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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2019 Marek Vasut <marek.vasut@gmail.com>
*/
#include <common.h>
#include <clk.h>
#include <dm.h>
#include <errno.h>
#include <asm/global_data.h>
#include <asm/gpio.h>
#include <asm/io.h>
#include <linux/bitops.h>
#define P(bank) (0x0000 + (bank) * 4)
#define PSR(bank) (0x0100 + (bank) * 4)
#define PPR(bank) (0x0200 + (bank) * 4)
#define PM(bank) (0x0300 + (bank) * 4)
#define PMC(bank) (0x0400 + (bank) * 4)
#define PFC(bank) (0x0500 + (bank) * 4)
#define PFCE(bank) (0x0600 + (bank) * 4)
#define PNOT(bank) (0x0700 + (bank) * 4)
#define PMSR(bank) (0x0800 + (bank) * 4)
#define PMCSR(bank) (0x0900 + (bank) * 4)
#define PFCAE(bank) (0x0A00 + (bank) * 4)
#define PIBC(bank) (0x4000 + (bank) * 4)
#define PBDC(bank) (0x4100 + (bank) * 4)
#define PIPC(bank) (0x4200 + (bank) * 4)
#define RZA1_MAX_GPIO_PER_BANK 16
DECLARE_GLOBAL_DATA_PTR;
struct r7s72100_gpio_priv {
void __iomem *regs;
int bank;
};
static int r7s72100_gpio_get_value(struct udevice *dev, unsigned offset)
{
struct r7s72100_gpio_priv *priv = dev_get_priv(dev);
return !!(readw(priv->regs + PPR(priv->bank)) & BIT(offset));
}
static int r7s72100_gpio_set_value(struct udevice *dev, unsigned line,
int value)
{
struct r7s72100_gpio_priv *priv = dev_get_priv(dev);
writel(BIT(line + 16) | (value ? BIT(line) : 0),
priv->regs + PSR(priv->bank));
return 0;
}
static void r7s72100_gpio_set_direction(struct udevice *dev, unsigned line,
bool output)
{
struct r7s72100_gpio_priv *priv = dev_get_priv(dev);
writel(BIT(line + 16), priv->regs + PMCSR(priv->bank));
writel(BIT(line + 16) | (output ? 0 : BIT(line)),
priv->regs + PMSR(priv->bank));
clrsetbits_le16(priv->regs + PIBC(priv->bank), BIT(line),
output ? 0 : BIT(line));
}
static int r7s72100_gpio_direction_input(struct udevice *dev, unsigned offset)
{
r7s72100_gpio_set_direction(dev, offset, false);
return 0;
}
static int r7s72100_gpio_direction_output(struct udevice *dev, unsigned offset,
int value)
{
/* write GPIO value to output before selecting output mode of pin */
r7s72100_gpio_set_value(dev, offset, value);
r7s72100_gpio_set_direction(dev, offset, true);
return 0;
}
static int r7s72100_gpio_get_function(struct udevice *dev, unsigned offset)
{
struct r7s72100_gpio_priv *priv = dev_get_priv(dev);
if (readw(priv->regs + PM(priv->bank)) & BIT(offset))
return GPIOF_INPUT;
else
return GPIOF_OUTPUT;
}
static const struct dm_gpio_ops r7s72100_gpio_ops = {
.direction_input = r7s72100_gpio_direction_input,
.direction_output = r7s72100_gpio_direction_output,
.get_value = r7s72100_gpio_get_value,
.set_value = r7s72100_gpio_set_value,
.get_function = r7s72100_gpio_get_function,
};
static int r7s72100_gpio_probe(struct udevice *dev)
{
struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
struct r7s72100_gpio_priv *priv = dev_get_priv(dev);
struct fdtdec_phandle_args args;
int node = dev_of_offset(dev);
int ret;
fdt_addr_t addr_base;
uc_priv->bank_name = dev->name;
dev = dev_get_parent(dev);
addr_base = dev_read_addr(dev);
if (addr_base == FDT_ADDR_T_NONE)
return -EINVAL;
priv->regs = (void __iomem *)addr_base;
ret = fdtdec_parse_phandle_with_args(gd->fdt_blob, node, "gpio-ranges",
NULL, 3, 0, &args);
priv->bank = ret == 0 ? (args.args[1] / RZA1_MAX_GPIO_PER_BANK) : -1;
uc_priv->gpio_count = ret == 0 ? args.args[2] : RZA1_MAX_GPIO_PER_BANK;
return 0;
}
U_BOOT_DRIVER(r7s72100_gpio) = {
.name = "r7s72100-gpio",
.id = UCLASS_GPIO,
.ops = &r7s72100_gpio_ops,
.priv_auto = sizeof(struct r7s72100_gpio_priv),
.probe = r7s72100_gpio_probe,
};
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