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ide: add ide_transfer_pc() helper

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* Add ide-atapi.c file for generic ATAPI support together with
  CONFIG_IDE_ATAPI config option.

* Add generic ide_transfer_pc() helper to ide-atapi.c and then
  convert ide-{floppy,tape,scsi} device drivers to use it.

There should be no functional changes caused by this patch.

Cc: Borislav Petkov <petkovbb@gmail.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
This commit is contained in:
Bartlomiej Zolnierkiewicz 2008-07-15 21:21:58 +02:00
parent f83cbc77b0
commit 594c16d8dd
7 changed files with 85 additions and 109 deletions
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6
drivers/ide/Kconfig
View File

@ -98,6 +98,9 @@ if BLK_DEV_IDE
comment "Please see Documentation/ide/ide.txt for help/info on IDE drives"
config IDE_ATAPI
bool
config BLK_DEV_IDE_SATA
bool "Support for SATA (deprecated; conflicts with libata SATA driver)"
default n
@ -201,6 +204,7 @@ config BLK_DEV_IDECD_VERBOSE_ERRORS
config BLK_DEV_IDETAPE
tristate "Include IDE/ATAPI TAPE support"
select IDE_ATAPI
help
If you have an IDE tape drive using the ATAPI protocol, say Y.
ATAPI is a newer protocol used by IDE tape and CD-ROM drives,
@ -223,6 +227,7 @@ config BLK_DEV_IDETAPE
config BLK_DEV_IDEFLOPPY
tristate "Include IDE/ATAPI FLOPPY support"
select IDE_ATAPI
---help---
If you have an IDE floppy drive which uses the ATAPI protocol,
answer Y. ATAPI is a newer protocol used by IDE CD-ROM/tape/floppy
@ -246,6 +251,7 @@ config BLK_DEV_IDEFLOPPY
config BLK_DEV_IDESCSI
tristate "SCSI emulation support"
depends on SCSI
select IDE_ATAPI
---help---
WARNING: ide-scsi is no longer needed for cd writing applications!
The 2.6 kernel supports direct writing to ide-cd, which eliminates

1
drivers/ide/Makefile
View File

@ -14,6 +14,7 @@ EXTRA_CFLAGS += -Idrivers/ide
ide-core-y += ide.o ide-io.o ide-iops.o ide-lib.o ide-probe.o ide-taskfile.o
# core IDE code
ide-core-$(CONFIG_IDE_ATAPI) += ide-atapi.o
ide-core-$(CONFIG_BLK_DEV_IDEPCI) += setup-pci.o
ide-core-$(CONFIG_BLK_DEV_IDEDMA) += ide-dma.o
ide-core-$(CONFIG_IDE_PROC_FS) += ide-proc.o

70
drivers/ide/ide-atapi.c Normal file
View File

@ -0,0 +1,70 @@
/*
* ATAPI support.
*/
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/ide.h>
static u8 ide_wait_ireason(ide_drive_t *drive, u8 ireason)
{
ide_hwif_t *hwif = drive->hwif;
int retries = 100;
while (retries-- && ((ireason & CD) == 0 || (ireason & IO))) {
printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
"a packet command, retrying\n", drive->name);
udelay(100);
ireason = hwif->INB(hwif->io_ports.nsect_addr);
if (retries == 0) {
printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
"a packet command, ignoring\n",
drive->name);
ireason |= CD;
ireason &= ~IO;
}
}
return ireason;
}
ide_startstop_t ide_transfer_pc(ide_drive_t *drive, struct ide_atapi_pc *pc,
ide_handler_t *handler, unsigned int timeout,
ide_expiry_t *expiry)
{
ide_hwif_t *hwif = drive->hwif;
ide_startstop_t startstop;
u8 ireason;
if (ide_wait_stat(&startstop, drive, DRQ_STAT, BUSY_STAT, WAIT_READY)) {
printk(KERN_ERR "%s: Strange, packet command initiated yet "
"DRQ isn't asserted\n", drive->name);
return startstop;
}
ireason = hwif->INB(hwif->io_ports.nsect_addr);
if (drive->media == ide_tape && !drive->scsi)
ireason = ide_wait_ireason(drive, ireason);
if ((ireason & CD) == 0 || (ireason & IO)) {
printk(KERN_ERR "%s: (IO,CoD) != (0,1) while issuing "
"a packet command\n", drive->name);
return ide_do_reset(drive);
}
/* Set the interrupt routine */
ide_set_handler(drive, handler, timeout, expiry);
/* Begin DMA, if necessary */
if (pc->flags & PC_FLAG_DMA_OK) {
pc->flags |= PC_FLAG_DMA_IN_PROGRESS;
hwif->dma_ops->dma_start(drive);
}
/* Send the actual packet */
if ((pc->flags & PC_FLAG_ZIP_DRIVE) == 0)
hwif->output_data(drive, NULL, pc->c, 12);
return ide_started;
}
EXPORT_SYMBOL_GPL(ide_transfer_pc);

28
drivers/ide/ide-floppy.c
View File

@ -532,25 +532,11 @@ static int idefloppy_transfer_pc2(ide_drive_t *drive)
static ide_startstop_t idefloppy_transfer_pc1(ide_drive_t *drive)
{
ide_hwif_t *hwif = drive->hwif;
idefloppy_floppy_t *floppy = drive->driver_data;
struct ide_atapi_pc *pc = floppy->pc;
ide_expiry_t *expiry;
unsigned int timeout;
ide_startstop_t startstop;
u8 ireason;
if (ide_wait_stat(&startstop, drive, DRQ_STAT, BUSY_STAT, WAIT_READY)) {
printk(KERN_ERR "%s: Strange, packet command initiated yet "
"DRQ isn't asserted\n", drive->name);
return startstop;
}
ireason = hwif->INB(hwif->io_ports.nsect_addr);
if ((ireason & CD) == 0 || (ireason & IO)) {
printk(KERN_ERR "%s: (IO,CoD) != (0,1) while issuing "
"a packet command\n", drive->name);
return ide_do_reset(drive);
}
/*
* The following delay solves a problem with ATAPI Zip 100 drives
* where the Busy flag was apparently being deasserted before the
@ -567,19 +553,7 @@ static ide_startstop_t idefloppy_transfer_pc1(ide_drive_t *drive)
expiry = NULL;
}
ide_set_handler(drive, &idefloppy_pc_intr, timeout, expiry);
/* Begin DMA, if necessary */
if (pc->flags & PC_FLAG_DMA_OK) {
pc->flags |= PC_FLAG_DMA_IN_PROGRESS;
hwif->dma_ops->dma_start(drive);
}
if ((pc->flags & PC_FLAG_ZIP_DRIVE) == 0)
/* Send the actual packet */
hwif->output_data(drive, NULL, floppy->pc->c, 12);
return ide_started;
return ide_transfer_pc(drive, pc, idefloppy_pc_intr, timeout, expiry);
}
static void ide_floppy_report_error(idefloppy_floppy_t *floppy,

56
drivers/ide/ide-tape.c
View File

@ -947,64 +947,12 @@ static ide_startstop_t idetape_pc_intr(ide_drive_t *drive)
* again, the callback function will be called and then we will handle the next
* request.
*/
static u8 ide_tape_wait_ireason(ide_drive_t *drive, u8 ireason)
{
ide_hwif_t *hwif = drive->hwif;
int retries = 100;
while (retries-- && ((ireason & CD) == 0 || (ireason & IO))) {
printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
"a packet command, retrying\n", drive->name);
udelay(100);
ireason = hwif->INB(hwif->io_ports.nsect_addr);
if (retries == 0) {
printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
"a packet command, ignoring\n",
drive->name);
ireason |= CD;
ireason &= ~IO;
}
}
return ireason;
}
static ide_startstop_t idetape_transfer_pc(ide_drive_t *drive)
{
ide_hwif_t *hwif = drive->hwif;
idetape_tape_t *tape = drive->driver_data;
struct ide_atapi_pc *pc = tape->pc;
ide_startstop_t startstop;
u8 ireason;
if (ide_wait_stat(&startstop, drive, DRQ_STAT, BUSY_STAT, WAIT_READY)) {
printk(KERN_ERR "%s: Strange, packet command initiated yet "
"DRQ isn't asserted\n", drive->name);
return startstop;
}
ireason = hwif->INB(hwif->io_ports.nsect_addr);
ireason = ide_tape_wait_ireason(drive, ireason);
if ((ireason & CD) == 0 || (ireason & IO)) {
printk(KERN_ERR "%s: (IO,CoD) != (0,1) while issuing "
"a packet command\n", drive->name);
return ide_do_reset(drive);
}
/* Set the interrupt routine */
ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL);
/* Begin DMA, if necessary */
if (pc->flags & PC_FLAG_DMA_OK) {
pc->flags |= PC_FLAG_DMA_IN_PROGRESS;
hwif->dma_ops->dma_start(drive);
}
/* Send the actual packet */
hwif->output_data(drive, NULL, pc->c, 12);
return ide_started;
return ide_transfer_pc(drive, tape->pc, idetape_pc_intr,
IDETAPE_WAIT_CMD, NULL);
}
static ide_startstop_t idetape_issue_pc(ide_drive_t *drive,

30
drivers/scsi/ide-scsi.c
View File

@ -453,36 +453,10 @@ static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
{
ide_hwif_t *hwif = drive->hwif;
idescsi_scsi_t *scsi = drive_to_idescsi(drive);
struct ide_atapi_pc *pc = scsi->pc;
ide_startstop_t startstop;
u8 ireason;
if (ide_wait_stat(&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) {
printk(KERN_ERR "%s: Strange, packet command initiated yet "
"DRQ isn't asserted\n", drive->name);
return startstop;
}
ireason = hwif->INB(hwif->io_ports.nsect_addr);
if ((ireason & CD) == 0 || (ireason & IO)) {
printk(KERN_ERR "%s: (IO,CoD) != (0,1) while issuing "
"a packet command\n", drive->name);
return ide_do_reset (drive);
}
/* Set the interrupt routine */
ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
if (pc->flags & PC_FLAG_DMA_OK) {
pc->flags |= PC_FLAG_DMA_IN_PROGRESS;
hwif->dma_ops->dma_start(drive);
}
/* Send the actual packet */
hwif->output_data(drive, NULL, scsi->pc->c, 12);
return ide_started;
return ide_transfer_pc(drive, scsi->pc, idescsi_pc_intr,
get_timeout(scsi->pc), idescsi_expiry);
}
static inline int idescsi_set_direction(struct ide_atapi_pc *pc)

3
include/linux/ide.h
View File

@ -967,6 +967,9 @@ extern int drive_is_ready(ide_drive_t *);
void ide_pktcmd_tf_load(ide_drive_t *, u32, u16, u8);
ide_startstop_t ide_transfer_pc(ide_drive_t *, struct ide_atapi_pc *,
ide_handler_t *, unsigned int, ide_expiry_t *);
ide_startstop_t do_rw_taskfile(ide_drive_t *, ide_task_t *);
void task_end_request(ide_drive_t *, struct request *, u8);