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13#include <linux/clk.h>
14#include <linux/delay.h>
15#include <linux/dmaengine.h>
16#include <linux/dma-mapping.h>
17#include <linux/dmapool.h>
18#include <linux/err.h>
19#include <linux/init.h>
20#include <linux/iopoll.h>
21#include <linux/jiffies.h>
22#include <linux/list.h>
23#include <linux/log2.h>
24#include <linux/module.h>
25#include <linux/of.h>
26#include <linux/of_device.h>
27#include <linux/of_dma.h>
28#include <linux/platform_device.h>
29#include <linux/pm_runtime.h>
30#include <linux/reset.h>
31#include <linux/slab.h>
32
33#include "virt-dma.h"
34
35
36#define STM32_MDMA_SHIFT(n) (ffs(n) - 1)
37#define STM32_MDMA_SET(n, mask) (((n) << STM32_MDMA_SHIFT(mask)) & \
38 (mask))
39#define STM32_MDMA_GET(n, mask) (((n) & (mask)) >> \
40 STM32_MDMA_SHIFT(mask))
41
42#define STM32_MDMA_GISR0 0x0000
43#define STM32_MDMA_GISR1 0x0004
44
45
46#define STM32_MDMA_CISR(x) (0x40 + 0x40 * (x))
47#define STM32_MDMA_CISR_CRQA BIT(16)
48#define STM32_MDMA_CISR_TCIF BIT(4)
49#define STM32_MDMA_CISR_BTIF BIT(3)
50#define STM32_MDMA_CISR_BRTIF BIT(2)
51#define STM32_MDMA_CISR_CTCIF BIT(1)
52#define STM32_MDMA_CISR_TEIF BIT(0)
53
54
55#define STM32_MDMA_CIFCR(x) (0x44 + 0x40 * (x))
56#define STM32_MDMA_CIFCR_CLTCIF BIT(4)
57#define STM32_MDMA_CIFCR_CBTIF BIT(3)
58#define STM32_MDMA_CIFCR_CBRTIF BIT(2)
59#define STM32_MDMA_CIFCR_CCTCIF BIT(1)
60#define STM32_MDMA_CIFCR_CTEIF BIT(0)
61#define STM32_MDMA_CIFCR_CLEAR_ALL (STM32_MDMA_CIFCR_CLTCIF \
62 | STM32_MDMA_CIFCR_CBTIF \
63 | STM32_MDMA_CIFCR_CBRTIF \
64 | STM32_MDMA_CIFCR_CCTCIF \
65 | STM32_MDMA_CIFCR_CTEIF)
66
67
68#define STM32_MDMA_CESR(x) (0x48 + 0x40 * (x))
69#define STM32_MDMA_CESR_BSE BIT(11)
70#define STM32_MDMA_CESR_ASR BIT(10)
71#define STM32_MDMA_CESR_TEMD BIT(9)
72#define STM32_MDMA_CESR_TELD BIT(8)
73#define STM32_MDMA_CESR_TED BIT(7)
74#define STM32_MDMA_CESR_TEA_MASK GENMASK(6, 0)
75
76
77#define STM32_MDMA_CCR(x) (0x4C + 0x40 * (x))
78#define STM32_MDMA_CCR_SWRQ BIT(16)
79#define STM32_MDMA_CCR_WEX BIT(14)
80#define STM32_MDMA_CCR_HEX BIT(13)
81#define STM32_MDMA_CCR_BEX BIT(12)
82#define STM32_MDMA_CCR_PL_MASK GENMASK(7, 6)
83#define STM32_MDMA_CCR_PL(n) STM32_MDMA_SET(n, \
84 STM32_MDMA_CCR_PL_MASK)
85#define STM32_MDMA_CCR_TCIE BIT(5)
86#define STM32_MDMA_CCR_BTIE BIT(4)
87#define STM32_MDMA_CCR_BRTIE BIT(3)
88#define STM32_MDMA_CCR_CTCIE BIT(2)
89#define STM32_MDMA_CCR_TEIE BIT(1)
90#define STM32_MDMA_CCR_EN BIT(0)
91#define STM32_MDMA_CCR_IRQ_MASK (STM32_MDMA_CCR_TCIE \
92 | STM32_MDMA_CCR_BTIE \
93 | STM32_MDMA_CCR_BRTIE \
94 | STM32_MDMA_CCR_CTCIE \
95 | STM32_MDMA_CCR_TEIE)
96
97
98#define STM32_MDMA_CTCR(x) (0x50 + 0x40 * (x))
99#define STM32_MDMA_CTCR_BWM BIT(31)
100#define STM32_MDMA_CTCR_SWRM BIT(30)
101#define STM32_MDMA_CTCR_TRGM_MSK GENMASK(29, 28)
102#define STM32_MDMA_CTCR_TRGM(n) STM32_MDMA_SET((n), \
103 STM32_MDMA_CTCR_TRGM_MSK)
104#define STM32_MDMA_CTCR_TRGM_GET(n) STM32_MDMA_GET((n), \
105 STM32_MDMA_CTCR_TRGM_MSK)
106#define STM32_MDMA_CTCR_PAM_MASK GENMASK(27, 26)
107#define STM32_MDMA_CTCR_PAM(n) STM32_MDMA_SET(n, \
108 STM32_MDMA_CTCR_PAM_MASK)
109#define STM32_MDMA_CTCR_PKE BIT(25)
110#define STM32_MDMA_CTCR_TLEN_MSK GENMASK(24, 18)
111#define STM32_MDMA_CTCR_TLEN(n) STM32_MDMA_SET((n), \
112 STM32_MDMA_CTCR_TLEN_MSK)
113#define STM32_MDMA_CTCR_TLEN_GET(n) STM32_MDMA_GET((n), \
114 STM32_MDMA_CTCR_TLEN_MSK)
115#define STM32_MDMA_CTCR_LEN2_MSK GENMASK(25, 18)
116#define STM32_MDMA_CTCR_LEN2(n) STM32_MDMA_SET((n), \
117 STM32_MDMA_CTCR_LEN2_MSK)
118#define STM32_MDMA_CTCR_LEN2_GET(n) STM32_MDMA_GET((n), \
119 STM32_MDMA_CTCR_LEN2_MSK)
120#define STM32_MDMA_CTCR_DBURST_MASK GENMASK(17, 15)
121#define STM32_MDMA_CTCR_DBURST(n) STM32_MDMA_SET(n, \
122 STM32_MDMA_CTCR_DBURST_MASK)
123#define STM32_MDMA_CTCR_SBURST_MASK GENMASK(14, 12)
124#define STM32_MDMA_CTCR_SBURST(n) STM32_MDMA_SET(n, \
125 STM32_MDMA_CTCR_SBURST_MASK)
126#define STM32_MDMA_CTCR_DINCOS_MASK GENMASK(11, 10)
127#define STM32_MDMA_CTCR_DINCOS(n) STM32_MDMA_SET((n), \
128 STM32_MDMA_CTCR_DINCOS_MASK)
129#define STM32_MDMA_CTCR_SINCOS_MASK GENMASK(9, 8)
130#define STM32_MDMA_CTCR_SINCOS(n) STM32_MDMA_SET((n), \
131 STM32_MDMA_CTCR_SINCOS_MASK)
132#define STM32_MDMA_CTCR_DSIZE_MASK GENMASK(7, 6)
133#define STM32_MDMA_CTCR_DSIZE(n) STM32_MDMA_SET(n, \
134 STM32_MDMA_CTCR_DSIZE_MASK)
135#define STM32_MDMA_CTCR_SSIZE_MASK GENMASK(5, 4)
136#define STM32_MDMA_CTCR_SSIZE(n) STM32_MDMA_SET(n, \
137 STM32_MDMA_CTCR_SSIZE_MASK)
138#define STM32_MDMA_CTCR_DINC_MASK GENMASK(3, 2)
139#define STM32_MDMA_CTCR_DINC(n) STM32_MDMA_SET((n), \
140 STM32_MDMA_CTCR_DINC_MASK)
141#define STM32_MDMA_CTCR_SINC_MASK GENMASK(1, 0)
142#define STM32_MDMA_CTCR_SINC(n) STM32_MDMA_SET((n), \
143 STM32_MDMA_CTCR_SINC_MASK)
144#define STM32_MDMA_CTCR_CFG_MASK (STM32_MDMA_CTCR_SINC_MASK \
145 | STM32_MDMA_CTCR_DINC_MASK \
146 | STM32_MDMA_CTCR_SINCOS_MASK \
147 | STM32_MDMA_CTCR_DINCOS_MASK \
148 | STM32_MDMA_CTCR_LEN2_MSK \
149 | STM32_MDMA_CTCR_TRGM_MSK)
150
151
152#define STM32_MDMA_CBNDTR(x) (0x54 + 0x40 * (x))
153#define STM32_MDMA_CBNDTR_BRC_MK GENMASK(31, 20)
154#define STM32_MDMA_CBNDTR_BRC(n) STM32_MDMA_SET(n, \
155 STM32_MDMA_CBNDTR_BRC_MK)
156#define STM32_MDMA_CBNDTR_BRC_GET(n) STM32_MDMA_GET((n), \
157 STM32_MDMA_CBNDTR_BRC_MK)
158
159#define STM32_MDMA_CBNDTR_BRDUM BIT(19)
160#define STM32_MDMA_CBNDTR_BRSUM BIT(18)
161#define STM32_MDMA_CBNDTR_BNDT_MASK GENMASK(16, 0)
162#define STM32_MDMA_CBNDTR_BNDT(n) STM32_MDMA_SET(n, \
163 STM32_MDMA_CBNDTR_BNDT_MASK)
164
165
166#define STM32_MDMA_CSAR(x) (0x58 + 0x40 * (x))
167
168
169#define STM32_MDMA_CDAR(x) (0x5C + 0x40 * (x))
170
171
172#define STM32_MDMA_CBRUR(x) (0x60 + 0x40 * (x))
173#define STM32_MDMA_CBRUR_DUV_MASK GENMASK(31, 16)
174#define STM32_MDMA_CBRUR_DUV(n) STM32_MDMA_SET(n, \
175 STM32_MDMA_CBRUR_DUV_MASK)
176#define STM32_MDMA_CBRUR_SUV_MASK GENMASK(15, 0)
177#define STM32_MDMA_CBRUR_SUV(n) STM32_MDMA_SET(n, \
178 STM32_MDMA_CBRUR_SUV_MASK)
179
180
181#define STM32_MDMA_CLAR(x) (0x64 + 0x40 * (x))
182
183
184#define STM32_MDMA_CTBR(x) (0x68 + 0x40 * (x))
185#define STM32_MDMA_CTBR_DBUS BIT(17)
186#define STM32_MDMA_CTBR_SBUS BIT(16)
187#define STM32_MDMA_CTBR_TSEL_MASK GENMASK(7, 0)
188#define STM32_MDMA_CTBR_TSEL(n) STM32_MDMA_SET(n, \
189 STM32_MDMA_CTBR_TSEL_MASK)
190
191
192#define STM32_MDMA_CMAR(x) (0x70 + 0x40 * (x))
193
194
195#define STM32_MDMA_CMDR(x) (0x74 + 0x40 * (x))
196
197#define STM32_MDMA_MAX_BUF_LEN 128
198#define STM32_MDMA_MAX_BLOCK_LEN 65536
199#define STM32_MDMA_MAX_CHANNELS 63
200#define STM32_MDMA_MAX_REQUESTS 256
201#define STM32_MDMA_MAX_BURST 128
202#define STM32_MDMA_VERY_HIGH_PRIORITY 0x11
203
204enum stm32_mdma_trigger_mode {
205 STM32_MDMA_BUFFER,
206 STM32_MDMA_BLOCK,
207 STM32_MDMA_BLOCK_REP,
208 STM32_MDMA_LINKED_LIST,
209};
210
211enum stm32_mdma_width {
212 STM32_MDMA_BYTE,
213 STM32_MDMA_HALF_WORD,
214 STM32_MDMA_WORD,
215 STM32_MDMA_DOUBLE_WORD,
216};
217
218enum stm32_mdma_inc_mode {
219 STM32_MDMA_FIXED = 0,
220 STM32_MDMA_INC = 2,
221 STM32_MDMA_DEC = 3,
222};
223
224struct stm32_mdma_chan_config {
225 u32 request;
226 u32 priority_level;
227 u32 transfer_config;
228 u32 mask_addr;
229 u32 mask_data;
230};
231
232struct stm32_mdma_hwdesc {
233 u32 ctcr;
234 u32 cbndtr;
235 u32 csar;
236 u32 cdar;
237 u32 cbrur;
238 u32 clar;
239 u32 ctbr;
240 u32 dummy;
241 u32 cmar;
242 u32 cmdr;
243} __aligned(64);
244
245struct stm32_mdma_desc_node {
246 struct stm32_mdma_hwdesc *hwdesc;
247 dma_addr_t hwdesc_phys;
248};
249
250struct stm32_mdma_desc {
251 struct virt_dma_desc vdesc;
252 u32 ccr;
253 bool cyclic;
254 u32 count;
255 struct stm32_mdma_desc_node node[];
256};
257
258struct stm32_mdma_chan {
259 struct virt_dma_chan vchan;
260 struct dma_pool *desc_pool;
261 u32 id;
262 struct stm32_mdma_desc *desc;
263 u32 curr_hwdesc;
264 struct dma_slave_config dma_config;
265 struct stm32_mdma_chan_config chan_config;
266 bool busy;
267 u32 mem_burst;
268 u32 mem_width;
269};
270
271struct stm32_mdma_device {
272 struct dma_device ddev;
273 void __iomem *base;
274 struct clk *clk;
275 int irq;
276 u32 nr_channels;
277 u32 nr_requests;
278 u32 nr_ahb_addr_masks;
279 struct stm32_mdma_chan chan[STM32_MDMA_MAX_CHANNELS];
280 u32 ahb_addr_masks[];
281};
282
283static struct stm32_mdma_device *stm32_mdma_get_dev(
284 struct stm32_mdma_chan *chan)
285{
286 return container_of(chan->vchan.chan.device, struct stm32_mdma_device,
287 ddev);
288}
289
290static struct stm32_mdma_chan *to_stm32_mdma_chan(struct dma_chan *c)
291{
292 return container_of(c, struct stm32_mdma_chan, vchan.chan);
293}
294
295static struct stm32_mdma_desc *to_stm32_mdma_desc(struct virt_dma_desc *vdesc)
296{
297 return container_of(vdesc, struct stm32_mdma_desc, vdesc);
298}
299
300static struct device *chan2dev(struct stm32_mdma_chan *chan)
301{
302 return &chan->vchan.chan.dev->device;
303}
304
305static struct device *mdma2dev(struct stm32_mdma_device *mdma_dev)
306{
307 return mdma_dev->ddev.dev;
308}
309
310static u32 stm32_mdma_read(struct stm32_mdma_device *dmadev, u32 reg)
311{
312 return readl_relaxed(dmadev->base + reg);
313}
314
315static void stm32_mdma_write(struct stm32_mdma_device *dmadev, u32 reg, u32 val)
316{
317 writel_relaxed(val, dmadev->base + reg);
318}
319
320static void stm32_mdma_set_bits(struct stm32_mdma_device *dmadev, u32 reg,
321 u32 mask)
322{
323 void __iomem *addr = dmadev->base + reg;
324
325 writel_relaxed(readl_relaxed(addr) | mask, addr);
326}
327
328static void stm32_mdma_clr_bits(struct stm32_mdma_device *dmadev, u32 reg,
329 u32 mask)
330{
331 void __iomem *addr = dmadev->base + reg;
332
333 writel_relaxed(readl_relaxed(addr) & ~mask, addr);
334}
335
336static struct stm32_mdma_desc *stm32_mdma_alloc_desc(
337 struct stm32_mdma_chan *chan, u32 count)
338{
339 struct stm32_mdma_desc *desc;
340 int i;
341
342 desc = kzalloc(offsetof(typeof(*desc), node[count]), GFP_NOWAIT);
343 if (!desc)
344 return NULL;
345
346 for (i = 0; i < count; i++) {
347 desc->node[i].hwdesc =
348 dma_pool_alloc(chan->desc_pool, GFP_NOWAIT,
349 &desc->node[i].hwdesc_phys);
350 if (!desc->node[i].hwdesc)
351 goto err;
352 }
353
354 desc->count = count;
355
356 return desc;
357
358err:
359 dev_err(chan2dev(chan), "Failed to allocate descriptor\n");
360 while (--i >= 0)
361 dma_pool_free(chan->desc_pool, desc->node[i].hwdesc,
362 desc->node[i].hwdesc_phys);
363 kfree(desc);
364 return NULL;
365}
366
367static void stm32_mdma_desc_free(struct virt_dma_desc *vdesc)
368{
369 struct stm32_mdma_desc *desc = to_stm32_mdma_desc(vdesc);
370 struct stm32_mdma_chan *chan = to_stm32_mdma_chan(vdesc->tx.chan);
371 int i;
372
373 for (i = 0; i < desc->count; i++)
374 dma_pool_free(chan->desc_pool, desc->node[i].hwdesc,
375 desc->node[i].hwdesc_phys);
376 kfree(desc);
377}
378
379static int stm32_mdma_get_width(struct stm32_mdma_chan *chan,
380 enum dma_slave_buswidth width)
381{
382 switch (width) {
383 case DMA_SLAVE_BUSWIDTH_1_BYTE:
384 case DMA_SLAVE_BUSWIDTH_2_BYTES:
385 case DMA_SLAVE_BUSWIDTH_4_BYTES:
386 case DMA_SLAVE_BUSWIDTH_8_BYTES:
387 return ffs(width) - 1;
388 default:
389 dev_err(chan2dev(chan), "Dma bus width %i not supported\n",
390 width);
391 return -EINVAL;
392 }
393}
394
395static enum dma_slave_buswidth stm32_mdma_get_max_width(dma_addr_t addr,
396 u32 buf_len, u32 tlen)
397{
398 enum dma_slave_buswidth max_width = DMA_SLAVE_BUSWIDTH_8_BYTES;
399
400 for (max_width = DMA_SLAVE_BUSWIDTH_8_BYTES;
401 max_width > DMA_SLAVE_BUSWIDTH_1_BYTE;
402 max_width >>= 1) {
403
404
405
406
407 if ((((buf_len | addr) & (max_width - 1)) == 0) &&
408 tlen >= max_width)
409 break;
410 }
411
412 return max_width;
413}
414
415static u32 stm32_mdma_get_best_burst(u32 buf_len, u32 tlen, u32 max_burst,
416 enum dma_slave_buswidth width)
417{
418 u32 best_burst;
419
420 best_burst = min((u32)1 << __ffs(tlen | buf_len),
421 max_burst * width) / width;
422
423 return (best_burst > 0) ? best_burst : 1;
424}
425
426static int stm32_mdma_disable_chan(struct stm32_mdma_chan *chan)
427{
428 struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
429 u32 ccr, cisr, id, reg;
430 int ret;
431
432 id = chan->id;
433 reg = STM32_MDMA_CCR(id);
434
435
436 stm32_mdma_clr_bits(dmadev, reg, STM32_MDMA_CCR_IRQ_MASK);
437
438 ccr = stm32_mdma_read(dmadev, reg);
439 if (ccr & STM32_MDMA_CCR_EN) {
440 stm32_mdma_clr_bits(dmadev, reg, STM32_MDMA_CCR_EN);
441
442
443 ret = readl_relaxed_poll_timeout_atomic(
444 dmadev->base + STM32_MDMA_CISR(id), cisr,
445 (cisr & STM32_MDMA_CISR_CTCIF), 10, 1000);
446 if (ret) {
447 dev_err(chan2dev(chan), "%s: timeout!\n", __func__);
448 return -EBUSY;
449 }
450 }
451
452 return 0;
453}
454
455static void stm32_mdma_stop(struct stm32_mdma_chan *chan)
456{
457 struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
458 u32 status;
459 int ret;
460
461
462 ret = stm32_mdma_disable_chan(chan);
463 if (ret < 0)
464 return;
465
466
467 status = stm32_mdma_read(dmadev, STM32_MDMA_CISR(chan->id));
468 if (status) {
469 dev_dbg(chan2dev(chan), "%s(): clearing interrupt: 0x%08x\n",
470 __func__, status);
471 stm32_mdma_set_bits(dmadev, STM32_MDMA_CIFCR(chan->id), status);
472 }
473
474 chan->busy = false;
475}
476
477static void stm32_mdma_set_bus(struct stm32_mdma_device *dmadev, u32 *ctbr,
478 u32 ctbr_mask, u32 src_addr)
479{
480 u32 mask;
481 int i;
482
483
484 *ctbr &= ~ctbr_mask;
485 mask = src_addr & 0xF0000000;
486 for (i = 0; i < dmadev->nr_ahb_addr_masks; i++) {
487 if (mask == dmadev->ahb_addr_masks[i]) {
488 *ctbr |= ctbr_mask;
489 break;
490 }
491 }
492}
493
494static int stm32_mdma_set_xfer_param(struct stm32_mdma_chan *chan,
495 enum dma_transfer_direction direction,
496 u32 *mdma_ccr, u32 *mdma_ctcr,
497 u32 *mdma_ctbr, dma_addr_t addr,
498 u32 buf_len)
499{
500 struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
501 struct stm32_mdma_chan_config *chan_config = &chan->chan_config;
502 enum dma_slave_buswidth src_addr_width, dst_addr_width;
503 phys_addr_t src_addr, dst_addr;
504 int src_bus_width, dst_bus_width;
505 u32 src_maxburst, dst_maxburst, src_best_burst, dst_best_burst;
506 u32 ccr, ctcr, ctbr, tlen;
507
508 src_addr_width = chan->dma_config.src_addr_width;
509 dst_addr_width = chan->dma_config.dst_addr_width;
510 src_maxburst = chan->dma_config.src_maxburst;
511 dst_maxburst = chan->dma_config.dst_maxburst;
512
513 ccr = stm32_mdma_read(dmadev, STM32_MDMA_CCR(chan->id));
514 ctcr = stm32_mdma_read(dmadev, STM32_MDMA_CTCR(chan->id));
515 ctbr = stm32_mdma_read(dmadev, STM32_MDMA_CTBR(chan->id));
516
517
518 ctcr &= ~STM32_MDMA_CTCR_SWRM;
519
520
521 ctcr &= ~STM32_MDMA_CTCR_CFG_MASK;
522 ctcr |= chan_config->transfer_config & STM32_MDMA_CTCR_CFG_MASK;
523
524
525
526
527
528 tlen = STM32_MDMA_CTCR_LEN2_GET(ctcr);
529 ctcr &= ~STM32_MDMA_CTCR_LEN2_MSK;
530 ctcr |= STM32_MDMA_CTCR_TLEN((tlen - 1));
531
532
533 ctcr &= ~STM32_MDMA_CTCR_PKE;
534
535
536 if (src_maxburst * src_addr_width > STM32_MDMA_MAX_BURST ||
537 dst_maxburst * dst_addr_width > STM32_MDMA_MAX_BURST) {
538 dev_err(chan2dev(chan),
539 "burst size * bus width higher than %d bytes\n",
540 STM32_MDMA_MAX_BURST);
541 return -EINVAL;
542 }
543
544 if ((!is_power_of_2(src_maxburst) && src_maxburst > 0) ||
545 (!is_power_of_2(dst_maxburst) && dst_maxburst > 0)) {
546 dev_err(chan2dev(chan), "burst size must be a power of 2\n");
547 return -EINVAL;
548 }
549
550
551
552
553
554
555
556 ccr &= ~(STM32_MDMA_CCR_SWRQ | STM32_MDMA_CCR_WEX | STM32_MDMA_CCR_HEX |
557 STM32_MDMA_CCR_BEX | STM32_MDMA_CCR_PL_MASK);
558 ccr |= STM32_MDMA_CCR_PL(chan_config->priority_level);
559
560
561 ctbr &= ~STM32_MDMA_CTBR_TSEL_MASK;
562 ctbr |= STM32_MDMA_CTBR_TSEL(chan_config->request);
563
564 switch (direction) {
565 case DMA_MEM_TO_DEV:
566 dst_addr = chan->dma_config.dst_addr;
567
568
569 dst_bus_width = stm32_mdma_get_width(chan, dst_addr_width);
570 if (dst_bus_width < 0)
571 return dst_bus_width;
572 ctcr &= ~STM32_MDMA_CTCR_DSIZE_MASK;
573 ctcr |= STM32_MDMA_CTCR_DSIZE(dst_bus_width);
574
575
576 dst_best_burst = stm32_mdma_get_best_burst(buf_len, tlen,
577 dst_maxburst,
578 dst_addr_width);
579 chan->mem_burst = dst_best_burst;
580 ctcr &= ~STM32_MDMA_CTCR_DBURST_MASK;
581 ctcr |= STM32_MDMA_CTCR_DBURST((ilog2(dst_best_burst)));
582
583
584 src_addr_width = stm32_mdma_get_max_width(addr, buf_len, tlen);
585 chan->mem_width = src_addr_width;
586 src_bus_width = stm32_mdma_get_width(chan, src_addr_width);
587 if (src_bus_width < 0)
588 return src_bus_width;
589 ctcr &= ~STM32_MDMA_CTCR_SSIZE_MASK |
590 STM32_MDMA_CTCR_SINCOS_MASK;
591 ctcr |= STM32_MDMA_CTCR_SSIZE(src_bus_width) |
592 STM32_MDMA_CTCR_SINCOS(src_bus_width);
593
594
595 src_maxburst = STM32_MDMA_MAX_BUF_LEN / src_addr_width;
596 src_best_burst = stm32_mdma_get_best_burst(buf_len, tlen,
597 src_maxburst,
598 src_addr_width);
599 chan->mem_burst = src_best_burst;
600 ctcr &= ~STM32_MDMA_CTCR_SBURST_MASK;
601 ctcr |= STM32_MDMA_CTCR_SBURST((ilog2(src_best_burst)));
602
603
604 stm32_mdma_set_bus(dmadev, &ctbr, STM32_MDMA_CTBR_DBUS,
605 dst_addr);
606
607 if (dst_bus_width != src_bus_width)
608 ctcr |= STM32_MDMA_CTCR_PKE;
609
610
611 stm32_mdma_write(dmadev, STM32_MDMA_CDAR(chan->id), dst_addr);
612 break;
613
614 case DMA_DEV_TO_MEM:
615 src_addr = chan->dma_config.src_addr;
616
617
618 src_bus_width = stm32_mdma_get_width(chan, src_addr_width);
619 if (src_bus_width < 0)
620 return src_bus_width;
621 ctcr &= ~STM32_MDMA_CTCR_SSIZE_MASK;
622 ctcr |= STM32_MDMA_CTCR_SSIZE(src_bus_width);
623
624
625 src_best_burst = stm32_mdma_get_best_burst(buf_len, tlen,
626 src_maxburst,
627 src_addr_width);
628 ctcr &= ~STM32_MDMA_CTCR_SBURST_MASK;
629 ctcr |= STM32_MDMA_CTCR_SBURST((ilog2(src_best_burst)));
630
631
632 dst_addr_width = stm32_mdma_get_max_width(addr, buf_len, tlen);
633 chan->mem_width = dst_addr_width;
634 dst_bus_width = stm32_mdma_get_width(chan, dst_addr_width);
635 if (dst_bus_width < 0)
636 return dst_bus_width;
637 ctcr &= ~(STM32_MDMA_CTCR_DSIZE_MASK |
638 STM32_MDMA_CTCR_DINCOS_MASK);
639 ctcr |= STM32_MDMA_CTCR_DSIZE(dst_bus_width) |
640 STM32_MDMA_CTCR_DINCOS(dst_bus_width);
641
642
643 dst_maxburst = STM32_MDMA_MAX_BUF_LEN / dst_addr_width;
644 dst_best_burst = stm32_mdma_get_best_burst(buf_len, tlen,
645 dst_maxburst,
646 dst_addr_width);
647 ctcr &= ~STM32_MDMA_CTCR_DBURST_MASK;
648 ctcr |= STM32_MDMA_CTCR_DBURST((ilog2(dst_best_burst)));
649
650
651 stm32_mdma_set_bus(dmadev, &ctbr, STM32_MDMA_CTBR_SBUS,
652 src_addr);
653
654 if (dst_bus_width != src_bus_width)
655 ctcr |= STM32_MDMA_CTCR_PKE;
656
657
658 stm32_mdma_write(dmadev, STM32_MDMA_CSAR(chan->id), src_addr);
659 break;
660
661 default:
662 dev_err(chan2dev(chan), "Dma direction is not supported\n");
663 return -EINVAL;
664 }
665
666 *mdma_ccr = ccr;
667 *mdma_ctcr = ctcr;
668 *mdma_ctbr = ctbr;
669
670 return 0;
671}
672
673static void stm32_mdma_dump_hwdesc(struct stm32_mdma_chan *chan,
674 struct stm32_mdma_desc_node *node)
675{
676 dev_dbg(chan2dev(chan), "hwdesc: %pad\n", &node->hwdesc_phys);
677 dev_dbg(chan2dev(chan), "CTCR: 0x%08x\n", node->hwdesc->ctcr);
678 dev_dbg(chan2dev(chan), "CBNDTR: 0x%08x\n", node->hwdesc->cbndtr);
679 dev_dbg(chan2dev(chan), "CSAR: 0x%08x\n", node->hwdesc->csar);
680 dev_dbg(chan2dev(chan), "CDAR: 0x%08x\n", node->hwdesc->cdar);
681 dev_dbg(chan2dev(chan), "CBRUR: 0x%08x\n", node->hwdesc->cbrur);
682 dev_dbg(chan2dev(chan), "CLAR: 0x%08x\n", node->hwdesc->clar);
683 dev_dbg(chan2dev(chan), "CTBR: 0x%08x\n", node->hwdesc->ctbr);
684 dev_dbg(chan2dev(chan), "CMAR: 0x%08x\n", node->hwdesc->cmar);
685 dev_dbg(chan2dev(chan), "CMDR: 0x%08x\n\n", node->hwdesc->cmdr);
686}
687
688static void stm32_mdma_setup_hwdesc(struct stm32_mdma_chan *chan,
689 struct stm32_mdma_desc *desc,
690 enum dma_transfer_direction dir, u32 count,
691 dma_addr_t src_addr, dma_addr_t dst_addr,
692 u32 len, u32 ctcr, u32 ctbr, bool is_last,
693 bool is_first, bool is_cyclic)
694{
695 struct stm32_mdma_chan_config *config = &chan->chan_config;
696 struct stm32_mdma_hwdesc *hwdesc;
697 u32 next = count + 1;
698
699 hwdesc = desc->node[count].hwdesc;
700 hwdesc->ctcr = ctcr;
701 hwdesc->cbndtr &= ~(STM32_MDMA_CBNDTR_BRC_MK |
702 STM32_MDMA_CBNDTR_BRDUM |
703 STM32_MDMA_CBNDTR_BRSUM |
704 STM32_MDMA_CBNDTR_BNDT_MASK);
705 hwdesc->cbndtr |= STM32_MDMA_CBNDTR_BNDT(len);
706 hwdesc->csar = src_addr;
707 hwdesc->cdar = dst_addr;
708 hwdesc->cbrur = 0;
709 hwdesc->ctbr = ctbr;
710 hwdesc->cmar = config->mask_addr;
711 hwdesc->cmdr = config->mask_data;
712
713 if (is_last) {
714 if (is_cyclic)
715 hwdesc->clar = desc->node[0].hwdesc_phys;
716 else
717 hwdesc->clar = 0;
718 } else {
719 hwdesc->clar = desc->node[next].hwdesc_phys;
720 }
721
722 stm32_mdma_dump_hwdesc(chan, &desc->node[count]);
723}
724
725static int stm32_mdma_setup_xfer(struct stm32_mdma_chan *chan,
726 struct stm32_mdma_desc *desc,
727 struct scatterlist *sgl, u32 sg_len,
728 enum dma_transfer_direction direction)
729{
730 struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
731 struct dma_slave_config *dma_config = &chan->dma_config;
732 struct scatterlist *sg;
733 dma_addr_t src_addr, dst_addr;
734 u32 ccr, ctcr, ctbr;
735 int i, ret = 0;
736
737 for_each_sg(sgl, sg, sg_len, i) {
738 if (sg_dma_len(sg) > STM32_MDMA_MAX_BLOCK_LEN) {
739 dev_err(chan2dev(chan), "Invalid block len\n");
740 return -EINVAL;
741 }
742
743 if (direction == DMA_MEM_TO_DEV) {
744 src_addr = sg_dma_address(sg);
745 dst_addr = dma_config->dst_addr;
746 ret = stm32_mdma_set_xfer_param(chan, direction, &ccr,
747 &ctcr, &ctbr, src_addr,
748 sg_dma_len(sg));
749 stm32_mdma_set_bus(dmadev, &ctbr, STM32_MDMA_CTBR_SBUS,
750 src_addr);
751 } else {
752 src_addr = dma_config->src_addr;
753 dst_addr = sg_dma_address(sg);
754 ret = stm32_mdma_set_xfer_param(chan, direction, &ccr,
755 &ctcr, &ctbr, dst_addr,
756 sg_dma_len(sg));
757 stm32_mdma_set_bus(dmadev, &ctbr, STM32_MDMA_CTBR_DBUS,
758 dst_addr);
759 }
760
761 if (ret < 0)
762 return ret;
763
764 stm32_mdma_setup_hwdesc(chan, desc, direction, i, src_addr,
765 dst_addr, sg_dma_len(sg), ctcr, ctbr,
766 i == sg_len - 1, i == 0, false);
767 }
768
769
770 ccr &= ~STM32_MDMA_CCR_IRQ_MASK;
771 ccr |= STM32_MDMA_CCR_TEIE | STM32_MDMA_CCR_CTCIE;
772 if (sg_len > 1)
773 ccr |= STM32_MDMA_CCR_BTIE;
774 desc->ccr = ccr;
775
776 return 0;
777}
778
779static struct dma_async_tx_descriptor *
780stm32_mdma_prep_slave_sg(struct dma_chan *c, struct scatterlist *sgl,
781 u32 sg_len, enum dma_transfer_direction direction,
782 unsigned long flags, void *context)
783{
784 struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
785 struct stm32_mdma_desc *desc;
786 int i, ret;
787
788
789
790
791
792
793 if (chan->desc && chan->desc->cyclic) {
794 dev_err(chan2dev(chan),
795 "Request not allowed when dma in cyclic mode\n");
796 return NULL;
797 }
798
799 desc = stm32_mdma_alloc_desc(chan, sg_len);
800 if (!desc)
801 return NULL;
802
803 ret = stm32_mdma_setup_xfer(chan, desc, sgl, sg_len, direction);
804 if (ret < 0)
805 goto xfer_setup_err;
806
807 desc->cyclic = false;
808
809 return vchan_tx_prep(&chan->vchan, &desc->vdesc, flags);
810
811xfer_setup_err:
812 for (i = 0; i < desc->count; i++)
813 dma_pool_free(chan->desc_pool, desc->node[i].hwdesc,
814 desc->node[i].hwdesc_phys);
815 kfree(desc);
816 return NULL;
817}
818
819static struct dma_async_tx_descriptor *
820stm32_mdma_prep_dma_cyclic(struct dma_chan *c, dma_addr_t buf_addr,
821 size_t buf_len, size_t period_len,
822 enum dma_transfer_direction direction,
823 unsigned long flags)
824{
825 struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
826 struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
827 struct dma_slave_config *dma_config = &chan->dma_config;
828 struct stm32_mdma_desc *desc;
829 dma_addr_t src_addr, dst_addr;
830 u32 ccr, ctcr, ctbr, count;
831 int i, ret;
832
833
834
835
836
837
838 if (chan->desc && chan->desc->cyclic) {
839 dev_err(chan2dev(chan),
840 "Request not allowed when dma in cyclic mode\n");
841 return NULL;
842 }
843
844 if (!buf_len || !period_len || period_len > STM32_MDMA_MAX_BLOCK_LEN) {
845 dev_err(chan2dev(chan), "Invalid buffer/period len\n");
846 return NULL;
847 }
848
849 if (buf_len % period_len) {
850 dev_err(chan2dev(chan), "buf_len not multiple of period_len\n");
851 return NULL;
852 }
853
854 count = buf_len / period_len;
855
856 desc = stm32_mdma_alloc_desc(chan, count);
857 if (!desc)
858 return NULL;
859
860
861 if (direction == DMA_MEM_TO_DEV) {
862 src_addr = buf_addr;
863 ret = stm32_mdma_set_xfer_param(chan, direction, &ccr, &ctcr,
864 &ctbr, src_addr, period_len);
865 stm32_mdma_set_bus(dmadev, &ctbr, STM32_MDMA_CTBR_SBUS,
866 src_addr);
867 } else {
868 dst_addr = buf_addr;
869 ret = stm32_mdma_set_xfer_param(chan, direction, &ccr, &ctcr,
870 &ctbr, dst_addr, period_len);
871 stm32_mdma_set_bus(dmadev, &ctbr, STM32_MDMA_CTBR_DBUS,
872 dst_addr);
873 }
874
875 if (ret < 0)
876 goto xfer_setup_err;
877
878
879 ccr &= ~STM32_MDMA_CCR_IRQ_MASK;
880 ccr |= STM32_MDMA_CCR_TEIE | STM32_MDMA_CCR_CTCIE | STM32_MDMA_CCR_BTIE;
881 desc->ccr = ccr;
882
883
884 for (i = 0; i < count; i++) {
885 if (direction == DMA_MEM_TO_DEV) {
886 src_addr = buf_addr + i * period_len;
887 dst_addr = dma_config->dst_addr;
888 } else {
889 src_addr = dma_config->src_addr;
890 dst_addr = buf_addr + i * period_len;
891 }
892
893 stm32_mdma_setup_hwdesc(chan, desc, direction, i, src_addr,
894 dst_addr, period_len, ctcr, ctbr,
895 i == count - 1, i == 0, true);
896 }
897
898 desc->cyclic = true;
899
900 return vchan_tx_prep(&chan->vchan, &desc->vdesc, flags);
901
902xfer_setup_err:
903 for (i = 0; i < desc->count; i++)
904 dma_pool_free(chan->desc_pool, desc->node[i].hwdesc,
905 desc->node[i].hwdesc_phys);
906 kfree(desc);
907 return NULL;
908}
909
910static struct dma_async_tx_descriptor *
911stm32_mdma_prep_dma_memcpy(struct dma_chan *c, dma_addr_t dest, dma_addr_t src,
912 size_t len, unsigned long flags)
913{
914 struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
915 struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
916 enum dma_slave_buswidth max_width;
917 struct stm32_mdma_desc *desc;
918 struct stm32_mdma_hwdesc *hwdesc;
919 u32 ccr, ctcr, ctbr, cbndtr, count, max_burst, mdma_burst;
920 u32 best_burst, tlen;
921 size_t xfer_count, offset;
922 int src_bus_width, dst_bus_width;
923 int i;
924
925
926
927
928
929
930 if (chan->desc && chan->desc->cyclic) {
931 dev_err(chan2dev(chan),
932 "Request not allowed when dma in cyclic mode\n");
933 return NULL;
934 }
935
936 count = DIV_ROUND_UP(len, STM32_MDMA_MAX_BLOCK_LEN);
937 desc = stm32_mdma_alloc_desc(chan, count);
938 if (!desc)
939 return NULL;
940
941 ccr = stm32_mdma_read(dmadev, STM32_MDMA_CCR(chan->id));
942 ctcr = stm32_mdma_read(dmadev, STM32_MDMA_CTCR(chan->id));
943 ctbr = stm32_mdma_read(dmadev, STM32_MDMA_CTBR(chan->id));
944 cbndtr = stm32_mdma_read(dmadev, STM32_MDMA_CBNDTR(chan->id));
945
946
947 ccr &= ~(STM32_MDMA_CCR_WEX | STM32_MDMA_CCR_HEX |
948 STM32_MDMA_CCR_BEX | STM32_MDMA_CCR_PL_MASK |
949 STM32_MDMA_CCR_IRQ_MASK);
950 ccr |= STM32_MDMA_CCR_TEIE;
951
952
953 ctcr &= ~(STM32_MDMA_CTCR_BWM | STM32_MDMA_CTCR_TRGM_MSK |
954 STM32_MDMA_CTCR_PAM_MASK | STM32_MDMA_CTCR_PKE |
955 STM32_MDMA_CTCR_TLEN_MSK | STM32_MDMA_CTCR_DBURST_MASK |
956 STM32_MDMA_CTCR_SBURST_MASK | STM32_MDMA_CTCR_DINCOS_MASK |
957 STM32_MDMA_CTCR_SINCOS_MASK | STM32_MDMA_CTCR_DSIZE_MASK |
958 STM32_MDMA_CTCR_SSIZE_MASK | STM32_MDMA_CTCR_DINC_MASK |
959 STM32_MDMA_CTCR_SINC_MASK);
960 ctcr |= STM32_MDMA_CTCR_SWRM | STM32_MDMA_CTCR_SINC(STM32_MDMA_INC) |
961 STM32_MDMA_CTCR_DINC(STM32_MDMA_INC);
962
963
964 ctbr &= ~STM32_MDMA_CTBR_TSEL_MASK;
965
966
967 stm32_mdma_set_bus(dmadev, &ctbr, STM32_MDMA_CTBR_SBUS, src);
968 stm32_mdma_set_bus(dmadev, &ctbr, STM32_MDMA_CTBR_DBUS, dest);
969
970
971 cbndtr &= ~(STM32_MDMA_CBNDTR_BRC_MK | STM32_MDMA_CBNDTR_BRDUM |
972 STM32_MDMA_CBNDTR_BRSUM | STM32_MDMA_CBNDTR_BNDT_MASK);
973
974 if (len <= STM32_MDMA_MAX_BLOCK_LEN) {
975 cbndtr |= STM32_MDMA_CBNDTR_BNDT(len);
976 if (len <= STM32_MDMA_MAX_BUF_LEN) {
977
978 ccr |= STM32_MDMA_CCR_TCIE | STM32_MDMA_CCR_CTCIE;
979 ctcr |= STM32_MDMA_CTCR_TRGM(STM32_MDMA_BUFFER);
980 } else {
981
982 ccr |= STM32_MDMA_CCR_BTIE | STM32_MDMA_CCR_CTCIE;
983 ctcr |= STM32_MDMA_CTCR_TRGM(STM32_MDMA_BLOCK);
984 }
985
986 tlen = STM32_MDMA_MAX_BUF_LEN;
987 ctcr |= STM32_MDMA_CTCR_TLEN((tlen - 1));
988
989
990 max_width = stm32_mdma_get_max_width(src, len, tlen);
991 src_bus_width = stm32_mdma_get_width(chan, max_width);
992
993 max_burst = tlen / max_width;
994 best_burst = stm32_mdma_get_best_burst(len, tlen, max_burst,
995 max_width);
996 mdma_burst = ilog2(best_burst);
997
998 ctcr |= STM32_MDMA_CTCR_SBURST(mdma_burst) |
999 STM32_MDMA_CTCR_SSIZE(src_bus_width) |
1000 STM32_MDMA_CTCR_SINCOS(src_bus_width);
1001
1002
1003 max_width = stm32_mdma_get_max_width(dest, len, tlen);
1004 dst_bus_width = stm32_mdma_get_width(chan, max_width);
1005
1006 max_burst = tlen / max_width;
1007 best_burst = stm32_mdma_get_best_burst(len, tlen, max_burst,
1008 max_width);
1009 mdma_burst = ilog2(best_burst);
1010
1011 ctcr |= STM32_MDMA_CTCR_DBURST(mdma_burst) |
1012 STM32_MDMA_CTCR_DSIZE(dst_bus_width) |
1013 STM32_MDMA_CTCR_DINCOS(dst_bus_width);
1014
1015 if (dst_bus_width != src_bus_width)
1016 ctcr |= STM32_MDMA_CTCR_PKE;
1017
1018
1019 hwdesc = desc->node[0].hwdesc;
1020 hwdesc->ctcr = ctcr;
1021 hwdesc->cbndtr = cbndtr;
1022 hwdesc->csar = src;
1023 hwdesc->cdar = dest;
1024 hwdesc->cbrur = 0;
1025 hwdesc->clar = 0;
1026 hwdesc->ctbr = ctbr;
1027 hwdesc->cmar = 0;
1028 hwdesc->cmdr = 0;
1029
1030 stm32_mdma_dump_hwdesc(chan, &desc->node[0]);
1031 } else {
1032
1033 ctcr |= STM32_MDMA_CTCR_TRGM(STM32_MDMA_LINKED_LIST) |
1034 STM32_MDMA_CTCR_TLEN((STM32_MDMA_MAX_BUF_LEN - 1));
1035 ccr |= STM32_MDMA_CCR_BTIE | STM32_MDMA_CCR_CTCIE;
1036 tlen = STM32_MDMA_MAX_BUF_LEN;
1037
1038 for (i = 0, offset = 0; offset < len;
1039 i++, offset += xfer_count) {
1040 xfer_count = min_t(size_t, len - offset,
1041 STM32_MDMA_MAX_BLOCK_LEN);
1042
1043
1044 max_width = stm32_mdma_get_max_width(src, len, tlen);
1045 src_bus_width = stm32_mdma_get_width(chan, max_width);
1046
1047 max_burst = tlen / max_width;
1048 best_burst = stm32_mdma_get_best_burst(len, tlen,
1049 max_burst,
1050 max_width);
1051 mdma_burst = ilog2(best_burst);
1052
1053 ctcr |= STM32_MDMA_CTCR_SBURST(mdma_burst) |
1054 STM32_MDMA_CTCR_SSIZE(src_bus_width) |
1055 STM32_MDMA_CTCR_SINCOS(src_bus_width);
1056
1057
1058 max_width = stm32_mdma_get_max_width(dest, len, tlen);
1059 dst_bus_width = stm32_mdma_get_width(chan, max_width);
1060
1061 max_burst = tlen / max_width;
1062 best_burst = stm32_mdma_get_best_burst(len, tlen,
1063 max_burst,
1064 max_width);
1065 mdma_burst = ilog2(best_burst);
1066
1067 ctcr |= STM32_MDMA_CTCR_DBURST(mdma_burst) |
1068 STM32_MDMA_CTCR_DSIZE(dst_bus_width) |
1069 STM32_MDMA_CTCR_DINCOS(dst_bus_width);
1070
1071 if (dst_bus_width != src_bus_width)
1072 ctcr |= STM32_MDMA_CTCR_PKE;
1073
1074
1075 stm32_mdma_setup_hwdesc(chan, desc, DMA_MEM_TO_MEM, i,
1076 src + offset, dest + offset,
1077 xfer_count, ctcr, ctbr,
1078 i == count - 1, i == 0, false);
1079 }
1080 }
1081
1082 desc->ccr = ccr;
1083
1084 desc->cyclic = false;
1085
1086 return vchan_tx_prep(&chan->vchan, &desc->vdesc, flags);
1087}
1088
1089static void stm32_mdma_dump_reg(struct stm32_mdma_chan *chan)
1090{
1091 struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
1092
1093 dev_dbg(chan2dev(chan), "CCR: 0x%08x\n",
1094 stm32_mdma_read(dmadev, STM32_MDMA_CCR(chan->id)));
1095 dev_dbg(chan2dev(chan), "CTCR: 0x%08x\n",
1096 stm32_mdma_read(dmadev, STM32_MDMA_CTCR(chan->id)));
1097 dev_dbg(chan2dev(chan), "CBNDTR: 0x%08x\n",
1098 stm32_mdma_read(dmadev, STM32_MDMA_CBNDTR(chan->id)));
1099 dev_dbg(chan2dev(chan), "CSAR: 0x%08x\n",
1100 stm32_mdma_read(dmadev, STM32_MDMA_CSAR(chan->id)));
1101 dev_dbg(chan2dev(chan), "CDAR: 0x%08x\n",
1102 stm32_mdma_read(dmadev, STM32_MDMA_CDAR(chan->id)));
1103 dev_dbg(chan2dev(chan), "CBRUR: 0x%08x\n",
1104 stm32_mdma_read(dmadev, STM32_MDMA_CBRUR(chan->id)));
1105 dev_dbg(chan2dev(chan), "CLAR: 0x%08x\n",
1106 stm32_mdma_read(dmadev, STM32_MDMA_CLAR(chan->id)));
1107 dev_dbg(chan2dev(chan), "CTBR: 0x%08x\n",
1108 stm32_mdma_read(dmadev, STM32_MDMA_CTBR(chan->id)));
1109 dev_dbg(chan2dev(chan), "CMAR: 0x%08x\n",
1110 stm32_mdma_read(dmadev, STM32_MDMA_CMAR(chan->id)));
1111 dev_dbg(chan2dev(chan), "CMDR: 0x%08x\n",
1112 stm32_mdma_read(dmadev, STM32_MDMA_CMDR(chan->id)));
1113}
1114
1115static void stm32_mdma_start_transfer(struct stm32_mdma_chan *chan)
1116{
1117 struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
1118 struct virt_dma_desc *vdesc;
1119 struct stm32_mdma_hwdesc *hwdesc;
1120 u32 id = chan->id;
1121 u32 status, reg;
1122
1123 vdesc = vchan_next_desc(&chan->vchan);
1124 if (!vdesc) {
1125 chan->desc = NULL;
1126 return;
1127 }
1128
1129 list_del(&vdesc->node);
1130
1131 chan->desc = to_stm32_mdma_desc(vdesc);
1132 hwdesc = chan->desc->node[0].hwdesc;
1133 chan->curr_hwdesc = 0;
1134
1135 stm32_mdma_write(dmadev, STM32_MDMA_CCR(id), chan->desc->ccr);
1136 stm32_mdma_write(dmadev, STM32_MDMA_CTCR(id), hwdesc->ctcr);
1137 stm32_mdma_write(dmadev, STM32_MDMA_CBNDTR(id), hwdesc->cbndtr);
1138 stm32_mdma_write(dmadev, STM32_MDMA_CSAR(id), hwdesc->csar);
1139 stm32_mdma_write(dmadev, STM32_MDMA_CDAR(id), hwdesc->cdar);
1140 stm32_mdma_write(dmadev, STM32_MDMA_CBRUR(id), hwdesc->cbrur);
1141 stm32_mdma_write(dmadev, STM32_MDMA_CLAR(id), hwdesc->clar);
1142 stm32_mdma_write(dmadev, STM32_MDMA_CTBR(id), hwdesc->ctbr);
1143 stm32_mdma_write(dmadev, STM32_MDMA_CMAR(id), hwdesc->cmar);
1144 stm32_mdma_write(dmadev, STM32_MDMA_CMDR(id), hwdesc->cmdr);
1145
1146
1147 status = stm32_mdma_read(dmadev, STM32_MDMA_CISR(id));
1148 if (status)
1149 stm32_mdma_set_bits(dmadev, STM32_MDMA_CIFCR(id), status);
1150
1151 stm32_mdma_dump_reg(chan);
1152
1153
1154 stm32_mdma_set_bits(dmadev, STM32_MDMA_CCR(id), STM32_MDMA_CCR_EN);
1155
1156
1157 if (hwdesc->ctcr & STM32_MDMA_CTCR_SWRM) {
1158 reg = STM32_MDMA_CCR(id);
1159 stm32_mdma_set_bits(dmadev, reg, STM32_MDMA_CCR_SWRQ);
1160 }
1161
1162 chan->busy = true;
1163
1164 dev_dbg(chan2dev(chan), "vchan %pK: started\n", &chan->vchan);
1165}
1166
1167static void stm32_mdma_issue_pending(struct dma_chan *c)
1168{
1169 struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
1170 unsigned long flags;
1171
1172 spin_lock_irqsave(&chan->vchan.lock, flags);
1173
1174 if (!vchan_issue_pending(&chan->vchan))
1175 goto end;
1176
1177 dev_dbg(chan2dev(chan), "vchan %pK: issued\n", &chan->vchan);
1178
1179 if (!chan->desc && !chan->busy)
1180 stm32_mdma_start_transfer(chan);
1181
1182end:
1183 spin_unlock_irqrestore(&chan->vchan.lock, flags);
1184}
1185
1186static int stm32_mdma_pause(struct dma_chan *c)
1187{
1188 struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
1189 unsigned long flags;
1190 int ret;
1191
1192 spin_lock_irqsave(&chan->vchan.lock, flags);
1193 ret = stm32_mdma_disable_chan(chan);
1194 spin_unlock_irqrestore(&chan->vchan.lock, flags);
1195
1196 if (!ret)
1197 dev_dbg(chan2dev(chan), "vchan %pK: pause\n", &chan->vchan);
1198
1199 return ret;
1200}
1201
1202static int stm32_mdma_resume(struct dma_chan *c)
1203{
1204 struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
1205 struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
1206 struct stm32_mdma_hwdesc *hwdesc;
1207 unsigned long flags;
1208 u32 status, reg;
1209
1210 hwdesc = chan->desc->node[chan->curr_hwdesc].hwdesc;
1211
1212 spin_lock_irqsave(&chan->vchan.lock, flags);
1213
1214
1215 stm32_mdma_write(dmadev, STM32_MDMA_CCR(chan->id), chan->desc->ccr);
1216
1217
1218 status = stm32_mdma_read(dmadev, STM32_MDMA_CISR(chan->id));
1219 if (status)
1220 stm32_mdma_set_bits(dmadev, STM32_MDMA_CIFCR(chan->id), status);
1221
1222 stm32_mdma_dump_reg(chan);
1223
1224
1225 reg = STM32_MDMA_CCR(chan->id);
1226 stm32_mdma_set_bits(dmadev, reg, STM32_MDMA_CCR_EN);
1227
1228
1229 if (hwdesc->ctcr & STM32_MDMA_CTCR_SWRM)
1230 stm32_mdma_set_bits(dmadev, reg, STM32_MDMA_CCR_SWRQ);
1231
1232 spin_unlock_irqrestore(&chan->vchan.lock, flags);
1233
1234 dev_dbg(chan2dev(chan), "vchan %pK: resume\n", &chan->vchan);
1235
1236 return 0;
1237}
1238
1239static int stm32_mdma_terminate_all(struct dma_chan *c)
1240{
1241 struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
1242 unsigned long flags;
1243 LIST_HEAD(head);
1244
1245 spin_lock_irqsave(&chan->vchan.lock, flags);
1246 if (chan->desc) {
1247 vchan_terminate_vdesc(&chan->desc->vdesc);
1248 if (chan->busy)
1249 stm32_mdma_stop(chan);
1250 chan->desc = NULL;
1251 }
1252 vchan_get_all_descriptors(&chan->vchan, &head);
1253 spin_unlock_irqrestore(&chan->vchan.lock, flags);
1254
1255 vchan_dma_desc_free_list(&chan->vchan, &head);
1256
1257 return 0;
1258}
1259
1260static void stm32_mdma_synchronize(struct dma_chan *c)
1261{
1262 struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
1263
1264 vchan_synchronize(&chan->vchan);
1265}
1266
1267static int stm32_mdma_slave_config(struct dma_chan *c,
1268 struct dma_slave_config *config)
1269{
1270 struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
1271
1272 memcpy(&chan->dma_config, config, sizeof(*config));
1273
1274 return 0;
1275}
1276
1277static size_t stm32_mdma_desc_residue(struct stm32_mdma_chan *chan,
1278 struct stm32_mdma_desc *desc,
1279 u32 curr_hwdesc)
1280{
1281 struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
1282 struct stm32_mdma_hwdesc *hwdesc = desc->node[0].hwdesc;
1283 u32 cbndtr, residue, modulo, burst_size;
1284 int i;
1285
1286 residue = 0;
1287 for (i = curr_hwdesc + 1; i < desc->count; i++) {
1288 hwdesc = desc->node[i].hwdesc;
1289 residue += STM32_MDMA_CBNDTR_BNDT(hwdesc->cbndtr);
1290 }
1291 cbndtr = stm32_mdma_read(dmadev, STM32_MDMA_CBNDTR(chan->id));
1292 residue += cbndtr & STM32_MDMA_CBNDTR_BNDT_MASK;
1293
1294 if (!chan->mem_burst)
1295 return residue;
1296
1297 burst_size = chan->mem_burst * chan->mem_width;
1298 modulo = residue % burst_size;
1299 if (modulo)
1300 residue = residue - modulo + burst_size;
1301
1302 return residue;
1303}
1304
1305static enum dma_status stm32_mdma_tx_status(struct dma_chan *c,
1306 dma_cookie_t cookie,
1307 struct dma_tx_state *state)
1308{
1309 struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
1310 struct virt_dma_desc *vdesc;
1311 enum dma_status status;
1312 unsigned long flags;
1313 u32 residue = 0;
1314
1315 status = dma_cookie_status(c, cookie, state);
1316 if ((status == DMA_COMPLETE) || (!state))
1317 return status;
1318
1319 spin_lock_irqsave(&chan->vchan.lock, flags);
1320
1321 vdesc = vchan_find_desc(&chan->vchan, cookie);
1322 if (chan->desc && cookie == chan->desc->vdesc.tx.cookie)
1323 residue = stm32_mdma_desc_residue(chan, chan->desc,
1324 chan->curr_hwdesc);
1325 else if (vdesc)
1326 residue = stm32_mdma_desc_residue(chan,
1327 to_stm32_mdma_desc(vdesc), 0);
1328 dma_set_residue(state, residue);
1329
1330 spin_unlock_irqrestore(&chan->vchan.lock, flags);
1331
1332 return status;
1333}
1334
1335static void stm32_mdma_xfer_end(struct stm32_mdma_chan *chan)
1336{
1337 vchan_cookie_complete(&chan->desc->vdesc);
1338 chan->desc = NULL;
1339 chan->busy = false;
1340
1341
1342 stm32_mdma_start_transfer(chan);
1343}
1344
1345static irqreturn_t stm32_mdma_irq_handler(int irq, void *devid)
1346{
1347 struct stm32_mdma_device *dmadev = devid;
1348 struct stm32_mdma_chan *chan = devid;
1349 u32 reg, id, ien, status, flag;
1350
1351
1352 status = readl_relaxed(dmadev->base + STM32_MDMA_GISR0);
1353 if (status) {
1354 id = __ffs(status);
1355 } else {
1356 status = readl_relaxed(dmadev->base + STM32_MDMA_GISR1);
1357 if (!status) {
1358 dev_dbg(mdma2dev(dmadev), "spurious it\n");
1359 return IRQ_NONE;
1360 }
1361 id = __ffs(status);
1362
1363
1364
1365
1366 id += 32;
1367 }
1368
1369 chan = &dmadev->chan[id];
1370 if (!chan) {
1371 dev_dbg(mdma2dev(dmadev), "MDMA channel not initialized\n");
1372 goto exit;
1373 }
1374
1375
1376 spin_lock(&chan->vchan.lock);
1377 status = stm32_mdma_read(dmadev, STM32_MDMA_CISR(chan->id));
1378 ien = stm32_mdma_read(dmadev, STM32_MDMA_CCR(chan->id));
1379 ien &= STM32_MDMA_CCR_IRQ_MASK;
1380 ien >>= 1;
1381
1382 if (!(status & ien)) {
1383 spin_unlock(&chan->vchan.lock);
1384 dev_dbg(chan2dev(chan),
1385 "spurious it (status=0x%04x, ien=0x%04x)\n",
1386 status, ien);
1387 return IRQ_NONE;
1388 }
1389
1390 flag = __ffs(status & ien);
1391 reg = STM32_MDMA_CIFCR(chan->id);
1392
1393 switch (1 << flag) {
1394 case STM32_MDMA_CISR_TEIF:
1395 id = chan->id;
1396 status = readl_relaxed(dmadev->base + STM32_MDMA_CESR(id));
1397 dev_err(chan2dev(chan), "Transfer Err: stat=0x%08x\n", status);
1398 stm32_mdma_set_bits(dmadev, reg, STM32_MDMA_CIFCR_CTEIF);
1399 break;
1400
1401 case STM32_MDMA_CISR_CTCIF:
1402 stm32_mdma_set_bits(dmadev, reg, STM32_MDMA_CIFCR_CCTCIF);
1403 stm32_mdma_xfer_end(chan);
1404 break;
1405
1406 case STM32_MDMA_CISR_BRTIF:
1407 stm32_mdma_set_bits(dmadev, reg, STM32_MDMA_CIFCR_CBRTIF);
1408 break;
1409
1410 case STM32_MDMA_CISR_BTIF:
1411 stm32_mdma_set_bits(dmadev, reg, STM32_MDMA_CIFCR_CBTIF);
1412 chan->curr_hwdesc++;
1413 if (chan->desc && chan->desc->cyclic) {
1414 if (chan->curr_hwdesc == chan->desc->count)
1415 chan->curr_hwdesc = 0;
1416 vchan_cyclic_callback(&chan->desc->vdesc);
1417 }
1418 break;
1419
1420 case STM32_MDMA_CISR_TCIF:
1421 stm32_mdma_set_bits(dmadev, reg, STM32_MDMA_CIFCR_CLTCIF);
1422 break;
1423
1424 default:
1425 dev_err(chan2dev(chan), "it %d unhandled (status=0x%04x)\n",
1426 1 << flag, status);
1427 }
1428
1429 spin_unlock(&chan->vchan.lock);
1430
1431exit:
1432 return IRQ_HANDLED;
1433}
1434
1435static int stm32_mdma_alloc_chan_resources(struct dma_chan *c)
1436{
1437 struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
1438 struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
1439 int ret;
1440
1441 chan->desc_pool = dmam_pool_create(dev_name(&c->dev->device),
1442 c->device->dev,
1443 sizeof(struct stm32_mdma_hwdesc),
1444 __alignof__(struct stm32_mdma_hwdesc),
1445 0);
1446 if (!chan->desc_pool) {
1447 dev_err(chan2dev(chan), "failed to allocate descriptor pool\n");
1448 return -ENOMEM;
1449 }
1450
1451 ret = pm_runtime_get_sync(dmadev->ddev.dev);
1452 if (ret < 0)
1453 return ret;
1454
1455 ret = stm32_mdma_disable_chan(chan);
1456 if (ret < 0)
1457 pm_runtime_put(dmadev->ddev.dev);
1458
1459 return ret;
1460}
1461
1462static void stm32_mdma_free_chan_resources(struct dma_chan *c)
1463{
1464 struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
1465 struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
1466 unsigned long flags;
1467
1468 dev_dbg(chan2dev(chan), "Freeing channel %d\n", chan->id);
1469
1470 if (chan->busy) {
1471 spin_lock_irqsave(&chan->vchan.lock, flags);
1472 stm32_mdma_stop(chan);
1473 chan->desc = NULL;
1474 spin_unlock_irqrestore(&chan->vchan.lock, flags);
1475 }
1476
1477 pm_runtime_put(dmadev->ddev.dev);
1478 vchan_free_chan_resources(to_virt_chan(c));
1479 dmam_pool_destroy(chan->desc_pool);
1480 chan->desc_pool = NULL;
1481}
1482
1483static struct dma_chan *stm32_mdma_of_xlate(struct of_phandle_args *dma_spec,
1484 struct of_dma *ofdma)
1485{
1486 struct stm32_mdma_device *dmadev = ofdma->of_dma_data;
1487 struct stm32_mdma_chan *chan;
1488 struct dma_chan *c;
1489 struct stm32_mdma_chan_config config;
1490
1491 if (dma_spec->args_count < 5) {
1492 dev_err(mdma2dev(dmadev), "Bad number of args\n");
1493 return NULL;
1494 }
1495
1496 config.request = dma_spec->args[0];
1497 config.priority_level = dma_spec->args[1];
1498 config.transfer_config = dma_spec->args[2];
1499 config.mask_addr = dma_spec->args[3];
1500 config.mask_data = dma_spec->args[4];
1501
1502 if (config.request >= dmadev->nr_requests) {
1503 dev_err(mdma2dev(dmadev), "Bad request line\n");
1504 return NULL;
1505 }
1506
1507 if (config.priority_level > STM32_MDMA_VERY_HIGH_PRIORITY) {
1508 dev_err(mdma2dev(dmadev), "Priority level not supported\n");
1509 return NULL;
1510 }
1511
1512 c = dma_get_any_slave_channel(&dmadev->ddev);
1513 if (!c) {
1514 dev_err(mdma2dev(dmadev), "No more channels available\n");
1515 return NULL;
1516 }
1517
1518 chan = to_stm32_mdma_chan(c);
1519 chan->chan_config = config;
1520
1521 return c;
1522}
1523
1524static const struct of_device_id stm32_mdma_of_match[] = {
1525 { .compatible = "st,stm32h7-mdma", },
1526 { },
1527};
1528MODULE_DEVICE_TABLE(of, stm32_mdma_of_match);
1529
1530static int stm32_mdma_probe(struct platform_device *pdev)
1531{
1532 struct stm32_mdma_chan *chan;
1533 struct stm32_mdma_device *dmadev;
1534 struct dma_device *dd;
1535 struct device_node *of_node;
1536 struct resource *res;
1537 struct reset_control *rst;
1538 u32 nr_channels, nr_requests;
1539 int i, count, ret;
1540
1541 of_node = pdev->dev.of_node;
1542 if (!of_node)
1543 return -ENODEV;
1544
1545 ret = device_property_read_u32(&pdev->dev, "dma-channels",
1546 &nr_channels);
1547 if (ret) {
1548 nr_channels = STM32_MDMA_MAX_CHANNELS;
1549 dev_warn(&pdev->dev, "MDMA defaulting on %i channels\n",
1550 nr_channels);
1551 }
1552
1553 ret = device_property_read_u32(&pdev->dev, "dma-requests",
1554 &nr_requests);
1555 if (ret) {
1556 nr_requests = STM32_MDMA_MAX_REQUESTS;
1557 dev_warn(&pdev->dev, "MDMA defaulting on %i request lines\n",
1558 nr_requests);
1559 }
1560
1561 count = device_property_count_u32(&pdev->dev, "st,ahb-addr-masks");
1562 if (count < 0)
1563 count = 0;
1564
1565 dmadev = devm_kzalloc(&pdev->dev, sizeof(*dmadev) + sizeof(u32) * count,
1566 GFP_KERNEL);
1567 if (!dmadev)
1568 return -ENOMEM;
1569
1570 dmadev->nr_channels = nr_channels;
1571 dmadev->nr_requests = nr_requests;
1572 device_property_read_u32_array(&pdev->dev, "st,ahb-addr-masks",
1573 dmadev->ahb_addr_masks,
1574 count);
1575 dmadev->nr_ahb_addr_masks = count;
1576
1577 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1578 dmadev->base = devm_ioremap_resource(&pdev->dev, res);
1579 if (IS_ERR(dmadev->base))
1580 return PTR_ERR(dmadev->base);
1581
1582 dmadev->clk = devm_clk_get(&pdev->dev, NULL);
1583 if (IS_ERR(dmadev->clk)) {
1584 ret = PTR_ERR(dmadev->clk);
1585 if (ret != -EPROBE_DEFER)
1586 dev_err(&pdev->dev, "Missing clock controller\n");
1587 return ret;
1588 }
1589
1590 ret = clk_prepare_enable(dmadev->clk);
1591 if (ret < 0) {
1592 dev_err(&pdev->dev, "clk_prep_enable error: %d\n", ret);
1593 return ret;
1594 }
1595
1596 rst = devm_reset_control_get(&pdev->dev, NULL);
1597 if (IS_ERR(rst)) {
1598 ret = PTR_ERR(rst);
1599 if (ret == -EPROBE_DEFER)
1600 goto err_clk;
1601 } else {
1602 reset_control_assert(rst);
1603 udelay(2);
1604 reset_control_deassert(rst);
1605 }
1606
1607 dd = &dmadev->ddev;
1608 dma_cap_set(DMA_SLAVE, dd->cap_mask);
1609 dma_cap_set(DMA_PRIVATE, dd->cap_mask);
1610 dma_cap_set(DMA_CYCLIC, dd->cap_mask);
1611 dma_cap_set(DMA_MEMCPY, dd->cap_mask);
1612 dd->device_alloc_chan_resources = stm32_mdma_alloc_chan_resources;
1613 dd->device_free_chan_resources = stm32_mdma_free_chan_resources;
1614 dd->device_tx_status = stm32_mdma_tx_status;
1615 dd->device_issue_pending = stm32_mdma_issue_pending;
1616 dd->device_prep_slave_sg = stm32_mdma_prep_slave_sg;
1617 dd->device_prep_dma_cyclic = stm32_mdma_prep_dma_cyclic;
1618 dd->device_prep_dma_memcpy = stm32_mdma_prep_dma_memcpy;
1619 dd->device_config = stm32_mdma_slave_config;
1620 dd->device_pause = stm32_mdma_pause;
1621 dd->device_resume = stm32_mdma_resume;
1622 dd->device_terminate_all = stm32_mdma_terminate_all;
1623 dd->device_synchronize = stm32_mdma_synchronize;
1624 dd->descriptor_reuse = true;
1625
1626 dd->src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
1627 BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
1628 BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) |
1629 BIT(DMA_SLAVE_BUSWIDTH_8_BYTES);
1630 dd->dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
1631 BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
1632 BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) |
1633 BIT(DMA_SLAVE_BUSWIDTH_8_BYTES);
1634 dd->directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV) |
1635 BIT(DMA_MEM_TO_MEM);
1636 dd->residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
1637 dd->max_burst = STM32_MDMA_MAX_BURST;
1638 dd->dev = &pdev->dev;
1639 INIT_LIST_HEAD(&dd->channels);
1640
1641 for (i = 0; i < dmadev->nr_channels; i++) {
1642 chan = &dmadev->chan[i];
1643 chan->id = i;
1644 chan->vchan.desc_free = stm32_mdma_desc_free;
1645 vchan_init(&chan->vchan, dd);
1646 }
1647
1648 dmadev->irq = platform_get_irq(pdev, 0);
1649 if (dmadev->irq < 0) {
1650 ret = dmadev->irq;
1651 goto err_clk;
1652 }
1653
1654 ret = devm_request_irq(&pdev->dev, dmadev->irq, stm32_mdma_irq_handler,
1655 0, dev_name(&pdev->dev), dmadev);
1656 if (ret) {
1657 dev_err(&pdev->dev, "failed to request IRQ\n");
1658 goto err_clk;
1659 }
1660
1661 ret = dmaenginem_async_device_register(dd);
1662 if (ret)
1663 goto err_clk;
1664
1665 ret = of_dma_controller_register(of_node, stm32_mdma_of_xlate, dmadev);
1666 if (ret < 0) {
1667 dev_err(&pdev->dev,
1668 "STM32 MDMA DMA OF registration failed %d\n", ret);
1669 goto err_clk;
1670 }
1671
1672 platform_set_drvdata(pdev, dmadev);
1673 pm_runtime_set_active(&pdev->dev);
1674 pm_runtime_enable(&pdev->dev);
1675 pm_runtime_get_noresume(&pdev->dev);
1676 pm_runtime_put(&pdev->dev);
1677
1678 dev_info(&pdev->dev, "STM32 MDMA driver registered\n");
1679
1680 return 0;
1681
1682err_clk:
1683 clk_disable_unprepare(dmadev->clk);
1684
1685 return ret;
1686}
1687
1688#ifdef CONFIG_PM
1689static int stm32_mdma_runtime_suspend(struct device *dev)
1690{
1691 struct stm32_mdma_device *dmadev = dev_get_drvdata(dev);
1692
1693 clk_disable_unprepare(dmadev->clk);
1694
1695 return 0;
1696}
1697
1698static int stm32_mdma_runtime_resume(struct device *dev)
1699{
1700 struct stm32_mdma_device *dmadev = dev_get_drvdata(dev);
1701 int ret;
1702
1703 ret = clk_prepare_enable(dmadev->clk);
1704 if (ret) {
1705 dev_err(dev, "failed to prepare_enable clock\n");
1706 return ret;
1707 }
1708
1709 return 0;
1710}
1711#endif
1712
1713#ifdef CONFIG_PM_SLEEP
1714static int stm32_mdma_pm_suspend(struct device *dev)
1715{
1716 struct stm32_mdma_device *dmadev = dev_get_drvdata(dev);
1717 u32 ccr, id;
1718 int ret;
1719
1720 ret = pm_runtime_get_sync(dev);
1721 if (ret < 0)
1722 return ret;
1723
1724 for (id = 0; id < dmadev->nr_channels; id++) {
1725 ccr = stm32_mdma_read(dmadev, STM32_MDMA_CCR(id));
1726 if (ccr & STM32_MDMA_CCR_EN) {
1727 dev_warn(dev, "Suspend is prevented by Chan %i\n", id);
1728 return -EBUSY;
1729 }
1730 }
1731
1732 pm_runtime_put_sync(dev);
1733
1734 pm_runtime_force_suspend(dev);
1735
1736 return 0;
1737}
1738
1739static int stm32_mdma_pm_resume(struct device *dev)
1740{
1741 return pm_runtime_force_resume(dev);
1742}
1743#endif
1744
1745static const struct dev_pm_ops stm32_mdma_pm_ops = {
1746 SET_SYSTEM_SLEEP_PM_OPS(stm32_mdma_pm_suspend, stm32_mdma_pm_resume)
1747 SET_RUNTIME_PM_OPS(stm32_mdma_runtime_suspend,
1748 stm32_mdma_runtime_resume, NULL)
1749};
1750
1751static struct platform_driver stm32_mdma_driver = {
1752 .probe = stm32_mdma_probe,
1753 .driver = {
1754 .name = "stm32-mdma",
1755 .of_match_table = stm32_mdma_of_match,
1756 .pm = &stm32_mdma_pm_ops,
1757 },
1758};
1759
1760static int __init stm32_mdma_init(void)
1761{
1762 return platform_driver_register(&stm32_mdma_driver);
1763}
1764
1765subsys_initcall(stm32_mdma_init);
1766
1767MODULE_DESCRIPTION("Driver for STM32 MDMA controller");
1768MODULE_AUTHOR("M'boumba Cedric Madianga <cedric.madianga@gmail.com>");
1769MODULE_AUTHOR("Pierre-Yves Mordret <pierre-yves.mordret@st.com>");
1770MODULE_LICENSE("GPL v2");
1771
