mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-19 03:08:31 +00:00
83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
129 lines
3.3 KiB
C
129 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Copyright (C) 2017, STMicroelectronics - All Rights Reserved
|
|
* Author(s): Vikas Manocha, <vikas.manocha@st.com> for STMicroelectronics.
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <clk.h>
|
|
#include <dm.h>
|
|
#include <fdtdec.h>
|
|
#include <asm/arch/gpio.h>
|
|
#include <asm/arch/stm32.h>
|
|
#include <asm/gpio.h>
|
|
#include <asm/io.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/io.h>
|
|
|
|
#define STM32_GPIOS_PER_BANK 16
|
|
#define MODE_BITS(gpio_pin) (gpio_pin * 2)
|
|
#define MODE_BITS_MASK 3
|
|
#define IN_OUT_BIT_INDEX(gpio_pin) (1UL << (gpio_pin))
|
|
|
|
static int stm32_gpio_direction_input(struct udevice *dev, unsigned offset)
|
|
{
|
|
struct stm32_gpio_priv *priv = dev_get_priv(dev);
|
|
struct stm32_gpio_regs *regs = priv->regs;
|
|
int bits_index = MODE_BITS(offset);
|
|
int mask = MODE_BITS_MASK << bits_index;
|
|
|
|
clrsetbits_le32(®s->moder, mask, STM32_GPIO_MODE_IN << bits_index);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int stm32_gpio_direction_output(struct udevice *dev, unsigned offset,
|
|
int value)
|
|
{
|
|
struct stm32_gpio_priv *priv = dev_get_priv(dev);
|
|
struct stm32_gpio_regs *regs = priv->regs;
|
|
int bits_index = MODE_BITS(offset);
|
|
int mask = MODE_BITS_MASK << bits_index;
|
|
|
|
clrsetbits_le32(®s->moder, mask, STM32_GPIO_MODE_OUT << bits_index);
|
|
mask = IN_OUT_BIT_INDEX(offset);
|
|
clrsetbits_le32(®s->odr, mask, value ? mask : 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int stm32_gpio_get_value(struct udevice *dev, unsigned offset)
|
|
{
|
|
struct stm32_gpio_priv *priv = dev_get_priv(dev);
|
|
struct stm32_gpio_regs *regs = priv->regs;
|
|
|
|
return readl(®s->idr) & IN_OUT_BIT_INDEX(offset) ? 1 : 0;
|
|
}
|
|
|
|
static int stm32_gpio_set_value(struct udevice *dev, unsigned offset, int value)
|
|
{
|
|
struct stm32_gpio_priv *priv = dev_get_priv(dev);
|
|
struct stm32_gpio_regs *regs = priv->regs;
|
|
int mask = IN_OUT_BIT_INDEX(offset);
|
|
|
|
clrsetbits_le32(®s->odr, mask, value ? mask : 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct dm_gpio_ops gpio_stm32_ops = {
|
|
.direction_input = stm32_gpio_direction_input,
|
|
.direction_output = stm32_gpio_direction_output,
|
|
.get_value = stm32_gpio_get_value,
|
|
.set_value = stm32_gpio_set_value,
|
|
};
|
|
|
|
static int gpio_stm32_probe(struct udevice *dev)
|
|
{
|
|
struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
|
|
struct stm32_gpio_priv *priv = dev_get_priv(dev);
|
|
fdt_addr_t addr;
|
|
const char *name;
|
|
|
|
addr = dev_read_addr(dev);
|
|
if (addr == FDT_ADDR_T_NONE)
|
|
return -EINVAL;
|
|
|
|
priv->regs = (struct stm32_gpio_regs *)addr;
|
|
name = dev_read_string(dev, "st,bank-name");
|
|
if (!name)
|
|
return -EINVAL;
|
|
uc_priv->bank_name = name;
|
|
uc_priv->gpio_count = dev_read_u32_default(dev, "ngpios",
|
|
STM32_GPIOS_PER_BANK);
|
|
debug("%s, addr = 0x%p, bank_name = %s\n", __func__, (u32 *)priv->regs,
|
|
uc_priv->bank_name);
|
|
|
|
#ifdef CONFIG_CLK
|
|
struct clk clk;
|
|
int ret;
|
|
ret = clk_get_by_index(dev, 0, &clk);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = clk_enable(&clk);
|
|
|
|
if (ret) {
|
|
dev_err(dev, "failed to enable clock\n");
|
|
return ret;
|
|
}
|
|
debug("clock enabled for device %s\n", dev->name);
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct udevice_id stm32_gpio_ids[] = {
|
|
{ .compatible = "st,stm32-gpio" },
|
|
{ }
|
|
};
|
|
|
|
U_BOOT_DRIVER(gpio_stm32) = {
|
|
.name = "gpio_stm32",
|
|
.id = UCLASS_GPIO,
|
|
.of_match = stm32_gpio_ids,
|
|
.probe = gpio_stm32_probe,
|
|
.ops = &gpio_stm32_ops,
|
|
.flags = DM_FLAG_PRE_RELOC | DM_UC_FLAG_SEQ_ALIAS,
|
|
.priv_auto_alloc_size = sizeof(struct stm32_gpio_priv),
|
|
};
|