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u-boot/drivers/gpio/sunxi_gpio.c
Masahiro Yamada 8613c8d897 treewide: convert (void *)devfdt_get_addr() to dev_read_addr_ptr() 
Use the _ptr suffixed variant instead of casting. Also, convert it to
dev_read_addr_ptr(), which is safe to CONFIG_OF_LIVE.

One curious part is an error check like follows in
drivers/watchdog/omap_wdt.c:

    priv->regs = (struct wd_timer *)devfdt_get_addr(dev);
    if (!priv->regs)
            return -EINVAL;

devfdt_get_addr() returns FDT_ADDR_T_NONE (i.e. -1) on error.
So, this code does not catch any error in DT parsing.

dev_read_addr_ptr() returns NULL on error, so this error check
will work.

I generated this commit by the following command:

 $ find . -name .git -prune -o -name '*.[ch]' -type f -print | \
   xargs sed -i -e 's/([^*)]*\*)devfdt_get_addr(/dev_read_addr_ptr(/'

I manually fixed drivers/usb/host/ehci-mx6.c

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2020-07-25 14:46:57 -06:00

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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2012 Henrik Nordstrom <henrik@henriknordstrom.net>
*
* Based on earlier arch/arm/cpu/armv7/sunxi/gpio.c:
*
* (C) Copyright 2007-2011
* Allwinner Technology Co., Ltd. <www.allwinnertech.com>
* Tom Cubie <tangliang@allwinnertech.com>
*/
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <fdtdec.h>
#include <malloc.h>
#include <asm/arch/gpio.h>
#include <asm/io.h>
#include <asm/gpio.h>
#include <dm/device-internal.h>
#include <dt-bindings/gpio/gpio.h>
#define SUNXI_GPIOS_PER_BANK SUNXI_GPIO_A_NR
struct sunxi_gpio_platdata {
struct sunxi_gpio *regs;
const char *bank_name; /* Name of bank, e.g. "B" */
int gpio_count;
};
#if !CONFIG_IS_ENABLED(DM_GPIO)
static int sunxi_gpio_output(u32 pin, u32 val)
{
u32 dat;
u32 bank = GPIO_BANK(pin);
u32 num = GPIO_NUM(pin);
struct sunxi_gpio *pio = BANK_TO_GPIO(bank);
dat = readl(&pio->dat);
if (val)
dat |= 0x1 << num;
else
dat &= ~(0x1 << num);
writel(dat, &pio->dat);
return 0;
}
static int sunxi_gpio_input(u32 pin)
{
u32 dat;
u32 bank = GPIO_BANK(pin);
u32 num = GPIO_NUM(pin);
struct sunxi_gpio *pio = BANK_TO_GPIO(bank);
dat = readl(&pio->dat);
dat >>= num;
return dat & 0x1;
}
int gpio_request(unsigned gpio, const char *label)
{
return 0;
}
int gpio_free(unsigned gpio)
{
return 0;
}
int gpio_direction_input(unsigned gpio)
{
sunxi_gpio_set_cfgpin(gpio, SUNXI_GPIO_INPUT);
return 0;
}
int gpio_direction_output(unsigned gpio, int value)
{
sunxi_gpio_set_cfgpin(gpio, SUNXI_GPIO_OUTPUT);
return sunxi_gpio_output(gpio, value);
}
int gpio_get_value(unsigned gpio)
{
return sunxi_gpio_input(gpio);
}
int gpio_set_value(unsigned gpio, int value)
{
return sunxi_gpio_output(gpio, value);
}
int sunxi_name_to_gpio(const char *name)
{
int group = 0;
int groupsize = 9 * 32;
long pin;
char *eptr;
if (*name == 'P' || *name == 'p')
name++;
if (*name >= 'A') {
group = *name - (*name > 'a' ? 'a' : 'A');
groupsize = 32;
name++;
}
pin = simple_strtol(name, &eptr, 10);
if (!*name || *eptr)
return -1;
if (pin < 0 || pin > groupsize || group >= 9)
return -1;
return group * 32 + pin;
}
#endif /* DM_GPIO */
int sunxi_name_to_gpio_bank(const char *name)
{
int group = 0;
if (*name == 'P' || *name == 'p')
name++;
if (*name >= 'A') {
group = *name - (*name > 'a' ? 'a' : 'A');
return group;
}
return -1;
}
#if CONFIG_IS_ENABLED(DM_GPIO)
/* TODO(sjg@chromium.org): Remove this function and use device tree */
int sunxi_name_to_gpio(const char *name)
{
unsigned int gpio;
int ret;
#if !defined CONFIG_SPL_BUILD && defined CONFIG_AXP_GPIO
char lookup[8];
if (strcasecmp(name, "AXP0-VBUS-DETECT") == 0) {
sprintf(lookup, SUNXI_GPIO_AXP0_PREFIX "%d",
SUNXI_GPIO_AXP0_VBUS_DETECT);
name = lookup;
} else if (strcasecmp(name, "AXP0-VBUS-ENABLE") == 0) {
sprintf(lookup, SUNXI_GPIO_AXP0_PREFIX "%d",
SUNXI_GPIO_AXP0_VBUS_ENABLE);
name = lookup;
}
#endif
ret = gpio_lookup_name(name, NULL, NULL, &gpio);
return ret ? ret : gpio;
}
static int sunxi_gpio_direction_input(struct udevice *dev, unsigned offset)
{
struct sunxi_gpio_platdata *plat = dev_get_platdata(dev);
sunxi_gpio_set_cfgbank(plat->regs, offset, SUNXI_GPIO_INPUT);
return 0;
}
static int sunxi_gpio_direction_output(struct udevice *dev, unsigned offset,
int value)
{
struct sunxi_gpio_platdata *plat = dev_get_platdata(dev);
u32 num = GPIO_NUM(offset);
sunxi_gpio_set_cfgbank(plat->regs, offset, SUNXI_GPIO_OUTPUT);
clrsetbits_le32(&plat->regs->dat, 1 << num, value ? (1 << num) : 0);
return 0;
}
static int sunxi_gpio_get_value(struct udevice *dev, unsigned offset)
{
struct sunxi_gpio_platdata *plat = dev_get_platdata(dev);
u32 num = GPIO_NUM(offset);
unsigned dat;
dat = readl(&plat->regs->dat);
dat >>= num;
return dat & 0x1;
}
static int sunxi_gpio_set_value(struct udevice *dev, unsigned offset,
int value)
{
struct sunxi_gpio_platdata *plat = dev_get_platdata(dev);
u32 num = GPIO_NUM(offset);
clrsetbits_le32(&plat->regs->dat, 1 << num, value ? (1 << num) : 0);
return 0;
}
static int sunxi_gpio_get_function(struct udevice *dev, unsigned offset)
{
struct sunxi_gpio_platdata *plat = dev_get_platdata(dev);
int func;
func = sunxi_gpio_get_cfgbank(plat->regs, offset);
if (func == SUNXI_GPIO_OUTPUT)
return GPIOF_OUTPUT;
else if (func == SUNXI_GPIO_INPUT)
return GPIOF_INPUT;
else
return GPIOF_FUNC;
}
static int sunxi_gpio_xlate(struct udevice *dev, struct gpio_desc *desc,
struct ofnode_phandle_args *args)
{
int ret;
ret = device_get_child(dev, args->args[0], &desc->dev);
if (ret)
return ret;
desc->offset = args->args[1];
desc->flags = args->args[2] & GPIO_ACTIVE_LOW ? GPIOD_ACTIVE_LOW : 0;
return 0;
}
static const struct dm_gpio_ops gpio_sunxi_ops = {
.direction_input = sunxi_gpio_direction_input,
.direction_output = sunxi_gpio_direction_output,
.get_value = sunxi_gpio_get_value,
.set_value = sunxi_gpio_set_value,
.get_function = sunxi_gpio_get_function,
.xlate = sunxi_gpio_xlate,
};
/**
* Returns the name of a GPIO bank
*
* GPIO banks are named A, B, C, ...
*
* @bank: Bank number (0, 1..n-1)
* @return allocated string containing the name
*/
static char *gpio_bank_name(int bank)
{
char *name;
name = malloc(3);
if (name) {
name[0] = 'P';
name[1] = 'A' + bank;
name[2] = '\0';
}
return name;
}
static int gpio_sunxi_probe(struct udevice *dev)
{
struct sunxi_gpio_platdata *plat = dev_get_platdata(dev);
struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
/* Tell the uclass how many GPIOs we have */
if (plat) {
uc_priv->gpio_count = plat->gpio_count;
uc_priv->bank_name = plat->bank_name;
}
return 0;
}
struct sunxi_gpio_soc_data {
int start;
int no_banks;
};
/**
* We have a top-level GPIO device with no actual GPIOs. It has a child
* device for each Sunxi bank.
*/
static int gpio_sunxi_bind(struct udevice *parent)
{
struct sunxi_gpio_soc_data *soc_data =
(struct sunxi_gpio_soc_data *)dev_get_driver_data(parent);
struct sunxi_gpio_platdata *plat = parent->platdata;
struct sunxi_gpio_reg *ctlr;
int bank, ret;
/* If this is a child device, there is nothing to do here */
if (plat)
return 0;
ctlr = dev_read_addr_ptr(parent);
for (bank = 0; bank < soc_data->no_banks; bank++) {
struct sunxi_gpio_platdata *plat;
struct udevice *dev;
plat = calloc(1, sizeof(*plat));
if (!plat)
return -ENOMEM;
plat->regs = &ctlr->gpio_bank[bank];
plat->bank_name = gpio_bank_name(soc_data->start + bank);
plat->gpio_count = SUNXI_GPIOS_PER_BANK;
ret = device_bind(parent, parent->driver,
plat->bank_name, plat, -1, &dev);
if (ret)
return ret;
dev_set_of_offset(dev, dev_of_offset(parent));
}
return 0;
}
static const struct sunxi_gpio_soc_data soc_data_a_all = {
.start = 0,
.no_banks = SUNXI_GPIO_BANKS,
};
static const struct sunxi_gpio_soc_data soc_data_l_1 = {
.start = 'L' - 'A',
.no_banks = 1,
};
static const struct sunxi_gpio_soc_data soc_data_l_2 = {
.start = 'L' - 'A',
.no_banks = 2,
};
static const struct sunxi_gpio_soc_data soc_data_l_3 = {
.start = 'L' - 'A',
.no_banks = 3,
};
#define ID(_compat_, _soc_data_) \
{ .compatible = _compat_, .data = (ulong)&soc_data_##_soc_data_ }
static const struct udevice_id sunxi_gpio_ids[] = {
ID("allwinner,sun4i-a10-pinctrl", a_all),
ID("allwinner,sun5i-a10s-pinctrl", a_all),
ID("allwinner,sun5i-a13-pinctrl", a_all),
ID("allwinner,sun50i-h5-pinctrl", a_all),
ID("allwinner,sun6i-a31-pinctrl", a_all),
ID("allwinner,sun6i-a31s-pinctrl", a_all),
ID("allwinner,sun7i-a20-pinctrl", a_all),
ID("allwinner,sun8i-a23-pinctrl", a_all),
ID("allwinner,sun8i-a33-pinctrl", a_all),
ID("allwinner,sun8i-a83t-pinctrl", a_all),
ID("allwinner,sun8i-h3-pinctrl", a_all),
ID("allwinner,sun8i-r40-pinctrl", a_all),
ID("allwinner,sun8i-v3s-pinctrl", a_all),
ID("allwinner,sun9i-a80-pinctrl", a_all),
ID("allwinner,sun50i-a64-pinctrl", a_all),
ID("allwinner,sun50i-h6-pinctrl", a_all),
ID("allwinner,sun6i-a31-r-pinctrl", l_2),
ID("allwinner,sun8i-a23-r-pinctrl", l_1),
ID("allwinner,sun8i-a83t-r-pinctrl", l_1),
ID("allwinner,sun8i-h3-r-pinctrl", l_1),
ID("allwinner,sun9i-a80-r-pinctrl", l_3),
ID("allwinner,sun50i-a64-r-pinctrl", l_1),
ID("allwinner,sun50i-h6-r-pinctrl", l_2),
{ }
};
U_BOOT_DRIVER(gpio_sunxi) = {
.name = "gpio_sunxi",
.id = UCLASS_GPIO,
.ops = &gpio_sunxi_ops,
.of_match = sunxi_gpio_ids,
.bind = gpio_sunxi_bind,
.probe = gpio_sunxi_probe,
};
#endif /* DM_GPIO */
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