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