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