// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright 2007 David Gibson, IBM Corporation.
 *
 * Based on earlier code:
 *   Copyright (C) Paul Mackerras 1997.
 *
 *   Matt Porter <mporter@kernel.crashing.org>
 *   Copyright 2002-2005 MontaVista Software Inc.
 *
 *   Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
 *   Copyright (c) 2003, 2004 Zultys Technologies
 */
#include <stdarg.h>
#include <stddef.h>
#include "types.h"
#include "elf.h"
#include "string.h"
#include "stdio.h"
#include "page.h"
#include "ops.h"
#include "reg.h"
#include "io.h"
#include "dcr.h"
#include "4xx.h"
#include "44x.h"

static u8 *ebony_mac0, *ebony_mac1;

#define EBONY_FPGA_PATH         "/plb/opb/ebc/fpga"
#define EBONY_FPGA_FLASH_SEL    0x01
#define EBONY_SMALL_FLASH_PATH  "/plb/opb/ebc/small-flash"

static void ebony_flashsel_fixup(void)
{
        void *devp;
        u32 reg[3] = {0x0, 0x0, 0x80000};
        u8 *fpga;
        u8 fpga_reg0 = 0x0;

        devp = finddevice(EBONY_FPGA_PATH);
        if (!devp)
                fatal("Couldn't locate FPGA node %s\n\r", EBONY_FPGA_PATH);

        if (getprop(devp, "virtual-reg", &fpga, sizeof(fpga)) != sizeof(fpga))
                fatal("%s has missing or invalid virtual-reg property\n\r",
                      EBONY_FPGA_PATH);

        fpga_reg0 = in_8(fpga);

        devp = finddevice(EBONY_SMALL_FLASH_PATH);
        if (!devp)
                fatal("Couldn't locate small flash node %s\n\r",
                      EBONY_SMALL_FLASH_PATH);

        if (getprop(devp, "reg", reg, sizeof(reg)) != sizeof(reg))
                fatal("%s has reg property of unexpected size\n\r",
                      EBONY_SMALL_FLASH_PATH);

        /* Invert address bit 14 (IBM-endian) if FLASH_SEL fpga bit is set */
        if (fpga_reg0 & EBONY_FPGA_FLASH_SEL)
                reg[1] ^= 0x80000;

        setprop(devp, "reg", reg, sizeof(reg));
}

static void ebony_fixups(void)
{
        // FIXME: sysclk should be derived by reading the FPGA registers
        unsigned long sysclk = 33000000;

        ibm440gp_fixup_clocks(sysclk, 6 * 1843200);
        ibm4xx_sdram_fixup_memsize();
        dt_fixup_mac_address_by_alias("ethernet0", ebony_mac0);
        dt_fixup_mac_address_by_alias("ethernet1", ebony_mac1);
        ibm4xx_fixup_ebc_ranges("/plb/opb/ebc");
        ebony_flashsel_fixup();
}

void ebony_init(void *mac0, void *mac1)
{
        platform_ops.fixups = ebony_fixups;
        platform_ops.exit = ibm44x_dbcr_reset;
        ebony_mac0 = mac0;
        ebony_mac1 = mac1;
        fdt_init(_dtb_start);
        serial_console_init();
}