drivers/reset/starfive/reset-starfive-jh7110.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Reset driver for the StarFive JH7110 SoC
   4  *
   5  * Copyright (C) 2022 StarFive Technology Co., Ltd.
   6  */
   7
   8 #include <linux/auxiliary_bus.h>
   9
  10 #include <soc/starfive/reset-starfive-jh71x0.h>
  11
  12 #include "reset-starfive-jh71x0.h"
  13
  14 #include <dt-bindings/reset/starfive,jh7110-crg.h>
  15
  16 struct jh7110_reset_info {
  17         unsigned int nr_resets;
  18         unsigned int assert_offset;
  19         unsigned int status_offset;
  20 };
  21
  22 static const struct jh7110_reset_info jh7110_sys_info = {
  23         .nr_resets = JH7110_SYSRST_END,
  24         .assert_offset = 0x2F8,
  25         .status_offset = 0x308,
  26 };
  27
  28 static const struct jh7110_reset_info jh7110_aon_info = {
  29         .nr_resets = JH7110_AONRST_END,
  30         .assert_offset = 0x38,
  31         .status_offset = 0x3C,
  32 };
  33
  34 static int jh7110_reset_probe(struct auxiliary_device *adev,
  35                               const struct auxiliary_device_id *id)
  36 {
  37         struct jh7110_reset_info *info = (struct jh7110_reset_info *)(id->driver_data);
  38         struct jh71x0_reset_adev *rdev = to_jh71x0_reset_adev(adev);
  39         void __iomem *base = rdev->base;
  40
  41         if (!info || !base)
  42                 return -ENODEV;
  43
  44         return reset_starfive_jh71x0_register(&adev->dev, adev->dev.parent->of_node,
  45                                               base + info->assert_offset,
  46                                               base + info->status_offset,
  47                                               NULL,
  48                                               info->nr_resets,
  49                                               NULL);
  50 }
  51
  52 static const struct auxiliary_device_id jh7110_reset_ids[] = {
  53         {
  54                 .name = "clk_starfive_jh7110_sys.rst-sys",
  55                 .driver_data = (kernel_ulong_t)&jh7110_sys_info,
  56         },
  57         {
  58                 .name = "clk_starfive_jh7110_sys.rst-aon",
  59                 .driver_data = (kernel_ulong_t)&jh7110_aon_info,
  60         },
  61         { /* sentinel */ }
  62 };
  63 MODULE_DEVICE_TABLE(auxiliary, jh7110_reset_ids);
  64
  65 static struct auxiliary_driver jh7110_reset_driver = {
  66         .probe          = jh7110_reset_probe,
  67         .id_table       = jh7110_reset_ids,
  68 };
  69 module_auxiliary_driver(jh7110_reset_driver);
  70
  71 MODULE_AUTHOR("Hal Feng <hal.feng@starfivetech.com>");
  72 MODULE_DESCRIPTION("StarFive JH7110 reset driver");
  73 MODULE_LICENSE("GPL");