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[ARM] 3568/2: netX: pointer fifo driver

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Patch from Sascha Hauer

This patch adds support for the pointer FIFOs on netX.

Signed-off-by: Robert Schwebel <r.schwebel@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Sascha Hauer 2006-06-19 15:28:19 +01:00 committed by Russell King
parent bb6d8c8828
commit ef70cd4d24
3 changed files with 123 additions and 1 deletions
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2
arch/arm/mach-netx/Makefile
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@ -7,5 +7,5 @@
# Object file lists.
obj-y += time.o generic.o
obj-y += time.o generic.o pfifo.o

68
arch/arm/mach-netx/pfifo.c Normal file
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@ -0,0 +1,68 @@
/*
* 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 <asm/io.h>
#include <asm/hardware.h>
#include <asm/arch/netx-regs.h>
#include <asm/arch/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);

54
include/asm-arm/arch-netx/pfifo.h Normal file
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@ -0,0 +1,54 @@
/*
* include/asm-arm/arch-netx/pfifo.h
*
* 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
*/
#ifndef ASM_ARCH_PFIFO_H
#define ASM_ARCH_PFIFO_H
static inline int pfifo_push(int no, unsigned int pointer)
{
writel(pointer, NETX_PFIFO_BASE(no));
return 0;
}
static inline unsigned int pfifo_pop(int no)
{
return readl(NETX_PFIFO_BASE(no));
}
static inline int pfifo_fill_level(int no)
{
return readl(NETX_PFIFO_FILL_LEVEL(no));
}
static inline int pfifo_full(int no)
{
return readl(NETX_PFIFO_FULL) & (1<<no) ? 1 : 0;
}
static inline int pfifo_empty(int no)
{
return readl(NETX_PFIFO_EMPTY) & (1<<no) ? 1 : 0;
}
int pfifo_request(unsigned int pfifo_mask);
void pfifo_free(unsigned int pfifo_mask);
#endif /* ASM_ARCH_PFIFO_H */