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ide: add ide_transfer_pc() helper

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* 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>
This commit is contained in:
Bartlomiej Zolnierkiewicz
2008-07-15 21:21:58 +02:00
parent f83cbc77b0
commit 594c16d8dd
7 changed files with 85 additions and 109 deletions
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70
drivers/ide/ide-atapi.c Normal file
View File

@@ -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);