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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_dma.h>
19#include <linux/of.h>
20
21#include "dmaengine.h"
22
23#define DCSR 0x0000
24#define DALGN 0x00a0
25#define DINT 0x00f0
26#define DDADR 0x0200
27#define DSADR(n) (0x0204 + ((n) << 4))
28#define DTADR(n) (0x0208 + ((n) << 4))
29#define DCMD 0x020c
30
31#define DCSR_RUN BIT(31) /* Run Bit (read / write) */
32#define DCSR_NODESC BIT(30) /* No-Descriptor Fetch (read / write) */
33#define DCSR_STOPIRQEN BIT(29) /* Stop Interrupt Enable (read / write) */
34#define DCSR_REQPEND BIT(8) /* Request Pending (read-only) */
35#define DCSR_STOPSTATE BIT(3) /* Stop State (read-only) */
36#define DCSR_ENDINTR BIT(2) /* End Interrupt (read / write) */
37#define DCSR_STARTINTR BIT(1) /* Start Interrupt (read / write) */
38#define DCSR_BUSERR BIT(0) /* Bus Error Interrupt (read / write) */
39
40#define DCSR_EORIRQEN BIT(28) /* End of Receive Interrupt Enable (R/W) */
41#define DCSR_EORJMPEN BIT(27) /* Jump to next descriptor on EOR */
42#define DCSR_EORSTOPEN BIT(26) /* STOP on an EOR */
43#define DCSR_SETCMPST BIT(25) /* Set Descriptor Compare Status */
44#define DCSR_CLRCMPST BIT(24) /* Clear Descriptor Compare Status */
45#define DCSR_CMPST BIT(10) /* The Descriptor Compare Status */
46#define DCSR_EORINTR BIT(9) /* The end of Receive */
47
48#define DRCMR(n) ((((n) < 64) ? 0x0100 : 0x1100) + (((n) & 0x3f) << 2))
49#define DRCMR_MAPVLD BIT(7) /* Map Valid (read / write) */
50#define DRCMR_CHLNUM 0x1f /* mask for Channel Number (read / write) */
51
52#define DDADR_DESCADDR 0xfffffff0 /* Address of next descriptor (mask) */
53#define DDADR_STOP BIT(0) /* Stop (read / write) */
54
55#define DCMD_INCSRCADDR BIT(31) /* Source Address Increment Setting. */
56#define DCMD_INCTRGADDR BIT(30) /* Target Address Increment Setting. */
57#define DCMD_FLOWSRC BIT(29) /* Flow Control by the source. */
58#define DCMD_FLOWTRG BIT(28) /* Flow Control by the target. */
59#define DCMD_STARTIRQEN BIT(22) /* Start Interrupt Enable */
60#define DCMD_ENDIRQEN BIT(21) /* End Interrupt Enable */
61#define DCMD_ENDIAN BIT(18) /* Device Endian-ness. */
62#define DCMD_BURST8 (1 << 16) /* 8 byte burst */
63#define DCMD_BURST16 (2 << 16) /* 16 byte burst */
64#define DCMD_BURST32 (3 << 16) /* 32 byte burst */
65#define DCMD_WIDTH1 (1 << 14) /* 1 byte width */
66#define DCMD_WIDTH2 (2 << 14) /* 2 byte width (HalfWord) */
67#define DCMD_WIDTH4 (3 << 14) /* 4 byte width (Word) */
68#define DCMD_LENGTH 0x01fff /* length mask (max = 8K - 1) */
69
70#define PDMA_MAX_DESC_BYTES DCMD_LENGTH
71
72struct mmp_pdma_desc_hw {
73 u32 ddadr; /* Points to the next descriptor + flags */
74 u32 dsadr; /* DSADR value for the current transfer */
75 u32 dtadr; /* DTADR value for the current transfer */
76 u32 dcmd; /* DCMD value for the current transfer */
77} __aligned(32);
78
79struct mmp_pdma_desc_sw {
80 struct mmp_pdma_desc_hw desc;
81 struct list_head node;
82 struct list_head tx_list;
83 struct dma_async_tx_descriptor async_tx;
84};
85
86struct mmp_pdma_phy;
87
88struct mmp_pdma_chan {
89 struct device *dev;
90 struct dma_chan chan;
91 struct dma_async_tx_descriptor desc;
92 struct mmp_pdma_phy *phy;
93 enum dma_transfer_direction dir;
94 struct dma_slave_config slave_config;
95
96 struct mmp_pdma_desc_sw *cyclic_first; /* first desc_sw if channel
97 * is in cyclic mode */
98
99 /* channel's basic info */
100 struct tasklet_struct tasklet;
101 u32 dcmd;
102 u32 drcmr;
103 u32 dev_addr;
104
105 /* list for desc */
106 spinlock_t desc_lock; /* Descriptor list lock */
107 struct list_head chain_pending; /* Link descriptors queue for pending */
108 struct list_head chain_running; /* Link descriptors queue for running */
109 bool idle; /* channel statue machine */
110 bool byte_align;
111
112 struct dma_pool *desc_pool; /* Descriptors pool */
113};
114
115struct mmp_pdma_phy {
116 int idx;
117 void __iomem *base;
118 struct mmp_pdma_chan *vchan;
119};
120
121struct mmp_pdma_device {
122 int dma_channels;
123 void __iomem *base;
124 struct device *dev;
125 struct dma_device device;
126 struct mmp_pdma_phy *phy;
127 spinlock_t phy_lock; /* protect alloc/free phy channels */
128};
129
130#define tx_to_mmp_pdma_desc(tx) \
131 container_of(tx, struct mmp_pdma_desc_sw, async_tx)
132#define to_mmp_pdma_desc(lh) \
133 container_of(lh, struct mmp_pdma_desc_sw, node)
134#define to_mmp_pdma_chan(dchan) \
135 container_of(dchan, struct mmp_pdma_chan, chan)
136#define to_mmp_pdma_dev(dmadev) \
137 container_of(dmadev, struct mmp_pdma_device, device)
138
139static int mmp_pdma_config_write(struct dma_chan *dchan,
140 struct dma_slave_config *cfg,
141 enum dma_transfer_direction direction);
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 mmp_pdma_config_write(dchan, &chan->slave_config, dir);
541
542 for_each_sg(sgl, sg, sg_len, i) {
543 addr = sg_dma_address(sg);
544 avail = sg_dma_len(sgl);
545
546 do {
547 len = min_t(size_t, avail, PDMA_MAX_DESC_BYTES);
548 if (addr & 0x7)
549 chan->byte_align = true;
550
551 /* allocate and populate the descriptor */
552 new = mmp_pdma_alloc_descriptor(chan);
553 if (!new) {
554 dev_err(chan->dev, "no memory for desc\n");
555 goto fail;
556 }
557
558 new->desc.dcmd = chan->dcmd | (DCMD_LENGTH & len);
559 if (dir == DMA_MEM_TO_DEV) {
560 new->desc.dsadr = addr;
561 new->desc.dtadr = chan->dev_addr;
562 } else {
563 new->desc.dsadr = chan->dev_addr;
564 new->desc.dtadr = addr;
565 }
566
567 if (!first)
568 first = new;
569 else
570 prev->desc.ddadr = new->async_tx.phys;
571
572 new->async_tx.cookie = 0;
573 async_tx_ack(&new->async_tx);
574 prev = new;
575
576 /* Insert the link descriptor to the LD ring */
577 list_add_tail(&new->node, &first->tx_list);
578
579 /* update metadata */
580 addr += len;
581 avail -= len;
582 } while (avail);
583 }
584
585 first->async_tx.cookie = -EBUSY;
586 first->async_tx.flags = flags;
587
588 /* last desc and fire IRQ */
589 new->desc.ddadr = DDADR_STOP;
590 new->desc.dcmd |= DCMD_ENDIRQEN;
591
592 chan->dir = dir;
593 chan->cyclic_first = NULL;
594
595 return &first->async_tx;
596
597fail:
598 if (first)
599 mmp_pdma_free_desc_list(chan, &first->tx_list);
600 return NULL;
601}
602
603static struct dma_async_tx_descriptor *
604mmp_pdma_prep_dma_cyclic(struct dma_chan *dchan,
605 dma_addr_t buf_addr, size_t len, size_t period_len,
606 enum dma_transfer_direction direction,
607 unsigned long flags)
608{
609 struct mmp_pdma_chan *chan;
610 struct mmp_pdma_desc_sw *first = NULL, *prev = NULL, *new;
611 dma_addr_t dma_src, dma_dst;
612
613 if (!dchan || !len || !period_len)
614 return NULL;
615
616 /* the buffer length must be a multiple of period_len */
617 if (len % period_len != 0)
618 return NULL;
619
620 if (period_len > PDMA_MAX_DESC_BYTES)
621 return NULL;
622
623 chan = to_mmp_pdma_chan(dchan);
624 mmp_pdma_config_write(dchan, &chan->slave_config, direction);
625
626 switch (direction) {
627 case DMA_MEM_TO_DEV:
628 dma_src = buf_addr;
629 dma_dst = chan->dev_addr;
630 break;
631 case DMA_DEV_TO_MEM:
632 dma_dst = buf_addr;
633 dma_src = chan->dev_addr;
634 break;
635 default:
636 dev_err(chan->dev, "Unsupported direction for cyclic DMA\n");
637 return NULL;
638 }
639
640 chan->dir = direction;
641
642 do {
643 /* Allocate the link descriptor from DMA pool */
644 new = mmp_pdma_alloc_descriptor(chan);
645 if (!new) {
646 dev_err(chan->dev, "no memory for desc\n");
647 goto fail;
648 }
649
650 new->desc.dcmd = (chan->dcmd | DCMD_ENDIRQEN |
651 (DCMD_LENGTH & period_len));
652 new->desc.dsadr = dma_src;
653 new->desc.dtadr = dma_dst;
654
655 if (!first)
656 first = new;
657 else
658 prev->desc.ddadr = new->async_tx.phys;
659
660 new->async_tx.cookie = 0;
661 async_tx_ack(&new->async_tx);
662
663 prev = new;
664 len -= period_len;
665
666 if (chan->dir == DMA_MEM_TO_DEV)
667 dma_src += period_len;
668 else
669 dma_dst += period_len;
670
671 /* Insert the link descriptor to the LD ring */
672 list_add_tail(&new->node, &first->tx_list);
673 } while (len);
674
675 first->async_tx.flags = flags; /* client is in control of this ack */
676 first->async_tx.cookie = -EBUSY;
677
678 /* make the cyclic link */
679 new->desc.ddadr = first->async_tx.phys;
680 chan->cyclic_first = first;
681
682 return &first->async_tx;
683
684fail:
685 if (first)
686 mmp_pdma_free_desc_list(chan, &first->tx_list);
687 return NULL;
688}
689
690static int mmp_pdma_config_write(struct dma_chan *dchan,
691 struct dma_slave_config *cfg,
692 enum dma_transfer_direction direction)
693{
694 struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan);
695 u32 maxburst = 0, addr = 0;
696 enum dma_slave_buswidth width = DMA_SLAVE_BUSWIDTH_UNDEFINED;
697
698 if (!dchan)
699 return -EINVAL;
700
701 if (direction == DMA_DEV_TO_MEM) {
702 chan->dcmd = DCMD_INCTRGADDR | DCMD_FLOWSRC;
703 maxburst = cfg->src_maxburst;
704 width = cfg->src_addr_width;
705 addr = cfg->src_addr;
706 } else if (direction == DMA_MEM_TO_DEV) {
707 chan->dcmd = DCMD_INCSRCADDR | DCMD_FLOWTRG;
708 maxburst = cfg->dst_maxburst;
709 width = cfg->dst_addr_width;
710 addr = cfg->dst_addr;
711 }
712
713 if (width == DMA_SLAVE_BUSWIDTH_1_BYTE)
714 chan->dcmd |= DCMD_WIDTH1;
715 else if (width == DMA_SLAVE_BUSWIDTH_2_BYTES)
716 chan->dcmd |= DCMD_WIDTH2;
717 else if (width == DMA_SLAVE_BUSWIDTH_4_BYTES)
718 chan->dcmd |= DCMD_WIDTH4;
719
720 if (maxburst == 8)
721 chan->dcmd |= DCMD_BURST8;
722 else if (maxburst == 16)
723 chan->dcmd |= DCMD_BURST16;
724 else if (maxburst == 32)
725 chan->dcmd |= DCMD_BURST32;
726
727 chan->dir = direction;
728 chan->dev_addr = addr;
729
730 return 0;
731}
732
733static int mmp_pdma_config(struct dma_chan *dchan,
734 struct dma_slave_config *cfg)
735{
736 struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan);
737
738 memcpy(&chan->slave_config, cfg, sizeof(*cfg));
739 return 0;
740}
741
742static int mmp_pdma_terminate_all(struct dma_chan *dchan)
743{
744 struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan);
745 unsigned long flags;
746
747 if (!dchan)
748 return -EINVAL;
749
750 disable_chan(chan->phy);
751 mmp_pdma_free_phy(chan);
752 spin_lock_irqsave(&chan->desc_lock, flags);
753 mmp_pdma_free_desc_list(chan, &chan->chain_pending);
754 mmp_pdma_free_desc_list(chan, &chan->chain_running);
755 spin_unlock_irqrestore(&chan->desc_lock, flags);
756 chan->idle = true;
757
758 return 0;
759}
760
761static unsigned int mmp_pdma_residue(struct mmp_pdma_chan *chan,
762 dma_cookie_t cookie)
763{
764 struct mmp_pdma_desc_sw *sw;
765 u32 curr, residue = 0;
766 bool passed = false;
767 bool cyclic = chan->cyclic_first != NULL;
768
769 /*
770 * If the channel does not have a phy pointer anymore, it has already
771 * been completed. Therefore, its residue is 0.
772 */
773 if (!chan->phy)
774 return 0;
775
776 if (chan->dir == DMA_DEV_TO_MEM)
777 curr = readl(chan->phy->base + DTADR(chan->phy->idx));
778 else
779 curr = readl(chan->phy->base + DSADR(chan->phy->idx));
780
781 list_for_each_entry(sw, &chan->chain_running, node) {
782 u32 start, end, len;
783
784 if (chan->dir == DMA_DEV_TO_MEM)
785 start = sw->desc.dtadr;
786 else
787 start = sw->desc.dsadr;
788
789 len = sw->desc.dcmd & DCMD_LENGTH;
790 end = start + len;
791
792 /*
793 * 'passed' will be latched once we found the descriptor which
794 * lies inside the boundaries of the curr pointer. All
795 * descriptors that occur in the list _after_ we found that
796 * partially handled descriptor are still to be processed and
797 * are hence added to the residual bytes counter.
798 */
799
800 if (passed) {
801 residue += len;
802 } else if (curr >= start && curr <= end) {
803 residue += end - curr;
804 passed = true;
805 }
806
807 /*
808 * Descriptors that have the ENDIRQEN bit set mark the end of a
809 * transaction chain, and the cookie assigned with it has been
810 * returned previously from mmp_pdma_tx_submit().
811 *
812 * In case we have multiple transactions in the running chain,
813 * and the cookie does not match the one the user asked us
814 * about, reset the state variables and start over.
815 *
816 * This logic does not apply to cyclic transactions, where all
817 * descriptors have the ENDIRQEN bit set, and for which we
818 * can't have multiple transactions on one channel anyway.
819 */
820 if (cyclic || !(sw->desc.dcmd & DCMD_ENDIRQEN))
821 continue;
822
823 if (sw->async_tx.cookie == cookie) {
824 return residue;
825 } else {
826 residue = 0;
827 passed = false;
828 }
829 }
830
831 /* We should only get here in case of cyclic transactions */
832 return residue;
833}
834
835static enum dma_status mmp_pdma_tx_status(struct dma_chan *dchan,
836 dma_cookie_t cookie,
837 struct dma_tx_state *txstate)
838{
839 struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan);
840 enum dma_status ret;
841
842 ret = dma_cookie_status(dchan, cookie, txstate);
843 if (likely(ret != DMA_ERROR))
844 dma_set_residue(txstate, mmp_pdma_residue(chan, cookie));
845
846 return ret;
847}
848
849/*
850 * mmp_pdma_issue_pending - Issue the DMA start command
851 * pending list ==> running list
852 */
853static void mmp_pdma_issue_pending(struct dma_chan *dchan)
854{
855 struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan);
856 unsigned long flags;
857
858 spin_lock_irqsave(&chan->desc_lock, flags);
859 start_pending_queue(chan);
860 spin_unlock_irqrestore(&chan->desc_lock, flags);
861}
862
863/*
864 * dma_do_tasklet
865 * Do call back
866 * Start pending list
867 */
868static void dma_do_tasklet(struct tasklet_struct *t)
869{
870 struct mmp_pdma_chan *chan = from_tasklet(chan, t, tasklet);
871 struct mmp_pdma_desc_sw *desc, *_desc;
872 LIST_HEAD(chain_cleanup);
873 unsigned long flags;
874 struct dmaengine_desc_callback cb;
875
876 if (chan->cyclic_first) {
877 spin_lock_irqsave(&chan->desc_lock, flags);
878 desc = chan->cyclic_first;
879 dmaengine_desc_get_callback(&desc->async_tx, &cb);
880 spin_unlock_irqrestore(&chan->desc_lock, flags);
881
882 dmaengine_desc_callback_invoke(&cb, NULL);
883
884 return;
885 }
886
887 /* submit pending list; callback for each desc; free desc */
888 spin_lock_irqsave(&chan->desc_lock, flags);
889
890 list_for_each_entry_safe(desc, _desc, &chan->chain_running, node) {
891 /*
892 * move the descriptors to a temporary list so we can drop
893 * the lock during the entire cleanup operation
894 */
895 list_move(&desc->node, &chain_cleanup);
896
897 /*
898 * Look for the first list entry which has the ENDIRQEN flag
899 * set. That is the descriptor we got an interrupt for, so
900 * complete that transaction and its cookie.
901 */
902 if (desc->desc.dcmd & DCMD_ENDIRQEN) {
903 dma_cookie_t cookie = desc->async_tx.cookie;
904 dma_cookie_complete(&desc->async_tx);
905 dev_dbg(chan->dev, "completed_cookie=%d\n", cookie);
906 break;
907 }
908 }
909
910 /*
911 * The hardware is idle and ready for more when the
912 * chain_running list is empty.
913 */
914 chan->idle = list_empty(&chan->chain_running);
915
916 /* Start any pending transactions automatically */
917 start_pending_queue(chan);
918 spin_unlock_irqrestore(&chan->desc_lock, flags);
919
920 /* Run the callback for each descriptor, in order */
921 list_for_each_entry_safe(desc, _desc, &chain_cleanup, node) {
922 struct dma_async_tx_descriptor *txd = &desc->async_tx;
923
924 /* Remove from the list of transactions */
925 list_del(&desc->node);
926 /* Run the link descriptor callback function */
927 dmaengine_desc_get_callback(txd, &cb);
928 dmaengine_desc_callback_invoke(&cb, NULL);
929
930 dma_pool_free(chan->desc_pool, desc, txd->phys);
931 }
932}
933
934static void mmp_pdma_remove(struct platform_device *op)
935{
936 struct mmp_pdma_device *pdev = platform_get_drvdata(op);
937 struct mmp_pdma_phy *phy;
938 int i, irq = 0, irq_num = 0;
939
940 if (op->dev.of_node)
941 of_dma_controller_free(op->dev.of_node);
942
943 for (i = 0; i < pdev->dma_channels; i++) {
944 if (platform_get_irq(op, i) > 0)
945 irq_num++;
946 }
947
948 if (irq_num != pdev->dma_channels) {
949 irq = platform_get_irq(op, 0);
950 devm_free_irq(&op->dev, irq, pdev);
951 } else {
952 for (i = 0; i < pdev->dma_channels; i++) {
953 phy = &pdev->phy[i];
954 irq = platform_get_irq(op, i);
955 devm_free_irq(&op->dev, irq, phy);
956 }
957 }
958
959 dma_async_device_unregister(&pdev->device);
960}
961
962static int mmp_pdma_chan_init(struct mmp_pdma_device *pdev, int idx, int irq)
963{
964 struct mmp_pdma_phy *phy = &pdev->phy[idx];
965 struct mmp_pdma_chan *chan;
966 int ret;
967
968 chan = devm_kzalloc(pdev->dev, sizeof(*chan), GFP_KERNEL);
969 if (chan == NULL)
970 return -ENOMEM;
971
972 phy->idx = idx;
973 phy->base = pdev->base;
974
975 if (irq) {
976 ret = devm_request_irq(pdev->dev, irq, mmp_pdma_chan_handler,
977 IRQF_SHARED, "pdma", phy);
978 if (ret) {
979 dev_err(pdev->dev, "channel request irq fail!\n");
980 return ret;
981 }
982 }
983
984 spin_lock_init(&chan->desc_lock);
985 chan->dev = pdev->dev;
986 chan->chan.device = &pdev->device;
987 tasklet_setup(&chan->tasklet, dma_do_tasklet);
988 INIT_LIST_HEAD(&chan->chain_pending);
989 INIT_LIST_HEAD(&chan->chain_running);
990
991 /* register virt channel to dma engine */
992 list_add_tail(&chan->chan.device_node, &pdev->device.channels);
993
994 return 0;
995}
996
997static const struct of_device_id mmp_pdma_dt_ids[] = {
998 { .compatible = "marvell,pdma-1.0", },
999 {}
1000};
1001MODULE_DEVICE_TABLE(of, mmp_pdma_dt_ids);
1002
1003static struct dma_chan *mmp_pdma_dma_xlate(struct of_phandle_args *dma_spec,
1004 struct of_dma *ofdma)
1005{
1006 struct mmp_pdma_device *d = ofdma->of_dma_data;
1007 struct dma_chan *chan;
1008
1009 chan = dma_get_any_slave_channel(&d->device);
1010 if (!chan)
1011 return NULL;
1012
1013 to_mmp_pdma_chan(chan)->drcmr = dma_spec->args[0];
1014
1015 return chan;
1016}
1017
1018static int mmp_pdma_probe(struct platform_device *op)
1019{
1020 struct mmp_pdma_device *pdev;
1021 struct mmp_dma_platdata *pdata = dev_get_platdata(&op->dev);
1022 int i, ret, irq = 0;
1023 int dma_channels = 0, irq_num = 0;
1024 const enum dma_slave_buswidth widths =
1025 DMA_SLAVE_BUSWIDTH_1_BYTE | DMA_SLAVE_BUSWIDTH_2_BYTES |
1026 DMA_SLAVE_BUSWIDTH_4_BYTES;
1027
1028 pdev = devm_kzalloc(&op->dev, sizeof(*pdev), GFP_KERNEL);
1029 if (!pdev)
1030 return -ENOMEM;
1031
1032 pdev->dev = &op->dev;
1033
1034 spin_lock_init(&pdev->phy_lock);
1035
1036 pdev->base = devm_platform_ioremap_resource(op, 0);
1037 if (IS_ERR(pdev->base))
1038 return PTR_ERR(pdev->base);
1039
1040 if (pdev->dev->of_node) {
1041 /* Parse new and deprecated dma-channels properties */
1042 if (of_property_read_u32(pdev->dev->of_node, "dma-channels",
1043 &dma_channels))
1044 of_property_read_u32(pdev->dev->of_node, "#dma-channels",
1045 &dma_channels);
1046 } else if (pdata && pdata->dma_channels) {
1047 dma_channels = pdata->dma_channels;
1048 } else {
1049 dma_channels = 32; /* default 32 channel */
1050 }
1051 pdev->dma_channels = dma_channels;
1052
1053 for (i = 0; i < dma_channels; i++) {
1054 if (platform_get_irq_optional(op, i) > 0)
1055 irq_num++;
1056 }
1057
1058 pdev->phy = devm_kcalloc(pdev->dev, dma_channels, sizeof(*pdev->phy),
1059 GFP_KERNEL);
1060 if (pdev->phy == NULL)
1061 return -ENOMEM;
1062
1063 INIT_LIST_HEAD(&pdev->device.channels);
1064
1065 if (irq_num != dma_channels) {
1066 /* all chan share one irq, demux inside */
1067 irq = platform_get_irq(op, 0);
1068 ret = devm_request_irq(pdev->dev, irq, mmp_pdma_int_handler,
1069 IRQF_SHARED, "pdma", pdev);
1070 if (ret)
1071 return ret;
1072 }
1073
1074 for (i = 0; i < dma_channels; i++) {
1075 irq = (irq_num != dma_channels) ? 0 : platform_get_irq(op, i);
1076 ret = mmp_pdma_chan_init(pdev, i, irq);
1077 if (ret)
1078 return ret;
1079 }
1080
1081 dma_cap_set(DMA_SLAVE, pdev->device.cap_mask);
1082 dma_cap_set(DMA_MEMCPY, pdev->device.cap_mask);
1083 dma_cap_set(DMA_CYCLIC, pdev->device.cap_mask);
1084 dma_cap_set(DMA_PRIVATE, pdev->device.cap_mask);
1085 pdev->device.dev = &op->dev;
1086 pdev->device.device_alloc_chan_resources = mmp_pdma_alloc_chan_resources;
1087 pdev->device.device_free_chan_resources = mmp_pdma_free_chan_resources;
1088 pdev->device.device_tx_status = mmp_pdma_tx_status;
1089 pdev->device.device_prep_dma_memcpy = mmp_pdma_prep_memcpy;
1090 pdev->device.device_prep_slave_sg = mmp_pdma_prep_slave_sg;
1091 pdev->device.device_prep_dma_cyclic = mmp_pdma_prep_dma_cyclic;
1092 pdev->device.device_issue_pending = mmp_pdma_issue_pending;
1093 pdev->device.device_config = mmp_pdma_config;
1094 pdev->device.device_terminate_all = mmp_pdma_terminate_all;
1095 pdev->device.copy_align = DMAENGINE_ALIGN_8_BYTES;
1096 pdev->device.src_addr_widths = widths;
1097 pdev->device.dst_addr_widths = widths;
1098 pdev->device.directions = BIT(DMA_MEM_TO_DEV) | BIT(DMA_DEV_TO_MEM);
1099 pdev->device.residue_granularity = DMA_RESIDUE_GRANULARITY_DESCRIPTOR;
1100
1101 if (pdev->dev->coherent_dma_mask)
1102 dma_set_mask(pdev->dev, pdev->dev->coherent_dma_mask);
1103 else
1104 dma_set_mask(pdev->dev, DMA_BIT_MASK(64));
1105
1106 ret = dma_async_device_register(&pdev->device);
1107 if (ret) {
1108 dev_err(pdev->device.dev, "unable to register\n");
1109 return ret;
1110 }
1111
1112 if (op->dev.of_node) {
1113 /* Device-tree DMA controller registration */
1114 ret = of_dma_controller_register(op->dev.of_node,
1115 mmp_pdma_dma_xlate, pdev);
1116 if (ret < 0) {
1117 dev_err(&op->dev, "of_dma_controller_register failed\n");
1118 dma_async_device_unregister(&pdev->device);
1119 return ret;
1120 }
1121 }
1122
1123 platform_set_drvdata(op, pdev);
1124 dev_info(pdev->device.dev, "initialized %d channels\n", dma_channels);
1125 return 0;
1126}
1127
1128static const struct platform_device_id mmp_pdma_id_table[] = {
1129 { "mmp-pdma", },
1130 { },
1131};
1132
1133static struct platform_driver mmp_pdma_driver = {
1134 .driver = {
1135 .name = "mmp-pdma",
1136 .of_match_table = mmp_pdma_dt_ids,
1137 },
1138 .id_table = mmp_pdma_id_table,
1139 .probe = mmp_pdma_probe,
1140 .remove_new = mmp_pdma_remove,
1141};
1142
1143module_platform_driver(mmp_pdma_driver);
1144
1145MODULE_DESCRIPTION("MARVELL MMP Peripheral DMA Driver");
1146MODULE_AUTHOR("Marvell International Ltd.");
1147MODULE_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#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
949 for (i = 0; i < pdev->dma_channels; i++) {
950 if (platform_get_irq(op, i) > 0)
951 irq_num++;
952 }
953
954 if (irq_num != pdev->dma_channels) {
955 irq = platform_get_irq(op, 0);
956 devm_free_irq(&op->dev, irq, pdev);
957 } else {
958 for (i = 0; i < pdev->dma_channels; i++) {
959 phy = &pdev->phy[i];
960 irq = platform_get_irq(op, i);
961 devm_free_irq(&op->dev, irq, phy);
962 }
963 }
964
965 dma_async_device_unregister(&pdev->device);
966 return 0;
967}
968
969static int mmp_pdma_chan_init(struct mmp_pdma_device *pdev, int idx, int irq)
970{
971 struct mmp_pdma_phy *phy = &pdev->phy[idx];
972 struct mmp_pdma_chan *chan;
973 int ret;
974
975 chan = devm_kzalloc(pdev->dev, sizeof(*chan), GFP_KERNEL);
976 if (chan == NULL)
977 return -ENOMEM;
978
979 phy->idx = idx;
980 phy->base = pdev->base;
981
982 if (irq) {
983 ret = devm_request_irq(pdev->dev, irq, mmp_pdma_chan_handler,
984 IRQF_SHARED, "pdma", phy);
985 if (ret) {
986 dev_err(pdev->dev, "channel request irq fail!\n");
987 return ret;
988 }
989 }
990
991 spin_lock_init(&chan->desc_lock);
992 chan->dev = pdev->dev;
993 chan->chan.device = &pdev->device;
994 tasklet_init(&chan->tasklet, dma_do_tasklet, (unsigned long)chan);
995 INIT_LIST_HEAD(&chan->chain_pending);
996 INIT_LIST_HEAD(&chan->chain_running);
997
998 /* register virt channel to dma engine */
999 list_add_tail(&chan->chan.device_node, &pdev->device.channels);
1000
1001 return 0;
1002}
1003
1004static const struct of_device_id mmp_pdma_dt_ids[] = {
1005 { .compatible = "marvell,pdma-1.0", },
1006 {}
1007};
1008MODULE_DEVICE_TABLE(of, mmp_pdma_dt_ids);
1009
1010static struct dma_chan *mmp_pdma_dma_xlate(struct of_phandle_args *dma_spec,
1011 struct of_dma *ofdma)
1012{
1013 struct mmp_pdma_device *d = ofdma->of_dma_data;
1014 struct dma_chan *chan;
1015
1016 chan = dma_get_any_slave_channel(&d->device);
1017 if (!chan)
1018 return NULL;
1019
1020 to_mmp_pdma_chan(chan)->drcmr = dma_spec->args[0];
1021
1022 return chan;
1023}
1024
1025static int mmp_pdma_probe(struct platform_device *op)
1026{
1027 struct mmp_pdma_device *pdev;
1028 const struct of_device_id *of_id;
1029 struct mmp_dma_platdata *pdata = dev_get_platdata(&op->dev);
1030 struct resource *iores;
1031 int i, ret, irq = 0;
1032 int dma_channels = 0, irq_num = 0;
1033 const enum dma_slave_buswidth widths =
1034 DMA_SLAVE_BUSWIDTH_1_BYTE | DMA_SLAVE_BUSWIDTH_2_BYTES |
1035 DMA_SLAVE_BUSWIDTH_4_BYTES;
1036
1037 pdev = devm_kzalloc(&op->dev, sizeof(*pdev), GFP_KERNEL);
1038 if (!pdev)
1039 return -ENOMEM;
1040
1041 pdev->dev = &op->dev;
1042
1043 spin_lock_init(&pdev->phy_lock);
1044
1045 iores = platform_get_resource(op, IORESOURCE_MEM, 0);
1046 pdev->base = devm_ioremap_resource(pdev->dev, iores);
1047 if (IS_ERR(pdev->base))
1048 return PTR_ERR(pdev->base);
1049
1050 of_id = of_match_device(mmp_pdma_dt_ids, pdev->dev);
1051 if (of_id)
1052 of_property_read_u32(pdev->dev->of_node, "#dma-channels",
1053 &dma_channels);
1054 else if (pdata && pdata->dma_channels)
1055 dma_channels = pdata->dma_channels;
1056 else
1057 dma_channels = 32; /* default 32 channel */
1058 pdev->dma_channels = dma_channels;
1059
1060 for (i = 0; i < dma_channels; i++) {
1061 if (platform_get_irq(op, i) > 0)
1062 irq_num++;
1063 }
1064
1065 pdev->phy = devm_kcalloc(pdev->dev, dma_channels, sizeof(*pdev->phy),
1066 GFP_KERNEL);
1067 if (pdev->phy == NULL)
1068 return -ENOMEM;
1069
1070 INIT_LIST_HEAD(&pdev->device.channels);
1071
1072 if (irq_num != dma_channels) {
1073 /* all chan share one irq, demux inside */
1074 irq = platform_get_irq(op, 0);
1075 ret = devm_request_irq(pdev->dev, irq, mmp_pdma_int_handler,
1076 IRQF_SHARED, "pdma", pdev);
1077 if (ret)
1078 return ret;
1079 }
1080
1081 for (i = 0; i < dma_channels; i++) {
1082 irq = (irq_num != dma_channels) ? 0 : platform_get_irq(op, i);
1083 ret = mmp_pdma_chan_init(pdev, i, irq);
1084 if (ret)
1085 return ret;
1086 }
1087
1088 dma_cap_set(DMA_SLAVE, pdev->device.cap_mask);
1089 dma_cap_set(DMA_MEMCPY, pdev->device.cap_mask);
1090 dma_cap_set(DMA_CYCLIC, pdev->device.cap_mask);
1091 dma_cap_set(DMA_PRIVATE, pdev->device.cap_mask);
1092 pdev->device.dev = &op->dev;
1093 pdev->device.device_alloc_chan_resources = mmp_pdma_alloc_chan_resources;
1094 pdev->device.device_free_chan_resources = mmp_pdma_free_chan_resources;
1095 pdev->device.device_tx_status = mmp_pdma_tx_status;
1096 pdev->device.device_prep_dma_memcpy = mmp_pdma_prep_memcpy;
1097 pdev->device.device_prep_slave_sg = mmp_pdma_prep_slave_sg;
1098 pdev->device.device_prep_dma_cyclic = mmp_pdma_prep_dma_cyclic;
1099 pdev->device.device_issue_pending = mmp_pdma_issue_pending;
1100 pdev->device.device_config = mmp_pdma_config;
1101 pdev->device.device_terminate_all = mmp_pdma_terminate_all;
1102 pdev->device.copy_align = DMAENGINE_ALIGN_8_BYTES;
1103 pdev->device.src_addr_widths = widths;
1104 pdev->device.dst_addr_widths = widths;
1105 pdev->device.directions = BIT(DMA_MEM_TO_DEV) | BIT(DMA_DEV_TO_MEM);
1106 pdev->device.residue_granularity = DMA_RESIDUE_GRANULARITY_DESCRIPTOR;
1107
1108 if (pdev->dev->coherent_dma_mask)
1109 dma_set_mask(pdev->dev, pdev->dev->coherent_dma_mask);
1110 else
1111 dma_set_mask(pdev->dev, DMA_BIT_MASK(64));
1112
1113 ret = dma_async_device_register(&pdev->device);
1114 if (ret) {
1115 dev_err(pdev->device.dev, "unable to register\n");
1116 return ret;
1117 }
1118
1119 if (op->dev.of_node) {
1120 /* Device-tree DMA controller registration */
1121 ret = of_dma_controller_register(op->dev.of_node,
1122 mmp_pdma_dma_xlate, pdev);
1123 if (ret < 0) {
1124 dev_err(&op->dev, "of_dma_controller_register failed\n");
1125 return ret;
1126 }
1127 }
1128
1129 platform_set_drvdata(op, pdev);
1130 dev_info(pdev->device.dev, "initialized %d channels\n", dma_channels);
1131 return 0;
1132}
1133
1134static const struct platform_device_id mmp_pdma_id_table[] = {
1135 { "mmp-pdma", },
1136 { },
1137};
1138
1139static struct platform_driver mmp_pdma_driver = {
1140 .driver = {
1141 .name = "mmp-pdma",
1142 .of_match_table = mmp_pdma_dt_ids,
1143 },
1144 .id_table = mmp_pdma_id_table,
1145 .probe = mmp_pdma_probe,
1146 .remove = mmp_pdma_remove,
1147};
1148
1149bool mmp_pdma_filter_fn(struct dma_chan *chan, void *param)
1150{
1151 struct mmp_pdma_chan *c = to_mmp_pdma_chan(chan);
1152
1153 if (chan->device->dev->driver != &mmp_pdma_driver.driver)
1154 return false;
1155
1156 c->drcmr = *(unsigned int *)param;
1157
1158 return true;
1159}
1160EXPORT_SYMBOL_GPL(mmp_pdma_filter_fn);
1161
1162module_platform_driver(mmp_pdma_driver);
1163
1164MODULE_DESCRIPTION("MARVELL MMP Peripheral DMA Driver");
1165MODULE_AUTHOR("Marvell International Ltd.");
1166MODULE_LICENSE("GPL v2");