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/*
* linux/drivers/ide/ide_modes.h
*
* Copyright (C) 1996 Linus Torvalds, Igor Abramov, and Mark Lord
*/
#ifndef _IDE_MODES_H
#define _IDE_MODES_H
#include <linux/config.h>
/*
* Shared data/functions for determining best PIO mode for an IDE drive.
* Most of this stuff originally lived in cmd640.c, and changes to the
* ide_pio_blacklist[] table should be made with EXTREME CAUTION to avoid
* breaking the fragile cmd640.c support.
*/
#ifdef CONFIG_BLK_DEV_IDE_MODES
/*
* Standard (generic) timings for PIO modes, from ATA2 specification.
* These timings are for access to the IDE data port register *only*.
* Some drives may specify a mode, while also specifying a different
* value for cycle_time (from drive identification data).
*/
typedef struct ide_pio_timings_s {
int setup_time; /* Address setup (ns) minimum */
int active_time; /* Active pulse (ns) minimum */
int cycle_time; /* Cycle time (ns) minimum = (setup + active + recovery) */
} ide_pio_timings_t;
typedef struct ide_pio_data_s {
byte pio_mode;
byte use_iordy;
byte overridden;
byte blacklisted;
unsigned int cycle_time;
} ide_pio_data_t;
#ifndef _IDE_C
int ide_scan_pio_blacklist (char *model);
byte ide_get_best_pio_mode (ide_drive_t *drive, byte mode_wanted, byte max_mode, ide_pio_data_t *d);
extern const ide_pio_timings_t ide_pio_timings[6];
#else /* _IDE_C */
const ide_pio_timings_t ide_pio_timings[6] = {
{ 70, 165, 600 }, /* PIO Mode 0 */
{ 50, 125, 383 }, /* PIO Mode 1 */
{ 30, 100, 240 }, /* PIO Mode 2 */
{ 30, 80, 180 }, /* PIO Mode 3 with IORDY */
{ 25, 70, 120 }, /* PIO Mode 4 with IORDY */
{ 20, 50, 100 } /* PIO Mode 5 with IORDY (nonstandard) */
};
/*
* Black list. Some drives incorrectly report their maximal PIO mode,
* at least in respect to CMD640. Here we keep info on some known drives.
*/
static struct ide_pio_info {
const char *name;
int pio;
} ide_pio_blacklist [] = {
/* { "Conner Peripherals 1275MB - CFS1275A", 4 }, */
{ "Conner Peripherals 540MB - CFS540A", 3 },
{ "WDC AC2700", 3 },
{ "WDC AC2540", 3 },
{ "WDC AC2420", 3 },
{ "WDC AC2340", 3 },
{ "WDC AC2250", 0 },
{ "WDC AC2200", 0 },
{ "WDC AC21200", 4 },
{ "WDC AC2120", 0 },
{ "WDC AC2850", 3 },
{ "WDC AC1270", 3 },
{ "WDC AC1170", 1 },
{ "WDC AC1210", 1 },
{ "WDC AC280", 0 },
/* { "WDC AC21000", 4 }, */
{ "WDC AC31000", 3 },
{ "WDC AC31200", 3 },
/* { "WDC AC31600", 4 }, */
{ "Maxtor 7131 AT", 1 },
{ "Maxtor 7171 AT", 1 },
{ "Maxtor 7213 AT", 1 },
{ "Maxtor 7245 AT", 1 },
{ "Maxtor 7345 AT", 1 },
{ "Maxtor 7546 AT", 3 },
{ "Maxtor 7540 AV", 3 },
{ "SAMSUNG SHD-3121A", 1 },
{ "SAMSUNG SHD-3122A", 1 },
{ "SAMSUNG SHD-3172A", 1 },
/* { "ST51080A", 4 },
* { "ST51270A", 4 },
* { "ST31220A", 4 },
* { "ST31640A", 4 },
* { "ST32140A", 4 },
* { "ST3780A", 4 },
*/
{ "ST5660A", 3 },
{ "ST3660A", 3 },
{ "ST3630A", 3 },
{ "ST3655A", 3 },
{ "ST3391A", 3 },
{ "ST3390A", 1 },
{ "ST3600A", 1 },
{ "ST3290A", 0 },
{ "ST3144A", 0 },
{ "ST3491A", 1 }, /* reports 3, should be 1 or 2 (depending on */
/* drive) according to Seagates FIND-ATA program */
{ "QUANTUM ELS127A", 0 },
{ "QUANTUM ELS170A", 0 },
{ "QUANTUM LPS240A", 0 },
{ "QUANTUM LPS210A", 3 },
{ "QUANTUM LPS270A", 3 },
{ "QUANTUM LPS365A", 3 },
{ "QUANTUM LPS540A", 3 },
{ "QUANTUM LIGHTNING 540A", 3 },
{ "QUANTUM LIGHTNING 730A", 3 },
{ "QUANTUM FIREBALL_540", 3 }, /* Older Quantum Fireballs don't work */
{ "QUANTUM FIREBALL_640", 3 },
{ "QUANTUM FIREBALL_1080", 3 },
{ "QUANTUM FIREBALL_1280", 3 },
{ NULL, 0 }
};
/*
* This routine searches the ide_pio_blacklist for an entry
* matching the start/whole of the supplied model name.
*
* Returns -1 if no match found.
* Otherwise returns the recommended PIO mode from ide_pio_blacklist[].
*/
int ide_scan_pio_blacklist (char *model)
{
struct ide_pio_info *p;
for (p = ide_pio_blacklist; p->name != NULL; p++) {
if (strncmp(p->name, model, strlen(p->name)) == 0)
return p->pio;
}
return -1;
}
/*
* This routine returns the recommended PIO settings for a given drive,
* based on the drive->id information and the ide_pio_blacklist[].
* This is used by most chipset support modules when "auto-tuning".
*/
/*
* Drive PIO mode auto selection
*/
byte ide_get_best_pio_mode (ide_drive_t *drive, byte mode_wanted, byte max_mode, ide_pio_data_t *d)
{
int pio_mode;
int cycle_time = 0;
int use_iordy = 0;
struct hd_driveid* id = drive->id;
int overridden = 0;
int blacklisted = 0;
if (mode_wanted != 255) {
pio_mode = mode_wanted;
} else if (!drive->id) {
pio_mode = 0;
} else if ((pio_mode = ide_scan_pio_blacklist(id->model)) != -1) {
overridden = 1;
blacklisted = 1;
use_iordy = (pio_mode > 2);
} else {
pio_mode = id->tPIO;
if (pio_mode > 2) { /* 2 is maximum allowed tPIO value */
pio_mode = 2;
overridden = 1;
}
if (id->field_valid & 2) { /* drive implements ATA2? */
if (id->capability & 8) { /* drive supports use_iordy? */
use_iordy = 1;
cycle_time = id->eide_pio_iordy;
if (id->eide_pio_modes & 7) {
overridden = 0;
if (id->eide_pio_modes & 4)
pio_mode = 5;
else if (id->eide_pio_modes & 2)
pio_mode = 4;
else
pio_mode = 3;
}
} else {
cycle_time = id->eide_pio;
}
}
#if 0
if (drive->id->major_rev_num & 0x0004) printk("ATA-2 ");
#endif
/*
* Conservative "downgrade" for all pre-ATA2 drives
*/
if (pio_mode && pio_mode < 4) {
pio_mode--;
overridden = 1;
#if 0
use_iordy = (pio_mode > 2);
#endif
if (cycle_time && cycle_time < ide_pio_timings[pio_mode].cycle_time)
cycle_time = 0; /* use standard timing */
}
}
if (pio_mode > max_mode) {
pio_mode = max_mode;
cycle_time = 0;
}
if (d) {
d->pio_mode = pio_mode;
d->cycle_time = cycle_time ? cycle_time : ide_pio_timings[pio_mode].cycle_time;
d->use_iordy = use_iordy;
d->overridden = overridden;
d->blacklisted = blacklisted;
}
return pio_mode;
}
#endif /* _IDE_C */
#endif /* CONFIG_BLK_DEV_IDE_MODES */
#endif /* _IDE_MODES_H */
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