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Subject[PATCH 3/3] ASoC: ti: davinci-mcasp: Add support for GPIO mode of the pins
Date
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>
---
sound/soc/ti/davinci-mcasp.c | 159 ++++++++++++++++++++++++++++++++++-
1 file changed, 156 insertions(+), 3 deletions(-)

diff --git a/sound/soc/ti/davinci-mcasp.c b/sound/soc/ti/davinci-mcasp.c
index a6a470a76900..a3a67a8f0f54 100644
--- a/sound/soc/ti/davinci-mcasp.c
+++ b/sound/soc/ti/davinci-mcasp.c
@@ -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);
--
Peter
Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki

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