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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright 2012 Marvell International Ltd.
4 */
5
6#include <linux/err.h>
7#include <linux/module.h>
8#include <linux/init.h>
9#include <linux/types.h>
10#include <linux/interrupt.h>
11#include <linux/dma-mapping.h>
12#include <linux/slab.h>
13#include <linux/dmaengine.h>
14#include <linux/platform_device.h>
15#include <linux/device.h>
16#include <linux/platform_data/mmp_dma.h>
17#include <linux/dmapool.h>
18#include <linux/of_device.h>
19#include <linux/of_dma.h>
20#include <linux/of.h>
21#include <linux/dma/mmp-pdma.h>
22
23#include "dmaengine.h"
24
25#define DCSR 0x0000
26#define DALGN 0x00a0
27#define DINT 0x00f0
28#define DDADR 0x0200
29#define DSADR(n) (0x0204 + ((n) << 4))
30#define DTADR(n) (0x0208 + ((n) << 4))
31#define DCMD 0x020c
32
33#define DCSR_RUN BIT(31) /* Run Bit (read / write) */
34#define DCSR_NODESC BIT(30) /* No-Descriptor Fetch (read / write) */
35#define DCSR_STOPIRQEN BIT(29) /* Stop Interrupt Enable (read / write) */
36#define DCSR_REQPEND BIT(8) /* Request Pending (read-only) */
37#define DCSR_STOPSTATE BIT(3) /* Stop State (read-only) */
38#define DCSR_ENDINTR BIT(2) /* End Interrupt (read / write) */
39#define DCSR_STARTINTR BIT(1) /* Start Interrupt (read / write) */
40#define DCSR_BUSERR BIT(0) /* Bus Error Interrupt (read / write) */
41
42#define DCSR_EORIRQEN BIT(28) /* End of Receive Interrupt Enable (R/W) */
43#define DCSR_EORJMPEN BIT(27) /* Jump to next descriptor on EOR */
44#define DCSR_EORSTOPEN BIT(26) /* STOP on an EOR */
45#define DCSR_SETCMPST BIT(25) /* Set Descriptor Compare Status */
46#define DCSR_CLRCMPST BIT(24) /* Clear Descriptor Compare Status */
47#define DCSR_CMPST BIT(10) /* The Descriptor Compare Status */
48#define DCSR_EORINTR BIT(9) /* The end of Receive */
49
50#define DRCMR(n) ((((n) < 64) ? 0x0100 : 0x1100) + (((n) & 0x3f) << 2))
51#define DRCMR_MAPVLD BIT(7) /* Map Valid (read / write) */
52#define DRCMR_CHLNUM 0x1f /* mask for Channel Number (read / write) */
53
54#define DDADR_DESCADDR 0xfffffff0 /* Address of next descriptor (mask) */
55#define DDADR_STOP BIT(0) /* Stop (read / write) */
56
57#define DCMD_INCSRCADDR BIT(31) /* Source Address Increment Setting. */
58#define DCMD_INCTRGADDR BIT(30) /* Target Address Increment Setting. */
59#define DCMD_FLOWSRC BIT(29) /* Flow Control by the source. */
60#define DCMD_FLOWTRG BIT(28) /* Flow Control by the target. */
61#define DCMD_STARTIRQEN BIT(22) /* Start Interrupt Enable */
62#define DCMD_ENDIRQEN BIT(21) /* End Interrupt Enable */
63#define DCMD_ENDIAN BIT(18) /* Device Endian-ness. */
64#define DCMD_BURST8 (1 << 16) /* 8 byte burst */
65#define DCMD_BURST16 (2 << 16) /* 16 byte burst */
66#define DCMD_BURST32 (3 << 16) /* 32 byte burst */
67#define DCMD_WIDTH1 (1 << 14) /* 1 byte width */
68#define DCMD_WIDTH2 (2 << 14) /* 2 byte width (HalfWord) */
69#define DCMD_WIDTH4 (3 << 14) /* 4 byte width (Word) */
70#define DCMD_LENGTH 0x01fff /* length mask (max = 8K - 1) */
71
72#define PDMA_MAX_DESC_BYTES DCMD_LENGTH
73
74struct mmp_pdma_desc_hw {
75 u32 ddadr; /* Points to the next descriptor + flags */
76 u32 dsadr; /* DSADR value for the current transfer */
77 u32 dtadr; /* DTADR value for the current transfer */
78 u32 dcmd; /* DCMD value for the current transfer */
79} __aligned(32);
80
81struct mmp_pdma_desc_sw {
82 struct mmp_pdma_desc_hw desc;
83 struct list_head node;
84 struct list_head tx_list;
85 struct dma_async_tx_descriptor async_tx;
86};
87
88struct mmp_pdma_phy;
89
90struct mmp_pdma_chan {
91 struct device *dev;
92 struct dma_chan chan;
93 struct dma_async_tx_descriptor desc;
94 struct mmp_pdma_phy *phy;
95 enum dma_transfer_direction dir;
96 struct dma_slave_config slave_config;
97
98 struct mmp_pdma_desc_sw *cyclic_first; /* first desc_sw if channel
99 * is in cyclic mode */
100
101 /* channel's basic info */
102 struct tasklet_struct tasklet;
103 u32 dcmd;
104 u32 drcmr;
105 u32 dev_addr;
106
107 /* list for desc */
108 spinlock_t desc_lock; /* Descriptor list lock */
109 struct list_head chain_pending; /* Link descriptors queue for pending */
110 struct list_head chain_running; /* Link descriptors queue for running */
111 bool idle; /* channel statue machine */
112 bool byte_align;
113
114 struct dma_pool *desc_pool; /* Descriptors pool */
115};
116
117struct mmp_pdma_phy {
118 int idx;
119 void __iomem *base;
120 struct mmp_pdma_chan *vchan;
121};
122
123struct mmp_pdma_device {
124 int dma_channels;
125 void __iomem *base;
126 struct device *dev;
127 struct dma_device device;
128 struct mmp_pdma_phy *phy;
129 spinlock_t phy_lock; /* protect alloc/free phy channels */
130};
131
132#define tx_to_mmp_pdma_desc(tx) \
133 container_of(tx, struct mmp_pdma_desc_sw, async_tx)
134#define to_mmp_pdma_desc(lh) \
135 container_of(lh, struct mmp_pdma_desc_sw, node)
136#define to_mmp_pdma_chan(dchan) \
137 container_of(dchan, struct mmp_pdma_chan, chan)
138#define to_mmp_pdma_dev(dmadev) \
139 container_of(dmadev, struct mmp_pdma_device, device)
140
141static int mmp_pdma_config_write(struct dma_chan *dchan,
142 struct dma_slave_config *cfg,
143 enum dma_transfer_direction direction);
144
145static void set_desc(struct mmp_pdma_phy *phy, dma_addr_t addr)
146{
147 u32 reg = (phy->idx << 4) + DDADR;
148
149 writel(addr, phy->base + reg);
150}
151
152static void enable_chan(struct mmp_pdma_phy *phy)
153{
154 u32 reg, dalgn;
155
156 if (!phy->vchan)
157 return;
158
159 reg = DRCMR(phy->vchan->drcmr);
160 writel(DRCMR_MAPVLD | phy->idx, phy->base + reg);
161
162 dalgn = readl(phy->base + DALGN);
163 if (phy->vchan->byte_align)
164 dalgn |= 1 << phy->idx;
165 else
166 dalgn &= ~(1 << phy->idx);
167 writel(dalgn, phy->base + DALGN);
168
169 reg = (phy->idx << 2) + DCSR;
170 writel(readl(phy->base + reg) | DCSR_RUN, phy->base + reg);
171}
172
173static void disable_chan(struct mmp_pdma_phy *phy)
174{
175 u32 reg;
176
177 if (!phy)
178 return;
179
180 reg = (phy->idx << 2) + DCSR;
181 writel(readl(phy->base + reg) & ~DCSR_RUN, phy->base + reg);
182}
183
184static int clear_chan_irq(struct mmp_pdma_phy *phy)
185{
186 u32 dcsr;
187 u32 dint = readl(phy->base + DINT);
188 u32 reg = (phy->idx << 2) + DCSR;
189
190 if (!(dint & BIT(phy->idx)))
191 return -EAGAIN;
192
193 /* clear irq */
194 dcsr = readl(phy->base + reg);
195 writel(dcsr, phy->base + reg);
196 if ((dcsr & DCSR_BUSERR) && (phy->vchan))
197 dev_warn(phy->vchan->dev, "DCSR_BUSERR\n");
198
199 return 0;
200}
201
202static irqreturn_t mmp_pdma_chan_handler(int irq, void *dev_id)
203{
204 struct mmp_pdma_phy *phy = dev_id;
205
206 if (clear_chan_irq(phy) != 0)
207 return IRQ_NONE;
208
209 tasklet_schedule(&phy->vchan->tasklet);
210 return IRQ_HANDLED;
211}
212
213static irqreturn_t mmp_pdma_int_handler(int irq, void *dev_id)
214{
215 struct mmp_pdma_device *pdev = dev_id;
216 struct mmp_pdma_phy *phy;
217 u32 dint = readl(pdev->base + DINT);
218 int i, ret;
219 int irq_num = 0;
220
221 while (dint) {
222 i = __ffs(dint);
223 /* only handle interrupts belonging to pdma driver*/
224 if (i >= pdev->dma_channels)
225 break;
226 dint &= (dint - 1);
227 phy = &pdev->phy[i];
228 ret = mmp_pdma_chan_handler(irq, phy);
229 if (ret == IRQ_HANDLED)
230 irq_num++;
231 }
232
233 if (irq_num)
234 return IRQ_HANDLED;
235
236 return IRQ_NONE;
237}
238
239/* lookup free phy channel as descending priority */
240static struct mmp_pdma_phy *lookup_phy(struct mmp_pdma_chan *pchan)
241{
242 int prio, i;
243 struct mmp_pdma_device *pdev = to_mmp_pdma_dev(pchan->chan.device);
244 struct mmp_pdma_phy *phy, *found = NULL;
245 unsigned long flags;
246
247 /*
248 * dma channel priorities
249 * ch 0 - 3, 16 - 19 <--> (0)
250 * ch 4 - 7, 20 - 23 <--> (1)
251 * ch 8 - 11, 24 - 27 <--> (2)
252 * ch 12 - 15, 28 - 31 <--> (3)
253 */
254
255 spin_lock_irqsave(&pdev->phy_lock, flags);
256 for (prio = 0; prio <= ((pdev->dma_channels - 1) & 0xf) >> 2; prio++) {
257 for (i = 0; i < pdev->dma_channels; i++) {
258 if (prio != (i & 0xf) >> 2)
259 continue;
260 phy = &pdev->phy[i];
261 if (!phy->vchan) {
262 phy->vchan = pchan;
263 found = phy;
264 goto out_unlock;
265 }
266 }
267 }
268
269out_unlock:
270 spin_unlock_irqrestore(&pdev->phy_lock, flags);
271 return found;
272}
273
274static void mmp_pdma_free_phy(struct mmp_pdma_chan *pchan)
275{
276 struct mmp_pdma_device *pdev = to_mmp_pdma_dev(pchan->chan.device);
277 unsigned long flags;
278 u32 reg;
279
280 if (!pchan->phy)
281 return;
282
283 /* clear the channel mapping in DRCMR */
284 reg = DRCMR(pchan->drcmr);
285 writel(0, pchan->phy->base + reg);
286
287 spin_lock_irqsave(&pdev->phy_lock, flags);
288 pchan->phy->vchan = NULL;
289 pchan->phy = NULL;
290 spin_unlock_irqrestore(&pdev->phy_lock, flags);
291}
292
293/*
294 * start_pending_queue - transfer any pending transactions
295 * pending list ==> running list
296 */
297static void start_pending_queue(struct mmp_pdma_chan *chan)
298{
299 struct mmp_pdma_desc_sw *desc;
300
301 /* still in running, irq will start the pending list */
302 if (!chan->idle) {
303 dev_dbg(chan->dev, "DMA controller still busy\n");
304 return;
305 }
306
307 if (list_empty(&chan->chain_pending)) {
308 /* chance to re-fetch phy channel with higher prio */
309 mmp_pdma_free_phy(chan);
310 dev_dbg(chan->dev, "no pending list\n");
311 return;
312 }
313
314 if (!chan->phy) {
315 chan->phy = lookup_phy(chan);
316 if (!chan->phy) {
317 dev_dbg(chan->dev, "no free dma channel\n");
318 return;
319 }
320 }
321
322 /*
323 * pending -> running
324 * reintilize pending list
325 */
326 desc = list_first_entry(&chan->chain_pending,
327 struct mmp_pdma_desc_sw, node);
328 list_splice_tail_init(&chan->chain_pending, &chan->chain_running);
329
330 /*
331 * Program the descriptor's address into the DMA controller,
332 * then start the DMA transaction
333 */
334 set_desc(chan->phy, desc->async_tx.phys);
335 enable_chan(chan->phy);
336 chan->idle = false;
337}
338
339
340/* desc->tx_list ==> pending list */
341static dma_cookie_t mmp_pdma_tx_submit(struct dma_async_tx_descriptor *tx)
342{
343 struct mmp_pdma_chan *chan = to_mmp_pdma_chan(tx->chan);
344 struct mmp_pdma_desc_sw *desc = tx_to_mmp_pdma_desc(tx);
345 struct mmp_pdma_desc_sw *child;
346 unsigned long flags;
347 dma_cookie_t cookie = -EBUSY;
348
349 spin_lock_irqsave(&chan->desc_lock, flags);
350
351 list_for_each_entry(child, &desc->tx_list, node) {
352 cookie = dma_cookie_assign(&child->async_tx);
353 }
354
355 /* softly link to pending list - desc->tx_list ==> pending list */
356 list_splice_tail_init(&desc->tx_list, &chan->chain_pending);
357
358 spin_unlock_irqrestore(&chan->desc_lock, flags);
359
360 return cookie;
361}
362
363static struct mmp_pdma_desc_sw *
364mmp_pdma_alloc_descriptor(struct mmp_pdma_chan *chan)
365{
366 struct mmp_pdma_desc_sw *desc;
367 dma_addr_t pdesc;
368
369 desc = dma_pool_zalloc(chan->desc_pool, GFP_ATOMIC, &pdesc);
370 if (!desc) {
371 dev_err(chan->dev, "out of memory for link descriptor\n");
372 return NULL;
373 }
374
375 INIT_LIST_HEAD(&desc->tx_list);
376 dma_async_tx_descriptor_init(&desc->async_tx, &chan->chan);
377 /* each desc has submit */
378 desc->async_tx.tx_submit = mmp_pdma_tx_submit;
379 desc->async_tx.phys = pdesc;
380
381 return desc;
382}
383
384/*
385 * mmp_pdma_alloc_chan_resources - Allocate resources for DMA channel.
386 *
387 * This function will create a dma pool for descriptor allocation.
388 * Request irq only when channel is requested
389 * Return - The number of allocated descriptors.
390 */
391
392static int mmp_pdma_alloc_chan_resources(struct dma_chan *dchan)
393{
394 struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan);
395
396 if (chan->desc_pool)
397 return 1;
398
399 chan->desc_pool = dma_pool_create(dev_name(&dchan->dev->device),
400 chan->dev,
401 sizeof(struct mmp_pdma_desc_sw),
402 __alignof__(struct mmp_pdma_desc_sw),
403 0);
404 if (!chan->desc_pool) {
405 dev_err(chan->dev, "unable to allocate descriptor pool\n");
406 return -ENOMEM;
407 }
408
409 mmp_pdma_free_phy(chan);
410 chan->idle = true;
411 chan->dev_addr = 0;
412 return 1;
413}
414
415static void mmp_pdma_free_desc_list(struct mmp_pdma_chan *chan,
416 struct list_head *list)
417{
418 struct mmp_pdma_desc_sw *desc, *_desc;
419
420 list_for_each_entry_safe(desc, _desc, list, node) {
421 list_del(&desc->node);
422 dma_pool_free(chan->desc_pool, desc, desc->async_tx.phys);
423 }
424}
425
426static void mmp_pdma_free_chan_resources(struct dma_chan *dchan)
427{
428 struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan);
429 unsigned long flags;
430
431 spin_lock_irqsave(&chan->desc_lock, flags);
432 mmp_pdma_free_desc_list(chan, &chan->chain_pending);
433 mmp_pdma_free_desc_list(chan, &chan->chain_running);
434 spin_unlock_irqrestore(&chan->desc_lock, flags);
435
436 dma_pool_destroy(chan->desc_pool);
437 chan->desc_pool = NULL;
438 chan->idle = true;
439 chan->dev_addr = 0;
440 mmp_pdma_free_phy(chan);
441 return;
442}
443
444static struct dma_async_tx_descriptor *
445mmp_pdma_prep_memcpy(struct dma_chan *dchan,
446 dma_addr_t dma_dst, dma_addr_t dma_src,
447 size_t len, unsigned long flags)
448{
449 struct mmp_pdma_chan *chan;
450 struct mmp_pdma_desc_sw *first = NULL, *prev = NULL, *new;
451 size_t copy = 0;
452
453 if (!dchan)
454 return NULL;
455
456 if (!len)
457 return NULL;
458
459 chan = to_mmp_pdma_chan(dchan);
460 chan->byte_align = false;
461
462 if (!chan->dir) {
463 chan->dir = DMA_MEM_TO_MEM;
464 chan->dcmd = DCMD_INCTRGADDR | DCMD_INCSRCADDR;
465 chan->dcmd |= DCMD_BURST32;
466 }
467
468 do {
469 /* Allocate the link descriptor from DMA pool */
470 new = mmp_pdma_alloc_descriptor(chan);
471 if (!new) {
472 dev_err(chan->dev, "no memory for desc\n");
473 goto fail;
474 }
475
476 copy = min_t(size_t, len, PDMA_MAX_DESC_BYTES);
477 if (dma_src & 0x7 || dma_dst & 0x7)
478 chan->byte_align = true;
479
480 new->desc.dcmd = chan->dcmd | (DCMD_LENGTH & copy);
481 new->desc.dsadr = dma_src;
482 new->desc.dtadr = dma_dst;
483
484 if (!first)
485 first = new;
486 else
487 prev->desc.ddadr = new->async_tx.phys;
488
489 new->async_tx.cookie = 0;
490 async_tx_ack(&new->async_tx);
491
492 prev = new;
493 len -= copy;
494
495 if (chan->dir == DMA_MEM_TO_DEV) {
496 dma_src += copy;
497 } else if (chan->dir == DMA_DEV_TO_MEM) {
498 dma_dst += copy;
499 } else if (chan->dir == DMA_MEM_TO_MEM) {
500 dma_src += copy;
501 dma_dst += copy;
502 }
503
504 /* Insert the link descriptor to the LD ring */
505 list_add_tail(&new->node, &first->tx_list);
506 } while (len);
507
508 first->async_tx.flags = flags; /* client is in control of this ack */
509 first->async_tx.cookie = -EBUSY;
510
511 /* last desc and fire IRQ */
512 new->desc.ddadr = DDADR_STOP;
513 new->desc.dcmd |= DCMD_ENDIRQEN;
514
515 chan->cyclic_first = NULL;
516
517 return &first->async_tx;
518
519fail:
520 if (first)
521 mmp_pdma_free_desc_list(chan, &first->tx_list);
522 return NULL;
523}
524
525static struct dma_async_tx_descriptor *
526mmp_pdma_prep_slave_sg(struct dma_chan *dchan, struct scatterlist *sgl,
527 unsigned int sg_len, enum dma_transfer_direction dir,
528 unsigned long flags, void *context)
529{
530 struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan);
531 struct mmp_pdma_desc_sw *first = NULL, *prev = NULL, *new = NULL;
532 size_t len, avail;
533 struct scatterlist *sg;
534 dma_addr_t addr;
535 int i;
536
537 if ((sgl == NULL) || (sg_len == 0))
538 return NULL;
539
540 chan->byte_align = false;
541
542 mmp_pdma_config_write(dchan, &chan->slave_config, dir);
543
544 for_each_sg(sgl, sg, sg_len, i) {
545 addr = sg_dma_address(sg);
546 avail = sg_dma_len(sgl);
547
548 do {
549 len = min_t(size_t, avail, PDMA_MAX_DESC_BYTES);
550 if (addr & 0x7)
551 chan->byte_align = true;
552
553 /* allocate and populate the descriptor */
554 new = mmp_pdma_alloc_descriptor(chan);
555 if (!new) {
556 dev_err(chan->dev, "no memory for desc\n");
557 goto fail;
558 }
559
560 new->desc.dcmd = chan->dcmd | (DCMD_LENGTH & len);
561 if (dir == DMA_MEM_TO_DEV) {
562 new->desc.dsadr = addr;
563 new->desc.dtadr = chan->dev_addr;
564 } else {
565 new->desc.dsadr = chan->dev_addr;
566 new->desc.dtadr = addr;
567 }
568
569 if (!first)
570 first = new;
571 else
572 prev->desc.ddadr = new->async_tx.phys;
573
574 new->async_tx.cookie = 0;
575 async_tx_ack(&new->async_tx);
576 prev = new;
577
578 /* Insert the link descriptor to the LD ring */
579 list_add_tail(&new->node, &first->tx_list);
580
581 /* update metadata */
582 addr += len;
583 avail -= len;
584 } while (avail);
585 }
586
587 first->async_tx.cookie = -EBUSY;
588 first->async_tx.flags = flags;
589
590 /* last desc and fire IRQ */
591 new->desc.ddadr = DDADR_STOP;
592 new->desc.dcmd |= DCMD_ENDIRQEN;
593
594 chan->dir = dir;
595 chan->cyclic_first = NULL;
596
597 return &first->async_tx;
598
599fail:
600 if (first)
601 mmp_pdma_free_desc_list(chan, &first->tx_list);
602 return NULL;
603}
604
605static struct dma_async_tx_descriptor *
606mmp_pdma_prep_dma_cyclic(struct dma_chan *dchan,
607 dma_addr_t buf_addr, size_t len, size_t period_len,
608 enum dma_transfer_direction direction,
609 unsigned long flags)
610{
611 struct mmp_pdma_chan *chan;
612 struct mmp_pdma_desc_sw *first = NULL, *prev = NULL, *new;
613 dma_addr_t dma_src, dma_dst;
614
615 if (!dchan || !len || !period_len)
616 return NULL;
617
618 /* the buffer length must be a multiple of period_len */
619 if (len % period_len != 0)
620 return NULL;
621
622 if (period_len > PDMA_MAX_DESC_BYTES)
623 return NULL;
624
625 chan = to_mmp_pdma_chan(dchan);
626 mmp_pdma_config_write(dchan, &chan->slave_config, direction);
627
628 switch (direction) {
629 case DMA_MEM_TO_DEV:
630 dma_src = buf_addr;
631 dma_dst = chan->dev_addr;
632 break;
633 case DMA_DEV_TO_MEM:
634 dma_dst = buf_addr;
635 dma_src = chan->dev_addr;
636 break;
637 default:
638 dev_err(chan->dev, "Unsupported direction for cyclic DMA\n");
639 return NULL;
640 }
641
642 chan->dir = direction;
643
644 do {
645 /* Allocate the link descriptor from DMA pool */
646 new = mmp_pdma_alloc_descriptor(chan);
647 if (!new) {
648 dev_err(chan->dev, "no memory for desc\n");
649 goto fail;
650 }
651
652 new->desc.dcmd = (chan->dcmd | DCMD_ENDIRQEN |
653 (DCMD_LENGTH & period_len));
654 new->desc.dsadr = dma_src;
655 new->desc.dtadr = dma_dst;
656
657 if (!first)
658 first = new;
659 else
660 prev->desc.ddadr = new->async_tx.phys;
661
662 new->async_tx.cookie = 0;
663 async_tx_ack(&new->async_tx);
664
665 prev = new;
666 len -= period_len;
667
668 if (chan->dir == DMA_MEM_TO_DEV)
669 dma_src += period_len;
670 else
671 dma_dst += period_len;
672
673 /* Insert the link descriptor to the LD ring */
674 list_add_tail(&new->node, &first->tx_list);
675 } while (len);
676
677 first->async_tx.flags = flags; /* client is in control of this ack */
678 first->async_tx.cookie = -EBUSY;
679
680 /* make the cyclic link */
681 new->desc.ddadr = first->async_tx.phys;
682 chan->cyclic_first = first;
683
684 return &first->async_tx;
685
686fail:
687 if (first)
688 mmp_pdma_free_desc_list(chan, &first->tx_list);
689 return NULL;
690}
691
692static int mmp_pdma_config_write(struct dma_chan *dchan,
693 struct dma_slave_config *cfg,
694 enum dma_transfer_direction direction)
695{
696 struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan);
697 u32 maxburst = 0, addr = 0;
698 enum dma_slave_buswidth width = DMA_SLAVE_BUSWIDTH_UNDEFINED;
699
700 if (!dchan)
701 return -EINVAL;
702
703 if (direction == DMA_DEV_TO_MEM) {
704 chan->dcmd = DCMD_INCTRGADDR | DCMD_FLOWSRC;
705 maxburst = cfg->src_maxburst;
706 width = cfg->src_addr_width;
707 addr = cfg->src_addr;
708 } else if (direction == DMA_MEM_TO_DEV) {
709 chan->dcmd = DCMD_INCSRCADDR | DCMD_FLOWTRG;
710 maxburst = cfg->dst_maxburst;
711 width = cfg->dst_addr_width;
712 addr = cfg->dst_addr;
713 }
714
715 if (width == DMA_SLAVE_BUSWIDTH_1_BYTE)
716 chan->dcmd |= DCMD_WIDTH1;
717 else if (width == DMA_SLAVE_BUSWIDTH_2_BYTES)
718 chan->dcmd |= DCMD_WIDTH2;
719 else if (width == DMA_SLAVE_BUSWIDTH_4_BYTES)
720 chan->dcmd |= DCMD_WIDTH4;
721
722 if (maxburst == 8)
723 chan->dcmd |= DCMD_BURST8;
724 else if (maxburst == 16)
725 chan->dcmd |= DCMD_BURST16;
726 else if (maxburst == 32)
727 chan->dcmd |= DCMD_BURST32;
728
729 chan->dir = direction;
730 chan->dev_addr = addr;
731 /* FIXME: drivers should be ported over to use the filter
732 * function. Once that's done, the following two lines can
733 * be removed.
734 */
735 if (cfg->slave_id)
736 chan->drcmr = cfg->slave_id;
737
738 return 0;
739}
740
741static int mmp_pdma_config(struct dma_chan *dchan,
742 struct dma_slave_config *cfg)
743{
744 struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan);
745
746 memcpy(&chan->slave_config, cfg, sizeof(*cfg));
747 return 0;
748}
749
750static int mmp_pdma_terminate_all(struct dma_chan *dchan)
751{
752 struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan);
753 unsigned long flags;
754
755 if (!dchan)
756 return -EINVAL;
757
758 disable_chan(chan->phy);
759 mmp_pdma_free_phy(chan);
760 spin_lock_irqsave(&chan->desc_lock, flags);
761 mmp_pdma_free_desc_list(chan, &chan->chain_pending);
762 mmp_pdma_free_desc_list(chan, &chan->chain_running);
763 spin_unlock_irqrestore(&chan->desc_lock, flags);
764 chan->idle = true;
765
766 return 0;
767}
768
769static unsigned int mmp_pdma_residue(struct mmp_pdma_chan *chan,
770 dma_cookie_t cookie)
771{
772 struct mmp_pdma_desc_sw *sw;
773 u32 curr, residue = 0;
774 bool passed = false;
775 bool cyclic = chan->cyclic_first != NULL;
776
777 /*
778 * If the channel does not have a phy pointer anymore, it has already
779 * been completed. Therefore, its residue is 0.
780 */
781 if (!chan->phy)
782 return 0;
783
784 if (chan->dir == DMA_DEV_TO_MEM)
785 curr = readl(chan->phy->base + DTADR(chan->phy->idx));
786 else
787 curr = readl(chan->phy->base + DSADR(chan->phy->idx));
788
789 list_for_each_entry(sw, &chan->chain_running, node) {
790 u32 start, end, len;
791
792 if (chan->dir == DMA_DEV_TO_MEM)
793 start = sw->desc.dtadr;
794 else
795 start = sw->desc.dsadr;
796
797 len = sw->desc.dcmd & DCMD_LENGTH;
798 end = start + len;
799
800 /*
801 * 'passed' will be latched once we found the descriptor which
802 * lies inside the boundaries of the curr pointer. All
803 * descriptors that occur in the list _after_ we found that
804 * partially handled descriptor are still to be processed and
805 * are hence added to the residual bytes counter.
806 */
807
808 if (passed) {
809 residue += len;
810 } else if (curr >= start && curr <= end) {
811 residue += end - curr;
812 passed = true;
813 }
814
815 /*
816 * Descriptors that have the ENDIRQEN bit set mark the end of a
817 * transaction chain, and the cookie assigned with it has been
818 * returned previously from mmp_pdma_tx_submit().
819 *
820 * In case we have multiple transactions in the running chain,
821 * and the cookie does not match the one the user asked us
822 * about, reset the state variables and start over.
823 *
824 * This logic does not apply to cyclic transactions, where all
825 * descriptors have the ENDIRQEN bit set, and for which we
826 * can't have multiple transactions on one channel anyway.
827 */
828 if (cyclic || !(sw->desc.dcmd & DCMD_ENDIRQEN))
829 continue;
830
831 if (sw->async_tx.cookie == cookie) {
832 return residue;
833 } else {
834 residue = 0;
835 passed = false;
836 }
837 }
838
839 /* We should only get here in case of cyclic transactions */
840 return residue;
841}
842
843static enum dma_status mmp_pdma_tx_status(struct dma_chan *dchan,
844 dma_cookie_t cookie,
845 struct dma_tx_state *txstate)
846{
847 struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan);
848 enum dma_status ret;
849
850 ret = dma_cookie_status(dchan, cookie, txstate);
851 if (likely(ret != DMA_ERROR))
852 dma_set_residue(txstate, mmp_pdma_residue(chan, cookie));
853
854 return ret;
855}
856
857/*
858 * mmp_pdma_issue_pending - Issue the DMA start command
859 * pending list ==> running list
860 */
861static void mmp_pdma_issue_pending(struct dma_chan *dchan)
862{
863 struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan);
864 unsigned long flags;
865
866 spin_lock_irqsave(&chan->desc_lock, flags);
867 start_pending_queue(chan);
868 spin_unlock_irqrestore(&chan->desc_lock, flags);
869}
870
871/*
872 * dma_do_tasklet
873 * Do call back
874 * Start pending list
875 */
876static void dma_do_tasklet(unsigned long data)
877{
878 struct mmp_pdma_chan *chan = (struct mmp_pdma_chan *)data;
879 struct mmp_pdma_desc_sw *desc, *_desc;
880 LIST_HEAD(chain_cleanup);
881 unsigned long flags;
882 struct dmaengine_desc_callback cb;
883
884 if (chan->cyclic_first) {
885 spin_lock_irqsave(&chan->desc_lock, flags);
886 desc = chan->cyclic_first;
887 dmaengine_desc_get_callback(&desc->async_tx, &cb);
888 spin_unlock_irqrestore(&chan->desc_lock, flags);
889
890 dmaengine_desc_callback_invoke(&cb, NULL);
891
892 return;
893 }
894
895 /* submit pending list; callback for each desc; free desc */
896 spin_lock_irqsave(&chan->desc_lock, flags);
897
898 list_for_each_entry_safe(desc, _desc, &chan->chain_running, node) {
899 /*
900 * move the descriptors to a temporary list so we can drop
901 * the lock during the entire cleanup operation
902 */
903 list_move(&desc->node, &chain_cleanup);
904
905 /*
906 * Look for the first list entry which has the ENDIRQEN flag
907 * set. That is the descriptor we got an interrupt for, so
908 * complete that transaction and its cookie.
909 */
910 if (desc->desc.dcmd & DCMD_ENDIRQEN) {
911 dma_cookie_t cookie = desc->async_tx.cookie;
912 dma_cookie_complete(&desc->async_tx);
913 dev_dbg(chan->dev, "completed_cookie=%d\n", cookie);
914 break;
915 }
916 }
917
918 /*
919 * The hardware is idle and ready for more when the
920 * chain_running list is empty.
921 */
922 chan->idle = list_empty(&chan->chain_running);
923
924 /* Start any pending transactions automatically */
925 start_pending_queue(chan);
926 spin_unlock_irqrestore(&chan->desc_lock, flags);
927
928 /* Run the callback for each descriptor, in order */
929 list_for_each_entry_safe(desc, _desc, &chain_cleanup, node) {
930 struct dma_async_tx_descriptor *txd = &desc->async_tx;
931
932 /* Remove from the list of transactions */
933 list_del(&desc->node);
934 /* Run the link descriptor callback function */
935 dmaengine_desc_get_callback(txd, &cb);
936 dmaengine_desc_callback_invoke(&cb, NULL);
937
938 dma_pool_free(chan->desc_pool, desc, txd->phys);
939 }
940}
941
942static int mmp_pdma_remove(struct platform_device *op)
943{
944 struct mmp_pdma_device *pdev = platform_get_drvdata(op);
945 struct mmp_pdma_phy *phy;
946 int i, irq = 0, irq_num = 0;
947
948 if (op->dev.of_node)
949 of_dma_controller_free(op->dev.of_node);
950
951 for (i = 0; i < pdev->dma_channels; i++) {
952 if (platform_get_irq(op, i) > 0)
953 irq_num++;
954 }
955
956 if (irq_num != pdev->dma_channels) {
957 irq = platform_get_irq(op, 0);
958 devm_free_irq(&op->dev, irq, pdev);
959 } else {
960 for (i = 0; i < pdev->dma_channels; i++) {
961 phy = &pdev->phy[i];
962 irq = platform_get_irq(op, i);
963 devm_free_irq(&op->dev, irq, phy);
964 }
965 }
966
967 dma_async_device_unregister(&pdev->device);
968 return 0;
969}
970
971static int mmp_pdma_chan_init(struct mmp_pdma_device *pdev, int idx, int irq)
972{
973 struct mmp_pdma_phy *phy = &pdev->phy[idx];
974 struct mmp_pdma_chan *chan;
975 int ret;
976
977 chan = devm_kzalloc(pdev->dev, sizeof(*chan), GFP_KERNEL);
978 if (chan == NULL)
979 return -ENOMEM;
980
981 phy->idx = idx;
982 phy->base = pdev->base;
983
984 if (irq) {
985 ret = devm_request_irq(pdev->dev, irq, mmp_pdma_chan_handler,
986 IRQF_SHARED, "pdma", phy);
987 if (ret) {
988 dev_err(pdev->dev, "channel request irq fail!\n");
989 return ret;
990 }
991 }
992
993 spin_lock_init(&chan->desc_lock);
994 chan->dev = pdev->dev;
995 chan->chan.device = &pdev->device;
996 tasklet_init(&chan->tasklet, dma_do_tasklet, (unsigned long)chan);
997 INIT_LIST_HEAD(&chan->chain_pending);
998 INIT_LIST_HEAD(&chan->chain_running);
999
1000 /* register virt channel to dma engine */
1001 list_add_tail(&chan->chan.device_node, &pdev->device.channels);
1002
1003 return 0;
1004}
1005
1006static const struct of_device_id mmp_pdma_dt_ids[] = {
1007 { .compatible = "marvell,pdma-1.0", },
1008 {}
1009};
1010MODULE_DEVICE_TABLE(of, mmp_pdma_dt_ids);
1011
1012static struct dma_chan *mmp_pdma_dma_xlate(struct of_phandle_args *dma_spec,
1013 struct of_dma *ofdma)
1014{
1015 struct mmp_pdma_device *d = ofdma->of_dma_data;
1016 struct dma_chan *chan;
1017
1018 chan = dma_get_any_slave_channel(&d->device);
1019 if (!chan)
1020 return NULL;
1021
1022 to_mmp_pdma_chan(chan)->drcmr = dma_spec->args[0];
1023
1024 return chan;
1025}
1026
1027static int mmp_pdma_probe(struct platform_device *op)
1028{
1029 struct mmp_pdma_device *pdev;
1030 const struct of_device_id *of_id;
1031 struct mmp_dma_platdata *pdata = dev_get_platdata(&op->dev);
1032 struct resource *iores;
1033 int i, ret, irq = 0;
1034 int dma_channels = 0, irq_num = 0;
1035 const enum dma_slave_buswidth widths =
1036 DMA_SLAVE_BUSWIDTH_1_BYTE | DMA_SLAVE_BUSWIDTH_2_BYTES |
1037 DMA_SLAVE_BUSWIDTH_4_BYTES;
1038
1039 pdev = devm_kzalloc(&op->dev, sizeof(*pdev), GFP_KERNEL);
1040 if (!pdev)
1041 return -ENOMEM;
1042
1043 pdev->dev = &op->dev;
1044
1045 spin_lock_init(&pdev->phy_lock);
1046
1047 iores = platform_get_resource(op, IORESOURCE_MEM, 0);
1048 pdev->base = devm_ioremap_resource(pdev->dev, iores);
1049 if (IS_ERR(pdev->base))
1050 return PTR_ERR(pdev->base);
1051
1052 of_id = of_match_device(mmp_pdma_dt_ids, pdev->dev);
1053 if (of_id)
1054 of_property_read_u32(pdev->dev->of_node, "#dma-channels",
1055 &dma_channels);
1056 else if (pdata && pdata->dma_channels)
1057 dma_channels = pdata->dma_channels;
1058 else
1059 dma_channels = 32; /* default 32 channel */
1060 pdev->dma_channels = dma_channels;
1061
1062 for (i = 0; i < dma_channels; i++) {
1063 if (platform_get_irq_optional(op, i) > 0)
1064 irq_num++;
1065 }
1066
1067 pdev->phy = devm_kcalloc(pdev->dev, dma_channels, sizeof(*pdev->phy),
1068 GFP_KERNEL);
1069 if (pdev->phy == NULL)
1070 return -ENOMEM;
1071
1072 INIT_LIST_HEAD(&pdev->device.channels);
1073
1074 if (irq_num != dma_channels) {
1075 /* all chan share one irq, demux inside */
1076 irq = platform_get_irq(op, 0);
1077 ret = devm_request_irq(pdev->dev, irq, mmp_pdma_int_handler,
1078 IRQF_SHARED, "pdma", pdev);
1079 if (ret)
1080 return ret;
1081 }
1082
1083 for (i = 0; i < dma_channels; i++) {
1084 irq = (irq_num != dma_channels) ? 0 : platform_get_irq(op, i);
1085 ret = mmp_pdma_chan_init(pdev, i, irq);
1086 if (ret)
1087 return ret;
1088 }
1089
1090 dma_cap_set(DMA_SLAVE, pdev->device.cap_mask);
1091 dma_cap_set(DMA_MEMCPY, pdev->device.cap_mask);
1092 dma_cap_set(DMA_CYCLIC, pdev->device.cap_mask);
1093 dma_cap_set(DMA_PRIVATE, pdev->device.cap_mask);
1094 pdev->device.dev = &op->dev;
1095 pdev->device.device_alloc_chan_resources = mmp_pdma_alloc_chan_resources;
1096 pdev->device.device_free_chan_resources = mmp_pdma_free_chan_resources;
1097 pdev->device.device_tx_status = mmp_pdma_tx_status;
1098 pdev->device.device_prep_dma_memcpy = mmp_pdma_prep_memcpy;
1099 pdev->device.device_prep_slave_sg = mmp_pdma_prep_slave_sg;
1100 pdev->device.device_prep_dma_cyclic = mmp_pdma_prep_dma_cyclic;
1101 pdev->device.device_issue_pending = mmp_pdma_issue_pending;
1102 pdev->device.device_config = mmp_pdma_config;
1103 pdev->device.device_terminate_all = mmp_pdma_terminate_all;
1104 pdev->device.copy_align = DMAENGINE_ALIGN_8_BYTES;
1105 pdev->device.src_addr_widths = widths;
1106 pdev->device.dst_addr_widths = widths;
1107 pdev->device.directions = BIT(DMA_MEM_TO_DEV) | BIT(DMA_DEV_TO_MEM);
1108 pdev->device.residue_granularity = DMA_RESIDUE_GRANULARITY_DESCRIPTOR;
1109
1110 if (pdev->dev->coherent_dma_mask)
1111 dma_set_mask(pdev->dev, pdev->dev->coherent_dma_mask);
1112 else
1113 dma_set_mask(pdev->dev, DMA_BIT_MASK(64));
1114
1115 ret = dma_async_device_register(&pdev->device);
1116 if (ret) {
1117 dev_err(pdev->device.dev, "unable to register\n");
1118 return ret;
1119 }
1120
1121 if (op->dev.of_node) {
1122 /* Device-tree DMA controller registration */
1123 ret = of_dma_controller_register(op->dev.of_node,
1124 mmp_pdma_dma_xlate, pdev);
1125 if (ret < 0) {
1126 dev_err(&op->dev, "of_dma_controller_register failed\n");
1127 return ret;
1128 }
1129 }
1130
1131 platform_set_drvdata(op, pdev);
1132 dev_info(pdev->device.dev, "initialized %d channels\n", dma_channels);
1133 return 0;
1134}
1135
1136static const struct platform_device_id mmp_pdma_id_table[] = {
1137 { "mmp-pdma", },
1138 { },
1139};
1140
1141static struct platform_driver mmp_pdma_driver = {
1142 .driver = {
1143 .name = "mmp-pdma",
1144 .of_match_table = mmp_pdma_dt_ids,
1145 },
1146 .id_table = mmp_pdma_id_table,
1147 .probe = mmp_pdma_probe,
1148 .remove = mmp_pdma_remove,
1149};
1150
1151bool mmp_pdma_filter_fn(struct dma_chan *chan, void *param)
1152{
1153 struct mmp_pdma_chan *c = to_mmp_pdma_chan(chan);
1154
1155 if (chan->device->dev->driver != &mmp_pdma_driver.driver)
1156 return false;
1157
1158 c->drcmr = *(unsigned int *)param;
1159
1160 return true;
1161}
1162EXPORT_SYMBOL_GPL(mmp_pdma_filter_fn);
1163
1164module_platform_driver(mmp_pdma_driver);
1165
1166MODULE_DESCRIPTION("MARVELL MMP Peripheral DMA Driver");
1167MODULE_AUTHOR("Marvell International Ltd.");
1168MODULE_LICENSE("GPL v2");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright 2012 Marvell International Ltd.
4 */
5
6#include <linux/err.h>
7#include <linux/module.h>
8#include <linux/init.h>
9#include <linux/types.h>
10#include <linux/interrupt.h>
11#include <linux/dma-mapping.h>
12#include <linux/slab.h>
13#include <linux/dmaengine.h>
14#include <linux/platform_device.h>
15#include <linux/device.h>
16#include <linux/platform_data/mmp_dma.h>
17#include <linux/dmapool.h>
18#include <linux/of_device.h>
19#include <linux/of_dma.h>
20#include <linux/of.h>
21
22#include "dmaengine.h"
23
24#define DCSR 0x0000
25#define DALGN 0x00a0
26#define DINT 0x00f0
27#define DDADR 0x0200
28#define DSADR(n) (0x0204 + ((n) << 4))
29#define DTADR(n) (0x0208 + ((n) << 4))
30#define DCMD 0x020c
31
32#define DCSR_RUN BIT(31) /* Run Bit (read / write) */
33#define DCSR_NODESC BIT(30) /* No-Descriptor Fetch (read / write) */
34#define DCSR_STOPIRQEN BIT(29) /* Stop Interrupt Enable (read / write) */
35#define DCSR_REQPEND BIT(8) /* Request Pending (read-only) */
36#define DCSR_STOPSTATE BIT(3) /* Stop State (read-only) */
37#define DCSR_ENDINTR BIT(2) /* End Interrupt (read / write) */
38#define DCSR_STARTINTR BIT(1) /* Start Interrupt (read / write) */
39#define DCSR_BUSERR BIT(0) /* Bus Error Interrupt (read / write) */
40
41#define DCSR_EORIRQEN BIT(28) /* End of Receive Interrupt Enable (R/W) */
42#define DCSR_EORJMPEN BIT(27) /* Jump to next descriptor on EOR */
43#define DCSR_EORSTOPEN BIT(26) /* STOP on an EOR */
44#define DCSR_SETCMPST BIT(25) /* Set Descriptor Compare Status */
45#define DCSR_CLRCMPST BIT(24) /* Clear Descriptor Compare Status */
46#define DCSR_CMPST BIT(10) /* The Descriptor Compare Status */
47#define DCSR_EORINTR BIT(9) /* The end of Receive */
48
49#define DRCMR(n) ((((n) < 64) ? 0x0100 : 0x1100) + (((n) & 0x3f) << 2))
50#define DRCMR_MAPVLD BIT(7) /* Map Valid (read / write) */
51#define DRCMR_CHLNUM 0x1f /* mask for Channel Number (read / write) */
52
53#define DDADR_DESCADDR 0xfffffff0 /* Address of next descriptor (mask) */
54#define DDADR_STOP BIT(0) /* Stop (read / write) */
55
56#define DCMD_INCSRCADDR BIT(31) /* Source Address Increment Setting. */
57#define DCMD_INCTRGADDR BIT(30) /* Target Address Increment Setting. */
58#define DCMD_FLOWSRC BIT(29) /* Flow Control by the source. */
59#define DCMD_FLOWTRG BIT(28) /* Flow Control by the target. */
60#define DCMD_STARTIRQEN BIT(22) /* Start Interrupt Enable */
61#define DCMD_ENDIRQEN BIT(21) /* End Interrupt Enable */
62#define DCMD_ENDIAN BIT(18) /* Device Endian-ness. */
63#define DCMD_BURST8 (1 << 16) /* 8 byte burst */
64#define DCMD_BURST16 (2 << 16) /* 16 byte burst */
65#define DCMD_BURST32 (3 << 16) /* 32 byte burst */
66#define DCMD_WIDTH1 (1 << 14) /* 1 byte width */
67#define DCMD_WIDTH2 (2 << 14) /* 2 byte width (HalfWord) */
68#define DCMD_WIDTH4 (3 << 14) /* 4 byte width (Word) */
69#define DCMD_LENGTH 0x01fff /* length mask (max = 8K - 1) */
70
71#define PDMA_MAX_DESC_BYTES DCMD_LENGTH
72
73struct mmp_pdma_desc_hw {
74 u32 ddadr; /* Points to the next descriptor + flags */
75 u32 dsadr; /* DSADR value for the current transfer */
76 u32 dtadr; /* DTADR value for the current transfer */
77 u32 dcmd; /* DCMD value for the current transfer */
78} __aligned(32);
79
80struct mmp_pdma_desc_sw {
81 struct mmp_pdma_desc_hw desc;
82 struct list_head node;
83 struct list_head tx_list;
84 struct dma_async_tx_descriptor async_tx;
85};
86
87struct mmp_pdma_phy;
88
89struct mmp_pdma_chan {
90 struct device *dev;
91 struct dma_chan chan;
92 struct dma_async_tx_descriptor desc;
93 struct mmp_pdma_phy *phy;
94 enum dma_transfer_direction dir;
95 struct dma_slave_config slave_config;
96
97 struct mmp_pdma_desc_sw *cyclic_first; /* first desc_sw if channel
98 * is in cyclic mode */
99
100 /* channel's basic info */
101 struct tasklet_struct tasklet;
102 u32 dcmd;
103 u32 drcmr;
104 u32 dev_addr;
105
106 /* list for desc */
107 spinlock_t desc_lock; /* Descriptor list lock */
108 struct list_head chain_pending; /* Link descriptors queue for pending */
109 struct list_head chain_running; /* Link descriptors queue for running */
110 bool idle; /* channel statue machine */
111 bool byte_align;
112
113 struct dma_pool *desc_pool; /* Descriptors pool */
114};
115
116struct mmp_pdma_phy {
117 int idx;
118 void __iomem *base;
119 struct mmp_pdma_chan *vchan;
120};
121
122struct mmp_pdma_device {
123 int dma_channels;
124 void __iomem *base;
125 struct device *dev;
126 struct dma_device device;
127 struct mmp_pdma_phy *phy;
128 spinlock_t phy_lock; /* protect alloc/free phy channels */
129};
130
131#define tx_to_mmp_pdma_desc(tx) \
132 container_of(tx, struct mmp_pdma_desc_sw, async_tx)
133#define to_mmp_pdma_desc(lh) \
134 container_of(lh, struct mmp_pdma_desc_sw, node)
135#define to_mmp_pdma_chan(dchan) \
136 container_of(dchan, struct mmp_pdma_chan, chan)
137#define to_mmp_pdma_dev(dmadev) \
138 container_of(dmadev, struct mmp_pdma_device, device)
139
140static int mmp_pdma_config_write(struct dma_chan *dchan,
141 struct dma_slave_config *cfg,
142 enum dma_transfer_direction direction);
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 /* only handle interrupts belonging to pdma driver*/
223 if (i >= pdev->dma_channels)
224 break;
225 dint &= (dint - 1);
226 phy = &pdev->phy[i];
227 ret = mmp_pdma_chan_handler(irq, phy);
228 if (ret == IRQ_HANDLED)
229 irq_num++;
230 }
231
232 if (irq_num)
233 return IRQ_HANDLED;
234
235 return IRQ_NONE;
236}
237
238/* lookup free phy channel as descending priority */
239static struct mmp_pdma_phy *lookup_phy(struct mmp_pdma_chan *pchan)
240{
241 int prio, i;
242 struct mmp_pdma_device *pdev = to_mmp_pdma_dev(pchan->chan.device);
243 struct mmp_pdma_phy *phy, *found = NULL;
244 unsigned long flags;
245
246 /*
247 * dma channel priorities
248 * ch 0 - 3, 16 - 19 <--> (0)
249 * ch 4 - 7, 20 - 23 <--> (1)
250 * ch 8 - 11, 24 - 27 <--> (2)
251 * ch 12 - 15, 28 - 31 <--> (3)
252 */
253
254 spin_lock_irqsave(&pdev->phy_lock, flags);
255 for (prio = 0; prio <= ((pdev->dma_channels - 1) & 0xf) >> 2; prio++) {
256 for (i = 0; i < pdev->dma_channels; i++) {
257 if (prio != (i & 0xf) >> 2)
258 continue;
259 phy = &pdev->phy[i];
260 if (!phy->vchan) {
261 phy->vchan = pchan;
262 found = phy;
263 goto out_unlock;
264 }
265 }
266 }
267
268out_unlock:
269 spin_unlock_irqrestore(&pdev->phy_lock, flags);
270 return found;
271}
272
273static void mmp_pdma_free_phy(struct mmp_pdma_chan *pchan)
274{
275 struct mmp_pdma_device *pdev = to_mmp_pdma_dev(pchan->chan.device);
276 unsigned long flags;
277 u32 reg;
278
279 if (!pchan->phy)
280 return;
281
282 /* clear the channel mapping in DRCMR */
283 reg = DRCMR(pchan->drcmr);
284 writel(0, pchan->phy->base + reg);
285
286 spin_lock_irqsave(&pdev->phy_lock, flags);
287 pchan->phy->vchan = NULL;
288 pchan->phy = NULL;
289 spin_unlock_irqrestore(&pdev->phy_lock, flags);
290}
291
292/*
293 * start_pending_queue - transfer any pending transactions
294 * pending list ==> running list
295 */
296static void start_pending_queue(struct mmp_pdma_chan *chan)
297{
298 struct mmp_pdma_desc_sw *desc;
299
300 /* still in running, irq will start the pending list */
301 if (!chan->idle) {
302 dev_dbg(chan->dev, "DMA controller still busy\n");
303 return;
304 }
305
306 if (list_empty(&chan->chain_pending)) {
307 /* chance to re-fetch phy channel with higher prio */
308 mmp_pdma_free_phy(chan);
309 dev_dbg(chan->dev, "no pending list\n");
310 return;
311 }
312
313 if (!chan->phy) {
314 chan->phy = lookup_phy(chan);
315 if (!chan->phy) {
316 dev_dbg(chan->dev, "no free dma channel\n");
317 return;
318 }
319 }
320
321 /*
322 * pending -> running
323 * reintilize pending list
324 */
325 desc = list_first_entry(&chan->chain_pending,
326 struct mmp_pdma_desc_sw, node);
327 list_splice_tail_init(&chan->chain_pending, &chan->chain_running);
328
329 /*
330 * Program the descriptor's address into the DMA controller,
331 * then start the DMA transaction
332 */
333 set_desc(chan->phy, desc->async_tx.phys);
334 enable_chan(chan->phy);
335 chan->idle = false;
336}
337
338
339/* desc->tx_list ==> pending list */
340static dma_cookie_t mmp_pdma_tx_submit(struct dma_async_tx_descriptor *tx)
341{
342 struct mmp_pdma_chan *chan = to_mmp_pdma_chan(tx->chan);
343 struct mmp_pdma_desc_sw *desc = tx_to_mmp_pdma_desc(tx);
344 struct mmp_pdma_desc_sw *child;
345 unsigned long flags;
346 dma_cookie_t cookie = -EBUSY;
347
348 spin_lock_irqsave(&chan->desc_lock, flags);
349
350 list_for_each_entry(child, &desc->tx_list, node) {
351 cookie = dma_cookie_assign(&child->async_tx);
352 }
353
354 /* softly link to pending list - desc->tx_list ==> pending list */
355 list_splice_tail_init(&desc->tx_list, &chan->chain_pending);
356
357 spin_unlock_irqrestore(&chan->desc_lock, flags);
358
359 return cookie;
360}
361
362static struct mmp_pdma_desc_sw *
363mmp_pdma_alloc_descriptor(struct mmp_pdma_chan *chan)
364{
365 struct mmp_pdma_desc_sw *desc;
366 dma_addr_t pdesc;
367
368 desc = dma_pool_zalloc(chan->desc_pool, GFP_ATOMIC, &pdesc);
369 if (!desc) {
370 dev_err(chan->dev, "out of memory for link descriptor\n");
371 return NULL;
372 }
373
374 INIT_LIST_HEAD(&desc->tx_list);
375 dma_async_tx_descriptor_init(&desc->async_tx, &chan->chan);
376 /* each desc has submit */
377 desc->async_tx.tx_submit = mmp_pdma_tx_submit;
378 desc->async_tx.phys = pdesc;
379
380 return desc;
381}
382
383/*
384 * mmp_pdma_alloc_chan_resources - Allocate resources for DMA channel.
385 *
386 * This function will create a dma pool for descriptor allocation.
387 * Request irq only when channel is requested
388 * Return - The number of allocated descriptors.
389 */
390
391static int mmp_pdma_alloc_chan_resources(struct dma_chan *dchan)
392{
393 struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan);
394
395 if (chan->desc_pool)
396 return 1;
397
398 chan->desc_pool = dma_pool_create(dev_name(&dchan->dev->device),
399 chan->dev,
400 sizeof(struct mmp_pdma_desc_sw),
401 __alignof__(struct mmp_pdma_desc_sw),
402 0);
403 if (!chan->desc_pool) {
404 dev_err(chan->dev, "unable to allocate descriptor pool\n");
405 return -ENOMEM;
406 }
407
408 mmp_pdma_free_phy(chan);
409 chan->idle = true;
410 chan->dev_addr = 0;
411 return 1;
412}
413
414static void mmp_pdma_free_desc_list(struct mmp_pdma_chan *chan,
415 struct list_head *list)
416{
417 struct mmp_pdma_desc_sw *desc, *_desc;
418
419 list_for_each_entry_safe(desc, _desc, list, node) {
420 list_del(&desc->node);
421 dma_pool_free(chan->desc_pool, desc, desc->async_tx.phys);
422 }
423}
424
425static void mmp_pdma_free_chan_resources(struct dma_chan *dchan)
426{
427 struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan);
428 unsigned long flags;
429
430 spin_lock_irqsave(&chan->desc_lock, flags);
431 mmp_pdma_free_desc_list(chan, &chan->chain_pending);
432 mmp_pdma_free_desc_list(chan, &chan->chain_running);
433 spin_unlock_irqrestore(&chan->desc_lock, flags);
434
435 dma_pool_destroy(chan->desc_pool);
436 chan->desc_pool = NULL;
437 chan->idle = true;
438 chan->dev_addr = 0;
439 mmp_pdma_free_phy(chan);
440 return;
441}
442
443static struct dma_async_tx_descriptor *
444mmp_pdma_prep_memcpy(struct dma_chan *dchan,
445 dma_addr_t dma_dst, dma_addr_t dma_src,
446 size_t len, unsigned long flags)
447{
448 struct mmp_pdma_chan *chan;
449 struct mmp_pdma_desc_sw *first = NULL, *prev = NULL, *new;
450 size_t copy = 0;
451
452 if (!dchan)
453 return NULL;
454
455 if (!len)
456 return NULL;
457
458 chan = to_mmp_pdma_chan(dchan);
459 chan->byte_align = false;
460
461 if (!chan->dir) {
462 chan->dir = DMA_MEM_TO_MEM;
463 chan->dcmd = DCMD_INCTRGADDR | DCMD_INCSRCADDR;
464 chan->dcmd |= DCMD_BURST32;
465 }
466
467 do {
468 /* Allocate the link descriptor from DMA pool */
469 new = mmp_pdma_alloc_descriptor(chan);
470 if (!new) {
471 dev_err(chan->dev, "no memory for desc\n");
472 goto fail;
473 }
474
475 copy = min_t(size_t, len, PDMA_MAX_DESC_BYTES);
476 if (dma_src & 0x7 || dma_dst & 0x7)
477 chan->byte_align = true;
478
479 new->desc.dcmd = chan->dcmd | (DCMD_LENGTH & copy);
480 new->desc.dsadr = dma_src;
481 new->desc.dtadr = dma_dst;
482
483 if (!first)
484 first = new;
485 else
486 prev->desc.ddadr = new->async_tx.phys;
487
488 new->async_tx.cookie = 0;
489 async_tx_ack(&new->async_tx);
490
491 prev = new;
492 len -= copy;
493
494 if (chan->dir == DMA_MEM_TO_DEV) {
495 dma_src += copy;
496 } else if (chan->dir == DMA_DEV_TO_MEM) {
497 dma_dst += copy;
498 } else if (chan->dir == DMA_MEM_TO_MEM) {
499 dma_src += copy;
500 dma_dst += copy;
501 }
502
503 /* Insert the link descriptor to the LD ring */
504 list_add_tail(&new->node, &first->tx_list);
505 } while (len);
506
507 first->async_tx.flags = flags; /* client is in control of this ack */
508 first->async_tx.cookie = -EBUSY;
509
510 /* last desc and fire IRQ */
511 new->desc.ddadr = DDADR_STOP;
512 new->desc.dcmd |= DCMD_ENDIRQEN;
513
514 chan->cyclic_first = NULL;
515
516 return &first->async_tx;
517
518fail:
519 if (first)
520 mmp_pdma_free_desc_list(chan, &first->tx_list);
521 return NULL;
522}
523
524static struct dma_async_tx_descriptor *
525mmp_pdma_prep_slave_sg(struct dma_chan *dchan, struct scatterlist *sgl,
526 unsigned int sg_len, enum dma_transfer_direction dir,
527 unsigned long flags, void *context)
528{
529 struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan);
530 struct mmp_pdma_desc_sw *first = NULL, *prev = NULL, *new = NULL;
531 size_t len, avail;
532 struct scatterlist *sg;
533 dma_addr_t addr;
534 int i;
535
536 if ((sgl == NULL) || (sg_len == 0))
537 return NULL;
538
539 chan->byte_align = false;
540
541 mmp_pdma_config_write(dchan, &chan->slave_config, dir);
542
543 for_each_sg(sgl, sg, sg_len, i) {
544 addr = sg_dma_address(sg);
545 avail = sg_dma_len(sgl);
546
547 do {
548 len = min_t(size_t, avail, PDMA_MAX_DESC_BYTES);
549 if (addr & 0x7)
550 chan->byte_align = true;
551
552 /* allocate and populate the descriptor */
553 new = mmp_pdma_alloc_descriptor(chan);
554 if (!new) {
555 dev_err(chan->dev, "no memory for desc\n");
556 goto fail;
557 }
558
559 new->desc.dcmd = chan->dcmd | (DCMD_LENGTH & len);
560 if (dir == DMA_MEM_TO_DEV) {
561 new->desc.dsadr = addr;
562 new->desc.dtadr = chan->dev_addr;
563 } else {
564 new->desc.dsadr = chan->dev_addr;
565 new->desc.dtadr = addr;
566 }
567
568 if (!first)
569 first = new;
570 else
571 prev->desc.ddadr = new->async_tx.phys;
572
573 new->async_tx.cookie = 0;
574 async_tx_ack(&new->async_tx);
575 prev = new;
576
577 /* Insert the link descriptor to the LD ring */
578 list_add_tail(&new->node, &first->tx_list);
579
580 /* update metadata */
581 addr += len;
582 avail -= len;
583 } while (avail);
584 }
585
586 first->async_tx.cookie = -EBUSY;
587 first->async_tx.flags = flags;
588
589 /* last desc and fire IRQ */
590 new->desc.ddadr = DDADR_STOP;
591 new->desc.dcmd |= DCMD_ENDIRQEN;
592
593 chan->dir = dir;
594 chan->cyclic_first = NULL;
595
596 return &first->async_tx;
597
598fail:
599 if (first)
600 mmp_pdma_free_desc_list(chan, &first->tx_list);
601 return NULL;
602}
603
604static struct dma_async_tx_descriptor *
605mmp_pdma_prep_dma_cyclic(struct dma_chan *dchan,
606 dma_addr_t buf_addr, size_t len, size_t period_len,
607 enum dma_transfer_direction direction,
608 unsigned long flags)
609{
610 struct mmp_pdma_chan *chan;
611 struct mmp_pdma_desc_sw *first = NULL, *prev = NULL, *new;
612 dma_addr_t dma_src, dma_dst;
613
614 if (!dchan || !len || !period_len)
615 return NULL;
616
617 /* the buffer length must be a multiple of period_len */
618 if (len % period_len != 0)
619 return NULL;
620
621 if (period_len > PDMA_MAX_DESC_BYTES)
622 return NULL;
623
624 chan = to_mmp_pdma_chan(dchan);
625 mmp_pdma_config_write(dchan, &chan->slave_config, direction);
626
627 switch (direction) {
628 case DMA_MEM_TO_DEV:
629 dma_src = buf_addr;
630 dma_dst = chan->dev_addr;
631 break;
632 case DMA_DEV_TO_MEM:
633 dma_dst = buf_addr;
634 dma_src = chan->dev_addr;
635 break;
636 default:
637 dev_err(chan->dev, "Unsupported direction for cyclic DMA\n");
638 return NULL;
639 }
640
641 chan->dir = direction;
642
643 do {
644 /* Allocate the link descriptor from DMA pool */
645 new = mmp_pdma_alloc_descriptor(chan);
646 if (!new) {
647 dev_err(chan->dev, "no memory for desc\n");
648 goto fail;
649 }
650
651 new->desc.dcmd = (chan->dcmd | DCMD_ENDIRQEN |
652 (DCMD_LENGTH & period_len));
653 new->desc.dsadr = dma_src;
654 new->desc.dtadr = dma_dst;
655
656 if (!first)
657 first = new;
658 else
659 prev->desc.ddadr = new->async_tx.phys;
660
661 new->async_tx.cookie = 0;
662 async_tx_ack(&new->async_tx);
663
664 prev = new;
665 len -= period_len;
666
667 if (chan->dir == DMA_MEM_TO_DEV)
668 dma_src += period_len;
669 else
670 dma_dst += period_len;
671
672 /* Insert the link descriptor to the LD ring */
673 list_add_tail(&new->node, &first->tx_list);
674 } while (len);
675
676 first->async_tx.flags = flags; /* client is in control of this ack */
677 first->async_tx.cookie = -EBUSY;
678
679 /* make the cyclic link */
680 new->desc.ddadr = first->async_tx.phys;
681 chan->cyclic_first = first;
682
683 return &first->async_tx;
684
685fail:
686 if (first)
687 mmp_pdma_free_desc_list(chan, &first->tx_list);
688 return NULL;
689}
690
691static int mmp_pdma_config_write(struct dma_chan *dchan,
692 struct dma_slave_config *cfg,
693 enum dma_transfer_direction direction)
694{
695 struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan);
696 u32 maxburst = 0, addr = 0;
697 enum dma_slave_buswidth width = DMA_SLAVE_BUSWIDTH_UNDEFINED;
698
699 if (!dchan)
700 return -EINVAL;
701
702 if (direction == DMA_DEV_TO_MEM) {
703 chan->dcmd = DCMD_INCTRGADDR | DCMD_FLOWSRC;
704 maxburst = cfg->src_maxburst;
705 width = cfg->src_addr_width;
706 addr = cfg->src_addr;
707 } else if (direction == DMA_MEM_TO_DEV) {
708 chan->dcmd = DCMD_INCSRCADDR | DCMD_FLOWTRG;
709 maxburst = cfg->dst_maxburst;
710 width = cfg->dst_addr_width;
711 addr = cfg->dst_addr;
712 }
713
714 if (width == DMA_SLAVE_BUSWIDTH_1_BYTE)
715 chan->dcmd |= DCMD_WIDTH1;
716 else if (width == DMA_SLAVE_BUSWIDTH_2_BYTES)
717 chan->dcmd |= DCMD_WIDTH2;
718 else if (width == DMA_SLAVE_BUSWIDTH_4_BYTES)
719 chan->dcmd |= DCMD_WIDTH4;
720
721 if (maxburst == 8)
722 chan->dcmd |= DCMD_BURST8;
723 else if (maxburst == 16)
724 chan->dcmd |= DCMD_BURST16;
725 else if (maxburst == 32)
726 chan->dcmd |= DCMD_BURST32;
727
728 chan->dir = direction;
729 chan->dev_addr = addr;
730 /* FIXME: drivers should be ported over to use the filter
731 * function. Once that's done, the following two lines can
732 * be removed.
733 */
734 if (cfg->slave_id)
735 chan->drcmr = cfg->slave_id;
736
737 return 0;
738}
739
740static int mmp_pdma_config(struct dma_chan *dchan,
741 struct dma_slave_config *cfg)
742{
743 struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan);
744
745 memcpy(&chan->slave_config, cfg, sizeof(*cfg));
746 return 0;
747}
748
749static int mmp_pdma_terminate_all(struct dma_chan *dchan)
750{
751 struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan);
752 unsigned long flags;
753
754 if (!dchan)
755 return -EINVAL;
756
757 disable_chan(chan->phy);
758 mmp_pdma_free_phy(chan);
759 spin_lock_irqsave(&chan->desc_lock, flags);
760 mmp_pdma_free_desc_list(chan, &chan->chain_pending);
761 mmp_pdma_free_desc_list(chan, &chan->chain_running);
762 spin_unlock_irqrestore(&chan->desc_lock, flags);
763 chan->idle = true;
764
765 return 0;
766}
767
768static unsigned int mmp_pdma_residue(struct mmp_pdma_chan *chan,
769 dma_cookie_t cookie)
770{
771 struct mmp_pdma_desc_sw *sw;
772 u32 curr, residue = 0;
773 bool passed = false;
774 bool cyclic = chan->cyclic_first != NULL;
775
776 /*
777 * If the channel does not have a phy pointer anymore, it has already
778 * been completed. Therefore, its residue is 0.
779 */
780 if (!chan->phy)
781 return 0;
782
783 if (chan->dir == DMA_DEV_TO_MEM)
784 curr = readl(chan->phy->base + DTADR(chan->phy->idx));
785 else
786 curr = readl(chan->phy->base + DSADR(chan->phy->idx));
787
788 list_for_each_entry(sw, &chan->chain_running, node) {
789 u32 start, end, len;
790
791 if (chan->dir == DMA_DEV_TO_MEM)
792 start = sw->desc.dtadr;
793 else
794 start = sw->desc.dsadr;
795
796 len = sw->desc.dcmd & DCMD_LENGTH;
797 end = start + len;
798
799 /*
800 * 'passed' will be latched once we found the descriptor which
801 * lies inside the boundaries of the curr pointer. All
802 * descriptors that occur in the list _after_ we found that
803 * partially handled descriptor are still to be processed and
804 * are hence added to the residual bytes counter.
805 */
806
807 if (passed) {
808 residue += len;
809 } else if (curr >= start && curr <= end) {
810 residue += end - curr;
811 passed = true;
812 }
813
814 /*
815 * Descriptors that have the ENDIRQEN bit set mark the end of a
816 * transaction chain, and the cookie assigned with it has been
817 * returned previously from mmp_pdma_tx_submit().
818 *
819 * In case we have multiple transactions in the running chain,
820 * and the cookie does not match the one the user asked us
821 * about, reset the state variables and start over.
822 *
823 * This logic does not apply to cyclic transactions, where all
824 * descriptors have the ENDIRQEN bit set, and for which we
825 * can't have multiple transactions on one channel anyway.
826 */
827 if (cyclic || !(sw->desc.dcmd & DCMD_ENDIRQEN))
828 continue;
829
830 if (sw->async_tx.cookie == cookie) {
831 return residue;
832 } else {
833 residue = 0;
834 passed = false;
835 }
836 }
837
838 /* We should only get here in case of cyclic transactions */
839 return residue;
840}
841
842static enum dma_status mmp_pdma_tx_status(struct dma_chan *dchan,
843 dma_cookie_t cookie,
844 struct dma_tx_state *txstate)
845{
846 struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan);
847 enum dma_status ret;
848
849 ret = dma_cookie_status(dchan, cookie, txstate);
850 if (likely(ret != DMA_ERROR))
851 dma_set_residue(txstate, mmp_pdma_residue(chan, cookie));
852
853 return ret;
854}
855
856/*
857 * mmp_pdma_issue_pending - Issue the DMA start command
858 * pending list ==> running list
859 */
860static void mmp_pdma_issue_pending(struct dma_chan *dchan)
861{
862 struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan);
863 unsigned long flags;
864
865 spin_lock_irqsave(&chan->desc_lock, flags);
866 start_pending_queue(chan);
867 spin_unlock_irqrestore(&chan->desc_lock, flags);
868}
869
870/*
871 * dma_do_tasklet
872 * Do call back
873 * Start pending list
874 */
875static void dma_do_tasklet(struct tasklet_struct *t)
876{
877 struct mmp_pdma_chan *chan = from_tasklet(chan, t, tasklet);
878 struct mmp_pdma_desc_sw *desc, *_desc;
879 LIST_HEAD(chain_cleanup);
880 unsigned long flags;
881 struct dmaengine_desc_callback cb;
882
883 if (chan->cyclic_first) {
884 spin_lock_irqsave(&chan->desc_lock, flags);
885 desc = chan->cyclic_first;
886 dmaengine_desc_get_callback(&desc->async_tx, &cb);
887 spin_unlock_irqrestore(&chan->desc_lock, flags);
888
889 dmaengine_desc_callback_invoke(&cb, NULL);
890
891 return;
892 }
893
894 /* submit pending list; callback for each desc; free desc */
895 spin_lock_irqsave(&chan->desc_lock, flags);
896
897 list_for_each_entry_safe(desc, _desc, &chan->chain_running, node) {
898 /*
899 * move the descriptors to a temporary list so we can drop
900 * the lock during the entire cleanup operation
901 */
902 list_move(&desc->node, &chain_cleanup);
903
904 /*
905 * Look for the first list entry which has the ENDIRQEN flag
906 * set. That is the descriptor we got an interrupt for, so
907 * complete that transaction and its cookie.
908 */
909 if (desc->desc.dcmd & DCMD_ENDIRQEN) {
910 dma_cookie_t cookie = desc->async_tx.cookie;
911 dma_cookie_complete(&desc->async_tx);
912 dev_dbg(chan->dev, "completed_cookie=%d\n", cookie);
913 break;
914 }
915 }
916
917 /*
918 * The hardware is idle and ready for more when the
919 * chain_running list is empty.
920 */
921 chan->idle = list_empty(&chan->chain_running);
922
923 /* Start any pending transactions automatically */
924 start_pending_queue(chan);
925 spin_unlock_irqrestore(&chan->desc_lock, flags);
926
927 /* Run the callback for each descriptor, in order */
928 list_for_each_entry_safe(desc, _desc, &chain_cleanup, node) {
929 struct dma_async_tx_descriptor *txd = &desc->async_tx;
930
931 /* Remove from the list of transactions */
932 list_del(&desc->node);
933 /* Run the link descriptor callback function */
934 dmaengine_desc_get_callback(txd, &cb);
935 dmaengine_desc_callback_invoke(&cb, NULL);
936
937 dma_pool_free(chan->desc_pool, desc, txd->phys);
938 }
939}
940
941static int mmp_pdma_remove(struct platform_device *op)
942{
943 struct mmp_pdma_device *pdev = platform_get_drvdata(op);
944 struct mmp_pdma_phy *phy;
945 int i, irq = 0, irq_num = 0;
946
947 if (op->dev.of_node)
948 of_dma_controller_free(op->dev.of_node);
949
950 for (i = 0; i < pdev->dma_channels; i++) {
951 if (platform_get_irq(op, i) > 0)
952 irq_num++;
953 }
954
955 if (irq_num != pdev->dma_channels) {
956 irq = platform_get_irq(op, 0);
957 devm_free_irq(&op->dev, irq, pdev);
958 } else {
959 for (i = 0; i < pdev->dma_channels; i++) {
960 phy = &pdev->phy[i];
961 irq = platform_get_irq(op, i);
962 devm_free_irq(&op->dev, irq, phy);
963 }
964 }
965
966 dma_async_device_unregister(&pdev->device);
967 return 0;
968}
969
970static int mmp_pdma_chan_init(struct mmp_pdma_device *pdev, int idx, int irq)
971{
972 struct mmp_pdma_phy *phy = &pdev->phy[idx];
973 struct mmp_pdma_chan *chan;
974 int ret;
975
976 chan = devm_kzalloc(pdev->dev, sizeof(*chan), GFP_KERNEL);
977 if (chan == NULL)
978 return -ENOMEM;
979
980 phy->idx = idx;
981 phy->base = pdev->base;
982
983 if (irq) {
984 ret = devm_request_irq(pdev->dev, irq, mmp_pdma_chan_handler,
985 IRQF_SHARED, "pdma", phy);
986 if (ret) {
987 dev_err(pdev->dev, "channel request irq fail!\n");
988 return ret;
989 }
990 }
991
992 spin_lock_init(&chan->desc_lock);
993 chan->dev = pdev->dev;
994 chan->chan.device = &pdev->device;
995 tasklet_setup(&chan->tasklet, dma_do_tasklet);
996 INIT_LIST_HEAD(&chan->chain_pending);
997 INIT_LIST_HEAD(&chan->chain_running);
998
999 /* register virt channel to dma engine */
1000 list_add_tail(&chan->chan.device_node, &pdev->device.channels);
1001
1002 return 0;
1003}
1004
1005static const struct of_device_id mmp_pdma_dt_ids[] = {
1006 { .compatible = "marvell,pdma-1.0", },
1007 {}
1008};
1009MODULE_DEVICE_TABLE(of, mmp_pdma_dt_ids);
1010
1011static struct dma_chan *mmp_pdma_dma_xlate(struct of_phandle_args *dma_spec,
1012 struct of_dma *ofdma)
1013{
1014 struct mmp_pdma_device *d = ofdma->of_dma_data;
1015 struct dma_chan *chan;
1016
1017 chan = dma_get_any_slave_channel(&d->device);
1018 if (!chan)
1019 return NULL;
1020
1021 to_mmp_pdma_chan(chan)->drcmr = dma_spec->args[0];
1022
1023 return chan;
1024}
1025
1026static int mmp_pdma_probe(struct platform_device *op)
1027{
1028 struct mmp_pdma_device *pdev;
1029 const struct of_device_id *of_id;
1030 struct mmp_dma_platdata *pdata = dev_get_platdata(&op->dev);
1031 struct resource *iores;
1032 int i, ret, irq = 0;
1033 int dma_channels = 0, irq_num = 0;
1034 const enum dma_slave_buswidth widths =
1035 DMA_SLAVE_BUSWIDTH_1_BYTE | DMA_SLAVE_BUSWIDTH_2_BYTES |
1036 DMA_SLAVE_BUSWIDTH_4_BYTES;
1037
1038 pdev = devm_kzalloc(&op->dev, sizeof(*pdev), GFP_KERNEL);
1039 if (!pdev)
1040 return -ENOMEM;
1041
1042 pdev->dev = &op->dev;
1043
1044 spin_lock_init(&pdev->phy_lock);
1045
1046 iores = platform_get_resource(op, IORESOURCE_MEM, 0);
1047 pdev->base = devm_ioremap_resource(pdev->dev, iores);
1048 if (IS_ERR(pdev->base))
1049 return PTR_ERR(pdev->base);
1050
1051 of_id = of_match_device(mmp_pdma_dt_ids, pdev->dev);
1052 if (of_id)
1053 of_property_read_u32(pdev->dev->of_node, "#dma-channels",
1054 &dma_channels);
1055 else if (pdata && pdata->dma_channels)
1056 dma_channels = pdata->dma_channels;
1057 else
1058 dma_channels = 32; /* default 32 channel */
1059 pdev->dma_channels = dma_channels;
1060
1061 for (i = 0; i < dma_channels; i++) {
1062 if (platform_get_irq_optional(op, i) > 0)
1063 irq_num++;
1064 }
1065
1066 pdev->phy = devm_kcalloc(pdev->dev, dma_channels, sizeof(*pdev->phy),
1067 GFP_KERNEL);
1068 if (pdev->phy == NULL)
1069 return -ENOMEM;
1070
1071 INIT_LIST_HEAD(&pdev->device.channels);
1072
1073 if (irq_num != dma_channels) {
1074 /* all chan share one irq, demux inside */
1075 irq = platform_get_irq(op, 0);
1076 ret = devm_request_irq(pdev->dev, irq, mmp_pdma_int_handler,
1077 IRQF_SHARED, "pdma", pdev);
1078 if (ret)
1079 return ret;
1080 }
1081
1082 for (i = 0; i < dma_channels; i++) {
1083 irq = (irq_num != dma_channels) ? 0 : platform_get_irq(op, i);
1084 ret = mmp_pdma_chan_init(pdev, i, irq);
1085 if (ret)
1086 return ret;
1087 }
1088
1089 dma_cap_set(DMA_SLAVE, pdev->device.cap_mask);
1090 dma_cap_set(DMA_MEMCPY, pdev->device.cap_mask);
1091 dma_cap_set(DMA_CYCLIC, pdev->device.cap_mask);
1092 dma_cap_set(DMA_PRIVATE, pdev->device.cap_mask);
1093 pdev->device.dev = &op->dev;
1094 pdev->device.device_alloc_chan_resources = mmp_pdma_alloc_chan_resources;
1095 pdev->device.device_free_chan_resources = mmp_pdma_free_chan_resources;
1096 pdev->device.device_tx_status = mmp_pdma_tx_status;
1097 pdev->device.device_prep_dma_memcpy = mmp_pdma_prep_memcpy;
1098 pdev->device.device_prep_slave_sg = mmp_pdma_prep_slave_sg;
1099 pdev->device.device_prep_dma_cyclic = mmp_pdma_prep_dma_cyclic;
1100 pdev->device.device_issue_pending = mmp_pdma_issue_pending;
1101 pdev->device.device_config = mmp_pdma_config;
1102 pdev->device.device_terminate_all = mmp_pdma_terminate_all;
1103 pdev->device.copy_align = DMAENGINE_ALIGN_8_BYTES;
1104 pdev->device.src_addr_widths = widths;
1105 pdev->device.dst_addr_widths = widths;
1106 pdev->device.directions = BIT(DMA_MEM_TO_DEV) | BIT(DMA_DEV_TO_MEM);
1107 pdev->device.residue_granularity = DMA_RESIDUE_GRANULARITY_DESCRIPTOR;
1108
1109 if (pdev->dev->coherent_dma_mask)
1110 dma_set_mask(pdev->dev, pdev->dev->coherent_dma_mask);
1111 else
1112 dma_set_mask(pdev->dev, DMA_BIT_MASK(64));
1113
1114 ret = dma_async_device_register(&pdev->device);
1115 if (ret) {
1116 dev_err(pdev->device.dev, "unable to register\n");
1117 return ret;
1118 }
1119
1120 if (op->dev.of_node) {
1121 /* Device-tree DMA controller registration */
1122 ret = of_dma_controller_register(op->dev.of_node,
1123 mmp_pdma_dma_xlate, pdev);
1124 if (ret < 0) {
1125 dev_err(&op->dev, "of_dma_controller_register failed\n");
1126 return ret;
1127 }
1128 }
1129
1130 platform_set_drvdata(op, pdev);
1131 dev_info(pdev->device.dev, "initialized %d channels\n", dma_channels);
1132 return 0;
1133}
1134
1135static const struct platform_device_id mmp_pdma_id_table[] = {
1136 { "mmp-pdma", },
1137 { },
1138};
1139
1140static struct platform_driver mmp_pdma_driver = {
1141 .driver = {
1142 .name = "mmp-pdma",
1143 .of_match_table = mmp_pdma_dt_ids,
1144 },
1145 .id_table = mmp_pdma_id_table,
1146 .probe = mmp_pdma_probe,
1147 .remove = mmp_pdma_remove,
1148};
1149
1150module_platform_driver(mmp_pdma_driver);
1151
1152MODULE_DESCRIPTION("MARVELL MMP Peripheral DMA Driver");
1153MODULE_AUTHOR("Marvell International Ltd.");
1154MODULE_LICENSE("GPL v2");