OpenE2K
/
linux
6
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

arm: msm: trout: add trout specific gpio interrupts 

This adds the interrupt layer onto the initial trout gpio
changes.

There changes were adapted from the Google driver which lists
Arve Hjønnevåg <arve@android.com> as the author.

Signed-off-by: Daniel Walker <dwalker@codeaurora.org>
This commit is contained in:
Daniel Walker 2010-03-30 16:11:56 -07:00
parent 39b022ffcf
commit 8dadeea18b
1 changed files with 115 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

115
arch/arm/mach-msm/board-trout-gpio.c
View File

@ -15,10 +15,20 @@
#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 */
@ -95,16 +105,121 @@ static struct msm_gpio_chip msm_gpio_banks[] = {
TROUT_GPIO_BANK("VIRTUAL", 0x12, TROUT_GPIO_VIRTUAL_BASE, 0),
};
static void trout_gpio_irq_ack(unsigned int irq)
{
int bank = TROUT_INT_TO_BANK(irq);
uint8_t mask = TROUT_INT_TO_MASK(irq);
int reg = TROUT_BANK_TO_STAT_REG(bank);
/*printk(KERN_INFO "trout_gpio_irq_ack irq %d\n", irq);*/
writeb(mask, TROUT_CPLD_BASE + reg);
}
static void trout_gpio_irq_mask(unsigned int irq)
{
unsigned long flags;
uint8_t reg_val;
int bank = TROUT_INT_TO_BANK(irq);
uint8_t mask = TROUT_INT_TO_MASK(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",
irq, bank, reg_val);*/
writeb(reg_val, TROUT_CPLD_BASE + reg);
local_irq_restore(flags);
}
static void trout_gpio_irq_unmask(unsigned int irq)
{
unsigned long flags;
uint8_t reg_val;
int bank = TROUT_INT_TO_BANK(irq);
uint8_t mask = TROUT_INT_TO_MASK(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",
irq, bank, reg_val);*/
writeb(reg_val, TROUT_CPLD_BASE + reg);
local_irq_restore(flags);
}
int trout_gpio_irq_set_wake(unsigned int irq, unsigned int on)
{
unsigned long flags;
int bank = TROUT_INT_TO_BANK(irq);
uint8_t mask = TROUT_INT_TO_MASK(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->chip->ack(irq);
}
static struct irq_chip trout_gpio_irq_chip = {
.name = "troutgpio",
.ack = trout_gpio_irq_ack,
.mask = trout_gpio_irq_mask,
.unmask = trout_gpio_irq_unmask,
.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;
}