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path: root/drivers/usb/gadget/mv_udc.c
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Diffstat (limited to 'drivers/usb/gadget/mv_udc.c')
-rw-r--r--drivers/usb/gadget/mv_udc.c25
1 files changed, 23 insertions, 2 deletions
diff --git a/drivers/usb/gadget/mv_udc.c b/drivers/usb/gadget/mv_udc.c
index 04787be7e0..dbdf878d93 100644
--- a/drivers/usb/gadget/mv_udc.c
+++ b/drivers/usb/gadget/mv_udc.c
@@ -444,6 +444,7 @@ void udc_disconnect(void)
static int mvudc_probe(void)
{
struct ept_queue_head *head;
+ uint8_t *imem;
int i;
const int num = 2 * NUM_ENDPOINTS;
@@ -453,12 +454,29 @@ static int mvudc_probe(void)
const int eplist_raw_sz = num * sizeof(struct ept_queue_head);
const int eplist_sz = roundup(eplist_raw_sz, ARCH_DMA_MINALIGN);
+ const int ilist_align = roundup(ARCH_DMA_MINALIGN, 32);
+ const int ilist_ent_raw_sz = 2 * sizeof(struct ept_queue_item);
+ const int ilist_ent_sz = roundup(ilist_ent_raw_sz, ARCH_DMA_MINALIGN);
+ const int ilist_sz = NUM_ENDPOINTS * ilist_ent_sz;
+
/* The QH list must be aligned to 4096 bytes. */
controller.epts = memalign(eplist_align, eplist_sz);
if (!controller.epts)
return -ENOMEM;
memset(controller.epts, 0, eplist_sz);
+ /*
+ * Each qTD item must be 32-byte aligned, each qTD touple must be
+ * cacheline aligned. There are two qTD items for each endpoint and
+ * only one of them is used for the endpoint at time, so we can group
+ * them together.
+ */
+ controller.items_mem = memalign(ilist_align, ilist_sz);
+ if (!controller.items_mem) {
+ free(controller.epts);
+ return -ENOMEM;
+ }
+
for (i = 0; i < 2 * NUM_ENDPOINTS; i++) {
/*
* Configure QH for each endpoint. The structure of the QH list
@@ -477,8 +495,11 @@ static int mvudc_probe(void)
head->next = TERMINATE;
head->info = 0;
- controller.items[i] = memalign(roundup(32, ARCH_DMA_MINALIGN),
- sizeof(struct ept_queue_item));
+ imem = controller.items_mem + ((i >> 1) * ilist_ent_sz);
+ if (i & 1)
+ imem += sizeof(struct ept_queue_item);
+
+ controller.items[i] = (struct ept_queue_item *)imem;
}
INIT_LIST_HEAD(&controller.gadget.ep_list);