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dm: gpio: Add driver for stm32f7 gpio controller

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This patch adds gpio driver supporting driver model for stm32f7 gpio.

Signed-off-by: Vikas Manocha <vikas.manocha@st.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Cc: Christophe KERELLO <christophe.kerello@st.com>
[trini: Add depends on STM32]
Signed-off-by: Tom Rini <trini@konsulko.com>
This commit is contained in:
Vikas Manocha
2017-04-10 15:02:57 -07:00
committed by Tom Rini
parent 6c9a10034a
commit 774171020b
5 changed files with 198 additions and 5 deletions
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135
drivers/gpio/stm32f7_gpio.c Normal file
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/*
* (C) Copyright 2017
* Vikas Manocha, <vikas.manocha@st.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#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 MAX_SIZE_BANK_NAME 5
#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))
DECLARE_GLOBAL_DATA_PTR;
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(&regs->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(&regs->moder, mask, STM32_GPIO_MODE_OUT << bits_index);
mask = IN_OUT_BIT_INDEX(offset);
clrsetbits_le32(&regs->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(&regs->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(&regs->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;
char *name;
addr = dev_get_addr(dev);
if (addr == FDT_ADDR_T_NONE)
return -EINVAL;
priv->regs = (struct stm32_gpio_regs *)addr;
name = (char *)fdtdec_locate_byte_array(gd->fdt_blob,
dev_of_offset(dev),
"st,bank-name",
MAX_SIZE_BANK_NAME);
if (!name)
return -EINVAL;
uc_priv->bank_name = name;
uc_priv->gpio_count = 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),
};