// Copyright 2014 Normmatt
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.

#include "common.h"

#include "sdmmc.h"
#include "delay.h"

struct mmcdevice handleNAND;
struct mmcdevice handleSD;

static inline u16 sdmmc_read16(u16 reg) {
    return *(vu16*)(SDMMC_BASE + reg);
}

static inline void sdmmc_write16(u16 reg, u16 val) {
    *(vu16*)(SDMMC_BASE + reg) = val;
}

static inline u32 sdmmc_read32(u16 reg) {
    return *(vu32*)(SDMMC_BASE + reg);
}

static inline void sdmmc_write32(u16 reg, u32 val) {
    *(vu32*)(SDMMC_BASE + reg) = val;
}

static inline void sdmmc_mask16(u16 reg, const u16 clear, const u16 set) {
    u16 val = sdmmc_read16(reg);
    val &= ~clear;
    val |= set;
    sdmmc_write16(reg, val);
}

static inline void setckl(u32 data)
{
    sdmmc_mask16(REG_SDCLKCTL, 0x100, 0);
    sdmmc_mask16(REG_SDCLKCTL, 0x2FF, data & 0x2FF);
    sdmmc_mask16(REG_SDCLKCTL, 0x0, 0x100);
}


mmcdevice *getMMCDevice(int drive)
{
    if(drive==0) return &handleNAND;
    return &handleSD;
}

static u32 __attribute__((noinline)) geterror(struct mmcdevice *ctx)
{
    return (ctx->error << 29) >> 31;
}

static void __attribute__((noinline)) inittarget(struct mmcdevice *ctx)
{
    sdmmc_mask16(REG_SDPORTSEL,0x3,(u16)ctx->devicenumber);
    setckl(ctx->clk);
    if (ctx->SDOPT == 0) {
        sdmmc_mask16(REG_SDOPT, 0, 0x8000);
    } else {
        sdmmc_mask16(REG_SDOPT, 0x8000, 0);
    }

}

static void __attribute__((noinline)) sdmmc_send_command(struct mmcdevice *ctx, u32 cmd, u32 args)
{
    bool getSDRESP = (cmd << 15) >> 31;
    u16 flags = (cmd << 15) >> 31;
    const bool readdata = cmd & 0x20000;
    const bool writedata = cmd & 0x40000;

    if (readdata || writedata)
        flags |= TMIO_STAT0_DATAEND;

    ctx->error = 0;
    while (sdmmc_read16(REG_SDSTATUS1) & TMIO_STAT1_CMD_BUSY); //mmc working?
    sdmmc_write16(REG_SDIRMASK0,0);
    sdmmc_write16(REG_SDIRMASK1,0);
    sdmmc_write16(REG_SDSTATUS0,0);
    sdmmc_write16(REG_SDSTATUS1,0);
    sdmmc_mask16(REG_SDDATACTL32,0x1800,0);

    sdmmc_write16(REG_SDCMDARG0,args &0xFFFF);
    sdmmc_write16(REG_SDCMDARG1,args >> 16);
    sdmmc_write16(REG_SDCMD,cmd &0xFFFF);

    u32 size = ctx->size;
    vu8 *dataPtr = ctx->data;

    bool useBuf = ( NULL != dataPtr );

    u16 status0 = 0;
    while(true) {
        u16 status1 = sdmmc_read16(REG_SDSTATUS1);
        if (status1 & TMIO_STAT1_RXRDY) {
            if (readdata && useBuf) {
                sdmmc_mask16(REG_SDSTATUS1, TMIO_STAT1_RXRDY, 0);
                //sdmmc_write16(REG_SDSTATUS1,~TMIO_STAT1_RXRDY);
                if (size > 0x1FF) {
                    for(int i = 0; i<0x200; i+=2) {
                        u16 data = sdmmc_read16(REG_SDFIFO);
                        *dataPtr++ = data & 0xFF;
                        *dataPtr++ = data >> 8;
                    }
                    size -= 0x200;
                }
            }
        }

        if (status1 & TMIO_STAT1_TXRQ) {
            if (writedata && useBuf) {
                sdmmc_mask16(REG_SDSTATUS1, TMIO_STAT1_TXRQ, 0);
                //sdmmc_write16(REG_SDSTATUS1,~TMIO_STAT1_TXRQ);
                if (size > 0x1FF) {
                    for (int i = 0; i<0x200; i+=2) {
                        u16 data = *dataPtr++;
                        data |= *dataPtr++ << 8;
                        sdmmc_write16(REG_SDFIFO, data);
                    }
                    size -= 0x200;
                }
            }
        }
        if (status1 & TMIO_MASK_GW) {
            ctx->error |= 4;
            break;
        }

        if (!(status1 & TMIO_STAT1_CMD_BUSY)) {
            status0 = sdmmc_read16(REG_SDSTATUS0);
            if (sdmmc_read16(REG_SDSTATUS0) & TMIO_STAT0_CMDRESPEND)
                ctx->error |= 0x1;
            if (status0 & TMIO_STAT0_DATAEND)
                ctx->error |= 0x2;

            if ((status0 & flags) == flags)
                break;
        }
    }
    ctx->stat0 = sdmmc_read16(REG_SDSTATUS0);
    ctx->stat1 = sdmmc_read16(REG_SDSTATUS1);
    sdmmc_write16(REG_SDSTATUS0,0);
    sdmmc_write16(REG_SDSTATUS1,0);

    if (getSDRESP != 0) {
        ctx->ret[0] = (u32)sdmmc_read16(REG_SDRESP0) | (u32)(sdmmc_read16(REG_SDRESP1) << 16);
        ctx->ret[1] = (u32)sdmmc_read16(REG_SDRESP2) | (u32)(sdmmc_read16(REG_SDRESP3) << 16);
        ctx->ret[2] = (u32)sdmmc_read16(REG_SDRESP4) | (u32)(sdmmc_read16(REG_SDRESP5) << 16);
        ctx->ret[3] = (u32)sdmmc_read16(REG_SDRESP6) | (u32)(sdmmc_read16(REG_SDRESP7) << 16);
    }
}

u32 __attribute__((noinline)) sdmmc_sdcard_writesectors(u32 sector_no, u32 numsectors, vu8 *in)
{
    if (handleSD.isSDHC == 0)
        sector_no <<= 9;
    inittarget(&handleSD);
    sdmmc_write16(REG_SDSTOP,0x100);

    sdmmc_write16(REG_SDBLKCOUNT,numsectors);
    handleSD.data = in;
    handleSD.size = numsectors << 9;
    sdmmc_send_command(&handleSD,0x52C19,sector_no);
    return geterror(&handleSD);
}

u32 __attribute__((noinline)) sdmmc_sdcard_readsectors(u32 sector_no, u32 numsectors, vu8 *out)
{
    if (handleSD.isSDHC == 0)
        sector_no <<= 9;
    inittarget(&handleSD);
    sdmmc_write16(REG_SDSTOP,0x100);

    sdmmc_write16(REG_SDBLKCOUNT,numsectors);
    handleSD.data = out;
    handleSD.size = numsectors << 9;
    sdmmc_send_command(&handleSD,0x33C12,sector_no);
    return geterror(&handleSD);
}

u32 __attribute__((noinline)) sdmmc_nand_readsectors(u32 sector_no, u32 numsectors, vu8 *out)
{
    if (handleNAND.isSDHC == 0)
        sector_no <<= 9;
    inittarget(&handleNAND);
    sdmmc_write16(REG_SDSTOP,0x100);

    sdmmc_write16(REG_SDBLKCOUNT,numsectors);

    handleNAND.data = out;
    handleNAND.size = numsectors << 9;
    sdmmc_send_command(&handleNAND,0x33C12,sector_no);
    inittarget(&handleSD);
    return geterror(&handleNAND);
}

u32 __attribute__((noinline)) sdmmc_nand_writesectors(u32 sector_no, u32 numsectors, vu8 *in) //experimental
{
    if (handleNAND.isSDHC == 0)
        sector_no <<= 9;
    inittarget(&handleNAND);
    sdmmc_write16(REG_SDSTOP,0x100);

    sdmmc_write16(REG_SDBLKCOUNT,numsectors);

    handleNAND.data = in;
    handleNAND.size = numsectors << 9;
    sdmmc_send_command(&handleNAND,0x52C19,sector_no);
    inittarget(&handleSD);
    return geterror(&handleNAND);
}

static u32 calcSDSize(u8* csd, int type)
{
    u32 result = 0;
    if (type == -1) type = csd[14] >> 6;
    switch (type) {
        case 0:
            {
                u32 block_len = csd[9] & 0xf;
                block_len = 1u << block_len;
                u32 mult = (u32)(csd[4] >> 7) | (u32)((csd[5] & 3) << 1);
                mult = 1u << (mult + 2);
                result = csd[8] & 3;
                result = (result << 8) | csd[7];
                result = (result << 2) | (csd[6] >> 6);
                result = (result + 1) * mult * block_len / 512;
            }
            break;
        case 1:
            result = csd[7] & 0x3f;
            result = (result << 8) | csd[6];
            result = (result << 8) | csd[5];
            result = (result + 1) * 1024;
            break;
    default:
        break; //Do nothing otherwise
    }
    return result;
}

static void InitSD()
{
    //NAND
    handleNAND.isSDHC = 0;
    handleNAND.SDOPT = 0;
    handleNAND.res = 0;
    handleNAND.initarg = 1;
    handleNAND.clk = 0x80;
    handleNAND.devicenumber = 1;

    //SD
    handleSD.isSDHC = 0;
    handleSD.SDOPT = 0;
    handleSD.res = 0;
    handleSD.initarg = 0;
    handleSD.clk = 0x80;
    handleSD.devicenumber = 0;

    *(vu16*)0x10006100 &= 0xF7FFu; //SDDATACTL32
    *(vu16*)0x10006100 &= 0xEFFFu; //SDDATACTL32
    *(vu16*)0x10006100 |= 0x402u; //SDDATACTL32
    *(vu16*)0x100060D8 = (*(vu16*)0x100060D8 & 0xFFDD) | 2;
    *(vu16*)0x10006100 &= 0xFFFDu; //SDDATACTL32
    *(vu16*)0x100060D8 &= 0xFFDDu; //SDDATACTL
    *(vu16*)0x10006104 = 0; //SDBLKLEN32
    *(vu16*)0x10006108 = 1; //SDBLKCOUNT32
    *(vu16*)0x100060E0 &= 0xFFFEu; //SDRESET
    *(vu16*)0x100060E0 |= 1u; //SDRESET
    *(vu16*)0x10006020 |= TMIO_MASK_ALL; //SDIR_MASK0
    *(vu16*)0x10006022 |= TMIO_MASK_ALL>>16; //SDIR_MASK1
    *(vu16*)0x100060FC |= 0xDBu; //SDCTL_RESERVED7
    *(vu16*)0x100060FE |= 0xDBu; //SDCTL_RESERVED8
    *(vu16*)0x10006002 &= 0xFFFCu; //SDPORTSEL
    *(vu16*)0x10006024 = 0x40; //Nintendo sets this to 0x20
    *(vu16*)0x10006028 = 0x40EB; //Nintendo sets this to 0x40EE
    *(vu16*)0x10006002 &= 0xFFFCu; ////SDPORTSEL
    *(vu16*)0x10006026 = 512; //SDBLKLEN
    *(vu16*)0x10006008 = 0; //SDSTOP

    inittarget(&handleSD);
}

static int Nand_Init()
{
    inittarget(&handleNAND);
    waitcycles(0xF000);

    sdmmc_send_command(&handleNAND,0,0);

    do {
        do {
            sdmmc_send_command(&handleNAND,0x10701,0x100000);
        } while ( !(handleNAND.error & 1) );
    } while((handleNAND.ret[0] & 0x80000000) == 0);

    sdmmc_send_command(&handleNAND,0x10602,0x0);
    if (handleNAND.error & 0x4) return -1;

    sdmmc_send_command(&handleNAND,0x10403,handleNAND.initarg << 0x10);
    if (handleNAND.error & 0x4) return -1;

    sdmmc_send_command(&handleNAND,0x10609,handleNAND.initarg << 0x10);
    if (handleNAND.error & 0x4) return -1;

    handleNAND.total_size = calcSDSize((u8*)&handleNAND.ret[0],0);
    handleNAND.clk = 1;
    setckl(1);

    sdmmc_send_command(&handleNAND,0x10407,handleNAND.initarg << 0x10);
    if (handleNAND.error & 0x4) return -1;

    handleNAND.SDOPT = 1;

    sdmmc_send_command(&handleNAND,0x10506,0x3B70100);
    if (handleNAND.error & 0x4) return -1;

    sdmmc_send_command(&handleNAND,0x10506,0x3B90100);
    if (handleNAND.error & 0x4) return -1;

    sdmmc_send_command(&handleNAND,0x1040D,handleNAND.initarg << 0x10);
    if (handleNAND.error & 0x4) return -1;

    sdmmc_send_command(&handleNAND,0x10410,0x200);
    if (handleNAND.error & 0x4) return -1;

    handleNAND.clk |= 0x200;

    inittarget(&handleSD);

    return 0;
}

static int SD_Init()
{
    inittarget(&handleSD);

    waitcycles(1u << 19); //Card needs a little bit of time to be detected, it seems
    
    //If not inserted
    if (!(*((vu16*)0x1000601c) & TMIO_STAT0_SIGSTATE)) return -1;
    
    sdmmc_send_command(&handleSD,0,0);
    sdmmc_send_command(&handleSD,0x10408,0x1AA);
    //u32 temp = (handleSD.ret[0] == 0x1AA) << 0x1E;
    u32 temp = (handleSD.error & 0x1) << 0x1E;

    //int count = 0;
    u32 temp2 = 0;
    do {
        do {
            sdmmc_send_command(&handleSD,0x10437,handleSD.initarg << 0x10);
            sdmmc_send_command(&handleSD,0x10769,0x00FF8000 | temp);
            temp2 = 1;
        } while ( !(handleSD.error & 1) );

    } while((handleSD.ret[0] & 0x80000000) == 0);

    if(!((handleSD.ret[0] >> 30) & 1) || !temp)
        temp2 = 0;

    handleSD.isSDHC = temp2;

    sdmmc_send_command(&handleSD,0x10602,0);
    if (handleSD.error & 0x4) return -1;

    sdmmc_send_command(&handleSD,0x10403,0);
    if (handleSD.error & 0x4) return -1;
    handleSD.initarg = handleSD.ret[0] >> 0x10;

    sdmmc_send_command(&handleSD,0x10609,handleSD.initarg << 0x10);
    if (handleSD.error & 0x4) return -1;

    handleSD.total_size = calcSDSize((u8*)&handleSD.ret[0],-1);
    handleSD.clk = 1;
    setckl(1);

    sdmmc_send_command(&handleSD,0x10507,handleSD.initarg << 0x10);
    if (handleSD.error & 0x4) return -1;

    sdmmc_send_command(&handleSD,0x10437,handleSD.initarg << 0x10);
    if (handleSD.error & 0x4) return -1;

    handleSD.SDOPT = 1;
    sdmmc_send_command(&handleSD,0x10446,0x2);
    if (handleSD.error & 0x4) return -1;

    sdmmc_send_command(&handleSD,0x1040D,handleSD.initarg << 0x10);
    if (handleSD.error & 0x4) return -1;

    sdmmc_send_command(&handleSD,0x10410,0x200);
    if (handleSD.error & 0x4) return -1;
    handleSD.clk |= 0x200;

    return 0;
}

int sdmmc_sdcard_init()
{
    InitSD();
    int result = Nand_Init();
    return result | SD_Init();
}