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ff7b0479 SB |
1 | /* |
2 | * offload engine driver for the Marvell XOR engine | |
3 | * Copyright (C) 2007, 2008, Marvell International Ltd. | |
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 | #include <linux/init.h> | |
20 | #include <linux/module.h> | |
5a0e3ad6 | 21 | #include <linux/slab.h> |
ff7b0479 SB |
22 | #include <linux/delay.h> |
23 | #include <linux/dma-mapping.h> | |
24 | #include <linux/spinlock.h> | |
25 | #include <linux/interrupt.h> | |
26 | #include <linux/platform_device.h> | |
27 | #include <linux/memory.h> | |
6f088f1d | 28 | #include <plat/mv_xor.h> |
ff7b0479 SB |
29 | #include "mv_xor.h" |
30 | ||
31 | static void mv_xor_issue_pending(struct dma_chan *chan); | |
32 | ||
33 | #define to_mv_xor_chan(chan) \ | |
34 | container_of(chan, struct mv_xor_chan, common) | |
35 | ||
36 | #define to_mv_xor_device(dev) \ | |
37 | container_of(dev, struct mv_xor_device, common) | |
38 | ||
39 | #define to_mv_xor_slot(tx) \ | |
40 | container_of(tx, struct mv_xor_desc_slot, async_tx) | |
41 | ||
42 | static void mv_desc_init(struct mv_xor_desc_slot *desc, unsigned long flags) | |
43 | { | |
44 | struct mv_xor_desc *hw_desc = desc->hw_desc; | |
45 | ||
46 | hw_desc->status = (1 << 31); | |
47 | hw_desc->phy_next_desc = 0; | |
48 | hw_desc->desc_command = (1 << 31); | |
49 | } | |
50 | ||
51 | static u32 mv_desc_get_dest_addr(struct mv_xor_desc_slot *desc) | |
52 | { | |
53 | struct mv_xor_desc *hw_desc = desc->hw_desc; | |
54 | return hw_desc->phy_dest_addr; | |
55 | } | |
56 | ||
57 | static u32 mv_desc_get_src_addr(struct mv_xor_desc_slot *desc, | |
58 | int src_idx) | |
59 | { | |
60 | struct mv_xor_desc *hw_desc = desc->hw_desc; | |
61 | return hw_desc->phy_src_addr[src_idx]; | |
62 | } | |
63 | ||
64 | ||
65 | static void mv_desc_set_byte_count(struct mv_xor_desc_slot *desc, | |
66 | u32 byte_count) | |
67 | { | |
68 | struct mv_xor_desc *hw_desc = desc->hw_desc; | |
69 | hw_desc->byte_count = byte_count; | |
70 | } | |
71 | ||
72 | static void mv_desc_set_next_desc(struct mv_xor_desc_slot *desc, | |
73 | u32 next_desc_addr) | |
74 | { | |
75 | struct mv_xor_desc *hw_desc = desc->hw_desc; | |
76 | BUG_ON(hw_desc->phy_next_desc); | |
77 | hw_desc->phy_next_desc = next_desc_addr; | |
78 | } | |
79 | ||
80 | static void mv_desc_clear_next_desc(struct mv_xor_desc_slot *desc) | |
81 | { | |
82 | struct mv_xor_desc *hw_desc = desc->hw_desc; | |
83 | hw_desc->phy_next_desc = 0; | |
84 | } | |
85 | ||
86 | static void mv_desc_set_block_fill_val(struct mv_xor_desc_slot *desc, u32 val) | |
87 | { | |
88 | desc->value = val; | |
89 | } | |
90 | ||
91 | static void mv_desc_set_dest_addr(struct mv_xor_desc_slot *desc, | |
92 | dma_addr_t addr) | |
93 | { | |
94 | struct mv_xor_desc *hw_desc = desc->hw_desc; | |
95 | hw_desc->phy_dest_addr = addr; | |
96 | } | |
97 | ||
98 | static int mv_chan_memset_slot_count(size_t len) | |
99 | { | |
100 | return 1; | |
101 | } | |
102 | ||
103 | #define mv_chan_memcpy_slot_count(c) mv_chan_memset_slot_count(c) | |
104 | ||
105 | static void mv_desc_set_src_addr(struct mv_xor_desc_slot *desc, | |
106 | int index, dma_addr_t addr) | |
107 | { | |
108 | struct mv_xor_desc *hw_desc = desc->hw_desc; | |
109 | hw_desc->phy_src_addr[index] = addr; | |
110 | if (desc->type == DMA_XOR) | |
111 | hw_desc->desc_command |= (1 << index); | |
112 | } | |
113 | ||
114 | static u32 mv_chan_get_current_desc(struct mv_xor_chan *chan) | |
115 | { | |
116 | return __raw_readl(XOR_CURR_DESC(chan)); | |
117 | } | |
118 | ||
119 | static void mv_chan_set_next_descriptor(struct mv_xor_chan *chan, | |
120 | u32 next_desc_addr) | |
121 | { | |
122 | __raw_writel(next_desc_addr, XOR_NEXT_DESC(chan)); | |
123 | } | |
124 | ||
125 | static void mv_chan_set_dest_pointer(struct mv_xor_chan *chan, u32 desc_addr) | |
126 | { | |
127 | __raw_writel(desc_addr, XOR_DEST_POINTER(chan)); | |
128 | } | |
129 | ||
130 | static void mv_chan_set_block_size(struct mv_xor_chan *chan, u32 block_size) | |
131 | { | |
132 | __raw_writel(block_size, XOR_BLOCK_SIZE(chan)); | |
133 | } | |
134 | ||
135 | static void mv_chan_set_value(struct mv_xor_chan *chan, u32 value) | |
136 | { | |
137 | __raw_writel(value, XOR_INIT_VALUE_LOW(chan)); | |
138 | __raw_writel(value, XOR_INIT_VALUE_HIGH(chan)); | |
139 | } | |
140 | ||
141 | static void mv_chan_unmask_interrupts(struct mv_xor_chan *chan) | |
142 | { | |
143 | u32 val = __raw_readl(XOR_INTR_MASK(chan)); | |
144 | val |= XOR_INTR_MASK_VALUE << (chan->idx * 16); | |
145 | __raw_writel(val, XOR_INTR_MASK(chan)); | |
146 | } | |
147 | ||
148 | static u32 mv_chan_get_intr_cause(struct mv_xor_chan *chan) | |
149 | { | |
150 | u32 intr_cause = __raw_readl(XOR_INTR_CAUSE(chan)); | |
151 | intr_cause = (intr_cause >> (chan->idx * 16)) & 0xFFFF; | |
152 | return intr_cause; | |
153 | } | |
154 | ||
155 | static int mv_is_err_intr(u32 intr_cause) | |
156 | { | |
157 | if (intr_cause & ((1<<4)|(1<<5)|(1<<6)|(1<<7)|(1<<8)|(1<<9))) | |
158 | return 1; | |
159 | ||
160 | return 0; | |
161 | } | |
162 | ||
163 | static void mv_xor_device_clear_eoc_cause(struct mv_xor_chan *chan) | |
164 | { | |
86363682 | 165 | u32 val = ~(1 << (chan->idx * 16)); |
ff7b0479 SB |
166 | dev_dbg(chan->device->common.dev, "%s, val 0x%08x\n", __func__, val); |
167 | __raw_writel(val, XOR_INTR_CAUSE(chan)); | |
168 | } | |
169 | ||
170 | static void mv_xor_device_clear_err_status(struct mv_xor_chan *chan) | |
171 | { | |
172 | u32 val = 0xFFFF0000 >> (chan->idx * 16); | |
173 | __raw_writel(val, XOR_INTR_CAUSE(chan)); | |
174 | } | |
175 | ||
176 | static int mv_can_chain(struct mv_xor_desc_slot *desc) | |
177 | { | |
178 | struct mv_xor_desc_slot *chain_old_tail = list_entry( | |
179 | desc->chain_node.prev, struct mv_xor_desc_slot, chain_node); | |
180 | ||
181 | if (chain_old_tail->type != desc->type) | |
182 | return 0; | |
183 | if (desc->type == DMA_MEMSET) | |
184 | return 0; | |
185 | ||
186 | return 1; | |
187 | } | |
188 | ||
189 | static void mv_set_mode(struct mv_xor_chan *chan, | |
190 | enum dma_transaction_type type) | |
191 | { | |
192 | u32 op_mode; | |
193 | u32 config = __raw_readl(XOR_CONFIG(chan)); | |
194 | ||
195 | switch (type) { | |
196 | case DMA_XOR: | |
197 | op_mode = XOR_OPERATION_MODE_XOR; | |
198 | break; | |
199 | case DMA_MEMCPY: | |
200 | op_mode = XOR_OPERATION_MODE_MEMCPY; | |
201 | break; | |
202 | case DMA_MEMSET: | |
203 | op_mode = XOR_OPERATION_MODE_MEMSET; | |
204 | break; | |
205 | default: | |
206 | dev_printk(KERN_ERR, chan->device->common.dev, | |
207 | "error: unsupported operation %d.\n", | |
208 | type); | |
209 | BUG(); | |
210 | return; | |
211 | } | |
212 | ||
213 | config &= ~0x7; | |
214 | config |= op_mode; | |
215 | __raw_writel(config, XOR_CONFIG(chan)); | |
216 | chan->current_type = type; | |
217 | } | |
218 | ||
219 | static void mv_chan_activate(struct mv_xor_chan *chan) | |
220 | { | |
221 | u32 activation; | |
222 | ||
223 | dev_dbg(chan->device->common.dev, " activate chan.\n"); | |
224 | activation = __raw_readl(XOR_ACTIVATION(chan)); | |
225 | activation |= 0x1; | |
226 | __raw_writel(activation, XOR_ACTIVATION(chan)); | |
227 | } | |
228 | ||
229 | static char mv_chan_is_busy(struct mv_xor_chan *chan) | |
230 | { | |
231 | u32 state = __raw_readl(XOR_ACTIVATION(chan)); | |
232 | ||
233 | state = (state >> 4) & 0x3; | |
234 | ||
235 | return (state == 1) ? 1 : 0; | |
236 | } | |
237 | ||
238 | static int mv_chan_xor_slot_count(size_t len, int src_cnt) | |
239 | { | |
240 | return 1; | |
241 | } | |
242 | ||
243 | /** | |
244 | * mv_xor_free_slots - flags descriptor slots for reuse | |
245 | * @slot: Slot to free | |
246 | * Caller must hold &mv_chan->lock while calling this function | |
247 | */ | |
248 | static void mv_xor_free_slots(struct mv_xor_chan *mv_chan, | |
249 | struct mv_xor_desc_slot *slot) | |
250 | { | |
251 | dev_dbg(mv_chan->device->common.dev, "%s %d slot %p\n", | |
252 | __func__, __LINE__, slot); | |
253 | ||
254 | slot->slots_per_op = 0; | |
255 | ||
256 | } | |
257 | ||
258 | /* | |
259 | * mv_xor_start_new_chain - program the engine to operate on new chain headed by | |
260 | * sw_desc | |
261 | * Caller must hold &mv_chan->lock while calling this function | |
262 | */ | |
263 | static void mv_xor_start_new_chain(struct mv_xor_chan *mv_chan, | |
264 | struct mv_xor_desc_slot *sw_desc) | |
265 | { | |
266 | dev_dbg(mv_chan->device->common.dev, "%s %d: sw_desc %p\n", | |
267 | __func__, __LINE__, sw_desc); | |
268 | if (sw_desc->type != mv_chan->current_type) | |
269 | mv_set_mode(mv_chan, sw_desc->type); | |
270 | ||
271 | if (sw_desc->type == DMA_MEMSET) { | |
272 | /* for memset requests we need to program the engine, no | |
273 | * descriptors used. | |
274 | */ | |
275 | struct mv_xor_desc *hw_desc = sw_desc->hw_desc; | |
276 | mv_chan_set_dest_pointer(mv_chan, hw_desc->phy_dest_addr); | |
277 | mv_chan_set_block_size(mv_chan, sw_desc->unmap_len); | |
278 | mv_chan_set_value(mv_chan, sw_desc->value); | |
279 | } else { | |
280 | /* set the hardware chain */ | |
281 | mv_chan_set_next_descriptor(mv_chan, sw_desc->async_tx.phys); | |
282 | } | |
283 | mv_chan->pending += sw_desc->slot_cnt; | |
284 | mv_xor_issue_pending(&mv_chan->common); | |
285 | } | |
286 | ||
287 | static dma_cookie_t | |
288 | mv_xor_run_tx_complete_actions(struct mv_xor_desc_slot *desc, | |
289 | struct mv_xor_chan *mv_chan, dma_cookie_t cookie) | |
290 | { | |
291 | BUG_ON(desc->async_tx.cookie < 0); | |
292 | ||
293 | if (desc->async_tx.cookie > 0) { | |
294 | cookie = desc->async_tx.cookie; | |
295 | ||
296 | /* call the callback (must not sleep or submit new | |
297 | * operations to this channel) | |
298 | */ | |
299 | if (desc->async_tx.callback) | |
300 | desc->async_tx.callback( | |
301 | desc->async_tx.callback_param); | |
302 | ||
303 | /* unmap dma addresses | |
304 | * (unmap_single vs unmap_page?) | |
305 | */ | |
306 | if (desc->group_head && desc->unmap_len) { | |
307 | struct mv_xor_desc_slot *unmap = desc->group_head; | |
308 | struct device *dev = | |
309 | &mv_chan->device->pdev->dev; | |
310 | u32 len = unmap->unmap_len; | |
e1d181ef DW |
311 | enum dma_ctrl_flags flags = desc->async_tx.flags; |
312 | u32 src_cnt; | |
313 | dma_addr_t addr; | |
a06d568f | 314 | dma_addr_t dest; |
ff7b0479 | 315 | |
a06d568f DW |
316 | src_cnt = unmap->unmap_src_cnt; |
317 | dest = mv_desc_get_dest_addr(unmap); | |
e1d181ef | 318 | if (!(flags & DMA_COMPL_SKIP_DEST_UNMAP)) { |
a06d568f DW |
319 | enum dma_data_direction dir; |
320 | ||
321 | if (src_cnt > 1) /* is xor ? */ | |
322 | dir = DMA_BIDIRECTIONAL; | |
323 | else | |
324 | dir = DMA_FROM_DEVICE; | |
325 | dma_unmap_page(dev, dest, len, dir); | |
e1d181ef DW |
326 | } |
327 | ||
328 | if (!(flags & DMA_COMPL_SKIP_SRC_UNMAP)) { | |
e1d181ef DW |
329 | while (src_cnt--) { |
330 | addr = mv_desc_get_src_addr(unmap, | |
331 | src_cnt); | |
a06d568f DW |
332 | if (addr == dest) |
333 | continue; | |
e1d181ef DW |
334 | dma_unmap_page(dev, addr, len, |
335 | DMA_TO_DEVICE); | |
336 | } | |
ff7b0479 SB |
337 | } |
338 | desc->group_head = NULL; | |
339 | } | |
340 | } | |
341 | ||
342 | /* run dependent operations */ | |
07f2211e | 343 | dma_run_dependencies(&desc->async_tx); |
ff7b0479 SB |
344 | |
345 | return cookie; | |
346 | } | |
347 | ||
348 | static int | |
349 | mv_xor_clean_completed_slots(struct mv_xor_chan *mv_chan) | |
350 | { | |
351 | struct mv_xor_desc_slot *iter, *_iter; | |
352 | ||
353 | dev_dbg(mv_chan->device->common.dev, "%s %d\n", __func__, __LINE__); | |
354 | list_for_each_entry_safe(iter, _iter, &mv_chan->completed_slots, | |
355 | completed_node) { | |
356 | ||
357 | if (async_tx_test_ack(&iter->async_tx)) { | |
358 | list_del(&iter->completed_node); | |
359 | mv_xor_free_slots(mv_chan, iter); | |
360 | } | |
361 | } | |
362 | return 0; | |
363 | } | |
364 | ||
365 | static int | |
366 | mv_xor_clean_slot(struct mv_xor_desc_slot *desc, | |
367 | struct mv_xor_chan *mv_chan) | |
368 | { | |
369 | dev_dbg(mv_chan->device->common.dev, "%s %d: desc %p flags %d\n", | |
370 | __func__, __LINE__, desc, desc->async_tx.flags); | |
371 | list_del(&desc->chain_node); | |
372 | /* the client is allowed to attach dependent operations | |
373 | * until 'ack' is set | |
374 | */ | |
375 | if (!async_tx_test_ack(&desc->async_tx)) { | |
376 | /* move this slot to the completed_slots */ | |
377 | list_add_tail(&desc->completed_node, &mv_chan->completed_slots); | |
378 | return 0; | |
379 | } | |
380 | ||
381 | mv_xor_free_slots(mv_chan, desc); | |
382 | return 0; | |
383 | } | |
384 | ||
385 | static void __mv_xor_slot_cleanup(struct mv_xor_chan *mv_chan) | |
386 | { | |
387 | struct mv_xor_desc_slot *iter, *_iter; | |
388 | dma_cookie_t cookie = 0; | |
389 | int busy = mv_chan_is_busy(mv_chan); | |
390 | u32 current_desc = mv_chan_get_current_desc(mv_chan); | |
391 | int seen_current = 0; | |
392 | ||
393 | dev_dbg(mv_chan->device->common.dev, "%s %d\n", __func__, __LINE__); | |
394 | dev_dbg(mv_chan->device->common.dev, "current_desc %x\n", current_desc); | |
395 | mv_xor_clean_completed_slots(mv_chan); | |
396 | ||
397 | /* free completed slots from the chain starting with | |
398 | * the oldest descriptor | |
399 | */ | |
400 | ||
401 | list_for_each_entry_safe(iter, _iter, &mv_chan->chain, | |
402 | chain_node) { | |
403 | prefetch(_iter); | |
404 | prefetch(&_iter->async_tx); | |
405 | ||
406 | /* do not advance past the current descriptor loaded into the | |
407 | * hardware channel, subsequent descriptors are either in | |
408 | * process or have not been submitted | |
409 | */ | |
410 | if (seen_current) | |
411 | break; | |
412 | ||
413 | /* stop the search if we reach the current descriptor and the | |
414 | * channel is busy | |
415 | */ | |
416 | if (iter->async_tx.phys == current_desc) { | |
417 | seen_current = 1; | |
418 | if (busy) | |
419 | break; | |
420 | } | |
421 | ||
422 | cookie = mv_xor_run_tx_complete_actions(iter, mv_chan, cookie); | |
423 | ||
424 | if (mv_xor_clean_slot(iter, mv_chan)) | |
425 | break; | |
426 | } | |
427 | ||
428 | if ((busy == 0) && !list_empty(&mv_chan->chain)) { | |
429 | struct mv_xor_desc_slot *chain_head; | |
430 | chain_head = list_entry(mv_chan->chain.next, | |
431 | struct mv_xor_desc_slot, | |
432 | chain_node); | |
433 | ||
434 | mv_xor_start_new_chain(mv_chan, chain_head); | |
435 | } | |
436 | ||
437 | if (cookie > 0) | |
438 | mv_chan->completed_cookie = cookie; | |
439 | } | |
440 | ||
441 | static void | |
442 | mv_xor_slot_cleanup(struct mv_xor_chan *mv_chan) | |
443 | { | |
444 | spin_lock_bh(&mv_chan->lock); | |
445 | __mv_xor_slot_cleanup(mv_chan); | |
446 | spin_unlock_bh(&mv_chan->lock); | |
447 | } | |
448 | ||
449 | static void mv_xor_tasklet(unsigned long data) | |
450 | { | |
451 | struct mv_xor_chan *chan = (struct mv_xor_chan *) data; | |
8333f65e | 452 | mv_xor_slot_cleanup(chan); |
ff7b0479 SB |
453 | } |
454 | ||
455 | static struct mv_xor_desc_slot * | |
456 | mv_xor_alloc_slots(struct mv_xor_chan *mv_chan, int num_slots, | |
457 | int slots_per_op) | |
458 | { | |
459 | struct mv_xor_desc_slot *iter, *_iter, *alloc_start = NULL; | |
460 | LIST_HEAD(chain); | |
461 | int slots_found, retry = 0; | |
462 | ||
463 | /* start search from the last allocated descrtiptor | |
464 | * if a contiguous allocation can not be found start searching | |
465 | * from the beginning of the list | |
466 | */ | |
467 | retry: | |
468 | slots_found = 0; | |
469 | if (retry == 0) | |
470 | iter = mv_chan->last_used; | |
471 | else | |
472 | iter = list_entry(&mv_chan->all_slots, | |
473 | struct mv_xor_desc_slot, | |
474 | slot_node); | |
475 | ||
476 | list_for_each_entry_safe_continue( | |
477 | iter, _iter, &mv_chan->all_slots, slot_node) { | |
478 | prefetch(_iter); | |
479 | prefetch(&_iter->async_tx); | |
480 | if (iter->slots_per_op) { | |
481 | /* give up after finding the first busy slot | |
482 | * on the second pass through the list | |
483 | */ | |
484 | if (retry) | |
485 | break; | |
486 | ||
487 | slots_found = 0; | |
488 | continue; | |
489 | } | |
490 | ||
491 | /* start the allocation if the slot is correctly aligned */ | |
492 | if (!slots_found++) | |
493 | alloc_start = iter; | |
494 | ||
495 | if (slots_found == num_slots) { | |
496 | struct mv_xor_desc_slot *alloc_tail = NULL; | |
497 | struct mv_xor_desc_slot *last_used = NULL; | |
498 | iter = alloc_start; | |
499 | while (num_slots) { | |
500 | int i; | |
501 | ||
502 | /* pre-ack all but the last descriptor */ | |
503 | async_tx_ack(&iter->async_tx); | |
504 | ||
505 | list_add_tail(&iter->chain_node, &chain); | |
506 | alloc_tail = iter; | |
507 | iter->async_tx.cookie = 0; | |
508 | iter->slot_cnt = num_slots; | |
509 | iter->xor_check_result = NULL; | |
510 | for (i = 0; i < slots_per_op; i++) { | |
511 | iter->slots_per_op = slots_per_op - i; | |
512 | last_used = iter; | |
513 | iter = list_entry(iter->slot_node.next, | |
514 | struct mv_xor_desc_slot, | |
515 | slot_node); | |
516 | } | |
517 | num_slots -= slots_per_op; | |
518 | } | |
519 | alloc_tail->group_head = alloc_start; | |
520 | alloc_tail->async_tx.cookie = -EBUSY; | |
64203b67 | 521 | list_splice(&chain, &alloc_tail->tx_list); |
ff7b0479 SB |
522 | mv_chan->last_used = last_used; |
523 | mv_desc_clear_next_desc(alloc_start); | |
524 | mv_desc_clear_next_desc(alloc_tail); | |
525 | return alloc_tail; | |
526 | } | |
527 | } | |
528 | if (!retry++) | |
529 | goto retry; | |
530 | ||
531 | /* try to free some slots if the allocation fails */ | |
532 | tasklet_schedule(&mv_chan->irq_tasklet); | |
533 | ||
534 | return NULL; | |
535 | } | |
536 | ||
537 | static dma_cookie_t | |
538 | mv_desc_assign_cookie(struct mv_xor_chan *mv_chan, | |
539 | struct mv_xor_desc_slot *desc) | |
540 | { | |
541 | dma_cookie_t cookie = mv_chan->common.cookie; | |
542 | ||
543 | if (++cookie < 0) | |
544 | cookie = 1; | |
545 | mv_chan->common.cookie = desc->async_tx.cookie = cookie; | |
546 | return cookie; | |
547 | } | |
548 | ||
549 | /************************ DMA engine API functions ****************************/ | |
550 | static dma_cookie_t | |
551 | mv_xor_tx_submit(struct dma_async_tx_descriptor *tx) | |
552 | { | |
553 | struct mv_xor_desc_slot *sw_desc = to_mv_xor_slot(tx); | |
554 | struct mv_xor_chan *mv_chan = to_mv_xor_chan(tx->chan); | |
555 | struct mv_xor_desc_slot *grp_start, *old_chain_tail; | |
556 | dma_cookie_t cookie; | |
557 | int new_hw_chain = 1; | |
558 | ||
559 | dev_dbg(mv_chan->device->common.dev, | |
560 | "%s sw_desc %p: async_tx %p\n", | |
561 | __func__, sw_desc, &sw_desc->async_tx); | |
562 | ||
563 | grp_start = sw_desc->group_head; | |
564 | ||
565 | spin_lock_bh(&mv_chan->lock); | |
566 | cookie = mv_desc_assign_cookie(mv_chan, sw_desc); | |
567 | ||
568 | if (list_empty(&mv_chan->chain)) | |
64203b67 | 569 | list_splice_init(&sw_desc->tx_list, &mv_chan->chain); |
ff7b0479 SB |
570 | else { |
571 | new_hw_chain = 0; | |
572 | ||
573 | old_chain_tail = list_entry(mv_chan->chain.prev, | |
574 | struct mv_xor_desc_slot, | |
575 | chain_node); | |
64203b67 | 576 | list_splice_init(&grp_start->tx_list, |
ff7b0479 SB |
577 | &old_chain_tail->chain_node); |
578 | ||
579 | if (!mv_can_chain(grp_start)) | |
580 | goto submit_done; | |
581 | ||
582 | dev_dbg(mv_chan->device->common.dev, "Append to last desc %x\n", | |
583 | old_chain_tail->async_tx.phys); | |
584 | ||
585 | /* fix up the hardware chain */ | |
586 | mv_desc_set_next_desc(old_chain_tail, grp_start->async_tx.phys); | |
587 | ||
588 | /* if the channel is not busy */ | |
589 | if (!mv_chan_is_busy(mv_chan)) { | |
590 | u32 current_desc = mv_chan_get_current_desc(mv_chan); | |
591 | /* | |
592 | * and the curren desc is the end of the chain before | |
593 | * the append, then we need to start the channel | |
594 | */ | |
595 | if (current_desc == old_chain_tail->async_tx.phys) | |
596 | new_hw_chain = 1; | |
597 | } | |
598 | } | |
599 | ||
600 | if (new_hw_chain) | |
601 | mv_xor_start_new_chain(mv_chan, grp_start); | |
602 | ||
603 | submit_done: | |
604 | spin_unlock_bh(&mv_chan->lock); | |
605 | ||
606 | return cookie; | |
607 | } | |
608 | ||
609 | /* returns the number of allocated descriptors */ | |
aa1e6f1a | 610 | static int mv_xor_alloc_chan_resources(struct dma_chan *chan) |
ff7b0479 SB |
611 | { |
612 | char *hw_desc; | |
613 | int idx; | |
614 | struct mv_xor_chan *mv_chan = to_mv_xor_chan(chan); | |
615 | struct mv_xor_desc_slot *slot = NULL; | |
616 | struct mv_xor_platform_data *plat_data = | |
617 | mv_chan->device->pdev->dev.platform_data; | |
618 | int num_descs_in_pool = plat_data->pool_size/MV_XOR_SLOT_SIZE; | |
619 | ||
620 | /* Allocate descriptor slots */ | |
621 | idx = mv_chan->slots_allocated; | |
622 | while (idx < num_descs_in_pool) { | |
623 | slot = kzalloc(sizeof(*slot), GFP_KERNEL); | |
624 | if (!slot) { | |
625 | printk(KERN_INFO "MV XOR Channel only initialized" | |
626 | " %d descriptor slots", idx); | |
627 | break; | |
628 | } | |
629 | hw_desc = (char *) mv_chan->device->dma_desc_pool_virt; | |
630 | slot->hw_desc = (void *) &hw_desc[idx * MV_XOR_SLOT_SIZE]; | |
631 | ||
632 | dma_async_tx_descriptor_init(&slot->async_tx, chan); | |
633 | slot->async_tx.tx_submit = mv_xor_tx_submit; | |
634 | INIT_LIST_HEAD(&slot->chain_node); | |
635 | INIT_LIST_HEAD(&slot->slot_node); | |
64203b67 | 636 | INIT_LIST_HEAD(&slot->tx_list); |
ff7b0479 SB |
637 | hw_desc = (char *) mv_chan->device->dma_desc_pool; |
638 | slot->async_tx.phys = | |
639 | (dma_addr_t) &hw_desc[idx * MV_XOR_SLOT_SIZE]; | |
640 | slot->idx = idx++; | |
641 | ||
642 | spin_lock_bh(&mv_chan->lock); | |
643 | mv_chan->slots_allocated = idx; | |
644 | list_add_tail(&slot->slot_node, &mv_chan->all_slots); | |
645 | spin_unlock_bh(&mv_chan->lock); | |
646 | } | |
647 | ||
648 | if (mv_chan->slots_allocated && !mv_chan->last_used) | |
649 | mv_chan->last_used = list_entry(mv_chan->all_slots.next, | |
650 | struct mv_xor_desc_slot, | |
651 | slot_node); | |
652 | ||
653 | dev_dbg(mv_chan->device->common.dev, | |
654 | "allocated %d descriptor slots last_used: %p\n", | |
655 | mv_chan->slots_allocated, mv_chan->last_used); | |
656 | ||
657 | return mv_chan->slots_allocated ? : -ENOMEM; | |
658 | } | |
659 | ||
660 | static struct dma_async_tx_descriptor * | |
661 | mv_xor_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src, | |
662 | size_t len, unsigned long flags) | |
663 | { | |
664 | struct mv_xor_chan *mv_chan = to_mv_xor_chan(chan); | |
665 | struct mv_xor_desc_slot *sw_desc, *grp_start; | |
666 | int slot_cnt; | |
667 | ||
668 | dev_dbg(mv_chan->device->common.dev, | |
669 | "%s dest: %x src %x len: %u flags: %ld\n", | |
670 | __func__, dest, src, len, flags); | |
671 | if (unlikely(len < MV_XOR_MIN_BYTE_COUNT)) | |
672 | return NULL; | |
673 | ||
7912d300 | 674 | BUG_ON(len > MV_XOR_MAX_BYTE_COUNT); |
ff7b0479 SB |
675 | |
676 | spin_lock_bh(&mv_chan->lock); | |
677 | slot_cnt = mv_chan_memcpy_slot_count(len); | |
678 | sw_desc = mv_xor_alloc_slots(mv_chan, slot_cnt, 1); | |
679 | if (sw_desc) { | |
680 | sw_desc->type = DMA_MEMCPY; | |
681 | sw_desc->async_tx.flags = flags; | |
682 | grp_start = sw_desc->group_head; | |
683 | mv_desc_init(grp_start, flags); | |
684 | mv_desc_set_byte_count(grp_start, len); | |
685 | mv_desc_set_dest_addr(sw_desc->group_head, dest); | |
686 | mv_desc_set_src_addr(grp_start, 0, src); | |
687 | sw_desc->unmap_src_cnt = 1; | |
688 | sw_desc->unmap_len = len; | |
689 | } | |
690 | spin_unlock_bh(&mv_chan->lock); | |
691 | ||
692 | dev_dbg(mv_chan->device->common.dev, | |
693 | "%s sw_desc %p async_tx %p\n", | |
694 | __func__, sw_desc, sw_desc ? &sw_desc->async_tx : 0); | |
695 | ||
696 | return sw_desc ? &sw_desc->async_tx : NULL; | |
697 | } | |
698 | ||
699 | static struct dma_async_tx_descriptor * | |
700 | mv_xor_prep_dma_memset(struct dma_chan *chan, dma_addr_t dest, int value, | |
701 | size_t len, unsigned long flags) | |
702 | { | |
703 | struct mv_xor_chan *mv_chan = to_mv_xor_chan(chan); | |
704 | struct mv_xor_desc_slot *sw_desc, *grp_start; | |
705 | int slot_cnt; | |
706 | ||
707 | dev_dbg(mv_chan->device->common.dev, | |
708 | "%s dest: %x len: %u flags: %ld\n", | |
709 | __func__, dest, len, flags); | |
710 | if (unlikely(len < MV_XOR_MIN_BYTE_COUNT)) | |
711 | return NULL; | |
712 | ||
7912d300 | 713 | BUG_ON(len > MV_XOR_MAX_BYTE_COUNT); |
ff7b0479 SB |
714 | |
715 | spin_lock_bh(&mv_chan->lock); | |
716 | slot_cnt = mv_chan_memset_slot_count(len); | |
717 | sw_desc = mv_xor_alloc_slots(mv_chan, slot_cnt, 1); | |
718 | if (sw_desc) { | |
719 | sw_desc->type = DMA_MEMSET; | |
720 | sw_desc->async_tx.flags = flags; | |
721 | grp_start = sw_desc->group_head; | |
722 | mv_desc_init(grp_start, flags); | |
723 | mv_desc_set_byte_count(grp_start, len); | |
724 | mv_desc_set_dest_addr(sw_desc->group_head, dest); | |
725 | mv_desc_set_block_fill_val(grp_start, value); | |
726 | sw_desc->unmap_src_cnt = 1; | |
727 | sw_desc->unmap_len = len; | |
728 | } | |
729 | spin_unlock_bh(&mv_chan->lock); | |
730 | dev_dbg(mv_chan->device->common.dev, | |
731 | "%s sw_desc %p async_tx %p \n", | |
732 | __func__, sw_desc, &sw_desc->async_tx); | |
733 | return sw_desc ? &sw_desc->async_tx : NULL; | |
734 | } | |
735 | ||
736 | static struct dma_async_tx_descriptor * | |
737 | mv_xor_prep_dma_xor(struct dma_chan *chan, dma_addr_t dest, dma_addr_t *src, | |
738 | unsigned int src_cnt, size_t len, unsigned long flags) | |
739 | { | |
740 | struct mv_xor_chan *mv_chan = to_mv_xor_chan(chan); | |
741 | struct mv_xor_desc_slot *sw_desc, *grp_start; | |
742 | int slot_cnt; | |
743 | ||
744 | if (unlikely(len < MV_XOR_MIN_BYTE_COUNT)) | |
745 | return NULL; | |
746 | ||
7912d300 | 747 | BUG_ON(len > MV_XOR_MAX_BYTE_COUNT); |
ff7b0479 SB |
748 | |
749 | dev_dbg(mv_chan->device->common.dev, | |
750 | "%s src_cnt: %d len: dest %x %u flags: %ld\n", | |
751 | __func__, src_cnt, len, dest, flags); | |
752 | ||
753 | spin_lock_bh(&mv_chan->lock); | |
754 | slot_cnt = mv_chan_xor_slot_count(len, src_cnt); | |
755 | sw_desc = mv_xor_alloc_slots(mv_chan, slot_cnt, 1); | |
756 | if (sw_desc) { | |
757 | sw_desc->type = DMA_XOR; | |
758 | sw_desc->async_tx.flags = flags; | |
759 | grp_start = sw_desc->group_head; | |
760 | mv_desc_init(grp_start, flags); | |
761 | /* the byte count field is the same as in memcpy desc*/ | |
762 | mv_desc_set_byte_count(grp_start, len); | |
763 | mv_desc_set_dest_addr(sw_desc->group_head, dest); | |
764 | sw_desc->unmap_src_cnt = src_cnt; | |
765 | sw_desc->unmap_len = len; | |
766 | while (src_cnt--) | |
767 | mv_desc_set_src_addr(grp_start, src_cnt, src[src_cnt]); | |
768 | } | |
769 | spin_unlock_bh(&mv_chan->lock); | |
770 | dev_dbg(mv_chan->device->common.dev, | |
771 | "%s sw_desc %p async_tx %p \n", | |
772 | __func__, sw_desc, &sw_desc->async_tx); | |
773 | return sw_desc ? &sw_desc->async_tx : NULL; | |
774 | } | |
775 | ||
776 | static void mv_xor_free_chan_resources(struct dma_chan *chan) | |
777 | { | |
778 | struct mv_xor_chan *mv_chan = to_mv_xor_chan(chan); | |
779 | struct mv_xor_desc_slot *iter, *_iter; | |
780 | int in_use_descs = 0; | |
781 | ||
782 | mv_xor_slot_cleanup(mv_chan); | |
783 | ||
784 | spin_lock_bh(&mv_chan->lock); | |
785 | list_for_each_entry_safe(iter, _iter, &mv_chan->chain, | |
786 | chain_node) { | |
787 | in_use_descs++; | |
788 | list_del(&iter->chain_node); | |
789 | } | |
790 | list_for_each_entry_safe(iter, _iter, &mv_chan->completed_slots, | |
791 | completed_node) { | |
792 | in_use_descs++; | |
793 | list_del(&iter->completed_node); | |
794 | } | |
795 | list_for_each_entry_safe_reverse( | |
796 | iter, _iter, &mv_chan->all_slots, slot_node) { | |
797 | list_del(&iter->slot_node); | |
798 | kfree(iter); | |
799 | mv_chan->slots_allocated--; | |
800 | } | |
801 | mv_chan->last_used = NULL; | |
802 | ||
803 | dev_dbg(mv_chan->device->common.dev, "%s slots_allocated %d\n", | |
804 | __func__, mv_chan->slots_allocated); | |
805 | spin_unlock_bh(&mv_chan->lock); | |
806 | ||
807 | if (in_use_descs) | |
808 | dev_err(mv_chan->device->common.dev, | |
809 | "freeing %d in use descriptors!\n", in_use_descs); | |
810 | } | |
811 | ||
812 | /** | |
07934481 | 813 | * mv_xor_status - poll the status of an XOR transaction |
ff7b0479 SB |
814 | * @chan: XOR channel handle |
815 | * @cookie: XOR transaction identifier | |
07934481 | 816 | * @txstate: XOR transactions state holder (or NULL) |
ff7b0479 | 817 | */ |
07934481 | 818 | static enum dma_status mv_xor_status(struct dma_chan *chan, |
ff7b0479 | 819 | dma_cookie_t cookie, |
07934481 | 820 | struct dma_tx_state *txstate) |
ff7b0479 SB |
821 | { |
822 | struct mv_xor_chan *mv_chan = to_mv_xor_chan(chan); | |
823 | dma_cookie_t last_used; | |
824 | dma_cookie_t last_complete; | |
825 | enum dma_status ret; | |
826 | ||
827 | last_used = chan->cookie; | |
828 | last_complete = mv_chan->completed_cookie; | |
829 | mv_chan->is_complete_cookie = cookie; | |
bca34692 | 830 | dma_set_tx_state(txstate, last_complete, last_used, 0); |
ff7b0479 SB |
831 | |
832 | ret = dma_async_is_complete(cookie, last_complete, last_used); | |
833 | if (ret == DMA_SUCCESS) { | |
834 | mv_xor_clean_completed_slots(mv_chan); | |
835 | return ret; | |
836 | } | |
837 | mv_xor_slot_cleanup(mv_chan); | |
838 | ||
839 | last_used = chan->cookie; | |
840 | last_complete = mv_chan->completed_cookie; | |
841 | ||
bca34692 | 842 | dma_set_tx_state(txstate, last_complete, last_used, 0); |
ff7b0479 SB |
843 | return dma_async_is_complete(cookie, last_complete, last_used); |
844 | } | |
845 | ||
846 | static void mv_dump_xor_regs(struct mv_xor_chan *chan) | |
847 | { | |
848 | u32 val; | |
849 | ||
850 | val = __raw_readl(XOR_CONFIG(chan)); | |
851 | dev_printk(KERN_ERR, chan->device->common.dev, | |
852 | "config 0x%08x.\n", val); | |
853 | ||
854 | val = __raw_readl(XOR_ACTIVATION(chan)); | |
855 | dev_printk(KERN_ERR, chan->device->common.dev, | |
856 | "activation 0x%08x.\n", val); | |
857 | ||
858 | val = __raw_readl(XOR_INTR_CAUSE(chan)); | |
859 | dev_printk(KERN_ERR, chan->device->common.dev, | |
860 | "intr cause 0x%08x.\n", val); | |
861 | ||
862 | val = __raw_readl(XOR_INTR_MASK(chan)); | |
863 | dev_printk(KERN_ERR, chan->device->common.dev, | |
864 | "intr mask 0x%08x.\n", val); | |
865 | ||
866 | val = __raw_readl(XOR_ERROR_CAUSE(chan)); | |
867 | dev_printk(KERN_ERR, chan->device->common.dev, | |
868 | "error cause 0x%08x.\n", val); | |
869 | ||
870 | val = __raw_readl(XOR_ERROR_ADDR(chan)); | |
871 | dev_printk(KERN_ERR, chan->device->common.dev, | |
872 | "error addr 0x%08x.\n", val); | |
873 | } | |
874 | ||
875 | static void mv_xor_err_interrupt_handler(struct mv_xor_chan *chan, | |
876 | u32 intr_cause) | |
877 | { | |
878 | if (intr_cause & (1 << 4)) { | |
879 | dev_dbg(chan->device->common.dev, | |
880 | "ignore this error\n"); | |
881 | return; | |
882 | } | |
883 | ||
884 | dev_printk(KERN_ERR, chan->device->common.dev, | |
885 | "error on chan %d. intr cause 0x%08x.\n", | |
886 | chan->idx, intr_cause); | |
887 | ||
888 | mv_dump_xor_regs(chan); | |
889 | BUG(); | |
890 | } | |
891 | ||
892 | static irqreturn_t mv_xor_interrupt_handler(int irq, void *data) | |
893 | { | |
894 | struct mv_xor_chan *chan = data; | |
895 | u32 intr_cause = mv_chan_get_intr_cause(chan); | |
896 | ||
897 | dev_dbg(chan->device->common.dev, "intr cause %x\n", intr_cause); | |
898 | ||
899 | if (mv_is_err_intr(intr_cause)) | |
900 | mv_xor_err_interrupt_handler(chan, intr_cause); | |
901 | ||
902 | tasklet_schedule(&chan->irq_tasklet); | |
903 | ||
904 | mv_xor_device_clear_eoc_cause(chan); | |
905 | ||
906 | return IRQ_HANDLED; | |
907 | } | |
908 | ||
909 | static void mv_xor_issue_pending(struct dma_chan *chan) | |
910 | { | |
911 | struct mv_xor_chan *mv_chan = to_mv_xor_chan(chan); | |
912 | ||
913 | if (mv_chan->pending >= MV_XOR_THRESHOLD) { | |
914 | mv_chan->pending = 0; | |
915 | mv_chan_activate(mv_chan); | |
916 | } | |
917 | } | |
918 | ||
919 | /* | |
920 | * Perform a transaction to verify the HW works. | |
921 | */ | |
922 | #define MV_XOR_TEST_SIZE 2000 | |
923 | ||
924 | static int __devinit mv_xor_memcpy_self_test(struct mv_xor_device *device) | |
925 | { | |
926 | int i; | |
927 | void *src, *dest; | |
928 | dma_addr_t src_dma, dest_dma; | |
929 | struct dma_chan *dma_chan; | |
930 | dma_cookie_t cookie; | |
931 | struct dma_async_tx_descriptor *tx; | |
932 | int err = 0; | |
933 | struct mv_xor_chan *mv_chan; | |
934 | ||
935 | src = kmalloc(sizeof(u8) * MV_XOR_TEST_SIZE, GFP_KERNEL); | |
936 | if (!src) | |
937 | return -ENOMEM; | |
938 | ||
939 | dest = kzalloc(sizeof(u8) * MV_XOR_TEST_SIZE, GFP_KERNEL); | |
940 | if (!dest) { | |
941 | kfree(src); | |
942 | return -ENOMEM; | |
943 | } | |
944 | ||
945 | /* Fill in src buffer */ | |
946 | for (i = 0; i < MV_XOR_TEST_SIZE; i++) | |
947 | ((u8 *) src)[i] = (u8)i; | |
948 | ||
949 | /* Start copy, using first DMA channel */ | |
950 | dma_chan = container_of(device->common.channels.next, | |
951 | struct dma_chan, | |
952 | device_node); | |
aa1e6f1a | 953 | if (mv_xor_alloc_chan_resources(dma_chan) < 1) { |
ff7b0479 SB |
954 | err = -ENODEV; |
955 | goto out; | |
956 | } | |
957 | ||
958 | dest_dma = dma_map_single(dma_chan->device->dev, dest, | |
959 | MV_XOR_TEST_SIZE, DMA_FROM_DEVICE); | |
960 | ||
961 | src_dma = dma_map_single(dma_chan->device->dev, src, | |
962 | MV_XOR_TEST_SIZE, DMA_TO_DEVICE); | |
963 | ||
964 | tx = mv_xor_prep_dma_memcpy(dma_chan, dest_dma, src_dma, | |
965 | MV_XOR_TEST_SIZE, 0); | |
966 | cookie = mv_xor_tx_submit(tx); | |
967 | mv_xor_issue_pending(dma_chan); | |
968 | async_tx_ack(tx); | |
969 | msleep(1); | |
970 | ||
07934481 | 971 | if (mv_xor_status(dma_chan, cookie, NULL) != |
ff7b0479 SB |
972 | DMA_SUCCESS) { |
973 | dev_printk(KERN_ERR, dma_chan->device->dev, | |
974 | "Self-test copy timed out, disabling\n"); | |
975 | err = -ENODEV; | |
976 | goto free_resources; | |
977 | } | |
978 | ||
979 | mv_chan = to_mv_xor_chan(dma_chan); | |
980 | dma_sync_single_for_cpu(&mv_chan->device->pdev->dev, dest_dma, | |
981 | MV_XOR_TEST_SIZE, DMA_FROM_DEVICE); | |
982 | if (memcmp(src, dest, MV_XOR_TEST_SIZE)) { | |
983 | dev_printk(KERN_ERR, dma_chan->device->dev, | |
984 | "Self-test copy failed compare, disabling\n"); | |
985 | err = -ENODEV; | |
986 | goto free_resources; | |
987 | } | |
988 | ||
989 | free_resources: | |
990 | mv_xor_free_chan_resources(dma_chan); | |
991 | out: | |
992 | kfree(src); | |
993 | kfree(dest); | |
994 | return err; | |
995 | } | |
996 | ||
997 | #define MV_XOR_NUM_SRC_TEST 4 /* must be <= 15 */ | |
998 | static int __devinit | |
999 | mv_xor_xor_self_test(struct mv_xor_device *device) | |
1000 | { | |
1001 | int i, src_idx; | |
1002 | struct page *dest; | |
1003 | struct page *xor_srcs[MV_XOR_NUM_SRC_TEST]; | |
1004 | dma_addr_t dma_srcs[MV_XOR_NUM_SRC_TEST]; | |
1005 | dma_addr_t dest_dma; | |
1006 | struct dma_async_tx_descriptor *tx; | |
1007 | struct dma_chan *dma_chan; | |
1008 | dma_cookie_t cookie; | |
1009 | u8 cmp_byte = 0; | |
1010 | u32 cmp_word; | |
1011 | int err = 0; | |
1012 | struct mv_xor_chan *mv_chan; | |
1013 | ||
1014 | for (src_idx = 0; src_idx < MV_XOR_NUM_SRC_TEST; src_idx++) { | |
1015 | xor_srcs[src_idx] = alloc_page(GFP_KERNEL); | |
a09b09ae RK |
1016 | if (!xor_srcs[src_idx]) { |
1017 | while (src_idx--) | |
ff7b0479 | 1018 | __free_page(xor_srcs[src_idx]); |
a09b09ae RK |
1019 | return -ENOMEM; |
1020 | } | |
ff7b0479 SB |
1021 | } |
1022 | ||
1023 | dest = alloc_page(GFP_KERNEL); | |
a09b09ae RK |
1024 | if (!dest) { |
1025 | while (src_idx--) | |
ff7b0479 | 1026 | __free_page(xor_srcs[src_idx]); |
a09b09ae RK |
1027 | return -ENOMEM; |
1028 | } | |
ff7b0479 SB |
1029 | |
1030 | /* Fill in src buffers */ | |
1031 | for (src_idx = 0; src_idx < MV_XOR_NUM_SRC_TEST; src_idx++) { | |
1032 | u8 *ptr = page_address(xor_srcs[src_idx]); | |
1033 | for (i = 0; i < PAGE_SIZE; i++) | |
1034 | ptr[i] = (1 << src_idx); | |
1035 | } | |
1036 | ||
1037 | for (src_idx = 0; src_idx < MV_XOR_NUM_SRC_TEST; src_idx++) | |
1038 | cmp_byte ^= (u8) (1 << src_idx); | |
1039 | ||
1040 | cmp_word = (cmp_byte << 24) | (cmp_byte << 16) | | |
1041 | (cmp_byte << 8) | cmp_byte; | |
1042 | ||
1043 | memset(page_address(dest), 0, PAGE_SIZE); | |
1044 | ||
1045 | dma_chan = container_of(device->common.channels.next, | |
1046 | struct dma_chan, | |
1047 | device_node); | |
aa1e6f1a | 1048 | if (mv_xor_alloc_chan_resources(dma_chan) < 1) { |
ff7b0479 SB |
1049 | err = -ENODEV; |
1050 | goto out; | |
1051 | } | |
1052 | ||
1053 | /* test xor */ | |
1054 | dest_dma = dma_map_page(dma_chan->device->dev, dest, 0, PAGE_SIZE, | |
1055 | DMA_FROM_DEVICE); | |
1056 | ||
1057 | for (i = 0; i < MV_XOR_NUM_SRC_TEST; i++) | |
1058 | dma_srcs[i] = dma_map_page(dma_chan->device->dev, xor_srcs[i], | |
1059 | 0, PAGE_SIZE, DMA_TO_DEVICE); | |
1060 | ||
1061 | tx = mv_xor_prep_dma_xor(dma_chan, dest_dma, dma_srcs, | |
1062 | MV_XOR_NUM_SRC_TEST, PAGE_SIZE, 0); | |
1063 | ||
1064 | cookie = mv_xor_tx_submit(tx); | |
1065 | mv_xor_issue_pending(dma_chan); | |
1066 | async_tx_ack(tx); | |
1067 | msleep(8); | |
1068 | ||
07934481 | 1069 | if (mv_xor_status(dma_chan, cookie, NULL) != |
ff7b0479 SB |
1070 | DMA_SUCCESS) { |
1071 | dev_printk(KERN_ERR, dma_chan->device->dev, | |
1072 | "Self-test xor timed out, disabling\n"); | |
1073 | err = -ENODEV; | |
1074 | goto free_resources; | |
1075 | } | |
1076 | ||
1077 | mv_chan = to_mv_xor_chan(dma_chan); | |
1078 | dma_sync_single_for_cpu(&mv_chan->device->pdev->dev, dest_dma, | |
1079 | PAGE_SIZE, DMA_FROM_DEVICE); | |
1080 | for (i = 0; i < (PAGE_SIZE / sizeof(u32)); i++) { | |
1081 | u32 *ptr = page_address(dest); | |
1082 | if (ptr[i] != cmp_word) { | |
1083 | dev_printk(KERN_ERR, dma_chan->device->dev, | |
1084 | "Self-test xor failed compare, disabling." | |
1085 | " index %d, data %x, expected %x\n", i, | |
1086 | ptr[i], cmp_word); | |
1087 | err = -ENODEV; | |
1088 | goto free_resources; | |
1089 | } | |
1090 | } | |
1091 | ||
1092 | free_resources: | |
1093 | mv_xor_free_chan_resources(dma_chan); | |
1094 | out: | |
1095 | src_idx = MV_XOR_NUM_SRC_TEST; | |
1096 | while (src_idx--) | |
1097 | __free_page(xor_srcs[src_idx]); | |
1098 | __free_page(dest); | |
1099 | return err; | |
1100 | } | |
1101 | ||
1102 | static int __devexit mv_xor_remove(struct platform_device *dev) | |
1103 | { | |
1104 | struct mv_xor_device *device = platform_get_drvdata(dev); | |
1105 | struct dma_chan *chan, *_chan; | |
1106 | struct mv_xor_chan *mv_chan; | |
1107 | struct mv_xor_platform_data *plat_data = dev->dev.platform_data; | |
1108 | ||
1109 | dma_async_device_unregister(&device->common); | |
1110 | ||
1111 | dma_free_coherent(&dev->dev, plat_data->pool_size, | |
1112 | device->dma_desc_pool_virt, device->dma_desc_pool); | |
1113 | ||
1114 | list_for_each_entry_safe(chan, _chan, &device->common.channels, | |
1115 | device_node) { | |
1116 | mv_chan = to_mv_xor_chan(chan); | |
1117 | list_del(&chan->device_node); | |
1118 | } | |
1119 | ||
1120 | return 0; | |
1121 | } | |
1122 | ||
1123 | static int __devinit mv_xor_probe(struct platform_device *pdev) | |
1124 | { | |
1125 | int ret = 0; | |
1126 | int irq; | |
1127 | struct mv_xor_device *adev; | |
1128 | struct mv_xor_chan *mv_chan; | |
1129 | struct dma_device *dma_dev; | |
1130 | struct mv_xor_platform_data *plat_data = pdev->dev.platform_data; | |
1131 | ||
1132 | ||
1133 | adev = devm_kzalloc(&pdev->dev, sizeof(*adev), GFP_KERNEL); | |
1134 | if (!adev) | |
1135 | return -ENOMEM; | |
1136 | ||
1137 | dma_dev = &adev->common; | |
1138 | ||
1139 | /* allocate coherent memory for hardware descriptors | |
1140 | * note: writecombine gives slightly better performance, but | |
1141 | * requires that we explicitly flush the writes | |
1142 | */ | |
1143 | adev->dma_desc_pool_virt = dma_alloc_writecombine(&pdev->dev, | |
1144 | plat_data->pool_size, | |
1145 | &adev->dma_desc_pool, | |
1146 | GFP_KERNEL); | |
1147 | if (!adev->dma_desc_pool_virt) | |
1148 | return -ENOMEM; | |
1149 | ||
1150 | adev->id = plat_data->hw_id; | |
1151 | ||
1152 | /* discover transaction capabilites from the platform data */ | |
1153 | dma_dev->cap_mask = plat_data->cap_mask; | |
1154 | adev->pdev = pdev; | |
1155 | platform_set_drvdata(pdev, adev); | |
1156 | ||
1157 | adev->shared = platform_get_drvdata(plat_data->shared); | |
1158 | ||
1159 | INIT_LIST_HEAD(&dma_dev->channels); | |
1160 | ||
1161 | /* set base routines */ | |
1162 | dma_dev->device_alloc_chan_resources = mv_xor_alloc_chan_resources; | |
1163 | dma_dev->device_free_chan_resources = mv_xor_free_chan_resources; | |
07934481 | 1164 | dma_dev->device_tx_status = mv_xor_status; |
ff7b0479 SB |
1165 | dma_dev->device_issue_pending = mv_xor_issue_pending; |
1166 | dma_dev->dev = &pdev->dev; | |
1167 | ||
1168 | /* set prep routines based on capability */ | |
1169 | if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask)) | |
1170 | dma_dev->device_prep_dma_memcpy = mv_xor_prep_dma_memcpy; | |
1171 | if (dma_has_cap(DMA_MEMSET, dma_dev->cap_mask)) | |
1172 | dma_dev->device_prep_dma_memset = mv_xor_prep_dma_memset; | |
1173 | if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) { | |
c019894e | 1174 | dma_dev->max_xor = 8; |
ff7b0479 SB |
1175 | dma_dev->device_prep_dma_xor = mv_xor_prep_dma_xor; |
1176 | } | |
1177 | ||
1178 | mv_chan = devm_kzalloc(&pdev->dev, sizeof(*mv_chan), GFP_KERNEL); | |
1179 | if (!mv_chan) { | |
1180 | ret = -ENOMEM; | |
1181 | goto err_free_dma; | |
1182 | } | |
1183 | mv_chan->device = adev; | |
1184 | mv_chan->idx = plat_data->hw_id; | |
1185 | mv_chan->mmr_base = adev->shared->xor_base; | |
1186 | ||
1187 | if (!mv_chan->mmr_base) { | |
1188 | ret = -ENOMEM; | |
1189 | goto err_free_dma; | |
1190 | } | |
1191 | tasklet_init(&mv_chan->irq_tasklet, mv_xor_tasklet, (unsigned long) | |
1192 | mv_chan); | |
1193 | ||
1194 | /* clear errors before enabling interrupts */ | |
1195 | mv_xor_device_clear_err_status(mv_chan); | |
1196 | ||
1197 | irq = platform_get_irq(pdev, 0); | |
1198 | if (irq < 0) { | |
1199 | ret = irq; | |
1200 | goto err_free_dma; | |
1201 | } | |
1202 | ret = devm_request_irq(&pdev->dev, irq, | |
1203 | mv_xor_interrupt_handler, | |
1204 | 0, dev_name(&pdev->dev), mv_chan); | |
1205 | if (ret) | |
1206 | goto err_free_dma; | |
1207 | ||
1208 | mv_chan_unmask_interrupts(mv_chan); | |
1209 | ||
1210 | mv_set_mode(mv_chan, DMA_MEMCPY); | |
1211 | ||
1212 | spin_lock_init(&mv_chan->lock); | |
1213 | INIT_LIST_HEAD(&mv_chan->chain); | |
1214 | INIT_LIST_HEAD(&mv_chan->completed_slots); | |
1215 | INIT_LIST_HEAD(&mv_chan->all_slots); | |
ff7b0479 SB |
1216 | mv_chan->common.device = dma_dev; |
1217 | ||
1218 | list_add_tail(&mv_chan->common.device_node, &dma_dev->channels); | |
1219 | ||
1220 | if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask)) { | |
1221 | ret = mv_xor_memcpy_self_test(adev); | |
1222 | dev_dbg(&pdev->dev, "memcpy self test returned %d\n", ret); | |
1223 | if (ret) | |
1224 | goto err_free_dma; | |
1225 | } | |
1226 | ||
1227 | if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) { | |
1228 | ret = mv_xor_xor_self_test(adev); | |
1229 | dev_dbg(&pdev->dev, "xor self test returned %d\n", ret); | |
1230 | if (ret) | |
1231 | goto err_free_dma; | |
1232 | } | |
1233 | ||
1234 | dev_printk(KERN_INFO, &pdev->dev, "Marvell XOR: " | |
1235 | "( %s%s%s%s)\n", | |
1236 | dma_has_cap(DMA_XOR, dma_dev->cap_mask) ? "xor " : "", | |
1237 | dma_has_cap(DMA_MEMSET, dma_dev->cap_mask) ? "fill " : "", | |
1238 | dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask) ? "cpy " : "", | |
1239 | dma_has_cap(DMA_INTERRUPT, dma_dev->cap_mask) ? "intr " : ""); | |
1240 | ||
1241 | dma_async_device_register(dma_dev); | |
1242 | goto out; | |
1243 | ||
1244 | err_free_dma: | |
1245 | dma_free_coherent(&adev->pdev->dev, plat_data->pool_size, | |
1246 | adev->dma_desc_pool_virt, adev->dma_desc_pool); | |
1247 | out: | |
1248 | return ret; | |
1249 | } | |
1250 | ||
1251 | static void | |
1252 | mv_xor_conf_mbus_windows(struct mv_xor_shared_private *msp, | |
1253 | struct mbus_dram_target_info *dram) | |
1254 | { | |
1255 | void __iomem *base = msp->xor_base; | |
1256 | u32 win_enable = 0; | |
1257 | int i; | |
1258 | ||
1259 | for (i = 0; i < 8; i++) { | |
1260 | writel(0, base + WINDOW_BASE(i)); | |
1261 | writel(0, base + WINDOW_SIZE(i)); | |
1262 | if (i < 4) | |
1263 | writel(0, base + WINDOW_REMAP_HIGH(i)); | |
1264 | } | |
1265 | ||
1266 | for (i = 0; i < dram->num_cs; i++) { | |
1267 | struct mbus_dram_window *cs = dram->cs + i; | |
1268 | ||
1269 | writel((cs->base & 0xffff0000) | | |
1270 | (cs->mbus_attr << 8) | | |
1271 | dram->mbus_dram_target_id, base + WINDOW_BASE(i)); | |
1272 | writel((cs->size - 1) & 0xffff0000, base + WINDOW_SIZE(i)); | |
1273 | ||
1274 | win_enable |= (1 << i); | |
1275 | win_enable |= 3 << (16 + (2 * i)); | |
1276 | } | |
1277 | ||
1278 | writel(win_enable, base + WINDOW_BAR_ENABLE(0)); | |
1279 | writel(win_enable, base + WINDOW_BAR_ENABLE(1)); | |
1280 | } | |
1281 | ||
1282 | static struct platform_driver mv_xor_driver = { | |
1283 | .probe = mv_xor_probe, | |
bdf602bd | 1284 | .remove = __devexit_p(mv_xor_remove), |
ff7b0479 SB |
1285 | .driver = { |
1286 | .owner = THIS_MODULE, | |
1287 | .name = MV_XOR_NAME, | |
1288 | }, | |
1289 | }; | |
1290 | ||
1291 | static int mv_xor_shared_probe(struct platform_device *pdev) | |
1292 | { | |
1293 | struct mv_xor_platform_shared_data *msd = pdev->dev.platform_data; | |
1294 | struct mv_xor_shared_private *msp; | |
1295 | struct resource *res; | |
1296 | ||
1297 | dev_printk(KERN_NOTICE, &pdev->dev, "Marvell shared XOR driver\n"); | |
1298 | ||
1299 | msp = devm_kzalloc(&pdev->dev, sizeof(*msp), GFP_KERNEL); | |
1300 | if (!msp) | |
1301 | return -ENOMEM; | |
1302 | ||
1303 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
1304 | if (!res) | |
1305 | return -ENODEV; | |
1306 | ||
1307 | msp->xor_base = devm_ioremap(&pdev->dev, res->start, | |
4de1ba15 | 1308 | resource_size(res)); |
ff7b0479 SB |
1309 | if (!msp->xor_base) |
1310 | return -EBUSY; | |
1311 | ||
1312 | res = platform_get_resource(pdev, IORESOURCE_MEM, 1); | |
1313 | if (!res) | |
1314 | return -ENODEV; | |
1315 | ||
1316 | msp->xor_high_base = devm_ioremap(&pdev->dev, res->start, | |
4de1ba15 | 1317 | resource_size(res)); |
ff7b0479 SB |
1318 | if (!msp->xor_high_base) |
1319 | return -EBUSY; | |
1320 | ||
1321 | platform_set_drvdata(pdev, msp); | |
1322 | ||
1323 | /* | |
1324 | * (Re-)program MBUS remapping windows if we are asked to. | |
1325 | */ | |
1326 | if (msd != NULL && msd->dram != NULL) | |
1327 | mv_xor_conf_mbus_windows(msp, msd->dram); | |
1328 | ||
1329 | return 0; | |
1330 | } | |
1331 | ||
1332 | static int mv_xor_shared_remove(struct platform_device *pdev) | |
1333 | { | |
1334 | return 0; | |
1335 | } | |
1336 | ||
1337 | static struct platform_driver mv_xor_shared_driver = { | |
1338 | .probe = mv_xor_shared_probe, | |
1339 | .remove = mv_xor_shared_remove, | |
1340 | .driver = { | |
1341 | .owner = THIS_MODULE, | |
1342 | .name = MV_XOR_SHARED_NAME, | |
1343 | }, | |
1344 | }; | |
1345 | ||
1346 | ||
1347 | static int __init mv_xor_init(void) | |
1348 | { | |
1349 | int rc; | |
1350 | ||
1351 | rc = platform_driver_register(&mv_xor_shared_driver); | |
1352 | if (!rc) { | |
1353 | rc = platform_driver_register(&mv_xor_driver); | |
1354 | if (rc) | |
1355 | platform_driver_unregister(&mv_xor_shared_driver); | |
1356 | } | |
1357 | return rc; | |
1358 | } | |
1359 | module_init(mv_xor_init); | |
1360 | ||
1361 | /* it's currently unsafe to unload this module */ | |
1362 | #if 0 | |
1363 | static void __exit mv_xor_exit(void) | |
1364 | { | |
1365 | platform_driver_unregister(&mv_xor_driver); | |
1366 | platform_driver_unregister(&mv_xor_shared_driver); | |
1367 | return; | |
1368 | } | |
1369 | ||
1370 | module_exit(mv_xor_exit); | |
1371 | #endif | |
1372 | ||
1373 | MODULE_AUTHOR("Saeed Bishara <saeed@marvell.com>"); | |
1374 | MODULE_DESCRIPTION("DMA engine driver for Marvell's XOR engine"); | |
1375 | MODULE_LICENSE("GPL"); |