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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 
uv_bios_call(enum uv_bios_cmd which,u64 a1,u64 a2,u64 a3,u64 a4,u64 a5)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_call((void *)__va(tab->function), (u64)which,
43 			a1, a2, a3, a4, a5);
44 	return ret;
45 }
46 EXPORT_SYMBOL_GPL(uv_bios_call);
47 
uv_bios_call_irqsave(enum uv_bios_cmd which,u64 a1,u64 a2,u64 a3,u64 a4,u64 a5)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 
uv_bios_call_reentrant(enum uv_bios_cmd which,u64 a1,u64 a2,u64 a3,u64 a4,u64 a5)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 
uv_bios_get_sn_info(int fc,int * uvtype,long * partid,long * coher,long * region,long * ssn)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
uv_bios_mq_watchlist_alloc(unsigned long addr,unsigned int mq_size,unsigned long * intr_mmr_offset)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
uv_bios_mq_watchlist_free(int blade,int watchlist_num)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
uv_bios_change_memprotect(u64 paddr,u64 len,enum uv_memprotect perms)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
uv_bios_reserved_page_pa(u64 buf,u64 * cookie,u64 * addr,u64 * len)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 
uv_bios_freq_base(u64 clock_type,u64 * ticks_per_second)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  */
uv_bios_set_legacy_vga_target(bool decode,int domain,int bus)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
uv_bios_init(void)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 
uv_bios_init(void)215 void uv_bios_init(void) { }
216 #endif
217