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 
35 BSS_STACK(4096);
36 
37 static u32 ibm4xx_memstart;
38 
39 static 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 
57 static void *iss_4xx_vmlinux_alloc(unsigned long size)
58 {
59 	return (void *)ibm4xx_memstart;
60 }
61 
62 #define SPRN_PIR	0x11E	/* Processor Identification Register */
63 void 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 }
78