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	.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}