arch/powerpc/boot/treeboot-iss4xx.c

   1 /*
   2  * Copyright 2010 Ben. Herrenschmidt, 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  *    Copyright 2007 David Gibson, IBM Corporation.
  14  *
  15  * This program is free software; you can redistribute it and/or
  16  * modify it under the terms of the GNU General Public License
  17  * as published by the Free Software Foundation; either version
  18  * 2 of the License, or (at your option) any later version.
  19  */
  20 #include <stdarg.h>
  21 #include <stddef.h>
  22 #include "types.h"
  23 #include "elf.h"
  24 #include "string.h"
  25 #include "stdio.h"
  26 #include "page.h"
  27 #include "ops.h"
  28 #include "reg.h"
  29 #include "io.h"
  30 #include "dcr.h"
  31 #include "4xx.h"
  32 #include "44x.h"
  33 #include "libfdt.h"
  34
  35 BSS_STACK(4096);
  36
  37 static u32 ibm4xx_memstart;
  38
  39 static void iss_4xx_fixups(void)
  40 {
  41         void *memory;
  42         u32 reg[3];
  43
  44         memory = finddevice("/memory");
  45         if (!memory)
  46                 fatal("Can't find memory node\n");
  47         /* This assumes #address-cells = 2, #size-cells =1 and that */
  48         getprop(memory, "reg", reg, sizeof(reg));
  49         if (reg[2])
  50                 /* If the device tree specifies the memory range, use it */
  51                 ibm4xx_memstart = reg[1];
  52         else
  53                 /* othersize, read it from the SDRAM controller */
  54                 ibm4xx_sdram_fixup_memsize();
  55 }
  56
  57 static void *iss_4xx_vmlinux_alloc(unsigned long size)
  58 {
  59         return (void *)ibm4xx_memstart;
  60 }
  61
  62 #define SPRN_PIR        0x11E   /* Processor Identification Register */
  63 void platform_init(void)
  64 {
  65         unsigned long end_of_ram = 0x08000000;
  66         unsigned long avail_ram = end_of_ram - (unsigned long)_end;
  67         u32 pir_reg;
  68
  69         simple_alloc_init(_end, avail_ram, 128, 64);
  70         platform_ops.fixups = iss_4xx_fixups;
  71         platform_ops.vmlinux_alloc = iss_4xx_vmlinux_alloc;
  72         platform_ops.exit = ibm44x_dbcr_reset;
  73         pir_reg = mfspr(SPRN_PIR);
  74         fdt_set_boot_cpuid_phys(_dtb_start, pir_reg);
  75         fdt_init(_dtb_start);
  76         serial_console_init();
  77 }