+++ /dev/null
-/*
- * s3c24xx-pcm.c -- ALSA Soc Audio Layer
- *
- * (c) 2006 Wolfson Microelectronics PLC.
- * Graeme Gregory graeme.gregory@wolfsonmicro.com or linux@wolfsonmicro.com
- *
- * Copyright 2004-2005 Simtec Electronics
- * http://armlinux.simtec.co.uk/
- * Ben Dooks <ben@simtec.co.uk>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2 of the License, or (at your
- * option) any later version.
- */
-
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/io.h>
-#include <linux/platform_device.h>
-#include <linux/slab.h>
-#include <linux/dma-mapping.h>
-
-#include <sound/core.h>
-#include <sound/pcm.h>
-#include <sound/pcm_params.h>
-#include <sound/soc.h>
-
-#include <asm/dma.h>
-#include <mach/hardware.h>
-#include <mach/dma.h>
-
-#include "s3c24xx-pcm.h"
-
-static const struct snd_pcm_hardware s3c_dma_hardware = {
- .info = SNDRV_PCM_INFO_INTERLEAVED |
- SNDRV_PCM_INFO_BLOCK_TRANSFER |
- SNDRV_PCM_INFO_MMAP |
- SNDRV_PCM_INFO_MMAP_VALID |
- SNDRV_PCM_INFO_PAUSE |
- SNDRV_PCM_INFO_RESUME,
- .formats = SNDRV_PCM_FMTBIT_S16_LE |
- SNDRV_PCM_FMTBIT_U16_LE |
- SNDRV_PCM_FMTBIT_U8 |
- SNDRV_PCM_FMTBIT_S8,
- .channels_min = 2,
- .channels_max = 2,
- .buffer_bytes_max = 128*1024,
- .period_bytes_min = PAGE_SIZE,
- .period_bytes_max = PAGE_SIZE*2,
- .periods_min = 2,
- .periods_max = 128,
- .fifo_size = 32,
-};
-
-struct s3c24xx_runtime_data {
- spinlock_t lock;
- int state;
- unsigned int dma_loaded;
- unsigned int dma_limit;
- unsigned int dma_period;
- dma_addr_t dma_start;
- dma_addr_t dma_pos;
- dma_addr_t dma_end;
- struct s3c_dma_params *params;
-};
-
-/* s3c_dma_enqueue
- *
- * place a dma buffer onto the queue for the dma system
- * to handle.
-*/
-static void s3c_dma_enqueue(struct snd_pcm_substream *substream)
-{
- struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
- dma_addr_t pos = prtd->dma_pos;
- unsigned int limit;
- int ret;
-
- pr_debug("Entered %s\n", __func__);
-
- if (s3c_dma_has_circular()) {
- limit = (prtd->dma_end - prtd->dma_start) / prtd->dma_period;
- } else
- limit = prtd->dma_limit;
-
- pr_debug("%s: loaded %d, limit %d\n", __func__, prtd->dma_loaded, limit);
-
- while (prtd->dma_loaded < limit) {
- unsigned long len = prtd->dma_period;
-
- pr_debug("dma_loaded: %d\n", prtd->dma_loaded);
-
- if ((pos + len) > prtd->dma_end) {
- len = prtd->dma_end - pos;
- pr_debug(KERN_DEBUG "%s: corrected dma len %ld\n",
- __func__, len);
- }
-
- ret = s3c2410_dma_enqueue(prtd->params->channel,
- substream, pos, len);
-
- if (ret == 0) {
- prtd->dma_loaded++;
- pos += prtd->dma_period;
- if (pos >= prtd->dma_end)
- pos = prtd->dma_start;
- } else
- break;
- }
-
- prtd->dma_pos = pos;
-}
-
-static void s3c24xx_audio_buffdone(struct s3c2410_dma_chan *channel,
- void *dev_id, int size,
- enum s3c2410_dma_buffresult result)
-{
- struct snd_pcm_substream *substream = dev_id;
- struct s3c24xx_runtime_data *prtd;
-
- pr_debug("Entered %s\n", __func__);
-
- if (result == S3C2410_RES_ABORT || result == S3C2410_RES_ERR)
- return;
-
- prtd = substream->runtime->private_data;
-
- if (substream)
- snd_pcm_period_elapsed(substream);
-
- spin_lock(&prtd->lock);
- if (prtd->state & ST_RUNNING && !s3c_dma_has_circular()) {
- prtd->dma_loaded--;
- s3c_dma_enqueue(substream);
- }
-
- spin_unlock(&prtd->lock);
-}
-
-static int s3c_dma_hw_params(struct snd_pcm_substream *substream,
- struct snd_pcm_hw_params *params)
-{
- struct snd_pcm_runtime *runtime = substream->runtime;
- struct s3c24xx_runtime_data *prtd = runtime->private_data;
- struct snd_soc_pcm_runtime *rtd = substream->private_data;
- struct s3c_dma_params *dma = rtd->dai->cpu_dai->dma_data;
- unsigned long totbytes = params_buffer_bytes(params);
- int ret = 0;
-
- pr_debug("Entered %s\n", __func__);
-
- /* return if this is a bufferless transfer e.g.
- * codec <--> BT codec or GSM modem -- lg FIXME */
- if (!dma)
- return 0;
-
- /* this may get called several times by oss emulation
- * with different params -HW */
- if (prtd->params == NULL) {
- /* prepare DMA */
- prtd->params = dma;
-
- pr_debug("params %p, client %p, channel %d\n", prtd->params,
- prtd->params->client, prtd->params->channel);
-
- ret = s3c2410_dma_request(prtd->params->channel,
- prtd->params->client, NULL);
-
- if (ret < 0) {
- printk(KERN_ERR "failed to get dma channel\n");
- return ret;
- }
-
- /* use the circular buffering if we have it available. */
- if (s3c_dma_has_circular())
- s3c2410_dma_setflags(prtd->params->channel,
- S3C2410_DMAF_CIRCULAR);
- }
-
- s3c2410_dma_set_buffdone_fn(prtd->params->channel,
- s3c24xx_audio_buffdone);
-
- snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
-
- runtime->dma_bytes = totbytes;
-
- spin_lock_irq(&prtd->lock);
- prtd->dma_loaded = 0;
- prtd->dma_limit = runtime->hw.periods_min;
- prtd->dma_period = params_period_bytes(params);
- prtd->dma_start = runtime->dma_addr;
- prtd->dma_pos = prtd->dma_start;
- prtd->dma_end = prtd->dma_start + totbytes;
- spin_unlock_irq(&prtd->lock);
-
- return 0;
-}
-
-static int s3c_dma_hw_free(struct snd_pcm_substream *substream)
-{
- struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
-
- pr_debug("Entered %s\n", __func__);
-
- /* TODO - do we need to ensure DMA flushed */
- snd_pcm_set_runtime_buffer(substream, NULL);
-
- if (prtd->params) {
- s3c2410_dma_free(prtd->params->channel, prtd->params->client);
- prtd->params = NULL;
- }
-
- return 0;
-}
-
-static int s3c_dma_prepare(struct snd_pcm_substream *substream)
-{
- struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
- int ret = 0;
-
- pr_debug("Entered %s\n", __func__);
-
- /* return if this is a bufferless transfer e.g.
- * codec <--> BT codec or GSM modem -- lg FIXME */
- if (!prtd->params)
- return 0;
-
- /* channel needs configuring for mem=>device, increment memory addr,
- * sync to pclk, half-word transfers to the IIS-FIFO. */
- if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
- s3c2410_dma_devconfig(prtd->params->channel,
- S3C2410_DMASRC_MEM,
- prtd->params->dma_addr);
- } else {
- s3c2410_dma_devconfig(prtd->params->channel,
- S3C2410_DMASRC_HW,
- prtd->params->dma_addr);
- }
-
- s3c2410_dma_config(prtd->params->channel,
- prtd->params->dma_size);
-
- /* flush the DMA channel */
- s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_FLUSH);
- prtd->dma_loaded = 0;
- prtd->dma_pos = prtd->dma_start;
-
- /* enqueue dma buffers */
- s3c_dma_enqueue(substream);
-
- return ret;
-}
-
-static int s3c_dma_trigger(struct snd_pcm_substream *substream, int cmd)
-{
- struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
- int ret = 0;
-
- pr_debug("Entered %s\n", __func__);
-
- spin_lock(&prtd->lock);
-
- switch (cmd) {
- case SNDRV_PCM_TRIGGER_START:
- case SNDRV_PCM_TRIGGER_RESUME:
- case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
- prtd->state |= ST_RUNNING;
- s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_START);
- break;
-
- case SNDRV_PCM_TRIGGER_STOP:
- case SNDRV_PCM_TRIGGER_SUSPEND:
- case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
- prtd->state &= ~ST_RUNNING;
- s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_STOP);
- break;
-
- default:
- ret = -EINVAL;
- break;
- }
-
- spin_unlock(&prtd->lock);
-
- return ret;
-}
-
-static snd_pcm_uframes_t
-s3c_dma_pointer(struct snd_pcm_substream *substream)
-{
- struct snd_pcm_runtime *runtime = substream->runtime;
- struct s3c24xx_runtime_data *prtd = runtime->private_data;
- unsigned long res;
- dma_addr_t src, dst;
-
- pr_debug("Entered %s\n", __func__);
-
- spin_lock(&prtd->lock);
- s3c2410_dma_getposition(prtd->params->channel, &src, &dst);
-
- if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
- res = dst - prtd->dma_start;
- else
- res = src - prtd->dma_start;
-
- spin_unlock(&prtd->lock);
-
- pr_debug("Pointer %x %x\n", src, dst);
-
- /* we seem to be getting the odd error from the pcm library due
- * to out-of-bounds pointers. this is maybe due to the dma engine
- * not having loaded the new values for the channel before being
- * callled... (todo - fix )
- */
-
- if (res >= snd_pcm_lib_buffer_bytes(substream)) {
- if (res == snd_pcm_lib_buffer_bytes(substream))
- res = 0;
- }
-
- return bytes_to_frames(substream->runtime, res);
-}
-
-static int s3c_dma_open(struct snd_pcm_substream *substream)
-{
- struct snd_pcm_runtime *runtime = substream->runtime;
- struct s3c24xx_runtime_data *prtd;
-
- pr_debug("Entered %s\n", __func__);
-
- snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
- snd_soc_set_runtime_hwparams(substream, &s3c_dma_hardware);
-
- prtd = kzalloc(sizeof(struct s3c24xx_runtime_data), GFP_KERNEL);
- if (prtd == NULL)
- return -ENOMEM;
-
- spin_lock_init(&prtd->lock);
-
- runtime->private_data = prtd;
- return 0;
-}
-
-static int s3c_dma_close(struct snd_pcm_substream *substream)
-{
- struct snd_pcm_runtime *runtime = substream->runtime;
- struct s3c24xx_runtime_data *prtd = runtime->private_data;
-
- pr_debug("Entered %s\n", __func__);
-
- if (!prtd)
- pr_debug("s3c_dma_close called with prtd == NULL\n");
-
- kfree(prtd);
-
- return 0;
-}
-
-static int s3c_dma_mmap(struct snd_pcm_substream *substream,
- struct vm_area_struct *vma)
-{
- struct snd_pcm_runtime *runtime = substream->runtime;
-
- pr_debug("Entered %s\n", __func__);
-
- return dma_mmap_writecombine(substream->pcm->card->dev, vma,
- runtime->dma_area,
- runtime->dma_addr,
- runtime->dma_bytes);
-}
-
-static struct snd_pcm_ops s3c_dma_ops = {
- .open = s3c_dma_open,
- .close = s3c_dma_close,
- .ioctl = snd_pcm_lib_ioctl,
- .hw_params = s3c_dma_hw_params,
- .hw_free = s3c_dma_hw_free,
- .prepare = s3c_dma_prepare,
- .trigger = s3c_dma_trigger,
- .pointer = s3c_dma_pointer,
- .mmap = s3c_dma_mmap,
-};
-
-static int s3c_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
-{
- struct snd_pcm_substream *substream = pcm->streams[stream].substream;
- struct snd_dma_buffer *buf = &substream->dma_buffer;
- size_t size = s3c_dma_hardware.buffer_bytes_max;
-
- pr_debug("Entered %s\n", __func__);
-
- buf->dev.type = SNDRV_DMA_TYPE_DEV;
- buf->dev.dev = pcm->card->dev;
- buf->private_data = NULL;
- buf->area = dma_alloc_writecombine(pcm->card->dev, size,
- &buf->addr, GFP_KERNEL);
- if (!buf->area)
- return -ENOMEM;
- buf->bytes = size;
- return 0;
-}
-
-static void s3c_dma_free_dma_buffers(struct snd_pcm *pcm)
-{
- struct snd_pcm_substream *substream;
- struct snd_dma_buffer *buf;
- int stream;
-
- pr_debug("Entered %s\n", __func__);
-
- for (stream = 0; stream < 2; stream++) {
- substream = pcm->streams[stream].substream;
- if (!substream)
- continue;
-
- buf = &substream->dma_buffer;
- if (!buf->area)
- continue;
-
- dma_free_writecombine(pcm->card->dev, buf->bytes,
- buf->area, buf->addr);
- buf->area = NULL;
- }
-}
-
-static u64 s3c_dma_mask = DMA_BIT_MASK(32);
-
-static int s3c_dma_new(struct snd_card *card,
- struct snd_soc_dai *dai, struct snd_pcm *pcm)
-{
- int ret = 0;
-
- pr_debug("Entered %s\n", __func__);
-
- if (!card->dev->dma_mask)
- card->dev->dma_mask = &s3c_dma_mask;
- if (!card->dev->coherent_dma_mask)
- card->dev->coherent_dma_mask = 0xffffffff;
-
- if (dai->playback.channels_min) {
- ret = s3c_preallocate_dma_buffer(pcm,
- SNDRV_PCM_STREAM_PLAYBACK);
- if (ret)
- goto out;
- }
-
- if (dai->capture.channels_min) {
- ret = s3c_preallocate_dma_buffer(pcm,
- SNDRV_PCM_STREAM_CAPTURE);
- if (ret)
- goto out;
- }
- out:
- return ret;
-}
-
-struct snd_soc_platform s3c24xx_soc_platform = {
- .name = "s3c24xx-audio",
- .pcm_ops = &s3c_dma_ops,
- .pcm_new = s3c_dma_new,
- .pcm_free = s3c_dma_free_dma_buffers,
-};
-EXPORT_SYMBOL_GPL(s3c24xx_soc_platform);
-
-static int __init s3c24xx_soc_platform_init(void)
-{
- return snd_soc_register_platform(&s3c24xx_soc_platform);
-}
-module_init(s3c24xx_soc_platform_init);
-
-static void __exit s3c24xx_soc_platform_exit(void)
-{
- snd_soc_unregister_platform(&s3c24xx_soc_platform);
-}
-module_exit(s3c24xx_soc_platform_exit);
-
-MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
-MODULE_DESCRIPTION("Samsung S3C Audio DMA module");
-MODULE_LICENSE("GPL");
git.openpandora.org / pandora-kernel.git / blobdiff