/*
* 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/slab.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/irq.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) */
/* Error code returned in rq->errors to the higher part of the driver. */
#define IDEFLOPPY_ERROR_GENERAL 101
/*
* Used to finish servicing a request. For read/write requests, we will call
* ide_end_request to pass to the next buffer.
*/
static int ide_floppy_end_request(ide_drive_t *drive, int uptodate, int nsecs)
{
struct ide_disk_obj *floppy = drive->driver_data;
struct request *rq = HWGROUP(drive)->rq;
int error;
ide_debug_log(IDE_DBG_FUNC, "Call %s\n", __func__);
switch (uptodate) {
case 0:
error = IDEFLOPPY_ERROR_GENERAL;
break;
case 1:
error = 0;
break;
default:
error = uptodate;
}
if (error)
floppy->failed_pc = NULL;
/* Why does this happen? */
if (!rq)
return 0;
if (!blk_special_request(rq)) {
/* our real local end request function */
ide_end_request(drive, uptodate, nsecs);
return 0;
}
rq->errors = error;
/* fixme: need to move this local also */
ide_end_drive_cmd(drive, 0, 0);
return 0;
}
static void idefloppy_update_buffers(ide_drive_t *drive,
struct ide_atapi_pc *pc)
{
struct request *rq = pc->rq;
struct bio *bio = rq->bio;
while ((bio = rq->bio) != NULL)
ide_floppy_end_request(drive, 1, 0);
}
static void ide_floppy_callback(ide_drive_t *drive, int dsc)
{
struct ide_disk_obj *floppy = drive->driver_data;
struct ide_atapi_pc *pc = drive->pc;
int uptodate = pc->error ? 0 : 1;
ide_debug_log(IDE_DBG_FUNC, "Call %s\n", __func__);
if (floppy->failed_pc == pc)
floppy->failed_pc = NULL;
if (pc->c[0] == GPCMD_READ_10 || pc->c[0] == GPCMD_WRITE_10 ||
(pc->rq && blk_pc_request(pc->rq)))
uptodate = 1; /* FIXME */
else if (pc->c[0] == GPCMD_REQUEST_SENSE) {
u8 *buf = pc->buf;
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 (floppy->failed_pc)
ide_debug_log(IDE_DBG_PC, "pc = %x, ",
floppy->failed_pc->c[0]);
ide_debug_log(IDE_DBG_SENSE, "sense key = %x, asc = %x,"
"ascq = %x\n", floppy->sense_key,
floppy->asc, floppy->ascq);
} else
printk(KERN_ERR PFX "Error in REQUEST SENSE itself - "
"Aborting request!\n");
}
ide_floppy_end_request(drive, uptodate, 0);
}
static void ide_floppy_report_error(struct ide_disk_obj *floppy,
struct ide_atapi_pc *pc)
{
/* supress 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 idefloppy_issue_pc(ide_drive_t *drive,
struct ide_atapi_pc *pc)
{
struct ide_disk_obj *floppy = drive->driver_data;
if (floppy->failed_pc == NULL &&
pc->c[0] != GPCMD_REQUEST_SENSE)
floppy->failed_pc = pc;
/* Set the current packet command */
drive->pc = pc;
if (pc->retries > IDEFLOPPY_MAX_PC_RETRIES) {
if (!(pc->flags & PC_FLAG_SUPPRESS_ERROR))
ide_floppy_report_error(floppy, pc);
/* Giving up */
pc->error = IDEFLOPPY_ERROR_GENERAL;
floppy->failed_pc = NULL;
drive->pc_callback(drive, 0);
return ide_stopped;
}
ide_debug_log(IDE_DBG_FUNC, "%s: Retry #%d\n", __func__, pc->retries);
pc->retries++;
return ide_issue_pc(drive);
}
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 = rq->nr_sectors / floppy->bs_factor;
int cmd = rq_data_dir(rq);
ide_debug_log(IDE_DBG_FUNC, "%s: block: %d, blocks: %d\n", __func__,
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;
pc->b_count = 0;
if (rq->cmd_flags & REQ_RW)
pc->flags |= PC_FLAG_WRITING;
pc->buf = NULL;
pc->req_xfer = pc->buf_size = blocks * floppy->block_size;
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;
pc->b_count = 0;
if (rq->data_len && rq_data_dir(rq) == WRITE)
pc->flags |= PC_FLAG_WRITING;
pc->buf = rq->data;
if (rq->bio)
pc->flags |= PC_FLAG_DMA_OK;
/*
* possibly problematic, doesn't look like ide-floppy correctly
* handled scattered requests if dma fails...
*/
pc->req_xfer = pc->buf_size = rq->data_len;
}
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;
ide_hwif_t *hwif = drive->hwif;
struct ide_atapi_pc *pc;
ide_debug_log(IDE_DBG_FUNC, "%s: dev: %s, cmd: 0x%x, cmd_type: %x, "
"errors: %d\n",
__func__, rq->rq_disk ? rq->rq_disk->disk_name : "?",
rq->cmd[0], rq->cmd_type, rq->errors);
ide_debug_log(IDE_DBG_FUNC, "%s: sector: %ld, nr_sectors: %ld, "
"current_nr_sectors: %d\n",
__func__, (long)rq->sector, rq->nr_sectors,
rq->current_nr_sectors);
if (rq->errors >= ERROR_MAX) {
if (floppy->failed_pc)
ide_floppy_report_error(floppy, floppy->failed_pc);
else
printk(KERN_ERR PFX "%s: I/O error\n", drive->name);
ide_floppy_end_request(drive, 0, 0);
return ide_stopped;
}
if (blk_fs_request(rq)) {
if (((long)rq->sector % floppy->bs_factor) ||
(rq->nr_sectors % floppy->bs_factor)) {
printk(KERN_ERR PFX "%s: unsupported r/w rq size\n",
drive->name);
ide_floppy_end_request(drive, 0, 0);
return ide_stopped;
}
pc = &floppy->queued_pc;
idefloppy_create_rw_cmd(drive, pc, rq, (unsigned long)block);
} else if (blk_special_request(rq)) {
pc = (struct ide_atapi_pc *) rq->buffer;
} else if (blk_pc_request(rq)) {
pc = &floppy->queued_pc;
idefloppy_blockpc_cmd(floppy, pc, rq);
} else {
blk_dump_rq_flags(rq, PFX "unsupported command in queue");
ide_floppy_end_request(drive, 0, 0);
return ide_stopped;
}
ide_init_sg_cmd(drive, rq);
ide_map_sg(drive, rq);
pc->sg = hwif->sg_table;
pc->sg_cnt = hwif->sg_nents;
pc->rq = rq;
return idefloppy_issue_pc(drive, pc);
}
/*
* 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;
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)) {
printk(KERN_ERR PFX "Can't get flexible disk page params\n");
return 1;
}
if (pc->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 = &pc->buf[8];
transfer_rate = be16_to_cpup((__be16 *)&pc->buf[8 + 2]);
sector_size = be16_to_cpup((__be16 *)&pc->buf[8 + 6]);
cyls = be16_to_cpup((__be16 *)&pc->buf[8 + 8]);
rpm = be16_to_cpup((__be16 *)&pc->buf[8 + 28]);
heads = pc->buf[8 + 4];
sectors = pc->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 header_len, desc_cnt;
int i, rc = 1, blocks, length;
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)) {
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\n",
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\n",
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;
drive->pc_update_buffers = idefloppy_update_buffers;
drive->pc_io_buffers = ide_io_buffers;
/*
* 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 (!strncmp((char *)&id[ATA_ID_PROD], "IOMEGA ZIP 100 ATAPI", 20)) {
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_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 (strncmp((char *)&id[ATA_ID_PROD], "IOMEGA Clik!", 11) == 0) {
blk_queue_max_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,
.end_request = ide_floppy_end_request,
.ioctl = ide_floppy_ioctl,
};
