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sunxi: gpio: Add support for gpio pins on the AXP209 pmic

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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>
This commit is contained in:
Hans de Goede 2014-12-24 19:34:38 +01:00
parent d27f7d14ea
commit 6c727e09a0
4 changed files with 112 additions and 0 deletions
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3
arch/arm/include/asm/arch-sunxi/gpio.h
View file

@ -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

30
drivers/gpio/sunxi_gpio.c
View file

@ -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') {

72
drivers/power/axp209.c
View file

@ -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);
}

7
include/axp209.h
View file

@ -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);