1 files changed, 109 insertions, 0 deletions
diff --git a/drivers/clk/sunxi/clk-sun8i-mbus.c b/drivers/clk/sunxi/clk-sun8i-mbus.c
new file mode 100644
index 0000000000..539ea27882
--- /dev/null
+++ b/drivers/clk/sunxi/clk-sun8i-mbus.c
@@ -0,0 +1,109 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright 2014 Chen-Yu Tsai
+ *
+ * Chen-Yu Tsai <wens@csie.org>
+ */
+
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/of_address.h>
+
+#define SUN8I_MBUS_ENABLE	31
+#define SUN8I_MBUS_MUX_SHIFT	24
+#define SUN8I_MBUS_MUX_MASK	0x3
+#define SUN8I_MBUS_DIV_SHIFT	0
+#define SUN8I_MBUS_DIV_WIDTH	3
+#define SUN8I_MBUS_MAX_PARENTS	4
+
+static DEFINE_SPINLOCK(sun8i_a23_mbus_lock);
+
+static void __init sun8i_a23_mbus_setup(struct device_node *node)
+{
+	int num_parents = of_clk_get_parent_count(node);
+	const char **parents;
+	const char *clk_name = node->name;
+	struct resource res;
+	struct clk_divider *div;
+	struct clk_gate *gate;
+	struct clk_mux *mux;
+	struct clk *clk;
+	void __iomem *reg;
+	int err;
+
+	parents = kcalloc(num_parents, sizeof(*parents), GFP_KERNEL);
+	if (!parents)
+		return;
+
+	reg = of_io_request_and_map(node, 0, of_node_full_name(node));
+	if (IS_ERR(reg)) {
+		pr_err("Could not get registers for sun8i-mbus-clk\n");
+		goto err_free_parents;
+	}
+
+	div = kzalloc(sizeof(*div), GFP_KERNEL);
+	if (!div)
+		goto err_unmap;
+
+	mux = kzalloc(sizeof(*mux), GFP_KERNEL);
+	if (!mux)
+		goto err_free_div;
+
+	gate = kzalloc(sizeof(*gate), GFP_KERNEL);
+	if (!gate)
+		goto err_free_mux;
+
+	of_property_read_string(node, "clock-output-names", &clk_name);
+	of_clk_parent_fill(node, parents, num_parents);
+
+	gate->reg = reg;
+	gate->bit_idx = SUN8I_MBUS_ENABLE;
+	gate->lock = &sun8i_a23_mbus_lock;
+
+	div->reg = reg;
+	div->shift = SUN8I_MBUS_DIV_SHIFT;
+	div->width = SUN8I_MBUS_DIV_WIDTH;
+	div->lock = &sun8i_a23_mbus_lock;
+
+	mux->reg = reg;
+	mux->shift = SUN8I_MBUS_MUX_SHIFT;
+	mux->mask = SUN8I_MBUS_MUX_MASK;
+	mux->lock = &sun8i_a23_mbus_lock;
+
+	/* The MBUS clocks needs to be always enabled */
+	clk = clk_register_composite(NULL, clk_name, parents, num_parents,
+				     &mux->hw, &clk_mux_ops,
+				     &div->hw, &clk_divider_ops,
+				     &gate->hw, &clk_gate_ops,
+				     CLK_IS_CRITICAL);
+	if (IS_ERR(clk))
+		goto err_free_gate;
+
+	err = of_clk_add_provider(node, of_clk_src_simple_get, clk);
+	if (err)
+		goto err_unregister_clk;
+
+	kfree(parents); /* parents is deep copied */
+
+	return;
+
+err_unregister_clk:
+	/* TODO: The composite clock stuff will leak a bit here. */
+	clk_unregister(clk);
+err_free_gate:
+	kfree(gate);
+err_free_mux:
+	kfree(mux);
+err_free_div:
+	kfree(div);
+err_unmap:
+	iounmap(reg);
+	of_address_to_resource(node, 0, &res);
+	release_mem_region(res.start, resource_size(&res));
+err_free_parents:
+	kfree(parents);
+}
+CLK_OF_DECLARE(sun8i_a23_mbus, "allwinner,sun8i-a23-mbus-clk", sun8i_a23_mbus_setup);