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Linux/arch/powerpc/boot/redboot-83xx.c

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  1 /*
  2  * RedBoot firmware support
  3  *
  4  * Author: Scott Wood <scottwood@freescale.com>
  5  *
  6  * Copyright (c) 2007 Freescale Semiconductor, Inc.
  7  * Copyright (c) 2008 Codehermit
  8  *
  9  * This program is free software; you can redistribute it and/or modify it
 10  * under the terms of the GNU General Public License version 2 as published
 11  * by the Free Software Foundation.
 12  */
 13 
 14 #include "ops.h"
 15 #include "stdio.h"
 16 #include "redboot.h"
 17 #include "fsl-soc.h"
 18 #include "io.h"
 19 
 20 static bd_t bd;
 21 BSS_STACK(4096);
 22 
 23 #define MHZ(x)  ((x + 500000) / 1000000)
 24 
 25 static void platform_fixups(void)
 26 {
 27         void *node;
 28 
 29         dt_fixup_memory(bd.bi_memstart, bd.bi_memsize);
 30         dt_fixup_mac_addresses(bd.bi_enetaddr);
 31         dt_fixup_cpu_clocks(bd.bi_intfreq, bd.bi_busfreq / 16, bd.bi_busfreq);
 32 
 33         node = finddevice("/soc/cpm/brg");
 34         if (node) {
 35                 printf("BRG clock-frequency <- 0x%x (%dMHz)\r\n",
 36                        bd.bi_busfreq, MHZ(bd.bi_busfreq));
 37                 setprop(node, "clock-frequency",  &bd.bi_busfreq, 4);
 38         }
 39 
 40 }
 41 
 42 void platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
 43                    unsigned long r6, unsigned long r7)
 44 {
 45         memcpy(&bd, (char *)r3, sizeof(bd));
 46 
 47         if (bd.bi_tag != 0x42444944)
 48                 return;
 49 
 50         simple_alloc_init(_end,
 51                           bd.bi_memstart + bd.bi_memsize - (unsigned long)_end,
 52                           32, 64);
 53 
 54         fdt_init(_dtb_start);
 55         serial_console_init();
 56         platform_ops.fixups = platform_fixups;
 57 
 58         loader_info.cmdline = (char *)bd.bi_cmdline;
 59         loader_info.cmdline_len = strlen((char *)bd.bi_cmdline);
 60 }
 61 

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