Annotation of sys/arch/hp300/dev/dmareg.h, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: dmareg.h,v 1.9 2005/11/17 23:56:02 miod Exp $ */
! 2: /* $NetBSD: dmareg.h,v 1.12 1997/05/05 21:02:40 thorpej Exp $ */
! 3:
! 4: /*
! 5: * Copyright (c) 1982, 1990, 1993
! 6: * The Regents of the University of California. All rights reserved.
! 7: *
! 8: * Redistribution and use in source and binary forms, with or without
! 9: * modification, are permitted provided that the following conditions
! 10: * are met:
! 11: * 1. Redistributions of source code must retain the above copyright
! 12: * notice, this list of conditions and the following disclaimer.
! 13: * 2. Redistributions in binary form must reproduce the above copyright
! 14: * notice, this list of conditions and the following disclaimer in the
! 15: * documentation and/or other materials provided with the distribution.
! 16: * 3. Neither the name of the University nor the names of its contributors
! 17: * may be used to endorse or promote products derived from this software
! 18: * without specific prior written permission.
! 19: *
! 20: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 21: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 22: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 23: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 24: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 25: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 26: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 27: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 28: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 29: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 30: * SUCH DAMAGE.
! 31: *
! 32: * @(#)dmareg.h 8.1 (Berkeley) 6/10/93
! 33: */
! 34:
! 35: #include <hp300/dev/iotypes.h> /* XXX */
! 36:
! 37: /*
! 38: * Hardware layout for the 98620[ABC]:
! 39: * 98620A (old 320s?): byte/word DMA in up to 64K chunks
! 40: * 98620B (320s only): 98620A with programmable IPL
! 41: * 98620C (all others): byte/word/longword DMA in up to 4Gb chunks
! 42: */
! 43:
! 44: struct dmaBdevice {
! 45: v_char *dmaB_addr;
! 46: vu_short dmaB_count;
! 47: vu_short dmaB_cmd;
! 48: #define dmaB_stat dmaB_cmd
! 49: };
! 50:
! 51: struct dmadevice {
! 52: v_char *dma_addr;
! 53: vu_int dma_count;
! 54: vu_short dma_cmd;
! 55: vu_short dma_stat;
! 56: };
! 57:
! 58: struct dmareg {
! 59: struct dmaBdevice dma_Bchan0;
! 60: struct dmaBdevice dma_Bchan1;
! 61: /* the rest are 98620C specific */
! 62: v_char dma_id[4];
! 63: vu_char dma_cr;
! 64: char dma_pad1[0xEB];
! 65: struct dmadevice dma_chan0;
! 66: char dma_pad2[0xF4];
! 67: struct dmadevice dma_chan1;
! 68: };
! 69:
! 70: /* The hp300 has 2 DMA channels. */
! 71: #define NDMACHAN 2
! 72:
! 73: /* addresses */
! 74: #define DMA_BASE IIOV(0x500000)
! 75:
! 76: /* command bits */
! 77: #define DMA_ENAB 0x0001
! 78: #define DMA_WORD 0x0002
! 79: #define DMA_WRT 0x0004
! 80: #define DMA_PRI 0x0008
! 81: #define DMA_IPL(x) (((x) - 3) << 4)
! 82: #define DMA_LWORD 0x0100
! 83: #define DMA_START 0x8000
! 84:
! 85: /* status bits */
! 86: #define DMA_ARMED 0x01
! 87: #define DMA_INTR 0x02
! 88: #define DMA_ACC 0x04
! 89: #define DMA_HALT 0x08
! 90: #define DMA_BERR 0x10
! 91: #define DMA_ALIGN 0x20
! 92: #define DMA_WRAP 0x40
! 93:
! 94: #ifdef _KERNEL
! 95: /*
! 96: * Macros to attempt to hide the HW differences between the 98620B DMA
! 97: * board and the 1TQ4-0401 DMA chip (68020C "board"). The latter
! 98: * includes emulation registers for the former but you need to access
! 99: * the "native-mode" registers directly in order to do 32-bit DMA.
! 100: *
! 101: * DMA_CLEAR: Clear interrupt on DMA board. We just use the
! 102: * emulation registers on the 98620C as that is easiest.
! 103: * DMA_STAT: Read status register. Again, we always read the
! 104: * emulation register. Someday we might want to
! 105: * look at the 98620C status to get the extended bits.
! 106: * DMA_ARM: Load address, count and kick-off DMA.
! 107: */
! 108: #define DMA_CLEAR(dc) do { \
! 109: v_int dmaclr; \
! 110: dmaclr = (int)dc->dm_Bhwaddr->dmaB_addr; \
! 111: } while (0);
! 112: #define DMA_STAT(dc) dc->dm_Bhwaddr->dmaB_stat
! 113:
! 114: #if defined(HP320)
! 115: #define DMA_ARM(sc, dc) \
! 116: if (sc->sc_type == DMA_B) { \
! 117: struct dmaBdevice *dma = dc->dm_Bhwaddr; \
! 118: dma->dmaB_addr = (v_char *)dc->dm_chain[dc->dm_cur].dc_addr; \
! 119: dma->dmaB_count = dc->dm_chain[dc->dm_cur].dc_count - 1; \
! 120: dma->dmaB_cmd = dc->dm_cmd; \
! 121: } else { \
! 122: struct dmadevice *dma = dc->dm_hwaddr; \
! 123: dma->dma_addr = (v_char *)dc->dm_chain[dc->dm_cur].dc_addr; \
! 124: dma->dma_count = dc->dm_chain[dc->dm_cur].dc_count - 1; \
! 125: dma->dma_cmd = dc->dm_cmd; \
! 126: }
! 127: #else
! 128: #define DMA_ARM(sc, dc) \
! 129: { \
! 130: struct dmadevice *dma = dc->dm_hwaddr; \
! 131: dma->dma_addr = (v_char *)dc->dm_chain[dc->dm_cur].dc_addr; \
! 132: dma->dma_count = dc->dm_chain[dc->dm_cur].dc_count - 1; \
! 133: dma->dma_cmd = dc->dm_cmd; \
! 134: }
! 135: #endif
! 136: #endif
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