/* * Copyright (c) 1982, 1990 The Regents of the University of California. * All rights reserved. * * Redistribution is only permitted until one year after the first shipment * of 4.4BSD by the Regents. Otherwise, redistribution and use in source and * binary forms are permitted provided that: (1) source distributions retain * this entire copyright notice and comment, and (2) distributions including * binaries display the following acknowledgement: This product includes * software developed by the University of California, Berkeley and its * contributors'' in the documentation or other materials provided with the * distribution and in all advertising materials mentioning features or use * of this software. 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 AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. * * @(#)dmareg.h 7.1 (Berkeley) 5/8/90 */ /* * 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 */ #define v_char volatile char #define v_int volatile int #define vu_char volatile u_char #define vu_short volatile u_short #define vu_int volatile u_int 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; }; #define NDMA 2 /* intr level must be >= level of any device using dma. i.e., splbio */ #define DMAINTLVL 5 /* addresses */ #define DMA_BASE IOV(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) { v_int dmaclr = (int)dc->sc_Bhwaddr->dmaB_addr; } #define DMA_STAT(dc) dc->sc_Bhwaddr->dmaB_stat #if defined(HP320) #define DMA_ARM(dc, ix) \ if (dc->sc_type == DMA_B) { \ register struct dmaBdevice *dma = dc->sc_Bhwaddr; \ dma->dmaB_addr = dc->sc_addr[ix]; \ dma->dmaB_count = dc->sc_count[ix] - 1; \ dma->dmaB_cmd = dc->sc_cmd; \ } else { \ register struct dmadevice *dma = dc->sc_hwaddr; \ dma->dma_addr = dc->sc_addr[ix]; \ dma->dma_count = dc->sc_count[ix] - 1; \ dma->dma_cmd = dc->sc_cmd; \ } #else #define DMA_ARM(dc, ix) \ { \ register struct dmadevice *dma = dc->sc_hwaddr; \ dma->dma_addr = dc->sc_addr[ix]; \ dma->dma_count = dc->sc_count[ix] - 1; \ dma->dma_cmd = dc->sc_cmd; \ } #endif #endif