/*
   * Trantor T128/T128F/T228 defines
   *	Note : architecturally, the T100 and T128 are different and won't work
   *
   * Copyright 1993, Drew Eckhardt
   *	Visionary Computing
   *	(Unix and Linux consulting and custom programming)
   *	drew@colorado.edu
   *      +1 (303) 440-4894
   *

   * DISTRIBUTION RELEASE 3.

   *

   * For more information, please consult

   *
   * Trantor Systems, Ltd.
   * T128/T128F/T228 SCSI Host Adapter
   * Hardware Specifications

   *
   * Trantor Systems, Ltd.

   * 5415 Randall Place
   * Fremont, CA 94538
   * 1+ (415) 770-1400, FAX 1+ (415) 770-9910

   *
   * and

   *
   * NCR 5380 Family
   * SCSI Protocol Controller
   * Databook
   *
   * NCR Microelectronics
   * 1635 Aeroplaza Drive
   * Colorado Springs, CO 80916
   * 1+ (719) 578-3400
   * 1+ (800) 334-5454
   */
  
  /*
   * $Log: t128.h,v $
   */
  
  #ifndef T128_H
  #define T128_H
  
  #define T128_PUBLIC_RELEASE 3

  #define TDEBUG		0

  #define TDEBUG_INIT	0x1
  #define TDEBUG_TRANSFER 0x2
  
  /*

   * The trantor boards are memory mapped. They use an NCR5380 or

   * equivalent (my sample board had part second sourced from ZILOG).

   * NCR's recommended "Pseudo-DMA" architecture is used, where

   * a PAL drives the DMA signals on the 5380 allowing fast, blind

   * transfers with proper handshaking.

   */
  
  /*

   * Note : a boot switch is provided for the purpose of informing the

   * firmware to boot or not boot from attached SCSI devices.  So, I imagine
   * there are fewer people who've yanked the ROM like they do on the Seagate
   * to make bootup faster, and I'll probably use this for autodetection.
   */
  #define T_ROM_OFFSET		0
  
  /*
   * Note : my sample board *WAS NOT* populated with the SRAM, so this
   * can't be used for autodetection without a ROM present.
   */
  #define T_RAM_OFFSET		0x1800
  
  /*
   * All of the registers are allocated 32 bytes of address space, except
   * for the data register (read/write to/from the 5380 in pseudo-DMA mode)
   */ 
  #define T_CONTROL_REG_OFFSET	0x1c00	/* rw */
  #define T_CR_INT		0x10	/* Enable interrupts */
  #define T_CR_CT			0x02	/* Reset watchdog timer */
  
  #define T_STATUS_REG_OFFSET	0x1c20	/* ro */
  #define T_ST_BOOT		0x80	/* Boot switch */
  #define T_ST_S3			0x40	/* User settable switches, */
  #define T_ST_S2			0x20	/* read 0 when switch is on, 1 off */
  #define T_ST_S1			0x10
  #define T_ST_PS2		0x08	/* Set for Microchannel 228 */
  #define T_ST_RDY		0x04	/* 5380 DRQ */
  #define T_ST_TIM		0x02	/* indicates 40us watchdog timer fired */
  #define T_ST_ZERO		0x01	/* Always zero */
  
  #define T_5380_OFFSET		0x1d00	/* 8 registers here, see NCR5380.h */
  
  #define T_DATA_REG_OFFSET	0x1e00	/* rw 512 bytes long */
  
  #ifndef ASM

  static int t128_abort(struct scsi_cmnd *);

  static int t128_biosparam(struct scsi_device *, struct block_device *,
  			  sector_t, int*);

  static int t128_detect(struct scsi_host_template *);

  static int t128_queue_command(struct Scsi_Host *, struct scsi_cmnd *);

  static int t128_bus_reset(struct scsi_cmnd *);

  
  #ifndef CMD_PER_LUN
  #define CMD_PER_LUN 2
  #endif
  
  #ifndef CAN_QUEUE

  #define CAN_QUEUE 32

  #endif
  
  #ifndef HOSTS_C
  
  #define NCR5380_implementation_fields \
      void __iomem *base
  
  #define NCR5380_local_declare() \
      void __iomem *base
  
  #define NCR5380_setup(instance) \
      base = ((struct NCR5380_hostdata *)(instance->hostdata))->base
  
  #define T128_address(reg) (base + T_5380_OFFSET + ((reg) * 0x20))

  #if !(TDEBUG & TDEBUG_TRANSFER)

  #define NCR5380_read(reg) readb(T128_address(reg))
  #define NCR5380_write(reg, value) writeb((value),(T128_address(reg)))
  #else
  #define NCR5380_read(reg)						\
      (((unsigned char) printk("scsi%d : read register %d at address %08x
  "\
      , instance->hostno, (reg), T128_address(reg))), readb(T128_address(reg)))
  
  #define NCR5380_write(reg, value) {					\

      printk("scsi%d : write %02x to register %d at address %08x
  ",	\

  	    instance->hostno, (value), (reg), T128_address(reg));	\
      writeb((value), (T128_address(reg)));				\
  }
  #endif
  
  #define NCR5380_intr t128_intr
  #define do_NCR5380_intr do_t128_intr
  #define NCR5380_queue_command t128_queue_command
  #define NCR5380_abort t128_abort

  #define NCR5380_bus_reset t128_bus_reset
  #define NCR5380_proc_info t128_proc_info

  /* 15 14 12 10 7 5 3

     1101 0100 1010 1000 */

  
  #define T128_IRQS 0xc4a8

  
  #endif /* else def HOSTS_C */
  #endif /* ndef ASM */
  #endif /* T128_H */