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git://projects.qi-hardware.com/openwrt-xburst.git
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1a29ef8e97
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@19815 3c298f89-4303-0410-b956-a3cf2f4a3e73
104 lines
2.3 KiB
C
104 lines
2.3 KiB
C
/*
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* arch/ubicom32/include/asm/ubicom32ring.h
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* Userspace I/O platform driver for Ubicom32 ring buffers
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*
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* (C) Copyright 2009, Ubicom, Inc.
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*
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* This file is part of the Ubicom32 Linux Kernel Port.
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*
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* The Ubicom32 Linux Kernel Port is free software: you can redistribute
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* it and/or modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, either version 2 of the
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* License, or (at your option) any later version.
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*
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* The Ubicom32 Linux Kernel Port is distributed in the hope that it
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* will be useful, but WITHOUT ANY WARRANTY; without even the implied
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* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the 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 the Ubicom32 Linux Kernel Port. If not,
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* see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _ASM_UBICOM32_UBICOM32RING_H
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#define _ASM_UBICOM32_UBICOM32RING_H
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#define UIO_UBICOM32RING_REG_VERSION 2
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struct uio_ubicom32ring_desc {
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volatile unsigned int head;
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volatile unsigned int tail;
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unsigned int entries;
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volatile unsigned int ring[0];
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};
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struct uio_ubicom32ring_regs {
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unsigned int version;
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/*
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* Magic type used to identify the ring set. Each driver will
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* have a different magic value.
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*/
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unsigned int magic;
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/*
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* Registers defined by the driver
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*/
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unsigned int regs_size;
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void *regs;
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/*
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* The locations of the rings
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*
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* DO NOT ADD ANYTHING BELOW THIS LINE
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*/
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unsigned int num_rings;
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struct uio_ubicom32ring_desc *rings[0];
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};
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/*
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* ringtio_ring_flush
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*/
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static inline void ringtio_ring_flush(struct uio_ubicom32ring_desc *rd)
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{
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rd->head = rd->tail = 0;
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}
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/*
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* ringtio_ring_get
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*/
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static inline int ringtio_ring_get(struct uio_ubicom32ring_desc *rd, void **val)
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{
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if (rd->head == rd->tail) {
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return 0;
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}
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*val = (void *)rd->ring[rd->head++];
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if (rd->head == rd->entries) {
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rd->head = 0;
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}
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return 1;
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}
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/*
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* ringtio_ring_put
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*/
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static inline int ringtio_ring_put(struct uio_ubicom32ring_desc *rd, void *val)
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{
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unsigned int newtail = rd->tail + 1;
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if (newtail == rd->entries) {
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newtail = 0;
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}
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if (newtail == rd->head) {
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return 0;
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}
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rd->ring[rd->tail] = (unsigned int)val;
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rd->tail = newtail;
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return 1;
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}
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#endif /* _ASM_UBICOM32_UBICOM32RING_H */
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