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 * PROM library functions for acquiring/using memory descriptors given to
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>
21 #include <asm/sections.h>
22 #include <asm/fw/fw.h>
24 static fw_memblock_t mdesc[FW_MAX_MEMBLOCKS];
26 /* determined physical memory size, not overridden by command line args */
27 unsigned long physical_memsize = 0L;
29 fw_memblock_t * __init fw_getmdesc(int eva)
31 char *memsize_str, *ememsize_str = NULL, *ptr;
32 unsigned long memsize = 0, ememsize = 0;
33 static char cmdline[COMMAND_LINE_SIZE] __initdata;
36 /* otherwise look in the environment */
38 memsize_str = fw_getenv("memsize");
40 tmp = kstrtoul(memsize_str, 0, &memsize);
42 pr_warn("Failed to read the 'memsize' env variable.\n");
45 /* Look for ememsize for EVA */
46 ememsize_str = fw_getenv("ememsize");
48 tmp = kstrtoul(ememsize_str, 0, &ememsize);
50 pr_warn("Failed to read the 'ememsize' env variable.\n");
53 if (!memsize && !ememsize) {
54 pr_warn("memsize not set in YAMON, set to default (32Mb)\n");
55 physical_memsize = 0x02000000;
57 if (memsize > (256 << 20)) { /* memsize should be capped to 256M */
58 pr_warn("Unsupported memsize value (0x%lx) detected! "
59 "Using 0x10000000 (256M) instead\n",
63 /* If ememsize is set, then set physical_memsize to that */
64 physical_memsize = ememsize ? : memsize;
67 #ifdef CONFIG_CPU_BIG_ENDIAN
68 /* SOC-it swaps, or perhaps doesn't swap, when DMA'ing the last
69 word of physical memory */
70 physical_memsize -= PAGE_SIZE;
73 /* Check the command line for a memsize directive that overrides
74 the physical/default amount */
75 strcpy(cmdline, arcs_cmdline);
76 ptr = strstr(cmdline, "memsize=");
77 if (ptr && (ptr != cmdline) && (*(ptr - 1) != ' '))
78 ptr = strstr(ptr, " memsize=");
79 /* And now look for ememsize */
81 ptr = strstr(cmdline, "ememsize=");
82 if (ptr && (ptr != cmdline) && (*(ptr - 1) != ' '))
83 ptr = strstr(ptr, " ememsize=");
87 memsize = memparse(ptr + 8 + (eva ? 1 : 0), &ptr);
89 memsize = physical_memsize;
91 /* Last 64K for HIGHMEM arithmetics */
92 if (memsize > 0x7fff0000)
95 memset(mdesc, 0, sizeof(mdesc));
97 mdesc[0].type = fw_dontuse;
98 mdesc[0].base = PHYS_OFFSET;
99 mdesc[0].size = 0x00001000;
101 mdesc[1].type = fw_code;
102 mdesc[1].base = mdesc[0].base + 0x00001000UL;
103 mdesc[1].size = 0x000ef000;
106 * The area 0x000f0000-0x000fffff is allocated for BIOS memory by the
107 * south bridge and PCI access always forwarded to the ISA Bus and
108 * BIOSCS# is always generated.
109 * This mean that this area can't be used as DMA memory for PCI
112 mdesc[2].type = fw_dontuse;
113 mdesc[2].base = mdesc[0].base + 0x000f0000UL;
114 mdesc[2].size = 0x00010000;
116 mdesc[3].type = fw_dontuse;
117 mdesc[3].base = mdesc[0].base + 0x00100000UL;
118 mdesc[3].size = CPHYSADDR(PFN_ALIGN((unsigned long)&_end)) -
121 mdesc[4].type = fw_free;
122 mdesc[4].base = mdesc[0].base + CPHYSADDR(PFN_ALIGN(&_end));
123 mdesc[4].size = memsize - CPHYSADDR(mdesc[4].base);
128 static void free_init_pages_eva_malta(void *begin, void *end)
130 free_init_pages("unused kernel", __pa_symbol((unsigned long *)begin),
131 __pa_symbol((unsigned long *)end));
134 static int __init fw_memtype_classify(unsigned int type)
140 return BOOT_MEM_ROM_DATA;
142 return BOOT_MEM_RESERVED;
146 void __init fw_meminit(void)
150 p = fw_getmdesc(config_enabled(CONFIG_EVA));
151 free_init_pages_eva = (config_enabled(CONFIG_EVA) ?
152 free_init_pages_eva_malta : NULL);
156 unsigned long base, size;
158 type = fw_memtype_classify(p->type);
162 add_memory_region(base, size, type);
167 void __init prom_free_prom_memory(void)
172 for (i = 0; i < boot_mem_map.nr_map; i++) {
173 if (boot_mem_map.map[i].type != BOOT_MEM_ROM_DATA)
176 addr = boot_mem_map.map[i].addr;
177 free_init_pages("YAMON memory",
178 addr, addr + boot_mem_map.map[i].size);
182 phys_addr_t mips_cdmm_phys_base(void)
184 /* This address is "typically unused" */