usb: dwc3: gadget: dynamically re-size TxFifos
We need to dynamically re-size TxFifos for the
cases where default values will not do.
While at that, we create a simple function which,
for now, will just allocate one full packet fifo
space for each of the enabled endpoints.
This can be improved later in order to allow for
better throughput by allocating more space for
endpoints which could make good use of that like
isochronous and bulk.
Signed-off-by: Felipe Balbi <balbi@ti.com>
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index f4878c4..123c3aa 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -172,6 +172,10 @@
#define DWC3_GUSB3PIPECTL_PHYSOFTRST (1 << 31)
#define DWC3_GUSB3PIPECTL_SUSPHY (1 << 17)
+/* Global TX Fifo Size Register */
+#define DWC3_GTXFIFOSIZ_TXFDEF(n) ((n) & 0xffff)
+#define DWC3_GTXFIFOSIZ_TXFSTADDR(n) ((n) & 0xffff0000)
+
/* Global HWPARAMS1 Register */
#define DWC3_GHWPARAMS1_EN_PWROPT(n) ((n & (3 << 24)) >> 24)
#define DWC3_GHWPARAMS1_EN_PWROPT_NO 0
@@ -546,8 +550,13 @@
#define DWC3_MODE_DRD 2
#define DWC3_MODE_HUB 3
+#define DWC3_MDWIDTH(n) (((n) & 0xff00) >> 8)
+
/* HWPARAMS1 */
-#define DWC3_NUM_INT(n) (((n) & (0x3f << 15)) >> 15)
+#define DWC3_NUM_INT(n) (((n) & (0x3f << 15)) >> 15)
+
+/* HWPARAMS7 */
+#define DWC3_RAM1_DEPTH(n) ((n) & 0xffff)
struct dwc3_request {
struct usb_request request;
@@ -594,6 +603,8 @@
* @ep0_expect_in: true when we expect a DATA IN transfer
* @start_config_issued: true when StartConfig command has been issued
* @setup_packet_pending: true when there's a Setup Packet in FIFO. Workaround
+ * @needs_fifo_resize: not all users might want fifo resizing, flag it
+ * @resize_fifos: tells us it's ok to reconfigure our TxFIFO sizes.
* @ep0_next_event: hold the next expected event
* @ep0state: state of endpoint zero
* @link_state: link state
@@ -651,6 +662,8 @@
unsigned start_config_issued:1;
unsigned setup_packet_pending:1;
unsigned delayed_status:1;
+ unsigned needs_fifo_resize:1;
+ unsigned resize_fifos:1;
enum dwc3_ep0_next ep0_next_event;
enum dwc3_ep0_state ep0state;
@@ -812,6 +825,7 @@
/* prototypes */
void dwc3_set_mode(struct dwc3 *dwc, u32 mode);
+int dwc3_gadget_resize_tx_fifos(struct dwc3 *dwc);
int dwc3_host_init(struct dwc3 *dwc);
void dwc3_host_exit(struct dwc3 *dwc);