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Unverified Commit 540f1ba7 authored by Peter Ujfalusi's avatar Peter Ujfalusi Committed by Mark Brown
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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: default avatarPeter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 4664b94c

sound/soc/ti/davinci-mcasp.c

+156 −3
Original line number Diff line number Diff line
@@ -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);