[U-Boot] [PATCH 03/17] sunxi: gpio: Add support for gpio pins on the AXP209 pmic

Hans de Goede
2014-12-24T19:06:15Z

Some boards use GPIO-s on the pmic, one example of this is the A13-OLinuXino
board, which uses gpio0 of the axp209 for the lcd-power signal.

This commit adds support for gpio pins on the AXP209 pmic, the sunxi_gpio.c
changes are universal, adding gpio support for the other AXP pmics (when
necessary) should be a matter of adding the necessary axp_gpio_foo functions
to their resp. drivers, and add "#define AXP_GPIO" to their header file.

Note this commit only adds support for the non device-model version of the
gpio code, patches for adding support to the device-model version are very
welcome.

The string representation for these gpio-s is AXP0-#, the 0 in the AXP0 prefix
is there in case we need to support gpio-s on more then 1 pmic in the future.
At least A80 boards have 2 pmics, and we may end up needing to support gpio-s
on both.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
arch/arm/include/asm/arch-sunxi/gpio.h | 3 ++
drivers/gpio/sunxi_gpio.c | 30 ++++++++++++++
drivers/power/axp209.c | 74 ++++++++++++++++++++++++++++++++++
include/axp209.h | 7 ++++
4 files changed, 114 insertions(+)

diff --git a/arch/arm/include/asm/arch-sunxi/gpio.h b/arch/arm/include/asm/arch-sunxi/gpio.h
index 6730879..32941cb 100644
--- a/arch/arm/include/asm/arch-sunxi/gpio.h
+++ b/arch/arm/include/asm/arch-sunxi/gpio.h
@@ -114,6 +114,7 @@ enum sunxi_gpio_number {
SUNXI_GPIO_I_START = SUNXI_GPIO_NEXT(SUNXI_GPIO_H),
SUNXI_GPIO_L_START = 352,
SUNXI_GPIO_M_START = SUNXI_GPIO_NEXT(SUNXI_GPIO_L),
+ SUNXI_GPIO_AXP0_START = 1024,
};

/* SUNXI GPIO number definitions */
@@ -129,6 +130,8 @@ enum sunxi_gpio_number {
#define SUNXI_GPL(_nr) (SUNXI_GPIO_L_START + (_nr))
#define SUNXI_GPM(_nr) (SUNXI_GPIO_M_START + (_nr))

+#define SUNXI_GPAXP0(_nr) (SUNXI_GPIO_AXP0_START + (_nr))
+
/* GPIO pin function config */
#define SUNXI_GPIO_INPUT 0
#define SUNXI_GPIO_OUTPUT 1
diff --git a/drivers/gpio/sunxi_gpio.c b/drivers/gpio/sunxi_gpio.c
index 2fa50f9..6296092 100644
--- a/drivers/gpio/sunxi_gpio.c
+++ b/drivers/gpio/sunxi_gpio.c
@@ -18,6 +18,9 @@
#include <asm/io.h>
#include <asm/gpio.h>
#include <dm/device-internal.h>
+#ifdef CONFIG_AXP209_POWER
+#include <axp209.h>
+#endif

DECLARE_GLOBAL_DATA_PTR;

@@ -73,6 +76,10 @@ int gpio_free(unsigned gpio)

int gpio_direction_input(unsigned gpio)
{
+#ifdef AXP_GPIO
+ if (gpio >= SUNXI_GPIO_AXP0_START)
+ return axp_gpio_direction_input(gpio - SUNXI_GPIO_AXP0_START);
+#endif
sunxi_gpio_set_cfgpin(gpio, SUNXI_GPIO_INPUT);

return 0;
@@ -80,6 +87,11 @@ int gpio_direction_input(unsigned gpio)

int gpio_direction_output(unsigned gpio, int value)
{
+#ifdef AXP_GPIO
+ if (gpio >= SUNXI_GPIO_AXP0_START)
+ return axp_gpio_direction_output(gpio - SUNXI_GPIO_AXP0_START,
+ value);
+#endif
sunxi_gpio_set_cfgpin(gpio, SUNXI_GPIO_OUTPUT);

return sunxi_gpio_output(gpio, value);
@@ -87,11 +99,19 @@ int gpio_direction_output(unsigned gpio, int value)

int gpio_get_value(unsigned gpio)
{
+#ifdef AXP_GPIO
+ if (gpio >= SUNXI_GPIO_AXP0_START)
+ return axp_gpio_get_value(gpio - SUNXI_GPIO_AXP0_START);
+#endif
return sunxi_gpio_input(gpio);
}

int gpio_set_value(unsigned gpio, int value)
{
+#ifdef AXP_GPIO
+ if (gpio >= SUNXI_GPIO_AXP0_START)
+ return axp_gpio_set_value(gpio - SUNXI_GPIO_AXP0_START, value);
+#endif
return sunxi_gpio_output(gpio, value);
}

@@ -101,6 +121,16 @@ int sunxi_name_to_gpio(const char *name)
int groupsize = 9 * 32;
long pin;
char *eptr;
+
+#ifdef AXP_GPIO
+ if (strncasecmp(name, "AXP0-", 5) == 0) {
+ name += 5;
+ pin = simple_strtol(name, &eptr, 10);
+ if (!*name || *eptr)
+ return -1;
+ return SUNXI_GPIO_AXP0_START + pin;
+ }
+#endif
if (*name == 'P' || *name == 'p')
name++;
if (*name >= 'A') {
diff --git a/drivers/power/axp209.c b/drivers/power/axp209.c
index 9798e5b..397963e 100644
--- a/drivers/power/axp209.c
+++ b/drivers/power/axp209.c
@@ -18,6 +18,11 @@ enum axp209_reg {
AXP209_LDO3_VOLTAGE = 0x29,
AXP209_IRQ_STATUS5 = 0x4c,
AXP209_SHUTDOWN = 0x32,
+ AXP209_GPIO0_CTRL = 0x90,
+ AXP209_GPIO1_CTRL = 0x92,
+ AXP209_GPIO2_CTRL = 0x93,
+ AXP209_GPIO_STATE = 0x94,
+ AXP209_GPIO3_CTRL = 0x95,
};

#define AXP209_POWER_STATUS_ON_BY_DC (1 << 0)
@@ -27,6 +32,17 @@ enum axp209_reg {

#define AXP209_POWEROFF (1 << 7)

+#define AXP209_GPIO_OUTPUT_LOW 0x00
+#define AXP209_GPIO_OUTPUT_HIGH 0x01
+#define AXP209_GPIO_INPUT 0x02
+
+#define AXP209_GPIO_OUTPUT_LOW 0x00
+#define AXP209_GPIO_OUTPUT_HIGH 0x01
+
+#define AXP209_GPIO3_OUTPUT_LOW 0x00 /* Drive pin low, Output mode */
+#define AXP209_GPIO3_OUTPUT_HIGH 0x02 /* Float pin, Output mode */
+#define AXP209_GPIO3_INPUT 0x06 /* Float pin, Input mode */
+
static int axp209_write(enum axp209_reg reg, u8 val)
{
return i2c_write(0x34, reg, 1, &val, 1);
@@ -165,3 +181,61 @@ int axp209_power_button(void)

return v & AXP209_IRQ5_PEK_DOWN;
}
+
+static u8 axp209_get_gpio_ctrl_reg(unsigned int pin)
+{
+ switch (pin) {
+ case 0: return AXP209_GPIO0_CTRL;
+ case 1: return AXP209_GPIO1_CTRL;
+ case 2: return AXP209_GPIO2_CTRL;
+ case 3: return AXP209_GPIO3_CTRL;
+ }
+ return 0;
+}
+
+int axp_gpio_direction_input(unsigned int pin)
+{
+ u8 reg = axp209_get_gpio_ctrl_reg(pin);
+ /* GPIO3 is "special" */
+ u8 val = (pin == 3) ? AXP209_GPIO3_INPUT : AXP209_GPIO_INPUT;
+
+ return axp209_write(reg, val);
+}
+
+int axp_gpio_direction_output(unsigned int pin, unsigned int val)
+{
+ u8 reg = axp209_get_gpio_ctrl_reg(pin);
+
+ if (val) {
+ val = (pin == 3) ? AXP209_GPIO3_OUTPUT_HIGH :
+ AXP209_GPIO_OUTPUT_HIGH;
+ } else {
+ val = (pin == 3) ? AXP209_GPIO3_OUTPUT_LOW :
+ AXP209_GPIO_OUTPUT_LOW;
+ }
+
+ return axp209_write(reg, val);
+}
+
+int axp_gpio_get_value(unsigned int pin)
+{
+ u8 val, mask;
+ int rc;
+
+ if (pin == 3) {
+ rc = axp209_read(AXP209_GPIO3_CTRL, &val);
+ mask = 1;
+ } else {
+ rc = axp209_read(AXP209_GPIO_STATE, &val);
+ mask = 1 << (pin + 4);
+ }
+ if (rc)
+ return rc;
+
+ return (val & mask) ? 1 : 0;
+}
+
+int axp_gpio_set_value(unsigned int pin, unsigned int val)
+{
+ return axp_gpio_direction_output(pin, val);
+}
diff --git a/include/axp209.h b/include/axp209.h
index 21efce6..0436249 100644
--- a/include/axp209.h
+++ b/include/axp209.h
@@ -4,6 +4,8 @@
* SPDX-License-Identifier: GPL-2.0+
*/

+#define AXP_GPIO
+
extern int axp209_set_dcdc2(int mvolt);
extern int axp209_set_dcdc3(int mvolt);
extern int axp209_set_ldo2(int mvolt);
@@ -12,3 +14,8 @@ extern int axp209_set_ldo4(int mvolt);
extern int axp209_init(void);
extern int axp209_poweron_by_dc(void);
extern int axp209_power_button(void);
+
+extern int axp_gpio_direction_input(unsigned int pin);
+extern int axp_gpio_direction_output(unsigned int pin, unsigned int val);
+extern int axp_gpio_get_value(unsigned int pin);
+extern int axp_gpio_set_value(unsigned int pin, unsigned int val);
--
2.1.0