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/arch/powerpc/boot/treeboot-iss4xx.c

https://github.com/aicjofs/android_kernel_lge_v500_20d_f2fs
C | 77 lines | 48 code | 7 blank | 22 comment | 2 complexity | 396129584ed7051117fbe4ce1c049ad9 MD5 | raw file
 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
35BSS_STACK(4096);
36
37static u32 ibm4xx_memstart;
38
39static 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
57static void *iss_4xx_vmlinux_alloc(unsigned long size)
58{
59	return (void *)ibm4xx_memstart;
60}
61
62#define SPRN_PIR	0x11E	/* Processor Indentification Register */
63void 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}