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9#include <linux/clk.h>
10#include <linux/dmapool.h>
11#include <linux/init.h>
12#include <linux/interrupt.h>
13#include <linux/module.h>
14#include <linux/of.h>
15#include <linux/of_device.h>
16#include <linux/of_dma.h>
17#include <linux/platform_device.h>
18#include <linux/slab.h>
19
20#include "dmaengine.h"
21#include "virt-dma.h"
22
23
24#define JZ_DMA_REG_DMAC 0x00
25#define JZ_DMA_REG_DIRQP 0x04
26#define JZ_DMA_REG_DDR 0x08
27#define JZ_DMA_REG_DDRS 0x0c
28#define JZ_DMA_REG_DCKE 0x10
29#define JZ_DMA_REG_DCKES 0x14
30#define JZ_DMA_REG_DCKEC 0x18
31#define JZ_DMA_REG_DMACP 0x1c
32#define JZ_DMA_REG_DSIRQP 0x20
33#define JZ_DMA_REG_DSIRQM 0x24
34#define JZ_DMA_REG_DCIRQP 0x28
35#define JZ_DMA_REG_DCIRQM 0x2c
36
37
38#define JZ_DMA_REG_CHAN(n) (n * 0x20)
39#define JZ_DMA_REG_DSA 0x00
40#define JZ_DMA_REG_DTA 0x04
41#define JZ_DMA_REG_DTC 0x08
42#define JZ_DMA_REG_DRT 0x0c
43#define JZ_DMA_REG_DCS 0x10
44#define JZ_DMA_REG_DCM 0x14
45#define JZ_DMA_REG_DDA 0x18
46#define JZ_DMA_REG_DSD 0x1c
47
48#define JZ_DMA_DMAC_DMAE BIT(0)
49#define JZ_DMA_DMAC_AR BIT(2)
50#define JZ_DMA_DMAC_HLT BIT(3)
51#define JZ_DMA_DMAC_FAIC BIT(27)
52#define JZ_DMA_DMAC_FMSC BIT(31)
53
54#define JZ_DMA_DRT_AUTO 0x8
55
56#define JZ_DMA_DCS_CTE BIT(0)
57#define JZ_DMA_DCS_HLT BIT(2)
58#define JZ_DMA_DCS_TT BIT(3)
59#define JZ_DMA_DCS_AR BIT(4)
60#define JZ_DMA_DCS_DES8 BIT(30)
61
62#define JZ_DMA_DCM_LINK BIT(0)
63#define JZ_DMA_DCM_TIE BIT(1)
64#define JZ_DMA_DCM_STDE BIT(2)
65#define JZ_DMA_DCM_TSZ_SHIFT 8
66#define JZ_DMA_DCM_TSZ_MASK (0x7 << JZ_DMA_DCM_TSZ_SHIFT)
67#define JZ_DMA_DCM_DP_SHIFT 12
68#define JZ_DMA_DCM_SP_SHIFT 14
69#define JZ_DMA_DCM_DAI BIT(22)
70#define JZ_DMA_DCM_SAI BIT(23)
71
72#define JZ_DMA_SIZE_4_BYTE 0x0
73#define JZ_DMA_SIZE_1_BYTE 0x1
74#define JZ_DMA_SIZE_2_BYTE 0x2
75#define JZ_DMA_SIZE_16_BYTE 0x3
76#define JZ_DMA_SIZE_32_BYTE 0x4
77#define JZ_DMA_SIZE_64_BYTE 0x5
78#define JZ_DMA_SIZE_128_BYTE 0x6
79
80#define JZ_DMA_WIDTH_32_BIT 0x0
81#define JZ_DMA_WIDTH_8_BIT 0x1
82#define JZ_DMA_WIDTH_16_BIT 0x2
83
84#define JZ_DMA_BUSWIDTHS (BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \
85 BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \
86 BIT(DMA_SLAVE_BUSWIDTH_4_BYTES))
87
88#define JZ4780_DMA_CTRL_OFFSET 0x1000
89
90
91#define JZ_SOC_DATA_ALLOW_LEGACY_DT BIT(0)
92#define JZ_SOC_DATA_PROGRAMMABLE_DMA BIT(1)
93#define JZ_SOC_DATA_PER_CHAN_PM BIT(2)
94#define JZ_SOC_DATA_NO_DCKES_DCKEC BIT(3)
95
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98
99
100
101
102
103
104
105struct jz4780_dma_hwdesc {
106 uint32_t dcm;
107 uint32_t dsa;
108 uint32_t dta;
109 uint32_t dtc;
110};
111
112
113#define JZ_DMA_DESC_BLOCK_SIZE PAGE_SIZE
114#define JZ_DMA_MAX_DESC \
115 (JZ_DMA_DESC_BLOCK_SIZE / sizeof(struct jz4780_dma_hwdesc))
116
117struct jz4780_dma_desc {
118 struct virt_dma_desc vdesc;
119
120 struct jz4780_dma_hwdesc *desc;
121 dma_addr_t desc_phys;
122 unsigned int count;
123 enum dma_transaction_type type;
124 uint32_t status;
125};
126
127struct jz4780_dma_chan {
128 struct virt_dma_chan vchan;
129 unsigned int id;
130 struct dma_pool *desc_pool;
131
132 uint32_t transfer_type;
133 uint32_t transfer_shift;
134 struct dma_slave_config config;
135
136 struct jz4780_dma_desc *desc;
137 unsigned int curr_hwdesc;
138};
139
140struct jz4780_dma_soc_data {
141 unsigned int nb_channels;
142 unsigned int transfer_ord_max;
143 unsigned long flags;
144};
145
146struct jz4780_dma_dev {
147 struct dma_device dma_device;
148 void __iomem *chn_base;
149 void __iomem *ctrl_base;
150 struct clk *clk;
151 unsigned int irq;
152 const struct jz4780_dma_soc_data *soc_data;
153
154 uint32_t chan_reserved;
155 struct jz4780_dma_chan chan[];
156};
157
158struct jz4780_dma_filter_data {
159 uint32_t transfer_type;
160 int channel;
161};
162
163static inline struct jz4780_dma_chan *to_jz4780_dma_chan(struct dma_chan *chan)
164{
165 return container_of(chan, struct jz4780_dma_chan, vchan.chan);
166}
167
168static inline struct jz4780_dma_desc *to_jz4780_dma_desc(
169 struct virt_dma_desc *vdesc)
170{
171 return container_of(vdesc, struct jz4780_dma_desc, vdesc);
172}
173
174static inline struct jz4780_dma_dev *jz4780_dma_chan_parent(
175 struct jz4780_dma_chan *jzchan)
176{
177 return container_of(jzchan->vchan.chan.device, struct jz4780_dma_dev,
178 dma_device);
179}
180
181static inline uint32_t jz4780_dma_chn_readl(struct jz4780_dma_dev *jzdma,
182 unsigned int chn, unsigned int reg)
183{
184 return readl(jzdma->chn_base + reg + JZ_DMA_REG_CHAN(chn));
185}
186
187static inline void jz4780_dma_chn_writel(struct jz4780_dma_dev *jzdma,
188 unsigned int chn, unsigned int reg, uint32_t val)
189{
190 writel(val, jzdma->chn_base + reg + JZ_DMA_REG_CHAN(chn));
191}
192
193static inline uint32_t jz4780_dma_ctrl_readl(struct jz4780_dma_dev *jzdma,
194 unsigned int reg)
195{
196 return readl(jzdma->ctrl_base + reg);
197}
198
199static inline void jz4780_dma_ctrl_writel(struct jz4780_dma_dev *jzdma,
200 unsigned int reg, uint32_t val)
201{
202 writel(val, jzdma->ctrl_base + reg);
203}
204
205static inline void jz4780_dma_chan_enable(struct jz4780_dma_dev *jzdma,
206 unsigned int chn)
207{
208 if (jzdma->soc_data->flags & JZ_SOC_DATA_PER_CHAN_PM) {
209 unsigned int reg;
210
211 if (jzdma->soc_data->flags & JZ_SOC_DATA_NO_DCKES_DCKEC)
212 reg = JZ_DMA_REG_DCKE;
213 else
214 reg = JZ_DMA_REG_DCKES;
215
216 jz4780_dma_ctrl_writel(jzdma, reg, BIT(chn));
217 }
218}
219
220static inline void jz4780_dma_chan_disable(struct jz4780_dma_dev *jzdma,
221 unsigned int chn)
222{
223 if ((jzdma->soc_data->flags & JZ_SOC_DATA_PER_CHAN_PM) &&
224 !(jzdma->soc_data->flags & JZ_SOC_DATA_NO_DCKES_DCKEC))
225 jz4780_dma_ctrl_writel(jzdma, JZ_DMA_REG_DCKEC, BIT(chn));
226}
227
228static struct jz4780_dma_desc *jz4780_dma_desc_alloc(
229 struct jz4780_dma_chan *jzchan, unsigned int count,
230 enum dma_transaction_type type)
231{
232 struct jz4780_dma_desc *desc;
233
234 if (count > JZ_DMA_MAX_DESC)
235 return NULL;
236
237 desc = kzalloc(sizeof(*desc), GFP_NOWAIT);
238 if (!desc)
239 return NULL;
240
241 desc->desc = dma_pool_alloc(jzchan->desc_pool, GFP_NOWAIT,
242 &desc->desc_phys);
243 if (!desc->desc) {
244 kfree(desc);
245 return NULL;
246 }
247
248 desc->count = count;
249 desc->type = type;
250 return desc;
251}
252
253static void jz4780_dma_desc_free(struct virt_dma_desc *vdesc)
254{
255 struct jz4780_dma_desc *desc = to_jz4780_dma_desc(vdesc);
256 struct jz4780_dma_chan *jzchan = to_jz4780_dma_chan(vdesc->tx.chan);
257
258 dma_pool_free(jzchan->desc_pool, desc->desc, desc->desc_phys);
259 kfree(desc);
260}
261
262static uint32_t jz4780_dma_transfer_size(struct jz4780_dma_chan *jzchan,
263 unsigned long val, uint32_t *shift)
264{
265 struct jz4780_dma_dev *jzdma = jz4780_dma_chan_parent(jzchan);
266 int ord = ffs(val) - 1;
267
268
269
270
271
272
273
274
275 if (ord == 3)
276 ord = 2;
277 else if (ord > jzdma->soc_data->transfer_ord_max)
278 ord = jzdma->soc_data->transfer_ord_max;
279
280 *shift = ord;
281
282 switch (ord) {
283 case 0:
284 return JZ_DMA_SIZE_1_BYTE;
285 case 1:
286 return JZ_DMA_SIZE_2_BYTE;
287 case 2:
288 return JZ_DMA_SIZE_4_BYTE;
289 case 4:
290 return JZ_DMA_SIZE_16_BYTE;
291 case 5:
292 return JZ_DMA_SIZE_32_BYTE;
293 case 6:
294 return JZ_DMA_SIZE_64_BYTE;
295 default:
296 return JZ_DMA_SIZE_128_BYTE;
297 }
298}
299
300static int jz4780_dma_setup_hwdesc(struct jz4780_dma_chan *jzchan,
301 struct jz4780_dma_hwdesc *desc, dma_addr_t addr, size_t len,
302 enum dma_transfer_direction direction)
303{
304 struct dma_slave_config *config = &jzchan->config;
305 uint32_t width, maxburst, tsz;
306
307 if (direction == DMA_MEM_TO_DEV) {
308 desc->dcm = JZ_DMA_DCM_SAI;
309 desc->dsa = addr;
310 desc->dta = config->dst_addr;
311
312 width = config->dst_addr_width;
313 maxburst = config->dst_maxburst;
314 } else {
315 desc->dcm = JZ_DMA_DCM_DAI;
316 desc->dsa = config->src_addr;
317 desc->dta = addr;
318
319 width = config->src_addr_width;
320 maxburst = config->src_maxburst;
321 }
322
323
324
325
326
327
328
329
330 tsz = jz4780_dma_transfer_size(jzchan, addr | len | (width * maxburst),
331 &jzchan->transfer_shift);
332
333 switch (width) {
334 case DMA_SLAVE_BUSWIDTH_1_BYTE:
335 case DMA_SLAVE_BUSWIDTH_2_BYTES:
336 break;
337 case DMA_SLAVE_BUSWIDTH_4_BYTES:
338 width = JZ_DMA_WIDTH_32_BIT;
339 break;
340 default:
341 return -EINVAL;
342 }
343
344 desc->dcm |= tsz << JZ_DMA_DCM_TSZ_SHIFT;
345 desc->dcm |= width << JZ_DMA_DCM_SP_SHIFT;
346 desc->dcm |= width << JZ_DMA_DCM_DP_SHIFT;
347
348 desc->dtc = len >> jzchan->transfer_shift;
349 return 0;
350}
351
352static struct dma_async_tx_descriptor *jz4780_dma_prep_slave_sg(
353 struct dma_chan *chan, struct scatterlist *sgl, unsigned int sg_len,
354 enum dma_transfer_direction direction, unsigned long flags,
355 void *context)
356{
357 struct jz4780_dma_chan *jzchan = to_jz4780_dma_chan(chan);
358 struct jz4780_dma_desc *desc;
359 unsigned int i;
360 int err;
361
362 desc = jz4780_dma_desc_alloc(jzchan, sg_len, DMA_SLAVE);
363 if (!desc)
364 return NULL;
365
366 for (i = 0; i < sg_len; i++) {
367 err = jz4780_dma_setup_hwdesc(jzchan, &desc->desc[i],
368 sg_dma_address(&sgl[i]),
369 sg_dma_len(&sgl[i]),
370 direction);
371 if (err < 0) {
372 jz4780_dma_desc_free(&jzchan->desc->vdesc);
373 return NULL;
374 }
375
376 desc->desc[i].dcm |= JZ_DMA_DCM_TIE;
377
378 if (i != (sg_len - 1)) {
379
380 desc->desc[i].dcm |= JZ_DMA_DCM_LINK;
381
382
383
384
385
386
387 desc->desc[i].dtc |=
388 (((i + 1) * sizeof(*desc->desc)) >> 4) << 24;
389 }
390 }
391
392 return vchan_tx_prep(&jzchan->vchan, &desc->vdesc, flags);
393}
394
395static struct dma_async_tx_descriptor *jz4780_dma_prep_dma_cyclic(
396 struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len,
397 size_t period_len, enum dma_transfer_direction direction,
398 unsigned long flags)
399{
400 struct jz4780_dma_chan *jzchan = to_jz4780_dma_chan(chan);
401 struct jz4780_dma_desc *desc;
402 unsigned int periods, i;
403 int err;
404
405 if (buf_len % period_len)
406 return NULL;
407
408 periods = buf_len / period_len;
409
410 desc = jz4780_dma_desc_alloc(jzchan, periods, DMA_CYCLIC);
411 if (!desc)
412 return NULL;
413
414 for (i = 0; i < periods; i++) {
415 err = jz4780_dma_setup_hwdesc(jzchan, &desc->desc[i], buf_addr,
416 period_len, direction);
417 if (err < 0) {
418 jz4780_dma_desc_free(&jzchan->desc->vdesc);
419 return NULL;
420 }
421
422 buf_addr += period_len;
423
424
425
426
427
428
429
430 desc->desc[i].dcm |= JZ_DMA_DCM_TIE | JZ_DMA_DCM_LINK;
431
432
433
434
435
436
437
438 if (i != (periods - 1)) {
439 desc->desc[i].dtc |=
440 (((i + 1) * sizeof(*desc->desc)) >> 4) << 24;
441 }
442 }
443
444 return vchan_tx_prep(&jzchan->vchan, &desc->vdesc, flags);
445}
446
447static struct dma_async_tx_descriptor *jz4780_dma_prep_dma_memcpy(
448 struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
449 size_t len, unsigned long flags)
450{
451 struct jz4780_dma_chan *jzchan = to_jz4780_dma_chan(chan);
452 struct jz4780_dma_desc *desc;
453 uint32_t tsz;
454
455 desc = jz4780_dma_desc_alloc(jzchan, 1, DMA_MEMCPY);
456 if (!desc)
457 return NULL;
458
459 tsz = jz4780_dma_transfer_size(jzchan, dest | src | len,
460 &jzchan->transfer_shift);
461
462 jzchan->transfer_type = JZ_DMA_DRT_AUTO;
463
464 desc->desc[0].dsa = src;
465 desc->desc[0].dta = dest;
466 desc->desc[0].dcm = JZ_DMA_DCM_TIE | JZ_DMA_DCM_SAI | JZ_DMA_DCM_DAI |
467 tsz << JZ_DMA_DCM_TSZ_SHIFT |
468 JZ_DMA_WIDTH_32_BIT << JZ_DMA_DCM_SP_SHIFT |
469 JZ_DMA_WIDTH_32_BIT << JZ_DMA_DCM_DP_SHIFT;
470 desc->desc[0].dtc = len >> jzchan->transfer_shift;
471
472 return vchan_tx_prep(&jzchan->vchan, &desc->vdesc, flags);
473}
474
475static void jz4780_dma_begin(struct jz4780_dma_chan *jzchan)
476{
477 struct jz4780_dma_dev *jzdma = jz4780_dma_chan_parent(jzchan);
478 struct virt_dma_desc *vdesc;
479 unsigned int i;
480 dma_addr_t desc_phys;
481
482 if (!jzchan->desc) {
483 vdesc = vchan_next_desc(&jzchan->vchan);
484 if (!vdesc)
485 return;
486
487 list_del(&vdesc->node);
488
489 jzchan->desc = to_jz4780_dma_desc(vdesc);
490 jzchan->curr_hwdesc = 0;
491
492 if (jzchan->desc->type == DMA_CYCLIC && vdesc->tx.callback) {
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507 for (i = 0; i < jzchan->desc->count; i++)
508 jzchan->desc->desc[i].dcm &= ~JZ_DMA_DCM_LINK;
509 }
510 } else {
511
512
513
514
515
516 jzchan->curr_hwdesc =
517 (jzchan->curr_hwdesc + 1) % jzchan->desc->count;
518 }
519
520
521 jz4780_dma_chan_enable(jzdma, jzchan->id);
522
523
524 jz4780_dma_chn_writel(jzdma, jzchan->id, JZ_DMA_REG_DCS, 0);
525
526
527 jz4780_dma_chn_writel(jzdma, jzchan->id, JZ_DMA_REG_DRT,
528 jzchan->transfer_type);
529
530
531
532
533
534
535
536 jz4780_dma_chn_writel(jzdma, jzchan->id, JZ_DMA_REG_DTC,
537 jzchan->desc->desc[jzchan->curr_hwdesc].dtc);
538
539
540 desc_phys = jzchan->desc->desc_phys +
541 (jzchan->curr_hwdesc * sizeof(*jzchan->desc->desc));
542 jz4780_dma_chn_writel(jzdma, jzchan->id, JZ_DMA_REG_DDA, desc_phys);
543 jz4780_dma_ctrl_writel(jzdma, JZ_DMA_REG_DDRS, BIT(jzchan->id));
544
545
546 jz4780_dma_chn_writel(jzdma, jzchan->id, JZ_DMA_REG_DCS,
547 JZ_DMA_DCS_CTE);
548}
549
550static void jz4780_dma_issue_pending(struct dma_chan *chan)
551{
552 struct jz4780_dma_chan *jzchan = to_jz4780_dma_chan(chan);
553 unsigned long flags;
554
555 spin_lock_irqsave(&jzchan->vchan.lock, flags);
556
557 if (vchan_issue_pending(&jzchan->vchan) && !jzchan->desc)
558 jz4780_dma_begin(jzchan);
559
560 spin_unlock_irqrestore(&jzchan->vchan.lock, flags);
561}
562
563static int jz4780_dma_terminate_all(struct dma_chan *chan)
564{
565 struct jz4780_dma_chan *jzchan = to_jz4780_dma_chan(chan);
566 struct jz4780_dma_dev *jzdma = jz4780_dma_chan_parent(jzchan);
567 unsigned long flags;
568 LIST_HEAD(head);
569
570 spin_lock_irqsave(&jzchan->vchan.lock, flags);
571
572
573 jz4780_dma_chn_writel(jzdma, jzchan->id, JZ_DMA_REG_DCS, 0);
574 if (jzchan->desc) {
575 vchan_terminate_vdesc(&jzchan->desc->vdesc);
576 jzchan->desc = NULL;
577 }
578
579 jz4780_dma_chan_disable(jzdma, jzchan->id);
580
581 vchan_get_all_descriptors(&jzchan->vchan, &head);
582
583 spin_unlock_irqrestore(&jzchan->vchan.lock, flags);
584
585 vchan_dma_desc_free_list(&jzchan->vchan, &head);
586 return 0;
587}
588
589static void jz4780_dma_synchronize(struct dma_chan *chan)
590{
591 struct jz4780_dma_chan *jzchan = to_jz4780_dma_chan(chan);
592 struct jz4780_dma_dev *jzdma = jz4780_dma_chan_parent(jzchan);
593
594 vchan_synchronize(&jzchan->vchan);
595 jz4780_dma_chan_disable(jzdma, jzchan->id);
596}
597
598static int jz4780_dma_config(struct dma_chan *chan,
599 struct dma_slave_config *config)
600{
601 struct jz4780_dma_chan *jzchan = to_jz4780_dma_chan(chan);
602
603 if ((config->src_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES)
604 || (config->dst_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES))
605 return -EINVAL;
606
607
608 memcpy(&jzchan->config, config, sizeof(jzchan->config));
609
610 return 0;
611}
612
613static size_t jz4780_dma_desc_residue(struct jz4780_dma_chan *jzchan,
614 struct jz4780_dma_desc *desc, unsigned int next_sg)
615{
616 struct jz4780_dma_dev *jzdma = jz4780_dma_chan_parent(jzchan);
617 unsigned int count = 0;
618 unsigned int i;
619
620 for (i = next_sg; i < desc->count; i++)
621 count += desc->desc[i].dtc & GENMASK(23, 0);
622
623 if (next_sg != 0)
624 count += jz4780_dma_chn_readl(jzdma, jzchan->id,
625 JZ_DMA_REG_DTC);
626
627 return count << jzchan->transfer_shift;
628}
629
630static enum dma_status jz4780_dma_tx_status(struct dma_chan *chan,
631 dma_cookie_t cookie, struct dma_tx_state *txstate)
632{
633 struct jz4780_dma_chan *jzchan = to_jz4780_dma_chan(chan);
634 struct virt_dma_desc *vdesc;
635 enum dma_status status;
636 unsigned long flags;
637 unsigned long residue = 0;
638
639 status = dma_cookie_status(chan, cookie, txstate);
640 if ((status == DMA_COMPLETE) || (txstate == NULL))
641 return status;
642
643 spin_lock_irqsave(&jzchan->vchan.lock, flags);
644
645 vdesc = vchan_find_desc(&jzchan->vchan, cookie);
646 if (vdesc) {
647
648 residue = jz4780_dma_desc_residue(jzchan,
649 to_jz4780_dma_desc(vdesc), 0);
650 } else if (cookie == jzchan->desc->vdesc.tx.cookie) {
651 residue = jz4780_dma_desc_residue(jzchan, jzchan->desc,
652 jzchan->curr_hwdesc + 1);
653 }
654 dma_set_residue(txstate, residue);
655
656 if (vdesc && jzchan->desc && vdesc == &jzchan->desc->vdesc
657 && jzchan->desc->status & (JZ_DMA_DCS_AR | JZ_DMA_DCS_HLT))
658 status = DMA_ERROR;
659
660 spin_unlock_irqrestore(&jzchan->vchan.lock, flags);
661 return status;
662}
663
664static bool jz4780_dma_chan_irq(struct jz4780_dma_dev *jzdma,
665 struct jz4780_dma_chan *jzchan)
666{
667 uint32_t dcs;
668 bool ack = true;
669
670 spin_lock(&jzchan->vchan.lock);
671
672 dcs = jz4780_dma_chn_readl(jzdma, jzchan->id, JZ_DMA_REG_DCS);
673 jz4780_dma_chn_writel(jzdma, jzchan->id, JZ_DMA_REG_DCS, 0);
674
675 if (dcs & JZ_DMA_DCS_AR) {
676 dev_warn(&jzchan->vchan.chan.dev->device,
677 "address error (DCS=0x%x)\n", dcs);
678 }
679
680 if (dcs & JZ_DMA_DCS_HLT) {
681 dev_warn(&jzchan->vchan.chan.dev->device,
682 "channel halt (DCS=0x%x)\n", dcs);
683 }
684
685 if (jzchan->desc) {
686 jzchan->desc->status = dcs;
687
688 if ((dcs & (JZ_DMA_DCS_AR | JZ_DMA_DCS_HLT)) == 0) {
689 if (jzchan->desc->type == DMA_CYCLIC) {
690 vchan_cyclic_callback(&jzchan->desc->vdesc);
691
692 jz4780_dma_begin(jzchan);
693 } else if (dcs & JZ_DMA_DCS_TT) {
694 vchan_cookie_complete(&jzchan->desc->vdesc);
695 jzchan->desc = NULL;
696
697 jz4780_dma_begin(jzchan);
698 } else {
699
700 ack = false;
701 jz4780_dma_chn_writel(jzdma, jzchan->id,
702 JZ_DMA_REG_DCS,
703 JZ_DMA_DCS_CTE);
704 }
705 }
706 } else {
707 dev_err(&jzchan->vchan.chan.dev->device,
708 "channel IRQ with no active transfer\n");
709 }
710
711 spin_unlock(&jzchan->vchan.lock);
712
713 return ack;
714}
715
716static irqreturn_t jz4780_dma_irq_handler(int irq, void *data)
717{
718 struct jz4780_dma_dev *jzdma = data;
719 unsigned int nb_channels = jzdma->soc_data->nb_channels;
720 unsigned long pending;
721 uint32_t dmac;
722 int i;
723
724 pending = jz4780_dma_ctrl_readl(jzdma, JZ_DMA_REG_DIRQP);
725
726 for_each_set_bit(i, &pending, nb_channels) {
727 if (jz4780_dma_chan_irq(jzdma, &jzdma->chan[i]))
728 pending &= ~BIT(i);
729 }
730
731
732 dmac = jz4780_dma_ctrl_readl(jzdma, JZ_DMA_REG_DMAC);
733 dmac &= ~(JZ_DMA_DMAC_HLT | JZ_DMA_DMAC_AR);
734 jz4780_dma_ctrl_writel(jzdma, JZ_DMA_REG_DMAC, dmac);
735
736
737 jz4780_dma_ctrl_writel(jzdma, JZ_DMA_REG_DIRQP, pending);
738
739 return IRQ_HANDLED;
740}
741
742static int jz4780_dma_alloc_chan_resources(struct dma_chan *chan)
743{
744 struct jz4780_dma_chan *jzchan = to_jz4780_dma_chan(chan);
745
746 jzchan->desc_pool = dma_pool_create(dev_name(&chan->dev->device),
747 chan->device->dev,
748 JZ_DMA_DESC_BLOCK_SIZE,
749 PAGE_SIZE, 0);
750 if (!jzchan->desc_pool) {
751 dev_err(&chan->dev->device,
752 "failed to allocate descriptor pool\n");
753 return -ENOMEM;
754 }
755
756 return 0;
757}
758
759static void jz4780_dma_free_chan_resources(struct dma_chan *chan)
760{
761 struct jz4780_dma_chan *jzchan = to_jz4780_dma_chan(chan);
762
763 vchan_free_chan_resources(&jzchan->vchan);
764 dma_pool_destroy(jzchan->desc_pool);
765 jzchan->desc_pool = NULL;
766}
767
768static bool jz4780_dma_filter_fn(struct dma_chan *chan, void *param)
769{
770 struct jz4780_dma_chan *jzchan = to_jz4780_dma_chan(chan);
771 struct jz4780_dma_dev *jzdma = jz4780_dma_chan_parent(jzchan);
772 struct jz4780_dma_filter_data *data = param;
773
774
775 if (data->channel > -1) {
776 if (data->channel != jzchan->id)
777 return false;
778 } else if (jzdma->chan_reserved & BIT(jzchan->id)) {
779 return false;
780 }
781
782 jzchan->transfer_type = data->transfer_type;
783
784 return true;
785}
786
787static struct dma_chan *jz4780_of_dma_xlate(struct of_phandle_args *dma_spec,
788 struct of_dma *ofdma)
789{
790 struct jz4780_dma_dev *jzdma = ofdma->of_dma_data;
791 dma_cap_mask_t mask = jzdma->dma_device.cap_mask;
792 struct jz4780_dma_filter_data data;
793
794 if (dma_spec->args_count != 2)
795 return NULL;
796
797 data.transfer_type = dma_spec->args[0];
798 data.channel = dma_spec->args[1];
799
800 if (data.channel > -1) {
801 if (data.channel >= jzdma->soc_data->nb_channels) {
802 dev_err(jzdma->dma_device.dev,
803 "device requested non-existent channel %u\n",
804 data.channel);
805 return NULL;
806 }
807
808
809 if (!(jzdma->chan_reserved & BIT(data.channel))) {
810 dev_err(jzdma->dma_device.dev,
811 "device requested unreserved channel %u\n",
812 data.channel);
813 return NULL;
814 }
815
816 jzdma->chan[data.channel].transfer_type = data.transfer_type;
817
818 return dma_get_slave_channel(
819 &jzdma->chan[data.channel].vchan.chan);
820 } else {
821 return __dma_request_channel(&mask, jz4780_dma_filter_fn, &data,
822 ofdma->of_node);
823 }
824}
825
826static int jz4780_dma_probe(struct platform_device *pdev)
827{
828 struct device *dev = &pdev->dev;
829 const struct jz4780_dma_soc_data *soc_data;
830 struct jz4780_dma_dev *jzdma;
831 struct jz4780_dma_chan *jzchan;
832 struct dma_device *dd;
833 struct resource *res;
834 int i, ret;
835
836 if (!dev->of_node) {
837 dev_err(dev, "This driver must be probed from devicetree\n");
838 return -EINVAL;
839 }
840
841 soc_data = device_get_match_data(dev);
842 if (!soc_data)
843 return -EINVAL;
844
845 jzdma = devm_kzalloc(dev, struct_size(jzdma, chan,
846 soc_data->nb_channels), GFP_KERNEL);
847 if (!jzdma)
848 return -ENOMEM;
849
850 jzdma->soc_data = soc_data;
851 platform_set_drvdata(pdev, jzdma);
852
853 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
854 if (!res) {
855 dev_err(dev, "failed to get I/O memory\n");
856 return -EINVAL;
857 }
858
859 jzdma->chn_base = devm_ioremap_resource(dev, res);
860 if (IS_ERR(jzdma->chn_base))
861 return PTR_ERR(jzdma->chn_base);
862
863 res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
864 if (res) {
865 jzdma->ctrl_base = devm_ioremap_resource(dev, res);
866 if (IS_ERR(jzdma->ctrl_base))
867 return PTR_ERR(jzdma->ctrl_base);
868 } else if (soc_data->flags & JZ_SOC_DATA_ALLOW_LEGACY_DT) {
869
870
871
872
873
874 jzdma->ctrl_base = jzdma->chn_base + JZ4780_DMA_CTRL_OFFSET;
875 } else {
876 dev_err(dev, "failed to get I/O memory\n");
877 return -EINVAL;
878 }
879
880 ret = platform_get_irq(pdev, 0);
881 if (ret < 0) {
882 dev_err(dev, "failed to get IRQ: %d\n", ret);
883 return ret;
884 }
885
886 jzdma->irq = ret;
887
888 ret = request_irq(jzdma->irq, jz4780_dma_irq_handler, 0, dev_name(dev),
889 jzdma);
890 if (ret) {
891 dev_err(dev, "failed to request IRQ %u!\n", jzdma->irq);
892 return ret;
893 }
894
895 jzdma->clk = devm_clk_get(dev, NULL);
896 if (IS_ERR(jzdma->clk)) {
897 dev_err(dev, "failed to get clock\n");
898 ret = PTR_ERR(jzdma->clk);
899 goto err_free_irq;
900 }
901
902 clk_prepare_enable(jzdma->clk);
903
904
905 of_property_read_u32_index(dev->of_node, "ingenic,reserved-channels",
906 0, &jzdma->chan_reserved);
907
908 dd = &jzdma->dma_device;
909
910 dma_cap_set(DMA_MEMCPY, dd->cap_mask);
911 dma_cap_set(DMA_SLAVE, dd->cap_mask);
912 dma_cap_set(DMA_CYCLIC, dd->cap_mask);
913
914 dd->dev = dev;
915 dd->copy_align = DMAENGINE_ALIGN_4_BYTES;
916 dd->device_alloc_chan_resources = jz4780_dma_alloc_chan_resources;
917 dd->device_free_chan_resources = jz4780_dma_free_chan_resources;
918 dd->device_prep_slave_sg = jz4780_dma_prep_slave_sg;
919 dd->device_prep_dma_cyclic = jz4780_dma_prep_dma_cyclic;
920 dd->device_prep_dma_memcpy = jz4780_dma_prep_dma_memcpy;
921 dd->device_config = jz4780_dma_config;
922 dd->device_terminate_all = jz4780_dma_terminate_all;
923 dd->device_synchronize = jz4780_dma_synchronize;
924 dd->device_tx_status = jz4780_dma_tx_status;
925 dd->device_issue_pending = jz4780_dma_issue_pending;
926 dd->src_addr_widths = JZ_DMA_BUSWIDTHS;
927 dd->dst_addr_widths = JZ_DMA_BUSWIDTHS;
928 dd->directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
929 dd->residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
930
931
932
933
934
935
936 jz4780_dma_ctrl_writel(jzdma, JZ_DMA_REG_DMAC, JZ_DMA_DMAC_DMAE |
937 JZ_DMA_DMAC_FAIC | JZ_DMA_DMAC_FMSC);
938
939 if (soc_data->flags & JZ_SOC_DATA_PROGRAMMABLE_DMA)
940 jz4780_dma_ctrl_writel(jzdma, JZ_DMA_REG_DMACP, 0);
941
942 INIT_LIST_HEAD(&dd->channels);
943
944 for (i = 0; i < soc_data->nb_channels; i++) {
945 jzchan = &jzdma->chan[i];
946 jzchan->id = i;
947
948 vchan_init(&jzchan->vchan, dd);
949 jzchan->vchan.desc_free = jz4780_dma_desc_free;
950 }
951
952 ret = dmaenginem_async_device_register(dd);
953 if (ret) {
954 dev_err(dev, "failed to register device\n");
955 goto err_disable_clk;
956 }
957
958
959 ret = of_dma_controller_register(dev->of_node, jz4780_of_dma_xlate,
960 jzdma);
961 if (ret) {
962 dev_err(dev, "failed to register OF DMA controller\n");
963 goto err_disable_clk;
964 }
965
966 dev_info(dev, "JZ4780 DMA controller initialised\n");
967 return 0;
968
969err_disable_clk:
970 clk_disable_unprepare(jzdma->clk);
971
972err_free_irq:
973 free_irq(jzdma->irq, jzdma);
974 return ret;
975}
976
977static int jz4780_dma_remove(struct platform_device *pdev)
978{
979 struct jz4780_dma_dev *jzdma = platform_get_drvdata(pdev);
980 int i;
981
982 of_dma_controller_free(pdev->dev.of_node);
983
984 free_irq(jzdma->irq, jzdma);
985
986 for (i = 0; i < jzdma->soc_data->nb_channels; i++)
987 tasklet_kill(&jzdma->chan[i].vchan.task);
988
989 return 0;
990}
991
992static const struct jz4780_dma_soc_data jz4740_dma_soc_data = {
993 .nb_channels = 6,
994 .transfer_ord_max = 5,
995};
996
997static const struct jz4780_dma_soc_data jz4725b_dma_soc_data = {
998 .nb_channels = 6,
999 .transfer_ord_max = 5,
1000 .flags = JZ_SOC_DATA_PER_CHAN_PM | JZ_SOC_DATA_NO_DCKES_DCKEC,
1001};
1002
1003static const struct jz4780_dma_soc_data jz4770_dma_soc_data = {
1004 .nb_channels = 6,
1005 .transfer_ord_max = 6,
1006 .flags = JZ_SOC_DATA_PER_CHAN_PM,
1007};
1008
1009static const struct jz4780_dma_soc_data jz4780_dma_soc_data = {
1010 .nb_channels = 32,
1011 .transfer_ord_max = 7,
1012 .flags = JZ_SOC_DATA_ALLOW_LEGACY_DT | JZ_SOC_DATA_PROGRAMMABLE_DMA,
1013};
1014
1015static const struct of_device_id jz4780_dma_dt_match[] = {
1016 { .compatible = "ingenic,jz4740-dma", .data = &jz4740_dma_soc_data },
1017 { .compatible = "ingenic,jz4725b-dma", .data = &jz4725b_dma_soc_data },
1018 { .compatible = "ingenic,jz4770-dma", .data = &jz4770_dma_soc_data },
1019 { .compatible = "ingenic,jz4780-dma", .data = &jz4780_dma_soc_data },
1020 {},
1021};
1022MODULE_DEVICE_TABLE(of, jz4780_dma_dt_match);
1023
1024static struct platform_driver jz4780_dma_driver = {
1025 .probe = jz4780_dma_probe,
1026 .remove = jz4780_dma_remove,
1027 .driver = {
1028 .name = "jz4780-dma",
1029 .of_match_table = of_match_ptr(jz4780_dma_dt_match),
1030 },
1031};
1032
1033static int __init jz4780_dma_init(void)
1034{
1035 return platform_driver_register(&jz4780_dma_driver);
1036}
1037subsys_initcall(jz4780_dma_init);
1038
1039static void __exit jz4780_dma_exit(void)
1040{
1041 platform_driver_unregister(&jz4780_dma_driver);
1042}
1043module_exit(jz4780_dma_exit);
1044
1045MODULE_AUTHOR("Alex Smith <alex@alex-smith.me.uk>");
1046MODULE_DESCRIPTION("Ingenic JZ4780 DMA controller driver");
1047MODULE_LICENSE("GPL");
1048