[ARM] 4650/1: AT91: New-style init of I2C, support for i2c-gpio

[linux-2.6-omap-h63xx.git] / arch / arm / mach-at91 / at91sam9261_devices.c

diff --git a/arch/arm/mach-at91/at91sam9261_devices.c b/arch/arm/mach-at91/at91sam9261_devices.c
index 3576595b4941b7ecefcf75b0ab1ec0128f1bc261..64979a9023c2cb4e0a674cbb8cc9303ae0066074 100644 (file)
--- a/arch/arm/mach-at91/at91sam9261_devices.c
+++ b/arch/arm/mach-at91/at91sam9261_devices.c
@@ -14,7 +14,9 @@
 #include <asm/mach/map.h>
 
 #include <linux/platform_device.h>
+#include <linux/i2c-gpio.h>
 
+#include <linux/fb.h>
 #include <video/atmel_lcdc.h>
 
 #include <asm/arch/board.h>
@@ -275,7 +277,40 @@ void __init at91_add_device_nand(struct at91_nand_data *data) {}
  *  TWI (i2c)
  * -------------------------------------------------------------------- */
 
-#if defined(CONFIG_I2C_AT91) || defined(CONFIG_I2C_AT91_MODULE)
+/*
+ * Prefer the GPIO code since the TWI controller isn't robust
+ * (gets overruns and underruns under load) and can only issue
+ * repeated STARTs in one scenario (the driver doesn't yet handle them).
+ */
+#if defined(CONFIG_I2C_GPIO) || defined(CONFIG_I2C_GPIO_MODULE)
+
+static struct i2c_gpio_platform_data pdata = {
+       .sda_pin                = AT91_PIN_PA7,
+       .sda_is_open_drain      = 1,
+       .scl_pin                = AT91_PIN_PA8,
+       .scl_is_open_drain      = 1,
+       .udelay                 = 2,            /* ~100 kHz */
+};
+
+static struct platform_device at91sam9261_twi_device = {
+       .name                   = "i2c-gpio",
+       .id                     = -1,
+       .dev.platform_data      = &pdata,
+};
+
+void __init at91_add_device_i2c(struct i2c_board_info *devices, int nr_devices)
+{
+       at91_set_GPIO_periph(AT91_PIN_PA7, 1);          /* TWD (SDA) */
+       at91_set_multi_drive(AT91_PIN_PA7, 1);
+
+       at91_set_GPIO_periph(AT91_PIN_PA8, 1);          /* TWCK (SCL) */
+       at91_set_multi_drive(AT91_PIN_PA8, 1);
+
+       i2c_register_board_info(0, devices, nr_devices);
+       platform_device_register(&at91sam9261_twi_device);
+}
+
+#elif defined(CONFIG_I2C_AT91) || defined(CONFIG_I2C_AT91_MODULE)
 
 static struct resource twi_resources[] = {
        [0] = {
@@ -297,7 +332,7 @@ static struct platform_device at91sam9261_twi_device = {
        .num_resources  = ARRAY_SIZE(twi_resources),
 };
 
-void __init at91_add_device_i2c(void)
+void __init at91_add_device_i2c(struct i2c_board_info *devices, int nr_devices)
 {
        /* pins used for TWI interface */
        at91_set_A_periph(AT91_PIN_PA7, 0);             /* TWD */
@@ -306,10 +341,11 @@ void __init at91_add_device_i2c(void)
        at91_set_A_periph(AT91_PIN_PA8, 0);             /* TWCK */
        at91_set_multi_drive(AT91_PIN_PA8, 1);
 
+       i2c_register_board_info(0, devices, nr_devices);
        platform_device_register(&at91sam9261_twi_device);
 }
 #else
-void __init at91_add_device_i2c(void) {}
+void __init at91_add_device_i2c(struct i2c_board_info *devices, int nr_devices) {}
 #endif