2 * sound/soc/samsung/idma.c
4 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
5 * http://www.samsung.com
7 * I2S0's Internal DMA driver
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.
14 #include <linux/interrupt.h>
15 #include <linux/platform_device.h>
16 #include <linux/dma-mapping.h>
17 #include <linux/slab.h>
18 #include <sound/pcm.h>
19 #include <sound/pcm_params.h>
20 #include <sound/soc.h>
27 #define ST_RUNNING (1<<0)
28 #define ST_OPENED (1<<1)
30 static const struct snd_pcm_hardware idma_hardware = {
31 .info = SNDRV_PCM_INFO_INTERLEAVED |
32 SNDRV_PCM_INFO_BLOCK_TRANSFER |
34 SNDRV_PCM_INFO_MMAP_VALID |
35 SNDRV_PCM_INFO_PAUSE |
36 SNDRV_PCM_INFO_RESUME,
37 .formats = SNDRV_PCM_FMTBIT_S16_LE |
38 SNDRV_PCM_FMTBIT_U16_LE |
39 SNDRV_PCM_FMTBIT_S24_LE |
40 SNDRV_PCM_FMTBIT_U24_LE |
45 .buffer_bytes_max = MAX_IDMA_BUFFER,
46 .period_bytes_min = 128,
47 .period_bytes_max = MAX_IDMA_PERIOD,
61 void (*cb)(void *dt, int bytes_xfer);
64 static struct idma_info {
67 dma_addr_t lp_tx_addr;
70 static void idma_getpos(dma_addr_t *src)
72 *src = idma.lp_tx_addr +
73 (readl(idma.regs + I2STRNCNT) & 0xffffff) * 4;
76 static int idma_enqueue(struct snd_pcm_substream *substream)
78 struct snd_pcm_runtime *runtime = substream->runtime;
79 struct idma_ctrl *prtd = substream->runtime->private_data;
82 spin_lock(&prtd->lock);
83 prtd->token = (void *) substream;
84 spin_unlock(&prtd->lock);
86 /* Internal DMA Level0 Interrupt Address */
87 val = idma.lp_tx_addr + prtd->periodsz;
88 writel(val, idma.regs + I2SLVL0ADDR);
90 /* Start address0 of I2S internal DMA operation. */
91 val = idma.lp_tx_addr;
92 writel(val, idma.regs + I2SSTR0);
95 * Transfer block size for I2S internal DMA.
96 * Should decide transfer size before start dma operation
98 val = readl(idma.regs + I2SSIZE);
99 val &= ~(I2SSIZE_TRNMSK << I2SSIZE_SHIFT);
100 val |= (((runtime->dma_bytes >> 2) &
101 I2SSIZE_TRNMSK) << I2SSIZE_SHIFT);
102 writel(val, idma.regs + I2SSIZE);
104 val = readl(idma.regs + I2SAHB);
105 val |= AHB_INTENLVL0;
106 writel(val, idma.regs + I2SAHB);
111 static void idma_setcallbk(struct snd_pcm_substream *substream,
112 void (*cb)(void *, int))
114 struct idma_ctrl *prtd = substream->runtime->private_data;
116 spin_lock(&prtd->lock);
118 spin_unlock(&prtd->lock);
121 static void idma_control(int op)
123 u32 val = readl(idma.regs + I2SAHB);
125 spin_lock(&idma.lock);
129 val |= (AHB_INTENLVL0 | AHB_DMAEN);
132 val &= ~(AHB_INTENLVL0 | AHB_DMAEN);
135 spin_unlock(&idma.lock);
139 writel(val, idma.regs + I2SAHB);
140 spin_unlock(&idma.lock);
143 static void idma_done(void *id, int bytes_xfer)
145 struct snd_pcm_substream *substream = id;
146 struct idma_ctrl *prtd = substream->runtime->private_data;
148 if (prtd && (prtd->state & ST_RUNNING))
149 snd_pcm_period_elapsed(substream);
152 static int idma_hw_params(struct snd_pcm_substream *substream,
153 struct snd_pcm_hw_params *params)
155 struct snd_pcm_runtime *runtime = substream->runtime;
156 struct idma_ctrl *prtd = substream->runtime->private_data;
157 u32 mod = readl(idma.regs + I2SMOD);
158 u32 ahb = readl(idma.regs + I2SAHB);
160 ahb |= (AHB_DMARLD | AHB_INTMASK);
162 writel(ahb, idma.regs + I2SAHB);
163 writel(mod, idma.regs + I2SMOD);
165 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
166 runtime->dma_bytes = params_buffer_bytes(params);
168 prtd->start = prtd->pos = runtime->dma_addr;
169 prtd->period = params_periods(params);
170 prtd->periodsz = params_period_bytes(params);
171 prtd->end = runtime->dma_addr + runtime->dma_bytes;
173 idma_setcallbk(substream, idma_done);
178 static int idma_hw_free(struct snd_pcm_substream *substream)
180 snd_pcm_set_runtime_buffer(substream, NULL);
185 static int idma_prepare(struct snd_pcm_substream *substream)
187 struct idma_ctrl *prtd = substream->runtime->private_data;
189 prtd->pos = prtd->start;
191 /* flush the DMA channel */
192 idma_control(LPAM_DMA_STOP);
193 idma_enqueue(substream);
198 static int idma_trigger(struct snd_pcm_substream *substream, int cmd)
200 struct idma_ctrl *prtd = substream->runtime->private_data;
203 spin_lock(&prtd->lock);
206 case SNDRV_PCM_TRIGGER_RESUME:
207 case SNDRV_PCM_TRIGGER_START:
208 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
209 prtd->state |= ST_RUNNING;
210 idma_control(LPAM_DMA_START);
213 case SNDRV_PCM_TRIGGER_SUSPEND:
214 case SNDRV_PCM_TRIGGER_STOP:
215 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
216 prtd->state &= ~ST_RUNNING;
217 idma_control(LPAM_DMA_STOP);
225 spin_unlock(&prtd->lock);
230 static snd_pcm_uframes_t
231 idma_pointer(struct snd_pcm_substream *substream)
233 struct snd_pcm_runtime *runtime = substream->runtime;
234 struct idma_ctrl *prtd = runtime->private_data;
238 spin_lock(&prtd->lock);
241 res = src - prtd->start;
243 spin_unlock(&prtd->lock);
245 return bytes_to_frames(substream->runtime, res);
248 static int idma_mmap(struct snd_pcm_substream *substream,
249 struct vm_area_struct *vma)
251 struct snd_pcm_runtime *runtime = substream->runtime;
252 unsigned long size, offset;
255 /* From snd_pcm_lib_mmap_iomem */
256 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
257 vma->vm_flags |= VM_IO;
258 size = vma->vm_end - vma->vm_start;
259 offset = vma->vm_pgoff << PAGE_SHIFT;
260 ret = io_remap_pfn_range(vma, vma->vm_start,
261 (runtime->dma_addr + offset) >> PAGE_SHIFT,
262 size, vma->vm_page_prot);
267 static irqreturn_t iis_irq(int irqno, void *dev_id)
269 struct idma_ctrl *prtd = (struct idma_ctrl *)dev_id;
270 u32 iiscon, iisahb, val, addr;
272 iisahb = readl(idma.regs + I2SAHB);
273 iiscon = readl(idma.regs + I2SCON);
275 val = (iisahb & AHB_LVL0INT) ? AHB_CLRLVL0INT : 0;
279 writel(iisahb, idma.regs + I2SAHB);
281 addr = readl(idma.regs + I2SLVL0ADDR) - idma.lp_tx_addr;
282 addr += prtd->periodsz;
283 addr %= (prtd->end - prtd->start);
284 addr += idma.lp_tx_addr;
286 writel(addr, idma.regs + I2SLVL0ADDR);
289 prtd->cb(prtd->token, prtd->period);
295 static int idma_open(struct snd_pcm_substream *substream)
297 struct snd_pcm_runtime *runtime = substream->runtime;
298 struct idma_ctrl *prtd;
301 snd_soc_set_runtime_hwparams(substream, &idma_hardware);
303 prtd = kzalloc(sizeof(struct idma_ctrl), GFP_KERNEL);
307 ret = request_irq(IRQ_I2S0, iis_irq, 0, "i2s", prtd);
309 pr_err("fail to claim i2s irq , ret = %d\n", ret);
314 spin_lock_init(&prtd->lock);
316 runtime->private_data = prtd;
321 static int idma_close(struct snd_pcm_substream *substream)
323 struct snd_pcm_runtime *runtime = substream->runtime;
324 struct idma_ctrl *prtd = runtime->private_data;
326 free_irq(IRQ_I2S0, prtd);
329 pr_err("idma_close called with prtd == NULL\n");
336 static struct snd_pcm_ops idma_ops = {
339 .ioctl = snd_pcm_lib_ioctl,
340 .trigger = idma_trigger,
341 .pointer = idma_pointer,
343 .hw_params = idma_hw_params,
344 .hw_free = idma_hw_free,
345 .prepare = idma_prepare,
348 static void idma_free(struct snd_pcm *pcm)
350 struct snd_pcm_substream *substream;
351 struct snd_dma_buffer *buf;
353 substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
357 buf = &substream->dma_buffer;
367 static int preallocate_idma_buffer(struct snd_pcm *pcm, int stream)
369 struct snd_pcm_substream *substream = pcm->streams[stream].substream;
370 struct snd_dma_buffer *buf = &substream->dma_buffer;
372 buf->dev.dev = pcm->card->dev;
373 buf->private_data = NULL;
375 /* Assign PCM buffer pointers */
376 buf->dev.type = SNDRV_DMA_TYPE_CONTINUOUS;
377 buf->addr = idma.lp_tx_addr;
378 buf->bytes = idma_hardware.buffer_bytes_max;
379 buf->area = (unsigned char *)ioremap(buf->addr, buf->bytes);
384 static u64 idma_mask = DMA_BIT_MASK(32);
386 static int idma_new(struct snd_soc_pcm_runtime *rtd)
388 struct snd_card *card = rtd->card->snd_card;
389 struct snd_soc_dai *dai = rtd->cpu_dai;
390 struct snd_pcm *pcm = rtd->pcm;
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);
398 if (dai->driver->playback.channels_min)
399 ret = preallocate_idma_buffer(pcm,
400 SNDRV_PCM_STREAM_PLAYBACK);
405 void idma_reg_addr_init(void *regs, dma_addr_t addr)
407 spin_lock_init(&idma.lock);
409 idma.lp_tx_addr = addr;
412 struct snd_soc_platform_driver asoc_idma_platform = {
415 .pcm_free = idma_free,
418 static int __devinit asoc_idma_platform_probe(struct platform_device *pdev)
420 return snd_soc_register_platform(&pdev->dev, &asoc_idma_platform);
423 static int __devexit asoc_idma_platform_remove(struct platform_device *pdev)
425 snd_soc_unregister_platform(&pdev->dev);
429 static struct platform_driver asoc_idma_driver = {
431 .name = "samsung-idma",
432 .owner = THIS_MODULE,
435 .probe = asoc_idma_platform_probe,
436 .remove = __devexit_p(asoc_idma_platform_remove),
439 static int __init asoc_idma_init(void)
441 return platform_driver_register(&asoc_idma_driver);
443 module_init(asoc_idma_init);
445 static void __exit asoc_idma_exit(void)
447 platform_driver_unregister(&asoc_idma_driver);
449 module_exit(asoc_idma_exit);
451 MODULE_AUTHOR("Jaswinder Singh, <jassisinghbrar@gmail.com>");
452 MODULE_DESCRIPTION("Samsung ASoC IDMA Driver");
453 MODULE_LICENSE("GPL");