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ASoC: ti: davinci-mcasp: Add support for GPIO mode of the pins 

All McASP pin can be configured as GPIO.
Add gpiochip support for McASP and only enable it when the
gpio-controller is present in the DT node.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Peter Ujfalusi 2019-01-03 16:05:52 +02:00 committed by Mark Brown
parent 4664b94c98
commit 540f1ba7b3
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 156 additions and 3 deletions
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159
sound/soc/ti/davinci-mcasp.c
View File

@ -29,6 +29,7 @@
#include <linux/platform_data/davinci_asp.h>
#include <linux/math64.h>
#include <linux/bitmap.h>
#include <linux/gpio/driver.h>
#include <sound/asoundef.h>
#include <sound/core.h>
@ -54,6 +55,7 @@ static u32 context_regs[] = {
DAVINCI_MCASP_AHCLKXCTL_REG,
DAVINCI_MCASP_AHCLKRCTL_REG,
DAVINCI_MCASP_PDIR_REG,
DAVINCI_MCASP_PFUNC_REG,
DAVINCI_MCASP_RXMASK_REG,
DAVINCI_MCASP_TXMASK_REG,
DAVINCI_MCASP_RXTDM_REG,
@ -108,6 +110,10 @@ struct davinci_mcasp {
/* Used for comstraint setting on the second stream */
u32 channels;
#ifdef CONFIG_GPIOLIB
struct gpio_chip gpio_chip;
#endif
#ifdef CONFIG_PM
struct davinci_mcasp_context context;
#endif
@ -818,9 +824,6 @@ static int mcasp_common_hw_param(struct davinci_mcasp *mcasp, int stream,
if (mcasp->version < MCASP_VERSION_3)
mcasp_set_bits(mcasp, DAVINCI_MCASP_PWREMUMGT_REG, MCASP_SOFT);
/* All PINS as McASP */
mcasp_set_reg(mcasp, DAVINCI_MCASP_PFUNC_REG, 0x00000000);
if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
mcasp_set_reg(mcasp, DAVINCI_MCASP_TXSTAT_REG, 0xFFFFFFFF);
mcasp_clr_bits(mcasp, DAVINCI_MCASP_XEVTCTL_REG, TXDATADMADIS);
@ -1845,6 +1848,147 @@ static u32 davinci_mcasp_rxdma_offset(struct davinci_mcasp_pdata *pdata)
return offset;
}
#ifdef CONFIG_GPIOLIB
static int davinci_mcasp_gpio_request(struct gpio_chip *chip, unsigned offset)
{
struct davinci_mcasp *mcasp = gpiochip_get_data(chip);
if (mcasp->num_serializer && offset < mcasp->num_serializer &&
mcasp->serial_dir[offset] != INACTIVE_MODE) {
dev_err(mcasp->dev, "AXR%u pin is used for audio\n", offset);
return -EBUSY;
}
/* Do not change the PIN yet */
return pm_runtime_get_sync(mcasp->dev);
}
static void davinci_mcasp_gpio_free(struct gpio_chip *chip, unsigned offset)
{
struct davinci_mcasp *mcasp = gpiochip_get_data(chip);
/* Set the direction to input */
mcasp_clr_bits(mcasp, DAVINCI_MCASP_PDIR_REG, BIT(offset));
/* Set the pin as McASP pin */
mcasp_clr_bits(mcasp, DAVINCI_MCASP_PFUNC_REG, BIT(offset));
pm_runtime_put_sync(mcasp->dev);
}
static int davinci_mcasp_gpio_direction_out(struct gpio_chip *chip,
unsigned offset, int value)
{
struct davinci_mcasp *mcasp = gpiochip_get_data(chip);
u32 val;
if (value)
mcasp_set_bits(mcasp, DAVINCI_MCASP_PDOUT_REG, BIT(offset));
else
mcasp_clr_bits(mcasp, DAVINCI_MCASP_PDOUT_REG, BIT(offset));
val = mcasp_get_reg(mcasp, DAVINCI_MCASP_PFUNC_REG);
if (!(val & BIT(offset))) {
/* Set the pin as GPIO pin */
mcasp_set_bits(mcasp, DAVINCI_MCASP_PFUNC_REG, BIT(offset));
/* Set the direction to output */
mcasp_set_bits(mcasp, DAVINCI_MCASP_PDIR_REG, BIT(offset));
}
return 0;
}
static void davinci_mcasp_gpio_set(struct gpio_chip *chip, unsigned offset,
int value)
{
struct davinci_mcasp *mcasp = gpiochip_get_data(chip);
if (value)
mcasp_set_bits(mcasp, DAVINCI_MCASP_PDOUT_REG, BIT(offset));
else
mcasp_clr_bits(mcasp, DAVINCI_MCASP_PDOUT_REG, BIT(offset));
}
static int davinci_mcasp_gpio_direction_in(struct gpio_chip *chip,
unsigned offset)
{
struct davinci_mcasp *mcasp = gpiochip_get_data(chip);
u32 val;
val = mcasp_get_reg(mcasp, DAVINCI_MCASP_PFUNC_REG);
if (!(val & BIT(offset))) {
/* Set the direction to input */
mcasp_clr_bits(mcasp, DAVINCI_MCASP_PDIR_REG, BIT(offset));
/* Set the pin as GPIO pin */
mcasp_set_bits(mcasp, DAVINCI_MCASP_PFUNC_REG, BIT(offset));
}
return 0;
}
static int davinci_mcasp_gpio_get(struct gpio_chip *chip, unsigned offset)
{
struct davinci_mcasp *mcasp = gpiochip_get_data(chip);
u32 val;
val = mcasp_get_reg(mcasp, DAVINCI_MCASP_PDSET_REG);
if (val & BIT(offset))
return 1;
return 0;
}
static int davinci_mcasp_gpio_get_direction(struct gpio_chip *chip,
unsigned offset)
{
struct davinci_mcasp *mcasp = gpiochip_get_data(chip);
u32 val;
val = mcasp_get_reg(mcasp, DAVINCI_MCASP_PDIR_REG);
if (val & BIT(offset))
return 0;
return 1;
}
static const struct gpio_chip davinci_mcasp_template_chip = {
.owner = THIS_MODULE,
.request = davinci_mcasp_gpio_request,
.free = davinci_mcasp_gpio_free,
.direction_output = davinci_mcasp_gpio_direction_out,
.set = davinci_mcasp_gpio_set,
.direction_input = davinci_mcasp_gpio_direction_in,
.get = davinci_mcasp_gpio_get,
.get_direction = davinci_mcasp_gpio_get_direction,
.base = -1,
.ngpio = 32,
};
static int davinci_mcasp_init_gpiochip(struct davinci_mcasp *mcasp)
{
if (!of_property_read_bool(mcasp->dev->of_node, "gpio-controller"))
return 0;
mcasp->gpio_chip = davinci_mcasp_template_chip;
mcasp->gpio_chip.label = dev_name(mcasp->dev);
mcasp->gpio_chip.parent = mcasp->dev;
#ifdef CONFIG_OF_GPIO
mcasp->gpio_chip.of_node = mcasp->dev->of_node;
#endif
return devm_gpiochip_add_data(mcasp->dev, &mcasp->gpio_chip, mcasp);
}
#else /* CONFIG_GPIOLIB */
static inline int davinci_mcasp_init_gpiochip(struct davinci_mcasp *mcasp)
{
return 0;
}
#endif /* CONFIG_GPIOLIB */
static int davinci_mcasp_probe(struct platform_device *pdev)
{
struct snd_dmaengine_dai_dma_data *dma_data;
@ -2069,6 +2213,15 @@ static int davinci_mcasp_probe(struct platform_device *pdev)
mcasp_reparent_fck(pdev);
/* All PINS as McASP */
pm_runtime_get_sync(mcasp->dev);
mcasp_set_reg(mcasp, DAVINCI_MCASP_PFUNC_REG, 0x00000000);
pm_runtime_put(mcasp->dev);
ret = davinci_mcasp_init_gpiochip(mcasp);
if (ret)
goto err;
ret = devm_snd_soc_register_component(&pdev->dev,
&davinci_mcasp_component,
&davinci_mcasp_dai[pdata->op_mode], 1);