xref: /openbmc/linux/drivers/clk/sunxi/clk-a10-mod1.c (revision c942fddf)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Copyright 2013 Emilio López
4  *
5  * Emilio López <emilio@elopez.com.ar>
6  */
7 
8 #include <linux/clk-provider.h>
9 #include <linux/io.h>
10 #include <linux/of.h>
11 #include <linux/of_address.h>
12 #include <linux/slab.h>
13 
14 static DEFINE_SPINLOCK(mod1_lock);
15 
16 #define SUN4I_MOD1_ENABLE	31
17 #define SUN4I_MOD1_MUX		16
18 #define SUN4I_MOD1_MUX_WIDTH	2
19 #define SUN4I_MOD1_MAX_PARENTS	4
20 
sun4i_mod1_clk_setup(struct device_node * node)21 static void __init sun4i_mod1_clk_setup(struct device_node *node)
22 {
23 	struct clk *clk;
24 	struct clk_mux *mux;
25 	struct clk_gate *gate;
26 	const char *parents[4];
27 	const char *clk_name = node->name;
28 	void __iomem *reg;
29 	int i;
30 
31 	reg = of_io_request_and_map(node, 0, of_node_full_name(node));
32 	if (IS_ERR(reg))
33 		return;
34 
35 	mux = kzalloc(sizeof(*mux), GFP_KERNEL);
36 	if (!mux)
37 		goto err_unmap;
38 
39 	gate = kzalloc(sizeof(*gate), GFP_KERNEL);
40 	if (!gate)
41 		goto err_free_mux;
42 
43 	of_property_read_string(node, "clock-output-names", &clk_name);
44 	i = of_clk_parent_fill(node, parents, SUN4I_MOD1_MAX_PARENTS);
45 
46 	gate->reg = reg;
47 	gate->bit_idx = SUN4I_MOD1_ENABLE;
48 	gate->lock = &mod1_lock;
49 	mux->reg = reg;
50 	mux->shift = SUN4I_MOD1_MUX;
51 	mux->mask = BIT(SUN4I_MOD1_MUX_WIDTH) - 1;
52 	mux->lock = &mod1_lock;
53 
54 	clk = clk_register_composite(NULL, clk_name, parents, i,
55 				     &mux->hw, &clk_mux_ops,
56 				     NULL, NULL,
57 				     &gate->hw, &clk_gate_ops, CLK_SET_RATE_PARENT);
58 	if (IS_ERR(clk))
59 		goto err_free_gate;
60 
61 	of_clk_add_provider(node, of_clk_src_simple_get, clk);
62 
63 	return;
64 
65 err_free_gate:
66 	kfree(gate);
67 err_free_mux:
68 	kfree(mux);
69 err_unmap:
70 	iounmap(reg);
71 }
72 CLK_OF_DECLARE(sun4i_mod1, "allwinner,sun4i-a10-mod1-clk",
73 	       sun4i_mod1_clk_setup);
74