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linux-next/drivers/ieee1394/csr1212.c
Stefan Richter 0bed181968 ieee1394: ignore nonzero Bus_Info_Block.max_rom, fetch config ROM in quadlets 
It is already known that buggy firmwares exist which report a bogus
link_spd in their config ROM bus info block.  We now got the first
report of a bogus max_rom too (Freecom FireWire Hard Drive 1TB,
http://bugzilla.kernel.org/show_bug.cgi?id=12206).

I suspect other OSs only use quadlet reads to fetch the config ROM,
otherwise the firmware authors would have noticed their mistake.
Hence limit ieee1394's config ROM fetching routine to quadlets as the
safe minimum regardless of what the bus info block says.

This will potentially slow the bus reset handling by nodemgr somewhat
down.  But most existing devices support only quadlet reads anyway,
hence there will often be no actual difference to before this change.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2009-01-04 23:50:34 +01:00

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/*
* 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) DIV_ROUND_UP(_b, 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, &ltail);
/* 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;
}
/*
* Apparently there are many different wrong implementations of the CRC
* algorithm. We don't fail, we just warn... approximately once per GUID.
*/
static void
csr1212_check_crc(const u32 *buffer, size_t length, u16 crc, __be32 *guid)
{
static u64 last_bad_eui64;
u64 eui64 = ((u64)be32_to_cpu(guid[0]) << 32) | be32_to_cpu(guid[1]);
if (csr1212_crc16(buffer, length) == crc ||
csr1212_msft_crc16(buffer, length) == crc ||
eui64 == last_bad_eui64)
return;
printk(KERN_DEBUG "ieee1394: config ROM CRC error\n");
last_bad_eui64 = eui64;
}
/* 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;
for (i = 0; i < csr->bus_info_len; i += sizeof(u32)) {
ret = csr->ops->bus_read(csr, CSR1212_CONFIG_ROM_SPACE_BASE + i,
&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,
&csr->cache_head->data[bytes_to_quads(i)],
csr->private);
if (ret != CSR1212_SUCCESS)
return ret;
}
csr1212_check_crc(bi->data, bi->crc_length, bi->crc,
&csr->bus_info_data[3]);
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);
/* GUID is wrong in here in case of extended ROM. We don't care. */
csr1212_check_crc(kvi->data, kvi_len, kvi->crc, &cache->data[3]);
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,
&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, cache_ptr, csr->private))
return -EIO;
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)
{
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;
/*
* There has been a buggy firmware with bus_info_block.max_rom > 0
* spotted which actually only supported quadlet read requests to the
* config ROM. Therefore read everything quadlet by quadlet regardless
* of what the bus info block says.
*/
csr->max_rom = 4;
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;
}
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