release/src-rt-6.x.4708/linux/linux-2.6.36/arch/ia64/kernel/sal.c

   1 /*
   2  * System Abstraction Layer (SAL) interface routines.
   3  *
   4  * Copyright (C) 1998, 1999, 2001, 2003 Hewlett-Packard Co
   5  *      David Mosberger-Tang <davidm@hpl.hp.com>
   6  * Copyright (C) 1999 VA Linux Systems
   7  * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/init.h>
  12 #include <linux/module.h>
  13 #include <linux/spinlock.h>
  14 #include <linux/string.h>
  15
  16 #include <asm/delay.h>
  17 #include <asm/page.h>
  18 #include <asm/sal.h>
  19 #include <asm/pal.h>
  20
  21  __cacheline_aligned DEFINE_SPINLOCK(sal_lock);
  22 unsigned long sal_platform_features;
  23
  24 unsigned short sal_revision;
  25 unsigned short sal_version;
  26
  27 #define SAL_MAJOR(x) ((x) >> 8)
  28 #define SAL_MINOR(x) ((x) & 0xff)
  29
  30 static struct {
  31         void *addr;     /* function entry point */
  32         void *gpval;    /* gp value to use */
  33 } pdesc;
  34
  35 static long
  36 default_handler (void)
  37 {
  38         return -1;
  39 }
  40
  41 ia64_sal_handler ia64_sal = (ia64_sal_handler) default_handler;
  42 ia64_sal_desc_ptc_t *ia64_ptc_domain_info;
  43
  44 const char *
  45 ia64_sal_strerror (long status)
  46 {
  47         const char *str;
  48         switch (status) {
  49               case 0: str = "Call completed without error"; break;
  50               case 1: str = "Effect a warm boot of the system to complete "
  51                               "the update"; break;
  52               case -1: str = "Not implemented"; break;
  53               case -2: str = "Invalid argument"; break;
  54               case -3: str = "Call completed with error"; break;
  55               case -4: str = "Virtual address not registered"; break;
  56               case -5: str = "No information available"; break;
  57               case -6: str = "Insufficient space to add the entry"; break;
  58               case -7: str = "Invalid entry_addr value"; break;
  59               case -8: str = "Invalid interrupt vector"; break;
  60               case -9: str = "Requested memory not available"; break;
  61               case -10: str = "Unable to write to the NVM device"; break;
  62               case -11: str = "Invalid partition type specified"; break;
  63               case -12: str = "Invalid NVM_Object id specified"; break;
  64               case -13: str = "NVM_Object already has the maximum number "
  65                                 "of partitions"; break;
  66               case -14: str = "Insufficient space in partition for the "
  67                                 "requested write sub-function"; break;
  68               case -15: str = "Insufficient data buffer space for the "
  69                                 "requested read record sub-function"; break;
  70               case -16: str = "Scratch buffer required for the write/delete "
  71                                 "sub-function"; break;
  72               case -17: str = "Insufficient space in the NVM_Object for the "
  73                                 "requested create sub-function"; break;
  74               case -18: str = "Invalid value specified in the partition_rec "
  75                                 "argument"; break;
  76               case -19: str = "Record oriented I/O not supported for this "
  77                                 "partition"; break;
  78               case -20: str = "Bad format of record to be written or "
  79                                 "required keyword variable not "
  80                                 "specified"; break;
  81               default: str = "Unknown SAL status code"; break;
  82         }
  83         return str;
  84 }
  85
  86 void __init
  87 ia64_sal_handler_init (void *entry_point, void *gpval)
  88 {
  89         /* fill in the SAL procedure descriptor and point ia64_sal to it: */
  90         pdesc.addr = entry_point;
  91         pdesc.gpval = gpval;
  92         ia64_sal = (ia64_sal_handler) &pdesc;
  93 }
  94
  95 static void __init
  96 check_versions (struct ia64_sal_systab *systab)
  97 {
  98         sal_revision = (systab->sal_rev_major << 8) | systab->sal_rev_minor;
  99         sal_version = (systab->sal_b_rev_major << 8) | systab->sal_b_rev_minor;
 100
 101         /* Check for broken firmware */
 102         if ((sal_revision == SAL_VERSION_CODE(49, 29))
 103             && (sal_version == SAL_VERSION_CODE(49, 29)))
 104         {
 105                 /*
 106                  * Old firmware for zx2000 prototypes have this weird version number,
 107                  * reset it to something sane.
 108                  */
 109                 sal_revision = SAL_VERSION_CODE(2, 8);
 110                 sal_version = SAL_VERSION_CODE(0, 0);
 111         }
 112
 113         if (ia64_platform_is("sn2") && (sal_revision == SAL_VERSION_CODE(2, 9)))
 114                 /*
 115                  * SGI Altix has hard-coded version 2.9 in their prom
 116                  * but they actually implement 3.2, so let's fix it here.
 117                  */
 118                 sal_revision = SAL_VERSION_CODE(3, 2);
 119 }
 120
 121 static void __init
 122 sal_desc_entry_point (void *p)
 123 {
 124         struct ia64_sal_desc_entry_point *ep = p;
 125         ia64_pal_handler_init(__va(ep->pal_proc));
 126         ia64_sal_handler_init(__va(ep->sal_proc), __va(ep->gp));
 127 }
 128
 129 #ifdef CONFIG_SMP
 130 static void __init
 131 set_smp_redirect (int flag)
 132 {
 133 #ifndef CONFIG_HOTPLUG_CPU
 134         if (no_int_routing)
 135                 smp_int_redirect &= ~flag;
 136         else
 137                 smp_int_redirect |= flag;
 138 #else
 139         /*
 140          * For CPU Hotplug we dont want to do any chipset supported
 141          * interrupt redirection. The reason is this would require that
 142          * All interrupts be stopped and hard bind the irq to a cpu.
 143          * Later when the interrupt is fired we need to set the redir hint
 144          * on again in the vector. This is cumbersome for something that the
 145          * user mode irq balancer will solve anyways.
 146          */
 147         no_int_routing=1;
 148         smp_int_redirect &= ~flag;
 149 #endif
 150 }
 151 #else
 152 #define set_smp_redirect(flag)  do { } while (0)
 153 #endif
 154
 155 static void __init
 156 sal_desc_platform_feature (void *p)
 157 {
 158         struct ia64_sal_desc_platform_feature *pf = p;
 159         sal_platform_features = pf->feature_mask;
 160
 161         printk(KERN_INFO "SAL Platform features:");
 162         if (!sal_platform_features) {
 163                 printk(" None\n");
 164                 return;
 165         }
 166
 167         if (sal_platform_features & IA64_SAL_PLATFORM_FEATURE_BUS_LOCK)
 168                 printk(" BusLock");
 169         if (sal_platform_features & IA64_SAL_PLATFORM_FEATURE_IRQ_REDIR_HINT) {
 170                 printk(" IRQ_Redirection");
 171                 set_smp_redirect(SMP_IRQ_REDIRECTION);
 172         }
 173         if (sal_platform_features & IA64_SAL_PLATFORM_FEATURE_IPI_REDIR_HINT) {
 174                 printk(" IPI_Redirection");
 175                 set_smp_redirect(SMP_IPI_REDIRECTION);
 176         }
 177         if (sal_platform_features & IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT)
 178                 printk(" ITC_Drift");
 179         printk("\n");
 180 }
 181
 182 #ifdef CONFIG_SMP
 183 static void __init
 184 sal_desc_ap_wakeup (void *p)
 185 {
 186         struct ia64_sal_desc_ap_wakeup *ap = p;
 187
 188         switch (ap->mechanism) {
 189         case IA64_SAL_AP_EXTERNAL_INT:
 190                 ap_wakeup_vector = ap->vector;
 191                 printk(KERN_INFO "SAL: AP wakeup using external interrupt "
 192                                 "vector 0x%lx\n", ap_wakeup_vector);
 193                 break;
 194         default:
 195                 printk(KERN_ERR "SAL: AP wakeup mechanism unsupported!\n");
 196                 break;
 197         }
 198 }
 199
 200 static void __init
 201 chk_nointroute_opt(void)
 202 {
 203         char *cp;
 204
 205         for (cp = boot_command_line; *cp; ) {
 206                 if (memcmp(cp, "nointroute", 10) == 0) {
 207                         no_int_routing = 1;
 208                         printk ("no_int_routing on\n");
 209                         break;
 210                 } else {
 211                         while (*cp != ' ' && *cp)
 212                                 ++cp;
 213                         while (*cp == ' ')
 214                                 ++cp;
 215                 }
 216         }
 217 }
 218
 219 #else
 220 static void __init sal_desc_ap_wakeup(void *p) { }
 221 #endif
 222
 223 /*
 224  * HP rx5670 firmware polls for interrupts during SAL_CACHE_FLUSH by reading
 225  * cr.ivr, but it never writes cr.eoi.  This leaves any interrupt marked as
 226  * "in-service" and masks other interrupts of equal or lower priority.
 227  *
 228  * HP internal defect reports: F1859, F2775, F3031.
 229  */
 230 static int sal_cache_flush_drops_interrupts;
 231
 232 static int __init
 233 force_pal_cache_flush(char *str)
 234 {
 235         sal_cache_flush_drops_interrupts = 1;
 236         return 0;
 237 }
 238 early_param("force_pal_cache_flush", force_pal_cache_flush);
 239
 240 void __init
 241 check_sal_cache_flush (void)
 242 {
 243         unsigned long flags;
 244         int cpu;
 245         u64 vector, cache_type = 3;
 246         struct ia64_sal_retval isrv;
 247
 248         if (sal_cache_flush_drops_interrupts)
 249                 return;
 250
 251         cpu = get_cpu();
 252         local_irq_save(flags);
 253
 254         /*
 255          * Send ourselves a timer interrupt, wait until it's reported, and see
 256          * if SAL_CACHE_FLUSH drops it.
 257          */
 258         platform_send_ipi(cpu, IA64_TIMER_VECTOR, IA64_IPI_DM_INT, 0);
 259
 260         while (!ia64_get_irr(IA64_TIMER_VECTOR))
 261                 cpu_relax();
 262
 263         SAL_CALL(isrv, SAL_CACHE_FLUSH, cache_type, 0, 0, 0, 0, 0, 0);
 264
 265         if (isrv.status)
 266                 printk(KERN_ERR "SAL_CAL_FLUSH failed with %ld\n", isrv.status);
 267
 268         if (ia64_get_irr(IA64_TIMER_VECTOR)) {
 269                 vector = ia64_get_ivr();
 270                 ia64_eoi();
 271                 WARN_ON(vector != IA64_TIMER_VECTOR);
 272         } else {
 273                 sal_cache_flush_drops_interrupts = 1;
 274                 printk(KERN_ERR "SAL: SAL_CACHE_FLUSH drops interrupts; "
 275                         "PAL_CACHE_FLUSH will be used instead\n");
 276                 ia64_eoi();
 277         }
 278
 279         local_irq_restore(flags);
 280         put_cpu();
 281 }
 282
 283 s64
 284 ia64_sal_cache_flush (u64 cache_type)
 285 {
 286         struct ia64_sal_retval isrv;
 287
 288         if (sal_cache_flush_drops_interrupts) {
 289                 unsigned long flags;
 290                 u64 progress;
 291                 s64 rc;
 292
 293                 progress = 0;
 294                 local_irq_save(flags);
 295                 rc = ia64_pal_cache_flush(cache_type,
 296                         PAL_CACHE_FLUSH_INVALIDATE, &progress, NULL);
 297                 local_irq_restore(flags);
 298                 return rc;
 299         }
 300
 301         SAL_CALL(isrv, SAL_CACHE_FLUSH, cache_type, 0, 0, 0, 0, 0, 0);
 302         return isrv.status;
 303 }
 304 EXPORT_SYMBOL_GPL(ia64_sal_cache_flush);
 305
 306 void __init
 307 ia64_sal_init (struct ia64_sal_systab *systab)
 308 {
 309         char *p;
 310         int i;
 311
 312         if (!systab) {
 313                 printk(KERN_WARNING "Hmm, no SAL System Table.\n");
 314                 return;
 315         }
 316
 317         if (strncmp(systab->signature, "SST_", 4) != 0)
 318                 printk(KERN_ERR "bad signature in system table!");
 319
 320         check_versions(systab);
 321 #ifdef CONFIG_SMP
 322         chk_nointroute_opt();
 323 #endif
 324
 325         /* revisions are coded in BCD, so %x does the job for us */
 326         printk(KERN_INFO "SAL %x.%x: %.32s %.32s%sversion %x.%x\n",
 327                         SAL_MAJOR(sal_revision), SAL_MINOR(sal_revision),
 328                         systab->oem_id, systab->product_id,
 329                         systab->product_id[0] ? " " : "",
 330                         SAL_MAJOR(sal_version), SAL_MINOR(sal_version));
 331
 332         p = (char *) (systab + 1);
 333         for (i = 0; i < systab->entry_count; i++) {
 334                 /*
 335                  * The first byte of each entry type contains the type
 336                  * descriptor.
 337                  */
 338                 switch (*p) {
 339                 case SAL_DESC_ENTRY_POINT:
 340                         sal_desc_entry_point(p);
 341                         break;
 342                 case SAL_DESC_PLATFORM_FEATURE:
 343                         sal_desc_platform_feature(p);
 344                         break;
 345                 case SAL_DESC_PTC:
 346                         ia64_ptc_domain_info = (ia64_sal_desc_ptc_t *)p;
 347                         break;
 348                 case SAL_DESC_AP_WAKEUP:
 349                         sal_desc_ap_wakeup(p);
 350                         break;
 351                 }
 352                 p += SAL_DESC_SIZE(*p);
 353         }
 354
 355 }
 356
 357 int
 358 ia64_sal_oemcall(struct ia64_sal_retval *isrvp, u64 oemfunc, u64 arg1,
 359                  u64 arg2, u64 arg3, u64 arg4, u64 arg5, u64 arg6, u64 arg7)
 360 {
 361         if (oemfunc < IA64_SAL_OEMFUNC_MIN || oemfunc > IA64_SAL_OEMFUNC_MAX)
 362                 return -1;
 363         SAL_CALL(*isrvp, oemfunc, arg1, arg2, arg3, arg4, arg5, arg6, arg7);
 364         return 0;
 365 }
 366 EXPORT_SYMBOL(ia64_sal_oemcall);
 367
 368 int
 369 ia64_sal_oemcall_nolock(struct ia64_sal_retval *isrvp, u64 oemfunc, u64 arg1,
 370                         u64 arg2, u64 arg3, u64 arg4, u64 arg5, u64 arg6,
 371                         u64 arg7)
 372 {
 373         if (oemfunc < IA64_SAL_OEMFUNC_MIN || oemfunc > IA64_SAL_OEMFUNC_MAX)
 374                 return -1;
 375         SAL_CALL_NOLOCK(*isrvp, oemfunc, arg1, arg2, arg3, arg4, arg5, arg6,
 376                         arg7);
 377         return 0;
 378 }
 379 EXPORT_SYMBOL(ia64_sal_oemcall_nolock);
 380
 381 int
 382 ia64_sal_oemcall_reentrant(struct ia64_sal_retval *isrvp, u64 oemfunc,
 383                            u64 arg1, u64 arg2, u64 arg3, u64 arg4, u64 arg5,
 384                            u64 arg6, u64 arg7)
 385 {
 386         if (oemfunc < IA64_SAL_OEMFUNC_MIN || oemfunc > IA64_SAL_OEMFUNC_MAX)
 387                 return -1;
 388         SAL_CALL_REENTRANT(*isrvp, oemfunc, arg1, arg2, arg3, arg4, arg5, arg6,
 389                            arg7);
 390         return 0;
 391 }
 392 EXPORT_SYMBOL(ia64_sal_oemcall_reentrant);
 393
 394 long
 395 ia64_sal_freq_base (unsigned long which, unsigned long *ticks_per_second,
 396                     unsigned long *drift_info)
 397 {
 398         struct ia64_sal_retval isrv;
 399
 400         SAL_CALL(isrv, SAL_FREQ_BASE, which, 0, 0, 0, 0, 0, 0);
 401         *ticks_per_second = isrv.v0;
 402         *drift_info = isrv.v1;
 403         return isrv.status;
 404 }
 405 EXPORT_SYMBOL_GPL(ia64_sal_freq_base);