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sched: make early bootup sched_clock() use safer
[wrt350n-kernel.git] / drivers / dma / iop-adma.c
blob3986d54492bde18d2b0d45d2e64a449dac5af227
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/async_tx.h>
28 #include <linux/delay.h>
29 #include <linux/dma-mapping.h>
30 #include <linux/spinlock.h>
31 #include <linux/interrupt.h>
32 #include <linux/platform_device.h>
33 #include <linux/memory.h>
34 #include <linux/ioport.h>
35
36 #include <asm/arch/adma.h>
37
38 #define to_iop_adma_chan(chan) container_of(chan, struct iop_adma_chan, common)
39 #define to_iop_adma_device(dev) \
40 container_of(dev, struct iop_adma_device, common)
41 #define tx_to_iop_adma_slot(tx) \
42 container_of(tx, struct iop_adma_desc_slot, async_tx)
43
44 /**
45 * iop_adma_free_slots - flags descriptor slots for reuse
46 * @slot: Slot to free
47 * Caller must hold &iop_chan->lock while calling this function
48 */
49 static void iop_adma_free_slots(struct iop_adma_desc_slot *slot)
50 {
51 int stride = slot->slots_per_op;
52
53 while (stride--) {
54 slot->slots_per_op = 0;
55 slot = list_entry(slot->slot_node.next,
56 struct iop_adma_desc_slot,
57 slot_node);
58 }
59 }
60
61 static dma_cookie_t
62 iop_adma_run_tx_complete_actions(struct iop_adma_desc_slot *desc,
63 struct iop_adma_chan *iop_chan, dma_cookie_t cookie)
64 {
65 BUG_ON(desc->async_tx.cookie < 0);
66 spin_lock_bh(&desc->async_tx.lock);
67 if (desc->async_tx.cookie > 0) {
68 cookie = desc->async_tx.cookie;
69 desc->async_tx.cookie = 0;
70
71 /* call the callback (must not sleep or submit new
72 * operations to this channel)
73 */
74 if (desc->async_tx.callback)
75 desc->async_tx.callback(
76 desc->async_tx.callback_param);
77
78 /* unmap dma addresses
79 * (unmap_single vs unmap_page?)
80 */
81 if (desc->group_head && desc->unmap_len) {
82 struct iop_adma_desc_slot *unmap = desc->group_head;
83 struct device *dev =
84 &iop_chan->device->pdev->dev;
85 u32 len = unmap->unmap_len;
86 u32 src_cnt = unmap->unmap_src_cnt;
87 dma_addr_t addr = iop_desc_get_dest_addr(unmap,
88 iop_chan);
89
90 dma_unmap_page(dev, addr, len, DMA_FROM_DEVICE);
91 while (src_cnt--) {
92 addr = iop_desc_get_src_addr(unmap,
93 iop_chan,
94 src_cnt);
95 dma_unmap_page(dev, addr, len,
96 DMA_TO_DEVICE);
97 }
98 desc->group_head = NULL;
99 }
100 }
101
102 /* run dependent operations */
103 async_tx_run_dependencies(&desc->async_tx);
104 spin_unlock_bh(&desc->async_tx.lock);
105
106 return cookie;
107 }
108
109 static int
110 iop_adma_clean_slot(struct iop_adma_desc_slot *desc,
111 struct iop_adma_chan *iop_chan)
112 {
113 /* the client is allowed to attach dependent operations
114 * until 'ack' is set
115 */
116 if (!desc->async_tx.ack)
117 return 0;
118
119 /* leave the last descriptor in the chain
120 * so we can append to it
121 */
122 if (desc->chain_node.next == &iop_chan->chain)
123 return 1;
124
125 dev_dbg(iop_chan->device->common.dev,
126 "\tfree slot: %d slots_per_op: %d\n",
127 desc->idx, desc->slots_per_op);
128
129 list_del(&desc->chain_node);
130 iop_adma_free_slots(desc);
131
132 return 0;
133 }
134
135 static void __iop_adma_slot_cleanup(struct iop_adma_chan *iop_chan)
136 {
137 struct iop_adma_desc_slot *iter, *_iter, *grp_start = NULL;
138 dma_cookie_t cookie = 0;
139 u32 current_desc = iop_chan_get_current_descriptor(iop_chan);
140 int busy = iop_chan_is_busy(iop_chan);
141 int seen_current = 0, slot_cnt = 0, slots_per_op = 0;
142
143 dev_dbg(iop_chan->device->common.dev, "%s\n", __FUNCTION__);
144 /* free completed slots from the chain starting with
145 * the oldest descriptor
146 */
147 list_for_each_entry_safe(iter, _iter, &iop_chan->chain,
148 chain_node) {
149 pr_debug("\tcookie: %d slot: %d busy: %d "
150 "this_desc: %#x next_desc: %#x ack: %d\n",
151 iter->async_tx.cookie, iter->idx, busy,
152 iter->async_tx.phys, iop_desc_get_next_desc(iter),
153 iter->async_tx.ack);
154 prefetch(_iter);
155 prefetch(&_iter->async_tx);
156
157 /* do not advance past the current descriptor loaded into the
158 * hardware channel, subsequent descriptors are either in
159 * process or have not been submitted
160 */
161 if (seen_current)
162 break;
163
164 /* stop the search if we reach the current descriptor and the
165 * channel is busy, or if it appears that the current descriptor
166 * needs to be re-read (i.e. has been appended to)
167 */
168 if (iter->async_tx.phys == current_desc) {
169 BUG_ON(seen_current++);
170 if (busy || iop_desc_get_next_desc(iter))
171 break;
172 }
173
174 /* detect the start of a group transaction */
175 if (!slot_cnt && !slots_per_op) {
176 slot_cnt = iter->slot_cnt;
177 slots_per_op = iter->slots_per_op;
178 if (slot_cnt <= slots_per_op) {
179 slot_cnt = 0;
180 slots_per_op = 0;
181 }
182 }
183
184 if (slot_cnt) {
185 pr_debug("\tgroup++\n");
186 if (!grp_start)
187 grp_start = iter;
188 slot_cnt -= slots_per_op;
189 }
190
191 /* all the members of a group are complete */
192 if (slots_per_op != 0 && slot_cnt == 0) {
193 struct iop_adma_desc_slot *grp_iter, *_grp_iter;
194 int end_of_chain = 0;
195 pr_debug("\tgroup end\n");
196
197 /* collect the total results */
198 if (grp_start->xor_check_result) {
199 u32 zero_sum_result = 0;
200 slot_cnt = grp_start->slot_cnt;
201 grp_iter = grp_start;
202
203 list_for_each_entry_from(grp_iter,
204 &iop_chan->chain, chain_node) {
205 zero_sum_result |=
206 iop_desc_get_zero_result(grp_iter);
207 pr_debug("\titer%d result: %d\n",
208 grp_iter->idx, zero_sum_result);
209 slot_cnt -= slots_per_op;
210 if (slot_cnt == 0)
211 break;
212 }
213 pr_debug("\tgrp_start->xor_check_result: %p\n",
214 grp_start->xor_check_result);
215 *grp_start->xor_check_result = zero_sum_result;
216 }
217
218 /* clean up the group */
219 slot_cnt = grp_start->slot_cnt;
220 grp_iter = grp_start;
221 list_for_each_entry_safe_from(grp_iter, _grp_iter,
222 &iop_chan->chain, chain_node) {
223 cookie = iop_adma_run_tx_complete_actions(
224 grp_iter, iop_chan, cookie);
225
226 slot_cnt -= slots_per_op;
227 end_of_chain = iop_adma_clean_slot(grp_iter,
228 iop_chan);
229
230 if (slot_cnt == 0 || end_of_chain)
231 break;
232 }
233
234 /* the group should be complete at this point */
235 BUG_ON(slot_cnt);
236
237 slots_per_op = 0;
238 grp_start = NULL;
239 if (end_of_chain)
240 break;
241 else
242 continue;
243 } else if (slots_per_op) /* wait for group completion */
244 continue;
245
246 /* write back zero sum results (single descriptor case) */
247 if (iter->xor_check_result && iter->async_tx.cookie)
248 *iter->xor_check_result =
249 iop_desc_get_zero_result(iter);
250
251 cookie = iop_adma_run_tx_complete_actions(
252 iter, iop_chan, cookie);
253
254 if (iop_adma_clean_slot(iter, iop_chan))
255 break;
256 }
257
258 BUG_ON(!seen_current);
259
260 iop_chan_idle(busy, iop_chan);
261
262 if (cookie > 0) {
263 iop_chan->completed_cookie = cookie;
264 pr_debug("\tcompleted cookie %d\n", cookie);
265 }
266 }
267
268 static void
269 iop_adma_slot_cleanup(struct iop_adma_chan *iop_chan)
270 {
271 spin_lock_bh(&iop_chan->lock);
272 __iop_adma_slot_cleanup(iop_chan);
273 spin_unlock_bh(&iop_chan->lock);
274 }
275
276 static void iop_adma_tasklet(unsigned long data)
277 {
278 struct iop_adma_chan *chan = (struct iop_adma_chan *) data;
279 __iop_adma_slot_cleanup(chan);
280 }
281
282 static struct iop_adma_desc_slot *
283 iop_adma_alloc_slots(struct iop_adma_chan *iop_chan, int num_slots,
284 int slots_per_op)
285 {
286 struct iop_adma_desc_slot *iter, *_iter, *alloc_start = NULL;
287 LIST_HEAD(chain);
288 int slots_found, retry = 0;
289
290 /* start search from the last allocated descrtiptor
291 * if a contiguous allocation can not be found start searching
292 * from the beginning of the list
293 */
294 retry:
295 slots_found = 0;
296 if (retry == 0)
297 iter = iop_chan->last_used;
298 else
299 iter = list_entry(&iop_chan->all_slots,
300 struct iop_adma_desc_slot,
301 slot_node);
302
303 list_for_each_entry_safe_continue(
304 iter, _iter, &iop_chan->all_slots, slot_node) {
305 prefetch(_iter);
306 prefetch(&_iter->async_tx);
307 if (iter->slots_per_op) {
308 /* give up after finding the first busy slot
309 * on the second pass through the list
310 */
311 if (retry)
312 break;
313
314 slots_found = 0;
315 continue;
316 }
317
318 /* start the allocation if the slot is correctly aligned */
319 if (!slots_found++) {
320 if (iop_desc_is_aligned(iter, slots_per_op))
321 alloc_start = iter;
322 else {
323 slots_found = 0;
324 continue;
325 }
326 }
327
328 if (slots_found == num_slots) {
329 struct iop_adma_desc_slot *alloc_tail = NULL;
330 struct iop_adma_desc_slot *last_used = NULL;
331 iter = alloc_start;
332 while (num_slots) {
333 int i;
334 dev_dbg(iop_chan->device->common.dev,
335 "allocated slot: %d "
336 "(desc %p phys: %#x) slots_per_op %d\n",
337 iter->idx, iter->hw_desc,
338 iter->async_tx.phys, slots_per_op);
339
340 /* pre-ack all but the last descriptor */
341 if (num_slots != slots_per_op)
342 iter->async_tx.ack = 1;
343 else
344 iter->async_tx.ack = 0;
345
346 list_add_tail(&iter->chain_node, &chain);
347 alloc_tail = iter;
348 iter->async_tx.cookie = 0;
349 iter->slot_cnt = num_slots;
350 iter->xor_check_result = NULL;
351 for (i = 0; i < slots_per_op; i++) {
352 iter->slots_per_op = slots_per_op - i;
353 last_used = iter;
354 iter = list_entry(iter->slot_node.next,
355 struct iop_adma_desc_slot,
356 slot_node);
357 }
358 num_slots -= slots_per_op;
359 }
360 alloc_tail->group_head = alloc_start;
361 alloc_tail->async_tx.cookie = -EBUSY;
362 list_splice(&chain, &alloc_tail->async_tx.tx_list);
363 iop_chan->last_used = last_used;
364 iop_desc_clear_next_desc(alloc_start);
365 iop_desc_clear_next_desc(alloc_tail);
366 return alloc_tail;
367 }
368 }
369 if (!retry++)
370 goto retry;
371
372 /* try to free some slots if the allocation fails */
373 tasklet_schedule(&iop_chan->irq_tasklet);
374
375 return NULL;
376 }
377
378 static dma_cookie_t
379 iop_desc_assign_cookie(struct iop_adma_chan *iop_chan,
380 struct iop_adma_desc_slot *desc)
381 {
382 dma_cookie_t cookie = iop_chan->common.cookie;
383 cookie++;
384 if (cookie < 0)
385 cookie = 1;
386 iop_chan->common.cookie = desc->async_tx.cookie = cookie;
387 return cookie;
388 }
389
390 static void iop_adma_check_threshold(struct iop_adma_chan *iop_chan)
391 {
392 dev_dbg(iop_chan->device->common.dev, "pending: %d\n",
393 iop_chan->pending);
394
395 if (iop_chan->pending >= IOP_ADMA_THRESHOLD) {
396 iop_chan->pending = 0;
397 iop_chan_append(iop_chan);
398 }
399 }
400
401 static dma_cookie_t
402 iop_adma_tx_submit(struct dma_async_tx_descriptor *tx)
403 {
404 struct iop_adma_desc_slot *sw_desc = tx_to_iop_adma_slot(tx);
405 struct iop_adma_chan *iop_chan = to_iop_adma_chan(tx->chan);
406 struct iop_adma_desc_slot *grp_start, *old_chain_tail;
407 int slot_cnt;
408 int slots_per_op;
409 dma_cookie_t cookie;
410
411 grp_start = sw_desc->group_head;
412 slot_cnt = grp_start->slot_cnt;
413 slots_per_op = grp_start->slots_per_op;
414
415 spin_lock_bh(&iop_chan->lock);
416 cookie = iop_desc_assign_cookie(iop_chan, sw_desc);
417
418 old_chain_tail = list_entry(iop_chan->chain.prev,
419 struct iop_adma_desc_slot, chain_node);
420 list_splice_init(&sw_desc->async_tx.tx_list,
421 &old_chain_tail->chain_node);
422
423 /* fix up the hardware chain */
424 iop_desc_set_next_desc(old_chain_tail, grp_start->async_tx.phys);
425
426 /* 1/ don't add pre-chained descriptors
427 * 2/ dummy read to flush next_desc write
428 */
429 BUG_ON(iop_desc_get_next_desc(sw_desc));
430
431 /* increment the pending count by the number of slots
432 * memcpy operations have a 1:1 (slot:operation) relation
433 * other operations are heavier and will pop the threshold
434 * more often.
435 */
436 iop_chan->pending += slot_cnt;
437 iop_adma_check_threshold(iop_chan);
438 spin_unlock_bh(&iop_chan->lock);
439
440 dev_dbg(iop_chan->device->common.dev, "%s cookie: %d slot: %d\n",
441 __FUNCTION__, sw_desc->async_tx.cookie, sw_desc->idx);
442
443 return cookie;
444 }
445
446 static void iop_chan_start_null_memcpy(struct iop_adma_chan *iop_chan);
447 static void iop_chan_start_null_xor(struct iop_adma_chan *iop_chan);
448
449 /* returns the number of allocated descriptors */
450 static int iop_adma_alloc_chan_resources(struct dma_chan *chan)
451 {
452 char *hw_desc;
453 int idx;
454 struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
455 struct iop_adma_desc_slot *slot = NULL;
456 int init = iop_chan->slots_allocated ? 0 : 1;
457 struct iop_adma_platform_data *plat_data =
458 iop_chan->device->pdev->dev.platform_data;
459 int num_descs_in_pool = plat_data->pool_size/IOP_ADMA_SLOT_SIZE;
460
461 /* Allocate descriptor slots */
462 do {
463 idx = iop_chan->slots_allocated;
464 if (idx == num_descs_in_pool)
465 break;
466
467 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
468 if (!slot) {
469 printk(KERN_INFO "IOP ADMA Channel only initialized"
470 " %d descriptor slots", idx);
471 break;
472 }
473 hw_desc = (char *) iop_chan->device->dma_desc_pool_virt;
474 slot->hw_desc = (void *) &hw_desc[idx * IOP_ADMA_SLOT_SIZE];
475
476 dma_async_tx_descriptor_init(&slot->async_tx, chan);
477 slot->async_tx.tx_submit = iop_adma_tx_submit;
478 INIT_LIST_HEAD(&slot->chain_node);
479 INIT_LIST_HEAD(&slot->slot_node);
480 INIT_LIST_HEAD(&slot->async_tx.tx_list);
481 hw_desc = (char *) iop_chan->device->dma_desc_pool;
482 slot->async_tx.phys =
483 (dma_addr_t) &hw_desc[idx * IOP_ADMA_SLOT_SIZE];
484 slot->idx = idx;
485
486 spin_lock_bh(&iop_chan->lock);
487 iop_chan->slots_allocated++;
488 list_add_tail(&slot->slot_node, &iop_chan->all_slots);
489 spin_unlock_bh(&iop_chan->lock);
490 } while (iop_chan->slots_allocated < num_descs_in_pool);
491
492 if (idx && !iop_chan->last_used)
493 iop_chan->last_used = list_entry(iop_chan->all_slots.next,
494 struct iop_adma_desc_slot,
495 slot_node);
496
497 dev_dbg(iop_chan->device->common.dev,
498 "allocated %d descriptor slots last_used: %p\n",
499 iop_chan->slots_allocated, iop_chan->last_used);
500
501 /* initialize the channel and the chain with a null operation */
502 if (init) {
503 if (dma_has_cap(DMA_MEMCPY,
504 iop_chan->device->common.cap_mask))
505 iop_chan_start_null_memcpy(iop_chan);
506 else if (dma_has_cap(DMA_XOR,
507 iop_chan->device->common.cap_mask))
508 iop_chan_start_null_xor(iop_chan);
509 else
510 BUG();
511 }
512
513 return (idx > 0) ? idx : -ENOMEM;
514 }
515
516 static struct dma_async_tx_descriptor *
517 iop_adma_prep_dma_interrupt(struct dma_chan *chan)
518 {
519 struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
520 struct iop_adma_desc_slot *sw_desc, *grp_start;
521 int slot_cnt, slots_per_op;
522
523 dev_dbg(iop_chan->device->common.dev, "%s\n", __FUNCTION__);
524
525 spin_lock_bh(&iop_chan->lock);
526 slot_cnt = iop_chan_interrupt_slot_count(&slots_per_op, iop_chan);
527 sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
528 if (sw_desc) {
529 grp_start = sw_desc->group_head;
530 iop_desc_init_interrupt(grp_start, iop_chan);
531 grp_start->unmap_len = 0;
532 }
533 spin_unlock_bh(&iop_chan->lock);
534
535 return sw_desc ? &sw_desc->async_tx : NULL;
536 }
537
538 static struct dma_async_tx_descriptor *
539 iop_adma_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dma_dest,
540 dma_addr_t dma_src, size_t len, unsigned long flags)
541 {
542 struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
543 struct iop_adma_desc_slot *sw_desc, *grp_start;
544 int slot_cnt, slots_per_op;
545
546 if (unlikely(!len))
547 return NULL;
548 BUG_ON(unlikely(len > IOP_ADMA_MAX_BYTE_COUNT));
549
550 dev_dbg(iop_chan->device->common.dev, "%s len: %u\n",
551 __FUNCTION__, len);
552
553 spin_lock_bh(&iop_chan->lock);
554 slot_cnt = iop_chan_memcpy_slot_count(len, &slots_per_op);
555 sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
556 if (sw_desc) {
557 grp_start = sw_desc->group_head;
558 iop_desc_init_memcpy(grp_start, flags);
559 iop_desc_set_byte_count(grp_start, iop_chan, len);
560 iop_desc_set_dest_addr(grp_start, iop_chan, dma_dest);
561 iop_desc_set_memcpy_src_addr(grp_start, dma_src);
562 sw_desc->unmap_src_cnt = 1;
563 sw_desc->unmap_len = len;
564 }
565 spin_unlock_bh(&iop_chan->lock);
566
567 return sw_desc ? &sw_desc->async_tx : NULL;
568 }
569
570 static struct dma_async_tx_descriptor *
571 iop_adma_prep_dma_memset(struct dma_chan *chan, dma_addr_t dma_dest,
572 int value, size_t len, unsigned long flags)
573 {
574 struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
575 struct iop_adma_desc_slot *sw_desc, *grp_start;
576 int slot_cnt, slots_per_op;
577
578 if (unlikely(!len))
579 return NULL;
580 BUG_ON(unlikely(len > IOP_ADMA_MAX_BYTE_COUNT));
581
582 dev_dbg(iop_chan->device->common.dev, "%s len: %u\n",
583 __FUNCTION__, len);
584
585 spin_lock_bh(&iop_chan->lock);
586 slot_cnt = iop_chan_memset_slot_count(len, &slots_per_op);
587 sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
588 if (sw_desc) {
589 grp_start = sw_desc->group_head;
590 iop_desc_init_memset(grp_start, flags);
591 iop_desc_set_byte_count(grp_start, iop_chan, len);
592 iop_desc_set_block_fill_val(grp_start, value);
593 iop_desc_set_dest_addr(grp_start, iop_chan, dma_dest);
594 sw_desc->unmap_src_cnt = 1;
595 sw_desc->unmap_len = len;
596 }
597 spin_unlock_bh(&iop_chan->lock);
598
599 return sw_desc ? &sw_desc->async_tx : NULL;
600 }
601
602 static struct dma_async_tx_descriptor *
603 iop_adma_prep_dma_xor(struct dma_chan *chan, dma_addr_t dma_dest,
604 dma_addr_t *dma_src, unsigned int src_cnt, size_t len,
605 unsigned long flags)
606 {
607 struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
608 struct iop_adma_desc_slot *sw_desc, *grp_start;
609 int slot_cnt, slots_per_op;
610
611 if (unlikely(!len))
612 return NULL;
613 BUG_ON(unlikely(len > IOP_ADMA_XOR_MAX_BYTE_COUNT));
614
615 dev_dbg(iop_chan->device->common.dev,
616 "%s src_cnt: %d len: %u flags: %lx\n",
617 __FUNCTION__, src_cnt, len, flags);
618
619 spin_lock_bh(&iop_chan->lock);
620 slot_cnt = iop_chan_xor_slot_count(len, src_cnt, &slots_per_op);
621 sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
622 if (sw_desc) {
623 grp_start = sw_desc->group_head;
624 iop_desc_init_xor(grp_start, src_cnt, flags);
625 iop_desc_set_byte_count(grp_start, iop_chan, len);
626 iop_desc_set_dest_addr(grp_start, iop_chan, dma_dest);
627 sw_desc->unmap_src_cnt = src_cnt;
628 sw_desc->unmap_len = len;
629 while (src_cnt--)
630 iop_desc_set_xor_src_addr(grp_start, src_cnt,
631 dma_src[src_cnt]);
632 }
633 spin_unlock_bh(&iop_chan->lock);
634
635 return sw_desc ? &sw_desc->async_tx : NULL;
636 }
637
638 static struct dma_async_tx_descriptor *
639 iop_adma_prep_dma_zero_sum(struct dma_chan *chan, dma_addr_t *dma_src,
640 unsigned int src_cnt, size_t len, u32 *result,
641 unsigned long flags)
642 {
643 struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
644 struct iop_adma_desc_slot *sw_desc, *grp_start;
645 int slot_cnt, slots_per_op;
646
647 if (unlikely(!len))
648 return NULL;
649
650 dev_dbg(iop_chan->device->common.dev, "%s src_cnt: %d len: %u\n",
651 __FUNCTION__, src_cnt, len);
652
653 spin_lock_bh(&iop_chan->lock);
654 slot_cnt = iop_chan_zero_sum_slot_count(len, src_cnt, &slots_per_op);
655 sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
656 if (sw_desc) {
657 grp_start = sw_desc->group_head;
658 iop_desc_init_zero_sum(grp_start, src_cnt, flags);
659 iop_desc_set_zero_sum_byte_count(grp_start, len);
660 grp_start->xor_check_result = result;
661 pr_debug("\t%s: grp_start->xor_check_result: %p\n",
662 __FUNCTION__, grp_start->xor_check_result);
663 sw_desc->unmap_src_cnt = src_cnt;
664 sw_desc->unmap_len = len;
665 while (src_cnt--)
666 iop_desc_set_zero_sum_src_addr(grp_start, src_cnt,
667 dma_src[src_cnt]);
668 }
669 spin_unlock_bh(&iop_chan->lock);
670
671 return sw_desc ? &sw_desc->async_tx : NULL;
672 }
673
674 static void iop_adma_dependency_added(struct dma_chan *chan)
675 {
676 struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
677 tasklet_schedule(&iop_chan->irq_tasklet);
678 }
679
680 static void iop_adma_free_chan_resources(struct dma_chan *chan)
681 {
682 struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
683 struct iop_adma_desc_slot *iter, *_iter;
684 int in_use_descs = 0;
685
686 iop_adma_slot_cleanup(iop_chan);
687
688 spin_lock_bh(&iop_chan->lock);
689 list_for_each_entry_safe(iter, _iter, &iop_chan->chain,
690 chain_node) {
691 in_use_descs++;
692 list_del(&iter->chain_node);
693 }
694 list_for_each_entry_safe_reverse(
695 iter, _iter, &iop_chan->all_slots, slot_node) {
696 list_del(&iter->slot_node);
697 kfree(iter);
698 iop_chan->slots_allocated--;
699 }
700 iop_chan->last_used = NULL;
701
702 dev_dbg(iop_chan->device->common.dev, "%s slots_allocated %d\n",
703 __FUNCTION__, iop_chan->slots_allocated);
704 spin_unlock_bh(&iop_chan->lock);
705
706 /* one is ok since we left it on there on purpose */
707 if (in_use_descs > 1)
708 printk(KERN_ERR "IOP: Freeing %d in use descriptors!\n",
709 in_use_descs - 1);
710 }
711
712 /**
713 * iop_adma_is_complete - poll the status of an ADMA transaction
714 * @chan: ADMA channel handle
715 * @cookie: ADMA transaction identifier
716 */
717 static enum dma_status iop_adma_is_complete(struct dma_chan *chan,
718 dma_cookie_t cookie,
719 dma_cookie_t *done,
720 dma_cookie_t *used)
721 {
722 struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
723 dma_cookie_t last_used;
724 dma_cookie_t last_complete;
725 enum dma_status ret;
726
727 last_used = chan->cookie;
728 last_complete = iop_chan->completed_cookie;
729
730 if (done)
731 *done = last_complete;
732 if (used)
733 *used = last_used;
734
735 ret = dma_async_is_complete(cookie, last_complete, last_used);
736 if (ret == DMA_SUCCESS)
737 return ret;
738
739 iop_adma_slot_cleanup(iop_chan);
740
741 last_used = chan->cookie;
742 last_complete = iop_chan->completed_cookie;
743
744 if (done)
745 *done = last_complete;
746 if (used)
747 *used = last_used;
748
749 return dma_async_is_complete(cookie, last_complete, last_used);
750 }
751
752 static irqreturn_t iop_adma_eot_handler(int irq, void *data)
753 {
754 struct iop_adma_chan *chan = data;
755
756 dev_dbg(chan->device->common.dev, "%s\n", __FUNCTION__);
757
758 tasklet_schedule(&chan->irq_tasklet);
759
760 iop_adma_device_clear_eot_status(chan);
761
762 return IRQ_HANDLED;
763 }
764
765 static irqreturn_t iop_adma_eoc_handler(int irq, void *data)
766 {
767 struct iop_adma_chan *chan = data;
768
769 dev_dbg(chan->device->common.dev, "%s\n", __FUNCTION__);
770
771 tasklet_schedule(&chan->irq_tasklet);
772
773 iop_adma_device_clear_eoc_status(chan);
774
775 return IRQ_HANDLED;
776 }
777
778 static irqreturn_t iop_adma_err_handler(int irq, void *data)
779 {
780 struct iop_adma_chan *chan = data;
781 unsigned long status = iop_chan_get_status(chan);
782
783 dev_printk(KERN_ERR, chan->device->common.dev,
784 "error ( %s%s%s%s%s%s%s)\n",
785 iop_is_err_int_parity(status, chan) ? "int_parity " : "",
786 iop_is_err_mcu_abort(status, chan) ? "mcu_abort " : "",
787 iop_is_err_int_tabort(status, chan) ? "int_tabort " : "",
788 iop_is_err_int_mabort(status, chan) ? "int_mabort " : "",
789 iop_is_err_pci_tabort(status, chan) ? "pci_tabort " : "",
790 iop_is_err_pci_mabort(status, chan) ? "pci_mabort " : "",
791 iop_is_err_split_tx(status, chan) ? "split_tx " : "");
792
793 iop_adma_device_clear_err_status(chan);
794
795 BUG();
796
797 return IRQ_HANDLED;
798 }
799
800 static void iop_adma_issue_pending(struct dma_chan *chan)
801 {
802 struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
803
804 if (iop_chan->pending) {
805 iop_chan->pending = 0;
806 iop_chan_append(iop_chan);
807 }
808 }
809
810 /*
811 * Perform a transaction to verify the HW works.
812 */
813 #define IOP_ADMA_TEST_SIZE 2000
814
815 static int __devinit iop_adma_memcpy_self_test(struct iop_adma_device *device)
816 {
817 int i;
818 void *src, *dest;
819 dma_addr_t src_dma, dest_dma;
820 struct dma_chan *dma_chan;
821 dma_cookie_t cookie;
822 struct dma_async_tx_descriptor *tx;
823 int err = 0;
824 struct iop_adma_chan *iop_chan;
825
826 dev_dbg(device->common.dev, "%s\n", __FUNCTION__);
827
828 src = kzalloc(sizeof(u8) * IOP_ADMA_TEST_SIZE, GFP_KERNEL);
829 if (!src)
830 return -ENOMEM;
831 dest = kzalloc(sizeof(u8) * IOP_ADMA_TEST_SIZE, GFP_KERNEL);
832 if (!dest) {
833 kfree(src);
834 return -ENOMEM;
835 }
836
837 /* Fill in src buffer */
838 for (i = 0; i < IOP_ADMA_TEST_SIZE; i++)
839 ((u8 *) src)[i] = (u8)i;
840
841 memset(dest, 0, IOP_ADMA_TEST_SIZE);
842
843 /* Start copy, using first DMA channel */
844 dma_chan = container_of(device->common.channels.next,
845 struct dma_chan,
846 device_node);
847 if (iop_adma_alloc_chan_resources(dma_chan) < 1) {
848 err = -ENODEV;
849 goto out;
850 }
851
852 dest_dma = dma_map_single(dma_chan->device->dev, dest,
853 IOP_ADMA_TEST_SIZE, DMA_FROM_DEVICE);
854 src_dma = dma_map_single(dma_chan->device->dev, src,
855 IOP_ADMA_TEST_SIZE, DMA_TO_DEVICE);
856 tx = iop_adma_prep_dma_memcpy(dma_chan, dest_dma, src_dma,
857 IOP_ADMA_TEST_SIZE, 1);
858
859 cookie = iop_adma_tx_submit(tx);
860 iop_adma_issue_pending(dma_chan);
861 async_tx_ack(tx);
862 msleep(1);
863
864 if (iop_adma_is_complete(dma_chan, cookie, NULL, NULL) !=
865 DMA_SUCCESS) {
866 dev_printk(KERN_ERR, dma_chan->device->dev,
867 "Self-test copy timed out, disabling\n");
868 err = -ENODEV;
869 goto free_resources;
870 }
871
872 iop_chan = to_iop_adma_chan(dma_chan);
873 dma_sync_single_for_cpu(&iop_chan->device->pdev->dev, dest_dma,
874 IOP_ADMA_TEST_SIZE, DMA_FROM_DEVICE);
875 if (memcmp(src, dest, IOP_ADMA_TEST_SIZE)) {
876 dev_printk(KERN_ERR, dma_chan->device->dev,
877 "Self-test copy failed compare, disabling\n");
878 err = -ENODEV;
879 goto free_resources;
880 }
881
882 free_resources:
883 iop_adma_free_chan_resources(dma_chan);
884 out:
885 kfree(src);
886 kfree(dest);
887 return err;
888 }
889
890 #define IOP_ADMA_NUM_SRC_TEST 4 /* must be <= 15 */
891 static int __devinit
892 iop_adma_xor_zero_sum_self_test(struct iop_adma_device *device)
893 {
894 int i, src_idx;
895 struct page *dest;
896 struct page *xor_srcs[IOP_ADMA_NUM_SRC_TEST];
897 struct page *zero_sum_srcs[IOP_ADMA_NUM_SRC_TEST + 1];
898 dma_addr_t dma_srcs[IOP_ADMA_NUM_SRC_TEST + 1];
899 dma_addr_t dma_addr, dest_dma;
900 struct dma_async_tx_descriptor *tx;
901 struct dma_chan *dma_chan;
902 dma_cookie_t cookie;
903 u8 cmp_byte = 0;
904 u32 cmp_word;
905 u32 zero_sum_result;
906 int err = 0;
907 struct iop_adma_chan *iop_chan;
908
909 dev_dbg(device->common.dev, "%s\n", __FUNCTION__);
910
911 for (src_idx = 0; src_idx < IOP_ADMA_NUM_SRC_TEST; src_idx++) {
912 xor_srcs[src_idx] = alloc_page(GFP_KERNEL);
913 if (!xor_srcs[src_idx])
914 while (src_idx--) {
915 __free_page(xor_srcs[src_idx]);
916 return -ENOMEM;
917 }
918 }
919
920 dest = alloc_page(GFP_KERNEL);
921 if (!dest)
922 while (src_idx--) {
923 __free_page(xor_srcs[src_idx]);
924 return -ENOMEM;
925 }
926
927 /* Fill in src buffers */
928 for (src_idx = 0; src_idx < IOP_ADMA_NUM_SRC_TEST; src_idx++) {
929 u8 *ptr = page_address(xor_srcs[src_idx]);
930 for (i = 0; i < PAGE_SIZE; i++)
931 ptr[i] = (1 << src_idx);
932 }
933
934 for (src_idx = 0; src_idx < IOP_ADMA_NUM_SRC_TEST; src_idx++)
935 cmp_byte ^= (u8) (1 << src_idx);
936
937 cmp_word = (cmp_byte << 24) | (cmp_byte << 16) |
938 (cmp_byte << 8) | cmp_byte;
939
940 memset(page_address(dest), 0, PAGE_SIZE);
941
942 dma_chan = container_of(device->common.channels.next,
943 struct dma_chan,
944 device_node);
945 if (iop_adma_alloc_chan_resources(dma_chan) < 1) {
946 err = -ENODEV;
947 goto out;
948 }
949
950 /* test xor */
951 dest_dma = dma_map_page(dma_chan->device->dev, dest, 0,
952 PAGE_SIZE, DMA_FROM_DEVICE);
953 for (i = 0; i < IOP_ADMA_NUM_SRC_TEST; i++)
954 dma_srcs[i] = dma_map_page(dma_chan->device->dev, xor_srcs[i],
955 0, PAGE_SIZE, DMA_TO_DEVICE);
956 tx = iop_adma_prep_dma_xor(dma_chan, dest_dma, dma_srcs,
957 IOP_ADMA_NUM_SRC_TEST, PAGE_SIZE, 1);
958
959 cookie = iop_adma_tx_submit(tx);
960 iop_adma_issue_pending(dma_chan);
961 async_tx_ack(tx);
962 msleep(8);
963
964 if (iop_adma_is_complete(dma_chan, cookie, NULL, NULL) !=
965 DMA_SUCCESS) {
966 dev_printk(KERN_ERR, dma_chan->device->dev,
967 "Self-test xor timed out, disabling\n");
968 err = -ENODEV;
969 goto free_resources;
970 }
971
972 iop_chan = to_iop_adma_chan(dma_chan);
973 dma_sync_single_for_cpu(&iop_chan->device->pdev->dev, dest_dma,
974 PAGE_SIZE, DMA_FROM_DEVICE);
975 for (i = 0; i < (PAGE_SIZE / sizeof(u32)); i++) {
976 u32 *ptr = page_address(dest);
977 if (ptr[i] != cmp_word) {
978 dev_printk(KERN_ERR, dma_chan->device->dev,
979 "Self-test xor failed compare, disabling\n");
980 err = -ENODEV;
981 goto free_resources;
982 }
983 }
984 dma_sync_single_for_device(&iop_chan->device->pdev->dev, dest_dma,
985 PAGE_SIZE, DMA_TO_DEVICE);
986
987 /* skip zero sum if the capability is not present */
988 if (!dma_has_cap(DMA_ZERO_SUM, dma_chan->device->cap_mask))
989 goto free_resources;
990
991 /* zero sum the sources with the destintation page */
992 for (i = 0; i < IOP_ADMA_NUM_SRC_TEST; i++)
993 zero_sum_srcs[i] = xor_srcs[i];
994 zero_sum_srcs[i] = dest;
995
996 zero_sum_result = 1;
997
998 for (i = 0; i < IOP_ADMA_NUM_SRC_TEST + 1; i++)
999 dma_srcs[i] = dma_map_page(dma_chan->device->dev,
1000 zero_sum_srcs[i], 0, PAGE_SIZE,
1001 DMA_TO_DEVICE);
1002 tx = iop_adma_prep_dma_zero_sum(dma_chan, dma_srcs,
1003 IOP_ADMA_NUM_SRC_TEST + 1, PAGE_SIZE,
1004 &zero_sum_result, 1);
1005
1006 cookie = iop_adma_tx_submit(tx);
1007 iop_adma_issue_pending(dma_chan);
1008 async_tx_ack(tx);
1009 msleep(8);
1010
1011 if (iop_adma_is_complete(dma_chan, cookie, NULL, NULL) != DMA_SUCCESS) {
1012 dev_printk(KERN_ERR, dma_chan->device->dev,
1013 "Self-test zero sum timed out, disabling\n");
1014 err = -ENODEV;
1015 goto free_resources;
1016 }
1017
1018 if (zero_sum_result != 0) {
1019 dev_printk(KERN_ERR, dma_chan->device->dev,
1020 "Self-test zero sum failed compare, disabling\n");
1021 err = -ENODEV;
1022 goto free_resources;
1023 }
1024
1025 /* test memset */
1026 dma_addr = dma_map_page(dma_chan->device->dev, dest, 0,
1027 PAGE_SIZE, DMA_FROM_DEVICE);
1028 tx = iop_adma_prep_dma_memset(dma_chan, dma_addr, 0, PAGE_SIZE, 1);
1029
1030 cookie = iop_adma_tx_submit(tx);
1031 iop_adma_issue_pending(dma_chan);
1032 async_tx_ack(tx);
1033 msleep(8);
1034
1035 if (iop_adma_is_complete(dma_chan, cookie, NULL, NULL) != DMA_SUCCESS) {
1036 dev_printk(KERN_ERR, dma_chan->device->dev,
1037 "Self-test memset timed out, disabling\n");
1038 err = -ENODEV;
1039 goto free_resources;
1040 }
1041
1042 for (i = 0; i < PAGE_SIZE/sizeof(u32); i++) {
1043 u32 *ptr = page_address(dest);
1044 if (ptr[i]) {
1045 dev_printk(KERN_ERR, dma_chan->device->dev,
1046 "Self-test memset failed compare, disabling\n");
1047 err = -ENODEV;
1048 goto free_resources;
1049 }
1050 }
1051
1052 /* test for non-zero parity sum */
1053 zero_sum_result = 0;
1054 for (i = 0; i < IOP_ADMA_NUM_SRC_TEST + 1; i++)
1055 dma_srcs[i] = dma_map_page(dma_chan->device->dev,
1056 zero_sum_srcs[i], 0, PAGE_SIZE,
1057 DMA_TO_DEVICE);
1058 tx = iop_adma_prep_dma_zero_sum(dma_chan, dma_srcs,
1059 IOP_ADMA_NUM_SRC_TEST + 1, PAGE_SIZE,
1060 &zero_sum_result, 1);
1061
1062 cookie = iop_adma_tx_submit(tx);
1063 iop_adma_issue_pending(dma_chan);
1064 async_tx_ack(tx);
1065 msleep(8);
1066
1067 if (iop_adma_is_complete(dma_chan, cookie, NULL, NULL) != DMA_SUCCESS) {
1068 dev_printk(KERN_ERR, dma_chan->device->dev,
1069 "Self-test non-zero sum timed out, disabling\n");
1070 err = -ENODEV;
1071 goto free_resources;
1072 }
1073
1074 if (zero_sum_result != 1) {
1075 dev_printk(KERN_ERR, dma_chan->device->dev,
1076 "Self-test non-zero sum failed compare, disabling\n");
1077 err = -ENODEV;
1078 goto free_resources;
1079 }
1080
1081 free_resources:
1082 iop_adma_free_chan_resources(dma_chan);
1083 out:
1084 src_idx = IOP_ADMA_NUM_SRC_TEST;
1085 while (src_idx--)
1086 __free_page(xor_srcs[src_idx]);
1087 __free_page(dest);
1088 return err;
1089 }
1090
1091 static int __devexit iop_adma_remove(struct platform_device *dev)
1092 {
1093 struct iop_adma_device *device = platform_get_drvdata(dev);
1094 struct dma_chan *chan, *_chan;
1095 struct iop_adma_chan *iop_chan;
1096 int i;
1097 struct iop_adma_platform_data *plat_data = dev->dev.platform_data;
1098
1099 dma_async_device_unregister(&device->common);
1100
1101 for (i = 0; i < 3; i++) {
1102 unsigned int irq;
1103 irq = platform_get_irq(dev, i);
1104 free_irq(irq, device);
1105 }
1106
1107 dma_free_coherent(&dev->dev, plat_data->pool_size,
1108 device->dma_desc_pool_virt, device->dma_desc_pool);
1109
1110 do {
1111 struct resource *res;
1112 res = platform_get_resource(dev, IORESOURCE_MEM, 0);
1113 release_mem_region(res->start, res->end - res->start);
1114 } while (0);
1115
1116 list_for_each_entry_safe(chan, _chan, &device->common.channels,
1117 device_node) {
1118 iop_chan = to_iop_adma_chan(chan);
1119 list_del(&chan->device_node);
1120 kfree(iop_chan);
1121 }
1122 kfree(device);
1123
1124 return 0;
1125 }
1126
1127 static int __devinit iop_adma_probe(struct platform_device *pdev)
1128 {
1129 struct resource *res;
1130 int ret = 0, i;
1131 struct iop_adma_device *adev;
1132 struct iop_adma_chan *iop_chan;
1133 struct dma_device *dma_dev;
1134 struct iop_adma_platform_data *plat_data = pdev->dev.platform_data;
1135
1136 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1137 if (!res)
1138 return -ENODEV;
1139
1140 if (!devm_request_mem_region(&pdev->dev, res->start,
1141 res->end - res->start, pdev->name))
1142 return -EBUSY;
1143
1144 adev = kzalloc(sizeof(*adev), GFP_KERNEL);
1145 if (!adev)
1146 return -ENOMEM;
1147 dma_dev = &adev->common;
1148
1149 /* allocate coherent memory for hardware descriptors
1150 * note: writecombine gives slightly better performance, but
1151 * requires that we explicitly flush the writes
1152 */
1153 if ((adev->dma_desc_pool_virt = dma_alloc_writecombine(&pdev->dev,
1154 plat_data->pool_size,
1155 &adev->dma_desc_pool,
1156 GFP_KERNEL)) == NULL) {
1157 ret = -ENOMEM;
1158 goto err_free_adev;
1159 }
1160
1161 dev_dbg(&pdev->dev, "%s: allocted descriptor pool virt %p phys %p\n",
1162 __FUNCTION__, adev->dma_desc_pool_virt,
1163 (void *) adev->dma_desc_pool);
1164
1165 adev->id = plat_data->hw_id;
1166
1167 /* discover transaction capabilites from the platform data */
1168 dma_dev->cap_mask = plat_data->cap_mask;
1169
1170 adev->pdev = pdev;
1171 platform_set_drvdata(pdev, adev);
1172
1173 INIT_LIST_HEAD(&dma_dev->channels);
1174
1175 /* set base routines */
1176 dma_dev->device_alloc_chan_resources = iop_adma_alloc_chan_resources;
1177 dma_dev->device_free_chan_resources = iop_adma_free_chan_resources;
1178 dma_dev->device_is_tx_complete = iop_adma_is_complete;
1179 dma_dev->device_issue_pending = iop_adma_issue_pending;
1180 dma_dev->device_dependency_added = iop_adma_dependency_added;
1181 dma_dev->dev = &pdev->dev;
1182
1183 /* set prep routines based on capability */
1184 if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask))
1185 dma_dev->device_prep_dma_memcpy = iop_adma_prep_dma_memcpy;
1186 if (dma_has_cap(DMA_MEMSET, dma_dev->cap_mask))
1187 dma_dev->device_prep_dma_memset = iop_adma_prep_dma_memset;
1188 if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) {
1189 dma_dev->max_xor = iop_adma_get_max_xor();
1190 dma_dev->device_prep_dma_xor = iop_adma_prep_dma_xor;
1191 }
1192 if (dma_has_cap(DMA_ZERO_SUM, dma_dev->cap_mask))
1193 dma_dev->device_prep_dma_zero_sum =
1194 iop_adma_prep_dma_zero_sum;
1195 if (dma_has_cap(DMA_INTERRUPT, dma_dev->cap_mask))
1196 dma_dev->device_prep_dma_interrupt =
1197 iop_adma_prep_dma_interrupt;
1198
1199 iop_chan = kzalloc(sizeof(*iop_chan), GFP_KERNEL);
1200 if (!iop_chan) {
1201 ret = -ENOMEM;
1202 goto err_free_dma;
1203 }
1204 iop_chan->device = adev;
1205
1206 iop_chan->mmr_base = devm_ioremap(&pdev->dev, res->start,
1207 res->end - res->start);
1208 if (!iop_chan->mmr_base) {
1209 ret = -ENOMEM;
1210 goto err_free_iop_chan;
1211 }
1212 tasklet_init(&iop_chan->irq_tasklet, iop_adma_tasklet, (unsigned long)
1213 iop_chan);
1214
1215 /* clear errors before enabling interrupts */
1216 iop_adma_device_clear_err_status(iop_chan);
1217
1218 for (i = 0; i < 3; i++) {
1219 irq_handler_t handler[] = { iop_adma_eot_handler,
1220 iop_adma_eoc_handler,
1221 iop_adma_err_handler };
1222 int irq = platform_get_irq(pdev, i);
1223 if (irq < 0) {
1224 ret = -ENXIO;
1225 goto err_free_iop_chan;
1226 } else {
1227 ret = devm_request_irq(&pdev->dev, irq,
1228 handler[i], 0, pdev->name, iop_chan);
1229 if (ret)
1230 goto err_free_iop_chan;
1231 }
1232 }
1233
1234 spin_lock_init(&iop_chan->lock);
1235 init_timer(&iop_chan->cleanup_watchdog);
1236 iop_chan->cleanup_watchdog.data = (unsigned long) iop_chan;
1237 iop_chan->cleanup_watchdog.function = iop_adma_tasklet;
1238 INIT_LIST_HEAD(&iop_chan->chain);
1239 INIT_LIST_HEAD(&iop_chan->all_slots);
1240 INIT_RCU_HEAD(&iop_chan->common.rcu);
1241 iop_chan->common.device = dma_dev;
1242 list_add_tail(&iop_chan->common.device_node, &dma_dev->channels);
1243
1244 if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask)) {
1245 ret = iop_adma_memcpy_self_test(adev);
1246 dev_dbg(&pdev->dev, "memcpy self test returned %d\n", ret);
1247 if (ret)
1248 goto err_free_iop_chan;
1249 }
1250
1251 if (dma_has_cap(DMA_XOR, dma_dev->cap_mask) ||
1252 dma_has_cap(DMA_MEMSET, dma_dev->cap_mask)) {
1253 ret = iop_adma_xor_zero_sum_self_test(adev);
1254 dev_dbg(&pdev->dev, "xor self test returned %d\n", ret);
1255 if (ret)
1256 goto err_free_iop_chan;
1257 }
1258
1259 dev_printk(KERN_INFO, &pdev->dev, "Intel(R) IOP: "
1260 "( %s%s%s%s%s%s%s%s%s%s)\n",
1261 dma_has_cap(DMA_PQ_XOR, dma_dev->cap_mask) ? "pq_xor " : "",
1262 dma_has_cap(DMA_PQ_UPDATE, dma_dev->cap_mask) ? "pq_update " : "",
1263 dma_has_cap(DMA_PQ_ZERO_SUM, dma_dev->cap_mask) ? "pq_zero_sum " : "",
1264 dma_has_cap(DMA_XOR, dma_dev->cap_mask) ? "xor " : "",
1265 dma_has_cap(DMA_DUAL_XOR, dma_dev->cap_mask) ? "dual_xor " : "",
1266 dma_has_cap(DMA_ZERO_SUM, dma_dev->cap_mask) ? "xor_zero_sum " : "",
1267 dma_has_cap(DMA_MEMSET, dma_dev->cap_mask) ? "fill " : "",
1268 dma_has_cap(DMA_MEMCPY_CRC32C, dma_dev->cap_mask) ? "cpy+crc " : "",
1269 dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask) ? "cpy " : "",
1270 dma_has_cap(DMA_INTERRUPT, dma_dev->cap_mask) ? "intr " : "");
1271
1272 dma_async_device_register(dma_dev);
1273 goto out;
1274
1275 err_free_iop_chan:
1276 kfree(iop_chan);
1277 err_free_dma:
1278 dma_free_coherent(&adev->pdev->dev, plat_data->pool_size,
1279 adev->dma_desc_pool_virt, adev->dma_desc_pool);
1280 err_free_adev:
1281 kfree(adev);
1282 out:
1283 return ret;
1284 }
1285
1286 static void iop_chan_start_null_memcpy(struct iop_adma_chan *iop_chan)
1287 {
1288 struct iop_adma_desc_slot *sw_desc, *grp_start;
1289 dma_cookie_t cookie;
1290 int slot_cnt, slots_per_op;
1291
1292 dev_dbg(iop_chan->device->common.dev, "%s\n", __FUNCTION__);
1293
1294 spin_lock_bh(&iop_chan->lock);
1295 slot_cnt = iop_chan_memcpy_slot_count(0, &slots_per_op);
1296 sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
1297 if (sw_desc) {
1298 grp_start = sw_desc->group_head;
1299
1300 list_splice_init(&sw_desc->async_tx.tx_list, &iop_chan->chain);
1301 sw_desc->async_tx.ack = 1;
1302 iop_desc_init_memcpy(grp_start, 0);
1303 iop_desc_set_byte_count(grp_start, iop_chan, 0);
1304 iop_desc_set_dest_addr(grp_start, iop_chan, 0);
1305 iop_desc_set_memcpy_src_addr(grp_start, 0);
1306
1307 cookie = iop_chan->common.cookie;
1308 cookie++;
1309 if (cookie <= 1)
1310 cookie = 2;
1311
1312 /* initialize the completed cookie to be less than
1313 * the most recently used cookie
1314 */
1315 iop_chan->completed_cookie = cookie - 1;
1316 iop_chan->common.cookie = sw_desc->async_tx.cookie = cookie;
1317
1318 /* channel should not be busy */
1319 BUG_ON(iop_chan_is_busy(iop_chan));
1320
1321 /* clear any prior error-status bits */
1322 iop_adma_device_clear_err_status(iop_chan);
1323
1324 /* disable operation */
1325 iop_chan_disable(iop_chan);
1326
1327 /* set the descriptor address */
1328 iop_chan_set_next_descriptor(iop_chan, sw_desc->async_tx.phys);
1329
1330 /* 1/ don't add pre-chained descriptors
1331 * 2/ dummy read to flush next_desc write
1332 */
1333 BUG_ON(iop_desc_get_next_desc(sw_desc));
1334
1335 /* run the descriptor */
1336 iop_chan_enable(iop_chan);
1337 } else
1338 dev_printk(KERN_ERR, iop_chan->device->common.dev,
1339 "failed to allocate null descriptor\n");
1340 spin_unlock_bh(&iop_chan->lock);
1341 }
1342
1343 static void iop_chan_start_null_xor(struct iop_adma_chan *iop_chan)
1344 {
1345 struct iop_adma_desc_slot *sw_desc, *grp_start;
1346 dma_cookie_t cookie;
1347 int slot_cnt, slots_per_op;
1348
1349 dev_dbg(iop_chan->device->common.dev, "%s\n", __FUNCTION__);
1350
1351 spin_lock_bh(&iop_chan->lock);
1352 slot_cnt = iop_chan_xor_slot_count(0, 2, &slots_per_op);
1353 sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
1354 if (sw_desc) {
1355 grp_start = sw_desc->group_head;
1356 list_splice_init(&sw_desc->async_tx.tx_list, &iop_chan->chain);
1357 sw_desc->async_tx.ack = 1;
1358 iop_desc_init_null_xor(grp_start, 2, 0);
1359 iop_desc_set_byte_count(grp_start, iop_chan, 0);
1360 iop_desc_set_dest_addr(grp_start, iop_chan, 0);
1361 iop_desc_set_xor_src_addr(grp_start, 0, 0);
1362 iop_desc_set_xor_src_addr(grp_start, 1, 0);
1363
1364 cookie = iop_chan->common.cookie;
1365 cookie++;
1366 if (cookie <= 1)
1367 cookie = 2;
1368
1369 /* initialize the completed cookie to be less than
1370 * the most recently used cookie
1371 */
1372 iop_chan->completed_cookie = cookie - 1;
1373 iop_chan->common.cookie = sw_desc->async_tx.cookie = cookie;
1374
1375 /* channel should not be busy */
1376 BUG_ON(iop_chan_is_busy(iop_chan));
1377
1378 /* clear any prior error-status bits */
1379 iop_adma_device_clear_err_status(iop_chan);
1380
1381 /* disable operation */
1382 iop_chan_disable(iop_chan);
1383
1384 /* set the descriptor address */
1385 iop_chan_set_next_descriptor(iop_chan, sw_desc->async_tx.phys);
1386
1387 /* 1/ don't add pre-chained descriptors
1388 * 2/ dummy read to flush next_desc write
1389 */
1390 BUG_ON(iop_desc_get_next_desc(sw_desc));
1391
1392 /* run the descriptor */
1393 iop_chan_enable(iop_chan);
1394 } else
1395 dev_printk(KERN_ERR, iop_chan->device->common.dev,
1396 "failed to allocate null descriptor\n");
1397 spin_unlock_bh(&iop_chan->lock);
1398 }
1399
1400 static struct platform_driver iop_adma_driver = {
1401 .probe = iop_adma_probe,
1402 .remove = iop_adma_remove,
1403 .driver = {
1404 .owner = THIS_MODULE,
1405 .name = "iop-adma",
1406 },
1407 };
1408
1409 static int __init iop_adma_init (void)
1410 {
1411 return platform_driver_register(&iop_adma_driver);
1412 }
1413
1414 /* it's currently unsafe to unload this module */
1415 #if 0
1416 static void __exit iop_adma_exit (void)
1417 {
1418 platform_driver_unregister(&iop_adma_driver);
1419 return;
1420 }
1421 module_exit(iop_adma_exit);
1422 #endif
1423
1424 module_init(iop_adma_init);
1425
1426 MODULE_AUTHOR("Intel Corporation");
1427 MODULE_DESCRIPTION("IOP ADMA Engine Driver");
1428 MODULE_LICENSE("GPL");
WRT350N Kernel Patches