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. 5 * 6 * PROM library functions for acquiring/using memory descriptors given to 7 * us from the YAMON. 8 * 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> 13 */ 14 #include <linux/init.h> 15 #include <linux/bootmem.h> 16 #include <linux/string.h> 17 18 #include <asm/bootinfo.h> 19 #include <asm/sections.h> 20 #include <asm/fw/fw.h> 21 22 static fw_memblock_t mdesc[FW_MAX_MEMBLOCKS]; 23 24 /* determined physical memory size, not overridden by command line args */ 25 unsigned long physical_memsize = 0L; 26 27 fw_memblock_t * __init fw_getmdesc(int eva) 28 { 29 char *memsize_str, *ememsize_str __maybe_unused = NULL, *ptr; 30 unsigned long memsize, ememsize __maybe_unused = 0; 31 static char cmdline[COMMAND_LINE_SIZE] __initdata; 32 int tmp; 33 34 /* otherwise look in the environment */ 35 36 memsize_str = fw_getenv("memsize"); 37 if (memsize_str) 38 tmp = kstrtol(memsize_str, 0, &memsize); 39 if (eva) { 40 /* Look for ememsize for EVA */ 41 ememsize_str = fw_getenv("ememsize"); 42 if (ememsize_str) 43 tmp = kstrtol(ememsize_str, 0, &ememsize); 44 } 45 if (!memsize && !ememsize) { 46 pr_warn("memsize not set in YAMON, set to default (32Mb)\n"); 47 physical_memsize = 0x02000000; 48 } else { 49 /* If ememsize is set, then set physical_memsize to that */ 50 physical_memsize = ememsize ? : memsize; 51 } 52 53 #ifdef CONFIG_CPU_BIG_ENDIAN 54 /* SOC-it swaps, or perhaps doesn't swap, when DMA'ing the last 55 word of physical memory */ 56 physical_memsize -= PAGE_SIZE; 57 #endif 58 59 /* Check the command line for a memsize directive that overrides 60 the physical/default amount */ 61 strcpy(cmdline, arcs_cmdline); 62 ptr = strstr(cmdline, "memsize="); 63 if (ptr && (ptr != cmdline) && (*(ptr - 1) != ' ')) 64 ptr = strstr(ptr, " memsize="); 65 /* And now look for ememsize */ 66 if (eva) { 67 ptr = strstr(cmdline, "ememsize="); 68 if (ptr && (ptr != cmdline) && (*(ptr - 1) != ' ')) 69 ptr = strstr(ptr, " ememsize="); 70 } 71 72 if (ptr) 73 memsize = memparse(ptr + 8 + (eva ? 1 : 0), &ptr); 74 else 75 memsize = physical_memsize; 76 77 /* Last 64K for HIGHMEM arithmetics */ 78 if (memsize > 0x7fff0000) 79 memsize = 0x7fff0000; 80 81 memset(mdesc, 0, sizeof(mdesc)); 82 83 mdesc[0].type = fw_dontuse; 84 mdesc[0].base = PHYS_OFFSET; 85 mdesc[0].size = 0x00001000; 86 87 mdesc[1].type = fw_code; 88 mdesc[1].base = mdesc[0].base + 0x00001000UL; 89 mdesc[1].size = 0x000ef000; 90 91 /* 92 * The area 0x000f0000-0x000fffff is allocated for BIOS memory by the 93 * south bridge and PCI access always forwarded to the ISA Bus and 94 * BIOSCS# is always generated. 95 * This mean that this area can't be used as DMA memory for PCI 96 * devices. 97 */ 98 mdesc[2].type = fw_dontuse; 99 mdesc[2].base = mdesc[0].base + 0x000f0000UL; 100 mdesc[2].size = 0x00010000; 101 102 mdesc[3].type = fw_dontuse; 103 mdesc[3].base = mdesc[0].base + 0x00100000UL; 104 mdesc[3].size = CPHYSADDR(PFN_ALIGN((unsigned long)&_end)) - 105 0x00100000UL; 106 107 mdesc[4].type = fw_free; 108 mdesc[4].base = mdesc[0].base + CPHYSADDR(PFN_ALIGN(&_end)); 109 mdesc[4].size = memsize - CPHYSADDR(mdesc[4].base); 110 111 return &mdesc[0]; 112 } 113 114 static void free_init_pages_eva_malta(void *begin, void *end) 115 { 116 free_init_pages("unused kernel", __pa_symbol((unsigned long *)begin), 117 __pa_symbol((unsigned long *)end)); 118 } 119 120 static int __init fw_memtype_classify(unsigned int type) 121 { 122 switch (type) { 123 case fw_free: 124 return BOOT_MEM_RAM; 125 case fw_code: 126 return BOOT_MEM_ROM_DATA; 127 default: 128 return BOOT_MEM_RESERVED; 129 } 130 } 131 132 void __init fw_meminit(void) 133 { 134 fw_memblock_t *p; 135 136 p = fw_getmdesc(config_enabled(CONFIG_EVA)); 137 free_init_pages_eva = (config_enabled(CONFIG_EVA) ? 138 free_init_pages_eva_malta : NULL); 139 140 while (p->size) { 141 long type; 142 unsigned long base, size; 143 144 type = fw_memtype_classify(p->type); 145 base = p->base; 146 size = p->size; 147 148 add_memory_region(base, size, type); 149 p++; 150 } 151 } 152 153 void __init prom_free_prom_memory(void) 154 { 155 unsigned long addr; 156 int i; 157 158 for (i = 0; i < boot_mem_map.nr_map; i++) { 159 if (boot_mem_map.map[i].type != BOOT_MEM_ROM_DATA) 160 continue; 161 162 addr = boot_mem_map.map[i].addr; 163 free_init_pages("YAMON memory", 164 addr, addr + boot_mem_map.map[i].size); 165 } 166 } 167