arch/x86/kernel/bios_uv.c

   1 /*
   2  * BIOS run time interface routines.
   3  *
   4  *  This program is free software; you can redistribute it and/or modify
   5  *  it under the terms of the GNU General Public License as published by
   6  *  the Free Software Foundation; either version 2 of the License, or
   7  *  (at your option) any later version.
   8  *
   9  *  This program is distributed in the hope that it will be useful,
  10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *  GNU General Public License for more details.
  13  *
  14  *  You should have received a copy of the GNU General Public License
  15  *  along with this program; if not, write to the Free Software
  16  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  17  *
  18  *  Copyright (c) 2008 Silicon Graphics, Inc.  All Rights Reserved.
  19  *  Copyright (c) Russ Anderson
  20  */
  21
  22 #include <linux/efi.h>
  23 #include <asm/efi.h>
  24 #include <linux/io.h>
  25 #include <asm/uv/bios.h>
  26 #include <asm/uv/uv_hub.h>
  27
  28 struct uv_systab uv_systab;
  29
  30 s64 uv_bios_call(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3, u64 a4, u64 a5)
  31 {
  32         struct uv_systab *tab = &uv_systab;
  33
  34         if (!tab->function)
  35                 /*
  36                  * BIOS does not support UV systab
  37                  */
  38                 return BIOS_STATUS_UNIMPLEMENTED;
  39
  40         return efi_call6((void *)__va(tab->function),
  41                                         (u64)which, a1, a2, a3, a4, a5);
  42 }
  43
  44 s64 uv_bios_call_irqsave(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3,
  45                                         u64 a4, u64 a5)
  46 {
  47         unsigned long bios_flags;
  48         s64 ret;
  49
  50         local_irq_save(bios_flags);
  51         ret = uv_bios_call(which, a1, a2, a3, a4, a5);
  52         local_irq_restore(bios_flags);
  53
  54         return ret;
  55 }
  56
  57 s64 uv_bios_call_reentrant(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3,
  58                                         u64 a4, u64 a5)
  59 {
  60         s64 ret;
  61
  62         preempt_disable();
  63         ret = uv_bios_call(which, a1, a2, a3, a4, a5);
  64         preempt_enable();
  65
  66         return ret;
  67 }
  68
  69
  70 long sn_partition_id;
  71 EXPORT_SYMBOL_GPL(sn_partition_id);
  72 long uv_coherency_id;
  73 EXPORT_SYMBOL_GPL(uv_coherency_id);
  74 long uv_region_size;
  75 EXPORT_SYMBOL_GPL(uv_region_size);
  76 int uv_type;
  77
  78
  79 s64 uv_bios_get_sn_info(int fc, int *uvtype, long *partid, long *coher,
  80                 long *region)
  81 {
  82         s64 ret;
  83         u64 v0, v1;
  84         union partition_info_u part;
  85
  86         ret = uv_bios_call_irqsave(UV_BIOS_GET_SN_INFO, fc,
  87                                 (u64)(&v0), (u64)(&v1), 0, 0);
  88         if (ret != BIOS_STATUS_SUCCESS)
  89                 return ret;
  90
  91         part.val = v0;
  92         if (uvtype)
  93                 *uvtype = part.hub_version;
  94         if (partid)
  95                 *partid = part.partition_id;
  96         if (coher)
  97                 *coher = part.coherence_id;
  98         if (region)
  99                 *region = part.region_size;
 100         return ret;
 101 }
 102
 103
 104 s64 uv_bios_freq_base(u64 clock_type, u64 *ticks_per_second)
 105 {
 106         return uv_bios_call(UV_BIOS_FREQ_BASE, clock_type,
 107                            (u64)ticks_per_second, 0, 0, 0);
 108 }
 109 EXPORT_SYMBOL_GPL(uv_bios_freq_base);
 110
 111
 112 #ifdef CONFIG_EFI
 113 void uv_bios_init(void)
 114 {
 115         struct uv_systab *tab;
 116
 117         if ((efi.uv_systab == EFI_INVALID_TABLE_ADDR) ||
 118             (efi.uv_systab == (unsigned long)NULL)) {
 119                 printk(KERN_CRIT "No EFI UV System Table.\n");
 120                 uv_systab.function = (unsigned long)NULL;
 121                 return;
 122         }
 123
 124         tab = (struct uv_systab *)ioremap(efi.uv_systab,
 125                                         sizeof(struct uv_systab));
 126         if (strncmp(tab->signature, "UVST", 4) != 0)
 127                 printk(KERN_ERR "bad signature in UV system table!");
 128
 129         /*
 130          * Copy table to permanent spot for later use.
 131          */
 132         memcpy(&uv_systab, tab, sizeof(struct uv_systab));
 133         iounmap(tab);
 134
 135         printk(KERN_INFO "EFI UV System Table Revision %d\n", tab->revision);
 136 }
 137 #else   /* !CONFIG_EFI */
 138
 139 void uv_bios_init(void) { }
 140 #endif
 141