forked from luck/tmp_suning_uos_patched
37a298fb6a
Signed-off-by: Gregory Bean <gbean@codeaurora.org> Signed-off-by: David Brown <davidb@codeaurora.org> Signed-off-by: Daniel Walker <dwalker@codeaurora.org> Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org> Signed-off-by: Stepan Moskovchenko <stepanm@codeaurora.org>
337 lines
7.8 KiB
C
337 lines
7.8 KiB
C
/* arch/arm/mach-msm/clock.c
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*
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* Copyright (C) 2007 Google, Inc.
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* Copyright (c) 2007-2010, Code Aurora Forum. All rights reserved.
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/version.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/list.h>
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#include <linux/err.h>
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#include <linux/clk.h>
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#include <linux/spinlock.h>
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#include <linux/debugfs.h>
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#include <linux/ctype.h>
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#include <linux/pm_qos_params.h>
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#include <mach/clk.h>
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#include "clock.h"
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#include "proc_comm.h"
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#include "clock-7x30.h"
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static DEFINE_MUTEX(clocks_mutex);
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static DEFINE_SPINLOCK(clocks_lock);
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static LIST_HEAD(clocks);
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struct clk *msm_clocks;
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unsigned msm_num_clocks;
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/*
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* Bitmap of enabled clocks, excluding ACPU which is always
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* enabled
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*/
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static DECLARE_BITMAP(clock_map_enabled, NR_CLKS);
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static DEFINE_SPINLOCK(clock_map_lock);
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/*
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* Standard clock functions defined in include/linux/clk.h
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*/
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struct clk *clk_get(struct device *dev, const char *id)
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{
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struct clk *clk;
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mutex_lock(&clocks_mutex);
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list_for_each_entry(clk, &clocks, list)
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if (!strcmp(id, clk->name) && clk->dev == dev)
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goto found_it;
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list_for_each_entry(clk, &clocks, list)
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if (!strcmp(id, clk->name) && clk->dev == NULL)
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goto found_it;
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clk = ERR_PTR(-ENOENT);
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found_it:
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mutex_unlock(&clocks_mutex);
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return clk;
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}
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EXPORT_SYMBOL(clk_get);
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void clk_put(struct clk *clk)
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{
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}
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EXPORT_SYMBOL(clk_put);
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int clk_enable(struct clk *clk)
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{
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unsigned long flags;
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spin_lock_irqsave(&clocks_lock, flags);
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clk->count++;
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if (clk->count == 1) {
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clk->ops->enable(clk->id);
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spin_lock(&clock_map_lock);
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clock_map_enabled[BIT_WORD(clk->id)] |= BIT_MASK(clk->id);
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spin_unlock(&clock_map_lock);
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}
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spin_unlock_irqrestore(&clocks_lock, flags);
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return 0;
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}
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EXPORT_SYMBOL(clk_enable);
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void clk_disable(struct clk *clk)
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{
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unsigned long flags;
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spin_lock_irqsave(&clocks_lock, flags);
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BUG_ON(clk->count == 0);
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clk->count--;
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if (clk->count == 0) {
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clk->ops->disable(clk->id);
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spin_lock(&clock_map_lock);
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clock_map_enabled[BIT_WORD(clk->id)] &= ~BIT_MASK(clk->id);
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spin_unlock(&clock_map_lock);
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}
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spin_unlock_irqrestore(&clocks_lock, flags);
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}
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EXPORT_SYMBOL(clk_disable);
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int clk_reset(struct clk *clk, enum clk_reset_action action)
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{
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if (!clk->ops->reset)
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clk->ops->reset = &pc_clk_reset;
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return clk->ops->reset(clk->remote_id, action);
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}
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EXPORT_SYMBOL(clk_reset);
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unsigned long clk_get_rate(struct clk *clk)
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{
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return clk->ops->get_rate(clk->id);
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}
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EXPORT_SYMBOL(clk_get_rate);
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int clk_set_rate(struct clk *clk, unsigned long rate)
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{
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return clk->ops->set_rate(clk->id, rate);
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}
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EXPORT_SYMBOL(clk_set_rate);
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long clk_round_rate(struct clk *clk, unsigned long rate)
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{
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return clk->ops->round_rate(clk->id, rate);
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}
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EXPORT_SYMBOL(clk_round_rate);
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int clk_set_min_rate(struct clk *clk, unsigned long rate)
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{
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return clk->ops->set_min_rate(clk->id, rate);
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}
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EXPORT_SYMBOL(clk_set_min_rate);
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int clk_set_max_rate(struct clk *clk, unsigned long rate)
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{
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return clk->ops->set_max_rate(clk->id, rate);
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}
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EXPORT_SYMBOL(clk_set_max_rate);
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int clk_set_parent(struct clk *clk, struct clk *parent)
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{
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return -ENOSYS;
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}
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EXPORT_SYMBOL(clk_set_parent);
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struct clk *clk_get_parent(struct clk *clk)
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{
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return ERR_PTR(-ENOSYS);
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}
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EXPORT_SYMBOL(clk_get_parent);
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int clk_set_flags(struct clk *clk, unsigned long flags)
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{
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if (clk == NULL || IS_ERR(clk))
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return -EINVAL;
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return clk->ops->set_flags(clk->id, flags);
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}
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EXPORT_SYMBOL(clk_set_flags);
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/* EBI1 is the only shared clock that several clients want to vote on as of
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* this commit. If this changes in the future, then it might be better to
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* make clk_min_rate handle the voting or make ebi1_clk_set_min_rate more
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* generic to support different clocks.
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*/
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static struct clk *ebi1_clk;
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static void __init set_clock_ops(struct clk *clk)
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{
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if (!clk->ops) {
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clk->ops = &clk_ops_pcom;
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clk->id = clk->remote_id;
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}
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}
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void __init msm_clock_init(struct clk *clock_tbl, unsigned num_clocks)
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{
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unsigned n;
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spin_lock_init(&clocks_lock);
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mutex_lock(&clocks_mutex);
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msm_clocks = clock_tbl;
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msm_num_clocks = num_clocks;
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for (n = 0; n < msm_num_clocks; n++) {
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set_clock_ops(&msm_clocks[n]);
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list_add_tail(&msm_clocks[n].list, &clocks);
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}
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mutex_unlock(&clocks_mutex);
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ebi1_clk = clk_get(NULL, "ebi1_clk");
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BUG_ON(ebi1_clk == NULL);
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}
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#if defined(CONFIG_DEBUG_FS)
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static struct clk *msm_clock_get_nth(unsigned index)
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{
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if (index < msm_num_clocks)
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return msm_clocks + index;
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else
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return 0;
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}
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static int clock_debug_rate_set(void *data, u64 val)
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{
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struct clk *clock = data;
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int ret;
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/* Only increases to max rate will succeed, but that's actually good
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* for debugging purposes. So we don't check for error. */
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if (clock->flags & CLK_MAX)
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clk_set_max_rate(clock, val);
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if (clock->flags & CLK_MIN)
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ret = clk_set_min_rate(clock, val);
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else
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ret = clk_set_rate(clock, val);
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if (ret != 0)
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printk(KERN_ERR "clk_set%s_rate failed (%d)\n",
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(clock->flags & CLK_MIN) ? "_min" : "", ret);
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return ret;
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}
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static int clock_debug_rate_get(void *data, u64 *val)
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{
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struct clk *clock = data;
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*val = clk_get_rate(clock);
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return 0;
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}
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static int clock_debug_enable_set(void *data, u64 val)
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{
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struct clk *clock = data;
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int rc = 0;
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if (val)
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rc = clock->ops->enable(clock->id);
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else
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clock->ops->disable(clock->id);
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return rc;
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}
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static int clock_debug_enable_get(void *data, u64 *val)
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{
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struct clk *clock = data;
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*val = clock->ops->is_enabled(clock->id);
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return 0;
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}
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static int clock_debug_local_get(void *data, u64 *val)
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{
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struct clk *clock = data;
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*val = clock->ops != &clk_ops_pcom;
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return 0;
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}
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DEFINE_SIMPLE_ATTRIBUTE(clock_rate_fops, clock_debug_rate_get,
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clock_debug_rate_set, "%llu\n");
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DEFINE_SIMPLE_ATTRIBUTE(clock_enable_fops, clock_debug_enable_get,
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clock_debug_enable_set, "%llu\n");
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DEFINE_SIMPLE_ATTRIBUTE(clock_local_fops, clock_debug_local_get,
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NULL, "%llu\n");
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static int __init clock_debug_init(void)
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{
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struct dentry *dent_rate, *dent_enable, *dent_local;
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struct clk *clock;
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unsigned n = 0;
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char temp[50], *ptr;
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dent_rate = debugfs_create_dir("clk_rate", 0);
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if (IS_ERR(dent_rate))
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return PTR_ERR(dent_rate);
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dent_enable = debugfs_create_dir("clk_enable", 0);
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if (IS_ERR(dent_enable))
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return PTR_ERR(dent_enable);
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dent_local = debugfs_create_dir("clk_local", NULL);
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if (IS_ERR(dent_local))
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return PTR_ERR(dent_local);
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while ((clock = msm_clock_get_nth(n++)) != 0) {
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strncpy(temp, clock->dbg_name, ARRAY_SIZE(temp)-1);
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for (ptr = temp; *ptr; ptr++)
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*ptr = tolower(*ptr);
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debugfs_create_file(temp, 0644, dent_rate,
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clock, &clock_rate_fops);
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debugfs_create_file(temp, 0644, dent_enable,
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clock, &clock_enable_fops);
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debugfs_create_file(temp, S_IRUGO, dent_local,
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clock, &clock_local_fops);
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}
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return 0;
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}
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device_initcall(clock_debug_init);
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#endif
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/* The bootloader and/or AMSS may have left various clocks enabled.
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* Disable any clocks that belong to us (CLKFLAG_AUTO_OFF) but have
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* not been explicitly enabled by a clk_enable() call.
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*/
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static int __init clock_late_init(void)
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{
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unsigned long flags;
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struct clk *clk;
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unsigned count = 0;
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mutex_lock(&clocks_mutex);
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list_for_each_entry(clk, &clocks, list) {
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if (clk->flags & CLKFLAG_AUTO_OFF) {
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spin_lock_irqsave(&clocks_lock, flags);
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if (!clk->count) {
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count++;
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clk->ops->auto_off(clk->id);
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}
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spin_unlock_irqrestore(&clocks_lock, flags);
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}
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}
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mutex_unlock(&clocks_mutex);
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pr_info("clock_late_init() disabled %d unused clocks\n", count);
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return 0;
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}
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late_initcall(clock_late_init);
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