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/* $OpenBSD: dmareg.h,v 1.9 2005/11/17 23:56:02 miod Exp $ */
/* $NetBSD: dmareg.h,v 1.12 1997/05/05 21:02:40 thorpej Exp $ */
/*
* Copyright (c) 1982, 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)dmareg.h 8.1 (Berkeley) 6/10/93
*/
#include <hp300/dev/iotypes.h> /* XXX */
/*
* Hardware layout for the 98620[ABC]:
* 98620A (old 320s?): byte/word DMA in up to 64K chunks
* 98620B (320s only): 98620A with programmable IPL
* 98620C (all others): byte/word/longword DMA in up to 4Gb chunks
*/
struct dmaBdevice {
v_char *dmaB_addr;
vu_short dmaB_count;
vu_short dmaB_cmd;
#define dmaB_stat dmaB_cmd
};
struct dmadevice {
v_char *dma_addr;
vu_int dma_count;
vu_short dma_cmd;
vu_short dma_stat;
};
struct dmareg {
struct dmaBdevice dma_Bchan0;
struct dmaBdevice dma_Bchan1;
/* the rest are 98620C specific */
v_char dma_id[4];
vu_char dma_cr;
char dma_pad1[0xEB];
struct dmadevice dma_chan0;
char dma_pad2[0xF4];
struct dmadevice dma_chan1;
};
/* The hp300 has 2 DMA channels. */
#define NDMACHAN 2
/* addresses */
#define DMA_BASE IIOV(0x500000)
/* command bits */
#define DMA_ENAB 0x0001
#define DMA_WORD 0x0002
#define DMA_WRT 0x0004
#define DMA_PRI 0x0008
#define DMA_IPL(x) (((x) - 3) << 4)
#define DMA_LWORD 0x0100
#define DMA_START 0x8000
/* status bits */
#define DMA_ARMED 0x01
#define DMA_INTR 0x02
#define DMA_ACC 0x04
#define DMA_HALT 0x08
#define DMA_BERR 0x10
#define DMA_ALIGN 0x20
#define DMA_WRAP 0x40
#ifdef _KERNEL
/*
* Macros to attempt to hide the HW differences between the 98620B DMA
* board and the 1TQ4-0401 DMA chip (68020C "board"). The latter
* includes emulation registers for the former but you need to access
* the "native-mode" registers directly in order to do 32-bit DMA.
*
* DMA_CLEAR: Clear interrupt on DMA board. We just use the
* emulation registers on the 98620C as that is easiest.
* DMA_STAT: Read status register. Again, we always read the
* emulation register. Someday we might want to
* look at the 98620C status to get the extended bits.
* DMA_ARM: Load address, count and kick-off DMA.
*/
#define DMA_CLEAR(dc) do { \
v_int dmaclr; \
dmaclr = (int)dc->dm_Bhwaddr->dmaB_addr; \
} while (0);
#define DMA_STAT(dc) dc->dm_Bhwaddr->dmaB_stat
#if defined(HP320)
#define DMA_ARM(sc, dc) \
if (sc->sc_type == DMA_B) { \
struct dmaBdevice *dma = dc->dm_Bhwaddr; \
dma->dmaB_addr = (v_char *)dc->dm_chain[dc->dm_cur].dc_addr; \
dma->dmaB_count = dc->dm_chain[dc->dm_cur].dc_count - 1; \
dma->dmaB_cmd = dc->dm_cmd; \
} else { \
struct dmadevice *dma = dc->dm_hwaddr; \
dma->dma_addr = (v_char *)dc->dm_chain[dc->dm_cur].dc_addr; \
dma->dma_count = dc->dm_chain[dc->dm_cur].dc_count - 1; \
dma->dma_cmd = dc->dm_cmd; \
}
#else
#define DMA_ARM(sc, dc) \
{ \
struct dmadevice *dma = dc->dm_hwaddr; \
dma->dma_addr = (v_char *)dc->dm_chain[dc->dm_cur].dc_addr; \
dma->dma_count = dc->dm_chain[dc->dm_cur].dc_count - 1; \
dma->dma_cmd = dc->dm_cmd; \
}
#endif
#endif
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