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//

//

//    Copyright 2010 TheSeven

//

//

//    This file is part of emBIOS.

//

//    emBIOS is free software: you can redistribute it and/or

//    modify it under the terms of the GNU General Public License as

//    published by the Free Software Foundation, either version 2 of the

//    License, or (at your option) any later version.

//

//    emBIOS is distributed in the hope that it will be useful,

//    but WITHOUT ANY WARRANTY; without even the implied warranty of

//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

//    See the GNU General Public License for more details.

//

//    You should have received a copy of the GNU General Public License along

//    with emBIOS.  If not, see <http://www.gnu.org/licenses/>.

//

//

#include "global.h"

#include "panic.h"

#include "thread.h"

#include "util.h"

#include "timer.h"

#include "nand.h"

#include "pmu.h"

#include "mmu.h"

#include "s5l8701.h"

#define NAND_CMD_READ       0x00

#define NAND_CMD_PROGCNFRM  0x10

#define NAND_CMD_READ2      0x30

#define NAND_CMD_BLOCKERASE 0x60

#define NAND_CMD_GET_STATUS 0x70

#define NAND_CMD_PROGRAM    0x80

#define NAND_CMD_ERASECNFRM 0xD0

#define NAND_CMD_RESET      0xFF

#define NAND_STATUS_READY   0x40

static const struct nand_device_info_type nand_deviceinfotable[] =

{

    {0x1580F1EC, 1024, 968, 0x40, 6, 2, 1, 2, 1},

    {0x1580DAEC, 2048, 1936, 0x40, 6, 2, 1, 2, 1},

    {0x15C1DAEC, 2048, 1936, 0x40, 6, 2, 1, 2, 1},

    {0x1510DCEC, 4096, 3872, 0x40, 6, 2, 1, 2, 1},

    {0x95C1DCEC, 4096, 3872, 0x40, 6, 2, 1, 2, 1},

    {0x2514DCEC, 2048, 1936, 0x80, 7, 2, 1, 2, 1},

    {0x2514D3EC, 4096, 3872, 0x80, 7, 2, 1, 2, 1},

    {0x2555D3EC, 4096, 3872, 0x80, 7, 2, 1, 2, 1},

    {0x2555D5EC, 8192, 7744, 0x80, 7, 2, 1, 2, 1},

    {0x2585D3AD, 4096, 3872, 0x80, 7, 3, 2, 3, 2},

    {0x9580DCAD, 4096, 3872, 0x40, 6, 3, 2, 3, 2},

    {0xA514D3AD, 4096, 3872, 0x80, 7, 3, 2, 3, 2},

    {0xA550D3AD, 4096, 3872, 0x80, 7, 3, 2, 3, 2},

    {0xA560D5AD, 4096, 3872, 0x80, 7, 3, 2, 3, 2},

    {0xA555D5AD, 8192, 7744, 0x80, 7, 3, 2, 3, 2},

    {0xA585D598, 8320, 7744, 0x80, 7, 3, 1, 2, 1},

    {0xA584D398, 4160, 3872, 0x80, 7, 3, 1, 2, 1},

    {0x95D1D32C, 8192, 7744, 0x40, 6, 2, 1, 2, 1},

    {0x1580DC2C, 4096, 3872, 0x40, 6, 2, 1, 2, 1},

    {0x15C1D32C, 8192, 7744, 0x40, 6, 2, 1, 2, 1},

    {0x9590DC2C, 4096, 3872, 0x40, 6, 2, 1, 2, 1},

    {0xA594D32C, 4096, 3872, 0x80, 7, 2, 1, 2, 1},

    {0x2584DC2C, 2048, 1936, 0x80, 7, 2, 1, 2, 1},

    {0xA5D5D52C, 8192, 7744, 0x80, 7, 3, 2, 2, 1},

    {0x95D1D389, 8192, 7744, 0x40, 6, 2, 1, 2, 1},

    {0x1580DC89, 4096, 3872, 0x40, 6, 2, 1, 2, 1},

    {0x15C1D389, 8192, 7744, 0x40, 6, 2, 1, 2, 1},

    {0x9590DC89, 4096, 3872, 0x40, 6, 2, 1, 2, 1},

    {0xA594D389, 4096, 3872, 0x80, 7, 2, 1, 2, 1},

    {0x2584DC89, 2048, 1936, 0x80, 7, 2, 1, 2, 1},

    {0xA5D5D589, 8192, 7744, 0x80, 7, 2, 1, 2, 1},

    {0xA514D320, 4096, 3872, 0x80, 7, 2, 1, 2, 1},

    {0xA555D520, 8192, 3872, 0x80, 7, 2, 1, 2, 1}

};

static uint8_t nand_tunk1[4];

static uint8_t nand_twp[4];

static uint8_t nand_tunk2[4];

static uint8_t nand_tunk3[4];

static int nand_type[4];

static int nand_powered = 0;

static int nand_interleaved = 0;

static int nand_cached = 0;

static long nand_last_activity_value = -1;

static uint32_t nand_stack[0x80];

static struct mutex nand_mtx;

static struct wakeup nand_wakeup;

static struct mutex ecc_mtx;

static struct wakeup ecc_wakeup;

static uint8_t nand_ctrl[0x200] CACHEALIGN_ATTR;

static uint8_t nand_spare[0x40] CACHEALIGN_ATTR;

static uint8_t nand_ecc[0x30] CACHEALIGN_ATTR;

static uint32_t nand_unlock(uint32_t rc)

{

    nand_last_activity_value = USEC_TIMER;

    mutex_unlock(&nand_mtx);

    return rc;

}

static uint32_t ecc_unlock(uint32_t rc)

{

    mutex_unlock(&ecc_mtx);

    return rc;

}

static uint32_t nand_timeout(long timeout)

{

    if (TIME_AFTER(USEC_TIMER, timeout)) return 1;

    else

    {

        yield();

        return 0;

    }

}

static uint32_t nand_wait_rbbdone(void)

{

    uint32_t timeout = USEC_TIMER + 20000;

    while (!(FMCSTAT & FMCSTAT_RBBDONE))

        if (nand_timeout(timeout)) return 1;

    FMCSTAT = FMCSTAT_RBBDONE;

    return 0;

}

static uint32_t nand_wait_cmddone(void)

{

    uint32_t timeout = USEC_TIMER + 20000;

    while (!(FMCSTAT & FMCSTAT_CMDDONE))

        if (nand_timeout(timeout)) return 1;

    FMCSTAT = FMCSTAT_CMDDONE;

    return 0;

}

static uint32_t nand_wait_addrdone(void)

{

    uint32_t timeout = USEC_TIMER + 20000;

    while (!(FMCSTAT & FMCSTAT_ADDRDONE))

        if (nand_timeout(timeout)) return 1;

    FMCSTAT = FMCSTAT_ADDRDONE;

    return 0;

}

static uint32_t nand_wait_chip_ready(uint32_t bank)

{

    uint32_t timeout = USEC_TIMER + 20000;

    while (!(FMCSTAT & (FMCSTAT_BANK0READY << bank)))

        if (nand_timeout(timeout)) return 1;

    FMCSTAT = (FMCSTAT_BANK0READY << bank);

    return 0;

}

static void nand_set_fmctrl0(uint32_t bank, uint32_t flags)

{

    FMCTRL0 = (nand_tunk1[bank] << 16) | (nand_twp[bank] << 12)

            | (1 << 11) | 1 | (1 << (bank + 1)) | flags;

}

static uint32_t nand_send_cmd(uint32_t cmd)

{

    FMCMD = cmd;

    return nand_wait_rbbdone();

}

static uint32_t nand_send_address(uint32_t page, uint32_t offset)

{

    FMANUM = 4;

    FMADDR0 = (page << 16) | offset;

    FMADDR1 = (page >> 16) & 0xFF;

    FMCTRL1 = FMCTRL1_DOTRANSADDR;

    return nand_wait_cmddone();

}

uint32_t nand_reset(uint32_t bank)

{

    nand_set_fmctrl0(bank, 0);

    if (nand_send_cmd(NAND_CMD_RESET)) return 1;

    if (nand_wait_chip_ready(bank)) return 1;

    FMCTRL1 = FMCTRL1_CLEARRFIFO | FMCTRL1_CLEARWFIFO;

    sleep(1000);

    return 0;

}

static uint32_t nand_wait_status_ready(uint32_t bank)

{

    uint32_t timeout = USEC_TIMER + 20000;

    nand_set_fmctrl0(bank, 0);

    if ((FMCSTAT & (FMCSTAT_BANK0READY << bank)))

        FMCSTAT = (FMCSTAT_BANK0READY << bank);

    FMCTRL1 = FMCTRL1_CLEARRFIFO;

    if (nand_send_cmd(NAND_CMD_GET_STATUS)) return 1;

    while (1)

    {

        if (nand_timeout(timeout)) return 1;

        FMDNUM = 0;

        FMCTRL1 = FMCTRL1_DOREADDATA;

        if (nand_wait_addrdone()) return 1;

        if ((FMFIFO & NAND_STATUS_READY)) break;

        FMCTRL1 = FMCTRL1_CLEARRFIFO;

    }

    FMCTRL1 = FMCTRL1_CLEARRFIFO;

    return nand_send_cmd(NAND_CMD_READ);

}

static void nand_transfer_data_start(uint32_t bank, uint32_t direction,

                                     void* buffer, uint32_t size)

{

    nand_set_fmctrl0(bank, FMCTRL0_ENABLEDMA);

    FMDNUM = size - 1;

    FMCTRL1 = FMCTRL1_DOREADDATA << direction;

    DMACON3 = (2 << DMACON_DEVICE_SHIFT)

            | (direction << DMACON_DIRECTION_SHIFT)

            | (2 << DMACON_DATA_SIZE_SHIFT)

            | (3 << DMACON_BURST_LEN_SHIFT);

    while ((DMAALLST & DMAALLST_CHAN3_MASK))

        DMACOM3 = DMACOM_CLEARBOTHDONE;

    DMABASE3 = (uint32_t)buffer;

    DMATCNT3 = (size >> 4) - 1;

    clean_dcache();

    DMACOM3 = 4;

}

static uint32_t nand_transfer_data_collect(uint32_t direction)

{

    uint32_t timeout = USEC_TIMER + 20000;

    while ((DMAALLST & DMAALLST_DMABUSY3))

        if (nand_timeout(timeout)) return 1;

    if (!direction) invalidate_dcache();

    if (nand_wait_addrdone()) return 1;

    if (!direction) FMCTRL1 = FMCTRL1_CLEARRFIFO | FMCTRL1_CLEARWFIFO;

    else FMCTRL1 = FMCTRL1_CLEARRFIFO;

    return 0;

}

static uint32_t nand_transfer_data(uint32_t bank, uint32_t direction,

                                   void* buffer, uint32_t size)

{

    nand_transfer_data_start(bank, direction, buffer, size);

    uint32_t rc = nand_transfer_data_collect(direction);

    return rc;

}

static void ecc_start(uint32_t size, void* databuffer, void* sparebuffer,

                      uint32_t type)

{

    mutex_lock(&ecc_mtx, TIMEOUT_BLOCK);

    ECC_INT_CLR = 1;

    SRCPND = (1 << IRQ_ECC);

    ECC_UNK1 = size;

    ECC_DATA_PTR = (uint32_t)databuffer;

    ECC_SPARE_PTR = (uint32_t)sparebuffer;

    clean_dcache();

    ECC_CTRL = type;

}

static uint32_t ecc_collect(void)

{

    uint32_t timeout = USEC_TIMER + 20000;

    while (!(SRCPND & (1 << IRQ_ECC)))

        if (nand_timeout(timeout)) return ecc_unlock(1);

    invalidate_dcache();

    ECC_INT_CLR = 1;

    SRCPND = (1 << IRQ_ECC);

    return ecc_unlock(ECC_RESULT);

}

static uint32_t ecc_decode(uint32_t size, void* databuffer, void* sparebuffer)

{

    ecc_start(size, databuffer, sparebuffer, ECCCTRL_STARTDECODING);

    uint32_t rc = ecc_collect();

    return rc;

}

static uint32_t ecc_encode(uint32_t size, void* databuffer, void* sparebuffer)

{

    ecc_start(size, databuffer, sparebuffer, ECCCTRL_STARTENCODING);

    ecc_collect();

    return 0;

}

static uint32_t nand_check_empty(uint8_t* buffer)

{

    uint32_t i, count;

    count = 0;

    for (i = 0; i < 0x40; i++) if (buffer[i] != 0xFF) count++;

    if (count < 2) return 1;

    return 0;

}

static uint32_t nand_get_chip_type(uint32_t bank)

{

    mutex_lock(&nand_mtx, TIMEOUT_BLOCK);

    uint32_t result;

    if (nand_reset(bank)) return nand_unlock(0xFFFFFFFE);

    if (nand_send_cmd(0x90)) return nand_unlock(0xFFFFFFFD);

    FMANUM = 0;

    FMADDR0 = 0;

    FMCTRL1 = FMCTRL1_DOTRANSADDR;

    if (nand_wait_cmddone()) return nand_unlock(0xFFFFFFFC);

    FMDNUM = 4;

    FMCTRL1 = FMCTRL1_DOREADDATA;

    if (nand_wait_addrdone()) return nand_unlock(0xFFFFFFFB);

    result = FMFIFO;

    FMCTRL1 = FMCTRL1_CLEARRFIFO;

    return nand_unlock(result);

}

void nand_set_active(void)

{

    nand_last_activity_value = USEC_TIMER;

}

long nand_last_activity(void)

{

    return nand_last_activity_value;

}

void nand_power_up(void)

{

    uint32_t i;

    mutex_lock(&nand_mtx, TIMEOUT_BLOCK);

    nand_last_activity_value = USEC_TIMER;

    PWRCON(1) &= ~0x40;

    PWRCON(0) &= ~0x100000;

    PCON2 = 0x33333333;

    PDAT2 = 0;

    PCON3 = 0x11113333;

    PDAT3 = 0;

    PCON4 = 0x33333333;

    PDAT4 = 0;

    PCON5 = (PCON5 & ~0xF) | 3;

    PUNK5 = 1;

    pmu_ldo_set_voltage(4, 0x15);

    pmu_ldo_power_on(4);

    sleep(50000);

    nand_last_activity_value = USEC_TIMER;

    for (i = 0; i < 4; i++)

        if (nand_type[i] >= 0)

            if (nand_reset(i))

				panicf(PANIC_FATAL, "nand_power_up: nand_reset(bank=%d) failed.", (unsigned int)i);

    nand_powered = 1;

    nand_last_activity_value = USEC_TIMER;

    mutex_unlock(&nand_mtx);

}

void nand_power_down(void)

{

    if (!nand_powered) return;

    mutex_lock(&nand_mtx, TIMEOUT_BLOCK);

    pmu_ldo_power_off(4);

    PCON2 = 0x11111111;

    PDAT2 = 0;

    PCON3 = 0x11111111;

    PDAT3 = 0;

    PCON4 = 0x11111111;

    PDAT4 = 0;

    PCON5 = (PCON5 & ~0xF) | 1;

    PUNK5 = 1;

    PWRCON(1) |= 0x40;

    PWRCON(0) |= 0x100000;

    nand_powered = 0;

    mutex_unlock(&nand_mtx);

}

uint32_t nand_read_page(uint32_t bank, uint32_t page, void* databuffer,

                        void* sparebuffer, uint32_t doecc,

                        uint32_t checkempty)

{

    uint8_t* data = (uint8_t*)databuffer;

    uint8_t* spare = nand_spare;

    if (sparebuffer) spare = (uint8_t*)sparebuffer;

	if ((uint32_t)databuffer & (CACHEALIGN_SIZE - 1))

		panicf(PANIC_KILLUSERTHREADS,

	           "nand_read_page: Misaligned data buffer at %08X (bank %lu, page %lu)",

			   (unsigned int)databuffer, bank, page);

	if ((uint32_t)sparebuffer & (CACHEALIGN_SIZE - 1))

		panicf(PANIC_KILLUSERTHREADS,

	           "nand_read_page: Misaligned spare buffer at %08X (bank %lu, page %lu)",

			   (unsigned int)sparebuffer, bank, page);

    mutex_lock(&nand_mtx, TIMEOUT_BLOCK);

    nand_last_activity_value = USEC_TIMER;

    if (!nand_powered) nand_power_up();

    uint32_t rc, eccresult;

    nand_set_fmctrl0(bank, FMCTRL0_ENABLEDMA);

    if (nand_send_cmd(NAND_CMD_READ)) return nand_unlock(1);

    if (nand_send_address(page, data ? 0 : 0x800))

        return nand_unlock(1);

    if (nand_send_cmd(NAND_CMD_READ2)) return nand_unlock(1);

    if (nand_wait_status_ready(bank)) return nand_unlock(1);

    if (data)

        if (nand_transfer_data(bank, 0, data, 0x800))

            return nand_unlock(1);

    rc = 0;

    if (!doecc)

    {

        if (sparebuffer)

        {

            if (nand_transfer_data(bank, 0, spare, 0x40))

                return nand_unlock(1);

            if (sparebuffer) 

                memcpy(sparebuffer, spare, 0x800);

            if (checkempty)

                rc = nand_check_empty((uint8_t*)sparebuffer) << 1;

        }

        return nand_unlock(rc);

    }

    if (nand_transfer_data(bank, 0, spare, 0x40)) return nand_unlock(1);

    if (databuffer)

    {

        memcpy(nand_ecc, &spare[0xC], 0x28);

        rc |= (ecc_decode(3, data, nand_ecc) & 0xF) << 4;

    }

    memset(nand_ctrl, 0xFF, 0x200);

    memcpy(nand_ctrl, spare, 0xC);

    memcpy(nand_ecc, &spare[0x34], 0xC);

    eccresult = ecc_decode(0, nand_ctrl, nand_ecc);

    rc |= (eccresult & 0xF) << 8;

    if (sparebuffer)

    {

        if (eccresult & 1) memset(sparebuffer, 0xFF, 0xC);

        else memcpy(sparebuffer, nand_ctrl, 0xC);

    }

    if (checkempty) rc |= nand_check_empty(spare) << 1;

    return nand_unlock(rc);

}

static uint32_t nand_write_page_int(uint32_t bank, uint32_t page,

                                    void* databuffer, void* sparebuffer,

                                    uint32_t doecc, uint32_t wait)

{

    uint8_t* data = (uint8_t*)databuffer;

    uint8_t* spare = nand_spare;

    if (sparebuffer) spare = (uint8_t*)sparebuffer;

	if ((uint32_t)databuffer & 0xf)

		panicf(PANIC_KILLUSERTHREADS,

	           "nand_write_page: Misaligned data buffer at %08X (bank %lu, page %lu)",

			   (unsigned int)databuffer, bank, page);

	if ((uint32_t)sparebuffer & 0xf)

		panicf(PANIC_KILLUSERTHREADS,

	           "nand_write_page: Misaligned spare buffer at %08X (bank %lu, page %lu)",

			   (unsigned int)sparebuffer, bank, page);

    mutex_lock(&nand_mtx, TIMEOUT_BLOCK);

    nand_last_activity_value = USEC_TIMER;

    if (!nand_powered) nand_power_up();

    if (!sparebuffer) memset(spare, 0xFF, 0x40);

    nand_set_fmctrl0(bank, FMCTRL0_ENABLEDMA);

    if (nand_send_cmd(NAND_CMD_PROGRAM)) return nand_unlock(1);

    if (nand_send_address(page, data ? 0 : 0x800))

        return nand_unlock(1);

    if (data) nand_transfer_data_start(bank, 1, data, 0x800);

    if (doecc)

    {

        if (ecc_encode(3, data, nand_ecc)) return nand_unlock(1);

        memcpy(&spare[0xC], nand_ecc, 0x28);

        memset(nand_ctrl, 0xFF, 0x200);

        memcpy(nand_ctrl, spare, 0xC);

        if (ecc_encode(0, nand_ctrl, nand_ecc)) return nand_unlock(1);

        memcpy(&spare[0x34], nand_ecc, 0xC);

    }

    if (data)

        if (nand_transfer_data_collect(1))

            return nand_unlock(1);

    if (sparebuffer || doecc)

        if (nand_transfer_data(bank, 1, spare, 0x40))

            return nand_unlock(1);

    if (nand_send_cmd(NAND_CMD_PROGCNFRM)) return nand_unlock(1);

    if (wait) if (nand_wait_status_ready(bank)) return nand_unlock(1);

    return nand_unlock(0);

}

uint32_t nand_block_erase(uint32_t bank, uint32_t page)

{

    mutex_lock(&nand_mtx, TIMEOUT_BLOCK);

    nand_last_activity_value = USEC_TIMER;

    if (!nand_powered) nand_power_up();

    nand_set_fmctrl0(bank, 0);

    if (nand_send_cmd(NAND_CMD_BLOCKERASE)) return nand_unlock(1);

    FMANUM = 2;

    FMADDR0 = page;

    FMCTRL1 = FMCTRL1_DOTRANSADDR;

    if (nand_wait_cmddone()) return nand_unlock(1);

    if (nand_send_cmd(NAND_CMD_ERASECNFRM)) return nand_unlock(1);

    if (nand_wait_status_ready(bank)) return nand_unlock(1);

    return nand_unlock(0);

}

uint32_t nand_read_page_fast(uint32_t page, void* databuffer,

                             void* sparebuffer, uint32_t doecc,

                             uint32_t checkempty)

{

    uint32_t i, rc = 0;

    if (((uint32_t)databuffer & 0xf) || ((uint32_t)sparebuffer & 0xf)

     || !databuffer || !sparebuffer || !doecc)

    {

        for (i = 0; i < 4; i++)

        {

            if (nand_type[i] < 0) continue;

            void* databuf = (void*)0;

            void* sparebuf = (void*)0;

            if (databuffer) databuf = (void*)((uint32_t)databuffer + 0x800 * i);

            if (sparebuffer) sparebuf = (void*)((uint32_t)sparebuffer + 0x40 * i);

            uint32_t ret = nand_read_page(i, page, databuf, sparebuf, doecc, checkempty);

            if (ret & 1) rc |= 1 << (i << 2);

            if (ret & 2) rc |= 2 << (i << 2);

            if (ret & 0x10) rc |= 4 << (i << 2);

            if (ret & 0x100) rc |= 8 << (i << 2);

        }

        return rc;

    }

    mutex_lock(&nand_mtx, TIMEOUT_BLOCK);

    nand_last_activity_value = USEC_TIMER;

    if (!nand_powered) nand_power_up();

    uint8_t status[4];

    for (i = 0; i < 4; i++) status[i] = (nand_type[i] < 0);

    for (i = 0; i < 4; i++)

    {

        if (!status[i])

        {

            nand_set_fmctrl0(i, FMCTRL0_ENABLEDMA);

            if (nand_send_cmd(NAND_CMD_READ))

                status[i] = 1;

        }

        if (!status[i])

            if (nand_send_address(page, 0))

                status[i] = 1;

        if (!status[i])

            if (nand_send_cmd(NAND_CMD_READ2))

                status[i] = 1;

    }

    if (!status[0])

        if (nand_wait_status_ready(0))

            status[0] = 1;

    if (!status[0])

        if (nand_transfer_data(0, 0, databuffer, 0x800))

            status[0] = 1;

    if (!status[0])

        if (nand_transfer_data(0, 0, sparebuffer, 0x40))

            status[0] = 1;

    for (i = 1; i < 4; i++)

    {

        if (!status[i])

            if (nand_wait_status_ready(i))

                status[i] = 1;

        if (!status[i])

            nand_transfer_data_start(i, 0, (void*)((uint32_t)databuffer

                                                 + 0x800 * i), 0x800);

        if (!status[i - 1])

        {

            memcpy(nand_ecc, (void*)((uint32_t)sparebuffer + 0x40 * (i - 1) + 0xC), 0x28);

            ecc_start(3, (void*)((uint32_t)databuffer

                               + 0x800 * (i - 1)), nand_ecc, ECCCTRL_STARTDECODING);

        }

        if (!status[i])

            if (nand_transfer_data_collect(0))

                status[i] = 1;

        if (!status[i])

            nand_transfer_data_start(i, 0, (void*)((uint32_t)sparebuffer

                                                 + 0x40 * i), 0x40);

        if (!status[i - 1])

            if (ecc_collect() & 1)

                status[i - 1] = 4;

        if (!status[i - 1])

        {

            memset(nand_ctrl, 0xFF, 0x200);

            memcpy(nand_ctrl, (void*)((uint32_t)sparebuffer + 0x40 * (i - 1)), 0xC);

            memcpy(nand_ecc, (void*)((uint32_t)sparebuffer + 0x40 * (i - 1) + 0x34), 0xC);

            ecc_start(0, nand_ctrl, nand_ecc, ECCCTRL_STARTDECODING);

        }

        if (!status[i])

            if (nand_transfer_data_collect(0))

                status[i] = 1;

        if (!status[i - 1])

        {

            if (ecc_collect() & 1)

            {

                status[i - 1] |= 8;

                memset((void*)((uint32_t)sparebuffer + 0x40 * (i - 1)), 0xFF, 0xC);

            }

            else memcpy((void*)((uint32_t)sparebuffer + 0x40 * (i - 1)), nand_ctrl, 0xC);

            if (checkempty)

                status[i - 1] |= nand_check_empty((void*)((uint32_t)sparebuffer

                                                        + 0x40 * (i - 1))) << 1;

        }

    }

    if (!status[i - 1])

    {

        memcpy(nand_ecc,(void*)((uint32_t)sparebuffer + 0x40 * (i - 1) + 0xC), 0x28);

        if (ecc_decode(3, (void*)((uint32_t)databuffer

                                + 0x800 * (i - 1)), nand_ecc) & 1)

            status[i - 1] = 4;

    }

    if (!status[i - 1])

    {

        memset(nand_ctrl, 0xFF, 0x200);

        memcpy(nand_ctrl, (void*)((uint32_t)sparebuffer + 0x40 * (i - 1)), 0xC);

        memcpy(nand_ecc, (void*)((uint32_t)sparebuffer + 0x40 * (i - 1) + 0x34), 0xC);

        if (ecc_decode(0, nand_ctrl, nand_ecc) & 1)

        {

            status[i - 1] |= 8;

            memset((void*)((uint32_t)sparebuffer + 0x40 * (i - 1)), 0xFF, 0xC);

        }

        else memcpy((void*)((uint32_t)sparebuffer + 0x40 * (i - 1)), nand_ctrl, 0xC);

        if (checkempty)

            status[i - 1] |= nand_check_empty((void*)((uint32_t)sparebuffer

                                                    + 0x40 * (i - 1))) << 1;

    }

    for (i = 0; i < 4; i++)

        if (nand_type[i] < 0)

            rc |= status[i] << (i << 2);

    return nand_unlock(rc);

}

uint32_t nand_write_page(uint32_t bank, uint32_t page, void* databuffer,

                         void* sparebuffer, uint32_t doecc)

{

    return nand_write_page_int(bank, page, databuffer, sparebuffer, doecc, 1);

}

uint32_t nand_write_page_start(uint32_t bank, uint32_t page, void* databuffer,

                               void* sparebuffer, uint32_t doecc)

{

    if (((uint32_t)databuffer & 0xf) || ((uint32_t)sparebuffer & 0xf)

     || !databuffer || !sparebuffer || !doecc || !nand_interleaved)

        return nand_write_page_int(bank, page, databuffer, sparebuffer, doecc, !nand_interleaved);

    mutex_lock(&nand_mtx, TIMEOUT_BLOCK);

    nand_last_activity_value = USEC_TIMER;

    if (!nand_powered) nand_power_up();

    nand_set_fmctrl0(bank, FMCTRL0_ENABLEDMA);

    if (nand_send_cmd(NAND_CMD_PROGRAM))

        return nand_unlock(1);

    if (nand_send_address(page, 0))

        return nand_unlock(1);

    nand_transfer_data_start(bank, 1, databuffer, 0x800);

    if (ecc_encode(3, databuffer, nand_ecc))

        return nand_unlock(1);

    memcpy((void*)((uint32_t)sparebuffer + 0xC), nand_ecc, 0x28);

    memset(nand_ctrl, 0xFF, 0x200);

    memcpy(nand_ctrl, sparebuffer, 0xC);

    if (ecc_encode(0, nand_ctrl, nand_ecc))

        return nand_unlock(1);

    memcpy((void*)((uint32_t)sparebuffer + 0x34), nand_ecc, 0xC);

    if (nand_transfer_data_collect(0))

        return nand_unlock(1);

    if (nand_transfer_data(bank, 1, sparebuffer, 0x40))

        return nand_unlock(1);

    return nand_unlock(nand_send_cmd(NAND_CMD_PROGCNFRM));

}

uint32_t nand_write_page_collect(uint32_t bank)

{

    return nand_wait_status_ready(bank);

}

static uint32_t nand_block_erase_fast(uint32_t page)

{

    uint32_t i, rc = 0;

    mutex_lock(&nand_mtx, TIMEOUT_BLOCK);

    nand_last_activity_value = USEC_TIMER;

    if (!nand_powered) nand_power_up();

    for (i = 0; i < 4; i++)

    {

        if (nand_type[i] < 0) continue;

        nand_set_fmctrl0(i, 0);

        if (nand_send_cmd(NAND_CMD_BLOCKERASE))

        {

            rc |= 1 << i;

            continue;

        }

        FMANUM = 2;

        FMADDR0 = page;

        FMCTRL1 = FMCTRL1_DOTRANSADDR;

        if (nand_wait_cmddone())

        {

            rc |= 1 << i;

            continue;

        }

        if (nand_send_cmd(NAND_CMD_ERASECNFRM)) rc |= 1 << i;

    }

    for (i = 0; i < 4; i++)

    {

        if (nand_type[i] < 0) continue;

        if (rc & (1 << i)) continue;

        if (nand_wait_status_ready(i)) rc |= 1 << i;

    }

    return nand_unlock(rc);

}

const struct nand_device_info_type* nand_get_device_type(uint32_t bank)

{

    if (nand_type[bank] < 0)

        return (struct nand_device_info_type*)0;

    return &nand_deviceinfotable[nand_type[bank]];

}

static void nand_thread(void)

{

    while (1)

    {

        if (TIME_AFTER(USEC_TIMER, nand_last_activity_value + 200000) && nand_powered)

            nand_power_down();

        sleep(100000);

    }

}

int nand_device_init(void)

{

    mutex_init(&nand_mtx);

    wakeup_init(&nand_wakeup);

    mutex_init(&ecc_mtx);

    wakeup_init(&ecc_wakeup);

    uint32_t type;

    uint32_t i, j;

    /* Assume there are 0 banks, to prevent

       nand_power_up from talking with them yet. */

    for (i = 0; i < 4; i++) nand_type[i] = -1;

    nand_power_up();

    /* Now that the flash is powered on, detect how

       many banks we really have and initialize them. */

    for (i = 0; i < 4; i++)

    {

        nand_tunk1[i] = 7;

        nand_twp[i] = 7;

        nand_tunk2[i] = 7;

        nand_tunk3[i] = 7;

        type = nand_get_chip_type(i);

        if (type >= 0xFFFFFFF0)

        {

            nand_type[i] = (int)type;

            continue;

        }

        for (j = 0; ; j++)

        {

            if (j == ARRAYLEN(nand_deviceinfotable)) break;

            else if (nand_deviceinfotable[j].id == type)

            {

                nand_type[i] = j;

                break;

            }

        }

        nand_tunk1[i] = nand_deviceinfotable[nand_type[i]].tunk1;

        nand_twp[i] = nand_deviceinfotable[nand_type[i]].twp;

        nand_tunk2[i] = nand_deviceinfotable[nand_type[i]].tunk2;

        nand_tunk3[i] = nand_deviceinfotable[nand_type[i]].tunk3;

    }

    if (nand_type[0] < 0) return nand_type[0];

    nand_interleaved = ((nand_type[0] >> 22) & 1);

    nand_cached = ((nand_type[0] >> 23) & 1);

    nand_last_activity_value = USEC_TIMER;

    thread_create("NAND idle monitor", nand_thread, nand_stack,

                  sizeof(nand_stack), USER_THREAD, 1, true);

    return 0;

}