tps65912: irq: add interrupt controller

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>
Acked-by: Samuel Ortiz <sameo@linux.intel.com>
Acked-by: Liam Girdwood <lrg@ti.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

3 files changed, 238 insertions, 1 deletions

diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index c9925e5dad99..1d593b9085b7 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -36,7 +36,7 @@ obj-$(CONFIG_MFD_WM8994)	+= wm8994-core.o wm8994-irq.o
 obj-$(CONFIG_TPS6105X)          += tps6105x.o
 obj-$(CONFIG_TPS65010)          += tps65010.o
 obj-$(CONFIG_TPS6507X)          += tps6507x.o
-tps65912-objs                   := tps65912-core.o
+tps65912-objs                   := tps65912-core.o tps65912-irq.o
 obj-$(CONFIG_MFD_TPS65912)      += tps65912.o
 obj-$(CONFIG_MFD_TPS65912_I2C)  += tps65912-i2c.o
 obj-$(CONFIG_MFD_TPS65912_SPI)  += tps65912-spi.o
diff --git a/drivers/mfd/tps65912-core.c b/drivers/mfd/tps65912-core.c
index 10baf7655542..955bc00e4b20 100644
--- a/drivers/mfd/tps65912-core.c
+++ b/drivers/mfd/tps65912-core.c
@@ -124,8 +124,16 @@ EXPORT_SYMBOL_GPL(tps65912_reg_write);
 int tps65912_device_init(struct tps65912 *tps65912)
 {
         struct tps65912_board *pmic_plat_data = tps65912->dev->platform_data;
+        struct tps65912_platform_data *init_data;
         int ret, dcdc_avs, value;
 
+        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;
+
         mutex_init(&tps65912->io_mutex);
         dev_set_drvdata(tps65912->dev, tps65912);
 
@@ -145,9 +153,14 @@ int tps65912_device_init(struct tps65912 *tps65912)
         if (ret < 0)
                 goto err;
 
+        ret = tps65912_irq_init(tps65912, init_data->irq, init_data);
+        if (ret < 0)
+                goto err;
+
         return ret;
 
 err:
+        kfree(init_data);
         mfd_remove_devices(tps65912->dev);
         kfree(tps65912);
         return ret;
diff --git a/drivers/mfd/tps65912-irq.c b/drivers/mfd/tps65912-irq.c
new file mode 100644
index 000000000000..d360a83a2738
--- /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.
+ *
+ * This driver is based on wm8350 implementation.
+ */
+
+#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 the
+ * IRQ handler explicitly clears the IRQ it handles 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;
+}