1 files changed, 153 insertions, 0 deletions
diff --git a/drivers/ide/ide-park.c b/drivers/ide/ide-park.c
new file mode 100644
index 000000000..622f0edb3
--- /dev/null
+++ b/drivers/ide/ide-park.c
@@ -0,0 +1,153 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/kernel.h>
+#include <linux/gfp.h>
+#include <linux/ide.h>
+#include <linux/jiffies.h>
+#include <linux/blkdev.h>
+
+DECLARE_WAIT_QUEUE_HEAD(ide_park_wq);
+
+static void issue_park_cmd(ide_drive_t *drive, unsigned long timeout)
+{
+	ide_hwif_t *hwif = drive->hwif;
+	struct request_queue *q = drive->queue;
+	struct request *rq;
+	int rc;
+
+	timeout += jiffies;
+	spin_lock_irq(&hwif->lock);
+	if (drive->dev_flags & IDE_DFLAG_PARKED) {
+		int reset_timer = time_before(timeout, drive->sleep);
+		int start_queue = 0;
+
+		drive->sleep = timeout;
+		wake_up_all(&ide_park_wq);
+		if (reset_timer && del_timer(&hwif->timer))
+			start_queue = 1;
+		spin_unlock_irq(&hwif->lock);
+
+		if (start_queue)
+			blk_run_queue(q);
+		return;
+	}
+	spin_unlock_irq(&hwif->lock);
+
+	rq = blk_get_request(q, REQ_OP_DRV_IN, 0);
+	scsi_req(rq)->cmd[0] = REQ_PARK_HEADS;
+	scsi_req(rq)->cmd_len = 1;
+	ide_req(rq)->type = ATA_PRIV_MISC;
+	rq->special = &timeout;
+	blk_execute_rq(q, NULL, rq, 1);
+	rc = scsi_req(rq)->result ? -EIO : 0;
+	blk_put_request(rq);
+	if (rc)
+		goto out;
+
+	/*
+	 * Make sure that *some* command is sent to the drive after the
+	 * timeout has expired, so power management will be reenabled.
+	 */
+	rq = blk_get_request(q, REQ_OP_DRV_IN, BLK_MQ_REQ_NOWAIT);
+	if (IS_ERR(rq))
+		goto out;
+
+	scsi_req(rq)->cmd[0] = REQ_UNPARK_HEADS;
+	scsi_req(rq)->cmd_len = 1;
+	ide_req(rq)->type = ATA_PRIV_MISC;
+	elv_add_request(q, rq, ELEVATOR_INSERT_FRONT);
+
+out:
+	return;
+}
+
+ide_startstop_t ide_do_park_unpark(ide_drive_t *drive, struct request *rq)
+{
+	struct ide_cmd cmd;
+	struct ide_taskfile *tf = &cmd.tf;
+
+	memset(&cmd, 0, sizeof(cmd));
+	if (scsi_req(rq)->cmd[0] == REQ_PARK_HEADS) {
+		drive->sleep = *(unsigned long *)rq->special;
+		drive->dev_flags |= IDE_DFLAG_SLEEPING;
+		tf->command = ATA_CMD_IDLEIMMEDIATE;
+		tf->feature = 0x44;
+		tf->lbal = 0x4c;
+		tf->lbam = 0x4e;
+		tf->lbah = 0x55;
+		cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
+		cmd.valid.in.tf  = IDE_VALID_IN_TF  | IDE_VALID_DEVICE;
+	} else		/* cmd == REQ_UNPARK_HEADS */
+		tf->command = ATA_CMD_CHK_POWER;
+
+	cmd.tf_flags |= IDE_TFLAG_CUSTOM_HANDLER;
+	cmd.protocol = ATA_PROT_NODATA;
+
+	cmd.rq = rq;
+
+	return do_rw_taskfile(drive, &cmd);
+}
+
+ssize_t ide_park_show(struct device *dev, struct device_attribute *attr,
+		      char *buf)
+{
+	ide_drive_t *drive = to_ide_device(dev);
+	ide_hwif_t *hwif = drive->hwif;
+	unsigned long now;
+	unsigned int msecs;
+
+	if (drive->dev_flags & IDE_DFLAG_NO_UNLOAD)
+		return -EOPNOTSUPP;
+
+	spin_lock_irq(&hwif->lock);
+	now = jiffies;
+	if (drive->dev_flags & IDE_DFLAG_PARKED &&
+	    time_after(drive->sleep, now))
+		msecs = jiffies_to_msecs(drive->sleep - now);
+	else
+		msecs = 0;
+	spin_unlock_irq(&hwif->lock);
+
+	return snprintf(buf, 20, "%u\n", msecs);
+}
+
+ssize_t ide_park_store(struct device *dev, struct device_attribute *attr,
+		       const char *buf, size_t len)
+{
+#define MAX_PARK_TIMEOUT 30000
+	ide_drive_t *drive = to_ide_device(dev);
+	long int input;
+	int rc;
+
+	rc = kstrtol(buf, 10, &input);
+	if (rc)
+		return rc;
+	if (input < -2)
+		return -EINVAL;
+	if (input > MAX_PARK_TIMEOUT) {
+		input = MAX_PARK_TIMEOUT;
+		rc = -EOVERFLOW;
+	}
+
+	mutex_lock(&ide_setting_mtx);
+	if (input >= 0) {
+		if (drive->dev_flags & IDE_DFLAG_NO_UNLOAD)
+			rc = -EOPNOTSUPP;
+		else if (input || drive->dev_flags & IDE_DFLAG_PARKED)
+			issue_park_cmd(drive, msecs_to_jiffies(input));
+	} else {
+		if (drive->media == ide_disk)
+			switch (input) {
+			case -1:
+				drive->dev_flags &= ~IDE_DFLAG_NO_UNLOAD;
+				break;
+			case -2:
+				drive->dev_flags |= IDE_DFLAG_NO_UNLOAD;
+				break;
+			}
+		else
+			rc = -EOPNOTSUPP;
+	}
+	mutex_unlock(&ide_setting_mtx);
+
+	return rc ? rc : len;
+}