regmap: irq: handle HW using separate rising/falling edge interrupts

Some interrupt controllers use separate bits for controlling rising
and falling edge interrupts in the mask register i.e. they have one
interrupt for rising edge and one for falling.

We already handle the case where we have a single interrupt in the
mask register and a separate type configuration register.

Add a new switch to regmap_irq_chip which tells the framework to use
the mask_base address for configuring the edge of the interrupts that
define type_falling/rising_mask values.

For such interrupts we never update the type_base bits. For interrupts
that don't define type masks or their regmap irq chip doesn't set the
type_in_mask to true everything stays the same.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 44 insertions, 20 deletions

diff --git a/drivers/base/regmap/regmap-irq.c b/drivers/base/regmap/regmap-irq.c
index 429ca8ed7e51..603b1554f81c 100644
--- a/drivers/base/regmap/regmap-irq.c
+++ b/drivers/base/regmap/regmap-irq.c
@@ -157,20 +157,23 @@ static void regmap_irq_sync_unlock(struct irq_data *data)
 		}
 	}
 
-	for (i = 0; i < d->chip->num_type_reg; i++) {
-		if (!d->type_buf_def[i])
-			continue;
-		reg = d->chip->type_base +
-			(i * map->reg_stride * d->type_reg_stride);
-		if (d->chip->type_invert)
-			ret = regmap_irq_update_bits(d, reg,
-				d->type_buf_def[i], ~d->type_buf[i]);
-		else
-			ret = regmap_irq_update_bits(d, reg,
-				d->type_buf_def[i], d->type_buf[i]);
-		if (ret != 0)
-			dev_err(d->map->dev, "Failed to sync type in %x\n",
-				reg);
+	/* Don't update the type bits if we're using mask bits for irq type. */
+	if (!d->chip->type_in_mask) {
+		for (i = 0; i < d->chip->num_type_reg; i++) {
+			if (!d->type_buf_def[i])
+				continue;
+			reg = d->chip->type_base +
+				(i * map->reg_stride * d->type_reg_stride);
+			if (d->chip->type_invert)
+				ret = regmap_irq_update_bits(d, reg,
+					d->type_buf_def[i], ~d->type_buf[i]);
+			else
+				ret = regmap_irq_update_bits(d, reg,
+					d->type_buf_def[i], d->type_buf[i]);
+			if (ret != 0)
+				dev_err(d->map->dev, "Failed to sync type in %x\n",
+					reg);
+		}
 	}
 
 	if (d->chip->runtime_pm)
@@ -194,8 +197,27 @@ static void regmap_irq_enable(struct irq_data *data)
 	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);
+	unsigned int mask, type;
+
+	type = irq_data->type_falling_mask | irq_data->type_rising_mask;
+
+	/*
+	 * The type_in_mask flag means that the underlying hardware uses
+	 * separate mask bits for rising and falling edge interrupts, but
+	 * we want to make them into a single virtual interrupt with
+	 * configurable edge.
+	 *
+	 * If the interrupt we're enabling defines the falling or rising
+	 * masks then instead of using the regular mask bits for this
+	 * interrupt, use the value previously written to the type buffer
+	 * at the corresponding offset in regmap_irq_set_type().
+	 */
+	if (d->chip->type_in_mask && type)
+		mask = d->type_buf[irq_data->reg_offset / map->reg_stride];
+	else
+		mask = irq_data->mask;
 
-	d->mask_buf[irq_data->reg_offset / map->reg_stride] &= ~irq_data->mask;
+	d->mask_buf[irq_data->reg_offset / map->reg_stride] &= ~mask;
 }
 
 static void regmap_irq_disable(struct irq_data *data)
@@ -430,6 +452,7 @@ int regmap_add_irq_chip(struct regmap *map, int irq, int irq_flags,
 	struct regmap_irq_chip_data *d;
 	int i;
 	int ret = -ENOMEM;
+	int num_type_reg;
 	u32 reg;
 	u32 unmask_offset;
 
@@ -479,13 +502,14 @@ int regmap_add_irq_chip(struct regmap *map, int irq, int irq_flags,
 			goto err_alloc;
 	}
 
-	if (chip->num_type_reg) {
-		d->type_buf_def = kcalloc(chip->num_type_reg,
-					sizeof(unsigned int), GFP_KERNEL);
+	num_type_reg = chip->type_in_mask ? chip->num_regs : chip->num_type_reg;
+	if (num_type_reg) {
+		d->type_buf_def = kcalloc(num_type_reg,
+					  sizeof(unsigned int), GFP_KERNEL);
 		if (!d->type_buf_def)
 			goto err_alloc;
 
-		d->type_buf = kcalloc(chip->num_type_reg, sizeof(unsigned int),
+		d->type_buf = kcalloc(num_type_reg, sizeof(unsigned int),
 				      GFP_KERNEL);
 		if (!d->type_buf)
 			goto err_alloc;
@@ -600,7 +624,7 @@ int regmap_add_irq_chip(struct regmap *map, int irq, int irq_flags,
 		}
 	}
 
-	if (chip->num_type_reg) {
+	if (chip->num_type_reg && !chip->type_in_mask) {
 		for (i = 0; i < chip->num_irqs; i++) {
 			reg = chip->irqs[i].type_reg_offset / map->reg_stride;
 			d->type_buf_def[reg] |= chip->irqs[i].type_rising_mask |