lpc3180.c

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// SPDX-License-Identifier: GPL-2.0-or-later
 
/***************************************************************************
 *   Copyright (C) 2007 by Dominic Rath                                    *
 *   Dominic.Rath@gmx.de                                                   *
 *
 *   Copyright (C) 2010 richard vegh <vegh.ricsi@gmail.com>                *
 *   Copyright (C) 2010 Oyvind Harboe <oyvind.harboe@zylin.com>            *
 ***************************************************************************/
 
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
 
#include "imp.h"
#include "lpc3180.h"
#include <target/target.h>
 
static int lpc3180_reset(struct nand_device *nand);
static int lpc3180_controller_ready(struct nand_device *nand, int timeout);
static int lpc3180_tc_ready(struct nand_device *nand, int timeout);
 
#define ECC_OFFS   0x120
#define SPARE_OFFS 0x140
#define DATA_OFFS   0x200
 
/* nand device lpc3180 <target#> <oscillator_frequency>
 */
NAND_DEVICE_COMMAND_HANDLER(lpc3180_nand_device_command)
{
    if (CMD_ARGC < 3)
        return ERROR_COMMAND_SYNTAX_ERROR;
 
    uint32_t osc_freq;
    COMMAND_PARSE_NUMBER(u32, CMD_ARGV[2], osc_freq);
 
    struct lpc3180_nand_controller *lpc3180_info;
    lpc3180_info = malloc(sizeof(struct lpc3180_nand_controller));
    nand->controller_priv = lpc3180_info;
 
    lpc3180_info->osc_freq = osc_freq;
 
    if ((lpc3180_info->osc_freq < 1000) || (lpc3180_info->osc_freq > 20000))
        LOG_WARNING(
            "LPC3180 oscillator frequency should be between 1000 and 20000 kHz, was %i",
            lpc3180_info->osc_freq);
    lpc3180_info->selected_controller = LPC3180_NO_CONTROLLER;
    lpc3180_info->sw_write_protection = 0;
    lpc3180_info->sw_wp_lower_bound = 0x0;
    lpc3180_info->sw_wp_upper_bound = 0x0;
 
    return ERROR_OK;
}
 
static int lpc3180_pll(int fclkin, uint32_t pll_ctrl)
{
    int bypass = (pll_ctrl & 0x8000) >> 15;
    int direct = (pll_ctrl & 0x4000) >> 14;
    int feedback = (pll_ctrl & 0x2000) >> 13;
    int p = (1 << ((pll_ctrl & 0x1800) >> 11) * 2);
    int n = ((pll_ctrl & 0x0600) >> 9) + 1;
    int m = ((pll_ctrl & 0x01fe) >> 1) + 1;
    int lock = (pll_ctrl & 0x1);
 
    if (!lock)
        LOG_WARNING("PLL is not locked");
 
    if (!bypass && direct)  /* direct mode */
        return (m * fclkin) / n;
 
    if (bypass && !direct)  /* bypass mode */
        return fclkin / (2 * p);
 
    if (bypass & direct)    /* direct bypass mode */
        return fclkin;
 
    if (feedback)           /* integer mode */
        return m * (fclkin / n);
    else                    /* non-integer mode */
        return (m / (2 * p)) * (fclkin / n);
}
 
static float lpc3180_cycle_time(struct nand_device *nand)
{
    struct lpc3180_nand_controller *lpc3180_info = nand->controller_priv;
    struct target *target = nand->target;
    uint32_t sysclk_ctrl, pwr_ctrl, hclkdiv_ctrl, hclkpll_ctrl;
    int sysclk;
    int hclk;
    int hclk_pll;
    float cycle;
 
    /* calculate timings */
 
    /* determine current SYSCLK (13'MHz or main oscillator) */
    target_read_u32(target, 0x40004050, &sysclk_ctrl);
 
    if ((sysclk_ctrl & 1) == 0)
        sysclk = lpc3180_info->osc_freq;
    else
        sysclk = 13000;
 
    /* determine selected HCLK source */
    target_read_u32(target, 0x40004044, &pwr_ctrl);
 
    if ((pwr_ctrl & (1 << 2)) == 0) /* DIRECT RUN mode */
        hclk = sysclk;
    else {
        target_read_u32(target, 0x40004058, &hclkpll_ctrl);
        hclk_pll = lpc3180_pll(sysclk, hclkpll_ctrl);
 
        target_read_u32(target, 0x40004040, &hclkdiv_ctrl);
 
        if (pwr_ctrl & (1 << 10)) /* ARM_CLK and HCLK use PERIPH_CLK */
            hclk = hclk_pll / (((hclkdiv_ctrl & 0x7c) >> 2) + 1);
        else /* HCLK uses HCLK_PLL */
            hclk = hclk_pll / (1 << (hclkdiv_ctrl & 0x3));
    }
 
    LOG_DEBUG("LPC3180 HCLK currently clocked at %i kHz", hclk);
 
    cycle = (1.0 / hclk) * 1000000.0;
 
    return cycle;
}
 
static int lpc3180_init(struct nand_device *nand)
{
    struct lpc3180_nand_controller *lpc3180_info = nand->controller_priv;
    struct target *target = nand->target;
    int bus_width = nand->bus_width ? nand->bus_width : 8;
    int address_cycles = nand->address_cycles ? nand->address_cycles : 3;
    int page_size = nand->page_size ? nand->page_size : 512;
 
    if (target->state != TARGET_HALTED) {
        LOG_ERROR("target must be halted to use LPC3180 NAND flash controller");
        return ERROR_NAND_OPERATION_FAILED;
    }
 
    /* sanitize arguments */
    if ((bus_width != 8) && (bus_width != 16)) {
        LOG_ERROR("LPC3180 only supports 8 or 16 bit bus width, not %i", bus_width);
        return ERROR_NAND_OPERATION_NOT_SUPPORTED;
    }
 
    /* The LPC3180 only brings out 8 bit NAND data bus, but the controller
     * would support 16 bit, too, so we just warn about this for now
     */
    if (bus_width == 16)
        LOG_WARNING("LPC3180 only supports 8 bit bus width");
 
    /* inform calling code about selected bus width */
    nand->bus_width = bus_width;
 
    if ((address_cycles != 3) && (address_cycles != 4)) {
        LOG_ERROR("LPC3180 only supports 3 or 4 address cycles, not %i", address_cycles);
        return ERROR_NAND_OPERATION_NOT_SUPPORTED;
    }
 
    if ((page_size != 512) && (page_size != 2048)) {
        LOG_ERROR("LPC3180 only supports 512 or 2048 byte pages, not %i", page_size);
        return ERROR_NAND_OPERATION_NOT_SUPPORTED;
    }
 
    /* select MLC controller if none is currently selected */
    if (lpc3180_info->selected_controller == LPC3180_NO_CONTROLLER) {
        LOG_DEBUG("no LPC3180 NAND flash controller selected, using default 'mlc'");
        lpc3180_info->selected_controller = LPC3180_MLC_CONTROLLER;
    }
 
    if (lpc3180_info->selected_controller == LPC3180_MLC_CONTROLLER) {
        uint32_t mlc_icr_value = 0x0;
        float cycle;
        int twp, twh, trp, treh, trhz, trbwb, tcea;
 
        /* FLASHCLK_CTRL = 0x22 (enable clock for MLC flash controller) */
        target_write_u32(target, 0x400040c8, 0x22);
 
        /* MLC_CEH = 0x0 (Force nCE assert) */
        target_write_u32(target, 0x200b804c, 0x0);
 
        /* MLC_LOCK = 0xa25e (unlock protected registers) */
        target_write_u32(target, 0x200b8044, 0xa25e);
 
        /* MLC_ICR = configuration */
        if (lpc3180_info->sw_write_protection)
            mlc_icr_value |= 0x8;
        if (page_size == 2048)
            mlc_icr_value |= 0x4;
        if (address_cycles == 4)
            mlc_icr_value |= 0x2;
        if (bus_width == 16)
            mlc_icr_value |= 0x1;
        target_write_u32(target, 0x200b8030, mlc_icr_value);
 
        /* calculate NAND controller timings */
        cycle = lpc3180_cycle_time(nand);
 
        twp = ((40 / cycle) + 1);
        twh = ((20 / cycle) + 1);
        trp = ((30 / cycle) + 1);
        treh = ((15 / cycle) + 1);
        trhz = ((30 / cycle) + 1);
        trbwb = ((100 / cycle) + 1);
        tcea = ((45 / cycle) + 1);
 
        /* MLC_LOCK = 0xa25e (unlock protected registers) */
        target_write_u32(target, 0x200b8044, 0xa25e);
 
        /* MLC_TIME_REG */
        target_write_u32(target, 0x200b8034, (twp & 0xf) | ((twh & 0xf) << 4) |
            ((trp & 0xf) << 8) | ((treh & 0xf) << 12) | ((trhz & 0x7) << 16) |
            ((trbwb & 0x1f) << 19) | ((tcea & 0x3) << 24));
 
        lpc3180_reset(nand);
    } else if (lpc3180_info->selected_controller == LPC3180_SLC_CONTROLLER) {
        float cycle;
        int r_setup, r_hold, r_width, r_rdy;
        int w_setup, w_hold, w_width, w_rdy;
 
        /* FLASHCLK_CTRL = 0x05 (enable clock for SLC flash controller) */
        target_write_u32(target, 0x400040c8, 0x05);
 
        /* after reset set other registers of SLC so reset calling is here at the beginning */
        lpc3180_reset(nand);
 
        /* SLC_CFG = 0x (Force nCE assert, DMA ECC enabled, ECC enabled, DMA burst enabled,
         *DMA read from SLC, WIDTH = bus_width) */
        target_write_u32(target, 0x20020014, 0x3e | ((bus_width == 16) ? 1 : 0));
 
        /* SLC_IEN = 3 (INT_RDY_EN = 1) ,(INT_TC_STAT = 1) */
        target_write_u32(target, 0x20020020, 0x03);
 
        /* DMA configuration
         * DMACLK_CTRL = 0x01 (enable clock for DMA controller) */
        target_write_u32(target, 0x400040e8, 0x01);
        /* DMACConfig = DMA enabled*/
        target_write_u32(target, 0x31000030, 0x01);
 
 
        /* calculate NAND controller timings */
        cycle = lpc3180_cycle_time(nand);
 
        r_setup = w_setup = 0;
        r_hold = w_hold = 10 / cycle;
        r_width = 30 / cycle;
        w_width = 40 / cycle;
        r_rdy = w_rdy = 100 / cycle;
 
        /* SLC_TAC: SLC timing arcs register */
        target_write_u32(target, 0x2002002c, (r_setup & 0xf) | ((r_hold & 0xf) << 4) |
            ((r_width & 0xf) << 8) | ((r_rdy & 0xf) << 12) |  ((w_setup & 0xf) << 16) |
            ((w_hold & 0xf) << 20) | ((w_width & 0xf) << 24) | ((w_rdy & 0xf) << 28));
 
    }
 
    return ERROR_OK;
}
 
static int lpc3180_reset(struct nand_device *nand)
{
    struct lpc3180_nand_controller *lpc3180_info = nand->controller_priv;
    struct target *target = nand->target;
 
    if (target->state != TARGET_HALTED) {
        LOG_ERROR("target must be halted to use LPC3180 NAND flash controller");
        return ERROR_NAND_OPERATION_FAILED;
    }
 
    if (lpc3180_info->selected_controller == LPC3180_NO_CONTROLLER) {
        LOG_ERROR("BUG: no LPC3180 NAND flash controller selected");
        return ERROR_NAND_OPERATION_FAILED;
    } else if (lpc3180_info->selected_controller == LPC3180_MLC_CONTROLLER) {
        /* MLC_CMD = 0xff (reset controller and NAND device) */
        target_write_u32(target, 0x200b8000, 0xff);
 
        if (!lpc3180_controller_ready(nand, 100)) {
            LOG_ERROR("LPC3180 NAND controller timed out after reset");
            return ERROR_NAND_OPERATION_TIMEOUT;
        }
    } else if (lpc3180_info->selected_controller == LPC3180_SLC_CONTROLLER) {
        /* SLC_CTRL = 0x6 (ECC_CLEAR, SW_RESET) */
        target_write_u32(target, 0x20020010, 0x6);
 
        if (!lpc3180_controller_ready(nand, 100)) {
            LOG_ERROR("LPC3180 NAND controller timed out after reset");
            return ERROR_NAND_OPERATION_TIMEOUT;
        }
    }
 
    return ERROR_OK;
}
 
static int lpc3180_command(struct nand_device *nand, uint8_t command)
{
    struct lpc3180_nand_controller *lpc3180_info = nand->controller_priv;
    struct target *target = nand->target;
 
    if (target->state != TARGET_HALTED) {
        LOG_ERROR("target must be halted to use LPC3180 NAND flash controller");
        return ERROR_NAND_OPERATION_FAILED;
    }
 
    if (lpc3180_info->selected_controller == LPC3180_NO_CONTROLLER) {
        LOG_ERROR("BUG: no LPC3180 NAND flash controller selected");
        return ERROR_NAND_OPERATION_FAILED;
    } else if (lpc3180_info->selected_controller == LPC3180_MLC_CONTROLLER) {
        /* MLC_CMD = command */
        target_write_u32(target, 0x200b8000, command);
    } else if (lpc3180_info->selected_controller == LPC3180_SLC_CONTROLLER) {
        /* SLC_CMD = command */
        target_write_u32(target, 0x20020008, command);
    }
 
    return ERROR_OK;
}
 
static int lpc3180_address(struct nand_device *nand, uint8_t address)
{
    struct lpc3180_nand_controller *lpc3180_info = nand->controller_priv;
    struct target *target = nand->target;
 
    if (target->state != TARGET_HALTED) {
        LOG_ERROR("target must be halted to use LPC3180 NAND flash controller");
        return ERROR_NAND_OPERATION_FAILED;
    }
 
    if (lpc3180_info->selected_controller == LPC3180_NO_CONTROLLER) {
        LOG_ERROR("BUG: no LPC3180 NAND flash controller selected");
        return ERROR_NAND_OPERATION_FAILED;
    } else if (lpc3180_info->selected_controller == LPC3180_MLC_CONTROLLER) {
        /* MLC_ADDR = address */
        target_write_u32(target, 0x200b8004, address);
    } else if (lpc3180_info->selected_controller == LPC3180_SLC_CONTROLLER) {
        /* SLC_ADDR = address */
        target_write_u32(target, 0x20020004, address);
    }
 
    return ERROR_OK;
}
 
static int lpc3180_write_data(struct nand_device *nand, uint16_t data)
{
    struct lpc3180_nand_controller *lpc3180_info = nand->controller_priv;
    struct target *target = nand->target;
 
    if (target->state != TARGET_HALTED) {
        LOG_ERROR("target must be halted to use LPC3180 NAND flash controller");
        return ERROR_NAND_OPERATION_FAILED;
    }
 
    if (lpc3180_info->selected_controller == LPC3180_NO_CONTROLLER) {
        LOG_ERROR("BUG: no LPC3180 NAND flash controller selected");
        return ERROR_NAND_OPERATION_FAILED;
    } else if (lpc3180_info->selected_controller == LPC3180_MLC_CONTROLLER) {
        /* MLC_DATA = data */
        target_write_u32(target, 0x200b0000, data);
    } else if (lpc3180_info->selected_controller == LPC3180_SLC_CONTROLLER) {
        /* SLC_DATA = data */
        target_write_u32(target, 0x20020000, data);
    }
 
    return ERROR_OK;
}
 
static int lpc3180_read_data(struct nand_device *nand, void *data)
{
    struct lpc3180_nand_controller *lpc3180_info = nand->controller_priv;
    struct target *target = nand->target;
 
    if (target->state != TARGET_HALTED) {
        LOG_ERROR("target must be halted to use LPC3180 NAND flash controller");
        return ERROR_NAND_OPERATION_FAILED;
    }
 
    if (lpc3180_info->selected_controller == LPC3180_NO_CONTROLLER) {
        LOG_ERROR("BUG: no LPC3180 NAND flash controller selected");
        return ERROR_NAND_OPERATION_FAILED;
    } else if (lpc3180_info->selected_controller == LPC3180_MLC_CONTROLLER) {
        /* data = MLC_DATA, use sized access */
        if (nand->bus_width == 8) {
            uint8_t *data8 = data;
            target_read_u8(target, 0x200b0000, data8);
        } else if (nand->bus_width == 16) {
            uint16_t *data16 = data;
            target_read_u16(target, 0x200b0000, data16);
        } else {
            LOG_ERROR("BUG: bus_width neither 8 nor 16 bit");
            return ERROR_NAND_OPERATION_FAILED;
        }
    } else if (lpc3180_info->selected_controller == LPC3180_SLC_CONTROLLER) {
        uint32_t data32;
 
        /* data = SLC_DATA, must use 32-bit access */
        target_read_u32(target, 0x20020000, &data32);
 
        if (nand->bus_width == 8) {
            uint8_t *data8 = data;
            *data8 = data32 & 0xff;
        } else if (nand->bus_width == 16) {
            uint16_t *data16 = data;
            *data16 = data32 & 0xffff;
        } else {
            LOG_ERROR("BUG: bus_width neither 8 nor 16 bit");
            return ERROR_NAND_OPERATION_FAILED;
        }
    }
 
    return ERROR_OK;
}
 
static int lpc3180_write_page(struct nand_device *nand,
    uint32_t page,
    uint8_t *data,
    uint32_t data_size,
    uint8_t *oob,
    uint32_t oob_size)
{
    struct lpc3180_nand_controller *lpc3180_info = nand->controller_priv;
    struct target *target = nand->target;
    int retval;
    uint8_t status;
    uint8_t *page_buffer;
 
    if (target->state != TARGET_HALTED) {
        LOG_ERROR("target must be halted to use LPC3180 NAND flash controller");
        return ERROR_NAND_OPERATION_FAILED;
    }
 
    if (lpc3180_info->selected_controller == LPC3180_NO_CONTROLLER) {
        LOG_ERROR("BUG: no LPC3180 NAND flash controller selected");
        return ERROR_NAND_OPERATION_FAILED;
    } else if (lpc3180_info->selected_controller == LPC3180_MLC_CONTROLLER) {
        uint8_t *oob_buffer;
        int quarter, num_quarters;
 
        if (!data && oob) {
            LOG_ERROR("LPC3180 MLC controller can't write OOB data only");
            return ERROR_NAND_OPERATION_NOT_SUPPORTED;
        }
 
        if (oob && (oob_size > 24)) {
            LOG_ERROR("LPC3180 MLC controller can't write more "
                "than 6 bytes for each quarter's OOB data");
            return ERROR_NAND_OPERATION_NOT_SUPPORTED;
        }
 
        if (data_size > (uint32_t)nand->page_size) {
            LOG_ERROR("data size exceeds page size");
            return ERROR_NAND_OPERATION_NOT_SUPPORTED;
        }
 
        /* MLC_CMD = sequential input */
        target_write_u32(target, 0x200b8000, NAND_CMD_SEQIN);
 
        page_buffer = malloc(512);
        oob_buffer = malloc(6);
 
        if (nand->page_size == 512) {
            /* MLC_ADDR = 0x0 (one column cycle) */
            target_write_u32(target, 0x200b8004, 0x0);
 
            /* MLC_ADDR = row */
            target_write_u32(target, 0x200b8004, page & 0xff);
            target_write_u32(target, 0x200b8004, (page >> 8) & 0xff);
 
            if (nand->address_cycles == 4)
                target_write_u32(target, 0x200b8004, (page >> 16) & 0xff);
        } else {
            /* MLC_ADDR = 0x0 (two column cycles) */
            target_write_u32(target, 0x200b8004, 0x0);
            target_write_u32(target, 0x200b8004, 0x0);
 
            /* MLC_ADDR = row */
            target_write_u32(target, 0x200b8004, page & 0xff);
            target_write_u32(target, 0x200b8004, (page >> 8) & 0xff);
        }
 
        /* when using the MLC controller, we have to treat a large page device
         * as being made out of four quarters, each the size of a small page device
         */
        num_quarters = (nand->page_size == 2048) ? 4 : 1;
 
        for (quarter = 0; quarter < num_quarters; quarter++) {
            int thisrun_data_size = (data_size > 512) ? 512 : data_size;
            int thisrun_oob_size = (oob_size > 6) ? 6 : oob_size;
 
            memset(page_buffer, 0xff, 512);
            if (data) {
                memcpy(page_buffer, data, thisrun_data_size);
                data_size -= thisrun_data_size;
                data += thisrun_data_size;
            }
 
            memset(oob_buffer, 0xff, 6);
            if (oob) {
                memcpy(oob_buffer, oob, thisrun_oob_size);
                oob_size -= thisrun_oob_size;
                oob += thisrun_oob_size;
            }
 
            /* write MLC_ECC_ENC_REG to start encode cycle */
            target_write_u32(target, 0x200b8008, 0x0);
 
            target_write_memory(target, 0x200a8000,
                4, 128, page_buffer);
            target_write_memory(target, 0x200a8000,
                1, 6, oob_buffer);
 
            /* write MLC_ECC_AUTO_ENC_REG to start auto encode */
            target_write_u32(target, 0x200b8010, 0x0);
 
            if (!lpc3180_controller_ready(nand, 1000)) {
                LOG_ERROR("timeout while waiting for completion of auto encode cycle");
                free(page_buffer);
                free(oob_buffer);
                return ERROR_NAND_OPERATION_FAILED;
            }
        }
 
        /* MLC_CMD = auto program command */
        target_write_u32(target, 0x200b8000, NAND_CMD_PAGEPROG);
 
        retval = nand_read_status(nand, &status);
        if (retval != ERROR_OK) {
            LOG_ERROR("couldn't read status");
            free(page_buffer);
            free(oob_buffer);
            return ERROR_NAND_OPERATION_FAILED;
        }
 
        if (status & NAND_STATUS_FAIL) {
            LOG_ERROR("write operation didn't pass, status: 0x%2.2x", status);
            free(page_buffer);
            free(oob_buffer);
            return ERROR_NAND_OPERATION_FAILED;
        }
 
        free(page_buffer);
        free(oob_buffer);
    } else if (lpc3180_info->selected_controller == LPC3180_SLC_CONTROLLER) {
 
        /**********************************************************************
        *     Write both SLC NAND flash page main area and spare area.
        *     Small page -
        *      ------------------------------------------
        *     |    512 bytes main   |   16 bytes spare   |
        *      ------------------------------------------
        *     Large page -
        *      ------------------------------------------
        *     |   2048 bytes main   |   64 bytes spare   |
        *      ------------------------------------------
        *     If DMA & ECC enabled, then the ECC generated for the 1st 256-byte
        *     data is written to the 3rd word of the spare area. The ECC
        *     generated for the 2nd 256-byte data is written to the 4th word
        *     of the spare area. The ECC generated for the 3rd 256-byte data is
        *     written to the 7th word of the spare area. The ECC generated
        *     for the 4th 256-byte data is written to the 8th word of the
        *     spare area and so on.
        *
        **********************************************************************/
 
        int i = 0, target_mem_base;
        uint8_t *ecc_flash_buffer;
        struct working_area *pworking_area;
 
        if (lpc3180_info->is_bulk) {
 
            if (!data && oob) {
                /*if oob only mode is active original method is used as SLC
                 *controller hangs during DMA interworking. Anyway the code supports
                 *the oob only mode below. */
                return nand_write_page_raw(nand,
                    page,
                    data,
                    data_size,
                    oob,
                    oob_size);
            }
            retval = nand_page_command(nand, page, NAND_CMD_SEQIN, !data);
            if (retval != ERROR_OK)
                return retval;
 
            /* allocate a working area */
            if (target->working_area_size < (uint32_t) nand->page_size + 0x200) {
                LOG_ERROR("Reserve at least 0x%x physical target working area",
                    nand->page_size + 0x200);
                return ERROR_FLASH_OPERATION_FAILED;
            }
            if (target->working_area_phys%4) {
                LOG_ERROR(
                    "Reserve the physical target working area at word boundary");
                return ERROR_FLASH_OPERATION_FAILED;
            }
            if (target_alloc_working_area(target, target->working_area_size,
                    &pworking_area) != ERROR_OK) {
                LOG_ERROR("no working area specified, can't read LPC internal flash");
                return ERROR_FLASH_OPERATION_FAILED;
            }
            target_mem_base = target->working_area_phys;
 
            if (nand->page_size == 2048)
                page_buffer = malloc(2048);
            else
                page_buffer = malloc(512);
 
            ecc_flash_buffer = malloc(64);
 
            /* SLC_CFG = 0x (Force nCE assert, DMA ECC enabled, ECC enabled, DMA burst
             *enabled, DMA write to SLC, WIDTH = bus_width) */
            target_write_u32(target, 0x20020014, 0x3c);
 
            if (data && !oob) {
                /* set DMA LLI-s in target memory and in DMA*/
                for (i = 0; i < nand->page_size/0x100; i++) {
 
                    int tmp;
                    /* -------LLI for 256 byte block---------
                     * DMACC0SrcAddr = SRAM */
                    target_write_u32(target,
                        target_mem_base+0+i*32,
                        target_mem_base+DATA_OFFS+i*256);
                    if (i == 0)
                        target_write_u32(target,
                            0x31000100,
                            target_mem_base+DATA_OFFS);
                    /* DMACCxDestAddr = SLC_DMA_DATA */
                    target_write_u32(target, target_mem_base+4+i*32, 0x20020038);
                    if (i == 0)
                        target_write_u32(target, 0x31000104, 0x20020038);
                    /* DMACCxLLI = next element */
                    tmp = (target_mem_base+(1+i*2)*16)&0xfffffffc;
                    target_write_u32(target, target_mem_base+8+i*32, tmp);
                    if (i == 0)
                        target_write_u32(target, 0x31000108, tmp);
                    /* DMACCxControl =  TransferSize =64, Source burst size =16,
                     * Destination burst size = 16, Source transfer width = 32 bit,
                     * Destination transfer width = 32 bit, Source AHB master select = M0,
                     * Destination AHB master select = M0, Source increment = 1,
                     * Destination increment = 0, Terminal count interrupt enable bit = 0*/
                    target_write_u32(target,
                        target_mem_base+12+i*32,
                        0x40 | 3<<12 | 3<<15 | 2<<18 | 2<<21 | 0<<24 | 0<<25 | 1<<26 |
                        0<<27 | 0<<31);
                    if (i == 0)
                        target_write_u32(target,
                            0x3100010c,
                            0x40 | 3<<12 | 3<<15 | 2<<18 | 2<<21 | 0<<24 | 0<<25 | 1<<26 |
                            0<<27 | 0<<31);
 
                    /* -------LLI for 3 byte ECC---------
                     * DMACC0SrcAddr = SLC_ECC*/
                    target_write_u32(target, target_mem_base+16+i*32, 0x20020034);
                    /* DMACCxDestAddr = SRAM */
                    target_write_u32(target,
                        target_mem_base+20+i*32,
                        target_mem_base+SPARE_OFFS+8+16*(i>>1)+(i%2)*4);
                    /* DMACCxLLI = next element */
                    tmp = (target_mem_base+(2+i*2)*16)&0xfffffffc;
                    target_write_u32(target, target_mem_base+24+i*32, tmp);
                    /* DMACCxControl =  TransferSize =1, Source burst size =4,
                     * Destination burst size = 4, Source transfer width = 32 bit,
                     * Destination transfer width = 32 bit, Source AHB master select = M0,
                     * Destination AHB master select = M0, Source increment = 0,
                     * Destination increment = 1, Terminal count interrupt enable bit = 0*/
                    target_write_u32(target,
                        target_mem_base+28+i*32,
                        0x01 | 1<<12 | 1<<15 | 2<<18 | 2<<21 | 0<<24 | 0<<25 | 0<<26 | 1<<27 | 0<<
                        31);
                }
            } else if (data && oob) {
                /* -------LLI for 512 or 2048 bytes page---------
                 * DMACC0SrcAddr = SRAM */
                target_write_u32(target, target_mem_base, target_mem_base+DATA_OFFS);
                target_write_u32(target, 0x31000100, target_mem_base+DATA_OFFS);
                /* DMACCxDestAddr = SLC_DMA_DATA */
                target_write_u32(target, target_mem_base+4, 0x20020038);
                target_write_u32(target, 0x31000104, 0x20020038);
                /* DMACCxLLI = next element */
                target_write_u32(target,
                    target_mem_base+8,
                    (target_mem_base+32)&0xfffffffc);
                target_write_u32(target, 0x31000108,
                    (target_mem_base+32)&0xfffffffc);
                /* DMACCxControl =  TransferSize =512 or 128, Source burst size =16,
                 * Destination burst size = 16, Source transfer width = 32 bit,
                 * Destination transfer width = 32 bit, Source AHB master select = M0,
                 * Destination AHB master select = M0, Source increment = 1,
                 * Destination increment = 0, Terminal count interrupt enable bit = 0*/
                target_write_u32(target,
                    target_mem_base+12,
                    (nand->page_size ==
                 2048 ? 512 : 128) | 3<<12 | 3<<15 | 2<<18 | 2<<21 | 0<<24 | 0<<25 |
                 1<<26 | 0<<27 | 0<<31);
                target_write_u32(target,
                    0x3100010c,
                    (nand->page_size ==
                 2048 ? 512 : 128) | 3<<12 | 3<<15 | 2<<18 | 2<<21 | 0<<24 | 0<<25 |
                 1<<26 | 0<<27 | 0<<31);
                i = 1;
            } else if (!data && oob)
                i = 0;
 
            /* -------LLI for spare area---------
             * DMACC0SrcAddr = SRAM*/
            target_write_u32(target, target_mem_base+0+i*32, target_mem_base+SPARE_OFFS);
            if (i == 0)
                target_write_u32(target, 0x31000100, target_mem_base+SPARE_OFFS);
            /* DMACCxDestAddr = SLC_DMA_DATA */
            target_write_u32(target, target_mem_base+4+i*32, 0x20020038);
            if (i == 0)
                target_write_u32(target, 0x31000104, 0x20020038);
            /* DMACCxLLI = next element = NULL */
            target_write_u32(target, target_mem_base+8+i*32, 0);
            if (i == 0)
                target_write_u32(target, 0x31000108, 0);
            /* DMACCxControl =  TransferSize =16 for large page or 4 for small page,
             * Source burst size =16, Destination burst size = 16, Source transfer width = 32 bit,
             * Destination transfer width = 32 bit, Source AHB master select = M0,
             * Destination AHB master select = M0, Source increment = 1,
             * Destination increment = 0, Terminal count interrupt enable bit = 0*/
            target_write_u32(target,
                target_mem_base+12+i*32,
                (nand->page_size ==
             2048 ? 0x10 : 0x04) | 3<<12 | 3<<15 | 2<<18 | 2<<21 | 0<<24 | 0<<25 | 1<<26 |
             0<<27 | 0<<31);
            if (i == 0)
                target_write_u32(target, 0x3100010c,
                    (nand->page_size == 2048 ?
                    0x10 : 0x04) | 3<<12 | 3<<15 | 2<<18 | 2<<21 | 0<<24 |
                    0<<25 | 1<<26 | 0<<27 | 0<<31);
 
            memset(ecc_flash_buffer, 0xff, 64);
            if (oob)
                memcpy(ecc_flash_buffer, oob, oob_size);
            target_write_memory(target,
                target_mem_base+SPARE_OFFS,
                4,
                16,
                ecc_flash_buffer);
 
            if (data) {
                memset(page_buffer, 0xff, nand->page_size == 2048 ? 2048 : 512);
                memcpy(page_buffer, data, data_size);
                target_write_memory(target,
                    target_mem_base+DATA_OFFS,
                    4,
                    nand->page_size == 2048 ? 512 : 128,
                    page_buffer);
            }
 
            free(page_buffer);
            free(ecc_flash_buffer);
 
            /* Enable DMA after channel set up !
                LLI only works when DMA is the flow controller!
            */
            /* DMACCxConfig= E=1, SrcPeripheral = 1 (SLC), DestPeripheral = 1 (SLC),
             *FlowCntrl = 2 (Pher -> Mem, DMA), IE = 0, ITC = 0, L= 0, H=0*/
            target_write_u32(target,
                0x31000110,
                1 | 1<<1 | 1<<6 | 2<<11 | 0<<14 | 0<<15 | 0<<16 | 0<<18);
 
            /* SLC_CTRL = 3 (START DMA), ECC_CLEAR */
            target_write_u32(target, 0x20020010, 0x3);
 
            /* SLC_ICR = 2, INT_TC_CLR, clear pending TC*/
            target_write_u32(target, 0x20020028, 2);
 
            /* SLC_TC */
            if (!data && oob)
                target_write_u32(target, 0x20020030,
                    (nand->page_size == 2048 ? 0x10 : 0x04));
            else
                target_write_u32(target, 0x20020030,
                    (nand->page_size == 2048 ? 0x840 : 0x210));
 
            nand_write_finish(nand);
 
            if (!lpc3180_tc_ready(nand, 1000)) {
                LOG_ERROR("timeout while waiting for completion of DMA");
                return ERROR_NAND_OPERATION_FAILED;
            }
 
            target_free_working_area(target, pworking_area);
 
            LOG_INFO("Page =  0x%" PRIx32 " was written.", page);
 
        } else
            return nand_write_page_raw(nand, page, data, data_size, oob, oob_size);
    }
 
    return ERROR_OK;
}
 
static int lpc3180_read_page(struct nand_device *nand,
    uint32_t page,
    uint8_t *data,
    uint32_t data_size,
    uint8_t *oob,
    uint32_t oob_size)
{
    struct lpc3180_nand_controller *lpc3180_info = nand->controller_priv;
    struct target *target = nand->target;
    uint8_t *page_buffer;
 
    if (target->state != TARGET_HALTED) {
        LOG_ERROR("target must be halted to use LPC3180 NAND flash controller");
        return ERROR_NAND_OPERATION_FAILED;
    }
 
    if (lpc3180_info->selected_controller == LPC3180_NO_CONTROLLER) {
        LOG_ERROR("BUG: no LPC3180 NAND flash controller selected");
        return ERROR_NAND_OPERATION_FAILED;
    } else if (lpc3180_info->selected_controller == LPC3180_MLC_CONTROLLER) {
        uint8_t *oob_buffer;
        uint32_t page_bytes_done = 0;
        uint32_t oob_bytes_done = 0;
        uint32_t mlc_isr;
 
#if 0
        if (oob && (oob_size > 6)) {
            LOG_ERROR("LPC3180 MLC controller can't read more than 6 bytes of OOB data");
            return ERROR_NAND_OPERATION_NOT_SUPPORTED;
        }
#endif
 
        if (data_size > (uint32_t)nand->page_size) {
            LOG_ERROR("data size exceeds page size");
            return ERROR_NAND_OPERATION_NOT_SUPPORTED;
        }
 
        if (nand->page_size == 2048) {
            page_buffer = malloc(2048);
            oob_buffer = malloc(64);
        } else {
            page_buffer = malloc(512);
            oob_buffer = malloc(16);
        }
 
        if (!data && oob) {
            /* MLC_CMD = Read OOB
             * we can use the READOOB command on both small and large page devices,
             * as the controller translates the 0x50 command to a 0x0 with appropriate
             * positioning of the serial buffer read pointer
             */
            target_write_u32(target, 0x200b8000, NAND_CMD_READOOB);
        } else {
            /* MLC_CMD = Read0 */
            target_write_u32(target, 0x200b8000, NAND_CMD_READ0);
        }
 
        if (nand->page_size == 512) {
            /* small page device
             * MLC_ADDR = 0x0 (one column cycle) */
            target_write_u32(target, 0x200b8004, 0x0);
 
            /* MLC_ADDR = row */
            target_write_u32(target, 0x200b8004, page & 0xff);
            target_write_u32(target, 0x200b8004, (page >> 8) & 0xff);
 
            if (nand->address_cycles == 4)
                target_write_u32(target, 0x200b8004, (page >> 16) & 0xff);
        } else {
            /* large page device
             * MLC_ADDR = 0x0 (two column cycles) */
            target_write_u32(target, 0x200b8004, 0x0);
            target_write_u32(target, 0x200b8004, 0x0);
 
            /* MLC_ADDR = row */
            target_write_u32(target, 0x200b8004, page & 0xff);
            target_write_u32(target, 0x200b8004, (page >> 8) & 0xff);
 
            /* MLC_CMD = Read Start */
            target_write_u32(target, 0x200b8000, NAND_CMD_READSTART);
        }
 
        while (page_bytes_done < (uint32_t)nand->page_size) {
            /* MLC_ECC_AUTO_DEC_REG = dummy */
            target_write_u32(target, 0x200b8014, 0xaa55aa55);
 
            if (!lpc3180_controller_ready(nand, 1000)) {
                LOG_ERROR("timeout while waiting for completion of auto decode cycle");
                free(page_buffer);
                free(oob_buffer);
                return ERROR_NAND_OPERATION_FAILED;
            }
 
            target_read_u32(target, 0x200b8048, &mlc_isr);
 
            if (mlc_isr & 0x8) {
                if (mlc_isr & 0x40) {
                    LOG_ERROR("uncorrectable error detected: 0x%2.2x",
                        (unsigned)mlc_isr);
                    free(page_buffer);
                    free(oob_buffer);
                    return ERROR_NAND_OPERATION_FAILED;
                }
 
                LOG_WARNING("%i symbol error detected and corrected",
                    ((int)(((mlc_isr & 0x30) >> 4) + 1)));
            }
 
            if (data)
                target_read_memory(target,
                    0x200a8000,
                    4,
                    128,
                    page_buffer + page_bytes_done);
 
            if (oob)
                target_read_memory(target,
                    0x200a8000,
                    4,
                    4,
                    oob_buffer + oob_bytes_done);
 
            page_bytes_done += 512;
            oob_bytes_done += 16;
        }
 
        if (data)
            memcpy(data, page_buffer, data_size);
 
        if (oob)
            memcpy(oob, oob_buffer, oob_size);
 
        free(page_buffer);
        free(oob_buffer);
    } else if (lpc3180_info->selected_controller == LPC3180_SLC_CONTROLLER) {
 
        /**********************************************************************
        *     Read both SLC NAND flash page main area and spare area.
        *     Small page -
        *      ------------------------------------------
        *     |    512 bytes main   |   16 bytes spare   |
        *      ------------------------------------------
        *     Large page -
        *      ------------------------------------------
        *     |   2048 bytes main   |   64 bytes spare   |
        *      ------------------------------------------
        *     If DMA & ECC enabled, then the ECC generated for the 1st 256-byte
        *     data is compared with the 3rd word of the spare area. The ECC
        *     generated for the 2nd 256-byte data is compared with the 4th word
        *     of the spare area. The ECC generated for the 3rd 256-byte data is
        *     compared with the 7th word of the spare area. The ECC generated
        *     for the 4th 256-byte data is compared with the 8th word of the
        *     spare area and so on.
        *
        **********************************************************************/
 
        int retval, i, target_mem_base;
        uint8_t *ecc_hw_buffer;
        uint8_t *ecc_flash_buffer;
        struct working_area *pworking_area;
 
        if (lpc3180_info->is_bulk) {
 
            /* read always the data and also oob areas*/
 
            retval = nand_page_command(nand, page, NAND_CMD_READ0, 0);
            if (retval != ERROR_OK)
                return retval;
 
            /* allocate a working area */
            if (target->working_area_size < (uint32_t) nand->page_size + 0x200) {
                LOG_ERROR("Reserve at least 0x%x physical target working area",
                    nand->page_size + 0x200);
                return ERROR_FLASH_OPERATION_FAILED;
            }
            if (target->working_area_phys%4) {
                LOG_ERROR(
                    "Reserve the physical target working area at word boundary");
                return ERROR_FLASH_OPERATION_FAILED;
            }
            if (target_alloc_working_area(target, target->working_area_size,
                    &pworking_area) != ERROR_OK) {
                LOG_ERROR("no working area specified, can't read LPC internal flash");
                return ERROR_FLASH_OPERATION_FAILED;
            }
            target_mem_base = target->working_area_phys;
 
            if (nand->page_size == 2048)
                page_buffer = malloc(2048);
            else
                page_buffer = malloc(512);
 
            ecc_hw_buffer = malloc(32);
            ecc_flash_buffer = malloc(64);
 
            /* SLC_CFG = 0x (Force nCE assert, DMA ECC enabled, ECC enabled, DMA burst
             *enabled, DMA read from SLC, WIDTH = bus_width) */
            target_write_u32(target, 0x20020014, 0x3e);
 
            /* set DMA LLI-s in target memory and in DMA*/
            for (i = 0; i < nand->page_size/0x100; i++) {
                int tmp;
                /* -------LLI for 256 byte block---------
                 * DMACC0SrcAddr = SLC_DMA_DATA*/
                target_write_u32(target, target_mem_base+0+i*32, 0x20020038);
                if (i == 0)
                    target_write_u32(target, 0x31000100, 0x20020038);
                /* DMACCxDestAddr = SRAM */
                target_write_u32(target,
                    target_mem_base+4+i*32,
                    target_mem_base+DATA_OFFS+i*256);
                if (i == 0)
                    target_write_u32(target,
                        0x31000104,
                        target_mem_base+DATA_OFFS);
                /* DMACCxLLI = next element */
                tmp = (target_mem_base+(1+i*2)*16)&0xfffffffc;
                target_write_u32(target, target_mem_base+8+i*32, tmp);
                if (i == 0)
                    target_write_u32(target, 0x31000108, tmp);
                /* DMACCxControl =  TransferSize =64, Source burst size =16,
                 * Destination burst size = 16, Source transfer width = 32 bit,
                 * Destination transfer width = 32 bit, Source AHB master select = M0,
                 * Destination AHB master select = M0, Source increment = 0,
                 * Destination increment = 1, Terminal count interrupt enable bit = 0*/
                target_write_u32(target,
                    target_mem_base+12+i*32,
                    0x40 | 3<<12 | 3<<15 | 2<<18 | 2<<21 | 0<<24 | 0<<25 | 0<<26 | 1<<27 | 0<<
                    31);
                if (i == 0)
                    target_write_u32(target,
                        0x3100010c,
                        0x40 | 3<<12 | 3<<15 | 2<<18 | 2<<21 | 0<<24 | 0<<25 | 0<<26 | 1<<27 | 0<<
                        31);
 
                /* -------LLI for 3 byte ECC---------
                 * DMACC0SrcAddr = SLC_ECC*/
                target_write_u32(target, target_mem_base+16+i*32, 0x20020034);
                /* DMACCxDestAddr = SRAM */
                target_write_u32(target,
                    target_mem_base+20+i*32,
                    target_mem_base+ECC_OFFS+i*4);
                /* DMACCxLLI = next element */
                tmp = (target_mem_base+(2+i*2)*16)&0xfffffffc;
                target_write_u32(target, target_mem_base+24+i*32, tmp);
                /* DMACCxControl =  TransferSize =1, Source burst size =4,
                 * Destination burst size = 4, Source transfer width = 32 bit,
                 * Destination transfer width = 32 bit, Source AHB master select = M0,
                 * Destination AHB master select = M0, Source increment = 0,
                 * Destination increment = 1, Terminal count interrupt enable bit = 0*/
                target_write_u32(target,
                    target_mem_base+28+i*32,
                    0x01 | 1<<12 | 1<<15 | 2<<18 | 2<<21 | 0<<24 | 0<<25 | 0<<26 | 1<<27 | 0<<
                    31);
            }
 
            /* -------LLI for spare area---------
             * DMACC0SrcAddr = SLC_DMA_DATA*/
            target_write_u32(target, target_mem_base+0+i*32, 0x20020038);
            /* DMACCxDestAddr = SRAM */
            target_write_u32(target, target_mem_base+4+i*32, target_mem_base+SPARE_OFFS);
            /* DMACCxLLI = next element = NULL */
            target_write_u32(target, target_mem_base+8+i*32, 0);
            /* DMACCxControl =  TransferSize =16 for large page or 4 for small page,
             * Source burst size =16, Destination burst size = 16, Source transfer width = 32 bit,
             * Destination transfer width = 32 bit, Source AHB master select = M0,
             * Destination AHB master select = M0, Source increment = 0,
             * Destination increment = 1, Terminal count interrupt enable bit = 0*/
            target_write_u32(target,
                target_mem_base + 12 + i * 32,
                (nand->page_size == 2048 ? 0x10 : 0x04) | 3<<12 | 3<<15 | 2<<18 | 2<<21 |
             0<<24 | 0<<25 | 0<<26 | 1<<27 | 0<<31);
 
            /* Enable DMA after channel set up !
                LLI only works when DMA is the flow controller!
            */
            /* DMACCxConfig= E=1, SrcPeripheral = 1 (SLC), DestPeripheral = 1 (SLC),
             *FlowCntrl = 2 (Pher-> Mem, DMA), IE = 0, ITC = 0, L= 0, H=0*/
            target_write_u32(target,
                0x31000110,
                1 | 1<<1 | 1<<6 |  2<<11 | 0<<14 | 0<<15 | 0<<16 | 0<<18);
 
            /* SLC_CTRL = 3 (START DMA), ECC_CLEAR */
            target_write_u32(target, 0x20020010, 0x3);
 
            /* SLC_ICR = 2, INT_TC_CLR, clear pending TC*/
            target_write_u32(target, 0x20020028, 2);
 
            /* SLC_TC */
            target_write_u32(target, 0x20020030,
                (nand->page_size == 2048 ? 0x840 : 0x210));
 
            if (!lpc3180_tc_ready(nand, 1000)) {
                LOG_ERROR("timeout while waiting for completion of DMA");
                free(page_buffer);
                free(ecc_hw_buffer);
                free(ecc_flash_buffer);
                target_free_working_area(target, pworking_area);
                return ERROR_NAND_OPERATION_FAILED;
            }
 
            if (data) {
                target_read_memory(target,
                    target_mem_base+DATA_OFFS,
                    4,
                    nand->page_size == 2048 ? 512 : 128,
                    page_buffer);
                memcpy(data, page_buffer, data_size);
 
                LOG_INFO("Page =  0x%" PRIx32 " was read.", page);
 
                /* check hw generated ECC for each 256 bytes block with the saved
                 *ECC in flash spare area*/
                int idx = nand->page_size/0x200;
                target_read_memory(target,
                    target_mem_base+SPARE_OFFS,
                    4,
                    16,
                    ecc_flash_buffer);
                target_read_memory(target,
                    target_mem_base+ECC_OFFS,
                    4,
                    8,
                    ecc_hw_buffer);
                for (i = 0; i < idx; i++) {
                    if ((0x00ffffff & *(uint32_t *)(void *)(ecc_hw_buffer+i*8)) !=
                            (0x00ffffff & *(uint32_t *)(void *)(ecc_flash_buffer+8+i*16)))
                        LOG_WARNING(
                            "ECC mismatch at 256 bytes size block= %d at page= 0x%" PRIx32,
                            i * 2 + 1, page);
                    if ((0x00ffffff & *(uint32_t *)(void *)(ecc_hw_buffer+4+i*8)) !=
                            (0x00ffffff & *(uint32_t *)(void *)(ecc_flash_buffer+12+i*16)))
                        LOG_WARNING(
                            "ECC mismatch at 256 bytes size block= %d at page= 0x%" PRIx32,
                            i * 2 + 2, page);
                }
            }
 
            if (oob)
                memcpy(oob, ecc_flash_buffer, oob_size);
 
            free(page_buffer);
            free(ecc_hw_buffer);
            free(ecc_flash_buffer);
 
            target_free_working_area(target, pworking_area);
 
        } else
            return nand_read_page_raw(nand, page, data, data_size, oob, oob_size);
    }
 
    return ERROR_OK;
}
 
static int lpc3180_controller_ready(struct nand_device *nand, int timeout)
{
    struct lpc3180_nand_controller *lpc3180_info = nand->controller_priv;
    struct target *target = nand->target;
 
    if (target->state != TARGET_HALTED) {
        LOG_ERROR("target must be halted to use LPC3180 NAND flash controller");
        return ERROR_NAND_OPERATION_FAILED;
    }
 
    LOG_DEBUG("lpc3180_controller_ready count start=%d", timeout);
 
    do {
        if (lpc3180_info->selected_controller == LPC3180_MLC_CONTROLLER) {
            uint8_t status;
 
            /* Read MLC_ISR, wait for controller to become ready */
            target_read_u8(target, 0x200b8048, &status);
 
            if (status & 2) {
                LOG_DEBUG("lpc3180_controller_ready count=%d",
                    timeout);
                return 1;
            }
        } else if (lpc3180_info->selected_controller == LPC3180_SLC_CONTROLLER) {
            uint32_t status;
 
            /* Read SLC_STAT and check READY bit */
            target_read_u32(target, 0x20020018, &status);
 
            if (status & 1) {
                LOG_DEBUG("lpc3180_controller_ready count=%d",
                    timeout);
                return 1;
            }
        }
 
        alive_sleep(1);
    } while (timeout-- > 0);
 
    return 0;
}
 
static int lpc3180_nand_ready(struct nand_device *nand, int timeout)
{
    struct lpc3180_nand_controller *lpc3180_info = nand->controller_priv;
    struct target *target = nand->target;
 
    if (target->state != TARGET_HALTED) {
        LOG_ERROR("target must be halted to use LPC3180 NAND flash controller");
        return ERROR_NAND_OPERATION_FAILED;
    }
 
    LOG_DEBUG("lpc3180_nand_ready count start=%d", timeout);
 
    do {
        if (lpc3180_info->selected_controller == LPC3180_MLC_CONTROLLER) {
            uint8_t status = 0x0;
 
            /* Read MLC_ISR, wait for NAND flash device to become ready */
            target_read_u8(target, 0x200b8048, &status);
 
            if (status & 1) {
                LOG_DEBUG("lpc3180_nand_ready count end=%d",
                    timeout);
                return 1;
            }
        } else if (lpc3180_info->selected_controller == LPC3180_SLC_CONTROLLER) {
            uint32_t status = 0x0;
 
            /* Read SLC_STAT and check READY bit */
            target_read_u32(target, 0x20020018, &status);
 
            if (status & 1) {
                LOG_DEBUG("lpc3180_nand_ready count end=%d",
                    timeout);
                return 1;
            }
        }
 
        alive_sleep(1);
    } while (timeout-- > 0);
 
    return 0;
}
 
static int lpc3180_tc_ready(struct nand_device *nand, int timeout)
{
    struct lpc3180_nand_controller *lpc3180_info = nand->controller_priv;
    struct target *target = nand->target;
 
    if (target->state != TARGET_HALTED) {
        LOG_ERROR("target must be halted to use LPC3180 NAND flash controller");
        return ERROR_NAND_OPERATION_FAILED;
    }
 
    LOG_DEBUG("lpc3180_tc_ready count start=%d",
        timeout);
 
    do {
        if (lpc3180_info->selected_controller == LPC3180_SLC_CONTROLLER) {
            uint32_t status = 0x0;
            /* Read SLC_INT_STAT and check INT_TC_STAT bit */
            target_read_u32(target, 0x2002001c, &status);
 
            if (status & 2) {
                LOG_DEBUG("lpc3180_tc_ready count=%d",
                    timeout);
                return 1;
            }
        }
 
        alive_sleep(1);
    } while (timeout-- > 0);
 
    return 0;
}
 
COMMAND_HANDLER(handle_lpc3180_select_command)
{
    struct lpc3180_nand_controller *lpc3180_info = NULL;
    char *selected[] = {
        "no", "mlc", "slc"
    };
 
    if ((CMD_ARGC < 1) || (CMD_ARGC > 3))
        return ERROR_COMMAND_SYNTAX_ERROR;
 
    unsigned num;
    COMMAND_PARSE_NUMBER(uint, CMD_ARGV[0], num);
    struct nand_device *nand = get_nand_device_by_num(num);
    if (!nand) {
        command_print(CMD, "nand device '#%s' is out of bounds", CMD_ARGV[0]);
        return ERROR_OK;
    }
 
    lpc3180_info = nand->controller_priv;
 
    if (CMD_ARGC >= 2) {
        if (strcmp(CMD_ARGV[1], "mlc") == 0)
            lpc3180_info->selected_controller = LPC3180_MLC_CONTROLLER;
        else if (strcmp(CMD_ARGV[1], "slc") == 0) {
            lpc3180_info->selected_controller = LPC3180_SLC_CONTROLLER;
            if (CMD_ARGC == 3 && strcmp(CMD_ARGV[2], "bulk") == 0)
                lpc3180_info->is_bulk = 1;
            else
                lpc3180_info->is_bulk = 0;
        } else
            return ERROR_COMMAND_SYNTAX_ERROR;
    }
 
    if (lpc3180_info->selected_controller == LPC3180_MLC_CONTROLLER)
        command_print(CMD, "%s controller selected",
            selected[lpc3180_info->selected_controller]);
    else
        command_print(CMD,
            lpc3180_info->is_bulk ? "%s controller selected bulk mode is available" :
            "%s controller selected bulk mode is not available",
            selected[lpc3180_info->selected_controller]);
 
    return ERROR_OK;
}
 
static const struct command_registration lpc3180_exec_command_handlers[] = {
    {
        .name = "select",
        .handler = handle_lpc3180_select_command,
        .mode = COMMAND_EXEC,
        .help =
            "select MLC or SLC controller (default is MLC), SLC can be set to bulk mode",
        .usage = "bank_id ['mlc'|'slc' ['bulk'] ]",
    },
    COMMAND_REGISTRATION_DONE
};
static const struct command_registration lpc3180_command_handler[] = {
    {
        .name = "lpc3180",
        .mode = COMMAND_ANY,
        .help = "LPC3180 NAND flash controller commands",
        .usage = "",
        .chain = lpc3180_exec_command_handlers,
    },
    COMMAND_REGISTRATION_DONE
};
 
struct nand_flash_controller lpc3180_nand_controller = {
    .name = "lpc3180",
    .commands = lpc3180_command_handler,
    .nand_device_command = lpc3180_nand_device_command,
    .init = lpc3180_init,
    .reset = lpc3180_reset,
    .command = lpc3180_command,
    .address = lpc3180_address,
    .write_data = lpc3180_write_data,
    .read_data = lpc3180_read_data,
    .write_page = lpc3180_write_page,
    .read_page = lpc3180_read_page,
    .nand_ready = lpc3180_nand_ready,
};