ci_udc: Update the ci_udc driver to support bulk transfers
Update the ci_udc driver to support bulk transfer
and also added capability of having multiple dtds
if requested data is more than 16K.
These changes are tested for both the DFU and lthor.
Signed-off-by: Siva Durga Prasad Paladugu <sivadur@xilinx.com>
diff --git a/drivers/usb/gadget/ci_udc.c b/drivers/usb/gadget/ci_udc.c
index 22d288c..aadff42 100644
--- a/drivers/usb/gadget/ci_udc.c
+++ b/drivers/usb/gadget/ci_udc.c
@@ -50,6 +50,8 @@
/* For each endpoint, we need 2 QTDs, one for each of IN and OUT */
#define ILIST_SZ (NUM_ENDPOINTS * 2 * ILIST_ENT_SZ)
+#define EP_MAX_LENGTH_TRANSFER 0x4000
+
#ifndef DEBUG
#define DBG(x...) do {} while (0)
#else
@@ -102,13 +104,28 @@
};
/* Init values for USB endpoints. */
-static const struct usb_ep ci_ep_init[2] = {
+static const struct usb_ep ci_ep_init[5] = {
[0] = { /* EP 0 */
.maxpacket = 64,
.name = "ep0",
.ops = &ci_ep_ops,
},
- [1] = { /* EP 1..n */
+ [1] = {
+ .maxpacket = 512,
+ .name = "ep1in-bulk",
+ .ops = &ci_ep_ops,
+ },
+ [2] = {
+ .maxpacket = 512,
+ .name = "ep2out-bulk",
+ .ops = &ci_ep_ops,
+ },
+ [3] = {
+ .maxpacket = 512,
+ .name = "ep3in-int",
+ .ops = &ci_ep_ops,
+ },
+ [4] = {
.maxpacket = 512,
.name = "ep-",
.ops = &ci_ep_ops,
@@ -197,6 +214,19 @@
}
/**
+ * ci_flush_td - flush cache over queue item
+ * @td: td pointer
+ *
+ * This function flushes cache for particular transfer descriptor.
+ */
+static void ci_flush_td(struct ept_queue_item *td)
+{
+ const uint32_t start = (uint32_t)td;
+ const uint32_t end = (uint32_t) td + ILIST_ENT_SZ;
+ flush_dcache_range(start, end);
+}
+
+/**
* ci_invalidate_qtd - invalidate cache over queue item
* @ep_num: Endpoint number
*
@@ -211,6 +241,19 @@
invalidate_dcache_range(start, end);
}
+/**
+ * ci_invalidate_td - invalidate cache over queue item
+ * @td: td pointer
+ *
+ * This function invalidates cache for particular transfer descriptor.
+ */
+static void ci_invalidate_td(struct ept_queue_item *td)
+{
+ const uint32_t start = (uint32_t)td;
+ const uint32_t end = start + ILIST_ENT_SZ;
+ invalidate_dcache_range(start, end);
+}
+
static struct usb_request *
ci_ep_alloc_request(struct usb_ep *ep, unsigned int gfp_flags)
{
@@ -376,6 +419,9 @@
struct ept_queue_head *head;
int bit, num, len, in;
struct ci_req *ci_req;
+ u8 *buf;
+ uint32_t length, actlen;
+ struct ept_queue_item *dtd, *qtd;
ci_ep->req_primed = true;
@@ -387,16 +433,41 @@
ci_req = list_first_entry(&ci_ep->queue, struct ci_req, queue);
len = ci_req->req.length;
- item->info = INFO_BYTES(len) | INFO_ACTIVE;
- item->page0 = (unsigned long)ci_req->hw_buf;
- item->page1 = ((unsigned long)ci_req->hw_buf & 0xfffff000) + 0x1000;
- item->page2 = ((unsigned long)ci_req->hw_buf & 0xfffff000) + 0x2000;
- item->page3 = ((unsigned long)ci_req->hw_buf & 0xfffff000) + 0x3000;
- item->page4 = ((unsigned long)ci_req->hw_buf & 0xfffff000) + 0x4000;
-
head->next = (unsigned long)item;
head->info = 0;
+ ci_req->dtd_count = 0;
+ buf = ci_req->hw_buf;
+ actlen = 0;
+ dtd = item;
+
+ do {
+ length = min(ci_req->req.length - actlen,
+ (unsigned)EP_MAX_LENGTH_TRANSFER);
+
+ dtd->info = INFO_BYTES(length) | INFO_ACTIVE;
+ dtd->page0 = (unsigned long)buf;
+ dtd->page1 = ((unsigned long)buf & 0xfffff000) + 0x1000;
+ dtd->page2 = ((unsigned long)buf & 0xfffff000) + 0x2000;
+ dtd->page3 = ((unsigned long)buf & 0xfffff000) + 0x3000;
+ dtd->page4 = ((unsigned long)buf & 0xfffff000) + 0x4000;
+
+ len -= length;
+ actlen += length;
+ buf += length;
+
+ if (len) {
+ qtd = (struct ept_queue_item *)
+ memalign(ILIST_ALIGN, ILIST_ENT_SZ);
+ dtd->next = (uint32_t)qtd;
+ dtd = qtd;
+ memset(dtd, 0, ILIST_ENT_SZ);
+ }
+
+ ci_req->dtd_count++;
+ } while (len);
+
+ item = dtd;
/*
* When sending the data for an IN transaction, the attached host
* knows that all data for the IN is sent when one of the following
@@ -432,6 +503,12 @@
ci_flush_qtd(num);
+ item = (struct ept_queue_item *)head->next;
+ while (item->next != TERMINATE) {
+ ci_flush_td((struct ept_queue_item *)item->next);
+ item = (struct ept_queue_item *)item->next;
+ }
+
DBG("ept%d %s queue len %x, req %p, buffer %p\n",
num, in ? "in" : "out", len, ci_req, ci_req->hw_buf);
ci_flush_qh(num);
@@ -497,21 +574,31 @@
static void handle_ep_complete(struct ci_ep *ci_ep)
{
- struct ept_queue_item *item;
- int num, in, len;
+ struct ept_queue_item *item, *next_td;
+ int num, in, len, j;
struct ci_req *ci_req;
num = ci_ep->desc->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
in = (ci_ep->desc->bEndpointAddress & USB_DIR_IN) != 0;
item = ci_get_qtd(num, in);
ci_invalidate_qtd(num);
-
- len = (item->info >> 16) & 0x7fff;
- if (item->info & 0xff)
- printf("EP%d/%s FAIL info=%x pg0=%x\n",
- num, in ? "in" : "out", item->info, item->page0);
-
ci_req = list_first_entry(&ci_ep->queue, struct ci_req, queue);
+
+ next_td = item;
+ len = 0;
+ for (j = 0; j < ci_req->dtd_count; j++) {
+ ci_invalidate_td(next_td);
+ item = next_td;
+ len += (item->info >> 16) & 0x7fff;
+ if (item->info & 0xff)
+ printf("EP%d/%s FAIL info=%x pg0=%x\n",
+ num, in ? "in" : "out", item->info, item->page0);
+ if (j != ci_req->dtd_count - 1)
+ next_td = (struct ept_queue_item *)item->next;
+ if (j != 0)
+ free(item);
+ }
+
list_del_init(&ci_req->queue);
ci_ep->req_primed = false;
@@ -852,9 +939,19 @@
controller.gadget.ep0 = &controller.ep[0].ep;
INIT_LIST_HEAD(&controller.gadget.ep0->ep_list);
- /* Init EP 1..n */
- for (i = 1; i < NUM_ENDPOINTS; i++) {
- memcpy(&controller.ep[i].ep, &ci_ep_init[1],
+ /* Init EP 1..3 */
+ for (i = 1; i < 4; i++) {
+ memcpy(&controller.ep[i].ep, &ci_ep_init[i],
+ sizeof(*ci_ep_init));
+ INIT_LIST_HEAD(&controller.ep[i].queue);
+ controller.ep[i].req_primed = false;
+ list_add_tail(&controller.ep[i].ep.ep_list,
+ &controller.gadget.ep_list);
+ }
+
+ /* Init EP 4..n */
+ for (i = 4; i < NUM_ENDPOINTS; i++) {
+ memcpy(&controller.ep[i].ep, &ci_ep_init[4],
sizeof(*ci_ep_init));
INIT_LIST_HEAD(&controller.ep[i].queue);
controller.ep[i].req_primed = false;
diff --git a/drivers/usb/gadget/ci_udc.h b/drivers/usb/gadget/ci_udc.h
index 346164a..95cc079 100644
--- a/drivers/usb/gadget/ci_udc.h
+++ b/drivers/usb/gadget/ci_udc.h
@@ -86,6 +86,7 @@
/* Buffer for the current transfer. Either req.buf/len or b_buf/len */
uint8_t *hw_buf;
uint32_t hw_len;
+ uint32_t dtd_count;
};
struct ci_ep {