arch/sparc64/prom/misc.c

   1 /* $Id: misc.c,v 1.20 2001/09/21 03:17:07 kanoj Exp $
   2  * misc.c:  Miscellaneous prom functions that don't belong
   3  *          anywhere else.
   4  *
   5  * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
   6  * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   7  */
   8
   9 #include <linux/types.h>
  10 #include <linux/kernel.h>
  11 #include <linux/sched.h>
  12 #include <linux/interrupt.h>
  13 #include <linux/delay.h>
  14 #include <asm/openprom.h>
  15 #include <asm/oplib.h>
  16 #include <asm/system.h>
  17 #include <asm/ldc.h>
  18
  19 int prom_service_exists(const char *service_name)
  20 {
  21         int err = p1275_cmd("test", P1275_ARG(0, P1275_ARG_IN_STRING) |
  22                             P1275_INOUT(1, 1), service_name);
  23
  24         if (err)
  25                 return 0;
  26         return 1;
  27 }
  28
  29 void prom_sun4v_guest_soft_state(void)
  30 {
  31         const char *svc = "SUNW,soft-state-supported";
  32
  33         if (!prom_service_exists(svc))
  34                 return;
  35         p1275_cmd(svc, P1275_INOUT(0, 0));
  36 }
  37
  38 /* Reset and reboot the machine with the command 'bcommand'. */
  39 void prom_reboot(const char *bcommand)
  40 {
  41 #ifdef CONFIG_SUN_LDOMS
  42         if (ldom_domaining_enabled)
  43                 ldom_reboot(bcommand);
  44 #endif
  45         p1275_cmd("boot", P1275_ARG(0, P1275_ARG_IN_STRING) |
  46                   P1275_INOUT(1, 0), bcommand);
  47 }
  48
  49 /* Forth evaluate the expression contained in 'fstring'. */
  50 void prom_feval(const char *fstring)
  51 {
  52         if (!fstring || fstring[0] == 0)
  53                 return;
  54         p1275_cmd("interpret", P1275_ARG(0, P1275_ARG_IN_STRING) |
  55                   P1275_INOUT(1, 1), fstring);
  56 }
  57
  58 #ifdef CONFIG_SMP
  59 extern void smp_capture(void);
  60 extern void smp_release(void);
  61 #endif
  62
  63 /* Drop into the prom, with the chance to continue with the 'go'
  64  * prom command.
  65  */
  66 void prom_cmdline(void)
  67 {
  68         unsigned long flags;
  69
  70         local_irq_save(flags);
  71
  72 #ifdef CONFIG_SMP
  73         smp_capture();
  74 #endif
  75
  76         p1275_cmd("enter", P1275_INOUT(0, 0));
  77
  78 #ifdef CONFIG_SMP
  79         smp_release();
  80 #endif
  81
  82         local_irq_restore(flags);
  83 }
  84
  85 /* Drop into the prom, but completely terminate the program.
  86  * No chance of continuing.
  87  */
  88 void prom_halt(void)
  89 {
  90 #ifdef CONFIG_SUN_LDOMS
  91         if (ldom_domaining_enabled)
  92                 ldom_power_off();
  93 #endif
  94 again:
  95         p1275_cmd("exit", P1275_INOUT(0, 0));
  96         goto again; /* PROM is out to get me -DaveM */
  97 }
  98
  99 void prom_halt_power_off(void)
 100 {
 101 #ifdef CONFIG_SUN_LDOMS
 102         if (ldom_domaining_enabled)
 103                 ldom_power_off();
 104 #endif
 105         p1275_cmd("SUNW,power-off", P1275_INOUT(0, 0));
 106
 107         /* if nothing else helps, we just halt */
 108         prom_halt();
 109 }
 110
 111 /* Set prom sync handler to call function 'funcp'. */
 112 void prom_setcallback(callback_func_t funcp)
 113 {
 114         if (!funcp)
 115                 return;
 116         p1275_cmd("set-callback", P1275_ARG(0, P1275_ARG_IN_FUNCTION) |
 117                   P1275_INOUT(1, 1), funcp);
 118 }
 119
 120 /* Get the idprom and stuff it into buffer 'idbuf'.  Returns the
 121  * format type.  'num_bytes' is the number of bytes that your idbuf
 122  * has space for.  Returns 0xff on error.
 123  */
 124 unsigned char prom_get_idprom(char *idbuf, int num_bytes)
 125 {
 126         int len;
 127
 128         len = prom_getproplen(prom_root_node, "idprom");
 129         if ((len >num_bytes) || (len == -1))
 130                 return 0xff;
 131         if (!prom_getproperty(prom_root_node, "idprom", idbuf, num_bytes))
 132                 return idbuf[0];
 133
 134         return 0xff;
 135 }
 136
 137 int prom_get_mmu_ihandle(void)
 138 {
 139         int node, ret;
 140
 141         if (prom_mmu_ihandle_cache != 0)
 142                 return prom_mmu_ihandle_cache;
 143
 144         node = prom_finddevice(prom_chosen_path);
 145         ret = prom_getint(node, prom_mmu_name);
 146         if (ret == -1 || ret == 0)
 147                 prom_mmu_ihandle_cache = -1;
 148         else
 149                 prom_mmu_ihandle_cache = ret;
 150
 151         return ret;
 152 }
 153
 154 static int prom_get_memory_ihandle(void)
 155 {
 156         static int memory_ihandle_cache;
 157         int node, ret;
 158
 159         if (memory_ihandle_cache != 0)
 160                 return memory_ihandle_cache;
 161
 162         node = prom_finddevice("/chosen");
 163         ret = prom_getint(node, "memory");
 164         if (ret == -1 || ret == 0)
 165                 memory_ihandle_cache = -1;
 166         else
 167                 memory_ihandle_cache = ret;
 168
 169         return ret;
 170 }
 171
 172 /* Load explicit I/D TLB entries. */
 173 long prom_itlb_load(unsigned long index,
 174                     unsigned long tte_data,
 175                     unsigned long vaddr)
 176 {
 177         return p1275_cmd(prom_callmethod_name,
 178                          (P1275_ARG(0, P1275_ARG_IN_STRING) |
 179                           P1275_ARG(2, P1275_ARG_IN_64B) |
 180                           P1275_ARG(3, P1275_ARG_IN_64B) |
 181                           P1275_INOUT(5, 1)),
 182                          "SUNW,itlb-load",
 183                          prom_get_mmu_ihandle(),
 184                          /* And then our actual args are pushed backwards. */
 185                          vaddr,
 186                          tte_data,
 187                          index);
 188 }
 189
 190 long prom_dtlb_load(unsigned long index,
 191                     unsigned long tte_data,
 192                     unsigned long vaddr)
 193 {
 194         return p1275_cmd(prom_callmethod_name,
 195                          (P1275_ARG(0, P1275_ARG_IN_STRING) |
 196                           P1275_ARG(2, P1275_ARG_IN_64B) |
 197                           P1275_ARG(3, P1275_ARG_IN_64B) |
 198                           P1275_INOUT(5, 1)),
 199                          "SUNW,dtlb-load",
 200                          prom_get_mmu_ihandle(),
 201                          /* And then our actual args are pushed backwards. */
 202                          vaddr,
 203                          tte_data,
 204                          index);
 205 }
 206
 207 int prom_map(int mode, unsigned long size,
 208              unsigned long vaddr, unsigned long paddr)
 209 {
 210         int ret = p1275_cmd(prom_callmethod_name,
 211                             (P1275_ARG(0, P1275_ARG_IN_STRING) |
 212                              P1275_ARG(3, P1275_ARG_IN_64B) |
 213                              P1275_ARG(4, P1275_ARG_IN_64B) |
 214                              P1275_ARG(6, P1275_ARG_IN_64B) |
 215                              P1275_INOUT(7, 1)),
 216                             prom_map_name,
 217                             prom_get_mmu_ihandle(),
 218                             mode,
 219                             size,
 220                             vaddr,
 221                             0,
 222                             paddr);
 223
 224         if (ret == 0)
 225                 ret = -1;
 226         return ret;
 227 }
 228
 229 void prom_unmap(unsigned long size, unsigned long vaddr)
 230 {
 231         p1275_cmd(prom_callmethod_name,
 232                   (P1275_ARG(0, P1275_ARG_IN_STRING) |
 233                    P1275_ARG(2, P1275_ARG_IN_64B) |
 234                    P1275_ARG(3, P1275_ARG_IN_64B) |
 235                    P1275_INOUT(4, 0)),
 236                   prom_unmap_name,
 237                   prom_get_mmu_ihandle(),
 238                   size,
 239                   vaddr);
 240 }
 241
 242 /* Set aside physical memory which is not touched or modified
 243  * across soft resets.
 244  */
 245 unsigned long prom_retain(const char *name,
 246                           unsigned long pa_low, unsigned long pa_high,
 247                           long size, long align)
 248 {
 249         /* XXX I don't think we return multiple values correctly.
 250          * XXX OBP supposedly returns pa_low/pa_high here, how does
 251          * XXX it work?
 252          */
 253
 254         /* If align is zero, the pa_low/pa_high args are passed,
 255          * else they are not.
 256          */
 257         if (align == 0)
 258                 return p1275_cmd("SUNW,retain",
 259                                  (P1275_ARG(0, P1275_ARG_IN_BUF) | P1275_INOUT(5, 2)),
 260                                  name, pa_low, pa_high, size, align);
 261         else
 262                 return p1275_cmd("SUNW,retain",
 263                                  (P1275_ARG(0, P1275_ARG_IN_BUF) | P1275_INOUT(3, 2)),
 264                                  name, size, align);
 265 }
 266
 267 /* Get "Unumber" string for the SIMM at the given
 268  * memory address.  Usually this will be of the form
 269  * "Uxxxx" where xxxx is a decimal number which is
 270  * etched into the motherboard next to the SIMM slot
 271  * in question.
 272  */
 273 int prom_getunumber(int syndrome_code,
 274                     unsigned long phys_addr,
 275                     char *buf, int buflen)
 276 {
 277         return p1275_cmd(prom_callmethod_name,
 278                          (P1275_ARG(0, P1275_ARG_IN_STRING)     |
 279                           P1275_ARG(3, P1275_ARG_OUT_BUF)       |
 280                           P1275_ARG(6, P1275_ARG_IN_64B)        |
 281                           P1275_INOUT(8, 2)),
 282                          "SUNW,get-unumber", prom_get_memory_ihandle(),
 283                          buflen, buf, P1275_SIZE(buflen),
 284                          0, phys_addr, syndrome_code);
 285 }
 286
 287 /* Power management extensions. */
 288 void prom_sleepself(void)
 289 {
 290         p1275_cmd("SUNW,sleep-self", P1275_INOUT(0, 0));
 291 }
 292
 293 int prom_sleepsystem(void)
 294 {
 295         return p1275_cmd("SUNW,sleep-system", P1275_INOUT(0, 1));
 296 }
 297
 298 int prom_wakeupsystem(void)
 299 {
 300         return p1275_cmd("SUNW,wakeup-system", P1275_INOUT(0, 1));
 301 }
 302
 303 #ifdef CONFIG_SMP
 304 void prom_startcpu(int cpunode, unsigned long pc, unsigned long arg)
 305 {
 306         p1275_cmd("SUNW,start-cpu", P1275_INOUT(3, 0), cpunode, pc, arg);
 307 }
 308
 309 void prom_startcpu_cpuid(int cpuid, unsigned long pc, unsigned long arg)
 310 {
 311         p1275_cmd("SUNW,start-cpu-by-cpuid", P1275_INOUT(3, 0),
 312                   cpuid, pc, arg);
 313 }
 314
 315 void prom_stopcpu_cpuid(int cpuid)
 316 {
 317         p1275_cmd("SUNW,stop-cpu-by-cpuid", P1275_INOUT(1, 0),
 318                   cpuid);
 319 }
 320
 321 void prom_stopself(void)
 322 {
 323         p1275_cmd("SUNW,stop-self", P1275_INOUT(0, 0));
 324 }
 325
 326 void prom_idleself(void)
 327 {
 328         p1275_cmd("SUNW,idle-self", P1275_INOUT(0, 0));
 329 }
 330
 331 void prom_resumecpu(int cpunode)
 332 {
 333         p1275_cmd("SUNW,resume-cpu", P1275_INOUT(1, 0), cpunode);
 334 }
 335 #endif