* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
+#include <linux/bug.h>
#include <linux/ctype.h>
#include <linux/delay.h>
#include <linux/device.h>
#include "core.h"
-void fw_csr_iterator_init(struct fw_csr_iterator *ci, u32 * p)
+void fw_csr_iterator_init(struct fw_csr_iterator *ci, const u32 *p)
{
ci->p = p + 1;
ci->end = ci->p + (p[0] >> 16);
}
EXPORT_SYMBOL(fw_csr_iterator_next);
+static const u32 *search_leaf(const u32 *directory, int search_key)
+{
+ struct fw_csr_iterator ci;
+ int last_key = 0, key, value;
+
+ fw_csr_iterator_init(&ci, directory);
+ while (fw_csr_iterator_next(&ci, &key, &value)) {
+ if (last_key == search_key &&
+ key == (CSR_DESCRIPTOR | CSR_LEAF))
+ return ci.p - 1 + value;
+
+ last_key = key;
+ }
+
+ return NULL;
+}
+
+static int textual_leaf_to_string(const u32 *block, char *buf, size_t size)
+{
+ unsigned int quadlets, i;
+ char c;
+
+ if (!size || !buf)
+ return -EINVAL;
+
+ quadlets = min(block[0] >> 16, 256U);
+ if (quadlets < 2)
+ return -ENODATA;
+
+ if (block[1] != 0 || block[2] != 0)
+ /* unknown language/character set */
+ return -ENODATA;
+
+ block += 3;
+ quadlets -= 2;
+ for (i = 0; i < quadlets * 4 && i < size - 1; i++) {
+ c = block[i / 4] >> (24 - 8 * (i % 4));
+ if (c == '\0')
+ break;
+ buf[i] = c;
+ }
+ buf[i] = '\0';
+
+ return i;
+}
+
+/**
+ * fw_csr_string - reads a string from the configuration ROM
+ * @directory: e.g. root directory or unit directory
+ * @key: the key of the preceding directory entry
+ * @buf: where to put the string
+ * @size: size of @buf, in bytes
+ *
+ * The string is taken from a minimal ASCII text descriptor leaf after
+ * the immediate entry with @key. The string is zero-terminated.
+ * Returns strlen(buf) or a negative error code.
+ */
+int fw_csr_string(const u32 *directory, int key, char *buf, size_t size)
+{
+ const u32 *leaf = search_leaf(directory, key);
+ if (!leaf)
+ return -ENOENT;
+
+ return textual_leaf_to_string(leaf, buf, size);
+}
+EXPORT_SYMBOL(fw_csr_string);
+
static bool is_fw_unit(struct device *dev);
-static int match_unit_directory(u32 *directory, u32 match_flags,
+static int match_unit_directory(const u32 *directory, u32 match_flags,
const struct ieee1394_device_id *id)
{
struct fw_csr_iterator ci;
struct config_rom_attribute *attr =
container_of(dattr, struct config_rom_attribute, attr);
struct fw_csr_iterator ci;
- u32 *dir;
+ const u32 *dir;
int key, value, ret = -ENOENT;
down_read(&fw_device_rwsem);
{
struct config_rom_attribute *attr =
container_of(dattr, struct config_rom_attribute, attr);
- struct fw_csr_iterator ci;
- u32 *dir, *block = NULL, *p, *end;
- int length, key, value, last_key = 0, ret = -ENOENT;
- char *b;
+ const u32 *dir;
+ size_t bufsize;
+ char dummy_buf[2];
+ int ret;
down_read(&fw_device_rwsem);
else
dir = fw_device(dev)->config_rom + 5;
- fw_csr_iterator_init(&ci, dir);
- while (fw_csr_iterator_next(&ci, &key, &value)) {
- if (attr->key == last_key &&
- key == (CSR_DESCRIPTOR | CSR_LEAF))
- block = ci.p - 1 + value;
- last_key = key;
+ if (buf) {
+ bufsize = PAGE_SIZE - 1;
+ } else {
+ buf = dummy_buf;
+ bufsize = 1;
}
- if (block == NULL)
- goto out;
-
- length = min(block[0] >> 16, 256U);
- if (length < 3)
- goto out;
+ ret = fw_csr_string(dir, attr->key, buf, bufsize);
- if (block[1] != 0 || block[2] != 0)
- /* Unknown encoding. */
- goto out;
-
- if (buf == NULL) {
- ret = length * 4;
- goto out;
+ if (ret >= 0) {
+ /* Strip trailing whitespace and add newline. */
+ while (ret > 0 && isspace(buf[ret - 1]))
+ ret--;
+ strcpy(buf + ret, "\n");
+ ret++;
}
- b = buf;
- end = &block[length + 1];
- for (p = &block[3]; p < end; p++, b += 4)
- * (u32 *) b = (__force u32) __cpu_to_be32(*p);
-
- /* Strip trailing whitespace and add newline. */
- while (b--, (isspace(*b) || *b == '\0') && b > buf);
- strcpy(b + 1, "\n");
- ret = b + 2 - buf;
- out:
up_read(&fw_device_rwsem);
return ret;
group->groups[0] = &group->group;
group->groups[1] = NULL;
group->group.attrs = group->attrs;
- dev->groups = group->groups;
+ dev->groups = (const struct attribute_group **) group->groups;
}
static ssize_t modalias_show(struct device *dev,
return ret;
}
-static int units_sprintf(char *buf, u32 *directory)
+static int units_sprintf(char *buf, const u32 *directory)
{
struct fw_csr_iterator ci;
int key, value;
return rcode;
}
-#define READ_BIB_ROM_SIZE 256
-#define READ_BIB_STACK_SIZE 16
+#define MAX_CONFIG_ROM_SIZE 256
/*
* Read the bus info block, perform a speed probe, and read all of the rest of
* the config ROM. We do all this with a cached bus generation. If the bus
- * generation changes under us, read_bus_info_block will fail and get retried.
+ * generation changes under us, read_config_rom will fail and get retried.
* It's better to start all over in this case because the node from which we
* are reading the ROM may have changed the ROM during the reset.
*/
-static int read_bus_info_block(struct fw_device *device, int generation)
+static int read_config_rom(struct fw_device *device, int generation)
{
- u32 *rom, *stack, *old_rom, *new_rom;
+ const u32 *old_rom, *new_rom;
+ u32 *rom, *stack;
u32 sp, key;
int i, end, length, ret = -1;
- rom = kmalloc(sizeof(*rom) * READ_BIB_ROM_SIZE +
- sizeof(*stack) * READ_BIB_STACK_SIZE, GFP_KERNEL);
+ rom = kmalloc(sizeof(*rom) * MAX_CONFIG_ROM_SIZE +
+ sizeof(*stack) * MAX_CONFIG_ROM_SIZE, GFP_KERNEL);
if (rom == NULL)
return -ENOMEM;
- stack = &rom[READ_BIB_ROM_SIZE];
+ stack = &rom[MAX_CONFIG_ROM_SIZE];
+ memset(rom, 0, sizeof(*rom) * MAX_CONFIG_ROM_SIZE);
device->max_speed = SCODE_100;
*/
key = stack[--sp];
i = key & 0xffffff;
- if (i >= READ_BIB_ROM_SIZE)
- /*
- * The reference points outside the standard
- * config rom area, something's fishy.
- */
+ if (WARN_ON(i >= MAX_CONFIG_ROM_SIZE))
goto out;
/* Read header quadlet for the block to get the length. */
if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE)
goto out;
end = i + (rom[i] >> 16) + 1;
- i++;
- if (end > READ_BIB_ROM_SIZE)
+ if (end > MAX_CONFIG_ROM_SIZE) {
/*
- * This block extends outside standard config
- * area (and the array we're reading it
- * into). That's broken, so ignore this
- * device.
+ * This block extends outside the config ROM which is
+ * a firmware bug. Ignore this whole block, i.e.
+ * simply set a fake block length of 0.
*/
- goto out;
+ fw_error("skipped invalid ROM block %x at %llx\n",
+ rom[i],
+ i * 4 | CSR_REGISTER_BASE | CSR_CONFIG_ROM);
+ rom[i] = 0;
+ end = i;
+ }
+ i++;
/*
* Now read in the block. If this is a directory
* block, check the entries as we read them to see if
* it references another block, and push it in that case.
*/
- while (i < end) {
+ for (; i < end; i++) {
if (read_rom(device, generation, i, &rom[i]) !=
RCODE_COMPLETE)
goto out;
- if ((key >> 30) == 3 && (rom[i] >> 30) > 1 &&
- sp < READ_BIB_STACK_SIZE)
- stack[sp++] = i + rom[i];
- i++;
+
+ if ((key >> 30) != 3 || (rom[i] >> 30) < 2)
+ continue;
+ /*
+ * Offset points outside the ROM. May be a firmware
+ * bug or an Extended ROM entry (IEEE 1212-2001 clause
+ * 7.7.18). Simply overwrite this pointer here by a
+ * fake immediate entry so that later iterators over
+ * the ROM don't have to check offsets all the time.
+ */
+ if (i + (rom[i] & 0xffffff) >= MAX_CONFIG_ROM_SIZE) {
+ fw_error("skipped unsupported ROM entry %x at %llx\n",
+ rom[i],
+ i * 4 | CSR_REGISTER_BASE | CSR_CONFIG_ROM);
+ rom[i] = 0;
+ continue;
+ }
+ stack[sp++] = i + rom[i];
}
if (length < i)
length = i;
kfree(old_rom);
ret = 0;
- device->cmc = rom[2] >> 30 & 1;
+ device->max_rec = rom[2] >> 12 & 0xf;
+ device->cmc = rom[2] >> 30 & 1;
+ device->irmc = rom[2] >> 31 & 1;
out:
kfree(rom);
if (!card->broadcast_channel_allocated)
return;
+ /*
+ * The Broadcast_Channel Valid bit is required by nodes which want to
+ * transmit on this channel. Such transmissions are practically
+ * exclusive to IP over 1394 (RFC 2734). IP capable nodes are required
+ * to be IRM capable and have a max_rec of 8 or more. We use this fact
+ * to narrow down to which nodes we send Broadcast_Channel updates.
+ */
+ if (!device->irmc || device->max_rec < 8)
+ return;
+
+ /*
+ * Some 1394-1995 nodes crash if this 1394a-2000 register is written.
+ * Perform a read test first.
+ */
if (device->bc_implemented == BC_UNKNOWN) {
rcode = fw_run_transaction(card, TCODE_READ_QUADLET_REQUEST,
device->node_id, generation, device->max_speed,
* device.
*/
- if (read_bus_info_block(device, device->generation) < 0) {
+ if (read_config_rom(device, device->generation) < 0) {
if (device->config_rom_retries < MAX_RETRIES &&
atomic_read(&device->state) == FW_DEVICE_INITIALIZING) {
device->config_rom_retries++;
};
/* Reread and compare bus info block and header of root directory */
-static int reread_bus_info_block(struct fw_device *device, int generation)
+static int reread_config_rom(struct fw_device *device, int generation)
{
u32 q;
int i;
struct fw_card *card = device->card;
int node_id = device->node_id;
- switch (reread_bus_info_block(device, device->generation)) {
+ switch (reread_config_rom(device, device->generation)) {
case REREAD_BIB_ERROR:
if (device->config_rom_retries < MAX_RETRIES / 2 &&
atomic_read(&device->state) == FW_DEVICE_INITIALIZING) {
*/
device_for_each_child(&device->device, NULL, shutdown_unit);
- if (read_bus_info_block(device, device->generation) < 0) {
+ if (read_config_rom(device, device->generation) < 0) {
if (device->config_rom_retries < MAX_RETRIES &&
atomic_read(&device->state) == FW_DEVICE_INITIALIZING) {
device->config_rom_retries++;
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff