arch/powerpc/boot/redboot-8xx.c

   1 /*
   2  * RedBoot firmware support
   3  *
   4  * Author: Scott Wood <scottwood@freescale.com>
   5  *
   6  * Copyright (c) 2007 Freescale Semiconductor, Inc.
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU General Public License version 2 as published
  10  * by the Free Software Foundation.
  11  */
  12
  13 #include "ops.h"
  14 #include "stdio.h"
  15 #include "redboot.h"
  16 #include "fsl-soc.h"
  17 #include "io.h"
  18
  19 static bd_t bd;
  20 BSS_STACK(4096);
  21
  22 #define MHZ(x)  ((x + 500000) / 1000000)
  23
  24 static void platform_fixups(void)
  25 {
  26         void *node;
  27
  28         dt_fixup_memory(bd.bi_memstart, bd.bi_memsize);
  29         dt_fixup_mac_addresses(bd.bi_enetaddr);
  30         dt_fixup_cpu_clocks(bd.bi_intfreq, bd.bi_busfreq / 16, bd.bi_busfreq);
  31
  32         node = finddevice("/soc/cpm/brg");
  33         if (node) {
  34                 printf("BRG clock-frequency <- 0x%x (%dMHz)\r\n",
  35                        bd.bi_busfreq, MHZ(bd.bi_busfreq));
  36                 setprop(node, "clock-frequency",  &bd.bi_busfreq, 4);
  37         }
  38 }
  39
  40 void platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
  41                    unsigned long r6, unsigned long r7)
  42 {
  43         memcpy(&bd, (char *)r3, sizeof(bd));
  44
  45         if (bd.bi_tag != 0x42444944)
  46                 return;
  47
  48         simple_alloc_init(_end,
  49                           bd.bi_memstart + bd.bi_memsize - (unsigned long)_end,
  50                           32, 64);
  51
  52         fdt_init(_dtb_start);
  53         serial_console_init();
  54         platform_ops.fixups = platform_fixups;
  55
  56         loader_info.cmdline = (char *)bd.bi_cmdline;
  57         loader_info.cmdline_len = strlen((char *)bd.bi_cmdline);
  58 }