[PATCH 3/4] tps65912: irq: add interrupt controller

Margarita Olaya
2011-05-10T20:35:48Z

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>
---
drivers/mfd/Makefile | 2 +-
drivers/mfd/tps65912-irq.c | 224 ++++++++++++++++++++++++++++++++++++++++++
drivers/mfd/tps65912.c | 20 ++++
include/linux/mfd/tps65912.h | 5 +
4 files changed, 250 insertions(+), 1 deletions(-)
create mode 100644 drivers/mfd/tps65912-irq.c

diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 687bd2a..c902069 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -31,7 +31,7 @@ wm8350-objs += wm8350-irq.o
obj-$(CONFIG_MFD_WM8350) += wm8350.o
obj-$(CONFIG_MFD_WM8350_I2C) += wm8350-i2c.o
obj-$(CONFIG_MFD_WM8994) += wm8994-core.o wm8994-irq.o
-obj-$(CONFIG_MFD_TPS65912) += tps65912.o tps65912-gpio.o
+obj-$(CONFIG_MFD_TPS65912) += tps65912.o tps65912-gpio.o tps65912-irq.o

obj-$(CONFIG_TPS6105X) += tps6105x.o
obj-$(CONFIG_TPS65010) += tps65010.o
diff --git a/drivers/mfd/tps65912-irq.c b/drivers/mfd/tps65912-irq.c
new file mode 100644
index 0000000..8e0763a
--- /dev/null
+++ b/drivers/mfd/tps65912-irq.c
@@ -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.
+ *
+ */
+
+#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 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 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;
+}
+
diff --git a/drivers/mfd/tps65912.c b/drivers/mfd/tps65912.c
index 83dbc3a..44ddcd4 100644
--- a/drivers/mfd/tps65912.c
+++ b/drivers/mfd/tps65912.c
@@ -89,12 +89,20 @@ static int tps65912_i2c_probe(struct i2c_client *i2c,
{
struct tps65912 *tps65912;
struct tps65912_board *pmic_plat_data;
+ struct tps65912_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 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;
+
tps65912 = kzalloc(sizeof(struct tps65912), GFP_KERNEL);
if (tps65912 == NULL)
return -ENOMEM;
@@ -114,6 +122,10 @@ static int tps65912_i2c_probe(struct i2c_client *i2c,

tps65912_gpio_init(tps65912, pmic_plat_data->gpio_base);

+ ret = tps65912_irq_init(tps65912, init_data->irq, init_data);
+ if (ret < 0)
+ goto err;
+
return ret;

err:
@@ -226,6 +238,10 @@ static int __devinit tps65912_spi_probe(struct
spi_device *spi)
GFP_KERNEL);
if (init_data == NULL)
return -ENOMEM;
+
+ init_data->irq = pmic_plat_data->irq;
+ init_data->irq_base = pmic_plat_data->irq;
+
tps65912 = kzalloc(sizeof(struct tps65912), GFP_KERNEL);
if (tps65912 == NULL)
return -ENOMEM;
@@ -255,6 +271,10 @@ static int __devinit tps65912_spi_probe(struct
spi_device *spi)

tps65912_gpio_init(tps65912, pmic_plat_data->gpio_base);

+ ret = tps65912_irq_init(tps65912, init_data->irq, init_data);
+ if (ret < 0)
+ goto err;
+
return ret;

err:
diff --git a/include/linux/mfd/tps65912.h b/include/linux/mfd/tps65912.h
index bcfdc0d..9a576ab 100644
--- a/include/linux/mfd/tps65912.h
+++ b/include/linux/mfd/tps65912.h
@@ -406,6 +406,8 @@
*/
struct tps65912_board {
int gpio_base;
+ int irq;
+ int irq_base;
struct regulator_init_data *tps65912_pmic_init_data;
};

@@ -443,6 +445,7 @@ struct tps65912 {
};

struct tps65912_platform_data {
+ int irq;
int irq_base;
int is_dcdc1_avs;
int is_dcdc2_avs;
@@ -455,6 +458,8 @@ unsigned int tps_chip(void);
int tps65912_set_bits(struct tps65912 *tps65912, u8 reg, u8 mask);
int tps65912_clear_bits(struct tps65912 *tps65912, u8 reg, u8 mask);
void tps65912_gpio_init(struct tps65912 *tps65912, int gpio_base);
+int tps65912_irq_init(struct tps65912 *tps65912, int irq,
+ struct tps65912_platform_data *pdata);

#endif /* __LINUX_MFD_TPS65912_H */

--
1.7.0.4