arch/powerpc/boot/treeboot-iss4xx.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright 2010 Ben. Herrenschmidt, 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  *    Copyright 2007 David Gibson, IBM Corporation.
  15  */
  16 #include <stdarg.h>
  17 #include <stddef.h>
  18 #include "types.h"
  19 #include "elf.h"
  20 #include "string.h"
  21 #include "stdio.h"
  22 #include "page.h"
  23 #include "ops.h"
  24 #include "reg.h"
  25 #include "io.h"
  26 #include "dcr.h"
  27 #include "4xx.h"
  28 #include "44x.h"
  29 #include "libfdt.h"
  30
  31 BSS_STACK(4096);
  32
  33 static u32 ibm4xx_memstart;
  34
  35 static void iss_4xx_fixups(void)
  36 {
  37         void *memory;
  38         u32 reg[3];
  39
  40         memory = finddevice("/memory");
  41         if (!memory)
  42                 fatal("Can't find memory node\n");
  43         /* This assumes #address-cells = 2, #size-cells =1 and that */
  44         getprop(memory, "reg", reg, sizeof(reg));
  45         if (reg[2])
  46                 /* If the device tree specifies the memory range, use it */
  47                 ibm4xx_memstart = reg[1];
  48         else
  49                 /* othersize, read it from the SDRAM controller */
  50                 ibm4xx_sdram_fixup_memsize();
  51 }
  52
  53 static void *iss_4xx_vmlinux_alloc(unsigned long size)
  54 {
  55         return (void *)ibm4xx_memstart;
  56 }
  57
  58 #define SPRN_PIR        0x11E   /* Processor Identification Register */
  59 void platform_init(void)
  60 {
  61         unsigned long end_of_ram = 0x08000000;
  62         unsigned long avail_ram = end_of_ram - (unsigned long)_end;
  63         u32 pir_reg;
  64
  65         simple_alloc_init(_end, avail_ram, 128, 64);
  66         platform_ops.fixups = iss_4xx_fixups;
  67         platform_ops.vmlinux_alloc = iss_4xx_vmlinux_alloc;
  68         platform_ops.exit = ibm44x_dbcr_reset;
  69         pir_reg = mfspr(SPRN_PIR);
  70         fdt_set_boot_cpuid_phys(_dtb_start, pir_reg);
  71         fdt_init(_dtb_start);
  72         serial_console_init();
  73 }