| 1 | /* $ZEL: sis1100_read_dma.c,v 1.3 2004/05/27 23:10:30 wuestner Exp $ */
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| 2 |
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| 3 | /*
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| 4 | * Copyright (c) 2003-2004
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| 5 | * Peter Wuestner. All rights reserved.
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| 6 | *
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| 7 | * Redistribution and use in source and binary forms, with or without
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| 8 | * modification, are permitted provided that the following conditions
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| 9 | * are met:
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| 10 | * 1. Redistributions of source code must retain the above copyright
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| 11 | * notice, this list of conditions, and the following disclaimer.
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| 12 | * 2. Redistributions in binary form must reproduce the above copyright
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| 13 | * notice, this list of conditions and the following disclaimer in the
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| 14 | * documentation and/or other materials provided with the distribution.
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| 15 | *
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| 16 | * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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| 17 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 18 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 19 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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| 20 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 21 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 22 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 23 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 24 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 25 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 26 | * SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | #include "sis1100_sc.h"
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| 30 |
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| 31 | ssize_t
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| 32 | sis1100_read_dma(
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| 33 | struct sis1100_softc* sc,
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| 34 | struct sis1100_fdata* fd,
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| 35 | u_int32_t addr, /* VME or SDRAM address */
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| 36 | int32_t am, /* address modifier, not used if <0 */
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| 37 | int size, /* datasize (1, 2 or 4) */
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| 38 | int space, /* remote space (1,2: VME; 6: SDRAM) */
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| 39 | int fifo_mode,
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| 40 | size_t count, /* words to be transferred */
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| 41 | /* count==0 is illegal */
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| 42 | size_t* count_read, /* words transferred */
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| 43 | u_int8_t* data, /* destination (user virtual address) */
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| 44 | int* prot_err
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| 45 | )
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| 46 | {
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| 47 | int res, eot;
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| 48 | size_t _count_read, orig_count=count;
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| 49 |
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| 50 | SEM_LOCK(sc->sem_hw);
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| 51 | do {
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| 52 | size_t counter;
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| 53 |
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| 54 | res=_sis1100_read_dma(sc, fd, addr, am, size, space, fifo_mode,
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| 55 | count, &_count_read, data, prot_err, &eot);
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| 56 |
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| 57 | if (res) break;
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| 58 |
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| 59 | counter=_count_read*size;
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| 60 | if (!fifo_mode) addr+=counter;
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| 61 | data+=counter;
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| 62 | count-=_count_read;
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| 63 | } while (count && !eot && !*prot_err);
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| 64 |
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| 65 | SEM_UNLOCK(sc->sem_hw);
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| 66 |
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| 67 | *count_read=orig_count-count;
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| 68 | return res;
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| 69 | }
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