firewire: Implement topology map and fix a couple of loopback bugs.

Signed-off-by: Kristian Høgsberg <krh@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

drivers/firewire/fw-card.c

@@ -30,7 +30,7 @@
  * polynomial, but we need the ITU-T (or CCITT) polynomial (0x1021).
  * The implementation below works on an array of host-endian u32
  * words, assuming they'll be transmited msb first. */
-static u16
+u16
 crc16_itu_t(const u32 *buffer, size_t length)
 {
 	int shift, i;

drivers/firewire/fw-ohci.c

@@ -813,8 +813,10 @@ handle_local_request(struct context *ctx, struct fw_packet *packet)
 	u64 offset;
 	u32 csr;
 
+	if (ctx == &ctx->ohci->at_request_ctx) {
 		packet->ack = ACK_PENDING;
 		packet->callback(packet, &ctx->ohci->card, packet->ack);
+	}
 
 	offset =
 		((unsigned long long)
@@ -839,6 +841,11 @@ handle_local_request(struct context *ctx, struct fw_packet *packet)
 			fw_core_handle_response(&ctx->ohci->card, packet);
 		break;
 	}
+
+	if (ctx == &ctx->ohci->at_response_ctx) {
+		packet->ack = ACK_COMPLETE;
+		packet->callback(packet, &ctx->ohci->card, packet->ack);
+	}
 }
 
 static void

drivers/firewire/fw-topology.c

@@ -163,11 +163,12 @@ static void update_hop_count(struct fw_node *node)
  * internally consistent.  On succcess this funtions returns the
  * fw_node corresponding to the local card otherwise NULL.
  */
-static struct fw_node *build_tree(struct fw_card *card)
+static struct fw_node *build_tree(struct fw_card *card,
+				  u32 *sid, int self_id_count)
 {
 	struct fw_node *node, *child, *local_node;
 	struct list_head stack, *h;
-	u32 *sid, *next_sid, *end, q;
+	u32 *next_sid, *end, q;
 	int i, port_count, child_port_count, phy_id, parent_count, stack_depth;
 	int gap_count, topology_type;
 
@@ -175,8 +176,7 @@ static struct fw_node *build_tree(struct fw_card *card)
 	node = NULL;
 	INIT_LIST_HEAD(&stack);
 	stack_depth = 0;
-	sid = card->self_ids;
-	end = sid + card->self_id_count;
+	end = sid + self_id_count;
 	phy_id = 0;
 	card->irm_node = NULL;
 	gap_count = self_id_gap_count(*sid);
@@ -460,6 +460,20 @@ update_tree(struct fw_card *card, struct fw_node *root)
 	}
 }
 
+static void
+update_topology_map(struct fw_card *card, u32 *self_ids, int self_id_count)
+{
+	int node_count;
+	u32 crc;
+
+	card->topology_map[1]++;
+	node_count = (card->root_node->node_id & 0x3f) + 1;
+	card->topology_map[2] = (node_count << 16) | self_id_count;
+	crc = crc16_itu_t(card->topology_map + 1, self_id_count + 2);
+	card->topology_map[0] = ((self_id_count + 2) << 16) | crc;
+	memcpy(&card->topology_map[3], self_ids, self_id_count * 4);
+}
+
 void
 fw_core_handle_bus_reset(struct fw_card *card,
 			 int node_id, int generation,
@@ -479,13 +493,13 @@ fw_core_handle_bus_reset(struct fw_card *card,
 		card->bm_retries = 0;
 
 	card->node_id = node_id;
-	card->self_id_count = self_id_count;
 	card->generation = generation;
-	memcpy(card->self_ids, self_ids, self_id_count * 4);
 	card->reset_jiffies = jiffies;
 	schedule_delayed_work(&card->work, 0);
 
-	local_node = build_tree(card);
+	local_node = build_tree(card, self_ids, self_id_count);
+
+	update_topology_map(card, self_ids, self_id_count);
 
 	card->color++;
 

drivers/firewire/fw-topology.h

@@ -88,4 +88,7 @@ fw_node_put(struct fw_node *node)
 void
 fw_destroy_nodes(struct fw_card *card);
 
+u16
+crc16_itu_t(const u32 *buffer, size_t length);
+
 #endif /* __fw_topology_h */

drivers/firewire/fw-transaction.c

@@ -140,7 +140,7 @@ transmit_complete_callback(struct fw_packet *packet,
 
 static void
 fw_fill_request(struct fw_packet *packet, int tcode, int tlabel,
-		int node_id, int generation, int speed,
+		int node_id, int source_id, int generation, int speed,
 		unsigned long long offset, void *payload, size_t length)
 {
 	int ext_tcode;
@@ -157,7 +157,7 @@ fw_fill_request(struct fw_packet *packet, int tcode, int tlabel,
 		header_tcode(tcode) |
 		header_destination(node_id);
 	packet->header[1] =
-		header_offset_high(offset >> 32) | header_source(0);
+		header_offset_high(offset >> 32) | header_source(source_id);
 	packet->header[2] =
 		offset;
 
@@ -241,7 +241,7 @@ fw_send_request(struct fw_card *card, struct fw_transaction *t,
 		fw_transaction_callback_t callback, void *callback_data)
 {
 	unsigned long flags;
-	int tlabel;
+	int tlabel, source;
 
 	/* Bump the flush timer up 100ms first of all so we
 	 * don't race with a flush timer callback. */
@@ -253,6 +253,7 @@ fw_send_request(struct fw_card *card, struct fw_transaction *t,
 
 	spin_lock_irqsave(&card->lock, flags);
 
+	source = card->node_id;
 	tlabel = card->current_tlabel;
 	if (card->tlabel_mask & (1 << tlabel)) {
 		spin_unlock_irqrestore(&card->lock, flags);
@@ -274,7 +275,8 @@ fw_send_request(struct fw_card *card, struct fw_transaction *t,
 	t->callback_data = callback_data;
 
 	fw_fill_request(&t->packet, tcode, t->tlabel,
-			node_id, generation, speed, offset, payload, length);
+			node_id, source, generation,
+			speed, offset, payload, length);
 	t->packet.callback = transmit_complete_callback;
 
 	card->driver->send_request(card, &t->packet);
@@ -716,6 +718,44 @@ fw_core_handle_response(struct fw_card *card, struct fw_packet *p)
 }
 EXPORT_SYMBOL(fw_core_handle_response);
 
+const struct fw_address_region topology_map_region =
+	{ .start = 0xfffff0001000ull, .end = 0xfffff0001400ull, };
+
+static void
+handle_topology_map(struct fw_card *card, struct fw_request *request,
+		    int tcode, int destination, int source,
+		    int generation, int speed,
+		    unsigned long long offset,
+		    void *payload, size_t length, void *callback_data)
+{
+	int i, start, end;
+	u32 *map;
+
+	if (!TCODE_IS_READ_REQUEST(tcode)) {
+		fw_send_response(card, request, RCODE_TYPE_ERROR);
+		return;
+	}
+
+	if ((offset & 3) > 0 || (length & 3) > 0) {
+		fw_send_response(card, request, RCODE_ADDRESS_ERROR);
+		return;
+	}
+
+	start = (offset - topology_map_region.start) / 4;
+	end = start + length / 4;
+	map = payload;
+
+	for (i = 0; i < length / 4; i++)
+		map[i] = cpu_to_be32(card->topology_map[start + i]);
+
+	fw_send_response(card, request, RCODE_COMPLETE);
+}
+
+static struct fw_address_handler topology_map = {
+	.length			= 0x400,
+	.address_callback	= handle_topology_map,
+};
+
 MODULE_AUTHOR("Kristian Hoegsberg <krh@bitplanet.net>");
 MODULE_DESCRIPTION("Core IEEE1394 transaction logic");
 MODULE_LICENSE("GPL");
@@ -767,6 +807,10 @@ static int __init fw_core_init(void)
 		return fw_cdev_major;
 	}
 
+	retval = fw_core_add_address_handler(&topology_map,
+					     &topology_map_region);
+	BUG_ON(retval < 0);
+
 	/* Add the vendor textual descriptor. */
 	retval = fw_core_add_descriptor(&vendor_id_descriptor);
 	BUG_ON(retval < 0);

drivers/firewire/fw-transaction.h

@@ -285,9 +285,10 @@ struct fw_card {
 	int link_speed;
 	int config_rom_generation;
 
-	/* We need to store up to 4 self ID for a maximum of 63 devices. */
+	/* We need to store up to 4 self ID for a maximum of 63
+	 * devices plus 3 words for the topology map header. */
 	int self_id_count;
-	u32 self_ids[252];
+	u32 topology_map[252 + 3];
 
 	spinlock_t lock; /* Take this lock when handling the lists in
 			  * this struct. */