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8f8f484b PG |
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 | ||
23 | static 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 | ||
31 | static 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 | ||
42 | static 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 | ||
51 | const 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 | ||
57 | struct 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 | } |