+++ /dev/null
-/*
- * dma.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/slab.h>
-#include <linux/dma-mapping.h>
-#include <linux/module.h>
-
-#include <sound/soc.h>
-#include <sound/pcm_params.h>
-
-#include <asm/dma.h>
-#include <mach/hardware.h>
-#include <mach/dma.h>
-
-#include "dma.h"
-
-#define ST_RUNNING (1<<0)
-#define ST_OPENED (1<<1)
-
-static const struct snd_pcm_hardware dma_hardware = {
- .info = SNDRV_PCM_INFO_INTERLEAVED |
- SNDRV_PCM_INFO_BLOCK_TRANSFER |
- SNDRV_PCM_INFO_MMAP |
- SNDRV_PCM_INFO_MMAP_VALID,
- .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 runtime_data {
- spinlock_t lock;
- int state;
- unsigned int dma_loaded;
- unsigned int dma_period;
- dma_addr_t dma_start;
- dma_addr_t dma_pos;
- dma_addr_t dma_end;
- struct s3c_dma_params *params;
-};
-
-static void audio_buffdone(void *data);
-
-/* dma_enqueue
- *
- * place a dma buffer onto the queue for the dma system
- * to handle.
- */
-static void dma_enqueue(struct snd_pcm_substream *substream)
-{
- struct runtime_data *prtd = substream->runtime->private_data;
- dma_addr_t pos = prtd->dma_pos;
- unsigned int limit;
- struct samsung_dma_prep dma_info;
-
- pr_debug("Entered %s\n", __func__);
-
- limit = (prtd->dma_end - prtd->dma_start) / prtd->dma_period;
-
- pr_debug("%s: loaded %d, limit %d\n",
- __func__, prtd->dma_loaded, limit);
-
- dma_info.cap = (samsung_dma_has_circular() ? DMA_CYCLIC : DMA_SLAVE);
- dma_info.direction =
- (substream->stream == SNDRV_PCM_STREAM_PLAYBACK
- ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM);
- dma_info.fp = audio_buffdone;
- dma_info.fp_param = substream;
- dma_info.period = prtd->dma_period;
- dma_info.len = prtd->dma_period*limit;
-
- if (dma_info.cap == DMA_CYCLIC) {
- dma_info.buf = pos;
- prtd->params->ops->prepare(prtd->params->ch, &dma_info);
- prtd->dma_loaded += limit;
- return;
- }
-
- while (prtd->dma_loaded < limit) {
- pr_debug("dma_loaded: %d\n", prtd->dma_loaded);
-
- if ((pos + dma_info.period) > prtd->dma_end) {
- dma_info.period = prtd->dma_end - pos;
- pr_debug("%s: corrected dma len %ld\n",
- __func__, dma_info.period);
- }
-
- dma_info.buf = pos;
- prtd->params->ops->prepare(prtd->params->ch, &dma_info);
-
- prtd->dma_loaded++;
- pos += prtd->dma_period;
- if (pos >= prtd->dma_end)
- pos = prtd->dma_start;
- }
-
- prtd->dma_pos = pos;
-}
-
-static void audio_buffdone(void *data)
-{
- struct snd_pcm_substream *substream = data;
- struct runtime_data *prtd = substream->runtime->private_data;
-
- pr_debug("Entered %s\n", __func__);
-
- if (prtd->state & ST_RUNNING) {
- prtd->dma_pos += prtd->dma_period;
- if (prtd->dma_pos >= prtd->dma_end)
- prtd->dma_pos = prtd->dma_start;
-
- if (substream)
- snd_pcm_period_elapsed(substream);
-
- spin_lock(&prtd->lock);
- if (!samsung_dma_has_circular()) {
- prtd->dma_loaded--;
- dma_enqueue(substream);
- }
- spin_unlock(&prtd->lock);
- }
-}
-
-static int dma_hw_params(struct snd_pcm_substream *substream,
- struct snd_pcm_hw_params *params)
-{
- struct snd_pcm_runtime *runtime = substream->runtime;
- struct runtime_data *prtd = runtime->private_data;
- struct snd_soc_pcm_runtime *rtd = substream->private_data;
- unsigned long totbytes = params_buffer_bytes(params);
- struct s3c_dma_params *dma =
- snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
- struct samsung_dma_req req;
- struct samsung_dma_config config;
-
- 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);
-
- prtd->params->ops = samsung_dma_get_ops();
-
- req.cap = (samsung_dma_has_circular() ?
- DMA_CYCLIC : DMA_SLAVE);
- req.client = prtd->params->client;
- config.direction =
- (substream->stream == SNDRV_PCM_STREAM_PLAYBACK
- ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM);
- config.width = prtd->params->dma_size;
- config.fifo = prtd->params->dma_addr;
- prtd->params->ch = prtd->params->ops->request(
- prtd->params->channel, &req, rtd->cpu_dai->dev,
- prtd->params->ch_name);
- if (!prtd->params->ch) {
- pr_err("Failed to allocate DMA channel\n");
- return -ENXIO;
- }
- prtd->params->ops->config(prtd->params->ch, &config);
- }
-
- snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
-
- runtime->dma_bytes = totbytes;
-
- spin_lock_irq(&prtd->lock);
- prtd->dma_loaded = 0;
- 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 dma_hw_free(struct snd_pcm_substream *substream)
-{
- struct runtime_data *prtd = substream->runtime->private_data;
-
- pr_debug("Entered %s\n", __func__);
-
- snd_pcm_set_runtime_buffer(substream, NULL);
-
- if (prtd->params) {
- prtd->params->ops->flush(prtd->params->ch);
- prtd->params->ops->release(prtd->params->ch,
- prtd->params->client);
- prtd->params = NULL;
- }
-
- return 0;
-}
-
-static int dma_prepare(struct snd_pcm_substream *substream)
-{
- struct 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;
-
- /* flush the DMA channel */
- prtd->params->ops->flush(prtd->params->ch);
-
- prtd->dma_loaded = 0;
- prtd->dma_pos = prtd->dma_start;
-
- /* enqueue dma buffers */
- dma_enqueue(substream);
-
- return ret;
-}
-
-static int dma_trigger(struct snd_pcm_substream *substream, int cmd)
-{
- struct 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:
- prtd->state |= ST_RUNNING;
- prtd->params->ops->trigger(prtd->params->ch);
- break;
-
- case SNDRV_PCM_TRIGGER_STOP:
- prtd->state &= ~ST_RUNNING;
- prtd->params->ops->stop(prtd->params->ch);
- break;
-
- default:
- ret = -EINVAL;
- break;
- }
-
- spin_unlock(&prtd->lock);
-
- return ret;
-}
-
-static snd_pcm_uframes_t
-dma_pointer(struct snd_pcm_substream *substream)
-{
- struct snd_pcm_runtime *runtime = substream->runtime;
- struct runtime_data *prtd = runtime->private_data;
- unsigned long res;
-
- pr_debug("Entered %s\n", __func__);
-
- res = prtd->dma_pos - prtd->dma_start;
-
- pr_debug("Pointer offset: %lu\n", res);
-
- /* 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
- * called... (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 dma_open(struct snd_pcm_substream *substream)
-{
- struct snd_pcm_runtime *runtime = substream->runtime;
- struct 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, &dma_hardware);
-
- prtd = kzalloc(sizeof(struct runtime_data), GFP_KERNEL);
- if (prtd == NULL)
- return -ENOMEM;
-
- spin_lock_init(&prtd->lock);
-
- runtime->private_data = prtd;
- return 0;
-}
-
-static int dma_close(struct snd_pcm_substream *substream)
-{
- struct snd_pcm_runtime *runtime = substream->runtime;
- struct runtime_data *prtd = runtime->private_data;
-
- pr_debug("Entered %s\n", __func__);
-
- if (!prtd)
- pr_debug("dma_close called with prtd == NULL\n");
-
- kfree(prtd);
-
- return 0;
-}
-
-static int 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 dma_ops = {
- .open = dma_open,
- .close = dma_close,
- .ioctl = snd_pcm_lib_ioctl,
- .hw_params = dma_hw_params,
- .hw_free = dma_hw_free,
- .prepare = dma_prepare,
- .trigger = dma_trigger,
- .pointer = dma_pointer,
- .mmap = dma_mmap,
-};
-
-static int 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 = 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 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 int dma_new(struct snd_soc_pcm_runtime *rtd)
-{
- struct snd_card *card = rtd->card->snd_card;
- struct snd_pcm *pcm = rtd->pcm;
- int ret;
-
- pr_debug("Entered %s\n", __func__);
-
- ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
- if (ret)
- return ret;
-
- if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
- ret = preallocate_dma_buffer(pcm,
- SNDRV_PCM_STREAM_PLAYBACK);
- if (ret)
- goto out;
- }
-
- if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
- ret = preallocate_dma_buffer(pcm,
- SNDRV_PCM_STREAM_CAPTURE);
- if (ret)
- goto out;
- }
-out:
- return ret;
-}
-
-static struct snd_soc_platform_driver samsung_asoc_platform = {
- .ops = &dma_ops,
- .pcm_new = dma_new,
- .pcm_free = dma_free_dma_buffers,
-};
-
-void samsung_asoc_init_dma_data(struct snd_soc_dai *dai,
- struct s3c_dma_params *playback,
- struct s3c_dma_params *capture)
-{
- snd_soc_dai_init_dma_data(dai, playback, capture);
-}
-EXPORT_SYMBOL_GPL(samsung_asoc_init_dma_data);
-
-int samsung_asoc_dma_platform_register(struct device *dev)
-{
- return devm_snd_soc_register_platform(dev, &samsung_asoc_platform);
-}
-EXPORT_SYMBOL_GPL(samsung_asoc_dma_platform_register);
-
-MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
-MODULE_DESCRIPTION("Samsung ASoC DMA Driver");
-MODULE_LICENSE("GPL");
projects / linux-beck.git / commitdiff