firewire: consistent usage of node_id

Definitions as per IEEE 1212 and IEEE 1394:

     Node ID: Concatenation of bus ID and local ID. 16 bits long.
      Bus ID: Identifies a particular bus within a group of buses
              interconnected by bus bridges.
    Local ID: Identifies a particular node on a bus.
      PHY ID: Local ID of IEEE 1394 nodes. 6 bits long.

Never ever use a variable called node_id for anything else than a node ID.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

6 files changed, 23 insertions, 20 deletions

diff --git a/drivers/firewire/fw-device-cdev.c b/drivers/firewire/fw-device-cdev.c
index 5ffc58c6624c..1b9e5f7c0129 100644
--- a/drivers/firewire/fw-device-cdev.c
+++ b/drivers/firewire/fw-device-cdev.c
@@ -238,7 +238,7 @@ static ssize_t ioctl_send_request(struct client *client, void __user *arg)
 
         fw_send_request(device->card, &response->transaction,
                         request.tcode,
-                        device->node->node_id | LOCAL_BUS,
+                        device->node->node_id,
                         device->card->generation,
                         device->node->max_speed,
                         request.offset,
diff --git a/drivers/firewire/fw-device.c b/drivers/firewire/fw-device.c
index f1b0e75fd91e..4fb5587252a9 100644
--- a/drivers/firewire/fw-device.c
+++ b/drivers/firewire/fw-device.c
@@ -257,7 +257,7 @@ static int read_rom(struct fw_device *device, int index, u32 * data)
 
         offset = 0xfffff0000400ULL + index * 4;
         fw_send_request(device->card, &t, TCODE_READ_QUADLET_REQUEST,
-                        device->node_id | LOCAL_BUS,
+                        device->node_id,
                         device->generation, SCODE_100,
                         offset, NULL, 4, complete_transaction, &callback_data);
 
@@ -447,7 +447,7 @@ static void fw_device_init(struct work_struct *work)
                         device->config_rom_retries++;
                         schedule_delayed_work(&device->work, RETRY_DELAY);
                 } else {
-                        fw_notify("giving up on config rom for node id %d\n",
+                        fw_notify("giving up on config rom for node id %x\n",
                                   device->node_id);
                         fw_device_release(&device->device);
                 }
diff --git a/drivers/firewire/fw-ohci.c b/drivers/firewire/fw-ohci.c
index ba10203725c1..d6f0644b05d4 100644
--- a/drivers/firewire/fw-ohci.c
+++ b/drivers/firewire/fw-ohci.c
@@ -828,10 +828,10 @@ ohci_enable_phys_dma(struct fw_card *card, int node_id, int generation)
 {
         struct fw_ohci *ohci = fw_ohci(card);
         unsigned long flags;
-        int retval = 0;
+        int n, retval = 0;
 
-        /* FIXME: make sure this bitmask is cleared when we clear the
-         * busReset interrupt bit. */
+        /* FIXME:  Make sure this bitmask is cleared when we clear the busReset
+         * interrupt bit.  Clear physReqResourceAllBuses on bus reset. */
 
         spin_lock_irqsave(&ohci->lock, flags);
 
@@ -840,12 +840,15 @@ ohci_enable_phys_dma(struct fw_card *card, int node_id, int generation)
                 goto out;
         }
 
-        if (node_id < 32) {
-                reg_write(ohci, OHCI1394_PhyReqFilterLoSet, 1 << node_id);
-        } else {
-                reg_write(ohci, OHCI1394_PhyReqFilterHiSet,
-                          1 << (node_id - 32));
-        }
+        /* NOTE, if the node ID contains a non-local bus ID, physical DMA is
+         * enabled for _all_ nodes on remote buses. */
+
+        n = (node_id & 0xffc0) == LOCAL_BUS ? node_id & 0x3f : 63;
+        if (n < 32)
+                reg_write(ohci, OHCI1394_PhyReqFilterLoSet, 1 << n);
+        else
+                reg_write(ohci, OHCI1394_PhyReqFilterHiSet, 1 << (n - 32));
+
         flush_writes(ohci);
  out:
         spin_unlock_irqrestore(&ohci->lock, flags);
diff --git a/drivers/firewire/fw-sbp2.c b/drivers/firewire/fw-sbp2.c
index f5c46822b7d8..4e42b73f1e3e 100644
--- a/drivers/firewire/fw-sbp2.c
+++ b/drivers/firewire/fw-sbp2.c
@@ -328,7 +328,7 @@ sbp2_send_orb(struct sbp2_orb *orb, struct fw_unit *unit,
         spin_unlock_irqrestore(&device->card->lock, flags);
 
         fw_send_request(device->card, &orb->t, TCODE_WRITE_BLOCK_REQUEST,
-                        node_id | LOCAL_BUS, generation,
+                        node_id, generation,
                         device->node->max_speed, offset,
                         &orb->pointer, sizeof orb->pointer,
                         complete_transaction, orb);
@@ -485,7 +485,7 @@ static int sbp2_agent_reset(struct fw_unit *unit)
                 return -ENOMEM;
 
         fw_send_request(device->card, t, TCODE_WRITE_QUADLET_REQUEST,
-                        sd->node_id | LOCAL_BUS, sd->generation, SCODE_400,
+                        sd->node_id, sd->generation, SCODE_400,
                         sd->command_block_agent_address + SBP2_AGENT_RESET,
                         &zero, sizeof zero, complete_agent_reset_write, t);
 
@@ -586,7 +586,7 @@ static int sbp2_probe(struct device *dev)
 
         sd->generation   = generation;
         sd->node_id      = node_id;
-        sd->address_high = (LOCAL_BUS | local_node_id) << 16;
+        sd->address_high = local_node_id << 16;
 
         /* Get command block agent offset and login id. */
         sd->command_block_agent_address =
@@ -663,7 +663,7 @@ static void sbp2_reconnect(struct work_struct *work)
 
         sd->generation   = generation;
         sd->node_id      = node_id;
-        sd->address_high = (LOCAL_BUS | local_node_id) << 16;
+        sd->address_high = local_node_id << 16;
 }
 
 static void sbp2_update(struct fw_unit *unit)
diff --git a/drivers/firewire/fw-topology.c b/drivers/firewire/fw-topology.c
index 1938f36cfaa3..684d87d99775 100644
--- a/drivers/firewire/fw-topology.c
+++ b/drivers/firewire/fw-topology.c
@@ -102,7 +102,7 @@ static struct fw_node *fw_node_create(u32 sid, int port_count, int color)
                 return NULL;
 
         node->color = color;
-        node->node_id = self_id_phy_id(sid);
+        node->node_id = LOCAL_BUS | self_id_phy_id(sid);
         node->link_on = self_id_link_on(sid);
         node->phy_speed = self_id_phy_speed(sid);
         node->port_count = port_count;
diff --git a/drivers/firewire/fw-transaction.c b/drivers/firewire/fw-transaction.c
index 4c1275f9a3b4..439a3e3ee2f0 100644
--- a/drivers/firewire/fw-transaction.c
+++ b/drivers/firewire/fw-transaction.c
@@ -56,7 +56,7 @@
 #define header_get_extended_tcode(q)    (((q) >> 0) & 0xffff)
 
 #define phy_config_gap_count(gap_count) (((gap_count) << 16) | (1 << 22))
-#define phy_config_root_id(node_id)     (((node_id) << 24) | (1 << 23))
+#define phy_config_root_id(node_id)     ((((node_id) & 0x3f) << 24) | (1 << 23))
 #define phy_identifier(id)              ((id) << 30)
 
 static void
@@ -123,7 +123,7 @@ fw_fill_packet(struct fw_packet *packet, int tcode, int tlabel,
                 header_retry(RETRY_X) |
                 header_tlabel(tlabel) |
                 header_tcode(tcode) |
-                header_destination(node_id | LOCAL_BUS);
+                header_destination(node_id);
         packet->header[1] =
                 header_offset_high(offset >> 32) | header_source(0);
         packet->header[2] =
@@ -190,7 +190,7 @@ fw_fill_packet(struct fw_packet *packet, int tcode, int tlabel,
  * @param tcode the tcode for this transaction.  Do not use
  *   TCODE_LOCK_REQUEST directly, insted use TCODE_LOCK_MASK_SWAP
  *   etc. to specify tcode and ext_tcode.
- * @param node_id the node_id of the destination node
+ * @param node_id the destination node ID (bus ID and PHY ID concatenated)
  * @param generation the generation for which node_id is valid
  * @param speed the speed to use for sending the request
  * @param offset the 48 bit offset on the destination node