OMAP3: pandora: revise GPIO configuration

Update pandora's GPIO setup code with these changes:
- convert to gpiolib
- set up dual voltage GPIOs to match supply of 1.8V by clearing VMODE1
- add GPIO_IO_PWRDNZ configuration for DM3730 variation of pandora
  (required to enable GPIO 126, 127, and 129 I/O cells in DM3730)
- add wifi reset pulse as recommended by wifi chip's manufacturer
- drop configuration of GPIOs that u-boot doesn't need

Signed-off-by: Grazvydas Ignotas <notasas@gmail.com>

diff --git a/board/pandora/pandora.c b/board/pandora/pandora.c
index 5c77fad..3a62e9d 100644 (file)
--- a/board/pandora/pandora.c
+++ b/board/pandora/pandora.c
@@ -32,6 +32,7 @@
 #include <common.h>
 #include <twl4030.h>
 #include <asm/io.h>
+#include <asm/gpio.h>
 #include <asm/arch/mmc_host_def.h>
 #include <asm/arch/mux.h>
 #include <asm/arch/gpio.h>
@@ -45,6 +46,10 @@ DECLARE_GLOBAL_DATA_PTR;
 #define TWL4030_BB_CFG_BBSEL_3200MV    (3 << 2)
 #define TWL4030_BB_CFG_BBISEL_500UA    2
 
+#define CONTROL_WKUP_CTRL              0x48002a5c
+#define GPIO_IO_PWRDNZ                 (1 << 6)
+#define PBIASLITEVMODE1                        (1 << 8)
+
 /*
  * Routine: board_init
  * Description: Early hardware init.
@@ -60,29 +65,52 @@ int board_init(void)
        return 0;
 }
 
+static void set_output_gpio(unsigned int gpio, int value)
+{
+       int ret;
+
+       ret = gpio_request(gpio, "");
+       if (ret != 0) {
+               printf("could not request GPIO %u\n", gpio);
+               return;
+       }
+       ret = gpio_direction_output(gpio, value);
+       if (ret != 0)
+               printf("could not set GPIO %u to %d\n", gpio, value);
+}
+
 /*
  * Routine: misc_init_r
  * Description: Configure board specific parts
  */
 int misc_init_r(void)
 {
-       struct gpio *gpio1_base = (struct gpio *)OMAP34XX_GPIO1_BASE;
-       struct gpio *gpio4_base = (struct gpio *)OMAP34XX_GPIO4_BASE;
-       struct gpio *gpio5_base = (struct gpio *)OMAP34XX_GPIO5_BASE;
-       struct gpio *gpio6_base = (struct gpio *)OMAP34XX_GPIO6_BASE;
+       t2_t *t2_base = (t2_t *)T2_BASE;
+       u32 pbias_lite;
 
        twl4030_led_init(TWL4030_LED_LEDEN_LEDBON);
 
-       /* Configure GPIOs to output */
-       writel(~(GPIO14 | GPIO15 | GPIO16 | GPIO23), &gpio1_base->oe);
-       writel(~GPIO22, &gpio4_base->oe);       /* 118 */
-       writel(~(GPIO0 | GPIO1 | GPIO28 | GPIO29 | GPIO30 | GPIO31),
-               &gpio5_base->oe);       /* 128, 129, 156-159 */
-       writel(~GPIO4, &gpio6_base->oe);        /* 164 */
+       /* set up dual-voltage GPIOs to 1.8V */
+       pbias_lite = readl(&t2_base->pbias_lite);
+       pbias_lite &= ~PBIASLITEVMODE1;
+       pbias_lite |= PBIASLITEPWRDNZ1;
+       writel(pbias_lite, &t2_base->pbias_lite);
+       if (get_cpu_family() == CPU_OMAP36XX)
+               writel(readl(CONTROL_WKUP_CTRL) | GPIO_IO_PWRDNZ,
+                       CONTROL_WKUP_CTRL);
+
+       /* make sure audio and BT chips are in powerdown state */
+       set_output_gpio(14, 0);
+       set_output_gpio(15, 0);
+       set_output_gpio(118, 0);
+
+       /* enable USB supply */
+       set_output_gpio(164, 1);
 
-       /* Set GPIOs */
-       writel(GPIO28, &gpio5_base->setdataout);
-       writel(GPIO4, &gpio6_base->setdataout);
+       /* wifi needs a short pulse to enter powersave state */
+       set_output_gpio(23, 1);
+       udelay(5000);
+       gpio_direction_output(23, 0);
 
        /* Enable battery backup capacitor (3.2V, 0.5mA charge current) */
        twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER,