This source file includes following definitions.
- is_imx1_dma
- is_imx27_dma
- to_imxdma_chan
- imxdma_chan_is_doing_cyclic
- imx_dmav1_writel
- imx_dmav1_readl
- imxdma_hw_chain
- imxdma_sg_next
- imxdma_enable_hw
- imxdma_disable_hw
- imxdma_watchdog
- imxdma_err_handler
- dma_irq_handle_channel
- dma_irq_handler
- imxdma_xfer_desc
- imxdma_tasklet
- imxdma_terminate_all
- imxdma_config_write
- imxdma_config
- imxdma_tx_status
- imxdma_tx_submit
- imxdma_alloc_chan_resources
- imxdma_free_chan_resources
- imxdma_prep_slave_sg
- imxdma_prep_dma_cyclic
- imxdma_prep_dma_memcpy
- imxdma_prep_dma_interleaved
- imxdma_issue_pending
- imxdma_filter_fn
- imxdma_xlate
- imxdma_probe
- imxdma_free_irq
- imxdma_remove
- imxdma_module_init
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11 #include <linux/err.h>
12 #include <linux/init.h>
13 #include <linux/types.h>
14 #include <linux/mm.h>
15 #include <linux/interrupt.h>
16 #include <linux/spinlock.h>
17 #include <linux/device.h>
18 #include <linux/dma-mapping.h>
19 #include <linux/slab.h>
20 #include <linux/platform_device.h>
21 #include <linux/clk.h>
22 #include <linux/dmaengine.h>
23 #include <linux/module.h>
24 #include <linux/of_device.h>
25 #include <linux/of_dma.h>
26
27 #include <asm/irq.h>
28 #include <linux/platform_data/dma-imx.h>
29
30 #include "dmaengine.h"
31 #define IMXDMA_MAX_CHAN_DESCRIPTORS 16
32 #define IMX_DMA_CHANNELS 16
33
34 #define IMX_DMA_2D_SLOTS 2
35 #define IMX_DMA_2D_SLOT_A 0
36 #define IMX_DMA_2D_SLOT_B 1
37
38 #define IMX_DMA_LENGTH_LOOP ((unsigned int)-1)
39 #define IMX_DMA_MEMSIZE_32 (0 << 4)
40 #define IMX_DMA_MEMSIZE_8 (1 << 4)
41 #define IMX_DMA_MEMSIZE_16 (2 << 4)
42 #define IMX_DMA_TYPE_LINEAR (0 << 10)
43 #define IMX_DMA_TYPE_2D (1 << 10)
44 #define IMX_DMA_TYPE_FIFO (2 << 10)
45
46 #define IMX_DMA_ERR_BURST (1 << 0)
47 #define IMX_DMA_ERR_REQUEST (1 << 1)
48 #define IMX_DMA_ERR_TRANSFER (1 << 2)
49 #define IMX_DMA_ERR_BUFFER (1 << 3)
50 #define IMX_DMA_ERR_TIMEOUT (1 << 4)
51
52 #define DMA_DCR 0x00
53 #define DMA_DISR 0x04
54 #define DMA_DIMR 0x08
55 #define DMA_DBTOSR 0x0c
56 #define DMA_DRTOSR 0x10
57 #define DMA_DSESR 0x14
58 #define DMA_DBOSR 0x18
59 #define DMA_DBTOCR 0x1c
60 #define DMA_WSRA 0x40
61 #define DMA_XSRA 0x44
62 #define DMA_YSRA 0x48
63 #define DMA_WSRB 0x4c
64 #define DMA_XSRB 0x50
65 #define DMA_YSRB 0x54
66 #define DMA_SAR(x) (0x80 + ((x) << 6))
67 #define DMA_DAR(x) (0x84 + ((x) << 6))
68 #define DMA_CNTR(x) (0x88 + ((x) << 6))
69 #define DMA_CCR(x) (0x8c + ((x) << 6))
70 #define DMA_RSSR(x) (0x90 + ((x) << 6))
71 #define DMA_BLR(x) (0x94 + ((x) << 6))
72 #define DMA_RTOR(x) (0x98 + ((x) << 6))
73 #define DMA_BUCR(x) (0x98 + ((x) << 6))
74 #define DMA_CCNR(x) (0x9C + ((x) << 6))
75
76 #define DCR_DRST (1<<1)
77 #define DCR_DEN (1<<0)
78 #define DBTOCR_EN (1<<15)
79 #define DBTOCR_CNT(x) ((x) & 0x7fff)
80 #define CNTR_CNT(x) ((x) & 0xffffff)
81 #define CCR_ACRPT (1<<14)
82 #define CCR_DMOD_LINEAR (0x0 << 12)
83 #define CCR_DMOD_2D (0x1 << 12)
84 #define CCR_DMOD_FIFO (0x2 << 12)
85 #define CCR_DMOD_EOBFIFO (0x3 << 12)
86 #define CCR_SMOD_LINEAR (0x0 << 10)
87 #define CCR_SMOD_2D (0x1 << 10)
88 #define CCR_SMOD_FIFO (0x2 << 10)
89 #define CCR_SMOD_EOBFIFO (0x3 << 10)
90 #define CCR_MDIR_DEC (1<<9)
91 #define CCR_MSEL_B (1<<8)
92 #define CCR_DSIZ_32 (0x0 << 6)
93 #define CCR_DSIZ_8 (0x1 << 6)
94 #define CCR_DSIZ_16 (0x2 << 6)
95 #define CCR_SSIZ_32 (0x0 << 4)
96 #define CCR_SSIZ_8 (0x1 << 4)
97 #define CCR_SSIZ_16 (0x2 << 4)
98 #define CCR_REN (1<<3)
99 #define CCR_RPT (1<<2)
100 #define CCR_FRC (1<<1)
101 #define CCR_CEN (1<<0)
102 #define RTOR_EN (1<<15)
103 #define RTOR_CLK (1<<14)
104 #define RTOR_PSC (1<<13)
105
106 enum imxdma_prep_type {
107 IMXDMA_DESC_MEMCPY,
108 IMXDMA_DESC_INTERLEAVED,
109 IMXDMA_DESC_SLAVE_SG,
110 IMXDMA_DESC_CYCLIC,
111 };
112
113 struct imx_dma_2d_config {
114 u16 xsr;
115 u16 ysr;
116 u16 wsr;
117 int count;
118 };
119
120 struct imxdma_desc {
121 struct list_head node;
122 struct dma_async_tx_descriptor desc;
123 enum dma_status status;
124 dma_addr_t src;
125 dma_addr_t dest;
126 size_t len;
127 enum dma_transfer_direction direction;
128 enum imxdma_prep_type type;
129
130 unsigned int config_port;
131 unsigned int config_mem;
132
133 unsigned int x;
134 unsigned int y;
135 unsigned int w;
136
137 struct scatterlist *sg;
138 unsigned int sgcount;
139 };
140
141 struct imxdma_channel {
142 int hw_chaining;
143 struct timer_list watchdog;
144 struct imxdma_engine *imxdma;
145 unsigned int channel;
146
147 struct tasklet_struct dma_tasklet;
148 struct list_head ld_free;
149 struct list_head ld_queue;
150 struct list_head ld_active;
151 int descs_allocated;
152 enum dma_slave_buswidth word_size;
153 dma_addr_t per_address;
154 u32 watermark_level;
155 struct dma_chan chan;
156 struct dma_async_tx_descriptor desc;
157 enum dma_status status;
158 int dma_request;
159 struct scatterlist *sg_list;
160 u32 ccr_from_device;
161 u32 ccr_to_device;
162 bool enabled_2d;
163 int slot_2d;
164 unsigned int irq;
165 struct dma_slave_config config;
166 };
167
168 enum imx_dma_type {
169 IMX1_DMA,
170 IMX21_DMA,
171 IMX27_DMA,
172 };
173
174 struct imxdma_engine {
175 struct device *dev;
176 struct device_dma_parameters dma_parms;
177 struct dma_device dma_device;
178 void __iomem *base;
179 struct clk *dma_ahb;
180 struct clk *dma_ipg;
181 spinlock_t lock;
182 struct imx_dma_2d_config slots_2d[IMX_DMA_2D_SLOTS];
183 struct imxdma_channel channel[IMX_DMA_CHANNELS];
184 enum imx_dma_type devtype;
185 unsigned int irq;
186 unsigned int irq_err;
187
188 };
189
190 struct imxdma_filter_data {
191 struct imxdma_engine *imxdma;
192 int request;
193 };
194
195 static const struct platform_device_id imx_dma_devtype[] = {
196 {
197 .name = "imx1-dma",
198 .driver_data = IMX1_DMA,
199 }, {
200 .name = "imx21-dma",
201 .driver_data = IMX21_DMA,
202 }, {
203 .name = "imx27-dma",
204 .driver_data = IMX27_DMA,
205 }, {
206
207 }
208 };
209 MODULE_DEVICE_TABLE(platform, imx_dma_devtype);
210
211 static const struct of_device_id imx_dma_of_dev_id[] = {
212 {
213 .compatible = "fsl,imx1-dma",
214 .data = &imx_dma_devtype[IMX1_DMA],
215 }, {
216 .compatible = "fsl,imx21-dma",
217 .data = &imx_dma_devtype[IMX21_DMA],
218 }, {
219 .compatible = "fsl,imx27-dma",
220 .data = &imx_dma_devtype[IMX27_DMA],
221 }, {
222
223 }
224 };
225 MODULE_DEVICE_TABLE(of, imx_dma_of_dev_id);
226
227 static inline int is_imx1_dma(struct imxdma_engine *imxdma)
228 {
229 return imxdma->devtype == IMX1_DMA;
230 }
231
232 static inline int is_imx27_dma(struct imxdma_engine *imxdma)
233 {
234 return imxdma->devtype == IMX27_DMA;
235 }
236
237 static struct imxdma_channel *to_imxdma_chan(struct dma_chan *chan)
238 {
239 return container_of(chan, struct imxdma_channel, chan);
240 }
241
242 static inline bool imxdma_chan_is_doing_cyclic(struct imxdma_channel *imxdmac)
243 {
244 struct imxdma_desc *desc;
245
246 if (!list_empty(&imxdmac->ld_active)) {
247 desc = list_first_entry(&imxdmac->ld_active, struct imxdma_desc,
248 node);
249 if (desc->type == IMXDMA_DESC_CYCLIC)
250 return true;
251 }
252 return false;
253 }
254
255
256
257 static void imx_dmav1_writel(struct imxdma_engine *imxdma, unsigned val,
258 unsigned offset)
259 {
260 __raw_writel(val, imxdma->base + offset);
261 }
262
263 static unsigned imx_dmav1_readl(struct imxdma_engine *imxdma, unsigned offset)
264 {
265 return __raw_readl(imxdma->base + offset);
266 }
267
268 static int imxdma_hw_chain(struct imxdma_channel *imxdmac)
269 {
270 struct imxdma_engine *imxdma = imxdmac->imxdma;
271
272 if (is_imx27_dma(imxdma))
273 return imxdmac->hw_chaining;
274 else
275 return 0;
276 }
277
278
279
280
281 static inline void imxdma_sg_next(struct imxdma_desc *d)
282 {
283 struct imxdma_channel *imxdmac = to_imxdma_chan(d->desc.chan);
284 struct imxdma_engine *imxdma = imxdmac->imxdma;
285 struct scatterlist *sg = d->sg;
286 size_t now;
287
288 now = min_t(size_t, d->len, sg_dma_len(sg));
289 if (d->len != IMX_DMA_LENGTH_LOOP)
290 d->len -= now;
291
292 if (d->direction == DMA_DEV_TO_MEM)
293 imx_dmav1_writel(imxdma, sg->dma_address,
294 DMA_DAR(imxdmac->channel));
295 else
296 imx_dmav1_writel(imxdma, sg->dma_address,
297 DMA_SAR(imxdmac->channel));
298
299 imx_dmav1_writel(imxdma, now, DMA_CNTR(imxdmac->channel));
300
301 dev_dbg(imxdma->dev, " %s channel: %d dst 0x%08x, src 0x%08x, "
302 "size 0x%08x\n", __func__, imxdmac->channel,
303 imx_dmav1_readl(imxdma, DMA_DAR(imxdmac->channel)),
304 imx_dmav1_readl(imxdma, DMA_SAR(imxdmac->channel)),
305 imx_dmav1_readl(imxdma, DMA_CNTR(imxdmac->channel)));
306 }
307
308 static void imxdma_enable_hw(struct imxdma_desc *d)
309 {
310 struct imxdma_channel *imxdmac = to_imxdma_chan(d->desc.chan);
311 struct imxdma_engine *imxdma = imxdmac->imxdma;
312 int channel = imxdmac->channel;
313 unsigned long flags;
314
315 dev_dbg(imxdma->dev, "%s channel %d\n", __func__, channel);
316
317 local_irq_save(flags);
318
319 imx_dmav1_writel(imxdma, 1 << channel, DMA_DISR);
320 imx_dmav1_writel(imxdma, imx_dmav1_readl(imxdma, DMA_DIMR) &
321 ~(1 << channel), DMA_DIMR);
322 imx_dmav1_writel(imxdma, imx_dmav1_readl(imxdma, DMA_CCR(channel)) |
323 CCR_CEN | CCR_ACRPT, DMA_CCR(channel));
324
325 if (!is_imx1_dma(imxdma) &&
326 d->sg && imxdma_hw_chain(imxdmac)) {
327 d->sg = sg_next(d->sg);
328 if (d->sg) {
329 u32 tmp;
330 imxdma_sg_next(d);
331 tmp = imx_dmav1_readl(imxdma, DMA_CCR(channel));
332 imx_dmav1_writel(imxdma, tmp | CCR_RPT | CCR_ACRPT,
333 DMA_CCR(channel));
334 }
335 }
336
337 local_irq_restore(flags);
338 }
339
340 static void imxdma_disable_hw(struct imxdma_channel *imxdmac)
341 {
342 struct imxdma_engine *imxdma = imxdmac->imxdma;
343 int channel = imxdmac->channel;
344 unsigned long flags;
345
346 dev_dbg(imxdma->dev, "%s channel %d\n", __func__, channel);
347
348 if (imxdma_hw_chain(imxdmac))
349 del_timer(&imxdmac->watchdog);
350
351 local_irq_save(flags);
352 imx_dmav1_writel(imxdma, imx_dmav1_readl(imxdma, DMA_DIMR) |
353 (1 << channel), DMA_DIMR);
354 imx_dmav1_writel(imxdma, imx_dmav1_readl(imxdma, DMA_CCR(channel)) &
355 ~CCR_CEN, DMA_CCR(channel));
356 imx_dmav1_writel(imxdma, 1 << channel, DMA_DISR);
357 local_irq_restore(flags);
358 }
359
360 static void imxdma_watchdog(struct timer_list *t)
361 {
362 struct imxdma_channel *imxdmac = from_timer(imxdmac, t, watchdog);
363 struct imxdma_engine *imxdma = imxdmac->imxdma;
364 int channel = imxdmac->channel;
365
366 imx_dmav1_writel(imxdma, 0, DMA_CCR(channel));
367
368
369 tasklet_schedule(&imxdmac->dma_tasklet);
370 dev_dbg(imxdma->dev, "channel %d: watchdog timeout!\n",
371 imxdmac->channel);
372 }
373
374 static irqreturn_t imxdma_err_handler(int irq, void *dev_id)
375 {
376 struct imxdma_engine *imxdma = dev_id;
377 unsigned int err_mask;
378 int i, disr;
379 int errcode;
380
381 disr = imx_dmav1_readl(imxdma, DMA_DISR);
382
383 err_mask = imx_dmav1_readl(imxdma, DMA_DBTOSR) |
384 imx_dmav1_readl(imxdma, DMA_DRTOSR) |
385 imx_dmav1_readl(imxdma, DMA_DSESR) |
386 imx_dmav1_readl(imxdma, DMA_DBOSR);
387
388 if (!err_mask)
389 return IRQ_HANDLED;
390
391 imx_dmav1_writel(imxdma, disr & err_mask, DMA_DISR);
392
393 for (i = 0; i < IMX_DMA_CHANNELS; i++) {
394 if (!(err_mask & (1 << i)))
395 continue;
396 errcode = 0;
397
398 if (imx_dmav1_readl(imxdma, DMA_DBTOSR) & (1 << i)) {
399 imx_dmav1_writel(imxdma, 1 << i, DMA_DBTOSR);
400 errcode |= IMX_DMA_ERR_BURST;
401 }
402 if (imx_dmav1_readl(imxdma, DMA_DRTOSR) & (1 << i)) {
403 imx_dmav1_writel(imxdma, 1 << i, DMA_DRTOSR);
404 errcode |= IMX_DMA_ERR_REQUEST;
405 }
406 if (imx_dmav1_readl(imxdma, DMA_DSESR) & (1 << i)) {
407 imx_dmav1_writel(imxdma, 1 << i, DMA_DSESR);
408 errcode |= IMX_DMA_ERR_TRANSFER;
409 }
410 if (imx_dmav1_readl(imxdma, DMA_DBOSR) & (1 << i)) {
411 imx_dmav1_writel(imxdma, 1 << i, DMA_DBOSR);
412 errcode |= IMX_DMA_ERR_BUFFER;
413 }
414
415 tasklet_schedule(&imxdma->channel[i].dma_tasklet);
416
417 dev_warn(imxdma->dev,
418 "DMA timeout on channel %d -%s%s%s%s\n", i,
419 errcode & IMX_DMA_ERR_BURST ? " burst" : "",
420 errcode & IMX_DMA_ERR_REQUEST ? " request" : "",
421 errcode & IMX_DMA_ERR_TRANSFER ? " transfer" : "",
422 errcode & IMX_DMA_ERR_BUFFER ? " buffer" : "");
423 }
424 return IRQ_HANDLED;
425 }
426
427 static void dma_irq_handle_channel(struct imxdma_channel *imxdmac)
428 {
429 struct imxdma_engine *imxdma = imxdmac->imxdma;
430 int chno = imxdmac->channel;
431 struct imxdma_desc *desc;
432 unsigned long flags;
433
434 spin_lock_irqsave(&imxdma->lock, flags);
435 if (list_empty(&imxdmac->ld_active)) {
436 spin_unlock_irqrestore(&imxdma->lock, flags);
437 goto out;
438 }
439
440 desc = list_first_entry(&imxdmac->ld_active,
441 struct imxdma_desc,
442 node);
443 spin_unlock_irqrestore(&imxdma->lock, flags);
444
445 if (desc->sg) {
446 u32 tmp;
447 desc->sg = sg_next(desc->sg);
448
449 if (desc->sg) {
450 imxdma_sg_next(desc);
451
452 tmp = imx_dmav1_readl(imxdma, DMA_CCR(chno));
453
454 if (imxdma_hw_chain(imxdmac)) {
455
456
457
458 mod_timer(&imxdmac->watchdog,
459 jiffies + msecs_to_jiffies(500));
460
461 tmp |= CCR_CEN | CCR_RPT | CCR_ACRPT;
462 imx_dmav1_writel(imxdma, tmp, DMA_CCR(chno));
463 } else {
464 imx_dmav1_writel(imxdma, tmp & ~CCR_CEN,
465 DMA_CCR(chno));
466 tmp |= CCR_CEN;
467 }
468
469 imx_dmav1_writel(imxdma, tmp, DMA_CCR(chno));
470
471 if (imxdma_chan_is_doing_cyclic(imxdmac))
472
473 tasklet_schedule(&imxdmac->dma_tasklet);
474
475 return;
476 }
477
478 if (imxdma_hw_chain(imxdmac)) {
479 del_timer(&imxdmac->watchdog);
480 return;
481 }
482 }
483
484 out:
485 imx_dmav1_writel(imxdma, 0, DMA_CCR(chno));
486
487 tasklet_schedule(&imxdmac->dma_tasklet);
488 }
489
490 static irqreturn_t dma_irq_handler(int irq, void *dev_id)
491 {
492 struct imxdma_engine *imxdma = dev_id;
493 int i, disr;
494
495 if (!is_imx1_dma(imxdma))
496 imxdma_err_handler(irq, dev_id);
497
498 disr = imx_dmav1_readl(imxdma, DMA_DISR);
499
500 dev_dbg(imxdma->dev, "%s called, disr=0x%08x\n", __func__, disr);
501
502 imx_dmav1_writel(imxdma, disr, DMA_DISR);
503 for (i = 0; i < IMX_DMA_CHANNELS; i++) {
504 if (disr & (1 << i))
505 dma_irq_handle_channel(&imxdma->channel[i]);
506 }
507
508 return IRQ_HANDLED;
509 }
510
511 static int imxdma_xfer_desc(struct imxdma_desc *d)
512 {
513 struct imxdma_channel *imxdmac = to_imxdma_chan(d->desc.chan);
514 struct imxdma_engine *imxdma = imxdmac->imxdma;
515 int slot = -1;
516 int i;
517
518
519 switch (d->type) {
520 case IMXDMA_DESC_INTERLEAVED:
521
522 for (i = 0; i < IMX_DMA_2D_SLOTS; i++) {
523 if ((imxdma->slots_2d[i].count > 0) &&
524 ((imxdma->slots_2d[i].xsr != d->x) ||
525 (imxdma->slots_2d[i].ysr != d->y) ||
526 (imxdma->slots_2d[i].wsr != d->w)))
527 continue;
528 slot = i;
529 break;
530 }
531 if (slot < 0)
532 return -EBUSY;
533
534 imxdma->slots_2d[slot].xsr = d->x;
535 imxdma->slots_2d[slot].ysr = d->y;
536 imxdma->slots_2d[slot].wsr = d->w;
537 imxdma->slots_2d[slot].count++;
538
539 imxdmac->slot_2d = slot;
540 imxdmac->enabled_2d = true;
541
542 if (slot == IMX_DMA_2D_SLOT_A) {
543 d->config_mem &= ~CCR_MSEL_B;
544 d->config_port &= ~CCR_MSEL_B;
545 imx_dmav1_writel(imxdma, d->x, DMA_XSRA);
546 imx_dmav1_writel(imxdma, d->y, DMA_YSRA);
547 imx_dmav1_writel(imxdma, d->w, DMA_WSRA);
548 } else {
549 d->config_mem |= CCR_MSEL_B;
550 d->config_port |= CCR_MSEL_B;
551 imx_dmav1_writel(imxdma, d->x, DMA_XSRB);
552 imx_dmav1_writel(imxdma, d->y, DMA_YSRB);
553 imx_dmav1_writel(imxdma, d->w, DMA_WSRB);
554 }
555
556
557
558
559
560 case IMXDMA_DESC_MEMCPY:
561 imx_dmav1_writel(imxdma, d->src, DMA_SAR(imxdmac->channel));
562 imx_dmav1_writel(imxdma, d->dest, DMA_DAR(imxdmac->channel));
563 imx_dmav1_writel(imxdma, d->config_mem | (d->config_port << 2),
564 DMA_CCR(imxdmac->channel));
565
566 imx_dmav1_writel(imxdma, d->len, DMA_CNTR(imxdmac->channel));
567
568 dev_dbg(imxdma->dev,
569 "%s channel: %d dest=0x%08llx src=0x%08llx dma_length=%zu\n",
570 __func__, imxdmac->channel,
571 (unsigned long long)d->dest,
572 (unsigned long long)d->src, d->len);
573
574 break;
575
576 case IMXDMA_DESC_CYCLIC:
577 case IMXDMA_DESC_SLAVE_SG:
578 if (d->direction == DMA_DEV_TO_MEM) {
579 imx_dmav1_writel(imxdma, imxdmac->per_address,
580 DMA_SAR(imxdmac->channel));
581 imx_dmav1_writel(imxdma, imxdmac->ccr_from_device,
582 DMA_CCR(imxdmac->channel));
583
584 dev_dbg(imxdma->dev,
585 "%s channel: %d sg=%p sgcount=%d total length=%zu dev_addr=0x%08llx (dev2mem)\n",
586 __func__, imxdmac->channel,
587 d->sg, d->sgcount, d->len,
588 (unsigned long long)imxdmac->per_address);
589 } else if (d->direction == DMA_MEM_TO_DEV) {
590 imx_dmav1_writel(imxdma, imxdmac->per_address,
591 DMA_DAR(imxdmac->channel));
592 imx_dmav1_writel(imxdma, imxdmac->ccr_to_device,
593 DMA_CCR(imxdmac->channel));
594
595 dev_dbg(imxdma->dev,
596 "%s channel: %d sg=%p sgcount=%d total length=%zu dev_addr=0x%08llx (mem2dev)\n",
597 __func__, imxdmac->channel,
598 d->sg, d->sgcount, d->len,
599 (unsigned long long)imxdmac->per_address);
600 } else {
601 dev_err(imxdma->dev, "%s channel: %d bad dma mode\n",
602 __func__, imxdmac->channel);
603 return -EINVAL;
604 }
605
606 imxdma_sg_next(d);
607
608 break;
609 default:
610 return -EINVAL;
611 }
612 imxdma_enable_hw(d);
613 return 0;
614 }
615
616 static void imxdma_tasklet(unsigned long data)
617 {
618 struct imxdma_channel *imxdmac = (void *)data;
619 struct imxdma_engine *imxdma = imxdmac->imxdma;
620 struct imxdma_desc *desc, *next_desc;
621 unsigned long flags;
622
623 spin_lock_irqsave(&imxdma->lock, flags);
624
625 if (list_empty(&imxdmac->ld_active)) {
626
627 spin_unlock_irqrestore(&imxdma->lock, flags);
628 return;
629 }
630 desc = list_first_entry(&imxdmac->ld_active, struct imxdma_desc, node);
631
632
633
634
635
636 if (imxdma_chan_is_doing_cyclic(imxdmac))
637 goto out;
638 else
639 dma_cookie_complete(&desc->desc);
640
641
642 if (imxdmac->enabled_2d) {
643 imxdma->slots_2d[imxdmac->slot_2d].count--;
644 imxdmac->enabled_2d = false;
645 }
646
647 list_move_tail(imxdmac->ld_active.next, &imxdmac->ld_free);
648
649 if (!list_empty(&imxdmac->ld_queue)) {
650 next_desc = list_first_entry(&imxdmac->ld_queue,
651 struct imxdma_desc, node);
652 list_move_tail(imxdmac->ld_queue.next, &imxdmac->ld_active);
653 if (imxdma_xfer_desc(next_desc) < 0)
654 dev_warn(imxdma->dev, "%s: channel: %d couldn't xfer desc\n",
655 __func__, imxdmac->channel);
656 }
657 out:
658 spin_unlock_irqrestore(&imxdma->lock, flags);
659
660 dmaengine_desc_get_callback_invoke(&desc->desc, NULL);
661 }
662
663 static int imxdma_terminate_all(struct dma_chan *chan)
664 {
665 struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
666 struct imxdma_engine *imxdma = imxdmac->imxdma;
667 unsigned long flags;
668
669 imxdma_disable_hw(imxdmac);
670
671 spin_lock_irqsave(&imxdma->lock, flags);
672 list_splice_tail_init(&imxdmac->ld_active, &imxdmac->ld_free);
673 list_splice_tail_init(&imxdmac->ld_queue, &imxdmac->ld_free);
674 spin_unlock_irqrestore(&imxdma->lock, flags);
675 return 0;
676 }
677
678 static int imxdma_config_write(struct dma_chan *chan,
679 struct dma_slave_config *dmaengine_cfg,
680 enum dma_transfer_direction direction)
681 {
682 struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
683 struct imxdma_engine *imxdma = imxdmac->imxdma;
684 unsigned int mode = 0;
685
686 if (direction == DMA_DEV_TO_MEM) {
687 imxdmac->per_address = dmaengine_cfg->src_addr;
688 imxdmac->watermark_level = dmaengine_cfg->src_maxburst;
689 imxdmac->word_size = dmaengine_cfg->src_addr_width;
690 } else {
691 imxdmac->per_address = dmaengine_cfg->dst_addr;
692 imxdmac->watermark_level = dmaengine_cfg->dst_maxburst;
693 imxdmac->word_size = dmaengine_cfg->dst_addr_width;
694 }
695
696 switch (imxdmac->word_size) {
697 case DMA_SLAVE_BUSWIDTH_1_BYTE:
698 mode = IMX_DMA_MEMSIZE_8;
699 break;
700 case DMA_SLAVE_BUSWIDTH_2_BYTES:
701 mode = IMX_DMA_MEMSIZE_16;
702 break;
703 default:
704 case DMA_SLAVE_BUSWIDTH_4_BYTES:
705 mode = IMX_DMA_MEMSIZE_32;
706 break;
707 }
708
709 imxdmac->hw_chaining = 0;
710
711 imxdmac->ccr_from_device = (mode | IMX_DMA_TYPE_FIFO) |
712 ((IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR) << 2) |
713 CCR_REN;
714 imxdmac->ccr_to_device =
715 (IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR) |
716 ((mode | IMX_DMA_TYPE_FIFO) << 2) | CCR_REN;
717 imx_dmav1_writel(imxdma, imxdmac->dma_request,
718 DMA_RSSR(imxdmac->channel));
719
720
721 imx_dmav1_writel(imxdma, imxdmac->watermark_level *
722 imxdmac->word_size, DMA_BLR(imxdmac->channel));
723
724 return 0;
725 }
726
727 static int imxdma_config(struct dma_chan *chan,
728 struct dma_slave_config *dmaengine_cfg)
729 {
730 struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
731
732 memcpy(&imxdmac->config, dmaengine_cfg, sizeof(*dmaengine_cfg));
733
734 return 0;
735 }
736
737 static enum dma_status imxdma_tx_status(struct dma_chan *chan,
738 dma_cookie_t cookie,
739 struct dma_tx_state *txstate)
740 {
741 return dma_cookie_status(chan, cookie, txstate);
742 }
743
744 static dma_cookie_t imxdma_tx_submit(struct dma_async_tx_descriptor *tx)
745 {
746 struct imxdma_channel *imxdmac = to_imxdma_chan(tx->chan);
747 struct imxdma_engine *imxdma = imxdmac->imxdma;
748 dma_cookie_t cookie;
749 unsigned long flags;
750
751 spin_lock_irqsave(&imxdma->lock, flags);
752 list_move_tail(imxdmac->ld_free.next, &imxdmac->ld_queue);
753 cookie = dma_cookie_assign(tx);
754 spin_unlock_irqrestore(&imxdma->lock, flags);
755
756 return cookie;
757 }
758
759 static int imxdma_alloc_chan_resources(struct dma_chan *chan)
760 {
761 struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
762 struct imx_dma_data *data = chan->private;
763
764 if (data != NULL)
765 imxdmac->dma_request = data->dma_request;
766
767 while (imxdmac->descs_allocated < IMXDMA_MAX_CHAN_DESCRIPTORS) {
768 struct imxdma_desc *desc;
769
770 desc = kzalloc(sizeof(*desc), GFP_KERNEL);
771 if (!desc)
772 break;
773 memset(&desc->desc, 0, sizeof(struct dma_async_tx_descriptor));
774 dma_async_tx_descriptor_init(&desc->desc, chan);
775 desc->desc.tx_submit = imxdma_tx_submit;
776
777 desc->desc.flags = DMA_CTRL_ACK;
778 desc->status = DMA_COMPLETE;
779
780 list_add_tail(&desc->node, &imxdmac->ld_free);
781 imxdmac->descs_allocated++;
782 }
783
784 if (!imxdmac->descs_allocated)
785 return -ENOMEM;
786
787 return imxdmac->descs_allocated;
788 }
789
790 static void imxdma_free_chan_resources(struct dma_chan *chan)
791 {
792 struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
793 struct imxdma_engine *imxdma = imxdmac->imxdma;
794 struct imxdma_desc *desc, *_desc;
795 unsigned long flags;
796
797 spin_lock_irqsave(&imxdma->lock, flags);
798
799 imxdma_disable_hw(imxdmac);
800 list_splice_tail_init(&imxdmac->ld_active, &imxdmac->ld_free);
801 list_splice_tail_init(&imxdmac->ld_queue, &imxdmac->ld_free);
802
803 spin_unlock_irqrestore(&imxdma->lock, flags);
804
805 list_for_each_entry_safe(desc, _desc, &imxdmac->ld_free, node) {
806 kfree(desc);
807 imxdmac->descs_allocated--;
808 }
809 INIT_LIST_HEAD(&imxdmac->ld_free);
810
811 kfree(imxdmac->sg_list);
812 imxdmac->sg_list = NULL;
813 }
814
815 static struct dma_async_tx_descriptor *imxdma_prep_slave_sg(
816 struct dma_chan *chan, struct scatterlist *sgl,
817 unsigned int sg_len, enum dma_transfer_direction direction,
818 unsigned long flags, void *context)
819 {
820 struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
821 struct scatterlist *sg;
822 int i, dma_length = 0;
823 struct imxdma_desc *desc;
824
825 if (list_empty(&imxdmac->ld_free) ||
826 imxdma_chan_is_doing_cyclic(imxdmac))
827 return NULL;
828
829 desc = list_first_entry(&imxdmac->ld_free, struct imxdma_desc, node);
830
831 for_each_sg(sgl, sg, sg_len, i) {
832 dma_length += sg_dma_len(sg);
833 }
834
835 switch (imxdmac->word_size) {
836 case DMA_SLAVE_BUSWIDTH_4_BYTES:
837 if (sg_dma_len(sgl) & 3 || sgl->dma_address & 3)
838 return NULL;
839 break;
840 case DMA_SLAVE_BUSWIDTH_2_BYTES:
841 if (sg_dma_len(sgl) & 1 || sgl->dma_address & 1)
842 return NULL;
843 break;
844 case DMA_SLAVE_BUSWIDTH_1_BYTE:
845 break;
846 default:
847 return NULL;
848 }
849
850 desc->type = IMXDMA_DESC_SLAVE_SG;
851 desc->sg = sgl;
852 desc->sgcount = sg_len;
853 desc->len = dma_length;
854 desc->direction = direction;
855 if (direction == DMA_DEV_TO_MEM) {
856 desc->src = imxdmac->per_address;
857 } else {
858 desc->dest = imxdmac->per_address;
859 }
860 desc->desc.callback = NULL;
861 desc->desc.callback_param = NULL;
862
863 return &desc->desc;
864 }
865
866 static struct dma_async_tx_descriptor *imxdma_prep_dma_cyclic(
867 struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len,
868 size_t period_len, enum dma_transfer_direction direction,
869 unsigned long flags)
870 {
871 struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
872 struct imxdma_engine *imxdma = imxdmac->imxdma;
873 struct imxdma_desc *desc;
874 int i;
875 unsigned int periods = buf_len / period_len;
876
877 dev_dbg(imxdma->dev, "%s channel: %d buf_len=%zu period_len=%zu\n",
878 __func__, imxdmac->channel, buf_len, period_len);
879
880 if (list_empty(&imxdmac->ld_free) ||
881 imxdma_chan_is_doing_cyclic(imxdmac))
882 return NULL;
883
884 desc = list_first_entry(&imxdmac->ld_free, struct imxdma_desc, node);
885
886 kfree(imxdmac->sg_list);
887
888 imxdmac->sg_list = kcalloc(periods + 1,
889 sizeof(struct scatterlist), GFP_ATOMIC);
890 if (!imxdmac->sg_list)
891 return NULL;
892
893 sg_init_table(imxdmac->sg_list, periods);
894
895 for (i = 0; i < periods; i++) {
896 sg_assign_page(&imxdmac->sg_list[i], NULL);
897 imxdmac->sg_list[i].offset = 0;
898 imxdmac->sg_list[i].dma_address = dma_addr;
899 sg_dma_len(&imxdmac->sg_list[i]) = period_len;
900 dma_addr += period_len;
901 }
902
903
904 sg_chain(imxdmac->sg_list, periods + 1, imxdmac->sg_list);
905
906 desc->type = IMXDMA_DESC_CYCLIC;
907 desc->sg = imxdmac->sg_list;
908 desc->sgcount = periods;
909 desc->len = IMX_DMA_LENGTH_LOOP;
910 desc->direction = direction;
911 if (direction == DMA_DEV_TO_MEM) {
912 desc->src = imxdmac->per_address;
913 } else {
914 desc->dest = imxdmac->per_address;
915 }
916 desc->desc.callback = NULL;
917 desc->desc.callback_param = NULL;
918
919 imxdma_config_write(chan, &imxdmac->config, direction);
920
921 return &desc->desc;
922 }
923
924 static struct dma_async_tx_descriptor *imxdma_prep_dma_memcpy(
925 struct dma_chan *chan, dma_addr_t dest,
926 dma_addr_t src, size_t len, unsigned long flags)
927 {
928 struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
929 struct imxdma_engine *imxdma = imxdmac->imxdma;
930 struct imxdma_desc *desc;
931
932 dev_dbg(imxdma->dev, "%s channel: %d src=0x%llx dst=0x%llx len=%zu\n",
933 __func__, imxdmac->channel, (unsigned long long)src,
934 (unsigned long long)dest, len);
935
936 if (list_empty(&imxdmac->ld_free) ||
937 imxdma_chan_is_doing_cyclic(imxdmac))
938 return NULL;
939
940 desc = list_first_entry(&imxdmac->ld_free, struct imxdma_desc, node);
941
942 desc->type = IMXDMA_DESC_MEMCPY;
943 desc->src = src;
944 desc->dest = dest;
945 desc->len = len;
946 desc->direction = DMA_MEM_TO_MEM;
947 desc->config_port = IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR;
948 desc->config_mem = IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR;
949 desc->desc.callback = NULL;
950 desc->desc.callback_param = NULL;
951
952 return &desc->desc;
953 }
954
955 static struct dma_async_tx_descriptor *imxdma_prep_dma_interleaved(
956 struct dma_chan *chan, struct dma_interleaved_template *xt,
957 unsigned long flags)
958 {
959 struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
960 struct imxdma_engine *imxdma = imxdmac->imxdma;
961 struct imxdma_desc *desc;
962
963 dev_dbg(imxdma->dev, "%s channel: %d src_start=0x%llx dst_start=0x%llx\n"
964 " src_sgl=%s dst_sgl=%s numf=%zu frame_size=%zu\n", __func__,
965 imxdmac->channel, (unsigned long long)xt->src_start,
966 (unsigned long long) xt->dst_start,
967 xt->src_sgl ? "true" : "false", xt->dst_sgl ? "true" : "false",
968 xt->numf, xt->frame_size);
969
970 if (list_empty(&imxdmac->ld_free) ||
971 imxdma_chan_is_doing_cyclic(imxdmac))
972 return NULL;
973
974 if (xt->frame_size != 1 || xt->numf <= 0 || xt->dir != DMA_MEM_TO_MEM)
975 return NULL;
976
977 desc = list_first_entry(&imxdmac->ld_free, struct imxdma_desc, node);
978
979 desc->type = IMXDMA_DESC_INTERLEAVED;
980 desc->src = xt->src_start;
981 desc->dest = xt->dst_start;
982 desc->x = xt->sgl[0].size;
983 desc->y = xt->numf;
984 desc->w = xt->sgl[0].icg + desc->x;
985 desc->len = desc->x * desc->y;
986 desc->direction = DMA_MEM_TO_MEM;
987 desc->config_port = IMX_DMA_MEMSIZE_32;
988 desc->config_mem = IMX_DMA_MEMSIZE_32;
989 if (xt->src_sgl)
990 desc->config_mem |= IMX_DMA_TYPE_2D;
991 if (xt->dst_sgl)
992 desc->config_port |= IMX_DMA_TYPE_2D;
993 desc->desc.callback = NULL;
994 desc->desc.callback_param = NULL;
995
996 return &desc->desc;
997 }
998
999 static void imxdma_issue_pending(struct dma_chan *chan)
1000 {
1001 struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
1002 struct imxdma_engine *imxdma = imxdmac->imxdma;
1003 struct imxdma_desc *desc;
1004 unsigned long flags;
1005
1006 spin_lock_irqsave(&imxdma->lock, flags);
1007 if (list_empty(&imxdmac->ld_active) &&
1008 !list_empty(&imxdmac->ld_queue)) {
1009 desc = list_first_entry(&imxdmac->ld_queue,
1010 struct imxdma_desc, node);
1011
1012 if (imxdma_xfer_desc(desc) < 0) {
1013 dev_warn(imxdma->dev,
1014 "%s: channel: %d couldn't issue DMA xfer\n",
1015 __func__, imxdmac->channel);
1016 } else {
1017 list_move_tail(imxdmac->ld_queue.next,
1018 &imxdmac->ld_active);
1019 }
1020 }
1021 spin_unlock_irqrestore(&imxdma->lock, flags);
1022 }
1023
1024 static bool imxdma_filter_fn(struct dma_chan *chan, void *param)
1025 {
1026 struct imxdma_filter_data *fdata = param;
1027 struct imxdma_channel *imxdma_chan = to_imxdma_chan(chan);
1028
1029 if (chan->device->dev != fdata->imxdma->dev)
1030 return false;
1031
1032 imxdma_chan->dma_request = fdata->request;
1033 chan->private = NULL;
1034
1035 return true;
1036 }
1037
1038 static struct dma_chan *imxdma_xlate(struct of_phandle_args *dma_spec,
1039 struct of_dma *ofdma)
1040 {
1041 int count = dma_spec->args_count;
1042 struct imxdma_engine *imxdma = ofdma->of_dma_data;
1043 struct imxdma_filter_data fdata = {
1044 .imxdma = imxdma,
1045 };
1046
1047 if (count != 1)
1048 return NULL;
1049
1050 fdata.request = dma_spec->args[0];
1051
1052 return dma_request_channel(imxdma->dma_device.cap_mask,
1053 imxdma_filter_fn, &fdata);
1054 }
1055
1056 static int __init imxdma_probe(struct platform_device *pdev)
1057 {
1058 struct imxdma_engine *imxdma;
1059 struct resource *res;
1060 const struct of_device_id *of_id;
1061 int ret, i;
1062 int irq, irq_err;
1063
1064 of_id = of_match_device(imx_dma_of_dev_id, &pdev->dev);
1065 if (of_id)
1066 pdev->id_entry = of_id->data;
1067
1068 imxdma = devm_kzalloc(&pdev->dev, sizeof(*imxdma), GFP_KERNEL);
1069 if (!imxdma)
1070 return -ENOMEM;
1071
1072 imxdma->dev = &pdev->dev;
1073 imxdma->devtype = pdev->id_entry->driver_data;
1074
1075 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1076 imxdma->base = devm_ioremap_resource(&pdev->dev, res);
1077 if (IS_ERR(imxdma->base))
1078 return PTR_ERR(imxdma->base);
1079
1080 irq = platform_get_irq(pdev, 0);
1081 if (irq < 0)
1082 return irq;
1083
1084 imxdma->dma_ipg = devm_clk_get(&pdev->dev, "ipg");
1085 if (IS_ERR(imxdma->dma_ipg))
1086 return PTR_ERR(imxdma->dma_ipg);
1087
1088 imxdma->dma_ahb = devm_clk_get(&pdev->dev, "ahb");
1089 if (IS_ERR(imxdma->dma_ahb))
1090 return PTR_ERR(imxdma->dma_ahb);
1091
1092 ret = clk_prepare_enable(imxdma->dma_ipg);
1093 if (ret)
1094 return ret;
1095 ret = clk_prepare_enable(imxdma->dma_ahb);
1096 if (ret)
1097 goto disable_dma_ipg_clk;
1098
1099
1100 imx_dmav1_writel(imxdma, DCR_DRST, DMA_DCR);
1101
1102 if (is_imx1_dma(imxdma)) {
1103 ret = devm_request_irq(&pdev->dev, irq,
1104 dma_irq_handler, 0, "DMA", imxdma);
1105 if (ret) {
1106 dev_warn(imxdma->dev, "Can't register IRQ for DMA\n");
1107 goto disable_dma_ahb_clk;
1108 }
1109 imxdma->irq = irq;
1110
1111 irq_err = platform_get_irq(pdev, 1);
1112 if (irq_err < 0) {
1113 ret = irq_err;
1114 goto disable_dma_ahb_clk;
1115 }
1116
1117 ret = devm_request_irq(&pdev->dev, irq_err,
1118 imxdma_err_handler, 0, "DMA", imxdma);
1119 if (ret) {
1120 dev_warn(imxdma->dev, "Can't register ERRIRQ for DMA\n");
1121 goto disable_dma_ahb_clk;
1122 }
1123 imxdma->irq_err = irq_err;
1124 }
1125
1126
1127 imx_dmav1_writel(imxdma, DCR_DEN, DMA_DCR);
1128
1129
1130 imx_dmav1_writel(imxdma, (1 << IMX_DMA_CHANNELS) - 1, DMA_DISR);
1131
1132
1133 imx_dmav1_writel(imxdma, (1 << IMX_DMA_CHANNELS) - 1, DMA_DIMR);
1134
1135 INIT_LIST_HEAD(&imxdma->dma_device.channels);
1136
1137 dma_cap_set(DMA_SLAVE, imxdma->dma_device.cap_mask);
1138 dma_cap_set(DMA_CYCLIC, imxdma->dma_device.cap_mask);
1139 dma_cap_set(DMA_MEMCPY, imxdma->dma_device.cap_mask);
1140 dma_cap_set(DMA_INTERLEAVE, imxdma->dma_device.cap_mask);
1141
1142
1143 for (i = 0; i < IMX_DMA_2D_SLOTS; i++)
1144 imxdma->slots_2d[i].count = 0;
1145
1146 spin_lock_init(&imxdma->lock);
1147
1148
1149 for (i = 0; i < IMX_DMA_CHANNELS; i++) {
1150 struct imxdma_channel *imxdmac = &imxdma->channel[i];
1151
1152 if (!is_imx1_dma(imxdma)) {
1153 ret = devm_request_irq(&pdev->dev, irq + i,
1154 dma_irq_handler, 0, "DMA", imxdma);
1155 if (ret) {
1156 dev_warn(imxdma->dev, "Can't register IRQ %d "
1157 "for DMA channel %d\n",
1158 irq + i, i);
1159 goto disable_dma_ahb_clk;
1160 }
1161
1162 imxdmac->irq = irq + i;
1163 timer_setup(&imxdmac->watchdog, imxdma_watchdog, 0);
1164 }
1165
1166 imxdmac->imxdma = imxdma;
1167
1168 INIT_LIST_HEAD(&imxdmac->ld_queue);
1169 INIT_LIST_HEAD(&imxdmac->ld_free);
1170 INIT_LIST_HEAD(&imxdmac->ld_active);
1171
1172 tasklet_init(&imxdmac->dma_tasklet, imxdma_tasklet,
1173 (unsigned long)imxdmac);
1174 imxdmac->chan.device = &imxdma->dma_device;
1175 dma_cookie_init(&imxdmac->chan);
1176 imxdmac->channel = i;
1177
1178
1179 list_add_tail(&imxdmac->chan.device_node,
1180 &imxdma->dma_device.channels);
1181 }
1182
1183 imxdma->dma_device.dev = &pdev->dev;
1184
1185 imxdma->dma_device.device_alloc_chan_resources = imxdma_alloc_chan_resources;
1186 imxdma->dma_device.device_free_chan_resources = imxdma_free_chan_resources;
1187 imxdma->dma_device.device_tx_status = imxdma_tx_status;
1188 imxdma->dma_device.device_prep_slave_sg = imxdma_prep_slave_sg;
1189 imxdma->dma_device.device_prep_dma_cyclic = imxdma_prep_dma_cyclic;
1190 imxdma->dma_device.device_prep_dma_memcpy = imxdma_prep_dma_memcpy;
1191 imxdma->dma_device.device_prep_interleaved_dma = imxdma_prep_dma_interleaved;
1192 imxdma->dma_device.device_config = imxdma_config;
1193 imxdma->dma_device.device_terminate_all = imxdma_terminate_all;
1194 imxdma->dma_device.device_issue_pending = imxdma_issue_pending;
1195
1196 platform_set_drvdata(pdev, imxdma);
1197
1198 imxdma->dma_device.copy_align = DMAENGINE_ALIGN_4_BYTES;
1199 imxdma->dma_device.dev->dma_parms = &imxdma->dma_parms;
1200 dma_set_max_seg_size(imxdma->dma_device.dev, 0xffffff);
1201
1202 ret = dma_async_device_register(&imxdma->dma_device);
1203 if (ret) {
1204 dev_err(&pdev->dev, "unable to register\n");
1205 goto disable_dma_ahb_clk;
1206 }
1207
1208 if (pdev->dev.of_node) {
1209 ret = of_dma_controller_register(pdev->dev.of_node,
1210 imxdma_xlate, imxdma);
1211 if (ret) {
1212 dev_err(&pdev->dev, "unable to register of_dma_controller\n");
1213 goto err_of_dma_controller;
1214 }
1215 }
1216
1217 return 0;
1218
1219 err_of_dma_controller:
1220 dma_async_device_unregister(&imxdma->dma_device);
1221 disable_dma_ahb_clk:
1222 clk_disable_unprepare(imxdma->dma_ahb);
1223 disable_dma_ipg_clk:
1224 clk_disable_unprepare(imxdma->dma_ipg);
1225 return ret;
1226 }
1227
1228 static void imxdma_free_irq(struct platform_device *pdev, struct imxdma_engine *imxdma)
1229 {
1230 int i;
1231
1232 if (is_imx1_dma(imxdma)) {
1233 disable_irq(imxdma->irq);
1234 disable_irq(imxdma->irq_err);
1235 }
1236
1237 for (i = 0; i < IMX_DMA_CHANNELS; i++) {
1238 struct imxdma_channel *imxdmac = &imxdma->channel[i];
1239
1240 if (!is_imx1_dma(imxdma))
1241 disable_irq(imxdmac->irq);
1242
1243 tasklet_kill(&imxdmac->dma_tasklet);
1244 }
1245 }
1246
1247 static int imxdma_remove(struct platform_device *pdev)
1248 {
1249 struct imxdma_engine *imxdma = platform_get_drvdata(pdev);
1250
1251 imxdma_free_irq(pdev, imxdma);
1252
1253 dma_async_device_unregister(&imxdma->dma_device);
1254
1255 if (pdev->dev.of_node)
1256 of_dma_controller_free(pdev->dev.of_node);
1257
1258 clk_disable_unprepare(imxdma->dma_ipg);
1259 clk_disable_unprepare(imxdma->dma_ahb);
1260
1261 return 0;
1262 }
1263
1264 static struct platform_driver imxdma_driver = {
1265 .driver = {
1266 .name = "imx-dma",
1267 .of_match_table = imx_dma_of_dev_id,
1268 },
1269 .id_table = imx_dma_devtype,
1270 .remove = imxdma_remove,
1271 };
1272
1273 static int __init imxdma_module_init(void)
1274 {
1275 return platform_driver_probe(&imxdma_driver, imxdma_probe);
1276 }
1277 subsys_initcall(imxdma_module_init);
1278
1279 MODULE_AUTHOR("Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>");
1280 MODULE_DESCRIPTION("i.MX dma driver");
1281 MODULE_LICENSE("GPL");