You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
158 lines
4.2 KiB
158 lines
4.2 KiB
/*
|
|
* GPIOLIB interface for BF538/9 PORT C, D, and E GPIOs
|
|
*
|
|
* Copyright 2009-2011 Analog Devices Inc.
|
|
*
|
|
* Licensed under the GPL-2 or later.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/err.h>
|
|
#include <linux/gpio.h>
|
|
#include <asm/blackfin.h>
|
|
#include <asm/portmux.h>
|
|
|
|
#define DEFINE_REG(reg, off) \
|
|
static inline u16 read_##reg(void __iomem *port) \
|
|
{ return bfin_read16(port + off); } \
|
|
static inline void write_##reg(void __iomem *port, u16 v) \
|
|
{ bfin_write16(port + off, v); }
|
|
|
|
DEFINE_REG(PORTIO, 0x00)
|
|
DEFINE_REG(PORTIO_CLEAR, 0x10)
|
|
DEFINE_REG(PORTIO_SET, 0x20)
|
|
DEFINE_REG(PORTIO_DIR, 0x40)
|
|
DEFINE_REG(PORTIO_INEN, 0x50)
|
|
|
|
static void __iomem *gpio_chip_to_mmr(struct gpio_chip *chip)
|
|
{
|
|
switch (chip->base) {
|
|
default: /* not really needed, but keeps gcc happy */
|
|
case GPIO_PC0: return (void __iomem *)PORTCIO;
|
|
case GPIO_PD0: return (void __iomem *)PORTDIO;
|
|
case GPIO_PE0: return (void __iomem *)PORTEIO;
|
|
}
|
|
}
|
|
|
|
static int bf538_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
|
|
{
|
|
void __iomem *port = gpio_chip_to_mmr(chip);
|
|
return !!(read_PORTIO(port) & (1u << gpio));
|
|
}
|
|
|
|
static void bf538_gpio_set_value(struct gpio_chip *chip, unsigned gpio, int value)
|
|
{
|
|
void __iomem *port = gpio_chip_to_mmr(chip);
|
|
if (value)
|
|
write_PORTIO_SET(port, (1u << gpio));
|
|
else
|
|
write_PORTIO_CLEAR(port, (1u << gpio));
|
|
}
|
|
|
|
static int bf538_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
|
|
{
|
|
void __iomem *port = gpio_chip_to_mmr(chip);
|
|
write_PORTIO_DIR(port, read_PORTIO_DIR(port) & ~(1u << gpio));
|
|
write_PORTIO_INEN(port, read_PORTIO_INEN(port) | (1u << gpio));
|
|
return 0;
|
|
}
|
|
|
|
static int bf538_gpio_direction_output(struct gpio_chip *chip, unsigned gpio, int value)
|
|
{
|
|
void __iomem *port = gpio_chip_to_mmr(chip);
|
|
write_PORTIO_INEN(port, read_PORTIO_INEN(port) & ~(1u << gpio));
|
|
bf538_gpio_set_value(port, gpio, value);
|
|
write_PORTIO_DIR(port, read_PORTIO_DIR(port) | (1u << gpio));
|
|
return 0;
|
|
}
|
|
|
|
static int bf538_gpio_request(struct gpio_chip *chip, unsigned gpio)
|
|
{
|
|
return bfin_special_gpio_request(chip->base + gpio, chip->label);
|
|
}
|
|
|
|
static void bf538_gpio_free(struct gpio_chip *chip, unsigned gpio)
|
|
{
|
|
return bfin_special_gpio_free(chip->base + gpio);
|
|
}
|
|
|
|
/* We don't set the irq fields as these banks cannot generate interrupts */
|
|
|
|
static struct gpio_chip bf538_portc_chip = {
|
|
.label = "GPIO-PC",
|
|
.direction_input = bf538_gpio_direction_input,
|
|
.get = bf538_gpio_get_value,
|
|
.direction_output = bf538_gpio_direction_output,
|
|
.set = bf538_gpio_set_value,
|
|
.request = bf538_gpio_request,
|
|
.free = bf538_gpio_free,
|
|
.base = GPIO_PC0,
|
|
.ngpio = GPIO_PC9 - GPIO_PC0 + 1,
|
|
};
|
|
|
|
static struct gpio_chip bf538_portd_chip = {
|
|
.label = "GPIO-PD",
|
|
.direction_input = bf538_gpio_direction_input,
|
|
.get = bf538_gpio_get_value,
|
|
.direction_output = bf538_gpio_direction_output,
|
|
.set = bf538_gpio_set_value,
|
|
.request = bf538_gpio_request,
|
|
.free = bf538_gpio_free,
|
|
.base = GPIO_PD0,
|
|
.ngpio = GPIO_PD13 - GPIO_PD0 + 1,
|
|
};
|
|
|
|
static struct gpio_chip bf538_porte_chip = {
|
|
.label = "GPIO-PE",
|
|
.direction_input = bf538_gpio_direction_input,
|
|
.get = bf538_gpio_get_value,
|
|
.direction_output = bf538_gpio_direction_output,
|
|
.set = bf538_gpio_set_value,
|
|
.request = bf538_gpio_request,
|
|
.free = bf538_gpio_free,
|
|
.base = GPIO_PE0,
|
|
.ngpio = GPIO_PE15 - GPIO_PE0 + 1,
|
|
};
|
|
|
|
static int __init bf538_extgpio_setup(void)
|
|
{
|
|
return gpiochip_add_data(&bf538_portc_chip, NULL) |
|
|
gpiochip_add_data(&bf538_portd_chip, NULL) |
|
|
gpiochip_add_data(&bf538_porte_chip, NULL);
|
|
}
|
|
arch_initcall(bf538_extgpio_setup);
|
|
|
|
#ifdef CONFIG_PM
|
|
static struct {
|
|
u16 data, dir, inen;
|
|
} gpio_bank_saved[3];
|
|
|
|
static void __iomem * const port_bases[3] = {
|
|
(void *)PORTCIO,
|
|
(void *)PORTDIO,
|
|
(void *)PORTEIO,
|
|
};
|
|
|
|
void bfin_special_gpio_pm_hibernate_suspend(void)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(port_bases); ++i) {
|
|
gpio_bank_saved[i].data = read_PORTIO(port_bases[i]);
|
|
gpio_bank_saved[i].inen = read_PORTIO_INEN(port_bases[i]);
|
|
gpio_bank_saved[i].dir = read_PORTIO_DIR(port_bases[i]);
|
|
}
|
|
}
|
|
|
|
void bfin_special_gpio_pm_hibernate_restore(void)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(port_bases); ++i) {
|
|
write_PORTIO_INEN(port_bases[i], gpio_bank_saved[i].inen);
|
|
write_PORTIO_SET(port_bases[i],
|
|
gpio_bank_saved[i].data & gpio_bank_saved[i].dir);
|
|
write_PORTIO_DIR(port_bases[i], gpio_bank_saved[i].dir);
|
|
}
|
|
}
|
|
#endif
|
|
|