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SubjectRe: [PATCH 2.6.11-rc2 02/04] ide: __ide_do_rw_disk() rewritten ide_write_taskfile().
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02_ide_do_rw_disk_use_write_taskfile.patch

__ide_do_rw_disk() rewritten using ide_write_taskfile().


Signed-off-by: Tejun Heo <tj@home-tj.org>


Index: linux-ide-series3-export/drivers/ide/ide-disk.c
===================================================================
--- linux-ide-series3-export.orig/drivers/ide/ide-disk.c 2005-02-06 19:48:58.744269198 +0900
+++ linux-ide-series3-export/drivers/ide/ide-disk.c 2005-02-06 19:49:19.141955368 +0900
@@ -119,118 +119,80 @@ static int lba_capacity_is_ok (struct hd
/*
* __ide_do_rw_disk() issues READ and WRITE commands to a disk,
* using LBA if supported, or CHS otherwise, to address sectors.
- * It also takes care of issuing special DRIVE_CMDs.
*/
-ide_startstop_t __ide_do_rw_disk (ide_drive_t *drive, struct request *rq, sector_t block)
+ide_startstop_t __ide_do_rw_disk(ide_drive_t *drive, struct request *rq, sector_t block)
{
- ide_hwif_t *hwif = HWIF(drive);
- unsigned int dma = drive->using_dma;
- u8 lba48 = (drive->addressing == 1) ? 1 : 0;
- task_ioreg_t command = WIN_NOP;
- ata_nsector_t nsectors;
-
- nsectors.all = (u16) rq->nr_sectors;
-
- if (hwif->no_lba48_dma && lba48 && dma) {
- if (block + rq->nr_sectors > 1ULL << 28)
- dma = 0;
- }
-
- if (!dma) {
- ide_init_sg_cmd(drive, rq);
- ide_map_sg(drive, rq);
- }
-
- if (IDE_CONTROL_REG)
- hwif->OUTB(drive->ctl, IDE_CONTROL_REG);
-
+ ide_hwif_t *hwif = drive->hwif;
+ unsigned long *ports = drive->hwif->io_ports;
+ int lba48 = drive->addressing == 1;
+ ide_task_t task;
+ task_ioreg_t *tf = task.tfRegister, *hob = task.hobRegister;
+ task_ioreg_t command;
+
+ /* ALL Command Block Executions SHALL clear nIEN. */
+ if (ports[IDE_CONTROL_OFFSET])
+ hwif->OUTB(drive->ctl, ports[IDE_CONTROL_OFFSET]);
/* FIXME: SELECT_MASK(drive, 0) ? */

- if (drive->select.b.lba) {
- if (drive->addressing == 1) {
- task_ioreg_t tasklets[10];
-
- pr_debug("%s: LBA=0x%012llx\n", drive->name, block);
+ memset(&task, 0, sizeof(task));

- tasklets[0] = 0;
- tasklets[1] = 0;
- tasklets[2] = nsectors.b.low;
- tasklets[3] = nsectors.b.high;
- tasklets[4] = (task_ioreg_t) block;
- tasklets[5] = (task_ioreg_t) (block>>8);
- tasklets[6] = (task_ioreg_t) (block>>16);
- tasklets[7] = (task_ioreg_t) (block>>24);
- if (sizeof(block) == 4) {
- tasklets[8] = (task_ioreg_t) 0;
- tasklets[9] = (task_ioreg_t) 0;
- } else {
- tasklets[8] = (task_ioreg_t)((u64)block >> 32);
- tasklets[9] = (task_ioreg_t)((u64)block >> 40);
- }
-#ifdef DEBUG
- printk("%s: 0x%02x%02x 0x%02x%02x%02x%02x%02x%02x\n",
- drive->name, tasklets[3], tasklets[2],
- tasklets[9], tasklets[8], tasklets[7],
- tasklets[6], tasklets[5], tasklets[4]);
-#endif
- hwif->OUTB(tasklets[1], IDE_FEATURE_REG);
- hwif->OUTB(tasklets[3], IDE_NSECTOR_REG);
- hwif->OUTB(tasklets[7], IDE_SECTOR_REG);
- hwif->OUTB(tasklets[8], IDE_LCYL_REG);
- hwif->OUTB(tasklets[9], IDE_HCYL_REG);
-
- hwif->OUTB(tasklets[0], IDE_FEATURE_REG);
- hwif->OUTB(tasklets[2], IDE_NSECTOR_REG);
- hwif->OUTB(tasklets[4], IDE_SECTOR_REG);
- hwif->OUTB(tasklets[5], IDE_LCYL_REG);
- hwif->OUTB(tasklets[6], IDE_HCYL_REG);
- hwif->OUTB(0x00|drive->select.all,IDE_SELECT_REG);
- } else {
- hwif->OUTB(0x00, IDE_FEATURE_REG);
- hwif->OUTB(nsectors.b.low, IDE_NSECTOR_REG);
- hwif->OUTB(block, IDE_SECTOR_REG);
- hwif->OUTB(block>>=8, IDE_LCYL_REG);
- hwif->OUTB(block>>=8, IDE_HCYL_REG);
- hwif->OUTB(((block>>8)&0x0f)|drive->select.all,IDE_SELECT_REG);
- }
+ if (drive->select.b.lba) {
+ /* LBA28/LBA48 */
+ tf[IDE_NSECTOR_OFFSET] = rq->nr_sectors;
+ tf[IDE_SECTOR_OFFSET] = block;
+ tf[IDE_LCYL_OFFSET] = block >> 8;
+ tf[IDE_HCYL_OFFSET] = block >> 16;
+
+ if (lba48) {
+ hob[IDE_NSECTOR_OFFSET] = rq->nr_sectors >> 8;
+ hob[IDE_SECTOR_OFFSET] = block >> 24;
+ hob[IDE_LCYL_OFFSET] = block >> 32;
+ hob[IDE_HCYL_OFFSET] = block >> 40;
+ } else
+ tf[IDE_SELECT_OFFSET] = (block >> 24) & 0xf;
} else {
- unsigned int sect,head,cyl,track;
- track = (int)block / drive->sect;
- sect = (int)block % drive->sect + 1;
- hwif->OUTB(sect, IDE_SECTOR_REG);
- head = track % drive->head;
- cyl = track / drive->head;
+ /* CHS */
+ task_ioreg_t track = (int)block / drive->sect;
+ task_ioreg_t cyl = track / drive->head;
+ task_ioreg_t head = track % drive->head;
+ task_ioreg_t sect = (int)block % drive->sect + 1;

pr_debug("%s: CHS=%u/%u/%u\n", drive->name, cyl, head, sect);
-
- hwif->OUTB(0x00, IDE_FEATURE_REG);
- hwif->OUTB(nsectors.b.low, IDE_NSECTOR_REG);
- hwif->OUTB(cyl, IDE_LCYL_REG);
- hwif->OUTB(cyl>>8, IDE_HCYL_REG);
- hwif->OUTB(head|drive->select.all,IDE_SELECT_REG);
- }
-
- if (dma) {
- if (!hwif->dma_setup(drive)) {
- if (rq_data_dir(rq)) {
- command = lba48 ? WIN_WRITEDMA_EXT : WIN_WRITEDMA;
- if (drive->vdma)
- command = lba48 ? WIN_WRITE_EXT: WIN_WRITE;
- } else {
- command = lba48 ? WIN_READDMA_EXT : WIN_READDMA;
- if (drive->vdma)
- command = lba48 ? WIN_READ_EXT: WIN_READ;
- }
- hwif->dma_exec_cmd(drive, command);
- hwif->dma_start(drive);
- return ide_started;
+ tf[IDE_NSECTOR_OFFSET] = rq->nr_sectors;
+ tf[IDE_SECTOR_OFFSET] = sect;
+ tf[IDE_LCYL_OFFSET] = cyl;
+ tf[IDE_HCYL_OFFSET] = cyl >> 8;
+ tf[IDE_SELECT_OFFSET] = head;
+ }
+
+ ide_write_taskfile(drive, &task);
+
+ if (drive->using_dma &&
+ !(hwif->no_lba48_dma && block + rq->nr_sectors > 1ULL << 28)) {
+ /* DMA */
+ if (hwif->dma_setup(drive))
+ goto fallback_to_pio;
+ if (rq_data_dir(rq) == READ) {
+ command = lba48 ? WIN_READDMA_EXT : WIN_READDMA;
+ if (drive->vdma)
+ command = lba48 ? WIN_READ_EXT : WIN_READ;
+ } else {
+ command = lba48 ? WIN_WRITEDMA_EXT : WIN_WRITEDMA;
+ if (drive->vdma)
+ command = lba48 ? WIN_WRITE_EXT : WIN_WRITE;
}
- /* fallback to PIO */
- ide_init_sg_cmd(drive, rq);
+ hwif->dma_exec_cmd(drive, command);
+ hwif->dma_start(drive);
+ return ide_started;
}

- if (rq_data_dir(rq) == READ) {
+ /* PIO */
+ ide_map_sg(drive, rq);
+ /* dma_setup() has already done ide_map_sg(). */
+ fallback_to_pio:
+ ide_init_sg_cmd(drive, rq);

+ if (rq_data_dir(rq) == READ) {
if (drive->mult_count) {
hwif->data_phase = TASKFILE_MULTI_IN;
command = lba48 ? WIN_MULTREAD_EXT : WIN_MULTREAD;
@@ -239,7 +201,8 @@ ide_startstop_t __ide_do_rw_disk (ide_dr
command = lba48 ? WIN_READ_EXT : WIN_READ;
}

- ide_execute_command(drive, command, &task_in_intr, WAIT_CMD, NULL);
+ ide_execute_command(drive, command, &task_in_intr,
+ WAIT_CMD, NULL);
return ide_started;
} else {
if (drive->mult_count) {
@@ -251,11 +214,11 @@ ide_startstop_t __ide_do_rw_disk (ide_dr
}

/* FIXME: ->OUTBSYNC ? */
- hwif->OUTB(command, IDE_COMMAND_REG);
-
+ hwif->OUTB(command, ports[IDE_COMMAND_OFFSET]);
return pre_task_out_intr(drive, rq);
}
}
+
EXPORT_SYMBOL_GPL(__ide_do_rw_disk);

/*
-
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