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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> | |
09cf6a29 | 16 | #include <linux/export.h> |
5f97f7f9 HS |
17 | #include <linux/device.h> |
18 | #include <linux/string.h> | |
300bb762 | 19 | #include <linux/list.h> |
5f97f7f9 | 20 | |
a8d902db HS |
21 | #include <mach/chip.h> |
22 | ||
5f97f7f9 HS |
23 | #include "clock.h" |
24 | ||
300bb762 AR |
25 | /* at32 clock list */ |
26 | static LIST_HEAD(at32_clock_list); | |
27 | ||
e89b064a | 28 | static DEFINE_SPINLOCK(clk_lock); |
300bb762 AR |
29 | static DEFINE_SPINLOCK(clk_list_lock); |
30 | ||
31 | void at32_clk_register(struct clk *clk) | |
32 | { | |
33 | spin_lock(&clk_list_lock); | |
34 | /* add the new item to the end of the list */ | |
35 | list_add_tail(&clk->list, &at32_clock_list); | |
36 | spin_unlock(&clk_list_lock); | |
37 | } | |
5f97f7f9 | 38 | |
6e2ad511 | 39 | static struct clk *__clk_get(struct device *dev, const char *id) |
5f97f7f9 | 40 | { |
300bb762 | 41 | struct clk *clk; |
5f97f7f9 | 42 | |
300bb762 AR |
43 | list_for_each_entry(clk, &at32_clock_list, list) { |
44 | if (clk->dev == dev && strcmp(id, clk->name) == 0) { | |
5f97f7f9 | 45 | return clk; |
300bb762 | 46 | } |
5f97f7f9 HS |
47 | } |
48 | ||
49 | return ERR_PTR(-ENOENT); | |
50 | } | |
6e2ad511 OHJ |
51 | |
52 | struct clk *clk_get(struct device *dev, const char *id) | |
53 | { | |
54 | struct clk *clk; | |
55 | ||
56 | spin_lock(&clk_list_lock); | |
57 | clk = __clk_get(dev, id); | |
58 | spin_unlock(&clk_list_lock); | |
59 | ||
60 | return clk; | |
61 | } | |
62 | ||
5f97f7f9 HS |
63 | EXPORT_SYMBOL(clk_get); |
64 | ||
65 | void clk_put(struct clk *clk) | |
66 | { | |
67 | /* clocks are static for now, we can't free them */ | |
68 | } | |
69 | EXPORT_SYMBOL(clk_put); | |
70 | ||
71 | static void __clk_enable(struct clk *clk) | |
72 | { | |
73 | if (clk->parent) | |
74 | __clk_enable(clk->parent); | |
75 | if (clk->users++ == 0 && clk->mode) | |
76 | clk->mode(clk, 1); | |
77 | } | |
78 | ||
79 | int clk_enable(struct clk *clk) | |
80 | { | |
81 | unsigned long flags; | |
82 | ||
5c02a420 AS |
83 | if (!clk) |
84 | return 0; | |
85 | ||
5f97f7f9 HS |
86 | spin_lock_irqsave(&clk_lock, flags); |
87 | __clk_enable(clk); | |
88 | spin_unlock_irqrestore(&clk_lock, flags); | |
89 | ||
90 | return 0; | |
91 | } | |
92 | EXPORT_SYMBOL(clk_enable); | |
93 | ||
94 | static void __clk_disable(struct clk *clk) | |
95 | { | |
23cebe22 HS |
96 | if (clk->users == 0) { |
97 | printk(KERN_ERR "%s: mismatched disable\n", clk->name); | |
98 | WARN_ON(1); | |
99 | return; | |
100 | } | |
5f97f7f9 HS |
101 | |
102 | if (--clk->users == 0 && clk->mode) | |
103 | clk->mode(clk, 0); | |
104 | if (clk->parent) | |
105 | __clk_disable(clk->parent); | |
106 | } | |
107 | ||
108 | void clk_disable(struct clk *clk) | |
109 | { | |
110 | unsigned long flags; | |
111 | ||
5c02a420 AS |
112 | if (IS_ERR_OR_NULL(clk)) |
113 | return; | |
114 | ||
5f97f7f9 HS |
115 | spin_lock_irqsave(&clk_lock, flags); |
116 | __clk_disable(clk); | |
117 | spin_unlock_irqrestore(&clk_lock, flags); | |
118 | } | |
119 | EXPORT_SYMBOL(clk_disable); | |
120 | ||
121 | unsigned long clk_get_rate(struct clk *clk) | |
122 | { | |
123 | unsigned long flags; | |
124 | unsigned long rate; | |
125 | ||
5c02a420 AS |
126 | if (!clk) |
127 | return 0; | |
128 | ||
5f97f7f9 HS |
129 | spin_lock_irqsave(&clk_lock, flags); |
130 | rate = clk->get_rate(clk); | |
131 | spin_unlock_irqrestore(&clk_lock, flags); | |
132 | ||
133 | return rate; | |
134 | } | |
135 | EXPORT_SYMBOL(clk_get_rate); | |
136 | ||
137 | long clk_round_rate(struct clk *clk, unsigned long rate) | |
138 | { | |
139 | unsigned long flags, actual_rate; | |
140 | ||
5c02a420 AS |
141 | if (!clk) |
142 | return 0; | |
143 | ||
5f97f7f9 HS |
144 | if (!clk->set_rate) |
145 | return -ENOSYS; | |
146 | ||
147 | spin_lock_irqsave(&clk_lock, flags); | |
148 | actual_rate = clk->set_rate(clk, rate, 0); | |
149 | spin_unlock_irqrestore(&clk_lock, flags); | |
150 | ||
151 | return actual_rate; | |
152 | } | |
153 | EXPORT_SYMBOL(clk_round_rate); | |
154 | ||
155 | int clk_set_rate(struct clk *clk, unsigned long rate) | |
156 | { | |
157 | unsigned long flags; | |
158 | long ret; | |
159 | ||
5c02a420 AS |
160 | if (!clk) |
161 | return 0; | |
162 | ||
5f97f7f9 HS |
163 | if (!clk->set_rate) |
164 | return -ENOSYS; | |
165 | ||
166 | spin_lock_irqsave(&clk_lock, flags); | |
167 | ret = clk->set_rate(clk, rate, 1); | |
168 | spin_unlock_irqrestore(&clk_lock, flags); | |
169 | ||
170 | return (ret < 0) ? ret : 0; | |
171 | } | |
172 | EXPORT_SYMBOL(clk_set_rate); | |
173 | ||
174 | int clk_set_parent(struct clk *clk, struct clk *parent) | |
175 | { | |
176 | unsigned long flags; | |
177 | int ret; | |
178 | ||
5c02a420 AS |
179 | if (!clk) |
180 | return 0; | |
181 | ||
5f97f7f9 HS |
182 | if (!clk->set_parent) |
183 | return -ENOSYS; | |
184 | ||
185 | spin_lock_irqsave(&clk_lock, flags); | |
186 | ret = clk->set_parent(clk, parent); | |
187 | spin_unlock_irqrestore(&clk_lock, flags); | |
188 | ||
189 | return ret; | |
190 | } | |
191 | EXPORT_SYMBOL(clk_set_parent); | |
192 | ||
193 | struct clk *clk_get_parent(struct clk *clk) | |
194 | { | |
5c02a420 | 195 | return !clk ? NULL : clk->parent; |
5f97f7f9 HS |
196 | } |
197 | EXPORT_SYMBOL(clk_get_parent); | |
d938b893 DB |
198 | |
199 | ||
200 | ||
201 | #ifdef CONFIG_DEBUG_FS | |
202 | ||
203 | /* /sys/kernel/debug/at32ap_clk */ | |
204 | ||
205 | #include <linux/io.h> | |
206 | #include <linux/debugfs.h> | |
207 | #include <linux/seq_file.h> | |
208 | #include "pm.h" | |
209 | ||
210 | ||
211 | #define NEST_DELTA 2 | |
212 | #define NEST_MAX 6 | |
213 | ||
214 | struct clkinf { | |
215 | struct seq_file *s; | |
216 | unsigned nest; | |
217 | }; | |
218 | ||
219 | static void | |
220 | dump_clock(struct clk *parent, struct clkinf *r) | |
221 | { | |
222 | unsigned nest = r->nest; | |
223 | char buf[16 + NEST_MAX]; | |
224 | struct clk *clk; | |
225 | unsigned i; | |
226 | ||
227 | /* skip clocks coupled to devices that aren't registered */ | |
169539c8 | 228 | if (parent->dev && !dev_name(parent->dev) && !parent->users) |
d938b893 DB |
229 | return; |
230 | ||
231 | /* <nest spaces> name <pad to end> */ | |
232 | memset(buf, ' ', sizeof(buf) - 1); | |
233 | buf[sizeof(buf) - 1] = 0; | |
234 | i = strlen(parent->name); | |
235 | memcpy(buf + nest, parent->name, | |
236 | min(i, (unsigned)(sizeof(buf) - 1 - nest))); | |
237 | ||
238 | seq_printf(r->s, "%s%c users=%2d %-3s %9ld Hz", | |
239 | buf, parent->set_parent ? '*' : ' ', | |
240 | parent->users, | |
241 | parent->users ? "on" : "off", /* NOTE: not-paranoid!! */ | |
242 | clk_get_rate(parent)); | |
243 | if (parent->dev) | |
169539c8 | 244 | seq_printf(r->s, ", for %s", dev_name(parent->dev)); |
d938b893 DB |
245 | seq_printf(r->s, "\n"); |
246 | ||
247 | /* cost of this scan is small, but not linear... */ | |
248 | r->nest = nest + NEST_DELTA; | |
300bb762 AR |
249 | |
250 | list_for_each_entry(clk, &at32_clock_list, list) { | |
d938b893 DB |
251 | if (clk->parent == parent) |
252 | dump_clock(clk, r); | |
253 | } | |
254 | r->nest = nest; | |
255 | } | |
256 | ||
257 | static int clk_show(struct seq_file *s, void *unused) | |
258 | { | |
259 | struct clkinf r; | |
260 | int i; | |
300bb762 | 261 | struct clk *clk; |
d938b893 DB |
262 | |
263 | /* show all the power manager registers */ | |
264 | seq_printf(s, "MCCTRL = %8x\n", pm_readl(MCCTRL)); | |
265 | seq_printf(s, "CKSEL = %8x\n", pm_readl(CKSEL)); | |
266 | seq_printf(s, "CPUMASK = %8x\n", pm_readl(CPU_MASK)); | |
267 | seq_printf(s, "HSBMASK = %8x\n", pm_readl(HSB_MASK)); | |
268 | seq_printf(s, "PBAMASK = %8x\n", pm_readl(PBA_MASK)); | |
269 | seq_printf(s, "PBBMASK = %8x\n", pm_readl(PBB_MASK)); | |
270 | seq_printf(s, "PLL0 = %8x\n", pm_readl(PLL0)); | |
271 | seq_printf(s, "PLL1 = %8x\n", pm_readl(PLL1)); | |
272 | seq_printf(s, "IMR = %8x\n", pm_readl(IMR)); | |
273 | for (i = 0; i < 8; i++) { | |
274 | if (i == 5) | |
275 | continue; | |
276 | seq_printf(s, "GCCTRL%d = %8x\n", i, pm_readl(GCCTRL(i))); | |
277 | } | |
278 | ||
279 | seq_printf(s, "\n"); | |
280 | ||
d938b893 DB |
281 | r.s = s; |
282 | r.nest = 0; | |
300bb762 AR |
283 | /* protected from changes on the list while dumping */ |
284 | spin_lock(&clk_list_lock); | |
285 | ||
286 | /* show clock tree as derived from the three oscillators */ | |
6e2ad511 | 287 | clk = __clk_get(NULL, "osc32k"); |
300bb762 AR |
288 | dump_clock(clk, &r); |
289 | clk_put(clk); | |
290 | ||
6e2ad511 | 291 | clk = __clk_get(NULL, "osc0"); |
300bb762 AR |
292 | dump_clock(clk, &r); |
293 | clk_put(clk); | |
294 | ||
6e2ad511 | 295 | clk = __clk_get(NULL, "osc1"); |
300bb762 AR |
296 | dump_clock(clk, &r); |
297 | clk_put(clk); | |
298 | ||
299 | spin_unlock(&clk_list_lock); | |
d938b893 DB |
300 | |
301 | return 0; | |
302 | } | |
303 | ||
304 | static int clk_open(struct inode *inode, struct file *file) | |
305 | { | |
306 | return single_open(file, clk_show, NULL); | |
307 | } | |
308 | ||
309 | static const struct file_operations clk_operations = { | |
310 | .open = clk_open, | |
311 | .read = seq_read, | |
312 | .llseek = seq_lseek, | |
313 | .release = single_release, | |
314 | }; | |
315 | ||
316 | static int __init clk_debugfs_init(void) | |
317 | { | |
318 | (void) debugfs_create_file("at32ap_clk", S_IFREG | S_IRUGO, | |
319 | NULL, NULL, &clk_operations); | |
320 | ||
321 | return 0; | |
322 | } | |
323 | postcore_initcall(clk_debugfs_init); | |
324 | ||
325 | #endif |