2 * Copyright 2012 Marvell International Ltd.
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
9 #include <linux/module.h>
10 #include <linux/init.h>
11 #include <linux/types.h>
12 #include <linux/interrupt.h>
13 #include <linux/dma-mapping.h>
14 #include <linux/slab.h>
15 #include <linux/dmaengine.h>
16 #include <linux/platform_device.h>
17 #include <linux/device.h>
18 #include <linux/platform_data/mmp_dma.h>
19 #include <linux/dmapool.h>
20 #include <linux/of_device.h>
23 #include "dmaengine.h"
33 #define DCSR_RUN (1 << 31) /* Run Bit (read / write) */
34 #define DCSR_NODESC (1 << 30) /* No-Descriptor Fetch (read / write) */
35 #define DCSR_STOPIRQEN (1 << 29) /* Stop Interrupt Enable (read / write) */
36 #define DCSR_REQPEND (1 << 8) /* Request Pending (read-only) */
37 #define DCSR_STOPSTATE (1 << 3) /* Stop State (read-only) */
38 #define DCSR_ENDINTR (1 << 2) /* End Interrupt (read / write) */
39 #define DCSR_STARTINTR (1 << 1) /* Start Interrupt (read / write) */
40 #define DCSR_BUSERR (1 << 0) /* Bus Error Interrupt (read / write) */
42 #define DCSR_EORIRQEN (1 << 28) /* End of Receive Interrupt Enable (R/W) */
43 #define DCSR_EORJMPEN (1 << 27) /* Jump to next descriptor on EOR */
44 #define DCSR_EORSTOPEN (1 << 26) /* STOP on an EOR */
45 #define DCSR_SETCMPST (1 << 25) /* Set Descriptor Compare Status */
46 #define DCSR_CLRCMPST (1 << 24) /* Clear Descriptor Compare Status */
47 #define DCSR_CMPST (1 << 10) /* The Descriptor Compare Status */
48 #define DCSR_EORINTR (1 << 9) /* The end of Receive */
50 #define DRCMR_MAPVLD (1 << 7) /* Map Valid (read / write) */
51 #define DRCMR_CHLNUM 0x1f /* mask for Channel Number (read / write) */
53 #define DDADR_DESCADDR 0xfffffff0 /* Address of next descriptor (mask) */
54 #define DDADR_STOP (1 << 0) /* Stop (read / write) */
56 #define DCMD_INCSRCADDR (1 << 31) /* Source Address Increment Setting. */
57 #define DCMD_INCTRGADDR (1 << 30) /* Target Address Increment Setting. */
58 #define DCMD_FLOWSRC (1 << 29) /* Flow Control by the source. */
59 #define DCMD_FLOWTRG (1 << 28) /* Flow Control by the target. */
60 #define DCMD_STARTIRQEN (1 << 22) /* Start Interrupt Enable */
61 #define DCMD_ENDIRQEN (1 << 21) /* End Interrupt Enable */
62 #define DCMD_ENDIAN (1 << 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) */
71 #define PDMA_ALIGNMENT 3
72 #define PDMA_MAX_DESC_BYTES 0x1000
74 struct 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 */
81 struct 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;
90 struct mmp_pdma_chan {
93 struct dma_async_tx_descriptor desc;
94 struct mmp_pdma_phy *phy;
95 enum dma_transfer_direction dir;
97 /* channel's basic info */
98 struct tasklet_struct tasklet;
104 spinlock_t desc_lock; /* Descriptor list lock */
105 struct list_head chain_pending; /* Link descriptors queue for pending */
106 struct list_head chain_running; /* Link descriptors queue for running */
107 bool idle; /* channel statue machine */
109 struct dma_pool *desc_pool; /* Descriptors pool */
112 struct mmp_pdma_phy {
115 struct mmp_pdma_chan *vchan;
118 struct mmp_pdma_device {
122 struct dma_device device;
123 struct mmp_pdma_phy *phy;
124 spinlock_t phy_lock; /* protect alloc/free phy channels */
127 #define tx_to_mmp_pdma_desc(tx) container_of(tx, struct mmp_pdma_desc_sw, async_tx)
128 #define to_mmp_pdma_desc(lh) container_of(lh, struct mmp_pdma_desc_sw, node)
129 #define to_mmp_pdma_chan(dchan) container_of(dchan, struct mmp_pdma_chan, chan)
130 #define to_mmp_pdma_dev(dmadev) container_of(dmadev, struct mmp_pdma_device, device)
132 static void set_desc(struct mmp_pdma_phy *phy, dma_addr_t addr)
134 u32 reg = (phy->idx << 4) + DDADR;
136 writel(addr, phy->base + reg);
139 static void enable_chan(struct mmp_pdma_phy *phy)
146 reg = phy->vchan->drcmr;
147 reg = (((reg) < 64) ? 0x0100 : 0x1100) + (((reg) & 0x3f) << 2);
148 writel(DRCMR_MAPVLD | phy->idx, phy->base + reg);
150 reg = (phy->idx << 2) + DCSR;
151 writel(readl(phy->base + reg) | DCSR_RUN,
155 static void disable_chan(struct mmp_pdma_phy *phy)
160 reg = (phy->idx << 2) + DCSR;
161 writel(readl(phy->base + reg) & ~DCSR_RUN,
166 static int clear_chan_irq(struct mmp_pdma_phy *phy)
169 u32 dint = readl(phy->base + DINT);
170 u32 reg = (phy->idx << 2) + DCSR;
172 if (dint & BIT(phy->idx)) {
174 dcsr = readl(phy->base + reg);
175 writel(dcsr, phy->base + reg);
176 if ((dcsr & DCSR_BUSERR) && (phy->vchan))
177 dev_warn(phy->vchan->dev, "DCSR_BUSERR\n");
183 static irqreturn_t mmp_pdma_chan_handler(int irq, void *dev_id)
185 struct mmp_pdma_phy *phy = dev_id;
187 if (clear_chan_irq(phy) == 0) {
188 tasklet_schedule(&phy->vchan->tasklet);
194 static irqreturn_t mmp_pdma_int_handler(int irq, void *dev_id)
196 struct mmp_pdma_device *pdev = dev_id;
197 struct mmp_pdma_phy *phy;
198 u32 dint = readl(pdev->base + DINT);
206 ret = mmp_pdma_chan_handler(irq, phy);
207 if (ret == IRQ_HANDLED)
217 /* lookup free phy channel as descending priority */
218 static struct mmp_pdma_phy *lookup_phy(struct mmp_pdma_chan *pchan)
221 struct mmp_pdma_device *pdev = to_mmp_pdma_dev(pchan->chan.device);
222 struct mmp_pdma_phy *phy;
226 * dma channel priorities
227 * ch 0 - 3, 16 - 19 <--> (0)
228 * ch 4 - 7, 20 - 23 <--> (1)
229 * ch 8 - 11, 24 - 27 <--> (2)
230 * ch 12 - 15, 28 - 31 <--> (3)
233 spin_lock_irqsave(&pdev->phy_lock, flags);
234 for (prio = 0; prio <= (((pdev->dma_channels - 1) & 0xf) >> 2); prio++) {
235 for (i = 0; i < pdev->dma_channels; i++) {
236 if (prio != ((i & 0xf) >> 2))
241 spin_unlock_irqrestore(&pdev->phy_lock, flags);
247 spin_unlock_irqrestore(&pdev->phy_lock, flags);
251 static void mmp_pdma_free_phy(struct mmp_pdma_chan *pchan)
253 struct mmp_pdma_device *pdev = to_mmp_pdma_dev(pchan->chan.device);
260 /* clear the channel mapping in DRCMR */
261 reg = pchan->phy->vchan->drcmr;
262 reg = ((reg < 64) ? 0x0100 : 0x1100) + ((reg & 0x3f) << 2);
263 writel(0, pchan->phy->base + reg);
265 spin_lock_irqsave(&pdev->phy_lock, flags);
266 pchan->phy->vchan = NULL;
268 spin_unlock_irqrestore(&pdev->phy_lock, flags);
271 /* desc->tx_list ==> pending list */
272 static void append_pending_queue(struct mmp_pdma_chan *chan,
273 struct mmp_pdma_desc_sw *desc)
275 struct mmp_pdma_desc_sw *tail =
276 to_mmp_pdma_desc(chan->chain_pending.prev);
278 if (list_empty(&chan->chain_pending))
281 /* one irq per queue, even appended */
282 tail->desc.ddadr = desc->async_tx.phys;
283 tail->desc.dcmd &= ~DCMD_ENDIRQEN;
285 /* softly link to pending list */
287 list_splice_tail_init(&desc->tx_list, &chan->chain_pending);
291 * start_pending_queue - transfer any pending transactions
292 * pending list ==> running list
294 static void start_pending_queue(struct mmp_pdma_chan *chan)
296 struct mmp_pdma_desc_sw *desc;
298 /* still in running, irq will start the pending list */
300 dev_dbg(chan->dev, "DMA controller still busy\n");
304 if (list_empty(&chan->chain_pending)) {
305 /* chance to re-fetch phy channel with higher prio */
306 mmp_pdma_free_phy(chan);
307 dev_dbg(chan->dev, "no pending list\n");
312 chan->phy = lookup_phy(chan);
314 dev_dbg(chan->dev, "no free dma channel\n");
321 * reintilize pending list
323 desc = list_first_entry(&chan->chain_pending,
324 struct mmp_pdma_desc_sw, node);
325 list_splice_tail_init(&chan->chain_pending, &chan->chain_running);
328 * Program the descriptor's address into the DMA controller,
329 * then start the DMA transaction
331 set_desc(chan->phy, desc->async_tx.phys);
332 enable_chan(chan->phy);
337 /* desc->tx_list ==> pending list */
338 static dma_cookie_t mmp_pdma_tx_submit(struct dma_async_tx_descriptor *tx)
340 struct mmp_pdma_chan *chan = to_mmp_pdma_chan(tx->chan);
341 struct mmp_pdma_desc_sw *desc = tx_to_mmp_pdma_desc(tx);
342 struct mmp_pdma_desc_sw *child;
344 dma_cookie_t cookie = -EBUSY;
346 spin_lock_irqsave(&chan->desc_lock, flags);
348 list_for_each_entry(child, &desc->tx_list, node) {
349 cookie = dma_cookie_assign(&child->async_tx);
352 append_pending_queue(chan, desc);
354 spin_unlock_irqrestore(&chan->desc_lock, flags);
359 static struct mmp_pdma_desc_sw *
360 mmp_pdma_alloc_descriptor(struct mmp_pdma_chan *chan)
362 struct mmp_pdma_desc_sw *desc;
365 desc = dma_pool_alloc(chan->desc_pool, GFP_ATOMIC, &pdesc);
367 dev_err(chan->dev, "out of memory for link descriptor\n");
371 memset(desc, 0, sizeof(*desc));
372 INIT_LIST_HEAD(&desc->tx_list);
373 dma_async_tx_descriptor_init(&desc->async_tx, &chan->chan);
374 /* each desc has submit */
375 desc->async_tx.tx_submit = mmp_pdma_tx_submit;
376 desc->async_tx.phys = pdesc;
382 * mmp_pdma_alloc_chan_resources - Allocate resources for DMA channel.
384 * This function will create a dma pool for descriptor allocation.
385 * Request irq only when channel is requested
386 * Return - The number of allocated descriptors.
389 static int mmp_pdma_alloc_chan_resources(struct dma_chan *dchan)
391 struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan);
397 dma_pool_create(dev_name(&dchan->dev->device), chan->dev,
398 sizeof(struct mmp_pdma_desc_sw),
399 __alignof__(struct mmp_pdma_desc_sw), 0);
400 if (!chan->desc_pool) {
401 dev_err(chan->dev, "unable to allocate descriptor pool\n");
404 mmp_pdma_free_phy(chan);
410 static void mmp_pdma_free_desc_list(struct mmp_pdma_chan *chan,
411 struct list_head *list)
413 struct mmp_pdma_desc_sw *desc, *_desc;
415 list_for_each_entry_safe(desc, _desc, list, node) {
416 list_del(&desc->node);
417 dma_pool_free(chan->desc_pool, desc, desc->async_tx.phys);
421 static void mmp_pdma_free_chan_resources(struct dma_chan *dchan)
423 struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan);
426 spin_lock_irqsave(&chan->desc_lock, flags);
427 mmp_pdma_free_desc_list(chan, &chan->chain_pending);
428 mmp_pdma_free_desc_list(chan, &chan->chain_running);
429 spin_unlock_irqrestore(&chan->desc_lock, flags);
431 dma_pool_destroy(chan->desc_pool);
432 chan->desc_pool = NULL;
435 mmp_pdma_free_phy(chan);
439 static struct dma_async_tx_descriptor *
440 mmp_pdma_prep_memcpy(struct dma_chan *dchan,
441 dma_addr_t dma_dst, dma_addr_t dma_src,
442 size_t len, unsigned long flags)
444 struct mmp_pdma_chan *chan;
445 struct mmp_pdma_desc_sw *first = NULL, *prev = NULL, *new;
454 chan = to_mmp_pdma_chan(dchan);
457 chan->dir = DMA_MEM_TO_MEM;
458 chan->dcmd = DCMD_INCTRGADDR | DCMD_INCSRCADDR;
459 chan->dcmd |= DCMD_BURST32;
463 /* Allocate the link descriptor from DMA pool */
464 new = mmp_pdma_alloc_descriptor(chan);
466 dev_err(chan->dev, "no memory for desc\n");
470 copy = min_t(size_t, len, PDMA_MAX_DESC_BYTES);
472 new->desc.dcmd = chan->dcmd | (DCMD_LENGTH & copy);
473 new->desc.dsadr = dma_src;
474 new->desc.dtadr = dma_dst;
479 prev->desc.ddadr = new->async_tx.phys;
481 new->async_tx.cookie = 0;
482 async_tx_ack(&new->async_tx);
487 if (chan->dir == DMA_MEM_TO_DEV) {
489 } else if (chan->dir == DMA_DEV_TO_MEM) {
491 } else if (chan->dir == DMA_MEM_TO_MEM) {
496 /* Insert the link descriptor to the LD ring */
497 list_add_tail(&new->node, &first->tx_list);
500 first->async_tx.flags = flags; /* client is in control of this ack */
501 first->async_tx.cookie = -EBUSY;
503 /* last desc and fire IRQ */
504 new->desc.ddadr = DDADR_STOP;
505 new->desc.dcmd |= DCMD_ENDIRQEN;
507 return &first->async_tx;
511 mmp_pdma_free_desc_list(chan, &first->tx_list);
515 static struct dma_async_tx_descriptor *
516 mmp_pdma_prep_slave_sg(struct dma_chan *dchan, struct scatterlist *sgl,
517 unsigned int sg_len, enum dma_transfer_direction dir,
518 unsigned long flags, void *context)
520 struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan);
521 struct mmp_pdma_desc_sw *first = NULL, *prev = NULL, *new = NULL;
523 struct scatterlist *sg;
527 if ((sgl == NULL) || (sg_len == 0))
530 for_each_sg(sgl, sg, sg_len, i) {
531 addr = sg_dma_address(sg);
532 avail = sg_dma_len(sgl);
535 len = min_t(size_t, avail, PDMA_MAX_DESC_BYTES);
537 /* allocate and populate the descriptor */
538 new = mmp_pdma_alloc_descriptor(chan);
540 dev_err(chan->dev, "no memory for desc\n");
544 new->desc.dcmd = chan->dcmd | (DCMD_LENGTH & len);
545 if (dir == DMA_MEM_TO_DEV) {
546 new->desc.dsadr = addr;
547 new->desc.dtadr = chan->dev_addr;
549 new->desc.dsadr = chan->dev_addr;
550 new->desc.dtadr = addr;
556 prev->desc.ddadr = new->async_tx.phys;
558 new->async_tx.cookie = 0;
559 async_tx_ack(&new->async_tx);
562 /* Insert the link descriptor to the LD ring */
563 list_add_tail(&new->node, &first->tx_list);
565 /* update metadata */
571 first->async_tx.cookie = -EBUSY;
572 first->async_tx.flags = flags;
574 /* last desc and fire IRQ */
575 new->desc.ddadr = DDADR_STOP;
576 new->desc.dcmd |= DCMD_ENDIRQEN;
578 return &first->async_tx;
582 mmp_pdma_free_desc_list(chan, &first->tx_list);
586 static int mmp_pdma_control(struct dma_chan *dchan, enum dma_ctrl_cmd cmd,
589 struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan);
590 struct dma_slave_config *cfg = (void *)arg;
593 u32 maxburst = 0, addr = 0;
594 enum dma_slave_buswidth width = DMA_SLAVE_BUSWIDTH_UNDEFINED;
600 case DMA_TERMINATE_ALL:
601 disable_chan(chan->phy);
602 mmp_pdma_free_phy(chan);
603 spin_lock_irqsave(&chan->desc_lock, flags);
604 mmp_pdma_free_desc_list(chan, &chan->chain_pending);
605 mmp_pdma_free_desc_list(chan, &chan->chain_running);
606 spin_unlock_irqrestore(&chan->desc_lock, flags);
609 case DMA_SLAVE_CONFIG:
610 if (cfg->direction == DMA_DEV_TO_MEM) {
611 chan->dcmd = DCMD_INCTRGADDR | DCMD_FLOWSRC;
612 maxburst = cfg->src_maxburst;
613 width = cfg->src_addr_width;
614 addr = cfg->src_addr;
615 } else if (cfg->direction == DMA_MEM_TO_DEV) {
616 chan->dcmd = DCMD_INCSRCADDR | DCMD_FLOWTRG;
617 maxburst = cfg->dst_maxburst;
618 width = cfg->dst_addr_width;
619 addr = cfg->dst_addr;
622 if (width == DMA_SLAVE_BUSWIDTH_1_BYTE)
623 chan->dcmd |= DCMD_WIDTH1;
624 else if (width == DMA_SLAVE_BUSWIDTH_2_BYTES)
625 chan->dcmd |= DCMD_WIDTH2;
626 else if (width == DMA_SLAVE_BUSWIDTH_4_BYTES)
627 chan->dcmd |= DCMD_WIDTH4;
630 chan->dcmd |= DCMD_BURST8;
631 else if (maxburst == 16)
632 chan->dcmd |= DCMD_BURST16;
633 else if (maxburst == 32)
634 chan->dcmd |= DCMD_BURST32;
636 chan->dir = cfg->direction;
637 chan->drcmr = cfg->slave_id;
638 chan->dev_addr = addr;
647 static enum dma_status mmp_pdma_tx_status(struct dma_chan *dchan,
648 dma_cookie_t cookie, struct dma_tx_state *txstate)
650 return dma_cookie_status(dchan, cookie, txstate);
654 * mmp_pdma_issue_pending - Issue the DMA start command
655 * pending list ==> running list
657 static void mmp_pdma_issue_pending(struct dma_chan *dchan)
659 struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan);
662 spin_lock_irqsave(&chan->desc_lock, flags);
663 start_pending_queue(chan);
664 spin_unlock_irqrestore(&chan->desc_lock, flags);
672 static void dma_do_tasklet(unsigned long data)
674 struct mmp_pdma_chan *chan = (struct mmp_pdma_chan *)data;
675 struct mmp_pdma_desc_sw *desc, *_desc;
676 LIST_HEAD(chain_cleanup);
679 /* submit pending list; callback for each desc; free desc */
681 spin_lock_irqsave(&chan->desc_lock, flags);
683 /* update the cookie if we have some descriptors to cleanup */
684 if (!list_empty(&chan->chain_running)) {
687 desc = to_mmp_pdma_desc(chan->chain_running.prev);
688 cookie = desc->async_tx.cookie;
689 dma_cookie_complete(&desc->async_tx);
691 dev_dbg(chan->dev, "completed_cookie=%d\n", cookie);
695 * move the descriptors to a temporary list so we can drop the lock
696 * during the entire cleanup operation
698 list_splice_tail_init(&chan->chain_running, &chain_cleanup);
700 /* the hardware is now idle and ready for more */
703 /* Start any pending transactions automatically */
704 start_pending_queue(chan);
705 spin_unlock_irqrestore(&chan->desc_lock, flags);
707 /* Run the callback for each descriptor, in order */
708 list_for_each_entry_safe(desc, _desc, &chain_cleanup, node) {
709 struct dma_async_tx_descriptor *txd = &desc->async_tx;
711 /* Remove from the list of transactions */
712 list_del(&desc->node);
713 /* Run the link descriptor callback function */
715 txd->callback(txd->callback_param);
717 dma_pool_free(chan->desc_pool, desc, txd->phys);
721 static int mmp_pdma_remove(struct platform_device *op)
723 struct mmp_pdma_device *pdev = platform_get_drvdata(op);
725 dma_async_device_unregister(&pdev->device);
729 static int mmp_pdma_chan_init(struct mmp_pdma_device *pdev,
732 struct mmp_pdma_phy *phy = &pdev->phy[idx];
733 struct mmp_pdma_chan *chan;
736 chan = devm_kzalloc(pdev->dev,
737 sizeof(struct mmp_pdma_chan), GFP_KERNEL);
742 phy->base = pdev->base;
745 ret = devm_request_irq(pdev->dev, irq,
746 mmp_pdma_chan_handler, IRQF_DISABLED, "pdma", phy);
748 dev_err(pdev->dev, "channel request irq fail!\n");
753 spin_lock_init(&chan->desc_lock);
754 chan->dev = pdev->dev;
755 chan->chan.device = &pdev->device;
756 tasklet_init(&chan->tasklet, dma_do_tasklet, (unsigned long)chan);
757 INIT_LIST_HEAD(&chan->chain_pending);
758 INIT_LIST_HEAD(&chan->chain_running);
760 /* register virt channel to dma engine */
761 list_add_tail(&chan->chan.device_node,
762 &pdev->device.channels);
767 static struct of_device_id mmp_pdma_dt_ids[] = {
768 { .compatible = "marvell,pdma-1.0", },
771 MODULE_DEVICE_TABLE(of, mmp_pdma_dt_ids);
773 static int mmp_pdma_probe(struct platform_device *op)
775 struct mmp_pdma_device *pdev;
776 const struct of_device_id *of_id;
777 struct mmp_dma_platdata *pdata = dev_get_platdata(&op->dev);
778 struct resource *iores;
780 int dma_channels = 0, irq_num = 0;
782 pdev = devm_kzalloc(&op->dev, sizeof(*pdev), GFP_KERNEL);
785 pdev->dev = &op->dev;
787 spin_lock_init(&pdev->phy_lock);
789 iores = platform_get_resource(op, IORESOURCE_MEM, 0);
793 pdev->base = devm_ioremap_resource(pdev->dev, iores);
794 if (IS_ERR(pdev->base))
795 return PTR_ERR(pdev->base);
797 of_id = of_match_device(mmp_pdma_dt_ids, pdev->dev);
799 of_property_read_u32(pdev->dev->of_node,
800 "#dma-channels", &dma_channels);
801 else if (pdata && pdata->dma_channels)
802 dma_channels = pdata->dma_channels;
804 dma_channels = 32; /* default 32 channel */
805 pdev->dma_channels = dma_channels;
807 for (i = 0; i < dma_channels; i++) {
808 if (platform_get_irq(op, i) > 0)
812 pdev->phy = devm_kzalloc(pdev->dev,
813 dma_channels * sizeof(struct mmp_pdma_chan), GFP_KERNEL);
814 if (pdev->phy == NULL)
817 INIT_LIST_HEAD(&pdev->device.channels);
819 if (irq_num != dma_channels) {
820 /* all chan share one irq, demux inside */
821 irq = platform_get_irq(op, 0);
822 ret = devm_request_irq(pdev->dev, irq,
823 mmp_pdma_int_handler, IRQF_DISABLED, "pdma", pdev);
828 for (i = 0; i < dma_channels; i++) {
829 irq = (irq_num != dma_channels) ? 0 : platform_get_irq(op, i);
830 ret = mmp_pdma_chan_init(pdev, i, irq);
835 dma_cap_set(DMA_SLAVE, pdev->device.cap_mask);
836 dma_cap_set(DMA_MEMCPY, pdev->device.cap_mask);
837 dma_cap_set(DMA_SLAVE, pdev->device.cap_mask);
838 pdev->device.dev = &op->dev;
839 pdev->device.device_alloc_chan_resources = mmp_pdma_alloc_chan_resources;
840 pdev->device.device_free_chan_resources = mmp_pdma_free_chan_resources;
841 pdev->device.device_tx_status = mmp_pdma_tx_status;
842 pdev->device.device_prep_dma_memcpy = mmp_pdma_prep_memcpy;
843 pdev->device.device_prep_slave_sg = mmp_pdma_prep_slave_sg;
844 pdev->device.device_issue_pending = mmp_pdma_issue_pending;
845 pdev->device.device_control = mmp_pdma_control;
846 pdev->device.copy_align = PDMA_ALIGNMENT;
848 if (pdev->dev->coherent_dma_mask)
849 dma_set_mask(pdev->dev, pdev->dev->coherent_dma_mask);
851 dma_set_mask(pdev->dev, DMA_BIT_MASK(64));
853 ret = dma_async_device_register(&pdev->device);
855 dev_err(pdev->device.dev, "unable to register\n");
859 dev_info(pdev->device.dev, "initialized\n");
863 static const struct platform_device_id mmp_pdma_id_table[] = {
868 static struct platform_driver mmp_pdma_driver = {
871 .owner = THIS_MODULE,
872 .of_match_table = mmp_pdma_dt_ids,
874 .id_table = mmp_pdma_id_table,
875 .probe = mmp_pdma_probe,
876 .remove = mmp_pdma_remove,
879 module_platform_driver(mmp_pdma_driver);
881 MODULE_DESCRIPTION("MARVELL MMP Periphera DMA Driver");
882 MODULE_AUTHOR("Marvell International Ltd.");
883 MODULE_LICENSE("GPL v2");