1 files changed, 94 insertions, 0 deletions
diff --git a/drivers/clk/msm/reset.c b/drivers/clk/msm/reset.c
new file mode 100644
index 000000000000..41e0357aea3e
--- /dev/null
+++ b/drivers/clk/msm/reset.c
@@ -0,0 +1,94 @@
+/*
+ * Copyright (c) 2016, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/device.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/reset-controller.h>
+
+#include "reset.h"
+
+static int msm_reset(struct reset_controller_dev *rcdev, unsigned long id)
+{
+	rcdev->ops->assert(rcdev, id);
+	udelay(1);
+	rcdev->ops->deassert(rcdev, id);
+	return 0;
+}
+
+static int
+msm_reset_assert(struct reset_controller_dev *rcdev, unsigned long id)
+{
+	struct msm_reset_controller *rst;
+	const struct msm_reset_map *map;
+	u32 regval;
+
+	rst = to_msm_reset_controller(rcdev);
+	map = &rst->reset_map[id];
+
+	regval = readl_relaxed(rst->base + map->reg);
+	regval |= BIT(map->bit);
+	writel_relaxed(regval, rst->base + map->reg);
+
+	return 0;
+}
+
+static int
+msm_reset_deassert(struct reset_controller_dev *rcdev, unsigned long id)
+{
+	struct msm_reset_controller *rst;
+	const struct msm_reset_map *map;
+	u32 regval;
+
+	rst = to_msm_reset_controller(rcdev);
+	map = &rst->reset_map[id];
+
+	regval = readl_relaxed(rst->base + map->reg);
+	regval &= ~BIT(map->bit);
+	writel_relaxed(regval, rst->base + map->reg);
+
+	return 0;
+}
+
+struct reset_control_ops msm_reset_ops = {
+	.reset = msm_reset,
+	.assert = msm_reset_assert,
+	.deassert = msm_reset_deassert,
+};
+EXPORT_SYMBOL_GPL(msm_reset_ops);
+
+int msm_reset_controller_register(struct platform_device *pdev,
+	const struct msm_reset_map *map, unsigned int num_resets,
+	void __iomem *virt_base)
+{
+	struct msm_reset_controller *reset;
+	int ret = 0;
+
+	reset = devm_kzalloc(&pdev->dev, sizeof(*reset), GFP_KERNEL);
+	if (!reset)
+		return -ENOMEM;
+
+	reset->rcdev.of_node = pdev->dev.of_node;
+	reset->rcdev.ops = &msm_reset_ops;
+	reset->rcdev.owner = pdev->dev.driver->owner;
+	reset->rcdev.nr_resets = num_resets;
+	reset->reset_map = map;
+	reset->base = virt_base;
+
+	ret = reset_controller_register(&reset->rcdev);
+	if (ret)
+		dev_err(&pdev->dev, "Failed to register with reset controller\n");
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(msm_reset_controller_register);