LXR linux/drivers/clk/qcom/reset.c

   1/*
   2 * Copyright (c) 2013, The Linux Foundation. All rights reserved.
   3 *
   4 * This software is licensed under the terms of the GNU General Public
   5 * License version 2, as published by the Free Software Foundation, and
   6 * may be copied, distributed, and modified under those terms.
   7 *
   8 * This program is distributed in the hope that it will be useful,
   9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11 * GNU General Public License for more details.
  12 */
  13
  14#include <linux/bitops.h>
  15#include <linux/export.h>
  16#include <linux/regmap.h>
  17#include <linux/reset-controller.h>
  18#include <linux/delay.h>
  19
  20#include "reset.h"
  21
  22static int qcom_reset(struct reset_controller_dev *rcdev, unsigned long id)
  23{
  24        rcdev->ops->assert(rcdev, id);
  25        udelay(1);
  26        rcdev->ops->deassert(rcdev, id);
  27        return 0;
  28}
  29
  30static int
  31qcom_reset_assert(struct reset_controller_dev *rcdev, unsigned long id)
  32{
  33        struct qcom_reset_controller *rst;
  34        const struct qcom_reset_map *map;
  35        u32 mask;
  36
  37        rst = to_qcom_reset_controller(rcdev);
  38        map = &rst->reset_map[id];
  39        mask = BIT(map->bit);
  40
  41        return regmap_update_bits(rst->regmap, map->reg, mask, mask);
  42}
  43
  44static int
  45qcom_reset_deassert(struct reset_controller_dev *rcdev, unsigned long id)
  46{
  47        struct qcom_reset_controller *rst;
  48        const struct qcom_reset_map *map;
  49        u32 mask;
  50
  51        rst = to_qcom_reset_controller(rcdev);
  52        map = &rst->reset_map[id];
  53        mask = BIT(map->bit);
  54
  55        return regmap_update_bits(rst->regmap, map->reg, mask, 0);
  56}
  57
  58struct reset_control_ops qcom_reset_ops = {
  59        .reset = qcom_reset,
  60        .assert = qcom_reset_assert,
  61        .deassert = qcom_reset_deassert,
  62};
  63EXPORT_SYMBOL_GPL(qcom_reset_ops);
  64