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  */
  21 struct clk_fixup_mux {
  22         struct clk_mux mux;
  23         const struct clk_ops *ops;
  24         void (*fixup)(u32 *val);
  25 };
  26
  27 static 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
  34 static 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
  41 static 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 = 0;
  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
  61 static 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
  66 struct 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 }