drivers/reset/reset-zynqmp.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2018 Xilinx, Inc.
   4  *
   5  */
   6
   7 #include <linux/err.h>
   8 #include <linux/of.h>
   9 #include <linux/platform_device.h>
  10 #include <linux/reset-controller.h>
  11 #include <linux/firmware/xlnx-zynqmp.h>
  12
  13 #define ZYNQMP_NR_RESETS (ZYNQMP_PM_RESET_END - ZYNQMP_PM_RESET_START)
  14 #define ZYNQMP_RESET_ID ZYNQMP_PM_RESET_START
  15 #define VERSAL_NR_RESETS        95
  16 #define VERSAL_NET_NR_RESETS    176
  17
  18 struct zynqmp_reset_soc_data {
  19         u32 reset_id;
  20         u32 num_resets;
  21 };
  22
  23 struct zynqmp_reset_data {
  24         struct reset_controller_dev rcdev;
  25         const struct zynqmp_reset_soc_data *data;
  26 };
  27
  28 static inline struct zynqmp_reset_data *
  29 to_zynqmp_reset_data(struct reset_controller_dev *rcdev)
  30 {
  31         return container_of(rcdev, struct zynqmp_reset_data, rcdev);
  32 }
  33
  34 static int zynqmp_reset_assert(struct reset_controller_dev *rcdev,
  35                                unsigned long id)
  36 {
  37         struct zynqmp_reset_data *priv = to_zynqmp_reset_data(rcdev);
  38
  39         return zynqmp_pm_reset_assert(priv->data->reset_id + id,
  40                                       PM_RESET_ACTION_ASSERT);
  41 }
  42
  43 static int zynqmp_reset_deassert(struct reset_controller_dev *rcdev,
  44                                  unsigned long id)
  45 {
  46         struct zynqmp_reset_data *priv = to_zynqmp_reset_data(rcdev);
  47
  48         return zynqmp_pm_reset_assert(priv->data->reset_id + id,
  49                                       PM_RESET_ACTION_RELEASE);
  50 }
  51
  52 static int zynqmp_reset_status(struct reset_controller_dev *rcdev,
  53                                unsigned long id)
  54 {
  55         struct zynqmp_reset_data *priv = to_zynqmp_reset_data(rcdev);
  56         int err;
  57         u32 val;
  58
  59         err = zynqmp_pm_reset_get_status(priv->data->reset_id + id, &val);
  60         if (err)
  61                 return err;
  62
  63         return val;
  64 }
  65
  66 static int zynqmp_reset_reset(struct reset_controller_dev *rcdev,
  67                               unsigned long id)
  68 {
  69         struct zynqmp_reset_data *priv = to_zynqmp_reset_data(rcdev);
  70
  71         return zynqmp_pm_reset_assert(priv->data->reset_id + id,
  72                                       PM_RESET_ACTION_PULSE);
  73 }
  74
  75 static int zynqmp_reset_of_xlate(struct reset_controller_dev *rcdev,
  76                                  const struct of_phandle_args *reset_spec)
  77 {
  78         return reset_spec->args[0];
  79 }
  80
  81 static const struct zynqmp_reset_soc_data zynqmp_reset_data = {
  82         .reset_id = ZYNQMP_RESET_ID,
  83         .num_resets = ZYNQMP_NR_RESETS,
  84 };
  85
  86 static const struct zynqmp_reset_soc_data versal_reset_data = {
  87         .reset_id = 0,
  88         .num_resets = VERSAL_NR_RESETS,
  89 };
  90
  91 static const struct zynqmp_reset_soc_data versal_net_reset_data = {
  92         .reset_id = 0,
  93         .num_resets = VERSAL_NET_NR_RESETS,
  94 };
  95
  96 static const struct reset_control_ops zynqmp_reset_ops = {
  97         .reset = zynqmp_reset_reset,
  98         .assert = zynqmp_reset_assert,
  99         .deassert = zynqmp_reset_deassert,
 100         .status = zynqmp_reset_status,
 101 };
 102
 103 static int zynqmp_reset_probe(struct platform_device *pdev)
 104 {
 105         struct zynqmp_reset_data *priv;
 106
 107         priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
 108         if (!priv)
 109                 return -ENOMEM;
 110
 111         priv->data = of_device_get_match_data(&pdev->dev);
 112         if (!priv->data)
 113                 return -EINVAL;
 114
 115         priv->rcdev.ops = &zynqmp_reset_ops;
 116         priv->rcdev.owner = THIS_MODULE;
 117         priv->rcdev.of_node = pdev->dev.of_node;
 118         priv->rcdev.nr_resets = priv->data->num_resets;
 119         priv->rcdev.of_reset_n_cells = 1;
 120         priv->rcdev.of_xlate = zynqmp_reset_of_xlate;
 121
 122         return devm_reset_controller_register(&pdev->dev, &priv->rcdev);
 123 }
 124
 125 static const struct of_device_id zynqmp_reset_dt_ids[] = {
 126         { .compatible = "xlnx,zynqmp-reset", .data = &zynqmp_reset_data, },
 127         { .compatible = "xlnx,versal-reset", .data = &versal_reset_data, },
 128         { .compatible = "xlnx,versal-net-reset", .data = &versal_net_reset_data, },
 129         { /* sentinel */ },
 130 };
 131
 132 static struct platform_driver zynqmp_reset_driver = {
 133         .probe  = zynqmp_reset_probe,
 134         .driver = {
 135                 .name           = KBUILD_MODNAME,
 136                 .of_match_table = zynqmp_reset_dt_ids,
 137         },
 138 };
 139
 140 static int __init zynqmp_reset_init(void)
 141 {
 142         return platform_driver_register(&zynqmp_reset_driver);
 143 }
 144
 145 arch_initcall(zynqmp_reset_init);