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/cdmm.h>
  20 #include <asm/maar.h>
  21 #include <asm/sections.h>
  22 #include <asm/fw/fw.h>
  23
  24 static fw_memblock_t mdesc[FW_MAX_MEMBLOCKS];
  25
  26 /* determined physical memory size, not overridden by command line args  */
  27 unsigned long physical_memsize = 0L;
  28
  29 fw_memblock_t * __init fw_getmdesc(int eva)
  30 {
  31         char *memsize_str, *ememsize_str = NULL, *ptr;
  32         unsigned long memsize = 0, ememsize = 0;
  33         static char cmdline[COMMAND_LINE_SIZE] __initdata;
  34         int tmp;
  35
  36         /* otherwise look in the environment */
  37
  38         memsize_str = fw_getenv("memsize");
  39         if (memsize_str) {
  40                 tmp = kstrtoul(memsize_str, 0, &memsize);
  41                 if (tmp)
  42                         pr_warn("Failed to read the 'memsize' env variable.\n");
  43         }
  44         if (eva) {
  45         /* Look for ememsize for EVA */
  46                 ememsize_str = fw_getenv("ememsize");
  47                 if (ememsize_str) {
  48                         tmp = kstrtoul(ememsize_str, 0, &ememsize);
  49                         if (tmp)
  50                                 pr_warn("Failed to read the 'ememsize' env variable.\n");
  51                 }
  52         }
  53         if (!memsize && !ememsize) {
  54                 pr_warn("memsize not set in YAMON, set to default (32Mb)\n");
  55                 physical_memsize = 0x02000000;
  56         } else {
  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",
  60                                 memsize);
  61                         memsize = 256 << 20;
  62                 }
  63                 /* If ememsize is set, then set physical_memsize to that */
  64                 physical_memsize = ememsize ? : memsize;
  65         }
  66
  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;
  71 #endif
  72
  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 */
  80         if (eva) {
  81                 ptr = strstr(cmdline, "ememsize=");
  82                 if (ptr && (ptr != cmdline) && (*(ptr - 1) != ' '))
  83                         ptr = strstr(ptr, " ememsize=");
  84         }
  85
  86         if (ptr)
  87                 memsize = memparse(ptr + 8 + (eva ? 1 : 0), &ptr);
  88         else
  89                 memsize = physical_memsize;
  90
  91         /* Last 64K for HIGHMEM arithmetics */
  92         if (memsize > 0x7fff0000)
  93                 memsize = 0x7fff0000;
  94
  95         memset(mdesc, 0, sizeof(mdesc));
  96
  97         mdesc[0].type = fw_dontuse;
  98         mdesc[0].base = PHYS_OFFSET;
  99         mdesc[0].size = 0x00001000;
 100
 101         mdesc[1].type = fw_code;
 102         mdesc[1].base = mdesc[0].base + 0x00001000UL;
 103         mdesc[1].size = 0x000ef000;
 104
 105         /*
 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
 110          * devices.
 111          */
 112         mdesc[2].type = fw_dontuse;
 113         mdesc[2].base = mdesc[0].base + 0x000f0000UL;
 114         mdesc[2].size = 0x00010000;
 115
 116         mdesc[3].type = fw_dontuse;
 117         mdesc[3].base = mdesc[0].base + 0x00100000UL;
 118         mdesc[3].size = CPHYSADDR(PFN_ALIGN((unsigned long)&_end)) -
 119                 0x00100000UL;
 120
 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);
 124
 125         return &mdesc[0];
 126 }
 127
 128 static void free_init_pages_eva_malta(void *begin, void *end)
 129 {
 130         free_init_pages("unused kernel", __pa_symbol((unsigned long *)begin),
 131                         __pa_symbol((unsigned long *)end));
 132 }
 133
 134 static int __init fw_memtype_classify(unsigned int type)
 135 {
 136         switch (type) {
 137         case fw_free:
 138                 return BOOT_MEM_RAM;
 139         case fw_code:
 140                 return BOOT_MEM_ROM_DATA;
 141         default:
 142                 return BOOT_MEM_RESERVED;
 143         }
 144 }
 145
 146 void __init fw_meminit(void)
 147 {
 148         fw_memblock_t *p;
 149
 150         p = fw_getmdesc(config_enabled(CONFIG_EVA));
 151         free_init_pages_eva = (config_enabled(CONFIG_EVA) ?
 152                                free_init_pages_eva_malta : NULL);
 153
 154         while (p->size) {
 155                 long type;
 156                 unsigned long base, size;
 157
 158                 type = fw_memtype_classify(p->type);
 159                 base = p->base;
 160                 size = p->size;
 161
 162                 add_memory_region(base, size, type);
 163                 p++;
 164         }
 165 }
 166
 167 void __init prom_free_prom_memory(void)
 168 {
 169         unsigned long addr;
 170         int i;
 171
 172         for (i = 0; i < boot_mem_map.nr_map; i++) {
 173                 if (boot_mem_map.map[i].type != BOOT_MEM_ROM_DATA)
 174                         continue;
 175
 176                 addr = boot_mem_map.map[i].addr;
 177                 free_init_pages("YAMON memory",
 178                                 addr, addr + boot_mem_map.map[i].size);
 179         }
 180 }
 181
 182 phys_addr_t mips_cdmm_phys_base(void)
 183 {
 184         /* This address is "typically unused" */
 185         return 0x1fc10000;
 186 }