pinctrl/abx500: replace IRQ offsets with table read-in values

The ABx500 GPIO controller used to provide a set of virtual contiguous
IRQs for use by sub-devices, but they have been removed after a request
from Mainline Maintainers. Now the AB8500 core driver deals with almost
all IRQ related issues instead.

The ABx500 GPIO driver is now only used to convert between GPIO and IRQ
numbers which is actually quite difficult, as the ABx500 GPIO's
associated IRQs are clustered together throughout the interrupt number
space at irregular intervals. To solve this quandary, we have placed the
read-in values into the existing cluster information table to use during
conversion.

Signed-off-by: Lee Jones <lee.jones@linaro.org>
[Moved irq_base removal into this patch]
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/pinctrl-ab8500.c

@@ -456,9 +456,9 @@ struct alternate_functions ab8500_alternate_functions[AB8500_GPIO_MAX_NUMBER + 1
  *	GPIO36 to GPIO41
  */
 struct abx500_gpio_irq_cluster ab8500_gpio_irq_cluster[] = {
-	GPIO_IRQ_CLUSTER(6, 13, 0),
-	GPIO_IRQ_CLUSTER(24, 25, 0),
-	GPIO_IRQ_CLUSTER(36, 41, 0),
+	GPIO_IRQ_CLUSTER(6,  13, 34),
+	GPIO_IRQ_CLUSTER(24, 25, 24),
+	GPIO_IRQ_CLUSTER(36, 41, 14),
 };
 
 static struct abx500_pinctrl_soc_data ab8500_soc = {

drivers/pinctrl/pinctrl-ab8505.c

@@ -349,11 +349,11 @@ struct alternate_functions ab8505_alternate_functions[AB8505_GPIO_MAX_NUMBER + 1
  *	GPIO52 to GPIO53
  */
 struct abx500_gpio_irq_cluster ab8505_gpio_irq_cluster[] = {
-	GPIO_IRQ_CLUSTER(10, 11, 0),
-	GPIO_IRQ_CLUSTER(13, 13, 0),
-	GPIO_IRQ_CLUSTER(40, 41, 0),
-	GPIO_IRQ_CLUSTER(50, 50, 0),
-	GPIO_IRQ_CLUSTER(52, 53, 0),
+	GPIO_IRQ_CLUSTER(10, 11, 34),
+	GPIO_IRQ_CLUSTER(13, 13, 34),
+	GPIO_IRQ_CLUSTER(40, 41, 14),
+	GPIO_IRQ_CLUSTER(50, 50, 63),
+	GPIO_IRQ_CLUSTER(52, 53, 63),
 };
 
 static struct abx500_pinctrl_soc_data ab8505_soc = {

drivers/pinctrl/pinctrl-ab8540.c

@@ -377,8 +377,9 @@ static struct pullud ab8540_pullud = {
  *	GPIO51 to GPIO54
  */
 struct abx500_gpio_irq_cluster ab8540_gpio_irq_cluster[] = {
-	GPIO_IRQ_CLUSTER(43, 44, 2),
-	GPIO_IRQ_CLUSTER(51, 54, 0),
+	GPIO_IRQ_CLUSTER(43, 43, 126),
+	GPIO_IRQ_CLUSTER(44, 44, 127),
+	GPIO_IRQ_CLUSTER(51, 54, 63),
 };
 
 static struct abx500_pinctrl_soc_data ab8540_soc = {

drivers/pinctrl/pinctrl-ab9540.c

@@ -455,10 +455,10 @@ struct alternate_functions ab9540alternate_functions[AB9540_GPIO_MAX_NUMBER + 1]
 };
 
 struct abx500_gpio_irq_cluster ab9540_gpio_irq_cluster[] = {
-	GPIO_IRQ_CLUSTER(10, 13, 0),
-	GPIO_IRQ_CLUSTER(24, 25, 0),
-	GPIO_IRQ_CLUSTER(40, 41, 0),
-	GPIO_IRQ_CLUSTER(50, 54, 0),
+	GPIO_IRQ_CLUSTER(10, 13, 34),
+	GPIO_IRQ_CLUSTER(24, 25, 24),
+	GPIO_IRQ_CLUSTER(40, 41, 14),
+	GPIO_IRQ_CLUSTER(50, 54, 63),
 };
 
 static struct abx500_pinctrl_soc_data ab9540_soc = {

drivers/pinctrl/pinctrl-abx500.c

@@ -100,7 +100,6 @@ struct abx500_pinctrl {
 	struct gpio_chip chip;
 	struct ab8500 *parent;
 	struct mutex lock;
-	u32 irq_base;
 	struct abx500_gpio_irq_cluster *irq_cluster;
 	int irq_cluster_size;
 };
@@ -262,18 +261,24 @@ static int abx500_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
 	struct abx500_pinctrl *pct = to_abx500_pinctrl(chip);
 	/* The AB8500 GPIO numbers are off by one */
 	int gpio = offset + 1;
-	int base = pct->irq_base;
+	int hwirq;
 	int i;
 
 	for (i = 0; i < pct->irq_cluster_size; i++) {
 		struct abx500_gpio_irq_cluster *cluster =
 			&pct->irq_cluster[i];
 
-		if (gpio >= cluster->start && gpio <= cluster->end)
-			return base + gpio - cluster->start;
+		if (gpio >= cluster->start && gpio <= cluster->end) {
+			/*
+			 * The ABx500 GPIO's associated IRQs are clustered together
+			 * throughout the interrupt numbers at irregular intervals.
+			 * To solve this quandry, we have placed the read-in values
+			 * into the cluster information table.
+			 */
+			hwirq = gpio + cluster->to_irq;
 
-		/* Advance by the number of gpios in this cluster */
-		base += cluster->end + cluster->offset - cluster->start + 1;
+			return irq_create_mapping(pct->parent->domain, hwirq);
+		}
 	}
 
 	return -EINVAL;
@@ -876,7 +881,6 @@ static int abx500_gpio_probe(struct platform_device *pdev)
 	pct->chip = abx500gpio_chip;
 	pct->chip.dev = &pdev->dev;
 	pct->chip.base = pdata->gpio_base;
-	pct->irq_base = pdata->irq_base;
 	pct->chip.base = (np) ? -1 : pdata->gpio_base;
 
 	/* initialize the lock */

drivers/pinctrl/pinctrl-abx500.h

@@ -98,22 +98,24 @@ struct pullud {
 {					\
 	.start = a,			\
 	.end = b,			\
-	.offset = c,			\
+	.to_irq = c,			\
 }
 
 /**
  * struct abx500_gpio_irq_cluster - indicates GPIOs which are interrupt
  *			capable
  * @start:		The pin number of the first pin interrupt capable
  * @end:		The pin number of the last pin interrupt capable
- * @offset:		offset used to compute specific setting strategy of
- *			the interrupt line
+ * @to_irq:		The ABx500 GPIO's associated IRQs are clustered
+ *                      together throughout the interrupt numbers at irregular
+ *                      intervals. To solve this quandary, we will place the
+ *                      read-in values into the cluster information table
  */
 
 struct abx500_gpio_irq_cluster {
 	int start;
 	int end;
-	int offset;
+	int to_irq;
 };
 
 /**