1 files changed, 120 insertions, 122 deletions

diff --git a/drivers/ide/ide-atapi.c b/drivers/ide/ide-atapi.c
index e9d042dba0e0..3e43b889dd64 100644
--- a/drivers/ide/ide-atapi.c
+++ b/drivers/ide/ide-atapi.c
@@ -6,6 +6,8 @@
 #include <linux/cdrom.h>
 #include <linux/delay.h>
 #include <linux/ide.h>
+#include <linux/scatterlist.h>
+
 #include <scsi/scsi.h>
 
 #ifdef DEBUG
@@ -69,56 +71,6 @@ int ide_check_atapi_device(ide_drive_t *drive, const char *s)
 }
 EXPORT_SYMBOL_GPL(ide_check_atapi_device);
 
-/* PIO data transfer routine using the scatter gather table. */
-int ide_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
-		    unsigned int bcount, int write)
-{
-	ide_hwif_t *hwif = drive->hwif;
-	const struct ide_tp_ops *tp_ops = hwif->tp_ops;
-	xfer_func_t *xf = write ? tp_ops->output_data : tp_ops->input_data;
-	struct scatterlist *sg = pc->sg;
-	char *buf;
-	int count, done = 0;
-
-	while (bcount) {
-		count = min(sg->length - pc->b_count, bcount);
-
-		if (PageHighMem(sg_page(sg))) {
-			unsigned long flags;
-
-			local_irq_save(flags);
-			buf = kmap_atomic(sg_page(sg), KM_IRQ0) + sg->offset;
-			xf(drive, NULL, buf + pc->b_count, count);
-			kunmap_atomic(buf - sg->offset, KM_IRQ0);
-			local_irq_restore(flags);
-		} else {
-			buf = sg_virt(sg);
-			xf(drive, NULL, buf + pc->b_count, count);
-		}
-
-		bcount -= count;
-		pc->b_count += count;
-		done += count;
-
-		if (pc->b_count == sg->length) {
-			if (!--pc->sg_cnt)
-				break;
-			pc->sg = sg = sg_next(sg);
-			pc->b_count = 0;
-		}
-	}
-
-	if (bcount) {
-		printk(KERN_ERR "%s: %d leftover bytes, %s\n", drive->name,
-			bcount, write ? "padding with zeros"
-				      : "discarding data");
-		ide_pad_transfer(drive, write, bcount);
-	}
-
-	return done;
-}
-EXPORT_SYMBOL_GPL(ide_io_buffers);
-
 void ide_init_pc(struct ide_atapi_pc *pc)
 {
 	memset(pc, 0, sizeof(*pc));
@@ -149,7 +101,10 @@ static void ide_queue_pc_head(ide_drive_t *drive, struct gendisk *disk,
 	memcpy(rq->cmd, pc->c, 12);
 	if (drive->media == ide_tape)
 		rq->cmd[13] = REQ_IDETAPE_PC1;
-	ide_do_drive_cmd(drive, rq);
+
+	drive->hwif->rq = NULL;
+
+	elv_add_request(drive->queue, rq, ELEVATOR_INSERT_FRONT, 0);
 }
 
 /*
@@ -297,6 +252,21 @@ int ide_cd_get_xferlen(struct request *rq)
 }
 EXPORT_SYMBOL_GPL(ide_cd_get_xferlen);
 
+void ide_read_bcount_and_ireason(ide_drive_t *drive, u16 *bcount, u8 *ireason)
+{
+	struct ide_cmd cmd;
+
+	memset(&cmd, 0, sizeof(cmd));
+	cmd.tf_flags = IDE_TFLAG_IN_LBAH | IDE_TFLAG_IN_LBAM |
+		       IDE_TFLAG_IN_NSECT;
+
+	drive->hwif->tp_ops->tf_read(drive, &cmd);
+
+	*bcount = (cmd.tf.lbah << 8) | cmd.tf.lbam;
+	*ireason = cmd.tf.nsect & 3;
+}
+EXPORT_SYMBOL_GPL(ide_read_bcount_and_ireason);
+
 /*
  * This is the usual interrupt handler which will be called during a packet
  * command.  We will transfer some of the data (as requested by the drive)
@@ -306,29 +276,31 @@ static ide_startstop_t ide_pc_intr(ide_drive_t *drive)
 {
 	struct ide_atapi_pc *pc = drive->pc;
 	ide_hwif_t *hwif = drive->hwif;
+	struct ide_cmd *cmd = &hwif->cmd;
 	struct request *rq = hwif->rq;
 	const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 	xfer_func_t *xferfunc;
-	unsigned int timeout, temp;
+	unsigned int timeout, done;
 	u16 bcount;
 	u8 stat, ireason, dsc = 0;
+	u8 write = !!(pc->flags & PC_FLAG_WRITING);
 
 	debug_log("Enter %s - interrupt handler\n", __func__);
 
 	timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD
 					       : WAIT_TAPE_CMD;
 
-	if (pc->flags & PC_FLAG_TIMEDOUT) {
-		drive->pc_callback(drive, 0);
-		return ide_stopped;
-	}
-
 	/* Clear the interrupt */
 	stat = tp_ops->read_status(hwif);
 
 	if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
-		if (hwif->dma_ops->dma_end(drive) ||
-		    (drive->media == ide_tape && (stat & ATA_ERR))) {
+		int rc;
+
+		drive->waiting_for_dma = 0;
+		rc = hwif->dma_ops->dma_end(drive);
+		ide_dma_unmap_sg(drive, cmd);
+
+		if (rc || (drive->media == ide_tape && (stat & ATA_ERR))) {
 			if (drive->media == ide_floppy)
 				printk(KERN_ERR "%s: DMA %s error\n",
 					drive->name, rq_data_dir(pc->rq)
@@ -344,6 +316,9 @@ static ide_startstop_t ide_pc_intr(ide_drive_t *drive)
 
 	/* No more interrupts */
 	if ((stat & ATA_DRQ) == 0) {
+		int uptodate, error;
+		unsigned int done;
+
 		debug_log("Packet command completed, %d bytes transferred\n",
 			  pc->xferred);
 
@@ -382,8 +357,31 @@ static ide_startstop_t ide_pc_intr(ide_drive_t *drive)
 			dsc = 1;
 
 		/* Command finished - Call the callback function */
-		drive->pc_callback(drive, dsc);
+		uptodate = drive->pc_callback(drive, dsc);
+
+		if (uptodate == 0)
+			drive->failed_pc = NULL;
+
+		if (blk_special_request(rq)) {
+			rq->errors = 0;
+			done = blk_rq_bytes(rq);
+			error = 0;
+		} else {
 
+			if (blk_fs_request(rq) == 0 && uptodate <= 0) {
+				if (rq->errors == 0)
+					rq->errors = -EIO;
+			}
+
+			if (drive->media == ide_tape)
+				done = ide_rq_bytes(rq); /* FIXME */
+			else
+				done = blk_rq_bytes(rq);
+
+			error = uptodate ? 0 : -EIO;
+		}
+
+		ide_complete_rq(drive, error, done);
 		return ide_stopped;
 	}
 
@@ -403,8 +401,7 @@ static ide_startstop_t ide_pc_intr(ide_drive_t *drive)
 		return ide_do_reset(drive);
 	}
 
-	if (((ireason & ATAPI_IO) == ATAPI_IO) ==
-		!!(pc->flags & PC_FLAG_WRITING)) {
+	if (((ireason & ATAPI_IO) == ATAPI_IO) == write) {
 		/* Hopefully, we will never get here */
 		printk(KERN_ERR "%s: We wanted to %s, but the device wants us "
 				"to %s!\n", drive->name,
@@ -413,59 +410,57 @@ static ide_startstop_t ide_pc_intr(ide_drive_t *drive)
 		return ide_do_reset(drive);
 	}
 
-	if (!(pc->flags & PC_FLAG_WRITING)) {
-		/* Reading - Check that we have enough space */
-		temp = pc->xferred + bcount;
-		if (temp > pc->req_xfer) {
-			if (temp > pc->buf_size) {
-				printk(KERN_ERR "%s: The device wants to send "
-						"us more data than expected - "
-						"discarding data\n",
-						drive->name);
-
-				ide_pad_transfer(drive, 0, bcount);
-				goto next_irq;
-			}
-			debug_log("The device wants to send us more data than "
-				  "expected - allowing transfer\n");
-		}
-		xferfunc = tp_ops->input_data;
-	} else
-		xferfunc = tp_ops->output_data;
-
-	if ((drive->media == ide_floppy && !pc->buf) ||
-	    (drive->media == ide_tape && pc->bh)) {
-		int done = drive->pc_io_buffers(drive, pc, bcount,
-				  !!(pc->flags & PC_FLAG_WRITING));
+	xferfunc = write ? tp_ops->output_data : tp_ops->input_data;
 
-		/* FIXME: don't do partial completions */
-		if (drive->media == ide_floppy)
-			ide_end_request(drive, 1, done >> 9);
-	} else
-		xferfunc(drive, NULL, pc->cur_pos, bcount);
+	if (drive->media == ide_floppy && pc->buf == NULL) {
+		done = min_t(unsigned int, bcount, cmd->nleft);
+		ide_pio_bytes(drive, cmd, write, done);
+	} else if (drive->media == ide_tape && pc->bh) {
+		done = drive->pc_io_buffers(drive, pc, bcount, write);
+	} else {
+		done = min_t(unsigned int, bcount, pc->req_xfer - pc->xferred);
+		xferfunc(drive, NULL, pc->cur_pos, done);
+	}
 
 	/* Update the current position */
-	pc->xferred += bcount;
-	pc->cur_pos += bcount;
+	pc->xferred += done;
+	pc->cur_pos += done;
+
+	bcount -= done;
+
+	if (bcount)
+		ide_pad_transfer(drive, write, bcount);
+
+	debug_log("[cmd %x] transferred %d bytes, padded %d bytes\n",
+		  rq->cmd[0], done, bcount);
 
-	debug_log("[cmd %x] transferred %d bytes on that intr.\n",
-		  rq->cmd[0], bcount);
-next_irq:
 	/* And set the interrupt handler again */
-	ide_set_handler(drive, ide_pc_intr, timeout, NULL);
+	ide_set_handler(drive, ide_pc_intr, timeout);
 	return ide_started;
 }
 
+static void ide_init_packet_cmd(struct ide_cmd *cmd, u32 tf_flags,
+				u16 bcount, u8 dma)
+{
+	cmd->protocol  = dma ? ATAPI_PROT_DMA : ATAPI_PROT_PIO;
+	cmd->tf_flags |= IDE_TFLAG_OUT_LBAH | IDE_TFLAG_OUT_LBAM |
+			 IDE_TFLAG_OUT_FEATURE | tf_flags;
+	cmd->tf.command = ATA_CMD_PACKET;
+	cmd->tf.feature = dma;		/* Use PIO/DMA */
+	cmd->tf.lbam    = bcount & 0xff;
+	cmd->tf.lbah    = (bcount >> 8) & 0xff;
+}
+
 static u8 ide_read_ireason(ide_drive_t *drive)
 {
-	ide_task_t task;
+	struct ide_cmd cmd;
 
-	memset(&task, 0, sizeof(task));
-	task.tf_flags = IDE_TFLAG_IN_NSECT;
+	memset(&cmd, 0, sizeof(cmd));
+	cmd.tf_flags = IDE_TFLAG_IN_NSECT;
 
-	drive->hwif->tp_ops->tf_read(drive, &task);
+	drive->hwif->tp_ops->tf_read(drive, &cmd);
 
-	return task.tf.nsect & 3;
+	return cmd.tf.nsect & 3;
 }
 
 static u8 ide_wait_ireason(ide_drive_t *drive, u8 ireason)
@@ -560,11 +555,17 @@ static ide_startstop_t ide_transfer_pc(ide_drive_t *drive)
 		}
 	}
 
+	hwif->expiry = expiry;
+
 	/* Set the interrupt routine */
 	ide_set_handler(drive,
 			(dev_is_idecd(drive) ? drive->irq_handler
 					     : ide_pc_intr),
-			timeout, expiry);
+			timeout);
+
+	/* Send the actual packet */
+	if ((drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) == 0)
+		hwif->tp_ops->output_data(drive, NULL, rq->cmd, cmd_len);
 
 	/* Begin DMA, if necessary */
 	if (dev_is_idecd(drive)) {
@@ -577,30 +578,28 @@ static ide_startstop_t ide_transfer_pc(ide_drive_t *drive)
 		}
 	}
 
-	/* Send the actual packet */
-	if ((drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) == 0)
-		hwif->tp_ops->output_data(drive, NULL, rq->cmd, cmd_len);
-
 	return ide_started;
 }
 
-ide_startstop_t ide_issue_pc(ide_drive_t *drive)
+ide_startstop_t ide_issue_pc(ide_drive_t *drive, struct ide_cmd *cmd)
 {
 	struct ide_atapi_pc *pc;
 	ide_hwif_t *hwif = drive->hwif;
 	ide_expiry_t *expiry = NULL;
+	struct request *rq = hwif->rq;
 	unsigned int timeout;
 	u32 tf_flags;
 	u16 bcount;
+	u8 drq_int = !!(drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT);
 
 	if (dev_is_idecd(drive)) {
 		tf_flags = IDE_TFLAG_OUT_NSECT | IDE_TFLAG_OUT_LBAL;
-		bcount = ide_cd_get_xferlen(hwif->rq);
+		bcount = ide_cd_get_xferlen(rq);
 		expiry = ide_cd_expiry;
 		timeout = ATAPI_WAIT_PC;
 
 		if (drive->dma)
-			drive->dma = !hwif->dma_ops->dma_setup(drive);
+			drive->dma = !ide_dma_prepare(drive, cmd);
 	} else {
 		pc = drive->pc;
 
@@ -618,9 +617,8 @@ ide_startstop_t ide_issue_pc(ide_drive_t *drive)
 			ide_dma_off(drive);
 		}
 
-		if ((pc->flags & PC_FLAG_DMA_OK) &&
-		     (drive->dev_flags & IDE_DFLAG_USING_DMA))
-			drive->dma = !hwif->dma_ops->dma_setup(drive);
+		if (pc->flags & PC_FLAG_DMA_OK)
+			drive->dma = !ide_dma_prepare(drive, cmd);
 
 		if (!drive->dma)
 			pc->flags &= ~PC_FLAG_DMA_OK;
@@ -629,18 +627,18 @@ ide_startstop_t ide_issue_pc(ide_drive_t *drive)
 						       : WAIT_TAPE_CMD;
 	}
 
-	ide_pktcmd_tf_load(drive, tf_flags, bcount, drive->dma);
+	ide_init_packet_cmd(cmd, tf_flags, bcount, drive->dma);
 
-	/* Issue the packet command */
-	if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) {
+	(void)do_rw_taskfile(drive, cmd);
+
+	if (drq_int) {
 		if (drive->dma)
 			drive->waiting_for_dma = 0;
-		ide_execute_command(drive, ATA_CMD_PACKET, ide_transfer_pc,
-				    timeout, expiry);
-		return ide_started;
-	} else {
-		ide_execute_pkt_cmd(drive);
-		return ide_transfer_pc(drive);
+		hwif->expiry = expiry;
 	}
+
+	ide_execute_command(drive, cmd, ide_transfer_pc, timeout);
+
+	return drq_int ? ide_started : ide_transfer_pc(drive);
 }
 EXPORT_SYMBOL_GPL(ide_issue_pc);