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x86, mrst: use a temporary variable for SFI irq
[linux-btrfs-devel.git] / drivers / dma / mv_xor.c
blob9a353c2216d09a1c1a498da4344f31a03f90aad3
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>
21 #include <linux/slab.h>
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>
28 #include <plat/mv_xor.h>
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 {
165 u32 val = ~(1 << (chan->idx * 16));
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;
311 enum dma_ctrl_flags flags = desc->async_tx.flags;
312 u32 src_cnt;
313 dma_addr_t addr;
314 dma_addr_t dest;
315
316 src_cnt = unmap->unmap_src_cnt;
317 dest = mv_desc_get_dest_addr(unmap);
318 if (!(flags & DMA_COMPL_SKIP_DEST_UNMAP)) {
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);
326 }
327
328 if (!(flags & DMA_COMPL_SKIP_SRC_UNMAP)) {
329 while (src_cnt--) {
330 addr = mv_desc_get_src_addr(unmap,
331 src_cnt);
332 if (addr == dest)
333 continue;
334 dma_unmap_page(dev, addr, len,
335 DMA_TO_DEVICE);
336 }
337 }
338 desc->group_head = NULL;
339 }
340 }
341
342 /* run dependent operations */
343 dma_run_dependencies(&desc->async_tx);
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;
452 mv_xor_slot_cleanup(chan);
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;
521 list_splice(&chain, &alloc_tail->tx_list);
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))
569 list_splice_init(&sw_desc->tx_list, &mv_chan->chain);
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);
576 list_splice_init(&grp_start->tx_list,
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 */
610 static int mv_xor_alloc_chan_resources(struct dma_chan *chan)
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);
636 INIT_LIST_HEAD(&slot->tx_list);
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
674 BUG_ON(len > MV_XOR_MAX_BYTE_COUNT);
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
713 BUG_ON(len > MV_XOR_MAX_BYTE_COUNT);
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
747 BUG_ON(len > MV_XOR_MAX_BYTE_COUNT);
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 /**
813 * mv_xor_status - poll the status of an XOR transaction
814 * @chan: XOR channel handle
815 * @cookie: XOR transaction identifier
816 * @txstate: XOR transactions state holder (or NULL)
817 */
818 static enum dma_status mv_xor_status(struct dma_chan *chan,
819 dma_cookie_t cookie,
820 struct dma_tx_state *txstate)
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;
830 dma_set_tx_state(txstate, last_complete, last_used, 0);
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
842 dma_set_tx_state(txstate, last_complete, last_used, 0);
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);
953 if (mv_xor_alloc_chan_resources(dma_chan) < 1) {
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
971 if (mv_xor_status(dma_chan, cookie, NULL) !=
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);
1016 if (!xor_srcs[src_idx]) {
1017 while (src_idx--)
1018 __free_page(xor_srcs[src_idx]);
1019 return -ENOMEM;
1020 }
1021 }
1022
1023 dest = alloc_page(GFP_KERNEL);
1024 if (!dest) {
1025 while (src_idx--)
1026 __free_page(xor_srcs[src_idx]);
1027 return -ENOMEM;
1028 }
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);
1048 if (mv_xor_alloc_chan_resources(dma_chan) < 1) {
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
1069 if (mv_xor_status(dma_chan, cookie, NULL) !=
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;
1164 dma_dev->device_tx_status = mv_xor_status;
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)) {
1174 dma_dev->max_xor = 8;
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);
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,
1284 .remove = __devexit_p(mv_xor_remove),
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,
1308 resource_size(res));
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,
1317 resource_size(res));
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");
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