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Commit ef70cd4d authored by Sascha Hauer's avatar Sascha Hauer Committed by Russell King
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[ARM] 3568/2: netX: pointer fifo driver 



Patch from Sascha Hauer

This patch adds support for the pointer FIFOs on netX.

Signed-off-by: default avatarRobert Schwebel <r.schwebel@pengutronix.de>
Signed-off-by: default avatarSascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent bb6d8c88

arch/arm/mach-netx/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -7,5 +7,5 @@ 


# Object file lists.



obj-y			+= time.o generic.o

obj-y			+= time.o generic.o pfifo.o

arch/arm/mach-netx/pfifo.c

0 → 100644
+68 −0
Original line number Diff line number Diff line 
/*

 * 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);

include/asm-arm/arch-netx/pfifo.h

0 → 100644
+54 −0
Original line number Diff line number Diff line 
/*

 * 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 */