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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/io.h>
#include <asm/gpio.h>
#include <dt-bindings/gpio/gpio.h>
#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 */
#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-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_get_value(struct udevice *dev, unsigned offset)
{
struct sunxi_gpio_plat *plat = dev_get_plat(dev);
u32 num = GPIO_NUM(offset);
unsigned dat;
dat = readl(&plat->regs->dat);
dat >>= num;
return dat & 0x1;
}
static int sunxi_gpio_get_function(struct udevice *dev, unsigned offset)
{
struct sunxi_gpio_plat *plat = dev_get_plat(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 = gpio_flags_xlate(args->args[2]);
return 0;
}
static int sunxi_gpio_set_flags(struct udevice *dev, unsigned int offset,
ulong flags)
{
struct sunxi_gpio_plat *plat = dev_get_plat(dev);
if (flags & GPIOD_IS_OUT) {
u32 value = !!(flags & GPIOD_IS_OUT_ACTIVE);
u32 num = GPIO_NUM(offset);
clrsetbits_le32(&plat->regs->dat, 1 << num, value << num);
sunxi_gpio_set_cfgbank(plat->regs, offset, SUNXI_GPIO_OUTPUT);
} else if (flags & GPIOD_IS_IN) {
u32 pull = 0;
if (flags & GPIOD_PULL_UP)
pull = 1;
else if (flags & GPIOD_PULL_DOWN)
pull = 2;
sunxi_gpio_set_pull_bank(plat->regs, offset, pull);
sunxi_gpio_set_cfgbank(plat->regs, offset, SUNXI_GPIO_INPUT);
}
return 0;
}
static const struct dm_gpio_ops gpio_sunxi_ops = {
.get_value = sunxi_gpio_get_value,
.get_function = sunxi_gpio_get_function,
.xlate = sunxi_gpio_xlate,
.set_flags = sunxi_gpio_set_flags,
};
static int gpio_sunxi_probe(struct udevice *dev)
{
struct sunxi_gpio_plat *plat = dev_get_plat(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 = SUNXI_GPIOS_PER_BANK;
uc_priv->bank_name = plat->bank_name;
}
return 0;
}
U_BOOT_DRIVER(gpio_sunxi) = {
.name = "gpio_sunxi",
.id = UCLASS_GPIO,
.probe = gpio_sunxi_probe,
.ops = &gpio_sunxi_ops,
};
#endif /* DM_GPIO */
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