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/*
* (C) Copyright 2016
* Mario Six, Guntermann & Drunck GmbH, six@gdsys.de
*
* based on arch/powerpc/include/asm/mpc85xx_gpio.h, which is
*
* Copyright 2010 eXMeritus, A Boeing Company
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <dm.h>
#include <asm/gpio.h>
#include <mapmem.h>
DECLARE_GLOBAL_DATA_PTR;
struct ccsr_gpio {
u32 gpdir;
u32 gpodr;
u32 gpdat;
u32 gpier;
u32 gpimr;
u32 gpicr;
};
struct mpc85xx_gpio_data {
/* The bank's register base in memory */
struct ccsr_gpio __iomem *base;
/* The address of the registers; used to identify the bank */
ulong addr;
/* The GPIO count of the bank */
uint gpio_count;
/* The GPDAT register cannot be used to determine the value of output
* pins on MPC8572/MPC8536, so we shadow it and use the shadowed value
* for output pins */
u32 dat_shadow;
};
inline u32 gpio_mask(unsigned gpio) {
return (1U << (31 - (gpio)));
}
static inline u32 mpc85xx_gpio_get_val(struct ccsr_gpio *base, u32 mask)
{
return in_be32(&base->gpdat) & mask;
}
static inline u32 mpc85xx_gpio_get_dir(struct ccsr_gpio *base, u32 mask)
{
return in_be32(&base->gpdir) & mask;
}
static inline void mpc85xx_gpio_set_in(struct ccsr_gpio *base, u32 gpios)
{
clrbits_be32(&base->gpdat, gpios);
/* GPDIR register 0 -> input */
clrbits_be32(&base->gpdir, gpios);
}
static inline void mpc85xx_gpio_set_low(struct ccsr_gpio *base, u32 gpios)
{
clrbits_be32(&base->gpdat, gpios);
/* GPDIR register 1 -> output */
setbits_be32(&base->gpdir, gpios);
}
static inline void mpc85xx_gpio_set_high(struct ccsr_gpio *base, u32 gpios)
{
setbits_be32(&base->gpdat, gpios);
/* GPDIR register 1 -> output */
setbits_be32(&base->gpdir, gpios);
}
static int mpc85xx_gpio_direction_input(struct udevice *dev, unsigned gpio)
{
struct mpc85xx_gpio_data *data = dev_get_priv(dev);
mpc85xx_gpio_set_in(data->base, gpio_mask(gpio));
return 0;
}
static int mpc85xx_gpio_set_value(struct udevice *dev, unsigned gpio,
int value)
{
struct mpc85xx_gpio_data *data = dev_get_priv(dev);
if (value) {
data->dat_shadow |= gpio_mask(gpio);
mpc85xx_gpio_set_high(data->base, gpio_mask(gpio));
} else {
data->dat_shadow &= ~gpio_mask(gpio);
mpc85xx_gpio_set_low(data->base, gpio_mask(gpio));
}
return 0;
}
static int mpc85xx_gpio_direction_output(struct udevice *dev, unsigned gpio,
int value)
{
return mpc85xx_gpio_set_value(dev, gpio, value);
}
static int mpc85xx_gpio_get_value(struct udevice *dev, unsigned gpio)
{
struct mpc85xx_gpio_data *data = dev_get_priv(dev);
if (!!mpc85xx_gpio_get_dir(data->base, gpio_mask(gpio))) {
/* Output -> use shadowed value */
return !!(data->dat_shadow & gpio_mask(gpio));
} else {
/* Input -> read value from GPDAT register */
return !!mpc85xx_gpio_get_val(data->base, gpio_mask(gpio));
}
}
static int mpc85xx_gpio_get_function(struct udevice *dev, unsigned gpio)
{
struct mpc85xx_gpio_data *data = dev_get_priv(dev);
int dir;
dir = !!mpc85xx_gpio_get_dir(data->base, gpio_mask(gpio));
return dir ? GPIOF_OUTPUT : GPIOF_INPUT;
}
static int mpc85xx_gpio_ofdata_to_platdata(struct udevice *dev) {
struct mpc85xx_gpio_data *data = dev_get_priv(dev);
fdt_addr_t addr;
fdt_size_t size;
addr = fdtdec_get_addr_size_auto_noparent(gd->fdt_blob, dev->of_offset,
"reg", 0, &size);
data->addr = addr;
data->base = map_sysmem(CONFIG_SYS_IMMR + addr, size);
if (!data->base)
return -ENOMEM;
data->gpio_count = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
"ngpios", 32);
data->dat_shadow = 0;
return 0;
}
static int mpc85xx_gpio_probe(struct udevice *dev)
{
struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
struct mpc85xx_gpio_data *data = dev_get_priv(dev);
char name[32], *str;
snprintf(name, sizeof(name), "MPC@%lx_", data->addr);
str = strdup(name);
if (!str)
return -ENOMEM;
uc_priv->bank_name = str;
uc_priv->gpio_count = data->gpio_count;
return 0;
}
static const struct dm_gpio_ops gpio_mpc85xx_ops = {
.direction_input = mpc85xx_gpio_direction_input,
.direction_output = mpc85xx_gpio_direction_output,
.get_value = mpc85xx_gpio_get_value,
.set_value = mpc85xx_gpio_set_value,
.get_function = mpc85xx_gpio_get_function,
};
static const struct udevice_id mpc85xx_gpio_ids[] = {
{ .compatible = "fsl,pq3-gpio" },
{ /* sentinel */ }
};
U_BOOT_DRIVER(gpio_mpc85xx) = {
.name = "gpio_mpc85xx",
.id = UCLASS_GPIO,
.ops = &gpio_mpc85xx_ops,
.ofdata_to_platdata = mpc85xx_gpio_ofdata_to_platdata,
.of_match = mpc85xx_gpio_ids,
.probe = mpc85xx_gpio_probe,
.priv_auto_alloc_size = sizeof(struct mpc85xx_gpio_data),
};
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