Linux-2.6.33.2/drivers/firewire/core-transaction.c
/*
* Core IEEE1394 transaction logic
*
* Copyright (C) 2004-2006 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/device.h>
#include <linux/errno.h>
#include <linux/firewire.h>
#include <linux/firewire-constants.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/idr.h>
#include <linux/jiffies.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/types.h>
#include <asm/byteorder.h>
#include "core.h"
#define HEADER_PRI(pri) ((pri) << 0)
#define HEADER_TCODE(tcode) ((tcode) << 4)
#define HEADER_RETRY(retry) ((retry) << 8)
#define HEADER_TLABEL(tlabel) ((tlabel) << 10)
#define HEADER_DESTINATION(destination) ((destination) << 16)
#define HEADER_SOURCE(source) ((source) << 16)
#define HEADER_RCODE(rcode) ((rcode) << 12)
#define HEADER_OFFSET_HIGH(offset_high) ((offset_high) << 0)
#define HEADER_DATA_LENGTH(length) ((length) << 16)
#define HEADER_EXTENDED_TCODE(tcode) ((tcode) << 0)
#define HEADER_GET_TCODE(q) (((q) >> 4) & 0x0f)
#define HEADER_GET_TLABEL(q) (((q) >> 10) & 0x3f)
#define HEADER_GET_RCODE(q) (((q) >> 12) & 0x0f)
#define HEADER_GET_DESTINATION(q) (((q) >> 16) & 0xffff)
#define HEADER_GET_SOURCE(q) (((q) >> 16) & 0xffff)
#define HEADER_GET_OFFSET_HIGH(q) (((q) >> 0) & 0xffff)
#define HEADER_GET_DATA_LENGTH(q) (((q) >> 16) & 0xffff)
#define HEADER_GET_EXTENDED_TCODE(q) (((q) >> 0) & 0xffff)
#define HEADER_DESTINATION_IS_BROADCAST(q) \
(((q) & HEADER_DESTINATION(0x3f)) == HEADER_DESTINATION(0x3f))
#define PHY_PACKET_CONFIG 0x0
#define PHY_PACKET_LINK_ON 0x1
#define PHY_PACKET_SELF_ID 0x2
#define PHY_CONFIG_GAP_COUNT(gap_count) (((gap_count) << 16) | (1 << 22))
#define PHY_CONFIG_ROOT_ID(node_id) ((((node_id) & 0x3f) << 24) | (1 << 23))
#define PHY_IDENTIFIER(id) ((id) << 30)
static int close_transaction(struct fw_transaction *transaction,
struct fw_card *card, int rcode)
{
struct fw_transaction *t;
unsigned long flags;
spin_lock_irqsave(&card->lock, flags);
list_for_each_entry(t, &card->transaction_list, link) {
if (t == transaction) {
list_del(&t->link);
card->tlabel_mask &= ~(1ULL << t->tlabel);
break;
}
}
spin_unlock_irqrestore(&card->lock, flags);
if (&t->link != &card->transaction_list) {
t->callback(card, rcode, NULL, 0, t->callback_data);
return 0;
}
return -ENOENT;
}
/*
* Only valid for transactions that are potentially pending (ie have
* been sent).
*/
int fw_cancel_transaction(struct fw_card *card,
struct fw_transaction *transaction)
{
/*
* Cancel the packet transmission if it's still queued. That
* will call the packet transmission callback which cancels
* the transaction.
*/
if (card->driver->cancel_packet(card, &transaction->packet) == 0)
return 0;
/*
* If the request packet has already been sent, we need to see
* if the transaction is still pending and remove it in that case.
*/
return close_transaction(transaction, card, RCODE_CANCELLED);
}
EXPORT_SYMBOL(fw_cancel_transaction);
static void transmit_complete_callback(struct fw_packet *packet,
struct fw_card *card, int status)
{
struct fw_transaction *t =
container_of(packet, struct fw_transaction, packet);
switch (status) {
case ACK_COMPLETE:
close_transaction(t, card, RCODE_COMPLETE);
break;
case ACK_PENDING:
t->timestamp = packet->timestamp;
break;
case ACK_BUSY_X:
case ACK_BUSY_A:
case ACK_BUSY_B:
close_transaction(t, card, RCODE_BUSY);
break;
case ACK_DATA_ERROR:
close_transaction(t, card, RCODE_DATA_ERROR);
break;
case ACK_TYPE_ERROR:
close_transaction(t, card, RCODE_TYPE_ERROR);
break;
default:
/*
* In this case the ack is really a juju specific
* rcode, so just forward that to the callback.
*/
close_transaction(t, card, status);
break;
}
}
static void fw_fill_request(struct fw_packet *packet, int tcode, int tlabel,
int destination_id, int source_id, int generation, int speed,
unsigned long long offset, void *payload, size_t length)
{
int ext_tcode;
if (tcode == TCODE_STREAM_DATA) {
packet->header[0] =
HEADER_DATA_LENGTH(length) |
destination_id |
HEADER_TCODE(TCODE_STREAM_DATA);
packet->header_length = 4;
packet->payload = payload;
packet->payload_length = length;
goto common;
}
if (tcode > 0x10) {
ext_tcode = tcode & ~0x10;
tcode = TCODE_LOCK_REQUEST;
} else
ext_tcode = 0;
packet->header[0] =
HEADER_RETRY(RETRY_X) |
HEADER_TLABEL(tlabel) |
HEADER_TCODE(tcode) |
HEADER_DESTINATION(destination_id);
packet->header[1] =
HEADER_OFFSET_HIGH(offset >> 32) | HEADER_SOURCE(source_id);
packet->header[2] =
offset;
switch (tcode) {
case TCODE_WRITE_QUADLET_REQUEST:
packet->header[3] = *(u32 *)payload;
packet->header_length = 16;
packet->payload_length = 0;
break;
case TCODE_LOCK_REQUEST:
case TCODE_WRITE_BLOCK_REQUEST:
packet->header[3] =
HEADER_DATA_LENGTH(length) |
HEADER_EXTENDED_TCODE(ext_tcode);
packet->header_length = 16;
packet->payload = payload;
packet->payload_length = length;
break;
case TCODE_READ_QUADLET_REQUEST:
packet->header_length = 12;
packet->payload_length = 0;
break;
case TCODE_READ_BLOCK_REQUEST:
packet->header[3] =
HEADER_DATA_LENGTH(length) |
HEADER_EXTENDED_TCODE(ext_tcode);
packet->header_length = 16;
packet->payload_length = 0;
break;
default:
WARN(1, KERN_ERR "wrong tcode %d", tcode);
}
common:
packet->speed = speed;
packet->generation = generation;
packet->ack = 0;
packet->payload_mapped = false;
}
/**
* This function provides low-level access to the IEEE1394 transaction
* logic. Most C programs would use either fw_read(), fw_write() or
* fw_lock() instead - those function are convenience wrappers for
* this function. The fw_send_request() function is primarily
* provided as a flexible, one-stop entry point for languages bindings
* and protocol bindings.
*
* FIXME: Document this function further, in particular the possible
* values for rcode in the callback. In short, we map ACK_COMPLETE to
* RCODE_COMPLETE, internal errors set errno and set rcode to
* RCODE_SEND_ERROR (which is out of range for standard ieee1394
* rcodes). All other rcodes are forwarded unchanged. For all
* errors, payload is NULL, length is 0.
*
* Can not expect the callback to be called before the function
* returns, though this does happen in some cases (ACK_COMPLETE and
* errors).
*
* The payload is only used for write requests and must not be freed
* until the callback has been called.
*
* @param card the card from which to send the request
* @param tcode the tcode for this transaction. Do not use
* TCODE_LOCK_REQUEST directly, instead use TCODE_LOCK_MASK_SWAP
* etc. to specify tcode and ext_tcode.
* @param node_id the destination node ID (bus ID and PHY ID concatenated)
* @param generation the generation for which node_id is valid
* @param speed the speed to use for sending the request
* @param offset the 48 bit offset on the destination node
* @param payload the data payload for the request subaction
* @param length the length in bytes of the data to read
* @param callback function to be called when the transaction is completed
* @param callback_data pointer to arbitrary data, which will be
* passed to the callback
*
* In case of asynchronous stream packets i.e. TCODE_STREAM_DATA, the caller
* needs to synthesize @destination_id with fw_stream_packet_destination_id().
*/
void fw_send_request(struct fw_card *card, struct fw_transaction *t, int tcode,
int destination_id, int generation, int speed,
unsigned long long offset, void *payload, size_t length,
fw_transaction_callback_t callback, void *callback_data)
{
unsigned long flags;
int tlabel;
/*
* Bump the flush timer up 100ms first of all so we
* don't race with a flush timer callback.
*/
mod_timer(&card->flush_timer, jiffies + DIV_ROUND_UP(HZ, 10));
/*
* Allocate tlabel from the bitmap and put the transaction on
* the list while holding the card spinlock.
*/
spin_lock_irqsave(&card->lock, flags);
tlabel = card->current_tlabel;
if (card->tlabel_mask & (1ULL << tlabel)) {
spin_unlock_irqrestore(&card->lock, flags);
callback(card, RCODE_SEND_ERROR, NULL, 0, callback_data);
return;
}
card->current_tlabel = (card->current_tlabel + 1) & 0x3f;
card->tlabel_mask |= (1ULL << tlabel);
t->node_id = destination_id;
t->tlabel = tlabel;
t->callback = callback;
t->callback_data = callback_data;
fw_fill_request(&t->packet, tcode, t->tlabel,
destination_id, card->node_id, generation,
speed, offset, payload, length);
t->packet.callback = transmit_complete_callback;
list_add_tail(&t->link, &card->transaction_list);
spin_unlock_irqrestore(&card->lock, flags);
card->driver->send_request(card, &t->packet);
}
EXPORT_SYMBOL(fw_send_request);
struct transaction_callback_data {
struct completion done;
void *payload;
int rcode;
};
static void transaction_callback(struct fw_card *card, int rcode,
void *payload, size_t length, void *data)
{
struct transaction_callback_data *d = data;
if (rcode == RCODE_COMPLETE)
memcpy(d->payload, payload, length);
d->rcode = rcode;
complete(&d->done);
}
/**
* fw_run_transaction - send request and sleep until transaction is completed
*
* Returns the RCODE.
*/
int fw_run_transaction(struct fw_card *card, int tcode, int destination_id,
int generation, int speed, unsigned long long offset,
void *payload, size_t length)
{
struct transaction_callback_data d;
struct fw_transaction t;
init_completion(&d.done);
d.payload = payload;
fw_send_request(card, &t, tcode, destination_id, generation, speed,
offset, payload, length, transaction_callback, &d);
wait_for_completion(&d.done);
return d.rcode;
}
EXPORT_SYMBOL(fw_run_transaction);
static DEFINE_MUTEX(phy_config_mutex);
static DECLARE_COMPLETION(phy_config_done);
static void transmit_phy_packet_callback(struct fw_packet *packet,
struct fw_card *card, int status)
{
complete(&phy_config_done);
}
static struct fw_packet phy_config_packet = {
.header_length = 8,
.payload_length = 0,
.speed = SCODE_100,
.callback = transmit_phy_packet_callback,
};
void fw_send_phy_config(struct fw_card *card,
int node_id, int generation, int gap_count)
{
long timeout = DIV_ROUND_UP(HZ, 10);
u32 data = PHY_IDENTIFIER(PHY_PACKET_CONFIG) |
PHY_CONFIG_ROOT_ID(node_id) |
PHY_CONFIG_GAP_COUNT(gap_count);
mutex_lock(&phy_config_mutex);
phy_config_packet.header[0] = data;
phy_config_packet.header[1] = ~data;
phy_config_packet.generation = generation;
INIT_COMPLETION(phy_config_done);
card->driver->send_request(card, &phy_config_packet);
wait_for_completion_timeout(&phy_config_done, timeout);
mutex_unlock(&phy_config_mutex);
}
void fw_flush_transactions(struct fw_card *card)
{
struct fw_transaction *t, *next;
struct list_head list;
unsigned long flags;
INIT_LIST_HEAD(&list);
spin_lock_irqsave(&card->lock, flags);
list_splice_init(&card->transaction_list, &list);
card->tlabel_mask = 0;
spin_unlock_irqrestore(&card->lock, flags);
list_for_each_entry_safe(t, next, &list, link) {
card->driver->cancel_packet(card, &t->packet);
/*
* At this point cancel_packet will never call the
* transaction callback, since we just took all the
* transactions out of the list. So do it here.
*/
t->callback(card, RCODE_CANCELLED, NULL, 0, t->callback_data);
}
}
static struct fw_address_handler *lookup_overlapping_address_handler(
struct list_head *list, unsigned long long offset, size_t length)
{
struct fw_address_handler *handler;
list_for_each_entry(handler, list, link) {
if (handler->offset < offset + length &&
offset < handler->offset + handler->length)
return handler;
}
return NULL;
}
static bool is_enclosing_handler(struct fw_address_handler *handler,
unsigned long long offset, size_t length)
{
return handler->offset <= offset &&
offset + length <= handler->offset + handler->length;
}
static struct fw_address_handler *lookup_enclosing_address_handler(
struct list_head *list, unsigned long long offset, size_t length)
{
struct fw_address_handler *handler;
list_for_each_entry(handler, list, link) {
if (is_enclosing_handler(handler, offset, length))
return handler;
}
return NULL;
}
static DEFINE_SPINLOCK(address_handler_lock);
static LIST_HEAD(address_handler_list);
const struct fw_address_region fw_high_memory_region =
{ .start = 0x000100000000ULL, .end = 0xffffe0000000ULL, };
EXPORT_SYMBOL(fw_high_memory_region);
#if 0
const struct fw_address_region fw_low_memory_region =
{ .start = 0x000000000000ULL, .end = 0x000100000000ULL, };
const struct fw_address_region fw_private_region =
{ .start = 0xffffe0000000ULL, .end = 0xfffff0000000ULL, };
const struct fw_address_region fw_csr_region =
{ .start = CSR_REGISTER_BASE,
.end = CSR_REGISTER_BASE | CSR_CONFIG_ROM_END, };
const struct fw_address_region fw_unit_space_region =
{ .start = 0xfffff0000900ULL, .end = 0x1000000000000ULL, };
#endif /* 0 */
static bool is_in_fcp_region(u64 offset, size_t length)
{
return offset >= (CSR_REGISTER_BASE | CSR_FCP_COMMAND) &&
offset + length <= (CSR_REGISTER_BASE | CSR_FCP_END);
}
/**
* fw_core_add_address_handler - register for incoming requests
* @handler: callback
* @region: region in the IEEE 1212 node space address range
*
* region->start, ->end, and handler->length have to be quadlet-aligned.
*
* When a request is received that falls within the specified address range,
* the specified callback is invoked. The parameters passed to the callback
* give the details of the particular request.
*
* Return value: 0 on success, non-zero otherwise.
*
* The start offset of the handler's address region is determined by
* fw_core_add_address_handler() and is returned in handler->offset.
*
* Address allocations are exclusive, except for the FCP registers.
*/
int fw_core_add_address_handler(struct fw_address_handler *handler,
const struct fw_address_region *region)
{
struct fw_address_handler *other;
unsigned long flags;
int ret = -EBUSY;
if (region->start & 0xffff000000000003ULL ||
region->end & 0xffff000000000003ULL ||
region->start >= region->end ||
handler->length & 3 ||
handler->length == 0)
return -EINVAL;
spin_lock_irqsave(&address_handler_lock, flags);
handler->offset = region->start;
while (handler->offset + handler->length <= region->end) {
if (is_in_fcp_region(handler->offset, handler->length))
other = NULL;
else
other = lookup_overlapping_address_handler
(&address_handler_list,
handler->offset, handler->length);
if (other != NULL) {
handler->offset += other->length;
} else {
list_add_tail(&handler->link, &address_handler_list);
ret = 0;
break;
}
}
spin_unlock_irqrestore(&address_handler_lock, flags);
return ret;
}
EXPORT_SYMBOL(fw_core_add_address_handler);
/**
* fw_core_remove_address_handler - unregister an address handler
*/
void fw_core_remove_address_handler(struct fw_address_handler *handler)
{
unsigned long flags;
spin_lock_irqsave(&address_handler_lock, flags);
list_del(&handler->link);
spin_unlock_irqrestore(&address_handler_lock, flags);
}
EXPORT_SYMBOL(fw_core_remove_address_handler);
struct fw_request {
struct fw_packet response;
u32 request_header[4];
int ack;
u32 length;
u32 data[0];
};
static void free_response_callback(struct fw_packet *packet,
struct fw_card *card, int status)
{
struct fw_request *request;
request = container_of(packet, struct fw_request, response);
kfree(request);
}
void fw_fill_response(struct fw_packet *response, u32 *request_header,
int rcode, void *payload, size_t length)
{
int tcode, tlabel, extended_tcode, source, destination;
tcode = HEADER_GET_TCODE(request_header[0]);
tlabel = HEADER_GET_TLABEL(request_header[0]);
source = HEADER_GET_DESTINATION(request_header[0]);
destination = HEADER_GET_SOURCE(request_header[1]);
extended_tcode = HEADER_GET_EXTENDED_TCODE(request_header[3]);
response->header[0] =
HEADER_RETRY(RETRY_1) |
HEADER_TLABEL(tlabel) |
HEADER_DESTINATION(destination);
response->header[1] =
HEADER_SOURCE(source) |
HEADER_RCODE(rcode);
response->header[2] = 0;
switch (tcode) {
case TCODE_WRITE_QUADLET_REQUEST:
case TCODE_WRITE_BLOCK_REQUEST:
response->header[0] |= HEADER_TCODE(TCODE_WRITE_RESPONSE);
response->header_length = 12;
response->payload_length = 0;
break;
case TCODE_READ_QUADLET_REQUEST:
response->header[0] |=
HEADER_TCODE(TCODE_READ_QUADLET_RESPONSE);
if (payload != NULL)
response->header[3] = *(u32 *)payload;
else
response->header[3] = 0;
response->header_length = 16;
response->payload_length = 0;
break;
case TCODE_READ_BLOCK_REQUEST:
case TCODE_LOCK_REQUEST:
response->header[0] |= HEADER_TCODE(tcode + 2);
response->header[3] =
HEADER_DATA_LENGTH(length) |
HEADER_EXTENDED_TCODE(extended_tcode);
response->header_length = 16;
response->payload = payload;
response->payload_length = length;
break;
default:
WARN(1, KERN_ERR "wrong tcode %d", tcode);
}
response->payload_mapped = false;
}
EXPORT_SYMBOL(fw_fill_response);
static struct fw_request *allocate_request(struct fw_packet *p)
{
struct fw_request *request;
u32 *data, length;
int request_tcode, t;
request_tcode = HEADER_GET_TCODE(p->header[0]);
switch (request_tcode) {
case TCODE_WRITE_QUADLET_REQUEST:
data = &p->header[3];
length = 4;
break;
case TCODE_WRITE_BLOCK_REQUEST:
case TCODE_LOCK_REQUEST:
data = p->payload;
length = HEADER_GET_DATA_LENGTH(p->header[3]);
break;
case TCODE_READ_QUADLET_REQUEST:
data = NULL;
length = 4;
break;
case TCODE_READ_BLOCK_REQUEST:
data = NULL;
length = HEADER_GET_DATA_LENGTH(p->header[3]);
break;
default:
fw_error("ERROR - corrupt request received - %08x %08x %08x\n",
p->header[0], p->header[1], p->header[2]);
return NULL;
}
request = kmalloc(sizeof(*request) + length, GFP_ATOMIC);
if (request == NULL)
return NULL;
t = (p->timestamp & 0x1fff) + 4000;
if (t >= 8000)
t = (p->timestamp & ~0x1fff) + 0x2000 + t - 8000;
else
t = (p->timestamp & ~0x1fff) + t;
request->response.speed = p->speed;
request->response.timestamp = t;
request->response.generation = p->generation;
request->response.ack = 0;
request->response.callback = free_response_callback;
request->ack = p->ack;
request->length = length;
if (data)
memcpy(request->data, data, length);
memcpy(request->request_header, p->header, sizeof(p->header));
return request;
}
void fw_send_response(struct fw_card *card,
struct fw_request *request, int rcode)
{
if (WARN_ONCE(!request, "invalid for FCP address handlers"))
return;
/* unified transaction or broadcast transaction: don't respond */
if (request->ack != ACK_PENDING ||
HEADER_DESTINATION_IS_BROADCAST(request->request_header[0])) {
kfree(request);
return;
}
if (rcode == RCODE_COMPLETE)
fw_fill_response(&request->response, request->request_header,
rcode, request->data, request->length);
else
fw_fill_response(&request->response, request->request_header,
rcode, NULL, 0);
card->driver->send_response(card, &request->response);
}
EXPORT_SYMBOL(fw_send_response);
static void handle_exclusive_region_request(struct fw_card *card,
struct fw_packet *p,
struct fw_request *request,
unsigned long long offset)
{
struct fw_address_handler *handler;
unsigned long flags;
int tcode, destination, source;
tcode = HEADER_GET_TCODE(p->header[0]);
destination = HEADER_GET_DESTINATION(p->header[0]);
source = HEADER_GET_SOURCE(p->header[1]);
spin_lock_irqsave(&address_handler_lock, flags);
handler = lookup_enclosing_address_handler(&address_handler_list,
offset, request->length);
spin_unlock_irqrestore(&address_handler_lock, flags);
/*
* FIXME: lookup the fw_node corresponding to the sender of
* this request and pass that to the address handler instead
* of the node ID. We may also want to move the address
* allocations to fw_node so we only do this callback if the
* upper layers registered it for this node.
*/
if (handler == NULL)
fw_send_response(card, request, RCODE_ADDRESS_ERROR);
else
handler->address_callback(card, request,
tcode, destination, source,
p->generation, p->speed, offset,
request->data, request->length,
handler->callback_data);
}
static void handle_fcp_region_request(struct fw_card *card,
struct fw_packet *p,
struct fw_request *request,
unsigned long long offset)
{
struct fw_address_handler *handler;
unsigned long flags;
int tcode, destination, source;
if ((offset != (CSR_REGISTER_BASE | CSR_FCP_COMMAND) &&
offset != (CSR_REGISTER_BASE | CSR_FCP_RESPONSE)) ||
request->length > 0x200) {
fw_send_response(card, request, RCODE_ADDRESS_ERROR);
return;
}
tcode = HEADER_GET_TCODE(p->header[0]);
destination = HEADER_GET_DESTINATION(p->header[0]);
source = HEADER_GET_SOURCE(p->header[1]);
if (tcode != TCODE_WRITE_QUADLET_REQUEST &&
tcode != TCODE_WRITE_BLOCK_REQUEST) {
fw_send_response(card, request, RCODE_TYPE_ERROR);
return;
}
spin_lock_irqsave(&address_handler_lock, flags);
list_for_each_entry(handler, &address_handler_list, link) {
if (is_enclosing_handler(handler, offset, request->length))
handler->address_callback(card, NULL, tcode,
destination, source,
p->generation, p->speed,
offset, request->data,
request->length,
handler->callback_data);
}
spin_unlock_irqrestore(&address_handler_lock, flags);
fw_send_response(card, request, RCODE_COMPLETE);
}
void fw_core_handle_request(struct fw_card *card, struct fw_packet *p)
{
struct fw_request *request;
unsigned long long offset;
if (p->ack != ACK_PENDING && p->ack != ACK_COMPLETE)
return;
request = allocate_request(p);
if (request == NULL) {
/* FIXME: send statically allocated busy packet. */
return;
}
offset = ((u64)HEADER_GET_OFFSET_HIGH(p->header[1]) << 32) |
p->header[2];
if (!is_in_fcp_region(offset, request->length))
handle_exclusive_region_request(card, p, request, offset);
else
handle_fcp_region_request(card, p, request, offset);
}
EXPORT_SYMBOL(fw_core_handle_request);
void fw_core_handle_response(struct fw_card *card, struct fw_packet *p)
{
struct fw_transaction *t;
unsigned long flags;
u32 *data;
size_t data_length;
int tcode, tlabel, destination, source, rcode;
tcode = HEADER_GET_TCODE(p->header[0]);
tlabel = HEADER_GET_TLABEL(p->header[0]);
destination = HEADER_GET_DESTINATION(p->header[0]);
source = HEADER_GET_SOURCE(p->header[1]);
rcode = HEADER_GET_RCODE(p->header[1]);
spin_lock_irqsave(&card->lock, flags);
list_for_each_entry(t, &card->transaction_list, link) {
if (t->node_id == source && t->tlabel == tlabel) {
list_del(&t->link);
card->tlabel_mask &= ~(1 << t->tlabel);
break;
}
}
spin_unlock_irqrestore(&card->lock, flags);
if (&t->link == &card->transaction_list) {
fw_notify("Unsolicited response (source %x, tlabel %x)\n",
source, tlabel);
return;
}
/*
* FIXME: sanity check packet, is length correct, does tcodes
* and addresses match.
*/
switch (tcode) {
case TCODE_READ_QUADLET_RESPONSE:
data = (u32 *) &p->header[3];
data_length = 4;
break;
case TCODE_WRITE_RESPONSE:
data = NULL;
data_length = 0;
break;
case TCODE_READ_BLOCK_RESPONSE:
case TCODE_LOCK_RESPONSE:
data = p->payload;
data_length = HEADER_GET_DATA_LENGTH(p->header[3]);
break;
default:
/* Should never happen, this is just to shut up gcc. */
data = NULL;
data_length = 0;
break;
}
/*
* The response handler may be executed while the request handler
* is still pending. Cancel the request handler.
*/
card->driver->cancel_packet(card, &t->packet);
t->callback(card, rcode, data, data_length, t->callback_data);
}
EXPORT_SYMBOL(fw_core_handle_response);
static const struct fw_address_region topology_map_region =
{ .start = CSR_REGISTER_BASE | CSR_TOPOLOGY_MAP,
.end = CSR_REGISTER_BASE | CSR_TOPOLOGY_MAP_END, };
static void handle_topology_map(struct fw_card *card, struct fw_request *request,
int tcode, int destination, int source, int generation,
int speed, unsigned long long offset,
void *payload, size_t length, void *callback_data)
{
int start;
if (!TCODE_IS_READ_REQUEST(tcode)) {
fw_send_response(card, request, RCODE_TYPE_ERROR);
return;
}
if ((offset & 3) > 0 || (length & 3) > 0) {
fw_send_response(card, request, RCODE_ADDRESS_ERROR);
return;
}
start = (offset - topology_map_region.start) / 4;
memcpy(payload, &card->topology_map[start], length);
fw_send_response(card, request, RCODE_COMPLETE);
}
static struct fw_address_handler topology_map = {
.length = 0x400,
.address_callback = handle_topology_map,
};
static const struct fw_address_region registers_region =
{ .start = CSR_REGISTER_BASE,
.end = CSR_REGISTER_BASE | CSR_CONFIG_ROM, };
static void handle_registers(struct fw_card *card, struct fw_request *request,
int tcode, int destination, int source, int generation,
int speed, unsigned long long offset,
void *payload, size_t length, void *callback_data)
{
int reg = offset & ~CSR_REGISTER_BASE;
unsigned long long bus_time;
__be32 *data = payload;
int rcode = RCODE_COMPLETE;
switch (reg) {
case CSR_CYCLE_TIME:
case CSR_BUS_TIME:
if (!TCODE_IS_READ_REQUEST(tcode) || length != 4) {
rcode = RCODE_TYPE_ERROR;
break;
}
bus_time = card->driver->get_bus_time(card);
if (reg == CSR_CYCLE_TIME)
*data = cpu_to_be32(bus_time);
else
*data = cpu_to_be32(bus_time >> 25);
break;
case CSR_BROADCAST_CHANNEL:
if (tcode == TCODE_READ_QUADLET_REQUEST)
*data = cpu_to_be32(card->broadcast_channel);
else if (tcode == TCODE_WRITE_QUADLET_REQUEST)
card->broadcast_channel =
(be32_to_cpu(*data) & BROADCAST_CHANNEL_VALID) |
BROADCAST_CHANNEL_INITIAL;
else
rcode = RCODE_TYPE_ERROR;
break;
case CSR_BUS_MANAGER_ID:
case CSR_BANDWIDTH_AVAILABLE:
case CSR_CHANNELS_AVAILABLE_HI:
case CSR_CHANNELS_AVAILABLE_LO:
/*
* FIXME: these are handled by the OHCI hardware and
* the stack never sees these request. If we add
* support for a new type of controller that doesn't
* handle this in hardware we need to deal with these
* transactions.
*/
BUG();
break;
case CSR_BUSY_TIMEOUT:
/* FIXME: Implement this. */
default:
rcode = RCODE_ADDRESS_ERROR;
break;
}
fw_send_response(card, request, rcode);
}
static struct fw_address_handler registers = {
.length = 0x400,
.address_callback = handle_registers,
};
MODULE_AUTHOR("Kristian Hoegsberg <krh@bitplanet.net>");
MODULE_DESCRIPTION("Core IEEE1394 transaction logic");
MODULE_LICENSE("GPL");
static const u32 vendor_textual_descriptor[] = {
/* textual descriptor leaf () */
0x00060000,
0x00000000,
0x00000000,
0x4c696e75, /* L i n u */
0x78204669, /* x F i */
0x72657769, /* r e w i */
0x72650000, /* r e */
};
static const u32 model_textual_descriptor[] = {
/* model descriptor leaf () */
0x00030000,
0x00000000,
0x00000000,
0x4a756a75, /* J u j u */
};
static struct fw_descriptor vendor_id_descriptor = {
.length = ARRAY_SIZE(vendor_textual_descriptor),
.immediate = 0x03d00d1e,
.key = 0x81000000,
.data = vendor_textual_descriptor,
};
static struct fw_descriptor model_id_descriptor = {
.length = ARRAY_SIZE(model_textual_descriptor),
.immediate = 0x17000001,
.key = 0x81000000,
.data = model_textual_descriptor,
};
static int __init fw_core_init(void)
{
int ret;
ret = bus_register(&fw_bus_type);
if (ret < 0)
return ret;
fw_cdev_major = register_chrdev(0, "firewire", &fw_device_ops);
if (fw_cdev_major < 0) {
bus_unregister(&fw_bus_type);
return fw_cdev_major;
}
fw_core_add_address_handler(&topology_map, &topology_map_region);
fw_core_add_address_handler(®isters, ®isters_region);
fw_core_add_descriptor(&vendor_id_descriptor);
fw_core_add_descriptor(&model_id_descriptor);
return 0;
}
static void __exit fw_core_cleanup(void)
{
unregister_chrdev(fw_cdev_major, "firewire");
bus_unregister(&fw_bus_type);
idr_destroy(&fw_device_idr);
}
module_init(fw_core_init);
module_exit(fw_core_cleanup);