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/*
* mac53c94.h: definitions for the driver for the 53c94 SCSI bus adaptor
* found on Power Macintosh computers, controlling the external SCSI chain.
*
* Copyright (C) 1996 Paul Mackerras.
*/
#ifndef _MAC53C94_H
#define _MAC53C94_H
/*
* Registers in the 53C94 controller.
*/
struct mac53c94_regs {
unsigned char count_lo;
char pad0[15];
unsigned char count_mid;
char pad1[15];
unsigned char fifo;
char pad2[15];
unsigned char command;
char pad3[15];
unsigned char status;
char pad4[15];
unsigned char interrupt;
char pad5[15];
unsigned char seqstep;
char pad6[15];
unsigned char flags;
char pad7[15];
unsigned char config1;
char pad8[15];
unsigned char clk_factor;
char pad9[15];
unsigned char test;
char pad10[15];
unsigned char config2;
char pad11[15];
unsigned char config3;
char pad12[15];
unsigned char config4;
char pad13[15];
unsigned char count_hi;
char pad14[15];
unsigned char fifo_res;
char pad15[15];
};
/*
* Alternate functions for some registers.
*/
#define dest_id status
#define sel_timeout interrupt
#define sync_period seqstep
#define sync_offset flags
/*
* Bits in command register.
*/
#define CMD_DMA_MODE 0x80
#define CMD_MODE_MASK 0x70
#define CMD_MODE_INIT 0x10
#define CMD_MODE_TARG 0x20
#define CMD_MODE_DISC 0x40
#define CMD_NOP 0
#define CMD_FLUSH 1
#define CMD_RESET 2
#define CMD_SCSI_RESET 3
#define CMD_XFER_DATA 0x10
#define CMD_I_COMPLETE 0x11
#define CMD_ACCEPT_MSG 0x12
#define CMD_XFER_PAD 0x18
#define CMD_SET_ATN 0x1a
#define CMD_CLR_ATN 0x1b
#define CMD_SEND_MSG 0x20
#define CMD_SEND_STATUS 0x21
#define CMD_SEND_DATA 0x22
#define CMD_DISC_SEQ 0x23
#define CMD_TERMINATE 0x24
#define CMD_T_COMPLETE 0x25
#define CMD_DISCONNECT 0x27
#define CMD_RECV_MSG 0x28
#define CMD_RECV_CDB 0x29
#define CMD_RECV_DATA 0x2a
#define CMD_RECV_CMD 0x2b
#define CMD_ABORT_DMA 0x04
#define CMD_RESELECT 0x40
#define CMD_SELECT 0x41
#define CMD_SELECT_ATN 0x42
#define CMD_SELATN_STOP 0x43
#define CMD_ENABLE_SEL 0x44
#define CMD_DISABLE_SEL 0x45
#define CMD_SEL_ATN3 0x46
#define CMD_RESEL_ATN3 0x47
/*
* Bits in status register.
*/
#define STAT_IRQ 0x80
#define STAT_ERROR 0x40
#define STAT_PARITY 0x20
#define STAT_TC_ZERO 0x10
#define STAT_DONE 0x08
#define STAT_PHASE 0x07
#define STAT_MSG 0x04
#define STAT_CD 0x02
#define STAT_IO 0x01
/*
* Bits in interrupt register.
*/
#define INTR_RESET 0x80 /* SCSI bus was reset */
#define INTR_ILL_CMD 0x40 /* illegal command */
#define INTR_DISCONNECT 0x20 /* we got disconnected */
#define INTR_BUS_SERV 0x10 /* bus service requested */
#define INTR_DONE 0x08 /* function completed */
#define INTR_RESELECTED 0x04 /* we were reselected */
#define INTR_SEL_ATN 0x02 /* we were selected, ATN asserted */
#define INTR_SELECT 0x01 /* we were selected, ATN negated */
/*
* Encoding for the select timeout.
*/
#define TIMO_VAL(x) ((x) * 5000 / 7682)
/*
* Bits in sequence step register.
*/
#define SS_MASK 7
#define SS_ARB_SEL 0 /* Selection & arbitration complete */
#define SS_MSG_SENT 1 /* One message byte sent */
#define SS_NOT_CMD 2 /* Not in command phase */
#define SS_PHASE_CHG 3 /* Early phase change, cmd bytes lost */
#define SS_DONE 4 /* Command was sent OK */
/*
* Encoding for sync transfer period.
*/
#define SYNCP_MASK 0x1f
#define SYNCP_MIN 4
#define SYNCP_MAX 31
/*
* Bits in flags register.
*/
#define FLAGS_FIFO_LEV 0x1f
#define FLAGS_SEQ_STEP 0xe0
/*
* Encoding for sync offset.
*/
#define SYNCO_MASK 0x0f
#define SYNCO_ASS_CTRL 0x30 /* REQ/ACK assertion control */
#define SYNCO_NEG_CTRL 0xc0 /* REQ/ACK negation control */
/*
* Bits in config1 register.
*/
#define CF1_SLOW_CABLE 0x80 /* Slow cable mode */
#define CF1_NO_RES_REP 0x40 /* Disable SCSI reset reports */
#define CF1_PAR_TEST 0x20 /* Parity test mode enable */
#define CF1_PAR_ENABLE 0x10 /* Enable parity checks */
#define CF1_TEST 0x08 /* Chip tests */
#define CF1_MY_ID 0x07 /* Controller's address on bus */
/*
* Encoding for clk_factor register.
*/
#define CLKF_MASK 7
#define CLKF_VAL(freq) ((((freq) + 4999999) / 5000000) & CLKF_MASK)
/*
* Bits in test mode register.
*/
#define TEST_TARGET 1 /* target test mode */
#define TEST_INITIATOR 2 /* initiator test mode */
#define TEST_TRISTATE 4 /* tristate (hi-z) test mode */
/*
* Bits in config2 register.
*/
#define CF2_RFB 0x80
#define CF2_FEATURE_EN 0x40 /* enable features / phase latch */
#define CF2_BYTECTRL 0x20
#define CF2_DREQ_HIZ 0x10
#define CF2_SCSI2 0x08
#define CF2_PAR_ABORT 0x04 /* bad parity target abort */
#define CF2_REG_PARERR 0x02 /* register parity error */
#define CF2_DMA_PARERR 0x01 /* DMA parity error */
/*
* Bits in the config3 register.
*/
#define CF3_ID_MSG_CHK 0x80
#define CF3_3B_MSGS 0x40
#define CF3_CDB10 0x20
#define CF3_FASTSCSI 0x10 /* enable fast SCSI support */
#define CF3_FASTCLOCK 0x08
#define CF3_SAVERESID 0x04
#define CF3_ALT_DMA 0x02
#define CF3_THRESH_8 0x01
/*
* Bits in the config4 register.
*/
#define CF4_EAN 0x04
#define CF4_TEST 0x02
#define CF4_BBTE 0x01
#endif /* _MAC53C94_H */
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