234 строки
6.1 KiB
C
234 строки
6.1 KiB
C
/*
|
|
* linux/arch/arm/mach-msm/gpio.c
|
|
*
|
|
* Copyright (C) 2005 HP Labs
|
|
* Copyright (C) 2008 Google, Inc.
|
|
* Copyright (C) 2009 Pavel Machek <pavel@ucw.cz>
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/io.h>
|
|
#include <linux/irq.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/gpio.h>
|
|
|
|
#include "board-trout.h"
|
|
|
|
static uint8_t trout_int_mask[2] = {
|
|
[0] = 0xff, /* mask all interrupts */
|
|
[1] = 0xff,
|
|
};
|
|
static uint8_t trout_sleep_int_mask[] = {
|
|
[0] = 0xff,
|
|
[1] = 0xff,
|
|
};
|
|
|
|
struct msm_gpio_chip {
|
|
struct gpio_chip chip;
|
|
void __iomem *reg; /* Base of register bank */
|
|
u8 shadow;
|
|
};
|
|
|
|
#define to_msm_gpio_chip(c) container_of(c, struct msm_gpio_chip, chip)
|
|
|
|
static int msm_gpiolib_get(struct gpio_chip *chip, unsigned offset)
|
|
{
|
|
struct msm_gpio_chip *msm_gpio = to_msm_gpio_chip(chip);
|
|
unsigned mask = 1 << offset;
|
|
|
|
return !!(readb(msm_gpio->reg) & mask);
|
|
}
|
|
|
|
static void msm_gpiolib_set(struct gpio_chip *chip, unsigned offset, int val)
|
|
{
|
|
struct msm_gpio_chip *msm_gpio = to_msm_gpio_chip(chip);
|
|
unsigned mask = 1 << offset;
|
|
|
|
if (val)
|
|
msm_gpio->shadow |= mask;
|
|
else
|
|
msm_gpio->shadow &= ~mask;
|
|
|
|
writeb(msm_gpio->shadow, msm_gpio->reg);
|
|
}
|
|
|
|
static int msm_gpiolib_direction_input(struct gpio_chip *chip,
|
|
unsigned offset)
|
|
{
|
|
msm_gpiolib_set(chip, offset, 0);
|
|
return 0;
|
|
}
|
|
|
|
static int msm_gpiolib_direction_output(struct gpio_chip *chip,
|
|
unsigned offset, int val)
|
|
{
|
|
msm_gpiolib_set(chip, offset, val);
|
|
return 0;
|
|
}
|
|
|
|
static int trout_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
|
|
{
|
|
return TROUT_GPIO_TO_INT(offset + chip->base);
|
|
}
|
|
|
|
#define TROUT_GPIO_BANK(name, reg_num, base_gpio, shadow_val) \
|
|
{ \
|
|
.chip = { \
|
|
.label = name, \
|
|
.direction_input = msm_gpiolib_direction_input,\
|
|
.direction_output = msm_gpiolib_direction_output, \
|
|
.get = msm_gpiolib_get, \
|
|
.set = msm_gpiolib_set, \
|
|
.to_irq = trout_gpio_to_irq, \
|
|
.base = base_gpio, \
|
|
.ngpio = 8, \
|
|
}, \
|
|
.reg = (void *) reg_num + TROUT_CPLD_BASE, \
|
|
.shadow = shadow_val, \
|
|
}
|
|
|
|
static struct msm_gpio_chip msm_gpio_banks[] = {
|
|
#if defined(CONFIG_MSM_DEBUG_UART1)
|
|
/* H2W pins <-> UART1 */
|
|
TROUT_GPIO_BANK("MISC2", 0x00, TROUT_GPIO_MISC2_BASE, 0x40),
|
|
#else
|
|
/* H2W pins <-> UART3, Bluetooth <-> UART1 */
|
|
TROUT_GPIO_BANK("MISC2", 0x00, TROUT_GPIO_MISC2_BASE, 0x80),
|
|
#endif
|
|
/* I2C pull */
|
|
TROUT_GPIO_BANK("MISC3", 0x02, TROUT_GPIO_MISC3_BASE, 0x04),
|
|
TROUT_GPIO_BANK("MISC4", 0x04, TROUT_GPIO_MISC4_BASE, 0),
|
|
/* mmdi 32k en */
|
|
TROUT_GPIO_BANK("MISC5", 0x06, TROUT_GPIO_MISC5_BASE, 0x04),
|
|
TROUT_GPIO_BANK("INT2", 0x08, TROUT_GPIO_INT2_BASE, 0),
|
|
TROUT_GPIO_BANK("MISC1", 0x0a, TROUT_GPIO_MISC1_BASE, 0),
|
|
TROUT_GPIO_BANK("VIRTUAL", 0x12, TROUT_GPIO_VIRTUAL_BASE, 0),
|
|
};
|
|
|
|
static void trout_gpio_irq_ack(struct irq_data *d)
|
|
{
|
|
int bank = TROUT_INT_TO_BANK(d->irq);
|
|
uint8_t mask = TROUT_INT_TO_MASK(d->irq);
|
|
int reg = TROUT_BANK_TO_STAT_REG(bank);
|
|
/*printk(KERN_INFO "trout_gpio_irq_ack irq %d\n", d->irq);*/
|
|
writeb(mask, TROUT_CPLD_BASE + reg);
|
|
}
|
|
|
|
static void trout_gpio_irq_mask(struct irq_data *d)
|
|
{
|
|
unsigned long flags;
|
|
uint8_t reg_val;
|
|
int bank = TROUT_INT_TO_BANK(d->irq);
|
|
uint8_t mask = TROUT_INT_TO_MASK(d->irq);
|
|
int reg = TROUT_BANK_TO_MASK_REG(bank);
|
|
|
|
local_irq_save(flags);
|
|
reg_val = trout_int_mask[bank] |= mask;
|
|
/*printk(KERN_INFO "trout_gpio_irq_mask irq %d => %d:%02x\n",
|
|
d->irq, bank, reg_val);*/
|
|
writeb(reg_val, TROUT_CPLD_BASE + reg);
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
static void trout_gpio_irq_unmask(struct irq_data *d)
|
|
{
|
|
unsigned long flags;
|
|
uint8_t reg_val;
|
|
int bank = TROUT_INT_TO_BANK(d->irq);
|
|
uint8_t mask = TROUT_INT_TO_MASK(d->irq);
|
|
int reg = TROUT_BANK_TO_MASK_REG(bank);
|
|
|
|
local_irq_save(flags);
|
|
reg_val = trout_int_mask[bank] &= ~mask;
|
|
/*printk(KERN_INFO "trout_gpio_irq_unmask irq %d => %d:%02x\n",
|
|
d->irq, bank, reg_val);*/
|
|
writeb(reg_val, TROUT_CPLD_BASE + reg);
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
int trout_gpio_irq_set_wake(struct irq_data *d, unsigned int on)
|
|
{
|
|
unsigned long flags;
|
|
int bank = TROUT_INT_TO_BANK(d->irq);
|
|
uint8_t mask = TROUT_INT_TO_MASK(d->irq);
|
|
|
|
local_irq_save(flags);
|
|
if(on)
|
|
trout_sleep_int_mask[bank] &= ~mask;
|
|
else
|
|
trout_sleep_int_mask[bank] |= mask;
|
|
local_irq_restore(flags);
|
|
return 0;
|
|
}
|
|
|
|
static void trout_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
|
|
{
|
|
int j, m;
|
|
unsigned v;
|
|
int bank;
|
|
int stat_reg;
|
|
int int_base = TROUT_INT_START;
|
|
uint8_t int_mask;
|
|
|
|
for (bank = 0; bank < 2; bank++) {
|
|
stat_reg = TROUT_BANK_TO_STAT_REG(bank);
|
|
v = readb(TROUT_CPLD_BASE + stat_reg);
|
|
int_mask = trout_int_mask[bank];
|
|
if (v & int_mask) {
|
|
writeb(v & int_mask, TROUT_CPLD_BASE + stat_reg);
|
|
printk(KERN_ERR "trout_gpio_irq_handler: got masked "
|
|
"interrupt: %d:%02x\n", bank, v & int_mask);
|
|
}
|
|
v &= ~int_mask;
|
|
while (v) {
|
|
m = v & -v;
|
|
j = fls(m) - 1;
|
|
/*printk(KERN_INFO "msm_gpio_irq_handler %d:%02x %02x b"
|
|
"it %d irq %d\n", bank, v, m, j, int_base + j);*/
|
|
v &= ~m;
|
|
generic_handle_irq(int_base + j);
|
|
}
|
|
int_base += TROUT_INT_BANK0_COUNT;
|
|
}
|
|
desc->irq_data.chip->irq_ack(&desc->irq_data);
|
|
}
|
|
|
|
static struct irq_chip trout_gpio_irq_chip = {
|
|
.name = "troutgpio",
|
|
.irq_ack = trout_gpio_irq_ack,
|
|
.irq_mask = trout_gpio_irq_mask,
|
|
.irq_unmask = trout_gpio_irq_unmask,
|
|
.irq_set_wake = trout_gpio_irq_set_wake,
|
|
};
|
|
|
|
/*
|
|
* Called from the processor-specific init to enable GPIO pin support.
|
|
*/
|
|
int __init trout_init_gpio(void)
|
|
{
|
|
int i;
|
|
for(i = TROUT_INT_START; i <= TROUT_INT_END; i++) {
|
|
irq_set_chip_and_handler(i, &trout_gpio_irq_chip,
|
|
handle_edge_irq);
|
|
set_irq_flags(i, IRQF_VALID);
|
|
}
|
|
|
|
for (i = 0; i < ARRAY_SIZE(msm_gpio_banks); i++)
|
|
gpiochip_add(&msm_gpio_banks[i].chip);
|
|
|
|
irq_set_irq_type(MSM_GPIO_TO_INT(17), IRQF_TRIGGER_HIGH);
|
|
irq_set_chained_handler(MSM_GPIO_TO_INT(17), trout_gpio_irq_handler);
|
|
irq_set_irq_wake(MSM_GPIO_TO_INT(17), 1);
|
|
|
|
return 0;
|
|
}
|
|
|
|
postcore_initcall(trout_init_gpio);
|
|
|