lpc32xx.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) 2011 Bjarne Steinsbo <bsteinsbo@gmail.com>              *
 *   Copyright (C) 2010 richard vegh <vegh.ricsi@gmail.com>                *
 *   Copyright (C) 2010 Oyvind Harboe <oyvind.harboe@zylin.com>            *
 *                                                                         *
 *   Based on a combination of the lpc3180 driver and code from            *
 *   uboot-2009.03-lpc32xx by Kevin Wells.                                 *
 *   Any bugs are mine. --BSt                                              *
 ***************************************************************************/
 
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
 
#include "imp.h"
#include "lpc32xx.h"
#include <target/target.h>
 
static int lpc32xx_reset(struct nand_device *nand);
static int lpc32xx_controller_ready(struct nand_device *nand, int timeout);
static int lpc32xx_tc_ready(struct nand_device *nand, int timeout);
 
/* These are offset with the working area in IRAM when using DMA to
 * read/write data to the SLC controller.
 * - DMA descriptors will be put at start of working area,
 * - Hardware generated ECC will be stored at ECC_OFFS
 * - OOB will be read/written from/to SPARE_OFFS
 * - Actual page data will be read from/to DATA_OFFS
 * There are unused holes between the used areas.
 */
#define ECC_OFFS   0x120
#define SPARE_OFFS 0x140
#define DATA_OFFS  0x200
 
static const int sp_ooblayout[] = {
    10, 11, 12, 13, 14, 15
};
static const int lp_ooblayout[] = {
    40, 41, 42, 43, 44, 45,
    46, 47, 48, 49, 50, 51,
    52, 53, 54, 55, 56, 57,
    58, 59, 60, 61, 62, 63
};
 
struct dmac_ll {
    volatile uint32_t dma_src;
    volatile uint32_t dma_dest;
    volatile uint32_t next_lli;
    volatile uint32_t next_ctrl;
};
 
static struct dmac_ll dmalist[(2048/256) * 2 + 1];
 
/* nand device lpc32xx <target#> <oscillator_frequency>
 */
NAND_DEVICE_COMMAND_HANDLER(lpc32xx_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 lpc32xx_nand_controller *lpc32xx_info;
    lpc32xx_info = malloc(sizeof(struct lpc32xx_nand_controller));
    nand->controller_priv = lpc32xx_info;
 
    lpc32xx_info->osc_freq = osc_freq;
 
    if ((lpc32xx_info->osc_freq < 1000) || (lpc32xx_info->osc_freq > 20000))
        LOG_WARNING("LPC32xx oscillator frequency should be between "
            "1000 and 20000 kHz, was %i",
            lpc32xx_info->osc_freq);
 
    lpc32xx_info->selected_controller = LPC32XX_NO_CONTROLLER;
    lpc32xx_info->sw_write_protection = 0;
    lpc32xx_info->sw_wp_lower_bound = 0x0;
    lpc32xx_info->sw_wp_upper_bound = 0x0;
 
    return ERROR_OK;
}
 
static int lpc32xx_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 lpc32xx_cycle_time(struct nand_device *nand)
{
    struct lpc32xx_nand_controller *lpc32xx_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;
    int retval;
 
    /* calculate timings */
 
    /* determine current SYSCLK (13'MHz or main oscillator) */
    retval = target_read_u32(target, 0x40004050, &sysclk_ctrl);
    if (retval != ERROR_OK) {
        LOG_ERROR("could not read SYSCLK_CTRL");
        return ERROR_NAND_OPERATION_FAILED;
    }
 
    if ((sysclk_ctrl & 1) == 0)
        sysclk = lpc32xx_info->osc_freq;
    else
        sysclk = 13000;
 
    /* determine selected HCLK source */
    retval = target_read_u32(target, 0x40004044, &pwr_ctrl);
    if (retval != ERROR_OK) {
        LOG_ERROR("could not read HCLK_CTRL");
        return ERROR_NAND_OPERATION_FAILED;
    }
 
    if ((pwr_ctrl & (1 << 2)) == 0)     /* DIRECT RUN mode */
        hclk = sysclk;
    else {
        retval = target_read_u32(target, 0x40004058, &hclkpll_ctrl);
        if (retval != ERROR_OK) {
            LOG_ERROR("could not read HCLKPLL_CTRL");
            return ERROR_NAND_OPERATION_FAILED;
        }
        hclk_pll = lpc32xx_pll(sysclk, hclkpll_ctrl);
 
        retval = target_read_u32(target, 0x40004040, &hclkdiv_ctrl);
        if (retval != ERROR_OK) {
            LOG_ERROR("could not read CLKDIV_CTRL");
            return ERROR_NAND_OPERATION_FAILED;
        }
 
        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("LPC32xx HCLK currently clocked at %i kHz", hclk);
 
    return (1.0 / hclk) * 1000000.0;
}
 
static int lpc32xx_init(struct nand_device *nand)
{
    struct lpc32xx_nand_controller *lpc32xx_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;
    int retval;
 
    if (target->state != TARGET_HALTED) {
        LOG_ERROR("target must be halted to use LPC32xx "
            "NAND flash controller");
        return ERROR_NAND_OPERATION_FAILED;
    }
 
    /* sanitize arguments */
    if (bus_width != 8) {
        LOG_ERROR("LPC32xx doesn't support %i", bus_width);
        return ERROR_NAND_OPERATION_NOT_SUPPORTED;
    }
 
    /* inform calling code about selected bus width */
    nand->bus_width = bus_width;
 
    if ((address_cycles < 3) || (address_cycles > 5)) {
        LOG_ERROR("LPC32xx driver doesn't support %i address cycles", address_cycles);
        return ERROR_NAND_OPERATION_NOT_SUPPORTED;
    }
 
    if ((page_size != 512) && (page_size != 2048)) {
        LOG_ERROR("LPC32xx doesn't support page size %i", page_size);
        return ERROR_NAND_OPERATION_NOT_SUPPORTED;
    }
 
    /* select MLC controller if none is currently selected */
    if (lpc32xx_info->selected_controller == LPC32XX_NO_CONTROLLER) {
        LOG_DEBUG("no LPC32xx NAND flash controller selected, "
            "using default 'slc'");
        lpc32xx_info->selected_controller = LPC32XX_SLC_CONTROLLER;
    }
 
    if (lpc32xx_info->selected_controller == LPC32XX_MLC_CONTROLLER) {
        uint32_t mlc_icr_value = 0x0;
        float cycle;
        int twp, twh, trp, treh, trhz, trbwb, tcea;
 
        /* FLASHCLK_CTRL = 0x22 (enable clk for MLC) */
        retval = target_write_u32(target, 0x400040c8, 0x22);
        if (retval != ERROR_OK) {
            LOG_ERROR("could not set FLASHCLK_CTRL");
            return ERROR_NAND_OPERATION_FAILED;
        }
 
        /* MLC_CEH = 0x0 (Force nCE assert) */
        retval = target_write_u32(target, 0x200b804c, 0x0);
        if (retval != ERROR_OK) {
            LOG_ERROR("could not set MLC_CEH");
            return ERROR_NAND_OPERATION_FAILED;
        }
 
        /* MLC_LOCK = 0xa25e (unlock protected registers) */
        retval = target_write_u32(target, 0x200b8044, 0xa25e);
        if (retval != ERROR_OK) {
            LOG_ERROR("could not set MLC_LOCK");
            return ERROR_NAND_OPERATION_FAILED;
        }
 
        /* MLC_ICR = configuration */
        if (lpc32xx_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;
        retval = target_write_u32(target, 0x200b8030, mlc_icr_value);
        if (retval != ERROR_OK) {
            LOG_ERROR("could not set MLC_ICR");
            return ERROR_NAND_OPERATION_FAILED;
        }
 
        /* calculate NAND controller timings */
        cycle = lpc32xx_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) */
        retval = target_write_u32(target, 0x200b8044, 0xa25e);
        if (retval != ERROR_OK) {
            LOG_ERROR("could not set MLC_LOCK");
            return ERROR_NAND_OPERATION_FAILED;
        }
 
        /* MLC_TIME_REG */
        retval = 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));
        if (retval != ERROR_OK) {
            LOG_ERROR("could not set MLC_TIME_REG");
            return ERROR_NAND_OPERATION_FAILED;
        }
 
        retval = lpc32xx_reset(nand);
        if (retval != ERROR_OK)
            return ERROR_NAND_OPERATION_FAILED;
    } else if (lpc32xx_info->selected_controller == LPC32XX_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 clk for SLC) */
        retval = target_write_u32(target, 0x400040c8, 0x05);
        if (retval != ERROR_OK) {
            LOG_ERROR("could not set FLASHCLK_CTRL");
            return ERROR_NAND_OPERATION_FAILED;
        }
 
        /* after reset set other registers of SLC,
         * so reset calling is here at the beginning
         */
        retval = lpc32xx_reset(nand);
        if (retval != ERROR_OK)
            return ERROR_NAND_OPERATION_FAILED;
 
        /* SLC_CFG =
            Force nCE assert,
            DMA ECC enabled,
            ECC enabled,
            DMA burst enabled,
            DMA read from SLC,
            WIDTH = bus_width)
        */
        retval = target_write_u32(target, 0x20020014,
                0x3e | ((bus_width == 16) ? 1 : 0));
        if (retval != ERROR_OK) {
            LOG_ERROR("could not set SLC_CFG");
            return ERROR_NAND_OPERATION_FAILED;
        }
 
        /* SLC_IEN = 3 (INT_RDY_EN = 1) ,(INT_TC_STAT = 1) */
        retval = target_write_u32(target, 0x20020020, 0x03);
        if (retval != ERROR_OK) {
            LOG_ERROR("could not set SLC_IEN");
            return ERROR_NAND_OPERATION_FAILED;
        }
 
        /* DMA configuration */
 
        /* DMACLK_CTRL = 0x01 (enable clock for DMA controller) */
        retval = target_write_u32(target, 0x400040e8, 0x01);
        if (retval != ERROR_OK) {
            LOG_ERROR("could not set DMACLK_CTRL");
            return ERROR_NAND_OPERATION_FAILED;
        }
 
        /* DMACConfig = DMA enabled*/
        retval = target_write_u32(target, 0x31000030, 0x01);
        if (retval != ERROR_OK) {
            LOG_ERROR("could not set DMACConfig");
            return ERROR_NAND_OPERATION_FAILED;
        }
 
        /* calculate NAND controller timings */
        cycle = lpc32xx_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 */
        retval = 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));
        if (retval != ERROR_OK) {
            LOG_ERROR("could not set SLC_TAC");
            return ERROR_NAND_OPERATION_FAILED;
        }
    }
 
    return ERROR_OK;
}
 
static int lpc32xx_reset(struct nand_device *nand)
{
    struct lpc32xx_nand_controller *lpc32xx_info = nand->controller_priv;
    struct target *target = nand->target;
    int retval;
 
    if (target->state != TARGET_HALTED) {
        LOG_ERROR("target must be halted to use "
            "LPC32xx NAND flash controller");
        return ERROR_NAND_OPERATION_FAILED;
    }
 
    if (lpc32xx_info->selected_controller == LPC32XX_NO_CONTROLLER) {
        LOG_ERROR("BUG: no LPC32xx NAND flash controller selected");
        return ERROR_NAND_OPERATION_FAILED;
    } else if (lpc32xx_info->selected_controller == LPC32XX_MLC_CONTROLLER) {
        /* MLC_CMD = 0xff (reset controller and NAND device) */
        retval = target_write_u32(target, 0x200b8000, 0xff);
        if (retval != ERROR_OK) {
            LOG_ERROR("could not set MLC_CMD");
            return ERROR_NAND_OPERATION_FAILED;
        }
 
        if (!lpc32xx_controller_ready(nand, 100)) {
            LOG_ERROR("LPC32xx MLC NAND controller timed out "
                "after reset");
            return ERROR_NAND_OPERATION_TIMEOUT;
        }
    } else if (lpc32xx_info->selected_controller == LPC32XX_SLC_CONTROLLER) {
        /* SLC_CTRL = 0x6 (ECC_CLEAR, SW_RESET) */
        retval = target_write_u32(target, 0x20020010, 0x6);
        if (retval != ERROR_OK) {
            LOG_ERROR("could not set SLC_CTRL");
            return ERROR_NAND_OPERATION_FAILED;
        }
 
        if (!lpc32xx_controller_ready(nand, 100)) {
            LOG_ERROR("LPC32xx SLC NAND controller timed out "
                "after reset");
            return ERROR_NAND_OPERATION_TIMEOUT;
        }
    }
 
    return ERROR_OK;
}
 
static int lpc32xx_command(struct nand_device *nand, uint8_t command)
{
    struct lpc32xx_nand_controller *lpc32xx_info = nand->controller_priv;
    struct target *target = nand->target;
    int retval;
 
    if (target->state != TARGET_HALTED) {
        LOG_ERROR("target must be halted to use "
            "LPC32xx NAND flash controller");
        return ERROR_NAND_OPERATION_FAILED;
    }
 
    if (lpc32xx_info->selected_controller == LPC32XX_NO_CONTROLLER) {
        LOG_ERROR("BUG: no LPC32xx NAND flash controller selected");
        return ERROR_NAND_OPERATION_FAILED;
    } else if (lpc32xx_info->selected_controller == LPC32XX_MLC_CONTROLLER) {
        /* MLC_CMD = command */
        retval = target_write_u32(target, 0x200b8000, command);
        if (retval != ERROR_OK) {
            LOG_ERROR("could not set MLC_CMD");
            return ERROR_NAND_OPERATION_FAILED;
        }
    } else if (lpc32xx_info->selected_controller == LPC32XX_SLC_CONTROLLER) {
        /* SLC_CMD = command */
        retval = target_write_u32(target, 0x20020008, command);
        if (retval != ERROR_OK) {
            LOG_ERROR("could not set SLC_CMD");
            return ERROR_NAND_OPERATION_FAILED;
        }
    }
 
    return ERROR_OK;
}
 
static int lpc32xx_address(struct nand_device *nand, uint8_t address)
{
    struct lpc32xx_nand_controller *lpc32xx_info = nand->controller_priv;
    struct target *target = nand->target;
    int retval;
 
    if (target->state != TARGET_HALTED) {
        LOG_ERROR("target must be halted to use "
            "LPC32xx NAND flash controller");
        return ERROR_NAND_OPERATION_FAILED;
    }
 
    if (lpc32xx_info->selected_controller == LPC32XX_NO_CONTROLLER) {
        LOG_ERROR("BUG: no LPC32xx NAND flash controller selected");
        return ERROR_NAND_OPERATION_FAILED;
    } else if (lpc32xx_info->selected_controller == LPC32XX_MLC_CONTROLLER) {
        /* MLC_ADDR = address */
        retval = target_write_u32(target, 0x200b8004, address);
        if (retval != ERROR_OK) {
            LOG_ERROR("could not set MLC_ADDR");
            return ERROR_NAND_OPERATION_FAILED;
        }
    } else if (lpc32xx_info->selected_controller == LPC32XX_SLC_CONTROLLER) {
        /* SLC_ADDR = address */
        retval = target_write_u32(target, 0x20020004, address);
        if (retval != ERROR_OK) {
            LOG_ERROR("could not set SLC_ADDR");
            return ERROR_NAND_OPERATION_FAILED;
        }
    }
 
    return ERROR_OK;
}
 
static int lpc32xx_write_data(struct nand_device *nand, uint16_t data)
{
    struct lpc32xx_nand_controller *lpc32xx_info = nand->controller_priv;
    struct target *target = nand->target;
    int retval;
 
    if (target->state != TARGET_HALTED) {
        LOG_ERROR("target must be halted to use "
            "LPC32xx NAND flash controller");
        return ERROR_NAND_OPERATION_FAILED;
    }
 
    if (lpc32xx_info->selected_controller == LPC32XX_NO_CONTROLLER) {
        LOG_ERROR("BUG: no LPC32xx NAND flash controller selected");
        return ERROR_NAND_OPERATION_FAILED;
    } else if (lpc32xx_info->selected_controller == LPC32XX_MLC_CONTROLLER) {
        /* MLC_DATA = data */
        retval = target_write_u32(target, 0x200b0000, data);
        if (retval != ERROR_OK) {
            LOG_ERROR("could not set MLC_DATA");
            return ERROR_NAND_OPERATION_FAILED;
        }
    } else if (lpc32xx_info->selected_controller == LPC32XX_SLC_CONTROLLER) {
        /* SLC_DATA = data */
        retval = target_write_u32(target, 0x20020000, data);
        if (retval != ERROR_OK) {
            LOG_ERROR("could not set SLC_DATA");
            return ERROR_NAND_OPERATION_FAILED;
        }
    }
 
    return ERROR_OK;
}
 
static int lpc32xx_read_data(struct nand_device *nand, void *data)
{
    struct lpc32xx_nand_controller *lpc32xx_info = nand->controller_priv;
    struct target *target = nand->target;
    int retval;
 
    if (target->state != TARGET_HALTED) {
        LOG_ERROR("target must be halted to use LPC32xx "
            "NAND flash controller");
        return ERROR_NAND_OPERATION_FAILED;
    }
 
    if (lpc32xx_info->selected_controller == LPC32XX_NO_CONTROLLER) {
        LOG_ERROR("BUG: no LPC32xx NAND flash controller selected");
        return ERROR_NAND_OPERATION_FAILED;
    } else if (lpc32xx_info->selected_controller == LPC32XX_MLC_CONTROLLER) {
        /* data = MLC_DATA, use sized access */
        if (nand->bus_width == 8) {
            uint8_t *data8 = data;
            retval = target_read_u8(target, 0x200b0000, data8);
        } else {
            LOG_ERROR("BUG: bus_width neither 8 nor 16 bit");
            return ERROR_NAND_OPERATION_FAILED;
        }
        if (retval != ERROR_OK) {
            LOG_ERROR("could not read MLC_DATA");
            return ERROR_NAND_OPERATION_FAILED;
        }
    } else if (lpc32xx_info->selected_controller == LPC32XX_SLC_CONTROLLER) {
        uint32_t data32;
 
        /* data = SLC_DATA, must use 32-bit access */
        retval = target_read_u32(target, 0x20020000, &data32);
        if (retval != ERROR_OK) {
            LOG_ERROR("could not read SLC_DATA");
            return ERROR_NAND_OPERATION_FAILED;
        }
 
        if (nand->bus_width == 8) {
            uint8_t *data8 = data;
            *data8 = data32 & 0xff;
        } else {
            LOG_ERROR("BUG: bus_width neither 8 nor 16 bit");
            return ERROR_NAND_OPERATION_FAILED;
        }
    }
 
    return ERROR_OK;
}
 
static int lpc32xx_write_page_mlc(struct nand_device *nand, uint32_t page,
    uint8_t *data, uint32_t data_size,
    uint8_t *oob, uint32_t oob_size)
{
    struct target *target = nand->target;
    int retval;
    uint8_t status;
    static uint8_t page_buffer[512];
    static uint8_t oob_buffer[6];
    int quarter, num_quarters;
 
    /* MLC_CMD = sequential input */
    retval = target_write_u32(target, 0x200b8000, NAND_CMD_SEQIN);
    if (retval != ERROR_OK) {
        LOG_ERROR("could not set MLC_CMD");
        return ERROR_NAND_OPERATION_FAILED;
    }
 
    if (nand->page_size == 512) {
        /* MLC_ADDR = 0x0 (one column cycle) */
        retval = target_write_u32(target, 0x200b8004, 0x0);
        if (retval != ERROR_OK) {
            LOG_ERROR("could not set MLC_ADDR");
            return ERROR_NAND_OPERATION_FAILED;
        }
 
        /* MLC_ADDR = row */
        retval = target_write_u32(target, 0x200b8004, page & 0xff);
        if (retval != ERROR_OK) {
            LOG_ERROR("could not set MLC_ADDR");
            return ERROR_NAND_OPERATION_FAILED;
        }
        retval = target_write_u32(target, 0x200b8004,
                (page >> 8) & 0xff);
        if (retval != ERROR_OK) {
            LOG_ERROR("could not set MLC_ADDR");
            return ERROR_NAND_OPERATION_FAILED;
        }
 
        if (nand->address_cycles == 4) {
            retval = target_write_u32(target, 0x200b8004,
                    (page >> 16) & 0xff);
            if (retval != ERROR_OK) {
                LOG_ERROR("could not set MLC_ADDR");
                return ERROR_NAND_OPERATION_FAILED;
            }
        }
    } else {
        /* MLC_ADDR = 0x0 (two column cycles) */
        retval = target_write_u32(target, 0x200b8004, 0x0);
        if (retval != ERROR_OK) {
            LOG_ERROR("could not set MLC_ADDR");
            return ERROR_NAND_OPERATION_FAILED;
        }
        retval = target_write_u32(target, 0x200b8004, 0x0);
        if (retval != ERROR_OK) {
            LOG_ERROR("could not set MLC_ADDR");
            return ERROR_NAND_OPERATION_FAILED;
        }
 
        /* MLC_ADDR = row */
        retval = target_write_u32(target, 0x200b8004, page & 0xff);
        if (retval != ERROR_OK) {
            LOG_ERROR("could not set MLC_ADDR");
            return ERROR_NAND_OPERATION_FAILED;
        }
        retval = target_write_u32(target, 0x200b8004,
                (page >> 8) & 0xff);
        if (retval != ERROR_OK) {
            LOG_ERROR("could not set MLC_ADDR");
            return ERROR_NAND_OPERATION_FAILED;
        }
    }
 
    /* 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 */
        retval = target_write_u32(target, 0x200b8008, 0x0);
        if (retval != ERROR_OK) {
            LOG_ERROR("could not set MLC_ECC_ENC_REG");
            return ERROR_NAND_OPERATION_FAILED;
        }
 
        retval = target_write_memory(target, 0x200a8000,
                4, 128, page_buffer);
        if (retval != ERROR_OK) {
            LOG_ERROR("could not set MLC_BUF (data)");
            return ERROR_NAND_OPERATION_FAILED;
        }
        retval = target_write_memory(target, 0x200a8000,
                1, 6, oob_buffer);
        if (retval != ERROR_OK) {
            LOG_ERROR("could not set MLC_BUF (oob)");
            return ERROR_NAND_OPERATION_FAILED;
        }
 
        /* write MLC_ECC_AUTO_ENC_REG to start auto encode */
        retval = target_write_u32(target, 0x200b8010, 0x0);
        if (retval != ERROR_OK) {
            LOG_ERROR("could not set MLC_ECC_AUTO_ENC_REG");
            return ERROR_NAND_OPERATION_FAILED;
        }
 
        if (!lpc32xx_controller_ready(nand, 1000)) {
            LOG_ERROR("timeout while waiting for "
                "completion of auto encode cycle");
            return ERROR_NAND_OPERATION_FAILED;
        }
    }
 
    /* MLC_CMD = auto program command */
    retval = target_write_u32(target, 0x200b8000, NAND_CMD_PAGEPROG);
    if (retval != ERROR_OK) {
        LOG_ERROR("could not set MLC_CMD");
        return ERROR_NAND_OPERATION_FAILED;
    }
 
    retval = nand_read_status(nand, &status);
    if (retval != ERROR_OK) {
        LOG_ERROR("couldn't read status");
        return ERROR_NAND_OPERATION_FAILED;
    }
 
    if (status & NAND_STATUS_FAIL) {
        LOG_ERROR("write operation didn't pass, status: 0x%2.2x",
            status);
        return ERROR_NAND_OPERATION_FAILED;
    }
 
    return ERROR_OK;
}
 
/* SLC controller in !raw mode will use target cpu to read/write nand from/to
 * target internal memory.  The transfer to/from flash is done by DMA.  This
 * function sets up the dma linked list in host memory for later transfer to
 * target.
 */
static int lpc32xx_make_dma_list(uint32_t target_mem_base, uint32_t page_size,
    int do_read)
{
    uint32_t i, dmasrc, ctrl, ecc_ctrl, oob_ctrl, dmadst;
 
    /* 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, // set later
        Destination increment = 0, // set later
        Terminal count interrupt enable bit = 0 // set on last
    */          /*
     * Write Operation Sequence for Small Block NAND
     * ----------------------------------------------------------
     * 1. X'fer 256 bytes of data from Memory to Flash.
     * 2. Copy generated ECC data from Register to Spare Area
     * 3. X'fer next 256 bytes of data from Memory to Flash.
     * 4. Copy generated ECC data from Register to Spare Area.
     * 5. X'fer 16 bytes of Spare area from Memory to Flash.
     * Read Operation Sequence for Small Block NAND
     * ----------------------------------------------------------
     * 1. X'fer 256 bytes of data from Flash to Memory.
     * 2. Copy generated ECC data from Register to ECC calc Buffer.
     * 3. X'fer next 256 bytes of data from Flash to Memory.
     * 4. Copy generated ECC data from Register to ECC calc Buffer.
     * 5. X'fer 16 bytes of Spare area from Flash to Memory.
     * Write Operation Sequence for Large Block NAND
     * ----------------------------------------------------------
     * 1. Steps(1-4) of Write Operations repeated for four times
     * which generates 16 DMA descriptors to X'fer 2048 bytes of
     * data & 32 bytes of ECC data.
     * 2. X'fer 64 bytes of Spare area from Memory to Flash.
     * Read Operation Sequence for Large Block NAND
     * ----------------------------------------------------------
     * 1. Steps(1-4) of Read Operations repeated for four times
     * which generates 16 DMA descriptors to X'fer 2048 bytes of
     * data & 32 bytes of ECC data.
     * 2. X'fer 64 bytes of Spare area from Flash to Memory.
     */
 
    ctrl = (0x40 | 3 << 12 | 3 << 15 | 2 << 18 | 2 << 21 | 0 << 24
        | 0 << 25 | 0 << 26 | 0 << 27 | 0 << 31);
 
    /* 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
     */
    ecc_ctrl = 0x01 | 1 << 12 | 1 << 15 | 2 << 18 | 2 << 21 | 0 << 24
        | 0 << 25 | 0 << 26 | 1 << 27 | 0 << 31;
 
    /* DMACCxControl =
        TransferSize =16 for lp or 4 for sp,
        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, // set later
        Destination increment = 0, // set later
        Terminal count interrupt enable bit = 1 // set on last
     */
    oob_ctrl = (page_size == 2048 ? 0x10 : 0x04)
        | 3 << 12 | 3 << 15 | 2 << 18 | 2 << 21 | 0 << 24
        | 0 << 25 | 0 << 26 | 0 << 27 | 1 << 31;
    if (do_read) {
        ctrl |= 1 << 27;/* Destination increment = 1 */
        oob_ctrl |= 1 << 27;    /* Destination increment = 1 */
        dmasrc = 0x20020038;    /* SLC_DMA_DATA */
        dmadst = target_mem_base + DATA_OFFS;
    } else {
        ctrl |= 1 << 26;/* Source increment = 1 */
        oob_ctrl |= 1 << 26;    /* Source increment = 1 */
        dmasrc = target_mem_base + DATA_OFFS;
        dmadst = 0x20020038;    /* SLC_DMA_DATA */
    }
    /*
     * Write Operation Sequence for Small Block NAND
     * ----------------------------------------------------------
     * 1. X'fer 256 bytes of data from Memory to Flash.
     * 2. Copy generated ECC data from Register to Spare Area
     * 3. X'fer next 256 bytes of data from Memory to Flash.
     * 4. Copy generated ECC data from Register to Spare Area.
     * 5. X'fer 16 bytes of Spare area from Memory to Flash.
     * Read Operation Sequence for Small Block NAND
     * ----------------------------------------------------------
     * 1. X'fer 256 bytes of data from Flash to Memory.
     * 2. Copy generated ECC data from Register to ECC calc Buffer.
     * 3. X'fer next 256 bytes of data from Flash to Memory.
     * 4. Copy generated ECC data from Register to ECC calc Buffer.
     * 5. X'fer 16 bytes of Spare area from Flash to Memory.
     * Write Operation Sequence for Large Block NAND
     * ----------------------------------------------------------
     * 1. Steps(1-4) of Write Operations repeated for four times
     * which generates 16 DMA descriptors to X'fer 2048 bytes of
     * data & 32 bytes of ECC data.
     * 2. X'fer 64 bytes of Spare area from Memory to Flash.
     * Read Operation Sequence for Large Block NAND
     * ----------------------------------------------------------
     * 1. Steps(1-4) of Read Operations repeated for four times
     * which generates 16 DMA descriptors to X'fer 2048 bytes of
     * data & 32 bytes of ECC data.
     * 2. X'fer 64 bytes of Spare area from Flash to Memory.
     */
    for (i = 0; i < page_size/0x100; i++) {
        dmalist[i*2].dma_src = (do_read ? dmasrc : (dmasrc + i * 256));
        dmalist[i*2].dma_dest = (do_read ? (dmadst + i * 256) : dmadst);
        dmalist[i*2].next_lli =
            target_mem_base + (i*2 + 1) * sizeof(struct dmac_ll);
        dmalist[i*2].next_ctrl = ctrl;
 
        dmalist[(i*2) + 1].dma_src = 0x20020034;/* SLC_ECC */
        dmalist[(i*2) + 1].dma_dest =
            target_mem_base + ECC_OFFS + i * 4;
        dmalist[(i*2) + 1].next_lli =
            target_mem_base + (i*2 + 2) * sizeof(struct dmac_ll);
        dmalist[(i*2) + 1].next_ctrl = ecc_ctrl;
 
    }
    if (do_read)
        dmadst = target_mem_base + SPARE_OFFS;
    else {
        dmasrc = target_mem_base + SPARE_OFFS;
        dmalist[(i*2) - 1].next_lli = 0;/* last link = null on write */
        dmalist[(i*2) - 1].next_ctrl |= (1 << 31);  /* Set TC enable */
    }
    dmalist[i*2].dma_src = dmasrc;
    dmalist[i*2].dma_dest = dmadst;
    dmalist[i*2].next_lli = 0;
    dmalist[i*2].next_ctrl = oob_ctrl;
 
    return i * 2 + 1;   /* Number of descriptors */
}
 
static int lpc32xx_start_slc_dma(struct nand_device *nand, uint32_t count,
    int do_wait)
{
    struct target *target = nand->target;
    int retval;
 
    /* DMACIntTCClear = ch0 */
    retval = target_write_u32(target, 0x31000008, 1);
    if (retval != ERROR_OK) {
        LOG_ERROR("Could not set DMACIntTCClear");
        return retval;
    }
 
    /* DMACIntErrClear = ch0 */
    retval = target_write_u32(target, 0x31000010, 1);
    if (retval != ERROR_OK) {
        LOG_ERROR("Could not set DMACIntErrClear");
        return retval;
    }
 
    /* DMACCxConfig=
        E=1,
        SrcPeripheral = 1 (SLC),
        DestPeripheral = 1 (SLC),
        FlowCntrl = 2 (Pher -> Mem, DMA),
        IE = 0,
        ITC = 0,
        L= 0,
        H=0
    */
    retval = target_write_u32(target, 0x31000110,
            1 | 1<<1 | 1<<6 | 2<<11 | 0<<14
            | 0<<15 | 0<<16 | 0<<18);
    if (retval != ERROR_OK) {
        LOG_ERROR("Could not set DMACC0Config");
        return retval;
    }
 
    /* SLC_CTRL = 3 (START DMA), ECC_CLEAR */
    retval = target_write_u32(target, 0x20020010, 0x3);
    if (retval != ERROR_OK) {
        LOG_ERROR("Could not set SLC_CTRL");
        return retval;
    }
 
    /* SLC_ICR = 2, INT_TC_CLR, clear pending TC*/
    retval = target_write_u32(target, 0x20020028, 2);
    if (retval != ERROR_OK) {
        LOG_ERROR("Could not set SLC_ICR");
        return retval;
    }
 
    /* SLC_TC */
    retval = target_write_u32(target, 0x20020030, count);
    if (retval != ERROR_OK) {
        LOG_ERROR("lpc32xx_start_slc_dma: Could not set SLC_TC");
        return retval;
    }
 
    /* Wait finish */
    if (do_wait && !lpc32xx_tc_ready(nand, 100)) {
        LOG_ERROR("timeout while waiting for completion of DMA");
        return ERROR_NAND_OPERATION_FAILED;
    }
 
    return retval;
}
 
static int lpc32xx_dma_ready(struct nand_device *nand, int timeout)
{
    struct target *target = nand->target;
 
    LOG_DEBUG("lpc32xx_dma_ready count start=%d", timeout);
 
    do {
        uint32_t tc_stat;
        uint32_t err_stat;
        int retval;
 
        /* Read DMACRawIntTCStat */
        retval = target_read_u32(target, 0x31000014, &tc_stat);
        if (retval != ERROR_OK) {
            LOG_ERROR("Could not read DMACRawIntTCStat");
            return 0;
        }
        /* Read DMACRawIntErrStat */
        retval = target_read_u32(target, 0x31000018, &err_stat);
        if (retval != ERROR_OK) {
            LOG_ERROR("Could not read DMACRawIntErrStat");
            return 0;
        }
        if ((tc_stat | err_stat) & 1) {
            LOG_DEBUG("lpc32xx_dma_ready count=%d",
                timeout);
            if (err_stat & 1) {
                LOG_ERROR("lpc32xx_dma_ready "
                    "DMA error, aborted");
                return 0;
            } else
                return 1;
        }
 
        alive_sleep(1);
    } while (timeout-- > 0);
 
    return 0;
}
 
static uint32_t slc_ecc_copy_to_buffer(uint8_t *spare,
    const uint32_t *ecc, int count)
{
    int i;
    for (i = 0; i < (count * 3); i += 3) {
        uint32_t ce = ecc[i/3];
        ce = ~(ce << 2) & 0xFFFFFF;
        spare[i+2] = (uint8_t)(ce & 0xFF); ce >>= 8;
        spare[i+1] = (uint8_t)(ce & 0xFF); ce >>= 8;
        spare[i]   = (uint8_t)(ce & 0xFF);
    }
    return 0;
}
 
static void lpc32xx_dump_oob(uint8_t *oob, uint32_t oob_size)
{
    int addr = 0;
    while (oob_size > 0) {
        LOG_DEBUG("%02x: %02x %02x %02x %02x %02x %02x %02x %02x", addr,
            oob[0], oob[1], oob[2], oob[3],
            oob[4], oob[5], oob[6], oob[7]);
        oob += 8;
        addr += 8;
        oob_size -= 8;
    }
}
 
static int lpc32xx_write_page_slc(struct nand_device *nand,
    struct working_area *pworking_area,
    uint32_t page, uint8_t *data,
    uint32_t data_size, uint8_t *oob,
    uint32_t oob_size)
{
    struct target *target = nand->target;
    int retval;
    uint32_t target_mem_base;
 
    LOG_DEBUG("SLC write page %" PRIx32 " data=%d, oob=%d, "
        "data_size=%" PRIu32 ", oob_size=%" PRIu32,
        page, !!data, !!oob, data_size, oob_size);
 
    target_mem_base = pworking_area->address;
    /*
     * Skip writing page which has all 0xFF data as this will
     * generate 0x0 value.
     */
    if (data && !oob) {
        uint32_t i, all_ff = 1;
        for (i = 0; i < data_size; i++)
            if (data[i] != 0xFF) {
                all_ff = 0;
                break;
            }
        if (all_ff)
            return ERROR_OK;
    }
    /* Make the dma descriptors in local memory */
    int nll = lpc32xx_make_dma_list(target_mem_base, nand->page_size, 0);
    /* Write them to target.
       XXX: Assumes host and target have same byte sex.
    */
    retval = target_write_memory(target, target_mem_base, 4,
            nll * sizeof(struct dmac_ll) / 4,
            (uint8_t *)dmalist);
    if (retval != ERROR_OK) {
        LOG_ERROR("Could not write DMA descriptors to IRAM");
        return retval;
    }
 
    retval = nand_page_command(nand, page, NAND_CMD_SEQIN, !data);
    if (retval != ERROR_OK) {
        LOG_ERROR("NAND_CMD_SEQIN failed");
        return retval;
    }
 
    /* SLC_CFG =
           Force nCE assert,
           DMA ECC enabled,
           ECC enabled,
           DMA burst enabled,
           DMA write to SLC,
           WIDTH = bus_width
    */
    retval = target_write_u32(target, 0x20020014, 0x3c);
    if (retval != ERROR_OK) {
        LOG_ERROR("Could not set SLC_CFG");
        return retval;
    }
    if (data) {
        /* Write data to target */
        static uint8_t fdata[2048];
        memset(fdata, 0xFF, nand->page_size);
        memcpy(fdata, data, data_size);
        retval = target_write_memory(target,
                target_mem_base + DATA_OFFS,
                4, nand->page_size/4, fdata);
        if (retval != ERROR_OK) {
            LOG_ERROR("Could not write data to IRAM");
            return retval;
        }
 
        /* Write first descriptor to DMA controller */
        retval = target_write_memory(target, 0x31000100, 4,
                sizeof(struct dmac_ll) / 4,
                (uint8_t *)dmalist);
        if (retval != ERROR_OK) {
            LOG_ERROR("Could not write DMA descriptor to DMAC");
            return retval;
        }
 
        /* Start xfer of data from iram to flash using DMA */
        int tot_size = nand->page_size;
        tot_size += tot_size == 2048 ? 64 : 16;
        retval = lpc32xx_start_slc_dma(nand, tot_size, 0);
        if (retval != ERROR_OK) {
            LOG_ERROR("DMA failed");
            return retval;
        }
 
        /* Wait for DMA to finish.  SLC is not finished at this stage */
        if (!lpc32xx_dma_ready(nand, 100)) {
            LOG_ERROR("Data DMA failed during write");
            return ERROR_FLASH_OPERATION_FAILED;
        }
    }   /* data xfer */
 
    /* Copy OOB to iram */
    static uint8_t foob[64];
    int foob_size = nand->page_size == 2048 ? 64 : 16;
    memset(foob, 0xFF, foob_size);
    if (oob)    /* Raw mode */
        memcpy(foob, oob, oob_size);
    else {
        /* Get HW generated ECC, made while writing data */
        int ecc_count = nand->page_size == 2048 ? 8 : 2;
        static uint32_t hw_ecc[8];
        retval = target_read_memory(target, target_mem_base + ECC_OFFS,
                4, ecc_count, (uint8_t *)hw_ecc);
        if (retval != ERROR_OK) {
            LOG_ERROR("Reading hw generated ECC from IRAM failed");
            return retval;
        }
        /* Copy to oob, at correct offsets */
        static uint8_t ecc[24];
        slc_ecc_copy_to_buffer(ecc, hw_ecc, ecc_count);
        const int *layout = nand->page_size == 2048 ? lp_ooblayout : sp_ooblayout;
        int i;
        for (i = 0; i < ecc_count * 3; i++)
            foob[layout[i]] = ecc[i];
        lpc32xx_dump_oob(foob, foob_size);
    }
    retval = target_write_memory(target, target_mem_base + SPARE_OFFS, 4,
            foob_size / 4, foob);
    if (retval != ERROR_OK) {
        LOG_ERROR("Writing OOB to IRAM failed");
        return retval;
    }
 
    /* Write OOB descriptor to DMA controller */
    retval = target_write_memory(target, 0x31000100, 4,
            sizeof(struct dmac_ll) / 4,
            (uint8_t *)(&dmalist[nll-1]));
    if (retval != ERROR_OK) {
        LOG_ERROR("Could not write OOB DMA descriptor to DMAC");
        return retval;
    }
    if (data) {
        /* Only restart DMA with last descriptor,
         * don't setup SLC again */
 
        /* DMACIntTCClear = ch0 */
        retval = target_write_u32(target, 0x31000008, 1);
        if (retval != ERROR_OK) {
            LOG_ERROR("Could not set DMACIntTCClear");
            return retval;
        }
        /* DMACCxConfig=
         * E=1,
         * SrcPeripheral = 1 (SLC),
         * DestPeripheral = 1 (SLC),
         * FlowCntrl = 2 (Pher -> Mem, DMA),
         * IE = 0,
         * ITC = 0,
         * L= 0,
         * H=0
        */
        retval = target_write_u32(target, 0x31000110,
                1 | 1<<1 | 1<<6 | 2<<11 | 0<<14
                | 0<<15 | 0<<16 | 0<<18);
        if (retval != ERROR_OK) {
            LOG_ERROR("Could not set DMACC0Config");
            return retval;
        }
        /* Wait finish */
        if (!lpc32xx_tc_ready(nand, 100)) {
            LOG_ERROR("timeout while waiting for "
                "completion of DMA");
            return ERROR_NAND_OPERATION_FAILED;
        }
    } else {
        /* Start xfer of data from iram to flash using DMA */
        retval = lpc32xx_start_slc_dma(nand, foob_size, 1);
        if (retval != ERROR_OK) {
            LOG_ERROR("DMA OOB failed");
            return retval;
        }
    }
 
    /* Let NAND start actual writing */
    retval = nand_write_finish(nand);
    if (retval != ERROR_OK) {
        LOG_ERROR("nand_write_finish failed");
        return retval;
    }
 
    return ERROR_OK;
}
 
static int lpc32xx_write_page(struct nand_device *nand, uint32_t page,
    uint8_t *data, uint32_t data_size,
    uint8_t *oob, uint32_t oob_size)
{
    struct lpc32xx_nand_controller *lpc32xx_info = nand->controller_priv;
    struct target *target = nand->target;
    int retval = ERROR_OK;
 
    if (target->state != TARGET_HALTED) {
        LOG_ERROR("target must be halted to use LPC32xx "
            "NAND flash controller");
        return ERROR_NAND_OPERATION_FAILED;
    }
 
    if (lpc32xx_info->selected_controller == LPC32XX_NO_CONTROLLER) {
        LOG_ERROR("BUG: no LPC32xx NAND flash controller selected");
        return ERROR_NAND_OPERATION_FAILED;
    } else if (lpc32xx_info->selected_controller == LPC32XX_MLC_CONTROLLER) {
        if (!data && oob) {
            LOG_ERROR("LPC32xx MLC controller can't write "
                "OOB data only");
            return ERROR_NAND_OPERATION_NOT_SUPPORTED;
        }
 
        if (oob && (oob_size > 24)) {
            LOG_ERROR("LPC32xx 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;
        }
 
        retval = lpc32xx_write_page_mlc(nand, page, data, data_size,
                oob, oob_size);
    } else if (lpc32xx_info->selected_controller == LPC32XX_SLC_CONTROLLER) {
        struct working_area *pworking_area;
        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 = target_alloc_working_area(target,
                nand->page_size + DATA_OFFS,
                &pworking_area);
        if (retval != ERROR_OK) {
            LOG_ERROR("Can't allocate working area in "
                "LPC internal RAM");
            return ERROR_FLASH_OPERATION_FAILED;
        }
        retval = lpc32xx_write_page_slc(nand, pworking_area, page,
                data, data_size, oob, oob_size);
        target_free_working_area(target, pworking_area);
    }
 
    return retval;
}
 
static int lpc32xx_read_page_mlc(struct nand_device *nand, uint32_t page,
    uint8_t *data, uint32_t data_size,
    uint8_t *oob, uint32_t oob_size)
{
    struct target *target = nand->target;
    static uint8_t page_buffer[2048];
    static uint8_t oob_buffer[64];
    uint32_t page_bytes_done = 0;
    uint32_t oob_bytes_done = 0;
    uint32_t mlc_isr;
    int retval;
 
    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
         */
        retval = target_write_u32(target, 0x200b8000, NAND_CMD_READOOB);
    } else {
        /* MLC_CMD = Read0 */
        retval = target_write_u32(target, 0x200b8000, NAND_CMD_READ0);
    }
    if (retval != ERROR_OK) {
        LOG_ERROR("could not set MLC_CMD");
        return ERROR_NAND_OPERATION_FAILED;
    }
    if (nand->page_size == 512) {
        /* small page device
         * MLC_ADDR = 0x0 (one column cycle) */
        retval = target_write_u32(target, 0x200b8004, 0x0);
        if (retval != ERROR_OK) {
            LOG_ERROR("could not set MLC_ADDR");
            return ERROR_NAND_OPERATION_FAILED;
        }
 
        /* MLC_ADDR = row */
        retval = target_write_u32(target, 0x200b8004, page & 0xff);
        if (retval != ERROR_OK) {
            LOG_ERROR("could not set MLC_ADDR");
            return ERROR_NAND_OPERATION_FAILED;
        }
        retval = target_write_u32(target, 0x200b8004,
                (page >> 8) & 0xff);
        if (retval != ERROR_OK) {
            LOG_ERROR("could not set MLC_ADDR");
            return ERROR_NAND_OPERATION_FAILED;
        }
 
        if (nand->address_cycles == 4) {
            retval = target_write_u32(target, 0x200b8004,
                    (page >> 16) & 0xff);
            if (retval != ERROR_OK) {
                LOG_ERROR("could not set MLC_ADDR");
                return ERROR_NAND_OPERATION_FAILED;
            }
        }
    } else {
        /* large page device
         * MLC_ADDR = 0x0 (two column cycles) */
        retval = target_write_u32(target, 0x200b8004, 0x0);
        if (retval != ERROR_OK) {
            LOG_ERROR("could not set MLC_ADDR");
            return ERROR_NAND_OPERATION_FAILED;
        }
        retval = target_write_u32(target, 0x200b8004, 0x0);
        if (retval != ERROR_OK) {
            LOG_ERROR("could not set MLC_ADDR");
            return ERROR_NAND_OPERATION_FAILED;
        }
 
        /* MLC_ADDR = row */
        retval = target_write_u32(target, 0x200b8004, page & 0xff);
        if (retval != ERROR_OK) {
            LOG_ERROR("could not set MLC_ADDR");
            return ERROR_NAND_OPERATION_FAILED;
        }
        retval = target_write_u32(target, 0x200b8004,
                (page >> 8) & 0xff);
        if (retval != ERROR_OK) {
            LOG_ERROR("could not set MLC_ADDR");
            return ERROR_NAND_OPERATION_FAILED;
        }
 
        /* MLC_CMD = Read Start */
        retval = target_write_u32(target, 0x200b8000,
                NAND_CMD_READSTART);
        if (retval != ERROR_OK) {
            LOG_ERROR("could not set MLC_CMD");
            return ERROR_NAND_OPERATION_FAILED;
        }
    }
 
    while (page_bytes_done < (uint32_t)nand->page_size) {
        /* MLC_ECC_AUTO_DEC_REG = dummy */
        retval = target_write_u32(target, 0x200b8014, 0xaa55aa55);
        if (retval != ERROR_OK) {
            LOG_ERROR("could not set MLC_ECC_AUTO_DEC_REG");
            return ERROR_NAND_OPERATION_FAILED;
        }
 
        if (!lpc32xx_controller_ready(nand, 1000)) {
            LOG_ERROR("timeout while waiting for "
                "completion of auto decode cycle");
            return ERROR_NAND_OPERATION_FAILED;
        }
 
        retval = target_read_u32(target, 0x200b8048, &mlc_isr);
        if (retval != ERROR_OK) {
            LOG_ERROR("could not read MLC_ISR");
            return ERROR_NAND_OPERATION_FAILED;
        }
 
        if (mlc_isr & 0x8) {
            if (mlc_isr & 0x40) {
                LOG_ERROR("uncorrectable error detected: 0x%2.2" PRIx32, mlc_isr);
                return ERROR_NAND_OPERATION_FAILED;
            }
 
            LOG_WARNING("%i symbol error detected and corrected",
                ((int)(((mlc_isr & 0x30) >> 4) + 1)));
        }
 
        if (data) {
            retval = target_read_memory(target, 0x200a8000, 4, 128,
                    page_buffer + page_bytes_done);
            if (retval != ERROR_OK) {
                LOG_ERROR("could not read MLC_BUF (data)");
                return ERROR_NAND_OPERATION_FAILED;
            }
        }
 
        if (oob) {
            retval = target_read_memory(target, 0x200a8000, 4, 4,
                    oob_buffer + oob_bytes_done);
            if (retval != ERROR_OK) {
                LOG_ERROR("could not read MLC_BUF (oob)");
                return ERROR_NAND_OPERATION_FAILED;
            }
        }
 
        page_bytes_done += 512;
        oob_bytes_done += 16;
    }
 
    if (data)
        memcpy(data, page_buffer, data_size);
 
    if (oob)
        memcpy(oob, oob_buffer, oob_size);
 
    return ERROR_OK;
}
 
static int lpc32xx_read_page_slc(struct nand_device *nand,
    struct working_area *pworking_area,
    uint32_t page, uint8_t *data,
    uint32_t data_size, uint8_t *oob,
    uint32_t oob_size)
{
    struct target *target = nand->target;
    int retval;
    uint32_t target_mem_base;
 
    LOG_DEBUG("SLC read page %" PRIx32 " data=%" PRIu32 ", oob=%" PRIu32,
        page, data_size, oob_size);
 
    target_mem_base = pworking_area->address;
 
    /* Make the dma descriptors in local memory */
    int nll = lpc32xx_make_dma_list(target_mem_base, nand->page_size, 1);
    /* Write them to target.
       XXX: Assumes host and target have same byte sex.
    */
    retval = target_write_memory(target, target_mem_base, 4,
            nll * sizeof(struct dmac_ll) / 4,
            (uint8_t *)dmalist);
    if (retval != ERROR_OK) {
        LOG_ERROR("Could not write DMA descriptors to IRAM");
        return retval;
    }
 
    retval = nand_page_command(nand, page, NAND_CMD_READ0, 0);
    if (retval != ERROR_OK) {
        LOG_ERROR("lpc32xx_read_page_slc: NAND_CMD_READ0 failed");
        return retval;
    }
 
    /* SLC_CFG =
           Force nCE assert,
           DMA ECC enabled,
           ECC enabled,
           DMA burst enabled,
           DMA read from SLC,
           WIDTH = bus_width
    */
    retval = target_write_u32(target, 0x20020014, 0x3e);
    if (retval != ERROR_OK) {
        LOG_ERROR("lpc32xx_read_page_slc: Could not set SLC_CFG");
        return retval;
    }
 
    /* Write first descriptor to DMA controller */
    retval = target_write_memory(target, 0x31000100, 4,
            sizeof(struct dmac_ll) / 4, (uint8_t *)dmalist);
    if (retval != ERROR_OK) {
        LOG_ERROR("Could not write DMA descriptor to DMAC");
        return retval;
    }
 
    /* Start xfer of data from flash to iram using DMA */
    int tot_size = nand->page_size;
    tot_size += nand->page_size == 2048 ? 64 : 16;
    retval = lpc32xx_start_slc_dma(nand, tot_size, 1);
    if (retval != ERROR_OK) {
        LOG_ERROR("lpc32xx_read_page_slc: DMA read failed");
        return retval;
    }
 
    /* Copy data from iram */
    if (data) {
        retval = target_read_memory(target, target_mem_base + DATA_OFFS,
                4, data_size/4, data);
        if (retval != ERROR_OK) {
            LOG_ERROR("Could not read data from IRAM");
            return retval;
        }
    }
    if (oob) {
        /* No error correction, just return data as read from flash */
        retval = target_read_memory(target,
                target_mem_base + SPARE_OFFS, 4,
                oob_size/4, oob);
        if (retval != ERROR_OK) {
            LOG_ERROR("Could not read OOB from IRAM");
            return retval;
        }
        return ERROR_OK;
    }
 
    /* Copy OOB from flash, stored in IRAM */
    static uint8_t foob[64];
    retval = target_read_memory(target, target_mem_base + SPARE_OFFS,
            4, nand->page_size == 2048 ? 16 : 4, foob);
    lpc32xx_dump_oob(foob, nand->page_size == 2048 ? 64 : 16);
    if (retval != ERROR_OK) {
        LOG_ERROR("Could not read OOB from IRAM");
        return retval;
    }
    /* Copy ECC from HW, generated while reading */
    int ecc_count = nand->page_size == 2048 ? 8 : 2;
    static uint32_t hw_ecc[8];  /* max size */
    retval = target_read_memory(target, target_mem_base + ECC_OFFS, 4,
            ecc_count, (uint8_t *)hw_ecc);
    if (retval != ERROR_OK) {
        LOG_ERROR("Could not read hw generated ECC from IRAM");
        return retval;
    }
    static uint8_t ecc[24];
    slc_ecc_copy_to_buffer(ecc, hw_ecc, ecc_count);
    /* Copy ECC from flash using correct layout */
    static uint8_t fecc[24];/* max size */
    const int *layout = nand->page_size == 2048 ? lp_ooblayout : sp_ooblayout;
    int i;
    for (i = 0; i < ecc_count * 3; i++)
        fecc[i] = foob[layout[i]];
    /* Compare ECC and possibly correct data */
    for (i = 0; i < ecc_count; i++) {
        retval = nand_correct_data(nand, data + 256*i, &fecc[i * 3],
                &ecc[i * 3]);
        if (retval > 0)
            LOG_WARNING("error detected and corrected: %" PRIu32 "/%d",
                page, i);
        if (retval < 0)
            break;
    }
    if (i == ecc_count)
        retval = ERROR_OK;
    else {
        LOG_ERROR("uncorrectable error detected: %" PRIu32 "/%d", page, i);
        retval = ERROR_NAND_OPERATION_FAILED;
    }
    return retval;
}
 
static int lpc32xx_read_page(struct nand_device *nand, uint32_t page,
    uint8_t *data, uint32_t data_size,
    uint8_t *oob, uint32_t oob_size)
{
    struct lpc32xx_nand_controller *lpc32xx_info = nand->controller_priv;
    struct target *target = nand->target;
    int retval = ERROR_OK;
 
    if (target->state != TARGET_HALTED) {
        LOG_ERROR("target must be halted to use LPC32xx "
            "NAND flash controller");
        return ERROR_NAND_OPERATION_FAILED;
    }
 
    if (lpc32xx_info->selected_controller == LPC32XX_NO_CONTROLLER) {
        LOG_ERROR("BUG: no LPC32xx NAND flash controller selected");
        return ERROR_NAND_OPERATION_FAILED;
    } else if (lpc32xx_info->selected_controller == LPC32XX_MLC_CONTROLLER) {
        if (data_size > (uint32_t)nand->page_size) {
            LOG_ERROR("data size exceeds page size");
            return ERROR_NAND_OPERATION_NOT_SUPPORTED;
        }
        retval = lpc32xx_read_page_mlc(nand, page, data, data_size,
                oob, oob_size);
    } else if (lpc32xx_info->selected_controller == LPC32XX_SLC_CONTROLLER) {
        struct working_area *pworking_area;
 
        retval = target_alloc_working_area(target,
                nand->page_size + 0x200,
                &pworking_area);
        if (retval != ERROR_OK) {
            LOG_ERROR("Can't allocate working area in "
                "LPC internal RAM");
            return ERROR_FLASH_OPERATION_FAILED;
        }
        retval = lpc32xx_read_page_slc(nand, pworking_area, page,
                data, data_size, oob, oob_size);
        target_free_working_area(target, pworking_area);
    }
 
    return retval;
}
 
static int lpc32xx_controller_ready(struct nand_device *nand, int timeout)
{
    struct lpc32xx_nand_controller *lpc32xx_info = nand->controller_priv;
    struct target *target = nand->target;
    int retval;
 
    if (target->state != TARGET_HALTED) {
        LOG_ERROR("target must be halted to use LPC32xx "
            "NAND flash controller");
        return ERROR_NAND_OPERATION_FAILED;
    }
 
    LOG_DEBUG("lpc32xx_controller_ready count start=%d", timeout);
 
    do {
        if (lpc32xx_info->selected_controller == LPC32XX_MLC_CONTROLLER) {
            uint8_t status;
 
            /* Read MLC_ISR, wait for controller to become ready */
            retval = target_read_u8(target, 0x200b8048, &status);
            if (retval != ERROR_OK) {
                LOG_ERROR("could not set MLC_STAT");
                return ERROR_NAND_OPERATION_FAILED;
            }
 
            if (status & 2) {
                LOG_DEBUG("lpc32xx_controller_ready count=%d",
                    timeout);
                return 1;
            }
        } else if (lpc32xx_info->selected_controller == LPC32XX_SLC_CONTROLLER) {
            uint32_t status;
 
            /* Read SLC_STAT and check READY bit */
            retval = target_read_u32(target, 0x20020018, &status);
            if (retval != ERROR_OK) {
                LOG_ERROR("could not set SLC_STAT");
                return ERROR_NAND_OPERATION_FAILED;
            }
 
            if (status & 1) {
                LOG_DEBUG("lpc32xx_controller_ready count=%d",
                    timeout);
                return 1;
            }
        }
 
        alive_sleep(1);
    } while (timeout-- > 0);
 
    return 0;
}
 
static int lpc32xx_nand_ready(struct nand_device *nand, int timeout)
{
    struct lpc32xx_nand_controller *lpc32xx_info = nand->controller_priv;
    struct target *target = nand->target;
    int retval;
 
    if (target->state != TARGET_HALTED) {
        LOG_ERROR("target must be halted to use LPC32xx "
            "NAND flash controller");
        return ERROR_NAND_OPERATION_FAILED;
    }
 
    LOG_DEBUG("lpc32xx_nand_ready count start=%d", timeout);
 
    do {
        if (lpc32xx_info->selected_controller == LPC32XX_MLC_CONTROLLER) {
            uint8_t status = 0x0;
 
            /* Read MLC_ISR, wait for NAND flash device to
             * become ready */
            retval = target_read_u8(target, 0x200b8048, &status);
            if (retval != ERROR_OK) {
                LOG_ERROR("could not read MLC_ISR");
                return ERROR_NAND_OPERATION_FAILED;
            }
 
            if (status & 1) {
                LOG_DEBUG("lpc32xx_nand_ready count end=%d",
                    timeout);
                return 1;
            }
        } else if (lpc32xx_info->selected_controller == LPC32XX_SLC_CONTROLLER) {
            uint32_t status = 0x0;
 
            /* Read SLC_STAT and check READY bit */
            retval = target_read_u32(target, 0x20020018, &status);
            if (retval != ERROR_OK) {
                LOG_ERROR("could not read SLC_STAT");
                return ERROR_NAND_OPERATION_FAILED;
            }
 
            if (status & 1) {
                LOG_DEBUG("lpc32xx_nand_ready count end=%d",
                    timeout);
                return 1;
            }
        }
 
        alive_sleep(1);
    } while (timeout-- > 0);
 
    return 0;
}
 
static int lpc32xx_tc_ready(struct nand_device *nand, int timeout)
{
    struct target *target = nand->target;
 
    LOG_DEBUG("lpc32xx_tc_ready count start=%d", timeout);
 
    do {
        uint32_t status = 0x0;
        int retval;
        /* Read SLC_INT_STAT and check INT_TC_STAT bit */
        retval = target_read_u32(target, 0x2002001c, &status);
        if (retval != ERROR_OK) {
            LOG_ERROR("Could not read SLC_INT_STAT");
            return 0;
        }
        if (status & 2) {
            LOG_DEBUG("lpc32xx_tc_ready count=%d", timeout);
            return 1;
        }
 
        alive_sleep(1);
    } while (timeout-- > 0);
 
    return 0;
}
 
COMMAND_HANDLER(handle_lpc32xx_select_command)
{
    struct lpc32xx_nand_controller *lpc32xx_info = NULL;
    char *selected[] = {
        "no", "mlc", "slc"
    };
 
    if ((CMD_ARGC < 1) || (CMD_ARGC > 3))
        return ERROR_COMMAND_SYNTAX_ERROR;
 
    unsigned int 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;
    }
 
    lpc32xx_info = nand->controller_priv;
 
    if (CMD_ARGC >= 2) {
        if (strcmp(CMD_ARGV[1], "mlc") == 0) {
            lpc32xx_info->selected_controller =
                LPC32XX_MLC_CONTROLLER;
        } else if (strcmp(CMD_ARGV[1], "slc") == 0) {
            lpc32xx_info->selected_controller =
                LPC32XX_SLC_CONTROLLER;
        } else
            return ERROR_COMMAND_SYNTAX_ERROR;
    }
 
    command_print(CMD, "%s controller selected",
        selected[lpc32xx_info->selected_controller]);
 
    return ERROR_OK;
}
 
static const struct command_registration lpc32xx_exec_command_handlers[] = {
    {
        .name = "select",
        .handler = handle_lpc32xx_select_command,
        .mode = COMMAND_EXEC,
        .help = "select MLC or SLC controller (default is MLC)",
        .usage = "bank_id ['mlc'|'slc' ]",
    },
    COMMAND_REGISTRATION_DONE
};
static const struct command_registration lpc32xx_command_handler[] = {
    {
        .name = "lpc32xx",
        .mode = COMMAND_ANY,
        .help = "LPC32xx NAND flash controller commands",
        .usage = "",
        .chain = lpc32xx_exec_command_handlers,
    },
    COMMAND_REGISTRATION_DONE
};
 
struct nand_flash_controller lpc32xx_nand_controller = {
    .name = "lpc32xx",
    .commands = lpc32xx_command_handler,
    .nand_device_command = lpc32xx_nand_device_command,
    .init = lpc32xx_init,
    .reset = lpc32xx_reset,
    .command = lpc32xx_command,
    .address = lpc32xx_address,
    .write_data = lpc32xx_write_data,
    .read_data = lpc32xx_read_data,
    .write_page = lpc32xx_write_page,
    .read_page = lpc32xx_read_page,
    .nand_ready = lpc32xx_nand_ready,
};