path: root/drivers/ide/ide-taskfile.c

/*
 * linux/drivers/ide/ide-taskfile.c	Version 0.38	March 05, 2003
 *
 *  Copyright (C) 2000-2002	Michael Cornwell <cornwell@acm.org>
 *  Copyright (C) 2000-2002	Andre Hedrick <andre@linux-ide.org>
 *  Copyright (C) 2001-2002	Klaus Smolin
 *					IBM Storage Technology Division
 *  Copyright (C) 2003-2004	Bartlomiej Zolnierkiewicz
 *
 *  The big the bad and the ugly.
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/timer.h>
#include <linux/mm.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/major.h>
#include <linux/errno.h>
#include <linux/genhd.h>
#include <linux/blkpg.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/hdreg.h>
#include <linux/ide.h>
#include <linux/bitops.h>
#include <linux/scatterlist.h>

#include <asm/byteorder.h>
#include <asm/irq.h>
#include <asm/uaccess.h>
#include <asm/io.h>

static void ata_bswap_data (void *buffer, int wcount)
{
	u16 *p = buffer;

	while (wcount--) {
		*p = *p << 8 | *p >> 8; p++;
		*p = *p << 8 | *p >> 8; p++;
	}
}

static void taskfile_input_data(ide_drive_t *drive, void *buffer, u32 wcount)
{
	HWIF(drive)->ata_input_data(drive, buffer, wcount);
	if (drive->bswap)
		ata_bswap_data(buffer, wcount);
}

static void taskfile_output_data(ide_drive_t *drive, void *buffer, u32 wcount)
{
	if (drive->bswap) {
		ata_bswap_data(buffer, wcount);
		HWIF(drive)->ata_output_data(drive, buffer, wcount);
		ata_bswap_data(buffer, wcount);
	} else {
		HWIF(drive)->ata_output_data(drive, buffer, wcount);
	}
}

void ide_tf_load(ide_drive_t *drive, ide_task_t *task)
{
	ide_hwif_t *hwif = drive->hwif;
	struct ide_taskfile *tf = &task->tf;
	u8 HIHI = (task->tf_flags & IDE_TFLAG_LBA48) ? 0xE0 : 0xEF;

	if (task->tf_flags & IDE_TFLAG_FLAGGED)
		HIHI = 0xFF;

#ifdef DEBUG
	printk("%s: tf: feat 0x%02x nsect 0x%02x lbal 0x%02x "
		"lbam 0x%02x lbah 0x%02x dev 0x%02x cmd 0x%02x\n",
		drive->name, tf->feature, tf->nsect, tf->lbal,
		tf->lbam, tf->lbah, tf->device, tf->command);
#endif

	if (IDE_CONTROL_REG)
		hwif->OUTB(drive->ctl, IDE_CONTROL_REG); /* clear nIEN */

	if ((task->tf_flags & IDE_TFLAG_NO_SELECT_MASK) == 0)
		SELECT_MASK(drive, 0);

	if (task->tf_flags & IDE_TFLAG_OUT_DATA)
		hwif->OUTW((tf->hob_data << 8) | tf->data, IDE_DATA_REG);

	if (task->tf_flags & IDE_TFLAG_OUT_HOB_FEATURE)
		hwif->OUTB(tf->hob_feature, IDE_FEATURE_REG);
	if (task->tf_flags & IDE_TFLAG_OUT_HOB_NSECT)
		hwif->OUTB(tf->hob_nsect, IDE_NSECTOR_REG);
	if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAL)
		hwif->OUTB(tf->hob_lbal, IDE_SECTOR_REG);
	if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAM)
		hwif->OUTB(tf->hob_lbam, IDE_LCYL_REG);
	if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAH)
		hwif->OUTB(tf->hob_lbah, IDE_HCYL_REG);

	if (task->tf_flags & IDE_TFLAG_OUT_FEATURE)
		hwif->OUTB(tf->feature, IDE_FEATURE_REG);
	if (task->tf_flags & IDE_TFLAG_OUT_NSECT)
		hwif->OUTB(tf->nsect, IDE_NSECTOR_REG);
	if (task->tf_flags & IDE_TFLAG_OUT_LBAL)
		hwif->OUTB(tf->lbal, IDE_SECTOR_REG);
	if (task->tf_flags & IDE_TFLAG_OUT_LBAM)
		hwif->OUTB(tf->lbam, IDE_LCYL_REG);
	if (task->tf_flags & IDE_TFLAG_OUT_LBAH)
		hwif->OUTB(tf->lbah, IDE_HCYL_REG);

	if (task->tf_flags & IDE_TFLAG_OUT_DEVICE)
		hwif->OUTB((tf->device & HIHI) | drive->select.all, IDE_SELECT_REG);
}

EXPORT_SYMBOL_GPL(ide_tf_load);

int taskfile_lib_get_identify (ide_drive_t *drive, u8 *buf)
{
	ide_task_t args;

	memset(&args, 0, sizeof(ide_task_t));
	args.tf.nsect = 0x01;
	if (drive->media == ide_disk)
		args.tf.command = WIN_IDENTIFY;
	else
		args.tf.command = WIN_PIDENTIFY;
	args.tf_flags = IDE_TFLAG_OUT_TF | IDE_TFLAG_OUT_DEVICE;
	args.command_type = IDE_DRIVE_TASK_IN;
	args.data_phase   = TASKFILE_IN;
	args.handler	  = &task_in_intr;
	return ide_raw_taskfile(drive, &args, buf);
}

static int inline task_dma_ok(ide_task_t *task)
{
	if (task->tf_flags & IDE_TFLAG_FLAGGED)
		return 1;

	switch (task->tf.command) {
		case WIN_WRITEDMA_ONCE:
		case WIN_WRITEDMA: