altera_pio.c
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/*
* Copyright (C) 2015 Thomas Chou <thomas@wytron.com.tw>
* Copyright (C) 2011 Missing Link Electronics
* Joachim Foerster <joachim@missinglinkelectronics.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <malloc.h>
#include <fdtdec.h>
#include <asm/io.h>
#include <asm/gpio.h>
DECLARE_GLOBAL_DATA_PTR;
struct altera_pio_regs {
u32 data; /* Data register */
u32 direction; /* Direction register */
};
struct altera_pio_platdata {
struct altera_pio_regs *regs;
int gpio_count;
const char *bank_name;
};
static int altera_pio_direction_input(struct udevice *dev, unsigned pin)
{
struct altera_pio_platdata *plat = dev_get_platdata(dev);
struct altera_pio_regs *const regs = plat->regs;
clrbits_le32(®s->direction, 1 << pin);
return 0;
}
static int altera_pio_direction_output(struct udevice *dev, unsigned pin,
int val)
{
struct altera_pio_platdata *plat = dev_get_platdata(dev);
struct altera_pio_regs *const regs = plat->regs;
if (val)
setbits_le32(®s->data, 1 << pin);
else
clrbits_le32(®s->data, 1 << pin);
/* change the data first, then the direction. to avoid glitch */
setbits_le32(®s->direction, 1 << pin);
return 0;
}
static int altera_pio_get_value(struct udevice *dev, unsigned pin)
{
struct altera_pio_platdata *plat = dev_get_platdata(dev);
struct altera_pio_regs *const regs = plat->regs;
return readl(®s->data) & (1 << pin);
}
static int altera_pio_set_value(struct udevice *dev, unsigned pin, int val)
{
struct altera_pio_platdata *plat = dev_get_platdata(dev);
struct altera_pio_regs *const regs = plat->regs;
if (val)
setbits_le32(®s->data, 1 << pin);
else
clrbits_le32(®s->data, 1 << pin);
return 0;
}
static int altera_pio_probe(struct udevice *dev)
{
struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
struct altera_pio_platdata *plat = dev_get_platdata(dev);
uc_priv->gpio_count = plat->gpio_count;
uc_priv->bank_name = plat->bank_name;
return 0;
}
static int altera_pio_ofdata_to_platdata(struct udevice *dev)
{
struct altera_pio_platdata *plat = dev_get_platdata(dev);
plat->regs = map_physmem(devfdt_get_addr(dev),
sizeof(struct altera_pio_regs),
MAP_NOCACHE);
plat->gpio_count = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
"altr,gpio-bank-width", 32);
plat->bank_name = fdt_getprop(gd->fdt_blob, dev_of_offset(dev),
"gpio-bank-name", NULL);
return 0;
}
static const struct dm_gpio_ops altera_pio_ops = {
.direction_input = altera_pio_direction_input,
.direction_output = altera_pio_direction_output,
.get_value = altera_pio_get_value,
.set_value = altera_pio_set_value,
};
static const struct udevice_id altera_pio_ids[] = {
{ .compatible = "altr,pio-1.0" },
{ }
};
U_BOOT_DRIVER(altera_pio) = {
.name = "altera_pio",
.id = UCLASS_GPIO,
.of_match = altera_pio_ids,
.ops = &altera_pio_ops,
.ofdata_to_platdata = altera_pio_ofdata_to_platdata,
.platdata_auto_alloc_size = sizeof(struct altera_pio_platdata),
.probe = altera_pio_probe,
};