ARM: 6214/2: driver for the character LCD found in ARM refdesigns
[linux-2.6.git] / drivers / misc / sgi-xp / xp_uv.c
1 /*
2  * This file is subject to the terms and conditions of the GNU General Public
3  * License.  See the file "COPYING" in the main directory of this archive
4  * for more details.
5  *
6  * Copyright (c) 2008 Silicon Graphics, Inc.  All Rights Reserved.
7  */
8
9 /*
10  * Cross Partition (XP) uv-based functions.
11  *
12  *      Architecture specific implementation of common functions.
13  *
14  */
15
16 #include <linux/device.h>
17 #include <asm/uv/uv_hub.h>
18 #if defined CONFIG_X86_64
19 #include <asm/uv/bios.h>
20 #elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
21 #include <asm/sn/sn_sal.h>
22 #endif
23 #include "../sgi-gru/grukservices.h"
24 #include "xp.h"
25
26 /*
27  * Convert a virtual memory address to a physical memory address.
28  */
29 static unsigned long
30 xp_pa_uv(void *addr)
31 {
32         return uv_gpa(addr);
33 }
34
35 /*
36  * Convert a global physical to socket physical address.
37  */
38 static unsigned long
39 xp_socket_pa_uv(unsigned long gpa)
40 {
41         return uv_gpa_to_soc_phys_ram(gpa);
42 }
43
44 static enum xp_retval
45 xp_remote_mmr_read(unsigned long dst_gpa, const unsigned long src_gpa,
46                    size_t len)
47 {
48         int ret;
49         unsigned long *dst_va = __va(uv_gpa_to_soc_phys_ram(dst_gpa));
50
51         BUG_ON(!uv_gpa_in_mmr_space(src_gpa));
52         BUG_ON(len != 8);
53
54         ret = gru_read_gpa(dst_va, src_gpa);
55         if (ret == 0)
56                 return xpSuccess;
57
58         dev_err(xp, "gru_read_gpa() failed, dst_gpa=0x%016lx src_gpa=0x%016lx "
59                 "len=%ld\n", dst_gpa, src_gpa, len);
60         return xpGruCopyError;
61 }
62
63
64 static enum xp_retval
65 xp_remote_memcpy_uv(unsigned long dst_gpa, const unsigned long src_gpa,
66                     size_t len)
67 {
68         int ret;
69
70         if (uv_gpa_in_mmr_space(src_gpa))
71                 return xp_remote_mmr_read(dst_gpa, src_gpa, len);
72
73         ret = gru_copy_gpa(dst_gpa, src_gpa, len);
74         if (ret == 0)
75                 return xpSuccess;
76
77         dev_err(xp, "gru_copy_gpa() failed, dst_gpa=0x%016lx src_gpa=0x%016lx "
78                 "len=%ld\n", dst_gpa, src_gpa, len);
79         return xpGruCopyError;
80 }
81
82 static int
83 xp_cpu_to_nasid_uv(int cpuid)
84 {
85         /* ??? Is this same as sn2 nasid in mach/part bitmaps set up by SAL? */
86         return UV_PNODE_TO_NASID(uv_cpu_to_pnode(cpuid));
87 }
88
89 static enum xp_retval
90 xp_expand_memprotect_uv(unsigned long phys_addr, unsigned long size)
91 {
92         int ret;
93
94 #if defined CONFIG_X86_64
95         ret = uv_bios_change_memprotect(phys_addr, size, UV_MEMPROT_ALLOW_RW);
96         if (ret != BIOS_STATUS_SUCCESS) {
97                 dev_err(xp, "uv_bios_change_memprotect(,, "
98                         "UV_MEMPROT_ALLOW_RW) failed, ret=%d\n", ret);
99                 return xpBiosError;
100         }
101
102 #elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
103         u64 nasid_array;
104
105         ret = sn_change_memprotect(phys_addr, size, SN_MEMPROT_ACCESS_CLASS_1,
106                                    &nasid_array);
107         if (ret != 0) {
108                 dev_err(xp, "sn_change_memprotect(,, "
109                         "SN_MEMPROT_ACCESS_CLASS_1,) failed ret=%d\n", ret);
110                 return xpSalError;
111         }
112 #else
113         #error not a supported configuration
114 #endif
115         return xpSuccess;
116 }
117
118 static enum xp_retval
119 xp_restrict_memprotect_uv(unsigned long phys_addr, unsigned long size)
120 {
121         int ret;
122
123 #if defined CONFIG_X86_64
124         ret = uv_bios_change_memprotect(phys_addr, size,
125                                         UV_MEMPROT_RESTRICT_ACCESS);
126         if (ret != BIOS_STATUS_SUCCESS) {
127                 dev_err(xp, "uv_bios_change_memprotect(,, "
128                         "UV_MEMPROT_RESTRICT_ACCESS) failed, ret=%d\n", ret);
129                 return xpBiosError;
130         }
131
132 #elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
133         u64 nasid_array;
134
135         ret = sn_change_memprotect(phys_addr, size, SN_MEMPROT_ACCESS_CLASS_0,
136                                    &nasid_array);
137         if (ret != 0) {
138                 dev_err(xp, "sn_change_memprotect(,, "
139                         "SN_MEMPROT_ACCESS_CLASS_0,) failed ret=%d\n", ret);
140                 return xpSalError;
141         }
142 #else
143         #error not a supported configuration
144 #endif
145         return xpSuccess;
146 }
147
148 enum xp_retval
149 xp_init_uv(void)
150 {
151         BUG_ON(!is_uv());
152
153         xp_max_npartitions = XP_MAX_NPARTITIONS_UV;
154         xp_partition_id = sn_partition_id;
155         xp_region_size = sn_region_size;
156
157         xp_pa = xp_pa_uv;
158         xp_socket_pa = xp_socket_pa_uv;
159         xp_remote_memcpy = xp_remote_memcpy_uv;
160         xp_cpu_to_nasid = xp_cpu_to_nasid_uv;
161         xp_expand_memprotect = xp_expand_memprotect_uv;
162         xp_restrict_memprotect = xp_restrict_memprotect_uv;
163
164         return xpSuccess;
165 }
166
167 void
168 xp_exit_uv(void)
169 {
170         BUG_ON(!is_uv());
171 }