// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2017-2019 Intel Corporation <www.intel.com>
 */
#include <image.h>
#include <log.h>
#include <asm/global_data.h>
#include <asm/io.h>
#include <asm/arch/fpga_manager.h>
#include <asm/arch/reset_manager.h>
#include <asm/arch/system_manager.h>
#include <asm/arch/sdram.h>
#include <asm/arch/misc.h>
#include <altera.h>
#include <asm/arch/pinmux.h>
#include <common.h>
#include <dm.h>
#include <dm/ofnode.h>
#include <errno.h>
#include <fs_loader.h>
#include <wait_bit.h>
#include <watchdog.h>
#include <linux/bitops.h>
#include <linux/delay.h>

#define CFGWDTH_32      1
#define MIN_BITSTREAM_SIZECHECK 230
#define ENCRYPTION_OFFSET       69
#define COMPRESSION_OFFSET      229
#define FPGA_TIMEOUT_MSEC       1000  /* timeout in ms */
#define FPGA_TIMEOUT_CNT        0x1000000
#define DEFAULT_DDR_LOAD_ADDRESS        0x400
#define DDR_BUFFER_SIZE         0x100000

/* When reading bitstream from a filesystem, the size of the first read is
 * changed so that the subsequent reads are aligned to this value. This value
 * was chosen so that in subsequent reads the fat fs driver doesn't have to
 * allocate a temporary buffer in get_contents (assuming 8KiB clusters).
 */
#define MAX_FIRST_LOAD_SIZE     0x2000

DECLARE_GLOBAL_DATA_PTR;

static const struct socfpga_fpga_manager *fpga_manager_base =
                (void *)SOCFPGA_FPGAMGRREGS_ADDRESS;

static void fpgamgr_set_cd_ratio(unsigned long ratio);

static uint32_t fpgamgr_get_msel(void)
{
        u32 reg;

        reg = readl(&fpga_manager_base->imgcfg_stat);
        reg = (reg & ALT_FPGAMGR_IMGCFG_STAT_F2S_MSEL_SET_MSD) >>
                ALT_FPGAMGR_IMGCFG_STAT_F2S_MSEL0_LSB;

        return reg;
}

static void fpgamgr_set_cfgwdth(int width)
{
        if (width)
                setbits_le32(&fpga_manager_base->imgcfg_ctrl_02,
                        ALT_FPGAMGR_IMGCFG_CTL_02_CFGWIDTH_SET_MSK);
        else
                clrbits_le32(&fpga_manager_base->imgcfg_ctrl_02,
                        ALT_FPGAMGR_IMGCFG_CTL_02_CFGWIDTH_SET_MSK);
}

int is_fpgamgr_user_mode(void)
{
        return (readl(&fpga_manager_base->imgcfg_stat) &
                ALT_FPGAMGR_IMGCFG_STAT_F2S_USERMODE_SET_MSK) != 0;
}

static int wait_for_user_mode(void)
{
        return wait_for_bit_le32(&fpga_manager_base->imgcfg_stat,
                ALT_FPGAMGR_IMGCFG_STAT_F2S_USERMODE_SET_MSK,
                1, FPGA_TIMEOUT_MSEC, false);
}

static int wait_for_fifo_empty(void)
{
        return wait_for_bit_le32(&fpga_manager_base->imgcfg_stat,
                ALT_FPGAMGR_IMGCFG_STAT_F2S_IMGCFG_FIFOEMPTY_SET_MSK,
                1, FPGA_TIMEOUT_MSEC, false);
}

int is_fpgamgr_early_user_mode(void)
{
        return (readl(&fpga_manager_base->imgcfg_stat) &
                ALT_FPGAMGR_IMGCFG_STAT_F2S_EARLY_USERMODE_SET_MSK) != 0;
}

int fpgamgr_wait_early_user_mode(void)
{
        u32 sync_data = 0xffffffff;
        u32 i = 0;
        unsigned start = get_timer(0);
        unsigned long cd_ratio;

        /* Getting existing CDRATIO */
        cd_ratio = (readl(&fpga_manager_base->imgcfg_ctrl_02) &
                ALT_FPGAMGR_IMGCFG_CTL_02_CDRATIO_SET_MSK) >>
                ALT_FPGAMGR_IMGCFG_CTL_02_CDRATIO_LSB;

        /* Using CDRATIO_X1 for better compatibility */
        fpgamgr_set_cd_ratio(CDRATIO_x1);

        while (!is_fpgamgr_early_user_mode()) {
                if (get_timer(start) > FPGA_TIMEOUT_MSEC)
                        return -ETIMEDOUT;
                fpgamgr_program_write((const long unsigned int *)&sync_data,
                                sizeof(sync_data));
                udelay(FPGA_TIMEOUT_MSEC);
                i++;
        }

        debug("FPGA: Additional %i sync word needed\n", i);

        /* restoring original CDRATIO */
        fpgamgr_set_cd_ratio(cd_ratio);

        return 0;
}

/* Read f2s_nconfig_pin and f2s_nstatus_pin; loop until de-asserted */
static int wait_for_nconfig_pin_and_nstatus_pin(void)
{
        unsigned long mask = ALT_FPGAMGR_IMGCFG_STAT_F2S_NCONFIG_PIN_SET_MSK |
                                ALT_FPGAMGR_IMGCFG_STAT_F2S_NSTATUS_PIN_SET_MSK;

        /*
         * Poll until f2s_nconfig_pin and f2s_nstatus_pin; loop until
         * de-asserted, timeout at 1000ms
         */
        return wait_for_bit_le32(&fpga_manager_base->imgcfg_stat, mask,
                                 true, FPGA_TIMEOUT_MSEC, false);
}

static int wait_for_f2s_nstatus_pin(unsigned long value)
{
        /* Poll until f2s to specific value, timeout at 1000ms */
        return wait_for_bit_le32(&fpga_manager_base->imgcfg_stat,
                ALT_FPGAMGR_IMGCFG_STAT_F2S_NSTATUS_PIN_SET_MSK,
                value, FPGA_TIMEOUT_MSEC, false);
}

/* set CD ratio */
static void fpgamgr_set_cd_ratio(unsigned long ratio)
{
        clrbits_le32(&fpga_manager_base->imgcfg_ctrl_02,
                ALT_FPGAMGR_IMGCFG_CTL_02_CDRATIO_SET_MSK);

        setbits_le32(&fpga_manager_base->imgcfg_ctrl_02,
                (ratio << ALT_FPGAMGR_IMGCFG_CTL_02_CDRATIO_LSB) &
                ALT_FPGAMGR_IMGCFG_CTL_02_CDRATIO_SET_MSK);
}

/* get the MSEL value, verify we are set for FPP configuration mode */
static int fpgamgr_verify_msel(void)
{
        u32 msel = fpgamgr_get_msel();

        if (msel & ~BIT(0)) {
                printf("Fail: read msel=%d\n", msel);
                return -EPERM;
        }

        return 0;
}

/*
 * Write cdratio and cdwidth based on whether the bitstream is compressed
 * and/or encoded
 */
static int fpgamgr_set_cdratio_cdwidth(unsigned int cfg_width, u32 *rbf_data,
                                       size_t rbf_size)
{
        unsigned int cd_ratio;
        bool encrypt, compress;

        /*
         * According to the bitstream specification,
         * both encryption and compression status are
         * in location before offset 230 of the buffer.
         */
        if (rbf_size < MIN_BITSTREAM_SIZECHECK)
                return -EINVAL;

        encrypt = (rbf_data[ENCRYPTION_OFFSET] >> 2) & 3;
        encrypt = encrypt != 0;

        compress = (rbf_data[COMPRESSION_OFFSET] >> 1) & 1;
        compress = !compress;

        debug("FPGA: Header word %d = %08x.\n", 69, rbf_data[69]);
        debug("FPGA: Header word %d = %08x.\n", 229, rbf_data[229]);
        debug("FPGA: Read from rbf header: encrypt=%d compress=%d.\n", encrypt,
             compress);

        /*
         * from the register map description of cdratio in imgcfg_ctrl_02:
         *  Normal Configuration    : 32bit Passive Parallel
         *  Partial Reconfiguration : 16bit Passive Parallel
         */

        /*
         * cd ratio is dependent on cfg width and whether the bitstream
         * is encrypted and/or compressed.
         *
         * | width | encr. | compr. | cd ratio |
         * |  16   |   0   |   0    |     1    |
         * |  16   |   0   |   1    |     4    |
         * |  16   |   1   |   0    |     2    |
         * |  16   |   1   |   1    |     4    |
         * |  32   |   0   |   0    |     1    |
         * |  32   |   0   |   1    |     8    |
         * |  32   |   1   |   0    |     4    |
         * |  32   |   1   |   1    |     8    |
         */
        if (!compress && !encrypt) {
                cd_ratio = CDRATIO_x1;
        } else {
                if (compress)
                        cd_ratio = CDRATIO_x4;
                else
                        cd_ratio = CDRATIO_x2;

                /* if 32 bit, double the cd ratio (so register
                   field setting is incremented) */
                if (cfg_width == CFGWDTH_32)
                        cd_ratio += 1;
        }

        fpgamgr_set_cfgwdth(cfg_width);
        fpgamgr_set_cd_ratio(cd_ratio);

        return 0;
}

static int fpgamgr_reset(void)
{
        unsigned long reg;

        /* S2F_NCONFIG = 0 */
        clrbits_le32(&fpga_manager_base->imgcfg_ctrl_00,
                ALT_FPGAMGR_IMGCFG_CTL_00_S2F_NCONFIG_SET_MSK);

        /* Wait for f2s_nstatus == 0 */
        if (wait_for_f2s_nstatus_pin(0))
                return -ETIME;

        /* S2F_NCONFIG = 1 */
        setbits_le32(&fpga_manager_base->imgcfg_ctrl_00,
                ALT_FPGAMGR_IMGCFG_CTL_00_S2F_NCONFIG_SET_MSK);

        /* Wait for f2s_nstatus == 1 */
        if (wait_for_f2s_nstatus_pin(1))
                return -ETIME;

        /* read and confirm f2s_condone_pin = 0 and f2s_condone_oe = 1 */
        reg = readl(&fpga_manager_base->imgcfg_stat);
        if ((reg & ALT_FPGAMGR_IMGCFG_STAT_F2S_CONDONE_PIN_SET_MSK) != 0)
                return -EPERM;

        if ((reg & ALT_FPGAMGR_IMGCFG_STAT_F2S_CONDONE_OE_SET_MSK) == 0)
                return -EPERM;

        return 0;
}

/* Start the FPGA programming by initialize the FPGA Manager */
int fpgamgr_program_init(u32 * rbf_data, size_t rbf_size)
{
        int ret;

        /* Step 1 */
        if (fpgamgr_verify_msel())
                return -EPERM;

        /* Step 2 */
        if (fpgamgr_set_cdratio_cdwidth(CFGWDTH_32, rbf_data, rbf_size))
                return -EPERM;

        /*
         * Step 3:
         * Make sure no other external devices are trying to interfere with
         * programming:
         */
        if (wait_for_nconfig_pin_and_nstatus_pin())
                return -ETIME;

        /*
         * Step 4:
         * Deassert the signal drives from HPS
         *
         * S2F_NCE = 1
         * S2F_PR_REQUEST = 0
         * EN_CFG_CTRL = 0
         * EN_CFG_DATA = 0
         * S2F_NCONFIG = 1
         * S2F_NSTATUS_OE = 0
         * S2F_CONDONE_OE = 0
         */
        setbits_le32(&fpga_manager_base->imgcfg_ctrl_01,
                ALT_FPGAMGR_IMGCFG_CTL_01_S2F_NCE_SET_MSK);

        clrbits_le32(&fpga_manager_base->imgcfg_ctrl_01,
                ALT_FPGAMGR_IMGCFG_CTL_01_S2F_PR_REQUEST_SET_MSK);

        clrbits_le32(&fpga_manager_base->imgcfg_ctrl_02,
                ALT_FPGAMGR_IMGCFG_CTL_02_EN_CFG_DATA_SET_MSK |
                ALT_FPGAMGR_IMGCFG_CTL_02_EN_CFG_CTRL_SET_MSK);

        setbits_le32(&fpga_manager_base->imgcfg_ctrl_00,
                ALT_FPGAMGR_IMGCFG_CTL_00_S2F_NCONFIG_SET_MSK);

        clrbits_le32(&fpga_manager_base->imgcfg_ctrl_00,
                ALT_FPGAMGR_IMGCFG_CTL_00_S2F_NSTATUS_OE_SET_MSK |
                ALT_FPGAMGR_IMGCFG_CTL_00_S2F_CONDONE_OE_SET_MSK);

        /*
         * Step 5:
         * Enable overrides
         * S2F_NENABLE_CONFIG = 0
         * S2F_NENABLE_NCONFIG = 0
         */
        clrbits_le32(&fpga_manager_base->imgcfg_ctrl_01,
                ALT_FPGAMGR_IMGCFG_CTL_01_S2F_NENABLE_CONFIG_SET_MSK);
        clrbits_le32(&fpga_manager_base->imgcfg_ctrl_00,
                ALT_FPGAMGR_IMGCFG_CTL_00_S2F_NENABLE_NCONFIG_SET_MSK);

        /*
         * Disable driving signals that HPS doesn't need to drive.
         * S2F_NENABLE_NSTATUS = 1
         * S2F_NENABLE_CONDONE = 1
         */
        setbits_le32(&fpga_manager_base->imgcfg_ctrl_00,
                ALT_FPGAMGR_IMGCFG_CTL_00_S2F_NENABLE_NSTATUS_SET_MSK |
                ALT_FPGAMGR_IMGCFG_CTL_00_S2F_NENABLE_CONDONE_SET_MSK);

        /*
         * Step 6:
         * Drive chip select S2F_NCE = 0
         */
         clrbits_le32(&fpga_manager_base->imgcfg_ctrl_01,
                ALT_FPGAMGR_IMGCFG_CTL_01_S2F_NCE_SET_MSK);

        /* Step 7 */
        if (wait_for_nconfig_pin_and_nstatus_pin())
                return -ETIME;

        /* Step 8 */
        ret = fpgamgr_reset();

        if (ret)
                return ret;

        /*
         * Step 9:
         * EN_CFG_CTRL and EN_CFG_DATA = 1
         */
        setbits_le32(&fpga_manager_base->imgcfg_ctrl_02,
                ALT_FPGAMGR_IMGCFG_CTL_02_EN_CFG_DATA_SET_MSK |
                ALT_FPGAMGR_IMGCFG_CTL_02_EN_CFG_CTRL_SET_MSK);

        return 0;
}

/* Ensure the FPGA entering config done */
static int fpgamgr_program_poll_cd(void)
{
        unsigned long reg, i;

        for (i = 0; i < FPGA_TIMEOUT_CNT; i++) {
                reg = readl(&fpga_manager_base->imgcfg_stat);
                if (reg & ALT_FPGAMGR_IMGCFG_STAT_F2S_CONDONE_PIN_SET_MSK)
                        return 0;

                if ((reg & ALT_FPGAMGR_IMGCFG_STAT_F2S_NSTATUS_PIN_SET_MSK) == 0) {
                        printf("nstatus == 0 while waiting for condone\n");
                        return -EPERM;
                }
                WATCHDOG_RESET();
        }

        if (i == FPGA_TIMEOUT_CNT)
                return -ETIME;

        return 0;
}

/* Ensure the FPGA entering user mode */
static int fpgamgr_program_poll_usermode(void)
{
        unsigned long reg;
        int ret = 0;

        if (fpgamgr_dclkcnt_set(0xf))
                return -ETIME;

        ret = wait_for_user_mode();
        if (ret < 0) {
                printf("%s: Failed to enter user mode with ", __func__);
                printf("error code %d\n", ret);
                return ret;
        }

        /*
         * Step 14:
         * Stop DATA path and Dclk
         * EN_CFG_CTRL and EN_CFG_DATA = 0
         */
        clrbits_le32(&fpga_manager_base->imgcfg_ctrl_02,
                ALT_FPGAMGR_IMGCFG_CTL_02_EN_CFG_DATA_SET_MSK |
                ALT_FPGAMGR_IMGCFG_CTL_02_EN_CFG_CTRL_SET_MSK);

        /*
         * Step 15:
         * Disable overrides
         * S2F_NENABLE_CONFIG = 1
         * S2F_NENABLE_NCONFIG = 1
         */
        setbits_le32(&fpga_manager_base->imgcfg_ctrl_01,
                ALT_FPGAMGR_IMGCFG_CTL_01_S2F_NENABLE_CONFIG_SET_MSK);
        setbits_le32(&fpga_manager_base->imgcfg_ctrl_00,
                ALT_FPGAMGR_IMGCFG_CTL_00_S2F_NENABLE_NCONFIG_SET_MSK);

        /* Disable chip select S2F_NCE = 1 */
        setbits_le32(&fpga_manager_base->imgcfg_ctrl_01,
                ALT_FPGAMGR_IMGCFG_CTL_01_S2F_NCE_SET_MSK);

        /*
         * Step 16:
         * Final check
         */
        reg = readl(&fpga_manager_base->imgcfg_stat);
        if (((reg & ALT_FPGAMGR_IMGCFG_STAT_F2S_USERMODE_SET_MSK) !=
                ALT_FPGAMGR_IMGCFG_STAT_F2S_USERMODE_SET_MSK) ||
            ((reg & ALT_FPGAMGR_IMGCFG_STAT_F2S_CONDONE_PIN_SET_MSK) !=
                ALT_FPGAMGR_IMGCFG_STAT_F2S_CONDONE_PIN_SET_MSK) ||
            ((reg & ALT_FPGAMGR_IMGCFG_STAT_F2S_NSTATUS_PIN_SET_MSK) !=
                ALT_FPGAMGR_IMGCFG_STAT_F2S_NSTATUS_PIN_SET_MSK))
                return -EPERM;

        return 0;
}

int fpgamgr_program_finish(void)
{
        /* Ensure the FPGA entering config done */
        int status = fpgamgr_program_poll_cd();

        if (status) {
                printf("FPGA: Poll CD failed with error code %d\n", status);
                return -EPERM;
        }

        /* Ensure the FPGA entering user mode */
        status = fpgamgr_program_poll_usermode();
        if (status) {
                printf("FPGA: Poll usermode failed with error code %d\n",
                        status);
                return -EPERM;
        }

        printf("Full Configuration Succeeded.\n");

        return 0;
}

ofnode get_fpga_mgr_ofnode(ofnode from)
{
        return ofnode_by_compatible(from, "altr,socfpga-a10-fpga-mgr");
}

const char *get_fpga_filename(void)
{
        const char *fpga_filename = NULL;

        ofnode fpgamgr_node = get_fpga_mgr_ofnode(ofnode_null());

        if (ofnode_valid(fpgamgr_node))
                fpga_filename = ofnode_read_string(fpgamgr_node,
                                                "altr,bitstream");

        return fpga_filename;
}

static void get_rbf_image_info(struct rbf_info *rbf, u16 *buffer)
{
        /*
         * Magic ID starting at:
         * -> 1st dword[15:0] in periph.rbf
         * -> 2nd dword[15:0] in core.rbf
         * Note: dword == 32 bits
         */
        u32 word_reading_max = 2;
        u32 i;

        for (i = 0; i < word_reading_max; i++) {
                if (*(buffer + i) == FPGA_SOCFPGA_A10_RBF_UNENCRYPTED) {
                        rbf->security = unencrypted;
                } else if (*(buffer + i) == FPGA_SOCFPGA_A10_RBF_ENCRYPTED) {
                        rbf->security = encrypted;
                } else if (*(buffer + i + 1) ==
                                FPGA_SOCFPGA_A10_RBF_UNENCRYPTED) {
                        rbf->security = unencrypted;
                } else if (*(buffer + i + 1) ==
                                FPGA_SOCFPGA_A10_RBF_ENCRYPTED) {
                        rbf->security = encrypted;
                } else {
                        rbf->security = invalid;
                        continue;
                }

                /* PERIPH RBF(buffer + i + 1), CORE RBF(buffer + i + 2) */
                if (*(buffer + i + 1) == FPGA_SOCFPGA_A10_RBF_PERIPH) {
                        rbf->section = periph_section;
                        break;
                } else if (*(buffer + i + 1) == FPGA_SOCFPGA_A10_RBF_CORE) {
                        rbf->section = core_section;
                        break;
                } else if (*(buffer + i + 2) == FPGA_SOCFPGA_A10_RBF_PERIPH) {
                        rbf->section = periph_section;
                        break;
                } else if (*(buffer + i + 2) == FPGA_SOCFPGA_A10_RBF_CORE) {
                        rbf->section = core_section;
                        break;
                }

                rbf->section = unknown;
                break;

                WATCHDOG_RESET();
        }
}

#ifdef CONFIG_FS_LOADER
static int first_loading_rbf_to_buffer(struct udevice *dev,
                                struct fpga_loadfs_info *fpga_loadfs,
                                u32 *buffer, size_t *buffer_bsize,
                                size_t *buffer_bsize_ori)
{
        u32 *buffer_p = (u32 *)*buffer;
        u32 *loadable = buffer_p;
        size_t buffer_size = *buffer_bsize;
        size_t fit_size;
        int ret, i, count, confs_noffset, images_noffset, rbf_offset, rbf_size;
        const char *fpga_node_name = NULL;
        const char *uname = NULL;

        /* Load image header into buffer */
        ret = request_firmware_into_buf(dev,
                                        fpga_loadfs->fpga_fsinfo->filename,
                                        buffer_p, sizeof(struct image_header),
                                        0);
        if (ret < 0) {
                debug("FPGA: Failed to read image header from flash.\n");
                return -ENOENT;
        }

        if (image_get_magic((struct image_header *)buffer_p) != FDT_MAGIC) {
                debug("FPGA: No FDT magic was found.\n");
                return -EBADF;
        }

        fit_size = fdt_totalsize(buffer_p);

        if (fit_size > buffer_size) {
                debug("FPGA: FIT image is larger than available buffer.\n");
                debug("Please use FIT external data or increasing buffer.\n");
                return -ENOMEM;
        }

        /* Load entire FIT into buffer */
        ret = request_firmware_into_buf(dev,
                                        fpga_loadfs->fpga_fsinfo->filename,
                                        buffer_p, fit_size, 0);
        if (ret < 0)
                return ret;

        ret = fit_check_format(buffer_p, IMAGE_SIZE_INVAL);
        if (ret) {
                debug("FPGA: No valid FIT image was found.\n");
                return ret;
        }

        confs_noffset = fdt_path_offset(buffer_p, FIT_CONFS_PATH);
        images_noffset = fdt_path_offset(buffer_p, FIT_IMAGES_PATH);
        if (confs_noffset < 0 || images_noffset < 0) {
                debug("FPGA: No Configurations or images nodes were found.\n");
                return -ENOENT;
        }

        /* Get default configuration unit name from default property */
        confs_noffset = fit_conf_get_node(buffer_p, NULL);
        if (confs_noffset < 0) {
                debug("FPGA: No default configuration was found in config.\n");
                return -ENOENT;
        }

        count = fit_conf_get_prop_node_count(buffer_p, confs_noffset,
                                            FIT_FPGA_PROP);
        if (count < 0) {
                debug("FPGA: Invalid configuration format for FPGA node.\n");
                return count;
        }
        debug("FPGA: FPGA node count: %d\n", count);

        for (i = 0; i < count; i++) {
                images_noffset = fit_conf_get_prop_node_index(buffer_p,
                                                             confs_noffset,
                                                             FIT_FPGA_PROP, i);
                uname = fit_get_name(buffer_p, images_noffset, NULL);
                if (uname) {
                        debug("FPGA: %s\n", uname);

                        if (strstr(uname, "fpga-periph") &&
                                (!is_fpgamgr_early_user_mode() ||
                                is_fpgamgr_user_mode() ||
                                is_periph_program_force())) {
                                fpga_node_name = uname;
                                printf("FPGA: Start to program ");
                                printf("peripheral/full bitstream ...\n");
                                break;
                        } else if (strstr(uname, "fpga-core") &&
                                        (is_fpgamgr_early_user_mode() &&
                                        !is_fpgamgr_user_mode())) {
                                fpga_node_name = uname;
                                printf("FPGA: Start to program core ");
                                printf("bitstream ...\n");
                                break;
                        }
                }
                WATCHDOG_RESET();
        }

        if (!fpga_node_name) {
                debug("FPGA: No suitable bitstream was found, count: %d.\n", i);
                return 1;
        }

        images_noffset = fit_image_get_node(buffer_p, fpga_node_name);
        if (images_noffset < 0) {
                debug("FPGA: No node '%s' was found in FIT.\n",
                     fpga_node_name);
                return -ENOENT;
        }

        if (!fit_image_get_data_position(buffer_p, images_noffset,
                                        &rbf_offset)) {
                debug("FPGA: Data position was found.\n");
        } else if (!fit_image_get_data_offset(buffer_p, images_noffset,
                  &rbf_offset)) {
                /*
                 * For FIT with external data, figure out where
                 * the external images start. This is the base
                 * for the data-offset properties in each image.
                 */
                rbf_offset += ((fdt_totalsize(buffer_p) + 3) & ~3);
                debug("FPGA: Data offset was found.\n");
        } else {
                debug("FPGA: No data position/offset was found.\n");
                return -ENOENT;
        }

        ret = fit_image_get_data_size(buffer_p, images_noffset, &rbf_size);
        if (ret < 0) {
                debug("FPGA: No data size was found (err=%d).\n", ret);
                return -ENOENT;
        }

        if (gd->ram_size < rbf_size) {
                debug("FPGA: Using default OCRAM buffer and size.\n");
        } else {
                ret = fit_image_get_load(buffer_p, images_noffset,
                                        (ulong *)loadable);
                if (ret < 0) {
                        buffer_p = (u32 *)DEFAULT_DDR_LOAD_ADDRESS;
                        debug("FPGA: No loadable was found.\n");
                        debug("FPGA: Using default DDR load address: 0x%x .\n",
                             DEFAULT_DDR_LOAD_ADDRESS);
                } else {
                        buffer_p = (u32 *)*loadable;
                        debug("FPGA: Found loadable address = 0x%x.\n",
                             *loadable);
                }

                buffer_size = rbf_size;
                *buffer_bsize_ori = DDR_BUFFER_SIZE;
        }

        debug("FPGA: External data: offset = 0x%x, size = 0x%x.\n",
              rbf_offset, rbf_size);

        fpga_loadfs->remaining = rbf_size;

        /*
         * Determine buffer size vs bitstream size, and calculating number of
         * chunk by chunk transfer is required due to smaller buffer size
         * compare to bitstream
         */

        if (buffer_size > MAX_FIRST_LOAD_SIZE)
                buffer_size = MAX_FIRST_LOAD_SIZE;

        if (rbf_size <= buffer_size) {
                /* Loading whole bitstream into buffer */
                buffer_size = rbf_size;
                fpga_loadfs->remaining = 0;
        } else {
                buffer_size -= rbf_offset % buffer_size;
                fpga_loadfs->remaining -= buffer_size;
        }

        fpga_loadfs->offset = rbf_offset;
        /* Loading bitstream into buffer */
        ret = request_firmware_into_buf(dev,
                                        fpga_loadfs->fpga_fsinfo->filename,
                                        buffer_p, buffer_size,
                                        fpga_loadfs->offset);
        if (ret < 0) {
                debug("FPGA: Failed to read bitstream from flash.\n");
                return -ENOENT;
        }

        /* Getting info about bitstream types */
        get_rbf_image_info(&fpga_loadfs->rbfinfo, (u16 *)buffer_p);

        /* Update next reading bitstream offset */
        fpga_loadfs->offset += buffer_size;

        /* Update the final addr for bitstream */
        *buffer = (u32)buffer_p;

        /* Update the size of bitstream to be programmed into FPGA */
        *buffer_bsize = buffer_size;

        return 0;
}

static int subsequent_loading_rbf_to_buffer(struct udevice *dev,
                                        struct fpga_loadfs_info *fpga_loadfs,
                                        u32 *buffer, size_t *buffer_bsize)
{
        int ret = 0;
        u32 *buffer_p = (u32 *)*buffer;

        /* Read the bitstream chunk by chunk. */
        if (fpga_loadfs->remaining > *buffer_bsize) {
                fpga_loadfs->remaining -= *buffer_bsize;
        } else {
                *buffer_bsize = fpga_loadfs->remaining;
                fpga_loadfs->remaining = 0;
        }

        ret = request_firmware_into_buf(dev,
                                        fpga_loadfs->fpga_fsinfo->filename,
                                        buffer_p, *buffer_bsize,
                                        fpga_loadfs->offset);
        if (ret < 0) {
                debug("FPGA: Failed to read bitstream from flash.\n");
                return -ENOENT;
        }

        /* Update next reading bitstream offset */
        fpga_loadfs->offset += *buffer_bsize;

        return 0;
}

int socfpga_loadfs(fpga_fs_info *fpga_fsinfo, const void *buf, size_t bsize,
                        u32 offset)
{
        struct fpga_loadfs_info fpga_loadfs;
        struct udevice *dev;
        int status, ret, size;
        u32 buffer = (uintptr_t)buf;
        size_t buffer_sizebytes = bsize;
        size_t buffer_sizebytes_ori = bsize;
        size_t total_sizeof_image = 0;
        ofnode node;
        const fdt32_t *phandle_p;
        u32 phandle;

        node = get_fpga_mgr_ofnode(ofnode_null());

        if (ofnode_valid(node)) {
                phandle_p = ofnode_get_property(node, "firmware-loader", &size);
                if (!phandle_p) {
                        node = ofnode_path("/chosen");
                        if (!ofnode_valid(node)) {
                                debug("FPGA: /chosen node was not found.\n");
                                return -ENOENT;
                        }

                        phandle_p = ofnode_get_property(node, "firmware-loader",
                                                       &size);
                        if (!phandle_p) {
                                debug("FPGA: firmware-loader property was not");
                                debug(" found.\n");
                                return -ENOENT;
                        }
                }
        } else {
                debug("FPGA: FPGA manager node was not found.\n");
                return -ENOENT;
        }

        phandle = fdt32_to_cpu(*phandle_p);
        ret = uclass_get_device_by_phandle_id(UCLASS_FS_FIRMWARE_LOADER,
                                             phandle, &dev);
        if (ret)
                return ret;

        memset(&fpga_loadfs, 0, sizeof(fpga_loadfs));

        fpga_loadfs.fpga_fsinfo = fpga_fsinfo;
        fpga_loadfs.offset = offset;

        printf("FPGA: Checking FPGA configuration setting ...\n");

        /*
         * Note: Both buffer and buffer_sizebytes values can be altered by
         * function below.
         */
        ret = first_loading_rbf_to_buffer(dev, &fpga_loadfs, &buffer,
                                           &buffer_sizebytes,
                                           &buffer_sizebytes_ori);
        if (ret == 1) {
                printf("FPGA: Skipping configuration ...\n");
                return 0;
        } else if (ret) {
                return ret;
        }

        if (fpga_loadfs.rbfinfo.section == core_section &&
                !(is_fpgamgr_early_user_mode() && !is_fpgamgr_user_mode())) {
                debug("FPGA : Must be in Early Release mode to program ");
                debug("core bitstream.\n");
                return -EPERM;
        }

        /* Disable all signals from HPS peripheral controller to FPGA */
        writel(0, socfpga_get_sysmgr_addr() + SYSMGR_A10_FPGAINTF_EN_GLOBAL);

        /* Disable all axi bridges (hps2fpga, lwhps2fpga & fpga2hps) */
        socfpga_bridges_reset();

        if (fpga_loadfs.rbfinfo.section == periph_section) {
                /* Initialize the FPGA Manager */
                status = fpgamgr_program_init((u32 *)buffer, buffer_sizebytes);
                if (status) {
                        debug("FPGA: Init with peripheral bitstream failed.\n");
                        return -EPERM;
                }
        }

        /* Transfer bitstream to FPGA Manager */
        fpgamgr_program_write((void *)buffer, buffer_sizebytes);

        total_sizeof_image += buffer_sizebytes;

        while (fpga_loadfs.remaining) {
                ret = subsequent_loading_rbf_to_buffer(dev,
                                                        &fpga_loadfs,
                                                        &buffer,
                                                        &buffer_sizebytes_ori);

                if (ret)
                        return ret;

                /* Transfer data to FPGA Manager */
                fpgamgr_program_write((void *)buffer,
                                        buffer_sizebytes_ori);

                total_sizeof_image += buffer_sizebytes_ori;

                WATCHDOG_RESET();
        }
        wait_for_fifo_empty();

        if (fpga_loadfs.rbfinfo.section == periph_section) {
                if (fpgamgr_wait_early_user_mode() != -ETIMEDOUT) {
                        config_pins(gd->fdt_blob, "shared");
                        puts("FPGA: Early Release Succeeded.\n");
                } else {
                        debug("FPGA: Failed to see Early Release.\n");
                        return -EIO;
                }

                /* For monolithic bitstream */
                if (is_fpgamgr_user_mode()) {
                        /* Ensure the FPGA entering config done */
                        status = fpgamgr_program_finish();
                        if (status)
                                return status;

                        config_pins(gd->fdt_blob, "fpga");
                        puts("FPGA: Enter user mode.\n");
                }
        } else if (fpga_loadfs.rbfinfo.section == core_section) {
                /* Ensure the FPGA entering config done */
                status = fpgamgr_program_finish();
                if (status)
                        return status;

                config_pins(gd->fdt_blob, "fpga");
                puts("FPGA: Enter user mode.\n");
        } else {
                debug("FPGA: Config Error: Unsupported bitstream type.\n");
                return -ENOEXEC;
        }

        return (int)total_sizeof_image;
}

void fpgamgr_program(const void *buf, size_t bsize, u32 offset)
{
        fpga_fs_info fpga_fsinfo;

        fpga_fsinfo.filename = get_fpga_filename();

        if (fpga_fsinfo.filename)
                socfpga_loadfs(&fpga_fsinfo, buf, bsize, offset);
}
#endif

/* This function is used to load the core bitstream from the OCRAM. */
int socfpga_load(Altera_desc *desc, const void *rbf_data, size_t rbf_size)
{
        unsigned long status;
        struct rbf_info rbfinfo;

        memset(&rbfinfo, 0, sizeof(rbfinfo));

        /* Disable all signals from hps peripheral controller to fpga */
        writel(0, socfpga_get_sysmgr_addr() + SYSMGR_A10_FPGAINTF_EN_GLOBAL);

        /* Disable all axi bridge (hps2fpga, lwhps2fpga & fpga2hps) */
        socfpga_bridges_reset();

        /* Getting info about bitstream types */
        get_rbf_image_info(&rbfinfo, (u16 *)rbf_data);

        if (rbfinfo.section == periph_section) {
                /* Initialize the FPGA Manager */
                status = fpgamgr_program_init((u32 *)rbf_data, rbf_size);
                if (status)
                        return status;
        }

        if (rbfinfo.section == core_section &&
                !(is_fpgamgr_early_user_mode() && !is_fpgamgr_user_mode())) {
                debug("FPGA : Must be in early release mode to program ");
                debug("core bitstream.\n");
                return -EPERM;
        }

        /* Write the bitstream to FPGA Manager */
        fpgamgr_program_write(rbf_data, rbf_size);

        status = fpgamgr_program_finish();
        if (status)
                return status;

        config_pins(gd->fdt_blob, "fpga");
        puts("FPGA: Enter user mode.\n");

        return status;
}