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 "reset-starfive-jh71x0.h"
  11
  12 #include <dt-bindings/reset/starfive,jh7110-crg.h>
  13
  14 struct jh7110_reset_info {
  15         unsigned int nr_resets;
  16         unsigned int assert_offset;
  17         unsigned int status_offset;
  18 };
  19
  20 static const struct jh7110_reset_info jh7110_sys_info = {
  21         .nr_resets = JH7110_SYSRST_END,
  22         .assert_offset = 0x2F8,
  23         .status_offset = 0x308,
  24 };
  25
  26 static const struct jh7110_reset_info jh7110_aon_info = {
  27         .nr_resets = JH7110_AONRST_END,
  28         .assert_offset = 0x38,
  29         .status_offset = 0x3C,
  30 };
  31
  32 static const struct jh7110_reset_info jh7110_stg_info = {
  33         .nr_resets = JH7110_STGRST_END,
  34         .assert_offset = 0x74,
  35         .status_offset = 0x78,
  36 };
  37
  38 static const struct jh7110_reset_info jh7110_isp_info = {
  39         .nr_resets = JH7110_ISPRST_END,
  40         .assert_offset = 0x38,
  41         .status_offset = 0x3C,
  42 };
  43
  44 static int jh7110_reset_probe(struct auxiliary_device *adev,
  45                               const struct auxiliary_device_id *id)
  46 {
  47         struct jh7110_reset_info *info = (struct jh7110_reset_info *)(id->driver_data);
  48         void __iomem **base = (void __iomem **)dev_get_drvdata(adev->dev.parent);
  49
  50         if (!info || !base)
  51                 return -ENODEV;
  52
  53         return reset_starfive_jh71x0_register(&adev->dev, adev->dev.parent->of_node,
  54                                               *base + info->assert_offset,
  55                                               *base + info->status_offset,
  56                                               NULL,
  57                                               info->nr_resets,
  58                                               NULL);
  59 }
  60
  61 static const struct auxiliary_device_id jh7110_reset_ids[] = {
  62         {
  63                 .name = "clk_starfive_jh71x0.reset-sys",
  64                 .driver_data = (kernel_ulong_t)&jh7110_sys_info,
  65         },
  66         {
  67                 .name = "clk_starfive_jh71x0.reset-aon",
  68                 .driver_data = (kernel_ulong_t)&jh7110_aon_info,
  69         },
  70         {
  71                 .name = "clk_starfive_jh71x0.reset-stg",
  72                 .driver_data = (kernel_ulong_t)&jh7110_stg_info,
  73         },
  74         {
  75                 .name = "clk_starfive_jh71x0.reset-isp",
  76                 .driver_data = (kernel_ulong_t)&jh7110_isp_info,
  77         },
  78         { /* sentinel */ }
  79 };
  80 MODULE_DEVICE_TABLE(auxiliary, jh7110_reset_ids);
  81
  82 static struct auxiliary_driver jh7110_reset_driver = {
  83         .probe          = jh7110_reset_probe,
  84         .id_table       = jh7110_reset_ids,
  85 };
  86 module_auxiliary_driver(jh7110_reset_driver);
  87
  88 MODULE_AUTHOR("Hal Feng <hal.feng@starfivetech.com>");
  89 MODULE_DESCRIPTION("StarFive JH7110 reset driver");
  90 MODULE_LICENSE("GPL");