86 lines
2.5 KiB
C
86 lines
2.5 KiB
C
/*
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* Copyright (c) 2000, 2001, 2002, 2003, 2004, 2005, 2008, 2009
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* The President and Fellows of Harvard College.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE UNIVERSITY AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE UNIVERSITY OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Driver for LAMEbus random generator card
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*/
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#include <types.h>
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#include <lib.h>
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#include <uio.h>
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#include <platform/bus.h>
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#include <lamebus/lrandom.h>
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#include "autoconf.h"
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/* Registers (offsets within slot) */
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#define LR_REG_RAND 0 /* random register */
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/* Constants */
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#define LR_RANDMAX 0xffffffff
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int
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config_lrandom(struct lrandom_softc *lr, int lrandomno)
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{
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(void)lrandomno;
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(void)lr;
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return 0;
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}
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uint32_t
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lrandom_random(void *devdata)
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{
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struct lrandom_softc *lr = devdata;
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return bus_read_register(lr->lr_bus, lr->lr_buspos, LR_REG_RAND);
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}
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uint32_t
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lrandom_randmax(void *devdata)
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{
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(void)devdata;
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return LR_RANDMAX;
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}
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int
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lrandom_read(void *devdata, struct uio *uio)
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{
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struct lrandom_softc *lr = devdata;
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uint32_t val;
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int result;
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while (uio->uio_resid > 0) {
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val = bus_read_register(lr->lr_bus, lr->lr_buspos,
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LR_REG_RAND);
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result = uiomove(&val, sizeof(val), uio);
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if (result) {
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return result;
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}
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}
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return 0;
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}
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