mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-15 16:24:13 +08:00
b36ba30c8a
Reset controllers and clock controllers are combined into one IP block on Qualcomm chipsets. Usually a reset signal is associated with each clock branch but sometimes a reset signal is associated with a handful of clocks. Either way the register interface is the same; set a bit to assert a reset and clear a bit to deassert a reset. Add support for these types of resets signals. Signed-off-by: Stephen Boyd <sboyd@codeaurora.org> Signed-off-by: Mike Turquette <mturquette@linaro.org>
64 lines
1.6 KiB
C
64 lines
1.6 KiB
C
/*
|
|
* Copyright (c) 2013, The Linux Foundation. All rights reserved.
|
|
*
|
|
* This software is licensed under the terms of the GNU General Public
|
|
* License version 2, as published by the Free Software Foundation, and
|
|
* may be copied, distributed, and modified under those terms.
|
|
*
|
|
* 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/bitops.h>
|
|
#include <linux/export.h>
|
|
#include <linux/regmap.h>
|
|
#include <linux/reset-controller.h>
|
|
#include <linux/delay.h>
|
|
|
|
#include "reset.h"
|
|
|
|
static int qcom_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
|
|
qcom_reset_assert(struct reset_controller_dev *rcdev, unsigned long id)
|
|
{
|
|
struct qcom_reset_controller *rst;
|
|
const struct qcom_reset_map *map;
|
|
u32 mask;
|
|
|
|
rst = to_qcom_reset_controller(rcdev);
|
|
map = &rst->reset_map[id];
|
|
mask = BIT(map->bit);
|
|
|
|
return regmap_update_bits(rst->regmap, map->reg, mask, mask);
|
|
}
|
|
|
|
static int
|
|
qcom_reset_deassert(struct reset_controller_dev *rcdev, unsigned long id)
|
|
{
|
|
struct qcom_reset_controller *rst;
|
|
const struct qcom_reset_map *map;
|
|
u32 mask;
|
|
|
|
rst = to_qcom_reset_controller(rcdev);
|
|
map = &rst->reset_map[id];
|
|
mask = BIT(map->bit);
|
|
|
|
return regmap_update_bits(rst->regmap, map->reg, mask, 0);
|
|
}
|
|
|
|
struct reset_control_ops qcom_reset_ops = {
|
|
.reset = qcom_reset,
|
|
.assert = qcom_reset_assert,
|
|
.deassert = qcom_reset_deassert,
|
|
};
|
|
EXPORT_SYMBOL_GPL(qcom_reset_ops);
|