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
  22 static 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
  30 static int
  31 qcom_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
  44 static int
  45 qcom_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
  58 struct reset_control_ops qcom_reset_ops = {
  59         .reset = qcom_reset,
  60         .assert = qcom_reset_assert,
  61         .deassert = qcom_reset_deassert,
  62 };
  63 EXPORT_SYMBOL_GPL(qcom_reset_ops);