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authorHans de Goede <hdegoede@redhat.com>2014-12-24 19:34:38 +0100
committerHans de Goede <hdegoede@redhat.com>2015-01-14 14:56:38 +0100
commit6c727e09a022fcc0701eef58c4a5aedae5d9a6ac (patch)
treeb03dcd3a57abfd69fa7747c24ac91ff706cf7d33 /drivers
parentd27f7d14eaa1299b93c1e5efb691ddf0884885fa (diff)
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sunxi: gpio: Add support for gpio pins on the AXP209 pmic
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> Acked-by: Ian Campbell <ijc@hellion.org.uk>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/gpio/sunxi_gpio.c30
-rw-r--r--drivers/power/axp209.c72
2 files changed, 102 insertions, 0 deletions
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..3b1a6a7 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 +32,15 @@ enum axp209_reg {
#define AXP209_POWEROFF (1 << 7)
+#define AXP209_GPIO_OUTPUT_LOW 0x00 /* Drive pin low */
+#define AXP209_GPIO_OUTPUT_HIGH 0x01 /* Drive pin high */
+#define AXP209_GPIO_INPUT 0x02 /* Float pin */
+
+/* GPIO3 is different from the others */
+#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 +179,61 @@ 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);
+}