drivers/clk/clk_sandbox.c

   1 /*
   2  * (C) Copyright 2015 Google, Inc
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0
   5  */
   6
   7 #include <common.h>
   8 #include <clk.h>
   9 #include <dm.h>
  10 #include <errno.h>
  11 #include <asm/test.h>
  12
  13 struct sandbox_clk_priv {
  14         ulong rate;
  15         ulong periph_rate[PERIPH_ID_COUNT];
  16 };
  17
  18 static ulong sandbox_clk_get_rate(struct udevice *dev)
  19 {
  20         struct sandbox_clk_priv *priv = dev_get_priv(dev);
  21
  22         return priv->rate;
  23 }
  24
  25 static ulong sandbox_clk_set_rate(struct udevice *dev, ulong rate)
  26 {
  27         struct sandbox_clk_priv *priv = dev_get_priv(dev);
  28
  29         if (!rate)
  30                 return -EINVAL;
  31         priv->rate = rate;
  32         return 0;
  33 }
  34
  35 static ulong sandbox_get_periph_rate(struct udevice *dev, int periph)
  36 {
  37         struct sandbox_clk_priv *priv = dev_get_priv(dev);
  38
  39         if (periph < PERIPH_ID_FIRST || periph >= PERIPH_ID_COUNT)
  40                 return -EINVAL;
  41         return priv->periph_rate[periph];
  42 }
  43
  44 static ulong sandbox_set_periph_rate(struct udevice *dev, int periph,
  45                                      ulong rate)
  46 {
  47         struct sandbox_clk_priv *priv = dev_get_priv(dev);
  48         ulong old_rate;
  49
  50         if (periph < PERIPH_ID_FIRST || periph >= PERIPH_ID_COUNT)
  51                 return -EINVAL;
  52         old_rate = priv->periph_rate[periph];
  53         priv->periph_rate[periph] = rate;
  54
  55         return old_rate;
  56 }
  57
  58 static int sandbox_clk_probe(struct udevice *dev)
  59 {
  60         struct sandbox_clk_priv *priv = dev_get_priv(dev);
  61
  62         priv->rate = SANDBOX_CLK_RATE;
  63
  64         return 0;
  65 }
  66
  67 static struct clk_ops sandbox_clk_ops = {
  68         .get_rate       = sandbox_clk_get_rate,
  69         .set_rate       = sandbox_clk_set_rate,
  70         .get_periph_rate = sandbox_get_periph_rate,
  71         .set_periph_rate = sandbox_set_periph_rate,
  72 };
  73
  74 static const struct udevice_id sandbox_clk_ids[] = {
  75         { .compatible = "sandbox,clk" },
  76         { }
  77 };
  78
  79 U_BOOT_DRIVER(clk_sandbox) = {
  80         .name           = "clk_sandbox",
  81         .id             = UCLASS_CLK,
  82         .of_match       = sandbox_clk_ids,
  83         .ops            = &sandbox_clk_ops,
  84         .priv_auto_alloc_size = sizeof(struct sandbox_clk_priv),
  85         .probe          = sandbox_clk_probe,
  86 };