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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>
14#include <linux/io.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>
23
24#include "dmaengine.h"
25
26#define SIRFSOC_DMA_VER_A7V1 1
27#define SIRFSOC_DMA_VER_A7V2 2
28#define SIRFSOC_DMA_VER_A6 4
29
30#define SIRFSOC_DMA_DESCRIPTORS 16
31#define SIRFSOC_DMA_CHANNELS 16
32#define SIRFSOC_DMA_TABLE_NUM 256
33
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
38
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
58
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
68
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
76
77
78#define SIRFSOC_DMA_WORD_LEN 4
79#define SIRFSOC_DMA_XLEN_MAX_V1 0x800
80#define SIRFSOC_DMA_XLEN_MAX_V2 0x1000
81
82struct sirfsoc_dma_desc {
83 struct dma_async_tx_descriptor desc;
84 struct list_head node;
85
86
87
88 int xlen;
89 int ylen;
90 int width;
91 int dir;
92 bool cyclic;
93 bool chain;
94 u32 addr;
95 u64 chain_table[SIRFSOC_DMA_TABLE_NUM];
96};
97
98struct sirfsoc_dma_chan {
99 struct dma_chan 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;
107
108
109 spinlock_t lock;
110
111 int mode;
112};
113
114struct sirfsoc_dma_regs {
115 u32 ctrl[SIRFSOC_DMA_CHANNELS];
116 u32 interrupt_en;
117};
118
119struct sirfsoc_dma {
120 struct dma_device dma;
121 struct tasklet_struct tasklet;
122 struct sirfsoc_dma_chan channels[SIRFSOC_DMA_CHANNELS];
123 void __iomem *base;
124 int irq;
125 struct clk *clk;
126 int type;
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;
130};
131
132struct sirfsoc_dmadata {
133 void (*exec)(struct sirfsoc_dma_desc *sdesc,
134 int cid, int burst_mode, void __iomem *base);
135 int type;
136};
137
138enum 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
143};
144
145#define DRV_NAME "sirfsoc_dma"
146
147static int sirfsoc_dma_runtime_suspend(struct device *dev);
148
149
150static inline
151struct sirfsoc_dma_chan *dma_chan_to_sirfsoc_dma_chan(struct dma_chan *c)
152{
153 return container_of(c, struct sirfsoc_dma_chan, chan);
154}
155
156
157static inline struct sirfsoc_dma *dma_chan_to_sirfsoc_dma(struct dma_chan *c)
158{
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]);
161}
162
163static void sirfsoc_dma_execute_hw_a7v2(struct sirfsoc_dma_desc *sdesc,
164 int cid, int burst_mode, void __iomem *base)
165{
166 if (sdesc->chain) {
167
168 writel_relaxed((sdesc->dir << SIRFSOC_DMA_DIR_CTRL_BIT_ATLAS7) |
169 (sdesc->chain <<
170 SIRFSOC_DMA_CHAIN_CTRL_BIT_ATLAS7) |
171 (0x8 << SIRFSOC_DMA_TAB_NUM_ATLAS7) | 0x3,
172 base + SIRFSOC_DMA_CH_CTRL);
173 } else {
174
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) |
181 (sdesc->chain <<
182 SIRFSOC_DMA_CHAIN_CTRL_BIT_ATLAS7) |
183 0x3, base + SIRFSOC_DMA_CH_CTRL);
184 }
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);
190 if (sdesc->cyclic)
191 writel(0x10001, base + SIRFSOC_DMA_LOOP_CTRL_ATLAS7);
192}
193
194static void sirfsoc_dma_execute_hw_a7v1(struct sirfsoc_dma_desc *sdesc,
195 int cid, int burst_mode, void __iomem *base)
196{
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);
208 if (sdesc->cyclic) {
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);
212 }
213
214}
215
216static void sirfsoc_dma_execute_hw_a6(struct sirfsoc_dma_desc *sdesc,
217 int cid, int burst_mode, void __iomem *base)
218{
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);
228 if (sdesc->cyclic) {
229 writel((1 << cid) | 1 << (cid + 16) |
230 readl_relaxed(base + SIRFSOC_DMA_CH_LOOP_CTRL),
231 base + SIRFSOC_DMA_CH_LOOP_CTRL);
232 }
233
234}
235
236
237static void sirfsoc_dma_execute(struct sirfsoc_dma_chan *schan)
238{
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;
242 void __iomem *base;
243
244
245
246
247
248 base = sdma->base;
249 sdesc = list_first_entry(&schan->queued, struct sirfsoc_dma_desc,
250 node);
251
252 list_move_tail(&sdesc->node, &schan->active);
253
254 if (sdma->type == SIRFSOC_DMA_VER_A7V2)
255 cid = 0;
256
257
258 sdma->exec_desc(sdesc, cid, schan->mode, base);
259
260 if (sdesc->cyclic)
261 schan->happened_cyclic = schan->completed_cyclic = 0;
262}
263
264
265static irqreturn_t sirfsoc_dma_irq(int irq, void *data)
266{
267 struct sirfsoc_dma *sdma = data;
268 struct sirfsoc_dma_chan *schan;
269 struct sirfsoc_dma_desc *sdesc = NULL;
270 u32 is;
271 bool chain;
272 int ch;
273 void __iomem *reg;
274
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) {
281 is &= ~(1 << ch);
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
289 list_splice_tail_init(&schan->active,
290 &schan->completed);
291 dma_cookie_complete(&sdesc->desc);
292 if (!list_empty(&schan->queued))
293 sirfsoc_dma_execute(schan);
294 } else
295 schan->happened_cyclic++;
296 spin_unlock(&schan->lock);
297 }
298 break;
299
300 case SIRFSOC_DMA_VER_A7V2:
301 is = readl(sdma->base + SIRFSOC_DMA_INT_ATLAS7);
302
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)) ||
312 (!chain &&
313 (is & SIRFSOC_DMA_INT_FINI_INT_ATLAS7))) {
314
315 list_splice_tail_init(&schan->active,
316 &schan->completed);
317 dma_cookie_complete(&sdesc->desc);
318 if (!list_empty(&schan->queued))
319 sirfsoc_dma_execute(schan);
320 }
321 } else if (sdesc->cyclic && (is &
322 SIRFSOC_DMA_INT_LOOP_INT_ATLAS7))
323 schan->happened_cyclic++;
324
325 spin_unlock(&schan->lock);
326 break;
327
328 default:
329 break;
330 }
331
332
333 tasklet_schedule(&sdma->tasklet);
334
335 return IRQ_HANDLED;
336}
337
338
339static void sirfsoc_dma_process_completed(struct sirfsoc_dma *sdma)
340{
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;
345 unsigned long flags;
346 unsigned long happened_cyclic;
347 LIST_HEAD(list);
348 int i;
349
350 for (i = 0; i < sdma->dma.chancnt; i++) {
351 schan = &sdma->channels[i];
352
353
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);
358
359
360 list_for_each_entry(sdesc, &list, node) {
361 desc = &sdesc->desc;
362
363 if (desc->callback)
364 desc->callback(desc->callback_param);
365
366 last_cookie = desc->cookie;
367 dma_run_dependencies(desc);
368 }
369
370
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);
375 } else {
376 if (list_empty(&schan->active)) {
377 spin_unlock_irqrestore(&schan->lock, flags);
378 continue;
379 }
380
381
382 sdesc = list_first_entry(&schan->active,
383 struct sirfsoc_dma_desc, node);
384
385
386 happened_cyclic = schan->happened_cyclic;
387 spin_unlock_irqrestore(&schan->lock, flags);
388
389 desc = &sdesc->desc;
390 while (happened_cyclic != schan->completed_cyclic) {
391 if (desc->callback)
392 desc->callback(desc->callback_param);
393 schan->completed_cyclic++;
394 }
395 }
396 }
397}
398
399
400static void sirfsoc_dma_tasklet(unsigned long data)
401{
402 struct sirfsoc_dma *sdma = (void *)data;
403
404 sirfsoc_dma_process_completed(sdma);
405}
406
407
408static dma_cookie_t sirfsoc_dma_tx_submit(struct dma_async_tx_descriptor *txd)
409{
410 struct sirfsoc_dma_chan *schan = dma_chan_to_sirfsoc_dma_chan(txd->chan);
411 struct sirfsoc_dma_desc *sdesc;
412 unsigned long flags;
413 dma_cookie_t cookie;
414
415 sdesc = container_of(txd, struct sirfsoc_dma_desc, desc);
416
417 spin_lock_irqsave(&schan->lock, flags);
418
419
420 list_move_tail(&sdesc->node, &schan->queued);
421
422 cookie = dma_cookie_assign(txd);
423
424 spin_unlock_irqrestore(&schan->lock, flags);
425
426 return cookie;
427}
428
429static int sirfsoc_dma_slave_config(struct dma_chan *chan,
430 struct dma_slave_config *config)
431{
432 struct sirfsoc_dma_chan *schan = dma_chan_to_sirfsoc_dma_chan(chan);
433 unsigned long flags;
434
435 if ((config->src_addr_width != DMA_SLAVE_BUSWIDTH_4_BYTES) ||
436 (config->dst_addr_width != DMA_SLAVE_BUSWIDTH_4_BYTES))
437 return -EINVAL;
438
439 spin_lock_irqsave(&schan->lock, flags);
440 schan->mode = (config->src_maxburst == 4 ? 1 : 0);
441 spin_unlock_irqrestore(&schan->lock, flags);
442
443 return 0;
444}
445
446static int sirfsoc_dma_terminate_all(struct dma_chan *chan)
447{
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;
451 unsigned long flags;
452
453 spin_lock_irqsave(&schan->lock, flags);
454
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),
460 sdma->base +
461 SIRFSOC_DMA_CH_LOOP_CTRL_CLR_ATLAS7);
462 writel_relaxed(1 << cid, sdma->base + SIRFSOC_DMA_CH_VALID);
463 break;
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);
470 break;
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);
479 break;
480 default:
481 break;
482 }
483
484 list_splice_tail_init(&schan->active, &schan->free);
485 list_splice_tail_init(&schan->queued, &schan->free);
486
487 spin_unlock_irqrestore(&schan->lock, flags);
488
489 return 0;
490}
491
492static int sirfsoc_dma_pause_chan(struct dma_chan *chan)
493{
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;
497 unsigned long flags;
498
499 spin_lock_irqsave(&schan->lock, flags);
500
501 switch (sdma->type) {
502 case SIRFSOC_DMA_VER_A7V1:
503 writel_relaxed((1 << cid) | 1 << (cid + 16),
504 sdma->base +
505 SIRFSOC_DMA_CH_LOOP_CTRL_CLR_ATLAS7);
506 break;
507 case SIRFSOC_DMA_VER_A7V2:
508 writel_relaxed(0, sdma->base + SIRFSOC_DMA_LOOP_CTRL_ATLAS7);
509 break;
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);
515 break;
516
517 default:
518 break;
519 }
520
521 spin_unlock_irqrestore(&schan->lock, flags);
522
523 return 0;
524}
525
526static int sirfsoc_dma_resume_chan(struct dma_chan *chan)
527{
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;
531 unsigned long flags;
532
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);
538 break;
539 case SIRFSOC_DMA_VER_A7V2:
540 writel_relaxed(0x10001,
541 sdma->base + SIRFSOC_DMA_LOOP_CTRL_ATLAS7);
542 break;
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);
548 break;
549
550 default:
551 break;
552 }
553
554 spin_unlock_irqrestore(&schan->lock, flags);
555
556 return 0;
557}
558
559
560static int sirfsoc_dma_alloc_chan_resources(struct dma_chan *chan)
561{
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;
565 unsigned long flags;
566 LIST_HEAD(descs);
567 int i;
568
569 pm_runtime_get_sync(sdma->dma.dev);
570
571
572 for (i = 0; i < SIRFSOC_DMA_DESCRIPTORS; i++) {
573 sdesc = kzalloc(sizeof(*sdesc), GFP_KERNEL);
574 if (!sdesc) {
575 dev_notice(sdma->dma.dev, "Memory allocation error. "
576 "Allocated only %u descriptors\n", i);
577 break;
578 }
579
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;
583
584 list_add_tail(&sdesc->node, &descs);
585 }
586
587
588 if (i == 0)
589 return -ENOMEM;
590
591 spin_lock_irqsave(&schan->lock, flags);
592
593 list_splice_tail_init(&descs, &schan->free);
594 spin_unlock_irqrestore(&schan->lock, flags);
595
596 return i;
597}
598
599
600static void sirfsoc_dma_free_chan_resources(struct dma_chan *chan)
601{
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;
605 unsigned long flags;
606 LIST_HEAD(descs);
607
608 spin_lock_irqsave(&schan->lock, flags);
609
610
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));
615
616
617 list_splice_tail_init(&schan->free, &descs);
618
619 spin_unlock_irqrestore(&schan->lock, flags);
620
621
622 list_for_each_entry_safe(sdesc, tmp, &descs, node)
623 kfree(sdesc);
624
625 pm_runtime_put(sdma->dma.dev);
626}
627
628
629static void sirfsoc_dma_issue_pending(struct dma_chan *chan)
630{
631 struct sirfsoc_dma_chan *schan = dma_chan_to_sirfsoc_dma_chan(chan);
632 unsigned long flags;
633
634 spin_lock_irqsave(&schan->lock, flags);
635
636 if (list_empty(&schan->active) && !list_empty(&schan->queued))
637 sirfsoc_dma_execute(schan);
638
639 spin_unlock_irqrestore(&schan->lock, flags);
640}
641
642
643static enum dma_status
644sirfsoc_dma_tx_status(struct dma_chan *chan, dma_cookie_t cookie,
645 struct dma_tx_state *txstate)
646{
647 struct sirfsoc_dma *sdma = dma_chan_to_sirfsoc_dma(chan);
648 struct sirfsoc_dma_chan *schan = dma_chan_to_sirfsoc_dma_chan(chan);
649 unsigned long flags;
650 enum dma_status ret;
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;
656
657 spin_lock_irqsave(&schan->lock, flags);
658
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);
663 return ret;
664 }
665 sdesc = list_first_entry(&schan->active, struct sirfsoc_dma_desc, node);
666 if (sdesc->cyclic)
667 dma_request_bytes = (sdesc->xlen + 1) * (sdesc->ylen + 1) *
668 (sdesc->width * SIRFSOC_DMA_WORD_LEN);
669 else
670 dma_request_bytes = sdesc->xlen * SIRFSOC_DMA_WORD_LEN;
671
672 ret = dma_cookie_status(chan, cookie, txstate);
673
674 if (sdma->type == SIRFSOC_DMA_VER_A7V2)
675 cid = 0;
676
677 if (sdma->type == SIRFSOC_DMA_VER_A7V2) {
678 dma_pos = readl_relaxed(sdma->base + SIRFSOC_DMA_CUR_DATA_ADDR);
679 } else {
680 dma_pos = readl_relaxed(
681 sdma->base + cid * 0x10 + SIRFSOC_DMA_CH_ADDR) << 2;
682 }
683
684 residue = dma_request_bytes - (dma_pos - sdesc->addr);
685 dma_set_residue(txstate, residue);
686
687 spin_unlock_irqrestore(&schan->lock, flags);
688
689 return ret;
690}
691
692static struct dma_async_tx_descriptor *sirfsoc_dma_prep_interleaved(
693 struct dma_chan *chan, struct dma_interleaved_template *xt,
694 unsigned long flags)
695{
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;
700 int ret;
701
702 if ((xt->dir != DMA_MEM_TO_DEV) && (xt->dir != DMA_DEV_TO_MEM)) {
703 ret = -EINVAL;
704 goto err_dir;
705 }
706
707
708 spin_lock_irqsave(&schan->lock, iflags);
709 if (!list_empty(&schan->free)) {
710 sdesc = list_first_entry(&schan->free, struct sirfsoc_dma_desc,
711 node);
712 list_del(&sdesc->node);
713 }
714 spin_unlock_irqrestore(&schan->lock, iflags);
715
716 if (!sdesc) {
717
718 sirfsoc_dma_process_completed(sdma);
719 ret = 0;
720 goto no_desc;
721 }
722
723
724 spin_lock_irqsave(&schan->lock, iflags);
725
726
727
728
729
730 if ((xt->frame_size == 1) && (xt->numf > 0)) {
731 sdesc->cyclic = 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;
738 sdesc->dir = 1;
739 } else {
740 sdesc->addr = xt->dst_start;
741 sdesc->dir = 0;
742 }
743
744 list_add_tail(&sdesc->node, &schan->prepared);
745 } else {
746 pr_err("sirfsoc DMA Invalid xfer\n");
747 ret = -EINVAL;
748 goto err_xfer;
749 }
750 spin_unlock_irqrestore(&schan->lock, iflags);
751
752 return &sdesc->desc;
753err_xfer:
754 spin_unlock_irqrestore(&schan->lock, iflags);
755no_desc:
756err_dir:
757 return ERR_PTR(ret);
758}
759
760static struct dma_async_tx_descriptor *
761sirfsoc_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)
764{
765 struct sirfsoc_dma_chan *schan = dma_chan_to_sirfsoc_dma_chan(chan);
766 struct sirfsoc_dma_desc *sdesc = NULL;
767 unsigned long iflags;
768
769
770
771
772
773
774
775
776
777
778
779
780 if (buf_len != 2 * period_len)
781 return ERR_PTR(-EINVAL);
782
783
784 spin_lock_irqsave(&schan->lock, iflags);
785 if (!list_empty(&schan->free)) {
786 sdesc = list_first_entry(&schan->free, struct sirfsoc_dma_desc,
787 node);
788 list_del(&sdesc->node);
789 }
790 spin_unlock_irqrestore(&schan->lock, iflags);
791
792 if (!sdesc)
793 return NULL;
794
795
796 spin_lock_irqsave(&schan->lock, iflags);
797 sdesc->addr = addr;
798 sdesc->cyclic = 1;
799 sdesc->xlen = 0;
800 sdesc->ylen = buf_len / SIRFSOC_DMA_WORD_LEN - 1;
801 sdesc->width = 1;
802 list_add_tail(&sdesc->node, &schan->prepared);
803 spin_unlock_irqrestore(&schan->lock, iflags);
804
805 return &sdesc->desc;
806}
807
808
809
810
811
812bool sirfsoc_dma_filter_id(struct dma_chan *chan, void *chan_id)
813{
814 unsigned int ch_nr = (unsigned int) chan_id;
815
816 if (ch_nr == chan->chan_id +
817 chan->device->dev_id * SIRFSOC_DMA_CHANNELS)
818 return true;
819
820 return false;
821}
822EXPORT_SYMBOL(sirfsoc_dma_filter_id);
823
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))
830
831static struct dma_chan *of_dma_sirfsoc_xlate(struct of_phandle_args *dma_spec,
832 struct of_dma *ofdma)
833{
834 struct sirfsoc_dma *sdma = ofdma->of_dma_data;
835 unsigned int request = dma_spec->args[0];
836
837 if (request >= SIRFSOC_DMA_CHANNELS)
838 return NULL;
839
840 return dma_get_slave_channel(&sdma->channels[request].chan);
841}
842
843static int sirfsoc_dma_probe(struct platform_device *op)
844{
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;
851 struct resource res;
852 ulong regs_start, regs_size;
853 u32 id;
854 int ret, i;
855
856 sdma = devm_kzalloc(dev, sizeof(*sdma), GFP_KERNEL);
857 if (!sdma) {
858 dev_err(dev, "Memory exhausted!\n");
859 return -ENOMEM;
860 }
861 data = (struct sirfsoc_dmadata *)
862 (of_match_device(op->dev.driver->of_match_table,
863 &op->dev)->data);
864 sdma->exec_desc = data->exec;
865 sdma->type = data->type;
866
867 if (of_property_read_u32(dn, "cell-index", &id)) {
868 dev_err(dev, "Fail to get DMAC index\n");
869 return -ENODEV;
870 }
871
872 sdma->irq = irq_of_parse_and_map(dn, 0);
873 if (sdma->irq == NO_IRQ) {
874 dev_err(dev, "Error mapping IRQ!\n");
875 return -EINVAL;
876 }
877
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);
882 }
883
884 ret = of_address_to_resource(dn, 0, &res);
885 if (ret) {
886 dev_err(dev, "Error parsing memory region!\n");
887 goto irq_dispose;
888 }
889
890 regs_start = res.start;
891 regs_size = resource_size(&res);
892
893 sdma->base = devm_ioremap(dev, regs_start, regs_size);
894 if (!sdma->base) {
895 dev_err(dev, "Error mapping memory region!\n");
896 ret = -ENOMEM;
897 goto irq_dispose;
898 }
899
900 ret = request_irq(sdma->irq, &sirfsoc_dma_irq, 0, DRV_NAME, sdma);
901 if (ret) {
902 dev_err(dev, "Error requesting IRQ!\n");
903 ret = -EINVAL;
904 goto irq_dispose;
905 }
906
907 dma = &sdma->dma;
908 dma->dev = dev;
909
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);
923
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);
929
930 for (i = 0; i < SIRFSOC_DMA_CHANNELS; i++) {
931 schan = &sdma->channels[i];
932
933 schan->chan.device = dma;
934 dma_cookie_init(&schan->chan);
935
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);
941
942 spin_lock_init(&schan->lock);
943 list_add_tail(&schan->chan.device_node, &dma->channels);
944 }
945
946 tasklet_init(&sdma->tasklet, sirfsoc_dma_tasklet, (unsigned long)sdma);
947
948
949 dev_set_drvdata(dev, sdma);
950
951 ret = dma_async_device_register(dma);
952 if (ret)
953 goto free_irq;
954
955
956 ret = of_dma_controller_register(dn, of_dma_sirfsoc_xlate, sdma);
957 if (ret) {
958 dev_err(dev, "failed to register DMA controller\n");
959 goto unreg_dma_dev;
960 }
961
962 pm_runtime_enable(&op->dev);
963 dev_info(dev, "initialized SIRFSOC DMAC driver\n");
964
965 return 0;
966
967unreg_dma_dev:
968 dma_async_device_unregister(dma);
969free_irq:
970 free_irq(sdma->irq, sdma);
971irq_dispose:
972 irq_dispose_mapping(sdma->irq);
973 return ret;
974}
975
976static int sirfsoc_dma_remove(struct platform_device *op)
977{
978 struct device *dev = &op->dev;
979 struct sirfsoc_dma *sdma = dev_get_drvdata(dev);
980
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);
988
989 return 0;
990}
991
992static int __maybe_unused sirfsoc_dma_runtime_suspend(struct device *dev)
993{
994 struct sirfsoc_dma *sdma = dev_get_drvdata(dev);
995
996 clk_disable_unprepare(sdma->clk);
997 return 0;
998}
999
1000static int __maybe_unused sirfsoc_dma_runtime_resume(struct device *dev)
1001{
1002 struct sirfsoc_dma *sdma = dev_get_drvdata(dev);
1003 int ret;
1004
1005 ret = clk_prepare_enable(sdma->clk);
1006 if (ret < 0) {
1007 dev_err(dev, "clk_enable failed: %d\n", ret);
1008 return ret;
1009 }
1010 return 0;
1011}
1012
1013static int __maybe_unused sirfsoc_dma_pm_suspend(struct device *dev)
1014{
1015 struct sirfsoc_dma *sdma = dev_get_drvdata(dev);
1016 struct sirfsoc_dma_regs *save = &sdma->regs_save;
1017 struct sirfsoc_dma_desc *sdesc;
1018 struct sirfsoc_dma_chan *schan;
1019 int ch;
1020 int ret;
1021 int count;
1022 u32 int_offset;
1023
1024
1025
1026
1027
1028 if (pm_runtime_status_suspended(dev)) {
1029 ret = sirfsoc_dma_runtime_resume(dev);
1030 if (ret < 0)
1031 return ret;
1032 }
1033
1034 if (sdma->type == SIRFSOC_DMA_VER_A7V2) {
1035 count = 1;
1036 int_offset = SIRFSOC_DMA_INT_EN_ATLAS7;
1037 } else {
1038 count = SIRFSOC_DMA_CHANNELS;
1039 int_offset = SIRFSOC_DMA_INT_EN;
1040 }
1041
1042
1043
1044
1045
1046 for (ch = 0; ch < count; ch++) {
1047 schan = &sdma->channels[ch];
1048 if (list_empty(&schan->active))
1049 continue;
1050 sdesc = list_first_entry(&schan->active,
1051 struct sirfsoc_dma_desc,
1052 node);
1053 save->ctrl[ch] = readl_relaxed(sdma->base +
1054 ch * 0x10 + SIRFSOC_DMA_CH_CTRL);
1055 }
1056 save->interrupt_en = readl_relaxed(sdma->base + int_offset);
1057
1058
1059 sirfsoc_dma_runtime_suspend(dev);
1060
1061 return 0;
1062}
1063
1064static int __maybe_unused sirfsoc_dma_pm_resume(struct device *dev)
1065{
1066 struct sirfsoc_dma *sdma = dev_get_drvdata(dev);
1067 struct sirfsoc_dma_regs *save = &sdma->regs_save;
1068 struct sirfsoc_dma_desc *sdesc;
1069 struct sirfsoc_dma_chan *schan;
1070 int ch;
1071 int ret;
1072 int count;
1073 u32 int_offset;
1074 u32 width_offset;
1075
1076
1077 ret = sirfsoc_dma_runtime_resume(dev);
1078 if (ret < 0)
1079 return ret;
1080
1081 if (sdma->type == SIRFSOC_DMA_VER_A7V2) {
1082 count = 1;
1083 int_offset = SIRFSOC_DMA_INT_EN_ATLAS7;
1084 width_offset = SIRFSOC_DMA_WIDTH_ATLAS7;
1085 } else {
1086 count = SIRFSOC_DMA_CHANNELS;
1087 int_offset = SIRFSOC_DMA_INT_EN;
1088 width_offset = SIRFSOC_DMA_WIDTH_0;
1089 }
1090
1091 writel_relaxed(save->interrupt_en, sdma->base + int_offset);
1092 for (ch = 0; ch < count; ch++) {
1093 schan = &sdma->channels[ch];
1094 if (list_empty(&schan->active))
1095 continue;
1096 sdesc = list_first_entry(&schan->active,
1097 struct sirfsoc_dma_desc,
1098 node);
1099 writel_relaxed(sdesc->width,
1100 sdma->base + width_offset + ch * 4);
1101 writel_relaxed(sdesc->xlen,
1102 sdma->base + ch * 0x10 + SIRFSOC_DMA_CH_XLEN);
1103 writel_relaxed(sdesc->ylen,
1104 sdma->base + ch * 0x10 + SIRFSOC_DMA_CH_YLEN);
1105 writel_relaxed(save->ctrl[ch],
1106 sdma->base + ch * 0x10 + SIRFSOC_DMA_CH_CTRL);
1107 if (sdma->type == SIRFSOC_DMA_VER_A7V2) {
1108 writel_relaxed(sdesc->addr,
1109 sdma->base + SIRFSOC_DMA_CH_ADDR);
1110 } else {
1111 writel_relaxed(sdesc->addr >> 2,
1112 sdma->base + ch * 0x10 + SIRFSOC_DMA_CH_ADDR);
1113
1114 }
1115 }
1116
1117
1118 if (pm_runtime_status_suspended(dev))
1119 sirfsoc_dma_runtime_suspend(dev);
1120
1121 return 0;
1122}
1123
1124static const struct dev_pm_ops sirfsoc_dma_pm_ops = {
1125 SET_RUNTIME_PM_OPS(sirfsoc_dma_runtime_suspend, sirfsoc_dma_runtime_resume, NULL)
1126 SET_SYSTEM_SLEEP_PM_OPS(sirfsoc_dma_pm_suspend, sirfsoc_dma_pm_resume)
1127};
1128
1129struct sirfsoc_dmadata sirfsoc_dmadata_a6 = {
1130 .exec = sirfsoc_dma_execute_hw_a6,
1131 .type = SIRFSOC_DMA_VER_A6,
1132};
1133
1134struct sirfsoc_dmadata sirfsoc_dmadata_a7v1 = {
1135 .exec = sirfsoc_dma_execute_hw_a7v1,
1136 .type = SIRFSOC_DMA_VER_A7V1,
1137};
1138
1139struct sirfsoc_dmadata sirfsoc_dmadata_a7v2 = {
1140 .exec = sirfsoc_dma_execute_hw_a7v2,
1141 .type = SIRFSOC_DMA_VER_A7V2,
1142};
1143
1144static const struct of_device_id sirfsoc_dma_match[] = {
1145 { .compatible = "sirf,prima2-dmac", .data = &sirfsoc_dmadata_a6,},
1146 { .compatible = "sirf,atlas7-dmac", .data = &sirfsoc_dmadata_a7v1,},
1147 { .compatible = "sirf,atlas7-dmac-v2", .data = &sirfsoc_dmadata_a7v2,},
1148 {},
1149};
1150MODULE_DEVICE_TABLE(of, sirfsoc_dma_match);
1151
1152static struct platform_driver sirfsoc_dma_driver = {
1153 .probe = sirfsoc_dma_probe,
1154 .remove = sirfsoc_dma_remove,
1155 .driver = {
1156 .name = DRV_NAME,
1157 .pm = &sirfsoc_dma_pm_ops,
1158 .of_match_table = sirfsoc_dma_match,
1159 },
1160};
1161
1162static __init int sirfsoc_dma_init(void)
1163{
1164 return platform_driver_register(&sirfsoc_dma_driver);
1165}
1166
1167static void __exit sirfsoc_dma_exit(void)
1168{
1169 platform_driver_unregister(&sirfsoc_dma_driver);
1170}
1171
1172subsys_initcall(sirfsoc_dma_init);
1173module_exit(sirfsoc_dma_exit);
1174
1175MODULE_AUTHOR("Rongjun Ying <rongjun.ying@csr.com>");
1176MODULE_AUTHOR("Barry Song <baohua.song@csr.com>");
1177MODULE_DESCRIPTION("SIRFSOC DMA control driver");
1178MODULE_LICENSE("GPL v2");
1179
