2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
6 * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved.
8 #include <linux/bootmem.h>
10 #include <asm/bootinfo.h>
11 #include <asm/sections.h>
12 #include <asm/mips-boards/prom.h>
20 static struct prom_pmemblock mdesc
[PROM_MAX_PMEMBLOCKS
];
22 /* determined physical memory size, not overridden by command line args */
23 unsigned long physical_memsize
= 0L;
25 struct prom_pmemblock
* __init
prom_getmdesc(void)
27 char *memsize_str
, *ptr
;
29 static char cmdline
[COMMAND_LINE_SIZE
] __initdata
;
33 /* otherwise look in the environment */
34 memsize_str
= prom_getenv("memsize");
36 pr_warn("memsize not set in boot prom, set to default 32Mb\n");
37 physical_memsize
= 0x02000000;
39 tmp
= kstrtol(memsize_str
, 0, &val
);
40 physical_memsize
= (unsigned long)val
;
43 #ifdef CONFIG_CPU_BIG_ENDIAN
44 /* SOC-it swaps, or perhaps doesn't swap, when DMA'ing the last
45 word of physical memory */
46 physical_memsize
-= PAGE_SIZE
;
49 /* Check the command line for a memsize directive that overrides
50 the physical/default amount */
51 strcpy(cmdline
, arcs_cmdline
);
52 ptr
= strstr(cmdline
, "memsize=");
53 if (ptr
&& (ptr
!= cmdline
) && (*(ptr
- 1) != ' '))
54 ptr
= strstr(ptr
, " memsize=");
57 memsize
= memparse(ptr
+ 8, &ptr
);
59 memsize
= physical_memsize
;
61 memset(mdesc
, 0, sizeof(mdesc
));
63 mdesc
[0].type
= yamon_dontuse
;
64 mdesc
[0].base
= 0x00000000;
65 mdesc
[0].size
= 0x00001000;
67 mdesc
[1].type
= yamon_prom
;
68 mdesc
[1].base
= 0x00001000;
69 mdesc
[1].size
= 0x000ef000;
72 * The area 0x000f0000-0x000fffff is allocated for BIOS memory by the
73 * south bridge and PCI access always forwarded to the ISA Bus and
74 * BIOSCS# is always generated.
75 * This mean that this area can't be used as DMA memory for PCI
78 mdesc
[2].type
= yamon_dontuse
;
79 mdesc
[2].base
= 0x000f0000;
80 mdesc
[2].size
= 0x00010000;
82 mdesc
[3].type
= yamon_dontuse
;
83 mdesc
[3].base
= 0x00100000;
84 mdesc
[3].size
= CPHYSADDR(PFN_ALIGN((unsigned long)&_end
)) -
87 mdesc
[4].type
= yamon_free
;
88 mdesc
[4].base
= CPHYSADDR(PFN_ALIGN(&_end
));
89 mdesc
[4].size
= memsize
- mdesc
[4].base
;
94 static int __init
prom_memtype_classify(unsigned int type
)
100 return BOOT_MEM_ROM_DATA
;
102 return BOOT_MEM_RESERVED
;
106 void __init
prom_meminit(void)
108 struct prom_pmemblock
*p
;
114 unsigned long base
, size
;
116 type
= prom_memtype_classify(p
->type
);
120 add_memory_region(base
, size
, type
);
125 void __init
prom_free_prom_memory(void)
130 for (i
= 0; i
< boot_mem_map
.nr_map
; i
++) {
131 if (boot_mem_map
.map
[i
].type
!= BOOT_MEM_ROM_DATA
)
134 addr
= boot_mem_map
.map
[i
].addr
;
135 free_init_pages("prom memory",
136 addr
, addr
+ boot_mem_map
.map
[i
].size
);
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