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Linux/arch/arm/mach-msm/clock.c

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  1 /* arch/arm/mach-msm/clock.c
  2  *
  3  * Copyright (C) 2007 Google, Inc.
  4  * Copyright (c) 2007-2010, Code Aurora Forum. All rights reserved.
  5  *
  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.
  9  *
 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.
 14  *
 15  */
 16 
 17 #include <linux/kernel.h>
 18 #include <linux/list.h>
 19 #include <linux/err.h>
 20 #include <linux/spinlock.h>
 21 #include <linux/pm_qos_params.h>
 22 #include <linux/mutex.h>
 23 #include <linux/clk.h>
 24 #include <linux/string.h>
 25 #include <linux/module.h>
 26 #include <linux/clkdev.h>
 27 
 28 #include "clock.h"
 29 
 30 static DEFINE_MUTEX(clocks_mutex);
 31 static DEFINE_SPINLOCK(clocks_lock);
 32 static LIST_HEAD(clocks);
 33 
 34 /*
 35  * Standard clock functions defined in include/linux/clk.h
 36  */
 37 int clk_enable(struct clk *clk)
 38 {
 39         unsigned long flags;
 40         spin_lock_irqsave(&clocks_lock, flags);
 41         clk->count++;
 42         if (clk->count == 1)
 43                 clk->ops->enable(clk->id);
 44         spin_unlock_irqrestore(&clocks_lock, flags);
 45         return 0;
 46 }
 47 EXPORT_SYMBOL(clk_enable);
 48 
 49 void clk_disable(struct clk *clk)
 50 {
 51         unsigned long flags;
 52         spin_lock_irqsave(&clocks_lock, flags);
 53         BUG_ON(clk->count == 0);
 54         clk->count--;
 55         if (clk->count == 0)
 56                 clk->ops->disable(clk->id);
 57         spin_unlock_irqrestore(&clocks_lock, flags);
 58 }
 59 EXPORT_SYMBOL(clk_disable);
 60 
 61 int clk_reset(struct clk *clk, enum clk_reset_action action)
 62 {
 63         return clk->ops->reset(clk->remote_id, action);
 64 }
 65 EXPORT_SYMBOL(clk_reset);
 66 
 67 unsigned long clk_get_rate(struct clk *clk)
 68 {
 69         return clk->ops->get_rate(clk->id);
 70 }
 71 EXPORT_SYMBOL(clk_get_rate);
 72 
 73 int clk_set_rate(struct clk *clk, unsigned long rate)
 74 {
 75         int ret;
 76         if (clk->flags & CLKFLAG_MAX) {
 77                 ret = clk->ops->set_max_rate(clk->id, rate);
 78                 if (ret)
 79                         return ret;
 80         }
 81         if (clk->flags & CLKFLAG_MIN) {
 82                 ret = clk->ops->set_min_rate(clk->id, rate);
 83                 if (ret)
 84                         return ret;
 85         }
 86 
 87         if (clk->flags & CLKFLAG_MAX || clk->flags & CLKFLAG_MIN)
 88                 return ret;
 89 
 90         return clk->ops->set_rate(clk->id, rate);
 91 }
 92 EXPORT_SYMBOL(clk_set_rate);
 93 
 94 long clk_round_rate(struct clk *clk, unsigned long rate)
 95 {
 96         return clk->ops->round_rate(clk->id, rate);
 97 }
 98 EXPORT_SYMBOL(clk_round_rate);
 99 
100 int clk_set_min_rate(struct clk *clk, unsigned long rate)
101 {
102         return clk->ops->set_min_rate(clk->id, rate);
103 }
104 EXPORT_SYMBOL(clk_set_min_rate);
105 
106 int clk_set_max_rate(struct clk *clk, unsigned long rate)
107 {
108         return clk->ops->set_max_rate(clk->id, rate);
109 }
110 EXPORT_SYMBOL(clk_set_max_rate);
111 
112 int clk_set_parent(struct clk *clk, struct clk *parent)
113 {
114         return -ENOSYS;
115 }
116 EXPORT_SYMBOL(clk_set_parent);
117 
118 struct clk *clk_get_parent(struct clk *clk)
119 {
120         return ERR_PTR(-ENOSYS);
121 }
122 EXPORT_SYMBOL(clk_get_parent);
123 
124 int clk_set_flags(struct clk *clk, unsigned long flags)
125 {
126         if (clk == NULL || IS_ERR(clk))
127                 return -EINVAL;
128         return clk->ops->set_flags(clk->id, flags);
129 }
130 EXPORT_SYMBOL(clk_set_flags);
131 
132 /* EBI1 is the only shared clock that several clients want to vote on as of
133  * this commit. If this changes in the future, then it might be better to
134  * make clk_min_rate handle the voting or make ebi1_clk_set_min_rate more
135  * generic to support different clocks.
136  */
137 static struct clk *ebi1_clk;
138 
139 void __init msm_clock_init(struct clk_lookup *clock_tbl, unsigned num_clocks)
140 {
141         unsigned n;
142 
143         mutex_lock(&clocks_mutex);
144         for (n = 0; n < num_clocks; n++) {
145                 clkdev_add(&clock_tbl[n]);
146                 list_add_tail(&clock_tbl[n].clk->list, &clocks);
147         }
148         mutex_unlock(&clocks_mutex);
149 
150         ebi1_clk = clk_get(NULL, "ebi1_clk");
151         BUG_ON(ebi1_clk == NULL);
152 
153 }
154 
155 /* The bootloader and/or AMSS may have left various clocks enabled.
156  * Disable any clocks that belong to us (CLKFLAG_AUTO_OFF) but have
157  * not been explicitly enabled by a clk_enable() call.
158  */
159 static int __init clock_late_init(void)
160 {
161         unsigned long flags;
162         struct clk *clk;
163         unsigned count = 0;
164 
165         clock_debug_init();
166         mutex_lock(&clocks_mutex);
167         list_for_each_entry(clk, &clocks, list) {
168                 clock_debug_add(clk);
169                 if (clk->flags & CLKFLAG_AUTO_OFF) {
170                         spin_lock_irqsave(&clocks_lock, flags);
171                         if (!clk->count) {
172                                 count++;
173                                 clk->ops->auto_off(clk->id);
174                         }
175                         spin_unlock_irqrestore(&clocks_lock, flags);
176                 }
177         }
178         mutex_unlock(&clocks_mutex);
179         pr_info("clock_late_init() disabled %d unused clocks\n", count);
180         return 0;
181 }
182 
183 late_initcall(clock_late_init);
184 
185 

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