// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright © 2013 Tony Breeds IBM Corporation
 * Copyright © 2013 Alistair Popple 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 "stdlib.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 SPRN_PIR        0x11E   /* Processor Identification Register */
#define USERDATA_LEN    256     /* Length of userdata passed in by PIBS */
#define MAX_RANKS       0x4
#define DDR3_MR0CF      0x80010011U
#define CCTL0_MCO2      0x8000080FU
#define CCTL0_MCO3      0x80000810U
#define CCTL0_MCO4      0x80000811U
#define CCTL0_MCO5      0x80000812U
#define CCTL0_MCO6      0x80000813U

static unsigned long long ibm_akebono_memsize;
static long long unsigned mac_addr;

static unsigned long long ibm_akebono_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_akebono_fixups(void)
{
        void *emac;
        u32 reg;

        dt_fixup_memory(0x0ULL,  ibm_akebono_memsize);

        /* Fixup the SD timeout frequency */
        mtdcrx(CCTL0_MCO4, 0x1);

        /* Disable SD high-speed mode (which seems to be broken) */
        reg = mfdcrx(CCTL0_MCO2) & ~0x2;
        mtdcrx(CCTL0_MCO2, reg);

        /* Set the MAC address */
        emac = finddevice("/plb/opb/ethernet");
        if (emac > 0) {
                if (mac_addr)
                        setprop(emac, "local-mac-address",
                                ((u8 *) &mac_addr) + 2 , 6);
        }
}

void platform_init(char *userdata)
{
        unsigned long end_of_ram, avail_ram;
        u32 pir_reg;
        int node, size;
        const u32 *timebase;
        int len, i, userdata_len;
        char *end;

        userdata[USERDATA_LEN - 1] = '\0';
        userdata_len = strlen(userdata);
        for (i = 0; i < userdata_len - 15; i++) {
                if (strncmp(&userdata[i], "local-mac-addr=", 15) == 0) {
                        if (i > 0 && userdata[i - 1] != ' ') {
                                /* We've only found a substring ending
                                 * with local-mac-addr so this isn't
                                 * our mac address. */
                                continue;
                        }

                        mac_addr = strtoull(&userdata[i + 15], &end, 16);

                        /* Remove the "local-mac-addr=<...>" from the kernel
                         * command line, including the tailing space if
                         * present. */
                        if (*end == ' ')
                                end++;

                        len = ((int) end) - ((int) &userdata[i]);
                        memmove(&userdata[i], end,
                                userdata_len - (len + i) + 1);
                        break;
                }
        }

        loader_info.cmdline = userdata;
        loader_info.cmdline_len = 256;

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

        simple_alloc_init(_end, avail_ram, 128, 64);
        platform_ops.fixups = ibm_akebono_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();
}