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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/err.h>
18#include <linux/init.h>
19#include <linux/types.h>
20#include <linux/mm.h>
21#include <linux/interrupt.h>
22#include <linux/spinlock.h>
23#include <linux/device.h>
24#include <linux/dma-mapping.h>
25#include <linux/slab.h>
26#include <linux/platform_device.h>
27#include <linux/clk.h>
28#include <linux/dmaengine.h>
29#include <linux/module.h>
30#include <linux/of_device.h>
31#include <linux/of_dma.h>
32
33#include <asm/irq.h>
34#include <linux/platform_data/dma-imx.h>
35
36#include "dmaengine.h"
37#define IMXDMA_MAX_CHAN_DESCRIPTORS 16
38#define IMX_DMA_CHANNELS 16
39
40#define IMX_DMA_2D_SLOTS 2
41#define IMX_DMA_2D_SLOT_A 0
42#define IMX_DMA_2D_SLOT_B 1
43
44#define IMX_DMA_LENGTH_LOOP ((unsigned int)-1)
45#define IMX_DMA_MEMSIZE_32 (0 << 4)
46#define IMX_DMA_MEMSIZE_8 (1 << 4)
47#define IMX_DMA_MEMSIZE_16 (2 << 4)
48#define IMX_DMA_TYPE_LINEAR (0 << 10)
49#define IMX_DMA_TYPE_2D (1 << 10)
50#define IMX_DMA_TYPE_FIFO (2 << 10)
51
52#define IMX_DMA_ERR_BURST (1 << 0)
53#define IMX_DMA_ERR_REQUEST (1 << 1)
54#define IMX_DMA_ERR_TRANSFER (1 << 2)
55#define IMX_DMA_ERR_BUFFER (1 << 3)
56#define IMX_DMA_ERR_TIMEOUT (1 << 4)
57
58#define DMA_DCR 0x00 /* Control Register */
59#define DMA_DISR 0x04 /* Interrupt status Register */
60#define DMA_DIMR 0x08 /* Interrupt mask Register */
61#define DMA_DBTOSR 0x0c /* Burst timeout status Register */
62#define DMA_DRTOSR 0x10 /* Request timeout Register */
63#define DMA_DSESR 0x14 /* Transfer Error Status Register */
64#define DMA_DBOSR 0x18 /* Buffer overflow status Register */
65#define DMA_DBTOCR 0x1c /* Burst timeout control Register */
66#define DMA_WSRA 0x40 /* W-Size Register A */
67#define DMA_XSRA 0x44 /* X-Size Register A */
68#define DMA_YSRA 0x48 /* Y-Size Register A */
69#define DMA_WSRB 0x4c /* W-Size Register B */
70#define DMA_XSRB 0x50 /* X-Size Register B */
71#define DMA_YSRB 0x54 /* Y-Size Register B */
72#define DMA_SAR(x) (0x80 + ((x) << 6)) /* Source Address Registers */
73#define DMA_DAR(x) (0x84 + ((x) << 6)) /* Destination Address Registers */
74#define DMA_CNTR(x) (0x88 + ((x) << 6)) /* Count Registers */
75#define DMA_CCR(x) (0x8c + ((x) << 6)) /* Control Registers */
76#define DMA_RSSR(x) (0x90 + ((x) << 6)) /* Request source select Registers */
77#define DMA_BLR(x) (0x94 + ((x) << 6)) /* Burst length Registers */
78#define DMA_RTOR(x) (0x98 + ((x) << 6)) /* Request timeout Registers */
79#define DMA_BUCR(x) (0x98 + ((x) << 6)) /* Bus Utilization Registers */
80#define DMA_CCNR(x) (0x9C + ((x) << 6)) /* Channel counter Registers */
81
82#define DCR_DRST (1<<1)
83#define DCR_DEN (1<<0)
84#define DBTOCR_EN (1<<15)
85#define DBTOCR_CNT(x) ((x) & 0x7fff)
86#define CNTR_CNT(x) ((x) & 0xffffff)
87#define CCR_ACRPT (1<<14)
88#define CCR_DMOD_LINEAR (0x0 << 12)
89#define CCR_DMOD_2D (0x1 << 12)
90#define CCR_DMOD_FIFO (0x2 << 12)
91#define CCR_DMOD_EOBFIFO (0x3 << 12)
92#define CCR_SMOD_LINEAR (0x0 << 10)
93#define CCR_SMOD_2D (0x1 << 10)
94#define CCR_SMOD_FIFO (0x2 << 10)
95#define CCR_SMOD_EOBFIFO (0x3 << 10)
96#define CCR_MDIR_DEC (1<<9)
97#define CCR_MSEL_B (1<<8)
98#define CCR_DSIZ_32 (0x0 << 6)
99#define CCR_DSIZ_8 (0x1 << 6)
100#define CCR_DSIZ_16 (0x2 << 6)
101#define CCR_SSIZ_32 (0x0 << 4)
102#define CCR_SSIZ_8 (0x1 << 4)
103#define CCR_SSIZ_16 (0x2 << 4)
104#define CCR_REN (1<<3)
105#define CCR_RPT (1<<2)
106#define CCR_FRC (1<<1)
107#define CCR_CEN (1<<0)
108#define RTOR_EN (1<<15)
109#define RTOR_CLK (1<<14)
110#define RTOR_PSC (1<<13)
111
112enum imxdma_prep_type {
113 IMXDMA_DESC_MEMCPY,
114 IMXDMA_DESC_INTERLEAVED,
115 IMXDMA_DESC_SLAVE_SG,
116 IMXDMA_DESC_CYCLIC,
117};
118
119struct imx_dma_2d_config {
120 u16 xsr;
121 u16 ysr;
122 u16 wsr;
123 int count;
124};
125
126struct imxdma_desc {
127 struct list_head node;
128 struct dma_async_tx_descriptor desc;
129 enum dma_status status;
130 dma_addr_t src;
131 dma_addr_t dest;
132 size_t len;
133 enum dma_transfer_direction direction;
134 enum imxdma_prep_type type;
135 /* For memcpy and interleaved */
136 unsigned int config_port;
137 unsigned int config_mem;
138 /* For interleaved transfers */
139 unsigned int x;
140 unsigned int y;
141 unsigned int w;
142 /* For slave sg and cyclic */
143 struct scatterlist *sg;
144 unsigned int sgcount;
145};
146
147struct imxdma_channel {
148 int hw_chaining;
149 struct timer_list watchdog;
150 struct imxdma_engine *imxdma;
151 unsigned int channel;
152
153 struct tasklet_struct dma_tasklet;
154 struct list_head ld_free;
155 struct list_head ld_queue;
156 struct list_head ld_active;
157 int descs_allocated;
158 enum dma_slave_buswidth word_size;
159 dma_addr_t per_address;
160 u32 watermark_level;
161 struct dma_chan chan;
162 struct dma_async_tx_descriptor desc;
163 enum dma_status status;
164 int dma_request;
165 struct scatterlist *sg_list;
166 u32 ccr_from_device;
167 u32 ccr_to_device;
168 bool enabled_2d;
169 int slot_2d;
170};
171
172enum imx_dma_type {
173 IMX1_DMA,
174 IMX21_DMA,
175 IMX27_DMA,
176};
177
178struct imxdma_engine {
179 struct device *dev;
180 struct device_dma_parameters dma_parms;
181 struct dma_device dma_device;
182 void __iomem *base;
183 struct clk *dma_ahb;
184 struct clk *dma_ipg;
185 spinlock_t lock;
186 struct imx_dma_2d_config slots_2d[IMX_DMA_2D_SLOTS];
187 struct imxdma_channel channel[IMX_DMA_CHANNELS];
188 enum imx_dma_type devtype;
189};
190
191struct imxdma_filter_data {
192 struct imxdma_engine *imxdma;
193 int request;
194};
195
196static const struct platform_device_id imx_dma_devtype[] = {
197 {
198 .name = "imx1-dma",
199 .driver_data = IMX1_DMA,
200 }, {
201 .name = "imx21-dma",
202 .driver_data = IMX21_DMA,
203 }, {
204 .name = "imx27-dma",
205 .driver_data = IMX27_DMA,
206 }, {
207 /* sentinel */
208 }
209};
210MODULE_DEVICE_TABLE(platform, imx_dma_devtype);
211
212static const struct of_device_id imx_dma_of_dev_id[] = {
213 {
214 .compatible = "fsl,imx1-dma",
215 .data = &imx_dma_devtype[IMX1_DMA],
216 }, {
217 .compatible = "fsl,imx21-dma",
218 .data = &imx_dma_devtype[IMX21_DMA],
219 }, {
220 .compatible = "fsl,imx27-dma",
221 .data = &imx_dma_devtype[IMX27_DMA],
222 }, {
223 /* sentinel */
224 }
225};
226MODULE_DEVICE_TABLE(of, imx_dma_of_dev_id);
227
228static inline int is_imx1_dma(struct imxdma_engine *imxdma)
229{
230 return imxdma->devtype == IMX1_DMA;
231}
232
233static inline int is_imx27_dma(struct imxdma_engine *imxdma)
234{
235 return imxdma->devtype == IMX27_DMA;
236}
237
238static struct imxdma_channel *to_imxdma_chan(struct dma_chan *chan)
239{
240 return container_of(chan, struct imxdma_channel, chan);
241}
242
243static inline bool imxdma_chan_is_doing_cyclic(struct imxdma_channel *imxdmac)
244{
245 struct imxdma_desc *desc;
246
247 if (!list_empty(&imxdmac->ld_active)) {
248 desc = list_first_entry(&imxdmac->ld_active, struct imxdma_desc,
249 node);
250 if (desc->type == IMXDMA_DESC_CYCLIC)
251 return true;
252 }
253 return false;
254}
255
256
257
258static void imx_dmav1_writel(struct imxdma_engine *imxdma, unsigned val,
259 unsigned offset)
260{
261 __raw_writel(val, imxdma->base + offset);
262}
263
264static unsigned imx_dmav1_readl(struct imxdma_engine *imxdma, unsigned offset)
265{
266 return __raw_readl(imxdma->base + offset);
267}
268
269static int imxdma_hw_chain(struct imxdma_channel *imxdmac)
270{
271 struct imxdma_engine *imxdma = imxdmac->imxdma;
272
273 if (is_imx27_dma(imxdma))
274 return imxdmac->hw_chaining;
275 else
276 return 0;
277}
278
279/*
280 * imxdma_sg_next - prepare next chunk for scatter-gather DMA emulation
281 */
282static inline int imxdma_sg_next(struct imxdma_desc *d)
283{
284 struct imxdma_channel *imxdmac = to_imxdma_chan(d->desc.chan);
285 struct imxdma_engine *imxdma = imxdmac->imxdma;
286 struct scatterlist *sg = d->sg;
287 unsigned long now;
288
289 now = min(d->len, sg_dma_len(sg));
290 if (d->len != IMX_DMA_LENGTH_LOOP)
291 d->len -= now;
292
293 if (d->direction == DMA_DEV_TO_MEM)
294 imx_dmav1_writel(imxdma, sg->dma_address,
295 DMA_DAR(imxdmac->channel));
296 else
297 imx_dmav1_writel(imxdma, sg->dma_address,
298 DMA_SAR(imxdmac->channel));
299
300 imx_dmav1_writel(imxdma, now, DMA_CNTR(imxdmac->channel));
301
302 dev_dbg(imxdma->dev, " %s channel: %d dst 0x%08x, src 0x%08x, "
303 "size 0x%08x\n", __func__, imxdmac->channel,
304 imx_dmav1_readl(imxdma, DMA_DAR(imxdmac->channel)),
305 imx_dmav1_readl(imxdma, DMA_SAR(imxdmac->channel)),
306 imx_dmav1_readl(imxdma, DMA_CNTR(imxdmac->channel)));
307
308 return now;
309}
310
311static void imxdma_enable_hw(struct imxdma_desc *d)
312{
313 struct imxdma_channel *imxdmac = to_imxdma_chan(d->desc.chan);
314 struct imxdma_engine *imxdma = imxdmac->imxdma;
315 int channel = imxdmac->channel;
316 unsigned long flags;
317
318 dev_dbg(imxdma->dev, "%s channel %d\n", __func__, channel);
319
320 local_irq_save(flags);
321
322 imx_dmav1_writel(imxdma, 1 << channel, DMA_DISR);
323 imx_dmav1_writel(imxdma, imx_dmav1_readl(imxdma, DMA_DIMR) &
324 ~(1 << channel), DMA_DIMR);
325 imx_dmav1_writel(imxdma, imx_dmav1_readl(imxdma, DMA_CCR(channel)) |
326 CCR_CEN | CCR_ACRPT, DMA_CCR(channel));
327
328 if (!is_imx1_dma(imxdma) &&
329 d->sg && imxdma_hw_chain(imxdmac)) {
330 d->sg = sg_next(d->sg);
331 if (d->sg) {
332 u32 tmp;
333 imxdma_sg_next(d);
334 tmp = imx_dmav1_readl(imxdma, DMA_CCR(channel));
335 imx_dmav1_writel(imxdma, tmp | CCR_RPT | CCR_ACRPT,
336 DMA_CCR(channel));
337 }
338 }
339
340 local_irq_restore(flags);
341}
342
343static void imxdma_disable_hw(struct imxdma_channel *imxdmac)
344{
345 struct imxdma_engine *imxdma = imxdmac->imxdma;
346 int channel = imxdmac->channel;
347 unsigned long flags;
348
349 dev_dbg(imxdma->dev, "%s channel %d\n", __func__, channel);
350
351 if (imxdma_hw_chain(imxdmac))
352 del_timer(&imxdmac->watchdog);
353
354 local_irq_save(flags);
355 imx_dmav1_writel(imxdma, imx_dmav1_readl(imxdma, DMA_DIMR) |
356 (1 << channel), DMA_DIMR);
357 imx_dmav1_writel(imxdma, imx_dmav1_readl(imxdma, DMA_CCR(channel)) &
358 ~CCR_CEN, DMA_CCR(channel));
359 imx_dmav1_writel(imxdma, 1 << channel, DMA_DISR);
360 local_irq_restore(flags);
361}
362
363static void imxdma_watchdog(unsigned long data)
364{
365 struct imxdma_channel *imxdmac = (struct imxdma_channel *)data;
366 struct imxdma_engine *imxdma = imxdmac->imxdma;
367 int channel = imxdmac->channel;
368
369 imx_dmav1_writel(imxdma, 0, DMA_CCR(channel));
370
371 /* Tasklet watchdog error handler */
372 tasklet_schedule(&imxdmac->dma_tasklet);
373 dev_dbg(imxdma->dev, "channel %d: watchdog timeout!\n",
374 imxdmac->channel);
375}
376
377static irqreturn_t imxdma_err_handler(int irq, void *dev_id)
378{
379 struct imxdma_engine *imxdma = dev_id;
380 unsigned int err_mask;
381 int i, disr;
382 int errcode;
383
384 disr = imx_dmav1_readl(imxdma, DMA_DISR);
385
386 err_mask = imx_dmav1_readl(imxdma, DMA_DBTOSR) |
387 imx_dmav1_readl(imxdma, DMA_DRTOSR) |
388 imx_dmav1_readl(imxdma, DMA_DSESR) |
389 imx_dmav1_readl(imxdma, DMA_DBOSR);
390
391 if (!err_mask)
392 return IRQ_HANDLED;
393
394 imx_dmav1_writel(imxdma, disr & err_mask, DMA_DISR);
395
396 for (i = 0; i < IMX_DMA_CHANNELS; i++) {
397 if (!(err_mask & (1 << i)))
398 continue;
399 errcode = 0;
400
401 if (imx_dmav1_readl(imxdma, DMA_DBTOSR) & (1 << i)) {
402 imx_dmav1_writel(imxdma, 1 << i, DMA_DBTOSR);
403 errcode |= IMX_DMA_ERR_BURST;
404 }
405 if (imx_dmav1_readl(imxdma, DMA_DRTOSR) & (1 << i)) {
406 imx_dmav1_writel(imxdma, 1 << i, DMA_DRTOSR);
407 errcode |= IMX_DMA_ERR_REQUEST;
408 }
409 if (imx_dmav1_readl(imxdma, DMA_DSESR) & (1 << i)) {
410 imx_dmav1_writel(imxdma, 1 << i, DMA_DSESR);
411 errcode |= IMX_DMA_ERR_TRANSFER;
412 }
413 if (imx_dmav1_readl(imxdma, DMA_DBOSR) & (1 << i)) {
414 imx_dmav1_writel(imxdma, 1 << i, DMA_DBOSR);
415 errcode |= IMX_DMA_ERR_BUFFER;
416 }
417 /* Tasklet error handler */
418 tasklet_schedule(&imxdma->channel[i].dma_tasklet);
419
420 dev_warn(imxdma->dev,
421 "DMA timeout on channel %d -%s%s%s%s\n", i,
422 errcode & IMX_DMA_ERR_BURST ? " burst" : "",
423 errcode & IMX_DMA_ERR_REQUEST ? " request" : "",
424 errcode & IMX_DMA_ERR_TRANSFER ? " transfer" : "",
425 errcode & IMX_DMA_ERR_BUFFER ? " buffer" : "");
426 }
427 return IRQ_HANDLED;
428}
429
430static void dma_irq_handle_channel(struct imxdma_channel *imxdmac)
431{
432 struct imxdma_engine *imxdma = imxdmac->imxdma;
433 int chno = imxdmac->channel;
434 struct imxdma_desc *desc;
435 unsigned long flags;
436
437 spin_lock_irqsave(&imxdma->lock, flags);
438 if (list_empty(&imxdmac->ld_active)) {
439 spin_unlock_irqrestore(&imxdma->lock, flags);
440 goto out;
441 }
442
443 desc = list_first_entry(&imxdmac->ld_active,
444 struct imxdma_desc,
445 node);
446 spin_unlock_irqrestore(&imxdma->lock, flags);
447
448 if (desc->sg) {
449 u32 tmp;
450 desc->sg = sg_next(desc->sg);
451
452 if (desc->sg) {
453 imxdma_sg_next(desc);
454
455 tmp = imx_dmav1_readl(imxdma, DMA_CCR(chno));
456
457 if (imxdma_hw_chain(imxdmac)) {
458 /* FIXME: The timeout should probably be
459 * configurable
460 */
461 mod_timer(&imxdmac->watchdog,
462 jiffies + msecs_to_jiffies(500));
463
464 tmp |= CCR_CEN | CCR_RPT | CCR_ACRPT;
465 imx_dmav1_writel(imxdma, tmp, DMA_CCR(chno));
466 } else {
467 imx_dmav1_writel(imxdma, tmp & ~CCR_CEN,
468 DMA_CCR(chno));
469 tmp |= CCR_CEN;
470 }
471
472 imx_dmav1_writel(imxdma, tmp, DMA_CCR(chno));
473
474 if (imxdma_chan_is_doing_cyclic(imxdmac))
475 /* Tasklet progression */
476 tasklet_schedule(&imxdmac->dma_tasklet);
477
478 return;
479 }
480
481 if (imxdma_hw_chain(imxdmac)) {
482 del_timer(&imxdmac->watchdog);
483 return;
484 }
485 }
486
487out:
488 imx_dmav1_writel(imxdma, 0, DMA_CCR(chno));
489 /* Tasklet irq */
490 tasklet_schedule(&imxdmac->dma_tasklet);
491}
492
493static irqreturn_t dma_irq_handler(int irq, void *dev_id)
494{
495 struct imxdma_engine *imxdma = dev_id;
496 int i, disr;
497
498 if (!is_imx1_dma(imxdma))
499 imxdma_err_handler(irq, dev_id);
500
501 disr = imx_dmav1_readl(imxdma, DMA_DISR);
502
503 dev_dbg(imxdma->dev, "%s called, disr=0x%08x\n", __func__, disr);
504
505 imx_dmav1_writel(imxdma, disr, DMA_DISR);
506 for (i = 0; i < IMX_DMA_CHANNELS; i++) {
507 if (disr & (1 << i))
508 dma_irq_handle_channel(&imxdma->channel[i]);
509 }
510
511 return IRQ_HANDLED;
512}
513
514static int imxdma_xfer_desc(struct imxdma_desc *d)
515{
516 struct imxdma_channel *imxdmac = to_imxdma_chan(d->desc.chan);
517 struct imxdma_engine *imxdma = imxdmac->imxdma;
518 int slot = -1;
519 int i;
520
521 /* Configure and enable */
522 switch (d->type) {
523 case IMXDMA_DESC_INTERLEAVED:
524 /* Try to get a free 2D slot */
525 for (i = 0; i < IMX_DMA_2D_SLOTS; i++) {
526 if ((imxdma->slots_2d[i].count > 0) &&
527 ((imxdma->slots_2d[i].xsr != d->x) ||
528 (imxdma->slots_2d[i].ysr != d->y) ||
529 (imxdma->slots_2d[i].wsr != d->w)))
530 continue;
531 slot = i;
532 break;
533 }
534 if (slot < 0)
535 return -EBUSY;
536
537 imxdma->slots_2d[slot].xsr = d->x;
538 imxdma->slots_2d[slot].ysr = d->y;
539 imxdma->slots_2d[slot].wsr = d->w;
540 imxdma->slots_2d[slot].count++;
541
542 imxdmac->slot_2d = slot;
543 imxdmac->enabled_2d = true;
544
545 if (slot == IMX_DMA_2D_SLOT_A) {
546 d->config_mem &= ~CCR_MSEL_B;
547 d->config_port &= ~CCR_MSEL_B;
548 imx_dmav1_writel(imxdma, d->x, DMA_XSRA);
549 imx_dmav1_writel(imxdma, d->y, DMA_YSRA);
550 imx_dmav1_writel(imxdma, d->w, DMA_WSRA);
551 } else {
552 d->config_mem |= CCR_MSEL_B;
553 d->config_port |= CCR_MSEL_B;
554 imx_dmav1_writel(imxdma, d->x, DMA_XSRB);
555 imx_dmav1_writel(imxdma, d->y, DMA_YSRB);
556 imx_dmav1_writel(imxdma, d->w, DMA_WSRB);
557 }
558 /*
559 * We fall-through here intentionally, since a 2D transfer is
560 * similar to MEMCPY just adding the 2D slot configuration.
561 */
562 case IMXDMA_DESC_MEMCPY:
563 imx_dmav1_writel(imxdma, d->src, DMA_SAR(imxdmac->channel));
564 imx_dmav1_writel(imxdma, d->dest, DMA_DAR(imxdmac->channel));
565 imx_dmav1_writel(imxdma, d->config_mem | (d->config_port << 2),
566 DMA_CCR(imxdmac->channel));
567
568 imx_dmav1_writel(imxdma, d->len, DMA_CNTR(imxdmac->channel));
569
570 dev_dbg(imxdma->dev,
571 "%s channel: %d dest=0x%08llx src=0x%08llx dma_length=%zu\n",
572 __func__, imxdmac->channel,
573 (unsigned long long)d->dest,
574 (unsigned long long)d->src, d->len);
575
576 break;
577 /* Cyclic transfer is the same as slave_sg with special sg configuration. */
578 case IMXDMA_DESC_CYCLIC:
579 case IMXDMA_DESC_SLAVE_SG:
580 if (d->direction == DMA_DEV_TO_MEM) {
581 imx_dmav1_writel(imxdma, imxdmac->per_address,
582 DMA_SAR(imxdmac->channel));
583 imx_dmav1_writel(imxdma, imxdmac->ccr_from_device,
584 DMA_CCR(imxdmac->channel));
585
586 dev_dbg(imxdma->dev,
587 "%s channel: %d sg=%p sgcount=%d total length=%zu dev_addr=0x%08llx (dev2mem)\n",
588 __func__, imxdmac->channel,
589 d->sg, d->sgcount, d->len,
590 (unsigned long long)imxdmac->per_address);
591 } else if (d->direction == DMA_MEM_TO_DEV) {
592 imx_dmav1_writel(imxdma, imxdmac->per_address,
593 DMA_DAR(imxdmac->channel));
594 imx_dmav1_writel(imxdma, imxdmac->ccr_to_device,
595 DMA_CCR(imxdmac->channel));
596
597 dev_dbg(imxdma->dev,
598 "%s channel: %d sg=%p sgcount=%d total length=%zu dev_addr=0x%08llx (mem2dev)\n",
599 __func__, imxdmac->channel,
600 d->sg, d->sgcount, d->len,
601 (unsigned long long)imxdmac->per_address);
602 } else {
603 dev_err(imxdma->dev, "%s channel: %d bad dma mode\n",
604 __func__, imxdmac->channel);
605 return -EINVAL;
606 }
607
608 imxdma_sg_next(d);
609
610 break;
611 default:
612 return -EINVAL;
613 }
614 imxdma_enable_hw(d);
615 return 0;
616}
617
618static void imxdma_tasklet(unsigned long data)
619{
620 struct imxdma_channel *imxdmac = (void *)data;
621 struct imxdma_engine *imxdma = imxdmac->imxdma;
622 struct imxdma_desc *desc;
623 unsigned long flags;
624
625 spin_lock_irqsave(&imxdma->lock, flags);
626
627 if (list_empty(&imxdmac->ld_active)) {
628 /* Someone might have called terminate all */
629 spin_unlock_irqrestore(&imxdma->lock, flags);
630 return;
631 }
632 desc = list_first_entry(&imxdmac->ld_active, struct imxdma_desc, node);
633
634 /* If we are dealing with a cyclic descriptor, keep it on ld_active
635 * and dont mark the descriptor as complete.
636 * Only in non-cyclic cases it would be marked as complete
637 */
638 if (imxdma_chan_is_doing_cyclic(imxdmac))
639 goto out;
640 else
641 dma_cookie_complete(&desc->desc);
642
643 /* Free 2D slot if it was an interleaved transfer */
644 if (imxdmac->enabled_2d) {
645 imxdma->slots_2d[imxdmac->slot_2d].count--;
646 imxdmac->enabled_2d = false;
647 }
648
649 list_move_tail(imxdmac->ld_active.next, &imxdmac->ld_free);
650
651 if (!list_empty(&imxdmac->ld_queue)) {
652 desc = list_first_entry(&imxdmac->ld_queue, struct imxdma_desc,
653 node);
654 list_move_tail(imxdmac->ld_queue.next, &imxdmac->ld_active);
655 if (imxdma_xfer_desc(desc) < 0)
656 dev_warn(imxdma->dev, "%s: channel: %d couldn't xfer desc\n",
657 __func__, imxdmac->channel);
658 }
659out:
660 spin_unlock_irqrestore(&imxdma->lock, flags);
661
662 if (desc->desc.callback)
663 desc->desc.callback(desc->desc.callback_param);
664
665}
666
667static int imxdma_terminate_all(struct dma_chan *chan)
668{
669 struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
670 struct imxdma_engine *imxdma = imxdmac->imxdma;
671 unsigned long flags;
672
673 imxdma_disable_hw(imxdmac);
674
675 spin_lock_irqsave(&imxdma->lock, flags);
676 list_splice_tail_init(&imxdmac->ld_active, &imxdmac->ld_free);
677 list_splice_tail_init(&imxdmac->ld_queue, &imxdmac->ld_free);
678 spin_unlock_irqrestore(&imxdma->lock, flags);
679 return 0;
680}
681
682static int imxdma_config(struct dma_chan *chan,
683 struct dma_slave_config *dmaengine_cfg)
684{
685 struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
686 struct imxdma_engine *imxdma = imxdmac->imxdma;
687 unsigned int mode = 0;
688
689 if (dmaengine_cfg->direction == DMA_DEV_TO_MEM) {
690 imxdmac->per_address = dmaengine_cfg->src_addr;
691 imxdmac->watermark_level = dmaengine_cfg->src_maxburst;
692 imxdmac->word_size = dmaengine_cfg->src_addr_width;
693 } else {
694 imxdmac->per_address = dmaengine_cfg->dst_addr;
695 imxdmac->watermark_level = dmaengine_cfg->dst_maxburst;
696 imxdmac->word_size = dmaengine_cfg->dst_addr_width;
697 }
698
699 switch (imxdmac->word_size) {
700 case DMA_SLAVE_BUSWIDTH_1_BYTE:
701 mode = IMX_DMA_MEMSIZE_8;
702 break;
703 case DMA_SLAVE_BUSWIDTH_2_BYTES:
704 mode = IMX_DMA_MEMSIZE_16;
705 break;
706 default:
707 case DMA_SLAVE_BUSWIDTH_4_BYTES:
708 mode = IMX_DMA_MEMSIZE_32;
709 break;
710 }
711
712 imxdmac->hw_chaining = 0;
713
714 imxdmac->ccr_from_device = (mode | IMX_DMA_TYPE_FIFO) |
715 ((IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR) << 2) |
716 CCR_REN;
717 imxdmac->ccr_to_device =
718 (IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR) |
719 ((mode | IMX_DMA_TYPE_FIFO) << 2) | CCR_REN;
720 imx_dmav1_writel(imxdma, imxdmac->dma_request,
721 DMA_RSSR(imxdmac->channel));
722
723 /* Set burst length */
724 imx_dmav1_writel(imxdma, imxdmac->watermark_level *
725 imxdmac->word_size, DMA_BLR(imxdmac->channel));
726
727 return 0;
728}
729
730static enum dma_status imxdma_tx_status(struct dma_chan *chan,
731 dma_cookie_t cookie,
732 struct dma_tx_state *txstate)
733{
734 return dma_cookie_status(chan, cookie, txstate);
735}
736
737static dma_cookie_t imxdma_tx_submit(struct dma_async_tx_descriptor *tx)
738{
739 struct imxdma_channel *imxdmac = to_imxdma_chan(tx->chan);
740 struct imxdma_engine *imxdma = imxdmac->imxdma;
741 dma_cookie_t cookie;
742 unsigned long flags;
743
744 spin_lock_irqsave(&imxdma->lock, flags);
745 list_move_tail(imxdmac->ld_free.next, &imxdmac->ld_queue);
746 cookie = dma_cookie_assign(tx);
747 spin_unlock_irqrestore(&imxdma->lock, flags);
748
749 return cookie;
750}
751
752static int imxdma_alloc_chan_resources(struct dma_chan *chan)
753{
754 struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
755 struct imx_dma_data *data = chan->private;
756
757 if (data != NULL)
758 imxdmac->dma_request = data->dma_request;
759
760 while (imxdmac->descs_allocated < IMXDMA_MAX_CHAN_DESCRIPTORS) {
761 struct imxdma_desc *desc;
762
763 desc = kzalloc(sizeof(*desc), GFP_KERNEL);
764 if (!desc)
765 break;
766 __memzero(&desc->desc, sizeof(struct dma_async_tx_descriptor));
767 dma_async_tx_descriptor_init(&desc->desc, chan);
768 desc->desc.tx_submit = imxdma_tx_submit;
769 /* txd.flags will be overwritten in prep funcs */
770 desc->desc.flags = DMA_CTRL_ACK;
771 desc->status = DMA_COMPLETE;
772
773 list_add_tail(&desc->node, &imxdmac->ld_free);
774 imxdmac->descs_allocated++;
775 }
776
777 if (!imxdmac->descs_allocated)
778 return -ENOMEM;
779
780 return imxdmac->descs_allocated;
781}
782
783static void imxdma_free_chan_resources(struct dma_chan *chan)
784{
785 struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
786 struct imxdma_engine *imxdma = imxdmac->imxdma;
787 struct imxdma_desc *desc, *_desc;
788 unsigned long flags;
789
790 spin_lock_irqsave(&imxdma->lock, flags);
791
792 imxdma_disable_hw(imxdmac);
793 list_splice_tail_init(&imxdmac->ld_active, &imxdmac->ld_free);
794 list_splice_tail_init(&imxdmac->ld_queue, &imxdmac->ld_free);
795
796 spin_unlock_irqrestore(&imxdma->lock, flags);
797
798 list_for_each_entry_safe(desc, _desc, &imxdmac->ld_free, node) {
799 kfree(desc);
800 imxdmac->descs_allocated--;
801 }
802 INIT_LIST_HEAD(&imxdmac->ld_free);
803
804 kfree(imxdmac->sg_list);
805 imxdmac->sg_list = NULL;
806}
807
808static struct dma_async_tx_descriptor *imxdma_prep_slave_sg(
809 struct dma_chan *chan, struct scatterlist *sgl,
810 unsigned int sg_len, enum dma_transfer_direction direction,
811 unsigned long flags, void *context)
812{
813 struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
814 struct scatterlist *sg;
815 int i, dma_length = 0;
816 struct imxdma_desc *desc;
817
818 if (list_empty(&imxdmac->ld_free) ||
819 imxdma_chan_is_doing_cyclic(imxdmac))
820 return NULL;
821
822 desc = list_first_entry(&imxdmac->ld_free, struct imxdma_desc, node);
823
824 for_each_sg(sgl, sg, sg_len, i) {
825 dma_length += sg_dma_len(sg);
826 }
827
828 switch (imxdmac->word_size) {
829 case DMA_SLAVE_BUSWIDTH_4_BYTES:
830 if (sg_dma_len(sgl) & 3 || sgl->dma_address & 3)
831 return NULL;
832 break;
833 case DMA_SLAVE_BUSWIDTH_2_BYTES:
834 if (sg_dma_len(sgl) & 1 || sgl->dma_address & 1)
835 return NULL;
836 break;
837 case DMA_SLAVE_BUSWIDTH_1_BYTE:
838 break;
839 default:
840 return NULL;
841 }
842
843 desc->type = IMXDMA_DESC_SLAVE_SG;
844 desc->sg = sgl;
845 desc->sgcount = sg_len;
846 desc->len = dma_length;
847 desc->direction = direction;
848 if (direction == DMA_DEV_TO_MEM) {
849 desc->src = imxdmac->per_address;
850 } else {
851 desc->dest = imxdmac->per_address;
852 }
853 desc->desc.callback = NULL;
854 desc->desc.callback_param = NULL;
855
856 return &desc->desc;
857}
858
859static struct dma_async_tx_descriptor *imxdma_prep_dma_cyclic(
860 struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len,
861 size_t period_len, enum dma_transfer_direction direction,
862 unsigned long flags)
863{
864 struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
865 struct imxdma_engine *imxdma = imxdmac->imxdma;
866 struct imxdma_desc *desc;
867 int i;
868 unsigned int periods = buf_len / period_len;
869
870 dev_dbg(imxdma->dev, "%s channel: %d buf_len=%zu period_len=%zu\n",
871 __func__, imxdmac->channel, buf_len, period_len);
872
873 if (list_empty(&imxdmac->ld_free) ||
874 imxdma_chan_is_doing_cyclic(imxdmac))
875 return NULL;
876
877 desc = list_first_entry(&imxdmac->ld_free, struct imxdma_desc, node);
878
879 kfree(imxdmac->sg_list);
880
881 imxdmac->sg_list = kcalloc(periods + 1,
882 sizeof(struct scatterlist), GFP_ATOMIC);
883 if (!imxdmac->sg_list)
884 return NULL;
885
886 sg_init_table(imxdmac->sg_list, periods);
887
888 for (i = 0; i < periods; i++) {
889 imxdmac->sg_list[i].page_link = 0;
890 imxdmac->sg_list[i].offset = 0;
891 imxdmac->sg_list[i].dma_address = dma_addr;
892 sg_dma_len(&imxdmac->sg_list[i]) = period_len;
893 dma_addr += period_len;
894 }
895
896 /* close the loop */
897 imxdmac->sg_list[periods].offset = 0;
898 sg_dma_len(&imxdmac->sg_list[periods]) = 0;
899 imxdmac->sg_list[periods].page_link =
900 ((unsigned long)imxdmac->sg_list | 0x01) & ~0x02;
901
902 desc->type = IMXDMA_DESC_CYCLIC;
903 desc->sg = imxdmac->sg_list;
904 desc->sgcount = periods;
905 desc->len = IMX_DMA_LENGTH_LOOP;
906 desc->direction = direction;
907 if (direction == DMA_DEV_TO_MEM) {
908 desc->src = imxdmac->per_address;
909 } else {
910 desc->dest = imxdmac->per_address;
911 }
912 desc->desc.callback = NULL;
913 desc->desc.callback_param = NULL;
914
915 return &desc->desc;
916}
917
918static struct dma_async_tx_descriptor *imxdma_prep_dma_memcpy(
919 struct dma_chan *chan, dma_addr_t dest,
920 dma_addr_t src, size_t len, unsigned long flags)
921{
922 struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
923 struct imxdma_engine *imxdma = imxdmac->imxdma;
924 struct imxdma_desc *desc;
925
926 dev_dbg(imxdma->dev, "%s channel: %d src=0x%llx dst=0x%llx len=%zu\n",
927 __func__, imxdmac->channel, (unsigned long long)src,
928 (unsigned long long)dest, len);
929
930 if (list_empty(&imxdmac->ld_free) ||
931 imxdma_chan_is_doing_cyclic(imxdmac))
932 return NULL;
933
934 desc = list_first_entry(&imxdmac->ld_free, struct imxdma_desc, node);
935
936 desc->type = IMXDMA_DESC_MEMCPY;
937 desc->src = src;
938 desc->dest = dest;
939 desc->len = len;
940 desc->direction = DMA_MEM_TO_MEM;
941 desc->config_port = IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR;
942 desc->config_mem = IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR;
943 desc->desc.callback = NULL;
944 desc->desc.callback_param = NULL;
945
946 return &desc->desc;
947}
948
949static struct dma_async_tx_descriptor *imxdma_prep_dma_interleaved(
950 struct dma_chan *chan, struct dma_interleaved_template *xt,
951 unsigned long flags)
952{
953 struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
954 struct imxdma_engine *imxdma = imxdmac->imxdma;
955 struct imxdma_desc *desc;
956
957 dev_dbg(imxdma->dev, "%s channel: %d src_start=0x%llx dst_start=0x%llx\n"
958 " src_sgl=%s dst_sgl=%s numf=%zu frame_size=%zu\n", __func__,
959 imxdmac->channel, (unsigned long long)xt->src_start,
960 (unsigned long long) xt->dst_start,
961 xt->src_sgl ? "true" : "false", xt->dst_sgl ? "true" : "false",
962 xt->numf, xt->frame_size);
963
964 if (list_empty(&imxdmac->ld_free) ||
965 imxdma_chan_is_doing_cyclic(imxdmac))
966 return NULL;
967
968 if (xt->frame_size != 1 || xt->numf <= 0 || xt->dir != DMA_MEM_TO_MEM)
969 return NULL;
970
971 desc = list_first_entry(&imxdmac->ld_free, struct imxdma_desc, node);
972
973 desc->type = IMXDMA_DESC_INTERLEAVED;
974 desc->src = xt->src_start;
975 desc->dest = xt->dst_start;
976 desc->x = xt->sgl[0].size;
977 desc->y = xt->numf;
978 desc->w = xt->sgl[0].icg + desc->x;
979 desc->len = desc->x * desc->y;
980 desc->direction = DMA_MEM_TO_MEM;
981 desc->config_port = IMX_DMA_MEMSIZE_32;
982 desc->config_mem = IMX_DMA_MEMSIZE_32;
983 if (xt->src_sgl)
984 desc->config_mem |= IMX_DMA_TYPE_2D;
985 if (xt->dst_sgl)
986 desc->config_port |= IMX_DMA_TYPE_2D;
987 desc->desc.callback = NULL;
988 desc->desc.callback_param = NULL;
989
990 return &desc->desc;
991}
992
993static void imxdma_issue_pending(struct dma_chan *chan)
994{
995 struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
996 struct imxdma_engine *imxdma = imxdmac->imxdma;
997 struct imxdma_desc *desc;
998 unsigned long flags;
999
1000 spin_lock_irqsave(&imxdma->lock, flags);
1001 if (list_empty(&imxdmac->ld_active) &&
1002 !list_empty(&imxdmac->ld_queue)) {
1003 desc = list_first_entry(&imxdmac->ld_queue,
1004 struct imxdma_desc, node);
1005
1006 if (imxdma_xfer_desc(desc) < 0) {
1007 dev_warn(imxdma->dev,
1008 "%s: channel: %d couldn't issue DMA xfer\n",
1009 __func__, imxdmac->channel);
1010 } else {
1011 list_move_tail(imxdmac->ld_queue.next,
1012 &imxdmac->ld_active);
1013 }
1014 }
1015 spin_unlock_irqrestore(&imxdma->lock, flags);
1016}
1017
1018static bool imxdma_filter_fn(struct dma_chan *chan, void *param)
1019{
1020 struct imxdma_filter_data *fdata = param;
1021 struct imxdma_channel *imxdma_chan = to_imxdma_chan(chan);
1022
1023 if (chan->device->dev != fdata->imxdma->dev)
1024 return false;
1025
1026 imxdma_chan->dma_request = fdata->request;
1027 chan->private = NULL;
1028
1029 return true;
1030}
1031
1032static struct dma_chan *imxdma_xlate(struct of_phandle_args *dma_spec,
1033 struct of_dma *ofdma)
1034{
1035 int count = dma_spec->args_count;
1036 struct imxdma_engine *imxdma = ofdma->of_dma_data;
1037 struct imxdma_filter_data fdata = {
1038 .imxdma = imxdma,
1039 };
1040
1041 if (count != 1)
1042 return NULL;
1043
1044 fdata.request = dma_spec->args[0];
1045
1046 return dma_request_channel(imxdma->dma_device.cap_mask,
1047 imxdma_filter_fn, &fdata);
1048}
1049
1050static int __init imxdma_probe(struct platform_device *pdev)
1051 {
1052 struct imxdma_engine *imxdma;
1053 struct resource *res;
1054 const struct of_device_id *of_id;
1055 int ret, i;
1056 int irq, irq_err;
1057
1058 of_id = of_match_device(imx_dma_of_dev_id, &pdev->dev);
1059 if (of_id)
1060 pdev->id_entry = of_id->data;
1061
1062 imxdma = devm_kzalloc(&pdev->dev, sizeof(*imxdma), GFP_KERNEL);
1063 if (!imxdma)
1064 return -ENOMEM;
1065
1066 imxdma->dev = &pdev->dev;
1067 imxdma->devtype = pdev->id_entry->driver_data;
1068
1069 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1070 imxdma->base = devm_ioremap_resource(&pdev->dev, res);
1071 if (IS_ERR(imxdma->base))
1072 return PTR_ERR(imxdma->base);
1073
1074 irq = platform_get_irq(pdev, 0);
1075 if (irq < 0)
1076 return irq;
1077
1078 imxdma->dma_ipg = devm_clk_get(&pdev->dev, "ipg");
1079 if (IS_ERR(imxdma->dma_ipg))
1080 return PTR_ERR(imxdma->dma_ipg);
1081
1082 imxdma->dma_ahb = devm_clk_get(&pdev->dev, "ahb");
1083 if (IS_ERR(imxdma->dma_ahb))
1084 return PTR_ERR(imxdma->dma_ahb);
1085
1086 ret = clk_prepare_enable(imxdma->dma_ipg);
1087 if (ret)
1088 return ret;
1089 ret = clk_prepare_enable(imxdma->dma_ahb);
1090 if (ret)
1091 goto disable_dma_ipg_clk;
1092
1093 /* reset DMA module */
1094 imx_dmav1_writel(imxdma, DCR_DRST, DMA_DCR);
1095
1096 if (is_imx1_dma(imxdma)) {
1097 ret = devm_request_irq(&pdev->dev, irq,
1098 dma_irq_handler, 0, "DMA", imxdma);
1099 if (ret) {
1100 dev_warn(imxdma->dev, "Can't register IRQ for DMA\n");
1101 goto disable_dma_ahb_clk;
1102 }
1103
1104 irq_err = platform_get_irq(pdev, 1);
1105 if (irq_err < 0) {
1106 ret = irq_err;
1107 goto disable_dma_ahb_clk;
1108 }
1109
1110 ret = devm_request_irq(&pdev->dev, irq_err,
1111 imxdma_err_handler, 0, "DMA", imxdma);
1112 if (ret) {
1113 dev_warn(imxdma->dev, "Can't register ERRIRQ for DMA\n");
1114 goto disable_dma_ahb_clk;
1115 }
1116 }
1117
1118 /* enable DMA module */
1119 imx_dmav1_writel(imxdma, DCR_DEN, DMA_DCR);
1120
1121 /* clear all interrupts */
1122 imx_dmav1_writel(imxdma, (1 << IMX_DMA_CHANNELS) - 1, DMA_DISR);
1123
1124 /* disable interrupts */
1125 imx_dmav1_writel(imxdma, (1 << IMX_DMA_CHANNELS) - 1, DMA_DIMR);
1126
1127 INIT_LIST_HEAD(&imxdma->dma_device.channels);
1128
1129 dma_cap_set(DMA_SLAVE, imxdma->dma_device.cap_mask);
1130 dma_cap_set(DMA_CYCLIC, imxdma->dma_device.cap_mask);
1131 dma_cap_set(DMA_MEMCPY, imxdma->dma_device.cap_mask);
1132 dma_cap_set(DMA_INTERLEAVE, imxdma->dma_device.cap_mask);
1133
1134 /* Initialize 2D global parameters */
1135 for (i = 0; i < IMX_DMA_2D_SLOTS; i++)
1136 imxdma->slots_2d[i].count = 0;
1137
1138 spin_lock_init(&imxdma->lock);
1139
1140 /* Initialize channel parameters */
1141 for (i = 0; i < IMX_DMA_CHANNELS; i++) {
1142 struct imxdma_channel *imxdmac = &imxdma->channel[i];
1143
1144 if (!is_imx1_dma(imxdma)) {
1145 ret = devm_request_irq(&pdev->dev, irq + i,
1146 dma_irq_handler, 0, "DMA", imxdma);
1147 if (ret) {
1148 dev_warn(imxdma->dev, "Can't register IRQ %d "
1149 "for DMA channel %d\n",
1150 irq + i, i);
1151 goto disable_dma_ahb_clk;
1152 }
1153 init_timer(&imxdmac->watchdog);
1154 imxdmac->watchdog.function = &imxdma_watchdog;
1155 imxdmac->watchdog.data = (unsigned long)imxdmac;
1156 }
1157
1158 imxdmac->imxdma = imxdma;
1159
1160 INIT_LIST_HEAD(&imxdmac->ld_queue);
1161 INIT_LIST_HEAD(&imxdmac->ld_free);
1162 INIT_LIST_HEAD(&imxdmac->ld_active);
1163
1164 tasklet_init(&imxdmac->dma_tasklet, imxdma_tasklet,
1165 (unsigned long)imxdmac);
1166 imxdmac->chan.device = &imxdma->dma_device;
1167 dma_cookie_init(&imxdmac->chan);
1168 imxdmac->channel = i;
1169
1170 /* Add the channel to the DMAC list */
1171 list_add_tail(&imxdmac->chan.device_node,
1172 &imxdma->dma_device.channels);
1173 }
1174
1175 imxdma->dma_device.dev = &pdev->dev;
1176
1177 imxdma->dma_device.device_alloc_chan_resources = imxdma_alloc_chan_resources;
1178 imxdma->dma_device.device_free_chan_resources = imxdma_free_chan_resources;
1179 imxdma->dma_device.device_tx_status = imxdma_tx_status;
1180 imxdma->dma_device.device_prep_slave_sg = imxdma_prep_slave_sg;
1181 imxdma->dma_device.device_prep_dma_cyclic = imxdma_prep_dma_cyclic;
1182 imxdma->dma_device.device_prep_dma_memcpy = imxdma_prep_dma_memcpy;
1183 imxdma->dma_device.device_prep_interleaved_dma = imxdma_prep_dma_interleaved;
1184 imxdma->dma_device.device_config = imxdma_config;
1185 imxdma->dma_device.device_terminate_all = imxdma_terminate_all;
1186 imxdma->dma_device.device_issue_pending = imxdma_issue_pending;
1187
1188 platform_set_drvdata(pdev, imxdma);
1189
1190 imxdma->dma_device.copy_align = DMAENGINE_ALIGN_4_BYTES;
1191 imxdma->dma_device.dev->dma_parms = &imxdma->dma_parms;
1192 dma_set_max_seg_size(imxdma->dma_device.dev, 0xffffff);
1193
1194 ret = dma_async_device_register(&imxdma->dma_device);
1195 if (ret) {
1196 dev_err(&pdev->dev, "unable to register\n");
1197 goto disable_dma_ahb_clk;
1198 }
1199
1200 if (pdev->dev.of_node) {
1201 ret = of_dma_controller_register(pdev->dev.of_node,
1202 imxdma_xlate, imxdma);
1203 if (ret) {
1204 dev_err(&pdev->dev, "unable to register of_dma_controller\n");
1205 goto err_of_dma_controller;
1206 }
1207 }
1208
1209 return 0;
1210
1211err_of_dma_controller:
1212 dma_async_device_unregister(&imxdma->dma_device);
1213disable_dma_ahb_clk:
1214 clk_disable_unprepare(imxdma->dma_ahb);
1215disable_dma_ipg_clk:
1216 clk_disable_unprepare(imxdma->dma_ipg);
1217 return ret;
1218}
1219
1220static int imxdma_remove(struct platform_device *pdev)
1221{
1222 struct imxdma_engine *imxdma = platform_get_drvdata(pdev);
1223
1224 dma_async_device_unregister(&imxdma->dma_device);
1225
1226 if (pdev->dev.of_node)
1227 of_dma_controller_free(pdev->dev.of_node);
1228
1229 clk_disable_unprepare(imxdma->dma_ipg);
1230 clk_disable_unprepare(imxdma->dma_ahb);
1231
1232 return 0;
1233}
1234
1235static struct platform_driver imxdma_driver = {
1236 .driver = {
1237 .name = "imx-dma",
1238 .of_match_table = imx_dma_of_dev_id,
1239 },
1240 .id_table = imx_dma_devtype,
1241 .remove = imxdma_remove,
1242};
1243
1244static int __init imxdma_module_init(void)
1245{
1246 return platform_driver_probe(&imxdma_driver, imxdma_probe);
1247}
1248subsys_initcall(imxdma_module_init);
1249
1250MODULE_AUTHOR("Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>");
1251MODULE_DESCRIPTION("i.MX dma driver");
1252MODULE_LICENSE("GPL");
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 *
9 * The code contained herein is licensed under the GNU General Public
10 * License. You may obtain a copy of the GNU General Public License
11 * Version 2 or later at the following locations:
12 *
13 * http://www.opensource.org/licenses/gpl-license.html
14 * http://www.gnu.org/copyleft/gpl.html
15 */
16#include <linux/init.h>
17#include <linux/types.h>
18#include <linux/mm.h>
19#include <linux/interrupt.h>
20#include <linux/spinlock.h>
21#include <linux/device.h>
22#include <linux/dma-mapping.h>
23#include <linux/slab.h>
24#include <linux/platform_device.h>
25#include <linux/dmaengine.h>
26
27#include <asm/irq.h>
28#include <mach/dma-v1.h>
29#include <mach/hardware.h>
30
31struct imxdma_channel {
32 struct imxdma_engine *imxdma;
33 unsigned int channel;
34 unsigned int imxdma_channel;
35
36 enum dma_slave_buswidth word_size;
37 dma_addr_t per_address;
38 u32 watermark_level;
39 struct dma_chan chan;
40 spinlock_t lock;
41 struct dma_async_tx_descriptor desc;
42 dma_cookie_t last_completed;
43 enum dma_status status;
44 int dma_request;
45 struct scatterlist *sg_list;
46};
47
48#define MAX_DMA_CHANNELS 8
49
50struct imxdma_engine {
51 struct device *dev;
52 struct device_dma_parameters dma_parms;
53 struct dma_device dma_device;
54 struct imxdma_channel channel[MAX_DMA_CHANNELS];
55};
56
57static struct imxdma_channel *to_imxdma_chan(struct dma_chan *chan)
58{
59 return container_of(chan, struct imxdma_channel, chan);
60}
61
62static void imxdma_handle(struct imxdma_channel *imxdmac)
63{
64 if (imxdmac->desc.callback)
65 imxdmac->desc.callback(imxdmac->desc.callback_param);
66 imxdmac->last_completed = imxdmac->desc.cookie;
67}
68
69static void imxdma_irq_handler(int channel, void *data)
70{
71 struct imxdma_channel *imxdmac = data;
72
73 imxdmac->status = DMA_SUCCESS;
74 imxdma_handle(imxdmac);
75}
76
77static void imxdma_err_handler(int channel, void *data, int error)
78{
79 struct imxdma_channel *imxdmac = data;
80
81 imxdmac->status = DMA_ERROR;
82 imxdma_handle(imxdmac);
83}
84
85static void imxdma_progression(int channel, void *data,
86 struct scatterlist *sg)
87{
88 struct imxdma_channel *imxdmac = data;
89
90 imxdmac->status = DMA_SUCCESS;
91 imxdma_handle(imxdmac);
92}
93
94static int imxdma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
95 unsigned long arg)
96{
97 struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
98 struct dma_slave_config *dmaengine_cfg = (void *)arg;
99 int ret;
100 unsigned int mode = 0;
101
102 switch (cmd) {
103 case DMA_TERMINATE_ALL:
104 imxdmac->status = DMA_ERROR;
105 imx_dma_disable(imxdmac->imxdma_channel);
106 return 0;
107 case DMA_SLAVE_CONFIG:
108 if (dmaengine_cfg->direction == DMA_FROM_DEVICE) {
109 imxdmac->per_address = dmaengine_cfg->src_addr;
110 imxdmac->watermark_level = dmaengine_cfg->src_maxburst;
111 imxdmac->word_size = dmaengine_cfg->src_addr_width;
112 } else {
113 imxdmac->per_address = dmaengine_cfg->dst_addr;
114 imxdmac->watermark_level = dmaengine_cfg->dst_maxburst;
115 imxdmac->word_size = dmaengine_cfg->dst_addr_width;
116 }
117
118 switch (imxdmac->word_size) {
119 case DMA_SLAVE_BUSWIDTH_1_BYTE:
120 mode = IMX_DMA_MEMSIZE_8;
121 break;
122 case DMA_SLAVE_BUSWIDTH_2_BYTES:
123 mode = IMX_DMA_MEMSIZE_16;
124 break;
125 default:
126 case DMA_SLAVE_BUSWIDTH_4_BYTES:
127 mode = IMX_DMA_MEMSIZE_32;
128 break;
129 }
130 ret = imx_dma_config_channel(imxdmac->imxdma_channel,
131 mode | IMX_DMA_TYPE_FIFO,
132 IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR,
133 imxdmac->dma_request, 1);
134
135 if (ret)
136 return ret;
137
138 imx_dma_config_burstlen(imxdmac->imxdma_channel,
139 imxdmac->watermark_level * imxdmac->word_size);
140
141 return 0;
142 default:
143 return -ENOSYS;
144 }
145
146 return -EINVAL;
147}
148
149static enum dma_status imxdma_tx_status(struct dma_chan *chan,
150 dma_cookie_t cookie,
151 struct dma_tx_state *txstate)
152{
153 struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
154 dma_cookie_t last_used;
155 enum dma_status ret;
156
157 last_used = chan->cookie;
158
159 ret = dma_async_is_complete(cookie, imxdmac->last_completed, last_used);
160 dma_set_tx_state(txstate, imxdmac->last_completed, last_used, 0);
161
162 return ret;
163}
164
165static dma_cookie_t imxdma_assign_cookie(struct imxdma_channel *imxdma)
166{
167 dma_cookie_t cookie = imxdma->chan.cookie;
168
169 if (++cookie < 0)
170 cookie = 1;
171
172 imxdma->chan.cookie = cookie;
173 imxdma->desc.cookie = cookie;
174
175 return cookie;
176}
177
178static dma_cookie_t imxdma_tx_submit(struct dma_async_tx_descriptor *tx)
179{
180 struct imxdma_channel *imxdmac = to_imxdma_chan(tx->chan);
181 dma_cookie_t cookie;
182
183 spin_lock_irq(&imxdmac->lock);
184
185 cookie = imxdma_assign_cookie(imxdmac);
186
187 imx_dma_enable(imxdmac->imxdma_channel);
188
189 spin_unlock_irq(&imxdmac->lock);
190
191 return cookie;
192}
193
194static int imxdma_alloc_chan_resources(struct dma_chan *chan)
195{
196 struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
197 struct imx_dma_data *data = chan->private;
198
199 imxdmac->dma_request = data->dma_request;
200
201 dma_async_tx_descriptor_init(&imxdmac->desc, chan);
202 imxdmac->desc.tx_submit = imxdma_tx_submit;
203 /* txd.flags will be overwritten in prep funcs */
204 imxdmac->desc.flags = DMA_CTRL_ACK;
205
206 imxdmac->status = DMA_SUCCESS;
207
208 return 0;
209}
210
211static void imxdma_free_chan_resources(struct dma_chan *chan)
212{
213 struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
214
215 imx_dma_disable(imxdmac->imxdma_channel);
216
217 if (imxdmac->sg_list) {
218 kfree(imxdmac->sg_list);
219 imxdmac->sg_list = NULL;
220 }
221}
222
223static struct dma_async_tx_descriptor *imxdma_prep_slave_sg(
224 struct dma_chan *chan, struct scatterlist *sgl,
225 unsigned int sg_len, enum dma_data_direction direction,
226 unsigned long flags)
227{
228 struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
229 struct scatterlist *sg;
230 int i, ret, dma_length = 0;
231 unsigned int dmamode;
232
233 if (imxdmac->status == DMA_IN_PROGRESS)
234 return NULL;
235
236 imxdmac->status = DMA_IN_PROGRESS;
237
238 for_each_sg(sgl, sg, sg_len, i) {
239 dma_length += sg->length;
240 }
241
242 if (direction == DMA_FROM_DEVICE)
243 dmamode = DMA_MODE_READ;
244 else
245 dmamode = DMA_MODE_WRITE;
246
247 switch (imxdmac->word_size) {
248 case DMA_SLAVE_BUSWIDTH_4_BYTES:
249 if (sgl->length & 3 || sgl->dma_address & 3)
250 return NULL;
251 break;
252 case DMA_SLAVE_BUSWIDTH_2_BYTES:
253 if (sgl->length & 1 || sgl->dma_address & 1)
254 return NULL;
255 break;
256 case DMA_SLAVE_BUSWIDTH_1_BYTE:
257 break;
258 default:
259 return NULL;
260 }
261
262 ret = imx_dma_setup_sg(imxdmac->imxdma_channel, sgl, sg_len,
263 dma_length, imxdmac->per_address, dmamode);
264 if (ret)
265 return NULL;
266
267 return &imxdmac->desc;
268}
269
270static struct dma_async_tx_descriptor *imxdma_prep_dma_cyclic(
271 struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len,
272 size_t period_len, enum dma_data_direction direction)
273{
274 struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
275 struct imxdma_engine *imxdma = imxdmac->imxdma;
276 int i, ret;
277 unsigned int periods = buf_len / period_len;
278 unsigned int dmamode;
279
280 dev_dbg(imxdma->dev, "%s channel: %d buf_len=%d period_len=%d\n",
281 __func__, imxdmac->channel, buf_len, period_len);
282
283 if (imxdmac->status == DMA_IN_PROGRESS)
284 return NULL;
285 imxdmac->status = DMA_IN_PROGRESS;
286
287 ret = imx_dma_setup_progression_handler(imxdmac->imxdma_channel,
288 imxdma_progression);
289 if (ret) {
290 dev_err(imxdma->dev, "Failed to setup the DMA handler\n");
291 return NULL;
292 }
293
294 if (imxdmac->sg_list)
295 kfree(imxdmac->sg_list);
296
297 imxdmac->sg_list = kcalloc(periods + 1,
298 sizeof(struct scatterlist), GFP_KERNEL);
299 if (!imxdmac->sg_list)
300 return NULL;
301
302 sg_init_table(imxdmac->sg_list, periods);
303
304 for (i = 0; i < periods; i++) {
305 imxdmac->sg_list[i].page_link = 0;
306 imxdmac->sg_list[i].offset = 0;
307 imxdmac->sg_list[i].dma_address = dma_addr;
308 imxdmac->sg_list[i].length = period_len;
309 dma_addr += period_len;
310 }
311
312 /* close the loop */
313 imxdmac->sg_list[periods].offset = 0;
314 imxdmac->sg_list[periods].length = 0;
315 imxdmac->sg_list[periods].page_link =
316 ((unsigned long)imxdmac->sg_list | 0x01) & ~0x02;
317
318 if (direction == DMA_FROM_DEVICE)
319 dmamode = DMA_MODE_READ;
320 else
321 dmamode = DMA_MODE_WRITE;
322
323 ret = imx_dma_setup_sg(imxdmac->imxdma_channel, imxdmac->sg_list, periods,
324 IMX_DMA_LENGTH_LOOP, imxdmac->per_address, dmamode);
325 if (ret)
326 return NULL;
327
328 return &imxdmac->desc;
329}
330
331static void imxdma_issue_pending(struct dma_chan *chan)
332{
333 /*
334 * Nothing to do. We only have a single descriptor
335 */
336}
337
338static int __init imxdma_probe(struct platform_device *pdev)
339{
340 struct imxdma_engine *imxdma;
341 int ret, i;
342
343 imxdma = kzalloc(sizeof(*imxdma), GFP_KERNEL);
344 if (!imxdma)
345 return -ENOMEM;
346
347 INIT_LIST_HEAD(&imxdma->dma_device.channels);
348
349 dma_cap_set(DMA_SLAVE, imxdma->dma_device.cap_mask);
350 dma_cap_set(DMA_CYCLIC, imxdma->dma_device.cap_mask);
351
352 /* Initialize channel parameters */
353 for (i = 0; i < MAX_DMA_CHANNELS; i++) {
354 struct imxdma_channel *imxdmac = &imxdma->channel[i];
355
356 imxdmac->imxdma_channel = imx_dma_request_by_prio("dmaengine",
357 DMA_PRIO_MEDIUM);
358 if ((int)imxdmac->channel < 0) {
359 ret = -ENODEV;
360 goto err_init;
361 }
362
363 imx_dma_setup_handlers(imxdmac->imxdma_channel,
364 imxdma_irq_handler, imxdma_err_handler, imxdmac);
365
366 imxdmac->imxdma = imxdma;
367 spin_lock_init(&imxdmac->lock);
368
369 imxdmac->chan.device = &imxdma->dma_device;
370 imxdmac->channel = i;
371
372 /* Add the channel to the DMAC list */
373 list_add_tail(&imxdmac->chan.device_node, &imxdma->dma_device.channels);
374 }
375
376 imxdma->dev = &pdev->dev;
377 imxdma->dma_device.dev = &pdev->dev;
378
379 imxdma->dma_device.device_alloc_chan_resources = imxdma_alloc_chan_resources;
380 imxdma->dma_device.device_free_chan_resources = imxdma_free_chan_resources;
381 imxdma->dma_device.device_tx_status = imxdma_tx_status;
382 imxdma->dma_device.device_prep_slave_sg = imxdma_prep_slave_sg;
383 imxdma->dma_device.device_prep_dma_cyclic = imxdma_prep_dma_cyclic;
384 imxdma->dma_device.device_control = imxdma_control;
385 imxdma->dma_device.device_issue_pending = imxdma_issue_pending;
386
387 platform_set_drvdata(pdev, imxdma);
388
389 imxdma->dma_device.dev->dma_parms = &imxdma->dma_parms;
390 dma_set_max_seg_size(imxdma->dma_device.dev, 0xffffff);
391
392 ret = dma_async_device_register(&imxdma->dma_device);
393 if (ret) {
394 dev_err(&pdev->dev, "unable to register\n");
395 goto err_init;
396 }
397
398 return 0;
399
400err_init:
401 while (--i >= 0) {
402 struct imxdma_channel *imxdmac = &imxdma->channel[i];
403 imx_dma_free(imxdmac->imxdma_channel);
404 }
405
406 kfree(imxdma);
407 return ret;
408}
409
410static int __exit imxdma_remove(struct platform_device *pdev)
411{
412 struct imxdma_engine *imxdma = platform_get_drvdata(pdev);
413 int i;
414
415 dma_async_device_unregister(&imxdma->dma_device);
416
417 for (i = 0; i < MAX_DMA_CHANNELS; i++) {
418 struct imxdma_channel *imxdmac = &imxdma->channel[i];
419
420 imx_dma_free(imxdmac->imxdma_channel);
421 }
422
423 kfree(imxdma);
424
425 return 0;
426}
427
428static struct platform_driver imxdma_driver = {
429 .driver = {
430 .name = "imx-dma",
431 },
432 .remove = __exit_p(imxdma_remove),
433};
434
435static int __init imxdma_module_init(void)
436{
437 return platform_driver_probe(&imxdma_driver, imxdma_probe);
438}
439subsys_initcall(imxdma_module_init);
440
441MODULE_AUTHOR("Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>");
442MODULE_DESCRIPTION("i.MX dma driver");
443MODULE_LICENSE("GPL");