720 lines
20 KiB
C
720 lines
20 KiB
C
/* -*- c-basic-offset: 8 -*-
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*
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* fw-transaction.c - core IEEE1394 transaction logic
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*
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* Copyright (C) 2004-2006 Kristian Hoegsberg <krh@bitplanet.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/pci.h>
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#include <linux/delay.h>
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#include <linux/poll.h>
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#include <linux/list.h>
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#include <linux/kthread.h>
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#include <asm/uaccess.h>
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#include <asm/semaphore.h>
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#include "fw-transaction.h"
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#include "fw-topology.h"
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#include "fw-device.h"
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#define header_pri(pri) ((pri) << 0)
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#define header_tcode(tcode) ((tcode) << 4)
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#define header_retry(retry) ((retry) << 8)
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#define header_tlabel(tlabel) ((tlabel) << 10)
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#define header_destination(destination) ((destination) << 16)
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#define header_source(source) ((source) << 16)
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#define header_rcode(rcode) ((rcode) << 12)
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#define header_offset_high(offset_high) ((offset_high) << 0)
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#define header_data_length(length) ((length) << 16)
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#define header_extended_tcode(tcode) ((tcode) << 0)
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#define header_get_tcode(q) (((q) >> 4) & 0x0f)
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#define header_get_tlabel(q) (((q) >> 10) & 0x3f)
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#define header_get_rcode(q) (((q) >> 4) & 0x0f)
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#define header_get_destination(q) (((q) >> 16) & 0xffff)
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#define header_get_source(q) (((q) >> 16) & 0xffff)
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#define header_get_offset_high(q) (((q) >> 0) & 0xffff)
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#define header_get_data_length(q) (((q) >> 16) & 0xffff)
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#define header_get_extended_tcode(q) (((q) >> 0) & 0xffff)
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#define phy_config_gap_count(gap_count) (((gap_count) << 16) | (1 << 22))
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#define phy_config_root_id(node_id) ((((node_id) & 0x3f) << 24) | (1 << 23))
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#define phy_identifier(id) ((id) << 30)
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static void
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close_transaction(struct fw_transaction *t, struct fw_card *card, int rcode,
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u32 * payload, size_t length)
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{
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unsigned long flags;
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spin_lock_irqsave(&card->lock, flags);
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card->tlabel_mask &= ~(1 << t->tlabel);
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list_del(&t->link);
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spin_unlock_irqrestore(&card->lock, flags);
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t->callback(card, rcode, payload, length, t->callback_data);
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}
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static void
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transmit_complete_callback(struct fw_packet *packet,
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struct fw_card *card, int status)
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{
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struct fw_transaction *t =
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container_of(packet, struct fw_transaction, packet);
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switch (status) {
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case ACK_COMPLETE:
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close_transaction(t, card, RCODE_COMPLETE, NULL, 0);
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break;
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case ACK_PENDING:
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t->timestamp = packet->timestamp;
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break;
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case ACK_BUSY_X:
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case ACK_BUSY_A:
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case ACK_BUSY_B:
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close_transaction(t, card, RCODE_BUSY, NULL, 0);
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break;
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case ACK_DATA_ERROR:
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case ACK_TYPE_ERROR:
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close_transaction(t, card, RCODE_SEND_ERROR, NULL, 0);
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break;
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default:
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/* FIXME: In this case, status is a negative errno,
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* corresponding to an OHCI specific transmit error
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* code. We should map that to an RCODE instead of
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* just the generic RCODE_SEND_ERROR. */
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close_transaction(t, card, RCODE_SEND_ERROR, NULL, 0);
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break;
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}
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}
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static void
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fw_fill_packet(struct fw_packet *packet, int tcode, int tlabel,
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int node_id, int generation, int speed,
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unsigned long long offset, void *payload, size_t length)
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{
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int ext_tcode;
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if (tcode > 0x10) {
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ext_tcode = tcode - 0x10;
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tcode = TCODE_LOCK_REQUEST;
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} else
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ext_tcode = 0;
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packet->header[0] =
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header_retry(RETRY_X) |
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header_tlabel(tlabel) |
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header_tcode(tcode) |
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header_destination(node_id);
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packet->header[1] =
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header_offset_high(offset >> 32) | header_source(0);
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packet->header[2] =
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offset;
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switch (tcode) {
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case TCODE_WRITE_QUADLET_REQUEST:
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packet->header[3] = *(u32 *)payload;
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packet->header_length = 16;
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packet->payload_length = 0;
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break;
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case TCODE_LOCK_REQUEST:
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case TCODE_WRITE_BLOCK_REQUEST:
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packet->header[3] =
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header_data_length(length) |
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header_extended_tcode(ext_tcode);
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packet->header_length = 16;
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packet->payload = payload;
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packet->payload_length = length;
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break;
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case TCODE_READ_QUADLET_REQUEST:
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packet->header_length = 12;
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packet->payload_length = 0;
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break;
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case TCODE_READ_BLOCK_REQUEST:
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packet->header[3] =
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header_data_length(length) |
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header_extended_tcode(ext_tcode);
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packet->header_length = 16;
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packet->payload_length = 0;
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break;
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}
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packet->speed = speed;
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packet->generation = generation;
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}
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/**
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* This function provides low-level access to the IEEE1394 transaction
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* logic. Most C programs would use either fw_read(), fw_write() or
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* fw_lock() instead - those function are convenience wrappers for
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* this function. The fw_send_request() function is primarily
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* provided as a flexible, one-stop entry point for languages bindings
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* and protocol bindings.
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*
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* FIXME: Document this function further, in particular the possible
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* values for rcode in the callback. In short, we map ACK_COMPLETE to
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* RCODE_COMPLETE, internal errors set errno and set rcode to
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* RCODE_SEND_ERROR (which is out of range for standard ieee1394
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* rcodes). All other rcodes are forwarded unchanged. For all
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* errors, payload is NULL, length is 0.
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*
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* Can not expect the callback to be called before the function
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* returns, though this does happen in some cases (ACK_COMPLETE and
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* errors).
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*
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* The payload is only used for write requests and must not be freed
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* until the callback has been called.
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*
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* @param card the card from which to send the request
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* @param tcode the tcode for this transaction. Do not use
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* TCODE_LOCK_REQUEST directly, insted use TCODE_LOCK_MASK_SWAP
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* etc. to specify tcode and ext_tcode.
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* @param node_id the destination node ID (bus ID and PHY ID concatenated)
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* @param generation the generation for which node_id is valid
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* @param speed the speed to use for sending the request
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* @param offset the 48 bit offset on the destination node
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* @param payload the data payload for the request subaction
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* @param length the length in bytes of the data to read
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* @param callback function to be called when the transaction is completed
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* @param callback_data pointer to arbitrary data, which will be
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* passed to the callback
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*/
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void
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fw_send_request(struct fw_card *card, struct fw_transaction *t,
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int tcode, int node_id, int generation, int speed,
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unsigned long long offset,
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void *payload, size_t length,
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fw_transaction_callback_t callback, void *callback_data)
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{
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unsigned long flags;
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int tlabel;
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/* Bump the flush timer up 100ms first of all so we
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* don't race with a flush timer callback. */
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mod_timer(&card->flush_timer, jiffies + DIV_ROUND_UP(HZ, 10));
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/* Allocate tlabel from the bitmap and put the transaction on
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* the list while holding the card spinlock. */
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spin_lock_irqsave(&card->lock, flags);
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tlabel = card->current_tlabel;
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if (card->tlabel_mask & (1 << tlabel)) {
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spin_unlock_irqrestore(&card->lock, flags);
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callback(card, RCODE_SEND_ERROR, NULL, 0, callback_data);
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return;
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}
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card->current_tlabel = (card->current_tlabel + 1) & 0x1f;
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card->tlabel_mask |= (1 << tlabel);
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list_add_tail(&t->link, &card->transaction_list);
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spin_unlock_irqrestore(&card->lock, flags);
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/* Initialize rest of transaction, fill out packet and send it. */
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t->node_id = node_id;
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t->tlabel = tlabel;
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t->callback = callback;
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t->callback_data = callback_data;
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fw_fill_packet(&t->packet, tcode, t->tlabel,
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node_id, generation, speed, offset, payload, length);
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t->packet.callback = transmit_complete_callback;
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card->driver->send_request(card, &t->packet);
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}
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EXPORT_SYMBOL(fw_send_request);
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static void
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transmit_phy_packet_callback(struct fw_packet *packet,
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struct fw_card *card, int status)
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{
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kfree(packet);
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}
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static void send_phy_packet(struct fw_card *card, u32 data, int generation)
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{
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struct fw_packet *packet;
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packet = kzalloc(sizeof *packet, GFP_ATOMIC);
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if (packet == NULL)
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return;
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packet->header[0] = data;
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packet->header[1] = ~data;
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packet->header_length = 8;
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packet->payload_length = 0;
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packet->speed = SCODE_100;
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packet->generation = generation;
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packet->callback = transmit_phy_packet_callback;
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card->driver->send_request(card, packet);
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}
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void fw_send_force_root(struct fw_card *card, int node_id, int generation)
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{
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u32 q;
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q = phy_identifier(PHY_PACKET_CONFIG) | phy_config_root_id(node_id);
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send_phy_packet(card, q, generation);
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}
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void fw_flush_transactions(struct fw_card *card)
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{
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struct fw_transaction *t, *next;
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struct list_head list;
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unsigned long flags;
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INIT_LIST_HEAD(&list);
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spin_lock_irqsave(&card->lock, flags);
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list_splice_init(&card->transaction_list, &list);
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card->tlabel_mask = 0;
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spin_unlock_irqrestore(&card->lock, flags);
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list_for_each_entry_safe(t, next, &list, link)
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t->callback(card, RCODE_CANCELLED, NULL, 0, t->callback_data);
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}
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static struct fw_address_handler *
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lookup_overlapping_address_handler(struct list_head *list,
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unsigned long long offset, size_t length)
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{
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struct fw_address_handler *handler;
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list_for_each_entry(handler, list, link) {
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if (handler->offset < offset + length &&
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offset < handler->offset + handler->length)
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return handler;
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}
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return NULL;
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}
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static struct fw_address_handler *
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lookup_enclosing_address_handler(struct list_head *list,
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unsigned long long offset, size_t length)
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{
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struct fw_address_handler *handler;
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list_for_each_entry(handler, list, link) {
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if (handler->offset <= offset &&
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offset + length <= handler->offset + handler->length)
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return handler;
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}
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return NULL;
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}
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static DEFINE_SPINLOCK(address_handler_lock);
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static LIST_HEAD(address_handler_list);
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const struct fw_address_region fw_low_memory_region =
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{ .start = 0x000000000000ULL, .end = 0x000100000000ULL, };
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const struct fw_address_region fw_high_memory_region =
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{ .start = 0x000100000000ULL, .end = 0xffffe0000000ULL, };
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const struct fw_address_region fw_private_region =
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{ .start = 0xffffe0000000ULL, .end = 0xfffff0000000ULL, };
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const struct fw_address_region fw_csr_region =
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{ .start = 0xfffff0000000ULL, .end = 0xfffff0000800ULL, };
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const struct fw_address_region fw_unit_space_region =
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{ .start = 0xfffff0000900ULL, .end = 0x1000000000000ULL, };
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EXPORT_SYMBOL(fw_low_memory_region);
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EXPORT_SYMBOL(fw_high_memory_region);
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EXPORT_SYMBOL(fw_private_region);
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EXPORT_SYMBOL(fw_csr_region);
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EXPORT_SYMBOL(fw_unit_space_region);
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/**
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* Allocate a range of addresses in the node space of the OHCI
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* controller. When a request is received that falls within the
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* specified address range, the specified callback is invoked. The
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* parameters passed to the callback give the details of the
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* particular request
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*/
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int
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fw_core_add_address_handler(struct fw_address_handler *handler,
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const struct fw_address_region *region)
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{
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struct fw_address_handler *other;
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unsigned long flags;
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int ret = -EBUSY;
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spin_lock_irqsave(&address_handler_lock, flags);
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handler->offset = region->start;
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while (handler->offset + handler->length <= region->end) {
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other =
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lookup_overlapping_address_handler(&address_handler_list,
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handler->offset,
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handler->length);
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if (other != NULL) {
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handler->offset += other->length;
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} else {
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list_add_tail(&handler->link, &address_handler_list);
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ret = 0;
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break;
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}
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}
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spin_unlock_irqrestore(&address_handler_lock, flags);
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return ret;
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}
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EXPORT_SYMBOL(fw_core_add_address_handler);
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/**
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* Deallocate a range of addresses allocated with fw_allocate. This
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* will call the associated callback one last time with a the special
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* tcode TCODE_DEALLOCATE, to let the client destroy the registered
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* callback data. For convenience, the callback parameters offset and
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* length are set to the start and the length respectively for the
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* deallocated region, payload is set to NULL.
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*/
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void fw_core_remove_address_handler(struct fw_address_handler *handler)
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{
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unsigned long flags;
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spin_lock_irqsave(&address_handler_lock, flags);
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list_del(&handler->link);
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spin_unlock_irqrestore(&address_handler_lock, flags);
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}
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EXPORT_SYMBOL(fw_core_remove_address_handler);
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struct fw_request {
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struct fw_packet response;
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int ack;
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u32 length;
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u32 data[0];
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};
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static void
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free_response_callback(struct fw_packet *packet,
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struct fw_card *card, int status)
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{
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struct fw_request *request;
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request = container_of(packet, struct fw_request, response);
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kfree(request);
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}
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static void
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fw_fill_response(struct fw_packet *response,
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u32 *request, u32 *data, size_t length)
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{
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int tcode, tlabel, extended_tcode, source, destination;
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tcode = header_get_tcode(request[0]);
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tlabel = header_get_tlabel(request[0]);
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source = header_get_destination(request[0]);
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destination = header_get_source(request[1]);
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extended_tcode = header_get_extended_tcode(request[3]);
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response->header[0] =
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header_retry(RETRY_1) |
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header_tlabel(tlabel) |
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header_destination(destination);
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response->header[1] = header_source(source);
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response->header[2] = 0;
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switch (tcode) {
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case TCODE_WRITE_QUADLET_REQUEST:
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case TCODE_WRITE_BLOCK_REQUEST:
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response->header[0] |= header_tcode(TCODE_WRITE_RESPONSE);
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response->header_length = 12;
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response->payload_length = 0;
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break;
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case TCODE_READ_QUADLET_REQUEST:
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response->header[0] |=
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header_tcode(TCODE_READ_QUADLET_RESPONSE);
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response->header[3] = 0;
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response->header_length = 16;
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response->payload_length = 0;
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break;
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case TCODE_READ_BLOCK_REQUEST:
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case TCODE_LOCK_REQUEST:
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response->header[0] |= header_tcode(tcode + 2);
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response->header[3] =
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header_data_length(length) |
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header_extended_tcode(extended_tcode);
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response->header_length = 16;
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response->payload = data;
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response->payload_length = length;
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break;
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default:
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BUG();
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return;
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}
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}
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static struct fw_request *
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allocate_request(u32 *header, int ack,
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int speed, int timestamp, int generation)
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{
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struct fw_request *request;
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u32 *data, length;
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int request_tcode;
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request_tcode = header_get_tcode(header[0]);
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switch (request_tcode) {
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case TCODE_WRITE_QUADLET_REQUEST:
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data = &header[3];
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length = 4;
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break;
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case TCODE_WRITE_BLOCK_REQUEST:
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case TCODE_LOCK_REQUEST:
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data = &header[4];
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length = header_get_data_length(header[3]);
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break;
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case TCODE_READ_QUADLET_REQUEST:
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data = NULL;
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length = 4;
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break;
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case TCODE_READ_BLOCK_REQUEST:
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data = NULL;
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length = header_get_data_length(header[3]);
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break;
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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);
|