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1// SPDX-License-Identifier: GPL-2.0-or-later2/*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 clock15 * @mux: the parent class16 * @ops: pointer to clk_ops of parent class17 * @fixup: a hook to fixup the write value18 *19 * The imx fixup multiplexer clock is a subclass of basic clk_mux20 * 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 .determine_rate = clk_hw_determine_rate_no_reparent,64 .get_parent = clk_fixup_mux_get_parent,65 .set_parent = clk_fixup_mux_set_parent,66};67 68struct clk_hw *imx_clk_hw_fixup_mux(const char *name, void __iomem *reg,69 u8 shift, u8 width, const char * const *parents,70 int num_parents, void (*fixup)(u32 *val))71{72 struct clk_fixup_mux *fixup_mux;73 struct clk_hw *hw;74 struct clk_init_data init;75 int ret;76 77 if (!fixup)78 return ERR_PTR(-EINVAL);79 80 fixup_mux = kzalloc(sizeof(*fixup_mux), GFP_KERNEL);81 if (!fixup_mux)82 return ERR_PTR(-ENOMEM);83 84 init.name = name;85 init.ops = &clk_fixup_mux_ops;86 init.parent_names = parents;87 init.num_parents = num_parents;88 init.flags = 0;89 90 fixup_mux->mux.reg = reg;91 fixup_mux->mux.shift = shift;92 fixup_mux->mux.mask = BIT(width) - 1;93 fixup_mux->mux.lock = &imx_ccm_lock;94 fixup_mux->mux.hw.init = &init;95 fixup_mux->ops = &clk_mux_ops;96 fixup_mux->fixup = fixup;97 98 hw = &fixup_mux->mux.hw;99 100 ret = clk_hw_register(NULL, hw);101 if (ret) {102 kfree(fixup_mux);103 return ERR_PTR(ret);104 }105 106 return hw;107}108