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-rw-r--r--target/linux/mediatek/patches/0003-clk-mediatek-Add-reset-controller-support.patch155
1 files changed, 155 insertions, 0 deletions
diff --git a/target/linux/mediatek/patches/0003-clk-mediatek-Add-reset-controller-support.patch b/target/linux/mediatek/patches/0003-clk-mediatek-Add-reset-controller-support.patch
new file mode 100644
index 0000000000..bb6f64b9b2
--- /dev/null
+++ b/target/linux/mediatek/patches/0003-clk-mediatek-Add-reset-controller-support.patch
@@ -0,0 +1,155 @@
+From c91e8490e45c68ea517f70f24568034b7735e8b9 Mon Sep 17 00:00:00 2001
+From: Sascha Hauer <s.hauer@pengutronix.de>
+Date: Thu, 23 Apr 2015 10:35:40 +0200
+Subject: [PATCH 03/76] clk: mediatek: Add reset controller support
+
+The pericfg and infracfg units also provide reset lines to several
+other SoC internal units. This adds a function which can be called
+from the pericfg and infracfg initialization functions which will
+register the reset controller using reset_controller_register. The
+reset controller will provide support for resetting the units
+connected to the pericfg and infracfg controller. The units resetted
+by this controller can use the standard reset device tree binding
+to gain access to the reset lines.
+
+Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
+Acked-by: Philipp Zabel <p.zabel@pengutronix.de>
+---
+ drivers/clk/mediatek/Makefile | 1 +
+ drivers/clk/mediatek/clk-mtk.h | 10 +++++
+ drivers/clk/mediatek/reset.c | 97 ++++++++++++++++++++++++++++++++++++++++
+ 3 files changed, 108 insertions(+)
+ create mode 100644 drivers/clk/mediatek/reset.c
+
+diff --git a/drivers/clk/mediatek/Makefile b/drivers/clk/mediatek/Makefile
+index c384e97..0b6f1c3 100644
+--- a/drivers/clk/mediatek/Makefile
++++ b/drivers/clk/mediatek/Makefile
+@@ -1 +1,2 @@
+ obj-y += clk-mtk.o clk-pll.o clk-gate.o
++obj-$(CONFIG_RESET_CONTROLLER) += reset.o
+diff --git a/drivers/clk/mediatek/clk-mtk.h b/drivers/clk/mediatek/clk-mtk.h
+index 694fc39..61035b9 100644
+--- a/drivers/clk/mediatek/clk-mtk.h
++++ b/drivers/clk/mediatek/clk-mtk.h
+@@ -156,4 +156,14 @@ void __init mtk_clk_register_plls(struct device_node *node,
+ const struct mtk_pll_data *plls, int num_plls,
+ struct clk_onecell_data *clk_data);
+
++#ifdef CONFIG_RESET_CONTROLLER
++void mtk_register_reset_controller(struct device_node *np,
++ unsigned int num_regs, int regofs);
++#else
++static inline void mtk_register_reset_controller(struct device_node *np,
++ unsigned int num_regs, int regofs)
++{
++}
++#endif
++
+ #endif /* __DRV_CLK_MTK_H */
+diff --git a/drivers/clk/mediatek/reset.c b/drivers/clk/mediatek/reset.c
+new file mode 100644
+index 0000000..9e9fe4b
+--- /dev/null
++++ b/drivers/clk/mediatek/reset.c
+@@ -0,0 +1,97 @@
++/*
++ * Copyright (c) 2014 MediaTek Inc.
++ *
++ * This program is free software; you can redistribute it and/or modify
++ * it under the terms of the GNU General Public License 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/mfd/syscon.h>
++#include <linux/module.h>
++#include <linux/of.h>
++#include <linux/platform_device.h>
++#include <linux/regmap.h>
++#include <linux/reset-controller.h>
++#include <linux/slab.h>
++
++#include "clk-mtk.h"
++
++struct mtk_reset {
++ struct regmap *regmap;
++ int regofs;
++ struct reset_controller_dev rcdev;
++};
++
++static int mtk_reset_assert(struct reset_controller_dev *rcdev,
++ unsigned long id)
++{
++ struct mtk_reset *data = container_of(rcdev, struct mtk_reset, rcdev);
++
++ return regmap_update_bits(data->regmap, data->regofs + ((id / 32) << 2),
++ BIT(id % 32), ~0);
++}
++
++static int mtk_reset_deassert(struct reset_controller_dev *rcdev,
++ unsigned long id)
++{
++ struct mtk_reset *data = container_of(rcdev, struct mtk_reset, rcdev);
++
++ return regmap_update_bits(data->regmap, data->regofs + ((id / 32) << 2),
++ BIT(id % 32), 0);
++}
++
++static int mtk_reset(struct reset_controller_dev *rcdev,
++ unsigned long id)
++{
++ int ret;
++
++ ret = mtk_reset_assert(rcdev, id);
++ if (ret)
++ return ret;
++
++ return mtk_reset_deassert(rcdev, id);
++}
++
++static struct reset_control_ops mtk_reset_ops = {
++ .assert = mtk_reset_assert,
++ .deassert = mtk_reset_deassert,
++ .reset = mtk_reset,
++};
++
++void mtk_register_reset_controller(struct device_node *np,
++ unsigned int num_regs, int regofs)
++{
++ struct mtk_reset *data;
++ int ret;
++ struct regmap *regmap;
++
++ regmap = syscon_node_to_regmap(np);
++ if (IS_ERR(regmap)) {
++ pr_err("Cannot find regmap for %s: %ld\n", np->full_name,
++ PTR_ERR(regmap));
++ return;
++ }
++
++ data = kzalloc(sizeof(*data), GFP_KERNEL);
++ if (!data)
++ return;
++
++ data->regmap = regmap;
++ data->regofs = regofs;
++ data->rcdev.owner = THIS_MODULE;
++ data->rcdev.nr_resets = num_regs * 32;
++ data->rcdev.ops = &mtk_reset_ops;
++ data->rcdev.of_node = np;
++
++ ret = reset_controller_register(&data->rcdev);
++ if (ret) {
++ pr_err("could not register reset controller: %d\n", ret);
++ kfree(data);
++ return;
++ }
++}
+--
+1.7.10.4
+