forked from luck/tmp_suning_uos_patched
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
Liam Girdwood
parent
2537df722d
commit
e3471bdc27
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@ -93,4 +93,4 @@ obj-$(CONFIG_MFD_CS5535) += cs5535-mfd.o
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obj-$(CONFIG_MFD_OMAP_USB_HOST) += omap-usb-host.o
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obj-$(CONFIG_MFD_PM8921_CORE) += pm8921-core.o
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obj-$(CONFIG_MFD_PM8XXX_IRQ) += pm8xxx-irq.o
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obj-$(CONFIG_MFD_TPS65910) += tps65910.o tps65910-gpio.o
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obj-$(CONFIG_MFD_TPS65910) += tps65910.o tps65910-gpio.o tps65910-irq.o
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187
drivers/mfd/tps65910-irq.c
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187
drivers/mfd/tps65910-irq.c
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@ -0,0 +1,187 @@
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/*
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* tps65910-irq.c -- TI TPS6591x
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*
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* Copyright 2010 Texas Instruments Inc.
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*
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* Author: Graeme Gregory <gg@slimlogic.co.uk>
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* Author: Jorge Eduardo Candelaria <jedu@slimlogic.co.uk>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/bug.h>
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#include <linux/device.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/gpio.h>
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#include <linux/mfd/tps65910.h>
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static inline int irq_to_tps65910_irq(struct tps65910 *tps65910,
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int irq)
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{
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return (irq - tps65910->irq_base);
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}
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/*
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* This is a threaded IRQ handler so can access I2C/SPI. Since all
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* interrupts are clear on read the IRQ line will be reasserted and
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* the physical IRQ will be handled again if another interrupt is
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* asserted while we run - in the normal course of events this is a
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* rare occurrence so we save I2C/SPI reads. We're also assuming that
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* it's rare to get lots of interrupts firing simultaneously so try to
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* minimise I/O.
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*/
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static irqreturn_t tps65910_irq(int irq, void *irq_data)
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{
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struct tps65910 *tps65910 = irq_data;
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u16 irq_sts;
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u16 irq_mask;
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u8 reg;
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int i;
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tps65910->read(tps65910, TPS65910_INT_STS, 1, ®);
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irq_sts = reg;
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tps65910->read(tps65910, TPS65910_INT_STS2, 1, ®);
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irq_sts |= reg << 8;
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tps65910->read(tps65910, TPS65910_INT_MSK, 1, ®);
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irq_mask = reg;
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tps65910->read(tps65910, TPS65910_INT_MSK2, 1, ®);
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irq_mask |= reg << 8;
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irq_sts &= ~irq_mask;
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if (!irq_sts)
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return IRQ_NONE;
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for (i = 0; i < TPS65910_NUM_IRQ; i++) {
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if (!(irq_sts & (1 << i)))
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continue;
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handle_nested_irq(tps65910->irq_base + i);
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}
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/* Write the STS register back to clear IRQs we handled */
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reg = irq_sts & 0xFF;
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tps65910->write(tps65910, TPS65910_INT_STS, 1, ®);
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reg = irq_sts >> 8;
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tps65910->write(tps65910, TPS65910_INT_STS2, 1, ®);
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return IRQ_HANDLED;
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}
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static void tps65910_irq_lock(struct irq_data *data)
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{
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struct tps65910 *tps65910 = irq_data_get_irq_chip_data(data);
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mutex_lock(&tps65910->irq_lock);
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}
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static void tps65910_irq_sync_unlock(struct irq_data *data)
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{
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struct tps65910 *tps65910 = irq_data_get_irq_chip_data(data);
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u16 reg_mask;
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u8 reg;
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tps65910->read(tps65910, TPS65910_INT_MSK, 1, ®);
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reg_mask = reg;
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tps65910->read(tps65910, TPS65910_INT_MSK2, 1, ®);
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reg_mask |= reg << 8;
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if (tps65910->irq_mask != reg_mask) {
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reg = tps65910->irq_mask & 0xFF;
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tps65910->write(tps65910, TPS65910_INT_MSK, 1, ®);
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reg = tps65910->irq_mask >> 8;
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tps65910->write(tps65910, TPS65910_INT_MSK2, 1, ®);
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}
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mutex_unlock(&tps65910->irq_lock);
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}
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static void tps65910_irq_enable(struct irq_data *data)
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{
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struct tps65910 *tps65910 = irq_data_get_irq_chip_data(data);
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tps65910->irq_mask &= ~( 1 << irq_to_tps65910_irq(tps65910, data->irq));
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}
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static void tps65910_irq_disable(struct irq_data *data)
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{
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struct tps65910 *tps65910 = irq_data_get_irq_chip_data(data);
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tps65910->irq_mask |= ( 1 << irq_to_tps65910_irq(tps65910, data->irq));
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}
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static struct irq_chip tps65910_irq_chip = {
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.name = "tps65910",
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.irq_bus_lock = tps65910_irq_lock,
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.irq_bus_sync_unlock = tps65910_irq_sync_unlock,
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.irq_disable = tps65910_irq_disable,
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.irq_enable = tps65910_irq_enable,
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};
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int tps65910_irq_init(struct tps65910 *tps65910, int irq,
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struct tps65910_platform_data *pdata)
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{
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int ret, cur_irq;
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int flags = IRQF_ONESHOT;
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u8 reg;
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if (!irq) {
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dev_warn(tps65910->dev, "No interrupt support, no core IRQ\n");
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return -EINVAL;
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}
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if (!pdata || !pdata->irq_base) {
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dev_warn(tps65910->dev, "No interrupt support, no IRQ base\n");
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return -EINVAL;
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}
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/* Mask top level interrupts */
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reg = 0xFF;
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tps65910->write(tps65910, TPS65910_INT_MSK, 1, ®);
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reg = 0x03;
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tps65910->write(tps65910, TPS65910_INT_MSK2, 1, ®);
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mutex_init(&tps65910->irq_lock);
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tps65910->chip_irq = irq;
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tps65910->irq_base = pdata->irq_base;
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/* Register with genirq */
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for (cur_irq = tps65910->irq_base;
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cur_irq < TPS65910_NUM_IRQ + tps65910->irq_base;
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cur_irq++) {
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irq_set_chip_data(cur_irq, tps65910);
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irq_set_chip_and_handler(cur_irq, &tps65910_irq_chip,
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handle_edge_irq);
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irq_set_nested_thread(cur_irq, 1);
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/* ARM needs us to explicitly flag the IRQ as valid
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* and will set them noprobe when we do so. */
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#ifdef CONFIG_ARM
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set_irq_flags(cur_irq, IRQF_VALID);
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#else
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irq_set_noprobe(cur_irq);
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#endif
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}
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ret = request_threaded_irq(irq, NULL, tps65910_irq, flags,
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"tps65910", tps65910);
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if (ret != 0)
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dev_err(tps65910->dev, "Failed to request IRQ: %d\n", ret);
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return ret;
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}
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int tps65910_irq_exit(struct tps65910 *tps65910)
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{
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free_irq(tps65910->chip_irq, tps65910);
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return 0;
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}
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@ -136,12 +136,20 @@ static int tps65910_i2c_probe(struct i2c_client *i2c,
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{
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struct tps65910 *tps65910;
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struct tps65910_board *pmic_plat_data;
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struct tps65910_platform_data *init_data;
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int ret = 0;
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pmic_plat_data = dev_get_platdata(&i2c->dev);
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if (!pmic_plat_data)
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return -EINVAL;
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init_data = kzalloc(sizeof(struct tps65910_platform_data), GFP_KERNEL);
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if (init_data == NULL)
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return -ENOMEM;
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init_data->irq = pmic_plat_data->irq;
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init_data->irq_base = pmic_plat_data->irq;
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tps65910 = kzalloc(sizeof(struct tps65910), GFP_KERNEL);
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if (tps65910 == NULL)
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return -ENOMEM;
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@ -161,6 +169,10 @@ static int tps65910_i2c_probe(struct i2c_client *i2c,
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tps65910_gpio_init(tps65910, pmic_plat_data->gpio_base);
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ret = tps65910_irq_init(tps65910, init_data->irq, init_data);
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if (ret < 0)
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goto err;
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return ret;
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err:
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@ -715,6 +715,8 @@
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struct tps65910_board {
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int gpio_base;
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int irq;
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int irq_base;
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struct regulator_init_data *tps65910_pmic_init_data;
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};
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@ -745,11 +747,14 @@ struct tps65910 {
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};
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struct tps65910_platform_data {
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int irq;
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int irq_base;
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};
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int tps65910_set_bits(struct tps65910 *tps65910, u8 reg, u8 mask);
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int tps65910_clear_bits(struct tps65910 *tps65910, u8 reg, u8 mask);
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void tps65910_gpio_init(struct tps65910 *tps65910, int gpio_base);
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int tps65910_irq_init(struct tps65910 *tps65910, int irq,
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struct tps65910_platform_data *pdata);
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#endif /* __LINUX_MFD_TPS65910_H */
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