244 lines
6.6 KiB
C
244 lines
6.6 KiB
C
/*
|
|
* Freescale MPC5200 PSC in I2S mode
|
|
* ALSA SoC Digital Audio Interface (DAI) driver
|
|
*
|
|
* Copyright (C) 2008 Secret Lab Technologies Ltd.
|
|
* Copyright (C) 2009 Jon Smirl, Digispeaker
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/of_device.h>
|
|
#include <linux/of_platform.h>
|
|
|
|
#include <sound/pcm.h>
|
|
#include <sound/pcm_params.h>
|
|
#include <sound/soc.h>
|
|
|
|
#include <asm/mpc52xx_psc.h>
|
|
|
|
#include "mpc5200_dma.h"
|
|
|
|
/**
|
|
* PSC_I2S_RATES: sample rates supported by the I2S
|
|
*
|
|
* This driver currently only supports the PSC running in I2S slave mode,
|
|
* which means the codec determines the sample rate. Therefore, we tell
|
|
* ALSA that we support all rates and let the codec driver decide what rates
|
|
* are really supported.
|
|
*/
|
|
#define PSC_I2S_RATES (SNDRV_PCM_RATE_5512 | SNDRV_PCM_RATE_8000_192000 | \
|
|
SNDRV_PCM_RATE_CONTINUOUS)
|
|
|
|
/**
|
|
* PSC_I2S_FORMATS: audio formats supported by the PSC I2S mode
|
|
*/
|
|
#define PSC_I2S_FORMATS (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_BE | \
|
|
SNDRV_PCM_FMTBIT_S24_BE | SNDRV_PCM_FMTBIT_S32_BE)
|
|
|
|
static int psc_i2s_hw_params(struct snd_pcm_substream *substream,
|
|
struct snd_pcm_hw_params *params,
|
|
struct snd_soc_dai *dai)
|
|
{
|
|
struct snd_soc_pcm_runtime *rtd = substream->private_data;
|
|
struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(rtd->cpu_dai);
|
|
u32 mode;
|
|
|
|
dev_dbg(psc_dma->dev, "%s(substream=%p) p_size=%i p_bytes=%i"
|
|
" periods=%i buffer_size=%i buffer_bytes=%i\n",
|
|
__func__, substream, params_period_size(params),
|
|
params_period_bytes(params), params_periods(params),
|
|
params_buffer_size(params), params_buffer_bytes(params));
|
|
|
|
switch (params_format(params)) {
|
|
case SNDRV_PCM_FORMAT_S8:
|
|
mode = MPC52xx_PSC_SICR_SIM_CODEC_8;
|
|
break;
|
|
case SNDRV_PCM_FORMAT_S16_BE:
|
|
mode = MPC52xx_PSC_SICR_SIM_CODEC_16;
|
|
break;
|
|
case SNDRV_PCM_FORMAT_S24_BE:
|
|
mode = MPC52xx_PSC_SICR_SIM_CODEC_24;
|
|
break;
|
|
case SNDRV_PCM_FORMAT_S32_BE:
|
|
mode = MPC52xx_PSC_SICR_SIM_CODEC_32;
|
|
break;
|
|
default:
|
|
dev_dbg(psc_dma->dev, "invalid format\n");
|
|
return -EINVAL;
|
|
}
|
|
out_be32(&psc_dma->psc_regs->sicr, psc_dma->sicr | mode);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* psc_i2s_set_sysclk: set the clock frequency and direction
|
|
*
|
|
* This function is called by the machine driver to tell us what the clock
|
|
* frequency and direction are.
|
|
*
|
|
* Currently, we only support operating as a clock slave (SND_SOC_CLOCK_IN),
|
|
* and we don't care about the frequency. Return an error if the direction
|
|
* is not SND_SOC_CLOCK_IN.
|
|
*
|
|
* @clk_id: reserved, should be zero
|
|
* @freq: the frequency of the given clock ID, currently ignored
|
|
* @dir: SND_SOC_CLOCK_IN (clock slave) or SND_SOC_CLOCK_OUT (clock master)
|
|
*/
|
|
static int psc_i2s_set_sysclk(struct snd_soc_dai *cpu_dai,
|
|
int clk_id, unsigned int freq, int dir)
|
|
{
|
|
struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai);
|
|
dev_dbg(psc_dma->dev, "psc_i2s_set_sysclk(cpu_dai=%p, dir=%i)\n",
|
|
cpu_dai, dir);
|
|
return (dir == SND_SOC_CLOCK_IN) ? 0 : -EINVAL;
|
|
}
|
|
|
|
/**
|
|
* psc_i2s_set_fmt: set the serial format.
|
|
*
|
|
* This function is called by the machine driver to tell us what serial
|
|
* format to use.
|
|
*
|
|
* This driver only supports I2S mode. Return an error if the format is
|
|
* not SND_SOC_DAIFMT_I2S.
|
|
*
|
|
* @format: one of SND_SOC_DAIFMT_xxx
|
|
*/
|
|
static int psc_i2s_set_fmt(struct snd_soc_dai *cpu_dai, unsigned int format)
|
|
{
|
|
struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai);
|
|
dev_dbg(psc_dma->dev, "psc_i2s_set_fmt(cpu_dai=%p, format=%i)\n",
|
|
cpu_dai, format);
|
|
return (format == SND_SOC_DAIFMT_I2S) ? 0 : -EINVAL;
|
|
}
|
|
|
|
/* ---------------------------------------------------------------------
|
|
* ALSA SoC Bindings
|
|
*
|
|
* - Digital Audio Interface (DAI) template
|
|
* - create/destroy dai hooks
|
|
*/
|
|
|
|
/**
|
|
* psc_i2s_dai_template: template CPU Digital Audio Interface
|
|
*/
|
|
static const struct snd_soc_dai_ops psc_i2s_dai_ops = {
|
|
.hw_params = psc_i2s_hw_params,
|
|
.set_sysclk = psc_i2s_set_sysclk,
|
|
.set_fmt = psc_i2s_set_fmt,
|
|
};
|
|
|
|
static struct snd_soc_dai_driver psc_i2s_dai[] = {{
|
|
.name = "mpc5200-psc-i2s.0",
|
|
.playback = {
|
|
.stream_name = "I2S Playback",
|
|
.channels_min = 2,
|
|
.channels_max = 2,
|
|
.rates = PSC_I2S_RATES,
|
|
.formats = PSC_I2S_FORMATS,
|
|
},
|
|
.capture = {
|
|
.stream_name = "I2S Capture",
|
|
.channels_min = 2,
|
|
.channels_max = 2,
|
|
.rates = PSC_I2S_RATES,
|
|
.formats = PSC_I2S_FORMATS,
|
|
},
|
|
.ops = &psc_i2s_dai_ops,
|
|
} };
|
|
|
|
static const struct snd_soc_component_driver psc_i2s_component = {
|
|
.name = "mpc5200-i2s",
|
|
};
|
|
|
|
/* ---------------------------------------------------------------------
|
|
* OF platform bus binding code:
|
|
* - Probe/remove operations
|
|
* - OF device match table
|
|
*/
|
|
static int psc_i2s_of_probe(struct platform_device *op)
|
|
{
|
|
int rc;
|
|
struct psc_dma *psc_dma;
|
|
struct mpc52xx_psc __iomem *regs;
|
|
|
|
rc = mpc5200_audio_dma_create(op);
|
|
if (rc != 0)
|
|
return rc;
|
|
|
|
rc = snd_soc_register_component(&op->dev, &psc_i2s_component,
|
|
psc_i2s_dai, ARRAY_SIZE(psc_i2s_dai));
|
|
if (rc != 0) {
|
|
pr_err("Failed to register DAI\n");
|
|
return rc;
|
|
}
|
|
|
|
psc_dma = dev_get_drvdata(&op->dev);
|
|
regs = psc_dma->psc_regs;
|
|
|
|
/* Configure the serial interface mode; defaulting to CODEC8 mode */
|
|
psc_dma->sicr = MPC52xx_PSC_SICR_DTS1 | MPC52xx_PSC_SICR_I2S |
|
|
MPC52xx_PSC_SICR_CLKPOL;
|
|
out_be32(&psc_dma->psc_regs->sicr,
|
|
psc_dma->sicr | MPC52xx_PSC_SICR_SIM_CODEC_8);
|
|
|
|
/* Check for the codec handle. If it is not present then we
|
|
* are done */
|
|
if (!of_get_property(op->dev.of_node, "codec-handle", NULL))
|
|
return 0;
|
|
|
|
/* Due to errata in the dma mode; need to line up enabling
|
|
* the transmitter with a transition on the frame sync
|
|
* line */
|
|
|
|
/* first make sure it is low */
|
|
while ((in_8(®s->ipcr_acr.ipcr) & 0x80) != 0)
|
|
;
|
|
/* then wait for the transition to high */
|
|
while ((in_8(®s->ipcr_acr.ipcr) & 0x80) == 0)
|
|
;
|
|
/* Finally, enable the PSC.
|
|
* Receiver must always be enabled; even when we only want
|
|
* transmit. (see 15.3.2.3 of MPC5200B User's Guide) */
|
|
|
|
/* Go */
|
|
out_8(&psc_dma->psc_regs->command,
|
|
MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
static int psc_i2s_of_remove(struct platform_device *op)
|
|
{
|
|
mpc5200_audio_dma_destroy(op);
|
|
snd_soc_unregister_component(&op->dev);
|
|
return 0;
|
|
}
|
|
|
|
/* Match table for of_platform binding */
|
|
static struct of_device_id psc_i2s_match[] = {
|
|
{ .compatible = "fsl,mpc5200-psc-i2s", },
|
|
{ .compatible = "fsl,mpc5200b-psc-i2s", },
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(of, psc_i2s_match);
|
|
|
|
static struct platform_driver psc_i2s_driver = {
|
|
.probe = psc_i2s_of_probe,
|
|
.remove = psc_i2s_of_remove,
|
|
.driver = {
|
|
.name = "mpc5200-psc-i2s",
|
|
.owner = THIS_MODULE,
|
|
.of_match_table = psc_i2s_match,
|
|
},
|
|
};
|
|
|
|
module_platform_driver(psc_i2s_driver);
|
|
|
|
MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
|
|
MODULE_DESCRIPTION("Freescale MPC5200 PSC in I2S mode ASoC Driver");
|
|
MODULE_LICENSE("GPL");
|
|
|