kernel-fxtec-pro1x/arch/arm/mach-msm/clock.c
Daniel Walker 5e96da5d50 msm: generalize clock support.
The 'PCOM' method of clock control (commands issued to the radio
CPU) is shared across several (but not all) Qualcomm SOCs.
Generalize this clock mechanism so these other SOCs can be added.

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>
2010-05-13 16:08:20 -07:00

335 lines
7.8 KiB
C

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