git.oblomov.eu Git - linux-2.6/blob - 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
 114 static void __init
 115 sal_desc_entry_point (void *p)
 116 {
 117         struct ia64_sal_desc_entry_point *ep = p;
 118         ia64_pal_handler_init(__va(ep->pal_proc));
 119         ia64_sal_handler_init(__va(ep->sal_proc), __va(ep->gp));
 120 }
 121
 122 #ifdef CONFIG_SMP
 123 static void __init
 124 set_smp_redirect (int flag)
 125 {
 126 #ifndef CONFIG_HOTPLUG_CPU
 127         if (no_int_routing)
 128                 smp_int_redirect &= ~flag;
 129         else
 130                 smp_int_redirect |= flag;
 131 #else
 132         /*
 133          * For CPU Hotplug we dont want to do any chipset supported
 134          * interrupt redirection. The reason is this would require that
 135          * All interrupts be stopped and hard bind the irq to a cpu.
 136          * Later when the interrupt is fired we need to set the redir hint
 137          * on again in the vector. This is combersome for something that the
 138          * user mode irq balancer will solve anyways.
 139          */
 140         no_int_routing=1;
 141         smp_int_redirect &= ~flag;
 142 #endif
 143 }
 144 #else
 145 #define set_smp_redirect(flag)  do { } while (0)
 146 #endif
 147
 148 static void __init
 149 sal_desc_platform_feature (void *p)
 150 {
 151         struct ia64_sal_desc_platform_feature *pf = p;
 152         sal_platform_features = pf->feature_mask;
 153
 154         printk(KERN_INFO "SAL Platform features:");
 155         if (!sal_platform_features) {
 156                 printk(" None\n");
 157                 return;
 158         }
 159
 160         if (sal_platform_features & IA64_SAL_PLATFORM_FEATURE_BUS_LOCK)
 161                 printk(" BusLock");
 162         if (sal_platform_features & IA64_SAL_PLATFORM_FEATURE_IRQ_REDIR_HINT) {
 163                 printk(" IRQ_Redirection");
 164                 set_smp_redirect(SMP_IRQ_REDIRECTION);
 165         }
 166         if (sal_platform_features & IA64_SAL_PLATFORM_FEATURE_IPI_REDIR_HINT) {
 167                 printk(" IPI_Redirection");
 168                 set_smp_redirect(SMP_IPI_REDIRECTION);
 169         }
 170         if (sal_platform_features & IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT)
 171                 printk(" ITC_Drift");
 172         printk("\n");
 173 }
 174
 175 #ifdef CONFIG_SMP
 176 static void __init
 177 sal_desc_ap_wakeup (void *p)
 178 {
 179         struct ia64_sal_desc_ap_wakeup *ap = p;
 180
 181         switch (ap->mechanism) {
 182         case IA64_SAL_AP_EXTERNAL_INT:
 183                 ap_wakeup_vector = ap->vector;
 184                 printk(KERN_INFO "SAL: AP wakeup using external interrupt "
 185                                 "vector 0x%lx\n", ap_wakeup_vector);
 186                 break;
 187         default:
 188                 printk(KERN_ERR "SAL: AP wakeup mechanism unsupported!\n");
 189                 break;
 190         }
 191 }
 192
 193 static void __init
 194 chk_nointroute_opt(void)
 195 {
 196         char *cp;
 197         extern char saved_command_line[];
 198
 199         for (cp = saved_command_line; *cp; ) {
 200                 if (memcmp(cp, "nointroute", 10) == 0) {
 201                         no_int_routing = 1;
 202                         printk ("no_int_routing on\n");
 203                         break;
 204                 } else {
 205                         while (*cp != ' ' && *cp)
 206                                 ++cp;
 207                         while (*cp == ' ')
 208                                 ++cp;
 209                 }
 210         }
 211 }
 212
 213 #else
 214 static void __init sal_desc_ap_wakeup(void *p) { }
 215 #endif
 216
 217 /*
 218  * HP rx5670 firmware polls for interrupts during SAL_CACHE_FLUSH by reading
 219  * cr.ivr, but it never writes cr.eoi.  This leaves any interrupt marked as
 220  * "in-service" and masks other interrupts of equal or lower priority.
 221  *
 222  * HP internal defect reports: F1859, F2775, F3031.
 223  */
 224 static int sal_cache_flush_drops_interrupts;
 225
 226 static void __init
 227 check_sal_cache_flush (void)
 228 {
 229         unsigned long flags;
 230         int cpu;
 231         u64 vector;
 232
 233         cpu = get_cpu();
 234         local_irq_save(flags);
 235
 236         /*
 237          * Schedule a timer interrupt, wait until it's reported, and see if
 238          * SAL_CACHE_FLUSH drops it.
 239          */
 240         ia64_set_itv(IA64_TIMER_VECTOR);
 241         ia64_set_itm(ia64_get_itc() + 1000);
 242
 243         while (!ia64_get_irr(IA64_TIMER_VECTOR))
 244                 cpu_relax();
 245
 246         ia64_sal_cache_flush(3);
 247
 248         if (ia64_get_irr(IA64_TIMER_VECTOR)) {
 249                 vector = ia64_get_ivr();
 250                 ia64_eoi();
 251                 WARN_ON(vector != IA64_TIMER_VECTOR);
 252         } else {
 253                 sal_cache_flush_drops_interrupts = 1;
 254                 printk(KERN_ERR "SAL: SAL_CACHE_FLUSH drops interrupts; "
 255                         "PAL_CACHE_FLUSH will be used instead\n");
 256                 ia64_eoi();
 257         }
 258
 259         local_irq_restore(flags);
 260         put_cpu();
 261 }
 262
 263 s64
 264 ia64_sal_cache_flush (u64 cache_type)
 265 {
 266         struct ia64_sal_retval isrv;
 267
 268         if (sal_cache_flush_drops_interrupts) {
 269                 unsigned long flags;
 270                 u64 progress;
 271                 s64 rc;
 272
 273                 progress = 0;
 274                 local_irq_save(flags);
 275                 rc = ia64_pal_cache_flush(cache_type,
 276                         PAL_CACHE_FLUSH_INVALIDATE, &progress, NULL);
 277                 local_irq_restore(flags);
 278                 return rc;
 279         }
 280
 281         SAL_CALL(isrv, SAL_CACHE_FLUSH, cache_type, 0, 0, 0, 0, 0, 0);
 282         return isrv.status;
 283 }
 284
 285 void __init
 286 ia64_sal_init (struct ia64_sal_systab *systab)
 287 {
 288         char *p;
 289         int i;
 290
 291         if (!systab) {
 292                 printk(KERN_WARNING "Hmm, no SAL System Table.\n");
 293                 return;
 294         }
 295
 296         if (strncmp(systab->signature, "SST_", 4) != 0)
 297                 printk(KERN_ERR "bad signature in system table!");
 298
 299         check_versions(systab);
 300 #ifdef CONFIG_SMP
 301         chk_nointroute_opt();
 302 #endif
 303
 304         /* revisions are coded in BCD, so %x does the job for us */
 305         printk(KERN_INFO "SAL %x.%x: %.32s %.32s%sversion %x.%x\n",
 306                         SAL_MAJOR(sal_revision), SAL_MINOR(sal_revision),
 307                         systab->oem_id, systab->product_id,
 308                         systab->product_id[0] ? " " : "",
 309                         SAL_MAJOR(sal_version), SAL_MINOR(sal_version));
 310
 311         p = (char *) (systab + 1);
 312         for (i = 0; i < systab->entry_count; i++) {
 313                 /*
 314                  * The first byte of each entry type contains the type
 315                  * descriptor.
 316                  */
 317                 switch (*p) {
 318                 case SAL_DESC_ENTRY_POINT:
 319                         sal_desc_entry_point(p);
 320                         break;
 321                 case SAL_DESC_PLATFORM_FEATURE:
 322                         sal_desc_platform_feature(p);
 323                         break;
 324                 case SAL_DESC_PTC:
 325                         ia64_ptc_domain_info = (ia64_sal_desc_ptc_t *)p;
 326                         break;
 327                 case SAL_DESC_AP_WAKEUP:
 328                         sal_desc_ap_wakeup(p);
 329                         break;
 330                 }
 331                 p += SAL_DESC_SIZE(*p);
 332         }
 333
 334         check_sal_cache_flush();
 335 }
 336
 337 int
 338 ia64_sal_oemcall(struct ia64_sal_retval *isrvp, u64 oemfunc, u64 arg1,
 339                  u64 arg2, u64 arg3, u64 arg4, u64 arg5, u64 arg6, u64 arg7)
 340 {
 341         if (oemfunc < IA64_SAL_OEMFUNC_MIN || oemfunc > IA64_SAL_OEMFUNC_MAX)
 342                 return -1;
 343         SAL_CALL(*isrvp, oemfunc, arg1, arg2, arg3, arg4, arg5, arg6, arg7);
 344         return 0;
 345 }
 346 EXPORT_SYMBOL(ia64_sal_oemcall);
 347
 348 int
 349 ia64_sal_oemcall_nolock(struct ia64_sal_retval *isrvp, u64 oemfunc, u64 arg1,
 350                         u64 arg2, u64 arg3, u64 arg4, u64 arg5, u64 arg6,
 351                         u64 arg7)
 352 {
 353         if (oemfunc < IA64_SAL_OEMFUNC_MIN || oemfunc > IA64_SAL_OEMFUNC_MAX)
 354                 return -1;
 355         SAL_CALL_NOLOCK(*isrvp, oemfunc, arg1, arg2, arg3, arg4, arg5, arg6,
 356                         arg7);
 357         return 0;
 358 }
 359 EXPORT_SYMBOL(ia64_sal_oemcall_nolock);
 360
 361 int
 362 ia64_sal_oemcall_reentrant(struct ia64_sal_retval *isrvp, u64 oemfunc,
 363                            u64 arg1, u64 arg2, u64 arg3, u64 arg4, u64 arg5,
 364                            u64 arg6, u64 arg7)
 365 {
 366         if (oemfunc < IA64_SAL_OEMFUNC_MIN || oemfunc > IA64_SAL_OEMFUNC_MAX)
 367                 return -1;
 368         SAL_CALL_REENTRANT(*isrvp, oemfunc, arg1, arg2, arg3, arg4, arg5, arg6,
 369                            arg7);
 370         return 0;
 371 }
 372 EXPORT_SYMBOL(ia64_sal_oemcall_reentrant);