aboutsummaryrefslogtreecommitdiffstats
path: root/arch/mips/mti-malta/malta-memory.c
blob: 1f73d63e92a765d3ab1d829244a19e57dab8bd8e (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * PROM library functions for acquiring/using memory descriptors given to
 * us from the YAMON.
 *
 * Copyright (C) 1999,2000,2012  MIPS Technologies, Inc.
 * All rights reserved.
 * Authors: Carsten Langgaard <carstenl@mips.com>
 *          Steven J. Hill <sjhill@mips.com>
 */
#include <linux/init.h>
#include <linux/bootmem.h>
#include <linux/string.h>

#include <asm/bootinfo.h>
#include <asm/sections.h>
#include <asm/fw/fw.h>

static fw_memblock_t mdesc[FW_MAX_MEMBLOCKS];

/* determined physical memory size, not overridden by command line args	 */
unsigned long physical_memsize = 0L;

fw_memblock_t * __init fw_getmdesc(void)
{
	char *memsize_str, *ptr;
	unsigned int memsize;
	static char cmdline[COMMAND_LINE_SIZE] __initdata;
	long val;
	int tmp;

	/* otherwise look in the environment */
	memsize_str = fw_getenv("memsize");
	if (!memsize_str) {
		pr_warn("memsize not set in YAMON, set to default (32Mb)\n");
		physical_memsize = 0x02000000;
	} else {
		tmp = kstrtol(memsize_str, 0, &val);
		physical_memsize = (unsigned long)val;
	}

#ifdef CONFIG_CPU_BIG_ENDIAN
	/* SOC-it swaps, or perhaps doesn't swap, when DMA'ing the last
	   word of physical memory */
	physical_memsize -= PAGE_SIZE;
#endif

	/* Check the command line for a memsize directive that overrides
	   the physical/default amount */
	strcpy(cmdline, arcs_cmdline);
	ptr = strstr(cmdline, "memsize=");
	if (ptr && (ptr != cmdline) && (*(ptr - 1) != ' '))
		ptr = strstr(ptr, " memsize=");

	if (ptr)
		memsize = memparse(ptr + 8, &ptr);
	else
		memsize = physical_memsize;

	memset(mdesc, 0, sizeof(mdesc));

	mdesc[0].type = fw_dontuse;
	mdesc[0].base = 0x00000000;
	mdesc[0].size = 0x00001000;

	mdesc[1].type = fw_code;
	mdesc[1].base = 0x00001000;
	mdesc[1].size = 0x000ef000;

	/*
	 * The area 0x000f0000-0x000fffff is allocated for BIOS memory by the
	 * south bridge and PCI access always forwarded to the ISA Bus and
	 * BIOSCS# is always generated.
	 * This mean that this area can't be used as DMA memory for PCI
	 * devices.
	 */
	mdesc[2].type = fw_dontuse;
	mdesc[2].base = 0x000f0000;
	mdesc[2].size = 0x00010000;

	mdesc[3].type = fw_dontuse;
	mdesc[3].base = 0x00100000;
	mdesc[3].size = CPHYSADDR(PFN_ALIGN((unsigned long)&_end)) -
		mdesc[3].base;

	mdesc[4].type = fw_free;
	mdesc[4].base = CPHYSADDR(PFN_ALIGN(&_end));
	mdesc[4].size = memsize - mdesc[4].base;

	return &mdesc[0];
}

static int __init fw_memtype_classify(unsigned int type)
{
	switch (type) {
	case fw_free:
		return BOOT_MEM_RAM;
	case fw_code:
		return BOOT_MEM_ROM_DATA;
	default:
		return BOOT_MEM_RESERVED;
	}
}

void __init fw_meminit(void)
{
	fw_memblock_t *p;

	p = fw_getmdesc();

	while (p->size) {
		long type;
		unsigned long base, size;

		type = fw_memtype_classify(p->type);
		base = p->base;
		size = p->size;

		add_memory_region(base, size, type);
		p++;
	}
}

void __init prom_free_prom_memory(void)
{
	unsigned long addr;
	int i;

	for (i = 0; i < boot_mem_map.nr_map; i++) {
		if (boot_mem_map.map[i].type != BOOT_MEM_ROM_DATA)
			continue;

		addr = boot_mem_map.map[i].addr;
		free_init_pages("YAMON memory",
				addr, addr + boot_mem_map.map[i].size);
	}
}