linux/drivers/clk/imx/clk-fixup-mux.c
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   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * Copyright (C) 2013 Freescale Semiconductor, Inc.
   4 */
   5
   6#include <linux/bits.h>
   7#include <linux/clk-provider.h>
   8#include <linux/err.h>
   9#include <linux/io.h>
  10#include <linux/slab.h>
  11#include "clk.h"
  12
  13/**
  14 * struct clk_fixup_mux - imx integer fixup multiplexer clock
  15 * @mux: the parent class
  16 * @ops: pointer to clk_ops of parent class
  17 * @fixup: a hook to fixup the write value
  18 *
  19 * The imx fixup multiplexer clock is a subclass of basic clk_mux
  20 * with an addtional fixup hook.
  21 */
  22struct clk_fixup_mux {
  23        struct clk_mux mux;
  24        const struct clk_ops *ops;
  25        void (*fixup)(u32 *val);
  26};
  27
  28static inline struct clk_fixup_mux *to_clk_fixup_mux(struct clk_hw *hw)
  29{
  30        struct clk_mux *mux = to_clk_mux(hw);
  31
  32        return container_of(mux, struct clk_fixup_mux, mux);
  33}
  34
  35static u8 clk_fixup_mux_get_parent(struct clk_hw *hw)
  36{
  37        struct clk_fixup_mux *fixup_mux = to_clk_fixup_mux(hw);
  38
  39        return fixup_mux->ops->get_parent(&fixup_mux->mux.hw);
  40}
  41
  42static int clk_fixup_mux_set_parent(struct clk_hw *hw, u8 index)
  43{
  44        struct clk_fixup_mux *fixup_mux = to_clk_fixup_mux(hw);
  45        struct clk_mux *mux = to_clk_mux(hw);
  46        unsigned long flags;
  47        u32 val;
  48
  49        spin_lock_irqsave(mux->lock, flags);
  50
  51        val = readl(mux->reg);
  52        val &= ~(mux->mask << mux->shift);
  53        val |= index << mux->shift;
  54        fixup_mux->fixup(&val);
  55        writel(val, mux->reg);
  56
  57        spin_unlock_irqrestore(mux->lock, flags);
  58
  59        return 0;
  60}
  61
  62static const struct clk_ops clk_fixup_mux_ops = {
  63        .get_parent = clk_fixup_mux_get_parent,
  64        .set_parent = clk_fixup_mux_set_parent,
  65};
  66
  67struct clk_hw *imx_clk_hw_fixup_mux(const char *name, void __iomem *reg,
  68                              u8 shift, u8 width, const char * const *parents,
  69                              int num_parents, void (*fixup)(u32 *val))
  70{
  71        struct clk_fixup_mux *fixup_mux;
  72        struct clk_hw *hw;
  73        struct clk_init_data init;
  74        int ret;
  75
  76        if (!fixup)
  77                return ERR_PTR(-EINVAL);
  78
  79        fixup_mux = kzalloc(sizeof(*fixup_mux), GFP_KERNEL);
  80        if (!fixup_mux)
  81                return ERR_PTR(-ENOMEM);
  82
  83        init.name = name;
  84        init.ops = &clk_fixup_mux_ops;
  85        init.parent_names = parents;
  86        init.num_parents = num_parents;
  87        init.flags = 0;
  88
  89        fixup_mux->mux.reg = reg;
  90        fixup_mux->mux.shift = shift;
  91        fixup_mux->mux.mask = BIT(width) - 1;
  92        fixup_mux->mux.lock = &imx_ccm_lock;
  93        fixup_mux->mux.hw.init = &init;
  94        fixup_mux->ops = &clk_mux_ops;
  95        fixup_mux->fixup = fixup;
  96
  97        hw = &fixup_mux->mux.hw;
  98
  99        ret = clk_hw_register(NULL, hw);
 100        if (ret) {
 101                kfree(fixup_mux);
 102                return ERR_PTR(ret);
 103        }
 104
 105        return hw;
 106}
 107