/* $NetBSD: ncr5380reg.h,v 1.7 2005/12/11 12:21:28 christos Exp $ */

/* $NetBSD: ncr5380reg.h,v 1.7 2005/12/11 12:21:28 christos Exp $ */

/*
* Mach Operating System
* Copyright (c) 1991,1990,1989 Carnegie Mellon University
* All Rights Reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or [email protected]
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*/
/*
* HISTORY (mach3)
* Revision 2.3 91/08/24 12:25:10 af
* Moved padding of regmap in impl file.
* [91/08/02 04:22:39 af]
*
* Revision 2.2 91/06/19 16:28:35 rvb
* From the NCR data sheets
* "NCR 5380 Family, SCSI Protocol Controller Data Manual"
* NCR Microelectronics Division, Colorado Spring, 6/98 T01891L
* [91/04/21 af]
*
*/

/*
* File: scsi_5380.h
* Author: Alessandro Forin, Carnegie Mellon University
* Date: 5/91
*
* Defines for the NCR 5380 (SCSI chip), aka Am5380
*/

/*
* Register map: Note not declared here anymore!
* All the 5380 registers are accessed through individual
* pointers initialized by MD code. This allows the 5380
* MI functions to be shared between MD drivers that have
* different padding between the registers (i.e. amiga).
*/
#if 0 /* example only */
struct ncr5380regs {
volatile u_char sci_r0;
volatile u_char sci_r1;
volatile u_char sci_r2;
volatile u_char sci_r3;
volatile u_char sci_r4;
volatile u_char sci_r5;
volatile u_char sci_r6;
volatile u_char sci_r7;
};
#endif

/*
* Machine-independent code uses these names:
*/
#define sci_data sci_r0 /* r: Current data */
#define sci_odata sci_r0 /* w: Out data */

#define sci_icmd sci_r1 /* rw: Initiator command */
#define sci_mode sci_r2 /* rw: Mode */
#define sci_tcmd sci_r3 /* rw: Target command */

#define sci_bus_csr sci_r4 /* r: Bus Status */
#define sci_sel_enb sci_r4 /* w: Select enable */

#define sci_csr sci_r5 /* r: Status */
#define sci_dma_send sci_r5 /* w: Start DMA send data */

#define sci_idata sci_r6 /* r: Input data */
#define sci_trecv sci_r6 /* w: Start DMA receive, target */

#define sci_iack sci_r7 /* r: Interrupt Acknowledge */
#define sci_irecv sci_r7 /* w: Start DMA receive, initiator */

/*
* R1: Initiator command register
*/
#define SCI_ICMD_DATA 0x01 /* rw: Assert data bus */
#define SCI_ICMD_ATN 0x02 /* rw: Assert ATN signal */
#define SCI_ICMD_SEL 0x04 /* rw: Assert SEL signal */
#define SCI_ICMD_BSY 0x08 /* rw: Assert BSY signal */
#define SCI_ICMD_ACK 0x10 /* rw: Assert ACK signal */
#define SCI_ICMD_LST 0x20 /* r: Lost arbitration */
#define SCI_ICMD_DIFF SCI_ICMD_LST /* w: Differential cable */
#define SCI_ICMD_AIP 0x40 /* r: Arbitration in progress */
#define SCI_ICMD_TEST SCI_ICMD_AIP /* w: Test mode */
#define SCI_ICMD_RST 0x80 /* rw: Assert RST signal */
/* Bits to keep when doing read/modify/write (leave out RST) */
#define SCI_ICMD_RMASK 0x1F

/*
* R2: Mode register
*/
#define SCI_MODE_ARB 0x01 /* rw: Start arbitration */
#define SCI_MODE_DMA 0x02 /* rw: Enable DMA xfers */
#define SCI_MODE_MONBSY 0x04 /* rw: Monitor BSY signal */
#define SCI_MODE_DMA_IE 0x08 /* rw: Enable DMA complete interrupt */
#define SCI_MODE_PERR_IE 0x10 /* rw: Interrupt on parity errors */
#define SCI_MODE_PAR_CHK 0x20 /* rw: Check parity */
#define SCI_MODE_TARGET 0x40 /* rw: Target mode (Initiator if 0) */
#define SCI_MODE_BLOCKDMA 0x80 /* rw: Block-mode DMA handshake */

/*
* R3: Target command register
*/
#define SCI_TCMD_IO 0x01 /* rw: Assert I/O signal */
#define SCI_TCMD_CD 0x02 /* rw: Assert C/D signal */
#define SCI_TCMD_MSG 0x04 /* rw: Assert MSG signal */
#define SCI_TCMD_PHASE_MASK 0x07 /* r: Mask for current bus phase */
#define SCI_TCMD_REQ 0x08 /* rw: Assert REQ signal */
#define SCI_TCMD_LAST_SENT 0x80 /* ro: Last byte was xferred
* (not on 5380/1) */

#define SCI_TCMD_PHASE(x) ((x) & 0x7)

/*
* R4: Current (SCSI) Bus status (.sci_bus_csr)
*/
#define SCI_BUS_DBP 0x01 /* r: Data Bus parity */
#define SCI_BUS_SEL 0x02 /* r: SEL signal */
#define SCI_BUS_IO 0x04 /* r: I/O signal */
#define SCI_BUS_CD 0x08 /* r: C/D signal */
#define SCI_BUS_MSG 0x10 /* r: MSG signal */
#define SCI_BUS_REQ 0x20 /* r: REQ signal */
#define SCI_BUS_BSY 0x40 /* r: BSY signal */
#define SCI_BUS_RST 0x80 /* r: RST signal */

#define SCI_BUS_PHASE(x) (((x) >> 2) & 7)

/*
* R5: Bus and Status register (.sci_csr)
*/
#define SCI_CSR_ACK 0x01 /* r: ACK signal */
#define SCI_CSR_ATN 0x02 /* r: ATN signal */
#define SCI_CSR_DISC 0x04 /* r: Disconnected (BSY==0) */
#define SCI_CSR_PHASE_MATCH 0x08 /* r: Bus and SCI_TCMD match */
#define SCI_CSR_INT 0x10 /* r: Interrupt request */
#define SCI_CSR_PERR 0x20 /* r: Parity error */
#define SCI_CSR_DREQ 0x40 /* r: DMA request */
#define SCI_CSR_DONE 0x80 /* r: DMA count is zero */