2 * DMA controller driver for CSR SiRFprimaII
4 * Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company.
6 * Licensed under GPLv2 or later.
9 #include <linux/module.h>
10 #include <linux/dmaengine.h>
11 #include <linux/dma-mapping.h>
12 #include <linux/pm_runtime.h>
13 #include <linux/interrupt.h>
15 #include <linux/slab.h>
16 #include <linux/of_irq.h>
17 #include <linux/of_address.h>
18 #include <linux/of_device.h>
19 #include <linux/of_platform.h>
20 #include <linux/clk.h>
21 #include <linux/of_dma.h>
22 #include <linux/sirfsoc_dma.h>
24 #include "dmaengine.h"
26 #define SIRFSOC_DMA_VER_A7V1 1
27 #define SIRFSOC_DMA_VER_A7V2 2
28 #define SIRFSOC_DMA_VER_A6 4
30 #define SIRFSOC_DMA_DESCRIPTORS 16
31 #define SIRFSOC_DMA_CHANNELS 16
32 #define SIRFSOC_DMA_TABLE_NUM 256
34 #define SIRFSOC_DMA_CH_ADDR 0x00
35 #define SIRFSOC_DMA_CH_XLEN 0x04
36 #define SIRFSOC_DMA_CH_YLEN 0x08
37 #define SIRFSOC_DMA_CH_CTRL 0x0C
39 #define SIRFSOC_DMA_WIDTH_0 0x100
40 #define SIRFSOC_DMA_CH_VALID 0x140
41 #define SIRFSOC_DMA_CH_INT 0x144
42 #define SIRFSOC_DMA_INT_EN 0x148
43 #define SIRFSOC_DMA_INT_EN_CLR 0x14C
44 #define SIRFSOC_DMA_CH_LOOP_CTRL 0x150
45 #define SIRFSOC_DMA_CH_LOOP_CTRL_CLR 0x154
46 #define SIRFSOC_DMA_WIDTH_ATLAS7 0x10
47 #define SIRFSOC_DMA_VALID_ATLAS7 0x14
48 #define SIRFSOC_DMA_INT_ATLAS7 0x18
49 #define SIRFSOC_DMA_INT_EN_ATLAS7 0x1c
50 #define SIRFSOC_DMA_LOOP_CTRL_ATLAS7 0x20
51 #define SIRFSOC_DMA_CUR_DATA_ADDR 0x34
52 #define SIRFSOC_DMA_MUL_ATLAS7 0x38
53 #define SIRFSOC_DMA_CH_LOOP_CTRL_ATLAS7 0x158
54 #define SIRFSOC_DMA_CH_LOOP_CTRL_CLR_ATLAS7 0x15C
55 #define SIRFSOC_DMA_IOBG_SCMD_EN 0x800
56 #define SIRFSOC_DMA_EARLY_RESP_SET 0x818
57 #define SIRFSOC_DMA_EARLY_RESP_CLR 0x81C
59 #define SIRFSOC_DMA_MODE_CTRL_BIT 4
60 #define SIRFSOC_DMA_DIR_CTRL_BIT 5
61 #define SIRFSOC_DMA_MODE_CTRL_BIT_ATLAS7 2
62 #define SIRFSOC_DMA_CHAIN_CTRL_BIT_ATLAS7 3
63 #define SIRFSOC_DMA_DIR_CTRL_BIT_ATLAS7 4
64 #define SIRFSOC_DMA_TAB_NUM_ATLAS7 7
65 #define SIRFSOC_DMA_CHAIN_INT_BIT_ATLAS7 5
66 #define SIRFSOC_DMA_CHAIN_FLAG_SHIFT_ATLAS7 25
67 #define SIRFSOC_DMA_CHAIN_ADDR_SHIFT 32
69 #define SIRFSOC_DMA_INT_FINI_INT_ATLAS7 BIT(0)
70 #define SIRFSOC_DMA_INT_CNT_INT_ATLAS7 BIT(1)
71 #define SIRFSOC_DMA_INT_PAU_INT_ATLAS7 BIT(2)
72 #define SIRFSOC_DMA_INT_LOOP_INT_ATLAS7 BIT(3)
73 #define SIRFSOC_DMA_INT_INV_INT_ATLAS7 BIT(4)
74 #define SIRFSOC_DMA_INT_END_INT_ATLAS7 BIT(5)
75 #define SIRFSOC_DMA_INT_ALL_ATLAS7 0x3F
77 /* xlen and dma_width register is in 4 bytes boundary */
78 #define SIRFSOC_DMA_WORD_LEN 4
79 #define SIRFSOC_DMA_XLEN_MAX_V1 0x800
80 #define SIRFSOC_DMA_XLEN_MAX_V2 0x1000
82 struct sirfsoc_dma_desc {
83 struct dma_async_tx_descriptor desc;
84 struct list_head node;
86 /* SiRFprimaII 2D-DMA parameters */
88 int xlen; /* DMA xlen */
89 int ylen; /* DMA ylen */
90 int width; /* DMA width */
92 bool cyclic; /* is loop DMA? */
93 bool chain; /* is chain DMA? */
94 u32 addr; /* DMA buffer address */
95 u64 chain_table[SIRFSOC_DMA_TABLE_NUM]; /* chain tbl */
98 struct sirfsoc_dma_chan {
100 struct list_head free;
101 struct list_head prepared;
102 struct list_head queued;
103 struct list_head active;
104 struct list_head completed;
105 unsigned long happened_cyclic;
106 unsigned long completed_cyclic;
108 /* Lock for this structure */
114 struct sirfsoc_dma_regs {
115 u32 ctrl[SIRFSOC_DMA_CHANNELS];
120 struct dma_device dma;
121 struct tasklet_struct tasklet;
122 struct sirfsoc_dma_chan channels[SIRFSOC_DMA_CHANNELS];
127 void (*exec_desc)(struct sirfsoc_dma_desc *sdesc,
128 int cid, int burst_mode, void __iomem *base);
129 struct sirfsoc_dma_regs regs_save;
132 struct sirfsoc_dmadata {
133 void (*exec)(struct sirfsoc_dma_desc *sdesc,
134 int cid, int burst_mode, void __iomem *base);
138 enum sirfsoc_dma_chain_flag {
139 SIRFSOC_DMA_CHAIN_NORMAL = 0x01,
140 SIRFSOC_DMA_CHAIN_PAUSE = 0x02,
141 SIRFSOC_DMA_CHAIN_LOOP = 0x03,
142 SIRFSOC_DMA_CHAIN_END = 0x04
145 #define DRV_NAME "sirfsoc_dma"
147 static int sirfsoc_dma_runtime_suspend(struct device *dev);
149 /* Convert struct dma_chan to struct sirfsoc_dma_chan */
151 struct sirfsoc_dma_chan *dma_chan_to_sirfsoc_dma_chan(struct dma_chan *c)
153 return container_of(c, struct sirfsoc_dma_chan, chan);
156 /* Convert struct dma_chan to struct sirfsoc_dma */
157 static inline struct sirfsoc_dma *dma_chan_to_sirfsoc_dma(struct dma_chan *c)
159 struct sirfsoc_dma_chan *schan = dma_chan_to_sirfsoc_dma_chan(c);
160 return container_of(schan, struct sirfsoc_dma, channels[c->chan_id]);
163 static void sirfsoc_dma_execute_hw_a7v2(struct sirfsoc_dma_desc *sdesc,
164 int cid, int burst_mode, void __iomem *base)
167 /* DMA v2 HW chain mode */
168 writel_relaxed((sdesc->dir << SIRFSOC_DMA_DIR_CTRL_BIT_ATLAS7) |
170 SIRFSOC_DMA_CHAIN_CTRL_BIT_ATLAS7) |
171 (0x8 << SIRFSOC_DMA_TAB_NUM_ATLAS7) | 0x3,
172 base + SIRFSOC_DMA_CH_CTRL);
174 /* DMA v2 legacy mode */
175 writel_relaxed(sdesc->xlen, base + SIRFSOC_DMA_CH_XLEN);
176 writel_relaxed(sdesc->ylen, base + SIRFSOC_DMA_CH_YLEN);
177 writel_relaxed(sdesc->width, base + SIRFSOC_DMA_WIDTH_ATLAS7);
178 writel_relaxed((sdesc->width*((sdesc->ylen+1)>>1)),
179 base + SIRFSOC_DMA_MUL_ATLAS7);
180 writel_relaxed((sdesc->dir << SIRFSOC_DMA_DIR_CTRL_BIT_ATLAS7) |
182 SIRFSOC_DMA_CHAIN_CTRL_BIT_ATLAS7) |
183 0x3, base + SIRFSOC_DMA_CH_CTRL);
185 writel_relaxed(sdesc->chain ? SIRFSOC_DMA_INT_END_INT_ATLAS7 :
186 (SIRFSOC_DMA_INT_FINI_INT_ATLAS7 |
187 SIRFSOC_DMA_INT_LOOP_INT_ATLAS7),
188 base + SIRFSOC_DMA_INT_EN_ATLAS7);
189 writel(sdesc->addr, base + SIRFSOC_DMA_CH_ADDR);
191 writel(0x10001, base + SIRFSOC_DMA_LOOP_CTRL_ATLAS7);
194 static void sirfsoc_dma_execute_hw_a7v1(struct sirfsoc_dma_desc *sdesc,
195 int cid, int burst_mode, void __iomem *base)
197 writel_relaxed(1, base + SIRFSOC_DMA_IOBG_SCMD_EN);
198 writel_relaxed((1 << cid), base + SIRFSOC_DMA_EARLY_RESP_SET);
199 writel_relaxed(sdesc->width, base + SIRFSOC_DMA_WIDTH_0 + cid * 4);
200 writel_relaxed(cid | (burst_mode << SIRFSOC_DMA_MODE_CTRL_BIT) |
201 (sdesc->dir << SIRFSOC_DMA_DIR_CTRL_BIT),
202 base + cid * 0x10 + SIRFSOC_DMA_CH_CTRL);
203 writel_relaxed(sdesc->xlen, base + cid * 0x10 + SIRFSOC_DMA_CH_XLEN);
204 writel_relaxed(sdesc->ylen, base + cid * 0x10 + SIRFSOC_DMA_CH_YLEN);
205 writel_relaxed(readl_relaxed(base + SIRFSOC_DMA_INT_EN) |
206 (1 << cid), base + SIRFSOC_DMA_INT_EN);
207 writel(sdesc->addr >> 2, base + cid * 0x10 + SIRFSOC_DMA_CH_ADDR);
209 writel((1 << cid) | 1 << (cid + 16) |
210 readl_relaxed(base + SIRFSOC_DMA_CH_LOOP_CTRL_ATLAS7),
211 base + SIRFSOC_DMA_CH_LOOP_CTRL_ATLAS7);
216 static void sirfsoc_dma_execute_hw_a6(struct sirfsoc_dma_desc *sdesc,
217 int cid, int burst_mode, void __iomem *base)
219 writel_relaxed(sdesc->width, base + SIRFSOC_DMA_WIDTH_0 + cid * 4);
220 writel_relaxed(cid | (burst_mode << SIRFSOC_DMA_MODE_CTRL_BIT) |
221 (sdesc->dir << SIRFSOC_DMA_DIR_CTRL_BIT),
222 base + cid * 0x10 + SIRFSOC_DMA_CH_CTRL);
223 writel_relaxed(sdesc->xlen, base + cid * 0x10 + SIRFSOC_DMA_CH_XLEN);
224 writel_relaxed(sdesc->ylen, base + cid * 0x10 + SIRFSOC_DMA_CH_YLEN);
225 writel_relaxed(readl_relaxed(base + SIRFSOC_DMA_INT_EN) |
226 (1 << cid), base + SIRFSOC_DMA_INT_EN);
227 writel(sdesc->addr >> 2, base + cid * 0x10 + SIRFSOC_DMA_CH_ADDR);
229 writel((1 << cid) | 1 << (cid + 16) |
230 readl_relaxed(base + SIRFSOC_DMA_CH_LOOP_CTRL),
231 base + SIRFSOC_DMA_CH_LOOP_CTRL);
236 /* Execute all queued DMA descriptors */
237 static void sirfsoc_dma_execute(struct sirfsoc_dma_chan *schan)
239 struct sirfsoc_dma *sdma = dma_chan_to_sirfsoc_dma(&schan->chan);
240 int cid = schan->chan.chan_id;
241 struct sirfsoc_dma_desc *sdesc = NULL;
245 * lock has been held by functions calling this, so we don't hold
249 sdesc = list_first_entry(&schan->queued, struct sirfsoc_dma_desc,
251 /* Move the first queued descriptor to active list */
252 list_move_tail(&sdesc->node, &schan->active);
254 if (sdma->type == SIRFSOC_DMA_VER_A7V2)
257 /* Start the DMA transfer */
258 sdma->exec_desc(sdesc, cid, schan->mode, base);
261 schan->happened_cyclic = schan->completed_cyclic = 0;
264 /* Interrupt handler */
265 static irqreturn_t sirfsoc_dma_irq(int irq, void *data)
267 struct sirfsoc_dma *sdma = data;
268 struct sirfsoc_dma_chan *schan;
269 struct sirfsoc_dma_desc *sdesc = NULL;
275 switch (sdma->type) {
276 case SIRFSOC_DMA_VER_A6:
277 case SIRFSOC_DMA_VER_A7V1:
278 is = readl(sdma->base + SIRFSOC_DMA_CH_INT);
279 reg = sdma->base + SIRFSOC_DMA_CH_INT;
280 while ((ch = fls(is) - 1) >= 0) {
282 writel_relaxed(1 << ch, reg);
283 schan = &sdma->channels[ch];
284 spin_lock(&schan->lock);
285 sdesc = list_first_entry(&schan->active,
286 struct sirfsoc_dma_desc, node);
287 if (!sdesc->cyclic) {
288 /* Execute queued descriptors */
289 list_splice_tail_init(&schan->active,
291 dma_cookie_complete(&sdesc->desc);
292 if (!list_empty(&schan->queued))
293 sirfsoc_dma_execute(schan);
295 schan->happened_cyclic++;
296 spin_unlock(&schan->lock);
300 case SIRFSOC_DMA_VER_A7V2:
301 is = readl(sdma->base + SIRFSOC_DMA_INT_ATLAS7);
303 reg = sdma->base + SIRFSOC_DMA_INT_ATLAS7;
304 writel_relaxed(SIRFSOC_DMA_INT_ALL_ATLAS7, reg);
305 schan = &sdma->channels[0];
306 spin_lock(&schan->lock);
307 sdesc = list_first_entry(&schan->active,
308 struct sirfsoc_dma_desc, node);
309 if (!sdesc->cyclic) {
310 chain = sdesc->chain;
311 if ((chain && (is & SIRFSOC_DMA_INT_END_INT_ATLAS7)) ||
313 (is & SIRFSOC_DMA_INT_FINI_INT_ATLAS7))) {
314 /* Execute queued descriptors */
315 list_splice_tail_init(&schan->active,
317 dma_cookie_complete(&sdesc->desc);
318 if (!list_empty(&schan->queued))
319 sirfsoc_dma_execute(schan);
321 } else if (sdesc->cyclic && (is &
322 SIRFSOC_DMA_INT_LOOP_INT_ATLAS7))
323 schan->happened_cyclic++;
325 spin_unlock(&schan->lock);
332 /* Schedule tasklet */
333 tasklet_schedule(&sdma->tasklet);
338 /* process completed descriptors */
339 static void sirfsoc_dma_process_completed(struct sirfsoc_dma *sdma)
341 dma_cookie_t last_cookie = 0;
342 struct sirfsoc_dma_chan *schan;
343 struct sirfsoc_dma_desc *sdesc;
344 struct dma_async_tx_descriptor *desc;
346 unsigned long happened_cyclic;
350 for (i = 0; i < sdma->dma.chancnt; i++) {
351 schan = &sdma->channels[i];
353 /* Get all completed descriptors */
354 spin_lock_irqsave(&schan->lock, flags);
355 if (!list_empty(&schan->completed)) {
356 list_splice_tail_init(&schan->completed, &list);
357 spin_unlock_irqrestore(&schan->lock, flags);
359 /* Execute callbacks and run dependencies */
360 list_for_each_entry(sdesc, &list, node) {
364 desc->callback(desc->callback_param);
366 last_cookie = desc->cookie;
367 dma_run_dependencies(desc);
370 /* Free descriptors */
371 spin_lock_irqsave(&schan->lock, flags);
372 list_splice_tail_init(&list, &schan->free);
373 schan->chan.completed_cookie = last_cookie;
374 spin_unlock_irqrestore(&schan->lock, flags);
376 if (list_empty(&schan->active)) {
377 spin_unlock_irqrestore(&schan->lock, flags);
381 /* for cyclic channel, desc is always in active list */
382 sdesc = list_first_entry(&schan->active,
383 struct sirfsoc_dma_desc, node);
386 happened_cyclic = schan->happened_cyclic;
387 spin_unlock_irqrestore(&schan->lock, flags);
390 while (happened_cyclic != schan->completed_cyclic) {
392 desc->callback(desc->callback_param);
393 schan->completed_cyclic++;
400 static void sirfsoc_dma_tasklet(unsigned long data)
402 struct sirfsoc_dma *sdma = (void *)data;
404 sirfsoc_dma_process_completed(sdma);
407 /* Submit descriptor to hardware */
408 static dma_cookie_t sirfsoc_dma_tx_submit(struct dma_async_tx_descriptor *txd)
410 struct sirfsoc_dma_chan *schan = dma_chan_to_sirfsoc_dma_chan(txd->chan);
411 struct sirfsoc_dma_desc *sdesc;
415 sdesc = container_of(txd, struct sirfsoc_dma_desc, desc);
417 spin_lock_irqsave(&schan->lock, flags);
419 /* Move descriptor to queue */
420 list_move_tail(&sdesc->node, &schan->queued);
422 cookie = dma_cookie_assign(txd);
424 spin_unlock_irqrestore(&schan->lock, flags);
429 static int sirfsoc_dma_slave_config(struct dma_chan *chan,
430 struct dma_slave_config *config)
432 struct sirfsoc_dma_chan *schan = dma_chan_to_sirfsoc_dma_chan(chan);
435 if ((config->src_addr_width != DMA_SLAVE_BUSWIDTH_4_BYTES) ||
436 (config->dst_addr_width != DMA_SLAVE_BUSWIDTH_4_BYTES))
439 spin_lock_irqsave(&schan->lock, flags);
440 schan->mode = (config->src_maxburst == 4 ? 1 : 0);
441 spin_unlock_irqrestore(&schan->lock, flags);
446 static int sirfsoc_dma_terminate_all(struct dma_chan *chan)
448 struct sirfsoc_dma_chan *schan = dma_chan_to_sirfsoc_dma_chan(chan);
449 struct sirfsoc_dma *sdma = dma_chan_to_sirfsoc_dma(&schan->chan);
450 int cid = schan->chan.chan_id;
453 spin_lock_irqsave(&schan->lock, flags);
455 switch (sdma->type) {
456 case SIRFSOC_DMA_VER_A7V1:
457 writel_relaxed(1 << cid, sdma->base + SIRFSOC_DMA_INT_EN_CLR);
458 writel_relaxed(1 << cid, sdma->base + SIRFSOC_DMA_CH_INT);
459 writel_relaxed((1 << cid) | 1 << (cid + 16),
461 SIRFSOC_DMA_CH_LOOP_CTRL_CLR_ATLAS7);
462 writel_relaxed(1 << cid, sdma->base + SIRFSOC_DMA_CH_VALID);
464 case SIRFSOC_DMA_VER_A7V2:
465 writel_relaxed(0, sdma->base + SIRFSOC_DMA_INT_EN_ATLAS7);
466 writel_relaxed(SIRFSOC_DMA_INT_ALL_ATLAS7,
467 sdma->base + SIRFSOC_DMA_INT_ATLAS7);
468 writel_relaxed(0, sdma->base + SIRFSOC_DMA_LOOP_CTRL_ATLAS7);
469 writel_relaxed(0, sdma->base + SIRFSOC_DMA_VALID_ATLAS7);
471 case SIRFSOC_DMA_VER_A6:
472 writel_relaxed(readl_relaxed(sdma->base + SIRFSOC_DMA_INT_EN) &
473 ~(1 << cid), sdma->base + SIRFSOC_DMA_INT_EN);
474 writel_relaxed(readl_relaxed(sdma->base +
475 SIRFSOC_DMA_CH_LOOP_CTRL) &
476 ~((1 << cid) | 1 << (cid + 16)),
477 sdma->base + SIRFSOC_DMA_CH_LOOP_CTRL);
478 writel_relaxed(1 << cid, sdma->base + SIRFSOC_DMA_CH_VALID);
484 list_splice_tail_init(&schan->active, &schan->free);
485 list_splice_tail_init(&schan->queued, &schan->free);
487 spin_unlock_irqrestore(&schan->lock, flags);
492 static int sirfsoc_dma_pause_chan(struct dma_chan *chan)
494 struct sirfsoc_dma_chan *schan = dma_chan_to_sirfsoc_dma_chan(chan);
495 struct sirfsoc_dma *sdma = dma_chan_to_sirfsoc_dma(&schan->chan);
496 int cid = schan->chan.chan_id;
499 spin_lock_irqsave(&schan->lock, flags);
501 switch (sdma->type) {
502 case SIRFSOC_DMA_VER_A7V1:
503 writel_relaxed((1 << cid) | 1 << (cid + 16),
505 SIRFSOC_DMA_CH_LOOP_CTRL_CLR_ATLAS7);
507 case SIRFSOC_DMA_VER_A7V2:
508 writel_relaxed(0, sdma->base + SIRFSOC_DMA_LOOP_CTRL_ATLAS7);
510 case SIRFSOC_DMA_VER_A6:
511 writel_relaxed(readl_relaxed(sdma->base +
512 SIRFSOC_DMA_CH_LOOP_CTRL) &
513 ~((1 << cid) | 1 << (cid + 16)),
514 sdma->base + SIRFSOC_DMA_CH_LOOP_CTRL);
521 spin_unlock_irqrestore(&schan->lock, flags);
526 static int sirfsoc_dma_resume_chan(struct dma_chan *chan)
528 struct sirfsoc_dma_chan *schan = dma_chan_to_sirfsoc_dma_chan(chan);
529 struct sirfsoc_dma *sdma = dma_chan_to_sirfsoc_dma(&schan->chan);
530 int cid = schan->chan.chan_id;
533 spin_lock_irqsave(&schan->lock, flags);
534 switch (sdma->type) {
535 case SIRFSOC_DMA_VER_A7V1:
536 writel_relaxed((1 << cid) | 1 << (cid + 16),
537 sdma->base + SIRFSOC_DMA_CH_LOOP_CTRL_ATLAS7);
539 case SIRFSOC_DMA_VER_A7V2:
540 writel_relaxed(0x10001,
541 sdma->base + SIRFSOC_DMA_LOOP_CTRL_ATLAS7);
543 case SIRFSOC_DMA_VER_A6:
544 writel_relaxed(readl_relaxed(sdma->base +
545 SIRFSOC_DMA_CH_LOOP_CTRL) |
546 ((1 << cid) | 1 << (cid + 16)),
547 sdma->base + SIRFSOC_DMA_CH_LOOP_CTRL);
554 spin_unlock_irqrestore(&schan->lock, flags);
559 /* Alloc channel resources */
560 static int sirfsoc_dma_alloc_chan_resources(struct dma_chan *chan)
562 struct sirfsoc_dma *sdma = dma_chan_to_sirfsoc_dma(chan);
563 struct sirfsoc_dma_chan *schan = dma_chan_to_sirfsoc_dma_chan(chan);
564 struct sirfsoc_dma_desc *sdesc;
569 pm_runtime_get_sync(sdma->dma.dev);
571 /* Alloc descriptors for this channel */
572 for (i = 0; i < SIRFSOC_DMA_DESCRIPTORS; i++) {
573 sdesc = kzalloc(sizeof(*sdesc), GFP_KERNEL);
575 dev_notice(sdma->dma.dev, "Memory allocation error. "
576 "Allocated only %u descriptors\n", i);
580 dma_async_tx_descriptor_init(&sdesc->desc, chan);
581 sdesc->desc.flags = DMA_CTRL_ACK;
582 sdesc->desc.tx_submit = sirfsoc_dma_tx_submit;
584 list_add_tail(&sdesc->node, &descs);
587 /* Return error only if no descriptors were allocated */
591 spin_lock_irqsave(&schan->lock, flags);
593 list_splice_tail_init(&descs, &schan->free);
594 spin_unlock_irqrestore(&schan->lock, flags);
599 /* Free channel resources */
600 static void sirfsoc_dma_free_chan_resources(struct dma_chan *chan)
602 struct sirfsoc_dma_chan *schan = dma_chan_to_sirfsoc_dma_chan(chan);
603 struct sirfsoc_dma *sdma = dma_chan_to_sirfsoc_dma(chan);
604 struct sirfsoc_dma_desc *sdesc, *tmp;
608 spin_lock_irqsave(&schan->lock, flags);
610 /* Channel must be idle */
611 BUG_ON(!list_empty(&schan->prepared));
612 BUG_ON(!list_empty(&schan->queued));
613 BUG_ON(!list_empty(&schan->active));
614 BUG_ON(!list_empty(&schan->completed));
617 list_splice_tail_init(&schan->free, &descs);
619 spin_unlock_irqrestore(&schan->lock, flags);
621 /* Free descriptors */
622 list_for_each_entry_safe(sdesc, tmp, &descs, node)
625 pm_runtime_put(sdma->dma.dev);
628 /* Send pending descriptor to hardware */
629 static void sirfsoc_dma_issue_pending(struct dma_chan *chan)
631 struct sirfsoc_dma_chan *schan = dma_chan_to_sirfsoc_dma_chan(chan);
634 spin_lock_irqsave(&schan->lock, flags);
636 if (list_empty(&schan->active) && !list_empty(&schan->queued))
637 sirfsoc_dma_execute(schan);
639 spin_unlock_irqrestore(&schan->lock, flags);
642 /* Check request completion status */
643 static enum dma_status
644 sirfsoc_dma_tx_status(struct dma_chan *chan, dma_cookie_t cookie,
645 struct dma_tx_state *txstate)
647 struct sirfsoc_dma *sdma = dma_chan_to_sirfsoc_dma(chan);
648 struct sirfsoc_dma_chan *schan = dma_chan_to_sirfsoc_dma_chan(chan);
651 struct sirfsoc_dma_desc *sdesc;
652 int cid = schan->chan.chan_id;
653 unsigned long dma_pos;
654 unsigned long dma_request_bytes;
655 unsigned long residue;
657 spin_lock_irqsave(&schan->lock, flags);
659 if (list_empty(&schan->active)) {
660 ret = dma_cookie_status(chan, cookie, txstate);
661 dma_set_residue(txstate, 0);
662 spin_unlock_irqrestore(&schan->lock, flags);
665 sdesc = list_first_entry(&schan->active, struct sirfsoc_dma_desc, node);
667 dma_request_bytes = (sdesc->xlen + 1) * (sdesc->ylen + 1) *
668 (sdesc->width * SIRFSOC_DMA_WORD_LEN);
670 dma_request_bytes = sdesc->xlen * SIRFSOC_DMA_WORD_LEN;
672 ret = dma_cookie_status(chan, cookie, txstate);
674 if (sdma->type == SIRFSOC_DMA_VER_A7V2)
677 if (sdma->type == SIRFSOC_DMA_VER_A7V2) {
678 dma_pos = readl_relaxed(sdma->base + SIRFSOC_DMA_CUR_DATA_ADDR);
680 dma_pos = readl_relaxed(
681 sdma->base + cid * 0x10 + SIRFSOC_DMA_CH_ADDR) << 2;
684 residue = dma_request_bytes - (dma_pos - sdesc->addr);
685 dma_set_residue(txstate, residue);
687 spin_unlock_irqrestore(&schan->lock, flags);
692 static struct dma_async_tx_descriptor *sirfsoc_dma_prep_interleaved(
693 struct dma_chan *chan, struct dma_interleaved_template *xt,
696 struct sirfsoc_dma *sdma = dma_chan_to_sirfsoc_dma(chan);
697 struct sirfsoc_dma_chan *schan = dma_chan_to_sirfsoc_dma_chan(chan);
698 struct sirfsoc_dma_desc *sdesc = NULL;
699 unsigned long iflags;
702 if ((xt->dir != DMA_MEM_TO_DEV) && (xt->dir != DMA_DEV_TO_MEM)) {
707 /* Get free descriptor */
708 spin_lock_irqsave(&schan->lock, iflags);
709 if (!list_empty(&schan->free)) {
710 sdesc = list_first_entry(&schan->free, struct sirfsoc_dma_desc,
712 list_del(&sdesc->node);
714 spin_unlock_irqrestore(&schan->lock, iflags);
717 /* try to free completed descriptors */
718 sirfsoc_dma_process_completed(sdma);
723 /* Place descriptor in prepared list */
724 spin_lock_irqsave(&schan->lock, iflags);
727 * Number of chunks in a frame can only be 1 for prima2
728 * and ylen (number of frame - 1) must be at least 0
730 if ((xt->frame_size == 1) && (xt->numf > 0)) {
732 sdesc->xlen = xt->sgl[0].size / SIRFSOC_DMA_WORD_LEN;
733 sdesc->width = (xt->sgl[0].size + xt->sgl[0].icg) /
734 SIRFSOC_DMA_WORD_LEN;
735 sdesc->ylen = xt->numf - 1;
736 if (xt->dir == DMA_MEM_TO_DEV) {
737 sdesc->addr = xt->src_start;
740 sdesc->addr = xt->dst_start;
744 list_add_tail(&sdesc->node, &schan->prepared);
746 pr_err("sirfsoc DMA Invalid xfer\n");
750 spin_unlock_irqrestore(&schan->lock, iflags);
754 spin_unlock_irqrestore(&schan->lock, iflags);
760 static struct dma_async_tx_descriptor *
761 sirfsoc_dma_prep_cyclic(struct dma_chan *chan, dma_addr_t addr,
762 size_t buf_len, size_t period_len,
763 enum dma_transfer_direction direction, unsigned long flags)
765 struct sirfsoc_dma_chan *schan = dma_chan_to_sirfsoc_dma_chan(chan);
766 struct sirfsoc_dma_desc *sdesc = NULL;
767 unsigned long iflags;
770 * we only support cycle transfer with 2 period
771 * If the X-length is set to 0, it would be the loop mode.
772 * The DMA address keeps increasing until reaching the end of a loop
773 * area whose size is defined by (DMA_WIDTH x (Y_LENGTH + 1)). Then
774 * the DMA address goes back to the beginning of this area.
775 * In loop mode, the DMA data region is divided into two parts, BUFA
776 * and BUFB. DMA controller generates interrupts twice in each loop:
777 * when the DMA address reaches the end of BUFA or the end of the
780 if (buf_len != 2 * period_len)
781 return ERR_PTR(-EINVAL);
783 /* Get free descriptor */
784 spin_lock_irqsave(&schan->lock, iflags);
785 if (!list_empty(&schan->free)) {
786 sdesc = list_first_entry(&schan->free, struct sirfsoc_dma_desc,
788 list_del(&sdesc->node);
790 spin_unlock_irqrestore(&schan->lock, iflags);
795 /* Place descriptor in prepared list */
796 spin_lock_irqsave(&schan->lock, iflags);
800 sdesc->ylen = buf_len / SIRFSOC_DMA_WORD_LEN - 1;
802 list_add_tail(&sdesc->node, &schan->prepared);
803 spin_unlock_irqrestore(&schan->lock, iflags);
809 * The DMA controller consists of 16 independent DMA channels.
810 * Each channel is allocated to a different function
812 bool sirfsoc_dma_filter_id(struct dma_chan *chan, void *chan_id)
814 unsigned int ch_nr = (unsigned int) chan_id;
816 if (ch_nr == chan->chan_id +
817 chan->device->dev_id * SIRFSOC_DMA_CHANNELS)
822 EXPORT_SYMBOL(sirfsoc_dma_filter_id);
824 #define SIRFSOC_DMA_BUSWIDTHS \
825 (BIT(DMA_SLAVE_BUSWIDTH_UNDEFINED) | \
826 BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \
827 BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \
828 BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) | \
829 BIT(DMA_SLAVE_BUSWIDTH_8_BYTES))
831 static struct dma_chan *of_dma_sirfsoc_xlate(struct of_phandle_args *dma_spec,
832 struct of_dma *ofdma)
834 struct sirfsoc_dma *sdma = ofdma->of_dma_data;
835 unsigned int request = dma_spec->args[0];
837 if (request >= SIRFSOC_DMA_CHANNELS)
840 return dma_get_slave_channel(&sdma->channels[request].chan);
843 static int sirfsoc_dma_probe(struct platform_device *op)
845 struct device_node *dn = op->dev.of_node;
846 struct device *dev = &op->dev;
847 struct dma_device *dma;
848 struct sirfsoc_dma *sdma;
849 struct sirfsoc_dma_chan *schan;
850 struct sirfsoc_dmadata *data;
852 ulong regs_start, regs_size;
856 sdma = devm_kzalloc(dev, sizeof(*sdma), GFP_KERNEL);
858 dev_err(dev, "Memory exhausted!\n");
861 data = (struct sirfsoc_dmadata *)
862 (of_match_device(op->dev.driver->of_match_table,
864 sdma->exec_desc = data->exec;
865 sdma->type = data->type;
867 if (of_property_read_u32(dn, "cell-index", &id)) {
868 dev_err(dev, "Fail to get DMAC index\n");
872 sdma->irq = irq_of_parse_and_map(dn, 0);
873 if (sdma->irq == NO_IRQ) {
874 dev_err(dev, "Error mapping IRQ!\n");
878 sdma->clk = devm_clk_get(dev, NULL);
879 if (IS_ERR(sdma->clk)) {
880 dev_err(dev, "failed to get a clock.\n");
881 return PTR_ERR(sdma->clk);
884 ret = of_address_to_resource(dn, 0, &res);
886 dev_err(dev, "Error parsing memory region!\n");
890 regs_start = res.start;
891 regs_size = resource_size(&res);
893 sdma->base = devm_ioremap(dev, regs_start, regs_size);
895 dev_err(dev, "Error mapping memory region!\n");
900 ret = request_irq(sdma->irq, &sirfsoc_dma_irq, 0, DRV_NAME, sdma);
902 dev_err(dev, "Error requesting IRQ!\n");
910 dma->device_alloc_chan_resources = sirfsoc_dma_alloc_chan_resources;
911 dma->device_free_chan_resources = sirfsoc_dma_free_chan_resources;
912 dma->device_issue_pending = sirfsoc_dma_issue_pending;
913 dma->device_config = sirfsoc_dma_slave_config;
914 dma->device_pause = sirfsoc_dma_pause_chan;
915 dma->device_resume = sirfsoc_dma_resume_chan;
916 dma->device_terminate_all = sirfsoc_dma_terminate_all;
917 dma->device_tx_status = sirfsoc_dma_tx_status;
918 dma->device_prep_interleaved_dma = sirfsoc_dma_prep_interleaved;
919 dma->device_prep_dma_cyclic = sirfsoc_dma_prep_cyclic;
920 dma->src_addr_widths = SIRFSOC_DMA_BUSWIDTHS;
921 dma->dst_addr_widths = SIRFSOC_DMA_BUSWIDTHS;
922 dma->directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
924 INIT_LIST_HEAD(&dma->channels);
925 dma_cap_set(DMA_SLAVE, dma->cap_mask);
926 dma_cap_set(DMA_CYCLIC, dma->cap_mask);
927 dma_cap_set(DMA_INTERLEAVE, dma->cap_mask);
928 dma_cap_set(DMA_PRIVATE, dma->cap_mask);
930 for (i = 0; i < SIRFSOC_DMA_CHANNELS; i++) {
931 schan = &sdma->channels[i];
933 schan->chan.device = dma;
934 dma_cookie_init(&schan->chan);
936 INIT_LIST_HEAD(&schan->free);
937 INIT_LIST_HEAD(&schan->prepared);
938 INIT_LIST_HEAD(&schan->queued);
939 INIT_LIST_HEAD(&schan->active);
940 INIT_LIST_HEAD(&schan->completed);
942 spin_lock_init(&schan->lock);
943 list_add_tail(&schan->chan.device_node, &dma->channels);
946 tasklet_init(&sdma->tasklet, sirfsoc_dma_tasklet, (unsigned long)sdma);
948 /* Register DMA engine */
949 dev_set_drvdata(dev, sdma);
951 ret = dma_async_device_register(dma);
955 /* Device-tree DMA controller registration */
956 ret = of_dma_controller_register(dn, of_dma_sirfsoc_xlate, sdma);
958 dev_err(dev, "failed to register DMA controller\n");
962 pm_runtime_enable(&op->dev);
963 dev_info(dev, "initialized SIRFSOC DMAC driver\n");
968 dma_async_device_unregister(dma);
970 free_irq(sdma->irq, sdma);
972 irq_dispose_mapping(sdma->irq);
976 static int sirfsoc_dma_remove(struct platform_device *op)
978 struct device *dev = &op->dev;
979 struct sirfsoc_dma *sdma = dev_get_drvdata(dev);
981 of_dma_controller_free(op->dev.of_node);
982 dma_async_device_unregister(&sdma->dma);
983 free_irq(sdma->irq, sdma);
984 irq_dispose_mapping(sdma->irq);
985 pm_runtime_disable(&op->dev);
986 if (!pm_runtime_status_suspended(&op->dev))
987 sirfsoc_dma_runtime_suspend(&op->dev);
992 static int sirfsoc_dma_runtime_suspend(struct device *dev)
994 struct sirfsoc_dma *sdma = dev_get_drvdata(dev);
996 clk_disable_unprepare(sdma->clk);
1000 static int sirfsoc_dma_runtime_resume(struct device *dev)
1002 struct sirfsoc_dma *sdma = dev_get_drvdata(dev);
1005 ret = clk_prepare_enable(sdma->clk);
1007 dev_err(dev, "clk_enable failed: %d\n", ret);
1013 #ifdef CONFIG_PM_SLEEP
1014 static int sirfsoc_dma_pm_suspend(struct device *dev)
1016 struct sirfsoc_dma *sdma = dev_get_drvdata(dev);
1017 struct sirfsoc_dma_regs *save = &sdma->regs_save;
1018 struct sirfsoc_dma_desc *sdesc;
1019 struct sirfsoc_dma_chan *schan;
1026 * if we were runtime-suspended before, resume to enable clock
1027 * before accessing register
1029 if (pm_runtime_status_suspended(dev)) {
1030 ret = sirfsoc_dma_runtime_resume(dev);
1035 if (sdma->type == SIRFSOC_DMA_VER_A7V2) {
1037 int_offset = SIRFSOC_DMA_INT_EN_ATLAS7;
1039 count = SIRFSOC_DMA_CHANNELS;
1040 int_offset = SIRFSOC_DMA_INT_EN;
1044 * DMA controller will lose all registers while suspending
1045 * so we need to save registers for active channels
1047 for (ch = 0; ch < count; ch++) {
1048 schan = &sdma->channels[ch];
1049 if (list_empty(&schan->active))
1051 sdesc = list_first_entry(&schan->active,
1052 struct sirfsoc_dma_desc,
1054 save->ctrl[ch] = readl_relaxed(sdma->base +
1055 ch * 0x10 + SIRFSOC_DMA_CH_CTRL);
1057 save->interrupt_en = readl_relaxed(sdma->base + int_offset);
1060 sirfsoc_dma_runtime_suspend(dev);
1065 static int sirfsoc_dma_pm_resume(struct device *dev)
1067 struct sirfsoc_dma *sdma = dev_get_drvdata(dev);
1068 struct sirfsoc_dma_regs *save = &sdma->regs_save;
1069 struct sirfsoc_dma_desc *sdesc;
1070 struct sirfsoc_dma_chan *schan;
1077 /* Enable clock before accessing register */
1078 ret = sirfsoc_dma_runtime_resume(dev);
1082 if (sdma->type == SIRFSOC_DMA_VER_A7V2) {
1084 int_offset = SIRFSOC_DMA_INT_EN_ATLAS7;
1085 width_offset = SIRFSOC_DMA_WIDTH_ATLAS7;
1087 count = SIRFSOC_DMA_CHANNELS;
1088 int_offset = SIRFSOC_DMA_INT_EN;
1089 width_offset = SIRFSOC_DMA_WIDTH_0;
1092 writel_relaxed(save->interrupt_en, sdma->base + int_offset);
1093 for (ch = 0; ch < count; ch++) {
1094 schan = &sdma->channels[ch];
1095 if (list_empty(&schan->active))
1097 sdesc = list_first_entry(&schan->active,
1098 struct sirfsoc_dma_desc,
1100 writel_relaxed(sdesc->width,
1101 sdma->base + width_offset + ch * 4);
1102 writel_relaxed(sdesc->xlen,
1103 sdma->base + ch * 0x10 + SIRFSOC_DMA_CH_XLEN);
1104 writel_relaxed(sdesc->ylen,
1105 sdma->base + ch * 0x10 + SIRFSOC_DMA_CH_YLEN);
1106 writel_relaxed(save->ctrl[ch],
1107 sdma->base + ch * 0x10 + SIRFSOC_DMA_CH_CTRL);
1108 if (sdma->type == SIRFSOC_DMA_VER_A7V2) {
1109 writel_relaxed(sdesc->addr,
1110 sdma->base + SIRFSOC_DMA_CH_ADDR);
1112 writel_relaxed(sdesc->addr >> 2,
1113 sdma->base + ch * 0x10 + SIRFSOC_DMA_CH_ADDR);
1118 /* if we were runtime-suspended before, suspend again */
1119 if (pm_runtime_status_suspended(dev))
1120 sirfsoc_dma_runtime_suspend(dev);
1126 static const struct dev_pm_ops sirfsoc_dma_pm_ops = {
1127 SET_RUNTIME_PM_OPS(sirfsoc_dma_runtime_suspend, sirfsoc_dma_runtime_resume, NULL)
1128 SET_SYSTEM_SLEEP_PM_OPS(sirfsoc_dma_pm_suspend, sirfsoc_dma_pm_resume)
1131 struct sirfsoc_dmadata sirfsoc_dmadata_a6 = {
1132 .exec = sirfsoc_dma_execute_hw_a6,
1133 .type = SIRFSOC_DMA_VER_A6,
1136 struct sirfsoc_dmadata sirfsoc_dmadata_a7v1 = {
1137 .exec = sirfsoc_dma_execute_hw_a7v1,
1138 .type = SIRFSOC_DMA_VER_A7V1,
1141 struct sirfsoc_dmadata sirfsoc_dmadata_a7v2 = {
1142 .exec = sirfsoc_dma_execute_hw_a7v2,
1143 .type = SIRFSOC_DMA_VER_A7V2,
1146 static const struct of_device_id sirfsoc_dma_match[] = {
1147 { .compatible = "sirf,prima2-dmac", .data = &sirfsoc_dmadata_a6,},
1148 { .compatible = "sirf,atlas7-dmac", .data = &sirfsoc_dmadata_a7v1,},
1149 { .compatible = "sirf,atlas7-dmac-v2", .data = &sirfsoc_dmadata_a7v2,},
1152 MODULE_DEVICE_TABLE(of, sirfsoc_dma_match);
1154 static struct platform_driver sirfsoc_dma_driver = {
1155 .probe = sirfsoc_dma_probe,
1156 .remove = sirfsoc_dma_remove,
1159 .pm = &sirfsoc_dma_pm_ops,
1160 .of_match_table = sirfsoc_dma_match,
1164 static __init int sirfsoc_dma_init(void)
1166 return platform_driver_register(&sirfsoc_dma_driver);
1169 static void __exit sirfsoc_dma_exit(void)
1171 platform_driver_unregister(&sirfsoc_dma_driver);
1174 subsys_initcall(sirfsoc_dma_init);
1175 module_exit(sirfsoc_dma_exit);
1179 MODULE_DESCRIPTION("SIRFSOC DMA control driver");
1180 MODULE_LICENSE("GPL v2");