/* -*- c-basic-offset: 8 -*-
*
* fw-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/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/poll.h>
#include <linux/list.h>
#include <linux/kthread.h>
#include <asm/uaccess.h>
#include <asm/semaphore.h>
#include "fw-transaction.h"
#include "fw-topology.h"
#include "fw-device.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) >> 4) & 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 phy_config_gap_count(gap_count) (((gap_count) << 16) | (1 << 22))
#define phy_config_root_id(node_id) (((node_id) << 24) | (1 << 23))
#define phy_identifier(id) ((id) << 30)
static void
close_transaction(struct fw_transaction *t, struct fw_card *card, int rcode,
u32 * payload, size_t length)
{
unsigned long flags;
spin_lock_irqsave(&card->lock, flags);
card->tlabel_mask &= ~(1 << t->tlabel);
list_del(&t->link);
spin_unlock_irqrestore(&card->lock, flags);
t->callback(card, rcode, payload, length, t->callback_data);
}
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, NULL, 0);
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, NULL, 0);
break;
case ACK_DATA_ERROR:
case ACK_TYPE_ERROR:
close_transaction(t, card, RCODE_SEND_ERROR, NULL, 0);
break;
default:
/* FIXME: In this case, status is a negative errno,
* corresponding to an OHCI specific transmit error
* code. We should map that to an RCODE instead of
* just the generic RCODE_SEND_ERROR. */
close_transaction(t, card, RCODE_SEND_ERROR, NULL, 0);
break;
}
}
static void
fw_fill_packet(struct fw_packet *packet, int tcode, int tlabel,
int node_id, int generation, int speed,
unsigned long long offset, void *payload, size_t length)
{
int ext_tcode;
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(node_id | LOCAL_BUS);
packet->header[1] =
header_offset_high(offset >> 32) | header_source(0);
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;
}
packet->speed = speed;
packet->generation = generation;
}
/**
* 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, insted use TCODE_LOCK_MASK_SWAP
* etc. to specify tcode and ext_tcode.
* @param node_id the node_id of the destination node
* @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
*/
void
fw_send_request(struct fw_card *card, struct fw_transaction *t,
int tcode, int node_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 & (1 << tlabel)) {
spin_unlock_irqrestore(&card->lock, flags);
callback(card, RCODE_SEND_ERROR, NULL, 0, callback_data);
return;
}
card->current_tlabel = (card->current_tlabel + 1) & 0x1f;
card->tlabel_mask |= (1 << tlabel);
list_add_tail(&t->link, &card->transaction_list);
spin_unlock_irqrestore(&card->lock, flags);
/* Initialize rest of transaction, fill out packet and send it. */
t->node_id = node_id;
t->tlabel = tlabel;
t->callback = callback;
t->callback_data = callback_data;
fw_fill_packet(&t->packet, tcode, t->tlabel,
node_id, generation, speed, offset, payload, length);
t->packet.callback = transmit_complete_callback;
card->driver->send_request(card, &t->packet);
}
EXPORT_SYMBOL(fw_send_request);
static void
transmit_phy_packet_callback(struct fw_packet *packet,
struct fw_card *card, int status)
{
kfree(packet);
}
static void send_phy_packet(struct fw_card *card, u32 data, int generation)
{
struct fw_packet *packet;
packet = kzalloc(sizeof *packet, GFP_ATOMIC);
if (packet == NULL)
return;
packet->header[0] = data;
packet->header[1] = ~data;
packet->header_length = 8;
packet->payload_length = 0;
packet->speed = SCODE_100;
packet->generation = generation;
packet->callback = transmit_phy_packet_callback;
card->driver->send_request(card, packet);
}
void fw_send_force_root(struct fw_card *card, int node_id, int generation)
{
u32 q;
q = phy_identifier(PHY_PACKET_CONFIG) | phy_config_root_id(node_id);
send_phy_packet(card, q, generation);
}
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)
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 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 (handler->offset <= offset &&
offset + length <= handler->offset + handler->length)
return handler;
}
return NULL;
}
static DEFINE_SPINLOCK(address_handler_lock);
static LIST_HEAD(address_handler_list);
const struct fw_address_region fw_low_memory_region =
{ 0x000000000000ull, 0x000100000000ull };
const struct fw_address_region fw_high_memory_region =
{ 0x000100000000ull, 0xffffe0000000ull };
const struct fw_address_region fw_private_region =
{ 0xffffe0000000ull, 0xfffff0000000ull };
const struct fw_address_region fw_csr_region =
{ 0xfffff0000000ULL, 0xfffff0000800ull };
const struct fw_address_region fw_unit_space_region =
{ 0xfffff0000900ull, 0x1000000000000ull };
EXPORT_SYMBOL(fw_low_memory_region);
EXPORT_SYMBOL(fw_high_memory_region);
EXPORT_SYMBOL(fw_private_region);
EXPORT_SYMBOL(fw_csr_region);
EXPORT_SYMBOL(fw_unit_space_region);
/**
* Allocate a range of addresses in the node space of the OHCI
* controller. 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
*/
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;
spin_lock_irqsave(&address_handler_lock, flags);
handler->offset = region->start;
while (handler->offset + handler->length <= region->end) {
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);
/**
* Deallocate a range of addresses allocated with fw_allocate. This
* will call the associated callback one last time with a the special
* tcode TCODE_DEALLOCATE, to let the client destroy the registered
* callback data. For convenience, the callback parameters offset and
* length are set to the start and the length respectively for the
* deallocated region, payload is set to NULL.
*/
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;
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);
}
static void
fw_fill_response(struct fw_packet *response,
u32 *request, u32 *data, size_t length)
{
int tcode, tlabel, extended_tcode, source, destination;
tcode = header_get_tcode(request[0]);
tlabel = header_get_tlabel(request[0]);
source = header_get_destination(request[0]);
destination = header_get_source(request[1]);
extended_tcode = header_get_extended_tcode(request[3]);
response->header[0] =
header_retry(RETRY_1) |
header_tlabel(tlabel) |
header_destination(destination);
response->header[1] = header_source(source);
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);
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 = data;
response->payload_length = length;
break;
default:
BUG();
return;
}
}
static struct fw_request *
allocate_request(u32 *header, int ack,
int speed, int timestamp, int generation)
{
struct fw_request *request;
u32 *data, length;
int request_tcode;
request_tcode = header_get_tcode(header[0]);
switch (request_tcode) {
case TCODE_WRITE_QUADLET_REQUEST:
data = &header[3];
length = 4;
break;
case TCODE_WRITE_BLOCK_REQUEST:
case TCODE_LOCK_REQUEST:
data = &header[4];
length = header_get_data_length(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(header[3]);
break;
default:
BUG();
return NULL;
}
request = kmalloc(sizeof *request + length, GFP_ATOMIC);
if (request == NULL)
return NULL;
request->response.speed = speed;
request->response.timestamp = timestamp;
request->response.generation = generation;
request->response.callback = free_response_callback;
request->ack = ack;
request->length = length;
if (data)
memcpy(request->data, data, length);
fw_fill_response(&request->response, header, request->data, length);
return request;
}
void
fw_send_response(struct fw_card *card, struct fw_request *request, int rcode)
{
int response_tcode;
/* Broadcast packets are reported as ACK_COMPLETE, so this
* check is sufficient to ensure we don't send response to
* broadcast packets or posted writes. */
if (request->ack != ACK_PENDING)
return;
request->response.header[1] |= header_rcode(rcode);
response_tcode = header_get_tcode(request->response.header[0]);
if (rcode != RCODE_COMPLETE)
/* Clear the data_length field. */
request->response.header[3] &= 0xffff;
else if (response_tcode == TCODE_READ_QUADLET_RESPONSE)
request->response.header[3] = request->data[0];
card->driver->send_response(card, &request->response);
}
EXPORT_SYMBOL(fw_send_response);
void
fw_core_handle_request(struct fw_card *card,
int speed, int ack, int timestamp,
int generation, u32 length, u32 *header)
{
struct fw_address_handler *handler;
struct fw_request *request;
unsigned long long offset;
unsigned long flags;
int tcode, destination, source, t;
if (length > 2048) {
/* FIXME: send error response. */
return;
}
if (ack != ACK_PENDING && ack != ACK_COMPLETE)
return;
t = (timestamp & 0x1fff) + 4000;
if (t >= 8000)
t = (timestamp & ~0x1fff) + 0x2000 + t - 8000;
else
t = (timestamp & ~0x1fff) + t;
request = allocate_request(header, ack, speed, t, generation);
if (request == NULL) {
/* FIXME: send statically allocated busy packet. */
return;
}
offset =
((unsigned long long)
header_get_offset_high(header[1]) << 32) | header[2];
tcode = header_get_tcode(header[0]);
destination = header_get_destination(header[0]);
source = header_get_source(header[0]);
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,
generation, speed, offset,
request->data, request->length,
handler->callback_data);
}
EXPORT_SYMBOL(fw_core_handle_request);
void
fw_core_handle_response(struct fw_card *card,
int speed, int ack, int timestamp,
u32 length, u32 *header)
{
struct fw_transaction *t;
unsigned long flags;
u32 *data;
size_t data_length;
int tcode, tlabel, destination, source, rcode;
tcode = header_get_tcode(header[0]);
tlabel = header_get_tlabel(header[0]);
destination = header_get_destination(header[0]);
source = header_get_source(header[1]);
rcode = header_get_rcode(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\n");
return;
}
/* FIXME: sanity check packet, is length correct, does tcodes
* and addresses match. */
switch (tcode) {
case TCODE_READ_QUADLET_RESPONSE:
data = (u32 *) &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 = &header[4];
data_length = header_get_data_length(header[3]);
break;
default:
/* Should never happen, this is just to shut up gcc. */
data = NULL;
data_length = 0;
break;
}
t->callback(card, rcode, data, data_length, t->callback_data);
}
EXPORT_SYMBOL(fw_core_handle_response);
MODULE_AUTHOR("Kristian Hoegsberg <krh@bitplanet.net>");
MODULE_DESCRIPTION("Core IEEE1394 transaction logic");
MODULE_LICENSE("GPL");
static const u32 vendor_textual_descriptor_data[] = {
/* textual descriptor leaf () */
0x00080000,
0x00000000,
0x00000000,
0x4c696e75, /* L i n u */
0x78204669, /* x F i */
0x72657769, /* r e w i */
0x72652028, /* r e ( */
0x4a554a55, /* J U J U */
0x29000000, /* ) */
};
static struct fw_descriptor vendor_textual_descriptor = {
.length = ARRAY_SIZE(vendor_textual_descriptor_data),
.key = 0x81000000,
.data = vendor_textual_descriptor_data
};
static int __init fw_core_init(void)
{
int retval;
retval = bus_register(&fw_bus_type);
if (retval < 0)
return retval;
/* Add the vendor textual descriptor. */
retval = fw_core_add_descriptor(&vendor_textual_descriptor);
BUG_ON(retval < 0);
return 0;
}
static void __exit fw_core_cleanup(void)
{
bus_unregister(&fw_bus_type);
}
module_init(fw_core_init);
module_exit(fw_core_cleanup);
