Linux 3.17-rc2
[linux/fpc-iii.git] / arch / mips / mti-malta / malta-memory.c
blob8fddd2cdbff72920cb7a9c73154a7b95413fb306
1 /*
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
4 * for more details.
6 * PROM library functions for acquiring/using memory descriptors given to
7 * us from the YAMON.
9 * Copyright (C) 1999,2000,2012 MIPS Technologies, Inc.
10 * All rights reserved.
11 * Authors: Carsten Langgaard <carstenl@mips.com>
12 * Steven J. Hill <sjhill@mips.com>
14 #include <linux/init.h>
15 #include <linux/bootmem.h>
16 #include <linux/string.h>
18 #include <asm/bootinfo.h>
19 #include <asm/maar.h>
20 #include <asm/sections.h>
21 #include <asm/fw/fw.h>
23 static fw_memblock_t mdesc[FW_MAX_MEMBLOCKS];
25 /* determined physical memory size, not overridden by command line args */
26 unsigned long physical_memsize = 0L;
28 fw_memblock_t * __init fw_getmdesc(int eva)
30 char *memsize_str, *ememsize_str = NULL, *ptr;
31 unsigned long memsize = 0, ememsize = 0;
32 static char cmdline[COMMAND_LINE_SIZE] __initdata;
33 int tmp;
35 /* otherwise look in the environment */
37 memsize_str = fw_getenv("memsize");
38 if (memsize_str) {
39 tmp = kstrtoul(memsize_str, 0, &memsize);
40 if (tmp)
41 pr_warn("Failed to read the 'memsize' env variable.\n");
43 if (eva) {
44 /* Look for ememsize for EVA */
45 ememsize_str = fw_getenv("ememsize");
46 if (ememsize_str) {
47 tmp = kstrtoul(ememsize_str, 0, &ememsize);
48 if (tmp)
49 pr_warn("Failed to read the 'ememsize' env variable.\n");
52 if (!memsize && !ememsize) {
53 pr_warn("memsize not set in YAMON, set to default (32Mb)\n");
54 physical_memsize = 0x02000000;
55 } else {
56 /* If ememsize is set, then set physical_memsize to that */
57 physical_memsize = ememsize ? : memsize;
60 #ifdef CONFIG_CPU_BIG_ENDIAN
61 /* SOC-it swaps, or perhaps doesn't swap, when DMA'ing the last
62 word of physical memory */
63 physical_memsize -= PAGE_SIZE;
64 #endif
66 /* Check the command line for a memsize directive that overrides
67 the physical/default amount */
68 strcpy(cmdline, arcs_cmdline);
69 ptr = strstr(cmdline, "memsize=");
70 if (ptr && (ptr != cmdline) && (*(ptr - 1) != ' '))
71 ptr = strstr(ptr, " memsize=");
72 /* And now look for ememsize */
73 if (eva) {
74 ptr = strstr(cmdline, "ememsize=");
75 if (ptr && (ptr != cmdline) && (*(ptr - 1) != ' '))
76 ptr = strstr(ptr, " ememsize=");
79 if (ptr)
80 memsize = memparse(ptr + 8 + (eva ? 1 : 0), &ptr);
81 else
82 memsize = physical_memsize;
84 /* Last 64K for HIGHMEM arithmetics */
85 if (memsize > 0x7fff0000)
86 memsize = 0x7fff0000;
88 memset(mdesc, 0, sizeof(mdesc));
90 mdesc[0].type = fw_dontuse;
91 mdesc[0].base = PHYS_OFFSET;
92 mdesc[0].size = 0x00001000;
94 mdesc[1].type = fw_code;
95 mdesc[1].base = mdesc[0].base + 0x00001000UL;
96 mdesc[1].size = 0x000ef000;
99 * The area 0x000f0000-0x000fffff is allocated for BIOS memory by the
100 * south bridge and PCI access always forwarded to the ISA Bus and
101 * BIOSCS# is always generated.
102 * This mean that this area can't be used as DMA memory for PCI
103 * devices.
105 mdesc[2].type = fw_dontuse;
106 mdesc[2].base = mdesc[0].base + 0x000f0000UL;
107 mdesc[2].size = 0x00010000;
109 mdesc[3].type = fw_dontuse;
110 mdesc[3].base = mdesc[0].base + 0x00100000UL;
111 mdesc[3].size = CPHYSADDR(PFN_ALIGN((unsigned long)&_end)) -
112 0x00100000UL;
114 mdesc[4].type = fw_free;
115 mdesc[4].base = mdesc[0].base + CPHYSADDR(PFN_ALIGN(&_end));
116 mdesc[4].size = memsize - CPHYSADDR(mdesc[4].base);
118 return &mdesc[0];
121 static void free_init_pages_eva_malta(void *begin, void *end)
123 free_init_pages("unused kernel", __pa_symbol((unsigned long *)begin),
124 __pa_symbol((unsigned long *)end));
127 static int __init fw_memtype_classify(unsigned int type)
129 switch (type) {
130 case fw_free:
131 return BOOT_MEM_RAM;
132 case fw_code:
133 return BOOT_MEM_ROM_DATA;
134 default:
135 return BOOT_MEM_RESERVED;
139 void __init fw_meminit(void)
141 fw_memblock_t *p;
143 p = fw_getmdesc(config_enabled(CONFIG_EVA));
144 free_init_pages_eva = (config_enabled(CONFIG_EVA) ?
145 free_init_pages_eva_malta : NULL);
147 while (p->size) {
148 long type;
149 unsigned long base, size;
151 type = fw_memtype_classify(p->type);
152 base = p->base;
153 size = p->size;
155 add_memory_region(base, size, type);
156 p++;
160 void __init prom_free_prom_memory(void)
162 unsigned long addr;
163 int i;
165 for (i = 0; i < boot_mem_map.nr_map; i++) {
166 if (boot_mem_map.map[i].type != BOOT_MEM_ROM_DATA)
167 continue;
169 addr = boot_mem_map.map[i].addr;
170 free_init_pages("YAMON memory",
171 addr, addr + boot_mem_map.map[i].size);
175 unsigned platform_maar_init(unsigned num_pairs)
177 phys_addr_t mem_end = (physical_memsize & ~0xffffull) - 1;
178 struct maar_config cfg[] = {
179 /* DRAM preceding I/O */
180 { 0x00000000, 0x0fffffff, MIPS_MAAR_S },
182 /* DRAM following I/O */
183 { 0x20000000, mem_end, MIPS_MAAR_S },
185 /* DRAM alias in upper half of physical */
186 { 0x80000000, 0x80000000 + mem_end, MIPS_MAAR_S },
188 unsigned i, num_cfg = ARRAY_SIZE(cfg);
190 /* If DRAM fits before I/O, drop the region following it */
191 if (physical_memsize <= 0x10000000) {
192 num_cfg--;
193 for (i = 1; i < num_cfg; i++)
194 cfg[i] = cfg[i + 1];
197 return maar_config(cfg, num_cfg, num_pairs);