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 ofnode_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 ofnode_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 = dev_read_phandle_with_args(dev, "clocks", "#clock-cells", 0,
  69                                           index, &args);
  70         if (ret) {
  71                 debug("%s: fdtdec_parse_phandle_with_args failed: err=%d\n",
  72                       __func__, ret);
  73                 return ret;
  74         }
  75
  76         ret = uclass_get_device_by_ofnode(UCLASS_CLK, args.node, &dev_clk);
  77         if (ret) {
  78                 debug("%s: uclass_get_device_by_of_offset failed: err=%d\n",
  79                       __func__, ret);
  80                 return ret;
  81         }
  82
  83         clk->dev = dev_clk;
  84
  85         ops = clk_dev_ops(dev_clk);
  86
  87         if (ops->of_xlate)
  88                 ret = ops->of_xlate(clk, &args);
  89         else
  90                 ret = clk_of_xlate_default(clk, &args);
  91         if (ret) {
  92                 debug("of_xlate() failed: %d\n", ret);
  93                 return ret;
  94         }
  95
  96         return clk_request(dev_clk, clk);
  97 }
  98 # endif /* OF_PLATDATA */
  99
 100 int clk_get_by_name(struct udevice *dev, const char *name, struct clk *clk)
 101 {
 102         int index;
 103
 104         debug("%s(dev=%p, name=%s, clk=%p)\n", __func__, dev, name, clk);
 105
 106         index = dev_read_stringlist_search(dev, "clock-names", name);
 107         if (index < 0) {
 108                 debug("fdt_stringlist_search() failed: %d\n", index);
 109                 return index;
 110         }
 111
 112         return clk_get_by_index(dev, index, clk);
 113 }
 114 #endif /* OF_CONTROL */
 115
 116 int clk_request(struct udevice *dev, struct clk *clk)
 117 {
 118         struct clk_ops *ops = clk_dev_ops(dev);
 119
 120         debug("%s(dev=%p, clk=%p)\n", __func__, dev, clk);
 121
 122         clk->dev = dev;
 123
 124         if (!ops->request)
 125                 return 0;
 126
 127         return ops->request(clk);
 128 }
 129
 130 int clk_free(struct clk *clk)
 131 {
 132         struct clk_ops *ops = clk_dev_ops(clk->dev);
 133
 134         debug("%s(clk=%p)\n", __func__, clk);
 135
 136         if (!ops->free)
 137                 return 0;
 138
 139         return ops->free(clk);
 140 }
 141
 142 ulong clk_get_rate(struct clk *clk)
 143 {
 144         struct clk_ops *ops = clk_dev_ops(clk->dev);
 145
 146         debug("%s(clk=%p)\n", __func__, clk);
 147
 148         if (!ops->get_rate)
 149                 return -ENOSYS;
 150
 151         return ops->get_rate(clk);
 152 }
 153
 154 ulong clk_set_rate(struct clk *clk, ulong rate)
 155 {
 156         struct clk_ops *ops = clk_dev_ops(clk->dev);
 157
 158         debug("%s(clk=%p, rate=%lu)\n", __func__, clk, rate);
 159
 160         if (!ops->set_rate)
 161                 return -ENOSYS;
 162
 163         return ops->set_rate(clk, rate);
 164 }
 165
 166 int clk_enable(struct clk *clk)
 167 {
 168         struct clk_ops *ops = clk_dev_ops(clk->dev);
 169
 170         debug("%s(clk=%p)\n", __func__, clk);
 171
 172         if (!ops->enable)
 173                 return -ENOSYS;
 174
 175         return ops->enable(clk);
 176 }
 177
 178 int clk_disable(struct clk *clk)
 179 {
 180         struct clk_ops *ops = clk_dev_ops(clk->dev);
 181
 182         debug("%s(clk=%p)\n", __func__, clk);
 183
 184         if (!ops->disable)
 185                 return -ENOSYS;
 186
 187         return ops->disable(clk);
 188 }
 189
 190 UCLASS_DRIVER(clk) = {
 191         .id             = UCLASS_CLK,
 192         .name           = "clk",
 193 };