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

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