ide: add ide_transfer_pc() helper
Bartlomiej Zolnierkiewicz [Tue, 15 Jul 2008 19:21:58 +0000 (21:21 +0200)]
* 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>

drivers/ide/Kconfig
drivers/ide/Makefile
drivers/ide/ide-atapi.c [new file with mode: 0644]
drivers/ide/ide-floppy.c
drivers/ide/ide-tape.c
drivers/scsi/ide-scsi.c
include/linux/ide.h

index 1607536..cf707c8 100644 (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
index f94b679..a2b3f84 100644 (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
diff --git a/drivers/ide/ide-atapi.c b/drivers/ide/ide-atapi.c
new file mode 100644 (file)
index 0000000..25939bc
--- /dev/null
@@ -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);
index a7c138d..e7a1025 100644 (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,
index 2a36213..5adc2c9 100644 (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,
index c9fdf60..d41348f 100644 (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)
index 89feaea..bed3c58 100644 (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);