pfifo.c
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/*
* arch/arm/mach-netx/pfifo.c
*
* Copyright (c) 2005 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
*
* 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.
*
* 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 <linux/init.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/io.h>
#include <mach/hardware.h>
#include <mach/netx-regs.h>
#include <mach/pfifo.h>
static DEFINE_MUTEX(pfifo_lock);
static unsigned int pfifo_used = 0;
int pfifo_request(unsigned int pfifo_mask)
{
int err = 0;
unsigned int val;
mutex_lock(&pfifo_lock);
if (pfifo_mask & pfifo_used) {
err = -EBUSY;
goto out;
}
pfifo_used |= pfifo_mask;
val = readl(NETX_PFIFO_RESET);
writel(val | pfifo_mask, NETX_PFIFO_RESET);
writel(val, NETX_PFIFO_RESET);
out:
mutex_unlock(&pfifo_lock);
return err;
}
void pfifo_free(unsigned int pfifo_mask)
{
mutex_lock(&pfifo_lock);
pfifo_used &= ~pfifo_mask;
mutex_unlock(&pfifo_lock);
}
EXPORT_SYMBOL(pfifo_push);
EXPORT_SYMBOL(pfifo_pop);
EXPORT_SYMBOL(pfifo_fill_level);
EXPORT_SYMBOL(pfifo_empty);
EXPORT_SYMBOL(pfifo_request);
EXPORT_SYMBOL(pfifo_free);