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* ALSA PCM interface for the TI DAVINCI processor
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* Author: Vladimir Barinov, <vbarinov@embeddedalley.com>
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* Copyright: (C) 2007 MontaVista Software, Inc., <source@mvista.com>
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* added SRAM ping/pong (C) 2008 Troy Kisky <troy.kisky@boundarydevices.com>
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/dma-mapping.h>
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#include <linux/kernel.h>
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#include <sound/core.h>
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#include <sound/pcm.h>
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#include <sound/pcm_params.h>
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#include <sound/soc.h>
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#include <mach/edma.h>
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#include <mach/sram.h>
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#include "davinci-pcm.h"
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static void print_buf_info(int slot, char *name)
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struct edmacc_param p;
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edma_read_slot(slot, &p);
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printk(KERN_DEBUG "%s: 0x%x, opt=%x, src=%x, a_b_cnt=%x dst=%x\n",
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name, slot, p.opt, p.src, p.a_b_cnt, p.dst);
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printk(KERN_DEBUG " src_dst_bidx=%x link_bcntrld=%x src_dst_cidx=%x ccnt=%x\n",
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p.src_dst_bidx, p.link_bcntrld, p.src_dst_cidx, p.ccnt);
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static void print_buf_info(int slot, char *name)
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#define DAVINCI_PCM_FMTBITS (\
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SNDRV_PCM_FMTBIT_S8 |\
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SNDRV_PCM_FMTBIT_U8 |\
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SNDRV_PCM_FMTBIT_S16_LE |\
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SNDRV_PCM_FMTBIT_S16_BE |\
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SNDRV_PCM_FMTBIT_U16_LE |\
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SNDRV_PCM_FMTBIT_U16_BE |\
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SNDRV_PCM_FMTBIT_S24_LE |\
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SNDRV_PCM_FMTBIT_S24_BE |\
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SNDRV_PCM_FMTBIT_U24_LE |\
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SNDRV_PCM_FMTBIT_U24_BE |\
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SNDRV_PCM_FMTBIT_S32_LE |\
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SNDRV_PCM_FMTBIT_S32_BE |\
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SNDRV_PCM_FMTBIT_U32_LE |\
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SNDRV_PCM_FMTBIT_U32_BE)
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static struct snd_pcm_hardware pcm_hardware_playback = {
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.info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
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SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
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SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME|
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SNDRV_PCM_INFO_BATCH),
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.formats = DAVINCI_PCM_FMTBITS,
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.rates = (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 |
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SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 |
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SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 |
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SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000 |
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.buffer_bytes_max = 128 * 1024,
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.period_bytes_min = 32,
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.period_bytes_max = 8 * 1024,
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static struct snd_pcm_hardware pcm_hardware_capture = {
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.info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
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SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
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SNDRV_PCM_INFO_PAUSE |
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SNDRV_PCM_INFO_BATCH),
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.formats = DAVINCI_PCM_FMTBITS,
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.rates = (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 |
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SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 |
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SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 |
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SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000 |
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.buffer_bytes_max = 128 * 1024,
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.period_bytes_min = 32,
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.period_bytes_max = 8 * 1024,
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* How ping/pong works....
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* ram_params - copys 2*ping_size from start of SDRAM to iram,
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* ram_link2 - copys rest of SDRAM to iram in ping_size units,
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* ram_link - copys entire SDRAM to iram in ping_size uints,
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* asp_params - same as asp_link[0]
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* asp_link[0] - copys from lower half of iram to asp port
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* links to asp_link[1], triggers iram copy event on completion
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* asp_link[1] - copys from upper half of iram to asp port
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* links to asp_link[0], triggers iram copy event on completion
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* triggers interrupt only needed to let upper SOC levels update position
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* in stream on completion
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* When playback is started:
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* ram_params - same as ram_link,
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* ram_link - same as playback
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* asp_params - same as playback
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* asp_link[0] - same as playback
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* asp_link[1] - same as playback
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* When capture is started:
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struct davinci_runtime_data {
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int period; /* current DMA period */
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int asp_channel; /* Master DMA channel */
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int asp_link[2]; /* asp parameter link channel, ping/pong */
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struct davinci_pcm_dma_params *params; /* DMA params */
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struct edmacc_param asp_params;
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struct edmacc_param ram_params;
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static void davinci_pcm_period_elapsed(struct snd_pcm_substream *substream)
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struct davinci_runtime_data *prtd = substream->runtime->private_data;
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struct snd_pcm_runtime *runtime = substream->runtime;
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if (unlikely(prtd->period >= runtime->periods))
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static void davinci_pcm_period_reset(struct snd_pcm_substream *substream)
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struct davinci_runtime_data *prtd = substream->runtime->private_data;
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* Not used with ping/pong
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static void davinci_pcm_enqueue_dma(struct snd_pcm_substream *substream)
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struct davinci_runtime_data *prtd = substream->runtime->private_data;
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struct snd_pcm_runtime *runtime = substream->runtime;
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unsigned int period_size;
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unsigned int dma_offset;
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unsigned short src_bidx, dst_bidx;
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unsigned short src_cidx, dst_cidx;
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unsigned int data_type;
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unsigned int fifo_level;
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period_size = snd_pcm_lib_period_bytes(substream);
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dma_offset = prtd->period * period_size;
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dma_pos = runtime->dma_addr + dma_offset;
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fifo_level = prtd->params->fifo_level;
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pr_debug("davinci_pcm: audio_set_dma_params_play channel = %d "
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"dma_ptr = %x period_size=%x\n", prtd->asp_link[0], dma_pos,
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data_type = prtd->params->data_type;
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count = period_size / data_type;
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
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dst = prtd->params->dma_addr;
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src_bidx = data_type;
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src_cidx = data_type * fifo_level;
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src = prtd->params->dma_addr;
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dst_bidx = data_type;
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dst_cidx = data_type * fifo_level;
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acnt = prtd->params->acnt;
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edma_set_src(prtd->asp_link[0], src, INCR, W8BIT);
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edma_set_dest(prtd->asp_link[0], dst, INCR, W8BIT);
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edma_set_src_index(prtd->asp_link[0], src_bidx, src_cidx);
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edma_set_dest_index(prtd->asp_link[0], dst_bidx, dst_cidx);
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edma_set_transfer_params(prtd->asp_link[0], acnt, count, 1, 0,
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edma_set_transfer_params(prtd->asp_link[0], acnt, fifo_level,
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static void davinci_pcm_dma_irq(unsigned link, u16 ch_status, void *data)
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struct snd_pcm_substream *substream = data;
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struct davinci_runtime_data *prtd = substream->runtime->private_data;
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print_buf_info(prtd->ram_channel, "i ram_channel");
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pr_debug("davinci_pcm: link=%d, status=0x%x\n", link, ch_status);
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if (unlikely(ch_status != DMA_COMPLETE))
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if (snd_pcm_running(substream)) {
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spin_lock(&prtd->lock);
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if (prtd->ram_channel < 0) {
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/* No ping/pong must fix up link dma data*/
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davinci_pcm_enqueue_dma(substream);
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davinci_pcm_period_elapsed(substream);
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spin_unlock(&prtd->lock);
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snd_pcm_period_elapsed(substream);
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static int allocate_sram(struct snd_pcm_substream *substream, unsigned size,
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struct snd_pcm_hardware *ppcm)
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struct snd_dma_buffer *buf = &substream->dma_buffer;
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struct snd_dma_buffer *iram_dma = NULL;
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dma_addr_t iram_phys = 0;
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void *iram_virt = NULL;
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if (buf->private_data || !size)
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ppcm->period_bytes_max = size;
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iram_virt = sram_alloc(size, &iram_phys);
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iram_dma = kzalloc(sizeof(*iram_dma), GFP_KERNEL);
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iram_dma->area = iram_virt;
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iram_dma->addr = iram_phys;
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memset(iram_dma->area, 0, size);
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iram_dma->bytes = size;
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buf->private_data = iram_dma;
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sram_free(iram_virt, size);
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* Only used with ping/pong.
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* This is called after runtime->dma_addr, period_bytes and data_type are valid
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static int ping_pong_dma_setup(struct snd_pcm_substream *substream)
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unsigned short ram_src_cidx, ram_dst_cidx;
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct davinci_runtime_data *prtd = runtime->private_data;
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struct snd_dma_buffer *iram_dma =
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(struct snd_dma_buffer *)substream->dma_buffer.private_data;
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struct davinci_pcm_dma_params *params = prtd->params;
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unsigned int data_type = params->data_type;
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unsigned int acnt = params->acnt;
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/* divide by 2 for ping/pong */
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unsigned int ping_size = snd_pcm_lib_period_bytes(substream) >> 1;
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unsigned int fifo_level = prtd->params->fifo_level;
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if ((data_type == 0) || (data_type > 4)) {
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printk(KERN_ERR "%s: data_type=%i\n", __func__, data_type);
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
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dma_addr_t asp_src_pong = iram_dma->addr + ping_size;
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ram_src_cidx = ping_size;
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ram_dst_cidx = -ping_size;
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edma_set_src(prtd->asp_link[1], asp_src_pong, INCR, W8BIT);
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edma_set_src_index(prtd->asp_link[0], data_type,
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data_type * fifo_level);
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edma_set_src_index(prtd->asp_link[1], data_type,
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data_type * fifo_level);
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edma_set_src(prtd->ram_link, runtime->dma_addr, INCR, W32BIT);
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dma_addr_t asp_dst_pong = iram_dma->addr + ping_size;
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ram_src_cidx = -ping_size;
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ram_dst_cidx = ping_size;
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edma_set_dest(prtd->asp_link[1], asp_dst_pong, INCR, W8BIT);
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edma_set_dest_index(prtd->asp_link[0], data_type,
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data_type * fifo_level);
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edma_set_dest_index(prtd->asp_link[1], data_type,
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data_type * fifo_level);
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edma_set_dest(prtd->ram_link, runtime->dma_addr, INCR, W32BIT);
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count = ping_size / data_type;
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edma_set_transfer_params(prtd->asp_link[0], acnt, count,
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edma_set_transfer_params(prtd->asp_link[1], acnt, count,
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count = ping_size / (data_type * fifo_level);
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edma_set_transfer_params(prtd->asp_link[0], acnt, fifo_level,
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count, fifo_level, ABSYNC);
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edma_set_transfer_params(prtd->asp_link[1], acnt, fifo_level,
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count, fifo_level, ABSYNC);
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edma_set_src_index(prtd->ram_link, ping_size, ram_src_cidx);
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edma_set_dest_index(prtd->ram_link, ping_size, ram_dst_cidx);
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edma_set_transfer_params(prtd->ram_link, ping_size, 2,
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runtime->periods, 2, ASYNC);
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/* init master params */
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edma_read_slot(prtd->asp_link[0], &prtd->asp_params);
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edma_read_slot(prtd->ram_link, &prtd->ram_params);
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
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struct edmacc_param p_ram;
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/* Copy entire iram buffer before playback started */
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prtd->ram_params.a_b_cnt = (1 << 16) | (ping_size << 1);
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prtd->ram_params.src_dst_bidx = (ping_size << 1);
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prtd->ram_params.src_dst_cidx = (ping_size << 1);
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prtd->ram_params.ccnt = 1;
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/* Skip 1st period */
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edma_read_slot(prtd->ram_link, &p_ram);
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p_ram.src += (ping_size << 1);
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edma_write_slot(prtd->ram_link2, &p_ram);
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* When 1st started, ram -> iram dma channel will fill the
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* entire iram. Then, whenever a ping/pong asp buffer finishes,
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* 1/2 iram will be filled.
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prtd->ram_params.link_bcntrld =
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EDMA_CHAN_SLOT(prtd->ram_link2) << 5;
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/* 1 asp tx or rx channel using 2 parameter channels
391
* 1 ram to/from iram channel using 1 parameter channel
394
* ram copy channel kicks off first,
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* 1st ram copy of entire iram buffer completion kicks off asp channel
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* asp tcc always kicks off ram copy of 1/2 iram buffer
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* asp channel starts, tcc kicks off ram copy
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static int request_ping_pong(struct snd_pcm_substream *substream,
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struct davinci_runtime_data *prtd,
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struct snd_dma_buffer *iram_dma)
405
dma_addr_t asp_src_ping;
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dma_addr_t asp_dst_ping;
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struct davinci_pcm_dma_params *params = prtd->params;
410
/* Request ram master channel */
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ret = prtd->ram_channel = edma_alloc_channel(EDMA_CHANNEL_ANY,
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davinci_pcm_dma_irq, substream,
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prtd->params->ram_chan_q);
417
/* Request ram link channel */
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ret = prtd->ram_link = edma_alloc_slot(
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EDMA_CTLR(prtd->ram_channel), EDMA_SLOT_ANY);
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ret = prtd->asp_link[1] = edma_alloc_slot(
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EDMA_CTLR(prtd->asp_channel), EDMA_SLOT_ANY);
428
prtd->ram_link2 = -1;
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
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ret = prtd->ram_link2 = edma_alloc_slot(
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EDMA_CTLR(prtd->ram_channel), EDMA_SLOT_ANY);
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/* circle ping-pong buffers */
436
edma_link(prtd->asp_link[0], prtd->asp_link[1]);
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edma_link(prtd->asp_link[1], prtd->asp_link[0]);
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/* circle ram buffers */
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edma_link(prtd->ram_link, prtd->ram_link);
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
442
asp_src_ping = iram_dma->addr;
443
asp_dst_ping = params->dma_addr; /* fifo */
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asp_src_ping = params->dma_addr; /* fifo */
446
asp_dst_ping = iram_dma->addr;
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edma_set_src(prtd->asp_link[0], asp_src_ping, INCR, W16BIT);
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edma_set_dest(prtd->asp_link[0], asp_dst_ping, INCR, W16BIT);
451
edma_set_src_index(prtd->asp_link[0], 0, 0);
452
edma_set_dest_index(prtd->asp_link[0], 0, 0);
454
edma_read_slot(prtd->asp_link[0], &prtd->asp_params);
455
prtd->asp_params.opt &= ~(TCCMODE | EDMA_TCC(0x3f) | TCINTEN);
456
prtd->asp_params.opt |= TCCHEN |
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EDMA_TCC(prtd->ram_channel & 0x3f);
458
edma_write_slot(prtd->asp_link[0], &prtd->asp_params);
461
edma_set_src(prtd->asp_link[1], asp_src_ping, INCR, W16BIT);
462
edma_set_dest(prtd->asp_link[1], asp_dst_ping, INCR, W16BIT);
463
edma_set_src_index(prtd->asp_link[1], 0, 0);
464
edma_set_dest_index(prtd->asp_link[1], 0, 0);
466
edma_read_slot(prtd->asp_link[1], &prtd->asp_params);
467
prtd->asp_params.opt &= ~(TCCMODE | EDMA_TCC(0x3f));
468
/* interrupt after every pong completion */
469
prtd->asp_params.opt |= TCINTEN | TCCHEN |
470
EDMA_TCC(prtd->ram_channel & 0x3f);
471
edma_write_slot(prtd->asp_link[1], &prtd->asp_params);
474
edma_set_src(prtd->ram_link, iram_dma->addr, INCR, W32BIT);
475
edma_set_dest(prtd->ram_link, iram_dma->addr, INCR, W32BIT);
476
pr_debug("%s: audio dma channels/slots in use for ram:%u %u %u,"
477
"for asp:%u %u %u\n", __func__,
478
prtd->ram_channel, prtd->ram_link, prtd->ram_link2,
479
prtd->asp_channel, prtd->asp_link[0],
483
edma_free_channel(prtd->asp_link[1]);
484
prtd->asp_link[1] = -1;
486
edma_free_channel(prtd->ram_link);
489
edma_free_channel(prtd->ram_channel);
490
prtd->ram_channel = -1;
495
static int davinci_pcm_dma_request(struct snd_pcm_substream *substream)
497
struct snd_dma_buffer *iram_dma;
498
struct davinci_runtime_data *prtd = substream->runtime->private_data;
499
struct davinci_pcm_dma_params *params = prtd->params;
505
/* Request asp master DMA channel */
506
ret = prtd->asp_channel = edma_alloc_channel(params->channel,
507
davinci_pcm_dma_irq, substream,
508
prtd->params->asp_chan_q);
512
/* Request asp link channels */
513
ret = prtd->asp_link[0] = edma_alloc_slot(
514
EDMA_CTLR(prtd->asp_channel), EDMA_SLOT_ANY);
518
iram_dma = (struct snd_dma_buffer *)substream->dma_buffer.private_data;
520
if (request_ping_pong(substream, prtd, iram_dma) == 0)
522
printk(KERN_WARNING "%s: dma channel allocation failed,"
523
"not using sram\n", __func__);
526
/* Issue transfer completion IRQ when the channel completes a
527
* transfer, then always reload from the same slot (by a kind
528
* of loopback link). The completion IRQ handler will update
529
* the reload slot with a new buffer.
531
* REVISIT save p_ram here after setting up everything except
532
* the buffer and its length (ccnt) ... use it as a template
533
* so davinci_pcm_enqueue_dma() takes less time in IRQ.
535
edma_read_slot(prtd->asp_link[0], &prtd->asp_params);
536
prtd->asp_params.opt |= TCINTEN |
537
EDMA_TCC(EDMA_CHAN_SLOT(prtd->asp_channel));
538
prtd->asp_params.link_bcntrld = EDMA_CHAN_SLOT(prtd->asp_link[0]) << 5;
539
edma_write_slot(prtd->asp_link[0], &prtd->asp_params);
542
edma_free_channel(prtd->asp_channel);
543
prtd->asp_channel = -1;
548
static int davinci_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
550
struct davinci_runtime_data *prtd = substream->runtime->private_data;
553
spin_lock(&prtd->lock);
556
case SNDRV_PCM_TRIGGER_START:
557
edma_start(prtd->asp_channel);
558
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
559
prtd->ram_channel >= 0) {
560
/* copy 1st iram buffer */
561
edma_start(prtd->ram_channel);
564
case SNDRV_PCM_TRIGGER_RESUME:
565
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
566
edma_resume(prtd->asp_channel);
568
case SNDRV_PCM_TRIGGER_STOP:
569
case SNDRV_PCM_TRIGGER_SUSPEND:
570
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
571
edma_pause(prtd->asp_channel);
578
spin_unlock(&prtd->lock);
583
static int davinci_pcm_prepare(struct snd_pcm_substream *substream)
585
struct davinci_runtime_data *prtd = substream->runtime->private_data;
587
davinci_pcm_period_reset(substream);
588
if (prtd->ram_channel >= 0) {
589
int ret = ping_pong_dma_setup(substream);
593
edma_write_slot(prtd->ram_channel, &prtd->ram_params);
594
edma_write_slot(prtd->asp_channel, &prtd->asp_params);
596
print_buf_info(prtd->ram_channel, "ram_channel");
597
print_buf_info(prtd->ram_link, "ram_link");
598
print_buf_info(prtd->ram_link2, "ram_link2");
599
print_buf_info(prtd->asp_channel, "asp_channel");
600
print_buf_info(prtd->asp_link[0], "asp_link[0]");
601
print_buf_info(prtd->asp_link[1], "asp_link[1]");
604
* There is a phase offset of 2 periods between the position
605
* used by dma setup and the position reported in the pointer
608
* The phase offset, when not using ping-pong buffers, is due to
609
* the two consecutive calls to davinci_pcm_enqueue_dma() below.
611
* Whereas here, with ping-pong buffers, the phase is due to
612
* there being an entire buffer transfer complete before the
613
* first dma completion event triggers davinci_pcm_dma_irq().
615
davinci_pcm_period_elapsed(substream);
616
davinci_pcm_period_elapsed(substream);
620
davinci_pcm_enqueue_dma(substream);
621
davinci_pcm_period_elapsed(substream);
623
/* Copy self-linked parameter RAM entry into master channel */
624
edma_read_slot(prtd->asp_link[0], &prtd->asp_params);
625
edma_write_slot(prtd->asp_channel, &prtd->asp_params);
626
davinci_pcm_enqueue_dma(substream);
627
davinci_pcm_period_elapsed(substream);
632
static snd_pcm_uframes_t
633
davinci_pcm_pointer(struct snd_pcm_substream *substream)
635
struct snd_pcm_runtime *runtime = substream->runtime;
636
struct davinci_runtime_data *prtd = runtime->private_data;
639
unsigned int period_size = snd_pcm_lib_period_bytes(substream);
642
* There is a phase offset of 2 periods between the position used by dma
643
* setup and the position reported in the pointer function. Either +2 in
644
* the dma setup or -2 here in the pointer function (with wrapping,
645
* both) accounts for this offset -- choose the latter since it makes
646
* the first-time setup clearer.
648
spin_lock(&prtd->lock);
649
asp_count = prtd->period - 2;
650
spin_unlock(&prtd->lock);
653
asp_count += runtime->periods;
654
asp_count *= period_size;
656
offset = bytes_to_frames(runtime, asp_count);
657
if (offset >= runtime->buffer_size)
663
static int davinci_pcm_open(struct snd_pcm_substream *substream)
665
struct snd_pcm_runtime *runtime = substream->runtime;
666
struct davinci_runtime_data *prtd;
667
struct snd_pcm_hardware *ppcm;
669
struct snd_soc_pcm_runtime *rtd = substream->private_data;
670
struct davinci_pcm_dma_params *pa;
671
struct davinci_pcm_dma_params *params;
673
pa = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
676
params = &pa[substream->stream];
678
ppcm = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
679
&pcm_hardware_playback : &pcm_hardware_capture;
680
allocate_sram(substream, params->sram_size, ppcm);
681
snd_soc_set_runtime_hwparams(substream, ppcm);
682
/* ensure that buffer size is a multiple of period size */
683
ret = snd_pcm_hw_constraint_integer(runtime,
684
SNDRV_PCM_HW_PARAM_PERIODS);
688
prtd = kzalloc(sizeof(struct davinci_runtime_data), GFP_KERNEL);
692
spin_lock_init(&prtd->lock);
693
prtd->params = params;
694
prtd->asp_channel = -1;
695
prtd->asp_link[0] = prtd->asp_link[1] = -1;
696
prtd->ram_channel = -1;
698
prtd->ram_link2 = -1;
700
runtime->private_data = prtd;
702
ret = davinci_pcm_dma_request(substream);
704
printk(KERN_ERR "davinci_pcm: Failed to get dma channels\n");
711
static int davinci_pcm_close(struct snd_pcm_substream *substream)
713
struct snd_pcm_runtime *runtime = substream->runtime;
714
struct davinci_runtime_data *prtd = runtime->private_data;
716
if (prtd->ram_channel >= 0)
717
edma_stop(prtd->ram_channel);
718
if (prtd->asp_channel >= 0)
719
edma_stop(prtd->asp_channel);
720
if (prtd->asp_link[0] >= 0)
721
edma_unlink(prtd->asp_link[0]);
722
if (prtd->asp_link[1] >= 0)
723
edma_unlink(prtd->asp_link[1]);
724
if (prtd->ram_link >= 0)
725
edma_unlink(prtd->ram_link);
727
if (prtd->asp_link[0] >= 0)
728
edma_free_slot(prtd->asp_link[0]);
729
if (prtd->asp_link[1] >= 0)
730
edma_free_slot(prtd->asp_link[1]);
731
if (prtd->asp_channel >= 0)
732
edma_free_channel(prtd->asp_channel);
733
if (prtd->ram_link >= 0)
734
edma_free_slot(prtd->ram_link);
735
if (prtd->ram_link2 >= 0)
736
edma_free_slot(prtd->ram_link2);
737
if (prtd->ram_channel >= 0)
738
edma_free_channel(prtd->ram_channel);
745
static int davinci_pcm_hw_params(struct snd_pcm_substream *substream,
746
struct snd_pcm_hw_params *hw_params)
748
return snd_pcm_lib_malloc_pages(substream,
749
params_buffer_bytes(hw_params));
752
static int davinci_pcm_hw_free(struct snd_pcm_substream *substream)
754
return snd_pcm_lib_free_pages(substream);
757
static int davinci_pcm_mmap(struct snd_pcm_substream *substream,
758
struct vm_area_struct *vma)
760
struct snd_pcm_runtime *runtime = substream->runtime;
762
return dma_mmap_writecombine(substream->pcm->card->dev, vma,
768
static struct snd_pcm_ops davinci_pcm_ops = {
769
.open = davinci_pcm_open,
770
.close = davinci_pcm_close,
771
.ioctl = snd_pcm_lib_ioctl,
772
.hw_params = davinci_pcm_hw_params,
773
.hw_free = davinci_pcm_hw_free,
774
.prepare = davinci_pcm_prepare,
775
.trigger = davinci_pcm_trigger,
776
.pointer = davinci_pcm_pointer,
777
.mmap = davinci_pcm_mmap,
780
static int davinci_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream,
783
struct snd_pcm_substream *substream = pcm->streams[stream].substream;
784
struct snd_dma_buffer *buf = &substream->dma_buffer;
786
buf->dev.type = SNDRV_DMA_TYPE_DEV;
787
buf->dev.dev = pcm->card->dev;
788
buf->private_data = NULL;
789
buf->area = dma_alloc_writecombine(pcm->card->dev, size,
790
&buf->addr, GFP_KERNEL);
792
pr_debug("davinci_pcm: preallocate_dma_buffer: area=%p, addr=%p, "
793
"size=%d\n", (void *) buf->area, (void *) buf->addr, size);
802
static void davinci_pcm_free(struct snd_pcm *pcm)
804
struct snd_pcm_substream *substream;
805
struct snd_dma_buffer *buf;
808
for (stream = 0; stream < 2; stream++) {
809
struct snd_dma_buffer *iram_dma;
810
substream = pcm->streams[stream].substream;
814
buf = &substream->dma_buffer;
818
dma_free_writecombine(pcm->card->dev, buf->bytes,
819
buf->area, buf->addr);
821
iram_dma = buf->private_data;
823
sram_free(iram_dma->area, iram_dma->bytes);
829
static u64 davinci_pcm_dmamask = 0xffffffff;
831
static int davinci_pcm_new(struct snd_soc_pcm_runtime *rtd)
833
struct snd_card *card = rtd->card->snd_card;
834
struct snd_soc_dai *dai = rtd->cpu_dai;
835
struct snd_pcm *pcm = rtd->pcm;
838
if (!card->dev->dma_mask)
839
card->dev->dma_mask = &davinci_pcm_dmamask;
840
if (!card->dev->coherent_dma_mask)
841
card->dev->coherent_dma_mask = 0xffffffff;
843
if (dai->driver->playback.channels_min) {
844
ret = davinci_pcm_preallocate_dma_buffer(pcm,
845
SNDRV_PCM_STREAM_PLAYBACK,
846
pcm_hardware_playback.buffer_bytes_max);
851
if (dai->driver->capture.channels_min) {
852
ret = davinci_pcm_preallocate_dma_buffer(pcm,
853
SNDRV_PCM_STREAM_CAPTURE,
854
pcm_hardware_capture.buffer_bytes_max);
862
static struct snd_soc_platform_driver davinci_soc_platform = {
863
.ops = &davinci_pcm_ops,
864
.pcm_new = davinci_pcm_new,
865
.pcm_free = davinci_pcm_free,
868
static int __devinit davinci_soc_platform_probe(struct platform_device *pdev)
870
return snd_soc_register_platform(&pdev->dev, &davinci_soc_platform);
873
static int __devexit davinci_soc_platform_remove(struct platform_device *pdev)
875
snd_soc_unregister_platform(&pdev->dev);
879
static struct platform_driver davinci_pcm_driver = {
881
.name = "davinci-pcm-audio",
882
.owner = THIS_MODULE,
885
.probe = davinci_soc_platform_probe,
886
.remove = __devexit_p(davinci_soc_platform_remove),
889
static int __init snd_davinci_pcm_init(void)
891
return platform_driver_register(&davinci_pcm_driver);
893
module_init(snd_davinci_pcm_init);
895
static void __exit snd_davinci_pcm_exit(void)
897
platform_driver_unregister(&davinci_pcm_driver);
899
module_exit(snd_davinci_pcm_exit);
901
MODULE_AUTHOR("Vladimir Barinov");
902
MODULE_DESCRIPTION("TI DAVINCI PCM DMA module");
903
MODULE_LICENSE("GPL");