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ed27ff1d PM |
1 | /* |
2 | * This program is free software; you can redistribute it and/or modify | |
3 | * it under the terms of the GNU General Public License version 2 as | |
4 | * published by the Free Software Foundation. | |
5 | * | |
6 | * This program is distributed in the hope that it will be useful, | |
7 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
8 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
9 | * GNU General Public License for more details. | |
10 | * | |
11 | * Copyright (C) 2012 ARM Limited | |
12 | */ | |
13 | ||
14 | #define pr_fmt(fmt) "vexpress-osc: " fmt | |
15 | ||
16 | #include <linux/clkdev.h> | |
17 | #include <linux/clk-provider.h> | |
18 | #include <linux/err.h> | |
19 | #include <linux/of.h> | |
20 | #include <linux/platform_device.h> | |
21 | #include <linux/slab.h> | |
22 | #include <linux/vexpress.h> | |
23 | ||
24 | struct vexpress_osc { | |
25 | struct vexpress_config_func *func; | |
26 | struct clk_hw hw; | |
27 | unsigned long rate_min; | |
28 | unsigned long rate_max; | |
29 | }; | |
30 | ||
31 | #define to_vexpress_osc(osc) container_of(osc, struct vexpress_osc, hw) | |
32 | ||
33 | static unsigned long vexpress_osc_recalc_rate(struct clk_hw *hw, | |
34 | unsigned long parent_rate) | |
35 | { | |
36 | struct vexpress_osc *osc = to_vexpress_osc(hw); | |
37 | u32 rate; | |
38 | ||
39 | vexpress_config_read(osc->func, 0, &rate); | |
40 | ||
41 | return rate; | |
42 | } | |
43 | ||
44 | static long vexpress_osc_round_rate(struct clk_hw *hw, unsigned long rate, | |
45 | unsigned long *parent_rate) | |
46 | { | |
47 | struct vexpress_osc *osc = to_vexpress_osc(hw); | |
48 | ||
49 | if (WARN_ON(osc->rate_min && rate < osc->rate_min)) | |
50 | rate = osc->rate_min; | |
51 | ||
52 | if (WARN_ON(osc->rate_max && rate > osc->rate_max)) | |
53 | rate = osc->rate_max; | |
54 | ||
55 | return rate; | |
56 | } | |
57 | ||
58 | static int vexpress_osc_set_rate(struct clk_hw *hw, unsigned long rate, | |
59 | unsigned long parent_rate) | |
60 | { | |
61 | struct vexpress_osc *osc = to_vexpress_osc(hw); | |
62 | ||
63 | return vexpress_config_write(osc->func, 0, rate); | |
64 | } | |
65 | ||
66 | static struct clk_ops vexpress_osc_ops = { | |
67 | .recalc_rate = vexpress_osc_recalc_rate, | |
68 | .round_rate = vexpress_osc_round_rate, | |
69 | .set_rate = vexpress_osc_set_rate, | |
70 | }; | |
71 | ||
72 | ||
73 | struct clk * __init vexpress_osc_setup(struct device *dev) | |
74 | { | |
75 | struct clk_init_data init; | |
76 | struct vexpress_osc *osc = kzalloc(sizeof(*osc), GFP_KERNEL); | |
77 | ||
78 | if (!osc) | |
79 | return NULL; | |
80 | ||
81 | osc->func = vexpress_config_func_get_by_dev(dev); | |
82 | if (!osc->func) { | |
83 | kfree(osc); | |
84 | return NULL; | |
85 | } | |
86 | ||
87 | init.name = dev_name(dev); | |
88 | init.ops = &vexpress_osc_ops; | |
89 | init.flags = CLK_IS_ROOT; | |
90 | init.num_parents = 0; | |
91 | osc->hw.init = &init; | |
92 | ||
93 | return clk_register(NULL, &osc->hw); | |
94 | } | |
95 | ||
96 | void __init vexpress_osc_of_setup(struct device_node *node) | |
97 | { | |
98 | struct clk_init_data init; | |
99 | struct vexpress_osc *osc; | |
100 | struct clk *clk; | |
101 | u32 range[2]; | |
102 | ||
103 | osc = kzalloc(sizeof(*osc), GFP_KERNEL); | |
104 | if (!osc) | |
c4f3c998 | 105 | return; |
ed27ff1d PM |
106 | |
107 | osc->func = vexpress_config_func_get_by_node(node); | |
108 | if (!osc->func) { | |
109 | pr_err("Failed to obtain config func for node '%s'!\n", | |
110 | node->name); | |
111 | goto error; | |
112 | } | |
113 | ||
114 | if (of_property_read_u32_array(node, "freq-range", range, | |
115 | ARRAY_SIZE(range)) == 0) { | |
116 | osc->rate_min = range[0]; | |
117 | osc->rate_max = range[1]; | |
118 | } | |
119 | ||
120 | of_property_read_string(node, "clock-output-names", &init.name); | |
121 | if (!init.name) | |
122 | init.name = node->name; | |
123 | ||
124 | init.ops = &vexpress_osc_ops; | |
125 | init.flags = CLK_IS_ROOT; | |
126 | init.num_parents = 0; | |
127 | ||
128 | osc->hw.init = &init; | |
129 | ||
130 | clk = clk_register(NULL, &osc->hw); | |
131 | if (IS_ERR(clk)) { | |
132 | pr_err("Failed to register clock '%s'!\n", init.name); | |
133 | goto error; | |
134 | } | |
135 | ||
136 | of_clk_add_provider(node, of_clk_src_simple_get, clk); | |
137 | ||
138 | pr_debug("Registered clock '%s'\n", init.name); | |
139 | ||
140 | return; | |
141 | ||
142 | error: | |
143 | if (osc->func) | |
144 | vexpress_config_func_put(osc->func); | |
145 | kfree(osc); | |
146 | } | |
8ae5ac56 | 147 | CLK_OF_DECLARE(vexpress_soc, "arm,vexpress-osc", vexpress_osc_of_setup); |