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
  59        priv->regs = dev_remap_addr(dev);
  60        if (!priv->regs)
  61                return -EINVAL;
  62
  63        return 0;
  64}
  65
  66U_BOOT_DRIVER(clk_bcm6345) = {
  67        .name = "clk_bcm6345",
  68        .id = UCLASS_CLK,
  69        .of_match = bcm6345_clk_ids,
  70        .ops = &bcm6345_clk_ops,
  71        .probe = bcm63xx_clk_probe,
  72        .priv_auto_alloc_size = sizeof(struct bcm6345_clk_priv),
  73};
  74