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Message-Id: <A091F271-DC3C-468A-9175-93D2C4580F10@slimlogic.co.uk>
Date: Thu, 14 Apr 2011 10:49:35 -0500
From: Jorge Eduardo Candelaria <jedu@...mlogic.co.uk>
To: linux-kernel@...r.kernel.org
Cc: broonie@...nsource.wolfsonmicro.com, lrg@...com,
sameo@...ux.intel.com
Subject: [PATCH 3/4] TPS65910: IRQ: Add interrupt controller
From: Graeme Gregory <gg@...mlogic.co.uk>
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: Jorge Eduardo Candelaria <jedu@...mlogic.co.uk>
---
drivers/mfd/Makefile | 2 +-
drivers/mfd/tps65910-irq.c | 187 ++++++++++++++++++++++++++++++++++++++++++
drivers/mfd/tps65910.c | 12 +++
include/linux/mfd/tps65910.h | 5 +
4 files changed, 205 insertions(+), 1 deletions(-)
create mode 100644 drivers/mfd/tps65910-irq.c
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 012ed17..c771eed 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -88,4 +88,4 @@ obj-$(CONFIG_MFD_VX855) += vx855.o
obj-$(CONFIG_MFD_WL1273_CORE) += wl1273-core.o
obj-$(CONFIG_MFD_CS5535) += cs5535-mfd.o
obj-$(CONFIG_MFD_OMAP_USB_HOST) += omap-usb-host.o
-obj-$(CONFIG_MFD_TPS65910) += tps65910.o tps65910-gpio.o
+obj-$(CONFIG_MFD_TPS65910) += tps65910.o tps65910-gpio.o tps65910-irq.o
diff --git a/drivers/mfd/tps65910-irq.c b/drivers/mfd/tps65910-irq.c
new file mode 100644
index 0000000..70fb485
--- /dev/null
+++ b/drivers/mfd/tps65910-irq.c
@@ -0,0 +1,187 @@
+/*
+ * tps65910-irq.c -- TI TPS6591x
+ *
+ * Copyright 2010 Texas Instruments Inc.
+ *
+ * Author: Graeme Gregory <gg@...mlogic.co.uk>
+ * Author: Jorge Eduardo Candelaria <jedu@...mlogic.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, ®);
+ irq_sts = reg;
+ tps65910->read(tps65910, TPS65910_INT_STS2, 1, ®);
+ irq_sts |= reg << 8;
+
+ tps65910->read(tps65910, TPS65910_INT_MSK, 1, ®);
+ irq_mask = reg;
+ tps65910->read(tps65910, TPS65910_INT_STS2, 1, ®);
+ 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 = irq_sts >> 8;
+ tps65910->write(tps65910, TPS65910_INT_STS2, 1, ®);
+
+ return IRQ_HANDLED;
+}
+
+static void tps65910_irq_lock(unsigned int irq)
+{
+ struct tps65910 *tps65910 = irq_get_chip_data(irq);
+
+ mutex_lock(&tps65910->irq_lock);
+}
+
+static void tps65910_irq_sync_unlock(unsigned int irq)
+{
+ struct tps65910 *tps65910 = irq_get_chip_data(irq);
+ u16 reg_mask;
+ u8 reg;
+
+ tps65910->read(tps65910, TPS65910_INT_MSK, 1, ®);
+ reg_mask = reg;
+ tps65910->read(tps65910, TPS65910_INT_MSK2, 1, ®);
+ reg_mask |= reg << 8;
+
+ if (tps65910->irq_mask != reg_mask) {
+ reg = tps65910->irq_mask & 0xFF;
+ tps65910->write(tps65910, TPS65910_INT_MSK, 1, ®);
+ reg = tps65910->irq_mask >> 8;
+ tps65910->write(tps65910, TPS65910_INT_MSK2, 1, ®);
+ }
+ mutex_unlock(&tps65910->irq_lock);
+}
+
+static void tps65910_irq_enable(unsigned int irq)
+{
+ struct tps65910 *tps65910 = irq_get_chip_data(irq);
+
+ tps65910->irq_mask &= ~( 1 << irq_to_tps65910_irq(tps65910, irq));
+}
+
+static void tps65910_irq_disable(unsigned int irq)
+{
+ struct tps65910 *tps65910 = irq_get_chip_data(irq);
+
+ tps65910->irq_mask |= ( 1 << irq_to_tps65910_irq(tps65910, 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 = 0x03;
+ tps65910->write(tps65910, TPS65910_INT_MSK2, 1, ®);
+
+ 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
+ set_irq_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;
+}
diff --git a/drivers/mfd/tps65910.c b/drivers/mfd/tps65910.c
index c78341a..b400b74 100644
--- a/drivers/mfd/tps65910.c
+++ b/drivers/mfd/tps65910.c
@@ -90,12 +90,20 @@ 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;
@@ -114,6 +122,10 @@ 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:
diff --git a/include/linux/mfd/tps65910.h b/include/linux/mfd/tps65910.h
index bf3597e..afc1896 100644
--- a/include/linux/mfd/tps65910.h
+++ b/include/linux/mfd/tps65910.h
@@ -715,6 +715,8 @@
struct tps65910_board {
int gpio_base;
+ int irq;
+ int irq_base;
struct regulator_init_data *tps65910_pmic_init_data;
};
@@ -744,9 +746,12 @@ struct tps65910 {
};
struct tps65910_platform_data {
+ int irq;
int irq_base;
};
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 */
--
1.7.1
--
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