pinctrl: cherryview: Introduce helpers to IO with common registers

Pin control device and effectively the single community in it has
a set of common registers. It's good to have a helpers to IO on them.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>

drivers/pinctrl/intel/pinctrl-cherryview.c

@@ -598,6 +598,20 @@ static const struct chv_community *chv_communities[] = {
  */
 static DEFINE_RAW_SPINLOCK(chv_lock);
 
+static u32 chv_pctrl_readl(struct chv_pinctrl *pctrl, unsigned int offset)
+{
+	return readl(pctrl->regs + offset);
+}
+
+static void chv_pctrl_writel(struct chv_pinctrl *pctrl, unsigned int offset, u32 value)
+{
+	void __iomem *reg = pctrl->regs + offset;
+
+	/* Write and simple read back to confirm the bus transferring done */
+	writel(value, reg);
+	readl(reg);
+}
+
 static void __iomem *chv_padreg(struct chv_pinctrl *pctrl, unsigned int offset,
 				unsigned int reg)
 {
@@ -1264,7 +1278,7 @@ static void chv_gpio_irq_ack(struct irq_data *d)
 	intr_line = chv_readl(pctrl, pin, CHV_PADCTRL0);
 	intr_line &= CHV_PADCTRL0_INTSEL_MASK;
 	intr_line >>= CHV_PADCTRL0_INTSEL_SHIFT;
-	chv_writel(BIT(intr_line), pctrl->regs + CHV_INTSTAT);
+	chv_pctrl_writel(pctrl, CHV_INTSTAT, BIT(intr_line));
 
 	raw_spin_unlock(&chv_lock);
 }
@@ -1283,12 +1297,12 @@ static void chv_gpio_irq_mask_unmask(struct irq_data *d, bool mask)
 	intr_line &= CHV_PADCTRL0_INTSEL_MASK;
 	intr_line >>= CHV_PADCTRL0_INTSEL_SHIFT;
 
-	value = readl(pctrl->regs + CHV_INTMASK);
+	value = chv_pctrl_readl(pctrl, CHV_INTMASK);
 	if (mask)
 		value &= ~BIT(intr_line);
 	else
 		value |= BIT(intr_line);
-	chv_writel(value, pctrl->regs + CHV_INTMASK);
+	chv_pctrl_writel(pctrl, CHV_INTMASK, value);
 
 	raw_spin_unlock_irqrestore(&chv_lock, flags);
 }
@@ -1419,7 +1433,7 @@ static void chv_gpio_irq_handler(struct irq_desc *desc)
 	chained_irq_enter(chip, desc);
 
 	raw_spin_lock_irqsave(&chv_lock, flags);
-	pending = readl(pctrl->regs + CHV_INTSTAT);
+	pending = chv_pctrl_readl(pctrl, CHV_INTSTAT);
 	raw_spin_unlock_irqrestore(&chv_lock, flags);
 
 	for_each_set_bit(intr_line, &pending, pctrl->community->nirqs) {
@@ -1514,12 +1528,11 @@ static int chv_gpio_irq_init_hw(struct gpio_chip *chip)
 		 * Mask all interrupts the community is able to generate
 		 * but leave the ones that can only generate GPEs unmasked.
 		 */
-		chv_writel(GENMASK(31, pctrl->community->nirqs),
-			   pctrl->regs + CHV_INTMASK);
+		chv_pctrl_writel(pctrl, CHV_INTMASK, GENMASK(31, pctrl->community->nirqs));
 	}
 
 	/* Clear all interrupts */
-	chv_writel(0xffff, pctrl->regs + CHV_INTSTAT);
+	chv_pctrl_writel(pctrl, CHV_INTSTAT, 0xffff);
 
 	return 0;
 }
@@ -1618,9 +1631,9 @@ static acpi_status chv_pinctrl_mmio_access_handler(u32 function,
 	raw_spin_lock_irqsave(&chv_lock, flags);
 
 	if (function == ACPI_WRITE)
-		chv_writel((u32)(*value), pctrl->regs + (u32)address);
+		chv_pctrl_writel(pctrl, address, *value);
 	else if (function == ACPI_READ)
-		*value = readl(pctrl->regs + (u32)address);
+		*value = chv_pctrl_readl(pctrl, address);
 	else
 		ret = AE_BAD_PARAMETER;
 
@@ -1718,7 +1731,7 @@ static int chv_pinctrl_suspend_noirq(struct device *dev)
 
 	raw_spin_lock_irqsave(&chv_lock, flags);
 
-	pctrl->saved_intmask = readl(pctrl->regs + CHV_INTMASK);
+	pctrl->saved_intmask = chv_pctrl_readl(pctrl, CHV_INTMASK);
 
 	for (i = 0; i < pctrl->community->npins; i++) {
 		const struct pinctrl_pin_desc *desc;
@@ -1754,7 +1767,7 @@ static int chv_pinctrl_resume_noirq(struct device *dev)
 	 * registers because we don't know in which state BIOS left them
 	 * upon exiting suspend.
 	 */
-	chv_writel(0, pctrl->regs + CHV_INTMASK);
+	chv_pctrl_writel(pctrl, CHV_INTMASK, 0x0000);
 
 	for (i = 0; i < pctrl->community->npins; i++) {
 		const struct pinctrl_pin_desc *desc;
@@ -1791,8 +1804,8 @@ static int chv_pinctrl_resume_noirq(struct device *dev)
 	 * Now that all pins are restored to known state, we can restore
 	 * the interrupt mask register as well.
 	 */
-	chv_writel(0xffff, pctrl->regs + CHV_INTSTAT);
-	chv_writel(pctrl->saved_intmask, pctrl->regs + CHV_INTMASK);
+	chv_pctrl_writel(pctrl, CHV_INTSTAT, 0xffff);
+	chv_pctrl_writel(pctrl, CHV_INTMASK, pctrl->saved_intmask);
 
 	raw_spin_unlock_irqrestore(&chv_lock, flags);