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