ide: move device settings code to ide-devsets.c

Remove stale comment from ide.c while at it.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

1 files changed, 190 insertions, 0 deletions

diff --git a/drivers/ide/ide-devsets.c b/drivers/ide/ide-devsets.c
new file mode 100644
index 00000000000..7c3953414d4
--- /dev/null
+++ b/drivers/ide/ide-devsets.c
@@ -0,0 +1,190 @@
+
+#include <linux/kernel.h>
+#include <linux/ide.h>
+
+DEFINE_MUTEX(ide_setting_mtx);
+
+ide_devset_get(io_32bit, io_32bit);
+
+static int set_io_32bit(ide_drive_t *drive, int arg)
+{
+	if (drive->dev_flags & IDE_DFLAG_NO_IO_32BIT)
+		return -EPERM;
+
+	if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1))
+		return -EINVAL;
+
+	drive->io_32bit = arg;
+
+	return 0;
+}
+
+ide_devset_get_flag(ksettings, IDE_DFLAG_KEEP_SETTINGS);
+
+static int set_ksettings(ide_drive_t *drive, int arg)
+{
+	if (arg < 0 || arg > 1)
+		return -EINVAL;
+
+	if (arg)
+		drive->dev_flags |= IDE_DFLAG_KEEP_SETTINGS;
+	else
+		drive->dev_flags &= ~IDE_DFLAG_KEEP_SETTINGS;
+
+	return 0;
+}
+
+ide_devset_get_flag(using_dma, IDE_DFLAG_USING_DMA);
+
+static int set_using_dma(ide_drive_t *drive, int arg)
+{
+#ifdef CONFIG_BLK_DEV_IDEDMA
+	int err = -EPERM;
+
+	if (arg < 0 || arg > 1)
+		return -EINVAL;
+
+	if (ata_id_has_dma(drive->id) == 0)
+		goto out;
+
+	if (drive->hwif->dma_ops == NULL)
+		goto out;
+
+	err = 0;
+
+	if (arg) {
+		if (ide_set_dma(drive))
+			err = -EIO;
+	} else
+		ide_dma_off(drive);
+
+out:
+	return err;
+#else
+	if (arg < 0 || arg > 1)
+		return -EINVAL;
+
+	return -EPERM;
+#endif
+}
+
+/*
+ * handle HDIO_SET_PIO_MODE ioctl abusers here, eventually it will go away
+ */
+static int set_pio_mode_abuse(ide_hwif_t *hwif, u8 req_pio)
+{
+	switch (req_pio) {
+	case 202:
+	case 201:
+	case 200:
+	case 102:
+	case 101:
+	case 100:
+		return (hwif->host_flags & IDE_HFLAG_ABUSE_DMA_MODES) ? 1 : 0;
+	case 9:
+	case 8:
+		return (hwif->host_flags & IDE_HFLAG_ABUSE_PREFETCH) ? 1 : 0;
+	case 7:
+	case 6:
+		return (hwif->host_flags & IDE_HFLAG_ABUSE_FAST_DEVSEL) ? 1 : 0;
+	default:
+		return 0;
+	}
+}
+
+static int set_pio_mode(ide_drive_t *drive, int arg)
+{
+	ide_hwif_t *hwif = drive->hwif;
+	const struct ide_port_ops *port_ops = hwif->port_ops;
+
+	if (arg < 0 || arg > 255)
+		return -EINVAL;
+
+	if (port_ops == NULL || port_ops->set_pio_mode == NULL ||
+	    (hwif->host_flags & IDE_HFLAG_NO_SET_MODE))
+		return -ENOSYS;
+
+	if (set_pio_mode_abuse(drive->hwif, arg)) {
+		if (arg == 8 || arg == 9) {
+			unsigned long flags;
+
+			/* take lock for IDE_DFLAG_[NO_]UNMASK/[NO_]IO_32BIT */
+			spin_lock_irqsave(&hwif->lock, flags);
+			port_ops->set_pio_mode(drive, arg);
+			spin_unlock_irqrestore(&hwif->lock, flags);
+		} else
+			port_ops->set_pio_mode(drive, arg);
+	} else {
+		int keep_dma = !!(drive->dev_flags & IDE_DFLAG_USING_DMA);
+
+		ide_set_pio(drive, arg);
+
+		if (hwif->host_flags & IDE_HFLAG_SET_PIO_MODE_KEEP_DMA) {
+			if (keep_dma)
+				ide_dma_on(drive);
+		}
+	}
+
+	return 0;
+}
+
+ide_devset_get_flag(unmaskirq, IDE_DFLAG_UNMASK);
+
+static int set_unmaskirq(ide_drive_t *drive, int arg)
+{
+	if (drive->dev_flags & IDE_DFLAG_NO_UNMASK)
+		return -EPERM;
+
+	if (arg < 0 || arg > 1)
+		return -EINVAL;
+
+	if (arg)
+		drive->dev_flags |= IDE_DFLAG_UNMASK;
+	else
+		drive->dev_flags &= ~IDE_DFLAG_UNMASK;
+
+	return 0;
+}
+
+ide_ext_devset_rw_sync(io_32bit, io_32bit);
+ide_ext_devset_rw_sync(keepsettings, ksettings);
+ide_ext_devset_rw_sync(unmaskirq, unmaskirq);
+ide_ext_devset_rw_sync(using_dma, using_dma);
+__IDE_DEVSET(pio_mode, DS_SYNC, NULL, set_pio_mode);
+
+int ide_devset_execute(ide_drive_t *drive, const struct ide_devset *setting,
+		       int arg)
+{
+	struct request_queue *q = drive->queue;
+	struct request *rq;
+	int ret = 0;
+
+	if (!(setting->flags & DS_SYNC))
+		return setting->set(drive, arg);
+
+	rq = blk_get_request(q, READ, __GFP_WAIT);
+	rq->cmd_type = REQ_TYPE_SPECIAL;
+	rq->cmd_len = 5;
+	rq->cmd[0] = REQ_DEVSET_EXEC;
+	*(int *)&rq->cmd[1] = arg;
+	rq->special = setting->set;
+
+	if (blk_execute_rq(q, NULL, rq, 0))
+		ret = rq->errors;
+	blk_put_request(rq);
+
+	return ret;
+}
+
+ide_startstop_t ide_do_devset(ide_drive_t *drive, struct request *rq)
+{
+	int err, (*setfunc)(ide_drive_t *, int) = rq->special;
+
+	err = setfunc(drive, *(int *)&rq->cmd[1]);
+	if (err)
+		rq->errors = err;
+	else
+		err = 1;
+	ide_end_request(drive, err, 0);
+	return ide_stopped;
+}