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/maar.h> 20 #include <asm/sections.h> 21 #include <asm/fw/fw.h> 22 23 static fw_memblock_t mdesc[FW_MAX_MEMBLOCKS]; 24 25 /* determined physical memory size, not overridden by command line args */ 26 unsigned long physical_memsize = 0L; 27 28 fw_memblock_t * __init fw_getmdesc(int eva) 29 { 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; 34 35 /* otherwise look in the environment */ 36 37 memsize_str = fw_getenv("memsize"); 38 if (memsize_str) 39 tmp = kstrtol(memsize_str, 0, &memsize); 40 if (eva) { 41 /* Look for ememsize for EVA */ 42 ememsize_str = fw_getenv("ememsize"); 43 if (ememsize_str) 44 tmp = kstrtol(ememsize_str, 0, &ememsize); 45 } 46 if (!memsize && !ememsize) { 47 pr_warn("memsize not set in YAMON, set to default (32Mb)\n"); 48 physical_memsize = 0x02000000; 49 } else { 50 /* If ememsize is set, then set physical_memsize to that */ 51 physical_memsize = ememsize ? : memsize; 52 } 53 54 #ifdef CONFIG_CPU_BIG_ENDIAN 55 /* SOC-it swaps, or perhaps doesn't swap, when DMA'ing the last 56 word of physical memory */ 57 physical_memsize -= PAGE_SIZE; 58 #endif 59 60 /* Check the command line for a memsize directive that overrides 61 the physical/default amount */ 62 strcpy(cmdline, arcs_cmdline); 63 ptr = strstr(cmdline, "memsize="); 64 if (ptr && (ptr != cmdline) && (*(ptr - 1) != ' ')) 65 ptr = strstr(ptr, " memsize="); 66 /* And now look for ememsize */ 67 if (eva) { 68 ptr = strstr(cmdline, "ememsize="); 69 if (ptr && (ptr != cmdline) && (*(ptr - 1) != ' ')) 70 ptr = strstr(ptr, " ememsize="); 71 } 72 73 if (ptr) 74 memsize = memparse(ptr + 8 + (eva ? 1 : 0), &ptr); 75 else 76 memsize = physical_memsize; 77 78 /* Last 64K for HIGHMEM arithmetics */ 79 if (memsize > 0x7fff0000) 80 memsize = 0x7fff0000; 81 82 memset(mdesc, 0, sizeof(mdesc)); 83 84 mdesc[0].type = fw_dontuse; 85 mdesc[0].base = PHYS_OFFSET; 86 mdesc[0].size = 0x00001000; 87 88 mdesc[1].type = fw_code; 89 mdesc[1].base = mdesc[0].base + 0x00001000UL; 90 mdesc[1].size = 0x000ef000; 91 92 /* 93 * The area 0x000f0000-0x000fffff is allocated for BIOS memory by the 94 * south bridge and PCI access always forwarded to the ISA Bus and 95 * BIOSCS# is always generated. 96 * This mean that this area can't be used as DMA memory for PCI 97 * devices. 98 */ 99 mdesc[2].type = fw_dontuse; 100 mdesc[2].base = mdesc[0].base + 0x000f0000UL; 101 mdesc[2].size = 0x00010000; 102 103 mdesc[3].type = fw_dontuse; 104 mdesc[3].base = mdesc[0].base + 0x00100000UL; 105 mdesc[3].size = CPHYSADDR(PFN_ALIGN((unsigned long)&_end)) - 106 0x00100000UL; 107 108 mdesc[4].type = fw_free; 109 mdesc[4].base = mdesc[0].base + CPHYSADDR(PFN_ALIGN(&_end)); 110 mdesc[4].size = memsize - CPHYSADDR(mdesc[4].base); 111 112 return &mdesc[0]; 113 } 114 115 static void free_init_pages_eva_malta(void *begin, void *end) 116 { 117 free_init_pages("unused kernel", __pa_symbol((unsigned long *)begin), 118 __pa_symbol((unsigned long *)end)); 119 } 120 121 static int __init fw_memtype_classify(unsigned int type) 122 { 123 switch (type) { 124 case fw_free: 125 return BOOT_MEM_RAM; 126 case fw_code: 127 return BOOT_MEM_ROM_DATA; 128 default: 129 return BOOT_MEM_RESERVED; 130 } 131 } 132 133 void __init fw_meminit(void) 134 { 135 fw_memblock_t *p; 136 137 p = fw_getmdesc(config_enabled(CONFIG_EVA)); 138 free_init_pages_eva = (config_enabled(CONFIG_EVA) ? 139 free_init_pages_eva_malta : NULL); 140 141 while (p->size) { 142 long type; 143 unsigned long base, size; 144 145 type = fw_memtype_classify(p->type); 146 base = p->base; 147 size = p->size; 148 149 add_memory_region(base, size, type); 150 p++; 151 } 152 } 153 154 void __init prom_free_prom_memory(void) 155 { 156 unsigned long addr; 157 int i; 158 159 for (i = 0; i < boot_mem_map.nr_map; i++) { 160 if (boot_mem_map.map[i].type != BOOT_MEM_ROM_DATA) 161 continue; 162 163 addr = boot_mem_map.map[i].addr; 164 free_init_pages("YAMON memory", 165 addr, addr + boot_mem_map.map[i].size); 166 } 167 } 168 169 unsigned platform_maar_init(unsigned num_pairs) 170 { 171 phys_addr_t mem_end = (physical_memsize & ~0xffffull) - 1; 172 struct maar_config cfg[] = { 173 /* DRAM preceding I/O */ 174 { 0x00000000, 0x0fffffff, MIPS_MAAR_S }, 175 176 /* DRAM following I/O */ 177 { 0x20000000, mem_end, MIPS_MAAR_S }, 178 179 /* DRAM alias in upper half of physical */ 180 { 0x80000000, 0x80000000 + mem_end, MIPS_MAAR_S }, 181 }; 182 unsigned i, num_cfg = ARRAY_SIZE(cfg); 183 184 /* If DRAM fits before I/O, drop the region following it */ 185 if (physical_memsize <= 0x10000000) { 186 num_cfg--; 187 for (i = 1; i < num_cfg; i++) 188 cfg[i] = cfg[i + 1]; 189 } 190 191 return maar_config(cfg, num_cfg, num_pairs); 192 } 193