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/bitops.h>
  16 #include <linux/log2.h>
  17
  18 static const struct ccu_clk_gate *priv_to_gate(struct ccu_priv *priv,
  19                                                unsigned long id)
  20 {
  21         return &priv->desc->gates[id];
  22 }
  23
  24 static int sunxi_set_gate(struct clk *clk, bool on)
  25 {
  26         struct ccu_priv *priv = dev_get_priv(clk->dev);
  27         const struct ccu_clk_gate *gate = priv_to_gate(priv, clk->id);
  28         u32 reg;
  29
  30         if (!(gate->flags & CCU_CLK_F_IS_VALID)) {
  31                 printf("%s: (CLK#%ld) unhandled\n", __func__, clk->id);
  32                 return 0;
  33         }
  34
  35         debug("%s: (CLK#%ld) off#0x%x, BIT(%d)\n", __func__,
  36               clk->id, gate->off, ilog2(gate->bit));
  37
  38         reg = readl(priv->base + gate->off);
  39         if (on)
  40                 reg |= gate->bit;
  41         else
  42                 reg &= ~gate->bit;
  43
  44         writel(reg, priv->base + gate->off);
  45
  46         return 0;
  47 }
  48
  49 static int sunxi_clk_enable(struct clk *clk)
  50 {
  51         return sunxi_set_gate(clk, true);
  52 }
  53
  54 static int sunxi_clk_disable(struct clk *clk)
  55 {
  56         return sunxi_set_gate(clk, false);
  57 }
  58
  59 struct clk_ops sunxi_clk_ops = {
  60         .enable = sunxi_clk_enable,
  61         .disable = sunxi_clk_disable,
  62 };
  63
  64 int sunxi_clk_probe(struct udevice *dev)
  65 {
  66         struct ccu_priv *priv = dev_get_priv(dev);
  67         struct clk_bulk clk_bulk;
  68         struct reset_ctl_bulk rst_bulk;
  69         int ret;
  70
  71         priv->base = dev_read_addr_ptr(dev);
  72         if (!priv->base)
  73                 return -ENOMEM;
  74
  75         priv->desc = (const struct ccu_desc *)dev_get_driver_data(dev);
  76         if (!priv->desc)
  77                 return -EINVAL;
  78
  79         ret = clk_get_bulk(dev, &clk_bulk);
  80         if (!ret)
  81                 clk_enable_bulk(&clk_bulk);
  82
  83         ret = reset_get_bulk(dev, &rst_bulk);
  84         if (!ret)
  85                 reset_deassert_bulk(&rst_bulk);
  86
  87         return 0;
  88 }