/* * csr1212.c -- IEEE 1212 Control and Status Register support for Linux * * Copyright (C) 2003 Francois Retief <fgretief@sun.ac.za> * Steve Kinneberg <kinnebergsteve@acmsystems.com> * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ /* TODO List: * - Verify interface consistency: i.e., public functions that take a size * parameter expect size to be in bytes. */ #include <linux/errno.h> #include <linux/kernel.h> #include <linux/string.h> #include <asm/bug.h> #include <asm/byteorder.h> #include "csr1212.h" /* Permitted key type for each key id */ #define __I (1 << CSR1212_KV_TYPE_IMMEDIATE) #define __C (1 << CSR1212_KV_TYPE_CSR_OFFSET) #define __D (1 << CSR1212_KV_TYPE_DIRECTORY) #define __L (1 << CSR1212_KV_TYPE_LEAF) static const u8 csr1212_key_id_type_map[0x30] = { __C, /* used by Apple iSight */ __D | __L, /* Descriptor */ __I | __D | __L, /* Bus_Dependent_Info */ __I | __D | __L, /* Vendor */ __I, /* Hardware_Version */ 0, 0, /* Reserved */ __D | __L | __I, /* Module */ __I, 0, 0, 0, /* used by Apple iSight, Reserved */ __I, /* Node_Capabilities */ __L, /* EUI_64 */ 0, 0, 0, /* Reserved */ __D, /* Unit */ __I, /* Specifier_ID */ __I, /* Version */ __I | __C | __D | __L, /* Dependent_Info */ __L, /* Unit_Location */ 0, /* Reserved */ __I, /* Model */ __D, /* Instance */ __L, /* Keyword */ __D, /* Feature */ __L, /* Extended_ROM */ __I, /* Extended_Key_Specifier_ID */ __I, /* Extended_Key */ __I | __C | __D | __L, /* Extended_Data */ __L, /* Modifiable_Descriptor */ __I, /* Directory_ID */ __I, /* Revision */ }; #undef __I #undef __C #undef __D #undef __L #define quads_to_bytes(_q) ((_q) * sizeof(u32)) #define bytes_to_quads(_b) (((_b) + sizeof(u32) - 1) / sizeof(u32)) static void free_keyval(struct csr1212_keyval *kv) { if ((kv->key.type == CSR1212_KV_TYPE_LEAF) && (kv->key.id != CSR1212_KV_ID_EXTENDED_ROM)) CSR1212_FREE(kv->value.leaf.data); CSR1212_FREE(kv); } static u16 csr1212_crc16(const u32 *buffer, size_t length) { int shift; u32 data; u16 sum, crc = 0; for (; length; length--) { data = be32_to_cpu(*buffer); buffer++; for (shift = 28; shift >= 0; shift -= 4 ) { sum = ((crc >> 12) ^ (data >> shift)) & 0xf; crc = (crc << 4) ^ (sum << 12) ^ (sum << 5) ^ (sum); } crc &= 0xffff; } return cpu_to_be16(crc); } /* Microsoft computes the CRC with the bytes in reverse order. */ static u16 csr1212_msft_crc16(const u32 *buffer, size_t length) { int shift; u32 data; u16 sum, crc = 0; for (; length; length--) { data = le32_to_cpu(*buffer); buffer++; for (shift = 28; shift >= 0; shift -= 4 ) { sum = ((crc >> 12) ^ (data >> shift)) & 0xf; crc = (crc << 4) ^ (sum << 12) ^ (sum << 5) ^ (sum); } crc &= 0xffff; } return cpu_to_be16(crc); } static struct csr1212_dentry * csr1212_find_keyval(struct csr1212_keyval *dir, struct csr1212_keyval *kv) { struct csr1212_dentry *pos; for (pos = dir->value.directory.dentries_head; pos != NULL; pos = pos->next) if (pos->kv == kv) return pos; return NULL; } static struct csr1212_keyval * csr1212_find_keyval_offset(struct csr1212_keyval *kv_list, u32 offset) { struct csr1212_keyval *kv; for (kv = kv_list->next; kv && (kv != kv_list); kv = kv->next) if (kv->offset == offset) return kv; return NULL; } /* Creation Routines */ struct csr1212_csr *csr1212_create_csr(struct csr1212_bus_ops *ops, size_t bus_info_size, void *private) { struct csr1212_csr *csr; csr = CSR1212_MALLOC(sizeof(*csr)); if (!csr) return NULL; csr->cache_head = csr1212_rom_cache_malloc(CSR1212_CONFIG_ROM_SPACE_OFFSET, CSR1212_CONFIG_ROM_SPACE_SIZE); if (!csr->cache_head) { CSR1212_FREE(csr); return NULL; } /* The keyval key id is not used for the root node, but a valid key id * that can be used for a directory needs to be passed to * csr1212_new_directory(). */ csr->root_kv = csr1212_new_directory(CSR1212_KV_ID_VENDOR); if (!csr->root_kv) { CSR1212_FREE(csr->cache_head); CSR1212_FREE(csr); return NULL; } csr->bus_info_data = csr->cache_head->data; csr->bus_info_len = bus_info_size; csr->crc_len = bus_info_size; csr->ops = ops; csr->private = private; csr->cache_tail = csr->cache_head; return csr; } void csr1212_init_local_csr(struct csr1212_csr *csr, const u32 *bus_info_data, int max_rom) { static const int mr_map[] = { 4, 64, 1024, 0 }; BUG_ON(max_rom & ~0x3); csr->max_rom = mr_map[max_rom]; memcpy(csr->bus_info_data, bus_info_data, csr->bus_info_len); } static struct csr1212_keyval *csr1212_new_keyval(u8 type, u8 key) { struct csr1212_keyval *kv; if (key < 0x30 && ((csr1212_key_id_type_map[key] & (1 << type)) == 0)) return NULL; kv = CSR1212_MALLOC(sizeof(*kv)); if (!kv) return NULL; atomic_set(&kv->refcnt, 1); kv->key.type = type; kv->key.id = key; kv->associate = NULL; kv->next = NULL; kv->prev = NULL; kv->offset = 0; kv->valid = 0; return kv; } struct csr1212_keyval *csr1212_new_immediate(u8 key, u32 value) { struct csr1212_keyval *kv; kv = csr1212_new_keyval(CSR1212_KV_TYPE_IMMEDIATE, key); if (!kv) return NULL; kv->value.immediate = value; kv->valid = 1; return kv; } static struct csr1212_keyval * csr1212_new_leaf(u8 key, const void *data, size_t data_len) { struct csr1212_keyval *kv; kv = csr1212_new_keyval(CSR1212_KV_TYPE_LEAF, key); if (!kv) return NULL; if (data_len > 0) { kv->value.leaf.data = CSR1212_MALLOC(data_len); if (!kv->value.leaf.data) { CSR1212_FREE(kv); return NULL; } if (data) memcpy(kv->value.leaf.data, data, data_len); } else { kv->value.leaf.data = NULL; } kv->value.leaf.len = bytes_to_quads(data_len); kv->offset = 0; kv->valid = 1; return kv; } static struct csr1212_keyval * csr1212_new_csr_offset(u8 key, u32 csr_offset) { struct csr1212_keyval *kv; kv = csr1212_new_keyval(CSR1212_KV_TYPE_CSR_OFFSET, key); if (!kv) return NULL; kv->value.csr_offset = csr_offset; kv->offset = 0; kv->valid = 1; return kv; } struct csr1212_keyval *csr1212_new_directory(u8 key) { struct csr1212_keyval *kv; kv = csr1212_new_keyval(CSR1212_KV_TYPE_DIRECTORY, key); if (!kv) return NULL; kv->value.directory.len = 0; kv->offset = 0; kv->value.directory.dentries_head = NULL; kv->value.directory.dentries_tail = NULL; kv->valid = 1; return kv; } void csr1212_associate_keyval(struct csr1212_keyval *kv, struct csr1212_keyval *associate) { BUG_ON(!kv || !associate || kv->key.id == CSR1212_KV_ID_DESCRIPTOR || (associate->key.id != CSR1212_KV_ID_DESCRIPTOR && associate->key.id != CSR1212_KV_ID_DEPENDENT_INFO && associate->key.id != CSR1212_KV_ID_EXTENDED_KEY && associate->key.id != CSR1212_KV_ID_EXTENDED_DATA && associate->key.id < 0x30) || (kv->key.id == CSR1212_KV_ID_EXTENDED_KEY_SPECIFIER_ID && associate->key.id != CSR1212_KV_ID_EXTENDED_KEY) || (kv->key.id == CSR1212_KV_ID_EXTENDED_KEY && associate->key.id != CSR1212_KV_ID_EXTENDED_DATA) || (associate->key.id == CSR1212_KV_ID_EXTENDED_KEY && kv->key.id != CSR1212_KV_ID_EXTENDED_KEY_SPECIFIER_ID) || (associate->key.id == CSR1212_KV_ID_EXTENDED_DATA && kv->key.id != CSR1212_KV_ID_EXTENDED_KEY)); if (kv->associate) csr1212_release_keyval(kv->associate); csr1212_keep_keyval(associate); kv->associate = associate; } static int __csr1212_attach_keyval_to_directory(struct csr1212_keyval *dir, struct csr1212_keyval *kv, bool keep_keyval) { struct csr1212_dentry *dentry; BUG_ON(!kv || !dir || dir->key.type != CSR1212_KV_TYPE_DIRECTORY); dentry = CSR1212_MALLOC(sizeof(*dentry)); if (!dentry) return -ENOMEM; if (keep_keyval) csr1212_keep_keyval(kv); dentry->kv = kv; dentry->next = NULL; dentry->prev = dir->value.directory.dentries_tail; if (!dir->value.directory.dentries_head) dir->value.directory.dentries_head = dentry; if (dir->value.directory.dentries_tail) dir->value.directory.dentries_tail->next = dentry; dir->value.directory.dentries_tail = dentry; return CSR1212_SUCCESS; } int csr1212_attach_keyval_to_directory(struct csr1212_keyval *dir, struct csr1212_keyval *kv) { return __csr1212_attach_keyval_to_directory(dir, kv, true); } #define CSR1212_DESCRIPTOR_LEAF_DATA(kv) \ (&((kv)->value.leaf.data[1])) #define CSR1212_DESCRIPTOR_LEAF_SET_TYPE(kv, type) \ ((kv)->value.leaf.data[0] = \ cpu_to_be32(CSR1212_DESCRIPTOR_LEAF_SPECIFIER_ID(kv) | \ ((type) << CSR1212_DESCRIPTOR_LEAF_TYPE_SHIFT))) #define CSR1212_DESCRIPTOR_LEAF_SET_SPECIFIER_ID(kv, spec_id) \ ((kv)->value.leaf.data[0] = \ cpu_to_be32((CSR1212_DESCRIPTOR_LEAF_TYPE(kv) << \ CSR1212_DESCRIPTOR_LEAF_TYPE_SHIFT) | \ ((spec_id) & CSR1212_DESCRIPTOR_LEAF_SPECIFIER_ID_MASK))) static struct csr1212_keyval * csr1212_new_descriptor_leaf(u8 dtype, u32 specifier_id, const void *data, size_t data_len) { struct csr1212_keyval *kv; kv = csr1212_new_leaf(CSR1212_KV_ID_DESCRIPTOR, NULL, data_len + CSR1212_DESCRIPTOR_LEAF_OVERHEAD); if (!kv) return NULL; CSR1212_DESCRIPTOR_LEAF_SET_TYPE(kv, dtype); CSR1212_DESCRIPTOR_LEAF_SET_SPECIFIER_ID(kv, specifier_id); if (data) memcpy(CSR1212_DESCRIPTOR_LEAF_DATA(kv), data, data_len); return kv; } /* Check if string conforms to minimal ASCII as per IEEE 1212 clause 7.4 */ static int csr1212_check_minimal_ascii(const char *s) { static const char minimal_ascii_table[] = { /* 1 2 4 8 16 32 64 128 */ 128, /* --, --, --, --, --, --, --, 07, */ 4 + 16 + 32, /* --, --, 0a, --, 0C, 0D, --, --, */ 0, /* --, --, --, --, --, --, --, --, */ 0, /* --, --, --, --, --, --, --, --, */ 255 - 8 - 16, /* 20, 21, 22, --, --, 25, 26, 27, */ 255, /* 28, 29, 2a, 2b, 2c, 2d, 2e, 2f, */ 255, /* 30, 31, 32, 33, 34, 35, 36, 37, */ 255, /* 38, 39, 3a, 3b, 3c, 3d, 3e, 3f, */ 255, /* 40, 41, 42, 43, 44, 45, 46, 47, */ 255, /* 48, 49, 4a, 4b, 4c, 4d, 4e, 4f, */ 255, /* 50, 51, 52, 53, 54, 55, 56, 57, */ 1 + 2 + 4 + 128, /* 58, 59, 5a, --, --, --, --, 5f, */ 255 - 1, /* --, 61, 62, 63, 64, 65, 66, 67, */ 255, /* 68, 69, 6a, 6b, 6c, 6d, 6e, 6f, */ 255, /* 70, 71, 72, 73, 74, 75, 76, 77, */ 1 + 2 + 4, /* 78, 79, 7a, --, --, --, --, --, */ }; int i, j; for (; *s; s++) { i = *s >> 3; /* i = *s / 8; */ j = 1 << (*s & 3); /* j = 1 << (*s % 8); */ if (i >= ARRAY_SIZE(minimal_ascii_table) || !(minimal_ascii_table[i] & j)) return -EINVAL; } return 0; } /* IEEE 1212 clause 7.5.4.1 textual descriptors (English, minimal ASCII) */ struct csr1212_keyval *csr1212_new_string_descriptor_leaf(const char *s) { struct csr1212_keyval *kv; u32 *text; size_t str_len, quads; if (!s || !*s || csr1212_check_minimal_ascii(s)) return NULL; str_len = strlen(s); quads = bytes_to_quads(str_len); kv = csr1212_new_descriptor_leaf(0, 0, NULL, quads_to_bytes(quads) + CSR1212_TEXTUAL_DESCRIPTOR_LEAF_OVERHEAD); if (!kv) return NULL; kv->value.leaf.data[1] = 0; /* width, character_set, language */ text = CSR1212_TEXTUAL_DESCRIPTOR_LEAF_DATA(kv); text[quads - 1] = 0; /* padding */ memcpy(text, s, str_len); return kv; } /* Destruction Routines */ void csr1212_detach_keyval_from_directory(struct csr1212_keyval *dir, struct csr1212_keyval *kv) { struct csr1212_dentry *dentry; if (!kv || !dir || dir->key.type != CSR1212_KV_TYPE_DIRECTORY) return; dentry = csr1212_find_keyval(dir, kv); if (!dentry) return; if (dentry->prev) dentry->prev->next = dentry->next; if (dentry->next) dentry->next->prev = dentry->prev; if (dir->value.directory.dentries_head == dentry) dir->value.directory.dentries_head = dentry->next; if (dir->value.directory.dentries_tail == dentry) dir->value.directory.dentries_tail = dentry->prev; CSR1212_FREE(dentry); csr1212_release_keyval(kv); } /* This function is used to free the memory taken by a keyval. If the given * keyval is a directory type, then any keyvals contained in that directory * will be destroyed as well if noone holds a reference on them. By means of * list manipulation, this routine will descend a directory structure in a * non-recursive manner. */ void csr1212_release_keyval(struct csr1212_keyval *kv) { struct csr1212_keyval *k, *a; struct csr1212_dentry dentry; struct csr1212_dentry *head, *tail; if (!atomic_dec_and_test(&kv->refcnt)) return; dentry.kv = kv; dentry.next = NULL; dentry.prev = NULL; head = &dentry; tail = head; while (head) { k = head->kv; while (k) { /* must not dec_and_test kv->refcnt again */ if (k != kv && !atomic_dec_and_test(&k->refcnt)) break; a = k->associate; if (k->key.type == CSR1212_KV_TYPE_DIRECTORY) { /* If the current entry is a directory, move all * the entries to the destruction list. */ if (k->value.directory.dentries_head) { tail->next = k->value.directory.dentries_head; k->value.directory.dentries_head->prev = tail; tail = k->value.directory.dentries_tail; } } free_keyval(k); k = a; } head = head->next; if (head) { if (head->prev && head->prev != &dentry) CSR1212_FREE(head->prev); head->prev = NULL; } else if (tail != &dentry) { CSR1212_FREE(tail); } } } void csr1212_destroy_csr(struct csr1212_csr *csr) { struct csr1212_csr_rom_cache *c, *oc; struct csr1212_cache_region *cr, *ocr; csr1212_release_keyval(csr->root_kv); c = csr->cache_head; while (c) { oc = c; cr = c->filled_head; while (cr) { ocr = cr; cr = cr->next; CSR1212_FREE(ocr); } c = c->next; CSR1212_FREE(oc); } CSR1212_FREE(csr); } /* CSR Image Creation */ static int csr1212_append_new_cache(struct csr1212_csr *csr, size_t romsize) { struct csr1212_csr_rom_cache *cache; u64 csr_addr; BUG_ON(!csr || !csr->ops || !csr->ops->allocate_addr_range || !csr->ops->release_addr || csr->max_rom < 1); /* ROM size must be a multiple of csr->max_rom */ romsize = (romsize + (csr->max_rom - 1)) & ~(csr->max_rom - 1); csr_addr = csr->ops->allocate_addr_range(romsize, csr->max_rom, csr->private); if (csr_addr == CSR1212_INVALID_ADDR_SPACE) return -ENOMEM; if (csr_addr < CSR1212_REGISTER_SPACE_BASE) { /* Invalid address returned from allocate_addr_range(). */ csr->ops->release_addr(csr_addr, csr->private); return -ENOMEM; } cache = csr1212_rom_cache_malloc(csr_addr - CSR1212_REGISTER_SPACE_BASE, romsize); if (!cache) { csr->ops->release_addr(csr_addr, csr->private); return -ENOMEM; } cache->ext_rom = csr1212_new_keyval(CSR1212_KV_TYPE_LEAF, CSR1212_KV_ID_EXTENDED_ROM); if (!cache->ext_rom) { csr->ops->release_addr(csr_addr, csr->private); CSR1212_FREE(cache); return -ENOMEM; } if (csr1212_attach_keyval_to_directory(csr->root_kv, cache->ext_rom) != CSR1212_SUCCESS) { csr1212_release_keyval(cache->ext_rom); csr->ops->release_addr(csr_addr, csr->private); CSR1212_FREE(cache); return -ENOMEM; } cache->ext_rom->offset = csr_addr - CSR1212_REGISTER_SPACE_BASE; cache->ext_rom->value.leaf.len = -1; cache->ext_rom->value.leaf.data = cache->data; /* Add cache to tail of cache list */ cache->prev = csr->cache_tail; csr->cache_tail->next = cache; csr->cache_tail = cache; return CSR1212_SUCCESS; } static void csr1212_remove_cache(struct csr1212_csr *csr, struct csr1212_csr_rom_cache *cache) { if (csr->cache_head == cache) csr->cache_head = cache->next; if (csr->cache_tail == cache) csr->cache_tail = cache->prev; if (cache->prev) cache->prev->next = cache->next; if (cache->next) cache->next->prev = cache->prev; if (cache->ext_rom) { csr1212_detach_keyval_from_directory(csr->root_kv, cache->ext_rom); csr1212_release_keyval(cache->ext_rom); } CSR1212_FREE(cache); } static int csr1212_generate_layout_subdir(struct csr1212_keyval *dir, struct csr1212_keyval **layout_tail) { struct csr1212_dentry *dentry; struct csr1212_keyval *dkv; struct csr1212_keyval *last_extkey_spec = NULL; struct csr1212_keyval *last_extkey = NULL; int num_entries = 0; for (dentry = dir->value.directory.dentries_head; dentry; dentry = dentry->next) { for (dkv = dentry->kv; dkv; dkv = dkv->associate) { /* Special Case: Extended Key Specifier_ID */ if (dkv->key.id == CSR1212_KV_ID_EXTENDED_KEY_SPECIFIER_ID) { if (last_extkey_spec == NULL) last_extkey_spec = dkv; else if (dkv->value.immediate != last_extkey_spec->value.immediate) last_extkey_spec = dkv; else continue; /* Special Case: Extended Key */ } else if (dkv->key.id == CSR1212_KV_ID_EXTENDED_KEY) { if (last_extkey == NULL) last_extkey = dkv; else if (dkv->value.immediate != last_extkey->value.immediate) last_extkey = dkv; else continue; } num_entries += 1; switch (dkv->key.type) { default: case CSR1212_KV_TYPE_IMMEDIATE: case CSR1212_KV_TYPE_CSR_OFFSET: break; case CSR1212_KV_TYPE_LEAF: case CSR1212_KV_TYPE_DIRECTORY: /* Remove from list */ if (dkv->prev && (dkv->prev->next == dkv)) dkv->prev->next = dkv->next; if (dkv->next && (dkv->next->prev == dkv)) dkv->next->prev = dkv->prev; //if (dkv == *layout_tail) // *layout_tail = dkv->prev; /* Special case: Extended ROM leafs */ if (dkv->key.id == CSR1212_KV_ID_EXTENDED_ROM) { dkv->value.leaf.len = -1; /* Don't add Extended ROM leafs in the * layout list, they are handled * differently. */ break; } /* Add to tail of list */ dkv->next = NULL; dkv->prev = *layout_tail; (*layout_tail)->next = dkv; *layout_tail = dkv; break; } } } return num_entries; } static size_t csr1212_generate_layout_order(struct csr1212_keyval *kv) { struct csr1212_keyval *ltail = kv; size_t agg_size = 0; while (kv) { switch (kv->key.type) { case CSR1212_KV_TYPE_LEAF: /* Add 1 quadlet for crc/len field */ agg_size += kv->value.leaf.len + 1; break; case CSR1212_KV_TYPE_DIRECTORY: kv->value.directory.len = csr1212_generate_layout_subdir(kv, <ail); /* Add 1 quadlet for crc/len field */ agg_size += kv->value.directory.len + 1; break; } kv = kv->next; } return quads_to_bytes(agg_size); } static struct csr1212_keyval * csr1212_generate_positions(struct csr1212_csr_rom_cache *cache, struct csr1212_keyval *start_kv, int start_pos) { struct csr1212_keyval *kv = start_kv; struct csr1212_keyval *okv = start_kv; int pos = start_pos; int kv_len = 0, okv_len = 0; cache->layout_head = kv; while (kv && pos < cache->size) { /* Special case: Extended ROM leafs */ if (kv->key.id != CSR1212_KV_ID_EXTENDED_ROM) kv->offset = cache->offset + pos; switch (kv->key.type) { case CSR1212_KV_TYPE_LEAF: kv_len = kv->value.leaf.len; break; case CSR1212_KV_TYPE_DIRECTORY: kv_len = kv->value.directory.len; break; default: /* Should never get here */ WARN_ON(1); break; } pos += quads_to_bytes(kv_len + 1); if (pos <= cache->size) { okv = kv; okv_len = kv_len; kv = kv->next; } } cache->layout_tail = okv; cache->len = okv->offset - cache->offset + quads_to_bytes(okv_len + 1); return kv; } #define CSR1212_KV_KEY_SHIFT 24 #define CSR1212_KV_KEY_TYPE_SHIFT 6 #define CSR1212_KV_KEY_ID_MASK 0x3f #define CSR1212_KV_KEY_TYPE_MASK 0x3 /* after shift */ static void csr1212_generate_tree_subdir(struct csr1212_keyval *dir, u32 *data_buffer) { struct csr1212_dentry *dentry; struct csr1212_keyval *last_extkey_spec = NULL; struct csr1212_keyval *last_extkey = NULL; int index = 0; for (dentry = dir->value.directory.dentries_head; dentry; dentry = dentry->next) { struct csr1212_keyval *a; for (a = dentry->kv; a; a = a->associate) { u32 value = 0; /* Special Case: Extended Key Specifier_ID */ if (a->key.id == CSR1212_KV_ID_EXTENDED_KEY_SPECIFIER_ID) { if (last_extkey_spec == NULL) last_extkey_spec = a; else if (a->value.immediate != last_extkey_spec->value.immediate) last_extkey_spec = a; else continue; /* Special Case: Extended Key */ } else if (a->key.id == CSR1212_KV_ID_EXTENDED_KEY) { if (last_extkey == NULL) last_extkey = a; else if (a->value.immediate != last_extkey->value.immediate) last_extkey = a; else continue; } switch (a->key.type) { case CSR1212_KV_TYPE_IMMEDIATE: value = a->value.immediate; break; case CSR1212_KV_TYPE_CSR_OFFSET: value = a->value.csr_offset; break; case CSR1212_KV_TYPE_LEAF: value = a->offset; value -= dir->offset + quads_to_bytes(1+index); value = bytes_to_quads(value); break; case CSR1212_KV_TYPE_DIRECTORY: value = a->offset; value -= dir->offset + quads_to_bytes(1+index); value = bytes_to_quads(value); break; default: /* Should never get here */ WARN_ON(1); break; } value |= (a->key.id & CSR1212_KV_KEY_ID_MASK) << CSR1212_KV_KEY_SHIFT; value |= (a->key.type & CSR1212_KV_KEY_TYPE_MASK) << (CSR1212_KV_KEY_SHIFT + CSR1212_KV_KEY_TYPE_SHIFT); data_buffer[index] = cpu_to_be32(value); index++; } } } struct csr1212_keyval_img { u16 length; u16 crc; /* Must be last */ u32 data[0]; /* older gcc can't handle [] which is standard */ }; static void csr1212_fill_cache(struct csr1212_csr_rom_cache *cache) { struct csr1212_keyval *kv, *nkv; struct csr1212_keyval_img *kvi; for (kv = cache->layout_head; kv != cache->layout_tail->next; kv = nkv) { kvi = (struct csr1212_keyval_img *)(cache->data + bytes_to_quads(kv->offset - cache->offset)); switch (kv->key.type) { default: case CSR1212_KV_TYPE_IMMEDIATE: case CSR1212_KV_TYPE_CSR_OFFSET: /* Should never get here */ WARN_ON(1); break; case CSR1212_KV_TYPE_LEAF: /* Don't copy over Extended ROM areas, they are * already filled out! */ if (kv->key.id != CSR1212_KV_ID_EXTENDED_ROM) memcpy(kvi->data, kv->value.leaf.data, quads_to_bytes(kv->value.leaf.len)); kvi->length = cpu_to_be16(kv->value.leaf.len); kvi->crc = csr1212_crc16(kvi->data, kv->value.leaf.len); break; case CSR1212_KV_TYPE_DIRECTORY: csr1212_generate_tree_subdir(kv, kvi->data); kvi->length = cpu_to_be16(kv->value.directory.len); kvi->crc = csr1212_crc16(kvi->data, kv->value.directory.len); break; } nkv = kv->next; if (kv->prev) kv->prev->next = NULL; if (kv->next) kv->next->prev = NULL; kv->prev = NULL; kv->next = NULL; } } /* This size is arbitrarily chosen. * The struct overhead is subtracted for more economic allocations. */ #define CSR1212_EXTENDED_ROM_SIZE (2048 - sizeof(struct csr1212_csr_rom_cache)) int csr1212_generate_csr_image(struct csr1212_csr *csr) { struct csr1212_bus_info_block_img *bi; struct csr1212_csr_rom_cache *cache; struct csr1212_keyval *kv; size_t agg_size; int ret; int init_offset; BUG_ON(!csr); cache = csr->cache_head; bi = (struct csr1212_bus_info_block_img*)cache->data; bi->length = bytes_to_quads(csr->bus_info_len) - 1; bi->crc_length = bi->length; bi->crc = csr1212_crc16(bi->data, bi->crc_length); csr->root_kv->next = NULL; csr->root_kv->prev = NULL; agg_size = csr1212_generate_layout_order(csr->root_kv); init_offset = csr->bus_info_len; for (kv = csr->root_kv, cache = csr->cache_head; kv; cache = cache->next) { if (!cache) { /* Estimate approximate number of additional cache * regions needed (it assumes that the cache holding * the first 1K Config ROM space always exists). */ int est_c = agg_size / (CSR1212_EXTENDED_ROM_SIZE - (2 * sizeof(u32))) + 1; /* Add additional cache regions, extras will be * removed later */ for (; est_c; est_c--) { ret = csr1212_append_new_cache(csr, CSR1212_EXTENDED_ROM_SIZE); if (ret != CSR1212_SUCCESS) return ret; } /* Need to re-layout for additional cache regions */ agg_size = csr1212_generate_layout_order(csr->root_kv); kv = csr->root_kv; cache = csr->cache_head; init_offset = csr->bus_info_len; } kv = csr1212_generate_positions(cache, kv, init_offset); agg_size -= cache->len; init_offset = sizeof(u32); } /* Remove unused, excess cache regions */ while (cache) { struct csr1212_csr_rom_cache *oc = cache; cache = cache->next; csr1212_remove_cache(csr, oc); } /* Go through the list backward so that when done, the correct CRC * will be calculated for the Extended ROM areas. */ for (cache = csr->cache_tail; cache; cache = cache->prev) { /* Only Extended ROM caches should have this set. */ if (cache->ext_rom) { int leaf_size; /* Make sure the Extended ROM leaf is a multiple of * max_rom in size. */ BUG_ON(csr->max_rom < 1); leaf_size = (cache->len + (csr->max_rom - 1)) & ~(csr->max_rom - 1); /* Zero out the unused ROM region */ memset(cache->data + bytes_to_quads(cache->len), 0x00, leaf_size - cache->len); /* Subtract leaf header */ leaf_size -= sizeof(u32); /* Update the Extended ROM leaf length */ cache->ext_rom->value.leaf.len = bytes_to_quads(leaf_size); } else { /* Zero out the unused ROM region */ memset(cache->data + bytes_to_quads(cache->len), 0x00, cache->size - cache->len); } /* Copy the data into the cache buffer */ csr1212_fill_cache(cache); if (cache != csr->cache_head) { /* Set the length and CRC of the extended ROM. */ struct csr1212_keyval_img *kvi = (struct csr1212_keyval_img*)cache->data; u16 len = bytes_to_quads(cache->len) - 1; kvi->length = cpu_to_be16(len); kvi->crc = csr1212_crc16(kvi->data, len); } } return CSR1212_SUCCESS; } int csr1212_read(struct csr1212_csr *csr, u32 offset, void *buffer, u32 len) { struct csr1212_csr_rom_cache *cache; for (cache = csr->cache_head; cache; cache = cache->next) if (offset >= cache->offset && (offset + len) <= (cache->offset + cache->size)) { memcpy(buffer, &cache->data[ bytes_to_quads(offset - cache->offset)], len); return CSR1212_SUCCESS; } return -ENOENT; } /* Parse a chunk of data as a Config ROM */ static int csr1212_parse_bus_info_block(struct csr1212_csr *csr) { struct csr1212_bus_info_block_img *bi; struct csr1212_cache_region *cr; int i; int ret; /* IEEE 1212 says that the entire bus info block should be readable in * a single transaction regardless of the max_rom value. * Unfortunately, many IEEE 1394 devices do not abide by that, so the * bus info block will be read 1 quadlet at a time. The rest of the * ConfigROM will be read according to the max_rom field. */ for (i = 0; i < csr->bus_info_len; i += sizeof(u32)) { ret = csr->ops->bus_read(csr, CSR1212_CONFIG_ROM_SPACE_BASE + i, sizeof(u32), &csr->cache_head->data[bytes_to_quads(i)], csr->private); if (ret != CSR1212_SUCCESS) return ret; /* check ROM header's info_length */ if (i == 0 && be32_to_cpu(csr->cache_head->data[0]) >> 24 != bytes_to_quads(csr->bus_info_len) - 1) return -EINVAL; } bi = (struct csr1212_bus_info_block_img*)csr->cache_head->data; csr->crc_len = quads_to_bytes(bi->crc_length); /* IEEE 1212 recommends that crc_len be equal to bus_info_len, but that * is not always the case, so read the rest of the crc area 1 quadlet at * a time. */ for (i = csr->bus_info_len; i <= csr->crc_len; i += sizeof(u32)) { ret = csr->ops->bus_read(csr, CSR1212_CONFIG_ROM_SPACE_BASE + i, sizeof(u32), &csr->cache_head->data[bytes_to_quads(i)], csr->private); if (ret != CSR1212_SUCCESS) return ret; } /* Apparently there are many different wrong implementations of the CRC * algorithm. We don't fail, we just warn. */ if ((csr1212_crc16(bi->data, bi->crc_length) != bi->crc) && (csr1212_msft_crc16(bi->data, bi->crc_length) != bi->crc)) printk(KERN_DEBUG "IEEE 1394 device has ROM CRC error\n"); cr = CSR1212_MALLOC(sizeof(*cr)); if (!cr) return -ENOMEM; cr->next = NULL; cr->prev = NULL; cr->offset_start = 0; cr->offset_end = csr->crc_len + 4; csr->cache_head->filled_head = cr; csr->cache_head->filled_tail = cr; return CSR1212_SUCCESS; } #define CSR1212_KV_KEY(q) (be32_to_cpu(q) >> CSR1212_KV_KEY_SHIFT) #define CSR1212_KV_KEY_TYPE(q) (CSR1212_KV_KEY(q) >> CSR1212_KV_KEY_TYPE_SHIFT) #define CSR1212_KV_KEY_ID(q) (CSR1212_KV_KEY(q) & CSR1212_KV_KEY_ID_MASK) #define CSR1212_KV_VAL_MASK 0xffffff #define CSR1212_KV_VAL(q) (be32_to_cpu(q) & CSR1212_KV_VAL_MASK) static int csr1212_parse_dir_entry(struct csr1212_keyval *dir, u32 ki, u32 kv_pos) { int ret = CSR1212_SUCCESS; struct csr1212_keyval *k = NULL; u32 offset; bool keep_keyval = true; switch (CSR1212_KV_KEY_TYPE(ki)) { case CSR1212_KV_TYPE_IMMEDIATE: k = csr1212_new_immediate(CSR1212_KV_KEY_ID(ki), CSR1212_KV_VAL(ki)); if (!k) { ret = -ENOMEM; goto out; } /* Don't keep local reference when parsing. */ keep_keyval = false; break; case CSR1212_KV_TYPE_CSR_OFFSET: k = csr1212_new_csr_offset(CSR1212_KV_KEY_ID(ki), CSR1212_KV_VAL(ki)); if (!k) { ret = -ENOMEM; goto out; } /* Don't keep local reference when parsing. */ keep_keyval = false; break; default: /* Compute the offset from 0xffff f000 0000. */ offset = quads_to_bytes(CSR1212_KV_VAL(ki)) + kv_pos; if (offset == kv_pos) { /* Uh-oh. Can't have a relative offset of 0 for Leaves * or Directories. The Config ROM image is most likely * messed up, so we'll just abort here. */ ret = -EIO; goto out; } k = csr1212_find_keyval_offset(dir, offset); if (k) break; /* Found it. */ if (CSR1212_KV_KEY_TYPE(ki) == CSR1212_KV_TYPE_DIRECTORY) k = csr1212_new_directory(CSR1212_KV_KEY_ID(ki)); else k = csr1212_new_leaf(CSR1212_KV_KEY_ID(ki), NULL, 0); if (!k) { ret = -ENOMEM; goto out; } /* Don't keep local reference when parsing. */ keep_keyval = false; /* Contents not read yet so it's not valid. */ k->valid = 0; k->offset = offset; k->prev = dir; k->next = dir->next; dir->next->prev = k; dir->next = k; } ret = __csr1212_attach_keyval_to_directory(dir, k, keep_keyval); out: if (ret != CSR1212_SUCCESS && k != NULL) free_keyval(k); return ret; } int csr1212_parse_keyval(struct csr1212_keyval *kv, struct csr1212_csr_rom_cache *cache) { struct csr1212_keyval_img *kvi; int i; int ret = CSR1212_SUCCESS; int kvi_len; kvi = (struct csr1212_keyval_img*) &cache->data[bytes_to_quads(kv->offset - cache->offset)]; kvi_len = be16_to_cpu(kvi->length); /* Apparently there are many different wrong implementations of the CRC * algorithm. We don't fail, we just warn. */ if ((csr1212_crc16(kvi->data, kvi_len) != kvi->crc) && (csr1212_msft_crc16(kvi->data, kvi_len) != kvi->crc)) printk(KERN_DEBUG "IEEE 1394 device has ROM CRC error\n"); switch (kv->key.type) { case CSR1212_KV_TYPE_DIRECTORY: for (i = 0; i < kvi_len; i++) { u32 ki = kvi->data[i]; /* Some devices put null entries in their unit * directories. If we come across such an entry, * then skip it. */ if (ki == 0x0) continue; ret = csr1212_parse_dir_entry(kv, ki, kv->offset + quads_to_bytes(i + 1)); } kv->value.directory.len = kvi_len; break; case CSR1212_KV_TYPE_LEAF: if (kv->key.id != CSR1212_KV_ID_EXTENDED_ROM) { size_t size = quads_to_bytes(kvi_len); kv->value.leaf.data = CSR1212_MALLOC(size); if (!kv->value.leaf.data) { ret = -ENOMEM; goto out; } kv->value.leaf.len = kvi_len; memcpy(kv->value.leaf.data, kvi->data, size); } break; } kv->valid = 1; out: return ret; } static int csr1212_read_keyval(struct csr1212_csr *csr, struct csr1212_keyval *kv) { struct csr1212_cache_region *cr, *ncr, *newcr = NULL; struct csr1212_keyval_img *kvi = NULL; struct csr1212_csr_rom_cache *cache; int cache_index; u64 addr; u32 *cache_ptr; u16 kv_len = 0; BUG_ON(!csr || !kv || csr->max_rom < 1); /* First find which cache the data should be in (or go in if not read * yet). */ for (cache = csr->cache_head; cache; cache = cache->next) if (kv->offset >= cache->offset && kv->offset < (cache->offset + cache->size)) break; if (!cache) { u32 q, cache_size; /* Only create a new cache for Extended ROM leaves. */ if (kv->key.id != CSR1212_KV_ID_EXTENDED_ROM) return -EINVAL; if (csr->ops->bus_read(csr, CSR1212_REGISTER_SPACE_BASE + kv->offset, sizeof(u32), &q, csr->private)) return -EIO; kv->value.leaf.len = be32_to_cpu(q) >> 16; cache_size = (quads_to_bytes(kv->value.leaf.len + 1) + (csr->max_rom - 1)) & ~(csr->max_rom - 1); cache = csr1212_rom_cache_malloc(kv->offset, cache_size); if (!cache) return -ENOMEM; kv->value.leaf.data = &cache->data[1]; csr->cache_tail->next = cache; cache->prev = csr->cache_tail; cache->next = NULL; csr->cache_tail = cache; cache->filled_head = CSR1212_MALLOC(sizeof(*cache->filled_head)); if (!cache->filled_head) return -ENOMEM; cache->filled_head->offset_start = 0; cache->filled_head->offset_end = sizeof(u32); cache->filled_tail = cache->filled_head; cache->filled_head->next = NULL; cache->filled_head->prev = NULL; cache->data[0] = q; /* Don't read the entire extended ROM now. Pieces of it will * be read when entries inside it are read. */ return csr1212_parse_keyval(kv, cache); } cache_index = kv->offset - cache->offset; /* Now seach read portions of the cache to see if it is there. */ for (cr = cache->filled_head; cr; cr = cr->next) { if (cache_index < cr->offset_start) { newcr = CSR1212_MALLOC(sizeof(*newcr)); if (!newcr) return -ENOMEM; newcr->offset_start = cache_index & ~(csr->max_rom - 1); newcr->offset_end = newcr->offset_start; newcr->next = cr; newcr->prev = cr->prev; cr->prev = newcr; cr = newcr; break; } else if ((cache_index >= cr->offset_start) && (cache_index < cr->offset_end)) { kvi = (struct csr1212_keyval_img*) (&cache->data[bytes_to_quads(cache_index)]); kv_len = quads_to_bytes(be16_to_cpu(kvi->length) + 1); break; } else if (cache_index == cr->offset_end) { break; } } if (!cr) { cr = cache->filled_tail; newcr = CSR1212_MALLOC(sizeof(*newcr)); if (!newcr) return -ENOMEM; newcr->offset_start = cache_index & ~(csr->max_rom - 1); newcr->offset_end = newcr->offset_start; newcr->prev = cr; newcr->next = cr->next; cr->next = newcr; cr = newcr; cache->filled_tail = newcr; } while(!kvi || cr->offset_end < cache_index + kv_len) { cache_ptr = &cache->data[bytes_to_quads(cr->offset_end & ~(csr->max_rom - 1))]; addr = (CSR1212_CSR_ARCH_REG_SPACE_BASE + cache->offset + cr->offset_end) & ~(csr->max_rom - 1); if (csr->ops->bus_read(csr, addr, csr->max_rom, cache_ptr, csr->private)) { if (csr->max_rom == 4) /* We've got problems! */ return -EIO; /* Apperently the max_rom value was a lie, set it to * do quadlet reads and try again. */ csr->max_rom = 4; continue; } cr->offset_end += csr->max_rom - (cr->offset_end & (csr->max_rom - 1)); if (!kvi && (cr->offset_end > cache_index)) { kvi = (struct csr1212_keyval_img*) (&cache->data[bytes_to_quads(cache_index)]); kv_len = quads_to_bytes(be16_to_cpu(kvi->length) + 1); } if ((kv_len + (kv->offset - cache->offset)) > cache->size) { /* The Leaf or Directory claims its length extends * beyond the ConfigROM image region and thus beyond the * end of our cache region. Therefore, we abort now * rather than seg faulting later. */ return -EIO; } ncr = cr->next; if (ncr && (cr->offset_end >= ncr->offset_start)) { /* consolidate region entries */ ncr->offset_start = cr->offset_start; if (cr->prev) cr->prev->next = cr->next; ncr->prev = cr->prev; if (cache->filled_head == cr) cache->filled_head = ncr; CSR1212_FREE(cr); cr = ncr; } } return csr1212_parse_keyval(kv, cache); } struct csr1212_keyval * csr1212_get_keyval(struct csr1212_csr *csr, struct csr1212_keyval *kv) { if (!kv) return NULL; if (!kv->valid) if (csr1212_read_keyval(csr, kv) != CSR1212_SUCCESS) return NULL; return kv; } int csr1212_parse_csr(struct csr1212_csr *csr) { static const int mr_map[] = { 4, 64, 1024, 0 }; struct csr1212_dentry *dentry; int ret; BUG_ON(!csr || !csr->ops || !csr->ops->bus_read); ret = csr1212_parse_bus_info_block(csr); if (ret != CSR1212_SUCCESS) return ret; if (!csr->ops->get_max_rom) { csr->max_rom = mr_map[0]; /* default value */ } else { int i = csr->ops->get_max_rom(csr->bus_info_data, csr->private); if (i & ~0x3) return -EINVAL; csr->max_rom = mr_map[i]; } csr->cache_head->layout_head = csr->root_kv; csr->cache_head->layout_tail = csr->root_kv; csr->root_kv->offset = (CSR1212_CONFIG_ROM_SPACE_BASE & 0xffff) + csr->bus_info_len; csr->root_kv->valid = 0; csr->root_kv->next = csr->root_kv; csr->root_kv->prev = csr->root_kv; ret = csr1212_read_keyval(csr, csr->root_kv); if (ret != CSR1212_SUCCESS) return ret; /* Scan through the Root directory finding all extended ROM regions * and make cache regions for them */ for (dentry = csr->root_kv->value.directory.dentries_head; dentry; dentry = dentry->next) { if (dentry->kv->key.id == CSR1212_KV_ID_EXTENDED_ROM && !dentry->kv->valid) { ret = csr1212_read_keyval(csr, dentry->kv); if (ret != CSR1212_SUCCESS) return ret; } } return CSR1212_SUCCESS; }