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5f97f7f9 HS |
1 | /* |
2 | * Clock management for AT32AP CPUs | |
3 | * | |
4 | * Copyright (C) 2006 Atmel Corporation | |
5 | * | |
9d041268 | 6 | * Based on arch/arm/mach-at91/clock.c |
5f97f7f9 HS |
7 | * Copyright (C) 2005 David Brownell |
8 | * Copyright (C) 2005 Ivan Kokshaysky | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License version 2 as | |
12 | * published by the Free Software Foundation. | |
13 | */ | |
14 | #include <linux/clk.h> | |
15 | #include <linux/err.h> | |
16 | #include <linux/device.h> | |
17 | #include <linux/string.h> | |
18 | ||
19 | #include "clock.h" | |
20 | ||
e89b064a | 21 | static DEFINE_SPINLOCK(clk_lock); |
5f97f7f9 HS |
22 | |
23 | struct clk *clk_get(struct device *dev, const char *id) | |
24 | { | |
25 | int i; | |
26 | ||
27 | for (i = 0; i < at32_nr_clocks; i++) { | |
28 | struct clk *clk = at32_clock_list[i]; | |
29 | ||
30 | if (clk->dev == dev && strcmp(id, clk->name) == 0) | |
31 | return clk; | |
32 | } | |
33 | ||
34 | return ERR_PTR(-ENOENT); | |
35 | } | |
36 | EXPORT_SYMBOL(clk_get); | |
37 | ||
38 | void clk_put(struct clk *clk) | |
39 | { | |
40 | /* clocks are static for now, we can't free them */ | |
41 | } | |
42 | EXPORT_SYMBOL(clk_put); | |
43 | ||
44 | static void __clk_enable(struct clk *clk) | |
45 | { | |
46 | if (clk->parent) | |
47 | __clk_enable(clk->parent); | |
48 | if (clk->users++ == 0 && clk->mode) | |
49 | clk->mode(clk, 1); | |
50 | } | |
51 | ||
52 | int clk_enable(struct clk *clk) | |
53 | { | |
54 | unsigned long flags; | |
55 | ||
56 | spin_lock_irqsave(&clk_lock, flags); | |
57 | __clk_enable(clk); | |
58 | spin_unlock_irqrestore(&clk_lock, flags); | |
59 | ||
60 | return 0; | |
61 | } | |
62 | EXPORT_SYMBOL(clk_enable); | |
63 | ||
64 | static void __clk_disable(struct clk *clk) | |
65 | { | |
23cebe22 HS |
66 | if (clk->users == 0) { |
67 | printk(KERN_ERR "%s: mismatched disable\n", clk->name); | |
68 | WARN_ON(1); | |
69 | return; | |
70 | } | |
5f97f7f9 HS |
71 | |
72 | if (--clk->users == 0 && clk->mode) | |
73 | clk->mode(clk, 0); | |
74 | if (clk->parent) | |
75 | __clk_disable(clk->parent); | |
76 | } | |
77 | ||
78 | void clk_disable(struct clk *clk) | |
79 | { | |
80 | unsigned long flags; | |
81 | ||
82 | spin_lock_irqsave(&clk_lock, flags); | |
83 | __clk_disable(clk); | |
84 | spin_unlock_irqrestore(&clk_lock, flags); | |
85 | } | |
86 | EXPORT_SYMBOL(clk_disable); | |
87 | ||
88 | unsigned long clk_get_rate(struct clk *clk) | |
89 | { | |
90 | unsigned long flags; | |
91 | unsigned long rate; | |
92 | ||
93 | spin_lock_irqsave(&clk_lock, flags); | |
94 | rate = clk->get_rate(clk); | |
95 | spin_unlock_irqrestore(&clk_lock, flags); | |
96 | ||
97 | return rate; | |
98 | } | |
99 | EXPORT_SYMBOL(clk_get_rate); | |
100 | ||
101 | long clk_round_rate(struct clk *clk, unsigned long rate) | |
102 | { | |
103 | unsigned long flags, actual_rate; | |
104 | ||
105 | if (!clk->set_rate) | |
106 | return -ENOSYS; | |
107 | ||
108 | spin_lock_irqsave(&clk_lock, flags); | |
109 | actual_rate = clk->set_rate(clk, rate, 0); | |
110 | spin_unlock_irqrestore(&clk_lock, flags); | |
111 | ||
112 | return actual_rate; | |
113 | } | |
114 | EXPORT_SYMBOL(clk_round_rate); | |
115 | ||
116 | int clk_set_rate(struct clk *clk, unsigned long rate) | |
117 | { | |
118 | unsigned long flags; | |
119 | long ret; | |
120 | ||
121 | if (!clk->set_rate) | |
122 | return -ENOSYS; | |
123 | ||
124 | spin_lock_irqsave(&clk_lock, flags); | |
125 | ret = clk->set_rate(clk, rate, 1); | |
126 | spin_unlock_irqrestore(&clk_lock, flags); | |
127 | ||
128 | return (ret < 0) ? ret : 0; | |
129 | } | |
130 | EXPORT_SYMBOL(clk_set_rate); | |
131 | ||
132 | int clk_set_parent(struct clk *clk, struct clk *parent) | |
133 | { | |
134 | unsigned long flags; | |
135 | int ret; | |
136 | ||
137 | if (!clk->set_parent) | |
138 | return -ENOSYS; | |
139 | ||
140 | spin_lock_irqsave(&clk_lock, flags); | |
141 | ret = clk->set_parent(clk, parent); | |
142 | spin_unlock_irqrestore(&clk_lock, flags); | |
143 | ||
144 | return ret; | |
145 | } | |
146 | EXPORT_SYMBOL(clk_set_parent); | |
147 | ||
148 | struct clk *clk_get_parent(struct clk *clk) | |
149 | { | |
150 | return clk->parent; | |
151 | } | |
152 | EXPORT_SYMBOL(clk_get_parent); | |
d938b893 DB |
153 | |
154 | ||
155 | ||
156 | #ifdef CONFIG_DEBUG_FS | |
157 | ||
158 | /* /sys/kernel/debug/at32ap_clk */ | |
159 | ||
160 | #include <linux/io.h> | |
161 | #include <linux/debugfs.h> | |
162 | #include <linux/seq_file.h> | |
163 | #include "pm.h" | |
164 | ||
165 | ||
166 | #define NEST_DELTA 2 | |
167 | #define NEST_MAX 6 | |
168 | ||
169 | struct clkinf { | |
170 | struct seq_file *s; | |
171 | unsigned nest; | |
172 | }; | |
173 | ||
174 | static void | |
175 | dump_clock(struct clk *parent, struct clkinf *r) | |
176 | { | |
177 | unsigned nest = r->nest; | |
178 | char buf[16 + NEST_MAX]; | |
179 | struct clk *clk; | |
180 | unsigned i; | |
181 | ||
182 | /* skip clocks coupled to devices that aren't registered */ | |
183 | if (parent->dev && !parent->dev->bus_id[0] && !parent->users) | |
184 | return; | |
185 | ||
186 | /* <nest spaces> name <pad to end> */ | |
187 | memset(buf, ' ', sizeof(buf) - 1); | |
188 | buf[sizeof(buf) - 1] = 0; | |
189 | i = strlen(parent->name); | |
190 | memcpy(buf + nest, parent->name, | |
191 | min(i, (unsigned)(sizeof(buf) - 1 - nest))); | |
192 | ||
193 | seq_printf(r->s, "%s%c users=%2d %-3s %9ld Hz", | |
194 | buf, parent->set_parent ? '*' : ' ', | |
195 | parent->users, | |
196 | parent->users ? "on" : "off", /* NOTE: not-paranoid!! */ | |
197 | clk_get_rate(parent)); | |
198 | if (parent->dev) | |
199 | seq_printf(r->s, ", for %s", parent->dev->bus_id); | |
200 | seq_printf(r->s, "\n"); | |
201 | ||
202 | /* cost of this scan is small, but not linear... */ | |
203 | r->nest = nest + NEST_DELTA; | |
204 | for (i = 3; i < at32_nr_clocks; i++) { | |
205 | clk = at32_clock_list[i]; | |
206 | if (clk->parent == parent) | |
207 | dump_clock(clk, r); | |
208 | } | |
209 | r->nest = nest; | |
210 | } | |
211 | ||
212 | static int clk_show(struct seq_file *s, void *unused) | |
213 | { | |
214 | struct clkinf r; | |
215 | int i; | |
216 | ||
217 | /* show all the power manager registers */ | |
218 | seq_printf(s, "MCCTRL = %8x\n", pm_readl(MCCTRL)); | |
219 | seq_printf(s, "CKSEL = %8x\n", pm_readl(CKSEL)); | |
220 | seq_printf(s, "CPUMASK = %8x\n", pm_readl(CPU_MASK)); | |
221 | seq_printf(s, "HSBMASK = %8x\n", pm_readl(HSB_MASK)); | |
222 | seq_printf(s, "PBAMASK = %8x\n", pm_readl(PBA_MASK)); | |
223 | seq_printf(s, "PBBMASK = %8x\n", pm_readl(PBB_MASK)); | |
224 | seq_printf(s, "PLL0 = %8x\n", pm_readl(PLL0)); | |
225 | seq_printf(s, "PLL1 = %8x\n", pm_readl(PLL1)); | |
226 | seq_printf(s, "IMR = %8x\n", pm_readl(IMR)); | |
227 | for (i = 0; i < 8; i++) { | |
228 | if (i == 5) | |
229 | continue; | |
230 | seq_printf(s, "GCCTRL%d = %8x\n", i, pm_readl(GCCTRL(i))); | |
231 | } | |
232 | ||
233 | seq_printf(s, "\n"); | |
234 | ||
235 | /* show clock tree as derived from the three oscillators | |
236 | * we "know" are at the head of the list | |
237 | */ | |
238 | r.s = s; | |
239 | r.nest = 0; | |
240 | dump_clock(at32_clock_list[0], &r); | |
241 | dump_clock(at32_clock_list[1], &r); | |
242 | dump_clock(at32_clock_list[2], &r); | |
243 | ||
244 | return 0; | |
245 | } | |
246 | ||
247 | static int clk_open(struct inode *inode, struct file *file) | |
248 | { | |
249 | return single_open(file, clk_show, NULL); | |
250 | } | |
251 | ||
252 | static const struct file_operations clk_operations = { | |
253 | .open = clk_open, | |
254 | .read = seq_read, | |
255 | .llseek = seq_lseek, | |
256 | .release = single_release, | |
257 | }; | |
258 | ||
259 | static int __init clk_debugfs_init(void) | |
260 | { | |
261 | (void) debugfs_create_file("at32ap_clk", S_IFREG | S_IRUGO, | |
262 | NULL, NULL, &clk_operations); | |
263 | ||
264 | return 0; | |
265 | } | |
266 | postcore_initcall(clk_debugfs_init); | |
267 | ||
268 | #endif |