gpio-rcar.c
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/*
* Copyright (C) 2017 Marek Vasut <marek.vasut@gmail.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <clk.h>
#include <dm.h>
#include <errno.h>
#include <asm/gpio.h>
#include <asm/io.h>
#include "../pinctrl/renesas/sh_pfc.h"
#define GPIO_IOINTSEL 0x00 /* General IO/Interrupt Switching Register */
#define GPIO_INOUTSEL 0x04 /* General Input/Output Switching Register */
#define GPIO_OUTDT 0x08 /* General Output Register */
#define GPIO_INDT 0x0c /* General Input Register */
#define GPIO_INTDT 0x10 /* Interrupt Display Register */
#define GPIO_INTCLR 0x14 /* Interrupt Clear Register */
#define GPIO_INTMSK 0x18 /* Interrupt Mask Register */
#define GPIO_MSKCLR 0x1c /* Interrupt Mask Clear Register */
#define GPIO_POSNEG 0x20 /* Positive/Negative Logic Select Register */
#define GPIO_EDGLEVEL 0x24 /* Edge/level Select Register */
#define GPIO_FILONOFF 0x28 /* Chattering Prevention On/Off Register */
#define GPIO_BOTHEDGE 0x4c /* One Edge/Both Edge Select Register */
#define RCAR_MAX_GPIO_PER_BANK 32
DECLARE_GLOBAL_DATA_PTR;
struct rcar_gpio_priv {
void __iomem *regs;
int pfc_offset;
};
static int rcar_gpio_get_value(struct udevice *dev, unsigned offset)
{
struct rcar_gpio_priv *priv = dev_get_priv(dev);
const u32 bit = BIT(offset);
/*
* Testing on r8a7790 shows that INDT does not show correct pin state
* when configured as output, so use OUTDT in case of output pins.
*/
if (readl(priv->regs + GPIO_INOUTSEL) & bit)
return !!(readl(priv->regs + GPIO_OUTDT) & bit);
else
return !!(readl(priv->regs + GPIO_INDT) & bit);
}
static int rcar_gpio_set_value(struct udevice *dev, unsigned offset,
int value)
{
struct rcar_gpio_priv *priv = dev_get_priv(dev);
if (value)
setbits_le32(priv->regs + GPIO_OUTDT, BIT(offset));
else
clrbits_le32(priv->regs + GPIO_OUTDT, BIT(offset));
return 0;
}
static void rcar_gpio_set_direction(void __iomem *regs, unsigned offset,
bool output)
{
/*
* follow steps in the GPIO documentation for
* "Setting General Output Mode" and
* "Setting General Input Mode"
*/
/* Configure postive logic in POSNEG */
clrbits_le32(regs + GPIO_POSNEG, BIT(offset));
/* Select "General Input/Output Mode" in IOINTSEL */
clrbits_le32(regs + GPIO_IOINTSEL, BIT(offset));
/* Select Input Mode or Output Mode in INOUTSEL */
if (output)
setbits_le32(regs + GPIO_INOUTSEL, BIT(offset));
else
clrbits_le32(regs + GPIO_INOUTSEL, BIT(offset));
}
static int rcar_gpio_direction_input(struct udevice *dev, unsigned offset)
{
struct rcar_gpio_priv *priv = dev_get_priv(dev);
rcar_gpio_set_direction(priv->regs, offset, false);
return 0;
}
static int rcar_gpio_direction_output(struct udevice *dev, unsigned offset,
int value)
{
struct rcar_gpio_priv *priv = dev_get_priv(dev);
/* write GPIO value to output before selecting output mode of pin */
rcar_gpio_set_value(dev, offset, value);
rcar_gpio_set_direction(priv->regs, offset, true);
return 0;
}
static int rcar_gpio_get_function(struct udevice *dev, unsigned offset)
{
struct rcar_gpio_priv *priv = dev_get_priv(dev);
if (readl(priv->regs + GPIO_INOUTSEL) & BIT(offset))
return GPIOF_OUTPUT;
else
return GPIOF_INPUT;
}
static int rcar_gpio_request(struct udevice *dev, unsigned offset,
const char *label)
{
struct rcar_gpio_priv *priv = dev_get_priv(dev);
struct udevice *pctldev;
int ret;
ret = uclass_get_device(UCLASS_PINCTRL, 0, &pctldev);
if (ret)
return ret;
return sh_pfc_config_mux_for_gpio(pctldev, priv->pfc_offset + offset);
}
static const struct dm_gpio_ops rcar_gpio_ops = {
.request = rcar_gpio_request,
.direction_input = rcar_gpio_direction_input,
.direction_output = rcar_gpio_direction_output,
.get_value = rcar_gpio_get_value,
.set_value = rcar_gpio_set_value,
.get_function = rcar_gpio_get_function,
};
static int rcar_gpio_probe(struct udevice *dev)
{
struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
struct rcar_gpio_priv *priv = dev_get_priv(dev);
struct fdtdec_phandle_args args;
struct clk clk;
int node = dev_of_offset(dev);
int ret;
priv->regs = (void __iomem *)devfdt_get_addr(dev);
uc_priv->bank_name = dev->name;
ret = fdtdec_parse_phandle_with_args(gd->fdt_blob, node, "gpio-ranges",
NULL, 3, 0, &args);
priv->pfc_offset = ret == 0 ? args.args[1] : -1;
uc_priv->gpio_count = ret == 0 ? args.args[2] : RCAR_MAX_GPIO_PER_BANK;
ret = clk_get_by_index(dev, 0, &clk);
if (ret < 0) {
dev_err(dev, "Failed to get GPIO bank clock\n");
return ret;
}
ret = clk_enable(&clk);
clk_free(&clk);
if (ret) {
dev_err(dev, "Failed to enable GPIO bank clock\n");
return ret;
}
return 0;
}
static const struct udevice_id rcar_gpio_ids[] = {
{ .compatible = "renesas,gpio-r8a7795" },
{ .compatible = "renesas,gpio-r8a7796" },
{ .compatible = "renesas,gpio-r8a77965" },
{ .compatible = "renesas,gpio-r8a77970" },
{ .compatible = "renesas,gpio-r8a77995" },
{ .compatible = "renesas,rcar-gen2-gpio" },
{ .compatible = "renesas,rcar-gen3-gpio" },
{ /* sentinel */ }
};
U_BOOT_DRIVER(rcar_gpio) = {
.name = "rcar-gpio",
.id = UCLASS_GPIO,
.of_match = rcar_gpio_ids,
.ops = &rcar_gpio_ops,
.priv_auto_alloc_size = sizeof(struct rcar_gpio_priv),
.probe = rcar_gpio_probe,
};