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/*
* $Id$
*
* ADM5120 GPIO support
*
* Copyright (C) 2007 OpenWrt.org
* Copyright (C) 2007 Gabor Juhos <juhosg@freemail.hu>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the
* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#include <linux/autoconf.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <asm/addrspace.h>
#include <asm/io.h>
#include <asm/gpio.h>
#include <asm/mach-adm5120/adm5120_defs.h>
#include <asm/mach-adm5120/adm5120_info.h>
#include <asm/mach-adm5120/adm5120_switch.h>
typedef void __iomem * gpio_reg_t;
#define GPIO_READ(r) readl((r))
#define GPIO_WRITE(v,r) writel((v),(r))
#define GPIO_REG(r) (gpio_reg_t)(KSEG1ADDR(ADM5120_SWITCH_BASE)+r)
struct adm5120_gpio_line {
u32 flags;
const char *label;
};
#define GPIO_FLAG_VALID 0x01
#define GPIO_FLAG_USED 0x02
struct led_desc {
gpio_reg_t reg; /* LED register address */
u8 iv_shift; /* shift amount for input bit */
u8 mode_shift; /* shift amount for mode bits */
};
#define LED_DESC(_port,_led) { \
.reg = GPIO_REG(SWITCH_REG_PORT0_LED+_port*4), \
.iv_shift = LED0_IV_SHIFT+_led, \
.mode_shift = _led*4 \
}
static struct led_desc led_table[15] = {
LED_DESC(0, 0), LED_DESC(0, 1), LED_DESC(0, 2),
LED_DESC(1, 0), LED_DESC(1, 1), LED_DESC(1, 2),
LED_DESC(2, 0), LED_DESC(2, 1), LED_DESC(2, 2),
LED_DESC(3, 0), LED_DESC(3, 1), LED_DESC(3, 2),
LED_DESC(4, 0), LED_DESC(4, 1), LED_DESC(4, 2)
};
static struct adm5120_gpio_line adm5120_gpio_map[ADM5120_GPIO_COUNT] = {
[ADM5120_GPIO_PIN0] = {.flags = GPIO_FLAG_VALID},
[ADM5120_GPIO_PIN1] = {.flags = GPIO_FLAG_VALID},
[ADM5120_GPIO_PIN2] = {.flags = GPIO_FLAG_VALID},
[ADM5120_GPIO_PIN3] = {.flags = GPIO_FLAG_VALID},
[ADM5120_GPIO_PIN4] = {.flags = GPIO_FLAG_VALID},
[ADM5120_GPIO_PIN5] = {.flags = GPIO_FLAG_VALID},
[ADM5120_GPIO_PIN6] = {.flags = GPIO_FLAG_VALID},
[ADM5120_GPIO_PIN7] = {.flags = GPIO_FLAG_VALID},
[ADM5120_GPIO_P0L0] = {.flags = GPIO_FLAG_VALID},
[ADM5120_GPIO_P0L1] = {.flags = GPIO_FLAG_VALID},
[ADM5120_GPIO_P0L2] = {.flags = GPIO_FLAG_VALID},
[ADM5120_GPIO_P1L0] = {.flags = GPIO_FLAG_VALID},
[ADM5120_GPIO_P1L1] = {.flags = GPIO_FLAG_VALID},
[ADM5120_GPIO_P1L2] = {.flags = GPIO_FLAG_VALID},
[ADM5120_GPIO_P2L0] = {.flags = GPIO_FLAG_VALID},
[ADM5120_GPIO_P2L1] = {.flags = GPIO_FLAG_VALID},
[ADM5120_GPIO_P2L2] = {.flags = GPIO_FLAG_VALID},
[ADM5120_GPIO_P3L0] = {.flags = GPIO_FLAG_VALID},
[ADM5120_GPIO_P3L1] = {.flags = GPIO_FLAG_VALID},
[ADM5120_GPIO_P3L2] = {.flags = GPIO_FLAG_VALID},
[ADM5120_GPIO_P4L0] = {.flags = GPIO_FLAG_VALID},
[ADM5120_GPIO_P4L1] = {.flags = GPIO_FLAG_VALID},
[ADM5120_GPIO_P4L2] = {.flags = GPIO_FLAG_VALID}
};
#define gpio_is_invalid(g) ( \
(g) > ADM5120_GPIO_MAX || \
((adm5120_gpio_map[(g)].flags & GPIO_FLAG_VALID) == 0) \
)
#define gpio_is_used(g) ((adm5120_gpio_map[(g)].flags & GPIO_FLAG_USED) != 0)
/*
* 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)
static inline int pins_direction_input(unsigned pin)
{
gpio_reg_t *reg;
u32 t;
reg = GPIO_REG(SWITCH_REG_GPIO_CONF0);
t = GPIO_READ(reg);
t &= ~(PIN_OE(pin));
t |= PIN_IM(pin);
GPIO_WRITE(t,reg);
return 0;
}
static inline int pins_direction_output(unsigned pin, int value)
{
gpio_reg_t *reg;
u32 t;
reg = GPIO_REG(SWITCH_REG_GPIO_CONF0);
t = GPIO_READ(reg);
t &= ~(PIN_IM(pin) | PIN_OV(pin));
t |= PIN_OE(pin);
if (value)
t |= PIN_OV(pin);
GPIO_WRITE(t,reg);
return 0;
}
static inline int pins_get_value(unsigned pin)
{
gpio_reg_t *reg;
u32 t;
reg = GPIO_REG(SWITCH_REG_GPIO_CONF0);
t = GPIO_READ(reg);
if ((t & PIN_IM(pin)) != 0)
t &= PIN_IV(pin);
else
t &= PIN_OV(pin);
return (t) ? 1 : 0;
}
static inline void pins_set_value(unsigned pin, int value)
{
gpio_reg_t *reg;
u32 t;
reg = GPIO_REG(SWITCH_REG_GPIO_CONF0);
t = GPIO_READ(reg);
if (value == 0)
t &= ~(PIN_OV(pin));
else
t |= PIN_OV(pin);
GPIO_WRITE(t,reg);
}
/*
* Helpers for GPIO lines in PORTx_LED registers
*/
static inline int leds_direction_input(unsigned led)
{
gpio_reg_t *reg;
u32 t;
reg = led_table[led].reg;
t = GPIO_READ(reg);
t &= ~(LED_MODE_MASK << led_table[led].mode_shift);
GPIO_WRITE(t,reg);
return 0;
}
static inline int leds_direction_output(unsigned led, int value)
{
gpio_reg_t *reg;
u32 t, s;
reg = led_table[led].reg;
s = led_table[led].mode_shift;
t = GPIO_READ(reg);
t &= ~(LED_MODE_MASK << s);
if (value)
t |= (LED_MODE_OUT_HIGH << s);
else
t |= (LED_MODE_OUT_LOW << s);
GPIO_WRITE(t,reg);
return 0;
}
static inline int leds_get_value(unsigned led)
{
gpio_reg_t *reg;
u32 t, m;
reg = led_table[led].reg;
t = GPIO_READ(reg);
m = (t >> led_table[led].mode_shift) & LED_MODE_MASK;
if (m == LED_MODE_INPUT)
return (t >> led_table[led].iv_shift) & 1;
if (m == LED_MODE_OUT_LOW)
return 0;
return 1;
}
static inline void leds_set_value(unsigned led, int value)
{
gpio_reg_t *reg;
u32 s,t;
reg = led_table[led].reg;
s = led_table[led].mode_shift;
t = GPIO_READ(reg);
t &= ~(LED_MODE_MASK << s);
if (value)
t |= (LED_MODE_OUT_HIGH << s);
else
t |= (LED_MODE_OUT_LOW << s);
GPIO_WRITE(t,reg);
}
/*
* Main GPIO support routines
*/
int adm5120_gpio_direction_input(unsigned gpio)
{
if (gpio_is_invalid(gpio))
return -EINVAL;
if (gpio < ADM5120_GPIO_P0L0)
return pins_direction_input(gpio);
gpio -= ADM5120_GPIO_P0L0;
return leds_direction_input(gpio);
}
int adm5120_gpio_direction_output(unsigned gpio, int value)
{
if (gpio_is_invalid(gpio))
return -EINVAL;
if (gpio < ADM5120_GPIO_P0L0)
return pins_direction_output(gpio, value);
gpio -= ADM5120_GPIO_P0L0;
return leds_direction_output(gpio, value);
}
int adm5120_gpio_get_value(unsigned gpio)
{
if (gpio < ADM5120_GPIO_P0L0)
return pins_get_value(gpio);
gpio -= ADM5120_GPIO_P0L0;
return leds_get_value(gpio);
}
void adm5120_gpio_set_value(unsigned gpio, int value)
{
if (gpio < ADM5120_GPIO_P0L0) {
pins_set_value(gpio, value);
return;
}
gpio -= ADM5120_GPIO_P0L0;
leds_set_value(gpio, value);
}
int adm5120_gpio_request(unsigned gpio, const char *label)
{
if (gpio_is_invalid(gpio))
return -EINVAL;
if (gpio_is_used(gpio))
return -EBUSY;
adm5120_gpio_map[gpio].flags |= GPIO_FLAG_USED;
adm5120_gpio_map[gpio].label = label;
return 0;
}
void adm5120_gpio_free(unsigned gpio)
{
if (gpio_is_invalid(gpio))
return;
adm5120_gpio_map[gpio].flags &= ~GPIO_FLAG_USED;
adm5120_gpio_map[gpio].label = NULL;
}
int adm5120_gpio_to_irq(unsigned gpio)
{
/* FIXME: not yet implemented */
return -EINVAL;
}
int adm5120_irq_to_gpio(unsigned irq)
{
/* FIXME: not yet implemented */
return -EINVAL;
}
static int __init adm5120_gpio_init(void)
{
int i;
if (adm5120_package_pqfp()) {
/* GPIO pins 4-7 are unavailable in ADM5120P */
for (i=ADM5120_GPIO_PIN4; i<=ADM5120_GPIO_PIN7; i++)
adm5120_gpio_map[i].flags &= ~GPIO_FLAG_VALID;
}
return 0;
}
subsys_initcall(adm5120_gpio_init);
EXPORT_SYMBOL(adm5120_gpio_direction_output);
EXPORT_SYMBOL(adm5120_gpio_direction_input);
EXPORT_SYMBOL(adm5120_gpio_get_value);
EXPORT_SYMBOL(adm5120_gpio_set_value);
EXPORT_SYMBOL(adm5120_gpio_request);
EXPORT_SYMBOL(adm5120_gpio_free);
EXPORT_SYMBOL(adm5120_gpio_to_irq);
EXPORT_SYMBOL(adm5120_irq_to_gpio);
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