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PM / Domains: Try power off masters in error path of __pm_genpd_poweron()
[linux/fpc-iii.git] / drivers / dma / mmp_tdma.c
blobe683761e0f8f899c0d693efc7714ed1194fabc0c
1 /*
2 * Driver For Marvell Two-channel DMA Engine
3 *
4 * Copyright: Marvell International Ltd.
5 *
6 * The code contained herein is licensed under the GNU General Public
7 * License. You may obtain a copy of the GNU General Public License
8 * Version 2 or later at the following locations:
9 *
10 */
11
12 #include <linux/err.h>
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/types.h>
16 #include <linux/interrupt.h>
17 #include <linux/dma-mapping.h>
18 #include <linux/slab.h>
19 #include <linux/dmaengine.h>
20 #include <linux/platform_device.h>
21 #include <linux/device.h>
22 #include <linux/platform_data/dma-mmp_tdma.h>
23 #include <linux/of_device.h>
24 #include <linux/of_dma.h>
25
26 #include "dmaengine.h"
27
28 /*
29 * Two-Channel DMA registers
30 */
31 #define TDBCR 0x00 /* Byte Count */
32 #define TDSAR 0x10 /* Src Addr */
33 #define TDDAR 0x20 /* Dst Addr */
34 #define TDNDPR 0x30 /* Next Desc */
35 #define TDCR 0x40 /* Control */
36 #define TDCP 0x60 /* Priority*/
37 #define TDCDPR 0x70 /* Current Desc */
38 #define TDIMR 0x80 /* Int Mask */
39 #define TDISR 0xa0 /* Int Status */
40
41 /* Two-Channel DMA Control Register */
42 #define TDCR_SSZ_8_BITS (0x0 << 22) /* Sample Size */
43 #define TDCR_SSZ_12_BITS (0x1 << 22)
44 #define TDCR_SSZ_16_BITS (0x2 << 22)
45 #define TDCR_SSZ_20_BITS (0x3 << 22)
46 #define TDCR_SSZ_24_BITS (0x4 << 22)
47 #define TDCR_SSZ_32_BITS (0x5 << 22)
48 #define TDCR_SSZ_SHIFT (0x1 << 22)
49 #define TDCR_SSZ_MASK (0x7 << 22)
50 #define TDCR_SSPMOD (0x1 << 21) /* SSP MOD */
51 #define TDCR_ABR (0x1 << 20) /* Channel Abort */
52 #define TDCR_CDE (0x1 << 17) /* Close Desc Enable */
53 #define TDCR_PACKMOD (0x1 << 16) /* Pack Mode (ADMA Only) */
54 #define TDCR_CHANACT (0x1 << 14) /* Channel Active */
55 #define TDCR_FETCHND (0x1 << 13) /* Fetch Next Desc */
56 #define TDCR_CHANEN (0x1 << 12) /* Channel Enable */
57 #define TDCR_INTMODE (0x1 << 10) /* Interrupt Mode */
58 #define TDCR_CHAINMOD (0x1 << 9) /* Chain Mode */
59 #define TDCR_BURSTSZ_MSK (0x7 << 6) /* Burst Size */
60 #define TDCR_BURSTSZ_4B (0x0 << 6)
61 #define TDCR_BURSTSZ_8B (0x1 << 6)
62 #define TDCR_BURSTSZ_16B (0x3 << 6)
63 #define TDCR_BURSTSZ_32B (0x6 << 6)
64 #define TDCR_BURSTSZ_64B (0x7 << 6)
65 #define TDCR_BURSTSZ_SQU_1B (0x5 << 6)
66 #define TDCR_BURSTSZ_SQU_2B (0x6 << 6)
67 #define TDCR_BURSTSZ_SQU_4B (0x0 << 6)
68 #define TDCR_BURSTSZ_SQU_8B (0x1 << 6)
69 #define TDCR_BURSTSZ_SQU_16B (0x3 << 6)
70 #define TDCR_BURSTSZ_SQU_32B (0x7 << 6)
71 #define TDCR_BURSTSZ_128B (0x5 << 6)
72 #define TDCR_DSTDIR_MSK (0x3 << 4) /* Dst Direction */
73 #define TDCR_DSTDIR_ADDR_HOLD (0x2 << 4) /* Dst Addr Hold */
74 #define TDCR_DSTDIR_ADDR_INC (0x0 << 4) /* Dst Addr Increment */
75 #define TDCR_SRCDIR_MSK (0x3 << 2) /* Src Direction */
76 #define TDCR_SRCDIR_ADDR_HOLD (0x2 << 2) /* Src Addr Hold */
77 #define TDCR_SRCDIR_ADDR_INC (0x0 << 2) /* Src Addr Increment */
78 #define TDCR_DSTDESCCONT (0x1 << 1)
79 #define TDCR_SRCDESTCONT (0x1 << 0)
80
81 /* Two-Channel DMA Int Mask Register */
82 #define TDIMR_COMP (0x1 << 0)
83
84 /* Two-Channel DMA Int Status Register */
85 #define TDISR_COMP (0x1 << 0)
86
87 /*
88 * Two-Channel DMA Descriptor Struct
89 * NOTE: desc's buf must be aligned to 16 bytes.
90 */
91 struct mmp_tdma_desc {
92 u32 byte_cnt;
93 u32 src_addr;
94 u32 dst_addr;
95 u32 nxt_desc;
96 };
97
98 enum mmp_tdma_type {
99 MMP_AUD_TDMA = 0,
100 PXA910_SQU,
101 };
102
103 #define TDMA_ALIGNMENT 3
104 #define TDMA_MAX_XFER_BYTES SZ_64K
105
106 struct mmp_tdma_chan {
107 struct device *dev;
108 struct dma_chan chan;
109 struct dma_async_tx_descriptor desc;
110 struct tasklet_struct tasklet;
111
112 struct mmp_tdma_desc *desc_arr;
113 dma_addr_t desc_arr_phys;
114 int desc_num;
115 enum dma_transfer_direction dir;
116 dma_addr_t dev_addr;
117 u32 burst_sz;
118 enum dma_slave_buswidth buswidth;
119 enum dma_status status;
120
121 int idx;
122 enum mmp_tdma_type type;
123 int irq;
124 void __iomem *reg_base;
125
126 size_t buf_len;
127 size_t period_len;
128 size_t pos;
129
130 struct gen_pool *pool;
131 };
132
133 #define TDMA_CHANNEL_NUM 2
134 struct mmp_tdma_device {
135 struct device *dev;
136 void __iomem *base;
137 struct dma_device device;
138 struct mmp_tdma_chan *tdmac[TDMA_CHANNEL_NUM];
139 };
140
141 #define to_mmp_tdma_chan(dchan) container_of(dchan, struct mmp_tdma_chan, chan)
142
143 static void mmp_tdma_chan_set_desc(struct mmp_tdma_chan *tdmac, dma_addr_t phys)
144 {
145 writel(phys, tdmac->reg_base + TDNDPR);
146 writel(readl(tdmac->reg_base + TDCR) | TDCR_FETCHND,
147 tdmac->reg_base + TDCR);
148 }
149
150 static void mmp_tdma_enable_irq(struct mmp_tdma_chan *tdmac, bool enable)
151 {
152 if (enable)
153 writel(TDIMR_COMP, tdmac->reg_base + TDIMR);
154 else
155 writel(0, tdmac->reg_base + TDIMR);
156 }
157
158 static void mmp_tdma_enable_chan(struct mmp_tdma_chan *tdmac)
159 {
160 /* enable dma chan */
161 writel(readl(tdmac->reg_base + TDCR) | TDCR_CHANEN,
162 tdmac->reg_base + TDCR);
163 tdmac->status = DMA_IN_PROGRESS;
164 }
165
166 static int mmp_tdma_disable_chan(struct dma_chan *chan)
167 {
168 struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan);
169 u32 tdcr;
170
171 tdcr = readl(tdmac->reg_base + TDCR);
172 tdcr |= TDCR_ABR;
173 tdcr &= ~TDCR_CHANEN;
174 writel(tdcr, tdmac->reg_base + TDCR);
175
176 tdmac->status = DMA_COMPLETE;
177
178 return 0;
179 }
180
181 static int mmp_tdma_resume_chan(struct dma_chan *chan)
182 {
183 struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan);
184
185 writel(readl(tdmac->reg_base + TDCR) | TDCR_CHANEN,
186 tdmac->reg_base + TDCR);
187 tdmac->status = DMA_IN_PROGRESS;
188
189 return 0;
190 }
191
192 static int mmp_tdma_pause_chan(struct dma_chan *chan)
193 {
194 struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan);
195
196 writel(readl(tdmac->reg_base + TDCR) & ~TDCR_CHANEN,
197 tdmac->reg_base + TDCR);
198 tdmac->status = DMA_PAUSED;
199
200 return 0;
201 }
202
203 static int mmp_tdma_config_chan(struct dma_chan *chan)
204 {
205 struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan);
206 unsigned int tdcr = 0;
207
208 mmp_tdma_disable_chan(chan);
209
210 if (tdmac->dir == DMA_MEM_TO_DEV)
211 tdcr = TDCR_DSTDIR_ADDR_HOLD | TDCR_SRCDIR_ADDR_INC;
212 else if (tdmac->dir == DMA_DEV_TO_MEM)
213 tdcr = TDCR_SRCDIR_ADDR_HOLD | TDCR_DSTDIR_ADDR_INC;
214
215 if (tdmac->type == MMP_AUD_TDMA) {
216 tdcr |= TDCR_PACKMOD;
217
218 switch (tdmac->burst_sz) {
219 case 4:
220 tdcr |= TDCR_BURSTSZ_4B;
221 break;
222 case 8:
223 tdcr |= TDCR_BURSTSZ_8B;
224 break;
225 case 16:
226 tdcr |= TDCR_BURSTSZ_16B;
227 break;
228 case 32:
229 tdcr |= TDCR_BURSTSZ_32B;
230 break;
231 case 64:
232 tdcr |= TDCR_BURSTSZ_64B;
233 break;
234 case 128:
235 tdcr |= TDCR_BURSTSZ_128B;
236 break;
237 default:
238 dev_err(tdmac->dev, "mmp_tdma: unknown burst size.\n");
239 return -EINVAL;
240 }
241
242 switch (tdmac->buswidth) {
243 case DMA_SLAVE_BUSWIDTH_1_BYTE:
244 tdcr |= TDCR_SSZ_8_BITS;
245 break;
246 case DMA_SLAVE_BUSWIDTH_2_BYTES:
247 tdcr |= TDCR_SSZ_16_BITS;
248 break;
249 case DMA_SLAVE_BUSWIDTH_4_BYTES:
250 tdcr |= TDCR_SSZ_32_BITS;
251 break;
252 default:
253 dev_err(tdmac->dev, "mmp_tdma: unknown bus size.\n");
254 return -EINVAL;
255 }
256 } else if (tdmac->type == PXA910_SQU) {
257 tdcr |= TDCR_SSPMOD;
258
259 switch (tdmac->burst_sz) {
260 case 1:
261 tdcr |= TDCR_BURSTSZ_SQU_1B;
262 break;
263 case 2:
264 tdcr |= TDCR_BURSTSZ_SQU_2B;
265 break;
266 case 4:
267 tdcr |= TDCR_BURSTSZ_SQU_4B;
268 break;
269 case 8:
270 tdcr |= TDCR_BURSTSZ_SQU_8B;
271 break;
272 case 16:
273 tdcr |= TDCR_BURSTSZ_SQU_16B;
274 break;
275 case 32:
276 tdcr |= TDCR_BURSTSZ_SQU_32B;
277 break;
278 default:
279 dev_err(tdmac->dev, "mmp_tdma: unknown burst size.\n");
280 return -EINVAL;
281 }
282 }
283
284 writel(tdcr, tdmac->reg_base + TDCR);
285 return 0;
286 }
287
288 static int mmp_tdma_clear_chan_irq(struct mmp_tdma_chan *tdmac)
289 {
290 u32 reg = readl(tdmac->reg_base + TDISR);
291
292 if (reg & TDISR_COMP) {
293 /* clear irq */
294 reg &= ~TDISR_COMP;
295 writel(reg, tdmac->reg_base + TDISR);
296
297 return 0;
298 }
299 return -EAGAIN;
300 }
301
302 static size_t mmp_tdma_get_pos(struct mmp_tdma_chan *tdmac)
303 {
304 size_t reg;
305
306 if (tdmac->idx == 0) {
307 reg = __raw_readl(tdmac->reg_base + TDSAR);
308 reg -= tdmac->desc_arr[0].src_addr;
309 } else if (tdmac->idx == 1) {
310 reg = __raw_readl(tdmac->reg_base + TDDAR);
311 reg -= tdmac->desc_arr[0].dst_addr;
312 } else
313 return -EINVAL;
314
315 return reg;
316 }
317
318 static irqreturn_t mmp_tdma_chan_handler(int irq, void *dev_id)
319 {
320 struct mmp_tdma_chan *tdmac = dev_id;
321
322 if (mmp_tdma_clear_chan_irq(tdmac) == 0) {
323 tasklet_schedule(&tdmac->tasklet);
324 return IRQ_HANDLED;
325 } else
326 return IRQ_NONE;
327 }
328
329 static irqreturn_t mmp_tdma_int_handler(int irq, void *dev_id)
330 {
331 struct mmp_tdma_device *tdev = dev_id;
332 int i, ret;
333 int irq_num = 0;
334
335 for (i = 0; i < TDMA_CHANNEL_NUM; i++) {
336 struct mmp_tdma_chan *tdmac = tdev->tdmac[i];
337
338 ret = mmp_tdma_chan_handler(irq, tdmac);
339 if (ret == IRQ_HANDLED)
340 irq_num++;
341 }
342
343 if (irq_num)
344 return IRQ_HANDLED;
345 else
346 return IRQ_NONE;
347 }
348
349 static void dma_do_tasklet(unsigned long data)
350 {
351 struct mmp_tdma_chan *tdmac = (struct mmp_tdma_chan *)data;
352
353 if (tdmac->desc.callback)
354 tdmac->desc.callback(tdmac->desc.callback_param);
355
356 }
357
358 static void mmp_tdma_free_descriptor(struct mmp_tdma_chan *tdmac)
359 {
360 struct gen_pool *gpool;
361 int size = tdmac->desc_num * sizeof(struct mmp_tdma_desc);
362
363 gpool = tdmac->pool;
364 if (gpool && tdmac->desc_arr)
365 gen_pool_free(gpool, (unsigned long)tdmac->desc_arr,
366 size);
367 tdmac->desc_arr = NULL;
368
369 return;
370 }
371
372 static dma_cookie_t mmp_tdma_tx_submit(struct dma_async_tx_descriptor *tx)
373 {
374 struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(tx->chan);
375
376 mmp_tdma_chan_set_desc(tdmac, tdmac->desc_arr_phys);
377
378 return 0;
379 }
380
381 static int mmp_tdma_alloc_chan_resources(struct dma_chan *chan)
382 {
383 struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan);
384 int ret;
385
386 dma_async_tx_descriptor_init(&tdmac->desc, chan);
387 tdmac->desc.tx_submit = mmp_tdma_tx_submit;
388
389 if (tdmac->irq) {
390 ret = devm_request_irq(tdmac->dev, tdmac->irq,
391 mmp_tdma_chan_handler, 0, "tdma", tdmac);
392 if (ret)
393 return ret;
394 }
395 return 1;
396 }
397
398 static void mmp_tdma_free_chan_resources(struct dma_chan *chan)
399 {
400 struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan);
401
402 if (tdmac->irq)
403 devm_free_irq(tdmac->dev, tdmac->irq, tdmac);
404 mmp_tdma_free_descriptor(tdmac);
405 return;
406 }
407
408 struct mmp_tdma_desc *mmp_tdma_alloc_descriptor(struct mmp_tdma_chan *tdmac)
409 {
410 struct gen_pool *gpool;
411 int size = tdmac->desc_num * sizeof(struct mmp_tdma_desc);
412
413 gpool = tdmac->pool;
414 if (!gpool)
415 return NULL;
416
417 tdmac->desc_arr = gen_pool_dma_alloc(gpool, size, &tdmac->desc_arr_phys);
418
419 return tdmac->desc_arr;
420 }
421
422 static struct dma_async_tx_descriptor *mmp_tdma_prep_dma_cyclic(
423 struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len,
424 size_t period_len, enum dma_transfer_direction direction,
425 unsigned long flags)
426 {
427 struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan);
428 struct mmp_tdma_desc *desc;
429 int num_periods = buf_len / period_len;
430 int i = 0, buf = 0;
431
432 if (tdmac->status != DMA_COMPLETE)
433 return NULL;
434
435 if (period_len > TDMA_MAX_XFER_BYTES) {
436 dev_err(tdmac->dev,
437 "maximum period size exceeded: %d > %d\n",
438 period_len, TDMA_MAX_XFER_BYTES);
439 goto err_out;
440 }
441
442 tdmac->status = DMA_IN_PROGRESS;
443 tdmac->desc_num = num_periods;
444 desc = mmp_tdma_alloc_descriptor(tdmac);
445 if (!desc)
446 goto err_out;
447
448 while (buf < buf_len) {
449 desc = &tdmac->desc_arr[i];
450
451 if (i + 1 == num_periods)
452 desc->nxt_desc = tdmac->desc_arr_phys;
453 else
454 desc->nxt_desc = tdmac->desc_arr_phys +
455 sizeof(*desc) * (i + 1);
456
457 if (direction == DMA_MEM_TO_DEV) {
458 desc->src_addr = dma_addr;
459 desc->dst_addr = tdmac->dev_addr;
460 } else {
461 desc->src_addr = tdmac->dev_addr;
462 desc->dst_addr = dma_addr;
463 }
464 desc->byte_cnt = period_len;
465 dma_addr += period_len;
466 buf += period_len;
467 i++;
468 }
469
470 /* enable interrupt */
471 if (flags & DMA_PREP_INTERRUPT)
472 mmp_tdma_enable_irq(tdmac, true);
473
474 tdmac->buf_len = buf_len;
475 tdmac->period_len = period_len;
476 tdmac->pos = 0;
477
478 return &tdmac->desc;
479
480 err_out:
481 tdmac->status = DMA_ERROR;
482 return NULL;
483 }
484
485 static int mmp_tdma_terminate_all(struct dma_chan *chan)
486 {
487 struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan);
488
489 mmp_tdma_disable_chan(chan);
490 /* disable interrupt */
491 mmp_tdma_enable_irq(tdmac, false);
492
493 return 0;
494 }
495
496 static int mmp_tdma_config(struct dma_chan *chan,
497 struct dma_slave_config *dmaengine_cfg)
498 {
499 struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan);
500
501 if (dmaengine_cfg->direction == DMA_DEV_TO_MEM) {
502 tdmac->dev_addr = dmaengine_cfg->src_addr;
503 tdmac->burst_sz = dmaengine_cfg->src_maxburst;
504 tdmac->buswidth = dmaengine_cfg->src_addr_width;
505 } else {
506 tdmac->dev_addr = dmaengine_cfg->dst_addr;
507 tdmac->burst_sz = dmaengine_cfg->dst_maxburst;
508 tdmac->buswidth = dmaengine_cfg->dst_addr_width;
509 }
510 tdmac->dir = dmaengine_cfg->direction;
511
512 return mmp_tdma_config_chan(chan);
513 }
514
515 static enum dma_status mmp_tdma_tx_status(struct dma_chan *chan,
516 dma_cookie_t cookie, struct dma_tx_state *txstate)
517 {
518 struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan);
519
520 tdmac->pos = mmp_tdma_get_pos(tdmac);
521 dma_set_tx_state(txstate, chan->completed_cookie, chan->cookie,
522 tdmac->buf_len - tdmac->pos);
523
524 return tdmac->status;
525 }
526
527 static void mmp_tdma_issue_pending(struct dma_chan *chan)
528 {
529 struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan);
530
531 mmp_tdma_enable_chan(tdmac);
532 }
533
534 static int mmp_tdma_remove(struct platform_device *pdev)
535 {
536 struct mmp_tdma_device *tdev = platform_get_drvdata(pdev);
537
538 dma_async_device_unregister(&tdev->device);
539 return 0;
540 }
541
542 static int mmp_tdma_chan_init(struct mmp_tdma_device *tdev,
543 int idx, int irq,
544 int type, struct gen_pool *pool)
545 {
546 struct mmp_tdma_chan *tdmac;
547
548 if (idx >= TDMA_CHANNEL_NUM) {
549 dev_err(tdev->dev, "too many channels for device!\n");
550 return -EINVAL;
551 }
552
553 /* alloc channel */
554 tdmac = devm_kzalloc(tdev->dev, sizeof(*tdmac), GFP_KERNEL);
555 if (!tdmac) {
556 dev_err(tdev->dev, "no free memory for DMA channels!\n");
557 return -ENOMEM;
558 }
559 if (irq)
560 tdmac->irq = irq;
561 tdmac->dev = tdev->dev;
562 tdmac->chan.device = &tdev->device;
563 tdmac->idx = idx;
564 tdmac->type = type;
565 tdmac->reg_base = tdev->base + idx * 4;
566 tdmac->pool = pool;
567 tdmac->status = DMA_COMPLETE;
568 tdev->tdmac[tdmac->idx] = tdmac;
569 tasklet_init(&tdmac->tasklet, dma_do_tasklet, (unsigned long)tdmac);
570
571 /* add the channel to tdma_chan list */
572 list_add_tail(&tdmac->chan.device_node,
573 &tdev->device.channels);
574 return 0;
575 }
576
577 struct mmp_tdma_filter_param {
578 struct device_node *of_node;
579 unsigned int chan_id;
580 };
581
582 static bool mmp_tdma_filter_fn(struct dma_chan *chan, void *fn_param)
583 {
584 struct mmp_tdma_filter_param *param = fn_param;
585 struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan);
586 struct dma_device *pdma_device = tdmac->chan.device;
587
588 if (pdma_device->dev->of_node != param->of_node)
589 return false;
590
591 if (chan->chan_id != param->chan_id)
592 return false;
593
594 return true;
595 }
596
597 struct dma_chan *mmp_tdma_xlate(struct of_phandle_args *dma_spec,
598 struct of_dma *ofdma)
599 {
600 struct mmp_tdma_device *tdev = ofdma->of_dma_data;
601 dma_cap_mask_t mask = tdev->device.cap_mask;
602 struct mmp_tdma_filter_param param;
603
604 if (dma_spec->args_count != 1)
605 return NULL;
606
607 param.of_node = ofdma->of_node;
608 param.chan_id = dma_spec->args[0];
609
610 if (param.chan_id >= TDMA_CHANNEL_NUM)
611 return NULL;
612
613 return dma_request_channel(mask, mmp_tdma_filter_fn, &param);
614 }
615
616 static const struct of_device_id mmp_tdma_dt_ids[] = {
617 { .compatible = "marvell,adma-1.0", .data = (void *)MMP_AUD_TDMA},
618 { .compatible = "marvell,pxa910-squ", .data = (void *)PXA910_SQU},
619 {}
620 };
621 MODULE_DEVICE_TABLE(of, mmp_tdma_dt_ids);
622
623 static int mmp_tdma_probe(struct platform_device *pdev)
624 {
625 enum mmp_tdma_type type;
626 const struct of_device_id *of_id;
627 struct mmp_tdma_device *tdev;
628 struct resource *iores;
629 int i, ret;
630 int irq = 0, irq_num = 0;
631 int chan_num = TDMA_CHANNEL_NUM;
632 struct gen_pool *pool = NULL;
633
634 of_id = of_match_device(mmp_tdma_dt_ids, &pdev->dev);
635 if (of_id)
636 type = (enum mmp_tdma_type) of_id->data;
637 else
638 type = platform_get_device_id(pdev)->driver_data;
639
640 /* always have couple channels */
641 tdev = devm_kzalloc(&pdev->dev, sizeof(*tdev), GFP_KERNEL);
642 if (!tdev)
643 return -ENOMEM;
644
645 tdev->dev = &pdev->dev;
646
647 for (i = 0; i < chan_num; i++) {
648 if (platform_get_irq(pdev, i) > 0)
649 irq_num++;
650 }
651
652 iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
653 tdev->base = devm_ioremap_resource(&pdev->dev, iores);
654 if (IS_ERR(tdev->base))
655 return PTR_ERR(tdev->base);
656
657 INIT_LIST_HEAD(&tdev->device.channels);
658
659 if (pdev->dev.of_node)
660 pool = of_gen_pool_get(pdev->dev.of_node, "asram", 0);
661 else
662 pool = sram_get_gpool("asram");
663 if (!pool) {
664 dev_err(&pdev->dev, "asram pool not available\n");
665 return -ENOMEM;
666 }
667
668 if (irq_num != chan_num) {
669 irq = platform_get_irq(pdev, 0);
670 ret = devm_request_irq(&pdev->dev, irq,
671 mmp_tdma_int_handler, 0, "tdma", tdev);
672 if (ret)
673 return ret;
674 }
675
676 /* initialize channel parameters */
677 for (i = 0; i < chan_num; i++) {
678 irq = (irq_num != chan_num) ? 0 : platform_get_irq(pdev, i);
679 ret = mmp_tdma_chan_init(tdev, i, irq, type, pool);
680 if (ret)
681 return ret;
682 }
683
684 dma_cap_set(DMA_SLAVE, tdev->device.cap_mask);
685 dma_cap_set(DMA_CYCLIC, tdev->device.cap_mask);
686 tdev->device.dev = &pdev->dev;
687 tdev->device.device_alloc_chan_resources =
688 mmp_tdma_alloc_chan_resources;
689 tdev->device.device_free_chan_resources =
690 mmp_tdma_free_chan_resources;
691 tdev->device.device_prep_dma_cyclic = mmp_tdma_prep_dma_cyclic;
692 tdev->device.device_tx_status = mmp_tdma_tx_status;
693 tdev->device.device_issue_pending = mmp_tdma_issue_pending;
694 tdev->device.device_config = mmp_tdma_config;
695 tdev->device.device_pause = mmp_tdma_pause_chan;
696 tdev->device.device_resume = mmp_tdma_resume_chan;
697 tdev->device.device_terminate_all = mmp_tdma_terminate_all;
698 tdev->device.copy_align = TDMA_ALIGNMENT;
699
700 dma_set_mask(&pdev->dev, DMA_BIT_MASK(64));
701 platform_set_drvdata(pdev, tdev);
702
703 ret = dma_async_device_register(&tdev->device);
704 if (ret) {
705 dev_err(tdev->device.dev, "unable to register\n");
706 return ret;
707 }
708
709 if (pdev->dev.of_node) {
710 ret = of_dma_controller_register(pdev->dev.of_node,
711 mmp_tdma_xlate, tdev);
712 if (ret) {
713 dev_err(tdev->device.dev,
714 "failed to register controller\n");
715 dma_async_device_unregister(&tdev->device);
716 }
717 }
718
719 dev_info(tdev->device.dev, "initialized\n");
720 return 0;
721 }
722
723 static const struct platform_device_id mmp_tdma_id_table[] = {
724 { "mmp-adma", MMP_AUD_TDMA },
725 { "pxa910-squ", PXA910_SQU },
726 { },
727 };
728
729 static struct platform_driver mmp_tdma_driver = {
730 .driver = {
731 .name = "mmp-tdma",
732 .of_match_table = mmp_tdma_dt_ids,
733 },
734 .id_table = mmp_tdma_id_table,
735 .probe = mmp_tdma_probe,
736 .remove = mmp_tdma_remove,
737 };
738
739 module_platform_driver(mmp_tdma_driver);
740
741 MODULE_LICENSE("GPL");
742 MODULE_DESCRIPTION("MMP Two-Channel DMA Driver");
743 MODULE_ALIAS("platform:mmp-tdma");
744 MODULE_AUTHOR("Leo Yan <leoy@marvell.com>");
745 MODULE_AUTHOR("Zhangfei Gao <zhangfei.gao@marvell.com>");
Linux with added FPC-III support