84 lines
3.5 KiB
C
84 lines
3.5 KiB
C
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/* $NetBSD: am9516.h,v 1.1 1995/10/29 21:19:06 gwr Exp $ */
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/*
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* This file is derived from the file dev/devSCSI3.c from
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* the Berkeley SPRITE distribution, which says:
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*
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* Copyright 1988 Regents of the University of California
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* Permission to use, copy, modify, and distribute this
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* software and its documentation for any purpose and without
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* fee is hereby granted, provided that the above copyright
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* notice appear in all copies. The University of California
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* makes no representations about the suitability of this
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* software for any purpose. It is provided "as is" without
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* express or implied warranty.
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*/
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/*
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* AMD 9516 UDC (Universal DMA Controller) Registers.
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* This is used only in the OBIO version (3/50,3/60).
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*/
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/* addresses of the udc registers accessed directly by driver */
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#define UDC_ADR_MODE 0x38 /* master mode register */
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#define UDC_ADR_COMMAND 0x2e /* command register (write only) */
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#define UDC_ADR_STATUS 0x2e /* status register (read only) */
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#define UDC_ADR_CAR_HIGH 0x26 /* chain addr reg, high word */
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#define UDC_ADR_CAR_LOW 0x22 /* chain addr reg, low word */
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#define UDC_ADR_CARA_HIGH 0x1a /* cur addr reg A, high word */
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#define UDC_ADR_CARA_LOW 0x0a /* cur addr reg A, low word */
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#define UDC_ADR_CARB_HIGH 0x12 /* cur addr reg B, high word */
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#define UDC_ADR_CARB_LOW 0x02 /* cur addr reg B, low word */
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#define UDC_ADR_CMR_HIGH 0x56 /* channel mode reg, high word */
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#define UDC_ADR_CMR_LOW 0x52 /* channel mode reg, low word */
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#define UDC_ADR_COUNT 0x32 /* number of words to transfer */
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/*
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* For a dma transfer, the appropriate udc registers are loaded from a
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* table in memory pointed to by the chain address register.
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*/
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struct udc_table {
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u_short rsel; /* tells udc which regs to load */
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u_short addrh; /* high word of main mem dma address */
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u_short addrl; /* low word of main mem dma address */
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u_short count; /* num words to transfer */
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u_short cmrh; /* high word of channel mode reg */
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u_short cmrl; /* low word of channel mode reg */
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};
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/* indicates which udc registers are to be set based on info in above table */
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#define UDC_RSEL_RECV 0x0182
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#define UDC_RSEL_SEND 0x0282
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/* setting of chain mode reg: selects how the dma op is to be executed */
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#define UDC_CMR_HIGH 0x0040 /* high word of channel mode reg */
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#define UDC_CMR_LSEND 0x00c2 /* low word of cmr when send */
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#define UDC_CMR_LRECV 0x00d2 /* low word of cmr when receiving */
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/* setting for the master mode register */
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#define UDC_MODE 0xd /* enables udc chip */
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/* setting for the low byte in the high word of an address */
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#define UDC_ADDR_INFO 0x40 /* inc addr after each word is dma'd */
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/* udc commands */
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#define UDC_CMD_STRT_CHN 0xa0 /* start chaining */
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#define UDC_CMD_CIE 0x32 /* channel 1 interrupt enable */
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#define UDC_CMD_RESET 0x00 /* reset udc, same as hdw reset */
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/* bits in the udc status register */
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#define UDC_SR_CIE 0x8000 /* channel interrupt enable */
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#define UDC_SR_IP 0x2000 /* interrupt pending */
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#define UDC_SR_CA 0x1000 /* channel abort */
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#define UDC_SR_NAC 0x0800 /* no auto reload or chaining*/
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#define UDC_SR_WFB 0x0400 /* waiting for bus */
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#define UDC_SR_SIP 0x0200 /* second interrupt pending */
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#define UDC_SR_HM 0x0040 /* hardware mask */
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#define UDC_SR_HRQ 0x0020 /* hardware request */
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#define UDC_SR_MCH 0x0010 /* match on upper comparator byte */
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#define UDC_SR_MCL 0x0008 /* match on lower comparator byte */
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#define UDC_SR_MC 0x0004 /* match condition ended dma */
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#define UDC_SR_EOP 0x0002 /* eop condition ended dma */
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#define UDC_SR_TC 0x0001 /* termination of count ended dma */
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