dect
/
linux-2.6
Archived
13
0
Fork 0
Code Releases Activity

TPS65910: IRQ: Add interrupt controller 

This module controls the interrupt handling for the tps chip. The
interrupt sources are the following:

- GPIO falling/rising edge detection
- Battery voltage below/above threshold
- PWRON signal
- PWRHOLD signal
- Temperature detection
- RTC alarm and periodic event

Signed-off-by: Graeme Gregory <gg@slimlogic.co.uk>
Signed-off-by: Jorge Eduardo Candelaria <jedu@slimlogic.co.uk>
Reviewed-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
This commit is contained in:
Graeme Gregory 2011-05-02 16:20:04 -05:00 committed by Liam Girdwood
parent 2537df722d
commit e3471bdc27
4 changed files with 205 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/mfd/Makefile
View File

@ -93,4 +93,4 @@ obj-$(CONFIG_MFD_CS5535) += cs5535-mfd.o
obj-$(CONFIG_MFD_OMAP_USB_HOST) += omap-usb-host.o
obj-$(CONFIG_MFD_PM8921_CORE) += pm8921-core.o
obj-$(CONFIG_MFD_PM8XXX_IRQ) += pm8xxx-irq.o
obj-$(CONFIG_MFD_TPS65910) += tps65910.o tps65910-gpio.o
obj-$(CONFIG_MFD_TPS65910) += tps65910.o tps65910-gpio.o tps65910-irq.o

187
drivers/mfd/tps65910-irq.c Normal file
View File

@ -0,0 +1,187 @@
/*
* tps65910-irq.c -- TI TPS6591x
*
* Copyright 2010 Texas Instruments Inc.
*
* Author: Graeme Gregory <gg@slimlogic.co.uk>
* Author: Jorge Eduardo Candelaria <jedu@slimlogic.co.uk>
*
* 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/init.h>
#include <linux/bug.h>
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/gpio.h>
#include <linux/mfd/tps65910.h>
static inline int irq_to_tps65910_irq(struct tps65910 *tps65910,
int irq)
{
return (irq - tps65910->irq_base);
}
/*
* This is a threaded IRQ handler so can access I2C/SPI. Since all
* interrupts are clear on read the IRQ line will be reasserted and
* the physical IRQ will be handled again if another interrupt is
* asserted while we run - in the normal course of events this is a
* rare occurrence so we save I2C/SPI reads. We're also assuming that
* it's rare to get lots of interrupts firing simultaneously so try to
* minimise I/O.
*/
static irqreturn_t tps65910_irq(int irq, void *irq_data)
{
struct tps65910 *tps65910 = irq_data;
u16 irq_sts;
u16 irq_mask;
u8 reg;
int i;
tps65910->read(tps65910, TPS65910_INT_STS, 1, &reg);
irq_sts = reg;
tps65910->read(tps65910, TPS65910_INT_STS2, 1, &reg);
irq_sts |= reg << 8;
tps65910->read(tps65910, TPS65910_INT_MSK, 1, &reg);
irq_mask = reg;
tps65910->read(tps65910, TPS65910_INT_MSK2, 1, &reg);
irq_mask |= reg << 8;
irq_sts &= ~irq_mask;
if (!irq_sts)
return IRQ_NONE;
for (i = 0; i < TPS65910_NUM_IRQ; i++) {
if (!(irq_sts & (1 << i)))
continue;
handle_nested_irq(tps65910->irq_base + i);
}
/* Write the STS register back to clear IRQs we handled */
reg = irq_sts & 0xFF;
tps65910->write(tps65910, TPS65910_INT_STS, 1, &reg);
reg = irq_sts >> 8;
tps65910->write(tps65910, TPS65910_INT_STS2, 1, &reg);
return IRQ_HANDLED;
}
static void tps65910_irq_lock(struct irq_data *data)
{
struct tps65910 *tps65910 = irq_data_get_irq_chip_data(data);
mutex_lock(&tps65910->irq_lock);
}
static void tps65910_irq_sync_unlock(struct irq_data *data)
{
struct tps65910 *tps65910 = irq_data_get_irq_chip_data(data);
u16 reg_mask;
u8 reg;
tps65910->read(tps65910, TPS65910_INT_MSK, 1, &reg);
reg_mask = reg;
tps65910->read(tps65910, TPS65910_INT_MSK2, 1, &reg);
reg_mask |= reg << 8;
if (tps65910->irq_mask != reg_mask) {
reg = tps65910->irq_mask & 0xFF;
tps65910->write(tps65910, TPS65910_INT_MSK, 1, &reg);
reg = tps65910->irq_mask >> 8;
tps65910->write(tps65910, TPS65910_INT_MSK2, 1, &reg);
}
mutex_unlock(&tps65910->irq_lock);
}
static void tps65910_irq_enable(struct irq_data *data)
{
struct tps65910 *tps65910 = irq_data_get_irq_chip_data(data);
tps65910->irq_mask &= ~( 1 << irq_to_tps65910_irq(tps65910, data->irq));
}
static void tps65910_irq_disable(struct irq_data *data)
{
struct tps65910 *tps65910 = irq_data_get_irq_chip_data(data);
tps65910->irq_mask |= ( 1 << irq_to_tps65910_irq(tps65910, data->irq));
}
static struct irq_chip tps65910_irq_chip = {
.name = "tps65910",
.irq_bus_lock = tps65910_irq_lock,
.irq_bus_sync_unlock = tps65910_irq_sync_unlock,
.irq_disable = tps65910_irq_disable,
.irq_enable = tps65910_irq_enable,
};
int tps65910_irq_init(struct tps65910 *tps65910, int irq,
struct tps65910_platform_data *pdata)
{
int ret, cur_irq;
int flags = IRQF_ONESHOT;
u8 reg;
if (!irq) {
dev_warn(tps65910->dev, "No interrupt support, no core IRQ\n");
return -EINVAL;
}
if (!pdata || !pdata->irq_base) {
dev_warn(tps65910->dev, "No interrupt support, no IRQ base\n");
return -EINVAL;
}
/* Mask top level interrupts */
reg = 0xFF;
tps65910->write(tps65910, TPS65910_INT_MSK, 1, &reg);
reg = 0x03;
tps65910->write(tps65910, TPS65910_INT_MSK2, 1, &reg);
mutex_init(&tps65910->irq_lock);
tps65910->chip_irq = irq;
tps65910->irq_base = pdata->irq_base;
/* Register with genirq */
for (cur_irq = tps65910->irq_base;
cur_irq < TPS65910_NUM_IRQ + tps65910->irq_base;
cur_irq++) {
irq_set_chip_data(cur_irq, tps65910);
irq_set_chip_and_handler(cur_irq, &tps65910_irq_chip,
handle_edge_irq);
irq_set_nested_thread(cur_irq, 1);
/* ARM needs us to explicitly flag the IRQ as valid
* and will set them noprobe when we do so. */
#ifdef CONFIG_ARM
set_irq_flags(cur_irq, IRQF_VALID);
#else
irq_set_noprobe(cur_irq);
#endif
}
ret = request_threaded_irq(irq, NULL, tps65910_irq, flags,
"tps65910", tps65910);
if (ret != 0)
dev_err(tps65910->dev, "Failed to request IRQ: %d\n", ret);
return ret;
}
int tps65910_irq_exit(struct tps65910 *tps65910)
{
free_irq(tps65910->chip_irq, tps65910);
return 0;
}

12
drivers/mfd/tps65910.c
View File

@ -136,12 +136,20 @@ static int tps65910_i2c_probe(struct i2c_client *i2c,
{
struct tps65910 *tps65910;
struct tps65910_board *pmic_plat_data;
struct tps65910_platform_data *init_data;
int ret = 0;
pmic_plat_data = dev_get_platdata(&i2c->dev);
if (!pmic_plat_data)
return -EINVAL;
init_data = kzalloc(sizeof(struct tps65910_platform_data), GFP_KERNEL);
if (init_data == NULL)
return -ENOMEM;
init_data->irq = pmic_plat_data->irq;
init_data->irq_base = pmic_plat_data->irq;
tps65910 = kzalloc(sizeof(struct tps65910), GFP_KERNEL);
if (tps65910 == NULL)
return -ENOMEM;
@ -161,6 +169,10 @@ static int tps65910_i2c_probe(struct i2c_client *i2c,
tps65910_gpio_init(tps65910, pmic_plat_data->gpio_base);
ret = tps65910_irq_init(tps65910, init_data->irq, init_data);
if (ret < 0)
goto err;
return ret;
err:

5
include/linux/mfd/tps65910.h
View File

@ -715,6 +715,8 @@
struct tps65910_board {
int gpio_base;
int irq;
int irq_base;
struct regulator_init_data *tps65910_pmic_init_data;
};
@ -745,11 +747,14 @@ struct tps65910 {
};
struct tps65910_platform_data {
int irq;
int irq_base;
};
int tps65910_set_bits(struct tps65910 *tps65910, u8 reg, u8 mask);
int tps65910_clear_bits(struct tps65910 *tps65910, u8 reg, u8 mask);
void tps65910_gpio_init(struct tps65910 *tps65910, int gpio_base);
int tps65910_irq_init(struct tps65910 *tps65910, int irq,
struct tps65910_platform_data *pdata);
#endif /* __LINUX_MFD_TPS65910_H */