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/* Copyright (c) 2008-2009, 2011, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* 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/err.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/delay.h>
#include <asm/system.h>
#include <mach/msm_iomap.h>
#include <mach/remote_spinlock.h>
#include <mach/dal.h>
#include "smd_private.h"
#include <linux/module.h>
static void remote_spin_release_all_locks(uint32_t pid, int count);
#if defined(CONFIG_MSM_REMOTE_SPINLOCK_SFPB)
#define SFPB_SPINLOCK_COUNT 8
#define MSM_SFPB_MUTEX_REG_BASE 0x01200600
#define MSM_SFPB_MUTEX_REG_SIZE (33 * 4)
static void *hw_mutex_reg_base;
static DEFINE_MUTEX(hw_map_init_lock);
static int remote_spinlock_init_address(int id, _remote_spinlock_t *lock)
{
if (id >= SFPB_SPINLOCK_COUNT)
return -EINVAL;
if (!hw_mutex_reg_base) {
mutex_lock(&hw_map_init_lock);
if (!hw_mutex_reg_base)
hw_mutex_reg_base = ioremap(MSM_SFPB_MUTEX_REG_BASE,
MSM_SFPB_MUTEX_REG_SIZE);
mutex_unlock(&hw_map_init_lock);
BUG_ON(hw_mutex_reg_base == NULL);
}
*lock = hw_mutex_reg_base + 0x4 + id * 4;
return 0;
}
void _remote_spin_release_all(uint32_t pid)
{
remote_spin_release_all_locks(pid, SFPB_SPINLOCK_COUNT);
}
#else
#define SMEM_SPINLOCK_COUNT 8
#define SMEM_SPINLOCK_ARRAY_SIZE (SMEM_SPINLOCK_COUNT * sizeof(uint32_t))
static int remote_spinlock_init_address(int id, _remote_spinlock_t *lock)
{
_remote_spinlock_t spinlock_start;
if (id >= SMEM_SPINLOCK_COUNT)
return -EINVAL;
spinlock_start = smem_alloc(SMEM_SPINLOCK_ARRAY,
SMEM_SPINLOCK_ARRAY_SIZE);
if (spinlock_start == NULL)
return -ENXIO;
*lock = spinlock_start + id;
return 0;
}
void _remote_spin_release_all(uint32_t pid)
{
remote_spin_release_all_locks(pid, SMEM_SPINLOCK_COUNT);
}
#endif
/**
* Release all spinlocks owned by @pid.
*
* This is only to be used for situations where the processor owning
* spinlocks has crashed and the spinlocks must be released.
*
* @pid - processor ID of processor to release
*/
static void remote_spin_release_all_locks(uint32_t pid, int count)
{
int n;
_remote_spinlock_t lock;
for (n = 0; n < count; ++n) {
if (remote_spinlock_init_address(n, &lock) == 0)
_remote_spin_release(&lock, pid);
}
}
static int
remote_spinlock_dal_init(const char *chunk_name, _remote_spinlock_t *lock)
{
void *dal_smem_start, *dal_smem_end;
uint32_t dal_smem_size;
struct dal_chunk_header *cur_header;
if (!chunk_name)
return -EINVAL;
dal_smem_start = smem_get_entry(SMEM_DAL_AREA, &dal_smem_size);
if (!dal_smem_start)
return -ENXIO;
dal_smem_end = dal_smem_start + dal_smem_size;
/* Find first chunk header */
cur_header = (struct dal_chunk_header *)
(((uint32_t)dal_smem_start + (4095)) & ~4095);
*lock = NULL;
while (cur_header->size != 0
&& ((uint32_t)(cur_header + 1) < (uint32_t)dal_smem_end)) {
/* Check if chunk name matches */
if (!strncmp(cur_header->name, chunk_name,
DAL_CHUNK_NAME_LENGTH)) {
*lock = (_remote_spinlock_t)&cur_header->lock;
return 0;
}
cur_header = (void *)cur_header + cur_header->size;
}
pr_err("%s: DAL remote lock \"%s\" not found.\n", __func__,
chunk_name);
return -EINVAL;
}
int _remote_spin_lock_init(remote_spinlock_id_t id, _remote_spinlock_t *lock)
{
BUG_ON(id == NULL);
if (id[0] == 'D' && id[1] == ':') {
/* DAL chunk name starts after "D:" */
return remote_spinlock_dal_init(&id[2], lock);
} else if (id[0] == 'S' && id[1] == ':') {
/* Single-digit lock ID follows "S:" */
BUG_ON(id[3] != '\0');
return remote_spinlock_init_address((((uint8_t)id[2])-'0'),
lock);
} else {
return -EINVAL;
}
}
int _remote_mutex_init(struct remote_mutex_id *id, _remote_mutex_t *lock)
{
BUG_ON(id == NULL);
lock->delay_us = id->delay_us;
return _remote_spin_lock_init(id->r_spinlock_id, &(lock->r_spinlock));
}
EXPORT_SYMBOL(_remote_mutex_init);
void _remote_mutex_lock(_remote_mutex_t *lock)
{
while (!_remote_spin_trylock(&(lock->r_spinlock))) {
if (lock->delay_us >= 1000)
msleep(lock->delay_us/1000);
else
udelay(lock->delay_us);
}
}
EXPORT_SYMBOL(_remote_mutex_lock);
void _remote_mutex_unlock(_remote_mutex_t *lock)
{
_remote_spin_unlock(&(lock->r_spinlock));
}
EXPORT_SYMBOL(_remote_mutex_unlock);
int _remote_mutex_trylock(_remote_mutex_t *lock)
{
return _remote_spin_trylock(&(lock->r_spinlock));
}
EXPORT_SYMBOL(_remote_mutex_trylock);
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