drivers/ide/ide_modes.h

   1 /*
   2  *  linux/drivers/ide/ide_modes.h
   3  *
   4  *  Copyright (C) 1996  Linus Torvalds, Igor Abramov, and Mark Lord
   5  */
   6
   7 #ifndef _IDE_MODES_H
   8 #define _IDE_MODES_H
   9
  10 #include <linux/config.h>
  11
  12 /*
  13  * Shared data/functions for determining best PIO mode for an IDE drive.
  14  * Most of this stuff originally lived in cmd640.c, and changes to the
  15  * ide_pio_blacklist[] table should be made with EXTREME CAUTION to avoid
  16  * breaking the fragile cmd640.c support.
  17  */
  18
  19 /*
  20  * Standard (generic) timings for PIO modes, from ATA2 specification.
  21  * These timings are for access to the IDE data port register *only*.
  22  * Some drives may specify a mode, while also specifying a different
  23  * value for cycle_time (from drive identification data).
  24  */
  25 typedef struct ide_pio_timings_s {
  26         int     setup_time;     /* Address setup (ns) minimum */
  27         int     active_time;    /* Active pulse (ns) minimum */
  28         int     cycle_time;     /* Cycle time (ns) minimum = (setup + active + recovery) */
  29 } ide_pio_timings_t;
  30
  31 typedef struct ide_pio_data_s {
  32         u8 pio_mode;
  33         u8 use_iordy;
  34         u8 overridden;
  35         u8 blacklisted;
  36         unsigned int cycle_time;
  37 } ide_pio_data_t;
  38
  39 u8 ide_get_best_pio_mode (ide_drive_t *drive, u8 mode_wanted, u8 max_mode, ide_pio_data_t *d);
  40 extern const ide_pio_timings_t ide_pio_timings[6];
  41 #endif /* _IDE_MODES_H */