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authorLinus Torvalds <torvalds@g5.osdl.org>2005-12-18 16:31:56 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2005-12-18 16:31:56 -0800
commit23cb3ada1b011f708ff881b66b2cfb6c11068fa5 (patch)
treec2413fe7180f480b4ecdfd91bdfc0f23ff7df8a5
parent27f4e0834746196f219e3e030ca71ffd3b176483 (diff)
parent16e842a62a8ffcc2e51def6ef9fd6e0926539bc5 (diff)
Merge branch 'for-linus' of master.kernel.org:/pub/scm/linux/kernel/git/scjody/ieee1394
-rw-r--r--drivers/ieee1394/hosts.h1
-rw-r--r--drivers/ieee1394/nodemgr.c67
2 files changed, 58 insertions, 10 deletions
diff --git a/drivers/ieee1394/hosts.h b/drivers/ieee1394/hosts.h
index 38f42112dff0..ae9b02cc013f 100644
--- a/drivers/ieee1394/hosts.h
+++ b/drivers/ieee1394/hosts.h
@@ -41,6 +41,7 @@ struct hpsb_host {
/* this nodes state */
unsigned in_bus_reset:1;
unsigned is_shutdown:1;
+ unsigned resume_packet_sent:1;
/* this nodes' duties on the bus */
unsigned is_root:1;
diff --git a/drivers/ieee1394/nodemgr.c b/drivers/ieee1394/nodemgr.c
index 7fff5a1d2ea4..0ea37b1bccb2 100644
--- a/drivers/ieee1394/nodemgr.c
+++ b/drivers/ieee1394/nodemgr.c
@@ -1349,6 +1349,33 @@ static void nodemgr_update_pdrv(struct node_entry *ne)
}
+/* Write the BROADCAST_CHANNEL as per IEEE1394a 8.3.2.3.11 and 8.4.2.3. This
+ * seems like an optional service but in the end it is practically mandatory
+ * as a consequence of these clauses.
+ *
+ * Note that we cannot do a broadcast write to all nodes at once because some
+ * pre-1394a devices would hang. */
+static void nodemgr_irm_write_bc(struct node_entry *ne, int generation)
+{
+ const u64 bc_addr = (CSR_REGISTER_BASE | CSR_BROADCAST_CHANNEL);
+ quadlet_t bc_remote, bc_local;
+ int ret;
+
+ if (!ne->host->is_irm || ne->generation != generation ||
+ ne->nodeid == ne->host->node_id)
+ return;
+
+ bc_local = cpu_to_be32(ne->host->csr.broadcast_channel);
+
+ /* Check if the register is implemented and 1394a compliant. */
+ ret = hpsb_read(ne->host, ne->nodeid, generation, bc_addr, &bc_remote,
+ sizeof(bc_remote));
+ if (!ret && bc_remote & cpu_to_be32(0x80000000) &&
+ bc_remote != bc_local)
+ hpsb_node_write(ne, bc_addr, &bc_local, sizeof(bc_local));
+}
+
+
static void nodemgr_probe_ne(struct host_info *hi, struct node_entry *ne, int generation)
{
struct device *dev;
@@ -1360,6 +1387,8 @@ static void nodemgr_probe_ne(struct host_info *hi, struct node_entry *ne, int ge
if (!dev)
return;
+ nodemgr_irm_write_bc(ne, generation);
+
/* If "needs_probe", then this is either a new or changed node we
* rescan totally. If the generation matches for an existing node
* (one that existed prior to the bus reset) we send update calls
@@ -1413,9 +1442,25 @@ static void nodemgr_node_probe(struct host_info *hi, int generation)
return;
}
-/* Because we are a 1394a-2000 compliant IRM, we need to inform all the other
- * nodes of the broadcast channel. (Really we're only setting the validity
- * bit). Other IRM responsibilities go in here as well. */
+static int nodemgr_send_resume_packet(struct hpsb_host *host)
+{
+ struct hpsb_packet *packet;
+ int ret = 1;
+
+ packet = hpsb_make_phypacket(host,
+ 0x003c0000 | NODEID_TO_NODE(host->node_id) << 24);
+ if (packet) {
+ packet->no_waiter = 1;
+ packet->generation = get_hpsb_generation(host);
+ ret = hpsb_send_packet(packet);
+ }
+ if (ret)
+ HPSB_WARN("fw-host%d: Failed to broadcast resume packet",
+ host->id);
+ return ret;
+}
+
+/* Perform a few high-level IRM responsibilities. */
static int nodemgr_do_irm_duties(struct hpsb_host *host, int cycles)
{
quadlet_t bc;
@@ -1424,13 +1469,8 @@ static int nodemgr_do_irm_duties(struct hpsb_host *host, int cycles)
if (!host->is_irm || host->irm_id == (nodeid_t)-1)
return 1;
- host->csr.broadcast_channel |= 0x40000000; /* set validity bit */
-
- bc = cpu_to_be32(host->csr.broadcast_channel);
-
- hpsb_write(host, LOCAL_BUS | ALL_NODES, get_hpsb_generation(host),
- (CSR_REGISTER_BASE | CSR_BROADCAST_CHANNEL),
- &bc, sizeof(quadlet_t));
+ /* We are a 1394a-2000 compliant IRM. Set the validity bit. */
+ host->csr.broadcast_channel |= 0x40000000;
/* If there is no bus manager then we should set the root node's
* force_root bit to promote bus stability per the 1394
@@ -1463,6 +1503,13 @@ static int nodemgr_do_irm_duties(struct hpsb_host *host, int cycles)
}
}
+ /* Some devices suspend their ports while being connected to an inactive
+ * host adapter, i.e. if connected before the low-level driver is
+ * loaded. They become visible either when physically unplugged and
+ * replugged, or when receiving a resume packet. Send one once. */
+ if (!host->resume_packet_sent && !nodemgr_send_resume_packet(host))
+ host->resume_packet_sent = 1;
+
return 1;
}