diff --git a/port/musb/usb_dc_musb.c b/port/musb/usb_dc_musb.c
index 4bcc7eee..ad61fabd 100644
--- a/port/musb/usb_dc_musb.c
+++ b/port/musb/usb_dc_musb.c
@@ -472,130 +472,6 @@ int usbd_ep_is_stalled(uint8_t busid, const uint8_t ep, uint8_t *stalled)
     return 0;
 }
 
-int usb_ep_out_data_avail(uint8_t ep_addr)
-{
-    uint16_t old_ep_idx, length;
-    uint8_t ep_idx = USB_EP_GET_IDX(ep_addr);
-
-    old_ep_idx = musb_get_active_ep();
-    musb_set_active_ep(ep_idx);
-
-    if (ep_idx == 0) {
-        if (!(HWREGB(USB_BASE + MUSB_IND_TXCSRL_OFFSET) & USB_CSRL0_RXRDY)) {
-            musb_set_active_ep(old_ep_idx);
-            return 0;
-        }
-        length = HWREGH(USB_BASE + MUSB_IND_RXCOUNT_OFFSET);
-        musb_set_active_ep(old_ep_idx);
-        return length;
-    } else {
-        if (!(HWREGB(USB_BASE + MUSB_IND_RXCSRL_OFFSET) & USB_RXCSRL1_RXRDY)) {
-            musb_set_active_ep(old_ep_idx);
-            return 0;
-        }
-        length = HWREGH(USB_BASE + MUSB_IND_RXCOUNT_OFFSET);
-        musb_set_active_ep(old_ep_idx);
-        return length;
-    }
-}
-
-int usb_ep_in_data_avail(uint8_t ep_addr)
-{
-    uint16_t old_ep_idx, length;
-    uint8_t ep_idx = USB_EP_GET_IDX(ep_addr);
-
-    old_ep_idx = musb_get_active_ep();
-    musb_set_active_ep(ep_idx);
-
-    if (ep_idx == 0) {
-        if (HWREGB(USB_BASE + MUSB_IND_TXCSRL_OFFSET) & USB_CSRL0_TXRDY) {
-            musb_set_active_ep(old_ep_idx);
-            return 0;
-        }
-    } else {
-        if (HWREGB(USB_BASE + MUSB_IND_TXCSRL_OFFSET) & USB_TXCSRL1_TXRDY) {
-            musb_set_active_ep(old_ep_idx);
-            return 0;
-        }
-    }
-    length = HWREGH(USB_BASE + MUSB_IND_TXMAP_OFFSET);
-    musb_set_active_ep(old_ep_idx);
-    return length;
-}
-
-int usb_ep_wait_in_data_avail(uint8_t ep_addr)
-{
-    uint32_t cnt;
-
-    for (cnt = 0; cnt < 3000; cnt++) {
-        if (usb_ep_in_data_avail(ep_addr))
-            return cnt;
-    }
-    return 0;
-}
-
-int usbd_read_packet(uint8_t ep_addr, uint8_t *buffer, uint16_t len)
-{
-    uint16_t old_ep_idx, cnt;
-    uint8_t ep_idx = USB_EP_GET_IDX(ep_addr);
-
-    old_ep_idx = musb_get_active_ep();
-    musb_set_active_ep(ep_idx);
-    if (ep_idx == 0) {
-        if (!(HWREGB(USB_BASE + MUSB_IND_TXCSRL_OFFSET) & USB_CSRL0_RXRDY)) {
-            musb_set_active_ep(old_ep_idx);
-            return 0;
-        }
-    } else {
-        if (!(HWREGB(USB_BASE + MUSB_IND_RXCSRL_OFFSET) & USB_RXCSRL1_RXRDY)) {
-            musb_set_active_ep(old_ep_idx);
-            return 0;
-        }
-    }
-    cnt = usb_ep_out_data_avail(ep_idx);
-    if (cnt) {
-        musb_read_packet(ep_idx, buffer, cnt);
-        HWREGB(USB_BASE + MUSB_IND_RXCSRL_OFFSET) &= ~(USB_RXCSRL1_OVER | USB_RXCSRL1_ERROR | USB_RXCSRL1_STALL | USB_RXCSRL1_STALLED);
-        HWREGB(USB_BASE + MUSB_IND_RXCSRL_OFFSET) &= ~(USB_RXCSRL1_RXRDY);
-        musb_set_active_ep(old_ep_idx);
-    }
-    return cnt;
-}
-
-int usbd_write_packet(uint8_t ep_addr, uint8_t *buffer, uint16_t len)
-{
-    uint16_t old_ep_idx, cnt;
-    uint8_t ep_idx = USB_EP_GET_IDX(ep_addr);
-
-    old_ep_idx = musb_get_active_ep();
-    musb_set_active_ep(ep_idx);
-    if (HWREGB(USB_BASE + MUSB_IND_TXCSRL_OFFSET) & USB_TXCSRL1_UNDRN) {
-        HWREGB(USB_BASE + MUSB_IND_TXCSRL_OFFSET) &= ~USB_TXCSRL1_UNDRN;
-    }
-    if (HWREGB(USB_BASE + MUSB_IND_TXCSRL_OFFSET) & USB_TXCSRL1_TXRDY) {
-        musb_set_active_ep(old_ep_idx);
-        return -1;
-    }
-
-    if (!buffer && len) {
-        return -2;
-    }
-
-    if (!len) {
-        HWREGB(USB_BASE + MUSB_IND_TXCSRL_OFFSET) |= USB_TXCSRL1_TXRDY;
-        return 0;
-    }
-
-    cnt = usb_ep_in_data_avail(ep_idx);
-    if (cnt) {
-        cnt = MIN(cnt, len);
-        musb_write_packet(ep_idx, buffer, cnt);
-        HWREGB(USB_BASE + MUSB_IND_TXCSRL_OFFSET) |= USB_TXCSRL1_TXRDY;
-        musb_set_active_ep(old_ep_idx);
-    }
-    return cnt;
-}
-
 int usbd_ep_start_write(uint8_t busid, const uint8_t ep, const uint8_t *data, uint32_t data_len)
 {
     uint8_t ep_idx = USB_EP_GET_IDX(ep);