arch/x86/platform/uv/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) 2008-2009 Silicon Graphics, Inc.  All Rights Reserved.
  19  *  Copyright (c) Russ Anderson <rja@sgi.com>
  20  */
  21
  22 #include <linux/efi.h>
  23 #include <linux/export.h>
  24 #include <linux/slab.h>
  25 #include <asm/efi.h>
  26 #include <linux/io.h>
  27 #include <asm/uv/bios.h>
  28 #include <asm/uv/uv_hub.h>
  29
  30 struct uv_systab *uv_systab;
  31
  32 s64 uv_bios_call(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3, u64 a4, u64 a5)
  33 {
  34         struct uv_systab *tab = uv_systab;
  35         s64 ret;
  36
  37         if (!tab || !tab->function)
  38                 /*
  39                  * BIOS does not support UV systab
  40                  */
  41                 return BIOS_STATUS_UNIMPLEMENTED;
  42
  43         ret = efi_call((void *)__va(tab->function), (u64)which,
  44                         a1, a2, a3, a4, a5);
  45         return ret;
  46 }
  47 EXPORT_SYMBOL_GPL(uv_bios_call);
  48
  49 s64 uv_bios_call_irqsave(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3,
  50                                         u64 a4, u64 a5)
  51 {
  52         unsigned long bios_flags;
  53         s64 ret;
  54
  55         local_irq_save(bios_flags);
  56         ret = uv_bios_call(which, a1, a2, a3, a4, a5);
  57         local_irq_restore(bios_flags);
  58
  59         return ret;
  60 }
  61
  62 s64 uv_bios_call_reentrant(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3,
  63                                         u64 a4, u64 a5)
  64 {
  65         s64 ret;
  66
  67         preempt_disable();
  68         ret = uv_bios_call(which, a1, a2, a3, a4, a5);
  69         preempt_enable();
  70
  71         return ret;
  72 }
  73
  74
  75 long sn_partition_id;
  76 EXPORT_SYMBOL_GPL(sn_partition_id);
  77 long sn_coherency_id;
  78 EXPORT_SYMBOL_GPL(sn_coherency_id);
  79 long sn_region_size;
  80 EXPORT_SYMBOL_GPL(sn_region_size);
  81 long system_serial_number;
  82 EXPORT_SYMBOL_GPL(system_serial_number);
  83 int uv_type;
  84 EXPORT_SYMBOL_GPL(uv_type);
  85
  86
  87 s64 uv_bios_get_sn_info(int fc, int *uvtype, long *partid, long *coher,
  88                 long *region, long *ssn)
  89 {
  90         s64 ret;
  91         u64 v0, v1;
  92         union partition_info_u part;
  93
  94         ret = uv_bios_call_irqsave(UV_BIOS_GET_SN_INFO, fc,
  95                                 (u64)(&v0), (u64)(&v1), 0, 0);
  96         if (ret != BIOS_STATUS_SUCCESS)
  97                 return ret;
  98
  99         part.val = v0;
 100         if (uvtype)
 101                 *uvtype = part.hub_version;
 102         if (partid)
 103                 *partid = part.partition_id;
 104         if (coher)
 105                 *coher = part.coherence_id;
 106         if (region)
 107                 *region = part.region_size;
 108         if (ssn)
 109                 *ssn = v1;
 110         return ret;
 111 }
 112 EXPORT_SYMBOL_GPL(uv_bios_get_sn_info);
 113
 114 int
 115 uv_bios_mq_watchlist_alloc(unsigned long addr, unsigned int mq_size,
 116                            unsigned long *intr_mmr_offset)
 117 {
 118         u64 watchlist;
 119         s64 ret;
 120
 121         /*
 122          * bios returns watchlist number or negative error number.
 123          */
 124         ret = (int)uv_bios_call_irqsave(UV_BIOS_WATCHLIST_ALLOC, addr,
 125                         mq_size, (u64)intr_mmr_offset,
 126                         (u64)&watchlist, 0);
 127         if (ret < BIOS_STATUS_SUCCESS)
 128                 return ret;
 129
 130         return watchlist;
 131 }
 132 EXPORT_SYMBOL_GPL(uv_bios_mq_watchlist_alloc);
 133
 134 int
 135 uv_bios_mq_watchlist_free(int blade, int watchlist_num)
 136 {
 137         return (int)uv_bios_call_irqsave(UV_BIOS_WATCHLIST_FREE,
 138                                 blade, watchlist_num, 0, 0, 0);
 139 }
 140 EXPORT_SYMBOL_GPL(uv_bios_mq_watchlist_free);
 141
 142 s64
 143 uv_bios_change_memprotect(u64 paddr, u64 len, enum uv_memprotect perms)
 144 {
 145         return uv_bios_call_irqsave(UV_BIOS_MEMPROTECT, paddr, len,
 146                                         perms, 0, 0);
 147 }
 148 EXPORT_SYMBOL_GPL(uv_bios_change_memprotect);
 149
 150 s64
 151 uv_bios_reserved_page_pa(u64 buf, u64 *cookie, u64 *addr, u64 *len)
 152 {
 153         s64 ret;
 154
 155         ret = uv_bios_call_irqsave(UV_BIOS_GET_PARTITION_ADDR, (u64)cookie,
 156                                         (u64)addr, buf, (u64)len, 0);
 157         return ret;
 158 }
 159 EXPORT_SYMBOL_GPL(uv_bios_reserved_page_pa);
 160
 161 s64 uv_bios_freq_base(u64 clock_type, u64 *ticks_per_second)
 162 {
 163         return uv_bios_call(UV_BIOS_FREQ_BASE, clock_type,
 164                            (u64)ticks_per_second, 0, 0, 0);
 165 }
 166 EXPORT_SYMBOL_GPL(uv_bios_freq_base);
 167
 168 /*
 169  * uv_bios_set_legacy_vga_target - Set Legacy VGA I/O Target
 170  * @decode: true to enable target, false to disable target
 171  * @domain: PCI domain number
 172  * @bus: PCI bus number
 173  *
 174  * Returns:
 175  *    0: Success
 176  *    -EINVAL: Invalid domain or bus number
 177  *    -ENOSYS: Capability not available
 178  *    -EBUSY: Legacy VGA I/O cannot be retargeted at this time
 179  */
 180 int uv_bios_set_legacy_vga_target(bool decode, int domain, int bus)
 181 {
 182         return uv_bios_call(UV_BIOS_SET_LEGACY_VGA_TARGET,
 183                                 (u64)decode, (u64)domain, (u64)bus, 0, 0);
 184 }
 185 EXPORT_SYMBOL_GPL(uv_bios_set_legacy_vga_target);
 186
 187 #ifdef CONFIG_EFI
 188 void uv_bios_init(void)
 189 {
 190         uv_systab = NULL;
 191         if ((efi.uv_systab == EFI_INVALID_TABLE_ADDR) || !efi.uv_systab) {
 192                 pr_crit("UV: UVsystab: missing\n");
 193                 return;
 194         }
 195
 196         uv_systab = ioremap(efi.uv_systab, sizeof(struct uv_systab));
 197         if (!uv_systab || strncmp(uv_systab->signature, UV_SYSTAB_SIG, 4)) {
 198                 pr_err("UV: UVsystab: bad signature!\n");
 199                 iounmap(uv_systab);
 200                 return;
 201         }
 202
 203         if (uv_systab->revision >= UV_SYSTAB_VERSION_UV4) {
 204                 iounmap(uv_systab);
 205                 uv_systab = ioremap(efi.uv_systab, uv_systab->size);
 206                 if (!uv_systab) {
 207                         pr_err("UV: UVsystab: ioremap(%d) failed!\n",
 208                                 uv_systab->size);
 209                         return;
 210                 }
 211         }
 212         pr_info("UV: UVsystab: Revision:%x\n", uv_systab->revision);
 213 }
 214 #endif