1/*
2 * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
15 */
16
17#include <linux/clk-provider.h>
18#include <linux/slab.h>
19#include <linux/err.h>
20
21#include "clk.h"
22
23static unsigned long clk_sync_source_recalc_rate(struct clk_hw *hw,
24						 unsigned long parent_rate)
25{
26	struct tegra_clk_sync_source *sync = to_clk_sync_source(hw);
27
28	return sync->rate;
29}
30
31static long clk_sync_source_round_rate(struct clk_hw *hw, unsigned long rate,
32				       unsigned long *prate)
33{
34	struct tegra_clk_sync_source *sync = to_clk_sync_source(hw);
35
36	if (rate > sync->max_rate)
37		return -EINVAL;
38	else
39		return rate;
40}
41
42static int clk_sync_source_set_rate(struct clk_hw *hw, unsigned long rate,
43				    unsigned long parent_rate)
44{
45	struct tegra_clk_sync_source *sync = to_clk_sync_source(hw);
46
47	sync->rate = rate;
48	return 0;
49}
50
51const struct clk_ops tegra_clk_sync_source_ops = {
52	.round_rate = clk_sync_source_round_rate,
53	.set_rate = clk_sync_source_set_rate,
54	.recalc_rate = clk_sync_source_recalc_rate,
55};
56
57struct clk *tegra_clk_register_sync_source(const char *name,
58		unsigned long rate, unsigned long max_rate)
59{
60	struct tegra_clk_sync_source *sync;
61	struct clk_init_data init;
62	struct clk *clk;
63
64	sync = kzalloc(sizeof(*sync), GFP_KERNEL);
65	if (!sync) {
66		pr_err("%s: could not allocate sync source clk\n", __func__);
67		return ERR_PTR(-ENOMEM);
68	}
69
70	sync->rate = rate;
71	sync->max_rate = max_rate;
72
73	init.ops = &tegra_clk_sync_source_ops;
74	init.name = name;
75	init.flags = CLK_IS_ROOT;
76	init.parent_names = NULL;
77	init.num_parents = 0;
78
79	/* Data in .init is copied by clk_register(), so stack variable OK */
80	sync->hw.init = &init;
81
82	clk = clk_register(NULL, &sync->hw);
83	if (IS_ERR(clk))
84		kfree(sync);
85
86	return clk;
87}
88