1/*
2 * arch/arm/mach-netx/pfifo.c
3 *
4 * Copyright (c) 2005 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2
8 * as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
18 */
19
20#include <linux/init.h>
21#include <linux/module.h>
22#include <linux/mutex.h>
23
24#include <asm/io.h>
25#include <asm/hardware.h>
26#include <asm/arch/netx-regs.h>
27#include <asm/arch/pfifo.h>
28
29static DEFINE_MUTEX(pfifo_lock);
30
31static unsigned int pfifo_used = 0;
32
33int pfifo_request(unsigned int pfifo_mask)
34{
35	int err = 0;
36	unsigned int val;
37
38	mutex_lock(&pfifo_lock);
39
40	if (pfifo_mask & pfifo_used) {
41		err = -EBUSY;
42		goto out;
43	}
44
45	pfifo_used |= pfifo_mask;
46
47	val = readl(NETX_PFIFO_RESET);
48	writel(val | pfifo_mask, NETX_PFIFO_RESET);
49	writel(val, NETX_PFIFO_RESET);
50
51out:
52	mutex_unlock(&pfifo_lock);
53	return err;
54}
55
56void pfifo_free(unsigned int pfifo_mask)
57{
58	mutex_lock(&pfifo_lock);
59	pfifo_used &= ~pfifo_mask;
60	mutex_unlock(&pfifo_lock);
61}
62
63EXPORT_SYMBOL(pfifo_push);
64EXPORT_SYMBOL(pfifo_pop);
65EXPORT_SYMBOL(pfifo_fill_level);
66EXPORT_SYMBOL(pfifo_empty);
67EXPORT_SYMBOL(pfifo_request);
68EXPORT_SYMBOL(pfifo_free);
69