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of: MSI: Simplify irqdomain lookup
[linux/fpc-iii.git] / drivers / dma / k3dma.c
blob1ba2fd73852d273ccf9f8df0e6e6cfc0144fb90d
1 /*
2 * Copyright (c) 2013 Linaro Ltd.
3 * Copyright (c) 2013 Hisilicon Limited.
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 */
9 #include <linux/sched.h>
10 #include <linux/device.h>
11 #include <linux/dmaengine.h>
12 #include <linux/init.h>
13 #include <linux/interrupt.h>
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/platform_device.h>
17 #include <linux/slab.h>
18 #include <linux/spinlock.h>
19 #include <linux/of_device.h>
20 #include <linux/of.h>
21 #include <linux/clk.h>
22 #include <linux/of_dma.h>
23
24 #include "virt-dma.h"
25
26 #define DRIVER_NAME "k3-dma"
27 #define DMA_MAX_SIZE 0x1ffc
28
29 #define INT_STAT 0x00
30 #define INT_TC1 0x04
31 #define INT_ERR1 0x0c
32 #define INT_ERR2 0x10
33 #define INT_TC1_MASK 0x18
34 #define INT_ERR1_MASK 0x20
35 #define INT_ERR2_MASK 0x24
36 #define INT_TC1_RAW 0x600
37 #define INT_ERR1_RAW 0x608
38 #define INT_ERR2_RAW 0x610
39 #define CH_PRI 0x688
40 #define CH_STAT 0x690
41 #define CX_CUR_CNT 0x704
42 #define CX_LLI 0x800
43 #define CX_CNT 0x810
44 #define CX_SRC 0x814
45 #define CX_DST 0x818
46 #define CX_CFG 0x81c
47 #define AXI_CFG 0x820
48 #define AXI_CFG_DEFAULT 0x201201
49
50 #define CX_LLI_CHAIN_EN 0x2
51 #define CX_CFG_EN 0x1
52 #define CX_CFG_MEM2PER (0x1 << 2)
53 #define CX_CFG_PER2MEM (0x2 << 2)
54 #define CX_CFG_SRCINCR (0x1 << 31)
55 #define CX_CFG_DSTINCR (0x1 << 30)
56
57 struct k3_desc_hw {
58 u32 lli;
59 u32 reserved[3];
60 u32 count;
61 u32 saddr;
62 u32 daddr;
63 u32 config;
64 } __aligned(32);
65
66 struct k3_dma_desc_sw {
67 struct virt_dma_desc vd;
68 dma_addr_t desc_hw_lli;
69 size_t desc_num;
70 size_t size;
71 struct k3_desc_hw desc_hw[0];
72 };
73
74 struct k3_dma_phy;
75
76 struct k3_dma_chan {
77 u32 ccfg;
78 struct virt_dma_chan vc;
79 struct k3_dma_phy *phy;
80 struct list_head node;
81 enum dma_transfer_direction dir;
82 dma_addr_t dev_addr;
83 enum dma_status status;
84 };
85
86 struct k3_dma_phy {
87 u32 idx;
88 void __iomem *base;
89 struct k3_dma_chan *vchan;
90 struct k3_dma_desc_sw *ds_run;
91 struct k3_dma_desc_sw *ds_done;
92 };
93
94 struct k3_dma_dev {
95 struct dma_device slave;
96 void __iomem *base;
97 struct tasklet_struct task;
98 spinlock_t lock;
99 struct list_head chan_pending;
100 struct k3_dma_phy *phy;
101 struct k3_dma_chan *chans;
102 struct clk *clk;
103 u32 dma_channels;
104 u32 dma_requests;
105 };
106
107 #define to_k3_dma(dmadev) container_of(dmadev, struct k3_dma_dev, slave)
108
109 static struct k3_dma_chan *to_k3_chan(struct dma_chan *chan)
110 {
111 return container_of(chan, struct k3_dma_chan, vc.chan);
112 }
113
114 static void k3_dma_pause_dma(struct k3_dma_phy *phy, bool on)
115 {
116 u32 val = 0;
117
118 if (on) {
119 val = readl_relaxed(phy->base + CX_CFG);
120 val |= CX_CFG_EN;
121 writel_relaxed(val, phy->base + CX_CFG);
122 } else {
123 val = readl_relaxed(phy->base + CX_CFG);
124 val &= ~CX_CFG_EN;
125 writel_relaxed(val, phy->base + CX_CFG);
126 }
127 }
128
129 static void k3_dma_terminate_chan(struct k3_dma_phy *phy, struct k3_dma_dev *d)
130 {
131 u32 val = 0;
132
133 k3_dma_pause_dma(phy, false);
134
135 val = 0x1 << phy->idx;
136 writel_relaxed(val, d->base + INT_TC1_RAW);
137 writel_relaxed(val, d->base + INT_ERR1_RAW);
138 writel_relaxed(val, d->base + INT_ERR2_RAW);
139 }
140
141 static void k3_dma_set_desc(struct k3_dma_phy *phy, struct k3_desc_hw *hw)
142 {
143 writel_relaxed(hw->lli, phy->base + CX_LLI);
144 writel_relaxed(hw->count, phy->base + CX_CNT);
145 writel_relaxed(hw->saddr, phy->base + CX_SRC);
146 writel_relaxed(hw->daddr, phy->base + CX_DST);
147 writel_relaxed(AXI_CFG_DEFAULT, phy->base + AXI_CFG);
148 writel_relaxed(hw->config, phy->base + CX_CFG);
149 }
150
151 static u32 k3_dma_get_curr_cnt(struct k3_dma_dev *d, struct k3_dma_phy *phy)
152 {
153 u32 cnt = 0;
154
155 cnt = readl_relaxed(d->base + CX_CUR_CNT + phy->idx * 0x10);
156 cnt &= 0xffff;
157 return cnt;
158 }
159
160 static u32 k3_dma_get_curr_lli(struct k3_dma_phy *phy)
161 {
162 return readl_relaxed(phy->base + CX_LLI);
163 }
164
165 static u32 k3_dma_get_chan_stat(struct k3_dma_dev *d)
166 {
167 return readl_relaxed(d->base + CH_STAT);
168 }
169
170 static void k3_dma_enable_dma(struct k3_dma_dev *d, bool on)
171 {
172 if (on) {
173 /* set same priority */
174 writel_relaxed(0x0, d->base + CH_PRI);
175
176 /* unmask irq */
177 writel_relaxed(0xffff, d->base + INT_TC1_MASK);
178 writel_relaxed(0xffff, d->base + INT_ERR1_MASK);
179 writel_relaxed(0xffff, d->base + INT_ERR2_MASK);
180 } else {
181 /* mask irq */
182 writel_relaxed(0x0, d->base + INT_TC1_MASK);
183 writel_relaxed(0x0, d->base + INT_ERR1_MASK);
184 writel_relaxed(0x0, d->base + INT_ERR2_MASK);
185 }
186 }
187
188 static irqreturn_t k3_dma_int_handler(int irq, void *dev_id)
189 {
190 struct k3_dma_dev *d = (struct k3_dma_dev *)dev_id;
191 struct k3_dma_phy *p;
192 struct k3_dma_chan *c;
193 u32 stat = readl_relaxed(d->base + INT_STAT);
194 u32 tc1 = readl_relaxed(d->base + INT_TC1);
195 u32 err1 = readl_relaxed(d->base + INT_ERR1);
196 u32 err2 = readl_relaxed(d->base + INT_ERR2);
197 u32 i, irq_chan = 0;
198
199 while (stat) {
200 i = __ffs(stat);
201 stat &= (stat - 1);
202 if (likely(tc1 & BIT(i))) {
203 p = &d->phy[i];
204 c = p->vchan;
205 if (c) {
206 unsigned long flags;
207
208 spin_lock_irqsave(&c->vc.lock, flags);
209 vchan_cookie_complete(&p->ds_run->vd);
210 p->ds_done = p->ds_run;
211 spin_unlock_irqrestore(&c->vc.lock, flags);
212 }
213 irq_chan |= BIT(i);
214 }
215 if (unlikely((err1 & BIT(i)) || (err2 & BIT(i))))
216 dev_warn(d->slave.dev, "DMA ERR\n");
217 }
218
219 writel_relaxed(irq_chan, d->base + INT_TC1_RAW);
220 writel_relaxed(err1, d->base + INT_ERR1_RAW);
221 writel_relaxed(err2, d->base + INT_ERR2_RAW);
222
223 if (irq_chan) {
224 tasklet_schedule(&d->task);
225 return IRQ_HANDLED;
226 } else
227 return IRQ_NONE;
228 }
229
230 static int k3_dma_start_txd(struct k3_dma_chan *c)
231 {
232 struct k3_dma_dev *d = to_k3_dma(c->vc.chan.device);
233 struct virt_dma_desc *vd = vchan_next_desc(&c->vc);
234
235 if (!c->phy)
236 return -EAGAIN;
237
238 if (BIT(c->phy->idx) & k3_dma_get_chan_stat(d))
239 return -EAGAIN;
240
241 if (vd) {
242 struct k3_dma_desc_sw *ds =
243 container_of(vd, struct k3_dma_desc_sw, vd);
244 /*
245 * fetch and remove request from vc->desc_issued
246 * so vc->desc_issued only contains desc pending
247 */
248 list_del(&ds->vd.node);
249 c->phy->ds_run = ds;
250 c->phy->ds_done = NULL;
251 /* start dma */
252 k3_dma_set_desc(c->phy, &ds->desc_hw[0]);
253 return 0;
254 }
255 c->phy->ds_done = NULL;
256 c->phy->ds_run = NULL;
257 return -EAGAIN;
258 }
259
260 static void k3_dma_tasklet(unsigned long arg)
261 {
262 struct k3_dma_dev *d = (struct k3_dma_dev *)arg;
263 struct k3_dma_phy *p;
264 struct k3_dma_chan *c, *cn;
265 unsigned pch, pch_alloc = 0;
266
267 /* check new dma request of running channel in vc->desc_issued */
268 list_for_each_entry_safe(c, cn, &d->slave.channels, vc.chan.device_node) {
269 spin_lock_irq(&c->vc.lock);
270 p = c->phy;
271 if (p && p->ds_done) {
272 if (k3_dma_start_txd(c)) {
273 /* No current txd associated with this channel */
274 dev_dbg(d->slave.dev, "pchan %u: free\n", p->idx);
275 /* Mark this channel free */
276 c->phy = NULL;
277 p->vchan = NULL;
278 }
279 }
280 spin_unlock_irq(&c->vc.lock);
281 }
282
283 /* check new channel request in d->chan_pending */
284 spin_lock_irq(&d->lock);
285 for (pch = 0; pch < d->dma_channels; pch++) {
286 p = &d->phy[pch];
287
288 if (p->vchan == NULL && !list_empty(&d->chan_pending)) {
289 c = list_first_entry(&d->chan_pending,
290 struct k3_dma_chan, node);
291 /* remove from d->chan_pending */
292 list_del_init(&c->node);
293 pch_alloc |= 1 << pch;
294 /* Mark this channel allocated */
295 p->vchan = c;
296 c->phy = p;
297 dev_dbg(d->slave.dev, "pchan %u: alloc vchan %p\n", pch, &c->vc);
298 }
299 }
300 spin_unlock_irq(&d->lock);
301
302 for (pch = 0; pch < d->dma_channels; pch++) {
303 if (pch_alloc & (1 << pch)) {
304 p = &d->phy[pch];
305 c = p->vchan;
306 if (c) {
307 spin_lock_irq(&c->vc.lock);
308 k3_dma_start_txd(c);
309 spin_unlock_irq(&c->vc.lock);
310 }
311 }
312 }
313 }
314
315 static void k3_dma_free_chan_resources(struct dma_chan *chan)
316 {
317 struct k3_dma_chan *c = to_k3_chan(chan);
318 struct k3_dma_dev *d = to_k3_dma(chan->device);
319 unsigned long flags;
320
321 spin_lock_irqsave(&d->lock, flags);
322 list_del_init(&c->node);
323 spin_unlock_irqrestore(&d->lock, flags);
324
325 vchan_free_chan_resources(&c->vc);
326 c->ccfg = 0;
327 }
328
329 static enum dma_status k3_dma_tx_status(struct dma_chan *chan,
330 dma_cookie_t cookie, struct dma_tx_state *state)
331 {
332 struct k3_dma_chan *c = to_k3_chan(chan);
333 struct k3_dma_dev *d = to_k3_dma(chan->device);
334 struct k3_dma_phy *p;
335 struct virt_dma_desc *vd;
336 unsigned long flags;
337 enum dma_status ret;
338 size_t bytes = 0;
339
340 ret = dma_cookie_status(&c->vc.chan, cookie, state);
341 if (ret == DMA_COMPLETE)
342 return ret;
343
344 spin_lock_irqsave(&c->vc.lock, flags);
345 p = c->phy;
346 ret = c->status;
347
348 /*
349 * If the cookie is on our issue queue, then the residue is
350 * its total size.
351 */
352 vd = vchan_find_desc(&c->vc, cookie);
353 if (vd) {
354 bytes = container_of(vd, struct k3_dma_desc_sw, vd)->size;
355 } else if ((!p) || (!p->ds_run)) {
356 bytes = 0;
357 } else {
358 struct k3_dma_desc_sw *ds = p->ds_run;
359 u32 clli = 0, index = 0;
360
361 bytes = k3_dma_get_curr_cnt(d, p);
362 clli = k3_dma_get_curr_lli(p);
363 index = (clli - ds->desc_hw_lli) / sizeof(struct k3_desc_hw);
364 for (; index < ds->desc_num; index++) {
365 bytes += ds->desc_hw[index].count;
366 /* end of lli */
367 if (!ds->desc_hw[index].lli)
368 break;
369 }
370 }
371 spin_unlock_irqrestore(&c->vc.lock, flags);
372 dma_set_residue(state, bytes);
373 return ret;
374 }
375
376 static void k3_dma_issue_pending(struct dma_chan *chan)
377 {
378 struct k3_dma_chan *c = to_k3_chan(chan);
379 struct k3_dma_dev *d = to_k3_dma(chan->device);
380 unsigned long flags;
381
382 spin_lock_irqsave(&c->vc.lock, flags);
383 /* add request to vc->desc_issued */
384 if (vchan_issue_pending(&c->vc)) {
385 spin_lock(&d->lock);
386 if (!c->phy) {
387 if (list_empty(&c->node)) {
388 /* if new channel, add chan_pending */
389 list_add_tail(&c->node, &d->chan_pending);
390 /* check in tasklet */
391 tasklet_schedule(&d->task);
392 dev_dbg(d->slave.dev, "vchan %p: issued\n", &c->vc);
393 }
394 }
395 spin_unlock(&d->lock);
396 } else
397 dev_dbg(d->slave.dev, "vchan %p: nothing to issue\n", &c->vc);
398 spin_unlock_irqrestore(&c->vc.lock, flags);
399 }
400
401 static void k3_dma_fill_desc(struct k3_dma_desc_sw *ds, dma_addr_t dst,
402 dma_addr_t src, size_t len, u32 num, u32 ccfg)
403 {
404 if ((num + 1) < ds->desc_num)
405 ds->desc_hw[num].lli = ds->desc_hw_lli + (num + 1) *
406 sizeof(struct k3_desc_hw);
407 ds->desc_hw[num].lli |= CX_LLI_CHAIN_EN;
408 ds->desc_hw[num].count = len;
409 ds->desc_hw[num].saddr = src;
410 ds->desc_hw[num].daddr = dst;
411 ds->desc_hw[num].config = ccfg;
412 }
413
414 static struct dma_async_tx_descriptor *k3_dma_prep_memcpy(
415 struct dma_chan *chan, dma_addr_t dst, dma_addr_t src,
416 size_t len, unsigned long flags)
417 {
418 struct k3_dma_chan *c = to_k3_chan(chan);
419 struct k3_dma_desc_sw *ds;
420 size_t copy = 0;
421 int num = 0;
422
423 if (!len)
424 return NULL;
425
426 num = DIV_ROUND_UP(len, DMA_MAX_SIZE);
427 ds = kzalloc(sizeof(*ds) + num * sizeof(ds->desc_hw[0]), GFP_ATOMIC);
428 if (!ds) {
429 dev_dbg(chan->device->dev, "vchan %p: kzalloc fail\n", &c->vc);
430 return NULL;
431 }
432 ds->desc_hw_lli = __virt_to_phys((unsigned long)&ds->desc_hw[0]);
433 ds->size = len;
434 ds->desc_num = num;
435 num = 0;
436
437 if (!c->ccfg) {
438 /* default is memtomem, without calling device_config */
439 c->ccfg = CX_CFG_SRCINCR | CX_CFG_DSTINCR | CX_CFG_EN;
440 c->ccfg |= (0xf << 20) | (0xf << 24); /* burst = 16 */
441 c->ccfg |= (0x3 << 12) | (0x3 << 16); /* width = 64 bit */
442 }
443
444 do {
445 copy = min_t(size_t, len, DMA_MAX_SIZE);
446 k3_dma_fill_desc(ds, dst, src, copy, num++, c->ccfg);
447
448 if (c->dir == DMA_MEM_TO_DEV) {
449 src += copy;
450 } else if (c->dir == DMA_DEV_TO_MEM) {
451 dst += copy;
452 } else {
453 src += copy;
454 dst += copy;
455 }
456 len -= copy;
457 } while (len);
458
459 ds->desc_hw[num-1].lli = 0; /* end of link */
460 return vchan_tx_prep(&c->vc, &ds->vd, flags);
461 }
462
463 static struct dma_async_tx_descriptor *k3_dma_prep_slave_sg(
464 struct dma_chan *chan, struct scatterlist *sgl, unsigned int sglen,
465 enum dma_transfer_direction dir, unsigned long flags, void *context)
466 {
467 struct k3_dma_chan *c = to_k3_chan(chan);
468 struct k3_dma_desc_sw *ds;
469 size_t len, avail, total = 0;
470 struct scatterlist *sg;
471 dma_addr_t addr, src = 0, dst = 0;
472 int num = sglen, i;
473
474 if (sgl == NULL)
475 return NULL;
476
477 for_each_sg(sgl, sg, sglen, i) {
478 avail = sg_dma_len(sg);
479 if (avail > DMA_MAX_SIZE)
480 num += DIV_ROUND_UP(avail, DMA_MAX_SIZE) - 1;
481 }
482
483 ds = kzalloc(sizeof(*ds) + num * sizeof(ds->desc_hw[0]), GFP_ATOMIC);
484 if (!ds) {
485 dev_dbg(chan->device->dev, "vchan %p: kzalloc fail\n", &c->vc);
486 return NULL;
487 }
488 ds->desc_hw_lli = __virt_to_phys((unsigned long)&ds->desc_hw[0]);
489 ds->desc_num = num;
490 num = 0;
491
492 for_each_sg(sgl, sg, sglen, i) {
493 addr = sg_dma_address(sg);
494 avail = sg_dma_len(sg);
495 total += avail;
496
497 do {
498 len = min_t(size_t, avail, DMA_MAX_SIZE);
499
500 if (dir == DMA_MEM_TO_DEV) {
501 src = addr;
502 dst = c->dev_addr;
503 } else if (dir == DMA_DEV_TO_MEM) {
504 src = c->dev_addr;
505 dst = addr;
506 }
507
508 k3_dma_fill_desc(ds, dst, src, len, num++, c->ccfg);
509
510 addr += len;
511 avail -= len;
512 } while (avail);
513 }
514
515 ds->desc_hw[num-1].lli = 0; /* end of link */
516 ds->size = total;
517 return vchan_tx_prep(&c->vc, &ds->vd, flags);
518 }
519
520 static int k3_dma_config(struct dma_chan *chan,
521 struct dma_slave_config *cfg)
522 {
523 struct k3_dma_chan *c = to_k3_chan(chan);
524 u32 maxburst = 0, val = 0;
525 enum dma_slave_buswidth width = DMA_SLAVE_BUSWIDTH_UNDEFINED;
526
527 if (cfg == NULL)
528 return -EINVAL;
529 c->dir = cfg->direction;
530 if (c->dir == DMA_DEV_TO_MEM) {
531 c->ccfg = CX_CFG_DSTINCR;
532 c->dev_addr = cfg->src_addr;
533 maxburst = cfg->src_maxburst;
534 width = cfg->src_addr_width;
535 } else if (c->dir == DMA_MEM_TO_DEV) {
536 c->ccfg = CX_CFG_SRCINCR;
537 c->dev_addr = cfg->dst_addr;
538 maxburst = cfg->dst_maxburst;
539 width = cfg->dst_addr_width;
540 }
541 switch (width) {
542 case DMA_SLAVE_BUSWIDTH_1_BYTE:
543 case DMA_SLAVE_BUSWIDTH_2_BYTES:
544 case DMA_SLAVE_BUSWIDTH_4_BYTES:
545 case DMA_SLAVE_BUSWIDTH_8_BYTES:
546 val = __ffs(width);
547 break;
548 default:
549 val = 3;
550 break;
551 }
552 c->ccfg |= (val << 12) | (val << 16);
553
554 if ((maxburst == 0) || (maxburst > 16))
555 val = 16;
556 else
557 val = maxburst - 1;
558 c->ccfg |= (val << 20) | (val << 24);
559 c->ccfg |= CX_CFG_MEM2PER | CX_CFG_EN;
560
561 /* specific request line */
562 c->ccfg |= c->vc.chan.chan_id << 4;
563
564 return 0;
565 }
566
567 static int k3_dma_terminate_all(struct dma_chan *chan)
568 {
569 struct k3_dma_chan *c = to_k3_chan(chan);
570 struct k3_dma_dev *d = to_k3_dma(chan->device);
571 struct k3_dma_phy *p = c->phy;
572 unsigned long flags;
573 LIST_HEAD(head);
574
575 dev_dbg(d->slave.dev, "vchan %p: terminate all\n", &c->vc);
576
577 /* Prevent this channel being scheduled */
578 spin_lock(&d->lock);
579 list_del_init(&c->node);
580 spin_unlock(&d->lock);
581
582 /* Clear the tx descriptor lists */
583 spin_lock_irqsave(&c->vc.lock, flags);
584 vchan_get_all_descriptors(&c->vc, &head);
585 if (p) {
586 /* vchan is assigned to a pchan - stop the channel */
587 k3_dma_terminate_chan(p, d);
588 c->phy = NULL;
589 p->vchan = NULL;
590 p->ds_run = p->ds_done = NULL;
591 }
592 spin_unlock_irqrestore(&c->vc.lock, flags);
593 vchan_dma_desc_free_list(&c->vc, &head);
594
595 return 0;
596 }
597
598 static int k3_dma_transfer_pause(struct dma_chan *chan)
599 {
600 struct k3_dma_chan *c = to_k3_chan(chan);
601 struct k3_dma_dev *d = to_k3_dma(chan->device);
602 struct k3_dma_phy *p = c->phy;
603
604 dev_dbg(d->slave.dev, "vchan %p: pause\n", &c->vc);
605 if (c->status == DMA_IN_PROGRESS) {
606 c->status = DMA_PAUSED;
607 if (p) {
608 k3_dma_pause_dma(p, false);
609 } else {
610 spin_lock(&d->lock);
611 list_del_init(&c->node);
612 spin_unlock(&d->lock);
613 }
614 }
615
616 return 0;
617 }
618
619 static int k3_dma_transfer_resume(struct dma_chan *chan)
620 {
621 struct k3_dma_chan *c = to_k3_chan(chan);
622 struct k3_dma_dev *d = to_k3_dma(chan->device);
623 struct k3_dma_phy *p = c->phy;
624 unsigned long flags;
625
626 dev_dbg(d->slave.dev, "vchan %p: resume\n", &c->vc);
627 spin_lock_irqsave(&c->vc.lock, flags);
628 if (c->status == DMA_PAUSED) {
629 c->status = DMA_IN_PROGRESS;
630 if (p) {
631 k3_dma_pause_dma(p, true);
632 } else if (!list_empty(&c->vc.desc_issued)) {
633 spin_lock(&d->lock);
634 list_add_tail(&c->node, &d->chan_pending);
635 spin_unlock(&d->lock);
636 }
637 }
638 spin_unlock_irqrestore(&c->vc.lock, flags);
639
640 return 0;
641 }
642
643 static void k3_dma_free_desc(struct virt_dma_desc *vd)
644 {
645 struct k3_dma_desc_sw *ds =
646 container_of(vd, struct k3_dma_desc_sw, vd);
647
648 kfree(ds);
649 }
650
651 static const struct of_device_id k3_pdma_dt_ids[] = {
652 { .compatible = "hisilicon,k3-dma-1.0", },
653 {}
654 };
655 MODULE_DEVICE_TABLE(of, k3_pdma_dt_ids);
656
657 static struct dma_chan *k3_of_dma_simple_xlate(struct of_phandle_args *dma_spec,
658 struct of_dma *ofdma)
659 {
660 struct k3_dma_dev *d = ofdma->of_dma_data;
661 unsigned int request = dma_spec->args[0];
662
663 if (request > d->dma_requests)
664 return NULL;
665
666 return dma_get_slave_channel(&(d->chans[request].vc.chan));
667 }
668
669 static int k3_dma_probe(struct platform_device *op)
670 {
671 struct k3_dma_dev *d;
672 const struct of_device_id *of_id;
673 struct resource *iores;
674 int i, ret, irq = 0;
675
676 iores = platform_get_resource(op, IORESOURCE_MEM, 0);
677 if (!iores)
678 return -EINVAL;
679
680 d = devm_kzalloc(&op->dev, sizeof(*d), GFP_KERNEL);
681 if (!d)
682 return -ENOMEM;
683
684 d->base = devm_ioremap_resource(&op->dev, iores);
685 if (IS_ERR(d->base))
686 return PTR_ERR(d->base);
687
688 of_id = of_match_device(k3_pdma_dt_ids, &op->dev);
689 if (of_id) {
690 of_property_read_u32((&op->dev)->of_node,
691 "dma-channels", &d->dma_channels);
692 of_property_read_u32((&op->dev)->of_node,
693 "dma-requests", &d->dma_requests);
694 }
695
696 d->clk = devm_clk_get(&op->dev, NULL);
697 if (IS_ERR(d->clk)) {
698 dev_err(&op->dev, "no dma clk\n");
699 return PTR_ERR(d->clk);
700 }
701
702 irq = platform_get_irq(op, 0);
703 ret = devm_request_irq(&op->dev, irq,
704 k3_dma_int_handler, 0, DRIVER_NAME, d);
705 if (ret)
706 return ret;
707
708 /* init phy channel */
709 d->phy = devm_kzalloc(&op->dev,
710 d->dma_channels * sizeof(struct k3_dma_phy), GFP_KERNEL);
711 if (d->phy == NULL)
712 return -ENOMEM;
713
714 for (i = 0; i < d->dma_channels; i++) {
715 struct k3_dma_phy *p = &d->phy[i];
716
717 p->idx = i;
718 p->base = d->base + i * 0x40;
719 }
720
721 INIT_LIST_HEAD(&d->slave.channels);
722 dma_cap_set(DMA_SLAVE, d->slave.cap_mask);
723 dma_cap_set(DMA_MEMCPY, d->slave.cap_mask);
724 d->slave.dev = &op->dev;
725 d->slave.device_free_chan_resources = k3_dma_free_chan_resources;
726 d->slave.device_tx_status = k3_dma_tx_status;
727 d->slave.device_prep_dma_memcpy = k3_dma_prep_memcpy;
728 d->slave.device_prep_slave_sg = k3_dma_prep_slave_sg;
729 d->slave.device_issue_pending = k3_dma_issue_pending;
730 d->slave.device_config = k3_dma_config;
731 d->slave.device_pause = k3_dma_transfer_pause;
732 d->slave.device_resume = k3_dma_transfer_resume;
733 d->slave.device_terminate_all = k3_dma_terminate_all;
734 d->slave.copy_align = DMAENGINE_ALIGN_8_BYTES;
735
736 /* init virtual channel */
737 d->chans = devm_kzalloc(&op->dev,
738 d->dma_requests * sizeof(struct k3_dma_chan), GFP_KERNEL);
739 if (d->chans == NULL)
740 return -ENOMEM;
741
742 for (i = 0; i < d->dma_requests; i++) {
743 struct k3_dma_chan *c = &d->chans[i];
744
745 c->status = DMA_IN_PROGRESS;
746 INIT_LIST_HEAD(&c->node);
747 c->vc.desc_free = k3_dma_free_desc;
748 vchan_init(&c->vc, &d->slave);
749 }
750
751 /* Enable clock before accessing registers */
752 ret = clk_prepare_enable(d->clk);
753 if (ret < 0) {
754 dev_err(&op->dev, "clk_prepare_enable failed: %d\n", ret);
755 return ret;
756 }
757
758 k3_dma_enable_dma(d, true);
759
760 ret = dma_async_device_register(&d->slave);
761 if (ret)
762 return ret;
763
764 ret = of_dma_controller_register((&op->dev)->of_node,
765 k3_of_dma_simple_xlate, d);
766 if (ret)
767 goto of_dma_register_fail;
768
769 spin_lock_init(&d->lock);
770 INIT_LIST_HEAD(&d->chan_pending);
771 tasklet_init(&d->task, k3_dma_tasklet, (unsigned long)d);
772 platform_set_drvdata(op, d);
773 dev_info(&op->dev, "initialized\n");
774
775 return 0;
776
777 of_dma_register_fail:
778 dma_async_device_unregister(&d->slave);
779 return ret;
780 }
781
782 static int k3_dma_remove(struct platform_device *op)
783 {
784 struct k3_dma_chan *c, *cn;
785 struct k3_dma_dev *d = platform_get_drvdata(op);
786
787 dma_async_device_unregister(&d->slave);
788 of_dma_controller_free((&op->dev)->of_node);
789
790 list_for_each_entry_safe(c, cn, &d->slave.channels, vc.chan.device_node) {
791 list_del(&c->vc.chan.device_node);
792 tasklet_kill(&c->vc.task);
793 }
794 tasklet_kill(&d->task);
795 clk_disable_unprepare(d->clk);
796 return 0;
797 }
798
799 #ifdef CONFIG_PM_SLEEP
800 static int k3_dma_suspend_dev(struct device *dev)
801 {
802 struct k3_dma_dev *d = dev_get_drvdata(dev);
803 u32 stat = 0;
804
805 stat = k3_dma_get_chan_stat(d);
806 if (stat) {
807 dev_warn(d->slave.dev,
808 "chan %d is running fail to suspend\n", stat);
809 return -1;
810 }
811 k3_dma_enable_dma(d, false);
812 clk_disable_unprepare(d->clk);
813 return 0;
814 }
815
816 static int k3_dma_resume_dev(struct device *dev)
817 {
818 struct k3_dma_dev *d = dev_get_drvdata(dev);
819 int ret = 0;
820
821 ret = clk_prepare_enable(d->clk);
822 if (ret < 0) {
823 dev_err(d->slave.dev, "clk_prepare_enable failed: %d\n", ret);
824 return ret;
825 }
826 k3_dma_enable_dma(d, true);
827 return 0;
828 }
829 #endif
830
831 static SIMPLE_DEV_PM_OPS(k3_dma_pmops, k3_dma_suspend_dev, k3_dma_resume_dev);
832
833 static struct platform_driver k3_pdma_driver = {
834 .driver = {
835 .name = DRIVER_NAME,
836 .pm = &k3_dma_pmops,
837 .of_match_table = k3_pdma_dt_ids,
838 },
839 .probe = k3_dma_probe,
840 .remove = k3_dma_remove,
841 };
842
843 module_platform_driver(k3_pdma_driver);
844
845 MODULE_DESCRIPTION("Hisilicon k3 DMA Driver");
846 MODULE_ALIAS("platform:k3dma");
847 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support