xhci: Remove some unnecessary casts and tidy some endian swap code

Some of the recently-added cpu_to_leXX and leXX_to_cpu made things somewhat
messy; this patch neatens some of these areas, removing unnecessary casts
in those parts also.  In some places (where Y & Z are constants) a
comparison of (leXX_to_cpu(X) & Y) == Z has been replaced with
(X & cpu_to_leXX(Y)) == cpu_to_leXX(Z).  The endian reversal of the
constants should wash out at compile time.

Signed-off-by: Matt Evans <matt@ozlabs.org>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>

5 files changed, 52 insertions, 55 deletions

diff --git a/drivers/usb/host/xhci-dbg.c b/drivers/usb/host/xhci-dbg.c
index 2e0486178dbe..17d3e359ca62 100644
--- a/drivers/usb/host/xhci-dbg.c
+++ b/drivers/usb/host/xhci-dbg.c
@@ -266,11 +266,11 @@ void xhci_debug_trb(struct xhci_hcd *xhci, union xhci_trb *trb)
                 xhci_dbg(xhci, "Interrupter target = 0x%x\n",
                          GET_INTR_TARGET(le32_to_cpu(trb->link.intr_target)));
                 xhci_dbg(xhci, "Cycle bit = %u\n",
-                         (unsigned int) (le32_to_cpu(trb->link.control) & TRB_CYCLE));
+                         le32_to_cpu(trb->link.control) & TRB_CYCLE);
                 xhci_dbg(xhci, "Toggle cycle bit = %u\n",
-                         (unsigned int) (le32_to_cpu(trb->link.control) & LINK_TOGGLE));
+                         le32_to_cpu(trb->link.control) & LINK_TOGGLE);
                 xhci_dbg(xhci, "No Snoop bit = %u\n",
-                         (unsigned int) (le32_to_cpu(trb->link.control) & TRB_NO_SNOOP));
+                         le32_to_cpu(trb->link.control) & TRB_NO_SNOOP);
                 break;
         case TRB_TYPE(TRB_TRANSFER):
                 address = le64_to_cpu(trb->trans_event.buffer);
@@ -284,9 +284,9 @@ void xhci_debug_trb(struct xhci_hcd *xhci, union xhci_trb *trb)
                 address = le64_to_cpu(trb->event_cmd.cmd_trb);
                 xhci_dbg(xhci, "Command TRB pointer = %llu\n", address);
                 xhci_dbg(xhci, "Completion status = %u\n",
-                         (unsigned int) GET_COMP_CODE(le32_to_cpu(trb->event_cmd.status)));
+                         GET_COMP_CODE(le32_to_cpu(trb->event_cmd.status)));
                 xhci_dbg(xhci, "Flags = 0x%x\n",
-                         (unsigned int) le32_to_cpu(trb->event_cmd.flags));
+                         le32_to_cpu(trb->event_cmd.flags));
                 break;
         default:
                 xhci_dbg(xhci, "Unknown TRB with TRB type ID %u\n",
@@ -318,10 +318,10 @@ void xhci_debug_segment(struct xhci_hcd *xhci, struct xhci_segment *seg)
         for (i = 0; i < TRBS_PER_SEGMENT; ++i) {
                 trb = &seg->trbs[i];
                 xhci_dbg(xhci, "@%016llx %08x %08x %08x %08x\n", addr,
-                         (u32)lower_32_bits(le64_to_cpu(trb->link.segment_ptr)),
-                         (u32)upper_32_bits(le64_to_cpu(trb->link.segment_ptr)),
-                         (unsigned int) le32_to_cpu(trb->link.intr_target),
-                         (unsigned int) le32_to_cpu(trb->link.control));
+                         lower_32_bits(le64_to_cpu(trb->link.segment_ptr)),
+                         upper_32_bits(le64_to_cpu(trb->link.segment_ptr)),
+                         le32_to_cpu(trb->link.intr_target),
+                         le32_to_cpu(trb->link.control));
                 addr += sizeof(*trb);
         }
 }
@@ -402,8 +402,8 @@ void xhci_dbg_erst(struct xhci_hcd *xhci, struct xhci_erst *erst)
                          addr,
                          lower_32_bits(le64_to_cpu(entry->seg_addr)),
                          upper_32_bits(le64_to_cpu(entry->seg_addr)),
-                         (unsigned int) le32_to_cpu(entry->seg_size),
-                         (unsigned int) le32_to_cpu(entry->rsvd));
+                         le32_to_cpu(entry->seg_size),
+                         le32_to_cpu(entry->rsvd));
                 addr += sizeof(*entry);
         }
 }
diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index 26caba4c1950..596d8fbb9e18 100644
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -89,8 +89,8 @@ static void xhci_link_segments(struct xhci_hcd *xhci, struct xhci_segment *prev,
                 return;
         prev->next = next;
         if (link_trbs) {
-                prev->trbs[TRBS_PER_SEGMENT-1].link.
-                        segment_ptr = cpu_to_le64(next->dma);
+                prev->trbs[TRBS_PER_SEGMENT-1].link.segment_ptr =
+                        cpu_to_le64(next->dma);
 
                 /* Set the last TRB in the segment to have a TRB type ID of Link TRB */
                 val = le32_to_cpu(prev->trbs[TRBS_PER_SEGMENT-1].link.control);
@@ -187,8 +187,8 @@ static struct xhci_ring *xhci_ring_alloc(struct xhci_hcd *xhci,
 
         if (link_trbs) {
                 /* See section 4.9.2.1 and 6.4.4.1 */
-                prev->trbs[TRBS_PER_SEGMENT-1].link.
-                        control |= cpu_to_le32(LINK_TOGGLE);
+                prev->trbs[TRBS_PER_SEGMENT-1].link.control |=
+                        cpu_to_le32(LINK_TOGGLE);
                 xhci_dbg(xhci, "Wrote link toggle flag to"
                                 " segment %p (virtual), 0x%llx (DMA)\n",
                                 prev, (unsigned long long)prev->dma);
@@ -549,8 +549,8 @@ struct xhci_stream_info *xhci_alloc_stream_info(struct xhci_hcd *xhci,
                 addr = cur_ring->first_seg->dma |
                         SCT_FOR_CTX(SCT_PRI_TR) |
                         cur_ring->cycle_state;
-                stream_info->stream_ctx_array[cur_stream].
-                        stream_ring = cpu_to_le64(addr);
+                stream_info->stream_ctx_array[cur_stream].stream_ring =
+                        cpu_to_le64(addr);
                 xhci_dbg(xhci, "Setting stream %d ring ptr to 0x%08llx\n",
                                 cur_stream, (unsigned long long) addr);
 
@@ -786,7 +786,7 @@ int xhci_alloc_virt_device(struct xhci_hcd *xhci, int slot_id,
         xhci_dbg(xhci, "Set slot id %d dcbaa entry %p to 0x%llx\n",
                  slot_id,
                  &xhci->dcbaa->dev_context_ptrs[slot_id],
-                 (unsigned long long) le64_to_cpu(xhci->dcbaa->dev_context_ptrs[slot_id]));
+                 le64_to_cpu(xhci->dcbaa->dev_context_ptrs[slot_id]));
 
         return 1;
 fail:
@@ -890,19 +890,19 @@ int xhci_setup_addressable_virt_dev(struct xhci_hcd *xhci, struct usb_device *ud
         ctrl_ctx->add_flags = cpu_to_le32(SLOT_FLAG | EP0_FLAG);
 
         /* 3) Only the control endpoint is valid - one endpoint context */
-        slot_ctx->dev_info |= cpu_to_le32(LAST_CTX(1) | (u32) udev->route);
+        slot_ctx->dev_info |= cpu_to_le32(LAST_CTX(1) | udev->route);
         switch (udev->speed) {
         case USB_SPEED_SUPER:
-                slot_ctx->dev_info |= cpu_to_le32((u32) SLOT_SPEED_SS);
+                slot_ctx->dev_info |= cpu_to_le32(SLOT_SPEED_SS);
                 break;
         case USB_SPEED_HIGH:
-                slot_ctx->dev_info |= cpu_to_le32((u32) SLOT_SPEED_HS);
+                slot_ctx->dev_info |= cpu_to_le32(SLOT_SPEED_HS);
                 break;
         case USB_SPEED_FULL:
-                slot_ctx->dev_info |= cpu_to_le32((u32) SLOT_SPEED_FS);
+                slot_ctx->dev_info |= cpu_to_le32(SLOT_SPEED_FS);
                 break;
         case USB_SPEED_LOW:
-                slot_ctx->dev_info |= cpu_to_le32((u32) SLOT_SPEED_LS);
+                slot_ctx->dev_info |= cpu_to_le32(SLOT_SPEED_LS);
                 break;
         case USB_SPEED_WIRELESS:
                 xhci_dbg(xhci, "FIXME xHCI doesn't support wireless speeds\n");
@@ -916,7 +916,7 @@ int xhci_setup_addressable_virt_dev(struct xhci_hcd *xhci, struct usb_device *ud
         port_num = xhci_find_real_port_number(xhci, udev);
         if (!port_num)
                 return -EINVAL;
-        slot_ctx->dev_info2 |= cpu_to_le32((u32) ROOT_HUB_PORT(port_num));
+        slot_ctx->dev_info2 |= cpu_to_le32(ROOT_HUB_PORT(port_num));
         /* Set the port number in the virtual_device to the faked port number */
         for (top_dev = udev; top_dev->parent && top_dev->parent->parent;
                         top_dev = top_dev->parent)
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index cc1485bfed38..4b40e4c95f94 100644
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -113,15 +113,13 @@ static int last_trb(struct xhci_hcd *xhci, struct xhci_ring *ring,
         if (ring == xhci->event_ring)
                 return trb == &seg->trbs[TRBS_PER_SEGMENT];
         else
-                return (le32_to_cpu(trb->link.control) & TRB_TYPE_BITMASK)
-                        == TRB_TYPE(TRB_LINK);
+                return TRB_TYPE_LINK_LE32(trb->link.control);
 }
 
 static int enqueue_is_link_trb(struct xhci_ring *ring)
 {
         struct xhci_link_trb *link = &ring->enqueue->link;
-        return ((le32_to_cpu(link->control) & TRB_TYPE_BITMASK) ==
-                TRB_TYPE(TRB_LINK));
+        return TRB_TYPE_LINK_LE32(link->control);
 }
 
 /* Updates trb to point to the next TRB in the ring, and updates seg if the next
@@ -372,7 +370,7 @@ static struct xhci_segment *find_trb_seg(
         while (cur_seg->trbs > trb ||
                         &cur_seg->trbs[TRBS_PER_SEGMENT - 1] < trb) {
                 generic_trb = &cur_seg->trbs[TRBS_PER_SEGMENT - 1].generic;
-                if (le32_to_cpu(generic_trb->field[3]) & LINK_TOGGLE)
+                if (generic_trb->field[3] & cpu_to_le32(LINK_TOGGLE))
                         *cycle_state ^= 0x1;
                 cur_seg = cur_seg->next;
                 if (cur_seg == start_seg)
@@ -489,8 +487,8 @@ void xhci_find_new_dequeue_state(struct xhci_hcd *xhci,
         }
 
         trb = &state->new_deq_ptr->generic;
-        if ((le32_to_cpu(trb->field[3]) & TRB_TYPE_BITMASK) ==
-            TRB_TYPE(TRB_LINK) && (le32_to_cpu(trb->field[3]) & LINK_TOGGLE))
+        if (TRB_TYPE_LINK_LE32(trb->field[3]) &&
+            (trb->field[3] & cpu_to_le32(LINK_TOGGLE)))
                 state->new_cycle_state ^= 0x1;
         next_trb(xhci, ep_ring, &state->new_deq_seg, &state->new_deq_ptr);
 
@@ -525,8 +523,7 @@ static void td_to_noop(struct xhci_hcd *xhci, struct xhci_ring *ep_ring,
         for (cur_seg = cur_td->start_seg, cur_trb = cur_td->first_trb;
                         true;
                         next_trb(xhci, ep_ring, &cur_seg, &cur_trb)) {
-                if ((le32_to_cpu(cur_trb->generic.field[3]) & TRB_TYPE_BITMASK)
-                    == TRB_TYPE(TRB_LINK)) {
+                if (TRB_TYPE_LINK_LE32(cur_trb->generic.field[3])) {
                         /* Unchain any chained Link TRBs, but
                          * leave the pointers intact.
                          */
@@ -1000,7 +997,7 @@ static void handle_reset_ep_completion(struct xhci_hcd *xhci,
          * but we don't care.
          */
         xhci_dbg(xhci, "Ignoring reset ep completion code of %u\n",
-                 (unsigned int) GET_COMP_CODE(le32_to_cpu(event->status)));
+                 GET_COMP_CODE(le32_to_cpu(event->status)));
 
         /* HW with the reset endpoint quirk needs to have a configure endpoint
          * command complete before the endpoint can be used.  Queue that here
@@ -1458,7 +1455,8 @@ static int xhci_requires_manual_halt_cleanup(struct xhci_hcd *xhci,
                  * endpoint anyway.  Check if a babble halted the
                  * endpoint.
                  */
-                if ((le32_to_cpu(ep_ctx->ep_info) & EP_STATE_MASK) == EP_STATE_HALTED)
+                if ((ep_ctx->ep_info & cpu_to_le32(EP_STATE_MASK)) ==
+                    cpu_to_le32(EP_STATE_HALTED))
                         return 1;
 
         return 0;
@@ -1752,10 +1750,8 @@ static int process_isoc_td(struct xhci_hcd *xhci, struct xhci_td *td,
                 for (cur_trb = ep_ring->dequeue,
                      cur_seg = ep_ring->deq_seg; cur_trb != event_trb;
                      next_trb(xhci, ep_ring, &cur_seg, &cur_trb)) {
-                        if ((le32_to_cpu(cur_trb->generic.field[3]) &
-                         TRB_TYPE_BITMASK) != TRB_TYPE(TRB_TR_NOOP) &&
-                            (le32_to_cpu(cur_trb->generic.field[3]) &
-                         TRB_TYPE_BITMASK) != TRB_TYPE(TRB_LINK))
+                        if (!TRB_TYPE_NOOP_LE32(cur_trb->generic.field[3]) &&
+                            !TRB_TYPE_LINK_LE32(cur_trb->generic.field[3]))
                                 len += TRB_LEN(le32_to_cpu(cur_trb->generic.field[2]));
                 }
                 len += TRB_LEN(le32_to_cpu(cur_trb->generic.field[2])) -
@@ -1888,10 +1884,8 @@ static int process_bulk_intr_td(struct xhci_hcd *xhci, struct xhci_td *td,
                 for (cur_trb = ep_ring->dequeue, cur_seg = ep_ring->deq_seg;
                                 cur_trb != event_trb;
                                 next_trb(xhci, ep_ring, &cur_seg, &cur_trb)) {
-                        if ((le32_to_cpu(cur_trb->generic.field[3]) &
-                         TRB_TYPE_BITMASK) != TRB_TYPE(TRB_TR_NOOP) &&
-                            (le32_to_cpu(cur_trb->generic.field[3]) &
-                         TRB_TYPE_BITMASK) != TRB_TYPE(TRB_LINK))
+                        if (!TRB_TYPE_NOOP_LE32(cur_trb->generic.field[3]) &&
+                            !TRB_TYPE_LINK_LE32(cur_trb->generic.field[3]))
                                 td->urb->actual_length +=
                                         TRB_LEN(le32_to_cpu(cur_trb->generic.field[2]));
                 }
@@ -2046,8 +2040,8 @@ static int handle_tx_event(struct xhci_hcd *xhci,
                                   TRB_TO_SLOT_ID(le32_to_cpu(event->flags)),
                                   ep_index);
                         xhci_dbg(xhci, "Event TRB with TRB type ID %u\n",
-                                 (unsigned int) (le32_to_cpu(event->flags)
-                                                 & TRB_TYPE_BITMASK)>>10);
+                                 (le32_to_cpu(event->flags) &
+                                  TRB_TYPE_BITMASK)>>10);
                         xhci_print_trb_offsets(xhci, (union xhci_trb *) event);
                         if (ep->skip) {
                                 ep->skip = false;
@@ -2104,9 +2098,7 @@ static int handle_tx_event(struct xhci_hcd *xhci,
                  * corresponding TD has been cancelled. Just ignore
                  * the TD.
                  */
-                if ((le32_to_cpu(event_trb->generic.field[3])
-                             & TRB_TYPE_BITMASK)
-                                 == TRB_TYPE(TRB_TR_NOOP)) {
+                if (TRB_TYPE_NOOP_LE32(event_trb->generic.field[3])) {
                         xhci_dbg(xhci,
                                  "event_trb is a no-op TRB. Skip it\n");
                         goto cleanup;
@@ -2432,7 +2424,7 @@ static int prepare_ring(struct xhci_hcd *xhci, struct xhci_ring *ep_ring,
                                 next->link.control |= cpu_to_le32(TRB_CHAIN);
 
                         wmb();
-                        next->link.control ^= cpu_to_le32((u32) TRB_CYCLE);
+                        next->link.control ^= cpu_to_le32(TRB_CYCLE);
 
                         /* Toggle the cycle bit after the last ring segment. */
                         if (last_trb_on_last_seg(xhci, ring, ring->enq_seg, next)) {
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index d9660eb97eb9..743cf80debb1 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -1333,8 +1333,8 @@ int xhci_drop_endpoint(struct usb_hcd *hcd, struct usb_device *udev,
         /* If the HC already knows the endpoint is disabled,
          * or the HCD has noted it is disabled, ignore this request
          */
-        if ((le32_to_cpu(ep_ctx->ep_info) & EP_STATE_MASK) ==
-            EP_STATE_DISABLED ||
+        if (((ep_ctx->ep_info & cpu_to_le32(EP_STATE_MASK)) ==
+             cpu_to_le32(EP_STATE_DISABLED)) ||
             le32_to_cpu(ctrl_ctx->drop_flags) &
             xhci_get_endpoint_flag(&ep->desc)) {
                 xhci_warn(xhci, "xHCI %s called with disabled ep %p\n",
@@ -1725,8 +1725,7 @@ static int xhci_configure_endpoint(struct xhci_hcd *xhci,
                 /* Enqueue pointer can be left pointing to the link TRB,
                  * we must handle that
                  */
-                if ((le32_to_cpu(command->command_trb->link.control)
-                     & TRB_TYPE_BITMASK) == TRB_TYPE(TRB_LINK))
+                if (TRB_TYPE_LINK_LE32(command->command_trb->link.control))
                         command->command_trb =
                                 xhci->cmd_ring->enq_seg->next->trbs;
 
@@ -2519,8 +2518,7 @@ int xhci_discover_or_reset_device(struct usb_hcd *hcd, struct usb_device *udev)
         /* Enqueue pointer can be left pointing to the link TRB,
          * we must handle that
          */
-        if ((le32_to_cpu(reset_device_cmd->command_trb->link.control)
-             & TRB_TYPE_BITMASK) == TRB_TYPE(TRB_LINK))
+        if (TRB_TYPE_LINK_LE32(reset_device_cmd->command_trb->link.control))
                 reset_device_cmd->command_trb =
                         xhci->cmd_ring->enq_seg->next->trbs;
 
diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
index ac0196e7fcf1..f9098a24d38b 100644
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -1065,6 +1065,13 @@ union xhci_trb {
 /* Get NEC firmware revision. */
 #define TRB_NEC_GET_FW          49
 
+#define TRB_TYPE_LINK(x)        (((x) & TRB_TYPE_BITMASK) == TRB_TYPE(TRB_LINK))
+/* Above, but for __le32 types -- can avoid work by swapping constants: */
+#define TRB_TYPE_LINK_LE32(x)   (((x) & cpu_to_le32(TRB_TYPE_BITMASK)) == \
+                                 cpu_to_le32(TRB_TYPE(TRB_LINK)))
+#define TRB_TYPE_NOOP_LE32(x)   (((x) & cpu_to_le32(TRB_TYPE_BITMASK)) == \
+                                 cpu_to_le32(TRB_TYPE(TRB_TR_NOOP)))
+
 #define NEC_FW_MINOR(p)         (((p) >> 0) & 0xff)
 #define NEC_FW_MAJOR(p)         (((p) >> 8) & 0xff)