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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> Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
98 lines
2.3 KiB
C
98 lines
2.3 KiB
C
/*
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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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#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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#include "clk-mtk.h"
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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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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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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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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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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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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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ret = mtk_reset_assert(rcdev, id);
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if (ret)
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return ret;
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return mtk_reset_deassert(rcdev, id);
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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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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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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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data = kzalloc(sizeof(*data), GFP_KERNEL);
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if (!data)
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return;
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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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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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