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

   1/*
   2 * Copyright 2007 David Gibson, IBM Corporation.
   3 *
   4 * Based on earlier code:
   5 *   Copyright (C) Paul Mackerras 1997.
   6 *
   7 *   Matt Porter <mporter@kernel.crashing.org>
   8 *   Copyright 2002-2005 MontaVista Software Inc.
   9 *
  10 *   Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
  11 *   Copyright (c) 2003, 2004 Zultys Technologies
  12 *
  13 * This program is free software; you can redistribute it and/or
  14 * modify it under the terms of the GNU General Public License
  15 * as published by the Free Software Foundation; either version
  16 * 2 of the License, or (at your option) any later version.
  17 */
  18#include <stdarg.h>
  19#include <stddef.h>
  20#include "types.h"
  21#include "elf.h"
  22#include "string.h"
  23#include "stdio.h"
  24#include "page.h"
  25#include "ops.h"
  26#include "reg.h"
  27#include "io.h"
  28#include "dcr.h"
  29#include "4xx.h"
  30#include "44x.h"
  31
  32static u8 *ebony_mac0, *ebony_mac1;
  33
  34#define EBONY_FPGA_PATH         "/plb/opb/ebc/fpga"
  35#define EBONY_FPGA_FLASH_SEL    0x01
  36#define EBONY_SMALL_FLASH_PATH  "/plb/opb/ebc/small-flash"
  37
  38static void ebony_flashsel_fixup(void)
  39{
  40        void *devp;
  41        u32 reg[3] = {0x0, 0x0, 0x80000};
  42        u8 *fpga;
  43        u8 fpga_reg0 = 0x0;
  44
  45        devp = finddevice(EBONY_FPGA_PATH);
  46        if (!devp)
  47                fatal("Couldn't locate FPGA node %s\n\r", EBONY_FPGA_PATH);
  48
  49        if (getprop(devp, "virtual-reg", &fpga, sizeof(fpga)) != sizeof(fpga))
  50                fatal("%s has missing or invalid virtual-reg property\n\r",
  51                      EBONY_FPGA_PATH);
  52
  53        fpga_reg0 = in_8(fpga);
  54
  55        devp = finddevice(EBONY_SMALL_FLASH_PATH);
  56        if (!devp)
  57                fatal("Couldn't locate small flash node %s\n\r",
  58                      EBONY_SMALL_FLASH_PATH);
  59
  60        if (getprop(devp, "reg", reg, sizeof(reg)) != sizeof(reg))
  61                fatal("%s has reg property of unexpected size\n\r",
  62                      EBONY_SMALL_FLASH_PATH);
  63
  64        /* Invert address bit 14 (IBM-endian) if FLASH_SEL fpga bit is set */
  65        if (fpga_reg0 & EBONY_FPGA_FLASH_SEL)
  66                reg[1] ^= 0x80000;
  67
  68        setprop(devp, "reg", reg, sizeof(reg));
  69}
  70
  71static void ebony_fixups(void)
  72{
  73        // FIXME: sysclk should be derived by reading the FPGA registers
  74        unsigned long sysclk = 33000000;
  75
  76        ibm440gp_fixup_clocks(sysclk, 6 * 1843200);
  77        ibm4xx_sdram_fixup_memsize();
  78        dt_fixup_mac_address_by_alias("ethernet0", ebony_mac0);
  79        dt_fixup_mac_address_by_alias("ethernet1", ebony_mac1);
  80        ibm4xx_fixup_ebc_ranges("/plb/opb/ebc");
  81        ebony_flashsel_fixup();
  82}
  83
  84void ebony_init(void *mac0, void *mac1)
  85{
  86        platform_ops.fixups = ebony_fixups;
  87        platform_ops.exit = ibm44x_dbcr_reset;
  88        ebony_mac0 = mac0;
  89        ebony_mac1 = mac1;
  90        fdt_init(_dtb_start);
  91        serial_console_init();
  92}
  93