mirror of https://gitee.com/openkylin/linux.git
69 lines
1.6 KiB
C
69 lines
1.6 KiB
C
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/*
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* arch/arm/mach-netx/pfifo.c
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*
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* Copyright (c) 2005 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <asm/io.h>
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#include <asm/hardware.h>
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#include <asm/arch/netx-regs.h>
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#include <asm/arch/pfifo.h>
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static DEFINE_MUTEX(pfifo_lock);
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static unsigned int pfifo_used = 0;
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int pfifo_request(unsigned int pfifo_mask)
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{
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int err = 0;
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unsigned int val;
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mutex_lock(&pfifo_lock);
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if (pfifo_mask & pfifo_used) {
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err = -EBUSY;
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goto out;
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}
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pfifo_used |= pfifo_mask;
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val = readl(NETX_PFIFO_RESET);
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writel(val | pfifo_mask, NETX_PFIFO_RESET);
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writel(val, NETX_PFIFO_RESET);
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out:
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mutex_unlock(&pfifo_lock);
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return err;
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}
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void pfifo_free(unsigned int pfifo_mask)
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{
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mutex_lock(&pfifo_lock);
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pfifo_used &= ~pfifo_mask;
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mutex_unlock(&pfifo_lock);
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}
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EXPORT_SYMBOL(pfifo_push);
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EXPORT_SYMBOL(pfifo_pop);
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EXPORT_SYMBOL(pfifo_fill_level);
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EXPORT_SYMBOL(pfifo_empty);
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EXPORT_SYMBOL(pfifo_request);
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EXPORT_SYMBOL(pfifo_free);
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