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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); | |
c2110923 DW |
66 | if (desc->async_tx.cookie > 0) { |
67 | cookie = desc->async_tx.cookie; | |
68 | desc->async_tx.cookie = 0; | |
69 | ||
70 | /* call the callback (must not sleep or submit new | |
71 | * operations to this channel) | |
72 | */ | |
73 | if (desc->async_tx.callback) | |
74 | desc->async_tx.callback( | |
75 | desc->async_tx.callback_param); | |
76 | ||
77 | /* unmap dma addresses | |
78 | * (unmap_single vs unmap_page?) | |
79 | */ | |
80 | if (desc->group_head && desc->unmap_len) { | |
81 | struct iop_adma_desc_slot *unmap = desc->group_head; | |
82 | struct device *dev = | |
83 | &iop_chan->device->pdev->dev; | |
84 | u32 len = unmap->unmap_len; | |
85 | u32 src_cnt = unmap->unmap_src_cnt; | |
86 | dma_addr_t addr = iop_desc_get_dest_addr(unmap, | |
87 | iop_chan); | |
88 | ||
89 | dma_unmap_page(dev, addr, len, DMA_FROM_DEVICE); | |
90 | while (src_cnt--) { | |
91 | addr = iop_desc_get_src_addr(unmap, | |
92 | iop_chan, | |
93 | src_cnt); | |
94 | dma_unmap_page(dev, addr, len, | |
95 | DMA_TO_DEVICE); | |
96 | } | |
97 | desc->group_head = NULL; | |
98 | } | |
99 | } | |
100 | ||
101 | /* run dependent operations */ | |
102 | async_tx_run_dependencies(&desc->async_tx); | |
c2110923 DW |
103 | |
104 | return cookie; | |
105 | } | |
106 | ||
107 | static int | |
108 | iop_adma_clean_slot(struct iop_adma_desc_slot *desc, | |
109 | struct iop_adma_chan *iop_chan) | |
110 | { | |
111 | /* the client is allowed to attach dependent operations | |
112 | * until 'ack' is set | |
113 | */ | |
636bdeaa | 114 | if (!async_tx_test_ack(&desc->async_tx)) |
c2110923 DW |
115 | return 0; |
116 | ||
117 | /* leave the last descriptor in the chain | |
118 | * so we can append to it | |
119 | */ | |
120 | if (desc->chain_node.next == &iop_chan->chain) | |
121 | return 1; | |
122 | ||
123 | dev_dbg(iop_chan->device->common.dev, | |
124 | "\tfree slot: %d slots_per_op: %d\n", | |
125 | desc->idx, desc->slots_per_op); | |
126 | ||
127 | list_del(&desc->chain_node); | |
128 | iop_adma_free_slots(desc); | |
129 | ||
130 | return 0; | |
131 | } | |
132 | ||
133 | static void __iop_adma_slot_cleanup(struct iop_adma_chan *iop_chan) | |
134 | { | |
135 | struct iop_adma_desc_slot *iter, *_iter, *grp_start = NULL; | |
136 | dma_cookie_t cookie = 0; | |
137 | u32 current_desc = iop_chan_get_current_descriptor(iop_chan); | |
138 | int busy = iop_chan_is_busy(iop_chan); | |
139 | int seen_current = 0, slot_cnt = 0, slots_per_op = 0; | |
140 | ||
3d9b525b | 141 | dev_dbg(iop_chan->device->common.dev, "%s\n", __func__); |
c2110923 DW |
142 | /* free completed slots from the chain starting with |
143 | * the oldest descriptor | |
144 | */ | |
145 | list_for_each_entry_safe(iter, _iter, &iop_chan->chain, | |
146 | chain_node) { | |
147 | pr_debug("\tcookie: %d slot: %d busy: %d " | |
148 | "this_desc: %#x next_desc: %#x ack: %d\n", | |
149 | iter->async_tx.cookie, iter->idx, busy, | |
150 | iter->async_tx.phys, iop_desc_get_next_desc(iter), | |
636bdeaa | 151 | async_tx_test_ack(&iter->async_tx)); |
c2110923 DW |
152 | prefetch(_iter); |
153 | prefetch(&_iter->async_tx); | |
154 | ||
155 | /* do not advance past the current descriptor loaded into the | |
156 | * hardware channel, subsequent descriptors are either in | |
157 | * process or have not been submitted | |
158 | */ | |
159 | if (seen_current) | |
160 | break; | |
161 | ||
162 | /* stop the search if we reach the current descriptor and the | |
163 | * channel is busy, or if it appears that the current descriptor | |
164 | * needs to be re-read (i.e. has been appended to) | |
165 | */ | |
166 | if (iter->async_tx.phys == current_desc) { | |
167 | BUG_ON(seen_current++); | |
168 | if (busy || iop_desc_get_next_desc(iter)) | |
169 | break; | |
170 | } | |
171 | ||
172 | /* detect the start of a group transaction */ | |
173 | if (!slot_cnt && !slots_per_op) { | |
174 | slot_cnt = iter->slot_cnt; | |
175 | slots_per_op = iter->slots_per_op; | |
176 | if (slot_cnt <= slots_per_op) { | |
177 | slot_cnt = 0; | |
178 | slots_per_op = 0; | |
179 | } | |
180 | } | |
181 | ||
182 | if (slot_cnt) { | |
183 | pr_debug("\tgroup++\n"); | |
184 | if (!grp_start) | |
185 | grp_start = iter; | |
186 | slot_cnt -= slots_per_op; | |
187 | } | |
188 | ||
189 | /* all the members of a group are complete */ | |
190 | if (slots_per_op != 0 && slot_cnt == 0) { | |
191 | struct iop_adma_desc_slot *grp_iter, *_grp_iter; | |
192 | int end_of_chain = 0; | |
193 | pr_debug("\tgroup end\n"); | |
194 | ||
195 | /* collect the total results */ | |
196 | if (grp_start->xor_check_result) { | |
197 | u32 zero_sum_result = 0; | |
198 | slot_cnt = grp_start->slot_cnt; | |
199 | grp_iter = grp_start; | |
200 | ||
201 | list_for_each_entry_from(grp_iter, | |
202 | &iop_chan->chain, chain_node) { | |
203 | zero_sum_result |= | |
204 | iop_desc_get_zero_result(grp_iter); | |
205 | pr_debug("\titer%d result: %d\n", | |
206 | grp_iter->idx, zero_sum_result); | |
207 | slot_cnt -= slots_per_op; | |
208 | if (slot_cnt == 0) | |
209 | break; | |
210 | } | |
211 | pr_debug("\tgrp_start->xor_check_result: %p\n", | |
212 | grp_start->xor_check_result); | |
213 | *grp_start->xor_check_result = zero_sum_result; | |
214 | } | |
215 | ||
216 | /* clean up the group */ | |
217 | slot_cnt = grp_start->slot_cnt; | |
218 | grp_iter = grp_start; | |
219 | list_for_each_entry_safe_from(grp_iter, _grp_iter, | |
220 | &iop_chan->chain, chain_node) { | |
221 | cookie = iop_adma_run_tx_complete_actions( | |
222 | grp_iter, iop_chan, cookie); | |
223 | ||
224 | slot_cnt -= slots_per_op; | |
225 | end_of_chain = iop_adma_clean_slot(grp_iter, | |
226 | iop_chan); | |
227 | ||
228 | if (slot_cnt == 0 || end_of_chain) | |
229 | break; | |
230 | } | |
231 | ||
232 | /* the group should be complete at this point */ | |
233 | BUG_ON(slot_cnt); | |
234 | ||
235 | slots_per_op = 0; | |
236 | grp_start = NULL; | |
237 | if (end_of_chain) | |
238 | break; | |
239 | else | |
240 | continue; | |
241 | } else if (slots_per_op) /* wait for group completion */ | |
242 | continue; | |
243 | ||
244 | /* write back zero sum results (single descriptor case) */ | |
245 | if (iter->xor_check_result && iter->async_tx.cookie) | |
246 | *iter->xor_check_result = | |
247 | iop_desc_get_zero_result(iter); | |
248 | ||
249 | cookie = iop_adma_run_tx_complete_actions( | |
250 | iter, iop_chan, cookie); | |
251 | ||
252 | if (iop_adma_clean_slot(iter, iop_chan)) | |
253 | break; | |
254 | } | |
255 | ||
256 | BUG_ON(!seen_current); | |
257 | ||
c2110923 DW |
258 | if (cookie > 0) { |
259 | iop_chan->completed_cookie = cookie; | |
260 | pr_debug("\tcompleted cookie %d\n", cookie); | |
261 | } | |
262 | } | |
263 | ||
264 | static void | |
265 | iop_adma_slot_cleanup(struct iop_adma_chan *iop_chan) | |
266 | { | |
267 | spin_lock_bh(&iop_chan->lock); | |
268 | __iop_adma_slot_cleanup(iop_chan); | |
269 | spin_unlock_bh(&iop_chan->lock); | |
270 | } | |
271 | ||
272 | static void iop_adma_tasklet(unsigned long data) | |
273 | { | |
19242d72 DW |
274 | struct iop_adma_chan *iop_chan = (struct iop_adma_chan *) data; |
275 | ||
276 | spin_lock(&iop_chan->lock); | |
277 | __iop_adma_slot_cleanup(iop_chan); | |
278 | spin_unlock(&iop_chan->lock); | |
c2110923 DW |
279 | } |
280 | ||
281 | static struct iop_adma_desc_slot * | |
282 | iop_adma_alloc_slots(struct iop_adma_chan *iop_chan, int num_slots, | |
283 | int slots_per_op) | |
284 | { | |
285 | struct iop_adma_desc_slot *iter, *_iter, *alloc_start = NULL; | |
e73ef9ac | 286 | LIST_HEAD(chain); |
c2110923 DW |
287 | int slots_found, retry = 0; |
288 | ||
289 | /* start search from the last allocated descrtiptor | |
290 | * if a contiguous allocation can not be found start searching | |
291 | * from the beginning of the list | |
292 | */ | |
293 | retry: | |
294 | slots_found = 0; | |
295 | if (retry == 0) | |
296 | iter = iop_chan->last_used; | |
297 | else | |
298 | iter = list_entry(&iop_chan->all_slots, | |
299 | struct iop_adma_desc_slot, | |
300 | slot_node); | |
301 | ||
302 | list_for_each_entry_safe_continue( | |
303 | iter, _iter, &iop_chan->all_slots, slot_node) { | |
304 | prefetch(_iter); | |
305 | prefetch(&_iter->async_tx); | |
306 | if (iter->slots_per_op) { | |
307 | /* give up after finding the first busy slot | |
308 | * on the second pass through the list | |
309 | */ | |
310 | if (retry) | |
311 | break; | |
312 | ||
313 | slots_found = 0; | |
314 | continue; | |
315 | } | |
316 | ||
317 | /* start the allocation if the slot is correctly aligned */ | |
318 | if (!slots_found++) { | |
319 | if (iop_desc_is_aligned(iter, slots_per_op)) | |
320 | alloc_start = iter; | |
321 | else { | |
322 | slots_found = 0; | |
323 | continue; | |
324 | } | |
325 | } | |
326 | ||
327 | if (slots_found == num_slots) { | |
328 | struct iop_adma_desc_slot *alloc_tail = NULL; | |
329 | struct iop_adma_desc_slot *last_used = NULL; | |
330 | iter = alloc_start; | |
331 | while (num_slots) { | |
332 | int i; | |
333 | dev_dbg(iop_chan->device->common.dev, | |
334 | "allocated slot: %d " | |
335 | "(desc %p phys: %#x) slots_per_op %d\n", | |
336 | iter->idx, iter->hw_desc, | |
337 | iter->async_tx.phys, slots_per_op); | |
338 | ||
339 | /* pre-ack all but the last descriptor */ | |
340 | if (num_slots != slots_per_op) | |
636bdeaa | 341 | async_tx_ack(&iter->async_tx); |
c2110923 DW |
342 | |
343 | list_add_tail(&iter->chain_node, &chain); | |
344 | alloc_tail = iter; | |
345 | iter->async_tx.cookie = 0; | |
346 | iter->slot_cnt = num_slots; | |
347 | iter->xor_check_result = NULL; | |
348 | for (i = 0; i < slots_per_op; i++) { | |
349 | iter->slots_per_op = slots_per_op - i; | |
350 | last_used = iter; | |
351 | iter = list_entry(iter->slot_node.next, | |
352 | struct iop_adma_desc_slot, | |
353 | slot_node); | |
354 | } | |
355 | num_slots -= slots_per_op; | |
356 | } | |
357 | alloc_tail->group_head = alloc_start; | |
358 | alloc_tail->async_tx.cookie = -EBUSY; | |
359 | list_splice(&chain, &alloc_tail->async_tx.tx_list); | |
360 | iop_chan->last_used = last_used; | |
361 | iop_desc_clear_next_desc(alloc_start); | |
362 | iop_desc_clear_next_desc(alloc_tail); | |
363 | return alloc_tail; | |
364 | } | |
365 | } | |
366 | if (!retry++) | |
367 | goto retry; | |
368 | ||
369 | /* try to free some slots if the allocation fails */ | |
370 | tasklet_schedule(&iop_chan->irq_tasklet); | |
371 | ||
372 | return NULL; | |
373 | } | |
374 | ||
375 | static dma_cookie_t | |
376 | iop_desc_assign_cookie(struct iop_adma_chan *iop_chan, | |
377 | struct iop_adma_desc_slot *desc) | |
378 | { | |
379 | dma_cookie_t cookie = iop_chan->common.cookie; | |
380 | cookie++; | |
381 | if (cookie < 0) | |
382 | cookie = 1; | |
383 | iop_chan->common.cookie = desc->async_tx.cookie = cookie; | |
384 | return cookie; | |
385 | } | |
386 | ||
387 | static void iop_adma_check_threshold(struct iop_adma_chan *iop_chan) | |
388 | { | |
389 | dev_dbg(iop_chan->device->common.dev, "pending: %d\n", | |
390 | iop_chan->pending); | |
391 | ||
392 | if (iop_chan->pending >= IOP_ADMA_THRESHOLD) { | |
393 | iop_chan->pending = 0; | |
394 | iop_chan_append(iop_chan); | |
395 | } | |
396 | } | |
397 | ||
398 | static dma_cookie_t | |
399 | iop_adma_tx_submit(struct dma_async_tx_descriptor *tx) | |
400 | { | |
401 | struct iop_adma_desc_slot *sw_desc = tx_to_iop_adma_slot(tx); | |
402 | struct iop_adma_chan *iop_chan = to_iop_adma_chan(tx->chan); | |
403 | struct iop_adma_desc_slot *grp_start, *old_chain_tail; | |
404 | int slot_cnt; | |
405 | int slots_per_op; | |
406 | dma_cookie_t cookie; | |
407 | ||
408 | grp_start = sw_desc->group_head; | |
409 | slot_cnt = grp_start->slot_cnt; | |
410 | slots_per_op = grp_start->slots_per_op; | |
411 | ||
412 | spin_lock_bh(&iop_chan->lock); | |
413 | cookie = iop_desc_assign_cookie(iop_chan, sw_desc); | |
414 | ||
415 | old_chain_tail = list_entry(iop_chan->chain.prev, | |
416 | struct iop_adma_desc_slot, chain_node); | |
417 | list_splice_init(&sw_desc->async_tx.tx_list, | |
418 | &old_chain_tail->chain_node); | |
419 | ||
420 | /* fix up the hardware chain */ | |
421 | iop_desc_set_next_desc(old_chain_tail, grp_start->async_tx.phys); | |
422 | ||
423 | /* 1/ don't add pre-chained descriptors | |
424 | * 2/ dummy read to flush next_desc write | |
425 | */ | |
426 | BUG_ON(iop_desc_get_next_desc(sw_desc)); | |
427 | ||
428 | /* increment the pending count by the number of slots | |
429 | * memcpy operations have a 1:1 (slot:operation) relation | |
430 | * other operations are heavier and will pop the threshold | |
431 | * more often. | |
432 | */ | |
433 | iop_chan->pending += slot_cnt; | |
434 | iop_adma_check_threshold(iop_chan); | |
435 | spin_unlock_bh(&iop_chan->lock); | |
436 | ||
437 | dev_dbg(iop_chan->device->common.dev, "%s cookie: %d slot: %d\n", | |
3d9b525b | 438 | __func__, sw_desc->async_tx.cookie, sw_desc->idx); |
c2110923 DW |
439 | |
440 | return cookie; | |
441 | } | |
442 | ||
c2110923 DW |
443 | static void iop_chan_start_null_memcpy(struct iop_adma_chan *iop_chan); |
444 | static void iop_chan_start_null_xor(struct iop_adma_chan *iop_chan); | |
445 | ||
446 | /* returns the number of allocated descriptors */ | |
447 | static int iop_adma_alloc_chan_resources(struct dma_chan *chan) | |
448 | { | |
449 | char *hw_desc; | |
450 | int idx; | |
451 | struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan); | |
452 | struct iop_adma_desc_slot *slot = NULL; | |
453 | int init = iop_chan->slots_allocated ? 0 : 1; | |
454 | struct iop_adma_platform_data *plat_data = | |
455 | iop_chan->device->pdev->dev.platform_data; | |
456 | int num_descs_in_pool = plat_data->pool_size/IOP_ADMA_SLOT_SIZE; | |
457 | ||
458 | /* Allocate descriptor slots */ | |
459 | do { | |
460 | idx = iop_chan->slots_allocated; | |
461 | if (idx == num_descs_in_pool) | |
462 | break; | |
463 | ||
464 | slot = kzalloc(sizeof(*slot), GFP_KERNEL); | |
465 | if (!slot) { | |
466 | printk(KERN_INFO "IOP ADMA Channel only initialized" | |
467 | " %d descriptor slots", idx); | |
468 | break; | |
469 | } | |
470 | hw_desc = (char *) iop_chan->device->dma_desc_pool_virt; | |
471 | slot->hw_desc = (void *) &hw_desc[idx * IOP_ADMA_SLOT_SIZE]; | |
472 | ||
473 | dma_async_tx_descriptor_init(&slot->async_tx, chan); | |
474 | slot->async_tx.tx_submit = iop_adma_tx_submit; | |
c2110923 DW |
475 | INIT_LIST_HEAD(&slot->chain_node); |
476 | INIT_LIST_HEAD(&slot->slot_node); | |
477 | INIT_LIST_HEAD(&slot->async_tx.tx_list); | |
478 | hw_desc = (char *) iop_chan->device->dma_desc_pool; | |
479 | slot->async_tx.phys = | |
480 | (dma_addr_t) &hw_desc[idx * IOP_ADMA_SLOT_SIZE]; | |
481 | slot->idx = idx; | |
482 | ||
483 | spin_lock_bh(&iop_chan->lock); | |
484 | iop_chan->slots_allocated++; | |
485 | list_add_tail(&slot->slot_node, &iop_chan->all_slots); | |
486 | spin_unlock_bh(&iop_chan->lock); | |
487 | } while (iop_chan->slots_allocated < num_descs_in_pool); | |
488 | ||
489 | if (idx && !iop_chan->last_used) | |
490 | iop_chan->last_used = list_entry(iop_chan->all_slots.next, | |
491 | struct iop_adma_desc_slot, | |
492 | slot_node); | |
493 | ||
494 | dev_dbg(iop_chan->device->common.dev, | |
495 | "allocated %d descriptor slots last_used: %p\n", | |
496 | iop_chan->slots_allocated, iop_chan->last_used); | |
497 | ||
498 | /* initialize the channel and the chain with a null operation */ | |
499 | if (init) { | |
500 | if (dma_has_cap(DMA_MEMCPY, | |
501 | iop_chan->device->common.cap_mask)) | |
502 | iop_chan_start_null_memcpy(iop_chan); | |
503 | else if (dma_has_cap(DMA_XOR, | |
504 | iop_chan->device->common.cap_mask)) | |
505 | iop_chan_start_null_xor(iop_chan); | |
506 | else | |
507 | BUG(); | |
508 | } | |
509 | ||
510 | return (idx > 0) ? idx : -ENOMEM; | |
511 | } | |
512 | ||
513 | static struct dma_async_tx_descriptor * | |
636bdeaa | 514 | iop_adma_prep_dma_interrupt(struct dma_chan *chan, unsigned long flags) |
c2110923 DW |
515 | { |
516 | struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan); | |
517 | struct iop_adma_desc_slot *sw_desc, *grp_start; | |
518 | int slot_cnt, slots_per_op; | |
519 | ||
3d9b525b | 520 | dev_dbg(iop_chan->device->common.dev, "%s\n", __func__); |
c2110923 DW |
521 | |
522 | spin_lock_bh(&iop_chan->lock); | |
523 | slot_cnt = iop_chan_interrupt_slot_count(&slots_per_op, iop_chan); | |
524 | sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op); | |
525 | if (sw_desc) { | |
526 | grp_start = sw_desc->group_head; | |
527 | iop_desc_init_interrupt(grp_start, iop_chan); | |
528 | grp_start->unmap_len = 0; | |
636bdeaa | 529 | sw_desc->async_tx.flags = flags; |
c2110923 DW |
530 | } |
531 | spin_unlock_bh(&iop_chan->lock); | |
532 | ||
533 | return sw_desc ? &sw_desc->async_tx : NULL; | |
534 | } | |
535 | ||
c2110923 | 536 | static struct dma_async_tx_descriptor * |
0036731c | 537 | iop_adma_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dma_dest, |
d4c56f97 | 538 | dma_addr_t dma_src, size_t len, unsigned long flags) |
c2110923 DW |
539 | { |
540 | struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan); | |
541 | struct iop_adma_desc_slot *sw_desc, *grp_start; | |
542 | int slot_cnt, slots_per_op; | |
543 | ||
544 | if (unlikely(!len)) | |
545 | return NULL; | |
546 | BUG_ON(unlikely(len > IOP_ADMA_MAX_BYTE_COUNT)); | |
547 | ||
548 | dev_dbg(iop_chan->device->common.dev, "%s len: %u\n", | |
3d9b525b | 549 | __func__, len); |
c2110923 DW |
550 | |
551 | spin_lock_bh(&iop_chan->lock); | |
552 | slot_cnt = iop_chan_memcpy_slot_count(len, &slots_per_op); | |
553 | sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op); | |
554 | if (sw_desc) { | |
555 | grp_start = sw_desc->group_head; | |
d4c56f97 | 556 | iop_desc_init_memcpy(grp_start, flags); |
c2110923 | 557 | iop_desc_set_byte_count(grp_start, iop_chan, len); |
0036731c DW |
558 | iop_desc_set_dest_addr(grp_start, iop_chan, dma_dest); |
559 | iop_desc_set_memcpy_src_addr(grp_start, dma_src); | |
c2110923 DW |
560 | sw_desc->unmap_src_cnt = 1; |
561 | sw_desc->unmap_len = len; | |
636bdeaa | 562 | sw_desc->async_tx.flags = flags; |
c2110923 DW |
563 | } |
564 | spin_unlock_bh(&iop_chan->lock); | |
565 | ||
566 | return sw_desc ? &sw_desc->async_tx : NULL; | |
567 | } | |
568 | ||
569 | static struct dma_async_tx_descriptor * | |
0036731c | 570 | iop_adma_prep_dma_memset(struct dma_chan *chan, dma_addr_t dma_dest, |
d4c56f97 | 571 | int value, size_t len, unsigned long flags) |
c2110923 DW |
572 | { |
573 | struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan); | |
574 | struct iop_adma_desc_slot *sw_desc, *grp_start; | |
575 | int slot_cnt, slots_per_op; | |
576 | ||
577 | if (unlikely(!len)) | |
578 | return NULL; | |
579 | BUG_ON(unlikely(len > IOP_ADMA_MAX_BYTE_COUNT)); | |
580 | ||
581 | dev_dbg(iop_chan->device->common.dev, "%s len: %u\n", | |
3d9b525b | 582 | __func__, len); |
c2110923 DW |
583 | |
584 | spin_lock_bh(&iop_chan->lock); | |
585 | slot_cnt = iop_chan_memset_slot_count(len, &slots_per_op); | |
586 | sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op); | |
587 | if (sw_desc) { | |
588 | grp_start = sw_desc->group_head; | |
d4c56f97 | 589 | iop_desc_init_memset(grp_start, flags); |
c2110923 DW |
590 | iop_desc_set_byte_count(grp_start, iop_chan, len); |
591 | iop_desc_set_block_fill_val(grp_start, value); | |
0036731c | 592 | iop_desc_set_dest_addr(grp_start, iop_chan, dma_dest); |
c2110923 DW |
593 | sw_desc->unmap_src_cnt = 1; |
594 | sw_desc->unmap_len = len; | |
636bdeaa | 595 | sw_desc->async_tx.flags = flags; |
c2110923 DW |
596 | } |
597 | spin_unlock_bh(&iop_chan->lock); | |
598 | ||
599 | return sw_desc ? &sw_desc->async_tx : NULL; | |
600 | } | |
601 | ||
c2110923 | 602 | static struct dma_async_tx_descriptor * |
0036731c DW |
603 | iop_adma_prep_dma_xor(struct dma_chan *chan, dma_addr_t dma_dest, |
604 | dma_addr_t *dma_src, unsigned int src_cnt, size_t len, | |
d4c56f97 | 605 | unsigned long flags) |
c2110923 DW |
606 | { |
607 | struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan); | |
608 | struct iop_adma_desc_slot *sw_desc, *grp_start; | |
609 | int slot_cnt, slots_per_op; | |
610 | ||
611 | if (unlikely(!len)) | |
612 | return NULL; | |
613 | BUG_ON(unlikely(len > IOP_ADMA_XOR_MAX_BYTE_COUNT)); | |
614 | ||
615 | dev_dbg(iop_chan->device->common.dev, | |
d4c56f97 | 616 | "%s src_cnt: %d len: %u flags: %lx\n", |
3d9b525b | 617 | __func__, src_cnt, len, flags); |
c2110923 DW |
618 | |
619 | spin_lock_bh(&iop_chan->lock); | |
620 | slot_cnt = iop_chan_xor_slot_count(len, src_cnt, &slots_per_op); | |
621 | sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op); | |
622 | if (sw_desc) { | |
623 | grp_start = sw_desc->group_head; | |
d4c56f97 | 624 | iop_desc_init_xor(grp_start, src_cnt, flags); |
c2110923 | 625 | iop_desc_set_byte_count(grp_start, iop_chan, len); |
0036731c | 626 | iop_desc_set_dest_addr(grp_start, iop_chan, dma_dest); |
c2110923 DW |
627 | sw_desc->unmap_src_cnt = src_cnt; |
628 | sw_desc->unmap_len = len; | |
636bdeaa | 629 | sw_desc->async_tx.flags = flags; |
0036731c DW |
630 | while (src_cnt--) |
631 | iop_desc_set_xor_src_addr(grp_start, src_cnt, | |
632 | dma_src[src_cnt]); | |
c2110923 DW |
633 | } |
634 | spin_unlock_bh(&iop_chan->lock); | |
635 | ||
636 | return sw_desc ? &sw_desc->async_tx : NULL; | |
637 | } | |
638 | ||
c2110923 | 639 | static struct dma_async_tx_descriptor * |
0036731c DW |
640 | iop_adma_prep_dma_zero_sum(struct dma_chan *chan, dma_addr_t *dma_src, |
641 | unsigned int src_cnt, size_t len, u32 *result, | |
d4c56f97 | 642 | unsigned long flags) |
c2110923 DW |
643 | { |
644 | struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan); | |
645 | struct iop_adma_desc_slot *sw_desc, *grp_start; | |
646 | int slot_cnt, slots_per_op; | |
647 | ||
648 | if (unlikely(!len)) | |
649 | return NULL; | |
650 | ||
651 | dev_dbg(iop_chan->device->common.dev, "%s src_cnt: %d len: %u\n", | |
3d9b525b | 652 | __func__, src_cnt, len); |
c2110923 DW |
653 | |
654 | spin_lock_bh(&iop_chan->lock); | |
655 | slot_cnt = iop_chan_zero_sum_slot_count(len, src_cnt, &slots_per_op); | |
656 | sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op); | |
657 | if (sw_desc) { | |
658 | grp_start = sw_desc->group_head; | |
d4c56f97 | 659 | iop_desc_init_zero_sum(grp_start, src_cnt, flags); |
c2110923 DW |
660 | iop_desc_set_zero_sum_byte_count(grp_start, len); |
661 | grp_start->xor_check_result = result; | |
662 | pr_debug("\t%s: grp_start->xor_check_result: %p\n", | |
3d9b525b | 663 | __func__, grp_start->xor_check_result); |
c2110923 DW |
664 | sw_desc->unmap_src_cnt = src_cnt; |
665 | sw_desc->unmap_len = len; | |
636bdeaa | 666 | sw_desc->async_tx.flags = flags; |
0036731c DW |
667 | while (src_cnt--) |
668 | iop_desc_set_zero_sum_src_addr(grp_start, src_cnt, | |
669 | dma_src[src_cnt]); | |
c2110923 DW |
670 | } |
671 | spin_unlock_bh(&iop_chan->lock); | |
672 | ||
673 | return sw_desc ? &sw_desc->async_tx : NULL; | |
674 | } | |
675 | ||
c2110923 DW |
676 | static void iop_adma_free_chan_resources(struct dma_chan *chan) |
677 | { | |
678 | struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan); | |
679 | struct iop_adma_desc_slot *iter, *_iter; | |
680 | int in_use_descs = 0; | |
681 | ||
682 | iop_adma_slot_cleanup(iop_chan); | |
683 | ||
684 | spin_lock_bh(&iop_chan->lock); | |
685 | list_for_each_entry_safe(iter, _iter, &iop_chan->chain, | |
686 | chain_node) { | |
687 | in_use_descs++; | |
688 | list_del(&iter->chain_node); | |
689 | } | |
690 | list_for_each_entry_safe_reverse( | |
691 | iter, _iter, &iop_chan->all_slots, slot_node) { | |
692 | list_del(&iter->slot_node); | |
693 | kfree(iter); | |
694 | iop_chan->slots_allocated--; | |
695 | } | |
696 | iop_chan->last_used = NULL; | |
697 | ||
698 | dev_dbg(iop_chan->device->common.dev, "%s slots_allocated %d\n", | |
3d9b525b | 699 | __func__, iop_chan->slots_allocated); |
c2110923 DW |
700 | spin_unlock_bh(&iop_chan->lock); |
701 | ||
702 | /* one is ok since we left it on there on purpose */ | |
703 | if (in_use_descs > 1) | |
704 | printk(KERN_ERR "IOP: Freeing %d in use descriptors!\n", | |
705 | in_use_descs - 1); | |
706 | } | |
707 | ||
708 | /** | |
709 | * iop_adma_is_complete - poll the status of an ADMA transaction | |
710 | * @chan: ADMA channel handle | |
711 | * @cookie: ADMA transaction identifier | |
712 | */ | |
713 | static enum dma_status iop_adma_is_complete(struct dma_chan *chan, | |
714 | dma_cookie_t cookie, | |
715 | dma_cookie_t *done, | |
716 | dma_cookie_t *used) | |
717 | { | |
718 | struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan); | |
719 | dma_cookie_t last_used; | |
720 | dma_cookie_t last_complete; | |
721 | enum dma_status ret; | |
722 | ||
723 | last_used = chan->cookie; | |
724 | last_complete = iop_chan->completed_cookie; | |
725 | ||
726 | if (done) | |
727 | *done = last_complete; | |
728 | if (used) | |
729 | *used = last_used; | |
730 | ||
731 | ret = dma_async_is_complete(cookie, last_complete, last_used); | |
732 | if (ret == DMA_SUCCESS) | |
733 | return ret; | |
734 | ||
735 | iop_adma_slot_cleanup(iop_chan); | |
736 | ||
737 | last_used = chan->cookie; | |
738 | last_complete = iop_chan->completed_cookie; | |
739 | ||
740 | if (done) | |
741 | *done = last_complete; | |
742 | if (used) | |
743 | *used = last_used; | |
744 | ||
745 | return dma_async_is_complete(cookie, last_complete, last_used); | |
746 | } | |
747 | ||
748 | static irqreturn_t iop_adma_eot_handler(int irq, void *data) | |
749 | { | |
750 | struct iop_adma_chan *chan = data; | |
751 | ||
3d9b525b | 752 | dev_dbg(chan->device->common.dev, "%s\n", __func__); |
c2110923 DW |
753 | |
754 | tasklet_schedule(&chan->irq_tasklet); | |
755 | ||
756 | iop_adma_device_clear_eot_status(chan); | |
757 | ||
758 | return IRQ_HANDLED; | |
759 | } | |
760 | ||
761 | static irqreturn_t iop_adma_eoc_handler(int irq, void *data) | |
762 | { | |
763 | struct iop_adma_chan *chan = data; | |
764 | ||
3d9b525b | 765 | dev_dbg(chan->device->common.dev, "%s\n", __func__); |
c2110923 DW |
766 | |
767 | tasklet_schedule(&chan->irq_tasklet); | |
768 | ||
769 | iop_adma_device_clear_eoc_status(chan); | |
770 | ||
771 | return IRQ_HANDLED; | |
772 | } | |
773 | ||
774 | static irqreturn_t iop_adma_err_handler(int irq, void *data) | |
775 | { | |
776 | struct iop_adma_chan *chan = data; | |
777 | unsigned long status = iop_chan_get_status(chan); | |
778 | ||
779 | dev_printk(KERN_ERR, chan->device->common.dev, | |
780 | "error ( %s%s%s%s%s%s%s)\n", | |
781 | iop_is_err_int_parity(status, chan) ? "int_parity " : "", | |
782 | iop_is_err_mcu_abort(status, chan) ? "mcu_abort " : "", | |
783 | iop_is_err_int_tabort(status, chan) ? "int_tabort " : "", | |
784 | iop_is_err_int_mabort(status, chan) ? "int_mabort " : "", | |
785 | iop_is_err_pci_tabort(status, chan) ? "pci_tabort " : "", | |
786 | iop_is_err_pci_mabort(status, chan) ? "pci_mabort " : "", | |
787 | iop_is_err_split_tx(status, chan) ? "split_tx " : ""); | |
788 | ||
789 | iop_adma_device_clear_err_status(chan); | |
790 | ||
791 | BUG(); | |
792 | ||
793 | return IRQ_HANDLED; | |
794 | } | |
795 | ||
796 | static void iop_adma_issue_pending(struct dma_chan *chan) | |
797 | { | |
798 | struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan); | |
799 | ||
800 | if (iop_chan->pending) { | |
801 | iop_chan->pending = 0; | |
802 | iop_chan_append(iop_chan); | |
803 | } | |
804 | } | |
805 | ||
806 | /* | |
807 | * Perform a transaction to verify the HW works. | |
808 | */ | |
809 | #define IOP_ADMA_TEST_SIZE 2000 | |
810 | ||
811 | static int __devinit iop_adma_memcpy_self_test(struct iop_adma_device *device) | |
812 | { | |
813 | int i; | |
814 | void *src, *dest; | |
815 | dma_addr_t src_dma, dest_dma; | |
816 | struct dma_chan *dma_chan; | |
817 | dma_cookie_t cookie; | |
818 | struct dma_async_tx_descriptor *tx; | |
819 | int err = 0; | |
820 | struct iop_adma_chan *iop_chan; | |
821 | ||
3d9b525b | 822 | dev_dbg(device->common.dev, "%s\n", __func__); |
c2110923 DW |
823 | |
824 | src = kzalloc(sizeof(u8) * IOP_ADMA_TEST_SIZE, GFP_KERNEL); | |
825 | if (!src) | |
826 | return -ENOMEM; | |
827 | dest = kzalloc(sizeof(u8) * IOP_ADMA_TEST_SIZE, GFP_KERNEL); | |
828 | if (!dest) { | |
829 | kfree(src); | |
830 | return -ENOMEM; | |
831 | } | |
832 | ||
833 | /* Fill in src buffer */ | |
834 | for (i = 0; i < IOP_ADMA_TEST_SIZE; i++) | |
835 | ((u8 *) src)[i] = (u8)i; | |
836 | ||
837 | memset(dest, 0, IOP_ADMA_TEST_SIZE); | |
838 | ||
839 | /* Start copy, using first DMA channel */ | |
840 | dma_chan = container_of(device->common.channels.next, | |
841 | struct dma_chan, | |
842 | device_node); | |
843 | if (iop_adma_alloc_chan_resources(dma_chan) < 1) { | |
844 | err = -ENODEV; | |
845 | goto out; | |
846 | } | |
847 | ||
c2110923 DW |
848 | dest_dma = dma_map_single(dma_chan->device->dev, dest, |
849 | IOP_ADMA_TEST_SIZE, DMA_FROM_DEVICE); | |
c2110923 DW |
850 | src_dma = dma_map_single(dma_chan->device->dev, src, |
851 | IOP_ADMA_TEST_SIZE, DMA_TO_DEVICE); | |
0036731c | 852 | tx = iop_adma_prep_dma_memcpy(dma_chan, dest_dma, src_dma, |
636bdeaa DW |
853 | IOP_ADMA_TEST_SIZE, |
854 | DMA_PREP_INTERRUPT | DMA_CTRL_ACK); | |
c2110923 DW |
855 | |
856 | cookie = iop_adma_tx_submit(tx); | |
857 | iop_adma_issue_pending(dma_chan); | |
c2110923 DW |
858 | msleep(1); |
859 | ||
860 | if (iop_adma_is_complete(dma_chan, cookie, NULL, NULL) != | |
861 | DMA_SUCCESS) { | |
862 | dev_printk(KERN_ERR, dma_chan->device->dev, | |
863 | "Self-test copy timed out, disabling\n"); | |
864 | err = -ENODEV; | |
865 | goto free_resources; | |
866 | } | |
867 | ||
868 | iop_chan = to_iop_adma_chan(dma_chan); | |
869 | dma_sync_single_for_cpu(&iop_chan->device->pdev->dev, dest_dma, | |
870 | IOP_ADMA_TEST_SIZE, DMA_FROM_DEVICE); | |
871 | if (memcmp(src, dest, IOP_ADMA_TEST_SIZE)) { | |
872 | dev_printk(KERN_ERR, dma_chan->device->dev, | |
873 | "Self-test copy failed compare, disabling\n"); | |
874 | err = -ENODEV; | |
875 | goto free_resources; | |
876 | } | |
877 | ||
878 | free_resources: | |
879 | iop_adma_free_chan_resources(dma_chan); | |
880 | out: | |
881 | kfree(src); | |
882 | kfree(dest); | |
883 | return err; | |
884 | } | |
885 | ||
886 | #define IOP_ADMA_NUM_SRC_TEST 4 /* must be <= 15 */ | |
887 | static int __devinit | |
888 | iop_adma_xor_zero_sum_self_test(struct iop_adma_device *device) | |
889 | { | |
890 | int i, src_idx; | |
891 | struct page *dest; | |
892 | struct page *xor_srcs[IOP_ADMA_NUM_SRC_TEST]; | |
893 | struct page *zero_sum_srcs[IOP_ADMA_NUM_SRC_TEST + 1]; | |
0036731c | 894 | dma_addr_t dma_srcs[IOP_ADMA_NUM_SRC_TEST + 1]; |
c2110923 DW |
895 | dma_addr_t dma_addr, dest_dma; |
896 | struct dma_async_tx_descriptor *tx; | |
897 | struct dma_chan *dma_chan; | |
898 | dma_cookie_t cookie; | |
899 | u8 cmp_byte = 0; | |
900 | u32 cmp_word; | |
901 | u32 zero_sum_result; | |
902 | int err = 0; | |
903 | struct iop_adma_chan *iop_chan; | |
904 | ||
3d9b525b | 905 | dev_dbg(device->common.dev, "%s\n", __func__); |
c2110923 DW |
906 | |
907 | for (src_idx = 0; src_idx < IOP_ADMA_NUM_SRC_TEST; src_idx++) { | |
908 | xor_srcs[src_idx] = alloc_page(GFP_KERNEL); | |
909 | if (!xor_srcs[src_idx]) | |
910 | while (src_idx--) { | |
911 | __free_page(xor_srcs[src_idx]); | |
912 | return -ENOMEM; | |
913 | } | |
914 | } | |
915 | ||
916 | dest = alloc_page(GFP_KERNEL); | |
917 | if (!dest) | |
918 | while (src_idx--) { | |
919 | __free_page(xor_srcs[src_idx]); | |
920 | return -ENOMEM; | |
921 | } | |
922 | ||
923 | /* Fill in src buffers */ | |
924 | for (src_idx = 0; src_idx < IOP_ADMA_NUM_SRC_TEST; src_idx++) { | |
925 | u8 *ptr = page_address(xor_srcs[src_idx]); | |
926 | for (i = 0; i < PAGE_SIZE; i++) | |
927 | ptr[i] = (1 << src_idx); | |
928 | } | |
929 | ||
930 | for (src_idx = 0; src_idx < IOP_ADMA_NUM_SRC_TEST; src_idx++) | |
931 | cmp_byte ^= (u8) (1 << src_idx); | |
932 | ||
933 | cmp_word = (cmp_byte << 24) | (cmp_byte << 16) | | |
934 | (cmp_byte << 8) | cmp_byte; | |
935 | ||
936 | memset(page_address(dest), 0, PAGE_SIZE); | |
937 | ||
938 | dma_chan = container_of(device->common.channels.next, | |
939 | struct dma_chan, | |
940 | device_node); | |
941 | if (iop_adma_alloc_chan_resources(dma_chan) < 1) { | |
942 | err = -ENODEV; | |
943 | goto out; | |
944 | } | |
945 | ||
946 | /* test xor */ | |
c2110923 DW |
947 | dest_dma = dma_map_page(dma_chan->device->dev, dest, 0, |
948 | PAGE_SIZE, DMA_FROM_DEVICE); | |
0036731c DW |
949 | for (i = 0; i < IOP_ADMA_NUM_SRC_TEST; i++) |
950 | dma_srcs[i] = dma_map_page(dma_chan->device->dev, xor_srcs[i], | |
951 | 0, PAGE_SIZE, DMA_TO_DEVICE); | |
952 | tx = iop_adma_prep_dma_xor(dma_chan, dest_dma, dma_srcs, | |
636bdeaa DW |
953 | IOP_ADMA_NUM_SRC_TEST, PAGE_SIZE, |
954 | DMA_PREP_INTERRUPT | DMA_CTRL_ACK); | |
c2110923 DW |
955 | |
956 | cookie = iop_adma_tx_submit(tx); | |
957 | iop_adma_issue_pending(dma_chan); | |
c2110923 DW |
958 | msleep(8); |
959 | ||
960 | if (iop_adma_is_complete(dma_chan, cookie, NULL, NULL) != | |
961 | DMA_SUCCESS) { | |
962 | dev_printk(KERN_ERR, dma_chan->device->dev, | |
963 | "Self-test xor timed out, disabling\n"); | |
964 | err = -ENODEV; | |
965 | goto free_resources; | |
966 | } | |
967 | ||
968 | iop_chan = to_iop_adma_chan(dma_chan); | |
969 | dma_sync_single_for_cpu(&iop_chan->device->pdev->dev, dest_dma, | |
970 | PAGE_SIZE, DMA_FROM_DEVICE); | |
971 | for (i = 0; i < (PAGE_SIZE / sizeof(u32)); i++) { | |
972 | u32 *ptr = page_address(dest); | |
973 | if (ptr[i] != cmp_word) { | |
974 | dev_printk(KERN_ERR, dma_chan->device->dev, | |
975 | "Self-test xor failed compare, disabling\n"); | |
976 | err = -ENODEV; | |
977 | goto free_resources; | |
978 | } | |
979 | } | |
980 | dma_sync_single_for_device(&iop_chan->device->pdev->dev, dest_dma, | |
981 | PAGE_SIZE, DMA_TO_DEVICE); | |
982 | ||
983 | /* skip zero sum if the capability is not present */ | |
984 | if (!dma_has_cap(DMA_ZERO_SUM, dma_chan->device->cap_mask)) | |
985 | goto free_resources; | |
986 | ||
987 | /* zero sum the sources with the destintation page */ | |
988 | for (i = 0; i < IOP_ADMA_NUM_SRC_TEST; i++) | |
989 | zero_sum_srcs[i] = xor_srcs[i]; | |
990 | zero_sum_srcs[i] = dest; | |
991 | ||
992 | zero_sum_result = 1; | |
993 | ||
0036731c DW |
994 | for (i = 0; i < IOP_ADMA_NUM_SRC_TEST + 1; i++) |
995 | dma_srcs[i] = dma_map_page(dma_chan->device->dev, | |
996 | zero_sum_srcs[i], 0, PAGE_SIZE, | |
997 | DMA_TO_DEVICE); | |
998 | tx = iop_adma_prep_dma_zero_sum(dma_chan, dma_srcs, | |
999 | IOP_ADMA_NUM_SRC_TEST + 1, PAGE_SIZE, | |
636bdeaa DW |
1000 | &zero_sum_result, |
1001 | DMA_PREP_INTERRUPT | DMA_CTRL_ACK); | |
c2110923 DW |
1002 | |
1003 | cookie = iop_adma_tx_submit(tx); | |
1004 | iop_adma_issue_pending(dma_chan); | |
c2110923 DW |
1005 | msleep(8); |
1006 | ||
1007 | if (iop_adma_is_complete(dma_chan, cookie, NULL, NULL) != DMA_SUCCESS) { | |
1008 | dev_printk(KERN_ERR, dma_chan->device->dev, | |
1009 | "Self-test zero sum timed out, disabling\n"); | |
1010 | err = -ENODEV; | |
1011 | goto free_resources; | |
1012 | } | |
1013 | ||
1014 | if (zero_sum_result != 0) { | |
1015 | dev_printk(KERN_ERR, dma_chan->device->dev, | |
1016 | "Self-test zero sum failed compare, disabling\n"); | |
1017 | err = -ENODEV; | |
1018 | goto free_resources; | |
1019 | } | |
1020 | ||
1021 | /* test memset */ | |
c2110923 DW |
1022 | dma_addr = dma_map_page(dma_chan->device->dev, dest, 0, |
1023 | PAGE_SIZE, DMA_FROM_DEVICE); | |
636bdeaa DW |
1024 | tx = iop_adma_prep_dma_memset(dma_chan, dma_addr, 0, PAGE_SIZE, |
1025 | DMA_PREP_INTERRUPT | DMA_CTRL_ACK); | |
c2110923 DW |
1026 | |
1027 | cookie = iop_adma_tx_submit(tx); | |
1028 | iop_adma_issue_pending(dma_chan); | |
c2110923 DW |
1029 | msleep(8); |
1030 | ||
1031 | if (iop_adma_is_complete(dma_chan, cookie, NULL, NULL) != DMA_SUCCESS) { | |
1032 | dev_printk(KERN_ERR, dma_chan->device->dev, | |
1033 | "Self-test memset timed out, disabling\n"); | |
1034 | err = -ENODEV; | |
1035 | goto free_resources; | |
1036 | } | |
1037 | ||
1038 | for (i = 0; i < PAGE_SIZE/sizeof(u32); i++) { | |
1039 | u32 *ptr = page_address(dest); | |
1040 | if (ptr[i]) { | |
1041 | dev_printk(KERN_ERR, dma_chan->device->dev, | |
1042 | "Self-test memset failed compare, disabling\n"); | |
1043 | err = -ENODEV; | |
1044 | goto free_resources; | |
1045 | } | |
1046 | } | |
1047 | ||
1048 | /* test for non-zero parity sum */ | |
1049 | zero_sum_result = 0; | |
0036731c DW |
1050 | for (i = 0; i < IOP_ADMA_NUM_SRC_TEST + 1; i++) |
1051 | dma_srcs[i] = dma_map_page(dma_chan->device->dev, | |
1052 | zero_sum_srcs[i], 0, PAGE_SIZE, | |
1053 | DMA_TO_DEVICE); | |
1054 | tx = iop_adma_prep_dma_zero_sum(dma_chan, dma_srcs, | |
1055 | IOP_ADMA_NUM_SRC_TEST + 1, PAGE_SIZE, | |
636bdeaa DW |
1056 | &zero_sum_result, |
1057 | DMA_PREP_INTERRUPT | DMA_CTRL_ACK); | |
c2110923 DW |
1058 | |
1059 | cookie = iop_adma_tx_submit(tx); | |
1060 | iop_adma_issue_pending(dma_chan); | |
c2110923 DW |
1061 | msleep(8); |
1062 | ||
1063 | if (iop_adma_is_complete(dma_chan, cookie, NULL, NULL) != DMA_SUCCESS) { | |
1064 | dev_printk(KERN_ERR, dma_chan->device->dev, | |
1065 | "Self-test non-zero sum timed out, disabling\n"); | |
1066 | err = -ENODEV; | |
1067 | goto free_resources; | |
1068 | } | |
1069 | ||
1070 | if (zero_sum_result != 1) { | |
1071 | dev_printk(KERN_ERR, dma_chan->device->dev, | |
1072 | "Self-test non-zero sum failed compare, disabling\n"); | |
1073 | err = -ENODEV; | |
1074 | goto free_resources; | |
1075 | } | |
1076 | ||
1077 | free_resources: | |
1078 | iop_adma_free_chan_resources(dma_chan); | |
1079 | out: | |
1080 | src_idx = IOP_ADMA_NUM_SRC_TEST; | |
1081 | while (src_idx--) | |
1082 | __free_page(xor_srcs[src_idx]); | |
1083 | __free_page(dest); | |
1084 | return err; | |
1085 | } | |
1086 | ||
1087 | static int __devexit iop_adma_remove(struct platform_device *dev) | |
1088 | { | |
1089 | struct iop_adma_device *device = platform_get_drvdata(dev); | |
1090 | struct dma_chan *chan, *_chan; | |
1091 | struct iop_adma_chan *iop_chan; | |
1092 | int i; | |
1093 | struct iop_adma_platform_data *plat_data = dev->dev.platform_data; | |
1094 | ||
1095 | dma_async_device_unregister(&device->common); | |
1096 | ||
1097 | for (i = 0; i < 3; i++) { | |
1098 | unsigned int irq; | |
1099 | irq = platform_get_irq(dev, i); | |
1100 | free_irq(irq, device); | |
1101 | } | |
1102 | ||
1103 | dma_free_coherent(&dev->dev, plat_data->pool_size, | |
1104 | device->dma_desc_pool_virt, device->dma_desc_pool); | |
1105 | ||
1106 | do { | |
1107 | struct resource *res; | |
1108 | res = platform_get_resource(dev, IORESOURCE_MEM, 0); | |
1109 | release_mem_region(res->start, res->end - res->start); | |
1110 | } while (0); | |
1111 | ||
1112 | list_for_each_entry_safe(chan, _chan, &device->common.channels, | |
1113 | device_node) { | |
1114 | iop_chan = to_iop_adma_chan(chan); | |
1115 | list_del(&chan->device_node); | |
1116 | kfree(iop_chan); | |
1117 | } | |
1118 | kfree(device); | |
1119 | ||
1120 | return 0; | |
1121 | } | |
1122 | ||
1123 | static int __devinit iop_adma_probe(struct platform_device *pdev) | |
1124 | { | |
1125 | struct resource *res; | |
1126 | int ret = 0, i; | |
1127 | struct iop_adma_device *adev; | |
1128 | struct iop_adma_chan *iop_chan; | |
1129 | struct dma_device *dma_dev; | |
1130 | struct iop_adma_platform_data *plat_data = pdev->dev.platform_data; | |
1131 | ||
1132 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
1133 | if (!res) | |
1134 | return -ENODEV; | |
1135 | ||
1136 | if (!devm_request_mem_region(&pdev->dev, res->start, | |
1137 | res->end - res->start, pdev->name)) | |
1138 | return -EBUSY; | |
1139 | ||
1140 | adev = kzalloc(sizeof(*adev), GFP_KERNEL); | |
1141 | if (!adev) | |
1142 | return -ENOMEM; | |
1143 | dma_dev = &adev->common; | |
1144 | ||
1145 | /* allocate coherent memory for hardware descriptors | |
1146 | * note: writecombine gives slightly better performance, but | |
1147 | * requires that we explicitly flush the writes | |
1148 | */ | |
1149 | if ((adev->dma_desc_pool_virt = dma_alloc_writecombine(&pdev->dev, | |
1150 | plat_data->pool_size, | |
1151 | &adev->dma_desc_pool, | |
1152 | GFP_KERNEL)) == NULL) { | |
1153 | ret = -ENOMEM; | |
1154 | goto err_free_adev; | |
1155 | } | |
1156 | ||
1157 | dev_dbg(&pdev->dev, "%s: allocted descriptor pool virt %p phys %p\n", | |
3d9b525b | 1158 | __func__, adev->dma_desc_pool_virt, |
c2110923 DW |
1159 | (void *) adev->dma_desc_pool); |
1160 | ||
1161 | adev->id = plat_data->hw_id; | |
1162 | ||
1163 | /* discover transaction capabilites from the platform data */ | |
1164 | dma_dev->cap_mask = plat_data->cap_mask; | |
1165 | ||
1166 | adev->pdev = pdev; | |
1167 | platform_set_drvdata(pdev, adev); | |
1168 | ||
1169 | INIT_LIST_HEAD(&dma_dev->channels); | |
1170 | ||
1171 | /* set base routines */ | |
1172 | dma_dev->device_alloc_chan_resources = iop_adma_alloc_chan_resources; | |
1173 | dma_dev->device_free_chan_resources = iop_adma_free_chan_resources; | |
1174 | dma_dev->device_is_tx_complete = iop_adma_is_complete; | |
1175 | dma_dev->device_issue_pending = iop_adma_issue_pending; | |
c2110923 DW |
1176 | dma_dev->dev = &pdev->dev; |
1177 | ||
1178 | /* set prep routines based on capability */ | |
1179 | if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask)) | |
1180 | dma_dev->device_prep_dma_memcpy = iop_adma_prep_dma_memcpy; | |
1181 | if (dma_has_cap(DMA_MEMSET, dma_dev->cap_mask)) | |
1182 | dma_dev->device_prep_dma_memset = iop_adma_prep_dma_memset; | |
1183 | if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) { | |
1184 | dma_dev->max_xor = iop_adma_get_max_xor(); | |
1185 | dma_dev->device_prep_dma_xor = iop_adma_prep_dma_xor; | |
1186 | } | |
1187 | if (dma_has_cap(DMA_ZERO_SUM, dma_dev->cap_mask)) | |
1188 | dma_dev->device_prep_dma_zero_sum = | |
1189 | iop_adma_prep_dma_zero_sum; | |
1190 | if (dma_has_cap(DMA_INTERRUPT, dma_dev->cap_mask)) | |
1191 | dma_dev->device_prep_dma_interrupt = | |
1192 | iop_adma_prep_dma_interrupt; | |
1193 | ||
1194 | iop_chan = kzalloc(sizeof(*iop_chan), GFP_KERNEL); | |
1195 | if (!iop_chan) { | |
1196 | ret = -ENOMEM; | |
1197 | goto err_free_dma; | |
1198 | } | |
1199 | iop_chan->device = adev; | |
1200 | ||
1201 | iop_chan->mmr_base = devm_ioremap(&pdev->dev, res->start, | |
1202 | res->end - res->start); | |
1203 | if (!iop_chan->mmr_base) { | |
1204 | ret = -ENOMEM; | |
1205 | goto err_free_iop_chan; | |
1206 | } | |
1207 | tasklet_init(&iop_chan->irq_tasklet, iop_adma_tasklet, (unsigned long) | |
1208 | iop_chan); | |
1209 | ||
1210 | /* clear errors before enabling interrupts */ | |
1211 | iop_adma_device_clear_err_status(iop_chan); | |
1212 | ||
1213 | for (i = 0; i < 3; i++) { | |
1214 | irq_handler_t handler[] = { iop_adma_eot_handler, | |
1215 | iop_adma_eoc_handler, | |
1216 | iop_adma_err_handler }; | |
1217 | int irq = platform_get_irq(pdev, i); | |
1218 | if (irq < 0) { | |
1219 | ret = -ENXIO; | |
1220 | goto err_free_iop_chan; | |
1221 | } else { | |
1222 | ret = devm_request_irq(&pdev->dev, irq, | |
1223 | handler[i], 0, pdev->name, iop_chan); | |
1224 | if (ret) | |
1225 | goto err_free_iop_chan; | |
1226 | } | |
1227 | } | |
1228 | ||
1229 | spin_lock_init(&iop_chan->lock); | |
c2110923 DW |
1230 | INIT_LIST_HEAD(&iop_chan->chain); |
1231 | INIT_LIST_HEAD(&iop_chan->all_slots); | |
1232 | INIT_RCU_HEAD(&iop_chan->common.rcu); | |
1233 | iop_chan->common.device = dma_dev; | |
1234 | list_add_tail(&iop_chan->common.device_node, &dma_dev->channels); | |
1235 | ||
1236 | if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask)) { | |
1237 | ret = iop_adma_memcpy_self_test(adev); | |
1238 | dev_dbg(&pdev->dev, "memcpy self test returned %d\n", ret); | |
1239 | if (ret) | |
1240 | goto err_free_iop_chan; | |
1241 | } | |
1242 | ||
1243 | if (dma_has_cap(DMA_XOR, dma_dev->cap_mask) || | |
1244 | dma_has_cap(DMA_MEMSET, dma_dev->cap_mask)) { | |
1245 | ret = iop_adma_xor_zero_sum_self_test(adev); | |
1246 | dev_dbg(&pdev->dev, "xor self test returned %d\n", ret); | |
1247 | if (ret) | |
1248 | goto err_free_iop_chan; | |
1249 | } | |
1250 | ||
1251 | dev_printk(KERN_INFO, &pdev->dev, "Intel(R) IOP: " | |
1252 | "( %s%s%s%s%s%s%s%s%s%s)\n", | |
1253 | dma_has_cap(DMA_PQ_XOR, dma_dev->cap_mask) ? "pq_xor " : "", | |
1254 | dma_has_cap(DMA_PQ_UPDATE, dma_dev->cap_mask) ? "pq_update " : "", | |
1255 | dma_has_cap(DMA_PQ_ZERO_SUM, dma_dev->cap_mask) ? "pq_zero_sum " : "", | |
1256 | dma_has_cap(DMA_XOR, dma_dev->cap_mask) ? "xor " : "", | |
1257 | dma_has_cap(DMA_DUAL_XOR, dma_dev->cap_mask) ? "dual_xor " : "", | |
1258 | dma_has_cap(DMA_ZERO_SUM, dma_dev->cap_mask) ? "xor_zero_sum " : "", | |
1259 | dma_has_cap(DMA_MEMSET, dma_dev->cap_mask) ? "fill " : "", | |
1260 | dma_has_cap(DMA_MEMCPY_CRC32C, dma_dev->cap_mask) ? "cpy+crc " : "", | |
1261 | dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask) ? "cpy " : "", | |
1262 | dma_has_cap(DMA_INTERRUPT, dma_dev->cap_mask) ? "intr " : ""); | |
1263 | ||
1264 | dma_async_device_register(dma_dev); | |
1265 | goto out; | |
1266 | ||
1267 | err_free_iop_chan: | |
1268 | kfree(iop_chan); | |
1269 | err_free_dma: | |
1270 | dma_free_coherent(&adev->pdev->dev, plat_data->pool_size, | |
1271 | adev->dma_desc_pool_virt, adev->dma_desc_pool); | |
1272 | err_free_adev: | |
1273 | kfree(adev); | |
1274 | out: | |
1275 | return ret; | |
1276 | } | |
1277 | ||
1278 | static void iop_chan_start_null_memcpy(struct iop_adma_chan *iop_chan) | |
1279 | { | |
1280 | struct iop_adma_desc_slot *sw_desc, *grp_start; | |
1281 | dma_cookie_t cookie; | |
1282 | int slot_cnt, slots_per_op; | |
1283 | ||
3d9b525b | 1284 | dev_dbg(iop_chan->device->common.dev, "%s\n", __func__); |
c2110923 DW |
1285 | |
1286 | spin_lock_bh(&iop_chan->lock); | |
1287 | slot_cnt = iop_chan_memcpy_slot_count(0, &slots_per_op); | |
1288 | sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op); | |
1289 | if (sw_desc) { | |
1290 | grp_start = sw_desc->group_head; | |
1291 | ||
1292 | list_splice_init(&sw_desc->async_tx.tx_list, &iop_chan->chain); | |
636bdeaa | 1293 | async_tx_ack(&sw_desc->async_tx); |
c2110923 DW |
1294 | iop_desc_init_memcpy(grp_start, 0); |
1295 | iop_desc_set_byte_count(grp_start, iop_chan, 0); | |
1296 | iop_desc_set_dest_addr(grp_start, iop_chan, 0); | |
1297 | iop_desc_set_memcpy_src_addr(grp_start, 0); | |
1298 | ||
1299 | cookie = iop_chan->common.cookie; | |
1300 | cookie++; | |
1301 | if (cookie <= 1) | |
1302 | cookie = 2; | |
1303 | ||
1304 | /* initialize the completed cookie to be less than | |
1305 | * the most recently used cookie | |
1306 | */ | |
1307 | iop_chan->completed_cookie = cookie - 1; | |
1308 | iop_chan->common.cookie = sw_desc->async_tx.cookie = cookie; | |
1309 | ||
1310 | /* channel should not be busy */ | |
1311 | BUG_ON(iop_chan_is_busy(iop_chan)); | |
1312 | ||
1313 | /* clear any prior error-status bits */ | |
1314 | iop_adma_device_clear_err_status(iop_chan); | |
1315 | ||
1316 | /* disable operation */ | |
1317 | iop_chan_disable(iop_chan); | |
1318 | ||
1319 | /* set the descriptor address */ | |
1320 | iop_chan_set_next_descriptor(iop_chan, sw_desc->async_tx.phys); | |
1321 | ||
1322 | /* 1/ don't add pre-chained descriptors | |
1323 | * 2/ dummy read to flush next_desc write | |
1324 | */ | |
1325 | BUG_ON(iop_desc_get_next_desc(sw_desc)); | |
1326 | ||
1327 | /* run the descriptor */ | |
1328 | iop_chan_enable(iop_chan); | |
1329 | } else | |
1330 | dev_printk(KERN_ERR, iop_chan->device->common.dev, | |
1331 | "failed to allocate null descriptor\n"); | |
1332 | spin_unlock_bh(&iop_chan->lock); | |
1333 | } | |
1334 | ||
1335 | static void iop_chan_start_null_xor(struct iop_adma_chan *iop_chan) | |
1336 | { | |
1337 | struct iop_adma_desc_slot *sw_desc, *grp_start; | |
1338 | dma_cookie_t cookie; | |
1339 | int slot_cnt, slots_per_op; | |
1340 | ||
3d9b525b | 1341 | dev_dbg(iop_chan->device->common.dev, "%s\n", __func__); |
c2110923 DW |
1342 | |
1343 | spin_lock_bh(&iop_chan->lock); | |
1344 | slot_cnt = iop_chan_xor_slot_count(0, 2, &slots_per_op); | |
1345 | sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op); | |
1346 | if (sw_desc) { | |
1347 | grp_start = sw_desc->group_head; | |
1348 | list_splice_init(&sw_desc->async_tx.tx_list, &iop_chan->chain); | |
636bdeaa | 1349 | async_tx_ack(&sw_desc->async_tx); |
c2110923 DW |
1350 | iop_desc_init_null_xor(grp_start, 2, 0); |
1351 | iop_desc_set_byte_count(grp_start, iop_chan, 0); | |
1352 | iop_desc_set_dest_addr(grp_start, iop_chan, 0); | |
1353 | iop_desc_set_xor_src_addr(grp_start, 0, 0); | |
1354 | iop_desc_set_xor_src_addr(grp_start, 1, 0); | |
1355 | ||
1356 | cookie = iop_chan->common.cookie; | |
1357 | cookie++; | |
1358 | if (cookie <= 1) | |
1359 | cookie = 2; | |
1360 | ||
1361 | /* initialize the completed cookie to be less than | |
1362 | * the most recently used cookie | |
1363 | */ | |
1364 | iop_chan->completed_cookie = cookie - 1; | |
1365 | iop_chan->common.cookie = sw_desc->async_tx.cookie = cookie; | |
1366 | ||
1367 | /* channel should not be busy */ | |
1368 | BUG_ON(iop_chan_is_busy(iop_chan)); | |
1369 | ||
1370 | /* clear any prior error-status bits */ | |
1371 | iop_adma_device_clear_err_status(iop_chan); | |
1372 | ||
1373 | /* disable operation */ | |
1374 | iop_chan_disable(iop_chan); | |
1375 | ||
1376 | /* set the descriptor address */ | |
1377 | iop_chan_set_next_descriptor(iop_chan, sw_desc->async_tx.phys); | |
1378 | ||
1379 | /* 1/ don't add pre-chained descriptors | |
1380 | * 2/ dummy read to flush next_desc write | |
1381 | */ | |
1382 | BUG_ON(iop_desc_get_next_desc(sw_desc)); | |
1383 | ||
1384 | /* run the descriptor */ | |
1385 | iop_chan_enable(iop_chan); | |
1386 | } else | |
1387 | dev_printk(KERN_ERR, iop_chan->device->common.dev, | |
1388 | "failed to allocate null descriptor\n"); | |
1389 | spin_unlock_bh(&iop_chan->lock); | |
1390 | } | |
1391 | ||
1392 | static struct platform_driver iop_adma_driver = { | |
1393 | .probe = iop_adma_probe, | |
1394 | .remove = iop_adma_remove, | |
1395 | .driver = { | |
1396 | .owner = THIS_MODULE, | |
1397 | .name = "iop-adma", | |
1398 | }, | |
1399 | }; | |
1400 | ||
1401 | static int __init iop_adma_init (void) | |
1402 | { | |
c2110923 DW |
1403 | return platform_driver_register(&iop_adma_driver); |
1404 | } | |
1405 | ||
af49d924 RR |
1406 | /* it's currently unsafe to unload this module */ |
1407 | #if 0 | |
c2110923 DW |
1408 | static void __exit iop_adma_exit (void) |
1409 | { | |
1410 | platform_driver_unregister(&iop_adma_driver); | |
1411 | return; | |
1412 | } | |
af49d924 RR |
1413 | module_exit(iop_adma_exit); |
1414 | #endif | |
c2110923 DW |
1415 | |
1416 | module_init(iop_adma_init); | |
c2110923 DW |
1417 | |
1418 | MODULE_AUTHOR("Intel Corporation"); | |
1419 | MODULE_DESCRIPTION("IOP ADMA Engine Driver"); | |
1420 | MODULE_LICENSE("GPL"); |