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feat(st-gpio): allow to set a gpio in output mode

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Allow to set a gpio in output mode from the device tree.

Signed-off-by: Fabien Dessenne <fabien.dessenne@foss.st.com>
Change-Id: Ic483324bc5fe916a60df05f74706bd1da4d08aa5
This commit is contained in:
Fabien Dessenne 2021-09-21 14:18:34 +02:00 • committed by Yann Gautier
parent 417196faef
commit 53584e1d5b
2 changed files with 33 additions and 6 deletions
drivers/st/gpio
stm32_gpio.c
include/drivers/st
stm32_gpio.h

34
drivers/st/gpio/stm32_gpio.c
View file

@ -26,8 +26,8 @@
#define DT_GPIO_MODE_MASK GENMASK(7, 0)
static void set_gpio(uint32_t bank, uint32_t pin, uint32_t mode, uint32_t type,
uint32_t speed, uint32_t pull, uint32_t alternate,
uint8_t status);
uint32_t speed, uint32_t pull, uint32_t od,
uint32_t alternate, uint8_t status);
/*******************************************************************************
* This function gets GPIO bank node in DT.
@ -104,6 +104,7 @@ static int dt_set_gpio_config(void *fdt, int node, uint8_t status)
uint32_t mode;
uint32_t alternate = GPIO_ALTERNATE_(0);
uint32_t type;
uint32_t od = GPIO_OD_OUTPUT_LOW;
int bank_node;
int clk;
@ -138,6 +139,20 @@ static int dt_set_gpio_config(void *fdt, int node, uint8_t status)
type = GPIO_TYPE_PUSH_PULL;
}
if (fdt_getprop(fdt, node, "output-high", NULL) != NULL) {
if (mode == GPIO_MODE_INPUT) {
mode = GPIO_MODE_OUTPUT;
od = GPIO_OD_OUTPUT_HIGH;
}
}
if (fdt_getprop(fdt, node, "output-low", NULL) != NULL) {
if (mode == GPIO_MODE_INPUT) {
mode = GPIO_MODE_OUTPUT;
od = GPIO_OD_OUTPUT_LOW;
}
}
bank_node = ckeck_gpio_bank(fdt, bank, pinctrl_node);
if (bank_node == 0) {
ERROR("PINCTRL inconsistent in DT\n");
@ -152,7 +167,7 @@ static int dt_set_gpio_config(void *fdt, int node, uint8_t status)
/* Platform knows the clock: assert it is okay */
assert((unsigned long)clk == stm32_get_gpio_bank_clock(bank));
set_gpio(bank, pin, mode, type, speed, pull, alternate, status);
set_gpio(bank, pin, mode, type, speed, pull, od, alternate, status);
}
return 0;
@ -208,8 +223,8 @@ int dt_set_pinctrl_config(int node)
}
static void set_gpio(uint32_t bank, uint32_t pin, uint32_t mode, uint32_t type,
uint32_t speed, uint32_t pull, uint32_t alternate,
uint8_t status)
uint32_t speed, uint32_t pull, uint32_t od,
uint32_t alternate, uint8_t status)
{
uintptr_t base = stm32_get_gpio_bank_base(bank);
unsigned long clock = stm32_get_gpio_bank_clock(bank);
@ -246,6 +261,10 @@ static void set_gpio(uint32_t bank, uint32_t pin, uint32_t mode, uint32_t type,
alternate << shift);
}
mmio_clrsetbits_32(base + GPIO_OD_OFFSET,
(uint32_t)GPIO_OD_MASK << pin,
od << pin);
VERBOSE("GPIO %u mode set to 0x%x\n", bank,
mmio_read_32(base + GPIO_MODE_OFFSET));
VERBOSE("GPIO %u type set to 0x%x\n", bank,
@ -258,6 +277,8 @@ static void set_gpio(uint32_t bank, uint32_t pin, uint32_t mode, uint32_t type,
mmio_read_32(base + GPIO_AFRL_OFFSET));
VERBOSE("GPIO %u mode alternate high to 0x%x\n", bank,
mmio_read_32(base + GPIO_AFRH_OFFSET));
VERBOSE("GPIO %u output data set to 0x%x\n", bank,
mmio_read_32(base + GPIO_OD_OFFSET));
clk_disable(clock);
@ -292,6 +313,7 @@ void set_gpio_secure_cfg(uint32_t bank, uint32_t pin, bool secure)
void set_gpio_reset_cfg(uint32_t bank, uint32_t pin)
{
set_gpio(bank, pin, GPIO_MODE_ANALOG, GPIO_TYPE_PUSH_PULL,
GPIO_SPEED_LOW, GPIO_NO_PULL, GPIO_ALTERNATE_(0), DT_DISABLED);
GPIO_SPEED_LOW, GPIO_NO_PULL, GPIO_OD_OUTPUT_LOW,
GPIO_ALTERNATE_(0), DT_DISABLED);
set_gpio_secure_cfg(bank, pin, stm32_gpio_is_secure_at_reset(bank));
}

5
include/drivers/st/stm32_gpio.h
View file

@ -13,6 +13,7 @@
#define GPIO_TYPE_OFFSET U(0x04)
#define GPIO_SPEED_OFFSET U(0x08)
#define GPIO_PUPD_OFFSET U(0x0C)
#define GPIO_OD_OFFSET U(0x14)
#define GPIO_BSRR_OFFSET U(0x18)
#define GPIO_AFRL_OFFSET U(0x20)
#define GPIO_AFRH_OFFSET U(0x24)
@ -47,6 +48,10 @@
#define GPIO_PULL_DOWN U(0x02)
#define GPIO_PULL_MASK U(0x03)
#define GPIO_OD_OUTPUT_LOW U(0x00)
#define GPIO_OD_OUTPUT_HIGH U(0x01)
#define GPIO_OD_MASK U(0x01)
#ifndef __ASSEMBLER__
#include <stdint.h>