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Commit e3471bdc authored by Graeme Gregory's avatar Graeme Gregory Committed by Liam Girdwood
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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: default avatarGraeme Gregory <gg@slimlogic.co.uk>
Signed-off-by: default avatarJorge Eduardo Candelaria <jedu@slimlogic.co.uk>
Reviewed-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: default avatarSamuel Ortiz <sameo@linux.intel.com>
Signed-off-by: default avatarLiam Girdwood <lrg@slimlogic.co.uk>
parent 2537df72

drivers/mfd/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -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

drivers/mfd/tps65910-irq.c

0 → 100644
+187 −0
Original line number Diff line number Diff line 
/*

 * 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;

}

drivers/mfd/tps65910.c

+12 −0
Original line number Diff line number Diff line
@@ -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:

include/linux/mfd/tps65910.h

+5 −0
Original line number Diff line number Diff line
@@ -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 */