tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * DMA controller driver for CSR SiRFprimaII
3 *
4 * Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company.
5 *
6 * Licensed under GPLv2 or later.
7 */
8
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/* 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
81
82struct sirfsoc_dma_desc {
83 struct dma_async_tx_descriptor desc;
84 struct list_head node;
85
86 /* SiRFprimaII 2D-DMA parameters */
87
88 int xlen; /* DMA xlen */
89 int ylen; /* DMA ylen */
90 int width; /* DMA width */
91 int dir;
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 */
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 /* Lock for this structure */
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/* Convert struct dma_chan to struct sirfsoc_dma_chan */
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/* Convert struct dma_chan to struct sirfsoc_dma */
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 /* DMA v2 HW chain mode */
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 /* 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) |
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/* Execute all queued DMA descriptors */
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 * lock has been held by functions calling this, so we don't hold
246 * lock again
247 */
248 base = sdma->base;
249 sdesc = list_first_entry(&schan->queued, struct sirfsoc_dma_desc,
250 node);
251 /* Move the first queued descriptor to active list */
252 list_move_tail(&sdesc->node, &schan->active);
253
254 if (sdma->type == SIRFSOC_DMA_VER_A7V2)
255 cid = 0;
256
257 /* Start the DMA transfer */
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/* Interrupt handler */
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 /* Execute queued descriptors */
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 /* Execute queued descriptors */
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 /* Schedule tasklet */
333 tasklet_schedule(&sdma->tasklet);
334
335 return IRQ_HANDLED;
336}
337
338/* process completed descriptors */
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 /* 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);
358
359 /* Execute callbacks and run dependencies */
360 list_for_each_entry(sdesc, &list, node) {
361 desc = &sdesc->desc;
362
363 dmaengine_desc_get_callback_invoke(desc, NULL);
364 last_cookie = desc->cookie;
365 dma_run_dependencies(desc);
366 }
367
368 /* Free descriptors */
369 spin_lock_irqsave(&schan->lock, flags);
370 list_splice_tail_init(&list, &schan->free);
371 schan->chan.completed_cookie = last_cookie;
372 spin_unlock_irqrestore(&schan->lock, flags);
373 } else {
374 if (list_empty(&schan->active)) {
375 spin_unlock_irqrestore(&schan->lock, flags);
376 continue;
377 }
378
379 /* for cyclic channel, desc is always in active list */
380 sdesc = list_first_entry(&schan->active,
381 struct sirfsoc_dma_desc, node);
382
383 /* cyclic DMA */
384 happened_cyclic = schan->happened_cyclic;
385 spin_unlock_irqrestore(&schan->lock, flags);
386
387 desc = &sdesc->desc;
388 while (happened_cyclic != schan->completed_cyclic) {
389 dmaengine_desc_get_callback_invoke(desc, NULL);
390 schan->completed_cyclic++;
391 }
392 }
393 }
394}
395
396/* DMA Tasklet */
397static void sirfsoc_dma_tasklet(unsigned long data)
398{
399 struct sirfsoc_dma *sdma = (void *)data;
400
401 sirfsoc_dma_process_completed(sdma);
402}
403
404/* Submit descriptor to hardware */
405static dma_cookie_t sirfsoc_dma_tx_submit(struct dma_async_tx_descriptor *txd)
406{
407 struct sirfsoc_dma_chan *schan = dma_chan_to_sirfsoc_dma_chan(txd->chan);
408 struct sirfsoc_dma_desc *sdesc;
409 unsigned long flags;
410 dma_cookie_t cookie;
411
412 sdesc = container_of(txd, struct sirfsoc_dma_desc, desc);
413
414 spin_lock_irqsave(&schan->lock, flags);
415
416 /* Move descriptor to queue */
417 list_move_tail(&sdesc->node, &schan->queued);
418
419 cookie = dma_cookie_assign(txd);
420
421 spin_unlock_irqrestore(&schan->lock, flags);
422
423 return cookie;
424}
425
426static int sirfsoc_dma_slave_config(struct dma_chan *chan,
427 struct dma_slave_config *config)
428{
429 struct sirfsoc_dma_chan *schan = dma_chan_to_sirfsoc_dma_chan(chan);
430 unsigned long flags;
431
432 if ((config->src_addr_width != DMA_SLAVE_BUSWIDTH_4_BYTES) ||
433 (config->dst_addr_width != DMA_SLAVE_BUSWIDTH_4_BYTES))
434 return -EINVAL;
435
436 spin_lock_irqsave(&schan->lock, flags);
437 schan->mode = (config->src_maxburst == 4 ? 1 : 0);
438 spin_unlock_irqrestore(&schan->lock, flags);
439
440 return 0;
441}
442
443static int sirfsoc_dma_terminate_all(struct dma_chan *chan)
444{
445 struct sirfsoc_dma_chan *schan = dma_chan_to_sirfsoc_dma_chan(chan);
446 struct sirfsoc_dma *sdma = dma_chan_to_sirfsoc_dma(&schan->chan);
447 int cid = schan->chan.chan_id;
448 unsigned long flags;
449
450 spin_lock_irqsave(&schan->lock, flags);
451
452 switch (sdma->type) {
453 case SIRFSOC_DMA_VER_A7V1:
454 writel_relaxed(1 << cid, sdma->base + SIRFSOC_DMA_INT_EN_CLR);
455 writel_relaxed(1 << cid, sdma->base + SIRFSOC_DMA_CH_INT);
456 writel_relaxed((1 << cid) | 1 << (cid + 16),
457 sdma->base +
458 SIRFSOC_DMA_CH_LOOP_CTRL_CLR_ATLAS7);
459 writel_relaxed(1 << cid, sdma->base + SIRFSOC_DMA_CH_VALID);
460 break;
461 case SIRFSOC_DMA_VER_A7V2:
462 writel_relaxed(0, sdma->base + SIRFSOC_DMA_INT_EN_ATLAS7);
463 writel_relaxed(SIRFSOC_DMA_INT_ALL_ATLAS7,
464 sdma->base + SIRFSOC_DMA_INT_ATLAS7);
465 writel_relaxed(0, sdma->base + SIRFSOC_DMA_LOOP_CTRL_ATLAS7);
466 writel_relaxed(0, sdma->base + SIRFSOC_DMA_VALID_ATLAS7);
467 break;
468 case SIRFSOC_DMA_VER_A6:
469 writel_relaxed(readl_relaxed(sdma->base + SIRFSOC_DMA_INT_EN) &
470 ~(1 << cid), sdma->base + SIRFSOC_DMA_INT_EN);
471 writel_relaxed(readl_relaxed(sdma->base +
472 SIRFSOC_DMA_CH_LOOP_CTRL) &
473 ~((1 << cid) | 1 << (cid + 16)),
474 sdma->base + SIRFSOC_DMA_CH_LOOP_CTRL);
475 writel_relaxed(1 << cid, sdma->base + SIRFSOC_DMA_CH_VALID);
476 break;
477 default:
478 break;
479 }
480
481 list_splice_tail_init(&schan->active, &schan->free);
482 list_splice_tail_init(&schan->queued, &schan->free);
483
484 spin_unlock_irqrestore(&schan->lock, flags);
485
486 return 0;
487}
488
489static int sirfsoc_dma_pause_chan(struct dma_chan *chan)
490{
491 struct sirfsoc_dma_chan *schan = dma_chan_to_sirfsoc_dma_chan(chan);
492 struct sirfsoc_dma *sdma = dma_chan_to_sirfsoc_dma(&schan->chan);
493 int cid = schan->chan.chan_id;
494 unsigned long flags;
495
496 spin_lock_irqsave(&schan->lock, flags);
497
498 switch (sdma->type) {
499 case SIRFSOC_DMA_VER_A7V1:
500 writel_relaxed((1 << cid) | 1 << (cid + 16),
501 sdma->base +
502 SIRFSOC_DMA_CH_LOOP_CTRL_CLR_ATLAS7);
503 break;
504 case SIRFSOC_DMA_VER_A7V2:
505 writel_relaxed(0, sdma->base + SIRFSOC_DMA_LOOP_CTRL_ATLAS7);
506 break;
507 case SIRFSOC_DMA_VER_A6:
508 writel_relaxed(readl_relaxed(sdma->base +
509 SIRFSOC_DMA_CH_LOOP_CTRL) &
510 ~((1 << cid) | 1 << (cid + 16)),
511 sdma->base + SIRFSOC_DMA_CH_LOOP_CTRL);
512 break;
513
514 default:
515 break;
516 }
517
518 spin_unlock_irqrestore(&schan->lock, flags);
519
520 return 0;
521}
522
523static int sirfsoc_dma_resume_chan(struct dma_chan *chan)
524{
525 struct sirfsoc_dma_chan *schan = dma_chan_to_sirfsoc_dma_chan(chan);
526 struct sirfsoc_dma *sdma = dma_chan_to_sirfsoc_dma(&schan->chan);
527 int cid = schan->chan.chan_id;
528 unsigned long flags;
529
530 spin_lock_irqsave(&schan->lock, flags);
531 switch (sdma->type) {
532 case SIRFSOC_DMA_VER_A7V1:
533 writel_relaxed((1 << cid) | 1 << (cid + 16),
534 sdma->base + SIRFSOC_DMA_CH_LOOP_CTRL_ATLAS7);
535 break;
536 case SIRFSOC_DMA_VER_A7V2:
537 writel_relaxed(0x10001,
538 sdma->base + SIRFSOC_DMA_LOOP_CTRL_ATLAS7);
539 break;
540 case SIRFSOC_DMA_VER_A6:
541 writel_relaxed(readl_relaxed(sdma->base +
542 SIRFSOC_DMA_CH_LOOP_CTRL) |
543 ((1 << cid) | 1 << (cid + 16)),
544 sdma->base + SIRFSOC_DMA_CH_LOOP_CTRL);
545 break;
546
547 default:
548 break;
549 }
550
551 spin_unlock_irqrestore(&schan->lock, flags);
552
553 return 0;
554}
555
556/* Alloc channel resources */
557static int sirfsoc_dma_alloc_chan_resources(struct dma_chan *chan)
558{
559 struct sirfsoc_dma *sdma = dma_chan_to_sirfsoc_dma(chan);
560 struct sirfsoc_dma_chan *schan = dma_chan_to_sirfsoc_dma_chan(chan);
561 struct sirfsoc_dma_desc *sdesc;
562 unsigned long flags;
563 LIST_HEAD(descs);
564 int i;
565
566 pm_runtime_get_sync(sdma->dma.dev);
567
568 /* Alloc descriptors for this channel */
569 for (i = 0; i < SIRFSOC_DMA_DESCRIPTORS; i++) {
570 sdesc = kzalloc(sizeof(*sdesc), GFP_KERNEL);
571 if (!sdesc) {
572 dev_notice(sdma->dma.dev, "Memory allocation error. "
573 "Allocated only %u descriptors\n", i);
574 break;
575 }
576
577 dma_async_tx_descriptor_init(&sdesc->desc, chan);
578 sdesc->desc.flags = DMA_CTRL_ACK;
579 sdesc->desc.tx_submit = sirfsoc_dma_tx_submit;
580
581 list_add_tail(&sdesc->node, &descs);
582 }
583
584 /* Return error only if no descriptors were allocated */
585 if (i == 0)
586 return -ENOMEM;
587
588 spin_lock_irqsave(&schan->lock, flags);
589
590 list_splice_tail_init(&descs, &schan->free);
591 spin_unlock_irqrestore(&schan->lock, flags);
592
593 return i;
594}
595
596/* Free channel resources */
597static void sirfsoc_dma_free_chan_resources(struct dma_chan *chan)
598{
599 struct sirfsoc_dma_chan *schan = dma_chan_to_sirfsoc_dma_chan(chan);
600 struct sirfsoc_dma *sdma = dma_chan_to_sirfsoc_dma(chan);
601 struct sirfsoc_dma_desc *sdesc, *tmp;
602 unsigned long flags;
603 LIST_HEAD(descs);
604
605 spin_lock_irqsave(&schan->lock, flags);
606
607 /* Channel must be idle */
608 BUG_ON(!list_empty(&schan->prepared));
609 BUG_ON(!list_empty(&schan->queued));
610 BUG_ON(!list_empty(&schan->active));
611 BUG_ON(!list_empty(&schan->completed));
612
613 /* Move data */
614 list_splice_tail_init(&schan->free, &descs);
615
616 spin_unlock_irqrestore(&schan->lock, flags);
617
618 /* Free descriptors */
619 list_for_each_entry_safe(sdesc, tmp, &descs, node)
620 kfree(sdesc);
621
622 pm_runtime_put(sdma->dma.dev);
623}
624
625/* Send pending descriptor to hardware */
626static void sirfsoc_dma_issue_pending(struct dma_chan *chan)
627{
628 struct sirfsoc_dma_chan *schan = dma_chan_to_sirfsoc_dma_chan(chan);
629 unsigned long flags;
630
631 spin_lock_irqsave(&schan->lock, flags);
632
633 if (list_empty(&schan->active) && !list_empty(&schan->queued))
634 sirfsoc_dma_execute(schan);
635
636 spin_unlock_irqrestore(&schan->lock, flags);
637}
638
639/* Check request completion status */
640static enum dma_status
641sirfsoc_dma_tx_status(struct dma_chan *chan, dma_cookie_t cookie,
642 struct dma_tx_state *txstate)
643{
644 struct sirfsoc_dma *sdma = dma_chan_to_sirfsoc_dma(chan);
645 struct sirfsoc_dma_chan *schan = dma_chan_to_sirfsoc_dma_chan(chan);
646 unsigned long flags;
647 enum dma_status ret;
648 struct sirfsoc_dma_desc *sdesc;
649 int cid = schan->chan.chan_id;
650 unsigned long dma_pos;
651 unsigned long dma_request_bytes;
652 unsigned long residue;
653
654 spin_lock_irqsave(&schan->lock, flags);
655
656 if (list_empty(&schan->active)) {
657 ret = dma_cookie_status(chan, cookie, txstate);
658 dma_set_residue(txstate, 0);
659 spin_unlock_irqrestore(&schan->lock, flags);
660 return ret;
661 }
662 sdesc = list_first_entry(&schan->active, struct sirfsoc_dma_desc, node);
663 if (sdesc->cyclic)
664 dma_request_bytes = (sdesc->xlen + 1) * (sdesc->ylen + 1) *
665 (sdesc->width * SIRFSOC_DMA_WORD_LEN);
666 else
667 dma_request_bytes = sdesc->xlen * SIRFSOC_DMA_WORD_LEN;
668
669 ret = dma_cookie_status(chan, cookie, txstate);
670
671 if (sdma->type == SIRFSOC_DMA_VER_A7V2)
672 cid = 0;
673
674 if (sdma->type == SIRFSOC_DMA_VER_A7V2) {
675 dma_pos = readl_relaxed(sdma->base + SIRFSOC_DMA_CUR_DATA_ADDR);
676 } else {
677 dma_pos = readl_relaxed(
678 sdma->base + cid * 0x10 + SIRFSOC_DMA_CH_ADDR) << 2;
679 }
680
681 residue = dma_request_bytes - (dma_pos - sdesc->addr);
682 dma_set_residue(txstate, residue);
683
684 spin_unlock_irqrestore(&schan->lock, flags);
685
686 return ret;
687}
688
689static struct dma_async_tx_descriptor *sirfsoc_dma_prep_interleaved(
690 struct dma_chan *chan, struct dma_interleaved_template *xt,
691 unsigned long flags)
692{
693 struct sirfsoc_dma *sdma = dma_chan_to_sirfsoc_dma(chan);
694 struct sirfsoc_dma_chan *schan = dma_chan_to_sirfsoc_dma_chan(chan);
695 struct sirfsoc_dma_desc *sdesc = NULL;
696 unsigned long iflags;
697 int ret;
698
699 if ((xt->dir != DMA_MEM_TO_DEV) && (xt->dir != DMA_DEV_TO_MEM)) {
700 ret = -EINVAL;
701 goto err_dir;
702 }
703
704 /* Get free descriptor */
705 spin_lock_irqsave(&schan->lock, iflags);
706 if (!list_empty(&schan->free)) {
707 sdesc = list_first_entry(&schan->free, struct sirfsoc_dma_desc,
708 node);
709 list_del(&sdesc->node);
710 }
711 spin_unlock_irqrestore(&schan->lock, iflags);
712
713 if (!sdesc) {
714 /* try to free completed descriptors */
715 sirfsoc_dma_process_completed(sdma);
716 ret = 0;
717 goto no_desc;
718 }
719
720 /* Place descriptor in prepared list */
721 spin_lock_irqsave(&schan->lock, iflags);
722
723 /*
724 * Number of chunks in a frame can only be 1 for prima2
725 * and ylen (number of frame - 1) must be at least 0
726 */
727 if ((xt->frame_size == 1) && (xt->numf > 0)) {
728 sdesc->cyclic = 0;
729 sdesc->xlen = xt->sgl[0].size / SIRFSOC_DMA_WORD_LEN;
730 sdesc->width = (xt->sgl[0].size + xt->sgl[0].icg) /
731 SIRFSOC_DMA_WORD_LEN;
732 sdesc->ylen = xt->numf - 1;
733 if (xt->dir == DMA_MEM_TO_DEV) {
734 sdesc->addr = xt->src_start;
735 sdesc->dir = 1;
736 } else {
737 sdesc->addr = xt->dst_start;
738 sdesc->dir = 0;
739 }
740
741 list_add_tail(&sdesc->node, &schan->prepared);
742 } else {
743 pr_err("sirfsoc DMA Invalid xfer\n");
744 ret = -EINVAL;
745 goto err_xfer;
746 }
747 spin_unlock_irqrestore(&schan->lock, iflags);
748
749 return &sdesc->desc;
750err_xfer:
751 spin_unlock_irqrestore(&schan->lock, iflags);
752no_desc:
753err_dir:
754 return ERR_PTR(ret);
755}
756
757static struct dma_async_tx_descriptor *
758sirfsoc_dma_prep_cyclic(struct dma_chan *chan, dma_addr_t addr,
759 size_t buf_len, size_t period_len,
760 enum dma_transfer_direction direction, unsigned long flags)
761{
762 struct sirfsoc_dma_chan *schan = dma_chan_to_sirfsoc_dma_chan(chan);
763 struct sirfsoc_dma_desc *sdesc = NULL;
764 unsigned long iflags;
765
766 /*
767 * we only support cycle transfer with 2 period
768 * If the X-length is set to 0, it would be the loop mode.
769 * The DMA address keeps increasing until reaching the end of a loop
770 * area whose size is defined by (DMA_WIDTH x (Y_LENGTH + 1)). Then
771 * the DMA address goes back to the beginning of this area.
772 * In loop mode, the DMA data region is divided into two parts, BUFA
773 * and BUFB. DMA controller generates interrupts twice in each loop:
774 * when the DMA address reaches the end of BUFA or the end of the
775 * BUFB
776 */
777 if (buf_len != 2 * period_len)
778 return ERR_PTR(-EINVAL);
779
780 /* Get free descriptor */
781 spin_lock_irqsave(&schan->lock, iflags);
782 if (!list_empty(&schan->free)) {
783 sdesc = list_first_entry(&schan->free, struct sirfsoc_dma_desc,
784 node);
785 list_del(&sdesc->node);
786 }
787 spin_unlock_irqrestore(&schan->lock, iflags);
788
789 if (!sdesc)
790 return NULL;
791
792 /* Place descriptor in prepared list */
793 spin_lock_irqsave(&schan->lock, iflags);
794 sdesc->addr = addr;
795 sdesc->cyclic = 1;
796 sdesc->xlen = 0;
797 sdesc->ylen = buf_len / SIRFSOC_DMA_WORD_LEN - 1;
798 sdesc->width = 1;
799 list_add_tail(&sdesc->node, &schan->prepared);
800 spin_unlock_irqrestore(&schan->lock, iflags);
801
802 return &sdesc->desc;
803}
804
805/*
806 * The DMA controller consists of 16 independent DMA channels.
807 * Each channel is allocated to a different function
808 */
809bool sirfsoc_dma_filter_id(struct dma_chan *chan, void *chan_id)
810{
811 unsigned int ch_nr = (unsigned int) chan_id;
812
813 if (ch_nr == chan->chan_id +
814 chan->device->dev_id * SIRFSOC_DMA_CHANNELS)
815 return true;
816
817 return false;
818}
819EXPORT_SYMBOL(sirfsoc_dma_filter_id);
820
821#define SIRFSOC_DMA_BUSWIDTHS \
822 (BIT(DMA_SLAVE_BUSWIDTH_UNDEFINED) | \
823 BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \
824 BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \
825 BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) | \
826 BIT(DMA_SLAVE_BUSWIDTH_8_BYTES))
827
828static struct dma_chan *of_dma_sirfsoc_xlate(struct of_phandle_args *dma_spec,
829 struct of_dma *ofdma)
830{
831 struct sirfsoc_dma *sdma = ofdma->of_dma_data;
832 unsigned int request = dma_spec->args[0];
833
834 if (request >= SIRFSOC_DMA_CHANNELS)
835 return NULL;
836
837 return dma_get_slave_channel(&sdma->channels[request].chan);
838}
839
840static int sirfsoc_dma_probe(struct platform_device *op)
841{
842 struct device_node *dn = op->dev.of_node;
843 struct device *dev = &op->dev;
844 struct dma_device *dma;
845 struct sirfsoc_dma *sdma;
846 struct sirfsoc_dma_chan *schan;
847 struct sirfsoc_dmadata *data;
848 struct resource res;
849 ulong regs_start, regs_size;
850 u32 id;
851 int ret, i;
852
853 sdma = devm_kzalloc(dev, sizeof(*sdma), GFP_KERNEL);
854 if (!sdma)
855 return -ENOMEM;
856
857 data = (struct sirfsoc_dmadata *)
858 (of_match_device(op->dev.driver->of_match_table,
859 &op->dev)->data);
860 sdma->exec_desc = data->exec;
861 sdma->type = data->type;
862
863 if (of_property_read_u32(dn, "cell-index", &id)) {
864 dev_err(dev, "Fail to get DMAC index\n");
865 return -ENODEV;
866 }
867
868 sdma->irq = irq_of_parse_and_map(dn, 0);
869 if (!sdma->irq) {
870 dev_err(dev, "Error mapping IRQ!\n");
871 return -EINVAL;
872 }
873
874 sdma->clk = devm_clk_get(dev, NULL);
875 if (IS_ERR(sdma->clk)) {
876 dev_err(dev, "failed to get a clock.\n");
877 return PTR_ERR(sdma->clk);
878 }
879
880 ret = of_address_to_resource(dn, 0, &res);
881 if (ret) {
882 dev_err(dev, "Error parsing memory region!\n");
883 goto irq_dispose;
884 }
885
886 regs_start = res.start;
887 regs_size = resource_size(&res);
888
889 sdma->base = devm_ioremap(dev, regs_start, regs_size);
890 if (!sdma->base) {
891 dev_err(dev, "Error mapping memory region!\n");
892 ret = -ENOMEM;
893 goto irq_dispose;
894 }
895
896 ret = request_irq(sdma->irq, &sirfsoc_dma_irq, 0, DRV_NAME, sdma);
897 if (ret) {
898 dev_err(dev, "Error requesting IRQ!\n");
899 ret = -EINVAL;
900 goto irq_dispose;
901 }
902
903 dma = &sdma->dma;
904 dma->dev = dev;
905
906 dma->device_alloc_chan_resources = sirfsoc_dma_alloc_chan_resources;
907 dma->device_free_chan_resources = sirfsoc_dma_free_chan_resources;
908 dma->device_issue_pending = sirfsoc_dma_issue_pending;
909 dma->device_config = sirfsoc_dma_slave_config;
910 dma->device_pause = sirfsoc_dma_pause_chan;
911 dma->device_resume = sirfsoc_dma_resume_chan;
912 dma->device_terminate_all = sirfsoc_dma_terminate_all;
913 dma->device_tx_status = sirfsoc_dma_tx_status;
914 dma->device_prep_interleaved_dma = sirfsoc_dma_prep_interleaved;
915 dma->device_prep_dma_cyclic = sirfsoc_dma_prep_cyclic;
916 dma->src_addr_widths = SIRFSOC_DMA_BUSWIDTHS;
917 dma->dst_addr_widths = SIRFSOC_DMA_BUSWIDTHS;
918 dma->directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
919
920 INIT_LIST_HEAD(&dma->channels);
921 dma_cap_set(DMA_SLAVE, dma->cap_mask);
922 dma_cap_set(DMA_CYCLIC, dma->cap_mask);
923 dma_cap_set(DMA_INTERLEAVE, dma->cap_mask);
924 dma_cap_set(DMA_PRIVATE, dma->cap_mask);
925
926 for (i = 0; i < SIRFSOC_DMA_CHANNELS; i++) {
927 schan = &sdma->channels[i];
928
929 schan->chan.device = dma;
930 dma_cookie_init(&schan->chan);
931
932 INIT_LIST_HEAD(&schan->free);
933 INIT_LIST_HEAD(&schan->prepared);
934 INIT_LIST_HEAD(&schan->queued);
935 INIT_LIST_HEAD(&schan->active);
936 INIT_LIST_HEAD(&schan->completed);
937
938 spin_lock_init(&schan->lock);
939 list_add_tail(&schan->chan.device_node, &dma->channels);
940 }
941
942 tasklet_init(&sdma->tasklet, sirfsoc_dma_tasklet, (unsigned long)sdma);
943
944 /* Register DMA engine */
945 dev_set_drvdata(dev, sdma);
946
947 ret = dma_async_device_register(dma);
948 if (ret)
949 goto free_irq;
950
951 /* Device-tree DMA controller registration */
952 ret = of_dma_controller_register(dn, of_dma_sirfsoc_xlate, sdma);
953 if (ret) {
954 dev_err(dev, "failed to register DMA controller\n");
955 goto unreg_dma_dev;
956 }
957
958 pm_runtime_enable(&op->dev);
959 dev_info(dev, "initialized SIRFSOC DMAC driver\n");
960
961 return 0;
962
963unreg_dma_dev:
964 dma_async_device_unregister(dma);
965free_irq:
966 free_irq(sdma->irq, sdma);
967irq_dispose:
968 irq_dispose_mapping(sdma->irq);
969 return ret;
970}
971
972static int sirfsoc_dma_remove(struct platform_device *op)
973{
974 struct device *dev = &op->dev;
975 struct sirfsoc_dma *sdma = dev_get_drvdata(dev);
976
977 of_dma_controller_free(op->dev.of_node);
978 dma_async_device_unregister(&sdma->dma);
979 free_irq(sdma->irq, sdma);
980 tasklet_kill(&sdma->tasklet);
981 irq_dispose_mapping(sdma->irq);
982 pm_runtime_disable(&op->dev);
983 if (!pm_runtime_status_suspended(&op->dev))
984 sirfsoc_dma_runtime_suspend(&op->dev);
985
986 return 0;
987}
988
989static int __maybe_unused sirfsoc_dma_runtime_suspend(struct device *dev)
990{
991 struct sirfsoc_dma *sdma = dev_get_drvdata(dev);
992
993 clk_disable_unprepare(sdma->clk);
994 return 0;
995}
996
997static int __maybe_unused sirfsoc_dma_runtime_resume(struct device *dev)
998{
999 struct sirfsoc_dma *sdma = dev_get_drvdata(dev);
1000 int ret;
1001
1002 ret = clk_prepare_enable(sdma->clk);
1003 if (ret < 0) {
1004 dev_err(dev, "clk_enable failed: %d\n", ret);
1005 return ret;
1006 }
1007 return 0;
1008}
1009
1010static int __maybe_unused sirfsoc_dma_pm_suspend(struct device *dev)
1011{
1012 struct sirfsoc_dma *sdma = dev_get_drvdata(dev);
1013 struct sirfsoc_dma_regs *save = &sdma->regs_save;
1014 struct sirfsoc_dma_chan *schan;
1015 int ch;
1016 int ret;
1017 int count;
1018 u32 int_offset;
1019
1020 /*
1021 * if we were runtime-suspended before, resume to enable clock
1022 * before accessing register
1023 */
1024 if (pm_runtime_status_suspended(dev)) {
1025 ret = sirfsoc_dma_runtime_resume(dev);
1026 if (ret < 0)
1027 return ret;
1028 }
1029
1030 if (sdma->type == SIRFSOC_DMA_VER_A7V2) {
1031 count = 1;
1032 int_offset = SIRFSOC_DMA_INT_EN_ATLAS7;
1033 } else {
1034 count = SIRFSOC_DMA_CHANNELS;
1035 int_offset = SIRFSOC_DMA_INT_EN;
1036 }
1037
1038 /*
1039 * DMA controller will lose all registers while suspending
1040 * so we need to save registers for active channels
1041 */
1042 for (ch = 0; ch < count; ch++) {
1043 schan = &sdma->channels[ch];
1044 if (list_empty(&schan->active))
1045 continue;
1046 save->ctrl[ch] = readl_relaxed(sdma->base +
1047 ch * 0x10 + SIRFSOC_DMA_CH_CTRL);
1048 }
1049 save->interrupt_en = readl_relaxed(sdma->base + int_offset);
1050
1051 /* Disable clock */
1052 sirfsoc_dma_runtime_suspend(dev);
1053
1054 return 0;
1055}
1056
1057static int __maybe_unused sirfsoc_dma_pm_resume(struct device *dev)
1058{
1059 struct sirfsoc_dma *sdma = dev_get_drvdata(dev);
1060 struct sirfsoc_dma_regs *save = &sdma->regs_save;
1061 struct sirfsoc_dma_desc *sdesc;
1062 struct sirfsoc_dma_chan *schan;
1063 int ch;
1064 int ret;
1065 int count;
1066 u32 int_offset;
1067 u32 width_offset;
1068
1069 /* Enable clock before accessing register */
1070 ret = sirfsoc_dma_runtime_resume(dev);
1071 if (ret < 0)
1072 return ret;
1073
1074 if (sdma->type == SIRFSOC_DMA_VER_A7V2) {
1075 count = 1;
1076 int_offset = SIRFSOC_DMA_INT_EN_ATLAS7;
1077 width_offset = SIRFSOC_DMA_WIDTH_ATLAS7;
1078 } else {
1079 count = SIRFSOC_DMA_CHANNELS;
1080 int_offset = SIRFSOC_DMA_INT_EN;
1081 width_offset = SIRFSOC_DMA_WIDTH_0;
1082 }
1083
1084 writel_relaxed(save->interrupt_en, sdma->base + int_offset);
1085 for (ch = 0; ch < count; ch++) {
1086 schan = &sdma->channels[ch];
1087 if (list_empty(&schan->active))
1088 continue;
1089 sdesc = list_first_entry(&schan->active,
1090 struct sirfsoc_dma_desc,
1091 node);
1092 writel_relaxed(sdesc->width,
1093 sdma->base + width_offset + ch * 4);
1094 writel_relaxed(sdesc->xlen,
1095 sdma->base + ch * 0x10 + SIRFSOC_DMA_CH_XLEN);
1096 writel_relaxed(sdesc->ylen,
1097 sdma->base + ch * 0x10 + SIRFSOC_DMA_CH_YLEN);
1098 writel_relaxed(save->ctrl[ch],
1099 sdma->base + ch * 0x10 + SIRFSOC_DMA_CH_CTRL);
1100 if (sdma->type == SIRFSOC_DMA_VER_A7V2) {
1101 writel_relaxed(sdesc->addr,
1102 sdma->base + SIRFSOC_DMA_CH_ADDR);
1103 } else {
1104 writel_relaxed(sdesc->addr >> 2,
1105 sdma->base + ch * 0x10 + SIRFSOC_DMA_CH_ADDR);
1106
1107 }
1108 }
1109
1110 /* if we were runtime-suspended before, suspend again */
1111 if (pm_runtime_status_suspended(dev))
1112 sirfsoc_dma_runtime_suspend(dev);
1113
1114 return 0;
1115}
1116
1117static const struct dev_pm_ops sirfsoc_dma_pm_ops = {
1118 SET_RUNTIME_PM_OPS(sirfsoc_dma_runtime_suspend, sirfsoc_dma_runtime_resume, NULL)
1119 SET_SYSTEM_SLEEP_PM_OPS(sirfsoc_dma_pm_suspend, sirfsoc_dma_pm_resume)
1120};
1121
1122static struct sirfsoc_dmadata sirfsoc_dmadata_a6 = {
1123 .exec = sirfsoc_dma_execute_hw_a6,
1124 .type = SIRFSOC_DMA_VER_A6,
1125};
1126
1127static struct sirfsoc_dmadata sirfsoc_dmadata_a7v1 = {
1128 .exec = sirfsoc_dma_execute_hw_a7v1,
1129 .type = SIRFSOC_DMA_VER_A7V1,
1130};
1131
1132static struct sirfsoc_dmadata sirfsoc_dmadata_a7v2 = {
1133 .exec = sirfsoc_dma_execute_hw_a7v2,
1134 .type = SIRFSOC_DMA_VER_A7V2,
1135};
1136
1137static const struct of_device_id sirfsoc_dma_match[] = {
1138 { .compatible = "sirf,prima2-dmac", .data = &sirfsoc_dmadata_a6,},
1139 { .compatible = "sirf,atlas7-dmac", .data = &sirfsoc_dmadata_a7v1,},
1140 { .compatible = "sirf,atlas7-dmac-v2", .data = &sirfsoc_dmadata_a7v2,},
1141 {},
1142};
1143MODULE_DEVICE_TABLE(of, sirfsoc_dma_match);
1144
1145static struct platform_driver sirfsoc_dma_driver = {
1146 .probe = sirfsoc_dma_probe,
1147 .remove = sirfsoc_dma_remove,
1148 .driver = {
1149 .name = DRV_NAME,
1150 .pm = &sirfsoc_dma_pm_ops,
1151 .of_match_table = sirfsoc_dma_match,
1152 },
1153};
1154
1155static __init int sirfsoc_dma_init(void)
1156{
1157 return platform_driver_register(&sirfsoc_dma_driver);
1158}
1159
1160static void __exit sirfsoc_dma_exit(void)
1161{
1162 platform_driver_unregister(&sirfsoc_dma_driver);
1163}
1164
1165subsys_initcall(sirfsoc_dma_init);
1166module_exit(sirfsoc_dma_exit);
1167
1168MODULE_AUTHOR("Rongjun Ying <rongjun.ying@csr.com>");
1169MODULE_AUTHOR("Barry Song <baohua.song@csr.com>");
1170MODULE_DESCRIPTION("SIRFSOC DMA control driver");
1171MODULE_LICENSE("GPL v2");