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/smp.h>
  27
  28 #include <asm/bootinfo.h>
  29 #include <asm/reboot.h>
  30 #include <asm/sibyte/board.h>
  31
  32 #include "cfe_api.h"
  33 #include "cfe_error.h"
  34
  35 /* Max ram addressable in 32-bit segments */
  36 #ifdef CONFIG_MIPS64
  37 #define MAX_RAM_SIZE (~0ULL)
  38 #else
  39 #ifdef CONFIG_HIGHMEM
  40 #ifdef CONFIG_64BIT_PHYS_ADDR
  41 #define MAX_RAM_SIZE (~0ULL)
  42 #else
  43 #define MAX_RAM_SIZE (0xffffffffULL)
  44 #endif
  45 #else
  46 #define MAX_RAM_SIZE (0x1fffffffULL)
  47 #endif
  48 #endif
  49
  50 #define SIBYTE_MAX_MEM_REGIONS 8
  51 phys_t board_mem_region_addrs[SIBYTE_MAX_MEM_REGIONS];
  52 phys_t board_mem_region_sizes[SIBYTE_MAX_MEM_REGIONS];
  53 unsigned int board_mem_region_count;
  54
  55 int cfe_cons_handle;
  56
  57 #ifdef CONFIG_BLK_DEV_INITRD
  58 extern unsigned long initrd_start, initrd_end;
  59 #endif
  60
  61 #ifdef CONFIG_KGDB
  62 extern int kgdb_port;
  63 #endif
  64
  65 static void ATTRIB_NORET cfe_linux_exit(void *arg)
  66 {
  67         int warm = *(int *)arg;
  68
  69         if (smp_processor_id()) {
  70                 static int reboot_smp;
  71
  72                 /* Don't repeat the process from another CPU */
  73                 if (!reboot_smp) {
  74                         /* Get CPU 0 to do the cfe_exit */
  75                         reboot_smp = 1;
  76                         smp_call_function(cfe_linux_exit, arg, 1, 0);
  77                 }
  78         } else {
  79                 printk("Passing control back to CFE...\n");
  80                 cfe_exit(warm, 0);
  81                 printk("cfe_exit returned??\n");
  82         }
  83         while (1);
  84 }
  85
  86 static void ATTRIB_NORET cfe_linux_restart(char *command)
  87 {
  88         static const int zero;
  89
  90         cfe_linux_exit((void *)&zero);
  91 }
  92
  93 static void ATTRIB_NORET cfe_linux_halt(void)
  94 {
  95         static const int one = 1;
  96
  97         cfe_linux_exit((void *)&one);
  98 }
  99
 100 static __init void prom_meminit(void)
 101 {
 102         u64 addr, size, type; /* regardless of 64BIT_PHYS_ADDR */
 103         int mem_flags = 0;
 104         unsigned int idx;
 105         int rd_flag;
 106 #ifdef CONFIG_BLK_DEV_INITRD
 107         unsigned long initrd_pstart;
 108         unsigned long initrd_pend;
 109
 110         initrd_pstart = CPHYSADDR(initrd_start);
 111         initrd_pend = CPHYSADDR(initrd_end);
 112         if (initrd_start &&
 113             ((initrd_pstart > MAX_RAM_SIZE)
 114              || (initrd_pend > MAX_RAM_SIZE))) {
 115                 panic("initrd out of addressable memory");
 116         }
 117
 118 #endif /* INITRD */
 119
 120         for (idx = 0; cfe_enummem(idx, mem_flags, &addr, &size, &type) != CFE_ERR_NOMORE;
 121              idx++) {
 122                 rd_flag = 0;
 123                 if (type == CFE_MI_AVAILABLE) {
 124                         /*
 125                          * See if this block contains (any portion of) the
 126                          * ramdisk
 127                          */
 128 #ifdef CONFIG_BLK_DEV_INITRD
 129                         if (initrd_start) {
 130                                 if ((initrd_pstart > addr) &&
 131                                     (initrd_pstart < (addr + size))) {
 132                                         add_memory_region(addr,
 133                                                           initrd_pstart - addr,
 134                                                           BOOT_MEM_RAM);
 135                                         rd_flag = 1;
 136                                 }
 137                                 if ((initrd_pend > addr) &&
 138                                     (initrd_pend < (addr + size))) {
 139                                         add_memory_region(initrd_pend,
 140                                                 (addr + size) - initrd_pend,
 141                                                  BOOT_MEM_RAM);
 142                                         rd_flag = 1;
 143                                 }
 144                         }
 145 #endif
 146                         if (!rd_flag) {
 147                                 if (addr > MAX_RAM_SIZE)
 148                                         continue;
 149                                 if (addr+size > MAX_RAM_SIZE)
 150                                         size = MAX_RAM_SIZE - (addr+size) + 1;
 151                                 /*
 152                                  * memcpy/__copy_user prefetch, which
 153                                  * will cause a bus error for
 154                                  * KSEG/KUSEG addrs not backed by RAM.
 155                                  * Hence, reserve some padding for the
 156                                  * prefetch distance.
 157                                  */
 158                                 if (size > 512)
 159                                         size -= 512;
 160                                 add_memory_region(addr, size, BOOT_MEM_RAM);
 161                         }
 162                         board_mem_region_addrs[board_mem_region_count] = addr;
 163                         board_mem_region_sizes[board_mem_region_count] = size;
 164                         board_mem_region_count++;
 165                         if (board_mem_region_count ==
 166                             SIBYTE_MAX_MEM_REGIONS) {
 167                                 /*
 168                                  * Too many regions.  Need to configure more
 169                                  */
 170                                 while(1);
 171                         }
 172                 }
 173         }
 174 #ifdef CONFIG_BLK_DEV_INITRD
 175         if (initrd_start) {
 176                 add_memory_region(initrd_pstart, initrd_pend - initrd_pstart,
 177                                   BOOT_MEM_RESERVED);
 178         }
 179 #endif
 180 }
 181
 182 #ifdef CONFIG_BLK_DEV_INITRD
 183 static int __init initrd_setup(char *str)
 184 {
 185         char rdarg[64];
 186         int idx;
 187         char *tmp, *endptr;
 188         unsigned long initrd_size;
 189
 190         /* Make a copy of the initrd argument so we can smash it up here */
 191         for (idx = 0; idx < sizeof(rdarg)-1; idx++) {
 192                 if (!str[idx] || (str[idx] == ' ')) break;
 193                 rdarg[idx] = str[idx];
 194         }
 195
 196         rdarg[idx] = 0;
 197         str = rdarg;
 198
 199         /*
 200          *Initrd location comes in the form "<hex size of ramdisk in bytes>@<location in memory>"
 201          *  e.g. initrd=3abfd@80010000.  This is set up by the loader.
 202          */
 203         for (tmp = str; *tmp != '@'; tmp++) {
 204                 if (!*tmp) {
 205                         goto fail;
 206                 }
 207         }
 208         *tmp = 0;
 209         tmp++;
 210         if (!*tmp) {
 211                 goto fail;
 212         }
 213         initrd_size = simple_strtoul(str, &endptr, 16);
 214         if (*endptr) {
 215                 *(tmp-1) = '@';
 216                 goto fail;
 217         }
 218         *(tmp-1) = '@';
 219         initrd_start = simple_strtoul(tmp, &endptr, 16);
 220         if (*endptr) {
 221                 goto fail;
 222         }
 223         initrd_end = initrd_start + initrd_size;
 224         prom_printf("Found initrd of %lx@%lx\n", initrd_size, initrd_start);
 225         return 1;
 226  fail:
 227         prom_printf("Bad initrd argument.  Disabling initrd\n");
 228         initrd_start = 0;
 229         initrd_end = 0;
 230         return 1;
 231 }
 232
 233 #endif
 234
 235 /*
 236  * prom_init is called just after the cpu type is determined, from setup_arch()
 237  */
 238 void __init prom_init(void)
 239 {
 240         uint64_t cfe_ept, cfe_handle;
 241         unsigned int cfe_eptseal;
 242         int argc = fw_arg0;
 243         char **envp = (char **) fw_arg2;
 244         int *prom_vec = (int *) fw_arg3;
 245 #ifdef CONFIG_KGDB
 246         char *arg;
 247 #endif
 248
 249         _machine_restart   = cfe_linux_restart;
 250         _machine_halt      = cfe_linux_halt;
 251         _machine_power_off = cfe_linux_halt;
 252
 253         /*
 254          * Check if a loader was used; if NOT, the 4 arguments are
 255          * what CFE gives us (handle, 0, EPT and EPTSEAL)
 256          */
 257         if (argc < 0) {
 258                 cfe_handle = (uint64_t)(long)argc;
 259                 cfe_ept = (long)envp;
 260                 cfe_eptseal = (uint32_t)(unsigned long)prom_vec;
 261         } else {
 262                 if ((int32_t)(long)prom_vec < 0) {
 263                         /*
 264                          * Old loader; all it gives us is the handle,
 265                          * so use the "known" entrypoint and assume
 266                          * the seal.
 267                          */
 268                         cfe_handle = (uint64_t)(long)prom_vec;
 269                         cfe_ept = (uint64_t)((int32_t)0x9fc00500);
 270                         cfe_eptseal = CFE_EPTSEAL;
 271                 } else {
 272                         /*
 273                          * Newer loaders bundle the handle/ept/eptseal
 274                          * Note: prom_vec is in the loader's useg
 275                          * which is still alive in the TLB.
 276                          */
 277                         cfe_handle = (uint64_t)((int32_t *)prom_vec)[0];
 278                         cfe_ept = (uint64_t)((int32_t *)prom_vec)[2];
 279                         cfe_eptseal = (unsigned int)((uint32_t *)prom_vec)[3];
 280                 }
 281         }
 282         if (cfe_eptseal != CFE_EPTSEAL) {
 283                 /* too early for panic to do any good */
 284                 prom_printf("CFE's entrypoint seal doesn't match. Spinning.");
 285                 while (1) ;
 286         }
 287         cfe_init(cfe_handle, cfe_ept);
 288         /*
 289          * Get the handle for (at least) prom_putchar, possibly for
 290          * boot console
 291          */
 292         cfe_cons_handle = cfe_getstdhandle(CFE_STDHANDLE_CONSOLE);
 293         if (cfe_getenv("LINUX_CMDLINE", arcs_cmdline, CL_SIZE) < 0) {
 294                 if (argc < 0) {
 295                         /*
 296                          * It's OK for direct boot to not provide a
 297                          *  command line
 298                          */
 299                         strcpy(arcs_cmdline, "root=/dev/ram0 ");
 300 #ifdef CONFIG_SIBYTE_PTSWARM
 301                         strcat(arcs_cmdline, "console=ttyS0,115200 ");
 302 #endif
 303                 } else {
 304                         /* The loader should have set the command line */
 305                         /* too early for panic to do any good */
 306                         prom_printf("LINUX_CMDLINE not defined in cfe.");
 307                         while (1) ;
 308                 }
 309         }
 310
 311 #ifdef CONFIG_KGDB
 312         if ((arg = strstr(arcs_cmdline,"kgdb=duart")) != NULL)
 313                 kgdb_port = (arg[10] == '0') ? 0 : 1;
 314         else
 315                 kgdb_port = 1;
 316 #endif
 317
 318 #ifdef CONFIG_BLK_DEV_INITRD
 319         {
 320                 char *ptr;
 321                 /* Need to find out early whether we've got an initrd.  So scan
 322                    the list looking now */
 323                 for (ptr = arcs_cmdline; *ptr; ptr++) {
 324                         while (*ptr == ' ') {
 325                                 ptr++;
 326                         }
 327                         if (!strncmp(ptr, "initrd=", 7)) {
 328                                 initrd_setup(ptr+7);
 329                                 break;
 330                         } else {
 331                                 while (*ptr && (*ptr != ' ')) {
 332                                         ptr++;
 333                                 }
 334                         }
 335                 }
 336         }
 337 #endif /* CONFIG_BLK_DEV_INITRD */
 338
 339         /* Not sure this is needed, but it's the safe way. */
 340         arcs_cmdline[CL_SIZE-1] = 0;
 341
 342         mips_machgroup = MACH_GROUP_SIBYTE;
 343         prom_meminit();
 344 }
 345
 346 unsigned long __init prom_free_prom_memory(void)
 347 {
 348         /* Not sure what I'm supposed to do here.  Nothing, I think */
 349         return 0;
 350 }
 351
 352 void prom_putchar(char c)
 353 {
 354         int ret;
 355
 356         while ((ret = cfe_write(cfe_cons_handle, &c, 1)) == 0)
 357                 ;
 358 }