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path: root/drivers/firewire/fw-card.c
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Diffstat (limited to 'drivers/firewire/fw-card.c')
-rw-r--r--drivers/firewire/fw-card.c172
1 files changed, 166 insertions, 6 deletions
diff --git a/drivers/firewire/fw-card.c b/drivers/firewire/fw-card.c
index 08a7e18526ee..f2b363ea443e 100644
--- a/drivers/firewire/fw-card.c
+++ b/drivers/firewire/fw-card.c
@@ -181,6 +181,147 @@ void fw_core_remove_descriptor(struct fw_descriptor *desc)
mutex_unlock(&card_mutex);
}
+/* ------------------------------------------------------------------ */
+/* Code to handle 1394a broadcast channel */
+
+#define THIRTY_TWO_CHANNELS (0xFFFFFFFFU)
+#define IRM_RETRIES 2
+
+/*
+ * The abi is set by device_for_each_child(), even though we have no use
+ * for data, nor do we have a meaningful return value.
+ */
+int fw_irm_set_broadcast_channel_register(struct device *dev, void *data)
+{
+ struct fw_device *d;
+ int rcode;
+ int node_id;
+ int max_speed;
+ int retries;
+ int generation;
+ __be32 regval;
+ struct fw_card *card;
+
+ d = fw_device(dev);
+ /* FIXME: do we need locking here? */
+ generation = d->generation;
+ smp_rmb(); /* Ensure generation is at least as old as node_id */
+ node_id = d->node_id;
+ max_speed = d->max_speed;
+ retries = IRM_RETRIES;
+ card = d->card;
+tryagain_r:
+ rcode = fw_run_transaction(card, TCODE_READ_QUADLET_REQUEST,
+ node_id, generation, max_speed,
+ CSR_REGISTER_BASE + CSR_BROADCAST_CHANNEL,
+ &regval, 4);
+ switch (rcode) {
+ case RCODE_BUSY:
+ if (retries--)
+ goto tryagain_r;
+ fw_notify("node %x read broadcast channel busy\n",
+ node_id);
+ return 0;
+
+ default:
+ fw_notify("node %x read broadcast channel failed %x\n",
+ node_id, rcode);
+ return 0;
+
+ case RCODE_COMPLETE:
+ /*
+ * Paranoid reporting of nonstandard broadcast channel
+ * contents goes here
+ */
+ if (regval != cpu_to_be32(BROADCAST_CHANNEL_INITIAL))
+ return 0;
+ break;
+ }
+ retries = IRM_RETRIES;
+ regval = cpu_to_be32(BROADCAST_CHANNEL_INITIAL |
+ BROADCAST_CHANNEL_VALID);
+tryagain_w:
+ rcode = fw_run_transaction(card,
+ TCODE_WRITE_QUADLET_REQUEST, node_id,
+ generation, max_speed,
+ CSR_REGISTER_BASE + CSR_BROADCAST_CHANNEL,
+ &regval, 4);
+ switch (rcode) {
+ case RCODE_BUSY:
+ if (retries--)
+ goto tryagain_w;
+ fw_notify("node %x write broadcast channel busy\n",
+ node_id);
+ return 0;
+
+ default:
+ fw_notify("node %x write broadcast channel failed %x\n",
+ node_id, rcode);
+ return 0;
+
+ case RCODE_COMPLETE:
+ return 0;
+ }
+ return 0;
+}
+
+static void
+irm_allocate_broadcast(struct fw_device *irm_dev, struct device *locald)
+{
+ u32 generation;
+ u32 node_id;
+ u32 max_speed;
+ u32 retries;
+ __be32 old_data;
+ __be32 lock_data[2];
+ int rcode;
+
+ /*
+ * The device we are updating is the IRM, so we must do
+ * some extra work.
+ */
+ retries = IRM_RETRIES;
+ generation = irm_dev->generation;
+ /* FIXME: do we need locking here? */
+ smp_rmb();
+ node_id = irm_dev->node_id;
+ max_speed = irm_dev->max_speed;
+
+ lock_data[0] = cpu_to_be32(THIRTY_TWO_CHANNELS);
+ lock_data[1] = cpu_to_be32(THIRTY_TWO_CHANNELS & ~1);
+tryagain:
+ old_data = lock_data[0];
+ rcode = fw_run_transaction(irm_dev->card, TCODE_LOCK_COMPARE_SWAP,
+ node_id, generation, max_speed,
+ CSR_REGISTER_BASE+CSR_CHANNELS_AVAILABLE_HI,
+ &lock_data[0], 8);
+ switch (rcode) {
+ case RCODE_BUSY:
+ if (retries--)
+ goto tryagain;
+ /* fallthrough */
+ default:
+ fw_error("node %x: allocate broadcast channel failed (%x)\n",
+ node_id, rcode);
+ return;
+
+ case RCODE_COMPLETE:
+ if (lock_data[0] == old_data)
+ break;
+ if (retries--) {
+ lock_data[1] = cpu_to_be32(be32_to_cpu(lock_data[0])&~1);
+ goto tryagain;
+ }
+ fw_error("node %x: allocate broadcast channel failed: too many"
+ " retries\n", node_id);
+ return;
+ }
+ irm_dev->card->is_irm = true;
+ device_for_each_child(locald, NULL, fw_irm_set_broadcast_channel_register);
+}
+/* ------------------------------------------------------------------ */
+
+
static const char gap_count_table[] = {
63, 5, 7, 8, 10, 13, 16, 18, 21, 24, 26, 29, 32, 35, 37, 40
};
@@ -198,8 +339,8 @@ void fw_schedule_bm_work(struct fw_card *card, unsigned long delay)
static void fw_card_bm_work(struct work_struct *work)
{
struct fw_card *card = container_of(work, struct fw_card, work.work);
- struct fw_device *root_device;
- struct fw_node *root_node, *local_node;
+ struct fw_device *root_device, *irm_device, *local_device;
+ struct fw_node *root_node, *local_node, *irm_node;
unsigned long flags;
int root_id, new_root_id, irm_id, gap_count, generation, grace, rcode;
bool do_reset = false;
@@ -208,8 +349,10 @@ static void fw_card_bm_work(struct work_struct *work)
__be32 lock_data[2];
spin_lock_irqsave(&card->lock, flags);
+ card->is_irm = false;
local_node = card->local_node;
root_node = card->root_node;
+ irm_node = card->irm_node;
if (local_node == NULL) {
spin_unlock_irqrestore(&card->lock, flags);
@@ -217,6 +360,7 @@ static void fw_card_bm_work(struct work_struct *work)
}
fw_node_get(local_node);
fw_node_get(root_node);
+ fw_node_get(irm_node);
generation = card->generation;
root_device = root_node->data;
@@ -225,7 +369,8 @@ static void fw_card_bm_work(struct work_struct *work)
root_device_is_cmc = root_device && root_device->cmc;
root_id = root_node->node_id;
grace = time_after(jiffies, card->reset_jiffies + DIV_ROUND_UP(HZ, 10));
-
+ irm_device = irm_node->data;
+ local_device = local_node->data;
if (is_next_generation(generation, card->bm_generation) ||
(card->bm_generation != generation && grace)) {
/*
@@ -240,8 +385,8 @@ static void fw_card_bm_work(struct work_struct *work)
* next generation.
*/
- irm_id = card->irm_node->node_id;
- if (!card->irm_node->link_on) {
+ irm_id = irm_node->node_id;
+ if (!irm_node->link_on) {
new_root_id = local_node->node_id;
fw_notify("IRM has link off, making local node (%02x) root.\n",
new_root_id);
@@ -263,9 +408,15 @@ static void fw_card_bm_work(struct work_struct *work)
goto out;
if (rcode == RCODE_COMPLETE &&
- lock_data[0] != cpu_to_be32(0x3f))
+ lock_data[0] != cpu_to_be32(0x3f)) {
/* Somebody else is BM, let them do the work. */
+ if (irm_id == local_node->node_id) {
+ /* But we are IRM, so do irm-y things */
+ irm_allocate_broadcast(irm_device,
+ card->device);
+ }
goto out;
+ }
spin_lock_irqsave(&card->lock, flags);
@@ -357,10 +508,19 @@ static void fw_card_bm_work(struct work_struct *work)
card->index, new_root_id, gap_count);
fw_send_phy_config(card, new_root_id, generation, gap_count);
fw_core_initiate_bus_reset(card, 1);
+ } else if (irm_node->node_id == local_node->node_id) {
+ /*
+ * We are IRM, so do irm-y things.
+ * There's no reason to do this if we're doing a reset. . .
+ * We'll be back.
+ */
+ irm_allocate_broadcast(irm_device, card->device);
}
+
out:
fw_node_put(root_node);
fw_node_put(local_node);
+ fw_node_put(irm_node);
out_put_card:
fw_card_put(card);
}
generated by cgit v1.2.3 (git 2.0.4) at 2024-11-09 14:50:18 +0000