1 // SPDX-License-Identifier: GPL-2.0+
2 //
3 // drivers/dma/imx-dma.c
4 //
5 // This file contains a driver for the Freescale i.MX DMA engine
6 // found on i.MX1/21/27
7 //
8 // Copyright 2010 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>
9 // Copyright 2012 Javier Martin, Vista Silicon <javier.martin@vista-silicon.com>
10
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 /* Control Register */
53 #define DMA_DISR 0x04 /* Interrupt status Register */
54 #define DMA_DIMR 0x08 /* Interrupt mask Register */
55 #define DMA_DBTOSR 0x0c /* Burst timeout status Register */
56 #define DMA_DRTOSR 0x10 /* Request timeout Register */
57 #define DMA_DSESR 0x14 /* Transfer Error Status Register */
58 #define DMA_DBOSR 0x18 /* Buffer overflow status Register */
59 #define DMA_DBTOCR 0x1c /* Burst timeout control Register */
60 #define DMA_WSRA 0x40 /* W-Size Register A */
61 #define DMA_XSRA 0x44 /* X-Size Register A */
62 #define DMA_YSRA 0x48 /* Y-Size Register A */
63 #define DMA_WSRB 0x4c /* W-Size Register B */
64 #define DMA_XSRB 0x50 /* X-Size Register B */
65 #define DMA_YSRB 0x54 /* Y-Size Register B */
66 #define DMA_SAR(x) (0x80 + ((x) << 6)) /* Source Address Registers */
67 #define DMA_DAR(x) (0x84 + ((x) << 6)) /* Destination Address Registers */
68 #define DMA_CNTR(x) (0x88 + ((x) << 6)) /* Count Registers */
69 #define DMA_CCR(x) (0x8c + ((x) << 6)) /* Control Registers */
70 #define DMA_RSSR(x) (0x90 + ((x) << 6)) /* Request source select Registers */
71 #define DMA_BLR(x) (0x94 + ((x) << 6)) /* Burst length Registers */
72 #define DMA_RTOR(x) (0x98 + ((x) << 6)) /* Request timeout Registers */
73 #define DMA_BUCR(x) (0x98 + ((x) << 6)) /* Bus Utilization Registers */
74 #define DMA_CCNR(x) (0x9C + ((x) << 6)) /* Channel counter Registers */
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 /* For memcpy and interleaved */
130 unsigned int config_port;
131 unsigned int config_mem;
132 /* For interleaved transfers */
133 unsigned int x;
134 unsigned int y;
135 unsigned int w;
136 /* For slave sg and cyclic */
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 /* sentinel */
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 /* sentinel */
223 }
224 };
225 MODULE_DEVICE_TABLE(of, imx_dma_of_dev_id);
226
is_imx1_dma(struct imxdma_engine * imxdma)227 static inline int is_imx1_dma(struct imxdma_engine *imxdma)
228 {
229 return imxdma->devtype == IMX1_DMA;
230 }
231
is_imx27_dma(struct imxdma_engine * imxdma)232 static inline int is_imx27_dma(struct imxdma_engine *imxdma)
233 {
234 return imxdma->devtype == IMX27_DMA;
235 }
236
to_imxdma_chan(struct dma_chan * chan)237 static struct imxdma_channel *to_imxdma_chan(struct dma_chan *chan)
238 {
239 return container_of(chan, struct imxdma_channel, chan);
240 }
241
imxdma_chan_is_doing_cyclic(struct imxdma_channel * imxdmac)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
imx_dmav1_writel(struct imxdma_engine * imxdma,unsigned val,unsigned offset)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
imx_dmav1_readl(struct imxdma_engine * imxdma,unsigned offset)263 static unsigned imx_dmav1_readl(struct imxdma_engine *imxdma, unsigned offset)
264 {
265 return __raw_readl(imxdma->base + offset);
266 }
267
imxdma_hw_chain(struct imxdma_channel * imxdmac)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 * imxdma_sg_next - prepare next chunk for scatter-gather DMA emulation
280 */
imxdma_sg_next(struct imxdma_desc * d)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
imxdma_enable_hw(struct imxdma_desc * d)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
imxdma_disable_hw(struct imxdma_channel * imxdmac)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
imxdma_watchdog(struct timer_list * t)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 /* Tasklet watchdog error handler */
369 tasklet_schedule(&imxdmac->dma_tasklet);
370 dev_dbg(imxdma->dev, "channel %d: watchdog timeout!\n",
371 imxdmac->channel);
372 }
373
imxdma_err_handler(int irq,void * dev_id)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 /* Tasklet error handler */
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
dma_irq_handle_channel(struct imxdma_channel * imxdmac)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 /* FIXME: The timeout should probably be
456 * configurable
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 /* Tasklet progression */
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 /* Tasklet irq */
487 tasklet_schedule(&imxdmac->dma_tasklet);
488 }
489
dma_irq_handler(int irq,void * dev_id)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
imxdma_xfer_desc(struct imxdma_desc * d)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 /* Configure and enable */
519 switch (d->type) {
520 case IMXDMA_DESC_INTERLEAVED:
521 /* Try to get a free 2D slot */
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 * We fall-through here intentionally, since a 2D transfer is
557 * similar to MEMCPY just adding the 2D slot configuration.
558 */
559 /* Fall through */
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 /* Cyclic transfer is the same as slave_sg with special sg configuration. */
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
imxdma_tasklet(unsigned long data)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 /* Someone might have called terminate all */
627 spin_unlock_irqrestore(&imxdma->lock, flags);
628 return;
629 }
630 desc = list_first_entry(&imxdmac->ld_active, struct imxdma_desc, node);
631
632 /* If we are dealing with a cyclic descriptor, keep it on ld_active
633 * and dont mark the descriptor as complete.
634 * Only in non-cyclic cases it would be marked as complete
635 */
636 if (imxdma_chan_is_doing_cyclic(imxdmac))
637 goto out;
638 else
639 dma_cookie_complete(&desc->desc);
640
641 /* Free 2D slot if it was an interleaved transfer */
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
imxdma_terminate_all(struct dma_chan * chan)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
imxdma_config_write(struct dma_chan * chan,struct dma_slave_config * dmaengine_cfg,enum dma_transfer_direction direction)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 /* Set burst length */
721 imx_dmav1_writel(imxdma, imxdmac->watermark_level *
722 imxdmac->word_size, DMA_BLR(imxdmac->channel));
723
724 return 0;
725 }
726
imxdma_config(struct dma_chan * chan,struct dma_slave_config * dmaengine_cfg)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
imxdma_tx_status(struct dma_chan * chan,dma_cookie_t cookie,struct dma_tx_state * txstate)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
imxdma_tx_submit(struct dma_async_tx_descriptor * tx)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
imxdma_alloc_chan_resources(struct dma_chan * chan)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 /* txd.flags will be overwritten in prep funcs */
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
imxdma_free_chan_resources(struct dma_chan * chan)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
imxdma_prep_slave_sg(struct dma_chan * chan,struct scatterlist * sgl,unsigned int sg_len,enum dma_transfer_direction direction,unsigned long flags,void * context)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 imxdma_config_write(chan, &imxdmac->config, direction);
836
837 switch (imxdmac->word_size) {
838 case DMA_SLAVE_BUSWIDTH_4_BYTES:
839 if (sg_dma_len(sgl) & 3 || sgl->dma_address & 3)
840 return NULL;
841 break;
842 case DMA_SLAVE_BUSWIDTH_2_BYTES:
843 if (sg_dma_len(sgl) & 1 || sgl->dma_address & 1)
844 return NULL;
845 break;
846 case DMA_SLAVE_BUSWIDTH_1_BYTE:
847 break;
848 default:
849 return NULL;
850 }
851
852 desc->type = IMXDMA_DESC_SLAVE_SG;
853 desc->sg = sgl;
854 desc->sgcount = sg_len;
855 desc->len = dma_length;
856 desc->direction = direction;
857 if (direction == DMA_DEV_TO_MEM) {
858 desc->src = imxdmac->per_address;
859 } else {
860 desc->dest = imxdmac->per_address;
861 }
862 desc->desc.callback = NULL;
863 desc->desc.callback_param = NULL;
864
865 return &desc->desc;
866 }
867
imxdma_prep_dma_cyclic(struct dma_chan * chan,dma_addr_t dma_addr,size_t buf_len,size_t period_len,enum dma_transfer_direction direction,unsigned long flags)868 static struct dma_async_tx_descriptor *imxdma_prep_dma_cyclic(
869 struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len,
870 size_t period_len, enum dma_transfer_direction direction,
871 unsigned long flags)
872 {
873 struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
874 struct imxdma_engine *imxdma = imxdmac->imxdma;
875 struct imxdma_desc *desc;
876 int i;
877 unsigned int periods = buf_len / period_len;
878
879 dev_dbg(imxdma->dev, "%s channel: %d buf_len=%zu period_len=%zu\n",
880 __func__, imxdmac->channel, buf_len, period_len);
881
882 if (list_empty(&imxdmac->ld_free) ||
883 imxdma_chan_is_doing_cyclic(imxdmac))
884 return NULL;
885
886 desc = list_first_entry(&imxdmac->ld_free, struct imxdma_desc, node);
887
888 kfree(imxdmac->sg_list);
889
890 imxdmac->sg_list = kcalloc(periods + 1,
891 sizeof(struct scatterlist), GFP_ATOMIC);
892 if (!imxdmac->sg_list)
893 return NULL;
894
895 sg_init_table(imxdmac->sg_list, periods);
896
897 for (i = 0; i < periods; i++) {
898 sg_assign_page(&imxdmac->sg_list[i], NULL);
899 imxdmac->sg_list[i].offset = 0;
900 imxdmac->sg_list[i].dma_address = dma_addr;
901 sg_dma_len(&imxdmac->sg_list[i]) = period_len;
902 dma_addr += period_len;
903 }
904
905 /* close the loop */
906 sg_chain(imxdmac->sg_list, periods + 1, imxdmac->sg_list);
907
908 desc->type = IMXDMA_DESC_CYCLIC;
909 desc->sg = imxdmac->sg_list;
910 desc->sgcount = periods;
911 desc->len = IMX_DMA_LENGTH_LOOP;
912 desc->direction = direction;
913 if (direction == DMA_DEV_TO_MEM) {
914 desc->src = imxdmac->per_address;
915 } else {
916 desc->dest = imxdmac->per_address;
917 }
918 desc->desc.callback = NULL;
919 desc->desc.callback_param = NULL;
920
921 imxdma_config_write(chan, &imxdmac->config, direction);
922
923 return &desc->desc;
924 }
925
imxdma_prep_dma_memcpy(struct dma_chan * chan,dma_addr_t dest,dma_addr_t src,size_t len,unsigned long flags)926 static struct dma_async_tx_descriptor *imxdma_prep_dma_memcpy(
927 struct dma_chan *chan, dma_addr_t dest,
928 dma_addr_t src, size_t len, unsigned long flags)
929 {
930 struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
931 struct imxdma_engine *imxdma = imxdmac->imxdma;
932 struct imxdma_desc *desc;
933
934 dev_dbg(imxdma->dev, "%s channel: %d src=0x%llx dst=0x%llx len=%zu\n",
935 __func__, imxdmac->channel, (unsigned long long)src,
936 (unsigned long long)dest, len);
937
938 if (list_empty(&imxdmac->ld_free) ||
939 imxdma_chan_is_doing_cyclic(imxdmac))
940 return NULL;
941
942 desc = list_first_entry(&imxdmac->ld_free, struct imxdma_desc, node);
943
944 desc->type = IMXDMA_DESC_MEMCPY;
945 desc->src = src;
946 desc->dest = dest;
947 desc->len = len;
948 desc->direction = DMA_MEM_TO_MEM;
949 desc->config_port = IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR;
950 desc->config_mem = IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR;
951 desc->desc.callback = NULL;
952 desc->desc.callback_param = NULL;
953
954 return &desc->desc;
955 }
956
imxdma_prep_dma_interleaved(struct dma_chan * chan,struct dma_interleaved_template * xt,unsigned long flags)957 static struct dma_async_tx_descriptor *imxdma_prep_dma_interleaved(
958 struct dma_chan *chan, struct dma_interleaved_template *xt,
959 unsigned long flags)
960 {
961 struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
962 struct imxdma_engine *imxdma = imxdmac->imxdma;
963 struct imxdma_desc *desc;
964
965 dev_dbg(imxdma->dev, "%s channel: %d src_start=0x%llx dst_start=0x%llx\n"
966 " src_sgl=%s dst_sgl=%s numf=%zu frame_size=%zu\n", __func__,
967 imxdmac->channel, (unsigned long long)xt->src_start,
968 (unsigned long long) xt->dst_start,
969 xt->src_sgl ? "true" : "false", xt->dst_sgl ? "true" : "false",
970 xt->numf, xt->frame_size);
971
972 if (list_empty(&imxdmac->ld_free) ||
973 imxdma_chan_is_doing_cyclic(imxdmac))
974 return NULL;
975
976 if (xt->frame_size != 1 || xt->numf <= 0 || xt->dir != DMA_MEM_TO_MEM)
977 return NULL;
978
979 desc = list_first_entry(&imxdmac->ld_free, struct imxdma_desc, node);
980
981 desc->type = IMXDMA_DESC_INTERLEAVED;
982 desc->src = xt->src_start;
983 desc->dest = xt->dst_start;
984 desc->x = xt->sgl[0].size;
985 desc->y = xt->numf;
986 desc->w = xt->sgl[0].icg + desc->x;
987 desc->len = desc->x * desc->y;
988 desc->direction = DMA_MEM_TO_MEM;
989 desc->config_port = IMX_DMA_MEMSIZE_32;
990 desc->config_mem = IMX_DMA_MEMSIZE_32;
991 if (xt->src_sgl)
992 desc->config_mem |= IMX_DMA_TYPE_2D;
993 if (xt->dst_sgl)
994 desc->config_port |= IMX_DMA_TYPE_2D;
995 desc->desc.callback = NULL;
996 desc->desc.callback_param = NULL;
997
998 return &desc->desc;
999 }
1000
imxdma_issue_pending(struct dma_chan * chan)1001 static void imxdma_issue_pending(struct dma_chan *chan)
1002 {
1003 struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
1004 struct imxdma_engine *imxdma = imxdmac->imxdma;
1005 struct imxdma_desc *desc;
1006 unsigned long flags;
1007
1008 spin_lock_irqsave(&imxdma->lock, flags);
1009 if (list_empty(&imxdmac->ld_active) &&
1010 !list_empty(&imxdmac->ld_queue)) {
1011 desc = list_first_entry(&imxdmac->ld_queue,
1012 struct imxdma_desc, node);
1013
1014 if (imxdma_xfer_desc(desc) < 0) {
1015 dev_warn(imxdma->dev,
1016 "%s: channel: %d couldn't issue DMA xfer\n",
1017 __func__, imxdmac->channel);
1018 } else {
1019 list_move_tail(imxdmac->ld_queue.next,
1020 &imxdmac->ld_active);
1021 }
1022 }
1023 spin_unlock_irqrestore(&imxdma->lock, flags);
1024 }
1025
imxdma_filter_fn(struct dma_chan * chan,void * param)1026 static bool imxdma_filter_fn(struct dma_chan *chan, void *param)
1027 {
1028 struct imxdma_filter_data *fdata = param;
1029 struct imxdma_channel *imxdma_chan = to_imxdma_chan(chan);
1030
1031 if (chan->device->dev != fdata->imxdma->dev)
1032 return false;
1033
1034 imxdma_chan->dma_request = fdata->request;
1035 chan->private = NULL;
1036
1037 return true;
1038 }
1039
imxdma_xlate(struct of_phandle_args * dma_spec,struct of_dma * ofdma)1040 static struct dma_chan *imxdma_xlate(struct of_phandle_args *dma_spec,
1041 struct of_dma *ofdma)
1042 {
1043 int count = dma_spec->args_count;
1044 struct imxdma_engine *imxdma = ofdma->of_dma_data;
1045 struct imxdma_filter_data fdata = {
1046 .imxdma = imxdma,
1047 };
1048
1049 if (count != 1)
1050 return NULL;
1051
1052 fdata.request = dma_spec->args[0];
1053
1054 return dma_request_channel(imxdma->dma_device.cap_mask,
1055 imxdma_filter_fn, &fdata);
1056 }
1057
imxdma_probe(struct platform_device * pdev)1058 static int __init imxdma_probe(struct platform_device *pdev)
1059 {
1060 struct imxdma_engine *imxdma;
1061 struct resource *res;
1062 const struct of_device_id *of_id;
1063 int ret, i;
1064 int irq, irq_err;
1065
1066 of_id = of_match_device(imx_dma_of_dev_id, &pdev->dev);
1067 if (of_id)
1068 pdev->id_entry = of_id->data;
1069
1070 imxdma = devm_kzalloc(&pdev->dev, sizeof(*imxdma), GFP_KERNEL);
1071 if (!imxdma)
1072 return -ENOMEM;
1073
1074 imxdma->dev = &pdev->dev;
1075 imxdma->devtype = pdev->id_entry->driver_data;
1076
1077 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1078 imxdma->base = devm_ioremap_resource(&pdev->dev, res);
1079 if (IS_ERR(imxdma->base))
1080 return PTR_ERR(imxdma->base);
1081
1082 irq = platform_get_irq(pdev, 0);
1083 if (irq < 0)
1084 return irq;
1085
1086 imxdma->dma_ipg = devm_clk_get(&pdev->dev, "ipg");
1087 if (IS_ERR(imxdma->dma_ipg))
1088 return PTR_ERR(imxdma->dma_ipg);
1089
1090 imxdma->dma_ahb = devm_clk_get(&pdev->dev, "ahb");
1091 if (IS_ERR(imxdma->dma_ahb))
1092 return PTR_ERR(imxdma->dma_ahb);
1093
1094 ret = clk_prepare_enable(imxdma->dma_ipg);
1095 if (ret)
1096 return ret;
1097 ret = clk_prepare_enable(imxdma->dma_ahb);
1098 if (ret)
1099 goto disable_dma_ipg_clk;
1100
1101 /* reset DMA module */
1102 imx_dmav1_writel(imxdma, DCR_DRST, DMA_DCR);
1103
1104 if (is_imx1_dma(imxdma)) {
1105 ret = devm_request_irq(&pdev->dev, irq,
1106 dma_irq_handler, 0, "DMA", imxdma);
1107 if (ret) {
1108 dev_warn(imxdma->dev, "Can't register IRQ for DMA\n");
1109 goto disable_dma_ahb_clk;
1110 }
1111 imxdma->irq = irq;
1112
1113 irq_err = platform_get_irq(pdev, 1);
1114 if (irq_err < 0) {
1115 ret = irq_err;
1116 goto disable_dma_ahb_clk;
1117 }
1118
1119 ret = devm_request_irq(&pdev->dev, irq_err,
1120 imxdma_err_handler, 0, "DMA", imxdma);
1121 if (ret) {
1122 dev_warn(imxdma->dev, "Can't register ERRIRQ for DMA\n");
1123 goto disable_dma_ahb_clk;
1124 }
1125 imxdma->irq_err = irq_err;
1126 }
1127
1128 /* enable DMA module */
1129 imx_dmav1_writel(imxdma, DCR_DEN, DMA_DCR);
1130
1131 /* clear all interrupts */
1132 imx_dmav1_writel(imxdma, (1 << IMX_DMA_CHANNELS) - 1, DMA_DISR);
1133
1134 /* disable interrupts */
1135 imx_dmav1_writel(imxdma, (1 << IMX_DMA_CHANNELS) - 1, DMA_DIMR);
1136
1137 INIT_LIST_HEAD(&imxdma->dma_device.channels);
1138
1139 dma_cap_set(DMA_SLAVE, imxdma->dma_device.cap_mask);
1140 dma_cap_set(DMA_CYCLIC, imxdma->dma_device.cap_mask);
1141 dma_cap_set(DMA_MEMCPY, imxdma->dma_device.cap_mask);
1142 dma_cap_set(DMA_INTERLEAVE, imxdma->dma_device.cap_mask);
1143
1144 /* Initialize 2D global parameters */
1145 for (i = 0; i < IMX_DMA_2D_SLOTS; i++)
1146 imxdma->slots_2d[i].count = 0;
1147
1148 spin_lock_init(&imxdma->lock);
1149
1150 /* Initialize channel parameters */
1151 for (i = 0; i < IMX_DMA_CHANNELS; i++) {
1152 struct imxdma_channel *imxdmac = &imxdma->channel[i];
1153
1154 if (!is_imx1_dma(imxdma)) {
1155 ret = devm_request_irq(&pdev->dev, irq + i,
1156 dma_irq_handler, 0, "DMA", imxdma);
1157 if (ret) {
1158 dev_warn(imxdma->dev, "Can't register IRQ %d "
1159 "for DMA channel %d\n",
1160 irq + i, i);
1161 goto disable_dma_ahb_clk;
1162 }
1163
1164 imxdmac->irq = irq + i;
1165 timer_setup(&imxdmac->watchdog, imxdma_watchdog, 0);
1166 }
1167
1168 imxdmac->imxdma = imxdma;
1169
1170 INIT_LIST_HEAD(&imxdmac->ld_queue);
1171 INIT_LIST_HEAD(&imxdmac->ld_free);
1172 INIT_LIST_HEAD(&imxdmac->ld_active);
1173
1174 tasklet_init(&imxdmac->dma_tasklet, imxdma_tasklet,
1175 (unsigned long)imxdmac);
1176 imxdmac->chan.device = &imxdma->dma_device;
1177 dma_cookie_init(&imxdmac->chan);
1178 imxdmac->channel = i;
1179
1180 /* Add the channel to the DMAC list */
1181 list_add_tail(&imxdmac->chan.device_node,
1182 &imxdma->dma_device.channels);
1183 }
1184
1185 imxdma->dma_device.dev = &pdev->dev;
1186
1187 imxdma->dma_device.device_alloc_chan_resources = imxdma_alloc_chan_resources;
1188 imxdma->dma_device.device_free_chan_resources = imxdma_free_chan_resources;
1189 imxdma->dma_device.device_tx_status = imxdma_tx_status;
1190 imxdma->dma_device.device_prep_slave_sg = imxdma_prep_slave_sg;
1191 imxdma->dma_device.device_prep_dma_cyclic = imxdma_prep_dma_cyclic;
1192 imxdma->dma_device.device_prep_dma_memcpy = imxdma_prep_dma_memcpy;
1193 imxdma->dma_device.device_prep_interleaved_dma = imxdma_prep_dma_interleaved;
1194 imxdma->dma_device.device_config = imxdma_config;
1195 imxdma->dma_device.device_terminate_all = imxdma_terminate_all;
1196 imxdma->dma_device.device_issue_pending = imxdma_issue_pending;
1197
1198 platform_set_drvdata(pdev, imxdma);
1199
1200 imxdma->dma_device.copy_align = DMAENGINE_ALIGN_4_BYTES;
1201 imxdma->dma_device.dev->dma_parms = &imxdma->dma_parms;
1202 dma_set_max_seg_size(imxdma->dma_device.dev, 0xffffff);
1203
1204 ret = dma_async_device_register(&imxdma->dma_device);
1205 if (ret) {
1206 dev_err(&pdev->dev, "unable to register\n");
1207 goto disable_dma_ahb_clk;
1208 }
1209
1210 if (pdev->dev.of_node) {
1211 ret = of_dma_controller_register(pdev->dev.of_node,
1212 imxdma_xlate, imxdma);
1213 if (ret) {
1214 dev_err(&pdev->dev, "unable to register of_dma_controller\n");
1215 goto err_of_dma_controller;
1216 }
1217 }
1218
1219 return 0;
1220
1221 err_of_dma_controller:
1222 dma_async_device_unregister(&imxdma->dma_device);
1223 disable_dma_ahb_clk:
1224 clk_disable_unprepare(imxdma->dma_ahb);
1225 disable_dma_ipg_clk:
1226 clk_disable_unprepare(imxdma->dma_ipg);
1227 return ret;
1228 }
1229
imxdma_free_irq(struct platform_device * pdev,struct imxdma_engine * imxdma)1230 static void imxdma_free_irq(struct platform_device *pdev, struct imxdma_engine *imxdma)
1231 {
1232 int i;
1233
1234 if (is_imx1_dma(imxdma)) {
1235 disable_irq(imxdma->irq);
1236 disable_irq(imxdma->irq_err);
1237 }
1238
1239 for (i = 0; i < IMX_DMA_CHANNELS; i++) {
1240 struct imxdma_channel *imxdmac = &imxdma->channel[i];
1241
1242 if (!is_imx1_dma(imxdma))
1243 disable_irq(imxdmac->irq);
1244
1245 tasklet_kill(&imxdmac->dma_tasklet);
1246 }
1247 }
1248
imxdma_remove(struct platform_device * pdev)1249 static int imxdma_remove(struct platform_device *pdev)
1250 {
1251 struct imxdma_engine *imxdma = platform_get_drvdata(pdev);
1252
1253 imxdma_free_irq(pdev, imxdma);
1254
1255 dma_async_device_unregister(&imxdma->dma_device);
1256
1257 if (pdev->dev.of_node)
1258 of_dma_controller_free(pdev->dev.of_node);
1259
1260 clk_disable_unprepare(imxdma->dma_ipg);
1261 clk_disable_unprepare(imxdma->dma_ahb);
1262
1263 return 0;
1264 }
1265
1266 static struct platform_driver imxdma_driver = {
1267 .driver = {
1268 .name = "imx-dma",
1269 .of_match_table = imx_dma_of_dev_id,
1270 },
1271 .id_table = imx_dma_devtype,
1272 .remove = imxdma_remove,
1273 };
1274
imxdma_module_init(void)1275 static int __init imxdma_module_init(void)
1276 {
1277 return platform_driver_probe(&imxdma_driver, imxdma_probe);
1278 }
1279 subsys_initcall(imxdma_module_init);
1280
1281 MODULE_AUTHOR("Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>");
1282 MODULE_DESCRIPTION("i.MX dma driver");
1283 MODULE_LICENSE("GPL");
1284