ide: add ide_transfer_pc() helper

* 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>

5 files changed, 80 insertions, 81 deletions

diff --git a/drivers/ide/Kconfig b/drivers/ide/Kconfig
index 1607536ff5fb..cf707c8f08d4 100644
--- a/drivers/ide/Kconfig
+++ b/drivers/ide/Kconfig
@@ -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
diff --git a/drivers/ide/Makefile b/drivers/ide/Makefile
index f94b679b611e..a2b3f84d710d 100644
--- a/drivers/ide/Makefile
+++ b/drivers/ide/Makefile
@@ -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
diff --git a/drivers/ide/ide-atapi.c b/drivers/ide/ide-atapi.c
new file mode 100644
index 000000000000..25939bc60402
--- /dev/null
+++ b/drivers/ide/ide-atapi.c
@@ -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);
diff --git a/drivers/ide/ide-floppy.c b/drivers/ide/ide-floppy.c
index a7c138dc324c..e7a1025c03c4 100644
--- a/drivers/ide/ide-floppy.c
+++ b/drivers/ide/ide-floppy.c
@@ -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,
diff --git a/drivers/ide/ide-tape.c b/drivers/ide/ide-tape.c
index 2a362138f973..5adc2c9ae418 100644
--- a/drivers/ide/ide-tape.c
+++ b/drivers/ide/ide-tape.c
@@ -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,