1 /*
2 * drivers/dma/imx-dma.c
3 *
4 * This file contains a driver for the Freescale i.MX DMA engine
5 * found on i.MX1/21/27
6 *
7 * Copyright 2010 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>
8 * Copyright 2012 Javier Martin, Vista Silicon <javier.martin@vista-silicon.com>
9 *
10 * The code contained herein is licensed under the GNU General Public
11 * License. You may obtain a copy of the GNU General Public License
12 * Version 2 or later at the following locations:
13 *
14 * http://www.opensource.org/licenses/gpl-license.html
15 * http://www.gnu.org/copyleft/gpl.html
16 */
17 #include <linux/init.h>
18 #include <linux/types.h>
19 #include <linux/mm.h>
20 #include <linux/interrupt.h>
21 #include <linux/spinlock.h>
22 #include <linux/device.h>
23 #include <linux/dma-mapping.h>
24 #include <linux/slab.h>
25 #include <linux/platform_device.h>
26 #include <linux/clk.h>
27 #include <linux/dmaengine.h>
28 #include <linux/module.h>
29
30 #include <asm/irq.h>
31 #include <mach/dma.h>
32 #include <mach/hardware.h>
33
34 #include "dmaengine.h"
35 #define IMXDMA_MAX_CHAN_DESCRIPTORS 16
36 #define IMX_DMA_CHANNELS 16
37
38 #define IMX_DMA_2D_SLOTS 2
39 #define IMX_DMA_2D_SLOT_A 0
40 #define IMX_DMA_2D_SLOT_B 1
41
42 #define IMX_DMA_LENGTH_LOOP ((unsigned int)-1)
43 #define IMX_DMA_MEMSIZE_32 (0 << 4)
44 #define IMX_DMA_MEMSIZE_8 (1 << 4)
45 #define IMX_DMA_MEMSIZE_16 (2 << 4)
46 #define IMX_DMA_TYPE_LINEAR (0 << 10)
47 #define IMX_DMA_TYPE_2D (1 << 10)
48 #define IMX_DMA_TYPE_FIFO (2 << 10)
49
50 #define IMX_DMA_ERR_BURST (1 << 0)
51 #define IMX_DMA_ERR_REQUEST (1 << 1)
52 #define IMX_DMA_ERR_TRANSFER (1 << 2)
53 #define IMX_DMA_ERR_BUFFER (1 << 3)
54 #define IMX_DMA_ERR_TIMEOUT (1 << 4)
55
56 #define DMA_DCR 0x00 /* Control Register */
57 #define DMA_DISR 0x04 /* Interrupt status Register */
58 #define DMA_DIMR 0x08 /* Interrupt mask Register */
59 #define DMA_DBTOSR 0x0c /* Burst timeout status Register */
60 #define DMA_DRTOSR 0x10 /* Request timeout Register */
61 #define DMA_DSESR 0x14 /* Transfer Error Status Register */
62 #define DMA_DBOSR 0x18 /* Buffer overflow status Register */
63 #define DMA_DBTOCR 0x1c /* Burst timeout control Register */
64 #define DMA_WSRA 0x40 /* W-Size Register A */
65 #define DMA_XSRA 0x44 /* X-Size Register A */
66 #define DMA_YSRA 0x48 /* Y-Size Register A */
67 #define DMA_WSRB 0x4c /* W-Size Register B */
68 #define DMA_XSRB 0x50 /* X-Size Register B */
69 #define DMA_YSRB 0x54 /* Y-Size Register B */
70 #define DMA_SAR(x) (0x80 + ((x) << 6)) /* Source Address Registers */
71 #define DMA_DAR(x) (0x84 + ((x) << 6)) /* Destination Address Registers */
72 #define DMA_CNTR(x) (0x88 + ((x) << 6)) /* Count Registers */
73 #define DMA_CCR(x) (0x8c + ((x) << 6)) /* Control Registers */
74 #define DMA_RSSR(x) (0x90 + ((x) << 6)) /* Request source select Registers */
75 #define DMA_BLR(x) (0x94 + ((x) << 6)) /* Burst length Registers */
76 #define DMA_RTOR(x) (0x98 + ((x) << 6)) /* Request timeout Registers */
77 #define DMA_BUCR(x) (0x98 + ((x) << 6)) /* Bus Utilization Registers */
78 #define DMA_CCNR(x) (0x9C + ((x) << 6)) /* Channel counter Registers */
79
80 #define DCR_DRST (1<<1)
81 #define DCR_DEN (1<<0)
82 #define DBTOCR_EN (1<<15)
83 #define DBTOCR_CNT(x) ((x) & 0x7fff)
84 #define CNTR_CNT(x) ((x) & 0xffffff)
85 #define CCR_ACRPT (1<<14)
86 #define CCR_DMOD_LINEAR (0x0 << 12)
87 #define CCR_DMOD_2D (0x1 << 12)
88 #define CCR_DMOD_FIFO (0x2 << 12)
89 #define CCR_DMOD_EOBFIFO (0x3 << 12)
90 #define CCR_SMOD_LINEAR (0x0 << 10)
91 #define CCR_SMOD_2D (0x1 << 10)
92 #define CCR_SMOD_FIFO (0x2 << 10)
93 #define CCR_SMOD_EOBFIFO (0x3 << 10)
94 #define CCR_MDIR_DEC (1<<9)
95 #define CCR_MSEL_B (1<<8)
96 #define CCR_DSIZ_32 (0x0 << 6)
97 #define CCR_DSIZ_8 (0x1 << 6)
98 #define CCR_DSIZ_16 (0x2 << 6)
99 #define CCR_SSIZ_32 (0x0 << 4)
100 #define CCR_SSIZ_8 (0x1 << 4)
101 #define CCR_SSIZ_16 (0x2 << 4)
102 #define CCR_REN (1<<3)
103 #define CCR_RPT (1<<2)
104 #define CCR_FRC (1<<1)
105 #define CCR_CEN (1<<0)
106 #define RTOR_EN (1<<15)
107 #define RTOR_CLK (1<<14)
108 #define RTOR_PSC (1<<13)
109
110 enum imxdma_prep_type {
111 IMXDMA_DESC_MEMCPY,
112 IMXDMA_DESC_INTERLEAVED,
113 IMXDMA_DESC_SLAVE_SG,
114 IMXDMA_DESC_CYCLIC,
115 };
116
117 struct imx_dma_2d_config {
118 u16 xsr;
119 u16 ysr;
120 u16 wsr;
121 int count;
122 };
123
124 struct imxdma_desc {
125 struct list_head node;
126 struct dma_async_tx_descriptor desc;
127 enum dma_status status;
128 dma_addr_t src;
129 dma_addr_t dest;
130 size_t len;
131 enum dma_transfer_direction direction;
132 enum imxdma_prep_type type;
133 /* For memcpy and interleaved */
134 unsigned int config_port;
135 unsigned int config_mem;
136 /* For interleaved transfers */
137 unsigned int x;
138 unsigned int y;
139 unsigned int w;
140 /* For slave sg and cyclic */
141 struct scatterlist *sg;
142 unsigned int sgcount;
143 };
144
145 struct imxdma_channel {
146 int hw_chaining;
147 struct timer_list watchdog;
148 struct imxdma_engine *imxdma;
149 unsigned int channel;
150
151 struct tasklet_struct dma_tasklet;
152 struct list_head ld_free;
153 struct list_head ld_queue;
154 struct list_head ld_active;
155 int descs_allocated;
156 enum dma_slave_buswidth word_size;
157 dma_addr_t per_address;
158 u32 watermark_level;
159 struct dma_chan chan;
160 struct dma_async_tx_descriptor desc;
161 enum dma_status status;
162 int dma_request;
163 struct scatterlist *sg_list;
164 u32 ccr_from_device;
165 u32 ccr_to_device;
166 bool enabled_2d;
167 int slot_2d;
168 };
169
170 struct imxdma_engine {
171 struct device *dev;
172 struct device_dma_parameters dma_parms;
173 struct dma_device dma_device;
174 void __iomem *base;
175 struct clk *dma_clk;
176 spinlock_t lock;
177 struct imx_dma_2d_config slots_2d[IMX_DMA_2D_SLOTS];
178 struct imxdma_channel channel[IMX_DMA_CHANNELS];
179 };
180
to_imxdma_chan(struct dma_chan * chan)181 static struct imxdma_channel *to_imxdma_chan(struct dma_chan *chan)
182 {
183 return container_of(chan, struct imxdma_channel, chan);
184 }
185
imxdma_chan_is_doing_cyclic(struct imxdma_channel * imxdmac)186 static inline bool imxdma_chan_is_doing_cyclic(struct imxdma_channel *imxdmac)
187 {
188 struct imxdma_desc *desc;
189
190 if (!list_empty(&imxdmac->ld_active)) {
191 desc = list_first_entry(&imxdmac->ld_active, struct imxdma_desc,
192 node);
193 if (desc->type == IMXDMA_DESC_CYCLIC)
194 return true;
195 }
196 return false;
197 }
198
199
200
imx_dmav1_writel(struct imxdma_engine * imxdma,unsigned val,unsigned offset)201 static void imx_dmav1_writel(struct imxdma_engine *imxdma, unsigned val,
202 unsigned offset)
203 {
204 __raw_writel(val, imxdma->base + offset);
205 }
206
imx_dmav1_readl(struct imxdma_engine * imxdma,unsigned offset)207 static unsigned imx_dmav1_readl(struct imxdma_engine *imxdma, unsigned offset)
208 {
209 return __raw_readl(imxdma->base + offset);
210 }
211
imxdma_hw_chain(struct imxdma_channel * imxdmac)212 static int imxdma_hw_chain(struct imxdma_channel *imxdmac)
213 {
214 if (cpu_is_mx27())
215 return imxdmac->hw_chaining;
216 else
217 return 0;
218 }
219
220 /*
221 * imxdma_sg_next - prepare next chunk for scatter-gather DMA emulation
222 */
imxdma_sg_next(struct imxdma_desc * d)223 static inline int imxdma_sg_next(struct imxdma_desc *d)
224 {
225 struct imxdma_channel *imxdmac = to_imxdma_chan(d->desc.chan);
226 struct imxdma_engine *imxdma = imxdmac->imxdma;
227 struct scatterlist *sg = d->sg;
228 unsigned long now;
229
230 now = min(d->len, sg->length);
231 if (d->len != IMX_DMA_LENGTH_LOOP)
232 d->len -= now;
233
234 if (d->direction == DMA_DEV_TO_MEM)
235 imx_dmav1_writel(imxdma, sg->dma_address,
236 DMA_DAR(imxdmac->channel));
237 else
238 imx_dmav1_writel(imxdma, sg->dma_address,
239 DMA_SAR(imxdmac->channel));
240
241 imx_dmav1_writel(imxdma, now, DMA_CNTR(imxdmac->channel));
242
243 dev_dbg(imxdma->dev, " %s channel: %d dst 0x%08x, src 0x%08x, "
244 "size 0x%08x\n", __func__, imxdmac->channel,
245 imx_dmav1_readl(imxdma, DMA_DAR(imxdmac->channel)),
246 imx_dmav1_readl(imxdma, DMA_SAR(imxdmac->channel)),
247 imx_dmav1_readl(imxdma, DMA_CNTR(imxdmac->channel)));
248
249 return now;
250 }
251
imxdma_enable_hw(struct imxdma_desc * d)252 static void imxdma_enable_hw(struct imxdma_desc *d)
253 {
254 struct imxdma_channel *imxdmac = to_imxdma_chan(d->desc.chan);
255 struct imxdma_engine *imxdma = imxdmac->imxdma;
256 int channel = imxdmac->channel;
257 unsigned long flags;
258
259 dev_dbg(imxdma->dev, "%s channel %d\n", __func__, channel);
260
261 local_irq_save(flags);
262
263 imx_dmav1_writel(imxdma, 1 << channel, DMA_DISR);
264 imx_dmav1_writel(imxdma, imx_dmav1_readl(imxdma, DMA_DIMR) &
265 ~(1 << channel), DMA_DIMR);
266 imx_dmav1_writel(imxdma, imx_dmav1_readl(imxdma, DMA_CCR(channel)) |
267 CCR_CEN | CCR_ACRPT, DMA_CCR(channel));
268
269 if ((cpu_is_mx21() || cpu_is_mx27()) &&
270 d->sg && imxdma_hw_chain(imxdmac)) {
271 d->sg = sg_next(d->sg);
272 if (d->sg) {
273 u32 tmp;
274 imxdma_sg_next(d);
275 tmp = imx_dmav1_readl(imxdma, DMA_CCR(channel));
276 imx_dmav1_writel(imxdma, tmp | CCR_RPT | CCR_ACRPT,
277 DMA_CCR(channel));
278 }
279 }
280
281 local_irq_restore(flags);
282 }
283
imxdma_disable_hw(struct imxdma_channel * imxdmac)284 static void imxdma_disable_hw(struct imxdma_channel *imxdmac)
285 {
286 struct imxdma_engine *imxdma = imxdmac->imxdma;
287 int channel = imxdmac->channel;
288 unsigned long flags;
289
290 dev_dbg(imxdma->dev, "%s channel %d\n", __func__, channel);
291
292 if (imxdma_hw_chain(imxdmac))
293 del_timer(&imxdmac->watchdog);
294
295 local_irq_save(flags);
296 imx_dmav1_writel(imxdma, imx_dmav1_readl(imxdma, DMA_DIMR) |
297 (1 << channel), DMA_DIMR);
298 imx_dmav1_writel(imxdma, imx_dmav1_readl(imxdma, DMA_CCR(channel)) &
299 ~CCR_CEN, DMA_CCR(channel));
300 imx_dmav1_writel(imxdma, 1 << channel, DMA_DISR);
301 local_irq_restore(flags);
302 }
303
imxdma_watchdog(unsigned long data)304 static void imxdma_watchdog(unsigned long data)
305 {
306 struct imxdma_channel *imxdmac = (struct imxdma_channel *)data;
307 struct imxdma_engine *imxdma = imxdmac->imxdma;
308 int channel = imxdmac->channel;
309
310 imx_dmav1_writel(imxdma, 0, DMA_CCR(channel));
311
312 /* Tasklet watchdog error handler */
313 tasklet_schedule(&imxdmac->dma_tasklet);
314 dev_dbg(imxdma->dev, "channel %d: watchdog timeout!\n",
315 imxdmac->channel);
316 }
317
imxdma_err_handler(int irq,void * dev_id)318 static irqreturn_t imxdma_err_handler(int irq, void *dev_id)
319 {
320 struct imxdma_engine *imxdma = dev_id;
321 unsigned int err_mask;
322 int i, disr;
323 int errcode;
324
325 disr = imx_dmav1_readl(imxdma, DMA_DISR);
326
327 err_mask = imx_dmav1_readl(imxdma, DMA_DBTOSR) |
328 imx_dmav1_readl(imxdma, DMA_DRTOSR) |
329 imx_dmav1_readl(imxdma, DMA_DSESR) |
330 imx_dmav1_readl(imxdma, DMA_DBOSR);
331
332 if (!err_mask)
333 return IRQ_HANDLED;
334
335 imx_dmav1_writel(imxdma, disr & err_mask, DMA_DISR);
336
337 for (i = 0; i < IMX_DMA_CHANNELS; i++) {
338 if (!(err_mask & (1 << i)))
339 continue;
340 errcode = 0;
341
342 if (imx_dmav1_readl(imxdma, DMA_DBTOSR) & (1 << i)) {
343 imx_dmav1_writel(imxdma, 1 << i, DMA_DBTOSR);
344 errcode |= IMX_DMA_ERR_BURST;
345 }
346 if (imx_dmav1_readl(imxdma, DMA_DRTOSR) & (1 << i)) {
347 imx_dmav1_writel(imxdma, 1 << i, DMA_DRTOSR);
348 errcode |= IMX_DMA_ERR_REQUEST;
349 }
350 if (imx_dmav1_readl(imxdma, DMA_DSESR) & (1 << i)) {
351 imx_dmav1_writel(imxdma, 1 << i, DMA_DSESR);
352 errcode |= IMX_DMA_ERR_TRANSFER;
353 }
354 if (imx_dmav1_readl(imxdma, DMA_DBOSR) & (1 << i)) {
355 imx_dmav1_writel(imxdma, 1 << i, DMA_DBOSR);
356 errcode |= IMX_DMA_ERR_BUFFER;
357 }
358 /* Tasklet error handler */
359 tasklet_schedule(&imxdma->channel[i].dma_tasklet);
360
361 printk(KERN_WARNING
362 "DMA timeout on channel %d -%s%s%s%s\n", i,
363 errcode & IMX_DMA_ERR_BURST ? " burst" : "",
364 errcode & IMX_DMA_ERR_REQUEST ? " request" : "",
365 errcode & IMX_DMA_ERR_TRANSFER ? " transfer" : "",
366 errcode & IMX_DMA_ERR_BUFFER ? " buffer" : "");
367 }
368 return IRQ_HANDLED;
369 }
370
dma_irq_handle_channel(struct imxdma_channel * imxdmac)371 static void dma_irq_handle_channel(struct imxdma_channel *imxdmac)
372 {
373 struct imxdma_engine *imxdma = imxdmac->imxdma;
374 int chno = imxdmac->channel;
375 struct imxdma_desc *desc;
376 unsigned long flags;
377
378 spin_lock_irqsave(&imxdma->lock, flags);
379 if (list_empty(&imxdmac->ld_active)) {
380 spin_unlock_irqrestore(&imxdma->lock, flags);
381 goto out;
382 }
383
384 desc = list_first_entry(&imxdmac->ld_active,
385 struct imxdma_desc,
386 node);
387 spin_unlock_irqrestore(&imxdma->lock, flags);
388
389 if (desc->sg) {
390 u32 tmp;
391 desc->sg = sg_next(desc->sg);
392
393 if (desc->sg) {
394 imxdma_sg_next(desc);
395
396 tmp = imx_dmav1_readl(imxdma, DMA_CCR(chno));
397
398 if (imxdma_hw_chain(imxdmac)) {
399 /* FIXME: The timeout should probably be
400 * configurable
401 */
402 mod_timer(&imxdmac->watchdog,
403 jiffies + msecs_to_jiffies(500));
404
405 tmp |= CCR_CEN | CCR_RPT | CCR_ACRPT;
406 imx_dmav1_writel(imxdma, tmp, DMA_CCR(chno));
407 } else {
408 imx_dmav1_writel(imxdma, tmp & ~CCR_CEN,
409 DMA_CCR(chno));
410 tmp |= CCR_CEN;
411 }
412
413 imx_dmav1_writel(imxdma, tmp, DMA_CCR(chno));
414
415 if (imxdma_chan_is_doing_cyclic(imxdmac))
416 /* Tasklet progression */
417 tasklet_schedule(&imxdmac->dma_tasklet);
418
419 return;
420 }
421
422 if (imxdma_hw_chain(imxdmac)) {
423 del_timer(&imxdmac->watchdog);
424 return;
425 }
426 }
427
428 out:
429 imx_dmav1_writel(imxdma, 0, DMA_CCR(chno));
430 /* Tasklet irq */
431 tasklet_schedule(&imxdmac->dma_tasklet);
432 }
433
dma_irq_handler(int irq,void * dev_id)434 static irqreturn_t dma_irq_handler(int irq, void *dev_id)
435 {
436 struct imxdma_engine *imxdma = dev_id;
437 int i, disr;
438
439 if (cpu_is_mx21() || cpu_is_mx27())
440 imxdma_err_handler(irq, dev_id);
441
442 disr = imx_dmav1_readl(imxdma, DMA_DISR);
443
444 dev_dbg(imxdma->dev, "%s called, disr=0x%08x\n", __func__, disr);
445
446 imx_dmav1_writel(imxdma, disr, DMA_DISR);
447 for (i = 0; i < IMX_DMA_CHANNELS; i++) {
448 if (disr & (1 << i))
449 dma_irq_handle_channel(&imxdma->channel[i]);
450 }
451
452 return IRQ_HANDLED;
453 }
454
imxdma_xfer_desc(struct imxdma_desc * d)455 static int imxdma_xfer_desc(struct imxdma_desc *d)
456 {
457 struct imxdma_channel *imxdmac = to_imxdma_chan(d->desc.chan);
458 struct imxdma_engine *imxdma = imxdmac->imxdma;
459 int slot = -1;
460 int i;
461
462 /* Configure and enable */
463 switch (d->type) {
464 case IMXDMA_DESC_INTERLEAVED:
465 /* Try to get a free 2D slot */
466 for (i = 0; i < IMX_DMA_2D_SLOTS; i++) {
467 if ((imxdma->slots_2d[i].count > 0) &&
468 ((imxdma->slots_2d[i].xsr != d->x) ||
469 (imxdma->slots_2d[i].ysr != d->y) ||
470 (imxdma->slots_2d[i].wsr != d->w)))
471 continue;
472 slot = i;
473 break;
474 }
475 if (slot < 0)
476 return -EBUSY;
477
478 imxdma->slots_2d[slot].xsr = d->x;
479 imxdma->slots_2d[slot].ysr = d->y;
480 imxdma->slots_2d[slot].wsr = d->w;
481 imxdma->slots_2d[slot].count++;
482
483 imxdmac->slot_2d = slot;
484 imxdmac->enabled_2d = true;
485
486 if (slot == IMX_DMA_2D_SLOT_A) {
487 d->config_mem &= ~CCR_MSEL_B;
488 d->config_port &= ~CCR_MSEL_B;
489 imx_dmav1_writel(imxdma, d->x, DMA_XSRA);
490 imx_dmav1_writel(imxdma, d->y, DMA_YSRA);
491 imx_dmav1_writel(imxdma, d->w, DMA_WSRA);
492 } else {
493 d->config_mem |= CCR_MSEL_B;
494 d->config_port |= CCR_MSEL_B;
495 imx_dmav1_writel(imxdma, d->x, DMA_XSRB);
496 imx_dmav1_writel(imxdma, d->y, DMA_YSRB);
497 imx_dmav1_writel(imxdma, d->w, DMA_WSRB);
498 }
499 /*
500 * We fall-through here intentionally, since a 2D transfer is
501 * similar to MEMCPY just adding the 2D slot configuration.
502 */
503 case IMXDMA_DESC_MEMCPY:
504 imx_dmav1_writel(imxdma, d->src, DMA_SAR(imxdmac->channel));
505 imx_dmav1_writel(imxdma, d->dest, DMA_DAR(imxdmac->channel));
506 imx_dmav1_writel(imxdma, d->config_mem | (d->config_port << 2),
507 DMA_CCR(imxdmac->channel));
508
509 imx_dmav1_writel(imxdma, d->len, DMA_CNTR(imxdmac->channel));
510
511 dev_dbg(imxdma->dev, "%s channel: %d dest=0x%08x src=0x%08x "
512 "dma_length=%d\n", __func__, imxdmac->channel,
513 d->dest, d->src, d->len);
514
515 break;
516 /* Cyclic transfer is the same as slave_sg with special sg configuration. */
517 case IMXDMA_DESC_CYCLIC:
518 case IMXDMA_DESC_SLAVE_SG:
519 if (d->direction == DMA_DEV_TO_MEM) {
520 imx_dmav1_writel(imxdma, imxdmac->per_address,
521 DMA_SAR(imxdmac->channel));
522 imx_dmav1_writel(imxdma, imxdmac->ccr_from_device,
523 DMA_CCR(imxdmac->channel));
524
525 dev_dbg(imxdma->dev, "%s channel: %d sg=%p sgcount=%d "
526 "total length=%d dev_addr=0x%08x (dev2mem)\n",
527 __func__, imxdmac->channel, d->sg, d->sgcount,
528 d->len, imxdmac->per_address);
529 } else if (d->direction == DMA_MEM_TO_DEV) {
530 imx_dmav1_writel(imxdma, imxdmac->per_address,
531 DMA_DAR(imxdmac->channel));
532 imx_dmav1_writel(imxdma, imxdmac->ccr_to_device,
533 DMA_CCR(imxdmac->channel));
534
535 dev_dbg(imxdma->dev, "%s channel: %d sg=%p sgcount=%d "
536 "total length=%d dev_addr=0x%08x (mem2dev)\n",
537 __func__, imxdmac->channel, d->sg, d->sgcount,
538 d->len, imxdmac->per_address);
539 } else {
540 dev_err(imxdma->dev, "%s channel: %d bad dma mode\n",
541 __func__, imxdmac->channel);
542 return -EINVAL;
543 }
544
545 imxdma_sg_next(d);
546
547 break;
548 default:
549 return -EINVAL;
550 }
551 imxdma_enable_hw(d);
552 return 0;
553 }
554
imxdma_tasklet(unsigned long data)555 static void imxdma_tasklet(unsigned long data)
556 {
557 struct imxdma_channel *imxdmac = (void *)data;
558 struct imxdma_engine *imxdma = imxdmac->imxdma;
559 struct imxdma_desc *desc;
560 unsigned long flags;
561
562 spin_lock_irqsave(&imxdma->lock, flags);
563
564 if (list_empty(&imxdmac->ld_active)) {
565 /* Someone might have called terminate all */
566 spin_unlock_irqrestore(&imxdma->lock, flags);
567 return;
568 }
569 desc = list_first_entry(&imxdmac->ld_active, struct imxdma_desc, node);
570
571 /* If we are dealing with a cyclic descriptor keep it on ld_active
572 * and dont mark the descripor as complete.
573 * Only in non-cyclic cases it would be marked as complete
574 */
575 if (imxdma_chan_is_doing_cyclic(imxdmac))
576 goto out;
577 else
578 dma_cookie_complete(&desc->desc);
579
580 /* Free 2D slot if it was an interleaved transfer */
581 if (imxdmac->enabled_2d) {
582 imxdma->slots_2d[imxdmac->slot_2d].count--;
583 imxdmac->enabled_2d = false;
584 }
585
586 list_move_tail(imxdmac->ld_active.next, &imxdmac->ld_free);
587
588 if (!list_empty(&imxdmac->ld_queue)) {
589 desc = list_first_entry(&imxdmac->ld_queue, struct imxdma_desc,
590 node);
591 list_move_tail(imxdmac->ld_queue.next, &imxdmac->ld_active);
592 if (imxdma_xfer_desc(desc) < 0)
593 dev_warn(imxdma->dev, "%s: channel: %d couldn't xfer desc\n",
594 __func__, imxdmac->channel);
595 }
596 out:
597 spin_unlock_irqrestore(&imxdma->lock, flags);
598
599 if (desc->desc.callback)
600 desc->desc.callback(desc->desc.callback_param);
601
602 }
603
imxdma_control(struct dma_chan * chan,enum dma_ctrl_cmd cmd,unsigned long arg)604 static int imxdma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
605 unsigned long arg)
606 {
607 struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
608 struct dma_slave_config *dmaengine_cfg = (void *)arg;
609 struct imxdma_engine *imxdma = imxdmac->imxdma;
610 unsigned long flags;
611 unsigned int mode = 0;
612
613 switch (cmd) {
614 case DMA_TERMINATE_ALL:
615 imxdma_disable_hw(imxdmac);
616
617 spin_lock_irqsave(&imxdma->lock, flags);
618 list_splice_tail_init(&imxdmac->ld_active, &imxdmac->ld_free);
619 list_splice_tail_init(&imxdmac->ld_queue, &imxdmac->ld_free);
620 spin_unlock_irqrestore(&imxdma->lock, flags);
621 return 0;
622 case DMA_SLAVE_CONFIG:
623 if (dmaengine_cfg->direction == DMA_DEV_TO_MEM) {
624 imxdmac->per_address = dmaengine_cfg->src_addr;
625 imxdmac->watermark_level = dmaengine_cfg->src_maxburst;
626 imxdmac->word_size = dmaengine_cfg->src_addr_width;
627 } else {
628 imxdmac->per_address = dmaengine_cfg->dst_addr;
629 imxdmac->watermark_level = dmaengine_cfg->dst_maxburst;
630 imxdmac->word_size = dmaengine_cfg->dst_addr_width;
631 }
632
633 switch (imxdmac->word_size) {
634 case DMA_SLAVE_BUSWIDTH_1_BYTE:
635 mode = IMX_DMA_MEMSIZE_8;
636 break;
637 case DMA_SLAVE_BUSWIDTH_2_BYTES:
638 mode = IMX_DMA_MEMSIZE_16;
639 break;
640 default:
641 case DMA_SLAVE_BUSWIDTH_4_BYTES:
642 mode = IMX_DMA_MEMSIZE_32;
643 break;
644 }
645
646 imxdmac->hw_chaining = 1;
647 if (!imxdma_hw_chain(imxdmac))
648 return -EINVAL;
649 imxdmac->ccr_from_device = (mode | IMX_DMA_TYPE_FIFO) |
650 ((IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR) << 2) |
651 CCR_REN;
652 imxdmac->ccr_to_device =
653 (IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR) |
654 ((mode | IMX_DMA_TYPE_FIFO) << 2) | CCR_REN;
655 imx_dmav1_writel(imxdma, imxdmac->dma_request,
656 DMA_RSSR(imxdmac->channel));
657
658 /* Set burst length */
659 imx_dmav1_writel(imxdma, imxdmac->watermark_level *
660 imxdmac->word_size, DMA_BLR(imxdmac->channel));
661
662 return 0;
663 default:
664 return -ENOSYS;
665 }
666
667 return -EINVAL;
668 }
669
imxdma_tx_status(struct dma_chan * chan,dma_cookie_t cookie,struct dma_tx_state * txstate)670 static enum dma_status imxdma_tx_status(struct dma_chan *chan,
671 dma_cookie_t cookie,
672 struct dma_tx_state *txstate)
673 {
674 return dma_cookie_status(chan, cookie, txstate);
675 }
676
imxdma_tx_submit(struct dma_async_tx_descriptor * tx)677 static dma_cookie_t imxdma_tx_submit(struct dma_async_tx_descriptor *tx)
678 {
679 struct imxdma_channel *imxdmac = to_imxdma_chan(tx->chan);
680 struct imxdma_engine *imxdma = imxdmac->imxdma;
681 dma_cookie_t cookie;
682 unsigned long flags;
683
684 spin_lock_irqsave(&imxdma->lock, flags);
685 list_move_tail(imxdmac->ld_free.next, &imxdmac->ld_queue);
686 cookie = dma_cookie_assign(tx);
687 spin_unlock_irqrestore(&imxdma->lock, flags);
688
689 return cookie;
690 }
691
imxdma_alloc_chan_resources(struct dma_chan * chan)692 static int imxdma_alloc_chan_resources(struct dma_chan *chan)
693 {
694 struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
695 struct imx_dma_data *data = chan->private;
696
697 if (data != NULL)
698 imxdmac->dma_request = data->dma_request;
699
700 while (imxdmac->descs_allocated < IMXDMA_MAX_CHAN_DESCRIPTORS) {
701 struct imxdma_desc *desc;
702
703 desc = kzalloc(sizeof(*desc), GFP_KERNEL);
704 if (!desc)
705 break;
706 __memzero(&desc->desc, sizeof(struct dma_async_tx_descriptor));
707 dma_async_tx_descriptor_init(&desc->desc, chan);
708 desc->desc.tx_submit = imxdma_tx_submit;
709 /* txd.flags will be overwritten in prep funcs */
710 desc->desc.flags = DMA_CTRL_ACK;
711 desc->status = DMA_SUCCESS;
712
713 list_add_tail(&desc->node, &imxdmac->ld_free);
714 imxdmac->descs_allocated++;
715 }
716
717 if (!imxdmac->descs_allocated)
718 return -ENOMEM;
719
720 return imxdmac->descs_allocated;
721 }
722
imxdma_free_chan_resources(struct dma_chan * chan)723 static void imxdma_free_chan_resources(struct dma_chan *chan)
724 {
725 struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
726 struct imxdma_engine *imxdma = imxdmac->imxdma;
727 struct imxdma_desc *desc, *_desc;
728 unsigned long flags;
729
730 spin_lock_irqsave(&imxdma->lock, flags);
731
732 imxdma_disable_hw(imxdmac);
733 list_splice_tail_init(&imxdmac->ld_active, &imxdmac->ld_free);
734 list_splice_tail_init(&imxdmac->ld_queue, &imxdmac->ld_free);
735
736 spin_unlock_irqrestore(&imxdma->lock, flags);
737
738 list_for_each_entry_safe(desc, _desc, &imxdmac->ld_free, node) {
739 kfree(desc);
740 imxdmac->descs_allocated--;
741 }
742 INIT_LIST_HEAD(&imxdmac->ld_free);
743
744 if (imxdmac->sg_list) {
745 kfree(imxdmac->sg_list);
746 imxdmac->sg_list = NULL;
747 }
748 }
749
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)750 static struct dma_async_tx_descriptor *imxdma_prep_slave_sg(
751 struct dma_chan *chan, struct scatterlist *sgl,
752 unsigned int sg_len, enum dma_transfer_direction direction,
753 unsigned long flags, void *context)
754 {
755 struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
756 struct scatterlist *sg;
757 int i, dma_length = 0;
758 struct imxdma_desc *desc;
759
760 if (list_empty(&imxdmac->ld_free) ||
761 imxdma_chan_is_doing_cyclic(imxdmac))
762 return NULL;
763
764 desc = list_first_entry(&imxdmac->ld_free, struct imxdma_desc, node);
765
766 for_each_sg(sgl, sg, sg_len, i) {
767 dma_length += sg->length;
768 }
769
770 switch (imxdmac->word_size) {
771 case DMA_SLAVE_BUSWIDTH_4_BYTES:
772 if (sgl->length & 3 || sgl->dma_address & 3)
773 return NULL;
774 break;
775 case DMA_SLAVE_BUSWIDTH_2_BYTES:
776 if (sgl->length & 1 || sgl->dma_address & 1)
777 return NULL;
778 break;
779 case DMA_SLAVE_BUSWIDTH_1_BYTE:
780 break;
781 default:
782 return NULL;
783 }
784
785 desc->type = IMXDMA_DESC_SLAVE_SG;
786 desc->sg = sgl;
787 desc->sgcount = sg_len;
788 desc->len = dma_length;
789 desc->direction = direction;
790 if (direction == DMA_DEV_TO_MEM) {
791 desc->src = imxdmac->per_address;
792 } else {
793 desc->dest = imxdmac->per_address;
794 }
795 desc->desc.callback = NULL;
796 desc->desc.callback_param = NULL;
797
798 return &desc->desc;
799 }
800
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,void * context)801 static struct dma_async_tx_descriptor *imxdma_prep_dma_cyclic(
802 struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len,
803 size_t period_len, enum dma_transfer_direction direction,
804 void *context)
805 {
806 struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
807 struct imxdma_engine *imxdma = imxdmac->imxdma;
808 struct imxdma_desc *desc;
809 int i;
810 unsigned int periods = buf_len / period_len;
811
812 dev_dbg(imxdma->dev, "%s channel: %d buf_len=%d period_len=%d\n",
813 __func__, imxdmac->channel, buf_len, period_len);
814
815 if (list_empty(&imxdmac->ld_free) ||
816 imxdma_chan_is_doing_cyclic(imxdmac))
817 return NULL;
818
819 desc = list_first_entry(&imxdmac->ld_free, struct imxdma_desc, node);
820
821 if (imxdmac->sg_list)
822 kfree(imxdmac->sg_list);
823
824 imxdmac->sg_list = kcalloc(periods + 1,
825 sizeof(struct scatterlist), GFP_ATOMIC);
826 if (!imxdmac->sg_list)
827 return NULL;
828
829 sg_init_table(imxdmac->sg_list, periods);
830
831 for (i = 0; i < periods; i++) {
832 imxdmac->sg_list[i].page_link = 0;
833 imxdmac->sg_list[i].offset = 0;
834 imxdmac->sg_list[i].dma_address = dma_addr;
835 imxdmac->sg_list[i].length = period_len;
836 dma_addr += period_len;
837 }
838
839 /* close the loop */
840 imxdmac->sg_list[periods].offset = 0;
841 imxdmac->sg_list[periods].length = 0;
842 imxdmac->sg_list[periods].page_link =
843 ((unsigned long)imxdmac->sg_list | 0x01) & ~0x02;
844
845 desc->type = IMXDMA_DESC_CYCLIC;
846 desc->sg = imxdmac->sg_list;
847 desc->sgcount = periods;
848 desc->len = IMX_DMA_LENGTH_LOOP;
849 desc->direction = direction;
850 if (direction == DMA_DEV_TO_MEM) {
851 desc->src = imxdmac->per_address;
852 } else {
853 desc->dest = imxdmac->per_address;
854 }
855 desc->desc.callback = NULL;
856 desc->desc.callback_param = NULL;
857
858 return &desc->desc;
859 }
860
imxdma_prep_dma_memcpy(struct dma_chan * chan,dma_addr_t dest,dma_addr_t src,size_t len,unsigned long flags)861 static struct dma_async_tx_descriptor *imxdma_prep_dma_memcpy(
862 struct dma_chan *chan, dma_addr_t dest,
863 dma_addr_t src, size_t len, unsigned long flags)
864 {
865 struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
866 struct imxdma_engine *imxdma = imxdmac->imxdma;
867 struct imxdma_desc *desc;
868
869 dev_dbg(imxdma->dev, "%s channel: %d src=0x%x dst=0x%x len=%d\n",
870 __func__, imxdmac->channel, src, dest, len);
871
872 if (list_empty(&imxdmac->ld_free) ||
873 imxdma_chan_is_doing_cyclic(imxdmac))
874 return NULL;
875
876 desc = list_first_entry(&imxdmac->ld_free, struct imxdma_desc, node);
877
878 desc->type = IMXDMA_DESC_MEMCPY;
879 desc->src = src;
880 desc->dest = dest;
881 desc->len = len;
882 desc->direction = DMA_MEM_TO_MEM;
883 desc->config_port = IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR;
884 desc->config_mem = IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR;
885 desc->desc.callback = NULL;
886 desc->desc.callback_param = NULL;
887
888 return &desc->desc;
889 }
890
imxdma_prep_dma_interleaved(struct dma_chan * chan,struct dma_interleaved_template * xt,unsigned long flags)891 static struct dma_async_tx_descriptor *imxdma_prep_dma_interleaved(
892 struct dma_chan *chan, struct dma_interleaved_template *xt,
893 unsigned long flags)
894 {
895 struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
896 struct imxdma_engine *imxdma = imxdmac->imxdma;
897 struct imxdma_desc *desc;
898
899 dev_dbg(imxdma->dev, "%s channel: %d src_start=0x%x dst_start=0x%x\n"
900 " src_sgl=%s dst_sgl=%s numf=%d frame_size=%d\n", __func__,
901 imxdmac->channel, xt->src_start, xt->dst_start,
902 xt->src_sgl ? "true" : "false", xt->dst_sgl ? "true" : "false",
903 xt->numf, xt->frame_size);
904
905 if (list_empty(&imxdmac->ld_free) ||
906 imxdma_chan_is_doing_cyclic(imxdmac))
907 return NULL;
908
909 if (xt->frame_size != 1 || xt->numf <= 0 || xt->dir != DMA_MEM_TO_MEM)
910 return NULL;
911
912 desc = list_first_entry(&imxdmac->ld_free, struct imxdma_desc, node);
913
914 desc->type = IMXDMA_DESC_INTERLEAVED;
915 desc->src = xt->src_start;
916 desc->dest = xt->dst_start;
917 desc->x = xt->sgl[0].size;
918 desc->y = xt->numf;
919 desc->w = xt->sgl[0].icg + desc->x;
920 desc->len = desc->x * desc->y;
921 desc->direction = DMA_MEM_TO_MEM;
922 desc->config_port = IMX_DMA_MEMSIZE_32;
923 desc->config_mem = IMX_DMA_MEMSIZE_32;
924 if (xt->src_sgl)
925 desc->config_mem |= IMX_DMA_TYPE_2D;
926 if (xt->dst_sgl)
927 desc->config_port |= IMX_DMA_TYPE_2D;
928 desc->desc.callback = NULL;
929 desc->desc.callback_param = NULL;
930
931 return &desc->desc;
932 }
933
imxdma_issue_pending(struct dma_chan * chan)934 static void imxdma_issue_pending(struct dma_chan *chan)
935 {
936 struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
937 struct imxdma_engine *imxdma = imxdmac->imxdma;
938 struct imxdma_desc *desc;
939 unsigned long flags;
940
941 spin_lock_irqsave(&imxdma->lock, flags);
942 if (list_empty(&imxdmac->ld_active) &&
943 !list_empty(&imxdmac->ld_queue)) {
944 desc = list_first_entry(&imxdmac->ld_queue,
945 struct imxdma_desc, node);
946
947 if (imxdma_xfer_desc(desc) < 0) {
948 dev_warn(imxdma->dev,
949 "%s: channel: %d couldn't issue DMA xfer\n",
950 __func__, imxdmac->channel);
951 } else {
952 list_move_tail(imxdmac->ld_queue.next,
953 &imxdmac->ld_active);
954 }
955 }
956 spin_unlock_irqrestore(&imxdma->lock, flags);
957 }
958
imxdma_probe(struct platform_device * pdev)959 static int __init imxdma_probe(struct platform_device *pdev)
960 {
961 struct imxdma_engine *imxdma;
962 int ret, i;
963
964
965 imxdma = kzalloc(sizeof(*imxdma), GFP_KERNEL);
966 if (!imxdma)
967 return -ENOMEM;
968
969 if (cpu_is_mx1()) {
970 imxdma->base = MX1_IO_ADDRESS(MX1_DMA_BASE_ADDR);
971 } else if (cpu_is_mx21()) {
972 imxdma->base = MX21_IO_ADDRESS(MX21_DMA_BASE_ADDR);
973 } else if (cpu_is_mx27()) {
974 imxdma->base = MX27_IO_ADDRESS(MX27_DMA_BASE_ADDR);
975 } else {
976 kfree(imxdma);
977 return 0;
978 }
979
980 imxdma->dma_clk = clk_get(NULL, "dma");
981 if (IS_ERR(imxdma->dma_clk))
982 return PTR_ERR(imxdma->dma_clk);
983 clk_enable(imxdma->dma_clk);
984
985 /* reset DMA module */
986 imx_dmav1_writel(imxdma, DCR_DRST, DMA_DCR);
987
988 if (cpu_is_mx1()) {
989 ret = request_irq(MX1_DMA_INT, dma_irq_handler, 0, "DMA", imxdma);
990 if (ret) {
991 dev_warn(imxdma->dev, "Can't register IRQ for DMA\n");
992 kfree(imxdma);
993 return ret;
994 }
995
996 ret = request_irq(MX1_DMA_ERR, imxdma_err_handler, 0, "DMA", imxdma);
997 if (ret) {
998 dev_warn(imxdma->dev, "Can't register ERRIRQ for DMA\n");
999 free_irq(MX1_DMA_INT, NULL);
1000 kfree(imxdma);
1001 return ret;
1002 }
1003 }
1004
1005 /* enable DMA module */
1006 imx_dmav1_writel(imxdma, DCR_DEN, DMA_DCR);
1007
1008 /* clear all interrupts */
1009 imx_dmav1_writel(imxdma, (1 << IMX_DMA_CHANNELS) - 1, DMA_DISR);
1010
1011 /* disable interrupts */
1012 imx_dmav1_writel(imxdma, (1 << IMX_DMA_CHANNELS) - 1, DMA_DIMR);
1013
1014 INIT_LIST_HEAD(&imxdma->dma_device.channels);
1015
1016 dma_cap_set(DMA_SLAVE, imxdma->dma_device.cap_mask);
1017 dma_cap_set(DMA_CYCLIC, imxdma->dma_device.cap_mask);
1018 dma_cap_set(DMA_MEMCPY, imxdma->dma_device.cap_mask);
1019 dma_cap_set(DMA_INTERLEAVE, imxdma->dma_device.cap_mask);
1020
1021 /* Initialize 2D global parameters */
1022 for (i = 0; i < IMX_DMA_2D_SLOTS; i++)
1023 imxdma->slots_2d[i].count = 0;
1024
1025 spin_lock_init(&imxdma->lock);
1026
1027 /* Initialize channel parameters */
1028 for (i = 0; i < IMX_DMA_CHANNELS; i++) {
1029 struct imxdma_channel *imxdmac = &imxdma->channel[i];
1030
1031 if (cpu_is_mx21() || cpu_is_mx27()) {
1032 ret = request_irq(MX2x_INT_DMACH0 + i,
1033 dma_irq_handler, 0, "DMA", imxdma);
1034 if (ret) {
1035 dev_warn(imxdma->dev, "Can't register IRQ %d "
1036 "for DMA channel %d\n",
1037 MX2x_INT_DMACH0 + i, i);
1038 goto err_init;
1039 }
1040 init_timer(&imxdmac->watchdog);
1041 imxdmac->watchdog.function = &imxdma_watchdog;
1042 imxdmac->watchdog.data = (unsigned long)imxdmac;
1043 }
1044
1045 imxdmac->imxdma = imxdma;
1046
1047 INIT_LIST_HEAD(&imxdmac->ld_queue);
1048 INIT_LIST_HEAD(&imxdmac->ld_free);
1049 INIT_LIST_HEAD(&imxdmac->ld_active);
1050
1051 tasklet_init(&imxdmac->dma_tasklet, imxdma_tasklet,
1052 (unsigned long)imxdmac);
1053 imxdmac->chan.device = &imxdma->dma_device;
1054 dma_cookie_init(&imxdmac->chan);
1055 imxdmac->channel = i;
1056
1057 /* Add the channel to the DMAC list */
1058 list_add_tail(&imxdmac->chan.device_node,
1059 &imxdma->dma_device.channels);
1060 }
1061
1062 imxdma->dev = &pdev->dev;
1063 imxdma->dma_device.dev = &pdev->dev;
1064
1065 imxdma->dma_device.device_alloc_chan_resources = imxdma_alloc_chan_resources;
1066 imxdma->dma_device.device_free_chan_resources = imxdma_free_chan_resources;
1067 imxdma->dma_device.device_tx_status = imxdma_tx_status;
1068 imxdma->dma_device.device_prep_slave_sg = imxdma_prep_slave_sg;
1069 imxdma->dma_device.device_prep_dma_cyclic = imxdma_prep_dma_cyclic;
1070 imxdma->dma_device.device_prep_dma_memcpy = imxdma_prep_dma_memcpy;
1071 imxdma->dma_device.device_prep_interleaved_dma = imxdma_prep_dma_interleaved;
1072 imxdma->dma_device.device_control = imxdma_control;
1073 imxdma->dma_device.device_issue_pending = imxdma_issue_pending;
1074
1075 platform_set_drvdata(pdev, imxdma);
1076
1077 imxdma->dma_device.copy_align = 2; /* 2^2 = 4 bytes alignment */
1078 imxdma->dma_device.dev->dma_parms = &imxdma->dma_parms;
1079 dma_set_max_seg_size(imxdma->dma_device.dev, 0xffffff);
1080
1081 ret = dma_async_device_register(&imxdma->dma_device);
1082 if (ret) {
1083 dev_err(&pdev->dev, "unable to register\n");
1084 goto err_init;
1085 }
1086
1087 return 0;
1088
1089 err_init:
1090
1091 if (cpu_is_mx21() || cpu_is_mx27()) {
1092 while (--i >= 0)
1093 free_irq(MX2x_INT_DMACH0 + i, NULL);
1094 } else if cpu_is_mx1() {
1095 free_irq(MX1_DMA_INT, NULL);
1096 free_irq(MX1_DMA_ERR, NULL);
1097 }
1098
1099 kfree(imxdma);
1100 return ret;
1101 }
1102
imxdma_remove(struct platform_device * pdev)1103 static int __exit imxdma_remove(struct platform_device *pdev)
1104 {
1105 struct imxdma_engine *imxdma = platform_get_drvdata(pdev);
1106 int i;
1107
1108 dma_async_device_unregister(&imxdma->dma_device);
1109
1110 if (cpu_is_mx21() || cpu_is_mx27()) {
1111 for (i = 0; i < IMX_DMA_CHANNELS; i++)
1112 free_irq(MX2x_INT_DMACH0 + i, NULL);
1113 } else if cpu_is_mx1() {
1114 free_irq(MX1_DMA_INT, NULL);
1115 free_irq(MX1_DMA_ERR, NULL);
1116 }
1117
1118 kfree(imxdma);
1119
1120 return 0;
1121 }
1122
1123 static struct platform_driver imxdma_driver = {
1124 .driver = {
1125 .name = "imx-dma",
1126 },
1127 .remove = __exit_p(imxdma_remove),
1128 };
1129
imxdma_module_init(void)1130 static int __init imxdma_module_init(void)
1131 {
1132 return platform_driver_probe(&imxdma_driver, imxdma_probe);
1133 }
1134 subsys_initcall(imxdma_module_init);
1135
1136 MODULE_AUTHOR("Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>");
1137 MODULE_DESCRIPTION("i.MX dma driver");
1138 MODULE_LICENSE("GPL");
1139