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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2015 Linaro Ltd.
* Author: Pi-Cheng Chen <pi-cheng.chen@linaro.org>
*/
#include <linux/clk-provider.h>
#include <linux/container_of.h>
#include <linux/err.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include "clk-mtk.h"
#include "clk-cpumux.h"
struct mtk_clk_cpumux {
struct clk_hw hw;
struct regmap *regmap;
u32 reg;
u32 mask;
u8 shift;
};
static inline struct mtk_clk_cpumux *to_mtk_clk_cpumux(struct clk_hw *_hw)
{
return container_of(_hw, struct mtk_clk_cpumux, hw);
}
static u8 clk_cpumux_get_parent(struct clk_hw *hw)
{
struct mtk_clk_cpumux *mux = to_mtk_clk_cpumux(hw);
unsigned int val;
regmap_read(mux->regmap, mux->reg, &val);
val >>= mux->shift;
val &= mux->mask;
return val;
}
static int clk_cpumux_set_parent(struct clk_hw *hw, u8 index)
{
struct mtk_clk_cpumux *mux = to_mtk_clk_cpumux(hw);
u32 mask, val;
val = index << mux->shift;
mask = mux->mask << mux->shift;
return regmap_update_bits(mux->regmap, mux->reg, mask, val);
}
static const struct clk_ops clk_cpumux_ops = {
.get_parent = clk_cpumux_get_parent,
.set_parent = clk_cpumux_set_parent,
};
static struct clk *
mtk_clk_register_cpumux(const struct mtk_composite *mux,
struct regmap *regmap)
{
struct mtk_clk_cpumux *cpumux;
struct clk *clk;
struct clk_init_data init;
cpumux = kzalloc(sizeof(*cpumux), GFP_KERNEL);
if (!cpumux)
return ERR_PTR(-ENOMEM);
init.name = mux->name;
init.ops = &clk_cpumux_ops;
init.parent_names = mux->parent_names;
init.num_parents = mux->num_parents;
init.flags = mux->flags;
cpumux->reg = mux->mux_reg;
cpumux->shift = mux->mux_shift;
cpumux->mask = BIT(mux->mux_width) - 1;
cpumux->regmap = regmap;
cpumux->hw.init = &init;
clk = clk_register(NULL, &cpumux->hw);
if (IS_ERR(clk))
kfree(cpumux);
return clk;
}
static void mtk_clk_unregister_cpumux(struct clk *clk)
{
struct mtk_clk_cpumux *cpumux;
struct clk_hw *hw;
hw = __clk_get_hw(clk);
if (!hw)
return;
cpumux = to_mtk_clk_cpumux(hw);
clk_unregister(clk);
kfree(cpumux);
}
int mtk_clk_register_cpumuxes(struct device_node *node,
const struct mtk_composite *clks, int num,
struct clk_hw_onecell_data *clk_data)
{
int i;
struct clk *clk;
struct regmap *regmap;
regmap = device_node_to_regmap(node);
if (IS_ERR(regmap)) {
pr_err("Cannot find regmap for %pOF: %pe\n", node, regmap);
return PTR_ERR(regmap);
}
for (i = 0; i < num; i++) {
const struct mtk_composite *mux = &clks[i];
if (!IS_ERR_OR_NULL(clk_data->hws[mux->id])) {
pr_warn("%pOF: Trying to register duplicate clock ID: %d\n",
node, mux->id);
continue;
}
clk = mtk_clk_register_cpumux(mux, regmap);
if (IS_ERR(clk)) {
pr_err("Failed to register clk %s: %pe\n", mux->name, clk);
goto err;
}
clk_data->hws[mux->id] = __clk_get_hw(clk);
}
return 0;
err:
while (--i >= 0) {
const struct mtk_composite *mux = &clks[i];
if (IS_ERR_OR_NULL(clk_data->hws[mux->id]))
continue;
mtk_clk_unregister_cpumux(clk_data->hws[mux->id]->clk);
clk_data->hws[mux->id] = ERR_PTR(-ENOENT);
}
return PTR_ERR(clk);
}
void mtk_clk_unregister_cpumuxes(const struct mtk_composite *clks, int num,
struct clk_hw_onecell_data *clk_data)
{
int i;
for (i = num; i > 0; i--) {
const struct mtk_composite *mux = &clks[i - 1];
if (IS_ERR_OR_NULL(clk_data->hws[mux->id]))
continue;
mtk_clk_unregister_cpumux(clk_data->hws[mux->id]->clk);
clk_data->hws[mux->id] = ERR_PTR(-ENOENT);
}
}
MODULE_LICENSE("GPL");
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