Initial import

1 files changed, 542 insertions, 0 deletions

diff --git a/drivers/ide/ide-floppy.c b/drivers/ide/ide-floppy.c
new file mode 100644
index 000000000..8c6363cdd
--- /dev/null
+++ b/drivers/ide/ide-floppy.c
@@ -0,0 +1,542 @@
+/*
+ * IDE ATAPI floppy driver.
+ *
+ * Copyright (C) 1996-1999  Gadi Oxman <gadio@netvision.net.il>
+ * Copyright (C) 2000-2002  Paul Bristow <paul@paulbristow.net>
+ * Copyright (C) 2005       Bartlomiej Zolnierkiewicz
+ *
+ * This driver supports the following IDE floppy drives:
+ *
+ * LS-120/240 SuperDisk
+ * Iomega Zip 100/250
+ * Iomega PC Card Clik!/PocketZip
+ *
+ * For a historical changelog see
+ * Documentation/ide/ChangeLog.ide-floppy.1996-2002
+ */
+
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/kernel.h>
+#include <linux/delay.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/cdrom.h>
+#include <linux/ide.h>
+#include <linux/hdreg.h>
+#include <linux/bitops.h>
+#include <linux/mutex.h>
+#include <linux/scatterlist.h>
+
+#include <scsi/scsi_ioctl.h>
+
+#include <asm/byteorder.h>
+#include <linux/uaccess.h>
+#include <linux/io.h>
+#include <asm/unaligned.h>
+
+#include "ide-floppy.h"
+
+/*
+ * After each failed packet command we issue a request sense command and retry
+ * the packet command IDEFLOPPY_MAX_PC_RETRIES times.
+ */
+#define IDEFLOPPY_MAX_PC_RETRIES	3
+
+/* format capacities descriptor codes */
+#define CAPACITY_INVALID	0x00
+#define CAPACITY_UNFORMATTED	0x01
+#define CAPACITY_CURRENT	0x02
+#define CAPACITY_NO_CARTRIDGE	0x03
+
+/*
+ * The following delay solves a problem with ATAPI Zip 100 drive where BSY bit
+ * was apparently being deasserted before the unit was ready to receive data.
+ */
+#define IDEFLOPPY_PC_DELAY	(HZ/20)	/* default delay for ZIP 100 (50ms) */
+
+static int ide_floppy_callback(ide_drive_t *drive, int dsc)
+{
+	struct ide_disk_obj *floppy = drive->driver_data;
+	struct ide_atapi_pc *pc = drive->pc;
+	struct request *rq = pc->rq;
+	int uptodate = pc->error ? 0 : 1;
+
+	ide_debug_log(IDE_DBG_FUNC, "enter");
+
+	if (drive->failed_pc == pc)
+		drive->failed_pc = NULL;
+
+	if (pc->c[0] == GPCMD_READ_10 || pc->c[0] == GPCMD_WRITE_10 ||
+	    rq->cmd_type == REQ_TYPE_BLOCK_PC)
+		uptodate = 1; /* FIXME */
+	else if (pc->c[0] == GPCMD_REQUEST_SENSE) {
+
+		u8 *buf = bio_data(rq->bio);
+
+		if (!pc->error) {
+			floppy->sense_key = buf[2] & 0x0F;
+			floppy->asc = buf[12];
+			floppy->ascq = buf[13];
+			floppy->progress_indication = buf[15] & 0x80 ?
+				(u16)get_unaligned((u16 *)&buf[16]) : 0x10000;
+
+			if (drive->failed_pc)
+				ide_debug_log(IDE_DBG_PC, "pc = %x",
+					      drive->failed_pc->c[0]);
+
+			ide_debug_log(IDE_DBG_SENSE, "sense key = %x, asc = %x,"
+				      "ascq = %x", floppy->sense_key,
+				      floppy->asc, floppy->ascq);
+		} else
+			printk(KERN_ERR PFX "Error in REQUEST SENSE itself - "
+			       "Aborting request!\n");
+	}
+
+	if (rq->cmd_type == REQ_TYPE_SPECIAL)
+		rq->errors = uptodate ? 0 : IDE_DRV_ERROR_GENERAL;
+
+	return uptodate;
+}
+
+static void ide_floppy_report_error(struct ide_disk_obj *floppy,
+				    struct ide_atapi_pc *pc)
+{
+	/* suppress error messages resulting from Medium not present */
+	if (floppy->sense_key == 0x02 &&
+	    floppy->asc       == 0x3a &&
+	    floppy->ascq      == 0x00)
+		return;
+
+	printk(KERN_ERR PFX "%s: I/O error, pc = %2x, key = %2x, "
+			"asc = %2x, ascq = %2x\n",
+			floppy->drive->name, pc->c[0], floppy->sense_key,
+			floppy->asc, floppy->ascq);
+
+}
+
+static ide_startstop_t ide_floppy_issue_pc(ide_drive_t *drive,
+					   struct ide_cmd *cmd,
+					   struct ide_atapi_pc *pc)
+{
+	struct ide_disk_obj *floppy = drive->driver_data;
+
+	if (drive->failed_pc == NULL &&
+	    pc->c[0] != GPCMD_REQUEST_SENSE)
+		drive->failed_pc = pc;
+
+	/* Set the current packet command */
+	drive->pc = pc;
+
+	if (pc->retries > IDEFLOPPY_MAX_PC_RETRIES) {
+		unsigned int done = blk_rq_bytes(drive->hwif->rq);
+
+		if (!(pc->flags & PC_FLAG_SUPPRESS_ERROR))
+			ide_floppy_report_error(floppy, pc);
+
+		/* Giving up */
+		pc->error = IDE_DRV_ERROR_GENERAL;
+
+		drive->failed_pc = NULL;
+		drive->pc_callback(drive, 0);
+		ide_complete_rq(drive, -EIO, done);
+		return ide_stopped;
+	}
+
+	ide_debug_log(IDE_DBG_FUNC, "retry #%d", pc->retries);
+
+	pc->retries++;
+
+	return ide_issue_pc(drive, cmd);
+}
+
+void ide_floppy_create_read_capacity_cmd(struct ide_atapi_pc *pc)
+{
+	ide_init_pc(pc);
+	pc->c[0] = GPCMD_READ_FORMAT_CAPACITIES;
+	pc->c[7] = 255;
+	pc->c[8] = 255;
+	pc->req_xfer = 255;
+}
+
+/* A mode sense command is used to "sense" floppy parameters. */
+void ide_floppy_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code)
+{
+	u16 length = 8; /* sizeof(Mode Parameter Header) = 8 Bytes */
+
+	ide_init_pc(pc);
+	pc->c[0] = GPCMD_MODE_SENSE_10;
+	pc->c[1] = 0;
+	pc->c[2] = page_code;
+
+	switch (page_code) {
+	case IDEFLOPPY_CAPABILITIES_PAGE:
+		length += 12;
+		break;
+	case IDEFLOPPY_FLEXIBLE_DISK_PAGE:
+		length += 32;
+		break;
+	default:
+		printk(KERN_ERR PFX "unsupported page code in %s\n", __func__);
+	}
+	put_unaligned(cpu_to_be16(length), (u16 *) &pc->c[7]);
+	pc->req_xfer = length;
+}
+
+static void idefloppy_create_rw_cmd(ide_drive_t *drive,
+				    struct ide_atapi_pc *pc, struct request *rq,
+				    unsigned long sector)
+{
+	struct ide_disk_obj *floppy = drive->driver_data;
+	int block = sector / floppy->bs_factor;
+	int blocks = blk_rq_sectors(rq) / floppy->bs_factor;
+	int cmd = rq_data_dir(rq);
+
+	ide_debug_log(IDE_DBG_FUNC, "block: %d, blocks: %d", block, blocks);
+
+	ide_init_pc(pc);
+	pc->c[0] = cmd == READ ? GPCMD_READ_10 : GPCMD_WRITE_10;
+	put_unaligned(cpu_to_be16(blocks), (unsigned short *)&pc->c[7]);
+	put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[2]);
+
+	memcpy(rq->cmd, pc->c, 12);
+
+	pc->rq = rq;
+	if (rq->cmd_flags & REQ_WRITE)
+		pc->flags |= PC_FLAG_WRITING;
+
+	pc->flags |= PC_FLAG_DMA_OK;
+}
+
+static void idefloppy_blockpc_cmd(struct ide_disk_obj *floppy,
+		struct ide_atapi_pc *pc, struct request *rq)
+{
+	ide_init_pc(pc);
+	memcpy(pc->c, rq->cmd, sizeof(pc->c));
+	pc->rq = rq;
+	if (blk_rq_bytes(rq)) {
+		pc->flags |= PC_FLAG_DMA_OK;
+		if (rq_data_dir(rq) == WRITE)
+			pc->flags |= PC_FLAG_WRITING;
+	}
+}
+
+static ide_startstop_t ide_floppy_do_request(ide_drive_t *drive,
+					     struct request *rq, sector_t block)
+{
+	struct ide_disk_obj *floppy = drive->driver_data;
+	struct ide_cmd cmd;
+	struct ide_atapi_pc *pc;
+
+	ide_debug_log(IDE_DBG_FUNC, "enter, cmd: 0x%x\n", rq->cmd[0]);
+
+	if (drive->debug_mask & IDE_DBG_RQ)
+		blk_dump_rq_flags(rq, (rq->rq_disk
+					? rq->rq_disk->disk_name
+					: "dev?"));
+
+	if (rq->errors >= ERROR_MAX) {
+		if (drive->failed_pc) {
+			ide_floppy_report_error(floppy, drive->failed_pc);
+			drive->failed_pc = NULL;
+		} else
+			printk(KERN_ERR PFX "%s: I/O error\n", drive->name);
+
+		if (rq->cmd_type == REQ_TYPE_SPECIAL) {
+			rq->errors = 0;
+			ide_complete_rq(drive, 0, blk_rq_bytes(rq));
+			return ide_stopped;
+		} else
+			goto out_end;
+	}
+
+	switch (rq->cmd_type) {
+	case REQ_TYPE_FS:
+		if (((long)blk_rq_pos(rq) % floppy->bs_factor) ||
+		    (blk_rq_sectors(rq) % floppy->bs_factor)) {
+			printk(KERN_ERR PFX "%s: unsupported r/w rq size\n",
+				drive->name);
+			goto out_end;
+		}
+		pc = &floppy->queued_pc;
+		idefloppy_create_rw_cmd(drive, pc, rq, (unsigned long)block);
+		break;
+	case REQ_TYPE_SPECIAL:
+	case REQ_TYPE_SENSE:
+		pc = (struct ide_atapi_pc *)rq->special;
+		break;
+	case REQ_TYPE_BLOCK_PC:
+		pc = &floppy->queued_pc;
+		idefloppy_blockpc_cmd(floppy, pc, rq);
+		break;
+	default:
+		BUG();
+	}
+
+	ide_prep_sense(drive, rq);
+
+	memset(&cmd, 0, sizeof(cmd));
+
+	if (rq_data_dir(rq))
+		cmd.tf_flags |= IDE_TFLAG_WRITE;
+
+	cmd.rq = rq;
+
+	if (rq->cmd_type == REQ_TYPE_FS || blk_rq_bytes(rq)) {
+		ide_init_sg_cmd(&cmd, blk_rq_bytes(rq));
+		ide_map_sg(drive, &cmd);
+	}
+
+	pc->rq = rq;
+
+	return ide_floppy_issue_pc(drive, &cmd, pc);
+out_end:
+	drive->failed_pc = NULL;
+	if (rq->cmd_type != REQ_TYPE_FS && rq->errors == 0)
+		rq->errors = -EIO;
+	ide_complete_rq(drive, -EIO, blk_rq_bytes(rq));
+	return ide_stopped;
+}
+
+/*
+ * Look at the flexible disk page parameters. We ignore the CHS capacity
+ * parameters and use the LBA parameters instead.
+ */
+static int ide_floppy_get_flexible_disk_page(ide_drive_t *drive,
+					     struct ide_atapi_pc *pc)
+{
+	struct ide_disk_obj *floppy = drive->driver_data;
+	struct gendisk *disk = floppy->disk;
+	u8 *page, buf[40];
+	int capacity, lba_capacity;
+	u16 transfer_rate, sector_size, cyls, rpm;
+	u8 heads, sectors;
+
+	ide_floppy_create_mode_sense_cmd(pc, IDEFLOPPY_FLEXIBLE_DISK_PAGE);
+
+	if (ide_queue_pc_tail(drive, disk, pc, buf, pc->req_xfer)) {
+		printk(KERN_ERR PFX "Can't get flexible disk page params\n");
+		return 1;
+	}
+
+	if (buf[3] & 0x80)
+		drive->dev_flags |= IDE_DFLAG_WP;
+	else
+		drive->dev_flags &= ~IDE_DFLAG_WP;
+
+	set_disk_ro(disk, !!(drive->dev_flags & IDE_DFLAG_WP));
+
+	page = &buf[8];
+
+	transfer_rate = be16_to_cpup((__be16 *)&buf[8 + 2]);
+	sector_size   = be16_to_cpup((__be16 *)&buf[8 + 6]);
+	cyls          = be16_to_cpup((__be16 *)&buf[8 + 8]);
+	rpm           = be16_to_cpup((__be16 *)&buf[8 + 28]);
+	heads         = buf[8 + 4];
+	sectors       = buf[8 + 5];
+
+	capacity = cyls * heads * sectors * sector_size;
+
+	if (memcmp(page, &floppy->flexible_disk_page, 32))
+		printk(KERN_INFO PFX "%s: %dkB, %d/%d/%d CHS, %d kBps, "
+				"%d sector size, %d rpm\n",
+				drive->name, capacity / 1024, cyls, heads,
+				sectors, transfer_rate / 8, sector_size, rpm);
+
+	memcpy(&floppy->flexible_disk_page, page, 32);
+	drive->bios_cyl = cyls;
+	drive->bios_head = heads;
+	drive->bios_sect = sectors;
+	lba_capacity = floppy->blocks * floppy->block_size;
+
+	if (capacity < lba_capacity) {
+		printk(KERN_NOTICE PFX "%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;
+		drive->capacity64 = floppy->blocks * floppy->bs_factor;
+	}
+
+	return 0;
+}
+
+/*
+ * Determine if a media is present in the floppy drive, and if so, its LBA
+ * capacity.
+ */
+static int ide_floppy_get_capacity(ide_drive_t *drive)
+{
+	struct ide_disk_obj *floppy = drive->driver_data;
+	struct gendisk *disk = floppy->disk;
+	struct ide_atapi_pc pc;
+	u8 *cap_desc;
+	u8 pc_buf[256], header_len, desc_cnt;
+	int i, rc = 1, blocks, length;
+
+	ide_debug_log(IDE_DBG_FUNC, "enter");
+
+	drive->bios_cyl = 0;
+	drive->bios_head = drive->bios_sect = 0;
+	floppy->blocks = 0;
+	floppy->bs_factor = 1;
+	drive->capacity64 = 0;
+
+	ide_floppy_create_read_capacity_cmd(&pc);
+	if (ide_queue_pc_tail(drive, disk, &pc, pc_buf, pc.req_xfer)) {
+		printk(KERN_ERR PFX "Can't get floppy parameters\n");
+		return 1;
+	}
+	header_len = pc_buf[3];
+	cap_desc = &pc_buf[4];
+	desc_cnt = header_len / 8; /* capacity descriptor of 8 bytes */
+
+	for (i = 0; i < desc_cnt; i++) {
+		unsigned int desc_start = 4 + i*8;
+
+		blocks = be32_to_cpup((__be32 *)&pc_buf[desc_start]);
+		length = be16_to_cpup((__be16 *)&pc_buf[desc_start + 6]);
+
+		ide_debug_log(IDE_DBG_PROBE, "Descriptor %d: %dkB, %d blocks, "
+					     "%d sector size",
+					     i, blocks * length / 1024,
+					     blocks, length);
+
+		if (i)
+			continue;
+		/*
+		 * the code below is valid only for the 1st descriptor, ie i=0
+		 */
+
+		switch (pc_buf[desc_start + 4] & 0x03) {
+		/* Clik! drive returns this instead of CAPACITY_CURRENT */
+		case CAPACITY_UNFORMATTED:
+			if (!(drive->atapi_flags & IDE_AFLAG_CLIK_DRIVE))
+				/*
+				 * If it is not a clik drive, break out
+				 * (maintains previous driver behaviour)
+				 */
+				break;
+		case CAPACITY_CURRENT:
+			/* Normal Zip/LS-120 disks */
+			if (memcmp(cap_desc, &floppy->cap_desc, 8))
+				printk(KERN_INFO PFX "%s: %dkB, %d blocks, %d "
+				       "sector size\n",
+				       drive->name, blocks * length / 1024,
+				       blocks, length);
+			memcpy(&floppy->cap_desc, cap_desc, 8);
+
+			if (!length || length % 512) {
+				printk(KERN_NOTICE PFX "%s: %d bytes block size"
+				       " not supported\n", drive->name, length);
+			} else {
+				floppy->blocks = blocks;
+				floppy->block_size = length;
+				floppy->bs_factor = length / 512;
+				if (floppy->bs_factor != 1)
+					printk(KERN_NOTICE PFX "%s: Warning: "
+					       "non 512 bytes block size not "
+					       "fully supported\n",
+					       drive->name);
+				drive->capacity64 =
+					floppy->blocks * floppy->bs_factor;
+				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 PFX "%s: No disk in drive\n",
+			       drive->name);
+			break;
+		case CAPACITY_INVALID:
+			printk(KERN_ERR PFX "%s: Invalid capacity for disk "
+				"in drive\n", drive->name);
+			break;
+		}
+		ide_debug_log(IDE_DBG_PROBE, "Descriptor 0 Code: %d",
+					     pc_buf[desc_start + 4] & 0x03);
+	}
+
+	/* Clik! disk does not support get_flexible_disk_page */
+	if (!(drive->atapi_flags & IDE_AFLAG_CLIK_DRIVE))
+		(void) ide_floppy_get_flexible_disk_page(drive, &pc);
+
+	return rc;
+}
+
+static void ide_floppy_setup(ide_drive_t *drive)
+{
+	struct ide_disk_obj *floppy = drive->driver_data;
+	u16 *id = drive->id;
+
+	drive->pc_callback	 = ide_floppy_callback;
+
+	/*
+	 * We used to check revisions here. At this point however I'm giving up.
+	 * Just assume they are all broken, its easier.
+	 *
+	 * The actual reason for the workarounds was likely a driver bug after
+	 * all rather than a firmware bug, and the workaround below used to hide
+	 * it. It should be fixed as of version 1.9, but to be on the safe side
+	 * we'll leave the limitation below for the 2.2.x tree.
+	 */
+	if (strstarts((char *)&id[ATA_ID_PROD], "IOMEGA ZIP 100 ATAPI")) {
+		drive->atapi_flags |= IDE_AFLAG_ZIP_DRIVE;
+		/* This value will be visible in the /proc/ide/hdx/settings */
+		drive->pc_delay = IDEFLOPPY_PC_DELAY;
+		blk_queue_max_hw_sectors(drive->queue, 64);
+	}
+
+	/*
+	 * Guess what? The IOMEGA Clik! drive also needs the above fix. It makes
+	 * nasty clicking noises without it, so please don't remove this.
+	 */
+	if (strstarts((char *)&id[ATA_ID_PROD], "IOMEGA Clik!")) {
+		blk_queue_max_hw_sectors(drive->queue, 64);
+		drive->atapi_flags |= IDE_AFLAG_CLIK_DRIVE;
+		/* IOMEGA Clik! drives do not support lock/unlock commands */
+		drive->dev_flags &= ~IDE_DFLAG_DOORLOCKING;
+	}
+
+	(void) ide_floppy_get_capacity(drive);
+
+	ide_proc_register_driver(drive, floppy->driver);
+
+	drive->dev_flags |= IDE_DFLAG_ATTACH;
+}
+
+static void ide_floppy_flush(ide_drive_t *drive)
+{
+}
+
+static int ide_floppy_init_media(ide_drive_t *drive, struct gendisk *disk)
+{
+	int ret = 0;
+
+	if (ide_do_test_unit_ready(drive, disk))
+		ide_do_start_stop(drive, disk, 1);
+
+	ret = ide_floppy_get_capacity(drive);
+
+	set_capacity(disk, ide_gd_capacity(drive));
+
+	return ret;
+}
+
+const struct ide_disk_ops ide_atapi_disk_ops = {
+	.check		= ide_check_atapi_device,
+	.get_capacity	= ide_floppy_get_capacity,
+	.setup		= ide_floppy_setup,
+	.flush		= ide_floppy_flush,
+	.init_media	= ide_floppy_init_media,
+	.set_doorlock	= ide_set_media_lock,
+	.do_request	= ide_floppy_do_request,
+	.ioctl		= ide_floppy_ioctl,
+};