LXR linux/drivers/clk/mediatek/clk-cpumux.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Copyright (c) 2015 Linaro Ltd.
   4 * Author: Pi-Cheng Chen <pi-cheng.chen@linaro.org>
   5 */
   6
   7#include <linux/clk-provider.h>
   8#include <linux/mfd/syscon.h>
   9#include <linux/slab.h>
  10
  11#include "clk-mtk.h"
  12#include "clk-cpumux.h"
  13
  14static inline struct mtk_clk_cpumux *to_mtk_clk_cpumux(struct clk_hw *_hw)
  15{
  16        return container_of(_hw, struct mtk_clk_cpumux, hw);
  17}
  18
  19static u8 clk_cpumux_get_parent(struct clk_hw *hw)
  20{
  21        struct mtk_clk_cpumux *mux = to_mtk_clk_cpumux(hw);
  22        unsigned int val;
  23
  24        regmap_read(mux->regmap, mux->reg, &val);
  25
  26        val >>= mux->shift;
  27        val &= mux->mask;
  28
  29        return val;
  30}
  31
  32static int clk_cpumux_set_parent(struct clk_hw *hw, u8 index)
  33{
  34        struct mtk_clk_cpumux *mux = to_mtk_clk_cpumux(hw);
  35        u32 mask, val;
  36
  37        val = index << mux->shift;
  38        mask = mux->mask << mux->shift;
  39
  40        return regmap_update_bits(mux->regmap, mux->reg, mask, val);
  41}
  42
  43static const struct clk_ops clk_cpumux_ops = {
  44        .get_parent = clk_cpumux_get_parent,
  45        .set_parent = clk_cpumux_set_parent,
  46};
  47
  48static struct clk *
  49mtk_clk_register_cpumux(const struct mtk_composite *mux,
  50                        struct regmap *regmap)
  51{
  52        struct mtk_clk_cpumux *cpumux;
  53        struct clk *clk;
  54        struct clk_init_data init;
  55
  56        cpumux = kzalloc(sizeof(*cpumux), GFP_KERNEL);
  57        if (!cpumux)
  58                return ERR_PTR(-ENOMEM);
  59
  60        init.name = mux->name;
  61        init.ops = &clk_cpumux_ops;
  62        init.parent_names = mux->parent_names;
  63        init.num_parents = mux->num_parents;
  64        init.flags = mux->flags;
  65
  66        cpumux->reg = mux->mux_reg;
  67        cpumux->shift = mux->mux_shift;
  68        cpumux->mask = BIT(mux->mux_width) - 1;
  69        cpumux->regmap = regmap;
  70        cpumux->hw.init = &init;
  71
  72        clk = clk_register(NULL, &cpumux->hw);
  73        if (IS_ERR(clk))
  74                kfree(cpumux);
  75
  76        return clk;
  77}
  78
  79int mtk_clk_register_cpumuxes(struct device_node *node,
  80                              const struct mtk_composite *clks, int num,
  81                              struct clk_onecell_data *clk_data)
  82{
  83        int i;
  84        struct clk *clk;
  85        struct regmap *regmap;
  86
  87        regmap = device_node_to_regmap(node);
  88        if (IS_ERR(regmap)) {
  89                pr_err("Cannot find regmap for %pOF: %ld\n", node,
  90                       PTR_ERR(regmap));
  91                return PTR_ERR(regmap);
  92        }
  93
  94        for (i = 0; i < num; i++) {
  95                const struct mtk_composite *mux = &clks[i];
  96
  97                clk = mtk_clk_register_cpumux(mux, regmap);
  98                if (IS_ERR(clk)) {
  99                        pr_err("Failed to register clk %s: %ld\n",
 100                               mux->name, PTR_ERR(clk));
 101                        continue;
 102                }
 103
 104                clk_data->clks[mux->id] = clk;
 105        }
 106
 107        return 0;
 108}
 109