1/*
2 * Copyright 2013 Emilio López
3 *
4 * Emilio López <emilio@elopez.com.ar>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14 * GNU General Public License for more details.
15 */
16
17#include <linux/clk-provider.h>
18#include <linux/clkdev.h>
19#include <linux/of.h>
20#include <linux/of_address.h>
21
22#define SUNXI_OSC24M_GATE	0
23
24static DEFINE_SPINLOCK(hosc_lock);
25
26static void __init sun4i_osc_clk_setup(struct device_node *node)
27{
28	struct clk *clk;
29	struct clk_fixed_rate *fixed;
30	struct clk_gate *gate;
31	const char *clk_name = node->name;
32	u32 rate;
33
34	if (of_property_read_u32(node, "clock-frequency", &rate))
35		return;
36
37	/* allocate fixed-rate and gate clock structs */
38	fixed = kzalloc(sizeof(struct clk_fixed_rate), GFP_KERNEL);
39	if (!fixed)
40		return;
41	gate = kzalloc(sizeof(struct clk_gate), GFP_KERNEL);
42	if (!gate)
43		goto err_free_fixed;
44
45	of_property_read_string(node, "clock-output-names", &clk_name);
46
47	/* set up gate and fixed rate properties */
48	gate->reg = of_iomap(node, 0);
49	gate->bit_idx = SUNXI_OSC24M_GATE;
50	gate->lock = &hosc_lock;
51	fixed->fixed_rate = rate;
52
53	clk = clk_register_composite(NULL, clk_name,
54			NULL, 0,
55			NULL, NULL,
56			&fixed->hw, &clk_fixed_rate_ops,
57			&gate->hw, &clk_gate_ops,
58			CLK_IS_ROOT);
59
60	if (IS_ERR(clk))
61		goto err_free_gate;
62
63	of_clk_add_provider(node, of_clk_src_simple_get, clk);
64	clk_register_clkdev(clk, clk_name, NULL);
65
66	return;
67
68err_free_gate:
69	kfree(gate);
70err_free_fixed:
71	kfree(fixed);
72}
73CLK_OF_DECLARE(sun4i_osc, "allwinner,sun4i-a10-osc-clk", sun4i_osc_clk_setup);
74