[GitHub/exynos8895/android_kernel_samsung_universal8895.git] / drivers / ide / ide-taskfile.c

/*
 *  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, 2007  Bartlomiej Zolnierkiewicz
 *
 *  The big the bad and the ugly.
 */

#include <linux/types.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/export.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/hdreg.h>
#include <linux/ide.h>
#include <linux/scatterlist.h>
#include <linux/uaccess.h>

#include <asm/io.h>

void ide_tf_readback(ide_drive_t *drive, struct ide_cmd *cmd)
{
	ide_hwif_t *hwif = drive->hwif;
	const struct ide_tp_ops *tp_ops = hwif->tp_ops;

	/* Be sure we're looking at the low order bytes */
	tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS);

	tp_ops->tf_read(drive, &cmd->tf, cmd->valid.in.tf);

	if (cmd->tf_flags & IDE_TFLAG_LBA48) {
		tp_ops->write_devctl(hwif, ATA_HOB | ATA_DEVCTL_OBS);

		tp_ops->tf_read(drive, &cmd->hob, cmd->valid.in.hob);
	}
}

void ide_tf_dump(const char *s, struct ide_cmd *cmd)
{
#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",
	       s, cmd->tf.feature, cmd->tf.nsect,
	       cmd->tf.lbal, cmd->tf.lbam, cmd->tf.lbah,
	       cmd->tf.device, cmd->tf.command);
	printk("%s: hob: nsect 0x%02x lbal 0x%02x lbam 0x%02x lbah 0x%02x\n",
	       s, cmd->hob.nsect, cmd->hob.lbal, cmd->hob.lbam, cmd->hob.lbah);
#endif
}

int taskfile_lib_get_identify(ide_drive_t *drive, u8 *buf)
{
	struct ide_cmd cmd;

	memset(&cmd, 0, sizeof(cmd));
	cmd.tf.nsect = 0x01;
	if (drive->media == ide_disk)
		cmd.tf.command = ATA_CMD_ID_ATA;
	else
		cmd.tf.command = ATA_CMD_ID_ATAPI;
	cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
	cmd.valid.in.tf  = IDE_VALID_IN_TF  | IDE_VALID_DEVICE;
	cmd.protocol = ATA_PROT_PIO;

	return ide_raw_taskfile(drive, &cmd, buf, 1);
}

static ide_startstop_t task_no_data_intr(ide_drive_t *);
static ide_startstop_t pre_task_out_intr(ide_drive_t *, struct ide_cmd *);
static ide_startstop_t task_pio_intr(ide_drive_t *);

ide_startstop_t do_rw_taskfile(ide_drive_t *drive, struct ide_cmd *orig_cmd)
{
	ide_hwif_t *hwif = drive->hwif;
	struct ide_cmd *cmd = &hwif->cmd;
	struct ide_taskfile *tf = &cmd->tf;
	ide_handler_t *handler = NULL;
	const struct ide_tp_ops *tp_ops = hwif->tp_ops;
	const struct ide_dma_ops *dma_ops = hwif->dma_ops;

	if (orig_cmd->protocol == ATA_PROT_PIO &&
	    (orig_cmd->tf_flags & IDE_TFLAG_MULTI_PIO) &&
	    drive->mult_count == 0) {
		pr_err("%s: multimode not set!\n", drive->name);
		return ide_stopped;
	}

	if (orig_cmd->ftf_flags & IDE_FTFLAG_FLAGGED)
		orig_cmd->ftf_flags |= IDE_FTFLAG_SET_IN_FLAGS;

	memcpy(cmd, orig_cmd, sizeof(*cmd));

	if ((cmd->tf_flags & IDE_TFLAG_DMA_PIO_FALLBACK) == 0) {
		ide_tf_dump(drive->name, cmd);
		tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS);

		if (cmd->ftf_flags & IDE_FTFLAG_OUT_DATA) {
			u8 data[2] = { cmd->tf.data, cmd->hob.data };

			tp_ops->output_data(drive, cmd, data, 2);
		}

		if (cmd->valid.out.tf & IDE_VALID_DEVICE) {
			u8 HIHI = (cmd->tf_flags & IDE_TFLAG_LBA48) ?
				  0xE0 : 0xEF;

			if (!(cmd->ftf_flags & IDE_FTFLAG_FLAGGED))
				cmd->tf.device &= HIHI;
			cmd->tf.device |= drive->select;
		}

		tp_ops->tf_load(drive, &cmd->hob, cmd->valid.out.hob);
		tp_ops->tf_load(drive, &cmd->tf,  cmd->valid.out.tf);
	}

	switch (cmd->protocol) {
	case ATA_PROT_PIO:
		if (cmd->tf_flags & IDE_TFLAG_WRITE) {
			tp_ops->exec_command(hwif, tf->command);
			ndelay(400);	/* FIXME */
			return pre_task_out_intr(drive, cmd);
		}
		handler = task_pio_intr;
		/* fall-through */
	case ATA_PROT_NODATA:
		if (handler == NULL)
			handler = task_no_data_intr;
		ide_execute_command(drive, cmd, handler, WAIT_WORSTCASE);
		return ide_started;
	case ATA_PROT_DMA:
		if (ide_dma_prepare(drive, cmd))
			return ide_stopped;
		hwif->expiry = dma_ops->dma_timer_expiry;
		ide_execute_command(drive, cmd, ide_dma_intr, 2 * WAIT_CMD);
		dma_ops->dma_start(drive);
	default:
		return ide_started;
	}
}
EXPORT_SYMBOL_GPL(do_rw_taskfile);

static ide_startstop_t task_no_data_intr(ide_drive_t *drive)
{
	ide_hwif_t *hwif = drive->hwif;
	struct ide_cmd *cmd = &hwif->cmd;
	struct ide_taskfile *tf = &cmd->tf;
	int custom = (cmd->tf_flags & IDE_TFLAG_CUSTOM_HANDLER) ? 1 : 0;
	int retries = (custom && tf->command == ATA_CMD_INIT_DEV_PARAMS) ? 5 : 1;
	u8 stat;

	local_irq_enable_in_hardirq();

	while (1) {
		stat = hwif->tp_ops->read_status(hwif);
		if ((stat & ATA_BUSY) == 0 || retries-- == 0)
			break;
		udelay(10);
	};

	if (!OK_STAT(stat, ATA_DRDY, BAD_STAT)) {
		if (custom && tf->command == ATA_CMD_SET_MULTI) {
			drive->mult_req = drive->mult_count = 0;
			drive->special_flags |= IDE_SFLAG_RECALIBRATE;
			(void)ide_dump_status(drive, __func__, stat);
			return ide_stopped;
		} else if (custom && tf->command == ATA_CMD_INIT_DEV_PARAMS) {
			if ((stat & (ATA_ERR | ATA_DRQ)) == 0) {
				ide_set_handler(drive, &task_no_data_intr,
						WAIT_WORSTCASE);
				return ide_started;
			}
		}
		return ide_error(drive, "task_no_data_intr", stat);
	}

	if (custom && tf->command == ATA_CMD_SET_MULTI)
		drive->mult_count = drive->mult_req;

	if (custom == 0 || tf->command == ATA_CMD_IDLEIMMEDIATE ||
	    tf->command == ATA_CMD_CHK_POWER) {
		struct request *rq = hwif->rq;

		if (ata_pm_request(rq))
			ide_complete_pm_rq(drive, rq);
		else
			ide_finish_cmd(drive, cmd, stat);
	}

	return ide_stopped;
}

static u8 wait_drive_not_busy(ide_drive_t *drive)
{
	ide_hwif_t *hwif = drive->hwif;
	int retries;
	u8 stat;

	/*
	 * Last sector was transferred, wait until device is ready.  This can
	 * take up to 6 ms on some ATAPI devices, so we will wait max 10 ms.
	 */
	for (retries = 0; retries < 1000; retries++) {
		stat = hwif->tp_ops->read_status(hwif);

		if (stat & ATA_BUSY)
			udelay(10);
		else
			break;
	}

	if (stat & ATA_BUSY)
		pr_err("%s: drive still BUSY!\n", drive->name);

	return stat;
}

void ide_pio_bytes(ide_drive_t *drive, struct ide_cmd *cmd,
		   unsigned int write, unsigned int len)
{
	ide_hwif_t *hwif = drive->hwif;
	struct scatterlist *sg = hwif->sg_table;
	struct scatterlist *cursg = cmd->cursg;
	unsigned long uninitialized_var(flags);
	struct page *page;
	unsigned int offset;
	u8 *buf;

	cursg = cmd->cursg;
	if (cursg == NULL)
		cursg = cmd->cursg = sg;

	while (len) {
		unsigned nr_bytes = min(len, cursg->length - cmd->cursg_ofs);
		int page_is_high;

		page = sg_page(cursg);
		offset = cursg->offset + cmd->cursg_ofs;

		/* get the current page and offset */
		page = nth_page(page, (offset >> PAGE_SHIFT));
		offset %= PAGE_SIZE;

		nr_bytes = min_t(unsigned, nr_bytes, (PAGE_SIZE - offset));

		page_is_high = PageHighMem(page);
		if (page_is_high)
			local_irq_save(flags);

		buf = kmap_atomic(page) + offset;

		cmd->nleft -= nr_bytes;
		cmd->cursg_ofs += nr_bytes;

		if (cmd->cursg_ofs == cursg->length) {
			cursg = cmd->cursg = sg_next(cmd->cursg);
			cmd->cursg_ofs = 0;
		}

		/* do the actual data transfer */
		if (write)
			hwif->tp_ops->output_data(drive, cmd, buf, nr_bytes);
		else
			hwif->tp_ops->input_data(drive, cmd, buf, nr_bytes);

		kunmap_atomic(buf);

		if (page_is_high)
			local_irq_restore(flags);

		len -= nr_bytes;
	}
}
EXPORT_SYMBOL_GPL(ide_pio_bytes);

static void ide_pio_datablock(ide_drive_t *drive, struct ide_cmd *cmd,
			      unsigned int write)
{
	unsigned int nr_bytes;

	u8 saved_io_32bit = drive->io_32bit;

	if (cmd->tf_flags & IDE_TFLAG_FS)
		cmd->rq->errors = 0;

	if (cmd->tf_flags & IDE_TFLAG_IO_16BIT)
		drive->io_32bit = 0;

	touch_softlockup_watchdog();

	if (cmd->tf_flags & IDE_TFLAG_MULTI_PIO)
		nr_bytes = min_t(unsigned, cmd->nleft, drive->mult_count << 9);
	else
		nr_bytes = SECTOR_SIZE;

	ide_pio_bytes(drive, cmd, write, nr_bytes);

	drive->io_32bit = saved_io_32bit;
}

static void ide_error_cmd(ide_drive_t *drive, struct ide_cmd *cmd)
{
	if (cmd->tf_flags & IDE_TFLAG_FS) {
		int nr_bytes = cmd->nbytes - cmd->nleft;

		if (cmd->protocol == ATA_PROT_PIO &&
		    ((cmd->tf_flags & IDE_TFLAG_WRITE) || cmd->nleft == 0)) {
			if (cmd->tf_flags & IDE_TFLAG_MULTI_PIO)
				nr_bytes -= drive->mult_count << 9;
			else
				nr_bytes -= SECTOR_SIZE;
		}

		if (nr_bytes > 0)
			ide_complete_rq(drive, 0, nr_bytes);
	}
}

void ide_finish_cmd(ide_drive_t *drive, struct ide_cmd *cmd, u8 stat)
{
	struct request *rq = drive->hwif->rq;
	u8 err = ide_read_error(drive), nsect = cmd->tf.nsect;
	u8 set_xfer = !!(cmd->tf_flags & IDE_TFLAG_SET_XFER);

	ide_complete_cmd(drive, cmd, stat, err);
	rq->errors = err;

	if (err == 0 && set_xfer) {
		ide_set_xfer_rate(drive, nsect);
		ide_driveid_update(drive);
	}

	ide_complete_rq(drive, err ? -EIO : 0, blk_rq_bytes(rq));
}

/*
 * Handler for command with PIO data phase.
 */
static ide_startstop_t task_pio_intr(ide_drive_t *drive)
{
	ide_hwif_t *hwif = drive->hwif;
	struct ide_cmd *cmd = &drive->hwif->cmd;
	u8 stat = hwif->tp_ops->read_status(hwif);
	u8 write = !!(cmd->tf_flags & IDE_TFLAG_WRITE);

	if (write == 0) {
		/* Error? */
		if (stat & ATA_ERR)
			goto out_err;

		/* Didn't want any data? Odd. */
		if ((stat & ATA_DRQ) == 0) {
			/* Command all done? */
			if (OK_STAT(stat, ATA_DRDY, ATA_BUSY))
				goto out_end;

			/* Assume it was a spurious irq */
			goto out_wait;
		}
	} else {
		if (!OK_STAT(stat, DRIVE_READY, drive->bad_wstat))
			goto out_err;

		/* Deal with unexpected ATA data phase. */
		if (((stat & ATA_DRQ) == 0) ^ (cmd->nleft == 0))
			goto out_err;
	}

	if (write && cmd->nleft == 0)
		goto out_end;

	/* Still data left to transfer. */
	ide_pio_datablock(drive, cmd, write);

	/* Are we done? Check status and finish transfer. */
	if (write == 0 && cmd->nleft == 0) {
		stat = wait_drive_not_busy(drive);
		if (!OK_STAT(stat, 0, BAD_STAT))
			goto out_err;

		goto out_end;
	}
out_wait:
	/* Still data left to transfer. */
	ide_set_handler(drive, &task_pio_intr, WAIT_WORSTCASE);
	return ide_started;
out_end:
	if ((cmd->tf_flags & IDE_TFLAG_FS) == 0)
		ide_finish_cmd(drive, cmd, stat);
	else
		ide_complete_rq(drive, 0, blk_rq_sectors(cmd->rq) << 9);
	return ide_stopped;
out_err:
	ide_error_cmd(drive, cmd);
	return ide_error(drive, __func__, stat);
}

static ide_startstop_t pre_task_out_intr(ide_drive_t *drive,
					 struct ide_cmd *cmd)
{
	ide_startstop_t startstop;

	if (ide_wait_stat(&startstop, drive, ATA_DRQ,
			  drive->bad_wstat, WAIT_DRQ)) {
		pr_err("%s: no DRQ after issuing %sWRITE%s\n", drive->name,
			(cmd->tf_flags & IDE_TFLAG_MULTI_PIO) ? "MULT" : "",
			(drive->dev_flags & IDE_DFLAG_LBA48) ? "_EXT" : "");
		return startstop;
	}

	if ((drive->dev_flags & IDE_DFLAG_UNMASK) == 0)
		local_irq_disable();

	ide_set_handler(drive, &task_pio_intr, WAIT_WORSTCASE);

	ide_pio_datablock(drive, cmd, 1);

	return ide_started;
}

int ide_raw_taskfile(ide_drive_t *drive, struct ide_cmd *cmd, u8 *buf,
		     u16 nsect)
{
	struct request *rq;
	int error;
	int rw = !(cmd->tf_flags & IDE_TFLAG_WRITE) ? READ : WRITE;

	rq = blk_get_request(drive->queue, rw, __GFP_RECLAIM);
	rq->cmd_type = REQ_TYPE_ATA_TASKFILE;

	/*
	 * (ks) We transfer currently only whole sectors.
	 * This is suffient for now.  But, it would be great,
	 * if we would find a solution to transfer any size.
	 * To support special commands like READ LONG.
	 */
	if (nsect) {
		error = blk_rq_map_kern(drive->queue, rq, buf,
					nsect * SECTOR_SIZE, __GFP_RECLAIM);
		if (error)
			goto put_req;
	}

	rq->special = cmd;
	cmd->rq = rq;

	error = blk_execute_rq(drive->queue, NULL, rq, 0);

put_req:
	blk_put_request(rq);
	return error;
}
EXPORT_SYMBOL(ide_raw_taskfile);

int ide_no_data_taskfile(ide_drive_t *drive, struct ide_cmd *cmd)
{
	cmd->protocol = ATA_PROT_NODATA;

	return ide_raw_taskfile(drive, cmd, NULL, 0);
}
EXPORT_SYMBOL_GPL(ide_no_data_taskfile);

#ifdef CONFIG_IDE_TASK_IOCTL
int ide_taskfile_ioctl(ide_drive_t *drive, unsigned long arg)
{
	ide_task_request_t	*req_task;
	struct ide_cmd		cmd;
	u8 *outbuf		= NULL;
	u8 *inbuf		= NULL;
	u8 *data_buf		= NULL;
	int err			= 0;
	int tasksize		= sizeof(struct ide_task_request_s);
	unsigned int taskin	= 0;
	unsigned int taskout	= 0;
	u16 nsect		= 0;
	char __user *buf = (char __user *)arg;

	req_task = memdup_user(buf, tasksize);
	if (IS_ERR(req_task))
		return PTR_ERR(req_task);

	taskout = req_task->out_size;
	taskin  = req_task->in_size;

	if (taskin > 65536 || taskout > 65536) {
		err = -EINVAL;
		goto abort;
	}

	if (taskout) {
		int outtotal = tasksize;
		outbuf = kzalloc(taskout, GFP_KERNEL);
		if (outbuf == NULL) {
			err = -ENOMEM;
			goto abort;
		}
		if (copy_from_user(outbuf, buf + outtotal, taskout)) {
			err = -EFAULT;
			goto abort;
		}
	}

	if (taskin) {
		int intotal = tasksize + taskout;
		inbuf = kzalloc(taskin, GFP_KERNEL);
		if (inbuf == NULL) {
			err = -ENOMEM;
			goto abort;
		}
		if (copy_from_user(inbuf, buf + intotal, taskin)) {
			err = -EFAULT;
			goto abort;
		}
	}

	memset(&cmd, 0, sizeof(cmd));

	memcpy(&cmd.hob, req_task->hob_ports, HDIO_DRIVE_HOB_HDR_SIZE - 2);
	memcpy(&cmd.tf,  req_task->io_ports,  HDIO_DRIVE_TASK_HDR_SIZE);

	cmd.valid.out.tf = IDE_VALID_DEVICE;
	cmd.valid.in.tf  = IDE_VALID_DEVICE | IDE_VALID_IN_TF;
	cmd.tf_flags = IDE_TFLAG_IO_16BIT;

	if (drive->dev_flags & IDE_DFLAG_LBA48) {
		cmd.tf_flags |= IDE_TFLAG_LBA48;
		cmd.valid.in.hob = IDE_VALID_IN_HOB;
	}

	if (req_task->out_flags.all) {
		cmd.ftf_flags |= IDE_FTFLAG_FLAGGED;

		if (req_task->out_flags.b.data)
			cmd.ftf_flags |= IDE_FTFLAG_OUT_DATA;

		if (req_task->out_flags.b.nsector_hob)
			cmd.valid.out.hob |= IDE_VALID_NSECT;
		if (req_task->out_flags.b.sector_hob)
			cmd.valid.out.hob |= IDE_VALID_LBAL;
		if (req_task->out_flags.b.lcyl_hob)
			cmd.valid.out.hob |= IDE_VALID_LBAM;
		if (req_task->out_flags.b.hcyl_hob)
			cmd.valid.out.hob |= IDE_VALID_LBAH;

		if (req_task->out_flags.b.error_feature)
			cmd.valid.out.tf  |= IDE_VALID_FEATURE;
		if (req_task->out_flags.b.nsector)
			cmd.valid.out.tf  |= IDE_VALID_NSECT;
		if (req_task->out_flags.b.sector)
			cmd.valid.out.tf  |= IDE_VALID_LBAL;
		if (req_task->out_flags.b.lcyl)
			cmd.valid.out.tf  |= IDE_VALID_LBAM;
		if (req_task->out_flags.b.hcyl)
			cmd.valid.out.tf  |= IDE_VALID_LBAH;
	} else {
		cmd.valid.out.tf |= IDE_VALID_OUT_TF;
		if (cmd.tf_flags & IDE_TFLAG_LBA48)
			cmd.valid.out.hob |= IDE_VALID_OUT_HOB;
	}

	if (req_task->in_flags.b.data)
		cmd.ftf_flags |= IDE_FTFLAG_IN_DATA;

	if (req_task->req_cmd == IDE_DRIVE_TASK_RAW_WRITE) {
		/* fixup data phase if needed */
		if (req_task->data_phase == TASKFILE_IN_DMAQ ||
		    req_task->data_phase == TASKFILE_IN_DMA)
			cmd.tf_flags |= IDE_TFLAG_WRITE;
	}

	cmd.protocol = ATA_PROT_DMA;

	switch (req_task->data_phase) {
	case TASKFILE_MULTI_OUT:
		if (!drive->mult_count) {
			/* (hs): give up if multcount is not set */
			pr_err("%s: %s Multimode Write multcount is not set\n",
				drive->name, __func__);
			err = -EPERM;
			goto abort;
		}
		cmd.tf_flags |= IDE_TFLAG_MULTI_PIO;
		/* fall through */
	case TASKFILE_OUT:
		cmd.protocol = ATA_PROT_PIO;
		/* fall through */
	case TASKFILE_OUT_DMAQ:
	case TASKFILE_OUT_DMA:
		cmd.tf_flags |= IDE_TFLAG_WRITE;
		nsect = taskout / SECTOR_SIZE;
		data_buf = outbuf;
		break;
	case TASKFILE_MULTI_IN:
		if (!drive->mult_count) {
			/* (hs): give up if multcount is not set */
			pr_err("%s: %s Multimode Read multcount is not set\n",
				drive->name, __func__);
			err = -EPERM;
			goto abort;
		}
		cmd.tf_flags |= IDE_TFLAG_MULTI_PIO;
		/* fall through */
	case TASKFILE_IN:
		cmd.protocol = ATA_PROT_PIO;
		/* fall through */
	case TASKFILE_IN_DMAQ:
	case TASKFILE_IN_DMA:
		nsect = taskin / SECTOR_SIZE;
		data_buf = inbuf;
		break;
	case TASKFILE_NO_DATA:
		cmd.protocol = ATA_PROT_NODATA;
		break;
	default:
		err = -EFAULT;
		goto abort;
	}

	if (req_task->req_cmd == IDE_DRIVE_TASK_NO_DATA)
		nsect = 0;
	else if (!nsect) {
		nsect = (cmd.hob.nsect << 8) | cmd.tf.nsect;

		if (!nsect) {
			pr_err("%s: in/out command without data\n",
					drive->name);
			err = -EFAULT;
			goto abort;
		}
	}

	err = ide_raw_taskfile(drive, &cmd, data_buf, nsect);

	memcpy(req_task->hob_ports, &cmd.hob, HDIO_DRIVE_HOB_HDR_SIZE - 2);
	memcpy(req_task->io_ports,  &cmd.tf,  HDIO_DRIVE_TASK_HDR_SIZE);

	if ((cmd.ftf_flags & IDE_FTFLAG_SET_IN_FLAGS) &&
	    req_task->in_flags.all == 0) {
		req_task->in_flags.all = IDE_TASKFILE_STD_IN_FLAGS;
		if (drive->dev_flags & IDE_DFLAG_LBA48)
			req_task->in_flags.all |= (IDE_HOB_STD_IN_FLAGS << 8);
	}

	if (copy_to_user(buf, req_task, tasksize)) {
		err = -EFAULT;
		goto abort;
	}
	if (taskout) {
		int outtotal = tasksize;
		if (copy_to_user(buf + outtotal, outbuf, taskout)) {
			err = -EFAULT;
			goto abort;
		}
	}
	if (taskin) {
		int intotal = tasksize + taskout;
		if (copy_to_user(buf + intotal, inbuf, taskin)) {
			err = -EFAULT;
			goto abort;
		}
	}
abort:
	kfree(req_task);
	kfree(outbuf);
	kfree(inbuf);

	return err;
}
#endif
Commit	Line	Data
	1	/*
	2	* Copyright (C) 2000-2002 Michael Cornwell <cornwell@acm.org>
	3	* Copyright (C) 2000-2002 Andre Hedrick <andre@linux-ide.org>
	4	* Copyright (C) 2001-2002 Klaus Smolin
	5	* IBM Storage Technology Division
	6	* Copyright (C) 2003-2004, 2007 Bartlomiej Zolnierkiewicz
	7	*
	8	* The big the bad and the ugly.
	9	*/
	10
	11	#include <linux/types.h>
	12	#include <linux/string.h>
	13	#include <linux/kernel.h>
	14	#include <linux/export.h>
	15	#include <linux/sched.h>
	16	#include <linux/interrupt.h>
	17	#include <linux/errno.h>
	18	#include <linux/slab.h>
	19	#include <linux/delay.h>
	20	#include <linux/hdreg.h>
	21	#include <linux/ide.h>
	22	#include <linux/scatterlist.h>
	23	#include <linux/uaccess.h>
	24
	25	#include <asm/io.h>
	26
	27	void ide_tf_readback(ide_drive_t drive, struct ide_cmd cmd)
	28	{
	29	ide_hwif_t *hwif = drive->hwif;
	30	const struct ide_tp_ops *tp_ops = hwif->tp_ops;
	31
	32	/* Be sure we're looking at the low order bytes */
	33	tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS);
	34
	35	tp_ops->tf_read(drive, &cmd->tf, cmd->valid.in.tf);
	36
	37	if (cmd->tf_flags & IDE_TFLAG_LBA48) {
	38	tp_ops->write_devctl(hwif, ATA_HOB \| ATA_DEVCTL_OBS);
	39
	40	tp_ops->tf_read(drive, &cmd->hob, cmd->valid.in.hob);
	41	}
	42	}
	43
	44	void ide_tf_dump(const char s, struct ide_cmd cmd)
	45	{
	46	#ifdef DEBUG
	47	printk("%s: tf: feat 0x%02x nsect 0x%02x lbal 0x%02x "
	48	"lbam 0x%02x lbah 0x%02x dev 0x%02x cmd 0x%02x\n",
	49	s, cmd->tf.feature, cmd->tf.nsect,
	50	cmd->tf.lbal, cmd->tf.lbam, cmd->tf.lbah,
	51	cmd->tf.device, cmd->tf.command);
	52	printk("%s: hob: nsect 0x%02x lbal 0x%02x lbam 0x%02x lbah 0x%02x\n",
	53	s, cmd->hob.nsect, cmd->hob.lbal, cmd->hob.lbam, cmd->hob.lbah);
	54	#endif
	55	}
	56
	57	int taskfile_lib_get_identify(ide_drive_t drive, u8 buf)
	58	{
	59	struct ide_cmd cmd;
	60
	61	memset(&cmd, 0, sizeof(cmd));
	62	cmd.tf.nsect = 0x01;
	63	if (drive->media == ide_disk)
	64	cmd.tf.command = ATA_CMD_ID_ATA;
	65	else
	66	cmd.tf.command = ATA_CMD_ID_ATAPI;
	67	cmd.valid.out.tf = IDE_VALID_OUT_TF \| IDE_VALID_DEVICE;
	68	cmd.valid.in.tf = IDE_VALID_IN_TF \| IDE_VALID_DEVICE;
	69	cmd.protocol = ATA_PROT_PIO;
	70
	71	return ide_raw_taskfile(drive, &cmd, buf, 1);
	72	}
	73
	74	static ide_startstop_t task_no_data_intr(ide_drive_t *);
	75	static ide_startstop_t pre_task_out_intr(ide_drive_t , struct ide_cmd );
	76	static ide_startstop_t task_pio_intr(ide_drive_t *);
	77
	78	ide_startstop_t do_rw_taskfile(ide_drive_t drive, struct ide_cmd orig_cmd)
	79	{
	80	ide_hwif_t *hwif = drive->hwif;
	81	struct ide_cmd *cmd = &hwif->cmd;
	82	struct ide_taskfile *tf = &cmd->tf;
	83	ide_handler_t *handler = NULL;
	84	const struct ide_tp_ops *tp_ops = hwif->tp_ops;
	85	const struct ide_dma_ops *dma_ops = hwif->dma_ops;
	86
	87	if (orig_cmd->protocol == ATA_PROT_PIO &&
	88	(orig_cmd->tf_flags & IDE_TFLAG_MULTI_PIO) &&
	89	drive->mult_count == 0) {
	90	pr_err("%s: multimode not set!\n", drive->name);
	91	return ide_stopped;
	92	}
	93
	94	if (orig_cmd->ftf_flags & IDE_FTFLAG_FLAGGED)
	95	orig_cmd->ftf_flags \|= IDE_FTFLAG_SET_IN_FLAGS;
	96
	97	memcpy(cmd, orig_cmd, sizeof(*cmd));
	98
	99	if ((cmd->tf_flags & IDE_TFLAG_DMA_PIO_FALLBACK) == 0) {
	100	ide_tf_dump(drive->name, cmd);
	101	tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS);
	102
	103	if (cmd->ftf_flags & IDE_FTFLAG_OUT_DATA) {
	104	u8 data[2] = { cmd->tf.data, cmd->hob.data };
	105
	106	tp_ops->output_data(drive, cmd, data, 2);
	107	}
	108
	109	if (cmd->valid.out.tf & IDE_VALID_DEVICE) {
	110	u8 HIHI = (cmd->tf_flags & IDE_TFLAG_LBA48) ?
	111	0xE0 : 0xEF;
	112
	113	if (!(cmd->ftf_flags & IDE_FTFLAG_FLAGGED))
	114	cmd->tf.device &= HIHI;
	115	cmd->tf.device \|= drive->select;
	116	}
	117
	118	tp_ops->tf_load(drive, &cmd->hob, cmd->valid.out.hob);
	119	tp_ops->tf_load(drive, &cmd->tf, cmd->valid.out.tf);
	120	}
	121
	122	switch (cmd->protocol) {
	123	case ATA_PROT_PIO:
	124	if (cmd->tf_flags & IDE_TFLAG_WRITE) {
	125	tp_ops->exec_command(hwif, tf->command);
	126	ndelay(400); /* FIXME */
	127	return pre_task_out_intr(drive, cmd);
	128	}
	129	handler = task_pio_intr;
	130	/* fall-through */
	131	case ATA_PROT_NODATA:
	132	if (handler == NULL)
	133	handler = task_no_data_intr;
	134	ide_execute_command(drive, cmd, handler, WAIT_WORSTCASE);
	135	return ide_started;
	136	case ATA_PROT_DMA:
	137	if (ide_dma_prepare(drive, cmd))
	138	return ide_stopped;
	139	hwif->expiry = dma_ops->dma_timer_expiry;
	140	ide_execute_command(drive, cmd, ide_dma_intr, 2 * WAIT_CMD);
	141	dma_ops->dma_start(drive);
	142	default:
	143	return ide_started;
	144	}
	145	}
	146	EXPORT_SYMBOL_GPL(do_rw_taskfile);
	147
	148	static ide_startstop_t task_no_data_intr(ide_drive_t *drive)
	149	{
	150	ide_hwif_t *hwif = drive->hwif;
	151	struct ide_cmd *cmd = &hwif->cmd;
	152	struct ide_taskfile *tf = &cmd->tf;
	153	int custom = (cmd->tf_flags & IDE_TFLAG_CUSTOM_HANDLER) ? 1 : 0;
	154	int retries = (custom && tf->command == ATA_CMD_INIT_DEV_PARAMS) ? 5 : 1;
	155	u8 stat;
	156
	157	local_irq_enable_in_hardirq();
	158
	159	while (1) {
	160	stat = hwif->tp_ops->read_status(hwif);
	161	if ((stat & ATA_BUSY) == 0 \|\| retries-- == 0)
	162	break;
	163	udelay(10);
	164	};
	165
	166	if (!OK_STAT(stat, ATA_DRDY, BAD_STAT)) {
	167	if (custom && tf->command == ATA_CMD_SET_MULTI) {
	168	drive->mult_req = drive->mult_count = 0;
	169	drive->special_flags \|= IDE_SFLAG_RECALIBRATE;
	170	(void)ide_dump_status(drive, __func__, stat);
	171	return ide_stopped;
	172	} else if (custom && tf->command == ATA_CMD_INIT_DEV_PARAMS) {
	173	if ((stat & (ATA_ERR \| ATA_DRQ)) == 0) {
	174	ide_set_handler(drive, &task_no_data_intr,
	175	WAIT_WORSTCASE);
	176	return ide_started;
	177	}
	178	}
	179	return ide_error(drive, "task_no_data_intr", stat);
	180	}
	181
	182	if (custom && tf->command == ATA_CMD_SET_MULTI)
	183	drive->mult_count = drive->mult_req;
	184
	185	if (custom == 0 \|\| tf->command == ATA_CMD_IDLEIMMEDIATE \|\|
	186	tf->command == ATA_CMD_CHK_POWER) {
	187	struct request *rq = hwif->rq;
	188
	189	if (ata_pm_request(rq))
	190	ide_complete_pm_rq(drive, rq);
	191	else
	192	ide_finish_cmd(drive, cmd, stat);
	193	}
	194
	195	return ide_stopped;
	196	}
	197
	198	static u8 wait_drive_not_busy(ide_drive_t *drive)
	199	{
	200	ide_hwif_t *hwif = drive->hwif;
	201	int retries;
	202	u8 stat;
	203
	204	/*
	205	* Last sector was transferred, wait until device is ready. This can
	206	* take up to 6 ms on some ATAPI devices, so we will wait max 10 ms.
	207	*/
	208	for (retries = 0; retries < 1000; retries++) {
	209	stat = hwif->tp_ops->read_status(hwif);
	210
	211	if (stat & ATA_BUSY)
	212	udelay(10);
	213	else
	214	break;
	215	}
	216
	217	if (stat & ATA_BUSY)
	218	pr_err("%s: drive still BUSY!\n", drive->name);
	219
	220	return stat;
	221	}
	222
	223	void ide_pio_bytes(ide_drive_t drive, struct ide_cmd cmd,
	224	unsigned int write, unsigned int len)
	225	{
	226	ide_hwif_t *hwif = drive->hwif;
	227	struct scatterlist *sg = hwif->sg_table;
	228	struct scatterlist *cursg = cmd->cursg;
	229	unsigned long uninitialized_var(flags);
	230	struct page *page;
	231	unsigned int offset;
	232	u8 *buf;
	233
	234	cursg = cmd->cursg;
	235	if (cursg == NULL)
	236	cursg = cmd->cursg = sg;
	237
	238	while (len) {
	239	unsigned nr_bytes = min(len, cursg->length - cmd->cursg_ofs);
	240	int page_is_high;
	241
	242	page = sg_page(cursg);
	243	offset = cursg->offset + cmd->cursg_ofs;
	244
	245	/* get the current page and offset */
	246	page = nth_page(page, (offset >> PAGE_SHIFT));
	247	offset %= PAGE_SIZE;
	248
	249	nr_bytes = min_t(unsigned, nr_bytes, (PAGE_SIZE - offset));
	250
	251	page_is_high = PageHighMem(page);
	252	if (page_is_high)
	253	local_irq_save(flags);
	254
	255	buf = kmap_atomic(page) + offset;
	256
	257	cmd->nleft -= nr_bytes;
	258	cmd->cursg_ofs += nr_bytes;
	259
	260	if (cmd->cursg_ofs == cursg->length) {
	261	cursg = cmd->cursg = sg_next(cmd->cursg);
	262	cmd->cursg_ofs = 0;
	263	}
	264
	265	/* do the actual data transfer */
	266	if (write)
	267	hwif->tp_ops->output_data(drive, cmd, buf, nr_bytes);
	268	else
	269	hwif->tp_ops->input_data(drive, cmd, buf, nr_bytes);
	270
	271	kunmap_atomic(buf);
	272
	273	if (page_is_high)
	274	local_irq_restore(flags);
	275
	276	len -= nr_bytes;
	277	}
	278	}
	279	EXPORT_SYMBOL_GPL(ide_pio_bytes);
	280
	281	static void ide_pio_datablock(ide_drive_t drive, struct ide_cmd cmd,
	282	unsigned int write)
	283	{
	284	unsigned int nr_bytes;
	285
	286	u8 saved_io_32bit = drive->io_32bit;
	287
	288	if (cmd->tf_flags & IDE_TFLAG_FS)
	289	cmd->rq->errors = 0;
	290
	291	if (cmd->tf_flags & IDE_TFLAG_IO_16BIT)
	292	drive->io_32bit = 0;
	293
	294	touch_softlockup_watchdog();
	295
	296	if (cmd->tf_flags & IDE_TFLAG_MULTI_PIO)
	297	nr_bytes = min_t(unsigned, cmd->nleft, drive->mult_count << 9);
	298	else
	299	nr_bytes = SECTOR_SIZE;
	300
	301	ide_pio_bytes(drive, cmd, write, nr_bytes);
	302
	303	drive->io_32bit = saved_io_32bit;
	304	}
	305
	306	static void ide_error_cmd(ide_drive_t drive, struct ide_cmd cmd)
	307	{
	308	if (cmd->tf_flags & IDE_TFLAG_FS) {
	309	int nr_bytes = cmd->nbytes - cmd->nleft;
	310
	311	if (cmd->protocol == ATA_PROT_PIO &&
	312	((cmd->tf_flags & IDE_TFLAG_WRITE) \|\| cmd->nleft == 0)) {
	313	if (cmd->tf_flags & IDE_TFLAG_MULTI_PIO)
	314	nr_bytes -= drive->mult_count << 9;
	315	else
	316	nr_bytes -= SECTOR_SIZE;
	317	}
	318
	319	if (nr_bytes > 0)
	320	ide_complete_rq(drive, 0, nr_bytes);
	321	}
	322	}
	323
	324	void ide_finish_cmd(ide_drive_t drive, struct ide_cmd cmd, u8 stat)
	325	{
	326	struct request *rq = drive->hwif->rq;
	327	u8 err = ide_read_error(drive), nsect = cmd->tf.nsect;
	328	u8 set_xfer = !!(cmd->tf_flags & IDE_TFLAG_SET_XFER);
	329
	330	ide_complete_cmd(drive, cmd, stat, err);
	331	rq->errors = err;
	332
	333	if (err == 0 && set_xfer) {
	334	ide_set_xfer_rate(drive, nsect);
	335	ide_driveid_update(drive);
	336	}
	337
	338	ide_complete_rq(drive, err ? -EIO : 0, blk_rq_bytes(rq));
	339	}
	340
	341	/*
	342	* Handler for command with PIO data phase.
	343	*/
	344	static ide_startstop_t task_pio_intr(ide_drive_t *drive)
	345	{
	346	ide_hwif_t *hwif = drive->hwif;
	347	struct ide_cmd *cmd = &drive->hwif->cmd;
	348	u8 stat = hwif->tp_ops->read_status(hwif);
	349	u8 write = !!(cmd->tf_flags & IDE_TFLAG_WRITE);
	350
	351	if (write == 0) {
	352	/* Error? */
	353	if (stat & ATA_ERR)
	354	goto out_err;
	355
	356	/* Didn't want any data? Odd. */
	357	if ((stat & ATA_DRQ) == 0) {
	358	/* Command all done? */
	359	if (OK_STAT(stat, ATA_DRDY, ATA_BUSY))
	360	goto out_end;
	361
	362	/* Assume it was a spurious irq */
	363	goto out_wait;
	364	}
	365	} else {
	366	if (!OK_STAT(stat, DRIVE_READY, drive->bad_wstat))
	367	goto out_err;
	368
	369	/* Deal with unexpected ATA data phase. */
	370	if (((stat & ATA_DRQ) == 0) ^ (cmd->nleft == 0))
	371	goto out_err;
	372	}
	373
	374	if (write && cmd->nleft == 0)
	375	goto out_end;
	376
	377	/* Still data left to transfer. */
	378	ide_pio_datablock(drive, cmd, write);
	379
	380	/* Are we done? Check status and finish transfer. */
	381	if (write == 0 && cmd->nleft == 0) {
	382	stat = wait_drive_not_busy(drive);
	383	if (!OK_STAT(stat, 0, BAD_STAT))
	384	goto out_err;
	385
	386	goto out_end;
	387	}
	388	out_wait:
	389	/* Still data left to transfer. */
	390	ide_set_handler(drive, &task_pio_intr, WAIT_WORSTCASE);
	391	return ide_started;
	392	out_end:
	393	if ((cmd->tf_flags & IDE_TFLAG_FS) == 0)
	394	ide_finish_cmd(drive, cmd, stat);
	395	else
	396	ide_complete_rq(drive, 0, blk_rq_sectors(cmd->rq) << 9);
	397	return ide_stopped;
	398	out_err:
	399	ide_error_cmd(drive, cmd);
	400	return ide_error(drive, __func__, stat);
	401	}
	402
	403	static ide_startstop_t pre_task_out_intr(ide_drive_t *drive,
	404	struct ide_cmd *cmd)
	405	{
	406	ide_startstop_t startstop;
	407
	408	if (ide_wait_stat(&startstop, drive, ATA_DRQ,
	409	drive->bad_wstat, WAIT_DRQ)) {
	410	pr_err("%s: no DRQ after issuing %sWRITE%s\n", drive->name,
	411	(cmd->tf_flags & IDE_TFLAG_MULTI_PIO) ? "MULT" : "",
	412	(drive->dev_flags & IDE_DFLAG_LBA48) ? "_EXT" : "");
	413	return startstop;
	414	}
	415
	416	if ((drive->dev_flags & IDE_DFLAG_UNMASK) == 0)
	417	local_irq_disable();
	418
	419	ide_set_handler(drive, &task_pio_intr, WAIT_WORSTCASE);
	420
	421	ide_pio_datablock(drive, cmd, 1);
	422
	423	return ide_started;
	424	}
	425
	426	int ide_raw_taskfile(ide_drive_t drive, struct ide_cmd cmd, u8 *buf,
	427	u16 nsect)
	428	{
	429	struct request *rq;
	430	int error;
	431	int rw = !(cmd->tf_flags & IDE_TFLAG_WRITE) ? READ : WRITE;
	432
	433	rq = blk_get_request(drive->queue, rw, __GFP_RECLAIM);
	434	rq->cmd_type = REQ_TYPE_ATA_TASKFILE;
	435
	436	/*
	437	* (ks) We transfer currently only whole sectors.
	438	* This is suffient for now. But, it would be great,
	439	* if we would find a solution to transfer any size.
	440	* To support special commands like READ LONG.
	441	*/
	442	if (nsect) {
	443	error = blk_rq_map_kern(drive->queue, rq, buf,
	444	nsect * SECTOR_SIZE, __GFP_RECLAIM);
	445	if (error)
	446	goto put_req;
	447	}
	448
	449	rq->special = cmd;
	450	cmd->rq = rq;
	451
	452	error = blk_execute_rq(drive->queue, NULL, rq, 0);
	453
	454	put_req:
	455	blk_put_request(rq);
	456	return error;
	457	}
	458	EXPORT_SYMBOL(ide_raw_taskfile);
	459
	460	int ide_no_data_taskfile(ide_drive_t drive, struct ide_cmd cmd)
	461	{
	462	cmd->protocol = ATA_PROT_NODATA;
	463
	464	return ide_raw_taskfile(drive, cmd, NULL, 0);
	465	}
	466	EXPORT_SYMBOL_GPL(ide_no_data_taskfile);
	467
	468	#ifdef CONFIG_IDE_TASK_IOCTL
	469	int ide_taskfile_ioctl(ide_drive_t *drive, unsigned long arg)
	470	{
	471	ide_task_request_t *req_task;
	472	struct ide_cmd cmd;
	473	u8 *outbuf = NULL;
	474	u8 *inbuf = NULL;
	475	u8 *data_buf = NULL;
	476	int err = 0;
	477	int tasksize = sizeof(struct ide_task_request_s);
	478	unsigned int taskin = 0;
	479	unsigned int taskout = 0;
	480	u16 nsect = 0;
	481	char __user buf = (char __user )arg;
	482
	483	req_task = memdup_user(buf, tasksize);
	484	if (IS_ERR(req_task))
	485	return PTR_ERR(req_task);
	486
	487	taskout = req_task->out_size;
	488	taskin = req_task->in_size;
	489
	490	if (taskin > 65536 \|\| taskout > 65536) {
	491	err = -EINVAL;
	492	goto abort;
	493	}
	494
	495	if (taskout) {
	496	int outtotal = tasksize;
	497	outbuf = kzalloc(taskout, GFP_KERNEL);
	498	if (outbuf == NULL) {
	499	err = -ENOMEM;
	500	goto abort;
	501	}
	502	if (copy_from_user(outbuf, buf + outtotal, taskout)) {
	503	err = -EFAULT;
	504	goto abort;
	505	}
	506	}
	507
	508	if (taskin) {
	509	int intotal = tasksize + taskout;
	510	inbuf = kzalloc(taskin, GFP_KERNEL);
	511	if (inbuf == NULL) {
	512	err = -ENOMEM;
	513	goto abort;
	514	}
	515	if (copy_from_user(inbuf, buf + intotal, taskin)) {
	516	err = -EFAULT;
	517	goto abort;
	518	}
	519	}
	520
	521	memset(&cmd, 0, sizeof(cmd));
	522
	523	memcpy(&cmd.hob, req_task->hob_ports, HDIO_DRIVE_HOB_HDR_SIZE - 2);
	524	memcpy(&cmd.tf, req_task->io_ports, HDIO_DRIVE_TASK_HDR_SIZE);
	525
	526	cmd.valid.out.tf = IDE_VALID_DEVICE;
	527	cmd.valid.in.tf = IDE_VALID_DEVICE \| IDE_VALID_IN_TF;
	528	cmd.tf_flags = IDE_TFLAG_IO_16BIT;
	529
	530	if (drive->dev_flags & IDE_DFLAG_LBA48) {
	531	cmd.tf_flags \|= IDE_TFLAG_LBA48;
	532	cmd.valid.in.hob = IDE_VALID_IN_HOB;
	533	}
	534
	535	if (req_task->out_flags.all) {
	536	cmd.ftf_flags \|= IDE_FTFLAG_FLAGGED;
	537
	538	if (req_task->out_flags.b.data)
	539	cmd.ftf_flags \|= IDE_FTFLAG_OUT_DATA;
	540
	541	if (req_task->out_flags.b.nsector_hob)
	542	cmd.valid.out.hob \|= IDE_VALID_NSECT;
	543	if (req_task->out_flags.b.sector_hob)
	544	cmd.valid.out.hob \|= IDE_VALID_LBAL;
	545	if (req_task->out_flags.b.lcyl_hob)
	546	cmd.valid.out.hob \|= IDE_VALID_LBAM;
	547	if (req_task->out_flags.b.hcyl_hob)
	548	cmd.valid.out.hob \|= IDE_VALID_LBAH;
	549
	550	if (req_task->out_flags.b.error_feature)
	551	cmd.valid.out.tf \|= IDE_VALID_FEATURE;
	552	if (req_task->out_flags.b.nsector)
	553	cmd.valid.out.tf \|= IDE_VALID_NSECT;
	554	if (req_task->out_flags.b.sector)
	555	cmd.valid.out.tf \|= IDE_VALID_LBAL;
	556	if (req_task->out_flags.b.lcyl)
	557	cmd.valid.out.tf \|= IDE_VALID_LBAM;
	558	if (req_task->out_flags.b.hcyl)
	559	cmd.valid.out.tf \|= IDE_VALID_LBAH;
	560	} else {
	561	cmd.valid.out.tf \|= IDE_VALID_OUT_TF;
	562	if (cmd.tf_flags & IDE_TFLAG_LBA48)
	563	cmd.valid.out.hob \|= IDE_VALID_OUT_HOB;
	564	}
	565
	566	if (req_task->in_flags.b.data)
	567	cmd.ftf_flags \|= IDE_FTFLAG_IN_DATA;
	568
	569	if (req_task->req_cmd == IDE_DRIVE_TASK_RAW_WRITE) {
	570	/* fixup data phase if needed */
	571	if (req_task->data_phase == TASKFILE_IN_DMAQ \|\|
	572	req_task->data_phase == TASKFILE_IN_DMA)
	573	cmd.tf_flags \|= IDE_TFLAG_WRITE;
	574	}
	575
	576	cmd.protocol = ATA_PROT_DMA;
	577
	578	switch (req_task->data_phase) {
	579	case TASKFILE_MULTI_OUT:
	580	if (!drive->mult_count) {
	581	/* (hs): give up if multcount is not set */
	582	pr_err("%s: %s Multimode Write multcount is not set\n",
	583	drive->name, __func__);
	584	err = -EPERM;
	585	goto abort;
	586	}
	587	cmd.tf_flags \|= IDE_TFLAG_MULTI_PIO;
	588	/* fall through */
	589	case TASKFILE_OUT:
	590	cmd.protocol = ATA_PROT_PIO;
	591	/* fall through */
	592	case TASKFILE_OUT_DMAQ:
	593	case TASKFILE_OUT_DMA:
	594	cmd.tf_flags \|= IDE_TFLAG_WRITE;
	595	nsect = taskout / SECTOR_SIZE;
	596	data_buf = outbuf;
	597	break;
	598	case TASKFILE_MULTI_IN:
	599	if (!drive->mult_count) {
	600	/* (hs): give up if multcount is not set */
	601	pr_err("%s: %s Multimode Read multcount is not set\n",
	602	drive->name, __func__);
	603	err = -EPERM;
	604	goto abort;
	605	}
	606	cmd.tf_flags \|= IDE_TFLAG_MULTI_PIO;
	607	/* fall through */
	608	case TASKFILE_IN:
	609	cmd.protocol = ATA_PROT_PIO;
	610	/* fall through */
	611	case TASKFILE_IN_DMAQ:
	612	case TASKFILE_IN_DMA:
	613	nsect = taskin / SECTOR_SIZE;
	614	data_buf = inbuf;
	615	break;
	616	case TASKFILE_NO_DATA:
	617	cmd.protocol = ATA_PROT_NODATA;
	618	break;
	619	default:
	620	err = -EFAULT;
	621	goto abort;
	622	}
	623
	624	if (req_task->req_cmd == IDE_DRIVE_TASK_NO_DATA)
	625	nsect = 0;
	626	else if (!nsect) {
	627	nsect = (cmd.hob.nsect << 8) \| cmd.tf.nsect;
	628
	629	if (!nsect) {
	630	pr_err("%s: in/out command without data\n",
	631	drive->name);
	632	err = -EFAULT;
	633	goto abort;
	634	}
	635	}
	636
	637	err = ide_raw_taskfile(drive, &cmd, data_buf, nsect);
	638
	639	memcpy(req_task->hob_ports, &cmd.hob, HDIO_DRIVE_HOB_HDR_SIZE - 2);
	640	memcpy(req_task->io_ports, &cmd.tf, HDIO_DRIVE_TASK_HDR_SIZE);
	641
	642	if ((cmd.ftf_flags & IDE_FTFLAG_SET_IN_FLAGS) &&
	643	req_task->in_flags.all == 0) {
	644	req_task->in_flags.all = IDE_TASKFILE_STD_IN_FLAGS;
	645	if (drive->dev_flags & IDE_DFLAG_LBA48)
	646	req_task->in_flags.all \|= (IDE_HOB_STD_IN_FLAGS << 8);
	647	}
	648
	649	if (copy_to_user(buf, req_task, tasksize)) {
	650	err = -EFAULT;
	651	goto abort;
	652	}
	653	if (taskout) {
	654	int outtotal = tasksize;
	655	if (copy_to_user(buf + outtotal, outbuf, taskout)) {
	656	err = -EFAULT;
	657	goto abort;
	658	}
	659	}
	660	if (taskin) {
	661	int intotal = tasksize + taskout;
	662	if (copy_to_user(buf + intotal, inbuf, taskin)) {
	663	err = -EFAULT;
	664	goto abort;
	665	}
	666	}
	667	abort:
	668	kfree(req_task);
	669	kfree(outbuf);
	670	kfree(inbuf);
	671
	672	return err;
	673	}
	674	#endif