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PM / sleep: Asynchronous threads for suspend_noirq
[linux/fpc-iii.git] / drivers / dma / mmp_pdma.c
blobb439679f4126e98dcd6484607971276b2baf512f
1 /*
2 * Copyright 2012 Marvell International Ltd.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 */
8
9 #include <linux/err.h>
10 #include <linux/module.h>
11 #include <linux/init.h>
12 #include <linux/types.h>
13 #include <linux/interrupt.h>
14 #include <linux/dma-mapping.h>
15 #include <linux/slab.h>
16 #include <linux/dmaengine.h>
17 #include <linux/platform_device.h>
18 #include <linux/device.h>
19 #include <linux/platform_data/mmp_dma.h>
20 #include <linux/dmapool.h>
21 #include <linux/of_device.h>
22 #include <linux/of_dma.h>
23 #include <linux/of.h>
24 #include <linux/dma/mmp-pdma.h>
25
26 #include "dmaengine.h"
27
28 #define DCSR 0x0000
29 #define DALGN 0x00a0
30 #define DINT 0x00f0
31 #define DDADR 0x0200
32 #define DSADR 0x0204
33 #define DTADR 0x0208
34 #define DCMD 0x020c
35
36 #define DCSR_RUN BIT(31) /* Run Bit (read / write) */
37 #define DCSR_NODESC BIT(30) /* No-Descriptor Fetch (read / write) */
38 #define DCSR_STOPIRQEN BIT(29) /* Stop Interrupt Enable (read / write) */
39 #define DCSR_REQPEND BIT(8) /* Request Pending (read-only) */
40 #define DCSR_STOPSTATE BIT(3) /* Stop State (read-only) */
41 #define DCSR_ENDINTR BIT(2) /* End Interrupt (read / write) */
42 #define DCSR_STARTINTR BIT(1) /* Start Interrupt (read / write) */
43 #define DCSR_BUSERR BIT(0) /* Bus Error Interrupt (read / write) */
44
45 #define DCSR_EORIRQEN BIT(28) /* End of Receive Interrupt Enable (R/W) */
46 #define DCSR_EORJMPEN BIT(27) /* Jump to next descriptor on EOR */
47 #define DCSR_EORSTOPEN BIT(26) /* STOP on an EOR */
48 #define DCSR_SETCMPST BIT(25) /* Set Descriptor Compare Status */
49 #define DCSR_CLRCMPST BIT(24) /* Clear Descriptor Compare Status */
50 #define DCSR_CMPST BIT(10) /* The Descriptor Compare Status */
51 #define DCSR_EORINTR BIT(9) /* The end of Receive */
52
53 #define DRCMR(n) ((((n) < 64) ? 0x0100 : 0x1100) + (((n) & 0x3f) << 2))
54 #define DRCMR_MAPVLD BIT(7) /* Map Valid (read / write) */
55 #define DRCMR_CHLNUM 0x1f /* mask for Channel Number (read / write) */
56
57 #define DDADR_DESCADDR 0xfffffff0 /* Address of next descriptor (mask) */
58 #define DDADR_STOP BIT(0) /* Stop (read / write) */
59
60 #define DCMD_INCSRCADDR BIT(31) /* Source Address Increment Setting. */
61 #define DCMD_INCTRGADDR BIT(30) /* Target Address Increment Setting. */
62 #define DCMD_FLOWSRC BIT(29) /* Flow Control by the source. */
63 #define DCMD_FLOWTRG BIT(28) /* Flow Control by the target. */
64 #define DCMD_STARTIRQEN BIT(22) /* Start Interrupt Enable */
65 #define DCMD_ENDIRQEN BIT(21) /* End Interrupt Enable */
66 #define DCMD_ENDIAN BIT(18) /* Device Endian-ness. */
67 #define DCMD_BURST8 (1 << 16) /* 8 byte burst */
68 #define DCMD_BURST16 (2 << 16) /* 16 byte burst */
69 #define DCMD_BURST32 (3 << 16) /* 32 byte burst */
70 #define DCMD_WIDTH1 (1 << 14) /* 1 byte width */
71 #define DCMD_WIDTH2 (2 << 14) /* 2 byte width (HalfWord) */
72 #define DCMD_WIDTH4 (3 << 14) /* 4 byte width (Word) */
73 #define DCMD_LENGTH 0x01fff /* length mask (max = 8K - 1) */
74
75 #define PDMA_ALIGNMENT 3
76 #define PDMA_MAX_DESC_BYTES DCMD_LENGTH
77
78 struct mmp_pdma_desc_hw {
79 u32 ddadr; /* Points to the next descriptor + flags */
80 u32 dsadr; /* DSADR value for the current transfer */
81 u32 dtadr; /* DTADR value for the current transfer */
82 u32 dcmd; /* DCMD value for the current transfer */
83 } __aligned(32);
84
85 struct mmp_pdma_desc_sw {
86 struct mmp_pdma_desc_hw desc;
87 struct list_head node;
88 struct list_head tx_list;
89 struct dma_async_tx_descriptor async_tx;
90 };
91
92 struct mmp_pdma_phy;
93
94 struct mmp_pdma_chan {
95 struct device *dev;
96 struct dma_chan chan;
97 struct dma_async_tx_descriptor desc;
98 struct mmp_pdma_phy *phy;
99 enum dma_transfer_direction dir;
100
101 struct mmp_pdma_desc_sw *cyclic_first; /* first desc_sw if channel
102 * is in cyclic mode */
103
104 /* channel's basic info */
105 struct tasklet_struct tasklet;
106 u32 dcmd;
107 u32 drcmr;
108 u32 dev_addr;
109
110 /* list for desc */
111 spinlock_t desc_lock; /* Descriptor list lock */
112 struct list_head chain_pending; /* Link descriptors queue for pending */
113 struct list_head chain_running; /* Link descriptors queue for running */
114 bool idle; /* channel statue machine */
115 bool byte_align;
116
117 struct dma_pool *desc_pool; /* Descriptors pool */
118 };
119
120 struct mmp_pdma_phy {
121 int idx;
122 void __iomem *base;
123 struct mmp_pdma_chan *vchan;
124 };
125
126 struct mmp_pdma_device {
127 int dma_channels;
128 void __iomem *base;
129 struct device *dev;
130 struct dma_device device;
131 struct mmp_pdma_phy *phy;
132 spinlock_t phy_lock; /* protect alloc/free phy channels */
133 };
134
135 #define tx_to_mmp_pdma_desc(tx) \
136 container_of(tx, struct mmp_pdma_desc_sw, async_tx)
137 #define to_mmp_pdma_desc(lh) \
138 container_of(lh, struct mmp_pdma_desc_sw, node)
139 #define to_mmp_pdma_chan(dchan) \
140 container_of(dchan, struct mmp_pdma_chan, chan)
141 #define to_mmp_pdma_dev(dmadev) \
142 container_of(dmadev, struct mmp_pdma_device, device)
143
144 static void set_desc(struct mmp_pdma_phy *phy, dma_addr_t addr)
145 {
146 u32 reg = (phy->idx << 4) + DDADR;
147
148 writel(addr, phy->base + reg);
149 }
150
151 static void enable_chan(struct mmp_pdma_phy *phy)
152 {
153 u32 reg, dalgn;
154
155 if (!phy->vchan)
156 return;
157
158 reg = DRCMR(phy->vchan->drcmr);
159 writel(DRCMR_MAPVLD | phy->idx, phy->base + reg);
160
161 dalgn = readl(phy->base + DALGN);
162 if (phy->vchan->byte_align)
163 dalgn |= 1 << phy->idx;
164 else
165 dalgn &= ~(1 << phy->idx);
166 writel(dalgn, phy->base + DALGN);
167
168 reg = (phy->idx << 2) + DCSR;
169 writel(readl(phy->base + reg) | DCSR_RUN, phy->base + reg);
170 }
171
172 static void disable_chan(struct mmp_pdma_phy *phy)
173 {
174 u32 reg;
175
176 if (!phy)
177 return;
178
179 reg = (phy->idx << 2) + DCSR;
180 writel(readl(phy->base + reg) & ~DCSR_RUN, phy->base + reg);
181 }
182
183 static int clear_chan_irq(struct mmp_pdma_phy *phy)
184 {
185 u32 dcsr;
186 u32 dint = readl(phy->base + DINT);
187 u32 reg = (phy->idx << 2) + DCSR;
188
189 if (!(dint & BIT(phy->idx)))
190 return -EAGAIN;
191
192 /* clear irq */
193 dcsr = readl(phy->base + reg);
194 writel(dcsr, phy->base + reg);
195 if ((dcsr & DCSR_BUSERR) && (phy->vchan))
196 dev_warn(phy->vchan->dev, "DCSR_BUSERR\n");
197
198 return 0;
199 }
200
201 static irqreturn_t mmp_pdma_chan_handler(int irq, void *dev_id)
202 {
203 struct mmp_pdma_phy *phy = dev_id;
204
205 if (clear_chan_irq(phy) != 0)
206 return IRQ_NONE;
207
208 tasklet_schedule(&phy->vchan->tasklet);
209 return IRQ_HANDLED;
210 }
211
212 static irqreturn_t mmp_pdma_int_handler(int irq, void *dev_id)
213 {
214 struct mmp_pdma_device *pdev = dev_id;
215 struct mmp_pdma_phy *phy;
216 u32 dint = readl(pdev->base + DINT);
217 int i, ret;
218 int irq_num = 0;
219
220 while (dint) {
221 i = __ffs(dint);
222 dint &= (dint - 1);
223 phy = &pdev->phy[i];
224 ret = mmp_pdma_chan_handler(irq, phy);
225 if (ret == IRQ_HANDLED)
226 irq_num++;
227 }
228
229 if (irq_num)
230 return IRQ_HANDLED;
231
232 return IRQ_NONE;
233 }
234
235 /* lookup free phy channel as descending priority */
236 static struct mmp_pdma_phy *lookup_phy(struct mmp_pdma_chan *pchan)
237 {
238 int prio, i;
239 struct mmp_pdma_device *pdev = to_mmp_pdma_dev(pchan->chan.device);
240 struct mmp_pdma_phy *phy, *found = NULL;
241 unsigned long flags;
242
243 /*
244 * dma channel priorities
245 * ch 0 - 3, 16 - 19 <--> (0)
246 * ch 4 - 7, 20 - 23 <--> (1)
247 * ch 8 - 11, 24 - 27 <--> (2)
248 * ch 12 - 15, 28 - 31 <--> (3)
249 */
250
251 spin_lock_irqsave(&pdev->phy_lock, flags);
252 for (prio = 0; prio <= ((pdev->dma_channels - 1) & 0xf) >> 2; prio++) {
253 for (i = 0; i < pdev->dma_channels; i++) {
254 if (prio != (i & 0xf) >> 2)
255 continue;
256 phy = &pdev->phy[i];
257 if (!phy->vchan) {
258 phy->vchan = pchan;
259 found = phy;
260 goto out_unlock;
261 }
262 }
263 }
264
265 out_unlock:
266 spin_unlock_irqrestore(&pdev->phy_lock, flags);
267 return found;
268 }
269
270 static void mmp_pdma_free_phy(struct mmp_pdma_chan *pchan)
271 {
272 struct mmp_pdma_device *pdev = to_mmp_pdma_dev(pchan->chan.device);
273 unsigned long flags;
274 u32 reg;
275
276 if (!pchan->phy)
277 return;
278
279 /* clear the channel mapping in DRCMR */
280 reg = DRCMR(pchan->phy->vchan->drcmr);
281 writel(0, pchan->phy->base + reg);
282
283 spin_lock_irqsave(&pdev->phy_lock, flags);
284 pchan->phy->vchan = NULL;
285 pchan->phy = NULL;
286 spin_unlock_irqrestore(&pdev->phy_lock, flags);
287 }
288
289 /**
290 * start_pending_queue - transfer any pending transactions
291 * pending list ==> running list
292 */
293 static void start_pending_queue(struct mmp_pdma_chan *chan)
294 {
295 struct mmp_pdma_desc_sw *desc;
296
297 /* still in running, irq will start the pending list */
298 if (!chan->idle) {
299 dev_dbg(chan->dev, "DMA controller still busy\n");
300 return;
301 }
302
303 if (list_empty(&chan->chain_pending)) {
304 /* chance to re-fetch phy channel with higher prio */
305 mmp_pdma_free_phy(chan);
306 dev_dbg(chan->dev, "no pending list\n");
307 return;
308 }
309
310 if (!chan->phy) {
311 chan->phy = lookup_phy(chan);
312 if (!chan->phy) {
313 dev_dbg(chan->dev, "no free dma channel\n");
314 return;
315 }
316 }
317
318 /*
319 * pending -> running
320 * reintilize pending list
321 */
322 desc = list_first_entry(&chan->chain_pending,
323 struct mmp_pdma_desc_sw, node);
324 list_splice_tail_init(&chan->chain_pending, &chan->chain_running);
325
326 /*
327 * Program the descriptor's address into the DMA controller,
328 * then start the DMA transaction
329 */
330 set_desc(chan->phy, desc->async_tx.phys);
331 enable_chan(chan->phy);
332 chan->idle = false;
333 }
334
335
336 /* desc->tx_list ==> pending list */
337 static dma_cookie_t mmp_pdma_tx_submit(struct dma_async_tx_descriptor *tx)
338 {
339 struct mmp_pdma_chan *chan = to_mmp_pdma_chan(tx->chan);
340 struct mmp_pdma_desc_sw *desc = tx_to_mmp_pdma_desc(tx);
341 struct mmp_pdma_desc_sw *child;
342 unsigned long flags;
343 dma_cookie_t cookie = -EBUSY;
344
345 spin_lock_irqsave(&chan->desc_lock, flags);
346
347 list_for_each_entry(child, &desc->tx_list, node) {
348 cookie = dma_cookie_assign(&child->async_tx);
349 }
350
351 /* softly link to pending list - desc->tx_list ==> pending list */
352 list_splice_tail_init(&desc->tx_list, &chan->chain_pending);
353
354 spin_unlock_irqrestore(&chan->desc_lock, flags);
355
356 return cookie;
357 }
358
359 static struct mmp_pdma_desc_sw *
360 mmp_pdma_alloc_descriptor(struct mmp_pdma_chan *chan)
361 {
362 struct mmp_pdma_desc_sw *desc;
363 dma_addr_t pdesc;
364
365 desc = dma_pool_alloc(chan->desc_pool, GFP_ATOMIC, &pdesc);
366 if (!desc) {
367 dev_err(chan->dev, "out of memory for link descriptor\n");
368 return NULL;
369 }
370
371 memset(desc, 0, sizeof(*desc));
372 INIT_LIST_HEAD(&desc->tx_list);
373 dma_async_tx_descriptor_init(&desc->async_tx, &chan->chan);
374 /* each desc has submit */
375 desc->async_tx.tx_submit = mmp_pdma_tx_submit;
376 desc->async_tx.phys = pdesc;
377
378 return desc;
379 }
380
381 /**
382 * mmp_pdma_alloc_chan_resources - Allocate resources for DMA channel.
383 *
384 * This function will create a dma pool for descriptor allocation.
385 * Request irq only when channel is requested
386 * Return - The number of allocated descriptors.
387 */
388
389 static int mmp_pdma_alloc_chan_resources(struct dma_chan *dchan)
390 {
391 struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan);
392
393 if (chan->desc_pool)
394 return 1;
395
396 chan->desc_pool = dma_pool_create(dev_name(&dchan->dev->device),
397 chan->dev,
398 sizeof(struct mmp_pdma_desc_sw),
399 __alignof__(struct mmp_pdma_desc_sw),
400 0);
401 if (!chan->desc_pool) {
402 dev_err(chan->dev, "unable to allocate descriptor pool\n");
403 return -ENOMEM;
404 }
405
406 mmp_pdma_free_phy(chan);
407 chan->idle = true;
408 chan->dev_addr = 0;
409 return 1;
410 }
411
412 static void mmp_pdma_free_desc_list(struct mmp_pdma_chan *chan,
413 struct list_head *list)
414 {
415 struct mmp_pdma_desc_sw *desc, *_desc;
416
417 list_for_each_entry_safe(desc, _desc, list, node) {
418 list_del(&desc->node);
419 dma_pool_free(chan->desc_pool, desc, desc->async_tx.phys);
420 }
421 }
422
423 static void mmp_pdma_free_chan_resources(struct dma_chan *dchan)
424 {
425 struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan);
426 unsigned long flags;
427
428 spin_lock_irqsave(&chan->desc_lock, flags);
429 mmp_pdma_free_desc_list(chan, &chan->chain_pending);
430 mmp_pdma_free_desc_list(chan, &chan->chain_running);
431 spin_unlock_irqrestore(&chan->desc_lock, flags);
432
433 dma_pool_destroy(chan->desc_pool);
434 chan->desc_pool = NULL;
435 chan->idle = true;
436 chan->dev_addr = 0;
437 mmp_pdma_free_phy(chan);
438 return;
439 }
440
441 static struct dma_async_tx_descriptor *
442 mmp_pdma_prep_memcpy(struct dma_chan *dchan,
443 dma_addr_t dma_dst, dma_addr_t dma_src,
444 size_t len, unsigned long flags)
445 {
446 struct mmp_pdma_chan *chan;
447 struct mmp_pdma_desc_sw *first = NULL, *prev = NULL, *new;
448 size_t copy = 0;
449
450 if (!dchan)
451 return NULL;
452
453 if (!len)
454 return NULL;
455
456 chan = to_mmp_pdma_chan(dchan);
457 chan->byte_align = false;
458
459 if (!chan->dir) {
460 chan->dir = DMA_MEM_TO_MEM;
461 chan->dcmd = DCMD_INCTRGADDR | DCMD_INCSRCADDR;
462 chan->dcmd |= DCMD_BURST32;
463 }
464
465 do {
466 /* Allocate the link descriptor from DMA pool */
467 new = mmp_pdma_alloc_descriptor(chan);
468 if (!new) {
469 dev_err(chan->dev, "no memory for desc\n");
470 goto fail;
471 }
472
473 copy = min_t(size_t, len, PDMA_MAX_DESC_BYTES);
474 if (dma_src & 0x7 || dma_dst & 0x7)
475 chan->byte_align = true;
476
477 new->desc.dcmd = chan->dcmd | (DCMD_LENGTH & copy);
478 new->desc.dsadr = dma_src;
479 new->desc.dtadr = dma_dst;
480
481 if (!first)
482 first = new;
483 else
484 prev->desc.ddadr = new->async_tx.phys;
485
486 new->async_tx.cookie = 0;
487 async_tx_ack(&new->async_tx);
488
489 prev = new;
490 len -= copy;
491
492 if (chan->dir == DMA_MEM_TO_DEV) {
493 dma_src += copy;
494 } else if (chan->dir == DMA_DEV_TO_MEM) {
495 dma_dst += copy;
496 } else if (chan->dir == DMA_MEM_TO_MEM) {
497 dma_src += copy;
498 dma_dst += copy;
499 }
500
501 /* Insert the link descriptor to the LD ring */
502 list_add_tail(&new->node, &first->tx_list);
503 } while (len);
504
505 first->async_tx.flags = flags; /* client is in control of this ack */
506 first->async_tx.cookie = -EBUSY;
507
508 /* last desc and fire IRQ */
509 new->desc.ddadr = DDADR_STOP;
510 new->desc.dcmd |= DCMD_ENDIRQEN;
511
512 chan->cyclic_first = NULL;
513
514 return &first->async_tx;
515
516 fail:
517 if (first)
518 mmp_pdma_free_desc_list(chan, &first->tx_list);
519 return NULL;
520 }
521
522 static struct dma_async_tx_descriptor *
523 mmp_pdma_prep_slave_sg(struct dma_chan *dchan, struct scatterlist *sgl,
524 unsigned int sg_len, enum dma_transfer_direction dir,
525 unsigned long flags, void *context)
526 {
527 struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan);
528 struct mmp_pdma_desc_sw *first = NULL, *prev = NULL, *new = NULL;
529 size_t len, avail;
530 struct scatterlist *sg;
531 dma_addr_t addr;
532 int i;
533
534 if ((sgl == NULL) || (sg_len == 0))
535 return NULL;
536
537 chan->byte_align = false;
538
539 for_each_sg(sgl, sg, sg_len, i) {
540 addr = sg_dma_address(sg);
541 avail = sg_dma_len(sgl);
542
543 do {
544 len = min_t(size_t, avail, PDMA_MAX_DESC_BYTES);
545 if (addr & 0x7)
546 chan->byte_align = true;
547
548 /* allocate and populate the descriptor */
549 new = mmp_pdma_alloc_descriptor(chan);
550 if (!new) {
551 dev_err(chan->dev, "no memory for desc\n");
552 goto fail;
553 }
554
555 new->desc.dcmd = chan->dcmd | (DCMD_LENGTH & len);
556 if (dir == DMA_MEM_TO_DEV) {
557 new->desc.dsadr = addr;
558 new->desc.dtadr = chan->dev_addr;
559 } else {
560 new->desc.dsadr = chan->dev_addr;
561 new->desc.dtadr = addr;
562 }
563
564 if (!first)
565 first = new;
566 else
567 prev->desc.ddadr = new->async_tx.phys;
568
569 new->async_tx.cookie = 0;
570 async_tx_ack(&new->async_tx);
571 prev = new;
572
573 /* Insert the link descriptor to the LD ring */
574 list_add_tail(&new->node, &first->tx_list);
575
576 /* update metadata */
577 addr += len;
578 avail -= len;
579 } while (avail);
580 }
581
582 first->async_tx.cookie = -EBUSY;
583 first->async_tx.flags = flags;
584
585 /* last desc and fire IRQ */
586 new->desc.ddadr = DDADR_STOP;
587 new->desc.dcmd |= DCMD_ENDIRQEN;
588
589 chan->dir = dir;
590 chan->cyclic_first = NULL;
591
592 return &first->async_tx;
593
594 fail:
595 if (first)
596 mmp_pdma_free_desc_list(chan, &first->tx_list);
597 return NULL;
598 }
599
600 static struct dma_async_tx_descriptor *
601 mmp_pdma_prep_dma_cyclic(struct dma_chan *dchan,
602 dma_addr_t buf_addr, size_t len, size_t period_len,
603 enum dma_transfer_direction direction,
604 unsigned long flags, void *context)
605 {
606 struct mmp_pdma_chan *chan;
607 struct mmp_pdma_desc_sw *first = NULL, *prev = NULL, *new;
608 dma_addr_t dma_src, dma_dst;
609
610 if (!dchan || !len || !period_len)
611 return NULL;
612
613 /* the buffer length must be a multiple of period_len */
614 if (len % period_len != 0)
615 return NULL;
616
617 if (period_len > PDMA_MAX_DESC_BYTES)
618 return NULL;
619
620 chan = to_mmp_pdma_chan(dchan);
621
622 switch (direction) {
623 case DMA_MEM_TO_DEV:
624 dma_src = buf_addr;
625 dma_dst = chan->dev_addr;
626 break;
627 case DMA_DEV_TO_MEM:
628 dma_dst = buf_addr;
629 dma_src = chan->dev_addr;
630 break;
631 default:
632 dev_err(chan->dev, "Unsupported direction for cyclic DMA\n");
633 return NULL;
634 }
635
636 chan->dir = direction;
637
638 do {
639 /* Allocate the link descriptor from DMA pool */
640 new = mmp_pdma_alloc_descriptor(chan);
641 if (!new) {
642 dev_err(chan->dev, "no memory for desc\n");
643 goto fail;
644 }
645
646 new->desc.dcmd = (chan->dcmd | DCMD_ENDIRQEN |
647 (DCMD_LENGTH & period_len));
648 new->desc.dsadr = dma_src;
649 new->desc.dtadr = dma_dst;
650
651 if (!first)
652 first = new;
653 else
654 prev->desc.ddadr = new->async_tx.phys;
655
656 new->async_tx.cookie = 0;
657 async_tx_ack(&new->async_tx);
658
659 prev = new;
660 len -= period_len;
661
662 if (chan->dir == DMA_MEM_TO_DEV)
663 dma_src += period_len;
664 else
665 dma_dst += period_len;
666
667 /* Insert the link descriptor to the LD ring */
668 list_add_tail(&new->node, &first->tx_list);
669 } while (len);
670
671 first->async_tx.flags = flags; /* client is in control of this ack */
672 first->async_tx.cookie = -EBUSY;
673
674 /* make the cyclic link */
675 new->desc.ddadr = first->async_tx.phys;
676 chan->cyclic_first = first;
677
678 return &first->async_tx;
679
680 fail:
681 if (first)
682 mmp_pdma_free_desc_list(chan, &first->tx_list);
683 return NULL;
684 }
685
686 static int mmp_pdma_control(struct dma_chan *dchan, enum dma_ctrl_cmd cmd,
687 unsigned long arg)
688 {
689 struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan);
690 struct dma_slave_config *cfg = (void *)arg;
691 unsigned long flags;
692 u32 maxburst = 0, addr = 0;
693 enum dma_slave_buswidth width = DMA_SLAVE_BUSWIDTH_UNDEFINED;
694
695 if (!dchan)
696 return -EINVAL;
697
698 switch (cmd) {
699 case DMA_TERMINATE_ALL:
700 disable_chan(chan->phy);
701 mmp_pdma_free_phy(chan);
702 spin_lock_irqsave(&chan->desc_lock, flags);
703 mmp_pdma_free_desc_list(chan, &chan->chain_pending);
704 mmp_pdma_free_desc_list(chan, &chan->chain_running);
705 spin_unlock_irqrestore(&chan->desc_lock, flags);
706 chan->idle = true;
707 break;
708 case DMA_SLAVE_CONFIG:
709 if (cfg->direction == DMA_DEV_TO_MEM) {
710 chan->dcmd = DCMD_INCTRGADDR | DCMD_FLOWSRC;
711 maxburst = cfg->src_maxburst;
712 width = cfg->src_addr_width;
713 addr = cfg->src_addr;
714 } else if (cfg->direction == DMA_MEM_TO_DEV) {
715 chan->dcmd = DCMD_INCSRCADDR | DCMD_FLOWTRG;
716 maxburst = cfg->dst_maxburst;
717 width = cfg->dst_addr_width;
718 addr = cfg->dst_addr;
719 }
720
721 if (width == DMA_SLAVE_BUSWIDTH_1_BYTE)
722 chan->dcmd |= DCMD_WIDTH1;
723 else if (width == DMA_SLAVE_BUSWIDTH_2_BYTES)
724 chan->dcmd |= DCMD_WIDTH2;
725 else if (width == DMA_SLAVE_BUSWIDTH_4_BYTES)
726 chan->dcmd |= DCMD_WIDTH4;
727
728 if (maxburst == 8)
729 chan->dcmd |= DCMD_BURST8;
730 else if (maxburst == 16)
731 chan->dcmd |= DCMD_BURST16;
732 else if (maxburst == 32)
733 chan->dcmd |= DCMD_BURST32;
734
735 chan->dir = cfg->direction;
736 chan->dev_addr = addr;
737 /* FIXME: drivers should be ported over to use the filter
738 * function. Once that's done, the following two lines can
739 * be removed.
740 */
741 if (cfg->slave_id)
742 chan->drcmr = cfg->slave_id;
743 break;
744 default:
745 return -ENOSYS;
746 }
747
748 return 0;
749 }
750
751 static enum dma_status mmp_pdma_tx_status(struct dma_chan *dchan,
752 dma_cookie_t cookie,
753 struct dma_tx_state *txstate)
754 {
755 return dma_cookie_status(dchan, cookie, txstate);
756 }
757
758 /**
759 * mmp_pdma_issue_pending - Issue the DMA start command
760 * pending list ==> running list
761 */
762 static void mmp_pdma_issue_pending(struct dma_chan *dchan)
763 {
764 struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan);
765 unsigned long flags;
766
767 spin_lock_irqsave(&chan->desc_lock, flags);
768 start_pending_queue(chan);
769 spin_unlock_irqrestore(&chan->desc_lock, flags);
770 }
771
772 /*
773 * dma_do_tasklet
774 * Do call back
775 * Start pending list
776 */
777 static void dma_do_tasklet(unsigned long data)
778 {
779 struct mmp_pdma_chan *chan = (struct mmp_pdma_chan *)data;
780 struct mmp_pdma_desc_sw *desc, *_desc;
781 LIST_HEAD(chain_cleanup);
782 unsigned long flags;
783
784 if (chan->cyclic_first) {
785 dma_async_tx_callback cb = NULL;
786 void *cb_data = NULL;
787
788 spin_lock_irqsave(&chan->desc_lock, flags);
789 desc = chan->cyclic_first;
790 cb = desc->async_tx.callback;
791 cb_data = desc->async_tx.callback_param;
792 spin_unlock_irqrestore(&chan->desc_lock, flags);
793
794 if (cb)
795 cb(cb_data);
796
797 return;
798 }
799
800 /* submit pending list; callback for each desc; free desc */
801 spin_lock_irqsave(&chan->desc_lock, flags);
802
803 list_for_each_entry_safe(desc, _desc, &chan->chain_running, node) {
804 /*
805 * move the descriptors to a temporary list so we can drop
806 * the lock during the entire cleanup operation
807 */
808 list_move(&desc->node, &chain_cleanup);
809
810 /*
811 * Look for the first list entry which has the ENDIRQEN flag
812 * set. That is the descriptor we got an interrupt for, so
813 * complete that transaction and its cookie.
814 */
815 if (desc->desc.dcmd & DCMD_ENDIRQEN) {
816 dma_cookie_t cookie = desc->async_tx.cookie;
817 dma_cookie_complete(&desc->async_tx);
818 dev_dbg(chan->dev, "completed_cookie=%d\n", cookie);
819 break;
820 }
821 }
822
823 /*
824 * The hardware is idle and ready for more when the
825 * chain_running list is empty.
826 */
827 chan->idle = list_empty(&chan->chain_running);
828
829 /* Start any pending transactions automatically */
830 start_pending_queue(chan);
831 spin_unlock_irqrestore(&chan->desc_lock, flags);
832
833 /* Run the callback for each descriptor, in order */
834 list_for_each_entry_safe(desc, _desc, &chain_cleanup, node) {
835 struct dma_async_tx_descriptor *txd = &desc->async_tx;
836
837 /* Remove from the list of transactions */
838 list_del(&desc->node);
839 /* Run the link descriptor callback function */
840 if (txd->callback)
841 txd->callback(txd->callback_param);
842
843 dma_pool_free(chan->desc_pool, desc, txd->phys);
844 }
845 }
846
847 static int mmp_pdma_remove(struct platform_device *op)
848 {
849 struct mmp_pdma_device *pdev = platform_get_drvdata(op);
850
851 dma_async_device_unregister(&pdev->device);
852 return 0;
853 }
854
855 static int mmp_pdma_chan_init(struct mmp_pdma_device *pdev, int idx, int irq)
856 {
857 struct mmp_pdma_phy *phy = &pdev->phy[idx];
858 struct mmp_pdma_chan *chan;
859 int ret;
860
861 chan = devm_kzalloc(pdev->dev, sizeof(struct mmp_pdma_chan),
862 GFP_KERNEL);
863 if (chan == NULL)
864 return -ENOMEM;
865
866 phy->idx = idx;
867 phy->base = pdev->base;
868
869 if (irq) {
870 ret = devm_request_irq(pdev->dev, irq, mmp_pdma_chan_handler, 0,
871 "pdma", phy);
872 if (ret) {
873 dev_err(pdev->dev, "channel request irq fail!\n");
874 return ret;
875 }
876 }
877
878 spin_lock_init(&chan->desc_lock);
879 chan->dev = pdev->dev;
880 chan->chan.device = &pdev->device;
881 tasklet_init(&chan->tasklet, dma_do_tasklet, (unsigned long)chan);
882 INIT_LIST_HEAD(&chan->chain_pending);
883 INIT_LIST_HEAD(&chan->chain_running);
884
885 /* register virt channel to dma engine */
886 list_add_tail(&chan->chan.device_node, &pdev->device.channels);
887
888 return 0;
889 }
890
891 static struct of_device_id mmp_pdma_dt_ids[] = {
892 { .compatible = "marvell,pdma-1.0", },
893 {}
894 };
895 MODULE_DEVICE_TABLE(of, mmp_pdma_dt_ids);
896
897 static struct dma_chan *mmp_pdma_dma_xlate(struct of_phandle_args *dma_spec,
898 struct of_dma *ofdma)
899 {
900 struct mmp_pdma_device *d = ofdma->of_dma_data;
901 struct dma_chan *chan;
902
903 chan = dma_get_any_slave_channel(&d->device);
904 if (!chan)
905 return NULL;
906
907 to_mmp_pdma_chan(chan)->drcmr = dma_spec->args[0];
908
909 return chan;
910 }
911
912 static int mmp_pdma_probe(struct platform_device *op)
913 {
914 struct mmp_pdma_device *pdev;
915 const struct of_device_id *of_id;
916 struct mmp_dma_platdata *pdata = dev_get_platdata(&op->dev);
917 struct resource *iores;
918 int i, ret, irq = 0;
919 int dma_channels = 0, irq_num = 0;
920
921 pdev = devm_kzalloc(&op->dev, sizeof(*pdev), GFP_KERNEL);
922 if (!pdev)
923 return -ENOMEM;
924
925 pdev->dev = &op->dev;
926
927 spin_lock_init(&pdev->phy_lock);
928
929 iores = platform_get_resource(op, IORESOURCE_MEM, 0);
930 pdev->base = devm_ioremap_resource(pdev->dev, iores);
931 if (IS_ERR(pdev->base))
932 return PTR_ERR(pdev->base);
933
934 of_id = of_match_device(mmp_pdma_dt_ids, pdev->dev);
935 if (of_id)
936 of_property_read_u32(pdev->dev->of_node, "#dma-channels",
937 &dma_channels);
938 else if (pdata && pdata->dma_channels)
939 dma_channels = pdata->dma_channels;
940 else
941 dma_channels = 32; /* default 32 channel */
942 pdev->dma_channels = dma_channels;
943
944 for (i = 0; i < dma_channels; i++) {
945 if (platform_get_irq(op, i) > 0)
946 irq_num++;
947 }
948
949 pdev->phy = devm_kcalloc(pdev->dev,
950 dma_channels, sizeof(struct mmp_pdma_chan),
951 GFP_KERNEL);
952 if (pdev->phy == NULL)
953 return -ENOMEM;
954
955 INIT_LIST_HEAD(&pdev->device.channels);
956
957 if (irq_num != dma_channels) {
958 /* all chan share one irq, demux inside */
959 irq = platform_get_irq(op, 0);
960 ret = devm_request_irq(pdev->dev, irq, mmp_pdma_int_handler, 0,
961 "pdma", pdev);
962 if (ret)
963 return ret;
964 }
965
966 for (i = 0; i < dma_channels; i++) {
967 irq = (irq_num != dma_channels) ? 0 : platform_get_irq(op, i);
968 ret = mmp_pdma_chan_init(pdev, i, irq);
969 if (ret)
970 return ret;
971 }
972
973 dma_cap_set(DMA_SLAVE, pdev->device.cap_mask);
974 dma_cap_set(DMA_MEMCPY, pdev->device.cap_mask);
975 dma_cap_set(DMA_CYCLIC, pdev->device.cap_mask);
976 dma_cap_set(DMA_PRIVATE, pdev->device.cap_mask);
977 pdev->device.dev = &op->dev;
978 pdev->device.device_alloc_chan_resources = mmp_pdma_alloc_chan_resources;
979 pdev->device.device_free_chan_resources = mmp_pdma_free_chan_resources;
980 pdev->device.device_tx_status = mmp_pdma_tx_status;
981 pdev->device.device_prep_dma_memcpy = mmp_pdma_prep_memcpy;
982 pdev->device.device_prep_slave_sg = mmp_pdma_prep_slave_sg;
983 pdev->device.device_prep_dma_cyclic = mmp_pdma_prep_dma_cyclic;
984 pdev->device.device_issue_pending = mmp_pdma_issue_pending;
985 pdev->device.device_control = mmp_pdma_control;
986 pdev->device.copy_align = PDMA_ALIGNMENT;
987
988 if (pdev->dev->coherent_dma_mask)
989 dma_set_mask(pdev->dev, pdev->dev->coherent_dma_mask);
990 else
991 dma_set_mask(pdev->dev, DMA_BIT_MASK(64));
992
993 ret = dma_async_device_register(&pdev->device);
994 if (ret) {
995 dev_err(pdev->device.dev, "unable to register\n");
996 return ret;
997 }
998
999 if (op->dev.of_node) {
1000 /* Device-tree DMA controller registration */
1001 ret = of_dma_controller_register(op->dev.of_node,
1002 mmp_pdma_dma_xlate, pdev);
1003 if (ret < 0) {
1004 dev_err(&op->dev, "of_dma_controller_register failed\n");
1005 return ret;
1006 }
1007 }
1008
1009 platform_set_drvdata(op, pdev);
1010 dev_info(pdev->device.dev, "initialized %d channels\n", dma_channels);
1011 return 0;
1012 }
1013
1014 static const struct platform_device_id mmp_pdma_id_table[] = {
1015 { "mmp-pdma", },
1016 { },
1017 };
1018
1019 static struct platform_driver mmp_pdma_driver = {
1020 .driver = {
1021 .name = "mmp-pdma",
1022 .owner = THIS_MODULE,
1023 .of_match_table = mmp_pdma_dt_ids,
1024 },
1025 .id_table = mmp_pdma_id_table,
1026 .probe = mmp_pdma_probe,
1027 .remove = mmp_pdma_remove,
1028 };
1029
1030 bool mmp_pdma_filter_fn(struct dma_chan *chan, void *param)
1031 {
1032 struct mmp_pdma_chan *c = to_mmp_pdma_chan(chan);
1033
1034 if (chan->device->dev->driver != &mmp_pdma_driver.driver)
1035 return false;
1036
1037 c->drcmr = *(unsigned int *)param;
1038
1039 return true;
1040 }
1041 EXPORT_SYMBOL_GPL(mmp_pdma_filter_fn);
1042
1043 module_platform_driver(mmp_pdma_driver);
1044
1045 MODULE_DESCRIPTION("MARVELL MMP Peripheral DMA Driver");
1046 MODULE_AUTHOR("Marvell International Ltd.");
1047 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support