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kernel-ark/sound/soc/at32/at32-ssc.c
Liam Girdwood 453ba20b28 ALSA: asoc: at32 - merge structs snd_soc_codec_dai and snd_soc_cpu_dai. 
This patch series merges struct snd_soc_codec_dai and struct
snd_soc_cpu_dai into struct snd_soc_dai for AT32 platform.

Signed-off-by: Liam Girdwood <lg@opensource.wolfsonmicro.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
2008-07-10 09:32:34 +02:00

850 lines
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Raw Blame History

/* sound/soc/at32/at32-ssc.c
* ASoC platform driver for AT32 using SSC as DAI
*
* Copyright (C) 2008 Long Range Systems
* Geoffrey Wossum <gwossum@acm.org>
*
* 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.
*
* Note that this is basically a port of the sound/soc/at91-ssc.c to
* the AVR32 kernel. Thanks to Frank Mandarino for that code.
*/
/* #define DEBUG */
#include <linux/init.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/device.h>
#include <linux/delay.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/atmel_pdc.h>
#include <linux/atmel-ssc.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/initval.h>
#include <sound/soc.h>
#include "at32-pcm.h"
#include "at32-ssc.h"
/*-------------------------------------------------------------------------*\
* Constants
\*-------------------------------------------------------------------------*/
#define NUM_SSC_DEVICES 3
/*
* SSC direction masks
*/
#define SSC_DIR_MASK_UNUSED 0
#define SSC_DIR_MASK_PLAYBACK 1
#define SSC_DIR_MASK_CAPTURE 2
/*
* SSC register values that Atmel left out of <linux/atmel-ssc.h>. These
* are expected to be used with SSC_BF
*/
/* START bit field values */
#define SSC_START_CONTINUOUS 0
#define SSC_START_TX_RX 1
#define SSC_START_LOW_RF 2
#define SSC_START_HIGH_RF 3
#define SSC_START_FALLING_RF 4
#define SSC_START_RISING_RF 5
#define SSC_START_LEVEL_RF 6
#define SSC_START_EDGE_RF 7
#define SSS_START_COMPARE_0 8
/* CKI bit field values */
#define SSC_CKI_FALLING 0
#define SSC_CKI_RISING 1
/* CKO bit field values */
#define SSC_CKO_NONE 0
#define SSC_CKO_CONTINUOUS 1
#define SSC_CKO_TRANSFER 2
/* CKS bit field values */
#define SSC_CKS_DIV 0
#define SSC_CKS_CLOCK 1
#define SSC_CKS_PIN 2
/* FSEDGE bit field values */
#define SSC_FSEDGE_POSITIVE 0
#define SSC_FSEDGE_NEGATIVE 1
/* FSOS bit field values */
#define SSC_FSOS_NONE 0
#define SSC_FSOS_NEGATIVE 1
#define SSC_FSOS_POSITIVE 2
#define SSC_FSOS_LOW 3
#define SSC_FSOS_HIGH 4
#define SSC_FSOS_TOGGLE 5
#define START_DELAY 1
/*-------------------------------------------------------------------------*\
* Module data
\*-------------------------------------------------------------------------*/
/*
* SSC PDC registered required by the PCM DMA engine
*/
static struct at32_pdc_regs pdc_tx_reg = {
.xpr = SSC_PDC_TPR,
.xcr = SSC_PDC_TCR,
.xnpr = SSC_PDC_TNPR,
.xncr = SSC_PDC_TNCR,
};
static struct at32_pdc_regs pdc_rx_reg = {
.xpr = SSC_PDC_RPR,
.xcr = SSC_PDC_RCR,
.xnpr = SSC_PDC_RNPR,
.xncr = SSC_PDC_RNCR,
};
/*
* SSC and PDC status bits for transmit and receive
*/
static struct at32_ssc_mask ssc_tx_mask = {
.ssc_enable = SSC_BIT(CR_TXEN),
.ssc_disable = SSC_BIT(CR_TXDIS),
.ssc_endx = SSC_BIT(SR_ENDTX),
.ssc_endbuf = SSC_BIT(SR_TXBUFE),
.pdc_enable = SSC_BIT(PDC_PTCR_TXTEN),
.pdc_disable = SSC_BIT(PDC_PTCR_TXTDIS),
};
static struct at32_ssc_mask ssc_rx_mask = {
.ssc_enable = SSC_BIT(CR_RXEN),
.ssc_disable = SSC_BIT(CR_RXDIS),
.ssc_endx = SSC_BIT(SR_ENDRX),
.ssc_endbuf = SSC_BIT(SR_RXBUFF),
.pdc_enable = SSC_BIT(PDC_PTCR_RXTEN),
.pdc_disable = SSC_BIT(PDC_PTCR_RXTDIS),
};
/*
* DMA parameters for each SSC
*/
static struct at32_pcm_dma_params ssc_dma_params[NUM_SSC_DEVICES][2] = {
{
{
.name = "SSC0 PCM out",
.pdc = &pdc_tx_reg,
.mask = &ssc_tx_mask,
},
{
.name = "SSC0 PCM in",
.pdc = &pdc_rx_reg,
.mask = &ssc_rx_mask,
},
},
{
{
.name = "SSC1 PCM out",
.pdc = &pdc_tx_reg,
.mask = &ssc_tx_mask,
},
{
.name = "SSC1 PCM in",
.pdc = &pdc_rx_reg,
.mask = &ssc_rx_mask,
},
},
{
{
.name = "SSC2 PCM out",
.pdc = &pdc_tx_reg,
.mask = &ssc_tx_mask,
},
{
.name = "SSC2 PCM in",
.pdc = &pdc_rx_reg,
.mask = &ssc_rx_mask,
},
},
};
static struct at32_ssc_info ssc_info[NUM_SSC_DEVICES] = {
{
.name = "ssc0",
.lock = __SPIN_LOCK_UNLOCKED(ssc_info[0].lock),
.dir_mask = SSC_DIR_MASK_UNUSED,
.initialized = 0,
},
{
.name = "ssc1",
.lock = __SPIN_LOCK_UNLOCKED(ssc_info[1].lock),
.dir_mask = SSC_DIR_MASK_UNUSED,
.initialized = 0,
},
{
.name = "ssc2",
.lock = __SPIN_LOCK_UNLOCKED(ssc_info[2].lock),
.dir_mask = SSC_DIR_MASK_UNUSED,
.initialized = 0,
},
};
/*-------------------------------------------------------------------------*\
* ISR
\*-------------------------------------------------------------------------*/
/*
* SSC interrupt handler. Passes PDC interrupts to the DMA interrupt
* handler in the PCM driver.
*/
static irqreturn_t at32_ssc_interrupt(int irq, void *dev_id)
{
struct at32_ssc_info *ssc_p = dev_id;
struct at32_pcm_dma_params *dma_params;
u32 ssc_sr;
u32 ssc_substream_mask;
int i;
ssc_sr = (ssc_readl(ssc_p->ssc->regs, SR) &
ssc_readl(ssc_p->ssc->regs, IMR));
/*
* Loop through substreams attached to this SSC. If a DMA-related
* interrupt occured on that substream, call the DMA interrupt
* handler function, if one has been registered in the dma_param
* structure by the PCM driver.
*/
for (i = 0; i < ARRAY_SIZE(ssc_p->dma_params); i++) {
dma_params = ssc_p->dma_params[i];
if ((dma_params != NULL) &&
(dma_params->dma_intr_handler != NULL)) {
ssc_substream_mask = (dma_params->mask->ssc_endx |
dma_params->mask->ssc_endbuf);
if (ssc_sr & ssc_substream_mask) {
dma_params->dma_intr_handler(ssc_sr,
dma_params->
substream);
}
}
}
return IRQ_HANDLED;
}
/*-------------------------------------------------------------------------*\
* DAI functions
\*-------------------------------------------------------------------------*/
/*
* Startup. Only that one substream allowed in each direction.
*/
static int at32_ssc_startup(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct at32_ssc_info *ssc_p = &ssc_info[rtd->dai->cpu_dai->id];
int dir_mask;
dir_mask = ((substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
SSC_DIR_MASK_PLAYBACK : SSC_DIR_MASK_CAPTURE);
spin_lock_irq(&ssc_p->lock);
if (ssc_p->dir_mask & dir_mask) {
spin_unlock_irq(&ssc_p->lock);
return -EBUSY;
}
ssc_p->dir_mask |= dir_mask;
spin_unlock_irq(&ssc_p->lock);
return 0;
}
/*
* Shutdown. Clear DMA parameters and shutdown the SSC if there
* are no other substreams open.
*/
static void at32_ssc_shutdown(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct at32_ssc_info *ssc_p = &ssc_info[rtd->dai->cpu_dai->id];
struct at32_pcm_dma_params *dma_params;
int dir_mask;
dma_params = ssc_p->dma_params[substream->stream];
if (dma_params != NULL) {
ssc_writel(dma_params->ssc->regs, CR,
dma_params->mask->ssc_disable);
pr_debug("%s disabled SSC_SR=0x%08x\n",
(substream->stream ? "receiver" : "transmit"),
ssc_readl(ssc_p->ssc->regs, SR));
dma_params->ssc = NULL;
dma_params->substream = NULL;
ssc_p->dma_params[substream->stream] = NULL;
}
dir_mask = 1 << substream->stream;
spin_lock_irq(&ssc_p->lock);
ssc_p->dir_mask &= ~dir_mask;
if (!ssc_p->dir_mask) {
/* Shutdown the SSC clock */
pr_debug("at32-ssc: Stopping user %d clock\n",
ssc_p->ssc->user);
clk_disable(ssc_p->ssc->clk);
if (ssc_p->initialized) {
free_irq(ssc_p->ssc->irq, ssc_p);
ssc_p->initialized = 0;
}
/* Reset the SSC */
ssc_writel(ssc_p->ssc->regs, CR, SSC_BIT(CR_SWRST));
/* clear the SSC dividers */
ssc_p->cmr_div = 0;
ssc_p->tcmr_period = 0;
ssc_p->rcmr_period = 0;
}
spin_unlock_irq(&ssc_p->lock);
}
/*
* Set the SSC system clock rate
*/
static int at32_ssc_set_dai_sysclk(struct snd_soc_dai *cpu_dai,
int clk_id, unsigned int freq, int dir)
{
/* TODO: What the heck do I do here? */
return 0;
}
/*
* Record DAI format for use by hw_params()
*/
static int at32_ssc_set_dai_fmt(struct snd_soc_dai *cpu_dai,
unsigned int fmt)
{
struct at32_ssc_info *ssc_p = &ssc_info[cpu_dai->id];
ssc_p->daifmt = fmt;
return 0;
}
/*
* Record SSC clock dividers for use in hw_params()
*/
static int at32_ssc_set_dai_clkdiv(struct snd_soc_dai *cpu_dai,
int div_id, int div)
{
struct at32_ssc_info *ssc_p = &ssc_info[cpu_dai->id];
switch (div_id) {
case AT32_SSC_CMR_DIV:
/*
* The same master clock divider is used for both
* transmit and receive, so if a value has already
* been set, it must match this value
*/
if (ssc_p->cmr_div == 0)
ssc_p->cmr_div = div;
else if (div != ssc_p->cmr_div)
return -EBUSY;
break;
case AT32_SSC_TCMR_PERIOD:
ssc_p->tcmr_period = div;
break;
case AT32_SSC_RCMR_PERIOD:
ssc_p->rcmr_period = div;
break;
default:
return -EINVAL;
}
return 0;
}
/*
* Configure the SSC
*/
static int at32_ssc_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
int id = rtd->dai->cpu_dai->id;
struct at32_ssc_info *ssc_p = &ssc_info[id];
struct at32_pcm_dma_params *dma_params;
int channels, bits;
u32 tfmr, rfmr, tcmr, rcmr;
int start_event;
int ret;
/*
* Currently, there is only one set of dma_params for each direction.
* If more are added, this code will have to be changed to select
* the proper set
*/
dma_params = &ssc_dma_params[id][substream->stream];
dma_params->ssc = ssc_p->ssc;
dma_params->substream = substream;
ssc_p->dma_params[substream->stream] = dma_params;
/*
* The cpu_dai->dma_data field is only used to communicate the
* appropriate DMA parameters to the PCM driver's hw_params()
* function. It should not be used for other purposes as it
* is common to all substreams.
*/
rtd->dai->cpu_dai->dma_data = dma_params;
channels = params_channels(params);
/*
* Determine sample size in bits and the PDC increment
*/
switch (params_format(params)) {
case SNDRV_PCM_FORMAT_S8:
bits = 8;
dma_params->pdc_xfer_size = 1;
break;
case SNDRV_PCM_FORMAT_S16:
bits = 16;
dma_params->pdc_xfer_size = 2;
break;
case SNDRV_PCM_FORMAT_S24:
bits = 24;
dma_params->pdc_xfer_size = 4;
break;
case SNDRV_PCM_FORMAT_S32:
bits = 32;
dma_params->pdc_xfer_size = 4;
break;
default:
pr_warning("at32-ssc: Unsupported PCM format %d",
params_format(params));
return -EINVAL;
}
pr_debug("at32-ssc: bits = %d, pdc_xfer_size = %d, channels = %d\n",
bits, dma_params->pdc_xfer_size, channels);
/*
* The SSC only supports up to 16-bit samples in I2S format, due
* to the size of the Frame Mode Register FSLEN field.
*/
if ((ssc_p->daifmt & SND_SOC_DAIFMT_FORMAT_MASK) == SND_SOC_DAIFMT_I2S)
if (bits > 16) {
pr_warning("at32-ssc: "
"sample size %d is too large for I2S\n",
bits);
return -EINVAL;
}
/*
* Compute the SSC register settings
*/
switch (ssc_p->daifmt & (SND_SOC_DAIFMT_FORMAT_MASK |
SND_SOC_DAIFMT_MASTER_MASK)) {
case SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBS_CFS:
/*
* I2S format, SSC provides BCLK and LRS clocks.
*
* The SSC transmit and receive clocks are generated from the
* MCK divider, and the BCLK signal is output on the SSC TK line
*/
pr_debug("at32-ssc: SSC mode is I2S BCLK / FRAME master\n");
rcmr = (SSC_BF(RCMR_PERIOD, ssc_p->rcmr_period) |
SSC_BF(RCMR_STTDLY, START_DELAY) |
SSC_BF(RCMR_START, SSC_START_FALLING_RF) |
SSC_BF(RCMR_CKI, SSC_CKI_RISING) |
SSC_BF(RCMR_CKO, SSC_CKO_NONE) |
SSC_BF(RCMR_CKS, SSC_CKS_DIV));
rfmr = (SSC_BF(RFMR_FSEDGE, SSC_FSEDGE_POSITIVE) |
SSC_BF(RFMR_FSOS, SSC_FSOS_NEGATIVE) |
SSC_BF(RFMR_FSLEN, bits - 1) |
SSC_BF(RFMR_DATNB, channels - 1) |
SSC_BIT(RFMR_MSBF) | SSC_BF(RFMR_DATLEN, bits - 1));
tcmr = (SSC_BF(TCMR_PERIOD, ssc_p->tcmr_period) |
SSC_BF(TCMR_STTDLY, START_DELAY) |
SSC_BF(TCMR_START, SSC_START_FALLING_RF) |
SSC_BF(TCMR_CKI, SSC_CKI_FALLING) |
SSC_BF(TCMR_CKO, SSC_CKO_CONTINUOUS) |
SSC_BF(TCMR_CKS, SSC_CKS_DIV));
tfmr = (SSC_BF(TFMR_FSEDGE, SSC_FSEDGE_POSITIVE) |
SSC_BF(TFMR_FSOS, SSC_FSOS_NEGATIVE) |
SSC_BF(TFMR_FSLEN, bits - 1) |
SSC_BF(TFMR_DATNB, channels - 1) | SSC_BIT(TFMR_MSBF) |
SSC_BF(TFMR_DATLEN, bits - 1));
break;
case SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBM_CFM:
/*
* I2S format, CODEC supplies BCLK and LRC clock.
*
* The SSC transmit clock is obtained from the BCLK signal
* on the TK line, and the SSC receive clock is generated from
* the transmit clock.
*
* For single channel data, one sample is transferred on the
* falling edge of the LRC clock. For two channel data, one
* sample is transferred on both edges of the LRC clock.
*/
pr_debug("at32-ssc: SSC mode is I2S BCLK / FRAME slave\n");
start_event = ((channels == 1) ?
SSC_START_FALLING_RF : SSC_START_EDGE_RF);
rcmr = (SSC_BF(RCMR_STTDLY, START_DELAY) |
SSC_BF(RCMR_START, start_event) |
SSC_BF(RCMR_CKI, SSC_CKI_RISING) |
SSC_BF(RCMR_CKO, SSC_CKO_NONE) |
SSC_BF(RCMR_CKS, SSC_CKS_CLOCK));
rfmr = (SSC_BF(RFMR_FSEDGE, SSC_FSEDGE_POSITIVE) |
SSC_BF(RFMR_FSOS, SSC_FSOS_NONE) |
SSC_BIT(RFMR_MSBF) | SSC_BF(RFMR_DATLEN, bits - 1));
tcmr = (SSC_BF(TCMR_STTDLY, START_DELAY) |
SSC_BF(TCMR_START, start_event) |
SSC_BF(TCMR_CKI, SSC_CKI_FALLING) |
SSC_BF(TCMR_CKO, SSC_CKO_NONE) |
SSC_BF(TCMR_CKS, SSC_CKS_PIN));
tfmr = (SSC_BF(TFMR_FSEDGE, SSC_FSEDGE_POSITIVE) |
SSC_BF(TFMR_FSOS, SSC_FSOS_NONE) |
SSC_BIT(TFMR_MSBF) | SSC_BF(TFMR_DATLEN, bits - 1));
break;
case SND_SOC_DAIFMT_DSP_A | SND_SOC_DAIFMT_CBS_CFS:
/*
* DSP/PCM Mode A format, SSC provides BCLK and LRC clocks.
*
* The SSC transmit and receive clocks are generated from the
* MCK divider, and the BCLK signal is output on the SSC TK line
*/
pr_debug("at32-ssc: SSC mode is DSP A BCLK / FRAME master\n");
rcmr = (SSC_BF(RCMR_PERIOD, ssc_p->rcmr_period) |
SSC_BF(RCMR_STTDLY, 1) |
SSC_BF(RCMR_START, SSC_START_RISING_RF) |
SSC_BF(RCMR_CKI, SSC_CKI_RISING) |
SSC_BF(RCMR_CKO, SSC_CKO_NONE) |
SSC_BF(RCMR_CKS, SSC_CKS_DIV));
rfmr = (SSC_BF(RFMR_FSEDGE, SSC_FSEDGE_POSITIVE) |
SSC_BF(RFMR_FSOS, SSC_FSOS_POSITIVE) |
SSC_BF(RFMR_DATNB, channels - 1) |
SSC_BIT(RFMR_MSBF) | SSC_BF(RFMR_DATLEN, bits - 1));
tcmr = (SSC_BF(TCMR_PERIOD, ssc_p->tcmr_period) |
SSC_BF(TCMR_STTDLY, 1) |
SSC_BF(TCMR_START, SSC_START_RISING_RF) |
SSC_BF(TCMR_CKI, SSC_CKI_RISING) |
SSC_BF(TCMR_CKO, SSC_CKO_CONTINUOUS) |
SSC_BF(TCMR_CKS, SSC_CKS_DIV));
tfmr = (SSC_BF(TFMR_FSEDGE, SSC_FSEDGE_POSITIVE) |
SSC_BF(TFMR_FSOS, SSC_FSOS_POSITIVE) |
SSC_BF(TFMR_DATNB, channels - 1) |
SSC_BIT(TFMR_MSBF) | SSC_BF(TFMR_DATLEN, bits - 1));
break;
case SND_SOC_DAIFMT_DSP_A | SND_SOC_DAIFMT_CBM_CFM:
default:
pr_warning("at32-ssc: unsupported DAI format 0x%x\n",
ssc_p->daifmt);
return -EINVAL;
break;
}
pr_debug("at32-ssc: RCMR=%08x RFMR=%08x TCMR=%08x TFMR=%08x\n",
rcmr, rfmr, tcmr, tfmr);
if (!ssc_p->initialized) {
/* enable peripheral clock */
pr_debug("at32-ssc: Starting clock\n");
clk_enable(ssc_p->ssc->clk);
/* Reset the SSC and its PDC registers */
ssc_writel(ssc_p->ssc->regs, CR, SSC_BIT(CR_SWRST));
ssc_writel(ssc_p->ssc->regs, PDC_RPR, 0);
ssc_writel(ssc_p->ssc->regs, PDC_RCR, 0);
ssc_writel(ssc_p->ssc->regs, PDC_RNPR, 0);
ssc_writel(ssc_p->ssc->regs, PDC_RNCR, 0);
ssc_writel(ssc_p->ssc->regs, PDC_TPR, 0);
ssc_writel(ssc_p->ssc->regs, PDC_TCR, 0);
ssc_writel(ssc_p->ssc->regs, PDC_TNPR, 0);
ssc_writel(ssc_p->ssc->regs, PDC_TNCR, 0);
ret = request_irq(ssc_p->ssc->irq, at32_ssc_interrupt, 0,
ssc_p->name, ssc_p);
if (ret < 0) {
pr_warning("at32-ssc: request irq failed (%d)\n", ret);
pr_debug("at32-ssc: Stopping clock\n");
clk_disable(ssc_p->ssc->clk);
return ret;
}
ssc_p->initialized = 1;
}
/* Set SSC clock mode register */
ssc_writel(ssc_p->ssc->regs, CMR, ssc_p->cmr_div);
/* set receive clock mode and format */
ssc_writel(ssc_p->ssc->regs, RCMR, rcmr);
ssc_writel(ssc_p->ssc->regs, RFMR, rfmr);
/* set transmit clock mode and format */
ssc_writel(ssc_p->ssc->regs, TCMR, tcmr);
ssc_writel(ssc_p->ssc->regs, TFMR, tfmr);
pr_debug("at32-ssc: SSC initialized\n");
return 0;
}
static int at32_ssc_prepare(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct at32_ssc_info *ssc_p = &ssc_info[rtd->dai->cpu_dai->id];
struct at32_pcm_dma_params *dma_params;
dma_params = ssc_p->dma_params[substream->stream];
ssc_writel(dma_params->ssc->regs, CR, dma_params->mask->ssc_enable);
return 0;
}
#ifdef CONFIG_PM
static int at32_ssc_suspend(struct platform_device *pdev,
struct snd_soc_dai *cpu_dai)
{
struct at32_ssc_info *ssc_p;
if (!cpu_dai->active)
return 0;
ssc_p = &ssc_info[cpu_dai->id];
/* Save the status register before disabling transmit and receive */
ssc_p->ssc_state.ssc_sr = ssc_readl(ssc_p->ssc->regs, SR);
ssc_writel(ssc_p->ssc->regs, CR, SSC_BIT(CR_TXDIS) | SSC_BIT(CR_RXDIS));
/* Save the current interrupt mask, then disable unmasked interrupts */
ssc_p->ssc_state.ssc_imr = ssc_readl(ssc_p->ssc->regs, IMR);
ssc_writel(ssc_p->ssc->regs, IDR, ssc_p->ssc_state.ssc_imr);
ssc_p->ssc_state.ssc_cmr = ssc_readl(ssc_p->ssc->regs, CMR);
ssc_p->ssc_state.ssc_rcmr = ssc_readl(ssc_p->ssc->regs, RCMR);
ssc_p->ssc_state.ssc_rfmr = ssc_readl(ssc_p->ssc->regs, RFMR);
ssc_p->ssc_state.ssc_tcmr = ssc_readl(ssc_p->ssc->regs, TCMR);
ssc_p->ssc_state.ssc_tfmr = ssc_readl(ssc_p->ssc->regs, TFMR);
return 0;
}
static int at32_ssc_resume(struct platform_device *pdev,
struct snd_soc_dai *cpu_dai)
{
struct at32_ssc_info *ssc_p;
u32 cr;
if (!cpu_dai->active)
return 0;
ssc_p = &ssc_info[cpu_dai->id];
/* restore SSC register settings */
ssc_writel(ssc_p->ssc->regs, TFMR, ssc_p->ssc_state.ssc_tfmr);
ssc_writel(ssc_p->ssc->regs, TCMR, ssc_p->ssc_state.ssc_tcmr);
ssc_writel(ssc_p->ssc->regs, RFMR, ssc_p->ssc_state.ssc_rfmr);
ssc_writel(ssc_p->ssc->regs, RCMR, ssc_p->ssc_state.ssc_rcmr);
ssc_writel(ssc_p->ssc->regs, CMR, ssc_p->ssc_state.ssc_cmr);
/* re-enable interrupts */
ssc_writel(ssc_p->ssc->regs, IER, ssc_p->ssc_state.ssc_imr);
/* Re-enable recieve and transmit as appropriate */
cr = 0;
cr |=
(ssc_p->ssc_state.ssc_sr & SSC_BIT(SR_RXEN)) ? SSC_BIT(CR_RXEN) : 0;
cr |=
(ssc_p->ssc_state.ssc_sr & SSC_BIT(SR_TXEN)) ? SSC_BIT(CR_TXEN) : 0;
ssc_writel(ssc_p->ssc->regs, CR, cr);
return 0;
}
#else /* CONFIG_PM */
# define at32_ssc_suspend NULL
# define at32_ssc_resume NULL
#endif /* CONFIG_PM */
#define AT32_SSC_RATES \
(SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \
SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
#define AT32_SSC_FORMATS \
(SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16 | \
SNDRV_PCM_FMTBIT_S24 | SNDRV_PCM_FMTBIT_S32)
struct snd_soc_dai at32_ssc_dai[NUM_SSC_DEVICES] = {
{
.name = "at32-ssc0",
.id = 0,
.type = SND_SOC_DAI_PCM,
.suspend = at32_ssc_suspend,
.resume = at32_ssc_resume,
.playback = {
.channels_min = 1,
.channels_max = 2,
.rates = AT32_SSC_RATES,
.formats = AT32_SSC_FORMATS,
},
.capture = {
.channels_min = 1,
.channels_max = 2,
.rates = AT32_SSC_RATES,
.formats = AT32_SSC_FORMATS,
},
.ops = {
.startup = at32_ssc_startup,
.shutdown = at32_ssc_shutdown,
.prepare = at32_ssc_prepare,
.hw_params = at32_ssc_hw_params,
},
.dai_ops = {
.set_sysclk = at32_ssc_set_dai_sysclk,
.set_fmt = at32_ssc_set_dai_fmt,
.set_clkdiv = at32_ssc_set_dai_clkdiv,
},
.private_data = &ssc_info[0],
},
{
.name = "at32-ssc1",
.id = 1,
.type = SND_SOC_DAI_PCM,
.suspend = at32_ssc_suspend,
.resume = at32_ssc_resume,
.playback = {
.channels_min = 1,
.channels_max = 2,
.rates = AT32_SSC_RATES,
.formats = AT32_SSC_FORMATS,
},
.capture = {
.channels_min = 1,
.channels_max = 2,
.rates = AT32_SSC_RATES,
.formats = AT32_SSC_FORMATS,
},
.ops = {
.startup = at32_ssc_startup,
.shutdown = at32_ssc_shutdown,
.prepare = at32_ssc_prepare,
.hw_params = at32_ssc_hw_params,
},
.dai_ops = {
.set_sysclk = at32_ssc_set_dai_sysclk,
.set_fmt = at32_ssc_set_dai_fmt,
.set_clkdiv = at32_ssc_set_dai_clkdiv,
},
.private_data = &ssc_info[1],
},
{
.name = "at32-ssc2",
.id = 2,
.type = SND_SOC_DAI_PCM,
.suspend = at32_ssc_suspend,
.resume = at32_ssc_resume,
.playback = {
.channels_min = 1,
.channels_max = 2,
.rates = AT32_SSC_RATES,
.formats = AT32_SSC_FORMATS,
},
.capture = {
.channels_min = 1,
.channels_max = 2,
.rates = AT32_SSC_RATES,
.formats = AT32_SSC_FORMATS,
},
.ops = {
.startup = at32_ssc_startup,
.shutdown = at32_ssc_shutdown,
.prepare = at32_ssc_prepare,
.hw_params = at32_ssc_hw_params,
},
.dai_ops = {
.set_sysclk = at32_ssc_set_dai_sysclk,
.set_fmt = at32_ssc_set_dai_fmt,
.set_clkdiv = at32_ssc_set_dai_clkdiv,
},
.private_data = &ssc_info[2],
},
};
EXPORT_SYMBOL_GPL(at32_ssc_dai);
MODULE_AUTHOR("Geoffrey Wossum <gwossum@acm.org>");
MODULE_DESCRIPTION("AT32 SSC ASoC Interface");
MODULE_LICENSE("GPL");
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