async_xor: dma_map destination DMA_BIDIRECTIONAL
[linux-2.6.git] / drivers / dma / iop-adma.c
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 <mach/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         if (desc->async_tx.cookie > 0) {
67                 cookie = desc->async_tx.cookie;
68                 desc->async_tx.cookie = 0;
69
70                 /* call the callback (must not sleep or submit new
71                  * operations to this channel)
72                  */
73                 if (desc->async_tx.callback)
74                         desc->async_tx.callback(
75                                 desc->async_tx.callback_param);
76
77                 /* unmap dma addresses
78                  * (unmap_single vs unmap_page?)
79                  */
80                 if (desc->group_head && desc->unmap_len) {
81                         struct iop_adma_desc_slot *unmap = desc->group_head;
82                         struct device *dev =
83                                 &iop_chan->device->pdev->dev;
84                         u32 len = unmap->unmap_len;
85                         enum dma_ctrl_flags flags = desc->async_tx.flags;
86                         u32 src_cnt;
87                         dma_addr_t addr;
88                         dma_addr_t dest;
89
90                         src_cnt = unmap->unmap_src_cnt;
91                         dest = iop_desc_get_dest_addr(unmap, iop_chan);
92                         if (!(flags & DMA_COMPL_SKIP_DEST_UNMAP)) {
93                                 enum dma_data_direction dir;
94
95                                 if (src_cnt > 1) /* is xor? */
96                                         dir = DMA_BIDIRECTIONAL;
97                                 else
98                                         dir = DMA_FROM_DEVICE;
99
100                                 dma_unmap_page(dev, dest, len, dir);
101                         }
102
103                         if (!(flags & DMA_COMPL_SKIP_SRC_UNMAP)) {
104                                 while (src_cnt--) {
105                                         addr = iop_desc_get_src_addr(unmap,
106                                                                      iop_chan,
107                                                                      src_cnt);
108                                         if (addr == dest)
109                                                 continue;
110                                         dma_unmap_page(dev, addr, len,
111                                                        DMA_TO_DEVICE);
112                                 }
113                         }
114                         desc->group_head = NULL;
115                 }
116         }
117
118         /* run dependent operations */
119         async_tx_run_dependencies(&desc->async_tx);
120
121         return cookie;
122 }
123
124 static int
125 iop_adma_clean_slot(struct iop_adma_desc_slot *desc,
126         struct iop_adma_chan *iop_chan)
127 {
128         /* the client is allowed to attach dependent operations
129          * until 'ack' is set
130          */
131         if (!async_tx_test_ack(&desc->async_tx))
132                 return 0;
133
134         /* leave the last descriptor in the chain
135          * so we can append to it
136          */
137         if (desc->chain_node.next == &iop_chan->chain)
138                 return 1;
139
140         dev_dbg(iop_chan->device->common.dev,
141                 "\tfree slot: %d slots_per_op: %d\n",
142                 desc->idx, desc->slots_per_op);
143
144         list_del(&desc->chain_node);
145         iop_adma_free_slots(desc);
146
147         return 0;
148 }
149
150 static void __iop_adma_slot_cleanup(struct iop_adma_chan *iop_chan)
151 {
152         struct iop_adma_desc_slot *iter, *_iter, *grp_start = NULL;
153         dma_cookie_t cookie = 0;
154         u32 current_desc = iop_chan_get_current_descriptor(iop_chan);
155         int busy = iop_chan_is_busy(iop_chan);
156         int seen_current = 0, slot_cnt = 0, slots_per_op = 0;
157
158         dev_dbg(iop_chan->device->common.dev, "%s\n", __func__);
159         /* free completed slots from the chain starting with
160          * the oldest descriptor
161          */
162         list_for_each_entry_safe(iter, _iter, &iop_chan->chain,
163                                         chain_node) {
164                 pr_debug("\tcookie: %d slot: %d busy: %d "
165                         "this_desc: %#x next_desc: %#x ack: %d\n",
166                         iter->async_tx.cookie, iter->idx, busy,
167                         iter->async_tx.phys, iop_desc_get_next_desc(iter),
168                         async_tx_test_ack(&iter->async_tx));
169                 prefetch(_iter);
170                 prefetch(&_iter->async_tx);
171
172                 /* do not advance past the current descriptor loaded into the
173                  * hardware channel, subsequent descriptors are either in
174                  * process or have not been submitted
175                  */
176                 if (seen_current)
177                         break;
178
179                 /* stop the search if we reach the current descriptor and the
180                  * channel is busy, or if it appears that the current descriptor
181                  * needs to be re-read (i.e. has been appended to)
182                  */
183                 if (iter->async_tx.phys == current_desc) {
184                         BUG_ON(seen_current++);
185                         if (busy || iop_desc_get_next_desc(iter))
186                                 break;
187                 }
188
189                 /* detect the start of a group transaction */
190                 if (!slot_cnt && !slots_per_op) {
191                         slot_cnt = iter->slot_cnt;
192                         slots_per_op = iter->slots_per_op;
193                         if (slot_cnt <= slots_per_op) {
194                                 slot_cnt = 0;
195                                 slots_per_op = 0;
196                         }
197                 }
198
199                 if (slot_cnt) {
200                         pr_debug("\tgroup++\n");
201                         if (!grp_start)
202                                 grp_start = iter;
203                         slot_cnt -= slots_per_op;
204                 }
205
206                 /* all the members of a group are complete */
207                 if (slots_per_op != 0 && slot_cnt == 0) {
208                         struct iop_adma_desc_slot *grp_iter, *_grp_iter;
209                         int end_of_chain = 0;
210                         pr_debug("\tgroup end\n");
211
212                         /* collect the total results */
213                         if (grp_start->xor_check_result) {
214                                 u32 zero_sum_result = 0;
215                                 slot_cnt = grp_start->slot_cnt;
216                                 grp_iter = grp_start;
217
218                                 list_for_each_entry_from(grp_iter,
219                                         &iop_chan->chain, chain_node) {
220                                         zero_sum_result |=
221                                             iop_desc_get_zero_result(grp_iter);
222                                             pr_debug("\titer%d result: %d\n",
223                                             grp_iter->idx, zero_sum_result);
224                                         slot_cnt -= slots_per_op;
225                                         if (slot_cnt == 0)
226                                                 break;
227                                 }
228                                 pr_debug("\tgrp_start->xor_check_result: %p\n",
229                                         grp_start->xor_check_result);
230                                 *grp_start->xor_check_result = zero_sum_result;
231                         }
232
233                         /* clean up the group */
234                         slot_cnt = grp_start->slot_cnt;
235                         grp_iter = grp_start;
236                         list_for_each_entry_safe_from(grp_iter, _grp_iter,
237                                 &iop_chan->chain, chain_node) {
238                                 cookie = iop_adma_run_tx_complete_actions(
239                                         grp_iter, iop_chan, cookie);
240
241                                 slot_cnt -= slots_per_op;
242                                 end_of_chain = iop_adma_clean_slot(grp_iter,
243                                         iop_chan);
244
245                                 if (slot_cnt == 0 || end_of_chain)
246                                         break;
247                         }
248
249                         /* the group should be complete at this point */
250                         BUG_ON(slot_cnt);
251
252                         slots_per_op = 0;
253                         grp_start = NULL;
254                         if (end_of_chain)
255                                 break;
256                         else
257                                 continue;
258                 } else if (slots_per_op) /* wait for group completion */
259                         continue;
260
261                 /* write back zero sum results (single descriptor case) */
262                 if (iter->xor_check_result && iter->async_tx.cookie)
263                         *iter->xor_check_result =
264                                 iop_desc_get_zero_result(iter);
265
266                 cookie = iop_adma_run_tx_complete_actions(
267                                         iter, iop_chan, cookie);
268
269                 if (iop_adma_clean_slot(iter, iop_chan))
270                         break;
271         }
272
273         BUG_ON(!seen_current);
274
275         if (cookie > 0) {
276                 iop_chan->completed_cookie = cookie;
277                 pr_debug("\tcompleted cookie %d\n", cookie);
278         }
279 }
280
281 static void
282 iop_adma_slot_cleanup(struct iop_adma_chan *iop_chan)
283 {
284         spin_lock_bh(&iop_chan->lock);
285         __iop_adma_slot_cleanup(iop_chan);
286         spin_unlock_bh(&iop_chan->lock);
287 }
288
289 static void iop_adma_tasklet(unsigned long data)
290 {
291         struct iop_adma_chan *iop_chan = (struct iop_adma_chan *) data;
292
293         spin_lock(&iop_chan->lock);
294         __iop_adma_slot_cleanup(iop_chan);
295         spin_unlock(&iop_chan->lock);
296 }
297
298 static struct iop_adma_desc_slot *
299 iop_adma_alloc_slots(struct iop_adma_chan *iop_chan, int num_slots,
300                         int slots_per_op)
301 {
302         struct iop_adma_desc_slot *iter, *_iter, *alloc_start = NULL;
303         LIST_HEAD(chain);
304         int slots_found, retry = 0;
305
306         /* start search from the last allocated descrtiptor
307          * if a contiguous allocation can not be found start searching
308          * from the beginning of the list
309          */
310 retry:
311         slots_found = 0;
312         if (retry == 0)
313                 iter = iop_chan->last_used;
314         else
315                 iter = list_entry(&iop_chan->all_slots,
316                         struct iop_adma_desc_slot,
317                         slot_node);
318
319         list_for_each_entry_safe_continue(
320                 iter, _iter, &iop_chan->all_slots, slot_node) {
321                 prefetch(_iter);
322                 prefetch(&_iter->async_tx);
323                 if (iter->slots_per_op) {
324                         /* give up after finding the first busy slot
325                          * on the second pass through the list
326                          */
327                         if (retry)
328                                 break;
329
330                         slots_found = 0;
331                         continue;
332                 }
333
334                 /* start the allocation if the slot is correctly aligned */
335                 if (!slots_found++) {
336                         if (iop_desc_is_aligned(iter, slots_per_op))
337                                 alloc_start = iter;
338                         else {
339                                 slots_found = 0;
340                                 continue;
341                         }
342                 }
343
344                 if (slots_found == num_slots) {
345                         struct iop_adma_desc_slot *alloc_tail = NULL;
346                         struct iop_adma_desc_slot *last_used = NULL;
347                         iter = alloc_start;
348                         while (num_slots) {
349                                 int i;
350                                 dev_dbg(iop_chan->device->common.dev,
351                                         "allocated slot: %d "
352                                         "(desc %p phys: %#x) slots_per_op %d\n",
353                                         iter->idx, iter->hw_desc,
354                                         iter->async_tx.phys, slots_per_op);
355
356                                 /* pre-ack all but the last descriptor */
357                                 if (num_slots != slots_per_op)
358                                         async_tx_ack(&iter->async_tx);
359
360                                 list_add_tail(&iter->chain_node, &chain);
361                                 alloc_tail = iter;
362                                 iter->async_tx.cookie = 0;
363                                 iter->slot_cnt = num_slots;
364                                 iter->xor_check_result = NULL;
365                                 for (i = 0; i < slots_per_op; i++) {
366                                         iter->slots_per_op = slots_per_op - i;
367                                         last_used = iter;
368                                         iter = list_entry(iter->slot_node.next,
369                                                 struct iop_adma_desc_slot,
370                                                 slot_node);
371                                 }
372                                 num_slots -= slots_per_op;
373                         }
374                         alloc_tail->group_head = alloc_start;
375                         alloc_tail->async_tx.cookie = -EBUSY;
376                         list_splice(&chain, &alloc_tail->async_tx.tx_list);
377                         iop_chan->last_used = last_used;
378                         iop_desc_clear_next_desc(alloc_start);
379                         iop_desc_clear_next_desc(alloc_tail);
380                         return alloc_tail;
381                 }
382         }
383         if (!retry++)
384                 goto retry;
385
386         /* perform direct reclaim if the allocation fails */
387         __iop_adma_slot_cleanup(iop_chan);
388
389         return NULL;
390 }
391
392 static dma_cookie_t
393 iop_desc_assign_cookie(struct iop_adma_chan *iop_chan,
394         struct iop_adma_desc_slot *desc)
395 {
396         dma_cookie_t cookie = iop_chan->common.cookie;
397         cookie++;
398         if (cookie < 0)
399                 cookie = 1;
400         iop_chan->common.cookie = desc->async_tx.cookie = cookie;
401         return cookie;
402 }
403
404 static void iop_adma_check_threshold(struct iop_adma_chan *iop_chan)
405 {
406         dev_dbg(iop_chan->device->common.dev, "pending: %d\n",
407                 iop_chan->pending);
408
409         if (iop_chan->pending >= IOP_ADMA_THRESHOLD) {
410                 iop_chan->pending = 0;
411                 iop_chan_append(iop_chan);
412         }
413 }
414
415 static dma_cookie_t
416 iop_adma_tx_submit(struct dma_async_tx_descriptor *tx)
417 {
418         struct iop_adma_desc_slot *sw_desc = tx_to_iop_adma_slot(tx);
419         struct iop_adma_chan *iop_chan = to_iop_adma_chan(tx->chan);
420         struct iop_adma_desc_slot *grp_start, *old_chain_tail;
421         int slot_cnt;
422         int slots_per_op;
423         dma_cookie_t cookie;
424         dma_addr_t next_dma;
425
426         grp_start = sw_desc->group_head;
427         slot_cnt = grp_start->slot_cnt;
428         slots_per_op = grp_start->slots_per_op;
429
430         spin_lock_bh(&iop_chan->lock);
431         cookie = iop_desc_assign_cookie(iop_chan, sw_desc);
432
433         old_chain_tail = list_entry(iop_chan->chain.prev,
434                 struct iop_adma_desc_slot, chain_node);
435         list_splice_init(&sw_desc->async_tx.tx_list,
436                          &old_chain_tail->chain_node);
437
438         /* fix up the hardware chain */
439         next_dma = grp_start->async_tx.phys;
440         iop_desc_set_next_desc(old_chain_tail, next_dma);
441         BUG_ON(iop_desc_get_next_desc(old_chain_tail) != next_dma); /* flush */
442
443         /* check for pre-chained descriptors */
444         iop_paranoia(iop_desc_get_next_desc(sw_desc));
445
446         /* increment the pending count by the number of slots
447          * memcpy operations have a 1:1 (slot:operation) relation
448          * other operations are heavier and will pop the threshold
449          * more often.
450          */
451         iop_chan->pending += slot_cnt;
452         iop_adma_check_threshold(iop_chan);
453         spin_unlock_bh(&iop_chan->lock);
454
455         dev_dbg(iop_chan->device->common.dev, "%s cookie: %d slot: %d\n",
456                 __func__, sw_desc->async_tx.cookie, sw_desc->idx);
457
458         return cookie;
459 }
460
461 static void iop_chan_start_null_memcpy(struct iop_adma_chan *iop_chan);
462 static void iop_chan_start_null_xor(struct iop_adma_chan *iop_chan);
463
464 /**
465  * iop_adma_alloc_chan_resources -  returns the number of allocated descriptors
466  * @chan - allocate descriptor resources for this channel
467  * @client - current client requesting the channel be ready for requests
468  *
469  * Note: We keep the slots for 1 operation on iop_chan->chain at all times.  To
470  * avoid deadlock, via async_xor, num_descs_in_pool must at a minimum be
471  * greater than 2x the number slots needed to satisfy a device->max_xor
472  * request.
473  * */
474 static int iop_adma_alloc_chan_resources(struct dma_chan *chan,
475                                          struct dma_client *client)
476 {
477         char *hw_desc;
478         int idx;
479         struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
480         struct iop_adma_desc_slot *slot = NULL;
481         int init = iop_chan->slots_allocated ? 0 : 1;
482         struct iop_adma_platform_data *plat_data =
483                 iop_chan->device->pdev->dev.platform_data;
484         int num_descs_in_pool = plat_data->pool_size/IOP_ADMA_SLOT_SIZE;
485
486         /* Allocate descriptor slots */
487         do {
488                 idx = iop_chan->slots_allocated;
489                 if (idx == num_descs_in_pool)
490                         break;
491
492                 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
493                 if (!slot) {
494                         printk(KERN_INFO "IOP ADMA Channel only initialized"
495                                 " %d descriptor slots", idx);
496                         break;
497                 }
498                 hw_desc = (char *) iop_chan->device->dma_desc_pool_virt;
499                 slot->hw_desc = (void *) &hw_desc[idx * IOP_ADMA_SLOT_SIZE];
500
501                 dma_async_tx_descriptor_init(&slot->async_tx, chan);
502                 slot->async_tx.tx_submit = iop_adma_tx_submit;
503                 INIT_LIST_HEAD(&slot->chain_node);
504                 INIT_LIST_HEAD(&slot->slot_node);
505                 INIT_LIST_HEAD(&slot->async_tx.tx_list);
506                 hw_desc = (char *) iop_chan->device->dma_desc_pool;
507                 slot->async_tx.phys =
508                         (dma_addr_t) &hw_desc[idx * IOP_ADMA_SLOT_SIZE];
509                 slot->idx = idx;
510
511                 spin_lock_bh(&iop_chan->lock);
512                 iop_chan->slots_allocated++;
513                 list_add_tail(&slot->slot_node, &iop_chan->all_slots);
514                 spin_unlock_bh(&iop_chan->lock);
515         } while (iop_chan->slots_allocated < num_descs_in_pool);
516
517         if (idx && !iop_chan->last_used)
518                 iop_chan->last_used = list_entry(iop_chan->all_slots.next,
519                                         struct iop_adma_desc_slot,
520                                         slot_node);
521
522         dev_dbg(iop_chan->device->common.dev,
523                 "allocated %d descriptor slots last_used: %p\n",
524                 iop_chan->slots_allocated, iop_chan->last_used);
525
526         /* initialize the channel and the chain with a null operation */
527         if (init) {
528                 if (dma_has_cap(DMA_MEMCPY,
529                         iop_chan->device->common.cap_mask))
530                         iop_chan_start_null_memcpy(iop_chan);
531                 else if (dma_has_cap(DMA_XOR,
532                         iop_chan->device->common.cap_mask))
533                         iop_chan_start_null_xor(iop_chan);
534                 else
535                         BUG();
536         }
537
538         return (idx > 0) ? idx : -ENOMEM;
539 }
540
541 static struct dma_async_tx_descriptor *
542 iop_adma_prep_dma_interrupt(struct dma_chan *chan, unsigned long flags)
543 {
544         struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
545         struct iop_adma_desc_slot *sw_desc, *grp_start;
546         int slot_cnt, slots_per_op;
547
548         dev_dbg(iop_chan->device->common.dev, "%s\n", __func__);
549
550         spin_lock_bh(&iop_chan->lock);
551         slot_cnt = iop_chan_interrupt_slot_count(&slots_per_op, iop_chan);
552         sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
553         if (sw_desc) {
554                 grp_start = sw_desc->group_head;
555                 iop_desc_init_interrupt(grp_start, iop_chan);
556                 grp_start->unmap_len = 0;
557                 sw_desc->async_tx.flags = flags;
558         }
559         spin_unlock_bh(&iop_chan->lock);
560
561         return sw_desc ? &sw_desc->async_tx : NULL;
562 }
563
564 static struct dma_async_tx_descriptor *
565 iop_adma_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dma_dest,
566                          dma_addr_t dma_src, size_t len, unsigned long flags)
567 {
568         struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
569         struct iop_adma_desc_slot *sw_desc, *grp_start;
570         int slot_cnt, slots_per_op;
571
572         if (unlikely(!len))
573                 return NULL;
574         BUG_ON(unlikely(len > IOP_ADMA_MAX_BYTE_COUNT));
575
576         dev_dbg(iop_chan->device->common.dev, "%s len: %u\n",
577                 __func__, len);
578
579         spin_lock_bh(&iop_chan->lock);
580         slot_cnt = iop_chan_memcpy_slot_count(len, &slots_per_op);
581         sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
582         if (sw_desc) {
583                 grp_start = sw_desc->group_head;
584                 iop_desc_init_memcpy(grp_start, flags);
585                 iop_desc_set_byte_count(grp_start, iop_chan, len);
586                 iop_desc_set_dest_addr(grp_start, iop_chan, dma_dest);
587                 iop_desc_set_memcpy_src_addr(grp_start, dma_src);
588                 sw_desc->unmap_src_cnt = 1;
589                 sw_desc->unmap_len = len;
590                 sw_desc->async_tx.flags = flags;
591         }
592         spin_unlock_bh(&iop_chan->lock);
593
594         return sw_desc ? &sw_desc->async_tx : NULL;
595 }
596
597 static struct dma_async_tx_descriptor *
598 iop_adma_prep_dma_memset(struct dma_chan *chan, dma_addr_t dma_dest,
599                          int value, size_t len, unsigned long flags)
600 {
601         struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
602         struct iop_adma_desc_slot *sw_desc, *grp_start;
603         int slot_cnt, slots_per_op;
604
605         if (unlikely(!len))
606                 return NULL;
607         BUG_ON(unlikely(len > IOP_ADMA_MAX_BYTE_COUNT));
608
609         dev_dbg(iop_chan->device->common.dev, "%s len: %u\n",
610                 __func__, len);
611
612         spin_lock_bh(&iop_chan->lock);
613         slot_cnt = iop_chan_memset_slot_count(len, &slots_per_op);
614         sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
615         if (sw_desc) {
616                 grp_start = sw_desc->group_head;
617                 iop_desc_init_memset(grp_start, flags);
618                 iop_desc_set_byte_count(grp_start, iop_chan, len);
619                 iop_desc_set_block_fill_val(grp_start, value);
620                 iop_desc_set_dest_addr(grp_start, iop_chan, dma_dest);
621                 sw_desc->unmap_src_cnt = 1;
622                 sw_desc->unmap_len = len;
623                 sw_desc->async_tx.flags = flags;
624         }
625         spin_unlock_bh(&iop_chan->lock);
626
627         return sw_desc ? &sw_desc->async_tx : NULL;
628 }
629
630 static struct dma_async_tx_descriptor *
631 iop_adma_prep_dma_xor(struct dma_chan *chan, dma_addr_t dma_dest,
632                       dma_addr_t *dma_src, unsigned int src_cnt, size_t len,
633                       unsigned long flags)
634 {
635         struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
636         struct iop_adma_desc_slot *sw_desc, *grp_start;
637         int slot_cnt, slots_per_op;
638
639         if (unlikely(!len))
640                 return NULL;
641         BUG_ON(unlikely(len > IOP_ADMA_XOR_MAX_BYTE_COUNT));
642
643         dev_dbg(iop_chan->device->common.dev,
644                 "%s src_cnt: %d len: %u flags: %lx\n",
645                 __func__, src_cnt, len, flags);
646
647         spin_lock_bh(&iop_chan->lock);
648         slot_cnt = iop_chan_xor_slot_count(len, src_cnt, &slots_per_op);
649         sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
650         if (sw_desc) {
651                 grp_start = sw_desc->group_head;
652                 iop_desc_init_xor(grp_start, src_cnt, flags);
653                 iop_desc_set_byte_count(grp_start, iop_chan, len);
654                 iop_desc_set_dest_addr(grp_start, iop_chan, dma_dest);
655                 sw_desc->unmap_src_cnt = src_cnt;
656                 sw_desc->unmap_len = len;
657                 sw_desc->async_tx.flags = flags;
658                 while (src_cnt--)
659                         iop_desc_set_xor_src_addr(grp_start, src_cnt,
660                                                   dma_src[src_cnt]);
661         }
662         spin_unlock_bh(&iop_chan->lock);
663
664         return sw_desc ? &sw_desc->async_tx : NULL;
665 }
666
667 static struct dma_async_tx_descriptor *
668 iop_adma_prep_dma_zero_sum(struct dma_chan *chan, dma_addr_t *dma_src,
669                            unsigned int src_cnt, size_t len, u32 *result,
670                            unsigned long flags)
671 {
672         struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
673         struct iop_adma_desc_slot *sw_desc, *grp_start;
674         int slot_cnt, slots_per_op;
675
676         if (unlikely(!len))
677                 return NULL;
678
679         dev_dbg(iop_chan->device->common.dev, "%s src_cnt: %d len: %u\n",
680                 __func__, src_cnt, len);
681
682         spin_lock_bh(&iop_chan->lock);
683         slot_cnt = iop_chan_zero_sum_slot_count(len, src_cnt, &slots_per_op);
684         sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
685         if (sw_desc) {
686                 grp_start = sw_desc->group_head;
687                 iop_desc_init_zero_sum(grp_start, src_cnt, flags);
688                 iop_desc_set_zero_sum_byte_count(grp_start, len);
689                 grp_start->xor_check_result = result;
690                 pr_debug("\t%s: grp_start->xor_check_result: %p\n",
691                         __func__, grp_start->xor_check_result);
692                 sw_desc->unmap_src_cnt = src_cnt;
693                 sw_desc->unmap_len = len;
694                 sw_desc->async_tx.flags = flags;
695                 while (src_cnt--)
696                         iop_desc_set_zero_sum_src_addr(grp_start, src_cnt,
697                                                        dma_src[src_cnt]);
698         }
699         spin_unlock_bh(&iop_chan->lock);
700
701         return sw_desc ? &sw_desc->async_tx : NULL;
702 }
703
704 static void iop_adma_free_chan_resources(struct dma_chan *chan)
705 {
706         struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
707         struct iop_adma_desc_slot *iter, *_iter;
708         int in_use_descs = 0;
709
710         iop_adma_slot_cleanup(iop_chan);
711
712         spin_lock_bh(&iop_chan->lock);
713         list_for_each_entry_safe(iter, _iter, &iop_chan->chain,
714                                         chain_node) {
715                 in_use_descs++;
716                 list_del(&iter->chain_node);
717         }
718         list_for_each_entry_safe_reverse(
719                 iter, _iter, &iop_chan->all_slots, slot_node) {
720                 list_del(&iter->slot_node);
721                 kfree(iter);
722                 iop_chan->slots_allocated--;
723         }
724         iop_chan->last_used = NULL;
725
726         dev_dbg(iop_chan->device->common.dev, "%s slots_allocated %d\n",
727                 __func__, iop_chan->slots_allocated);
728         spin_unlock_bh(&iop_chan->lock);
729
730         /* one is ok since we left it on there on purpose */
731         if (in_use_descs > 1)
732                 printk(KERN_ERR "IOP: Freeing %d in use descriptors!\n",
733                         in_use_descs - 1);
734 }
735
736 /**
737  * iop_adma_is_complete - poll the status of an ADMA transaction
738  * @chan: ADMA channel handle
739  * @cookie: ADMA transaction identifier
740  */
741 static enum dma_status iop_adma_is_complete(struct dma_chan *chan,
742                                         dma_cookie_t cookie,
743                                         dma_cookie_t *done,
744                                         dma_cookie_t *used)
745 {
746         struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
747         dma_cookie_t last_used;
748         dma_cookie_t last_complete;
749         enum dma_status ret;
750
751         last_used = chan->cookie;
752         last_complete = iop_chan->completed_cookie;
753
754         if (done)
755                 *done = last_complete;
756         if (used)
757                 *used = last_used;
758
759         ret = dma_async_is_complete(cookie, last_complete, last_used);
760         if (ret == DMA_SUCCESS)
761                 return ret;
762
763         iop_adma_slot_cleanup(iop_chan);
764
765         last_used = chan->cookie;
766         last_complete = iop_chan->completed_cookie;
767
768         if (done)
769                 *done = last_complete;
770         if (used)
771                 *used = last_used;
772
773         return dma_async_is_complete(cookie, last_complete, last_used);
774 }
775
776 static irqreturn_t iop_adma_eot_handler(int irq, void *data)
777 {
778         struct iop_adma_chan *chan = data;
779
780         dev_dbg(chan->device->common.dev, "%s\n", __func__);
781
782         tasklet_schedule(&chan->irq_tasklet);
783
784         iop_adma_device_clear_eot_status(chan);
785
786         return IRQ_HANDLED;
787 }
788
789 static irqreturn_t iop_adma_eoc_handler(int irq, void *data)
790 {
791         struct iop_adma_chan *chan = data;
792
793         dev_dbg(chan->device->common.dev, "%s\n", __func__);
794
795         tasklet_schedule(&chan->irq_tasklet);
796
797         iop_adma_device_clear_eoc_status(chan);
798
799         return IRQ_HANDLED;
800 }
801
802 static irqreturn_t iop_adma_err_handler(int irq, void *data)
803 {
804         struct iop_adma_chan *chan = data;
805         unsigned long status = iop_chan_get_status(chan);
806
807         dev_printk(KERN_ERR, chan->device->common.dev,
808                 "error ( %s%s%s%s%s%s%s)\n",
809                 iop_is_err_int_parity(status, chan) ? "int_parity " : "",
810                 iop_is_err_mcu_abort(status, chan) ? "mcu_abort " : "",
811                 iop_is_err_int_tabort(status, chan) ? "int_tabort " : "",
812                 iop_is_err_int_mabort(status, chan) ? "int_mabort " : "",
813                 iop_is_err_pci_tabort(status, chan) ? "pci_tabort " : "",
814                 iop_is_err_pci_mabort(status, chan) ? "pci_mabort " : "",
815                 iop_is_err_split_tx(status, chan) ? "split_tx " : "");
816
817         iop_adma_device_clear_err_status(chan);
818
819         BUG();
820
821         return IRQ_HANDLED;
822 }
823
824 static void iop_adma_issue_pending(struct dma_chan *chan)
825 {
826         struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
827
828         if (iop_chan->pending) {
829                 iop_chan->pending = 0;
830                 iop_chan_append(iop_chan);
831         }
832 }
833
834 /*
835  * Perform a transaction to verify the HW works.
836  */
837 #define IOP_ADMA_TEST_SIZE 2000
838
839 static int __devinit iop_adma_memcpy_self_test(struct iop_adma_device *device)
840 {
841         int i;
842         void *src, *dest;
843         dma_addr_t src_dma, dest_dma;
844         struct dma_chan *dma_chan;
845         dma_cookie_t cookie;
846         struct dma_async_tx_descriptor *tx;
847         int err = 0;
848         struct iop_adma_chan *iop_chan;
849
850         dev_dbg(device->common.dev, "%s\n", __func__);
851
852         src = kmalloc(IOP_ADMA_TEST_SIZE, GFP_KERNEL);
853         if (!src)
854                 return -ENOMEM;
855         dest = kzalloc(IOP_ADMA_TEST_SIZE, GFP_KERNEL);
856         if (!dest) {
857                 kfree(src);
858                 return -ENOMEM;
859         }
860
861         /* Fill in src buffer */
862         for (i = 0; i < IOP_ADMA_TEST_SIZE; i++)
863                 ((u8 *) src)[i] = (u8)i;
864
865         /* Start copy, using first DMA channel */
866         dma_chan = container_of(device->common.channels.next,
867                                 struct dma_chan,
868                                 device_node);
869         if (iop_adma_alloc_chan_resources(dma_chan, NULL) < 1) {
870                 err = -ENODEV;
871                 goto out;
872         }
873
874         dest_dma = dma_map_single(dma_chan->device->dev, dest,
875                                 IOP_ADMA_TEST_SIZE, DMA_FROM_DEVICE);
876         src_dma = dma_map_single(dma_chan->device->dev, src,
877                                 IOP_ADMA_TEST_SIZE, DMA_TO_DEVICE);
878         tx = iop_adma_prep_dma_memcpy(dma_chan, dest_dma, src_dma,
879                                       IOP_ADMA_TEST_SIZE,
880                                       DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
881
882         cookie = iop_adma_tx_submit(tx);
883         iop_adma_issue_pending(dma_chan);
884         msleep(1);
885
886         if (iop_adma_is_complete(dma_chan, cookie, NULL, NULL) !=
887                         DMA_SUCCESS) {
888                 dev_printk(KERN_ERR, dma_chan->device->dev,
889                         "Self-test copy timed out, disabling\n");
890                 err = -ENODEV;
891                 goto free_resources;
892         }
893
894         iop_chan = to_iop_adma_chan(dma_chan);
895         dma_sync_single_for_cpu(&iop_chan->device->pdev->dev, dest_dma,
896                 IOP_ADMA_TEST_SIZE, DMA_FROM_DEVICE);
897         if (memcmp(src, dest, IOP_ADMA_TEST_SIZE)) {
898                 dev_printk(KERN_ERR, dma_chan->device->dev,
899                         "Self-test copy failed compare, disabling\n");
900                 err = -ENODEV;
901                 goto free_resources;
902         }
903
904 free_resources:
905         iop_adma_free_chan_resources(dma_chan);
906 out:
907         kfree(src);
908         kfree(dest);
909         return err;
910 }
911
912 #define IOP_ADMA_NUM_SRC_TEST 4 /* must be <= 15 */
913 static int __devinit
914 iop_adma_xor_zero_sum_self_test(struct iop_adma_device *device)
915 {
916         int i, src_idx;
917         struct page *dest;
918         struct page *xor_srcs[IOP_ADMA_NUM_SRC_TEST];
919         struct page *zero_sum_srcs[IOP_ADMA_NUM_SRC_TEST + 1];
920         dma_addr_t dma_srcs[IOP_ADMA_NUM_SRC_TEST + 1];
921         dma_addr_t dma_addr, dest_dma;
922         struct dma_async_tx_descriptor *tx;
923         struct dma_chan *dma_chan;
924         dma_cookie_t cookie;
925         u8 cmp_byte = 0;
926         u32 cmp_word;
927         u32 zero_sum_result;
928         int err = 0;
929         struct iop_adma_chan *iop_chan;
930
931         dev_dbg(device->common.dev, "%s\n", __func__);
932
933         for (src_idx = 0; src_idx < IOP_ADMA_NUM_SRC_TEST; src_idx++) {
934                 xor_srcs[src_idx] = alloc_page(GFP_KERNEL);
935                 if (!xor_srcs[src_idx])
936                         while (src_idx--) {
937                                 __free_page(xor_srcs[src_idx]);
938                                 return -ENOMEM;
939                         }
940         }
941
942         dest = alloc_page(GFP_KERNEL);
943         if (!dest)
944                 while (src_idx--) {
945                         __free_page(xor_srcs[src_idx]);
946                         return -ENOMEM;
947                 }
948
949         /* Fill in src buffers */
950         for (src_idx = 0; src_idx < IOP_ADMA_NUM_SRC_TEST; src_idx++) {
951                 u8 *ptr = page_address(xor_srcs[src_idx]);
952                 for (i = 0; i < PAGE_SIZE; i++)
953                         ptr[i] = (1 << src_idx);
954         }
955
956         for (src_idx = 0; src_idx < IOP_ADMA_NUM_SRC_TEST; src_idx++)
957                 cmp_byte ^= (u8) (1 << src_idx);
958
959         cmp_word = (cmp_byte << 24) | (cmp_byte << 16) |
960                         (cmp_byte << 8) | cmp_byte;
961
962         memset(page_address(dest), 0, PAGE_SIZE);
963
964         dma_chan = container_of(device->common.channels.next,
965                                 struct dma_chan,
966                                 device_node);
967         if (iop_adma_alloc_chan_resources(dma_chan, NULL) < 1) {
968                 err = -ENODEV;
969                 goto out;
970         }
971
972         /* test xor */
973         dest_dma = dma_map_page(dma_chan->device->dev, dest, 0,
974                                 PAGE_SIZE, DMA_FROM_DEVICE);
975         for (i = 0; i < IOP_ADMA_NUM_SRC_TEST; i++)
976                 dma_srcs[i] = dma_map_page(dma_chan->device->dev, xor_srcs[i],
977                                            0, PAGE_SIZE, DMA_TO_DEVICE);
978         tx = iop_adma_prep_dma_xor(dma_chan, dest_dma, dma_srcs,
979                                    IOP_ADMA_NUM_SRC_TEST, PAGE_SIZE,
980                                    DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
981
982         cookie = iop_adma_tx_submit(tx);
983         iop_adma_issue_pending(dma_chan);
984         msleep(8);
985
986         if (iop_adma_is_complete(dma_chan, cookie, NULL, NULL) !=
987                 DMA_SUCCESS) {
988                 dev_printk(KERN_ERR, dma_chan->device->dev,
989                         "Self-test xor timed out, disabling\n");
990                 err = -ENODEV;
991                 goto free_resources;
992         }
993
994         iop_chan = to_iop_adma_chan(dma_chan);
995         dma_sync_single_for_cpu(&iop_chan->device->pdev->dev, dest_dma,
996                 PAGE_SIZE, DMA_FROM_DEVICE);
997         for (i = 0; i < (PAGE_SIZE / sizeof(u32)); i++) {
998                 u32 *ptr = page_address(dest);
999                 if (ptr[i] != cmp_word) {
1000                         dev_printk(KERN_ERR, dma_chan->device->dev,
1001                                 "Self-test xor failed compare, disabling\n");
1002                         err = -ENODEV;
1003                         goto free_resources;
1004                 }
1005         }
1006         dma_sync_single_for_device(&iop_chan->device->pdev->dev, dest_dma,
1007                 PAGE_SIZE, DMA_TO_DEVICE);
1008
1009         /* skip zero sum if the capability is not present */
1010         if (!dma_has_cap(DMA_ZERO_SUM, dma_chan->device->cap_mask))
1011                 goto free_resources;
1012
1013         /* zero sum the sources with the destintation page */
1014         for (i = 0; i < IOP_ADMA_NUM_SRC_TEST; i++)
1015                 zero_sum_srcs[i] = xor_srcs[i];
1016         zero_sum_srcs[i] = dest;
1017
1018         zero_sum_result = 1;
1019
1020         for (i = 0; i < IOP_ADMA_NUM_SRC_TEST + 1; i++)
1021                 dma_srcs[i] = dma_map_page(dma_chan->device->dev,
1022                                            zero_sum_srcs[i], 0, PAGE_SIZE,
1023                                            DMA_TO_DEVICE);
1024         tx = iop_adma_prep_dma_zero_sum(dma_chan, dma_srcs,
1025                                         IOP_ADMA_NUM_SRC_TEST + 1, PAGE_SIZE,
1026                                         &zero_sum_result,
1027                                         DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1028
1029         cookie = iop_adma_tx_submit(tx);
1030         iop_adma_issue_pending(dma_chan);
1031         msleep(8);
1032
1033         if (iop_adma_is_complete(dma_chan, cookie, NULL, NULL) != DMA_SUCCESS) {
1034                 dev_printk(KERN_ERR, dma_chan->device->dev,
1035                         "Self-test zero sum timed out, disabling\n");
1036                 err = -ENODEV;
1037                 goto free_resources;
1038         }
1039
1040         if (zero_sum_result != 0) {
1041                 dev_printk(KERN_ERR, dma_chan->device->dev,
1042                         "Self-test zero sum failed compare, disabling\n");
1043                 err = -ENODEV;
1044                 goto free_resources;
1045         }
1046
1047         /* test memset */
1048         dma_addr = dma_map_page(dma_chan->device->dev, dest, 0,
1049                         PAGE_SIZE, DMA_FROM_DEVICE);
1050         tx = iop_adma_prep_dma_memset(dma_chan, dma_addr, 0, PAGE_SIZE,
1051                                       DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1052
1053         cookie = iop_adma_tx_submit(tx);
1054         iop_adma_issue_pending(dma_chan);
1055         msleep(8);
1056
1057         if (iop_adma_is_complete(dma_chan, cookie, NULL, NULL) != DMA_SUCCESS) {
1058                 dev_printk(KERN_ERR, dma_chan->device->dev,
1059                         "Self-test memset timed out, disabling\n");
1060                 err = -ENODEV;
1061                 goto free_resources;
1062         }
1063
1064         for (i = 0; i < PAGE_SIZE/sizeof(u32); i++) {
1065                 u32 *ptr = page_address(dest);
1066                 if (ptr[i]) {
1067                         dev_printk(KERN_ERR, dma_chan->device->dev,
1068                                 "Self-test memset failed compare, disabling\n");
1069                         err = -ENODEV;
1070                         goto free_resources;
1071                 }
1072         }
1073
1074         /* test for non-zero parity sum */
1075         zero_sum_result = 0;
1076         for (i = 0; i < IOP_ADMA_NUM_SRC_TEST + 1; i++)
1077                 dma_srcs[i] = dma_map_page(dma_chan->device->dev,
1078                                            zero_sum_srcs[i], 0, PAGE_SIZE,
1079                                            DMA_TO_DEVICE);
1080         tx = iop_adma_prep_dma_zero_sum(dma_chan, dma_srcs,
1081                                         IOP_ADMA_NUM_SRC_TEST + 1, PAGE_SIZE,
1082                                         &zero_sum_result,
1083                                         DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1084
1085         cookie = iop_adma_tx_submit(tx);
1086         iop_adma_issue_pending(dma_chan);
1087         msleep(8);
1088
1089         if (iop_adma_is_complete(dma_chan, cookie, NULL, NULL) != DMA_SUCCESS) {
1090                 dev_printk(KERN_ERR, dma_chan->device->dev,
1091                         "Self-test non-zero sum timed out, disabling\n");
1092                 err = -ENODEV;
1093                 goto free_resources;
1094         }
1095
1096         if (zero_sum_result != 1) {
1097                 dev_printk(KERN_ERR, dma_chan->device->dev,
1098                         "Self-test non-zero sum failed compare, disabling\n");
1099                 err = -ENODEV;
1100                 goto free_resources;
1101         }
1102
1103 free_resources:
1104         iop_adma_free_chan_resources(dma_chan);
1105 out:
1106         src_idx = IOP_ADMA_NUM_SRC_TEST;
1107         while (src_idx--)
1108                 __free_page(xor_srcs[src_idx]);
1109         __free_page(dest);
1110         return err;
1111 }
1112
1113 static int __devexit iop_adma_remove(struct platform_device *dev)
1114 {
1115         struct iop_adma_device *device = platform_get_drvdata(dev);
1116         struct dma_chan *chan, *_chan;
1117         struct iop_adma_chan *iop_chan;
1118         int i;
1119         struct iop_adma_platform_data *plat_data = dev->dev.platform_data;
1120
1121         dma_async_device_unregister(&device->common);
1122
1123         for (i = 0; i < 3; i++) {
1124                 unsigned int irq;
1125                 irq = platform_get_irq(dev, i);
1126                 free_irq(irq, device);
1127         }
1128
1129         dma_free_coherent(&dev->dev, plat_data->pool_size,
1130                         device->dma_desc_pool_virt, device->dma_desc_pool);
1131
1132         do {
1133                 struct resource *res;
1134                 res = platform_get_resource(dev, IORESOURCE_MEM, 0);
1135                 release_mem_region(res->start, res->end - res->start);
1136         } while (0);
1137
1138         list_for_each_entry_safe(chan, _chan, &device->common.channels,
1139                                 device_node) {
1140                 iop_chan = to_iop_adma_chan(chan);
1141                 list_del(&chan->device_node);
1142                 kfree(iop_chan);
1143         }
1144         kfree(device);
1145
1146         return 0;
1147 }
1148
1149 static int __devinit iop_adma_probe(struct platform_device *pdev)
1150 {
1151         struct resource *res;
1152         int ret = 0, i;
1153         struct iop_adma_device *adev;
1154         struct iop_adma_chan *iop_chan;
1155         struct dma_device *dma_dev;
1156         struct iop_adma_platform_data *plat_data = pdev->dev.platform_data;
1157
1158         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1159         if (!res)
1160                 return -ENODEV;
1161
1162         if (!devm_request_mem_region(&pdev->dev, res->start,
1163                                 res->end - res->start, pdev->name))
1164                 return -EBUSY;
1165
1166         adev = kzalloc(sizeof(*adev), GFP_KERNEL);
1167         if (!adev)
1168                 return -ENOMEM;
1169         dma_dev = &adev->common;
1170
1171         /* allocate coherent memory for hardware descriptors
1172          * note: writecombine gives slightly better performance, but
1173          * requires that we explicitly flush the writes
1174          */
1175         if ((adev->dma_desc_pool_virt = dma_alloc_writecombine(&pdev->dev,
1176                                         plat_data->pool_size,
1177                                         &adev->dma_desc_pool,
1178                                         GFP_KERNEL)) == NULL) {
1179                 ret = -ENOMEM;
1180                 goto err_free_adev;
1181         }
1182
1183         dev_dbg(&pdev->dev, "%s: allocted descriptor pool virt %p phys %p\n",
1184                 __func__, adev->dma_desc_pool_virt,
1185                 (void *) adev->dma_desc_pool);
1186
1187         adev->id = plat_data->hw_id;
1188
1189         /* discover transaction capabilites from the platform data */
1190         dma_dev->cap_mask = plat_data->cap_mask;
1191
1192         adev->pdev = pdev;
1193         platform_set_drvdata(pdev, adev);
1194
1195         INIT_LIST_HEAD(&dma_dev->channels);
1196
1197         /* set base routines */
1198         dma_dev->device_alloc_chan_resources = iop_adma_alloc_chan_resources;
1199         dma_dev->device_free_chan_resources = iop_adma_free_chan_resources;
1200         dma_dev->device_is_tx_complete = iop_adma_is_complete;
1201         dma_dev->device_issue_pending = iop_adma_issue_pending;
1202         dma_dev->dev = &pdev->dev;
1203
1204         /* set prep routines based on capability */
1205         if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask))
1206                 dma_dev->device_prep_dma_memcpy = iop_adma_prep_dma_memcpy;
1207         if (dma_has_cap(DMA_MEMSET, dma_dev->cap_mask))
1208                 dma_dev->device_prep_dma_memset = iop_adma_prep_dma_memset;
1209         if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) {
1210                 dma_dev->max_xor = iop_adma_get_max_xor();
1211                 dma_dev->device_prep_dma_xor = iop_adma_prep_dma_xor;
1212         }
1213         if (dma_has_cap(DMA_ZERO_SUM, dma_dev->cap_mask))
1214                 dma_dev->device_prep_dma_zero_sum =
1215                         iop_adma_prep_dma_zero_sum;
1216         if (dma_has_cap(DMA_INTERRUPT, dma_dev->cap_mask))
1217                 dma_dev->device_prep_dma_interrupt =
1218                         iop_adma_prep_dma_interrupt;
1219
1220         iop_chan = kzalloc(sizeof(*iop_chan), GFP_KERNEL);
1221         if (!iop_chan) {
1222                 ret = -ENOMEM;
1223                 goto err_free_dma;
1224         }
1225         iop_chan->device = adev;
1226
1227         iop_chan->mmr_base = devm_ioremap(&pdev->dev, res->start,
1228                                         res->end - res->start);
1229         if (!iop_chan->mmr_base) {
1230                 ret = -ENOMEM;
1231                 goto err_free_iop_chan;
1232         }
1233         tasklet_init(&iop_chan->irq_tasklet, iop_adma_tasklet, (unsigned long)
1234                 iop_chan);
1235
1236         /* clear errors before enabling interrupts */
1237         iop_adma_device_clear_err_status(iop_chan);
1238
1239         for (i = 0; i < 3; i++) {
1240                 irq_handler_t handler[] = { iop_adma_eot_handler,
1241                                         iop_adma_eoc_handler,
1242                                         iop_adma_err_handler };
1243                 int irq = platform_get_irq(pdev, i);
1244                 if (irq < 0) {
1245                         ret = -ENXIO;
1246                         goto err_free_iop_chan;
1247                 } else {
1248                         ret = devm_request_irq(&pdev->dev, irq,
1249                                         handler[i], 0, pdev->name, iop_chan);
1250                         if (ret)
1251                                 goto err_free_iop_chan;
1252                 }
1253         }
1254
1255         spin_lock_init(&iop_chan->lock);
1256         INIT_LIST_HEAD(&iop_chan->chain);
1257         INIT_LIST_HEAD(&iop_chan->all_slots);
1258         INIT_RCU_HEAD(&iop_chan->common.rcu);
1259         iop_chan->common.device = dma_dev;
1260         list_add_tail(&iop_chan->common.device_node, &dma_dev->channels);
1261
1262         if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask)) {
1263                 ret = iop_adma_memcpy_self_test(adev);
1264                 dev_dbg(&pdev->dev, "memcpy self test returned %d\n", ret);
1265                 if (ret)
1266                         goto err_free_iop_chan;
1267         }
1268
1269         if (dma_has_cap(DMA_XOR, dma_dev->cap_mask) ||
1270                 dma_has_cap(DMA_MEMSET, dma_dev->cap_mask)) {
1271                 ret = iop_adma_xor_zero_sum_self_test(adev);
1272                 dev_dbg(&pdev->dev, "xor self test returned %d\n", ret);
1273                 if (ret)
1274                         goto err_free_iop_chan;
1275         }
1276
1277         dev_printk(KERN_INFO, &pdev->dev, "Intel(R) IOP: "
1278           "( %s%s%s%s%s%s%s%s%s%s)\n",
1279           dma_has_cap(DMA_PQ_XOR, dma_dev->cap_mask) ? "pq_xor " : "",
1280           dma_has_cap(DMA_PQ_UPDATE, dma_dev->cap_mask) ? "pq_update " : "",
1281           dma_has_cap(DMA_PQ_ZERO_SUM, dma_dev->cap_mask) ? "pq_zero_sum " : "",
1282           dma_has_cap(DMA_XOR, dma_dev->cap_mask) ? "xor " : "",
1283           dma_has_cap(DMA_DUAL_XOR, dma_dev->cap_mask) ? "dual_xor " : "",
1284           dma_has_cap(DMA_ZERO_SUM, dma_dev->cap_mask) ? "xor_zero_sum " : "",
1285           dma_has_cap(DMA_MEMSET, dma_dev->cap_mask)  ? "fill " : "",
1286           dma_has_cap(DMA_MEMCPY_CRC32C, dma_dev->cap_mask) ? "cpy+crc " : "",
1287           dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask) ? "cpy " : "",
1288           dma_has_cap(DMA_INTERRUPT, dma_dev->cap_mask) ? "intr " : "");
1289
1290         dma_async_device_register(dma_dev);
1291         goto out;
1292
1293  err_free_iop_chan:
1294         kfree(iop_chan);
1295  err_free_dma:
1296         dma_free_coherent(&adev->pdev->dev, plat_data->pool_size,
1297                         adev->dma_desc_pool_virt, adev->dma_desc_pool);
1298  err_free_adev:
1299         kfree(adev);
1300  out:
1301         return ret;
1302 }
1303
1304 static void iop_chan_start_null_memcpy(struct iop_adma_chan *iop_chan)
1305 {
1306         struct iop_adma_desc_slot *sw_desc, *grp_start;
1307         dma_cookie_t cookie;
1308         int slot_cnt, slots_per_op;
1309
1310         dev_dbg(iop_chan->device->common.dev, "%s\n", __func__);
1311
1312         spin_lock_bh(&iop_chan->lock);
1313         slot_cnt = iop_chan_memcpy_slot_count(0, &slots_per_op);
1314         sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
1315         if (sw_desc) {
1316                 grp_start = sw_desc->group_head;
1317
1318                 list_splice_init(&sw_desc->async_tx.tx_list, &iop_chan->chain);
1319                 async_tx_ack(&sw_desc->async_tx);
1320                 iop_desc_init_memcpy(grp_start, 0);
1321                 iop_desc_set_byte_count(grp_start, iop_chan, 0);
1322                 iop_desc_set_dest_addr(grp_start, iop_chan, 0);
1323                 iop_desc_set_memcpy_src_addr(grp_start, 0);
1324
1325                 cookie = iop_chan->common.cookie;
1326                 cookie++;
1327                 if (cookie <= 1)
1328                         cookie = 2;
1329
1330                 /* initialize the completed cookie to be less than
1331                  * the most recently used cookie
1332                  */
1333                 iop_chan->completed_cookie = cookie - 1;
1334                 iop_chan->common.cookie = sw_desc->async_tx.cookie = cookie;
1335
1336                 /* channel should not be busy */
1337                 BUG_ON(iop_chan_is_busy(iop_chan));
1338
1339                 /* clear any prior error-status bits */
1340                 iop_adma_device_clear_err_status(iop_chan);
1341
1342                 /* disable operation */
1343                 iop_chan_disable(iop_chan);
1344
1345                 /* set the descriptor address */
1346                 iop_chan_set_next_descriptor(iop_chan, sw_desc->async_tx.phys);
1347
1348                 /* 1/ don't add pre-chained descriptors
1349                  * 2/ dummy read to flush next_desc write
1350                  */
1351                 BUG_ON(iop_desc_get_next_desc(sw_desc));
1352
1353                 /* run the descriptor */
1354                 iop_chan_enable(iop_chan);
1355         } else
1356                 dev_printk(KERN_ERR, iop_chan->device->common.dev,
1357                          "failed to allocate null descriptor\n");
1358         spin_unlock_bh(&iop_chan->lock);
1359 }
1360
1361 static void iop_chan_start_null_xor(struct iop_adma_chan *iop_chan)
1362 {
1363         struct iop_adma_desc_slot *sw_desc, *grp_start;
1364         dma_cookie_t cookie;
1365         int slot_cnt, slots_per_op;
1366
1367         dev_dbg(iop_chan->device->common.dev, "%s\n", __func__);
1368
1369         spin_lock_bh(&iop_chan->lock);
1370         slot_cnt = iop_chan_xor_slot_count(0, 2, &slots_per_op);
1371         sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
1372         if (sw_desc) {
1373                 grp_start = sw_desc->group_head;
1374                 list_splice_init(&sw_desc->async_tx.tx_list, &iop_chan->chain);
1375                 async_tx_ack(&sw_desc->async_tx);
1376                 iop_desc_init_null_xor(grp_start, 2, 0);
1377                 iop_desc_set_byte_count(grp_start, iop_chan, 0);
1378                 iop_desc_set_dest_addr(grp_start, iop_chan, 0);
1379                 iop_desc_set_xor_src_addr(grp_start, 0, 0);
1380                 iop_desc_set_xor_src_addr(grp_start, 1, 0);
1381
1382                 cookie = iop_chan->common.cookie;
1383                 cookie++;
1384                 if (cookie <= 1)
1385                         cookie = 2;
1386
1387                 /* initialize the completed cookie to be less than
1388                  * the most recently used cookie
1389                  */
1390                 iop_chan->completed_cookie = cookie - 1;
1391                 iop_chan->common.cookie = sw_desc->async_tx.cookie = cookie;
1392
1393                 /* channel should not be busy */
1394                 BUG_ON(iop_chan_is_busy(iop_chan));
1395
1396                 /* clear any prior error-status bits */
1397                 iop_adma_device_clear_err_status(iop_chan);
1398
1399                 /* disable operation */
1400                 iop_chan_disable(iop_chan);
1401
1402                 /* set the descriptor address */
1403                 iop_chan_set_next_descriptor(iop_chan, sw_desc->async_tx.phys);
1404
1405                 /* 1/ don't add pre-chained descriptors
1406                  * 2/ dummy read to flush next_desc write
1407                  */
1408                 BUG_ON(iop_desc_get_next_desc(sw_desc));
1409
1410                 /* run the descriptor */
1411                 iop_chan_enable(iop_chan);
1412         } else
1413                 dev_printk(KERN_ERR, iop_chan->device->common.dev,
1414                         "failed to allocate null descriptor\n");
1415         spin_unlock_bh(&iop_chan->lock);
1416 }
1417
1418 MODULE_ALIAS("platform:iop-adma");
1419
1420 static struct platform_driver iop_adma_driver = {
1421         .probe          = iop_adma_probe,
1422         .remove         = iop_adma_remove,
1423         .driver         = {
1424                 .owner  = THIS_MODULE,
1425                 .name   = "iop-adma",
1426         },
1427 };
1428
1429 static int __init iop_adma_init (void)
1430 {
1431         return platform_driver_register(&iop_adma_driver);
1432 }
1433
1434 /* it's currently unsafe to unload this module */
1435 #if 0
1436 static void __exit iop_adma_exit (void)
1437 {
1438         platform_driver_unregister(&iop_adma_driver);
1439         return;
1440 }
1441 module_exit(iop_adma_exit);
1442 #endif
1443
1444 module_init(iop_adma_init);
1445
1446 MODULE_AUTHOR("Intel Corporation");
1447 MODULE_DESCRIPTION("IOP ADMA Engine Driver");
1448 MODULE_LICENSE("GPL");