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//
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//
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//    Copyright 2010 TheSeven
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//
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//
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//    This file is part of emCORE.
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//
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//    emCORE is free software: you can redistribute it and/or
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//    modify it under the terms of the GNU General Public License as
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//    published by the Free Software Foundation, either version 2 of the
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//    License, or (at your option) any later version.
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//
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//    emCORE is distributed in the hope that it will be useful,
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//    but WITHOUT ANY WARRANTY; without even the implied warranty of
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//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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//    See the GNU General Public License for more details.
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//
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//    You should have received a copy of the GNU General Public License along
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//    with emCORE.  If not, see <http://www.gnu.org/licenses/>.
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//
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//
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#include "global.h"
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#include "usb/usbtarget.h"
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#include "usb/usb.h"
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#include "nand.h"
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int usb_target_handle_request(uint32_t* buf, int bufsize, void** addr)
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{
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    int len = 0;
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    switch (buf[0])
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    {
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        case 0xffff0001:  // GET NAND INFO
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        {
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            int banks;
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            const struct nand_device_info_type* type = nand_get_device_type(0);
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            for (banks = 1; banks < 4; banks++)
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                if (!nand_get_device_type(banks))
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                    break;
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            buf[0] = 1;
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            buf[1] = type->id;
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            buf[2] = (banks << 16) | type->pagesperblock;
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            buf[3] = (type->blocks << 16) | type->userblocks;
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            break;
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        }
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        case 0xffff0002:  // READ NAND PAGES
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        case 0xffff0003:  // WRITE NAND PAGES
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        {
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            int banks;
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            const struct nand_device_info_type* type = nand_get_device_type(0);
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            for (banks = 1; banks < 4; banks++)
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                if (!nand_get_device_type(banks))
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                    break;
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            uint32_t pagecount = banks * type->blocks * type->pagesperblock;
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            if (buf[2] + buf[3] > pagecount)
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            {
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                buf[0] = 0xffff0001;
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                break;
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            }
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            int i;
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            uint32_t database = buf[1] & ~0xc0000000;
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            uint32_t sparebase = database + buf[3] * 2048;
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            uint32_t resultbase = sparebase + buf[3] * 64;
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            int doecc = buf[1] & 0x80000000;
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            int checkempty = buf[1] & 0x40000000;
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            for (i = 0; i < buf[3]; i++)
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            {
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                int lpage = buf[2] + i;
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                int bank = lpage % banks;
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                int page = lpage / banks;
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                int result;
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                if (buf[0] == 0xffff0002)
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                    result = nand_read_page(bank, page, (void*)(database + i * 2048),
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                                            (void*)(sparebase + i * 64), doecc, checkempty);
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                else if (buf[0] == 0xffff0003)
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                    result = nand_write_page(bank, page, (void*)(database + i * 2048),
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                                             (void*)(sparebase + i * 64), doecc);
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                *((int*)(resultbase + i * 4)) = result;
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            }
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            buf[0] = 1;
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            break;
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        }
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        case 0xffff0004:  // ERASE NAND PAGES
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        {
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            int banks;
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            const struct nand_device_info_type* type = nand_get_device_type(0);
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            for (banks = 1; banks < 4; banks++)
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                if (!nand_get_device_type(banks))
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                    break;
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            uint32_t blockcount = banks * type->blocks;
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            if (buf[2] + buf[3] > blockcount)
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            {
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                buf[0] = 0xffff0001;
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                break;
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            }
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            int i;
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            for (i = 0; i < buf[3]; i++)
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            {
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                int lblock = buf[2] + i;
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                int bank = lblock % banks;
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                int block = lblock / banks;
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                int result = nand_block_erase(bank, block * type->pagesperblock);
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                *((int*)(buf[1] + i * 4)) = result;
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            }
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            buf[0] = 1;
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            break;
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        }
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        default:
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            buf[0] = 2;
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            break;
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    }
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    return len;
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}