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
  32 static 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
  38 static 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
  71 static 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_addresses(ebony_mac0, ebony_mac1);
  79         ibm4xx_fixup_ebc_ranges("/plb/opb/ebc");
  80         ebony_flashsel_fixup();
  81 }
  82
  83 void ebony_init(void *mac0, void *mac1)
  84 {
  85         platform_ops.fixups = ebony_fixups;
  86         platform_ops.exit = ibm44x_dbcr_reset;
  87         ebony_mac0 = mac0;
  88         ebony_mac1 = mac1;
  89         fdt_init(_dtb_start);
  90         serial_console_init();
  91 }