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path: root/drivers/clk/imx/clk-fixup-mux.c
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-rw-r--r--drivers/clk/imx/clk-fixup-mux.c106
1 files changed, 106 insertions, 0 deletions
diff --git a/drivers/clk/imx/clk-fixup-mux.c b/drivers/clk/imx/clk-fixup-mux.c
new file mode 100644
index 000000000..c82401570
--- /dev/null
+++ b/drivers/clk/imx/clk-fixup-mux.c
@@ -0,0 +1,106 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2013 Freescale Semiconductor, Inc.
+ */
+
+#include <linux/bits.h>
+#include <linux/clk-provider.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include "clk.h"
+
+/**
+ * struct clk_fixup_mux - imx integer fixup multiplexer clock
+ * @mux: the parent class
+ * @ops: pointer to clk_ops of parent class
+ * @fixup: a hook to fixup the write value
+ *
+ * The imx fixup multiplexer clock is a subclass of basic clk_mux
+ * with an addtional fixup hook.
+ */
+struct clk_fixup_mux {
+ struct clk_mux mux;
+ const struct clk_ops *ops;
+ void (*fixup)(u32 *val);
+};
+
+static inline struct clk_fixup_mux *to_clk_fixup_mux(struct clk_hw *hw)
+{
+ struct clk_mux *mux = to_clk_mux(hw);
+
+ return container_of(mux, struct clk_fixup_mux, mux);
+}
+
+static u8 clk_fixup_mux_get_parent(struct clk_hw *hw)
+{
+ struct clk_fixup_mux *fixup_mux = to_clk_fixup_mux(hw);
+
+ return fixup_mux->ops->get_parent(&fixup_mux->mux.hw);
+}
+
+static int clk_fixup_mux_set_parent(struct clk_hw *hw, u8 index)
+{
+ struct clk_fixup_mux *fixup_mux = to_clk_fixup_mux(hw);
+ struct clk_mux *mux = to_clk_mux(hw);
+ unsigned long flags;
+ u32 val;
+
+ spin_lock_irqsave(mux->lock, flags);
+
+ val = readl(mux->reg);
+ val &= ~(mux->mask << mux->shift);
+ val |= index << mux->shift;
+ fixup_mux->fixup(&val);
+ writel(val, mux->reg);
+
+ spin_unlock_irqrestore(mux->lock, flags);
+
+ return 0;
+}
+
+static const struct clk_ops clk_fixup_mux_ops = {
+ .get_parent = clk_fixup_mux_get_parent,
+ .set_parent = clk_fixup_mux_set_parent,
+};
+
+struct clk_hw *imx_clk_hw_fixup_mux(const char *name, void __iomem *reg,
+ u8 shift, u8 width, const char * const *parents,
+ int num_parents, void (*fixup)(u32 *val))
+{
+ struct clk_fixup_mux *fixup_mux;
+ struct clk_hw *hw;
+ struct clk_init_data init;
+ int ret;
+
+ if (!fixup)
+ return ERR_PTR(-EINVAL);
+
+ fixup_mux = kzalloc(sizeof(*fixup_mux), GFP_KERNEL);
+ if (!fixup_mux)
+ return ERR_PTR(-ENOMEM);
+
+ init.name = name;
+ init.ops = &clk_fixup_mux_ops;
+ init.parent_names = parents;
+ init.num_parents = num_parents;
+ init.flags = 0;
+
+ fixup_mux->mux.reg = reg;
+ fixup_mux->mux.shift = shift;
+ fixup_mux->mux.mask = BIT(width) - 1;
+ fixup_mux->mux.lock = &imx_ccm_lock;
+ fixup_mux->mux.hw.init = &init;
+ fixup_mux->ops = &clk_mux_ops;
+ fixup_mux->fixup = fixup;
+
+ hw = &fixup_mux->mux.hw;
+
+ ret = clk_hw_register(NULL, hw);
+ if (ret) {
+ kfree(fixup_mux);
+ return ERR_PTR(ret);
+ }
+
+ return hw;
+}