drivers/clk/clk_bcm6345.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
   4  *
   5  * Derived from linux/arch/mips/bcm63xx/clk.c:
   6  *      Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
   7  */
   8
   9 #include <common.h>
  10 #include <clk-uclass.h>
  11 #include <dm.h>
  12 #include <errno.h>
  13 #include <asm/io.h>
  14 #include <linux/bitops.h>
  15
  16 #define MAX_CLKS        32
  17
  18 struct bcm6345_clk_priv {
  19         void __iomem *regs;
  20 };
  21
  22 static int bcm6345_clk_enable(struct clk *clk)
  23 {
  24         struct bcm6345_clk_priv *priv = dev_get_priv(clk->dev);
  25
  26         if (clk->id >= MAX_CLKS)
  27                 return -EINVAL;
  28
  29         setbits_be32(priv->regs, BIT(clk->id));
  30
  31         return 0;
  32 }
  33
  34 static int bcm6345_clk_disable(struct clk *clk)
  35 {
  36         struct bcm6345_clk_priv *priv = dev_get_priv(clk->dev);
  37
  38         if (clk->id >= MAX_CLKS)
  39                 return -EINVAL;
  40
  41         clrbits_be32(priv->regs, BIT(clk->id));
  42
  43         return 0;
  44 }
  45
  46 static struct clk_ops bcm6345_clk_ops = {
  47         .disable = bcm6345_clk_disable,
  48         .enable = bcm6345_clk_enable,
  49 };
  50
  51 static const struct udevice_id bcm6345_clk_ids[] = {
  52         { .compatible = "brcm,bcm6345-clk" },
  53         { /* sentinel */ }
  54 };
  55
  56 static int bcm63xx_clk_probe(struct udevice *dev)
  57 {
  58         struct bcm6345_clk_priv *priv = dev_get_priv(dev);
  59
  60         priv->regs = dev_remap_addr(dev);
  61         if (!priv->regs)
  62                 return -EINVAL;
  63
  64         return 0;
  65 }
  66
  67 U_BOOT_DRIVER(clk_bcm6345) = {
  68         .name = "clk_bcm6345",
  69         .id = UCLASS_CLK,
  70         .of_match = bcm6345_clk_ids,
  71         .ops = &bcm6345_clk_ops,
  72         .probe = bcm63xx_clk_probe,
  73         .priv_auto_alloc_size = sizeof(struct bcm6345_clk_priv),
  74 };