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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/clk/mediatek/clk-cpumux.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/clk/mediatek/clk-cpumux.c')
-rw-r--r--drivers/clk/mediatek/clk-cpumux.c172
1 files changed, 172 insertions, 0 deletions
diff --git a/drivers/clk/mediatek/clk-cpumux.c b/drivers/clk/mediatek/clk-cpumux.c
new file mode 100644
index 000000000..25618eff6
--- /dev/null
+++ b/drivers/clk/mediatek/clk-cpumux.c
@@ -0,0 +1,172 @@
+// 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_hw *
+mtk_clk_register_cpumux(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(NULL, &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_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(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");