ide.c

Linux Kernel 2.6.9 for OMAP1710

		printk("ide: failed opcode was %x\n", opcode);
	}
out:
	local_irq_restore(flags);
	return err;
}

EXPORT_SYMBOL(ide_dump_status);

static int ide_open (struct inode * inode, struct file * filp)
{
	return -ENXIO;
}

/*
 *	drives_lock protects the list of drives, drivers_lock the
 *	list of drivers.  Currently nobody takes both at once.
 */

static spinlock_t drives_lock = SPIN_LOCK_UNLOCKED;
static spinlock_t drivers_lock = SPIN_LOCK_UNLOCKED;
static LIST_HEAD(drivers);

/* Iterator for the driver list. */

static void *m_start(struct seq_file *m, loff_t *pos)
{
	struct list_head *p;
	loff_t l = *pos;
	spin_lock(&drivers_lock);
	list_for_each(p, &drivers)
		if (!l--)
			return list_entry(p, ide_driver_t, drivers);
	return NULL;
}

static void *m_next(struct seq_file *m, void *v, loff_t *pos)
{
	struct list_head *p = ((ide_driver_t *)v)->drivers.next;
	(*pos)++;
	return p==&drivers ? NULL : list_entry(p, ide_driver_t, drivers);
}

static void m_stop(struct seq_file *m, void *v)
{
	spin_unlock(&drivers_lock);
}

static int show_driver(struct seq_file *m, void *v)
{
	ide_driver_t *driver = v;
	seq_printf(m, "%s version %s\n", driver->name, driver->version);
	return 0;
}

struct seq_operations ide_drivers_op = {
	.start	= m_start,
	.next	= m_next,
	.stop	= m_stop,
	.show	= show_driver
};

#ifdef CONFIG_PROC_FS
struct proc_dir_entry *proc_ide_root;

ide_proc_entry_t generic_subdriver_entries[] = {
	{ "capacity",	S_IFREG|S_IRUGO,	proc_ide_read_capacity,	NULL },
	{ NULL, 0, NULL, NULL }
};
#endif

static struct resource* hwif_request_region(ide_hwif_t *hwif,
					    unsigned long addr, int num)
{
	struct resource *res = request_region(addr, num, hwif->name);

	if (!res)
		printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n",
				hwif->name, addr, addr+num-1);
	return res;
}

/**
 *	ide_hwif_request_regions - request resources for IDE
 *	@hwif: interface to use
 *
 *	Requests all the needed resources for an interface.
 *	Right now core IDE code does this work which is deeply wrong.
 *	MMIO leaves it to the controller driver,
 *	PIO will migrate this way over time.
 */

int ide_hwif_request_regions(ide_hwif_t *hwif)
{
	unsigned long addr;
	unsigned int i;

	if (hwif->mmio == 2)
		return 0;
	BUG_ON(hwif->mmio == 1);
	addr = hwif->io_ports[IDE_CONTROL_OFFSET];
	if (addr && !hwif_request_region(hwif, addr, 1))
		goto control_region_busy;
	hwif->straight8 = 0;
	addr = hwif->io_ports[IDE_DATA_OFFSET];
	if ((addr | 7) == hwif->io_ports[IDE_STATUS_OFFSET]) {
		if (!hwif_request_region(hwif, addr, 8))
			goto data_region_busy;
		hwif->straight8 = 1;
		return 0;
	}
	for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++) {
		addr = hwif->io_ports[i];
		if (!hwif_request_region(hwif, addr, 1)) {
			while (--i)
				release_region(addr, 1);
			goto data_region_busy;
		}
	}
	return 0;

data_region_busy:
	addr = hwif->io_ports[IDE_CONTROL_OFFSET];
	if (addr)
		release_region(addr, 1);
control_region_busy:
	/* If any errors are return, we drop the hwif interface. */
	return -EBUSY;
}

/**
 *	ide_hwif_release_regions - free IDE resources
 *
 *	Note that we only release the standard ports,
 *	and do not even try to handle any extra ports
 *	allocated for weird IDE interface chipsets.
 *
 *	Note also that we don't yet handle mmio resources here. More
 *	importantly our caller should be doing this so we need to 
 *	restructure this as a helper function for drivers.
 */

void ide_hwif_release_regions(ide_hwif_t *hwif)
{
	u32 i = 0;

	if (hwif->mmio == 2)
		return;
	if (hwif->io_ports[IDE_CONTROL_OFFSET])
		release_region(hwif->io_ports[IDE_CONTROL_OFFSET], 1);
	if (hwif->straight8) {
		release_region(hwif->io_ports[IDE_DATA_OFFSET], 8);
		return;
	}
	for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++)
		if (hwif->io_ports[i])
			release_region(hwif->io_ports[i], 1);
}

/**
 *	ide_hwif_restore	-	restore hwif to template
 *	@hwif: hwif to update
 *	@tmp_hwif: template
 *
 *	Restore hwif to a previous state by copying most settngs
 *	from the template.
 */

static void ide_hwif_restore(ide_hwif_t *hwif, ide_hwif_t *tmp_hwif)
{
	hwif->hwgroup			= tmp_hwif->hwgroup;

	hwif->gendev.parent		= tmp_hwif->gendev.parent;

	hwif->proc			= tmp_hwif->proc;

	hwif->major			= tmp_hwif->major;
	hwif->straight8			= tmp_hwif->straight8;
	hwif->bus_state			= tmp_hwif->bus_state;

	hwif->atapi_dma			= tmp_hwif->atapi_dma;
	hwif->ultra_mask		= tmp_hwif->ultra_mask;
	hwif->mwdma_mask		= tmp_hwif->mwdma_mask;
	hwif->swdma_mask		= tmp_hwif->swdma_mask;

	hwif->chipset			= tmp_hwif->chipset;
	hwif->hold			= tmp_hwif->hold;

#ifdef CONFIG_BLK_DEV_IDEPCI
	hwif->pci_dev			= tmp_hwif->pci_dev;
	hwif->cds			= tmp_hwif->cds;
#endif

	hwif->identify			= tmp_hwif->identify;
	hwif->tuneproc			= tmp_hwif->tuneproc;
	hwif->speedproc			= tmp_hwif->speedproc;
	hwif->selectproc		= tmp_hwif->selectproc;
	hwif->reset_poll		= tmp_hwif->reset_poll;
	hwif->pre_reset			= tmp_hwif->pre_reset;
	hwif->resetproc			= tmp_hwif->resetproc;
	hwif->intrproc			= tmp_hwif->intrproc;
	hwif->maskproc			= tmp_hwif->maskproc;
	hwif->quirkproc			= tmp_hwif->quirkproc;
	hwif->busproc			= tmp_hwif->busproc;

	hwif->ata_input_data		= tmp_hwif->ata_input_data;
	hwif->ata_output_data		= tmp_hwif->ata_output_data;
	hwif->atapi_input_bytes		= tmp_hwif->atapi_input_bytes;
	hwif->atapi_output_bytes	= tmp_hwif->atapi_output_bytes;

	hwif->ide_dma_read		= tmp_hwif->ide_dma_read;
	hwif->ide_dma_write		= tmp_hwif->ide_dma_write;
	hwif->ide_dma_begin		= tmp_hwif->ide_dma_begin;
	hwif->ide_dma_end		= tmp_hwif->ide_dma_end;
	hwif->ide_dma_check		= tmp_hwif->ide_dma_check;
	hwif->ide_dma_on		= tmp_hwif->ide_dma_on;
	hwif->ide_dma_off_quietly	= tmp_hwif->ide_dma_off_quietly;
	hwif->ide_dma_test_irq		= tmp_hwif->ide_dma_test_irq;
	hwif->ide_dma_host_on		= tmp_hwif->ide_dma_host_on;
	hwif->ide_dma_host_off		= tmp_hwif->ide_dma_host_off;
	hwif->ide_dma_verbose		= tmp_hwif->ide_dma_verbose;
	hwif->ide_dma_lostirq		= tmp_hwif->ide_dma_lostirq;
	hwif->ide_dma_timeout		= tmp_hwif->ide_dma_timeout;

	hwif->OUTB			= tmp_hwif->OUTB;
	hwif->OUTBSYNC			= tmp_hwif->OUTBSYNC;
	hwif->OUTW			= tmp_hwif->OUTW;
	hwif->OUTL			= tmp_hwif->OUTL;
	hwif->OUTSW			= tmp_hwif->OUTSW;
	hwif->OUTSL			= tmp_hwif->OUTSL;

	hwif->INB			= tmp_hwif->INB;
	hwif->INW			= tmp_hwif->INW;
	hwif->INL			= tmp_hwif->INL;
	hwif->INSW			= tmp_hwif->INSW;
	hwif->INSL			= tmp_hwif->INSL;

	hwif->mmio			= tmp_hwif->mmio;
	hwif->rqsize			= tmp_hwif->rqsize;
	hwif->no_lba48			= tmp_hwif->no_lba48;

#ifndef CONFIG_BLK_DEV_IDECS
	hwif->irq			= tmp_hwif->irq;
#endif

	hwif->dma_base			= tmp_hwif->dma_base;
	hwif->dma_master		= tmp_hwif->dma_master;
	hwif->dma_command		= tmp_hwif->dma_command;
	hwif->dma_vendor1		= tmp_hwif->dma_vendor1;
	hwif->dma_status		= tmp_hwif->dma_status;
	hwif->dma_vendor3		= tmp_hwif->dma_vendor3;
	hwif->dma_prdtable		= tmp_hwif->dma_prdtable;

	hwif->dma_extra			= tmp_hwif->dma_extra;
	hwif->config_data		= tmp_hwif->config_data;
	hwif->select_data		= tmp_hwif->select_data;
	hwif->autodma			= tmp_hwif->autodma;
	hwif->udma_four			= tmp_hwif->udma_four;
	hwif->no_dsc			= tmp_hwif->no_dsc;

	hwif->hwif_data			= tmp_hwif->hwif_data;
}

/**
 *	ide_unregister		-	free an ide interface
 *	@index: index of interface (will change soon to a pointer)
 *
 *	Perform the final unregister of an IDE interface. At the moment
 *	we don't refcount interfaces so this will also get split up.
 *
 *	Locking:
 *	The caller must not hold the IDE locks
 *	The drive present/vanishing is not yet properly locked
 *	Take care with the callbacks. These have been split to avoid
 *	deadlocking the IDE layer. The shutdown callback is called
 *	before we take the lock and free resources. It is up to the
 *	caller to be sure there is no pending I/O here, and that
 *	the interfce will not be reopened (present/vanishing locking
 *	isnt yet done btw). After we commit to the final kill we
 *	call the cleanup callback with the ide locks held.
 *
 *	Unregister restores the hwif structures to the default state.
 *	This is raving bonkers.
 */

void ide_unregister(unsigned int index)
{
	ide_drive_t *drive;
	ide_hwif_t *hwif, *g;
	static ide_hwif_t tmp_hwif; /* protected by ide_cfg_sem */
	ide_hwgroup_t *hwgroup;
	int irq_count = 0, unit, i;

	BUG_ON(index >= MAX_HWIFS);

	BUG_ON(in_interrupt());
	BUG_ON(irqs_disabled());
	down(&ide_cfg_sem);
	spin_lock_irq(&ide_lock);
	hwif = &ide_hwifs[index];
	if (!hwif->present)
		goto abort;
	for (unit = 0; unit < MAX_DRIVES; ++unit) {
		drive = &hwif->drives[unit];
		if (!drive->present)
			continue;
		if (drive->usage || DRIVER(drive)->busy)
			goto abort;
		drive->dead = 1;
	}
	hwif->present = 0;

	spin_unlock_irq(&ide_lock);

	for (unit = 0; unit < MAX_DRIVES; ++unit) {
		drive = &hwif->drives[unit];
		if (!drive->present)
			continue;
		DRIVER(drive)->cleanup(drive);
	}

#ifdef CONFIG_PROC_FS
	destroy_proc_ide_drives(hwif);
#endif

	hwgroup = hwif->hwgroup;
	/*
	 * free the irq if we were the only hwif using it
	 */
	g = hwgroup->hwif;
	do {
		if (g->irq == hwif->irq)
			++irq_count;
		g = g->next;
	} while (g != hwgroup->hwif);
	if (irq_count == 1)
		free_irq(hwif->irq, hwgroup);

	spin_lock_irq(&ide_lock);
	/*
	 * Note that we only release the standard ports,
	 * and do not even try to handle any extra ports
	 * allocated for weird IDE interface chipsets.
	 */
	ide_hwif_release_regions(hwif);

	/*
	 * Remove us from the hwgroup, and free
	 * the hwgroup if we were the only member
	 */
	for (i = 0; i < MAX_DRIVES; ++i) {
		drive = &hwif->drives[i];
		if (drive->devfs_name[0] != '\0') {
			devfs_remove(drive->devfs_name);
			drive->devfs_name[0] = '\0';
		}
		if (!drive->present)
			continue;
		if (drive == drive->next) {
			/* special case: last drive from hwgroup. */
			BUG_ON(hwgroup->drive != drive);
			hwgroup->drive = NULL;
		} else {
			ide_drive_t *walk;

			walk = hwgroup->drive;
			while (walk->next != drive)
				walk = walk->next;
			walk->next = drive->next;
			if (hwgroup->drive == drive) {
				hwgroup->drive = drive->next;
				hwgroup->hwif = HWIF(hwgroup->drive);
			}
		}
		BUG_ON(hwgroup->drive == drive);
		if (drive->id != NULL) {
			kfree(drive->id);
			drive->id = NULL;
		}
		drive->present = 0;
		/* Messed up locking ... */
		spin_unlock_irq(&ide_lock);
		blk_cleanup_queue(drive->queue);
		device_unregister(&drive->gendev);
		down(&drive->gendev_rel_sem);
		spin_lock_irq(&ide_lock);
		drive->queue = NULL;
	}
	if (hwif->next == hwif) {
		BUG_ON(hwgroup->hwif != hwif);
		kfree(hwgroup);
	} else {
		/* There is another interface in hwgroup.
		 * Unlink us, and set hwgroup->drive and ->hwif to
		 * something sane.
		 */
		g = hwgroup->hwif;
		while (g->next != hwif)
			g = g->next;
		g->next = hwif->next;
		if (hwgroup->hwif == hwif) {
			/* Chose a random hwif for hwgroup->hwif.
			 * It's guaranteed that there are no drives
			 * left in the hwgroup.
			 */
			BUG_ON(hwgroup->drive != NULL);
			hwgroup->hwif = g;
		}
		BUG_ON(hwgroup->hwif == hwif);
	}

	/* More messed up locking ... */
	spin_unlock_irq(&ide_lock);
	device_unregister(&hwif->gendev);
	down(&hwif->gendev_rel_sem);

	/*
	 * Remove us from the kernel's knowledge
	 */
	blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
	for (i = 0; i < MAX_DRIVES; i++) {
		struct gendisk *disk = hwif->drives[i].disk;
		hwif->drives[i].disk = NULL;
		put_disk(disk);
	}
	unregister_blkdev(hwif->major, hwif->name);
	spin_lock_irq(&ide_lock);

	if (hwif->dma_base) {
		(void) ide_release_dma(hwif);

		hwif->dma_base = 0;
		hwif->dma_master = 0;
		hwif->dma_command = 0;
		hwif->dma_vendor1 = 0;
		hwif->dma_status = 0;
		hwif->dma_vendor3 = 0;
		hwif->dma_prdtable = 0;
	}

	/* copy original settings */
	tmp_hwif = *hwif;

	/* restore hwif data to pristine status */
	init_hwif_data(hwif, index);
	init_hwif_default(hwif, index);

	ide_hwif_restore(hwif, &tmp_hwif);

abort:
	spin_unlock_irq(&ide_lock);
	up(&ide_cfg_sem);
}

EXPORT_SYMBOL(ide_unregister);


/**
 *	ide_setup_ports 	-	set up IDE interface ports
 *	@hw: register descriptions
 *	@base: base register
 *	@offsets: table of register offsets
 *	@ctrl: control register
 *	@ack_irq: IRQ ack
 *	@irq: interrupt lie
 *
 *	Setup hw_regs_t structure described by parameters.  You
 *	may set up the hw structure yourself OR use this routine to
 *	do it for you. This is basically a helper
 *
 */
 
void ide_setup_ports (	hw_regs_t *hw,
			unsigned long base, int *offsets,
			unsigned long ctrl, unsigned long intr,
			ide_ack_intr_t *ack_intr,
/*