Commit | Line | Data |
---|---|---|
1da177e4 LT |
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 | * | |
8ed9b2c7 | 6 | * Copyright (C) 2001-2006 Silicon Graphics, Inc. All rights reserved. |
1da177e4 LT |
7 | */ |
8 | ||
9 | #include <linux/types.h> | |
10 | #include <asm/sn/sn_sal.h> | |
c13cf371 | 11 | #include <asm/sn/pcibr_provider.h> |
9b08ebd1 MM |
12 | #include <asm/sn/pcibus_provider_defs.h> |
13 | #include <asm/sn/pcidev.h> | |
1da177e4 | 14 | |
8ed9b2c7 | 15 | int pcibr_invalidate_ate; /* by default don't invalidate ATE on free */ |
1da177e4 LT |
16 | |
17 | /* | |
18 | * mark_ate: Mark the ate as either free or inuse. | |
19 | */ | |
20 | static void mark_ate(struct ate_resource *ate_resource, int start, int number, | |
53493dcf | 21 | u64 value) |
1da177e4 | 22 | { |
53493dcf | 23 | u64 *ate = ate_resource->ate; |
1da177e4 LT |
24 | int index; |
25 | int length = 0; | |
26 | ||
27 | for (index = start; length < number; index++, length++) | |
28 | ate[index] = value; | |
1da177e4 LT |
29 | } |
30 | ||
31 | /* | |
32 | * find_free_ate: Find the first free ate index starting from the given | |
72fdbdce | 33 | * index for the desired consecutive count. |
1da177e4 LT |
34 | */ |
35 | static int find_free_ate(struct ate_resource *ate_resource, int start, | |
36 | int count) | |
37 | { | |
53493dcf | 38 | u64 *ate = ate_resource->ate; |
1da177e4 LT |
39 | int index; |
40 | int start_free; | |
41 | ||
42 | for (index = start; index < ate_resource->num_ate;) { | |
43 | if (!ate[index]) { | |
44 | int i; | |
45 | int free; | |
46 | free = 0; | |
47 | start_free = index; /* Found start free ate */ | |
48 | for (i = start_free; i < ate_resource->num_ate; i++) { | |
49 | if (!ate[i]) { /* This is free */ | |
50 | if (++free == count) | |
51 | return start_free; | |
52 | } else { | |
53 | index = i + 1; | |
54 | break; | |
55 | } | |
56 | } | |
9b6b9399 JS |
57 | if (i >= ate_resource->num_ate) |
58 | return -1; | |
1da177e4 LT |
59 | } else |
60 | index++; /* Try next ate */ | |
61 | } | |
62 | ||
63 | return -1; | |
64 | } | |
65 | ||
66 | /* | |
67 | * free_ate_resource: Free the requested number of ATEs. | |
68 | */ | |
69 | static inline void free_ate_resource(struct ate_resource *ate_resource, | |
70 | int start) | |
71 | { | |
1da177e4 LT |
72 | mark_ate(ate_resource, start, ate_resource->ate[start], 0); |
73 | if ((ate_resource->lowest_free_index > start) || | |
74 | (ate_resource->lowest_free_index < 0)) | |
75 | ate_resource->lowest_free_index = start; | |
1da177e4 LT |
76 | } |
77 | ||
78 | /* | |
79 | * alloc_ate_resource: Allocate the requested number of ATEs. | |
80 | */ | |
81 | static inline int alloc_ate_resource(struct ate_resource *ate_resource, | |
82 | int ate_needed) | |
83 | { | |
1da177e4 LT |
84 | int start_index; |
85 | ||
86 | /* | |
87 | * Check for ate exhaustion. | |
88 | */ | |
89 | if (ate_resource->lowest_free_index < 0) | |
90 | return -1; | |
91 | ||
92 | /* | |
72fdbdce | 93 | * Find the required number of free consecutive ates. |
1da177e4 LT |
94 | */ |
95 | start_index = | |
96 | find_free_ate(ate_resource, ate_resource->lowest_free_index, | |
97 | ate_needed); | |
98 | if (start_index >= 0) | |
99 | mark_ate(ate_resource, start_index, ate_needed, ate_needed); | |
100 | ||
101 | ate_resource->lowest_free_index = | |
102 | find_free_ate(ate_resource, ate_resource->lowest_free_index, 1); | |
103 | ||
104 | return start_index; | |
105 | } | |
106 | ||
107 | /* | |
108 | * Allocate "count" contiguous Bridge Address Translation Entries | |
109 | * on the specified bridge to be used for PCI to XTALK mappings. | |
72fdbdce | 110 | * Indices in rm map range from 1..num_entries. Indices returned |
1da177e4 LT |
111 | * to caller range from 0..num_entries-1. |
112 | * | |
113 | * Return the start index on success, -1 on failure. | |
114 | */ | |
115 | int pcibr_ate_alloc(struct pcibus_info *pcibus_info, int count) | |
116 | { | |
8ed9b2c7 JS |
117 | int status; |
118 | unsigned long flags; | |
1da177e4 | 119 | |
8ed9b2c7 | 120 | spin_lock_irqsave(&pcibus_info->pbi_lock, flags); |
1da177e4 | 121 | status = alloc_ate_resource(&pcibus_info->pbi_int_ate_resource, count); |
8ed9b2c7 | 122 | spin_unlock_irqrestore(&pcibus_info->pbi_lock, flags); |
1da177e4 LT |
123 | |
124 | return status; | |
125 | } | |
126 | ||
127 | /* | |
128 | * Setup an Address Translation Entry as specified. Use either the Bridge | |
129 | * internal maps or the external map RAM, as appropriate. | |
130 | */ | |
a9f627c9 | 131 | static inline u64 __iomem *pcibr_ate_addr(struct pcibus_info *pcibus_info, |
1da177e4 LT |
132 | int ate_index) |
133 | { | |
134 | if (ate_index < pcibus_info->pbi_int_ate_size) { | |
135 | return pcireg_int_ate_addr(pcibus_info, ate_index); | |
136 | } | |
137 | panic("pcibr_ate_addr: invalid ate_index 0x%x", ate_index); | |
138 | } | |
139 | ||
140 | /* | |
141 | * Update the ate. | |
142 | */ | |
143 | void inline | |
144 | ate_write(struct pcibus_info *pcibus_info, int ate_index, int count, | |
53493dcf | 145 | volatile u64 ate) |
1da177e4 LT |
146 | { |
147 | while (count-- > 0) { | |
148 | if (ate_index < pcibus_info->pbi_int_ate_size) { | |
149 | pcireg_int_ate_set(pcibus_info, ate_index, ate); | |
150 | } else { | |
151 | panic("ate_write: invalid ate_index 0x%x", ate_index); | |
152 | } | |
153 | ate_index++; | |
154 | ate += IOPGSIZE; | |
155 | } | |
156 | ||
157 | pcireg_tflush_get(pcibus_info); /* wait until Bridge PIO complete */ | |
158 | } | |
159 | ||
160 | void pcibr_ate_free(struct pcibus_info *pcibus_info, int index) | |
161 | { | |
162 | ||
53493dcf | 163 | volatile u64 ate; |
1da177e4 | 164 | int count; |
c53421b1 | 165 | unsigned long flags; |
1da177e4 LT |
166 | |
167 | if (pcibr_invalidate_ate) { | |
168 | /* For debugging purposes, clear the valid bit in the ATE */ | |
169 | ate = *pcibr_ate_addr(pcibus_info, index); | |
170 | count = pcibus_info->pbi_int_ate_resource.ate[index]; | |
171 | ate_write(pcibus_info, index, count, (ate & ~PCI32_ATE_V)); | |
172 | } | |
173 | ||
8ed9b2c7 | 174 | spin_lock_irqsave(&pcibus_info->pbi_lock, flags); |
1da177e4 | 175 | free_ate_resource(&pcibus_info->pbi_int_ate_resource, index); |
8ed9b2c7 | 176 | spin_unlock_irqrestore(&pcibus_info->pbi_lock, flags); |
1da177e4 | 177 | } |