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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
78struct 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
85struct 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
92struct mmp_pdma_phy;
93
94struct 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
120struct mmp_pdma_phy {
121 int idx;
122 void __iomem *base;
123 struct mmp_pdma_chan *vchan;
124};
125
126struct 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
144static 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
151static 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
172static 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
183static 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
201static 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
212static 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 */
236static 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
265out_unlock:
266 spin_unlock_irqrestore(&pdev->phy_lock, flags);
267 return found;
268}
269
270static 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 */
293static 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 */
337static 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
359static struct mmp_pdma_desc_sw *
360mmp_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
389static 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
412static 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
423static 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
441static struct dma_async_tx_descriptor *
442mmp_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
516fail:
517 if (first)
518 mmp_pdma_free_desc_list(chan, &first->tx_list);
519 return NULL;
520}
521
522static struct dma_async_tx_descriptor *
523mmp_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
594fail:
595 if (first)
596 mmp_pdma_free_desc_list(chan, &first->tx_list);
597 return NULL;
598}
599
600static struct dma_async_tx_descriptor *
601mmp_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
680fail:
681 if (first)
682 mmp_pdma_free_desc_list(chan, &first->tx_list);
683 return NULL;
684}
685
686static 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
751static 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 */
762static 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 */
777static 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
847static 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
855static 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,
871 IRQF_SHARED, "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
891static struct of_device_id mmp_pdma_dt_ids[] = {
892 { .compatible = "marvell,pdma-1.0", },
893 {}
894};
895MODULE_DEVICE_TABLE(of, mmp_pdma_dt_ids);
896
897static 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
912static 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,
961 IRQF_SHARED, "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
1014static const struct platform_device_id mmp_pdma_id_table[] = {
1015 { "mmp-pdma", },
1016 { },
1017};
1018
1019static 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
1030bool 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}
1041EXPORT_SYMBOL_GPL(mmp_pdma_filter_fn);
1042
1043module_platform_driver(mmp_pdma_driver);
1044
1045MODULE_DESCRIPTION("MARVELL MMP Peripheral DMA Driver");
1046MODULE_AUTHOR("Marvell International Ltd.");
1047MODULE_LICENSE("GPL v2");
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(n) (0x0204 + ((n) << 4))
33#define DTADR(n) (0x0208 + ((n) << 4))
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_MAX_DESC_BYTES DCMD_LENGTH
76
77struct mmp_pdma_desc_hw {
78 u32 ddadr; /* Points to the next descriptor + flags */
79 u32 dsadr; /* DSADR value for the current transfer */
80 u32 dtadr; /* DTADR value for the current transfer */
81 u32 dcmd; /* DCMD value for the current transfer */
82} __aligned(32);
83
84struct mmp_pdma_desc_sw {
85 struct mmp_pdma_desc_hw desc;
86 struct list_head node;
87 struct list_head tx_list;
88 struct dma_async_tx_descriptor async_tx;
89};
90
91struct mmp_pdma_phy;
92
93struct mmp_pdma_chan {
94 struct device *dev;
95 struct dma_chan chan;
96 struct dma_async_tx_descriptor desc;
97 struct mmp_pdma_phy *phy;
98 enum dma_transfer_direction dir;
99
100 struct mmp_pdma_desc_sw *cyclic_first; /* first desc_sw if channel
101 * is in cyclic mode */
102
103 /* channel's basic info */
104 struct tasklet_struct tasklet;
105 u32 dcmd;
106 u32 drcmr;
107 u32 dev_addr;
108
109 /* list for desc */
110 spinlock_t desc_lock; /* Descriptor list lock */
111 struct list_head chain_pending; /* Link descriptors queue for pending */
112 struct list_head chain_running; /* Link descriptors queue for running */
113 bool idle; /* channel statue machine */
114 bool byte_align;
115
116 struct dma_pool *desc_pool; /* Descriptors pool */
117};
118
119struct mmp_pdma_phy {
120 int idx;
121 void __iomem *base;
122 struct mmp_pdma_chan *vchan;
123};
124
125struct mmp_pdma_device {
126 int dma_channels;
127 void __iomem *base;
128 struct device *dev;
129 struct dma_device device;
130 struct mmp_pdma_phy *phy;
131 spinlock_t phy_lock; /* protect alloc/free phy channels */
132};
133
134#define tx_to_mmp_pdma_desc(tx) \
135 container_of(tx, struct mmp_pdma_desc_sw, async_tx)
136#define to_mmp_pdma_desc(lh) \
137 container_of(lh, struct mmp_pdma_desc_sw, node)
138#define to_mmp_pdma_chan(dchan) \
139 container_of(dchan, struct mmp_pdma_chan, chan)
140#define to_mmp_pdma_dev(dmadev) \
141 container_of(dmadev, struct mmp_pdma_device, device)
142
143static void set_desc(struct mmp_pdma_phy *phy, dma_addr_t addr)
144{
145 u32 reg = (phy->idx << 4) + DDADR;
146
147 writel(addr, phy->base + reg);
148}
149
150static void enable_chan(struct mmp_pdma_phy *phy)
151{
152 u32 reg, dalgn;
153
154 if (!phy->vchan)
155 return;
156
157 reg = DRCMR(phy->vchan->drcmr);
158 writel(DRCMR_MAPVLD | phy->idx, phy->base + reg);
159
160 dalgn = readl(phy->base + DALGN);
161 if (phy->vchan->byte_align)
162 dalgn |= 1 << phy->idx;
163 else
164 dalgn &= ~(1 << phy->idx);
165 writel(dalgn, phy->base + DALGN);
166
167 reg = (phy->idx << 2) + DCSR;
168 writel(readl(phy->base + reg) | DCSR_RUN, phy->base + reg);
169}
170
171static void disable_chan(struct mmp_pdma_phy *phy)
172{
173 u32 reg;
174
175 if (!phy)
176 return;
177
178 reg = (phy->idx << 2) + DCSR;
179 writel(readl(phy->base + reg) & ~DCSR_RUN, phy->base + reg);
180}
181
182static int clear_chan_irq(struct mmp_pdma_phy *phy)
183{
184 u32 dcsr;
185 u32 dint = readl(phy->base + DINT);
186 u32 reg = (phy->idx << 2) + DCSR;
187
188 if (!(dint & BIT(phy->idx)))
189 return -EAGAIN;
190
191 /* clear irq */
192 dcsr = readl(phy->base + reg);
193 writel(dcsr, phy->base + reg);
194 if ((dcsr & DCSR_BUSERR) && (phy->vchan))
195 dev_warn(phy->vchan->dev, "DCSR_BUSERR\n");
196
197 return 0;
198}
199
200static irqreturn_t mmp_pdma_chan_handler(int irq, void *dev_id)
201{
202 struct mmp_pdma_phy *phy = dev_id;
203
204 if (clear_chan_irq(phy) != 0)
205 return IRQ_NONE;
206
207 tasklet_schedule(&phy->vchan->tasklet);
208 return IRQ_HANDLED;
209}
210
211static irqreturn_t mmp_pdma_int_handler(int irq, void *dev_id)
212{
213 struct mmp_pdma_device *pdev = dev_id;
214 struct mmp_pdma_phy *phy;
215 u32 dint = readl(pdev->base + DINT);
216 int i, ret;
217 int irq_num = 0;
218
219 while (dint) {
220 i = __ffs(dint);
221 /* only handle interrupts belonging to pdma driver*/
222 if (i >= pdev->dma_channels)
223 break;
224 dint &= (dint - 1);
225 phy = &pdev->phy[i];
226 ret = mmp_pdma_chan_handler(irq, phy);
227 if (ret == IRQ_HANDLED)
228 irq_num++;
229 }
230
231 if (irq_num)
232 return IRQ_HANDLED;
233
234 return IRQ_NONE;
235}
236
237/* lookup free phy channel as descending priority */
238static struct mmp_pdma_phy *lookup_phy(struct mmp_pdma_chan *pchan)
239{
240 int prio, i;
241 struct mmp_pdma_device *pdev = to_mmp_pdma_dev(pchan->chan.device);
242 struct mmp_pdma_phy *phy, *found = NULL;
243 unsigned long flags;
244
245 /*
246 * dma channel priorities
247 * ch 0 - 3, 16 - 19 <--> (0)
248 * ch 4 - 7, 20 - 23 <--> (1)
249 * ch 8 - 11, 24 - 27 <--> (2)
250 * ch 12 - 15, 28 - 31 <--> (3)
251 */
252
253 spin_lock_irqsave(&pdev->phy_lock, flags);
254 for (prio = 0; prio <= ((pdev->dma_channels - 1) & 0xf) >> 2; prio++) {
255 for (i = 0; i < pdev->dma_channels; i++) {
256 if (prio != (i & 0xf) >> 2)
257 continue;
258 phy = &pdev->phy[i];
259 if (!phy->vchan) {
260 phy->vchan = pchan;
261 found = phy;
262 goto out_unlock;
263 }
264 }
265 }
266
267out_unlock:
268 spin_unlock_irqrestore(&pdev->phy_lock, flags);
269 return found;
270}
271
272static void mmp_pdma_free_phy(struct mmp_pdma_chan *pchan)
273{
274 struct mmp_pdma_device *pdev = to_mmp_pdma_dev(pchan->chan.device);
275 unsigned long flags;
276 u32 reg;
277
278 if (!pchan->phy)
279 return;
280
281 /* clear the channel mapping in DRCMR */
282 reg = DRCMR(pchan->drcmr);
283 writel(0, pchan->phy->base + reg);
284
285 spin_lock_irqsave(&pdev->phy_lock, flags);
286 pchan->phy->vchan = NULL;
287 pchan->phy = NULL;
288 spin_unlock_irqrestore(&pdev->phy_lock, flags);
289}
290
291/**
292 * start_pending_queue - transfer any pending transactions
293 * pending list ==> running list
294 */
295static void start_pending_queue(struct mmp_pdma_chan *chan)
296{
297 struct mmp_pdma_desc_sw *desc;
298
299 /* still in running, irq will start the pending list */
300 if (!chan->idle) {
301 dev_dbg(chan->dev, "DMA controller still busy\n");
302 return;
303 }
304
305 if (list_empty(&chan->chain_pending)) {
306 /* chance to re-fetch phy channel with higher prio */
307 mmp_pdma_free_phy(chan);
308 dev_dbg(chan->dev, "no pending list\n");
309 return;
310 }
311
312 if (!chan->phy) {
313 chan->phy = lookup_phy(chan);
314 if (!chan->phy) {
315 dev_dbg(chan->dev, "no free dma channel\n");
316 return;
317 }
318 }
319
320 /*
321 * pending -> running
322 * reintilize pending list
323 */
324 desc = list_first_entry(&chan->chain_pending,
325 struct mmp_pdma_desc_sw, node);
326 list_splice_tail_init(&chan->chain_pending, &chan->chain_running);
327
328 /*
329 * Program the descriptor's address into the DMA controller,
330 * then start the DMA transaction
331 */
332 set_desc(chan->phy, desc->async_tx.phys);
333 enable_chan(chan->phy);
334 chan->idle = false;
335}
336
337
338/* desc->tx_list ==> pending list */
339static dma_cookie_t mmp_pdma_tx_submit(struct dma_async_tx_descriptor *tx)
340{
341 struct mmp_pdma_chan *chan = to_mmp_pdma_chan(tx->chan);
342 struct mmp_pdma_desc_sw *desc = tx_to_mmp_pdma_desc(tx);
343 struct mmp_pdma_desc_sw *child;
344 unsigned long flags;
345 dma_cookie_t cookie = -EBUSY;
346
347 spin_lock_irqsave(&chan->desc_lock, flags);
348
349 list_for_each_entry(child, &desc->tx_list, node) {
350 cookie = dma_cookie_assign(&child->async_tx);
351 }
352
353 /* softly link to pending list - desc->tx_list ==> pending list */
354 list_splice_tail_init(&desc->tx_list, &chan->chain_pending);
355
356 spin_unlock_irqrestore(&chan->desc_lock, flags);
357
358 return cookie;
359}
360
361static struct mmp_pdma_desc_sw *
362mmp_pdma_alloc_descriptor(struct mmp_pdma_chan *chan)
363{
364 struct mmp_pdma_desc_sw *desc;
365 dma_addr_t pdesc;
366
367 desc = dma_pool_zalloc(chan->desc_pool, GFP_ATOMIC, &pdesc);
368 if (!desc) {
369 dev_err(chan->dev, "out of memory for link descriptor\n");
370 return NULL;
371 }
372
373 INIT_LIST_HEAD(&desc->tx_list);
374 dma_async_tx_descriptor_init(&desc->async_tx, &chan->chan);
375 /* each desc has submit */
376 desc->async_tx.tx_submit = mmp_pdma_tx_submit;
377 desc->async_tx.phys = pdesc;
378
379 return desc;
380}
381
382/**
383 * mmp_pdma_alloc_chan_resources - Allocate resources for DMA channel.
384 *
385 * This function will create a dma pool for descriptor allocation.
386 * Request irq only when channel is requested
387 * Return - The number of allocated descriptors.
388 */
389
390static int mmp_pdma_alloc_chan_resources(struct dma_chan *dchan)
391{
392 struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan);
393
394 if (chan->desc_pool)
395 return 1;
396
397 chan->desc_pool = dma_pool_create(dev_name(&dchan->dev->device),
398 chan->dev,
399 sizeof(struct mmp_pdma_desc_sw),
400 __alignof__(struct mmp_pdma_desc_sw),
401 0);
402 if (!chan->desc_pool) {
403 dev_err(chan->dev, "unable to allocate descriptor pool\n");
404 return -ENOMEM;
405 }
406
407 mmp_pdma_free_phy(chan);
408 chan->idle = true;
409 chan->dev_addr = 0;
410 return 1;
411}
412
413static void mmp_pdma_free_desc_list(struct mmp_pdma_chan *chan,
414 struct list_head *list)
415{
416 struct mmp_pdma_desc_sw *desc, *_desc;
417
418 list_for_each_entry_safe(desc, _desc, list, node) {
419 list_del(&desc->node);
420 dma_pool_free(chan->desc_pool, desc, desc->async_tx.phys);
421 }
422}
423
424static void mmp_pdma_free_chan_resources(struct dma_chan *dchan)
425{
426 struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan);
427 unsigned long flags;
428
429 spin_lock_irqsave(&chan->desc_lock, flags);
430 mmp_pdma_free_desc_list(chan, &chan->chain_pending);
431 mmp_pdma_free_desc_list(chan, &chan->chain_running);
432 spin_unlock_irqrestore(&chan->desc_lock, flags);
433
434 dma_pool_destroy(chan->desc_pool);
435 chan->desc_pool = NULL;
436 chan->idle = true;
437 chan->dev_addr = 0;
438 mmp_pdma_free_phy(chan);
439 return;
440}
441
442static struct dma_async_tx_descriptor *
443mmp_pdma_prep_memcpy(struct dma_chan *dchan,
444 dma_addr_t dma_dst, dma_addr_t dma_src,
445 size_t len, unsigned long flags)
446{
447 struct mmp_pdma_chan *chan;
448 struct mmp_pdma_desc_sw *first = NULL, *prev = NULL, *new;
449 size_t copy = 0;
450
451 if (!dchan)
452 return NULL;
453
454 if (!len)
455 return NULL;
456
457 chan = to_mmp_pdma_chan(dchan);
458 chan->byte_align = false;
459
460 if (!chan->dir) {
461 chan->dir = DMA_MEM_TO_MEM;
462 chan->dcmd = DCMD_INCTRGADDR | DCMD_INCSRCADDR;
463 chan->dcmd |= DCMD_BURST32;
464 }
465
466 do {
467 /* Allocate the link descriptor from DMA pool */
468 new = mmp_pdma_alloc_descriptor(chan);
469 if (!new) {
470 dev_err(chan->dev, "no memory for desc\n");
471 goto fail;
472 }
473
474 copy = min_t(size_t, len, PDMA_MAX_DESC_BYTES);
475 if (dma_src & 0x7 || dma_dst & 0x7)
476 chan->byte_align = true;
477
478 new->desc.dcmd = chan->dcmd | (DCMD_LENGTH & copy);
479 new->desc.dsadr = dma_src;
480 new->desc.dtadr = dma_dst;
481
482 if (!first)
483 first = new;
484 else
485 prev->desc.ddadr = new->async_tx.phys;
486
487 new->async_tx.cookie = 0;
488 async_tx_ack(&new->async_tx);
489
490 prev = new;
491 len -= copy;
492
493 if (chan->dir == DMA_MEM_TO_DEV) {
494 dma_src += copy;
495 } else if (chan->dir == DMA_DEV_TO_MEM) {
496 dma_dst += copy;
497 } else if (chan->dir == DMA_MEM_TO_MEM) {
498 dma_src += copy;
499 dma_dst += copy;
500 }
501
502 /* Insert the link descriptor to the LD ring */
503 list_add_tail(&new->node, &first->tx_list);
504 } while (len);
505
506 first->async_tx.flags = flags; /* client is in control of this ack */
507 first->async_tx.cookie = -EBUSY;
508
509 /* last desc and fire IRQ */
510 new->desc.ddadr = DDADR_STOP;
511 new->desc.dcmd |= DCMD_ENDIRQEN;
512
513 chan->cyclic_first = NULL;
514
515 return &first->async_tx;
516
517fail:
518 if (first)
519 mmp_pdma_free_desc_list(chan, &first->tx_list);
520 return NULL;
521}
522
523static struct dma_async_tx_descriptor *
524mmp_pdma_prep_slave_sg(struct dma_chan *dchan, struct scatterlist *sgl,
525 unsigned int sg_len, enum dma_transfer_direction dir,
526 unsigned long flags, void *context)
527{
528 struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan);
529 struct mmp_pdma_desc_sw *first = NULL, *prev = NULL, *new = NULL;
530 size_t len, avail;
531 struct scatterlist *sg;
532 dma_addr_t addr;
533 int i;
534
535 if ((sgl == NULL) || (sg_len == 0))
536 return NULL;
537
538 chan->byte_align = false;
539
540 for_each_sg(sgl, sg, sg_len, i) {
541 addr = sg_dma_address(sg);
542 avail = sg_dma_len(sgl);
543
544 do {
545 len = min_t(size_t, avail, PDMA_MAX_DESC_BYTES);
546 if (addr & 0x7)
547 chan->byte_align = true;
548
549 /* allocate and populate the descriptor */
550 new = mmp_pdma_alloc_descriptor(chan);
551 if (!new) {
552 dev_err(chan->dev, "no memory for desc\n");
553 goto fail;
554 }
555
556 new->desc.dcmd = chan->dcmd | (DCMD_LENGTH & len);
557 if (dir == DMA_MEM_TO_DEV) {
558 new->desc.dsadr = addr;
559 new->desc.dtadr = chan->dev_addr;
560 } else {
561 new->desc.dsadr = chan->dev_addr;
562 new->desc.dtadr = addr;
563 }
564
565 if (!first)
566 first = new;
567 else
568 prev->desc.ddadr = new->async_tx.phys;
569
570 new->async_tx.cookie = 0;
571 async_tx_ack(&new->async_tx);
572 prev = new;
573
574 /* Insert the link descriptor to the LD ring */
575 list_add_tail(&new->node, &first->tx_list);
576
577 /* update metadata */
578 addr += len;
579 avail -= len;
580 } while (avail);
581 }
582
583 first->async_tx.cookie = -EBUSY;
584 first->async_tx.flags = flags;
585
586 /* last desc and fire IRQ */
587 new->desc.ddadr = DDADR_STOP;
588 new->desc.dcmd |= DCMD_ENDIRQEN;
589
590 chan->dir = dir;
591 chan->cyclic_first = NULL;
592
593 return &first->async_tx;
594
595fail:
596 if (first)
597 mmp_pdma_free_desc_list(chan, &first->tx_list);
598 return NULL;
599}
600
601static struct dma_async_tx_descriptor *
602mmp_pdma_prep_dma_cyclic(struct dma_chan *dchan,
603 dma_addr_t buf_addr, size_t len, size_t period_len,
604 enum dma_transfer_direction direction,
605 unsigned long flags)
606{
607 struct mmp_pdma_chan *chan;
608 struct mmp_pdma_desc_sw *first = NULL, *prev = NULL, *new;
609 dma_addr_t dma_src, dma_dst;
610
611 if (!dchan || !len || !period_len)
612 return NULL;
613
614 /* the buffer length must be a multiple of period_len */
615 if (len % period_len != 0)
616 return NULL;
617
618 if (period_len > PDMA_MAX_DESC_BYTES)
619 return NULL;
620
621 chan = to_mmp_pdma_chan(dchan);
622
623 switch (direction) {
624 case DMA_MEM_TO_DEV:
625 dma_src = buf_addr;
626 dma_dst = chan->dev_addr;
627 break;
628 case DMA_DEV_TO_MEM:
629 dma_dst = buf_addr;
630 dma_src = chan->dev_addr;
631 break;
632 default:
633 dev_err(chan->dev, "Unsupported direction for cyclic DMA\n");
634 return NULL;
635 }
636
637 chan->dir = direction;
638
639 do {
640 /* Allocate the link descriptor from DMA pool */
641 new = mmp_pdma_alloc_descriptor(chan);
642 if (!new) {
643 dev_err(chan->dev, "no memory for desc\n");
644 goto fail;
645 }
646
647 new->desc.dcmd = (chan->dcmd | DCMD_ENDIRQEN |
648 (DCMD_LENGTH & period_len));
649 new->desc.dsadr = dma_src;
650 new->desc.dtadr = dma_dst;
651
652 if (!first)
653 first = new;
654 else
655 prev->desc.ddadr = new->async_tx.phys;
656
657 new->async_tx.cookie = 0;
658 async_tx_ack(&new->async_tx);
659
660 prev = new;
661 len -= period_len;
662
663 if (chan->dir == DMA_MEM_TO_DEV)
664 dma_src += period_len;
665 else
666 dma_dst += period_len;
667
668 /* Insert the link descriptor to the LD ring */
669 list_add_tail(&new->node, &first->tx_list);
670 } while (len);
671
672 first->async_tx.flags = flags; /* client is in control of this ack */
673 first->async_tx.cookie = -EBUSY;
674
675 /* make the cyclic link */
676 new->desc.ddadr = first->async_tx.phys;
677 chan->cyclic_first = first;
678
679 return &first->async_tx;
680
681fail:
682 if (first)
683 mmp_pdma_free_desc_list(chan, &first->tx_list);
684 return NULL;
685}
686
687static int mmp_pdma_config(struct dma_chan *dchan,
688 struct dma_slave_config *cfg)
689{
690 struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan);
691 u32 maxburst = 0, addr = 0;
692 enum dma_slave_buswidth width = DMA_SLAVE_BUSWIDTH_UNDEFINED;
693
694 if (!dchan)
695 return -EINVAL;
696
697 if (cfg->direction == DMA_DEV_TO_MEM) {
698 chan->dcmd = DCMD_INCTRGADDR | DCMD_FLOWSRC;
699 maxburst = cfg->src_maxburst;
700 width = cfg->src_addr_width;
701 addr = cfg->src_addr;
702 } else if (cfg->direction == DMA_MEM_TO_DEV) {
703 chan->dcmd = DCMD_INCSRCADDR | DCMD_FLOWTRG;
704 maxburst = cfg->dst_maxburst;
705 width = cfg->dst_addr_width;
706 addr = cfg->dst_addr;
707 }
708
709 if (width == DMA_SLAVE_BUSWIDTH_1_BYTE)
710 chan->dcmd |= DCMD_WIDTH1;
711 else if (width == DMA_SLAVE_BUSWIDTH_2_BYTES)
712 chan->dcmd |= DCMD_WIDTH2;
713 else if (width == DMA_SLAVE_BUSWIDTH_4_BYTES)
714 chan->dcmd |= DCMD_WIDTH4;
715
716 if (maxburst == 8)
717 chan->dcmd |= DCMD_BURST8;
718 else if (maxburst == 16)
719 chan->dcmd |= DCMD_BURST16;
720 else if (maxburst == 32)
721 chan->dcmd |= DCMD_BURST32;
722
723 chan->dir = cfg->direction;
724 chan->dev_addr = addr;
725 /* FIXME: drivers should be ported over to use the filter
726 * function. Once that's done, the following two lines can
727 * be removed.
728 */
729 if (cfg->slave_id)
730 chan->drcmr = cfg->slave_id;
731
732 return 0;
733}
734
735static int mmp_pdma_terminate_all(struct dma_chan *dchan)
736{
737 struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan);
738 unsigned long flags;
739
740 if (!dchan)
741 return -EINVAL;
742
743 disable_chan(chan->phy);
744 mmp_pdma_free_phy(chan);
745 spin_lock_irqsave(&chan->desc_lock, flags);
746 mmp_pdma_free_desc_list(chan, &chan->chain_pending);
747 mmp_pdma_free_desc_list(chan, &chan->chain_running);
748 spin_unlock_irqrestore(&chan->desc_lock, flags);
749 chan->idle = true;
750
751 return 0;
752}
753
754static unsigned int mmp_pdma_residue(struct mmp_pdma_chan *chan,
755 dma_cookie_t cookie)
756{
757 struct mmp_pdma_desc_sw *sw;
758 u32 curr, residue = 0;
759 bool passed = false;
760 bool cyclic = chan->cyclic_first != NULL;
761
762 /*
763 * If the channel does not have a phy pointer anymore, it has already
764 * been completed. Therefore, its residue is 0.
765 */
766 if (!chan->phy)
767 return 0;
768
769 if (chan->dir == DMA_DEV_TO_MEM)
770 curr = readl(chan->phy->base + DTADR(chan->phy->idx));
771 else
772 curr = readl(chan->phy->base + DSADR(chan->phy->idx));
773
774 list_for_each_entry(sw, &chan->chain_running, node) {
775 u32 start, end, len;
776
777 if (chan->dir == DMA_DEV_TO_MEM)
778 start = sw->desc.dtadr;
779 else
780 start = sw->desc.dsadr;
781
782 len = sw->desc.dcmd & DCMD_LENGTH;
783 end = start + len;
784
785 /*
786 * 'passed' will be latched once we found the descriptor which
787 * lies inside the boundaries of the curr pointer. All
788 * descriptors that occur in the list _after_ we found that
789 * partially handled descriptor are still to be processed and
790 * are hence added to the residual bytes counter.
791 */
792
793 if (passed) {
794 residue += len;
795 } else if (curr >= start && curr <= end) {
796 residue += end - curr;
797 passed = true;
798 }
799
800 /*
801 * Descriptors that have the ENDIRQEN bit set mark the end of a
802 * transaction chain, and the cookie assigned with it has been
803 * returned previously from mmp_pdma_tx_submit().
804 *
805 * In case we have multiple transactions in the running chain,
806 * and the cookie does not match the one the user asked us
807 * about, reset the state variables and start over.
808 *
809 * This logic does not apply to cyclic transactions, where all
810 * descriptors have the ENDIRQEN bit set, and for which we
811 * can't have multiple transactions on one channel anyway.
812 */
813 if (cyclic || !(sw->desc.dcmd & DCMD_ENDIRQEN))
814 continue;
815
816 if (sw->async_tx.cookie == cookie) {
817 return residue;
818 } else {
819 residue = 0;
820 passed = false;
821 }
822 }
823
824 /* We should only get here in case of cyclic transactions */
825 return residue;
826}
827
828static enum dma_status mmp_pdma_tx_status(struct dma_chan *dchan,
829 dma_cookie_t cookie,
830 struct dma_tx_state *txstate)
831{
832 struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan);
833 enum dma_status ret;
834
835 ret = dma_cookie_status(dchan, cookie, txstate);
836 if (likely(ret != DMA_ERROR))
837 dma_set_residue(txstate, mmp_pdma_residue(chan, cookie));
838
839 return ret;
840}
841
842/**
843 * mmp_pdma_issue_pending - Issue the DMA start command
844 * pending list ==> running list
845 */
846static void mmp_pdma_issue_pending(struct dma_chan *dchan)
847{
848 struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan);
849 unsigned long flags;
850
851 spin_lock_irqsave(&chan->desc_lock, flags);
852 start_pending_queue(chan);
853 spin_unlock_irqrestore(&chan->desc_lock, flags);
854}
855
856/*
857 * dma_do_tasklet
858 * Do call back
859 * Start pending list
860 */
861static void dma_do_tasklet(unsigned long data)
862{
863 struct mmp_pdma_chan *chan = (struct mmp_pdma_chan *)data;
864 struct mmp_pdma_desc_sw *desc, *_desc;
865 LIST_HEAD(chain_cleanup);
866 unsigned long flags;
867 struct dmaengine_desc_callback cb;
868
869 if (chan->cyclic_first) {
870 spin_lock_irqsave(&chan->desc_lock, flags);
871 desc = chan->cyclic_first;
872 dmaengine_desc_get_callback(&desc->async_tx, &cb);
873 spin_unlock_irqrestore(&chan->desc_lock, flags);
874
875 dmaengine_desc_callback_invoke(&cb, NULL);
876
877 return;
878 }
879
880 /* submit pending list; callback for each desc; free desc */
881 spin_lock_irqsave(&chan->desc_lock, flags);
882
883 list_for_each_entry_safe(desc, _desc, &chan->chain_running, node) {
884 /*
885 * move the descriptors to a temporary list so we can drop
886 * the lock during the entire cleanup operation
887 */
888 list_move(&desc->node, &chain_cleanup);
889
890 /*
891 * Look for the first list entry which has the ENDIRQEN flag
892 * set. That is the descriptor we got an interrupt for, so
893 * complete that transaction and its cookie.
894 */
895 if (desc->desc.dcmd & DCMD_ENDIRQEN) {
896 dma_cookie_t cookie = desc->async_tx.cookie;
897 dma_cookie_complete(&desc->async_tx);
898 dev_dbg(chan->dev, "completed_cookie=%d\n", cookie);
899 break;
900 }
901 }
902
903 /*
904 * The hardware is idle and ready for more when the
905 * chain_running list is empty.
906 */
907 chan->idle = list_empty(&chan->chain_running);
908
909 /* Start any pending transactions automatically */
910 start_pending_queue(chan);
911 spin_unlock_irqrestore(&chan->desc_lock, flags);
912
913 /* Run the callback for each descriptor, in order */
914 list_for_each_entry_safe(desc, _desc, &chain_cleanup, node) {
915 struct dma_async_tx_descriptor *txd = &desc->async_tx;
916
917 /* Remove from the list of transactions */
918 list_del(&desc->node);
919 /* Run the link descriptor callback function */
920 dmaengine_desc_get_callback(txd, &cb);
921 dmaengine_desc_callback_invoke(&cb, NULL);
922
923 dma_pool_free(chan->desc_pool, desc, txd->phys);
924 }
925}
926
927static int mmp_pdma_remove(struct platform_device *op)
928{
929 struct mmp_pdma_device *pdev = platform_get_drvdata(op);
930 struct mmp_pdma_phy *phy;
931 int i, irq = 0, irq_num = 0;
932
933
934 for (i = 0; i < pdev->dma_channels; i++) {
935 if (platform_get_irq(op, i) > 0)
936 irq_num++;
937 }
938
939 if (irq_num != pdev->dma_channels) {
940 irq = platform_get_irq(op, 0);
941 devm_free_irq(&op->dev, irq, pdev);
942 } else {
943 for (i = 0; i < pdev->dma_channels; i++) {
944 phy = &pdev->phy[i];
945 irq = platform_get_irq(op, i);
946 devm_free_irq(&op->dev, irq, phy);
947 }
948 }
949
950 dma_async_device_unregister(&pdev->device);
951 return 0;
952}
953
954static int mmp_pdma_chan_init(struct mmp_pdma_device *pdev, int idx, int irq)
955{
956 struct mmp_pdma_phy *phy = &pdev->phy[idx];
957 struct mmp_pdma_chan *chan;
958 int ret;
959
960 chan = devm_kzalloc(pdev->dev, sizeof(*chan), GFP_KERNEL);
961 if (chan == NULL)
962 return -ENOMEM;
963
964 phy->idx = idx;
965 phy->base = pdev->base;
966
967 if (irq) {
968 ret = devm_request_irq(pdev->dev, irq, mmp_pdma_chan_handler,
969 IRQF_SHARED, "pdma", phy);
970 if (ret) {
971 dev_err(pdev->dev, "channel request irq fail!\n");
972 return ret;
973 }
974 }
975
976 spin_lock_init(&chan->desc_lock);
977 chan->dev = pdev->dev;
978 chan->chan.device = &pdev->device;
979 tasklet_init(&chan->tasklet, dma_do_tasklet, (unsigned long)chan);
980 INIT_LIST_HEAD(&chan->chain_pending);
981 INIT_LIST_HEAD(&chan->chain_running);
982
983 /* register virt channel to dma engine */
984 list_add_tail(&chan->chan.device_node, &pdev->device.channels);
985
986 return 0;
987}
988
989static const struct of_device_id mmp_pdma_dt_ids[] = {
990 { .compatible = "marvell,pdma-1.0", },
991 {}
992};
993MODULE_DEVICE_TABLE(of, mmp_pdma_dt_ids);
994
995static struct dma_chan *mmp_pdma_dma_xlate(struct of_phandle_args *dma_spec,
996 struct of_dma *ofdma)
997{
998 struct mmp_pdma_device *d = ofdma->of_dma_data;
999 struct dma_chan *chan;
1000
1001 chan = dma_get_any_slave_channel(&d->device);
1002 if (!chan)
1003 return NULL;
1004
1005 to_mmp_pdma_chan(chan)->drcmr = dma_spec->args[0];
1006
1007 return chan;
1008}
1009
1010static int mmp_pdma_probe(struct platform_device *op)
1011{
1012 struct mmp_pdma_device *pdev;
1013 const struct of_device_id *of_id;
1014 struct mmp_dma_platdata *pdata = dev_get_platdata(&op->dev);
1015 struct resource *iores;
1016 int i, ret, irq = 0;
1017 int dma_channels = 0, irq_num = 0;
1018 const enum dma_slave_buswidth widths =
1019 DMA_SLAVE_BUSWIDTH_1_BYTE | DMA_SLAVE_BUSWIDTH_2_BYTES |
1020 DMA_SLAVE_BUSWIDTH_4_BYTES;
1021
1022 pdev = devm_kzalloc(&op->dev, sizeof(*pdev), GFP_KERNEL);
1023 if (!pdev)
1024 return -ENOMEM;
1025
1026 pdev->dev = &op->dev;
1027
1028 spin_lock_init(&pdev->phy_lock);
1029
1030 iores = platform_get_resource(op, IORESOURCE_MEM, 0);
1031 pdev->base = devm_ioremap_resource(pdev->dev, iores);
1032 if (IS_ERR(pdev->base))
1033 return PTR_ERR(pdev->base);
1034
1035 of_id = of_match_device(mmp_pdma_dt_ids, pdev->dev);
1036 if (of_id)
1037 of_property_read_u32(pdev->dev->of_node, "#dma-channels",
1038 &dma_channels);
1039 else if (pdata && pdata->dma_channels)
1040 dma_channels = pdata->dma_channels;
1041 else
1042 dma_channels = 32; /* default 32 channel */
1043 pdev->dma_channels = dma_channels;
1044
1045 for (i = 0; i < dma_channels; i++) {
1046 if (platform_get_irq(op, i) > 0)
1047 irq_num++;
1048 }
1049
1050 pdev->phy = devm_kcalloc(pdev->dev, dma_channels, sizeof(*pdev->phy),
1051 GFP_KERNEL);
1052 if (pdev->phy == NULL)
1053 return -ENOMEM;
1054
1055 INIT_LIST_HEAD(&pdev->device.channels);
1056
1057 if (irq_num != dma_channels) {
1058 /* all chan share one irq, demux inside */
1059 irq = platform_get_irq(op, 0);
1060 ret = devm_request_irq(pdev->dev, irq, mmp_pdma_int_handler,
1061 IRQF_SHARED, "pdma", pdev);
1062 if (ret)
1063 return ret;
1064 }
1065
1066 for (i = 0; i < dma_channels; i++) {
1067 irq = (irq_num != dma_channels) ? 0 : platform_get_irq(op, i);
1068 ret = mmp_pdma_chan_init(pdev, i, irq);
1069 if (ret)
1070 return ret;
1071 }
1072
1073 dma_cap_set(DMA_SLAVE, pdev->device.cap_mask);
1074 dma_cap_set(DMA_MEMCPY, pdev->device.cap_mask);
1075 dma_cap_set(DMA_CYCLIC, pdev->device.cap_mask);
1076 dma_cap_set(DMA_PRIVATE, pdev->device.cap_mask);
1077 pdev->device.dev = &op->dev;
1078 pdev->device.device_alloc_chan_resources = mmp_pdma_alloc_chan_resources;
1079 pdev->device.device_free_chan_resources = mmp_pdma_free_chan_resources;
1080 pdev->device.device_tx_status = mmp_pdma_tx_status;
1081 pdev->device.device_prep_dma_memcpy = mmp_pdma_prep_memcpy;
1082 pdev->device.device_prep_slave_sg = mmp_pdma_prep_slave_sg;
1083 pdev->device.device_prep_dma_cyclic = mmp_pdma_prep_dma_cyclic;
1084 pdev->device.device_issue_pending = mmp_pdma_issue_pending;
1085 pdev->device.device_config = mmp_pdma_config;
1086 pdev->device.device_terminate_all = mmp_pdma_terminate_all;
1087 pdev->device.copy_align = DMAENGINE_ALIGN_8_BYTES;
1088 pdev->device.src_addr_widths = widths;
1089 pdev->device.dst_addr_widths = widths;
1090 pdev->device.directions = BIT(DMA_MEM_TO_DEV) | BIT(DMA_DEV_TO_MEM);
1091 pdev->device.residue_granularity = DMA_RESIDUE_GRANULARITY_DESCRIPTOR;
1092
1093 if (pdev->dev->coherent_dma_mask)
1094 dma_set_mask(pdev->dev, pdev->dev->coherent_dma_mask);
1095 else
1096 dma_set_mask(pdev->dev, DMA_BIT_MASK(64));
1097
1098 ret = dma_async_device_register(&pdev->device);
1099 if (ret) {
1100 dev_err(pdev->device.dev, "unable to register\n");
1101 return ret;
1102 }
1103
1104 if (op->dev.of_node) {
1105 /* Device-tree DMA controller registration */
1106 ret = of_dma_controller_register(op->dev.of_node,
1107 mmp_pdma_dma_xlate, pdev);
1108 if (ret < 0) {
1109 dev_err(&op->dev, "of_dma_controller_register failed\n");
1110 return ret;
1111 }
1112 }
1113
1114 platform_set_drvdata(op, pdev);
1115 dev_info(pdev->device.dev, "initialized %d channels\n", dma_channels);
1116 return 0;
1117}
1118
1119static const struct platform_device_id mmp_pdma_id_table[] = {
1120 { "mmp-pdma", },
1121 { },
1122};
1123
1124static struct platform_driver mmp_pdma_driver = {
1125 .driver = {
1126 .name = "mmp-pdma",
1127 .of_match_table = mmp_pdma_dt_ids,
1128 },
1129 .id_table = mmp_pdma_id_table,
1130 .probe = mmp_pdma_probe,
1131 .remove = mmp_pdma_remove,
1132};
1133
1134bool mmp_pdma_filter_fn(struct dma_chan *chan, void *param)
1135{
1136 struct mmp_pdma_chan *c = to_mmp_pdma_chan(chan);
1137
1138 if (chan->device->dev->driver != &mmp_pdma_driver.driver)
1139 return false;
1140
1141 c->drcmr = *(unsigned int *)param;
1142
1143 return true;
1144}
1145EXPORT_SYMBOL_GPL(mmp_pdma_filter_fn);
1146
1147module_platform_driver(mmp_pdma_driver);
1148
1149MODULE_DESCRIPTION("MARVELL MMP Peripheral DMA Driver");
1150MODULE_AUTHOR("Marvell International Ltd.");
1151MODULE_LICENSE("GPL v2");