drivers/clk/rockchip/clk-muxgrf.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2
   3 #include <linux/slab.h>
   4 #include <linux/bitops.h>
   5 #include <linux/regmap.h>
   6 #include <linux/clk.h>
   7 #include <linux/clk-provider.h>
   8 #include "clk.h"
   9
  10 struct rockchip_muxgrf_clock {
  11         struct clk_hw           hw;
  12         struct regmap           *regmap;
  13         u32                     reg;
  14         u32                     shift;
  15         u32                     width;
  16         int                     flags;
  17 };
  18
  19 #define to_muxgrf_clock(_hw) container_of(_hw, struct rockchip_muxgrf_clock, hw)
  20
  21 static u8 rockchip_muxgrf_get_parent(struct clk_hw *hw)
  22 {
  23         struct rockchip_muxgrf_clock *mux = to_muxgrf_clock(hw);
  24         unsigned int mask = GENMASK(mux->width - 1, 0);
  25         unsigned int val;
  26
  27         regmap_read(mux->regmap, mux->reg, &val);
  28
  29         val >>= mux->shift;
  30         val &= mask;
  31
  32         return val;
  33 }
  34
  35 static int rockchip_muxgrf_set_parent(struct clk_hw *hw, u8 index)
  36 {
  37         struct rockchip_muxgrf_clock *mux = to_muxgrf_clock(hw);
  38         unsigned int mask = GENMASK(mux->width + mux->shift - 1, mux->shift);
  39         unsigned int val;
  40
  41         val = index;
  42         val <<= mux->shift;
  43
  44         if (mux->flags & CLK_MUX_HIWORD_MASK)
  45                 return regmap_write(mux->regmap, mux->reg, val | (mask << 16));
  46         else
  47                 return regmap_update_bits(mux->regmap, mux->reg, mask, val);
  48 }
  49
  50 static const struct clk_ops rockchip_muxgrf_clk_ops = {
  51         .get_parent = rockchip_muxgrf_get_parent,
  52         .set_parent = rockchip_muxgrf_set_parent,
  53         .determine_rate = __clk_mux_determine_rate,
  54 };
  55
  56 struct clk *rockchip_clk_register_muxgrf(const char *name,
  57                                 const char *const *parent_names, u8 num_parents,
  58                                 int flags, struct regmap *regmap, int reg,
  59                                 int shift, int width, int mux_flags)
  60 {
  61         struct rockchip_muxgrf_clock *muxgrf_clock;
  62         struct clk_init_data init;
  63         struct clk *clk;
  64
  65         if (IS_ERR(regmap)) {
  66                 pr_err("%s: regmap not available\n", __func__);
  67                 return ERR_PTR(-ENOTSUPP);
  68         }
  69
  70         muxgrf_clock = kmalloc(sizeof(*muxgrf_clock), GFP_KERNEL);
  71         if (!muxgrf_clock)
  72                 return ERR_PTR(-ENOMEM);
  73
  74         init.name = name;
  75         init.flags = flags;
  76         init.num_parents = num_parents;
  77         init.parent_names = parent_names;
  78         init.ops = &rockchip_muxgrf_clk_ops;
  79
  80         muxgrf_clock->hw.init = &init;
  81         muxgrf_clock->regmap = regmap;
  82         muxgrf_clock->reg = reg;
  83         muxgrf_clock->shift = shift;
  84         muxgrf_clock->width = width;
  85         muxgrf_clock->flags = mux_flags;
  86
  87         clk = clk_register(NULL, &muxgrf_clock->hw);
  88         if (IS_ERR(clk))
  89                 kfree(muxgrf_clock);
  90
  91         return clk;
  92 }