LXR linux/arch/x86/platform/uv/bios

   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
  30struct uv_systab *uv_systab;
  31
  32s64 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        /*
  44         * If EFI_OLD_MEMMAP is set, we need to fall back to using our old EFI
  45         * callback method, which uses efi_call() directly, with the kernel page tables:
  46         */
  47        if (unlikely(test_bit(EFI_OLD_MEMMAP, &efi.flags)))
  48                ret = efi_call((void *)__va(tab->function), (u64)which, a1, a2, a3, a4, a5);
  49        else
  50                ret = efi_call_virt_pointer(tab, function, (u64)which, a1, a2, a3, a4, a5);
  51
  52        return ret;
  53}
  54EXPORT_SYMBOL_GPL(uv_bios_call);
  55
  56s64 uv_bios_call_irqsave(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3,
  57                                        u64 a4, u64 a5)
  58{
  59        unsigned long bios_flags;
  60        s64 ret;
  61
  62        local_irq_save(bios_flags);
  63        ret = uv_bios_call(which, a1, a2, a3, a4, a5);
  64        local_irq_restore(bios_flags);
  65
  66        return ret;
  67}
  68
  69s64 uv_bios_call_reentrant(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3,
  70                                        u64 a4, u64 a5)
  71{
  72        s64 ret;
  73
  74        preempt_disable();
  75        ret = uv_bios_call(which, a1, a2, a3, a4, a5);
  76        preempt_enable();
  77
  78        return ret;
  79}
  80
  81
  82long sn_partition_id;
  83EXPORT_SYMBOL_GPL(sn_partition_id);
  84long sn_coherency_id;
  85EXPORT_SYMBOL_GPL(sn_coherency_id);
  86long sn_region_size;
  87EXPORT_SYMBOL_GPL(sn_region_size);
  88long system_serial_number;
  89EXPORT_SYMBOL_GPL(system_serial_number);
  90int uv_type;
  91EXPORT_SYMBOL_GPL(uv_type);
  92
  93
  94s64 uv_bios_get_sn_info(int fc, int *uvtype, long *partid, long *coher,
  95                long *region, long *ssn)
  96{
  97        s64 ret;
  98        u64 v0, v1;
  99        union partition_info_u part;
 100
 101        ret = uv_bios_call_irqsave(UV_BIOS_GET_SN_INFO, fc,
 102                                (u64)(&v0), (u64)(&v1), 0, 0);
 103        if (ret != BIOS_STATUS_SUCCESS)
 104                return ret;
 105
 106        part.val = v0;
 107        if (uvtype)
 108                *uvtype = part.hub_version;
 109        if (partid)
 110                *partid = part.partition_id;
 111        if (coher)
 112                *coher = part.coherence_id;
 113        if (region)
 114                *region = part.region_size;
 115        if (ssn)
 116                *ssn = v1;
 117        return ret;
 118}
 119EXPORT_SYMBOL_GPL(uv_bios_get_sn_info);
 120
 121int
 122uv_bios_mq_watchlist_alloc(unsigned long addr, unsigned int mq_size,
 123                           unsigned long *intr_mmr_offset)
 124{
 125        u64 watchlist;
 126        s64 ret;
 127
 128        /*
 129         * bios returns watchlist number or negative error number.
 130         */
 131        ret = (int)uv_bios_call_irqsave(UV_BIOS_WATCHLIST_ALLOC, addr,
 132                        mq_size, (u64)intr_mmr_offset,
 133                        (u64)&watchlist, 0);
 134        if (ret < BIOS_STATUS_SUCCESS)
 135                return ret;
 136
 137        return watchlist;
 138}
 139EXPORT_SYMBOL_GPL(uv_bios_mq_watchlist_alloc);
 140
 141int
 142uv_bios_mq_watchlist_free(int blade, int watchlist_num)
 143{
 144        return (int)uv_bios_call_irqsave(UV_BIOS_WATCHLIST_FREE,
 145                                blade, watchlist_num, 0, 0, 0);
 146}
 147EXPORT_SYMBOL_GPL(uv_bios_mq_watchlist_free);
 148
 149s64
 150uv_bios_change_memprotect(u64 paddr, u64 len, enum uv_memprotect perms)
 151{
 152        return uv_bios_call_irqsave(UV_BIOS_MEMPROTECT, paddr, len,
 153                                        perms, 0, 0);
 154}
 155EXPORT_SYMBOL_GPL(uv_bios_change_memprotect);
 156
 157s64
 158uv_bios_reserved_page_pa(u64 buf, u64 *cookie, u64 *addr, u64 *len)
 159{
 160        return uv_bios_call_irqsave(UV_BIOS_GET_PARTITION_ADDR, (u64)cookie,
 161                                    (u64)addr, buf, (u64)len, 0);
 162}
 163EXPORT_SYMBOL_GPL(uv_bios_reserved_page_pa);
 164
 165s64 uv_bios_freq_base(u64 clock_type, u64 *ticks_per_second)
 166{
 167        return uv_bios_call(UV_BIOS_FREQ_BASE, clock_type,
 168                           (u64)ticks_per_second, 0, 0, 0);
 169}
 170EXPORT_SYMBOL_GPL(uv_bios_freq_base);
 171
 172/*
 173 * uv_bios_set_legacy_vga_target - Set Legacy VGA I/O Target
 174 * @decode: true to enable target, false to disable target
 175 * @domain: PCI domain number
 176 * @bus: PCI bus number
 177 *
 178 * Returns:
 179 *    0: Success
 180 *    -EINVAL: Invalid domain or bus number
 181 *    -ENOSYS: Capability not available
 182 *    -EBUSY: Legacy VGA I/O cannot be retargeted at this time
 183 */
 184int uv_bios_set_legacy_vga_target(bool decode, int domain, int bus)
 185{
 186        return uv_bios_call(UV_BIOS_SET_LEGACY_VGA_TARGET,
 187                                (u64)decode, (u64)domain, (u64)bus, 0, 0);
 188}
 189EXPORT_SYMBOL_GPL(uv_bios_set_legacy_vga_target);
 190
 191#ifdef CONFIG_EFI
 192void uv_bios_init(void)
 193{
 194        uv_systab = NULL;
 195        if ((efi.uv_systab == EFI_INVALID_TABLE_ADDR) ||
 196            !efi.uv_systab || efi_runtime_disabled()) {
 197                pr_crit("UV: UVsystab: missing\n");
 198                return;
 199        }
 200
 201        uv_systab = ioremap(efi.uv_systab, sizeof(struct uv_systab));
 202        if (!uv_systab || strncmp(uv_systab->signature, UV_SYSTAB_SIG, 4)) {
 203                pr_err("UV: UVsystab: bad signature!\n");
 204                iounmap(uv_systab);
 205                return;
 206        }
 207
 208        /* Starting with UV4 the UV systab size is variable */
 209        if (uv_systab->revision >= UV_SYSTAB_VERSION_UV4) {
 210                int size = uv_systab->size;
 211
 212                iounmap(uv_systab);
 213                uv_systab = ioremap(efi.uv_systab, size);
 214                if (!uv_systab) {
 215                        pr_err("UV: UVsystab: ioremap(%d) failed!\n", size);
 216                        return;
 217                }
 218        }
 219        pr_info("UV: UVsystab: Revision:%x\n", uv_systab->revision);
 220}
 221#endif
 222