git.sur5r.net Git - u-boot/blob - 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
  15 #define MAX_CLKS        32
  16
  17 struct bcm6345_clk_priv {
  18         void __iomem *regs;
  19 };
  20
  21 static int bcm6345_clk_enable(struct clk *clk)
  22 {
  23         struct bcm6345_clk_priv *priv = dev_get_priv(clk->dev);
  24
  25         if (clk->id >= MAX_CLKS)
  26                 return -EINVAL;
  27
  28         setbits_be32(priv->regs, BIT(clk->id));
  29
  30         return 0;
  31 }
  32
  33 static int bcm6345_clk_disable(struct clk *clk)
  34 {
  35         struct bcm6345_clk_priv *priv = dev_get_priv(clk->dev);
  36
  37         if (clk->id >= MAX_CLKS)
  38                 return -EINVAL;
  39
  40         clrbits_be32(priv->regs, BIT(clk->id));
  41
  42         return 0;
  43 }
  44
  45 static struct clk_ops bcm6345_clk_ops = {
  46         .disable = bcm6345_clk_disable,
  47         .enable = bcm6345_clk_enable,
  48 };
  49
  50 static const struct udevice_id bcm6345_clk_ids[] = {
  51         { .compatible = "brcm,bcm6345-clk" },
  52         { /* sentinel */ }
  53 };
  54
  55 static int bcm63xx_clk_probe(struct udevice *dev)
  56 {
  57         struct bcm6345_clk_priv *priv = dev_get_priv(dev);
  58         fdt_addr_t addr;
  59         fdt_size_t size;
  60
  61         addr = devfdt_get_addr_size_index(dev, 0, &size);
  62         if (addr == FDT_ADDR_T_NONE)
  63                 return -EINVAL;
  64
  65         priv->regs = ioremap(addr, size);
  66
  67         return 0;
  68 }
  69
  70 U_BOOT_DRIVER(clk_bcm6345) = {
  71         .name = "clk_bcm6345",
  72         .id = UCLASS_CLK,
  73         .of_match = bcm6345_clk_ids,
  74         .ops = &bcm6345_clk_ops,
  75         .probe = bcm63xx_clk_probe,
  76         .priv_auto_alloc_size = sizeof(struct bcm6345_clk_priv),
  77 };