// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright © 2011 Tony Breeds 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
 *
 *    Copyright 2007 David Gibson, IBM Corporation.
 *    Copyright 2010 Ben. Herrenschmidt, IBM Corporation.
 *    Copyright © 2011 David Kleikamp IBM Corporation
 */
#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"
#include "libfdt.h"

BSS_STACK(4096);

#define MAX_RANKS       0x4
#define DDR3_MR0CF      0x80010011U

static unsigned long long ibm_currituck_memsize;
static unsigned long long ibm_currituck_detect_memsize(void)
{
        u32 reg;
        unsigned i;
        unsigned long long memsize = 0;

        for(i = 0; i < MAX_RANKS; i++){
                reg = mfdcrx(DDR3_MR0CF + i);

                if (!(reg & 1))
                        continue;

                reg &= 0x0000f000;
                reg >>= 12;
                memsize += (0x800000ULL << reg);
        }

        return memsize;
}

static void ibm_currituck_fixups(void)
{
        void *devp = finddevice("/");
        u32 dma_ranges[7];

        dt_fixup_memory(0x0ULL,  ibm_currituck_memsize);

        while ((devp = find_node_by_devtype(devp, "pci"))) {
                if (getprop(devp, "dma-ranges", dma_ranges, sizeof(dma_ranges)) < 0) {
                        printf("%s: Failed to get dma-ranges\r\n", __func__);
                        continue;
                }

                dma_ranges[5] = ibm_currituck_memsize >> 32;
                dma_ranges[6] = ibm_currituck_memsize & 0xffffffffUL;

                setprop(devp, "dma-ranges", dma_ranges, sizeof(dma_ranges));
        }
}

#define SPRN_PIR        0x11E   /* Processor Identification Register */
void platform_init(void)
{
        unsigned long end_of_ram, avail_ram;
        u32 pir_reg;
        int node, size;
        const u32 *timebase;

        ibm_currituck_memsize = ibm_currituck_detect_memsize();
        if (ibm_currituck_memsize >> 32)
                end_of_ram = ~0UL;
        else
                end_of_ram = ibm_currituck_memsize;
        avail_ram = end_of_ram - (unsigned long)_end;

        simple_alloc_init(_end, avail_ram, 128, 64);
        platform_ops.fixups = ibm_currituck_fixups;
        platform_ops.exit = ibm44x_dbcr_reset;
        pir_reg = mfspr(SPRN_PIR);

        /* Make sure FDT blob is sane */
        if (fdt_check_header(_dtb_start) != 0)
                fatal("Invalid device tree blob\n");

        node = fdt_node_offset_by_prop_value(_dtb_start, -1, "device_type",
                                             "cpu", sizeof("cpu"));
        if (!node)
                fatal("Cannot find cpu node\n");
        timebase = fdt_getprop(_dtb_start, node, "timebase-frequency", &size);
        if (timebase && (size == 4))
                timebase_period_ns = 1000000000 / *timebase;

        fdt_set_boot_cpuid_phys(_dtb_start, pir_reg);
        fdt_init(_dtb_start);

        serial_console_init();
}