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Linux/arch/x86/platform/uv/bios_uv.c

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  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 <asm/efi.h>
 25 #include <linux/io.h>
 26 #include <asm/uv/bios.h>
 27 #include <asm/uv/uv_hub.h>
 28 
 29 static struct uv_systab uv_systab;
 30 
 31 s64 uv_bios_call(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3, u64 a4, u64 a5)
 32 {
 33         struct uv_systab *tab = &uv_systab;
 34         s64 ret;
 35 
 36         if (!tab->function)
 37                 /*
 38                  * BIOS does not support UV systab
 39                  */
 40                 return BIOS_STATUS_UNIMPLEMENTED;
 41 
 42         ret = efi_call6((void *)__va(tab->function), (u64)which,
 43                         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 
187 #ifdef CONFIG_EFI
188 void uv_bios_init(void)
189 {
190         struct uv_systab *tab;
191 
192         if ((efi.uv_systab == EFI_INVALID_TABLE_ADDR) ||
193             (efi.uv_systab == (unsigned long)NULL)) {
194                 printk(KERN_CRIT "No EFI UV System Table.\n");
195                 uv_systab.function = (unsigned long)NULL;
196                 return;
197         }
198 
199         tab = (struct uv_systab *)ioremap(efi.uv_systab,
200                                         sizeof(struct uv_systab));
201         if (strncmp(tab->signature, "UVST", 4) != 0)
202                 printk(KERN_ERR "bad signature in UV system table!");
203 
204         /*
205          * Copy table to permanent spot for later use.
206          */
207         memcpy(&uv_systab, tab, sizeof(struct uv_systab));
208         iounmap(tab);
209 
210         printk(KERN_INFO "EFI UV System Table Revision %d\n",
211                                         uv_systab.revision);
212 }
213 #else   /* !CONFIG_EFI */
214 
215 void uv_bios_init(void) { }
216 #endif
217 

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