+#if 0 /* FIXME */
+/* search for the right schedule branch to use for a periodic ed.
+ * does some load balancing; returns the branch, or negative errno.
+ */
+static int balance(struct admhcd *ahcd, int interval, int load)
+{
+ int i, branch = -ENOSPC;
+
+ /* iso periods can be huge; iso tds specify frame numbers */
+ if (interval > NUM_INTS)
+ interval = NUM_INTS;
+
+ /* search for the least loaded schedule branch of that period
+ * that has enough bandwidth left unreserved.
+ */
+ for (i = 0; i < interval ; i++) {
+ if (branch < 0 || ahcd->load[branch] > ahcd->load[i]) {
+ int j;
+
+ /* usb 1.1 says 90% of one frame */
+ for (j = i; j < NUM_INTS; j += interval) {
+ if ((ahcd->load[j] + load) > 900)
+ break;
+ }
+ if (j < NUM_INTS)
+ continue;
+ branch = i;
+ }
+ }
+ return branch;
+}
+#endif
+
+/*-------------------------------------------------------------------------*/
+
+#if 0 /* FIXME */
+/* both iso and interrupt requests have periods; this routine puts them
+ * into the schedule tree in the apppropriate place. most iso devices use
+ * 1msec periods, but that's not required.
+ */
+static void periodic_link(struct admhcd *ahcd, struct ed *ed)
+{
+ unsigned i;
+
+ admhc_vdbg(ahcd, "link %sed %p branch %d [%dus.], interval %d\n",
+ (ed->hwINFO & cpu_to_hc32(ahcd, ED_ISO)) ? "iso " : "",
+ ed, ed->branch, ed->load, ed->interval);
+
+ for (i = ed->branch; i < NUM_INTS; i += ed->interval) {
+ struct ed **prev = &ahcd->periodic[i];
+ __hc32 *prev_p = &ahcd->hcca->int_table[i];
+ struct ed *here = *prev;
+
+ /* sorting each branch by period (slow before fast)
+ * lets us share the faster parts of the tree.
+ * (plus maybe: put interrupt eds before iso)
+ */
+ while (here && ed != here) {
+ if (ed->interval > here->interval)
+ break;
+ prev = &here->ed_next;
+ prev_p = &here->hwNextED;
+ here = *prev;
+ }
+ if (ed != here) {
+ ed->ed_next = here;
+ if (here)
+ ed->hwNextED = *prev_p;
+ wmb();
+ *prev = ed;
+ *prev_p = cpu_to_hc32(ahcd, ed->dma);
+ wmb();
+ }
+ ahcd->load[i] += ed->load;
+ }
+ admhcd_to_hcd(ahcd)->self.bandwidth_allocated += ed->load / ed->interval;
+}
+#endif
+
+/* link an ed into the HC chain */
+
+static int ed_schedule(struct admhcd *ahcd, struct ed *ed)
+{
+ struct ed *old_tail;
+
+ if (admhcd_to_hcd(ahcd)->state == HC_STATE_QUIESCING)
+ return -EAGAIN;
+
+ ed->state = ED_OPER;
+
+ old_tail = ahcd->ed_tails[ed->type];
+
+ ed->ed_next = old_tail->ed_next;
+ if (ed->ed_next) {
+ ed->ed_next->ed_prev = ed;
+ ed->hwNextED = cpu_to_hc32(ahcd, ed->ed_next->dma);
+ }
+ ed->ed_prev = old_tail;
+
+ old_tail->ed_next = ed;
+ old_tail->hwNextED = cpu_to_hc32(ahcd, ed->dma);
+
+ ahcd->ed_tails[ed->type] = ed;
+
+ admhc_dma_enable(ahcd);
+
+ return 0;
+}
+
+/*-------------------------------------------------------------------------*/
+
+#if 0 /* FIXME */
+/* scan the periodic table to find and unlink this ED */
+static void periodic_unlink(struct admhcd *ahcd, struct ed *ed)
+{
+ int i;
+
+ for (i = ed->branch; i < NUM_INTS; i += ed->interval) {
+ struct ed *temp;
+ struct ed **prev = &ahcd->periodic[i];
+ __hc32 *prev_p = &ahcd->hcca->int_table[i];
+
+ while (*prev && (temp = *prev) != ed) {
+ prev_p = &temp->hwNextED;
+ prev = &temp->ed_next;
+ }
+ if (*prev) {
+ *prev_p = ed->hwNextED;
+ *prev = ed->ed_next;
+ }
+ ahcd->load[i] -= ed->load;
+ }
+
+ admhcd_to_hcd(ahcd)->self.bandwidth_allocated -= ed->load / ed->interval;
+ admhc_vdbg(ahcd, "unlink %sed %p branch %d [%dus.], interval %d\n",
+ (ed->hwINFO & cpu_to_hc32(ahcd, ED_ISO)) ? "iso " : "",
+ ed, ed->branch, ed->load, ed->interval);
+}
+#endif
+
+/* unlink an ed from the HC chain.
+ * just the link to the ed is unlinked.
+ * the link from the ed still points to another operational ed or 0
+ * so the HC can eventually finish the processing of the unlinked ed
+ * (assuming it already started that, which needn't be true).
+ *
+ * ED_UNLINK is a transient state: the HC may still see this ED, but soon
+ * it won't. ED_SKIP means the HC will finish its current transaction,
+ * but won't start anything new. The TD queue may still grow; device
+ * drivers don't know about this HCD-internal state.
+ *
+ * When the HC can't see the ED, something changes ED_UNLINK to one of:
+ *
+ * - ED_OPER: when there's any request queued, the ED gets rescheduled
+ * immediately. HC should be working on them.
+ *
+ * - ED_IDLE: when there's no TD queue. there's no reason for the HC
+ * to care about this ED; safe to disable the endpoint.
+ *
+ * When finish_unlinks() runs later, after SOF interrupt, it will often
+ * complete one or more URB unlinks before making that state change.
+ */
+static void ed_deschedule(struct admhcd *ahcd, struct ed *ed)
+{
+
+#ifdef ADMHC_VERBOSE_DEBUG
+ admhc_dump_ed(ahcd, "ED-DESCHED", ed, 1);
+#endif
+
+ ed->hwINFO |= cpu_to_hc32(ahcd, ED_SKIP);
+ wmb();
+ ed->state = ED_UNLINK;
+
+ /* remove this ED from the HC list */
+ ed->ed_prev->hwNextED = ed->hwNextED;
+
+ /* and remove it from our list also */
+ ed->ed_prev->ed_next = ed->ed_next;
+
+ if (ed->ed_next)
+ ed->ed_next->ed_prev = ed->ed_prev;
+
+ if (ahcd->ed_tails[ed->type] == ed)
+ ahcd->ed_tails[ed->type] = ed->ed_prev;
+}
+
+/*-------------------------------------------------------------------------*/
+
projects / openwrt.git / blobdiff