LXR uboot/drivers/clk/clk

   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
  17struct bcm6345_clk_priv {
  18        void __iomem *regs;
  19};
  20
  21static 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
  33static 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
  45static struct clk_ops bcm6345_clk_ops = {
  46        .disable = bcm6345_clk_disable,
  47        .enable = bcm6345_clk_enable,
  48};
  49
  50static const struct udevice_id bcm6345_clk_ids[] = {
  51        { .compatible = "brcm,bcm6345-clk" },
  52        { /* sentinel */ }
  53};
  54
  55static 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
  70U_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};
  78