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   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/config.h>
  10 #include <linux/types.h>
  11 #include <linux/kernel.h>
  12 #include <linux/sched.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/delay.h>
  15 #include <asm/openprom.h>
  16 #include <asm/oplib.h>
  17 #include <asm/system.h>
  18
  19 /* Reset and reboot the machine with the command 'bcommand'. */
  20 void prom_reboot(const char *bcommand)
  21 {
  22         p1275_cmd("boot", P1275_ARG(0, P1275_ARG_IN_STRING) |
  23                   P1275_INOUT(1, 0), bcommand);
  24 }
  25
  26 /* Forth evaluate the expression contained in 'fstring'. */
  27 void prom_feval(const char *fstring)
  28 {
  29         if (!fstring || fstring[0] == 0)
  30                 return;
  31         p1275_cmd("interpret", P1275_ARG(0, P1275_ARG_IN_STRING) |
  32                   P1275_INOUT(1, 1), fstring);
  33 }
  34
  35 /* We want to do this more nicely some day. */
  36 extern void (*prom_palette)(int);
  37
  38 #ifdef CONFIG_SMP
  39 extern void smp_capture(void);
  40 extern void smp_release(void);
  41 #endif
  42
  43 /* Drop into the prom, with the chance to continue with the 'go'
  44  * prom command.
  45  */
  46 void prom_cmdline(void)
  47 {
  48         unsigned long flags;
  49
  50         local_irq_save(flags);
  51
  52         if (!serial_console && prom_palette)
  53                 prom_palette(1);
  54
  55 #ifdef CONFIG_SMP
  56         smp_capture();
  57 #endif
  58
  59         p1275_cmd("enter", P1275_INOUT(0, 0));
  60
  61 #ifdef CONFIG_SMP
  62         smp_release();
  63 #endif
  64
  65         if (!serial_console && prom_palette)
  66                 prom_palette(0);
  67
  68         local_irq_restore(flags);
  69 }
  70
  71 /* Drop into the prom, but completely terminate the program.
  72  * No chance of continuing.
  73  */
  74 void prom_halt(void)
  75 {
  76 again:
  77         p1275_cmd("exit", P1275_INOUT(0, 0));
  78         goto again; /* PROM is out to get me -DaveM */
  79 }
  80
  81 void prom_halt_power_off(void)
  82 {
  83         p1275_cmd("SUNW,power-off", P1275_INOUT(0, 0));
  84
  85         /* if nothing else helps, we just halt */
  86         prom_halt();
  87 }
  88
  89 /* Set prom sync handler to call function 'funcp'. */
  90 void prom_setcallback(callback_func_t funcp)
  91 {
  92         if (!funcp)
  93                 return;
  94         p1275_cmd("set-callback", P1275_ARG(0, P1275_ARG_IN_FUNCTION) |
  95                   P1275_INOUT(1, 1), funcp);
  96 }
  97
  98 /* Get the idprom and stuff it into buffer 'idbuf'.  Returns the
  99  * format type.  'num_bytes' is the number of bytes that your idbuf
 100  * has space for.  Returns 0xff on error.
 101  */
 102 unsigned char prom_get_idprom(char *idbuf, int num_bytes)
 103 {
 104         int len;
 105
 106         len = prom_getproplen(prom_root_node, "idprom");
 107         if ((len >num_bytes) || (len == -1))
 108                 return 0xff;
 109         if (!prom_getproperty(prom_root_node, "idprom", idbuf, num_bytes))
 110                 return idbuf[0];
 111
 112         return 0xff;
 113 }
 114
 115 /* Get the major prom version number. */
 116 int prom_version(void)
 117 {
 118         return PROM_P1275;
 119 }
 120
 121 /* Get the prom plugin-revision. */
 122 int prom_getrev(void)
 123 {
 124         return prom_rev;
 125 }
 126
 127 /* Get the prom firmware print revision. */
 128 int prom_getprev(void)
 129 {
 130         return prom_prev;
 131 }
 132
 133 /* Install Linux trap table so PROM uses that instead of its own. */
 134 void prom_set_trap_table(unsigned long tba)
 135 {
 136         p1275_cmd("SUNW,set-trap-table",
 137                   (P1275_ARG(0, P1275_ARG_IN_64B) |
 138                    P1275_INOUT(1, 0)), tba);
 139 }
 140
 141 void prom_set_trap_table_sun4v(unsigned long tba, unsigned long mmfsa)
 142 {
 143         p1275_cmd("SUNW,set-trap-table",
 144                   (P1275_ARG(0, P1275_ARG_IN_64B) |
 145                    P1275_ARG(1, P1275_ARG_IN_64B) |
 146                    P1275_INOUT(2, 0)), tba, mmfsa);
 147 }
 148
 149 int prom_get_mmu_ihandle(void)
 150 {
 151         int node, ret;
 152
 153         if (prom_mmu_ihandle_cache != 0)
 154                 return prom_mmu_ihandle_cache;
 155
 156         node = prom_finddevice(prom_chosen_path);
 157         ret = prom_getint(node, prom_mmu_name);
 158         if (ret == -1 || ret == 0)
 159                 prom_mmu_ihandle_cache = -1;
 160         else
 161                 prom_mmu_ihandle_cache = ret;
 162
 163         return ret;
 164 }
 165
 166 static int prom_get_memory_ihandle(void)
 167 {
 168         static int memory_ihandle_cache;
 169         int node, ret;
 170
 171         if (memory_ihandle_cache != 0)
 172                 return memory_ihandle_cache;
 173
 174         node = prom_finddevice("/chosen");
 175         ret = prom_getint(node, "memory");
 176         if (ret == -1 || ret == 0)
 177                 memory_ihandle_cache = -1;
 178         else
 179                 memory_ihandle_cache = ret;
 180
 181         return ret;
 182 }
 183
 184 /* Load explicit I/D TLB entries. */
 185 long prom_itlb_load(unsigned long index,
 186                     unsigned long tte_data,
 187                     unsigned long vaddr)
 188 {
 189         return p1275_cmd(prom_callmethod_name,
 190                          (P1275_ARG(0, P1275_ARG_IN_STRING) |
 191                           P1275_ARG(2, P1275_ARG_IN_64B) |
 192                           P1275_ARG(3, P1275_ARG_IN_64B) |
 193                           P1275_INOUT(5, 1)),
 194                          "SUNW,itlb-load",
 195                          prom_get_mmu_ihandle(),
 196                          /* And then our actual args are pushed backwards. */
 197                          vaddr,
 198                          tte_data,
 199                          index);
 200 }
 201
 202 long prom_dtlb_load(unsigned long index,
 203                     unsigned long tte_data,
 204                     unsigned long vaddr)
 205 {
 206         return p1275_cmd(prom_callmethod_name,
 207                          (P1275_ARG(0, P1275_ARG_IN_STRING) |
 208                           P1275_ARG(2, P1275_ARG_IN_64B) |
 209                           P1275_ARG(3, P1275_ARG_IN_64B) |
 210                           P1275_INOUT(5, 1)),
 211                          "SUNW,dtlb-load",
 212                          prom_get_mmu_ihandle(),
 213                          /* And then our actual args are pushed backwards. */
 214                          vaddr,
 215                          tte_data,
 216                          index);
 217 }
 218
 219 int prom_map(int mode, unsigned long size,
 220              unsigned long vaddr, unsigned long paddr)
 221 {
 222         int ret = p1275_cmd(prom_callmethod_name,
 223                             (P1275_ARG(0, P1275_ARG_IN_STRING) |
 224                              P1275_ARG(3, P1275_ARG_IN_64B) |
 225                              P1275_ARG(4, P1275_ARG_IN_64B) |
 226                              P1275_ARG(6, P1275_ARG_IN_64B) |
 227                              P1275_INOUT(7, 1)),
 228                             prom_map_name,
 229                             prom_get_mmu_ihandle(),
 230                             mode,
 231                             size,
 232                             vaddr,
 233                             0,
 234                             paddr);
 235
 236         if (ret == 0)
 237                 ret = -1;
 238         return ret;
 239 }
 240
 241 void prom_unmap(unsigned long size, unsigned long vaddr)
 242 {
 243         p1275_cmd(prom_callmethod_name,
 244                   (P1275_ARG(0, P1275_ARG_IN_STRING) |
 245                    P1275_ARG(2, P1275_ARG_IN_64B) |
 246                    P1275_ARG(3, P1275_ARG_IN_64B) |
 247                    P1275_INOUT(4, 0)),
 248                   prom_unmap_name,
 249                   prom_get_mmu_ihandle(),
 250                   size,
 251                   vaddr);
 252 }
 253
 254 /* Set aside physical memory which is not touched or modified
 255  * across soft resets.
 256  */
 257 unsigned long prom_retain(const char *name,
 258                           unsigned long pa_low, unsigned long pa_high,
 259                           long size, long align)
 260 {
 261         /* XXX I don't think we return multiple values correctly.
 262          * XXX OBP supposedly returns pa_low/pa_high here, how does
 263          * XXX it work?
 264          */
 265
 266         /* If align is zero, the pa_low/pa_high args are passed,
 267          * else they are not.
 268          */
 269         if (align == 0)
 270                 return p1275_cmd("SUNW,retain",
 271                                  (P1275_ARG(0, P1275_ARG_IN_BUF) | P1275_INOUT(5, 2)),
 272                                  name, pa_low, pa_high, size, align);
 273         else
 274                 return p1275_cmd("SUNW,retain",
 275                                  (P1275_ARG(0, P1275_ARG_IN_BUF) | P1275_INOUT(3, 2)),
 276                                  name, size, align);
 277 }
 278
 279 /* Get "Unumber" string for the SIMM at the given
 280  * memory address.  Usually this will be of the form
 281  * "Uxxxx" where xxxx is a decimal number which is
 282  * etched into the motherboard next to the SIMM slot
 283  * in question.
 284  */
 285 int prom_getunumber(int syndrome_code,
 286                     unsigned long phys_addr,
 287                     char *buf, int buflen)
 288 {
 289         return p1275_cmd(prom_callmethod_name,
 290                          (P1275_ARG(0, P1275_ARG_IN_STRING)     |
 291                           P1275_ARG(3, P1275_ARG_OUT_BUF)       |
 292                           P1275_ARG(6, P1275_ARG_IN_64B)        |
 293                           P1275_INOUT(8, 2)),
 294                          "SUNW,get-unumber", prom_get_memory_ihandle(),
 295                          buflen, buf, P1275_SIZE(buflen),
 296                          0, phys_addr, syndrome_code);
 297 }
 298
 299 /* Power management extensions. */
 300 void prom_sleepself(void)
 301 {
 302         p1275_cmd("SUNW,sleep-self", P1275_INOUT(0, 0));
 303 }
 304
 305 int prom_sleepsystem(void)
 306 {
 307         return p1275_cmd("SUNW,sleep-system", P1275_INOUT(0, 1));
 308 }
 309
 310 int prom_wakeupsystem(void)
 311 {
 312         return p1275_cmd("SUNW,wakeup-system", P1275_INOUT(0, 1));
 313 }
 314
 315 #ifdef CONFIG_SMP
 316 void prom_startcpu(int cpunode, unsigned long pc, unsigned long arg)
 317 {
 318         p1275_cmd("SUNW,start-cpu", P1275_INOUT(3, 0), cpunode, pc, arg);
 319 }
 320
 321 void prom_startcpu_cpuid(int cpuid, unsigned long pc, unsigned long arg)
 322 {
 323         p1275_cmd("SUNW,start-cpu-by-cpuid", P1275_INOUT(3, 0),
 324                   cpuid, pc, arg);
 325 }
 326
 327 void prom_stopcpu_cpuid(int cpuid)
 328 {
 329         p1275_cmd("SUNW,stop-cpu-by-cpuid", P1275_INOUT(1, 0),
 330                   cpuid);
 331 }
 332
 333 void prom_stopself(void)
 334 {
 335         p1275_cmd("SUNW,stop-self", P1275_INOUT(0, 0));
 336 }
 337
 338 void prom_idleself(void)
 339 {
 340         p1275_cmd("SUNW,idle-self", P1275_INOUT(0, 0));
 341 }
 342
 343 void prom_resumecpu(int cpunode)
 344 {
 345         p1275_cmd("SUNW,resume-cpu", P1275_INOUT(1, 0), cpunode);
 346 }
 347 #endif