drivers/clk/sunxi/clk_sunxi.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2018 Amarula Solutions.
   4  * Author: Jagan Teki <jagan@amarulasolutions.com>
   5  */
   6
   7 #include <common.h>
   8 #include <clk-uclass.h>
   9 #include <dm.h>
  10 #include <errno.h>
  11 #include <asm/io.h>
  12 #include <asm/arch/ccu.h>
  13 #include <linux/log2.h>
  14
  15 static const struct ccu_clk_gate *priv_to_gate(struct ccu_priv *priv,
  16                                                unsigned long id)
  17 {
  18         return &priv->desc->gates[id];
  19 }
  20
  21 static int sunxi_set_gate(struct clk *clk, bool on)
  22 {
  23         struct ccu_priv *priv = dev_get_priv(clk->dev);
  24         const struct ccu_clk_gate *gate = priv_to_gate(priv, clk->id);
  25         u32 reg;
  26
  27         if (!(gate->flags & CCU_CLK_F_IS_VALID)) {
  28                 printf("%s: (CLK#%ld) unhandled\n", __func__, clk->id);
  29                 return 0;
  30         }
  31
  32         debug("%s: (CLK#%ld) off#0x%x, BIT(%d)\n", __func__,
  33               clk->id, gate->off, ilog2(gate->bit));
  34
  35         reg = readl(priv->base + gate->off);
  36         if (on)
  37                 reg |= gate->bit;
  38         else
  39                 reg &= ~gate->bit;
  40
  41         writel(reg, priv->base + gate->off);
  42
  43         return 0;
  44 }
  45
  46 static int sunxi_clk_enable(struct clk *clk)
  47 {
  48         return sunxi_set_gate(clk, true);
  49 }
  50
  51 static int sunxi_clk_disable(struct clk *clk)
  52 {
  53         return sunxi_set_gate(clk, false);
  54 }
  55
  56 struct clk_ops sunxi_clk_ops = {
  57         .enable = sunxi_clk_enable,
  58         .disable = sunxi_clk_disable,
  59 };
  60
  61 int sunxi_clk_probe(struct udevice *dev)
  62 {
  63         struct ccu_priv *priv = dev_get_priv(dev);
  64
  65         priv->base = dev_read_addr_ptr(dev);
  66         if (!priv->base)
  67                 return -ENOMEM;
  68
  69         priv->desc = (const struct ccu_desc *)dev_get_driver_data(dev);
  70         if (!priv->desc)
  71                 return -EINVAL;
  72
  73         return 0;
  74 }