avr: struct device - replace bus_id with dev_name(), dev_set_name()
[linux-2.6.git] / arch / avr32 / mach-at32ap / clock.c
1 /*
2  * Clock management for AT32AP CPUs
3  *
4  * Copyright (C) 2006 Atmel Corporation
5  *
6  * Based on arch/arm/mach-at91/clock.c
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 #include <linux/list.h>
19
20 #include <mach/chip.h>
21
22 #include "clock.h"
23
24 /* at32 clock list */
25 static LIST_HEAD(at32_clock_list);
26
27 static DEFINE_SPINLOCK(clk_lock);
28 static DEFINE_SPINLOCK(clk_list_lock);
29
30 void at32_clk_register(struct clk *clk)
31 {
32         spin_lock(&clk_list_lock);
33         /* add the new item to the end of the list */
34         list_add_tail(&clk->list, &at32_clock_list);
35         spin_unlock(&clk_list_lock);
36 }
37
38 struct clk *clk_get(struct device *dev, const char *id)
39 {
40         struct clk *clk;
41
42         spin_lock(&clk_list_lock);
43
44         list_for_each_entry(clk, &at32_clock_list, list) {
45                 if (clk->dev == dev && strcmp(id, clk->name) == 0) {
46                         spin_unlock(&clk_list_lock);
47                         return clk;
48                 }
49         }
50
51         spin_unlock(&clk_list_lock);
52         return ERR_PTR(-ENOENT);
53 }
54 EXPORT_SYMBOL(clk_get);
55
56 void clk_put(struct clk *clk)
57 {
58         /* clocks are static for now, we can't free them */
59 }
60 EXPORT_SYMBOL(clk_put);
61
62 static void __clk_enable(struct clk *clk)
63 {
64         if (clk->parent)
65                 __clk_enable(clk->parent);
66         if (clk->users++ == 0 && clk->mode)
67                 clk->mode(clk, 1);
68 }
69
70 int clk_enable(struct clk *clk)
71 {
72         unsigned long flags;
73
74         spin_lock_irqsave(&clk_lock, flags);
75         __clk_enable(clk);
76         spin_unlock_irqrestore(&clk_lock, flags);
77
78         return 0;
79 }
80 EXPORT_SYMBOL(clk_enable);
81
82 static void __clk_disable(struct clk *clk)
83 {
84         if (clk->users == 0) {
85                 printk(KERN_ERR "%s: mismatched disable\n", clk->name);
86                 WARN_ON(1);
87                 return;
88         }
89
90         if (--clk->users == 0 && clk->mode)
91                 clk->mode(clk, 0);
92         if (clk->parent)
93                 __clk_disable(clk->parent);
94 }
95
96 void clk_disable(struct clk *clk)
97 {
98         unsigned long flags;
99
100         spin_lock_irqsave(&clk_lock, flags);
101         __clk_disable(clk);
102         spin_unlock_irqrestore(&clk_lock, flags);
103 }
104 EXPORT_SYMBOL(clk_disable);
105
106 unsigned long clk_get_rate(struct clk *clk)
107 {
108         unsigned long flags;
109         unsigned long rate;
110
111         spin_lock_irqsave(&clk_lock, flags);
112         rate = clk->get_rate(clk);
113         spin_unlock_irqrestore(&clk_lock, flags);
114
115         return rate;
116 }
117 EXPORT_SYMBOL(clk_get_rate);
118
119 long clk_round_rate(struct clk *clk, unsigned long rate)
120 {
121         unsigned long flags, actual_rate;
122
123         if (!clk->set_rate)
124                 return -ENOSYS;
125
126         spin_lock_irqsave(&clk_lock, flags);
127         actual_rate = clk->set_rate(clk, rate, 0);
128         spin_unlock_irqrestore(&clk_lock, flags);
129
130         return actual_rate;
131 }
132 EXPORT_SYMBOL(clk_round_rate);
133
134 int clk_set_rate(struct clk *clk, unsigned long rate)
135 {
136         unsigned long flags;
137         long ret;
138
139         if (!clk->set_rate)
140                 return -ENOSYS;
141
142         spin_lock_irqsave(&clk_lock, flags);
143         ret = clk->set_rate(clk, rate, 1);
144         spin_unlock_irqrestore(&clk_lock, flags);
145
146         return (ret < 0) ? ret : 0;
147 }
148 EXPORT_SYMBOL(clk_set_rate);
149
150 int clk_set_parent(struct clk *clk, struct clk *parent)
151 {
152         unsigned long flags;
153         int ret;
154
155         if (!clk->set_parent)
156                 return -ENOSYS;
157
158         spin_lock_irqsave(&clk_lock, flags);
159         ret = clk->set_parent(clk, parent);
160         spin_unlock_irqrestore(&clk_lock, flags);
161
162         return ret;
163 }
164 EXPORT_SYMBOL(clk_set_parent);
165
166 struct clk *clk_get_parent(struct clk *clk)
167 {
168         return clk->parent;
169 }
170 EXPORT_SYMBOL(clk_get_parent);
171
172
173
174 #ifdef CONFIG_DEBUG_FS
175
176 /* /sys/kernel/debug/at32ap_clk */
177
178 #include <linux/io.h>
179 #include <linux/debugfs.h>
180 #include <linux/seq_file.h>
181 #include "pm.h"
182
183
184 #define NEST_DELTA      2
185 #define NEST_MAX        6
186
187 struct clkinf {
188         struct seq_file *s;
189         unsigned        nest;
190 };
191
192 static void
193 dump_clock(struct clk *parent, struct clkinf *r)
194 {
195         unsigned        nest = r->nest;
196         char            buf[16 + NEST_MAX];
197         struct clk      *clk;
198         unsigned        i;
199
200         /* skip clocks coupled to devices that aren't registered */
201         if (parent->dev && !dev_name(parent->dev) && !parent->users)
202                 return;
203
204         /* <nest spaces> name <pad to end> */
205         memset(buf, ' ', sizeof(buf) - 1);
206         buf[sizeof(buf) - 1] = 0;
207         i = strlen(parent->name);
208         memcpy(buf + nest, parent->name,
209                         min(i, (unsigned)(sizeof(buf) - 1 - nest)));
210
211         seq_printf(r->s, "%s%c users=%2d %-3s %9ld Hz",
212                 buf, parent->set_parent ? '*' : ' ',
213                 parent->users,
214                 parent->users ? "on" : "off",   /* NOTE: not-paranoid!! */
215                 clk_get_rate(parent));
216         if (parent->dev)
217                 seq_printf(r->s, ", for %s", dev_name(parent->dev));
218         seq_printf(r->s, "\n");
219
220         /* cost of this scan is small, but not linear... */
221         r->nest = nest + NEST_DELTA;
222
223         list_for_each_entry(clk, &at32_clock_list, list) {
224                 if (clk->parent == parent)
225                         dump_clock(clk, r);
226         }
227         r->nest = nest;
228 }
229
230 static int clk_show(struct seq_file *s, void *unused)
231 {
232         struct clkinf   r;
233         int             i;
234         struct clk      *clk;
235
236         /* show all the power manager registers */
237         seq_printf(s, "MCCTRL  = %8x\n", pm_readl(MCCTRL));
238         seq_printf(s, "CKSEL   = %8x\n", pm_readl(CKSEL));
239         seq_printf(s, "CPUMASK = %8x\n", pm_readl(CPU_MASK));
240         seq_printf(s, "HSBMASK = %8x\n", pm_readl(HSB_MASK));
241         seq_printf(s, "PBAMASK = %8x\n", pm_readl(PBA_MASK));
242         seq_printf(s, "PBBMASK = %8x\n", pm_readl(PBB_MASK));
243         seq_printf(s, "PLL0    = %8x\n", pm_readl(PLL0));
244         seq_printf(s, "PLL1    = %8x\n", pm_readl(PLL1));
245         seq_printf(s, "IMR     = %8x\n", pm_readl(IMR));
246         for (i = 0; i < 8; i++) {
247                 if (i == 5)
248                         continue;
249                 seq_printf(s, "GCCTRL%d = %8x\n", i, pm_readl(GCCTRL(i)));
250         }
251
252         seq_printf(s, "\n");
253
254         r.s = s;
255         r.nest = 0;
256         /* protected from changes on the list while dumping */
257         spin_lock(&clk_list_lock);
258
259         /* show clock tree as derived from the three oscillators */
260         clk = clk_get(NULL, "osc32k");
261         dump_clock(clk, &r);
262         clk_put(clk);
263
264         clk = clk_get(NULL, "osc0");
265         dump_clock(clk, &r);
266         clk_put(clk);
267
268         clk = clk_get(NULL, "osc1");
269         dump_clock(clk, &r);
270         clk_put(clk);
271
272         spin_unlock(&clk_list_lock);
273
274         return 0;
275 }
276
277 static int clk_open(struct inode *inode, struct file *file)
278 {
279         return single_open(file, clk_show, NULL);
280 }
281
282 static const struct file_operations clk_operations = {
283         .open           = clk_open,
284         .read           = seq_read,
285         .llseek         = seq_lseek,
286         .release        = single_release,
287 };
288
289 static int __init clk_debugfs_init(void)
290 {
291         (void) debugfs_create_file("at32ap_clk", S_IFREG | S_IRUGO,
292                         NULL, NULL, &clk_operations);
293
294         return 0;
295 }
296 postcore_initcall(clk_debugfs_init);
297
298 #endif