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