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/* $NetBSD: ncr5380reg.h,v 1.4 1995/11/30 00:58:54 jtc Exp $ */
/*
* Copyright (c) 1995 Leo Weppelman.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Leo Weppelman.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _NCR5380REG_H
#define _NCR5380REG_H
/*
* NCR5380 common interface definitions.
*/
/*
* Register numbers: (first argument to GET/SET_5380_REG )
*/
#define NCR5380_DATA 0 /* Data register */
#define NCR5380_ICOM 1 /* Initiator command register */
#define NCR5380_MODE 2 /* Mode register */
#define NCR5380_TCOM 3 /* Target command register */
#define NCR5380_IDSTAT 4 /* Bus status register */
#define NCR5380_DMSTAT 5 /* DMA status register */
#define NCR5380_TRCV 6 /* Target receive register */
#define NCR5380_IRCV 7 /* Initiator receive register */
/*
* Definitions for Initiator command register.
*/
#define SC_A_RST 0x80 /* RW - Assert RST */
#define SC_TEST 0x40 /* W - Test mode */
#define SC_AIP 0x40 /* R - Arbitration in progress */
#define SC_LA 0x20 /* R - Lost arbitration */
#define SC_A_ACK 0x10 /* RW - Assert ACK */
#define SC_A_BSY 0x08 /* RW - Assert BSY */
#define SC_A_SEL 0x04 /* RW - Assert SEL */
#define SC_A_ATN 0x02 /* RW - Assert ATN */
#define SC_ADTB 0x01 /* RW - Assert Data To Bus */
/*
* Definitions for mode register
*/
#define SC_B_DMA 0x80 /* RW - Block mode DMA (not on TT!) */
#define SC_T_MODE 0x40 /* RW - Target mode */
#define SC_E_PAR 0x20 /* RW - Enable parity check */
#define SC_E_PARI 0x10 /* RW - Enable parity interrupt */
#define SC_E_EOPI 0x08 /* RW - Enable End Of Process Interrupt */
#define SC_MON_BSY 0x04 /* RW - Monitor BSY */
#define SC_M_DMA 0x02 /* RW - Set DMA mode */
#define SC_ARBIT 0x01 /* RW - Arbitrate */
/*
* Definitions for tcom register
*/
#define SC_LBS 0x80 /* RW - Last Byte Send (not on TT!) */
#define SC_A_REQ 0x08 /* RW - Assert REQ */
#define SC_A_MSG 0x04 /* RW - Assert MSG */
#define SC_A_CD 0x02 /* RW - Assert C/D */
#define SC_A_IO 0x01 /* RW - Assert I/O */
/*
* Definitions for idstat register
*/
#define SC_S_RST 0x80 /* R - RST is set */
#define SC_S_BSY 0x40 /* R - BSY is set */
#define SC_S_REQ 0x20 /* R - REQ is set */
#define SC_S_MSG 0x10 /* R - MSG is set */
#define SC_S_CD 0x08 /* R - C/D is set */
#define SC_S_IO 0x04 /* R - I/O is set */
#define SC_S_SEL 0x02 /* R - SEL is set */
#define SC_S_PAR 0x01 /* R - Parity bit */
/*
* Definitions for dmastat register
*/
#define SC_END_DMA 0x80 /* R - End of DMA */
#define SC_DMA_REQ 0x40 /* R - DMA request */
#define SC_PAR_ERR 0x20 /* R - Parity error */
#define SC_IRQ_SET 0x10 /* R - IRQ is active */
#define SC_PHS_MTCH 0x08 /* R - Phase Match */
#define SC_BSY_ERR 0x04 /* R - Busy error */
#define SC_ATN_STAT 0x02 /* R - State of ATN line */
#define SC_ACK_STAT 0x01 /* R - State of ACK line */
#define SC_S_SEND 0x00 /* W - Start DMA output */
#define SC_CLINT { /* Clear interrupts */ \
int i = GET_5380_REG(NCR5380_IRCV); \
}
/*
* Definition of SCSI-bus phases. The values are determined by signals
* on the SCSI-bus. DO NOT CHANGE!
* The values must be used to index the pointers in SCSI-PARMS.
*/
#define NR_PHASE 8
#define PH_DATAOUT 0
#define PH_DATAIN 1
#define PH_CMD 2
#define PH_STATUS 3
#define PH_RES1 4
#define PH_RES2 5
#define PH_MSGOUT 6
#define PH_MSGIN 7
#define PH_OUT(phase) (!(phase & 1)) /* TRUE if output phase */
#define PH_IN(phase) (phase & 1) /* TRUE if input phase */
/*
* Id of Host-adapter
*/
#define SC_HOST_ID 0x80
/*
* Base setting for 5380 mode register
*/
#define IMODE_BASE SC_E_PAR
/*
* SCSI completion status codes, should move to sys/scsi/????
*/
#define SCSMASK 0x1e /* status code mask */
#define SCSGOOD 0x00 /* good status */
#define SCSCHKC 0x02 /* check condition */
#define SCSBUSY 0x08 /* busy status */
#define SCSCMET 0x04 /* condition met / good */
/*
* Return values of check_intr()
*/
#define INTR_SPURIOUS 0
#define INTR_RESEL 2
#define INTR_DMA 3
struct ncr_softc {
struct device sc_dev;
struct scsi_link sc_link;
/*
* Some (pre-SCSI2) devices don't support select with ATN.
* If the device responds to select with ATN by going into
* command phase (ignoring ATN), then we flag it in the
* following bitmask.
* We also keep track of which devices have been selected
* before. This allows us to not even try raising ATN if
* the target doesn't respond to it the first time.
*/
u_int8_t sc_noselatn;
u_int8_t sc_selected;
};
/*
* Max. number of dma-chains per request
*/
#define MAXDMAIO (MAXPHYS/NBPG + 1)
/*
* Some requests are not contiguous in physical memory. We need to break them
* up into contiguous parts for DMA.
*/
struct dma_chain {
u_int dm_count;
u_long dm_addr;
};
/*
* Define our issue, free and disconnect queue's.
*/
typedef struct req_q {
struct req_q *next; /* next in free, issue or discon queue */
struct req_q *link; /* next linked command to execute */
struct scsi_xfer *xs; /* request from high-level driver */
u_short dr_flag; /* driver state */
u_char phase; /* current SCSI phase */
u_char msgout; /* message to send when requested */
u_char targ_id; /* target for command */
u_char targ_lun; /* lun for command */
u_char status; /* returned status byte */
u_char message; /* returned message byte */
u_char *bounceb; /* allocated bounce buffer */
u_char *bouncerp; /* bounce read-pointer */
struct dma_chain dm_chain[MAXDMAIO];
struct dma_chain *dm_cur; /* current dma-request */
struct dma_chain *dm_last; /* last dma-request */
long xdata_len; /* length of transfer */
u_char *xdata_ptr; /* virtual address of transfer */
struct scsi_generic xcmd; /* command to execute */
} SC_REQ;
/*
* Values for dr_flag:
*/
#define DRIVER_IN_DMA 0x01 /* Non-polled DMA activated */
#define DRIVER_AUTOSEN 0x02 /* Doing automatic sense */
#define DRIVER_NOINT 0x04 /* We are booting: no interrupts */
#define DRIVER_DMAOK 0x08 /* DMA can be used on this request */
#define DRIVER_BOUNCING 0x10 /* Using the bounce buffer */
/* XXX: Should go to ncr5380var.h */
static SC_REQ *issue_q = NULL; /* Commands waiting to be issued*/
static SC_REQ *discon_q = NULL; /* Commands disconnected */
static SC_REQ *connected = NULL; /* Command currently connected */
/*
* Function decls:
*/
static int transfer_pio __P((u_char *, u_char *, u_long *, int));
static int wait_req_true __P((void));
static int wait_req_false __P((void));
static int scsi_select __P((SC_REQ *, int));
static int handle_message __P((SC_REQ *, u_int));
static void ack_message __P((void));
static void nack_message __P((SC_REQ *, u_char));
static int information_transfer __P((void));
static void reselect __P((struct ncr_softc *));
static int dma_ready __P((void));
static void transfer_dma __P((SC_REQ *, u_int, int));
static int check_autosense __P((SC_REQ *, int));
static int reach_msg_out __P((struct ncr_softc *, u_long));
static int check_intr __P((struct ncr_softc *));
static void scsi_reset __P((struct ncr_softc *));
static int scsi_dmaok __P((SC_REQ *));
static void run_main __P((struct ncr_softc *));
static void scsi_main __P((struct ncr_softc *));
static void ncr_ctrl_intr __P((struct ncr_softc *));
static void ncr_dma_intr __P((struct ncr_softc *));
static void ncr_tprint __P((SC_REQ *, char *, ...));
static void ncr_aprint __P((struct ncr_softc *, char *, ...));
static void show_request __P((SC_REQ *, char *));
static void show_phase __P((SC_REQ *, int));
static void show_signals __P((u_char, u_char));
#endif /* _NCR5380REG_H */
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