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145 lines
4.2 KiB
145 lines
4.2 KiB
From c91e8490e45c68ea517f70f24568034b7735e8b9 Mon Sep 17 00:00:00 2001
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From: Sascha Hauer <s.hauer@pengutronix.de>
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Date: Thu, 23 Apr 2015 10:35:40 +0200
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Subject: [PATCH 03/76] clk: mediatek: Add reset controller support
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The pericfg and infracfg units also provide reset lines to several
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other SoC internal units. This adds a function which can be called
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from the pericfg and infracfg initialization functions which will
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register the reset controller using reset_controller_register. The
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reset controller will provide support for resetting the units
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connected to the pericfg and infracfg controller. The units resetted
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by this controller can use the standard reset device tree binding
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to gain access to the reset lines.
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Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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Acked-by: Philipp Zabel <p.zabel@pengutronix.de>
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---
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drivers/clk/mediatek/Makefile | 1 +
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drivers/clk/mediatek/clk-mtk.h | 10 +++++
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drivers/clk/mediatek/reset.c | 97 ++++++++++++++++++++++++++++++++++++++++
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3 files changed, 108 insertions(+)
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create mode 100644 drivers/clk/mediatek/reset.c
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--- a/drivers/clk/mediatek/Makefile
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+++ b/drivers/clk/mediatek/Makefile
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@@ -1 +1,2 @@
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obj-y += clk-mtk.o clk-pll.o clk-gate.o
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+obj-$(CONFIG_RESET_CONTROLLER) += reset.o
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--- a/drivers/clk/mediatek/clk-mtk.h
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+++ b/drivers/clk/mediatek/clk-mtk.h
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@@ -156,4 +156,14 @@ void __init mtk_clk_register_plls(struct
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const struct mtk_pll_data *plls, int num_plls,
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struct clk_onecell_data *clk_data);
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+#ifdef CONFIG_RESET_CONTROLLER
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+void mtk_register_reset_controller(struct device_node *np,
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+ unsigned int num_regs, int regofs);
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+#else
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+static inline void mtk_register_reset_controller(struct device_node *np,
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+ unsigned int num_regs, int regofs)
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+{
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+}
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+#endif
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+
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#endif /* __DRV_CLK_MTK_H */
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--- /dev/null
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+++ b/drivers/clk/mediatek/reset.c
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@@ -0,0 +1,97 @@
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+/*
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+ * Copyright (c) 2014 MediaTek Inc.
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License version 2 as
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+ * published by the Free Software Foundation.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ */
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+
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+#include <linux/mfd/syscon.h>
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+#include <linux/module.h>
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+#include <linux/of.h>
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+#include <linux/platform_device.h>
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+#include <linux/regmap.h>
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+#include <linux/reset-controller.h>
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+#include <linux/slab.h>
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+
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+#include "clk-mtk.h"
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+
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+struct mtk_reset {
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+ struct regmap *regmap;
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+ int regofs;
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+ struct reset_controller_dev rcdev;
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+};
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+
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+static int mtk_reset_assert(struct reset_controller_dev *rcdev,
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+ unsigned long id)
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+{
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+ struct mtk_reset *data = container_of(rcdev, struct mtk_reset, rcdev);
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+
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+ return regmap_update_bits(data->regmap, data->regofs + ((id / 32) << 2),
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+ BIT(id % 32), ~0);
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+}
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+
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+static int mtk_reset_deassert(struct reset_controller_dev *rcdev,
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+ unsigned long id)
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+{
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+ struct mtk_reset *data = container_of(rcdev, struct mtk_reset, rcdev);
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+
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+ return regmap_update_bits(data->regmap, data->regofs + ((id / 32) << 2),
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+ BIT(id % 32), 0);
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+}
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+
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+static int mtk_reset(struct reset_controller_dev *rcdev,
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+ unsigned long id)
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+{
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+ int ret;
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+
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+ ret = mtk_reset_assert(rcdev, id);
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+ if (ret)
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+ return ret;
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+
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+ return mtk_reset_deassert(rcdev, id);
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+}
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+
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+static struct reset_control_ops mtk_reset_ops = {
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+ .assert = mtk_reset_assert,
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+ .deassert = mtk_reset_deassert,
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+ .reset = mtk_reset,
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+};
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+
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+void mtk_register_reset_controller(struct device_node *np,
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+ unsigned int num_regs, int regofs)
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+{
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+ struct mtk_reset *data;
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+ int ret;
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+ struct regmap *regmap;
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+
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+ regmap = syscon_node_to_regmap(np);
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+ if (IS_ERR(regmap)) {
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+ pr_err("Cannot find regmap for %s: %ld\n", np->full_name,
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+ PTR_ERR(regmap));
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+ return;
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+ }
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+
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+ data = kzalloc(sizeof(*data), GFP_KERNEL);
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+ if (!data)
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+ return;
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+
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+ data->regmap = regmap;
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+ data->regofs = regofs;
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+ data->rcdev.owner = THIS_MODULE;
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+ data->rcdev.nr_resets = num_regs * 32;
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+ data->rcdev.ops = &mtk_reset_ops;
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+ data->rcdev.of_node = np;
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+
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+ ret = reset_controller_register(&data->rcdev);
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+ if (ret) {
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+ pr_err("could not register reset controller: %d\n", ret);
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+ kfree(data);
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+ return;
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+ }
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+}
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