drivers/clk/clk-uclass.c

   1 /*
   2  * Copyright (C) 2015 Google, Inc
   3  * Written by Simon Glass <sjg@chromium.org>
   4  * Copyright (c) 2016, NVIDIA CORPORATION.
   5  *
   6  * SPDX-License-Identifier:     GPL-2.0+
   7  */
   8
   9 #include <common.h>
  10 #include <clk.h>
  11 #include <clk-uclass.h>
  12 #include <dm.h>
  13 #include <dt-structs.h>
  14 #include <errno.h>
  15
  16 DECLARE_GLOBAL_DATA_PTR;
  17
  18 static inline struct clk_ops *clk_dev_ops(struct udevice *dev)
  19 {
  20         return (struct clk_ops *)dev->driver->ops;
  21 }
  22
  23 #if CONFIG_IS_ENABLED(OF_CONTROL)
  24 # if CONFIG_IS_ENABLED(OF_PLATDATA)
  25 int clk_get_by_index_platdata(struct udevice *dev, int index,
  26                               struct phandle_2_cell *cells, struct clk *clk)
  27 {
  28         int ret;
  29
  30         if (index != 0)
  31                 return -ENOSYS;
  32         ret = uclass_get_device(UCLASS_CLK, 0, &clk->dev);
  33         if (ret)
  34                 return ret;
  35         clk->id = cells[0].id;
  36
  37         return 0;
  38 }
  39 # else
  40 static int clk_of_xlate_default(struct clk *clk,
  41                                 struct fdtdec_phandle_args *args)
  42 {
  43         debug("%s(clk=%p)\n", __func__, clk);
  44
  45         if (args->args_count > 1) {
  46                 debug("Invaild args_count: %d\n", args->args_count);
  47                 return -EINVAL;
  48         }
  49
  50         if (args->args_count)
  51                 clk->id = args->args[0];
  52         else
  53                 clk->id = 0;
  54
  55         return 0;
  56 }
  57
  58 int clk_get_by_index(struct udevice *dev, int index, struct clk *clk)
  59 {
  60         int ret;
  61         struct fdtdec_phandle_args args;
  62         struct udevice *dev_clk;
  63         struct clk_ops *ops;
  64
  65         debug("%s(dev=%p, index=%d, clk=%p)\n", __func__, dev, index, clk);
  66
  67         assert(clk);
  68         ret = fdtdec_parse_phandle_with_args(gd->fdt_blob, dev->of_offset,
  69                                              "clocks", "#clock-cells", 0, index,
  70                                              &args);
  71         if (ret) {
  72                 debug("%s: fdtdec_parse_phandle_with_args failed: err=%d\n",
  73                       __func__, ret);
  74                 return ret;
  75         }
  76
  77         ret = uclass_get_device_by_of_offset(UCLASS_CLK, args.node, &dev_clk);
  78         if (ret) {
  79                 debug("%s: uclass_get_device_by_of_offset failed: err=%d\n",
  80                       __func__, ret);
  81                 return ret;
  82         }
  83         ops = clk_dev_ops(dev_clk);
  84
  85         if (ops->of_xlate)
  86                 ret = ops->of_xlate(clk, &args);
  87         else
  88                 ret = clk_of_xlate_default(clk, &args);
  89         if (ret) {
  90                 debug("of_xlate() failed: %d\n", ret);
  91                 return ret;
  92         }
  93
  94         return clk_request(dev_clk, clk);
  95 }
  96 # endif /* OF_PLATDATA */
  97
  98 int clk_get_by_name(struct udevice *dev, const char *name, struct clk *clk)
  99 {
 100         int index;
 101
 102         debug("%s(dev=%p, name=%s, clk=%p)\n", __func__, dev, name, clk);
 103
 104         index = fdt_find_string(gd->fdt_blob, dev->of_offset, "clock-names",
 105                                 name);
 106         if (index < 0) {
 107                 debug("fdt_find_string() failed: %d\n", index);
 108                 return index;
 109         }
 110
 111         return clk_get_by_index(dev, index, clk);
 112 }
 113 #endif /* OF_CONTROL */
 114
 115 int clk_request(struct udevice *dev, struct clk *clk)
 116 {
 117         struct clk_ops *ops = clk_dev_ops(dev);
 118
 119         debug("%s(dev=%p, clk=%p)\n", __func__, dev, clk);
 120
 121         clk->dev = dev;
 122
 123         if (!ops->request)
 124                 return 0;
 125
 126         return ops->request(clk);
 127 }
 128
 129 int clk_free(struct clk *clk)
 130 {
 131         struct clk_ops *ops = clk_dev_ops(clk->dev);
 132
 133         debug("%s(clk=%p)\n", __func__, clk);
 134
 135         if (!ops->free)
 136                 return 0;
 137
 138         return ops->free(clk);
 139 }
 140
 141 ulong clk_get_rate(struct clk *clk)
 142 {
 143         struct clk_ops *ops = clk_dev_ops(clk->dev);
 144
 145         debug("%s(clk=%p)\n", __func__, clk);
 146
 147         if (!ops->get_rate)
 148                 return -ENOSYS;
 149
 150         return ops->get_rate(clk);
 151 }
 152
 153 ulong clk_set_rate(struct clk *clk, ulong rate)
 154 {
 155         struct clk_ops *ops = clk_dev_ops(clk->dev);
 156
 157         debug("%s(clk=%p, rate=%lu)\n", __func__, clk, rate);
 158
 159         if (!ops->set_rate)
 160                 return -ENOSYS;
 161
 162         return ops->set_rate(clk, rate);
 163 }
 164
 165 int clk_enable(struct clk *clk)
 166 {
 167         struct clk_ops *ops = clk_dev_ops(clk->dev);
 168
 169         debug("%s(clk=%p)\n", __func__, clk);
 170
 171         if (!ops->enable)
 172                 return -ENOSYS;
 173
 174         return ops->enable(clk);
 175 }
 176
 177 int clk_disable(struct clk *clk)
 178 {
 179         struct clk_ops *ops = clk_dev_ops(clk->dev);
 180
 181         debug("%s(clk=%p)\n", __func__, clk);
 182
 183         if (!ops->disable)
 184                 return -ENOSYS;
 185
 186         return ops->disable(clk);
 187 }
 188
 189 UCLASS_DRIVER(clk) = {
 190         .id             = UCLASS_CLK,
 191         .name           = "clk",
 192 };