diff options
Diffstat (limited to 'drivers/st/gpio')
| -rw-r--r-- | drivers/st/gpio/stm32_gpio.c | 323 |
1 files changed, 323 insertions, 0 deletions
diff --git a/drivers/st/gpio/stm32_gpio.c b/drivers/st/gpio/stm32_gpio.c new file mode 100644 index 0000000..708989f --- /dev/null +++ b/drivers/st/gpio/stm32_gpio.c @@ -0,0 +1,323 @@ +/* + * Copyright (c) 2016-2022, STMicroelectronics - All Rights Reserved + * + * SPDX-License-Identifier: BSD-3-Clause + */ + +#include <assert.h> +#include <errno.h> +#include <stdbool.h> + +#include <common/bl_common.h> +#include <common/debug.h> +#include <drivers/clk.h> +#include <drivers/st/stm32_gpio.h> +#include <drivers/st/stm32mp_clkfunc.h> +#include <lib/mmio.h> +#include <lib/utils_def.h> +#include <libfdt.h> + +#include <platform_def.h> + +#define DT_GPIO_BANK_SHIFT 12 +#define DT_GPIO_BANK_MASK GENMASK(16, 12) +#define DT_GPIO_PIN_SHIFT 8 +#define DT_GPIO_PIN_MASK GENMASK(11, 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 od, + uint32_t alternate, uint8_t status); + +/******************************************************************************* + * This function gets GPIO bank node in DT. + * Returns node offset if status is okay in DT, else return 0 + ******************************************************************************/ +static int ckeck_gpio_bank(void *fdt, uint32_t bank, int pinctrl_node) +{ + int pinctrl_subnode; + uint32_t bank_offset = stm32_get_gpio_bank_offset(bank); + + fdt_for_each_subnode(pinctrl_subnode, fdt, pinctrl_node) { + const fdt32_t *cuint; + + if (fdt_getprop(fdt, pinctrl_subnode, + "gpio-controller", NULL) == NULL) { + continue; + } + + cuint = fdt_getprop(fdt, pinctrl_subnode, "reg", NULL); + if (cuint == NULL) { + continue; + } + + if ((fdt32_to_cpu(*cuint) == bank_offset) && + (fdt_get_status(pinctrl_subnode) != DT_DISABLED)) { + return pinctrl_subnode; + } + } + + return 0; +} + +/******************************************************************************* + * This function gets the pin settings from DT information. + * When analyze and parsing is done, set the GPIO registers. + * Returns 0 on success and a negative FDT error code on failure. + ******************************************************************************/ +static int dt_set_gpio_config(void *fdt, int node, uint8_t status) +{ + const fdt32_t *cuint, *slewrate; + int len; + int pinctrl_node; + uint32_t i; + uint32_t speed = GPIO_SPEED_LOW; + uint32_t pull = GPIO_NO_PULL; + + cuint = fdt_getprop(fdt, node, "pinmux", &len); + if (cuint == NULL) { + return -FDT_ERR_NOTFOUND; + } + + pinctrl_node = fdt_parent_offset(fdt, fdt_parent_offset(fdt, node)); + if (pinctrl_node < 0) { + return -FDT_ERR_NOTFOUND; + } + + slewrate = fdt_getprop(fdt, node, "slew-rate", NULL); + if (slewrate != NULL) { + speed = fdt32_to_cpu(*slewrate); + } + + if (fdt_getprop(fdt, node, "bias-pull-up", NULL) != NULL) { + pull = GPIO_PULL_UP; + } else if (fdt_getprop(fdt, node, "bias-pull-down", NULL) != NULL) { + pull = GPIO_PULL_DOWN; + } else { + VERBOSE("No bias configured in node %d\n", node); + } + + for (i = 0U; i < ((uint32_t)len / sizeof(uint32_t)); i++) { + uint32_t pincfg; + uint32_t bank; + uint32_t pin; + uint32_t mode; + uint32_t alternate = GPIO_ALTERNATE_(0); + uint32_t type; + uint32_t od = GPIO_OD_OUTPUT_LOW; + int bank_node; + int clk; + + pincfg = fdt32_to_cpu(*cuint); + cuint++; + + bank = (pincfg & DT_GPIO_BANK_MASK) >> DT_GPIO_BANK_SHIFT; + + pin = (pincfg & DT_GPIO_PIN_MASK) >> DT_GPIO_PIN_SHIFT; + + mode = pincfg & DT_GPIO_MODE_MASK; + + switch (mode) { + case 0: + mode = GPIO_MODE_INPUT; + break; + case 1 ... 16: + alternate = mode - 1U; + mode = GPIO_MODE_ALTERNATE; + break; + case 17: + mode = GPIO_MODE_ANALOG; + break; + default: + mode = GPIO_MODE_OUTPUT; + break; + } + + if (fdt_getprop(fdt, node, "drive-open-drain", NULL) != NULL) { + type = GPIO_TYPE_OPEN_DRAIN; + } else { + 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"); + panic(); + } + + clk = fdt_get_clock_id(bank_node); + if (clk < 0) { + return -FDT_ERR_NOTFOUND; + } + + /* 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, od, alternate, status); + } + + return 0; +} + +/******************************************************************************* + * This function gets the pin settings from DT information. + * When analyze and parsing is done, set the GPIO registers. + * Returns 0 on success and a negative FDT/ERRNO error code on failure. + ******************************************************************************/ +int dt_set_pinctrl_config(int node) +{ + const fdt32_t *cuint; + int lenp; + uint32_t i; + uint8_t status; + void *fdt; + + if (fdt_get_address(&fdt) == 0) { + return -FDT_ERR_NOTFOUND; + } + + status = fdt_get_status(node); + if (status == DT_DISABLED) { + return -FDT_ERR_NOTFOUND; + } + + cuint = fdt_getprop(fdt, node, "pinctrl-0", &lenp); + if (cuint == NULL) { + return -FDT_ERR_NOTFOUND; + } + + for (i = 0; i < ((uint32_t)lenp / 4U); i++) { + int p_node, p_subnode; + + p_node = fdt_node_offset_by_phandle(fdt, fdt32_to_cpu(*cuint)); + if (p_node < 0) { + return -FDT_ERR_NOTFOUND; + } + + fdt_for_each_subnode(p_subnode, fdt, p_node) { + int ret = dt_set_gpio_config(fdt, p_subnode, status); + + if (ret < 0) { + return ret; + } + } + + cuint++; + } + + return 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 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); + + assert(pin <= GPIO_PIN_MAX); + + clk_enable(clock); + + mmio_clrsetbits_32(base + GPIO_MODE_OFFSET, + (uint32_t)GPIO_MODE_MASK << (pin << 1), + mode << (pin << 1)); + + mmio_clrsetbits_32(base + GPIO_TYPE_OFFSET, + (uint32_t)GPIO_TYPE_MASK << pin, + type << pin); + + mmio_clrsetbits_32(base + GPIO_SPEED_OFFSET, + (uint32_t)GPIO_SPEED_MASK << (pin << 1), + speed << (pin << 1)); + + mmio_clrsetbits_32(base + GPIO_PUPD_OFFSET, + (uint32_t)GPIO_PULL_MASK << (pin << 1), + pull << (pin << 1)); + + if (pin < GPIO_ALT_LOWER_LIMIT) { + mmio_clrsetbits_32(base + GPIO_AFRL_OFFSET, + (uint32_t)GPIO_ALTERNATE_MASK << (pin << 2), + alternate << (pin << 2)); + } else { + size_t shift = (pin - GPIO_ALT_LOWER_LIMIT) << 2; + + mmio_clrsetbits_32(base + GPIO_AFRH_OFFSET, + (uint32_t)GPIO_ALTERNATE_MASK << shift, + 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, + mmio_read_32(base + GPIO_TYPE_OFFSET)); + VERBOSE("GPIO %u speed set to 0x%x\n", bank, + mmio_read_32(base + GPIO_SPEED_OFFSET)); + VERBOSE("GPIO %u mode pull to 0x%x\n", bank, + mmio_read_32(base + GPIO_PUPD_OFFSET)); + VERBOSE("GPIO %u mode alternate low to 0x%x\n", bank, + 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); + + if (status == DT_SECURE) { + stm32mp_register_secure_gpio(bank, pin); +#if !IMAGE_BL2 + set_gpio_secure_cfg(bank, pin, true); +#endif + + } else { + stm32mp_register_non_secure_gpio(bank, pin); +#if !IMAGE_BL2 + set_gpio_secure_cfg(bank, pin, false); +#endif + } +} + +void set_gpio_secure_cfg(uint32_t bank, uint32_t pin, bool secure) +{ + uintptr_t base = stm32_get_gpio_bank_base(bank); + unsigned long clock = stm32_get_gpio_bank_clock(bank); + + assert(pin <= GPIO_PIN_MAX); + + clk_enable(clock); + + if (secure) { + mmio_setbits_32(base + GPIO_SECR_OFFSET, BIT(pin)); + } else { + mmio_clrbits_32(base + GPIO_SECR_OFFSET, BIT(pin)); + } + + clk_disable(clock); +} + +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_OD_OUTPUT_LOW, + GPIO_ALTERNATE_(0), DT_DISABLED); + set_gpio_secure_cfg(bank, pin, stm32_gpio_is_secure_at_reset(bank)); +} |