ide.c

linux 内核源代码

	ide_hwif_t *hwif = HWIF(drive);
	struct request rq;
	struct request_pm_state rqpm;
	ide_task_t args;
	int ret;

	/* Call ACPI _GTM only once */
	if (!(drive->dn % 2))
		ide_acpi_get_timing(hwif);

	memset(&rq, 0, sizeof(rq));
	memset(&rqpm, 0, sizeof(rqpm));
	memset(&args, 0, sizeof(args));
	rq.cmd_type = REQ_TYPE_PM_SUSPEND;
	rq.special = &args;
	rq.data = &rqpm;
	rqpm.pm_step = ide_pm_state_start_suspend;
	if (mesg.event == PM_EVENT_PRETHAW)
		mesg.event = PM_EVENT_FREEZE;
	rqpm.pm_state = mesg.event;

	ret = ide_do_drive_cmd(drive, &rq, ide_wait);
	/* only call ACPI _PS3 after both drivers are suspended */
	if (!ret && (((drive->dn % 2) && hwif->drives[0].present
		 && hwif->drives[1].present)
		 || !hwif->drives[0].present
		 || !hwif->drives[1].present))
		ide_acpi_set_state(hwif, 0);
	return ret;
}

static int generic_ide_resume(struct device *dev)
{
	ide_drive_t *drive = dev->driver_data;
	ide_hwif_t *hwif = HWIF(drive);
	struct request rq;
	struct request_pm_state rqpm;
	ide_task_t args;
	int err;

	/* Call ACPI _STM only once */
	if (!(drive->dn % 2)) {
		ide_acpi_set_state(hwif, 1);
		ide_acpi_push_timing(hwif);
	}

	ide_acpi_exec_tfs(drive);

	memset(&rq, 0, sizeof(rq));
	memset(&rqpm, 0, sizeof(rqpm));
	memset(&args, 0, sizeof(args));
	rq.cmd_type = REQ_TYPE_PM_RESUME;
	rq.special = &args;
	rq.data = &rqpm;
	rqpm.pm_step = ide_pm_state_start_resume;
	rqpm.pm_state = PM_EVENT_ON;

	err = ide_do_drive_cmd(drive, &rq, ide_head_wait);

	if (err == 0 && dev->driver) {
		ide_driver_t *drv = to_ide_driver(dev->driver);

		if (drv->resume)
			drv->resume(drive);
	}

	return err;
}

int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device *bdev,
			unsigned int cmd, unsigned long arg)
{
	unsigned long flags;
	ide_driver_t *drv;
	void __user *p = (void __user *)arg;
	int err = 0, (*setfunc)(ide_drive_t *, int);
	u8 *val;

	switch (cmd) {
	case HDIO_GET_32BIT:	    val = &drive->io_32bit;	 goto read_val;
	case HDIO_GET_KEEPSETTINGS: val = &drive->keep_settings; goto read_val;
	case HDIO_GET_UNMASKINTR:   val = &drive->unmask;	 goto read_val;
	case HDIO_GET_DMA:	    val = &drive->using_dma;	 goto read_val;
	case HDIO_SET_32BIT:	    setfunc = set_io_32bit;	 goto set_val;
	case HDIO_SET_KEEPSETTINGS: setfunc = set_ksettings;	 goto set_val;
	case HDIO_SET_PIO_MODE:	    setfunc = set_pio_mode;	 goto set_val;
	case HDIO_SET_UNMASKINTR:   setfunc = set_unmaskirq;	 goto set_val;
	case HDIO_SET_DMA:	    setfunc = set_using_dma;	 goto set_val;
	}

	switch (cmd) {
		case HDIO_OBSOLETE_IDENTITY:
		case HDIO_GET_IDENTITY:
			if (bdev != bdev->bd_contains)
				return -EINVAL;
			if (drive->id_read == 0)
				return -ENOMSG;
			if (copy_to_user(p, drive->id, (cmd == HDIO_GET_IDENTITY) ? sizeof(*drive->id) : 142))
				return -EFAULT;
			return 0;

		case HDIO_GET_NICE:
			return put_user(drive->dsc_overlap	<<	IDE_NICE_DSC_OVERLAP	|
					drive->atapi_overlap	<<	IDE_NICE_ATAPI_OVERLAP	|
					drive->nice0		<< 	IDE_NICE_0		|
					drive->nice1		<<	IDE_NICE_1		|
					drive->nice2		<<	IDE_NICE_2,
					(long __user *) arg);

#ifdef CONFIG_IDE_TASK_IOCTL
		case HDIO_DRIVE_TASKFILE:
		        if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
				return -EACCES;
			switch(drive->media) {
				case ide_disk:
					return ide_taskfile_ioctl(drive, cmd, arg);
				default:
					return -ENOMSG;
			}
#endif /* CONFIG_IDE_TASK_IOCTL */

		case HDIO_DRIVE_CMD:
			if (!capable(CAP_SYS_RAWIO))
				return -EACCES;
			return ide_cmd_ioctl(drive, cmd, arg);

		case HDIO_DRIVE_TASK:
			if (!capable(CAP_SYS_RAWIO))
				return -EACCES;
			return ide_task_ioctl(drive, cmd, arg);

		case HDIO_SCAN_HWIF:
		{
			hw_regs_t hw;
			int args[3];
			if (!capable(CAP_SYS_RAWIO)) return -EACCES;
			if (copy_from_user(args, p, 3 * sizeof(int)))
				return -EFAULT;
			memset(&hw, 0, sizeof(hw));
			ide_init_hwif_ports(&hw, (unsigned long) args[0],
					    (unsigned long) args[1], NULL);
			hw.irq = args[2];
			if (ide_register_hw(&hw, NULL, 0, NULL) == -1)
				return -EIO;
			return 0;
		}
	        case HDIO_UNREGISTER_HWIF:
			if (!capable(CAP_SYS_RAWIO)) return -EACCES;
			/* (arg > MAX_HWIFS) checked in function */
			ide_unregister(arg);
			return 0;
		case HDIO_SET_NICE:
			if (!capable(CAP_SYS_ADMIN)) return -EACCES;
			if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
				return -EPERM;
			drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1;
			drv = *(ide_driver_t **)bdev->bd_disk->private_data;
			if (drive->dsc_overlap && !drv->supports_dsc_overlap) {
				drive->dsc_overlap = 0;
				return -EPERM;
			}
			drive->nice1 = (arg >> IDE_NICE_1) & 1;
			return 0;
		case HDIO_DRIVE_RESET:
		{
			unsigned long flags;
			if (!capable(CAP_SYS_ADMIN)) return -EACCES;
			
			/*
			 *	Abort the current command on the
			 *	group if there is one, taking
			 *	care not to allow anything else
			 *	to be queued and to die on the
			 *	spot if we miss one somehow
			 */

			spin_lock_irqsave(&ide_lock, flags);

			if (HWGROUP(drive)->resetting) {
				spin_unlock_irqrestore(&ide_lock, flags);
				return -EBUSY;
			}

			ide_abort(drive, "drive reset");

			BUG_ON(HWGROUP(drive)->handler);
				
			/* Ensure nothing gets queued after we
			   drop the lock. Reset will clear the busy */
		   
			HWGROUP(drive)->busy = 1;
			spin_unlock_irqrestore(&ide_lock, flags);
			(void) ide_do_reset(drive);

			return 0;
		}

		case HDIO_GET_BUSSTATE:
			if (!capable(CAP_SYS_ADMIN))
				return -EACCES;
			if (put_user(HWIF(drive)->bus_state, (long __user *)arg))
				return -EFAULT;
			return 0;

		case HDIO_SET_BUSSTATE:
			if (!capable(CAP_SYS_ADMIN))
				return -EACCES;
			if (HWIF(drive)->busproc)
				return HWIF(drive)->busproc(drive, (int)arg);
			return -EOPNOTSUPP;
		default:
			return -EINVAL;
	}

read_val:
	mutex_lock(&ide_setting_mtx);
	spin_lock_irqsave(&ide_lock, flags);
	err = *val;
	spin_unlock_irqrestore(&ide_lock, flags);
	mutex_unlock(&ide_setting_mtx);
	return err >= 0 ? put_user(err, (long __user *)arg) : err;

set_val:
	if (bdev != bdev->bd_contains)
		err = -EINVAL;
	else {
		if (!capable(CAP_SYS_ADMIN))
			err = -EACCES;
		else {
			mutex_lock(&ide_setting_mtx);
			err = setfunc(drive, arg);
			mutex_unlock(&ide_setting_mtx);
		}
	}
	return err;
}

EXPORT_SYMBOL(generic_ide_ioctl);

/*
 * stridx() returns the offset of c within s,
 * or -1 if c is '\0' or not found within s.
 */
static int __init stridx (const char *s, char c)
{
	char *i = strchr(s, c);
	return (i && c) ? i - s : -1;
}

/*
 * match_parm() does parsing for ide_setup():
 *
 * 1. the first char of s must be '='.
 * 2. if the remainder matches one of the supplied keywords,
 *     the index (1 based) of the keyword is negated and returned.
 * 3. if the remainder is a series of no more than max_vals numbers
 *     separated by commas, the numbers are saved in vals[] and a
 *     count of how many were saved is returned.  Base10 is assumed,
 *     and base16 is allowed when prefixed with "0x".
 * 4. otherwise, zero is returned.
 */
static int __init match_parm (char *s, const char *keywords[], int vals[], int max_vals)
{
	static const char *decimal = "0123456789";
	static const char *hex = "0123456789abcdef";
	int i, n;

	if (*s++ == '=') {
		/*
		 * Try matching against the supplied keywords,
		 * and return -(index+1) if we match one
		 */
		if (keywords != NULL) {
			for (i = 0; *keywords != NULL; ++i) {
				if (!strcmp(s, *keywords++))
					return -(i+1);
			}
		}
		/*
		 * Look for a series of no more than "max_vals"
		 * numeric values separated by commas, in base10,
		 * or base16 when prefixed with "0x".
		 * Return a count of how many were found.
		 */
		for (n = 0; (i = stridx(decimal, *s)) >= 0;) {
			vals[n] = i;
			while ((i = stridx(decimal, *++s)) >= 0)
				vals[n] = (vals[n] * 10) + i;
			if (*s == 'x' && !vals[n]) {
				while ((i = stridx(hex, *++s)) >= 0)
					vals[n] = (vals[n] * 0x10) + i;
			}
			if (++n == max_vals)
				break;
			if (*s == ',' || *s == ';')
				++s;
		}
		if (!*s)
			return n;
	}
	return 0;	/* zero = nothing matched */
}

#ifdef CONFIG_BLK_DEV_ALI14XX
extern int probe_ali14xx;
extern int ali14xx_init(void);
#endif
#ifdef CONFIG_BLK_DEV_UMC8672
extern int probe_umc8672;
extern int umc8672_init(void);
#endif
#ifdef CONFIG_BLK_DEV_DTC2278
extern int probe_dtc2278;
extern int dtc2278_init(void);
#endif
#ifdef CONFIG_BLK_DEV_HT6560B
extern int probe_ht6560b;
extern int ht6560b_init(void);
#endif
#ifdef CONFIG_BLK_DEV_QD65XX
extern int probe_qd65xx;
extern int qd65xx_init(void);
#endif

static int __initdata is_chipset_set[MAX_HWIFS];

/*
 * ide_setup() gets called VERY EARLY during initialization,
 * to handle kernel "command line" strings beginning with "hdx=" or "ide".
 *
 * Remember to update Documentation/ide.txt if you change something here.
 */
static int __init ide_setup(char *s)
{
	int i, vals[3];
	ide_hwif_t *hwif;
	ide_drive_t *drive;
	unsigned int hw, unit;
	const char max_drive = 'a' + ((MAX_HWIFS * MAX_DRIVES) - 1);
	const char max_hwif  = '0' + (MAX_HWIFS - 1);

	
	if (strncmp(s,"hd",2) == 0 && s[2] == '=')	/* hd= is for hd.c   */
		return 0;				/* driver and not us */

	if (strncmp(s,"ide",3) && strncmp(s,"idebus",6) && strncmp(s,"hd",2))
		return 0;

	printk(KERN_INFO "ide_setup: %s", s);
	init_ide_data ();

#ifdef CONFIG_BLK_DEV_IDEDOUBLER
	if (!strcmp(s, "ide=doubler")) {
		extern int ide_doubler;

		printk(" : Enabled support for IDE doublers\n");
		ide_doubler = 1;
		return 1;
	}
#endif /* CONFIG_BLK_DEV_IDEDOUBLER */

	if (!strcmp(s, "ide=nodma")) {
		printk(" : Prevented DMA\n");
		noautodma = 1;
		goto obsolete_option;
	}

#ifdef CONFIG_IDEPCI_PCIBUS_ORDER
	if (!strcmp(s, "ide=reverse")) {
		ide_scan_direction = 1;
		printk(" : Enabled support for IDE inverse scan order.\n");
		return 1;
	}
#endif

#ifdef CONFIG_BLK_DEV_IDEACPI
	if (!strcmp(s, "ide=noacpi")) {
		//printk(" : Disable IDE ACPI support.\n");
		ide_noacpi = 1;
		return 1;
	}
	if (!strcmp(s, "ide=acpigtf")) {
		//printk(" : Enable IDE ACPI _GTF support.\n");
		ide_noacpitfs = 0;
		return 1;
	}
	if (!strcmp(s, "ide=acpionboot")) {
		//printk(" : Call IDE ACPI methods on boot.\n");
		ide_noacpionboot = 0;
		return 1;
	}
#endif /* CONFIG_BLK_DEV_IDEACPI */

	/*
	 * Look for drive options:  "hdx="
	 */
	if (s[0] == 'h' && s[1] == 'd' && s[2] >= 'a' && s[2] <= max_drive) {
		const char *hd_words[] = {
			"none", "noprobe", "nowerr", "cdrom", "nodma",
			"autotune", "noautotune", "minus8", "swapdata", "bswap",
			"noflush", "remap", "remap63", "scsi", NULL };
		unit = s[2] - 'a';
		hw   = unit / MAX_DRIVES;
		unit = unit % MAX_DRIVES;
		hwif = &ide_hwifs[hw];
		drive = &hwif->drives[unit];
		if (strncmp(s + 4, "ide-", 4) == 0) {
			strlcpy(drive->driver_req, s + 4, sizeof(drive->driver_req));
			goto done;
		}
		switch (match_parm(&s[3], hd_words, vals, 3)) {
			case -1: /* "none" */
			case -2: /* "noprobe" */
				drive->noprobe = 1;
				goto done;
			case -3: /* "nowerr" */
				drive->bad_wstat = BAD_R_STAT;
				hwif->noprobe = 0;
				goto done;
			case -4: /* "cdrom" */
				drive->present = 1;
				drive->media = ide_cdrom;
				/* an ATAPI device ignores DRDY */
				drive->ready_stat = 0;
				hwif->noprobe = 0;
				goto done;
			case -5: /* nodma */
				drive->nodma = 1;
				goto done;
			case -6: /* "autotune" */
				drive->autotune = IDE_TUNE_AUTO;
				goto obsolete_option;
			case -7: /* "noautotune" */
				drive->autotune = IDE_TUNE_NOAUTO;
				goto obsolete_option;
			case -9: /* "swapdata" */
			case -10: /* "bswap" */
				drive->bswap = 1;
				goto done;
			case -11: /* noflush */
				drive->noflush = 1;
				goto done;
			case -12: /* "remap" */
				drive->remap_0_to_1 = 1;
				goto done;
			case -13: /* "remap63" */
				drive->sect0 = 63;
				goto done;
			case -14: /* "scsi" */
				drive->scsi = 1;
				goto done;
			case 3: /* cyl,head,sect */
				drive->media	= ide_disk;
				drive->ready_stat = READY_STAT;
				drive->cyl	= drive->bios_cyl  = vals[0];
				drive->head	= drive->bios_head = vals[1];
				drive->sect	= drive->bios_sect = vals[2];
				drive->present	= 1;
				drive->forced_geom = 1;
				hwif->noprobe = 0;
				goto done;
			default:
				goto bad_option;
		}
	}