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/*
* arch/ubicom32/include/asm/ubicom32ring.h
* Userspace I/O platform driver for Ubicom32 ring buffers
*
* (C) Copyright 2009, Ubicom, Inc.
*
* This file is part of the Ubicom32 Linux Kernel Port.
*
* The Ubicom32 Linux Kernel Port is free software: you can redistribute
* it and/or modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, either version 2 of the
* License, or (at your option) any later version.
*
* The Ubicom32 Linux Kernel Port 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 the Ubicom32 Linux Kernel Port. If not,
* see <http://www.gnu.org/licenses/>.
*/
#ifndef _ASM_UBICOM32_UBICOM32RING_H
#define _ASM_UBICOM32_UBICOM32RING_H
#define UIO_UBICOM32RING_REG_VERSION 2
struct uio_ubicom32ring_desc {
volatile unsigned int head;
volatile unsigned int tail;
unsigned int entries;
volatile unsigned int ring[0];
};
struct uio_ubicom32ring_regs {
unsigned int version;
/*
* Magic type used to identify the ring set. Each driver will
* have a different magic value.
*/
unsigned int magic;
/*
* Registers defined by the driver
*/
unsigned int regs_size;
void *regs;
/*
* The locations of the rings
*
* DO NOT ADD ANYTHING BELOW THIS LINE
*/
unsigned int num_rings;
struct uio_ubicom32ring_desc *rings[0];
};
/*
* ringtio_ring_flush
*/
static inline void ringtio_ring_flush(struct uio_ubicom32ring_desc *rd)
{
rd->head = rd->tail = 0;
}
/*
* ringtio_ring_get
*/
static inline int ringtio_ring_get(struct uio_ubicom32ring_desc *rd, void **val)
{
if (rd->head == rd->tail) {
return 0;
}
*val = (void *)rd->ring[rd->head++];
if (rd->head == rd->entries) {
rd->head = 0;
}
return 1;
}
/*
* ringtio_ring_put
*/
static inline int ringtio_ring_put(struct uio_ubicom32ring_desc *rd, void *val)
{
unsigned int newtail = rd->tail + 1;
if (newtail == rd->entries) {
newtail = 0;
}
if (newtail == rd->head) {
return 0;
}
rd->ring[rd->tail] = (unsigned int)val;
rd->tail = newtail;
return 1;
}
#endif /* _ASM_UBICOM32_UBICOM32RING_H */
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