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// SPDX-License-Identifier: GPL-2.0
/*
*/
#define pr_fmt(fmt) "imx:clk-gpr-mux: " fmt
#include <linux/module.h>
#include <linux/clk-provider.h>
#include <linux/errno.h>
#include <linux/export.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/regmap.h>
#include <linux/mfd/syscon.h>
#include "clk.h"
struct imx_clk_gpr {
struct clk_hw hw;
struct regmap *regmap;
u32 mask;
u32 reg;
const u32 *mux_table;
};
static struct imx_clk_gpr *to_imx_clk_gpr(struct clk_hw *hw)
{
return container_of(hw, struct imx_clk_gpr, hw);
}
static u8 imx_clk_gpr_mux_get_parent(struct clk_hw *hw)
{
struct imx_clk_gpr *priv = to_imx_clk_gpr(hw);
unsigned int val;
int ret;
ret = regmap_read(priv->regmap, priv->reg, &val);
if (ret)
goto get_parent_err;
val &= priv->mask;
ret = clk_mux_val_to_index(hw, priv->mux_table, 0, val);
if (ret < 0)
goto get_parent_err;
return ret;
get_parent_err:
pr_err("failed to get parent (%pe)\n", ERR_PTR(ret));
/* return some realistic non negative value. Potentially we could
* give index to some dummy error parent.
*/
return 0;
}
static int imx_clk_gpr_mux_set_parent(struct clk_hw *hw, u8 index)
{
struct imx_clk_gpr *priv = to_imx_clk_gpr(hw);
unsigned int val = clk_mux_index_to_val(priv->mux_table, 0, index);
return regmap_update_bits(priv->regmap, priv->reg, priv->mask, val);
}
static int imx_clk_gpr_mux_determine_rate(struct clk_hw *hw,
struct clk_rate_request *req)
{
return clk_mux_determine_rate_flags(hw, req, 0);
}
static const struct clk_ops imx_clk_gpr_mux_ops = {
.get_parent = imx_clk_gpr_mux_get_parent,
.set_parent = imx_clk_gpr_mux_set_parent,
.determine_rate = imx_clk_gpr_mux_determine_rate,
};
struct clk_hw *imx_clk_gpr_mux(const char *name, const char *compatible,
u32 reg, const char **parent_names,
u8 num_parents, const u32 *mux_table, u32 mask)
{
struct clk_init_data init = { };
struct imx_clk_gpr *priv;
struct regmap *regmap;
struct clk_hw *hw;
int ret;
regmap = syscon_regmap_lookup_by_compatible(compatible);
if (IS_ERR(regmap)) {
pr_err("failed to find %s regmap\n", compatible);
return ERR_CAST(regmap);
}
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv)
return ERR_PTR(-ENOMEM);
init.name = name;
init.ops = &imx_clk_gpr_mux_ops;
init.parent_names = parent_names;
init.num_parents = num_parents;
init.flags = CLK_SET_RATE_GATE | CLK_SET_PARENT_GATE;
priv->hw.init = &init;
priv->regmap = regmap;
priv->mux_table = mux_table;
priv->reg = reg;
priv->mask = mask;
hw = &priv->hw;
ret = clk_hw_register(NULL, &priv->hw);
if (ret) {
kfree(priv);
hw = ERR_PTR(ret);
}
return hw;
}
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