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/version.h>
18 #include <linux/kernel.h>
19 #include <linux/init.h>
20 #include <linux/module.h>
21 #include <linux/list.h>
22 #include <linux/err.h>
23 #include <linux/clk.h>
24 #include <linux/spinlock.h>
25 #include <linux/debugfs.h>
26 #include <linux/ctype.h>
27 #include <linux/pm_qos_params.h>
31 #include "proc_comm.h"
32 #include "clock-7x30.h"
34 static DEFINE_MUTEX(clocks_mutex);
35 static DEFINE_SPINLOCK(clocks_lock);
36 static LIST_HEAD(clocks);
37 struct clk *msm_clocks;
38 unsigned msm_num_clocks;
41 * Bitmap of enabled clocks, excluding ACPU which is always
44 static DECLARE_BITMAP(clock_map_enabled, NR_CLKS);
45 static DEFINE_SPINLOCK(clock_map_lock);
48 * Standard clock functions defined in include/linux/clk.h
50 struct clk *clk_get(struct device *dev, const char *id)
54 mutex_lock(&clocks_mutex);
56 list_for_each_entry(clk, &clocks, list)
57 if (!strcmp(id, clk->name) && clk->dev == dev)
60 list_for_each_entry(clk, &clocks, list)
61 if (!strcmp(id, clk->name) && clk->dev == NULL)
64 clk = ERR_PTR(-ENOENT);
66 mutex_unlock(&clocks_mutex);
69 EXPORT_SYMBOL(clk_get);
71 void clk_put(struct clk *clk)
74 EXPORT_SYMBOL(clk_put);
76 int clk_enable(struct clk *clk)
79 spin_lock_irqsave(&clocks_lock, flags);
81 if (clk->count == 1) {
82 clk->ops->enable(clk->id);
83 spin_lock(&clock_map_lock);
84 clock_map_enabled[BIT_WORD(clk->id)] |= BIT_MASK(clk->id);
85 spin_unlock(&clock_map_lock);
87 spin_unlock_irqrestore(&clocks_lock, flags);
90 EXPORT_SYMBOL(clk_enable);
92 void clk_disable(struct clk *clk)
95 spin_lock_irqsave(&clocks_lock, flags);
96 BUG_ON(clk->count == 0);
98 if (clk->count == 0) {
99 clk->ops->disable(clk->id);
100 spin_lock(&clock_map_lock);
101 clock_map_enabled[BIT_WORD(clk->id)] &= ~BIT_MASK(clk->id);
102 spin_unlock(&clock_map_lock);
104 spin_unlock_irqrestore(&clocks_lock, flags);
106 EXPORT_SYMBOL(clk_disable);
108 int clk_reset(struct clk *clk, enum clk_reset_action action)
110 if (!clk->ops->reset)
111 clk->ops->reset = &pc_clk_reset;
112 return clk->ops->reset(clk->remote_id, action);
114 EXPORT_SYMBOL(clk_reset);
116 unsigned long clk_get_rate(struct clk *clk)
118 return clk->ops->get_rate(clk->id);
120 EXPORT_SYMBOL(clk_get_rate);
122 int clk_set_rate(struct clk *clk, unsigned long rate)
124 return clk->ops->set_rate(clk->id, rate);
126 EXPORT_SYMBOL(clk_set_rate);
128 long clk_round_rate(struct clk *clk, unsigned long rate)
130 return clk->ops->round_rate(clk->id, rate);
132 EXPORT_SYMBOL(clk_round_rate);
134 int clk_set_min_rate(struct clk *clk, unsigned long rate)
136 return clk->ops->set_min_rate(clk->id, rate);
138 EXPORT_SYMBOL(clk_set_min_rate);
140 int clk_set_max_rate(struct clk *clk, unsigned long rate)
142 return clk->ops->set_max_rate(clk->id, rate);
144 EXPORT_SYMBOL(clk_set_max_rate);
146 int clk_set_parent(struct clk *clk, struct clk *parent)
150 EXPORT_SYMBOL(clk_set_parent);
152 struct clk *clk_get_parent(struct clk *clk)
154 return ERR_PTR(-ENOSYS);
156 EXPORT_SYMBOL(clk_get_parent);
158 int clk_set_flags(struct clk *clk, unsigned long flags)
160 if (clk == NULL || IS_ERR(clk))
162 return clk->ops->set_flags(clk->id, flags);
164 EXPORT_SYMBOL(clk_set_flags);
166 /* EBI1 is the only shared clock that several clients want to vote on as of
167 * this commit. If this changes in the future, then it might be better to
168 * make clk_min_rate handle the voting or make ebi1_clk_set_min_rate more
169 * generic to support different clocks.
171 static struct clk *ebi1_clk;
173 static void __init set_clock_ops(struct clk *clk)
176 clk->ops = &clk_ops_pcom;
177 clk->id = clk->remote_id;
181 void __init msm_clock_init(struct clk *clock_tbl, unsigned num_clocks)
185 spin_lock_init(&clocks_lock);
186 mutex_lock(&clocks_mutex);
187 msm_clocks = clock_tbl;
188 msm_num_clocks = num_clocks;
189 for (n = 0; n < msm_num_clocks; n++) {
190 set_clock_ops(&msm_clocks[n]);
191 list_add_tail(&msm_clocks[n].list, &clocks);
193 mutex_unlock(&clocks_mutex);
195 ebi1_clk = clk_get(NULL, "ebi1_clk");
196 BUG_ON(ebi1_clk == NULL);
200 #if defined(CONFIG_DEBUG_FS)
201 static struct clk *msm_clock_get_nth(unsigned index)
203 if (index < msm_num_clocks)
204 return msm_clocks + index;
209 static int clock_debug_rate_set(void *data, u64 val)
211 struct clk *clock = data;
214 /* Only increases to max rate will succeed, but that's actually good
215 * for debugging purposes. So we don't check for error. */
216 if (clock->flags & CLK_MAX)
217 clk_set_max_rate(clock, val);
218 if (clock->flags & CLK_MIN)
219 ret = clk_set_min_rate(clock, val);
221 ret = clk_set_rate(clock, val);
223 printk(KERN_ERR "clk_set%s_rate failed (%d)\n",
224 (clock->flags & CLK_MIN) ? "_min" : "", ret);
228 static int clock_debug_rate_get(void *data, u64 *val)
230 struct clk *clock = data;
231 *val = clk_get_rate(clock);
235 static int clock_debug_enable_set(void *data, u64 val)
237 struct clk *clock = data;
241 rc = clock->ops->enable(clock->id);
243 clock->ops->disable(clock->id);
248 static int clock_debug_enable_get(void *data, u64 *val)
250 struct clk *clock = data;
252 *val = clock->ops->is_enabled(clock->id);
257 static int clock_debug_local_get(void *data, u64 *val)
259 struct clk *clock = data;
261 *val = clock->ops != &clk_ops_pcom;
266 DEFINE_SIMPLE_ATTRIBUTE(clock_rate_fops, clock_debug_rate_get,
267 clock_debug_rate_set, "%llu\n");
268 DEFINE_SIMPLE_ATTRIBUTE(clock_enable_fops, clock_debug_enable_get,
269 clock_debug_enable_set, "%llu\n");
270 DEFINE_SIMPLE_ATTRIBUTE(clock_local_fops, clock_debug_local_get,
273 static int __init clock_debug_init(void)
275 struct dentry *dent_rate, *dent_enable, *dent_local;
280 dent_rate = debugfs_create_dir("clk_rate", 0);
281 if (IS_ERR(dent_rate))
282 return PTR_ERR(dent_rate);
284 dent_enable = debugfs_create_dir("clk_enable", 0);
285 if (IS_ERR(dent_enable))
286 return PTR_ERR(dent_enable);
288 dent_local = debugfs_create_dir("clk_local", NULL);
289 if (IS_ERR(dent_local))
290 return PTR_ERR(dent_local);
292 while ((clock = msm_clock_get_nth(n++)) != 0) {
293 strncpy(temp, clock->dbg_name, ARRAY_SIZE(temp)-1);
294 for (ptr = temp; *ptr; ptr++)
295 *ptr = tolower(*ptr);
296 debugfs_create_file(temp, 0644, dent_rate,
297 clock, &clock_rate_fops);
298 debugfs_create_file(temp, 0644, dent_enable,
299 clock, &clock_enable_fops);
300 debugfs_create_file(temp, S_IRUGO, dent_local,
301 clock, &clock_local_fops);
306 device_initcall(clock_debug_init);
309 /* The bootloader and/or AMSS may have left various clocks enabled.
310 * Disable any clocks that belong to us (CLKFLAG_AUTO_OFF) but have
311 * not been explicitly enabled by a clk_enable() call.
313 static int __init clock_late_init(void)
319 mutex_lock(&clocks_mutex);
320 list_for_each_entry(clk, &clocks, list) {
321 if (clk->flags & CLKFLAG_AUTO_OFF) {
322 spin_lock_irqsave(&clocks_lock, flags);
325 clk->ops->auto_off(clk->id);
327 spin_unlock_irqrestore(&clocks_lock, flags);
330 mutex_unlock(&clocks_mutex);
331 pr_info("clock_late_init() disabled %d unused clocks\n", count);
335 late_initcall(clock_late_init);