tps65912: irq: add interrupt controller

This module controls the interrupt handling for the tps65912.
The interrupt sources can be the following:

- GPIO
- PWRON signal
- PWRHOLD signal
- Temperature detection

Signed-off-by: Margarita Olaya Cabrera <magi@slimlogic.co.uk>
Acked-by: Samuel Ortiz <sameo@linux.intel.com>
Acked-by: Liam Girdwood <lrg@ti.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Margarita Olaya 2011-06-09 14:50:13 -05:00 committed by Samuel Ortiz
parent 36e52873c6
commit d49a0f3f14
4 changed files with 243 additions and 1 deletions

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@ -36,7 +36,7 @@ obj-$(CONFIG_MFD_WM8994) += wm8994-core.o wm8994-irq.o
obj-$(CONFIG_TPS6105X) += tps6105x.o
obj-$(CONFIG_TPS65010) += tps65010.o
obj-$(CONFIG_TPS6507X) += tps6507x.o
tps65912-objs := tps65912-core.o
tps65912-objs := tps65912-core.o tps65912-irq.o
obj-$(CONFIG_MFD_TPS65912) += tps65912.o
obj-$(CONFIG_MFD_TPS65912_I2C) += tps65912-i2c.o
obj-$(CONFIG_MFD_TPS65912_SPI) += tps65912-spi.o

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@ -124,8 +124,16 @@ EXPORT_SYMBOL_GPL(tps65912_reg_write);
int tps65912_device_init(struct tps65912 *tps65912)
{
struct tps65912_board *pmic_plat_data = tps65912->dev->platform_data;
struct tps65912_platform_data *init_data;
int ret, dcdc_avs, value;
init_data = kzalloc(sizeof(struct tps65912_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;
mutex_init(&tps65912->io_mutex);
dev_set_drvdata(tps65912->dev, tps65912);
@ -145,9 +153,14 @@ int tps65912_device_init(struct tps65912 *tps65912)
if (ret < 0)
goto err;
ret = tps65912_irq_init(tps65912, init_data->irq, init_data);
if (ret < 0)
goto err;
return ret;
err:
kfree(init_data);
mfd_remove_devices(tps65912->dev);
kfree(tps65912);
return ret;

224
drivers/mfd/tps65912-irq.c Normal file
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@ -0,0 +1,224 @@
/*
* tps65912-irq.c -- TI TPS6591x
*
* Copyright 2011 Texas Instruments Inc.
*
* Author: Margarita Olaya <magi@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.
*
* This driver is based on wm8350 implementation.
*/
#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/tps65912.h>
static inline int irq_to_tps65912_irq(struct tps65912 *tps65912,
int irq)
{
return irq - tps65912->irq_base;
}
/*
* This is a threaded IRQ handler so can access I2C/SPI. Since the
* IRQ handler explicitly clears the IRQ it handles 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 tps65912_irq(int irq, void *irq_data)
{
struct tps65912 *tps65912 = irq_data;
u32 irq_sts;
u32 irq_mask;
u8 reg;
int i;
tps65912->read(tps65912, TPS65912_INT_STS, 1, &reg);
irq_sts = reg;
tps65912->read(tps65912, TPS65912_INT_STS2, 1, &reg);
irq_sts |= reg << 8;
tps65912->read(tps65912, TPS65912_INT_STS3, 1, &reg);
irq_sts |= reg << 16;
tps65912->read(tps65912, TPS65912_INT_STS4, 1, &reg);
irq_sts |= reg << 24;
tps65912->read(tps65912, TPS65912_INT_MSK, 1, &reg);
irq_mask = reg;
tps65912->read(tps65912, TPS65912_INT_MSK2, 1, &reg);
irq_mask |= reg << 8;
tps65912->read(tps65912, TPS65912_INT_MSK3, 1, &reg);
irq_mask |= reg << 16;
tps65912->read(tps65912, TPS65912_INT_MSK4, 1, &reg);
irq_mask |= reg << 24;
irq_sts &= ~irq_mask;
if (!irq_sts)
return IRQ_NONE;
for (i = 0; i < tps65912->irq_num; i++) {
if (!(irq_sts & (1 << i)))
continue;
handle_nested_irq(tps65912->irq_base + i);
}
/* Write the STS register back to clear IRQs we handled */
reg = irq_sts & 0xFF;
irq_sts >>= 8;
if (reg)
tps65912->write(tps65912, TPS65912_INT_STS, 1, &reg);
reg = irq_sts & 0xFF;
irq_sts >>= 8;
if (reg)
tps65912->write(tps65912, TPS65912_INT_STS2, 1, &reg);
reg = irq_sts & 0xFF;
irq_sts >>= 8;
if (reg)
tps65912->write(tps65912, TPS65912_INT_STS3, 1, &reg);
reg = irq_sts & 0xFF;
if (reg)
tps65912->write(tps65912, TPS65912_INT_STS4, 1, &reg);
return IRQ_HANDLED;
}
static void tps65912_irq_lock(struct irq_data *data)
{
struct tps65912 *tps65912 = irq_data_get_irq_chip_data(data);
mutex_lock(&tps65912->irq_lock);
}
static void tps65912_irq_sync_unlock(struct irq_data *data)
{
struct tps65912 *tps65912 = irq_data_get_irq_chip_data(data);
u32 reg_mask;
u8 reg;
tps65912->read(tps65912, TPS65912_INT_MSK, 1, &reg);
reg_mask = reg;
tps65912->read(tps65912, TPS65912_INT_MSK2, 1, &reg);
reg_mask |= reg << 8;
tps65912->read(tps65912, TPS65912_INT_MSK3, 1, &reg);
reg_mask |= reg << 16;
tps65912->read(tps65912, TPS65912_INT_MSK4, 1, &reg);
reg_mask |= reg << 24;
if (tps65912->irq_mask != reg_mask) {
reg = tps65912->irq_mask & 0xFF;
tps65912->write(tps65912, TPS65912_INT_MSK, 1, &reg);
reg = tps65912->irq_mask >> 8 & 0xFF;
tps65912->write(tps65912, TPS65912_INT_MSK2, 1, &reg);
reg = tps65912->irq_mask >> 16 & 0xFF;
tps65912->write(tps65912, TPS65912_INT_MSK3, 1, &reg);
reg = tps65912->irq_mask >> 24 & 0xFF;
tps65912->write(tps65912, TPS65912_INT_MSK4, 1, &reg);
}
mutex_unlock(&tps65912->irq_lock);
}
static void tps65912_irq_enable(struct irq_data *data)
{
struct tps65912 *tps65912 = irq_data_get_irq_chip_data(data);
tps65912->irq_mask &= ~(1 << irq_to_tps65912_irq(tps65912, data->irq));
}
static void tps65912_irq_disable(struct irq_data *data)
{
struct tps65912 *tps65912 = irq_data_get_irq_chip_data(data);
tps65912->irq_mask |= (1 << irq_to_tps65912_irq(tps65912, data->irq));
}
static struct irq_chip tps65912_irq_chip = {
.name = "tps65912",
.irq_bus_lock = tps65912_irq_lock,
.irq_bus_sync_unlock = tps65912_irq_sync_unlock,
.irq_disable = tps65912_irq_disable,
.irq_enable = tps65912_irq_enable,
};
int tps65912_irq_init(struct tps65912 *tps65912, int irq,
struct tps65912_platform_data *pdata)
{
int ret, cur_irq;
int flags = IRQF_ONESHOT;
u8 reg;
if (!irq) {
dev_warn(tps65912->dev, "No interrupt support, no core IRQ\n");
return 0;
}
if (!pdata || !pdata->irq_base) {
dev_warn(tps65912->dev, "No interrupt support, no IRQ base\n");
return 0;
}
/* Clear unattended interrupts */
tps65912->read(tps65912, TPS65912_INT_STS, 1, &reg);
tps65912->write(tps65912, TPS65912_INT_STS, 1, &reg);
tps65912->read(tps65912, TPS65912_INT_STS2, 1, &reg);
tps65912->write(tps65912, TPS65912_INT_STS2, 1, &reg);
tps65912->read(tps65912, TPS65912_INT_STS3, 1, &reg);
tps65912->write(tps65912, TPS65912_INT_STS3, 1, &reg);
tps65912->read(tps65912, TPS65912_INT_STS4, 1, &reg);
tps65912->write(tps65912, TPS65912_INT_STS4, 1, &reg);
/* Mask top level interrupts */
tps65912->irq_mask = 0xFFFFFFFF;
mutex_init(&tps65912->irq_lock);
tps65912->chip_irq = irq;
tps65912->irq_base = pdata->irq_base;
tps65912->irq_num = TPS65912_NUM_IRQ;
/* Register with genirq */
for (cur_irq = tps65912->irq_base;
cur_irq < tps65912->irq_num + tps65912->irq_base;
cur_irq++) {
irq_set_chip_data(cur_irq, tps65912);
irq_set_chip_and_handler(cur_irq, &tps65912_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, tps65912_irq, flags,
"tps65912", tps65912);
irq_set_irq_type(irq, IRQ_TYPE_LEVEL_LOW);
if (ret != 0)
dev_err(tps65912->dev, "Failed to request IRQ: %d\n", ret);
return ret;
}
int tps65912_irq_exit(struct tps65912 *tps65912)
{
free_irq(tps65912->chip_irq, tps65912);
return 0;
}

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@ -273,6 +273,8 @@ struct tps65912_board {
int is_dcdc2_avs;
int is_dcdc3_avs;
int is_dcdc4_avs;
int irq;
int irq_base;
struct regulator_init_data *tps65912_pmic_init_data;
};
@ -306,6 +308,7 @@ struct tps65912 {
};
struct tps65912_platform_data {
int irq;
int irq_base;
};
@ -317,5 +320,7 @@ int tps65912_reg_read(struct tps65912 *tps65912, u8 reg);
int tps65912_reg_write(struct tps65912 *tps65912, u8 reg, u8 val);
int tps65912_device_init(struct tps65912 *tps65912);
void tps65912_device_exit(struct tps65912 *tps65912);
int tps65912_irq_init(struct tps65912 *tps65912, int irq,
struct tps65912_platform_data *pdata);
#endif /* __LINUX_MFD_TPS65912_H */