LXR linux/drivers/clk/imx/clk-fixup-mux.c

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