Add usb_reg_map.h and usb_reg_map.c.

usb_reg_map.h contains the usual register map and register bit
definitions that libmaple convention requires.  It also contains a
variety of structs and convenience functions for accessing and
manipulating endpoint registers, BTABLE entries, and PMA buffers.

We'll be moving towards usb_reg_map.h instead of usb_lib/usb_regs.h.

Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>

libmaple/rules.mk

@@ -34,6 +34,7 @@ cSRCS_$(d) := adc.c                    \
               usb/descriptors.c        \
               usb/usb.c                \
               usb/usb_callbacks.c      \
+              usb/usb_reg_map.c        \
               usb/usb_lib/usb_core.c   \
               usb/usb_lib/usb_init.c   \
               usb/usb_lib/usb_int.c    \

libmaple/usb/usb_reg_map.c

@@ -0,0 +1,79 @@
+/******************************************************************************
+ * The MIT License
+ *
+ * Copyright (c) 2011 LeafLabs, LLC.
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy,
+ * modify, merge, publish, distribute, sublicense, and/or sell copies
+ * of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *****************************************************************************/
+
+#include "usb_reg_map.h"
+
+/* TODO these could use some improvement; they're fairly
+ * straightforward ports of the analogous ST code.  The PMA blit
+ * routines in particular are obvious targets for performance
+ * measurement and tuning. */
+
+void usb_copy_to_pma(const uint8 *buf, uint16 len, uint16 pma_offset) {
+    uint16 *dst = (uint16*)usb_pma_ptr(pma_offset);
+    uint16 n = len >> 1;
+    uint16 i;
+    for (i = 0; i < n; i++) {
+        *dst = (uint16)(*buf) | *(buf + 1) << 8;
+        buf += 2;
+        dst += 2;
+    }
+    if (len & 1) {
+        *dst = *buf;
+    }
+}
+
+void usb_copy_from_pma(uint8 *buf, uint16 len, uint16 pma_offset) {
+    uint32 *src = (uint32*)usb_pma_ptr(pma_offset);
+    uint16 *dst = (uint16*)buf;
+    uint16 n = len >> 1;
+    uint16 i;
+    for (i = 0; i < n; i++) {
+        *dst++ = *src++;
+    }
+    if (len & 1) {
+        *dst = *src & 0xFF;
+    }
+}
+
+void usb_set_ep_rx_count(uint8 ep, uint16 count) {
+    uint32 *rxc = usb_ep_rx_count_ptr(ep);
+    uint16 nblocks;
+    if (count > 62) {
+        /* use 32-byte memory block size */
+        nblocks = count >> 5;
+        if ((count & 0x1F) == 0) {
+            nblocks--;
+        }
+        *rxc = (nblocks << 10) | 0x8000;
+    } else {
+        /* use 2-byte memory block size */
+        nblocks = count >> 1;
+        if ((count & 0x1) != 0) {
+            nblocks++;
+        }
+        *rxc = nblocks << 10;
+    }
+}