1 /* blz1230.h: Defines and structures for the Blizzard 1230 SCSI IV driver.
3 * Copyright (C) 1996 Jesper Skov (jskov@cygnus.co.uk)
5 * This file is based on cyber_esp.h (hence the occasional reference to
14 /* The controller registers can be found in the Z2 config area at these
17 #define BLZ1230_ESP_ADDR 0x8000
18 #define BLZ1230_DMA_ADDR 0x10000
19 #define BLZ1230II_ESP_ADDR 0x10000
20 #define BLZ1230II_DMA_ADDR 0x10021
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
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.
34 * Figure out interrupt status by reading the ESP status byte.
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] */
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] */
48 #define BLZ1230_DMA_WRITE 0x80000000
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
);
60 #define SCSI_BLZ1230 { proc_name: "esp-blz1230", \
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, \
71 sg_tablesize: SG_ALL, \
73 use_clustering: ENABLE_CLUSTERING }
75 #endif /* BLZ1230_H */