/******************************************************************************
 * 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;
    }
}

static void usb_set_ep_rx_count_common(uint32 *rxc, uint16 count) {
    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;
    }
}

void usb_set_ep_rx_buf0_count(uint8 ep, uint16 count) {
    uint32 *rxc = usb_ep_rx_buf0_count_ptr(ep);
    usb_set_ep_rx_count_common(rxc, count);
}

void usb_set_ep_rx_count(uint8 ep, uint16 count) {
    uint32 *rxc = usb_ep_rx_count_ptr(ep);
    usb_set_ep_rx_count_common(rxc, count);
}
