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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", P1275_INOUT(1, 0), tba);
 137 }
 138
 139 int prom_get_mmu_ihandle(void)
 140 {
 141         int node, ret;
 142
 143         if (prom_mmu_ihandle_cache != 0)
 144                 return prom_mmu_ihandle_cache;
 145
 146         node = prom_finddevice(prom_chosen_path);
 147         ret = prom_getint(node, prom_mmu_name);
 148         if (ret == -1 || ret == 0)
 149                 prom_mmu_ihandle_cache = -1;
 150         else
 151                 prom_mmu_ihandle_cache = ret;
 152
 153         return ret;
 154 }
 155
 156 static int prom_get_memory_ihandle(void)
 157 {
 158         static int memory_ihandle_cache;
 159         int node, ret;
 160
 161         if (memory_ihandle_cache != 0)
 162                 return memory_ihandle_cache;
 163
 164         node = prom_finddevice("/chosen");
 165         ret = prom_getint(node, "memory");
 166         if (ret == -1 || ret == 0)
 167                 memory_ihandle_cache = -1;
 168         else
 169                 memory_ihandle_cache = ret;
 170
 171         return ret;
 172 }
 173
 174 /* Load explicit I/D TLB entries. */
 175 long prom_itlb_load(unsigned long index,
 176                     unsigned long tte_data,
 177                     unsigned long vaddr)
 178 {
 179         return p1275_cmd(prom_callmethod_name,
 180                          (P1275_ARG(0, P1275_ARG_IN_STRING) |
 181                           P1275_ARG(2, P1275_ARG_IN_64B) |
 182                           P1275_ARG(3, P1275_ARG_IN_64B) |
 183                           P1275_INOUT(5, 1)),
 184                          "SUNW,itlb-load",
 185                          prom_get_mmu_ihandle(),
 186                          /* And then our actual args are pushed backwards. */
 187                          vaddr,
 188                          tte_data,
 189                          index);
 190 }
 191
 192 long prom_dtlb_load(unsigned long index,
 193                     unsigned long tte_data,
 194                     unsigned long vaddr)
 195 {
 196         return p1275_cmd(prom_callmethod_name,
 197                          (P1275_ARG(0, P1275_ARG_IN_STRING) |
 198                           P1275_ARG(2, P1275_ARG_IN_64B) |
 199                           P1275_ARG(3, P1275_ARG_IN_64B) |
 200                           P1275_INOUT(5, 1)),
 201                          "SUNW,dtlb-load",
 202                          prom_get_mmu_ihandle(),
 203                          /* And then our actual args are pushed backwards. */
 204                          vaddr,
 205                          tte_data,
 206                          index);
 207 }
 208
 209 int prom_map(int mode, unsigned long size,
 210              unsigned long vaddr, unsigned long paddr)
 211 {
 212         int ret = p1275_cmd(prom_callmethod_name,
 213                             (P1275_ARG(0, P1275_ARG_IN_STRING) |
 214                              P1275_ARG(3, P1275_ARG_IN_64B) |
 215                              P1275_ARG(4, P1275_ARG_IN_64B) |
 216                              P1275_ARG(6, P1275_ARG_IN_64B) |
 217                              P1275_INOUT(7, 1)),
 218                             prom_map_name,
 219                             prom_get_mmu_ihandle(),
 220                             mode,
 221                             size,
 222                             vaddr,
 223                             0,
 224                             paddr);
 225
 226         if (ret == 0)
 227                 ret = -1;
 228         return ret;
 229 }
 230
 231 void prom_unmap(unsigned long size, unsigned long vaddr)
 232 {
 233         p1275_cmd(prom_callmethod_name,
 234                   (P1275_ARG(0, P1275_ARG_IN_STRING) |
 235                    P1275_ARG(2, P1275_ARG_IN_64B) |
 236                    P1275_ARG(3, P1275_ARG_IN_64B) |
 237                    P1275_INOUT(4, 0)),
 238                   prom_unmap_name,
 239                   prom_get_mmu_ihandle(),
 240                   size,
 241                   vaddr);
 242 }
 243
 244 /* Set aside physical memory which is not touched or modified
 245  * across soft resets.
 246  */
 247 unsigned long prom_retain(const char *name,
 248                           unsigned long pa_low, unsigned long pa_high,
 249                           long size, long align)
 250 {
 251         /* XXX I don't think we return multiple values correctly.
 252          * XXX OBP supposedly returns pa_low/pa_high here, how does
 253          * XXX it work?
 254          */
 255
 256         /* If align is zero, the pa_low/pa_high args are passed,
 257          * else they are not.
 258          */
 259         if (align == 0)
 260                 return p1275_cmd("SUNW,retain",
 261                                  (P1275_ARG(0, P1275_ARG_IN_BUF) | P1275_INOUT(5, 2)),
 262                                  name, pa_low, pa_high, size, align);
 263         else
 264                 return p1275_cmd("SUNW,retain",
 265                                  (P1275_ARG(0, P1275_ARG_IN_BUF) | P1275_INOUT(3, 2)),
 266                                  name, size, align);
 267 }
 268
 269 /* Get "Unumber" string for the SIMM at the given
 270  * memory address.  Usually this will be of the form
 271  * "Uxxxx" where xxxx is a decimal number which is
 272  * etched into the motherboard next to the SIMM slot
 273  * in question.
 274  */
 275 int prom_getunumber(int syndrome_code,
 276                     unsigned long phys_addr,
 277                     char *buf, int buflen)
 278 {
 279         return p1275_cmd(prom_callmethod_name,
 280                          (P1275_ARG(0, P1275_ARG_IN_STRING)     |
 281                           P1275_ARG(3, P1275_ARG_OUT_BUF)       |
 282                           P1275_ARG(6, P1275_ARG_IN_64B)        |
 283                           P1275_INOUT(8, 2)),
 284                          "SUNW,get-unumber", prom_get_memory_ihandle(),
 285                          buflen, buf, P1275_SIZE(buflen),
 286                          0, phys_addr, syndrome_code);
 287 }
 288
 289 /* Power management extensions. */
 290 void prom_sleepself(void)
 291 {
 292         p1275_cmd("SUNW,sleep-self", P1275_INOUT(0, 0));
 293 }
 294
 295 int prom_sleepsystem(void)
 296 {
 297         return p1275_cmd("SUNW,sleep-system", P1275_INOUT(0, 1));
 298 }
 299
 300 int prom_wakeupsystem(void)
 301 {
 302         return p1275_cmd("SUNW,wakeup-system", P1275_INOUT(0, 1));
 303 }
 304
 305 #ifdef CONFIG_SMP
 306 void prom_startcpu(int cpunode, unsigned long pc, unsigned long o0)
 307 {
 308         p1275_cmd("SUNW,start-cpu", P1275_INOUT(3, 0), cpunode, pc, o0);
 309 }
 310
 311 void prom_stopself(void)
 312 {
 313         p1275_cmd("SUNW,stop-self", P1275_INOUT(0, 0));
 314 }
 315
 316 void prom_idleself(void)
 317 {
 318         p1275_cmd("SUNW,idle-self", P1275_INOUT(0, 0));
 319 }
 320
 321 void prom_resumecpu(int cpunode)
 322 {
 323         p1275_cmd("SUNW,resume-cpu", P1275_INOUT(1, 0), cpunode);
 324 }
 325 #endif