Eric Lee / smarc-uboot

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drivers/clk/clk_sandbox.c 2.05 KB
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d41ce506b   Eric Lee   Initial Release, ... 
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  /*
   * (C) Copyright 2015 Google, Inc
   *
   * SPDX-License-Identifier:	GPL-2.0
   */
  
  #include <common.h>
  #include <clk-uclass.h>
  #include <dm.h>
  #include <errno.h>
  #include <asm/clk.h>
  
  struct sandbox_clk_priv {
  	ulong rate[SANDBOX_CLK_ID_COUNT];
  	bool enabled[SANDBOX_CLK_ID_COUNT];
  };
  
  static ulong sandbox_clk_get_rate(struct clk *clk)
  {
  	struct sandbox_clk_priv *priv = dev_get_priv(clk->dev);
  
  	if (clk->id >= SANDBOX_CLK_ID_COUNT)
  		return -EINVAL;
  
  	return priv->rate[clk->id];
  }
  
  static ulong sandbox_clk_set_rate(struct clk *clk, ulong rate)
  {
  	struct sandbox_clk_priv *priv = dev_get_priv(clk->dev);
  	ulong old_rate;
  
  	if (clk->id >= SANDBOX_CLK_ID_COUNT)
  		return -EINVAL;
  
  	if (!rate)
  		return -EINVAL;
  
  	old_rate = priv->rate[clk->id];
  	priv->rate[clk->id] = rate;
  
  	return old_rate;
  }
  
  static int sandbox_clk_enable(struct clk *clk)
  {
  	struct sandbox_clk_priv *priv = dev_get_priv(clk->dev);
  
  	if (clk->id >= SANDBOX_CLK_ID_COUNT)
  		return -EINVAL;
  
  	priv->enabled[clk->id] = true;
  
  	return 0;
  }
  
  static int sandbox_clk_disable(struct clk *clk)
  {
  	struct sandbox_clk_priv *priv = dev_get_priv(clk->dev);
  
  	if (clk->id >= SANDBOX_CLK_ID_COUNT)
  		return -EINVAL;
  
  	priv->enabled[clk->id] = false;
  
  	return 0;
  }
  
  static struct clk_ops sandbox_clk_ops = {
  	.get_rate	= sandbox_clk_get_rate,
  	.set_rate	= sandbox_clk_set_rate,
  	.enable		= sandbox_clk_enable,
  	.disable	= sandbox_clk_disable,
  };
  
  static const struct udevice_id sandbox_clk_ids[] = {
  	{ .compatible = "sandbox,clk" },
  	{ }
  };
  
  U_BOOT_DRIVER(clk_sandbox) = {
  	.name		= "clk_sandbox",
  	.id		= UCLASS_CLK,
  	.of_match	= sandbox_clk_ids,
  	.ops		= &sandbox_clk_ops,
  	.priv_auto_alloc_size = sizeof(struct sandbox_clk_priv),
  };
  
  ulong sandbox_clk_query_rate(struct udevice *dev, int id)
  {
  	struct sandbox_clk_priv *priv = dev_get_priv(dev);
  
  	if (id < 0 || id >= SANDBOX_CLK_ID_COUNT)
  		return -EINVAL;
  
  	return priv->rate[id];
  }
  
  int sandbox_clk_query_enable(struct udevice *dev, int id)
  {
  	struct sandbox_clk_priv *priv = dev_get_priv(dev);
  
  	if (id < 0 || id >= SANDBOX_CLK_ID_COUNT)
  		return -EINVAL;
  
  	return priv->enabled[id];
  }