drivers/clk/qcom/reset.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2013, The Linux Foundation. All rights reserved.
   4  */
   5
   6 #include <linux/bitops.h>
   7 #include <linux/export.h>
   8 #include <linux/regmap.h>
   9 #include <linux/reset-controller.h>
  10 #include <linux/delay.h>
  11
  12 #include "reset.h"
  13
  14 static int qcom_reset(struct reset_controller_dev *rcdev, unsigned long id)
  15 {
  16         rcdev->ops->assert(rcdev, id);
  17         udelay(1);
  18         rcdev->ops->deassert(rcdev, id);
  19         return 0;
  20 }
  21
  22 static int
  23 qcom_reset_assert(struct reset_controller_dev *rcdev, unsigned long id)
  24 {
  25         struct qcom_reset_controller *rst;
  26         const struct qcom_reset_map *map;
  27         u32 mask;
  28
  29         rst = to_qcom_reset_controller(rcdev);
  30         map = &rst->reset_map[id];
  31         mask = BIT(map->bit);
  32
  33         return regmap_update_bits(rst->regmap, map->reg, mask, mask);
  34 }
  35
  36 static int
  37 qcom_reset_deassert(struct reset_controller_dev *rcdev, unsigned long id)
  38 {
  39         struct qcom_reset_controller *rst;
  40         const struct qcom_reset_map *map;
  41         u32 mask;
  42
  43         rst = to_qcom_reset_controller(rcdev);
  44         map = &rst->reset_map[id];
  45         mask = BIT(map->bit);
  46
  47         return regmap_update_bits(rst->regmap, map->reg, mask, 0);
  48 }
  49
  50 const struct reset_control_ops qcom_reset_ops = {
  51         .reset = qcom_reset,
  52         .assert = qcom_reset_assert,
  53         .deassert = qcom_reset_deassert,
  54 };
  55 EXPORT_SYMBOL_GPL(qcom_reset_ops);