ide: add struct ide_taskfile (take 2)

* Don't set write-only ide_task_t.hobRegister[6] and ide_task_t.hobRegister[7]
  in idedisk_set_max_address_ext().

* Add struct ide_taskfile and use it in ide_task_t instead of tfRegister[]
  and hobRegister[].

* Remove no longer needed IDE_CONTROL_OFFSET_HOB define.

* Add #ifndef/#endif __KERNEL__ around definitions of {task,hob}_struct_t.

While at it:

* Use ATA_LBA define for LBA bit (0x40) as suggested by Tejun Heo.

v2:
* Add missing newlines. (Noticed by Sergei)

* Use ~ATA_LBA instead of 0xBF. (Noticed by Sergei)

* Use unnamed unions for error/feature and status/command.
  (Suggested by Sergei).

There should be no functionality changes caused by this patch.

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

1 files changed, 57 insertions, 63 deletions

diff --git a/drivers/ide/ide-disk.c b/drivers/ide/ide-disk.c
index 322c4691836a..a4c4d4350560 100644
--- a/drivers/ide/ide-disk.c
+++ b/drivers/ide/ide-disk.c
@@ -310,23 +310,22 @@ static ide_startstop_t ide_do_rw_disk (ide_drive_t *drive, struct request *rq, s
 static unsigned long idedisk_read_native_max_address(ide_drive_t *drive)
 {
         ide_task_t args;
+        struct ide_taskfile *tf = &args.tf;
         unsigned long addr = 0;
 
         /* Create IDE/ATA command request structure */
         memset(&args, 0, sizeof(ide_task_t));
-        args.tfRegister[IDE_SELECT_OFFSET]      = 0x40;
-        args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_READ_NATIVE_MAX;
+        tf->device  = ATA_LBA;
+        tf->command = WIN_READ_NATIVE_MAX;
         args.command_type                       = IDE_DRIVE_TASK_NO_DATA;
         args.handler                            = &task_no_data_intr;
         /* submit command request */
         ide_raw_taskfile(drive, &args, NULL);
 
         /* if OK, compute maximum address value */
-        if ((args.tfRegister[IDE_STATUS_OFFSET] & 0x01) == 0) {
-                addr = ((args.tfRegister[IDE_SELECT_OFFSET] & 0x0f) << 24)
-                     | ((args.tfRegister[  IDE_HCYL_OFFSET]       ) << 16)
-                     | ((args.tfRegister[  IDE_LCYL_OFFSET]       ) <<  8)
-                     | ((args.tfRegister[IDE_SECTOR_OFFSET]       ));
+        if ((tf->status & 0x01) == 0) {
+                addr = ((tf->device & 0xf) << 24) |
+                       (tf->lbah << 16) | (tf->lbam << 8) | tf->lbal;
                 addr++; /* since the return value is (maxlba - 1), we add 1 */
         }
         return addr;
@@ -335,26 +334,24 @@ static unsigned long idedisk_read_native_max_address(ide_drive_t *drive)
 static unsigned long long idedisk_read_native_max_address_ext(ide_drive_t *drive)
 {
         ide_task_t args;
+        struct ide_taskfile *tf = &args.tf;
         unsigned long long addr = 0;
 
         /* Create IDE/ATA command request structure */
         memset(&args, 0, sizeof(ide_task_t));
-
-        args.tfRegister[IDE_SELECT_OFFSET]      = 0x40;
-        args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_READ_NATIVE_MAX_EXT;
+        tf->device  = ATA_LBA;
+        tf->command = WIN_READ_NATIVE_MAX_EXT;
         args.command_type                       = IDE_DRIVE_TASK_NO_DATA;
         args.handler                            = &task_no_data_intr;
         /* submit command request */
         ide_raw_taskfile(drive, &args, NULL);
 
         /* if OK, compute maximum address value */
-        if ((args.tfRegister[IDE_STATUS_OFFSET] & 0x01) == 0) {
-                u32 high = (args.hobRegister[IDE_HCYL_OFFSET] << 16) |
-                           (args.hobRegister[IDE_LCYL_OFFSET] <<  8) |
-                            args.hobRegister[IDE_SECTOR_OFFSET];
-                u32 low  = ((args.tfRegister[IDE_HCYL_OFFSET])<<16) |
-                           ((args.tfRegister[IDE_LCYL_OFFSET])<<8) |
-                            (args.tfRegister[IDE_SECTOR_OFFSET]);
+        if ((tf->status & 0x01) == 0) {
+                u32 high, low;
+
+                high = (tf->hob_lbah << 16) | (tf->hob_lbam << 8) | tf->hob_lbal;
+                low  = (tf->lbah << 16) | (tf->lbam << 8) | tf->lbal;
                 addr = ((__u64)high << 24) | low;
                 addr++; /* since the return value is (maxlba - 1), we add 1 */
         }
@@ -368,26 +365,25 @@ static unsigned long long idedisk_read_native_max_address_ext(ide_drive_t *drive
 static unsigned long idedisk_set_max_address(ide_drive_t *drive, unsigned long addr_req)
 {
         ide_task_t args;
+        struct ide_taskfile *tf = &args.tf;
         unsigned long addr_set = 0;
         
         addr_req--;
         /* Create IDE/ATA command request structure */
         memset(&args, 0, sizeof(ide_task_t));
-        args.tfRegister[IDE_SECTOR_OFFSET]      = ((addr_req >>  0) & 0xff);
-        args.tfRegister[IDE_LCYL_OFFSET]        = ((addr_req >>  8) & 0xff);
-        args.tfRegister[IDE_HCYL_OFFSET]        = ((addr_req >> 16) & 0xff);
-        args.tfRegister[IDE_SELECT_OFFSET]      = ((addr_req >> 24) & 0x0f) | 0x40;
-        args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_SET_MAX;
+        tf->lbal    =  (addr_req >>  0) & 0xff;
+        tf->lbam    =  (addr_req >>  8) & 0xff;
+        tf->lbah    =  (addr_req >> 16) & 0xff;
+        tf->device  = ((addr_req >> 24) & 0x0f) | ATA_LBA;
+        tf->command = WIN_SET_MAX;
         args.command_type                       = IDE_DRIVE_TASK_NO_DATA;
         args.handler                            = &task_no_data_intr;
         /* submit command request */
         ide_raw_taskfile(drive, &args, NULL);
         /* if OK, read new maximum address value */
-        if ((args.tfRegister[IDE_STATUS_OFFSET] & 0x01) == 0) {
-                addr_set = ((args.tfRegister[IDE_SELECT_OFFSET] & 0x0f) << 24)
-                         | ((args.tfRegister[  IDE_HCYL_OFFSET]       ) << 16)
-                         | ((args.tfRegister[  IDE_LCYL_OFFSET]       ) <<  8)
-                         | ((args.tfRegister[IDE_SECTOR_OFFSET]       ));
+        if ((tf->status & 0x01) == 0) {
+                addr_set = ((tf->device & 0xf) << 24) |
+                           (tf->lbah << 16) | (tf->lbam << 8) | tf->lbal;
                 addr_set++;
         }
         return addr_set;
@@ -396,33 +392,30 @@ static unsigned long idedisk_set_max_address(ide_drive_t *drive, unsigned long a
 static unsigned long long idedisk_set_max_address_ext(ide_drive_t *drive, unsigned long long addr_req)
 {
         ide_task_t args;
+        struct ide_taskfile *tf = &args.tf;
         unsigned long long addr_set = 0;
 
         addr_req--;
         /* Create IDE/ATA command request structure */
         memset(&args, 0, sizeof(ide_task_t));
-        args.tfRegister[IDE_SECTOR_OFFSET]      = ((addr_req >>  0) & 0xff);
-        args.tfRegister[IDE_LCYL_OFFSET]        = ((addr_req >>= 8) & 0xff);
-        args.tfRegister[IDE_HCYL_OFFSET]        = ((addr_req >>= 8) & 0xff);
-        args.tfRegister[IDE_SELECT_OFFSET]      = 0x40;
-        args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_SET_MAX_EXT;
-        args.hobRegister[IDE_SECTOR_OFFSET]     = (addr_req >>= 8) & 0xff;
-        args.hobRegister[IDE_LCYL_OFFSET]       = (addr_req >>= 8) & 0xff;
-        args.hobRegister[IDE_HCYL_OFFSET]       = (addr_req >>= 8) & 0xff;
-        args.hobRegister[IDE_SELECT_OFFSET]     = 0x40;
-        args.hobRegister[IDE_CONTROL_OFFSET_HOB]= (drive->ctl|0x80);
+        tf->lbal     = (addr_req >>  0) & 0xff;
+        tf->lbam     = (addr_req >>= 8) & 0xff;
+        tf->lbah     = (addr_req >>= 8) & 0xff;
+        tf->device   = ATA_LBA;
+        tf->command  = WIN_SET_MAX_EXT;
+        tf->hob_lbal = (addr_req >>= 8) & 0xff;
+        tf->hob_lbam = (addr_req >>= 8) & 0xff;
+        tf->hob_lbah = (addr_req >>= 8) & 0xff;
         args.command_type                       = IDE_DRIVE_TASK_NO_DATA;
         args.handler                            = &task_no_data_intr;
         /* submit command request */
         ide_raw_taskfile(drive, &args, NULL);
         /* if OK, compute maximum address value */
-        if ((args.tfRegister[IDE_STATUS_OFFSET] & 0x01) == 0) {
-                u32 high = (args.hobRegister[IDE_HCYL_OFFSET] << 16) |
-                           (args.hobRegister[IDE_LCYL_OFFSET] <<  8) |
-                            args.hobRegister[IDE_SECTOR_OFFSET];
-                u32 low  = ((args.tfRegister[IDE_HCYL_OFFSET])<<16) |
-                           ((args.tfRegister[IDE_LCYL_OFFSET])<<8) |
-                            (args.tfRegister[IDE_SECTOR_OFFSET]);
+        if ((tf->status & 0x01) == 0) {
+                u32 high, low;
+
+                high = (tf->hob_lbah << 16) | (tf->hob_lbam << 8) | tf->hob_lbal;
+                low  = (tf->lbah << 16) | (tf->lbam << 8) | tf->lbal;
                 addr_set = ((__u64)high << 24) | low;
                 addr_set++;
         }
@@ -556,12 +549,13 @@ static sector_t idedisk_capacity (ide_drive_t *drive)
 static int smart_enable(ide_drive_t *drive)
 {
         ide_task_t args;
+        struct ide_taskfile *tf = &args.tf;
 
         memset(&args, 0, sizeof(ide_task_t));
-        args.tfRegister[IDE_FEATURE_OFFSET]     = SMART_ENABLE;
-        args.tfRegister[IDE_LCYL_OFFSET]        = SMART_LCYL_PASS;
-        args.tfRegister[IDE_HCYL_OFFSET]        = SMART_HCYL_PASS;
-        args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_SMART;
+        tf->feature = SMART_ENABLE;
+        tf->lbam    = SMART_LCYL_PASS;
+        tf->lbah    = SMART_HCYL_PASS;
+        tf->command = WIN_SMART;
         args.command_type                       = IDE_DRIVE_TASK_NO_DATA;
         args.handler                            = &task_no_data_intr;
         return ide_raw_taskfile(drive, &args, NULL);
@@ -570,13 +564,14 @@ static int smart_enable(ide_drive_t *drive)
 static int get_smart_data(ide_drive_t *drive, u8 *buf, u8 sub_cmd)
 {
         ide_task_t args;
+        struct ide_taskfile *tf = &args.tf;
 
         memset(&args, 0, sizeof(ide_task_t));
-        args.tfRegister[IDE_FEATURE_OFFSET]     = sub_cmd;
-        args.tfRegister[IDE_NSECTOR_OFFSET]     = 0x01;
-        args.tfRegister[IDE_LCYL_OFFSET]        = SMART_LCYL_PASS;
-        args.tfRegister[IDE_HCYL_OFFSET]        = SMART_HCYL_PASS;
-        args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_SMART;
+        tf->feature = sub_cmd;
+        tf->nsect   = 0x01;
+        tf->lbam    = SMART_LCYL_PASS;
+        tf->lbah    = SMART_HCYL_PASS;
+        tf->command = WIN_SMART;
         args.command_type                       = IDE_DRIVE_TASK_IN;
         args.data_phase                         = TASKFILE_IN;
         args.handler                            = &task_in_intr;
@@ -753,9 +748,9 @@ static int write_cache(ide_drive_t *drive, int arg)
 
         if (ide_id_has_flush_cache(drive->id)) {
                 memset(&args, 0, sizeof(ide_task_t));
-                args.tfRegister[IDE_FEATURE_OFFSET]     = (arg) ?
+                args.tf.feature = arg ?
                         SETFEATURES_EN_WCACHE : SETFEATURES_DIS_WCACHE;
-                args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_SETFEATURES;
+                args.tf.command = WIN_SETFEATURES;
                 args.command_type               = IDE_DRIVE_TASK_NO_DATA;
                 args.handler                    = &task_no_data_intr;
                 err = ide_raw_taskfile(drive, &args, NULL);
@@ -774,9 +769,9 @@ static int do_idedisk_flushcache (ide_drive_t *drive)
 
         memset(&args, 0, sizeof(ide_task_t));
         if (ide_id_has_flush_cache_ext(drive->id))
-                args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_FLUSH_CACHE_EXT;
+                args.tf.command = WIN_FLUSH_CACHE_EXT;
         else
-                args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_FLUSH_CACHE;
+                args.tf.command = WIN_FLUSH_CACHE;
         args.command_type                       = IDE_DRIVE_TASK_NO_DATA;
         args.handler                            = &task_no_data_intr;
         return ide_raw_taskfile(drive, &args, NULL);
@@ -790,10 +785,9 @@ static int set_acoustic (ide_drive_t *drive, int arg)
                 return -EINVAL;
 
         memset(&args, 0, sizeof(ide_task_t));
-        args.tfRegister[IDE_FEATURE_OFFSET]     = (arg) ? SETFEATURES_EN_AAM :
-                                                          SETFEATURES_DIS_AAM;
-        args.tfRegister[IDE_NSECTOR_OFFSET]     = arg;
-        args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_SETFEATURES;
+        args.tf.feature = arg ? SETFEATURES_EN_AAM : SETFEATURES_DIS_AAM;
+        args.tf.nsect   = arg;
+        args.tf.command = WIN_SETFEATURES;
         args.command_type = IDE_DRIVE_TASK_NO_DATA;
         args.handler      = &task_no_data_intr;
         ide_raw_taskfile(drive, &args, NULL);
@@ -1057,7 +1051,7 @@ static int idedisk_open(struct inode *inode, struct file *filp)
         if (drive->removable && idkp->openers == 1) {
                 ide_task_t args;
                 memset(&args, 0, sizeof(ide_task_t));
-                args.tfRegister[IDE_COMMAND_OFFSET] = WIN_DOORLOCK;
+                args.tf.command = WIN_DOORLOCK;
                 args.command_type = IDE_DRIVE_TASK_NO_DATA;
                 args.handler      = &task_no_data_intr;
                 check_disk_change(inode->i_bdev);
@@ -1084,7 +1078,7 @@ static int idedisk_release(struct inode *inode, struct file *filp)
         if (drive->removable && idkp->openers == 1) {
                 ide_task_t args;
                 memset(&args, 0, sizeof(ide_task_t));
-                args.tfRegister[IDE_COMMAND_OFFSET] = WIN_DOORUNLOCK;
+                args.tf.command = WIN_DOORUNLOCK;
                 args.command_type = IDE_DRIVE_TASK_NO_DATA;
                 args.handler      = &task_no_data_intr;
                 if (drive->doorlocking && ide_raw_taskfile(drive, &args, NULL))