LXR uboot/drivers/clk/clk

   1/*
   2 * Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
   3 *
   4 * Derived from linux/arch/mips/bcm63xx/clk.c:
   5 *      Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
   6 *
   7 * SPDX-License-Identifier:     GPL-2.0+
   8 */
   9
  10#include <common.h>
  11#include <clk-uclass.h>
  12#include <dm.h>
  13#include <errno.h>
  14#include <asm/io.h>
  15
  16#define MAX_CLKS        32
  17
  18struct bcm6345_clk_priv {
  19        void __iomem *regs;
  20};
  21
  22static 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
  34static 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
  46static struct clk_ops bcm6345_clk_ops = {
  47        .disable = bcm6345_clk_disable,
  48        .enable = bcm6345_clk_enable,
  49};
  50
  51static const struct udevice_id bcm6345_clk_ids[] = {
  52        { .compatible = "brcm,bcm6345-clk" },
  53        { /* sentinel */ }
  54};
  55
  56static int bcm63xx_clk_probe(struct udevice *dev)
  57{
  58        struct bcm6345_clk_priv *priv = dev_get_priv(dev);
  59        fdt_addr_t addr;
  60        fdt_size_t size;
  61
  62        addr = devfdt_get_addr_size_index(dev, 0, &size);
  63        if (addr == FDT_ADDR_T_NONE)
  64                return -EINVAL;
  65
  66        priv->regs = ioremap(addr, size);
  67
  68        return 0;
  69}
  70
  71U_BOOT_DRIVER(clk_bcm6345) = {
  72        .name = "clk_bcm6345",
  73        .id = UCLASS_CLK,
  74        .of_match = bcm6345_clk_ids,
  75        .ops = &bcm6345_clk_ops,
  76        .probe = bcm63xx_clk_probe,
  77        .priv_auto_alloc_size = sizeof(struct bcm6345_clk_priv),
  78};
  79