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/*
* arch/arm/mach-sunxi/arisc/hwspinlock/hwspinlock.c
*
* Copyright (c) 2012 Allwinner.
* 2012-10-01 Written by superm (superm@allwinnertech.com).
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "hwspinlock_i.h"
static struct arisc_hwspinlock arisc_hwspinlocks[ARISC_HW_SPINLOCK_NUM];
static uintptr_t base;
/**
* initialize hwspinlock.
* @para: none.
*
* returns: 0 if initialize hwspinlock succeeded, others if failed.
*/
int arisc_hwspinlock_init(void)
{
base = dts_cfg.hwspinlock.base;
return 0;
}
/**
* exit hwspinlock.
* @para:none.
*
* returns: 0 if exit hwspinlock succeeded, others if failed.
*/
int arisc_hwspinlock_exit(void)
{
return 0;
}
/**
* lock an hwspinlock with timeout limit,
* and hwspinlock will be unlocked in arisc_hwspin_unlock().
* @hwid: an hwspinlock id which we want to lock.
*
* returns: 0 if lock hwspinlock succeeded, other if failed.
*/
int arisc_hwspin_lock(int hwid)
{
arisc_hwspinlock_t *spinlock;
if (hwid >= ARISC_HW_SPINLOCK_NUM) {
ARISC_ERR("invalid hwspinlock id [%d] for trylock\n", hwid);
return -EINVAL;
}
spinlock = &(arisc_hwspinlocks[hwid]);
/* is lock already taken by another context on the local cpu ? */
spin_lock(&(spinlock->lock));
/* try to take spinlock */
while (readl(base + AW_SPINLOCK_LOCK_REG(hwid)) == AW_SPINLOCK_TAKEN);
return 0;
}
/**
* unlock a specific hwspinlock.
* hwid: an hwspinlock id which we want to unlock.
*
* returns: 0 if unlock hwspinlock succeeded, other if failed.
*/
int arisc_hwspin_unlock(int hwid)
{
arisc_hwspinlock_t *spinlock;
if (hwid >= ARISC_HW_SPINLOCK_NUM) {
ARISC_ERR("invalid hwspinlock id [%d] for unlock\n", hwid);
return -EINVAL;
}
spinlock = &(arisc_hwspinlocks[hwid]);
/* untaken the spinlock */
writel(0x0, base + AW_SPINLOCK_LOCK_REG(hwid));
spin_unlock(&(spinlock->lock));
return 0;
}
int arisc_hwspinlock_standby_suspend(void)
{
return 0;
}
int arisc_hwspinlock_standby_resume(void)
{
return 0;
}
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