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>

diff --git a/arch/arm/include/asm/arch-sunxi/gpio.h b/arch/arm/include/asm/arch-sunxi/gpio.h
index 6730879..32941cb 100644 (file)
--- 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 (file)
--- 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 (file)
--- 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);
+}

diff --git a/include/axp209.h b/include/axp209.h
index 21efce6..0436249 100644 (file)
--- 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);