reset: add support for the Meson-A1 SoC Reset Controller (bdb369e1) · Commits · 戴 / test

drivers/reset/reset-meson.c

+28 −7

Original line number	Diff line number	Diff line
		@@ -15,12 +15,16 @@
		#include <linux/types.h>
		#include <linux/of_device.h>

		#define REG_COUNT 8
		#define BITS_PER_REG 32
		#define LEVEL_OFFSET 0x7c

		struct meson_reset_param {
		int reg_count;
		int level_offset;
		};

		struct meson_reset {
		void __iomem *reg_base;
		const struct meson_reset_param *param;
		struct reset_controller_dev rcdev;
		spinlock_t lock;
		};
		@@ -46,10 +50,12 @@ static int meson_reset_level(struct reset_controller_dev *rcdev,
		container_of(rcdev, struct meson_reset, rcdev);
		unsigned int bank = id / BITS_PER_REG;
		unsigned int offset = id % BITS_PER_REG;
		void __iomem *reg_addr = data->reg_base + LEVEL_OFFSET + (bank << 2);
		void __iomem *reg_addr;
		unsigned long flags;
		u32 reg;

		reg_addr = data->reg_base + data->param->level_offset + (bank << 2);

		spin_lock_irqsave(&data->lock, flags);

		reg = readl(reg_addr);
		@@ -81,10 +87,21 @@ static const struct reset_control_ops meson_reset_ops = {
		.deassert = meson_reset_deassert,
		};

		static const struct meson_reset_param meson8b_param = {
		.reg_count = 8,
		.level_offset = 0x7c,
		};

		static const struct meson_reset_param meson_a1_param = {
		.reg_count = 3,
		.level_offset = 0x40,
		};

		static const struct of_device_id meson_reset_dt_ids[] = {
		{ .compatible = "amlogic,meson8b-reset" },
		{ .compatible = "amlogic,meson-gxbb-reset" },
		{ .compatible = "amlogic,meson-axg-reset" },
		{ .compatible = "amlogic,meson8b-reset", .data = &meson8b_param},
		{ .compatible = "amlogic,meson-gxbb-reset", .data = &meson8b_param},
		{ .compatible = "amlogic,meson-axg-reset", .data = &meson8b_param},
		{ .compatible = "amlogic,meson-a1-reset", .data = &meson_a1_param},
		{ /* sentinel */ },
		};

		@@ -102,12 +119,16 @@ static int meson_reset_probe(struct platform_device *pdev)
		if (IS_ERR(data->reg_base))
		return PTR_ERR(data->reg_base);

		data->param = of_device_get_match_data(&pdev->dev);
		if (!data->param)
		return -ENODEV;

		platform_set_drvdata(pdev, data);

		spin_lock_init(&data->lock);

		data->rcdev.owner = THIS_MODULE;
		data->rcdev.nr_resets = REG_COUNT * BITS_PER_REG;
		data->rcdev.nr_resets = data->param->reg_count * BITS_PER_REG;
		data->rcdev.ops = &meson_reset_ops;
		data->rcdev.of_node = pdev->dev.of_node;

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