arch/mips/sibyte/cfe/setup.c

   1 /*
   2  * Copyright (C) 2000, 2001, 2002, 2003 Broadcom Corporation
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version 2
   7  * of the License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  17  */
  18
  19 #include <linux/config.h>
  20 #include <linux/init.h>
  21 #include <linux/kernel.h>
  22 #include <linux/linkage.h>
  23 #include <linux/mm.h>
  24 #include <linux/blkdev.h>
  25 #include <linux/bootmem.h>
  26 #include <linux/pm.h>
  27 #include <linux/smp.h>
  28
  29 #include <asm/bootinfo.h>
  30 #include <asm/reboot.h>
  31 #include <asm/sibyte/board.h>
  32
  33 #include "cfe_api.h"
  34 #include "cfe_error.h"
  35
  36 /* Max ram addressable in 32-bit segments */
  37 #ifdef CONFIG_64BIT
  38 #define MAX_RAM_SIZE (~0ULL)
  39 #else
  40 #ifdef CONFIG_HIGHMEM
  41 #ifdef CONFIG_64BIT_PHYS_ADDR
  42 #define MAX_RAM_SIZE (~0ULL)
  43 #else
  44 #define MAX_RAM_SIZE (0xffffffffULL)
  45 #endif
  46 #else
  47 #define MAX_RAM_SIZE (0x1fffffffULL)
  48 #endif
  49 #endif
  50
  51 #define SIBYTE_MAX_MEM_REGIONS 8
  52 phys_t board_mem_region_addrs[SIBYTE_MAX_MEM_REGIONS];
  53 phys_t board_mem_region_sizes[SIBYTE_MAX_MEM_REGIONS];
  54 unsigned int board_mem_region_count;
  55
  56 int cfe_cons_handle;
  57
  58 #ifdef CONFIG_BLK_DEV_INITRD
  59 extern unsigned long initrd_start, initrd_end;
  60 #endif
  61
  62 #ifdef CONFIG_KGDB
  63 extern int kgdb_port;
  64 #endif
  65
  66 static void ATTRIB_NORET cfe_linux_exit(void *arg)
  67 {
  68         int warm = *(int *)arg;
  69
  70         if (smp_processor_id()) {
  71                 static int reboot_smp;
  72
  73                 /* Don't repeat the process from another CPU */
  74                 if (!reboot_smp) {
  75                         /* Get CPU 0 to do the cfe_exit */
  76                         reboot_smp = 1;
  77                         smp_call_function(cfe_linux_exit, arg, 1, 0);
  78                 }
  79         } else {
  80                 printk("Passing control back to CFE...\n");
  81                 cfe_exit(warm, 0);
  82                 printk("cfe_exit returned??\n");
  83         }
  84         while (1);
  85 }
  86
  87 static void ATTRIB_NORET cfe_linux_restart(char *command)
  88 {
  89         static const int zero;
  90
  91         cfe_linux_exit((void *)&zero);
  92 }
  93
  94 static void ATTRIB_NORET cfe_linux_halt(void)
  95 {
  96         static const int one = 1;
  97
  98         cfe_linux_exit((void *)&one);
  99 }
 100
 101 static __init void prom_meminit(void)
 102 {
 103         u64 addr, size, type; /* regardless of 64BIT_PHYS_ADDR */
 104         int mem_flags = 0;
 105         unsigned int idx;
 106         int rd_flag;
 107 #ifdef CONFIG_BLK_DEV_INITRD
 108         unsigned long initrd_pstart;
 109         unsigned long initrd_pend;
 110
 111         initrd_pstart = CPHYSADDR(initrd_start);
 112         initrd_pend = CPHYSADDR(initrd_end);
 113         if (initrd_start &&
 114             ((initrd_pstart > MAX_RAM_SIZE)
 115              || (initrd_pend > MAX_RAM_SIZE))) {
 116                 panic("initrd out of addressable memory");
 117         }
 118
 119 #endif /* INITRD */
 120
 121         for (idx = 0; cfe_enummem(idx, mem_flags, &addr, &size, &type) != CFE_ERR_NOMORE;
 122              idx++) {
 123                 rd_flag = 0;
 124                 if (type == CFE_MI_AVAILABLE) {
 125                         /*
 126                          * See if this block contains (any portion of) the
 127                          * ramdisk
 128                          */
 129 #ifdef CONFIG_BLK_DEV_INITRD
 130                         if (initrd_start) {
 131                                 if ((initrd_pstart > addr) &&
 132                                     (initrd_pstart < (addr + size))) {
 133                                         add_memory_region(addr,
 134                                                           initrd_pstart - addr,
 135                                                           BOOT_MEM_RAM);
 136                                         rd_flag = 1;
 137                                 }
 138                                 if ((initrd_pend > addr) &&
 139                                     (initrd_pend < (addr + size))) {
 140                                         add_memory_region(initrd_pend,
 141                                                 (addr + size) - initrd_pend,
 142                                                  BOOT_MEM_RAM);
 143                                         rd_flag = 1;
 144                                 }
 145                         }
 146 #endif
 147                         if (!rd_flag) {
 148                                 if (addr > MAX_RAM_SIZE)
 149                                         continue;
 150                                 if (addr+size > MAX_RAM_SIZE)
 151                                         size = MAX_RAM_SIZE - (addr+size) + 1;
 152                                 /*
 153                                  * memcpy/__copy_user prefetch, which
 154                                  * will cause a bus error for
 155                                  * KSEG/KUSEG addrs not backed by RAM.
 156                                  * Hence, reserve some padding for the
 157                                  * prefetch distance.
 158                                  */
 159                                 if (size > 512)
 160                                         size -= 512;
 161                                 add_memory_region(addr, size, BOOT_MEM_RAM);
 162                         }
 163                         board_mem_region_addrs[board_mem_region_count] = addr;
 164                         board_mem_region_sizes[board_mem_region_count] = size;
 165                         board_mem_region_count++;
 166                         if (board_mem_region_count ==
 167                             SIBYTE_MAX_MEM_REGIONS) {
 168                                 /*
 169                                  * Too many regions.  Need to configure more
 170                                  */
 171                                 while(1);
 172                         }
 173                 }
 174         }
 175 #ifdef CONFIG_BLK_DEV_INITRD
 176         if (initrd_start) {
 177                 add_memory_region(initrd_pstart, initrd_pend - initrd_pstart,
 178                                   BOOT_MEM_RESERVED);
 179         }
 180 #endif
 181 }
 182
 183 #ifdef CONFIG_BLK_DEV_INITRD
 184 static int __init initrd_setup(char *str)
 185 {
 186         char rdarg[64];
 187         int idx;
 188         char *tmp, *endptr;
 189         unsigned long initrd_size;
 190
 191         /* Make a copy of the initrd argument so we can smash it up here */
 192         for (idx = 0; idx < sizeof(rdarg)-1; idx++) {
 193                 if (!str[idx] || (str[idx] == ' ')) break;
 194                 rdarg[idx] = str[idx];
 195         }
 196
 197         rdarg[idx] = 0;
 198         str = rdarg;
 199
 200         /*
 201          *Initrd location comes in the form "<hex size of ramdisk in bytes>@<location in memory>"
 202          *  e.g. initrd=3abfd@80010000.  This is set up by the loader.
 203          */
 204         for (tmp = str; *tmp != '@'; tmp++) {
 205                 if (!*tmp) {
 206                         goto fail;
 207                 }
 208         }
 209         *tmp = 0;
 210         tmp++;
 211         if (!*tmp) {
 212                 goto fail;
 213         }
 214         initrd_size = simple_strtoul(str, &endptr, 16);
 215         if (*endptr) {
 216                 *(tmp-1) = '@';
 217                 goto fail;
 218         }
 219         *(tmp-1) = '@';
 220         initrd_start = simple_strtoul(tmp, &endptr, 16);
 221         if (*endptr) {
 222                 goto fail;
 223         }
 224         initrd_end = initrd_start + initrd_size;
 225         prom_printf("Found initrd of %lx@%lx\n", initrd_size, initrd_start);
 226         return 1;
 227  fail:
 228         prom_printf("Bad initrd argument.  Disabling initrd\n");
 229         initrd_start = 0;
 230         initrd_end = 0;
 231         return 1;
 232 }
 233
 234 #endif
 235
 236 /*
 237  * prom_init is called just after the cpu type is determined, from setup_arch()
 238  */
 239 void __init prom_init(void)
 240 {
 241         uint64_t cfe_ept, cfe_handle;
 242         unsigned int cfe_eptseal;
 243         int argc = fw_arg0;
 244         char **envp = (char **) fw_arg2;
 245         int *prom_vec = (int *) fw_arg3;
 246 #ifdef CONFIG_KGDB
 247         char *arg;
 248 #endif
 249
 250         _machine_restart   = cfe_linux_restart;
 251         _machine_halt      = cfe_linux_halt;
 252         pm_power_off = cfe_linux_halt;
 253
 254         /*
 255          * Check if a loader was used; if NOT, the 4 arguments are
 256          * what CFE gives us (handle, 0, EPT and EPTSEAL)
 257          */
 258         if (argc < 0) {
 259                 cfe_handle = (uint64_t)(long)argc;
 260                 cfe_ept = (long)envp;
 261                 cfe_eptseal = (uint32_t)(unsigned long)prom_vec;
 262         } else {
 263                 if ((int32_t)(long)prom_vec < 0) {
 264                         /*
 265                          * Old loader; all it gives us is the handle,
 266                          * so use the "known" entrypoint and assume
 267                          * the seal.
 268                          */
 269                         cfe_handle = (uint64_t)(long)prom_vec;
 270                         cfe_ept = (uint64_t)((int32_t)0x9fc00500);
 271                         cfe_eptseal = CFE_EPTSEAL;
 272                 } else {
 273                         /*
 274                          * Newer loaders bundle the handle/ept/eptseal
 275                          * Note: prom_vec is in the loader's useg
 276                          * which is still alive in the TLB.
 277                          */
 278                         cfe_handle = (uint64_t)((int32_t *)prom_vec)[0];
 279                         cfe_ept = (uint64_t)((int32_t *)prom_vec)[2];
 280                         cfe_eptseal = (unsigned int)((uint32_t *)prom_vec)[3];
 281                 }
 282         }
 283         if (cfe_eptseal != CFE_EPTSEAL) {
 284                 /* too early for panic to do any good */
 285                 prom_printf("CFE's entrypoint seal doesn't match. Spinning.");
 286                 while (1) ;
 287         }
 288         cfe_init(cfe_handle, cfe_ept);
 289         /*
 290          * Get the handle for (at least) prom_putchar, possibly for
 291          * boot console
 292          */
 293         cfe_cons_handle = cfe_getstdhandle(CFE_STDHANDLE_CONSOLE);
 294         if (cfe_getenv("LINUX_CMDLINE", arcs_cmdline, CL_SIZE) < 0) {
 295                 if (argc < 0) {
 296                         /*
 297                          * It's OK for direct boot to not provide a
 298                          *  command line
 299                          */
 300                         strcpy(arcs_cmdline, "root=/dev/ram0 ");
 301 #ifdef CONFIG_SIBYTE_PTSWARM
 302                         strcat(arcs_cmdline, "console=ttyS0,115200 ");
 303 #endif
 304                 } else {
 305                         /* The loader should have set the command line */
 306                         /* too early for panic to do any good */
 307                         prom_printf("LINUX_CMDLINE not defined in cfe.");
 308                         while (1) ;
 309                 }
 310         }
 311
 312 #ifdef CONFIG_KGDB
 313         if ((arg = strstr(arcs_cmdline,"kgdb=duart")) != NULL)
 314                 kgdb_port = (arg[10] == '0') ? 0 : 1;
 315         else
 316                 kgdb_port = 1;
 317 #endif
 318
 319 #ifdef CONFIG_BLK_DEV_INITRD
 320         {
 321                 char *ptr;
 322                 /* Need to find out early whether we've got an initrd.  So scan
 323                    the list looking now */
 324                 for (ptr = arcs_cmdline; *ptr; ptr++) {
 325                         while (*ptr == ' ') {
 326                                 ptr++;
 327                         }
 328                         if (!strncmp(ptr, "initrd=", 7)) {
 329                                 initrd_setup(ptr+7);
 330                                 break;
 331                         } else {
 332                                 while (*ptr && (*ptr != ' ')) {
 333                                         ptr++;
 334                                 }
 335                         }
 336                 }
 337         }
 338 #endif /* CONFIG_BLK_DEV_INITRD */
 339
 340         /* Not sure this is needed, but it's the safe way. */
 341         arcs_cmdline[CL_SIZE-1] = 0;
 342
 343         mips_machgroup = MACH_GROUP_SIBYTE;
 344         prom_meminit();
 345 }
 346
 347 unsigned long __init prom_free_prom_memory(void)
 348 {
 349         /* Not sure what I'm supposed to do here.  Nothing, I think */
 350         return 0;
 351 }
 352
 353 void prom_putchar(char c)
 354 {
 355         int ret;
 356
 357         while ((ret = cfe_write(cfe_cons_handle, &c, 1)) == 0)
 358                 ;
 359 }