arch/mips/sibyte/common/cfe.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/init.h>
  20 #include <linux/kernel.h>
  21 #include <linux/linkage.h>
  22 #include <linux/mm.h>
  23 #include <linux/blkdev.h>
  24 #include <linux/bootmem.h>
  25 #include <linux/pm.h>
  26 #include <linux/smp.h>
  27
  28 #include <asm/bootinfo.h>
  29 #include <asm/reboot.h>
  30 #include <asm/sibyte/board.h>
  31 #include <asm/smp-ops.h>
  32
  33 #include <asm/fw/cfe/cfe_api.h>
  34 #include <asm/fw/cfe/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_PHYS_ADDR_T_64BIT
  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_addr_t board_mem_region_addrs[SIBYTE_MAX_MEM_REGIONS];
  53 phys_addr_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 static void __noreturn cfe_linux_exit(void *arg)
  63 {
  64         int warm = *(int *)arg;
  65
  66         if (smp_processor_id()) {
  67                 static int reboot_smp;
  68
  69                 /* Don't repeat the process from another CPU */
  70                 if (!reboot_smp) {
  71                         /* Get CPU 0 to do the cfe_exit */
  72                         reboot_smp = 1;
  73                         smp_call_function(cfe_linux_exit, arg, 0);
  74                 }
  75         } else {
  76                 printk("Passing control back to CFE...\n");
  77                 cfe_exit(warm, 0);
  78                 printk("cfe_exit returned??\n");
  79         }
  80         while (1);
  81 }
  82
  83 static void __noreturn cfe_linux_restart(char *command)
  84 {
  85         static const int zero;
  86
  87         cfe_linux_exit((void *)&zero);
  88 }
  89
  90 static void __noreturn cfe_linux_halt(void)
  91 {
  92         static const int one = 1;
  93
  94         cfe_linux_exit((void *)&one);
  95 }
  96
  97 static __init void prom_meminit(void)
  98 {
  99         u64 addr, size, type; /* regardless of PHYS_ADDR_T_64BIT */
 100         int mem_flags = 0;
 101         unsigned int idx;
 102         int rd_flag;
 103 #ifdef CONFIG_BLK_DEV_INITRD
 104         unsigned long initrd_pstart;
 105         unsigned long initrd_pend;
 106
 107         initrd_pstart = CPHYSADDR(initrd_start);
 108         initrd_pend = CPHYSADDR(initrd_end);
 109         if (initrd_start &&
 110             ((initrd_pstart > MAX_RAM_SIZE)
 111              || (initrd_pend > MAX_RAM_SIZE))) {
 112                 panic("initrd out of addressable memory");
 113         }
 114
 115 #endif /* INITRD */
 116
 117         for (idx = 0; cfe_enummem(idx, mem_flags, &addr, &size, &type) != CFE_ERR_NOMORE;
 118              idx++) {
 119                 rd_flag = 0;
 120                 if (type == CFE_MI_AVAILABLE) {
 121                         /*
 122                          * See if this block contains (any portion of) the
 123                          * ramdisk
 124                          */
 125 #ifdef CONFIG_BLK_DEV_INITRD
 126                         if (initrd_start) {
 127                                 if ((initrd_pstart > addr) &&
 128                                     (initrd_pstart < (addr + size))) {
 129                                         add_memory_region(addr,
 130                                                           initrd_pstart - addr,
 131                                                           BOOT_MEM_RAM);
 132                                         rd_flag = 1;
 133                                 }
 134                                 if ((initrd_pend > addr) &&
 135                                     (initrd_pend < (addr + size))) {
 136                                         add_memory_region(initrd_pend,
 137                                                 (addr + size) - initrd_pend,
 138                                                  BOOT_MEM_RAM);
 139                                         rd_flag = 1;
 140                                 }
 141                         }
 142 #endif
 143                         if (!rd_flag) {
 144                                 if (addr > MAX_RAM_SIZE)
 145                                         continue;
 146                                 if (addr+size > MAX_RAM_SIZE)
 147                                         size = MAX_RAM_SIZE - (addr+size) + 1;
 148                                 /*
 149                                  * memcpy/__copy_user prefetch, which
 150                                  * will cause a bus error for
 151                                  * KSEG/KUSEG addrs not backed by RAM.
 152                                  * Hence, reserve some padding for the
 153                                  * prefetch distance.
 154                                  */
 155                                 if (size > 512)
 156                                         size -= 512;
 157                                 add_memory_region(addr, size, BOOT_MEM_RAM);
 158                         }
 159                         board_mem_region_addrs[board_mem_region_count] = addr;
 160                         board_mem_region_sizes[board_mem_region_count] = size;
 161                         board_mem_region_count++;
 162                         if (board_mem_region_count ==
 163                             SIBYTE_MAX_MEM_REGIONS) {
 164                                 /*
 165                                  * Too many regions.  Need to configure more
 166                                  */
 167                                 while(1);
 168                         }
 169                 }
 170         }
 171 #ifdef CONFIG_BLK_DEV_INITRD
 172         if (initrd_start) {
 173                 add_memory_region(initrd_pstart, initrd_pend - initrd_pstart,
 174                                   BOOT_MEM_RESERVED);
 175         }
 176 #endif
 177 }
 178
 179 #ifdef CONFIG_BLK_DEV_INITRD
 180 static int __init initrd_setup(char *str)
 181 {
 182         char rdarg[64];
 183         int idx;
 184         char *tmp, *endptr;
 185         unsigned long initrd_size;
 186
 187         /* Make a copy of the initrd argument so we can smash it up here */
 188         for (idx = 0; idx < sizeof(rdarg)-1; idx++) {
 189                 if (!str[idx] || (str[idx] == ' ')) break;
 190                 rdarg[idx] = str[idx];
 191         }
 192
 193         rdarg[idx] = 0;
 194         str = rdarg;
 195
 196         /*
 197          *Initrd location comes in the form "<hex size of ramdisk in bytes>@<location in memory>"
 198          *  e.g. initrd=3abfd@80010000.  This is set up by the loader.
 199          */
 200         for (tmp = str; *tmp != '@'; tmp++) {
 201                 if (!*tmp) {
 202                         goto fail;
 203                 }
 204         }
 205         *tmp = 0;
 206         tmp++;
 207         if (!*tmp) {
 208                 goto fail;
 209         }
 210         initrd_size = simple_strtoul(str, &endptr, 16);
 211         if (*endptr) {
 212                 *(tmp-1) = '@';
 213                 goto fail;
 214         }
 215         *(tmp-1) = '@';
 216         initrd_start = simple_strtoul(tmp, &endptr, 16);
 217         if (*endptr) {
 218                 goto fail;
 219         }
 220         initrd_end = initrd_start + initrd_size;
 221         printk("Found initrd of %lx@%lx\n", initrd_size, initrd_start);
 222         return 1;
 223  fail:
 224         printk("Bad initrd argument.  Disabling initrd\n");
 225         initrd_start = 0;
 226         initrd_end = 0;
 227         return 1;
 228 }
 229
 230 #endif
 231
 232 extern struct plat_smp_ops sb_smp_ops;
 233 extern struct plat_smp_ops bcm1480_smp_ops;
 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
 246         _machine_restart   = cfe_linux_restart;
 247         _machine_halt      = cfe_linux_halt;
 248         pm_power_off = cfe_linux_halt;
 249
 250         /*
 251          * Check if a loader was used; if NOT, the 4 arguments are
 252          * what CFE gives us (handle, 0, EPT and EPTSEAL)
 253          */
 254         if (argc < 0) {
 255                 cfe_handle = (uint64_t)(long)argc;
 256                 cfe_ept = (long)envp;
 257                 cfe_eptseal = (uint32_t)(unsigned long)prom_vec;
 258         } else {
 259                 if ((int32_t)(long)prom_vec < 0) {
 260                         /*
 261                          * Old loader; all it gives us is the handle,
 262                          * so use the "known" entrypoint and assume
 263                          * the seal.
 264                          */
 265                         cfe_handle = (uint64_t)(long)prom_vec;
 266                         cfe_ept = (uint64_t)((int32_t)0x9fc00500);
 267                         cfe_eptseal = CFE_EPTSEAL;
 268                 } else {
 269                         /*
 270                          * Newer loaders bundle the handle/ept/eptseal
 271                          * Note: prom_vec is in the loader's useg
 272                          * which is still alive in the TLB.
 273                          */
 274                         cfe_handle = (uint64_t)((int32_t *)prom_vec)[0];
 275                         cfe_ept = (uint64_t)((int32_t *)prom_vec)[2];
 276                         cfe_eptseal = (unsigned int)((uint32_t *)prom_vec)[3];
 277                 }
 278         }
 279         if (cfe_eptseal != CFE_EPTSEAL) {
 280                 /* too early for panic to do any good */
 281                 printk("CFE's entrypoint seal doesn't match. Spinning.");
 282                 while (1) ;
 283         }
 284         cfe_init(cfe_handle, cfe_ept);
 285         /*
 286          * Get the handle for (at least) prom_putchar, possibly for
 287          * boot console
 288          */
 289         cfe_cons_handle = cfe_getstdhandle(CFE_STDHANDLE_CONSOLE);
 290         if (cfe_getenv("LINUX_CMDLINE", arcs_cmdline, COMMAND_LINE_SIZE) < 0) {
 291                 if (argc >= 0) {
 292                         /* The loader should have set the command line */
 293                         /* too early for panic to do any good */
 294                         printk("LINUX_CMDLINE not defined in cfe.");
 295                         while (1) ;
 296                 }
 297         }
 298
 299 #ifdef CONFIG_BLK_DEV_INITRD
 300         {
 301                 char *ptr;
 302                 /* Need to find out early whether we've got an initrd.  So scan
 303                    the list looking now */
 304                 for (ptr = arcs_cmdline; *ptr; ptr++) {
 305                         while (*ptr == ' ') {
 306                                 ptr++;
 307                         }
 308                         if (!strncmp(ptr, "initrd=", 7)) {
 309                                 initrd_setup(ptr+7);
 310                                 break;
 311                         } else {
 312                                 while (*ptr && (*ptr != ' ')) {
 313                                         ptr++;
 314                                 }
 315                         }
 316                 }
 317         }
 318 #endif /* CONFIG_BLK_DEV_INITRD */
 319
 320         /* Not sure this is needed, but it's the safe way. */
 321         arcs_cmdline[COMMAND_LINE_SIZE-1] = 0;
 322
 323         prom_meminit();
 324
 325 #if defined(CONFIG_SIBYTE_BCM112X) || defined(CONFIG_SIBYTE_SB1250)
 326         register_smp_ops(&sb_smp_ops);
 327 #endif
 328 #if defined(CONFIG_SIBYTE_BCM1x55) || defined(CONFIG_SIBYTE_BCM1x80)
 329         register_smp_ops(&bcm1480_smp_ops);
 330 #endif
 331 }
 332
 333 void __init prom_free_prom_memory(void)
 334 {
 335         /* Not sure what I'm supposed to do here.  Nothing, I think */
 336 }
 337
 338 void prom_putchar(char c)
 339 {
 340         int ret;
 341
 342         while ((ret = cfe_write(cfe_cons_handle, &c, 1)) == 0)
 343                 ;
 344 }