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/setup.h>
  31 #include <asm/sibyte/board.h>
  32 #include <asm/smp-ops.h>
  33
  34 #include <asm/fw/cfe/cfe_api.h>
  35 #include <asm/fw/cfe/cfe_error.h>
  36
  37 /* Max ram addressable in 32-bit segments */
  38 #ifdef CONFIG_64BIT
  39 #define MAX_RAM_SIZE (~0ULL)
  40 #else
  41 #ifdef CONFIG_HIGHMEM
  42 #ifdef CONFIG_PHYS_ADDR_T_64BIT
  43 #define MAX_RAM_SIZE (~0ULL)
  44 #else
  45 #define MAX_RAM_SIZE (0xffffffffULL)
  46 #endif
  47 #else
  48 #define MAX_RAM_SIZE (0x1fffffffULL)
  49 #endif
  50 #endif
  51
  52 #define SIBYTE_MAX_MEM_REGIONS 8
  53 phys_addr_t board_mem_region_addrs[SIBYTE_MAX_MEM_REGIONS];
  54 phys_addr_t board_mem_region_sizes[SIBYTE_MAX_MEM_REGIONS];
  55 unsigned int board_mem_region_count;
  56
  57 int cfe_cons_handle;
  58
  59 #ifdef CONFIG_BLK_DEV_INITRD
  60 extern unsigned long initrd_start, initrd_end;
  61 #endif
  62
  63 static void __noreturn cfe_linux_exit(void *arg)
  64 {
  65         int warm = *(int *)arg;
  66
  67         if (smp_processor_id()) {
  68                 static int reboot_smp;
  69
  70                 /* Don't repeat the process from another CPU */
  71                 if (!reboot_smp) {
  72                         /* Get CPU 0 to do the cfe_exit */
  73                         reboot_smp = 1;
  74                         smp_call_function(cfe_linux_exit, arg, 0);
  75                 }
  76         } else {
  77                 printk("Passing control back to CFE...\n");
  78                 cfe_exit(warm, 0);
  79                 printk("cfe_exit returned??\n");
  80         }
  81         while (1);
  82 }
  83
  84 static void __noreturn cfe_linux_restart(char *command)
  85 {
  86         static const int zero;
  87
  88         cfe_linux_exit((void *)&zero);
  89 }
  90
  91 static void __noreturn cfe_linux_halt(void)
  92 {
  93         static const int one = 1;
  94
  95         cfe_linux_exit((void *)&one);
  96 }
  97
  98 static __init void prom_meminit(void)
  99 {
 100         u64 addr, size, type; /* regardless of PHYS_ADDR_T_64BIT */
 101         int mem_flags = 0;
 102         unsigned int idx;
 103         int rd_flag;
 104 #ifdef CONFIG_BLK_DEV_INITRD
 105         unsigned long initrd_pstart;
 106         unsigned long initrd_pend;
 107
 108         initrd_pstart = CPHYSADDR(initrd_start);
 109         initrd_pend = CPHYSADDR(initrd_end);
 110         if (initrd_start &&
 111             ((initrd_pstart > MAX_RAM_SIZE)
 112              || (initrd_pend > MAX_RAM_SIZE))) {
 113                 panic("initrd out of addressable memory");
 114         }
 115
 116 #endif /* INITRD */
 117
 118         for (idx = 0; cfe_enummem(idx, mem_flags, &addr, &size, &type) != CFE_ERR_NOMORE;
 119              idx++) {
 120                 rd_flag = 0;
 121                 if (type == CFE_MI_AVAILABLE) {
 122                         /*
 123                          * See if this block contains (any portion of) the
 124                          * ramdisk
 125                          */
 126 #ifdef CONFIG_BLK_DEV_INITRD
 127                         if (initrd_start) {
 128                                 if ((initrd_pstart > addr) &&
 129                                     (initrd_pstart < (addr + size))) {
 130                                         add_memory_region(addr,
 131                                                           initrd_pstart - addr,
 132                                                           BOOT_MEM_RAM);
 133                                         rd_flag = 1;
 134                                 }
 135                                 if ((initrd_pend > addr) &&
 136                                     (initrd_pend < (addr + size))) {
 137                                         add_memory_region(initrd_pend,
 138                                                 (addr + size) - initrd_pend,
 139                                                  BOOT_MEM_RAM);
 140                                         rd_flag = 1;
 141                                 }
 142                         }
 143 #endif
 144                         if (!rd_flag) {
 145                                 if (addr > MAX_RAM_SIZE)
 146                                         continue;
 147                                 if (addr+size > MAX_RAM_SIZE)
 148                                         size = MAX_RAM_SIZE - (addr+size) + 1;
 149                                 /*
 150                                  * memcpy/__copy_user prefetch, which
 151                                  * will cause a bus error for
 152                                  * KSEG/KUSEG addrs not backed by RAM.
 153                                  * Hence, reserve some padding for the
 154                                  * prefetch distance.
 155                                  */
 156                                 if (size > 512)
 157                                         size -= 512;
 158                                 add_memory_region(addr, size, BOOT_MEM_RAM);
 159                         }
 160                         board_mem_region_addrs[board_mem_region_count] = addr;
 161                         board_mem_region_sizes[board_mem_region_count] = size;
 162                         board_mem_region_count++;
 163                         if (board_mem_region_count ==
 164                             SIBYTE_MAX_MEM_REGIONS) {
 165                                 /*
 166                                  * Too many regions.  Need to configure more
 167                                  */
 168                                 while(1);
 169                         }
 170                 }
 171         }
 172 #ifdef CONFIG_BLK_DEV_INITRD
 173         if (initrd_start) {
 174                 add_memory_region(initrd_pstart, initrd_pend - initrd_pstart,
 175                                   BOOT_MEM_RESERVED);
 176         }
 177 #endif
 178 }
 179
 180 #ifdef CONFIG_BLK_DEV_INITRD
 181 static int __init initrd_setup(char *str)
 182 {
 183         char rdarg[64];
 184         int idx;
 185         char *tmp, *endptr;
 186         unsigned long initrd_size;
 187
 188         /* Make a copy of the initrd argument so we can smash it up here */
 189         for (idx = 0; idx < sizeof(rdarg)-1; idx++) {
 190                 if (!str[idx] || (str[idx] == ' ')) break;
 191                 rdarg[idx] = str[idx];
 192         }
 193
 194         rdarg[idx] = 0;
 195         str = rdarg;
 196
 197         /*
 198          *Initrd location comes in the form "<hex size of ramdisk in bytes>@<location in memory>"
 199          *  e.g. initrd=3abfd@80010000.  This is set up by the loader.
 200          */
 201         for (tmp = str; *tmp != '@'; tmp++) {
 202                 if (!*tmp) {
 203                         goto fail;
 204                 }
 205         }
 206         *tmp = 0;
 207         tmp++;
 208         if (!*tmp) {
 209                 goto fail;
 210         }
 211         initrd_size = simple_strtoul(str, &endptr, 16);
 212         if (*endptr) {
 213                 *(tmp-1) = '@';
 214                 goto fail;
 215         }
 216         *(tmp-1) = '@';
 217         initrd_start = simple_strtoul(tmp, &endptr, 16);
 218         if (*endptr) {
 219                 goto fail;
 220         }
 221         initrd_end = initrd_start + initrd_size;
 222         printk("Found initrd of %lx@%lx\n", initrd_size, initrd_start);
 223         return 1;
 224  fail:
 225         printk("Bad initrd argument.  Disabling initrd\n");
 226         initrd_start = 0;
 227         initrd_end = 0;
 228         return 1;
 229 }
 230
 231 #endif
 232
 233 extern const struct plat_smp_ops sb_smp_ops;
 234 extern const struct plat_smp_ops bcm1480_smp_ops;
 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
 247         _machine_restart   = cfe_linux_restart;
 248         _machine_halt      = cfe_linux_halt;
 249         pm_power_off = cfe_linux_halt;
 250
 251         /*
 252          * Check if a loader was used; if NOT, the 4 arguments are
 253          * what CFE gives us (handle, 0, EPT and EPTSEAL)
 254          */
 255         if (argc < 0) {
 256                 cfe_handle = (uint64_t)(long)argc;
 257                 cfe_ept = (long)envp;
 258                 cfe_eptseal = (uint32_t)(unsigned long)prom_vec;
 259         } else {
 260                 if ((int32_t)(long)prom_vec < 0) {
 261                         /*
 262                          * Old loader; all it gives us is the handle,
 263                          * so use the "known" entrypoint and assume
 264                          * the seal.
 265                          */
 266                         cfe_handle = (uint64_t)(long)prom_vec;
 267                         cfe_ept = (uint64_t)((int32_t)0x9fc00500);
 268                         cfe_eptseal = CFE_EPTSEAL;
 269                 } else {
 270                         /*
 271                          * Newer loaders bundle the handle/ept/eptseal
 272                          * Note: prom_vec is in the loader's useg
 273                          * which is still alive in the TLB.
 274                          */
 275                         cfe_handle = (uint64_t)((int32_t *)prom_vec)[0];
 276                         cfe_ept = (uint64_t)((int32_t *)prom_vec)[2];
 277                         cfe_eptseal = (unsigned int)((uint32_t *)prom_vec)[3];
 278                 }
 279         }
 280         if (cfe_eptseal != CFE_EPTSEAL) {
 281                 /* too early for panic to do any good */
 282                 printk("CFE's entrypoint seal doesn't match. Spinning.");
 283                 while (1) ;
 284         }
 285         cfe_init(cfe_handle, cfe_ept);
 286         /*
 287          * Get the handle for (at least) prom_putchar, possibly for
 288          * boot console
 289          */
 290         cfe_cons_handle = cfe_getstdhandle(CFE_STDHANDLE_CONSOLE);
 291         if (cfe_getenv("LINUX_CMDLINE", arcs_cmdline, COMMAND_LINE_SIZE) < 0) {
 292                 if (argc >= 0) {
 293                         /* The loader should have set the command line */
 294                         /* too early for panic to do any good */
 295                         printk("LINUX_CMDLINE not defined in cfe.");
 296                         while (1) ;
 297                 }
 298         }
 299
 300 #ifdef CONFIG_BLK_DEV_INITRD
 301         {
 302                 char *ptr;
 303                 /* Need to find out early whether we've got an initrd.  So scan
 304                    the list looking now */
 305                 for (ptr = arcs_cmdline; *ptr; ptr++) {
 306                         while (*ptr == ' ') {
 307                                 ptr++;
 308                         }
 309                         if (!strncmp(ptr, "initrd=", 7)) {
 310                                 initrd_setup(ptr+7);
 311                                 break;
 312                         } else {
 313                                 while (*ptr && (*ptr != ' ')) {
 314                                         ptr++;
 315                                 }
 316                         }
 317                 }
 318         }
 319 #endif /* CONFIG_BLK_DEV_INITRD */
 320
 321         /* Not sure this is needed, but it's the safe way. */
 322         arcs_cmdline[COMMAND_LINE_SIZE-1] = 0;
 323
 324         prom_meminit();
 325
 326 #if defined(CONFIG_SIBYTE_BCM112X) || defined(CONFIG_SIBYTE_SB1250)
 327         register_smp_ops(&sb_smp_ops);
 328 #endif
 329 #if defined(CONFIG_SIBYTE_BCM1x55) || defined(CONFIG_SIBYTE_BCM1x80)
 330         register_smp_ops(&bcm1480_smp_ops);
 331 #endif
 332 }
 333
 334 void __init prom_free_prom_memory(void)
 335 {
 336         /* Not sure what I'm supposed to do here.  Nothing, I think */
 337 }
 338
 339 void prom_putchar(char c)
 340 {
 341         int ret;
 342
 343         while ((ret = cfe_write(cfe_cons_handle, &c, 1)) == 0)
 344                 ;
 345 }