104 lines
3.9 KiB
C
104 lines
3.9 KiB
C
/* $NetBSD: ncr_sireg.h,v 1.2 1995/11/17 23:27:55 gwr Exp $ */
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/*
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* Register map for the Sun3 SCSI Interface (si)
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* The first part of this register map is an NCR5380
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* SCSI Bus Interface Controller (SBIC). The rest is a
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* DMA controller and custom logic in one of two flavors,
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* one for the OBIO interface (3/50,3/60) and one for the
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* VME interface (3/160,3/260,etc.), where some registers
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* are implemented only on one or the other, some on both.
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*/
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/*
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* Some of these registers apply to only one interface and some
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* apply to both. The registers which apply to the Sun3/50 onboard
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* version only are udc_rdata and udc_raddr. The registers which
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* apply to the Sun3 vme version only are dma_addr, dma_count, bpr,
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* iv_am, and bcrh. Thus, the sbc registers, fifo_data, bcr, and csr
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* apply to both interfaces.
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* One other feature of the vme interface: a write to the dma count
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* register also causes a write to the fifo byte count register and
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* vis versa.
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*/
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/*
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* Am5380 Register map (no padding)
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*/
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struct ncr5380regs {
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volatile u_char sci_r0;
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volatile u_char sci_r1;
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volatile u_char sci_r2;
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volatile u_char sci_r3;
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volatile u_char sci_r4;
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volatile u_char sci_r5;
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volatile u_char sci_r6;
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volatile u_char sci_r7;
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};
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struct si_regs {
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struct ncr5380regs sci;
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/* DMA controller registers */
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u_short dma_addrh; /* dma address (VME only) */
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u_short dma_addrl; /* (high word, low word) */
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u_short dma_counth; /* dma count (VME only) */
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u_short dma_countl; /* (high word, low word) */
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/* AMD 9516 regs (OBIO only) see am9516.h */
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u_short udc_data; /* Am9516, reg data (OBIO only) */
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u_short udc_addr; /* Am9516, reg addr (OBIO only) */
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/* These three registers are on both OBIO and VME versions. */
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u_short fifo_data; /* fifo data register */
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/* holds extra byte on odd */
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/* byte dma read */
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u_short fifo_count; /* fifo byte count */
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u_short si_csr; /* control/status register */
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/* The rest of these are on the VME interface only: */
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u_short si_bprh; /* byte pack, high (VME only) */
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u_short si_bprl; /* byte pack, low (VME only) */
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u_short si_iv_am; /* bits 0-7: intr vector */
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/* bits 8-13: addr modifier (VME only) */
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/* bits 14-15: unused */
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u_short fifo_cnt_hi; /* high part of fifo_count (VME only) */
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/* Whole thing repeats after 32 bytes. */
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u_short _space[3];
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};
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/* possible values for the address modifier, sun3 vme version only */
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#define VME_SUPV_DATA_24 0x3d00
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/*
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* Status Register.
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* Note:
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* (r) indicates bit is read only.
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* (rw) indicates bit is read or write.
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* (v) vme host adaptor interface only.
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* (o) sun3/50 onboard host adaptor interface only.
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* (b) both vme and sun3/50 host adaptor interfaces.
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*/
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#define SI_CSR_DMA_ACTIVE 0x8000 /* (r,o) dma transfer active */
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#define SI_CSR_DMA_CONFLICT 0x4000 /* (r,b) reg accessed while dmaing */
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#define SI_CSR_DMA_BUS_ERR 0x2000 /* (r,b) bus error during dma */
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#define SI_CSR_ID 0x1000 /* (r,b) 0 for 3/50, 1 for SCSI-3, */
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/* 0 if SCSI-3 unmodified */
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#define SI_CSR_FIFO_FULL 0x0800 /* (r,b) fifo full */
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#define SI_CSR_FIFO_EMPTY 0x0400 /* (r,b) fifo empty */
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#define SI_CSR_SBC_IP 0x0200 /* (r,b) sbc interrupt pending */
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#define SI_CSR_DMA_IP 0x0100 /* (r,b) dma interrupt pending */
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#define SI_CSR_LOB 0x00c0 /* (r,v) number of leftover bytes */
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#define SI_CSR_LOB_THREE 0x00c0 /* (r,v) three leftover bytes */
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#define SI_CSR_LOB_TWO 0x0080 /* (r,v) two leftover bytes */
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#define SI_CSR_LOB_ONE 0x0040 /* (r,v) one leftover byte */
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#define SI_CSR_BPCON 0x0020 /* (rw,v) byte packing control */
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/* dma is in 0=longwords, 1=words */
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#define SI_CSR_DMA_EN 0x0010 /* (rw,v) dma/interrupt enable */
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#define SI_CSR_SEND 0x0008 /* (rw,b) dma dir, 1=to device */
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#define SI_CSR_INTR_EN 0x0004 /* (rw,b) interrupts enable */
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#define SI_CSR_FIFO_RES 0x0002 /* (rw,b) inits fifo, 0=reset */
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#define SI_CSR_SCSI_RES 0x0001 /* (rw,b) reset sbc and udc, 0=reset */
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