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Linux 3.18.139
[linux/fpc-iii.git] / drivers / dma / iop-adma.c
blobc56137bc3868da7cdc43bf38fab53a30ca410430
1 /*
2 * offload engine driver for the Intel Xscale series of i/o processors
3 * Copyright © 2006, Intel Corporation.
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms and conditions of the GNU General Public License,
7 * version 2, as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
17 *
18 */
19
20 /*
21 * This driver supports the asynchrounous DMA copy and RAID engines available
22 * on the Intel Xscale(R) family of I/O Processors (IOP 32x, 33x, 134x)
23 */
24
25 #include <linux/init.h>
26 #include <linux/module.h>
27 #include <linux/delay.h>
28 #include <linux/dma-mapping.h>
29 #include <linux/spinlock.h>
30 #include <linux/interrupt.h>
31 #include <linux/platform_device.h>
32 #include <linux/memory.h>
33 #include <linux/ioport.h>
34 #include <linux/raid/pq.h>
35 #include <linux/slab.h>
36
37 #include <mach/adma.h>
38
39 #include "dmaengine.h"
40
41 #define to_iop_adma_chan(chan) container_of(chan, struct iop_adma_chan, common)
42 #define to_iop_adma_device(dev) \
43 container_of(dev, struct iop_adma_device, common)
44 #define tx_to_iop_adma_slot(tx) \
45 container_of(tx, struct iop_adma_desc_slot, async_tx)
46
47 /**
48 * iop_adma_free_slots - flags descriptor slots for reuse
49 * @slot: Slot to free
50 * Caller must hold &iop_chan->lock while calling this function
51 */
52 static void iop_adma_free_slots(struct iop_adma_desc_slot *slot)
53 {
54 int stride = slot->slots_per_op;
55
56 while (stride--) {
57 slot->slots_per_op = 0;
58 slot = list_entry(slot->slot_node.next,
59 struct iop_adma_desc_slot,
60 slot_node);
61 }
62 }
63
64 static dma_cookie_t
65 iop_adma_run_tx_complete_actions(struct iop_adma_desc_slot *desc,
66 struct iop_adma_chan *iop_chan, dma_cookie_t cookie)
67 {
68 struct dma_async_tx_descriptor *tx = &desc->async_tx;
69
70 BUG_ON(tx->cookie < 0);
71 if (tx->cookie > 0) {
72 cookie = tx->cookie;
73 tx->cookie = 0;
74
75 /* call the callback (must not sleep or submit new
76 * operations to this channel)
77 */
78 if (tx->callback)
79 tx->callback(tx->callback_param);
80
81 dma_descriptor_unmap(tx);
82 if (desc->group_head)
83 desc->group_head = NULL;
84 }
85
86 /* run dependent operations */
87 dma_run_dependencies(tx);
88
89 return cookie;
90 }
91
92 static int
93 iop_adma_clean_slot(struct iop_adma_desc_slot *desc,
94 struct iop_adma_chan *iop_chan)
95 {
96 /* the client is allowed to attach dependent operations
97 * until 'ack' is set
98 */
99 if (!async_tx_test_ack(&desc->async_tx))
100 return 0;
101
102 /* leave the last descriptor in the chain
103 * so we can append to it
104 */
105 if (desc->chain_node.next == &iop_chan->chain)
106 return 1;
107
108 dev_dbg(iop_chan->device->common.dev,
109 "\tfree slot: %d slots_per_op: %d\n",
110 desc->idx, desc->slots_per_op);
111
112 list_del(&desc->chain_node);
113 iop_adma_free_slots(desc);
114
115 return 0;
116 }
117
118 static void __iop_adma_slot_cleanup(struct iop_adma_chan *iop_chan)
119 {
120 struct iop_adma_desc_slot *iter, *_iter, *grp_start = NULL;
121 dma_cookie_t cookie = 0;
122 u32 current_desc = iop_chan_get_current_descriptor(iop_chan);
123 int busy = iop_chan_is_busy(iop_chan);
124 int seen_current = 0, slot_cnt = 0, slots_per_op = 0;
125
126 dev_dbg(iop_chan->device->common.dev, "%s\n", __func__);
127 /* free completed slots from the chain starting with
128 * the oldest descriptor
129 */
130 list_for_each_entry_safe(iter, _iter, &iop_chan->chain,
131 chain_node) {
132 pr_debug("\tcookie: %d slot: %d busy: %d "
133 "this_desc: %#x next_desc: %#x ack: %d\n",
134 iter->async_tx.cookie, iter->idx, busy,
135 iter->async_tx.phys, iop_desc_get_next_desc(iter),
136 async_tx_test_ack(&iter->async_tx));
137 prefetch(_iter);
138 prefetch(&_iter->async_tx);
139
140 /* do not advance past the current descriptor loaded into the
141 * hardware channel, subsequent descriptors are either in
142 * process or have not been submitted
143 */
144 if (seen_current)
145 break;
146
147 /* stop the search if we reach the current descriptor and the
148 * channel is busy, or if it appears that the current descriptor
149 * needs to be re-read (i.e. has been appended to)
150 */
151 if (iter->async_tx.phys == current_desc) {
152 BUG_ON(seen_current++);
153 if (busy || iop_desc_get_next_desc(iter))
154 break;
155 }
156
157 /* detect the start of a group transaction */
158 if (!slot_cnt && !slots_per_op) {
159 slot_cnt = iter->slot_cnt;
160 slots_per_op = iter->slots_per_op;
161 if (slot_cnt <= slots_per_op) {
162 slot_cnt = 0;
163 slots_per_op = 0;
164 }
165 }
166
167 if (slot_cnt) {
168 pr_debug("\tgroup++\n");
169 if (!grp_start)
170 grp_start = iter;
171 slot_cnt -= slots_per_op;
172 }
173
174 /* all the members of a group are complete */
175 if (slots_per_op != 0 && slot_cnt == 0) {
176 struct iop_adma_desc_slot *grp_iter, *_grp_iter;
177 int end_of_chain = 0;
178 pr_debug("\tgroup end\n");
179
180 /* collect the total results */
181 if (grp_start->xor_check_result) {
182 u32 zero_sum_result = 0;
183 slot_cnt = grp_start->slot_cnt;
184 grp_iter = grp_start;
185
186 list_for_each_entry_from(grp_iter,
187 &iop_chan->chain, chain_node) {
188 zero_sum_result |=
189 iop_desc_get_zero_result(grp_iter);
190 pr_debug("\titer%d result: %d\n",
191 grp_iter->idx, zero_sum_result);
192 slot_cnt -= slots_per_op;
193 if (slot_cnt == 0)
194 break;
195 }
196 pr_debug("\tgrp_start->xor_check_result: %p\n",
197 grp_start->xor_check_result);
198 *grp_start->xor_check_result = zero_sum_result;
199 }
200
201 /* clean up the group */
202 slot_cnt = grp_start->slot_cnt;
203 grp_iter = grp_start;
204 list_for_each_entry_safe_from(grp_iter, _grp_iter,
205 &iop_chan->chain, chain_node) {
206 cookie = iop_adma_run_tx_complete_actions(
207 grp_iter, iop_chan, cookie);
208
209 slot_cnt -= slots_per_op;
210 end_of_chain = iop_adma_clean_slot(grp_iter,
211 iop_chan);
212
213 if (slot_cnt == 0 || end_of_chain)
214 break;
215 }
216
217 /* the group should be complete at this point */
218 BUG_ON(slot_cnt);
219
220 slots_per_op = 0;
221 grp_start = NULL;
222 if (end_of_chain)
223 break;
224 else
225 continue;
226 } else if (slots_per_op) /* wait for group completion */
227 continue;
228
229 /* write back zero sum results (single descriptor case) */
230 if (iter->xor_check_result && iter->async_tx.cookie)
231 *iter->xor_check_result =
232 iop_desc_get_zero_result(iter);
233
234 cookie = iop_adma_run_tx_complete_actions(
235 iter, iop_chan, cookie);
236
237 if (iop_adma_clean_slot(iter, iop_chan))
238 break;
239 }
240
241 if (cookie > 0) {
242 iop_chan->common.completed_cookie = cookie;
243 pr_debug("\tcompleted cookie %d\n", cookie);
244 }
245 }
246
247 static void
248 iop_adma_slot_cleanup(struct iop_adma_chan *iop_chan)
249 {
250 spin_lock_bh(&iop_chan->lock);
251 __iop_adma_slot_cleanup(iop_chan);
252 spin_unlock_bh(&iop_chan->lock);
253 }
254
255 static void iop_adma_tasklet(unsigned long data)
256 {
257 struct iop_adma_chan *iop_chan = (struct iop_adma_chan *) data;
258
259 /* lockdep will flag depedency submissions as potentially
260 * recursive locking, this is not the case as a dependency
261 * submission will never recurse a channels submit routine.
262 * There are checks in async_tx.c to prevent this.
263 */
264 spin_lock_nested(&iop_chan->lock, SINGLE_DEPTH_NESTING);
265 __iop_adma_slot_cleanup(iop_chan);
266 spin_unlock(&iop_chan->lock);
267 }
268
269 static struct iop_adma_desc_slot *
270 iop_adma_alloc_slots(struct iop_adma_chan *iop_chan, int num_slots,
271 int slots_per_op)
272 {
273 struct iop_adma_desc_slot *iter, *_iter, *alloc_start = NULL;
274 LIST_HEAD(chain);
275 int slots_found, retry = 0;
276
277 /* start search from the last allocated descrtiptor
278 * if a contiguous allocation can not be found start searching
279 * from the beginning of the list
280 */
281 retry:
282 slots_found = 0;
283 if (retry == 0)
284 iter = iop_chan->last_used;
285 else
286 iter = list_entry(&iop_chan->all_slots,
287 struct iop_adma_desc_slot,
288 slot_node);
289
290 list_for_each_entry_safe_continue(
291 iter, _iter, &iop_chan->all_slots, slot_node) {
292 prefetch(_iter);
293 prefetch(&_iter->async_tx);
294 if (iter->slots_per_op) {
295 /* give up after finding the first busy slot
296 * on the second pass through the list
297 */
298 if (retry)
299 break;
300
301 slots_found = 0;
302 continue;
303 }
304
305 /* start the allocation if the slot is correctly aligned */
306 if (!slots_found++) {
307 if (iop_desc_is_aligned(iter, slots_per_op))
308 alloc_start = iter;
309 else {
310 slots_found = 0;
311 continue;
312 }
313 }
314
315 if (slots_found == num_slots) {
316 struct iop_adma_desc_slot *alloc_tail = NULL;
317 struct iop_adma_desc_slot *last_used = NULL;
318 iter = alloc_start;
319 while (num_slots) {
320 int i;
321 dev_dbg(iop_chan->device->common.dev,
322 "allocated slot: %d "
323 "(desc %p phys: %#x) slots_per_op %d\n",
324 iter->idx, iter->hw_desc,
325 iter->async_tx.phys, slots_per_op);
326
327 /* pre-ack all but the last descriptor */
328 if (num_slots != slots_per_op)
329 async_tx_ack(&iter->async_tx);
330
331 list_add_tail(&iter->chain_node, &chain);
332 alloc_tail = iter;
333 iter->async_tx.cookie = 0;
334 iter->slot_cnt = num_slots;
335 iter->xor_check_result = NULL;
336 for (i = 0; i < slots_per_op; i++) {
337 iter->slots_per_op = slots_per_op - i;
338 last_used = iter;
339 iter = list_entry(iter->slot_node.next,
340 struct iop_adma_desc_slot,
341 slot_node);
342 }
343 num_slots -= slots_per_op;
344 }
345 alloc_tail->group_head = alloc_start;
346 alloc_tail->async_tx.cookie = -EBUSY;
347 list_splice(&chain, &alloc_tail->tx_list);
348 iop_chan->last_used = last_used;
349 iop_desc_clear_next_desc(alloc_start);
350 iop_desc_clear_next_desc(alloc_tail);
351 return alloc_tail;
352 }
353 }
354 if (!retry++)
355 goto retry;
356
357 /* perform direct reclaim if the allocation fails */
358 __iop_adma_slot_cleanup(iop_chan);
359
360 return NULL;
361 }
362
363 static void iop_adma_check_threshold(struct iop_adma_chan *iop_chan)
364 {
365 dev_dbg(iop_chan->device->common.dev, "pending: %d\n",
366 iop_chan->pending);
367
368 if (iop_chan->pending >= IOP_ADMA_THRESHOLD) {
369 iop_chan->pending = 0;
370 iop_chan_append(iop_chan);
371 }
372 }
373
374 static dma_cookie_t
375 iop_adma_tx_submit(struct dma_async_tx_descriptor *tx)
376 {
377 struct iop_adma_desc_slot *sw_desc = tx_to_iop_adma_slot(tx);
378 struct iop_adma_chan *iop_chan = to_iop_adma_chan(tx->chan);
379 struct iop_adma_desc_slot *grp_start, *old_chain_tail;
380 int slot_cnt;
381 int slots_per_op;
382 dma_cookie_t cookie;
383 dma_addr_t next_dma;
384
385 grp_start = sw_desc->group_head;
386 slot_cnt = grp_start->slot_cnt;
387 slots_per_op = grp_start->slots_per_op;
388
389 spin_lock_bh(&iop_chan->lock);
390 cookie = dma_cookie_assign(tx);
391
392 old_chain_tail = list_entry(iop_chan->chain.prev,
393 struct iop_adma_desc_slot, chain_node);
394 list_splice_init(&sw_desc->tx_list,
395 &old_chain_tail->chain_node);
396
397 /* fix up the hardware chain */
398 next_dma = grp_start->async_tx.phys;
399 iop_desc_set_next_desc(old_chain_tail, next_dma);
400 BUG_ON(iop_desc_get_next_desc(old_chain_tail) != next_dma); /* flush */
401
402 /* check for pre-chained descriptors */
403 iop_paranoia(iop_desc_get_next_desc(sw_desc));
404
405 /* increment the pending count by the number of slots
406 * memcpy operations have a 1:1 (slot:operation) relation
407 * other operations are heavier and will pop the threshold
408 * more often.
409 */
410 iop_chan->pending += slot_cnt;
411 iop_adma_check_threshold(iop_chan);
412 spin_unlock_bh(&iop_chan->lock);
413
414 dev_dbg(iop_chan->device->common.dev, "%s cookie: %d slot: %d\n",
415 __func__, sw_desc->async_tx.cookie, sw_desc->idx);
416
417 return cookie;
418 }
419
420 static void iop_chan_start_null_memcpy(struct iop_adma_chan *iop_chan);
421 static void iop_chan_start_null_xor(struct iop_adma_chan *iop_chan);
422
423 /**
424 * iop_adma_alloc_chan_resources - returns the number of allocated descriptors
425 * @chan - allocate descriptor resources for this channel
426 * @client - current client requesting the channel be ready for requests
427 *
428 * Note: We keep the slots for 1 operation on iop_chan->chain at all times. To
429 * avoid deadlock, via async_xor, num_descs_in_pool must at a minimum be
430 * greater than 2x the number slots needed to satisfy a device->max_xor
431 * request.
432 * */
433 static int iop_adma_alloc_chan_resources(struct dma_chan *chan)
434 {
435 char *hw_desc;
436 int idx;
437 struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
438 struct iop_adma_desc_slot *slot = NULL;
439 int init = iop_chan->slots_allocated ? 0 : 1;
440 struct iop_adma_platform_data *plat_data =
441 dev_get_platdata(&iop_chan->device->pdev->dev);
442 int num_descs_in_pool = plat_data->pool_size/IOP_ADMA_SLOT_SIZE;
443
444 /* Allocate descriptor slots */
445 do {
446 idx = iop_chan->slots_allocated;
447 if (idx == num_descs_in_pool)
448 break;
449
450 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
451 if (!slot) {
452 printk(KERN_INFO "IOP ADMA Channel only initialized"
453 " %d descriptor slots", idx);
454 break;
455 }
456 hw_desc = (char *) iop_chan->device->dma_desc_pool_virt;
457 slot->hw_desc = (void *) &hw_desc[idx * IOP_ADMA_SLOT_SIZE];
458
459 dma_async_tx_descriptor_init(&slot->async_tx, chan);
460 slot->async_tx.tx_submit = iop_adma_tx_submit;
461 INIT_LIST_HEAD(&slot->tx_list);
462 INIT_LIST_HEAD(&slot->chain_node);
463 INIT_LIST_HEAD(&slot->slot_node);
464 hw_desc = (char *) iop_chan->device->dma_desc_pool;
465 slot->async_tx.phys =
466 (dma_addr_t) &hw_desc[idx * IOP_ADMA_SLOT_SIZE];
467 slot->idx = idx;
468
469 spin_lock_bh(&iop_chan->lock);
470 iop_chan->slots_allocated++;
471 list_add_tail(&slot->slot_node, &iop_chan->all_slots);
472 spin_unlock_bh(&iop_chan->lock);
473 } while (iop_chan->slots_allocated < num_descs_in_pool);
474
475 if (idx && !iop_chan->last_used)
476 iop_chan->last_used = list_entry(iop_chan->all_slots.next,
477 struct iop_adma_desc_slot,
478 slot_node);
479
480 dev_dbg(iop_chan->device->common.dev,
481 "allocated %d descriptor slots last_used: %p\n",
482 iop_chan->slots_allocated, iop_chan->last_used);
483
484 /* initialize the channel and the chain with a null operation */
485 if (init) {
486 if (dma_has_cap(DMA_MEMCPY,
487 iop_chan->device->common.cap_mask))
488 iop_chan_start_null_memcpy(iop_chan);
489 else if (dma_has_cap(DMA_XOR,
490 iop_chan->device->common.cap_mask))
491 iop_chan_start_null_xor(iop_chan);
492 else
493 BUG();
494 }
495
496 return (idx > 0) ? idx : -ENOMEM;
497 }
498
499 static struct dma_async_tx_descriptor *
500 iop_adma_prep_dma_interrupt(struct dma_chan *chan, unsigned long flags)
501 {
502 struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
503 struct iop_adma_desc_slot *sw_desc, *grp_start;
504 int slot_cnt, slots_per_op;
505
506 dev_dbg(iop_chan->device->common.dev, "%s\n", __func__);
507
508 spin_lock_bh(&iop_chan->lock);
509 slot_cnt = iop_chan_interrupt_slot_count(&slots_per_op, iop_chan);
510 sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
511 if (sw_desc) {
512 grp_start = sw_desc->group_head;
513 iop_desc_init_interrupt(grp_start, iop_chan);
514 sw_desc->async_tx.flags = flags;
515 }
516 spin_unlock_bh(&iop_chan->lock);
517
518 return sw_desc ? &sw_desc->async_tx : NULL;
519 }
520
521 static struct dma_async_tx_descriptor *
522 iop_adma_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dma_dest,
523 dma_addr_t dma_src, size_t len, unsigned long flags)
524 {
525 struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
526 struct iop_adma_desc_slot *sw_desc, *grp_start;
527 int slot_cnt, slots_per_op;
528
529 if (unlikely(!len))
530 return NULL;
531 BUG_ON(len > IOP_ADMA_MAX_BYTE_COUNT);
532
533 dev_dbg(iop_chan->device->common.dev, "%s len: %u\n",
534 __func__, len);
535
536 spin_lock_bh(&iop_chan->lock);
537 slot_cnt = iop_chan_memcpy_slot_count(len, &slots_per_op);
538 sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
539 if (sw_desc) {
540 grp_start = sw_desc->group_head;
541 iop_desc_init_memcpy(grp_start, flags);
542 iop_desc_set_byte_count(grp_start, iop_chan, len);
543 iop_desc_set_dest_addr(grp_start, iop_chan, dma_dest);
544 iop_desc_set_memcpy_src_addr(grp_start, dma_src);
545 sw_desc->async_tx.flags = flags;
546 }
547 spin_unlock_bh(&iop_chan->lock);
548
549 return sw_desc ? &sw_desc->async_tx : NULL;
550 }
551
552 static struct dma_async_tx_descriptor *
553 iop_adma_prep_dma_xor(struct dma_chan *chan, dma_addr_t dma_dest,
554 dma_addr_t *dma_src, unsigned int src_cnt, size_t len,
555 unsigned long flags)
556 {
557 struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
558 struct iop_adma_desc_slot *sw_desc, *grp_start;
559 int slot_cnt, slots_per_op;
560
561 if (unlikely(!len))
562 return NULL;
563 BUG_ON(len > IOP_ADMA_XOR_MAX_BYTE_COUNT);
564
565 dev_dbg(iop_chan->device->common.dev,
566 "%s src_cnt: %d len: %u flags: %lx\n",
567 __func__, src_cnt, len, flags);
568
569 spin_lock_bh(&iop_chan->lock);
570 slot_cnt = iop_chan_xor_slot_count(len, src_cnt, &slots_per_op);
571 sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
572 if (sw_desc) {
573 grp_start = sw_desc->group_head;
574 iop_desc_init_xor(grp_start, src_cnt, flags);
575 iop_desc_set_byte_count(grp_start, iop_chan, len);
576 iop_desc_set_dest_addr(grp_start, iop_chan, dma_dest);
577 sw_desc->async_tx.flags = flags;
578 while (src_cnt--)
579 iop_desc_set_xor_src_addr(grp_start, src_cnt,
580 dma_src[src_cnt]);
581 }
582 spin_unlock_bh(&iop_chan->lock);
583
584 return sw_desc ? &sw_desc->async_tx : NULL;
585 }
586
587 static struct dma_async_tx_descriptor *
588 iop_adma_prep_dma_xor_val(struct dma_chan *chan, dma_addr_t *dma_src,
589 unsigned int src_cnt, size_t len, u32 *result,
590 unsigned long flags)
591 {
592 struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
593 struct iop_adma_desc_slot *sw_desc, *grp_start;
594 int slot_cnt, slots_per_op;
595
596 if (unlikely(!len))
597 return NULL;
598
599 dev_dbg(iop_chan->device->common.dev, "%s src_cnt: %d len: %u\n",
600 __func__, src_cnt, len);
601
602 spin_lock_bh(&iop_chan->lock);
603 slot_cnt = iop_chan_zero_sum_slot_count(len, src_cnt, &slots_per_op);
604 sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
605 if (sw_desc) {
606 grp_start = sw_desc->group_head;
607 iop_desc_init_zero_sum(grp_start, src_cnt, flags);
608 iop_desc_set_zero_sum_byte_count(grp_start, len);
609 grp_start->xor_check_result = result;
610 pr_debug("\t%s: grp_start->xor_check_result: %p\n",
611 __func__, grp_start->xor_check_result);
612 sw_desc->async_tx.flags = flags;
613 while (src_cnt--)
614 iop_desc_set_zero_sum_src_addr(grp_start, src_cnt,
615 dma_src[src_cnt]);
616 }
617 spin_unlock_bh(&iop_chan->lock);
618
619 return sw_desc ? &sw_desc->async_tx : NULL;
620 }
621
622 static struct dma_async_tx_descriptor *
623 iop_adma_prep_dma_pq(struct dma_chan *chan, dma_addr_t *dst, dma_addr_t *src,
624 unsigned int src_cnt, const unsigned char *scf, size_t len,
625 unsigned long flags)
626 {
627 struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
628 struct iop_adma_desc_slot *sw_desc, *g;
629 int slot_cnt, slots_per_op;
630 int continue_srcs;
631
632 if (unlikely(!len))
633 return NULL;
634 BUG_ON(len > IOP_ADMA_XOR_MAX_BYTE_COUNT);
635
636 dev_dbg(iop_chan->device->common.dev,
637 "%s src_cnt: %d len: %u flags: %lx\n",
638 __func__, src_cnt, len, flags);
639
640 if (dmaf_p_disabled_continue(flags))
641 continue_srcs = 1+src_cnt;
642 else if (dmaf_continue(flags))
643 continue_srcs = 3+src_cnt;
644 else
645 continue_srcs = 0+src_cnt;
646
647 spin_lock_bh(&iop_chan->lock);
648 slot_cnt = iop_chan_pq_slot_count(len, continue_srcs, &slots_per_op);
649 sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
650 if (sw_desc) {
651 int i;
652
653 g = sw_desc->group_head;
654 iop_desc_set_byte_count(g, iop_chan, len);
655
656 /* even if P is disabled its destination address (bits
657 * [3:0]) must match Q. It is ok if P points to an
658 * invalid address, it won't be written.
659 */
660 if (flags & DMA_PREP_PQ_DISABLE_P)
661 dst[0] = dst[1] & 0x7;
662
663 iop_desc_set_pq_addr(g, dst);
664 sw_desc->async_tx.flags = flags;
665 for (i = 0; i < src_cnt; i++)
666 iop_desc_set_pq_src_addr(g, i, src[i], scf[i]);
667
668 /* if we are continuing a previous operation factor in
669 * the old p and q values, see the comment for dma_maxpq
670 * in include/linux/dmaengine.h
671 */
672 if (dmaf_p_disabled_continue(flags))
673 iop_desc_set_pq_src_addr(g, i++, dst[1], 1);
674 else if (dmaf_continue(flags)) {
675 iop_desc_set_pq_src_addr(g, i++, dst[0], 0);
676 iop_desc_set_pq_src_addr(g, i++, dst[1], 1);
677 iop_desc_set_pq_src_addr(g, i++, dst[1], 0);
678 }
679 iop_desc_init_pq(g, i, flags);
680 }
681 spin_unlock_bh(&iop_chan->lock);
682
683 return sw_desc ? &sw_desc->async_tx : NULL;
684 }
685
686 static struct dma_async_tx_descriptor *
687 iop_adma_prep_dma_pq_val(struct dma_chan *chan, dma_addr_t *pq, dma_addr_t *src,
688 unsigned int src_cnt, const unsigned char *scf,
689 size_t len, enum sum_check_flags *pqres,
690 unsigned long flags)
691 {
692 struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
693 struct iop_adma_desc_slot *sw_desc, *g;
694 int slot_cnt, slots_per_op;
695
696 if (unlikely(!len))
697 return NULL;
698 BUG_ON(len > IOP_ADMA_XOR_MAX_BYTE_COUNT);
699
700 dev_dbg(iop_chan->device->common.dev, "%s src_cnt: %d len: %u\n",
701 __func__, src_cnt, len);
702
703 spin_lock_bh(&iop_chan->lock);
704 slot_cnt = iop_chan_pq_zero_sum_slot_count(len, src_cnt + 2, &slots_per_op);
705 sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
706 if (sw_desc) {
707 /* for validate operations p and q are tagged onto the
708 * end of the source list
709 */
710 int pq_idx = src_cnt;
711
712 g = sw_desc->group_head;
713 iop_desc_init_pq_zero_sum(g, src_cnt+2, flags);
714 iop_desc_set_pq_zero_sum_byte_count(g, len);
715 g->pq_check_result = pqres;
716 pr_debug("\t%s: g->pq_check_result: %p\n",
717 __func__, g->pq_check_result);
718 sw_desc->async_tx.flags = flags;
719 while (src_cnt--)
720 iop_desc_set_pq_zero_sum_src_addr(g, src_cnt,
721 src[src_cnt],
722 scf[src_cnt]);
723 iop_desc_set_pq_zero_sum_addr(g, pq_idx, src);
724 }
725 spin_unlock_bh(&iop_chan->lock);
726
727 return sw_desc ? &sw_desc->async_tx : NULL;
728 }
729
730 static void iop_adma_free_chan_resources(struct dma_chan *chan)
731 {
732 struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
733 struct iop_adma_desc_slot *iter, *_iter;
734 int in_use_descs = 0;
735
736 iop_adma_slot_cleanup(iop_chan);
737
738 spin_lock_bh(&iop_chan->lock);
739 list_for_each_entry_safe(iter, _iter, &iop_chan->chain,
740 chain_node) {
741 in_use_descs++;
742 list_del(&iter->chain_node);
743 }
744 list_for_each_entry_safe_reverse(
745 iter, _iter, &iop_chan->all_slots, slot_node) {
746 list_del(&iter->slot_node);
747 kfree(iter);
748 iop_chan->slots_allocated--;
749 }
750 iop_chan->last_used = NULL;
751
752 dev_dbg(iop_chan->device->common.dev, "%s slots_allocated %d\n",
753 __func__, iop_chan->slots_allocated);
754 spin_unlock_bh(&iop_chan->lock);
755
756 /* one is ok since we left it on there on purpose */
757 if (in_use_descs > 1)
758 printk(KERN_ERR "IOP: Freeing %d in use descriptors!\n",
759 in_use_descs - 1);
760 }
761
762 /**
763 * iop_adma_status - poll the status of an ADMA transaction
764 * @chan: ADMA channel handle
765 * @cookie: ADMA transaction identifier
766 * @txstate: a holder for the current state of the channel or NULL
767 */
768 static enum dma_status iop_adma_status(struct dma_chan *chan,
769 dma_cookie_t cookie,
770 struct dma_tx_state *txstate)
771 {
772 struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
773 int ret;
774
775 ret = dma_cookie_status(chan, cookie, txstate);
776 if (ret == DMA_COMPLETE)
777 return ret;
778
779 iop_adma_slot_cleanup(iop_chan);
780
781 return dma_cookie_status(chan, cookie, txstate);
782 }
783
784 static irqreturn_t iop_adma_eot_handler(int irq, void *data)
785 {
786 struct iop_adma_chan *chan = data;
787
788 dev_dbg(chan->device->common.dev, "%s\n", __func__);
789
790 tasklet_schedule(&chan->irq_tasklet);
791
792 iop_adma_device_clear_eot_status(chan);
793
794 return IRQ_HANDLED;
795 }
796
797 static irqreturn_t iop_adma_eoc_handler(int irq, void *data)
798 {
799 struct iop_adma_chan *chan = data;
800
801 dev_dbg(chan->device->common.dev, "%s\n", __func__);
802
803 tasklet_schedule(&chan->irq_tasklet);
804
805 iop_adma_device_clear_eoc_status(chan);
806
807 return IRQ_HANDLED;
808 }
809
810 static irqreturn_t iop_adma_err_handler(int irq, void *data)
811 {
812 struct iop_adma_chan *chan = data;
813 unsigned long status = iop_chan_get_status(chan);
814
815 dev_err(chan->device->common.dev,
816 "error ( %s%s%s%s%s%s%s)\n",
817 iop_is_err_int_parity(status, chan) ? "int_parity " : "",
818 iop_is_err_mcu_abort(status, chan) ? "mcu_abort " : "",
819 iop_is_err_int_tabort(status, chan) ? "int_tabort " : "",
820 iop_is_err_int_mabort(status, chan) ? "int_mabort " : "",
821 iop_is_err_pci_tabort(status, chan) ? "pci_tabort " : "",
822 iop_is_err_pci_mabort(status, chan) ? "pci_mabort " : "",
823 iop_is_err_split_tx(status, chan) ? "split_tx " : "");
824
825 iop_adma_device_clear_err_status(chan);
826
827 BUG();
828
829 return IRQ_HANDLED;
830 }
831
832 static void iop_adma_issue_pending(struct dma_chan *chan)
833 {
834 struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
835
836 if (iop_chan->pending) {
837 iop_chan->pending = 0;
838 iop_chan_append(iop_chan);
839 }
840 }
841
842 /*
843 * Perform a transaction to verify the HW works.
844 */
845 #define IOP_ADMA_TEST_SIZE 2000
846
847 static int iop_adma_memcpy_self_test(struct iop_adma_device *device)
848 {
849 int i;
850 void *src, *dest;
851 dma_addr_t src_dma, dest_dma;
852 struct dma_chan *dma_chan;
853 dma_cookie_t cookie;
854 struct dma_async_tx_descriptor *tx;
855 int err = 0;
856 struct iop_adma_chan *iop_chan;
857
858 dev_dbg(device->common.dev, "%s\n", __func__);
859
860 src = kmalloc(IOP_ADMA_TEST_SIZE, GFP_KERNEL);
861 if (!src)
862 return -ENOMEM;
863 dest = kzalloc(IOP_ADMA_TEST_SIZE, GFP_KERNEL);
864 if (!dest) {
865 kfree(src);
866 return -ENOMEM;
867 }
868
869 /* Fill in src buffer */
870 for (i = 0; i < IOP_ADMA_TEST_SIZE; i++)
871 ((u8 *) src)[i] = (u8)i;
872
873 /* Start copy, using first DMA channel */
874 dma_chan = container_of(device->common.channels.next,
875 struct dma_chan,
876 device_node);
877 if (iop_adma_alloc_chan_resources(dma_chan) < 1) {
878 err = -ENODEV;
879 goto out;
880 }
881
882 dest_dma = dma_map_single(dma_chan->device->dev, dest,
883 IOP_ADMA_TEST_SIZE, DMA_FROM_DEVICE);
884 src_dma = dma_map_single(dma_chan->device->dev, src,
885 IOP_ADMA_TEST_SIZE, DMA_TO_DEVICE);
886 tx = iop_adma_prep_dma_memcpy(dma_chan, dest_dma, src_dma,
887 IOP_ADMA_TEST_SIZE,
888 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
889
890 cookie = iop_adma_tx_submit(tx);
891 iop_adma_issue_pending(dma_chan);
892 msleep(1);
893
894 if (iop_adma_status(dma_chan, cookie, NULL) !=
895 DMA_COMPLETE) {
896 dev_err(dma_chan->device->dev,
897 "Self-test copy timed out, disabling\n");
898 err = -ENODEV;
899 goto free_resources;
900 }
901
902 iop_chan = to_iop_adma_chan(dma_chan);
903 dma_sync_single_for_cpu(&iop_chan->device->pdev->dev, dest_dma,
904 IOP_ADMA_TEST_SIZE, DMA_FROM_DEVICE);
905 if (memcmp(src, dest, IOP_ADMA_TEST_SIZE)) {
906 dev_err(dma_chan->device->dev,
907 "Self-test copy failed compare, disabling\n");
908 err = -ENODEV;
909 goto free_resources;
910 }
911
912 free_resources:
913 iop_adma_free_chan_resources(dma_chan);
914 out:
915 kfree(src);
916 kfree(dest);
917 return err;
918 }
919
920 #define IOP_ADMA_NUM_SRC_TEST 4 /* must be <= 15 */
921 static int
922 iop_adma_xor_val_self_test(struct iop_adma_device *device)
923 {
924 int i, src_idx;
925 struct page *dest;
926 struct page *xor_srcs[IOP_ADMA_NUM_SRC_TEST];
927 struct page *zero_sum_srcs[IOP_ADMA_NUM_SRC_TEST + 1];
928 dma_addr_t dma_srcs[IOP_ADMA_NUM_SRC_TEST + 1];
929 dma_addr_t dest_dma;
930 struct dma_async_tx_descriptor *tx;
931 struct dma_chan *dma_chan;
932 dma_cookie_t cookie;
933 u8 cmp_byte = 0;
934 u32 cmp_word;
935 u32 zero_sum_result;
936 int err = 0;
937 struct iop_adma_chan *iop_chan;
938
939 dev_dbg(device->common.dev, "%s\n", __func__);
940
941 for (src_idx = 0; src_idx < IOP_ADMA_NUM_SRC_TEST; src_idx++) {
942 xor_srcs[src_idx] = alloc_page(GFP_KERNEL);
943 if (!xor_srcs[src_idx]) {
944 while (src_idx--)
945 __free_page(xor_srcs[src_idx]);
946 return -ENOMEM;
947 }
948 }
949
950 dest = alloc_page(GFP_KERNEL);
951 if (!dest) {
952 while (src_idx--)
953 __free_page(xor_srcs[src_idx]);
954 return -ENOMEM;
955 }
956
957 /* Fill in src buffers */
958 for (src_idx = 0; src_idx < IOP_ADMA_NUM_SRC_TEST; src_idx++) {
959 u8 *ptr = page_address(xor_srcs[src_idx]);
960 for (i = 0; i < PAGE_SIZE; i++)
961 ptr[i] = (1 << src_idx);
962 }
963
964 for (src_idx = 0; src_idx < IOP_ADMA_NUM_SRC_TEST; src_idx++)
965 cmp_byte ^= (u8) (1 << src_idx);
966
967 cmp_word = (cmp_byte << 24) | (cmp_byte << 16) |
968 (cmp_byte << 8) | cmp_byte;
969
970 memset(page_address(dest), 0, PAGE_SIZE);
971
972 dma_chan = container_of(device->common.channels.next,
973 struct dma_chan,
974 device_node);
975 if (iop_adma_alloc_chan_resources(dma_chan) < 1) {
976 err = -ENODEV;
977 goto out;
978 }
979
980 /* test xor */
981 dest_dma = dma_map_page(dma_chan->device->dev, dest, 0,
982 PAGE_SIZE, DMA_FROM_DEVICE);
983 for (i = 0; i < IOP_ADMA_NUM_SRC_TEST; i++)
984 dma_srcs[i] = dma_map_page(dma_chan->device->dev, xor_srcs[i],
985 0, PAGE_SIZE, DMA_TO_DEVICE);
986 tx = iop_adma_prep_dma_xor(dma_chan, dest_dma, dma_srcs,
987 IOP_ADMA_NUM_SRC_TEST, PAGE_SIZE,
988 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
989
990 cookie = iop_adma_tx_submit(tx);
991 iop_adma_issue_pending(dma_chan);
992 msleep(8);
993
994 if (iop_adma_status(dma_chan, cookie, NULL) !=
995 DMA_COMPLETE) {
996 dev_err(dma_chan->device->dev,
997 "Self-test xor timed out, disabling\n");
998 err = -ENODEV;
999 goto free_resources;
1000 }
1001
1002 iop_chan = to_iop_adma_chan(dma_chan);
1003 dma_sync_single_for_cpu(&iop_chan->device->pdev->dev, dest_dma,
1004 PAGE_SIZE, DMA_FROM_DEVICE);
1005 for (i = 0; i < (PAGE_SIZE / sizeof(u32)); i++) {
1006 u32 *ptr = page_address(dest);
1007 if (ptr[i] != cmp_word) {
1008 dev_err(dma_chan->device->dev,
1009 "Self-test xor failed compare, disabling\n");
1010 err = -ENODEV;
1011 goto free_resources;
1012 }
1013 }
1014 dma_sync_single_for_device(&iop_chan->device->pdev->dev, dest_dma,
1015 PAGE_SIZE, DMA_TO_DEVICE);
1016
1017 /* skip zero sum if the capability is not present */
1018 if (!dma_has_cap(DMA_XOR_VAL, dma_chan->device->cap_mask))
1019 goto free_resources;
1020
1021 /* zero sum the sources with the destintation page */
1022 for (i = 0; i < IOP_ADMA_NUM_SRC_TEST; i++)
1023 zero_sum_srcs[i] = xor_srcs[i];
1024 zero_sum_srcs[i] = dest;
1025
1026 zero_sum_result = 1;
1027
1028 for (i = 0; i < IOP_ADMA_NUM_SRC_TEST + 1; i++)
1029 dma_srcs[i] = dma_map_page(dma_chan->device->dev,
1030 zero_sum_srcs[i], 0, PAGE_SIZE,
1031 DMA_TO_DEVICE);
1032 tx = iop_adma_prep_dma_xor_val(dma_chan, dma_srcs,
1033 IOP_ADMA_NUM_SRC_TEST + 1, PAGE_SIZE,
1034 &zero_sum_result,
1035 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1036
1037 cookie = iop_adma_tx_submit(tx);
1038 iop_adma_issue_pending(dma_chan);
1039 msleep(8);
1040
1041 if (iop_adma_status(dma_chan, cookie, NULL) != DMA_COMPLETE) {
1042 dev_err(dma_chan->device->dev,
1043 "Self-test zero sum timed out, disabling\n");
1044 err = -ENODEV;
1045 goto free_resources;
1046 }
1047
1048 if (zero_sum_result != 0) {
1049 dev_err(dma_chan->device->dev,
1050 "Self-test zero sum failed compare, disabling\n");
1051 err = -ENODEV;
1052 goto free_resources;
1053 }
1054
1055 /* test for non-zero parity sum */
1056 zero_sum_result = 0;
1057 for (i = 0; i < IOP_ADMA_NUM_SRC_TEST + 1; i++)
1058 dma_srcs[i] = dma_map_page(dma_chan->device->dev,
1059 zero_sum_srcs[i], 0, PAGE_SIZE,
1060 DMA_TO_DEVICE);
1061 tx = iop_adma_prep_dma_xor_val(dma_chan, dma_srcs,
1062 IOP_ADMA_NUM_SRC_TEST + 1, PAGE_SIZE,
1063 &zero_sum_result,
1064 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1065
1066 cookie = iop_adma_tx_submit(tx);
1067 iop_adma_issue_pending(dma_chan);
1068 msleep(8);
1069
1070 if (iop_adma_status(dma_chan, cookie, NULL) != DMA_COMPLETE) {
1071 dev_err(dma_chan->device->dev,
1072 "Self-test non-zero sum timed out, disabling\n");
1073 err = -ENODEV;
1074 goto free_resources;
1075 }
1076
1077 if (zero_sum_result != 1) {
1078 dev_err(dma_chan->device->dev,
1079 "Self-test non-zero sum failed compare, disabling\n");
1080 err = -ENODEV;
1081 goto free_resources;
1082 }
1083
1084 free_resources:
1085 iop_adma_free_chan_resources(dma_chan);
1086 out:
1087 src_idx = IOP_ADMA_NUM_SRC_TEST;
1088 while (src_idx--)
1089 __free_page(xor_srcs[src_idx]);
1090 __free_page(dest);
1091 return err;
1092 }
1093
1094 #ifdef CONFIG_RAID6_PQ
1095 static int
1096 iop_adma_pq_zero_sum_self_test(struct iop_adma_device *device)
1097 {
1098 /* combined sources, software pq results, and extra hw pq results */
1099 struct page *pq[IOP_ADMA_NUM_SRC_TEST+2+2];
1100 /* ptr to the extra hw pq buffers defined above */
1101 struct page **pq_hw = &pq[IOP_ADMA_NUM_SRC_TEST+2];
1102 /* address conversion buffers (dma_map / page_address) */
1103 void *pq_sw[IOP_ADMA_NUM_SRC_TEST+2];
1104 dma_addr_t pq_src[IOP_ADMA_NUM_SRC_TEST+2];
1105 dma_addr_t *pq_dest = &pq_src[IOP_ADMA_NUM_SRC_TEST];
1106
1107 int i;
1108 struct dma_async_tx_descriptor *tx;
1109 struct dma_chan *dma_chan;
1110 dma_cookie_t cookie;
1111 u32 zero_sum_result;
1112 int err = 0;
1113 struct device *dev;
1114
1115 dev_dbg(device->common.dev, "%s\n", __func__);
1116
1117 for (i = 0; i < ARRAY_SIZE(pq); i++) {
1118 pq[i] = alloc_page(GFP_KERNEL);
1119 if (!pq[i]) {
1120 while (i--)
1121 __free_page(pq[i]);
1122 return -ENOMEM;
1123 }
1124 }
1125
1126 /* Fill in src buffers */
1127 for (i = 0; i < IOP_ADMA_NUM_SRC_TEST; i++) {
1128 pq_sw[i] = page_address(pq[i]);
1129 memset(pq_sw[i], 0x11111111 * (1<<i), PAGE_SIZE);
1130 }
1131 pq_sw[i] = page_address(pq[i]);
1132 pq_sw[i+1] = page_address(pq[i+1]);
1133
1134 dma_chan = container_of(device->common.channels.next,
1135 struct dma_chan,
1136 device_node);
1137 if (iop_adma_alloc_chan_resources(dma_chan) < 1) {
1138 err = -ENODEV;
1139 goto out;
1140 }
1141
1142 dev = dma_chan->device->dev;
1143
1144 /* initialize the dests */
1145 memset(page_address(pq_hw[0]), 0 , PAGE_SIZE);
1146 memset(page_address(pq_hw[1]), 0 , PAGE_SIZE);
1147
1148 /* test pq */
1149 pq_dest[0] = dma_map_page(dev, pq_hw[0], 0, PAGE_SIZE, DMA_FROM_DEVICE);
1150 pq_dest[1] = dma_map_page(dev, pq_hw[1], 0, PAGE_SIZE, DMA_FROM_DEVICE);
1151 for (i = 0; i < IOP_ADMA_NUM_SRC_TEST; i++)
1152 pq_src[i] = dma_map_page(dev, pq[i], 0, PAGE_SIZE,
1153 DMA_TO_DEVICE);
1154
1155 tx = iop_adma_prep_dma_pq(dma_chan, pq_dest, pq_src,
1156 IOP_ADMA_NUM_SRC_TEST, (u8 *)raid6_gfexp,
1157 PAGE_SIZE,
1158 DMA_PREP_INTERRUPT |
1159 DMA_CTRL_ACK);
1160
1161 cookie = iop_adma_tx_submit(tx);
1162 iop_adma_issue_pending(dma_chan);
1163 msleep(8);
1164
1165 if (iop_adma_status(dma_chan, cookie, NULL) !=
1166 DMA_COMPLETE) {
1167 dev_err(dev, "Self-test pq timed out, disabling\n");
1168 err = -ENODEV;
1169 goto free_resources;
1170 }
1171
1172 raid6_call.gen_syndrome(IOP_ADMA_NUM_SRC_TEST+2, PAGE_SIZE, pq_sw);
1173
1174 if (memcmp(pq_sw[IOP_ADMA_NUM_SRC_TEST],
1175 page_address(pq_hw[0]), PAGE_SIZE) != 0) {
1176 dev_err(dev, "Self-test p failed compare, disabling\n");
1177 err = -ENODEV;
1178 goto free_resources;
1179 }
1180 if (memcmp(pq_sw[IOP_ADMA_NUM_SRC_TEST+1],
1181 page_address(pq_hw[1]), PAGE_SIZE) != 0) {
1182 dev_err(dev, "Self-test q failed compare, disabling\n");
1183 err = -ENODEV;
1184 goto free_resources;
1185 }
1186
1187 /* test correct zero sum using the software generated pq values */
1188 for (i = 0; i < IOP_ADMA_NUM_SRC_TEST + 2; i++)
1189 pq_src[i] = dma_map_page(dev, pq[i], 0, PAGE_SIZE,
1190 DMA_TO_DEVICE);
1191
1192 zero_sum_result = ~0;
1193 tx = iop_adma_prep_dma_pq_val(dma_chan, &pq_src[IOP_ADMA_NUM_SRC_TEST],
1194 pq_src, IOP_ADMA_NUM_SRC_TEST,
1195 raid6_gfexp, PAGE_SIZE, &zero_sum_result,
1196 DMA_PREP_INTERRUPT|DMA_CTRL_ACK);
1197
1198 cookie = iop_adma_tx_submit(tx);
1199 iop_adma_issue_pending(dma_chan);
1200 msleep(8);
1201
1202 if (iop_adma_status(dma_chan, cookie, NULL) !=
1203 DMA_COMPLETE) {
1204 dev_err(dev, "Self-test pq-zero-sum timed out, disabling\n");
1205 err = -ENODEV;
1206 goto free_resources;
1207 }
1208
1209 if (zero_sum_result != 0) {
1210 dev_err(dev, "Self-test pq-zero-sum failed to validate: %x\n",
1211 zero_sum_result);
1212 err = -ENODEV;
1213 goto free_resources;
1214 }
1215
1216 /* test incorrect zero sum */
1217 i = IOP_ADMA_NUM_SRC_TEST;
1218 memset(pq_sw[i] + 100, 0, 100);
1219 memset(pq_sw[i+1] + 200, 0, 200);
1220 for (i = 0; i < IOP_ADMA_NUM_SRC_TEST + 2; i++)
1221 pq_src[i] = dma_map_page(dev, pq[i], 0, PAGE_SIZE,
1222 DMA_TO_DEVICE);
1223
1224 zero_sum_result = 0;
1225 tx = iop_adma_prep_dma_pq_val(dma_chan, &pq_src[IOP_ADMA_NUM_SRC_TEST],
1226 pq_src, IOP_ADMA_NUM_SRC_TEST,
1227 raid6_gfexp, PAGE_SIZE, &zero_sum_result,
1228 DMA_PREP_INTERRUPT|DMA_CTRL_ACK);
1229
1230 cookie = iop_adma_tx_submit(tx);
1231 iop_adma_issue_pending(dma_chan);
1232 msleep(8);
1233
1234 if (iop_adma_status(dma_chan, cookie, NULL) !=
1235 DMA_COMPLETE) {
1236 dev_err(dev, "Self-test !pq-zero-sum timed out, disabling\n");
1237 err = -ENODEV;
1238 goto free_resources;
1239 }
1240
1241 if (zero_sum_result != (SUM_CHECK_P_RESULT | SUM_CHECK_Q_RESULT)) {
1242 dev_err(dev, "Self-test !pq-zero-sum failed to validate: %x\n",
1243 zero_sum_result);
1244 err = -ENODEV;
1245 goto free_resources;
1246 }
1247
1248 free_resources:
1249 iop_adma_free_chan_resources(dma_chan);
1250 out:
1251 i = ARRAY_SIZE(pq);
1252 while (i--)
1253 __free_page(pq[i]);
1254 return err;
1255 }
1256 #endif
1257
1258 static int iop_adma_remove(struct platform_device *dev)
1259 {
1260 struct iop_adma_device *device = platform_get_drvdata(dev);
1261 struct dma_chan *chan, *_chan;
1262 struct iop_adma_chan *iop_chan;
1263 struct iop_adma_platform_data *plat_data = dev_get_platdata(&dev->dev);
1264
1265 dma_async_device_unregister(&device->common);
1266
1267 dma_free_coherent(&dev->dev, plat_data->pool_size,
1268 device->dma_desc_pool_virt, device->dma_desc_pool);
1269
1270 list_for_each_entry_safe(chan, _chan, &device->common.channels,
1271 device_node) {
1272 iop_chan = to_iop_adma_chan(chan);
1273 list_del(&chan->device_node);
1274 kfree(iop_chan);
1275 }
1276 kfree(device);
1277
1278 return 0;
1279 }
1280
1281 static int iop_adma_probe(struct platform_device *pdev)
1282 {
1283 struct resource *res;
1284 int ret = 0, i;
1285 struct iop_adma_device *adev;
1286 struct iop_adma_chan *iop_chan;
1287 struct dma_device *dma_dev;
1288 struct iop_adma_platform_data *plat_data = dev_get_platdata(&pdev->dev);
1289
1290 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1291 if (!res)
1292 return -ENODEV;
1293
1294 if (!devm_request_mem_region(&pdev->dev, res->start,
1295 resource_size(res), pdev->name))
1296 return -EBUSY;
1297
1298 adev = kzalloc(sizeof(*adev), GFP_KERNEL);
1299 if (!adev)
1300 return -ENOMEM;
1301 dma_dev = &adev->common;
1302
1303 /* allocate coherent memory for hardware descriptors
1304 * note: writecombine gives slightly better performance, but
1305 * requires that we explicitly flush the writes
1306 */
1307 if ((adev->dma_desc_pool_virt = dma_alloc_writecombine(&pdev->dev,
1308 plat_data->pool_size,
1309 &adev->dma_desc_pool,
1310 GFP_KERNEL)) == NULL) {
1311 ret = -ENOMEM;
1312 goto err_free_adev;
1313 }
1314
1315 dev_dbg(&pdev->dev, "%s: allocated descriptor pool virt %p phys %p\n",
1316 __func__, adev->dma_desc_pool_virt,
1317 (void *) adev->dma_desc_pool);
1318
1319 adev->id = plat_data->hw_id;
1320
1321 /* discover transaction capabilites from the platform data */
1322 dma_dev->cap_mask = plat_data->cap_mask;
1323
1324 adev->pdev = pdev;
1325 platform_set_drvdata(pdev, adev);
1326
1327 INIT_LIST_HEAD(&dma_dev->channels);
1328
1329 /* set base routines */
1330 dma_dev->device_alloc_chan_resources = iop_adma_alloc_chan_resources;
1331 dma_dev->device_free_chan_resources = iop_adma_free_chan_resources;
1332 dma_dev->device_tx_status = iop_adma_status;
1333 dma_dev->device_issue_pending = iop_adma_issue_pending;
1334 dma_dev->dev = &pdev->dev;
1335
1336 /* set prep routines based on capability */
1337 if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask))
1338 dma_dev->device_prep_dma_memcpy = iop_adma_prep_dma_memcpy;
1339 if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) {
1340 dma_dev->max_xor = iop_adma_get_max_xor();
1341 dma_dev->device_prep_dma_xor = iop_adma_prep_dma_xor;
1342 }
1343 if (dma_has_cap(DMA_XOR_VAL, dma_dev->cap_mask))
1344 dma_dev->device_prep_dma_xor_val =
1345 iop_adma_prep_dma_xor_val;
1346 if (dma_has_cap(DMA_PQ, dma_dev->cap_mask)) {
1347 dma_set_maxpq(dma_dev, iop_adma_get_max_pq(), 0);
1348 dma_dev->device_prep_dma_pq = iop_adma_prep_dma_pq;
1349 }
1350 if (dma_has_cap(DMA_PQ_VAL, dma_dev->cap_mask))
1351 dma_dev->device_prep_dma_pq_val =
1352 iop_adma_prep_dma_pq_val;
1353 if (dma_has_cap(DMA_INTERRUPT, dma_dev->cap_mask))
1354 dma_dev->device_prep_dma_interrupt =
1355 iop_adma_prep_dma_interrupt;
1356
1357 iop_chan = kzalloc(sizeof(*iop_chan), GFP_KERNEL);
1358 if (!iop_chan) {
1359 ret = -ENOMEM;
1360 goto err_free_dma;
1361 }
1362 iop_chan->device = adev;
1363
1364 iop_chan->mmr_base = devm_ioremap(&pdev->dev, res->start,
1365 resource_size(res));
1366 if (!iop_chan->mmr_base) {
1367 ret = -ENOMEM;
1368 goto err_free_iop_chan;
1369 }
1370 tasklet_init(&iop_chan->irq_tasklet, iop_adma_tasklet, (unsigned long)
1371 iop_chan);
1372
1373 /* clear errors before enabling interrupts */
1374 iop_adma_device_clear_err_status(iop_chan);
1375
1376 for (i = 0; i < 3; i++) {
1377 irq_handler_t handler[] = { iop_adma_eot_handler,
1378 iop_adma_eoc_handler,
1379 iop_adma_err_handler };
1380 int irq = platform_get_irq(pdev, i);
1381 if (irq < 0) {
1382 ret = -ENXIO;
1383 goto err_free_iop_chan;
1384 } else {
1385 ret = devm_request_irq(&pdev->dev, irq,
1386 handler[i], 0, pdev->name, iop_chan);
1387 if (ret)
1388 goto err_free_iop_chan;
1389 }
1390 }
1391
1392 spin_lock_init(&iop_chan->lock);
1393 INIT_LIST_HEAD(&iop_chan->chain);
1394 INIT_LIST_HEAD(&iop_chan->all_slots);
1395 iop_chan->common.device = dma_dev;
1396 dma_cookie_init(&iop_chan->common);
1397 list_add_tail(&iop_chan->common.device_node, &dma_dev->channels);
1398
1399 if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask)) {
1400 ret = iop_adma_memcpy_self_test(adev);
1401 dev_dbg(&pdev->dev, "memcpy self test returned %d\n", ret);
1402 if (ret)
1403 goto err_free_iop_chan;
1404 }
1405
1406 if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) {
1407 ret = iop_adma_xor_val_self_test(adev);
1408 dev_dbg(&pdev->dev, "xor self test returned %d\n", ret);
1409 if (ret)
1410 goto err_free_iop_chan;
1411 }
1412
1413 if (dma_has_cap(DMA_PQ, dma_dev->cap_mask) &&
1414 dma_has_cap(DMA_PQ_VAL, dma_dev->cap_mask)) {
1415 #ifdef CONFIG_RAID6_PQ
1416 ret = iop_adma_pq_zero_sum_self_test(adev);
1417 dev_dbg(&pdev->dev, "pq self test returned %d\n", ret);
1418 #else
1419 /* can not test raid6, so do not publish capability */
1420 dma_cap_clear(DMA_PQ, dma_dev->cap_mask);
1421 dma_cap_clear(DMA_PQ_VAL, dma_dev->cap_mask);
1422 ret = 0;
1423 #endif
1424 if (ret)
1425 goto err_free_iop_chan;
1426 }
1427
1428 dev_info(&pdev->dev, "Intel(R) IOP: ( %s%s%s%s%s%s)\n",
1429 dma_has_cap(DMA_PQ, dma_dev->cap_mask) ? "pq " : "",
1430 dma_has_cap(DMA_PQ_VAL, dma_dev->cap_mask) ? "pq_val " : "",
1431 dma_has_cap(DMA_XOR, dma_dev->cap_mask) ? "xor " : "",
1432 dma_has_cap(DMA_XOR_VAL, dma_dev->cap_mask) ? "xor_val " : "",
1433 dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask) ? "cpy " : "",
1434 dma_has_cap(DMA_INTERRUPT, dma_dev->cap_mask) ? "intr " : "");
1435
1436 dma_async_device_register(dma_dev);
1437 goto out;
1438
1439 err_free_iop_chan:
1440 kfree(iop_chan);
1441 err_free_dma:
1442 dma_free_coherent(&adev->pdev->dev, plat_data->pool_size,
1443 adev->dma_desc_pool_virt, adev->dma_desc_pool);
1444 err_free_adev:
1445 kfree(adev);
1446 out:
1447 return ret;
1448 }
1449
1450 static void iop_chan_start_null_memcpy(struct iop_adma_chan *iop_chan)
1451 {
1452 struct iop_adma_desc_slot *sw_desc, *grp_start;
1453 dma_cookie_t cookie;
1454 int slot_cnt, slots_per_op;
1455
1456 dev_dbg(iop_chan->device->common.dev, "%s\n", __func__);
1457
1458 spin_lock_bh(&iop_chan->lock);
1459 slot_cnt = iop_chan_memcpy_slot_count(0, &slots_per_op);
1460 sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
1461 if (sw_desc) {
1462 grp_start = sw_desc->group_head;
1463
1464 list_splice_init(&sw_desc->tx_list, &iop_chan->chain);
1465 async_tx_ack(&sw_desc->async_tx);
1466 iop_desc_init_memcpy(grp_start, 0);
1467 iop_desc_set_byte_count(grp_start, iop_chan, 0);
1468 iop_desc_set_dest_addr(grp_start, iop_chan, 0);
1469 iop_desc_set_memcpy_src_addr(grp_start, 0);
1470
1471 cookie = dma_cookie_assign(&sw_desc->async_tx);
1472
1473 /* initialize the completed cookie to be less than
1474 * the most recently used cookie
1475 */
1476 iop_chan->common.completed_cookie = cookie - 1;
1477
1478 /* channel should not be busy */
1479 BUG_ON(iop_chan_is_busy(iop_chan));
1480
1481 /* clear any prior error-status bits */
1482 iop_adma_device_clear_err_status(iop_chan);
1483
1484 /* disable operation */
1485 iop_chan_disable(iop_chan);
1486
1487 /* set the descriptor address */
1488 iop_chan_set_next_descriptor(iop_chan, sw_desc->async_tx.phys);
1489
1490 /* 1/ don't add pre-chained descriptors
1491 * 2/ dummy read to flush next_desc write
1492 */
1493 BUG_ON(iop_desc_get_next_desc(sw_desc));
1494
1495 /* run the descriptor */
1496 iop_chan_enable(iop_chan);
1497 } else
1498 dev_err(iop_chan->device->common.dev,
1499 "failed to allocate null descriptor\n");
1500 spin_unlock_bh(&iop_chan->lock);
1501 }
1502
1503 static void iop_chan_start_null_xor(struct iop_adma_chan *iop_chan)
1504 {
1505 struct iop_adma_desc_slot *sw_desc, *grp_start;
1506 dma_cookie_t cookie;
1507 int slot_cnt, slots_per_op;
1508
1509 dev_dbg(iop_chan->device->common.dev, "%s\n", __func__);
1510
1511 spin_lock_bh(&iop_chan->lock);
1512 slot_cnt = iop_chan_xor_slot_count(0, 2, &slots_per_op);
1513 sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
1514 if (sw_desc) {
1515 grp_start = sw_desc->group_head;
1516 list_splice_init(&sw_desc->tx_list, &iop_chan->chain);
1517 async_tx_ack(&sw_desc->async_tx);
1518 iop_desc_init_null_xor(grp_start, 2, 0);
1519 iop_desc_set_byte_count(grp_start, iop_chan, 0);
1520 iop_desc_set_dest_addr(grp_start, iop_chan, 0);
1521 iop_desc_set_xor_src_addr(grp_start, 0, 0);
1522 iop_desc_set_xor_src_addr(grp_start, 1, 0);
1523
1524 cookie = dma_cookie_assign(&sw_desc->async_tx);
1525
1526 /* initialize the completed cookie to be less than
1527 * the most recently used cookie
1528 */
1529 iop_chan->common.completed_cookie = cookie - 1;
1530
1531 /* channel should not be busy */
1532 BUG_ON(iop_chan_is_busy(iop_chan));
1533
1534 /* clear any prior error-status bits */
1535 iop_adma_device_clear_err_status(iop_chan);
1536
1537 /* disable operation */
1538 iop_chan_disable(iop_chan);
1539
1540 /* set the descriptor address */
1541 iop_chan_set_next_descriptor(iop_chan, sw_desc->async_tx.phys);
1542
1543 /* 1/ don't add pre-chained descriptors
1544 * 2/ dummy read to flush next_desc write
1545 */
1546 BUG_ON(iop_desc_get_next_desc(sw_desc));
1547
1548 /* run the descriptor */
1549 iop_chan_enable(iop_chan);
1550 } else
1551 dev_err(iop_chan->device->common.dev,
1552 "failed to allocate null descriptor\n");
1553 spin_unlock_bh(&iop_chan->lock);
1554 }
1555
1556 static struct platform_driver iop_adma_driver = {
1557 .probe = iop_adma_probe,
1558 .remove = iop_adma_remove,
1559 .driver = {
1560 .owner = THIS_MODULE,
1561 .name = "iop-adma",
1562 },
1563 };
1564
1565 module_platform_driver(iop_adma_driver);
1566
1567 MODULE_AUTHOR("Intel Corporation");
1568 MODULE_DESCRIPTION("IOP ADMA Engine Driver");
1569 MODULE_LICENSE("GPL");
1570 MODULE_ALIAS("platform:iop-adma");
Linux with added FPC-III support