drivers/scsi/blz1230.h

   1 /* blz1230.h: Defines and structures for the Blizzard 1230 SCSI IV driver.
   2  *
   3  * Copyright (C) 1996 Jesper Skov (jskov@cygnus.co.uk)
   4  *
   5  * This file is based on cyber_esp.h (hence the occasional reference to
   6  * CyberStorm).
   7  */
   8
   9 #include "NCR53C9x.h"
  10
  11 #ifndef BLZ1230_H
  12 #define BLZ1230_H
  13
  14 /* The controller registers can be found in the Z2 config area at these
  15  * offsets:
  16  */
  17 #define BLZ1230_ESP_ADDR 0x8000
  18 #define BLZ1230_DMA_ADDR 0x10000
  19 #define BLZ1230II_ESP_ADDR 0x10000
  20 #define BLZ1230II_DMA_ADDR 0x10021
  21
  22
  23 /* The Blizzard 1230 DMA interface
  24  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  25  * Only two things can be programmed in the Blizzard DMA:
  26  *  1) The data direction is controlled by the status of bit 31 (1 = write)
  27  *  2) The source/dest address (word aligned, shifted one right) in bits 30-0
  28  *
  29  * Program DMA by first latching the highest byte of the address/direction
  30  * (i.e. bits 31-24 of the long word constructed as described in steps 1+2
  31  * above). Then write each byte of the address/direction (starting with the
  32  * top byte, working down) to the DMA address register.
  33  *
  34  * Figure out interrupt status by reading the ESP status byte.
  35  */
  36 struct blz1230_dma_registers {
  37         volatile unsigned char dma_addr;        /* DMA address      [0x0000] */
  38         unsigned char dmapad2[0x7fff];
  39         volatile unsigned char dma_latch;       /* DMA latch        [0x8000] */
  40 };
  41
  42 struct blz1230II_dma_registers {
  43         volatile unsigned char dma_addr;        /* DMA address      [0x0000] */
  44         unsigned char dmapad2[0xf];
  45         volatile unsigned char dma_latch;       /* DMA latch        [0x0010] */
  46 };
  47
  48 #define BLZ1230_DMA_WRITE 0x80000000
  49
  50 extern int blz1230_esp_detect(struct SHT *);
  51 extern int blz1230_esp_release(struct Scsi_Host *);
  52 extern const char *esp_info(struct Scsi_Host *);
  53 extern int esp_queue(Scsi_Cmnd *, void (*done)(Scsi_Cmnd *));
  54 extern int esp_command(Scsi_Cmnd *);
  55 extern int esp_abort(Scsi_Cmnd *);
  56 extern int esp_reset(Scsi_Cmnd *, unsigned int);
  57 extern int esp_proc_info(char *buffer, char **start, off_t offset, int length,
  58                          int hostno, int inout);
  59
  60 #define SCSI_BLZ1230      { proc_dir:           &proc_scsi_esp, \
  61                             proc_info:          esp_proc_info, \
  62                             name:               "Blizzard1230 SCSI IV", \
  63                             detect:             blz1230_esp_detect, \
  64                             release:            blz1230_esp_release, \
  65                             command:            esp_command, \
  66                             queuecommand:       esp_queue, \
  67                             abort:              esp_abort, \
  68                             reset:              esp_reset, \
  69                             can_queue:          7, \
  70                             this_id:            7, \
  71                             sg_tablesize:       SG_ALL, \
  72                             cmd_per_lun:        1, \
  73                             use_clustering:     ENABLE_CLUSTERING }
  74
  75 #endif /* BLZ1230_H */