gpio: wcove: Split out to_ireg() helper and deduplicate the code

There are a few places in the code where IRQ status and mask register
values are being updated. Use a new exctracted helper to deduplicate
the code.

While at it, get rid of unnecessary divisions.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

drivers/gpio/gpio-wcove.c

@@ -73,6 +73,8 @@
 enum ctrl_register {
 	CTRL_IN,
 	CTRL_OUT,
+	IRQ_STATUS,
+	IRQ_MASK,
 };
 
 /*
@@ -112,18 +114,25 @@ static inline int to_reg(int gpio, enum ctrl_register reg_type)
 	return reg;
 }
 
-static void wcove_update_irq_mask(struct wcove_gpio *wg, int gpio)
+static inline int to_ireg(int gpio, enum ctrl_register type, unsigned int *mask)
 {
-	unsigned int reg, mask;
+	unsigned int reg = type == IRQ_STATUS ? IRQ_STATUS_BASE : IRQ_MASK_BASE;
 
 	if (gpio < GROUP0_NR_IRQS) {
-		reg = IRQ_MASK_BASE;
-		mask = BIT(gpio % GROUP0_NR_IRQS);
+		reg += 0;
+		*mask = BIT(gpio);
 	} else {
-		reg = IRQ_MASK_BASE + 1;
-		mask = BIT((gpio - GROUP0_NR_IRQS) % GROUP1_NR_IRQS);
+		reg += 1;
+		*mask = BIT(gpio - GROUP0_NR_IRQS);
 	}
 
+	return reg;
+}
+
+static void wcove_update_irq_mask(struct wcove_gpio *wg, int gpio)
+{
+	unsigned int mask, reg = to_ireg(gpio, IRQ_MASK, &mask);
+
 	if (wg->set_irq_mask)
 		regmap_set_bits(wg->regmap, reg, mask);
 	else
@@ -324,7 +333,7 @@ static struct irq_chip wcove_irqchip = {
 static irqreturn_t wcove_gpio_irq_handler(int irq, void *data)
 {
 	struct wcove_gpio *wg = (struct wcove_gpio *)data;
-	unsigned int virq, gpio, mask, offset;
+	unsigned int virq, gpio;
 	unsigned long pending;
 	u8 p[2];
 
@@ -341,12 +350,11 @@ static irqreturn_t wcove_gpio_irq_handler(int irq, void *data)
 	while (pending) {
 		/* One iteration is for all pending bits */
 		for_each_set_bit(gpio, &pending, WCOVE_GPIO_NUM) {
-			offset = (gpio > GROUP0_NR_IRQS) ? 1 : 0;
-			mask = (offset == 1) ? BIT(gpio - GROUP0_NR_IRQS) :
-								BIT(gpio);
+			unsigned int mask, reg = to_ireg(gpio, IRQ_STATUS, &mask);
+
 			virq = irq_find_mapping(wg->chip.irq.domain, gpio);
 			handle_nested_irq(virq);
-			regmap_set_bits(wg->regmap, IRQ_STATUS_BASE + offset, mask);
+			regmap_set_bits(wg->regmap, reg, mask);
 		}
 
 		/* Next iteration */
@@ -366,30 +374,26 @@ static void wcove_gpio_dbg_show(struct seq_file *s,
 {
 	unsigned int ctlo, ctli, irq_mask, irq_status;
 	struct wcove_gpio *wg = gpiochip_get_data(chip);
-	int gpio, offset, group, ret = 0;
+	int gpio, mask, ret = 0;
 
 	for (gpio = 0; gpio < WCOVE_GPIO_NUM; gpio++) {
-		group = gpio < GROUP0_NR_IRQS ? 0 : 1;
 		ret += regmap_read(wg->regmap, to_reg(gpio, CTRL_OUT), &ctlo);
 		ret += regmap_read(wg->regmap, to_reg(gpio, CTRL_IN), &ctli);
-		ret += regmap_read(wg->regmap, IRQ_MASK_BASE + group,
-							&irq_mask);
-		ret += regmap_read(wg->regmap, IRQ_STATUS_BASE + group,
-							&irq_status);
+		ret += regmap_read(wg->regmap, to_ireg(gpio, IRQ_MASK, &mask), &irq_mask);
+		ret += regmap_read(wg->regmap, to_ireg(gpio, IRQ_STATUS, &mask), &irq_status);
 		if (ret) {
 			pr_err("Failed to read registers: ctrl out/in or irq status/mask\n");
 			break;
 		}
 
-		offset = gpio % 8;
 		seq_printf(s, " gpio-%-2d %s %s %s %s ctlo=%2x,%s %s\n",
 			   gpio, ctlo & CTLO_DIR_OUT ? "out" : "in ",
 			   ctli & 0x1 ? "hi" : "lo",
 			   ctli & CTLI_INTCNT_NE ? "fall" : "    ",
 			   ctli & CTLI_INTCNT_PE ? "rise" : "    ",
 			   ctlo,
-			   irq_mask & BIT(offset) ? "mask  " : "unmask",
-			   irq_status & BIT(offset) ? "pending" : "       ");
+			   irq_mask & mask ? "mask  " : "unmask",
+			   irq_status & mask ? "pending" : "       ");
 	}
 }