regmap: Implement support for wake IRQs
Mark Brown [Tue, 5 Jun 2012 13:34:03 +0000 (14:34 +0100)]
Allow chips to provide a bank of registers for controlling the wake state
in a similar fashion to the masks and propagate the wake count to the
parent interrupt controller.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
(cherry picked from commit a43fd50dc99a5f65505f174eca5a421707d73b4c)

Change-Id: Id31e5ee9175bc3dbbaf079fc2bf204487e626b12
Signed-off-by: Mallikarjun Kasoju <mkasoju@nvidia.com>
Reviewed-on: http://git-master/r/131471
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Laxman Dewangan <ldewangan@nvidia.com>

drivers/base/regmap/regmap-irq.c
include/linux/regmap.h

index 8e94e0e..a897346 100644 (file)
@@ -29,9 +29,13 @@ struct regmap_irq_chip_data {
        int irq_base;
        struct irq_domain *domain;
 
+       int irq;
+       int wake_count;
+
        unsigned int *status_buf;
        unsigned int *mask_buf;
        unsigned int *mask_buf_def;
+       unsigned int *wake_buf;
 
        unsigned int irq_reg_stride;
 };
@@ -71,6 +75,16 @@ static void regmap_irq_sync_unlock(struct irq_data *data)
                                d->chip->mask_base + (i * map->reg_stride));
        }
 
+       /* If we've changed our wakeup count propagate it to the parent */
+       if (d->wake_count < 0)
+               for (i = d->wake_count; i < 0; i++)
+                       irq_set_irq_wake(d->irq, 0);
+       else if (d->wake_count > 0)
+               for (i = 0; i < d->wake_count; i++)
+                       irq_set_irq_wake(d->irq, 1);
+
+       d->wake_count = 0;
+
        mutex_unlock(&d->lock);
 }
 
@@ -92,12 +106,35 @@ static void regmap_irq_disable(struct irq_data *data)
        d->mask_buf[irq_data->reg_offset / map->reg_stride] |= irq_data->mask;
 }
 
+static int regmap_irq_set_wake(struct irq_data *data, unsigned int on)
+{
+       struct regmap_irq_chip_data *d = irq_data_get_irq_chip_data(data);
+       struct regmap *map = d->map;
+       const struct regmap_irq *irq_data = irq_to_regmap_irq(d, data->hwirq);
+
+       if (!d->chip->wake_base)
+               return -EINVAL;
+
+       if (on) {
+               d->wake_buf[irq_data->reg_offset / map->reg_stride]
+                       &= ~irq_data->mask;
+               d->wake_count++;
+       } else {
+               d->wake_buf[irq_data->reg_offset / map->reg_stride]
+                       |= irq_data->mask;
+               d->wake_count--;
+       }
+
+       return 0;
+}
+
 static struct irq_chip regmap_irq_chip = {
        .name                   = "regmap",
        .irq_bus_lock           = regmap_irq_lock,
        .irq_bus_sync_unlock    = regmap_irq_sync_unlock,
        .irq_disable            = regmap_irq_disable,
        .irq_enable             = regmap_irq_enable,
+       .irq_set_wake           = regmap_irq_set_wake,
 };
 
 static irqreturn_t regmap_irq_thread(int irq, void *d)
@@ -240,6 +277,14 @@ int regmap_add_irq_chip(struct regmap *map, int irq, int irq_flags,
        if (!d->mask_buf_def)
                goto err_alloc;
 
+       if (chip->wake_base) {
+               d->wake_buf = kzalloc(sizeof(unsigned int) * chip->num_regs,
+                                     GFP_KERNEL);
+               if (!d->wake_buf)
+                       goto err_alloc;
+       }
+
+       d->irq = irq;
        d->map = map;
        d->chip = chip;
        d->irq_base = irq_base;
@@ -294,6 +339,7 @@ int regmap_add_irq_chip(struct regmap *map, int irq, int irq_flags,
 err_domain:
        /* Should really dispose of the domain but... */
 err_alloc:
+       kfree(d->wake_buf);
        kfree(d->mask_buf_def);
        kfree(d->mask_buf);
        kfree(d->status_buf);
@@ -315,6 +361,7 @@ void regmap_del_irq_chip(int irq, struct regmap_irq_chip_data *d)
 
        free_irq(irq, d);
        /* We should unmap the domain but... */
+       kfree(d->wake_buf);
        kfree(d->mask_buf_def);
        kfree(d->mask_buf);
        kfree(d->status_buf);
index 59dc198..da09499 100644 (file)
@@ -215,6 +215,7 @@ struct regmap_irq {
  * @status_base: Base status register address.
  * @mask_base:   Base mask register address.
  * @ack_base:    Base ack address.  If zero then the chip is clear on read.
+ * @wake_base:   Base address for wake enables.  If zero unsupported.
  * @irq_reg_stride:  Stride to use for chips where registers are not contiguous.
  *
  * @num_regs:    Number of registers in each control bank.
@@ -228,6 +229,7 @@ struct regmap_irq_chip {
        unsigned int status_base;
        unsigned int mask_base;
        unsigned int ack_base;
+       unsigned int wake_base;
        unsigned int irq_reg_stride;
 
        int num_regs;