blob: 1814aa20b7243f0f50f72b065e91b8a2172d9a94 [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) {
Finn Thaind65e6342014-03-18 11:42:20 +1100373 dprintk(NDEBUG_TAGS, "scsi%d: target %d lun %d: no free tags\n",
Roman Zippelc28bda22007-05-01 22:32:36 +0200374 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);
Finn Thaind65e6342014-03-18 11:42:20 +1100397 dprintk(NDEBUG_TAGS, "scsi%d: target %d lun %d now allocated by untagged "
Roman Zippelc28bda22007-05-01 22:32:36 +0200398 "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++;
Finn Thaind65e6342014-03-18 11:42:20 +1100405 dprintk(NDEBUG_TAGS, "scsi%d: using tag %d for target %d lun %d "
Roman Zippelc28bda22007-05-01 22:32:36 +0200406 "(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);
Finn Thaind65e6342014-03-18 11:42:20 +1100423 dprintk(NDEBUG_TAGS, "scsi%d: target %d lun %d untagged cmd finished\n",
Roman Zippelc28bda22007-05-01 22:32:36 +0200424 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--;
Finn Thaind65e6342014-03-18 11:42:20 +1100432 dprintk(NDEBUG_TAGS, "scsi%d: freed tag %d for target %d lun %d\n",
Roman Zippelc28bda22007-05-01 22:32:36 +0200433 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;) {
Finn Thaind65e6342014-03-18 11:42:20 +1100481 dprintk(NDEBUG_MERGING, "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)
Finn Thaind65e6342014-03-18 11:42:20 +1100493 dprintk(NDEBUG_MERGING, "merged %d buffers from %p, new length %08x\n",
Roman Zippelc28bda22007-05-01 22:32:36 +0200494 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629#endif
630
631/*
632 * ++roman: New scheme of calling NCR5380_main()
Roman Zippelc28bda22007-05-01 22:32:36 +0200633 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634 * If we're not in an interrupt, we can call our main directly, it cannot be
635 * already running. Else, we queue it on a task queue, if not 'main_running'
636 * tells us that a lower level is already executing it. This way,
637 * 'main_running' needs not be protected in a special way.
638 *
639 * queue_main() is a utility function for putting our main onto the task
640 * queue, if main_running is false. It should be called only from a
641 * interrupt or bottom half.
642 */
643
Tejun Heo5a0e3ad2010-03-24 17:04:11 +0900644#include <linux/gfp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645#include <linux/workqueue.h>
646#include <linux/interrupt.h>
647
Roman Zippelc28bda22007-05-01 22:32:36 +0200648static volatile int main_running;
Geert Uytterhoevenb312b382007-05-01 22:32:48 +0200649static DECLARE_WORK(NCR5380_tqueue, NCR5380_main);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650
Roman Zippelc28bda22007-05-01 22:32:36 +0200651static inline void queue_main(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652{
Roman Zippelc28bda22007-05-01 22:32:36 +0200653 if (!main_running) {
654 /* If in interrupt and NCR5380_main() not already running,
655 queue it on the 'immediate' task queue, to be processed
656 immediately after the current interrupt processing has
657 finished. */
658 schedule_work(&NCR5380_tqueue);
659 }
660 /* else: nothing to do: the running NCR5380_main() will pick up
661 any newly queued command. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662}
663
664
Roman Zippelc28bda22007-05-01 22:32:36 +0200665static inline void NCR5380_all_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666{
Roman Zippelc28bda22007-05-01 22:32:36 +0200667 static int done = 0;
668 if (!done) {
Finn Thaind65e6342014-03-18 11:42:20 +1100669 dprintk(NDEBUG_INIT, "scsi : NCR5380_all_init()\n");
Roman Zippelc28bda22007-05-01 22:32:36 +0200670 done = 1;
671 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672}
673
Roman Zippelc28bda22007-05-01 22:32:36 +0200674
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675/*
676 * Function : void NCR58380_print_options (struct Scsi_Host *instance)
677 *
678 * Purpose : called by probe code indicating the NCR5380 driver
679 * options that were selected.
680 *
681 * Inputs : instance, pointer to this instance. Unused.
682 */
683
Roman Zippelc28bda22007-05-01 22:32:36 +0200684static void __init NCR5380_print_options(struct Scsi_Host *instance)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685{
Roman Zippelc28bda22007-05-01 22:32:36 +0200686 printk(" generic options"
687#ifdef AUTOSENSE
688 " AUTOSENSE"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689#endif
690#ifdef REAL_DMA
Roman Zippelc28bda22007-05-01 22:32:36 +0200691 " REAL DMA"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692#endif
693#ifdef PARITY
Roman Zippelc28bda22007-05-01 22:32:36 +0200694 " PARITY"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695#endif
696#ifdef SUPPORT_TAGS
Roman Zippelc28bda22007-05-01 22:32:36 +0200697 " SCSI-2 TAGGED QUEUING"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698#endif
Roman Zippelc28bda22007-05-01 22:32:36 +0200699 );
700 printk(" generic release=%d", NCR5380_PUBLIC_RELEASE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701}
702
703/*
704 * Function : void NCR5380_print_status (struct Scsi_Host *instance)
705 *
706 * Purpose : print commands in the various queues, called from
707 * NCR5380_abort and NCR5380_debug to aid debugging.
708 *
Roman Zippelc28bda22007-05-01 22:32:36 +0200709 * Inputs : instance, pointer to this instance.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710 */
711
Al Virod89537e2013-03-31 13:24:44 -0400712static void lprint_Scsi_Cmnd(Scsi_Cmnd *cmd)
713{
714 int i, s;
715 unsigned char *command;
716 printk("scsi%d: destination target %d, lun %d\n",
717 H_NO(cmd), cmd->device->id, cmd->device->lun);
718 printk(KERN_CONT " command = ");
719 command = cmd->cmnd;
720 printk(KERN_CONT "%2d (0x%02x)", command[0], command[0]);
721 for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i)
722 printk(KERN_CONT " %02x", command[i]);
723 printk("\n");
724}
725
Roman Zippelc28bda22007-05-01 22:32:36 +0200726static void NCR5380_print_status(struct Scsi_Host *instance)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727{
Al Virod89537e2013-03-31 13:24:44 -0400728 struct NCR5380_hostdata *hostdata;
729 Scsi_Cmnd *ptr;
730 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731
Finn Thain8ad3a592014-03-18 11:42:19 +1100732 NCR5380_dprint(NDEBUG_ANY, instance);
733 NCR5380_dprint_phase(NDEBUG_ANY, instance);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734
Roman Zippelc28bda22007-05-01 22:32:36 +0200735 hostdata = (struct NCR5380_hostdata *)instance->hostdata;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736
Al Virod89537e2013-03-31 13:24:44 -0400737 printk("\nNCR5380 core release=%d.\n", NCR5380_PUBLIC_RELEASE);
Roman Zippelc28bda22007-05-01 22:32:36 +0200738 local_irq_save(flags);
Al Virod89537e2013-03-31 13:24:44 -0400739 printk("NCR5380: coroutine is%s running.\n",
Roman Zippelc28bda22007-05-01 22:32:36 +0200740 main_running ? "" : "n't");
Roman Zippelc28bda22007-05-01 22:32:36 +0200741 if (!hostdata->connected)
Al Virod89537e2013-03-31 13:24:44 -0400742 printk("scsi%d: no currently connected command\n", HOSTNO);
Roman Zippelc28bda22007-05-01 22:32:36 +0200743 else
Al Virod89537e2013-03-31 13:24:44 -0400744 lprint_Scsi_Cmnd((Scsi_Cmnd *) hostdata->connected);
745 printk("scsi%d: issue_queue\n", HOSTNO);
746 for (ptr = (Scsi_Cmnd *)hostdata->issue_queue; ptr; ptr = NEXT(ptr))
747 lprint_Scsi_Cmnd(ptr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700748
Al Virod89537e2013-03-31 13:24:44 -0400749 printk("scsi%d: disconnected_queue\n", HOSTNO);
Roman Zippelc28bda22007-05-01 22:32:36 +0200750 for (ptr = (Scsi_Cmnd *) hostdata->disconnected_queue; ptr;
Al Virod89537e2013-03-31 13:24:44 -0400751 ptr = NEXT(ptr))
752 lprint_Scsi_Cmnd(ptr);
Roman Zippelc28bda22007-05-01 22:32:36 +0200753
754 local_irq_restore(flags);
Al Virod89537e2013-03-31 13:24:44 -0400755 printk("\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756}
757
Al Virod89537e2013-03-31 13:24:44 -0400758static void show_Scsi_Cmnd(Scsi_Cmnd *cmd, struct seq_file *m)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700759{
Roman Zippelc28bda22007-05-01 22:32:36 +0200760 int i, s;
761 unsigned char *command;
Al Virod89537e2013-03-31 13:24:44 -0400762 seq_printf(m, "scsi%d: destination target %d, lun %d\n",
Roman Zippelc28bda22007-05-01 22:32:36 +0200763 H_NO(cmd), cmd->device->id, cmd->device->lun);
Al Virod89537e2013-03-31 13:24:44 -0400764 seq_printf(m, " command = ");
Roman Zippelc28bda22007-05-01 22:32:36 +0200765 command = cmd->cmnd;
Al Virod89537e2013-03-31 13:24:44 -0400766 seq_printf(m, "%2d (0x%02x)", command[0], command[0]);
Roman Zippelc28bda22007-05-01 22:32:36 +0200767 for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i)
Al Virod89537e2013-03-31 13:24:44 -0400768 seq_printf(m, " %02x", command[i]);
769 seq_printf(m, "\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770}
771
Al Virod89537e2013-03-31 13:24:44 -0400772static int NCR5380_show_info(struct seq_file *m, struct Scsi_Host *instance)
773{
774 struct NCR5380_hostdata *hostdata;
775 Scsi_Cmnd *ptr;
776 unsigned long flags;
777
778 hostdata = (struct NCR5380_hostdata *)instance->hostdata;
779
780 seq_printf(m, "NCR5380 core release=%d.\n", NCR5380_PUBLIC_RELEASE);
781 local_irq_save(flags);
782 seq_printf(m, "NCR5380: coroutine is%s running.\n",
783 main_running ? "" : "n't");
784 if (!hostdata->connected)
785 seq_printf(m, "scsi%d: no currently connected command\n", HOSTNO);
786 else
787 show_Scsi_Cmnd((Scsi_Cmnd *) hostdata->connected, m);
788 seq_printf(m, "scsi%d: issue_queue\n", HOSTNO);
789 for (ptr = (Scsi_Cmnd *)hostdata->issue_queue; ptr; ptr = NEXT(ptr))
790 show_Scsi_Cmnd(ptr, m);
791
792 seq_printf(m, "scsi%d: disconnected_queue\n", HOSTNO);
793 for (ptr = (Scsi_Cmnd *) hostdata->disconnected_queue; ptr;
794 ptr = NEXT(ptr))
795 show_Scsi_Cmnd(ptr, m);
796
797 local_irq_restore(flags);
798 return 0;
799}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800
Roman Zippelc28bda22007-05-01 22:32:36 +0200801/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700802 * Function : void NCR5380_init (struct Scsi_Host *instance)
803 *
804 * Purpose : initializes *instance and corresponding 5380 chip.
805 *
Roman Zippelc28bda22007-05-01 22:32:36 +0200806 * Inputs : instance - instantiation of the 5380 driver.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807 *
808 * Notes : I assume that the host, hostno, and id bits have been
Roman Zippelc28bda22007-05-01 22:32:36 +0200809 * set correctly. I don't care about the irq and other fields.
810 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811 */
812
Michael Schmitz95fde7a2009-01-18 03:22:15 +0100813static int __init NCR5380_init(struct Scsi_Host *instance, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700814{
Roman Zippelc28bda22007-05-01 22:32:36 +0200815 int i;
816 SETUP_HOSTDATA(instance);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817
Roman Zippelc28bda22007-05-01 22:32:36 +0200818 NCR5380_all_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819
Roman Zippelc28bda22007-05-01 22:32:36 +0200820 hostdata->aborted = 0;
821 hostdata->id_mask = 1 << instance->this_id;
822 hostdata->id_higher_mask = 0;
823 for (i = hostdata->id_mask; i <= 0x80; i <<= 1)
824 if (i > hostdata->id_mask)
825 hostdata->id_higher_mask |= i;
826 for (i = 0; i < 8; ++i)
827 hostdata->busy[i] = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828#ifdef SUPPORT_TAGS
Roman Zippelc28bda22007-05-01 22:32:36 +0200829 init_tags();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830#endif
831#if defined (REAL_DMA)
Roman Zippelc28bda22007-05-01 22:32:36 +0200832 hostdata->dma_len = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700833#endif
Roman Zippelc28bda22007-05-01 22:32:36 +0200834 hostdata->targets_present = 0;
835 hostdata->connected = NULL;
836 hostdata->issue_queue = NULL;
837 hostdata->disconnected_queue = NULL;
838 hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839
Roman Zippelc28bda22007-05-01 22:32:36 +0200840 if (!the_template) {
841 the_template = instance->hostt;
842 first_instance = instance;
843 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700844
845#ifndef AUTOSENSE
Roman Zippelc28bda22007-05-01 22:32:36 +0200846 if ((instance->cmd_per_lun > 1) || (instance->can_queue > 1))
847 printk("scsi%d: WARNING : support for multiple outstanding commands enabled\n"
848 " without AUTOSENSE option, contingent allegiance conditions may\n"
849 " be incorrectly cleared.\n", HOSTNO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850#endif /* def AUTOSENSE */
851
Roman Zippelc28bda22007-05-01 22:32:36 +0200852 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
853 NCR5380_write(MODE_REG, MR_BASE);
854 NCR5380_write(TARGET_COMMAND_REG, 0);
855 NCR5380_write(SELECT_ENABLE_REG, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856
Roman Zippelc28bda22007-05-01 22:32:36 +0200857 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700858}
859
Geert Uytterhoeven6323e4f2011-06-13 20:39:15 +0200860static void NCR5380_exit(struct Scsi_Host *instance)
861{
862 /* Empty, as we didn't schedule any delayed work */
863}
864
Roman Zippelc28bda22007-05-01 22:32:36 +0200865/*
Roman Zippelc28bda22007-05-01 22:32:36 +0200866 * Function : int NCR5380_queue_command (Scsi_Cmnd *cmd,
867 * void (*done)(Scsi_Cmnd *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868 *
869 * Purpose : enqueues a SCSI command
870 *
871 * Inputs : cmd - SCSI command, done - function called on completion, with
872 * a pointer to the command descriptor.
Roman Zippelc28bda22007-05-01 22:32:36 +0200873 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874 * Returns : 0
875 *
Roman Zippelc28bda22007-05-01 22:32:36 +0200876 * Side effects :
877 * cmd is added to the per instance issue_queue, with minor
878 * twiddling done to the host specific fields of cmd. If the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700879 * main coroutine is not running, it is restarted.
880 *
881 */
882
Jeff Garzikf2812332010-11-16 02:10:29 -0500883static int NCR5380_queue_command_lck(Scsi_Cmnd *cmd, void (*done)(Scsi_Cmnd *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700884{
Roman Zippelc28bda22007-05-01 22:32:36 +0200885 SETUP_HOSTDATA(cmd->device->host);
886 Scsi_Cmnd *tmp;
Roman Zippelc28bda22007-05-01 22:32:36 +0200887 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700888
889#if (NDEBUG & NDEBUG_NO_WRITE)
Roman Zippelc28bda22007-05-01 22:32:36 +0200890 switch (cmd->cmnd[0]) {
891 case WRITE_6:
892 case WRITE_10:
893 printk(KERN_NOTICE "scsi%d: WRITE attempted with NO_WRITE debugging flag set\n",
894 H_NO(cmd));
895 cmd->result = (DID_ERROR << 16);
896 done(cmd);
897 return 0;
898 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899#endif /* (NDEBUG & NDEBUG_NO_WRITE) */
900
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901#ifdef NCR5380_STATS
902# if 0
Roman Zippelc28bda22007-05-01 22:32:36 +0200903 if (!hostdata->connected && !hostdata->issue_queue &&
904 !hostdata->disconnected_queue) {
905 hostdata->timebase = jiffies;
906 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700907# endif
908# ifdef NCR5380_STAT_LIMIT
Boaz Harrosh9e0fe442007-11-05 11:23:35 +0200909 if (scsi_bufflen(cmd) > NCR5380_STAT_LIMIT)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700910# endif
Roman Zippelc28bda22007-05-01 22:32:36 +0200911 switch (cmd->cmnd[0]) {
912 case WRITE:
913 case WRITE_6:
914 case WRITE_10:
915 hostdata->time_write[cmd->device->id] -= (jiffies - hostdata->timebase);
Boaz Harrosh9e0fe442007-11-05 11:23:35 +0200916 hostdata->bytes_write[cmd->device->id] += scsi_bufflen(cmd);
Roman Zippelc28bda22007-05-01 22:32:36 +0200917 hostdata->pendingw++;
918 break;
919 case READ:
920 case READ_6:
921 case READ_10:
922 hostdata->time_read[cmd->device->id] -= (jiffies - hostdata->timebase);
Boaz Harrosh9e0fe442007-11-05 11:23:35 +0200923 hostdata->bytes_read[cmd->device->id] += scsi_bufflen(cmd);
Roman Zippelc28bda22007-05-01 22:32:36 +0200924 hostdata->pendingr++;
925 break;
926 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700927#endif
928
Roman Zippelc28bda22007-05-01 22:32:36 +0200929 /*
930 * We use the host_scribble field as a pointer to the next command
931 * in a queue
932 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700933
Roman Zippel3130d902007-05-01 22:32:37 +0200934 SET_NEXT(cmd, NULL);
Roman Zippelc28bda22007-05-01 22:32:36 +0200935 cmd->scsi_done = done;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700936
Roman Zippelc28bda22007-05-01 22:32:36 +0200937 cmd->result = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700938
Roman Zippelc28bda22007-05-01 22:32:36 +0200939 /*
940 * Insert the cmd into the issue queue. Note that REQUEST SENSE
941 * commands are added to the head of the queue since any command will
942 * clear the contingent allegiance condition that exists and the
943 * sense data is only guaranteed to be valid while the condition exists.
944 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700945
Roman Zippelc28bda22007-05-01 22:32:36 +0200946 local_irq_save(flags);
947 /* ++guenther: now that the issue queue is being set up, we can lock ST-DMA.
948 * Otherwise a running NCR5380_main may steal the lock.
949 * Lock before actually inserting due to fairness reasons explained in
950 * atari_scsi.c. If we insert first, then it's impossible for this driver
951 * to release the lock.
952 * Stop timer for this command while waiting for the lock, or timeouts
953 * may happen (and they really do), and it's no good if the command doesn't
954 * appear in any of the queues.
955 * ++roman: Just disabling the NCR interrupt isn't sufficient here,
956 * because also a timer int can trigger an abort or reset, which would
957 * alter queues and touch the lock.
958 */
959 if (!IS_A_TT()) {
Michael Schmitz8ce79552007-06-03 12:55:04 +0200960 /* perhaps stop command timer here */
Roman Zippelc28bda22007-05-01 22:32:36 +0200961 falcon_get_lock();
Michael Schmitz8ce79552007-06-03 12:55:04 +0200962 /* perhaps restart command timer here */
Roman Zippelc28bda22007-05-01 22:32:36 +0200963 }
964 if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) {
965 LIST(cmd, hostdata->issue_queue);
Roman Zippel3130d902007-05-01 22:32:37 +0200966 SET_NEXT(cmd, hostdata->issue_queue);
Roman Zippelc28bda22007-05-01 22:32:36 +0200967 hostdata->issue_queue = cmd;
968 } else {
969 for (tmp = (Scsi_Cmnd *)hostdata->issue_queue;
970 NEXT(tmp); tmp = NEXT(tmp))
971 ;
972 LIST(cmd, tmp);
Roman Zippel3130d902007-05-01 22:32:37 +0200973 SET_NEXT(tmp, cmd);
Roman Zippelc28bda22007-05-01 22:32:36 +0200974 }
975 local_irq_restore(flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976
Finn Thaind65e6342014-03-18 11:42:20 +1100977 dprintk(NDEBUG_QUEUES, "scsi%d: command added to %s of queue\n", H_NO(cmd),
Roman Zippelc28bda22007-05-01 22:32:36 +0200978 (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700979
Roman Zippelc28bda22007-05-01 22:32:36 +0200980 /* If queue_command() is called from an interrupt (real one or bottom
981 * half), we let queue_main() do the job of taking care about main. If it
982 * is already running, this is a no-op, else main will be queued.
983 *
984 * If we're not in an interrupt, we can call NCR5380_main()
985 * unconditionally, because it cannot be already running.
986 */
987 if (in_interrupt() || ((flags >> 8) & 7) >= 6)
988 queue_main();
989 else
990 NCR5380_main(NULL);
991 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700992}
993
Jeff Garzikf2812332010-11-16 02:10:29 -0500994static DEF_SCSI_QCMD(NCR5380_queue_command)
995
Linus Torvalds1da177e2005-04-16 15:20:36 -0700996/*
Roman Zippelc28bda22007-05-01 22:32:36 +0200997 * Function : NCR5380_main (void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700998 *
Roman Zippelc28bda22007-05-01 22:32:36 +0200999 * Purpose : NCR5380_main is a coroutine that runs as long as more work can
1000 * be done on the NCR5380 host adapters in a system. Both
1001 * NCR5380_queue_command() and NCR5380_intr() will try to start it
Linus Torvalds1da177e2005-04-16 15:20:36 -07001002 * in case it is not running.
Roman Zippelc28bda22007-05-01 22:32:36 +02001003 *
1004 * NOTE : NCR5380_main exits with interrupts *disabled*, the caller should
Linus Torvalds1da177e2005-04-16 15:20:36 -07001005 * reenable them. This prevents reentrancy and kernel stack overflow.
Roman Zippelc28bda22007-05-01 22:32:36 +02001006 */
1007
Geert Uytterhoevenb312b382007-05-01 22:32:48 +02001008static void NCR5380_main(struct work_struct *work)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001009{
Roman Zippelc28bda22007-05-01 22:32:36 +02001010 Scsi_Cmnd *tmp, *prev;
1011 struct Scsi_Host *instance = first_instance;
1012 struct NCR5380_hostdata *hostdata = HOSTDATA(instance);
1013 int done;
1014 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015
Roman Zippelc28bda22007-05-01 22:32:36 +02001016 /*
1017 * We run (with interrupts disabled) until we're sure that none of
1018 * the host adapters have anything that can be done, at which point
1019 * we set main_running to 0 and exit.
1020 *
1021 * Interrupts are enabled before doing various other internal
1022 * instructions, after we've decided that we need to run through
1023 * the loop again.
1024 *
1025 * this should prevent any race conditions.
1026 *
1027 * ++roman: Just disabling the NCR interrupt isn't sufficient here,
1028 * because also a timer int can trigger an abort or reset, which can
1029 * alter queues and touch the Falcon lock.
1030 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001031
Roman Zippelc28bda22007-05-01 22:32:36 +02001032 /* Tell int handlers main() is now already executing. Note that
1033 no races are possible here. If an int comes in before
1034 'main_running' is set here, and queues/executes main via the
1035 task queue, it doesn't do any harm, just this instance of main
1036 won't find any work left to do. */
1037 if (main_running)
1038 return;
1039 main_running = 1;
1040
1041 local_save_flags(flags);
1042 do {
1043 local_irq_disable(); /* Freeze request queues */
1044 done = 1;
1045
1046 if (!hostdata->connected) {
Finn Thaind65e6342014-03-18 11:42:20 +11001047 dprintk(NDEBUG_MAIN, "scsi%d: not connected\n", HOSTNO);
Roman Zippelc28bda22007-05-01 22:32:36 +02001048 /*
1049 * Search through the issue_queue for a command destined
1050 * for a target that's not busy.
1051 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001052#if (NDEBUG & NDEBUG_LISTS)
Roman Zippelc28bda22007-05-01 22:32:36 +02001053 for (tmp = (Scsi_Cmnd *) hostdata->issue_queue, prev = NULL;
1054 tmp && (tmp != prev); prev = tmp, tmp = NEXT(tmp))
1055 ;
1056 /*printk("%p ", tmp);*/
1057 if ((tmp == prev) && tmp)
1058 printk(" LOOP\n");
1059 /* else printk("\n"); */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001060#endif
Roman Zippelc28bda22007-05-01 22:32:36 +02001061 for (tmp = (Scsi_Cmnd *) hostdata->issue_queue,
1062 prev = NULL; tmp; prev = tmp, tmp = NEXT(tmp)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001063
1064#if (NDEBUG & NDEBUG_LISTS)
Roman Zippelc28bda22007-05-01 22:32:36 +02001065 if (prev != tmp)
1066 printk("MAIN tmp=%p target=%d busy=%d lun=%d\n",
1067 tmp, tmp->device->id, hostdata->busy[tmp->device->id],
1068 tmp->device->lun);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001069#endif
Roman Zippelc28bda22007-05-01 22:32:36 +02001070 /* When we find one, remove it from the issue queue. */
1071 /* ++guenther: possible race with Falcon locking */
1072 if (
Linus Torvalds1da177e2005-04-16 15:20:36 -07001073#ifdef SUPPORT_TAGS
Roman Zippelc28bda22007-05-01 22:32:36 +02001074 !is_lun_busy( tmp, tmp->cmnd[0] != REQUEST_SENSE)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001075#else
Roman Zippelc28bda22007-05-01 22:32:36 +02001076 !(hostdata->busy[tmp->device->id] & (1 << tmp->device->lun))
1077#endif
1078 ) {
1079 /* ++guenther: just to be sure, this must be atomic */
1080 local_irq_disable();
1081 if (prev) {
1082 REMOVE(prev, NEXT(prev), tmp, NEXT(tmp));
Roman Zippel3130d902007-05-01 22:32:37 +02001083 SET_NEXT(prev, NEXT(tmp));
Roman Zippelc28bda22007-05-01 22:32:36 +02001084 } else {
1085 REMOVE(-1, hostdata->issue_queue, tmp, NEXT(tmp));
1086 hostdata->issue_queue = NEXT(tmp);
1087 }
Roman Zippel3130d902007-05-01 22:32:37 +02001088 SET_NEXT(tmp, NULL);
Roman Zippelc28bda22007-05-01 22:32:36 +02001089 falcon_dont_release++;
1090
1091 /* reenable interrupts after finding one */
1092 local_irq_restore(flags);
1093
1094 /*
1095 * Attempt to establish an I_T_L nexus here.
1096 * On success, instance->hostdata->connected is set.
1097 * On failure, we must add the command back to the
1098 * issue queue so we can keep trying.
1099 */
Finn Thaind65e6342014-03-18 11:42:20 +11001100 dprintk(NDEBUG_MAIN, "scsi%d: main(): command for target %d "
Roman Zippelc28bda22007-05-01 22:32:36 +02001101 "lun %d removed from issue_queue\n",
1102 HOSTNO, tmp->device->id, tmp->device->lun);
1103 /*
1104 * REQUEST SENSE commands are issued without tagged
1105 * queueing, even on SCSI-II devices because the
1106 * contingent allegiance condition exists for the
1107 * entire unit.
1108 */
1109 /* ++roman: ...and the standard also requires that
1110 * REQUEST SENSE command are untagged.
1111 */
1112
1113#ifdef SUPPORT_TAGS
1114 cmd_get_tag(tmp, tmp->cmnd[0] != REQUEST_SENSE);
1115#endif
1116 if (!NCR5380_select(instance, tmp,
1117 (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE :
1118 TAG_NEXT)) {
1119 falcon_dont_release--;
1120 /* release if target did not response! */
1121 falcon_release_lock_if_possible(hostdata);
1122 break;
1123 } else {
1124 local_irq_disable();
1125 LIST(tmp, hostdata->issue_queue);
Roman Zippel3130d902007-05-01 22:32:37 +02001126 SET_NEXT(tmp, hostdata->issue_queue);
Roman Zippelc28bda22007-05-01 22:32:36 +02001127 hostdata->issue_queue = tmp;
1128#ifdef SUPPORT_TAGS
1129 cmd_free_tag(tmp);
1130#endif
1131 falcon_dont_release--;
1132 local_irq_restore(flags);
Finn Thaind65e6342014-03-18 11:42:20 +11001133 dprintk(NDEBUG_MAIN, "scsi%d: main(): select() failed, "
Roman Zippelc28bda22007-05-01 22:32:36 +02001134 "returned to issue_queue\n", HOSTNO);
1135 if (hostdata->connected)
1136 break;
1137 }
1138 } /* if target/lun/target queue is not busy */
1139 } /* for issue_queue */
1140 } /* if (!hostdata->connected) */
1141
1142 if (hostdata->connected
1143#ifdef REAL_DMA
1144 && !hostdata->dma_len
Linus Torvalds1da177e2005-04-16 15:20:36 -07001145#endif
1146 ) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001147 local_irq_restore(flags);
Finn Thaind65e6342014-03-18 11:42:20 +11001148 dprintk(NDEBUG_MAIN, "scsi%d: main: performing information transfer\n",
Roman Zippelc28bda22007-05-01 22:32:36 +02001149 HOSTNO);
1150 NCR5380_information_transfer(instance);
Finn Thaind65e6342014-03-18 11:42:20 +11001151 dprintk(NDEBUG_MAIN, "scsi%d: main: done set false\n", HOSTNO);
Roman Zippelc28bda22007-05-01 22:32:36 +02001152 done = 0;
1153 }
1154 } while (!done);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001155
Roman Zippelc28bda22007-05-01 22:32:36 +02001156 /* Better allow ints _after_ 'main_running' has been cleared, else
1157 an interrupt could believe we'll pick up the work it left for
1158 us, but we won't see it anymore here... */
1159 main_running = 0;
1160 local_irq_restore(flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001161}
1162
1163
1164#ifdef REAL_DMA
1165/*
1166 * Function : void NCR5380_dma_complete (struct Scsi_Host *instance)
1167 *
1168 * Purpose : Called by interrupt handler when DMA finishes or a phase
Roman Zippelc28bda22007-05-01 22:32:36 +02001169 * mismatch occurs (which would finish the DMA transfer).
Linus Torvalds1da177e2005-04-16 15:20:36 -07001170 *
1171 * Inputs : instance - this instance of the NCR5380.
1172 *
1173 */
1174
Roman Zippelc28bda22007-05-01 22:32:36 +02001175static void NCR5380_dma_complete(struct Scsi_Host *instance)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001176{
Roman Zippelc28bda22007-05-01 22:32:36 +02001177 SETUP_HOSTDATA(instance);
1178 int transfered, saved_data = 0, overrun = 0, cnt, toPIO;
1179 unsigned char **data, p;
1180 volatile int *count;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001181
Roman Zippelc28bda22007-05-01 22:32:36 +02001182 if (!hostdata->connected) {
1183 printk(KERN_WARNING "scsi%d: received end of DMA interrupt with "
1184 "no connected cmd\n", HOSTNO);
1185 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001186 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001187
Roman Zippelc28bda22007-05-01 22:32:36 +02001188 if (atari_read_overruns) {
1189 p = hostdata->connected->SCp.phase;
1190 if (p & SR_IO) {
1191 udelay(10);
1192 if ((NCR5380_read(BUS_AND_STATUS_REG) &
1193 (BASR_PHASE_MATCH|BASR_ACK)) ==
1194 (BASR_PHASE_MATCH|BASR_ACK)) {
1195 saved_data = NCR5380_read(INPUT_DATA_REG);
1196 overrun = 1;
Finn Thaind65e6342014-03-18 11:42:20 +11001197 dprintk(NDEBUG_DMA, "scsi%d: read overrun handled\n", HOSTNO);
Roman Zippelc28bda22007-05-01 22:32:36 +02001198 }
1199 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001200 }
Roman Zippelc28bda22007-05-01 22:32:36 +02001201
Finn Thaind65e6342014-03-18 11:42:20 +11001202 dprintk(NDEBUG_DMA, "scsi%d: real DMA transfer complete, basr 0x%X, sr 0x%X\n",
Roman Zippelc28bda22007-05-01 22:32:36 +02001203 HOSTNO, NCR5380_read(BUS_AND_STATUS_REG),
1204 NCR5380_read(STATUS_REG));
1205
1206 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1207 NCR5380_write(MODE_REG, MR_BASE);
1208 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1209
1210 transfered = hostdata->dma_len - NCR5380_dma_residual(instance);
1211 hostdata->dma_len = 0;
1212
1213 data = (unsigned char **)&hostdata->connected->SCp.ptr;
1214 count = &hostdata->connected->SCp.this_residual;
1215 *data += transfered;
1216 *count -= transfered;
1217
1218 if (atari_read_overruns) {
1219 if ((NCR5380_read(STATUS_REG) & PHASE_MASK) == p && (p & SR_IO)) {
1220 cnt = toPIO = atari_read_overruns;
1221 if (overrun) {
Finn Thaind65e6342014-03-18 11:42:20 +11001222 dprintk(NDEBUG_DMA, "Got an input overrun, using saved byte\n");
Roman Zippelc28bda22007-05-01 22:32:36 +02001223 *(*data)++ = saved_data;
1224 (*count)--;
1225 cnt--;
1226 toPIO--;
1227 }
Finn Thaind65e6342014-03-18 11:42:20 +11001228 dprintk(NDEBUG_DMA, "Doing %d-byte PIO to 0x%08lx\n", cnt, (long)*data);
Roman Zippelc28bda22007-05-01 22:32:36 +02001229 NCR5380_transfer_pio(instance, &p, &cnt, data);
1230 *count -= toPIO - cnt;
1231 }
1232 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001233}
1234#endif /* REAL_DMA */
1235
1236
1237/*
1238 * Function : void NCR5380_intr (int irq)
Roman Zippelc28bda22007-05-01 22:32:36 +02001239 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001240 * Purpose : handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses
Roman Zippelc28bda22007-05-01 22:32:36 +02001241 * from the disconnected queue, and restarting NCR5380_main()
Linus Torvalds1da177e2005-04-16 15:20:36 -07001242 * as required.
1243 *
1244 * Inputs : int irq, irq that caused this interrupt.
1245 *
1246 */
1247
Roman Zippelc28bda22007-05-01 22:32:36 +02001248static irqreturn_t NCR5380_intr(int irq, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001249{
Roman Zippelc28bda22007-05-01 22:32:36 +02001250 struct Scsi_Host *instance = first_instance;
1251 int done = 1, handled = 0;
1252 unsigned char basr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001253
Finn Thaind65e6342014-03-18 11:42:20 +11001254 dprintk(NDEBUG_INTR, "scsi%d: NCR5380 irq triggered\n", HOSTNO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001255
Roman Zippelc28bda22007-05-01 22:32:36 +02001256 /* Look for pending interrupts */
1257 basr = NCR5380_read(BUS_AND_STATUS_REG);
Finn Thaind65e6342014-03-18 11:42:20 +11001258 dprintk(NDEBUG_INTR, "scsi%d: BASR=%02x\n", HOSTNO, basr);
Roman Zippelc28bda22007-05-01 22:32:36 +02001259 /* dispatch to appropriate routine if found and done=0 */
1260 if (basr & BASR_IRQ) {
Finn Thain8ad3a592014-03-18 11:42:19 +11001261 NCR5380_dprint(NDEBUG_INTR, instance);
Roman Zippelc28bda22007-05-01 22:32:36 +02001262 if ((NCR5380_read(STATUS_REG) & (SR_SEL|SR_IO)) == (SR_SEL|SR_IO)) {
1263 done = 0;
1264 ENABLE_IRQ();
Finn Thaind65e6342014-03-18 11:42:20 +11001265 dprintk(NDEBUG_INTR, "scsi%d: SEL interrupt\n", HOSTNO);
Roman Zippelc28bda22007-05-01 22:32:36 +02001266 NCR5380_reselect(instance);
1267 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1268 } else if (basr & BASR_PARITY_ERROR) {
Finn Thaind65e6342014-03-18 11:42:20 +11001269 dprintk(NDEBUG_INTR, "scsi%d: PARITY interrupt\n", HOSTNO);
Roman Zippelc28bda22007-05-01 22:32:36 +02001270 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1271 } else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) {
Finn Thaind65e6342014-03-18 11:42:20 +11001272 dprintk(NDEBUG_INTR, "scsi%d: RESET interrupt\n", HOSTNO);
Roman Zippelc28bda22007-05-01 22:32:36 +02001273 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1274 } else {
1275 /*
1276 * The rest of the interrupt conditions can occur only during a
1277 * DMA transfer
1278 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001279
1280#if defined(REAL_DMA)
Roman Zippelc28bda22007-05-01 22:32:36 +02001281 /*
1282 * We should only get PHASE MISMATCH and EOP interrupts if we have
1283 * DMA enabled, so do a sanity check based on the current setting
1284 * of the MODE register.
1285 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001286
Roman Zippelc28bda22007-05-01 22:32:36 +02001287 if ((NCR5380_read(MODE_REG) & MR_DMA_MODE) &&
1288 ((basr & BASR_END_DMA_TRANSFER) ||
1289 !(basr & BASR_PHASE_MATCH))) {
1290
Finn Thaind65e6342014-03-18 11:42:20 +11001291 dprintk(NDEBUG_INTR, "scsi%d: PHASE MISM or EOP interrupt\n", HOSTNO);
Roman Zippelc28bda22007-05-01 22:32:36 +02001292 NCR5380_dma_complete( instance );
1293 done = 0;
1294 ENABLE_IRQ();
1295 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -07001296#endif /* REAL_DMA */
Roman Zippelc28bda22007-05-01 22:32:36 +02001297 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001298/* MS: Ignore unknown phase mismatch interrupts (caused by EOP interrupt) */
Roman Zippelc28bda22007-05-01 22:32:36 +02001299 if (basr & BASR_PHASE_MATCH)
1300 printk(KERN_NOTICE "scsi%d: unknown interrupt, "
1301 "BASR 0x%x, MR 0x%x, SR 0x%x\n",
1302 HOSTNO, basr, NCR5380_read(MODE_REG),
1303 NCR5380_read(STATUS_REG));
1304 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1305 }
1306 } /* if !(SELECTION || PARITY) */
1307 handled = 1;
1308 } /* BASR & IRQ */ else {
1309 printk(KERN_NOTICE "scsi%d: interrupt without IRQ bit set in BASR, "
1310 "BASR 0x%X, MR 0x%X, SR 0x%x\n", HOSTNO, basr,
1311 NCR5380_read(MODE_REG), NCR5380_read(STATUS_REG));
1312 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1313 }
1314
1315 if (!done) {
Finn Thaind65e6342014-03-18 11:42:20 +11001316 dprintk(NDEBUG_INTR, "scsi%d: in int routine, calling main\n", HOSTNO);
Roman Zippelc28bda22007-05-01 22:32:36 +02001317 /* Put a call to NCR5380_main() on the queue... */
1318 queue_main();
1319 }
1320 return IRQ_RETVAL(handled);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001321}
1322
1323#ifdef NCR5380_STATS
Roman Zippelc28bda22007-05-01 22:32:36 +02001324static void collect_stats(struct NCR5380_hostdata* hostdata, Scsi_Cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001325{
1326# ifdef NCR5380_STAT_LIMIT
Boaz Harrosh9e0fe442007-11-05 11:23:35 +02001327 if (scsi_bufflen(cmd) > NCR5380_STAT_LIMIT)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001328# endif
Roman Zippelc28bda22007-05-01 22:32:36 +02001329 switch (cmd->cmnd[0]) {
1330 case WRITE:
1331 case WRITE_6:
1332 case WRITE_10:
1333 hostdata->time_write[cmd->device->id] += (jiffies - hostdata->timebase);
Boaz Harrosh9e0fe442007-11-05 11:23:35 +02001334 /*hostdata->bytes_write[cmd->device->id] += scsi_bufflen(cmd);*/
Roman Zippelc28bda22007-05-01 22:32:36 +02001335 hostdata->pendingw--;
1336 break;
1337 case READ:
1338 case READ_6:
1339 case READ_10:
1340 hostdata->time_read[cmd->device->id] += (jiffies - hostdata->timebase);
Boaz Harrosh9e0fe442007-11-05 11:23:35 +02001341 /*hostdata->bytes_read[cmd->device->id] += scsi_bufflen(cmd);*/
Roman Zippelc28bda22007-05-01 22:32:36 +02001342 hostdata->pendingr--;
1343 break;
1344 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001345}
1346#endif
1347
Roman Zippelc28bda22007-05-01 22:32:36 +02001348/*
1349 * Function : int NCR5380_select (struct Scsi_Host *instance, Scsi_Cmnd *cmd,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001350 * int tag);
1351 *
1352 * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command,
Roman Zippelc28bda22007-05-01 22:32:36 +02001353 * including ARBITRATION, SELECTION, and initial message out for
1354 * IDENTIFY and queue messages.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001355 *
Roman Zippelc28bda22007-05-01 22:32:36 +02001356 * Inputs : instance - instantiation of the 5380 driver on which this
1357 * target lives, cmd - SCSI command to execute, tag - set to TAG_NEXT for
1358 * new tag, TAG_NONE for untagged queueing, otherwise set to the tag for
Linus Torvalds1da177e2005-04-16 15:20:36 -07001359 * the command that is presently connected.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001360 *
Roman Zippelc28bda22007-05-01 22:32:36 +02001361 * Returns : -1 if selection could not execute for some reason,
1362 * 0 if selection succeeded or failed because the target
1363 * did not respond.
1364 *
1365 * Side effects :
1366 * If bus busy, arbitration failed, etc, NCR5380_select() will exit
Linus Torvalds1da177e2005-04-16 15:20:36 -07001367 * with registers as they should have been on entry - ie
1368 * SELECT_ENABLE will be set appropriately, the NCR5380
1369 * will cease to drive any SCSI bus signals.
1370 *
Roman Zippelc28bda22007-05-01 22:32:36 +02001371 * If successful : I_T_L or I_T_L_Q nexus will be established,
1372 * instance->connected will be set to cmd.
1373 * SELECT interrupt will be disabled.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001374 *
Roman Zippelc28bda22007-05-01 22:32:36 +02001375 * If failed (no target) : cmd->scsi_done() will be called, and the
Linus Torvalds1da177e2005-04-16 15:20:36 -07001376 * cmd->result host byte set to DID_BAD_TARGET.
1377 */
1378
Roman Zippelc28bda22007-05-01 22:32:36 +02001379static int NCR5380_select(struct Scsi_Host *instance, Scsi_Cmnd *cmd, int tag)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001380{
Roman Zippelc28bda22007-05-01 22:32:36 +02001381 SETUP_HOSTDATA(instance);
1382 unsigned char tmp[3], phase;
1383 unsigned char *data;
1384 int len;
1385 unsigned long timeout;
1386 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001387
Roman Zippelc28bda22007-05-01 22:32:36 +02001388 hostdata->restart_select = 0;
Finn Thain8ad3a592014-03-18 11:42:19 +11001389 NCR5380_dprint(NDEBUG_ARBITRATION, instance);
Finn Thaind65e6342014-03-18 11:42:20 +11001390 dprintk(NDEBUG_ARBITRATION, "scsi%d: starting arbitration, id = %d\n", HOSTNO,
Roman Zippelc28bda22007-05-01 22:32:36 +02001391 instance->this_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001392
Roman Zippelc28bda22007-05-01 22:32:36 +02001393 /*
1394 * Set the phase bits to 0, otherwise the NCR5380 won't drive the
1395 * data bus during SELECTION.
1396 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001397
Roman Zippelc28bda22007-05-01 22:32:36 +02001398 local_irq_save(flags);
1399 if (hostdata->connected) {
1400 local_irq_restore(flags);
1401 return -1;
1402 }
1403 NCR5380_write(TARGET_COMMAND_REG, 0);
1404
1405 /*
1406 * Start arbitration.
1407 */
1408
1409 NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
1410 NCR5380_write(MODE_REG, MR_ARBITRATE);
1411
Linus Torvalds1da177e2005-04-16 15:20:36 -07001412 local_irq_restore(flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001413
Roman Zippelc28bda22007-05-01 22:32:36 +02001414 /* Wait for arbitration logic to complete */
Michael Schmitzfb810d12007-05-01 22:32:35 +02001415#if defined(NCR_TIMEOUT)
Roman Zippelc28bda22007-05-01 22:32:36 +02001416 {
1417 unsigned long timeout = jiffies + 2*NCR_TIMEOUT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001418
Roman Zippelc28bda22007-05-01 22:32:36 +02001419 while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS) &&
1420 time_before(jiffies, timeout) && !hostdata->connected)
1421 ;
1422 if (time_after_eq(jiffies, timeout)) {
1423 printk("scsi : arbitration timeout at %d\n", __LINE__);
1424 NCR5380_write(MODE_REG, MR_BASE);
1425 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1426 return -1;
1427 }
1428 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001429#else /* NCR_TIMEOUT */
Roman Zippelc28bda22007-05-01 22:32:36 +02001430 while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS) &&
1431 !hostdata->connected)
1432 ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001433#endif
1434
Finn Thaind65e6342014-03-18 11:42:20 +11001435 dprintk(NDEBUG_ARBITRATION, "scsi%d: arbitration complete\n", HOSTNO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001436
Roman Zippelc28bda22007-05-01 22:32:36 +02001437 if (hostdata->connected) {
1438 NCR5380_write(MODE_REG, MR_BASE);
1439 return -1;
1440 }
1441 /*
1442 * The arbitration delay is 2.2us, but this is a minimum and there is
1443 * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate
1444 * the integral nature of udelay().
1445 *
1446 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001447
Roman Zippelc28bda22007-05-01 22:32:36 +02001448 udelay(3);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001449
Roman Zippelc28bda22007-05-01 22:32:36 +02001450 /* Check for lost arbitration */
1451 if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1452 (NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_higher_mask) ||
1453 (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1454 hostdata->connected) {
1455 NCR5380_write(MODE_REG, MR_BASE);
Finn Thaind65e6342014-03-18 11:42:20 +11001456 dprintk(NDEBUG_ARBITRATION, "scsi%d: lost arbitration, deasserting MR_ARBITRATE\n",
Roman Zippelc28bda22007-05-01 22:32:36 +02001457 HOSTNO);
1458 return -1;
1459 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001460
Roman Zippelc28bda22007-05-01 22:32:36 +02001461 /* after/during arbitration, BSY should be asserted.
1462 IBM DPES-31080 Version S31Q works now */
1463 /* Tnx to Thomas_Roesch@m2.maus.de for finding this! (Roman) */
1464 NCR5380_write(INITIATOR_COMMAND_REG,
1465 ICR_BASE | ICR_ASSERT_SEL | ICR_ASSERT_BSY);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001466
Roman Zippelc28bda22007-05-01 22:32:36 +02001467 if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1468 hostdata->connected) {
1469 NCR5380_write(MODE_REG, MR_BASE);
1470 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
Finn Thaind65e6342014-03-18 11:42:20 +11001471 dprintk(NDEBUG_ARBITRATION, "scsi%d: lost arbitration, deasserting ICR_ASSERT_SEL\n",
Roman Zippelc28bda22007-05-01 22:32:36 +02001472 HOSTNO);
1473 return -1;
1474 }
1475
1476 /*
1477 * Again, bus clear + bus settle time is 1.2us, however, this is
1478 * a minimum so we'll udelay ceil(1.2)
1479 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001480
1481#ifdef CONFIG_ATARI_SCSI_TOSHIBA_DELAY
Roman Zippelc28bda22007-05-01 22:32:36 +02001482 /* ++roman: But some targets (see above :-) seem to need a bit more... */
1483 udelay(15);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001484#else
Roman Zippelc28bda22007-05-01 22:32:36 +02001485 udelay(2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001486#endif
Roman Zippelc28bda22007-05-01 22:32:36 +02001487
1488 if (hostdata->connected) {
1489 NCR5380_write(MODE_REG, MR_BASE);
1490 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1491 return -1;
1492 }
1493
Finn Thaind65e6342014-03-18 11:42:20 +11001494 dprintk(NDEBUG_ARBITRATION, "scsi%d: won arbitration\n", HOSTNO);
Roman Zippelc28bda22007-05-01 22:32:36 +02001495
1496 /*
1497 * Now that we have won arbitration, start Selection process, asserting
1498 * the host and target ID's on the SCSI bus.
1499 */
1500
1501 NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << cmd->device->id)));
1502
1503 /*
1504 * Raise ATN while SEL is true before BSY goes false from arbitration,
1505 * since this is the only way to guarantee that we'll get a MESSAGE OUT
1506 * phase immediately after selection.
1507 */
1508
1509 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY |
1510 ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL ));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001511 NCR5380_write(MODE_REG, MR_BASE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001512
Roman Zippelc28bda22007-05-01 22:32:36 +02001513 /*
1514 * Reselect interrupts must be turned off prior to the dropping of BSY,
1515 * otherwise we will trigger an interrupt.
1516 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001517
Roman Zippelc28bda22007-05-01 22:32:36 +02001518 if (hostdata->connected) {
1519 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1520 return -1;
1521 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001522
Roman Zippelc28bda22007-05-01 22:32:36 +02001523 NCR5380_write(SELECT_ENABLE_REG, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001524
Roman Zippelc28bda22007-05-01 22:32:36 +02001525 /*
1526 * The initiator shall then wait at least two deskew delays and release
1527 * the BSY signal.
1528 */
1529 udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001530
Roman Zippelc28bda22007-05-01 22:32:36 +02001531 /* Reset BSY */
1532 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA |
1533 ICR_ASSERT_ATN | ICR_ASSERT_SEL));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001534
Roman Zippelc28bda22007-05-01 22:32:36 +02001535 /*
1536 * Something weird happens when we cease to drive BSY - looks
1537 * like the board/chip is letting us do another read before the
1538 * appropriate propagation delay has expired, and we're confusing
1539 * a BSY signal from ourselves as the target's response to SELECTION.
1540 *
1541 * A small delay (the 'C++' frontend breaks the pipeline with an
1542 * unnecessary jump, making it work on my 386-33/Trantor T128, the
1543 * tighter 'C' code breaks and requires this) solves the problem -
1544 * the 1 us delay is arbitrary, and only used because this delay will
1545 * be the same on other platforms and since it works here, it should
1546 * work there.
1547 *
1548 * wingel suggests that this could be due to failing to wait
1549 * one deskew delay.
1550 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001551
Roman Zippelc28bda22007-05-01 22:32:36 +02001552 udelay(1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001553
Finn Thaind65e6342014-03-18 11:42:20 +11001554 dprintk(NDEBUG_SELECTION, "scsi%d: selecting target %d\n", HOSTNO, cmd->device->id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001555
Roman Zippelc28bda22007-05-01 22:32:36 +02001556 /*
1557 * The SCSI specification calls for a 250 ms timeout for the actual
1558 * selection.
1559 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001560
Roman Zippelc28bda22007-05-01 22:32:36 +02001561 timeout = jiffies + 25;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001562
Roman Zippelc28bda22007-05-01 22:32:36 +02001563 /*
1564 * XXX very interesting - we're seeing a bounce where the BSY we
1565 * asserted is being reflected / still asserted (propagation delay?)
1566 * and it's detecting as true. Sigh.
1567 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001568
1569#if 0
Roman Zippelc28bda22007-05-01 22:32:36 +02001570 /* ++roman: If a target conformed to the SCSI standard, it wouldn't assert
1571 * IO while SEL is true. But again, there are some disks out the in the
1572 * world that do that nevertheless. (Somebody claimed that this announces
1573 * reselection capability of the target.) So we better skip that test and
1574 * only wait for BSY... (Famous german words: Der Klügere gibt nach :-)
1575 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001576
Roman Zippelc28bda22007-05-01 22:32:36 +02001577 while (time_before(jiffies, timeout) &&
1578 !(NCR5380_read(STATUS_REG) & (SR_BSY | SR_IO)))
1579 ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001580
Roman Zippelc28bda22007-05-01 22:32:36 +02001581 if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) {
1582 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1583 NCR5380_reselect(instance);
1584 printk(KERN_ERR "scsi%d: reselection after won arbitration?\n",
1585 HOSTNO);
1586 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1587 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001588 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001589#else
Roman Zippelc28bda22007-05-01 22:32:36 +02001590 while (time_before(jiffies, timeout) && !(NCR5380_read(STATUS_REG) & SR_BSY))
1591 ;
1592#endif
1593
1594 /*
1595 * No less than two deskew delays after the initiator detects the
1596 * BSY signal is true, it shall release the SEL signal and may
1597 * change the DATA BUS. -wingel
1598 */
1599
1600 udelay(1);
1601
1602 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1603
1604 if (!(NCR5380_read(STATUS_REG) & SR_BSY)) {
1605 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1606 if (hostdata->targets_present & (1 << cmd->device->id)) {
1607 printk(KERN_ERR "scsi%d: weirdness\n", HOSTNO);
1608 if (hostdata->restart_select)
1609 printk(KERN_NOTICE "\trestart select\n");
Finn Thain8ad3a592014-03-18 11:42:19 +11001610 NCR5380_dprint(NDEBUG_ANY, instance);
Roman Zippelc28bda22007-05-01 22:32:36 +02001611 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1612 return -1;
1613 }
1614 cmd->result = DID_BAD_TARGET << 16;
1615#ifdef NCR5380_STATS
1616 collect_stats(hostdata, cmd);
1617#endif
1618#ifdef SUPPORT_TAGS
1619 cmd_free_tag(cmd);
1620#endif
1621 cmd->scsi_done(cmd);
1622 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
Finn Thaind65e6342014-03-18 11:42:20 +11001623 dprintk(NDEBUG_SELECTION, "scsi%d: target did not respond within 250ms\n", HOSTNO);
Roman Zippelc28bda22007-05-01 22:32:36 +02001624 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1625 return 0;
1626 }
1627
1628 hostdata->targets_present |= (1 << cmd->device->id);
1629
1630 /*
1631 * Since we followed the SCSI spec, and raised ATN while SEL
1632 * was true but before BSY was false during selection, the information
1633 * transfer phase should be a MESSAGE OUT phase so that we can send the
1634 * IDENTIFY message.
1635 *
1636 * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG
1637 * message (2 bytes) with a tag ID that we increment with every command
1638 * until it wraps back to 0.
1639 *
1640 * XXX - it turns out that there are some broken SCSI-II devices,
1641 * which claim to support tagged queuing but fail when more than
1642 * some number of commands are issued at once.
1643 */
1644
1645 /* Wait for start of REQ/ACK handshake */
1646 while (!(NCR5380_read(STATUS_REG) & SR_REQ))
1647 ;
1648
Finn Thaind65e6342014-03-18 11:42:20 +11001649 dprintk(NDEBUG_SELECTION, "scsi%d: target %d selected, going into MESSAGE OUT phase.\n",
Roman Zippelc28bda22007-05-01 22:32:36 +02001650 HOSTNO, cmd->device->id);
1651 tmp[0] = IDENTIFY(1, cmd->device->lun);
1652
1653#ifdef SUPPORT_TAGS
1654 if (cmd->tag != TAG_NONE) {
1655 tmp[1] = hostdata->last_message = SIMPLE_QUEUE_TAG;
1656 tmp[2] = cmd->tag;
1657 len = 3;
1658 } else
1659 len = 1;
1660#else
1661 len = 1;
1662 cmd->tag = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001663#endif /* SUPPORT_TAGS */
1664
Roman Zippelc28bda22007-05-01 22:32:36 +02001665 /* Send message(s) */
1666 data = tmp;
1667 phase = PHASE_MSGOUT;
1668 NCR5380_transfer_pio(instance, &phase, &len, &data);
Finn Thaind65e6342014-03-18 11:42:20 +11001669 dprintk(NDEBUG_SELECTION, "scsi%d: nexus established.\n", HOSTNO);
Roman Zippelc28bda22007-05-01 22:32:36 +02001670 /* XXX need to handle errors here */
1671 hostdata->connected = cmd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001672#ifndef SUPPORT_TAGS
Roman Zippelc28bda22007-05-01 22:32:36 +02001673 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
1674#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001675
Roman Zippelc28bda22007-05-01 22:32:36 +02001676 initialize_SCp(cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001677
Roman Zippelc28bda22007-05-01 22:32:36 +02001678 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001679}
1680
Roman Zippelc28bda22007-05-01 22:32:36 +02001681/*
1682 * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001683 * unsigned char *phase, int *count, unsigned char **data)
1684 *
1685 * Purpose : transfers data in given phase using polled I/O
1686 *
Roman Zippelc28bda22007-05-01 22:32:36 +02001687 * Inputs : instance - instance of driver, *phase - pointer to
1688 * what phase is expected, *count - pointer to number of
Linus Torvalds1da177e2005-04-16 15:20:36 -07001689 * bytes to transfer, **data - pointer to data pointer.
Roman Zippelc28bda22007-05-01 22:32:36 +02001690 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001691 * Returns : -1 when different phase is entered without transferring
Lucas De Marchi25985ed2011-03-30 22:57:33 -03001692 * maximum number of bytes, 0 if all bytes are transferred or exit
Linus Torvalds1da177e2005-04-16 15:20:36 -07001693 * is in same phase.
1694 *
Roman Zippelc28bda22007-05-01 22:32:36 +02001695 * Also, *phase, *count, *data are modified in place.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001696 *
1697 * XXX Note : handling for bus free may be useful.
1698 */
1699
1700/*
Roman Zippelc28bda22007-05-01 22:32:36 +02001701 * Note : this code is not as quick as it could be, however it
Linus Torvalds1da177e2005-04-16 15:20:36 -07001702 * IS 100% reliable, and for the actual data transfer where speed
1703 * counts, we will always do a pseudo DMA or DMA transfer.
1704 */
1705
Roman Zippelc28bda22007-05-01 22:32:36 +02001706static int NCR5380_transfer_pio(struct Scsi_Host *instance,
1707 unsigned char *phase, int *count,
1708 unsigned char **data)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001709{
Roman Zippelc28bda22007-05-01 22:32:36 +02001710 register unsigned char p = *phase, tmp;
1711 register int c = *count;
1712 register unsigned char *d = *data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001713
Roman Zippelc28bda22007-05-01 22:32:36 +02001714 /*
1715 * The NCR5380 chip will only drive the SCSI bus when the
1716 * phase specified in the appropriate bits of the TARGET COMMAND
1717 * REGISTER match the STATUS REGISTER
Linus Torvalds1da177e2005-04-16 15:20:36 -07001718 */
1719
Roman Zippelc28bda22007-05-01 22:32:36 +02001720 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001721
Roman Zippelc28bda22007-05-01 22:32:36 +02001722 do {
1723 /*
1724 * Wait for assertion of REQ, after which the phase bits will be
1725 * valid
1726 */
1727 while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ))
1728 ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001729
Finn Thaind65e6342014-03-18 11:42:20 +11001730 dprintk(NDEBUG_HANDSHAKE, "scsi%d: REQ detected\n", HOSTNO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001731
Roman Zippelc28bda22007-05-01 22:32:36 +02001732 /* Check for phase mismatch */
1733 if ((tmp & PHASE_MASK) != p) {
Finn Thaind65e6342014-03-18 11:42:20 +11001734 dprintk(NDEBUG_PIO, "scsi%d: phase mismatch\n", HOSTNO);
Finn Thain8ad3a592014-03-18 11:42:19 +11001735 NCR5380_dprint_phase(NDEBUG_PIO, instance);
Roman Zippelc28bda22007-05-01 22:32:36 +02001736 break;
1737 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001738
Roman Zippelc28bda22007-05-01 22:32:36 +02001739 /* Do actual transfer from SCSI bus to / from memory */
1740 if (!(p & SR_IO))
1741 NCR5380_write(OUTPUT_DATA_REG, *d);
1742 else
1743 *d = NCR5380_read(CURRENT_SCSI_DATA_REG);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001744
Roman Zippelc28bda22007-05-01 22:32:36 +02001745 ++d;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001746
Roman Zippelc28bda22007-05-01 22:32:36 +02001747 /*
1748 * The SCSI standard suggests that in MSGOUT phase, the initiator
1749 * should drop ATN on the last byte of the message phase
1750 * after REQ has been asserted for the handshake but before
1751 * the initiator raises ACK.
1752 */
1753
1754 if (!(p & SR_IO)) {
1755 if (!((p & SR_MSG) && c > 1)) {
1756 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA);
Finn Thain8ad3a592014-03-18 11:42:19 +11001757 NCR5380_dprint(NDEBUG_PIO, instance);
Roman Zippelc28bda22007-05-01 22:32:36 +02001758 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1759 ICR_ASSERT_DATA | ICR_ASSERT_ACK);
1760 } else {
1761 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1762 ICR_ASSERT_DATA | ICR_ASSERT_ATN);
Finn Thain8ad3a592014-03-18 11:42:19 +11001763 NCR5380_dprint(NDEBUG_PIO, instance);
Roman Zippelc28bda22007-05-01 22:32:36 +02001764 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1765 ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
1766 }
1767 } else {
Finn Thain8ad3a592014-03-18 11:42:19 +11001768 NCR5380_dprint(NDEBUG_PIO, instance);
Roman Zippelc28bda22007-05-01 22:32:36 +02001769 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK);
1770 }
1771
1772 while (NCR5380_read(STATUS_REG) & SR_REQ)
1773 ;
1774
Finn Thaind65e6342014-03-18 11:42:20 +11001775 dprintk(NDEBUG_HANDSHAKE, "scsi%d: req false, handshake complete\n", HOSTNO);
Roman Zippelc28bda22007-05-01 22:32:36 +02001776
1777 /*
1778 * We have several special cases to consider during REQ/ACK handshaking :
1779 * 1. We were in MSGOUT phase, and we are on the last byte of the
1780 * message. ATN must be dropped as ACK is dropped.
1781 *
1782 * 2. We are in a MSGIN phase, and we are on the last byte of the
1783 * message. We must exit with ACK asserted, so that the calling
1784 * code may raise ATN before dropping ACK to reject the message.
1785 *
1786 * 3. ACK and ATN are clear and the target may proceed as normal.
1787 */
1788 if (!(p == PHASE_MSGIN && c == 1)) {
1789 if (p == PHASE_MSGOUT && c > 1)
1790 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1791 else
1792 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1793 }
1794 } while (--c);
1795
Finn Thaind65e6342014-03-18 11:42:20 +11001796 dprintk(NDEBUG_PIO, "scsi%d: residual %d\n", HOSTNO, c);
Roman Zippelc28bda22007-05-01 22:32:36 +02001797
1798 *count = c;
1799 *data = d;
1800 tmp = NCR5380_read(STATUS_REG);
1801 /* The phase read from the bus is valid if either REQ is (already)
1802 * asserted or if ACK hasn't been released yet. The latter is the case if
1803 * we're in MSGIN and all wanted bytes have been received.
1804 */
1805 if ((tmp & SR_REQ) || (p == PHASE_MSGIN && c == 0))
1806 *phase = tmp & PHASE_MASK;
1807 else
1808 *phase = PHASE_UNKNOWN;
1809
1810 if (!c || (*phase == p))
1811 return 0;
1812 else
1813 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001814}
1815
1816/*
1817 * Function : do_abort (Scsi_Host *host)
Roman Zippelc28bda22007-05-01 22:32:36 +02001818 *
1819 * Purpose : abort the currently established nexus. Should only be
1820 * called from a routine which can drop into a
1821 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001822 * Returns : 0 on success, -1 on failure.
1823 */
1824
Roman Zippelc28bda22007-05-01 22:32:36 +02001825static int do_abort(struct Scsi_Host *host)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001826{
Roman Zippelc28bda22007-05-01 22:32:36 +02001827 unsigned char tmp, *msgptr, phase;
1828 int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001829
Roman Zippelc28bda22007-05-01 22:32:36 +02001830 /* Request message out phase */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001831 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001832
Roman Zippelc28bda22007-05-01 22:32:36 +02001833 /*
1834 * Wait for the target to indicate a valid phase by asserting
1835 * REQ. Once this happens, we'll have either a MSGOUT phase
1836 * and can immediately send the ABORT message, or we'll have some
1837 * other phase and will have to source/sink data.
1838 *
1839 * We really don't care what value was on the bus or what value
1840 * the target sees, so we just handshake.
1841 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001842
Roel Kluin3be38e72007-11-15 21:13:46 +01001843 while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ))
Roman Zippelc28bda22007-05-01 22:32:36 +02001844 ;
1845
1846 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
1847
1848 if ((tmp & PHASE_MASK) != PHASE_MSGOUT) {
1849 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN |
1850 ICR_ASSERT_ACK);
1851 while (NCR5380_read(STATUS_REG) & SR_REQ)
1852 ;
1853 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1854 }
1855
1856 tmp = ABORT;
1857 msgptr = &tmp;
1858 len = 1;
1859 phase = PHASE_MSGOUT;
1860 NCR5380_transfer_pio(host, &phase, &len, &msgptr);
1861
1862 /*
1863 * If we got here, and the command completed successfully,
1864 * we're about to go into bus free state.
1865 */
1866
1867 return len ? -1 : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001868}
1869
1870#if defined(REAL_DMA)
Roman Zippelc28bda22007-05-01 22:32:36 +02001871/*
1872 * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001873 * unsigned char *phase, int *count, unsigned char **data)
1874 *
1875 * Purpose : transfers data in given phase using either real
1876 * or pseudo DMA.
1877 *
Roman Zippelc28bda22007-05-01 22:32:36 +02001878 * Inputs : instance - instance of driver, *phase - pointer to
1879 * what phase is expected, *count - pointer to number of
Linus Torvalds1da177e2005-04-16 15:20:36 -07001880 * bytes to transfer, **data - pointer to data pointer.
Roman Zippelc28bda22007-05-01 22:32:36 +02001881 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001882 * Returns : -1 when different phase is entered without transferring
Lucas De Marchi25985ed2011-03-30 22:57:33 -03001883 * maximum number of bytes, 0 if all bytes or transferred or exit
Linus Torvalds1da177e2005-04-16 15:20:36 -07001884 * is in same phase.
1885 *
Roman Zippelc28bda22007-05-01 22:32:36 +02001886 * Also, *phase, *count, *data are modified in place.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001887 *
1888 */
1889
1890
Roman Zippelc28bda22007-05-01 22:32:36 +02001891static int NCR5380_transfer_dma(struct Scsi_Host *instance,
1892 unsigned char *phase, int *count,
1893 unsigned char **data)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001894{
Roman Zippelc28bda22007-05-01 22:32:36 +02001895 SETUP_HOSTDATA(instance);
1896 register int c = *count;
1897 register unsigned char p = *phase;
1898 register unsigned char *d = *data;
1899 unsigned char tmp;
1900 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001901
Roman Zippelc28bda22007-05-01 22:32:36 +02001902 if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) {
1903 *phase = tmp;
1904 return -1;
1905 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001906
Roman Zippelc28bda22007-05-01 22:32:36 +02001907 if (atari_read_overruns && (p & SR_IO))
1908 c -= atari_read_overruns;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001909
Finn Thaind65e6342014-03-18 11:42:20 +11001910 dprintk(NDEBUG_DMA, "scsi%d: initializing DMA for %s, %d bytes %s %p\n",
Roman Zippelc28bda22007-05-01 22:32:36 +02001911 HOSTNO, (p & SR_IO) ? "reading" : "writing",
1912 c, (p & SR_IO) ? "to" : "from", d);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001913
Roman Zippelc28bda22007-05-01 22:32:36 +02001914 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001915
1916#ifdef REAL_DMA
Roman Zippelc28bda22007-05-01 22:32:36 +02001917 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_ENABLE_EOP_INTR | MR_MONITOR_BSY);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001918#endif /* def REAL_DMA */
1919
Roman Zippelc28bda22007-05-01 22:32:36 +02001920 if (IS_A_TT()) {
1921 /* On the Medusa, it is a must to initialize the DMA before
1922 * starting the NCR. This is also the cleaner way for the TT.
1923 */
1924 local_irq_save(flags);
1925 hostdata->dma_len = (p & SR_IO) ?
1926 NCR5380_dma_read_setup(instance, d, c) :
1927 NCR5380_dma_write_setup(instance, d, c);
1928 local_irq_restore(flags);
1929 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001930
Roman Zippelc28bda22007-05-01 22:32:36 +02001931 if (p & SR_IO)
1932 NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0);
1933 else {
1934 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA);
1935 NCR5380_write(START_DMA_SEND_REG, 0);
1936 }
1937
1938 if (!IS_A_TT()) {
1939 /* On the Falcon, the DMA setup must be done after the last */
1940 /* NCR access, else the DMA setup gets trashed!
1941 */
1942 local_irq_save(flags);
1943 hostdata->dma_len = (p & SR_IO) ?
1944 NCR5380_dma_read_setup(instance, d, c) :
1945 NCR5380_dma_write_setup(instance, d, c);
1946 local_irq_restore(flags);
1947 }
1948 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001949}
1950#endif /* defined(REAL_DMA) */
1951
1952/*
1953 * Function : NCR5380_information_transfer (struct Scsi_Host *instance)
1954 *
Roman Zippelc28bda22007-05-01 22:32:36 +02001955 * Purpose : run through the various SCSI phases and do as the target
1956 * directs us to. Operates on the currently connected command,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001957 * instance->connected.
1958 *
1959 * Inputs : instance, instance for which we are doing commands
1960 *
Roman Zippelc28bda22007-05-01 22:32:36 +02001961 * Side effects : SCSI things happen, the disconnected queue will be
Linus Torvalds1da177e2005-04-16 15:20:36 -07001962 * modified if a command disconnects, *instance->connected will
1963 * change.
1964 *
Roman Zippelc28bda22007-05-01 22:32:36 +02001965 * XXX Note : we need to watch for bus free or a reset condition here
1966 * to recover from an unexpected bus free condition.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001967 */
Roman Zippelc28bda22007-05-01 22:32:36 +02001968
1969static void NCR5380_information_transfer(struct Scsi_Host *instance)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001970{
Roman Zippelc28bda22007-05-01 22:32:36 +02001971 SETUP_HOSTDATA(instance);
1972 unsigned long flags;
1973 unsigned char msgout = NOP;
1974 int sink = 0;
1975 int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001976#if defined(REAL_DMA)
Roman Zippelc28bda22007-05-01 22:32:36 +02001977 int transfersize;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001978#endif
Roman Zippelc28bda22007-05-01 22:32:36 +02001979 unsigned char *data;
1980 unsigned char phase, tmp, extended_msg[10], old_phase = 0xff;
1981 Scsi_Cmnd *cmd = (Scsi_Cmnd *) hostdata->connected;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001982
Roman Zippelc28bda22007-05-01 22:32:36 +02001983 while (1) {
1984 tmp = NCR5380_read(STATUS_REG);
1985 /* We only have a valid SCSI phase when REQ is asserted */
1986 if (tmp & SR_REQ) {
1987 phase = (tmp & PHASE_MASK);
1988 if (phase != old_phase) {
1989 old_phase = phase;
Finn Thain8ad3a592014-03-18 11:42:19 +11001990 NCR5380_dprint_phase(NDEBUG_INFORMATION, instance);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001991 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001992
Roman Zippelc28bda22007-05-01 22:32:36 +02001993 if (sink && (phase != PHASE_MSGOUT)) {
1994 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001995
Roman Zippelc28bda22007-05-01 22:32:36 +02001996 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN |
1997 ICR_ASSERT_ACK);
1998 while (NCR5380_read(STATUS_REG) & SR_REQ)
1999 ;
2000 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
2001 ICR_ASSERT_ATN);
2002 sink = 0;
2003 continue;
2004 }
2005
2006 switch (phase) {
2007 case PHASE_DATAOUT:
2008#if (NDEBUG & NDEBUG_NO_DATAOUT)
2009 printk("scsi%d: NDEBUG_NO_DATAOUT set, attempted DATAOUT "
2010 "aborted\n", HOSTNO);
2011 sink = 1;
2012 do_abort(instance);
2013 cmd->result = DID_ERROR << 16;
Matthew Wilcoxcce99c62007-09-25 12:42:01 -04002014 cmd->scsi_done(cmd);
Roman Zippelc28bda22007-05-01 22:32:36 +02002015 return;
2016#endif
2017 case PHASE_DATAIN:
2018 /*
2019 * If there is no room left in the current buffer in the
2020 * scatter-gather list, move onto the next one.
2021 */
2022
2023 if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
2024 ++cmd->SCp.buffer;
2025 --cmd->SCp.buffers_residual;
2026 cmd->SCp.this_residual = cmd->SCp.buffer->length;
Jens Axboe45711f12007-10-22 21:19:53 +02002027 cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
Roman Zippelc28bda22007-05-01 22:32:36 +02002028 /* ++roman: Try to merge some scatter-buffers if
2029 * they are at contiguous physical addresses.
2030 */
2031 merge_contiguous_buffers(cmd);
Finn Thaind65e6342014-03-18 11:42:20 +11002032 dprintk(NDEBUG_INFORMATION, "scsi%d: %d bytes and %d buffers left\n",
Roman Zippelc28bda22007-05-01 22:32:36 +02002033 HOSTNO, cmd->SCp.this_residual,
2034 cmd->SCp.buffers_residual);
2035 }
2036
2037 /*
2038 * The preferred transfer method is going to be
2039 * PSEUDO-DMA for systems that are strictly PIO,
2040 * since we can let the hardware do the handshaking.
2041 *
2042 * For this to work, we need to know the transfersize
2043 * ahead of time, since the pseudo-DMA code will sit
2044 * in an unconditional loop.
2045 */
2046
2047 /* ++roman: I suggest, this should be
2048 * #if def(REAL_DMA)
2049 * instead of leaving REAL_DMA out.
2050 */
2051
2052#if defined(REAL_DMA)
2053 if (!cmd->device->borken &&
2054 (transfersize = NCR5380_dma_xfer_len(instance,cmd,phase)) > 31) {
2055 len = transfersize;
2056 cmd->SCp.phase = phase;
2057 if (NCR5380_transfer_dma(instance, &phase,
2058 &len, (unsigned char **)&cmd->SCp.ptr)) {
2059 /*
2060 * If the watchdog timer fires, all future
2061 * accesses to this device will use the
2062 * polled-IO. */
2063 printk(KERN_NOTICE "scsi%d: switching target %d "
2064 "lun %d to slow handshake\n", HOSTNO,
2065 cmd->device->id, cmd->device->lun);
2066 cmd->device->borken = 1;
2067 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
2068 ICR_ASSERT_ATN);
2069 sink = 1;
2070 do_abort(instance);
2071 cmd->result = DID_ERROR << 16;
Matthew Wilcoxcce99c62007-09-25 12:42:01 -04002072 cmd->scsi_done(cmd);
Roman Zippelc28bda22007-05-01 22:32:36 +02002073 /* XXX - need to source or sink data here, as appropriate */
2074 } else {
2075#ifdef REAL_DMA
2076 /* ++roman: When using real DMA,
2077 * information_transfer() should return after
2078 * starting DMA since it has nothing more to
2079 * do.
2080 */
2081 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002082#else
Roman Zippelc28bda22007-05-01 22:32:36 +02002083 cmd->SCp.this_residual -= transfersize - len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002084#endif
Roman Zippelc28bda22007-05-01 22:32:36 +02002085 }
2086 } else
2087#endif /* defined(REAL_DMA) */
2088 NCR5380_transfer_pio(instance, &phase,
2089 (int *)&cmd->SCp.this_residual,
2090 (unsigned char **)&cmd->SCp.ptr);
2091 break;
2092 case PHASE_MSGIN:
2093 len = 1;
2094 data = &tmp;
2095 NCR5380_write(SELECT_ENABLE_REG, 0); /* disable reselects */
2096 NCR5380_transfer_pio(instance, &phase, &len, &data);
2097 cmd->SCp.Message = tmp;
2098
2099 switch (tmp) {
2100 /*
2101 * Linking lets us reduce the time required to get the
2102 * next command out to the device, hopefully this will
2103 * mean we don't waste another revolution due to the delays
2104 * required by ARBITRATION and another SELECTION.
2105 *
2106 * In the current implementation proposal, low level drivers
2107 * merely have to start the next command, pointed to by
2108 * next_link, done() is called as with unlinked commands.
2109 */
2110#ifdef LINKED
2111 case LINKED_CMD_COMPLETE:
2112 case LINKED_FLG_CMD_COMPLETE:
2113 /* Accept message by clearing ACK */
2114 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2115
Finn Thaind65e6342014-03-18 11:42:20 +11002116 dprintk(NDEBUG_LINKED, "scsi%d: target %d lun %d linked command "
Roman Zippelc28bda22007-05-01 22:32:36 +02002117 "complete.\n", HOSTNO, cmd->device->id, cmd->device->lun);
2118
2119 /* Enable reselect interrupts */
2120 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2121 /*
2122 * Sanity check : A linked command should only terminate
2123 * with one of these messages if there are more linked
2124 * commands available.
2125 */
2126
2127 if (!cmd->next_link) {
2128 printk(KERN_NOTICE "scsi%d: target %d lun %d "
2129 "linked command complete, no next_link\n",
2130 HOSTNO, cmd->device->id, cmd->device->lun);
2131 sink = 1;
2132 do_abort(instance);
2133 return;
2134 }
2135
2136 initialize_SCp(cmd->next_link);
2137 /* The next command is still part of this process; copy it
2138 * and don't free it! */
2139 cmd->next_link->tag = cmd->tag;
2140 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
Finn Thaind65e6342014-03-18 11:42:20 +11002141 dprintk(NDEBUG_LINKED, "scsi%d: target %d lun %d linked request "
Roman Zippelc28bda22007-05-01 22:32:36 +02002142 "done, calling scsi_done().\n",
2143 HOSTNO, cmd->device->id, cmd->device->lun);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002144#ifdef NCR5380_STATS
Roman Zippelc28bda22007-05-01 22:32:36 +02002145 collect_stats(hostdata, cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002146#endif
Roman Zippelc28bda22007-05-01 22:32:36 +02002147 cmd->scsi_done(cmd);
2148 cmd = hostdata->connected;
2149 break;
2150#endif /* def LINKED */
2151 case ABORT:
2152 case COMMAND_COMPLETE:
2153 /* Accept message by clearing ACK */
2154 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2155 /* ++guenther: possible race with Falcon locking */
2156 falcon_dont_release++;
2157 hostdata->connected = NULL;
Finn Thaind65e6342014-03-18 11:42:20 +11002158 dprintk(NDEBUG_QUEUES, "scsi%d: command for target %d, lun %d "
Roman Zippelc28bda22007-05-01 22:32:36 +02002159 "completed\n", HOSTNO, cmd->device->id, cmd->device->lun);
2160#ifdef SUPPORT_TAGS
2161 cmd_free_tag(cmd);
2162 if (status_byte(cmd->SCp.Status) == QUEUE_FULL) {
2163 /* Turn a QUEUE FULL status into BUSY, I think the
2164 * mid level cannot handle QUEUE FULL :-( (The
2165 * command is retried after BUSY). Also update our
2166 * queue size to the number of currently issued
2167 * commands now.
2168 */
2169 /* ++Andreas: the mid level code knows about
2170 QUEUE_FULL now. */
2171 TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun];
Finn Thaind65e6342014-03-18 11:42:20 +11002172 dprintk(NDEBUG_TAGS, "scsi%d: target %d lun %d returned "
Roman Zippelc28bda22007-05-01 22:32:36 +02002173 "QUEUE_FULL after %d commands\n",
2174 HOSTNO, cmd->device->id, cmd->device->lun,
2175 ta->nr_allocated);
2176 if (ta->queue_size > ta->nr_allocated)
2177 ta->nr_allocated = ta->queue_size;
2178 }
2179#else
2180 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2181#endif
2182 /* Enable reselect interrupts */
2183 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2184
2185 /*
2186 * I'm not sure what the correct thing to do here is :
2187 *
2188 * If the command that just executed is NOT a request
2189 * sense, the obvious thing to do is to set the result
2190 * code to the values of the stored parameters.
2191 *
2192 * If it was a REQUEST SENSE command, we need some way to
2193 * differentiate between the failure code of the original
2194 * and the failure code of the REQUEST sense - the obvious
2195 * case is success, where we fall through and leave the
2196 * result code unchanged.
2197 *
2198 * The non-obvious place is where the REQUEST SENSE failed
2199 */
2200
2201 if (cmd->cmnd[0] != REQUEST_SENSE)
2202 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
2203 else if (status_byte(cmd->SCp.Status) != GOOD)
2204 cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16);
2205
2206#ifdef AUTOSENSE
Boaz Harrosh28424d32007-09-10 22:37:45 +03002207 if ((cmd->cmnd[0] == REQUEST_SENSE) &&
2208 hostdata->ses.cmd_len) {
2209 scsi_eh_restore_cmnd(cmd, &hostdata->ses);
2210 hostdata->ses.cmd_len = 0 ;
2211 }
2212
Roman Zippelc28bda22007-05-01 22:32:36 +02002213 if ((cmd->cmnd[0] != REQUEST_SENSE) &&
2214 (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) {
Boaz Harrosh28424d32007-09-10 22:37:45 +03002215 scsi_eh_prep_cmnd(cmd, &hostdata->ses, NULL, 0, ~0);
Roman Zippelc28bda22007-05-01 22:32:36 +02002216
Finn Thaind65e6342014-03-18 11:42:20 +11002217 dprintk(NDEBUG_AUTOSENSE, "scsi%d: performing request sense\n", HOSTNO);
Roman Zippelc28bda22007-05-01 22:32:36 +02002218
2219 local_irq_save(flags);
2220 LIST(cmd,hostdata->issue_queue);
Roman Zippel3130d902007-05-01 22:32:37 +02002221 SET_NEXT(cmd, hostdata->issue_queue);
Roman Zippelc28bda22007-05-01 22:32:36 +02002222 hostdata->issue_queue = (Scsi_Cmnd *) cmd;
2223 local_irq_restore(flags);
Finn Thaind65e6342014-03-18 11:42:20 +11002224 dprintk(NDEBUG_QUEUES, "scsi%d: REQUEST SENSE added to head of "
Roman Zippelc28bda22007-05-01 22:32:36 +02002225 "issue queue\n", H_NO(cmd));
2226 } else
2227#endif /* def AUTOSENSE */
2228 {
2229#ifdef NCR5380_STATS
2230 collect_stats(hostdata, cmd);
2231#endif
2232 cmd->scsi_done(cmd);
2233 }
2234
2235 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2236 /*
2237 * Restore phase bits to 0 so an interrupted selection,
2238 * arbitration can resume.
2239 */
2240 NCR5380_write(TARGET_COMMAND_REG, 0);
2241
2242 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
2243 barrier();
2244
2245 falcon_dont_release--;
2246 /* ++roman: For Falcon SCSI, release the lock on the
2247 * ST-DMA here if no other commands are waiting on the
2248 * disconnected queue.
2249 */
2250 falcon_release_lock_if_possible(hostdata);
2251 return;
2252 case MESSAGE_REJECT:
2253 /* Accept message by clearing ACK */
2254 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2255 /* Enable reselect interrupts */
2256 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2257 switch (hostdata->last_message) {
2258 case HEAD_OF_QUEUE_TAG:
2259 case ORDERED_QUEUE_TAG:
2260 case SIMPLE_QUEUE_TAG:
2261 /* The target obviously doesn't support tagged
2262 * queuing, even though it announced this ability in
2263 * its INQUIRY data ?!? (maybe only this LUN?) Ok,
2264 * clear 'tagged_supported' and lock the LUN, since
2265 * the command is treated as untagged further on.
2266 */
2267 cmd->device->tagged_supported = 0;
2268 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
2269 cmd->tag = TAG_NONE;
Finn Thaind65e6342014-03-18 11:42:20 +11002270 dprintk(NDEBUG_TAGS, "scsi%d: target %d lun %d rejected "
Roman Zippelc28bda22007-05-01 22:32:36 +02002271 "QUEUE_TAG message; tagged queuing "
2272 "disabled\n",
2273 HOSTNO, cmd->device->id, cmd->device->lun);
2274 break;
2275 }
2276 break;
2277 case DISCONNECT:
2278 /* Accept message by clearing ACK */
2279 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2280 local_irq_save(flags);
2281 cmd->device->disconnect = 1;
2282 LIST(cmd,hostdata->disconnected_queue);
Roman Zippel3130d902007-05-01 22:32:37 +02002283 SET_NEXT(cmd, hostdata->disconnected_queue);
Roman Zippelc28bda22007-05-01 22:32:36 +02002284 hostdata->connected = NULL;
2285 hostdata->disconnected_queue = cmd;
2286 local_irq_restore(flags);
Finn Thaind65e6342014-03-18 11:42:20 +11002287 dprintk(NDEBUG_QUEUES, "scsi%d: command for target %d lun %d was "
Roman Zippelc28bda22007-05-01 22:32:36 +02002288 "moved from connected to the "
2289 "disconnected_queue\n", HOSTNO,
2290 cmd->device->id, cmd->device->lun);
2291 /*
2292 * Restore phase bits to 0 so an interrupted selection,
2293 * arbitration can resume.
2294 */
2295 NCR5380_write(TARGET_COMMAND_REG, 0);
2296
2297 /* Enable reselect interrupts */
2298 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2299 /* Wait for bus free to avoid nasty timeouts */
2300 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
2301 barrier();
2302 return;
2303 /*
2304 * The SCSI data pointer is *IMPLICITLY* saved on a disconnect
2305 * operation, in violation of the SCSI spec so we can safely
2306 * ignore SAVE/RESTORE pointers calls.
2307 *
2308 * Unfortunately, some disks violate the SCSI spec and
2309 * don't issue the required SAVE_POINTERS message before
2310 * disconnecting, and we have to break spec to remain
2311 * compatible.
2312 */
2313 case SAVE_POINTERS:
2314 case RESTORE_POINTERS:
2315 /* Accept message by clearing ACK */
2316 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2317 /* Enable reselect interrupts */
2318 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2319 break;
2320 case EXTENDED_MESSAGE:
2321 /*
2322 * Extended messages are sent in the following format :
2323 * Byte
2324 * 0 EXTENDED_MESSAGE == 1
2325 * 1 length (includes one byte for code, doesn't
2326 * include first two bytes)
2327 * 2 code
2328 * 3..length+1 arguments
2329 *
2330 * Start the extended message buffer with the EXTENDED_MESSAGE
2331 * byte, since spi_print_msg() wants the whole thing.
2332 */
2333 extended_msg[0] = EXTENDED_MESSAGE;
2334 /* Accept first byte by clearing ACK */
2335 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2336
Finn Thaind65e6342014-03-18 11:42:20 +11002337 dprintk(NDEBUG_EXTENDED, "scsi%d: receiving extended message\n", HOSTNO);
Roman Zippelc28bda22007-05-01 22:32:36 +02002338
2339 len = 2;
2340 data = extended_msg + 1;
2341 phase = PHASE_MSGIN;
2342 NCR5380_transfer_pio(instance, &phase, &len, &data);
Finn Thaind65e6342014-03-18 11:42:20 +11002343 dprintk(NDEBUG_EXTENDED, "scsi%d: length=%d, code=0x%02x\n", HOSTNO,
Roman Zippelc28bda22007-05-01 22:32:36 +02002344 (int)extended_msg[1], (int)extended_msg[2]);
2345
2346 if (!len && extended_msg[1] <=
2347 (sizeof(extended_msg) - 1)) {
2348 /* Accept third byte by clearing ACK */
2349 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2350 len = extended_msg[1] - 1;
2351 data = extended_msg + 3;
2352 phase = PHASE_MSGIN;
2353
2354 NCR5380_transfer_pio(instance, &phase, &len, &data);
Finn Thaind65e6342014-03-18 11:42:20 +11002355 dprintk(NDEBUG_EXTENDED, "scsi%d: message received, residual %d\n",
Roman Zippelc28bda22007-05-01 22:32:36 +02002356 HOSTNO, len);
2357
2358 switch (extended_msg[2]) {
2359 case EXTENDED_SDTR:
2360 case EXTENDED_WDTR:
2361 case EXTENDED_MODIFY_DATA_POINTER:
2362 case EXTENDED_EXTENDED_IDENTIFY:
2363 tmp = 0;
2364 }
2365 } else if (len) {
2366 printk(KERN_NOTICE "scsi%d: error receiving "
2367 "extended message\n", HOSTNO);
2368 tmp = 0;
2369 } else {
2370 printk(KERN_NOTICE "scsi%d: extended message "
2371 "code %02x length %d is too long\n",
2372 HOSTNO, extended_msg[2], extended_msg[1]);
2373 tmp = 0;
2374 }
2375 /* Fall through to reject message */
2376
2377 /*
2378 * If we get something weird that we aren't expecting,
2379 * reject it.
2380 */
2381 default:
2382 if (!tmp) {
2383 printk(KERN_DEBUG "scsi%d: rejecting message ", HOSTNO);
2384 spi_print_msg(extended_msg);
2385 printk("\n");
2386 } else if (tmp != EXTENDED_MESSAGE)
2387 printk(KERN_DEBUG "scsi%d: rejecting unknown "
2388 "message %02x from target %d, lun %d\n",
2389 HOSTNO, tmp, cmd->device->id, cmd->device->lun);
2390 else
2391 printk(KERN_DEBUG "scsi%d: rejecting unknown "
2392 "extended message "
2393 "code %02x, length %d from target %d, lun %d\n",
2394 HOSTNO, extended_msg[1], extended_msg[0],
2395 cmd->device->id, cmd->device->lun);
2396
2397
2398 msgout = MESSAGE_REJECT;
2399 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
2400 break;
2401 } /* switch (tmp) */
2402 break;
2403 case PHASE_MSGOUT:
2404 len = 1;
2405 data = &msgout;
2406 hostdata->last_message = msgout;
2407 NCR5380_transfer_pio(instance, &phase, &len, &data);
2408 if (msgout == ABORT) {
2409#ifdef SUPPORT_TAGS
2410 cmd_free_tag(cmd);
2411#else
2412 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2413#endif
2414 hostdata->connected = NULL;
2415 cmd->result = DID_ERROR << 16;
2416#ifdef NCR5380_STATS
2417 collect_stats(hostdata, cmd);
2418#endif
2419 cmd->scsi_done(cmd);
2420 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2421 falcon_release_lock_if_possible(hostdata);
2422 return;
2423 }
2424 msgout = NOP;
2425 break;
2426 case PHASE_CMDOUT:
2427 len = cmd->cmd_len;
2428 data = cmd->cmnd;
2429 /*
2430 * XXX for performance reasons, on machines with a
2431 * PSEUDO-DMA architecture we should probably
2432 * use the dma transfer function.
2433 */
2434 NCR5380_transfer_pio(instance, &phase, &len, &data);
2435 break;
2436 case PHASE_STATIN:
2437 len = 1;
2438 data = &tmp;
2439 NCR5380_transfer_pio(instance, &phase, &len, &data);
2440 cmd->SCp.Status = tmp;
2441 break;
2442 default:
2443 printk("scsi%d: unknown phase\n", HOSTNO);
Finn Thain8ad3a592014-03-18 11:42:19 +11002444 NCR5380_dprint(NDEBUG_ANY, instance);
Roman Zippelc28bda22007-05-01 22:32:36 +02002445 } /* switch(phase) */
2446 } /* if (tmp * SR_REQ) */
2447 } /* while (1) */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002448}
2449
2450/*
2451 * Function : void NCR5380_reselect (struct Scsi_Host *instance)
2452 *
Roman Zippelc28bda22007-05-01 22:32:36 +02002453 * Purpose : does reselection, initializing the instance->connected
2454 * 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 -07002455 * nexus has been reestablished,
Roman Zippelc28bda22007-05-01 22:32:36 +02002456 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002457 * Inputs : instance - this instance of the NCR5380.
2458 *
2459 */
2460
2461
Roman Zippelc28bda22007-05-01 22:32:36 +02002462static void NCR5380_reselect(struct Scsi_Host *instance)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002463{
Roman Zippelc28bda22007-05-01 22:32:36 +02002464 SETUP_HOSTDATA(instance);
2465 unsigned char target_mask;
2466 unsigned char lun, phase;
2467 int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002468#ifdef SUPPORT_TAGS
Roman Zippelc28bda22007-05-01 22:32:36 +02002469 unsigned char tag;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002470#endif
Roman Zippelc28bda22007-05-01 22:32:36 +02002471 unsigned char msg[3];
2472 unsigned char *data;
2473 Scsi_Cmnd *tmp = NULL, *prev;
2474/* unsigned long flags; */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002475
Roman Zippelc28bda22007-05-01 22:32:36 +02002476 /*
2477 * Disable arbitration, etc. since the host adapter obviously
2478 * lost, and tell an interrupted NCR5380_select() to restart.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002479 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002480
Roman Zippelc28bda22007-05-01 22:32:36 +02002481 NCR5380_write(MODE_REG, MR_BASE);
2482 hostdata->restart_select = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002483
Roman Zippelc28bda22007-05-01 22:32:36 +02002484 target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask);
2485
Finn Thaind65e6342014-03-18 11:42:20 +11002486 dprintk(NDEBUG_RESELECTION, "scsi%d: reselect\n", HOSTNO);
Roman Zippelc28bda22007-05-01 22:32:36 +02002487
2488 /*
2489 * At this point, we have detected that our SCSI ID is on the bus,
2490 * SEL is true and BSY was false for at least one bus settle delay
2491 * (400 ns).
2492 *
2493 * We must assert BSY ourselves, until the target drops the SEL
2494 * signal.
2495 */
2496
2497 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY);
2498
2499 while (NCR5380_read(STATUS_REG) & SR_SEL)
2500 ;
2501 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2502
2503 /*
2504 * Wait for target to go into MSGIN.
2505 */
2506
2507 while (!(NCR5380_read(STATUS_REG) & SR_REQ))
2508 ;
2509
2510 len = 1;
2511 data = msg;
2512 phase = PHASE_MSGIN;
2513 NCR5380_transfer_pio(instance, &phase, &len, &data);
2514
2515 if (!(msg[0] & 0x80)) {
2516 printk(KERN_DEBUG "scsi%d: expecting IDENTIFY message, got ", HOSTNO);
2517 spi_print_msg(msg);
2518 do_abort(instance);
2519 return;
2520 }
2521 lun = (msg[0] & 0x07);
2522
2523#ifdef SUPPORT_TAGS
2524 /* If the phase is still MSGIN, the target wants to send some more
2525 * messages. In case it supports tagged queuing, this is probably a
2526 * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus.
2527 */
2528 tag = TAG_NONE;
2529 if (phase == PHASE_MSGIN && setup_use_tagged_queuing) {
2530 /* Accept previous IDENTIFY message by clearing ACK */
2531 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2532 len = 2;
2533 data = msg + 1;
2534 if (!NCR5380_transfer_pio(instance, &phase, &len, &data) &&
2535 msg[1] == SIMPLE_QUEUE_TAG)
2536 tag = msg[2];
Finn Thaind65e6342014-03-18 11:42:20 +11002537 dprintk(NDEBUG_TAGS, "scsi%d: target mask %02x, lun %d sent tag %d at "
Roman Zippelc28bda22007-05-01 22:32:36 +02002538 "reselection\n", HOSTNO, target_mask, lun, tag);
2539 }
2540#endif
2541
2542 /*
2543 * Find the command corresponding to the I_T_L or I_T_L_Q nexus we
2544 * just reestablished, and remove it from the disconnected queue.
2545 */
2546
2547 for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue, prev = NULL;
2548 tmp; prev = tmp, tmp = NEXT(tmp)) {
2549 if ((target_mask == (1 << tmp->device->id)) && (lun == tmp->device->lun)
2550#ifdef SUPPORT_TAGS
2551 && (tag == tmp->tag)
2552#endif
2553 ) {
2554 /* ++guenther: prevent race with falcon_release_lock */
2555 falcon_dont_release++;
2556 if (prev) {
2557 REMOVE(prev, NEXT(prev), tmp, NEXT(tmp));
Roman Zippel3130d902007-05-01 22:32:37 +02002558 SET_NEXT(prev, NEXT(tmp));
Roman Zippelc28bda22007-05-01 22:32:36 +02002559 } else {
2560 REMOVE(-1, hostdata->disconnected_queue, tmp, NEXT(tmp));
2561 hostdata->disconnected_queue = NEXT(tmp);
2562 }
Roman Zippel3130d902007-05-01 22:32:37 +02002563 SET_NEXT(tmp, NULL);
Roman Zippelc28bda22007-05-01 22:32:36 +02002564 break;
2565 }
2566 }
2567
2568 if (!tmp) {
2569 printk(KERN_WARNING "scsi%d: warning: target bitmask %02x lun %d "
2570#ifdef SUPPORT_TAGS
2571 "tag %d "
2572#endif
2573 "not in disconnected_queue.\n",
2574 HOSTNO, target_mask, lun
2575#ifdef SUPPORT_TAGS
2576 , tag
2577#endif
2578 );
2579 /*
2580 * Since we have an established nexus that we can't do anything
2581 * with, we must abort it.
2582 */
2583 do_abort(instance);
2584 return;
2585 }
2586
2587 /* Accept message by clearing ACK */
2588 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2589
2590 hostdata->connected = tmp;
Finn Thaind65e6342014-03-18 11:42:20 +11002591 dprintk(NDEBUG_RESELECTION, "scsi%d: nexus established, target = %d, lun = %d, tag = %d\n",
Roman Zippelc28bda22007-05-01 22:32:36 +02002592 HOSTNO, tmp->device->id, tmp->device->lun, tmp->tag);
2593 falcon_dont_release--;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002594}
2595
2596
2597/*
2598 * Function : int NCR5380_abort (Scsi_Cmnd *cmd)
2599 *
2600 * Purpose : abort a command
2601 *
Roman Zippelc28bda22007-05-01 22:32:36 +02002602 * Inputs : cmd - the Scsi_Cmnd to abort, code - code to set the
2603 * host byte of the result field to, if zero DID_ABORTED is
Linus Torvalds1da177e2005-04-16 15:20:36 -07002604 * used.
2605 *
2606 * Returns : 0 - success, -1 on failure.
2607 *
Roman Zippelc28bda22007-05-01 22:32:36 +02002608 * XXX - there is no way to abort the command that is currently
2609 * connected, you have to wait for it to complete. If this is
Linus Torvalds1da177e2005-04-16 15:20:36 -07002610 * a problem, we could implement longjmp() / setjmp(), setjmp()
Roman Zippelc28bda22007-05-01 22:32:36 +02002611 * called where the loop started in NCR5380_main().
Linus Torvalds1da177e2005-04-16 15:20:36 -07002612 */
2613
2614static
Roman Zippelc28bda22007-05-01 22:32:36 +02002615int NCR5380_abort(Scsi_Cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002616{
Roman Zippelc28bda22007-05-01 22:32:36 +02002617 struct Scsi_Host *instance = cmd->device->host;
2618 SETUP_HOSTDATA(instance);
2619 Scsi_Cmnd *tmp, **prev;
2620 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002621
Roman Zippelc28bda22007-05-01 22:32:36 +02002622 printk(KERN_NOTICE "scsi%d: aborting command\n", HOSTNO);
2623 scsi_print_command(cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002624
Roman Zippelc28bda22007-05-01 22:32:36 +02002625 NCR5380_print_status(instance);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002626
Roman Zippelc28bda22007-05-01 22:32:36 +02002627 local_irq_save(flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002628
Roman Zippelc28bda22007-05-01 22:32:36 +02002629 if (!IS_A_TT() && !falcon_got_lock)
2630 printk(KERN_ERR "scsi%d: !!BINGO!! Falcon has no lock in NCR5380_abort\n",
2631 HOSTNO);
2632
Finn Thaind65e6342014-03-18 11:42:20 +11002633 dprintk(NDEBUG_ABORT, "scsi%d: abort called basr 0x%02x, sr 0x%02x\n", HOSTNO,
Roman Zippelc28bda22007-05-01 22:32:36 +02002634 NCR5380_read(BUS_AND_STATUS_REG),
2635 NCR5380_read(STATUS_REG));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002636
2637#if 1
Roman Zippelc28bda22007-05-01 22:32:36 +02002638 /*
2639 * Case 1 : If the command is the currently executing command,
2640 * we'll set the aborted flag and return control so that
2641 * information transfer routine can exit cleanly.
2642 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002643
Roman Zippelc28bda22007-05-01 22:32:36 +02002644 if (hostdata->connected == cmd) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002645
Finn Thaind65e6342014-03-18 11:42:20 +11002646 dprintk(NDEBUG_ABORT, "scsi%d: aborting connected command\n", HOSTNO);
Roman Zippelc28bda22007-05-01 22:32:36 +02002647 /*
2648 * We should perform BSY checking, and make sure we haven't slipped
2649 * into BUS FREE.
2650 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002651
Roman Zippelc28bda22007-05-01 22:32:36 +02002652 /* NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN); */
2653 /*
2654 * Since we can't change phases until we've completed the current
2655 * handshake, we have to source or sink a byte of data if the current
2656 * phase is not MSGOUT.
2657 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002658
Roman Zippelc28bda22007-05-01 22:32:36 +02002659 /*
2660 * Return control to the executing NCR drive so we can clear the
2661 * aborted flag and get back into our main loop.
2662 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002663
Roman Zippelc28bda22007-05-01 22:32:36 +02002664 if (do_abort(instance) == 0) {
2665 hostdata->aborted = 1;
2666 hostdata->connected = NULL;
2667 cmd->result = DID_ABORT << 16;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002668#ifdef SUPPORT_TAGS
Roman Zippelc28bda22007-05-01 22:32:36 +02002669 cmd_free_tag(cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002670#else
Roman Zippelc28bda22007-05-01 22:32:36 +02002671 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002672#endif
Roman Zippelc28bda22007-05-01 22:32:36 +02002673 local_irq_restore(flags);
2674 cmd->scsi_done(cmd);
2675 falcon_release_lock_if_possible(hostdata);
Michael Schmitz2b0f8342014-05-02 20:43:01 +12002676 return SUCCESS;
Roman Zippelc28bda22007-05-01 22:32:36 +02002677 } else {
2678/* local_irq_restore(flags); */
2679 printk("scsi%d: abort of connected command failed!\n", HOSTNO);
Michael Schmitz2b0f8342014-05-02 20:43:01 +12002680 return FAILED;
Roman Zippelc28bda22007-05-01 22:32:36 +02002681 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002682 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002683#endif
Roman Zippelc28bda22007-05-01 22:32:36 +02002684
2685 /*
2686 * Case 2 : If the command hasn't been issued yet, we simply remove it
2687 * from the issue queue.
2688 */
2689 for (prev = (Scsi_Cmnd **)&(hostdata->issue_queue),
2690 tmp = (Scsi_Cmnd *)hostdata->issue_queue;
2691 tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp)) {
2692 if (cmd == tmp) {
2693 REMOVE(5, *prev, tmp, NEXT(tmp));
2694 (*prev) = NEXT(tmp);
Roman Zippel3130d902007-05-01 22:32:37 +02002695 SET_NEXT(tmp, NULL);
Roman Zippelc28bda22007-05-01 22:32:36 +02002696 tmp->result = DID_ABORT << 16;
2697 local_irq_restore(flags);
Finn Thaind65e6342014-03-18 11:42:20 +11002698 dprintk(NDEBUG_ABORT, "scsi%d: abort removed command from issue queue.\n",
Roman Zippelc28bda22007-05-01 22:32:36 +02002699 HOSTNO);
2700 /* Tagged queuing note: no tag to free here, hasn't been assigned
2701 * yet... */
2702 tmp->scsi_done(tmp);
2703 falcon_release_lock_if_possible(hostdata);
Michael Schmitz2b0f8342014-05-02 20:43:01 +12002704 return SUCCESS;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002705 }
2706 }
2707
Roman Zippelc28bda22007-05-01 22:32:36 +02002708 /*
2709 * Case 3 : If any commands are connected, we're going to fail the abort
2710 * and let the high level SCSI driver retry at a later time or
2711 * issue a reset.
2712 *
2713 * Timeouts, and therefore aborted commands, will be highly unlikely
2714 * and handling them cleanly in this situation would make the common
2715 * case of noresets less efficient, and would pollute our code. So,
2716 * we fail.
2717 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002718
Roman Zippelc28bda22007-05-01 22:32:36 +02002719 if (hostdata->connected) {
2720 local_irq_restore(flags);
Finn Thaind65e6342014-03-18 11:42:20 +11002721 dprintk(NDEBUG_ABORT, "scsi%d: abort failed, command connected.\n", HOSTNO);
Michael Schmitz2b0f8342014-05-02 20:43:01 +12002722 return FAILED;
Roman Zippelc28bda22007-05-01 22:32:36 +02002723 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002724
Roman Zippelc28bda22007-05-01 22:32:36 +02002725 /*
2726 * Case 4: If the command is currently disconnected from the bus, and
2727 * there are no connected commands, we reconnect the I_T_L or
2728 * I_T_L_Q nexus associated with it, go into message out, and send
2729 * an abort message.
2730 *
2731 * This case is especially ugly. In order to reestablish the nexus, we
2732 * need to call NCR5380_select(). The easiest way to implement this
2733 * function was to abort if the bus was busy, and let the interrupt
2734 * handler triggered on the SEL for reselect take care of lost arbitrations
2735 * where necessary, meaning interrupts need to be enabled.
2736 *
2737 * When interrupts are enabled, the queues may change - so we
2738 * can't remove it from the disconnected queue before selecting it
2739 * because that could cause a failure in hashing the nexus if that
2740 * device reselected.
2741 *
2742 * Since the queues may change, we can't use the pointers from when we
2743 * first locate it.
2744 *
2745 * So, we must first locate the command, and if NCR5380_select()
2746 * succeeds, then issue the abort, relocate the command and remove
2747 * it from the disconnected queue.
2748 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002749
Roman Zippelc28bda22007-05-01 22:32:36 +02002750 for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue; tmp;
2751 tmp = NEXT(tmp)) {
2752 if (cmd == tmp) {
2753 local_irq_restore(flags);
Finn Thaind65e6342014-03-18 11:42:20 +11002754 dprintk(NDEBUG_ABORT, "scsi%d: aborting disconnected command.\n", HOSTNO);
Roman Zippelc28bda22007-05-01 22:32:36 +02002755
2756 if (NCR5380_select(instance, cmd, (int)cmd->tag))
Michael Schmitz2b0f8342014-05-02 20:43:01 +12002757 return FAILED;
Roman Zippelc28bda22007-05-01 22:32:36 +02002758
Finn Thaind65e6342014-03-18 11:42:20 +11002759 dprintk(NDEBUG_ABORT, "scsi%d: nexus reestablished.\n", HOSTNO);
Roman Zippelc28bda22007-05-01 22:32:36 +02002760
2761 do_abort(instance);
2762
2763 local_irq_save(flags);
2764 for (prev = (Scsi_Cmnd **)&(hostdata->disconnected_queue),
2765 tmp = (Scsi_Cmnd *)hostdata->disconnected_queue;
2766 tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp)) {
2767 if (cmd == tmp) {
2768 REMOVE(5, *prev, tmp, NEXT(tmp));
2769 *prev = NEXT(tmp);
Roman Zippel3130d902007-05-01 22:32:37 +02002770 SET_NEXT(tmp, NULL);
Roman Zippelc28bda22007-05-01 22:32:36 +02002771 tmp->result = DID_ABORT << 16;
2772 /* We must unlock the tag/LUN immediately here, since the
2773 * target goes to BUS FREE and doesn't send us another
2774 * message (COMMAND_COMPLETE or the like)
2775 */
2776#ifdef SUPPORT_TAGS
2777 cmd_free_tag(tmp);
2778#else
2779 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2780#endif
2781 local_irq_restore(flags);
2782 tmp->scsi_done(tmp);
2783 falcon_release_lock_if_possible(hostdata);
Michael Schmitz2b0f8342014-05-02 20:43:01 +12002784 return SUCCESS;
Roman Zippelc28bda22007-05-01 22:32:36 +02002785 }
2786 }
2787 }
2788 }
2789
2790 /*
2791 * Case 5 : If we reached this point, the command was not found in any of
2792 * the queues.
2793 *
2794 * We probably reached this point because of an unlikely race condition
2795 * between the command completing successfully and the abortion code,
2796 * so we won't panic, but we will notify the user in case something really
2797 * broke.
2798 */
2799
2800 local_irq_restore(flags);
Joe Perchesad361c92009-07-06 13:05:40 -07002801 printk(KERN_INFO "scsi%d: warning : SCSI command probably completed successfully before abortion\n", HOSTNO);
Roman Zippelc28bda22007-05-01 22:32:36 +02002802
2803 /* Maybe it is sufficient just to release the ST-DMA lock... (if
2804 * possible at all) At least, we should check if the lock could be
2805 * released after the abort, in case it is kept due to some bug.
2806 */
2807 falcon_release_lock_if_possible(hostdata);
2808
Michael Schmitz2b0f8342014-05-02 20:43:01 +12002809 return FAILED;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002810}
2811
2812
Roman Zippelc28bda22007-05-01 22:32:36 +02002813/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002814 * Function : int NCR5380_reset (Scsi_Cmnd *cmd)
Roman Zippelc28bda22007-05-01 22:32:36 +02002815 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002816 * Purpose : reset the SCSI bus.
2817 *
Michael Schmitz2b0f8342014-05-02 20:43:01 +12002818 * Returns : SUCCESS or FAILURE
Linus Torvalds1da177e2005-04-16 15:20:36 -07002819 *
Roman Zippelc28bda22007-05-01 22:32:36 +02002820 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002821
Roman Zippelc28bda22007-05-01 22:32:36 +02002822static int NCR5380_bus_reset(Scsi_Cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002823{
Roman Zippelc28bda22007-05-01 22:32:36 +02002824 SETUP_HOSTDATA(cmd->device->host);
2825 int i;
2826 unsigned long flags;
Michael Schmitz2b0f8342014-05-02 20:43:01 +12002827#if defined(RESET_RUN_DONE)
Roman Zippelc28bda22007-05-01 22:32:36 +02002828 Scsi_Cmnd *connected, *disconnected_queue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002829#endif
2830
Roman Zippelc28bda22007-05-01 22:32:36 +02002831 if (!IS_A_TT() && !falcon_got_lock)
2832 printk(KERN_ERR "scsi%d: !!BINGO!! Falcon has no lock in NCR5380_reset\n",
2833 H_NO(cmd));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002834
Roman Zippelc28bda22007-05-01 22:32:36 +02002835 NCR5380_print_status(cmd->device->host);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002836
Roman Zippelc28bda22007-05-01 22:32:36 +02002837 /* get in phase */
2838 NCR5380_write(TARGET_COMMAND_REG,
2839 PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG)));
2840 /* assert RST */
2841 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST);
2842 udelay(40);
2843 /* reset NCR registers */
2844 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2845 NCR5380_write(MODE_REG, MR_BASE);
2846 NCR5380_write(TARGET_COMMAND_REG, 0);
2847 NCR5380_write(SELECT_ENABLE_REG, 0);
2848 /* ++roman: reset interrupt condition! otherwise no interrupts don't get
2849 * through anymore ... */
2850 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002851
Michael Schmitz2b0f8342014-05-02 20:43:01 +12002852 /* MSch 20140115 - looking at the generic NCR5380 driver, all of this
2853 * should go.
2854 * Catch-22: if we don't clear all queues, the SCSI driver lock will
2855 * not be reset by atari_scsi_reset()!
2856 */
2857
2858#if defined(RESET_RUN_DONE)
2859 /* XXX Should now be done by midlevel code, but it's broken XXX */
Roman Zippelc28bda22007-05-01 22:32:36 +02002860 /* XXX see below XXX */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002861
Roman Zippelc28bda22007-05-01 22:32:36 +02002862 /* MSch: old-style reset: actually abort all command processing here */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002863
Roman Zippelc28bda22007-05-01 22:32:36 +02002864 /* After the reset, there are no more connected or disconnected commands
2865 * and no busy units; to avoid problems with re-inserting the commands
2866 * into the issue_queue (via scsi_done()), the aborted commands are
2867 * remembered in local variables first.
2868 */
2869 local_irq_save(flags);
2870 connected = (Scsi_Cmnd *)hostdata->connected;
2871 hostdata->connected = NULL;
2872 disconnected_queue = (Scsi_Cmnd *)hostdata->disconnected_queue;
2873 hostdata->disconnected_queue = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002874#ifdef SUPPORT_TAGS
Roman Zippelc28bda22007-05-01 22:32:36 +02002875 free_all_tags();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002876#endif
Roman Zippelc28bda22007-05-01 22:32:36 +02002877 for (i = 0; i < 8; ++i)
2878 hostdata->busy[i] = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002879#ifdef REAL_DMA
Roman Zippelc28bda22007-05-01 22:32:36 +02002880 hostdata->dma_len = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002881#endif
Roman Zippelc28bda22007-05-01 22:32:36 +02002882 local_irq_restore(flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002883
Roman Zippelc28bda22007-05-01 22:32:36 +02002884 /* In order to tell the mid-level code which commands were aborted,
2885 * set the command status to DID_RESET and call scsi_done() !!!
2886 * This ultimately aborts processing of these commands in the mid-level.
2887 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002888
Roman Zippelc28bda22007-05-01 22:32:36 +02002889 if ((cmd = connected)) {
Finn Thaind65e6342014-03-18 11:42:20 +11002890 dprintk(NDEBUG_ABORT, "scsi%d: reset aborted a connected command\n", H_NO(cmd));
Roman Zippelc28bda22007-05-01 22:32:36 +02002891 cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16);
2892 cmd->scsi_done(cmd);
2893 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002894
Roman Zippelc28bda22007-05-01 22:32:36 +02002895 for (i = 0; (cmd = disconnected_queue); ++i) {
2896 disconnected_queue = NEXT(cmd);
Roman Zippel3130d902007-05-01 22:32:37 +02002897 SET_NEXT(cmd, NULL);
Roman Zippelc28bda22007-05-01 22:32:36 +02002898 cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16);
2899 cmd->scsi_done(cmd);
2900 }
2901 if (i > 0)
Finn Thaind65e6342014-03-18 11:42:20 +11002902 dprintk(NDEBUG_ABORT, "scsi: reset aborted %d disconnected command(s)\n", i);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002903
Roman Zippelc28bda22007-05-01 22:32:36 +02002904 /* The Falcon lock should be released after a reset...
2905 */
2906 /* ++guenther: moved to atari_scsi_reset(), to prevent a race between
2907 * unlocking and enabling dma interrupt.
2908 */
2909/* falcon_release_lock_if_possible( hostdata );*/
Linus Torvalds1da177e2005-04-16 15:20:36 -07002910
Roman Zippelc28bda22007-05-01 22:32:36 +02002911 /* since all commands have been explicitly terminated, we need to tell
2912 * the midlevel code that the reset was SUCCESSFUL, and there is no
2913 * need to 'wake up' the commands by a request_sense
2914 */
Michael Schmitz2b0f8342014-05-02 20:43:01 +12002915 return SUCCESS;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002916#else /* 1 */
2917
Roman Zippelc28bda22007-05-01 22:32:36 +02002918 /* MSch: new-style reset handling: let the mid-level do what it can */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002919
Roman Zippelc28bda22007-05-01 22:32:36 +02002920 /* ++guenther: MID-LEVEL IS STILL BROKEN.
2921 * Mid-level is supposed to requeue all commands that were active on the
2922 * various low-level queues. In fact it does this, but that's not enough
2923 * because all these commands are subject to timeout. And if a timeout
2924 * happens for any removed command, *_abort() is called but all queues
2925 * are now empty. Abort then gives up the falcon lock, which is fatal,
2926 * since the mid-level will queue more commands and must have the lock
2927 * (it's all happening inside timer interrupt handler!!).
2928 * Even worse, abort will return NOT_RUNNING for all those commands not
2929 * on any queue, so they won't be retried ...
2930 *
2931 * Conclusion: either scsi.c disables timeout for all resetted commands
2932 * immediately, or we lose! As of linux-2.0.20 it doesn't.
2933 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002934
Roman Zippelc28bda22007-05-01 22:32:36 +02002935 /* After the reset, there are no more connected or disconnected commands
2936 * and no busy units; so clear the low-level status here to avoid
2937 * conflicts when the mid-level code tries to wake up the affected
2938 * commands!
2939 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002940
Roman Zippelc28bda22007-05-01 22:32:36 +02002941 if (hostdata->issue_queue)
Finn Thaind65e6342014-03-18 11:42:20 +11002942 dprintk(NDEBUG_ABORT, "scsi%d: reset aborted issued command(s)\n", H_NO(cmd));
Roman Zippelc28bda22007-05-01 22:32:36 +02002943 if (hostdata->connected)
Finn Thaind65e6342014-03-18 11:42:20 +11002944 dprintk(NDEBUG_ABORT, "scsi%d: reset aborted a connected command\n", H_NO(cmd));
Roman Zippelc28bda22007-05-01 22:32:36 +02002945 if (hostdata->disconnected_queue)
Finn Thaind65e6342014-03-18 11:42:20 +11002946 dprintk(NDEBUG_ABORT, "scsi%d: reset aborted disconnected command(s)\n", H_NO(cmd));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002947
Roman Zippelc28bda22007-05-01 22:32:36 +02002948 local_irq_save(flags);
2949 hostdata->issue_queue = NULL;
2950 hostdata->connected = NULL;
2951 hostdata->disconnected_queue = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002952#ifdef SUPPORT_TAGS
Roman Zippelc28bda22007-05-01 22:32:36 +02002953 free_all_tags();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002954#endif
Roman Zippelc28bda22007-05-01 22:32:36 +02002955 for (i = 0; i < 8; ++i)
2956 hostdata->busy[i] = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002957#ifdef REAL_DMA
Roman Zippelc28bda22007-05-01 22:32:36 +02002958 hostdata->dma_len = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002959#endif
Roman Zippelc28bda22007-05-01 22:32:36 +02002960 local_irq_restore(flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002961
Roman Zippelc28bda22007-05-01 22:32:36 +02002962 /* we did no complete reset of all commands, so a wakeup is required */
Michael Schmitz2b0f8342014-05-02 20:43:01 +12002963 return SUCCESS;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002964#endif /* 1 */
2965}