diff options
Diffstat (limited to 'drivers/firewire/fw-card.c')
| -rw-r--r-- | drivers/firewire/fw-card.c | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/drivers/firewire/fw-card.c b/drivers/firewire/fw-card.c index d8abd70ce84..79773907e10 100644 --- a/drivers/firewire/fw-card.c +++ b/drivers/firewire/fw-card.c @@ -24,6 +24,7 @@ #include <linux/device.h> #include "fw-transaction.h" #include "fw-topology.h" +#include "fw-device.h" /* The lib/crc16.c implementation uses the standard (0x8005) * polynomial, but we need the ITU-T (or CCITT) polynomial (0x1021). @@ -186,6 +187,59 @@ fw_core_remove_descriptor (struct fw_descriptor *desc) EXPORT_SYMBOL(fw_core_remove_descriptor); static void +fw_card_irm_work(struct work_struct *work) +{ + struct fw_card *card = + container_of(work, struct fw_card, work.work); + struct fw_device *root; + unsigned long flags; + int new_irm_id, generation; + + /* FIXME: This simple bus management unconditionally picks a + * cycle master if the current root can't do it. We need to + * not do this if there is a bus manager already. Also, some + * hubs set the contender bit, which is bogus, so we should + * probably do a little sanity check on the IRM (like, read + * the bandwidth register) if it's not us. */ + + spin_lock_irqsave(&card->lock, flags); + + generation = card->generation; + root = card->root_node->data; + + if (root == NULL) + /* Either link_on is false, or we failed to read the + * config rom. In either case, pick another root. */ + new_irm_id = card->local_node->node_id; + else if (root->state != FW_DEVICE_RUNNING) + /* If we haven't probed this device yet, bail out now + * and let's try again once that's done. */ + new_irm_id = -1; + else if (root->config_rom[2] & bib_cmc) + /* FIXME: I suppose we should set the cmstr bit in the + * STATE_CLEAR register of this node, as described in + * 1394-1995, 8.4.2.6. Also, send out a force root + * packet for this node. */ + new_irm_id = -1; + else + /* Current root has an active link layer and we + * successfully read the config rom, but it's not + * cycle master capable. */ + new_irm_id = card->local_node->node_id; + + if (card->irm_retries++ > 5) + new_irm_id = -1; + + spin_unlock_irqrestore(&card->lock, flags); + + if (new_irm_id > 0) { + fw_notify("Trying to become root (card %d)\n", card->index); + fw_send_force_root(card, new_irm_id, generation); + fw_core_initiate_bus_reset(card, 1); + } +} + +static void release_card(struct device *device) { struct fw_card *card = @@ -222,6 +276,8 @@ fw_card_initialize(struct fw_card *card, struct fw_card_driver *driver, card->local_node = NULL; + INIT_DELAYED_WORK(&card->work, fw_card_irm_work); + card->card_device.bus = &fw_bus_type; card->card_device.release = release_card; card->card_device.parent = card->device; |