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[media] s5p-cec: Fix memory allocation failure check
[linux/fpc-iii.git] / drivers / dma / sun6i-dma.c
blob3835fcde35456fb20e89e77d5b02644b98df4df8
1 /*
2 * Copyright (C) 2013-2014 Allwinner Tech Co., Ltd
3 * Author: Sugar <shuge@allwinnertech.com>
4 *
5 * Copyright (C) 2014 Maxime Ripard
6 * Maxime Ripard <maxime.ripard@free-electrons.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 */
13
14 #include <linux/clk.h>
15 #include <linux/delay.h>
16 #include <linux/dmaengine.h>
17 #include <linux/dmapool.h>
18 #include <linux/interrupt.h>
19 #include <linux/module.h>
20 #include <linux/of_dma.h>
21 #include <linux/of_device.h>
22 #include <linux/platform_device.h>
23 #include <linux/reset.h>
24 #include <linux/slab.h>
25 #include <linux/types.h>
26
27 #include "virt-dma.h"
28
29 /*
30 * Common registers
31 */
32 #define DMA_IRQ_EN(x) ((x) * 0x04)
33 #define DMA_IRQ_HALF BIT(0)
34 #define DMA_IRQ_PKG BIT(1)
35 #define DMA_IRQ_QUEUE BIT(2)
36
37 #define DMA_IRQ_CHAN_NR 8
38 #define DMA_IRQ_CHAN_WIDTH 4
39
40
41 #define DMA_IRQ_STAT(x) ((x) * 0x04 + 0x10)
42
43 #define DMA_STAT 0x30
44
45 /*
46 * sun8i specific registers
47 */
48 #define SUN8I_DMA_GATE 0x20
49 #define SUN8I_DMA_GATE_ENABLE 0x4
50
51 /*
52 * Channels specific registers
53 */
54 #define DMA_CHAN_ENABLE 0x00
55 #define DMA_CHAN_ENABLE_START BIT(0)
56 #define DMA_CHAN_ENABLE_STOP 0
57
58 #define DMA_CHAN_PAUSE 0x04
59 #define DMA_CHAN_PAUSE_PAUSE BIT(1)
60 #define DMA_CHAN_PAUSE_RESUME 0
61
62 #define DMA_CHAN_LLI_ADDR 0x08
63
64 #define DMA_CHAN_CUR_CFG 0x0c
65 #define DMA_CHAN_CFG_SRC_DRQ(x) ((x) & 0x1f)
66 #define DMA_CHAN_CFG_SRC_IO_MODE BIT(5)
67 #define DMA_CHAN_CFG_SRC_LINEAR_MODE (0 << 5)
68 #define DMA_CHAN_CFG_SRC_BURST(x) (((x) & 0x3) << 7)
69 #define DMA_CHAN_CFG_SRC_WIDTH(x) (((x) & 0x3) << 9)
70
71 #define DMA_CHAN_CFG_DST_DRQ(x) (DMA_CHAN_CFG_SRC_DRQ(x) << 16)
72 #define DMA_CHAN_CFG_DST_IO_MODE (DMA_CHAN_CFG_SRC_IO_MODE << 16)
73 #define DMA_CHAN_CFG_DST_LINEAR_MODE (DMA_CHAN_CFG_SRC_LINEAR_MODE << 16)
74 #define DMA_CHAN_CFG_DST_BURST(x) (DMA_CHAN_CFG_SRC_BURST(x) << 16)
75 #define DMA_CHAN_CFG_DST_WIDTH(x) (DMA_CHAN_CFG_SRC_WIDTH(x) << 16)
76
77 #define DMA_CHAN_CUR_SRC 0x10
78
79 #define DMA_CHAN_CUR_DST 0x14
80
81 #define DMA_CHAN_CUR_CNT 0x18
82
83 #define DMA_CHAN_CUR_PARA 0x1c
84
85
86 /*
87 * Various hardware related defines
88 */
89 #define LLI_LAST_ITEM 0xfffff800
90 #define NORMAL_WAIT 8
91 #define DRQ_SDRAM 1
92
93 /*
94 * Hardware channels / ports representation
95 *
96 * The hardware is used in several SoCs, with differing numbers
97 * of channels and endpoints. This structure ties those numbers
98 * to a certain compatible string.
99 */
100 struct sun6i_dma_config {
101 u32 nr_max_channels;
102 u32 nr_max_requests;
103 u32 nr_max_vchans;
104 };
105
106 /*
107 * Hardware representation of the LLI
108 *
109 * The hardware will be fed the physical address of this structure,
110 * and read its content in order to start the transfer.
111 */
112 struct sun6i_dma_lli {
113 u32 cfg;
114 u32 src;
115 u32 dst;
116 u32 len;
117 u32 para;
118 u32 p_lli_next;
119
120 /*
121 * This field is not used by the DMA controller, but will be
122 * used by the CPU to go through the list (mostly for dumping
123 * or freeing it).
124 */
125 struct sun6i_dma_lli *v_lli_next;
126 };
127
128
129 struct sun6i_desc {
130 struct virt_dma_desc vd;
131 dma_addr_t p_lli;
132 struct sun6i_dma_lli *v_lli;
133 };
134
135 struct sun6i_pchan {
136 u32 idx;
137 void __iomem *base;
138 struct sun6i_vchan *vchan;
139 struct sun6i_desc *desc;
140 struct sun6i_desc *done;
141 };
142
143 struct sun6i_vchan {
144 struct virt_dma_chan vc;
145 struct list_head node;
146 struct dma_slave_config cfg;
147 struct sun6i_pchan *phy;
148 u8 port;
149 u8 irq_type;
150 bool cyclic;
151 };
152
153 struct sun6i_dma_dev {
154 struct dma_device slave;
155 void __iomem *base;
156 struct clk *clk;
157 int irq;
158 spinlock_t lock;
159 struct reset_control *rstc;
160 struct tasklet_struct task;
161 atomic_t tasklet_shutdown;
162 struct list_head pending;
163 struct dma_pool *pool;
164 struct sun6i_pchan *pchans;
165 struct sun6i_vchan *vchans;
166 const struct sun6i_dma_config *cfg;
167 };
168
169 static struct device *chan2dev(struct dma_chan *chan)
170 {
171 return &chan->dev->device;
172 }
173
174 static inline struct sun6i_dma_dev *to_sun6i_dma_dev(struct dma_device *d)
175 {
176 return container_of(d, struct sun6i_dma_dev, slave);
177 }
178
179 static inline struct sun6i_vchan *to_sun6i_vchan(struct dma_chan *chan)
180 {
181 return container_of(chan, struct sun6i_vchan, vc.chan);
182 }
183
184 static inline struct sun6i_desc *
185 to_sun6i_desc(struct dma_async_tx_descriptor *tx)
186 {
187 return container_of(tx, struct sun6i_desc, vd.tx);
188 }
189
190 static inline void sun6i_dma_dump_com_regs(struct sun6i_dma_dev *sdev)
191 {
192 dev_dbg(sdev->slave.dev, "Common register:\n"
193 "\tmask0(%04x): 0x%08x\n"
194 "\tmask1(%04x): 0x%08x\n"
195 "\tpend0(%04x): 0x%08x\n"
196 "\tpend1(%04x): 0x%08x\n"
197 "\tstats(%04x): 0x%08x\n",
198 DMA_IRQ_EN(0), readl(sdev->base + DMA_IRQ_EN(0)),
199 DMA_IRQ_EN(1), readl(sdev->base + DMA_IRQ_EN(1)),
200 DMA_IRQ_STAT(0), readl(sdev->base + DMA_IRQ_STAT(0)),
201 DMA_IRQ_STAT(1), readl(sdev->base + DMA_IRQ_STAT(1)),
202 DMA_STAT, readl(sdev->base + DMA_STAT));
203 }
204
205 static inline void sun6i_dma_dump_chan_regs(struct sun6i_dma_dev *sdev,
206 struct sun6i_pchan *pchan)
207 {
208 phys_addr_t reg = virt_to_phys(pchan->base);
209
210 dev_dbg(sdev->slave.dev, "Chan %d reg: %pa\n"
211 "\t___en(%04x): \t0x%08x\n"
212 "\tpause(%04x): \t0x%08x\n"
213 "\tstart(%04x): \t0x%08x\n"
214 "\t__cfg(%04x): \t0x%08x\n"
215 "\t__src(%04x): \t0x%08x\n"
216 "\t__dst(%04x): \t0x%08x\n"
217 "\tcount(%04x): \t0x%08x\n"
218 "\t_para(%04x): \t0x%08x\n\n",
219 pchan->idx, &reg,
220 DMA_CHAN_ENABLE,
221 readl(pchan->base + DMA_CHAN_ENABLE),
222 DMA_CHAN_PAUSE,
223 readl(pchan->base + DMA_CHAN_PAUSE),
224 DMA_CHAN_LLI_ADDR,
225 readl(pchan->base + DMA_CHAN_LLI_ADDR),
226 DMA_CHAN_CUR_CFG,
227 readl(pchan->base + DMA_CHAN_CUR_CFG),
228 DMA_CHAN_CUR_SRC,
229 readl(pchan->base + DMA_CHAN_CUR_SRC),
230 DMA_CHAN_CUR_DST,
231 readl(pchan->base + DMA_CHAN_CUR_DST),
232 DMA_CHAN_CUR_CNT,
233 readl(pchan->base + DMA_CHAN_CUR_CNT),
234 DMA_CHAN_CUR_PARA,
235 readl(pchan->base + DMA_CHAN_CUR_PARA));
236 }
237
238 static inline s8 convert_burst(u32 maxburst)
239 {
240 switch (maxburst) {
241 case 1:
242 return 0;
243 case 8:
244 return 2;
245 default:
246 return -EINVAL;
247 }
248 }
249
250 static inline s8 convert_buswidth(enum dma_slave_buswidth addr_width)
251 {
252 if ((addr_width < DMA_SLAVE_BUSWIDTH_1_BYTE) ||
253 (addr_width > DMA_SLAVE_BUSWIDTH_4_BYTES))
254 return -EINVAL;
255
256 return addr_width >> 1;
257 }
258
259 static size_t sun6i_get_chan_size(struct sun6i_pchan *pchan)
260 {
261 struct sun6i_desc *txd = pchan->desc;
262 struct sun6i_dma_lli *lli;
263 size_t bytes;
264 dma_addr_t pos;
265
266 pos = readl(pchan->base + DMA_CHAN_LLI_ADDR);
267 bytes = readl(pchan->base + DMA_CHAN_CUR_CNT);
268
269 if (pos == LLI_LAST_ITEM)
270 return bytes;
271
272 for (lli = txd->v_lli; lli; lli = lli->v_lli_next) {
273 if (lli->p_lli_next == pos) {
274 for (lli = lli->v_lli_next; lli; lli = lli->v_lli_next)
275 bytes += lli->len;
276 break;
277 }
278 }
279
280 return bytes;
281 }
282
283 static void *sun6i_dma_lli_add(struct sun6i_dma_lli *prev,
284 struct sun6i_dma_lli *next,
285 dma_addr_t next_phy,
286 struct sun6i_desc *txd)
287 {
288 if ((!prev && !txd) || !next)
289 return NULL;
290
291 if (!prev) {
292 txd->p_lli = next_phy;
293 txd->v_lli = next;
294 } else {
295 prev->p_lli_next = next_phy;
296 prev->v_lli_next = next;
297 }
298
299 next->p_lli_next = LLI_LAST_ITEM;
300 next->v_lli_next = NULL;
301
302 return next;
303 }
304
305 static inline void sun6i_dma_dump_lli(struct sun6i_vchan *vchan,
306 struct sun6i_dma_lli *lli)
307 {
308 phys_addr_t p_lli = virt_to_phys(lli);
309
310 dev_dbg(chan2dev(&vchan->vc.chan),
311 "\n\tdesc: p - %pa v - 0x%p\n"
312 "\t\tc - 0x%08x s - 0x%08x d - 0x%08x\n"
313 "\t\tl - 0x%08x p - 0x%08x n - 0x%08x\n",
314 &p_lli, lli,
315 lli->cfg, lli->src, lli->dst,
316 lli->len, lli->para, lli->p_lli_next);
317 }
318
319 static void sun6i_dma_free_desc(struct virt_dma_desc *vd)
320 {
321 struct sun6i_desc *txd = to_sun6i_desc(&vd->tx);
322 struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(vd->tx.chan->device);
323 struct sun6i_dma_lli *v_lli, *v_next;
324 dma_addr_t p_lli, p_next;
325
326 if (unlikely(!txd))
327 return;
328
329 p_lli = txd->p_lli;
330 v_lli = txd->v_lli;
331
332 while (v_lli) {
333 v_next = v_lli->v_lli_next;
334 p_next = v_lli->p_lli_next;
335
336 dma_pool_free(sdev->pool, v_lli, p_lli);
337
338 v_lli = v_next;
339 p_lli = p_next;
340 }
341
342 kfree(txd);
343 }
344
345 static int sun6i_dma_start_desc(struct sun6i_vchan *vchan)
346 {
347 struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(vchan->vc.chan.device);
348 struct virt_dma_desc *desc = vchan_next_desc(&vchan->vc);
349 struct sun6i_pchan *pchan = vchan->phy;
350 u32 irq_val, irq_reg, irq_offset;
351
352 if (!pchan)
353 return -EAGAIN;
354
355 if (!desc) {
356 pchan->desc = NULL;
357 pchan->done = NULL;
358 return -EAGAIN;
359 }
360
361 list_del(&desc->node);
362
363 pchan->desc = to_sun6i_desc(&desc->tx);
364 pchan->done = NULL;
365
366 sun6i_dma_dump_lli(vchan, pchan->desc->v_lli);
367
368 irq_reg = pchan->idx / DMA_IRQ_CHAN_NR;
369 irq_offset = pchan->idx % DMA_IRQ_CHAN_NR;
370
371 vchan->irq_type = vchan->cyclic ? DMA_IRQ_PKG : DMA_IRQ_QUEUE;
372
373 irq_val = readl(sdev->base + DMA_IRQ_EN(irq_reg));
374 irq_val &= ~((DMA_IRQ_HALF | DMA_IRQ_PKG | DMA_IRQ_QUEUE) <<
375 (irq_offset * DMA_IRQ_CHAN_WIDTH));
376 irq_val |= vchan->irq_type << (irq_offset * DMA_IRQ_CHAN_WIDTH);
377 writel(irq_val, sdev->base + DMA_IRQ_EN(irq_reg));
378
379 writel(pchan->desc->p_lli, pchan->base + DMA_CHAN_LLI_ADDR);
380 writel(DMA_CHAN_ENABLE_START, pchan->base + DMA_CHAN_ENABLE);
381
382 sun6i_dma_dump_com_regs(sdev);
383 sun6i_dma_dump_chan_regs(sdev, pchan);
384
385 return 0;
386 }
387
388 static void sun6i_dma_tasklet(unsigned long data)
389 {
390 struct sun6i_dma_dev *sdev = (struct sun6i_dma_dev *)data;
391 const struct sun6i_dma_config *cfg = sdev->cfg;
392 struct sun6i_vchan *vchan;
393 struct sun6i_pchan *pchan;
394 unsigned int pchan_alloc = 0;
395 unsigned int pchan_idx;
396
397 list_for_each_entry(vchan, &sdev->slave.channels, vc.chan.device_node) {
398 spin_lock_irq(&vchan->vc.lock);
399
400 pchan = vchan->phy;
401
402 if (pchan && pchan->done) {
403 if (sun6i_dma_start_desc(vchan)) {
404 /*
405 * No current txd associated with this channel
406 */
407 dev_dbg(sdev->slave.dev, "pchan %u: free\n",
408 pchan->idx);
409
410 /* Mark this channel free */
411 vchan->phy = NULL;
412 pchan->vchan = NULL;
413 }
414 }
415 spin_unlock_irq(&vchan->vc.lock);
416 }
417
418 spin_lock_irq(&sdev->lock);
419 for (pchan_idx = 0; pchan_idx < cfg->nr_max_channels; pchan_idx++) {
420 pchan = &sdev->pchans[pchan_idx];
421
422 if (pchan->vchan || list_empty(&sdev->pending))
423 continue;
424
425 vchan = list_first_entry(&sdev->pending,
426 struct sun6i_vchan, node);
427
428 /* Remove from pending channels */
429 list_del_init(&vchan->node);
430 pchan_alloc |= BIT(pchan_idx);
431
432 /* Mark this channel allocated */
433 pchan->vchan = vchan;
434 vchan->phy = pchan;
435 dev_dbg(sdev->slave.dev, "pchan %u: alloc vchan %p\n",
436 pchan->idx, &vchan->vc);
437 }
438 spin_unlock_irq(&sdev->lock);
439
440 for (pchan_idx = 0; pchan_idx < cfg->nr_max_channels; pchan_idx++) {
441 if (!(pchan_alloc & BIT(pchan_idx)))
442 continue;
443
444 pchan = sdev->pchans + pchan_idx;
445 vchan = pchan->vchan;
446 if (vchan) {
447 spin_lock_irq(&vchan->vc.lock);
448 sun6i_dma_start_desc(vchan);
449 spin_unlock_irq(&vchan->vc.lock);
450 }
451 }
452 }
453
454 static irqreturn_t sun6i_dma_interrupt(int irq, void *dev_id)
455 {
456 struct sun6i_dma_dev *sdev = dev_id;
457 struct sun6i_vchan *vchan;
458 struct sun6i_pchan *pchan;
459 int i, j, ret = IRQ_NONE;
460 u32 status;
461
462 for (i = 0; i < sdev->cfg->nr_max_channels / DMA_IRQ_CHAN_NR; i++) {
463 status = readl(sdev->base + DMA_IRQ_STAT(i));
464 if (!status)
465 continue;
466
467 dev_dbg(sdev->slave.dev, "DMA irq status %s: 0x%x\n",
468 i ? "high" : "low", status);
469
470 writel(status, sdev->base + DMA_IRQ_STAT(i));
471
472 for (j = 0; (j < DMA_IRQ_CHAN_NR) && status; j++) {
473 pchan = sdev->pchans + j;
474 vchan = pchan->vchan;
475 if (vchan && (status & vchan->irq_type)) {
476 if (vchan->cyclic) {
477 vchan_cyclic_callback(&pchan->desc->vd);
478 } else {
479 spin_lock(&vchan->vc.lock);
480 vchan_cookie_complete(&pchan->desc->vd);
481 pchan->done = pchan->desc;
482 spin_unlock(&vchan->vc.lock);
483 }
484 }
485
486 status = status >> DMA_IRQ_CHAN_WIDTH;
487 }
488
489 if (!atomic_read(&sdev->tasklet_shutdown))
490 tasklet_schedule(&sdev->task);
491 ret = IRQ_HANDLED;
492 }
493
494 return ret;
495 }
496
497 static int set_config(struct sun6i_dma_dev *sdev,
498 struct dma_slave_config *sconfig,
499 enum dma_transfer_direction direction,
500 u32 *p_cfg)
501 {
502 s8 src_width, dst_width, src_burst, dst_burst;
503
504 switch (direction) {
505 case DMA_MEM_TO_DEV:
506 src_burst = convert_burst(sconfig->src_maxburst ?
507 sconfig->src_maxburst : 8);
508 src_width = convert_buswidth(sconfig->src_addr_width !=
509 DMA_SLAVE_BUSWIDTH_UNDEFINED ?
510 sconfig->src_addr_width :
511 DMA_SLAVE_BUSWIDTH_4_BYTES);
512 dst_burst = convert_burst(sconfig->dst_maxburst);
513 dst_width = convert_buswidth(sconfig->dst_addr_width);
514 break;
515 case DMA_DEV_TO_MEM:
516 src_burst = convert_burst(sconfig->src_maxburst);
517 src_width = convert_buswidth(sconfig->src_addr_width);
518 dst_burst = convert_burst(sconfig->dst_maxburst ?
519 sconfig->dst_maxburst : 8);
520 dst_width = convert_buswidth(sconfig->dst_addr_width !=
521 DMA_SLAVE_BUSWIDTH_UNDEFINED ?
522 sconfig->dst_addr_width :
523 DMA_SLAVE_BUSWIDTH_4_BYTES);
524 break;
525 default:
526 return -EINVAL;
527 }
528
529 if (src_burst < 0)
530 return src_burst;
531 if (src_width < 0)
532 return src_width;
533 if (dst_burst < 0)
534 return dst_burst;
535 if (dst_width < 0)
536 return dst_width;
537
538 *p_cfg = DMA_CHAN_CFG_SRC_BURST(src_burst) |
539 DMA_CHAN_CFG_SRC_WIDTH(src_width) |
540 DMA_CHAN_CFG_DST_BURST(dst_burst) |
541 DMA_CHAN_CFG_DST_WIDTH(dst_width);
542
543 return 0;
544 }
545
546 static struct dma_async_tx_descriptor *sun6i_dma_prep_dma_memcpy(
547 struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
548 size_t len, unsigned long flags)
549 {
550 struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(chan->device);
551 struct sun6i_vchan *vchan = to_sun6i_vchan(chan);
552 struct sun6i_dma_lli *v_lli;
553 struct sun6i_desc *txd;
554 dma_addr_t p_lli;
555 s8 burst, width;
556
557 dev_dbg(chan2dev(chan),
558 "%s; chan: %d, dest: %pad, src: %pad, len: %zu. flags: 0x%08lx\n",
559 __func__, vchan->vc.chan.chan_id, &dest, &src, len, flags);
560
561 if (!len)
562 return NULL;
563
564 txd = kzalloc(sizeof(*txd), GFP_NOWAIT);
565 if (!txd)
566 return NULL;
567
568 v_lli = dma_pool_alloc(sdev->pool, GFP_NOWAIT, &p_lli);
569 if (!v_lli) {
570 dev_err(sdev->slave.dev, "Failed to alloc lli memory\n");
571 goto err_txd_free;
572 }
573
574 v_lli->src = src;
575 v_lli->dst = dest;
576 v_lli->len = len;
577 v_lli->para = NORMAL_WAIT;
578
579 burst = convert_burst(8);
580 width = convert_buswidth(DMA_SLAVE_BUSWIDTH_4_BYTES);
581 v_lli->cfg |= DMA_CHAN_CFG_SRC_DRQ(DRQ_SDRAM) |
582 DMA_CHAN_CFG_DST_DRQ(DRQ_SDRAM) |
583 DMA_CHAN_CFG_DST_LINEAR_MODE |
584 DMA_CHAN_CFG_SRC_LINEAR_MODE |
585 DMA_CHAN_CFG_SRC_BURST(burst) |
586 DMA_CHAN_CFG_SRC_WIDTH(width) |
587 DMA_CHAN_CFG_DST_BURST(burst) |
588 DMA_CHAN_CFG_DST_WIDTH(width);
589
590 sun6i_dma_lli_add(NULL, v_lli, p_lli, txd);
591
592 sun6i_dma_dump_lli(vchan, v_lli);
593
594 return vchan_tx_prep(&vchan->vc, &txd->vd, flags);
595
596 err_txd_free:
597 kfree(txd);
598 return NULL;
599 }
600
601 static struct dma_async_tx_descriptor *sun6i_dma_prep_slave_sg(
602 struct dma_chan *chan, struct scatterlist *sgl,
603 unsigned int sg_len, enum dma_transfer_direction dir,
604 unsigned long flags, void *context)
605 {
606 struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(chan->device);
607 struct sun6i_vchan *vchan = to_sun6i_vchan(chan);
608 struct dma_slave_config *sconfig = &vchan->cfg;
609 struct sun6i_dma_lli *v_lli, *prev = NULL;
610 struct sun6i_desc *txd;
611 struct scatterlist *sg;
612 dma_addr_t p_lli;
613 u32 lli_cfg;
614 int i, ret;
615
616 if (!sgl)
617 return NULL;
618
619 ret = set_config(sdev, sconfig, dir, &lli_cfg);
620 if (ret) {
621 dev_err(chan2dev(chan), "Invalid DMA configuration\n");
622 return NULL;
623 }
624
625 txd = kzalloc(sizeof(*txd), GFP_NOWAIT);
626 if (!txd)
627 return NULL;
628
629 for_each_sg(sgl, sg, sg_len, i) {
630 v_lli = dma_pool_alloc(sdev->pool, GFP_NOWAIT, &p_lli);
631 if (!v_lli)
632 goto err_lli_free;
633
634 v_lli->len = sg_dma_len(sg);
635 v_lli->para = NORMAL_WAIT;
636
637 if (dir == DMA_MEM_TO_DEV) {
638 v_lli->src = sg_dma_address(sg);
639 v_lli->dst = sconfig->dst_addr;
640 v_lli->cfg = lli_cfg |
641 DMA_CHAN_CFG_DST_IO_MODE |
642 DMA_CHAN_CFG_SRC_LINEAR_MODE |
643 DMA_CHAN_CFG_SRC_DRQ(DRQ_SDRAM) |
644 DMA_CHAN_CFG_DST_DRQ(vchan->port);
645
646 dev_dbg(chan2dev(chan),
647 "%s; chan: %d, dest: %pad, src: %pad, len: %u. flags: 0x%08lx\n",
648 __func__, vchan->vc.chan.chan_id,
649 &sconfig->dst_addr, &sg_dma_address(sg),
650 sg_dma_len(sg), flags);
651
652 } else {
653 v_lli->src = sconfig->src_addr;
654 v_lli->dst = sg_dma_address(sg);
655 v_lli->cfg = lli_cfg |
656 DMA_CHAN_CFG_DST_LINEAR_MODE |
657 DMA_CHAN_CFG_SRC_IO_MODE |
658 DMA_CHAN_CFG_DST_DRQ(DRQ_SDRAM) |
659 DMA_CHAN_CFG_SRC_DRQ(vchan->port);
660
661 dev_dbg(chan2dev(chan),
662 "%s; chan: %d, dest: %pad, src: %pad, len: %u. flags: 0x%08lx\n",
663 __func__, vchan->vc.chan.chan_id,
664 &sg_dma_address(sg), &sconfig->src_addr,
665 sg_dma_len(sg), flags);
666 }
667
668 prev = sun6i_dma_lli_add(prev, v_lli, p_lli, txd);
669 }
670
671 dev_dbg(chan2dev(chan), "First: %pad\n", &txd->p_lli);
672 for (prev = txd->v_lli; prev; prev = prev->v_lli_next)
673 sun6i_dma_dump_lli(vchan, prev);
674
675 return vchan_tx_prep(&vchan->vc, &txd->vd, flags);
676
677 err_lli_free:
678 for (prev = txd->v_lli; prev; prev = prev->v_lli_next)
679 dma_pool_free(sdev->pool, prev, virt_to_phys(prev));
680 kfree(txd);
681 return NULL;
682 }
683
684 static struct dma_async_tx_descriptor *sun6i_dma_prep_dma_cyclic(
685 struct dma_chan *chan,
686 dma_addr_t buf_addr,
687 size_t buf_len,
688 size_t period_len,
689 enum dma_transfer_direction dir,
690 unsigned long flags)
691 {
692 struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(chan->device);
693 struct sun6i_vchan *vchan = to_sun6i_vchan(chan);
694 struct dma_slave_config *sconfig = &vchan->cfg;
695 struct sun6i_dma_lli *v_lli, *prev = NULL;
696 struct sun6i_desc *txd;
697 dma_addr_t p_lli;
698 u32 lli_cfg;
699 unsigned int i, periods = buf_len / period_len;
700 int ret;
701
702 ret = set_config(sdev, sconfig, dir, &lli_cfg);
703 if (ret) {
704 dev_err(chan2dev(chan), "Invalid DMA configuration\n");
705 return NULL;
706 }
707
708 txd = kzalloc(sizeof(*txd), GFP_NOWAIT);
709 if (!txd)
710 return NULL;
711
712 for (i = 0; i < periods; i++) {
713 v_lli = dma_pool_alloc(sdev->pool, GFP_NOWAIT, &p_lli);
714 if (!v_lli) {
715 dev_err(sdev->slave.dev, "Failed to alloc lli memory\n");
716 goto err_lli_free;
717 }
718
719 v_lli->len = period_len;
720 v_lli->para = NORMAL_WAIT;
721
722 if (dir == DMA_MEM_TO_DEV) {
723 v_lli->src = buf_addr + period_len * i;
724 v_lli->dst = sconfig->dst_addr;
725 v_lli->cfg = lli_cfg |
726 DMA_CHAN_CFG_DST_IO_MODE |
727 DMA_CHAN_CFG_SRC_LINEAR_MODE |
728 DMA_CHAN_CFG_SRC_DRQ(DRQ_SDRAM) |
729 DMA_CHAN_CFG_DST_DRQ(vchan->port);
730 } else {
731 v_lli->src = sconfig->src_addr;
732 v_lli->dst = buf_addr + period_len * i;
733 v_lli->cfg = lli_cfg |
734 DMA_CHAN_CFG_DST_LINEAR_MODE |
735 DMA_CHAN_CFG_SRC_IO_MODE |
736 DMA_CHAN_CFG_DST_DRQ(DRQ_SDRAM) |
737 DMA_CHAN_CFG_SRC_DRQ(vchan->port);
738 }
739
740 prev = sun6i_dma_lli_add(prev, v_lli, p_lli, txd);
741 }
742
743 prev->p_lli_next = txd->p_lli; /* cyclic list */
744
745 vchan->cyclic = true;
746
747 return vchan_tx_prep(&vchan->vc, &txd->vd, flags);
748
749 err_lli_free:
750 for (prev = txd->v_lli; prev; prev = prev->v_lli_next)
751 dma_pool_free(sdev->pool, prev, virt_to_phys(prev));
752 kfree(txd);
753 return NULL;
754 }
755
756 static int sun6i_dma_config(struct dma_chan *chan,
757 struct dma_slave_config *config)
758 {
759 struct sun6i_vchan *vchan = to_sun6i_vchan(chan);
760
761 memcpy(&vchan->cfg, config, sizeof(*config));
762
763 return 0;
764 }
765
766 static int sun6i_dma_pause(struct dma_chan *chan)
767 {
768 struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(chan->device);
769 struct sun6i_vchan *vchan = to_sun6i_vchan(chan);
770 struct sun6i_pchan *pchan = vchan->phy;
771
772 dev_dbg(chan2dev(chan), "vchan %p: pause\n", &vchan->vc);
773
774 if (pchan) {
775 writel(DMA_CHAN_PAUSE_PAUSE,
776 pchan->base + DMA_CHAN_PAUSE);
777 } else {
778 spin_lock(&sdev->lock);
779 list_del_init(&vchan->node);
780 spin_unlock(&sdev->lock);
781 }
782
783 return 0;
784 }
785
786 static int sun6i_dma_resume(struct dma_chan *chan)
787 {
788 struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(chan->device);
789 struct sun6i_vchan *vchan = to_sun6i_vchan(chan);
790 struct sun6i_pchan *pchan = vchan->phy;
791 unsigned long flags;
792
793 dev_dbg(chan2dev(chan), "vchan %p: resume\n", &vchan->vc);
794
795 spin_lock_irqsave(&vchan->vc.lock, flags);
796
797 if (pchan) {
798 writel(DMA_CHAN_PAUSE_RESUME,
799 pchan->base + DMA_CHAN_PAUSE);
800 } else if (!list_empty(&vchan->vc.desc_issued)) {
801 spin_lock(&sdev->lock);
802 list_add_tail(&vchan->node, &sdev->pending);
803 spin_unlock(&sdev->lock);
804 }
805
806 spin_unlock_irqrestore(&vchan->vc.lock, flags);
807
808 return 0;
809 }
810
811 static int sun6i_dma_terminate_all(struct dma_chan *chan)
812 {
813 struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(chan->device);
814 struct sun6i_vchan *vchan = to_sun6i_vchan(chan);
815 struct sun6i_pchan *pchan = vchan->phy;
816 unsigned long flags;
817 LIST_HEAD(head);
818
819 spin_lock(&sdev->lock);
820 list_del_init(&vchan->node);
821 spin_unlock(&sdev->lock);
822
823 spin_lock_irqsave(&vchan->vc.lock, flags);
824
825 if (vchan->cyclic) {
826 vchan->cyclic = false;
827 if (pchan && pchan->desc) {
828 struct virt_dma_desc *vd = &pchan->desc->vd;
829 struct virt_dma_chan *vc = &vchan->vc;
830
831 list_add_tail(&vd->node, &vc->desc_completed);
832 }
833 }
834
835 vchan_get_all_descriptors(&vchan->vc, &head);
836
837 if (pchan) {
838 writel(DMA_CHAN_ENABLE_STOP, pchan->base + DMA_CHAN_ENABLE);
839 writel(DMA_CHAN_PAUSE_RESUME, pchan->base + DMA_CHAN_PAUSE);
840
841 vchan->phy = NULL;
842 pchan->vchan = NULL;
843 pchan->desc = NULL;
844 pchan->done = NULL;
845 }
846
847 spin_unlock_irqrestore(&vchan->vc.lock, flags);
848
849 vchan_dma_desc_free_list(&vchan->vc, &head);
850
851 return 0;
852 }
853
854 static enum dma_status sun6i_dma_tx_status(struct dma_chan *chan,
855 dma_cookie_t cookie,
856 struct dma_tx_state *state)
857 {
858 struct sun6i_vchan *vchan = to_sun6i_vchan(chan);
859 struct sun6i_pchan *pchan = vchan->phy;
860 struct sun6i_dma_lli *lli;
861 struct virt_dma_desc *vd;
862 struct sun6i_desc *txd;
863 enum dma_status ret;
864 unsigned long flags;
865 size_t bytes = 0;
866
867 ret = dma_cookie_status(chan, cookie, state);
868 if (ret == DMA_COMPLETE || !state)
869 return ret;
870
871 spin_lock_irqsave(&vchan->vc.lock, flags);
872
873 vd = vchan_find_desc(&vchan->vc, cookie);
874 txd = to_sun6i_desc(&vd->tx);
875
876 if (vd) {
877 for (lli = txd->v_lli; lli != NULL; lli = lli->v_lli_next)
878 bytes += lli->len;
879 } else if (!pchan || !pchan->desc) {
880 bytes = 0;
881 } else {
882 bytes = sun6i_get_chan_size(pchan);
883 }
884
885 spin_unlock_irqrestore(&vchan->vc.lock, flags);
886
887 dma_set_residue(state, bytes);
888
889 return ret;
890 }
891
892 static void sun6i_dma_issue_pending(struct dma_chan *chan)
893 {
894 struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(chan->device);
895 struct sun6i_vchan *vchan = to_sun6i_vchan(chan);
896 unsigned long flags;
897
898 spin_lock_irqsave(&vchan->vc.lock, flags);
899
900 if (vchan_issue_pending(&vchan->vc)) {
901 spin_lock(&sdev->lock);
902
903 if (!vchan->phy && list_empty(&vchan->node)) {
904 list_add_tail(&vchan->node, &sdev->pending);
905 tasklet_schedule(&sdev->task);
906 dev_dbg(chan2dev(chan), "vchan %p: issued\n",
907 &vchan->vc);
908 }
909
910 spin_unlock(&sdev->lock);
911 } else {
912 dev_dbg(chan2dev(chan), "vchan %p: nothing to issue\n",
913 &vchan->vc);
914 }
915
916 spin_unlock_irqrestore(&vchan->vc.lock, flags);
917 }
918
919 static void sun6i_dma_free_chan_resources(struct dma_chan *chan)
920 {
921 struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(chan->device);
922 struct sun6i_vchan *vchan = to_sun6i_vchan(chan);
923 unsigned long flags;
924
925 spin_lock_irqsave(&sdev->lock, flags);
926 list_del_init(&vchan->node);
927 spin_unlock_irqrestore(&sdev->lock, flags);
928
929 vchan_free_chan_resources(&vchan->vc);
930 }
931
932 static struct dma_chan *sun6i_dma_of_xlate(struct of_phandle_args *dma_spec,
933 struct of_dma *ofdma)
934 {
935 struct sun6i_dma_dev *sdev = ofdma->of_dma_data;
936 struct sun6i_vchan *vchan;
937 struct dma_chan *chan;
938 u8 port = dma_spec->args[0];
939
940 if (port > sdev->cfg->nr_max_requests)
941 return NULL;
942
943 chan = dma_get_any_slave_channel(&sdev->slave);
944 if (!chan)
945 return NULL;
946
947 vchan = to_sun6i_vchan(chan);
948 vchan->port = port;
949
950 return chan;
951 }
952
953 static inline void sun6i_kill_tasklet(struct sun6i_dma_dev *sdev)
954 {
955 /* Disable all interrupts from DMA */
956 writel(0, sdev->base + DMA_IRQ_EN(0));
957 writel(0, sdev->base + DMA_IRQ_EN(1));
958
959 /* Prevent spurious interrupts from scheduling the tasklet */
960 atomic_inc(&sdev->tasklet_shutdown);
961
962 /* Make sure we won't have any further interrupts */
963 devm_free_irq(sdev->slave.dev, sdev->irq, sdev);
964
965 /* Actually prevent the tasklet from being scheduled */
966 tasklet_kill(&sdev->task);
967 }
968
969 static inline void sun6i_dma_free(struct sun6i_dma_dev *sdev)
970 {
971 int i;
972
973 for (i = 0; i < sdev->cfg->nr_max_vchans; i++) {
974 struct sun6i_vchan *vchan = &sdev->vchans[i];
975
976 list_del(&vchan->vc.chan.device_node);
977 tasklet_kill(&vchan->vc.task);
978 }
979 }
980
981 /*
982 * For A31:
983 *
984 * There's 16 physical channels that can work in parallel.
985 *
986 * However we have 30 different endpoints for our requests.
987 *
988 * Since the channels are able to handle only an unidirectional
989 * transfer, we need to allocate more virtual channels so that
990 * everyone can grab one channel.
991 *
992 * Some devices can't work in both direction (mostly because it
993 * wouldn't make sense), so we have a bit fewer virtual channels than
994 * 2 channels per endpoints.
995 */
996
997 static struct sun6i_dma_config sun6i_a31_dma_cfg = {
998 .nr_max_channels = 16,
999 .nr_max_requests = 30,
1000 .nr_max_vchans = 53,
1001 };
1002
1003 /*
1004 * The A23 only has 8 physical channels, a maximum DRQ port id of 24,
1005 * and a total of 37 usable source and destination endpoints.
1006 */
1007
1008 static struct sun6i_dma_config sun8i_a23_dma_cfg = {
1009 .nr_max_channels = 8,
1010 .nr_max_requests = 24,
1011 .nr_max_vchans = 37,
1012 };
1013
1014 /*
1015 * The H3 has 12 physical channels, a maximum DRQ port id of 27,
1016 * and a total of 34 usable source and destination endpoints.
1017 */
1018
1019 static struct sun6i_dma_config sun8i_h3_dma_cfg = {
1020 .nr_max_channels = 12,
1021 .nr_max_requests = 27,
1022 .nr_max_vchans = 34,
1023 };
1024
1025 static const struct of_device_id sun6i_dma_match[] = {
1026 { .compatible = "allwinner,sun6i-a31-dma", .data = &sun6i_a31_dma_cfg },
1027 { .compatible = "allwinner,sun8i-a23-dma", .data = &sun8i_a23_dma_cfg },
1028 { .compatible = "allwinner,sun8i-h3-dma", .data = &sun8i_h3_dma_cfg },
1029 { /* sentinel */ }
1030 };
1031 MODULE_DEVICE_TABLE(of, sun6i_dma_match);
1032
1033 static int sun6i_dma_probe(struct platform_device *pdev)
1034 {
1035 const struct of_device_id *device;
1036 struct sun6i_dma_dev *sdc;
1037 struct resource *res;
1038 int ret, i;
1039
1040 sdc = devm_kzalloc(&pdev->dev, sizeof(*sdc), GFP_KERNEL);
1041 if (!sdc)
1042 return -ENOMEM;
1043
1044 device = of_match_device(sun6i_dma_match, &pdev->dev);
1045 if (!device)
1046 return -ENODEV;
1047 sdc->cfg = device->data;
1048
1049 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1050 sdc->base = devm_ioremap_resource(&pdev->dev, res);
1051 if (IS_ERR(sdc->base))
1052 return PTR_ERR(sdc->base);
1053
1054 sdc->irq = platform_get_irq(pdev, 0);
1055 if (sdc->irq < 0) {
1056 dev_err(&pdev->dev, "Cannot claim IRQ\n");
1057 return sdc->irq;
1058 }
1059
1060 sdc->clk = devm_clk_get(&pdev->dev, NULL);
1061 if (IS_ERR(sdc->clk)) {
1062 dev_err(&pdev->dev, "No clock specified\n");
1063 return PTR_ERR(sdc->clk);
1064 }
1065
1066 sdc->rstc = devm_reset_control_get(&pdev->dev, NULL);
1067 if (IS_ERR(sdc->rstc)) {
1068 dev_err(&pdev->dev, "No reset controller specified\n");
1069 return PTR_ERR(sdc->rstc);
1070 }
1071
1072 sdc->pool = dmam_pool_create(dev_name(&pdev->dev), &pdev->dev,
1073 sizeof(struct sun6i_dma_lli), 4, 0);
1074 if (!sdc->pool) {
1075 dev_err(&pdev->dev, "No memory for descriptors dma pool\n");
1076 return -ENOMEM;
1077 }
1078
1079 platform_set_drvdata(pdev, sdc);
1080 INIT_LIST_HEAD(&sdc->pending);
1081 spin_lock_init(&sdc->lock);
1082
1083 dma_cap_set(DMA_PRIVATE, sdc->slave.cap_mask);
1084 dma_cap_set(DMA_MEMCPY, sdc->slave.cap_mask);
1085 dma_cap_set(DMA_SLAVE, sdc->slave.cap_mask);
1086 dma_cap_set(DMA_CYCLIC, sdc->slave.cap_mask);
1087
1088 INIT_LIST_HEAD(&sdc->slave.channels);
1089 sdc->slave.device_free_chan_resources = sun6i_dma_free_chan_resources;
1090 sdc->slave.device_tx_status = sun6i_dma_tx_status;
1091 sdc->slave.device_issue_pending = sun6i_dma_issue_pending;
1092 sdc->slave.device_prep_slave_sg = sun6i_dma_prep_slave_sg;
1093 sdc->slave.device_prep_dma_memcpy = sun6i_dma_prep_dma_memcpy;
1094 sdc->slave.device_prep_dma_cyclic = sun6i_dma_prep_dma_cyclic;
1095 sdc->slave.copy_align = DMAENGINE_ALIGN_4_BYTES;
1096 sdc->slave.device_config = sun6i_dma_config;
1097 sdc->slave.device_pause = sun6i_dma_pause;
1098 sdc->slave.device_resume = sun6i_dma_resume;
1099 sdc->slave.device_terminate_all = sun6i_dma_terminate_all;
1100 sdc->slave.src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
1101 BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
1102 BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
1103 sdc->slave.dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
1104 BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
1105 BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
1106 sdc->slave.directions = BIT(DMA_DEV_TO_MEM) |
1107 BIT(DMA_MEM_TO_DEV);
1108 sdc->slave.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
1109 sdc->slave.dev = &pdev->dev;
1110
1111 sdc->pchans = devm_kcalloc(&pdev->dev, sdc->cfg->nr_max_channels,
1112 sizeof(struct sun6i_pchan), GFP_KERNEL);
1113 if (!sdc->pchans)
1114 return -ENOMEM;
1115
1116 sdc->vchans = devm_kcalloc(&pdev->dev, sdc->cfg->nr_max_vchans,
1117 sizeof(struct sun6i_vchan), GFP_KERNEL);
1118 if (!sdc->vchans)
1119 return -ENOMEM;
1120
1121 tasklet_init(&sdc->task, sun6i_dma_tasklet, (unsigned long)sdc);
1122
1123 for (i = 0; i < sdc->cfg->nr_max_channels; i++) {
1124 struct sun6i_pchan *pchan = &sdc->pchans[i];
1125
1126 pchan->idx = i;
1127 pchan->base = sdc->base + 0x100 + i * 0x40;
1128 }
1129
1130 for (i = 0; i < sdc->cfg->nr_max_vchans; i++) {
1131 struct sun6i_vchan *vchan = &sdc->vchans[i];
1132
1133 INIT_LIST_HEAD(&vchan->node);
1134 vchan->vc.desc_free = sun6i_dma_free_desc;
1135 vchan_init(&vchan->vc, &sdc->slave);
1136 }
1137
1138 ret = reset_control_deassert(sdc->rstc);
1139 if (ret) {
1140 dev_err(&pdev->dev, "Couldn't deassert the device from reset\n");
1141 goto err_chan_free;
1142 }
1143
1144 ret = clk_prepare_enable(sdc->clk);
1145 if (ret) {
1146 dev_err(&pdev->dev, "Couldn't enable the clock\n");
1147 goto err_reset_assert;
1148 }
1149
1150 ret = devm_request_irq(&pdev->dev, sdc->irq, sun6i_dma_interrupt, 0,
1151 dev_name(&pdev->dev), sdc);
1152 if (ret) {
1153 dev_err(&pdev->dev, "Cannot request IRQ\n");
1154 goto err_clk_disable;
1155 }
1156
1157 ret = dma_async_device_register(&sdc->slave);
1158 if (ret) {
1159 dev_warn(&pdev->dev, "Failed to register DMA engine device\n");
1160 goto err_irq_disable;
1161 }
1162
1163 ret = of_dma_controller_register(pdev->dev.of_node, sun6i_dma_of_xlate,
1164 sdc);
1165 if (ret) {
1166 dev_err(&pdev->dev, "of_dma_controller_register failed\n");
1167 goto err_dma_unregister;
1168 }
1169
1170 /*
1171 * sun8i variant requires us to toggle a dma gating register,
1172 * as seen in Allwinner's SDK. This register is not documented
1173 * in the A23 user manual.
1174 */
1175 if (of_device_is_compatible(pdev->dev.of_node,
1176 "allwinner,sun8i-a23-dma"))
1177 writel(SUN8I_DMA_GATE_ENABLE, sdc->base + SUN8I_DMA_GATE);
1178
1179 return 0;
1180
1181 err_dma_unregister:
1182 dma_async_device_unregister(&sdc->slave);
1183 err_irq_disable:
1184 sun6i_kill_tasklet(sdc);
1185 err_clk_disable:
1186 clk_disable_unprepare(sdc->clk);
1187 err_reset_assert:
1188 reset_control_assert(sdc->rstc);
1189 err_chan_free:
1190 sun6i_dma_free(sdc);
1191 return ret;
1192 }
1193
1194 static int sun6i_dma_remove(struct platform_device *pdev)
1195 {
1196 struct sun6i_dma_dev *sdc = platform_get_drvdata(pdev);
1197
1198 of_dma_controller_free(pdev->dev.of_node);
1199 dma_async_device_unregister(&sdc->slave);
1200
1201 sun6i_kill_tasklet(sdc);
1202
1203 clk_disable_unprepare(sdc->clk);
1204 reset_control_assert(sdc->rstc);
1205
1206 sun6i_dma_free(sdc);
1207
1208 return 0;
1209 }
1210
1211 static struct platform_driver sun6i_dma_driver = {
1212 .probe = sun6i_dma_probe,
1213 .remove = sun6i_dma_remove,
1214 .driver = {
1215 .name = "sun6i-dma",
1216 .of_match_table = sun6i_dma_match,
1217 },
1218 };
1219 module_platform_driver(sun6i_dma_driver);
1220
1221 MODULE_DESCRIPTION("Allwinner A31 DMA Controller Driver");
1222 MODULE_AUTHOR("Sugar <shuge@allwinnertech.com>");
1223 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
1224 MODULE_LICENSE("GPL");
Linux with added FPC-III support