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/init.h>
125 #include <linux/proc_fs.h>
126 #include <linux/blkdev.h>
127 #include <linux/module.h>
128 #include <linux/interrupt.h>
129 #include <linux/device.h>
131 #include <asm/system.h>
133 #include <asm/pgtable.h>
134 #include <asm/byteorder.h>
136 #include <scsi/scsi.h>
137 #include <scsi/scsi_cmnd.h>
138 #include <scsi/scsi_dbg.h>
139 #include <scsi/scsi_eh.h>
140 #include <scsi/scsi_host.h>
141 #include <scsi/scsi_tcq.h>
142 #include <scsi/scsi_transport.h>
143 #include <scsi/scsi_transport_spi.h>
147 /* NOTE: For 64 bit drivers there are points in the code where we use
148 * a non dereferenceable pointer to point to a structure in dma-able
149 * memory (which is 32 bits) so that we can use all of the structure
150 * operations but take the address at the end. This macro allows us
151 * to truncate the 64 bit pointer down to 32 bits without the compiler
153 #define to32bit(x) ((__u32)((unsigned long)(x)))
158 #define STATIC static
161 MODULE_AUTHOR("James Bottomley");
162 MODULE_DESCRIPTION("53c700 and 53c700-66 Driver");
163 MODULE_LICENSE("GPL");
165 /* This is the script */
166 #include "53c700_d.h"
169 STATIC int NCR_700_queuecommand(struct scsi_cmnd *, void (*done)(struct scsi_cmnd *));
170 STATIC int NCR_700_abort(struct scsi_cmnd * SCpnt);
171 STATIC int NCR_700_bus_reset(struct scsi_cmnd * SCpnt);
172 STATIC int NCR_700_host_reset(struct scsi_cmnd * SCpnt);
173 STATIC void NCR_700_chip_setup(struct Scsi_Host *host);
174 STATIC void NCR_700_chip_reset(struct Scsi_Host *host);
175 STATIC int NCR_700_slave_alloc(struct scsi_device *SDpnt);
176 STATIC int NCR_700_slave_configure(struct scsi_device *SDpnt);
177 STATIC void NCR_700_slave_destroy(struct scsi_device *SDpnt);
178 static int NCR_700_change_queue_depth(struct scsi_device *SDpnt, int depth);
179 static int NCR_700_change_queue_type(struct scsi_device *SDpnt, int depth);
181 STATIC struct device_attribute *NCR_700_dev_attrs[];
183 STATIC struct scsi_transport_template *NCR_700_transport_template = NULL;
185 static char *NCR_700_phase[] = {
188 "before command phase",
189 "after command phase",
190 "after status phase",
191 "after data in phase",
192 "after data out phase",
196 static char *NCR_700_condition[] = {
204 "REJECT_MSG RECEIVED",
205 "DISCONNECT_MSG RECEIVED",
211 static char *NCR_700_fatal_messages[] = {
212 "unexpected message after reselection",
213 "still MSG_OUT after message injection",
214 "not MSG_IN after selection",
215 "Illegal message length received",
218 static char *NCR_700_SBCL_bits[] = {
229 static char *NCR_700_SBCL_to_phase[] = {
240 /* This translates the SDTR message offset and period to a value
241 * which can be loaded into the SXFER_REG.
243 * NOTE: According to SCSI-2, the true transfer period (in ns) is
244 * actually four times this period value */
246 NCR_700_offset_period_to_sxfer(struct NCR_700_Host_Parameters *hostdata,
247 __u8 offset, __u8 period)
251 __u8 min_xferp = (hostdata->chip710
252 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
253 __u8 max_offset = (hostdata->chip710
254 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET);
259 if(period < hostdata->min_period) {
260 printk(KERN_WARNING "53c700: Period %dns is less than this chip's minimum, setting to %d\n", period*4, NCR_700_MIN_PERIOD*4);
261 period = hostdata->min_period;
263 XFERP = (period*4 * hostdata->sync_clock)/1000 - 4;
264 if(offset > max_offset) {
265 printk(KERN_WARNING "53c700: Offset %d exceeds chip maximum, setting to %d\n",
269 if(XFERP < min_xferp) {
270 printk(KERN_WARNING "53c700: XFERP %d is less than minium, setting to %d\n",
274 return (offset & 0x0f) | (XFERP & 0x07)<<4;
278 NCR_700_get_SXFER(struct scsi_device *SDp)
280 struct NCR_700_Host_Parameters *hostdata =
281 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
283 return NCR_700_offset_period_to_sxfer(hostdata,
284 spi_offset(SDp->sdev_target),
285 spi_period(SDp->sdev_target));
289 NCR_700_detect(struct scsi_host_template *tpnt,
290 struct NCR_700_Host_Parameters *hostdata, struct device *dev)
292 dma_addr_t pScript, pSlots;
295 struct Scsi_Host *host;
296 static int banner = 0;
299 if(tpnt->sdev_attrs == NULL)
300 tpnt->sdev_attrs = NCR_700_dev_attrs;
302 memory = dma_alloc_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
303 &pScript, GFP_KERNEL);
305 printk(KERN_ERR "53c700: Failed to allocate memory for driver, detatching\n");
309 script = (__u32 *)memory;
310 hostdata->msgin = memory + MSGIN_OFFSET;
311 hostdata->msgout = memory + MSGOUT_OFFSET;
312 hostdata->status = memory + STATUS_OFFSET;
313 /* all of these offsets are L1_CACHE_BYTES separated. It is fatal
314 * if this isn't sufficient separation to avoid dma flushing issues */
315 BUG_ON(!dma_is_consistent(hostdata->dev, pScript) && L1_CACHE_BYTES < dma_get_cache_alignment());
316 hostdata->slots = (struct NCR_700_command_slot *)(memory + SLOTS_OFFSET);
319 pSlots = pScript + SLOTS_OFFSET;
321 /* Fill in the missing routines from the host template */
322 tpnt->queuecommand = NCR_700_queuecommand;
323 tpnt->eh_abort_handler = NCR_700_abort;
324 tpnt->eh_bus_reset_handler = NCR_700_bus_reset;
325 tpnt->eh_host_reset_handler = NCR_700_host_reset;
326 tpnt->can_queue = NCR_700_COMMAND_SLOTS_PER_HOST;
327 tpnt->sg_tablesize = NCR_700_SG_SEGMENTS;
328 tpnt->cmd_per_lun = NCR_700_CMD_PER_LUN;
329 tpnt->use_clustering = ENABLE_CLUSTERING;
330 tpnt->slave_configure = NCR_700_slave_configure;
331 tpnt->slave_destroy = NCR_700_slave_destroy;
332 tpnt->slave_alloc = NCR_700_slave_alloc;
333 tpnt->change_queue_depth = NCR_700_change_queue_depth;
334 tpnt->change_queue_type = NCR_700_change_queue_type;
336 if(tpnt->name == NULL)
337 tpnt->name = "53c700";
338 if(tpnt->proc_name == NULL)
339 tpnt->proc_name = "53c700";
341 host = scsi_host_alloc(tpnt, 4);
344 memset(hostdata->slots, 0, sizeof(struct NCR_700_command_slot)
345 * NCR_700_COMMAND_SLOTS_PER_HOST);
346 for (j = 0; j < NCR_700_COMMAND_SLOTS_PER_HOST; j++) {
347 dma_addr_t offset = (dma_addr_t)((unsigned long)&hostdata->slots[j].SG[0]
348 - (unsigned long)&hostdata->slots[0].SG[0]);
349 hostdata->slots[j].pSG = (struct NCR_700_SG_List *)((unsigned long)(pSlots + offset));
351 hostdata->free_list = &hostdata->slots[j];
353 hostdata->slots[j-1].ITL_forw = &hostdata->slots[j];
354 hostdata->slots[j].state = NCR_700_SLOT_FREE;
357 for (j = 0; j < ARRAY_SIZE(SCRIPT); j++)
358 script[j] = bS_to_host(SCRIPT[j]);
360 /* adjust all labels to be bus physical */
361 for (j = 0; j < PATCHES; j++)
362 script[LABELPATCHES[j]] = bS_to_host(pScript + SCRIPT[LABELPATCHES[j]]);
363 /* now patch up fixed addresses. */
364 script_patch_32(hostdata->dev, script, MessageLocation,
365 pScript + MSGOUT_OFFSET);
366 script_patch_32(hostdata->dev, script, StatusAddress,
367 pScript + STATUS_OFFSET);
368 script_patch_32(hostdata->dev, script, ReceiveMsgAddress,
369 pScript + MSGIN_OFFSET);
371 hostdata->script = script;
372 hostdata->pScript = pScript;
373 dma_sync_single_for_device(hostdata->dev, pScript, sizeof(SCRIPT), DMA_TO_DEVICE);
374 hostdata->state = NCR_700_HOST_FREE;
375 hostdata->cmd = NULL;
377 host->max_lun = NCR_700_MAX_LUNS;
378 BUG_ON(NCR_700_transport_template == NULL);
379 host->transportt = NCR_700_transport_template;
380 host->unique_id = (unsigned long)hostdata->base;
381 hostdata->eh_complete = NULL;
382 host->hostdata[0] = (unsigned long)hostdata;
384 NCR_700_writeb(0xff, host, CTEST9_REG);
385 if (hostdata->chip710)
386 hostdata->rev = (NCR_700_readb(host, CTEST8_REG)>>4) & 0x0f;
388 hostdata->rev = (NCR_700_readb(host, CTEST7_REG)>>4) & 0x0f;
389 hostdata->fast = (NCR_700_readb(host, CTEST9_REG) == 0);
391 printk(KERN_NOTICE "53c700: Version " NCR_700_VERSION " By James.Bottomley@HansenPartnership.com\n");
394 printk(KERN_NOTICE "scsi%d: %s rev %d %s\n", host->host_no,
395 hostdata->chip710 ? "53c710" :
396 (hostdata->fast ? "53c700-66" : "53c700"),
397 hostdata->rev, hostdata->differential ?
398 "(Differential)" : "");
400 NCR_700_chip_reset(host);
402 if (scsi_add_host(host, dev)) {
403 dev_printk(KERN_ERR, dev, "53c700: scsi_add_host failed\n");
408 spi_signalling(host) = hostdata->differential ? SPI_SIGNAL_HVD :
415 NCR_700_release(struct Scsi_Host *host)
417 struct NCR_700_Host_Parameters *hostdata =
418 (struct NCR_700_Host_Parameters *)host->hostdata[0];
420 dma_free_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
421 hostdata->script, hostdata->pScript);
426 NCR_700_identify(int can_disconnect, __u8 lun)
428 return IDENTIFY_BASE |
429 ((can_disconnect) ? 0x40 : 0) |
430 (lun & NCR_700_LUN_MASK);
434 * Function : static int data_residual (Scsi_Host *host)
436 * Purpose : return residual data count of what's in the chip. If you
437 * really want to know what this function is doing, it's almost a
438 * direct transcription of the algorithm described in the 53c710
439 * guide, except that the DBC and DFIFO registers are only 6 bits
442 * Inputs : host - SCSI host */
444 NCR_700_data_residual (struct Scsi_Host *host) {
445 struct NCR_700_Host_Parameters *hostdata =
446 (struct NCR_700_Host_Parameters *)host->hostdata[0];
447 int count, synchronous = 0;
450 if(hostdata->chip710) {
451 count = ((NCR_700_readb(host, DFIFO_REG) & 0x7f) -
452 (NCR_700_readl(host, DBC_REG) & 0x7f)) & 0x7f;
454 count = ((NCR_700_readb(host, DFIFO_REG) & 0x3f) -
455 (NCR_700_readl(host, DBC_REG) & 0x3f)) & 0x3f;
459 synchronous = NCR_700_readb(host, SXFER_REG) & 0x0f;
461 /* get the data direction */
462 ddir = NCR_700_readb(host, CTEST0_REG) & 0x01;
467 count += (NCR_700_readb(host, SSTAT2_REG) & 0xf0) >> 4;
469 if (NCR_700_readb(host, SSTAT1_REG) & SIDL_REG_FULL)
473 __u8 sstat = NCR_700_readb(host, SSTAT1_REG);
474 if (sstat & SODL_REG_FULL)
476 if (synchronous && (sstat & SODR_REG_FULL))
481 printk("RESIDUAL IS %d (ddir %d)\n", count, ddir);
486 /* print out the SCSI wires and corresponding phase from the SBCL register
489 sbcl_to_string(__u8 sbcl)
492 static char ret[256];
497 strcat(ret, NCR_700_SBCL_bits[i]);
499 strcat(ret, NCR_700_SBCL_to_phase[sbcl & 0x07]);
504 bitmap_to_number(__u8 bitmap)
508 for(i=0; i<8 && !(bitmap &(1<<i)); i++)
513 /* Pull a slot off the free list */
514 STATIC struct NCR_700_command_slot *
515 find_empty_slot(struct NCR_700_Host_Parameters *hostdata)
517 struct NCR_700_command_slot *slot = hostdata->free_list;
521 if(hostdata->command_slot_count != NCR_700_COMMAND_SLOTS_PER_HOST)
522 printk(KERN_ERR "SLOTS FULL, but count is %d, should be %d\n", hostdata->command_slot_count, NCR_700_COMMAND_SLOTS_PER_HOST);
526 if(slot->state != NCR_700_SLOT_FREE)
528 printk(KERN_ERR "BUSY SLOT ON FREE LIST!!!\n");
531 hostdata->free_list = slot->ITL_forw;
532 slot->ITL_forw = NULL;
535 /* NOTE: set the state to busy here, not queued, since this
536 * indicates the slot is in use and cannot be run by the IRQ
537 * finish routine. If we cannot queue the command when it
538 * is properly build, we then change to NCR_700_SLOT_QUEUED */
539 slot->state = NCR_700_SLOT_BUSY;
541 hostdata->command_slot_count++;
547 free_slot(struct NCR_700_command_slot *slot,
548 struct NCR_700_Host_Parameters *hostdata)
550 if((slot->state & NCR_700_SLOT_MASK) != NCR_700_SLOT_MAGIC) {
551 printk(KERN_ERR "53c700: SLOT %p is not MAGIC!!!\n", slot);
553 if(slot->state == NCR_700_SLOT_FREE) {
554 printk(KERN_ERR "53c700: SLOT %p is FREE!!!\n", slot);
557 slot->resume_offset = 0;
559 slot->state = NCR_700_SLOT_FREE;
560 slot->ITL_forw = hostdata->free_list;
561 hostdata->free_list = slot;
562 hostdata->command_slot_count--;
566 /* This routine really does very little. The command is indexed on
567 the ITL and (if tagged) the ITLQ lists in _queuecommand */
569 save_for_reselection(struct NCR_700_Host_Parameters *hostdata,
570 struct scsi_cmnd *SCp, __u32 dsp)
572 /* Its just possible that this gets executed twice */
574 struct NCR_700_command_slot *slot =
575 (struct NCR_700_command_slot *)SCp->host_scribble;
577 slot->resume_offset = dsp;
579 hostdata->state = NCR_700_HOST_FREE;
580 hostdata->cmd = NULL;
584 NCR_700_unmap(struct NCR_700_Host_Parameters *hostdata, struct scsi_cmnd *SCp,
585 struct NCR_700_command_slot *slot)
587 if(SCp->sc_data_direction != DMA_NONE &&
588 SCp->sc_data_direction != DMA_BIDIRECTIONAL)
593 NCR_700_scsi_done(struct NCR_700_Host_Parameters *hostdata,
594 struct scsi_cmnd *SCp, int result)
596 hostdata->state = NCR_700_HOST_FREE;
597 hostdata->cmd = NULL;
600 struct NCR_700_command_slot *slot =
601 (struct NCR_700_command_slot *)SCp->host_scribble;
603 dma_unmap_single(hostdata->dev, slot->pCmd,
604 sizeof(SCp->cmnd), DMA_TO_DEVICE);
605 if (slot->flags == NCR_700_FLAG_AUTOSENSE) {
606 char *cmnd = NCR_700_get_sense_cmnd(SCp->device);
608 printk(" ORIGINAL CMD %p RETURNED %d, new return is %d sense is\n",
609 SCp, SCp->cmnd[7], result);
610 scsi_print_sense("53c700", SCp);
613 dma_unmap_single(hostdata->dev, slot->dma_handle, sizeof(SCp->sense_buffer), DMA_FROM_DEVICE);
614 /* restore the old result if the request sense was
618 /* restore the original length */
619 SCp->cmd_len = cmnd[8];
621 NCR_700_unmap(hostdata, SCp, slot);
623 free_slot(slot, hostdata);
625 if(NCR_700_get_depth(SCp->device) == 0 ||
626 NCR_700_get_depth(SCp->device) > SCp->device->queue_depth)
627 printk(KERN_ERR "Invalid depth in NCR_700_scsi_done(): %d\n",
628 NCR_700_get_depth(SCp->device));
629 #endif /* NCR_700_DEBUG */
630 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) - 1);
632 SCp->host_scribble = NULL;
633 SCp->result = result;
636 printk(KERN_ERR "53c700: SCSI DONE HAS NULL SCp\n");
642 NCR_700_internal_bus_reset(struct Scsi_Host *host)
645 NCR_700_writeb(ASSERT_RST, host, SCNTL1_REG);
647 NCR_700_writeb(0, host, SCNTL1_REG);
652 NCR_700_chip_setup(struct Scsi_Host *host)
654 struct NCR_700_Host_Parameters *hostdata =
655 (struct NCR_700_Host_Parameters *)host->hostdata[0];
656 __u32 dcntl_extra = 0;
658 __u8 min_xferp = (hostdata->chip710 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
660 if(hostdata->chip710) {
661 __u8 burst_disable = 0;
662 __u8 burst_length = 0;
664 switch (hostdata->burst_length) {
666 burst_length = BURST_LENGTH_1;
669 burst_length = BURST_LENGTH_2;
672 burst_length = BURST_LENGTH_4;
675 burst_length = BURST_LENGTH_8;
678 burst_disable = BURST_DISABLE;
681 dcntl_extra = COMPAT_700_MODE;
683 NCR_700_writeb(dcntl_extra, host, DCNTL_REG);
684 NCR_700_writeb(burst_length | hostdata->dmode_extra,
685 host, DMODE_710_REG);
686 NCR_700_writeb(burst_disable | (hostdata->differential ?
687 DIFF : 0), host, CTEST7_REG);
688 NCR_700_writeb(BTB_TIMER_DISABLE, host, CTEST0_REG);
689 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY | PARITY
690 | AUTO_ATN, host, SCNTL0_REG);
692 NCR_700_writeb(BURST_LENGTH_8 | hostdata->dmode_extra,
693 host, DMODE_700_REG);
694 NCR_700_writeb(hostdata->differential ?
695 DIFF : 0, host, CTEST7_REG);
697 /* this is for 700-66, does nothing on 700 */
698 NCR_700_writeb(LAST_DIS_ENBL | ENABLE_ACTIVE_NEGATION
699 | GENERATE_RECEIVE_PARITY, host,
702 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY
703 | PARITY | AUTO_ATN, host, SCNTL0_REG);
707 NCR_700_writeb(1 << host->this_id, host, SCID_REG);
708 NCR_700_writeb(0, host, SBCL_REG);
709 NCR_700_writeb(ASYNC_OPERATION, host, SXFER_REG);
711 NCR_700_writeb(PHASE_MM_INT | SEL_TIMEOUT_INT | GROSS_ERR_INT | UX_DISC_INT
712 | RST_INT | PAR_ERR_INT | SELECT_INT, host, SIEN_REG);
714 NCR_700_writeb(ABORT_INT | INT_INST_INT | ILGL_INST_INT, host, DIEN_REG);
715 NCR_700_writeb(ENABLE_SELECT, host, SCNTL1_REG);
716 if(hostdata->clock > 75) {
717 printk(KERN_ERR "53c700: Clock speed %dMHz is too high: 75Mhz is the maximum this chip can be driven at\n", hostdata->clock);
718 /* do the best we can, but the async clock will be out
719 * of spec: sync divider 2, async divider 3 */
720 DEBUG(("53c700: sync 2 async 3\n"));
721 NCR_700_writeb(SYNC_DIV_2_0, host, SBCL_REG);
722 NCR_700_writeb(ASYNC_DIV_3_0 | dcntl_extra, host, DCNTL_REG);
723 hostdata->sync_clock = hostdata->clock/2;
724 } else if(hostdata->clock > 50 && hostdata->clock <= 75) {
725 /* sync divider 1.5, async divider 3 */
726 DEBUG(("53c700: sync 1.5 async 3\n"));
727 NCR_700_writeb(SYNC_DIV_1_5, host, SBCL_REG);
728 NCR_700_writeb(ASYNC_DIV_3_0 | dcntl_extra, host, DCNTL_REG);
729 hostdata->sync_clock = hostdata->clock*2;
730 hostdata->sync_clock /= 3;
732 } else if(hostdata->clock > 37 && hostdata->clock <= 50) {
733 /* sync divider 1, async divider 2 */
734 DEBUG(("53c700: sync 1 async 2\n"));
735 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
736 NCR_700_writeb(ASYNC_DIV_2_0 | dcntl_extra, host, DCNTL_REG);
737 hostdata->sync_clock = hostdata->clock;
738 } else if(hostdata->clock > 25 && hostdata->clock <=37) {
739 /* sync divider 1, async divider 1.5 */
740 DEBUG(("53c700: sync 1 async 1.5\n"));
741 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
742 NCR_700_writeb(ASYNC_DIV_1_5 | dcntl_extra, host, DCNTL_REG);
743 hostdata->sync_clock = hostdata->clock;
745 DEBUG(("53c700: sync 1 async 1\n"));
746 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
747 NCR_700_writeb(ASYNC_DIV_1_0 | dcntl_extra, host, DCNTL_REG);
748 /* sync divider 1, async divider 1 */
749 hostdata->sync_clock = hostdata->clock;
751 /* Calculate the actual minimum period that can be supported
752 * by our synchronous clock speed. See the 710 manual for
753 * exact details of this calculation which is based on a
754 * setting of the SXFER register */
755 min_period = 1000*(4+min_xferp)/(4*hostdata->sync_clock);
756 hostdata->min_period = NCR_700_MIN_PERIOD;
757 if(min_period > NCR_700_MIN_PERIOD)
758 hostdata->min_period = min_period;
762 NCR_700_chip_reset(struct Scsi_Host *host)
764 struct NCR_700_Host_Parameters *hostdata =
765 (struct NCR_700_Host_Parameters *)host->hostdata[0];
766 if(hostdata->chip710) {
767 NCR_700_writeb(SOFTWARE_RESET_710, host, ISTAT_REG);
770 NCR_700_writeb(0, host, ISTAT_REG);
772 NCR_700_writeb(SOFTWARE_RESET, host, DCNTL_REG);
775 NCR_700_writeb(0, host, DCNTL_REG);
780 NCR_700_chip_setup(host);
783 /* The heart of the message processing engine is that the instruction
784 * immediately after the INT is the normal case (and so must be CLEAR
785 * ACK). If we want to do something else, we call that routine in
786 * scripts and set temp to be the normal case + 8 (skipping the CLEAR
787 * ACK) so that the routine returns correctly to resume its activity
790 process_extended_message(struct Scsi_Host *host,
791 struct NCR_700_Host_Parameters *hostdata,
792 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
794 __u32 resume_offset = dsp, temp = dsp + 8;
795 __u8 pun = 0xff, lun = 0xff;
798 pun = SCp->device->id;
799 lun = SCp->device->lun;
802 switch(hostdata->msgin[2]) {
804 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
805 struct scsi_target *starget = SCp->device->sdev_target;
806 __u8 period = hostdata->msgin[3];
807 __u8 offset = hostdata->msgin[4];
809 if(offset == 0 || period == 0) {
814 spi_offset(starget) = offset;
815 spi_period(starget) = period;
817 if(NCR_700_is_flag_set(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION)) {
818 spi_display_xfer_agreement(starget);
819 NCR_700_clear_flag(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION);
822 NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
823 NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
825 NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
829 /* SDTR message out of the blue, reject it */
830 shost_printk(KERN_WARNING, host,
831 "Unexpected SDTR msg\n");
832 hostdata->msgout[0] = A_REJECT_MSG;
833 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
834 script_patch_16(hostdata->dev, hostdata->script,
836 /* SendMsgOut returns, so set up the return
838 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
843 printk(KERN_INFO "scsi%d: (%d:%d), Unsolicited WDTR after CMD, Rejecting\n",
844 host->host_no, pun, lun);
845 hostdata->msgout[0] = A_REJECT_MSG;
846 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
847 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
849 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
854 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
855 host->host_no, pun, lun,
856 NCR_700_phase[(dsps & 0xf00) >> 8]);
857 spi_print_msg(hostdata->msgin);
860 hostdata->msgout[0] = A_REJECT_MSG;
861 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
862 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
864 /* SendMsgOut returns, so set up the return
866 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
868 NCR_700_writel(temp, host, TEMP_REG);
869 return resume_offset;
873 process_message(struct Scsi_Host *host, struct NCR_700_Host_Parameters *hostdata,
874 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
876 /* work out where to return to */
877 __u32 temp = dsp + 8, resume_offset = dsp;
878 __u8 pun = 0xff, lun = 0xff;
881 pun = SCp->device->id;
882 lun = SCp->device->lun;
886 printk("scsi%d (%d:%d): message %s: ", host->host_no, pun, lun,
887 NCR_700_phase[(dsps & 0xf00) >> 8]);
888 spi_print_msg(hostdata->msgin);
892 switch(hostdata->msgin[0]) {
895 resume_offset = process_extended_message(host, hostdata, SCp,
900 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
901 /* Rejected our sync negotiation attempt */
902 spi_period(SCp->device->sdev_target) =
903 spi_offset(SCp->device->sdev_target) = 0;
904 NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
905 NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
906 } else if(SCp != NULL && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION) {
907 /* rejected our first simple tag message */
908 scmd_printk(KERN_WARNING, SCp,
909 "Rejected first tag queue attempt, turning off tag queueing\n");
910 /* we're done negotiating */
911 NCR_700_set_tag_neg_state(SCp->device, NCR_700_FINISHED_TAG_NEGOTIATION);
912 hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
913 SCp->device->tagged_supported = 0;
914 scsi_deactivate_tcq(SCp->device, host->cmd_per_lun);
916 shost_printk(KERN_WARNING, host,
917 "(%d:%d) Unexpected REJECT Message %s\n",
919 NCR_700_phase[(dsps & 0xf00) >> 8]);
920 /* however, just ignore it */
924 case A_PARITY_ERROR_MSG:
925 printk(KERN_ERR "scsi%d (%d:%d) Parity Error!\n", host->host_no,
927 NCR_700_internal_bus_reset(host);
929 case A_SIMPLE_TAG_MSG:
930 printk(KERN_INFO "scsi%d (%d:%d) SIMPLE TAG %d %s\n", host->host_no,
931 pun, lun, hostdata->msgin[1],
932 NCR_700_phase[(dsps & 0xf00) >> 8]);
936 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
937 host->host_no, pun, lun,
938 NCR_700_phase[(dsps & 0xf00) >> 8]);
940 spi_print_msg(hostdata->msgin);
943 hostdata->msgout[0] = A_REJECT_MSG;
944 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
945 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
947 /* SendMsgOut returns, so set up the return
949 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
953 NCR_700_writel(temp, host, TEMP_REG);
954 /* set us up to receive another message */
955 dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
956 return resume_offset;
960 process_script_interrupt(__u32 dsps, __u32 dsp, struct scsi_cmnd *SCp,
961 struct Scsi_Host *host,
962 struct NCR_700_Host_Parameters *hostdata)
964 __u32 resume_offset = 0;
965 __u8 pun = 0xff, lun=0xff;
968 pun = SCp->device->id;
969 lun = SCp->device->lun;
972 if(dsps == A_GOOD_STATUS_AFTER_STATUS) {
973 DEBUG((" COMMAND COMPLETE, status=%02x\n",
974 hostdata->status[0]));
975 /* OK, if TCQ still under negotiation, we now know it works */
976 if (NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION)
977 NCR_700_set_tag_neg_state(SCp->device,
978 NCR_700_FINISHED_TAG_NEGOTIATION);
980 /* check for contingent allegiance contitions */
981 if(status_byte(hostdata->status[0]) == CHECK_CONDITION ||
982 status_byte(hostdata->status[0]) == COMMAND_TERMINATED) {
983 struct NCR_700_command_slot *slot =
984 (struct NCR_700_command_slot *)SCp->host_scribble;
985 if(slot->flags == NCR_700_FLAG_AUTOSENSE) {
986 /* OOPS: bad device, returning another
987 * contingent allegiance condition */
988 scmd_printk(KERN_ERR, SCp,
989 "broken device is looping in contingent allegiance: ignoring\n");
990 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
993 NCR_700_get_sense_cmnd(SCp->device);
995 scsi_print_command(SCp);
996 printk(" cmd %p has status %d, requesting sense\n",
997 SCp, hostdata->status[0]);
999 /* we can destroy the command here
1000 * because the contingent allegiance
1001 * condition will cause a retry which
1002 * will re-copy the command from the
1003 * saved data_cmnd. We also unmap any
1004 * data associated with the command
1006 NCR_700_unmap(hostdata, SCp, slot);
1007 dma_unmap_single(hostdata->dev, slot->pCmd,
1011 cmnd[0] = REQUEST_SENSE;
1012 cmnd[1] = (SCp->device->lun & 0x7) << 5;
1015 cmnd[4] = sizeof(SCp->sense_buffer);
1017 /* Here's a quiet hack: the
1018 * REQUEST_SENSE command is six bytes,
1019 * so store a flag indicating that
1020 * this was an internal sense request
1021 * and the original status at the end
1023 cmnd[6] = NCR_700_INTERNAL_SENSE_MAGIC;
1024 cmnd[7] = hostdata->status[0];
1025 cmnd[8] = SCp->cmd_len;
1026 SCp->cmd_len = 6; /* command length for
1028 slot->pCmd = dma_map_single(hostdata->dev, cmnd, MAX_COMMAND_SIZE, DMA_TO_DEVICE);
1029 slot->dma_handle = dma_map_single(hostdata->dev, SCp->sense_buffer, sizeof(SCp->sense_buffer), DMA_FROM_DEVICE);
1030 slot->SG[0].ins = bS_to_host(SCRIPT_MOVE_DATA_IN | sizeof(SCp->sense_buffer));
1031 slot->SG[0].pAddr = bS_to_host(slot->dma_handle);
1032 slot->SG[1].ins = bS_to_host(SCRIPT_RETURN);
1033 slot->SG[1].pAddr = 0;
1034 slot->resume_offset = hostdata->pScript;
1035 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG[0])*2, DMA_TO_DEVICE);
1036 dma_cache_sync(hostdata->dev, SCp->sense_buffer, sizeof(SCp->sense_buffer), DMA_FROM_DEVICE);
1038 /* queue the command for reissue */
1039 slot->state = NCR_700_SLOT_QUEUED;
1040 slot->flags = NCR_700_FLAG_AUTOSENSE;
1041 hostdata->state = NCR_700_HOST_FREE;
1042 hostdata->cmd = NULL;
1045 // Currently rely on the mid layer evaluation
1046 // of the tag queuing capability
1048 //if(status_byte(hostdata->status[0]) == GOOD &&
1049 // SCp->cmnd[0] == INQUIRY && SCp->use_sg == 0) {
1050 // /* Piggy back the tag queueing support
1051 // * on this command */
1052 // dma_sync_single_for_cpu(hostdata->dev,
1053 // slot->dma_handle,
1054 // SCp->request_bufflen,
1055 // DMA_FROM_DEVICE);
1056 // if(((char *)SCp->request_buffer)[7] & 0x02) {
1057 // scmd_printk(KERN_INFO, SCp,
1058 // "Enabling Tag Command Queuing\n");
1059 // hostdata->tag_negotiated |= (1<<scmd_id(SCp));
1060 // NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1062 // NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1063 // hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
1066 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
1068 } else if((dsps & 0xfffff0f0) == A_UNEXPECTED_PHASE) {
1069 __u8 i = (dsps & 0xf00) >> 8;
1071 scmd_printk(KERN_ERR, SCp, "UNEXPECTED PHASE %s (%s)\n",
1073 sbcl_to_string(NCR_700_readb(host, SBCL_REG)));
1074 scmd_printk(KERN_ERR, SCp, " len = %d, cmd =",
1076 scsi_print_command(SCp);
1078 NCR_700_internal_bus_reset(host);
1079 } else if((dsps & 0xfffff000) == A_FATAL) {
1080 int i = (dsps & 0xfff);
1082 printk(KERN_ERR "scsi%d: (%d:%d) FATAL ERROR: %s\n",
1083 host->host_no, pun, lun, NCR_700_fatal_messages[i]);
1084 if(dsps == A_FATAL_ILLEGAL_MSG_LENGTH) {
1085 printk(KERN_ERR " msg begins %02x %02x\n",
1086 hostdata->msgin[0], hostdata->msgin[1]);
1088 NCR_700_internal_bus_reset(host);
1089 } else if((dsps & 0xfffff0f0) == A_DISCONNECT) {
1090 #ifdef NCR_700_DEBUG
1091 __u8 i = (dsps & 0xf00) >> 8;
1093 printk("scsi%d: (%d:%d), DISCONNECTED (%d) %s\n",
1094 host->host_no, pun, lun,
1095 i, NCR_700_phase[i]);
1097 save_for_reselection(hostdata, SCp, dsp);
1099 } else if(dsps == A_RESELECTION_IDENTIFIED) {
1101 struct NCR_700_command_slot *slot;
1102 __u8 reselection_id = hostdata->reselection_id;
1103 struct scsi_device *SDp;
1105 lun = hostdata->msgin[0] & 0x1f;
1107 hostdata->reselection_id = 0xff;
1108 DEBUG(("scsi%d: (%d:%d) RESELECTED!\n",
1109 host->host_no, reselection_id, lun));
1110 /* clear the reselection indicator */
1111 SDp = __scsi_device_lookup(host, 0, reselection_id, lun);
1112 if(unlikely(SDp == NULL)) {
1113 printk(KERN_ERR "scsi%d: (%d:%d) HAS NO device\n",
1114 host->host_no, reselection_id, lun);
1117 if(hostdata->msgin[1] == A_SIMPLE_TAG_MSG) {
1118 struct scsi_cmnd *SCp = scsi_find_tag(SDp, hostdata->msgin[2]);
1119 if(unlikely(SCp == NULL)) {
1120 printk(KERN_ERR "scsi%d: (%d:%d) no saved request for tag %d\n",
1121 host->host_no, reselection_id, lun, hostdata->msgin[2]);
1125 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1126 DDEBUG(KERN_DEBUG, SDp,
1127 "reselection is tag %d, slot %p(%d)\n",
1128 hostdata->msgin[2], slot, slot->tag);
1130 struct scsi_cmnd *SCp = scsi_find_tag(SDp, SCSI_NO_TAG);
1131 if(unlikely(SCp == NULL)) {
1132 sdev_printk(KERN_ERR, SDp,
1133 "no saved request for untagged cmd\n");
1136 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1140 printk(KERN_ERR "scsi%d: (%d:%d) RESELECTED but no saved command (MSG = %02x %02x %02x)!!\n",
1141 host->host_no, reselection_id, lun,
1142 hostdata->msgin[0], hostdata->msgin[1],
1143 hostdata->msgin[2]);
1145 if(hostdata->state != NCR_700_HOST_BUSY)
1146 printk(KERN_ERR "scsi%d: FATAL, host not busy during valid reselection!\n",
1148 resume_offset = slot->resume_offset;
1149 hostdata->cmd = slot->cmnd;
1151 /* re-patch for this command */
1152 script_patch_32_abs(hostdata->dev, hostdata->script,
1153 CommandAddress, slot->pCmd);
1154 script_patch_16(hostdata->dev, hostdata->script,
1155 CommandCount, slot->cmnd->cmd_len);
1156 script_patch_32_abs(hostdata->dev, hostdata->script,
1157 SGScriptStartAddress,
1158 to32bit(&slot->pSG[0].ins));
1160 /* Note: setting SXFER only works if we're
1161 * still in the MESSAGE phase, so it is vital
1162 * that ACK is still asserted when we process
1163 * the reselection message. The resume offset
1164 * should therefore always clear ACK */
1165 NCR_700_writeb(NCR_700_get_SXFER(hostdata->cmd->device),
1167 dma_cache_sync(hostdata->dev, hostdata->msgin,
1168 MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
1169 dma_cache_sync(hostdata->dev, hostdata->msgout,
1170 MSG_ARRAY_SIZE, DMA_TO_DEVICE);
1171 /* I'm just being paranoid here, the command should
1172 * already have been flushed from the cache */
1173 dma_cache_sync(hostdata->dev, slot->cmnd->cmnd,
1174 slot->cmnd->cmd_len, DMA_TO_DEVICE);
1179 } else if(dsps == A_RESELECTED_DURING_SELECTION) {
1181 /* This section is full of debugging code because I've
1182 * never managed to reach it. I think what happens is
1183 * that, because the 700 runs with selection
1184 * interrupts enabled the whole time that we take a
1185 * selection interrupt before we manage to get to the
1186 * reselected script interrupt */
1188 __u8 reselection_id = NCR_700_readb(host, SFBR_REG);
1189 struct NCR_700_command_slot *slot;
1191 /* Take out our own ID */
1192 reselection_id &= ~(1<<host->this_id);
1194 /* I've never seen this happen, so keep this as a printk rather
1196 printk(KERN_INFO "scsi%d: (%d:%d) RESELECTION DURING SELECTION, dsp=%08x[%04x] state=%d, count=%d\n",
1197 host->host_no, reselection_id, lun, dsp, dsp - hostdata->pScript, hostdata->state, hostdata->command_slot_count);
1200 /* FIXME: DEBUGGING CODE */
1201 __u32 SG = (__u32)bS_to_cpu(hostdata->script[A_SGScriptStartAddress_used[0]]);
1204 for(i=0; i< NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1205 if(SG >= to32bit(&hostdata->slots[i].pSG[0])
1206 && SG <= to32bit(&hostdata->slots[i].pSG[NCR_700_SG_SEGMENTS]))
1209 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);
1210 SCp = hostdata->slots[i].cmnd;
1214 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1215 /* change slot from busy to queued to redo command */
1216 slot->state = NCR_700_SLOT_QUEUED;
1218 hostdata->cmd = NULL;
1220 if(reselection_id == 0) {
1221 if(hostdata->reselection_id == 0xff) {
1222 printk(KERN_ERR "scsi%d: Invalid reselection during selection!!\n", host->host_no);
1225 printk(KERN_ERR "scsi%d: script reselected and we took a selection interrupt\n",
1227 reselection_id = hostdata->reselection_id;
1231 /* convert to real ID */
1232 reselection_id = bitmap_to_number(reselection_id);
1234 hostdata->reselection_id = reselection_id;
1235 /* just in case we have a stale simple tag message, clear it */
1236 hostdata->msgin[1] = 0;
1237 dma_cache_sync(hostdata->dev, hostdata->msgin,
1238 MSG_ARRAY_SIZE, DMA_BIDIRECTIONAL);
1239 if(hostdata->tag_negotiated & (1<<reselection_id)) {
1240 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1242 resume_offset = hostdata->pScript + Ent_GetReselectionData;
1244 } else if(dsps == A_COMPLETED_SELECTION_AS_TARGET) {
1245 /* we've just disconnected from the bus, do nothing since
1246 * a return here will re-run the queued command slot
1247 * that may have been interrupted by the initial selection */
1248 DEBUG((" SELECTION COMPLETED\n"));
1249 } else if((dsps & 0xfffff0f0) == A_MSG_IN) {
1250 resume_offset = process_message(host, hostdata, SCp,
1252 } else if((dsps & 0xfffff000) == 0) {
1253 __u8 i = (dsps & 0xf0) >> 4, j = (dsps & 0xf00) >> 8;
1254 printk(KERN_ERR "scsi%d: (%d:%d), unhandled script condition %s %s at %04x\n",
1255 host->host_no, pun, lun, NCR_700_condition[i],
1256 NCR_700_phase[j], dsp - hostdata->pScript);
1258 struct scatterlist *sg;
1260 scsi_print_command(SCp);
1261 scsi_for_each_sg(SCp, sg, scsi_sg_count(SCp) + 1, i) {
1262 printk(KERN_INFO " SG[%d].length = %d, move_insn=%08x, addr %08x\n", i, sg->length, ((struct NCR_700_command_slot *)SCp->host_scribble)->SG[i].ins, ((struct NCR_700_command_slot *)SCp->host_scribble)->SG[i].pAddr);
1265 NCR_700_internal_bus_reset(host);
1266 } else if((dsps & 0xfffff000) == A_DEBUG_INTERRUPT) {
1267 printk(KERN_NOTICE "scsi%d (%d:%d) DEBUG INTERRUPT %d AT %08x[%04x], continuing\n",
1268 host->host_no, pun, lun, dsps & 0xfff, dsp, dsp - hostdata->pScript);
1269 resume_offset = dsp;
1271 printk(KERN_ERR "scsi%d: (%d:%d), unidentified script interrupt 0x%x at %04x\n",
1272 host->host_no, pun, lun, dsps, dsp - hostdata->pScript);
1273 NCR_700_internal_bus_reset(host);
1275 return resume_offset;
1278 /* We run the 53c700 with selection interrupts always enabled. This
1279 * means that the chip may be selected as soon as the bus frees. On a
1280 * busy bus, this can be before the scripts engine finishes its
1281 * processing. Therefore, part of the selection processing has to be
1282 * to find out what the scripts engine is doing and complete the
1283 * function if necessary (i.e. process the pending disconnect or save
1284 * the interrupted initial selection */
1286 process_selection(struct Scsi_Host *host, __u32 dsp)
1288 __u8 id = 0; /* Squash compiler warning */
1290 __u32 resume_offset = 0;
1291 struct NCR_700_Host_Parameters *hostdata =
1292 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1293 struct scsi_cmnd *SCp = hostdata->cmd;
1296 for(count = 0; count < 5; count++) {
1297 id = NCR_700_readb(host, hostdata->chip710 ?
1298 CTEST9_REG : SFBR_REG);
1300 /* Take out our own ID */
1301 id &= ~(1<<host->this_id);
1306 sbcl = NCR_700_readb(host, SBCL_REG);
1307 if((sbcl & SBCL_IO) == 0) {
1308 /* mark as having been selected rather than reselected */
1311 /* convert to real ID */
1312 hostdata->reselection_id = id = bitmap_to_number(id);
1313 DEBUG(("scsi%d: Reselected by %d\n",
1314 host->host_no, id));
1316 if(hostdata->state == NCR_700_HOST_BUSY && SCp != NULL) {
1317 struct NCR_700_command_slot *slot =
1318 (struct NCR_700_command_slot *)SCp->host_scribble;
1319 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));
1321 switch(dsp - hostdata->pScript) {
1322 case Ent_Disconnect1:
1323 case Ent_Disconnect2:
1324 save_for_reselection(hostdata, SCp, Ent_Disconnect2 + hostdata->pScript);
1326 case Ent_Disconnect3:
1327 case Ent_Disconnect4:
1328 save_for_reselection(hostdata, SCp, Ent_Disconnect4 + hostdata->pScript);
1330 case Ent_Disconnect5:
1331 case Ent_Disconnect6:
1332 save_for_reselection(hostdata, SCp, Ent_Disconnect6 + hostdata->pScript);
1334 case Ent_Disconnect7:
1335 case Ent_Disconnect8:
1336 save_for_reselection(hostdata, SCp, Ent_Disconnect8 + hostdata->pScript);
1340 process_script_interrupt(A_GOOD_STATUS_AFTER_STATUS, dsp, SCp, host, hostdata);
1344 slot->state = NCR_700_SLOT_QUEUED;
1348 hostdata->state = NCR_700_HOST_BUSY;
1349 hostdata->cmd = NULL;
1350 /* clear any stale simple tag message */
1351 hostdata->msgin[1] = 0;
1352 dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE,
1356 /* Selected as target, Ignore */
1357 resume_offset = hostdata->pScript + Ent_SelectedAsTarget;
1358 } else if(hostdata->tag_negotiated & (1<<id)) {
1359 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1361 resume_offset = hostdata->pScript + Ent_GetReselectionData;
1363 return resume_offset;
1367 NCR_700_clear_fifo(struct Scsi_Host *host) {
1368 const struct NCR_700_Host_Parameters *hostdata
1369 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1370 if(hostdata->chip710) {
1371 NCR_700_writeb(CLR_FIFO_710, host, CTEST8_REG);
1373 NCR_700_writeb(CLR_FIFO, host, DFIFO_REG);
1378 NCR_700_flush_fifo(struct Scsi_Host *host) {
1379 const struct NCR_700_Host_Parameters *hostdata
1380 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1381 if(hostdata->chip710) {
1382 NCR_700_writeb(FLUSH_DMA_FIFO_710, host, CTEST8_REG);
1384 NCR_700_writeb(0, host, CTEST8_REG);
1386 NCR_700_writeb(FLUSH_DMA_FIFO, host, DFIFO_REG);
1388 NCR_700_writeb(0, host, DFIFO_REG);
1393 /* The queue lock with interrupts disabled must be held on entry to
1396 NCR_700_start_command(struct scsi_cmnd *SCp)
1398 struct NCR_700_command_slot *slot =
1399 (struct NCR_700_command_slot *)SCp->host_scribble;
1400 struct NCR_700_Host_Parameters *hostdata =
1401 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1402 __u16 count = 1; /* for IDENTIFY message */
1404 if(hostdata->state != NCR_700_HOST_FREE) {
1405 /* keep this inside the lock to close the race window where
1406 * the running command finishes on another CPU while we don't
1407 * change the state to queued on this one */
1408 slot->state = NCR_700_SLOT_QUEUED;
1410 DEBUG(("scsi%d: host busy, queueing command %p, slot %p\n",
1411 SCp->device->host->host_no, slot->cmnd, slot));
1414 hostdata->state = NCR_700_HOST_BUSY;
1415 hostdata->cmd = SCp;
1416 slot->state = NCR_700_SLOT_BUSY;
1417 /* keep interrupts disabled until we have the command correctly
1418 * set up so we cannot take a selection interrupt */
1420 hostdata->msgout[0] = NCR_700_identify((SCp->cmnd[0] != REQUEST_SENSE &&
1421 slot->flags != NCR_700_FLAG_AUTOSENSE),
1423 /* for INQUIRY or REQUEST_SENSE commands, we cannot be sure
1424 * if the negotiated transfer parameters still hold, so
1425 * always renegotiate them */
1426 if(SCp->cmnd[0] == INQUIRY || SCp->cmnd[0] == REQUEST_SENSE ||
1427 slot->flags == NCR_700_FLAG_AUTOSENSE) {
1428 NCR_700_clear_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
1431 /* REQUEST_SENSE is asking for contingent I_T_L(_Q) status.
1432 * If a contingent allegiance condition exists, the device
1433 * will refuse all tags, so send the request sense as untagged
1435 if((hostdata->tag_negotiated & (1<<scmd_id(SCp)))
1436 && (slot->tag != SCSI_NO_TAG && SCp->cmnd[0] != REQUEST_SENSE &&
1437 slot->flags != NCR_700_FLAG_AUTOSENSE)) {
1438 count += scsi_populate_tag_msg(SCp, &hostdata->msgout[count]);
1441 if(hostdata->fast &&
1442 NCR_700_is_flag_clear(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC)) {
1443 count += spi_populate_sync_msg(&hostdata->msgout[count],
1444 spi_period(SCp->device->sdev_target),
1445 spi_offset(SCp->device->sdev_target));
1446 NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
1449 script_patch_16(hostdata->dev, hostdata->script, MessageCount, count);
1452 script_patch_ID(hostdata->dev, hostdata->script,
1453 Device_ID, 1<<scmd_id(SCp));
1455 script_patch_32_abs(hostdata->dev, hostdata->script, CommandAddress,
1457 script_patch_16(hostdata->dev, hostdata->script, CommandCount,
1459 /* finally plumb the beginning of the SG list into the script
1461 script_patch_32_abs(hostdata->dev, hostdata->script,
1462 SGScriptStartAddress, to32bit(&slot->pSG[0].ins));
1463 NCR_700_clear_fifo(SCp->device->host);
1465 if(slot->resume_offset == 0)
1466 slot->resume_offset = hostdata->pScript;
1467 /* now perform all the writebacks and invalidates */
1468 dma_cache_sync(hostdata->dev, hostdata->msgout, count, DMA_TO_DEVICE);
1469 dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE,
1471 dma_cache_sync(hostdata->dev, SCp->cmnd, SCp->cmd_len, DMA_TO_DEVICE);
1472 dma_cache_sync(hostdata->dev, hostdata->status, 1, DMA_FROM_DEVICE);
1474 /* set the synchronous period/offset */
1475 NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
1476 SCp->device->host, SXFER_REG);
1477 NCR_700_writel(slot->temp, SCp->device->host, TEMP_REG);
1478 NCR_700_writel(slot->resume_offset, SCp->device->host, DSP_REG);
1484 NCR_700_intr(int irq, void *dev_id)
1486 struct Scsi_Host *host = (struct Scsi_Host *)dev_id;
1487 struct NCR_700_Host_Parameters *hostdata =
1488 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1490 __u32 resume_offset = 0;
1491 __u8 pun = 0xff, lun = 0xff;
1492 unsigned long flags;
1495 /* Use the host lock to serialise acess to the 53c700
1496 * hardware. Note: In future, we may need to take the queue
1497 * lock to enter the done routines. When that happens, we
1498 * need to ensure that for this driver, the host lock and the
1499 * queue lock point to the same thing. */
1500 spin_lock_irqsave(host->host_lock, flags);
1501 if((istat = NCR_700_readb(host, ISTAT_REG))
1502 & (SCSI_INT_PENDING | DMA_INT_PENDING)) {
1504 __u8 sstat0 = 0, dstat = 0;
1506 struct scsi_cmnd *SCp = hostdata->cmd;
1507 enum NCR_700_Host_State state;
1510 state = hostdata->state;
1511 SCp = hostdata->cmd;
1513 if(istat & SCSI_INT_PENDING) {
1516 sstat0 = NCR_700_readb(host, SSTAT0_REG);
1519 if(istat & DMA_INT_PENDING) {
1522 dstat = NCR_700_readb(host, DSTAT_REG);
1525 dsps = NCR_700_readl(host, DSPS_REG);
1526 dsp = NCR_700_readl(host, DSP_REG);
1528 DEBUG(("scsi%d: istat %02x sstat0 %02x dstat %02x dsp %04x[%08x] dsps 0x%x\n",
1529 host->host_no, istat, sstat0, dstat,
1530 (dsp - (__u32)(hostdata->pScript))/4,
1534 pun = SCp->device->id;
1535 lun = SCp->device->lun;
1538 if(sstat0 & SCSI_RESET_DETECTED) {
1539 struct scsi_device *SDp;
1542 hostdata->state = NCR_700_HOST_BUSY;
1544 printk(KERN_ERR "scsi%d: Bus Reset detected, executing command %p, slot %p, dsp %08x[%04x]\n",
1545 host->host_no, SCp, SCp == NULL ? NULL : SCp->host_scribble, dsp, dsp - hostdata->pScript);
1547 scsi_report_bus_reset(host, 0);
1549 /* clear all the negotiated parameters */
1550 __shost_for_each_device(SDp, host)
1551 NCR_700_clear_flag(SDp, ~0);
1553 /* clear all the slots and their pending commands */
1554 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1555 struct scsi_cmnd *SCp;
1556 struct NCR_700_command_slot *slot =
1557 &hostdata->slots[i];
1559 if(slot->state == NCR_700_SLOT_FREE)
1563 printk(KERN_ERR " failing command because of reset, slot %p, cmnd %p\n",
1565 free_slot(slot, hostdata);
1566 SCp->host_scribble = NULL;
1567 NCR_700_set_depth(SCp->device, 0);
1568 /* NOTE: deadlock potential here: we
1569 * rely on mid-layer guarantees that
1570 * scsi_done won't try to issue the
1571 * command again otherwise we'll
1573 * hostdata->state_lock */
1574 SCp->result = DID_RESET << 16;
1575 SCp->scsi_done(SCp);
1578 NCR_700_chip_setup(host);
1580 hostdata->state = NCR_700_HOST_FREE;
1581 hostdata->cmd = NULL;
1582 /* signal back if this was an eh induced reset */
1583 if(hostdata->eh_complete != NULL)
1584 complete(hostdata->eh_complete);
1586 } else if(sstat0 & SELECTION_TIMEOUT) {
1587 DEBUG(("scsi%d: (%d:%d) selection timeout\n",
1588 host->host_no, pun, lun));
1589 NCR_700_scsi_done(hostdata, SCp, DID_NO_CONNECT<<16);
1590 } else if(sstat0 & PHASE_MISMATCH) {
1591 struct NCR_700_command_slot *slot = (SCp == NULL) ? NULL :
1592 (struct NCR_700_command_slot *)SCp->host_scribble;
1594 if(dsp == Ent_SendMessage + 8 + hostdata->pScript) {
1595 /* It wants to reply to some part of
1597 #ifdef NCR_700_DEBUG
1598 __u32 temp = NCR_700_readl(host, TEMP_REG);
1599 int count = (hostdata->script[Ent_SendMessage/4] & 0xffffff) - ((NCR_700_readl(host, DBC_REG) & 0xffffff) + NCR_700_data_residual(host));
1600 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)));
1602 resume_offset = hostdata->pScript + Ent_SendMessagePhaseMismatch;
1603 } else if(dsp >= to32bit(&slot->pSG[0].ins) &&
1604 dsp <= to32bit(&slot->pSG[NCR_700_SG_SEGMENTS].ins)) {
1605 int data_transfer = NCR_700_readl(host, DBC_REG) & 0xffffff;
1606 int SGcount = (dsp - to32bit(&slot->pSG[0].ins))/sizeof(struct NCR_700_SG_List);
1607 int residual = NCR_700_data_residual(host);
1609 #ifdef NCR_700_DEBUG
1610 __u32 naddr = NCR_700_readl(host, DNAD_REG);
1612 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x\n",
1613 host->host_no, pun, lun,
1614 SGcount, data_transfer);
1615 scsi_print_command(SCp);
1617 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x, residual %d\n",
1618 host->host_no, pun, lun,
1619 SGcount, data_transfer, residual);
1622 data_transfer += residual;
1624 if(data_transfer != 0) {
1630 count = (bS_to_cpu(slot->SG[SGcount].ins) & 0x00ffffff);
1631 DEBUG(("DATA TRANSFER MISMATCH, count = %d, transferred %d\n", count, count-data_transfer));
1632 slot->SG[SGcount].ins &= bS_to_host(0xff000000);
1633 slot->SG[SGcount].ins |= bS_to_host(data_transfer);
1634 pAddr = bS_to_cpu(slot->SG[SGcount].pAddr);
1635 pAddr += (count - data_transfer);
1636 #ifdef NCR_700_DEBUG
1637 if(pAddr != naddr) {
1638 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);
1641 slot->SG[SGcount].pAddr = bS_to_host(pAddr);
1643 /* set the executed moves to nops */
1644 for(i=0; i<SGcount; i++) {
1645 slot->SG[i].ins = bS_to_host(SCRIPT_NOP);
1646 slot->SG[i].pAddr = 0;
1648 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1649 /* and pretend we disconnected after
1650 * the command phase */
1651 resume_offset = hostdata->pScript + Ent_MsgInDuringData;
1652 /* make sure all the data is flushed */
1653 NCR_700_flush_fifo(host);
1655 __u8 sbcl = NCR_700_readb(host, SBCL_REG);
1656 printk(KERN_ERR "scsi%d: (%d:%d) phase mismatch at %04x, phase %s\n",
1657 host->host_no, pun, lun, dsp - hostdata->pScript, sbcl_to_string(sbcl));
1658 NCR_700_internal_bus_reset(host);
1661 } else if(sstat0 & SCSI_GROSS_ERROR) {
1662 printk(KERN_ERR "scsi%d: (%d:%d) GROSS ERROR\n",
1663 host->host_no, pun, lun);
1664 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1665 } else if(sstat0 & PARITY_ERROR) {
1666 printk(KERN_ERR "scsi%d: (%d:%d) PARITY ERROR\n",
1667 host->host_no, pun, lun);
1668 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1669 } else if(dstat & SCRIPT_INT_RECEIVED) {
1670 DEBUG(("scsi%d: (%d:%d) ====>SCRIPT INTERRUPT<====\n",
1671 host->host_no, pun, lun));
1672 resume_offset = process_script_interrupt(dsps, dsp, SCp, host, hostdata);
1673 } else if(dstat & (ILGL_INST_DETECTED)) {
1674 printk(KERN_ERR "scsi%d: (%d:%d) Illegal Instruction detected at 0x%08x[0x%x]!!!\n"
1675 " Please email James.Bottomley@HansenPartnership.com with the details\n",
1676 host->host_no, pun, lun,
1677 dsp, dsp - hostdata->pScript);
1678 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1679 } else if(dstat & (WATCH_DOG_INTERRUPT|ABORTED)) {
1680 printk(KERN_ERR "scsi%d: (%d:%d) serious DMA problem, dstat=%02x\n",
1681 host->host_no, pun, lun, dstat);
1682 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1686 /* NOTE: selection interrupt processing MUST occur
1687 * after script interrupt processing to correctly cope
1688 * with the case where we process a disconnect and
1689 * then get reselected before we process the
1691 if(sstat0 & SELECTED) {
1692 /* FIXME: It currently takes at least FOUR
1693 * interrupts to complete a command that
1694 * disconnects: one for the disconnect, one
1695 * for the reselection, one to get the
1696 * reselection data and one to complete the
1697 * command. If we guess the reselected
1698 * command here and prepare it, we only need
1699 * to get a reselection data interrupt if we
1700 * guessed wrongly. Since the interrupt
1701 * overhead is much greater than the command
1702 * setup, this would be an efficient
1703 * optimisation particularly as we probably
1704 * only have one outstanding command on a
1705 * target most of the time */
1707 resume_offset = process_selection(host, dsp);
1714 if(hostdata->state != NCR_700_HOST_BUSY) {
1715 printk(KERN_ERR "scsi%d: Driver error: resume at 0x%08x [0x%04x] with non busy host!\n",
1716 host->host_no, resume_offset, resume_offset - hostdata->pScript);
1717 hostdata->state = NCR_700_HOST_BUSY;
1720 DEBUG(("Attempting to resume at %x\n", resume_offset));
1721 NCR_700_clear_fifo(host);
1722 NCR_700_writel(resume_offset, host, DSP_REG);
1724 /* There is probably a technical no-no about this: If we're a
1725 * shared interrupt and we got this interrupt because the
1726 * other device needs servicing not us, we're still going to
1727 * check our queued commands here---of course, there shouldn't
1728 * be any outstanding.... */
1729 if(hostdata->state == NCR_700_HOST_FREE) {
1732 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1733 /* fairness: always run the queue from the last
1734 * position we left off */
1735 int j = (i + hostdata->saved_slot_position)
1736 % NCR_700_COMMAND_SLOTS_PER_HOST;
1738 if(hostdata->slots[j].state != NCR_700_SLOT_QUEUED)
1740 if(NCR_700_start_command(hostdata->slots[j].cmnd)) {
1741 DEBUG(("scsi%d: Issuing saved command slot %p, cmd %p\t\n",
1742 host->host_no, &hostdata->slots[j],
1743 hostdata->slots[j].cmnd));
1744 hostdata->saved_slot_position = j + 1;
1751 spin_unlock_irqrestore(host->host_lock, flags);
1752 return IRQ_RETVAL(handled);
1756 NCR_700_queuecommand(struct scsi_cmnd *SCp, void (*done)(struct scsi_cmnd *))
1758 struct NCR_700_Host_Parameters *hostdata =
1759 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1761 enum dma_data_direction direction;
1762 struct NCR_700_command_slot *slot;
1764 if(hostdata->command_slot_count >= NCR_700_COMMAND_SLOTS_PER_HOST) {
1765 /* We're over our allocation, this should never happen
1766 * since we report the max allocation to the mid layer */
1767 printk(KERN_WARNING "scsi%d: Command depth has gone over queue depth\n", SCp->device->host->host_no);
1770 /* check for untagged commands. We cannot have any outstanding
1771 * commands if we accept them. Commands could be untagged because:
1773 * - The tag negotiated bitmap is clear
1774 * - The blk layer sent and untagged command
1776 if(NCR_700_get_depth(SCp->device) != 0
1777 && (!(hostdata->tag_negotiated & (1<<scmd_id(SCp)))
1778 || !blk_rq_tagged(SCp->request))) {
1779 CDEBUG(KERN_ERR, SCp, "has non zero depth %d\n",
1780 NCR_700_get_depth(SCp->device));
1781 return SCSI_MLQUEUE_DEVICE_BUSY;
1783 if(NCR_700_get_depth(SCp->device) >= SCp->device->queue_depth) {
1784 CDEBUG(KERN_ERR, SCp, "has max tag depth %d\n",
1785 NCR_700_get_depth(SCp->device));
1786 return SCSI_MLQUEUE_DEVICE_BUSY;
1788 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) + 1);
1790 /* begin the command here */
1791 /* no need to check for NULL, test for command_slot_count above
1792 * ensures a slot is free */
1793 slot = find_empty_slot(hostdata);
1797 SCp->scsi_done = done;
1798 SCp->host_scribble = (unsigned char *)slot;
1799 SCp->SCp.ptr = NULL;
1800 SCp->SCp.buffer = NULL;
1802 #ifdef NCR_700_DEBUG
1803 printk("53c700: scsi%d, command ", SCp->device->host->host_no);
1804 scsi_print_command(SCp);
1806 if(blk_rq_tagged(SCp->request)
1807 && (hostdata->tag_negotiated &(1<<scmd_id(SCp))) == 0
1808 && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_START_TAG_NEGOTIATION) {
1809 scmd_printk(KERN_ERR, SCp, "Enabling Tag Command Queuing\n");
1810 hostdata->tag_negotiated |= (1<<scmd_id(SCp));
1811 NCR_700_set_tag_neg_state(SCp->device, NCR_700_DURING_TAG_NEGOTIATION);
1814 /* here we may have to process an untagged command. The gate
1815 * above ensures that this will be the only one outstanding,
1816 * so clear the tag negotiated bit.
1818 * FIXME: This will royally screw up on multiple LUN devices
1820 if(!blk_rq_tagged(SCp->request)
1821 && (hostdata->tag_negotiated &(1<<scmd_id(SCp)))) {
1822 scmd_printk(KERN_INFO, SCp, "Disabling Tag Command Queuing\n");
1823 hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
1826 if((hostdata->tag_negotiated &(1<<scmd_id(SCp)))
1827 && scsi_get_tag_type(SCp->device)) {
1828 slot->tag = SCp->request->tag;
1829 CDEBUG(KERN_DEBUG, SCp, "sending out tag %d, slot %p\n",
1832 slot->tag = SCSI_NO_TAG;
1833 /* must populate current_cmnd for scsi_find_tag to work */
1834 SCp->device->current_cmnd = SCp;
1836 /* sanity check: some of the commands generated by the mid-layer
1837 * have an eccentric idea of their sc_data_direction */
1838 if(!scsi_sg_count(SCp) && !scsi_bufflen(SCp) &&
1839 SCp->sc_data_direction != DMA_NONE) {
1840 #ifdef NCR_700_DEBUG
1841 printk("53c700: Command");
1842 scsi_print_command(SCp);
1843 printk("Has wrong data direction %d\n", SCp->sc_data_direction);
1845 SCp->sc_data_direction = DMA_NONE;
1848 switch (SCp->cmnd[0]) {
1850 /* clear the internal sense magic */
1854 /* OK, get it from the command */
1855 switch(SCp->sc_data_direction) {
1856 case DMA_BIDIRECTIONAL:
1858 printk(KERN_ERR "53c700: Unknown command for data direction ");
1859 scsi_print_command(SCp);
1866 case DMA_FROM_DEVICE:
1867 move_ins = SCRIPT_MOVE_DATA_IN;
1870 move_ins = SCRIPT_MOVE_DATA_OUT;
1875 /* now build the scatter gather list */
1876 direction = SCp->sc_data_direction;
1880 dma_addr_t vPtr = 0;
1881 struct scatterlist *sg;
1884 sg_count = scsi_dma_map(SCp);
1885 BUG_ON(sg_count < 0);
1887 scsi_for_each_sg(SCp, sg, sg_count, i) {
1888 vPtr = sg_dma_address(sg);
1889 count = sg_dma_len(sg);
1891 slot->SG[i].ins = bS_to_host(move_ins | count);
1892 DEBUG((" scatter block %d: move %d[%08x] from 0x%lx\n",
1893 i, count, slot->SG[i].ins, (unsigned long)vPtr));
1894 slot->SG[i].pAddr = bS_to_host(vPtr);
1896 slot->SG[i].ins = bS_to_host(SCRIPT_RETURN);
1897 slot->SG[i].pAddr = 0;
1898 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1899 DEBUG((" SETTING %08lx to %x\n",
1900 (&slot->pSG[i].ins),
1903 slot->resume_offset = 0;
1904 slot->pCmd = dma_map_single(hostdata->dev, SCp->cmnd,
1905 sizeof(SCp->cmnd), DMA_TO_DEVICE);
1906 NCR_700_start_command(SCp);
1911 NCR_700_abort(struct scsi_cmnd * SCp)
1913 struct NCR_700_command_slot *slot;
1915 scmd_printk(KERN_INFO, SCp,
1916 "New error handler wants to abort command\n\t");
1917 scsi_print_command(SCp);
1919 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1922 /* no outstanding command to abort */
1924 if(SCp->cmnd[0] == TEST_UNIT_READY) {
1925 /* FIXME: This is because of a problem in the new
1926 * error handler. When it is in error recovery, it
1927 * will send a TUR to a device it thinks may still be
1928 * showing a problem. If the TUR isn't responded to,
1929 * it will abort it and mark the device off line.
1930 * Unfortunately, it does no other error recovery, so
1931 * this would leave us with an outstanding command
1932 * occupying a slot. Rather than allow this to
1933 * happen, we issue a bus reset to force all
1934 * outstanding commands to terminate here. */
1935 NCR_700_internal_bus_reset(SCp->device->host);
1936 /* still drop through and return failed */
1943 NCR_700_bus_reset(struct scsi_cmnd * SCp)
1945 DECLARE_COMPLETION_ONSTACK(complete);
1946 struct NCR_700_Host_Parameters *hostdata =
1947 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1949 scmd_printk(KERN_INFO, SCp,
1950 "New error handler wants BUS reset, cmd %p\n\t", SCp);
1951 scsi_print_command(SCp);
1953 /* In theory, eh_complete should always be null because the
1954 * eh is single threaded, but just in case we're handling a
1955 * reset via sg or something */
1956 spin_lock_irq(SCp->device->host->host_lock);
1957 while (hostdata->eh_complete != NULL) {
1958 spin_unlock_irq(SCp->device->host->host_lock);
1959 msleep_interruptible(100);
1960 spin_lock_irq(SCp->device->host->host_lock);
1963 hostdata->eh_complete = &complete;
1964 NCR_700_internal_bus_reset(SCp->device->host);
1966 spin_unlock_irq(SCp->device->host->host_lock);
1967 wait_for_completion(&complete);
1968 spin_lock_irq(SCp->device->host->host_lock);
1970 hostdata->eh_complete = NULL;
1971 /* Revalidate the transport parameters of the failing device */
1973 spi_schedule_dv_device(SCp->device);
1975 spin_unlock_irq(SCp->device->host->host_lock);
1980 NCR_700_host_reset(struct scsi_cmnd * SCp)
1982 scmd_printk(KERN_INFO, SCp, "New error handler wants HOST reset\n\t");
1983 scsi_print_command(SCp);
1985 spin_lock_irq(SCp->device->host->host_lock);
1987 NCR_700_internal_bus_reset(SCp->device->host);
1988 NCR_700_chip_reset(SCp->device->host);
1990 spin_unlock_irq(SCp->device->host->host_lock);
1996 NCR_700_set_period(struct scsi_target *STp, int period)
1998 struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
1999 struct NCR_700_Host_Parameters *hostdata =
2000 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
2005 if(period < hostdata->min_period)
2006 period = hostdata->min_period;
2008 spi_period(STp) = period;
2009 spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2010 NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2011 spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2015 NCR_700_set_offset(struct scsi_target *STp, int offset)
2017 struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
2018 struct NCR_700_Host_Parameters *hostdata =
2019 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
2020 int max_offset = hostdata->chip710
2021 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET;
2026 if(offset > max_offset)
2027 offset = max_offset;
2029 /* if we're currently async, make sure the period is reasonable */
2030 if(spi_offset(STp) == 0 && (spi_period(STp) < hostdata->min_period ||
2031 spi_period(STp) > 0xff))
2032 spi_period(STp) = hostdata->min_period;
2034 spi_offset(STp) = offset;
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_slave_alloc(struct scsi_device *SDp)
2043 SDp->hostdata = kzalloc(sizeof(struct NCR_700_Device_Parameters),
2053 NCR_700_slave_configure(struct scsi_device *SDp)
2055 struct NCR_700_Host_Parameters *hostdata =
2056 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2058 /* to do here: allocate memory; build a queue_full list */
2059 if(SDp->tagged_supported) {
2060 scsi_set_tag_type(SDp, MSG_ORDERED_TAG);
2061 scsi_activate_tcq(SDp, NCR_700_DEFAULT_TAGS);
2062 NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2064 /* initialise to default depth */
2065 scsi_adjust_queue_depth(SDp, 0, SDp->host->cmd_per_lun);
2067 if(hostdata->fast) {
2068 /* Find the correct offset and period via domain validation */
2069 if (!spi_initial_dv(SDp->sdev_target))
2072 spi_offset(SDp->sdev_target) = 0;
2073 spi_period(SDp->sdev_target) = 0;
2079 NCR_700_slave_destroy(struct scsi_device *SDp)
2081 kfree(SDp->hostdata);
2082 SDp->hostdata = NULL;
2086 NCR_700_change_queue_depth(struct scsi_device *SDp, int depth)
2088 if (depth > NCR_700_MAX_TAGS)
2089 depth = NCR_700_MAX_TAGS;
2091 scsi_adjust_queue_depth(SDp, scsi_get_tag_type(SDp), depth);
2095 static int NCR_700_change_queue_type(struct scsi_device *SDp, int tag_type)
2097 int change_tag = ((tag_type ==0 && scsi_get_tag_type(SDp) != 0)
2098 || (tag_type != 0 && scsi_get_tag_type(SDp) == 0));
2099 struct NCR_700_Host_Parameters *hostdata =
2100 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2102 scsi_set_tag_type(SDp, tag_type);
2104 /* We have a global (per target) flag to track whether TCQ is
2105 * enabled, so we'll be turning it off for the entire target here.
2106 * our tag algorithm will fail if we mix tagged and untagged commands,
2107 * so quiesce the device before doing this */
2109 scsi_target_quiesce(SDp->sdev_target);
2112 /* shift back to the default unqueued number of commands
2113 * (the user can still raise this) */
2114 scsi_deactivate_tcq(SDp, SDp->host->cmd_per_lun);
2115 hostdata->tag_negotiated &= ~(1 << sdev_id(SDp));
2117 /* Here, we cleared the negotiation flag above, so this
2118 * will force the driver to renegotiate */
2119 scsi_activate_tcq(SDp, SDp->queue_depth);
2121 NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2124 scsi_target_resume(SDp->sdev_target);
2130 NCR_700_show_active_tags(struct device *dev, struct device_attribute *attr, char *buf)
2132 struct scsi_device *SDp = to_scsi_device(dev);
2134 return snprintf(buf, 20, "%d\n", NCR_700_get_depth(SDp));
2137 static struct device_attribute NCR_700_active_tags_attr = {
2139 .name = "active_tags",
2142 .show = NCR_700_show_active_tags,
2145 STATIC struct device_attribute *NCR_700_dev_attrs[] = {
2146 &NCR_700_active_tags_attr,
2150 EXPORT_SYMBOL(NCR_700_detect);
2151 EXPORT_SYMBOL(NCR_700_release);
2152 EXPORT_SYMBOL(NCR_700_intr);
2154 static struct spi_function_template NCR_700_transport_functions = {
2155 .set_period = NCR_700_set_period,
2157 .set_offset = NCR_700_set_offset,
2161 static int __init NCR_700_init(void)
2163 NCR_700_transport_template = spi_attach_transport(&NCR_700_transport_functions);
2164 if(!NCR_700_transport_template)
2169 static void __exit NCR_700_exit(void)
2171 spi_release_transport(NCR_700_transport_template);
2174 module_init(NCR_700_init);
2175 module_exit(NCR_700_exit);
projects / linux-2.6-omap-h63xx.git / blob