diff options
Diffstat (limited to 'drivers/clk/mediatek/clk-cpumux.c')
| -rw-r--r-- | drivers/clk/mediatek/clk-cpumux.c | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/drivers/clk/mediatek/clk-cpumux.c b/drivers/clk/mediatek/clk-cpumux.c new file mode 100644 index 0000000000..a03826db4d --- /dev/null +++ b/drivers/clk/mediatek/clk-cpumux.c @@ -0,0 +1,173 @@ +// 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 = { + .determine_rate = clk_hw_determine_rate_no_reparent, + .get_parent = clk_cpumux_get_parent, + .set_parent = clk_cpumux_set_parent, +}; + +static struct clk_hw * +mtk_clk_register_cpumux(struct device *dev, const struct mtk_composite *mux, + struct regmap *regmap) +{ + struct mtk_clk_cpumux *cpumux; + int ret; + 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; + + ret = clk_hw_register(dev, &cpumux->hw); + if (ret) { + kfree(cpumux); + return ERR_PTR(ret); + } + + return &cpumux->hw; +} + +static void mtk_clk_unregister_cpumux(struct clk_hw *hw) +{ + struct mtk_clk_cpumux *cpumux; + if (!hw) + return; + + cpumux = to_mtk_clk_cpumux(hw); + + clk_hw_unregister(hw); + kfree(cpumux); +} + +int mtk_clk_register_cpumuxes(struct device *dev, struct device_node *node, + const struct mtk_composite *clks, int num, + struct clk_hw_onecell_data *clk_data) +{ + int i; + struct clk_hw *hw; + 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; + } + + hw = mtk_clk_register_cpumux(dev, mux, regmap); + if (IS_ERR(hw)) { + pr_err("Failed to register clk %s: %pe\n", mux->name, + hw); + goto err; + } + + clk_data->hws[mux->id] = hw; + } + + 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_data->hws[mux->id] = ERR_PTR(-ENOENT); + } + + return PTR_ERR(hw); +} +EXPORT_SYMBOL_GPL(mtk_clk_register_cpumuxes); + +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_data->hws[mux->id] = ERR_PTR(-ENOENT); + } +} +EXPORT_SYMBOL_GPL(mtk_clk_unregister_cpumuxes); + +MODULE_LICENSE("GPL"); |