Commit | Line | Data |
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c2110923 DW |
1 | /* |
2 | * offload engine driver for the Intel Xscale series of i/o processors | |
3 | * Copyright © 2006, Intel Corporation. | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms and conditions of the GNU General Public License, | |
7 | * version 2, as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License along with | |
15 | * this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. | |
17 | * | |
18 | */ | |
19 | ||
20 | /* | |
21 | * This driver supports the asynchrounous DMA copy and RAID engines available | |
22 | * on the Intel Xscale(R) family of I/O Processors (IOP 32x, 33x, 134x) | |
23 | */ | |
24 | ||
25 | #include <linux/init.h> | |
26 | #include <linux/module.h> | |
27 | #include <linux/async_tx.h> | |
28 | #include <linux/delay.h> | |
29 | #include <linux/dma-mapping.h> | |
30 | #include <linux/spinlock.h> | |
31 | #include <linux/interrupt.h> | |
32 | #include <linux/platform_device.h> | |
33 | #include <linux/memory.h> | |
34 | #include <linux/ioport.h> | |
35 | ||
36 | #include <asm/arch/adma.h> | |
37 | ||
38 | #define to_iop_adma_chan(chan) container_of(chan, struct iop_adma_chan, common) | |
39 | #define to_iop_adma_device(dev) \ | |
40 | container_of(dev, struct iop_adma_device, common) | |
41 | #define tx_to_iop_adma_slot(tx) \ | |
42 | container_of(tx, struct iop_adma_desc_slot, async_tx) | |
43 | ||
44 | /** | |
45 | * iop_adma_free_slots - flags descriptor slots for reuse | |
46 | * @slot: Slot to free | |
47 | * Caller must hold &iop_chan->lock while calling this function | |
48 | */ | |
49 | static void iop_adma_free_slots(struct iop_adma_desc_slot *slot) | |
50 | { | |
51 | int stride = slot->slots_per_op; | |
52 | ||
53 | while (stride--) { | |
54 | slot->slots_per_op = 0; | |
55 | slot = list_entry(slot->slot_node.next, | |
56 | struct iop_adma_desc_slot, | |
57 | slot_node); | |
58 | } | |
59 | } | |
60 | ||
61 | static dma_cookie_t | |
62 | iop_adma_run_tx_complete_actions(struct iop_adma_desc_slot *desc, | |
63 | struct iop_adma_chan *iop_chan, dma_cookie_t cookie) | |
64 | { | |
65 | BUG_ON(desc->async_tx.cookie < 0); | |
66 | spin_lock_bh(&desc->async_tx.lock); | |
67 | if (desc->async_tx.cookie > 0) { | |
68 | cookie = desc->async_tx.cookie; | |
69 | desc->async_tx.cookie = 0; | |
70 | ||
71 | /* call the callback (must not sleep or submit new | |
72 | * operations to this channel) | |
73 | */ | |
74 | if (desc->async_tx.callback) | |
75 | desc->async_tx.callback( | |
76 | desc->async_tx.callback_param); | |
77 | ||
78 | /* unmap dma addresses | |
79 | * (unmap_single vs unmap_page?) | |
80 | */ | |
81 | if (desc->group_head && desc->unmap_len) { | |
82 | struct iop_adma_desc_slot *unmap = desc->group_head; | |
83 | struct device *dev = | |
84 | &iop_chan->device->pdev->dev; | |
85 | u32 len = unmap->unmap_len; | |
86 | u32 src_cnt = unmap->unmap_src_cnt; | |
87 | dma_addr_t addr = iop_desc_get_dest_addr(unmap, | |
88 | iop_chan); | |
89 | ||
90 | dma_unmap_page(dev, addr, len, DMA_FROM_DEVICE); | |
91 | while (src_cnt--) { | |
92 | addr = iop_desc_get_src_addr(unmap, | |
93 | iop_chan, | |
94 | src_cnt); | |
95 | dma_unmap_page(dev, addr, len, | |
96 | DMA_TO_DEVICE); | |
97 | } | |
98 | desc->group_head = NULL; | |
99 | } | |
100 | } | |
101 | ||
102 | /* run dependent operations */ | |
103 | async_tx_run_dependencies(&desc->async_tx); | |
104 | spin_unlock_bh(&desc->async_tx.lock); | |
105 | ||
106 | return cookie; | |
107 | } | |
108 | ||
109 | static int | |
110 | iop_adma_clean_slot(struct iop_adma_desc_slot *desc, | |
111 | struct iop_adma_chan *iop_chan) | |
112 | { | |
113 | /* the client is allowed to attach dependent operations | |
114 | * until 'ack' is set | |
115 | */ | |
116 | if (!desc->async_tx.ack) | |
117 | return 0; | |
118 | ||
119 | /* leave the last descriptor in the chain | |
120 | * so we can append to it | |
121 | */ | |
122 | if (desc->chain_node.next == &iop_chan->chain) | |
123 | return 1; | |
124 | ||
125 | dev_dbg(iop_chan->device->common.dev, | |
126 | "\tfree slot: %d slots_per_op: %d\n", | |
127 | desc->idx, desc->slots_per_op); | |
128 | ||
129 | list_del(&desc->chain_node); | |
130 | iop_adma_free_slots(desc); | |
131 | ||
132 | return 0; | |
133 | } | |
134 | ||
135 | static void __iop_adma_slot_cleanup(struct iop_adma_chan *iop_chan) | |
136 | { | |
137 | struct iop_adma_desc_slot *iter, *_iter, *grp_start = NULL; | |
138 | dma_cookie_t cookie = 0; | |
139 | u32 current_desc = iop_chan_get_current_descriptor(iop_chan); | |
140 | int busy = iop_chan_is_busy(iop_chan); | |
141 | int seen_current = 0, slot_cnt = 0, slots_per_op = 0; | |
142 | ||
143 | dev_dbg(iop_chan->device->common.dev, "%s\n", __FUNCTION__); | |
144 | /* free completed slots from the chain starting with | |
145 | * the oldest descriptor | |
146 | */ | |
147 | list_for_each_entry_safe(iter, _iter, &iop_chan->chain, | |
148 | chain_node) { | |
149 | pr_debug("\tcookie: %d slot: %d busy: %d " | |
150 | "this_desc: %#x next_desc: %#x ack: %d\n", | |
151 | iter->async_tx.cookie, iter->idx, busy, | |
152 | iter->async_tx.phys, iop_desc_get_next_desc(iter), | |
153 | iter->async_tx.ack); | |
154 | prefetch(_iter); | |
155 | prefetch(&_iter->async_tx); | |
156 | ||
157 | /* do not advance past the current descriptor loaded into the | |
158 | * hardware channel, subsequent descriptors are either in | |
159 | * process or have not been submitted | |
160 | */ | |
161 | if (seen_current) | |
162 | break; | |
163 | ||
164 | /* stop the search if we reach the current descriptor and the | |
165 | * channel is busy, or if it appears that the current descriptor | |
166 | * needs to be re-read (i.e. has been appended to) | |
167 | */ | |
168 | if (iter->async_tx.phys == current_desc) { | |
169 | BUG_ON(seen_current++); | |
170 | if (busy || iop_desc_get_next_desc(iter)) | |
171 | break; | |
172 | } | |
173 | ||
174 | /* detect the start of a group transaction */ | |
175 | if (!slot_cnt && !slots_per_op) { | |
176 | slot_cnt = iter->slot_cnt; | |
177 | slots_per_op = iter->slots_per_op; | |
178 | if (slot_cnt <= slots_per_op) { | |
179 | slot_cnt = 0; | |
180 | slots_per_op = 0; | |
181 | } | |
182 | } | |
183 | ||
184 | if (slot_cnt) { | |
185 | pr_debug("\tgroup++\n"); | |
186 | if (!grp_start) | |
187 | grp_start = iter; | |
188 | slot_cnt -= slots_per_op; | |
189 | } | |
190 | ||
191 | /* all the members of a group are complete */ | |
192 | if (slots_per_op != 0 && slot_cnt == 0) { | |
193 | struct iop_adma_desc_slot *grp_iter, *_grp_iter; | |
194 | int end_of_chain = 0; | |
195 | pr_debug("\tgroup end\n"); | |
196 | ||
197 | /* collect the total results */ | |
198 | if (grp_start->xor_check_result) { | |
199 | u32 zero_sum_result = 0; | |
200 | slot_cnt = grp_start->slot_cnt; | |
201 | grp_iter = grp_start; | |
202 | ||
203 | list_for_each_entry_from(grp_iter, | |
204 | &iop_chan->chain, chain_node) { | |
205 | zero_sum_result |= | |
206 | iop_desc_get_zero_result(grp_iter); | |
207 | pr_debug("\titer%d result: %d\n", | |
208 | grp_iter->idx, zero_sum_result); | |
209 | slot_cnt -= slots_per_op; | |
210 | if (slot_cnt == 0) | |
211 | break; | |
212 | } | |
213 | pr_debug("\tgrp_start->xor_check_result: %p\n", | |
214 | grp_start->xor_check_result); | |
215 | *grp_start->xor_check_result = zero_sum_result; | |
216 | } | |
217 | ||
218 | /* clean up the group */ | |
219 | slot_cnt = grp_start->slot_cnt; | |
220 | grp_iter = grp_start; | |
221 | list_for_each_entry_safe_from(grp_iter, _grp_iter, | |
222 | &iop_chan->chain, chain_node) { | |
223 | cookie = iop_adma_run_tx_complete_actions( | |
224 | grp_iter, iop_chan, cookie); | |
225 | ||
226 | slot_cnt -= slots_per_op; | |
227 | end_of_chain = iop_adma_clean_slot(grp_iter, | |
228 | iop_chan); | |
229 | ||
230 | if (slot_cnt == 0 || end_of_chain) | |
231 | break; | |
232 | } | |
233 | ||
234 | /* the group should be complete at this point */ | |
235 | BUG_ON(slot_cnt); | |
236 | ||
237 | slots_per_op = 0; | |
238 | grp_start = NULL; | |
239 | if (end_of_chain) | |
240 | break; | |
241 | else | |
242 | continue; | |
243 | } else if (slots_per_op) /* wait for group completion */ | |
244 | continue; | |
245 | ||
246 | /* write back zero sum results (single descriptor case) */ | |
247 | if (iter->xor_check_result && iter->async_tx.cookie) | |
248 | *iter->xor_check_result = | |
249 | iop_desc_get_zero_result(iter); | |
250 | ||
251 | cookie = iop_adma_run_tx_complete_actions( | |
252 | iter, iop_chan, cookie); | |
253 | ||
254 | if (iop_adma_clean_slot(iter, iop_chan)) | |
255 | break; | |
256 | } | |
257 | ||
258 | BUG_ON(!seen_current); | |
259 | ||
260 | iop_chan_idle(busy, iop_chan); | |
261 | ||
262 | if (cookie > 0) { | |
263 | iop_chan->completed_cookie = cookie; | |
264 | pr_debug("\tcompleted cookie %d\n", cookie); | |
265 | } | |
266 | } | |
267 | ||
268 | static void | |
269 | iop_adma_slot_cleanup(struct iop_adma_chan *iop_chan) | |
270 | { | |
271 | spin_lock_bh(&iop_chan->lock); | |
272 | __iop_adma_slot_cleanup(iop_chan); | |
273 | spin_unlock_bh(&iop_chan->lock); | |
274 | } | |
275 | ||
276 | static void iop_adma_tasklet(unsigned long data) | |
277 | { | |
278 | struct iop_adma_chan *chan = (struct iop_adma_chan *) data; | |
279 | __iop_adma_slot_cleanup(chan); | |
280 | } | |
281 | ||
282 | static struct iop_adma_desc_slot * | |
283 | iop_adma_alloc_slots(struct iop_adma_chan *iop_chan, int num_slots, | |
284 | int slots_per_op) | |
285 | { | |
286 | struct iop_adma_desc_slot *iter, *_iter, *alloc_start = NULL; | |
287 | struct list_head chain = LIST_HEAD_INIT(chain); | |
288 | int slots_found, retry = 0; | |
289 | ||
290 | /* start search from the last allocated descrtiptor | |
291 | * if a contiguous allocation can not be found start searching | |
292 | * from the beginning of the list | |
293 | */ | |
294 | retry: | |
295 | slots_found = 0; | |
296 | if (retry == 0) | |
297 | iter = iop_chan->last_used; | |
298 | else | |
299 | iter = list_entry(&iop_chan->all_slots, | |
300 | struct iop_adma_desc_slot, | |
301 | slot_node); | |
302 | ||
303 | list_for_each_entry_safe_continue( | |
304 | iter, _iter, &iop_chan->all_slots, slot_node) { | |
305 | prefetch(_iter); | |
306 | prefetch(&_iter->async_tx); | |
307 | if (iter->slots_per_op) { | |
308 | /* give up after finding the first busy slot | |
309 | * on the second pass through the list | |
310 | */ | |
311 | if (retry) | |
312 | break; | |
313 | ||
314 | slots_found = 0; | |
315 | continue; | |
316 | } | |
317 | ||
318 | /* start the allocation if the slot is correctly aligned */ | |
319 | if (!slots_found++) { | |
320 | if (iop_desc_is_aligned(iter, slots_per_op)) | |
321 | alloc_start = iter; | |
322 | else { | |
323 | slots_found = 0; | |
324 | continue; | |
325 | } | |
326 | } | |
327 | ||
328 | if (slots_found == num_slots) { | |
329 | struct iop_adma_desc_slot *alloc_tail = NULL; | |
330 | struct iop_adma_desc_slot *last_used = NULL; | |
331 | iter = alloc_start; | |
332 | while (num_slots) { | |
333 | int i; | |
334 | dev_dbg(iop_chan->device->common.dev, | |
335 | "allocated slot: %d " | |
336 | "(desc %p phys: %#x) slots_per_op %d\n", | |
337 | iter->idx, iter->hw_desc, | |
338 | iter->async_tx.phys, slots_per_op); | |
339 | ||
340 | /* pre-ack all but the last descriptor */ | |
341 | if (num_slots != slots_per_op) | |
342 | iter->async_tx.ack = 1; | |
343 | else | |
344 | iter->async_tx.ack = 0; | |
345 | ||
346 | list_add_tail(&iter->chain_node, &chain); | |
347 | alloc_tail = iter; | |
348 | iter->async_tx.cookie = 0; | |
349 | iter->slot_cnt = num_slots; | |
350 | iter->xor_check_result = NULL; | |
351 | for (i = 0; i < slots_per_op; i++) { | |
352 | iter->slots_per_op = slots_per_op - i; | |
353 | last_used = iter; | |
354 | iter = list_entry(iter->slot_node.next, | |
355 | struct iop_adma_desc_slot, | |
356 | slot_node); | |
357 | } | |
358 | num_slots -= slots_per_op; | |
359 | } | |
360 | alloc_tail->group_head = alloc_start; | |
361 | alloc_tail->async_tx.cookie = -EBUSY; | |
362 | list_splice(&chain, &alloc_tail->async_tx.tx_list); | |
363 | iop_chan->last_used = last_used; | |
364 | iop_desc_clear_next_desc(alloc_start); | |
365 | iop_desc_clear_next_desc(alloc_tail); | |
366 | return alloc_tail; | |
367 | } | |
368 | } | |
369 | if (!retry++) | |
370 | goto retry; | |
371 | ||
372 | /* try to free some slots if the allocation fails */ | |
373 | tasklet_schedule(&iop_chan->irq_tasklet); | |
374 | ||
375 | return NULL; | |
376 | } | |
377 | ||
378 | static dma_cookie_t | |
379 | iop_desc_assign_cookie(struct iop_adma_chan *iop_chan, | |
380 | struct iop_adma_desc_slot *desc) | |
381 | { | |
382 | dma_cookie_t cookie = iop_chan->common.cookie; | |
383 | cookie++; | |
384 | if (cookie < 0) | |
385 | cookie = 1; | |
386 | iop_chan->common.cookie = desc->async_tx.cookie = cookie; | |
387 | return cookie; | |
388 | } | |
389 | ||
390 | static void iop_adma_check_threshold(struct iop_adma_chan *iop_chan) | |
391 | { | |
392 | dev_dbg(iop_chan->device->common.dev, "pending: %d\n", | |
393 | iop_chan->pending); | |
394 | ||
395 | if (iop_chan->pending >= IOP_ADMA_THRESHOLD) { | |
396 | iop_chan->pending = 0; | |
397 | iop_chan_append(iop_chan); | |
398 | } | |
399 | } | |
400 | ||
401 | static dma_cookie_t | |
402 | iop_adma_tx_submit(struct dma_async_tx_descriptor *tx) | |
403 | { | |
404 | struct iop_adma_desc_slot *sw_desc = tx_to_iop_adma_slot(tx); | |
405 | struct iop_adma_chan *iop_chan = to_iop_adma_chan(tx->chan); | |
406 | struct iop_adma_desc_slot *grp_start, *old_chain_tail; | |
407 | int slot_cnt; | |
408 | int slots_per_op; | |
409 | dma_cookie_t cookie; | |
410 | ||
411 | grp_start = sw_desc->group_head; | |
412 | slot_cnt = grp_start->slot_cnt; | |
413 | slots_per_op = grp_start->slots_per_op; | |
414 | ||
415 | spin_lock_bh(&iop_chan->lock); | |
416 | cookie = iop_desc_assign_cookie(iop_chan, sw_desc); | |
417 | ||
418 | old_chain_tail = list_entry(iop_chan->chain.prev, | |
419 | struct iop_adma_desc_slot, chain_node); | |
420 | list_splice_init(&sw_desc->async_tx.tx_list, | |
421 | &old_chain_tail->chain_node); | |
422 | ||
423 | /* fix up the hardware chain */ | |
424 | iop_desc_set_next_desc(old_chain_tail, grp_start->async_tx.phys); | |
425 | ||
426 | /* 1/ don't add pre-chained descriptors | |
427 | * 2/ dummy read to flush next_desc write | |
428 | */ | |
429 | BUG_ON(iop_desc_get_next_desc(sw_desc)); | |
430 | ||
431 | /* increment the pending count by the number of slots | |
432 | * memcpy operations have a 1:1 (slot:operation) relation | |
433 | * other operations are heavier and will pop the threshold | |
434 | * more often. | |
435 | */ | |
436 | iop_chan->pending += slot_cnt; | |
437 | iop_adma_check_threshold(iop_chan); | |
438 | spin_unlock_bh(&iop_chan->lock); | |
439 | ||
440 | dev_dbg(iop_chan->device->common.dev, "%s cookie: %d slot: %d\n", | |
441 | __FUNCTION__, sw_desc->async_tx.cookie, sw_desc->idx); | |
442 | ||
443 | return cookie; | |
444 | } | |
445 | ||
446 | static void | |
447 | iop_adma_set_dest(dma_addr_t addr, struct dma_async_tx_descriptor *tx, | |
448 | int index) | |
449 | { | |
450 | struct iop_adma_desc_slot *sw_desc = tx_to_iop_adma_slot(tx); | |
451 | struct iop_adma_chan *iop_chan = to_iop_adma_chan(tx->chan); | |
452 | ||
453 | /* to do: support transfers lengths > IOP_ADMA_MAX_BYTE_COUNT */ | |
454 | iop_desc_set_dest_addr(sw_desc->group_head, iop_chan, addr); | |
455 | } | |
456 | ||
457 | static void iop_chan_start_null_memcpy(struct iop_adma_chan *iop_chan); | |
458 | static void iop_chan_start_null_xor(struct iop_adma_chan *iop_chan); | |
459 | ||
460 | /* returns the number of allocated descriptors */ | |
461 | static int iop_adma_alloc_chan_resources(struct dma_chan *chan) | |
462 | { | |
463 | char *hw_desc; | |
464 | int idx; | |
465 | struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan); | |
466 | struct iop_adma_desc_slot *slot = NULL; | |
467 | int init = iop_chan->slots_allocated ? 0 : 1; | |
468 | struct iop_adma_platform_data *plat_data = | |
469 | iop_chan->device->pdev->dev.platform_data; | |
470 | int num_descs_in_pool = plat_data->pool_size/IOP_ADMA_SLOT_SIZE; | |
471 | ||
472 | /* Allocate descriptor slots */ | |
473 | do { | |
474 | idx = iop_chan->slots_allocated; | |
475 | if (idx == num_descs_in_pool) | |
476 | break; | |
477 | ||
478 | slot = kzalloc(sizeof(*slot), GFP_KERNEL); | |
479 | if (!slot) { | |
480 | printk(KERN_INFO "IOP ADMA Channel only initialized" | |
481 | " %d descriptor slots", idx); | |
482 | break; | |
483 | } | |
484 | hw_desc = (char *) iop_chan->device->dma_desc_pool_virt; | |
485 | slot->hw_desc = (void *) &hw_desc[idx * IOP_ADMA_SLOT_SIZE]; | |
486 | ||
487 | dma_async_tx_descriptor_init(&slot->async_tx, chan); | |
488 | slot->async_tx.tx_submit = iop_adma_tx_submit; | |
489 | slot->async_tx.tx_set_dest = iop_adma_set_dest; | |
490 | INIT_LIST_HEAD(&slot->chain_node); | |
491 | INIT_LIST_HEAD(&slot->slot_node); | |
492 | INIT_LIST_HEAD(&slot->async_tx.tx_list); | |
493 | hw_desc = (char *) iop_chan->device->dma_desc_pool; | |
494 | slot->async_tx.phys = | |
495 | (dma_addr_t) &hw_desc[idx * IOP_ADMA_SLOT_SIZE]; | |
496 | slot->idx = idx; | |
497 | ||
498 | spin_lock_bh(&iop_chan->lock); | |
499 | iop_chan->slots_allocated++; | |
500 | list_add_tail(&slot->slot_node, &iop_chan->all_slots); | |
501 | spin_unlock_bh(&iop_chan->lock); | |
502 | } while (iop_chan->slots_allocated < num_descs_in_pool); | |
503 | ||
504 | if (idx && !iop_chan->last_used) | |
505 | iop_chan->last_used = list_entry(iop_chan->all_slots.next, | |
506 | struct iop_adma_desc_slot, | |
507 | slot_node); | |
508 | ||
509 | dev_dbg(iop_chan->device->common.dev, | |
510 | "allocated %d descriptor slots last_used: %p\n", | |
511 | iop_chan->slots_allocated, iop_chan->last_used); | |
512 | ||
513 | /* initialize the channel and the chain with a null operation */ | |
514 | if (init) { | |
515 | if (dma_has_cap(DMA_MEMCPY, | |
516 | iop_chan->device->common.cap_mask)) | |
517 | iop_chan_start_null_memcpy(iop_chan); | |
518 | else if (dma_has_cap(DMA_XOR, | |
519 | iop_chan->device->common.cap_mask)) | |
520 | iop_chan_start_null_xor(iop_chan); | |
521 | else | |
522 | BUG(); | |
523 | } | |
524 | ||
525 | return (idx > 0) ? idx : -ENOMEM; | |
526 | } | |
527 | ||
528 | static struct dma_async_tx_descriptor * | |
529 | iop_adma_prep_dma_interrupt(struct dma_chan *chan) | |
530 | { | |
531 | struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan); | |
532 | struct iop_adma_desc_slot *sw_desc, *grp_start; | |
533 | int slot_cnt, slots_per_op; | |
534 | ||
535 | dev_dbg(iop_chan->device->common.dev, "%s\n", __FUNCTION__); | |
536 | ||
537 | spin_lock_bh(&iop_chan->lock); | |
538 | slot_cnt = iop_chan_interrupt_slot_count(&slots_per_op, iop_chan); | |
539 | sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op); | |
540 | if (sw_desc) { | |
541 | grp_start = sw_desc->group_head; | |
542 | iop_desc_init_interrupt(grp_start, iop_chan); | |
543 | grp_start->unmap_len = 0; | |
544 | } | |
545 | spin_unlock_bh(&iop_chan->lock); | |
546 | ||
547 | return sw_desc ? &sw_desc->async_tx : NULL; | |
548 | } | |
549 | ||
550 | static void | |
551 | iop_adma_memcpy_set_src(dma_addr_t addr, struct dma_async_tx_descriptor *tx, | |
552 | int index) | |
553 | { | |
554 | struct iop_adma_desc_slot *sw_desc = tx_to_iop_adma_slot(tx); | |
555 | struct iop_adma_desc_slot *grp_start = sw_desc->group_head; | |
556 | ||
557 | iop_desc_set_memcpy_src_addr(grp_start, addr); | |
558 | } | |
559 | ||
560 | static struct dma_async_tx_descriptor * | |
561 | iop_adma_prep_dma_memcpy(struct dma_chan *chan, size_t len, int int_en) | |
562 | { | |
563 | struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan); | |
564 | struct iop_adma_desc_slot *sw_desc, *grp_start; | |
565 | int slot_cnt, slots_per_op; | |
566 | ||
567 | if (unlikely(!len)) | |
568 | return NULL; | |
569 | BUG_ON(unlikely(len > IOP_ADMA_MAX_BYTE_COUNT)); | |
570 | ||
571 | dev_dbg(iop_chan->device->common.dev, "%s len: %u\n", | |
572 | __FUNCTION__, len); | |
573 | ||
574 | spin_lock_bh(&iop_chan->lock); | |
575 | slot_cnt = iop_chan_memcpy_slot_count(len, &slots_per_op); | |
576 | sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op); | |
577 | if (sw_desc) { | |
578 | grp_start = sw_desc->group_head; | |
579 | iop_desc_init_memcpy(grp_start, int_en); | |
580 | iop_desc_set_byte_count(grp_start, iop_chan, len); | |
581 | sw_desc->unmap_src_cnt = 1; | |
582 | sw_desc->unmap_len = len; | |
583 | sw_desc->async_tx.tx_set_src = iop_adma_memcpy_set_src; | |
584 | } | |
585 | spin_unlock_bh(&iop_chan->lock); | |
586 | ||
587 | return sw_desc ? &sw_desc->async_tx : NULL; | |
588 | } | |
589 | ||
590 | static struct dma_async_tx_descriptor * | |
591 | iop_adma_prep_dma_memset(struct dma_chan *chan, int value, size_t len, | |
592 | int int_en) | |
593 | { | |
594 | struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan); | |
595 | struct iop_adma_desc_slot *sw_desc, *grp_start; | |
596 | int slot_cnt, slots_per_op; | |
597 | ||
598 | if (unlikely(!len)) | |
599 | return NULL; | |
600 | BUG_ON(unlikely(len > IOP_ADMA_MAX_BYTE_COUNT)); | |
601 | ||
602 | dev_dbg(iop_chan->device->common.dev, "%s len: %u\n", | |
603 | __FUNCTION__, len); | |
604 | ||
605 | spin_lock_bh(&iop_chan->lock); | |
606 | slot_cnt = iop_chan_memset_slot_count(len, &slots_per_op); | |
607 | sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op); | |
608 | if (sw_desc) { | |
609 | grp_start = sw_desc->group_head; | |
610 | iop_desc_init_memset(grp_start, int_en); | |
611 | iop_desc_set_byte_count(grp_start, iop_chan, len); | |
612 | iop_desc_set_block_fill_val(grp_start, value); | |
613 | sw_desc->unmap_src_cnt = 1; | |
614 | sw_desc->unmap_len = len; | |
615 | } | |
616 | spin_unlock_bh(&iop_chan->lock); | |
617 | ||
618 | return sw_desc ? &sw_desc->async_tx : NULL; | |
619 | } | |
620 | ||
621 | static void | |
622 | iop_adma_xor_set_src(dma_addr_t addr, struct dma_async_tx_descriptor *tx, | |
623 | int index) | |
624 | { | |
625 | struct iop_adma_desc_slot *sw_desc = tx_to_iop_adma_slot(tx); | |
626 | struct iop_adma_desc_slot *grp_start = sw_desc->group_head; | |
627 | ||
628 | iop_desc_set_xor_src_addr(grp_start, index, addr); | |
629 | } | |
630 | ||
631 | static struct dma_async_tx_descriptor * | |
632 | iop_adma_prep_dma_xor(struct dma_chan *chan, unsigned int src_cnt, size_t len, | |
633 | int int_en) | |
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 int_en: %d\n", | |
645 | __FUNCTION__, src_cnt, len, int_en); | |
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, int_en); | |
653 | iop_desc_set_byte_count(grp_start, iop_chan, len); | |
654 | sw_desc->unmap_src_cnt = src_cnt; | |
655 | sw_desc->unmap_len = len; | |
656 | sw_desc->async_tx.tx_set_src = iop_adma_xor_set_src; | |
657 | } | |
658 | spin_unlock_bh(&iop_chan->lock); | |
659 | ||
660 | return sw_desc ? &sw_desc->async_tx : NULL; | |
661 | } | |
662 | ||
663 | static void | |
664 | iop_adma_xor_zero_sum_set_src(dma_addr_t addr, | |
665 | struct dma_async_tx_descriptor *tx, | |
666 | int index) | |
667 | { | |
668 | struct iop_adma_desc_slot *sw_desc = tx_to_iop_adma_slot(tx); | |
669 | struct iop_adma_desc_slot *grp_start = sw_desc->group_head; | |
670 | ||
671 | iop_desc_set_zero_sum_src_addr(grp_start, index, addr); | |
672 | } | |
673 | ||
674 | static struct dma_async_tx_descriptor * | |
675 | iop_adma_prep_dma_zero_sum(struct dma_chan *chan, unsigned int src_cnt, | |
676 | size_t len, u32 *result, int int_en) | |
677 | { | |
678 | struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan); | |
679 | struct iop_adma_desc_slot *sw_desc, *grp_start; | |
680 | int slot_cnt, slots_per_op; | |
681 | ||
682 | if (unlikely(!len)) | |
683 | return NULL; | |
684 | ||
685 | dev_dbg(iop_chan->device->common.dev, "%s src_cnt: %d len: %u\n", | |
686 | __FUNCTION__, src_cnt, len); | |
687 | ||
688 | spin_lock_bh(&iop_chan->lock); | |
689 | slot_cnt = iop_chan_zero_sum_slot_count(len, src_cnt, &slots_per_op); | |
690 | sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op); | |
691 | if (sw_desc) { | |
692 | grp_start = sw_desc->group_head; | |
693 | iop_desc_init_zero_sum(grp_start, src_cnt, int_en); | |
694 | iop_desc_set_zero_sum_byte_count(grp_start, len); | |
695 | grp_start->xor_check_result = result; | |
696 | pr_debug("\t%s: grp_start->xor_check_result: %p\n", | |
697 | __FUNCTION__, grp_start->xor_check_result); | |
698 | sw_desc->unmap_src_cnt = src_cnt; | |
699 | sw_desc->unmap_len = len; | |
700 | sw_desc->async_tx.tx_set_src = iop_adma_xor_zero_sum_set_src; | |
701 | } | |
702 | spin_unlock_bh(&iop_chan->lock); | |
703 | ||
704 | return sw_desc ? &sw_desc->async_tx : NULL; | |
705 | } | |
706 | ||
707 | static void iop_adma_dependency_added(struct dma_chan *chan) | |
708 | { | |
709 | struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan); | |
710 | tasklet_schedule(&iop_chan->irq_tasklet); | |
711 | } | |
712 | ||
713 | static void iop_adma_free_chan_resources(struct dma_chan *chan) | |
714 | { | |
715 | struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan); | |
716 | struct iop_adma_desc_slot *iter, *_iter; | |
717 | int in_use_descs = 0; | |
718 | ||
719 | iop_adma_slot_cleanup(iop_chan); | |
720 | ||
721 | spin_lock_bh(&iop_chan->lock); | |
722 | list_for_each_entry_safe(iter, _iter, &iop_chan->chain, | |
723 | chain_node) { | |
724 | in_use_descs++; | |
725 | list_del(&iter->chain_node); | |
726 | } | |
727 | list_for_each_entry_safe_reverse( | |
728 | iter, _iter, &iop_chan->all_slots, slot_node) { | |
729 | list_del(&iter->slot_node); | |
730 | kfree(iter); | |
731 | iop_chan->slots_allocated--; | |
732 | } | |
733 | iop_chan->last_used = NULL; | |
734 | ||
735 | dev_dbg(iop_chan->device->common.dev, "%s slots_allocated %d\n", | |
736 | __FUNCTION__, iop_chan->slots_allocated); | |
737 | spin_unlock_bh(&iop_chan->lock); | |
738 | ||
739 | /* one is ok since we left it on there on purpose */ | |
740 | if (in_use_descs > 1) | |
741 | printk(KERN_ERR "IOP: Freeing %d in use descriptors!\n", | |
742 | in_use_descs - 1); | |
743 | } | |
744 | ||
745 | /** | |
746 | * iop_adma_is_complete - poll the status of an ADMA transaction | |
747 | * @chan: ADMA channel handle | |
748 | * @cookie: ADMA transaction identifier | |
749 | */ | |
750 | static enum dma_status iop_adma_is_complete(struct dma_chan *chan, | |
751 | dma_cookie_t cookie, | |
752 | dma_cookie_t *done, | |
753 | dma_cookie_t *used) | |
754 | { | |
755 | struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan); | |
756 | dma_cookie_t last_used; | |
757 | dma_cookie_t last_complete; | |
758 | enum dma_status ret; | |
759 | ||
760 | last_used = chan->cookie; | |
761 | last_complete = iop_chan->completed_cookie; | |
762 | ||
763 | if (done) | |
764 | *done = last_complete; | |
765 | if (used) | |
766 | *used = last_used; | |
767 | ||
768 | ret = dma_async_is_complete(cookie, last_complete, last_used); | |
769 | if (ret == DMA_SUCCESS) | |
770 | return ret; | |
771 | ||
772 | iop_adma_slot_cleanup(iop_chan); | |
773 | ||
774 | last_used = chan->cookie; | |
775 | last_complete = iop_chan->completed_cookie; | |
776 | ||
777 | if (done) | |
778 | *done = last_complete; | |
779 | if (used) | |
780 | *used = last_used; | |
781 | ||
782 | return dma_async_is_complete(cookie, last_complete, last_used); | |
783 | } | |
784 | ||
785 | static irqreturn_t iop_adma_eot_handler(int irq, void *data) | |
786 | { | |
787 | struct iop_adma_chan *chan = data; | |
788 | ||
789 | dev_dbg(chan->device->common.dev, "%s\n", __FUNCTION__); | |
790 | ||
791 | tasklet_schedule(&chan->irq_tasklet); | |
792 | ||
793 | iop_adma_device_clear_eot_status(chan); | |
794 | ||
795 | return IRQ_HANDLED; | |
796 | } | |
797 | ||
798 | static irqreturn_t iop_adma_eoc_handler(int irq, void *data) | |
799 | { | |
800 | struct iop_adma_chan *chan = data; | |
801 | ||
802 | dev_dbg(chan->device->common.dev, "%s\n", __FUNCTION__); | |
803 | ||
804 | tasklet_schedule(&chan->irq_tasklet); | |
805 | ||
806 | iop_adma_device_clear_eoc_status(chan); | |
807 | ||
808 | return IRQ_HANDLED; | |
809 | } | |
810 | ||
811 | static irqreturn_t iop_adma_err_handler(int irq, void *data) | |
812 | { | |
813 | struct iop_adma_chan *chan = data; | |
814 | unsigned long status = iop_chan_get_status(chan); | |
815 | ||
816 | dev_printk(KERN_ERR, chan->device->common.dev, | |
817 | "error ( %s%s%s%s%s%s%s)\n", | |
818 | iop_is_err_int_parity(status, chan) ? "int_parity " : "", | |
819 | iop_is_err_mcu_abort(status, chan) ? "mcu_abort " : "", | |
820 | iop_is_err_int_tabort(status, chan) ? "int_tabort " : "", | |
821 | iop_is_err_int_mabort(status, chan) ? "int_mabort " : "", | |
822 | iop_is_err_pci_tabort(status, chan) ? "pci_tabort " : "", | |
823 | iop_is_err_pci_mabort(status, chan) ? "pci_mabort " : "", | |
824 | iop_is_err_split_tx(status, chan) ? "split_tx " : ""); | |
825 | ||
826 | iop_adma_device_clear_err_status(chan); | |
827 | ||
828 | BUG(); | |
829 | ||
830 | return IRQ_HANDLED; | |
831 | } | |
832 | ||
833 | static void iop_adma_issue_pending(struct dma_chan *chan) | |
834 | { | |
835 | struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan); | |
836 | ||
837 | if (iop_chan->pending) { | |
838 | iop_chan->pending = 0; | |
839 | iop_chan_append(iop_chan); | |
840 | } | |
841 | } | |
842 | ||
843 | /* | |
844 | * Perform a transaction to verify the HW works. | |
845 | */ | |
846 | #define IOP_ADMA_TEST_SIZE 2000 | |
847 | ||
848 | static int __devinit iop_adma_memcpy_self_test(struct iop_adma_device *device) | |
849 | { | |
850 | int i; | |
851 | void *src, *dest; | |
852 | dma_addr_t src_dma, dest_dma; | |
853 | struct dma_chan *dma_chan; | |
854 | dma_cookie_t cookie; | |
855 | struct dma_async_tx_descriptor *tx; | |
856 | int err = 0; | |
857 | struct iop_adma_chan *iop_chan; | |
858 | ||
859 | dev_dbg(device->common.dev, "%s\n", __FUNCTION__); | |
860 | ||
861 | src = kzalloc(sizeof(u8) * IOP_ADMA_TEST_SIZE, GFP_KERNEL); | |
862 | if (!src) | |
863 | return -ENOMEM; | |
864 | dest = kzalloc(sizeof(u8) * IOP_ADMA_TEST_SIZE, GFP_KERNEL); | |
865 | if (!dest) { | |
866 | kfree(src); | |
867 | return -ENOMEM; | |
868 | } | |
869 | ||
870 | /* Fill in src buffer */ | |
871 | for (i = 0; i < IOP_ADMA_TEST_SIZE; i++) | |
872 | ((u8 *) src)[i] = (u8)i; | |
873 | ||
874 | memset(dest, 0, IOP_ADMA_TEST_SIZE); | |
875 | ||
876 | /* Start copy, using first DMA channel */ | |
877 | dma_chan = container_of(device->common.channels.next, | |
878 | struct dma_chan, | |
879 | device_node); | |
880 | if (iop_adma_alloc_chan_resources(dma_chan) < 1) { | |
881 | err = -ENODEV; | |
882 | goto out; | |
883 | } | |
884 | ||
885 | tx = iop_adma_prep_dma_memcpy(dma_chan, IOP_ADMA_TEST_SIZE, 1); | |
886 | dest_dma = dma_map_single(dma_chan->device->dev, dest, | |
887 | IOP_ADMA_TEST_SIZE, DMA_FROM_DEVICE); | |
888 | iop_adma_set_dest(dest_dma, tx, 0); | |
889 | src_dma = dma_map_single(dma_chan->device->dev, src, | |
890 | IOP_ADMA_TEST_SIZE, DMA_TO_DEVICE); | |
891 | iop_adma_memcpy_set_src(src_dma, tx, 0); | |
892 | ||
893 | cookie = iop_adma_tx_submit(tx); | |
894 | iop_adma_issue_pending(dma_chan); | |
895 | async_tx_ack(tx); | |
896 | msleep(1); | |
897 | ||
898 | if (iop_adma_is_complete(dma_chan, cookie, NULL, NULL) != | |
899 | DMA_SUCCESS) { | |
900 | dev_printk(KERN_ERR, dma_chan->device->dev, | |
901 | "Self-test copy timed out, disabling\n"); | |
902 | err = -ENODEV; | |
903 | goto free_resources; | |
904 | } | |
905 | ||
906 | iop_chan = to_iop_adma_chan(dma_chan); | |
907 | dma_sync_single_for_cpu(&iop_chan->device->pdev->dev, dest_dma, | |
908 | IOP_ADMA_TEST_SIZE, DMA_FROM_DEVICE); | |
909 | if (memcmp(src, dest, IOP_ADMA_TEST_SIZE)) { | |
910 | dev_printk(KERN_ERR, dma_chan->device->dev, | |
911 | "Self-test copy failed compare, disabling\n"); | |
912 | err = -ENODEV; | |
913 | goto free_resources; | |
914 | } | |
915 | ||
916 | free_resources: | |
917 | iop_adma_free_chan_resources(dma_chan); | |
918 | out: | |
919 | kfree(src); | |
920 | kfree(dest); | |
921 | return err; | |
922 | } | |
923 | ||
924 | #define IOP_ADMA_NUM_SRC_TEST 4 /* must be <= 15 */ | |
925 | static int __devinit | |
926 | iop_adma_xor_zero_sum_self_test(struct iop_adma_device *device) | |
927 | { | |
928 | int i, src_idx; | |
929 | struct page *dest; | |
930 | struct page *xor_srcs[IOP_ADMA_NUM_SRC_TEST]; | |
931 | struct page *zero_sum_srcs[IOP_ADMA_NUM_SRC_TEST + 1]; | |
932 | dma_addr_t dma_addr, dest_dma; | |
933 | struct dma_async_tx_descriptor *tx; | |
934 | struct dma_chan *dma_chan; | |
935 | dma_cookie_t cookie; | |
936 | u8 cmp_byte = 0; | |
937 | u32 cmp_word; | |
938 | u32 zero_sum_result; | |
939 | int err = 0; | |
940 | struct iop_adma_chan *iop_chan; | |
941 | ||
942 | dev_dbg(device->common.dev, "%s\n", __FUNCTION__); | |
943 | ||
944 | for (src_idx = 0; src_idx < IOP_ADMA_NUM_SRC_TEST; src_idx++) { | |
945 | xor_srcs[src_idx] = alloc_page(GFP_KERNEL); | |
946 | if (!xor_srcs[src_idx]) | |
947 | while (src_idx--) { | |
948 | __free_page(xor_srcs[src_idx]); | |
949 | return -ENOMEM; | |
950 | } | |
951 | } | |
952 | ||
953 | dest = alloc_page(GFP_KERNEL); | |
954 | if (!dest) | |
955 | while (src_idx--) { | |
956 | __free_page(xor_srcs[src_idx]); | |
957 | return -ENOMEM; | |
958 | } | |
959 | ||
960 | /* Fill in src buffers */ | |
961 | for (src_idx = 0; src_idx < IOP_ADMA_NUM_SRC_TEST; src_idx++) { | |
962 | u8 *ptr = page_address(xor_srcs[src_idx]); | |
963 | for (i = 0; i < PAGE_SIZE; i++) | |
964 | ptr[i] = (1 << src_idx); | |
965 | } | |
966 | ||
967 | for (src_idx = 0; src_idx < IOP_ADMA_NUM_SRC_TEST; src_idx++) | |
968 | cmp_byte ^= (u8) (1 << src_idx); | |
969 | ||
970 | cmp_word = (cmp_byte << 24) | (cmp_byte << 16) | | |
971 | (cmp_byte << 8) | cmp_byte; | |
972 | ||
973 | memset(page_address(dest), 0, PAGE_SIZE); | |
974 | ||
975 | dma_chan = container_of(device->common.channels.next, | |
976 | struct dma_chan, | |
977 | device_node); | |
978 | if (iop_adma_alloc_chan_resources(dma_chan) < 1) { | |
979 | err = -ENODEV; | |
980 | goto out; | |
981 | } | |
982 | ||
983 | /* test xor */ | |
984 | tx = iop_adma_prep_dma_xor(dma_chan, IOP_ADMA_NUM_SRC_TEST, | |
985 | PAGE_SIZE, 1); | |
986 | dest_dma = dma_map_page(dma_chan->device->dev, dest, 0, | |
987 | PAGE_SIZE, DMA_FROM_DEVICE); | |
988 | iop_adma_set_dest(dest_dma, tx, 0); | |
989 | ||
990 | for (i = 0; i < IOP_ADMA_NUM_SRC_TEST; i++) { | |
991 | dma_addr = dma_map_page(dma_chan->device->dev, xor_srcs[i], 0, | |
992 | PAGE_SIZE, DMA_TO_DEVICE); | |
993 | iop_adma_xor_set_src(dma_addr, tx, i); | |
994 | } | |
995 | ||
996 | cookie = iop_adma_tx_submit(tx); | |
997 | iop_adma_issue_pending(dma_chan); | |
998 | async_tx_ack(tx); | |
999 | msleep(8); | |
1000 | ||
1001 | if (iop_adma_is_complete(dma_chan, cookie, NULL, NULL) != | |
1002 | DMA_SUCCESS) { | |
1003 | dev_printk(KERN_ERR, dma_chan->device->dev, | |
1004 | "Self-test xor timed out, disabling\n"); | |
1005 | err = -ENODEV; | |
1006 | goto free_resources; | |
1007 | } | |
1008 | ||
1009 | iop_chan = to_iop_adma_chan(dma_chan); | |
1010 | dma_sync_single_for_cpu(&iop_chan->device->pdev->dev, dest_dma, | |
1011 | PAGE_SIZE, DMA_FROM_DEVICE); | |
1012 | for (i = 0; i < (PAGE_SIZE / sizeof(u32)); i++) { | |
1013 | u32 *ptr = page_address(dest); | |
1014 | if (ptr[i] != cmp_word) { | |
1015 | dev_printk(KERN_ERR, dma_chan->device->dev, | |
1016 | "Self-test xor failed compare, disabling\n"); | |
1017 | err = -ENODEV; | |
1018 | goto free_resources; | |
1019 | } | |
1020 | } | |
1021 | dma_sync_single_for_device(&iop_chan->device->pdev->dev, dest_dma, | |
1022 | PAGE_SIZE, DMA_TO_DEVICE); | |
1023 | ||
1024 | /* skip zero sum if the capability is not present */ | |
1025 | if (!dma_has_cap(DMA_ZERO_SUM, dma_chan->device->cap_mask)) | |
1026 | goto free_resources; | |
1027 | ||
1028 | /* zero sum the sources with the destintation page */ | |
1029 | for (i = 0; i < IOP_ADMA_NUM_SRC_TEST; i++) | |
1030 | zero_sum_srcs[i] = xor_srcs[i]; | |
1031 | zero_sum_srcs[i] = dest; | |
1032 | ||
1033 | zero_sum_result = 1; | |
1034 | ||
1035 | tx = iop_adma_prep_dma_zero_sum(dma_chan, IOP_ADMA_NUM_SRC_TEST + 1, | |
1036 | PAGE_SIZE, &zero_sum_result, 1); | |
1037 | for (i = 0; i < IOP_ADMA_NUM_SRC_TEST + 1; i++) { | |
1038 | dma_addr = dma_map_page(dma_chan->device->dev, zero_sum_srcs[i], | |
1039 | 0, PAGE_SIZE, DMA_TO_DEVICE); | |
1040 | iop_adma_xor_zero_sum_set_src(dma_addr, tx, i); | |
1041 | } | |
1042 | ||
1043 | cookie = iop_adma_tx_submit(tx); | |
1044 | iop_adma_issue_pending(dma_chan); | |
1045 | async_tx_ack(tx); | |
1046 | msleep(8); | |
1047 | ||
1048 | if (iop_adma_is_complete(dma_chan, cookie, NULL, NULL) != DMA_SUCCESS) { | |
1049 | dev_printk(KERN_ERR, dma_chan->device->dev, | |
1050 | "Self-test zero sum timed out, disabling\n"); | |
1051 | err = -ENODEV; | |
1052 | goto free_resources; | |
1053 | } | |
1054 | ||
1055 | if (zero_sum_result != 0) { | |
1056 | dev_printk(KERN_ERR, dma_chan->device->dev, | |
1057 | "Self-test zero sum failed compare, disabling\n"); | |
1058 | err = -ENODEV; | |
1059 | goto free_resources; | |
1060 | } | |
1061 | ||
1062 | /* test memset */ | |
1063 | tx = iop_adma_prep_dma_memset(dma_chan, 0, PAGE_SIZE, 1); | |
1064 | dma_addr = dma_map_page(dma_chan->device->dev, dest, 0, | |
1065 | PAGE_SIZE, DMA_FROM_DEVICE); | |
1066 | iop_adma_set_dest(dma_addr, tx, 0); | |
1067 | ||
1068 | cookie = iop_adma_tx_submit(tx); | |
1069 | iop_adma_issue_pending(dma_chan); | |
1070 | async_tx_ack(tx); | |
1071 | msleep(8); | |
1072 | ||
1073 | if (iop_adma_is_complete(dma_chan, cookie, NULL, NULL) != DMA_SUCCESS) { | |
1074 | dev_printk(KERN_ERR, dma_chan->device->dev, | |
1075 | "Self-test memset timed out, disabling\n"); | |
1076 | err = -ENODEV; | |
1077 | goto free_resources; | |
1078 | } | |
1079 | ||
1080 | for (i = 0; i < PAGE_SIZE/sizeof(u32); i++) { | |
1081 | u32 *ptr = page_address(dest); | |
1082 | if (ptr[i]) { | |
1083 | dev_printk(KERN_ERR, dma_chan->device->dev, | |
1084 | "Self-test memset failed compare, disabling\n"); | |
1085 | err = -ENODEV; | |
1086 | goto free_resources; | |
1087 | } | |
1088 | } | |
1089 | ||
1090 | /* test for non-zero parity sum */ | |
1091 | zero_sum_result = 0; | |
1092 | tx = iop_adma_prep_dma_zero_sum(dma_chan, IOP_ADMA_NUM_SRC_TEST + 1, | |
1093 | PAGE_SIZE, &zero_sum_result, 1); | |
1094 | for (i = 0; i < IOP_ADMA_NUM_SRC_TEST + 1; i++) { | |
1095 | dma_addr = dma_map_page(dma_chan->device->dev, zero_sum_srcs[i], | |
1096 | 0, PAGE_SIZE, DMA_TO_DEVICE); | |
1097 | iop_adma_xor_zero_sum_set_src(dma_addr, tx, i); | |
1098 | } | |
1099 | ||
1100 | cookie = iop_adma_tx_submit(tx); | |
1101 | iop_adma_issue_pending(dma_chan); | |
1102 | async_tx_ack(tx); | |
1103 | msleep(8); | |
1104 | ||
1105 | if (iop_adma_is_complete(dma_chan, cookie, NULL, NULL) != DMA_SUCCESS) { | |
1106 | dev_printk(KERN_ERR, dma_chan->device->dev, | |
1107 | "Self-test non-zero sum timed out, disabling\n"); | |
1108 | err = -ENODEV; | |
1109 | goto free_resources; | |
1110 | } | |
1111 | ||
1112 | if (zero_sum_result != 1) { | |
1113 | dev_printk(KERN_ERR, dma_chan->device->dev, | |
1114 | "Self-test non-zero sum failed compare, disabling\n"); | |
1115 | err = -ENODEV; | |
1116 | goto free_resources; | |
1117 | } | |
1118 | ||
1119 | free_resources: | |
1120 | iop_adma_free_chan_resources(dma_chan); | |
1121 | out: | |
1122 | src_idx = IOP_ADMA_NUM_SRC_TEST; | |
1123 | while (src_idx--) | |
1124 | __free_page(xor_srcs[src_idx]); | |
1125 | __free_page(dest); | |
1126 | return err; | |
1127 | } | |
1128 | ||
1129 | static int __devexit iop_adma_remove(struct platform_device *dev) | |
1130 | { | |
1131 | struct iop_adma_device *device = platform_get_drvdata(dev); | |
1132 | struct dma_chan *chan, *_chan; | |
1133 | struct iop_adma_chan *iop_chan; | |
1134 | int i; | |
1135 | struct iop_adma_platform_data *plat_data = dev->dev.platform_data; | |
1136 | ||
1137 | dma_async_device_unregister(&device->common); | |
1138 | ||
1139 | for (i = 0; i < 3; i++) { | |
1140 | unsigned int irq; | |
1141 | irq = platform_get_irq(dev, i); | |
1142 | free_irq(irq, device); | |
1143 | } | |
1144 | ||
1145 | dma_free_coherent(&dev->dev, plat_data->pool_size, | |
1146 | device->dma_desc_pool_virt, device->dma_desc_pool); | |
1147 | ||
1148 | do { | |
1149 | struct resource *res; | |
1150 | res = platform_get_resource(dev, IORESOURCE_MEM, 0); | |
1151 | release_mem_region(res->start, res->end - res->start); | |
1152 | } while (0); | |
1153 | ||
1154 | list_for_each_entry_safe(chan, _chan, &device->common.channels, | |
1155 | device_node) { | |
1156 | iop_chan = to_iop_adma_chan(chan); | |
1157 | list_del(&chan->device_node); | |
1158 | kfree(iop_chan); | |
1159 | } | |
1160 | kfree(device); | |
1161 | ||
1162 | return 0; | |
1163 | } | |
1164 | ||
1165 | static int __devinit iop_adma_probe(struct platform_device *pdev) | |
1166 | { | |
1167 | struct resource *res; | |
1168 | int ret = 0, i; | |
1169 | struct iop_adma_device *adev; | |
1170 | struct iop_adma_chan *iop_chan; | |
1171 | struct dma_device *dma_dev; | |
1172 | struct iop_adma_platform_data *plat_data = pdev->dev.platform_data; | |
1173 | ||
1174 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
1175 | if (!res) | |
1176 | return -ENODEV; | |
1177 | ||
1178 | if (!devm_request_mem_region(&pdev->dev, res->start, | |
1179 | res->end - res->start, pdev->name)) | |
1180 | return -EBUSY; | |
1181 | ||
1182 | adev = kzalloc(sizeof(*adev), GFP_KERNEL); | |
1183 | if (!adev) | |
1184 | return -ENOMEM; | |
1185 | dma_dev = &adev->common; | |
1186 | ||
1187 | /* allocate coherent memory for hardware descriptors | |
1188 | * note: writecombine gives slightly better performance, but | |
1189 | * requires that we explicitly flush the writes | |
1190 | */ | |
1191 | if ((adev->dma_desc_pool_virt = dma_alloc_writecombine(&pdev->dev, | |
1192 | plat_data->pool_size, | |
1193 | &adev->dma_desc_pool, | |
1194 | GFP_KERNEL)) == NULL) { | |
1195 | ret = -ENOMEM; | |
1196 | goto err_free_adev; | |
1197 | } | |
1198 | ||
1199 | dev_dbg(&pdev->dev, "%s: allocted descriptor pool virt %p phys %p\n", | |
1200 | __FUNCTION__, adev->dma_desc_pool_virt, | |
1201 | (void *) adev->dma_desc_pool); | |
1202 | ||
1203 | adev->id = plat_data->hw_id; | |
1204 | ||
1205 | /* discover transaction capabilites from the platform data */ | |
1206 | dma_dev->cap_mask = plat_data->cap_mask; | |
1207 | ||
1208 | adev->pdev = pdev; | |
1209 | platform_set_drvdata(pdev, adev); | |
1210 | ||
1211 | INIT_LIST_HEAD(&dma_dev->channels); | |
1212 | ||
1213 | /* set base routines */ | |
1214 | dma_dev->device_alloc_chan_resources = iop_adma_alloc_chan_resources; | |
1215 | dma_dev->device_free_chan_resources = iop_adma_free_chan_resources; | |
1216 | dma_dev->device_is_tx_complete = iop_adma_is_complete; | |
1217 | dma_dev->device_issue_pending = iop_adma_issue_pending; | |
1218 | dma_dev->device_dependency_added = iop_adma_dependency_added; | |
1219 | dma_dev->dev = &pdev->dev; | |
1220 | ||
1221 | /* set prep routines based on capability */ | |
1222 | if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask)) | |
1223 | dma_dev->device_prep_dma_memcpy = iop_adma_prep_dma_memcpy; | |
1224 | if (dma_has_cap(DMA_MEMSET, dma_dev->cap_mask)) | |
1225 | dma_dev->device_prep_dma_memset = iop_adma_prep_dma_memset; | |
1226 | if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) { | |
1227 | dma_dev->max_xor = iop_adma_get_max_xor(); | |
1228 | dma_dev->device_prep_dma_xor = iop_adma_prep_dma_xor; | |
1229 | } | |
1230 | if (dma_has_cap(DMA_ZERO_SUM, dma_dev->cap_mask)) | |
1231 | dma_dev->device_prep_dma_zero_sum = | |
1232 | iop_adma_prep_dma_zero_sum; | |
1233 | if (dma_has_cap(DMA_INTERRUPT, dma_dev->cap_mask)) | |
1234 | dma_dev->device_prep_dma_interrupt = | |
1235 | iop_adma_prep_dma_interrupt; | |
1236 | ||
1237 | iop_chan = kzalloc(sizeof(*iop_chan), GFP_KERNEL); | |
1238 | if (!iop_chan) { | |
1239 | ret = -ENOMEM; | |
1240 | goto err_free_dma; | |
1241 | } | |
1242 | iop_chan->device = adev; | |
1243 | ||
1244 | iop_chan->mmr_base = devm_ioremap(&pdev->dev, res->start, | |
1245 | res->end - res->start); | |
1246 | if (!iop_chan->mmr_base) { | |
1247 | ret = -ENOMEM; | |
1248 | goto err_free_iop_chan; | |
1249 | } | |
1250 | tasklet_init(&iop_chan->irq_tasklet, iop_adma_tasklet, (unsigned long) | |
1251 | iop_chan); | |
1252 | ||
1253 | /* clear errors before enabling interrupts */ | |
1254 | iop_adma_device_clear_err_status(iop_chan); | |
1255 | ||
1256 | for (i = 0; i < 3; i++) { | |
1257 | irq_handler_t handler[] = { iop_adma_eot_handler, | |
1258 | iop_adma_eoc_handler, | |
1259 | iop_adma_err_handler }; | |
1260 | int irq = platform_get_irq(pdev, i); | |
1261 | if (irq < 0) { | |
1262 | ret = -ENXIO; | |
1263 | goto err_free_iop_chan; | |
1264 | } else { | |
1265 | ret = devm_request_irq(&pdev->dev, irq, | |
1266 | handler[i], 0, pdev->name, iop_chan); | |
1267 | if (ret) | |
1268 | goto err_free_iop_chan; | |
1269 | } | |
1270 | } | |
1271 | ||
1272 | spin_lock_init(&iop_chan->lock); | |
1273 | init_timer(&iop_chan->cleanup_watchdog); | |
1274 | iop_chan->cleanup_watchdog.data = (unsigned long) iop_chan; | |
1275 | iop_chan->cleanup_watchdog.function = iop_adma_tasklet; | |
1276 | INIT_LIST_HEAD(&iop_chan->chain); | |
1277 | INIT_LIST_HEAD(&iop_chan->all_slots); | |
1278 | INIT_RCU_HEAD(&iop_chan->common.rcu); | |
1279 | iop_chan->common.device = dma_dev; | |
1280 | list_add_tail(&iop_chan->common.device_node, &dma_dev->channels); | |
1281 | ||
1282 | if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask)) { | |
1283 | ret = iop_adma_memcpy_self_test(adev); | |
1284 | dev_dbg(&pdev->dev, "memcpy self test returned %d\n", ret); | |
1285 | if (ret) | |
1286 | goto err_free_iop_chan; | |
1287 | } | |
1288 | ||
1289 | if (dma_has_cap(DMA_XOR, dma_dev->cap_mask) || | |
1290 | dma_has_cap(DMA_MEMSET, dma_dev->cap_mask)) { | |
1291 | ret = iop_adma_xor_zero_sum_self_test(adev); | |
1292 | dev_dbg(&pdev->dev, "xor self test returned %d\n", ret); | |
1293 | if (ret) | |
1294 | goto err_free_iop_chan; | |
1295 | } | |
1296 | ||
1297 | dev_printk(KERN_INFO, &pdev->dev, "Intel(R) IOP: " | |
1298 | "( %s%s%s%s%s%s%s%s%s%s)\n", | |
1299 | dma_has_cap(DMA_PQ_XOR, dma_dev->cap_mask) ? "pq_xor " : "", | |
1300 | dma_has_cap(DMA_PQ_UPDATE, dma_dev->cap_mask) ? "pq_update " : "", | |
1301 | dma_has_cap(DMA_PQ_ZERO_SUM, dma_dev->cap_mask) ? "pq_zero_sum " : "", | |
1302 | dma_has_cap(DMA_XOR, dma_dev->cap_mask) ? "xor " : "", | |
1303 | dma_has_cap(DMA_DUAL_XOR, dma_dev->cap_mask) ? "dual_xor " : "", | |
1304 | dma_has_cap(DMA_ZERO_SUM, dma_dev->cap_mask) ? "xor_zero_sum " : "", | |
1305 | dma_has_cap(DMA_MEMSET, dma_dev->cap_mask) ? "fill " : "", | |
1306 | dma_has_cap(DMA_MEMCPY_CRC32C, dma_dev->cap_mask) ? "cpy+crc " : "", | |
1307 | dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask) ? "cpy " : "", | |
1308 | dma_has_cap(DMA_INTERRUPT, dma_dev->cap_mask) ? "intr " : ""); | |
1309 | ||
1310 | dma_async_device_register(dma_dev); | |
1311 | goto out; | |
1312 | ||
1313 | err_free_iop_chan: | |
1314 | kfree(iop_chan); | |
1315 | err_free_dma: | |
1316 | dma_free_coherent(&adev->pdev->dev, plat_data->pool_size, | |
1317 | adev->dma_desc_pool_virt, adev->dma_desc_pool); | |
1318 | err_free_adev: | |
1319 | kfree(adev); | |
1320 | out: | |
1321 | return ret; | |
1322 | } | |
1323 | ||
1324 | static void iop_chan_start_null_memcpy(struct iop_adma_chan *iop_chan) | |
1325 | { | |
1326 | struct iop_adma_desc_slot *sw_desc, *grp_start; | |
1327 | dma_cookie_t cookie; | |
1328 | int slot_cnt, slots_per_op; | |
1329 | ||
1330 | dev_dbg(iop_chan->device->common.dev, "%s\n", __FUNCTION__); | |
1331 | ||
1332 | spin_lock_bh(&iop_chan->lock); | |
1333 | slot_cnt = iop_chan_memcpy_slot_count(0, &slots_per_op); | |
1334 | sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op); | |
1335 | if (sw_desc) { | |
1336 | grp_start = sw_desc->group_head; | |
1337 | ||
1338 | list_splice_init(&sw_desc->async_tx.tx_list, &iop_chan->chain); | |
1339 | sw_desc->async_tx.ack = 1; | |
1340 | iop_desc_init_memcpy(grp_start, 0); | |
1341 | iop_desc_set_byte_count(grp_start, iop_chan, 0); | |
1342 | iop_desc_set_dest_addr(grp_start, iop_chan, 0); | |
1343 | iop_desc_set_memcpy_src_addr(grp_start, 0); | |
1344 | ||
1345 | cookie = iop_chan->common.cookie; | |
1346 | cookie++; | |
1347 | if (cookie <= 1) | |
1348 | cookie = 2; | |
1349 | ||
1350 | /* initialize the completed cookie to be less than | |
1351 | * the most recently used cookie | |
1352 | */ | |
1353 | iop_chan->completed_cookie = cookie - 1; | |
1354 | iop_chan->common.cookie = sw_desc->async_tx.cookie = cookie; | |
1355 | ||
1356 | /* channel should not be busy */ | |
1357 | BUG_ON(iop_chan_is_busy(iop_chan)); | |
1358 | ||
1359 | /* clear any prior error-status bits */ | |
1360 | iop_adma_device_clear_err_status(iop_chan); | |
1361 | ||
1362 | /* disable operation */ | |
1363 | iop_chan_disable(iop_chan); | |
1364 | ||
1365 | /* set the descriptor address */ | |
1366 | iop_chan_set_next_descriptor(iop_chan, sw_desc->async_tx.phys); | |
1367 | ||
1368 | /* 1/ don't add pre-chained descriptors | |
1369 | * 2/ dummy read to flush next_desc write | |
1370 | */ | |
1371 | BUG_ON(iop_desc_get_next_desc(sw_desc)); | |
1372 | ||
1373 | /* run the descriptor */ | |
1374 | iop_chan_enable(iop_chan); | |
1375 | } else | |
1376 | dev_printk(KERN_ERR, iop_chan->device->common.dev, | |
1377 | "failed to allocate null descriptor\n"); | |
1378 | spin_unlock_bh(&iop_chan->lock); | |
1379 | } | |
1380 | ||
1381 | static void iop_chan_start_null_xor(struct iop_adma_chan *iop_chan) | |
1382 | { | |
1383 | struct iop_adma_desc_slot *sw_desc, *grp_start; | |
1384 | dma_cookie_t cookie; | |
1385 | int slot_cnt, slots_per_op; | |
1386 | ||
1387 | dev_dbg(iop_chan->device->common.dev, "%s\n", __FUNCTION__); | |
1388 | ||
1389 | spin_lock_bh(&iop_chan->lock); | |
1390 | slot_cnt = iop_chan_xor_slot_count(0, 2, &slots_per_op); | |
1391 | sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op); | |
1392 | if (sw_desc) { | |
1393 | grp_start = sw_desc->group_head; | |
1394 | list_splice_init(&sw_desc->async_tx.tx_list, &iop_chan->chain); | |
1395 | sw_desc->async_tx.ack = 1; | |
1396 | iop_desc_init_null_xor(grp_start, 2, 0); | |
1397 | iop_desc_set_byte_count(grp_start, iop_chan, 0); | |
1398 | iop_desc_set_dest_addr(grp_start, iop_chan, 0); | |
1399 | iop_desc_set_xor_src_addr(grp_start, 0, 0); | |
1400 | iop_desc_set_xor_src_addr(grp_start, 1, 0); | |
1401 | ||
1402 | cookie = iop_chan->common.cookie; | |
1403 | cookie++; | |
1404 | if (cookie <= 1) | |
1405 | cookie = 2; | |
1406 | ||
1407 | /* initialize the completed cookie to be less than | |
1408 | * the most recently used cookie | |
1409 | */ | |
1410 | iop_chan->completed_cookie = cookie - 1; | |
1411 | iop_chan->common.cookie = sw_desc->async_tx.cookie = cookie; | |
1412 | ||
1413 | /* channel should not be busy */ | |
1414 | BUG_ON(iop_chan_is_busy(iop_chan)); | |
1415 | ||
1416 | /* clear any prior error-status bits */ | |
1417 | iop_adma_device_clear_err_status(iop_chan); | |
1418 | ||
1419 | /* disable operation */ | |
1420 | iop_chan_disable(iop_chan); | |
1421 | ||
1422 | /* set the descriptor address */ | |
1423 | iop_chan_set_next_descriptor(iop_chan, sw_desc->async_tx.phys); | |
1424 | ||
1425 | /* 1/ don't add pre-chained descriptors | |
1426 | * 2/ dummy read to flush next_desc write | |
1427 | */ | |
1428 | BUG_ON(iop_desc_get_next_desc(sw_desc)); | |
1429 | ||
1430 | /* run the descriptor */ | |
1431 | iop_chan_enable(iop_chan); | |
1432 | } else | |
1433 | dev_printk(KERN_ERR, iop_chan->device->common.dev, | |
1434 | "failed to allocate null descriptor\n"); | |
1435 | spin_unlock_bh(&iop_chan->lock); | |
1436 | } | |
1437 | ||
1438 | static struct platform_driver iop_adma_driver = { | |
1439 | .probe = iop_adma_probe, | |
1440 | .remove = iop_adma_remove, | |
1441 | .driver = { | |
1442 | .owner = THIS_MODULE, | |
1443 | .name = "iop-adma", | |
1444 | }, | |
1445 | }; | |
1446 | ||
1447 | static int __init iop_adma_init (void) | |
1448 | { | |
1449 | /* it's currently unsafe to unload this module */ | |
1450 | /* if forced, worst case is that rmmod hangs */ | |
1451 | __unsafe(THIS_MODULE); | |
1452 | ||
1453 | return platform_driver_register(&iop_adma_driver); | |
1454 | } | |
1455 | ||
1456 | static void __exit iop_adma_exit (void) | |
1457 | { | |
1458 | platform_driver_unregister(&iop_adma_driver); | |
1459 | return; | |
1460 | } | |
1461 | ||
1462 | module_init(iop_adma_init); | |
1463 | module_exit(iop_adma_exit); | |
1464 | ||
1465 | MODULE_AUTHOR("Intel Corporation"); | |
1466 | MODULE_DESCRIPTION("IOP ADMA Engine Driver"); | |
1467 | MODULE_LICENSE("GPL"); |