usb: mv_udc: Improve allocation of qTD items

Allocate the qTD items all at once instead of allocating them
separately. Moreover, make sure each qTD is properly aligned
to 32-bytes boundary and that cache can be safely flushed over
each qTD touple.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
Cc: Lei Wen <leiwen@marvell.com>
Cc: Otavio Salvador <otavio@ossystems.com.br>
Cc: Stefano Babic <sbabic@denx.de>

diff --git a/drivers/usb/gadget/mv_udc.c b/drivers/usb/gadget/mv_udc.c
index 04787be..dbdf878 100644 (file)
--- 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);

diff --git a/include/usb/mv_udc.h b/include/usb/mv_udc.h
index a9869f0..c1761b0 100644 (file)
--- a/include/usb/mv_udc.h
+++ b/include/usb/mv_udc.h
@@ -77,6 +77,7 @@ struct mv_drv {
        struct ehci_ctrl                *ctrl;
        struct ept_queue_head           *epts;
        struct ept_queue_item           *items[2 * NUM_ENDPOINTS];
+       uint8_t                         *items_mem;
        struct mv_ep                    ep[NUM_ENDPOINTS];
 };