提交 7ef31e9c 编写于 作者: D David Brownell 提交者: Haavard Skinnemoen

avr32: improve NGW100 I2C/PMBus setup

Basic I2C initialization for the NGW100 board:

  - Provide empty i2c device table. Daughtercards may add devices,
    and the ATtiny24 could do stuff too.

  - Set up EXTINT(3) so the ATtiny24 can interrupt the AP7000.
Signed-off-by: NDavid Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: NHaavard Skinnemoen <haavard.skinnemoen@atmel.com>
上级 d86d314f
...@@ -9,6 +9,8 @@ ...@@ -9,6 +9,8 @@
*/ */
#include <linux/clk.h> #include <linux/clk.h>
#include <linux/etherdevice.h> #include <linux/etherdevice.h>
#include <linux/irq.h>
#include <linux/i2c.h>
#include <linux/i2c-gpio.h> #include <linux/i2c-gpio.h>
#include <linux/init.h> #include <linux/init.h>
#include <linux/linkage.h> #include <linux/linkage.h>
...@@ -147,6 +149,10 @@ static struct platform_device i2c_gpio_device = { ...@@ -147,6 +149,10 @@ static struct platform_device i2c_gpio_device = {
}, },
}; };
static struct i2c_board_info __initdata i2c_info[] = {
/* NOTE: original ATtiny24 firmware is at address 0x0b */
};
static int __init atngw100_init(void) static int __init atngw100_init(void)
{ {
unsigned i; unsigned i;
...@@ -172,12 +178,28 @@ static int __init atngw100_init(void) ...@@ -172,12 +178,28 @@ static int __init atngw100_init(void)
} }
platform_device_register(&ngw_gpio_leds); platform_device_register(&ngw_gpio_leds);
/* all these i2c/smbus pins should have external pullups for
* open-drain sharing among all I2C devices. SDA and SCL do;
* PB28/EXTINT3 doesn't; it should be SMBALERT# (for PMBus),
* but it's not available off-board.
*/
at32_select_periph(GPIO_PIN_PB(28), 0, AT32_GPIOF_PULLUP);
at32_select_gpio(i2c_gpio_data.sda_pin, at32_select_gpio(i2c_gpio_data.sda_pin,
AT32_GPIOF_MULTIDRV | AT32_GPIOF_OUTPUT | AT32_GPIOF_HIGH); AT32_GPIOF_MULTIDRV | AT32_GPIOF_OUTPUT | AT32_GPIOF_HIGH);
at32_select_gpio(i2c_gpio_data.scl_pin, at32_select_gpio(i2c_gpio_data.scl_pin,
AT32_GPIOF_MULTIDRV | AT32_GPIOF_OUTPUT | AT32_GPIOF_HIGH); AT32_GPIOF_MULTIDRV | AT32_GPIOF_OUTPUT | AT32_GPIOF_HIGH);
platform_device_register(&i2c_gpio_device); platform_device_register(&i2c_gpio_device);
i2c_register_board_info(0, i2c_info, ARRAY_SIZE(i2c_info));
return 0; return 0;
} }
postcore_initcall(atngw100_init); postcore_initcall(atngw100_init);
static int __init atngw100_arch_init(void)
{
/* set_irq_type() after the arch_initcall for EIC has run, and
* before the I2C subsystem could try using this IRQ.
*/
return set_irq_type(AT32_EXTINT(3), IRQ_TYPE_EDGE_FALLING);
}
arch_initcall(atngw100_arch_init);
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