Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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) 2001-2004 Silicon Graphics, Inc. All rights reserved. |
| 7 | */ |
| 8 | |
| 9 | #include <linux/types.h> |
| 10 | #include <asm/sn/sn_sal.h> |
Prarit Bhargava | c13cf37 | 2005-07-06 15:26:51 -0700 | [diff] [blame^] | 11 | #include <asm/sn/pcibr_provider.h> |
Mark Maule | 9b08ebd | 2005-04-25 11:32:16 -0700 | [diff] [blame] | 12 | #include <asm/sn/pcibus_provider_defs.h> |
| 13 | #include <asm/sn/pcidev.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | |
| 15 | int pcibr_invalidate_ate = 0; /* by default don't invalidate ATE on free */ |
| 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, |
| 21 | uint64_t value) |
| 22 | { |
| 23 | |
| 24 | uint64_t *ate = ate_resource->ate; |
| 25 | int index; |
| 26 | int length = 0; |
| 27 | |
| 28 | for (index = start; length < number; index++, length++) |
| 29 | ate[index] = value; |
| 30 | |
| 31 | } |
| 32 | |
| 33 | /* |
| 34 | * find_free_ate: Find the first free ate index starting from the given |
| 35 | * index for the desired consequtive count. |
| 36 | */ |
| 37 | static int find_free_ate(struct ate_resource *ate_resource, int start, |
| 38 | int count) |
| 39 | { |
| 40 | |
| 41 | uint64_t *ate = ate_resource->ate; |
| 42 | int index; |
| 43 | int start_free; |
| 44 | |
| 45 | for (index = start; index < ate_resource->num_ate;) { |
| 46 | if (!ate[index]) { |
| 47 | int i; |
| 48 | int free; |
| 49 | free = 0; |
| 50 | start_free = index; /* Found start free ate */ |
| 51 | for (i = start_free; i < ate_resource->num_ate; i++) { |
| 52 | if (!ate[i]) { /* This is free */ |
| 53 | if (++free == count) |
| 54 | return start_free; |
| 55 | } else { |
| 56 | index = i + 1; |
| 57 | break; |
| 58 | } |
| 59 | } |
| 60 | } else |
| 61 | index++; /* Try next ate */ |
| 62 | } |
| 63 | |
| 64 | return -1; |
| 65 | } |
| 66 | |
| 67 | /* |
| 68 | * free_ate_resource: Free the requested number of ATEs. |
| 69 | */ |
| 70 | static inline void free_ate_resource(struct ate_resource *ate_resource, |
| 71 | int start) |
| 72 | { |
| 73 | |
| 74 | mark_ate(ate_resource, start, ate_resource->ate[start], 0); |
| 75 | if ((ate_resource->lowest_free_index > start) || |
| 76 | (ate_resource->lowest_free_index < 0)) |
| 77 | ate_resource->lowest_free_index = start; |
| 78 | |
| 79 | } |
| 80 | |
| 81 | /* |
| 82 | * alloc_ate_resource: Allocate the requested number of ATEs. |
| 83 | */ |
| 84 | static inline int alloc_ate_resource(struct ate_resource *ate_resource, |
| 85 | int ate_needed) |
| 86 | { |
| 87 | |
| 88 | int start_index; |
| 89 | |
| 90 | /* |
| 91 | * Check for ate exhaustion. |
| 92 | */ |
| 93 | if (ate_resource->lowest_free_index < 0) |
| 94 | return -1; |
| 95 | |
| 96 | /* |
| 97 | * Find the required number of free consequtive ates. |
| 98 | */ |
| 99 | start_index = |
| 100 | find_free_ate(ate_resource, ate_resource->lowest_free_index, |
| 101 | ate_needed); |
| 102 | if (start_index >= 0) |
| 103 | mark_ate(ate_resource, start_index, ate_needed, ate_needed); |
| 104 | |
| 105 | ate_resource->lowest_free_index = |
| 106 | find_free_ate(ate_resource, ate_resource->lowest_free_index, 1); |
| 107 | |
| 108 | return start_index; |
| 109 | } |
| 110 | |
| 111 | /* |
| 112 | * Allocate "count" contiguous Bridge Address Translation Entries |
| 113 | * on the specified bridge to be used for PCI to XTALK mappings. |
| 114 | * Indices in rm map range from 1..num_entries. Indicies returned |
| 115 | * to caller range from 0..num_entries-1. |
| 116 | * |
| 117 | * Return the start index on success, -1 on failure. |
| 118 | */ |
| 119 | int pcibr_ate_alloc(struct pcibus_info *pcibus_info, int count) |
| 120 | { |
| 121 | int status = 0; |
| 122 | uint64_t flag; |
| 123 | |
| 124 | flag = pcibr_lock(pcibus_info); |
| 125 | status = alloc_ate_resource(&pcibus_info->pbi_int_ate_resource, count); |
| 126 | |
| 127 | if (status < 0) { |
| 128 | /* Failed to allocate */ |
| 129 | pcibr_unlock(pcibus_info, flag); |
| 130 | return -1; |
| 131 | } |
| 132 | |
| 133 | pcibr_unlock(pcibus_info, flag); |
| 134 | |
| 135 | return status; |
| 136 | } |
| 137 | |
| 138 | /* |
| 139 | * Setup an Address Translation Entry as specified. Use either the Bridge |
| 140 | * internal maps or the external map RAM, as appropriate. |
| 141 | */ |
| 142 | static inline uint64_t *pcibr_ate_addr(struct pcibus_info *pcibus_info, |
| 143 | int ate_index) |
| 144 | { |
| 145 | if (ate_index < pcibus_info->pbi_int_ate_size) { |
| 146 | return pcireg_int_ate_addr(pcibus_info, ate_index); |
| 147 | } |
| 148 | panic("pcibr_ate_addr: invalid ate_index 0x%x", ate_index); |
| 149 | } |
| 150 | |
| 151 | /* |
| 152 | * Update the ate. |
| 153 | */ |
| 154 | void inline |
| 155 | ate_write(struct pcibus_info *pcibus_info, int ate_index, int count, |
| 156 | volatile uint64_t ate) |
| 157 | { |
| 158 | while (count-- > 0) { |
| 159 | if (ate_index < pcibus_info->pbi_int_ate_size) { |
| 160 | pcireg_int_ate_set(pcibus_info, ate_index, ate); |
| 161 | } else { |
| 162 | panic("ate_write: invalid ate_index 0x%x", ate_index); |
| 163 | } |
| 164 | ate_index++; |
| 165 | ate += IOPGSIZE; |
| 166 | } |
| 167 | |
| 168 | pcireg_tflush_get(pcibus_info); /* wait until Bridge PIO complete */ |
| 169 | } |
| 170 | |
| 171 | void pcibr_ate_free(struct pcibus_info *pcibus_info, int index) |
| 172 | { |
| 173 | |
| 174 | volatile uint64_t ate; |
| 175 | int count; |
| 176 | uint64_t flags; |
| 177 | |
| 178 | if (pcibr_invalidate_ate) { |
| 179 | /* For debugging purposes, clear the valid bit in the ATE */ |
| 180 | ate = *pcibr_ate_addr(pcibus_info, index); |
| 181 | count = pcibus_info->pbi_int_ate_resource.ate[index]; |
| 182 | ate_write(pcibus_info, index, count, (ate & ~PCI32_ATE_V)); |
| 183 | } |
| 184 | |
| 185 | flags = pcibr_lock(pcibus_info); |
| 186 | free_ate_resource(&pcibus_info->pbi_int_ate_resource, index); |
| 187 | pcibr_unlock(pcibus_info, flags); |
| 188 | } |