// SPDX-License-Identifier: GPL-2.0-only
/*
* Driver for Atmel AC97C
*
* Copyright (C) 2005-2009 Atmel Corporation
*/
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/bitmap.h>
#include <linux/device.h>
#include <linux/atmel_pdc.h>
#include <linux/gpio/consumer.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/mutex.h>
#include <linux/types.h>
#include <linux/io.h>
#include <sound/core.h>
#include <sound/initval.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/ac97_codec.h>
#include <sound/memalloc.h>
#include "ac97c.h"
/* Serialize access to opened variable */
static DEFINE_MUTEX(opened_mutex);
struct atmel_ac97c {
struct clk *pclk;
struct platform_device *pdev;
struct snd_pcm_substream *playback_substream;
struct snd_pcm_substream *capture_substream;
struct snd_card *card;
struct snd_pcm *pcm;
struct snd_ac97 *ac97;
struct snd_ac97_bus *ac97_bus;
u64 cur_format;
unsigned int cur_rate;
int playback_period, capture_period;
/* Serialize access to opened variable */
spinlock_t lock;
void __iomem *regs;
int irq;
int opened;
struct gpio_desc *reset_pin;
};
#define get_chip(card) ((struct atmel_ac97c *)(card)->private_data)
#define ac97c_writel(chip, reg, val) \
__raw_writel((val), (chip)->regs + AC97C_##reg)
#define ac97c_readl(chip, reg) \
__raw_readl((chip)->regs + AC97C_##reg)
static const struct snd_pcm_hardware atmel_ac97c_hw = {
.info = (SNDRV_PCM_INFO_MMAP
| SNDRV_PCM_INFO_MMAP_VALID
| SNDRV_PCM_INFO_INTERLEAVED
| SNDRV_PCM_INFO_BLOCK_TRANSFER
| SNDRV_PCM_INFO_JOINT_DUPLEX
| SNDRV_PCM_INFO_RESUME
| SNDRV_PCM_INFO_PAUSE),
.formats = (SNDRV_PCM_FMTBIT_S16_BE
| SNDRV_PCM_FMTBIT_S16_LE),
.rates = (SNDRV_PCM_RATE_CONTINUOUS),
.rate_min = 4000,
.rate_max = 48000,
.channels_min = 1,
.channels_max = 2,
.buffer_bytes_max = 2 * 2 * 64 * 2048,
.period_bytes_min = 4096,
.period_bytes_max = 4096,
.periods_min = 6,
.periods_max = 64,
};
static int atmel_ac97c_playback_open(struct snd_pcm_substream *substream)
{
struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
struct snd_pcm_runtime *runtime = substream->runtime;
mutex_lock(&opened_mutex);
chip->opened++;
runtime->hw = atmel_ac97c_hw;
if (chip->cur_rate) {
runtime->hw.rate_min = chip->cur_rate;
runtime->hw.rate_max = chip->cur_rate;
}
if (chip->cur_format)
runtime->hw.formats = pcm_format_to_bits(chip->cur_format);
mutex_unlock(&opened_mutex);
chip->playback_substream = substream;
return 0;
}
static int atmel_ac97c_capture_open(struct snd_pcm_substream *substream)
{
struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
struct snd_pcm_runtime *runtime = substream->runtime;
mutex_lock(&opened_mutex);
chip->opened++;
runtime->hw = atmel_ac97c_hw;
if (chip->cur_rate) {
runtime->hw.rate_min = chip->cur_rate;
runtime->hw.rate_max = chip->cur_rate;
}
if (chip->cur_format)
runtime->hw.formats = pcm_format_to_bits(chip->cur_format);
mutex_unlock(&opened_mutex);
chip->capture_substream = substream;
return 0;
}
static int atmel_ac97c_playback_close(struct snd_pcm_substream *substream)
{
struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
mutex_lock(&opened_mutex);
chip->opened--;
if (!chip->opened) {
chip->cur_rate = 0;
chip->cur_format = 0;
}
mutex_unlock(&opened_mutex);
chip->playback_substream = NULL;
return 0;
}
static int atmel_ac97c_capture_close(struct snd_pcm_substream *substream)
{
struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
mutex_lock(&opened_mutex);
chip->opened--;
if (!chip->opened) {
chip->cur_rate = 0;
chip->cur_format = 0;
}
mutex_unlock(&opened_mutex);
chip->capture_substream = NULL;
return 0;
}
static int atmel_ac97c_playback_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *hw_params)
{
struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
/* Set restrictions to params. */
mutex_lock(&opened_mutex);
chip->cur_rate = params_rate(hw_params);
chip->cur_format = params_format(hw_params);
mutex_unlock(&opened_mutex);
return 0;
}
static int atmel_ac97c_capture_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *hw_params)
{
struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
/* Set restrictions to params. */
mutex_lock(&opened_mutex);
chip->cur_rate = params_rate(hw_params);
chip->cur_format = params_format(hw_params);
mutex_unlock(&opened_mutex);
return 0;
}
static int atmel_ac97c_playback_prepare(struct snd_pcm_substream *substream)
{
struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
struct snd_pcm_runtime *runtime = substream->runtime;
int block_size = frames_to_bytes(runtime, runtime->period_size);
unsigned long word = ac97c_readl(chip, OCA);
int retval;
chip->playback_period = 0;
word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
/* assign channels to AC97C channel A */
switch (runtime->channels) {
case 1:
word |= AC97C_CH_ASSIGN(PCM_LEFT, A);
break;
case 2:
word |= AC97C_CH_ASSIGN(PCM_LEFT, A)
| AC97C_CH_ASSIGN(PCM_RIGHT, A);
break;
default:
/* TODO: support more than two channels */
return -EINVAL;
}
ac97c_writel(chip, OCA, word);
/* configure sample format and size */
word = ac97c_readl(chip, CAMR);
if (chip->opened <= 1)
word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
else
word |= AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
switch (runtime->format) {
case SNDRV_PCM_FORMAT_S16_LE:
break;
case SNDRV_PCM_FORMAT_S16_BE:
word &= ~(AC97C_CMR_CEM_LITTLE);
break;
default:
word = ac97c_readl(chip, OCA);
word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
ac97c_writel(chip, OCA, word);
return -EINVAL;
}
/* Enable underrun interrupt on channel A */
word |= AC97C_CSR_UNRUN;
ac97c_writel(chip, CAMR, word);
/* Enable channel A event interrupt */
word = ac97c_readl(chip, IMR);
word |= AC97C_SR_CAEVT;
ac97c_writel(chip, IER, word);
/* set variable rate if needed */
if (runtime->rate != 48000) {
word = ac97c_readl(chip, MR);
word |= AC97C_MR_VRA;
ac97c_writel(chip, MR, word);
} else {
word = ac97c_readl(chip, MR);
word &= ~(AC97C_MR_VRA);
ac97c_writel(chip, MR, word);
}
retval = snd_ac97_set_rate(chip->ac97, AC97_PCM_FRONT_DAC_RATE,
runtime->rate);
if (retval)
dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n",
runtime->rate);
/* Initialize and start the PDC */
writel(runtime->dma_addr, chip->regs + ATMEL_PDC_TPR);
writel(block_size / 2, chip->regs + ATMEL_PDC_TCR);
writel(runtime->dma_addr + block_size, chip->regs + ATMEL_PDC_TNPR);
writel(block_size / 2, chip->regs + ATMEL_PDC_TNCR);
return retval;
}
static int atmel_ac97c_capture_prepare(struct snd_pcm_substream *substream)
{
struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
struct snd_pcm_runtime *runtime = substream->runtime;
int block_size = frames_to_bytes(runtime, runtime->period_size);
unsigned long word = ac97c_readl(chip, ICA);
int retval;
chip->capture_period = 0;
word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
/* assign channels to AC97C channel A */
switch (runtime->channels) {
case 1:
word |= AC97C_CH_ASSIGN(PCM_LEFT, A);
break;
case 2:
word |= AC97C_CH_ASSIGN(PCM_LEFT, A)
| AC97C_CH_ASSIGN(PCM_RIGHT, A);
break;
default:
/* TODO: support more than two channels */
return -EINVAL;
}
ac97c_writel(chip, ICA, word);
/* configure sample format and size */
word = ac97c_readl(chip, CAMR);
if (chip->opened <= 1)
word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
else
word |= AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
switch (runtime->format) {
case SNDRV_PCM_FORMAT_S16_LE:
break;
case SNDRV_PCM_FORMAT_S16_BE:
word &= ~(AC97C_CMR_CEM_LITTLE);
break;
default:
word = ac97c_readl(chip, ICA);
word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
ac97c_writel(chip, ICA, word);
return -EINVAL;
}
/* Enable overrun interrupt on channel A */
word |= AC97C_CSR_OVRUN;
ac97c_writel(chip, CAMR, word);
/* Enable channel A event interrupt */
word = ac97c_readl(chip, IMR);
word |= AC97C_SR_CAEVT;
ac97c_writel(chip, IER, word);
/* set variable rate if needed */
if (runtime->rate != 48000) {
word = ac97c_readl(chip, MR);
word |= AC97C_MR_VRA;
ac97c_writel(chip, MR, word);
} else {
word = ac97c_readl(chip, MR);
word &= ~(AC97C_MR_VRA);
ac97c_writel(chip, MR, word);
}
retval = snd_ac97_set_rate(chip->ac97, AC97_PCM_LR_ADC_RATE,
runtime->rate);
if (retval)
dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n",
runtime->rate);
/* Initialize and start the PDC */
writel(runtime->dma_addr, chip->regs + ATMEL_PDC_RPR);
writel(block_size / 2, chip->regs + ATMEL_PDC_RCR);
writel(runtime->dma_addr + block_size, chip->regs + ATMEL_PDC_RNPR);
writel(block_size / 2, chip->regs + ATMEL_PDC_RNCR);
return retval;
}
static int
atmel_ac97c_playback_trigger(struct snd_pcm_substream *substream, int cmd)
{
struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
unsigned long camr, ptcr = 0;
camr = ac97c_readl(chip, CAMR);
switch (cmd) {
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_START:
ptcr = ATMEL_PDC_TXTEN;
camr |= AC97C_CMR_CENA | AC97C_CSR_ENDTX;
break;
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_STOP:
ptcr |= ATMEL_PDC_TXTDIS;
if (chip->opened <= 1)
camr &= ~AC97C_CMR_CENA;
break;
default:
return -EINVAL;
}
ac97c_writel(chip, CAMR, camr);
writel(ptcr, chip->regs + ATMEL_PDC_PTCR);
return 0;
}
static int
atmel_ac97c_capture_trigger(struct snd_pcm_substream *substream, int cmd)
{
struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
unsigned long camr, ptcr = 0;
camr = ac97c_readl(chip, CAMR);
ptcr = readl(chip->regs + ATMEL_PDC_PTSR);
switch (cmd) {
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_START:
ptcr = ATMEL_PDC_RXTEN;
camr |= AC97C_CMR_CENA | AC97C_CSR_ENDRX;
break;
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_STOP:
ptcr |= ATMEL_PDC_RXTDIS;
if (chip->opened <= 1)
camr &= ~AC97C_CMR_CENA;
break;
default:
return -EINVAL;
}
ac97c_writel(chip, CAMR, camr);
writel(ptcr, chip->regs + ATMEL_PDC_PTCR);
return 0;
}
static snd_pcm_uframes_t
atmel_ac97c_playback_pointer(struct snd_pcm_substream *substream)
{
struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
struct snd_pcm_runtime *runtime = substream->runtime;
snd_pcm_uframes_t frames;
unsigned long bytes;
bytes = readl(chip->regs + ATMEL_PDC_TPR);
bytes -= runtime->dma_addr;
frames = bytes_to_frames(runtime, bytes);
if (frames >= runtime->buffer_size)
frames -= runtime->buffer_size;
return frames;
}
static snd_pcm_uframes_t
atmel_ac97c_capture_pointer(struct snd_pcm_substream *substream)
{
struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
struct snd_pcm_runtime *runtime = substream->runtime;
snd_pcm_uframes_t frames;
unsigned long bytes;
bytes = readl(chip->regs + ATMEL_PDC_RPR);
bytes -= runtime->dma_addr;
frames = bytes_to_frames(runtime, bytes);
if (frames >= runtime->buffer_size)
frames -= runtime->buffer_size;
return frames;
}
static const struct snd_pcm_ops atmel_ac97_playback_ops = {
.open = atmel_ac97c_playback_open,
.close = atmel_ac97c_playback_close,
.hw_params = atmel_ac97c_playback_hw_params,
.prepare = atmel_ac97c_playback_prepare,
.trigger = atmel_ac97c_playback_trigger,
.pointer = atmel_ac97c_playback_pointer,
};
static const struct snd_pcm_ops atmel_ac97_capture_ops = {
.open = atmel_ac97c_capture_open,
.close = atmel_ac97c_capture_close,
.hw_params = atmel_ac97c_capture_hw_params,
.prepare = atmel_ac97c_capture_prepare,
.trigger = atmel_ac97c_capture_trigger,
.pointer = atmel_ac97c_capture_pointer,
};
static irqreturn_t atmel_ac97c_interrupt(int irq, void *dev)
{
struct atmel_ac97c *chip = (struct atmel_ac97c *)dev;
irqreturn_t retval = IRQ_NONE;
u32 sr = ac97c_readl(chip, SR);
u32 casr = ac97c_readl(chip, CASR);
u32 cosr = ac97c_readl(chip, COSR);
u32 camr = ac97c_readl(chip, CAMR);
if (sr & AC97C_SR_CAEVT) {
struct snd_pcm_runtime *runtime;
int offset, next_period, block_size;
dev_dbg(&chip->pdev->dev, "channel A event%s%s%s%s%s%s\n",
(casr & AC97C_CSR_OVRUN) ? " OVRUN" : "",
(casr & AC97C_CSR_RXRDY) ? " RXRDY" : "",
(casr & AC97C_CSR_UNRUN) ? " UNRUN" : "",
(casr & AC97C_CSR_TXEMPTY) ? " TXEMPTY" : "",
(casr & AC97C_CSR_TXRDY) ? " TXRDY" : "",
!casr ? " NONE" : "");
if ((casr & camr) & AC97C_CSR_ENDTX) {
runtime = chip->playback_substream->runtime;
block_size = frames_to_bytes(runtime, runtime->period_size);
chip->playback_period++;
if (chip->playback_period == runtime->periods)
chip->playback_period = 0;
next_period = chip->playback_period + 1;
if (next_period == runtime->periods)
next_period = 0;
offset = block_size * next_period;
writel(runtime->dma_addr + offset, chip->regs + ATMEL_PDC_TNPR);
writel(block_size / 2, chip->regs + ATMEL_PDC_TNCR);
snd_pcm_period_elapsed(chip->playback_substream);
}
if ((casr & camr) & AC97C_CSR_ENDRX) {
runtime = chip->capture_substream->runtime;
block_size = frames_to_bytes(runtime, runtime->period_size);
chip->capture_period++;
if (chip->capture_period == runtime->periods)
chip->capture_period = 0;
next_period = chip->capture_period + 1;
if (next_period == runtime->periods)
next_period = 0;
offset = block_size * next_period;
writel(runtime->dma_addr + offset, chip->regs + ATMEL_PDC_RNPR);
writel(block_size / 2, chip->regs + ATMEL_PDC_RNCR);
snd_pcm_period_elapsed(chip->capture_substream);
}
retval = IRQ_HANDLED;
}
if (sr & AC97C_SR_COEVT) {
dev_info(&chip->pdev->dev, "codec channel event%s%s%s%s%s\n",
(cosr & AC97C_CSR_OVRUN) ? " OVRUN" : "",
(cosr & AC97C_CSR_RXRDY) ? " RXRDY" : "",
(cosr & AC97C_CSR_TXEMPTY) ? " TXEMPTY" : "",
(cosr & AC97C_CSR_TXRDY) ? " TXRDY" : "",
!cosr ? " NONE" : "");
retval = IRQ_HANDLED;
}
if (retval == IRQ_NONE) {
dev_err(&chip->pdev->dev, "spurious interrupt sr 0x%08x "
"casr 0x%08x cosr 0x%08x\n", sr, casr, cosr);
}
return retval;
}
static const struct ac97_pcm at91_ac97_pcm_defs[] = {
/* Playback */
{
.exclusive = 1,
.r = { {
.slots = ((1 << AC97_SLOT_PCM_LEFT)
| (1 << AC97_SLOT_PCM_RIGHT)),
} },
},
/* PCM in */
{
.stream = 1,
.exclusive = 1,
.r = { {
.slots = ((1 << AC97_SLOT_PCM_LEFT)
| (1 << AC97_SLOT_PCM_RIGHT)),
} }
},
/* Mic in */
{
.stream = 1,
.exclusive = 1,
.r = { {
.slots = (1<<AC97_SLOT_MIC),
} }
},
};
static int atmel_ac97c_pcm_new(struct atmel_ac97c *chip)
{
struct snd_pcm *pcm;
struct snd_pcm_hardware hw = atmel_ac97c_hw;
int retval;
retval = snd_ac97_pcm_assign(chip->ac97_bus,
ARRAY_SIZE(at91_ac97_pcm_defs),
at91_ac97_pcm_defs);
if (retval)
return retval;
retval = snd_pcm_new(chip->card, chip->card->shortname, 0, 1, 1, &pcm);
if (retval)
return retval;
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &atmel_ac97_capture_ops);
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &atmel_ac97_playback_ops);
snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV,
&chip->pdev->dev, hw.periods_min * hw.period_bytes_min,
hw.buffer_bytes_max);
pcm->private_data = chip;
pcm->info_flags = 0;
strcpy(pcm->name, chip->card->shortname);
chip->pcm = pcm;
return 0;
}
static int atmel_ac97c_mixer_new(struct atmel_ac97c *chip)
{
struct snd_ac97_template template;
memset(&template, 0, sizeof(template));
template.private_data = chip;
return snd_ac97_mixer(chip->ac97_bus, &template, &chip->ac97);
}
static void atmel_ac97c_write(struct snd_ac97 *ac97, unsigned short reg,
unsigned short val)
{
struct atmel_ac97c *chip = get_chip(ac97);
unsigned long word;
int timeout = 40;
word = (reg & 0x7f) << 16 | val;
do {
if (ac97c_readl(chip, COSR) & AC97C_CSR_TXRDY) {
ac97c_writel(chip, COTHR, word);
return;
}
udelay(1);
} while (--timeout);
dev_dbg(&chip->pdev->dev, "codec write timeout\n");
}
static unsigned short atmel_ac97c_read(struct snd_ac97 *ac97,
unsigned short reg)
{
struct atmel_ac97c *chip = get_chip(ac97);
unsigned long word;
int timeout = 40;
int write = 10;
word = (0x80 | (reg & 0x7f)) << 16;
if ((ac97c_readl(chip, COSR) & AC97C_CSR_RXRDY) != 0)
ac97c_readl(chip, CORHR);
retry_write:
timeout = 40;
do {
if ((ac97c_readl(chip, COSR) & AC97C_CSR_TXRDY) != 0) {
ac97c_writel(chip, COTHR, word);
goto read_reg;
}
udelay(10);
} while (--timeout);
if (!--write)
goto timed_out;
goto retry_write;
read_reg:
do {
if ((ac97c_readl(chip, COSR) & AC97C_CSR_RXRDY) != 0) {
unsigned short val = ac97c_readl(chip, CORHR);
return val;
}
udelay(10);
} while (--timeout);
if (!--write)
goto timed_out;
goto retry_write;
timed_out:
dev_dbg(&chip->pdev->dev, "codec read timeout\n");
return 0xffff;
}
static void atmel_ac97c_reset(struct atmel_ac97c *chip)
{
ac97c_writel(chip, MR, 0);
ac97c_writel(chip, MR, AC97C_MR_ENA);
ac97c_writel(chip, CAMR, 0);
ac97c_writel(chip, COMR, 0);
if (!IS_ERR(chip->reset_pin)) {
gpiod_set_value(chip->reset_pin, 0);
/* AC97 v2.2 specifications says minimum 1 us. */
udelay(2);
gpiod_set_value(chip->reset_pin, 1);
} else {
ac97c_writel(chip, MR, AC97C_MR_WRST | AC97C_MR_ENA);
udelay(2);
ac97c_writel(chip, MR, AC97C_MR_ENA);
}
}
static const struct of_device_id atmel_ac97c_dt_ids[] = {
{ .compatible = "atmel,at91sam9263-ac97c", },
{ }
};
MODULE_DEVICE_TABLE(of, atmel_ac97c_dt_ids);
static int atmel_ac97c_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct snd_card *card;
struct atmel_ac97c *chip;
struct resource *regs;
struct clk *pclk;
static const struct snd_ac97_bus_ops ops = {
.write = atmel_ac97c_write,
.read = atmel_ac97c_read,
};
int retval;
int irq;
regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!regs) {
dev_dbg(&pdev->dev, "no memory resource\n");
return -ENXIO;
}
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
dev_dbg(&pdev->dev, "could not get irq: %d\n", irq);
return irq;
}
pclk = clk_get(&pdev->dev, "ac97_clk");
if (IS_ERR(pclk)) {
dev_dbg(&pdev->dev, "no peripheral clock\n");
return PTR_ERR(pclk);
}
retval = clk_prepare_enable(pclk);
if (retval)
goto err_prepare_enable;
retval = snd_card_new(&pdev->dev, SNDRV_DEFAULT_IDX1,
SNDRV_DEFAULT_STR1, THIS_MODULE,
sizeof(struct atmel_ac97c), &card);
if (retval) {
dev_dbg(&pdev->dev, "could not create sound card device\n");
goto err_snd_card_new;
}
chip = get_chip(card);
retval = request_irq(irq, atmel_ac97c_interrupt, 0, "AC97C", chip);
if (retval) {
dev_dbg(&pdev->dev, "unable to request irq %d\n", irq);
goto err_request_irq;
}
chip->irq = irq;
spin_lock_init(&chip->lock);
strcpy(card->driver, "Atmel AC97C");
strcpy(card->shortname, "Atmel AC97C");
sprintf(card->longname, "Atmel AC97 controller");
chip->card = card;
chip->pclk = pclk;
chip->pdev = pdev;
chip->regs = ioremap(regs->start, resource_size(regs));
if (!chip->regs) {
dev_dbg(&pdev->dev, "could not remap register memory\n");
retval = -ENOMEM;
goto err_ioremap;
}
chip->reset_pin = devm_gpiod_get_index(dev, "ac97", 2, GPIOD_OUT_HIGH);
if (IS_ERR(chip->reset_pin))
dev_dbg(dev, "reset pin not available\n");
atmel_ac97c_reset(chip);
/* Enable overrun interrupt from codec channel */
ac97c_writel(chip, COMR, AC97C_CSR_OVRUN);
ac97c_writel(chip, IER, ac97c_readl(chip, IMR) | AC97C_SR_COEVT);
retval = snd_ac97_bus(card, 0, &ops, chip, &chip->ac97_bus);
if (retval) {
dev_dbg(&pdev->dev, "could not register on ac97 bus\n");
goto err_ac97_bus;
}
retval = atmel_ac97c_mixer_new(chip);
if (retval) {
dev_dbg(&pdev->dev, "could not register ac97 mixer\n");
goto err_ac97_bus;
}
retval = atmel_ac97c_pcm_new(chip);
if (retval) {
dev_dbg(&pdev->dev, "could not register ac97 pcm device\n");
goto err_ac97_bus;
}
retval = snd_card_register(card);
if (retval) {
dev_dbg(&pdev->dev, "could not register sound card\n");
goto err_ac97_bus;
}
platform_set_drvdata(pdev, card);
dev_info(&pdev->dev, "Atmel AC97 controller at 0x%p, irq = %d\n",
chip->regs, irq);
return 0;
err_ac97_bus:
iounmap(chip->regs);
err_ioremap:
free_irq(irq, chip);
err_request_irq:
snd_card_free(card);
err_snd_card_new:
clk_disable_unprepare(pclk);
err_prepare_enable:
clk_put(pclk);
return retval;
}
#ifdef CONFIG_PM_SLEEP
static int atmel_ac97c_suspend(struct device *pdev)
{
struct snd_card *card = dev_get_drvdata(pdev);
struct atmel_ac97c *chip = card->private_data;
clk_disable_unprepare(chip->pclk);
return 0;
}
static int atmel_ac97c_resume(struct device *pdev)
{
struct snd_card *card = dev_get_drvdata(pdev);
struct atmel_ac97c *chip = card->private_data;
int ret = clk_prepare_enable(chip->pclk);
return ret;
}
static SIMPLE_DEV_PM_OPS(atmel_ac97c_pm, atmel_ac97c_suspend, atmel_ac97c_resume);
#define ATMEL_AC97C_PM_OPS &atmel_ac97c_pm
#else
#define ATMEL_AC97C_PM_OPS NULL
#endif
static void atmel_ac97c_remove(struct platform_device *pdev)
{
struct snd_card *card = platform_get_drvdata(pdev);
struct atmel_ac97c *chip = get_chip(card);
ac97c_writel(chip, CAMR, 0);
ac97c_writel(chip, COMR, 0);
ac97c_writel(chip, MR, 0);
clk_disable_unprepare(chip->pclk);
clk_put(chip->pclk);
iounmap(chip->regs);
free_irq(chip->irq, chip);
snd_card_free(card);
}
static struct platform_driver atmel_ac97c_driver = {
.probe = atmel_ac97c_probe,
.remove_new = atmel_ac97c_remove,
.driver = {
.name = "atmel_ac97c",
.pm = ATMEL_AC97C_PM_OPS,
.of_match_table = atmel_ac97c_dt_ids,
},
};
module_platform_driver(atmel_ac97c_driver);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Driver for Atmel AC97 controller");
MODULE_AUTHOR("Hans-Christian Egtvedt <[email protected]>");
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