summaryrefslogtreecommitdiff
path: root/arch/arm/mach-msm/board-trout-gpio.c
diff options
context:
space:
mode:
authorDaniel Walker <dwalker@codeaurora.org>2010-03-31 03:11:56 +0400
committerDaniel Walker <dwalker@codeaurora.org>2010-06-17 23:55:41 +0400
commit8dadeea18be390bf3e5d47e6a8e2c752c7118b67 (patch)
tree860584aeb0533ca6964c9c31fa9706d987b551ec /arch/arm/mach-msm/board-trout-gpio.c
parent39b022ffcfbeb9e1d727db6404a1cf262c363e6e (diff)
downloadlinux-8dadeea18be390bf3e5d47e6a8e2c752c7118b67.tar.xz
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>
Diffstat (limited to 'arch/arm/mach-msm/board-trout-gpio.c')
-rw-r--r--arch/arm/mach-msm/board-trout-gpio.c115
1 files changed, 115 insertions, 0 deletions
diff --git a/arch/arm/mach-msm/board-trout-gpio.c b/arch/arm/mach-msm/board-trout-gpio.c
index 523d213bf79e..c50f3afc3134 100644
--- a/arch/arm/mach-msm/board-trout-gpio.c
+++ b/arch/arm/mach-msm/board-trout-gpio.c
@@ -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;
}