diff options
Diffstat (limited to 'drivers/firewire/fw-transaction.c')
| -rw-r--r-- | drivers/firewire/fw-transaction.c | 730 |
1 files changed, 730 insertions, 0 deletions
diff --git a/drivers/firewire/fw-transaction.c b/drivers/firewire/fw-transaction.c new file mode 100644 index 000000000000..c3acf7431279 --- /dev/null +++ b/drivers/firewire/fw-transaction.c @@ -0,0 +1,730 @@ +/* -*- 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" + +#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; + } +} + +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); + +struct fw_address_region fw_low_memory_region = + { 0x000000000000ull, 0x000100000000ull }; +struct fw_address_region fw_high_memory_region = + { 0x000100000000ull, 0xffffe0000000ull }; +struct fw_address_region fw_private_region = + { 0xffffe0000000ull, 0xfffff0000000ull }; +struct fw_address_region fw_csr_region = + { 0xfffff0000000ULL, 0xfffff0000800ull }; +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, + 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 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 +}; + +struct bus_type fw_bus_type = { + .name = "fw", +}; + +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); |