media: rc: meson-ir: support MMIO regmaps to access registers

Supports MMIO regmaps to access controller registers in Meson IR driver.
Signed-off-by: Zelong Dong <zelong.dong@amlogic.com>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/media/rc/Kconfig

@@ -274,6 +274,7 @@ config IR_MCEUSB
 config IR_MESON
 	tristate "Amlogic Meson IR remote receiver"
 	depends on ARCH_MESON || COMPILE_TEST
+	select REGMAP_MMIO
 	help
 	   Say Y if you want to use the IR remote receiver available
 	   on Amlogic Meson SoCs.

drivers/media/rc/meson-ir.c

@@ -14,6 +14,7 @@
 #include <linux/platform_device.h>
 #include <linux/spinlock.h>
 #include <linux/bitfield.h>
+#include <linux/regmap.h>
 
 #include <media/rc-core.h>
 
@@ -50,21 +51,16 @@
 #define MESON_HW_TRATE		20	/* us */
 
 struct meson_ir {
-	void __iomem	*reg;
+	struct regmap	*reg;
 	struct rc_dev	*rc;
 	spinlock_t	lock;
 };
 
-static void meson_ir_set_mask(struct meson_ir *ir, unsigned int reg,
-			      u32 mask, u32 value)
-{
-	u32 data;
-
-	data = readl(ir->reg + reg);
-	data &= ~mask;
-	data |= (value & mask);
-	writel(data, ir->reg + reg);
-}
+static const struct regmap_config meson_ir_regmap_config = {
+	.reg_bits = 32,
+	.val_bits = 32,
+	.reg_stride = 4,
+};
 
 static irqreturn_t meson_ir_irq(int irqno, void *dev_id)
 {
@@ -74,11 +70,11 @@ static irqreturn_t meson_ir_irq(int irqno, void *dev_id)
 
 	spin_lock(&ir->lock);
 
-	duration = readl_relaxed(ir->reg + IR_DEC_REG1);
+	regmap_read(ir->reg, IR_DEC_REG1, &duration);
 	duration = FIELD_GET(IR_DEC_REG1_TIME_IV, duration);
 	rawir.duration = duration * MESON_RAW_TRATE;
 
-	status = readl_relaxed(ir->reg + IR_DEC_STATUS);
+	regmap_read(ir->reg, IR_DEC_STATUS, &status);
 	rawir.pulse = !!(status & IR_DEC_STATUS_PULSE);
 
 	ir_raw_event_store_with_timeout(ir->rc, &rawir);
@@ -92,6 +88,7 @@ static int meson_ir_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct device_node *node = dev->of_node;
+	void __iomem *res_start;
 	const char *map_name;
 	struct meson_ir *ir;
 	int irq, ret;
@@ -100,7 +97,12 @@ static int meson_ir_probe(struct platform_device *pdev)
 	if (!ir)
 		return -ENOMEM;
 
-	ir->reg = devm_platform_ioremap_resource(pdev, 0);
+	res_start = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(res_start))
+		return PTR_ERR(res_start);
+
+	ir->reg = devm_regmap_init_mmio(&pdev->dev, res_start,
+					&meson_ir_regmap_config);
 	if (IS_ERR(ir->reg))
 		return PTR_ERR(ir->reg);
 
@@ -143,27 +145,28 @@ static int meson_ir_probe(struct platform_device *pdev)
 	}
 
 	/* Reset the decoder */
-	meson_ir_set_mask(ir, IR_DEC_REG1, IR_DEC_REG1_RESET,
-			  IR_DEC_REG1_RESET);
-	meson_ir_set_mask(ir, IR_DEC_REG1, IR_DEC_REG1_RESET, 0);
+	regmap_update_bits(ir->reg, IR_DEC_REG1, IR_DEC_REG1_RESET,
+			   IR_DEC_REG1_RESET);
+	regmap_update_bits(ir->reg, IR_DEC_REG1, IR_DEC_REG1_RESET, 0);
 
 	/* Set general operation mode (= raw/software decoding) */
 	if (of_device_is_compatible(node, "amlogic,meson6-ir"))
-		meson_ir_set_mask(ir, IR_DEC_REG1, IR_DEC_REG1_MODE,
-				  FIELD_PREP(IR_DEC_REG1_MODE, DEC_MODE_RAW));
+		regmap_update_bits(ir->reg, IR_DEC_REG1, IR_DEC_REG1_MODE,
+				   FIELD_PREP(IR_DEC_REG1_MODE, DEC_MODE_RAW));
 	else
-		meson_ir_set_mask(ir, IR_DEC_REG2, IR_DEC_REG2_MODE,
-				  FIELD_PREP(IR_DEC_REG2_MODE, DEC_MODE_RAW));
+		regmap_update_bits(ir->reg, IR_DEC_REG2, IR_DEC_REG2_MODE,
+				   FIELD_PREP(IR_DEC_REG2_MODE, DEC_MODE_RAW));
 
 	/* Set rate */
-	meson_ir_set_mask(ir, IR_DEC_REG0, IR_DEC_REG0_BASE_TIME,
-			  MESON_RAW_TRATE - 1);
+	regmap_update_bits(ir->reg, IR_DEC_REG0, IR_DEC_REG0_BASE_TIME,
+			   FIELD_PREP(IR_DEC_REG0_BASE_TIME,
+				      MESON_RAW_TRATE - 1));
 	/* IRQ on rising and falling edges */
-	meson_ir_set_mask(ir, IR_DEC_REG1, IR_DEC_REG1_IRQSEL,
-			  FIELD_PREP(IR_DEC_REG1_IRQSEL, IRQSEL_RISE_FALL));
+	regmap_update_bits(ir->reg, IR_DEC_REG1, IR_DEC_REG1_IRQSEL,
+			   FIELD_PREP(IR_DEC_REG1_IRQSEL, IRQSEL_RISE_FALL));
 	/* Enable the decoder */
-	meson_ir_set_mask(ir, IR_DEC_REG1, IR_DEC_REG1_ENABLE,
-			  IR_DEC_REG1_ENABLE);
+	regmap_update_bits(ir->reg, IR_DEC_REG1, IR_DEC_REG1_ENABLE,
+			   IR_DEC_REG1_ENABLE);
 
 	dev_info(dev, "receiver initialized\n");
 
@@ -177,7 +180,7 @@ static void meson_ir_remove(struct platform_device *pdev)
 
 	/* Disable the decoder */
 	spin_lock_irqsave(&ir->lock, flags);
-	meson_ir_set_mask(ir, IR_DEC_REG1, IR_DEC_REG1_ENABLE, 0);
+	regmap_update_bits(ir->reg, IR_DEC_REG1, IR_DEC_REG1_ENABLE, 0);
 	spin_unlock_irqrestore(&ir->lock, flags);
 }
 
@@ -195,15 +198,16 @@ static void meson_ir_shutdown(struct platform_device *pdev)
 	 * bootloader a chance to power the system back on
 	 */
 	if (of_device_is_compatible(node, "amlogic,meson6-ir"))
-		meson_ir_set_mask(ir, IR_DEC_REG1, IR_DEC_REG1_MODE,
-				  FIELD_PREP(IR_DEC_REG1_MODE, DEC_MODE_NEC));
+		regmap_update_bits(ir->reg, IR_DEC_REG1, IR_DEC_REG1_MODE,
+				   FIELD_PREP(IR_DEC_REG1_MODE, DEC_MODE_NEC));
 	else
-		meson_ir_set_mask(ir, IR_DEC_REG2, IR_DEC_REG2_MODE,
-				  FIELD_PREP(IR_DEC_REG2_MODE, DEC_MODE_NEC));
+		regmap_update_bits(ir->reg, IR_DEC_REG2, IR_DEC_REG2_MODE,
+				   FIELD_PREP(IR_DEC_REG2_MODE, DEC_MODE_NEC));
 
 	/* Set rate to default value */
-	meson_ir_set_mask(ir, IR_DEC_REG0, IR_DEC_REG0_BASE_TIME,
-			  MESON_HW_TRATE - 1);
+	regmap_update_bits(ir->reg, IR_DEC_REG0, IR_DEC_REG0_BASE_TIME,
+			   FIELD_PREP(IR_DEC_REG0_BASE_TIME,
+				      MESON_HW_TRATE - 1));
 
 	spin_unlock_irqrestore(&ir->lock, flags);
 }