diff options
Diffstat (limited to 'drivers/ide/ide-atapi.c')
| -rw-r--r-- | drivers/ide/ide-atapi.c | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/drivers/ide/ide-atapi.c b/drivers/ide/ide-atapi.c index 12674e6..61c52fb 100644 --- a/drivers/ide/ide-atapi.c +++ b/drivers/ide/ide-atapi.c @@ -14,6 +14,53 @@ #define debug_log(fmt, args...) do {} while (0) #endif +/* + * Check whether we can support a device, + * based on the ATAPI IDENTIFY command results. + */ +int ide_check_atapi_device(ide_drive_t *drive, const char *s) +{ + u16 *id = drive->id; + u8 gcw[2], protocol, device_type, removable, drq_type, packet_size; + + *((u16 *)&gcw) = id[ATA_ID_CONFIG]; + + protocol = (gcw[1] & 0xC0) >> 6; + device_type = gcw[1] & 0x1F; + removable = (gcw[0] & 0x80) >> 7; + drq_type = (gcw[0] & 0x60) >> 5; + packet_size = gcw[0] & 0x03; + +#ifdef CONFIG_PPC + /* kludge for Apple PowerBook internal zip */ + if (drive->media == ide_floppy && device_type == 5 && + !strstr((char *)&id[ATA_ID_PROD], "CD-ROM") && + strstr((char *)&id[ATA_ID_PROD], "ZIP")) + device_type = 0; +#endif + + if (protocol != 2) + printk(KERN_ERR "%s: %s: protocol (0x%02x) is not ATAPI\n", + s, drive->name, protocol); + else if ((drive->media == ide_floppy && device_type != 0) || + (drive->media == ide_tape && device_type != 1)) + printk(KERN_ERR "%s: %s: invalid device type (0x%02x)\n", + s, drive->name, device_type); + else if (removable == 0) + printk(KERN_ERR "%s: %s: the removable flag is not set\n", + s, drive->name); + else if (drive->media == ide_floppy && drq_type == 3) + printk(KERN_ERR "%s: %s: sorry, DRQ type (0x%02x) not " + "supported\n", s, drive->name, drq_type); + else if (packet_size != 0) + printk(KERN_ERR "%s: %s: packet size (0x%02x) is not 12 " + "bytes\n", s, drive->name, packet_size); + else + return 1; + return 0; +} +EXPORT_SYMBOL_GPL(ide_check_atapi_device); + /* TODO: unify the code thus making some arguments go away */ ide_startstop_t ide_pc_intr(ide_drive_t *drive, struct ide_atapi_pc *pc, ide_handler_t *handler, unsigned int timeout, ide_expiry_t *expiry, |