/*
* 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++) {
set_irq_chip(i, &trout_gpio_irq_chip);
set_irq_handler(i, 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);
set_irq_type(MSM_GPIO_TO_INT(17), IRQF_TRIGGER_HIGH);
set_irq_chained_handler(MSM_GPIO_TO_INT(17), trout_gpio_irq_handler);
set_irq_wake(MSM_GPIO_TO_INT(17), 1);
return 0;
}
postcore_initcall(trout_init_gpio);
