blob: 51276f489a6d6c6ff690ee214cbb6788fe2b3e30 [file] [log] [blame]
/*
* Copyright (c) 2016-2021, STMicroelectronics - All Rights Reserved
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <assert.h>
#include <errno.h>
#include <stdbool.h>
#include <libfdt.h>
#include <platform_def.h>
#include <common/bl_common.h>
#include <common/debug.h>
#include <drivers/st/stm32_gpio.h>
#include <drivers/st/stm32mp_clkfunc.h>
#include <lib/mmio.h>
#include <lib/utils_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)
/*******************************************************************************
* 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);
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) {
mode |= GPIO_OPEN_DRAIN;
}
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, speed, pull, 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 = 0;
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;
}
void set_gpio(uint32_t bank, uint32_t pin, uint32_t mode, uint32_t speed,
uint32_t pull, 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);
stm32mp_clk_enable(clock);
mmio_clrbits_32(base + GPIO_MODE_OFFSET,
((uint32_t)GPIO_MODE_MASK << (pin << 1)));
mmio_setbits_32(base + GPIO_MODE_OFFSET,
(mode & ~GPIO_OPEN_DRAIN) << (pin << 1));
if ((mode & GPIO_OPEN_DRAIN) != 0U) {
mmio_setbits_32(base + GPIO_TYPE_OFFSET, BIT(pin));
} else {
mmio_clrbits_32(base + GPIO_TYPE_OFFSET, BIT(pin));
}
mmio_clrbits_32(base + GPIO_SPEED_OFFSET,
((uint32_t)GPIO_SPEED_MASK << (pin << 1)));
mmio_setbits_32(base + GPIO_SPEED_OFFSET, speed << (pin << 1));
mmio_clrbits_32(base + GPIO_PUPD_OFFSET,
((uint32_t)GPIO_PULL_MASK << (pin << 1)));
mmio_setbits_32(base + GPIO_PUPD_OFFSET, pull << (pin << 1));
if (pin < GPIO_ALT_LOWER_LIMIT) {
mmio_clrbits_32(base + GPIO_AFRL_OFFSET,
((uint32_t)GPIO_ALTERNATE_MASK << (pin << 2)));
mmio_setbits_32(base + GPIO_AFRL_OFFSET,
alternate << (pin << 2));
} else {
mmio_clrbits_32(base + GPIO_AFRH_OFFSET,
((uint32_t)GPIO_ALTERNATE_MASK <<
((pin - GPIO_ALT_LOWER_LIMIT) << 2)));
mmio_setbits_32(base + GPIO_AFRH_OFFSET,
alternate << ((pin - GPIO_ALT_LOWER_LIMIT) <<
2));
}
VERBOSE("GPIO %u mode set to 0x%x\n", bank,
mmio_read_32(base + GPIO_MODE_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));
stm32mp_clk_disable(clock);
if (status == DT_SECURE) {
stm32mp_register_secure_gpio(bank, pin);
set_gpio_secure_cfg(bank, pin, true);
} else {
stm32mp_register_non_secure_gpio(bank, pin);
set_gpio_secure_cfg(bank, pin, false);
}
}
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);
stm32mp_clk_enable(clock);
if (secure) {
mmio_setbits_32(base + GPIO_SECR_OFFSET, BIT(pin));
} else {
mmio_clrbits_32(base + GPIO_SECR_OFFSET, BIT(pin));
}
stm32mp_clk_disable(clock);
}
void set_gpio_reset_cfg(uint32_t bank, uint32_t pin)
{
set_gpio(bank, pin, GPIO_MODE_ANALOG, GPIO_SPEED_LOW,
GPIO_NO_PULL, GPIO_ALTERNATE_(0), DT_DISABLED);
set_gpio_secure_cfg(bank, pin, stm32_gpio_is_secure_at_reset(bank));
}