/*
* 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/irqdomain.h>
#include <linux/gpio.h>
#include <linux/mfd/tps65910.h>
/*
* 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;
unsigned int reg;
u32 irq_sts;
u32 irq_mask;
int i;
tps65910_reg_read(tps65910, TPS65910_INT_STS, ®);
irq_sts = reg;
tps65910_reg_read(tps65910, TPS65910_INT_STS2, ®);
irq_sts |= reg << 8;
switch (tps65910_chip_id(tps65910)) {
case TPS65911:
tps65910_reg_read(tps65910, TPS65910_INT_STS3, ®);
irq_sts |= reg << 16;
}
tps65910_reg_read(tps65910, TPS65910_INT_MSK, ®);
irq_mask = reg;
tps65910_reg_read(tps65910, TPS65910_INT_MSK2, ®);
irq_mask |= reg << 8;
switch (tps65910_chip_id(tps65910)) {
case TPS65911:
tps65910_reg_read(tps65910, TPS65910_INT_MSK3, ®);
irq_mask |= reg << 16;
}
irq_sts &= ~irq_mask;
if (!irq_sts)
return IRQ_NONE;
for (i = 0; i < tps65910->irq_num; i++) {
if (!(irq_sts & (1 << i)))
continue;
handle_nested_irq(irq_find_mapping(tps65910->domain, i));
}
/* Write the STS register back to clear IRQs we handled */
reg = irq_sts & 0xFF;
irq_sts >>= 8;
tps65910_reg_write(tps65910, TPS65910_INT_STS, reg);
reg = irq_sts & 0xFF;
tps65910_reg_write(tps65910, TPS65910_INT_STS2, reg);
switch (tps65910_chip_id(tps65910)) {
case TPS65911:
reg = irq_sts >> 8;
tps65910_reg_write(tps65910, TPS65910_INT_STS3, 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);
u32 reg_mask;
unsigned int reg;
tps65910_reg_read(tps65910, TPS65910_INT_MSK, ®);
reg_mask = reg;
tps65910_reg_read(tps65910, TPS65910_INT_MSK2, ®);
reg_mask |= reg << 8;
switch (tps65910_chip_id(tps65910)) {
case TPS65911:
tps65910_reg_read(tps65910, TPS65910_INT_MSK3, ®);
reg_mask |= reg << 16;
}
if (tps65910->irq_mask != reg_mask) {
reg = tps65910->irq_mask & 0xFF;
tps65910_reg_write(tps65910, TPS65910_INT_MSK, reg);
reg = tps65910->irq_mask >> 8 & 0xFF;
tps65910_reg_write(tps65910, TPS65910_INT_MSK2, reg);
switch (tps65910_chip_id(tps65910)) {
case TPS65911:
reg = tps65910->irq_mask >> 16;
tps65910_reg_write(tps65910, TPS65910_INT_MSK3, 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 << data->hwirq);
}
static void tps65910_irq_disable(struct irq_data *data)
{
struct tps65910 *tps65910 = irq_data_get_irq_chip_data(data);
tps65910->irq_mask |= (1 << data->hwirq);
}
#ifdef CONFIG_PM_SLEEP
static int tps65910_irq_set_wake(struct irq_data *data, unsigned int enable)
{
struct tps65910 *tps65910 = irq_data_get_irq_chip_data(data);
return irq_set_irq_wake(tps65910->chip_irq, enable);
}
#else
#define tps65910_irq_set_wake NULL
#endif
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,
.irq_set_wake = tps65910_irq_set_wake,
};
static int tps65910_irq_map(struct irq_domain *h, unsigned int virq,
irq_hw_number_t hw)
{
struct tps65910 *tps65910 = h->host_data;
irq_set_chip_data(virq, tps65910);
irq_set_chip_and_handler(virq, &tps65910_irq_chip, handle_edge_irq);
irq_set_nested_thread(virq, 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(virq, IRQF_VALID);
#else
irq_set_noprobe(virq);
#endif
return 0;
}
static struct irq_domain_ops tps65910_domain_ops = {
.map = tps65910_irq_map,
.xlate = irq_domain_xlate_twocell,
};
int tps65910_irq_init(struct tps65910 *tps65910, int irq,
struct tps65910_platform_data *pdata)
{
int ret;
int flags = IRQF_ONESHOT;
if (!irq) {
dev_warn(tps65910->dev, "No interrupt support, no core IRQ\n");
return -EINVAL;
}
if (!pdata) {
dev_warn(tps65910->dev, "No interrupt support, no pdata\n");
return -EINVAL;
}
switch (tps65910_chip_id(tps65910)) {
case TPS65910:
tps65910->irq_num = TPS65910_NUM_IRQ;
break;
case TPS65911:
tps65910->irq_num = TPS65911_NUM_IRQ;
break;
}
if (pdata->irq_base > 0) {
pdata->irq_base = irq_alloc_descs(pdata->irq_base, 0,
tps65910->irq_num, -1);
if (pdata->irq_base < 0) {
dev_warn(tps65910->dev, "Failed to alloc IRQs: %d\n",
pdata->irq_base);
return pdata->irq_base;
}
}
tps65910->irq_mask = 0xFFFFFF;
mutex_init(&tps65910->irq_lock);
tps65910->chip_irq = irq;
tps65910->irq_base = pdata->irq_base;
if (pdata->irq_base > 0)
tps65910->domain = irq_domain_add_legacy(tps65910->dev->of_node,
tps65910->irq_num,
pdata->irq_base,
0,
&tps65910_domain_ops, tps65910);
else
tps65910->domain = irq_domain_add_linear(tps65910->dev->of_node,
tps65910->irq_num,
&tps65910_domain_ops, tps65910);
if (!tps65910->domain) {
dev_err(tps65910->dev, "Failed to create IRQ domain\n");
return -ENOMEM;
}
ret = request_threaded_irq(irq, NULL, tps65910_irq, flags,
"tps65910", tps65910);
irq_set_irq_type(irq, IRQ_TYPE_LEVEL_LOW);
if (ret != 0)
dev_err(tps65910->dev, "Failed to request IRQ: %d\n", ret);
return ret;
}
int tps65910_irq_exit(struct tps65910 *tps65910)
{
if (tps65910->chip_irq)
free_irq(tps65910->chip_irq, tps65910);
return 0;
}