-#include <linux/config.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/string.h>
/**
* ide_dma_speed - compute DMA speed
* @drive: drive
- * @mode; intended mode
+ * @mode: modes available
*
* Checks the drive capabilities and returns the speed to use
- * for the transfer. Returns -1 if the requested mode is unknown
- * (eg PIO)
+ * for the DMA transfer. Returns 0 if the drive is incapable
+ * of DMA transfers.
*/
u8 ide_dma_speed(ide_drive_t *drive, u8 mode)
{
struct hd_driveid *id = drive->id;
ide_hwif_t *hwif = HWIF(drive);
+ u8 ultra_mask, mwdma_mask, swdma_mask;
u8 speed = 0;
if (drive->media != ide_disk && hwif->atapi_dma == 0)
return 0;
- switch(mode) {
- case 0x04:
- if ((id->dma_ultra & 0x0040) &&
- (id->dma_ultra & hwif->ultra_mask))
- { speed = XFER_UDMA_6; break; }
- case 0x03:
- if ((id->dma_ultra & 0x0020) &&
- (id->dma_ultra & hwif->ultra_mask))
- { speed = XFER_UDMA_5; break; }
- case 0x02:
- if ((id->dma_ultra & 0x0010) &&
- (id->dma_ultra & hwif->ultra_mask))
- { speed = XFER_UDMA_4; break; }
- if ((id->dma_ultra & 0x0008) &&
- (id->dma_ultra & hwif->ultra_mask))
- { speed = XFER_UDMA_3; break; }
- case 0x01:
- if ((id->dma_ultra & 0x0004) &&
- (id->dma_ultra & hwif->ultra_mask))
- { speed = XFER_UDMA_2; break; }
- if ((id->dma_ultra & 0x0002) &&
- (id->dma_ultra & hwif->ultra_mask))
- { speed = XFER_UDMA_1; break; }
- if ((id->dma_ultra & 0x0001) &&
- (id->dma_ultra & hwif->ultra_mask))
- { speed = XFER_UDMA_0; break; }
- case 0x00:
- if ((id->dma_mword & 0x0004) &&
- (id->dma_mword & hwif->mwdma_mask))
- { speed = XFER_MW_DMA_2; break; }
- if ((id->dma_mword & 0x0002) &&
- (id->dma_mword & hwif->mwdma_mask))
- { speed = XFER_MW_DMA_1; break; }
- if ((id->dma_mword & 0x0001) &&
- (id->dma_mword & hwif->mwdma_mask))
- { speed = XFER_MW_DMA_0; break; }
- if ((id->dma_1word & 0x0004) &&
- (id->dma_1word & hwif->swdma_mask))
- { speed = XFER_SW_DMA_2; break; }
- if ((id->dma_1word & 0x0002) &&
- (id->dma_1word & hwif->swdma_mask))
- { speed = XFER_SW_DMA_1; break; }
- if ((id->dma_1word & 0x0001) &&
- (id->dma_1word & hwif->swdma_mask))
- { speed = XFER_SW_DMA_0; break; }
- }
+ /* Capable of UltraDMA modes? */
+ ultra_mask = id->dma_ultra & hwif->ultra_mask;
+
+ if (!(id->field_valid & 4))
+ mode = 0; /* fallback to MW/SW DMA if no UltraDMA */
+
+ switch (mode) {
+ case 4:
+ if (ultra_mask & 0x40) {
+ speed = XFER_UDMA_6;
+ break;
+ }
+ case 3:
+ if (ultra_mask & 0x20) {
+ speed = XFER_UDMA_5;
+ break;
+ }
+ case 2:
+ if (ultra_mask & 0x10) {
+ speed = XFER_UDMA_4;
+ break;
+ }
+ if (ultra_mask & 0x08) {
+ speed = XFER_UDMA_3;
+ break;
+ }
+ case 1:
+ if (ultra_mask & 0x04) {
+ speed = XFER_UDMA_2;
+ break;
+ }
+ if (ultra_mask & 0x02) {
+ speed = XFER_UDMA_1;
+ break;
+ }
+ if (ultra_mask & 0x01) {
+ speed = XFER_UDMA_0;
+ break;
+ }
+ case 0:
+ mwdma_mask = id->dma_mword & hwif->mwdma_mask;
+
+ if (mwdma_mask & 0x04) {
+ speed = XFER_MW_DMA_2;
+ break;
+ }
+ if (mwdma_mask & 0x02) {
+ speed = XFER_MW_DMA_1;
+ break;
+ }
+ if (mwdma_mask & 0x01) {
+ speed = XFER_MW_DMA_0;
+ break;
+ }
-// printk("%s: %s: mode 0x%02x, speed 0x%02x\n",
-// __FUNCTION__, drive->name, mode, speed);
+ swdma_mask = id->dma_1word & hwif->swdma_mask;
+
+ if (swdma_mask & 0x04) {
+ speed = XFER_SW_DMA_2;
+ break;
+ }
+ if (swdma_mask & 0x02) {
+ speed = XFER_SW_DMA_1;
+ break;
+ }
+ if (swdma_mask & 0x01) {
+ speed = XFER_SW_DMA_0;
+ break;
+ }
+ }
return speed;
}
-
EXPORT_SYMBOL(ide_dma_speed);
EXPORT_SYMBOL(ide_dma_enable);
+int ide_use_fast_pio(ide_drive_t *drive)
+{
+ struct hd_driveid *id = drive->id;
+
+ if ((id->capability & 1) && drive->autodma)
+ return 1;
+
+ if ((id->capability & 8) || (id->field_valid & 2))
+ return 1;
+
+ return 0;
+}
+
+EXPORT_SYMBOL_GPL(ide_use_fast_pio);
+
/*
* Standard (generic) timings for PIO modes, from ATA2 specification.
* These timings are for access to the IDE data port register *only*.
int use_iordy = 0;
struct hd_driveid* id = drive->id;
int overridden = 0;
- int blacklisted = 0;
if (mode_wanted != 255) {
pio_mode = mode_wanted;
pio_mode = 0;
} else if ((pio_mode = ide_scan_pio_blacklist(id->model)) != -1) {
overridden = 1;
- blacklisted = 1;
use_iordy = (pio_mode > 2);
} else {
pio_mode = id->tPIO;
d->cycle_time = cycle_time ? cycle_time : ide_pio_timings[pio_mode].cycle_time;
d->use_iordy = use_iordy;
d->overridden = overridden;
- d->blacklisted = blacklisted;
}
return pio_mode;
}
return -1;
}
-EXPORT_SYMBOL_GPL(ide_set_xfer_rate);
-
static void ide_dump_opcode(ide_drive_t *drive)
{
struct request *rq;
spin_unlock(&ide_lock);
if (!rq)
return;
- if (rq->flags & (REQ_DRIVE_CMD | REQ_DRIVE_TASK)) {
+ if (rq->cmd_type == REQ_TYPE_ATA_CMD ||
+ rq->cmd_type == REQ_TYPE_ATA_TASK) {
char *args = rq->buffer;
if (args) {
opcode = args[0];
found = 1;
}
- } else if (rq->flags & REQ_DRIVE_TASKFILE) {
+ } else if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) {
ide_task_t *args = rq->special;
if (args) {
task_struct_t *tf = (task_struct_t *) args->tfRegister;
git.samba.org / sfrench / cifs-2.6.git / blobdiff