does very little. The command is indexed on
568 the ITL and (if tagged) the ITLQ lists in _queuecommand */
570 save_for_reselection(struct NCR_700_Host_Parameters *hostdata,
571 struct scsi_cmnd *SCp, __u32 dsp)
573 /* Its just possible that this gets executed twice */
575 struct NCR_700_command_slot *slot =
576 (struct NCR_700_command_slot *)SCp->host_scribble;
578 slot->resume_offset = dsp;
580 hostdata->state = NCR_700_HOST_FREE;
581 hostdata->cmd = NULL;
585 NCR_700_unmap(struct NCR_700_Host_Parameters *hostdata, struct scsi_cmnd *SCp,
586 struct NCR_700_command_slot *slot)
588 if(SCp->sc_data_direction != DMA_NONE &&
589 SCp->sc_data_direction != DMA_BIDIRECTIONAL) {
591 dma_unmap_sg(hostdata->dev, SCp->request_buffer,
592 SCp->use_sg, SCp->sc_data_direction);
594 dma_unmap_single(hostdata->dev, slot->dma_handle,
595 SCp->request_bufflen,
596 SCp->sc_data_direction);
602 NCR_700_scsi_done(struct NCR_700_Host_Parameters *hostdata,
603 struct scsi_cmnd *SCp, int result)
605 hostdata->state = NCR_700_HOST_FREE;
606 hostdata->cmd = NULL;
609 struct NCR_700_command_slot *slot =
610 (struct NCR_700_command_slot *)SCp->host_scribble;
612 dma_unmap_single(hostdata->dev, slot->pCmd,
613 sizeof(SCp->cmnd), DMA_TO_DEVICE);
614 if (slot->flags == NCR_700_FLAG_AUTOSENSE) {
615 char *cmnd = NCR_700_get_sense_cmnd(SCp->device);
617 printk(" ORIGINAL CMD %p RETURNED %d, new return is %d sense is\n",
618 SCp, SCp->cmnd[7], result);
619 scsi_print_sense("53c700", SCp);
622 dma_unmap_single(hostdata->dev, slot->dma_handle, sizeof(SCp->sense_buffer), DMA_FROM_DEVICE);
623 /* restore the old result if the request sense was
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 = hostdata->burst_disable
672 dcntl_extra = COMPAT_700_MODE;
674 NCR_700_writeb(dcntl_extra, host, DCNTL_REG);
675 NCR_700_writeb(BURST_LENGTH_8 | hostdata->dmode_extra,
676 host, DMODE_710_REG);
677 NCR_700_writeb(burst_disable | (hostdata->differential ?
678 DIFF : 0), host, CTEST7_REG);
679 NCR_700_writeb(BTB_TIMER_DISABLE, host, CTEST0_REG);
680 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY | PARITY
681 | AUTO_ATN, host, SCNTL0_REG);
683 NCR_700_writeb(BURST_LENGTH_8 | hostdata->dmode_extra,
684 host, DMODE_700_REG);
685 NCR_700_writeb(hostdata->differential ?
686 DIFF : 0, host, CTEST7_REG);
688 /* this is for 700-66, does nothing on 700 */
689 NCR_700_writeb(LAST_DIS_ENBL | ENABLE_ACTIVE_NEGATION
690 | GENERATE_RECEIVE_PARITY, host,
693 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY
694 | PARITY | AUTO_ATN, host, SCNTL0_REG);
698 NCR_700_writeb(1 << host->this_id, host, SCID_REG);
699 NCR_700_writeb(0, host, SBCL_REG);
700 NCR_700_writeb(ASYNC_OPERATION, host, SXFER_REG);
702 NCR_700_writeb(PHASE_MM_INT | SEL_TIMEOUT_INT | GROSS_ERR_INT | UX_DISC_INT
703 | RST_INT | PAR_ERR_INT | SELECT_INT, host, SIEN_REG);
705 NCR_700_writeb(ABORT_INT | INT_INST_INT | ILGL_INST_INT, host, DIEN_REG);
706 NCR_700_writeb(ENABLE_SELECT, host, SCNTL1_REG);
707 if(hostdata->clock > 75) {
708 printk(KERN_ERR "53c700: Clock speed %dMHz is too high: 75Mhz is the maximum this chip can be driven at\n", hostdata->clock);
709 /* do the best we can, but the async clock will be out
710 * of spec: sync divider 2, async divider 3 */
711 DEBUG(("53c700: sync 2 async 3\n"));
712 NCR_700_writeb(SYNC_DIV_2_0, host, SBCL_REG);
713 NCR_700_writeb(ASYNC_DIV_3_0 | dcntl_extra, host, DCNTL_REG);
714 hostdata->sync_clock = hostdata->clock/2;
715 } else if(hostdata->clock > 50 && hostdata->clock <= 75) {
716 /* sync divider 1.5, async divider 3 */
717 DEBUG(("53c700: sync 1.5 async 3\n"));
718 NCR_700_writeb(SYNC_DIV_1_5, host, SBCL_REG);
719 NCR_700_writeb(ASYNC_DIV_3_0 | dcntl_extra, host, DCNTL_REG);
720 hostdata->sync_clock = hostdata->clock*2;
721 hostdata->sync_clock /= 3;
723 } else if(hostdata->clock > 37 && hostdata->clock <= 50) {
724 /* sync divider 1, async divider 2 */
725 DEBUG(("53c700: sync 1 async 2\n"));
726 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
727 NCR_700_writeb(ASYNC_DIV_2_0 | dcntl_extra, host, DCNTL_REG);
728 hostdata->sync_clock = hostdata->clock;
729 } else if(hostdata->clock > 25 && hostdata->clock <=37) {
730 /* sync divider 1, async divider 1.5 */
731 DEBUG(("53c700: sync 1 async 1.5\n"));
732 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
733 NCR_700_writeb(ASYNC_DIV_1_5 | dcntl_extra, host, DCNTL_REG);
734 hostdata->sync_clock = hostdata->clock;
736 DEBUG(("53c700: sync 1 async 1\n"));
737 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
738 NCR_700_writeb(ASYNC_DIV_1_0 | dcntl_extra, host, DCNTL_REG);
739 /* sync divider 1, async divider 1 */
740 hostdata->sync_clock = hostdata->clock;
742 /* Calculate the actual minimum period that can be supported
743 * by our synchronous clock speed. See the 710 manual for
744 * exact details of this calculation which is based on a
745 * setting of the SXFER register */
746 min_period = 1000*(4+min_xferp)/(4*hostdata->sync_clock);
747 hostdata->min_period = NCR_700_MIN_PERIOD;
748 if(min_period > NCR_700_MIN_PERIOD)
749 hostdata->min_period = min_period;
753 NCR_700_chip_reset(struct Scsi_Host *host)
755 struct NCR_700_Host_Parameters *hostdata =
756 (struct NCR_700_Host_Parameters *)host->hostdata[0];
757 if(hostdata->chip710) {
758 NCR_700_writeb(SOFTWARE_RESET_710, host, ISTAT_REG);
761 NCR_700_writeb(0, host, ISTAT_REG);
763 NCR_700_writeb(SOFTWARE_RESET, host, DCNTL_REG);
766 NCR_700_writeb(0, host, DCNTL_REG);
771 NCR_700_chip_setup(host);
774 /* The heart of the message processing engine is that the instruction
775 * immediately after the INT is the normal case (and so must be CLEAR
776 * ACK). If we want to do something else, we call that routine in
777 * scripts and set temp to be the normal case + 8 (skipping the CLEAR
778 * ACK) so that the routine returns correctly to resume its activity
781 process_extended_message(struct Scsi_Host *host,
782 struct NCR_700_Host_Parameters *hostdata,
783 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
785 __u32 resume_offset = dsp, temp = dsp + 8;
786 __u8 pun = 0xff, lun = 0xff;
789 pun = SCp->device->id;
790 lun = SCp->device->lun;
793 switch(hostdata->msgin[2]) {
795 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
796 struct scsi_target *starget = SCp->device->sdev_target;
797 __u8 period = hostdata->msgin[3];
798 __u8 offset = hostdata->msgin[4];
800 if(offset == 0 || period == 0) {
805 spi_offset(starget) = offset;
806 spi_period(starget) = period;
808 if(NCR_700_is_flag_set(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION)) {
809 spi_display_xfer_agreement(starget);
810 NCR_700_clear_flag(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION);
813 NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
814 NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
816 NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
820 /* SDTR message out of the blue, reject it */
821 shost_printk(KERN_WARNING, host,
822 "Unexpected SDTR msg\n");
823 hostdata->msgout[0] = A_REJECT_MSG;
824 dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
825 script_patch_16(hostdata->script, MessageCount, 1);
826 /* SendMsgOut returns, so set up the return
828 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
833 printk(KERN_INFO "scsi%d: (%d:%d), Unsolicited WDTR after CMD, Rejecting\n",
834 host->host_no, pun, lun);
835 hostdata->msgout[0] = A_REJECT_MSG;
836 dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
837 script_patch_16(hostdata->script, MessageCount, 1);
838 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
843 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
844 host->host_no, pun, lun,
845 NCR_700_phase[(dsps & 0xf00) >> 8]);
846 spi_print_msg(hostdata->msgin);
849 hostdata->msgout[0] = A_REJECT_MSG;
850 dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
851 script_patch_16(hostdata->script, MessageCount, 1);
852 /* SendMsgOut returns, so set up the return
854 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
856 NCR_700_writel(temp, host, TEMP_REG);
857 return resume_offset;
861 process_message(struct Scsi_Host *host, struct NCR_700_Host_Parameters *hostdata,
862 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
864 /* work out where to return to */
865 __u32 temp = dsp + 8, resume_offset = dsp;
866 __u8 pun = 0xff, lun = 0xff;
869 pun = SCp->device->id;
870 lun = SCp->device->lun;
874 printk("scsi%d (%d:%d): message %s: ", host->host_no, pun, lun,
875 NCR_700_phase[(dsps & 0xf00) >> 8]);
876 spi_print_msg(hostdata->msgin);
880 switch(hostdata->msgin[0]) {
883 resume_offset = process_extended_message(host, hostdata, SCp,
888 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
889 /* Rejected our sync negotiation attempt */
890 spi_period(SCp->device->sdev_target) =
891 spi_offset(SCp->device->sdev_target) = 0;
892 NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
893 NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
894 } else if(SCp != NULL && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION) {
895 /* rejected our first simple tag message */
896 scmd_printk(KERN_WARNING, SCp,
897 "Rejected first tag queue attempt, turning off tag queueing\n");
898 /* we're done negotiating */
899 NCR_700_set_tag_neg_state(SCp->device, NCR_700_FINISHED_TAG_NEGOTIATION);
900 hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
901 SCp->device->tagged_supported = 0;
902 scsi_deactivate_tcq(SCp->device, host->cmd_per_lun);
904 shost_printk(KERN_WARNING, host,
905 "(%d:%d) Unexpected REJECT Message %s\n",
907 NCR_700_phase[(dsps & 0xf00) >> 8]);
908 /* however, just ignore it */
912 case A_PARITY_ERROR_MSG:
913 printk(KERN_ERR "scsi%d (%d:%d) Parity Error!\n", host->host_no,
915 NCR_700_internal_bus_reset(host);
917 case A_SIMPLE_TAG_MSG:
918 printk(KERN_INFO "scsi%d (%d:%d) SIMPLE TAG %d %s\n", host->host_no,
919 pun, lun, hostdata->msgin[1],
920 NCR_700_phase[(dsps & 0xf00) >> 8]);
924 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
925 host->host_no, pun, lun,
926 NCR_700_phase[(dsps & 0xf00) >> 8]);
928 spi_print_msg(hostdata->msgin);
931 hostdata->msgout[0] = A_REJECT_MSG;
932 dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
933 script_patch_16(hostdata->script, MessageCount, 1);
934 /* SendMsgOut returns, so set up the return
936 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
940 NCR_700_writel(temp, host, TEMP_REG);
941 /* set us up to receive another message */
942 dma_cache_sync(hostdata->msgin, MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
943 return resume_offset;
947 process_script_interrupt(__u32 dsps, __u32 dsp, struct scsi_cmnd *SCp,
948 struct Scsi_Host *host,
949 struct NCR_700_Host_Parameters *hostdata)
951 __u32 resume_offset = 0;
952 __u8 pun = 0xff, lun=0xff;
955 pun = SCp->device->id;
956 lun = SCp->device->lun;
959 if(dsps == A_GOOD_STATUS_AFTER_STATUS) {
960 DEBUG((" COMMAND COMPLETE, status=%02x\n",
961 hostdata->status[0]));
962 /* OK, if TCQ still under negotiation, we now know it works */
963 if (NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION)
964 NCR_700_set_tag_neg_state(SCp->device,
965 NCR_700_FINISHED_TAG_NEGOTIATION);
967 /* check for contingent allegiance contitions */
968 if(status_byte(hostdata->status[0]) == CHECK_CONDITION ||
969 status_byte(hostdata->status[0]) == COMMAND_TERMINATED) {
970 struct NCR_700_command_slot *slot =
971 (struct NCR_700_command_slot *)SCp->host_scribble;
972 if(slot->flags == NCR_700_FLAG_AUTOSENSE) {
973 /* OOPS: bad device, returning another
974 * contingent allegiance condition */
975 scmd_printk(KERN_ERR, SCp,
976 "broken device is looping in contingent allegiance: ignoring\n");
977 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
980 NCR_700_get_sense_cmnd(SCp->device);
982 scsi_print_command(SCp);
983 printk(" cmd %p has status %d, requesting sense\n",
984 SCp, hostdata->status[0]);
986 /* we can destroy the command here
987 * because the contingent allegiance
988 * condition will cause a retry which
989 * will re-copy the command from the
990 * saved data_cmnd. We also unmap any
991 * data associated with the command
993 NCR_700_unmap(hostdata, SCp, slot);
994 dma_unmap_single(hostdata->dev, slot->pCmd,
998 cmnd[0] = REQUEST_SENSE;
999 cmnd[1] = (SCp->device->lun & 0x7) << 5;
1002 cmnd[4] = sizeof(SCp->sense_buffer);
1004 /* Here's a quiet hack: the
1005 * REQUEST_SENSE command is six bytes,
1006 * so store a flag indicating that
1007 * this was an internal sense request
1008 * and the original status at the end
1010 cmnd[6] = NCR_700_INTERNAL_SENSE_MAGIC;
1011 cmnd[7] = hostdata->status[0];
1012 cmnd[8] = SCp->cmd_len;
1013 SCp->cmd_len = 6; /* command length for
1015 slot->pCmd = dma_map_single(hostdata->dev, cmnd, MAX_COMMAND_SIZE, DMA_TO_DEVICE);
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 slot->flags = NCR_700_FLAG_AUTOSENSE;
1028 hostdata->state = NCR_700_HOST_FREE;
1029 hostdata->cmd = NULL;
1032 // Currently rely on the mid layer evaluation
1033 // of the tag queuing capability
1035 //if(status_byte(hostdata->status[0]) == GOOD &&
1036 // SCp->cmnd[0] == INQUIRY && SCp->use_sg == 0) {
1037 // /* Piggy back the tag queueing support
1038 // * on this command */
1039 // dma_sync_single_for_cpu(hostdata->dev,
1040 // slot->dma_handle,
1041 // SCp->request_bufflen,
1042 // DMA_FROM_DEVICE);
1043 // if(((char *)SCp->request_buffer)[7] & 0x02) {
1044 // scmd_printk(KERN_INFO, SCp,
1045 // "Enabling Tag Command Queuing\n");
1046 // hostdata->tag_negotiated |= (1<<scmd_id(SCp));
1047 // NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1049 // NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1050 // hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
1053 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
1055 } else if((dsps & 0xfffff0f0) == A_UNEXPECTED_PHASE) {
1056 __u8 i = (dsps & 0xf00) >> 8;
1058 scmd_printk(KERN_ERR, SCp, "UNEXPECTED PHASE %s (%s)\n",
1060 sbcl_to_string(NCR_700_readb(host, SBCL_REG)));
1061 scmd_printk(KERN_ERR, SCp, " len = %d, cmd =",
1063 scsi_print_command(SCp);
1065 NCR_700_internal_bus_reset(host);
1066 } else if((dsps & 0xfffff000) == A_FATAL) {
1067 int i = (dsps & 0xfff);
1069 printk(KERN_ERR "scsi%d: (%d:%d) FATAL ERROR: %s\n",
1070 host->host_no, pun, lun, NCR_700_fatal_messages[i]);
1071 if(dsps == A_FATAL_ILLEGAL_MSG_LENGTH) {
1072 printk(KERN_ERR " msg begins %02x %02x\n",
1073 hostdata->msgin[0], hostdata->msgin[1]);
1075 NCR_700_internal_bus_reset(host);
1076 } else if((dsps & 0xfffff0f0) == A_DISCONNECT) {
1077 #ifdef NCR_700_DEBUG
1078 __u8 i = (dsps & 0xf00) >> 8;
1080 printk("scsi%d: (%d:%d), DISCONNECTED (%d) %s\n",
1081 host->host_no, pun, lun,
1082 i, NCR_700_phase[i]);
1084 save_for_reselection(hostdata, SCp, dsp);
1086 } else if(dsps == A_RESELECTION_IDENTIFIED) {
1088 struct NCR_700_command_slot *slot;
1089 __u8 reselection_id = hostdata->reselection_id;
1090 struct scsi_device *SDp;
1092 lun = hostdata->msgin[0] & 0x1f;
1094 hostdata->reselection_id = 0xff;
1095 DEBUG(("scsi%d: (%d:%d) RESELECTED!\n",
1096 host->host_no, reselection_id, lun));
1097 /* clear the reselection indicator */
1098 SDp = __scsi_device_lookup(host, 0, reselection_id, lun);
1099 if(unlikely(SDp == NULL)) {
1100 printk(KERN_ERR "scsi%d: (%d:%d) HAS NO device\n",
1101 host->host_no, reselection_id, lun);
1104 if(hostdata->msgin[1] == A_SIMPLE_TAG_MSG) {
1105 struct scsi_cmnd *SCp = scsi_find_tag(SDp, hostdata->msgin[2]);
1106 if(unlikely(SCp == NULL)) {
1107 printk(KERN_ERR "scsi%d: (%d:%d) no saved request for tag %d\n",
1108 host->host_no, reselection_id, lun, hostdata->msgin[2]);
1112 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1113 DDEBUG(KERN_DEBUG, SDp,
1114 "reselection is tag %d, slot %p(%d)\n",
1115 hostdata->msgin[2], slot, slot->tag);
1117 struct scsi_cmnd *SCp = scsi_find_tag(SDp, SCSI_NO_TAG);
1118 if(unlikely(SCp == NULL)) {
1119 sdev_printk(KERN_ERR, SDp,
1120 "no saved request for untagged cmd\n");
1123 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1127 printk(KERN_ERR "scsi%d: (%d:%d) RESELECTED but no saved command (MSG = %02x %02x %02x)!!\n",
1128 host->host_no, reselection_id, lun,
1129 hostdata->msgin[0], hostdata->msgin[1],
1130 hostdata->msgin[2]);
1132 if(hostdata->state != NCR_700_HOST_BUSY)
1133 printk(KERN_ERR "scsi%d: FATAL, host not busy during valid reselection!\n",
1135 resume_offset = slot->resume_offset;
1136 hostdata->cmd = slot->cmnd;
1138 /* re-patch for this command */
1139 script_patch_32_abs(hostdata->script, CommandAddress,
1141 script_patch_16(hostdata->script,
1142 CommandCount, slot->cmnd->cmd_len);
1143 script_patch_32_abs(hostdata->script, SGScriptStartAddress,
1144 to32bit(&slot->pSG[0].ins));
1146 /* Note: setting SXFER only works if we're
1147 * still in the MESSAGE phase, so it is vital
1148 * that ACK is still asserted when we process
1149 * the reselection message. The resume offset
1150 * should therefore always clear ACK */
1151 NCR_700_writeb(NCR_700_get_SXFER(hostdata->cmd->device),
1153 dma_cache_sync(hostdata->msgin,
1154 MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
1155 dma_cache_sync(hostdata->msgout,
1156 MSG_ARRAY_SIZE, DMA_TO_DEVICE);
1157 /* I'm just being paranoid here, the command should
1158 * already have been flushed from the cache */
1159 dma_cache_sync(slot->cmnd->cmnd,
1160 slot->cmnd->cmd_len, DMA_TO_DEVICE);
1165 } else if(dsps == A_RESELECTED_DURING_SELECTION) {
1167 /* This section is full of debugging code because I've
1168 * never managed to reach it. I think what happens is
1169 * that, because the 700 runs with selection
1170 * interrupts enabled the whole time that we take a
1171 * selection interrupt before we manage to get to the
1172 * reselected script interrupt */
1174 __u8 reselection_id = NCR_700_readb(host, SFBR_REG);
1175 struct NCR_700_command_slot *slot;
1177 /* Take out our own ID */
1178 reselection_id &= ~(1<<host->this_id);
1180 /* I've never seen this happen, so keep this as a printk rather
1182 printk(KERN_INFO "scsi%d: (%d:%d) RESELECTION DURING SELECTION, dsp=%08x[%04x] state=%d, count=%d\n",
1183 host->host_no, reselection_id, lun, dsp, dsp - hostdata->pScript, hostdata->state, hostdata->command_slot_count);
1186 /* FIXME: DEBUGGING CODE */
1187 __u32 SG = (__u32)bS_to_cpu(hostdata->script[A_SGScriptStartAddress_used[0]]);
1190 for(i=0; i< NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1191 if(SG >= to32bit(&hostdata->slots[i].pSG[0])
1192 && SG <= to32bit(&hostdata->slots[i].pSG[NCR_700_SG_SEGMENTS]))
1195 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);
1196 SCp = hostdata->slots[i].cmnd;
1200 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1201 /* change slot from busy to queued to redo command */
1202 slot->state = NCR_700_SLOT_QUEUED;
1204 hostdata->cmd = NULL;
1206 if(reselection_id == 0) {
1207 if(hostdata->reselection_id == 0xff) {
1208 printk(KERN_ERR "scsi%d: Invalid reselection during selection!!\n", host->host_no);
1211 printk(KERN_ERR "scsi%d: script reselected and we took a selection interrupt\n",
1213 reselection_id = hostdata->reselection_id;
1217 /* convert to real ID */
1218 reselection_id = bitmap_to_number(reselection_id);
1220 hostdata->reselection_id = reselection_id;
1221 /* just in case we have a stale simple tag message, clear it */
1222 hostdata->msgin[1] = 0;
1223 dma_cache_sync(hostdata->msgin,
1224 MSG_ARRAY_SIZE, DMA_BIDIRECTIONAL);
1225 if(hostdata->tag_negotiated & (1<<reselection_id)) {
1226 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1228 resume_offset = hostdata->pScript + Ent_GetReselectionData;
1230 } else if(dsps == A_COMPLETED_SELECTION_AS_TARGET) {
1231 /* we've just disconnected from the bus, do nothing since
1232 * a return here will re-run the queued command slot
1233 * that may have been interrupted by the initial selection */
1234 DEBUG((" SELECTION COMPLETED\n"));
1235 } else if((dsps & 0xfffff0f0) == A_MSG_IN) {
1236 resume_offset = process_message(host, hostdata, SCp,
1238 } else if((dsps & 0xfffff000) == 0) {
1239 __u8 i = (dsps & 0xf0) >> 4, j = (dsps & 0xf00) >> 8;
1240 printk(KERN_ERR "scsi%d: (%d:%d), unhandled script condition %s %s at %04x\n",
1241 host->host_no, pun, lun, NCR_700_condition[i],
1242 NCR_700_phase[j], dsp - hostdata->pScript);
1244 scsi_print_command(SCp);
1247 for(i = 0; i < SCp->use_sg + 1; i++) {
1248 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);
1252 NCR_700_internal_bus_reset(host);
1253 } else if((dsps & 0xfffff000) == A_DEBUG_INTERRUPT) {
1254 printk(KERN_NOTICE "scsi%d (%d:%d) DEBUG INTERRUPT %d AT %08x[%04x], continuing\n",
1255 host->host_no, pun, lun, dsps & 0xfff, dsp, dsp - hostdata->pScript);
1256 resume_offset = dsp;
1258 printk(KERN_ERR "scsi%d: (%d:%d), unidentified script interrupt 0x%x at %04x\n",
1259 host->host_no, pun, lun, dsps, dsp - hostdata->pScript);
1260 NCR_700_internal_bus_reset(host);
1262 return resume_offset;
1265 /* We run the 53c700 with selection interrupts always enabled. This
1266 * means that the chip may be selected as soon as the bus frees. On a
1267 * busy bus, this can be before the scripts engine finishes its
1268 * processing. Therefore, part of the selection processing has to be
1269 * to find out what the scripts engine is doing and complete the
1270 * function if necessary (i.e. process the pending disconnect or save
1271 * the interrupted initial selection */
1273 process_selection(struct Scsi_Host *host, __u32 dsp)
1275 __u8 id = 0; /* Squash compiler warning */
1277 __u32 resume_offset = 0;
1278 struct NCR_700_Host_Parameters *hostdata =
1279 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1280 struct scsi_cmnd *SCp = hostdata->cmd;
1283 for(count = 0; count < 5; count++) {
1284 id = NCR_700_readb(host, hostdata->chip710 ?
1285 CTEST9_REG : SFBR_REG);
1287 /* Take out our own ID */
1288 id &= ~(1<<host->this_id);
1293 sbcl = NCR_700_readb(host, SBCL_REG);
1294 if((sbcl & SBCL_IO) == 0) {
1295 /* mark as having been selected rather than reselected */
1298 /* convert to real ID */
1299 hostdata->reselection_id = id = bitmap_to_number(id);
1300 DEBUG(("scsi%d: Reselected by %d\n",
1301 host->host_no, id));
1303 if(hostdata->state == NCR_700_HOST_BUSY && SCp != NULL) {
1304 struct NCR_700_command_slot *slot =
1305 (struct NCR_700_command_slot *)SCp->host_scribble;
1306 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));
1308 switch(dsp - hostdata->pScript) {
1309 case Ent_Disconnect1:
1310 case Ent_Disconnect2:
1311 save_for_reselection(hostdata, SCp, Ent_Disconnect2 + hostdata->pScript);
1313 case Ent_Disconnect3:
1314 case Ent_Disconnect4:
1315 save_for_reselection(hostdata, SCp, Ent_Disconnect4 + hostdata->pScript);
1317 case Ent_Disconnect5:
1318 case Ent_Disconnect6:
1319 save_for_reselection(hostdata, SCp, Ent_Disconnect6 + hostdata->pScript);
1321 case Ent_Disconnect7:
1322 case Ent_Disconnect8:
1323 save_for_reselection(hostdata, SCp, Ent_Disconnect8 + hostdata->pScript);
1327 process_script_interrupt(A_GOOD_STATUS_AFTER_STATUS, dsp, SCp, host, hostdata);
1331 slot->state = NCR_700_SLOT_QUEUED;
1335 hostdata->state = NCR_700_HOST_BUSY;
1336 hostdata->cmd = NULL;
1337 /* clear any stale simple tag message */
1338 hostdata->msgin[1] = 0;
1339 dma_cache_sync(hostdata->msgin, MSG_ARRAY_SIZE,
1343 /* Selected as target, Ignore */
1344 resume_offset = hostdata->pScript + Ent_SelectedAsTarget;
1345 } else if(hostdata->tag_negotiated & (1<<id)) {
1346 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1348 resume_offset = hostdata->pScript + Ent_GetReselectionData;
1350 return resume_offset;
1354 NCR_700_clear_fifo(struct Scsi_Host *host) {
1355 const struct NCR_700_Host_Parameters *hostdata
1356 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1357 if(hostdata->chip710) {
1358 NCR_700_writeb(CLR_FIFO_710, host, CTEST8_REG);
1360 NCR_700_writeb(CLR_FIFO, host, DFIFO_REG);
1365 NCR_700_flush_fifo(struct Scsi_Host *host) {
1366 const struct NCR_700_Host_Parameters *hostdata
1367 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1368 if(hostdata->chip710) {
1369 NCR_700_writeb(FLUSH_DMA_FIFO_710, host, CTEST8_REG);
1371 NCR_700_writeb(0, host, CTEST8_REG);
1373 NCR_700_writeb(FLUSH_DMA_FIFO, host, DFIFO_REG);
1375 NCR_700_writeb(0, host, DFIFO_REG);
1380 /* The queue lock with interrupts disabled must be held on entry to
1383 NCR_700_start_command(struct scsi_cmnd *SCp)
1385 struct NCR_700_command_slot *slot =
1386 (struct NCR_700_command_slot *)SCp->host_scribble;
1387 struct NCR_700_Host_Parameters *hostdata =
1388 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1389 __u16 count = 1; /* for IDENTIFY message */
1391 if(hostdata->state != NCR_700_HOST_FREE) {
1392 /* keep this inside the lock to close the race window where
1393 * the running command finishes on another CPU while we don't
1394 * change the state to queued on this one */
1395 slot->state = NCR_700_SLOT_QUEUED;
1397 DEBUG(("scsi%d: host busy, queueing command %p, slot %p\n",
1398 SCp->device->host->host_no, slot->cmnd, slot));
1401 hostdata->state = NCR_700_HOST_BUSY;
1402 hostdata->cmd = SCp;
1403 slot->state = NCR_700_SLOT_BUSY;
1404 /* keep interrupts disabled until we have the command correctly
1405 * set up so we cannot take a selection interrupt */
1407 hostdata->msgout[0] = NCR_700_identify((SCp->cmnd[0] != REQUEST_SENSE &&
1408 slot->flags != NCR_700_FLAG_AUTOSENSE),
1410 /* for INQUIRY or REQUEST_SENSE commands, we cannot be sure
1411 * if the negotiated transfer parameters still hold, so
1412 * always renegotiate them */
1413 if(SCp->cmnd[0] == INQUIRY || SCp->cmnd[0] == REQUEST_SENSE ||
1414 slot->flags == NCR_700_FLAG_AUTOSENSE) {
1415 NCR_700_clear_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
1418 /* REQUEST_SENSE is asking for contingent I_T_L(_Q) status.
1419 * If a contingent allegiance condition exists, the device
1420 * will refuse all tags, so send the request sense as untagged
1422 if((hostdata->tag_negotiated & (1<<scmd_id(SCp)))
1423 && (slot->tag != SCSI_NO_TAG && SCp->cmnd[0] != REQUEST_SENSE &&
1424 slot->flags != NCR_700_FLAG_AUTOSENSE)) {
1425 count += scsi_populate_tag_msg(SCp, &hostdata->msgout[count]);
1428 if(hostdata->fast &&
1429 NCR_700_is_flag_clear(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC)) {
1430 count += spi_populate_sync_msg(&hostdata->msgout[count],
1431 spi_period(SCp->device->sdev_target),
1432 spi_offset(SCp->device->sdev_target));
1433 NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
1436 script_patch_16(hostdata->script, MessageCount, count);
1439 script_patch_ID(hostdata->script,
1440 Device_ID, 1<<scmd_id(SCp));
1442 script_patch_32_abs(hostdata->script, CommandAddress,
1444 script_patch_16(hostdata->script, CommandCount, SCp->cmd_len);
1445 /* finally plumb the beginning of the SG list into the script
1447 script_patch_32_abs(hostdata->script, SGScriptStartAddress,
1448 to32bit(&slot->pSG[0].ins));
1449 NCR_700_clear_fifo(SCp->device->host);
1451 if(slot->resume_offset == 0)
1452 slot->resume_offset = hostdata->pScript;
1453 /* now perform all the writebacks and invalidates */
1454 dma_cache_sync(hostdata->msgout, count, DMA_TO_DEVICE);
1455 dma_cache_sync(hostdata->msgin, MSG_ARRAY_SIZE,
1457 dma_cache_sync(SCp->cmnd, SCp->cmd_len, DMA_TO_DEVICE);
1458 dma_cache_sync(hostdata->status, 1, DMA_FROM_DEVICE);
1460 /* set the synchronous period/offset */
1461 NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
1462 SCp->device->host, SXFER_REG);
1463 NCR_700_writel(slot->temp, SCp->device->host, TEMP_REG);
1464 NCR_700_writel(slot->resume_offset, SCp->device->host, DSP_REG);
1470 NCR_700_intr(int irq, void *dev_id)
1472 struct Scsi_Host *host = (struct Scsi_Host *)dev_id;
1473 struct NCR_700_Host_Parameters *hostdata =
1474 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1476 __u32 resume_offset = 0;
1477 __u8 pun = 0xff, lun = 0xff;
1478 unsigned long flags;
1481 /* Use the host lock to serialise acess to the 53c700
1482 * hardware. Note: In future, we may need to take the queue
1483 * lock to enter the done routines. When that happens, we
1484 * need to ensure that for this driver, the host lock and the
1485 * queue lock point to the same thing. */
1486 spin_lock_irqsave(host->host_lock, flags);
1487 if((istat = NCR_700_readb(host, ISTAT_REG))
1488 & (SCSI_INT_PENDING | DMA_INT_PENDING)) {
1490 __u8 sstat0 = 0, dstat = 0;
1492 struct scsi_cmnd *SCp = hostdata->cmd;
1493 enum NCR_700_Host_State state;
1496 state = hostdata->state;
1497 SCp = hostdata->cmd;
1499 if(istat & SCSI_INT_PENDING) {
1502 sstat0 = NCR_700_readb(host, SSTAT0_REG);
1505 if(istat & DMA_INT_PENDING) {
1508 dstat = NCR_700_readb(host, DSTAT_REG);
1511 dsps = NCR_700_readl(host, DSPS_REG);
1512 dsp = NCR_700_readl(host, DSP_REG);
1514 DEBUG(("scsi%d: istat %02x sstat0 %02x dstat %02x dsp %04x[%08x] dsps 0x%x\n",
1515 host->host_no, istat, sstat0, dstat,
1516 (dsp - (__u32)(hostdata->pScript))/4,
1520 pun = SCp->device->id;
1521 lun = SCp->device->lun;
1524 if(sstat0 & SCSI_RESET_DETECTED) {
1525 struct scsi_device *SDp;
1528 hostdata->state = NCR_700_HOST_BUSY;
1530 printk(KERN_ERR "scsi%d: Bus Reset detected, executing command %p, slot %p, dsp %08x[%04x]\n",
1531 host->host_no, SCp, SCp == NULL ? NULL : SCp->host_scribble, dsp, dsp - hostdata->pScript);
1533 scsi_report_bus_reset(host, 0);
1535 /* clear all the negotiated parameters */
1536 __shost_for_each_device(SDp, host)
1537 NCR_700_clear_flag(SDp, ~0);
1539 /* clear all the slots and their pending commands */
1540 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1541 struct scsi_cmnd *SCp;
1542 struct NCR_700_command_slot *slot =
1543 &hostdata->slots[i];
1545 if(slot->state == NCR_700_SLOT_FREE)
1549 printk(KERN_ERR " failing command because of reset, slot %p, cmnd %p\n",
1551 free_slot(slot, hostdata);
1552 SCp->host_scribble = NULL;
1553 NCR_700_set_depth(SCp->device, 0);
1554 /* NOTE: deadlock potential here: we
1555 * rely on mid-layer guarantees that
1556 * scsi_done won't try to issue the
1557 * command again otherwise we'll
1559 * hostdata->state_lock */
1560 SCp->result = DID_RESET << 16;
1561 SCp->scsi_done(SCp);
1564 NCR_700_chip_setup(host);
1566 hostdata->state = NCR_700_HOST_FREE;
1567 hostdata->cmd = NULL;
1568 /* signal back if this was an eh induced reset */
1569 if(hostdata->eh_complete != NULL)
1570 complete(hostdata->eh_complete);
1572 } else if(sstat0 & SELECTION_TIMEOUT) {
1573 DEBUG(("scsi%d: (%d:%d) selection timeout\n",
1574 host->host_no, pun, lun));
1575 NCR_700_scsi_done(hostdata, SCp, DID_NO_CONNECT<<16);
1576 } else if(sstat0 & PHASE_MISMATCH) {
1577 struct NCR_700_command_slot *slot = (SCp == NULL) ? NULL :
1578 (struct NCR_700_command_slot *)SCp->host_scribble;
1580 if(dsp == Ent_SendMessage + 8 + hostdata->pScript) {
1581 /* It wants to reply to some part of
1583 #ifdef NCR_700_DEBUG
1584 __u32 temp = NCR_700_readl(host, TEMP_REG);
1585 int count = (hostdata->script[Ent_SendMessage/4] & 0xffffff) - ((NCR_700_readl(host, DBC_REG) & 0xffffff) + NCR_700_data_residual(host));
1586 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)));
1588 resume_offset = hostdata->pScript + Ent_SendMessagePhaseMismatch;
1589 } else if(dsp >= to32bit(&slot->pSG[0].ins) &&
1590 dsp <= to32bit(&slot->pSG[NCR_700_SG_SEGMENTS].ins)) {
1591 int data_transfer = NCR_700_readl(host, DBC_REG) & 0xffffff;
1592 int SGcount = (dsp - to32bit(&slot->pSG[0].ins))/sizeof(struct NCR_700_SG_List);
1593 int residual = NCR_700_data_residual(host);
1595 #ifdef NCR_700_DEBUG
1596 __u32 naddr = NCR_700_readl(host, DNAD_REG);
1598 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x\n",
1599 host->host_no, pun, lun,
1600 SGcount, data_transfer);
1601 scsi_print_command(SCp);
1603 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x, residual %d\n",
1604 host->host_no, pun, lun,
1605 SGcount, data_transfer, residual);
1608 data_transfer += residual;
1610 if(data_transfer != 0) {
1616 count = (bS_to_cpu(slot->SG[SGcount].ins) & 0x00ffffff);
1617 DEBUG(("DATA TRANSFER MISMATCH, count = %d, transferred %d\n", count, count-data_transfer));
1618 slot->SG[SGcount].ins &= bS_to_host(0xff000000);
1619 slot->SG[SGcount].ins |= bS_to_host(data_transfer);
1620 pAddr = bS_to_cpu(slot->SG[SGcount].pAddr);
1621 pAddr += (count - data_transfer);
1622 #ifdef NCR_700_DEBUG
1623 if(pAddr != naddr) {
1624 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);
1627 slot->SG[SGcount].pAddr = bS_to_host(pAddr);
1629 /* set the executed moves to nops */
1630 for(i=0; i<SGcount; i++) {
1631 slot->SG[i].ins = bS_to_host(SCRIPT_NOP);
1632 slot->SG[i].pAddr = 0;
1634 dma_cache_sync(slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1635 /* and pretend we disconnected after
1636 * the command phase */
1637 resume_offset = hostdata->pScript + Ent_MsgInDuringData;
1638 /* make sure all the data is flushed */
1639 NCR_700_flush_fifo(host);
1641 __u8 sbcl = NCR_700_readb(host, SBCL_REG);
1642 printk(KERN_ERR "scsi%d: (%d:%d) phase mismatch at %04x, phase %s\n",
1643 host->host_no, pun, lun, dsp - hostdata->pScript, sbcl_to_string(sbcl));
1644 NCR_700_internal_bus_reset(host);
1647 } else if(sstat0 & SCSI_GROSS_ERROR) {
1648 printk(KERN_ERR "scsi%d: (%d:%d) GROSS ERROR\n",
1649 host->host_no, pun, lun);
1650 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1651 } else if(sstat0 & PARITY_ERROR) {
1652 printk(KERN_ERR "scsi%d: (%d:%d) PARITY ERROR\n",
1653 host->host_no, pun, lun);
1654 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1655 } else if(dstat & SCRIPT_INT_RECEIVED) {
1656 DEBUG(("scsi%d: (%d:%d) ====>SCRIPT INTERRUPT<====\n",
1657 host->host_no, pun, lun));
1658 resume_offset = process_script_interrupt(dsps, dsp, SCp, host, hostdata);
1659 } else if(dstat & (ILGL_INST_DETECTED)) {
1660 printk(KERN_ERR "scsi%d: (%d:%d) Illegal Instruction detected at 0x%08x[0x%x]!!!\n"
1661 " Please email James.Bottomley@HansenPartnership.com with the details\n",
1662 host->host_no, pun, lun,
1663 dsp, dsp - hostdata->pScript);
1664 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1665 } else if(dstat & (WATCH_DOG_INTERRUPT|ABORTED)) {
1666 printk(KERN_ERR "scsi%d: (%d:%d) serious DMA problem, dstat=%02x\n",
1667 host->host_no, pun, lun, dstat);
1668 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1672 /* NOTE: selection interrupt processing MUST occur
1673 * after script interrupt processing to correctly cope
1674 * with the case where we process a disconnect and
1675 * then get reselected before we process the
1677 if(sstat0 & SELECTED) {
1678 /* FIXME: It currently takes at least FOUR
1679 * interrupts to complete a command that
1680 * disconnects: one for the disconnect, one
1681 * for the reselection, one to get the
1682 * reselection data and one to complete the
1683 * command. If we guess the reselected
1684 * command here and prepare it, we only need
1685 * to get a reselection data interrupt if we
1686 * guessed wrongly. Since the interrupt
1687 * overhead is much greater than the command
1688 * setup, this would be an efficient
1689 * optimisation particularly as we probably
1690 * only have one outstanding command on a
1691 * target most of the time */
1693 resume_offset = process_selection(host, dsp);
1700 if(hostdata->state != NCR_700_HOST_BUSY) {
1701 printk(KERN_ERR "scsi%d: Driver error: resume at 0x%08x [0x%04x] with non busy host!\n",
1702 host->host_no, resume_offset, resume_offset - hostdata->pScript);
1703 hostdata->state = NCR_700_HOST_BUSY;
1706 DEBUG(("Attempting to resume at %x\n", resume_offset));
1707 NCR_700_clear_fifo(host);
1708 NCR_700_writel(resume_offset, host, DSP_REG);
1710 /* There is probably a technical no-no about this: If we're a
1711 * shared interrupt and we got this interrupt because the
1712 * other device needs servicing not us, we're still going to
1713 * check our queued commands here---of course, there shouldn't
1714 * be any outstanding.... */
1715 if(hostdata->state == NCR_700_HOST_FREE) {
1718 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1719 /* fairness: always run the queue from the last
1720 * position we left off */
1721 int j = (i + hostdata->saved_slot_position)
1722 % NCR_700_COMMAND_SLOTS_PER_HOST;
1724 if(hostdata->slots[j].state != NCR_700_SLOT_QUEUED)
1726 if(NCR_700_start_command(hostdata->slots[j].cmnd)) {
1727 DEBUG(("scsi%d: Issuing saved command slot %p, cmd %p\t\n",
1728 host->host_no, &hostdata->slots[j],
1729 hostdata->slots[j].cmnd));
1730 hostdata->saved_slot_position = j + 1;
1737 spin_unlock_irqrestore(host->host_lock, flags);
1738 return IRQ_RETVAL(handled);
1742 NCR_700_queuecommand(struct scsi_cmnd *SCp, void (*done)(struct scsi_cmnd *))
1744 struct NCR_700_Host_Parameters *hostdata =
1745 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1747 enum dma_data_direction direction;
1748 struct NCR_700_command_slot *slot;
1750 if(hostdata->command_slot_count >= NCR_700_COMMAND_SLOTS_PER_HOST) {
1751 /* We're over our allocation, this should never happen
1752 * since we report the max allocation to the mid layer */
1753 printk(KERN_WARNING "scsi%d: Command depth has gone over queue depth\n", SCp->device->host->host_no);
1756 /* check for untagged commands. We cannot have any outstanding
1757 * commands if we accept them. Commands could be untagged because:
1759 * - The tag negotiated bitmap is clear
1760 * - The blk layer sent and untagged command
1762 if(NCR_700_get_depth(SCp->device) != 0
1763 && (!(hostdata->tag_negotiated & (1<<scmd_id(SCp)))
1764 || !blk_rq_tagged(SCp->request))) {
1765 CDEBUG(KERN_ERR, SCp, "has non zero depth %d\n",
1766 NCR_700_get_depth(SCp->device));
1767 return SCSI_MLQUEUE_DEVICE_BUSY;
1769 if(NCR_700_get_depth(SCp->device) >= SCp->device->queue_depth) {
1770 CDEBUG(KERN_ERR, SCp, "has max tag depth %d\n",
1771 NCR_700_get_depth(SCp->device));
1772 return SCSI_MLQUEUE_DEVICE_BUSY;
1774 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) + 1);
1776 /* begin the command here */
1777 /* no need to check for NULL, test for command_slot_count above
1778 * ensures a slot is free */
1779 slot = find_empty_slot(hostdata);
1783 SCp->scsi_done = done;
1784 SCp->host_scribble = (unsigned char *)slot;
1785 SCp->SCp.ptr = NULL;
1786 SCp->SCp.buffer = NULL;
1788 #ifdef NCR_700_DEBUG
1789 printk("53c700: scsi%d, command ", SCp->device->host->host_no);
1790 scsi_print_command(SCp);
1792 if(blk_rq_tagged(SCp->request)
1793 && (hostdata->tag_negotiated &(1<<scmd_id(SCp))) == 0
1794 && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_START_TAG_NEGOTIATION) {
1795 scmd_printk(KERN_ERR, SCp, "Enabling Tag Command Queuing\n");
1796 hostdata->tag_negotiated |= (1<<scmd_id(SCp));
1797 NCR_700_set_tag_neg_state(SCp->device, NCR_700_DURING_TAG_NEGOTIATION);
1800 /* here we may have to process an untagged command. The gate
1801 * above ensures that this will be the only one outstanding,
1802 * so clear the tag negotiated bit.
1804 * FIXME: This will royally screw up on multiple LUN devices
1806 if(!blk_rq_tagged(SCp->request)
1807 && (hostdata->tag_negotiated &(1<<scmd_id(SCp)))) {
1808 scmd_printk(KERN_INFO, SCp, "Disabling Tag Command Queuing\n");
1809 hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
1812 if((hostdata->tag_negotiated &(1<<scmd_id(SCp)))
1813 && scsi_get_tag_type(SCp->device)) {
1814 slot->tag = SCp->request->tag;
1815 CDEBUG(KERN_DEBUG, SCp, "sending out tag %d, slot %p\n",
1818 slot->tag = SCSI_NO_TAG;
1819 /* must populate current_cmnd for scsi_find_tag to work */
1820 SCp->device->current_cmnd = SCp;
1822 /* sanity check: some of the commands generated by the mid-layer
1823 * have an eccentric idea of their sc_data_direction */
1824 if(!SCp->use_sg && !SCp->request_bufflen
1825 && SCp->sc_data_direction != DMA_NONE) {
1826 #ifdef NCR_700_DEBUG
1827 printk("53c700: Command");
1828 scsi_print_command(SCp);
1829 printk("Has wrong data direction %d\n", SCp->sc_data_direction);
1831 SCp->sc_data_direction = DMA_NONE;
1834 switch (SCp->cmnd[0]) {
1836 /* clear the internal sense magic */
1840 /* OK, get it from the command */
1841 switch(SCp->sc_data_direction) {
1842 case DMA_BIDIRECTIONAL:
1844 printk(KERN_ERR "53c700: Unknown command for data direction ");
1845 scsi_print_command(SCp);
1852 case DMA_FROM_DEVICE:
1853 move_ins = SCRIPT_MOVE_DATA_IN;
1856 move_ins = SCRIPT_MOVE_DATA_OUT;
1861 /* now build the scatter gather list */
1862 direction = SCp->sc_data_direction;
1866 dma_addr_t vPtr = 0;
1870 sg_count = dma_map_sg(hostdata->dev,
1871 SCp->request_buffer, SCp->use_sg,
1874 vPtr = dma_map_single(hostdata->dev,
1875 SCp->request_buffer,
1876 SCp->request_bufflen,
1878 count = SCp->request_bufflen;
1879 slot->dma_handle = vPtr;
1884 for(i = 0; i < sg_count; i++) {
1887 struct scatterlist *sg = SCp->request_buffer;
1889 vPtr = sg_dma_address(&sg[i]);
1890 count = sg_dma_len(&sg[i]);
1893 slot->SG[i].ins = bS_to_host(move_ins | count);
1894 DEBUG((" scatter block %d: move %d[%08x] from 0x%lx\n",
1895 i, count, slot->SG[i].ins, (unsigned long)vPtr));
1896 slot->SG[i].pAddr = bS_to_host(vPtr);
1898 slot->SG[i].ins = bS_to_host(SCRIPT_RETURN);
1899 slot->SG[i].pAddr = 0;
1900 dma_cache_sync(slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1901 DEBUG((" SETTING %08lx to %x\n",
1902 (&slot->pSG[i].ins),
1905 slot->resume_offset = 0;
1906 slot->pCmd = dma_map_single(hostdata->dev, SCp->cmnd,
1907 sizeof(SCp->cmnd), DMA_TO_DEVICE);
1908 NCR_700_start_command(SCp);
1913 NCR_700_abort(struct scsi_cmnd * SCp)
1915 struct NCR_700_command_slot *slot;
1917 scmd_printk(KERN_INFO, SCp,
1918 "New error handler wants to abort command\n\t");
1919 scsi_print_command(SCp);
1921 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1924 /* no outstanding command to abort */
1926 if(SCp->cmnd[0] == TEST_UNIT_READY) {
1927 /* FIXME: This is because of a problem in the new
1928 * error handler. When it is in error recovery, it
1929 * will send a TUR to a device it thinks may still be
1930 * showing a problem. If the TUR isn't responded to,
1931 * it will abort it and mark the device off line.
1932 * Unfortunately, it does no other error recovery, so
1933 * this would leave us with an outstanding command
1934 * occupying a slot. Rather than allow this to
1935 * happen, we issue a bus reset to force all
1936 * outstanding commands to terminate here. */
1937 NCR_700_internal_bus_reset(SCp->device->host);
1938 /* still drop through and return failed */
1945 NCR_700_bus_reset(struct scsi_cmnd * SCp)
1947 DECLARE_COMPLETION_ONSTACK(complete);
1948 struct NCR_700_Host_Parameters *hostdata =
1949 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1951 scmd_printk(KERN_INFO, SCp,
1952 "New error handler wants BUS reset, cmd %p\n\t", SCp);
1953 scsi_print_command(SCp);
1955 /* In theory, eh_complete should always be null because the
1956 * eh is single threaded, but just in case we're handling a
1957 * reset via sg or something */
1958 spin_lock_irq(SCp->device->host->host_lock);
1959 while (hostdata->eh_complete != NULL) {
1960 spin_unlock_irq(SCp->device->host->host_lock);
1961 msleep_interruptible(100);
1962 spin_lock_irq(SCp->device->host->host_lock);
1965 hostdata->eh_complete = &complete;
1966 NCR_700_internal_bus_reset(SCp->device->host);
1968 spin_unlock_irq(SCp->device->host->host_lock);
1969 wait_for_completion(&complete);
1970 spin_lock_irq(SCp->device->host->host_lock);
1972 hostdata->eh_complete = NULL;
1973 /* Revalidate the transport parameters of the failing device */
1975 spi_schedule_dv_device(SCp->device);
1977 spin_unlock_irq(SCp->device->host->host_lock);
1982 NCR_700_host_reset(struct scsi_cmnd * SCp)
1984 scmd_printk(KERN_INFO, SCp, "New error handler wants HOST reset\n\t");
1985 scsi_print_command(SCp);
1987 spin_lock_irq(SCp->device->host->host_lock);
1989 NCR_700_internal_bus_reset(SCp->device->host);
1990 NCR_700_chip_reset(SCp->device->host);
1992 spin_unlock_irq(SCp->device->host->host_lock);
1998 NCR_700_set_period(struct scsi_target *STp, int period)
2000 struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
2001 struct NCR_700_Host_Parameters *hostdata =
2002 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
2007 if(period < hostdata->min_period)
2008 period = hostdata->min_period;
2010 spi_period(STp) = period;
2011 spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2012 NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2013 spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2017 NCR_700_set_offset(struct scsi_target *STp, int offset)
2019 struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
2020 struct NCR_700_Host_Parameters *hostdata =
2021 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
2022 int max_offset = hostdata->chip710
2023 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET;
2028 if(offset > max_offset)
2029 offset = max_offset;
2031 /* if we're currently async, make sure the period is reasonable */
2032 if(spi_offset(STp) == 0 && (spi_period(STp) < hostdata->min_period ||
2033 spi_period(STp) > 0xff))
2034 spi_period(STp) = hostdata->min_period;
2036 spi_offset(STp) = offset;
2037 spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2038 NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2039 spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2043 NCR_700_slave_alloc(struct scsi_device *SDp)
2045 SDp->hostdata = kzalloc(sizeof(struct NCR_700_Device_Parameters),
2055 NCR_700_slave_configure(struct scsi_device *SDp)
2057 struct NCR_700_Host_Parameters *hostdata =
2058 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2060 /* to do here: allocate memory; build a queue_full list */
2061 if(SDp->tagged_supported) {
2062 scsi_set_tag_type(SDp, MSG_ORDERED_TAG);
2063 scsi_activate_tcq(SDp, NCR_700_DEFAULT_TAGS);
2064 NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2066 /* initialise to default depth */
2067 scsi_adjust_queue_depth(SDp, 0, SDp->host->cmd_per_lun);
2069 if(hostdata->fast) {
2070 /* Find the correct offset and period via domain validation */
2071 if (!spi_initial_dv(SDp->sdev_target))
2074 spi_offset(SDp->sdev_target) = 0;
2075 spi_period(SDp->sdev_target) = 0;
2081 NCR_700_slave_destroy(struct scsi_device *SDp)
2083 kfree(SDp->hostdata);
2084 SDp->hostdata = NULL;
2088 NCR_700_change_queue_depth(struct scsi_device *SDp, int depth)
2090 if (depth > NCR_700_MAX_TAGS)
2091 depth = NCR_700_MAX_TAGS;
2093 scsi_adjust_queue_depth(SDp, scsi_get_tag_type(SDp), depth);
2097 static int NCR_700_change_queue_type(struct scsi_device *SDp, int tag_type)
2099 int change_tag = ((tag_type ==0 && scsi_get_tag_type(SDp) != 0)
2100 || (tag_type != 0 && scsi_get_tag_type(SDp) == 0));
2101 struct NCR_700_Host_Parameters *hostdata =
2102 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2104 scsi_set_tag_type(SDp, tag_type);
2106 /* We have a global (per target) flag to track whether TCQ is
2107 * enabled, so we'll be turning it off for the entire target here.
2108 * our tag algorithm will fail if we mix tagged and untagged commands,
2109 * so quiesce the device before doing this */
2111 scsi_target_quiesce(SDp->sdev_target);
2114 /* shift back to the default unqueued number of commands
2115 * (the user can still raise this) */
2116 scsi_deactivate_tcq(SDp, SDp->host->cmd_per_lun);
2117 hostdata->tag_negotiated &= ~(1 << sdev_id(SDp));
2119 /* Here, we cleared the negotiation flag above, so this
2120 * will force the driver to renegotiate */
2121 scsi_activate_tcq(SDp, SDp->queue_depth);
2123 NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2126 scsi_target_resume(SDp->sdev_target);
2132 NCR_700_show_active_tags(struct device *dev, struct device_attribute *attr, char *buf)
2134 struct scsi_device *SDp = to_scsi_device(dev);
2136 return snprintf(buf, 20, "%d\n", NCR_700_get_depth(SDp));
2139 static struct device_attribute NCR_700_active_tags_attr = {
2141 .name = "active_tags",
2144 .show = NCR_700_show_active_tags,
2147 STATIC struct device_attribute *NCR_700_dev_attrs[] = {
2148 &NCR_700_active_tags_attr,
2152 EXPORT_SYMBOL(NCR_700_detect);
2153 EXPORT_SYMBOL(NCR_700_release);
2154 EXPORT_SYMBOL(NCR_700_intr);
2156 static struct spi_function_template NCR_700_transport_functions = {
2157 .set_period = NCR_700_set_period,
2159 .set_offset = NCR_700_set_offset,
2163 static int __init NCR_700_init(void)
2165 NCR_700_transport_template = spi_attach_transport(&NCR_700_transport_functions);
2166 if(!NCR_700_transport_template)
2171 static void __exit NCR_700_exit(void)
2173 spi_release_transport(NCR_700_transport_template);
2176 module_init(NCR_700_init);
2177 module_exit(NCR_700_exit);