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Merge remote-tracking branch 'cleancache/linux-next'
[linux-2.6/next.git] / drivers / dma / pch_dma.c
blob8d8fef1480a93115ab17c51f6c97d0130b44b21d
1 /*
2 * Topcliff PCH DMA controller driver
3 * Copyright (c) 2010 Intel Corporation
4 * Copyright (C) 2011 OKI SEMICONDUCTOR CO., LTD.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
18 */
19
20 #include <linux/dmaengine.h>
21 #include <linux/dma-mapping.h>
22 #include <linux/init.h>
23 #include <linux/pci.h>
24 #include <linux/interrupt.h>
25 #include <linux/module.h>
26 #include <linux/pch_dma.h>
27
28 #define DRV_NAME "pch-dma"
29
30 #define DMA_CTL0_DISABLE 0x0
31 #define DMA_CTL0_SG 0x1
32 #define DMA_CTL0_ONESHOT 0x2
33 #define DMA_CTL0_MODE_MASK_BITS 0x3
34 #define DMA_CTL0_DIR_SHIFT_BITS 2
35 #define DMA_CTL0_BITS_PER_CH 4
36
37 #define DMA_CTL2_START_SHIFT_BITS 8
38 #define DMA_CTL2_IRQ_ENABLE_MASK ((1UL << DMA_CTL2_START_SHIFT_BITS) - 1)
39
40 #define DMA_STATUS_IDLE 0x0
41 #define DMA_STATUS_DESC_READ 0x1
42 #define DMA_STATUS_WAIT 0x2
43 #define DMA_STATUS_ACCESS 0x3
44 #define DMA_STATUS_BITS_PER_CH 2
45 #define DMA_STATUS_MASK_BITS 0x3
46 #define DMA_STATUS_SHIFT_BITS 16
47 #define DMA_STATUS_IRQ(x) (0x1 << (x))
48 #define DMA_STATUS_ERR(x) (0x1 << ((x) + 8))
49
50 #define DMA_DESC_WIDTH_SHIFT_BITS 12
51 #define DMA_DESC_WIDTH_1_BYTE (0x3 << DMA_DESC_WIDTH_SHIFT_BITS)
52 #define DMA_DESC_WIDTH_2_BYTES (0x2 << DMA_DESC_WIDTH_SHIFT_BITS)
53 #define DMA_DESC_WIDTH_4_BYTES (0x0 << DMA_DESC_WIDTH_SHIFT_BITS)
54 #define DMA_DESC_MAX_COUNT_1_BYTE 0x3FF
55 #define DMA_DESC_MAX_COUNT_2_BYTES 0x3FF
56 #define DMA_DESC_MAX_COUNT_4_BYTES 0x7FF
57 #define DMA_DESC_END_WITHOUT_IRQ 0x0
58 #define DMA_DESC_END_WITH_IRQ 0x1
59 #define DMA_DESC_FOLLOW_WITHOUT_IRQ 0x2
60 #define DMA_DESC_FOLLOW_WITH_IRQ 0x3
61
62 #define MAX_CHAN_NR 8
63
64 static unsigned int init_nr_desc_per_channel = 64;
65 module_param(init_nr_desc_per_channel, uint, 0644);
66 MODULE_PARM_DESC(init_nr_desc_per_channel,
67 "initial descriptors per channel (default: 64)");
68
69 struct pch_dma_desc_regs {
70 u32 dev_addr;
71 u32 mem_addr;
72 u32 size;
73 u32 next;
74 };
75
76 struct pch_dma_regs {
77 u32 dma_ctl0;
78 u32 dma_ctl1;
79 u32 dma_ctl2;
80 u32 reserved1;
81 u32 dma_sts0;
82 u32 dma_sts1;
83 u32 reserved2;
84 u32 reserved3;
85 struct pch_dma_desc_regs desc[MAX_CHAN_NR];
86 };
87
88 struct pch_dma_desc {
89 struct pch_dma_desc_regs regs;
90 struct dma_async_tx_descriptor txd;
91 struct list_head desc_node;
92 struct list_head tx_list;
93 };
94
95 struct pch_dma_chan {
96 struct dma_chan chan;
97 void __iomem *membase;
98 enum dma_data_direction dir;
99 struct tasklet_struct tasklet;
100 unsigned long err_status;
101
102 spinlock_t lock;
103
104 dma_cookie_t completed_cookie;
105 struct list_head active_list;
106 struct list_head queue;
107 struct list_head free_list;
108 unsigned int descs_allocated;
109 };
110
111 #define PDC_DEV_ADDR 0x00
112 #define PDC_MEM_ADDR 0x04
113 #define PDC_SIZE 0x08
114 #define PDC_NEXT 0x0C
115
116 #define channel_readl(pdc, name) \
117 readl((pdc)->membase + PDC_##name)
118 #define channel_writel(pdc, name, val) \
119 writel((val), (pdc)->membase + PDC_##name)
120
121 struct pch_dma {
122 struct dma_device dma;
123 void __iomem *membase;
124 struct pci_pool *pool;
125 struct pch_dma_regs regs;
126 struct pch_dma_desc_regs ch_regs[MAX_CHAN_NR];
127 struct pch_dma_chan channels[MAX_CHAN_NR];
128 };
129
130 #define PCH_DMA_CTL0 0x00
131 #define PCH_DMA_CTL1 0x04
132 #define PCH_DMA_CTL2 0x08
133 #define PCH_DMA_STS0 0x10
134 #define PCH_DMA_STS1 0x14
135
136 #define dma_readl(pd, name) \
137 readl((pd)->membase + PCH_DMA_##name)
138 #define dma_writel(pd, name, val) \
139 writel((val), (pd)->membase + PCH_DMA_##name)
140
141 static inline struct pch_dma_desc *to_pd_desc(struct dma_async_tx_descriptor *txd)
142 {
143 return container_of(txd, struct pch_dma_desc, txd);
144 }
145
146 static inline struct pch_dma_chan *to_pd_chan(struct dma_chan *chan)
147 {
148 return container_of(chan, struct pch_dma_chan, chan);
149 }
150
151 static inline struct pch_dma *to_pd(struct dma_device *ddev)
152 {
153 return container_of(ddev, struct pch_dma, dma);
154 }
155
156 static inline struct device *chan2dev(struct dma_chan *chan)
157 {
158 return &chan->dev->device;
159 }
160
161 static inline struct device *chan2parent(struct dma_chan *chan)
162 {
163 return chan->dev->device.parent;
164 }
165
166 static inline struct pch_dma_desc *pdc_first_active(struct pch_dma_chan *pd_chan)
167 {
168 return list_first_entry(&pd_chan->active_list,
169 struct pch_dma_desc, desc_node);
170 }
171
172 static inline struct pch_dma_desc *pdc_first_queued(struct pch_dma_chan *pd_chan)
173 {
174 return list_first_entry(&pd_chan->queue,
175 struct pch_dma_desc, desc_node);
176 }
177
178 static void pdc_enable_irq(struct dma_chan *chan, int enable)
179 {
180 struct pch_dma *pd = to_pd(chan->device);
181 u32 val;
182
183 val = dma_readl(pd, CTL2);
184
185 if (enable)
186 val |= 0x1 << chan->chan_id;
187 else
188 val &= ~(0x1 << chan->chan_id);
189
190 dma_writel(pd, CTL2, val);
191
192 dev_dbg(chan2dev(chan), "pdc_enable_irq: chan %d -> %x\n",
193 chan->chan_id, val);
194 }
195
196 static void pdc_set_dir(struct dma_chan *chan)
197 {
198 struct pch_dma_chan *pd_chan = to_pd_chan(chan);
199 struct pch_dma *pd = to_pd(chan->device);
200 u32 val;
201
202 val = dma_readl(pd, CTL0);
203
204 if (pd_chan->dir == DMA_TO_DEVICE)
205 val |= 0x1 << (DMA_CTL0_BITS_PER_CH * chan->chan_id +
206 DMA_CTL0_DIR_SHIFT_BITS);
207 else
208 val &= ~(0x1 << (DMA_CTL0_BITS_PER_CH * chan->chan_id +
209 DMA_CTL0_DIR_SHIFT_BITS));
210
211 dma_writel(pd, CTL0, val);
212
213 dev_dbg(chan2dev(chan), "pdc_set_dir: chan %d -> %x\n",
214 chan->chan_id, val);
215 }
216
217 static void pdc_set_mode(struct dma_chan *chan, u32 mode)
218 {
219 struct pch_dma *pd = to_pd(chan->device);
220 u32 val;
221
222 val = dma_readl(pd, CTL0);
223
224 val &= ~(DMA_CTL0_MODE_MASK_BITS <<
225 (DMA_CTL0_BITS_PER_CH * chan->chan_id));
226 val |= mode << (DMA_CTL0_BITS_PER_CH * chan->chan_id);
227
228 dma_writel(pd, CTL0, val);
229
230 dev_dbg(chan2dev(chan), "pdc_set_mode: chan %d -> %x\n",
231 chan->chan_id, val);
232 }
233
234 static u32 pdc_get_status(struct pch_dma_chan *pd_chan)
235 {
236 struct pch_dma *pd = to_pd(pd_chan->chan.device);
237 u32 val;
238
239 val = dma_readl(pd, STS0);
240 return DMA_STATUS_MASK_BITS & (val >> (DMA_STATUS_SHIFT_BITS +
241 DMA_STATUS_BITS_PER_CH * pd_chan->chan.chan_id));
242 }
243
244 static bool pdc_is_idle(struct pch_dma_chan *pd_chan)
245 {
246 if (pdc_get_status(pd_chan) == DMA_STATUS_IDLE)
247 return true;
248 else
249 return false;
250 }
251
252 static void pdc_dostart(struct pch_dma_chan *pd_chan, struct pch_dma_desc* desc)
253 {
254 struct pch_dma *pd = to_pd(pd_chan->chan.device);
255 u32 val;
256
257 if (!pdc_is_idle(pd_chan)) {
258 dev_err(chan2dev(&pd_chan->chan),
259 "BUG: Attempt to start non-idle channel\n");
260 return;
261 }
262
263 dev_dbg(chan2dev(&pd_chan->chan), "chan %d -> dev_addr: %x\n",
264 pd_chan->chan.chan_id, desc->regs.dev_addr);
265 dev_dbg(chan2dev(&pd_chan->chan), "chan %d -> mem_addr: %x\n",
266 pd_chan->chan.chan_id, desc->regs.mem_addr);
267 dev_dbg(chan2dev(&pd_chan->chan), "chan %d -> size: %x\n",
268 pd_chan->chan.chan_id, desc->regs.size);
269 dev_dbg(chan2dev(&pd_chan->chan), "chan %d -> next: %x\n",
270 pd_chan->chan.chan_id, desc->regs.next);
271
272 if (list_empty(&desc->tx_list)) {
273 channel_writel(pd_chan, DEV_ADDR, desc->regs.dev_addr);
274 channel_writel(pd_chan, MEM_ADDR, desc->regs.mem_addr);
275 channel_writel(pd_chan, SIZE, desc->regs.size);
276 channel_writel(pd_chan, NEXT, desc->regs.next);
277 pdc_set_mode(&pd_chan->chan, DMA_CTL0_ONESHOT);
278 } else {
279 channel_writel(pd_chan, NEXT, desc->txd.phys);
280 pdc_set_mode(&pd_chan->chan, DMA_CTL0_SG);
281 }
282
283 val = dma_readl(pd, CTL2);
284 val |= 1 << (DMA_CTL2_START_SHIFT_BITS + pd_chan->chan.chan_id);
285 dma_writel(pd, CTL2, val);
286 }
287
288 static void pdc_chain_complete(struct pch_dma_chan *pd_chan,
289 struct pch_dma_desc *desc)
290 {
291 struct dma_async_tx_descriptor *txd = &desc->txd;
292 dma_async_tx_callback callback = txd->callback;
293 void *param = txd->callback_param;
294
295 list_splice_init(&desc->tx_list, &pd_chan->free_list);
296 list_move(&desc->desc_node, &pd_chan->free_list);
297
298 if (callback)
299 callback(param);
300 }
301
302 static void pdc_complete_all(struct pch_dma_chan *pd_chan)
303 {
304 struct pch_dma_desc *desc, *_d;
305 LIST_HEAD(list);
306
307 BUG_ON(!pdc_is_idle(pd_chan));
308
309 if (!list_empty(&pd_chan->queue))
310 pdc_dostart(pd_chan, pdc_first_queued(pd_chan));
311
312 list_splice_init(&pd_chan->active_list, &list);
313 list_splice_init(&pd_chan->queue, &pd_chan->active_list);
314
315 list_for_each_entry_safe(desc, _d, &list, desc_node)
316 pdc_chain_complete(pd_chan, desc);
317 }
318
319 static void pdc_handle_error(struct pch_dma_chan *pd_chan)
320 {
321 struct pch_dma_desc *bad_desc;
322
323 bad_desc = pdc_first_active(pd_chan);
324 list_del(&bad_desc->desc_node);
325
326 list_splice_init(&pd_chan->queue, pd_chan->active_list.prev);
327
328 if (!list_empty(&pd_chan->active_list))
329 pdc_dostart(pd_chan, pdc_first_active(pd_chan));
330
331 dev_crit(chan2dev(&pd_chan->chan), "Bad descriptor submitted\n");
332 dev_crit(chan2dev(&pd_chan->chan), "descriptor cookie: %d\n",
333 bad_desc->txd.cookie);
334
335 pdc_chain_complete(pd_chan, bad_desc);
336 }
337
338 static void pdc_advance_work(struct pch_dma_chan *pd_chan)
339 {
340 if (list_empty(&pd_chan->active_list) ||
341 list_is_singular(&pd_chan->active_list)) {
342 pdc_complete_all(pd_chan);
343 } else {
344 pdc_chain_complete(pd_chan, pdc_first_active(pd_chan));
345 pdc_dostart(pd_chan, pdc_first_active(pd_chan));
346 }
347 }
348
349 static dma_cookie_t pdc_assign_cookie(struct pch_dma_chan *pd_chan,
350 struct pch_dma_desc *desc)
351 {
352 dma_cookie_t cookie = pd_chan->chan.cookie;
353
354 if (++cookie < 0)
355 cookie = 1;
356
357 pd_chan->chan.cookie = cookie;
358 desc->txd.cookie = cookie;
359
360 return cookie;
361 }
362
363 static dma_cookie_t pd_tx_submit(struct dma_async_tx_descriptor *txd)
364 {
365 struct pch_dma_desc *desc = to_pd_desc(txd);
366 struct pch_dma_chan *pd_chan = to_pd_chan(txd->chan);
367 dma_cookie_t cookie;
368
369 spin_lock(&pd_chan->lock);
370 cookie = pdc_assign_cookie(pd_chan, desc);
371
372 if (list_empty(&pd_chan->active_list)) {
373 list_add_tail(&desc->desc_node, &pd_chan->active_list);
374 pdc_dostart(pd_chan, desc);
375 } else {
376 list_add_tail(&desc->desc_node, &pd_chan->queue);
377 }
378
379 spin_unlock(&pd_chan->lock);
380 return 0;
381 }
382
383 static struct pch_dma_desc *pdc_alloc_desc(struct dma_chan *chan, gfp_t flags)
384 {
385 struct pch_dma_desc *desc = NULL;
386 struct pch_dma *pd = to_pd(chan->device);
387 dma_addr_t addr;
388
389 desc = pci_pool_alloc(pd->pool, flags, &addr);
390 if (desc) {
391 memset(desc, 0, sizeof(struct pch_dma_desc));
392 INIT_LIST_HEAD(&desc->tx_list);
393 dma_async_tx_descriptor_init(&desc->txd, chan);
394 desc->txd.tx_submit = pd_tx_submit;
395 desc->txd.flags = DMA_CTRL_ACK;
396 desc->txd.phys = addr;
397 }
398
399 return desc;
400 }
401
402 static struct pch_dma_desc *pdc_desc_get(struct pch_dma_chan *pd_chan)
403 {
404 struct pch_dma_desc *desc, *_d;
405 struct pch_dma_desc *ret = NULL;
406 int i;
407
408 spin_lock(&pd_chan->lock);
409 list_for_each_entry_safe(desc, _d, &pd_chan->free_list, desc_node) {
410 i++;
411 if (async_tx_test_ack(&desc->txd)) {
412 list_del(&desc->desc_node);
413 ret = desc;
414 break;
415 }
416 dev_dbg(chan2dev(&pd_chan->chan), "desc %p not ACKed\n", desc);
417 }
418 spin_unlock(&pd_chan->lock);
419 dev_dbg(chan2dev(&pd_chan->chan), "scanned %d descriptors\n", i);
420
421 if (!ret) {
422 ret = pdc_alloc_desc(&pd_chan->chan, GFP_NOIO);
423 if (ret) {
424 spin_lock(&pd_chan->lock);
425 pd_chan->descs_allocated++;
426 spin_unlock(&pd_chan->lock);
427 } else {
428 dev_err(chan2dev(&pd_chan->chan),
429 "failed to alloc desc\n");
430 }
431 }
432
433 return ret;
434 }
435
436 static void pdc_desc_put(struct pch_dma_chan *pd_chan,
437 struct pch_dma_desc *desc)
438 {
439 if (desc) {
440 spin_lock(&pd_chan->lock);
441 list_splice_init(&desc->tx_list, &pd_chan->free_list);
442 list_add(&desc->desc_node, &pd_chan->free_list);
443 spin_unlock(&pd_chan->lock);
444 }
445 }
446
447 static int pd_alloc_chan_resources(struct dma_chan *chan)
448 {
449 struct pch_dma_chan *pd_chan = to_pd_chan(chan);
450 struct pch_dma_desc *desc;
451 LIST_HEAD(tmp_list);
452 int i;
453
454 if (!pdc_is_idle(pd_chan)) {
455 dev_dbg(chan2dev(chan), "DMA channel not idle ?\n");
456 return -EIO;
457 }
458
459 if (!list_empty(&pd_chan->free_list))
460 return pd_chan->descs_allocated;
461
462 for (i = 0; i < init_nr_desc_per_channel; i++) {
463 desc = pdc_alloc_desc(chan, GFP_KERNEL);
464
465 if (!desc) {
466 dev_warn(chan2dev(chan),
467 "Only allocated %d initial descriptors\n", i);
468 break;
469 }
470
471 list_add_tail(&desc->desc_node, &tmp_list);
472 }
473
474 spin_lock_bh(&pd_chan->lock);
475 list_splice(&tmp_list, &pd_chan->free_list);
476 pd_chan->descs_allocated = i;
477 pd_chan->completed_cookie = chan->cookie = 1;
478 spin_unlock_bh(&pd_chan->lock);
479
480 pdc_enable_irq(chan, 1);
481 pdc_set_dir(chan);
482
483 return pd_chan->descs_allocated;
484 }
485
486 static void pd_free_chan_resources(struct dma_chan *chan)
487 {
488 struct pch_dma_chan *pd_chan = to_pd_chan(chan);
489 struct pch_dma *pd = to_pd(chan->device);
490 struct pch_dma_desc *desc, *_d;
491 LIST_HEAD(tmp_list);
492
493 BUG_ON(!pdc_is_idle(pd_chan));
494 BUG_ON(!list_empty(&pd_chan->active_list));
495 BUG_ON(!list_empty(&pd_chan->queue));
496
497 spin_lock_bh(&pd_chan->lock);
498 list_splice_init(&pd_chan->free_list, &tmp_list);
499 pd_chan->descs_allocated = 0;
500 spin_unlock_bh(&pd_chan->lock);
501
502 list_for_each_entry_safe(desc, _d, &tmp_list, desc_node)
503 pci_pool_free(pd->pool, desc, desc->txd.phys);
504
505 pdc_enable_irq(chan, 0);
506 }
507
508 static enum dma_status pd_tx_status(struct dma_chan *chan, dma_cookie_t cookie,
509 struct dma_tx_state *txstate)
510 {
511 struct pch_dma_chan *pd_chan = to_pd_chan(chan);
512 dma_cookie_t last_used;
513 dma_cookie_t last_completed;
514 int ret;
515
516 spin_lock_bh(&pd_chan->lock);
517 last_completed = pd_chan->completed_cookie;
518 last_used = chan->cookie;
519 spin_unlock_bh(&pd_chan->lock);
520
521 ret = dma_async_is_complete(cookie, last_completed, last_used);
522
523 dma_set_tx_state(txstate, last_completed, last_used, 0);
524
525 return ret;
526 }
527
528 static void pd_issue_pending(struct dma_chan *chan)
529 {
530 struct pch_dma_chan *pd_chan = to_pd_chan(chan);
531
532 if (pdc_is_idle(pd_chan)) {
533 spin_lock(&pd_chan->lock);
534 pdc_advance_work(pd_chan);
535 spin_unlock(&pd_chan->lock);
536 }
537 }
538
539 static struct dma_async_tx_descriptor *pd_prep_slave_sg(struct dma_chan *chan,
540 struct scatterlist *sgl, unsigned int sg_len,
541 enum dma_data_direction direction, unsigned long flags)
542 {
543 struct pch_dma_chan *pd_chan = to_pd_chan(chan);
544 struct pch_dma_slave *pd_slave = chan->private;
545 struct pch_dma_desc *first = NULL;
546 struct pch_dma_desc *prev = NULL;
547 struct pch_dma_desc *desc = NULL;
548 struct scatterlist *sg;
549 dma_addr_t reg;
550 int i;
551
552 if (unlikely(!sg_len)) {
553 dev_info(chan2dev(chan), "prep_slave_sg: length is zero!\n");
554 return NULL;
555 }
556
557 if (direction == DMA_FROM_DEVICE)
558 reg = pd_slave->rx_reg;
559 else if (direction == DMA_TO_DEVICE)
560 reg = pd_slave->tx_reg;
561 else
562 return NULL;
563
564 for_each_sg(sgl, sg, sg_len, i) {
565 desc = pdc_desc_get(pd_chan);
566
567 if (!desc)
568 goto err_desc_get;
569
570 desc->regs.dev_addr = reg;
571 desc->regs.mem_addr = sg_phys(sg);
572 desc->regs.size = sg_dma_len(sg);
573 desc->regs.next = DMA_DESC_FOLLOW_WITHOUT_IRQ;
574
575 switch (pd_slave->width) {
576 case PCH_DMA_WIDTH_1_BYTE:
577 if (desc->regs.size > DMA_DESC_MAX_COUNT_1_BYTE)
578 goto err_desc_get;
579 desc->regs.size |= DMA_DESC_WIDTH_1_BYTE;
580 break;
581 case PCH_DMA_WIDTH_2_BYTES:
582 if (desc->regs.size > DMA_DESC_MAX_COUNT_2_BYTES)
583 goto err_desc_get;
584 desc->regs.size |= DMA_DESC_WIDTH_2_BYTES;
585 break;
586 case PCH_DMA_WIDTH_4_BYTES:
587 if (desc->regs.size > DMA_DESC_MAX_COUNT_4_BYTES)
588 goto err_desc_get;
589 desc->regs.size |= DMA_DESC_WIDTH_4_BYTES;
590 break;
591 default:
592 goto err_desc_get;
593 }
594
595 if (!first) {
596 first = desc;
597 } else {
598 prev->regs.next |= desc->txd.phys;
599 list_add_tail(&desc->desc_node, &first->tx_list);
600 }
601
602 prev = desc;
603 }
604
605 if (flags & DMA_PREP_INTERRUPT)
606 desc->regs.next = DMA_DESC_END_WITH_IRQ;
607 else
608 desc->regs.next = DMA_DESC_END_WITHOUT_IRQ;
609
610 first->txd.cookie = -EBUSY;
611 desc->txd.flags = flags;
612
613 return &first->txd;
614
615 err_desc_get:
616 dev_err(chan2dev(chan), "failed to get desc or wrong parameters\n");
617 pdc_desc_put(pd_chan, first);
618 return NULL;
619 }
620
621 static int pd_device_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
622 unsigned long arg)
623 {
624 struct pch_dma_chan *pd_chan = to_pd_chan(chan);
625 struct pch_dma_desc *desc, *_d;
626 LIST_HEAD(list);
627
628 if (cmd != DMA_TERMINATE_ALL)
629 return -ENXIO;
630
631 spin_lock_bh(&pd_chan->lock);
632
633 pdc_set_mode(&pd_chan->chan, DMA_CTL0_DISABLE);
634
635 list_splice_init(&pd_chan->active_list, &list);
636 list_splice_init(&pd_chan->queue, &list);
637
638 list_for_each_entry_safe(desc, _d, &list, desc_node)
639 pdc_chain_complete(pd_chan, desc);
640
641 spin_unlock_bh(&pd_chan->lock);
642
643 return 0;
644 }
645
646 static void pdc_tasklet(unsigned long data)
647 {
648 struct pch_dma_chan *pd_chan = (struct pch_dma_chan *)data;
649 unsigned long flags;
650
651 if (!pdc_is_idle(pd_chan)) {
652 dev_err(chan2dev(&pd_chan->chan),
653 "BUG: handle non-idle channel in tasklet\n");
654 return;
655 }
656
657 spin_lock_irqsave(&pd_chan->lock, flags);
658 if (test_and_clear_bit(0, &pd_chan->err_status))
659 pdc_handle_error(pd_chan);
660 else
661 pdc_advance_work(pd_chan);
662 spin_unlock_irqrestore(&pd_chan->lock, flags);
663 }
664
665 static irqreturn_t pd_irq(int irq, void *devid)
666 {
667 struct pch_dma *pd = (struct pch_dma *)devid;
668 struct pch_dma_chan *pd_chan;
669 u32 sts0;
670 int i;
671 int ret = IRQ_NONE;
672
673 sts0 = dma_readl(pd, STS0);
674
675 dev_dbg(pd->dma.dev, "pd_irq sts0: %x\n", sts0);
676
677 for (i = 0; i < pd->dma.chancnt; i++) {
678 pd_chan = &pd->channels[i];
679
680 if (sts0 & DMA_STATUS_IRQ(i)) {
681 if (sts0 & DMA_STATUS_ERR(i))
682 set_bit(0, &pd_chan->err_status);
683
684 tasklet_schedule(&pd_chan->tasklet);
685 ret = IRQ_HANDLED;
686 }
687
688 }
689
690 /* clear interrupt bits in status register */
691 dma_writel(pd, STS0, sts0);
692
693 return ret;
694 }
695
696 #ifdef CONFIG_PM
697 static void pch_dma_save_regs(struct pch_dma *pd)
698 {
699 struct pch_dma_chan *pd_chan;
700 struct dma_chan *chan, *_c;
701 int i = 0;
702
703 pd->regs.dma_ctl0 = dma_readl(pd, CTL0);
704 pd->regs.dma_ctl1 = dma_readl(pd, CTL1);
705 pd->regs.dma_ctl2 = dma_readl(pd, CTL2);
706
707 list_for_each_entry_safe(chan, _c, &pd->dma.channels, device_node) {
708 pd_chan = to_pd_chan(chan);
709
710 pd->ch_regs[i].dev_addr = channel_readl(pd_chan, DEV_ADDR);
711 pd->ch_regs[i].mem_addr = channel_readl(pd_chan, MEM_ADDR);
712 pd->ch_regs[i].size = channel_readl(pd_chan, SIZE);
713 pd->ch_regs[i].next = channel_readl(pd_chan, NEXT);
714
715 i++;
716 }
717 }
718
719 static void pch_dma_restore_regs(struct pch_dma *pd)
720 {
721 struct pch_dma_chan *pd_chan;
722 struct dma_chan *chan, *_c;
723 int i = 0;
724
725 dma_writel(pd, CTL0, pd->regs.dma_ctl0);
726 dma_writel(pd, CTL1, pd->regs.dma_ctl1);
727 dma_writel(pd, CTL2, pd->regs.dma_ctl2);
728
729 list_for_each_entry_safe(chan, _c, &pd->dma.channels, device_node) {
730 pd_chan = to_pd_chan(chan);
731
732 channel_writel(pd_chan, DEV_ADDR, pd->ch_regs[i].dev_addr);
733 channel_writel(pd_chan, MEM_ADDR, pd->ch_regs[i].mem_addr);
734 channel_writel(pd_chan, SIZE, pd->ch_regs[i].size);
735 channel_writel(pd_chan, NEXT, pd->ch_regs[i].next);
736
737 i++;
738 }
739 }
740
741 static int pch_dma_suspend(struct pci_dev *pdev, pm_message_t state)
742 {
743 struct pch_dma *pd = pci_get_drvdata(pdev);
744
745 if (pd)
746 pch_dma_save_regs(pd);
747
748 pci_save_state(pdev);
749 pci_disable_device(pdev);
750 pci_set_power_state(pdev, pci_choose_state(pdev, state));
751
752 return 0;
753 }
754
755 static int pch_dma_resume(struct pci_dev *pdev)
756 {
757 struct pch_dma *pd = pci_get_drvdata(pdev);
758 int err;
759
760 pci_set_power_state(pdev, PCI_D0);
761 pci_restore_state(pdev);
762
763 err = pci_enable_device(pdev);
764 if (err) {
765 dev_dbg(&pdev->dev, "failed to enable device\n");
766 return err;
767 }
768
769 if (pd)
770 pch_dma_restore_regs(pd);
771
772 return 0;
773 }
774 #endif
775
776 static int __devinit pch_dma_probe(struct pci_dev *pdev,
777 const struct pci_device_id *id)
778 {
779 struct pch_dma *pd;
780 struct pch_dma_regs *regs;
781 unsigned int nr_channels;
782 int err;
783 int i;
784
785 nr_channels = id->driver_data;
786 pd = kzalloc(sizeof(struct pch_dma)+
787 sizeof(struct pch_dma_chan) * nr_channels, GFP_KERNEL);
788 if (!pd)
789 return -ENOMEM;
790
791 pci_set_drvdata(pdev, pd);
792
793 err = pci_enable_device(pdev);
794 if (err) {
795 dev_err(&pdev->dev, "Cannot enable PCI device\n");
796 goto err_free_mem;
797 }
798
799 if (!(pci_resource_flags(pdev, 1) & IORESOURCE_MEM)) {
800 dev_err(&pdev->dev, "Cannot find proper base address\n");
801 goto err_disable_pdev;
802 }
803
804 err = pci_request_regions(pdev, DRV_NAME);
805 if (err) {
806 dev_err(&pdev->dev, "Cannot obtain PCI resources\n");
807 goto err_disable_pdev;
808 }
809
810 err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
811 if (err) {
812 dev_err(&pdev->dev, "Cannot set proper DMA config\n");
813 goto err_free_res;
814 }
815
816 regs = pd->membase = pci_iomap(pdev, 1, 0);
817 if (!pd->membase) {
818 dev_err(&pdev->dev, "Cannot map MMIO registers\n");
819 err = -ENOMEM;
820 goto err_free_res;
821 }
822
823 pci_set_master(pdev);
824
825 err = request_irq(pdev->irq, pd_irq, IRQF_SHARED, DRV_NAME, pd);
826 if (err) {
827 dev_err(&pdev->dev, "Failed to request IRQ\n");
828 goto err_iounmap;
829 }
830
831 pd->pool = pci_pool_create("pch_dma_desc_pool", pdev,
832 sizeof(struct pch_dma_desc), 4, 0);
833 if (!pd->pool) {
834 dev_err(&pdev->dev, "Failed to alloc DMA descriptors\n");
835 err = -ENOMEM;
836 goto err_free_irq;
837 }
838
839 pd->dma.dev = &pdev->dev;
840 pd->dma.chancnt = nr_channels;
841
842 INIT_LIST_HEAD(&pd->dma.channels);
843
844 for (i = 0; i < nr_channels; i++) {
845 struct pch_dma_chan *pd_chan = &pd->channels[i];
846
847 pd_chan->chan.device = &pd->dma;
848 pd_chan->chan.cookie = 1;
849 pd_chan->chan.chan_id = i;
850
851 pd_chan->membase = &regs->desc[i];
852
853 pd_chan->dir = (i % 2) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
854
855 spin_lock_init(&pd_chan->lock);
856
857 INIT_LIST_HEAD(&pd_chan->active_list);
858 INIT_LIST_HEAD(&pd_chan->queue);
859 INIT_LIST_HEAD(&pd_chan->free_list);
860
861 tasklet_init(&pd_chan->tasklet, pdc_tasklet,
862 (unsigned long)pd_chan);
863 list_add_tail(&pd_chan->chan.device_node, &pd->dma.channels);
864 }
865
866 dma_cap_zero(pd->dma.cap_mask);
867 dma_cap_set(DMA_PRIVATE, pd->dma.cap_mask);
868 dma_cap_set(DMA_SLAVE, pd->dma.cap_mask);
869
870 pd->dma.device_alloc_chan_resources = pd_alloc_chan_resources;
871 pd->dma.device_free_chan_resources = pd_free_chan_resources;
872 pd->dma.device_tx_status = pd_tx_status;
873 pd->dma.device_issue_pending = pd_issue_pending;
874 pd->dma.device_prep_slave_sg = pd_prep_slave_sg;
875 pd->dma.device_control = pd_device_control;
876
877 err = dma_async_device_register(&pd->dma);
878 if (err) {
879 dev_err(&pdev->dev, "Failed to register DMA device\n");
880 goto err_free_pool;
881 }
882
883 return 0;
884
885 err_free_pool:
886 pci_pool_destroy(pd->pool);
887 err_free_irq:
888 free_irq(pdev->irq, pd);
889 err_iounmap:
890 pci_iounmap(pdev, pd->membase);
891 err_free_res:
892 pci_release_regions(pdev);
893 err_disable_pdev:
894 pci_disable_device(pdev);
895 err_free_mem:
896 return err;
897 }
898
899 static void __devexit pch_dma_remove(struct pci_dev *pdev)
900 {
901 struct pch_dma *pd = pci_get_drvdata(pdev);
902 struct pch_dma_chan *pd_chan;
903 struct dma_chan *chan, *_c;
904
905 if (pd) {
906 dma_async_device_unregister(&pd->dma);
907
908 list_for_each_entry_safe(chan, _c, &pd->dma.channels,
909 device_node) {
910 pd_chan = to_pd_chan(chan);
911
912 tasklet_disable(&pd_chan->tasklet);
913 tasklet_kill(&pd_chan->tasklet);
914 }
915
916 pci_pool_destroy(pd->pool);
917 free_irq(pdev->irq, pd);
918 pci_iounmap(pdev, pd->membase);
919 pci_release_regions(pdev);
920 pci_disable_device(pdev);
921 kfree(pd);
922 }
923 }
924
925 /* PCI Device ID of DMA device */
926 #define PCI_VENDOR_ID_ROHM 0x10DB
927 #define PCI_DEVICE_ID_EG20T_PCH_DMA_8CH 0x8810
928 #define PCI_DEVICE_ID_EG20T_PCH_DMA_4CH 0x8815
929 #define PCI_DEVICE_ID_ML7213_DMA1_8CH 0x8026
930 #define PCI_DEVICE_ID_ML7213_DMA2_8CH 0x802B
931 #define PCI_DEVICE_ID_ML7213_DMA3_4CH 0x8034
932
933 static const struct pci_device_id pch_dma_id_table[] = {
934 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_EG20T_PCH_DMA_8CH), 8 },
935 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_EG20T_PCH_DMA_4CH), 4 },
936 { PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7213_DMA1_8CH), 8}, /* UART Video */
937 { PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7213_DMA2_8CH), 8}, /* PCMIF SPI */
938 { PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7213_DMA3_4CH), 4}, /* FPGA */
939 { 0, },
940 };
941
942 static struct pci_driver pch_dma_driver = {
943 .name = DRV_NAME,
944 .id_table = pch_dma_id_table,
945 .probe = pch_dma_probe,
946 .remove = __devexit_p(pch_dma_remove),
947 #ifdef CONFIG_PM
948 .suspend = pch_dma_suspend,
949 .resume = pch_dma_resume,
950 #endif
951 };
952
953 static int __init pch_dma_init(void)
954 {
955 return pci_register_driver(&pch_dma_driver);
956 }
957
958 static void __exit pch_dma_exit(void)
959 {
960 pci_unregister_driver(&pch_dma_driver);
961 }
962
963 module_init(pch_dma_init);
964 module_exit(pch_dma_exit);
965
966 MODULE_DESCRIPTION("Intel EG20T PCH / OKI SEMICONDUCTOR ML7213 IOH "
967 "DMA controller driver");
968 MODULE_AUTHOR("Yong Wang <yong.y.wang@intel.com>");
969 MODULE_LICENSE("GPL v2");
linux-next