arch/mips/powertv/memory.c

   1 /*
   2  * Carsten Langgaard, carstenl@mips.com
   3  * Copyright (C) 1999,2000 MIPS Technologies, Inc.  All rights reserved.
   4  * Portions copyright (C) 2009 Cisco Systems, Inc.
   5  *
   6  *  This program is free software; you can distribute it and/or modify it
   7  *  under the terms of the GNU General Public License (Version 2) as
   8  *  published by the Free Software Foundation.
   9  *
  10  *  This program is distributed in the hope it will be useful, but WITHOUT
  11  *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13  *  for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License along
  16  *  with this program; if not, write to the Free Software Foundation, Inc.,
  17  *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
  18  *
  19  * Apparently originally from arch/mips/malta-memory.c. Modified to work
  20  * with the PowerTV bootloader.
  21  */
  22 #include <linux/init.h>
  23 #include <linux/mm.h>
  24 #include <linux/bootmem.h>
  25 #include <linux/pfn.h>
  26 #include <linux/string.h>
  27
  28 #include <asm/bootinfo.h>
  29 #include <asm/page.h>
  30 #include <asm/sections.h>
  31
  32 #include <asm/mips-boards/prom.h>
  33 #include <asm/mach-powertv/asic.h>
  34 #include <asm/mach-powertv/ioremap.h>
  35
  36 #include "init.h"
  37
  38 /* Memory constants */
  39 #define KIBIBYTE(n)             ((n) * 1024)    /* Number of kibibytes */
  40 #define MEBIBYTE(n)             ((n) * KIBIBYTE(1024)) /* Number of mebibytes */
  41 #define DEFAULT_MEMSIZE         MEBIBYTE(128)   /* If no memsize provided */
  42
  43 #define BLDR_SIZE       KIBIBYTE(256)           /* Memory reserved for bldr */
  44 #define RV_SIZE         MEBIBYTE(4)             /* Size of reset vector */
  45
  46 #define LOW_MEM_END     0x20000000              /* Highest low memory address */
  47 #define BLDR_ALIAS      0x10000000              /* Bootloader address */
  48 #define RV_PHYS         0x1fc00000              /* Reset vector address */
  49 #define LOW_RAM_END     RV_PHYS                 /* End of real RAM in low mem */
  50
  51 /*
  52  * Very low-level conversion from processor physical address to device
  53  * DMA address for the first bank of memory.
  54  */
  55 #define PHYS_TO_DMA(paddr)      ((paddr) + (CONFIG_LOW_RAM_DMA - LOW_RAM_ALIAS))
  56
  57 unsigned long ptv_memsize;
  58
  59 /*
  60  * struct low_mem_reserved - Items in low memory that are reserved
  61  * @start:      Physical address of item
  62  * @size:       Size, in bytes, of this item
  63  * @is_aliased: True if this is RAM aliased from another location. If false,
  64  *              it is something other than aliased RAM and the RAM in the
  65  *              unaliased address is still visible outside of low memory.
  66  */
  67 struct low_mem_reserved {
  68         phys_addr_t     start;
  69         phys_addr_t     size;
  70         bool            is_aliased;
  71 };
  72
  73 /*
  74  * Must be in ascending address order
  75  */
  76 struct low_mem_reserved low_mem_reserved[] = {
  77         {BLDR_ALIAS, BLDR_SIZE, true},  /* Bootloader RAM */
  78         {RV_PHYS, RV_SIZE, false},      /* Reset vector */
  79 };
  80
  81 /*
  82  * struct mem_layout - layout of a piece of the system RAM
  83  * @phys:       Physical address of the start of this piece of RAM. This is the
  84  *              address at which both the processor and I/O devices see the
  85  *              RAM.
  86  * @alias:      Alias of this piece of memory in order to make it appear in
  87  *              the low memory part of the processor's address space. I/O
  88  *              devices don't see anything here.
  89  * @size:       Size, in bytes, of this piece of RAM
  90  */
  91 struct mem_layout {
  92         phys_addr_t     phys;
  93         phys_addr_t     alias;
  94         phys_addr_t     size;
  95 };
  96
  97 /*
  98  * struct mem_layout_list - list descriptor for layouts of system RAM pieces
  99  * @family:     Specifies the family being described
 100  * @n:          Number of &struct mem_layout elements
 101  * @layout:     Pointer to the list of &mem_layout structures
 102  */
 103 struct mem_layout_list {
 104         enum family_type        family;
 105         size_t                  n;
 106         struct mem_layout       *layout;
 107 };
 108
 109 static struct mem_layout f1500_layout[] = {
 110         {0x20000000, 0x10000000, MEBIBYTE(256)},
 111 };
 112
 113 static struct mem_layout f4500_layout[] = {
 114         {0x40000000, 0x10000000, MEBIBYTE(256)},
 115         {0x20000000, 0x20000000, MEBIBYTE(32)},
 116 };
 117
 118 static struct mem_layout f8500_layout[] = {
 119         {0x40000000, 0x10000000, MEBIBYTE(256)},
 120         {0x20000000, 0x20000000, MEBIBYTE(32)},
 121         {0x30000000, 0x30000000, MEBIBYTE(32)},
 122 };
 123
 124 static struct mem_layout fx600_layout[] = {
 125         {0x20000000, 0x10000000, MEBIBYTE(256)},
 126         {0x60000000, 0x60000000, MEBIBYTE(128)},
 127 };
 128
 129 static struct mem_layout_list layout_list[] = {
 130         {FAMILY_1500, ARRAY_SIZE(f1500_layout), f1500_layout},
 131         {FAMILY_1500VZE, ARRAY_SIZE(f1500_layout), f1500_layout},
 132         {FAMILY_1500VZF, ARRAY_SIZE(f1500_layout), f1500_layout},
 133         {FAMILY_4500, ARRAY_SIZE(f4500_layout), f4500_layout},
 134         {FAMILY_8500, ARRAY_SIZE(f8500_layout), f8500_layout},
 135         {FAMILY_8500RNG, ARRAY_SIZE(f8500_layout), f8500_layout},
 136         {FAMILY_4600, ARRAY_SIZE(fx600_layout), fx600_layout},
 137         {FAMILY_4600VZA, ARRAY_SIZE(fx600_layout), fx600_layout},
 138         {FAMILY_8600, ARRAY_SIZE(fx600_layout), fx600_layout},
 139         {FAMILY_8600VZB, ARRAY_SIZE(fx600_layout), fx600_layout},
 140 };
 141
 142 /* If we can't determine the layout, use this */
 143 static struct mem_layout default_layout[] = {
 144         {0x20000000, 0x10000000, MEBIBYTE(128)},
 145 };
 146
 147 /**
 148  * register_non_ram - register low memory not available for RAM usage
 149  */
 150 static __init void register_non_ram(void)
 151 {
 152         int i;
 153
 154         for (i = 0; i < ARRAY_SIZE(low_mem_reserved); i++)
 155                 add_memory_region(low_mem_reserved[i].start,
 156                         low_mem_reserved[i].size, BOOT_MEM_RESERVED);
 157 }
 158
 159 /**
 160  * get_memsize - get the size of memory as a single bank
 161  */
 162 static phys_addr_t get_memsize(void)
 163 {
 164         static char cmdline[COMMAND_LINE_SIZE] __initdata;
 165         phys_addr_t memsize = 0;
 166         char *memsize_str;
 167         char *ptr;
 168
 169         /* Check the command line first for a memsize directive */
 170         strcpy(cmdline, arcs_cmdline);
 171         ptr = strstr(cmdline, "memsize=");
 172         if (ptr && (ptr != cmdline) && (*(ptr - 1) != ' '))
 173                 ptr = strstr(ptr, " memsize=");
 174
 175         if (ptr) {
 176                 memsize = memparse(ptr + 8, &ptr);
 177         } else {
 178                 /* otherwise look in the environment */
 179                 memsize_str = prom_getenv("memsize");
 180
 181                 if (memsize_str != NULL) {
 182                         pr_info("prom memsize = %s\n", memsize_str);
 183                         memsize = simple_strtol(memsize_str, NULL, 0);
 184                 }
 185
 186                 if (memsize == 0) {
 187                         if (_prom_memsize != 0) {
 188                                 memsize = _prom_memsize;
 189                                 pr_info("_prom_memsize = 0x%x\n", memsize);
 190                                 /* add in memory that the bootloader doesn't
 191                                  * report */
 192                                 memsize += BLDR_SIZE;
 193                         } else {
 194                                 memsize = DEFAULT_MEMSIZE;
 195                                 pr_info("Memsize not passed by bootloader, "
 196                                         "defaulting to 0x%x\n", memsize);
 197                         }
 198                 }
 199         }
 200
 201         return memsize;
 202 }
 203
 204 /**
 205  * register_low_ram - register an aliased section of RAM
 206  * @p:          Alias address of memory
 207  * @n:          Number of bytes in this section of memory
 208  *
 209  * Returns the number of bytes registered
 210  *
 211  */
 212 static __init phys_addr_t register_low_ram(phys_addr_t p, phys_addr_t n)
 213 {
 214         phys_addr_t s;
 215         int i;
 216         phys_addr_t orig_n;
 217
 218         orig_n = n;
 219
 220         BUG_ON(p + n > RV_PHYS);
 221
 222         for (i = 0; n != 0 && i < ARRAY_SIZE(low_mem_reserved); i++) {
 223                 phys_addr_t start;
 224                 phys_addr_t size;
 225
 226                 start = low_mem_reserved[i].start;
 227                 size = low_mem_reserved[i].size;
 228
 229                 /* Handle memory before this low memory section */
 230                 if (p < start) {
 231                         phys_addr_t s;
 232                         s = min(n, start - p);
 233                         add_memory_region(p, s, BOOT_MEM_RAM);
 234                         p += s;
 235                         n -= s;
 236                 }
 237
 238                 /* Handle the low memory section itself. If it's aliased,
 239                  * we reduce the number of byes left, but if not, the RAM
 240                  * is available elsewhere and we don't reduce the number of
 241                  * bytes remaining. */
 242                 if (p == start) {
 243                         if (low_mem_reserved[i].is_aliased) {
 244                                 s = min(n, size);
 245                                 n -= s;
 246                                 p += s;
 247                         } else
 248                                 p += n;
 249                 }
 250         }
 251
 252         return orig_n - n;
 253 }
 254
 255 /*
 256  * register_ram - register real RAM
 257  * @p:  Address of memory as seen by devices
 258  * @alias:      If the memory is seen at an additional address by the processor,
 259  *              this will be the address, otherwise it is the same as @p.
 260  * @n:          Number of bytes in this section of memory
 261  */
 262 static __init void register_ram(phys_addr_t p, phys_addr_t alias,
 263         phys_addr_t n)
 264 {
 265         /*
 266          * If some or all of this memory has an alias, break it into the
 267          * aliased and non-aliased portion.
 268          */
 269         if (p != alias) {
 270                 phys_addr_t alias_size;
 271                 phys_addr_t registered;
 272
 273                 alias_size = min(n, LOW_RAM_END - alias);
 274                 registered = register_low_ram(alias, alias_size);
 275                 ioremap_add_map(alias, p, n);
 276                 n -= registered;
 277                 p += registered;
 278         }
 279
 280 #ifdef CONFIG_HIGHMEM
 281         if (n != 0) {
 282                 add_memory_region(p, n, BOOT_MEM_RAM);
 283                 ioremap_add_map(p, p, n);
 284         }
 285 #endif
 286 }
 287
 288 /**
 289  * register_address_space - register things in the address space
 290  * @memsize:    Number of bytes of RAM installed
 291  *
 292  * Takes the given number of bytes of RAM and registers as many of the regions,
 293  * or partial regions, as it can. So, the default configuration might have
 294  * two regions with 256 MiB each. If the memsize passed in on the command line
 295  * is 384 MiB, it will register the first region with 256 MiB and the second
 296  * with 128 MiB.
 297  */
 298 static __init void register_address_space(phys_addr_t memsize)
 299 {
 300         int i;
 301         phys_addr_t size;
 302         size_t n;
 303         struct mem_layout *layout;
 304         enum family_type family;
 305
 306         /*
 307          * Register all of the things that aren't available to the kernel as
 308          * memory.
 309          */
 310         register_non_ram();
 311
 312         /* Find the appropriate memory description */
 313         family = platform_get_family();
 314
 315         for (i = 0; i < ARRAY_SIZE(layout_list); i++) {
 316                 if (layout_list[i].family == family)
 317                         break;
 318         }
 319
 320         if (i == ARRAY_SIZE(layout_list)) {
 321                 n = ARRAY_SIZE(default_layout);
 322                 layout = default_layout;
 323         } else {
 324                 n = layout_list[i].n;
 325                 layout = layout_list[i].layout;
 326         }
 327
 328         for (i = 0; memsize != 0 && i < n; i++) {
 329                 size = min(memsize, layout[i].size);
 330                 register_ram(layout[i].phys, layout[i].alias, size);
 331                 memsize -= size;
 332         }
 333 }
 334
 335 void __init prom_meminit(void)
 336 {
 337         ptv_memsize = get_memsize();
 338         register_address_space(ptv_memsize);
 339 }
 340
 341 void __init prom_free_prom_memory(void)
 342 {
 343         unsigned long addr;
 344         int i;
 345
 346         for (i = 0; i < boot_mem_map.nr_map; i++) {
 347                 if (boot_mem_map.map[i].type != BOOT_MEM_ROM_DATA)
 348                         continue;
 349
 350                 addr = boot_mem_map.map[i].addr;
 351                 free_init_pages("prom memory",
 352                                 addr, addr + boot_mem_map.map[i].size);
 353         }
 354 }