[PATCH] EDB93xx: Add support for CS4271 CODEC on EDB93xx boards

Alexander Sverdlin
2011-02-01T23:40:53Z

From: Alexander Sverdlin <subaparts@yandex.ru>

Add support for CS4271 SPI-connected CODEC on EDB93xx boards.
Major rework based on code provided by H Hartley Sweeten <hsweeten@visionengravers.com>.
Tested on EDB9302, others (EDB9301, EDB9302A, EDB9307A, EDB0315A) should work.

Signed-off-by: Alexander Sverdlin <subaparts@yandex.ru>
---
arch/arm/mach-ep93xx/edb93xx.c | 117 ++++++++++++++++++++++++++++++++++++++++
1 files changed, 117 insertions(+), 0 deletions(-)

diff --git a/arch/arm/mach-ep93xx/edb93xx.c b/arch/arm/mach-ep93xx/edb93xx.c
index 4b04316..f20be96 100644
--- a/arch/arm/mach-ep93xx/edb93xx.c
+++ b/arch/arm/mach-ep93xx/edb93xx.c
@@ -30,12 +30,22 @@
#include <linux/gpio.h>
#include <linux/i2c.h>
#include <linux/i2c-gpio.h>
+#include <linux/spi/spi.h>
+#include <linux/delay.h>
+#include <mach/ep93xx_spi.h>

#include <mach/hardware.h>

#include <asm/mach-types.h>
#include <asm/mach/arch.h>

+#include <sound/cs4271.h>
+
+#define edb93xx_has_audio() (machine_is_edb9301() || \
+ machine_is_edb9302() || \
+ machine_is_edb9302a() || \
+ machine_is_edb9307a() || \
+ machine_is_edb9315a())

static void __init edb93xx_register_flash(void)
{
@@ -93,6 +103,111 @@ static void __init edb93xx_register_i2c(void)

/*************************************************************************
+ * EDB93xx SPI peripheral handling
+ *************************************************************************/
+static int edb93xx_cs4271_hw_setup(struct spi_device *spi)
+{
+ int gpio_nreset;
+ int err;
+
+ if (machine_is_edb9301() || machine_is_edb9302()) {
+ gpio_nreset = EP93XX_GPIO_LINE_EGPIO1;
+ } else if (machine_is_edb9302a() || machine_is_edb9307a()) {
+ ep93xx_devcfg_set_bits(EP93XX_SYSCON_DEVCFG_HONIDE);
+ gpio_nreset = EP93XX_GPIO_LINE_DD2;
+ } else if (machine_is_edb9315a()) {
+ gpio_nreset = EP93XX_GPIO_LINE_EGPIO14;
+ } else {
+ return -EINVAL;
+ }
+
+ err = gpio_request(gpio_nreset, spi->modalias);
+ if (err)
+ return err;
+ err = gpio_request(EP93XX_GPIO_LINE_EGPIO6, spi->modalias);
+ if (err)
+ return err;
+
+ gpio_direction_output(EP93XX_GPIO_LINE_EGPIO6, 1);
+
+ /* Reset codec */
+ gpio_direction_output(gpio_nreset, 0);
+ udelay(1);
+ gpio_set_value(gpio_nreset, 1);
+ /* Give the codec time to wake up */
+ udelay(1);
+
+ return 0;
+}
+
+static void edb93xx_cs4271_hw_cleanup(struct spi_device *spi)
+{
+ int gpio_nreset;
+
+ if (machine_is_edb9301() || machine_is_edb9302())
+ gpio_nreset = EP93XX_GPIO_LINE_EGPIO1;
+ else if (machine_is_edb9302a() || machine_is_edb9307a())
+ gpio_nreset = EP93XX_GPIO_LINE_DD2;
+ else if (machine_is_edb9315a())
+ gpio_nreset = EP93XX_GPIO_LINE_EGPIO14;
+ else
+ return;
+
+ gpio_set_value(gpio_nreset, 0);
+ gpio_free(gpio_nreset);
+
+ gpio_set_value(EP93XX_GPIO_LINE_EGPIO6, 1);
+ gpio_free(EP93XX_GPIO_LINE_EGPIO6);
+}
+
+static void edb93xx_cs4271_hw_cs_control(struct spi_device *spi, int value)
+{
+ gpio_set_value(EP93XX_GPIO_LINE_EGPIO6, value);
+}
+
+static struct ep93xx_spi_chip_ops edb93xx_cs4271_hw = {
+ .setup = edb93xx_cs4271_hw_setup,
+ .cleanup = edb93xx_cs4271_hw_cleanup,
+ .cs_control = edb93xx_cs4271_hw_cs_control,
+};
+
+static struct spi_board_info edb93xx_spi_board_info[] __initdata = {
+ {
+ .modalias = "cs4271",
+ .controller_data = &edb93xx_cs4271_hw,
+ .max_speed_hz = 6000000,
+ .bus_num = 0,
+ .chip_select = 0,
+ .mode = SPI_MODE_3,
+ },
+};
+
+static struct ep93xx_spi_info edb93xx_spi_info = {
+ .num_chipselect = ARRAY_SIZE(edb93xx_spi_board_info),
+};
+
+static void __init edb93xx_register_spi(void)
+{
+ if (edb93xx_has_audio()) {
+ ep93xx_register_spi(&edb93xx_spi_info,
+ edb93xx_spi_board_info,
+ ARRAY_SIZE(edb93xx_spi_board_info));
+ }
+}
+
+
+/*************************************************************************
+ * EDB93xx I2S
+ *************************************************************************/
+static void __init edb93xx_register_i2s(void)
+{
+ if (edb93xx_has_audio()) {
+ ep93xx_register_i2s();
+ }
+}
+
+
+/*************************************************************************
* EDB93xx pwm
*************************************************************************/
static void __init edb93xx_register_pwm(void)
@@ -117,6 +232,8 @@ static void __init edb93xx_init_machine(void)
edb93xx_register_flash();
ep93xx_register_eth(&edb93xx_eth_data, 1);
edb93xx_register_i2c();
+ edb93xx_register_spi();
+ edb93xx_register_i2s();
edb93xx_register_pwm();
}