arch/mips/mti-malta/malta-memory.c

   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 }