}
/**
- * 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.
+ * fw_send_request() - submit a request packet for transmission
+ * @card: interface to send the request at
+ * @t: transaction instance to which the request belongs
+ * @tcode: transaction code
+ * @destination_id: destination node ID, consisting of bus_ID and phy_ID
+ * @generation: bus generation in which request and response are valid
+ * @speed: transmission speed
+ * @offset: 48bit wide offset into destination's address space
+ * @payload: data payload for the request subaction
+ * @length: length of the payload, in bytes
+ * @callback: function to be called when the transaction is completed
+ * @callback_data: data to be passed to the transaction completion callback
*
- * 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.
+ * Submit a request packet into the asynchronous request transmission queue.
+ * Can be called from atomic context. If you prefer a blocking API, use
+ * fw_run_transaction() in a context that can sleep.
*
- * Can not expect the callback to be called before the function
- * returns, though this does happen in some cases (ACK_COMPLETE and
- * errors).
+ * In case of lock requests, specify one of the firewire-core specific %TCODE_
+ * constants instead of %TCODE_LOCK_REQUEST in @tcode.
*
- * The payload is only used for write requests and must not be freed
- * until the callback has been called.
+ * Make sure that the value in @destination_id is not older than the one in
+ * @generation. Otherwise the request is in danger to be sent to a wrong node.
*
- * @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
+ * In case of asynchronous stream packets i.e. %TCODE_STREAM_DATA, the caller
* needs to synthesize @destination_id with fw_stream_packet_destination_id().
+ * It will contain tag, channel, and sy data instead of a node ID then.
+ *
+ * The payload buffer at @data is going to be DMA-mapped except in case of
+ * quadlet-sized payload or of local (loopback) requests. Hence make sure that
+ * the buffer complies with the restrictions for DMA-mapped memory. The
+ * @payload must not be freed before the @callback is called.
+ *
+ * In case of request types without payload, @data is NULL and @length is 0.
+ *
+ * After the transaction is completed successfully or unsuccessfully, the
+ * @callback will be called. Among its parameters is the response code which
+ * is either one of the rcodes per IEEE 1394 or, in case of internal errors,
+ * the firewire-core specific %RCODE_SEND_ERROR.
+ *
+ * Note some timing corner cases: fw_send_request() may complete much earlier
+ * than when the request packet actually hits the wire. On the other hand,
+ * transaction completion and hence execution of @callback may happen even
+ * before fw_send_request() returns.
*/
void fw_send_request(struct fw_card *card, struct fw_transaction *t, int tcode,
int destination_id, int generation, int speed,
}
/**
- * fw_run_transaction - send request and sleep until transaction is completed
+ * fw_run_transaction() - send request and sleep until transaction is completed
*
- * Returns the RCODE.
+ * Returns the RCODE. See fw_send_request() for parameter documentation.
+ * Unlike fw_send_request(), @data points to the payload of the request or/and
+ * to the payload of the response.
*/
int fw_run_transaction(struct fw_card *card, int tcode, int destination_id,
int generation, int speed, unsigned long long offset,
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);
+ u32 data = PHY_IDENTIFIER(PHY_PACKET_CONFIG);
+
+ if (node_id != FW_PHY_CONFIG_NO_NODE_ID)
+ data |= PHY_CONFIG_ROOT_ID(node_id);
+
+ if (gap_count == FW_PHY_CONFIG_CURRENT_GAP_COUNT) {
+ gap_count = card->driver->read_phy_reg(card, 1);
+ if (gap_count < 0)
+ return;
+
+ gap_count &= 63;
+ if (gap_count == 63)
+ return;
+ }
+ data |= PHY_CONFIG_GAP_COUNT(gap_count);
mutex_lock(&phy_config_mutex);
}
/**
- * fw_core_add_address_handler - register for incoming requests
- * @handler: callback
- * @region: region in the IEEE 1212 node space address range
+ * 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.
*
EXPORT_SYMBOL(fw_core_add_address_handler);
/**
- * fw_core_remove_address_handler - unregister an 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;
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]);
+ tcode = HEADER_GET_TCODE(p->header[0]);
+ if (tcode == TCODE_LOCK_REQUEST)
+ tcode = 0x10 + HEADER_GET_EXTENDED_TCODE(p->header[3]);
spin_lock_irqsave(&address_handler_lock, flags);
handler = lookup_enclosing_address_handler(&address_handler_list,
else
handler->address_callback(card, request,
tcode, destination, source,
- p->generation, p->speed, offset,
+ p->generation, offset,
request->data, request->length,
handler->callback_data);
}
if (is_enclosing_handler(handler, offset, request->length))
handler->address_callback(card, NULL, tcode,
destination, source,
- p->generation, p->speed,
- offset, request->data,
+ p->generation, offset,
+ request->data,
request->length,
handler->callback_data);
}
unsigned long flags;
u32 *data;
size_t data_length;
- int tcode, tlabel, destination, source, rcode;
+ int tcode, tlabel, 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]);
+ tcode = HEADER_GET_TCODE(p->header[0]);
+ tlabel = HEADER_GET_TLABEL(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) {
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)
+ unsigned long long offset, void *payload, size_t length,
+ void *callback_data)
{
int start;
{ .start = CSR_REGISTER_BASE,
.end = CSR_REGISTER_BASE | CSR_CONFIG_ROM, };
-static u32 read_state_register(struct fw_card *card)
-{
- u32 value;
-
- /* Bit 8 (cmstr): */
- value = card->driver->read_csr_reg(card, CSR_STATE_CLEAR);
-
- /* Bit 10 (abdicate): */
- if (card->csr_abdicate)
- value |= CSR_STATE_BIT_ABDICATE;
-
- return value;
-}
-
static void update_split_timeout(struct fw_card *card)
{
unsigned int cycles;
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)
+ unsigned long long offset, void *payload, size_t length,
+ void *callback_data)
{
int reg = offset & ~CSR_REGISTER_BASE;
__be32 *data = payload;
unsigned long flags;
switch (reg) {
- case CSR_STATE_CLEAR:
- if (tcode == TCODE_READ_QUADLET_REQUEST) {
- *data = cpu_to_be32(read_state_register(card));
- } else if (tcode == TCODE_WRITE_QUADLET_REQUEST) {
- card->driver->write_csr_reg(card, CSR_STATE_CLEAR,
- be32_to_cpu(*data));
- if (*data & cpu_to_be32(CSR_STATE_BIT_ABDICATE))
- card->csr_abdicate = false;
- } else {
- rcode = RCODE_TYPE_ERROR;
- }
- break;
-
- case CSR_STATE_SET:
- if (tcode == TCODE_READ_QUADLET_REQUEST) {
- *data = cpu_to_be32(read_state_register(card));
- } else if (tcode == TCODE_WRITE_QUADLET_REQUEST) {
- card->driver->write_csr_reg(card, CSR_STATE_SET,
- be32_to_cpu(*data));
- if (*data & cpu_to_be32(CSR_STATE_BIT_ABDICATE))
- card->csr_abdicate = true;
- } else {
- rcode = RCODE_TYPE_ERROR;
+ case CSR_PRIORITY_BUDGET:
+ if (!card->priority_budget_implemented) {
+ rcode = RCODE_ADDRESS_ERROR;
+ break;
}
- break;
+ /* else fall through */
case CSR_NODE_IDS:
/*
* per IEEE 1394-2008 8.3.22.3, not IEEE 1394.1-2004 3.2.8
* and 9.6, but interoperable with IEEE 1394.1-2004 bridges
*/
+ /* fall through */
+
+ case CSR_STATE_CLEAR:
+ case CSR_STATE_SET:
+ case CSR_CYCLE_TIME:
+ case CSR_BUS_TIME:
+ case CSR_BUSY_TIMEOUT:
if (tcode == TCODE_READ_QUADLET_REQUEST)
- *data = cpu_to_be32(card->driver->
- read_csr_reg(card, CSR_NODE_IDS));
+ *data = cpu_to_be32(card->driver->read_csr(card, reg));
else if (tcode == TCODE_WRITE_QUADLET_REQUEST)
- card->driver->write_csr_reg(card, CSR_NODE_IDS,
- be32_to_cpu(*data));
+ card->driver->write_csr(card, reg, be32_to_cpu(*data));
else
rcode = RCODE_TYPE_ERROR;
break;
case CSR_RESET_START:
if (tcode == TCODE_WRITE_QUADLET_REQUEST)
- card->csr_abdicate = false;
+ card->driver->write_csr(card, CSR_STATE_CLEAR,
+ CSR_STATE_BIT_ABDICATE);
else
rcode = RCODE_TYPE_ERROR;
break;
}
break;
- case CSR_CYCLE_TIME:
- if (TCODE_IS_READ_REQUEST(tcode) && length == 4)
- *data = cpu_to_be32(card->driver->
- read_csr_reg(card, CSR_CYCLE_TIME));
- else if (tcode == TCODE_WRITE_QUADLET_REQUEST)
- card->driver->write_csr_reg(card, CSR_CYCLE_TIME,
- be32_to_cpu(*data));
- else
- rcode = RCODE_TYPE_ERROR;
- break;
-
- case CSR_BUS_TIME:
- if (tcode == TCODE_READ_QUADLET_REQUEST)
- *data = cpu_to_be32(card->driver->
- read_csr_reg(card, CSR_BUS_TIME));
- else if (tcode == TCODE_WRITE_QUADLET_REQUEST)
- card->driver->write_csr_reg(card, CSR_BUS_TIME,
- be32_to_cpu(*data));
- else
- rcode = RCODE_TYPE_ERROR;
- break;
-
- case CSR_BUSY_TIMEOUT:
- if (tcode == TCODE_READ_QUADLET_REQUEST)
- *data = cpu_to_be32(card->driver->
- read_csr_reg(card, CSR_BUSY_TIMEOUT));
- else if (tcode == TCODE_WRITE_QUADLET_REQUEST)
- card->driver->write_csr_reg(card, CSR_BUSY_TIMEOUT,
- be32_to_cpu(*data));
- else
- rcode = RCODE_TYPE_ERROR;
- break;
-
- case CSR_PRIORITY_BUDGET:
- if (!card->priority_budget_implemented)
- rcode = RCODE_ADDRESS_ERROR;
- else if (tcode == TCODE_READ_QUADLET_REQUEST)
- *data = cpu_to_be32(card->driver->
- read_csr_reg(card, CSR_PRIORITY_BUDGET));
- else if (tcode == TCODE_WRITE_QUADLET_REQUEST)
- card->driver->write_csr_reg(card, CSR_PRIORITY_BUDGET,
- be32_to_cpu(*data));
- else
- rcode = RCODE_TYPE_ERROR;
- break;
-
case CSR_MAINT_UTILITY:
if (tcode == TCODE_READ_QUADLET_REQUEST)
*data = card->maint_utility_register;
git.openpandora.org / pandora-kernel.git / blobdiff