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 = kstrtoul(memsize_str, 0, &memsize);
  40                 if (tmp)
  41                         pr_warn("Failed to read the 'memsize' env variable.\n");
  42         }
  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");
  50                 }
  51         }
  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;
  58         }
  59
  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
  65
  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=");
  77         }
  78
  79         if (ptr)
  80                 memsize = memparse(ptr + 8 + (eva ? 1 : 0), &ptr);
  81         else
  82                 memsize = physical_memsize;
  83
  84         /* Last 64K for HIGHMEM arithmetics */
  85         if (memsize > 0x7fff0000)
  86                 memsize = 0x7fff0000;
  87
  88         memset(mdesc, 0, sizeof(mdesc));
  89
  90         mdesc[0].type = fw_dontuse;
  91         mdesc[0].base = PHYS_OFFSET;
  92         mdesc[0].size = 0x00001000;
  93
  94         mdesc[1].type = fw_code;
  95         mdesc[1].base = mdesc[0].base + 0x00001000UL;
  96         mdesc[1].size = 0x000ef000;
  97
  98         /*
  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.
 104          */
 105         mdesc[2].type = fw_dontuse;
 106         mdesc[2].base = mdesc[0].base + 0x000f0000UL;
 107         mdesc[2].size = 0x00010000;
 108
 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;
 113
 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);
 117
 118         return &mdesc[0];
 119 }
 120
 121 static void free_init_pages_eva_malta(void *begin, void *end)
 122 {
 123         free_init_pages("unused kernel", __pa_symbol((unsigned long *)begin),
 124                         __pa_symbol((unsigned long *)end));
 125 }
 126
 127 static int __init fw_memtype_classify(unsigned int type)
 128 {
 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;
 136         }
 137 }
 138
 139 void __init fw_meminit(void)
 140 {
 141         fw_memblock_t *p;
 142
 143         p = fw_getmdesc(config_enabled(CONFIG_EVA));
 144         free_init_pages_eva = (config_enabled(CONFIG_EVA) ?
 145                                free_init_pages_eva_malta : NULL);
 146
 147         while (p->size) {
 148                 long type;
 149                 unsigned long base, size;
 150
 151                 type = fw_memtype_classify(p->type);
 152                 base = p->base;
 153                 size = p->size;
 154
 155                 add_memory_region(base, size, type);
 156                 p++;
 157         }
 158 }
 159
 160 void __init prom_free_prom_memory(void)
 161 {
 162         unsigned long addr;
 163         int i;
 164
 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;
 168
 169                 addr = boot_mem_map.map[i].addr;
 170                 free_init_pages("YAMON memory",
 171                                 addr, addr + boot_mem_map.map[i].size);
 172         }
 173 }
 174
 175 unsigned platform_maar_init(unsigned num_pairs)
 176 {
 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 },
 181
 182                 /* DRAM following I/O */
 183                 { 0x20000000, mem_end, MIPS_MAAR_S },
 184
 185                 /* DRAM alias in upper half of physical */
 186                 { 0x80000000, 0x80000000 + mem_end, MIPS_MAAR_S },
 187         };
 188         unsigned i, num_cfg = ARRAY_SIZE(cfg);
 189
 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];
 195         }
 196
 197         return maar_config(cfg, num_cfg, num_pairs);
 198 }