reset: starfive: Extract the common JH71X0 reset code

Extract the common JH71X0 reset code for reusing them to
support JH7110 SoC.
Tested-by: Tommaso Merciai <tomm.merciai@gmail.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Emil Renner Berthing <emil.renner.berthing@canonical.com>
Signed-off-by: Emil Renner Berthing <kernel@esmil.dk>
Signed-off-by: Hal Feng <hal.feng@starfivetech.com>
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>

drivers/reset/starfive/reset-starfive-jh7100.c

@@ -10,6 +10,55 @@
 
 #include "reset-starfive-jh71x0.h"
 
+#include <dt-bindings/reset/starfive-jh7100.h>
+
+/* register offsets */
+#define JH7100_RESET_ASSERT0	0x00
+#define JH7100_RESET_ASSERT1	0x04
+#define JH7100_RESET_ASSERT2	0x08
+#define JH7100_RESET_ASSERT3	0x0c
+#define JH7100_RESET_STATUS0	0x10
+#define JH7100_RESET_STATUS1	0x14
+#define JH7100_RESET_STATUS2	0x18
+#define JH7100_RESET_STATUS3	0x1c
+
+/*
+ * Writing a 1 to the n'th bit of the m'th ASSERT register asserts
+ * line 32m + n, and writing a 0 deasserts the same line.
+ * Most reset lines have their status inverted so a 0 bit in the STATUS
+ * register means the line is asserted and a 1 means it's deasserted. A few
+ * lines don't though, so store the expected value of the status registers when
+ * all lines are asserted.
+ */
+static const u64 jh7100_reset_asserted[2] = {
+	/* STATUS0 */
+	BIT_ULL_MASK(JH7100_RST_U74) |
+	BIT_ULL_MASK(JH7100_RST_VP6_DRESET) |
+	BIT_ULL_MASK(JH7100_RST_VP6_BRESET) |
+	/* STATUS1 */
+	BIT_ULL_MASK(JH7100_RST_HIFI4_DRESET) |
+	BIT_ULL_MASK(JH7100_RST_HIFI4_BRESET),
+	/* STATUS2 */
+	BIT_ULL_MASK(JH7100_RST_E24) |
+	/* STATUS3 */
+	0,
+};
+
+static int __init jh7100_reset_probe(struct platform_device *pdev)
+{
+	void __iomem *base = devm_platform_ioremap_resource(pdev, 0);
+
+	if (IS_ERR(base))
+		return PTR_ERR(base);
+
+	return reset_starfive_jh7100_register(&pdev->dev, pdev->dev.of_node,
+					      base + JH7100_RESET_ASSERT0,
+					      base + JH7100_RESET_STATUS0,
+					      jh7100_reset_asserted,
+					      JH7100_RSTN_END,
+					      THIS_MODULE);
+}
+
 static const struct of_device_id jh7100_reset_dt_ids[] = {
 	{ .compatible = "starfive,jh7100-reset" },
 	{ /* sentinel */ }

drivers/reset/starfive/reset-starfive-jh71x0.c

@@ -10,51 +10,18 @@
 #include <linux/io.h>
 #include <linux/io-64-nonatomic-lo-hi.h>
 #include <linux/iopoll.h>
-#include <linux/platform_device.h>
 #include <linux/reset-controller.h>
 #include <linux/spinlock.h>
 
 #include "reset-starfive-jh71x0.h"
 
-#include <dt-bindings/reset/starfive-jh7100.h>
-
-/* register offsets */
-#define JH7100_RESET_ASSERT0	0x00
-#define JH7100_RESET_ASSERT1	0x04
-#define JH7100_RESET_ASSERT2	0x08
-#define JH7100_RESET_ASSERT3	0x0c
-#define JH7100_RESET_STATUS0	0x10
-#define JH7100_RESET_STATUS1	0x14
-#define JH7100_RESET_STATUS2	0x18
-#define JH7100_RESET_STATUS3	0x1c
-
-/*
- * Writing a 1 to the n'th bit of the m'th ASSERT register asserts
- * line 32m + n, and writing a 0 deasserts the same line.
- * Most reset lines have their status inverted so a 0 bit in the STATUS
- * register means the line is asserted and a 1 means it's deasserted. A few
- * lines don't though, so store the expected value of the status registers when
- * all lines are asserted.
- */
-static const u64 jh7100_reset_asserted[2] = {
-	/* STATUS0 */
-	BIT_ULL_MASK(JH7100_RST_U74) |
-	BIT_ULL_MASK(JH7100_RST_VP6_DRESET) |
-	BIT_ULL_MASK(JH7100_RST_VP6_BRESET) |
-	/* STATUS1 */
-	BIT_ULL_MASK(JH7100_RST_HIFI4_DRESET) |
-	BIT_ULL_MASK(JH7100_RST_HIFI4_BRESET),
-	/* STATUS2 */
-	BIT_ULL_MASK(JH7100_RST_E24) |
-	/* STATUS3 */
-	0,
-};
-
 struct jh7100_reset {
 	struct reset_controller_dev rcdev;
 	/* protect registers against concurrent read-modify-write */
 	spinlock_t lock;
-	void __iomem *base;
+	void __iomem *assert;
+	void __iomem *status;
+	const u64 *asserted;
 };
 
 static inline struct jh7100_reset *
@@ -69,9 +36,9 @@ static int jh7100_reset_update(struct reset_controller_dev *rcdev,
 	struct jh7100_reset *data = jh7100_reset_from(rcdev);
 	unsigned long offset = BIT_ULL_WORD(id);
 	u64 mask = BIT_ULL_MASK(id);
-	void __iomem *reg_assert = data->base + JH7100_RESET_ASSERT0 + offset * sizeof(u64);
-	void __iomem *reg_status = data->base + JH7100_RESET_STATUS0 + offset * sizeof(u64);
-	u64 done = jh7100_reset_asserted[offset] & mask;
+	void __iomem *reg_assert = data->assert + offset * sizeof(u64);
+	void __iomem *reg_status = data->status + offset * sizeof(u64);
+	u64 done = data->asserted ? data->asserted[offset] & mask : 0;
 	u64 value;
 	unsigned long flags;
 	int ret;
@@ -125,10 +92,10 @@ static int jh7100_reset_status(struct reset_controller_dev *rcdev,
 	struct jh7100_reset *data = jh7100_reset_from(rcdev);
 	unsigned long offset = BIT_ULL_WORD(id);
 	u64 mask = BIT_ULL_MASK(id);
-	void __iomem *reg_status = data->base + JH7100_RESET_STATUS0 + offset * sizeof(u64);
+	void __iomem *reg_status = data->status + offset * sizeof(u64);
 	u64 value = readq(reg_status);
 
-	return !((value ^ jh7100_reset_asserted[offset]) & mask);
+	return !((value ^ data->asserted[offset]) & mask);
 }
 
 static const struct reset_control_ops jh7100_reset_ops = {
@@ -138,25 +105,28 @@ static const struct reset_control_ops jh7100_reset_ops = {
 	.status		= jh7100_reset_status,
 };
 
-int jh7100_reset_probe(struct platform_device *pdev)
+int reset_starfive_jh7100_register(struct device *dev, struct device_node *of_node,
+				   void __iomem *assert, void __iomem *status,
+				   const u64 *asserted, unsigned int nr_resets,
+				   struct module *owner)
 {
 	struct jh7100_reset *data;
 
-	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
+	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
 	if (!data)
 		return -ENOMEM;
 
-	data->base = devm_platform_ioremap_resource(pdev, 0);
-	if (IS_ERR(data->base))
-		return PTR_ERR(data->base);
-
 	data->rcdev.ops = &jh7100_reset_ops;
-	data->rcdev.owner = THIS_MODULE;
-	data->rcdev.nr_resets = JH7100_RSTN_END;
-	data->rcdev.dev = &pdev->dev;
-	data->rcdev.of_node = pdev->dev.of_node;
+	data->rcdev.owner = owner;
+	data->rcdev.nr_resets = nr_resets;
+	data->rcdev.dev = dev;
+	data->rcdev.of_node = of_node;
+
 	spin_lock_init(&data->lock);
+	data->assert = assert;
+	data->status = status;
+	data->asserted = asserted;
 
-	return devm_reset_controller_register(&pdev->dev, &data->rcdev);
+	return devm_reset_controller_register(dev, &data->rcdev);
 }
-EXPORT_SYMBOL_GPL(jh7100_reset_probe);
+EXPORT_SYMBOL_GPL(reset_starfive_jh7100_register);

drivers/reset/starfive/reset-starfive-jh71x0.h

@@ -6,6 +6,9 @@
 #ifndef __RESET_STARFIVE_JH71X0_H
 #define __RESET_STARFIVE_JH71X0_H
 
-int jh7100_reset_probe(struct platform_device *pdev);
+int reset_starfive_jh7100_register(struct device *dev, struct device_node *of_node,
+				   void __iomem *assert, void __iomem *status,
+				   const u64 *asserted, unsigned int nr_resets,
+				   struct module *owner);
 
 #endif /* __RESET_STARFIVE_JH71X0_H */