ide-floppy.c

em85xx的大硬盘修正代码包

{
	idefloppy_init_pc(pc);
	pc->c[0] = IDEFLOPPY_TEST_UNIT_READY_CMD;
}

static void idefloppy_create_rw_cmd (idefloppy_floppy_t *floppy, idefloppy_pc_t *pc, struct request *rq, unsigned long sector)
{
	int block = sector / floppy->bs_factor;
	int blocks = rq->nr_sectors / floppy->bs_factor;
	
#if IDEFLOPPY_DEBUG_LOG
	printk ("create_rw1%d_cmd: block == %d, blocks == %d\n",
		2 * test_bit (IDEFLOPPY_USE_READ12, &floppy->flags), block, blocks);
#endif /* IDEFLOPPY_DEBUG_LOG */

	idefloppy_init_pc (pc);
	if (test_bit (IDEFLOPPY_USE_READ12, &floppy->flags)) {
		pc->c[0] = rq->cmd == READ ? IDEFLOPPY_READ12_CMD : IDEFLOPPY_WRITE12_CMD;
		put_unaligned (htonl (blocks), (unsigned int *) &pc->c[6]);
	} else {
		pc->c[0] = rq->cmd == READ ? IDEFLOPPY_READ10_CMD : IDEFLOPPY_WRITE10_CMD;
		put_unaligned (htons (blocks), (unsigned short *) &pc->c[7]);
	}
	put_unaligned (htonl (block), (unsigned int *) &pc->c[2]);
	pc->callback = &idefloppy_rw_callback;
	pc->rq = rq;
	pc->b_data = rq->buffer;
	pc->b_count = rq->cmd == READ ? 0 : rq->bh->b_size;
	if (rq->cmd == WRITE)
		set_bit (PC_WRITING, &pc->flags);
	pc->buffer = NULL;
	pc->request_transfer = pc->buffer_size = blocks * floppy->block_size;
	set_bit (PC_DMA_RECOMMENDED, &pc->flags);
}

/*
 *	idefloppy_do_request is our request handling function.	
 */
static ide_startstop_t idefloppy_do_request (ide_drive_t *drive, struct request *rq, unsigned long block)
{
	idefloppy_floppy_t *floppy = drive->driver_data;
	idefloppy_pc_t *pc;

#if IDEFLOPPY_DEBUG_LOG
	printk (KERN_INFO "rq_status: %d, rq_dev: %u, cmd: %d, errors: %d\n",rq->rq_status,(unsigned int) rq->rq_dev,rq->cmd,rq->errors);
	printk (KERN_INFO "sector: %ld, nr_sectors: %ld, current_nr_sectors: %ld\n",rq->sector,rq->nr_sectors,rq->current_nr_sectors);
#endif /* IDEFLOPPY_DEBUG_LOG */

	if (rq->errors >= ERROR_MAX) {
		if (floppy->failed_pc != NULL)
			printk (KERN_ERR "ide-floppy: %s: I/O error, pc = %2x, key = %2x, asc = %2x, ascq = %2x\n",
				drive->name, floppy->failed_pc->c[0], floppy->sense_key, floppy->asc, floppy->ascq);
		else
			printk (KERN_ERR "ide-floppy: %s: I/O error\n", drive->name);
		idefloppy_end_request (0, HWGROUP(drive));
		return ide_stopped;
	}
	switch (rq->cmd) {
		case READ:
		case WRITE:
			if (rq->sector % floppy->bs_factor || rq->nr_sectors % floppy->bs_factor) {
				printk ("%s: unsupported r/w request size\n", drive->name);
				idefloppy_end_request (0, HWGROUP(drive));
				return ide_stopped;
			}
			pc = idefloppy_next_pc_storage (drive);
			idefloppy_create_rw_cmd (floppy, pc, rq, block);
			break;
		case IDEFLOPPY_PC_RQ:
			pc = (idefloppy_pc_t *) rq->buffer;
			break;
		default:
			printk (KERN_ERR "ide-floppy: unsupported command %x in request queue\n", rq->cmd);
			idefloppy_end_request (0,HWGROUP (drive));
			return ide_stopped;
	}
	pc->rq = rq;
	return idefloppy_issue_pc (drive, pc);
}

/*
 *	idefloppy_queue_pc_tail adds a special packet command request to the
 *	tail of the request queue, and waits for it to be serviced.
 */
static int idefloppy_queue_pc_tail (ide_drive_t *drive,idefloppy_pc_t *pc)
{
	struct request rq;

	ide_init_drive_cmd (&rq);
	rq.buffer = (char *) pc;
	rq.cmd = IDEFLOPPY_PC_RQ;
	return ide_do_drive_cmd (drive, &rq, ide_wait);
}

/*
 *	Look at the flexible disk page parameters. We will ignore the CHS
 *	capacity parameters and use the LBA parameters instead.
 */
static int idefloppy_get_flexible_disk_page (ide_drive_t *drive)
{
	idefloppy_floppy_t *floppy = drive->driver_data;
	idefloppy_pc_t pc;
	idefloppy_mode_parameter_header_t *header;
	idefloppy_flexible_disk_page_t *page;
	int capacity, lba_capacity;

	idefloppy_create_mode_sense_cmd (&pc, IDEFLOPPY_FLEXIBLE_DISK_PAGE, MODE_SENSE_CURRENT);
	if (idefloppy_queue_pc_tail (drive,&pc)) {
		printk (KERN_ERR "ide-floppy: Can't get flexible disk page parameters\n");
		return 1;
	}
	header = (idefloppy_mode_parameter_header_t *) pc.buffer;
	floppy->wp = header->wp;
	page = (idefloppy_flexible_disk_page_t *) (header + 1);

	page->transfer_rate = ntohs (page->transfer_rate);
	page->sector_size = ntohs (page->sector_size);
	page->cyls = ntohs (page->cyls);
	page->rpm = ntohs (page->rpm);
	capacity = page->cyls * page->heads * page->sectors * page->sector_size;
	if (memcmp (page, &floppy->flexible_disk_page, sizeof (idefloppy_flexible_disk_page_t)))
		printk (KERN_INFO "%s: %dkB, %d/%d/%d CHS, %d kBps, %d sector size, %d rpm\n",
			drive->name, capacity / 1024, page->cyls, page->heads, page->sectors,
			page->transfer_rate / 8, page->sector_size, page->rpm);

	floppy->flexible_disk_page = *page;
	drive->bios_cyl = page->cyls;
	drive->bios_head = page->heads;
	drive->bios_sect = page->sectors;
	lba_capacity = floppy->blocks * floppy->block_size;
	if (capacity < lba_capacity) {
		printk (KERN_NOTICE "%s: The disk reports a capacity of %d bytes, "
			"but the drive only handles %d\n",
			drive->name, lba_capacity, capacity);
		floppy->blocks = floppy->block_size ? capacity / floppy->block_size : 0;
	}
	return 0;
}

static int idefloppy_get_capability_page(ide_drive_t *drive)
{
	idefloppy_floppy_t *floppy = drive->driver_data;
	idefloppy_pc_t pc;
	idefloppy_mode_parameter_header_t *header;
	idefloppy_capabilities_page_t *page;

	floppy->srfp=0;
	idefloppy_create_mode_sense_cmd (&pc, IDEFLOPPY_CAPABILITIES_PAGE,
						 MODE_SENSE_CURRENT);

	set_bit(PC_SUPPRESS_ERROR, &pc.flags);
	if (idefloppy_queue_pc_tail (drive,&pc)) {
		return 1;
	}

	header = (idefloppy_mode_parameter_header_t *) pc.buffer;
	page= (idefloppy_capabilities_page_t *)(header+1);
	floppy->srfp=page->srfp;
	return (0);
}

/*
 *	Determine if a media is present in the floppy drive, and if so,
 *	its LBA capacity.
 */
static int idefloppy_get_capacity (ide_drive_t *drive)
{
	idefloppy_floppy_t *floppy = drive->driver_data;
	idefloppy_pc_t pc;
	idefloppy_capacity_header_t *header;
	idefloppy_capacity_descriptor_t *descriptor;
	int i, descriptors, rc = 1, blocks, length;
	
	drive->bios_cyl = 0;
	drive->bios_head = drive->bios_sect = 0;
	floppy->blocks = floppy->bs_factor = 0;
	drive->part[0].nr_sects = 0;

	idefloppy_create_read_capacity_cmd (&pc);
	if (idefloppy_queue_pc_tail (drive, &pc)) {
		printk (KERN_ERR "ide-floppy: Can't get floppy parameters\n");
		return 1;
	}
	header = (idefloppy_capacity_header_t *) pc.buffer;
	descriptors = header->length / sizeof (idefloppy_capacity_descriptor_t);
	descriptor = (idefloppy_capacity_descriptor_t *) (header + 1);

	for (i = 0; i < descriptors; i++, descriptor++) {
                blocks = descriptor->blocks = ntohl (descriptor->blocks);
                length = descriptor->length = ntohs (descriptor->length);

		if (!i) 
		{
          	switch (descriptor->dc) {
                case CAPACITY_UNFORMATTED: /* Clik! drive returns this instead of CAPACITY_CURRENT */
                        if (!test_bit(IDEFLOPPY_CLIK_DRIVE, &floppy->flags))
                                break; /* If it is not a clik drive, break out (maintains previous driver behaviour) */
                case CAPACITY_CURRENT: /* Normal Zip/LS-120 disks */
                        if (memcmp (descriptor, &floppy->capacity, sizeof (idefloppy_capacity_descriptor_t)))
                                printk (KERN_INFO "%s: %dkB, %d blocks, %d sector size\n", drive->name, blocks * length / 1024, blocks, length);
                        floppy->capacity = *descriptor;
                        if (!length || length % 512)
                                printk (KERN_NOTICE "%s: %d bytes block size not supported\n", drive->name, length);
                        else {
                                floppy->blocks = blocks;
                                floppy->block_size = length;
                                if ((floppy->bs_factor = length / 512) != 1)
                                        printk (KERN_NOTICE "%s: warning: non 512 bytes block size not fully supported\n", drive->name);
                                rc = 0;
                        }
                        break;
                case CAPACITY_NO_CARTRIDGE:
                        /* This is a KERN_ERR so it appears on screen for the user to see */
                        printk (KERN_ERR "%s: No disk in drive\n", drive->name);
                                        break;
                case CAPACITY_INVALID:
                        printk (KERN_ERR "%s: Invalid capacity for disk in drive\n", drive->name);
                                        break;
		}
		}
		if (!i) {
		IDEFLOPPY_DEBUG( "Descriptor 0 Code: %d\n", descriptor->dc);
		}
		IDEFLOPPY_DEBUG( "Descriptor %d: %dkB, %d blocks, %d sector size\n", i, blocks * length / 1024, blocks, length);
	}

	/* Clik! disk does not support get_flexible_disk_page */
        if (!test_bit(IDEFLOPPY_CLIK_DRIVE, &floppy->flags))
	{
		(void) idefloppy_get_flexible_disk_page (drive);
	}

	drive->part[0].nr_sects = floppy->blocks * floppy->bs_factor;
	return rc;
}

/*
** Obtain the list of formattable capacities.
** Very similar to idefloppy_get_capacity, except that we push the capacity
** descriptors to userland, instead of our own structures.
**
** Userland gives us the following structure:
**
** struct idefloppy_format_capacities {
**        int nformats;
**        struct {
**                int nblocks;
**                int blocksize;
**                } formats[];
**        } ;
**
** userland initializes nformats to the number of allocated formats[]
** records.  On exit we set nformats to the number of records we've
** actually initialized.
**
*/

static int idefloppy_get_format_capacities (ide_drive_t *drive,
					    struct inode *inode,
					    struct file *file,
					    int *arg)	/* Cheater */
{
        idefloppy_pc_t pc;
	idefloppy_capacity_header_t *header;
        idefloppy_capacity_descriptor_t *descriptor;
	int i, descriptors, blocks, length;
	int u_array_size;
	int u_index;
	int *argp;

	if (get_user(u_array_size, arg))
		return (-EFAULT);

	if (u_array_size <= 0)
		return (-EINVAL);

	idefloppy_create_read_capacity_cmd (&pc);
	if (idefloppy_queue_pc_tail (drive, &pc)) {
		printk (KERN_ERR "ide-floppy: Can't get floppy parameters\n");
                return (-EIO);
        }
        header = (idefloppy_capacity_header_t *) pc.buffer;
        descriptors = header->length /
		sizeof (idefloppy_capacity_descriptor_t);
	descriptor = (idefloppy_capacity_descriptor_t *) (header + 1);

	u_index=0;
	argp=arg+1;

	/*
	** We always skip the first capacity descriptor.  That's the
	** current capacity.  We are interested in the remaining descriptors,
	** the formattable capacities.
	*/

	for (i=0; i<descriptors; i++, descriptor++)
	{
		if (u_index >= u_array_size)
			break;	/* User-supplied buffer too small */
		if (i == 0)
			continue;	/* Skip the first descriptor */

		blocks = ntohl (descriptor->blocks);
		length = ntohs (descriptor->length);

		if (put_user(blocks, argp))
			return (-EFAULT);
		++argp;

		if (put_user(length, argp))
			return (-EFAULT);
		++argp;

		++u_index;
	}

	if (put_user(u_index, arg))
		return (-EFAULT);
	return (0);
}

/*
** Send ATAPI_FORMAT_UNIT to the drive.
**
** Userland gives us the following structure:
**
** struct idefloppy_format_command {
**        int nblocks;
**        int blocksize;
**        int flags;
**        } ;
**
** flags is a bitmask, currently, the only defined flag is:
**
**        0x01 - verify media after format.
*/

static int idefloppy_begin_format(ide_drive_t *drive,
				  struct inode *inode,
				  struct file *file,
				  int *arg)
{
	int blocks;
	int length;
	int flags;
	idefloppy_pc_t pc;

	if (get_user(blocks, arg)
	    || get_user(length, arg+1)
	    || get_user(flags, arg+2))
	{
		return (-EFAULT);
	}

	(void) idefloppy_get_capability_page (drive);	/* Get the SFRP bit */
	idefloppy_create_format_unit_cmd(&pc, blocks, length, flags);
	if (idefloppy_queue_pc_tail (drive, &pc))
	{
                return (-EIO);
        }
	return (0);
}

/*
** Get ATAPI_FORMAT_UNIT progress indication.
**
** Userland gives a pointer to an int.  The int is set to a progresss
** indicator 0-65536, with 65536=100%.
**
** If the drive does not support format progress indication, we just check
** the dsc bit, and return either 0 or 65536.
*/

static int idefloppy_get_format_progress(ide_drive_t *drive,
					 struct inode *inode,
					 struct file *file,
					 int *arg)
{
	idefloppy_floppy_t *floppy = drive->driver_data;
	idefloppy_pc_t pc;
	int progress_indication=0x10000;

	if (floppy->srfp)
	{
		idefloppy_create_request_sense_cmd(&pc);
		if (idefloppy_queue_pc_tail (drive, &pc))
		{
			return (-EIO);
		}

		if (floppy->sense_key == 2 && floppy->asc == 4 &&
		    floppy->ascq == 4)
		{
			progress_indication=floppy->progress_indication;
		}