2 * drivers/dma/imx-dma.c
4 * This file contains a driver for the Freescale i.MX DMA engine
7 * Copyright 2010 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>
8 * Copyright 2012 Javier Martin, Vista Silicon <javier.martin@vista-silicon.com>
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:
14 * http://www.opensource.org/licenses/gpl-license.html
15 * http://www.gnu.org/copyleft/gpl.html
17 #include <linux/init.h>
18 #include <linux/types.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>
32 #include <mach/hardware.h>
34 #include "dmaengine.h"
35 #define IMXDMA_MAX_CHAN_DESCRIPTORS 16
36 #define IMX_DMA_CHANNELS 16
38 #define IMX_DMA_2D_SLOTS 2
39 #define IMX_DMA_2D_SLOT_A 0
40 #define IMX_DMA_2D_SLOT_B 1
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)
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)
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 */
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)
110 enum imxdma_prep_type
{
112 IMXDMA_DESC_INTERLEAVED
,
113 IMXDMA_DESC_SLAVE_SG
,
117 struct imx_dma_2d_config
{
125 struct list_head node
;
126 struct dma_async_tx_descriptor desc
;
127 enum dma_status status
;
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 */
140 /* For slave sg and cyclic */
141 struct scatterlist
*sg
;
142 unsigned int sgcount
;
145 struct imxdma_channel
{
147 struct timer_list watchdog
;
148 struct imxdma_engine
*imxdma
;
149 unsigned int channel
;
151 struct tasklet_struct dma_tasklet
;
152 struct list_head ld_free
;
153 struct list_head ld_queue
;
154 struct list_head ld_active
;
156 enum dma_slave_buswidth word_size
;
157 dma_addr_t per_address
;
159 struct dma_chan chan
;
160 struct dma_async_tx_descriptor desc
;
161 enum dma_status status
;
163 struct scatterlist
*sg_list
;
170 struct imxdma_engine
{
172 struct device_dma_parameters dma_parms
;
173 struct dma_device dma_device
;
177 struct imx_dma_2d_config slots_2d
[IMX_DMA_2D_SLOTS
];
178 struct imxdma_channel channel
[IMX_DMA_CHANNELS
];
181 static struct imxdma_channel
*to_imxdma_chan(struct dma_chan
*chan
)
183 return container_of(chan
, struct imxdma_channel
, chan
);
186 static inline bool imxdma_chan_is_doing_cyclic(struct imxdma_channel
*imxdmac
)
188 struct imxdma_desc
*desc
;
190 if (!list_empty(&imxdmac
->ld_active
)) {
191 desc
= list_first_entry(&imxdmac
->ld_active
, struct imxdma_desc
,
193 if (desc
->type
== IMXDMA_DESC_CYCLIC
)
201 static void imx_dmav1_writel(struct imxdma_engine
*imxdma
, unsigned val
,
204 __raw_writel(val
, imxdma
->base
+ offset
);
207 static unsigned imx_dmav1_readl(struct imxdma_engine
*imxdma
, unsigned offset
)
209 return __raw_readl(imxdma
->base
+ offset
);
212 static int imxdma_hw_chain(struct imxdma_channel
*imxdmac
)
215 return imxdmac
->hw_chaining
;
221 * imxdma_sg_next - prepare next chunk for scatter-gather DMA emulation
223 static inline int imxdma_sg_next(struct imxdma_desc
*d
)
225 struct imxdma_channel
*imxdmac
= to_imxdma_chan(d
->desc
.chan
);
226 struct imxdma_engine
*imxdma
= imxdmac
->imxdma
;
227 struct scatterlist
*sg
= d
->sg
;
230 now
= min(d
->len
, sg
->length
);
231 if (d
->len
!= IMX_DMA_LENGTH_LOOP
)
234 if (d
->direction
== DMA_DEV_TO_MEM
)
235 imx_dmav1_writel(imxdma
, sg
->dma_address
,
236 DMA_DAR(imxdmac
->channel
));
238 imx_dmav1_writel(imxdma
, sg
->dma_address
,
239 DMA_SAR(imxdmac
->channel
));
241 imx_dmav1_writel(imxdma
, now
, DMA_CNTR(imxdmac
->channel
));
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
)));
252 static void imxdma_enable_hw(struct imxdma_desc
*d
)
254 struct imxdma_channel
*imxdmac
= to_imxdma_chan(d
->desc
.chan
);
255 struct imxdma_engine
*imxdma
= imxdmac
->imxdma
;
256 int channel
= imxdmac
->channel
;
259 dev_dbg(imxdma
->dev
, "%s channel %d\n", __func__
, channel
);
261 local_irq_save(flags
);
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
));
269 if ((cpu_is_mx21() || cpu_is_mx27()) &&
270 d
->sg
&& imxdma_hw_chain(imxdmac
)) {
271 d
->sg
= sg_next(d
->sg
);
275 tmp
= imx_dmav1_readl(imxdma
, DMA_CCR(channel
));
276 imx_dmav1_writel(imxdma
, tmp
| CCR_RPT
| CCR_ACRPT
,
281 local_irq_restore(flags
);
284 static void imxdma_disable_hw(struct imxdma_channel
*imxdmac
)
286 struct imxdma_engine
*imxdma
= imxdmac
->imxdma
;
287 int channel
= imxdmac
->channel
;
290 dev_dbg(imxdma
->dev
, "%s channel %d\n", __func__
, channel
);
292 if (imxdma_hw_chain(imxdmac
))
293 del_timer(&imxdmac
->watchdog
);
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
);
304 static void imxdma_watchdog(unsigned long data
)
306 struct imxdma_channel
*imxdmac
= (struct imxdma_channel
*)data
;
307 struct imxdma_engine
*imxdma
= imxdmac
->imxdma
;
308 int channel
= imxdmac
->channel
;
310 imx_dmav1_writel(imxdma
, 0, DMA_CCR(channel
));
312 /* Tasklet watchdog error handler */
313 tasklet_schedule(&imxdmac
->dma_tasklet
);
314 dev_dbg(imxdma
->dev
, "channel %d: watchdog timeout!\n",
318 static irqreturn_t
imxdma_err_handler(int irq
, void *dev_id
)
320 struct imxdma_engine
*imxdma
= dev_id
;
321 unsigned int err_mask
;
325 disr
= imx_dmav1_readl(imxdma
, DMA_DISR
);
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
);
335 imx_dmav1_writel(imxdma
, disr
& err_mask
, DMA_DISR
);
337 for (i
= 0; i
< IMX_DMA_CHANNELS
; i
++) {
338 if (!(err_mask
& (1 << i
)))
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
;
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
;
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
;
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
;
358 /* Tasklet error handler */
359 tasklet_schedule(&imxdma
->channel
[i
].dma_tasklet
);
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" : "");
371 static void dma_irq_handle_channel(struct imxdma_channel
*imxdmac
)
373 struct imxdma_engine
*imxdma
= imxdmac
->imxdma
;
374 int chno
= imxdmac
->channel
;
375 struct imxdma_desc
*desc
;
377 spin_lock(&imxdma
->lock
);
378 if (list_empty(&imxdmac
->ld_active
)) {
379 spin_unlock(&imxdma
->lock
);
383 desc
= list_first_entry(&imxdmac
->ld_active
,
386 spin_unlock(&imxdma
->lock
);
390 desc
->sg
= sg_next(desc
->sg
);
393 imxdma_sg_next(desc
);
395 tmp
= imx_dmav1_readl(imxdma
, DMA_CCR(chno
));
397 if (imxdma_hw_chain(imxdmac
)) {
398 /* FIXME: The timeout should probably be
401 mod_timer(&imxdmac
->watchdog
,
402 jiffies
+ msecs_to_jiffies(500));
404 tmp
|= CCR_CEN
| CCR_RPT
| CCR_ACRPT
;
405 imx_dmav1_writel(imxdma
, tmp
, DMA_CCR(chno
));
407 imx_dmav1_writel(imxdma
, tmp
& ~CCR_CEN
,
412 imx_dmav1_writel(imxdma
, tmp
, DMA_CCR(chno
));
414 if (imxdma_chan_is_doing_cyclic(imxdmac
))
415 /* Tasklet progression */
416 tasklet_schedule(&imxdmac
->dma_tasklet
);
421 if (imxdma_hw_chain(imxdmac
)) {
422 del_timer(&imxdmac
->watchdog
);
428 imx_dmav1_writel(imxdma
, 0, DMA_CCR(chno
));
430 tasklet_schedule(&imxdmac
->dma_tasklet
);
433 static irqreturn_t
dma_irq_handler(int irq
, void *dev_id
)
435 struct imxdma_engine
*imxdma
= dev_id
;
438 if (cpu_is_mx21() || cpu_is_mx27())
439 imxdma_err_handler(irq
, dev_id
);
441 disr
= imx_dmav1_readl(imxdma
, DMA_DISR
);
443 dev_dbg(imxdma
->dev
, "%s called, disr=0x%08x\n", __func__
, disr
);
445 imx_dmav1_writel(imxdma
, disr
, DMA_DISR
);
446 for (i
= 0; i
< IMX_DMA_CHANNELS
; i
++) {
448 dma_irq_handle_channel(&imxdma
->channel
[i
]);
454 static int imxdma_xfer_desc(struct imxdma_desc
*d
)
456 struct imxdma_channel
*imxdmac
= to_imxdma_chan(d
->desc
.chan
);
457 struct imxdma_engine
*imxdma
= imxdmac
->imxdma
;
462 /* Configure and enable */
464 case IMXDMA_DESC_INTERLEAVED
:
465 /* Try to get a free 2D slot */
466 spin_lock_irqsave(&imxdma
->lock
, flags
);
467 for (i
= 0; i
< IMX_DMA_2D_SLOTS
; i
++) {
468 if ((imxdma
->slots_2d
[i
].count
> 0) &&
469 ((imxdma
->slots_2d
[i
].xsr
!= d
->x
) ||
470 (imxdma
->slots_2d
[i
].ysr
!= d
->y
) ||
471 (imxdma
->slots_2d
[i
].wsr
!= d
->w
)))
479 imxdma
->slots_2d
[slot
].xsr
= d
->x
;
480 imxdma
->slots_2d
[slot
].ysr
= d
->y
;
481 imxdma
->slots_2d
[slot
].wsr
= d
->w
;
482 imxdma
->slots_2d
[slot
].count
++;
484 imxdmac
->slot_2d
= slot
;
485 imxdmac
->enabled_2d
= true;
486 spin_unlock_irqrestore(&imxdma
->lock
, flags
);
488 if (slot
== IMX_DMA_2D_SLOT_A
) {
489 d
->config_mem
&= ~CCR_MSEL_B
;
490 d
->config_port
&= ~CCR_MSEL_B
;
491 imx_dmav1_writel(imxdma
, d
->x
, DMA_XSRA
);
492 imx_dmav1_writel(imxdma
, d
->y
, DMA_YSRA
);
493 imx_dmav1_writel(imxdma
, d
->w
, DMA_WSRA
);
495 d
->config_mem
|= CCR_MSEL_B
;
496 d
->config_port
|= CCR_MSEL_B
;
497 imx_dmav1_writel(imxdma
, d
->x
, DMA_XSRB
);
498 imx_dmav1_writel(imxdma
, d
->y
, DMA_YSRB
);
499 imx_dmav1_writel(imxdma
, d
->w
, DMA_WSRB
);
502 * We fall-through here intentionally, since a 2D transfer is
503 * similar to MEMCPY just adding the 2D slot configuration.
505 case IMXDMA_DESC_MEMCPY
:
506 imx_dmav1_writel(imxdma
, d
->src
, DMA_SAR(imxdmac
->channel
));
507 imx_dmav1_writel(imxdma
, d
->dest
, DMA_DAR(imxdmac
->channel
));
508 imx_dmav1_writel(imxdma
, d
->config_mem
| (d
->config_port
<< 2),
509 DMA_CCR(imxdmac
->channel
));
511 imx_dmav1_writel(imxdma
, d
->len
, DMA_CNTR(imxdmac
->channel
));
513 dev_dbg(imxdma
->dev
, "%s channel: %d dest=0x%08x src=0x%08x "
514 "dma_length=%d\n", __func__
, imxdmac
->channel
,
515 d
->dest
, d
->src
, d
->len
);
518 /* Cyclic transfer is the same as slave_sg with special sg configuration. */
519 case IMXDMA_DESC_CYCLIC
:
520 case IMXDMA_DESC_SLAVE_SG
:
521 if (d
->direction
== DMA_DEV_TO_MEM
) {
522 imx_dmav1_writel(imxdma
, imxdmac
->per_address
,
523 DMA_SAR(imxdmac
->channel
));
524 imx_dmav1_writel(imxdma
, imxdmac
->ccr_from_device
,
525 DMA_CCR(imxdmac
->channel
));
527 dev_dbg(imxdma
->dev
, "%s channel: %d sg=%p sgcount=%d "
528 "total length=%d dev_addr=0x%08x (dev2mem)\n",
529 __func__
, imxdmac
->channel
, d
->sg
, d
->sgcount
,
530 d
->len
, imxdmac
->per_address
);
531 } else if (d
->direction
== DMA_MEM_TO_DEV
) {
532 imx_dmav1_writel(imxdma
, imxdmac
->per_address
,
533 DMA_DAR(imxdmac
->channel
));
534 imx_dmav1_writel(imxdma
, imxdmac
->ccr_to_device
,
535 DMA_CCR(imxdmac
->channel
));
537 dev_dbg(imxdma
->dev
, "%s channel: %d sg=%p sgcount=%d "
538 "total length=%d dev_addr=0x%08x (mem2dev)\n",
539 __func__
, imxdmac
->channel
, d
->sg
, d
->sgcount
,
540 d
->len
, imxdmac
->per_address
);
542 dev_err(imxdma
->dev
, "%s channel: %d bad dma mode\n",
543 __func__
, imxdmac
->channel
);
557 static void imxdma_tasklet(unsigned long data
)
559 struct imxdma_channel
*imxdmac
= (void *)data
;
560 struct imxdma_engine
*imxdma
= imxdmac
->imxdma
;
561 struct imxdma_desc
*desc
;
563 spin_lock(&imxdma
->lock
);
565 if (list_empty(&imxdmac
->ld_active
)) {
566 /* Someone might have called terminate all */
569 desc
= list_first_entry(&imxdmac
->ld_active
, struct imxdma_desc
, node
);
571 if (desc
->desc
.callback
)
572 desc
->desc
.callback(desc
->desc
.callback_param
);
574 /* If we are dealing with a cyclic descriptor keep it on ld_active
575 * and dont mark the descripor as complete.
576 * Only in non-cyclic cases it would be marked as complete
578 if (imxdma_chan_is_doing_cyclic(imxdmac
))
581 dma_cookie_complete(&desc
->desc
);
583 /* Free 2D slot if it was an interleaved transfer */
584 if (imxdmac
->enabled_2d
) {
585 imxdma
->slots_2d
[imxdmac
->slot_2d
].count
--;
586 imxdmac
->enabled_2d
= false;
589 list_move_tail(imxdmac
->ld_active
.next
, &imxdmac
->ld_free
);
591 if (!list_empty(&imxdmac
->ld_queue
)) {
592 desc
= list_first_entry(&imxdmac
->ld_queue
, struct imxdma_desc
,
594 list_move_tail(imxdmac
->ld_queue
.next
, &imxdmac
->ld_active
);
595 if (imxdma_xfer_desc(desc
) < 0)
596 dev_warn(imxdma
->dev
, "%s: channel: %d couldn't xfer desc\n",
597 __func__
, imxdmac
->channel
);
600 spin_unlock(&imxdma
->lock
);
603 static int imxdma_control(struct dma_chan
*chan
, enum dma_ctrl_cmd cmd
,
606 struct imxdma_channel
*imxdmac
= to_imxdma_chan(chan
);
607 struct dma_slave_config
*dmaengine_cfg
= (void *)arg
;
608 struct imxdma_engine
*imxdma
= imxdmac
->imxdma
;
610 unsigned int mode
= 0;
613 case DMA_TERMINATE_ALL
:
614 imxdma_disable_hw(imxdmac
);
616 spin_lock_irqsave(&imxdma
->lock
, flags
);
617 list_splice_tail_init(&imxdmac
->ld_active
, &imxdmac
->ld_free
);
618 list_splice_tail_init(&imxdmac
->ld_queue
, &imxdmac
->ld_free
);
619 spin_unlock_irqrestore(&imxdma
->lock
, flags
);
621 case DMA_SLAVE_CONFIG
:
622 if (dmaengine_cfg
->direction
== DMA_DEV_TO_MEM
) {
623 imxdmac
->per_address
= dmaengine_cfg
->src_addr
;
624 imxdmac
->watermark_level
= dmaengine_cfg
->src_maxburst
;
625 imxdmac
->word_size
= dmaengine_cfg
->src_addr_width
;
627 imxdmac
->per_address
= dmaengine_cfg
->dst_addr
;
628 imxdmac
->watermark_level
= dmaengine_cfg
->dst_maxburst
;
629 imxdmac
->word_size
= dmaengine_cfg
->dst_addr_width
;
632 switch (imxdmac
->word_size
) {
633 case DMA_SLAVE_BUSWIDTH_1_BYTE
:
634 mode
= IMX_DMA_MEMSIZE_8
;
636 case DMA_SLAVE_BUSWIDTH_2_BYTES
:
637 mode
= IMX_DMA_MEMSIZE_16
;
640 case DMA_SLAVE_BUSWIDTH_4_BYTES
:
641 mode
= IMX_DMA_MEMSIZE_32
;
645 imxdmac
->hw_chaining
= 1;
646 if (!imxdma_hw_chain(imxdmac
))
648 imxdmac
->ccr_from_device
= (mode
| IMX_DMA_TYPE_FIFO
) |
649 ((IMX_DMA_MEMSIZE_32
| IMX_DMA_TYPE_LINEAR
) << 2) |
651 imxdmac
->ccr_to_device
=
652 (IMX_DMA_MEMSIZE_32
| IMX_DMA_TYPE_LINEAR
) |
653 ((mode
| IMX_DMA_TYPE_FIFO
) << 2) | CCR_REN
;
654 imx_dmav1_writel(imxdma
, imxdmac
->dma_request
,
655 DMA_RSSR(imxdmac
->channel
));
657 /* Set burst length */
658 imx_dmav1_writel(imxdma
, imxdmac
->watermark_level
*
659 imxdmac
->word_size
, DMA_BLR(imxdmac
->channel
));
669 static enum dma_status
imxdma_tx_status(struct dma_chan
*chan
,
671 struct dma_tx_state
*txstate
)
673 return dma_cookie_status(chan
, cookie
, txstate
);
676 static dma_cookie_t
imxdma_tx_submit(struct dma_async_tx_descriptor
*tx
)
678 struct imxdma_channel
*imxdmac
= to_imxdma_chan(tx
->chan
);
679 struct imxdma_engine
*imxdma
= imxdmac
->imxdma
;
683 spin_lock_irqsave(&imxdma
->lock
, flags
);
684 list_move_tail(imxdmac
->ld_free
.next
, &imxdmac
->ld_queue
);
685 cookie
= dma_cookie_assign(tx
);
686 spin_unlock_irqrestore(&imxdma
->lock
, flags
);
691 static int imxdma_alloc_chan_resources(struct dma_chan
*chan
)
693 struct imxdma_channel
*imxdmac
= to_imxdma_chan(chan
);
694 struct imx_dma_data
*data
= chan
->private;
697 imxdmac
->dma_request
= data
->dma_request
;
699 while (imxdmac
->descs_allocated
< IMXDMA_MAX_CHAN_DESCRIPTORS
) {
700 struct imxdma_desc
*desc
;
702 desc
= kzalloc(sizeof(*desc
), GFP_KERNEL
);
705 __memzero(&desc
->desc
, sizeof(struct dma_async_tx_descriptor
));
706 dma_async_tx_descriptor_init(&desc
->desc
, chan
);
707 desc
->desc
.tx_submit
= imxdma_tx_submit
;
708 /* txd.flags will be overwritten in prep funcs */
709 desc
->desc
.flags
= DMA_CTRL_ACK
;
710 desc
->status
= DMA_SUCCESS
;
712 list_add_tail(&desc
->node
, &imxdmac
->ld_free
);
713 imxdmac
->descs_allocated
++;
716 if (!imxdmac
->descs_allocated
)
719 return imxdmac
->descs_allocated
;
722 static void imxdma_free_chan_resources(struct dma_chan
*chan
)
724 struct imxdma_channel
*imxdmac
= to_imxdma_chan(chan
);
725 struct imxdma_engine
*imxdma
= imxdmac
->imxdma
;
726 struct imxdma_desc
*desc
, *_desc
;
729 spin_lock_irqsave(&imxdma
->lock
, flags
);
731 imxdma_disable_hw(imxdmac
);
732 list_splice_tail_init(&imxdmac
->ld_active
, &imxdmac
->ld_free
);
733 list_splice_tail_init(&imxdmac
->ld_queue
, &imxdmac
->ld_free
);
735 spin_unlock_irqrestore(&imxdma
->lock
, flags
);
737 list_for_each_entry_safe(desc
, _desc
, &imxdmac
->ld_free
, node
) {
739 imxdmac
->descs_allocated
--;
741 INIT_LIST_HEAD(&imxdmac
->ld_free
);
743 if (imxdmac
->sg_list
) {
744 kfree(imxdmac
->sg_list
);
745 imxdmac
->sg_list
= NULL
;
749 static struct dma_async_tx_descriptor
*imxdma_prep_slave_sg(
750 struct dma_chan
*chan
, struct scatterlist
*sgl
,
751 unsigned int sg_len
, enum dma_transfer_direction direction
,
752 unsigned long flags
, void *context
)
754 struct imxdma_channel
*imxdmac
= to_imxdma_chan(chan
);
755 struct scatterlist
*sg
;
756 int i
, dma_length
= 0;
757 struct imxdma_desc
*desc
;
759 if (list_empty(&imxdmac
->ld_free
) ||
760 imxdma_chan_is_doing_cyclic(imxdmac
))
763 desc
= list_first_entry(&imxdmac
->ld_free
, struct imxdma_desc
, node
);
765 for_each_sg(sgl
, sg
, sg_len
, i
) {
766 dma_length
+= sg
->length
;
769 switch (imxdmac
->word_size
) {
770 case DMA_SLAVE_BUSWIDTH_4_BYTES
:
771 if (sgl
->length
& 3 || sgl
->dma_address
& 3)
774 case DMA_SLAVE_BUSWIDTH_2_BYTES
:
775 if (sgl
->length
& 1 || sgl
->dma_address
& 1)
778 case DMA_SLAVE_BUSWIDTH_1_BYTE
:
784 desc
->type
= IMXDMA_DESC_SLAVE_SG
;
786 desc
->sgcount
= sg_len
;
787 desc
->len
= dma_length
;
788 desc
->direction
= direction
;
789 if (direction
== DMA_DEV_TO_MEM
) {
790 desc
->src
= imxdmac
->per_address
;
792 desc
->dest
= imxdmac
->per_address
;
794 desc
->desc
.callback
= NULL
;
795 desc
->desc
.callback_param
= NULL
;
800 static struct dma_async_tx_descriptor
*imxdma_prep_dma_cyclic(
801 struct dma_chan
*chan
, dma_addr_t dma_addr
, size_t buf_len
,
802 size_t period_len
, enum dma_transfer_direction direction
,
805 struct imxdma_channel
*imxdmac
= to_imxdma_chan(chan
);
806 struct imxdma_engine
*imxdma
= imxdmac
->imxdma
;
807 struct imxdma_desc
*desc
;
809 unsigned int periods
= buf_len
/ period_len
;
811 dev_dbg(imxdma
->dev
, "%s channel: %d buf_len=%d period_len=%d\n",
812 __func__
, imxdmac
->channel
, buf_len
, period_len
);
814 if (list_empty(&imxdmac
->ld_free
) ||
815 imxdma_chan_is_doing_cyclic(imxdmac
))
818 desc
= list_first_entry(&imxdmac
->ld_free
, struct imxdma_desc
, node
);
820 if (imxdmac
->sg_list
)
821 kfree(imxdmac
->sg_list
);
823 imxdmac
->sg_list
= kcalloc(periods
+ 1,
824 sizeof(struct scatterlist
), GFP_KERNEL
);
825 if (!imxdmac
->sg_list
)
828 sg_init_table(imxdmac
->sg_list
, periods
);
830 for (i
= 0; i
< periods
; i
++) {
831 imxdmac
->sg_list
[i
].page_link
= 0;
832 imxdmac
->sg_list
[i
].offset
= 0;
833 imxdmac
->sg_list
[i
].dma_address
= dma_addr
;
834 imxdmac
->sg_list
[i
].length
= period_len
;
835 dma_addr
+= period_len
;
839 imxdmac
->sg_list
[periods
].offset
= 0;
840 imxdmac
->sg_list
[periods
].length
= 0;
841 imxdmac
->sg_list
[periods
].page_link
=
842 ((unsigned long)imxdmac
->sg_list
| 0x01) & ~0x02;
844 desc
->type
= IMXDMA_DESC_CYCLIC
;
845 desc
->sg
= imxdmac
->sg_list
;
846 desc
->sgcount
= periods
;
847 desc
->len
= IMX_DMA_LENGTH_LOOP
;
848 desc
->direction
= direction
;
849 if (direction
== DMA_DEV_TO_MEM
) {
850 desc
->src
= imxdmac
->per_address
;
852 desc
->dest
= imxdmac
->per_address
;
854 desc
->desc
.callback
= NULL
;
855 desc
->desc
.callback_param
= NULL
;
860 static struct dma_async_tx_descriptor
*imxdma_prep_dma_memcpy(
861 struct dma_chan
*chan
, dma_addr_t dest
,
862 dma_addr_t src
, size_t len
, unsigned long flags
)
864 struct imxdma_channel
*imxdmac
= to_imxdma_chan(chan
);
865 struct imxdma_engine
*imxdma
= imxdmac
->imxdma
;
866 struct imxdma_desc
*desc
;
868 dev_dbg(imxdma
->dev
, "%s channel: %d src=0x%x dst=0x%x len=%d\n",
869 __func__
, imxdmac
->channel
, src
, dest
, len
);
871 if (list_empty(&imxdmac
->ld_free
) ||
872 imxdma_chan_is_doing_cyclic(imxdmac
))
875 desc
= list_first_entry(&imxdmac
->ld_free
, struct imxdma_desc
, node
);
877 desc
->type
= IMXDMA_DESC_MEMCPY
;
881 desc
->direction
= DMA_MEM_TO_MEM
;
882 desc
->config_port
= IMX_DMA_MEMSIZE_32
| IMX_DMA_TYPE_LINEAR
;
883 desc
->config_mem
= IMX_DMA_MEMSIZE_32
| IMX_DMA_TYPE_LINEAR
;
884 desc
->desc
.callback
= NULL
;
885 desc
->desc
.callback_param
= NULL
;
890 static struct dma_async_tx_descriptor
*imxdma_prep_dma_interleaved(
891 struct dma_chan
*chan
, struct dma_interleaved_template
*xt
,
894 struct imxdma_channel
*imxdmac
= to_imxdma_chan(chan
);
895 struct imxdma_engine
*imxdma
= imxdmac
->imxdma
;
896 struct imxdma_desc
*desc
;
898 dev_dbg(imxdma
->dev
, "%s channel: %d src_start=0x%x dst_start=0x%x\n"
899 " src_sgl=%s dst_sgl=%s numf=%d frame_size=%d\n", __func__
,
900 imxdmac
->channel
, xt
->src_start
, xt
->dst_start
,
901 xt
->src_sgl
? "true" : "false", xt
->dst_sgl
? "true" : "false",
902 xt
->numf
, xt
->frame_size
);
904 if (list_empty(&imxdmac
->ld_free
) ||
905 imxdma_chan_is_doing_cyclic(imxdmac
))
908 if (xt
->frame_size
!= 1 || xt
->numf
<= 0 || xt
->dir
!= DMA_MEM_TO_MEM
)
911 desc
= list_first_entry(&imxdmac
->ld_free
, struct imxdma_desc
, node
);
913 desc
->type
= IMXDMA_DESC_INTERLEAVED
;
914 desc
->src
= xt
->src_start
;
915 desc
->dest
= xt
->dst_start
;
916 desc
->x
= xt
->sgl
[0].size
;
918 desc
->w
= xt
->sgl
[0].icg
+ desc
->x
;
919 desc
->len
= desc
->x
* desc
->y
;
920 desc
->direction
= DMA_MEM_TO_MEM
;
921 desc
->config_port
= IMX_DMA_MEMSIZE_32
;
922 desc
->config_mem
= IMX_DMA_MEMSIZE_32
;
924 desc
->config_mem
|= IMX_DMA_TYPE_2D
;
926 desc
->config_port
|= IMX_DMA_TYPE_2D
;
927 desc
->desc
.callback
= NULL
;
928 desc
->desc
.callback_param
= NULL
;
933 static void imxdma_issue_pending(struct dma_chan
*chan
)
935 struct imxdma_channel
*imxdmac
= to_imxdma_chan(chan
);
936 struct imxdma_engine
*imxdma
= imxdmac
->imxdma
;
937 struct imxdma_desc
*desc
;
940 spin_lock_irqsave(&imxdma
->lock
, flags
);
941 if (list_empty(&imxdmac
->ld_active
) &&
942 !list_empty(&imxdmac
->ld_queue
)) {
943 desc
= list_first_entry(&imxdmac
->ld_queue
,
944 struct imxdma_desc
, node
);
946 if (imxdma_xfer_desc(desc
) < 0) {
947 dev_warn(imxdma
->dev
,
948 "%s: channel: %d couldn't issue DMA xfer\n",
949 __func__
, imxdmac
->channel
);
951 list_move_tail(imxdmac
->ld_queue
.next
,
952 &imxdmac
->ld_active
);
955 spin_unlock_irqrestore(&imxdma
->lock
, flags
);
958 static int __init
imxdma_probe(struct platform_device
*pdev
)
960 struct imxdma_engine
*imxdma
;
964 imxdma
= kzalloc(sizeof(*imxdma
), GFP_KERNEL
);
969 imxdma
->base
= MX1_IO_ADDRESS(MX1_DMA_BASE_ADDR
);
970 } else if (cpu_is_mx21()) {
971 imxdma
->base
= MX21_IO_ADDRESS(MX21_DMA_BASE_ADDR
);
972 } else if (cpu_is_mx27()) {
973 imxdma
->base
= MX27_IO_ADDRESS(MX27_DMA_BASE_ADDR
);
979 imxdma
->dma_clk
= clk_get(NULL
, "dma");
980 if (IS_ERR(imxdma
->dma_clk
))
981 return PTR_ERR(imxdma
->dma_clk
);
982 clk_enable(imxdma
->dma_clk
);
984 /* reset DMA module */
985 imx_dmav1_writel(imxdma
, DCR_DRST
, DMA_DCR
);
988 ret
= request_irq(MX1_DMA_INT
, dma_irq_handler
, 0, "DMA", imxdma
);
990 dev_warn(imxdma
->dev
, "Can't register IRQ for DMA\n");
995 ret
= request_irq(MX1_DMA_ERR
, imxdma_err_handler
, 0, "DMA", imxdma
);
997 dev_warn(imxdma
->dev
, "Can't register ERRIRQ for DMA\n");
998 free_irq(MX1_DMA_INT
, NULL
);
1004 /* enable DMA module */
1005 imx_dmav1_writel(imxdma
, DCR_DEN
, DMA_DCR
);
1007 /* clear all interrupts */
1008 imx_dmav1_writel(imxdma
, (1 << IMX_DMA_CHANNELS
) - 1, DMA_DISR
);
1010 /* disable interrupts */
1011 imx_dmav1_writel(imxdma
, (1 << IMX_DMA_CHANNELS
) - 1, DMA_DIMR
);
1013 INIT_LIST_HEAD(&imxdma
->dma_device
.channels
);
1015 dma_cap_set(DMA_SLAVE
, imxdma
->dma_device
.cap_mask
);
1016 dma_cap_set(DMA_CYCLIC
, imxdma
->dma_device
.cap_mask
);
1017 dma_cap_set(DMA_MEMCPY
, imxdma
->dma_device
.cap_mask
);
1018 dma_cap_set(DMA_INTERLEAVE
, imxdma
->dma_device
.cap_mask
);
1020 /* Initialize 2D global parameters */
1021 for (i
= 0; i
< IMX_DMA_2D_SLOTS
; i
++)
1022 imxdma
->slots_2d
[i
].count
= 0;
1024 spin_lock_init(&imxdma
->lock
);
1026 /* Initialize channel parameters */
1027 for (i
= 0; i
< IMX_DMA_CHANNELS
; i
++) {
1028 struct imxdma_channel
*imxdmac
= &imxdma
->channel
[i
];
1030 if (cpu_is_mx21() || cpu_is_mx27()) {
1031 ret
= request_irq(MX2x_INT_DMACH0
+ i
,
1032 dma_irq_handler
, 0, "DMA", imxdma
);
1034 dev_warn(imxdma
->dev
, "Can't register IRQ %d "
1035 "for DMA channel %d\n",
1036 MX2x_INT_DMACH0
+ i
, i
);
1039 init_timer(&imxdmac
->watchdog
);
1040 imxdmac
->watchdog
.function
= &imxdma_watchdog
;
1041 imxdmac
->watchdog
.data
= (unsigned long)imxdmac
;
1044 imxdmac
->imxdma
= imxdma
;
1046 INIT_LIST_HEAD(&imxdmac
->ld_queue
);
1047 INIT_LIST_HEAD(&imxdmac
->ld_free
);
1048 INIT_LIST_HEAD(&imxdmac
->ld_active
);
1050 tasklet_init(&imxdmac
->dma_tasklet
, imxdma_tasklet
,
1051 (unsigned long)imxdmac
);
1052 imxdmac
->chan
.device
= &imxdma
->dma_device
;
1053 dma_cookie_init(&imxdmac
->chan
);
1054 imxdmac
->channel
= i
;
1056 /* Add the channel to the DMAC list */
1057 list_add_tail(&imxdmac
->chan
.device_node
,
1058 &imxdma
->dma_device
.channels
);
1061 imxdma
->dev
= &pdev
->dev
;
1062 imxdma
->dma_device
.dev
= &pdev
->dev
;
1064 imxdma
->dma_device
.device_alloc_chan_resources
= imxdma_alloc_chan_resources
;
1065 imxdma
->dma_device
.device_free_chan_resources
= imxdma_free_chan_resources
;
1066 imxdma
->dma_device
.device_tx_status
= imxdma_tx_status
;
1067 imxdma
->dma_device
.device_prep_slave_sg
= imxdma_prep_slave_sg
;
1068 imxdma
->dma_device
.device_prep_dma_cyclic
= imxdma_prep_dma_cyclic
;
1069 imxdma
->dma_device
.device_prep_dma_memcpy
= imxdma_prep_dma_memcpy
;
1070 imxdma
->dma_device
.device_prep_interleaved_dma
= imxdma_prep_dma_interleaved
;
1071 imxdma
->dma_device
.device_control
= imxdma_control
;
1072 imxdma
->dma_device
.device_issue_pending
= imxdma_issue_pending
;
1074 platform_set_drvdata(pdev
, imxdma
);
1076 imxdma
->dma_device
.copy_align
= 2; /* 2^2 = 4 bytes alignment */
1077 imxdma
->dma_device
.dev
->dma_parms
= &imxdma
->dma_parms
;
1078 dma_set_max_seg_size(imxdma
->dma_device
.dev
, 0xffffff);
1080 ret
= dma_async_device_register(&imxdma
->dma_device
);
1082 dev_err(&pdev
->dev
, "unable to register\n");
1090 if (cpu_is_mx21() || cpu_is_mx27()) {
1092 free_irq(MX2x_INT_DMACH0
+ i
, NULL
);
1093 } else if cpu_is_mx1() {
1094 free_irq(MX1_DMA_INT
, NULL
);
1095 free_irq(MX1_DMA_ERR
, NULL
);
1102 static int __exit
imxdma_remove(struct platform_device
*pdev
)
1104 struct imxdma_engine
*imxdma
= platform_get_drvdata(pdev
);
1107 dma_async_device_unregister(&imxdma
->dma_device
);
1109 if (cpu_is_mx21() || cpu_is_mx27()) {
1110 for (i
= 0; i
< IMX_DMA_CHANNELS
; i
++)
1111 free_irq(MX2x_INT_DMACH0
+ i
, NULL
);
1112 } else if cpu_is_mx1() {
1113 free_irq(MX1_DMA_INT
, NULL
);
1114 free_irq(MX1_DMA_ERR
, NULL
);
1122 static struct platform_driver imxdma_driver
= {
1126 .remove
= __exit_p(imxdma_remove
),
1129 static int __init
imxdma_module_init(void)
1131 return platform_driver_probe(&imxdma_driver
, imxdma_probe
);
1133 subsys_initcall(imxdma_module_init
);
1135 MODULE_AUTHOR("Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>");
1136 MODULE_DESCRIPTION("i.MX dma driver");
1137 MODULE_LICENSE("GPL");