OpenCloudOS-Kernel/drivers/clk/mediatek/reset.c

98 lines
2.3 KiB
C
Raw Normal View History

/*
* 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 const 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)) {
clk: Convert to using %pOF instead of full_name Now that we have a custom printf format specifier, convert users of full_name to use %pOF instead. This is preparation to remove storing of the full path string for each node. Signed-off-by: Rob Herring <robh@kernel.org> Cc: Michael Turquette <mturquette@baylibre.com> Cc: Stephen Boyd <sboyd@codeaurora.org> Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com> Cc: Alexandre Torgue <alexandre.torgue@st.com> Cc: Russell King <linux@armlinux.org.uk> Cc: Matthias Brugger <matthias.bgg@gmail.com> Cc: Geert Uytterhoeven <geert+renesas@glider.be> Cc: Maxime Ripard <maxime.ripard@free-electrons.com> Cc: Chen-Yu Tsai <wens@csie.org> Cc: "Emilio López" <emilio@elopez.com.ar> Cc: Peter De Schrijver <pdeschrijver@nvidia.com> Cc: Prashant Gaikwad <pgaikwad@nvidia.com> Cc: Thierry Reding <thierry.reding@gmail.com> Cc: Jonathan Hunter <jonathanh@nvidia.com> Cc: Tero Kristo <t-kristo@ti.com> Cc: linux-clk@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-mediatek@lists.infradead.org Cc: linux-renesas-soc@vger.kernel.org Cc: linux-tegra@vger.kernel.org Cc: linux-omap@vger.kernel.org Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be> Acked-by: Geert Uytterhoeven <geert+renesas@glider.be> Acked-by: James Liao <jamesjj.liao@mediatek.com> Acked-by: Alexandre TORGUE <alexandre.torgue@st.com> Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com> Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
2017-07-19 05:42:52 +08:00
pr_err("Cannot find regmap for %pOF: %ld\n", np,
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;
}
}