120 lines
2.6 KiB
C
120 lines
2.6 KiB
C
// 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;
|
|
}
|