/*
 * (C) Copyright 2006
 * Heiko Schocher, hs@denx.de
 * Based on ACE1XK.c
 *
 * SPDX-License-Identifier:     GPL-2.0+
 */

#include <common.h>             /* core U-Boot definitions */
#include <altera.h>
#include <ACEX1K.h>             /* ACEX device family */

/* Define FPGA_DEBUG to get debug printf's */
#ifdef  FPGA_DEBUG
#define PRINTF(fmt,args...)     printf (fmt ,##args)
#else
#define PRINTF(fmt,args...)
#endif

/* Note: The assumption is that we cannot possibly run fast enough to
 * overrun the device (the Slave Parallel mode can free run at 50MHz).
 * If there is a need to operate slower, define CONFIG_FPGA_DELAY in
 * the board config file to slow things down.
 */
#ifndef CONFIG_FPGA_DELAY
#define CONFIG_FPGA_DELAY()
#endif

#ifndef CONFIG_SYS_FPGA_WAIT
#define CONFIG_SYS_FPGA_WAIT CONFIG_SYS_HZ/10           /* 100 ms */
#endif

static int CYC2_ps_load(Altera_desc *desc, const void *buf, size_t bsize);
static int CYC2_ps_dump(Altera_desc *desc, const void *buf, size_t bsize);
/* static int CYC2_ps_info( Altera_desc *desc ); */

/* ------------------------------------------------------------------------- */
/* CYCLON2 Generic Implementation */
int CYC2_load(Altera_desc *desc, const void *buf, size_t bsize)
{
        int ret_val = FPGA_FAIL;

        switch (desc->iface) {
        case passive_serial:
                PRINTF ("%s: Launching Passive Serial Loader\n", __FUNCTION__);
                ret_val = CYC2_ps_load (desc, buf, bsize);
                break;

        case fast_passive_parallel:
                /* Fast Passive Parallel (FPP) and PS only differ in what is
                 * done in the write() callback. Use the existing PS load
                 * function for FPP, too.
                 */
                PRINTF ("%s: Launching Fast Passive Parallel Loader\n",
                      __FUNCTION__);
                ret_val = CYC2_ps_load(desc, buf, bsize);
                break;

                /* Add new interface types here */

        default:
                printf ("%s: Unsupported interface type, %d\n",
                                __FUNCTION__, desc->iface);
        }

        return ret_val;
}

int CYC2_dump(Altera_desc *desc, const void *buf, size_t bsize)
{
        int ret_val = FPGA_FAIL;

        switch (desc->iface) {
        case passive_serial:
                PRINTF ("%s: Launching Passive Serial Dump\n", __FUNCTION__);
                ret_val = CYC2_ps_dump (desc, buf, bsize);
                break;

                /* Add new interface types here */

        default:
                printf ("%s: Unsupported interface type, %d\n",
                                __FUNCTION__, desc->iface);
        }

        return ret_val;
}

int CYC2_info( Altera_desc *desc )
{
        return FPGA_SUCCESS;
}

/* ------------------------------------------------------------------------- */
/* CYCLON2 Passive Serial Generic Implementation                                  */
static int CYC2_ps_load(Altera_desc *desc, const void *buf, size_t bsize)
{
        int ret_val = FPGA_FAIL;        /* assume the worst */
        Altera_CYC2_Passive_Serial_fns *fn = desc->iface_fns;
        int     ret = 0;

        PRINTF ("%s: start with interface functions @ 0x%p\n",
                        __FUNCTION__, fn);

        if (fn) {
                int cookie = desc->cookie;      /* make a local copy */
                unsigned long ts;               /* timestamp */

                PRINTF ("%s: Function Table:\n"
                                "ptr:\t0x%p\n"
                                "struct: 0x%p\n"
                                "config:\t0x%p\n"
                                "status:\t0x%p\n"
                                "write:\t0x%p\n"
                                "done:\t0x%p\n\n",
                                __FUNCTION__, &fn, fn, fn->config, fn->status,
                                fn->write, fn->done);
#ifdef CONFIG_SYS_FPGA_PROG_FEEDBACK
                printf ("Loading FPGA Device %d...", cookie);
#endif

                /*
                 * Run the pre configuration function if there is one.
                 */
                if (*fn->pre) {
                        (*fn->pre) (cookie);
                }

                /* Establish the initial state */
                (*fn->config) (false, true, cookie);    /* De-assert nCONFIG */
                udelay(100);
                (*fn->config) (true, true, cookie);     /* Assert nCONFIG */

                udelay(2);              /* T_cfg > 2us  */

                /* Wait for nSTATUS to be asserted */
                ts = get_timer (0);             /* get current time */
                do {
                        CONFIG_FPGA_DELAY ();
                        if (get_timer (ts) > CONFIG_SYS_FPGA_WAIT) {    /* check the time */
                                puts ("** Timeout waiting for STATUS to go high.\n");
                                (*fn->abort) (cookie);
                                return FPGA_FAIL;
                        }
                } while (!(*fn->status) (cookie));

                /* Get ready for the burn */
                CONFIG_FPGA_DELAY ();

                ret = (*fn->write) (buf, bsize, true, cookie);
                if (ret) {
                        puts ("** Write failed.\n");
                        (*fn->abort) (cookie);
                        return FPGA_FAIL;
                }
#ifdef CONFIG_SYS_FPGA_PROG_FEEDBACK
                puts(" OK? ...");
#endif

                CONFIG_FPGA_DELAY ();

#ifdef CONFIG_SYS_FPGA_PROG_FEEDBACK
                putc (' ');                     /* terminate the dotted line */
#endif

        /*
         * Checking FPGA's CONF_DONE signal - correctly booted ?
         */

        if ( ! (*fn->done) (cookie) ) {
                puts ("** Booting failed! CONF_DONE is still deasserted.\n");
                (*fn->abort) (cookie);
                return (FPGA_FAIL);
        }
#ifdef CONFIG_SYS_FPGA_PROG_FEEDBACK
        puts(" OK\n");
#endif

        ret_val = FPGA_SUCCESS;

#ifdef CONFIG_SYS_FPGA_PROG_FEEDBACK
        if (ret_val == FPGA_SUCCESS) {
                puts ("Done.\n");
        }
        else {
                puts ("Fail.\n");
        }
#endif
        (*fn->post) (cookie);

        } else {
                printf ("%s: NULL Interface function table!\n", __FUNCTION__);
        }

        return ret_val;
}

static int CYC2_ps_dump(Altera_desc *desc, const void *buf, size_t bsize)
{
        /* Readback is only available through the Slave Parallel and         */
        /* boundary-scan interfaces.                                         */
        printf ("%s: Passive Serial Dumping is unavailable\n",
                        __FUNCTION__);
        return FPGA_FAIL;
}