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![Clemens Ladisch](/assets/img/avatar_default.png)
The kernel was using the vendor ID 0xd00d1e, which was inherited from the old ieee1394 driver stack. However, this ID was not registered, and invalid. Instead, use the vendor/model IDs that are now officially assigned to the kernel: https://ieee1394.wiki.kernel.org/index.php/IEEE_OUI_Assignments [stefanr: - The vendor ID 001f11 is Openmoko, Inc.'s identifier, registered at IEEE Registration Authority. - The range of model IDs 023900...0239ff are the Linux kernel 1394 subsystem's identifiers, registered at Openmoko. - Model ID 023901 is picked by the subsystem developers as firewire-core's model ID.] Signed-off-by: Clemens Ladisch <clemens@ladisch.de> Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
1300 lines
35 KiB
C
1300 lines
35 KiB
C
/*
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* 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/bug.h>
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#include <linux/completion.h>
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#include <linux/device.h>
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#include <linux/errno.h>
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#include <linux/firewire.h>
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#include <linux/firewire-constants.h>
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#include <linux/fs.h>
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#include <linux/init.h>
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#include <linux/idr.h>
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#include <linux/jiffies.h>
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include <linux/module.h>
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#include <linux/rculist.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/string.h>
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#include <linux/timer.h>
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#include <linux/types.h>
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#include <linux/workqueue.h>
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#include <asm/byteorder.h>
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#include "core.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) >> 12) & 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 HEADER_DESTINATION_IS_BROADCAST(q) \
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(((q) & HEADER_DESTINATION(0x3f)) == HEADER_DESTINATION(0x3f))
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#define PHY_PACKET_CONFIG 0x0
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#define PHY_PACKET_LINK_ON 0x1
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#define PHY_PACKET_SELF_ID 0x2
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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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/* returns 0 if the split timeout handler is already running */
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static int try_cancel_split_timeout(struct fw_transaction *t)
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{
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if (t->is_split_transaction)
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return del_timer(&t->split_timeout_timer);
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else
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return 1;
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}
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static int close_transaction(struct fw_transaction *transaction,
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struct fw_card *card, int rcode)
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{
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struct fw_transaction *t;
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unsigned long flags;
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spin_lock_irqsave(&card->lock, flags);
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list_for_each_entry(t, &card->transaction_list, link) {
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if (t == transaction) {
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if (!try_cancel_split_timeout(t)) {
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spin_unlock_irqrestore(&card->lock, flags);
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goto timed_out;
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}
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list_del_init(&t->link);
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card->tlabel_mask &= ~(1ULL << t->tlabel);
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break;
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}
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}
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spin_unlock_irqrestore(&card->lock, flags);
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if (&t->link != &card->transaction_list) {
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t->callback(card, rcode, NULL, 0, t->callback_data);
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return 0;
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}
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timed_out:
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return -ENOENT;
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}
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/*
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* Only valid for transactions that are potentially pending (ie have
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* been sent).
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*/
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int fw_cancel_transaction(struct fw_card *card,
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struct fw_transaction *transaction)
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{
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/*
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* Cancel the packet transmission if it's still queued. That
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* will call the packet transmission callback which cancels
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* the transaction.
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*/
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if (card->driver->cancel_packet(card, &transaction->packet) == 0)
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return 0;
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/*
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* If the request packet has already been sent, we need to see
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* if the transaction is still pending and remove it in that case.
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*/
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return close_transaction(transaction, card, RCODE_CANCELLED);
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}
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EXPORT_SYMBOL(fw_cancel_transaction);
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static void split_transaction_timeout_callback(unsigned long data)
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{
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struct fw_transaction *t = (struct fw_transaction *)data;
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struct fw_card *card = t->card;
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unsigned long flags;
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spin_lock_irqsave(&card->lock, flags);
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if (list_empty(&t->link)) {
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spin_unlock_irqrestore(&card->lock, flags);
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return;
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}
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list_del(&t->link);
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card->tlabel_mask &= ~(1ULL << t->tlabel);
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spin_unlock_irqrestore(&card->lock, flags);
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t->callback(card, RCODE_CANCELLED, NULL, 0, t->callback_data);
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}
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static void start_split_transaction_timeout(struct fw_transaction *t,
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struct fw_card *card)
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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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if (list_empty(&t->link) || WARN_ON(t->is_split_transaction)) {
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spin_unlock_irqrestore(&card->lock, flags);
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return;
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}
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t->is_split_transaction = true;
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mod_timer(&t->split_timeout_timer,
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jiffies + card->split_timeout_jiffies);
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spin_unlock_irqrestore(&card->lock, flags);
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}
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static void 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);
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break;
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case ACK_PENDING:
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start_split_transaction_timeout(t, card);
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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);
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break;
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case ACK_DATA_ERROR:
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close_transaction(t, card, RCODE_DATA_ERROR);
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break;
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case ACK_TYPE_ERROR:
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close_transaction(t, card, RCODE_TYPE_ERROR);
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break;
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default:
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/*
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* In this case the ack is really a juju specific
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* rcode, so just forward that to the callback.
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*/
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close_transaction(t, card, status);
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break;
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}
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}
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static void fw_fill_request(struct fw_packet *packet, int tcode, int tlabel,
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int destination_id, int source_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 == TCODE_STREAM_DATA) {
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packet->header[0] =
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HEADER_DATA_LENGTH(length) |
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destination_id |
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HEADER_TCODE(TCODE_STREAM_DATA);
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packet->header_length = 4;
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packet->payload = payload;
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packet->payload_length = length;
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goto common;
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}
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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(destination_id);
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packet->header[1] =
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HEADER_OFFSET_HIGH(offset >> 32) | HEADER_SOURCE(source_id);
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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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default:
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WARN(1, "wrong tcode %d\n", tcode);
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}
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common:
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packet->speed = speed;
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packet->generation = generation;
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packet->ack = 0;
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packet->payload_mapped = false;
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}
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static int allocate_tlabel(struct fw_card *card)
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{
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int tlabel;
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tlabel = card->current_tlabel;
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while (card->tlabel_mask & (1ULL << tlabel)) {
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tlabel = (tlabel + 1) & 0x3f;
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if (tlabel == card->current_tlabel)
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return -EBUSY;
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}
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card->current_tlabel = (tlabel + 1) & 0x3f;
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card->tlabel_mask |= 1ULL << tlabel;
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return tlabel;
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}
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/**
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* fw_send_request() - submit a request packet for transmission
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* @card: interface to send the request at
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* @t: transaction instance to which the request belongs
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* @tcode: transaction code
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* @destination_id: destination node ID, consisting of bus_ID and phy_ID
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* @generation: bus generation in which request and response are valid
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* @speed: transmission speed
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* @offset: 48bit wide offset into destination's address space
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* @payload: data payload for the request subaction
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* @length: length of the payload, in bytes
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* @callback: function to be called when the transaction is completed
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* @callback_data: data to be passed to the transaction completion callback
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*
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* Submit a request packet into the asynchronous request transmission queue.
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* Can be called from atomic context. If you prefer a blocking API, use
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* fw_run_transaction() in a context that can sleep.
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*
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* In case of lock requests, specify one of the firewire-core specific %TCODE_
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* constants instead of %TCODE_LOCK_REQUEST in @tcode.
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*
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* Make sure that the value in @destination_id is not older than the one in
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* @generation. Otherwise the request is in danger to be sent to a wrong node.
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*
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* In case of asynchronous stream packets i.e. %TCODE_STREAM_DATA, the caller
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* needs to synthesize @destination_id with fw_stream_packet_destination_id().
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* It will contain tag, channel, and sy data instead of a node ID then.
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*
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* The payload buffer at @data is going to be DMA-mapped except in case of
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* @length <= 8 or of local (loopback) requests. Hence make sure that the
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* buffer complies with the restrictions of the streaming DMA mapping API.
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* @payload must not be freed before the @callback is called.
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*
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* In case of request types without payload, @data is NULL and @length is 0.
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*
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* After the transaction is completed successfully or unsuccessfully, the
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* @callback will be called. Among its parameters is the response code which
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* is either one of the rcodes per IEEE 1394 or, in case of internal errors,
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* the firewire-core specific %RCODE_SEND_ERROR. The other firewire-core
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* specific rcodes (%RCODE_CANCELLED, %RCODE_BUSY, %RCODE_GENERATION,
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* %RCODE_NO_ACK) denote transaction timeout, busy responder, stale request
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* generation, or missing ACK respectively.
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*
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* Note some timing corner cases: fw_send_request() may complete much earlier
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* than when the request packet actually hits the wire. On the other hand,
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* transaction completion and hence execution of @callback may happen even
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* before fw_send_request() returns.
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*/
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void fw_send_request(struct fw_card *card, struct fw_transaction *t, int tcode,
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int destination_id, int generation, int speed,
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unsigned long long offset, 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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/*
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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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*/
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spin_lock_irqsave(&card->lock, flags);
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tlabel = allocate_tlabel(card);
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if (tlabel < 0) {
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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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t->node_id = destination_id;
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t->tlabel = tlabel;
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t->card = card;
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t->is_split_transaction = false;
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setup_timer(&t->split_timeout_timer,
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split_transaction_timeout_callback, (unsigned long)t);
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t->callback = callback;
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t->callback_data = callback_data;
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fw_fill_request(&t->packet, tcode, t->tlabel,
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destination_id, card->node_id, generation,
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speed, offset, payload, length);
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t->packet.callback = transmit_complete_callback;
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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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card->driver->send_request(card, &t->packet);
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}
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EXPORT_SYMBOL(fw_send_request);
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struct transaction_callback_data {
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struct completion done;
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void *payload;
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int rcode;
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};
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static void transaction_callback(struct fw_card *card, int rcode,
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void *payload, size_t length, void *data)
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{
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struct transaction_callback_data *d = data;
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if (rcode == RCODE_COMPLETE)
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memcpy(d->payload, payload, length);
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d->rcode = rcode;
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complete(&d->done);
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}
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|
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/**
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* fw_run_transaction() - send request and sleep until transaction is completed
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*
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* Returns the RCODE. See fw_send_request() for parameter documentation.
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* Unlike fw_send_request(), @data points to the payload of the request or/and
|
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* to the payload of the response. DMA mapping restrictions apply to outbound
|
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* request payloads of >= 8 bytes but not to inbound response payloads.
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*/
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int fw_run_transaction(struct fw_card *card, int tcode, int destination_id,
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int generation, int speed, unsigned long long offset,
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void *payload, size_t length)
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{
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struct transaction_callback_data d;
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struct fw_transaction t;
|
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|
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init_timer_on_stack(&t.split_timeout_timer);
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init_completion(&d.done);
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d.payload = payload;
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fw_send_request(card, &t, tcode, destination_id, generation, speed,
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offset, payload, length, transaction_callback, &d);
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wait_for_completion(&d.done);
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destroy_timer_on_stack(&t.split_timeout_timer);
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|
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return d.rcode;
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}
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EXPORT_SYMBOL(fw_run_transaction);
|
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|
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static DEFINE_MUTEX(phy_config_mutex);
|
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static DECLARE_COMPLETION(phy_config_done);
|
|
|
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static void 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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complete(&phy_config_done);
|
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}
|
|
|
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static struct fw_packet phy_config_packet = {
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.header_length = 12,
|
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.header[0] = TCODE_LINK_INTERNAL << 4,
|
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.payload_length = 0,
|
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.speed = SCODE_100,
|
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.callback = transmit_phy_packet_callback,
|
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};
|
|
|
|
void fw_send_phy_config(struct fw_card *card,
|
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int node_id, int generation, int gap_count)
|
|
{
|
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long timeout = DIV_ROUND_UP(HZ, 10);
|
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u32 data = PHY_IDENTIFIER(PHY_PACKET_CONFIG);
|
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|
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if (node_id != FW_PHY_CONFIG_NO_NODE_ID)
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data |= PHY_CONFIG_ROOT_ID(node_id);
|
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|
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if (gap_count == FW_PHY_CONFIG_CURRENT_GAP_COUNT) {
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gap_count = card->driver->read_phy_reg(card, 1);
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if (gap_count < 0)
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return;
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|
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gap_count &= 63;
|
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if (gap_count == 63)
|
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return;
|
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}
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data |= PHY_CONFIG_GAP_COUNT(gap_count);
|
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|
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mutex_lock(&phy_config_mutex);
|
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|
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phy_config_packet.header[1] = data;
|
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phy_config_packet.header[2] = ~data;
|
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phy_config_packet.generation = generation;
|
|
reinit_completion(&phy_config_done);
|
|
|
|
card->driver->send_request(card, &phy_config_packet);
|
|
wait_for_completion_timeout(&phy_config_done, timeout);
|
|
|
|
mutex_unlock(&phy_config_mutex);
|
|
}
|
|
|
|
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_rcu(handler, list, link) {
|
|
if (handler->offset < offset + length &&
|
|
offset < handler->offset + handler->length)
|
|
return handler;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static bool is_enclosing_handler(struct fw_address_handler *handler,
|
|
unsigned long long offset, size_t length)
|
|
{
|
|
return handler->offset <= offset &&
|
|
offset + length <= handler->offset + handler->length;
|
|
}
|
|
|
|
static struct fw_address_handler *lookup_enclosing_address_handler(
|
|
struct list_head *list, unsigned long long offset, size_t length)
|
|
{
|
|
struct fw_address_handler *handler;
|
|
|
|
list_for_each_entry_rcu(handler, list, link) {
|
|
if (is_enclosing_handler(handler, offset, length))
|
|
return handler;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static DEFINE_SPINLOCK(address_handler_list_lock);
|
|
static LIST_HEAD(address_handler_list);
|
|
|
|
const struct fw_address_region fw_high_memory_region =
|
|
{ .start = FW_MAX_PHYSICAL_RANGE, .end = 0xffffe0000000ULL, };
|
|
EXPORT_SYMBOL(fw_high_memory_region);
|
|
|
|
static const struct fw_address_region low_memory_region =
|
|
{ .start = 0x000000000000ULL, .end = FW_MAX_PHYSICAL_RANGE, };
|
|
|
|
#if 0
|
|
const struct fw_address_region fw_private_region =
|
|
{ .start = 0xffffe0000000ULL, .end = 0xfffff0000000ULL, };
|
|
const struct fw_address_region fw_csr_region =
|
|
{ .start = CSR_REGISTER_BASE,
|
|
.end = CSR_REGISTER_BASE | CSR_CONFIG_ROM_END, };
|
|
const struct fw_address_region fw_unit_space_region =
|
|
{ .start = 0xfffff0000900ULL, .end = 0x1000000000000ULL, };
|
|
#endif /* 0 */
|
|
|
|
static bool is_in_fcp_region(u64 offset, size_t length)
|
|
{
|
|
return offset >= (CSR_REGISTER_BASE | CSR_FCP_COMMAND) &&
|
|
offset + length <= (CSR_REGISTER_BASE | CSR_FCP_END);
|
|
}
|
|
|
|
/**
|
|
* fw_core_add_address_handler() - register for incoming requests
|
|
* @handler: callback
|
|
* @region: region in the IEEE 1212 node space address range
|
|
*
|
|
* region->start, ->end, and handler->length have to be quadlet-aligned.
|
|
*
|
|
* When a request is received that falls within the specified address range,
|
|
* the specified callback is invoked. The parameters passed to the callback
|
|
* give the details of the particular request.
|
|
*
|
|
* To be called in process context.
|
|
* Return value: 0 on success, non-zero otherwise.
|
|
*
|
|
* The start offset of the handler's address region is determined by
|
|
* fw_core_add_address_handler() and is returned in handler->offset.
|
|
*
|
|
* Address allocations are exclusive, except for the FCP registers.
|
|
*/
|
|
int fw_core_add_address_handler(struct fw_address_handler *handler,
|
|
const struct fw_address_region *region)
|
|
{
|
|
struct fw_address_handler *other;
|
|
int ret = -EBUSY;
|
|
|
|
if (region->start & 0xffff000000000003ULL ||
|
|
region->start >= region->end ||
|
|
region->end > 0x0001000000000000ULL ||
|
|
handler->length & 3 ||
|
|
handler->length == 0)
|
|
return -EINVAL;
|
|
|
|
spin_lock(&address_handler_list_lock);
|
|
|
|
handler->offset = region->start;
|
|
while (handler->offset + handler->length <= region->end) {
|
|
if (is_in_fcp_region(handler->offset, handler->length))
|
|
other = NULL;
|
|
else
|
|
other = lookup_overlapping_address_handler
|
|
(&address_handler_list,
|
|
handler->offset, handler->length);
|
|
if (other != NULL) {
|
|
handler->offset += other->length;
|
|
} else {
|
|
list_add_tail_rcu(&handler->link, &address_handler_list);
|
|
ret = 0;
|
|
break;
|
|
}
|
|
}
|
|
|
|
spin_unlock(&address_handler_list_lock);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(fw_core_add_address_handler);
|
|
|
|
/**
|
|
* fw_core_remove_address_handler() - unregister an address handler
|
|
*
|
|
* To be called in process context.
|
|
*
|
|
* When fw_core_remove_address_handler() returns, @handler->callback() is
|
|
* guaranteed to not run on any CPU anymore.
|
|
*/
|
|
void fw_core_remove_address_handler(struct fw_address_handler *handler)
|
|
{
|
|
spin_lock(&address_handler_list_lock);
|
|
list_del_rcu(&handler->link);
|
|
spin_unlock(&address_handler_list_lock);
|
|
synchronize_rcu();
|
|
}
|
|
EXPORT_SYMBOL(fw_core_remove_address_handler);
|
|
|
|
struct fw_request {
|
|
struct fw_packet response;
|
|
u32 request_header[4];
|
|
int ack;
|
|
u32 length;
|
|
u32 data[0];
|
|
};
|
|
|
|
static void free_response_callback(struct fw_packet *packet,
|
|
struct fw_card *card, int status)
|
|
{
|
|
struct fw_request *request;
|
|
|
|
request = container_of(packet, struct fw_request, response);
|
|
kfree(request);
|
|
}
|
|
|
|
int fw_get_response_length(struct fw_request *r)
|
|
{
|
|
int tcode, ext_tcode, data_length;
|
|
|
|
tcode = HEADER_GET_TCODE(r->request_header[0]);
|
|
|
|
switch (tcode) {
|
|
case TCODE_WRITE_QUADLET_REQUEST:
|
|
case TCODE_WRITE_BLOCK_REQUEST:
|
|
return 0;
|
|
|
|
case TCODE_READ_QUADLET_REQUEST:
|
|
return 4;
|
|
|
|
case TCODE_READ_BLOCK_REQUEST:
|
|
data_length = HEADER_GET_DATA_LENGTH(r->request_header[3]);
|
|
return data_length;
|
|
|
|
case TCODE_LOCK_REQUEST:
|
|
ext_tcode = HEADER_GET_EXTENDED_TCODE(r->request_header[3]);
|
|
data_length = HEADER_GET_DATA_LENGTH(r->request_header[3]);
|
|
switch (ext_tcode) {
|
|
case EXTCODE_FETCH_ADD:
|
|
case EXTCODE_LITTLE_ADD:
|
|
return data_length;
|
|
default:
|
|
return data_length / 2;
|
|
}
|
|
|
|
default:
|
|
WARN(1, "wrong tcode %d\n", tcode);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
void fw_fill_response(struct fw_packet *response, u32 *request_header,
|
|
int rcode, void *payload, size_t length)
|
|
{
|
|
int tcode, tlabel, extended_tcode, source, destination;
|
|
|
|
tcode = HEADER_GET_TCODE(request_header[0]);
|
|
tlabel = HEADER_GET_TLABEL(request_header[0]);
|
|
source = HEADER_GET_DESTINATION(request_header[0]);
|
|
destination = HEADER_GET_SOURCE(request_header[1]);
|
|
extended_tcode = HEADER_GET_EXTENDED_TCODE(request_header[3]);
|
|
|
|
response->header[0] =
|
|
HEADER_RETRY(RETRY_1) |
|
|
HEADER_TLABEL(tlabel) |
|
|
HEADER_DESTINATION(destination);
|
|
response->header[1] =
|
|
HEADER_SOURCE(source) |
|
|
HEADER_RCODE(rcode);
|
|
response->header[2] = 0;
|
|
|
|
switch (tcode) {
|
|
case TCODE_WRITE_QUADLET_REQUEST:
|
|
case TCODE_WRITE_BLOCK_REQUEST:
|
|
response->header[0] |= HEADER_TCODE(TCODE_WRITE_RESPONSE);
|
|
response->header_length = 12;
|
|
response->payload_length = 0;
|
|
break;
|
|
|
|
case TCODE_READ_QUADLET_REQUEST:
|
|
response->header[0] |=
|
|
HEADER_TCODE(TCODE_READ_QUADLET_RESPONSE);
|
|
if (payload != NULL)
|
|
response->header[3] = *(u32 *)payload;
|
|
else
|
|
response->header[3] = 0;
|
|
response->header_length = 16;
|
|
response->payload_length = 0;
|
|
break;
|
|
|
|
case TCODE_READ_BLOCK_REQUEST:
|
|
case TCODE_LOCK_REQUEST:
|
|
response->header[0] |= HEADER_TCODE(tcode + 2);
|
|
response->header[3] =
|
|
HEADER_DATA_LENGTH(length) |
|
|
HEADER_EXTENDED_TCODE(extended_tcode);
|
|
response->header_length = 16;
|
|
response->payload = payload;
|
|
response->payload_length = length;
|
|
break;
|
|
|
|
default:
|
|
WARN(1, "wrong tcode %d\n", tcode);
|
|
}
|
|
|
|
response->payload_mapped = false;
|
|
}
|
|
EXPORT_SYMBOL(fw_fill_response);
|
|
|
|
static u32 compute_split_timeout_timestamp(struct fw_card *card,
|
|
u32 request_timestamp)
|
|
{
|
|
unsigned int cycles;
|
|
u32 timestamp;
|
|
|
|
cycles = card->split_timeout_cycles;
|
|
cycles += request_timestamp & 0x1fff;
|
|
|
|
timestamp = request_timestamp & ~0x1fff;
|
|
timestamp += (cycles / 8000) << 13;
|
|
timestamp |= cycles % 8000;
|
|
|
|
return timestamp;
|
|
}
|
|
|
|
static struct fw_request *allocate_request(struct fw_card *card,
|
|
struct fw_packet *p)
|
|
{
|
|
struct fw_request *request;
|
|
u32 *data, length;
|
|
int request_tcode;
|
|
|
|
request_tcode = HEADER_GET_TCODE(p->header[0]);
|
|
switch (request_tcode) {
|
|
case TCODE_WRITE_QUADLET_REQUEST:
|
|
data = &p->header[3];
|
|
length = 4;
|
|
break;
|
|
|
|
case TCODE_WRITE_BLOCK_REQUEST:
|
|
case TCODE_LOCK_REQUEST:
|
|
data = p->payload;
|
|
length = HEADER_GET_DATA_LENGTH(p->header[3]);
|
|
break;
|
|
|
|
case TCODE_READ_QUADLET_REQUEST:
|
|
data = NULL;
|
|
length = 4;
|
|
break;
|
|
|
|
case TCODE_READ_BLOCK_REQUEST:
|
|
data = NULL;
|
|
length = HEADER_GET_DATA_LENGTH(p->header[3]);
|
|
break;
|
|
|
|
default:
|
|
fw_notice(card, "ERROR - corrupt request received - %08x %08x %08x\n",
|
|
p->header[0], p->header[1], p->header[2]);
|
|
return NULL;
|
|
}
|
|
|
|
request = kmalloc(sizeof(*request) + length, GFP_ATOMIC);
|
|
if (request == NULL)
|
|
return NULL;
|
|
|
|
request->response.speed = p->speed;
|
|
request->response.timestamp =
|
|
compute_split_timeout_timestamp(card, p->timestamp);
|
|
request->response.generation = p->generation;
|
|
request->response.ack = 0;
|
|
request->response.callback = free_response_callback;
|
|
request->ack = p->ack;
|
|
request->length = length;
|
|
if (data)
|
|
memcpy(request->data, data, length);
|
|
|
|
memcpy(request->request_header, p->header, sizeof(p->header));
|
|
|
|
return request;
|
|
}
|
|
|
|
void fw_send_response(struct fw_card *card,
|
|
struct fw_request *request, int rcode)
|
|
{
|
|
if (WARN_ONCE(!request, "invalid for FCP address handlers"))
|
|
return;
|
|
|
|
/* unified transaction or broadcast transaction: don't respond */
|
|
if (request->ack != ACK_PENDING ||
|
|
HEADER_DESTINATION_IS_BROADCAST(request->request_header[0])) {
|
|
kfree(request);
|
|
return;
|
|
}
|
|
|
|
if (rcode == RCODE_COMPLETE)
|
|
fw_fill_response(&request->response, request->request_header,
|
|
rcode, request->data,
|
|
fw_get_response_length(request));
|
|
else
|
|
fw_fill_response(&request->response, request->request_header,
|
|
rcode, NULL, 0);
|
|
|
|
card->driver->send_response(card, &request->response);
|
|
}
|
|
EXPORT_SYMBOL(fw_send_response);
|
|
|
|
/**
|
|
* fw_get_request_speed() - returns speed at which the @request was received
|
|
*/
|
|
int fw_get_request_speed(struct fw_request *request)
|
|
{
|
|
return request->response.speed;
|
|
}
|
|
EXPORT_SYMBOL(fw_get_request_speed);
|
|
|
|
static void handle_exclusive_region_request(struct fw_card *card,
|
|
struct fw_packet *p,
|
|
struct fw_request *request,
|
|
unsigned long long offset)
|
|
{
|
|
struct fw_address_handler *handler;
|
|
int tcode, destination, source;
|
|
|
|
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]);
|
|
|
|
rcu_read_lock();
|
|
handler = lookup_enclosing_address_handler(&address_handler_list,
|
|
offset, request->length);
|
|
if (handler)
|
|
handler->address_callback(card, request,
|
|
tcode, destination, source,
|
|
p->generation, offset,
|
|
request->data, request->length,
|
|
handler->callback_data);
|
|
rcu_read_unlock();
|
|
|
|
if (!handler)
|
|
fw_send_response(card, request, RCODE_ADDRESS_ERROR);
|
|
}
|
|
|
|
static void handle_fcp_region_request(struct fw_card *card,
|
|
struct fw_packet *p,
|
|
struct fw_request *request,
|
|
unsigned long long offset)
|
|
{
|
|
struct fw_address_handler *handler;
|
|
int tcode, destination, source;
|
|
|
|
if ((offset != (CSR_REGISTER_BASE | CSR_FCP_COMMAND) &&
|
|
offset != (CSR_REGISTER_BASE | CSR_FCP_RESPONSE)) ||
|
|
request->length > 0x200) {
|
|
fw_send_response(card, request, RCODE_ADDRESS_ERROR);
|
|
|
|
return;
|
|
}
|
|
|
|
tcode = HEADER_GET_TCODE(p->header[0]);
|
|
destination = HEADER_GET_DESTINATION(p->header[0]);
|
|
source = HEADER_GET_SOURCE(p->header[1]);
|
|
|
|
if (tcode != TCODE_WRITE_QUADLET_REQUEST &&
|
|
tcode != TCODE_WRITE_BLOCK_REQUEST) {
|
|
fw_send_response(card, request, RCODE_TYPE_ERROR);
|
|
|
|
return;
|
|
}
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(handler, &address_handler_list, link) {
|
|
if (is_enclosing_handler(handler, offset, request->length))
|
|
handler->address_callback(card, NULL, tcode,
|
|
destination, source,
|
|
p->generation, offset,
|
|
request->data,
|
|
request->length,
|
|
handler->callback_data);
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
fw_send_response(card, request, RCODE_COMPLETE);
|
|
}
|
|
|
|
void fw_core_handle_request(struct fw_card *card, struct fw_packet *p)
|
|
{
|
|
struct fw_request *request;
|
|
unsigned long long offset;
|
|
|
|
if (p->ack != ACK_PENDING && p->ack != ACK_COMPLETE)
|
|
return;
|
|
|
|
if (TCODE_IS_LINK_INTERNAL(HEADER_GET_TCODE(p->header[0]))) {
|
|
fw_cdev_handle_phy_packet(card, p);
|
|
return;
|
|
}
|
|
|
|
request = allocate_request(card, p);
|
|
if (request == NULL) {
|
|
/* FIXME: send statically allocated busy packet. */
|
|
return;
|
|
}
|
|
|
|
offset = ((u64)HEADER_GET_OFFSET_HIGH(p->header[1]) << 32) |
|
|
p->header[2];
|
|
|
|
if (!is_in_fcp_region(offset, request->length))
|
|
handle_exclusive_region_request(card, p, request, offset);
|
|
else
|
|
handle_fcp_region_request(card, p, request, offset);
|
|
|
|
}
|
|
EXPORT_SYMBOL(fw_core_handle_request);
|
|
|
|
void fw_core_handle_response(struct fw_card *card, struct fw_packet *p)
|
|
{
|
|
struct fw_transaction *t;
|
|
unsigned long flags;
|
|
u32 *data;
|
|
size_t data_length;
|
|
int tcode, tlabel, source, rcode;
|
|
|
|
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) {
|
|
if (t->node_id == source && t->tlabel == tlabel) {
|
|
if (!try_cancel_split_timeout(t)) {
|
|
spin_unlock_irqrestore(&card->lock, flags);
|
|
goto timed_out;
|
|
}
|
|
list_del_init(&t->link);
|
|
card->tlabel_mask &= ~(1ULL << t->tlabel);
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&card->lock, flags);
|
|
|
|
if (&t->link == &card->transaction_list) {
|
|
timed_out:
|
|
fw_notice(card, "unsolicited response (source %x, tlabel %x)\n",
|
|
source, tlabel);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* FIXME: sanity check packet, is length correct, does tcodes
|
|
* and addresses match.
|
|
*/
|
|
|
|
switch (tcode) {
|
|
case TCODE_READ_QUADLET_RESPONSE:
|
|
data = (u32 *) &p->header[3];
|
|
data_length = 4;
|
|
break;
|
|
|
|
case TCODE_WRITE_RESPONSE:
|
|
data = NULL;
|
|
data_length = 0;
|
|
break;
|
|
|
|
case TCODE_READ_BLOCK_RESPONSE:
|
|
case TCODE_LOCK_RESPONSE:
|
|
data = p->payload;
|
|
data_length = HEADER_GET_DATA_LENGTH(p->header[3]);
|
|
break;
|
|
|
|
default:
|
|
/* Should never happen, this is just to shut up gcc. */
|
|
data = NULL;
|
|
data_length = 0;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* The response handler may be executed while the request handler
|
|
* is still pending. Cancel the request handler.
|
|
*/
|
|
card->driver->cancel_packet(card, &t->packet);
|
|
|
|
t->callback(card, rcode, data, data_length, t->callback_data);
|
|
}
|
|
EXPORT_SYMBOL(fw_core_handle_response);
|
|
|
|
/**
|
|
* fw_rcode_string - convert a firewire result code to an error description
|
|
* @rcode: the result code
|
|
*/
|
|
const char *fw_rcode_string(int rcode)
|
|
{
|
|
static const char *const names[] = {
|
|
[RCODE_COMPLETE] = "no error",
|
|
[RCODE_CONFLICT_ERROR] = "conflict error",
|
|
[RCODE_DATA_ERROR] = "data error",
|
|
[RCODE_TYPE_ERROR] = "type error",
|
|
[RCODE_ADDRESS_ERROR] = "address error",
|
|
[RCODE_SEND_ERROR] = "send error",
|
|
[RCODE_CANCELLED] = "timeout",
|
|
[RCODE_BUSY] = "busy",
|
|
[RCODE_GENERATION] = "bus reset",
|
|
[RCODE_NO_ACK] = "no ack",
|
|
};
|
|
|
|
if ((unsigned int)rcode < ARRAY_SIZE(names) && names[rcode])
|
|
return names[rcode];
|
|
else
|
|
return "unknown";
|
|
}
|
|
EXPORT_SYMBOL(fw_rcode_string);
|
|
|
|
static const struct fw_address_region topology_map_region =
|
|
{ .start = CSR_REGISTER_BASE | CSR_TOPOLOGY_MAP,
|
|
.end = CSR_REGISTER_BASE | CSR_TOPOLOGY_MAP_END, };
|
|
|
|
static void handle_topology_map(struct fw_card *card, struct fw_request *request,
|
|
int tcode, int destination, int source, int generation,
|
|
unsigned long long offset, void *payload, size_t length,
|
|
void *callback_data)
|
|
{
|
|
int start;
|
|
|
|
if (!TCODE_IS_READ_REQUEST(tcode)) {
|
|
fw_send_response(card, request, RCODE_TYPE_ERROR);
|
|
return;
|
|
}
|
|
|
|
if ((offset & 3) > 0 || (length & 3) > 0) {
|
|
fw_send_response(card, request, RCODE_ADDRESS_ERROR);
|
|
return;
|
|
}
|
|
|
|
start = (offset - topology_map_region.start) / 4;
|
|
memcpy(payload, &card->topology_map[start], length);
|
|
|
|
fw_send_response(card, request, RCODE_COMPLETE);
|
|
}
|
|
|
|
static struct fw_address_handler topology_map = {
|
|
.length = 0x400,
|
|
.address_callback = handle_topology_map,
|
|
};
|
|
|
|
static const struct fw_address_region registers_region =
|
|
{ .start = CSR_REGISTER_BASE,
|
|
.end = CSR_REGISTER_BASE | CSR_CONFIG_ROM, };
|
|
|
|
static void update_split_timeout(struct fw_card *card)
|
|
{
|
|
unsigned int cycles;
|
|
|
|
cycles = card->split_timeout_hi * 8000 + (card->split_timeout_lo >> 19);
|
|
|
|
/* minimum per IEEE 1394, maximum which doesn't overflow OHCI */
|
|
cycles = clamp(cycles, 800u, 3u * 8000u);
|
|
|
|
card->split_timeout_cycles = cycles;
|
|
card->split_timeout_jiffies = DIV_ROUND_UP(cycles * HZ, 8000);
|
|
}
|
|
|
|
static void handle_registers(struct fw_card *card, struct fw_request *request,
|
|
int tcode, int destination, int source, int generation,
|
|
unsigned long long offset, void *payload, size_t length,
|
|
void *callback_data)
|
|
{
|
|
int reg = offset & ~CSR_REGISTER_BASE;
|
|
__be32 *data = payload;
|
|
int rcode = RCODE_COMPLETE;
|
|
unsigned long flags;
|
|
|
|
switch (reg) {
|
|
case CSR_PRIORITY_BUDGET:
|
|
if (!card->priority_budget_implemented) {
|
|
rcode = RCODE_ADDRESS_ERROR;
|
|
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(card, reg));
|
|
else if (tcode == TCODE_WRITE_QUADLET_REQUEST)
|
|
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->driver->write_csr(card, CSR_STATE_CLEAR,
|
|
CSR_STATE_BIT_ABDICATE);
|
|
else
|
|
rcode = RCODE_TYPE_ERROR;
|
|
break;
|
|
|
|
case CSR_SPLIT_TIMEOUT_HI:
|
|
if (tcode == TCODE_READ_QUADLET_REQUEST) {
|
|
*data = cpu_to_be32(card->split_timeout_hi);
|
|
} else if (tcode == TCODE_WRITE_QUADLET_REQUEST) {
|
|
spin_lock_irqsave(&card->lock, flags);
|
|
card->split_timeout_hi = be32_to_cpu(*data) & 7;
|
|
update_split_timeout(card);
|
|
spin_unlock_irqrestore(&card->lock, flags);
|
|
} else {
|
|
rcode = RCODE_TYPE_ERROR;
|
|
}
|
|
break;
|
|
|
|
case CSR_SPLIT_TIMEOUT_LO:
|
|
if (tcode == TCODE_READ_QUADLET_REQUEST) {
|
|
*data = cpu_to_be32(card->split_timeout_lo);
|
|
} else if (tcode == TCODE_WRITE_QUADLET_REQUEST) {
|
|
spin_lock_irqsave(&card->lock, flags);
|
|
card->split_timeout_lo =
|
|
be32_to_cpu(*data) & 0xfff80000;
|
|
update_split_timeout(card);
|
|
spin_unlock_irqrestore(&card->lock, flags);
|
|
} else {
|
|
rcode = RCODE_TYPE_ERROR;
|
|
}
|
|
break;
|
|
|
|
case CSR_MAINT_UTILITY:
|
|
if (tcode == TCODE_READ_QUADLET_REQUEST)
|
|
*data = card->maint_utility_register;
|
|
else if (tcode == TCODE_WRITE_QUADLET_REQUEST)
|
|
card->maint_utility_register = *data;
|
|
else
|
|
rcode = RCODE_TYPE_ERROR;
|
|
break;
|
|
|
|
case CSR_BROADCAST_CHANNEL:
|
|
if (tcode == TCODE_READ_QUADLET_REQUEST)
|
|
*data = cpu_to_be32(card->broadcast_channel);
|
|
else if (tcode == TCODE_WRITE_QUADLET_REQUEST)
|
|
card->broadcast_channel =
|
|
(be32_to_cpu(*data) & BROADCAST_CHANNEL_VALID) |
|
|
BROADCAST_CHANNEL_INITIAL;
|
|
else
|
|
rcode = RCODE_TYPE_ERROR;
|
|
break;
|
|
|
|
case CSR_BUS_MANAGER_ID:
|
|
case CSR_BANDWIDTH_AVAILABLE:
|
|
case CSR_CHANNELS_AVAILABLE_HI:
|
|
case CSR_CHANNELS_AVAILABLE_LO:
|
|
/*
|
|
* FIXME: these are handled by the OHCI hardware and
|
|
* the stack never sees these request. If we add
|
|
* support for a new type of controller that doesn't
|
|
* handle this in hardware we need to deal with these
|
|
* transactions.
|
|
*/
|
|
BUG();
|
|
break;
|
|
|
|
default:
|
|
rcode = RCODE_ADDRESS_ERROR;
|
|
break;
|
|
}
|
|
|
|
fw_send_response(card, request, rcode);
|
|
}
|
|
|
|
static struct fw_address_handler registers = {
|
|
.length = 0x400,
|
|
.address_callback = handle_registers,
|
|
};
|
|
|
|
static void handle_low_memory(struct fw_card *card, struct fw_request *request,
|
|
int tcode, int destination, int source, int generation,
|
|
unsigned long long offset, void *payload, size_t length,
|
|
void *callback_data)
|
|
{
|
|
/*
|
|
* This catches requests not handled by the physical DMA unit,
|
|
* i.e., wrong transaction types or unauthorized source nodes.
|
|
*/
|
|
fw_send_response(card, request, RCODE_TYPE_ERROR);
|
|
}
|
|
|
|
static struct fw_address_handler low_memory = {
|
|
.length = FW_MAX_PHYSICAL_RANGE,
|
|
.address_callback = handle_low_memory,
|
|
};
|
|
|
|
MODULE_AUTHOR("Kristian Hoegsberg <krh@bitplanet.net>");
|
|
MODULE_DESCRIPTION("Core IEEE1394 transaction logic");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
static const u32 vendor_textual_descriptor[] = {
|
|
/* textual descriptor leaf () */
|
|
0x00060000,
|
|
0x00000000,
|
|
0x00000000,
|
|
0x4c696e75, /* L i n u */
|
|
0x78204669, /* x F i */
|
|
0x72657769, /* r e w i */
|
|
0x72650000, /* r e */
|
|
};
|
|
|
|
static const u32 model_textual_descriptor[] = {
|
|
/* model descriptor leaf () */
|
|
0x00030000,
|
|
0x00000000,
|
|
0x00000000,
|
|
0x4a756a75, /* J u j u */
|
|
};
|
|
|
|
static struct fw_descriptor vendor_id_descriptor = {
|
|
.length = ARRAY_SIZE(vendor_textual_descriptor),
|
|
.immediate = 0x03001f11,
|
|
.key = 0x81000000,
|
|
.data = vendor_textual_descriptor,
|
|
};
|
|
|
|
static struct fw_descriptor model_id_descriptor = {
|
|
.length = ARRAY_SIZE(model_textual_descriptor),
|
|
.immediate = 0x17023901,
|
|
.key = 0x81000000,
|
|
.data = model_textual_descriptor,
|
|
};
|
|
|
|
static int __init fw_core_init(void)
|
|
{
|
|
int ret;
|
|
|
|
fw_workqueue = alloc_workqueue("firewire", WQ_MEM_RECLAIM, 0);
|
|
if (!fw_workqueue)
|
|
return -ENOMEM;
|
|
|
|
ret = bus_register(&fw_bus_type);
|
|
if (ret < 0) {
|
|
destroy_workqueue(fw_workqueue);
|
|
return ret;
|
|
}
|
|
|
|
fw_cdev_major = register_chrdev(0, "firewire", &fw_device_ops);
|
|
if (fw_cdev_major < 0) {
|
|
bus_unregister(&fw_bus_type);
|
|
destroy_workqueue(fw_workqueue);
|
|
return fw_cdev_major;
|
|
}
|
|
|
|
fw_core_add_address_handler(&topology_map, &topology_map_region);
|
|
fw_core_add_address_handler(®isters, ®isters_region);
|
|
fw_core_add_address_handler(&low_memory, &low_memory_region);
|
|
fw_core_add_descriptor(&vendor_id_descriptor);
|
|
fw_core_add_descriptor(&model_id_descriptor);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit fw_core_cleanup(void)
|
|
{
|
|
unregister_chrdev(fw_cdev_major, "firewire");
|
|
bus_unregister(&fw_bus_type);
|
|
destroy_workqueue(fw_workqueue);
|
|
idr_destroy(&fw_device_idr);
|
|
}
|
|
|
|
module_init(fw_core_init);
|
|
module_exit(fw_core_cleanup);
|