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path: root/drivers/clk/imx/clk-gpr-mux.c
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Diffstat (limited to 'drivers/clk/imx/clk-gpr-mux.c')
-rw-r--r--drivers/clk/imx/clk-gpr-mux.c114
1 files changed, 114 insertions, 0 deletions
diff --git a/drivers/clk/imx/clk-gpr-mux.c b/drivers/clk/imx/clk-gpr-mux.c
new file mode 100644
index 0000000000..0e14b61cba
--- /dev/null
+++ b/drivers/clk/imx/clk-gpr-mux.c
@@ -0,0 +1,114 @@
+// 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("%s: failed to get parent (%pe)\n",
+ clk_hw_get_name(hw), 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 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 = __clk_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;
+}