?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
arm: omap: switch over to gpio_set_debounce
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / dma / iop-adma.c
blob161c452923b87d7c4dc8a4d4fa93a2f8cb429991
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 #define to_iop_adma_chan(chan) container_of(chan, struct iop_adma_chan, common)
40 #define to_iop_adma_device(dev) \
41 container_of(dev, struct iop_adma_device, common)
42 #define tx_to_iop_adma_slot(tx) \
43 container_of(tx, struct iop_adma_desc_slot, async_tx)
44
45 /**
46 * iop_adma_free_slots - flags descriptor slots for reuse
47 * @slot: Slot to free
48 * Caller must hold &iop_chan->lock while calling this function
49 */
50 static void iop_adma_free_slots(struct iop_adma_desc_slot *slot)
51 {
52 int stride = slot->slots_per_op;
53
54 while (stride--) {
55 slot->slots_per_op = 0;
56 slot = list_entry(slot->slot_node.next,
57 struct iop_adma_desc_slot,
58 slot_node);
59 }
60 }
61
62 static void
63 iop_desc_unmap(struct iop_adma_chan *iop_chan, struct iop_adma_desc_slot *desc)
64 {
65 struct dma_async_tx_descriptor *tx = &desc->async_tx;
66 struct iop_adma_desc_slot *unmap = desc->group_head;
67 struct device *dev = &iop_chan->device->pdev->dev;
68 u32 len = unmap->unmap_len;
69 enum dma_ctrl_flags flags = tx->flags;
70 u32 src_cnt;
71 dma_addr_t addr;
72 dma_addr_t dest;
73
74 src_cnt = unmap->unmap_src_cnt;
75 dest = iop_desc_get_dest_addr(unmap, iop_chan);
76 if (!(flags & DMA_COMPL_SKIP_DEST_UNMAP)) {
77 enum dma_data_direction dir;
78
79 if (src_cnt > 1) /* is xor? */
80 dir = DMA_BIDIRECTIONAL;
81 else
82 dir = DMA_FROM_DEVICE;
83
84 dma_unmap_page(dev, dest, len, dir);
85 }
86
87 if (!(flags & DMA_COMPL_SKIP_SRC_UNMAP)) {
88 while (src_cnt--) {
89 addr = iop_desc_get_src_addr(unmap, iop_chan, src_cnt);
90 if (addr == dest)
91 continue;
92 dma_unmap_page(dev, addr, len, DMA_TO_DEVICE);
93 }
94 }
95 desc->group_head = NULL;
96 }
97
98 static void
99 iop_desc_unmap_pq(struct iop_adma_chan *iop_chan, struct iop_adma_desc_slot *desc)
100 {
101 struct dma_async_tx_descriptor *tx = &desc->async_tx;
102 struct iop_adma_desc_slot *unmap = desc->group_head;
103 struct device *dev = &iop_chan->device->pdev->dev;
104 u32 len = unmap->unmap_len;
105 enum dma_ctrl_flags flags = tx->flags;
106 u32 src_cnt = unmap->unmap_src_cnt;
107 dma_addr_t pdest = iop_desc_get_dest_addr(unmap, iop_chan);
108 dma_addr_t qdest = iop_desc_get_qdest_addr(unmap, iop_chan);
109 int i;
110
111 if (tx->flags & DMA_PREP_CONTINUE)
112 src_cnt -= 3;
113
114 if (!(flags & DMA_COMPL_SKIP_DEST_UNMAP) && !desc->pq_check_result) {
115 dma_unmap_page(dev, pdest, len, DMA_BIDIRECTIONAL);
116 dma_unmap_page(dev, qdest, len, DMA_BIDIRECTIONAL);
117 }
118
119 if (!(flags & DMA_COMPL_SKIP_SRC_UNMAP)) {
120 dma_addr_t addr;
121
122 for (i = 0; i < src_cnt; i++) {
123 addr = iop_desc_get_src_addr(unmap, iop_chan, i);
124 dma_unmap_page(dev, addr, len, DMA_TO_DEVICE);
125 }
126 if (desc->pq_check_result) {
127 dma_unmap_page(dev, pdest, len, DMA_TO_DEVICE);
128 dma_unmap_page(dev, qdest, len, DMA_TO_DEVICE);
129 }
130 }
131
132 desc->group_head = NULL;
133 }
134
135
136 static dma_cookie_t
137 iop_adma_run_tx_complete_actions(struct iop_adma_desc_slot *desc,
138 struct iop_adma_chan *iop_chan, dma_cookie_t cookie)
139 {
140 struct dma_async_tx_descriptor *tx = &desc->async_tx;
141
142 BUG_ON(tx->cookie < 0);
143 if (tx->cookie > 0) {
144 cookie = tx->cookie;
145 tx->cookie = 0;
146
147 /* call the callback (must not sleep or submit new
148 * operations to this channel)
149 */
150 if (tx->callback)
151 tx->callback(tx->callback_param);
152
153 /* unmap dma addresses
154 * (unmap_single vs unmap_page?)
155 */
156 if (desc->group_head && desc->unmap_len) {
157 if (iop_desc_is_pq(desc))
158 iop_desc_unmap_pq(iop_chan, desc);
159 else
160 iop_desc_unmap(iop_chan, desc);
161 }
162 }
163
164 /* run dependent operations */
165 dma_run_dependencies(tx);
166
167 return cookie;
168 }
169
170 static int
171 iop_adma_clean_slot(struct iop_adma_desc_slot *desc,
172 struct iop_adma_chan *iop_chan)
173 {
174 /* the client is allowed to attach dependent operations
175 * until 'ack' is set
176 */
177 if (!async_tx_test_ack(&desc->async_tx))
178 return 0;
179
180 /* leave the last descriptor in the chain
181 * so we can append to it
182 */
183 if (desc->chain_node.next == &iop_chan->chain)
184 return 1;
185
186 dev_dbg(iop_chan->device->common.dev,
187 "\tfree slot: %d slots_per_op: %d\n",
188 desc->idx, desc->slots_per_op);
189
190 list_del(&desc->chain_node);
191 iop_adma_free_slots(desc);
192
193 return 0;
194 }
195
196 static void __iop_adma_slot_cleanup(struct iop_adma_chan *iop_chan)
197 {
198 struct iop_adma_desc_slot *iter, *_iter, *grp_start = NULL;
199 dma_cookie_t cookie = 0;
200 u32 current_desc = iop_chan_get_current_descriptor(iop_chan);
201 int busy = iop_chan_is_busy(iop_chan);
202 int seen_current = 0, slot_cnt = 0, slots_per_op = 0;
203
204 dev_dbg(iop_chan->device->common.dev, "%s\n", __func__);
205 /* free completed slots from the chain starting with
206 * the oldest descriptor
207 */
208 list_for_each_entry_safe(iter, _iter, &iop_chan->chain,
209 chain_node) {
210 pr_debug("\tcookie: %d slot: %d busy: %d "
211 "this_desc: %#x next_desc: %#x ack: %d\n",
212 iter->async_tx.cookie, iter->idx, busy,
213 iter->async_tx.phys, iop_desc_get_next_desc(iter),
214 async_tx_test_ack(&iter->async_tx));
215 prefetch(_iter);
216 prefetch(&_iter->async_tx);
217
218 /* do not advance past the current descriptor loaded into the
219 * hardware channel, subsequent descriptors are either in
220 * process or have not been submitted
221 */
222 if (seen_current)
223 break;
224
225 /* stop the search if we reach the current descriptor and the
226 * channel is busy, or if it appears that the current descriptor
227 * needs to be re-read (i.e. has been appended to)
228 */
229 if (iter->async_tx.phys == current_desc) {
230 BUG_ON(seen_current++);
231 if (busy || iop_desc_get_next_desc(iter))
232 break;
233 }
234
235 /* detect the start of a group transaction */
236 if (!slot_cnt && !slots_per_op) {
237 slot_cnt = iter->slot_cnt;
238 slots_per_op = iter->slots_per_op;
239 if (slot_cnt <= slots_per_op) {
240 slot_cnt = 0;
241 slots_per_op = 0;
242 }
243 }
244
245 if (slot_cnt) {
246 pr_debug("\tgroup++\n");
247 if (!grp_start)
248 grp_start = iter;
249 slot_cnt -= slots_per_op;
250 }
251
252 /* all the members of a group are complete */
253 if (slots_per_op != 0 && slot_cnt == 0) {
254 struct iop_adma_desc_slot *grp_iter, *_grp_iter;
255 int end_of_chain = 0;
256 pr_debug("\tgroup end\n");
257
258 /* collect the total results */
259 if (grp_start->xor_check_result) {
260 u32 zero_sum_result = 0;
261 slot_cnt = grp_start->slot_cnt;
262 grp_iter = grp_start;
263
264 list_for_each_entry_from(grp_iter,
265 &iop_chan->chain, chain_node) {
266 zero_sum_result |=
267 iop_desc_get_zero_result(grp_iter);
268 pr_debug("\titer%d result: %d\n",
269 grp_iter->idx, zero_sum_result);
270 slot_cnt -= slots_per_op;
271 if (slot_cnt == 0)
272 break;
273 }
274 pr_debug("\tgrp_start->xor_check_result: %p\n",
275 grp_start->xor_check_result);
276 *grp_start->xor_check_result = zero_sum_result;
277 }
278
279 /* clean up the group */
280 slot_cnt = grp_start->slot_cnt;
281 grp_iter = grp_start;
282 list_for_each_entry_safe_from(grp_iter, _grp_iter,
283 &iop_chan->chain, chain_node) {
284 cookie = iop_adma_run_tx_complete_actions(
285 grp_iter, iop_chan, cookie);
286
287 slot_cnt -= slots_per_op;
288 end_of_chain = iop_adma_clean_slot(grp_iter,
289 iop_chan);
290
291 if (slot_cnt == 0 || end_of_chain)
292 break;
293 }
294
295 /* the group should be complete at this point */
296 BUG_ON(slot_cnt);
297
298 slots_per_op = 0;
299 grp_start = NULL;
300 if (end_of_chain)
301 break;
302 else
303 continue;
304 } else if (slots_per_op) /* wait for group completion */
305 continue;
306
307 /* write back zero sum results (single descriptor case) */
308 if (iter->xor_check_result && iter->async_tx.cookie)
309 *iter->xor_check_result =
310 iop_desc_get_zero_result(iter);
311
312 cookie = iop_adma_run_tx_complete_actions(
313 iter, iop_chan, cookie);
314
315 if (iop_adma_clean_slot(iter, iop_chan))
316 break;
317 }
318
319 if (cookie > 0) {
320 iop_chan->completed_cookie = cookie;
321 pr_debug("\tcompleted cookie %d\n", cookie);
322 }
323 }
324
325 static void
326 iop_adma_slot_cleanup(struct iop_adma_chan *iop_chan)
327 {
328 spin_lock_bh(&iop_chan->lock);
329 __iop_adma_slot_cleanup(iop_chan);
330 spin_unlock_bh(&iop_chan->lock);
331 }
332
333 static void iop_adma_tasklet(unsigned long data)
334 {
335 struct iop_adma_chan *iop_chan = (struct iop_adma_chan *) data;
336
337 /* lockdep will flag depedency submissions as potentially
338 * recursive locking, this is not the case as a dependency
339 * submission will never recurse a channels submit routine.
340 * There are checks in async_tx.c to prevent this.
341 */
342 spin_lock_nested(&iop_chan->lock, SINGLE_DEPTH_NESTING);
343 __iop_adma_slot_cleanup(iop_chan);
344 spin_unlock(&iop_chan->lock);
345 }
346
347 static struct iop_adma_desc_slot *
348 iop_adma_alloc_slots(struct iop_adma_chan *iop_chan, int num_slots,
349 int slots_per_op)
350 {
351 struct iop_adma_desc_slot *iter, *_iter, *alloc_start = NULL;
352 LIST_HEAD(chain);
353 int slots_found, retry = 0;
354
355 /* start search from the last allocated descrtiptor
356 * if a contiguous allocation can not be found start searching
357 * from the beginning of the list
358 */
359 retry:
360 slots_found = 0;
361 if (retry == 0)
362 iter = iop_chan->last_used;
363 else
364 iter = list_entry(&iop_chan->all_slots,
365 struct iop_adma_desc_slot,
366 slot_node);
367
368 list_for_each_entry_safe_continue(
369 iter, _iter, &iop_chan->all_slots, slot_node) {
370 prefetch(_iter);
371 prefetch(&_iter->async_tx);
372 if (iter->slots_per_op) {
373 /* give up after finding the first busy slot
374 * on the second pass through the list
375 */
376 if (retry)
377 break;
378
379 slots_found = 0;
380 continue;
381 }
382
383 /* start the allocation if the slot is correctly aligned */
384 if (!slots_found++) {
385 if (iop_desc_is_aligned(iter, slots_per_op))
386 alloc_start = iter;
387 else {
388 slots_found = 0;
389 continue;
390 }
391 }
392
393 if (slots_found == num_slots) {
394 struct iop_adma_desc_slot *alloc_tail = NULL;
395 struct iop_adma_desc_slot *last_used = NULL;
396 iter = alloc_start;
397 while (num_slots) {
398 int i;
399 dev_dbg(iop_chan->device->common.dev,
400 "allocated slot: %d "
401 "(desc %p phys: %#x) slots_per_op %d\n",
402 iter->idx, iter->hw_desc,
403 iter->async_tx.phys, slots_per_op);
404
405 /* pre-ack all but the last descriptor */
406 if (num_slots != slots_per_op)
407 async_tx_ack(&iter->async_tx);
408
409 list_add_tail(&iter->chain_node, &chain);
410 alloc_tail = iter;
411 iter->async_tx.cookie = 0;
412 iter->slot_cnt = num_slots;
413 iter->xor_check_result = NULL;
414 for (i = 0; i < slots_per_op; i++) {
415 iter->slots_per_op = slots_per_op - i;
416 last_used = iter;
417 iter = list_entry(iter->slot_node.next,
418 struct iop_adma_desc_slot,
419 slot_node);
420 }
421 num_slots -= slots_per_op;
422 }
423 alloc_tail->group_head = alloc_start;
424 alloc_tail->async_tx.cookie = -EBUSY;
425 list_splice(&chain, &alloc_tail->tx_list);
426 iop_chan->last_used = last_used;
427 iop_desc_clear_next_desc(alloc_start);
428 iop_desc_clear_next_desc(alloc_tail);
429 return alloc_tail;
430 }
431 }
432 if (!retry++)
433 goto retry;
434
435 /* perform direct reclaim if the allocation fails */
436 __iop_adma_slot_cleanup(iop_chan);
437
438 return NULL;
439 }
440
441 static dma_cookie_t
442 iop_desc_assign_cookie(struct iop_adma_chan *iop_chan,
443 struct iop_adma_desc_slot *desc)
444 {
445 dma_cookie_t cookie = iop_chan->common.cookie;
446 cookie++;
447 if (cookie < 0)
448 cookie = 1;
449 iop_chan->common.cookie = desc->async_tx.cookie = cookie;
450 return cookie;
451 }
452
453 static void iop_adma_check_threshold(struct iop_adma_chan *iop_chan)
454 {
455 dev_dbg(iop_chan->device->common.dev, "pending: %d\n",
456 iop_chan->pending);
457
458 if (iop_chan->pending >= IOP_ADMA_THRESHOLD) {
459 iop_chan->pending = 0;
460 iop_chan_append(iop_chan);
461 }
462 }
463
464 static dma_cookie_t
465 iop_adma_tx_submit(struct dma_async_tx_descriptor *tx)
466 {
467 struct iop_adma_desc_slot *sw_desc = tx_to_iop_adma_slot(tx);
468 struct iop_adma_chan *iop_chan = to_iop_adma_chan(tx->chan);
469 struct iop_adma_desc_slot *grp_start, *old_chain_tail;
470 int slot_cnt;
471 int slots_per_op;
472 dma_cookie_t cookie;
473 dma_addr_t next_dma;
474
475 grp_start = sw_desc->group_head;
476 slot_cnt = grp_start->slot_cnt;
477 slots_per_op = grp_start->slots_per_op;
478
479 spin_lock_bh(&iop_chan->lock);
480 cookie = iop_desc_assign_cookie(iop_chan, sw_desc);
481
482 old_chain_tail = list_entry(iop_chan->chain.prev,
483 struct iop_adma_desc_slot, chain_node);
484 list_splice_init(&sw_desc->tx_list,
485 &old_chain_tail->chain_node);
486
487 /* fix up the hardware chain */
488 next_dma = grp_start->async_tx.phys;
489 iop_desc_set_next_desc(old_chain_tail, next_dma);
490 BUG_ON(iop_desc_get_next_desc(old_chain_tail) != next_dma); /* flush */
491
492 /* check for pre-chained descriptors */
493 iop_paranoia(iop_desc_get_next_desc(sw_desc));
494
495 /* increment the pending count by the number of slots
496 * memcpy operations have a 1:1 (slot:operation) relation
497 * other operations are heavier and will pop the threshold
498 * more often.
499 */
500 iop_chan->pending += slot_cnt;
501 iop_adma_check_threshold(iop_chan);
502 spin_unlock_bh(&iop_chan->lock);
503
504 dev_dbg(iop_chan->device->common.dev, "%s cookie: %d slot: %d\n",
505 __func__, sw_desc->async_tx.cookie, sw_desc->idx);
506
507 return cookie;
508 }
509
510 static void iop_chan_start_null_memcpy(struct iop_adma_chan *iop_chan);
511 static void iop_chan_start_null_xor(struct iop_adma_chan *iop_chan);
512
513 /**
514 * iop_adma_alloc_chan_resources - returns the number of allocated descriptors
515 * @chan - allocate descriptor resources for this channel
516 * @client - current client requesting the channel be ready for requests
517 *
518 * Note: We keep the slots for 1 operation on iop_chan->chain at all times. To
519 * avoid deadlock, via async_xor, num_descs_in_pool must at a minimum be
520 * greater than 2x the number slots needed to satisfy a device->max_xor
521 * request.
522 * */
523 static int iop_adma_alloc_chan_resources(struct dma_chan *chan)
524 {
525 char *hw_desc;
526 int idx;
527 struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
528 struct iop_adma_desc_slot *slot = NULL;
529 int init = iop_chan->slots_allocated ? 0 : 1;
530 struct iop_adma_platform_data *plat_data =
531 iop_chan->device->pdev->dev.platform_data;
532 int num_descs_in_pool = plat_data->pool_size/IOP_ADMA_SLOT_SIZE;
533
534 /* Allocate descriptor slots */
535 do {
536 idx = iop_chan->slots_allocated;
537 if (idx == num_descs_in_pool)
538 break;
539
540 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
541 if (!slot) {
542 printk(KERN_INFO "IOP ADMA Channel only initialized"
543 " %d descriptor slots", idx);
544 break;
545 }
546 hw_desc = (char *) iop_chan->device->dma_desc_pool_virt;
547 slot->hw_desc = (void *) &hw_desc[idx * IOP_ADMA_SLOT_SIZE];
548
549 dma_async_tx_descriptor_init(&slot->async_tx, chan);
550 slot->async_tx.tx_submit = iop_adma_tx_submit;
551 INIT_LIST_HEAD(&slot->tx_list);
552 INIT_LIST_HEAD(&slot->chain_node);
553 INIT_LIST_HEAD(&slot->slot_node);
554 hw_desc = (char *) iop_chan->device->dma_desc_pool;
555 slot->async_tx.phys =
556 (dma_addr_t) &hw_desc[idx * IOP_ADMA_SLOT_SIZE];
557 slot->idx = idx;
558
559 spin_lock_bh(&iop_chan->lock);
560 iop_chan->slots_allocated++;
561 list_add_tail(&slot->slot_node, &iop_chan->all_slots);
562 spin_unlock_bh(&iop_chan->lock);
563 } while (iop_chan->slots_allocated < num_descs_in_pool);
564
565 if (idx && !iop_chan->last_used)
566 iop_chan->last_used = list_entry(iop_chan->all_slots.next,
567 struct iop_adma_desc_slot,
568 slot_node);
569
570 dev_dbg(iop_chan->device->common.dev,
571 "allocated %d descriptor slots last_used: %p\n",
572 iop_chan->slots_allocated, iop_chan->last_used);
573
574 /* initialize the channel and the chain with a null operation */
575 if (init) {
576 if (dma_has_cap(DMA_MEMCPY,
577 iop_chan->device->common.cap_mask))
578 iop_chan_start_null_memcpy(iop_chan);
579 else if (dma_has_cap(DMA_XOR,
580 iop_chan->device->common.cap_mask))
581 iop_chan_start_null_xor(iop_chan);
582 else
583 BUG();
584 }
585
586 return (idx > 0) ? idx : -ENOMEM;
587 }
588
589 static struct dma_async_tx_descriptor *
590 iop_adma_prep_dma_interrupt(struct dma_chan *chan, 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 dev_dbg(iop_chan->device->common.dev, "%s\n", __func__);
597
598 spin_lock_bh(&iop_chan->lock);
599 slot_cnt = iop_chan_interrupt_slot_count(&slots_per_op, iop_chan);
600 sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
601 if (sw_desc) {
602 grp_start = sw_desc->group_head;
603 iop_desc_init_interrupt(grp_start, iop_chan);
604 grp_start->unmap_len = 0;
605 sw_desc->async_tx.flags = flags;
606 }
607 spin_unlock_bh(&iop_chan->lock);
608
609 return sw_desc ? &sw_desc->async_tx : NULL;
610 }
611
612 static struct dma_async_tx_descriptor *
613 iop_adma_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dma_dest,
614 dma_addr_t dma_src, size_t len, unsigned long flags)
615 {
616 struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
617 struct iop_adma_desc_slot *sw_desc, *grp_start;
618 int slot_cnt, slots_per_op;
619
620 if (unlikely(!len))
621 return NULL;
622 BUG_ON(unlikely(len > IOP_ADMA_MAX_BYTE_COUNT));
623
624 dev_dbg(iop_chan->device->common.dev, "%s len: %u\n",
625 __func__, len);
626
627 spin_lock_bh(&iop_chan->lock);
628 slot_cnt = iop_chan_memcpy_slot_count(len, &slots_per_op);
629 sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
630 if (sw_desc) {
631 grp_start = sw_desc->group_head;
632 iop_desc_init_memcpy(grp_start, flags);
633 iop_desc_set_byte_count(grp_start, iop_chan, len);
634 iop_desc_set_dest_addr(grp_start, iop_chan, dma_dest);
635 iop_desc_set_memcpy_src_addr(grp_start, dma_src);
636 sw_desc->unmap_src_cnt = 1;
637 sw_desc->unmap_len = len;
638 sw_desc->async_tx.flags = flags;
639 }
640 spin_unlock_bh(&iop_chan->lock);
641
642 return sw_desc ? &sw_desc->async_tx : NULL;
643 }
644
645 static struct dma_async_tx_descriptor *
646 iop_adma_prep_dma_memset(struct dma_chan *chan, dma_addr_t dma_dest,
647 int value, size_t len, unsigned long flags)
648 {
649 struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
650 struct iop_adma_desc_slot *sw_desc, *grp_start;
651 int slot_cnt, slots_per_op;
652
653 if (unlikely(!len))
654 return NULL;
655 BUG_ON(unlikely(len > IOP_ADMA_MAX_BYTE_COUNT));
656
657 dev_dbg(iop_chan->device->common.dev, "%s len: %u\n",
658 __func__, len);
659
660 spin_lock_bh(&iop_chan->lock);
661 slot_cnt = iop_chan_memset_slot_count(len, &slots_per_op);
662 sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
663 if (sw_desc) {
664 grp_start = sw_desc->group_head;
665 iop_desc_init_memset(grp_start, flags);
666 iop_desc_set_byte_count(grp_start, iop_chan, len);
667 iop_desc_set_block_fill_val(grp_start, value);
668 iop_desc_set_dest_addr(grp_start, iop_chan, dma_dest);
669 sw_desc->unmap_src_cnt = 1;
670 sw_desc->unmap_len = len;
671 sw_desc->async_tx.flags = flags;
672 }
673 spin_unlock_bh(&iop_chan->lock);
674
675 return sw_desc ? &sw_desc->async_tx : NULL;
676 }
677
678 static struct dma_async_tx_descriptor *
679 iop_adma_prep_dma_xor(struct dma_chan *chan, dma_addr_t dma_dest,
680 dma_addr_t *dma_src, unsigned int src_cnt, size_t len,
681 unsigned long flags)
682 {
683 struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
684 struct iop_adma_desc_slot *sw_desc, *grp_start;
685 int slot_cnt, slots_per_op;
686
687 if (unlikely(!len))
688 return NULL;
689 BUG_ON(unlikely(len > IOP_ADMA_XOR_MAX_BYTE_COUNT));
690
691 dev_dbg(iop_chan->device->common.dev,
692 "%s src_cnt: %d len: %u flags: %lx\n",
693 __func__, src_cnt, len, flags);
694
695 spin_lock_bh(&iop_chan->lock);
696 slot_cnt = iop_chan_xor_slot_count(len, src_cnt, &slots_per_op);
697 sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
698 if (sw_desc) {
699 grp_start = sw_desc->group_head;
700 iop_desc_init_xor(grp_start, src_cnt, flags);
701 iop_desc_set_byte_count(grp_start, iop_chan, len);
702 iop_desc_set_dest_addr(grp_start, iop_chan, dma_dest);
703 sw_desc->unmap_src_cnt = src_cnt;
704 sw_desc->unmap_len = len;
705 sw_desc->async_tx.flags = flags;
706 while (src_cnt--)
707 iop_desc_set_xor_src_addr(grp_start, src_cnt,
708 dma_src[src_cnt]);
709 }
710 spin_unlock_bh(&iop_chan->lock);
711
712 return sw_desc ? &sw_desc->async_tx : NULL;
713 }
714
715 static struct dma_async_tx_descriptor *
716 iop_adma_prep_dma_xor_val(struct dma_chan *chan, dma_addr_t *dma_src,
717 unsigned int src_cnt, size_t len, u32 *result,
718 unsigned long flags)
719 {
720 struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
721 struct iop_adma_desc_slot *sw_desc, *grp_start;
722 int slot_cnt, slots_per_op;
723
724 if (unlikely(!len))
725 return NULL;
726
727 dev_dbg(iop_chan->device->common.dev, "%s src_cnt: %d len: %u\n",
728 __func__, src_cnt, len);
729
730 spin_lock_bh(&iop_chan->lock);
731 slot_cnt = iop_chan_zero_sum_slot_count(len, src_cnt, &slots_per_op);
732 sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
733 if (sw_desc) {
734 grp_start = sw_desc->group_head;
735 iop_desc_init_zero_sum(grp_start, src_cnt, flags);
736 iop_desc_set_zero_sum_byte_count(grp_start, len);
737 grp_start->xor_check_result = result;
738 pr_debug("\t%s: grp_start->xor_check_result: %p\n",
739 __func__, grp_start->xor_check_result);
740 sw_desc->unmap_src_cnt = src_cnt;
741 sw_desc->unmap_len = len;
742 sw_desc->async_tx.flags = flags;
743 while (src_cnt--)
744 iop_desc_set_zero_sum_src_addr(grp_start, src_cnt,
745 dma_src[src_cnt]);
746 }
747 spin_unlock_bh(&iop_chan->lock);
748
749 return sw_desc ? &sw_desc->async_tx : NULL;
750 }
751
752 static struct dma_async_tx_descriptor *
753 iop_adma_prep_dma_pq(struct dma_chan *chan, dma_addr_t *dst, dma_addr_t *src,
754 unsigned int src_cnt, const unsigned char *scf, size_t len,
755 unsigned long flags)
756 {
757 struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
758 struct iop_adma_desc_slot *sw_desc, *g;
759 int slot_cnt, slots_per_op;
760 int continue_srcs;
761
762 if (unlikely(!len))
763 return NULL;
764 BUG_ON(len > IOP_ADMA_XOR_MAX_BYTE_COUNT);
765
766 dev_dbg(iop_chan->device->common.dev,
767 "%s src_cnt: %d len: %u flags: %lx\n",
768 __func__, src_cnt, len, flags);
769
770 if (dmaf_p_disabled_continue(flags))
771 continue_srcs = 1+src_cnt;
772 else if (dmaf_continue(flags))
773 continue_srcs = 3+src_cnt;
774 else
775 continue_srcs = 0+src_cnt;
776
777 spin_lock_bh(&iop_chan->lock);
778 slot_cnt = iop_chan_pq_slot_count(len, continue_srcs, &slots_per_op);
779 sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
780 if (sw_desc) {
781 int i;
782
783 g = sw_desc->group_head;
784 iop_desc_set_byte_count(g, iop_chan, len);
785
786 /* even if P is disabled its destination address (bits
787 * [3:0]) must match Q. It is ok if P points to an
788 * invalid address, it won't be written.
789 */
790 if (flags & DMA_PREP_PQ_DISABLE_P)
791 dst[0] = dst[1] & 0x7;
792
793 iop_desc_set_pq_addr(g, dst);
794 sw_desc->unmap_src_cnt = src_cnt;
795 sw_desc->unmap_len = len;
796 sw_desc->async_tx.flags = flags;
797 for (i = 0; i < src_cnt; i++)
798 iop_desc_set_pq_src_addr(g, i, src[i], scf[i]);
799
800 /* if we are continuing a previous operation factor in
801 * the old p and q values, see the comment for dma_maxpq
802 * in include/linux/dmaengine.h
803 */
804 if (dmaf_p_disabled_continue(flags))
805 iop_desc_set_pq_src_addr(g, i++, dst[1], 1);
806 else if (dmaf_continue(flags)) {
807 iop_desc_set_pq_src_addr(g, i++, dst[0], 0);
808 iop_desc_set_pq_src_addr(g, i++, dst[1], 1);
809 iop_desc_set_pq_src_addr(g, i++, dst[1], 0);
810 }
811 iop_desc_init_pq(g, i, flags);
812 }
813 spin_unlock_bh(&iop_chan->lock);
814
815 return sw_desc ? &sw_desc->async_tx : NULL;
816 }
817
818 static struct dma_async_tx_descriptor *
819 iop_adma_prep_dma_pq_val(struct dma_chan *chan, dma_addr_t *pq, dma_addr_t *src,
820 unsigned int src_cnt, const unsigned char *scf,
821 size_t len, enum sum_check_flags *pqres,
822 unsigned long flags)
823 {
824 struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
825 struct iop_adma_desc_slot *sw_desc, *g;
826 int slot_cnt, slots_per_op;
827
828 if (unlikely(!len))
829 return NULL;
830 BUG_ON(len > IOP_ADMA_XOR_MAX_BYTE_COUNT);
831
832 dev_dbg(iop_chan->device->common.dev, "%s src_cnt: %d len: %u\n",
833 __func__, src_cnt, len);
834
835 spin_lock_bh(&iop_chan->lock);
836 slot_cnt = iop_chan_pq_zero_sum_slot_count(len, src_cnt + 2, &slots_per_op);
837 sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
838 if (sw_desc) {
839 /* for validate operations p and q are tagged onto the
840 * end of the source list
841 */
842 int pq_idx = src_cnt;
843
844 g = sw_desc->group_head;
845 iop_desc_init_pq_zero_sum(g, src_cnt+2, flags);
846 iop_desc_set_pq_zero_sum_byte_count(g, len);
847 g->pq_check_result = pqres;
848 pr_debug("\t%s: g->pq_check_result: %p\n",
849 __func__, g->pq_check_result);
850 sw_desc->unmap_src_cnt = src_cnt+2;
851 sw_desc->unmap_len = len;
852 sw_desc->async_tx.flags = flags;
853 while (src_cnt--)
854 iop_desc_set_pq_zero_sum_src_addr(g, src_cnt,
855 src[src_cnt],
856 scf[src_cnt]);
857 iop_desc_set_pq_zero_sum_addr(g, pq_idx, src);
858 }
859 spin_unlock_bh(&iop_chan->lock);
860
861 return sw_desc ? &sw_desc->async_tx : NULL;
862 }
863
864 static void iop_adma_free_chan_resources(struct dma_chan *chan)
865 {
866 struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
867 struct iop_adma_desc_slot *iter, *_iter;
868 int in_use_descs = 0;
869
870 iop_adma_slot_cleanup(iop_chan);
871
872 spin_lock_bh(&iop_chan->lock);
873 list_for_each_entry_safe(iter, _iter, &iop_chan->chain,
874 chain_node) {
875 in_use_descs++;
876 list_del(&iter->chain_node);
877 }
878 list_for_each_entry_safe_reverse(
879 iter, _iter, &iop_chan->all_slots, slot_node) {
880 list_del(&iter->slot_node);
881 kfree(iter);
882 iop_chan->slots_allocated--;
883 }
884 iop_chan->last_used = NULL;
885
886 dev_dbg(iop_chan->device->common.dev, "%s slots_allocated %d\n",
887 __func__, iop_chan->slots_allocated);
888 spin_unlock_bh(&iop_chan->lock);
889
890 /* one is ok since we left it on there on purpose */
891 if (in_use_descs > 1)
892 printk(KERN_ERR "IOP: Freeing %d in use descriptors!\n",
893 in_use_descs - 1);
894 }
895
896 /**
897 * iop_adma_status - poll the status of an ADMA transaction
898 * @chan: ADMA channel handle
899 * @cookie: ADMA transaction identifier
900 * @txstate: a holder for the current state of the channel or NULL
901 */
902 static enum dma_status iop_adma_status(struct dma_chan *chan,
903 dma_cookie_t cookie,
904 struct dma_tx_state *txstate)
905 {
906 struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
907 dma_cookie_t last_used;
908 dma_cookie_t last_complete;
909 enum dma_status ret;
910
911 last_used = chan->cookie;
912 last_complete = iop_chan->completed_cookie;
913 dma_set_tx_state(txstate, last_complete, last_used, 0);
914 ret = dma_async_is_complete(cookie, last_complete, last_used);
915 if (ret == DMA_SUCCESS)
916 return ret;
917
918 iop_adma_slot_cleanup(iop_chan);
919
920 last_used = chan->cookie;
921 last_complete = iop_chan->completed_cookie;
922 dma_set_tx_state(txstate, last_complete, last_used, 0);
923
924 return dma_async_is_complete(cookie, last_complete, last_used);
925 }
926
927 static irqreturn_t iop_adma_eot_handler(int irq, void *data)
928 {
929 struct iop_adma_chan *chan = data;
930
931 dev_dbg(chan->device->common.dev, "%s\n", __func__);
932
933 tasklet_schedule(&chan->irq_tasklet);
934
935 iop_adma_device_clear_eot_status(chan);
936
937 return IRQ_HANDLED;
938 }
939
940 static irqreturn_t iop_adma_eoc_handler(int irq, void *data)
941 {
942 struct iop_adma_chan *chan = data;
943
944 dev_dbg(chan->device->common.dev, "%s\n", __func__);
945
946 tasklet_schedule(&chan->irq_tasklet);
947
948 iop_adma_device_clear_eoc_status(chan);
949
950 return IRQ_HANDLED;
951 }
952
953 static irqreturn_t iop_adma_err_handler(int irq, void *data)
954 {
955 struct iop_adma_chan *chan = data;
956 unsigned long status = iop_chan_get_status(chan);
957
958 dev_printk(KERN_ERR, chan->device->common.dev,
959 "error ( %s%s%s%s%s%s%s)\n",
960 iop_is_err_int_parity(status, chan) ? "int_parity " : "",
961 iop_is_err_mcu_abort(status, chan) ? "mcu_abort " : "",
962 iop_is_err_int_tabort(status, chan) ? "int_tabort " : "",
963 iop_is_err_int_mabort(status, chan) ? "int_mabort " : "",
964 iop_is_err_pci_tabort(status, chan) ? "pci_tabort " : "",
965 iop_is_err_pci_mabort(status, chan) ? "pci_mabort " : "",
966 iop_is_err_split_tx(status, chan) ? "split_tx " : "");
967
968 iop_adma_device_clear_err_status(chan);
969
970 BUG();
971
972 return IRQ_HANDLED;
973 }
974
975 static void iop_adma_issue_pending(struct dma_chan *chan)
976 {
977 struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
978
979 if (iop_chan->pending) {
980 iop_chan->pending = 0;
981 iop_chan_append(iop_chan);
982 }
983 }
984
985 /*
986 * Perform a transaction to verify the HW works.
987 */
988 #define IOP_ADMA_TEST_SIZE 2000
989
990 static int __devinit iop_adma_memcpy_self_test(struct iop_adma_device *device)
991 {
992 int i;
993 void *src, *dest;
994 dma_addr_t src_dma, dest_dma;
995 struct dma_chan *dma_chan;
996 dma_cookie_t cookie;
997 struct dma_async_tx_descriptor *tx;
998 int err = 0;
999 struct iop_adma_chan *iop_chan;
1000
1001 dev_dbg(device->common.dev, "%s\n", __func__);
1002
1003 src = kmalloc(IOP_ADMA_TEST_SIZE, GFP_KERNEL);
1004 if (!src)
1005 return -ENOMEM;
1006 dest = kzalloc(IOP_ADMA_TEST_SIZE, GFP_KERNEL);
1007 if (!dest) {
1008 kfree(src);
1009 return -ENOMEM;
1010 }
1011
1012 /* Fill in src buffer */
1013 for (i = 0; i < IOP_ADMA_TEST_SIZE; i++)
1014 ((u8 *) src)[i] = (u8)i;
1015
1016 /* Start copy, using first DMA channel */
1017 dma_chan = container_of(device->common.channels.next,
1018 struct dma_chan,
1019 device_node);
1020 if (iop_adma_alloc_chan_resources(dma_chan) < 1) {
1021 err = -ENODEV;
1022 goto out;
1023 }
1024
1025 dest_dma = dma_map_single(dma_chan->device->dev, dest,
1026 IOP_ADMA_TEST_SIZE, DMA_FROM_DEVICE);
1027 src_dma = dma_map_single(dma_chan->device->dev, src,
1028 IOP_ADMA_TEST_SIZE, DMA_TO_DEVICE);
1029 tx = iop_adma_prep_dma_memcpy(dma_chan, dest_dma, src_dma,
1030 IOP_ADMA_TEST_SIZE,
1031 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1032
1033 cookie = iop_adma_tx_submit(tx);
1034 iop_adma_issue_pending(dma_chan);
1035 msleep(1);
1036
1037 if (iop_adma_status(dma_chan, cookie, NULL) !=
1038 DMA_SUCCESS) {
1039 dev_printk(KERN_ERR, dma_chan->device->dev,
1040 "Self-test copy timed out, disabling\n");
1041 err = -ENODEV;
1042 goto free_resources;
1043 }
1044
1045 iop_chan = to_iop_adma_chan(dma_chan);
1046 dma_sync_single_for_cpu(&iop_chan->device->pdev->dev, dest_dma,
1047 IOP_ADMA_TEST_SIZE, DMA_FROM_DEVICE);
1048 if (memcmp(src, dest, IOP_ADMA_TEST_SIZE)) {
1049 dev_printk(KERN_ERR, dma_chan->device->dev,
1050 "Self-test copy failed compare, disabling\n");
1051 err = -ENODEV;
1052 goto free_resources;
1053 }
1054
1055 free_resources:
1056 iop_adma_free_chan_resources(dma_chan);
1057 out:
1058 kfree(src);
1059 kfree(dest);
1060 return err;
1061 }
1062
1063 #define IOP_ADMA_NUM_SRC_TEST 4 /* must be <= 15 */
1064 static int __devinit
1065 iop_adma_xor_val_self_test(struct iop_adma_device *device)
1066 {
1067 int i, src_idx;
1068 struct page *dest;
1069 struct page *xor_srcs[IOP_ADMA_NUM_SRC_TEST];
1070 struct page *zero_sum_srcs[IOP_ADMA_NUM_SRC_TEST + 1];
1071 dma_addr_t dma_srcs[IOP_ADMA_NUM_SRC_TEST + 1];
1072 dma_addr_t dma_addr, dest_dma;
1073 struct dma_async_tx_descriptor *tx;
1074 struct dma_chan *dma_chan;
1075 dma_cookie_t cookie;
1076 u8 cmp_byte = 0;
1077 u32 cmp_word;
1078 u32 zero_sum_result;
1079 int err = 0;
1080 struct iop_adma_chan *iop_chan;
1081
1082 dev_dbg(device->common.dev, "%s\n", __func__);
1083
1084 for (src_idx = 0; src_idx < IOP_ADMA_NUM_SRC_TEST; src_idx++) {
1085 xor_srcs[src_idx] = alloc_page(GFP_KERNEL);
1086 if (!xor_srcs[src_idx]) {
1087 while (src_idx--)
1088 __free_page(xor_srcs[src_idx]);
1089 return -ENOMEM;
1090 }
1091 }
1092
1093 dest = alloc_page(GFP_KERNEL);
1094 if (!dest) {
1095 while (src_idx--)
1096 __free_page(xor_srcs[src_idx]);
1097 return -ENOMEM;
1098 }
1099
1100 /* Fill in src buffers */
1101 for (src_idx = 0; src_idx < IOP_ADMA_NUM_SRC_TEST; src_idx++) {
1102 u8 *ptr = page_address(xor_srcs[src_idx]);
1103 for (i = 0; i < PAGE_SIZE; i++)
1104 ptr[i] = (1 << src_idx);
1105 }
1106
1107 for (src_idx = 0; src_idx < IOP_ADMA_NUM_SRC_TEST; src_idx++)
1108 cmp_byte ^= (u8) (1 << src_idx);
1109
1110 cmp_word = (cmp_byte << 24) | (cmp_byte << 16) |
1111 (cmp_byte << 8) | cmp_byte;
1112
1113 memset(page_address(dest), 0, PAGE_SIZE);
1114
1115 dma_chan = container_of(device->common.channels.next,
1116 struct dma_chan,
1117 device_node);
1118 if (iop_adma_alloc_chan_resources(dma_chan) < 1) {
1119 err = -ENODEV;
1120 goto out;
1121 }
1122
1123 /* test xor */
1124 dest_dma = dma_map_page(dma_chan->device->dev, dest, 0,
1125 PAGE_SIZE, DMA_FROM_DEVICE);
1126 for (i = 0; i < IOP_ADMA_NUM_SRC_TEST; i++)
1127 dma_srcs[i] = dma_map_page(dma_chan->device->dev, xor_srcs[i],
1128 0, PAGE_SIZE, DMA_TO_DEVICE);
1129 tx = iop_adma_prep_dma_xor(dma_chan, dest_dma, dma_srcs,
1130 IOP_ADMA_NUM_SRC_TEST, PAGE_SIZE,
1131 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1132
1133 cookie = iop_adma_tx_submit(tx);
1134 iop_adma_issue_pending(dma_chan);
1135 msleep(8);
1136
1137 if (iop_adma_status(dma_chan, cookie, NULL) !=
1138 DMA_SUCCESS) {
1139 dev_printk(KERN_ERR, dma_chan->device->dev,
1140 "Self-test xor timed out, disabling\n");
1141 err = -ENODEV;
1142 goto free_resources;
1143 }
1144
1145 iop_chan = to_iop_adma_chan(dma_chan);
1146 dma_sync_single_for_cpu(&iop_chan->device->pdev->dev, dest_dma,
1147 PAGE_SIZE, DMA_FROM_DEVICE);
1148 for (i = 0; i < (PAGE_SIZE / sizeof(u32)); i++) {
1149 u32 *ptr = page_address(dest);
1150 if (ptr[i] != cmp_word) {
1151 dev_printk(KERN_ERR, dma_chan->device->dev,
1152 "Self-test xor failed compare, disabling\n");
1153 err = -ENODEV;
1154 goto free_resources;
1155 }
1156 }
1157 dma_sync_single_for_device(&iop_chan->device->pdev->dev, dest_dma,
1158 PAGE_SIZE, DMA_TO_DEVICE);
1159
1160 /* skip zero sum if the capability is not present */
1161 if (!dma_has_cap(DMA_XOR_VAL, dma_chan->device->cap_mask))
1162 goto free_resources;
1163
1164 /* zero sum the sources with the destintation page */
1165 for (i = 0; i < IOP_ADMA_NUM_SRC_TEST; i++)
1166 zero_sum_srcs[i] = xor_srcs[i];
1167 zero_sum_srcs[i] = dest;
1168
1169 zero_sum_result = 1;
1170
1171 for (i = 0; i < IOP_ADMA_NUM_SRC_TEST + 1; i++)
1172 dma_srcs[i] = dma_map_page(dma_chan->device->dev,
1173 zero_sum_srcs[i], 0, PAGE_SIZE,
1174 DMA_TO_DEVICE);
1175 tx = iop_adma_prep_dma_xor_val(dma_chan, dma_srcs,
1176 IOP_ADMA_NUM_SRC_TEST + 1, PAGE_SIZE,
1177 &zero_sum_result,
1178 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1179
1180 cookie = iop_adma_tx_submit(tx);
1181 iop_adma_issue_pending(dma_chan);
1182 msleep(8);
1183
1184 if (iop_adma_status(dma_chan, cookie, NULL) != DMA_SUCCESS) {
1185 dev_printk(KERN_ERR, dma_chan->device->dev,
1186 "Self-test zero sum timed out, disabling\n");
1187 err = -ENODEV;
1188 goto free_resources;
1189 }
1190
1191 if (zero_sum_result != 0) {
1192 dev_printk(KERN_ERR, dma_chan->device->dev,
1193 "Self-test zero sum failed compare, disabling\n");
1194 err = -ENODEV;
1195 goto free_resources;
1196 }
1197
1198 /* test memset */
1199 dma_addr = dma_map_page(dma_chan->device->dev, dest, 0,
1200 PAGE_SIZE, DMA_FROM_DEVICE);
1201 tx = iop_adma_prep_dma_memset(dma_chan, dma_addr, 0, PAGE_SIZE,
1202 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1203
1204 cookie = iop_adma_tx_submit(tx);
1205 iop_adma_issue_pending(dma_chan);
1206 msleep(8);
1207
1208 if (iop_adma_status(dma_chan, cookie, NULL) != DMA_SUCCESS) {
1209 dev_printk(KERN_ERR, dma_chan->device->dev,
1210 "Self-test memset timed out, disabling\n");
1211 err = -ENODEV;
1212 goto free_resources;
1213 }
1214
1215 for (i = 0; i < PAGE_SIZE/sizeof(u32); i++) {
1216 u32 *ptr = page_address(dest);
1217 if (ptr[i]) {
1218 dev_printk(KERN_ERR, dma_chan->device->dev,
1219 "Self-test memset failed compare, disabling\n");
1220 err = -ENODEV;
1221 goto free_resources;
1222 }
1223 }
1224
1225 /* test for non-zero parity sum */
1226 zero_sum_result = 0;
1227 for (i = 0; i < IOP_ADMA_NUM_SRC_TEST + 1; i++)
1228 dma_srcs[i] = dma_map_page(dma_chan->device->dev,
1229 zero_sum_srcs[i], 0, PAGE_SIZE,
1230 DMA_TO_DEVICE);
1231 tx = iop_adma_prep_dma_xor_val(dma_chan, dma_srcs,
1232 IOP_ADMA_NUM_SRC_TEST + 1, PAGE_SIZE,
1233 &zero_sum_result,
1234 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1235
1236 cookie = iop_adma_tx_submit(tx);
1237 iop_adma_issue_pending(dma_chan);
1238 msleep(8);
1239
1240 if (iop_adma_status(dma_chan, cookie, NULL) != DMA_SUCCESS) {
1241 dev_printk(KERN_ERR, dma_chan->device->dev,
1242 "Self-test non-zero sum timed out, disabling\n");
1243 err = -ENODEV;
1244 goto free_resources;
1245 }
1246
1247 if (zero_sum_result != 1) {
1248 dev_printk(KERN_ERR, dma_chan->device->dev,
1249 "Self-test non-zero sum failed compare, disabling\n");
1250 err = -ENODEV;
1251 goto free_resources;
1252 }
1253
1254 free_resources:
1255 iop_adma_free_chan_resources(dma_chan);
1256 out:
1257 src_idx = IOP_ADMA_NUM_SRC_TEST;
1258 while (src_idx--)
1259 __free_page(xor_srcs[src_idx]);
1260 __free_page(dest);
1261 return err;
1262 }
1263
1264 #ifdef CONFIG_MD_RAID6_PQ
1265 static int __devinit
1266 iop_adma_pq_zero_sum_self_test(struct iop_adma_device *device)
1267 {
1268 /* combined sources, software pq results, and extra hw pq results */
1269 struct page *pq[IOP_ADMA_NUM_SRC_TEST+2+2];
1270 /* ptr to the extra hw pq buffers defined above */
1271 struct page **pq_hw = &pq[IOP_ADMA_NUM_SRC_TEST+2];
1272 /* address conversion buffers (dma_map / page_address) */
1273 void *pq_sw[IOP_ADMA_NUM_SRC_TEST+2];
1274 dma_addr_t pq_src[IOP_ADMA_NUM_SRC_TEST];
1275 dma_addr_t pq_dest[2];
1276
1277 int i;
1278 struct dma_async_tx_descriptor *tx;
1279 struct dma_chan *dma_chan;
1280 dma_cookie_t cookie;
1281 u32 zero_sum_result;
1282 int err = 0;
1283 struct device *dev;
1284
1285 dev_dbg(device->common.dev, "%s\n", __func__);
1286
1287 for (i = 0; i < ARRAY_SIZE(pq); i++) {
1288 pq[i] = alloc_page(GFP_KERNEL);
1289 if (!pq[i]) {
1290 while (i--)
1291 __free_page(pq[i]);
1292 return -ENOMEM;
1293 }
1294 }
1295
1296 /* Fill in src buffers */
1297 for (i = 0; i < IOP_ADMA_NUM_SRC_TEST; i++) {
1298 pq_sw[i] = page_address(pq[i]);
1299 memset(pq_sw[i], 0x11111111 * (1<<i), PAGE_SIZE);
1300 }
1301 pq_sw[i] = page_address(pq[i]);
1302 pq_sw[i+1] = page_address(pq[i+1]);
1303
1304 dma_chan = container_of(device->common.channels.next,
1305 struct dma_chan,
1306 device_node);
1307 if (iop_adma_alloc_chan_resources(dma_chan) < 1) {
1308 err = -ENODEV;
1309 goto out;
1310 }
1311
1312 dev = dma_chan->device->dev;
1313
1314 /* initialize the dests */
1315 memset(page_address(pq_hw[0]), 0 , PAGE_SIZE);
1316 memset(page_address(pq_hw[1]), 0 , PAGE_SIZE);
1317
1318 /* test pq */
1319 pq_dest[0] = dma_map_page(dev, pq_hw[0], 0, PAGE_SIZE, DMA_FROM_DEVICE);
1320 pq_dest[1] = dma_map_page(dev, pq_hw[1], 0, PAGE_SIZE, DMA_FROM_DEVICE);
1321 for (i = 0; i < IOP_ADMA_NUM_SRC_TEST; i++)
1322 pq_src[i] = dma_map_page(dev, pq[i], 0, PAGE_SIZE,
1323 DMA_TO_DEVICE);
1324
1325 tx = iop_adma_prep_dma_pq(dma_chan, pq_dest, pq_src,
1326 IOP_ADMA_NUM_SRC_TEST, (u8 *)raid6_gfexp,
1327 PAGE_SIZE,
1328 DMA_PREP_INTERRUPT |
1329 DMA_CTRL_ACK);
1330
1331 cookie = iop_adma_tx_submit(tx);
1332 iop_adma_issue_pending(dma_chan);
1333 msleep(8);
1334
1335 if (iop_adma_status(dma_chan, cookie, NULL) !=
1336 DMA_SUCCESS) {
1337 dev_err(dev, "Self-test pq timed out, disabling\n");
1338 err = -ENODEV;
1339 goto free_resources;
1340 }
1341
1342 raid6_call.gen_syndrome(IOP_ADMA_NUM_SRC_TEST+2, PAGE_SIZE, pq_sw);
1343
1344 if (memcmp(pq_sw[IOP_ADMA_NUM_SRC_TEST],
1345 page_address(pq_hw[0]), PAGE_SIZE) != 0) {
1346 dev_err(dev, "Self-test p failed compare, disabling\n");
1347 err = -ENODEV;
1348 goto free_resources;
1349 }
1350 if (memcmp(pq_sw[IOP_ADMA_NUM_SRC_TEST+1],
1351 page_address(pq_hw[1]), PAGE_SIZE) != 0) {
1352 dev_err(dev, "Self-test q failed compare, disabling\n");
1353 err = -ENODEV;
1354 goto free_resources;
1355 }
1356
1357 /* test correct zero sum using the software generated pq values */
1358 for (i = 0; i < IOP_ADMA_NUM_SRC_TEST + 2; i++)
1359 pq_src[i] = dma_map_page(dev, pq[i], 0, PAGE_SIZE,
1360 DMA_TO_DEVICE);
1361
1362 zero_sum_result = ~0;
1363 tx = iop_adma_prep_dma_pq_val(dma_chan, &pq_src[IOP_ADMA_NUM_SRC_TEST],
1364 pq_src, IOP_ADMA_NUM_SRC_TEST,
1365 raid6_gfexp, PAGE_SIZE, &zero_sum_result,
1366 DMA_PREP_INTERRUPT|DMA_CTRL_ACK);
1367
1368 cookie = iop_adma_tx_submit(tx);
1369 iop_adma_issue_pending(dma_chan);
1370 msleep(8);
1371
1372 if (iop_adma_status(dma_chan, cookie, NULL) !=
1373 DMA_SUCCESS) {
1374 dev_err(dev, "Self-test pq-zero-sum timed out, disabling\n");
1375 err = -ENODEV;
1376 goto free_resources;
1377 }
1378
1379 if (zero_sum_result != 0) {
1380 dev_err(dev, "Self-test pq-zero-sum failed to validate: %x\n",
1381 zero_sum_result);
1382 err = -ENODEV;
1383 goto free_resources;
1384 }
1385
1386 /* test incorrect zero sum */
1387 i = IOP_ADMA_NUM_SRC_TEST;
1388 memset(pq_sw[i] + 100, 0, 100);
1389 memset(pq_sw[i+1] + 200, 0, 200);
1390 for (i = 0; i < IOP_ADMA_NUM_SRC_TEST + 2; i++)
1391 pq_src[i] = dma_map_page(dev, pq[i], 0, PAGE_SIZE,
1392 DMA_TO_DEVICE);
1393
1394 zero_sum_result = 0;
1395 tx = iop_adma_prep_dma_pq_val(dma_chan, &pq_src[IOP_ADMA_NUM_SRC_TEST],
1396 pq_src, IOP_ADMA_NUM_SRC_TEST,
1397 raid6_gfexp, PAGE_SIZE, &zero_sum_result,
1398 DMA_PREP_INTERRUPT|DMA_CTRL_ACK);
1399
1400 cookie = iop_adma_tx_submit(tx);
1401 iop_adma_issue_pending(dma_chan);
1402 msleep(8);
1403
1404 if (iop_adma_status(dma_chan, cookie, NULL) !=
1405 DMA_SUCCESS) {
1406 dev_err(dev, "Self-test !pq-zero-sum timed out, disabling\n");
1407 err = -ENODEV;
1408 goto free_resources;
1409 }
1410
1411 if (zero_sum_result != (SUM_CHECK_P_RESULT | SUM_CHECK_Q_RESULT)) {
1412 dev_err(dev, "Self-test !pq-zero-sum failed to validate: %x\n",
1413 zero_sum_result);
1414 err = -ENODEV;
1415 goto free_resources;
1416 }
1417
1418 free_resources:
1419 iop_adma_free_chan_resources(dma_chan);
1420 out:
1421 i = ARRAY_SIZE(pq);
1422 while (i--)
1423 __free_page(pq[i]);
1424 return err;
1425 }
1426 #endif
1427
1428 static int __devexit iop_adma_remove(struct platform_device *dev)
1429 {
1430 struct iop_adma_device *device = platform_get_drvdata(dev);
1431 struct dma_chan *chan, *_chan;
1432 struct iop_adma_chan *iop_chan;
1433 struct iop_adma_platform_data *plat_data = dev->dev.platform_data;
1434
1435 dma_async_device_unregister(&device->common);
1436
1437 dma_free_coherent(&dev->dev, plat_data->pool_size,
1438 device->dma_desc_pool_virt, device->dma_desc_pool);
1439
1440 list_for_each_entry_safe(chan, _chan, &device->common.channels,
1441 device_node) {
1442 iop_chan = to_iop_adma_chan(chan);
1443 list_del(&chan->device_node);
1444 kfree(iop_chan);
1445 }
1446 kfree(device);
1447
1448 return 0;
1449 }
1450
1451 static int __devinit iop_adma_probe(struct platform_device *pdev)
1452 {
1453 struct resource *res;
1454 int ret = 0, i;
1455 struct iop_adma_device *adev;
1456 struct iop_adma_chan *iop_chan;
1457 struct dma_device *dma_dev;
1458 struct iop_adma_platform_data *plat_data = pdev->dev.platform_data;
1459
1460 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1461 if (!res)
1462 return -ENODEV;
1463
1464 if (!devm_request_mem_region(&pdev->dev, res->start,
1465 resource_size(res), pdev->name))
1466 return -EBUSY;
1467
1468 adev = kzalloc(sizeof(*adev), GFP_KERNEL);
1469 if (!adev)
1470 return -ENOMEM;
1471 dma_dev = &adev->common;
1472
1473 /* allocate coherent memory for hardware descriptors
1474 * note: writecombine gives slightly better performance, but
1475 * requires that we explicitly flush the writes
1476 */
1477 if ((adev->dma_desc_pool_virt = dma_alloc_writecombine(&pdev->dev,
1478 plat_data->pool_size,
1479 &adev->dma_desc_pool,
1480 GFP_KERNEL)) == NULL) {
1481 ret = -ENOMEM;
1482 goto err_free_adev;
1483 }
1484
1485 dev_dbg(&pdev->dev, "%s: allocted descriptor pool virt %p phys %p\n",
1486 __func__, adev->dma_desc_pool_virt,
1487 (void *) adev->dma_desc_pool);
1488
1489 adev->id = plat_data->hw_id;
1490
1491 /* discover transaction capabilites from the platform data */
1492 dma_dev->cap_mask = plat_data->cap_mask;
1493
1494 adev->pdev = pdev;
1495 platform_set_drvdata(pdev, adev);
1496
1497 INIT_LIST_HEAD(&dma_dev->channels);
1498
1499 /* set base routines */
1500 dma_dev->device_alloc_chan_resources = iop_adma_alloc_chan_resources;
1501 dma_dev->device_free_chan_resources = iop_adma_free_chan_resources;
1502 dma_dev->device_tx_status = iop_adma_status;
1503 dma_dev->device_issue_pending = iop_adma_issue_pending;
1504 dma_dev->dev = &pdev->dev;
1505
1506 /* set prep routines based on capability */
1507 if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask))
1508 dma_dev->device_prep_dma_memcpy = iop_adma_prep_dma_memcpy;
1509 if (dma_has_cap(DMA_MEMSET, dma_dev->cap_mask))
1510 dma_dev->device_prep_dma_memset = iop_adma_prep_dma_memset;
1511 if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) {
1512 dma_dev->max_xor = iop_adma_get_max_xor();
1513 dma_dev->device_prep_dma_xor = iop_adma_prep_dma_xor;
1514 }
1515 if (dma_has_cap(DMA_XOR_VAL, dma_dev->cap_mask))
1516 dma_dev->device_prep_dma_xor_val =
1517 iop_adma_prep_dma_xor_val;
1518 if (dma_has_cap(DMA_PQ, dma_dev->cap_mask)) {
1519 dma_set_maxpq(dma_dev, iop_adma_get_max_pq(), 0);
1520 dma_dev->device_prep_dma_pq = iop_adma_prep_dma_pq;
1521 }
1522 if (dma_has_cap(DMA_PQ_VAL, dma_dev->cap_mask))
1523 dma_dev->device_prep_dma_pq_val =
1524 iop_adma_prep_dma_pq_val;
1525 if (dma_has_cap(DMA_INTERRUPT, dma_dev->cap_mask))
1526 dma_dev->device_prep_dma_interrupt =
1527 iop_adma_prep_dma_interrupt;
1528
1529 iop_chan = kzalloc(sizeof(*iop_chan), GFP_KERNEL);
1530 if (!iop_chan) {
1531 ret = -ENOMEM;
1532 goto err_free_dma;
1533 }
1534 iop_chan->device = adev;
1535
1536 iop_chan->mmr_base = devm_ioremap(&pdev->dev, res->start,
1537 resource_size(res));
1538 if (!iop_chan->mmr_base) {
1539 ret = -ENOMEM;
1540 goto err_free_iop_chan;
1541 }
1542 tasklet_init(&iop_chan->irq_tasklet, iop_adma_tasklet, (unsigned long)
1543 iop_chan);
1544
1545 /* clear errors before enabling interrupts */
1546 iop_adma_device_clear_err_status(iop_chan);
1547
1548 for (i = 0; i < 3; i++) {
1549 irq_handler_t handler[] = { iop_adma_eot_handler,
1550 iop_adma_eoc_handler,
1551 iop_adma_err_handler };
1552 int irq = platform_get_irq(pdev, i);
1553 if (irq < 0) {
1554 ret = -ENXIO;
1555 goto err_free_iop_chan;
1556 } else {
1557 ret = devm_request_irq(&pdev->dev, irq,
1558 handler[i], 0, pdev->name, iop_chan);
1559 if (ret)
1560 goto err_free_iop_chan;
1561 }
1562 }
1563
1564 spin_lock_init(&iop_chan->lock);
1565 INIT_LIST_HEAD(&iop_chan->chain);
1566 INIT_LIST_HEAD(&iop_chan->all_slots);
1567 iop_chan->common.device = dma_dev;
1568 list_add_tail(&iop_chan->common.device_node, &dma_dev->channels);
1569
1570 if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask)) {
1571 ret = iop_adma_memcpy_self_test(adev);
1572 dev_dbg(&pdev->dev, "memcpy self test returned %d\n", ret);
1573 if (ret)
1574 goto err_free_iop_chan;
1575 }
1576
1577 if (dma_has_cap(DMA_XOR, dma_dev->cap_mask) ||
1578 dma_has_cap(DMA_MEMSET, dma_dev->cap_mask)) {
1579 ret = iop_adma_xor_val_self_test(adev);
1580 dev_dbg(&pdev->dev, "xor self test returned %d\n", ret);
1581 if (ret)
1582 goto err_free_iop_chan;
1583 }
1584
1585 if (dma_has_cap(DMA_PQ, dma_dev->cap_mask) &&
1586 dma_has_cap(DMA_PQ_VAL, dma_dev->cap_mask)) {
1587 #ifdef CONFIG_MD_RAID6_PQ
1588 ret = iop_adma_pq_zero_sum_self_test(adev);
1589 dev_dbg(&pdev->dev, "pq self test returned %d\n", ret);
1590 #else
1591 /* can not test raid6, so do not publish capability */
1592 dma_cap_clear(DMA_PQ, dma_dev->cap_mask);
1593 dma_cap_clear(DMA_PQ_VAL, dma_dev->cap_mask);
1594 ret = 0;
1595 #endif
1596 if (ret)
1597 goto err_free_iop_chan;
1598 }
1599
1600 dev_printk(KERN_INFO, &pdev->dev, "Intel(R) IOP: "
1601 "( %s%s%s%s%s%s%s)\n",
1602 dma_has_cap(DMA_PQ, dma_dev->cap_mask) ? "pq " : "",
1603 dma_has_cap(DMA_PQ_VAL, dma_dev->cap_mask) ? "pq_val " : "",
1604 dma_has_cap(DMA_XOR, dma_dev->cap_mask) ? "xor " : "",
1605 dma_has_cap(DMA_XOR_VAL, dma_dev->cap_mask) ? "xor_val " : "",
1606 dma_has_cap(DMA_MEMSET, dma_dev->cap_mask) ? "fill " : "",
1607 dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask) ? "cpy " : "",
1608 dma_has_cap(DMA_INTERRUPT, dma_dev->cap_mask) ? "intr " : "");
1609
1610 dma_async_device_register(dma_dev);
1611 goto out;
1612
1613 err_free_iop_chan:
1614 kfree(iop_chan);
1615 err_free_dma:
1616 dma_free_coherent(&adev->pdev->dev, plat_data->pool_size,
1617 adev->dma_desc_pool_virt, adev->dma_desc_pool);
1618 err_free_adev:
1619 kfree(adev);
1620 out:
1621 return ret;
1622 }
1623
1624 static void iop_chan_start_null_memcpy(struct iop_adma_chan *iop_chan)
1625 {
1626 struct iop_adma_desc_slot *sw_desc, *grp_start;
1627 dma_cookie_t cookie;
1628 int slot_cnt, slots_per_op;
1629
1630 dev_dbg(iop_chan->device->common.dev, "%s\n", __func__);
1631
1632 spin_lock_bh(&iop_chan->lock);
1633 slot_cnt = iop_chan_memcpy_slot_count(0, &slots_per_op);
1634 sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
1635 if (sw_desc) {
1636 grp_start = sw_desc->group_head;
1637
1638 list_splice_init(&sw_desc->tx_list, &iop_chan->chain);
1639 async_tx_ack(&sw_desc->async_tx);
1640 iop_desc_init_memcpy(grp_start, 0);
1641 iop_desc_set_byte_count(grp_start, iop_chan, 0);
1642 iop_desc_set_dest_addr(grp_start, iop_chan, 0);
1643 iop_desc_set_memcpy_src_addr(grp_start, 0);
1644
1645 cookie = iop_chan->common.cookie;
1646 cookie++;
1647 if (cookie <= 1)
1648 cookie = 2;
1649
1650 /* initialize the completed cookie to be less than
1651 * the most recently used cookie
1652 */
1653 iop_chan->completed_cookie = cookie - 1;
1654 iop_chan->common.cookie = sw_desc->async_tx.cookie = cookie;
1655
1656 /* channel should not be busy */
1657 BUG_ON(iop_chan_is_busy(iop_chan));
1658
1659 /* clear any prior error-status bits */
1660 iop_adma_device_clear_err_status(iop_chan);
1661
1662 /* disable operation */
1663 iop_chan_disable(iop_chan);
1664
1665 /* set the descriptor address */
1666 iop_chan_set_next_descriptor(iop_chan, sw_desc->async_tx.phys);
1667
1668 /* 1/ don't add pre-chained descriptors
1669 * 2/ dummy read to flush next_desc write
1670 */
1671 BUG_ON(iop_desc_get_next_desc(sw_desc));
1672
1673 /* run the descriptor */
1674 iop_chan_enable(iop_chan);
1675 } else
1676 dev_printk(KERN_ERR, iop_chan->device->common.dev,
1677 "failed to allocate null descriptor\n");
1678 spin_unlock_bh(&iop_chan->lock);
1679 }
1680
1681 static void iop_chan_start_null_xor(struct iop_adma_chan *iop_chan)
1682 {
1683 struct iop_adma_desc_slot *sw_desc, *grp_start;
1684 dma_cookie_t cookie;
1685 int slot_cnt, slots_per_op;
1686
1687 dev_dbg(iop_chan->device->common.dev, "%s\n", __func__);
1688
1689 spin_lock_bh(&iop_chan->lock);
1690 slot_cnt = iop_chan_xor_slot_count(0, 2, &slots_per_op);
1691 sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
1692 if (sw_desc) {
1693 grp_start = sw_desc->group_head;
1694 list_splice_init(&sw_desc->tx_list, &iop_chan->chain);
1695 async_tx_ack(&sw_desc->async_tx);
1696 iop_desc_init_null_xor(grp_start, 2, 0);
1697 iop_desc_set_byte_count(grp_start, iop_chan, 0);
1698 iop_desc_set_dest_addr(grp_start, iop_chan, 0);
1699 iop_desc_set_xor_src_addr(grp_start, 0, 0);
1700 iop_desc_set_xor_src_addr(grp_start, 1, 0);
1701
1702 cookie = iop_chan->common.cookie;
1703 cookie++;
1704 if (cookie <= 1)
1705 cookie = 2;
1706
1707 /* initialize the completed cookie to be less than
1708 * the most recently used cookie
1709 */
1710 iop_chan->completed_cookie = cookie - 1;
1711 iop_chan->common.cookie = sw_desc->async_tx.cookie = cookie;
1712
1713 /* channel should not be busy */
1714 BUG_ON(iop_chan_is_busy(iop_chan));
1715
1716 /* clear any prior error-status bits */
1717 iop_adma_device_clear_err_status(iop_chan);
1718
1719 /* disable operation */
1720 iop_chan_disable(iop_chan);
1721
1722 /* set the descriptor address */
1723 iop_chan_set_next_descriptor(iop_chan, sw_desc->async_tx.phys);
1724
1725 /* 1/ don't add pre-chained descriptors
1726 * 2/ dummy read to flush next_desc write
1727 */
1728 BUG_ON(iop_desc_get_next_desc(sw_desc));
1729
1730 /* run the descriptor */
1731 iop_chan_enable(iop_chan);
1732 } else
1733 dev_printk(KERN_ERR, iop_chan->device->common.dev,
1734 "failed to allocate null descriptor\n");
1735 spin_unlock_bh(&iop_chan->lock);
1736 }
1737
1738 MODULE_ALIAS("platform:iop-adma");
1739
1740 static struct platform_driver iop_adma_driver = {
1741 .probe = iop_adma_probe,
1742 .remove = __devexit_p(iop_adma_remove),
1743 .driver = {
1744 .owner = THIS_MODULE,
1745 .name = "iop-adma",
1746 },
1747 };
1748
1749 static int __init iop_adma_init (void)
1750 {
1751 return platform_driver_register(&iop_adma_driver);
1752 }
1753
1754 static void __exit iop_adma_exit (void)
1755 {
1756 platform_driver_unregister(&iop_adma_driver);
1757 return;
1758 }
1759 module_exit(iop_adma_exit);
1760 module_init(iop_adma_init);
1761
1762 MODULE_AUTHOR("Intel Corporation");
1763 MODULE_DESCRIPTION("IOP ADMA Engine Driver");
1764 MODULE_LICENSE("GPL");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree