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-rw-r--r--arch/mips/powertv/memory.c186
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diff --git a/arch/mips/powertv/memory.c b/arch/mips/powertv/memory.c
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1/*
2 * Carsten Langgaard, carstenl@mips.com
3 * Copyright (C) 1999,2000 MIPS Technologies, Inc. All rights reserved.
4 * Portions copyright (C) 2009 Cisco Systems, Inc.
5 *
6 * This program is free software; you can distribute it and/or modify it
7 * under the terms of the GNU General Public License (Version 2) as
8 * published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * for more details.
14 *
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
18 *
19 * Apparently originally from arch/mips/malta-memory.c. Modified to work
20 * with the PowerTV bootloader.
21 */
22#include <linux/init.h>
23#include <linux/mm.h>
24#include <linux/bootmem.h>
25#include <linux/pfn.h>
26#include <linux/string.h>
27
28#include <asm/bootinfo.h>
29#include <asm/page.h>
30#include <asm/sections.h>
31
32#include <asm/mips-boards/prom.h>
33
34#include "init.h"
35
36/* Memory constants */
37#define KIBIBYTE(n) ((n) * 1024) /* Number of kibibytes */
38#define MEBIBYTE(n) ((n) * KIBIBYTE(1024)) /* Number of mebibytes */
39#define DEFAULT_MEMSIZE MEBIBYTE(256) /* If no memsize provided */
40#define LOW_MEM_MAX MEBIBYTE(252) /* Max usable low mem */
41#define RES_BOOTLDR_MEMSIZE MEBIBYTE(1) /* Memory reserved for bldr */
42#define BOOT_MEM_SIZE KIBIBYTE(256) /* Memory reserved for bldr */
43#define PHYS_MEM_START 0x10000000 /* Start of physical memory */
44
45unsigned long ptv_memsize;
46
47char __initdata cmdline[COMMAND_LINE_SIZE];
48
49void __init prom_meminit(void)
50{
51 char *memsize_str;
52 unsigned long memsize = 0;
53 unsigned int physend;
54 char *ptr;
55 int low_mem;
56 int high_mem;
57
58 /* Check the command line first for a memsize directive */
59 strcpy(cmdline, arcs_cmdline);
60 ptr = strstr(cmdline, "memsize=");
61 if (ptr && (ptr != cmdline) && (*(ptr - 1) != ' '))
62 ptr = strstr(ptr, " memsize=");
63
64 if (ptr) {
65 memsize = memparse(ptr + 8, &ptr);
66 } else {
67 /* otherwise look in the environment */
68 memsize_str = prom_getenv("memsize");
69
70 if (memsize_str != NULL) {
71 pr_info("prom memsize = %s\n", memsize_str);
72 memsize = simple_strtol(memsize_str, NULL, 0);
73 }
74
75 if (memsize == 0) {
76 if (_prom_memsize != 0) {
77 memsize = _prom_memsize;
78 pr_info("_prom_memsize = 0x%lx\n", memsize);
79 /* add in memory that the bootloader doesn't
80 * report */
81 memsize += BOOT_MEM_SIZE;
82 } else {
83 memsize = DEFAULT_MEMSIZE;
84 pr_info("Memsize not passed by bootloader, "
85 "defaulting to 0x%lx\n", memsize);
86 }
87 }
88 }
89
90 /* Store memsize for diagnostic purposes */
91 ptv_memsize = memsize;
92
93 physend = PFN_ALIGN(&_end) - 0x80000000;
94 if (memsize > LOW_MEM_MAX) {
95 low_mem = LOW_MEM_MAX;
96 high_mem = memsize - low_mem;
97 } else {
98 low_mem = memsize;
99 high_mem = 0;
100 }
101
102/*
103 * TODO: We will use the hard code for memory configuration until
104 * the bootloader releases their device tree to us.
105 */
106 /*
107 * Add the memory reserved for use by the bootloader to the
108 * memory map.
109 */
110 add_memory_region(PHYS_MEM_START, RES_BOOTLDR_MEMSIZE,
111 BOOT_MEM_RESERVED);
112#ifdef CONFIG_HIGHMEM_256_128
113 /*
114 * Add memory in low for general use by the kernel and its friends
115 * (like drivers, applications, etc).
116 */
117 add_memory_region(PHYS_MEM_START + RES_BOOTLDR_MEMSIZE,
118 LOW_MEM_MAX - RES_BOOTLDR_MEMSIZE, BOOT_MEM_RAM);
119 /*
120 * Add the memory reserved for reset vector.
121 */
122 add_memory_region(0x1fc00000, MEBIBYTE(4), BOOT_MEM_RESERVED);
123 /*
124 * Add the memory reserved.
125 */
126 add_memory_region(0x20000000, MEBIBYTE(1024 + 75), BOOT_MEM_RESERVED);
127 /*
128 * Add memory in high for general use by the kernel and its friends
129 * (like drivers, applications, etc).
130 *
131 * 75MB is reserved for devices which are using the memory in high.
132 */
133 add_memory_region(0x60000000 + MEBIBYTE(75), MEBIBYTE(128 - 75),
134 BOOT_MEM_RAM);
135#elif defined CONFIG_HIGHMEM_128_128
136 /*
137 * Add memory in low for general use by the kernel and its friends
138 * (like drivers, applications, etc).
139 */
140 add_memory_region(PHYS_MEM_START + RES_BOOTLDR_MEMSIZE,
141 MEBIBYTE(128) - RES_BOOTLDR_MEMSIZE, BOOT_MEM_RAM);
142 /*
143 * Add the memory reserved.
144 */
145 add_memory_region(PHYS_MEM_START + MEBIBYTE(128),
146 MEBIBYTE(128 + 1024 + 75), BOOT_MEM_RESERVED);
147 /*
148 * Add memory in high for general use by the kernel and its friends
149 * (like drivers, applications, etc).
150 *
151 * 75MB is reserved for devices which are using the memory in high.
152 */
153 add_memory_region(0x60000000 + MEBIBYTE(75), MEBIBYTE(128 - 75),
154 BOOT_MEM_RAM);
155#else
156 /* Add low memory regions for either:
157 * - no-highmemory configuration case -OR-
158 * - highmemory "HIGHMEM_LOWBANK_ONLY" case
159 */
160 /*
161 * Add memory for general use by the kernel and its friends
162 * (like drivers, applications, etc).
163 */
164 add_memory_region(PHYS_MEM_START + RES_BOOTLDR_MEMSIZE,
165 low_mem - RES_BOOTLDR_MEMSIZE, BOOT_MEM_RAM);
166 /*
167 * Add the memory reserved for reset vector.
168 */
169 add_memory_region(0x1fc00000, MEBIBYTE(4), BOOT_MEM_RESERVED);
170#endif
171}
172
173void __init prom_free_prom_memory(void)
174{
175 unsigned long addr;
176 int i;
177
178 for (i = 0; i < boot_mem_map.nr_map; i++) {
179 if (boot_mem_map.map[i].type != BOOT_MEM_ROM_DATA)
180 continue;
181
182 addr = boot_mem_map.map[i].addr;
183 free_init_pages("prom memory",
184 addr, addr + boot_mem_map.map[i].size);
185 }
186}
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