ide: add ide_tf_read() helper

* Factor out code reading taskfile registers from ide_end_drive_cmd()
  to the new ide_tf_read() helper.

* Add IDE_TFLAG_IN_* taskfile flags to indicate the need to load
  particular IDE taskfile register in ide_tf_read().

* Update ide_end_drive_cmd() to set respective IDE_TFLAG_IN_* taksfile flags.

* Add ide_get_lba_addr() for getting LBA sector address from taskfile struct.

* Factor out code getting sector address from ide_dump_ata_status()
  to the new ide_dump_sector() function.

* Convert ide_dump_sector() to use ide_tf_read() and ide_get_lba_addr().

* Remove no longer needed ide_read_24().

The only change in functionality caused by this patch is that
ide_dump_ata_status() no longer prints "high"/"low" parts of LBA48
sector address (of course LBA48 sector address is still printed).

Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

4 files changed, 106 insertions, 63 deletions

diff --git a/drivers/ide/ide-io.c b/drivers/ide/ide-io.c
index 48c38b68bd36..e053e00a7058 100644
--- a/drivers/ide/ide-io.c
+++ b/drivers/ide/ide-io.c
@@ -297,6 +297,48 @@ static void ide_complete_pm_request (ide_drive_t *drive, struct request *rq)
         spin_unlock_irqrestore(&ide_lock, flags);
 }
 
+void ide_tf_read(ide_drive_t *drive, ide_task_t *task)
+{
+        ide_hwif_t *hwif = drive->hwif;
+        struct ide_taskfile *tf = &task->tf;
+
+        if (task->tf_flags & IDE_TFLAG_IN_DATA) {
+                u16 data = hwif->INW(IDE_DATA_REG);
+
+                tf->data = data & 0xff;
+                tf->hob_data = (data >> 8) & 0xff;
+        }
+
+        /* be sure we're looking at the low order bits */
+        hwif->OUTB(drive->ctl & ~0x80, IDE_CONTROL_REG);
+
+        if (task->tf_flags & IDE_TFLAG_IN_NSECT)
+                tf->nsect  = hwif->INB(IDE_NSECTOR_REG);
+        if (task->tf_flags & IDE_TFLAG_IN_LBAL)
+                tf->lbal   = hwif->INB(IDE_SECTOR_REG);
+        if (task->tf_flags & IDE_TFLAG_IN_LBAM)
+                tf->lbam   = hwif->INB(IDE_LCYL_REG);
+        if (task->tf_flags & IDE_TFLAG_IN_LBAH)
+                tf->lbah   = hwif->INB(IDE_HCYL_REG);
+        if (task->tf_flags & IDE_TFLAG_IN_DEVICE)
+                tf->device = hwif->INB(IDE_SELECT_REG);
+
+        if (task->tf_flags & IDE_TFLAG_LBA48) {
+                hwif->OUTB(drive->ctl | 0x80, IDE_CONTROL_REG);
+
+                if (task->tf_flags & IDE_TFLAG_IN_HOB_FEATURE)
+                        tf->hob_feature = hwif->INB(IDE_FEATURE_REG);
+                if (task->tf_flags & IDE_TFLAG_IN_HOB_NSECT)
+                        tf->hob_nsect   = hwif->INB(IDE_NSECTOR_REG);
+                if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAL)
+                        tf->hob_lbal    = hwif->INB(IDE_SECTOR_REG);
+                if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAM)
+                        tf->hob_lbam    = hwif->INB(IDE_LCYL_REG);
+                if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAH)
+                        tf->hob_lbah    = hwif->INB(IDE_HCYL_REG);
+        }
+}
+
 /**
  *      ide_end_drive_cmd       -       end an explicit drive command
  *      @drive: command 
@@ -339,30 +381,14 @@ void ide_end_drive_cmd (ide_drive_t *drive, u8 stat, u8 err)
                 if (args) {
                         struct ide_taskfile *tf = &args->tf;
 
-                        if (args->tf_flags & IDE_TFLAG_IN_DATA) {
-                                u16 data = hwif->INW(IDE_DATA_REG);
-
-                                tf->data = data & 0xff;
-                                tf->hob_data = (data >> 8) & 0xff;
-                        }
                         tf->error = err;
-                        /* be sure we're looking at the low order bits */
-                        hwif->OUTB(drive->ctl & ~0x80, IDE_CONTROL_REG);
-                        tf->nsect  = hwif->INB(IDE_NSECTOR_REG);
-                        tf->lbal   = hwif->INB(IDE_SECTOR_REG);
-                        tf->lbam   = hwif->INB(IDE_LCYL_REG);
-                        tf->lbah   = hwif->INB(IDE_HCYL_REG);
-                        tf->device = hwif->INB(IDE_SELECT_REG);
                         tf->status = stat;
 
-                        if (args->tf_flags & IDE_TFLAG_LBA48) {
-                                hwif->OUTB(drive->ctl|0x80, IDE_CONTROL_REG);
-                                tf->hob_feature = hwif->INB(IDE_FEATURE_REG);
-                                tf->hob_nsect   = hwif->INB(IDE_NSECTOR_REG);
-                                tf->hob_lbal    = hwif->INB(IDE_SECTOR_REG);
-                                tf->hob_lbam    = hwif->INB(IDE_LCYL_REG);
-                                tf->hob_lbah    = hwif->INB(IDE_HCYL_REG);
-                        }
+                        args->tf_flags |= (IDE_TFLAG_IN_TF|IDE_TFLAG_IN_DEVICE);
+                        if (args->tf_flags & IDE_TFLAG_LBA48)
+                                args->tf_flags |= IDE_TFLAG_IN_HOB;
+
+                        ide_tf_read(drive, args);
                 }
         } else if (blk_pm_request(rq)) {
                 struct request_pm_state *pm = rq->data;
diff --git a/drivers/ide/ide-iops.c b/drivers/ide/ide-iops.c
index 38d6b15d6c47..c97c0719ddf1 100644
--- a/drivers/ide/ide-iops.c
+++ b/drivers/ide/ide-iops.c
@@ -158,14 +158,6 @@ void default_hwif_mmiops (ide_hwif_t *hwif)
 
 EXPORT_SYMBOL(default_hwif_mmiops);
 
-u32 ide_read_24 (ide_drive_t *drive)
-{
-        u8 sect = HWIF(drive)->INB(IDE_SECTOR_REG);
-        u8 lcyl = HWIF(drive)->INB(IDE_LCYL_REG);
-        u8 hcyl = HWIF(drive)->INB(IDE_HCYL_REG);
-        return (hcyl<<16)|(lcyl<<8)|sect;
-}
-
 void SELECT_DRIVE (ide_drive_t *drive)
 {
         if (HWIF(drive)->selectproc)
diff --git a/drivers/ide/ide-lib.c b/drivers/ide/ide-lib.c
index 001085845a79..15736d4ce9b4 100644
--- a/drivers/ide/ide-lib.c
+++ b/drivers/ide/ide-lib.c
@@ -479,6 +479,42 @@ static void ide_dump_opcode(ide_drive_t *drive)
                 printk("0x%02x\n", opcode);
 }
 
+static u64 ide_get_lba_addr(struct ide_taskfile *tf, int lba48)
+{
+        u32 high, low;
+
+        if (lba48)
+                high = (tf->hob_lbah << 16) | (tf->hob_lbam << 8) |
+                        tf->hob_lbal;
+        else
+                high = tf->device & 0xf;
+        low  = (tf->lbah << 16) | (tf->lbam << 8) | tf->lbal;
+
+        return ((u64)high << 24) | low;
+}
+
+static void ide_dump_sector(ide_drive_t *drive)
+{
+        ide_task_t task;
+        struct ide_taskfile *tf = &task.tf;
+        int lba48 = (drive->addressing == 1) ? 1 : 0;
+
+        memset(&task, 0, sizeof(task));
+        if (lba48)
+                task.tf_flags = IDE_TFLAG_IN_LBA | IDE_TFLAG_IN_HOB_LBA |
+                                IDE_TFLAG_LBA48;
+        else
+                task.tf_flags = IDE_TFLAG_IN_LBA | IDE_TFLAG_IN_DEVICE;
+
+        ide_tf_read(drive, &task);
+
+        if (lba48 || (tf->device & ATA_LBA))
+                printk(", LBAsect=%llu", ide_get_lba_addr(tf, lba48));
+        else
+                printk(", CHS=%d/%d/%d", (tf->lbah << 8) + tf->lbam,
+                                         tf->device & 0xf, tf->lbal);
+}
+
 static u8 ide_dump_ata_status(ide_drive_t *drive, const char *msg, u8 stat)
 {
         ide_hwif_t *hwif = HWIF(drive);
@@ -512,38 +548,7 @@ static u8 ide_dump_ata_status(ide_drive_t *drive, const char *msg, u8 stat)
                 printk("}");
                 if ((err & (BBD_ERR | ABRT_ERR)) == BBD_ERR ||
                     (err & (ECC_ERR|ID_ERR|MARK_ERR))) {
-                        if (drive->addressing == 1) {
-                                __u64 sectors = 0;
-                                u32 low = 0, high = 0;
-                                hwif->OUTB(drive->ctl&~0x80, IDE_CONTROL_REG);
-                                low = ide_read_24(drive);
-                                hwif->OUTB(drive->ctl|0x80, IDE_CONTROL_REG);
-                                high = ide_read_24(drive);
-                                sectors = ((__u64)high << 24) | low;
-                                printk(", LBAsect=%llu, high=%d, low=%d",
-                                       (unsigned long long) sectors,
-                                       high, low);
-                        } else {
-                                u8 sector, lcyl, hcyl, cur;
-
-                                sector = hwif->INB(IDE_SECTOR_REG);
-                                lcyl   = hwif->INB(IDE_LCYL_REG);
-                                hcyl   = hwif->INB(IDE_HCYL_REG);
-                                cur    = hwif->INB(IDE_SELECT_REG);
-
-                                if (cur & 0x40) {       /* using LBA? */
-                                        printk(", LBAsect=%ld", (unsigned long)
-                                                ((cur & 0xf) << 24) |
-                                                (hcyl << 16) |
-                                                (lcyl <<  8) |
-                                                sector);
-                                } else {
-                                        printk(", CHS=%d/%d/%d",
-                                                (hcyl << 8) + lcyl,
-                                                cur & 0xf,
-                                                sector);
-                                }
-                        }
+                        ide_dump_sector(drive);
                         if (HWGROUP(drive) && HWGROUP(drive)->rq)
                                 printk(", sector=%llu",
                                         (unsigned long long)HWGROUP(drive)->rq->sector);
diff --git a/include/linux/ide.h b/include/linux/ide.h
index c333a7528d94..67f98c096c03 100644
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -913,6 +913,27 @@ enum {
         IDE_TFLAG_IN_DATA               = (1 << 17),
         IDE_TFLAG_CUSTOM_HANDLER        = (1 << 18),
         IDE_TFLAG_DMA_PIO_FALLBACK      = (1 << 19),
+        IDE_TFLAG_IN_HOB_FEATURE        = (1 << 20),
+        IDE_TFLAG_IN_HOB_NSECT          = (1 << 21),
+        IDE_TFLAG_IN_HOB_LBAL           = (1 << 22),
+        IDE_TFLAG_IN_HOB_LBAM           = (1 << 23),
+        IDE_TFLAG_IN_HOB_LBAH           = (1 << 24),
+        IDE_TFLAG_IN_HOB_LBA            = IDE_TFLAG_IN_HOB_LBAL |
+                                          IDE_TFLAG_IN_HOB_LBAM |
+                                          IDE_TFLAG_IN_HOB_LBAH,
+        IDE_TFLAG_IN_HOB                = IDE_TFLAG_IN_HOB_FEATURE |
+                                          IDE_TFLAG_IN_HOB_NSECT |
+                                          IDE_TFLAG_IN_HOB_LBA,
+        IDE_TFLAG_IN_NSECT              = (1 << 25),
+        IDE_TFLAG_IN_LBAL               = (1 << 26),
+        IDE_TFLAG_IN_LBAM               = (1 << 27),
+        IDE_TFLAG_IN_LBAH               = (1 << 28),
+        IDE_TFLAG_IN_LBA                = IDE_TFLAG_IN_LBAL |
+                                          IDE_TFLAG_IN_LBAM |
+                                          IDE_TFLAG_IN_LBAH,
+        IDE_TFLAG_IN_TF                 = IDE_TFLAG_IN_NSECT |
+                                          IDE_TFLAG_IN_LBA,
+        IDE_TFLAG_IN_DEVICE             = (1 << 29),
 };
 
 struct ide_taskfile {
@@ -956,8 +977,7 @@ typedef struct ide_task_s {
 } ide_task_t;
 
 void ide_tf_load(ide_drive_t *, ide_task_t *);
-
-extern u32 ide_read_24(ide_drive_t *);
+void ide_tf_read(ide_drive_t *, ide_task_t *);
 
 extern void SELECT_DRIVE(ide_drive_t *);
 extern void SELECT_MASK(ide_drive_t *, int);