gpio-uniphier.c
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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2016-2017 Socionext Inc.
* Author: Masahiro Yamada <yamada.masahiro@socionext.com>
*/
#include <common.h>
#include <dm.h>
#include <linux/bitops.h>
#include <linux/io.h>
#include <linux/sizes.h>
#include <linux/errno.h>
#include <asm/global_data.h>
#include <asm/gpio.h>
#include <dt-bindings/gpio/uniphier-gpio.h>
#define UNIPHIER_GPIO_PORT_DATA 0x0 /* data */
#define UNIPHIER_GPIO_PORT_DIR 0x4 /* direction (1:in, 0:out) */
#define UNIPHIER_GPIO_IRQ_EN 0x90 /* irq enable */
struct uniphier_gpio_priv {
void __iomem *regs;
};
static unsigned int uniphier_gpio_bank_to_reg(unsigned int bank)
{
unsigned int reg;
reg = (bank + 1) * 8;
/*
* Unfortunately, the GPIO port registers are not contiguous because
* offset 0x90-0x9f is used for IRQ. Add 0x10 when crossing the region.
*/
if (reg >= UNIPHIER_GPIO_IRQ_EN)
reg += 0x10;
return reg;
}
static void uniphier_gpio_get_bank_and_mask(unsigned int offset,
unsigned int *bank, u32 *mask)
{
*bank = offset / UNIPHIER_GPIO_LINES_PER_BANK;
*mask = BIT(offset % UNIPHIER_GPIO_LINES_PER_BANK);
}
static void uniphier_gpio_reg_update(struct uniphier_gpio_priv *priv,
unsigned int reg, u32 mask, u32 val)
{
u32 tmp;
tmp = readl(priv->regs + reg);
tmp &= ~mask;
tmp |= mask & val;
writel(tmp, priv->regs + reg);
}
static void uniphier_gpio_bank_write(struct udevice *dev, unsigned int bank,
unsigned int reg, u32 mask, u32 val)
{
struct uniphier_gpio_priv *priv = dev_get_priv(dev);
if (!mask)
return;
uniphier_gpio_reg_update(priv, uniphier_gpio_bank_to_reg(bank) + reg,
mask, val);
}
static void uniphier_gpio_offset_write(struct udevice *dev, unsigned int offset,
unsigned int reg, int val)
{
unsigned int bank;
u32 mask;
uniphier_gpio_get_bank_and_mask(offset, &bank, &mask);
uniphier_gpio_bank_write(dev, bank, reg, mask, val ? mask : 0);
}
static int uniphier_gpio_offset_read(struct udevice *dev,
unsigned int offset, unsigned int reg)
{
struct uniphier_gpio_priv *priv = dev_get_priv(dev);
unsigned int bank, reg_offset;
u32 mask;
uniphier_gpio_get_bank_and_mask(offset, &bank, &mask);
reg_offset = uniphier_gpio_bank_to_reg(bank) + reg;
return !!(readl(priv->regs + reg_offset) & mask);
}
static int uniphier_gpio_get_function(struct udevice *dev, unsigned int offset)
{
return uniphier_gpio_offset_read(dev, offset, UNIPHIER_GPIO_PORT_DIR) ?
GPIOF_INPUT : GPIOF_OUTPUT;
}
static int uniphier_gpio_direction_input(struct udevice *dev,
unsigned int offset)
{
uniphier_gpio_offset_write(dev, offset, UNIPHIER_GPIO_PORT_DIR, 1);
return 0;
}
static int uniphier_gpio_direction_output(struct udevice *dev,
unsigned int offset, int value)
{
uniphier_gpio_offset_write(dev, offset, UNIPHIER_GPIO_PORT_DATA, value);
uniphier_gpio_offset_write(dev, offset, UNIPHIER_GPIO_PORT_DIR, 0);
return 0;
}
static int uniphier_gpio_get_value(struct udevice *dev, unsigned int offset)
{
return uniphier_gpio_offset_read(dev, offset, UNIPHIER_GPIO_PORT_DATA);
}
static int uniphier_gpio_set_value(struct udevice *dev,
unsigned int offset, int value)
{
uniphier_gpio_offset_write(dev, offset, UNIPHIER_GPIO_PORT_DATA, value);
return 0;
}
static const struct dm_gpio_ops uniphier_gpio_ops = {
.direction_input = uniphier_gpio_direction_input,
.direction_output = uniphier_gpio_direction_output,
.get_value = uniphier_gpio_get_value,
.set_value = uniphier_gpio_set_value,
.get_function = uniphier_gpio_get_function,
};
static int uniphier_gpio_probe(struct udevice *dev)
{
struct uniphier_gpio_priv *priv = dev_get_priv(dev);
struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
fdt_addr_t addr;
addr = devfdt_get_addr(dev);
if (addr == FDT_ADDR_T_NONE)
return -EINVAL;
priv->regs = devm_ioremap(dev, addr, SZ_512);
if (!priv->regs)
return -ENOMEM;
uc_priv->gpio_count = fdtdec_get_uint(gd->fdt_blob, dev_of_offset(dev),
"ngpios", 0);
return 0;
}
static const struct udevice_id uniphier_gpio_match[] = {
{ .compatible = "socionext,uniphier-gpio" },
{ /* sentinel */ }
};
U_BOOT_DRIVER(uniphier_gpio) = {
.name = "uniphier-gpio",
.id = UCLASS_GPIO,
.of_match = uniphier_gpio_match,
.probe = uniphier_gpio_probe,
.priv_auto_alloc_size = sizeof(struct uniphier_gpio_priv),
.ops = &uniphier_gpio_ops,
};