OpenWrt – Rev 1
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/*
* ADM5120 generic GPIO API support via GPIOLIB
*
* Copyright (C) 2007-2008 Gabor Juhos <juhosg@openwrt.org>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*
*/
#include <linux/init.h>
#include <linux/types.h>
#include <linux/module.h>
#include <linux/irq.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/gpio.h>
#include <asm/addrspace.h>
#include <asm/mach-adm5120/adm5120_defs.h>
#include <asm/mach-adm5120/adm5120_info.h>
#include <asm/mach-adm5120/adm5120_switch.h>
#define GPIO_REG(r) (void __iomem *)(KSEG1ADDR(ADM5120_SWITCH_BASE) + r)
struct gpio1_desc {
void __iomem *reg; /* register address */
u8 iv_shift; /* shift amount for input bit */
u8 mode_shift; /* shift amount for mode bits */
};
#define GPIO1_DESC(p, l) { \
.reg = GPIO_REG(SWITCH_REG_PORT0_LED + ((p) * 4)), \
.iv_shift = LED0_IV_SHIFT + (l), \
.mode_shift = (l) * 4 \
}
static struct gpio1_desc gpio1_table[15] = {
GPIO1_DESC(0, 0), GPIO1_DESC(0, 1), GPIO1_DESC(0, 2),
GPIO1_DESC(1, 0), GPIO1_DESC(1, 1), GPIO1_DESC(1, 2),
GPIO1_DESC(2, 0), GPIO1_DESC(2, 1), GPIO1_DESC(2, 2),
GPIO1_DESC(3, 0), GPIO1_DESC(3, 1), GPIO1_DESC(3, 2),
GPIO1_DESC(4, 0), GPIO1_DESC(4, 1), GPIO1_DESC(4, 2)
};
static u32 gpio_conf2;
int adm5120_gpio_to_irq(unsigned gpio)
{
int ret;
switch (gpio) {
case ADM5120_GPIO_PIN2:
ret = ADM5120_IRQ_GPIO2;
break;
case ADM5120_GPIO_PIN4:
ret = ADM5120_IRQ_GPIO4;
break;
default:
ret = -EINVAL;
break;
}
return ret;
}
EXPORT_SYMBOL(adm5120_gpio_to_irq);
int adm5120_irq_to_gpio(unsigned irq)
{
int ret;
switch (irq) {
case ADM5120_IRQ_GPIO2:
ret = ADM5120_GPIO_PIN2;
break;
case ADM5120_IRQ_GPIO4:
ret = ADM5120_GPIO_PIN4;
break;
default:
ret = -EINVAL;
break;
}
return ret;
}
EXPORT_SYMBOL(adm5120_irq_to_gpio);
/*
* Helpers for GPIO lines in GPIO_CONF0 register
*/
#define PIN_IM(p) ((1 << GPIO_CONF0_IM_SHIFT) << p)
#define PIN_IV(p) ((1 << GPIO_CONF0_IV_SHIFT) << p)
#define PIN_OE(p) ((1 << GPIO_CONF0_OE_SHIFT) << p)
#define PIN_OV(p) ((1 << GPIO_CONF0_OV_SHIFT) << p)
int __adm5120_gpio0_get_value(unsigned offset)
{
void __iomem **reg;
u32 t;
reg = GPIO_REG(SWITCH_REG_GPIO_CONF0);
t = __raw_readl(reg);
if ((t & PIN_IM(offset)) != 0)
t &= PIN_IV(offset);
else
t &= PIN_OV(offset);
return (t) ? 1 : 0;
}
EXPORT_SYMBOL(__adm5120_gpio0_get_value);
void __adm5120_gpio0_set_value(unsigned offset, int value)
{
void __iomem **reg;
u32 t;
reg = GPIO_REG(SWITCH_REG_GPIO_CONF0);
t = __raw_readl(reg);
if (value == 0)
t &= ~(PIN_OV(offset));
else
t |= PIN_OV(offset);
__raw_writel(t, reg);
}
EXPORT_SYMBOL(__adm5120_gpio0_set_value);
static int adm5120_gpio0_get_value(struct gpio_chip *chip, unsigned offset)
{
return __adm5120_gpio0_get_value(offset);
}
static void adm5120_gpio0_set_value(struct gpio_chip *chip,
unsigned offset, int value)
{
__adm5120_gpio0_set_value(offset, value);
}
static int adm5120_gpio0_direction_input(struct gpio_chip *chip,
unsigned offset)
{
void __iomem **reg;
u32 t;
reg = GPIO_REG(SWITCH_REG_GPIO_CONF0);
t = __raw_readl(reg);
t &= ~(PIN_OE(offset));
t |= PIN_IM(offset);
__raw_writel(t, reg);
return 0;
}
static int adm5120_gpio0_direction_output(struct gpio_chip *chip,
unsigned offset, int value)
{
void __iomem **reg;
u32 t;
reg = GPIO_REG(SWITCH_REG_GPIO_CONF0);
t = __raw_readl(reg);
t &= ~(PIN_IM(offset) | PIN_OV(offset));
t |= PIN_OE(offset);
if (value)
t |= PIN_OV(offset);
__raw_writel(t, reg);
return 0;
}
static struct gpio_chip adm5120_gpio0_chip = {
.label = "adm5120 gpio0",
.get = adm5120_gpio0_get_value,
.set = adm5120_gpio0_set_value,
.direction_input = adm5120_gpio0_direction_input,
.direction_output = adm5120_gpio0_direction_output,
.base = ADM5120_GPIO_PIN0,
.ngpio = ADM5120_GPIO_PIN7 - ADM5120_GPIO_PIN0 + 1,
};
int __adm5120_gpio1_get_value(unsigned offset)
{
void __iomem **reg;
u32 t, m;
reg = gpio1_table[offset].reg;
t = __raw_readl(reg);
m = (t >> gpio1_table[offset].mode_shift) & LED_MODE_MASK;
if (m == LED_MODE_INPUT)
return (t >> gpio1_table[offset].iv_shift) & 1;
if (m == LED_MODE_OUT_LOW)
return 0;
return 1;
}
EXPORT_SYMBOL(__adm5120_gpio1_get_value);
void __adm5120_gpio1_set_value(unsigned offset, int value)
{
void __iomem **reg;
u32 t, s;
reg = gpio1_table[offset].reg;
s = gpio1_table[offset].mode_shift;
t = __raw_readl(reg);
t &= ~(LED_MODE_MASK << s);
switch (value) {
case ADM5120_GPIO_LOW:
t |= (LED_MODE_OUT_LOW << s);
break;
case ADM5120_GPIO_FLASH:
case ADM5120_GPIO_LINK:
case ADM5120_GPIO_SPEED:
case ADM5120_GPIO_DUPLEX:
case ADM5120_GPIO_ACT:
case ADM5120_GPIO_COLL:
case ADM5120_GPIO_LINK_ACT:
case ADM5120_GPIO_DUPLEX_COLL:
case ADM5120_GPIO_10M_ACT:
case ADM5120_GPIO_100M_ACT:
t |= ((value & LED_MODE_MASK) << s);
break;
default:
t |= (LED_MODE_OUT_HIGH << s);
break;
}
__raw_writel(t, reg);
}
EXPORT_SYMBOL(__adm5120_gpio1_set_value);
static int adm5120_gpio1_get_value(struct gpio_chip *chip, unsigned offset)
{
return __adm5120_gpio1_get_value(offset);
}
static void adm5120_gpio1_set_value(struct gpio_chip *chip,
unsigned offset, int value)
{
__adm5120_gpio1_set_value(offset, value);
}
static int adm5120_gpio1_direction_input(struct gpio_chip *chip,
unsigned offset)
{
void __iomem **reg;
u32 t;
reg = gpio1_table[offset].reg;
t = __raw_readl(reg);
t &= ~(LED_MODE_MASK << gpio1_table[offset].mode_shift);
__raw_writel(t, reg);
return 0;
}
static int adm5120_gpio1_direction_output(struct gpio_chip *chip,
unsigned offset, int value)
{
__adm5120_gpio1_set_value(offset, value);
return 0;
}
static struct gpio_chip adm5120_gpio1_chip = {
.label = "adm5120 gpio1",
.get = adm5120_gpio1_get_value,
.set = adm5120_gpio1_set_value,
.direction_input = adm5120_gpio1_direction_input,
.direction_output = adm5120_gpio1_direction_output,
.base = ADM5120_GPIO_P0L0,
.ngpio = ADM5120_GPIO_P4L2 - ADM5120_GPIO_P0L0 + 1,
};
void __init adm5120_gpio_csx0_enable(void)
{
gpio_conf2 |= GPIO_CONF2_CSX0;
SW_WRITE_REG(SWITCH_REG_GPIO_CONF2, gpio_conf2);
gpio_request(ADM5120_GPIO_PIN1, "CSX0");
}
void __init adm5120_gpio_csx1_enable(void)
{
gpio_conf2 |= GPIO_CONF2_CSX1;
SW_WRITE_REG(SWITCH_REG_GPIO_CONF2, gpio_conf2);
gpio_request(ADM5120_GPIO_PIN3, "CSX1");
}
void __init adm5120_gpio_ew_enable(void)
{
gpio_conf2 |= GPIO_CONF2_EW;
SW_WRITE_REG(SWITCH_REG_GPIO_CONF2, gpio_conf2);
gpio_request(ADM5120_GPIO_PIN0, "EW");
}
void __init adm5120_gpio_init(void)
{
int err;
SW_WRITE_REG(SWITCH_REG_GPIO_CONF2, gpio_conf2);
if (adm5120_package_pqfp())
adm5120_gpio0_chip.ngpio = 4;
err = gpiochip_add(&adm5120_gpio0_chip);
if (err)
panic("cannot add ADM5120 GPIO0 chip, error=%d", err);
err = gpiochip_add(&adm5120_gpio1_chip);
if (err)
panic("cannot add ADM5120 GPIO1 chip, error=%d", err);
}