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Linux/sound/soc/samsung/idma.c

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

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