1 /* arch/arm/mach-msm/clock.c
3 * Copyright (C) 2007 Google, Inc.
4 * Copyright (c) 2007-2010, Code Aurora Forum. All rights reserved.
6 * This software is licensed under the terms of the GNU General Public
7 * License version 2, as published by the Free Software Foundation, and
8 * may be copied, distributed, and modified under those terms.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
17 #include <linux/kernel.h>
18 #include <linux/init.h>
19 #include <linux/module.h>
20 #include <linux/list.h>
21 #include <linux/err.h>
22 #include <linux/clk.h>
23 #include <linux/spinlock.h>
24 #include <linux/debugfs.h>
25 #include <linux/ctype.h>
26 #include <linux/pm_qos_params.h>
30 #include "proc_comm.h"
31 #include "clock-7x30.h"
33 static DEFINE_MUTEX(clocks_mutex);
34 static DEFINE_SPINLOCK(clocks_lock);
35 static LIST_HEAD(clocks);
36 struct clk *msm_clocks;
37 unsigned msm_num_clocks;
40 * Bitmap of enabled clocks, excluding ACPU which is always
43 static DECLARE_BITMAP(clock_map_enabled, NR_CLKS);
44 static DEFINE_SPINLOCK(clock_map_lock);
47 * Standard clock functions defined in include/linux/clk.h
49 struct clk *clk_get(struct device *dev, const char *id)
53 mutex_lock(&clocks_mutex);
55 list_for_each_entry(clk, &clocks, list)
56 if (!strcmp(id, clk->name) && clk->dev == dev)
59 list_for_each_entry(clk, &clocks, list)
60 if (!strcmp(id, clk->name) && clk->dev == NULL)
63 clk = ERR_PTR(-ENOENT);
65 mutex_unlock(&clocks_mutex);
68 EXPORT_SYMBOL(clk_get);
70 void clk_put(struct clk *clk)
73 EXPORT_SYMBOL(clk_put);
75 int clk_enable(struct clk *clk)
78 spin_lock_irqsave(&clocks_lock, flags);
80 if (clk->count == 1) {
81 clk->ops->enable(clk->id);
82 spin_lock(&clock_map_lock);
83 clock_map_enabled[BIT_WORD(clk->id)] |= BIT_MASK(clk->id);
84 spin_unlock(&clock_map_lock);
86 spin_unlock_irqrestore(&clocks_lock, flags);
89 EXPORT_SYMBOL(clk_enable);
91 void clk_disable(struct clk *clk)
94 spin_lock_irqsave(&clocks_lock, flags);
95 BUG_ON(clk->count == 0);
97 if (clk->count == 0) {
98 clk->ops->disable(clk->id);
99 spin_lock(&clock_map_lock);
100 clock_map_enabled[BIT_WORD(clk->id)] &= ~BIT_MASK(clk->id);
101 spin_unlock(&clock_map_lock);
103 spin_unlock_irqrestore(&clocks_lock, flags);
105 EXPORT_SYMBOL(clk_disable);
107 int clk_reset(struct clk *clk, enum clk_reset_action action)
109 if (!clk->ops->reset)
110 clk->ops->reset = &pc_clk_reset;
111 return clk->ops->reset(clk->remote_id, action);
113 EXPORT_SYMBOL(clk_reset);
115 unsigned long clk_get_rate(struct clk *clk)
117 return clk->ops->get_rate(clk->id);
119 EXPORT_SYMBOL(clk_get_rate);
121 int clk_set_rate(struct clk *clk, unsigned long rate)
124 if (clk->flags & CLKFLAG_MAX) {
125 ret = clk->ops->set_max_rate(clk->id, rate);
129 if (clk->flags & CLKFLAG_MIN) {
130 ret = clk->ops->set_min_rate(clk->id, rate);
135 if (clk->flags & CLKFLAG_MAX || clk->flags & CLKFLAG_MIN)
138 return clk->ops->set_rate(clk->id, rate);
140 EXPORT_SYMBOL(clk_set_rate);
142 long clk_round_rate(struct clk *clk, unsigned long rate)
144 return clk->ops->round_rate(clk->id, rate);
146 EXPORT_SYMBOL(clk_round_rate);
148 int clk_set_min_rate(struct clk *clk, unsigned long rate)
150 return clk->ops->set_min_rate(clk->id, rate);
152 EXPORT_SYMBOL(clk_set_min_rate);
154 int clk_set_max_rate(struct clk *clk, unsigned long rate)
156 return clk->ops->set_max_rate(clk->id, rate);
158 EXPORT_SYMBOL(clk_set_max_rate);
160 int clk_set_parent(struct clk *clk, struct clk *parent)
164 EXPORT_SYMBOL(clk_set_parent);
166 struct clk *clk_get_parent(struct clk *clk)
168 return ERR_PTR(-ENOSYS);
170 EXPORT_SYMBOL(clk_get_parent);
172 int clk_set_flags(struct clk *clk, unsigned long flags)
174 if (clk == NULL || IS_ERR(clk))
176 return clk->ops->set_flags(clk->id, flags);
178 EXPORT_SYMBOL(clk_set_flags);
180 /* EBI1 is the only shared clock that several clients want to vote on as of
181 * this commit. If this changes in the future, then it might be better to
182 * make clk_min_rate handle the voting or make ebi1_clk_set_min_rate more
183 * generic to support different clocks.
185 static struct clk *ebi1_clk;
187 static void __init set_clock_ops(struct clk *clk)
190 clk->ops = &clk_ops_pcom;
191 clk->id = clk->remote_id;
195 void __init msm_clock_init(struct clk *clock_tbl, unsigned num_clocks)
199 spin_lock_init(&clocks_lock);
200 mutex_lock(&clocks_mutex);
201 msm_clocks = clock_tbl;
202 msm_num_clocks = num_clocks;
203 for (n = 0; n < msm_num_clocks; n++) {
204 set_clock_ops(&msm_clocks[n]);
205 list_add_tail(&msm_clocks[n].list, &clocks);
207 mutex_unlock(&clocks_mutex);
209 ebi1_clk = clk_get(NULL, "ebi1_clk");
210 BUG_ON(ebi1_clk == NULL);
214 #if defined(CONFIG_DEBUG_FS)
215 static struct clk *msm_clock_get_nth(unsigned index)
217 if (index < msm_num_clocks)
218 return msm_clocks + index;
223 static int clock_debug_rate_set(void *data, u64 val)
225 struct clk *clock = data;
228 /* Only increases to max rate will succeed, but that's actually good
229 * for debugging purposes. So we don't check for error. */
230 if (clock->flags & CLK_MAX)
231 clk_set_max_rate(clock, val);
232 if (clock->flags & CLK_MIN)
233 ret = clk_set_min_rate(clock, val);
235 ret = clk_set_rate(clock, val);
237 printk(KERN_ERR "clk_set%s_rate failed (%d)\n",
238 (clock->flags & CLK_MIN) ? "_min" : "", ret);
242 static int clock_debug_rate_get(void *data, u64 *val)
244 struct clk *clock = data;
245 *val = clk_get_rate(clock);
249 static int clock_debug_enable_set(void *data, u64 val)
251 struct clk *clock = data;
255 rc = clock->ops->enable(clock->id);
257 clock->ops->disable(clock->id);
262 static int clock_debug_enable_get(void *data, u64 *val)
264 struct clk *clock = data;
266 *val = clock->ops->is_enabled(clock->id);
271 static int clock_debug_local_get(void *data, u64 *val)
273 struct clk *clock = data;
275 *val = clock->ops != &clk_ops_pcom;
280 DEFINE_SIMPLE_ATTRIBUTE(clock_rate_fops, clock_debug_rate_get,
281 clock_debug_rate_set, "%llu\n");
282 DEFINE_SIMPLE_ATTRIBUTE(clock_enable_fops, clock_debug_enable_get,
283 clock_debug_enable_set, "%llu\n");
284 DEFINE_SIMPLE_ATTRIBUTE(clock_local_fops, clock_debug_local_get,
287 static int __init clock_debug_init(void)
289 struct dentry *dent_rate, *dent_enable, *dent_local;
294 dent_rate = debugfs_create_dir("clk_rate", 0);
295 if (IS_ERR(dent_rate))
296 return PTR_ERR(dent_rate);
298 dent_enable = debugfs_create_dir("clk_enable", 0);
299 if (IS_ERR(dent_enable))
300 return PTR_ERR(dent_enable);
302 dent_local = debugfs_create_dir("clk_local", NULL);
303 if (IS_ERR(dent_local))
304 return PTR_ERR(dent_local);
306 while ((clock = msm_clock_get_nth(n++)) != 0) {
307 strncpy(temp, clock->dbg_name, ARRAY_SIZE(temp)-1);
308 for (ptr = temp; *ptr; ptr++)
309 *ptr = tolower(*ptr);
310 debugfs_create_file(temp, 0644, dent_rate,
311 clock, &clock_rate_fops);
312 debugfs_create_file(temp, 0644, dent_enable,
313 clock, &clock_enable_fops);
314 debugfs_create_file(temp, S_IRUGO, dent_local,
315 clock, &clock_local_fops);
320 device_initcall(clock_debug_init);
323 /* The bootloader and/or AMSS may have left various clocks enabled.
324 * Disable any clocks that belong to us (CLKFLAG_AUTO_OFF) but have
325 * not been explicitly enabled by a clk_enable() call.
327 static int __init clock_late_init(void)
333 mutex_lock(&clocks_mutex);
334 list_for_each_entry(clk, &clocks, list) {
335 if (clk->flags & CLKFLAG_AUTO_OFF) {
336 spin_lock_irqsave(&clocks_lock, flags);
339 clk->ops->auto_off(clk->id);
341 spin_unlock_irqrestore(&clocks_lock, flags);
344 mutex_unlock(&clocks_mutex);
345 pr_info("clock_late_init() disabled %d unused clocks\n", count);
349 late_initcall(clock_late_init);