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/* linux/arch/arm/mach-exynos/dev.c
*
* Copyright (c) 2011 Samsung Electronics Co., Ltd.
* http://www.samsung.com
*
* EXYNOS4 Device List support
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/device.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <mach/dev.h>
#ifdef CONFIG_ARCH_EXYNOS4
#include <mach/busfreq_exynos4.h>
#else
#include <mach/busfreq_exynos5.h>
#endif
static LIST_HEAD(domains_list);
static DEFINE_MUTEX(domains_mutex);
static struct device_domain *find_device_domain(struct device *dev)
{
struct device_domain *tmp_domain, *domain = ERR_PTR(-ENODEV);
mutex_lock(&domains_mutex);
list_for_each_entry(tmp_domain, &domains_list, node) {
if (tmp_domain->device == dev) {
domain = tmp_domain;
break;
}
}
mutex_unlock(&domains_mutex);
return domain;
}
int dev_add(struct device_domain *dev, struct device *device)
{
if (!dev || !device)
return -EINVAL;
mutex_lock(&domains_mutex);
INIT_LIST_HEAD(&dev->domain_list);
dev->device = device;
list_add(&dev->node, &domains_list);
mutex_unlock(&domains_mutex);
return 0;
}
struct device *dev_get(const char *name)
{
struct device_domain *domain;
mutex_lock(&domains_mutex);
list_for_each_entry(domain, &domains_list, node)
if (strcmp(name, dev_name(domain->device)) == 0)
goto found;
mutex_unlock(&domains_mutex);
return ERR_PTR(-ENODEV);
found:
mutex_unlock(&domains_mutex);
return domain->device;
}
void dev_put(const char *name)
{
return;
}
int dev_lock(struct device *device, struct device *dev,
unsigned long freq)
{
struct device_domain *domain;
struct domain_lock *lock;
int ret = 0;
domain = find_device_domain(device);
if (IS_ERR(domain)) {
dev_err(dev, "Can't find device domain.\n");
return -EINVAL;
}
mutex_lock(&domains_mutex);
list_for_each_entry(lock, &domain->domain_list, node) {
if (lock->device == dev) {
/* If the lock already exist, only update the freq */
lock->freq = freq;
goto out;
}
}
lock = kzalloc(sizeof(struct domain_lock), GFP_KERNEL);
if (!lock) {
dev_err(device, "Unable to create domain_lock");
ret = -ENOMEM;
goto out;
}
lock->device = dev;
lock->freq = freq;
list_add(&lock->node, &domain->domain_list);
out:
mutex_unlock(&domains_mutex);
exynos_request_apply(freq);
return ret;
}
int dev_unlock(struct device *device, struct device *dev)
{
struct device_domain *domain;
struct domain_lock *lock;
domain = find_device_domain(device);
if (IS_ERR(domain)) {
dev_err(dev, "Can't find device domain.\n");
return -EINVAL;
}
mutex_lock(&domains_mutex);
list_for_each_entry(lock, &domain->domain_list, node) {
if (lock->device == dev) {
list_del(&lock->node);
kfree(lock);
break;
}
}
mutex_unlock(&domains_mutex);
return 0;
}
unsigned long dev_max_freq(struct device *device)
{
struct device_domain *domain;
struct domain_lock *lock;
unsigned long freq = 0;
domain = find_device_domain(device);
if (IS_ERR(domain)) {
dev_dbg(device, "Can't find device domain.\n");
return freq;
}
mutex_lock(&domains_mutex);
list_for_each_entry(lock, &domain->domain_list, node)
if (lock->freq > freq)
freq = lock->freq;
mutex_unlock(&domains_mutex);
return freq;
}
int dev_lock_list(struct device *device, char *buf)
{
struct device_domain *domain;
struct domain_lock *lock;
int count = 0;
domain = find_device_domain(device);
if (IS_ERR(domain)) {
dev_dbg(device, "Can't find device domain.\n");
return 0;
}
mutex_lock(&domains_mutex);
count = sprintf(buf, "Lock List\n");
list_for_each_entry(lock, &domain->domain_list, node)
count += sprintf(buf + count, "%s : %lu\n", dev_name(lock->device), lock->freq);
mutex_unlock(&domains_mutex);
return count;
}
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