blob: ea439f93ed81132ad97cbb0885d9893160a6cf22 [file] [log] [blame]
Roman Zippelc28bda22007-05-01 22:32:36 +02001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * NCR 5380 generic driver routines. These should make it *trivial*
Roman Zippelc28bda22007-05-01 22:32:36 +02003 * to implement 5380 SCSI drivers under Linux with a non-trantor
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 * architecture.
5 *
6 * Note that these routines also work with NR53c400 family chips.
7 *
8 * Copyright 1993, Drew Eckhardt
Roman Zippelc28bda22007-05-01 22:32:36 +02009 * Visionary Computing
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 * (Unix and Linux consulting and custom programming)
Roman Zippelc28bda22007-05-01 22:32:36 +020011 * drew@colorado.edu
Linus Torvalds1da177e2005-04-16 15:20:36 -070012 * +1 (303) 666-5836
13 *
Roman Zippelc28bda22007-05-01 22:32:36 +020014 * DISTRIBUTION RELEASE 6.
Linus Torvalds1da177e2005-04-16 15:20:36 -070015 *
Roman Zippelc28bda22007-05-01 22:32:36 +020016 * For more information, please consult
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 *
18 * NCR 5380 Family
19 * SCSI Protocol Controller
20 * Databook
21 *
22 * NCR Microelectronics
23 * 1635 Aeroplaza Drive
24 * Colorado Springs, CO 80916
25 * 1+ (719) 578-3400
26 * 1+ (800) 334-5454
27 */
28
29/*
30 * ++roman: To port the 5380 driver to the Atari, I had to do some changes in
31 * this file, too:
32 *
33 * - Some of the debug statements were incorrect (undefined variables and the
34 * like). I fixed that.
35 *
36 * - In information_transfer(), I think a #ifdef was wrong. Looking at the
37 * possible DMA transfer size should also happen for REAL_DMA. I added this
38 * in the #if statement.
39 *
40 * - When using real DMA, information_transfer() should return in a DATAOUT
41 * phase after starting the DMA. It has nothing more to do.
42 *
43 * - The interrupt service routine should run main after end of DMA, too (not
44 * only after RESELECTION interrupts). Additionally, it should _not_ test
45 * for more interrupts after running main, since a DMA process may have
46 * been started and interrupts are turned on now. The new int could happen
47 * inside the execution of NCR5380_intr(), leading to recursive
48 * calls.
49 *
50 * - I've added a function merge_contiguous_buffers() that tries to
51 * merge scatter-gather buffers that are located at contiguous
52 * physical addresses and can be processed with the same DMA setup.
53 * Since most scatter-gather operations work on a page (4K) of
54 * 4 buffers (1K), in more than 90% of all cases three interrupts and
55 * DMA setup actions are saved.
56 *
57 * - I've deleted all the stuff for AUTOPROBE_IRQ, REAL_DMA_POLL, PSEUDO_DMA
58 * and USLEEP, because these were messing up readability and will never be
59 * needed for Atari SCSI.
Roman Zippelc28bda22007-05-01 22:32:36 +020060 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070061 * - I've revised the NCR5380_main() calling scheme (relax the 'main_running'
62 * stuff), and 'main' is executed in a bottom half if awoken by an
63 * interrupt.
64 *
65 * - The code was quite cluttered up by "#if (NDEBUG & NDEBUG_*) printk..."
66 * constructs. In my eyes, this made the source rather unreadable, so I
67 * finally replaced that by the *_PRINTK() macros.
68 *
69 */
70
71/*
Roman Zippelc28bda22007-05-01 22:32:36 +020072 * Further development / testing that should be done :
73 * 1. Test linked command handling code after Eric is ready with
Linus Torvalds1da177e2005-04-16 15:20:36 -070074 * the high level code.
75 */
db9dff32005-04-03 14:53:59 -050076#include <scsi/scsi_dbg.h>
Matthew Wilcox1abfd372005-12-15 16:22:01 -050077#include <scsi/scsi_transport_spi.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070078
79#if (NDEBUG & NDEBUG_LISTS)
Roman Zippelc28bda22007-05-01 22:32:36 +020080#define LIST(x, y) \
81 do { \
82 printk("LINE:%d Adding %p to %p\n", \
83 __LINE__, (void*)(x), (void*)(y)); \
84 if ((x) == (y)) \
85 udelay(5); \
86 } while (0)
87#define REMOVE(w, x, y, z) \
88 do { \
89 printk("LINE:%d Removing: %p->%p %p->%p \n", \
90 __LINE__, (void*)(w), (void*)(x), \
91 (void*)(y), (void*)(z)); \
92 if ((x) == (y)) \
93 udelay(5); \
94 } while (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -070095#else
96#define LIST(x,y)
97#define REMOVE(w,x,y,z)
98#endif
99
100#ifndef notyet
101#undef LINKED
102#endif
103
104/*
105 * Design
106 * Issues :
107 *
108 * The other Linux SCSI drivers were written when Linux was Intel PC-only,
109 * and specifically for each board rather than each chip. This makes their
110 * adaptation to platforms like the Mac (Some of which use NCR5380's)
111 * more difficult than it has to be.
112 *
113 * Also, many of the SCSI drivers were written before the command queuing
Roman Zippelc28bda22007-05-01 22:32:36 +0200114 * routines were implemented, meaning their implementations of queued
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 * commands were hacked on rather than designed in from the start.
116 *
Roman Zippelc28bda22007-05-01 22:32:36 +0200117 * When I designed the Linux SCSI drivers I figured that
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 * while having two different SCSI boards in a system might be useful
119 * for debugging things, two of the same type wouldn't be used.
120 * Well, I was wrong and a number of users have mailed me about running
121 * multiple high-performance SCSI boards in a server.
122 *
Roman Zippelc28bda22007-05-01 22:32:36 +0200123 * Finally, when I get questions from users, I have no idea what
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 * revision of my driver they are running.
125 *
126 * This driver attempts to address these problems :
Roman Zippelc28bda22007-05-01 22:32:36 +0200127 * This is a generic 5380 driver. To use it on a different platform,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 * one simply writes appropriate system specific macros (ie, data
Roman Zippelc28bda22007-05-01 22:32:36 +0200129 * transfer - some PC's will use the I/O bus, 68K's must use
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130 * memory mapped) and drops this file in their 'C' wrapper.
131 *
Roman Zippelc28bda22007-05-01 22:32:36 +0200132 * As far as command queueing, two queues are maintained for
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 * each 5380 in the system - commands that haven't been issued yet,
Roman Zippelc28bda22007-05-01 22:32:36 +0200134 * and commands that are currently executing. This means that an
135 * unlimited number of commands may be queued, letting
136 * more commands propagate from the higher driver levels giving higher
137 * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported,
138 * allowing multiple commands to propagate all the way to a SCSI-II device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139 * while a command is already executing.
140 *
Roman Zippelc28bda22007-05-01 22:32:36 +0200141 * To solve the multiple-boards-in-the-same-system problem,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 * there is a separate instance structure for each instance
143 * of a 5380 in the system. So, multiple NCR5380 drivers will
144 * be able to coexist with appropriate changes to the high level
Roman Zippelc28bda22007-05-01 22:32:36 +0200145 * SCSI code.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 *
147 * A NCR5380_PUBLIC_REVISION macro is provided, with the release
Roman Zippelc28bda22007-05-01 22:32:36 +0200148 * number (updated for each public release) printed by the
149 * NCR5380_print_options command, which should be called from the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 * wrapper detect function, so that I know what release of the driver
151 * users are using.
152 *
Roman Zippelc28bda22007-05-01 22:32:36 +0200153 * Issues specific to the NCR5380 :
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 *
Roman Zippelc28bda22007-05-01 22:32:36 +0200155 * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead
156 * piece of hardware that requires you to sit in a loop polling for
157 * the REQ signal as long as you are connected. Some devices are
158 * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 * while doing long seek operations.
Roman Zippelc28bda22007-05-01 22:32:36 +0200160 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 * The workaround for this is to keep track of devices that have
162 * disconnected. If the device hasn't disconnected, for commands that
Roman Zippelc28bda22007-05-01 22:32:36 +0200163 * should disconnect, we do something like
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 *
165 * while (!REQ is asserted) { sleep for N usecs; poll for M usecs }
Roman Zippelc28bda22007-05-01 22:32:36 +0200166 *
167 * Some tweaking of N and M needs to be done. An algorithm based
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 * on "time to data" would give the best results as long as short time
Roman Zippelc28bda22007-05-01 22:32:36 +0200169 * to datas (ie, on the same track) were considered, however these
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 * broken devices are the exception rather than the rule and I'd rather
171 * spend my time optimizing for the normal case.
172 *
173 * Architecture :
174 *
175 * At the heart of the design is a coroutine, NCR5380_main,
176 * which is started when not running by the interrupt handler,
177 * timer, and queue command function. It attempts to establish
Roman Zippelc28bda22007-05-01 22:32:36 +0200178 * I_T_L or I_T_L_Q nexuses by removing the commands from the
179 * issue queue and calling NCR5380_select() if a nexus
180 * is not established.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 *
182 * Once a nexus is established, the NCR5380_information_transfer()
183 * phase goes through the various phases as instructed by the target.
184 * if the target goes into MSG IN and sends a DISCONNECT message,
185 * the command structure is placed into the per instance disconnected
186 * queue, and NCR5380_main tries to find more work. If USLEEP
187 * was defined, and the target is idle for too long, the system
188 * will try to sleep.
189 *
190 * If a command has disconnected, eventually an interrupt will trigger,
191 * calling NCR5380_intr() which will in turn call NCR5380_reselect
192 * to reestablish a nexus. This will run main if necessary.
193 *
Roman Zippelc28bda22007-05-01 22:32:36 +0200194 * On command termination, the done function will be called as
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 * appropriate.
196 *
Roman Zippelc28bda22007-05-01 22:32:36 +0200197 * SCSI pointers are maintained in the SCp field of SCSI command
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 * structures, being initialized after the command is connected
199 * in NCR5380_select, and set as appropriate in NCR5380_information_transfer.
200 * Note that in violation of the standard, an implicit SAVE POINTERS operation
201 * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS.
202 */
203
204/*
205 * Using this file :
206 * This file a skeleton Linux SCSI driver for the NCR 5380 series
Roman Zippelc28bda22007-05-01 22:32:36 +0200207 * of chips. To use it, you write an architecture specific functions
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 * and macros and include this file in your driver.
209 *
Roman Zippelc28bda22007-05-01 22:32:36 +0200210 * These macros control options :
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically
Roman Zippelc28bda22007-05-01 22:32:36 +0200212 * for commands that return with a CHECK CONDITION status.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 *
214 * LINKED - if defined, linked commands are supported.
215 *
216 * REAL_DMA - if defined, REAL DMA is used during the data transfer phases.
217 *
218 * SUPPORT_TAGS - if defined, SCSI-2 tagged queuing is used where possible
219 *
220 * These macros MUST be defined :
Roman Zippelc28bda22007-05-01 22:32:36 +0200221 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 * NCR5380_read(register) - read from the specified register
223 *
Roman Zippelc28bda22007-05-01 22:32:36 +0200224 * NCR5380_write(register, value) - write to the specific register
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 *
226 * Either real DMA *or* pseudo DMA may be implemented
Roman Zippelc28bda22007-05-01 22:32:36 +0200227 * REAL functions :
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 * NCR5380_REAL_DMA should be defined if real DMA is to be used.
Roman Zippelc28bda22007-05-01 22:32:36 +0200229 * Note that the DMA setup functions should return the number of bytes
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 * that they were able to program the controller for.
231 *
Roman Zippelc28bda22007-05-01 22:32:36 +0200232 * Also note that generic i386/PC versions of these macros are
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 * available as NCR5380_i386_dma_write_setup,
234 * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual.
235 *
236 * NCR5380_dma_write_setup(instance, src, count) - initialize
237 * NCR5380_dma_read_setup(instance, dst, count) - initialize
238 * NCR5380_dma_residual(instance); - residual count
239 *
240 * PSEUDO functions :
241 * NCR5380_pwrite(instance, src, count)
242 * NCR5380_pread(instance, dst, count);
243 *
244 * If nothing specific to this implementation needs doing (ie, with external
Roman Zippelc28bda22007-05-01 22:32:36 +0200245 * hardware), you must also define
246 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 * NCR5380_queue_command
248 * NCR5380_reset
249 * NCR5380_abort
250 * NCR5380_proc_info
251 *
Roman Zippelc28bda22007-05-01 22:32:36 +0200252 * to be the global entry points into the specific driver, ie
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 * #define NCR5380_queue_command t128_queue_command.
254 *
255 * If this is not done, the routines will be defined as static functions
256 * with the NCR5380* names and the user must provide a globally
257 * accessible wrapper function.
258 *
259 * The generic driver is initialized by calling NCR5380_init(instance),
Roman Zippelc28bda22007-05-01 22:32:36 +0200260 * after setting the appropriate host specific fields and ID. If the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance,
262 * possible) function may be used. Before the specific driver initialization
263 * code finishes, NCR5380_print_options should be called.
264 */
265
266static struct Scsi_Host *first_instance = NULL;
Christoph Hellwigd0be4a7d2005-10-31 18:31:40 +0100267static struct scsi_host_template *the_template = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268
269/* Macros ease life... :-) */
270#define SETUP_HOSTDATA(in) \
271 struct NCR5380_hostdata *hostdata = \
272 (struct NCR5380_hostdata *)(in)->hostdata
273#define HOSTDATA(in) ((struct NCR5380_hostdata *)(in)->hostdata)
274
Roman Zippel3130d902007-05-01 22:32:37 +0200275#define NEXT(cmd) ((Scsi_Cmnd *)(cmd)->host_scribble)
276#define SET_NEXT(cmd,next) ((cmd)->host_scribble = (void *)(next))
277#define NEXTADDR(cmd) ((Scsi_Cmnd **)&(cmd)->host_scribble)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278
279#define HOSTNO instance->host_no
280#define H_NO(cmd) (cmd)->device->host->host_no
281
282#ifdef SUPPORT_TAGS
283
284/*
285 * Functions for handling tagged queuing
286 * =====================================
287 *
288 * ++roman (01/96): Now I've implemented SCSI-2 tagged queuing. Some notes:
289 *
290 * Using consecutive numbers for the tags is no good idea in my eyes. There
291 * could be wrong re-usings if the counter (8 bit!) wraps and some early
292 * command has been preempted for a long time. My solution: a bitfield for
293 * remembering used tags.
294 *
295 * There's also the problem that each target has a certain queue size, but we
296 * cannot know it in advance :-( We just see a QUEUE_FULL status being
297 * returned. So, in this case, the driver internal queue size assumption is
298 * reduced to the number of active tags if QUEUE_FULL is returned by the
299 * target. The command is returned to the mid-level, but with status changed
300 * to BUSY, since --as I've seen-- the mid-level can't handle QUEUE_FULL
301 * correctly.
302 *
303 * We're also not allowed running tagged commands as long as an untagged
304 * command is active. And REQUEST SENSE commands after a contingent allegiance
305 * condition _must_ be untagged. To keep track whether an untagged command has
306 * been issued, the host->busy array is still employed, as it is without
307 * support for tagged queuing.
308 *
309 * One could suspect that there are possible race conditions between
310 * is_lun_busy(), cmd_get_tag() and cmd_free_tag(). But I think this isn't the
311 * case: is_lun_busy() and cmd_get_tag() are both called from NCR5380_main(),
312 * which already guaranteed to be running at most once. It is also the only
313 * place where tags/LUNs are allocated. So no other allocation can slip
314 * between that pair, there could only happen a reselection, which can free a
315 * tag, but that doesn't hurt. Only the sequence in cmd_free_tag() becomes
316 * important: the tag bit must be cleared before 'nr_allocated' is decreased.
317 */
318
319/* -1 for TAG_NONE is not possible with unsigned char cmd->tag */
320#undef TAG_NONE
321#define TAG_NONE 0xff
322
323typedef struct {
Roman Zippelc28bda22007-05-01 22:32:36 +0200324 DECLARE_BITMAP(allocated, MAX_TAGS);
325 int nr_allocated;
326 int queue_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327} TAG_ALLOC;
328
Roman Zippelc28bda22007-05-01 22:32:36 +0200329static TAG_ALLOC TagAlloc[8][8]; /* 8 targets and 8 LUNs */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330
331
Roman Zippelc28bda22007-05-01 22:32:36 +0200332static void __init init_tags(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333{
Roman Zippelc28bda22007-05-01 22:32:36 +0200334 int target, lun;
335 TAG_ALLOC *ta;
336
337 if (!setup_use_tagged_queuing)
338 return;
339
340 for (target = 0; target < 8; ++target) {
341 for (lun = 0; lun < 8; ++lun) {
342 ta = &TagAlloc[target][lun];
343 bitmap_zero(ta->allocated, MAX_TAGS);
344 ta->nr_allocated = 0;
345 /* At the beginning, assume the maximum queue size we could
346 * support (MAX_TAGS). This value will be decreased if the target
347 * returns QUEUE_FULL status.
348 */
349 ta->queue_size = MAX_TAGS;
350 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352}
353
354
355/* Check if we can issue a command to this LUN: First see if the LUN is marked
356 * busy by an untagged command. If the command should use tagged queuing, also
357 * check that there is a free tag and the target's queue won't overflow. This
358 * function should be called with interrupts disabled to avoid race
359 * conditions.
Roman Zippelc28bda22007-05-01 22:32:36 +0200360 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361
Roman Zippelc28bda22007-05-01 22:32:36 +0200362static int is_lun_busy(Scsi_Cmnd *cmd, int should_be_tagged)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363{
Roman Zippelc28bda22007-05-01 22:32:36 +0200364 SETUP_HOSTDATA(cmd->device->host);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365
Roman Zippelc28bda22007-05-01 22:32:36 +0200366 if (hostdata->busy[cmd->device->id] & (1 << cmd->device->lun))
367 return 1;
368 if (!should_be_tagged ||
369 !setup_use_tagged_queuing || !cmd->device->tagged_supported)
370 return 0;
371 if (TagAlloc[cmd->device->id][cmd->device->lun].nr_allocated >=
372 TagAlloc[cmd->device->id][cmd->device->lun].queue_size) {
373 TAG_PRINTK("scsi%d: target %d lun %d: no free tags\n",
374 H_NO(cmd), cmd->device->id, cmd->device->lun);
375 return 1;
376 }
377 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378}
379
380
381/* Allocate a tag for a command (there are no checks anymore, check_lun_busy()
382 * must be called before!), or reserve the LUN in 'busy' if the command is
383 * untagged.
384 */
385
Roman Zippelc28bda22007-05-01 22:32:36 +0200386static void cmd_get_tag(Scsi_Cmnd *cmd, int should_be_tagged)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387{
Roman Zippelc28bda22007-05-01 22:32:36 +0200388 SETUP_HOSTDATA(cmd->device->host);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389
Roman Zippelc28bda22007-05-01 22:32:36 +0200390 /* If we or the target don't support tagged queuing, allocate the LUN for
391 * an untagged command.
392 */
393 if (!should_be_tagged ||
394 !setup_use_tagged_queuing || !cmd->device->tagged_supported) {
395 cmd->tag = TAG_NONE;
396 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
397 TAG_PRINTK("scsi%d: target %d lun %d now allocated by untagged "
398 "command\n", H_NO(cmd), cmd->device->id, cmd->device->lun);
399 } else {
400 TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401
Roman Zippelc28bda22007-05-01 22:32:36 +0200402 cmd->tag = find_first_zero_bit(ta->allocated, MAX_TAGS);
403 set_bit(cmd->tag, ta->allocated);
404 ta->nr_allocated++;
405 TAG_PRINTK("scsi%d: using tag %d for target %d lun %d "
406 "(now %d tags in use)\n",
407 H_NO(cmd), cmd->tag, cmd->device->id,
408 cmd->device->lun, ta->nr_allocated);
409 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410}
411
412
413/* Mark the tag of command 'cmd' as free, or in case of an untagged command,
414 * unlock the LUN.
415 */
416
Roman Zippelc28bda22007-05-01 22:32:36 +0200417static void cmd_free_tag(Scsi_Cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418{
Roman Zippelc28bda22007-05-01 22:32:36 +0200419 SETUP_HOSTDATA(cmd->device->host);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420
Roman Zippelc28bda22007-05-01 22:32:36 +0200421 if (cmd->tag == TAG_NONE) {
422 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
423 TAG_PRINTK("scsi%d: target %d lun %d untagged cmd finished\n",
424 H_NO(cmd), cmd->device->id, cmd->device->lun);
425 } else if (cmd->tag >= MAX_TAGS) {
426 printk(KERN_NOTICE "scsi%d: trying to free bad tag %d!\n",
427 H_NO(cmd), cmd->tag);
428 } else {
429 TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun];
430 clear_bit(cmd->tag, ta->allocated);
431 ta->nr_allocated--;
432 TAG_PRINTK("scsi%d: freed tag %d for target %d lun %d\n",
433 H_NO(cmd), cmd->tag, cmd->device->id, cmd->device->lun);
434 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435}
436
437
Roman Zippelc28bda22007-05-01 22:32:36 +0200438static void free_all_tags(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439{
Roman Zippelc28bda22007-05-01 22:32:36 +0200440 int target, lun;
441 TAG_ALLOC *ta;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442
Roman Zippelc28bda22007-05-01 22:32:36 +0200443 if (!setup_use_tagged_queuing)
444 return;
445
446 for (target = 0; target < 8; ++target) {
447 for (lun = 0; lun < 8; ++lun) {
448 ta = &TagAlloc[target][lun];
449 bitmap_zero(ta->allocated, MAX_TAGS);
450 ta->nr_allocated = 0;
451 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453}
454
455#endif /* SUPPORT_TAGS */
456
457
458/*
459 * Function: void merge_contiguous_buffers( Scsi_Cmnd *cmd )
460 *
461 * Purpose: Try to merge several scatter-gather requests into one DMA
462 * transfer. This is possible if the scatter buffers lie on
463 * physical contiguous addresses.
464 *
465 * Parameters: Scsi_Cmnd *cmd
466 * The command to work on. The first scatter buffer's data are
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300467 * assumed to be already transferred into ptr/this_residual.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468 */
469
Roman Zippelc28bda22007-05-01 22:32:36 +0200470static void merge_contiguous_buffers(Scsi_Cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471{
Roman Zippelc28bda22007-05-01 22:32:36 +0200472 unsigned long endaddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473#if (NDEBUG & NDEBUG_MERGING)
Roman Zippelc28bda22007-05-01 22:32:36 +0200474 unsigned long oldlen = cmd->SCp.this_residual;
475 int cnt = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476#endif
477
Roman Zippelc28bda22007-05-01 22:32:36 +0200478 for (endaddr = virt_to_phys(cmd->SCp.ptr + cmd->SCp.this_residual - 1) + 1;
479 cmd->SCp.buffers_residual &&
Geert Uytterhoeven5a1cb472007-10-24 08:55:40 +0200480 virt_to_phys(sg_virt(&cmd->SCp.buffer[1])) == endaddr;) {
Roman Zippelc28bda22007-05-01 22:32:36 +0200481 MER_PRINTK("VTOP(%p) == %08lx -> merging\n",
Geert Uytterhoeven5a1cb472007-10-24 08:55:40 +0200482 page_address(sg_page(&cmd->SCp.buffer[1])), endaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483#if (NDEBUG & NDEBUG_MERGING)
Roman Zippelc28bda22007-05-01 22:32:36 +0200484 ++cnt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485#endif
Roman Zippelc28bda22007-05-01 22:32:36 +0200486 ++cmd->SCp.buffer;
487 --cmd->SCp.buffers_residual;
488 cmd->SCp.this_residual += cmd->SCp.buffer->length;
489 endaddr += cmd->SCp.buffer->length;
490 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491#if (NDEBUG & NDEBUG_MERGING)
Roman Zippelc28bda22007-05-01 22:32:36 +0200492 if (oldlen != cmd->SCp.this_residual)
493 MER_PRINTK("merged %d buffers from %p, new length %08x\n",
494 cnt, cmd->SCp.ptr, cmd->SCp.this_residual);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495#endif
496}
497
498/*
499 * Function : void initialize_SCp(Scsi_Cmnd *cmd)
500 *
Roman Zippelc28bda22007-05-01 22:32:36 +0200501 * Purpose : initialize the saved data pointers for cmd to point to the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502 * start of the buffer.
503 *
504 * Inputs : cmd - Scsi_Cmnd structure to have pointers reset.
505 */
506
Roman Zippelc28bda22007-05-01 22:32:36 +0200507static inline void initialize_SCp(Scsi_Cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508{
Roman Zippelc28bda22007-05-01 22:32:36 +0200509 /*
510 * Initialize the Scsi Pointer field so that all of the commands in the
511 * various queues are valid.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512 */
Roman Zippelc28bda22007-05-01 22:32:36 +0200513
Boaz Harrosh9e0fe442007-11-05 11:23:35 +0200514 if (scsi_bufflen(cmd)) {
515 cmd->SCp.buffer = scsi_sglist(cmd);
516 cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1;
Jens Axboe45711f12007-10-22 21:19:53 +0200517 cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
Roman Zippelc28bda22007-05-01 22:32:36 +0200518 cmd->SCp.this_residual = cmd->SCp.buffer->length;
519 /* ++roman: Try to merge some scatter-buffers if they are at
520 * contiguous physical addresses.
521 */
522 merge_contiguous_buffers(cmd);
523 } else {
524 cmd->SCp.buffer = NULL;
525 cmd->SCp.buffers_residual = 0;
Boaz Harrosh9e0fe442007-11-05 11:23:35 +0200526 cmd->SCp.ptr = NULL;
527 cmd->SCp.this_residual = 0;
Roman Zippelc28bda22007-05-01 22:32:36 +0200528 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529}
530
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531#include <linux/delay.h>
532
533#if NDEBUG
534static struct {
Roman Zippelc28bda22007-05-01 22:32:36 +0200535 unsigned char mask;
536 const char *name;
537} signals[] = {
538 { SR_DBP, "PARITY"}, { SR_RST, "RST" }, { SR_BSY, "BSY" },
539 { SR_REQ, "REQ" }, { SR_MSG, "MSG" }, { SR_CD, "CD" }, { SR_IO, "IO" },
540 { SR_SEL, "SEL" }, {0, NULL}
541}, basrs[] = {
542 {BASR_ATN, "ATN"}, {BASR_ACK, "ACK"}, {0, NULL}
543}, icrs[] = {
544 {ICR_ASSERT_RST, "ASSERT RST"},{ICR_ASSERT_ACK, "ASSERT ACK"},
545 {ICR_ASSERT_BSY, "ASSERT BSY"}, {ICR_ASSERT_SEL, "ASSERT SEL"},
546 {ICR_ASSERT_ATN, "ASSERT ATN"}, {ICR_ASSERT_DATA, "ASSERT DATA"},
547 {0, NULL}
548}, mrs[] = {
549 {MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"}, {MR_TARGET, "MODE TARGET"},
550 {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"}, {MR_ENABLE_PAR_INTR,
551 "MODE PARITY INTR"}, {MR_ENABLE_EOP_INTR,"MODE EOP INTR"},
552 {MR_MONITOR_BSY, "MODE MONITOR BSY"},
553 {MR_DMA_MODE, "MODE DMA"}, {MR_ARBITRATE, "MODE ARBITRATION"},
554 {0, NULL}
555};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556
557/*
558 * Function : void NCR5380_print(struct Scsi_Host *instance)
559 *
560 * Purpose : print the SCSI bus signals for debugging purposes
561 *
562 * Input : instance - which NCR5380
563 */
564
Roman Zippelc28bda22007-05-01 22:32:36 +0200565static void NCR5380_print(struct Scsi_Host *instance)
566{
567 unsigned char status, data, basr, mr, icr, i;
568 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569
Roman Zippelc28bda22007-05-01 22:32:36 +0200570 local_irq_save(flags);
571 data = NCR5380_read(CURRENT_SCSI_DATA_REG);
572 status = NCR5380_read(STATUS_REG);
573 mr = NCR5380_read(MODE_REG);
574 icr = NCR5380_read(INITIATOR_COMMAND_REG);
575 basr = NCR5380_read(BUS_AND_STATUS_REG);
576 local_irq_restore(flags);
577 printk("STATUS_REG: %02x ", status);
578 for (i = 0; signals[i].mask; ++i)
579 if (status & signals[i].mask)
580 printk(",%s", signals[i].name);
581 printk("\nBASR: %02x ", basr);
582 for (i = 0; basrs[i].mask; ++i)
583 if (basr & basrs[i].mask)
584 printk(",%s", basrs[i].name);
585 printk("\nICR: %02x ", icr);
586 for (i = 0; icrs[i].mask; ++i)
587 if (icr & icrs[i].mask)
588 printk(",%s", icrs[i].name);
589 printk("\nMODE: %02x ", mr);
590 for (i = 0; mrs[i].mask; ++i)
591 if (mr & mrs[i].mask)
592 printk(",%s", mrs[i].name);
593 printk("\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594}
595
596static struct {
Roman Zippelc28bda22007-05-01 22:32:36 +0200597 unsigned char value;
598 const char *name;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599} phases[] = {
Roman Zippelc28bda22007-05-01 22:32:36 +0200600 {PHASE_DATAOUT, "DATAOUT"}, {PHASE_DATAIN, "DATAIN"}, {PHASE_CMDOUT, "CMDOUT"},
601 {PHASE_STATIN, "STATIN"}, {PHASE_MSGOUT, "MSGOUT"}, {PHASE_MSGIN, "MSGIN"},
602 {PHASE_UNKNOWN, "UNKNOWN"}
603};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604
Roman Zippelc28bda22007-05-01 22:32:36 +0200605/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606 * Function : void NCR5380_print_phase(struct Scsi_Host *instance)
607 *
608 * Purpose : print the current SCSI phase for debugging purposes
609 *
610 * Input : instance - which NCR5380
611 */
612
613static void NCR5380_print_phase(struct Scsi_Host *instance)
614{
Roman Zippelc28bda22007-05-01 22:32:36 +0200615 unsigned char status;
616 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617
Roman Zippelc28bda22007-05-01 22:32:36 +0200618 status = NCR5380_read(STATUS_REG);
619 if (!(status & SR_REQ))
620 printk(KERN_DEBUG "scsi%d: REQ not asserted, phase unknown.\n", HOSTNO);
621 else {
622 for (i = 0; (phases[i].value != PHASE_UNKNOWN) &&
623 (phases[i].value != (status & PHASE_MASK)); ++i)
624 ;
625 printk(KERN_DEBUG "scsi%d: phase %s\n", HOSTNO, phases[i].name);
626 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627}
628
629#else /* !NDEBUG */
630
631/* dummies... */
Roman Zippelc28bda22007-05-01 22:32:36 +0200632static inline void NCR5380_print(struct Scsi_Host *instance)
633{
634};
635static inline void NCR5380_print_phase(struct Scsi_Host *instance)
636{
637};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638
639#endif
640
641/*
642 * ++roman: New scheme of calling NCR5380_main()
Roman Zippelc28bda22007-05-01 22:32:36 +0200643 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644 * If we're not in an interrupt, we can call our main directly, it cannot be
645 * already running. Else, we queue it on a task queue, if not 'main_running'
646 * tells us that a lower level is already executing it. This way,
647 * 'main_running' needs not be protected in a special way.
648 *
649 * queue_main() is a utility function for putting our main onto the task
650 * queue, if main_running is false. It should be called only from a
651 * interrupt or bottom half.
652 */
653
Tejun Heo5a0e3ad2010-03-24 17:04:11 +0900654#include <linux/gfp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655#include <linux/workqueue.h>
656#include <linux/interrupt.h>
657
Roman Zippelc28bda22007-05-01 22:32:36 +0200658static volatile int main_running;
Geert Uytterhoevenb312b382007-05-01 22:32:48 +0200659static DECLARE_WORK(NCR5380_tqueue, NCR5380_main);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660
Roman Zippelc28bda22007-05-01 22:32:36 +0200661static inline void queue_main(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662{
Roman Zippelc28bda22007-05-01 22:32:36 +0200663 if (!main_running) {
664 /* If in interrupt and NCR5380_main() not already running,
665 queue it on the 'immediate' task queue, to be processed
666 immediately after the current interrupt processing has
667 finished. */
668 schedule_work(&NCR5380_tqueue);
669 }
670 /* else: nothing to do: the running NCR5380_main() will pick up
671 any newly queued command. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672}
673
674
Roman Zippelc28bda22007-05-01 22:32:36 +0200675static inline void NCR5380_all_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676{
Roman Zippelc28bda22007-05-01 22:32:36 +0200677 static int done = 0;
678 if (!done) {
679 INI_PRINTK("scsi : NCR5380_all_init()\n");
680 done = 1;
681 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682}
683
Roman Zippelc28bda22007-05-01 22:32:36 +0200684
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685/*
686 * Function : void NCR58380_print_options (struct Scsi_Host *instance)
687 *
688 * Purpose : called by probe code indicating the NCR5380 driver
689 * options that were selected.
690 *
691 * Inputs : instance, pointer to this instance. Unused.
692 */
693
Roman Zippelc28bda22007-05-01 22:32:36 +0200694static void __init NCR5380_print_options(struct Scsi_Host *instance)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695{
Roman Zippelc28bda22007-05-01 22:32:36 +0200696 printk(" generic options"
697#ifdef AUTOSENSE
698 " AUTOSENSE"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699#endif
700#ifdef REAL_DMA
Roman Zippelc28bda22007-05-01 22:32:36 +0200701 " REAL DMA"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702#endif
703#ifdef PARITY
Roman Zippelc28bda22007-05-01 22:32:36 +0200704 " PARITY"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705#endif
706#ifdef SUPPORT_TAGS
Roman Zippelc28bda22007-05-01 22:32:36 +0200707 " SCSI-2 TAGGED QUEUING"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708#endif
Roman Zippelc28bda22007-05-01 22:32:36 +0200709 );
710 printk(" generic release=%d", NCR5380_PUBLIC_RELEASE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711}
712
713/*
714 * Function : void NCR5380_print_status (struct Scsi_Host *instance)
715 *
716 * Purpose : print commands in the various queues, called from
717 * NCR5380_abort and NCR5380_debug to aid debugging.
718 *
Roman Zippelc28bda22007-05-01 22:32:36 +0200719 * Inputs : instance, pointer to this instance.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720 */
721
Roman Zippelc28bda22007-05-01 22:32:36 +0200722static void NCR5380_print_status(struct Scsi_Host *instance)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723{
Roman Zippelc28bda22007-05-01 22:32:36 +0200724 char *pr_bfr;
725 char *start;
726 int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727
Roman Zippelc28bda22007-05-01 22:32:36 +0200728 NCR_PRINT(NDEBUG_ANY);
729 NCR_PRINT_PHASE(NDEBUG_ANY);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730
Roman Zippelc28bda22007-05-01 22:32:36 +0200731 pr_bfr = (char *)__get_free_page(GFP_ATOMIC);
732 if (!pr_bfr) {
733 printk("NCR5380_print_status: no memory for print buffer\n");
734 return;
735 }
736 len = NCR5380_proc_info(instance, pr_bfr, &start, 0, PAGE_SIZE, 0);
737 pr_bfr[len] = 0;
738 printk("\n%s\n", pr_bfr);
739 free_page((unsigned long)pr_bfr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740}
741
742
743/******************************************/
744/*
745 * /proc/scsi/[dtc pas16 t128 generic]/[0-ASC_NUM_BOARD_SUPPORTED]
746 *
747 * *buffer: I/O buffer
748 * **start: if inout == FALSE pointer into buffer where user read should start
749 * offset: current offset
750 * length: length of buffer
751 * hostno: Scsi_Host host_no
752 * inout: TRUE - user is writing; FALSE - user is reading
753 *
754 * Return the number of bytes read from or written
755*/
756
757#undef SPRINTF
Roman Zippelc28bda22007-05-01 22:32:36 +0200758#define SPRINTF(fmt,args...) \
759 do { \
760 if (pos + strlen(fmt) + 20 /* slop */ < buffer + length) \
761 pos += sprintf(pos, fmt , ## args); \
762 } while(0)
763static char *lprint_Scsi_Cmnd(Scsi_Cmnd *cmd, char *pos, char *buffer, int length);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764
Roman Zippelc28bda22007-05-01 22:32:36 +0200765static int NCR5380_proc_info(struct Scsi_Host *instance, char *buffer,
766 char **start, off_t offset, int length, int inout)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767{
Roman Zippelc28bda22007-05-01 22:32:36 +0200768 char *pos = buffer;
769 struct NCR5380_hostdata *hostdata;
770 Scsi_Cmnd *ptr;
771 unsigned long flags;
772 off_t begin = 0;
773#define check_offset() \
774 do { \
775 if (pos - buffer < offset - begin) { \
776 begin += pos - buffer; \
777 pos = buffer; \
778 } \
779 } while (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780
Roman Zippelc28bda22007-05-01 22:32:36 +0200781 hostdata = (struct NCR5380_hostdata *)instance->hostdata;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782
Roman Zippelc28bda22007-05-01 22:32:36 +0200783 if (inout) /* Has data been written to the file ? */
784 return -ENOSYS; /* Currently this is a no-op */
785 SPRINTF("NCR5380 core release=%d.\n", NCR5380_PUBLIC_RELEASE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786 check_offset();
Roman Zippelc28bda22007-05-01 22:32:36 +0200787 local_irq_save(flags);
788 SPRINTF("NCR5380: coroutine is%s running.\n",
789 main_running ? "" : "n't");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790 check_offset();
Roman Zippelc28bda22007-05-01 22:32:36 +0200791 if (!hostdata->connected)
792 SPRINTF("scsi%d: no currently connected command\n", HOSTNO);
793 else
794 pos = lprint_Scsi_Cmnd((Scsi_Cmnd *) hostdata->connected,
795 pos, buffer, length);
796 SPRINTF("scsi%d: issue_queue\n", HOSTNO);
797 check_offset();
798 for (ptr = (Scsi_Cmnd *)hostdata->issue_queue; ptr; ptr = NEXT(ptr)) {
799 pos = lprint_Scsi_Cmnd(ptr, pos, buffer, length);
800 check_offset();
801 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700802
Roman Zippelc28bda22007-05-01 22:32:36 +0200803 SPRINTF("scsi%d: disconnected_queue\n", HOSTNO);
804 check_offset();
805 for (ptr = (Scsi_Cmnd *) hostdata->disconnected_queue; ptr;
806 ptr = NEXT(ptr)) {
807 pos = lprint_Scsi_Cmnd(ptr, pos, buffer, length);
808 check_offset();
809 }
810
811 local_irq_restore(flags);
812 *start = buffer + (offset - begin);
813 if (pos - buffer < offset - begin)
814 return 0;
815 else if (pos - buffer - (offset - begin) < length)
816 return pos - buffer - (offset - begin);
817 return length;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700818}
819
Roman Zippelc28bda22007-05-01 22:32:36 +0200820static char *lprint_Scsi_Cmnd(Scsi_Cmnd *cmd, char *pos, char *buffer, int length)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821{
Roman Zippelc28bda22007-05-01 22:32:36 +0200822 int i, s;
823 unsigned char *command;
824 SPRINTF("scsi%d: destination target %d, lun %d\n",
825 H_NO(cmd), cmd->device->id, cmd->device->lun);
826 SPRINTF(" command = ");
827 command = cmd->cmnd;
828 SPRINTF("%2d (0x%02x)", command[0], command[0]);
829 for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i)
830 SPRINTF(" %02x", command[i]);
831 SPRINTF("\n");
832 return pos;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700833}
834
835
Roman Zippelc28bda22007-05-01 22:32:36 +0200836/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700837 * Function : void NCR5380_init (struct Scsi_Host *instance)
838 *
839 * Purpose : initializes *instance and corresponding 5380 chip.
840 *
Roman Zippelc28bda22007-05-01 22:32:36 +0200841 * Inputs : instance - instantiation of the 5380 driver.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842 *
843 * Notes : I assume that the host, hostno, and id bits have been
Roman Zippelc28bda22007-05-01 22:32:36 +0200844 * set correctly. I don't care about the irq and other fields.
845 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700846 */
847
Michael Schmitz95fde7a2009-01-18 03:22:15 +0100848static int __init NCR5380_init(struct Scsi_Host *instance, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700849{
Roman Zippelc28bda22007-05-01 22:32:36 +0200850 int i;
851 SETUP_HOSTDATA(instance);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852
Roman Zippelc28bda22007-05-01 22:32:36 +0200853 NCR5380_all_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854
Roman Zippelc28bda22007-05-01 22:32:36 +0200855 hostdata->aborted = 0;
856 hostdata->id_mask = 1 << instance->this_id;
857 hostdata->id_higher_mask = 0;
858 for (i = hostdata->id_mask; i <= 0x80; i <<= 1)
859 if (i > hostdata->id_mask)
860 hostdata->id_higher_mask |= i;
861 for (i = 0; i < 8; ++i)
862 hostdata->busy[i] = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863#ifdef SUPPORT_TAGS
Roman Zippelc28bda22007-05-01 22:32:36 +0200864 init_tags();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865#endif
866#if defined (REAL_DMA)
Roman Zippelc28bda22007-05-01 22:32:36 +0200867 hostdata->dma_len = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868#endif
Roman Zippelc28bda22007-05-01 22:32:36 +0200869 hostdata->targets_present = 0;
870 hostdata->connected = NULL;
871 hostdata->issue_queue = NULL;
872 hostdata->disconnected_queue = NULL;
873 hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874
Roman Zippelc28bda22007-05-01 22:32:36 +0200875 if (!the_template) {
876 the_template = instance->hostt;
877 first_instance = instance;
878 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700879
880#ifndef AUTOSENSE
Roman Zippelc28bda22007-05-01 22:32:36 +0200881 if ((instance->cmd_per_lun > 1) || (instance->can_queue > 1))
882 printk("scsi%d: WARNING : support for multiple outstanding commands enabled\n"
883 " without AUTOSENSE option, contingent allegiance conditions may\n"
884 " be incorrectly cleared.\n", HOSTNO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700885#endif /* def AUTOSENSE */
886
Roman Zippelc28bda22007-05-01 22:32:36 +0200887 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
888 NCR5380_write(MODE_REG, MR_BASE);
889 NCR5380_write(TARGET_COMMAND_REG, 0);
890 NCR5380_write(SELECT_ENABLE_REG, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891
Roman Zippelc28bda22007-05-01 22:32:36 +0200892 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893}
894
Roman Zippelc28bda22007-05-01 22:32:36 +0200895/*
Roman Zippelc28bda22007-05-01 22:32:36 +0200896 * Function : int NCR5380_queue_command (Scsi_Cmnd *cmd,
897 * void (*done)(Scsi_Cmnd *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898 *
899 * Purpose : enqueues a SCSI command
900 *
901 * Inputs : cmd - SCSI command, done - function called on completion, with
902 * a pointer to the command descriptor.
Roman Zippelc28bda22007-05-01 22:32:36 +0200903 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904 * Returns : 0
905 *
Roman Zippelc28bda22007-05-01 22:32:36 +0200906 * Side effects :
907 * cmd is added to the per instance issue_queue, with minor
908 * twiddling done to the host specific fields of cmd. If the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700909 * main coroutine is not running, it is restarted.
910 *
911 */
912
Jeff Garzikf2812332010-11-16 02:10:29 -0500913static int NCR5380_queue_command_lck(Scsi_Cmnd *cmd, void (*done)(Scsi_Cmnd *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700914{
Roman Zippelc28bda22007-05-01 22:32:36 +0200915 SETUP_HOSTDATA(cmd->device->host);
916 Scsi_Cmnd *tmp;
917 int oldto;
918 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700919
920#if (NDEBUG & NDEBUG_NO_WRITE)
Roman Zippelc28bda22007-05-01 22:32:36 +0200921 switch (cmd->cmnd[0]) {
922 case WRITE_6:
923 case WRITE_10:
924 printk(KERN_NOTICE "scsi%d: WRITE attempted with NO_WRITE debugging flag set\n",
925 H_NO(cmd));
926 cmd->result = (DID_ERROR << 16);
927 done(cmd);
928 return 0;
929 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700930#endif /* (NDEBUG & NDEBUG_NO_WRITE) */
931
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932#ifdef NCR5380_STATS
933# if 0
Roman Zippelc28bda22007-05-01 22:32:36 +0200934 if (!hostdata->connected && !hostdata->issue_queue &&
935 !hostdata->disconnected_queue) {
936 hostdata->timebase = jiffies;
937 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700938# endif
939# ifdef NCR5380_STAT_LIMIT
Boaz Harrosh9e0fe442007-11-05 11:23:35 +0200940 if (scsi_bufflen(cmd) > NCR5380_STAT_LIMIT)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700941# endif
Roman Zippelc28bda22007-05-01 22:32:36 +0200942 switch (cmd->cmnd[0]) {
943 case WRITE:
944 case WRITE_6:
945 case WRITE_10:
946 hostdata->time_write[cmd->device->id] -= (jiffies - hostdata->timebase);
Boaz Harrosh9e0fe442007-11-05 11:23:35 +0200947 hostdata->bytes_write[cmd->device->id] += scsi_bufflen(cmd);
Roman Zippelc28bda22007-05-01 22:32:36 +0200948 hostdata->pendingw++;
949 break;
950 case READ:
951 case READ_6:
952 case READ_10:
953 hostdata->time_read[cmd->device->id] -= (jiffies - hostdata->timebase);
Boaz Harrosh9e0fe442007-11-05 11:23:35 +0200954 hostdata->bytes_read[cmd->device->id] += scsi_bufflen(cmd);
Roman Zippelc28bda22007-05-01 22:32:36 +0200955 hostdata->pendingr++;
956 break;
957 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700958#endif
959
Roman Zippelc28bda22007-05-01 22:32:36 +0200960 /*
961 * We use the host_scribble field as a pointer to the next command
962 * in a queue
963 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964
Roman Zippel3130d902007-05-01 22:32:37 +0200965 SET_NEXT(cmd, NULL);
Roman Zippelc28bda22007-05-01 22:32:36 +0200966 cmd->scsi_done = done;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967
Roman Zippelc28bda22007-05-01 22:32:36 +0200968 cmd->result = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969
Roman Zippelc28bda22007-05-01 22:32:36 +0200970 /*
971 * Insert the cmd into the issue queue. Note that REQUEST SENSE
972 * commands are added to the head of the queue since any command will
973 * clear the contingent allegiance condition that exists and the
974 * sense data is only guaranteed to be valid while the condition exists.
975 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976
Roman Zippelc28bda22007-05-01 22:32:36 +0200977 local_irq_save(flags);
978 /* ++guenther: now that the issue queue is being set up, we can lock ST-DMA.
979 * Otherwise a running NCR5380_main may steal the lock.
980 * Lock before actually inserting due to fairness reasons explained in
981 * atari_scsi.c. If we insert first, then it's impossible for this driver
982 * to release the lock.
983 * Stop timer for this command while waiting for the lock, or timeouts
984 * may happen (and they really do), and it's no good if the command doesn't
985 * appear in any of the queues.
986 * ++roman: Just disabling the NCR interrupt isn't sufficient here,
987 * because also a timer int can trigger an abort or reset, which would
988 * alter queues and touch the lock.
989 */
990 if (!IS_A_TT()) {
Michael Schmitz8ce79552007-06-03 12:55:04 +0200991 /* perhaps stop command timer here */
Roman Zippelc28bda22007-05-01 22:32:36 +0200992 falcon_get_lock();
Michael Schmitz8ce79552007-06-03 12:55:04 +0200993 /* perhaps restart command timer here */
Roman Zippelc28bda22007-05-01 22:32:36 +0200994 }
995 if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) {
996 LIST(cmd, hostdata->issue_queue);
Roman Zippel3130d902007-05-01 22:32:37 +0200997 SET_NEXT(cmd, hostdata->issue_queue);
Roman Zippelc28bda22007-05-01 22:32:36 +0200998 hostdata->issue_queue = cmd;
999 } else {
1000 for (tmp = (Scsi_Cmnd *)hostdata->issue_queue;
1001 NEXT(tmp); tmp = NEXT(tmp))
1002 ;
1003 LIST(cmd, tmp);
Roman Zippel3130d902007-05-01 22:32:37 +02001004 SET_NEXT(tmp, cmd);
Roman Zippelc28bda22007-05-01 22:32:36 +02001005 }
1006 local_irq_restore(flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001007
Roman Zippelc28bda22007-05-01 22:32:36 +02001008 QU_PRINTK("scsi%d: command added to %s of queue\n", H_NO(cmd),
1009 (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001010
Roman Zippelc28bda22007-05-01 22:32:36 +02001011 /* If queue_command() is called from an interrupt (real one or bottom
1012 * half), we let queue_main() do the job of taking care about main. If it
1013 * is already running, this is a no-op, else main will be queued.
1014 *
1015 * If we're not in an interrupt, we can call NCR5380_main()
1016 * unconditionally, because it cannot be already running.
1017 */
1018 if (in_interrupt() || ((flags >> 8) & 7) >= 6)
1019 queue_main();
1020 else
1021 NCR5380_main(NULL);
1022 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023}
1024
Jeff Garzikf2812332010-11-16 02:10:29 -05001025static DEF_SCSI_QCMD(NCR5380_queue_command)
1026
Linus Torvalds1da177e2005-04-16 15:20:36 -07001027/*
Roman Zippelc28bda22007-05-01 22:32:36 +02001028 * Function : NCR5380_main (void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029 *
Roman Zippelc28bda22007-05-01 22:32:36 +02001030 * Purpose : NCR5380_main is a coroutine that runs as long as more work can
1031 * be done on the NCR5380 host adapters in a system. Both
1032 * NCR5380_queue_command() and NCR5380_intr() will try to start it
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033 * in case it is not running.
Roman Zippelc28bda22007-05-01 22:32:36 +02001034 *
1035 * NOTE : NCR5380_main exits with interrupts *disabled*, the caller should
Linus Torvalds1da177e2005-04-16 15:20:36 -07001036 * reenable them. This prevents reentrancy and kernel stack overflow.
Roman Zippelc28bda22007-05-01 22:32:36 +02001037 */
1038
Geert Uytterhoevenb312b382007-05-01 22:32:48 +02001039static void NCR5380_main(struct work_struct *work)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001040{
Roman Zippelc28bda22007-05-01 22:32:36 +02001041 Scsi_Cmnd *tmp, *prev;
1042 struct Scsi_Host *instance = first_instance;
1043 struct NCR5380_hostdata *hostdata = HOSTDATA(instance);
1044 int done;
1045 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046
Roman Zippelc28bda22007-05-01 22:32:36 +02001047 /*
1048 * We run (with interrupts disabled) until we're sure that none of
1049 * the host adapters have anything that can be done, at which point
1050 * we set main_running to 0 and exit.
1051 *
1052 * Interrupts are enabled before doing various other internal
1053 * instructions, after we've decided that we need to run through
1054 * the loop again.
1055 *
1056 * this should prevent any race conditions.
1057 *
1058 * ++roman: Just disabling the NCR interrupt isn't sufficient here,
1059 * because also a timer int can trigger an abort or reset, which can
1060 * alter queues and touch the Falcon lock.
1061 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001062
Roman Zippelc28bda22007-05-01 22:32:36 +02001063 /* Tell int handlers main() is now already executing. Note that
1064 no races are possible here. If an int comes in before
1065 'main_running' is set here, and queues/executes main via the
1066 task queue, it doesn't do any harm, just this instance of main
1067 won't find any work left to do. */
1068 if (main_running)
1069 return;
1070 main_running = 1;
1071
1072 local_save_flags(flags);
1073 do {
1074 local_irq_disable(); /* Freeze request queues */
1075 done = 1;
1076
1077 if (!hostdata->connected) {
1078 MAIN_PRINTK("scsi%d: not connected\n", HOSTNO);
1079 /*
1080 * Search through the issue_queue for a command destined
1081 * for a target that's not busy.
1082 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001083#if (NDEBUG & NDEBUG_LISTS)
Roman Zippelc28bda22007-05-01 22:32:36 +02001084 for (tmp = (Scsi_Cmnd *) hostdata->issue_queue, prev = NULL;
1085 tmp && (tmp != prev); prev = tmp, tmp = NEXT(tmp))
1086 ;
1087 /*printk("%p ", tmp);*/
1088 if ((tmp == prev) && tmp)
1089 printk(" LOOP\n");
1090 /* else printk("\n"); */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001091#endif
Roman Zippelc28bda22007-05-01 22:32:36 +02001092 for (tmp = (Scsi_Cmnd *) hostdata->issue_queue,
1093 prev = NULL; tmp; prev = tmp, tmp = NEXT(tmp)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001094
1095#if (NDEBUG & NDEBUG_LISTS)
Roman Zippelc28bda22007-05-01 22:32:36 +02001096 if (prev != tmp)
1097 printk("MAIN tmp=%p target=%d busy=%d lun=%d\n",
1098 tmp, tmp->device->id, hostdata->busy[tmp->device->id],
1099 tmp->device->lun);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001100#endif
Roman Zippelc28bda22007-05-01 22:32:36 +02001101 /* When we find one, remove it from the issue queue. */
1102 /* ++guenther: possible race with Falcon locking */
1103 if (
Linus Torvalds1da177e2005-04-16 15:20:36 -07001104#ifdef SUPPORT_TAGS
Roman Zippelc28bda22007-05-01 22:32:36 +02001105 !is_lun_busy( tmp, tmp->cmnd[0] != REQUEST_SENSE)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001106#else
Roman Zippelc28bda22007-05-01 22:32:36 +02001107 !(hostdata->busy[tmp->device->id] & (1 << tmp->device->lun))
1108#endif
1109 ) {
1110 /* ++guenther: just to be sure, this must be atomic */
1111 local_irq_disable();
1112 if (prev) {
1113 REMOVE(prev, NEXT(prev), tmp, NEXT(tmp));
Roman Zippel3130d902007-05-01 22:32:37 +02001114 SET_NEXT(prev, NEXT(tmp));
Roman Zippelc28bda22007-05-01 22:32:36 +02001115 } else {
1116 REMOVE(-1, hostdata->issue_queue, tmp, NEXT(tmp));
1117 hostdata->issue_queue = NEXT(tmp);
1118 }
Roman Zippel3130d902007-05-01 22:32:37 +02001119 SET_NEXT(tmp, NULL);
Roman Zippelc28bda22007-05-01 22:32:36 +02001120 falcon_dont_release++;
1121
1122 /* reenable interrupts after finding one */
1123 local_irq_restore(flags);
1124
1125 /*
1126 * Attempt to establish an I_T_L nexus here.
1127 * On success, instance->hostdata->connected is set.
1128 * On failure, we must add the command back to the
1129 * issue queue so we can keep trying.
1130 */
1131 MAIN_PRINTK("scsi%d: main(): command for target %d "
1132 "lun %d removed from issue_queue\n",
1133 HOSTNO, tmp->device->id, tmp->device->lun);
1134 /*
1135 * REQUEST SENSE commands are issued without tagged
1136 * queueing, even on SCSI-II devices because the
1137 * contingent allegiance condition exists for the
1138 * entire unit.
1139 */
1140 /* ++roman: ...and the standard also requires that
1141 * REQUEST SENSE command are untagged.
1142 */
1143
1144#ifdef SUPPORT_TAGS
1145 cmd_get_tag(tmp, tmp->cmnd[0] != REQUEST_SENSE);
1146#endif
1147 if (!NCR5380_select(instance, tmp,
1148 (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE :
1149 TAG_NEXT)) {
1150 falcon_dont_release--;
1151 /* release if target did not response! */
1152 falcon_release_lock_if_possible(hostdata);
1153 break;
1154 } else {
1155 local_irq_disable();
1156 LIST(tmp, hostdata->issue_queue);
Roman Zippel3130d902007-05-01 22:32:37 +02001157 SET_NEXT(tmp, hostdata->issue_queue);
Roman Zippelc28bda22007-05-01 22:32:36 +02001158 hostdata->issue_queue = tmp;
1159#ifdef SUPPORT_TAGS
1160 cmd_free_tag(tmp);
1161#endif
1162 falcon_dont_release--;
1163 local_irq_restore(flags);
1164 MAIN_PRINTK("scsi%d: main(): select() failed, "
1165 "returned to issue_queue\n", HOSTNO);
1166 if (hostdata->connected)
1167 break;
1168 }
1169 } /* if target/lun/target queue is not busy */
1170 } /* for issue_queue */
1171 } /* if (!hostdata->connected) */
1172
1173 if (hostdata->connected
1174#ifdef REAL_DMA
1175 && !hostdata->dma_len
Linus Torvalds1da177e2005-04-16 15:20:36 -07001176#endif
1177 ) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001178 local_irq_restore(flags);
Roman Zippelc28bda22007-05-01 22:32:36 +02001179 MAIN_PRINTK("scsi%d: main: performing information transfer\n",
1180 HOSTNO);
1181 NCR5380_information_transfer(instance);
1182 MAIN_PRINTK("scsi%d: main: done set false\n", HOSTNO);
1183 done = 0;
1184 }
1185 } while (!done);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001186
Roman Zippelc28bda22007-05-01 22:32:36 +02001187 /* Better allow ints _after_ 'main_running' has been cleared, else
1188 an interrupt could believe we'll pick up the work it left for
1189 us, but we won't see it anymore here... */
1190 main_running = 0;
1191 local_irq_restore(flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001192}
1193
1194
1195#ifdef REAL_DMA
1196/*
1197 * Function : void NCR5380_dma_complete (struct Scsi_Host *instance)
1198 *
1199 * Purpose : Called by interrupt handler when DMA finishes or a phase
Roman Zippelc28bda22007-05-01 22:32:36 +02001200 * mismatch occurs (which would finish the DMA transfer).
Linus Torvalds1da177e2005-04-16 15:20:36 -07001201 *
1202 * Inputs : instance - this instance of the NCR5380.
1203 *
1204 */
1205
Roman Zippelc28bda22007-05-01 22:32:36 +02001206static void NCR5380_dma_complete(struct Scsi_Host *instance)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001207{
Roman Zippelc28bda22007-05-01 22:32:36 +02001208 SETUP_HOSTDATA(instance);
1209 int transfered, saved_data = 0, overrun = 0, cnt, toPIO;
1210 unsigned char **data, p;
1211 volatile int *count;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001212
Roman Zippelc28bda22007-05-01 22:32:36 +02001213 if (!hostdata->connected) {
1214 printk(KERN_WARNING "scsi%d: received end of DMA interrupt with "
1215 "no connected cmd\n", HOSTNO);
1216 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001217 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001218
Roman Zippelc28bda22007-05-01 22:32:36 +02001219 if (atari_read_overruns) {
1220 p = hostdata->connected->SCp.phase;
1221 if (p & SR_IO) {
1222 udelay(10);
1223 if ((NCR5380_read(BUS_AND_STATUS_REG) &
1224 (BASR_PHASE_MATCH|BASR_ACK)) ==
1225 (BASR_PHASE_MATCH|BASR_ACK)) {
1226 saved_data = NCR5380_read(INPUT_DATA_REG);
1227 overrun = 1;
1228 DMA_PRINTK("scsi%d: read overrun handled\n", HOSTNO);
1229 }
1230 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001231 }
Roman Zippelc28bda22007-05-01 22:32:36 +02001232
1233 DMA_PRINTK("scsi%d: real DMA transfer complete, basr 0x%X, sr 0x%X\n",
1234 HOSTNO, NCR5380_read(BUS_AND_STATUS_REG),
1235 NCR5380_read(STATUS_REG));
1236
1237 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1238 NCR5380_write(MODE_REG, MR_BASE);
1239 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1240
1241 transfered = hostdata->dma_len - NCR5380_dma_residual(instance);
1242 hostdata->dma_len = 0;
1243
1244 data = (unsigned char **)&hostdata->connected->SCp.ptr;
1245 count = &hostdata->connected->SCp.this_residual;
1246 *data += transfered;
1247 *count -= transfered;
1248
1249 if (atari_read_overruns) {
1250 if ((NCR5380_read(STATUS_REG) & PHASE_MASK) == p && (p & SR_IO)) {
1251 cnt = toPIO = atari_read_overruns;
1252 if (overrun) {
1253 DMA_PRINTK("Got an input overrun, using saved byte\n");
1254 *(*data)++ = saved_data;
1255 (*count)--;
1256 cnt--;
1257 toPIO--;
1258 }
1259 DMA_PRINTK("Doing %d-byte PIO to 0x%08lx\n", cnt, (long)*data);
1260 NCR5380_transfer_pio(instance, &p, &cnt, data);
1261 *count -= toPIO - cnt;
1262 }
1263 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001264}
1265#endif /* REAL_DMA */
1266
1267
1268/*
1269 * Function : void NCR5380_intr (int irq)
Roman Zippelc28bda22007-05-01 22:32:36 +02001270 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001271 * Purpose : handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses
Roman Zippelc28bda22007-05-01 22:32:36 +02001272 * from the disconnected queue, and restarting NCR5380_main()
Linus Torvalds1da177e2005-04-16 15:20:36 -07001273 * as required.
1274 *
1275 * Inputs : int irq, irq that caused this interrupt.
1276 *
1277 */
1278
Roman Zippelc28bda22007-05-01 22:32:36 +02001279static irqreturn_t NCR5380_intr(int irq, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001280{
Roman Zippelc28bda22007-05-01 22:32:36 +02001281 struct Scsi_Host *instance = first_instance;
1282 int done = 1, handled = 0;
1283 unsigned char basr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001284
Roman Zippelc28bda22007-05-01 22:32:36 +02001285 INT_PRINTK("scsi%d: NCR5380 irq triggered\n", HOSTNO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001286
Roman Zippelc28bda22007-05-01 22:32:36 +02001287 /* Look for pending interrupts */
1288 basr = NCR5380_read(BUS_AND_STATUS_REG);
1289 INT_PRINTK("scsi%d: BASR=%02x\n", HOSTNO, basr);
1290 /* dispatch to appropriate routine if found and done=0 */
1291 if (basr & BASR_IRQ) {
1292 NCR_PRINT(NDEBUG_INTR);
1293 if ((NCR5380_read(STATUS_REG) & (SR_SEL|SR_IO)) == (SR_SEL|SR_IO)) {
1294 done = 0;
1295 ENABLE_IRQ();
1296 INT_PRINTK("scsi%d: SEL interrupt\n", HOSTNO);
1297 NCR5380_reselect(instance);
1298 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1299 } else if (basr & BASR_PARITY_ERROR) {
1300 INT_PRINTK("scsi%d: PARITY interrupt\n", HOSTNO);
1301 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1302 } else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) {
1303 INT_PRINTK("scsi%d: RESET interrupt\n", HOSTNO);
1304 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1305 } else {
1306 /*
1307 * The rest of the interrupt conditions can occur only during a
1308 * DMA transfer
1309 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001310
1311#if defined(REAL_DMA)
Roman Zippelc28bda22007-05-01 22:32:36 +02001312 /*
1313 * We should only get PHASE MISMATCH and EOP interrupts if we have
1314 * DMA enabled, so do a sanity check based on the current setting
1315 * of the MODE register.
1316 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001317
Roman Zippelc28bda22007-05-01 22:32:36 +02001318 if ((NCR5380_read(MODE_REG) & MR_DMA_MODE) &&
1319 ((basr & BASR_END_DMA_TRANSFER) ||
1320 !(basr & BASR_PHASE_MATCH))) {
1321
1322 INT_PRINTK("scsi%d: PHASE MISM or EOP interrupt\n", HOSTNO);
1323 NCR5380_dma_complete( instance );
1324 done = 0;
1325 ENABLE_IRQ();
1326 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -07001327#endif /* REAL_DMA */
Roman Zippelc28bda22007-05-01 22:32:36 +02001328 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001329/* MS: Ignore unknown phase mismatch interrupts (caused by EOP interrupt) */
Roman Zippelc28bda22007-05-01 22:32:36 +02001330 if (basr & BASR_PHASE_MATCH)
1331 printk(KERN_NOTICE "scsi%d: unknown interrupt, "
1332 "BASR 0x%x, MR 0x%x, SR 0x%x\n",
1333 HOSTNO, basr, NCR5380_read(MODE_REG),
1334 NCR5380_read(STATUS_REG));
1335 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1336 }
1337 } /* if !(SELECTION || PARITY) */
1338 handled = 1;
1339 } /* BASR & IRQ */ else {
1340 printk(KERN_NOTICE "scsi%d: interrupt without IRQ bit set in BASR, "
1341 "BASR 0x%X, MR 0x%X, SR 0x%x\n", HOSTNO, basr,
1342 NCR5380_read(MODE_REG), NCR5380_read(STATUS_REG));
1343 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1344 }
1345
1346 if (!done) {
1347 INT_PRINTK("scsi%d: in int routine, calling main\n", HOSTNO);
1348 /* Put a call to NCR5380_main() on the queue... */
1349 queue_main();
1350 }
1351 return IRQ_RETVAL(handled);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001352}
1353
1354#ifdef NCR5380_STATS
Roman Zippelc28bda22007-05-01 22:32:36 +02001355static void collect_stats(struct NCR5380_hostdata* hostdata, Scsi_Cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001356{
1357# ifdef NCR5380_STAT_LIMIT
Boaz Harrosh9e0fe442007-11-05 11:23:35 +02001358 if (scsi_bufflen(cmd) > NCR5380_STAT_LIMIT)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001359# endif
Roman Zippelc28bda22007-05-01 22:32:36 +02001360 switch (cmd->cmnd[0]) {
1361 case WRITE:
1362 case WRITE_6:
1363 case WRITE_10:
1364 hostdata->time_write[cmd->device->id] += (jiffies - hostdata->timebase);
Boaz Harrosh9e0fe442007-11-05 11:23:35 +02001365 /*hostdata->bytes_write[cmd->device->id] += scsi_bufflen(cmd);*/
Roman Zippelc28bda22007-05-01 22:32:36 +02001366 hostdata->pendingw--;
1367 break;
1368 case READ:
1369 case READ_6:
1370 case READ_10:
1371 hostdata->time_read[cmd->device->id] += (jiffies - hostdata->timebase);
Boaz Harrosh9e0fe442007-11-05 11:23:35 +02001372 /*hostdata->bytes_read[cmd->device->id] += scsi_bufflen(cmd);*/
Roman Zippelc28bda22007-05-01 22:32:36 +02001373 hostdata->pendingr--;
1374 break;
1375 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001376}
1377#endif
1378
Roman Zippelc28bda22007-05-01 22:32:36 +02001379/*
1380 * Function : int NCR5380_select (struct Scsi_Host *instance, Scsi_Cmnd *cmd,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001381 * int tag);
1382 *
1383 * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command,
Roman Zippelc28bda22007-05-01 22:32:36 +02001384 * including ARBITRATION, SELECTION, and initial message out for
1385 * IDENTIFY and queue messages.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001386 *
Roman Zippelc28bda22007-05-01 22:32:36 +02001387 * Inputs : instance - instantiation of the 5380 driver on which this
1388 * target lives, cmd - SCSI command to execute, tag - set to TAG_NEXT for
1389 * new tag, TAG_NONE for untagged queueing, otherwise set to the tag for
Linus Torvalds1da177e2005-04-16 15:20:36 -07001390 * the command that is presently connected.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001391 *
Roman Zippelc28bda22007-05-01 22:32:36 +02001392 * Returns : -1 if selection could not execute for some reason,
1393 * 0 if selection succeeded or failed because the target
1394 * did not respond.
1395 *
1396 * Side effects :
1397 * If bus busy, arbitration failed, etc, NCR5380_select() will exit
Linus Torvalds1da177e2005-04-16 15:20:36 -07001398 * with registers as they should have been on entry - ie
1399 * SELECT_ENABLE will be set appropriately, the NCR5380
1400 * will cease to drive any SCSI bus signals.
1401 *
Roman Zippelc28bda22007-05-01 22:32:36 +02001402 * If successful : I_T_L or I_T_L_Q nexus will be established,
1403 * instance->connected will be set to cmd.
1404 * SELECT interrupt will be disabled.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001405 *
Roman Zippelc28bda22007-05-01 22:32:36 +02001406 * If failed (no target) : cmd->scsi_done() will be called, and the
Linus Torvalds1da177e2005-04-16 15:20:36 -07001407 * cmd->result host byte set to DID_BAD_TARGET.
1408 */
1409
Roman Zippelc28bda22007-05-01 22:32:36 +02001410static int NCR5380_select(struct Scsi_Host *instance, Scsi_Cmnd *cmd, int tag)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001411{
Roman Zippelc28bda22007-05-01 22:32:36 +02001412 SETUP_HOSTDATA(instance);
1413 unsigned char tmp[3], phase;
1414 unsigned char *data;
1415 int len;
1416 unsigned long timeout;
1417 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001418
Roman Zippelc28bda22007-05-01 22:32:36 +02001419 hostdata->restart_select = 0;
1420 NCR_PRINT(NDEBUG_ARBITRATION);
1421 ARB_PRINTK("scsi%d: starting arbitration, id = %d\n", HOSTNO,
1422 instance->this_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001423
Roman Zippelc28bda22007-05-01 22:32:36 +02001424 /*
1425 * Set the phase bits to 0, otherwise the NCR5380 won't drive the
1426 * data bus during SELECTION.
1427 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001428
Roman Zippelc28bda22007-05-01 22:32:36 +02001429 local_irq_save(flags);
1430 if (hostdata->connected) {
1431 local_irq_restore(flags);
1432 return -1;
1433 }
1434 NCR5380_write(TARGET_COMMAND_REG, 0);
1435
1436 /*
1437 * Start arbitration.
1438 */
1439
1440 NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
1441 NCR5380_write(MODE_REG, MR_ARBITRATE);
1442
Linus Torvalds1da177e2005-04-16 15:20:36 -07001443 local_irq_restore(flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001444
Roman Zippelc28bda22007-05-01 22:32:36 +02001445 /* Wait for arbitration logic to complete */
Michael Schmitzfb810d12007-05-01 22:32:35 +02001446#if defined(NCR_TIMEOUT)
Roman Zippelc28bda22007-05-01 22:32:36 +02001447 {
1448 unsigned long timeout = jiffies + 2*NCR_TIMEOUT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001449
Roman Zippelc28bda22007-05-01 22:32:36 +02001450 while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS) &&
1451 time_before(jiffies, timeout) && !hostdata->connected)
1452 ;
1453 if (time_after_eq(jiffies, timeout)) {
1454 printk("scsi : arbitration timeout at %d\n", __LINE__);
1455 NCR5380_write(MODE_REG, MR_BASE);
1456 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1457 return -1;
1458 }
1459 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001460#else /* NCR_TIMEOUT */
Roman Zippelc28bda22007-05-01 22:32:36 +02001461 while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS) &&
1462 !hostdata->connected)
1463 ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001464#endif
1465
Roman Zippelc28bda22007-05-01 22:32:36 +02001466 ARB_PRINTK("scsi%d: arbitration complete\n", HOSTNO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001467
Roman Zippelc28bda22007-05-01 22:32:36 +02001468 if (hostdata->connected) {
1469 NCR5380_write(MODE_REG, MR_BASE);
1470 return -1;
1471 }
1472 /*
1473 * The arbitration delay is 2.2us, but this is a minimum and there is
1474 * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate
1475 * the integral nature of udelay().
1476 *
1477 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001478
Roman Zippelc28bda22007-05-01 22:32:36 +02001479 udelay(3);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001480
Roman Zippelc28bda22007-05-01 22:32:36 +02001481 /* Check for lost arbitration */
1482 if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1483 (NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_higher_mask) ||
1484 (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1485 hostdata->connected) {
1486 NCR5380_write(MODE_REG, MR_BASE);
1487 ARB_PRINTK("scsi%d: lost arbitration, deasserting MR_ARBITRATE\n",
1488 HOSTNO);
1489 return -1;
1490 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001491
Roman Zippelc28bda22007-05-01 22:32:36 +02001492 /* after/during arbitration, BSY should be asserted.
1493 IBM DPES-31080 Version S31Q works now */
1494 /* Tnx to Thomas_Roesch@m2.maus.de for finding this! (Roman) */
1495 NCR5380_write(INITIATOR_COMMAND_REG,
1496 ICR_BASE | ICR_ASSERT_SEL | ICR_ASSERT_BSY);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001497
Roman Zippelc28bda22007-05-01 22:32:36 +02001498 if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1499 hostdata->connected) {
1500 NCR5380_write(MODE_REG, MR_BASE);
1501 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1502 ARB_PRINTK("scsi%d: lost arbitration, deasserting ICR_ASSERT_SEL\n",
1503 HOSTNO);
1504 return -1;
1505 }
1506
1507 /*
1508 * Again, bus clear + bus settle time is 1.2us, however, this is
1509 * a minimum so we'll udelay ceil(1.2)
1510 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001511
1512#ifdef CONFIG_ATARI_SCSI_TOSHIBA_DELAY
Roman Zippelc28bda22007-05-01 22:32:36 +02001513 /* ++roman: But some targets (see above :-) seem to need a bit more... */
1514 udelay(15);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001515#else
Roman Zippelc28bda22007-05-01 22:32:36 +02001516 udelay(2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001517#endif
Roman Zippelc28bda22007-05-01 22:32:36 +02001518
1519 if (hostdata->connected) {
1520 NCR5380_write(MODE_REG, MR_BASE);
1521 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1522 return -1;
1523 }
1524
1525 ARB_PRINTK("scsi%d: won arbitration\n", HOSTNO);
1526
1527 /*
1528 * Now that we have won arbitration, start Selection process, asserting
1529 * the host and target ID's on the SCSI bus.
1530 */
1531
1532 NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << cmd->device->id)));
1533
1534 /*
1535 * Raise ATN while SEL is true before BSY goes false from arbitration,
1536 * since this is the only way to guarantee that we'll get a MESSAGE OUT
1537 * phase immediately after selection.
1538 */
1539
1540 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY |
1541 ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL ));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001542 NCR5380_write(MODE_REG, MR_BASE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001543
Roman Zippelc28bda22007-05-01 22:32:36 +02001544 /*
1545 * Reselect interrupts must be turned off prior to the dropping of BSY,
1546 * otherwise we will trigger an interrupt.
1547 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001548
Roman Zippelc28bda22007-05-01 22:32:36 +02001549 if (hostdata->connected) {
1550 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1551 return -1;
1552 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001553
Roman Zippelc28bda22007-05-01 22:32:36 +02001554 NCR5380_write(SELECT_ENABLE_REG, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001555
Roman Zippelc28bda22007-05-01 22:32:36 +02001556 /*
1557 * The initiator shall then wait at least two deskew delays and release
1558 * the BSY signal.
1559 */
1560 udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001561
Roman Zippelc28bda22007-05-01 22:32:36 +02001562 /* Reset BSY */
1563 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA |
1564 ICR_ASSERT_ATN | ICR_ASSERT_SEL));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001565
Roman Zippelc28bda22007-05-01 22:32:36 +02001566 /*
1567 * Something weird happens when we cease to drive BSY - looks
1568 * like the board/chip is letting us do another read before the
1569 * appropriate propagation delay has expired, and we're confusing
1570 * a BSY signal from ourselves as the target's response to SELECTION.
1571 *
1572 * A small delay (the 'C++' frontend breaks the pipeline with an
1573 * unnecessary jump, making it work on my 386-33/Trantor T128, the
1574 * tighter 'C' code breaks and requires this) solves the problem -
1575 * the 1 us delay is arbitrary, and only used because this delay will
1576 * be the same on other platforms and since it works here, it should
1577 * work there.
1578 *
1579 * wingel suggests that this could be due to failing to wait
1580 * one deskew delay.
1581 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001582
Roman Zippelc28bda22007-05-01 22:32:36 +02001583 udelay(1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001584
Roman Zippelc28bda22007-05-01 22:32:36 +02001585 SEL_PRINTK("scsi%d: selecting target %d\n", HOSTNO, cmd->device->id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001586
Roman Zippelc28bda22007-05-01 22:32:36 +02001587 /*
1588 * The SCSI specification calls for a 250 ms timeout for the actual
1589 * selection.
1590 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001591
Roman Zippelc28bda22007-05-01 22:32:36 +02001592 timeout = jiffies + 25;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001593
Roman Zippelc28bda22007-05-01 22:32:36 +02001594 /*
1595 * XXX very interesting - we're seeing a bounce where the BSY we
1596 * asserted is being reflected / still asserted (propagation delay?)
1597 * and it's detecting as true. Sigh.
1598 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001599
1600#if 0
Roman Zippelc28bda22007-05-01 22:32:36 +02001601 /* ++roman: If a target conformed to the SCSI standard, it wouldn't assert
1602 * IO while SEL is true. But again, there are some disks out the in the
1603 * world that do that nevertheless. (Somebody claimed that this announces
1604 * reselection capability of the target.) So we better skip that test and
1605 * only wait for BSY... (Famous german words: Der Klügere gibt nach :-)
1606 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001607
Roman Zippelc28bda22007-05-01 22:32:36 +02001608 while (time_before(jiffies, timeout) &&
1609 !(NCR5380_read(STATUS_REG) & (SR_BSY | SR_IO)))
1610 ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001611
Roman Zippelc28bda22007-05-01 22:32:36 +02001612 if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) {
1613 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1614 NCR5380_reselect(instance);
1615 printk(KERN_ERR "scsi%d: reselection after won arbitration?\n",
1616 HOSTNO);
1617 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1618 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001619 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001620#else
Roman Zippelc28bda22007-05-01 22:32:36 +02001621 while (time_before(jiffies, timeout) && !(NCR5380_read(STATUS_REG) & SR_BSY))
1622 ;
1623#endif
1624
1625 /*
1626 * No less than two deskew delays after the initiator detects the
1627 * BSY signal is true, it shall release the SEL signal and may
1628 * change the DATA BUS. -wingel
1629 */
1630
1631 udelay(1);
1632
1633 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1634
1635 if (!(NCR5380_read(STATUS_REG) & SR_BSY)) {
1636 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1637 if (hostdata->targets_present & (1 << cmd->device->id)) {
1638 printk(KERN_ERR "scsi%d: weirdness\n", HOSTNO);
1639 if (hostdata->restart_select)
1640 printk(KERN_NOTICE "\trestart select\n");
1641 NCR_PRINT(NDEBUG_ANY);
1642 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1643 return -1;
1644 }
1645 cmd->result = DID_BAD_TARGET << 16;
1646#ifdef NCR5380_STATS
1647 collect_stats(hostdata, cmd);
1648#endif
1649#ifdef SUPPORT_TAGS
1650 cmd_free_tag(cmd);
1651#endif
1652 cmd->scsi_done(cmd);
1653 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1654 SEL_PRINTK("scsi%d: target did not respond within 250ms\n", HOSTNO);
1655 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1656 return 0;
1657 }
1658
1659 hostdata->targets_present |= (1 << cmd->device->id);
1660
1661 /*
1662 * Since we followed the SCSI spec, and raised ATN while SEL
1663 * was true but before BSY was false during selection, the information
1664 * transfer phase should be a MESSAGE OUT phase so that we can send the
1665 * IDENTIFY message.
1666 *
1667 * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG
1668 * message (2 bytes) with a tag ID that we increment with every command
1669 * until it wraps back to 0.
1670 *
1671 * XXX - it turns out that there are some broken SCSI-II devices,
1672 * which claim to support tagged queuing but fail when more than
1673 * some number of commands are issued at once.
1674 */
1675
1676 /* Wait for start of REQ/ACK handshake */
1677 while (!(NCR5380_read(STATUS_REG) & SR_REQ))
1678 ;
1679
1680 SEL_PRINTK("scsi%d: target %d selected, going into MESSAGE OUT phase.\n",
1681 HOSTNO, cmd->device->id);
1682 tmp[0] = IDENTIFY(1, cmd->device->lun);
1683
1684#ifdef SUPPORT_TAGS
1685 if (cmd->tag != TAG_NONE) {
1686 tmp[1] = hostdata->last_message = SIMPLE_QUEUE_TAG;
1687 tmp[2] = cmd->tag;
1688 len = 3;
1689 } else
1690 len = 1;
1691#else
1692 len = 1;
1693 cmd->tag = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001694#endif /* SUPPORT_TAGS */
1695
Roman Zippelc28bda22007-05-01 22:32:36 +02001696 /* Send message(s) */
1697 data = tmp;
1698 phase = PHASE_MSGOUT;
1699 NCR5380_transfer_pio(instance, &phase, &len, &data);
1700 SEL_PRINTK("scsi%d: nexus established.\n", HOSTNO);
1701 /* XXX need to handle errors here */
1702 hostdata->connected = cmd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001703#ifndef SUPPORT_TAGS
Roman Zippelc28bda22007-05-01 22:32:36 +02001704 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
1705#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001706
Roman Zippelc28bda22007-05-01 22:32:36 +02001707 initialize_SCp(cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001708
Roman Zippelc28bda22007-05-01 22:32:36 +02001709 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001710}
1711
Roman Zippelc28bda22007-05-01 22:32:36 +02001712/*
1713 * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001714 * unsigned char *phase, int *count, unsigned char **data)
1715 *
1716 * Purpose : transfers data in given phase using polled I/O
1717 *
Roman Zippelc28bda22007-05-01 22:32:36 +02001718 * Inputs : instance - instance of driver, *phase - pointer to
1719 * what phase is expected, *count - pointer to number of
Linus Torvalds1da177e2005-04-16 15:20:36 -07001720 * bytes to transfer, **data - pointer to data pointer.
Roman Zippelc28bda22007-05-01 22:32:36 +02001721 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001722 * Returns : -1 when different phase is entered without transferring
Lucas De Marchi25985ed2011-03-30 22:57:33 -03001723 * maximum number of bytes, 0 if all bytes are transferred or exit
Linus Torvalds1da177e2005-04-16 15:20:36 -07001724 * is in same phase.
1725 *
Roman Zippelc28bda22007-05-01 22:32:36 +02001726 * Also, *phase, *count, *data are modified in place.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001727 *
1728 * XXX Note : handling for bus free may be useful.
1729 */
1730
1731/*
Roman Zippelc28bda22007-05-01 22:32:36 +02001732 * Note : this code is not as quick as it could be, however it
Linus Torvalds1da177e2005-04-16 15:20:36 -07001733 * IS 100% reliable, and for the actual data transfer where speed
1734 * counts, we will always do a pseudo DMA or DMA transfer.
1735 */
1736
Roman Zippelc28bda22007-05-01 22:32:36 +02001737static int NCR5380_transfer_pio(struct Scsi_Host *instance,
1738 unsigned char *phase, int *count,
1739 unsigned char **data)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001740{
Roman Zippelc28bda22007-05-01 22:32:36 +02001741 register unsigned char p = *phase, tmp;
1742 register int c = *count;
1743 register unsigned char *d = *data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001744
Roman Zippelc28bda22007-05-01 22:32:36 +02001745 /*
1746 * The NCR5380 chip will only drive the SCSI bus when the
1747 * phase specified in the appropriate bits of the TARGET COMMAND
1748 * REGISTER match the STATUS REGISTER
Linus Torvalds1da177e2005-04-16 15:20:36 -07001749 */
1750
Roman Zippelc28bda22007-05-01 22:32:36 +02001751 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001752
Roman Zippelc28bda22007-05-01 22:32:36 +02001753 do {
1754 /*
1755 * Wait for assertion of REQ, after which the phase bits will be
1756 * valid
1757 */
1758 while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ))
1759 ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001760
Roman Zippelc28bda22007-05-01 22:32:36 +02001761 HSH_PRINTK("scsi%d: REQ detected\n", HOSTNO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001762
Roman Zippelc28bda22007-05-01 22:32:36 +02001763 /* Check for phase mismatch */
1764 if ((tmp & PHASE_MASK) != p) {
1765 PIO_PRINTK("scsi%d: phase mismatch\n", HOSTNO);
1766 NCR_PRINT_PHASE(NDEBUG_PIO);
1767 break;
1768 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001769
Roman Zippelc28bda22007-05-01 22:32:36 +02001770 /* Do actual transfer from SCSI bus to / from memory */
1771 if (!(p & SR_IO))
1772 NCR5380_write(OUTPUT_DATA_REG, *d);
1773 else
1774 *d = NCR5380_read(CURRENT_SCSI_DATA_REG);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001775
Roman Zippelc28bda22007-05-01 22:32:36 +02001776 ++d;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001777
Roman Zippelc28bda22007-05-01 22:32:36 +02001778 /*
1779 * The SCSI standard suggests that in MSGOUT phase, the initiator
1780 * should drop ATN on the last byte of the message phase
1781 * after REQ has been asserted for the handshake but before
1782 * the initiator raises ACK.
1783 */
1784
1785 if (!(p & SR_IO)) {
1786 if (!((p & SR_MSG) && c > 1)) {
1787 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA);
1788 NCR_PRINT(NDEBUG_PIO);
1789 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1790 ICR_ASSERT_DATA | ICR_ASSERT_ACK);
1791 } else {
1792 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1793 ICR_ASSERT_DATA | ICR_ASSERT_ATN);
1794 NCR_PRINT(NDEBUG_PIO);
1795 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1796 ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
1797 }
1798 } else {
1799 NCR_PRINT(NDEBUG_PIO);
1800 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK);
1801 }
1802
1803 while (NCR5380_read(STATUS_REG) & SR_REQ)
1804 ;
1805
1806 HSH_PRINTK("scsi%d: req false, handshake complete\n", HOSTNO);
1807
1808 /*
1809 * We have several special cases to consider during REQ/ACK handshaking :
1810 * 1. We were in MSGOUT phase, and we are on the last byte of the
1811 * message. ATN must be dropped as ACK is dropped.
1812 *
1813 * 2. We are in a MSGIN phase, and we are on the last byte of the
1814 * message. We must exit with ACK asserted, so that the calling
1815 * code may raise ATN before dropping ACK to reject the message.
1816 *
1817 * 3. ACK and ATN are clear and the target may proceed as normal.
1818 */
1819 if (!(p == PHASE_MSGIN && c == 1)) {
1820 if (p == PHASE_MSGOUT && c > 1)
1821 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1822 else
1823 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1824 }
1825 } while (--c);
1826
1827 PIO_PRINTK("scsi%d: residual %d\n", HOSTNO, c);
1828
1829 *count = c;
1830 *data = d;
1831 tmp = NCR5380_read(STATUS_REG);
1832 /* The phase read from the bus is valid if either REQ is (already)
1833 * asserted or if ACK hasn't been released yet. The latter is the case if
1834 * we're in MSGIN and all wanted bytes have been received.
1835 */
1836 if ((tmp & SR_REQ) || (p == PHASE_MSGIN && c == 0))
1837 *phase = tmp & PHASE_MASK;
1838 else
1839 *phase = PHASE_UNKNOWN;
1840
1841 if (!c || (*phase == p))
1842 return 0;
1843 else
1844 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001845}
1846
1847/*
1848 * Function : do_abort (Scsi_Host *host)
Roman Zippelc28bda22007-05-01 22:32:36 +02001849 *
1850 * Purpose : abort the currently established nexus. Should only be
1851 * called from a routine which can drop into a
1852 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001853 * Returns : 0 on success, -1 on failure.
1854 */
1855
Roman Zippelc28bda22007-05-01 22:32:36 +02001856static int do_abort(struct Scsi_Host *host)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001857{
Roman Zippelc28bda22007-05-01 22:32:36 +02001858 unsigned char tmp, *msgptr, phase;
1859 int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001860
Roman Zippelc28bda22007-05-01 22:32:36 +02001861 /* Request message out phase */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001862 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001863
Roman Zippelc28bda22007-05-01 22:32:36 +02001864 /*
1865 * Wait for the target to indicate a valid phase by asserting
1866 * REQ. Once this happens, we'll have either a MSGOUT phase
1867 * and can immediately send the ABORT message, or we'll have some
1868 * other phase and will have to source/sink data.
1869 *
1870 * We really don't care what value was on the bus or what value
1871 * the target sees, so we just handshake.
1872 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001873
Roel Kluin3be38e72007-11-15 21:13:46 +01001874 while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ))
Roman Zippelc28bda22007-05-01 22:32:36 +02001875 ;
1876
1877 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
1878
1879 if ((tmp & PHASE_MASK) != PHASE_MSGOUT) {
1880 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN |
1881 ICR_ASSERT_ACK);
1882 while (NCR5380_read(STATUS_REG) & SR_REQ)
1883 ;
1884 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1885 }
1886
1887 tmp = ABORT;
1888 msgptr = &tmp;
1889 len = 1;
1890 phase = PHASE_MSGOUT;
1891 NCR5380_transfer_pio(host, &phase, &len, &msgptr);
1892
1893 /*
1894 * If we got here, and the command completed successfully,
1895 * we're about to go into bus free state.
1896 */
1897
1898 return len ? -1 : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001899}
1900
1901#if defined(REAL_DMA)
Roman Zippelc28bda22007-05-01 22:32:36 +02001902/*
1903 * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001904 * unsigned char *phase, int *count, unsigned char **data)
1905 *
1906 * Purpose : transfers data in given phase using either real
1907 * or pseudo DMA.
1908 *
Roman Zippelc28bda22007-05-01 22:32:36 +02001909 * Inputs : instance - instance of driver, *phase - pointer to
1910 * what phase is expected, *count - pointer to number of
Linus Torvalds1da177e2005-04-16 15:20:36 -07001911 * bytes to transfer, **data - pointer to data pointer.
Roman Zippelc28bda22007-05-01 22:32:36 +02001912 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001913 * Returns : -1 when different phase is entered without transferring
Lucas De Marchi25985ed2011-03-30 22:57:33 -03001914 * maximum number of bytes, 0 if all bytes or transferred or exit
Linus Torvalds1da177e2005-04-16 15:20:36 -07001915 * is in same phase.
1916 *
Roman Zippelc28bda22007-05-01 22:32:36 +02001917 * Also, *phase, *count, *data are modified in place.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001918 *
1919 */
1920
1921
Roman Zippelc28bda22007-05-01 22:32:36 +02001922static int NCR5380_transfer_dma(struct Scsi_Host *instance,
1923 unsigned char *phase, int *count,
1924 unsigned char **data)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001925{
Roman Zippelc28bda22007-05-01 22:32:36 +02001926 SETUP_HOSTDATA(instance);
1927 register int c = *count;
1928 register unsigned char p = *phase;
1929 register unsigned char *d = *data;
1930 unsigned char tmp;
1931 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001932
Roman Zippelc28bda22007-05-01 22:32:36 +02001933 if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) {
1934 *phase = tmp;
1935 return -1;
1936 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001937
Roman Zippelc28bda22007-05-01 22:32:36 +02001938 if (atari_read_overruns && (p & SR_IO))
1939 c -= atari_read_overruns;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001940
Roman Zippelc28bda22007-05-01 22:32:36 +02001941 DMA_PRINTK("scsi%d: initializing DMA for %s, %d bytes %s %p\n",
1942 HOSTNO, (p & SR_IO) ? "reading" : "writing",
1943 c, (p & SR_IO) ? "to" : "from", d);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001944
Roman Zippelc28bda22007-05-01 22:32:36 +02001945 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001946
1947#ifdef REAL_DMA
Roman Zippelc28bda22007-05-01 22:32:36 +02001948 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_ENABLE_EOP_INTR | MR_MONITOR_BSY);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001949#endif /* def REAL_DMA */
1950
Roman Zippelc28bda22007-05-01 22:32:36 +02001951 if (IS_A_TT()) {
1952 /* On the Medusa, it is a must to initialize the DMA before
1953 * starting the NCR. This is also the cleaner way for the TT.
1954 */
1955 local_irq_save(flags);
1956 hostdata->dma_len = (p & SR_IO) ?
1957 NCR5380_dma_read_setup(instance, d, c) :
1958 NCR5380_dma_write_setup(instance, d, c);
1959 local_irq_restore(flags);
1960 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001961
Roman Zippelc28bda22007-05-01 22:32:36 +02001962 if (p & SR_IO)
1963 NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0);
1964 else {
1965 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA);
1966 NCR5380_write(START_DMA_SEND_REG, 0);
1967 }
1968
1969 if (!IS_A_TT()) {
1970 /* On the Falcon, the DMA setup must be done after the last */
1971 /* NCR access, else the DMA setup gets trashed!
1972 */
1973 local_irq_save(flags);
1974 hostdata->dma_len = (p & SR_IO) ?
1975 NCR5380_dma_read_setup(instance, d, c) :
1976 NCR5380_dma_write_setup(instance, d, c);
1977 local_irq_restore(flags);
1978 }
1979 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001980}
1981#endif /* defined(REAL_DMA) */
1982
1983/*
1984 * Function : NCR5380_information_transfer (struct Scsi_Host *instance)
1985 *
Roman Zippelc28bda22007-05-01 22:32:36 +02001986 * Purpose : run through the various SCSI phases and do as the target
1987 * directs us to. Operates on the currently connected command,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001988 * instance->connected.
1989 *
1990 * Inputs : instance, instance for which we are doing commands
1991 *
Roman Zippelc28bda22007-05-01 22:32:36 +02001992 * Side effects : SCSI things happen, the disconnected queue will be
Linus Torvalds1da177e2005-04-16 15:20:36 -07001993 * modified if a command disconnects, *instance->connected will
1994 * change.
1995 *
Roman Zippelc28bda22007-05-01 22:32:36 +02001996 * XXX Note : we need to watch for bus free or a reset condition here
1997 * to recover from an unexpected bus free condition.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001998 */
Roman Zippelc28bda22007-05-01 22:32:36 +02001999
2000static void NCR5380_information_transfer(struct Scsi_Host *instance)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002001{
Roman Zippelc28bda22007-05-01 22:32:36 +02002002 SETUP_HOSTDATA(instance);
2003 unsigned long flags;
2004 unsigned char msgout = NOP;
2005 int sink = 0;
2006 int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002007#if defined(REAL_DMA)
Roman Zippelc28bda22007-05-01 22:32:36 +02002008 int transfersize;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002009#endif
Roman Zippelc28bda22007-05-01 22:32:36 +02002010 unsigned char *data;
2011 unsigned char phase, tmp, extended_msg[10], old_phase = 0xff;
2012 Scsi_Cmnd *cmd = (Scsi_Cmnd *) hostdata->connected;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002013
Roman Zippelc28bda22007-05-01 22:32:36 +02002014 while (1) {
2015 tmp = NCR5380_read(STATUS_REG);
2016 /* We only have a valid SCSI phase when REQ is asserted */
2017 if (tmp & SR_REQ) {
2018 phase = (tmp & PHASE_MASK);
2019 if (phase != old_phase) {
2020 old_phase = phase;
2021 NCR_PRINT_PHASE(NDEBUG_INFORMATION);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002022 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002023
Roman Zippelc28bda22007-05-01 22:32:36 +02002024 if (sink && (phase != PHASE_MSGOUT)) {
2025 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002026
Roman Zippelc28bda22007-05-01 22:32:36 +02002027 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN |
2028 ICR_ASSERT_ACK);
2029 while (NCR5380_read(STATUS_REG) & SR_REQ)
2030 ;
2031 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
2032 ICR_ASSERT_ATN);
2033 sink = 0;
2034 continue;
2035 }
2036
2037 switch (phase) {
2038 case PHASE_DATAOUT:
2039#if (NDEBUG & NDEBUG_NO_DATAOUT)
2040 printk("scsi%d: NDEBUG_NO_DATAOUT set, attempted DATAOUT "
2041 "aborted\n", HOSTNO);
2042 sink = 1;
2043 do_abort(instance);
2044 cmd->result = DID_ERROR << 16;
Matthew Wilcoxcce99c62007-09-25 12:42:01 -04002045 cmd->scsi_done(cmd);
Roman Zippelc28bda22007-05-01 22:32:36 +02002046 return;
2047#endif
2048 case PHASE_DATAIN:
2049 /*
2050 * If there is no room left in the current buffer in the
2051 * scatter-gather list, move onto the next one.
2052 */
2053
2054 if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
2055 ++cmd->SCp.buffer;
2056 --cmd->SCp.buffers_residual;
2057 cmd->SCp.this_residual = cmd->SCp.buffer->length;
Jens Axboe45711f12007-10-22 21:19:53 +02002058 cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
Roman Zippelc28bda22007-05-01 22:32:36 +02002059 /* ++roman: Try to merge some scatter-buffers if
2060 * they are at contiguous physical addresses.
2061 */
2062 merge_contiguous_buffers(cmd);
2063 INF_PRINTK("scsi%d: %d bytes and %d buffers left\n",
2064 HOSTNO, cmd->SCp.this_residual,
2065 cmd->SCp.buffers_residual);
2066 }
2067
2068 /*
2069 * The preferred transfer method is going to be
2070 * PSEUDO-DMA for systems that are strictly PIO,
2071 * since we can let the hardware do the handshaking.
2072 *
2073 * For this to work, we need to know the transfersize
2074 * ahead of time, since the pseudo-DMA code will sit
2075 * in an unconditional loop.
2076 */
2077
2078 /* ++roman: I suggest, this should be
2079 * #if def(REAL_DMA)
2080 * instead of leaving REAL_DMA out.
2081 */
2082
2083#if defined(REAL_DMA)
2084 if (!cmd->device->borken &&
2085 (transfersize = NCR5380_dma_xfer_len(instance,cmd,phase)) > 31) {
2086 len = transfersize;
2087 cmd->SCp.phase = phase;
2088 if (NCR5380_transfer_dma(instance, &phase,
2089 &len, (unsigned char **)&cmd->SCp.ptr)) {
2090 /*
2091 * If the watchdog timer fires, all future
2092 * accesses to this device will use the
2093 * polled-IO. */
2094 printk(KERN_NOTICE "scsi%d: switching target %d "
2095 "lun %d to slow handshake\n", HOSTNO,
2096 cmd->device->id, cmd->device->lun);
2097 cmd->device->borken = 1;
2098 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
2099 ICR_ASSERT_ATN);
2100 sink = 1;
2101 do_abort(instance);
2102 cmd->result = DID_ERROR << 16;
Matthew Wilcoxcce99c62007-09-25 12:42:01 -04002103 cmd->scsi_done(cmd);
Roman Zippelc28bda22007-05-01 22:32:36 +02002104 /* XXX - need to source or sink data here, as appropriate */
2105 } else {
2106#ifdef REAL_DMA
2107 /* ++roman: When using real DMA,
2108 * information_transfer() should return after
2109 * starting DMA since it has nothing more to
2110 * do.
2111 */
2112 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002113#else
Roman Zippelc28bda22007-05-01 22:32:36 +02002114 cmd->SCp.this_residual -= transfersize - len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002115#endif
Roman Zippelc28bda22007-05-01 22:32:36 +02002116 }
2117 } else
2118#endif /* defined(REAL_DMA) */
2119 NCR5380_transfer_pio(instance, &phase,
2120 (int *)&cmd->SCp.this_residual,
2121 (unsigned char **)&cmd->SCp.ptr);
2122 break;
2123 case PHASE_MSGIN:
2124 len = 1;
2125 data = &tmp;
2126 NCR5380_write(SELECT_ENABLE_REG, 0); /* disable reselects */
2127 NCR5380_transfer_pio(instance, &phase, &len, &data);
2128 cmd->SCp.Message = tmp;
2129
2130 switch (tmp) {
2131 /*
2132 * Linking lets us reduce the time required to get the
2133 * next command out to the device, hopefully this will
2134 * mean we don't waste another revolution due to the delays
2135 * required by ARBITRATION and another SELECTION.
2136 *
2137 * In the current implementation proposal, low level drivers
2138 * merely have to start the next command, pointed to by
2139 * next_link, done() is called as with unlinked commands.
2140 */
2141#ifdef LINKED
2142 case LINKED_CMD_COMPLETE:
2143 case LINKED_FLG_CMD_COMPLETE:
2144 /* Accept message by clearing ACK */
2145 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2146
2147 LNK_PRINTK("scsi%d: target %d lun %d linked command "
2148 "complete.\n", HOSTNO, cmd->device->id, cmd->device->lun);
2149
2150 /* Enable reselect interrupts */
2151 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2152 /*
2153 * Sanity check : A linked command should only terminate
2154 * with one of these messages if there are more linked
2155 * commands available.
2156 */
2157
2158 if (!cmd->next_link) {
2159 printk(KERN_NOTICE "scsi%d: target %d lun %d "
2160 "linked command complete, no next_link\n",
2161 HOSTNO, cmd->device->id, cmd->device->lun);
2162 sink = 1;
2163 do_abort(instance);
2164 return;
2165 }
2166
2167 initialize_SCp(cmd->next_link);
2168 /* The next command is still part of this process; copy it
2169 * and don't free it! */
2170 cmd->next_link->tag = cmd->tag;
2171 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
2172 LNK_PRINTK("scsi%d: target %d lun %d linked request "
2173 "done, calling scsi_done().\n",
2174 HOSTNO, cmd->device->id, cmd->device->lun);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002175#ifdef NCR5380_STATS
Roman Zippelc28bda22007-05-01 22:32:36 +02002176 collect_stats(hostdata, cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002177#endif
Roman Zippelc28bda22007-05-01 22:32:36 +02002178 cmd->scsi_done(cmd);
2179 cmd = hostdata->connected;
2180 break;
2181#endif /* def LINKED */
2182 case ABORT:
2183 case COMMAND_COMPLETE:
2184 /* Accept message by clearing ACK */
2185 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2186 /* ++guenther: possible race with Falcon locking */
2187 falcon_dont_release++;
2188 hostdata->connected = NULL;
2189 QU_PRINTK("scsi%d: command for target %d, lun %d "
2190 "completed\n", HOSTNO, cmd->device->id, cmd->device->lun);
2191#ifdef SUPPORT_TAGS
2192 cmd_free_tag(cmd);
2193 if (status_byte(cmd->SCp.Status) == QUEUE_FULL) {
2194 /* Turn a QUEUE FULL status into BUSY, I think the
2195 * mid level cannot handle QUEUE FULL :-( (The
2196 * command is retried after BUSY). Also update our
2197 * queue size to the number of currently issued
2198 * commands now.
2199 */
2200 /* ++Andreas: the mid level code knows about
2201 QUEUE_FULL now. */
2202 TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun];
2203 TAG_PRINTK("scsi%d: target %d lun %d returned "
2204 "QUEUE_FULL after %d commands\n",
2205 HOSTNO, cmd->device->id, cmd->device->lun,
2206 ta->nr_allocated);
2207 if (ta->queue_size > ta->nr_allocated)
2208 ta->nr_allocated = ta->queue_size;
2209 }
2210#else
2211 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2212#endif
2213 /* Enable reselect interrupts */
2214 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2215
2216 /*
2217 * I'm not sure what the correct thing to do here is :
2218 *
2219 * If the command that just executed is NOT a request
2220 * sense, the obvious thing to do is to set the result
2221 * code to the values of the stored parameters.
2222 *
2223 * If it was a REQUEST SENSE command, we need some way to
2224 * differentiate between the failure code of the original
2225 * and the failure code of the REQUEST sense - the obvious
2226 * case is success, where we fall through and leave the
2227 * result code unchanged.
2228 *
2229 * The non-obvious place is where the REQUEST SENSE failed
2230 */
2231
2232 if (cmd->cmnd[0] != REQUEST_SENSE)
2233 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
2234 else if (status_byte(cmd->SCp.Status) != GOOD)
2235 cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16);
2236
2237#ifdef AUTOSENSE
Boaz Harrosh28424d32007-09-10 22:37:45 +03002238 if ((cmd->cmnd[0] == REQUEST_SENSE) &&
2239 hostdata->ses.cmd_len) {
2240 scsi_eh_restore_cmnd(cmd, &hostdata->ses);
2241 hostdata->ses.cmd_len = 0 ;
2242 }
2243
Roman Zippelc28bda22007-05-01 22:32:36 +02002244 if ((cmd->cmnd[0] != REQUEST_SENSE) &&
2245 (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) {
Boaz Harrosh28424d32007-09-10 22:37:45 +03002246 scsi_eh_prep_cmnd(cmd, &hostdata->ses, NULL, 0, ~0);
Roman Zippelc28bda22007-05-01 22:32:36 +02002247
Boaz Harrosh28424d32007-09-10 22:37:45 +03002248 ASEN_PRINTK("scsi%d: performing request sense\n", HOSTNO);
Roman Zippelc28bda22007-05-01 22:32:36 +02002249
2250 local_irq_save(flags);
2251 LIST(cmd,hostdata->issue_queue);
Roman Zippel3130d902007-05-01 22:32:37 +02002252 SET_NEXT(cmd, hostdata->issue_queue);
Roman Zippelc28bda22007-05-01 22:32:36 +02002253 hostdata->issue_queue = (Scsi_Cmnd *) cmd;
2254 local_irq_restore(flags);
2255 QU_PRINTK("scsi%d: REQUEST SENSE added to head of "
2256 "issue queue\n", H_NO(cmd));
2257 } else
2258#endif /* def AUTOSENSE */
2259 {
2260#ifdef NCR5380_STATS
2261 collect_stats(hostdata, cmd);
2262#endif
2263 cmd->scsi_done(cmd);
2264 }
2265
2266 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2267 /*
2268 * Restore phase bits to 0 so an interrupted selection,
2269 * arbitration can resume.
2270 */
2271 NCR5380_write(TARGET_COMMAND_REG, 0);
2272
2273 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
2274 barrier();
2275
2276 falcon_dont_release--;
2277 /* ++roman: For Falcon SCSI, release the lock on the
2278 * ST-DMA here if no other commands are waiting on the
2279 * disconnected queue.
2280 */
2281 falcon_release_lock_if_possible(hostdata);
2282 return;
2283 case MESSAGE_REJECT:
2284 /* Accept message by clearing ACK */
2285 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2286 /* Enable reselect interrupts */
2287 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2288 switch (hostdata->last_message) {
2289 case HEAD_OF_QUEUE_TAG:
2290 case ORDERED_QUEUE_TAG:
2291 case SIMPLE_QUEUE_TAG:
2292 /* The target obviously doesn't support tagged
2293 * queuing, even though it announced this ability in
2294 * its INQUIRY data ?!? (maybe only this LUN?) Ok,
2295 * clear 'tagged_supported' and lock the LUN, since
2296 * the command is treated as untagged further on.
2297 */
2298 cmd->device->tagged_supported = 0;
2299 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
2300 cmd->tag = TAG_NONE;
2301 TAG_PRINTK("scsi%d: target %d lun %d rejected "
2302 "QUEUE_TAG message; tagged queuing "
2303 "disabled\n",
2304 HOSTNO, cmd->device->id, cmd->device->lun);
2305 break;
2306 }
2307 break;
2308 case DISCONNECT:
2309 /* Accept message by clearing ACK */
2310 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2311 local_irq_save(flags);
2312 cmd->device->disconnect = 1;
2313 LIST(cmd,hostdata->disconnected_queue);
Roman Zippel3130d902007-05-01 22:32:37 +02002314 SET_NEXT(cmd, hostdata->disconnected_queue);
Roman Zippelc28bda22007-05-01 22:32:36 +02002315 hostdata->connected = NULL;
2316 hostdata->disconnected_queue = cmd;
2317 local_irq_restore(flags);
2318 QU_PRINTK("scsi%d: command for target %d lun %d was "
2319 "moved from connected to the "
2320 "disconnected_queue\n", HOSTNO,
2321 cmd->device->id, cmd->device->lun);
2322 /*
2323 * Restore phase bits to 0 so an interrupted selection,
2324 * arbitration can resume.
2325 */
2326 NCR5380_write(TARGET_COMMAND_REG, 0);
2327
2328 /* Enable reselect interrupts */
2329 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2330 /* Wait for bus free to avoid nasty timeouts */
2331 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
2332 barrier();
2333 return;
2334 /*
2335 * The SCSI data pointer is *IMPLICITLY* saved on a disconnect
2336 * operation, in violation of the SCSI spec so we can safely
2337 * ignore SAVE/RESTORE pointers calls.
2338 *
2339 * Unfortunately, some disks violate the SCSI spec and
2340 * don't issue the required SAVE_POINTERS message before
2341 * disconnecting, and we have to break spec to remain
2342 * compatible.
2343 */
2344 case SAVE_POINTERS:
2345 case RESTORE_POINTERS:
2346 /* Accept message by clearing ACK */
2347 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2348 /* Enable reselect interrupts */
2349 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2350 break;
2351 case EXTENDED_MESSAGE:
2352 /*
2353 * Extended messages are sent in the following format :
2354 * Byte
2355 * 0 EXTENDED_MESSAGE == 1
2356 * 1 length (includes one byte for code, doesn't
2357 * include first two bytes)
2358 * 2 code
2359 * 3..length+1 arguments
2360 *
2361 * Start the extended message buffer with the EXTENDED_MESSAGE
2362 * byte, since spi_print_msg() wants the whole thing.
2363 */
2364 extended_msg[0] = EXTENDED_MESSAGE;
2365 /* Accept first byte by clearing ACK */
2366 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2367
2368 EXT_PRINTK("scsi%d: receiving extended message\n", HOSTNO);
2369
2370 len = 2;
2371 data = extended_msg + 1;
2372 phase = PHASE_MSGIN;
2373 NCR5380_transfer_pio(instance, &phase, &len, &data);
2374 EXT_PRINTK("scsi%d: length=%d, code=0x%02x\n", HOSTNO,
2375 (int)extended_msg[1], (int)extended_msg[2]);
2376
2377 if (!len && extended_msg[1] <=
2378 (sizeof(extended_msg) - 1)) {
2379 /* Accept third byte by clearing ACK */
2380 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2381 len = extended_msg[1] - 1;
2382 data = extended_msg + 3;
2383 phase = PHASE_MSGIN;
2384
2385 NCR5380_transfer_pio(instance, &phase, &len, &data);
2386 EXT_PRINTK("scsi%d: message received, residual %d\n",
2387 HOSTNO, len);
2388
2389 switch (extended_msg[2]) {
2390 case EXTENDED_SDTR:
2391 case EXTENDED_WDTR:
2392 case EXTENDED_MODIFY_DATA_POINTER:
2393 case EXTENDED_EXTENDED_IDENTIFY:
2394 tmp = 0;
2395 }
2396 } else if (len) {
2397 printk(KERN_NOTICE "scsi%d: error receiving "
2398 "extended message\n", HOSTNO);
2399 tmp = 0;
2400 } else {
2401 printk(KERN_NOTICE "scsi%d: extended message "
2402 "code %02x length %d is too long\n",
2403 HOSTNO, extended_msg[2], extended_msg[1]);
2404 tmp = 0;
2405 }
2406 /* Fall through to reject message */
2407
2408 /*
2409 * If we get something weird that we aren't expecting,
2410 * reject it.
2411 */
2412 default:
2413 if (!tmp) {
2414 printk(KERN_DEBUG "scsi%d: rejecting message ", HOSTNO);
2415 spi_print_msg(extended_msg);
2416 printk("\n");
2417 } else if (tmp != EXTENDED_MESSAGE)
2418 printk(KERN_DEBUG "scsi%d: rejecting unknown "
2419 "message %02x from target %d, lun %d\n",
2420 HOSTNO, tmp, cmd->device->id, cmd->device->lun);
2421 else
2422 printk(KERN_DEBUG "scsi%d: rejecting unknown "
2423 "extended message "
2424 "code %02x, length %d from target %d, lun %d\n",
2425 HOSTNO, extended_msg[1], extended_msg[0],
2426 cmd->device->id, cmd->device->lun);
2427
2428
2429 msgout = MESSAGE_REJECT;
2430 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
2431 break;
2432 } /* switch (tmp) */
2433 break;
2434 case PHASE_MSGOUT:
2435 len = 1;
2436 data = &msgout;
2437 hostdata->last_message = msgout;
2438 NCR5380_transfer_pio(instance, &phase, &len, &data);
2439 if (msgout == ABORT) {
2440#ifdef SUPPORT_TAGS
2441 cmd_free_tag(cmd);
2442#else
2443 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2444#endif
2445 hostdata->connected = NULL;
2446 cmd->result = DID_ERROR << 16;
2447#ifdef NCR5380_STATS
2448 collect_stats(hostdata, cmd);
2449#endif
2450 cmd->scsi_done(cmd);
2451 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2452 falcon_release_lock_if_possible(hostdata);
2453 return;
2454 }
2455 msgout = NOP;
2456 break;
2457 case PHASE_CMDOUT:
2458 len = cmd->cmd_len;
2459 data = cmd->cmnd;
2460 /*
2461 * XXX for performance reasons, on machines with a
2462 * PSEUDO-DMA architecture we should probably
2463 * use the dma transfer function.
2464 */
2465 NCR5380_transfer_pio(instance, &phase, &len, &data);
2466 break;
2467 case PHASE_STATIN:
2468 len = 1;
2469 data = &tmp;
2470 NCR5380_transfer_pio(instance, &phase, &len, &data);
2471 cmd->SCp.Status = tmp;
2472 break;
2473 default:
2474 printk("scsi%d: unknown phase\n", HOSTNO);
2475 NCR_PRINT(NDEBUG_ANY);
2476 } /* switch(phase) */
2477 } /* if (tmp * SR_REQ) */
2478 } /* while (1) */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002479}
2480
2481/*
2482 * Function : void NCR5380_reselect (struct Scsi_Host *instance)
2483 *
Roman Zippelc28bda22007-05-01 22:32:36 +02002484 * Purpose : does reselection, initializing the instance->connected
2485 * field to point to the Scsi_Cmnd for which the I_T_L or I_T_L_Q
Linus Torvalds1da177e2005-04-16 15:20:36 -07002486 * nexus has been reestablished,
Roman Zippelc28bda22007-05-01 22:32:36 +02002487 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002488 * Inputs : instance - this instance of the NCR5380.
2489 *
2490 */
2491
2492
Roman Zippelc28bda22007-05-01 22:32:36 +02002493static void NCR5380_reselect(struct Scsi_Host *instance)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002494{
Roman Zippelc28bda22007-05-01 22:32:36 +02002495 SETUP_HOSTDATA(instance);
2496 unsigned char target_mask;
2497 unsigned char lun, phase;
2498 int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002499#ifdef SUPPORT_TAGS
Roman Zippelc28bda22007-05-01 22:32:36 +02002500 unsigned char tag;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002501#endif
Roman Zippelc28bda22007-05-01 22:32:36 +02002502 unsigned char msg[3];
2503 unsigned char *data;
2504 Scsi_Cmnd *tmp = NULL, *prev;
2505/* unsigned long flags; */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002506
Roman Zippelc28bda22007-05-01 22:32:36 +02002507 /*
2508 * Disable arbitration, etc. since the host adapter obviously
2509 * lost, and tell an interrupted NCR5380_select() to restart.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002510 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002511
Roman Zippelc28bda22007-05-01 22:32:36 +02002512 NCR5380_write(MODE_REG, MR_BASE);
2513 hostdata->restart_select = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002514
Roman Zippelc28bda22007-05-01 22:32:36 +02002515 target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask);
2516
2517 RSL_PRINTK("scsi%d: reselect\n", HOSTNO);
2518
2519 /*
2520 * At this point, we have detected that our SCSI ID is on the bus,
2521 * SEL is true and BSY was false for at least one bus settle delay
2522 * (400 ns).
2523 *
2524 * We must assert BSY ourselves, until the target drops the SEL
2525 * signal.
2526 */
2527
2528 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY);
2529
2530 while (NCR5380_read(STATUS_REG) & SR_SEL)
2531 ;
2532 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2533
2534 /*
2535 * Wait for target to go into MSGIN.
2536 */
2537
2538 while (!(NCR5380_read(STATUS_REG) & SR_REQ))
2539 ;
2540
2541 len = 1;
2542 data = msg;
2543 phase = PHASE_MSGIN;
2544 NCR5380_transfer_pio(instance, &phase, &len, &data);
2545
2546 if (!(msg[0] & 0x80)) {
2547 printk(KERN_DEBUG "scsi%d: expecting IDENTIFY message, got ", HOSTNO);
2548 spi_print_msg(msg);
2549 do_abort(instance);
2550 return;
2551 }
2552 lun = (msg[0] & 0x07);
2553
2554#ifdef SUPPORT_TAGS
2555 /* If the phase is still MSGIN, the target wants to send some more
2556 * messages. In case it supports tagged queuing, this is probably a
2557 * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus.
2558 */
2559 tag = TAG_NONE;
2560 if (phase == PHASE_MSGIN && setup_use_tagged_queuing) {
2561 /* Accept previous IDENTIFY message by clearing ACK */
2562 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2563 len = 2;
2564 data = msg + 1;
2565 if (!NCR5380_transfer_pio(instance, &phase, &len, &data) &&
2566 msg[1] == SIMPLE_QUEUE_TAG)
2567 tag = msg[2];
2568 TAG_PRINTK("scsi%d: target mask %02x, lun %d sent tag %d at "
2569 "reselection\n", HOSTNO, target_mask, lun, tag);
2570 }
2571#endif
2572
2573 /*
2574 * Find the command corresponding to the I_T_L or I_T_L_Q nexus we
2575 * just reestablished, and remove it from the disconnected queue.
2576 */
2577
2578 for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue, prev = NULL;
2579 tmp; prev = tmp, tmp = NEXT(tmp)) {
2580 if ((target_mask == (1 << tmp->device->id)) && (lun == tmp->device->lun)
2581#ifdef SUPPORT_TAGS
2582 && (tag == tmp->tag)
2583#endif
2584 ) {
2585 /* ++guenther: prevent race with falcon_release_lock */
2586 falcon_dont_release++;
2587 if (prev) {
2588 REMOVE(prev, NEXT(prev), tmp, NEXT(tmp));
Roman Zippel3130d902007-05-01 22:32:37 +02002589 SET_NEXT(prev, NEXT(tmp));
Roman Zippelc28bda22007-05-01 22:32:36 +02002590 } else {
2591 REMOVE(-1, hostdata->disconnected_queue, tmp, NEXT(tmp));
2592 hostdata->disconnected_queue = NEXT(tmp);
2593 }
Roman Zippel3130d902007-05-01 22:32:37 +02002594 SET_NEXT(tmp, NULL);
Roman Zippelc28bda22007-05-01 22:32:36 +02002595 break;
2596 }
2597 }
2598
2599 if (!tmp) {
2600 printk(KERN_WARNING "scsi%d: warning: target bitmask %02x lun %d "
2601#ifdef SUPPORT_TAGS
2602 "tag %d "
2603#endif
2604 "not in disconnected_queue.\n",
2605 HOSTNO, target_mask, lun
2606#ifdef SUPPORT_TAGS
2607 , tag
2608#endif
2609 );
2610 /*
2611 * Since we have an established nexus that we can't do anything
2612 * with, we must abort it.
2613 */
2614 do_abort(instance);
2615 return;
2616 }
2617
2618 /* Accept message by clearing ACK */
2619 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2620
2621 hostdata->connected = tmp;
2622 RSL_PRINTK("scsi%d: nexus established, target = %d, lun = %d, tag = %d\n",
2623 HOSTNO, tmp->device->id, tmp->device->lun, tmp->tag);
2624 falcon_dont_release--;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002625}
2626
2627
2628/*
2629 * Function : int NCR5380_abort (Scsi_Cmnd *cmd)
2630 *
2631 * Purpose : abort a command
2632 *
Roman Zippelc28bda22007-05-01 22:32:36 +02002633 * Inputs : cmd - the Scsi_Cmnd to abort, code - code to set the
2634 * host byte of the result field to, if zero DID_ABORTED is
Linus Torvalds1da177e2005-04-16 15:20:36 -07002635 * used.
2636 *
2637 * Returns : 0 - success, -1 on failure.
2638 *
Roman Zippelc28bda22007-05-01 22:32:36 +02002639 * XXX - there is no way to abort the command that is currently
2640 * connected, you have to wait for it to complete. If this is
Linus Torvalds1da177e2005-04-16 15:20:36 -07002641 * a problem, we could implement longjmp() / setjmp(), setjmp()
Roman Zippelc28bda22007-05-01 22:32:36 +02002642 * called where the loop started in NCR5380_main().
Linus Torvalds1da177e2005-04-16 15:20:36 -07002643 */
2644
2645static
Roman Zippelc28bda22007-05-01 22:32:36 +02002646int NCR5380_abort(Scsi_Cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002647{
Roman Zippelc28bda22007-05-01 22:32:36 +02002648 struct Scsi_Host *instance = cmd->device->host;
2649 SETUP_HOSTDATA(instance);
2650 Scsi_Cmnd *tmp, **prev;
2651 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002652
Roman Zippelc28bda22007-05-01 22:32:36 +02002653 printk(KERN_NOTICE "scsi%d: aborting command\n", HOSTNO);
2654 scsi_print_command(cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002655
Roman Zippelc28bda22007-05-01 22:32:36 +02002656 NCR5380_print_status(instance);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002657
Roman Zippelc28bda22007-05-01 22:32:36 +02002658 local_irq_save(flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002659
Roman Zippelc28bda22007-05-01 22:32:36 +02002660 if (!IS_A_TT() && !falcon_got_lock)
2661 printk(KERN_ERR "scsi%d: !!BINGO!! Falcon has no lock in NCR5380_abort\n",
2662 HOSTNO);
2663
2664 ABRT_PRINTK("scsi%d: abort called basr 0x%02x, sr 0x%02x\n", HOSTNO,
2665 NCR5380_read(BUS_AND_STATUS_REG),
2666 NCR5380_read(STATUS_REG));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002667
2668#if 1
Roman Zippelc28bda22007-05-01 22:32:36 +02002669 /*
2670 * Case 1 : If the command is the currently executing command,
2671 * we'll set the aborted flag and return control so that
2672 * information transfer routine can exit cleanly.
2673 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002674
Roman Zippelc28bda22007-05-01 22:32:36 +02002675 if (hostdata->connected == cmd) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002676
Roman Zippelc28bda22007-05-01 22:32:36 +02002677 ABRT_PRINTK("scsi%d: aborting connected command\n", HOSTNO);
2678 /*
2679 * We should perform BSY checking, and make sure we haven't slipped
2680 * into BUS FREE.
2681 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002682
Roman Zippelc28bda22007-05-01 22:32:36 +02002683 /* NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN); */
2684 /*
2685 * Since we can't change phases until we've completed the current
2686 * handshake, we have to source or sink a byte of data if the current
2687 * phase is not MSGOUT.
2688 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002689
Roman Zippelc28bda22007-05-01 22:32:36 +02002690 /*
2691 * Return control to the executing NCR drive so we can clear the
2692 * aborted flag and get back into our main loop.
2693 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002694
Roman Zippelc28bda22007-05-01 22:32:36 +02002695 if (do_abort(instance) == 0) {
2696 hostdata->aborted = 1;
2697 hostdata->connected = NULL;
2698 cmd->result = DID_ABORT << 16;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002699#ifdef SUPPORT_TAGS
Roman Zippelc28bda22007-05-01 22:32:36 +02002700 cmd_free_tag(cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002701#else
Roman Zippelc28bda22007-05-01 22:32:36 +02002702 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002703#endif
Roman Zippelc28bda22007-05-01 22:32:36 +02002704 local_irq_restore(flags);
2705 cmd->scsi_done(cmd);
2706 falcon_release_lock_if_possible(hostdata);
2707 return SCSI_ABORT_SUCCESS;
2708 } else {
2709/* local_irq_restore(flags); */
2710 printk("scsi%d: abort of connected command failed!\n", HOSTNO);
2711 return SCSI_ABORT_ERROR;
2712 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002713 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002714#endif
Roman Zippelc28bda22007-05-01 22:32:36 +02002715
2716 /*
2717 * Case 2 : If the command hasn't been issued yet, we simply remove it
2718 * from the issue queue.
2719 */
2720 for (prev = (Scsi_Cmnd **)&(hostdata->issue_queue),
2721 tmp = (Scsi_Cmnd *)hostdata->issue_queue;
2722 tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp)) {
2723 if (cmd == tmp) {
2724 REMOVE(5, *prev, tmp, NEXT(tmp));
2725 (*prev) = NEXT(tmp);
Roman Zippel3130d902007-05-01 22:32:37 +02002726 SET_NEXT(tmp, NULL);
Roman Zippelc28bda22007-05-01 22:32:36 +02002727 tmp->result = DID_ABORT << 16;
2728 local_irq_restore(flags);
2729 ABRT_PRINTK("scsi%d: abort removed command from issue queue.\n",
2730 HOSTNO);
2731 /* Tagged queuing note: no tag to free here, hasn't been assigned
2732 * yet... */
2733 tmp->scsi_done(tmp);
2734 falcon_release_lock_if_possible(hostdata);
2735 return SCSI_ABORT_SUCCESS;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002736 }
2737 }
2738
Roman Zippelc28bda22007-05-01 22:32:36 +02002739 /*
2740 * Case 3 : If any commands are connected, we're going to fail the abort
2741 * and let the high level SCSI driver retry at a later time or
2742 * issue a reset.
2743 *
2744 * Timeouts, and therefore aborted commands, will be highly unlikely
2745 * and handling them cleanly in this situation would make the common
2746 * case of noresets less efficient, and would pollute our code. So,
2747 * we fail.
2748 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002749
Roman Zippelc28bda22007-05-01 22:32:36 +02002750 if (hostdata->connected) {
2751 local_irq_restore(flags);
2752 ABRT_PRINTK("scsi%d: abort failed, command connected.\n", HOSTNO);
2753 return SCSI_ABORT_SNOOZE;
2754 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002755
Roman Zippelc28bda22007-05-01 22:32:36 +02002756 /*
2757 * Case 4: If the command is currently disconnected from the bus, and
2758 * there are no connected commands, we reconnect the I_T_L or
2759 * I_T_L_Q nexus associated with it, go into message out, and send
2760 * an abort message.
2761 *
2762 * This case is especially ugly. In order to reestablish the nexus, we
2763 * need to call NCR5380_select(). The easiest way to implement this
2764 * function was to abort if the bus was busy, and let the interrupt
2765 * handler triggered on the SEL for reselect take care of lost arbitrations
2766 * where necessary, meaning interrupts need to be enabled.
2767 *
2768 * When interrupts are enabled, the queues may change - so we
2769 * can't remove it from the disconnected queue before selecting it
2770 * because that could cause a failure in hashing the nexus if that
2771 * device reselected.
2772 *
2773 * Since the queues may change, we can't use the pointers from when we
2774 * first locate it.
2775 *
2776 * So, we must first locate the command, and if NCR5380_select()
2777 * succeeds, then issue the abort, relocate the command and remove
2778 * it from the disconnected queue.
2779 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002780
Roman Zippelc28bda22007-05-01 22:32:36 +02002781 for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue; tmp;
2782 tmp = NEXT(tmp)) {
2783 if (cmd == tmp) {
2784 local_irq_restore(flags);
2785 ABRT_PRINTK("scsi%d: aborting disconnected command.\n", HOSTNO);
2786
2787 if (NCR5380_select(instance, cmd, (int)cmd->tag))
2788 return SCSI_ABORT_BUSY;
2789
2790 ABRT_PRINTK("scsi%d: nexus reestablished.\n", HOSTNO);
2791
2792 do_abort(instance);
2793
2794 local_irq_save(flags);
2795 for (prev = (Scsi_Cmnd **)&(hostdata->disconnected_queue),
2796 tmp = (Scsi_Cmnd *)hostdata->disconnected_queue;
2797 tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp)) {
2798 if (cmd == tmp) {
2799 REMOVE(5, *prev, tmp, NEXT(tmp));
2800 *prev = NEXT(tmp);
Roman Zippel3130d902007-05-01 22:32:37 +02002801 SET_NEXT(tmp, NULL);
Roman Zippelc28bda22007-05-01 22:32:36 +02002802 tmp->result = DID_ABORT << 16;
2803 /* We must unlock the tag/LUN immediately here, since the
2804 * target goes to BUS FREE and doesn't send us another
2805 * message (COMMAND_COMPLETE or the like)
2806 */
2807#ifdef SUPPORT_TAGS
2808 cmd_free_tag(tmp);
2809#else
2810 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2811#endif
2812 local_irq_restore(flags);
2813 tmp->scsi_done(tmp);
2814 falcon_release_lock_if_possible(hostdata);
2815 return SCSI_ABORT_SUCCESS;
2816 }
2817 }
2818 }
2819 }
2820
2821 /*
2822 * Case 5 : If we reached this point, the command was not found in any of
2823 * the queues.
2824 *
2825 * We probably reached this point because of an unlikely race condition
2826 * between the command completing successfully and the abortion code,
2827 * so we won't panic, but we will notify the user in case something really
2828 * broke.
2829 */
2830
2831 local_irq_restore(flags);
Joe Perchesad361c92009-07-06 13:05:40 -07002832 printk(KERN_INFO "scsi%d: warning : SCSI command probably completed successfully before abortion\n", HOSTNO);
Roman Zippelc28bda22007-05-01 22:32:36 +02002833
2834 /* Maybe it is sufficient just to release the ST-DMA lock... (if
2835 * possible at all) At least, we should check if the lock could be
2836 * released after the abort, in case it is kept due to some bug.
2837 */
2838 falcon_release_lock_if_possible(hostdata);
2839
2840 return SCSI_ABORT_NOT_RUNNING;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002841}
2842
2843
Roman Zippelc28bda22007-05-01 22:32:36 +02002844/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002845 * Function : int NCR5380_reset (Scsi_Cmnd *cmd)
Roman Zippelc28bda22007-05-01 22:32:36 +02002846 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002847 * Purpose : reset the SCSI bus.
2848 *
2849 * Returns : SCSI_RESET_WAKEUP
2850 *
Roman Zippelc28bda22007-05-01 22:32:36 +02002851 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002852
Roman Zippelc28bda22007-05-01 22:32:36 +02002853static int NCR5380_bus_reset(Scsi_Cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002854{
Roman Zippelc28bda22007-05-01 22:32:36 +02002855 SETUP_HOSTDATA(cmd->device->host);
2856 int i;
2857 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002858#if 1
Roman Zippelc28bda22007-05-01 22:32:36 +02002859 Scsi_Cmnd *connected, *disconnected_queue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002860#endif
2861
Roman Zippelc28bda22007-05-01 22:32:36 +02002862 if (!IS_A_TT() && !falcon_got_lock)
2863 printk(KERN_ERR "scsi%d: !!BINGO!! Falcon has no lock in NCR5380_reset\n",
2864 H_NO(cmd));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002865
Roman Zippelc28bda22007-05-01 22:32:36 +02002866 NCR5380_print_status(cmd->device->host);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002867
Roman Zippelc28bda22007-05-01 22:32:36 +02002868 /* get in phase */
2869 NCR5380_write(TARGET_COMMAND_REG,
2870 PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG)));
2871 /* assert RST */
2872 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST);
2873 udelay(40);
2874 /* reset NCR registers */
2875 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2876 NCR5380_write(MODE_REG, MR_BASE);
2877 NCR5380_write(TARGET_COMMAND_REG, 0);
2878 NCR5380_write(SELECT_ENABLE_REG, 0);
2879 /* ++roman: reset interrupt condition! otherwise no interrupts don't get
2880 * through anymore ... */
2881 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002882
Roman Zippelc28bda22007-05-01 22:32:36 +02002883#if 1 /* XXX Should now be done by midlevel code, but it's broken XXX */
2884 /* XXX see below XXX */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002885
Roman Zippelc28bda22007-05-01 22:32:36 +02002886 /* MSch: old-style reset: actually abort all command processing here */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002887
Roman Zippelc28bda22007-05-01 22:32:36 +02002888 /* After the reset, there are no more connected or disconnected commands
2889 * and no busy units; to avoid problems with re-inserting the commands
2890 * into the issue_queue (via scsi_done()), the aborted commands are
2891 * remembered in local variables first.
2892 */
2893 local_irq_save(flags);
2894 connected = (Scsi_Cmnd *)hostdata->connected;
2895 hostdata->connected = NULL;
2896 disconnected_queue = (Scsi_Cmnd *)hostdata->disconnected_queue;
2897 hostdata->disconnected_queue = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002898#ifdef SUPPORT_TAGS
Roman Zippelc28bda22007-05-01 22:32:36 +02002899 free_all_tags();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002900#endif
Roman Zippelc28bda22007-05-01 22:32:36 +02002901 for (i = 0; i < 8; ++i)
2902 hostdata->busy[i] = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002903#ifdef REAL_DMA
Roman Zippelc28bda22007-05-01 22:32:36 +02002904 hostdata->dma_len = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002905#endif
Roman Zippelc28bda22007-05-01 22:32:36 +02002906 local_irq_restore(flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002907
Roman Zippelc28bda22007-05-01 22:32:36 +02002908 /* In order to tell the mid-level code which commands were aborted,
2909 * set the command status to DID_RESET and call scsi_done() !!!
2910 * This ultimately aborts processing of these commands in the mid-level.
2911 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002912
Roman Zippelc28bda22007-05-01 22:32:36 +02002913 if ((cmd = connected)) {
2914 ABRT_PRINTK("scsi%d: reset aborted a connected command\n", H_NO(cmd));
2915 cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16);
2916 cmd->scsi_done(cmd);
2917 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002918
Roman Zippelc28bda22007-05-01 22:32:36 +02002919 for (i = 0; (cmd = disconnected_queue); ++i) {
2920 disconnected_queue = NEXT(cmd);
Roman Zippel3130d902007-05-01 22:32:37 +02002921 SET_NEXT(cmd, NULL);
Roman Zippelc28bda22007-05-01 22:32:36 +02002922 cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16);
2923 cmd->scsi_done(cmd);
2924 }
2925 if (i > 0)
2926 ABRT_PRINTK("scsi: reset aborted %d disconnected command(s)\n", i);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002927
Roman Zippelc28bda22007-05-01 22:32:36 +02002928 /* The Falcon lock should be released after a reset...
2929 */
2930 /* ++guenther: moved to atari_scsi_reset(), to prevent a race between
2931 * unlocking and enabling dma interrupt.
2932 */
2933/* falcon_release_lock_if_possible( hostdata );*/
Linus Torvalds1da177e2005-04-16 15:20:36 -07002934
Roman Zippelc28bda22007-05-01 22:32:36 +02002935 /* since all commands have been explicitly terminated, we need to tell
2936 * the midlevel code that the reset was SUCCESSFUL, and there is no
2937 * need to 'wake up' the commands by a request_sense
2938 */
2939 return SCSI_RESET_SUCCESS | SCSI_RESET_BUS_RESET;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002940#else /* 1 */
2941
Roman Zippelc28bda22007-05-01 22:32:36 +02002942 /* MSch: new-style reset handling: let the mid-level do what it can */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002943
Roman Zippelc28bda22007-05-01 22:32:36 +02002944 /* ++guenther: MID-LEVEL IS STILL BROKEN.
2945 * Mid-level is supposed to requeue all commands that were active on the
2946 * various low-level queues. In fact it does this, but that's not enough
2947 * because all these commands are subject to timeout. And if a timeout
2948 * happens for any removed command, *_abort() is called but all queues
2949 * are now empty. Abort then gives up the falcon lock, which is fatal,
2950 * since the mid-level will queue more commands and must have the lock
2951 * (it's all happening inside timer interrupt handler!!).
2952 * Even worse, abort will return NOT_RUNNING for all those commands not
2953 * on any queue, so they won't be retried ...
2954 *
2955 * Conclusion: either scsi.c disables timeout for all resetted commands
2956 * immediately, or we lose! As of linux-2.0.20 it doesn't.
2957 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002958
Roman Zippelc28bda22007-05-01 22:32:36 +02002959 /* After the reset, there are no more connected or disconnected commands
2960 * and no busy units; so clear the low-level status here to avoid
2961 * conflicts when the mid-level code tries to wake up the affected
2962 * commands!
2963 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002964
Roman Zippelc28bda22007-05-01 22:32:36 +02002965 if (hostdata->issue_queue)
2966 ABRT_PRINTK("scsi%d: reset aborted issued command(s)\n", H_NO(cmd));
2967 if (hostdata->connected)
2968 ABRT_PRINTK("scsi%d: reset aborted a connected command\n", H_NO(cmd));
2969 if (hostdata->disconnected_queue)
2970 ABRT_PRINTK("scsi%d: reset aborted disconnected command(s)\n", H_NO(cmd));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002971
Roman Zippelc28bda22007-05-01 22:32:36 +02002972 local_irq_save(flags);
2973 hostdata->issue_queue = NULL;
2974 hostdata->connected = NULL;
2975 hostdata->disconnected_queue = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002976#ifdef SUPPORT_TAGS
Roman Zippelc28bda22007-05-01 22:32:36 +02002977 free_all_tags();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002978#endif
Roman Zippelc28bda22007-05-01 22:32:36 +02002979 for (i = 0; i < 8; ++i)
2980 hostdata->busy[i] = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002981#ifdef REAL_DMA
Roman Zippelc28bda22007-05-01 22:32:36 +02002982 hostdata->dma_len = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002983#endif
Roman Zippelc28bda22007-05-01 22:32:36 +02002984 local_irq_restore(flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002985
Roman Zippelc28bda22007-05-01 22:32:36 +02002986 /* we did no complete reset of all commands, so a wakeup is required */
2987 return SCSI_RESET_WAKEUP | SCSI_RESET_BUS_RESET;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002988#endif /* 1 */
2989}