[POWERPC] iSeries: Move detection of virtual tapes

Now we will only have entries in the device tree for the actual existing
devices (including their OS/400 properties).  This way viotape.c gets
all the information about the devices from the device tree.

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>

drivers/char/viotape.c

@@ -92,47 +92,6 @@ struct viot_devinfo_struct {
 #define VIOTAPOP_SETPART       14
 #define VIOTAPOP_UNLOAD        15
 
-struct viotapelpevent {
-	struct HvLpEvent event;
-	u32 reserved;
-	u16 version;
-	u16 sub_type_result;
-	u16 tape;
-	u16 flags;
-	u32 token;
-	u64 len;
-	union {
-		struct {
-			u32 tape_op;
-			u32 count;
-		} op;
-		struct {
-			u32 type;
-			u32 resid;
-			u32 dsreg;
-			u32 gstat;
-			u32 erreg;
-			u32 file_no;
-			u32 block_no;
-		} get_status;
-		struct {
-			u32 block_no;
-		} get_pos;
-	} u;
-};
-
-enum viotapesubtype {
-	viotapeopen = 0x0001,
-	viotapeclose = 0x0002,
-	viotaperead = 0x0003,
-	viotapewrite = 0x0004,
-	viotapegetinfo = 0x0005,
-	viotapeop = 0x0006,
-	viotapegetpos = 0x0007,
-	viotapesetpos = 0x0008,
-	viotapegetstatus = 0x0009
-};
-
 enum viotaperc {
 	viotape_InvalidRange = 0x0601,
 	viotape_InvalidToken = 0x0602,
@@ -223,14 +182,11 @@ static const struct vio_error_entry viotape_err_table[] = {
 #define VIOT_WRITING		2
 
 /* Our info on the tapes */
-struct tape_descr {
-	char rsrcname[10];
-	char type[4];
-	char model[3];
-};
-
-static struct tape_descr *viotape_unitinfo;
-static dma_addr_t viotape_unitinfo_token;
+static struct {
+	const char *rsrcname;
+	const char *type;
+	const char *model;
+} viotape_unitinfo[VIOTAPE_MAX_TAPE];
 
 static struct mtget viomtget[VIOTAPE_MAX_TAPE];
 
@@ -381,53 +337,6 @@ int tape_rc_to_errno(int tape_rc, char *operation, int tapeno)
 	return -err->errno;
 }
 
-/* Get info on all tapes from OS/400 */
-static int get_viotape_info(void)
-{
-	HvLpEvent_Rc hvrc;
-	int i;
-	size_t len = sizeof(*viotape_unitinfo) * VIOTAPE_MAX_TAPE;
-	struct op_struct *op = get_op_struct();
-
-	if (op == NULL)
-		return -ENOMEM;
-
-	viotape_unitinfo = iseries_hv_alloc(len, &viotape_unitinfo_token,
-		GFP_ATOMIC);
-	if (viotape_unitinfo == NULL) {
-		free_op_struct(op);
-		return -ENOMEM;
-	}
-
-	memset(viotape_unitinfo, 0, len);
-
-	hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
-			HvLpEvent_Type_VirtualIo,
-			viomajorsubtype_tape | viotapegetinfo,
-			HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
-			viopath_sourceinst(viopath_hostLp),
-			viopath_targetinst(viopath_hostLp),
-			(u64) (unsigned long) op, VIOVERSION << 16,
-			viotape_unitinfo_token, len, 0, 0);
-	if (hvrc != HvLpEvent_Rc_Good) {
-		printk(VIOTAPE_KERN_WARN "hv error on op %d\n",
-				(int)hvrc);
-		free_op_struct(op);
-		return -EIO;
-	}
-
-	wait_for_completion(&op->com);
-
-	free_op_struct(op);
-
-	for (i = 0;
-	     ((i < VIOTAPE_MAX_TAPE) && (viotape_unitinfo[i].rsrcname[0]));
-	     i++)
-		viotape_numdev++;
-	return 0;
-}
-
-
 /* Write */
 static ssize_t viotap_write(struct file *file, const char *buf,
 		size_t count, loff_t * ppos)
@@ -899,7 +808,6 @@ static void vioHandleTapeEvent(struct HvLpEvent *event)
 	tapeminor = event->xSubtype & VIOMINOR_SUBTYPE_MASK;
 	op = (struct op_struct *)event->xCorrelationToken;
 	switch (tapeminor) {
-	case viotapegetinfo:
 	case viotapeopen:
 	case viotapeclose:
 		op->rc = tevent->sub_type_result;
@@ -942,11 +850,23 @@ static int viotape_probe(struct vio_dev *vdev, const struct vio_device_id *id)
 {
 	int i = vdev->unit_address;
 	int j;
+	struct device_node *node = vdev->dev.archdata.of_node;
 
-	if (i >= viotape_numdev)
+	if (i > VIOTAPE_MAX_TAPE)
+		return -ENODEV;
+	if (!node)
 		return -ENODEV;
 
+	if (i >= viotape_numdev)
+		viotape_numdev = i + 1;
+
 	tape_device[i] = &vdev->dev;
+	viotape_unitinfo[i].rsrcname = of_get_property(node,
+					"linux,vio_rsrcname", NULL);
+	viotape_unitinfo[i].type = of_get_property(node, "linux,vio_type",
+					NULL);
+	viotape_unitinfo[i].model = of_get_property(node, "linux,vio_model",
+					NULL);
 
 	state[i].cur_part = 0;
 	for (j = 0; j < MAX_PARTITIONS; ++j)
@@ -1044,11 +964,6 @@ int __init viotap_init(void)
 		goto unreg_chrdev;
 	}
 
-	if ((ret = get_viotape_info()) < 0) {
-		printk(VIOTAPE_KERN_WARN "Unable to obtain virtual device information");
-		goto unreg_class;
-	}
-
 	ret = vio_register_driver(&viotape_driver);
 	if (ret)
 		goto unreg_class;
@@ -1102,9 +1017,6 @@ static void __exit viotap_exit(void)
 	vio_unregister_driver(&viotape_driver);
 	class_destroy(tape_class);
 	unregister_chrdev(VIOTAPE_MAJOR, "viotape");
-	if (viotape_unitinfo)
-		iseries_hv_free(sizeof(viotape_unitinfo[0]) * VIOTAPE_MAX_TAPE,
-				viotape_unitinfo, viotape_unitinfo_token);
 	viopath_close(viopath_hostLp, viomajorsubtype_tape, VIOTAPE_MAXREQ + 2);
 	vio_clearHandler(viomajorsubtype_tape);
 	clear_op_struct_pool();