[PATCH 06/17] irqchip/irq-mvebu-icu: switch to regmap

[Miquel Raynal <miquel.raynal@bootlin.com>]

The ICU DT nodes have now the 'syscon' compatible, we can switch to
regmap before splitting the code to support multiple platform devices to
be probed (one for the ICU, one per interrupt group).

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
---
 drivers/irqchip/irq-mvebu-icu.c | 37 ++++++++++++++++++++-----------------
 1 file changed, 20 insertions(+), 17 deletions(-)

diff --git a/drivers/irqchip/irq-mvebu-icu.c b/drivers/irqchip/irq-mvebu-icu.c
index 5af2520445c4..580586240781 100644
--- a/drivers/irqchip/irq-mvebu-icu.c
+++ b/drivers/irqchip/irq-mvebu-icu.c
@@ -18,6 +18,8 @@
 #include <linux/of_irq.h>
 #include <linux/of_platform.h>
 #include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/mfd/syscon.h>
 
 #include <dt-bindings/interrupt-controller/mvebu-icu.h>
 
@@ -40,7 +42,7 @@
 
 struct mvebu_icu {
 	struct irq_chip irq_chip;
-	void __iomem *base;
+	struct regmap *regmap;
 	struct irq_domain *domain;
 	struct device *dev;
 };
@@ -69,7 +71,7 @@ static void mvebu_icu_write_msg(struct msi_desc *desc, struct msi_msg *msg)
 		icu_int = 0;
 	}
 
-	writel_relaxed(icu_int, icu->base + ICU_INT_CFG(d->hwirq));
+	regmap_write(icu->regmap, ICU_INT_CFG(d->hwirq), icu_int);
 
 	/*
 	 * The SATA unit has 2 ports, and a dedicated ICU entry per
@@ -81,10 +83,10 @@ static void mvebu_icu_write_msg(struct msi_desc *desc, struct msi_msg *msg)
 	 * configured (regardless of which port is actually in use).
 	 */
 	if (d->hwirq == ICU_SATA0_ICU_ID || d->hwirq == ICU_SATA1_ICU_ID) {
-		writel_relaxed(icu_int,
-			       icu->base + ICU_INT_CFG(ICU_SATA0_ICU_ID));
-		writel_relaxed(icu_int,
-			       icu->base + ICU_INT_CFG(ICU_SATA1_ICU_ID));
+		regmap_write(icu->regmap, ICU_INT_CFG(ICU_SATA0_ICU_ID),
+			     icu_int);
+		regmap_write(icu->regmap, ICU_INT_CFG(ICU_SATA1_ICU_ID),
+			     icu_int);
 	}
 }
 
@@ -208,12 +210,13 @@ static int mvebu_icu_probe(struct platform_device *pdev)
 
 	icu->dev = &pdev->dev;
 
+	icu->regmap = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, NULL);
+	if (IS_ERR(icu->regmap))
+		return PTR_ERR(icu->regmap);
+
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	icu->base = devm_ioremap_resource(&pdev->dev, res);
-	if (IS_ERR(icu->base)) {
-		dev_err(&pdev->dev, "Failed to map icu base address.\n");
-		return PTR_ERR(icu->base);
-	}
+	if (!res)
+		return -ENODEV;
 
 	icu->irq_chip.name = devm_kasprintf(&pdev->dev, GFP_KERNEL,
 					    "ICU.%x",
@@ -247,10 +250,10 @@ static int mvebu_icu_probe(struct platform_device *pdev)
 		return ret;
 
 	/* Set Clear/Set ICU SPI message address in AP */
-	writel_relaxed(upper_32_bits(setspi), icu->base + ICU_SETSPI_NSR_AH);
-	writel_relaxed(lower_32_bits(setspi), icu->base + ICU_SETSPI_NSR_AL);
-	writel_relaxed(upper_32_bits(clrspi), icu->base + ICU_CLRSPI_NSR_AH);
-	writel_relaxed(lower_32_bits(clrspi), icu->base + ICU_CLRSPI_NSR_AL);
+	regmap_write(icu->regmap, ICU_SETSPI_NSR_AH, upper_32_bits(setspi));
+	regmap_write(icu->regmap, ICU_SETSPI_NSR_AL, lower_32_bits(setspi));
+	regmap_write(icu->regmap, ICU_CLRSPI_NSR_AH, upper_32_bits(clrspi));
+	regmap_write(icu->regmap, ICU_CLRSPI_NSR_AL, lower_32_bits(clrspi));
 
 	/*
 	 * Clean all ICU interrupts with type SPI_NSR, required to
@@ -259,11 +262,11 @@ static int mvebu_icu_probe(struct platform_device *pdev)
 	for (i = 0 ; i < ICU_MAX_IRQS ; i++) {
 		u32 icu_int, icu_grp;
 
-		icu_int = readl(icu->base + ICU_INT_CFG(i));
+		regmap_read(icu->regmap, ICU_INT_CFG(i), &icu_int);
 		icu_grp = icu_int >> ICU_GROUP_SHIFT;
 
 		if (icu_grp == ICU_GRP_NSR)
-			writel_relaxed(0x0, icu->base + ICU_INT_CFG(i));
+			regmap_write(icu->regmap, ICU_INT_CFG(i), 0);
 	}
 
 	icu->domain =
-- 
2.14.1