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/*
* Copyright (C) 2005-2007 Kristian Hoegsberg <krh@bitplanet.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <linux/bug.h>
#include <linux/completion.h>
#include <linux/crc-itu-t.h>
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/firewire.h>
#include <linux/firewire-constants.h>
#include <linux/jiffies.h>
#include <linux/kernel.h>
#include <linux/kref.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/spinlock.h>
#include <linux/workqueue.h>
#include <linux/atomic.h>
#include <asm/byteorder.h>
#include "core.h"
#define define_fw_printk_level(func, kern_level) \
void func(const struct fw_card *card, const char *fmt, ...) \
{ \
struct va_format vaf; \
va_list args; \
\
va_start(args, fmt); \
vaf.fmt = fmt; \
vaf.va = &args; \
printk(kern_level KBUILD_MODNAME " %s: %pV", \
dev_name(card->device), &vaf); \
va_end(args); \
}
define_fw_printk_level(fw_err, KERN_ERR);
define_fw_printk_level(fw_notice, KERN_NOTICE);
int fw_compute_block_crc(__be32 *block)
{
int length;
u16 crc;
length = (be32_to_cpu(block[0]) >> 16) & 0xff;
crc = crc_itu_t(0, (u8 *)&block[1], length * 4);
*block |= cpu_to_be32(crc);
return length;
}
static DEFINE_MUTEX(card_mutex);
static LIST_HEAD(card_list);
static LIST_HEAD(descriptor_list);
static int descriptor_count;
static __be32 tmp_config_rom[256];
/* ROM header, bus info block, root dir header, capabilities = 7 quadlets */
static size_t config_rom_length = 1 + 4 + 1 + 1;
#define BIB_CRC(v) ((v) << 0)
#define BIB_CRC_LENGTH(v) ((v) << 16)
#define BIB_INFO_LENGTH(v) ((v) << 24)
#define BIB_BUS_NAME 0x31333934 /* "1394" */
#define BIB_LINK_SPEED(v) ((v) << 0)
#define BIB_GENERATION(v) ((v) << 4)
#define BIB_MAX_ROM(v) ((v) << 8)
#define BIB_MAX_RECEIVE(v) ((v) << 12)
#define BIB_CYC_CLK_ACC(v) ((v) << 16)
#define BIB_PMC ((1) << 27)
#define BIB_BMC ((1) << 28)
#define BIB_ISC ((1) << 29)
#define BIB_CMC ((1) << 30)
#define BIB_IRMC ((1) << 31)
#define NODE_CAPABILITIES 0x0c0083c0 /* per IEEE 1394 clause 8.3.2.6.5.2 */
/*
* IEEE-1394 specifies a default SPLIT_TIMEOUT value of 800 cycles (100 ms),
* but we have to make it longer because there are many devices whose firmware
* is just too slow for that.
*/
#define DEFAULT_SPLIT_TIMEOUT (2 * 8000)
#define CANON_OUI 0x000085
static void generate_config_rom(struct fw_card *card, __be32 *config_rom)
{
struct fw_descriptor *desc;
int i, j, k, length;
/*
* Initialize contents of config rom buffer. On the OHCI
* controller, block reads to the config rom accesses the host
* memory, but quadlet read access the hardware bus info block
* registers. That's just crack, but it means we should make
* sure the contents of bus info block in host memory matches
* the version stored in the OHCI registers.
*/
config_rom[0] = cpu_to_be32(
BIB_CRC_LENGTH(4) | BIB_INFO_LENGTH(4) | BIB_CRC(0));
config_rom[1] = cpu_to_be32(BIB_BUS_NAME);
config_rom[2] = cpu_to_be32(
BIB_LINK_SPEED(card->link_speed) |
BIB_GENERATION(card->config_rom_generation++ % 14 + 2) |
BIB_MAX_ROM(2) |
BIB_MAX_RECEIVE(card->max_receive) |
BIB_BMC | BIB_ISC | BIB_CMC | BIB_IRMC);
config_rom[3] = cpu_to_be32(card->guid >> 32);
config_rom[4] = cpu_to_be32(card->guid);
/* Generate root directory. */
config_rom[6] = cpu_to_be32(NODE_CAPABILITIES);
i = 7;
j = 7 + descriptor_count;
/* Generate root directory entries for descriptors. */
list_for_each_entry (desc, &descriptor_list, link) {
if (desc->immediate > 0)
config_rom[i++] = cpu_to_be32(desc->immediate);
config_rom[i] = cpu_to_be32(desc->key | (j - i));
i++;
j += desc->length;
}
/* Update root directory length. */
config_rom[5] = cpu_to_be32((i - 5 - 1) << 16);
/* End of root directory, now copy in descriptors. */
list_for_each_entry (desc, &descriptor_list, link) {
for (k = 0; k < desc->length; k++)
config_rom[i + k] = cpu_to_be32(desc->data[k]);
i += desc->length;
}
/* Calculate CRCs for all blocks in the config rom. This
* assumes that CRC length and info length are identical for
* the bus info block, which is always the case for this
* implementation. */
for (i = 0; i < j; i += length + 1)
length = fw_compute_block_crc(config_rom + i);
WARN_ON(j != config_rom_length);
}
static void update_config_roms(void)
{
struct fw_card *card;
list_for_each_entry (card, &card_list, link) {
generate_config_rom(card, tmp_config_rom);
card->driver->set_config_rom(card, tmp_config_rom,
config_rom_length);
}
}
static size_t required_space(struct fw_descriptor *desc)
{
/* descriptor + entry into root dir + optional immediate entry */
return desc->length + 1 + (desc->immediate > 0 ? 1 : 0);
}
int fw_core_add_descriptor(struct fw_descriptor *desc)
{
size_t i;
int ret;
/*
* Check descriptor is valid; the length of all blocks in the
* descriptor has to add up to exactly the length of the
* block.
*/
i = 0;
while (i < desc->length)
i += (desc->data[i] >> 16) + 1;
if (i != desc->length)
return -EINVAL;
mutex_lock(&card_mutex);
if (config_rom_length + required_space(desc) > 256) {
ret = -EBUSY;
} else {
list_add_tail(&desc->link, &descriptor_list);
config_rom_length += required_space(desc);
descriptor_count++;
if (desc->immediate > 0)
descriptor_count++;
update_config_roms();
ret = 0;
}
mutex_unlock(&card_mutex);
return ret;
}
EXPORT_SYMBOL(fw_core_add_descriptor);
void fw_core_remove_descriptor(struct fw_descriptor *desc)
{
mutex_lock(&card_mutex);
list_del(&desc->link);
config_rom_length -= required_space(desc);
descriptor_count--;
if (desc->immediate > 0)
descriptor_count--;
update_config_roms();
mutex_unlock(&card_mutex);
}
EXPORT_SYMBOL(fw_core_remove_descriptor);
static int reset_bus(struct fw_card *card, bool short_reset)
{
int reg = short_reset ? 5 : 1;
int bit =
|