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/*
* (C) Copyright 2011
* Yuri Tikhonov, Emcraft Systems, yur@emcraft.com
*
* (C) Copyright 2015
* Copyright 2015 ATS Advanced Telematics Systems GmbH
* Copyright 2015 Konsulko Group, Matt Porter <mporter@konsulko.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/io.h>
#include <linux/errno.h>
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#include <asm/arch/stm32.h>
#include <asm/arch/gpio.h>
DECLARE_GLOBAL_DATA_PTR;
static const unsigned long io_base[] = {
STM32_GPIOA_BASE, STM32_GPIOB_BASE, STM32_GPIOC_BASE,
STM32_GPIOD_BASE, STM32_GPIOE_BASE, STM32_GPIOF_BASE,
STM32_GPIOG_BASE, STM32_GPIOH_BASE, STM32_GPIOI_BASE
};
struct stm32_gpio_regs {
u32 moder; /* GPIO port mode */
u32 otyper; /* GPIO port output type */
u32 ospeedr; /* GPIO port output speed */
u32 pupdr; /* GPIO port pull-up/pull-down */
u32 idr; /* GPIO port input data */
u32 odr; /* GPIO port output data */
u32 bsrr; /* GPIO port bit set/reset */
u32 lckr; /* GPIO port configuration lock */
u32 afr[2]; /* GPIO alternate function */
};
#define CHECK_DSC(x) (!x || x->port > 8 || x->pin > 15)
#define CHECK_CTL(x) (!x || x->af > 15 || x->mode > 3 || x->otype > 1 || \
x->pupd > 2 || x->speed > 3)
int stm32_gpio_config(const struct stm32_gpio_dsc *dsc,
const struct stm32_gpio_ctl *ctl)
{
struct stm32_gpio_regs *gpio_regs;
u32 i;
int rv;
if (CHECK_DSC(dsc)) {
rv = -EINVAL;
goto out;
}
if (CHECK_CTL(ctl)) {
rv = -EINVAL;
goto out;
}
gpio_regs = (struct stm32_gpio_regs *)io_base[dsc->port];
i = (dsc->pin & 0x07) * 4;
clrsetbits_le32(&gpio_regs->afr[dsc->pin >> 3], 0xF << i, ctl->af << i);
clrsetbits_le32(&gpio_regs->moder, 0x3 << i, ctl->mode << i);
clrsetbits_le32(&gpio_regs->otyper, 0x3 << i, ctl->otype << i);
clrsetbits_le32(&gpio_regs->ospeedr, 0x3 << i, ctl->speed << i);
clrsetbits_le32(&gpio_regs->pupdr, 0x3 << i, ctl->pupd << i);
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rv = 0;
out:
return rv;
}
int stm32_gpout_set(const struct stm32_gpio_dsc *dsc, int state)
{
struct stm32_gpio_regs *gpio_regs;
int rv;
if (CHECK_DSC(dsc)) {
rv = -EINVAL;
goto out;
}
gpio_regs = (struct stm32_gpio_regs *)io_base[dsc->port];
if (state)
writel(1 << dsc->pin, &gpio_regs->bsrr);
else
writel(1 << (dsc->pin + 16), &gpio_regs->bsrr);
rv = 0;
out:
return rv;
}
int stm32_gpin_get(const struct stm32_gpio_dsc *dsc)
{
struct stm32_gpio_regs *gpio_regs;
int rv;
if (CHECK_DSC(dsc)) {
rv = -EINVAL;
goto out;
}
gpio_regs = (struct stm32_gpio_regs *)io_base[dsc->port];
rv = readl(&gpio_regs->idr) & (1 << dsc->pin);
out:
return rv;
}
/* Common GPIO API */
int gpio_request(unsigned gpio, const char *label)
{
return 0;
}
int gpio_free(unsigned gpio)
{
return 0;
}
int gpio_direction_input(unsigned gpio)
{
struct stm32_gpio_dsc dsc;
struct stm32_gpio_ctl ctl;
dsc.port = stm32_gpio_to_port(gpio);
dsc.pin = stm32_gpio_to_pin(gpio);
ctl.af = STM32_GPIO_AF0;
ctl.mode = STM32_GPIO_MODE_IN;
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ctl.pupd = STM32_GPIO_PUPD_NO;
ctl.speed = STM32_GPIO_SPEED_50M;
return stm32_gpio_config(&dsc, &ctl);
}
int gpio_direction_output(unsigned gpio, int value)
{
struct stm32_gpio_dsc dsc;
struct stm32_gpio_ctl ctl;
int res;
dsc.port = stm32_gpio_to_port(gpio);
dsc.pin = stm32_gpio_to_pin(gpio);
ctl.af = STM32_GPIO_AF0;
ctl.mode = STM32_GPIO_MODE_OUT;
ctl.pupd = STM32_GPIO_PUPD_NO;
ctl.speed = STM32_GPIO_SPEED_50M;
res = stm32_gpio_config(&dsc, &ctl);
if (res < 0)
goto out;
res = stm32_gpout_set(&dsc, value);
out:
return res;
}
int gpio_get_value(unsigned gpio)
{
struct stm32_gpio_dsc dsc;
dsc.port = stm32_gpio_to_port(gpio);
dsc.pin = stm32_gpio_to_pin(gpio);
return stm32_gpin_get(&dsc);
}
int gpio_set_value(unsigned gpio, int value)
{
struct stm32_gpio_dsc dsc;
dsc.port = stm32_gpio_to_port(gpio);
dsc.pin = stm32_gpio_to_pin(gpio);
return stm32_gpout_set(&dsc, value);
}