/*
* linux/sound/mpc5200-ac97.c -- AC97 support for the Freescale MPC52xx chip.
*
* Copyright (C) 2009 Jon Smirl, Digispeaker
* Author: Jon Smirl <jonsmirl@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/of_platform.h>
#include <linux/delay.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <asm/time.h>
#include <asm/delay.h>
#include <asm/mpc52xx.h>
#include <asm/mpc52xx_psc.h>
#include "mpc5200_dma.h"
#include "mpc5200_psc_ac97.h"
#define DRV_NAME "mpc5200-psc-ac97"
/* ALSA only supports a single AC97 device so static is recommend here */
static struct psc_dma *psc_dma;
static unsigned short psc_ac97_read(struct snd_ac97 *ac97, unsigned short reg)
{
int status;
unsigned int val;
mutex_lock(&psc_dma->mutex);
/* Wait for command send status zero = ready */
status = spin_event_timeout(!(in_be16(&psc_dma->psc_regs->sr_csr.status) &
MPC52xx_PSC_SR_CMDSEND), 100, 0);
if (status == 0) {
pr_err("timeout on ac97 bus (rdy)\n");
mutex_unlock(&psc_dma->mutex);
return -ENODEV;
}
/* Force clear the data valid bit */
in_be32(&psc_dma->psc_regs->ac97_data);
/* Send the read */
out_be32(&psc_dma->psc_regs->ac97_cmd, (1<<31) | ((reg & 0x7f) << 24));
/* Wait for the answer */
status = spin_event_timeout((in_be16(&psc_dma->psc_regs->sr_csr.status) &
MPC52xx_PSC_SR_DATA_VAL), 100, 0);
if (status == 0) {
pr_err("timeout on ac97 read (val) %x\n",
in_be16(&psc_dma->psc_regs->sr_csr.status));
mutex_unlock(&psc_dma->mutex);
return -ENODEV;
}
/* Get the data */
val = in_be32(&psc_dma->psc_regs->ac97_data);
if (((val >> 24) & 0x7f) != reg) {
pr_err("reg echo error on ac97 read\n");
mutex_unlock(&psc_dma->mutex);
return -ENODEV;
}
val = (val >> 8) & 0xffff;
mutex_unlock(&psc_dma->mutex);
return (unsigned short) val;
}
static void psc_ac97_write(struct snd_ac97 *ac97,
unsigned short reg, unsigned short val)
{
int status;
mutex_lock(&psc_dma->mutex);
/* Wait for command status zero = ready */
status = spin_event_timeout(!(in_be16(&psc_dma->psc_regs->sr_csr.status) &
MPC52xx_PSC_SR_CMDSEND), 100, 0);
if (status == 0) {
pr_err("timeout on ac97 bus (write)\n");
goto out;
}
/* Write data */
out_be32(&psc_dma->psc_regs->ac97_cmd,
((reg & 0x7f) << 24) | (val << 8));
out:
mutex_unlock(&psc_dma->mutex);
}
static void psc_ac97_warm_reset(struct snd_ac97 *ac97)
{
struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
mutex_lock(&psc_dma->mutex);
out_be32(®s->sicr, psc_dma->sicr | MPC52xx_PSC_SICR_AWR);
udelay(3);
out_be32(®s->sicr, psc_dma->sicr);
mutex_unlock(&psc_dma->mutex);
}
static void psc_ac97_cold_reset(struct snd_ac97 *ac97)
{
struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
mutex_lock(&psc_dma->mutex);
dev_dbg(psc_dma->dev, "cold reset\n");
mpc5200_psc_ac97_gpio_reset(psc_dma->id);
/* Notify the PSC that a reset has occurred */
out_be32(®s->sicr, psc_dma->sicr | MPC52xx_PSC_SICR_ACRB);
/* Re-enable RX and TX */
out_8(®s->command, MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE);
mutex_unlock(&psc_dma->mutex);
msleep(1);
psc_ac97_warm_reset(ac97);
}
struct snd_ac97_bus_ops soc_ac97_ops = {
.read = psc_ac97_read,
.write = psc_ac97_write,
.reset = psc_ac97_cold_reset,
.warm_reset = psc_ac97_warm_reset,
};
EXPORT_SYMBOL_GPL(soc_ac97_ops);
static int psc_ac97_hw_analog_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *cpu_dai)
{
struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai);
struct psc_dma_stream *s = to_psc_dma_stream(substream, psc_dma);
dev_dbg(psc_dma->dev, "%s(substream=%p) p_size=%i p_bytes=%i"
" periods=%i buffer_size=%i buffer_bytes=%i channels=%i"
" rate=%i format=%i\n",
__func__, substream, params_period_size(params),
params_period_bytes(params), params_periods(params),
params_buffer_size(params), params_buffer_bytes(params),
params_channels(params), params_rate(params),
params_format(params));
/* Determine the set of enable bits to turn on */
s->ac97_slot_bits = (params_channels(params) == 1) ? 0x100 : 0x300;
if (substream->pstr->stream != SNDRV_PCM_STREAM_CAPTURE)
s->ac97_slot_bits <<= 16;
return 0;
}
static int psc_ac97_hw_digital_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *cpu_dai)
{
struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai);
dev_dbg(psc_dma->dev, "%s(substream=%p)\n", __func__, substream);
if (params_channels(params) == 1)
out_be32(&psc_dma->psc_regs->ac97_slots, 0x01000000);
else
out_be32(&psc_dma->psc_regs->ac97_slots, 0x03000000);
return 0;
}
static int psc_ac97_trigger(struct snd_pcm_substream *substream, int cmd,
struct snd_soc_dai *dai)
{
struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(dai);
struct psc_dma_stream *s = to_psc_dma_stream(substream, psc_dma);
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
dev_dbg(psc_dma->dev, "AC97 START: stream=%i\n",
substream->pstr->stream);
/* Set the slot enable bits */
psc_dma->slots |= s->ac97_slot_bits;
out_be32(&psc_dma->psc_regs->ac97_slots, psc_dma->slots);
break;
case SNDRV_PCM_TRIGGER_STOP:
dev_dbg(psc_dma->dev, "AC97 STOP: stream=%i\n",
substream->pstr->stream);
/* Clear the slot enable bits */
psc_dma->slots &= ~(s->ac97_slot_bits);
out_be32(&psc_dma->psc_regs->ac97_slots, psc_dma->slots);
break;
}
return 0;
}
static int psc_ac97_probe(struct snd_soc_dai *cpu_dai)
{
struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai);
struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
/* Go */
out_8(®s->command, MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE);
return 0;
}
/* ---------------------------------------------------------------------
* ALSA SoC Bindings
*
* - Digital Audio Interface (DAI) template
* - create/destroy dai hooks
*/
/**
* psc_ac97_dai_template: template CPU Digital Audio Interface
*/
static struct snd_soc_dai_ops psc_ac97_analog_ops = {
.hw_params = psc_ac97_hw_analog_params,
.trigger = psc_ac97_trigger,
};
static struct snd_soc_dai_ops psc_ac97_digital_ops = {
.hw_params = psc_ac97_hw_digital_params,
};
static struct snd_soc_dai_driver psc_ac97_dai[] = {
{
.ac97_control = 1,
.probe = psc_ac97_probe,
.playback = {
.channels_min = 1,
.channels_max = 6,
.rates = SNDRV_PCM_RATE_8000_48000,
.formats = SNDRV_PCM_FMTBIT_S32_BE,
},
.capture = {
.channels_min = 1,
.channels_max = 2,
.rates = SNDRV_PCM_RATE_8000_48000,
.formats = SNDRV_PCM_FMTBIT_S32_BE,
},
.ops = &psc_ac97_analog_ops,
},
{
.ac97_control = 1,
.playback = {
.channels_min = 1,
.channels_max = 2,
.rates = SNDRV_PCM_RATE_32000 | \
SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000,
.formats = SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE,
},
.ops = &psc_ac97_digital_ops,
} };
/* ---------------------------------------------------------------------
* OF platform bus binding code:
* - Probe/remove operations
* - OF device match table
*/
static int __devinit psc_ac97_of_probe(struct platform_device *op)
{
int rc;
struct snd_ac97 ac97;
struct mpc52xx_psc __iomem *regs;
rc = snd_soc_register_dais(&op->dev, psc_ac97_dai, ARRAY_SIZE(psc_ac97_dai));
if (rc != 0) {
dev_err(&op->dev, "Failed to register DAI\n");
return rc;
}
psc_dma = dev_get_drvdata(&op->dev);
regs = psc_dma->psc_regs;
ac97.private_data = psc_dma;
psc_dma->imr = 0;
out_be16(&psc_dma->psc_regs->isr_imr.imr, psc_dma->imr);
/* Configure the serial interface mode to AC97 */
psc_dma->sicr = MPC52xx_PSC_SICR_SIM_AC97 | MPC52xx_PSC_SICR_ENAC97;
out_be32(®s->sicr, psc_dma->sicr);
/* No slots active */
out_be32(®s->ac97_slots, 0x00000000);
return 0;
}
static int __devexit psc_ac97_of_remove(struct platform_device *op)
{
snd_soc_unregister_dais(&op->dev, ARRAY_SIZE(psc_ac97_dai));
return 0;
}
/* Match table for of_platform binding */
static struct of_device_id psc_ac97_match[] __devinitdata = {
{ .compatible = "fsl,mpc5200-psc-ac97", },
{ .compatible = "fsl,mpc5200b-psc-ac97", },
{}
};
MODULE_DEVICE_TABLE(of, psc_ac97_match);
static struct platform_driver psc_ac97_driver = {
.probe = psc_ac97_of_probe,
.remove = __devexit_p(psc_ac97_of_remove),
.driver = {
.name = "mpc5200-psc-ac97",
.owner = THIS_MODULE,
.of_match_table = psc_ac97_match,
},
};
/* ---------------------------------------------------------------------
* Module setup and teardown; simply register the of_platform driver
* for the PSC in AC97 mode.
*/
static int __init psc_ac97_init(void)
{
return platform_driver_register(&psc_ac97_driver);
}
module_init(psc_ac97_init);
static void __exit psc_ac97_exit(void)
{
platform_driver_unregister(&psc_ac97_driver);
}
module_exit(psc_ac97_exit);
MODULE_AUTHOR("Jon Smirl <jonsmirl@gmail.com>");
MODULE_DESCRIPTION("mpc5200 AC97 module");
MODULE_LICENSE("GPL");