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 <log.h>
  12 #include <reset.h>
  13 #include <asm/io.h>
  14 #include <asm/arch/ccu.h>
  15 #include <linux/log2.h>
  16
  17 static const struct ccu_clk_gate *priv_to_gate(struct ccu_priv *priv,
  18                                                unsigned long id)
  19 {
  20         return &priv->desc->gates[id];
  21 }
  22
  23 static int sunxi_set_gate(struct clk *clk, bool on)
  24 {
  25         struct ccu_priv *priv = dev_get_priv(clk->dev);
  26         const struct ccu_clk_gate *gate = priv_to_gate(priv, clk->id);
  27         u32 reg;
  28
  29         if (!(gate->flags & CCU_CLK_F_IS_VALID)) {
  30                 printf("%s: (CLK#%ld) unhandled\n", __func__, clk->id);
  31                 return 0;
  32         }
  33
  34         debug("%s: (CLK#%ld) off#0x%x, BIT(%d)\n", __func__,
  35               clk->id, gate->off, ilog2(gate->bit));
  36
  37         reg = readl(priv->base + gate->off);
  38         if (on)
  39                 reg |= gate->bit;
  40         else
  41                 reg &= ~gate->bit;
  42
  43         writel(reg, priv->base + gate->off);
  44
  45         return 0;
  46 }
  47
  48 static int sunxi_clk_enable(struct clk *clk)
  49 {
  50         return sunxi_set_gate(clk, true);
  51 }
  52
  53 static int sunxi_clk_disable(struct clk *clk)
  54 {
  55         return sunxi_set_gate(clk, false);
  56 }
  57
  58 struct clk_ops sunxi_clk_ops = {
  59         .enable = sunxi_clk_enable,
  60         .disable = sunxi_clk_disable,
  61 };
  62
  63 int sunxi_clk_probe(struct udevice *dev)
  64 {
  65         struct ccu_priv *priv = dev_get_priv(dev);
  66         struct clk_bulk clk_bulk;
  67         struct reset_ctl_bulk rst_bulk;
  68         int ret;
  69
  70         priv->base = dev_read_addr_ptr(dev);
  71         if (!priv->base)
  72                 return -ENOMEM;
  73
  74         priv->desc = (const struct ccu_desc *)dev_get_driver_data(dev);
  75         if (!priv->desc)
  76                 return -EINVAL;
  77
  78         ret = clk_get_bulk(dev, &clk_bulk);
  79         if (!ret)
  80                 clk_enable_bulk(&clk_bulk);
  81
  82         ret = reset_get_bulk(dev, &rst_bulk);
  83         if (!ret)
  84                 reset_deassert_bulk(&rst_bulk);
  85
  86         return 0;
  87 }