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

http://github.com/mirrors/linux
C | 73 lines | 48 code | 7 blank | 18 comment | 2 complexity | 43029e7d5d3bbf426b49a6a43e90c704 MD5 | raw file
 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
31BSS_STACK(4096);
32
33static u32 ibm4xx_memstart;
34
35static 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
53static void *iss_4xx_vmlinux_alloc(unsigned long size)
54{
55	return (void *)ibm4xx_memstart;
56}
57
58#define SPRN_PIR	0x11E	/* Processor Identification Register */
59void 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}