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1// SPDX-License-Identifier: GPL-2.02/*3 */4 5#define pr_fmt(fmt) "imx:clk-gpr-mux: " fmt6 7#include <linux/module.h>8 9#include <linux/clk-provider.h>10#include <linux/errno.h>11#include <linux/export.h>12#include <linux/io.h>13#include <linux/slab.h>14#include <linux/regmap.h>15#include <linux/mfd/syscon.h>16 17#include "clk.h"18 19struct imx_clk_gpr {20 struct clk_hw hw;21 struct regmap *regmap;22 u32 mask;23 u32 reg;24 const u32 *mux_table;25};26 27static struct imx_clk_gpr *to_imx_clk_gpr(struct clk_hw *hw)28{29 return container_of(hw, struct imx_clk_gpr, hw);30}31 32static u8 imx_clk_gpr_mux_get_parent(struct clk_hw *hw)33{34 struct imx_clk_gpr *priv = to_imx_clk_gpr(hw);35 unsigned int val;36 int ret;37 38 ret = regmap_read(priv->regmap, priv->reg, &val);39 if (ret)40 goto get_parent_err;41 42 val &= priv->mask;43 44 ret = clk_mux_val_to_index(hw, priv->mux_table, 0, val);45 if (ret < 0)46 goto get_parent_err;47 48 return ret;49 50get_parent_err:51 pr_err("%s: failed to get parent (%pe)\n",52 clk_hw_get_name(hw), ERR_PTR(ret));53 54 /* return some realistic non negative value. Potentially we could55 * give index to some dummy error parent.56 */57 return 0;58}59 60static int imx_clk_gpr_mux_set_parent(struct clk_hw *hw, u8 index)61{62 struct imx_clk_gpr *priv = to_imx_clk_gpr(hw);63 unsigned int val = clk_mux_index_to_val(priv->mux_table, 0, index);64 65 return regmap_update_bits(priv->regmap, priv->reg, priv->mask, val);66}67 68static const struct clk_ops imx_clk_gpr_mux_ops = {69 .get_parent = imx_clk_gpr_mux_get_parent,70 .set_parent = imx_clk_gpr_mux_set_parent,71 .determine_rate = __clk_mux_determine_rate,72};73 74struct clk_hw *imx_clk_gpr_mux(const char *name, const char *compatible,75 u32 reg, const char **parent_names,76 u8 num_parents, const u32 *mux_table, u32 mask)77{78 struct clk_init_data init = { };79 struct imx_clk_gpr *priv;80 struct regmap *regmap;81 struct clk_hw *hw;82 int ret;83 84 regmap = syscon_regmap_lookup_by_compatible(compatible);85 if (IS_ERR(regmap)) {86 pr_err("failed to find %s regmap\n", compatible);87 return ERR_CAST(regmap);88 }89 90 priv = kzalloc(sizeof(*priv), GFP_KERNEL);91 if (!priv)92 return ERR_PTR(-ENOMEM);93 94 init.name = name;95 init.ops = &imx_clk_gpr_mux_ops;96 init.parent_names = parent_names;97 init.num_parents = num_parents;98 init.flags = CLK_SET_RATE_GATE | CLK_SET_PARENT_GATE;99 100 priv->hw.init = &init;101 priv->regmap = regmap;102 priv->mux_table = mux_table;103 priv->reg = reg;104 priv->mask = mask;105 106 hw = &priv->hw;107 ret = clk_hw_register(NULL, &priv->hw);108 if (ret) {109 kfree(priv);110 hw = ERR_PTR(ret);111 }112 113 return hw;114}115