LXR linux/arch/powerpc/boot/ebony.c

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * Copyright 2007 David Gibson, IBM Corporation.
   4 *
   5 * Based on earlier code:
   6 *   Copyright (C) Paul Mackerras 1997.
   7 *
   8 *   Matt Porter <mporter@kernel.crashing.org>
   9 *   Copyright 2002-2005 MontaVista Software Inc.
  10 *
  11 *   Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
  12 *   Copyright (c) 2003, 2004 Zultys Technologies
  13 */
  14#include <stdarg.h>
  15#include <stddef.h>
  16#include "types.h"
  17#include "elf.h"
  18#include "string.h"
  19#include "stdio.h"
  20#include "page.h"
  21#include "ops.h"
  22#include "reg.h"
  23#include "io.h"
  24#include "dcr.h"
  25#include "4xx.h"
  26#include "44x.h"
  27
  28static u8 *ebony_mac0, *ebony_mac1;
  29
  30#define EBONY_FPGA_PATH         "/plb/opb/ebc/fpga"
  31#define EBONY_FPGA_FLASH_SEL    0x01
  32#define EBONY_SMALL_FLASH_PATH  "/plb/opb/ebc/small-flash"
  33
  34static void ebony_flashsel_fixup(void)
  35{
  36        void *devp;
  37        u32 reg[3] = {0x0, 0x0, 0x80000};
  38        u8 *fpga;
  39        u8 fpga_reg0 = 0x0;
  40
  41        devp = finddevice(EBONY_FPGA_PATH);
  42        if (!devp)
  43                fatal("Couldn't locate FPGA node %s\n\r", EBONY_FPGA_PATH);
  44
  45        if (getprop(devp, "virtual-reg", &fpga, sizeof(fpga)) != sizeof(fpga))
  46                fatal("%s has missing or invalid virtual-reg property\n\r",
  47                      EBONY_FPGA_PATH);
  48
  49        fpga_reg0 = in_8(fpga);
  50
  51        devp = finddevice(EBONY_SMALL_FLASH_PATH);
  52        if (!devp)
  53                fatal("Couldn't locate small flash node %s\n\r",
  54                      EBONY_SMALL_FLASH_PATH);
  55
  56        if (getprop(devp, "reg", reg, sizeof(reg)) != sizeof(reg))
  57                fatal("%s has reg property of unexpected size\n\r",
  58                      EBONY_SMALL_FLASH_PATH);
  59
  60        /* Invert address bit 14 (IBM-endian) if FLASH_SEL fpga bit is set */
  61        if (fpga_reg0 & EBONY_FPGA_FLASH_SEL)
  62                reg[1] ^= 0x80000;
  63
  64        setprop(devp, "reg", reg, sizeof(reg));
  65}
  66
  67static void ebony_fixups(void)
  68{
  69        // FIXME: sysclk should be derived by reading the FPGA registers
  70        unsigned long sysclk = 33000000;
  71
  72        ibm440gp_fixup_clocks(sysclk, 6 * 1843200);
  73        ibm4xx_sdram_fixup_memsize();
  74        dt_fixup_mac_address_by_alias("ethernet0", ebony_mac0);
  75        dt_fixup_mac_address_by_alias("ethernet1", ebony_mac1);
  76        ibm4xx_fixup_ebc_ranges("/plb/opb/ebc");
  77        ebony_flashsel_fixup();
  78}
  79
  80void ebony_init(void *mac0, void *mac1)
  81{
  82        platform_ops.fixups = ebony_fixups;
  83        platform_ops.exit = ibm44x_dbcr_reset;
  84        ebony_mac0 = mac0;
  85        ebony_mac1 = mac1;
  86        fdt_init(_dtb_start);
  87        serial_console_init();
  88}
  89