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path: root/drivers/clk/sunxi/clk-sun8i-mbus.c
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Diffstat (limited to 'drivers/clk/sunxi/clk-sun8i-mbus.c')
-rw-r--r--drivers/clk/sunxi/clk-sun8i-mbus.c109
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 000000000..539ea2788
--- /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);