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Subject[PATCH 03/15] Introduce Cadence USBSSP DRD Driver - added gadget-ring.c file
Date
Signed-off-by: Laszczak Pawel <pawell@cadence.com>
---
drivers/usb/usbssp/gadget-ring.c | 3925 ++++++++++++++++++++++++++++++
1 file changed, 3925 insertions(+)
create mode 100644 drivers/usb/usbssp/gadget-ring.c

diff --git a/drivers/usb/usbssp/gadget-ring.c b/drivers/usb/usbssp/gadget-ring.c
new file mode 100644
index 000000000000..958ae27d88f2
--- /dev/null
+++ b/drivers/usb/usbssp/gadget-ring.c
@@ -0,0 +1,3925 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * USBSSP device controller driver
+ *
+ * Copyright (C) 2018 Cadence.
+ *
+ * Author: Pawel Laszczak
+ * Code borrowed from the Linux XHCI driver.
+ */
+
+/*
+ * Ring initialization rules:
+ * 1. Each segment is initialized to zero, except for link TRBs.
+ * 2. Ring cycle state = 0. This represents Producer Cycle State (PCS) or
+ * Consumer Cycle State (CCS), depending on ring function.
+ * 3. Enqueue pointer = dequeue pointer = address of first TRB in the segment.
+ *
+ * Ring behavior rules:
+ * 1. A ring is empty if enqueue == dequeue. This means there will always be at
+ * least one free TRB in the ring. This is useful if you want to turn that
+ * into a link TRB and expand the ring.
+ * 2. When incrementing an enqueue or dequeue pointer, if the next TRB is a
+ * link TRB, then load the pointer with the address in the link TRB. If the
+ * link TRB had its toggle bit set, you may need to update the ring cycle
+ * state (see cycle bit rules). You may have to do this multiple times
+ * until you reach a non-link TRB.
+ * 3. A ring is full if enqueue++ (for the definition of increment above)
+ * equals the dequeue pointer.
+ *
+ * Cycle bit rules:
+ * 1. When a consumer increments a dequeue pointer and encounters a toggle bit
+ * in a link TRB, it must toggle the ring cycle state.
+ * 2. When a producer increments an enqueue pointer and encounters a toggle bit
+ * in a link TRB, it must toggle the ring cycle state.
+ *
+ * Producer rules:
+ * 1. Check if ring is full before you enqueue.
+ * 2. Write the ring cycle state to the cycle bit in the TRB you're enqueuing.
+ * Update enqueue pointer between each write (which may update the ring
+ * cycle state).
+ * 3. Notify consumer. If SW is producer, it rings the doorbell for command
+ * and endpoint rings. If DC is the producer for the event ring,
+ * and it generates an interrupt according to interrupt modulation rules.
+ *
+ * Consumer rules:
+ * 1. Check if TRB belongs to you. If the cycle bit == your ring cycle state,
+ * the TRB is owned by the consumer.
+ * 2. Update dequeue pointer (which may update the ring cycle state) and
+ * continue processing TRBs until you reach a TRB which is not owned by you.
+ * 3. Notify the producer. SW is the consumer for the event ring, and it
+ * updates event ring dequeue pointer. DC is the consumer for the command and
+ * endpoint rings; it generates events on the event ring for these.
+ */
+
+#include <linux/scatterlist.h>
+#include <linux/slab.h>
+#include <linux/dma-mapping.h>
+#include "gadget-trace.h"
+#include "gadget.h"
+
+static void giveback_first_trb(struct usbssp_udc *usbssp_data,
+ unsigned int ep_index,
+ unsigned int stream_id,
+ int start_cycle,
+ struct usbssp_generic_trb
+ *start_trb);
+/*
+ * Returns zero if the TRB isn't in this segment, otherwise it returns the DMA
+ * address of the TRB.
+ */
+dma_addr_t usbssp_trb_virt_to_dma(struct usbssp_segment *seg,
+ union usbssp_trb *trb)
+{
+ unsigned long segment_offset;
+
+ if (!seg || !trb || trb < seg->trbs)
+ return 0;
+ /* offset in TRBs */
+ segment_offset = trb - seg->trbs;
+ if (segment_offset >= TRBS_PER_SEGMENT)
+ return 0;
+ return seg->dma + (segment_offset * sizeof(*trb));
+}
+
+static bool trb_is_noop(union usbssp_trb *trb)
+{
+ return TRB_TYPE_NOOP_LE32(trb->generic.field[3]);
+}
+
+static bool trb_is_link(union usbssp_trb *trb)
+{
+ return TRB_TYPE_LINK_LE32(trb->link.control);
+}
+
+static bool last_trb_on_seg(struct usbssp_segment *seg, union usbssp_trb *trb)
+{
+ return trb == &seg->trbs[TRBS_PER_SEGMENT - 1];
+}
+
+static bool last_trb_on_ring(struct usbssp_ring *ring,
+ struct usbssp_segment *seg,
+ union usbssp_trb *trb)
+{
+ return last_trb_on_seg(seg, trb) && (seg->next == ring->first_seg);
+}
+
+static bool link_trb_toggles_cycle(union usbssp_trb *trb)
+{
+ return le32_to_cpu(trb->link.control) & LINK_TOGGLE;
+}
+
+static bool last_td_in_request(struct usbssp_td *td)
+{
+ struct usbssp_request *req_priv = td->priv_request;
+
+ return req_priv->num_tds_done == req_priv->num_tds;
+}
+
+static void inc_td_cnt(struct usbssp_request *priv_req)
+{
+ priv_req->num_tds_done++;
+}
+
+static void trb_to_noop(union usbssp_trb *trb, u32 noop_type)
+{
+ if (trb_is_link(trb)) {
+ /* unchain chained link TRBs */
+ trb->link.control &= cpu_to_le32(~TRB_CHAIN);
+ } else {
+ trb->generic.field[0] = 0;
+ trb->generic.field[1] = 0;
+ trb->generic.field[2] = 0;
+ /* Preserve only the cycle bit of this TRB */
+ trb->generic.field[3] &= cpu_to_le32(TRB_CYCLE);
+ trb->generic.field[3] |= cpu_to_le32(TRB_TYPE(noop_type));
+ }
+}
+
+/* Updates trb to point to the next TRB in the ring, and updates seg if the next
+ * TRB is in a new segment. This does not skip over link TRBs, and it does not
+ * effect the ring dequeue or enqueue pointers.
+ */
+static void next_trb(struct usbssp_udc *usbssp_data,
+ struct usbssp_ring *ring,
+ struct usbssp_segment **seg,
+ union usbssp_trb **trb)
+{
+ if (trb_is_link(*trb)) {
+ *seg = (*seg)->next;
+ *trb = ((*seg)->trbs);
+ } else {
+ (*trb)++;
+ }
+}
+
+/*
+ * See Cycle bit rules. SW is the consumer for the event ring only.
+ * Don't make a ring full of link TRBs. That would be dumb and this would loop.
+ */
+void inc_deq(struct usbssp_udc *usbssp_data, struct usbssp_ring *ring)
+{
+ /* event ring doesn't have link trbs, check for last trb */
+ if (ring->type == TYPE_EVENT) {
+ if (!last_trb_on_seg(ring->deq_seg, ring->dequeue)) {
+ ring->dequeue++;
+ goto out;
+ }
+ if (last_trb_on_ring(ring, ring->deq_seg, ring->dequeue))
+ ring->cycle_state ^= 1;
+ ring->deq_seg = ring->deq_seg->next;
+ ring->dequeue = ring->deq_seg->trbs;
+ goto out;
+ }
+
+ /* All other rings have link trbs */
+ if (!trb_is_link(ring->dequeue)) {
+ ring->dequeue++;
+ ring->num_trbs_free++;
+ }
+ while (trb_is_link(ring->dequeue)) {
+ ring->deq_seg = ring->deq_seg->next;
+ ring->dequeue = ring->deq_seg->trbs;
+ }
+out:
+ trace_usbssp_inc_deq(ring);
+}
+
+/*
+ * See Cycle bit rules. SW is the consumer for the event ring only.
+ * Don't make a ring full of link TRBs. That would be dumb and this would loop.
+ *
+ * If we've just enqueued a TRB that is in the middle of a TD (meaning the
+ * chain bit is set), then set the chain bit in all the following link TRBs.
+ * If we've enqueued the last TRB in a TD, make sure the following link TRBs
+ * have their chain bit cleared (so that each Link TRB is a separate TD).
+ *
+ * @more_trbs_coming: Will you enqueue more TRBs before calling
+ * prepare_transfer()?
+ */
+static void inc_enq(struct usbssp_udc *usbssp_data,
+ struct usbssp_ring *ring,
+ bool more_trbs_coming)
+{
+ u32 chain;
+ union usbssp_trb *next;
+
+ chain = le32_to_cpu(ring->enqueue->generic.field[3]) & TRB_CHAIN;
+ /* If this is not event ring, there is one less usable TRB */
+ if (!trb_is_link(ring->enqueue))
+ ring->num_trbs_free--;
+ next = ++(ring->enqueue);
+
+ /* Update the dequeue pointer further if that was a link TRB */
+ while (trb_is_link(next)) {
+
+ /*
+ * If the caller doesn't plan on enqueueing more TDs before
+ * ringing the doorbell, then we don't want to give the link TRB
+ * to the hardware just yet. We'll give the link TRB back in
+ * prepare_ring() just before we enqueue the TD at the top of
+ * the ring.
+ */
+ if (!chain && !more_trbs_coming)
+ break;
+
+ next->link.control &= cpu_to_le32(~TRB_CHAIN);
+ next->link.control |= cpu_to_le32(chain);
+
+ /* Give this link TRB to the hardware */
+ wmb();
+ next->link.control ^= cpu_to_le32(TRB_CYCLE);
+
+ /* Toggle the cycle bit after the last ring segment. */
+ if (link_trb_toggles_cycle(next))
+ ring->cycle_state ^= 1;
+
+ ring->enq_seg = ring->enq_seg->next;
+ ring->enqueue = ring->enq_seg->trbs;
+ next = ring->enqueue;
+ }
+ trace_usbssp_inc_enq(ring);
+}
+
+/*
+ * Check to see if there's room to enqueue num_trbs on the ring and make sure
+ * enqueue pointer will not advance into dequeue segment. See rules above.
+ */
+static inline int room_on_ring(struct usbssp_udc *usbssp_data,
+ struct usbssp_ring *ring,
+ unsigned int num_trbs)
+{
+ int num_trbs_in_deq_seg;
+
+ if (ring->num_trbs_free < num_trbs)
+ return 0;
+
+ if (ring->type != TYPE_COMMAND && ring->type != TYPE_EVENT) {
+ num_trbs_in_deq_seg = ring->dequeue - ring->deq_seg->trbs;
+
+ if (ring->num_trbs_free < num_trbs + num_trbs_in_deq_seg)
+ return 0;
+ }
+
+ return 1;
+}
+
+/* Ring the device controller doorbell after placing a command on the ring */
+void usbssp_ring_cmd_db(struct usbssp_udc *usbssp_data)
+{
+ if (!(usbssp_data->cmd_ring_state & CMD_RING_STATE_RUNNING))
+ return;
+
+ usbssp_dbg(usbssp_data, "// Ding dong command ring!\n");
+ writel(DB_VALUE_CMD, &usbssp_data->dba->doorbell[0]);
+ /* Flush PCI posted writes */
+ readl(&usbssp_data->dba->doorbell[0]);
+}
+
+static bool usbssp_mod_cmd_timer(struct usbssp_udc *usbssp_data,
+ unsigned long delay)
+{
+ return mod_delayed_work(system_wq, &usbssp_data->cmd_timer, delay);
+ return 0;
+}
+
+static struct usbssp_command *usbssp_next_queued_cmd(
+ struct usbssp_udc *usbssp_data)
+{
+ return list_first_entry_or_null(&usbssp_data->cmd_list,
+ struct usbssp_command,
+ cmd_list);
+}
+
+/*
+ * Turn all commands on command ring with status set to "aborted" to no-op trbs.
+ * If there are other commands waiting then restart the ring and kick the timer.
+ * This must be called with command ring stopped and usbssp_data->lock held.
+ */
+static void usbssp_handle_stopped_cmd_ring(struct usbssp_udc *usbssp_data,
+ struct usbssp_command *cur_cmd)
+{
+ struct usbssp_command *i_cmd;
+
+ /* Turn all aborted commands in list to no-ops, then restart */
+ list_for_each_entry(i_cmd, &usbssp_data->cmd_list, cmd_list) {
+
+ if (i_cmd->status != COMP_COMMAND_ABORTED)
+ continue;
+
+ i_cmd->status = COMP_COMMAND_RING_STOPPED;
+
+ usbssp_dbg(usbssp_data, "Turn aborted command %p to no-op\n",
+ i_cmd->command_trb);
+
+ trb_to_noop(i_cmd->command_trb, TRB_CMD_NOOP);
+
+ /*
+ * caller waiting for completion is called when command
+ * completion event is received for these no-op commands
+ */
+ }
+
+ usbssp_data->cmd_ring_state = CMD_RING_STATE_RUNNING;
+
+ /* ring command ring doorbell to restart the command ring */
+ if ((usbssp_data->cmd_ring->dequeue != usbssp_data->cmd_ring->enqueue) &&
+ !(usbssp_data->usbssp_state & USBSSP_STATE_DYING)) {
+ usbssp_data->current_cmd = cur_cmd;
+ usbssp_mod_cmd_timer(usbssp_data, USBSSP_CMD_DEFAULT_TIMEOUT);
+ usbssp_ring_cmd_db(usbssp_data);
+ }
+}
+
+/* Must be called with usbssp_data->lock held, releases and aquires lock back */
+static int usbssp_abort_cmd_ring(struct usbssp_udc *usbssp_data,
+ unsigned long flags)
+{
+ u64 temp_64;
+ int ret;
+
+ usbssp_dbg(usbssp_data, "Abort command ring\n");
+ reinit_completion(&usbssp_data->cmd_ring_stop_completion);
+
+ temp_64 = usbssp_read_64(usbssp_data, &usbssp_data->op_regs->cmd_ring);
+ usbssp_write_64(usbssp_data, temp_64 | CMD_RING_ABORT,
+ &usbssp_data->op_regs->cmd_ring);
+
+ /* Spec says software should also time the
+ * completion of the Command Abort operation. If CRR is not negated in 5
+ * seconds then driver handles it as if device died (-ENODEV).
+ */
+ ret = usbssp_handshake(&usbssp_data->op_regs->cmd_ring,
+ CMD_RING_RUNNING, 0, 5 * 1000 * 1000);
+
+ if (ret < 0) {
+ usbssp_err(usbssp_data,
+ "Abort failed to stop command ring: %d\n", ret);
+ usbssp_halt(usbssp_data);
+ usbssp_udc_died(usbssp_data);
+ return ret;
+ }
+
+ /*
+ * Writing the CMD_RING_ABORT bit should cause a cmd completion event,
+ * Wait 2 secs (arbitrary number).
+ */
+ spin_unlock_irqrestore(&usbssp_data->lock, flags);
+ ret = wait_for_completion_timeout(
+ &usbssp_data->cmd_ring_stop_completion,
+ msecs_to_jiffies(2000));
+ spin_lock_irqsave(&usbssp_data->lock, flags);
+ if (!ret) {
+ usbssp_dbg(usbssp_data,
+ "No stop event for abort, ring start fail?\n");
+ usbssp_cleanup_command_queue(usbssp_data);
+ } else {
+ usbssp_handle_stopped_cmd_ring(usbssp_data,
+ usbssp_next_queued_cmd(usbssp_data));
+ }
+ return 0;
+}
+
+void usbssp_ring_ep_doorbell(struct usbssp_udc *usbssp_data,
+ unsigned int ep_index,
+ unsigned int stream_id)
+{
+ __le32 __iomem *db_addr =
+ &usbssp_data->dba->doorbell[usbssp_data->slot_id];
+ struct usbssp_ep *ep = &usbssp_data->devs.eps[ep_index];
+ unsigned int ep_state = ep->ep_state;
+ unsigned int db_value;
+ /* Don't ring the doorbell for this endpoint if there are pending
+ * cancellations because we don't want to interrupt processing.
+ * We don't want to restart any stream rings if there's a set dequeue
+ * pointer command pending because the device can choose to start any
+ * stream once the endpoint is on the HW schedule.
+ * Also we don't want restart any endpoint if endpoint is halted or
+ * disabled and also if endpoint disabling is pending.
+ */
+ if ((ep_state & EP_STOP_CMD_PENDING) ||
+ (ep_state & SET_DEQ_PENDING) ||
+ (ep_state & EP_HALTED) ||
+ !(ep_state & USBSSP_EP_ENABLED) ||
+ (ep_state & USBSSP_EP_DISABLE_PENDING))
+ return;
+
+ if (ep_index == 0 && !usbssp_data->ep0_expect_in &&
+ usbssp_data->ep0state == USBSSP_EP0_DATA_PHASE)
+ db_value = DB_VALUE_EP0_OUT(ep_index, stream_id);
+ else
+ db_value = DB_VALUE(ep_index, stream_id);
+
+ usbssp_dbg(usbssp_data, "// Ding dong transfer ring for %s!"
+ " - [DB addr/DB val]: [%p/%08x]\n",
+ usbssp_data->devs.eps[ep_index].name, db_addr,
+ db_value);
+
+ writel(db_value, db_addr);
+ /* The CPU has better things to do at this point than wait for a
+ * write-posting flush. It'll get there soon enough.
+ */
+}
+
+/* Ring the doorbell for any rings with pending USB requests */
+static void ring_doorbell_for_active_rings(struct usbssp_udc *usbssp_data,
+ unsigned int ep_index)
+{
+ unsigned int stream_id;
+ struct usbssp_ep *ep;
+
+ ep = &usbssp_data->devs.eps[ep_index];
+
+ usbssp_dbg(usbssp_data, "Ring all active ring for %s\n",
+ ep->name);
+
+ /* A ring has pending Request if its TD list is not empty */
+ if (!(ep->ep_state & EP_HAS_STREAMS)) {
+ if (ep->ring && !(list_empty(&ep->ring->td_list)))
+ usbssp_ring_ep_doorbell(usbssp_data, ep_index, 0);
+ return;
+ }
+
+ for (stream_id = 1; stream_id < ep->stream_info->num_streams;
+ stream_id++) {
+ struct usbssp_stream_info *stream_info = ep->stream_info;
+
+ if (!list_empty(&stream_info->stream_rings[stream_id]->td_list))
+ usbssp_ring_ep_doorbell(usbssp_data, ep_index,
+ stream_id);
+ }
+}
+
+/* Get the right ring for the given ep_index and stream_id.
+ * If the endpoint supports streams, boundary check the USB request's stream ID.
+ * If the endpoint doesn't support streams, return the singular endpoint ring.
+ */
+struct usbssp_ring *usbssp_triad_to_transfer_ring(
+ struct usbssp_udc *usbssp_data,
+ unsigned int ep_index,
+ unsigned int stream_id)
+{
+ struct usbssp_ep *ep;
+
+ ep = &usbssp_data->devs.eps[ep_index];
+
+ /* Common case: no streams */
+ if (!(ep->ep_state & EP_HAS_STREAMS))
+ return ep->ring;
+
+ if (stream_id == 0) {
+ usbssp_warn(usbssp_data,
+ "WARN: ep index %u has streams, "
+ "but USB Request has no stream ID.\n",
+ ep_index);
+ return NULL;
+ }
+
+ if (stream_id < ep->stream_info->num_streams)
+ return ep->stream_info->stream_rings[stream_id];
+
+ usbssp_warn(usbssp_data,
+ "WARN: ep index %u has "
+ "stream IDs 1 to %u allocated, "
+ "but stream ID %u is requested.\n",
+ ep_index,
+ ep->stream_info->num_streams - 1,
+ stream_id);
+ return NULL;
+}
+
+
+/*
+ * Get the hw dequeue pointer DC stopped on, either directly from the
+ * endpoint context, or if streams are in use from the stream context.
+ * The returned hw_dequeue contains the lowest four bits with cycle state
+ * and possbile stream context type.
+ */
+/*static*/ u64 usbssp_get_hw_deq(struct usbssp_udc *usbssp_data,
+ struct usbssp_device *dev,
+ unsigned int ep_index,
+ unsigned int stream_id)
+{
+ struct usbssp_ep_ctx *ep_ctx;
+ struct usbssp_stream_ctx *st_ctx;
+ struct usbssp_ep *ep;
+
+ ep = &dev->eps[ep_index];
+
+ if (ep->ep_state & EP_HAS_STREAMS) {
+ st_ctx = &ep->stream_info->stream_ctx_array[stream_id];
+ return le64_to_cpu(st_ctx->stream_ring);
+ }
+ ep_ctx = usbssp_get_ep_ctx(usbssp_data, dev->out_ctx, ep_index);
+ return le64_to_cpu(ep_ctx->deq);
+}
+
+/*
+ * Move the DC endpoint ring dequeue pointer past cur_td.
+ * Record the new state of the DC endpoint ring dequeue segment,
+ * dequeue pointer, and new consumer cycle state in state.
+ * Update our internal representation of the ring's dequeue pointer.
+ *
+ * We do this in three jumps:
+ * - First we update our new ring state to be the same as when the DC stopped.
+ * - Then we traverse the ring to find the segment that contains
+ * the last TRB in the TD. We toggle the DC new cycle state when we pass
+ * any link TRBs with the toggle cycle bit set.
+ * - Finally we move the dequeue state one TRB further, toggling the cycle bit
+ * if we've moved it past a link TRB with the toggle cycle bit set.
+ */
+void usbssp_find_new_dequeue_state(struct usbssp_udc *usbssp_data,
+ unsigned int ep_index,
+ unsigned int stream_id,
+ struct usbssp_td *cur_td,
+ struct usbssp_dequeue_state *state)
+{
+ struct usbssp_device *dev_priv = &usbssp_data->devs;
+ struct usbssp_ep *ep_priv = &dev_priv->eps[ep_index];
+ struct usbssp_ring *ep_ring;
+ struct usbssp_segment *new_seg;
+ union usbssp_trb *new_deq;
+ dma_addr_t addr;
+ u64 hw_dequeue;
+ bool cycle_found = false;
+ bool td_last_trb_found = false;
+
+ ep_ring = usbssp_triad_to_transfer_ring(usbssp_data,
+ ep_index, stream_id);
+ if (!ep_ring) {
+ usbssp_warn(usbssp_data, "WARN can't find new dequeue state "
+ "for invalid stream ID %u.\n",
+ stream_id);
+ return;
+ }
+
+ /* Dig out the cycle state saved by the DC during the stop ep cmd */
+ usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_cancel_request,
+ "Finding endpoint context");
+
+ hw_dequeue = usbssp_get_hw_deq(usbssp_data, dev_priv,
+ ep_index, stream_id);
+ new_seg = ep_ring->deq_seg;
+ new_deq = ep_ring->dequeue;
+ state->new_cycle_state = hw_dequeue & 0x1;
+ state->stream_id = stream_id;
+
+ /*
+ * We want to find the pointer, segment and cycle state of the new trb
+ * (the one after current TD's last_trb). We know the cycle state at
+ * hw_dequeue, so walk the ring until both hw_dequeue and last_trb are
+ * found.
+ */
+ do {
+ if (!cycle_found && usbssp_trb_virt_to_dma(new_seg, new_deq)
+ == (dma_addr_t)(hw_dequeue & ~0xf)) {
+ cycle_found = true;
+ if (td_last_trb_found)
+ break;
+ }
+
+ if (new_deq == cur_td->last_trb)
+ td_last_trb_found = true;
+
+ if (cycle_found && trb_is_link(new_deq) &&
+ link_trb_toggles_cycle(new_deq))
+ state->new_cycle_state ^= 0x1;
+
+ next_trb(usbssp_data, ep_ring, &new_seg, &new_deq);
+
+ /* Search wrapped around, bail out */
+ if (new_deq == ep_priv->ring->dequeue) {
+ usbssp_err(usbssp_data,
+ "Error: Failed finding new dequeue state\n");
+ state->new_deq_seg = NULL;
+ state->new_deq_ptr = NULL;
+ return;
+ }
+
+ } while (!cycle_found || !td_last_trb_found);
+
+ state->new_deq_seg = new_seg;
+ state->new_deq_ptr = new_deq;
+
+ /* Don't update the ring cycle state for the producer (us). */
+ usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_cancel_request,
+ "Cycle state = 0x%x", state->new_cycle_state);
+
+ usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_cancel_request,
+ "New dequeue segment = %p (virtual)",
+ state->new_deq_seg);
+ addr = usbssp_trb_virt_to_dma(state->new_deq_seg, state->new_deq_ptr);
+ usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_cancel_request,
+ "New dequeue pointer = 0x%llx (DMA)",
+ (unsigned long long) addr);
+}
+
+/* flip_cycle means flip the cycle bit of all but the first and last TRB.
+ * (The last TRB actually points to the ring enqueue pointer, which is not part
+ * of this TD.) This is used to remove partially enqueued isoc TDs from a ring.
+ */
+static void td_to_noop(struct usbssp_udc *usbssp_data,
+ struct usbssp_ring *ep_ring,
+ struct usbssp_td *td, bool flip_cycle)
+{
+ struct usbssp_segment *seg = td->start_seg;
+ union usbssp_trb *trb = td->first_trb;
+
+ while (1) {
+ trb_to_noop(trb, TRB_TR_NOOP);
+
+ /* flip cycle if asked to */
+ if (flip_cycle && trb != td->first_trb && trb != td->last_trb)
+ trb->generic.field[3] ^= cpu_to_le32(TRB_CYCLE);
+
+ if (trb == td->last_trb)
+ break;
+
+ next_trb(usbssp_data, ep_ring, &seg, &trb);
+ }
+}
+
+/* Must be called with usbssp_data->lock held in interrupt context
+ * or usbssp_data->irq_thread_lock from thread conext (defered interrupt)
+ */
+void usbssp_giveback_request_in_irq(struct usbssp_udc *usbssp_data,
+ struct usbssp_td *cur_td,
+ int status)
+{
+ struct usb_request *req;
+ struct usbssp_request *req_priv;
+
+ req_priv = cur_td->priv_request;
+ req = &req_priv->request;
+
+ usbssp_request_free_priv(req_priv);
+
+ usbssp_gadget_giveback(req_priv->dep, req_priv, status);
+}
+
+void usbssp_unmap_td_bounce_buffer(struct usbssp_udc *usbssp_data,
+ struct usbssp_ring *ring,
+ struct usbssp_td *td)
+{
+ /*TODO: ??? */
+}
+
+void usbssp_remove_request(struct usbssp_udc *usbssp_data,
+ struct usbssp_request *req_priv, int ep_index)
+{
+ int i = 0;
+ struct usbssp_ring *ep_ring;
+ struct usbssp_ep *ep;
+ struct usbssp_td *cur_td = NULL;
+ struct usbssp_ep_ctx *ep_ctx;
+ struct usbssp_device *priv_dev;
+ u64 hw_deq;
+ struct usbssp_dequeue_state deq_state;
+
+ memset(&deq_state, 0, sizeof(deq_state));
+ ep = &usbssp_data->devs.eps[ep_index];
+
+ priv_dev = &usbssp_data->devs;
+ ep_ctx = usbssp_get_ep_ctx(usbssp_data, priv_dev->out_ctx, ep_index);
+ trace_usbssp_remove_request(ep_ctx);
+ /*
+ * We have the DC lock and disabled interrupt, so nothing can modify
+ * this list until we drop it.
+ */
+
+ i = req_priv->num_tds_done;
+
+ for (; i < req_priv->num_tds; i++) {
+ cur_td = &req_priv->td[i];
+ usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_cancel_request,
+ "Removing canceled TD starting at 0x%llx (dma).",
+ (unsigned long long)usbssp_trb_virt_to_dma(
+ cur_td->start_seg, cur_td->first_trb));
+
+ ep_ring = usbssp_request_to_transfer_ring(usbssp_data,
+ cur_td->priv_request);
+
+ if (!ep_ring) {
+ /* This shouldn't happen unless a driver is mucking
+ * with the stream ID after submission. This will
+ * leave the TD on the hardware ring, and the hardware
+ * will try to execute it, and may access a buffer
+ * that has already been freed. In the best case, the
+ * hardware will execute it, and the event handler will
+ * ignore the completion event for that TD, since it was
+ * removed from the td_list for that endpoint. In
+ * short, don't muck with the stream ID after
+ * submission.
+ */
+ usbssp_warn(usbssp_data, "WARN Cancelled USB Request %p"
+ " has invalid stream ID %u.\n",
+ cur_td->priv_request,
+ cur_td->priv_request->request.stream_id);
+ goto remove_finished_td;
+ }
+
+ if (!(ep->ep_state & USBSSP_EP_ENABLED) ||
+ ep->ep_state & USBSSP_EP_DISABLE_PENDING) {
+ goto remove_finished_td;
+ }
+
+ /*
+ * If we stopped on the TD we need to cancel, then we have to
+ * move the DC endpoint ring dequeue pointer past this TD.
+ */
+ hw_deq = usbssp_get_hw_deq(usbssp_data, priv_dev, ep_index,
+ cur_td->priv_request->request.stream_id);
+ hw_deq &= ~0xf;
+
+ if (usbssp_trb_in_td(usbssp_data, cur_td->start_seg,
+ cur_td->first_trb, cur_td->last_trb, hw_deq, false)) {
+ usbssp_find_new_dequeue_state(usbssp_data, ep_index,
+ cur_td->priv_request->request.stream_id,
+ cur_td, &deq_state);
+ } else {
+ td_to_noop(usbssp_data, ep_ring, cur_td, false);
+ }
+
+remove_finished_td:
+ /*
+ * The event handler won't see a completion for this TD anymore,
+ * so remove it from the endpoint ring's TD list.
+ */
+ list_del_init(&cur_td->td_list);
+ }
+
+ ep->ep_state &= ~EP_STOP_CMD_PENDING;
+
+ if (!(ep->ep_state & USBSSP_EP_DISABLE_PENDING) &&
+ ep->ep_state & USBSSP_EP_ENABLED) {
+ /* If necessary, queue a Set Transfer Ring Dequeue Pointer
+ * command
+ */
+ if (deq_state.new_deq_ptr && deq_state.new_deq_seg) {
+ usbssp_queue_new_dequeue_state(usbssp_data, ep_index,
+ &deq_state);
+ usbssp_ring_cmd_db(usbssp_data);
+ } else {
+ /* Otherwise ring the doorbell(s) to restart queued
+ * transfers
+ */
+ ring_doorbell_for_active_rings(usbssp_data, ep_index);
+ }
+ }
+
+ /*
+ * Complete the cancellation of USB request.
+ */
+ i = req_priv->num_tds_done;
+ for (; i < req_priv->num_tds; i++) {
+ cur_td = &req_priv->td[i];
+
+ /* Clean up the cancelled USB Request */
+ /* Doesn't matter what we pass for status, since the core will
+ * just overwrite it.
+ */
+ ep_ring = usbssp_request_to_transfer_ring(usbssp_data,
+ cur_td->priv_request);
+
+ usbssp_unmap_td_bounce_buffer(usbssp_data, ep_ring, cur_td);
+
+ inc_td_cnt(cur_td->priv_request);
+ if (last_td_in_request(cur_td)) {
+ usbssp_giveback_request_in_irq(usbssp_data,
+ cur_td, -ECONNRESET);
+ }
+ }
+}
+
+
+/*
+ * When we get a command completion for a Stop Endpoint Command, we need to
+ * stop timer and clear EP_STOP_CMD_PENDING flag.
+ */
+static void usbssp_handle_cmd_stop_ep(struct usbssp_udc *usbssp_data,
+ union usbssp_trb *trb,
+ struct usbssp_event_cmd *event)
+{
+ unsigned int ep_index;
+ struct usbssp_ep *ep;
+ struct usbssp_ep_ctx *ep_ctx;
+ struct usbssp_device *priv_dev;
+
+ ep_index = TRB_TO_EP_INDEX(le32_to_cpu(trb->generic.field[3]));
+ ep = &usbssp_data->devs.eps[ep_index];
+
+ usbssp_dbg(usbssp_data,
+ "CMD stop endpoint completion for ep index: %d - %s\n",
+ ep_index, ep->name);
+
+
+ priv_dev = &usbssp_data->devs;
+ ep_ctx = usbssp_get_ep_ctx(usbssp_data, priv_dev->out_ctx, ep_index);
+ trace_usbssp_handle_cmd_stop_ep(ep_ctx);
+
+ ep->ep_state &= ~EP_STOP_CMD_PENDING;
+}
+
+
+static void usbssp_kill_ring_requests(struct usbssp_udc *usbssp_data,
+ struct usbssp_ring *ring)
+{
+ struct usbssp_td *cur_td;
+ struct usbssp_td *tmp;
+
+ list_for_each_entry_safe(cur_td, tmp, &ring->td_list, td_list) {
+ list_del_init(&cur_td->td_list);
+
+ usbssp_unmap_td_bounce_buffer(usbssp_data, ring, cur_td);
+ inc_td_cnt(cur_td->priv_request);
+ }
+}
+
+void usbssp_kill_endpoint_request(struct usbssp_udc *usbssp_data,
+ int ep_index)
+{
+ struct usbssp_ep *ep;
+ struct usbssp_ring *ring;
+
+ ep = &usbssp_data->devs.eps[ep_index];
+ if ((ep->ep_state & EP_HAS_STREAMS) ||
+ (ep->ep_state & EP_GETTING_NO_STREAMS)) {
+ int stream_id;
+
+ for (stream_id = 0; stream_id < ep->stream_info->num_streams;
+ stream_id++) {
+
+ ring = ep->stream_info->stream_rings[stream_id];
+ if (!ring)
+ continue;
+
+ usbssp_dbg_trace(usbssp_data,
+ trace_usbssp_dbg_cancel_request,
+ "Killing Requests for slot ID %u,"
+ "ep index %u, stream %u",
+ usbssp_data->slot_id, ep_index, stream_id + 1);
+ usbssp_kill_ring_requests(usbssp_data, ring);
+ }
+ } else {
+ ring = ep->ring;
+ if (!ring)
+ return;
+
+ usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_cancel_request,
+ "Killing Requests for slot ID %u, ep index %u",
+ usbssp_data->slot_id, ep_index);
+ usbssp_kill_ring_requests(usbssp_data, ring);
+ }
+}
+
+/*
+ * USBSSP controller died, register read returns 0xffffffff
+ * Complete pending commands, mark them ABORTED.
+ * USB requests need to be given back as gadget core might be waiting with
+ * device lock held for the Requests to finish during device disconnect,
+ * blocking device remove.
+ *
+ */
+
+void usbssp_udc_died(struct usbssp_udc *usbssp_data)
+{
+ int i;
+
+ if (usbssp_data->usbssp_state & USBSSP_STATE_DYING)
+ return;
+
+ usbssp_err(usbssp_data,
+ "USBSSP controller not responding, assume dead\n");
+ usbssp_data->usbssp_state |= USBSSP_STATE_DYING;
+
+ usbssp_cleanup_command_queue(usbssp_data);
+
+ /* return any pending requests, remove may be waiting for them */
+ for (i = 0; i < 31; i++)
+ usbssp_kill_endpoint_request(usbssp_data, i);
+
+}
+
+static void update_ring_for_set_deq_completion(struct usbssp_udc *usbssp_data,
+ struct usbssp_device *dev,
+ struct usbssp_ring *ep_ring,
+ unsigned int ep_index)
+{
+ union usbssp_trb *dequeue_temp;
+ int num_trbs_free_temp;
+ bool revert = false;
+
+ num_trbs_free_temp = ep_ring->num_trbs_free;
+ dequeue_temp = ep_ring->dequeue;
+
+ if (trb_is_link(ep_ring->dequeue)) {
+ ep_ring->deq_seg = ep_ring->deq_seg->next;
+ ep_ring->dequeue = ep_ring->deq_seg->trbs;
+ }
+
+ while (ep_ring->dequeue != dev->eps[ep_index].queued_deq_ptr) {
+ /* We have more usable TRBs */
+ ep_ring->num_trbs_free++;
+ ep_ring->dequeue++;
+ if (trb_is_link(ep_ring->dequeue)) {
+ if (ep_ring->dequeue ==
+ dev->eps[ep_index].queued_deq_ptr)
+ break;
+ ep_ring->deq_seg = ep_ring->deq_seg->next;
+ ep_ring->dequeue = ep_ring->deq_seg->trbs;
+ }
+ if (ep_ring->dequeue == dequeue_temp) {
+ revert = true;
+ break;
+ }
+ }
+
+ if (revert) {
+ usbssp_dbg(usbssp_data, "Unable to find new dequeue pointer\n");
+ ep_ring->num_trbs_free = num_trbs_free_temp;
+ }
+}
+
+/*
+ * When we get a completion for a Set Transfer Ring Dequeue Pointer command,
+ * we need to clear the set deq pending flag in the endpoint ring state, so that
+ * the TD queueing code can ring the doorbell again. We also need to ring the
+ * endpoint doorbell to restart the ring
+ */
+static void usbssp_handle_cmd_set_deq(struct usbssp_udc *usbssp_data,
+ union usbssp_trb *trb, u32 cmd_comp_code)
+{
+ unsigned int ep_index;
+ unsigned int stream_id;
+ struct usbssp_ring *ep_ring;
+ struct usbssp_device *dev;
+ struct usbssp_ep *ep;
+ struct usbssp_ep_ctx *ep_ctx;
+ struct usbssp_slot_ctx *slot_ctx;
+
+ ep_index = TRB_TO_EP_INDEX(le32_to_cpu(trb->generic.field[3]));
+ stream_id = TRB_TO_STREAM_ID(le32_to_cpu(trb->generic.field[2]));
+ dev = &usbssp_data->devs;
+ ep = &dev->eps[ep_index];
+
+ ep_ring = usbssp_stream_id_to_ring(dev, ep_index, stream_id);
+ if (!ep_ring) {
+ usbssp_warn(usbssp_data,
+ "WARN Set TR deq ptr command for freed stream ID %u\n",
+ stream_id);
+ /* XXX: Harmless??? */
+ goto cleanup;
+ }
+
+ ep_ctx = usbssp_get_ep_ctx(usbssp_data, dev->out_ctx, ep_index);
+ slot_ctx = usbssp_get_slot_ctx(usbssp_data, dev->out_ctx);
+ trace_usbssp_handle_cmd_set_deq(slot_ctx);
+ trace_usbssp_handle_cmd_set_deq_ep(ep_ctx);
+
+ if (cmd_comp_code != COMP_SUCCESS) {
+ unsigned int ep_state;
+ unsigned int slot_state;
+
+ switch (cmd_comp_code) {
+ case COMP_TRB_ERROR:
+ usbssp_warn(usbssp_data,
+ "WARN Set TR Deq Ptr cmd invalid because of "
+ "stream ID configuration\n");
+ break;
+ case COMP_CONTEXT_STATE_ERROR:
+ usbssp_warn(usbssp_data, "WARN Set TR Deq Ptr cmd "
+ "failed due to incorrect slot or ep state.\n");
+ ep_state = GET_EP_CTX_STATE(ep_ctx);
+ slot_state = le32_to_cpu(slot_ctx->dev_state);
+ slot_state = GET_SLOT_STATE(slot_state);
+ usbssp_dbg_trace(usbssp_data,
+ trace_usbssp_dbg_cancel_request,
+ "Slot state = %u, EP state = %u",
+ slot_state, ep_state);
+ break;
+ case COMP_SLOT_NOT_ENABLED_ERROR:
+ usbssp_warn(usbssp_data,
+ "WARN Set TR Deq Ptr cmd failed because"
+ " slot %u was not enabled.\n",
+ usbssp_data->slot_id);
+ break;
+ default:
+ usbssp_warn(usbssp_data, "WARN Set TR Deq Ptr cmd with"
+ " unknown completion code of %u.\n",
+ cmd_comp_code);
+ break;
+ }
+
+ } else {
+ u64 deq;
+ /* deq ptr is written to the stream ctx for streams */
+ if (ep->ep_state & EP_HAS_STREAMS) {
+ struct usbssp_stream_ctx *ctx =
+ &ep->stream_info->stream_ctx_array[stream_id];
+ deq = le64_to_cpu(ctx->stream_ring) & SCTX_DEQ_MASK;
+ } else {
+ deq = le64_to_cpu(ep_ctx->deq) & ~EP_CTX_CYCLE_MASK;
+ }
+ usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_cancel_request,
+ "Successful Set TR Deq Ptr cmd, deq = @%08llx", deq);
+ if (usbssp_trb_virt_to_dma(ep->queued_deq_seg,
+ ep->queued_deq_ptr) == deq) {
+ /* Update the ring's dequeue segment and dequeue pointer
+ * to reflect the new position.
+ */
+ update_ring_for_set_deq_completion(usbssp_data, dev,
+ ep_ring, ep_index);
+ } else {
+ usbssp_warn(usbssp_data,
+ "Mismatch between completed Set TR Deq "
+ "Ptr command & DC internal state.\n");
+ usbssp_warn(usbssp_data,
+ "ep deq seg = %p, deq ptr = %p\n",
+ ep->queued_deq_seg, ep->queued_deq_ptr);
+ }
+ }
+
+cleanup:
+ dev->eps[ep_index].ep_state &= ~SET_DEQ_PENDING;
+ dev->eps[ep_index].queued_deq_seg = NULL;
+ dev->eps[ep_index].queued_deq_ptr = NULL;
+ /* Restart any rings with pending requests */
+ ring_doorbell_for_active_rings(usbssp_data, ep_index);
+}
+
+
+static void usbssp_handle_cmd_reset_ep(struct usbssp_udc *usbssp_data,
+ union usbssp_trb *trb,
+ u32 cmd_comp_code)
+{
+ struct usbssp_ep *dep;
+ struct usbssp_ep_ctx *ep_ctx;
+ unsigned int ep_index;
+
+ ep_index = TRB_TO_EP_INDEX(le32_to_cpu(trb->generic.field[3]));
+ ep_ctx = usbssp_get_ep_ctx(usbssp_data, usbssp_data->devs.out_ctx,
+ ep_index);
+ trace_usbssp_handle_cmd_reset_ep(ep_ctx);
+
+ /* This command will only fail if the endpoint wasn't halted,
+ * but we don't care.
+ */
+ usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_reset_ep,
+ "Ignoring reset ep completion code of %u", cmd_comp_code);
+
+ dep = &usbssp_data->devs.eps[ep_index];
+
+ /* Clear our internal halted state */
+ dep->ep_state &= ~EP_HALTED;
+
+ ring_doorbell_for_active_rings(usbssp_data, ep_index);
+}
+
+static void usbssp_handle_cmd_enable_slot(struct usbssp_udc *usbssp_data,
+ int slot_id,
+ struct usbssp_command *command,
+ u32 cmd_comp_code)
+{
+ if (cmd_comp_code == COMP_SUCCESS) {
+ usbssp_dbg(usbssp_data,
+ "CMD enable slot complition successfully "
+ "- slto id: %d\n", slot_id);
+ usbssp_data->slot_id = slot_id;
+ } else {
+ usbssp_dbg(usbssp_data, "CMD enable slot complition failed\n");
+ usbssp_data->slot_id = 0;
+ }
+}
+
+static void usbssp_handle_cmd_disable_slot(struct usbssp_udc *usbssp_data)
+{
+ struct usbssp_device *dev_priv;
+ struct usbssp_slot_ctx *slot_ctx;
+
+ usbssp_dbg(usbssp_data, "CMD disable slot complition\n");
+
+ dev_priv = &usbssp_data->devs;
+ if (!dev_priv)
+ return;
+
+ usbssp_data->slot_id = 0;
+ slot_ctx = usbssp_get_slot_ctx(usbssp_data, dev_priv->out_ctx);
+ trace_usbssp_handle_cmd_disable_slot(slot_ctx);
+}
+
+static void usbssp_handle_cmd_config_ep(struct usbssp_udc *usbssp_data,
+ struct usbssp_event_cmd *event, u32 cmd_comp_code)
+{
+ struct usbssp_device *priv_dev;
+ struct usbssp_input_control_ctx *ctrl_ctx;
+ struct usbssp_ep_ctx *ep_ctx;
+ unsigned int ep_index;
+ u32 add_flags, drop_flags;
+
+ /*
+ * Configure endpoint commands can come, becaouse device
+ * receive USB_SET_CONFIGURATION or SET_INTERFACE request,
+ * or because the HW needed an extra configure endpoint
+ * command after a reset or disconnect event.
+ */
+ priv_dev = &usbssp_data->devs;
+ ctrl_ctx = usbssp_get_input_control_ctx(priv_dev->in_ctx);
+ if (!ctrl_ctx) {
+ usbssp_warn(usbssp_data,
+ "Could not get input context, bad type.\n");
+ return;
+ }
+
+ add_flags = le32_to_cpu(ctrl_ctx->add_flags);
+ drop_flags = le32_to_cpu(ctrl_ctx->drop_flags);
+ /* Input ctx add_flags are the endpoint index plus one */
+ ep_index = usbssp_last_valid_endpoint(add_flags) - 1;
+
+ ep_ctx = usbssp_get_ep_ctx(usbssp_data, priv_dev->out_ctx, ep_index);
+ trace_usbssp_handle_cmd_config_ep(ep_ctx);
+}
+
+static void usbssp_handle_cmd_reset_dev(struct usbssp_udc *usbssp_data,
+ struct usbssp_event_cmd *event)
+{
+ struct usbssp_device *dev_priv;
+ struct usbssp_slot_ctx *slot_ctx;
+
+ dev_priv = &usbssp_data->devs;
+ slot_ctx = usbssp_get_slot_ctx(usbssp_data, dev_priv->out_ctx);
+ trace_usbssp_handle_cmd_reset_dev(slot_ctx);
+ usbssp_dbg(usbssp_data, "Completed reset device command.\n");
+ if (!usbssp_data->devs.gadget)
+ usbssp_warn(usbssp_data, "Reset device command completion\n");
+}
+
+static void usbssp_complete_del_and_free_cmd(struct usbssp_command *cmd,
+ u32 status)
+{
+ list_del(&cmd->cmd_list);
+
+ if (cmd->completion) {
+ cmd->status = status;
+ complete(cmd->completion);
+ } else {
+ kfree(cmd);
+ }
+}
+
+void usbssp_cleanup_command_queue(struct usbssp_udc *usbssp_data)
+{
+ struct usbssp_command *cur_cmd, *tmp_cmd;
+
+ list_for_each_entry_safe(cur_cmd, tmp_cmd, &usbssp_data->cmd_list, cmd_list)
+ usbssp_complete_del_and_free_cmd(cur_cmd, COMP_COMMAND_ABORTED);
+}
+
+void usbssp_handle_command_timeout(struct work_struct *work)
+{
+ struct usbssp_udc *usbssp_data;
+ unsigned long flags;
+ u64 hw_ring_state;
+
+ usbssp_data = container_of(to_delayed_work(work), struct usbssp_udc,
+ cmd_timer);
+
+ spin_lock_irqsave(&usbssp_data->lock, flags);
+
+ /*
+ * If timeout work is pending, or current_cmd is NULL, it means we
+ * raced with command completion. Command is handled so just return.
+ */
+ if (!usbssp_data->current_cmd ||
+ delayed_work_pending(&usbssp_data->cmd_timer)) {
+ spin_unlock_irqrestore(&usbssp_data->lock, flags);
+ return;
+ }
+ /* mark this command to be cancelled */
+ usbssp_data->current_cmd->status = COMP_COMMAND_ABORTED;
+
+ /* Make sure command ring is running before aborting it */
+ hw_ring_state = usbssp_read_64(usbssp_data,
+ &usbssp_data->op_regs->cmd_ring);
+ if (hw_ring_state == ~(u64)0) {
+ usbssp_udc_died(usbssp_data);
+ goto time_out_completed;
+ }
+
+ if ((usbssp_data->cmd_ring_state & CMD_RING_STATE_RUNNING) &&
+ (hw_ring_state & CMD_RING_RUNNING)) {
+ /* Prevent new doorbell, and start command abort */
+ usbssp_data->cmd_ring_state = CMD_RING_STATE_ABORTED;
+ usbssp_dbg(usbssp_data, "Command timeout\n");
+ usbssp_abort_cmd_ring(usbssp_data, flags);
+ goto time_out_completed;
+ }
+
+ /* device disconnected. Bail out */
+ if (usbssp_data->usbssp_state & USBSSP_STATE_REMOVING) {
+ usbssp_dbg(usbssp_data, "device removed, ring start fail?\n");
+ usbssp_cleanup_command_queue(usbssp_data);
+ goto time_out_completed;
+ }
+
+ /* command timeout on stopped ring, ring can't be aborted */
+ usbssp_dbg(usbssp_data, "Command timeout on stopped ring\n");
+ usbssp_handle_stopped_cmd_ring(usbssp_data, usbssp_data->current_cmd);
+
+time_out_completed:
+ spin_unlock_irqrestore(&usbssp_data->lock, flags);
+}
+
+static void handle_cmd_completion(struct usbssp_udc *usbssp_data,
+ struct usbssp_event_cmd *event)
+{
+ int slot_id = TRB_TO_SLOT_ID(le32_to_cpu(event->flags));
+ u64 cmd_dma;
+ dma_addr_t cmd_dequeue_dma;
+ u32 cmd_comp_code;
+ union usbssp_trb *cmd_trb;
+ struct usbssp_command *cmd;
+ u32 cmd_type;
+
+ cmd_dma = le64_to_cpu(event->cmd_trb);
+ cmd_trb = usbssp_data->cmd_ring->dequeue;
+
+ trace_usbssp_handle_command(usbssp_data->cmd_ring, &cmd_trb->generic);
+
+ cmd_dequeue_dma = usbssp_trb_virt_to_dma(usbssp_data->cmd_ring->deq_seg,
+ cmd_trb);
+
+ /*
+ * Check whether the completion event is for our internal kept
+ * command.
+ */
+ if (!cmd_dequeue_dma || cmd_dma != (u64)cmd_dequeue_dma) {
+ usbssp_warn(usbssp_data,
+ "ERROR mismatched command completion event\n");
+ return;
+ }
+
+ cmd = list_entry(usbssp_data->cmd_list.next, struct usbssp_command,
+ cmd_list);
+
+ cancel_delayed_work(&usbssp_data->cmd_timer);
+
+ cmd_comp_code = GET_COMP_CODE(le32_to_cpu(event->status));
+
+ /* If CMD ring stopped we own the trbs between enqueue and dequeue */
+ if (cmd_comp_code == COMP_COMMAND_RING_STOPPED) {
+ complete_all(&usbssp_data->cmd_ring_stop_completion);
+ return;
+ }
+
+ if (cmd->command_trb != usbssp_data->cmd_ring->dequeue) {
+ usbssp_err(usbssp_data,
+ "Command completion event does not match command\n");
+ return;
+ }
+
+ /*
+ * device aborted the command ring, check if the current command was
+ * supposed to be aborted, otherwise continue normally.
+ * The command ring is stopped now, but the DC will issue a Command
+ * Ring Stopped event which will cause us to restart it.
+ */
+ if (cmd_comp_code == COMP_COMMAND_ABORTED) {
+ usbssp_data->cmd_ring_state = CMD_RING_STATE_STOPPED;
+
+ if (cmd->status == COMP_COMMAND_ABORTED) {
+ if (usbssp_data->current_cmd == cmd)
+ usbssp_data->current_cmd = NULL;
+ goto event_handled;
+ }
+ }
+
+ cmd_type = TRB_FIELD_TO_TYPE(le32_to_cpu(cmd_trb->generic.field[3]));
+ switch (cmd_type) {
+ case TRB_ENABLE_SLOT:
+ usbssp_handle_cmd_enable_slot(usbssp_data, slot_id,
+ cmd, cmd_comp_code);
+ break;
+ case TRB_DISABLE_SLOT:
+ usbssp_handle_cmd_disable_slot(usbssp_data);
+ break;
+ case TRB_CONFIG_EP:
+ if (!cmd->completion)
+ usbssp_handle_cmd_config_ep(usbssp_data, event,
+ cmd_comp_code);
+ break;
+ case TRB_EVAL_CONTEXT:
+ break;
+ case TRB_ADDR_DEV: {
+ struct usbssp_slot_ctx *slot_ctx;
+
+ slot_ctx = usbssp_get_slot_ctx(usbssp_data,
+ usbssp_data->devs.out_ctx);
+ trace_usbssp_handle_cmd_addr_dev(slot_ctx);
+ break;
+ }
+ case TRB_STOP_RING:
+ WARN_ON(slot_id != TRB_TO_SLOT_ID(
+ le32_to_cpu(cmd_trb->generic.field[3])));
+ usbssp_handle_cmd_stop_ep(usbssp_data, cmd_trb, event);
+ break;
+ case TRB_SET_DEQ:
+ WARN_ON(slot_id != TRB_TO_SLOT_ID(
+ le32_to_cpu(cmd_trb->generic.field[3])));
+ usbssp_handle_cmd_set_deq(usbssp_data, cmd_trb, cmd_comp_code);
+ break;
+ case TRB_CMD_NOOP:
+ /* Is this an aborted command turned to NO-OP? */
+ if (cmd->status == COMP_COMMAND_RING_STOPPED)
+ cmd_comp_code = COMP_COMMAND_RING_STOPPED;
+ break;
+ case TRB_HALT_ENDPOINT:
+ if (cmd->status == COMP_COMMAND_RING_STOPPED)
+ cmd_comp_code = COMP_COMMAND_RING_STOPPED;
+ break;
+ case TRB_FLUSH_ENDPOINT:
+ if (cmd->status == COMP_COMMAND_RING_STOPPED)
+ cmd_comp_code = COMP_COMMAND_RING_STOPPED;
+ break;
+ case TRB_RESET_EP:
+ WARN_ON(slot_id != TRB_TO_SLOT_ID(
+ le32_to_cpu(cmd_trb->generic.field[3])));
+ usbssp_handle_cmd_reset_ep(usbssp_data, cmd_trb, cmd_comp_code);
+ break;
+ case TRB_RESET_DEV:
+ /* SLOT_ID field in reset device cmd completion event TRB is 0.
+ * Use the SLOT_ID from the command TRB instead.
+ */
+ slot_id = TRB_TO_SLOT_ID(
+ le32_to_cpu(cmd_trb->generic.field[3]));
+
+ WARN_ON(slot_id != 0);
+ usbssp_handle_cmd_reset_dev(usbssp_data, event);
+ break;
+ case TRB_FORCE_HEADER:
+ break;
+ default:
+ /* Skip over unknown commands on the event ring */
+ usbssp_info(usbssp_data, "INFO unknown command type %d\n",
+ cmd_type);
+ break;
+ }
+
+ /* restart timer if this wasn't the last command */
+ if (!list_is_singular(&usbssp_data->cmd_list)) {
+ usbssp_data->current_cmd = list_first_entry(&cmd->cmd_list,
+ struct usbssp_command, cmd_list);
+ usbssp_mod_cmd_timer(usbssp_data, USBSSP_CMD_DEFAULT_TIMEOUT);
+ } else if (usbssp_data->current_cmd == cmd) {
+ usbssp_data->current_cmd = NULL;
+ }
+
+event_handled:
+ usbssp_complete_del_and_free_cmd(cmd, cmd_comp_code);
+ inc_deq(usbssp_data, usbssp_data->cmd_ring);
+}
+
+
+static void handle_vendor_event(struct usbssp_udc *usbssp_data,
+ union usbssp_trb *event)
+{
+ u32 trb_type;
+
+ trb_type = TRB_FIELD_TO_TYPE(le32_to_cpu(event->generic.field[3]));
+ usbssp_dbg(usbssp_data,
+ "Vendor specific event or Babble TRB type = %u\n", trb_type);
+}
+
+static void handle_port_status(struct usbssp_udc *usbssp_data,
+ union usbssp_trb *event)
+{
+ u32 port_id;
+ u32 portsc, cmd_regs;
+ int max_ports;
+ u8 major_revision;
+ __le32 __iomem *port_regs;
+
+ /* Port status change events always have a successful completion code */
+ if (GET_COMP_CODE(le32_to_cpu(event->generic.field[2])) != COMP_SUCCESS)
+ usbssp_err(usbssp_data,
+ "WARN: USBSSP returned failed port status event\n");
+
+
+ port_id = GET_PORT_ID(le32_to_cpu(event->generic.field[0]));
+ usbssp_dbg(usbssp_data,
+ "Port Status Change Event for port %d\n", port_id);
+
+ usbssp_data->devs.port_num = port_id;
+ max_ports = HCS_MAX_PORTS(usbssp_data->hcs_params1);
+
+ if ((port_id <= 0) || (port_id > max_ports)) {
+ usbssp_err(usbssp_data, "Invalid port id %d\n", port_id);
+ inc_deq(usbssp_data, usbssp_data->event_ring);
+ return;
+ }
+
+ if (!usbssp_data->port_major_revision) {
+ /* Figure out to which USB port device is attached:
+ * is it a USB 3.0 port or a USB 2.0/1.1 port?
+ */
+ major_revision = usbssp_data->port_array[port_id - 1];
+
+ if (major_revision == 0) {
+ usbssp_warn(usbssp_data, "Event for port %u not in "
+ "Extended Capabilities, ignoring.\n",
+ port_id);
+ goto cleanup;
+ }
+
+ usbssp_data->port_major_revision = major_revision;
+ }
+
+ port_regs = usbssp_get_port_io_addr(usbssp_data);
+
+ portsc = readl(port_regs);
+ trace_usbssp_handle_port_status(usbssp_data->devs.port_num, portsc);
+ usbssp_data->gadget.speed = usbssp_port_speed(portsc);
+ usbssp_dbg(usbssp_data, "PORTSC info: %s\n",
+ usbssp_decode_portsc(portsc));
+
+ if ((portsc & PORT_PLC) && (portsc & PORT_PLS_MASK) == XDEV_RESUME) {
+ usbssp_dbg(usbssp_data, "port resume event for port %d\n",
+ port_id);
+ cmd_regs = readl(&usbssp_data->op_regs->command);
+ if (!(cmd_regs & CMD_RUN)) {
+ usbssp_warn(usbssp_data, "DC is not running.\n");
+ goto cleanup;
+ }
+ if (DEV_SUPERSPEED_ANY(portsc)) {
+ usbssp_dbg(usbssp_data, "remote wake SS port %d\n",
+ port_id);
+ usbssp_test_and_clear_bit(usbssp_data, port_regs,
+ PORT_PLC);
+ usbssp_set_link_state(usbssp_data, port_regs, XDEV_U0);
+ usbssp_resume_gadget(usbssp_data);
+ goto cleanup;
+ }
+ }
+
+ if ((portsc & PORT_PLC) && (portsc & PORT_PLS_MASK) == XDEV_U0 &&
+ DEV_SUPERSPEED_ANY(portsc)) {
+ usbssp_dbg(usbssp_data, "resume SS port %d\n", port_id);
+ usbssp_test_and_clear_bit(usbssp_data, port_regs, PORT_PLC);
+ }
+
+ if ((portsc & PORT_PLC) && (portsc & PORT_PLS_MASK) == XDEV_U1 &&
+ DEV_SUPERSPEED_ANY(portsc)) {
+ usbssp_dbg(usbssp_data, "suspend U1 SS port %d\n", port_id);
+ usbssp_test_and_clear_bit(usbssp_data, port_regs, PORT_PLC);
+ usbssp_suspend_gadget(usbssp_data);
+ }
+
+ if ((portsc & PORT_PLC) && ((portsc & PORT_PLS_MASK) == XDEV_U2 ||
+ (portsc & PORT_PLS_MASK) == XDEV_U3)) {
+ usbssp_dbg(usbssp_data, "resume SS port %d finished\n",
+ port_id);
+ usbssp_test_and_clear_bit(usbssp_data, port_regs, PORT_PLC);
+ usbssp_suspend_gadget(usbssp_data);
+ }
+
+ /*Attach device */
+ if ((portsc & PORT_CSC) && (portsc & PORT_CONNECT)) {
+ usbssp_dbg(usbssp_data, "Port status change: Device Attached\n");
+ usbssp_data->defered_event |= EVENT_DEV_CONNECTED;
+ queue_work(usbssp_data->bottom_irq_wq,
+ &usbssp_data->bottom_irq);
+ usbssp_test_and_clear_bit(usbssp_data, port_regs, PORT_CSC);
+ }
+
+ /*Detach device*/
+ if ((portsc & PORT_CSC) && !(portsc & PORT_CONNECT)) {
+ usbssp_dbg(usbssp_data,
+ "Port status change: Device Deattached\n");
+ usbssp_data->defered_event |= EVENT_DEV_DISCONECTED;
+ queue_work(usbssp_data->bottom_irq_wq,
+ &usbssp_data->bottom_irq);
+ usbssp_test_and_clear_bit(usbssp_data, port_regs, PORT_CSC);
+ }
+
+ /*Port Reset Change - port is in reset state */
+ if ((portsc & PORT_RC) && (portsc & PORT_RESET)) {
+ usbssp_dbg(usbssp_data,
+ "Port status change: Port reset signaling detected\n");
+ usbssp_test_and_clear_bit(usbssp_data, port_regs, PORT_RC);
+ }
+
+ /*Port Reset Change - port is not in reset state */
+ if ((portsc & PORT_RC) && !(portsc & PORT_RESET)) {
+ usbssp_dbg(usbssp_data,
+ "Port status change: Port reset completion detected\n");
+ usbssp_gadget_reset_interrupt(usbssp_data);
+ usbssp_data->defered_event |= EVENT_USB_RESET;
+ queue_work(usbssp_data->bottom_irq_wq,
+ &usbssp_data->bottom_irq);
+ usbssp_test_and_clear_bit(usbssp_data, port_regs, PORT_RC);
+ }
+
+ /*Port Warm Reset Change*/
+ if (portsc & PORT_WRC) {
+ usbssp_dbg(usbssp_data,
+ "Port status change: Port Warm Reset detected\n");
+ usbssp_test_and_clear_bit(usbssp_data, port_regs, PORT_WRC);
+ }
+
+ /*Port Over-Curretn Change*/
+ if (portsc & PORT_OCC) {
+ usbssp_dbg(usbssp_data,
+ "Port status change: Port Over Current detected\n");
+ usbssp_test_and_clear_bit(usbssp_data, port_regs, PORT_OCC);
+ }
+
+ /*Port Configure Error Change*/
+ if (portsc & PORT_CEC) {
+ usbssp_dbg(usbssp_data,
+ "Port status change: Port Configure Error detected\n");
+ usbssp_test_and_clear_bit(usbssp_data, port_regs, PORT_CEC);
+ }
+
+ if (usbssp_data->port_major_revision == 0x02) {
+ usbssp_test_and_clear_bit(usbssp_data, port_regs,
+ PORT_PLC);
+ }
+
+cleanup:
+ /* Update event ring dequeue pointer before dropping the lock */
+ inc_deq(usbssp_data, usbssp_data->event_ring);
+
+}
+
+/*
+ * This TD is defined by the TRBs starting at start_trb in start_seg and ending
+ * at end_trb, which may be in another segment. If the suspect DMA address is a
+ * TRB in this TD, this function returns that TRB's segment. Otherwise it
+ * returns 0.
+ */
+struct usbssp_segment *usbssp_trb_in_td(struct usbssp_udc *usbssp_data,
+ struct usbssp_segment *start_seg,
+ union usbssp_trb *start_trb,
+ union usbssp_trb *end_trb,
+ dma_addr_t suspect_dma,
+ bool debug)
+{
+ dma_addr_t start_dma;
+ dma_addr_t end_seg_dma;
+ dma_addr_t end_trb_dma;
+ struct usbssp_segment *cur_seg;
+
+ start_dma = usbssp_trb_virt_to_dma(start_seg, start_trb);
+ cur_seg = start_seg;
+
+ do {
+ if (start_dma == 0)
+ return NULL;
+ /* We may get an event for a Link TRB in the middle of a TD */
+ end_seg_dma = usbssp_trb_virt_to_dma(cur_seg,
+ &cur_seg->trbs[TRBS_PER_SEGMENT - 1]);
+ /* If the end TRB isn't in this segment, this is set to 0 */
+ end_trb_dma = usbssp_trb_virt_to_dma(cur_seg, end_trb);
+
+ if (debug)
+ usbssp_warn(usbssp_data,
+ "Looking for event-dma %016llx trb-start"
+ "%016llx trb-end %016llx seg-start %016llx"
+ " seg-end %016llx\n",
+ (unsigned long long)suspect_dma,
+ (unsigned long long)start_dma,
+ (unsigned long long)end_trb_dma,
+ (unsigned long long)cur_seg->dma,
+ (unsigned long long)end_seg_dma);
+
+ if (end_trb_dma > 0) {
+ /* The end TRB is in this segment, so suspect should
+ * be here
+ */
+ if (start_dma <= end_trb_dma) {
+ if (suspect_dma >= start_dma &&
+ suspect_dma <= end_trb_dma)
+ return cur_seg;
+ } else {
+ /* Case for one segment with
+ * a TD wrapped around to the top
+ */
+ if ((suspect_dma >= start_dma &&
+ suspect_dma <= end_seg_dma) ||
+ (suspect_dma >= cur_seg->dma &&
+ suspect_dma <= end_trb_dma))
+ return cur_seg;
+ }
+ return NULL;
+ } else {
+ /* Might still be somewhere in this segment */
+ if (suspect_dma >= start_dma &&
+ suspect_dma <= end_seg_dma)
+ return cur_seg;
+ }
+ cur_seg = cur_seg->next;
+ start_dma = usbssp_trb_virt_to_dma(cur_seg, &cur_seg->trbs[0]);
+ } while (cur_seg != start_seg);
+
+ return NULL;
+}
+
+void usbssp_cleanup_halted_endpoint(struct usbssp_udc *usbssp_data,
+ unsigned int ep_index,
+ unsigned int stream_id,
+ struct usbssp_td *td,
+ enum usbssp_ep_reset_type reset_type)
+{
+ struct usbssp_command *command;
+ struct usbssp_ep_ctx *ep_ctx;
+ int interrupt_disabled_locally;
+
+ ep_ctx = usbssp_get_ep_ctx(usbssp_data, usbssp_data->devs.out_ctx,
+ ep_index);
+
+ if (GET_EP_CTX_STATE(ep_ctx) != EP_STATE_HALTED) {
+ usbssp_dbg(usbssp_data,
+ "Endpint index %d is not in halted state.\n",
+ ep_index);
+ usbssp_status_stage(usbssp_data);
+ return;
+ }
+
+ command = usbssp_alloc_command(usbssp_data, true, GFP_ATOMIC);
+ if (!command)
+ return;
+
+ usbssp_queue_reset_ep(usbssp_data, command, ep_index,
+ reset_type);
+
+ usbssp_ring_cmd_db(usbssp_data);
+
+ if (irqs_disabled()) {
+ spin_unlock_irqrestore(&usbssp_data->irq_thread_lock,
+ usbssp_data->irq_thread_flag);
+ interrupt_disabled_locally = 1;
+ } else {
+ spin_unlock(&usbssp_data->irq_thread_lock);
+ }
+
+ wait_for_completion(command->completion);
+
+ if (interrupt_disabled_locally)
+ spin_lock_irqsave(&usbssp_data->irq_thread_lock,
+ usbssp_data->irq_thread_flag);
+ else
+ spin_lock(&usbssp_data->irq_thread_lock);
+
+ usbssp_free_command(usbssp_data, command);
+ if (ep_index != 0)
+ usbssp_status_stage(usbssp_data);
+}
+
+int usbssp_is_vendor_info_code(struct usbssp_udc *usbssp_data, unsigned int trb_comp_code)
+{
+ if (trb_comp_code >= 224 && trb_comp_code <= 255) {
+ /* Vendor defined "informational" completion code,
+ * treat as not-an-error.
+ */
+ usbssp_dbg(usbssp_data,
+ "Vendor defined info completion code %u\n",
+ trb_comp_code);
+ usbssp_dbg(usbssp_data, "Treating code as success.\n");
+ return 1;
+ }
+ return 0;
+}
+
+static int usbssp_td_cleanup(struct usbssp_udc *usbssp_data, struct usbssp_td *td,
+ struct usbssp_ring *ep_ring, int *status)
+{
+ struct usbssp_request *req_priv = NULL;
+
+ /* Clean up the endpoint's TD list */
+ req_priv = td->priv_request;
+
+ /* if a bounce buffer was used to align this td then unmap it */
+ usbssp_unmap_td_bounce_buffer(usbssp_data, ep_ring, td);
+
+ /* Do one last check of the actual transfer length.
+ * If the DC controller said we transferred more data than the buffer
+ * length, req_priv->request.actual will be a very big number (since it's
+ * unsigned). Play it safe and say we didn't transfer anything.
+ */
+ if (req_priv->request.actual > req_priv->request.length) {
+ usbssp_warn(usbssp_data,
+ "USB req %u and actual %u transfer length mismatch\n",
+ req_priv->request.length, req_priv->request.actual);
+ req_priv->request.actual = 0;
+ *status = 0;
+ }
+ list_del_init(&td->td_list);
+
+ inc_td_cnt(req_priv);
+ /* Giveback the USB request when all the tds are completed */
+ if (last_td_in_request(td)) {
+ if ((req_priv->request.actual != req_priv->request.length &&
+ td->priv_request->request.short_not_ok) ||
+ (*status != 0 &&
+ !usb_endpoint_xfer_isoc(req_priv->dep->endpoint.desc)))
+ usbssp_dbg(usbssp_data,
+ "Giveback Request %p, len = %d, expected = %d"
+ " status = %d\n",
+ req_priv, req_priv->request.actual,
+ req_priv->request.length, *status);
+
+ if (usb_endpoint_xfer_isoc(req_priv->dep->endpoint.desc))
+ *status = 0;
+
+ usbssp_giveback_request_in_irq(usbssp_data, td, *status);
+ }
+
+ return 0;
+}
+
+
+static int finish_td(struct usbssp_udc *usbssp_data, struct usbssp_td *td,
+ struct usbssp_transfer_event *event, struct usbssp_ep *ep, int *status)
+{
+ struct usbssp_device *dev_priv;
+ struct usbssp_ring *ep_ring;
+ unsigned int slot_id;
+ int ep_index;
+ struct usbssp_ep_ctx *ep_ctx;
+ u32 trb_comp_code;
+
+ slot_id = TRB_TO_SLOT_ID(le32_to_cpu(event->flags));
+ dev_priv = &usbssp_data->devs;
+ ep_index = TRB_TO_EP_ID(le32_to_cpu(event->flags)) - 1;
+ ep_ring = usbssp_dma_to_transfer_ring(ep, le64_to_cpu(event->buffer));
+ ep_ctx = usbssp_get_ep_ctx(usbssp_data, dev_priv->out_ctx, ep_index);
+ trb_comp_code = GET_COMP_CODE(le32_to_cpu(event->transfer_len));
+
+ if (trb_comp_code == COMP_STOPPED_LENGTH_INVALID ||
+ trb_comp_code == COMP_STOPPED ||
+ trb_comp_code == COMP_STOPPED_SHORT_PACKET) {
+ /* The Endpoint Stop Command completion will take care of any
+ * stopped TDs. A stopped TD may be restarted, so don't update
+ * the ring dequeue pointer or take this TD off any lists yet.
+ */
+ return 0;
+ }
+
+ /* Update ring dequeue pointer */
+ while (ep_ring->dequeue != td->last_trb)
+ inc_deq(usbssp_data, ep_ring);
+
+ inc_deq(usbssp_data, ep_ring);
+
+ return usbssp_td_cleanup(usbssp_data, td, ep_ring, status);
+}
+
+/* sum trb lengths from ring dequeue up to stop_trb, _excluding_ stop_trb */
+static int sum_trb_lengths(struct usbssp_udc *usbssp_data,
+ struct usbssp_ring *ring,
+ union usbssp_trb *stop_trb)
+{
+ u32 sum;
+ union usbssp_trb *trb = ring->dequeue;
+ struct usbssp_segment *seg = ring->deq_seg;
+
+ for (sum = 0; trb != stop_trb; next_trb(usbssp_data, ring, &seg, &trb)) {
+ if (!trb_is_noop(trb) && !trb_is_link(trb))
+ sum += TRB_LEN(le32_to_cpu(trb->generic.field[2]));
+ }
+ return sum;
+}
+
+/*
+ * Process control tds, update USB request status and actual_length.
+ */
+static int process_ctrl_td(struct usbssp_udc *usbssp_data, struct usbssp_td *td,
+ union usbssp_trb *event_trb, struct usbssp_transfer_event *event,
+ struct usbssp_ep *ep_priv, int *status)
+{
+ struct usbssp_device *dev_priv;
+ struct usbssp_ring *ep_ring;
+ unsigned int slot_id;
+ int ep_index;
+ struct usbssp_ep_ctx *ep_ctx;
+ u32 trb_comp_code;
+ u32 remaining, requested;
+ u32 trb_type;
+
+ trb_type = TRB_FIELD_TO_TYPE(le32_to_cpu(event_trb->generic.field[3]));
+ slot_id = TRB_TO_SLOT_ID(le32_to_cpu(event->flags));
+ dev_priv = &usbssp_data->devs;
+ ep_index = TRB_TO_EP_ID(le32_to_cpu(event->flags)) - 1;
+ ep_ring = usbssp_dma_to_transfer_ring(ep_priv, le64_to_cpu(event->buffer));
+ ep_ctx = usbssp_get_ep_ctx(usbssp_data, dev_priv->out_ctx, ep_index);
+ trb_comp_code = GET_COMP_CODE(le32_to_cpu(event->transfer_len));
+ requested = td->priv_request->request.length;
+ remaining = EVENT_TRB_LEN(le32_to_cpu(event->transfer_len));
+
+ switch (trb_comp_code) {
+ case COMP_SUCCESS:
+ *status = 0;
+ break;
+ case COMP_SHORT_PACKET:
+ *status = 0;
+ break;
+ case COMP_STOPPED_SHORT_PACKET:
+ if (trb_type == TRB_DATA || trb_type == TRB_NORMAL)
+ td->priv_request->request.actual = remaining;
+ goto finish_td;
+ case COMP_STOPPED:
+ switch (trb_type) {
+ case TRB_DATA:
+ case TRB_NORMAL:
+ td->priv_request->request.actual =
+ requested - remaining;
+ goto finish_td;
+ case TRB_STATUS:
+ td->priv_request->request.actual = requested;
+ goto finish_td;
+ default:
+ usbssp_warn(usbssp_data,
+ "WARN: unexpected TRB Type %d\n",
+ trb_type);
+ goto finish_td;
+ }
+ case COMP_STOPPED_LENGTH_INVALID:
+ goto finish_td;
+ default:
+ usbssp_dbg(usbssp_data, "TRB error code %u, "
+ "halted endpoint index = %u\n",
+ trb_comp_code, ep_index);
+ }
+
+ /*
+ * if on data stage then update the actual_length of the USB
+ * request and flag it as set, so it won't be overwritten in the event
+ * for the last TRB.
+ */
+ if (trb_type == TRB_DATA ||
+ trb_type == TRB_NORMAL) {
+ td->request_length_set = true;
+ td->priv_request->request.actual = requested - remaining;
+ }
+
+ /* at status stage */
+ if (!td->request_length_set)
+ td->priv_request->request.actual = requested;
+
+ if (usbssp_data->ep0state == USBSSP_EP0_DATA_PHASE
+ && ep_priv->number == 0
+ && usbssp_data->three_stage_setup) {
+
+ td = list_entry(ep_ring->td_list.next,
+ struct usbssp_td, td_list);
+ usbssp_data->ep0state = USBSSP_EP0_STATUS_PHASE;
+ usbssp_dbg(usbssp_data, "Arm Status stage\n");
+ giveback_first_trb(usbssp_data, ep_index, 0,
+ ep_ring->cycle_state, &td->last_trb->generic);
+ return 0;
+ }
+finish_td:
+ return finish_td(usbssp_data, td, event, ep_priv, status);
+}
+
+/*
+ * Process isochronous tds, update usb request status and actual_length.
+ */
+static int process_isoc_td(struct usbssp_udc *usbssp_data, struct usbssp_td *td,
+ union usbssp_trb *ep_trb, struct usbssp_transfer_event *event,
+ struct usbssp_ep *ep_priv, int *status)
+{
+ struct usbssp_ring *ep_ring;
+ struct usbssp_request *req_priv;
+ int idx;
+ u32 trb_comp_code;
+ u32 remaining, requested, ep_trb_len;
+ bool sum_trbs_for_length = false;
+ int short_framestatus;
+
+ ep_ring = usbssp_dma_to_transfer_ring(ep_priv,
+ le64_to_cpu(event->buffer));
+ trb_comp_code = GET_COMP_CODE(le32_to_cpu(event->transfer_len));
+ req_priv = td->priv_request;
+ idx = req_priv->num_tds;
+ requested = req_priv->request.length;
+ remaining = EVENT_TRB_LEN(le32_to_cpu(event->transfer_len));
+ ep_trb_len = TRB_LEN(le32_to_cpu(ep_trb->generic.field[2]));
+ short_framestatus = req_priv->request.short_not_ok ?
+ -EREMOTEIO : 0;
+
+ /* handle completion code */
+ switch (trb_comp_code) {
+ case COMP_SUCCESS:
+ if (remaining) {
+ req_priv->request.status = short_framestatus;
+ break;
+ }
+ req_priv->request.status = 0;
+ break;
+ case COMP_SHORT_PACKET:
+ req_priv->request.status = short_framestatus;
+ sum_trbs_for_length = true;
+ break;
+ case COMP_ISOCH_BUFFER_OVERRUN:
+ case COMP_BABBLE_DETECTED_ERROR:
+ req_priv->request.status = -EOVERFLOW;
+ break;
+ case COMP_USB_TRANSACTION_ERROR:
+ req_priv->request.status = -EPROTO;
+ if (ep_trb != td->last_trb)
+ return 0;
+ break;
+ case COMP_STOPPED:
+ sum_trbs_for_length = true;
+ break;
+ case COMP_STOPPED_SHORT_PACKET:
+ /* field normally containing residue now contains tranferred */
+ req_priv->request.status = short_framestatus;
+ requested = remaining;
+ break;
+ case COMP_STOPPED_LENGTH_INVALID:
+ requested = 0;
+ remaining = 0;
+ break;
+ default:
+ sum_trbs_for_length = true;
+ req_priv->request.status = -1;
+ break;
+ }
+
+ /*Fixme*/
+#if 0
+ if (sum_trbs_for_length)
+ req_priv->request.actual = sum_trb_lengths(usbssp_data,
+ ep_ring, ep_trb) +
+ ep_trb_len - remaining;
+ else
+ req_priv->request.actual = requested;
+
+ td->req_priv->request.actual += frame->actual_length;
+#endif
+ return finish_td(usbssp_data, td, event, ep_priv, status);
+}
+
+static int skip_isoc_td(struct usbssp_udc *usbssp_data,
+ struct usbssp_td *td,
+ struct usbssp_transfer_event *event,
+ struct usbssp_ep *ep_priv,
+ int *status)
+{
+ struct usbssp_ring *ep_ring;
+ struct usbssp_request *req_priv;
+ //struct usb_iso_packet_descriptor *frame;
+ int idx;
+
+ ep_ring = usbssp_dma_to_transfer_ring(ep_priv,
+ le64_to_cpu(event->buffer));
+ req_priv = td->priv_request/*->hcpriv*/;
+ idx = req_priv->num_tds;
+ //TODO
+// frame = &td->priv_request->iso_frame_desc[idx];
+
+ /* The transfer is partly done. */
+// frame->status = -EXDEV;
+
+ /* calc actual length */
+// frame->actual_length = 0;
+
+ /* Update ring dequeue pointer */
+ while (ep_ring->dequeue != td->last_trb)
+ inc_deq(usbssp_data, ep_ring);
+ inc_deq(usbssp_data, ep_ring);
+
+ return finish_td(usbssp_data, td, event, ep_priv, status);
+}
+
+/*
+ * Process bulk and interrupt tds, update usb request status and actual_length.
+ */
+static int process_bulk_intr_td(struct usbssp_udc *usbssp_data,
+ struct usbssp_td *td,
+ union usbssp_trb *ep_trb,
+ struct usbssp_transfer_event *event,
+ struct usbssp_ep *ep, int *status)
+{
+ struct usbssp_ring *ep_ring;
+ u32 trb_comp_code;
+ u32 remaining, requested, ep_trb_len;
+
+ ep_ring = usbssp_dma_to_transfer_ring(ep, le64_to_cpu(event->buffer));
+ trb_comp_code = GET_COMP_CODE(le32_to_cpu(event->transfer_len));
+ remaining = EVENT_TRB_LEN(le32_to_cpu(event->transfer_len));
+ ep_trb_len = TRB_LEN(le32_to_cpu(ep_trb->generic.field[2]));
+ requested = td->priv_request->request.length;
+
+ switch (trb_comp_code) {
+ case COMP_SUCCESS:
+ /* handle success with untransferred data as short packet */
+ if (ep_trb != td->last_trb || remaining) {
+ usbssp_warn(usbssp_data, "WARN Successful completion "
+ "on short TX\n");
+ usbssp_dbg(usbssp_data,
+ "ep %#x - asked for %d bytes, %d bytes untransferred\n",
+ td->priv_request->dep->endpoint.desc->bEndpointAddress,
+ requested, remaining);
+ }
+ *status = 0;
+ break;
+ case COMP_SHORT_PACKET:
+ usbssp_dbg(usbssp_data,
+ "ep %#x - asked for %d bytes, %d bytes untransferred\n",
+ td->priv_request->dep->endpoint.desc->bEndpointAddress,
+ requested, remaining);
+
+ *status = 0;
+ break;
+ case COMP_STOPPED_SHORT_PACKET:
+ td->priv_request->request.length = remaining;
+ goto finish_td;
+ case COMP_STOPPED_LENGTH_INVALID:
+ /* stopped on ep trb with invalid length, exclude it */
+ ep_trb_len = 0;
+ remaining = 0;
+ break;
+ default:
+ /* Others already handled above */
+ break;
+ }
+
+ if (ep_trb == td->last_trb)
+ td->priv_request->request.actual = requested - remaining;
+ else
+ td->priv_request->request.actual =
+ sum_trb_lengths(usbssp_data, ep_ring, ep_trb) +
+ ep_trb_len - remaining;
+finish_td:
+ if (remaining > requested) {
+ usbssp_warn(usbssp_data,
+ "bad transfer trb length %d in event trb\n",
+ remaining);
+ td->priv_request->request.actual = 0;
+ }
+
+ return finish_td(usbssp_data, td, event, ep, status);
+}
+
+/*
+ * If this function returns an error condition, it means it got a Transfer
+ * event with a corrupted Slot ID, Endpoint ID, or TRB DMA address.
+ * At this point, the USBSSP controller is probably hosed and should be reset.
+ */
+static int handle_tx_event(struct usbssp_udc *usbssp_data,
+ struct usbssp_transfer_event *event)
+{
+ struct usbssp_device *dev_priv;
+ struct usbssp_ep *ep_priv;
+ struct usbssp_ring *ep_ring;
+ unsigned int slot_id;
+ int ep_index;
+ struct usbssp_td *td = NULL;
+ dma_addr_t ep_trb_dma;
+ struct usbssp_segment *ep_seg;
+ union usbssp_trb *ep_trb;
+ int status = -EINPROGRESS;
+ struct usbssp_ep_ctx *ep_ctx;
+ struct list_head *tmp;
+ u32 trb_comp_code;
+ int ret = 0;
+ int td_num = 0;
+ bool handling_skipped_tds = false;
+ const struct usb_endpoint_descriptor *desc;
+
+ slot_id = TRB_TO_SLOT_ID(le32_to_cpu(event->flags));
+ ep_index = TRB_TO_EP_ID(le32_to_cpu(event->flags)) - 1;
+ trb_comp_code = GET_COMP_CODE(le32_to_cpu(event->transfer_len));
+ ep_trb_dma = le64_to_cpu(event->buffer);
+
+ dev_priv = &usbssp_data->devs;
+
+ ep_priv = &dev_priv->eps[ep_index];
+ ep_ring = usbssp_dma_to_transfer_ring(ep_priv,
+ le64_to_cpu(event->buffer));
+ ep_ctx = usbssp_get_ep_ctx(usbssp_data, dev_priv->out_ctx, ep_index);
+
+ if (GET_EP_CTX_STATE(ep_ctx) == EP_STATE_DISABLED) {
+ usbssp_err(usbssp_data,
+ "ERROR Transfer event for disabled endpoint slot %u ep %u\n",
+ slot_id, ep_index);
+ goto err_out;
+ }
+
+ /* Some transfer events don't always point to a trb*/
+ if (!ep_ring) {
+ switch (trb_comp_code) {
+ case COMP_USB_TRANSACTION_ERROR:
+ case COMP_INVALID_STREAM_TYPE_ERROR:
+ case COMP_INVALID_STREAM_ID_ERROR:
+ goto cleanup;
+ case COMP_RING_UNDERRUN:
+ case COMP_RING_OVERRUN:
+ goto cleanup;
+ default:
+ usbssp_err(usbssp_data, "ERROR Transfer event for "
+ "unknown stream ring slot %u ep %u\n",
+ slot_id, ep_index);
+ goto err_out;
+ }
+ }
+
+ /* Count current td numbers if ep->skip is set */
+ if (ep_priv->skip) {
+ list_for_each(tmp, &ep_ring->td_list)
+ td_num++;
+ }
+
+ /* Look for common error cases */
+ switch (trb_comp_code) {
+ /* Skip codes that require special handling depending on
+ * transfer type
+ */
+ case COMP_SUCCESS:
+ if (EVENT_TRB_LEN(le32_to_cpu(event->transfer_len)) == 0)
+ break;
+
+ usbssp_warn_ratelimited(usbssp_data,
+ "WARN Successful completion on short TX\n");
+ case COMP_SHORT_PACKET:
+ break;
+ case COMP_STOPPED:
+ usbssp_dbg(usbssp_data, "Stopped on Transfer TRB for ep %u\n",
+ ep_index);
+ break;
+ case COMP_STOPPED_LENGTH_INVALID:
+ usbssp_dbg(usbssp_data,
+ "Stopped on No-op or Link TRB for ep %u\n",
+ ep_index);
+ break;
+ case COMP_STOPPED_SHORT_PACKET:
+ usbssp_dbg(usbssp_data,
+ "Stopped with short packet transfer detected for ep %u\n",
+ ep_index);
+ usbssp_dbg_ctx(usbssp_data, usbssp_data->devs.out_ctx, 2);
+ break;
+ case COMP_BABBLE_DETECTED_ERROR:
+ usbssp_dbg(usbssp_data, "Babble error for ep %u on endpoint\n",
+ ep_index);
+ status = -EOVERFLOW;
+ break;
+ case COMP_TRB_ERROR:
+ usbssp_warn(usbssp_data, "WARN: TRB error on endpoint %u\n",
+ ep_index);
+ status = -EILSEQ;
+ break;
+ /* completion codes not indicating endpoint state change */
+ case COMP_DATA_BUFFER_ERROR:
+ usbssp_warn(usbssp_data,
+ "WARN: USBSSP couldn't access mem fast enough for ep %u\n",
+ ep_index);
+ status = -ENOSR;
+ break;
+ case COMP_ISOCH_BUFFER_OVERRUN:
+ usbssp_warn(usbssp_data,
+ "WARN: buffer overrun event for ep %u on endpoint",
+ ep_index);
+ break;
+ case COMP_RING_UNDERRUN:
+ /*
+ * When the Isoch ring is empty, the DC will generate
+ * a Ring Overrun Event for IN Isoch endpoint or Ring
+ * Underrun Event for OUT Isoch endpoint.
+ */
+ usbssp_dbg(usbssp_data, "underrun event on endpoint\n");
+ if (!list_empty(&ep_ring->td_list))
+ usbssp_dbg(usbssp_data, "Underrun Event for ep %d "
+ "still with TDs queued?\n", ep_index);
+ goto cleanup;
+ case COMP_RING_OVERRUN:
+ usbssp_dbg(usbssp_data, "overrun event on endpoint\n");
+ if (!list_empty(&ep_ring->td_list))
+ usbssp_dbg(usbssp_data, "Overrun Event for ep %d "
+ "still with TDs queued?\n",
+ ep_index);
+ goto cleanup;
+ case COMP_MISSED_SERVICE_ERROR:
+ /*
+ * When encounter missed service error, one or more isoc tds
+ * may be missed by DC.
+ * Set skip flag of the ep_ring; Complete the missed tds as
+ * short transfer when process the ep_ring next time.
+ */
+ ep_priv->skip = true;
+ usbssp_dbg(usbssp_data,
+ "Miss service interval error for ep %u, set skip flag\n",
+ ep_index);
+ goto cleanup;
+ case COMP_INCOMPATIBLE_DEVICE_ERROR:
+ /* needs disable slot command to recover */
+ usbssp_warn(usbssp_data,
+ "WARN: detect an incompatible device for ep %u",
+ ep_index);
+ status = -EPROTO;
+ break;
+ default:
+ if (usbssp_is_vendor_info_code(usbssp_data, trb_comp_code)) {
+ status = 0;
+ break;
+ }
+ usbssp_warn(usbssp_data,
+ "ERROR Unknown event condition %u, for ep %u - USBSSP probably busted\n",
+ trb_comp_code, ep_index);
+ goto cleanup;
+ }
+
+ do {
+ /* This TRB should be in the TD at the head of this ring's
+ * TD list.
+ */
+ if (list_empty(&ep_ring->td_list)) {
+ /*
+ * Don't print wanings if it's due to a stopped endpoint
+ * generating an extra completion event if the device
+ * was suspended. Or, a event for the last TRB of a
+ * short TD we already got a short event for.
+ * The short TD is already removed from the TD list.
+ */
+ if (!(trb_comp_code == COMP_STOPPED ||
+ trb_comp_code == COMP_STOPPED_LENGTH_INVALID ||
+ ep_ring->last_td_was_short)) {
+ usbssp_warn(usbssp_data,
+ "WARN Event TRB for ep %d with no TDs queued?\n",
+ ep_index);
+ }
+
+ if (ep_priv->skip) {
+ ep_priv->skip = false;
+ usbssp_dbg(usbssp_data,
+ "td_list is empty while skip "
+ "flag set. Clear skip flag for ep %u.\n",
+ ep_index);
+ }
+ goto cleanup;
+ }
+
+ /* We've skipped all the TDs on the ep ring when ep->skip set */
+ if (ep_priv->skip && td_num == 0) {
+ ep_priv->skip = false;
+ usbssp_dbg(usbssp_data,
+ "All tds on the ep_ring skipped. "
+ "Clear skip flag for ep %u.\n", ep_index);
+ goto cleanup;
+ }
+
+ td = list_entry(ep_ring->td_list.next, struct usbssp_td,
+ td_list);
+
+ if (ep_priv->skip)
+ td_num--;
+
+ /* Is this a TRB in the currently executing TD? */
+ ep_seg = usbssp_trb_in_td(usbssp_data, ep_ring->deq_seg,
+ ep_ring->dequeue, td->last_trb,
+ ep_trb_dma, false);
+
+ /*
+ * Skip the Force Stopped Event. The event_trb(ep_trb_dma)
+ * of FSE is not in the current TD pointed by ep_ring->dequeue
+ * because that the hardware dequeue pointer still at the
+ * previous TRB of the current TD. The previous TRB maybe a
+ * Link TD or the last TRB of the previous TD. The command
+ * completion handle will take care the rest.
+ */
+ if (!ep_seg && (trb_comp_code == COMP_STOPPED ||
+ trb_comp_code == COMP_STOPPED_LENGTH_INVALID)) {
+ goto cleanup;
+ }
+
+ desc = td->priv_request->dep->endpoint.desc;
+ if (!ep_seg) {
+ if (!ep_priv->skip || !usb_endpoint_xfer_isoc(desc)) {
+
+ /* USBSSP is busted, give up! */
+ usbssp_err(usbssp_data,
+ "ERROR Transfer event TRB DMA ptr not "
+ "part of current TD ep_index %d "
+ "comp_code %u\n", ep_index,
+ trb_comp_code);
+ usbssp_trb_in_td(usbssp_data, ep_ring->deq_seg,
+ ep_ring->dequeue, td->last_trb,
+ ep_trb_dma, true);
+ return -ESHUTDOWN;
+ }
+
+ ret = skip_isoc_td(usbssp_data, td, event, ep_priv,
+ &status);
+ goto cleanup;
+ }
+
+ if (trb_comp_code == COMP_SHORT_PACKET)
+ ep_ring->last_td_was_short = true;
+ else
+ ep_ring->last_td_was_short = false;
+
+ if (ep_priv->skip) {
+ usbssp_dbg(usbssp_data,
+ "Found td. Clear skip flag for ep %u.\n",
+ ep_index);
+ ep_priv->skip = false;
+ }
+
+ ep_trb = &ep_seg->trbs[(ep_trb_dma - ep_seg->dma) / sizeof(*ep_trb)];
+
+ trace_usbssp_handle_transfer(ep_ring,
+ (struct usbssp_generic_trb *) ep_trb);
+
+ if (trb_is_noop(ep_trb)) {
+ usbssp_dbg(usbssp_data,
+ "event_trb is a no-op TRB. Skip it\n");
+ goto cleanup;
+ }
+
+ if (usb_endpoint_xfer_control(desc)) {
+ ret = process_ctrl_td(usbssp_data, td, ep_trb, event,
+ ep_priv, &status);
+ } else if (usb_endpoint_xfer_isoc(desc)) {
+ ret = process_isoc_td(usbssp_data, td, ep_trb,
+ event, ep_priv, &status);
+ } else {
+ ret = process_bulk_intr_td(usbssp_data, td, ep_trb,
+ event, ep_priv, &status);
+ }
+cleanup:
+ handling_skipped_tds = ep_priv->skip &&
+ trb_comp_code != COMP_MISSED_SERVICE_ERROR;
+
+ /*
+ * Do not update event ring dequeue pointer if we're in a loop
+ * processing missed tds.
+ */
+ if (!handling_skipped_tds)
+ inc_deq(usbssp_data, usbssp_data->event_ring);
+ /*
+ * If ep->skip is set, it means there are missed tds on the
+ * endpoint ring need to take care of.
+ * Process them as short transfer until reach the td pointed by
+ * the event.
+ */
+ } while (handling_skipped_tds);
+
+ return 0;
+
+err_out:
+ usbssp_err(usbssp_data, "@%016llx %08x %08x %08x %08x\n",
+ (unsigned long long) usbssp_trb_virt_to_dma(
+ usbssp_data->event_ring->deq_seg,
+ usbssp_data->event_ring->dequeue),
+ lower_32_bits(le64_to_cpu(event->buffer)),
+ upper_32_bits(le64_to_cpu(event->buffer)),
+ le32_to_cpu(event->transfer_len),
+ le32_to_cpu(event->flags));
+ return -ENODEV;
+}
+
+/*
+ * This function handles all events on the event ring.
+ * Function can defers handling of some events to kernel thread.
+ * Returns >0 for "possibly more events to process" (caller should call again),
+ * otherwise 0 if done. In future, <0 returns should indicate error code.
+ */
+int usbssp_handle_event(struct usbssp_udc *usbssp_data)
+{
+ union usbssp_trb *event;
+ int update_ptrs = 1;
+ int ret = 0;
+ __le32 cycle_bit;
+
+ unsigned int trb_comp_code;
+
+ if (!usbssp_data->event_ring || !usbssp_data->event_ring->dequeue) {
+ usbssp_err(usbssp_data, "ERROR event ring not ready\n");
+ return -ENOMEM;
+ }
+
+ event = usbssp_data->event_ring->dequeue;
+
+ cycle_bit = (le32_to_cpu(event->event_cmd.flags) & TRB_CYCLE);
+ /* Does the USBSSP or Driver own the TRB? */
+ if (cycle_bit != usbssp_data->event_ring->cycle_state)
+ return 0;
+
+ trace_usbssp_handle_event(usbssp_data->event_ring, &event->generic);
+
+ /*
+ * Barrier between reading the TRB_CYCLE (valid) flag above and any
+ * speculative reads of the event's flags/data below.
+ */
+ rmb();
+
+ switch ((le32_to_cpu(event->event_cmd.flags) & TRB_TYPE_BITMASK)) {
+ case TRB_TYPE(TRB_COMPLETION):
+ handle_cmd_completion(usbssp_data, &event->event_cmd);
+ break;
+ case TRB_TYPE(TRB_PORT_STATUS):
+ handle_port_status(usbssp_data, event);
+ update_ptrs = 0;
+ break;
+ case TRB_TYPE(TRB_TRANSFER):
+ ret = handle_tx_event(usbssp_data, &event->trans_event);
+
+ if (ret >= 0)
+ update_ptrs = 0;
+ break;
+ case TRB_TYPE(TRB_SETUP): {
+ /*handling of SETUP packet are deferred to thread. */
+
+ usbssp_data->ep0state = USBSSP_EP0_SETUP_PHASE;
+ usbssp_data->setupId = TRB_SETUPID_TO_TYPE(event->trans_event.flags);
+ usbssp_data->setup_speed = TRB_SETUP_SPEEDID(event->trans_event.flags);
+
+ /*save current setup packet. It some case it will be used
+ * latter
+ */
+ usbssp_data->setup = *((struct usb_ctrlrequest *)&event->trans_event.buffer);
+
+ usbssp_dbg(usbssp_data,
+ "Setup packet (id: %d) defered to thread\n",
+ usbssp_data->setupId);
+
+ usbssp_data->defered_event |= EVENT_SETUP_PACKET;
+ queue_work(usbssp_data->bottom_irq_wq,
+ &usbssp_data->bottom_irq);
+ break;
+ }
+
+ case TRB_TYPE(TRB_HC_EVENT):
+ trb_comp_code = GET_COMP_CODE(le32_to_cpu(event->generic.field[2]));
+ usbssp_warn(usbssp_data,
+ "Host Controller Error detected with error code 0x%02x\n",
+ trb_comp_code);
+ /* Look for common error cases */
+ switch (trb_comp_code) {
+ case COMP_EVENT_RING_FULL_ERROR:
+ usbssp_dbg(usbssp_data,
+ "Error: Event Ring Full\n");
+ break;
+ default:
+ usbssp_dbg(usbssp_data,
+ "Not supported completion code\n");
+ }
+ break;
+ default:
+ if ((le32_to_cpu(event->event_cmd.flags) & TRB_TYPE_BITMASK) >=
+ TRB_TYPE(48))
+ handle_vendor_event(usbssp_data, event);
+ else
+ usbssp_warn(usbssp_data, "ERROR unknown event type %d\n",
+ TRB_FIELD_TO_TYPE(
+ le32_to_cpu(event->event_cmd.flags)));
+ }
+
+
+ /* Any of the above functions may drop and re-acquire the lock, so check
+ * to make sure a watchdog timer didn't mark the device as
+ * non-responsive.
+ */
+ if (usbssp_data->usbssp_state & USBSSP_STATE_DYING) {
+ usbssp_dbg(usbssp_data, "USBSSP device dying, returning from "
+ "event handle.\n");
+ return 0;
+ }
+
+ if (update_ptrs) {
+ /* Update SW event ring dequeue pointer */
+ inc_deq(usbssp_data, usbssp_data->event_ring);
+ }
+
+ /* Are there more items on the event ring? Caller will call us again to
+ * check.
+ */
+ return 1;
+}
+
+
+irqreturn_t usbssp_irq(int irq, void *priv)
+{
+ struct usbssp_udc *usbssp_data = (struct usbssp_udc *)priv;
+ union usbssp_trb *event_ring_deq;
+ irqreturn_t ret = IRQ_NONE;
+ unsigned long flags;
+ dma_addr_t deq;
+ u64 temp_64;
+ u32 status;
+
+ spin_lock_irqsave(&usbssp_data->lock, flags);
+
+ /* Check if the USBSSP controller generated the interrupt,
+ * or the irq is shared
+ */
+ status = readl(&usbssp_data->op_regs->status);
+ if (status == ~(u32)0) {
+ usbssp_udc_died(usbssp_data);
+ ret = IRQ_HANDLED;
+ goto out;
+ }
+
+ if (!(status & STS_EINT))
+ goto out;
+
+ if (status & STS_FATAL) {
+ usbssp_warn(usbssp_data, "WARNING: Device Controller Error\n");
+ usbssp_halt(usbssp_data);
+ ret = IRQ_HANDLED;
+ goto out;
+ }
+
+ /*
+ * Clear the op reg interrupt status first,
+ * so we can receive interrupts from other MSI-X interrupters.
+ * Write 1 to clear the interrupt status.
+ */
+ status |= STS_EINT;
+ writel(status, &usbssp_data->op_regs->status);
+
+ if (usbssp_data->msi_enabled) {
+ u32 irq_pending;
+
+ irq_pending = readl(&usbssp_data->ir_set->irq_pending);
+ irq_pending |= IMAN_IP;
+ writel(irq_pending, &usbssp_data->ir_set->irq_pending);
+ }
+
+ if (usbssp_data->usbssp_state & USBSSP_STATE_DYING ||
+ usbssp_data->usbssp_state & USBSSP_STATE_HALTED) {
+ usbssp_dbg(usbssp_data,
+ "USBSSP controller dying, ignoring interrupt. "
+ "Shouldn't IRQs be disabled?\n");
+ /* Clear the event handler busy flag (RW1C);
+ * the event ring should be empty.
+ */
+ temp_64 = usbssp_read_64(usbssp_data,
+ &usbssp_data->ir_set->erst_dequeue);
+ usbssp_write_64(usbssp_data, temp_64 | ERST_EHB,
+ &usbssp_data->ir_set->erst_dequeue);
+ ret = IRQ_HANDLED;
+ goto out;
+ }
+
+ event_ring_deq = usbssp_data->event_ring->dequeue;
+
+ while ((ret = usbssp_handle_event(usbssp_data)) == 1) {
+ }
+
+ temp_64 = usbssp_read_64(usbssp_data,
+ &usbssp_data->ir_set->erst_dequeue);
+ /* If necessary, update the HW's version of the event ring deq ptr. */
+ if (event_ring_deq != usbssp_data->event_ring->dequeue) {
+
+ deq = usbssp_trb_virt_to_dma(usbssp_data->event_ring->deq_seg,
+ usbssp_data->event_ring->dequeue);
+
+ if (deq == 0)
+ usbssp_warn(usbssp_data,
+ "WARN something wrong with SW event "
+ "ring dequeue ptr.\n");
+ /* Update USBSSP event ring dequeue pointer */
+ temp_64 &= ERST_PTR_MASK;
+ temp_64 |= ((u64) deq & (u64) ~ERST_PTR_MASK);
+ }
+
+ /* Clear the event handler busy flag (RW1C); event ring is empty. */
+ temp_64 |= ERST_EHB;
+ usbssp_write_64(usbssp_data, temp_64,
+ &usbssp_data->ir_set->erst_dequeue);
+ ret = IRQ_HANDLED;
+
+out:
+ spin_unlock_irqrestore(&usbssp_data->lock, flags);
+ return ret;
+}
+
+irqreturn_t usbssp_msi_irq(int irq, void *usbssp_data)
+{
+ return usbssp_irq(irq, usbssp_data);
+}
+
+/**** Endpoint Ring Operations ****/
+
+/*
+ * Generic function for queueing a TRB on a ring.
+ * The caller must have checked to make sure there's room on the ring.
+ *
+ * @more_trbs_coming: Will you enqueue more TRBs before calling
+ * prepare_transfer()?
+ */
+static void queue_trb(struct usbssp_udc *usbssp_data, struct usbssp_ring *ring,
+ bool more_trbs_coming,
+ u32 field1, u32 field2, u32 field3, u32 field4)
+{
+ struct usbssp_generic_trb *trb;
+
+ trb = &ring->enqueue->generic;
+
+ usbssp_dbg(usbssp_data, "Queue TRB at virt: %p, dma: %llx\n", trb,
+ usbssp_trb_virt_to_dma(ring->enq_seg, ring->enqueue));
+
+ trb->field[0] = cpu_to_le32(field1);
+ trb->field[1] = cpu_to_le32(field2);
+ trb->field[2] = cpu_to_le32(field3);
+ trb->field[3] = cpu_to_le32(field4);
+
+ trace_usbssp_queue_trb(ring, trb);
+ inc_enq(usbssp_data, ring, more_trbs_coming);
+}
+
+/*
+ * Does various checks on the endpoint ring, and makes it ready to
+ * queue num_trbs.
+ */
+static int prepare_ring(struct usbssp_udc *usbssp_data,
+ struct usbssp_ring *ep_ring,
+ u32 ep_state, unsigned
+ int num_trbs,
+ gfp_t mem_flags)
+{
+ unsigned int num_trbs_needed;
+
+ /* Make sure the endpoint has been added to USBSSP schedule */
+ switch (ep_state) {
+ case EP_STATE_DISABLED:
+ usbssp_warn(usbssp_data,
+ "WARN request submitted to disabled ep\n");
+ return -ENOENT;
+ case EP_STATE_ERROR:
+ usbssp_warn(usbssp_data,
+ "WARN waiting for error on ep to be cleared\n");
+ return -EINVAL;
+ case EP_STATE_HALTED:
+ usbssp_dbg(usbssp_data,
+ "WARN halted endpoint, queueing request anyway.\n");
+ case EP_STATE_STOPPED:
+ case EP_STATE_RUNNING:
+ break;
+ default:
+ usbssp_err(usbssp_data,
+ "ERROR unknown endpoint state for ep\n");
+ return -EINVAL;
+ }
+
+ while (1) {
+ if (room_on_ring(usbssp_data, ep_ring, num_trbs))
+ break;
+
+ if (ep_ring == usbssp_data->cmd_ring) {
+ usbssp_err(usbssp_data,
+ "Do not support expand command ring\n");
+ return -ENOMEM;
+ }
+
+ usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_ring_expansion,
+ "ERROR no room on ep ring, try ring expansion");
+
+ num_trbs_needed = num_trbs - ep_ring->num_trbs_free;
+ if (usbssp_ring_expansion(usbssp_data, ep_ring, num_trbs_needed,
+ mem_flags)) {
+ usbssp_err(usbssp_data, "Ring expansion failed\n");
+ return -ENOMEM;
+ }
+ }
+
+ while (trb_is_link(ep_ring->enqueue)) {
+
+ ep_ring->enqueue->link.control |= cpu_to_le32(TRB_CHAIN);
+ wmb();
+ ep_ring->enqueue->link.control ^= cpu_to_le32(TRB_CYCLE);
+
+ /* Toggle the cycle bit after the last ring segment. */
+ if (link_trb_toggles_cycle(ep_ring->enqueue))
+ ep_ring->cycle_state ^= 1;
+ ep_ring->enq_seg = ep_ring->enq_seg->next;
+ ep_ring->enqueue = ep_ring->enq_seg->trbs;
+ }
+ return 0;
+}
+
+static int prepare_transfer(struct usbssp_udc *usbssp_data,
+ struct usbssp_device *dev_priv,
+ unsigned int ep_index,
+ unsigned int stream_id,
+ unsigned int num_trbs,
+ struct usbssp_request *req_priv,
+ unsigned int td_index,
+ gfp_t mem_flags)
+{
+ int ret;
+ struct usbssp_td *td;
+ struct usbssp_ring *ep_ring;
+ struct usbssp_ep_ctx *ep_ctx = usbssp_get_ep_ctx(usbssp_data,
+ dev_priv->out_ctx, ep_index);
+
+ ep_ring = usbssp_stream_id_to_ring(dev_priv, ep_index, stream_id);
+
+ if (!ep_ring) {
+ usbssp_dbg(usbssp_data,
+ "Can't prepare ring for bad stream ID %u\n",
+ stream_id);
+ return -EINVAL;
+ }
+
+ ret = prepare_ring(usbssp_data, ep_ring, GET_EP_CTX_STATE(ep_ctx),
+ num_trbs, mem_flags);
+
+ if (ret)
+ return ret;
+
+ td = &req_priv->td[td_index];
+ INIT_LIST_HEAD(&td->td_list);
+
+ td->priv_request = req_priv;
+ /* Add this TD to the tail of the endpoint ring's TD list */
+ list_add_tail(&td->td_list, &ep_ring->td_list);
+ td->start_seg = ep_ring->enq_seg;
+ td->first_trb = ep_ring->enqueue;
+
+ return 0;
+}
+
+unsigned int count_trbs(u64 addr, u64 len)
+{
+ unsigned int num_trbs;
+
+ num_trbs = DIV_ROUND_UP(len + (addr & (TRB_MAX_BUFF_SIZE - 1)),
+ TRB_MAX_BUFF_SIZE);
+ if (num_trbs == 0)
+ num_trbs++;
+
+ return num_trbs;
+}
+
+static inline unsigned int count_trbs_needed(struct usbssp_request *req_priv)
+{
+ return count_trbs(req_priv->request.dma, req_priv->request.length);
+}
+
+static unsigned int count_sg_trbs_needed(struct usbssp_request *req_priv)
+{
+ struct scatterlist *sg;
+ unsigned int i, len, full_len, num_trbs = 0;
+
+ full_len = req_priv->request.length;
+
+ for_each_sg(req_priv->sg, sg, req_priv->num_pending_sgs, i) {
+ len = sg_dma_len(sg);
+ num_trbs += count_trbs(sg_dma_address(sg), len);
+ len = min_t(unsigned int, len, full_len);
+ full_len -= len;
+ if (full_len == 0)
+ break;
+ }
+
+ return num_trbs;
+}
+
+static unsigned int count_isoc_trbs_needed(struct usbssp_request *req_priv)
+{
+ u64 addr, len;
+
+ addr = (u64) req_priv->request.dma;
+ len = req_priv->request.length;
+
+ return count_trbs(addr, len);
+}
+
+static void check_trb_math(struct usbssp_request *req_priv, int running_total)
+{
+ if (unlikely(running_total != req_priv->request.length))
+ dev_err(req_priv->dep->usbssp_data->dev,
+ "%s - ep %#x - Miscalculated tx length, "
+ "queued %#x (%d), asked for %#x (%d)\n",
+ __func__,
+ req_priv->dep->endpoint.desc->bEndpointAddress,
+ running_total, running_total,
+ req_priv->request.length,
+ req_priv->request.length);
+}
+
+static void giveback_first_trb(struct usbssp_udc *usbssp_data,
+ unsigned int ep_index,
+ unsigned int stream_id,
+ int start_cycle,
+ struct usbssp_generic_trb *start_trb)
+{
+ /*
+ * Pass all the TRBs to the hardware at once and make sure this write
+ * isn't reordered.
+ */
+ wmb();
+ if (start_cycle)
+ start_trb->field[3] |= cpu_to_le32(start_cycle);
+ else
+ start_trb->field[3] &= cpu_to_le32(~TRB_CYCLE);
+
+ usbssp_dbg_ep_rings(usbssp_data, ep_index,
+ &usbssp_data->devs.eps[ep_index]);
+ usbssp_ring_ep_doorbell(usbssp_data, ep_index, stream_id);
+}
+
+/*
+ * USBSSP uses normal TRBs for both bulk and interrupt. When the interrupt
+ * endpoint is to be serviced, the DC will consume (at most) one TD. A TD
+ * (comprised of sg list entries) can take several service intervals to
+ * transmit.
+ */
+int usbssp_queue_intr_tx(struct usbssp_udc *usbssp_data, gfp_t mem_flags,
+ struct usbssp_request *req_priv, unsigned int ep_index)
+{
+ struct usbssp_ep_ctx *ep_ctx;
+
+ ep_ctx = usbssp_get_ep_ctx(usbssp_data, usbssp_data->devs.out_ctx,
+ ep_index);
+
+ return usbssp_queue_bulk_tx(usbssp_data, mem_flags, req_priv, ep_index);
+}
+
+/*
+ * For USBSSP controllers, TD size is the number of max packet sized
+ * packets remaining in the TD (*not* including this TRB).
+ *
+ * Total TD packet count = total_packet_count =
+ * DIV_ROUND_UP(TD size in bytes / wMaxPacketSize)
+ *
+ * Packets transferred up to and including this TRB = packets_transferred =
+ * rounddown(total bytes transferred including this TRB / wMaxPacketSize)
+ *
+ * TD size = total_packet_count - packets_transferred
+ *
+ * For USBSSP it must fit in bits 21:17, so it can't be bigger than 31.
+ * This is taken care of in the TRB_TD_SIZE() macro
+ *
+ * The last TRB in a TD must have the TD size set to zero.
+ */
+static u32 usbssp_td_remainder(struct usbssp_udc *usbssp_data,
+ int transferred,
+ int trb_buff_len,
+ unsigned int td_total_len,
+ struct usbssp_request *req_priv,
+ bool more_trbs_coming)
+{
+ u32 maxp, total_packet_count;
+
+ /* One TRB with a zero-length data packet. */
+ if (!more_trbs_coming || (transferred == 0 && trb_buff_len == 0) ||
+ trb_buff_len == td_total_len)
+ return 0;
+
+ maxp = usb_endpoint_maxp(req_priv->dep->endpoint.desc);
+ total_packet_count = DIV_ROUND_UP(td_total_len, maxp);
+
+ /* Queuing functions don't count the current TRB into transferred */
+ return (total_packet_count - ((transferred + trb_buff_len) / maxp));
+}
+
+static int usbssp_align_td(struct usbssp_udc *usbssp_data,
+ struct usbssp_request *req_priv, u32 enqd_len,
+ u32 *trb_buff_len, struct usbssp_segment *seg)
+{
+ struct device *dev = usbssp_data->dev;
+ unsigned int unalign;
+ unsigned int max_pkt;
+ u32 new_buff_len;
+
+ max_pkt = GET_MAX_PACKET(
+ usb_endpoint_maxp(req_priv->dep->endpoint.desc));
+ unalign = (enqd_len + *trb_buff_len) % max_pkt;
+
+ /* we got lucky, last normal TRB data on segment is packet aligned */
+ if (unalign == 0)
+ return 0;
+
+ usbssp_dbg(usbssp_data, "Unaligned %d bytes, buff len %d\n",
+ unalign, *trb_buff_len);
+
+ /* is the last nornal TRB alignable by splitting it */
+ if (*trb_buff_len > unalign) {
+ *trb_buff_len -= unalign;
+ usbssp_dbg(usbssp_data, "split align, new buff len %d\n",
+ *trb_buff_len);
+ return 0;
+ }
+
+ /*
+ * We want enqd_len + trb_buff_len to sum up to a number aligned to
+ * number which is divisible by the endpoint's wMaxPacketSize. IOW:
+ * (size of currently enqueued TRBs + remainder) % wMaxPacketSize == 0.
+ */
+ new_buff_len = max_pkt - (enqd_len % max_pkt);
+
+ if (new_buff_len > (req_priv->request.length - enqd_len))
+ new_buff_len = (req_priv->request.length - enqd_len);
+
+ /* create a max max_pkt sized bounce buffer pointed to by last trb */
+ if (req_priv->direction) {
+ sg_pcopy_to_buffer(req_priv->request.sg,
+ req_priv->request.num_mapped_sgs,
+ seg->bounce_buf, new_buff_len, enqd_len);
+ seg->bounce_dma = dma_map_single(dev, seg->bounce_buf,
+ max_pkt, DMA_TO_DEVICE);
+ } else {
+ seg->bounce_dma = dma_map_single(dev, seg->bounce_buf,
+ max_pkt, DMA_FROM_DEVICE);
+ }
+
+ if (dma_mapping_error(dev, seg->bounce_dma)) {
+ /* try without aligning.*/
+ usbssp_warn(usbssp_data,
+ "Failed mapping bounce buffer, not aligning\n");
+ return 0;
+ }
+ *trb_buff_len = new_buff_len;
+ seg->bounce_len = new_buff_len;
+ seg->bounce_offs = enqd_len;
+
+ usbssp_dbg(usbssp_data, "Bounce align, new buff len %d\n",
+ *trb_buff_len);
+
+ return 1;
+}
+
+int usbssp_queue_bulk_tx(struct usbssp_udc *usbssp_data,
+ gfp_t mem_flags,
+ struct usbssp_request *req_priv,
+ unsigned int ep_index)
+{
+ struct usbssp_ring *ring;
+ struct usbssp_td *td;
+ struct usbssp_generic_trb *start_trb;
+ struct scatterlist *sg = NULL;
+ bool more_trbs_coming = true;
+ bool need_zero_pkt = false;
+ bool first_trb = true;
+ unsigned int num_trbs;
+ unsigned int start_cycle, num_sgs = 0;
+ unsigned int enqd_len, block_len, trb_buff_len, full_len;
+ int sent_len, ret;
+ u32 field, length_field, remainder;
+ u64 addr, send_addr;
+
+ ring = usbssp_request_to_transfer_ring(usbssp_data, req_priv);
+ if (!ring)
+ return -EINVAL;
+
+ full_len = req_priv->request.length;
+ /* If we have scatter/gather list, we use it. */
+ if (req_priv->request.num_sgs) {
+ num_sgs = req_priv->num_pending_sgs;
+ sg = req_priv->sg;
+ addr = (u64) sg_dma_address(sg);
+ block_len = sg_dma_len(sg);
+ num_trbs = count_sg_trbs_needed(req_priv);
+ } else {
+ num_trbs = count_trbs_needed(req_priv);
+ addr = (u64) req_priv->request.dma;
+ block_len = full_len;
+ }
+
+ ret = prepare_transfer(usbssp_data, &usbssp_data->devs,
+ ep_index, req_priv->request.stream_id,
+ num_trbs, req_priv, 0, mem_flags);
+ if (unlikely(ret < 0))
+ return ret;
+
+ /* Deal with request.zero - need one more td/trb */
+ if (req_priv->request.zero && req_priv->num_tds_done > 1)
+ need_zero_pkt = true;
+
+ td = &req_priv->td[0];
+
+ usbssp_dbg(usbssp_data, "Queue Bulk transfer to %s - ep_index: %d,"
+ " num trb: %d, block len %d, nzp: %d\n",
+ req_priv->dep->name, ep_index,
+ num_trbs, block_len, need_zero_pkt);
+
+ /*
+ * Don't give the first TRB to the hardware (by toggling the cycle bit)
+ * until we've finished creating all the other TRBs. The ring's cycle
+ * state may change as we enqueue the other TRBs, so save it too.
+ */
+ start_trb = &ring->enqueue->generic;
+ start_cycle = ring->cycle_state;
+ send_addr = addr;
+
+ /* Queue the TRBs, even if they are zero-length */
+ for (enqd_len = 0; first_trb || enqd_len < full_len;
+ enqd_len += trb_buff_len) {
+ field = TRB_TYPE(TRB_NORMAL);
+
+ /* TRB buffer should not cross 64KB boundaries */
+ trb_buff_len = TRB_BUFF_LEN_UP_TO_BOUNDARY(addr);
+ trb_buff_len = min_t(unsigned int, trb_buff_len, block_len);
+
+ if (enqd_len + trb_buff_len > full_len)
+ trb_buff_len = full_len - enqd_len;
+
+ /* Don't change the cycle bit of the first TRB until later */
+ if (first_trb) {
+ first_trb = false;
+ if (start_cycle == 0)
+ field |= TRB_CYCLE;
+ } else
+ field |= ring->cycle_state;
+
+ /* Chain all the TRBs together; clear the chain bit in the last
+ * TRB to indicate it's the last TRB in the chain.
+ */
+ if (enqd_len + trb_buff_len < full_len) {
+ field |= TRB_CHAIN;
+ if (trb_is_link(ring->enqueue + 1)) {
+ if (usbssp_align_td(usbssp_data, req_priv,
+ enqd_len, &trb_buff_len,
+ ring->enq_seg)) {
+ send_addr = ring->enq_seg->bounce_dma;
+ /* assuming TD won't span 2 segs */
+ td->bounce_seg = ring->enq_seg;
+ }
+ }
+ }
+ if (enqd_len + trb_buff_len >= full_len) {
+ field &= ~TRB_CHAIN;
+ field |= TRB_IOC;
+ more_trbs_coming = false;
+ td->last_trb = ring->enqueue;
+ }
+
+ /* Only set interrupt on short packet for OUT endpoints */
+ if (!req_priv->direction)
+ field |= TRB_ISP;
+
+ /* Set the TRB length, TD size, and interrupter fields. */
+ remainder = usbssp_td_remainder(usbssp_data, enqd_len,
+ trb_buff_len, full_len, req_priv,
+ more_trbs_coming);
+
+ length_field = TRB_LEN(trb_buff_len) |
+ TRB_TD_SIZE(remainder) |
+ TRB_INTR_TARGET(0);
+
+ queue_trb(usbssp_data, ring, more_trbs_coming | need_zero_pkt,
+ lower_32_bits(send_addr),
+ upper_32_bits(send_addr),
+ length_field,
+ field);
+
+ addr += trb_buff_len;
+ sent_len = trb_buff_len;
+
+ while (sg && sent_len >= block_len) {
+ /* New sg entry */
+ --num_sgs;
+ sent_len -= block_len;
+ if (num_sgs != 0) {
+ sg = sg_next(sg);
+ block_len = sg_dma_len(sg);
+ addr = (u64) sg_dma_address(sg);
+ addr += sent_len;
+ }
+ }
+ block_len -= sent_len;
+ send_addr = addr;
+ }
+
+ if (need_zero_pkt) {
+ ret = prepare_transfer(usbssp_data, &usbssp_data->devs,
+ ep_index, req_priv->request.stream_id,
+ 1, req_priv, 1, mem_flags);
+ req_priv->td[1].last_trb = ring->enqueue;
+ field = TRB_TYPE(TRB_NORMAL) | ring->cycle_state | TRB_IOC;
+ queue_trb(usbssp_data, ring, 0, 0, 0,
+ TRB_INTR_TARGET(0), field);
+ }
+
+ check_trb_math(req_priv, enqd_len);
+ giveback_first_trb(usbssp_data, ep_index, req_priv->request.stream_id,
+ start_cycle, start_trb);
+ return 0;
+}
+
+int usbssp_queue_ctrl_tx(struct usbssp_udc *usbssp_data,
+ gfp_t mem_flags,
+ struct usbssp_request *req_priv,
+ unsigned int ep_index)
+{
+ struct usbssp_ring *ep_ring;
+ int num_trbs;
+ int ret;
+ struct usbssp_generic_trb *start_trb;
+ int start_cycle;
+ u32 field, length_field, remainder;
+ struct usbssp_td *td;
+ struct usbssp_ep *dep = req_priv->dep;
+
+ ep_ring = usbssp_request_to_transfer_ring(usbssp_data, req_priv);
+ if (!ep_ring)
+ return -EINVAL;
+
+ if (usbssp_data->delayed_status) {
+ usbssp_dbg(usbssp_data, "Queue CTRL: delayed finished\n");
+ usbssp_data->delayed_status = false;
+ usb_gadget_set_state(&usbssp_data->gadget,
+ USB_STATE_CONFIGURED);
+ }
+
+ if (usbssp_data->bos_event_detected) {
+ usbssp_data->bos_event_detected = 0;
+ usb_gadget_unmap_request_by_dev(usbssp_data->dev,
+ &req_priv->request,
+ dep->direction);
+ usbssp_set_usb2_hardware_lpm(usbssp_data,
+ &req_priv->request, 1);
+ ret = usb_gadget_map_request_by_dev(usbssp_data->dev,
+ &req_priv->request, dep->direction);
+ }
+
+ /* 1 TRB for data, 1 for status */
+ if (usbssp_data->three_stage_setup)
+ num_trbs = 2;
+ else
+ num_trbs = 1;
+
+ ret = prepare_transfer(usbssp_data, &usbssp_data->devs,
+ req_priv->epnum, req_priv->request.stream_id,
+ num_trbs, req_priv, 0, mem_flags);
+
+ if (ret < 0)
+ return ret;
+
+ td = &req_priv->td[0];
+ /*
+ * Don't give the first TRB to the hardware (by toggling the cycle bit)
+ * until we've finished creating all the other TRBs. The ring's cycle
+ * state may change as we enqueue the other TRBs, so save it too.
+ */
+ start_trb = &ep_ring->enqueue->generic;
+ start_cycle = ep_ring->cycle_state;
+
+ /* If there's data, queue data TRBs */
+ /* Only set interrupt on short packet for OUT endpoints */
+
+ if (usbssp_data->ep0_expect_in)
+ field = TRB_TYPE(TRB_DATA) | TRB_IOC;
+ else
+ field = TRB_ISP | TRB_TYPE(TRB_DATA) | TRB_IOC;
+
+ if (req_priv->request.length > 0) {
+ remainder = usbssp_td_remainder(usbssp_data, 0,
+ req_priv->request.length,
+ req_priv->request.length, req_priv, 1);
+
+ length_field = TRB_LEN(req_priv->request.length) |
+ TRB_TD_SIZE(remainder) |
+ TRB_INTR_TARGET(0);
+
+ if (usbssp_data->ep0_expect_in)
+ field |= TRB_DIR_IN;
+
+ queue_trb(usbssp_data, ep_ring, true,
+ lower_32_bits(req_priv->request.dma),
+ upper_32_bits(req_priv->request.dma),
+ length_field,
+ field | ep_ring->cycle_state |
+ TRB_SETUPID(usbssp_data->setupId) |
+ usbssp_data->setup_speed);
+ usbssp_data->ep0state = USBSSP_EP0_DATA_PHASE;
+ }
+
+ /* Save the DMA address of the last TRB in the TD */
+ td->last_trb = ep_ring->enqueue;
+
+ /* Queue status TRB*/
+ /* If the device sent data, the status stage is an OUT transfer */
+
+ if (req_priv->request.length > 0 && usbssp_data->ep0_expect_in)
+ field = TRB_DIR_IN;
+ else
+ field = 0;
+
+ if (req_priv->request.length == 0)
+ field |= ep_ring->cycle_state;
+ else
+ field |= (ep_ring->cycle_state ^ 1);
+
+ if (dep->ep_state & EP0_HALTED_STATUS) {
+ /* If endpoint should be halted in Status Stage then
+ * driver shall set TRB_SETUPSTAT_STALL bit
+ */
+ usbssp_dbg(usbssp_data,
+ "Status Stage phase prepared with STALL bit\n");
+ dep->ep_state &= ~EP0_HALTED_STATUS;
+ field |= TRB_SETUPSTAT(TRB_SETUPSTAT_STALL);
+ } else {
+ field |= TRB_SETUPSTAT(TRB_SETUPSTAT_ACK);
+ }
+
+ queue_trb(usbssp_data, ep_ring, false,
+ 0,
+ 0,
+ TRB_INTR_TARGET(0),
+ /* Event on completion */
+ field | TRB_IOC | TRB_SETUPID(usbssp_data->setupId) |
+ TRB_TYPE(TRB_STATUS) | usbssp_data->setup_speed);
+
+ usbssp_dbg_ep_rings(usbssp_data, 0, dep);
+ usbssp_ring_ep_doorbell(usbssp_data, ep_index,
+ req_priv->request.stream_id);
+ return 0;
+}
+
+/* Stop endpoint after disconnecting device.*/
+int usbssp_cmd_stop_ep(struct usbssp_udc *usbssp_data, struct usb_gadget *g,
+ struct usbssp_ep *ep_priv)
+{
+ int ret = 0;
+ struct usbssp_command *command;
+ unsigned int ep_index;
+ struct usbssp_container_ctx *out_ctx;
+ struct usbssp_ep_ctx *ep_ctx;
+ int interrupt_disabled_locally = 0;
+
+ ep_index = usbssp_get_endpoint_index(ep_priv->endpoint.desc);
+
+ if ((ep_priv->ep_state & EP_STOP_CMD_PENDING)) {
+ usbssp_dbg(usbssp_data,
+ "Stop endpoint command on %s (index: %d) is pending\n",
+ ep_priv->name, ep_index);
+ return 0;
+ }
+
+ command = usbssp_alloc_command(usbssp_data, true, GFP_ATOMIC);
+ if (!command)
+ return -ENOMEM;
+
+ ep_priv->ep_state |= EP_STOP_CMD_PENDING;
+
+ usbssp_queue_stop_endpoint(usbssp_data, command,
+ ep_index, 0);
+ usbssp_ring_cmd_db(usbssp_data);
+
+ out_ctx = usbssp_data->devs.out_ctx;
+ ep_ctx = usbssp_get_ep_ctx(usbssp_data, out_ctx, ep_index);
+
+ if (irqs_disabled()) {
+ spin_unlock_irqrestore(&usbssp_data->irq_thread_lock,
+ usbssp_data->irq_thread_flag);
+ interrupt_disabled_locally = 1;
+ } else {
+ spin_unlock(&usbssp_data->irq_thread_lock);
+ }
+
+ /* Wait for last stop endpoint command to finish */
+ wait_for_completion(command->completion);
+
+ if (interrupt_disabled_locally)
+ spin_lock_irqsave(&usbssp_data->irq_thread_lock,
+ usbssp_data->irq_thread_flag);
+ else
+ spin_lock(&usbssp_data->irq_thread_lock);
+
+ if (command->status == COMP_COMMAND_ABORTED ||
+ command->status == COMP_COMMAND_RING_STOPPED) {
+ usbssp_warn(usbssp_data,
+ "Timeout while waiting for stop endpoint command\n");
+ ret = -ETIME;
+ }
+
+ usbssp_free_command(usbssp_data, command);
+ return ret;
+}
+
+/*
+ * The transfer burst count field of the isochronous TRB defines the number of
+ * bursts that are required to move all packets in this TD. Only SuperSpeed
+ * devices can burst up to bMaxBurst number of packets per service interval.
+ * This field is zero based, meaning a value of zero in the field means one
+ * burst. Basically, for everything but SuperSpeed devices, this field will be
+ * zero.
+ */
+static unsigned int usbssp_get_burst_count(struct usbssp_udc *usbssp_data,
+ struct usbssp_request *req_priv,
+ unsigned int total_packet_count)
+{
+ unsigned int max_burst;
+
+ if (usbssp_data->gadget.speed < USB_SPEED_SUPER)
+ return 0;
+
+ max_burst = req_priv->dep->endpoint.comp_desc->bMaxBurst;
+ return DIV_ROUND_UP(total_packet_count, max_burst + 1) - 1;
+}
+
+/*
+ * Returns the number of packets in the last "burst" of packets. This field is
+ * valid for all speeds of devices. USB 2.0 devices can only do one "burst", so
+ * the last burst packet count is equal to the total number of packets in the
+ * TD. SuperSpeed endpoints can have up to 3 bursts. All but the last burst
+ * must contain (bMaxBurst + 1) number of packets, but the last burst can
+ * contain 1 to (bMaxBurst + 1) packets.
+ */
+static unsigned int usbssp_get_last_burst_packet_count(
+ struct usbssp_udc *usbssp_data,
+ struct usbssp_request *req_priv,
+ unsigned int total_packet_count)
+{
+ unsigned int max_burst;
+ unsigned int residue;
+
+ if (usbssp_data->gadget.speed >= USB_SPEED_SUPER) {
+ /* bMaxBurst is zero based: 0 means 1 packet per burst */
+ max_burst = req_priv->dep->endpoint.comp_desc->bMaxBurst;
+ residue = total_packet_count % (max_burst + 1);
+ /* If residue is zero, the last burst contains (max_burst + 1)
+ * number of packets, but the TLBPC field is zero-based.
+ */
+ if (residue == 0)
+ return max_burst;
+ return residue - 1;
+ }
+ if (total_packet_count == 0)
+ return 0;
+ return total_packet_count - 1;
+}
+
+/*
+ * Calculates Frame ID field of the isochronous TRB identifies the
+ * target frame that the Interval associated with this Isochronous
+ * Transfer Descriptor will start on.
+ *
+ * Returns actual frame id on success, negative value on error.
+ */
+static int usbssp_get_isoc_frame_id(struct usbssp_udc *usbssp_data,
+ struct usbssp_request *req_priv, int index)
+{
+ int start_frame = 0, ist, ret = 0;
+ int start_frame_id, end_frame_id, current_frame_id;
+
+ /* Isochronous Scheduling Threshold (IST, bits 0~3 in HCSPARAMS2):
+ *
+ * If bit [3] of IST is cleared to '0', software can add a TRB no
+ * later than IST[2:0] Microframes before that TRB is scheduled to
+ * be executed.
+ * If bit [3] of IST is set to '1', software can add a TRB no later
+ * than IST[2:0] Frames before that TRB is scheduled to be executed.
+ */
+ ist = HCS_IST(usbssp_data->hcs_params2) & 0x7;
+ if (HCS_IST(usbssp_data->hcs_params2) & (1 << 3))
+ ist <<= 3;
+
+ /* Software shall not schedule an Isoch TD with a Frame ID value that
+ * is less than the Start Frame ID or greater than the End Frame ID,
+ * where:
+ *
+ * End Frame ID = (Current MFINDEX register value + 895 ms.) MOD 2048
+ * Start Frame ID = (Current MFINDEX register value + IST + 1) MOD 2048
+ *
+ * Both the End Frame ID and Start Frame ID values are calculated
+ * in microframes. When software determines the valid Frame ID value;
+ * The End Frame ID value should be rounded down to the nearest Frame
+ * boundary, and the Start Frame ID value should be rounded up to the
+ * nearest Frame boundary.
+ */
+ current_frame_id = readl(&usbssp_data->run_regs->microframe_index);
+ start_frame_id = roundup(current_frame_id + ist + 1, 8);
+ end_frame_id = rounddown(current_frame_id + 895 * 8, 8);
+
+ start_frame &= 0x7ff;
+ start_frame_id = (start_frame_id >> 3) & 0x7ff;
+ end_frame_id = (end_frame_id >> 3) & 0x7ff;
+
+ usbssp_dbg(usbssp_data, "%s: index %d, reg 0x%x start_frame_id 0x%x,"
+ "end_frame_id 0x%x, start_frame 0x%x\n",
+ __func__, index,
+ readl(&usbssp_data->run_regs->microframe_index),
+ start_frame_id, end_frame_id, start_frame);
+
+ if (start_frame_id < end_frame_id) {
+ if (start_frame > end_frame_id || start_frame < start_frame_id)
+ ret = -EINVAL;
+ } else if (start_frame_id > end_frame_id) {
+ if (start_frame > end_frame_id && start_frame < start_frame_id)
+ ret = -EINVAL;
+ } else {
+ ret = -EINVAL;
+ }
+
+ if (index == 0) {
+ if (ret == -EINVAL || start_frame == start_frame_id) {
+ start_frame = start_frame_id + 1;
+ if (usbssp_data->gadget.speed == USB_SPEED_LOW ||
+ usbssp_data->gadget.speed == USB_SPEED_FULL)
+ req_priv->start_frame = start_frame;
+ else
+ req_priv->start_frame = start_frame << 3;
+ ret = 0;
+ }
+ }
+
+ if (ret) {
+ usbssp_warn(usbssp_data,
+ "Frame ID %d (reg %d, index %d) beyond range (%d, %d)\n",
+ start_frame, current_frame_id, index,
+ start_frame_id, end_frame_id);
+ usbssp_warn(usbssp_data,
+ "Ignore frame ID field, use SIA bit instead\n");
+ return ret;
+ }
+
+ return start_frame;
+}
+
+/* This is for isoc transfer */
+static int usbssp_queue_isoc_tx(struct usbssp_udc *usbssp_data,
+ gfp_t mem_flags,
+ struct usbssp_request *req_priv,
+ unsigned int ep_index)
+{
+ struct usbssp_ring *ep_ring;
+ struct usbssp_td *td;
+ int num_tds, trbs_per_td;
+ struct usbssp_generic_trb *start_trb;
+ bool first_trb;
+ int start_cycle;
+ u32 field, length_field;
+ int running_total, trb_buff_len, td_len, td_remain_len, ret;
+ u64 start_addr, addr;
+ int i, j;
+ bool more_trbs_coming;
+ struct usbssp_ep *ep_priv;
+ int frame_id;
+
+ ep_priv = &usbssp_data->devs.eps[ep_index];
+ ep_ring = usbssp_data->devs.eps[ep_index].ring;
+
+ num_tds = 1;
+
+ if (num_tds < 1) {
+ usbssp_dbg(usbssp_data, "Isoc request with zero packets?\n");
+ return -EINVAL;
+ }
+ start_addr = (u64) req_priv->request.dma;
+ start_trb = &ep_ring->enqueue->generic;
+ start_cycle = ep_ring->cycle_state;
+
+
+ /* Queue the TRBs for each TD, even if they are zero-length */
+ for (i = 0; i < num_tds; i++) {
+ unsigned int total_pkt_count, max_pkt;
+ unsigned int burst_count, last_burst_pkt_count;
+ u32 sia_frame_id;
+
+ first_trb = true;
+ running_total = 0;
+ addr = start_addr;
+ td_len = req_priv->request.length;
+ td_remain_len = td_len;
+ max_pkt = GET_MAX_PACKET(usb_endpoint_maxp(req_priv->dep->endpoint.desc));
+ total_pkt_count = DIV_ROUND_UP(td_len, max_pkt);
+
+ /* A zero-length transfer still involves at least one packet. */
+ if (total_pkt_count == 0)
+ total_pkt_count++;
+ burst_count = usbssp_get_burst_count(usbssp_data, req_priv,
+ total_pkt_count);
+ last_burst_pkt_count = usbssp_get_last_burst_packet_count(
+ usbssp_data, req_priv, total_pkt_count);
+
+ trbs_per_td = count_isoc_trbs_needed(req_priv);
+
+ ret = prepare_transfer(usbssp_data, &usbssp_data->devs,
+ ep_index, req_priv->request.stream_id,
+ trbs_per_td, req_priv, i, mem_flags);
+ if (ret < 0) {
+ if (i == 0)
+ return ret;
+ goto cleanup;
+ }
+ td = &req_priv->td[i];
+
+ /* use SIA as default, if frame id is used overwrite it */
+ sia_frame_id = TRB_SIA;
+ if (HCC_CFC(usbssp_data->hcc_params)) {
+ frame_id = usbssp_get_isoc_frame_id(usbssp_data,
+ req_priv, i);
+ if (frame_id >= 0)
+ sia_frame_id = TRB_FRAME_ID(frame_id);
+ }
+ /*
+ * Set isoc specific data for the first TRB in a TD.
+ * Prevent HW from getting the TRBs by keeping the cycle state
+ * inverted in the first TDs isoc TRB.
+ */
+ field = TRB_TYPE(TRB_ISOC) |
+ TRB_TLBPC(last_burst_pkt_count) |
+ sia_frame_id |
+ (i ? ep_ring->cycle_state : !start_cycle);
+
+ if (!ep_priv->use_extended_tbc)
+ field |= TRB_TBC(burst_count);
+
+ /* fill the rest of the TRB fields, and remaining normal TRBs */
+ for (j = 0; j < trbs_per_td; j++) {
+ u32 remainder = 0;
+
+ /* only first TRB is isoc, overwrite otherwise */
+ if (!first_trb)
+ field = TRB_TYPE(TRB_NORMAL) |
+ ep_ring->cycle_state;
+
+ /* Only set interrupt on short packet for IN EPs */
+ if (usb_endpoint_dir_out(req_priv->dep->endpoint.desc))
+ field |= TRB_ISP;
+
+ /* Set the chain bit for all except the last TRB */
+ if (j < trbs_per_td - 1) {
+ more_trbs_coming = true;
+ field |= TRB_CHAIN;
+ } else {
+ more_trbs_coming = false;
+ td->last_trb = ep_ring->enqueue;
+ field |= TRB_IOC;
+ /* set BEI, except for the last TD */
+ if (i < num_tds - 1)
+ field |= TRB_BEI;
+ }
+ /* Calculate TRB length */
+ trb_buff_len = TRB_BUFF_LEN_UP_TO_BOUNDARY(addr);
+ if (trb_buff_len > td_remain_len)
+ trb_buff_len = td_remain_len;
+
+ /* Set the TRB length, TD size, & interrupter fields. */
+ remainder = usbssp_td_remainder(usbssp_data,
+ running_total, trb_buff_len, td_len,
+ req_priv, more_trbs_coming);
+
+ length_field = TRB_LEN(trb_buff_len) |
+ TRB_INTR_TARGET(0);
+
+ if (first_trb && ep_priv->use_extended_tbc)
+ length_field |= TRB_TD_SIZE_TBC(burst_count);
+ else
+ length_field |= TRB_TD_SIZE(remainder);
+ first_trb = false;
+
+ queue_trb(usbssp_data, ep_ring, more_trbs_coming,
+ lower_32_bits(addr),
+ upper_32_bits(addr),
+ length_field,
+ field);
+ running_total += trb_buff_len;
+
+ addr += trb_buff_len;
+ td_remain_len -= trb_buff_len;
+ }
+
+ /* Check TD length */
+ if (running_total != td_len) {
+ usbssp_err(usbssp_data, "ISOC TD length unmatch\n");
+ ret = -EINVAL;
+ goto cleanup;
+ }
+ }
+
+ /* store the next frame id */
+// if (HCC_CFC(usbssp_data->hcc_params))
+// ep_priv->next_frame_id = req_priv->start_frame + num_tds *
+// req_priv->request.interval;
+
+ giveback_first_trb(usbssp_data, ep_index, req_priv->request.stream_id,
+ start_cycle, start_trb);
+ return 0;
+cleanup:
+ /* Clean up a partially enqueued isoc transfer. */
+
+ for (i--; i >= 0; i--)
+ list_del_init(&req_priv->td[i].td_list);
+
+ /* Use the first TD as a temporary variable to turn the TDs we've queued
+ * into No-ops with a software-owned cycle bit. That way the hardware
+ * won't accidentally start executing bogus TDs when we partially
+ * overwrite them. td->first_trb and td->start_seg are already set.
+ */
+ req_priv->td[0].last_trb = ep_ring->enqueue;
+ /* Every TRB except the first & last will have its cycle bit flipped. */
+ td_to_noop(usbssp_data, ep_ring, &req_priv->td[0], true);
+
+ /* Reset the ring enqueue back to the first TRB and its cycle bit. */
+ ep_ring->enqueue = req_priv->td[0].first_trb;
+ ep_ring->enq_seg = req_priv->td[0].start_seg;
+ ep_ring->cycle_state = start_cycle;
+ ep_ring->num_trbs_free = ep_ring->num_trbs_free_temp;
+ return ret;
+}
+
+int usbssp_queue_isoc_tx_prepare(struct usbssp_udc *usbssp_data,
+ gfp_t mem_flags,
+ struct usbssp_request *req_priv,
+ unsigned int ep_index)
+{
+ struct usbssp_device *dev_priv;
+ struct usbssp_ring *ep_ring;
+ struct usbssp_ep_ctx *ep_ctx;
+ int start_frame;
+ int num_trbs;
+ int ret;
+ struct usbssp_ep *ep_priv;
+ int ist;
+
+ dev_priv = &usbssp_data->devs;
+ ep_priv = &usbssp_data->devs.eps[ep_index];
+ ep_ring = usbssp_data->devs.eps[ep_index].ring;
+ ep_ctx = usbssp_get_ep_ctx(usbssp_data, dev_priv->out_ctx, ep_index);
+
+ /*Single usb_request can use only one TD, Linux gadget drivers doesn't
+ * use sg for isoc so sg will be omitted
+ */
+ num_trbs = count_isoc_trbs_needed(req_priv);
+
+
+ /* Check the ring to guarantee there is enough room for the whole
+ * request. Do not insert any td of the USB Request to the ring if the
+ * check failed.
+ */
+ ret = prepare_ring(usbssp_data, ep_ring, GET_EP_CTX_STATE(ep_ctx),
+ num_trbs, mem_flags);
+ if (ret)
+ return ret;
+
+ if (HCC_CFC(usbssp_data->hcc_params) && !list_empty(&ep_ring->td_list)) {
+ if ((le32_to_cpu(ep_ctx->ep_info) & EP_STATE_MASK) ==
+ EP_STATE_RUNNING) {
+ req_priv->start_frame = ep_priv->next_frame_id;
+ goto skip_start_over;
+ }
+ }
+
+ start_frame = readl(&usbssp_data->run_regs->microframe_index);
+ start_frame &= 0x3fff;
+ /*
+ * Round up to the next frame and consider the time before trb really
+ * gets scheduled by hardare.
+ */
+ ist = HCS_IST(usbssp_data->hcs_params2) & 0x7;
+ if (HCS_IST(usbssp_data->hcs_params2) & (1 << 3))
+ ist <<= 3;
+ start_frame += ist + USBSSP_CFC_DELAY;
+ start_frame = roundup(start_frame, 8);
+skip_start_over:
+ ep_ring->num_trbs_free_temp = ep_ring->num_trbs_free;
+
+ return usbssp_queue_isoc_tx(usbssp_data, mem_flags, req_priv, ep_index);
+}
+
+/**** Command Ring Operations ****/
+/* Generic function for queueing a command TRB on the command ring.
+ * Check to make sure there's room on the command ring for one command TRB.
+ * Also check that there's room reserved for commands that must not fail.
+ * If this is a command that must not fail, meaning command_must_succeed = TRUE,
+ * then only check for the number of reserved spots.
+ * Don't decrement usbssp_data->cmd_ring_reserved_trbs after we've queued the
+ * TRB because the command event handler may want to resubmit a failed command.
+ */
+static int queue_command(struct usbssp_udc *usbssp_data,
+ struct usbssp_command *cmd,
+ u32 field1, u32 field2,
+ u32 field3, u32 field4,
+ bool command_must_succeed)
+{
+ int reserved_trbs = usbssp_data->cmd_ring_reserved_trbs;
+ int ret;
+
+ if ((usbssp_data->usbssp_state & USBSSP_STATE_DYING) ||
+ (usbssp_data->usbssp_state & USBSSP_STATE_HALTED)) {
+ usbssp_dbg(usbssp_data,
+ "USBSSP dying or halted, can't queue command\n");
+ return -ESHUTDOWN;
+ }
+
+ if (!command_must_succeed)
+ reserved_trbs++;
+
+ ret = prepare_ring(usbssp_data, usbssp_data->cmd_ring, EP_STATE_RUNNING,
+ reserved_trbs, GFP_ATOMIC);
+ if (ret < 0) {
+ usbssp_err(usbssp_data,
+ "ERR: No room for command on command ring\n");
+ if (command_must_succeed)
+ usbssp_err(usbssp_data,
+ "ERR: Reserved TRB counting for "
+ "unfailable commands failed.\n");
+ return ret;
+ }
+
+ cmd->command_trb = usbssp_data->cmd_ring->enqueue;
+
+ /* if there are no other commands queued we start the timeout timer */
+ if (list_empty(&usbssp_data->cmd_list)) {
+ usbssp_data->current_cmd = cmd;
+ usbssp_mod_cmd_timer(usbssp_data, USBSSP_CMD_DEFAULT_TIMEOUT);
+ }
+
+ list_add_tail(&cmd->cmd_list, &usbssp_data->cmd_list);
+
+ queue_trb(usbssp_data, usbssp_data->cmd_ring, false, field1, field2,
+ field3, field4 | usbssp_data->cmd_ring->cycle_state);
+ return 0;
+}
+
+/* Queue a slot enable or disable request on the command ring */
+int usbssp_queue_slot_control(struct usbssp_udc *usbssp_data,
+ struct usbssp_command *cmd,
+ u32 trb_type)
+{
+ return queue_command(usbssp_data, cmd, 0, 0, 0,
+ TRB_TYPE(trb_type) |
+ SLOT_ID_FOR_TRB(usbssp_data->slot_id), false);
+}
+
+/* Queue an address device command TRB */
+int usbssp_queue_address_device(struct usbssp_udc *usbssp_data,
+ struct usbssp_command *cmd,
+ dma_addr_t in_ctx_ptr,
+ enum usbssp_setup_dev setup)
+{
+ return queue_command(usbssp_data, cmd, lower_32_bits(in_ctx_ptr),
+ upper_32_bits(in_ctx_ptr), 0,
+ TRB_TYPE(TRB_ADDR_DEV) |
+ SLOT_ID_FOR_TRB(usbssp_data->slot_id)
+ | (setup == SETUP_CONTEXT_ONLY ? TRB_BSR : 0), false);
+}
+
+int usbssp_queue_vendor_command(struct usbssp_udc *usbssp_data,
+ struct usbssp_command *cmd,
+ u32 field1, u32 field2, u32 field3, u32 field4)
+{
+ return queue_command(usbssp_data, cmd, field1, field2, field3,
+ field4, false);
+}
+
+/* Queue a reset device command TRB */
+int usbssp_queue_reset_device(struct usbssp_udc *usbssp_data,
+ struct usbssp_command *cmd)
+{
+ return queue_command(usbssp_data, cmd, 0, 0, 0,
+ TRB_TYPE(TRB_RESET_DEV) |
+ SLOT_ID_FOR_TRB(usbssp_data->slot_id),
+ false);
+}
+
+/* Queue a configure endpoint command TRB */
+int usbssp_queue_configure_endpoint(struct usbssp_udc *usbssp_data,
+ struct usbssp_command *cmd,
+ dma_addr_t in_ctx_ptr,
+ bool command_must_succeed)
+{
+ return queue_command(usbssp_data, cmd, lower_32_bits(in_ctx_ptr),
+ upper_32_bits(in_ctx_ptr), 0,
+ TRB_TYPE(TRB_CONFIG_EP) |
+ SLOT_ID_FOR_TRB(usbssp_data->slot_id),
+ command_must_succeed);
+}
+
+/* Queue an evaluate context command TRB */
+int usbssp_queue_evaluate_context(struct usbssp_udc *usbssp_data,
+ struct usbssp_command *cmd,
+ dma_addr_t in_ctx_ptr,
+ bool command_must_succeed)
+{
+ return queue_command(usbssp_data, cmd, lower_32_bits(in_ctx_ptr),
+ upper_32_bits(in_ctx_ptr), 0,
+ TRB_TYPE(TRB_EVAL_CONTEXT) |
+ SLOT_ID_FOR_TRB(usbssp_data->slot_id),
+ command_must_succeed);
+}
+
+/*
+ * Suspend is set to indicate "Stop Endpoint Command" is being issued to stop
+ * activity on an endpoint that is about to be suspended.
+ */
+int usbssp_queue_stop_endpoint(struct usbssp_udc *usbssp_data,
+ struct usbssp_command *cmd,
+ unsigned int ep_index, int suspend)
+{
+ u32 trb_slot_id = SLOT_ID_FOR_TRB(usbssp_data->slot_id);
+ u32 trb_ep_index = EP_ID_FOR_TRB(ep_index);
+ u32 type = TRB_TYPE(TRB_STOP_RING);
+ u32 trb_suspend = SUSPEND_PORT_FOR_TRB(suspend);
+
+ return queue_command(usbssp_data, cmd, 0, 0, 0,
+ trb_slot_id | trb_ep_index | type | trb_suspend, false);
+}
+
+/* Set Transfer Ring Dequeue Pointer command */
+void usbssp_queue_new_dequeue_state(struct usbssp_udc *usbssp_data,
+ unsigned int ep_index,
+ struct usbssp_dequeue_state *deq_state)
+{
+ dma_addr_t addr;
+ u32 trb_slot_id = SLOT_ID_FOR_TRB(usbssp_data->slot_id);
+ u32 trb_ep_index = EP_ID_FOR_TRB(ep_index);
+ u32 trb_stream_id = STREAM_ID_FOR_TRB(deq_state->stream_id);
+ u32 trb_sct = 0;
+ u32 type = TRB_TYPE(TRB_SET_DEQ);
+ struct usbssp_ep *ep_priv;
+ struct usbssp_command *cmd;
+ int ret;
+
+ usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_cancel_request,
+ "Set TR Deq Ptr cmd, new deq seg = %p (0x%llx dma), "
+ "new deq ptr = %p (0x%llx dma), new cycle = %u",
+ deq_state->new_deq_seg,
+ (unsigned long long)deq_state->new_deq_seg->dma,
+ deq_state->new_deq_ptr,
+ (unsigned long long)usbssp_trb_virt_to_dma(
+ deq_state->new_deq_seg, deq_state->new_deq_ptr),
+ deq_state->new_cycle_state);
+
+ addr = usbssp_trb_virt_to_dma(deq_state->new_deq_seg,
+ deq_state->new_deq_ptr);
+ if (addr == 0) {
+ usbssp_warn(usbssp_data, "WARN Cannot submit Set TR Deq Ptr\n");
+ usbssp_warn(usbssp_data, "WARN deq seg = %p, deq pt = %p\n",
+ deq_state->new_deq_seg, deq_state->new_deq_ptr);
+ return;
+ }
+ ep_priv = &usbssp_data->devs.eps[ep_index];
+ if ((ep_priv->ep_state & SET_DEQ_PENDING)) {
+ usbssp_warn(usbssp_data, "WARN Cannot submit Set TR Deq Ptr\n");
+ usbssp_warn(usbssp_data,
+ "A Set TR Deq Ptr command is pending.\n");
+ return;
+ }
+
+ /* This function gets called from contexts where it cannot sleep */
+ cmd = usbssp_alloc_command(usbssp_data, false, GFP_ATOMIC);
+ if (!cmd) {
+ usbssp_warn(usbssp_data,
+ "WARN Cannot submit Set TR Deq Ptr: ENOMEM\n");
+ return;
+ }
+
+ ep_priv->queued_deq_seg = deq_state->new_deq_seg;
+ ep_priv->queued_deq_ptr = deq_state->new_deq_ptr;
+ if (deq_state->stream_id)
+ trb_sct = SCT_FOR_TRB(SCT_PRI_TR);
+ ret = queue_command(usbssp_data, cmd,
+ lower_32_bits(addr) | trb_sct | deq_state->new_cycle_state,
+ upper_32_bits(addr), trb_stream_id,
+ trb_slot_id | trb_ep_index | type, false);
+ if (ret < 0) {
+ usbssp_free_command(usbssp_data, cmd);
+ return;
+ }
+
+ /* Stop the TD queueing code from ringing the doorbell until
+ * this command completes. The DC won't set the dequeue pointer
+ * if the ring is running, and ringing the doorbell starts the
+ * ring running.
+ */
+ ep_priv->ep_state |= SET_DEQ_PENDING;
+}
+
+int usbssp_queue_reset_ep(struct usbssp_udc *usbssp_data,
+ struct usbssp_command *cmd,
+ unsigned int ep_index,
+ enum usbssp_ep_reset_type reset_type)
+{
+ u32 trb_slot_id = SLOT_ID_FOR_TRB(usbssp_data->slot_id);
+ u32 trb_ep_index = EP_ID_FOR_TRB(ep_index);
+ u32 type = TRB_TYPE(TRB_RESET_EP);
+
+ if (reset_type == EP_SOFT_RESET)
+ type |= TRB_TSP;
+
+ return queue_command(usbssp_data, cmd, 0, 0, 0,
+ trb_slot_id | trb_ep_index | type, false);
+}
+
+/*
+ * Queue an NOP command TRB
+ */
+int usbssp_queue_nop(struct usbssp_udc *usbssp_data,
+ struct usbssp_command *cmd)
+{
+ return queue_command(usbssp_data, cmd, 0, 0, 0,
+ TRB_TYPE(TRB_CMD_NOOP), false);
+}
+
+/*
+ * Queue a halt endpoint request on the command ring
+ */
+int usbssp_queue_halt_endpoint(struct usbssp_udc *usbssp_data,
+ struct usbssp_command *cmd,
+ unsigned int ep_index)
+{
+ u32 trb_slot_id = SLOT_ID_FOR_TRB(usbssp_data->slot_id);
+ u32 trb_ep_index = EP_ID_FOR_TRB(ep_index);
+
+ return queue_command(usbssp_data, cmd, 0, 0, 0,
+ TRB_TYPE(TRB_HALT_ENDPOINT) | trb_slot_id |
+ trb_ep_index, false);
+}
--
2.17.1
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