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u-boot/drivers/gpio/stm32_gpio.c
Patrick Delaunay cb08e84d68 gpio: stm32: check result of ofnode_phandle_args 
Add test on the size of ofnode_phandle_args result to avoid access
to uninitialized elements in args[] field.

This patch avoids the issue when gpio-ranges cell size is not 3 as
expected, for example:
	gpio-ranges = <&pinctrl 0>;
instead of
	gpio-ranges = <&pinctrl 0 112 16>;

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@st.com>
2020-10-02 15:05:14 +02:00

344 lines
7.9 KiB
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// 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 <log.h>
#include <asm/arch/gpio.h>
#include <asm/arch/stm32.h>
#include <asm/gpio.h>
#include <asm/io.h>
#include <dm/device_compat.h>
#include <linux/bitops.h>
#include <linux/errno.h>
#include <linux/io.h>
#define MODE_BITS(gpio_pin) ((gpio_pin) * 2)
#define MODE_BITS_MASK 3
#define BSRR_BIT(gpio_pin, value) BIT((gpio_pin) + (value ? 0 : 16))
#define PUPD_BITS(gpio_pin) ((gpio_pin) * 2)
#define PUPD_MASK 3
#define OTYPE_BITS(gpio_pin) (gpio_pin)
#define OTYPE_MSK 1
static void stm32_gpio_set_moder(struct stm32_gpio_regs *regs,
int idx,
int mode)
{
int bits_index;
int mask;
bits_index = MODE_BITS(idx);
mask = MODE_BITS_MASK << bits_index;
clrsetbits_le32(&regs->moder, mask, mode << bits_index);
}
static int stm32_gpio_get_moder(struct stm32_gpio_regs *regs, int idx)
{
return (readl(&regs->moder) >> MODE_BITS(idx)) & MODE_BITS_MASK;
}
static void stm32_gpio_set_otype(struct stm32_gpio_regs *regs,
int idx,
enum stm32_gpio_otype otype)
{
int bits;
bits = OTYPE_BITS(idx);
clrsetbits_le32(&regs->otyper, OTYPE_MSK << bits, otype << bits);
}
static enum stm32_gpio_otype stm32_gpio_get_otype(struct stm32_gpio_regs *regs,
int idx)
{
return (readl(&regs->otyper) >> OTYPE_BITS(idx)) & OTYPE_MSK;
}
static void stm32_gpio_set_pupd(struct stm32_gpio_regs *regs,
int idx,
enum stm32_gpio_pupd pupd)
{
int bits;
bits = PUPD_BITS(idx);
clrsetbits_le32(&regs->pupdr, PUPD_MASK << bits, pupd << bits);
}
static enum stm32_gpio_pupd stm32_gpio_get_pupd(struct stm32_gpio_regs *regs,
int idx)
{
return (readl(&regs->pupdr) >> PUPD_BITS(idx)) & PUPD_MASK;
}
/*
* convert gpio offset to gpio index taking into account gpio holes
* into gpio bank
*/
int stm32_offset_to_index(struct udevice *dev, unsigned int offset)
{
struct stm32_gpio_priv *priv = dev_get_priv(dev);
unsigned int idx = 0;
int i;
for (i = 0; i < STM32_GPIOS_PER_BANK; i++) {
if (priv->gpio_range & BIT(i)) {
if (idx == offset)
return idx;
idx++;
}
}
/* shouldn't happen */
return -EINVAL;
}
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 idx;
idx = stm32_offset_to_index(dev, offset);
if (idx < 0)
return idx;
stm32_gpio_set_moder(regs, idx, STM32_GPIO_MODE_IN);
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 idx;
idx = stm32_offset_to_index(dev, offset);
if (idx < 0)
return idx;
stm32_gpio_set_moder(regs, idx, STM32_GPIO_MODE_OUT);
writel(BSRR_BIT(idx, value), &regs->bsrr);
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;
int idx;
idx = stm32_offset_to_index(dev, offset);
if (idx < 0)
return idx;
return readl(&regs->idr) & BIT(idx) ? 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 idx;
idx = stm32_offset_to_index(dev, offset);
if (idx < 0)
return idx;
writel(BSRR_BIT(idx, value), &regs->bsrr);
return 0;
}
static int stm32_gpio_get_function(struct udevice *dev, unsigned int offset)
{
struct stm32_gpio_priv *priv = dev_get_priv(dev);
struct stm32_gpio_regs *regs = priv->regs;
int bits_index;
int mask;
int idx;
u32 mode;
idx = stm32_offset_to_index(dev, offset);
if (idx < 0)
return idx;
bits_index = MODE_BITS(idx);
mask = MODE_BITS_MASK << bits_index;
mode = (readl(&regs->moder) & mask) >> bits_index;
if (mode == STM32_GPIO_MODE_OUT)
return GPIOF_OUTPUT;
if (mode == STM32_GPIO_MODE_IN)
return GPIOF_INPUT;
if (mode == STM32_GPIO_MODE_AN)
return GPIOF_UNUSED;
return GPIOF_FUNC;
}
static int stm32_gpio_set_dir_flags(struct udevice *dev, unsigned int offset,
ulong flags)
{
struct stm32_gpio_priv *priv = dev_get_priv(dev);
struct stm32_gpio_regs *regs = priv->regs;
int idx;
idx = stm32_offset_to_index(dev, offset);
if (idx < 0)
return idx;
if (flags & GPIOD_IS_OUT) {
int value = GPIOD_FLAGS_OUTPUT(flags);
if (flags & GPIOD_OPEN_DRAIN)
stm32_gpio_set_otype(regs, idx, STM32_GPIO_OTYPE_OD);
else
stm32_gpio_set_otype(regs, idx, STM32_GPIO_OTYPE_PP);
stm32_gpio_set_moder(regs, idx, STM32_GPIO_MODE_OUT);
writel(BSRR_BIT(idx, value), &regs->bsrr);
} else if (flags & GPIOD_IS_IN) {
stm32_gpio_set_moder(regs, idx, STM32_GPIO_MODE_IN);
if (flags & GPIOD_PULL_UP)
stm32_gpio_set_pupd(regs, idx, STM32_GPIO_PUPD_UP);
else if (flags & GPIOD_PULL_DOWN)
stm32_gpio_set_pupd(regs, idx, STM32_GPIO_PUPD_DOWN);
}
return 0;
}
static int stm32_gpio_get_dir_flags(struct udevice *dev, unsigned int offset,
ulong *flags)
{
struct stm32_gpio_priv *priv = dev_get_priv(dev);
struct stm32_gpio_regs *regs = priv->regs;
int idx;
ulong dir_flags = 0;
idx = stm32_offset_to_index(dev, offset);
if (idx < 0)
return idx;
switch (stm32_gpio_get_moder(regs, idx)) {
case STM32_GPIO_MODE_OUT:
dir_flags |= GPIOD_IS_OUT;
if (stm32_gpio_get_otype(regs, idx) == STM32_GPIO_OTYPE_OD)
dir_flags |= GPIOD_OPEN_DRAIN;
if (readl(&regs->idr) & BIT(idx))
dir_flags |= GPIOD_IS_OUT_ACTIVE;
break;
case STM32_GPIO_MODE_IN:
dir_flags |= GPIOD_IS_IN;
switch (stm32_gpio_get_pupd(regs, idx)) {
case STM32_GPIO_PUPD_UP:
dir_flags |= GPIOD_PULL_UP;
break;
case STM32_GPIO_PUPD_DOWN:
dir_flags |= GPIOD_PULL_DOWN;
break;
default:
break;
}
break;
default:
break;
}
*flags = dir_flags;
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,
.get_function = stm32_gpio_get_function,
.set_dir_flags = stm32_gpio_set_dir_flags,
.get_dir_flags = stm32_gpio_get_dir_flags,
};
static int gpio_stm32_probe(struct udevice *dev)
{
struct stm32_gpio_priv *priv = dev_get_priv(dev);
struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
struct ofnode_phandle_args args;
const char *name;
struct clk clk;
fdt_addr_t addr;
int ret, i;
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;
i = 0;
ret = dev_read_phandle_with_args(dev, "gpio-ranges",
NULL, 3, i, &args);
if (!ret && args.args_count < 3)
return -EINVAL;
if (ret == -ENOENT) {
uc_priv->gpio_count = STM32_GPIOS_PER_BANK;
priv->gpio_range = GENMASK(STM32_GPIOS_PER_BANK - 1, 0);
}
while (ret != -ENOENT) {
priv->gpio_range |= GENMASK(args.args[2] + args.args[0] - 1,
args.args[0]);
uc_priv->gpio_count += args.args[2];
ret = dev_read_phandle_with_args(dev, "gpio-ranges", NULL, 3,
++i, &args);
if (!ret && args.args_count < 3)
return -EINVAL;
}
dev_dbg(dev, "addr = 0x%p bank_name = %s gpio_count = %d gpio_range = 0x%x\n",
(u32 *)priv->regs, uc_priv->bank_name, uc_priv->gpio_count,
priv->gpio_range);
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);
return 0;
}
U_BOOT_DRIVER(gpio_stm32) = {
.name = "gpio_stm32",
.id = UCLASS_GPIO,
.probe = gpio_stm32_probe,
.ops = &gpio_stm32_ops,
.flags = DM_UC_FLAG_SEQ_ALIAS,
.priv_auto_alloc_size = sizeof(struct stm32_gpio_priv),
};
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