1 /*
2 * sound/soc/samsung/idma.c
3 *
4 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
5 * http://www.samsung.com
6 *
7 * I2S0's Internal DMA driver
8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
13 */
14 #include <linux/interrupt.h>
15 #include <linux/platform_device.h>
16 #include <linux/dma-mapping.h>
17 #include <linux/slab.h>
18 #include <linux/module.h>
19 #include <sound/pcm.h>
20 #include <sound/pcm_params.h>
21 #include <sound/soc.h>
22
23 #include "i2s.h"
24 #include "idma.h"
25 #include "dma.h"
26 #include "i2s-regs.h"
27
28 #define ST_RUNNING (1<<0)
29 #define ST_OPENED (1<<1)
30
31 static const struct snd_pcm_hardware idma_hardware = {
32 .info = SNDRV_PCM_INFO_INTERLEAVED |
33 SNDRV_PCM_INFO_BLOCK_TRANSFER |
34 SNDRV_PCM_INFO_MMAP |
35 SNDRV_PCM_INFO_MMAP_VALID |
36 SNDRV_PCM_INFO_PAUSE |
37 SNDRV_PCM_INFO_RESUME,
38 .formats = SNDRV_PCM_FMTBIT_S16_LE |
39 SNDRV_PCM_FMTBIT_U16_LE |
40 SNDRV_PCM_FMTBIT_S24_LE |
41 SNDRV_PCM_FMTBIT_U24_LE |
42 SNDRV_PCM_FMTBIT_U8 |
43 SNDRV_PCM_FMTBIT_S8,
44 .channels_min = 2,
45 .channels_max = 2,
46 .buffer_bytes_max = MAX_IDMA_BUFFER,
47 .period_bytes_min = 128,
48 .period_bytes_max = MAX_IDMA_PERIOD,
49 .periods_min = 1,
50 .periods_max = 2,
51 };
52
53 struct idma_ctrl {
54 spinlock_t lock;
55 int state;
56 dma_addr_t start;
57 dma_addr_t pos;
58 dma_addr_t end;
59 dma_addr_t period;
60 dma_addr_t periodsz;
61 void *token;
62 void (*cb)(void *dt, int bytes_xfer);
63 };
64
65 static struct idma_info {
66 spinlock_t lock;
67 void __iomem *regs;
68 dma_addr_t lp_tx_addr;
69 } idma;
70
idma_getpos(dma_addr_t * src)71 static void idma_getpos(dma_addr_t *src)
72 {
73 *src = idma.lp_tx_addr +
74 (readl(idma.regs + I2STRNCNT) & 0xffffff) * 4;
75 }
76
idma_enqueue(struct snd_pcm_substream * substream)77 static int idma_enqueue(struct snd_pcm_substream *substream)
78 {
79 struct snd_pcm_runtime *runtime = substream->runtime;
80 struct idma_ctrl *prtd = substream->runtime->private_data;
81 u32 val;
82
83 spin_lock(&prtd->lock);
84 prtd->token = (void *) substream;
85 spin_unlock(&prtd->lock);
86
87 /* Internal DMA Level0 Interrupt Address */
88 val = idma.lp_tx_addr + prtd->periodsz;
89 writel(val, idma.regs + I2SLVL0ADDR);
90
91 /* Start address0 of I2S internal DMA operation. */
92 val = idma.lp_tx_addr;
93 writel(val, idma.regs + I2SSTR0);
94
95 /*
96 * Transfer block size for I2S internal DMA.
97 * Should decide transfer size before start dma operation
98 */
99 val = readl(idma.regs + I2SSIZE);
100 val &= ~(I2SSIZE_TRNMSK << I2SSIZE_SHIFT);
101 val |= (((runtime->dma_bytes >> 2) &
102 I2SSIZE_TRNMSK) << I2SSIZE_SHIFT);
103 writel(val, idma.regs + I2SSIZE);
104
105 val = readl(idma.regs + I2SAHB);
106 val |= AHB_INTENLVL0;
107 writel(val, idma.regs + I2SAHB);
108
109 return 0;
110 }
111
idma_setcallbk(struct snd_pcm_substream * substream,void (* cb)(void *,int))112 static void idma_setcallbk(struct snd_pcm_substream *substream,
113 void (*cb)(void *, int))
114 {
115 struct idma_ctrl *prtd = substream->runtime->private_data;
116
117 spin_lock(&prtd->lock);
118 prtd->cb = cb;
119 spin_unlock(&prtd->lock);
120 }
121
idma_control(int op)122 static void idma_control(int op)
123 {
124 u32 val = readl(idma.regs + I2SAHB);
125
126 spin_lock(&idma.lock);
127
128 switch (op) {
129 case LPAM_DMA_START:
130 val |= (AHB_INTENLVL0 | AHB_DMAEN);
131 break;
132 case LPAM_DMA_STOP:
133 val &= ~(AHB_INTENLVL0 | AHB_DMAEN);
134 break;
135 default:
136 spin_unlock(&idma.lock);
137 return;
138 }
139
140 writel(val, idma.regs + I2SAHB);
141 spin_unlock(&idma.lock);
142 }
143
idma_done(void * id,int bytes_xfer)144 static void idma_done(void *id, int bytes_xfer)
145 {
146 struct snd_pcm_substream *substream = id;
147 struct idma_ctrl *prtd = substream->runtime->private_data;
148
149 if (prtd && (prtd->state & ST_RUNNING))
150 snd_pcm_period_elapsed(substream);
151 }
152
idma_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params)153 static int idma_hw_params(struct snd_pcm_substream *substream,
154 struct snd_pcm_hw_params *params)
155 {
156 struct snd_pcm_runtime *runtime = substream->runtime;
157 struct idma_ctrl *prtd = substream->runtime->private_data;
158 u32 mod = readl(idma.regs + I2SMOD);
159 u32 ahb = readl(idma.regs + I2SAHB);
160
161 ahb |= (AHB_DMARLD | AHB_INTMASK);
162 mod |= MOD_TXS_IDMA;
163 writel(ahb, idma.regs + I2SAHB);
164 writel(mod, idma.regs + I2SMOD);
165
166 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
167 runtime->dma_bytes = params_buffer_bytes(params);
168
169 prtd->start = prtd->pos = runtime->dma_addr;
170 prtd->period = params_periods(params);
171 prtd->periodsz = params_period_bytes(params);
172 prtd->end = runtime->dma_addr + runtime->dma_bytes;
173
174 idma_setcallbk(substream, idma_done);
175
176 return 0;
177 }
178
idma_hw_free(struct snd_pcm_substream * substream)179 static int idma_hw_free(struct snd_pcm_substream *substream)
180 {
181 snd_pcm_set_runtime_buffer(substream, NULL);
182
183 return 0;
184 }
185
idma_prepare(struct snd_pcm_substream * substream)186 static int idma_prepare(struct snd_pcm_substream *substream)
187 {
188 struct idma_ctrl *prtd = substream->runtime->private_data;
189
190 prtd->pos = prtd->start;
191
192 /* flush the DMA channel */
193 idma_control(LPAM_DMA_STOP);
194 idma_enqueue(substream);
195
196 return 0;
197 }
198
idma_trigger(struct snd_pcm_substream * substream,int cmd)199 static int idma_trigger(struct snd_pcm_substream *substream, int cmd)
200 {
201 struct idma_ctrl *prtd = substream->runtime->private_data;
202 int ret = 0;
203
204 spin_lock(&prtd->lock);
205
206 switch (cmd) {
207 case SNDRV_PCM_TRIGGER_RESUME:
208 case SNDRV_PCM_TRIGGER_START:
209 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
210 prtd->state |= ST_RUNNING;
211 idma_control(LPAM_DMA_START);
212 break;
213
214 case SNDRV_PCM_TRIGGER_SUSPEND:
215 case SNDRV_PCM_TRIGGER_STOP:
216 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
217 prtd->state &= ~ST_RUNNING;
218 idma_control(LPAM_DMA_STOP);
219 break;
220
221 default:
222 ret = -EINVAL;
223 break;
224 }
225
226 spin_unlock(&prtd->lock);
227
228 return ret;
229 }
230
231 static snd_pcm_uframes_t
idma_pointer(struct snd_pcm_substream * substream)232 idma_pointer(struct snd_pcm_substream *substream)
233 {
234 struct snd_pcm_runtime *runtime = substream->runtime;
235 struct idma_ctrl *prtd = runtime->private_data;
236 dma_addr_t src;
237 unsigned long res;
238
239 spin_lock(&prtd->lock);
240
241 idma_getpos(&src);
242 res = src - prtd->start;
243
244 spin_unlock(&prtd->lock);
245
246 return bytes_to_frames(substream->runtime, res);
247 }
248
idma_mmap(struct snd_pcm_substream * substream,struct vm_area_struct * vma)249 static int idma_mmap(struct snd_pcm_substream *substream,
250 struct vm_area_struct *vma)
251 {
252 struct snd_pcm_runtime *runtime = substream->runtime;
253 unsigned long size, offset;
254 int ret;
255
256 /* From snd_pcm_lib_mmap_iomem */
257 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
258 vma->vm_flags |= VM_IO;
259 size = vma->vm_end - vma->vm_start;
260 offset = vma->vm_pgoff << PAGE_SHIFT;
261 ret = io_remap_pfn_range(vma, vma->vm_start,
262 (runtime->dma_addr + offset) >> PAGE_SHIFT,
263 size, vma->vm_page_prot);
264
265 return ret;
266 }
267
iis_irq(int irqno,void * dev_id)268 static irqreturn_t iis_irq(int irqno, void *dev_id)
269 {
270 struct idma_ctrl *prtd = (struct idma_ctrl *)dev_id;
271 u32 iiscon, iisahb, val, addr;
272
273 iisahb = readl(idma.regs + I2SAHB);
274 iiscon = readl(idma.regs + I2SCON);
275
276 val = (iisahb & AHB_LVL0INT) ? AHB_CLRLVL0INT : 0;
277
278 if (val) {
279 iisahb |= val;
280 writel(iisahb, idma.regs + I2SAHB);
281
282 addr = readl(idma.regs + I2SLVL0ADDR) - idma.lp_tx_addr;
283 addr += prtd->periodsz;
284 addr %= (prtd->end - prtd->start);
285 addr += idma.lp_tx_addr;
286
287 writel(addr, idma.regs + I2SLVL0ADDR);
288
289 if (prtd->cb)
290 prtd->cb(prtd->token, prtd->period);
291 }
292
293 return IRQ_HANDLED;
294 }
295
idma_open(struct snd_pcm_substream * substream)296 static int idma_open(struct snd_pcm_substream *substream)
297 {
298 struct snd_pcm_runtime *runtime = substream->runtime;
299 struct idma_ctrl *prtd;
300 int ret;
301
302 snd_soc_set_runtime_hwparams(substream, &idma_hardware);
303
304 prtd = kzalloc(sizeof(struct idma_ctrl), GFP_KERNEL);
305 if (prtd == NULL)
306 return -ENOMEM;
307
308 ret = request_irq(IRQ_I2S0, iis_irq, 0, "i2s", prtd);
309 if (ret < 0) {
310 pr_err("fail to claim i2s irq , ret = %d\n", ret);
311 kfree(prtd);
312 return ret;
313 }
314
315 spin_lock_init(&prtd->lock);
316
317 runtime->private_data = prtd;
318
319 return 0;
320 }
321
idma_close(struct snd_pcm_substream * substream)322 static int idma_close(struct snd_pcm_substream *substream)
323 {
324 struct snd_pcm_runtime *runtime = substream->runtime;
325 struct idma_ctrl *prtd = runtime->private_data;
326
327 free_irq(IRQ_I2S0, prtd);
328
329 if (!prtd)
330 pr_err("idma_close called with prtd == NULL\n");
331
332 kfree(prtd);
333
334 return 0;
335 }
336
337 static struct snd_pcm_ops idma_ops = {
338 .open = idma_open,
339 .close = idma_close,
340 .ioctl = snd_pcm_lib_ioctl,
341 .trigger = idma_trigger,
342 .pointer = idma_pointer,
343 .mmap = idma_mmap,
344 .hw_params = idma_hw_params,
345 .hw_free = idma_hw_free,
346 .prepare = idma_prepare,
347 };
348
idma_free(struct snd_pcm * pcm)349 static void idma_free(struct snd_pcm *pcm)
350 {
351 struct snd_pcm_substream *substream;
352 struct snd_dma_buffer *buf;
353
354 substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
355 if (!substream)
356 return;
357
358 buf = &substream->dma_buffer;
359 if (!buf->area)
360 return;
361
362 iounmap(buf->area);
363
364 buf->area = NULL;
365 buf->addr = 0;
366 }
367
preallocate_idma_buffer(struct snd_pcm * pcm,int stream)368 static int preallocate_idma_buffer(struct snd_pcm *pcm, int stream)
369 {
370 struct snd_pcm_substream *substream = pcm->streams[stream].substream;
371 struct snd_dma_buffer *buf = &substream->dma_buffer;
372
373 buf->dev.dev = pcm->card->dev;
374 buf->private_data = NULL;
375
376 /* Assign PCM buffer pointers */
377 buf->dev.type = SNDRV_DMA_TYPE_CONTINUOUS;
378 buf->addr = idma.lp_tx_addr;
379 buf->bytes = idma_hardware.buffer_bytes_max;
380 buf->area = (unsigned char *)ioremap(buf->addr, buf->bytes);
381
382 return 0;
383 }
384
385 static u64 idma_mask = DMA_BIT_MASK(32);
386
idma_new(struct snd_soc_pcm_runtime * rtd)387 static int idma_new(struct snd_soc_pcm_runtime *rtd)
388 {
389 struct snd_card *card = rtd->card->snd_card;
390 struct snd_pcm *pcm = rtd->pcm;
391 int ret = 0;
392
393 if (!card->dev->dma_mask)
394 card->dev->dma_mask = &idma_mask;
395 if (!card->dev->coherent_dma_mask)
396 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
397
398 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
399 ret = preallocate_idma_buffer(pcm,
400 SNDRV_PCM_STREAM_PLAYBACK);
401 }
402
403 return ret;
404 }
405
idma_reg_addr_init(void __iomem * regs,dma_addr_t addr)406 void idma_reg_addr_init(void __iomem *regs, dma_addr_t addr)
407 {
408 spin_lock_init(&idma.lock);
409 idma.regs = regs;
410 idma.lp_tx_addr = addr;
411 }
412
413 static struct snd_soc_platform_driver asoc_idma_platform = {
414 .ops = &idma_ops,
415 .pcm_new = idma_new,
416 .pcm_free = idma_free,
417 };
418
asoc_idma_platform_probe(struct platform_device * pdev)419 static int __devinit asoc_idma_platform_probe(struct platform_device *pdev)
420 {
421 return snd_soc_register_platform(&pdev->dev, &asoc_idma_platform);
422 }
423
asoc_idma_platform_remove(struct platform_device * pdev)424 static int __devexit asoc_idma_platform_remove(struct platform_device *pdev)
425 {
426 snd_soc_unregister_platform(&pdev->dev);
427 return 0;
428 }
429
430 static struct platform_driver asoc_idma_driver = {
431 .driver = {
432 .name = "samsung-idma",
433 .owner = THIS_MODULE,
434 },
435
436 .probe = asoc_idma_platform_probe,
437 .remove = __devexit_p(asoc_idma_platform_remove),
438 };
439
440 module_platform_driver(asoc_idma_driver);
441
442 MODULE_AUTHOR("Jaswinder Singh, <jassisinghbrar@gmail.com>");
443 MODULE_DESCRIPTION("Samsung ASoC IDMA Driver");
444 MODULE_LICENSE("GPL");
445