path: root/drivers/ide/ide-probe.c

/*
 *  Copyright (C) 1994-1998   Linus Torvalds & authors (see below)
 *  Copyright (C) 2005, 2007  Bartlomiej Zolnierkiewicz
 */

/*
 *  Mostly written by Mark Lord <mlord@pobox.com>
 *                and Gadi Oxman <gadio@netvision.net.il>
 *                and Andre Hedrick <andre@linux-ide.org>
 *
 *  See linux/MAINTAINERS for address of current maintainer.
 *
 * This is the IDE probe module, as evolved from hd.c and ide.c.
 *
 * -- increase WAIT_PIDENTIFY to avoid CD-ROM locking at boot
 *	 by Andrea Arcangeli
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/timer.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/major.h>
#include <linux/errno.h>
#include <linux/genhd.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/ide.h>
#include <linux/spinlock.h>
#include <linux/kmod.h>
#include <linux/pci.h>
#include <linux/scatterlist.h>

#include <asm/byteorder.h>
#include <asm/irq.h>
#include <asm/uaccess.h>
#include <asm/io.h>

/**
 *	generic_id		-	add a generic drive id
 *	@drive:	drive to make an ID block for
 *	
 *	Add a fake id field to the drive we are passed. This allows
 *	use to skip a ton of NULL checks (which people always miss) 
 *	and make drive properties unconditional outside of this file
 */
 
static void generic_id(ide_drive_t *drive)
{
	u16 *id = drive->id;

	id[ATA_ID_CUR_CYLS]	= id[ATA_ID_CYLS]	= drive->cyl;
	id[ATA_ID_CUR_HEADS]	= id[ATA_ID_HEADS]	= drive->head;
	id[ATA_ID_CUR_SECTORS]	= id[ATA_ID_SECTORS]	= drive->sect;
}

static void ide_disk_init_chs(ide_drive_t *drive)
{
	u16 *id = drive->id;

	/* Extract geometry if we did not already have one for the drive */
	if (!drive->cyl || !drive->head || !drive->sect) {
		drive->cyl  = drive->bios_cyl  = id[ATA_ID_CYLS];
		drive->head = drive->bios_head = id[ATA_ID_HEADS];
		drive->sect = drive->bios_sect = id[ATA_ID_SECTORS];
	}

	/* Handle logical geometry translation by the drive */
	if (ata_id_current_chs_valid(id)) {
		drive->cyl  = id[ATA_ID_CUR_CYLS];
		drive->head = id[ATA_ID_CUR_HEADS];
		drive->sect = id[ATA_ID_CUR_SECTORS];
	}

	/* Use physical geometry if what we have still makes no sense */
	if (drive->head > 16 && id[ATA_ID_HEADS] && id[ATA_ID_HEADS] <= 16) {
		drive->cyl  = id[ATA_ID_CYLS];
		drive->head = id[ATA_ID_HEADS];
		drive->sect = id[ATA_ID_SECTORS];
	}
}

static void ide_disk_init_mult_count(ide_drive_t *drive)
{
	u16 *id = drive->id;
	u8 max_multsect = id[ATA_ID_MAX_MULTSECT] & 0xff;

	if (max_multsect) {
		if ((max_multsect / 2) > 1)
			id[ATA_ID_MULTSECT] = max_multsect | 0x100;
		else
			id[ATA_ID_MULTSECT] &= ~0x1ff;

		drive->mult_req = id[ATA_ID_MULTSECT] & 0xff;

		if (drive->mult_req)
			drive->special_flags |= IDE_SFLAG_SET_MULTMODE;
	}
}

static void ide_classify_ata_dev(ide_drive_t *drive)
{
	u16 *id = drive->id;
	char *m = (char *)&id[ATA_ID_PROD];
	int is_cfa = ata_id_is_cfa(id);

	/* CF devices are *not* removable in Linux definition of the term */
	if (is_cfa == 0 && (id[ATA_ID_CONFIG] & (1 << 7)))
		drive->dev_flags |= IDE_DFLAG_REMOVABLE;

	drive->media = ide_disk;

	if (!ata_id_has_unload(drive->id))
		drive->dev_flags |= IDE_DFLAG_NO_UNLOAD;

	printk(KERN_INFO "%s: %s, %s DISK drive\n", drive->name, m,
		is_cfa ? "CFA" : "ATA");
}

static void ide_classify_atapi_dev(ide_drive_t *drive)
{
	u16 *id = drive->id;
	char *m = (char *)&id[ATA_ID_PROD];
	u8 type = (id[ATA_ID_CONFIG] >> 8) & 0x1f;

	printk(KERN_INFO "%s: %s, ATAPI ", drive->name, m);
	switch (type) {
	case ide_floppy:
		if (!strstr(m, "CD-ROM")) {
			if (!strstr(m, "oppy") &&
			    !strstr(m, "poyp") &&
			    !strstr(m, "ZIP"))
				printk(KERN_CONT "cdrom or floppy?, assuming ");
			if (drive->media != ide_cdrom) {
				printk(KERN_CONT "FLOPPY");
				drive->dev_flags |= IDE_DFLAG_REMOVABLE;
				break;
			}
		}
		/* Early cdrom models used zero */
		type = ide_cdrom;
	case ide_cdrom:
		drive->dev_flags |= IDE_DFLAG_REMOVABLE;
#ifdef CONFIG_PPC
		/* kludge for Apple PowerBook internal zip */
		if (!strstr(m, "CD-ROM") && strstr(m, "ZIP")) {
			printk(KERN_CONT "FLOPPY");
			type = ide_floppy;
			break;
		}
#endif
		printk(KERN_CONT "CD/DVD-ROM");
		break;
	case ide_tape:
		printk(KERN_CONT "TAPE");
		break;
	case ide_optical:
		printk(KERN_CONT "OPTICAL");