blob: 998826854fddeba51a4acb3ea62e57723f43f285 [file] [log] [blame]
Dan Williamsc2110922007-01-02 13:52:26 -07001/*
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 *
Dan Williamsc2110922007-01-02 13:52:26 -070014 */
15
16/*
17 * This driver supports the asynchrounous DMA copy and RAID engines available
18 * on the Intel Xscale(R) family of I/O Processors (IOP 32x, 33x, 134x)
19 */
20
21#include <linux/init.h>
22#include <linux/module.h>
Dan Williamsc2110922007-01-02 13:52:26 -070023#include <linux/delay.h>
24#include <linux/dma-mapping.h>
25#include <linux/spinlock.h>
26#include <linux/interrupt.h>
27#include <linux/platform_device.h>
28#include <linux/memory.h>
29#include <linux/ioport.h>
Dan Williamsf6dbf652009-08-29 19:12:40 -070030#include <linux/raid/pq.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090031#include <linux/slab.h>
Dan Williamsc2110922007-01-02 13:52:26 -070032
Russell Kinga09e64f2008-08-05 16:14:15 +010033#include <mach/adma.h>
Dan Williamsc2110922007-01-02 13:52:26 -070034
Russell King - ARM Linuxd2ebfb32012-03-06 22:34:26 +000035#include "dmaengine.h"
36
Dan Williamsc2110922007-01-02 13:52:26 -070037#define to_iop_adma_chan(chan) container_of(chan, struct iop_adma_chan, common)
38#define to_iop_adma_device(dev) \
39 container_of(dev, struct iop_adma_device, common)
40#define tx_to_iop_adma_slot(tx) \
41 container_of(tx, struct iop_adma_desc_slot, async_tx)
42
43/**
44 * iop_adma_free_slots - flags descriptor slots for reuse
45 * @slot: Slot to free
46 * Caller must hold &iop_chan->lock while calling this function
47 */
48static void iop_adma_free_slots(struct iop_adma_desc_slot *slot)
49{
50 int stride = slot->slots_per_op;
51
52 while (stride--) {
53 slot->slots_per_op = 0;
54 slot = list_entry(slot->slot_node.next,
55 struct iop_adma_desc_slot,
56 slot_node);
57 }
58}
59
60static dma_cookie_t
61iop_adma_run_tx_complete_actions(struct iop_adma_desc_slot *desc,
62 struct iop_adma_chan *iop_chan, dma_cookie_t cookie)
63{
Dan Williams507fbec2009-08-29 19:12:39 -070064 struct dma_async_tx_descriptor *tx = &desc->async_tx;
65
66 BUG_ON(tx->cookie < 0);
67 if (tx->cookie > 0) {
68 cookie = tx->cookie;
69 tx->cookie = 0;
Dan Williamsc2110922007-01-02 13:52:26 -070070
71 /* call the callback (must not sleep or submit new
72 * operations to this channel)
73 */
Dan Williams507fbec2009-08-29 19:12:39 -070074 if (tx->callback)
75 tx->callback(tx->callback_param);
Dan Williamsc2110922007-01-02 13:52:26 -070076
Dan Williamsd38a8c62013-10-18 19:35:23 +020077 dma_descriptor_unmap(tx);
Bartlomiej Zolnierkiewicz54f8d502013-10-18 19:35:32 +020078 if (desc->group_head)
79 desc->group_head = NULL;
Dan Williamsc2110922007-01-02 13:52:26 -070080 }
81
82 /* run dependent operations */
Dan Williams507fbec2009-08-29 19:12:39 -070083 dma_run_dependencies(tx);
Dan Williamsc2110922007-01-02 13:52:26 -070084
85 return cookie;
86}
87
88static int
89iop_adma_clean_slot(struct iop_adma_desc_slot *desc,
90 struct iop_adma_chan *iop_chan)
91{
92 /* the client is allowed to attach dependent operations
93 * until 'ack' is set
94 */
Dan Williams636bdea2008-04-17 20:17:26 -070095 if (!async_tx_test_ack(&desc->async_tx))
Dan Williamsc2110922007-01-02 13:52:26 -070096 return 0;
97
98 /* leave the last descriptor in the chain
99 * so we can append to it
100 */
101 if (desc->chain_node.next == &iop_chan->chain)
102 return 1;
103
104 dev_dbg(iop_chan->device->common.dev,
105 "\tfree slot: %d slots_per_op: %d\n",
106 desc->idx, desc->slots_per_op);
107
108 list_del(&desc->chain_node);
109 iop_adma_free_slots(desc);
110
111 return 0;
112}
113
114static void __iop_adma_slot_cleanup(struct iop_adma_chan *iop_chan)
115{
116 struct iop_adma_desc_slot *iter, *_iter, *grp_start = NULL;
117 dma_cookie_t cookie = 0;
118 u32 current_desc = iop_chan_get_current_descriptor(iop_chan);
119 int busy = iop_chan_is_busy(iop_chan);
120 int seen_current = 0, slot_cnt = 0, slots_per_op = 0;
121
Harvey Harrison3d9b5252008-03-13 17:45:28 -0700122 dev_dbg(iop_chan->device->common.dev, "%s\n", __func__);
Dan Williamsc2110922007-01-02 13:52:26 -0700123 /* free completed slots from the chain starting with
124 * the oldest descriptor
125 */
126 list_for_each_entry_safe(iter, _iter, &iop_chan->chain,
127 chain_node) {
128 pr_debug("\tcookie: %d slot: %d busy: %d "
129 "this_desc: %#x next_desc: %#x ack: %d\n",
130 iter->async_tx.cookie, iter->idx, busy,
131 iter->async_tx.phys, iop_desc_get_next_desc(iter),
Dan Williams636bdea2008-04-17 20:17:26 -0700132 async_tx_test_ack(&iter->async_tx));
Dan Williamsc2110922007-01-02 13:52:26 -0700133 prefetch(_iter);
134 prefetch(&_iter->async_tx);
135
136 /* do not advance past the current descriptor loaded into the
137 * hardware channel, subsequent descriptors are either in
138 * process or have not been submitted
139 */
140 if (seen_current)
141 break;
142
143 /* stop the search if we reach the current descriptor and the
144 * channel is busy, or if it appears that the current descriptor
145 * needs to be re-read (i.e. has been appended to)
146 */
147 if (iter->async_tx.phys == current_desc) {
148 BUG_ON(seen_current++);
149 if (busy || iop_desc_get_next_desc(iter))
150 break;
151 }
152
153 /* detect the start of a group transaction */
154 if (!slot_cnt && !slots_per_op) {
155 slot_cnt = iter->slot_cnt;
156 slots_per_op = iter->slots_per_op;
157 if (slot_cnt <= slots_per_op) {
158 slot_cnt = 0;
159 slots_per_op = 0;
160 }
161 }
162
163 if (slot_cnt) {
164 pr_debug("\tgroup++\n");
165 if (!grp_start)
166 grp_start = iter;
167 slot_cnt -= slots_per_op;
168 }
169
170 /* all the members of a group are complete */
171 if (slots_per_op != 0 && slot_cnt == 0) {
172 struct iop_adma_desc_slot *grp_iter, *_grp_iter;
173 int end_of_chain = 0;
174 pr_debug("\tgroup end\n");
175
176 /* collect the total results */
177 if (grp_start->xor_check_result) {
178 u32 zero_sum_result = 0;
179 slot_cnt = grp_start->slot_cnt;
180 grp_iter = grp_start;
181
182 list_for_each_entry_from(grp_iter,
183 &iop_chan->chain, chain_node) {
184 zero_sum_result |=
185 iop_desc_get_zero_result(grp_iter);
186 pr_debug("\titer%d result: %d\n",
187 grp_iter->idx, zero_sum_result);
188 slot_cnt -= slots_per_op;
189 if (slot_cnt == 0)
190 break;
191 }
192 pr_debug("\tgrp_start->xor_check_result: %p\n",
193 grp_start->xor_check_result);
194 *grp_start->xor_check_result = zero_sum_result;
195 }
196
197 /* clean up the group */
198 slot_cnt = grp_start->slot_cnt;
199 grp_iter = grp_start;
200 list_for_each_entry_safe_from(grp_iter, _grp_iter,
201 &iop_chan->chain, chain_node) {
202 cookie = iop_adma_run_tx_complete_actions(
203 grp_iter, iop_chan, cookie);
204
205 slot_cnt -= slots_per_op;
206 end_of_chain = iop_adma_clean_slot(grp_iter,
207 iop_chan);
208
209 if (slot_cnt == 0 || end_of_chain)
210 break;
211 }
212
213 /* the group should be complete at this point */
214 BUG_ON(slot_cnt);
215
216 slots_per_op = 0;
217 grp_start = NULL;
218 if (end_of_chain)
219 break;
220 else
221 continue;
222 } else if (slots_per_op) /* wait for group completion */
223 continue;
224
225 /* write back zero sum results (single descriptor case) */
226 if (iter->xor_check_result && iter->async_tx.cookie)
227 *iter->xor_check_result =
228 iop_desc_get_zero_result(iter);
229
230 cookie = iop_adma_run_tx_complete_actions(
231 iter, iop_chan, cookie);
232
233 if (iop_adma_clean_slot(iter, iop_chan))
234 break;
235 }
236
Dan Williamsc2110922007-01-02 13:52:26 -0700237 if (cookie > 0) {
Russell King - ARM Linux4d4e58d2012-03-06 22:34:06 +0000238 iop_chan->common.completed_cookie = cookie;
Dan Williamsc2110922007-01-02 13:52:26 -0700239 pr_debug("\tcompleted cookie %d\n", cookie);
240 }
241}
242
243static void
244iop_adma_slot_cleanup(struct iop_adma_chan *iop_chan)
245{
246 spin_lock_bh(&iop_chan->lock);
247 __iop_adma_slot_cleanup(iop_chan);
248 spin_unlock_bh(&iop_chan->lock);
249}
250
251static void iop_adma_tasklet(unsigned long data)
252{
Dan Williams19242d72008-04-17 20:17:25 -0700253 struct iop_adma_chan *iop_chan = (struct iop_adma_chan *) data;
254
Dan Williams72be12f2009-07-14 13:38:29 -0700255 /* lockdep will flag depedency submissions as potentially
256 * recursive locking, this is not the case as a dependency
257 * submission will never recurse a channels submit routine.
258 * There are checks in async_tx.c to prevent this.
259 */
260 spin_lock_nested(&iop_chan->lock, SINGLE_DEPTH_NESTING);
Dan Williams19242d72008-04-17 20:17:25 -0700261 __iop_adma_slot_cleanup(iop_chan);
262 spin_unlock(&iop_chan->lock);
Dan Williamsc2110922007-01-02 13:52:26 -0700263}
264
265static struct iop_adma_desc_slot *
266iop_adma_alloc_slots(struct iop_adma_chan *iop_chan, int num_slots,
267 int slots_per_op)
268{
269 struct iop_adma_desc_slot *iter, *_iter, *alloc_start = NULL;
Denis Chenge73ef9a2008-02-02 19:30:01 -0700270 LIST_HEAD(chain);
Dan Williamsc2110922007-01-02 13:52:26 -0700271 int slots_found, retry = 0;
272
273 /* start search from the last allocated descrtiptor
274 * if a contiguous allocation can not be found start searching
275 * from the beginning of the list
276 */
277retry:
278 slots_found = 0;
279 if (retry == 0)
280 iter = iop_chan->last_used;
281 else
282 iter = list_entry(&iop_chan->all_slots,
283 struct iop_adma_desc_slot,
284 slot_node);
285
286 list_for_each_entry_safe_continue(
287 iter, _iter, &iop_chan->all_slots, slot_node) {
288 prefetch(_iter);
289 prefetch(&_iter->async_tx);
290 if (iter->slots_per_op) {
291 /* give up after finding the first busy slot
292 * on the second pass through the list
293 */
294 if (retry)
295 break;
296
297 slots_found = 0;
298 continue;
299 }
300
301 /* start the allocation if the slot is correctly aligned */
302 if (!slots_found++) {
303 if (iop_desc_is_aligned(iter, slots_per_op))
304 alloc_start = iter;
305 else {
306 slots_found = 0;
307 continue;
308 }
309 }
310
311 if (slots_found == num_slots) {
312 struct iop_adma_desc_slot *alloc_tail = NULL;
313 struct iop_adma_desc_slot *last_used = NULL;
314 iter = alloc_start;
315 while (num_slots) {
316 int i;
317 dev_dbg(iop_chan->device->common.dev,
318 "allocated slot: %d "
319 "(desc %p phys: %#x) slots_per_op %d\n",
320 iter->idx, iter->hw_desc,
321 iter->async_tx.phys, slots_per_op);
322
323 /* pre-ack all but the last descriptor */
324 if (num_slots != slots_per_op)
Dan Williams636bdea2008-04-17 20:17:26 -0700325 async_tx_ack(&iter->async_tx);
Dan Williamsc2110922007-01-02 13:52:26 -0700326
327 list_add_tail(&iter->chain_node, &chain);
328 alloc_tail = iter;
329 iter->async_tx.cookie = 0;
330 iter->slot_cnt = num_slots;
331 iter->xor_check_result = NULL;
332 for (i = 0; i < slots_per_op; i++) {
333 iter->slots_per_op = slots_per_op - i;
334 last_used = iter;
335 iter = list_entry(iter->slot_node.next,
336 struct iop_adma_desc_slot,
337 slot_node);
338 }
339 num_slots -= slots_per_op;
340 }
341 alloc_tail->group_head = alloc_start;
342 alloc_tail->async_tx.cookie = -EBUSY;
Dan Williams308136d2009-09-08 17:53:02 -0700343 list_splice(&chain, &alloc_tail->tx_list);
Dan Williamsc2110922007-01-02 13:52:26 -0700344 iop_chan->last_used = last_used;
345 iop_desc_clear_next_desc(alloc_start);
346 iop_desc_clear_next_desc(alloc_tail);
347 return alloc_tail;
348 }
349 }
350 if (!retry++)
351 goto retry;
352
Dan Williamsc7141d02008-07-17 17:59:56 -0700353 /* perform direct reclaim if the allocation fails */
354 __iop_adma_slot_cleanup(iop_chan);
Dan Williamsc2110922007-01-02 13:52:26 -0700355
356 return NULL;
357}
358
Dan Williamsc2110922007-01-02 13:52:26 -0700359static void iop_adma_check_threshold(struct iop_adma_chan *iop_chan)
360{
361 dev_dbg(iop_chan->device->common.dev, "pending: %d\n",
362 iop_chan->pending);
363
364 if (iop_chan->pending >= IOP_ADMA_THRESHOLD) {
365 iop_chan->pending = 0;
366 iop_chan_append(iop_chan);
367 }
368}
369
370static dma_cookie_t
371iop_adma_tx_submit(struct dma_async_tx_descriptor *tx)
372{
373 struct iop_adma_desc_slot *sw_desc = tx_to_iop_adma_slot(tx);
374 struct iop_adma_chan *iop_chan = to_iop_adma_chan(tx->chan);
375 struct iop_adma_desc_slot *grp_start, *old_chain_tail;
376 int slot_cnt;
377 int slots_per_op;
378 dma_cookie_t cookie;
Dan Williams137cb552008-11-11 13:12:33 -0700379 dma_addr_t next_dma;
Dan Williamsc2110922007-01-02 13:52:26 -0700380
381 grp_start = sw_desc->group_head;
382 slot_cnt = grp_start->slot_cnt;
383 slots_per_op = grp_start->slots_per_op;
384
385 spin_lock_bh(&iop_chan->lock);
Russell King - ARM Linux884485e2012-03-06 22:34:46 +0000386 cookie = dma_cookie_assign(tx);
Dan Williamsc2110922007-01-02 13:52:26 -0700387
388 old_chain_tail = list_entry(iop_chan->chain.prev,
389 struct iop_adma_desc_slot, chain_node);
Dan Williams308136d2009-09-08 17:53:02 -0700390 list_splice_init(&sw_desc->tx_list,
Dan Williamsc2110922007-01-02 13:52:26 -0700391 &old_chain_tail->chain_node);
392
393 /* fix up the hardware chain */
Dan Williams137cb552008-11-11 13:12:33 -0700394 next_dma = grp_start->async_tx.phys;
395 iop_desc_set_next_desc(old_chain_tail, next_dma);
396 BUG_ON(iop_desc_get_next_desc(old_chain_tail) != next_dma); /* flush */
Dan Williamsc2110922007-01-02 13:52:26 -0700397
Dan Williams137cb552008-11-11 13:12:33 -0700398 /* check for pre-chained descriptors */
Dan Williams65e50382008-11-11 13:12:33 -0700399 iop_paranoia(iop_desc_get_next_desc(sw_desc));
Dan Williamsc2110922007-01-02 13:52:26 -0700400
401 /* increment the pending count by the number of slots
402 * memcpy operations have a 1:1 (slot:operation) relation
403 * other operations are heavier and will pop the threshold
404 * more often.
405 */
406 iop_chan->pending += slot_cnt;
407 iop_adma_check_threshold(iop_chan);
408 spin_unlock_bh(&iop_chan->lock);
409
410 dev_dbg(iop_chan->device->common.dev, "%s cookie: %d slot: %d\n",
Harvey Harrison3d9b5252008-03-13 17:45:28 -0700411 __func__, sw_desc->async_tx.cookie, sw_desc->idx);
Dan Williamsc2110922007-01-02 13:52:26 -0700412
413 return cookie;
414}
415
Dan Williamsc2110922007-01-02 13:52:26 -0700416static void iop_chan_start_null_memcpy(struct iop_adma_chan *iop_chan);
417static void iop_chan_start_null_xor(struct iop_adma_chan *iop_chan);
418
Dan Williams5eb907a2008-07-17 17:59:56 -0700419/**
420 * iop_adma_alloc_chan_resources - returns the number of allocated descriptors
421 * @chan - allocate descriptor resources for this channel
422 * @client - current client requesting the channel be ready for requests
423 *
424 * Note: We keep the slots for 1 operation on iop_chan->chain at all times. To
425 * avoid deadlock, via async_xor, num_descs_in_pool must at a minimum be
426 * greater than 2x the number slots needed to satisfy a device->max_xor
427 * request.
428 * */
Dan Williamsaa1e6f12009-01-06 11:38:17 -0700429static int iop_adma_alloc_chan_resources(struct dma_chan *chan)
Dan Williamsc2110922007-01-02 13:52:26 -0700430{
431 char *hw_desc;
432 int idx;
433 struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
434 struct iop_adma_desc_slot *slot = NULL;
435 int init = iop_chan->slots_allocated ? 0 : 1;
436 struct iop_adma_platform_data *plat_data =
Jingoo Hand4adcc02013-07-30 17:09:11 +0900437 dev_get_platdata(&iop_chan->device->pdev->dev);
Dan Williamsc2110922007-01-02 13:52:26 -0700438 int num_descs_in_pool = plat_data->pool_size/IOP_ADMA_SLOT_SIZE;
439
440 /* Allocate descriptor slots */
441 do {
442 idx = iop_chan->slots_allocated;
443 if (idx == num_descs_in_pool)
444 break;
445
446 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
447 if (!slot) {
448 printk(KERN_INFO "IOP ADMA Channel only initialized"
449 " %d descriptor slots", idx);
450 break;
451 }
452 hw_desc = (char *) iop_chan->device->dma_desc_pool_virt;
453 slot->hw_desc = (void *) &hw_desc[idx * IOP_ADMA_SLOT_SIZE];
454
455 dma_async_tx_descriptor_init(&slot->async_tx, chan);
456 slot->async_tx.tx_submit = iop_adma_tx_submit;
Dan Williams308136d2009-09-08 17:53:02 -0700457 INIT_LIST_HEAD(&slot->tx_list);
Dan Williamsc2110922007-01-02 13:52:26 -0700458 INIT_LIST_HEAD(&slot->chain_node);
459 INIT_LIST_HEAD(&slot->slot_node);
Dan Williamsc2110922007-01-02 13:52:26 -0700460 hw_desc = (char *) iop_chan->device->dma_desc_pool;
461 slot->async_tx.phys =
462 (dma_addr_t) &hw_desc[idx * IOP_ADMA_SLOT_SIZE];
463 slot->idx = idx;
464
465 spin_lock_bh(&iop_chan->lock);
466 iop_chan->slots_allocated++;
467 list_add_tail(&slot->slot_node, &iop_chan->all_slots);
468 spin_unlock_bh(&iop_chan->lock);
469 } while (iop_chan->slots_allocated < num_descs_in_pool);
470
471 if (idx && !iop_chan->last_used)
472 iop_chan->last_used = list_entry(iop_chan->all_slots.next,
473 struct iop_adma_desc_slot,
474 slot_node);
475
476 dev_dbg(iop_chan->device->common.dev,
477 "allocated %d descriptor slots last_used: %p\n",
478 iop_chan->slots_allocated, iop_chan->last_used);
479
480 /* initialize the channel and the chain with a null operation */
481 if (init) {
482 if (dma_has_cap(DMA_MEMCPY,
483 iop_chan->device->common.cap_mask))
484 iop_chan_start_null_memcpy(iop_chan);
485 else if (dma_has_cap(DMA_XOR,
486 iop_chan->device->common.cap_mask))
487 iop_chan_start_null_xor(iop_chan);
488 else
489 BUG();
490 }
491
492 return (idx > 0) ? idx : -ENOMEM;
493}
494
495static struct dma_async_tx_descriptor *
Dan Williams636bdea2008-04-17 20:17:26 -0700496iop_adma_prep_dma_interrupt(struct dma_chan *chan, unsigned long flags)
Dan Williamsc2110922007-01-02 13:52:26 -0700497{
498 struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
499 struct iop_adma_desc_slot *sw_desc, *grp_start;
500 int slot_cnt, slots_per_op;
501
Harvey Harrison3d9b5252008-03-13 17:45:28 -0700502 dev_dbg(iop_chan->device->common.dev, "%s\n", __func__);
Dan Williamsc2110922007-01-02 13:52:26 -0700503
504 spin_lock_bh(&iop_chan->lock);
505 slot_cnt = iop_chan_interrupt_slot_count(&slots_per_op, iop_chan);
506 sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
507 if (sw_desc) {
508 grp_start = sw_desc->group_head;
509 iop_desc_init_interrupt(grp_start, iop_chan);
Dan Williams636bdea2008-04-17 20:17:26 -0700510 sw_desc->async_tx.flags = flags;
Dan Williamsc2110922007-01-02 13:52:26 -0700511 }
512 spin_unlock_bh(&iop_chan->lock);
513
514 return sw_desc ? &sw_desc->async_tx : NULL;
515}
516
Dan Williamsc2110922007-01-02 13:52:26 -0700517static struct dma_async_tx_descriptor *
Dan Williams00367312008-02-02 19:49:57 -0700518iop_adma_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dma_dest,
Dan Williamsd4c56f92008-02-02 19:49:58 -0700519 dma_addr_t dma_src, size_t len, unsigned long flags)
Dan Williamsc2110922007-01-02 13:52:26 -0700520{
521 struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
522 struct iop_adma_desc_slot *sw_desc, *grp_start;
523 int slot_cnt, slots_per_op;
524
525 if (unlikely(!len))
526 return NULL;
Coly Lie2ec7712011-03-27 01:26:52 +0800527 BUG_ON(len > IOP_ADMA_MAX_BYTE_COUNT);
Dan Williamsc2110922007-01-02 13:52:26 -0700528
529 dev_dbg(iop_chan->device->common.dev, "%s len: %u\n",
Harvey Harrison3d9b5252008-03-13 17:45:28 -0700530 __func__, len);
Dan Williamsc2110922007-01-02 13:52:26 -0700531
532 spin_lock_bh(&iop_chan->lock);
533 slot_cnt = iop_chan_memcpy_slot_count(len, &slots_per_op);
534 sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
535 if (sw_desc) {
536 grp_start = sw_desc->group_head;
Dan Williamsd4c56f92008-02-02 19:49:58 -0700537 iop_desc_init_memcpy(grp_start, flags);
Dan Williamsc2110922007-01-02 13:52:26 -0700538 iop_desc_set_byte_count(grp_start, iop_chan, len);
Dan Williams00367312008-02-02 19:49:57 -0700539 iop_desc_set_dest_addr(grp_start, iop_chan, dma_dest);
540 iop_desc_set_memcpy_src_addr(grp_start, dma_src);
Dan Williams636bdea2008-04-17 20:17:26 -0700541 sw_desc->async_tx.flags = flags;
Dan Williamsc2110922007-01-02 13:52:26 -0700542 }
543 spin_unlock_bh(&iop_chan->lock);
544
545 return sw_desc ? &sw_desc->async_tx : NULL;
546}
547
548static struct dma_async_tx_descriptor *
Dan Williams00367312008-02-02 19:49:57 -0700549iop_adma_prep_dma_xor(struct dma_chan *chan, dma_addr_t dma_dest,
550 dma_addr_t *dma_src, unsigned int src_cnt, size_t len,
Dan Williamsd4c56f92008-02-02 19:49:58 -0700551 unsigned long flags)
Dan Williamsc2110922007-01-02 13:52:26 -0700552{
553 struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
554 struct iop_adma_desc_slot *sw_desc, *grp_start;
555 int slot_cnt, slots_per_op;
556
557 if (unlikely(!len))
558 return NULL;
Coly Lie2ec7712011-03-27 01:26:52 +0800559 BUG_ON(len > IOP_ADMA_XOR_MAX_BYTE_COUNT);
Dan Williamsc2110922007-01-02 13:52:26 -0700560
561 dev_dbg(iop_chan->device->common.dev,
Dan Williamsd4c56f92008-02-02 19:49:58 -0700562 "%s src_cnt: %d len: %u flags: %lx\n",
Harvey Harrison3d9b5252008-03-13 17:45:28 -0700563 __func__, src_cnt, len, flags);
Dan Williamsc2110922007-01-02 13:52:26 -0700564
565 spin_lock_bh(&iop_chan->lock);
566 slot_cnt = iop_chan_xor_slot_count(len, src_cnt, &slots_per_op);
567 sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
568 if (sw_desc) {
569 grp_start = sw_desc->group_head;
Dan Williamsd4c56f92008-02-02 19:49:58 -0700570 iop_desc_init_xor(grp_start, src_cnt, flags);
Dan Williamsc2110922007-01-02 13:52:26 -0700571 iop_desc_set_byte_count(grp_start, iop_chan, len);
Dan Williams00367312008-02-02 19:49:57 -0700572 iop_desc_set_dest_addr(grp_start, iop_chan, dma_dest);
Dan Williams636bdea2008-04-17 20:17:26 -0700573 sw_desc->async_tx.flags = flags;
Dan Williams00367312008-02-02 19:49:57 -0700574 while (src_cnt--)
575 iop_desc_set_xor_src_addr(grp_start, src_cnt,
576 dma_src[src_cnt]);
Dan Williamsc2110922007-01-02 13:52:26 -0700577 }
578 spin_unlock_bh(&iop_chan->lock);
579
580 return sw_desc ? &sw_desc->async_tx : NULL;
581}
582
Dan Williamsc2110922007-01-02 13:52:26 -0700583static struct dma_async_tx_descriptor *
Dan Williams099f53c2009-04-08 14:28:37 -0700584iop_adma_prep_dma_xor_val(struct dma_chan *chan, dma_addr_t *dma_src,
585 unsigned int src_cnt, size_t len, u32 *result,
586 unsigned long flags)
Dan Williamsc2110922007-01-02 13:52:26 -0700587{
588 struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
589 struct iop_adma_desc_slot *sw_desc, *grp_start;
590 int slot_cnt, slots_per_op;
591
592 if (unlikely(!len))
593 return NULL;
594
595 dev_dbg(iop_chan->device->common.dev, "%s src_cnt: %d len: %u\n",
Harvey Harrison3d9b5252008-03-13 17:45:28 -0700596 __func__, src_cnt, len);
Dan Williamsc2110922007-01-02 13:52:26 -0700597
598 spin_lock_bh(&iop_chan->lock);
599 slot_cnt = iop_chan_zero_sum_slot_count(len, src_cnt, &slots_per_op);
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;
Dan Williamsd4c56f92008-02-02 19:49:58 -0700603 iop_desc_init_zero_sum(grp_start, src_cnt, flags);
Dan Williamsc2110922007-01-02 13:52:26 -0700604 iop_desc_set_zero_sum_byte_count(grp_start, len);
605 grp_start->xor_check_result = result;
606 pr_debug("\t%s: grp_start->xor_check_result: %p\n",
Harvey Harrison3d9b5252008-03-13 17:45:28 -0700607 __func__, grp_start->xor_check_result);
Dan Williams636bdea2008-04-17 20:17:26 -0700608 sw_desc->async_tx.flags = flags;
Dan Williams00367312008-02-02 19:49:57 -0700609 while (src_cnt--)
610 iop_desc_set_zero_sum_src_addr(grp_start, src_cnt,
611 dma_src[src_cnt]);
Dan Williamsc2110922007-01-02 13:52:26 -0700612 }
613 spin_unlock_bh(&iop_chan->lock);
614
615 return sw_desc ? &sw_desc->async_tx : NULL;
616}
617
Dan Williams7bf649a2009-08-28 14:32:04 -0700618static struct dma_async_tx_descriptor *
619iop_adma_prep_dma_pq(struct dma_chan *chan, dma_addr_t *dst, dma_addr_t *src,
620 unsigned int src_cnt, const unsigned char *scf, size_t len,
621 unsigned long flags)
622{
623 struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
624 struct iop_adma_desc_slot *sw_desc, *g;
625 int slot_cnt, slots_per_op;
626 int continue_srcs;
627
628 if (unlikely(!len))
629 return NULL;
630 BUG_ON(len > IOP_ADMA_XOR_MAX_BYTE_COUNT);
631
632 dev_dbg(iop_chan->device->common.dev,
633 "%s src_cnt: %d len: %u flags: %lx\n",
634 __func__, src_cnt, len, flags);
635
636 if (dmaf_p_disabled_continue(flags))
637 continue_srcs = 1+src_cnt;
638 else if (dmaf_continue(flags))
639 continue_srcs = 3+src_cnt;
640 else
641 continue_srcs = 0+src_cnt;
642
643 spin_lock_bh(&iop_chan->lock);
644 slot_cnt = iop_chan_pq_slot_count(len, continue_srcs, &slots_per_op);
645 sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
646 if (sw_desc) {
647 int i;
648
649 g = sw_desc->group_head;
650 iop_desc_set_byte_count(g, iop_chan, len);
651
652 /* even if P is disabled its destination address (bits
653 * [3:0]) must match Q. It is ok if P points to an
654 * invalid address, it won't be written.
655 */
656 if (flags & DMA_PREP_PQ_DISABLE_P)
657 dst[0] = dst[1] & 0x7;
658
659 iop_desc_set_pq_addr(g, dst);
Dan Williams7bf649a2009-08-28 14:32:04 -0700660 sw_desc->async_tx.flags = flags;
661 for (i = 0; i < src_cnt; i++)
662 iop_desc_set_pq_src_addr(g, i, src[i], scf[i]);
663
664 /* if we are continuing a previous operation factor in
665 * the old p and q values, see the comment for dma_maxpq
666 * in include/linux/dmaengine.h
667 */
668 if (dmaf_p_disabled_continue(flags))
669 iop_desc_set_pq_src_addr(g, i++, dst[1], 1);
670 else if (dmaf_continue(flags)) {
671 iop_desc_set_pq_src_addr(g, i++, dst[0], 0);
672 iop_desc_set_pq_src_addr(g, i++, dst[1], 1);
673 iop_desc_set_pq_src_addr(g, i++, dst[1], 0);
674 }
675 iop_desc_init_pq(g, i, flags);
676 }
677 spin_unlock_bh(&iop_chan->lock);
678
679 return sw_desc ? &sw_desc->async_tx : NULL;
680}
681
682static struct dma_async_tx_descriptor *
683iop_adma_prep_dma_pq_val(struct dma_chan *chan, dma_addr_t *pq, dma_addr_t *src,
684 unsigned int src_cnt, const unsigned char *scf,
685 size_t len, enum sum_check_flags *pqres,
686 unsigned long flags)
687{
688 struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
689 struct iop_adma_desc_slot *sw_desc, *g;
690 int slot_cnt, slots_per_op;
691
692 if (unlikely(!len))
693 return NULL;
694 BUG_ON(len > IOP_ADMA_XOR_MAX_BYTE_COUNT);
695
696 dev_dbg(iop_chan->device->common.dev, "%s src_cnt: %d len: %u\n",
697 __func__, src_cnt, len);
698
699 spin_lock_bh(&iop_chan->lock);
700 slot_cnt = iop_chan_pq_zero_sum_slot_count(len, src_cnt + 2, &slots_per_op);
701 sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
702 if (sw_desc) {
703 /* for validate operations p and q are tagged onto the
704 * end of the source list
705 */
706 int pq_idx = src_cnt;
707
708 g = sw_desc->group_head;
709 iop_desc_init_pq_zero_sum(g, src_cnt+2, flags);
710 iop_desc_set_pq_zero_sum_byte_count(g, len);
711 g->pq_check_result = pqres;
712 pr_debug("\t%s: g->pq_check_result: %p\n",
713 __func__, g->pq_check_result);
Dan Williams7bf649a2009-08-28 14:32:04 -0700714 sw_desc->async_tx.flags = flags;
715 while (src_cnt--)
716 iop_desc_set_pq_zero_sum_src_addr(g, src_cnt,
717 src[src_cnt],
718 scf[src_cnt]);
719 iop_desc_set_pq_zero_sum_addr(g, pq_idx, src);
720 }
721 spin_unlock_bh(&iop_chan->lock);
722
723 return sw_desc ? &sw_desc->async_tx : NULL;
724}
725
Dan Williamsc2110922007-01-02 13:52:26 -0700726static void iop_adma_free_chan_resources(struct dma_chan *chan)
727{
728 struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
729 struct iop_adma_desc_slot *iter, *_iter;
730 int in_use_descs = 0;
731
732 iop_adma_slot_cleanup(iop_chan);
733
734 spin_lock_bh(&iop_chan->lock);
735 list_for_each_entry_safe(iter, _iter, &iop_chan->chain,
736 chain_node) {
737 in_use_descs++;
738 list_del(&iter->chain_node);
739 }
740 list_for_each_entry_safe_reverse(
741 iter, _iter, &iop_chan->all_slots, slot_node) {
742 list_del(&iter->slot_node);
743 kfree(iter);
744 iop_chan->slots_allocated--;
745 }
746 iop_chan->last_used = NULL;
747
748 dev_dbg(iop_chan->device->common.dev, "%s slots_allocated %d\n",
Harvey Harrison3d9b5252008-03-13 17:45:28 -0700749 __func__, iop_chan->slots_allocated);
Dan Williamsc2110922007-01-02 13:52:26 -0700750 spin_unlock_bh(&iop_chan->lock);
751
752 /* one is ok since we left it on there on purpose */
753 if (in_use_descs > 1)
754 printk(KERN_ERR "IOP: Freeing %d in use descriptors!\n",
755 in_use_descs - 1);
756}
757
758/**
Linus Walleij07934482010-03-26 16:50:49 -0700759 * iop_adma_status - poll the status of an ADMA transaction
Dan Williamsc2110922007-01-02 13:52:26 -0700760 * @chan: ADMA channel handle
761 * @cookie: ADMA transaction identifier
Linus Walleij07934482010-03-26 16:50:49 -0700762 * @txstate: a holder for the current state of the channel or NULL
Dan Williamsc2110922007-01-02 13:52:26 -0700763 */
Linus Walleij07934482010-03-26 16:50:49 -0700764static enum dma_status iop_adma_status(struct dma_chan *chan,
Dan Williamsc2110922007-01-02 13:52:26 -0700765 dma_cookie_t cookie,
Linus Walleij07934482010-03-26 16:50:49 -0700766 struct dma_tx_state *txstate)
Dan Williamsc2110922007-01-02 13:52:26 -0700767{
768 struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
Vinod Koul949ff5b2012-03-13 11:58:12 +0530769 int ret;
Dan Williamsc2110922007-01-02 13:52:26 -0700770
Russell King - ARM Linux96a2af42012-03-06 22:35:27 +0000771 ret = dma_cookie_status(chan, cookie, txstate);
Vinod Koul9f5715022013-10-16 20:49:42 +0530772 if (ret == DMA_COMPLETE)
Dan Williamsc2110922007-01-02 13:52:26 -0700773 return ret;
774
775 iop_adma_slot_cleanup(iop_chan);
776
Russell King - ARM Linux96a2af42012-03-06 22:35:27 +0000777 return dma_cookie_status(chan, cookie, txstate);
Dan Williamsc2110922007-01-02 13:52:26 -0700778}
779
780static irqreturn_t iop_adma_eot_handler(int irq, void *data)
781{
782 struct iop_adma_chan *chan = data;
783
Harvey Harrison3d9b5252008-03-13 17:45:28 -0700784 dev_dbg(chan->device->common.dev, "%s\n", __func__);
Dan Williamsc2110922007-01-02 13:52:26 -0700785
786 tasklet_schedule(&chan->irq_tasklet);
787
788 iop_adma_device_clear_eot_status(chan);
789
790 return IRQ_HANDLED;
791}
792
793static irqreturn_t iop_adma_eoc_handler(int irq, void *data)
794{
795 struct iop_adma_chan *chan = data;
796
Harvey Harrison3d9b5252008-03-13 17:45:28 -0700797 dev_dbg(chan->device->common.dev, "%s\n", __func__);
Dan Williamsc2110922007-01-02 13:52:26 -0700798
799 tasklet_schedule(&chan->irq_tasklet);
800
801 iop_adma_device_clear_eoc_status(chan);
802
803 return IRQ_HANDLED;
804}
805
806static irqreturn_t iop_adma_err_handler(int irq, void *data)
807{
808 struct iop_adma_chan *chan = data;
809 unsigned long status = iop_chan_get_status(chan);
810
Joe Perches1ba151c2012-10-28 01:05:44 -0700811 dev_err(chan->device->common.dev,
Dan Williamsc2110922007-01-02 13:52:26 -0700812 "error ( %s%s%s%s%s%s%s)\n",
813 iop_is_err_int_parity(status, chan) ? "int_parity " : "",
814 iop_is_err_mcu_abort(status, chan) ? "mcu_abort " : "",
815 iop_is_err_int_tabort(status, chan) ? "int_tabort " : "",
816 iop_is_err_int_mabort(status, chan) ? "int_mabort " : "",
817 iop_is_err_pci_tabort(status, chan) ? "pci_tabort " : "",
818 iop_is_err_pci_mabort(status, chan) ? "pci_mabort " : "",
819 iop_is_err_split_tx(status, chan) ? "split_tx " : "");
820
821 iop_adma_device_clear_err_status(chan);
822
823 BUG();
824
825 return IRQ_HANDLED;
826}
827
828static void iop_adma_issue_pending(struct dma_chan *chan)
829{
830 struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
831
832 if (iop_chan->pending) {
833 iop_chan->pending = 0;
834 iop_chan_append(iop_chan);
835 }
836}
837
838/*
839 * Perform a transaction to verify the HW works.
840 */
841#define IOP_ADMA_TEST_SIZE 2000
842
Bill Pemberton463a1f82012-11-19 13:22:55 -0500843static int iop_adma_memcpy_self_test(struct iop_adma_device *device)
Dan Williamsc2110922007-01-02 13:52:26 -0700844{
845 int i;
846 void *src, *dest;
847 dma_addr_t src_dma, dest_dma;
848 struct dma_chan *dma_chan;
849 dma_cookie_t cookie;
850 struct dma_async_tx_descriptor *tx;
851 int err = 0;
852 struct iop_adma_chan *iop_chan;
853
Harvey Harrison3d9b5252008-03-13 17:45:28 -0700854 dev_dbg(device->common.dev, "%s\n", __func__);
Dan Williamsc2110922007-01-02 13:52:26 -0700855
Christophe Jailleteccf2142008-05-20 16:33:06 -0700856 src = kmalloc(IOP_ADMA_TEST_SIZE, GFP_KERNEL);
Dan Williamsc2110922007-01-02 13:52:26 -0700857 if (!src)
858 return -ENOMEM;
Christophe Jailleteccf2142008-05-20 16:33:06 -0700859 dest = kzalloc(IOP_ADMA_TEST_SIZE, GFP_KERNEL);
Dan Williamsc2110922007-01-02 13:52:26 -0700860 if (!dest) {
861 kfree(src);
862 return -ENOMEM;
863 }
864
865 /* Fill in src buffer */
866 for (i = 0; i < IOP_ADMA_TEST_SIZE; i++)
867 ((u8 *) src)[i] = (u8)i;
868
Dan Williamsc2110922007-01-02 13:52:26 -0700869 /* Start copy, using first DMA channel */
870 dma_chan = container_of(device->common.channels.next,
871 struct dma_chan,
872 device_node);
Dan Williamsaa1e6f12009-01-06 11:38:17 -0700873 if (iop_adma_alloc_chan_resources(dma_chan) < 1) {
Dan Williamsc2110922007-01-02 13:52:26 -0700874 err = -ENODEV;
875 goto out;
876 }
877
Dan Williamsc2110922007-01-02 13:52:26 -0700878 dest_dma = dma_map_single(dma_chan->device->dev, dest,
879 IOP_ADMA_TEST_SIZE, DMA_FROM_DEVICE);
Dan Williamsc2110922007-01-02 13:52:26 -0700880 src_dma = dma_map_single(dma_chan->device->dev, src,
881 IOP_ADMA_TEST_SIZE, DMA_TO_DEVICE);
Dan Williams00367312008-02-02 19:49:57 -0700882 tx = iop_adma_prep_dma_memcpy(dma_chan, dest_dma, src_dma,
Dan Williams636bdea2008-04-17 20:17:26 -0700883 IOP_ADMA_TEST_SIZE,
884 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
Dan Williamsc2110922007-01-02 13:52:26 -0700885
886 cookie = iop_adma_tx_submit(tx);
887 iop_adma_issue_pending(dma_chan);
Dan Williamsc2110922007-01-02 13:52:26 -0700888 msleep(1);
889
Linus Walleij07934482010-03-26 16:50:49 -0700890 if (iop_adma_status(dma_chan, cookie, NULL) !=
Vinod Koul9f5715022013-10-16 20:49:42 +0530891 DMA_COMPLETE) {
Joe Perches1ba151c2012-10-28 01:05:44 -0700892 dev_err(dma_chan->device->dev,
Dan Williamsc2110922007-01-02 13:52:26 -0700893 "Self-test copy timed out, disabling\n");
894 err = -ENODEV;
895 goto free_resources;
896 }
897
898 iop_chan = to_iop_adma_chan(dma_chan);
899 dma_sync_single_for_cpu(&iop_chan->device->pdev->dev, dest_dma,
900 IOP_ADMA_TEST_SIZE, DMA_FROM_DEVICE);
901 if (memcmp(src, dest, IOP_ADMA_TEST_SIZE)) {
Joe Perches1ba151c2012-10-28 01:05:44 -0700902 dev_err(dma_chan->device->dev,
Dan Williamsc2110922007-01-02 13:52:26 -0700903 "Self-test copy failed compare, disabling\n");
904 err = -ENODEV;
905 goto free_resources;
906 }
907
908free_resources:
909 iop_adma_free_chan_resources(dma_chan);
910out:
911 kfree(src);
912 kfree(dest);
913 return err;
914}
915
916#define IOP_ADMA_NUM_SRC_TEST 4 /* must be <= 15 */
Bill Pemberton463a1f82012-11-19 13:22:55 -0500917static int
Dan Williams099f53c2009-04-08 14:28:37 -0700918iop_adma_xor_val_self_test(struct iop_adma_device *device)
Dan Williamsc2110922007-01-02 13:52:26 -0700919{
920 int i, src_idx;
921 struct page *dest;
922 struct page *xor_srcs[IOP_ADMA_NUM_SRC_TEST];
923 struct page *zero_sum_srcs[IOP_ADMA_NUM_SRC_TEST + 1];
Dan Williams00367312008-02-02 19:49:57 -0700924 dma_addr_t dma_srcs[IOP_ADMA_NUM_SRC_TEST + 1];
Olof Johanssonf9f0a7d2013-07-08 15:59:35 -0700925 dma_addr_t dest_dma;
Dan Williamsc2110922007-01-02 13:52:26 -0700926 struct dma_async_tx_descriptor *tx;
927 struct dma_chan *dma_chan;
928 dma_cookie_t cookie;
929 u8 cmp_byte = 0;
930 u32 cmp_word;
931 u32 zero_sum_result;
932 int err = 0;
933 struct iop_adma_chan *iop_chan;
934
Harvey Harrison3d9b5252008-03-13 17:45:28 -0700935 dev_dbg(device->common.dev, "%s\n", __func__);
Dan Williamsc2110922007-01-02 13:52:26 -0700936
937 for (src_idx = 0; src_idx < IOP_ADMA_NUM_SRC_TEST; src_idx++) {
938 xor_srcs[src_idx] = alloc_page(GFP_KERNEL);
Roel Kluina09b09a2009-02-25 13:56:21 +0100939 if (!xor_srcs[src_idx]) {
940 while (src_idx--)
Dan Williamsc2110922007-01-02 13:52:26 -0700941 __free_page(xor_srcs[src_idx]);
Roel Kluina09b09a2009-02-25 13:56:21 +0100942 return -ENOMEM;
943 }
Dan Williamsc2110922007-01-02 13:52:26 -0700944 }
945
946 dest = alloc_page(GFP_KERNEL);
Roel Kluina09b09a2009-02-25 13:56:21 +0100947 if (!dest) {
948 while (src_idx--)
Dan Williamsc2110922007-01-02 13:52:26 -0700949 __free_page(xor_srcs[src_idx]);
Roel Kluina09b09a2009-02-25 13:56:21 +0100950 return -ENOMEM;
951 }
Dan Williamsc2110922007-01-02 13:52:26 -0700952
953 /* Fill in src buffers */
954 for (src_idx = 0; src_idx < IOP_ADMA_NUM_SRC_TEST; src_idx++) {
955 u8 *ptr = page_address(xor_srcs[src_idx]);
956 for (i = 0; i < PAGE_SIZE; i++)
957 ptr[i] = (1 << src_idx);
958 }
959
960 for (src_idx = 0; src_idx < IOP_ADMA_NUM_SRC_TEST; src_idx++)
961 cmp_byte ^= (u8) (1 << src_idx);
962
963 cmp_word = (cmp_byte << 24) | (cmp_byte << 16) |
964 (cmp_byte << 8) | cmp_byte;
965
966 memset(page_address(dest), 0, PAGE_SIZE);
967
968 dma_chan = container_of(device->common.channels.next,
969 struct dma_chan,
970 device_node);
Dan Williamsaa1e6f12009-01-06 11:38:17 -0700971 if (iop_adma_alloc_chan_resources(dma_chan) < 1) {
Dan Williamsc2110922007-01-02 13:52:26 -0700972 err = -ENODEV;
973 goto out;
974 }
975
976 /* test xor */
Dan Williamsc2110922007-01-02 13:52:26 -0700977 dest_dma = dma_map_page(dma_chan->device->dev, dest, 0,
978 PAGE_SIZE, DMA_FROM_DEVICE);
Dan Williams00367312008-02-02 19:49:57 -0700979 for (i = 0; i < IOP_ADMA_NUM_SRC_TEST; i++)
980 dma_srcs[i] = dma_map_page(dma_chan->device->dev, xor_srcs[i],
981 0, PAGE_SIZE, DMA_TO_DEVICE);
982 tx = iop_adma_prep_dma_xor(dma_chan, dest_dma, dma_srcs,
Dan Williams636bdea2008-04-17 20:17:26 -0700983 IOP_ADMA_NUM_SRC_TEST, PAGE_SIZE,
984 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
Dan Williamsc2110922007-01-02 13:52:26 -0700985
986 cookie = iop_adma_tx_submit(tx);
987 iop_adma_issue_pending(dma_chan);
Dan Williamsc2110922007-01-02 13:52:26 -0700988 msleep(8);
989
Linus Walleij07934482010-03-26 16:50:49 -0700990 if (iop_adma_status(dma_chan, cookie, NULL) !=
Vinod Koul9f5715022013-10-16 20:49:42 +0530991 DMA_COMPLETE) {
Joe Perches1ba151c2012-10-28 01:05:44 -0700992 dev_err(dma_chan->device->dev,
Dan Williamsc2110922007-01-02 13:52:26 -0700993 "Self-test xor timed out, disabling\n");
994 err = -ENODEV;
995 goto free_resources;
996 }
997
998 iop_chan = to_iop_adma_chan(dma_chan);
999 dma_sync_single_for_cpu(&iop_chan->device->pdev->dev, dest_dma,
1000 PAGE_SIZE, DMA_FROM_DEVICE);
1001 for (i = 0; i < (PAGE_SIZE / sizeof(u32)); i++) {
1002 u32 *ptr = page_address(dest);
1003 if (ptr[i] != cmp_word) {
Joe Perches1ba151c2012-10-28 01:05:44 -07001004 dev_err(dma_chan->device->dev,
Dan Williamsc2110922007-01-02 13:52:26 -07001005 "Self-test xor failed compare, disabling\n");
1006 err = -ENODEV;
1007 goto free_resources;
1008 }
1009 }
1010 dma_sync_single_for_device(&iop_chan->device->pdev->dev, dest_dma,
1011 PAGE_SIZE, DMA_TO_DEVICE);
1012
1013 /* skip zero sum if the capability is not present */
Dan Williams099f53c2009-04-08 14:28:37 -07001014 if (!dma_has_cap(DMA_XOR_VAL, dma_chan->device->cap_mask))
Dan Williamsc2110922007-01-02 13:52:26 -07001015 goto free_resources;
1016
1017 /* zero sum the sources with the destintation page */
1018 for (i = 0; i < IOP_ADMA_NUM_SRC_TEST; i++)
1019 zero_sum_srcs[i] = xor_srcs[i];
1020 zero_sum_srcs[i] = dest;
1021
1022 zero_sum_result = 1;
1023
Dan Williams00367312008-02-02 19:49:57 -07001024 for (i = 0; i < IOP_ADMA_NUM_SRC_TEST + 1; i++)
1025 dma_srcs[i] = dma_map_page(dma_chan->device->dev,
1026 zero_sum_srcs[i], 0, PAGE_SIZE,
1027 DMA_TO_DEVICE);
Dan Williams099f53c2009-04-08 14:28:37 -07001028 tx = iop_adma_prep_dma_xor_val(dma_chan, dma_srcs,
1029 IOP_ADMA_NUM_SRC_TEST + 1, PAGE_SIZE,
1030 &zero_sum_result,
1031 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
Dan Williamsc2110922007-01-02 13:52:26 -07001032
1033 cookie = iop_adma_tx_submit(tx);
1034 iop_adma_issue_pending(dma_chan);
Dan Williamsc2110922007-01-02 13:52:26 -07001035 msleep(8);
1036
Vinod Koul9f5715022013-10-16 20:49:42 +05301037 if (iop_adma_status(dma_chan, cookie, NULL) != DMA_COMPLETE) {
Joe Perches1ba151c2012-10-28 01:05:44 -07001038 dev_err(dma_chan->device->dev,
Dan Williamsc2110922007-01-02 13:52:26 -07001039 "Self-test zero sum timed out, disabling\n");
1040 err = -ENODEV;
1041 goto free_resources;
1042 }
1043
1044 if (zero_sum_result != 0) {
Joe Perches1ba151c2012-10-28 01:05:44 -07001045 dev_err(dma_chan->device->dev,
Dan Williamsc2110922007-01-02 13:52:26 -07001046 "Self-test zero sum failed compare, disabling\n");
1047 err = -ENODEV;
1048 goto free_resources;
1049 }
1050
Dan Williamsc2110922007-01-02 13:52:26 -07001051 /* test for non-zero parity sum */
1052 zero_sum_result = 0;
Dan Williams00367312008-02-02 19:49:57 -07001053 for (i = 0; i < IOP_ADMA_NUM_SRC_TEST + 1; i++)
1054 dma_srcs[i] = dma_map_page(dma_chan->device->dev,
1055 zero_sum_srcs[i], 0, PAGE_SIZE,
1056 DMA_TO_DEVICE);
Dan Williams099f53c2009-04-08 14:28:37 -07001057 tx = iop_adma_prep_dma_xor_val(dma_chan, dma_srcs,
1058 IOP_ADMA_NUM_SRC_TEST + 1, PAGE_SIZE,
1059 &zero_sum_result,
1060 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
Dan Williamsc2110922007-01-02 13:52:26 -07001061
1062 cookie = iop_adma_tx_submit(tx);
1063 iop_adma_issue_pending(dma_chan);
Dan Williamsc2110922007-01-02 13:52:26 -07001064 msleep(8);
1065
Vinod Koul9f5715022013-10-16 20:49:42 +05301066 if (iop_adma_status(dma_chan, cookie, NULL) != DMA_COMPLETE) {
Joe Perches1ba151c2012-10-28 01:05:44 -07001067 dev_err(dma_chan->device->dev,
Dan Williamsc2110922007-01-02 13:52:26 -07001068 "Self-test non-zero sum timed out, disabling\n");
1069 err = -ENODEV;
1070 goto free_resources;
1071 }
1072
1073 if (zero_sum_result != 1) {
Joe Perches1ba151c2012-10-28 01:05:44 -07001074 dev_err(dma_chan->device->dev,
Dan Williamsc2110922007-01-02 13:52:26 -07001075 "Self-test non-zero sum failed compare, disabling\n");
1076 err = -ENODEV;
1077 goto free_resources;
1078 }
1079
1080free_resources:
1081 iop_adma_free_chan_resources(dma_chan);
1082out:
1083 src_idx = IOP_ADMA_NUM_SRC_TEST;
1084 while (src_idx--)
1085 __free_page(xor_srcs[src_idx]);
1086 __free_page(dest);
1087 return err;
1088}
1089
Wei Yongquan0261f742010-12-29 20:30:55 +08001090#ifdef CONFIG_RAID6_PQ
Bill Pemberton463a1f82012-11-19 13:22:55 -05001091static int
Dan Williamsf6dbf652009-08-29 19:12:40 -07001092iop_adma_pq_zero_sum_self_test(struct iop_adma_device *device)
1093{
1094 /* combined sources, software pq results, and extra hw pq results */
1095 struct page *pq[IOP_ADMA_NUM_SRC_TEST+2+2];
1096 /* ptr to the extra hw pq buffers defined above */
1097 struct page **pq_hw = &pq[IOP_ADMA_NUM_SRC_TEST+2];
1098 /* address conversion buffers (dma_map / page_address) */
1099 void *pq_sw[IOP_ADMA_NUM_SRC_TEST+2];
Don Morris3d9ea9e2012-03-15 11:07:30 -07001100 dma_addr_t pq_src[IOP_ADMA_NUM_SRC_TEST+2];
1101 dma_addr_t *pq_dest = &pq_src[IOP_ADMA_NUM_SRC_TEST];
Dan Williamsf6dbf652009-08-29 19:12:40 -07001102
1103 int i;
1104 struct dma_async_tx_descriptor *tx;
1105 struct dma_chan *dma_chan;
1106 dma_cookie_t cookie;
1107 u32 zero_sum_result;
1108 int err = 0;
1109 struct device *dev;
1110
1111 dev_dbg(device->common.dev, "%s\n", __func__);
1112
1113 for (i = 0; i < ARRAY_SIZE(pq); i++) {
1114 pq[i] = alloc_page(GFP_KERNEL);
1115 if (!pq[i]) {
1116 while (i--)
1117 __free_page(pq[i]);
1118 return -ENOMEM;
1119 }
1120 }
1121
1122 /* Fill in src buffers */
1123 for (i = 0; i < IOP_ADMA_NUM_SRC_TEST; i++) {
1124 pq_sw[i] = page_address(pq[i]);
1125 memset(pq_sw[i], 0x11111111 * (1<<i), PAGE_SIZE);
1126 }
1127 pq_sw[i] = page_address(pq[i]);
1128 pq_sw[i+1] = page_address(pq[i+1]);
1129
1130 dma_chan = container_of(device->common.channels.next,
1131 struct dma_chan,
1132 device_node);
1133 if (iop_adma_alloc_chan_resources(dma_chan) < 1) {
1134 err = -ENODEV;
1135 goto out;
1136 }
1137
1138 dev = dma_chan->device->dev;
1139
1140 /* initialize the dests */
1141 memset(page_address(pq_hw[0]), 0 , PAGE_SIZE);
1142 memset(page_address(pq_hw[1]), 0 , PAGE_SIZE);
1143
1144 /* test pq */
1145 pq_dest[0] = dma_map_page(dev, pq_hw[0], 0, PAGE_SIZE, DMA_FROM_DEVICE);
1146 pq_dest[1] = dma_map_page(dev, pq_hw[1], 0, PAGE_SIZE, DMA_FROM_DEVICE);
1147 for (i = 0; i < IOP_ADMA_NUM_SRC_TEST; i++)
1148 pq_src[i] = dma_map_page(dev, pq[i], 0, PAGE_SIZE,
1149 DMA_TO_DEVICE);
1150
1151 tx = iop_adma_prep_dma_pq(dma_chan, pq_dest, pq_src,
1152 IOP_ADMA_NUM_SRC_TEST, (u8 *)raid6_gfexp,
1153 PAGE_SIZE,
1154 DMA_PREP_INTERRUPT |
1155 DMA_CTRL_ACK);
1156
1157 cookie = iop_adma_tx_submit(tx);
1158 iop_adma_issue_pending(dma_chan);
1159 msleep(8);
1160
Linus Walleij07934482010-03-26 16:50:49 -07001161 if (iop_adma_status(dma_chan, cookie, NULL) !=
Vinod Koul9f5715022013-10-16 20:49:42 +05301162 DMA_COMPLETE) {
Dan Williamsf6dbf652009-08-29 19:12:40 -07001163 dev_err(dev, "Self-test pq timed out, disabling\n");
1164 err = -ENODEV;
1165 goto free_resources;
1166 }
1167
1168 raid6_call.gen_syndrome(IOP_ADMA_NUM_SRC_TEST+2, PAGE_SIZE, pq_sw);
1169
1170 if (memcmp(pq_sw[IOP_ADMA_NUM_SRC_TEST],
1171 page_address(pq_hw[0]), PAGE_SIZE) != 0) {
1172 dev_err(dev, "Self-test p failed compare, disabling\n");
1173 err = -ENODEV;
1174 goto free_resources;
1175 }
1176 if (memcmp(pq_sw[IOP_ADMA_NUM_SRC_TEST+1],
1177 page_address(pq_hw[1]), PAGE_SIZE) != 0) {
1178 dev_err(dev, "Self-test q failed compare, disabling\n");
1179 err = -ENODEV;
1180 goto free_resources;
1181 }
1182
1183 /* test correct zero sum using the software generated pq values */
1184 for (i = 0; i < IOP_ADMA_NUM_SRC_TEST + 2; i++)
1185 pq_src[i] = dma_map_page(dev, pq[i], 0, PAGE_SIZE,
1186 DMA_TO_DEVICE);
1187
1188 zero_sum_result = ~0;
1189 tx = iop_adma_prep_dma_pq_val(dma_chan, &pq_src[IOP_ADMA_NUM_SRC_TEST],
1190 pq_src, IOP_ADMA_NUM_SRC_TEST,
1191 raid6_gfexp, PAGE_SIZE, &zero_sum_result,
1192 DMA_PREP_INTERRUPT|DMA_CTRL_ACK);
1193
1194 cookie = iop_adma_tx_submit(tx);
1195 iop_adma_issue_pending(dma_chan);
1196 msleep(8);
1197
Linus Walleij07934482010-03-26 16:50:49 -07001198 if (iop_adma_status(dma_chan, cookie, NULL) !=
Vinod Koul9f5715022013-10-16 20:49:42 +05301199 DMA_COMPLETE) {
Dan Williamsf6dbf652009-08-29 19:12:40 -07001200 dev_err(dev, "Self-test pq-zero-sum timed out, disabling\n");
1201 err = -ENODEV;
1202 goto free_resources;
1203 }
1204
1205 if (zero_sum_result != 0) {
1206 dev_err(dev, "Self-test pq-zero-sum failed to validate: %x\n",
1207 zero_sum_result);
1208 err = -ENODEV;
1209 goto free_resources;
1210 }
1211
1212 /* test incorrect zero sum */
1213 i = IOP_ADMA_NUM_SRC_TEST;
1214 memset(pq_sw[i] + 100, 0, 100);
1215 memset(pq_sw[i+1] + 200, 0, 200);
1216 for (i = 0; i < IOP_ADMA_NUM_SRC_TEST + 2; i++)
1217 pq_src[i] = dma_map_page(dev, pq[i], 0, PAGE_SIZE,
1218 DMA_TO_DEVICE);
1219
1220 zero_sum_result = 0;
1221 tx = iop_adma_prep_dma_pq_val(dma_chan, &pq_src[IOP_ADMA_NUM_SRC_TEST],
1222 pq_src, IOP_ADMA_NUM_SRC_TEST,
1223 raid6_gfexp, PAGE_SIZE, &zero_sum_result,
1224 DMA_PREP_INTERRUPT|DMA_CTRL_ACK);
1225
1226 cookie = iop_adma_tx_submit(tx);
1227 iop_adma_issue_pending(dma_chan);
1228 msleep(8);
1229
Linus Walleij07934482010-03-26 16:50:49 -07001230 if (iop_adma_status(dma_chan, cookie, NULL) !=
Vinod Koul9f5715022013-10-16 20:49:42 +05301231 DMA_COMPLETE) {
Dan Williamsf6dbf652009-08-29 19:12:40 -07001232 dev_err(dev, "Self-test !pq-zero-sum timed out, disabling\n");
1233 err = -ENODEV;
1234 goto free_resources;
1235 }
1236
1237 if (zero_sum_result != (SUM_CHECK_P_RESULT | SUM_CHECK_Q_RESULT)) {
1238 dev_err(dev, "Self-test !pq-zero-sum failed to validate: %x\n",
1239 zero_sum_result);
1240 err = -ENODEV;
1241 goto free_resources;
1242 }
1243
1244free_resources:
1245 iop_adma_free_chan_resources(dma_chan);
1246out:
1247 i = ARRAY_SIZE(pq);
1248 while (i--)
1249 __free_page(pq[i]);
1250 return err;
1251}
1252#endif
1253
Greg Kroah-Hartman4bf27b82012-12-21 15:09:59 -08001254static int iop_adma_remove(struct platform_device *dev)
Dan Williamsc2110922007-01-02 13:52:26 -07001255{
1256 struct iop_adma_device *device = platform_get_drvdata(dev);
1257 struct dma_chan *chan, *_chan;
1258 struct iop_adma_chan *iop_chan;
Jingoo Hand4adcc02013-07-30 17:09:11 +09001259 struct iop_adma_platform_data *plat_data = dev_get_platdata(&dev->dev);
Dan Williamsc2110922007-01-02 13:52:26 -07001260
1261 dma_async_device_unregister(&device->common);
1262
Dan Williamsc2110922007-01-02 13:52:26 -07001263 dma_free_coherent(&dev->dev, plat_data->pool_size,
1264 device->dma_desc_pool_virt, device->dma_desc_pool);
1265
Dan Williamsc2110922007-01-02 13:52:26 -07001266 list_for_each_entry_safe(chan, _chan, &device->common.channels,
1267 device_node) {
1268 iop_chan = to_iop_adma_chan(chan);
1269 list_del(&chan->device_node);
1270 kfree(iop_chan);
1271 }
1272 kfree(device);
1273
1274 return 0;
1275}
1276
Bill Pemberton463a1f82012-11-19 13:22:55 -05001277static int iop_adma_probe(struct platform_device *pdev)
Dan Williamsc2110922007-01-02 13:52:26 -07001278{
1279 struct resource *res;
1280 int ret = 0, i;
1281 struct iop_adma_device *adev;
1282 struct iop_adma_chan *iop_chan;
1283 struct dma_device *dma_dev;
Jingoo Hand4adcc02013-07-30 17:09:11 +09001284 struct iop_adma_platform_data *plat_data = dev_get_platdata(&pdev->dev);
Dan Williamsc2110922007-01-02 13:52:26 -07001285
1286 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1287 if (!res)
1288 return -ENODEV;
1289
1290 if (!devm_request_mem_region(&pdev->dev, res->start,
H Hartley Sweeten2e032b62009-12-11 21:24:33 -07001291 resource_size(res), pdev->name))
Dan Williamsc2110922007-01-02 13:52:26 -07001292 return -EBUSY;
1293
1294 adev = kzalloc(sizeof(*adev), GFP_KERNEL);
1295 if (!adev)
1296 return -ENOMEM;
1297 dma_dev = &adev->common;
1298
1299 /* allocate coherent memory for hardware descriptors
1300 * note: writecombine gives slightly better performance, but
1301 * requires that we explicitly flush the writes
1302 */
1303 if ((adev->dma_desc_pool_virt = dma_alloc_writecombine(&pdev->dev,
1304 plat_data->pool_size,
1305 &adev->dma_desc_pool,
1306 GFP_KERNEL)) == NULL) {
1307 ret = -ENOMEM;
1308 goto err_free_adev;
1309 }
1310
Masanari Iidab6695e42012-01-27 23:00:53 +09001311 dev_dbg(&pdev->dev, "%s: allocated descriptor pool virt %p phys %p\n",
Harvey Harrison3d9b5252008-03-13 17:45:28 -07001312 __func__, adev->dma_desc_pool_virt,
Dan Williamsc2110922007-01-02 13:52:26 -07001313 (void *) adev->dma_desc_pool);
1314
1315 adev->id = plat_data->hw_id;
1316
1317 /* discover transaction capabilites from the platform data */
1318 dma_dev->cap_mask = plat_data->cap_mask;
1319
1320 adev->pdev = pdev;
1321 platform_set_drvdata(pdev, adev);
1322
1323 INIT_LIST_HEAD(&dma_dev->channels);
1324
1325 /* set base routines */
1326 dma_dev->device_alloc_chan_resources = iop_adma_alloc_chan_resources;
1327 dma_dev->device_free_chan_resources = iop_adma_free_chan_resources;
Linus Walleij07934482010-03-26 16:50:49 -07001328 dma_dev->device_tx_status = iop_adma_status;
Dan Williamsc2110922007-01-02 13:52:26 -07001329 dma_dev->device_issue_pending = iop_adma_issue_pending;
Dan Williamsc2110922007-01-02 13:52:26 -07001330 dma_dev->dev = &pdev->dev;
1331
1332 /* set prep routines based on capability */
1333 if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask))
1334 dma_dev->device_prep_dma_memcpy = iop_adma_prep_dma_memcpy;
Dan Williamsc2110922007-01-02 13:52:26 -07001335 if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) {
1336 dma_dev->max_xor = iop_adma_get_max_xor();
1337 dma_dev->device_prep_dma_xor = iop_adma_prep_dma_xor;
1338 }
Dan Williams099f53c2009-04-08 14:28:37 -07001339 if (dma_has_cap(DMA_XOR_VAL, dma_dev->cap_mask))
1340 dma_dev->device_prep_dma_xor_val =
1341 iop_adma_prep_dma_xor_val;
Dan Williams7bf649a2009-08-28 14:32:04 -07001342 if (dma_has_cap(DMA_PQ, dma_dev->cap_mask)) {
1343 dma_set_maxpq(dma_dev, iop_adma_get_max_pq(), 0);
1344 dma_dev->device_prep_dma_pq = iop_adma_prep_dma_pq;
1345 }
1346 if (dma_has_cap(DMA_PQ_VAL, dma_dev->cap_mask))
1347 dma_dev->device_prep_dma_pq_val =
1348 iop_adma_prep_dma_pq_val;
Dan Williamsc2110922007-01-02 13:52:26 -07001349 if (dma_has_cap(DMA_INTERRUPT, dma_dev->cap_mask))
1350 dma_dev->device_prep_dma_interrupt =
1351 iop_adma_prep_dma_interrupt;
1352
1353 iop_chan = kzalloc(sizeof(*iop_chan), GFP_KERNEL);
1354 if (!iop_chan) {
1355 ret = -ENOMEM;
1356 goto err_free_dma;
1357 }
1358 iop_chan->device = adev;
1359
1360 iop_chan->mmr_base = devm_ioremap(&pdev->dev, res->start,
H Hartley Sweeten2e032b62009-12-11 21:24:33 -07001361 resource_size(res));
Dan Williamsc2110922007-01-02 13:52:26 -07001362 if (!iop_chan->mmr_base) {
1363 ret = -ENOMEM;
1364 goto err_free_iop_chan;
1365 }
1366 tasklet_init(&iop_chan->irq_tasklet, iop_adma_tasklet, (unsigned long)
1367 iop_chan);
1368
1369 /* clear errors before enabling interrupts */
1370 iop_adma_device_clear_err_status(iop_chan);
1371
1372 for (i = 0; i < 3; i++) {
1373 irq_handler_t handler[] = { iop_adma_eot_handler,
1374 iop_adma_eoc_handler,
1375 iop_adma_err_handler };
1376 int irq = platform_get_irq(pdev, i);
1377 if (irq < 0) {
1378 ret = -ENXIO;
1379 goto err_free_iop_chan;
1380 } else {
1381 ret = devm_request_irq(&pdev->dev, irq,
1382 handler[i], 0, pdev->name, iop_chan);
1383 if (ret)
1384 goto err_free_iop_chan;
1385 }
1386 }
1387
1388 spin_lock_init(&iop_chan->lock);
Dan Williamsc2110922007-01-02 13:52:26 -07001389 INIT_LIST_HEAD(&iop_chan->chain);
1390 INIT_LIST_HEAD(&iop_chan->all_slots);
Dan Williamsc2110922007-01-02 13:52:26 -07001391 iop_chan->common.device = dma_dev;
Russell King - ARM Linux8ac69542012-03-06 22:36:27 +00001392 dma_cookie_init(&iop_chan->common);
Dan Williamsc2110922007-01-02 13:52:26 -07001393 list_add_tail(&iop_chan->common.device_node, &dma_dev->channels);
1394
1395 if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask)) {
1396 ret = iop_adma_memcpy_self_test(adev);
1397 dev_dbg(&pdev->dev, "memcpy self test returned %d\n", ret);
1398 if (ret)
1399 goto err_free_iop_chan;
1400 }
1401
Bartlomiej Zolnierkiewicz48a9db42013-07-03 15:05:06 -07001402 if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) {
Dan Williams099f53c2009-04-08 14:28:37 -07001403 ret = iop_adma_xor_val_self_test(adev);
Dan Williamsc2110922007-01-02 13:52:26 -07001404 dev_dbg(&pdev->dev, "xor self test returned %d\n", ret);
1405 if (ret)
1406 goto err_free_iop_chan;
1407 }
1408
Dan Williamsf6dbf652009-08-29 19:12:40 -07001409 if (dma_has_cap(DMA_PQ, dma_dev->cap_mask) &&
1410 dma_has_cap(DMA_PQ_VAL, dma_dev->cap_mask)) {
Wei Yongquan0261f742010-12-29 20:30:55 +08001411 #ifdef CONFIG_RAID6_PQ
Dan Williamsf6dbf652009-08-29 19:12:40 -07001412 ret = iop_adma_pq_zero_sum_self_test(adev);
1413 dev_dbg(&pdev->dev, "pq self test returned %d\n", ret);
1414 #else
1415 /* can not test raid6, so do not publish capability */
1416 dma_cap_clear(DMA_PQ, dma_dev->cap_mask);
1417 dma_cap_clear(DMA_PQ_VAL, dma_dev->cap_mask);
1418 ret = 0;
1419 #endif
1420 if (ret)
1421 goto err_free_iop_chan;
1422 }
1423
Olof Johanssonf9f0a7d2013-07-08 15:59:35 -07001424 dev_info(&pdev->dev, "Intel(R) IOP: ( %s%s%s%s%s%s)\n",
Joe Perches1ba151c2012-10-28 01:05:44 -07001425 dma_has_cap(DMA_PQ, dma_dev->cap_mask) ? "pq " : "",
1426 dma_has_cap(DMA_PQ_VAL, dma_dev->cap_mask) ? "pq_val " : "",
1427 dma_has_cap(DMA_XOR, dma_dev->cap_mask) ? "xor " : "",
1428 dma_has_cap(DMA_XOR_VAL, dma_dev->cap_mask) ? "xor_val " : "",
Joe Perches1ba151c2012-10-28 01:05:44 -07001429 dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask) ? "cpy " : "",
1430 dma_has_cap(DMA_INTERRUPT, dma_dev->cap_mask) ? "intr " : "");
Dan Williamsc2110922007-01-02 13:52:26 -07001431
1432 dma_async_device_register(dma_dev);
1433 goto out;
1434
1435 err_free_iop_chan:
1436 kfree(iop_chan);
1437 err_free_dma:
1438 dma_free_coherent(&adev->pdev->dev, plat_data->pool_size,
1439 adev->dma_desc_pool_virt, adev->dma_desc_pool);
1440 err_free_adev:
1441 kfree(adev);
1442 out:
1443 return ret;
1444}
1445
1446static void iop_chan_start_null_memcpy(struct iop_adma_chan *iop_chan)
1447{
1448 struct iop_adma_desc_slot *sw_desc, *grp_start;
1449 dma_cookie_t cookie;
1450 int slot_cnt, slots_per_op;
1451
Harvey Harrison3d9b5252008-03-13 17:45:28 -07001452 dev_dbg(iop_chan->device->common.dev, "%s\n", __func__);
Dan Williamsc2110922007-01-02 13:52:26 -07001453
1454 spin_lock_bh(&iop_chan->lock);
1455 slot_cnt = iop_chan_memcpy_slot_count(0, &slots_per_op);
1456 sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
1457 if (sw_desc) {
1458 grp_start = sw_desc->group_head;
1459
Dan Williams308136d2009-09-08 17:53:02 -07001460 list_splice_init(&sw_desc->tx_list, &iop_chan->chain);
Dan Williams636bdea2008-04-17 20:17:26 -07001461 async_tx_ack(&sw_desc->async_tx);
Dan Williamsc2110922007-01-02 13:52:26 -07001462 iop_desc_init_memcpy(grp_start, 0);
1463 iop_desc_set_byte_count(grp_start, iop_chan, 0);
1464 iop_desc_set_dest_addr(grp_start, iop_chan, 0);
1465 iop_desc_set_memcpy_src_addr(grp_start, 0);
1466
Russell King - ARM Linux2a926e42012-03-06 22:36:07 +00001467 cookie = dma_cookie_assign(&sw_desc->async_tx);
Dan Williamsc2110922007-01-02 13:52:26 -07001468
1469 /* initialize the completed cookie to be less than
1470 * the most recently used cookie
1471 */
Russell King - ARM Linux4d4e58d2012-03-06 22:34:06 +00001472 iop_chan->common.completed_cookie = cookie - 1;
Dan Williamsc2110922007-01-02 13:52:26 -07001473
1474 /* channel should not be busy */
1475 BUG_ON(iop_chan_is_busy(iop_chan));
1476
1477 /* clear any prior error-status bits */
1478 iop_adma_device_clear_err_status(iop_chan);
1479
1480 /* disable operation */
1481 iop_chan_disable(iop_chan);
1482
1483 /* set the descriptor address */
1484 iop_chan_set_next_descriptor(iop_chan, sw_desc->async_tx.phys);
1485
1486 /* 1/ don't add pre-chained descriptors
1487 * 2/ dummy read to flush next_desc write
1488 */
1489 BUG_ON(iop_desc_get_next_desc(sw_desc));
1490
1491 /* run the descriptor */
1492 iop_chan_enable(iop_chan);
1493 } else
Joe Perches1ba151c2012-10-28 01:05:44 -07001494 dev_err(iop_chan->device->common.dev,
1495 "failed to allocate null descriptor\n");
Dan Williamsc2110922007-01-02 13:52:26 -07001496 spin_unlock_bh(&iop_chan->lock);
1497}
1498
1499static void iop_chan_start_null_xor(struct iop_adma_chan *iop_chan)
1500{
1501 struct iop_adma_desc_slot *sw_desc, *grp_start;
1502 dma_cookie_t cookie;
1503 int slot_cnt, slots_per_op;
1504
Harvey Harrison3d9b5252008-03-13 17:45:28 -07001505 dev_dbg(iop_chan->device->common.dev, "%s\n", __func__);
Dan Williamsc2110922007-01-02 13:52:26 -07001506
1507 spin_lock_bh(&iop_chan->lock);
1508 slot_cnt = iop_chan_xor_slot_count(0, 2, &slots_per_op);
1509 sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
1510 if (sw_desc) {
1511 grp_start = sw_desc->group_head;
Dan Williams308136d2009-09-08 17:53:02 -07001512 list_splice_init(&sw_desc->tx_list, &iop_chan->chain);
Dan Williams636bdea2008-04-17 20:17:26 -07001513 async_tx_ack(&sw_desc->async_tx);
Dan Williamsc2110922007-01-02 13:52:26 -07001514 iop_desc_init_null_xor(grp_start, 2, 0);
1515 iop_desc_set_byte_count(grp_start, iop_chan, 0);
1516 iop_desc_set_dest_addr(grp_start, iop_chan, 0);
1517 iop_desc_set_xor_src_addr(grp_start, 0, 0);
1518 iop_desc_set_xor_src_addr(grp_start, 1, 0);
1519
Russell King - ARM Linux2a926e42012-03-06 22:36:07 +00001520 cookie = dma_cookie_assign(&sw_desc->async_tx);
Dan Williamsc2110922007-01-02 13:52:26 -07001521
1522 /* initialize the completed cookie to be less than
1523 * the most recently used cookie
1524 */
Russell King - ARM Linux4d4e58d2012-03-06 22:34:06 +00001525 iop_chan->common.completed_cookie = cookie - 1;
Dan Williamsc2110922007-01-02 13:52:26 -07001526
1527 /* channel should not be busy */
1528 BUG_ON(iop_chan_is_busy(iop_chan));
1529
1530 /* clear any prior error-status bits */
1531 iop_adma_device_clear_err_status(iop_chan);
1532
1533 /* disable operation */
1534 iop_chan_disable(iop_chan);
1535
1536 /* set the descriptor address */
1537 iop_chan_set_next_descriptor(iop_chan, sw_desc->async_tx.phys);
1538
1539 /* 1/ don't add pre-chained descriptors
1540 * 2/ dummy read to flush next_desc write
1541 */
1542 BUG_ON(iop_desc_get_next_desc(sw_desc));
1543
1544 /* run the descriptor */
1545 iop_chan_enable(iop_chan);
1546 } else
Joe Perches1ba151c2012-10-28 01:05:44 -07001547 dev_err(iop_chan->device->common.dev,
Dan Williamsc2110922007-01-02 13:52:26 -07001548 "failed to allocate null descriptor\n");
1549 spin_unlock_bh(&iop_chan->lock);
1550}
1551
1552static struct platform_driver iop_adma_driver = {
1553 .probe = iop_adma_probe,
Bill Pembertona7d6e3e2012-11-19 13:20:04 -05001554 .remove = iop_adma_remove,
Dan Williamsc2110922007-01-02 13:52:26 -07001555 .driver = {
Dan Williamsc2110922007-01-02 13:52:26 -07001556 .name = "iop-adma",
1557 },
1558};
1559
Axel Linc94e9102011-11-26 15:11:12 +08001560module_platform_driver(iop_adma_driver);
Dan Williamsc2110922007-01-02 13:52:26 -07001561
1562MODULE_AUTHOR("Intel Corporation");
1563MODULE_DESCRIPTION("IOP ADMA Engine Driver");
1564MODULE_LICENSE("GPL");
Axel Linc94e9102011-11-26 15:11:12 +08001565MODULE_ALIAS("platform:iop-adma");