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1297 lines
35 KiB
1297 lines
35 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Core IEEE1394 transaction logic |
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* |
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* Copyright (C) 2004-2006 Kristian Hoegsberg <[email protected]> |
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*/ |
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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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|
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#include <asm/byteorder.h> |
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|
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#include "core.h" |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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timed_out: |
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return -ENOENT; |
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} |
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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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|
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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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|
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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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|
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static void split_transaction_timeout_callback(struct timer_list *timer) |
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{ |
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struct fw_transaction *t = from_timer(t, timer, split_timeout_timer); |
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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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|
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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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|
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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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|
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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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|
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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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/** |
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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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/* |
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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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|
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spin_lock_irqsave(&card->lock, flags); |
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|
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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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timer_setup(&t->split_timeout_timer, |
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split_transaction_timeout_callback, 0); |
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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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|
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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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|
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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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|
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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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|
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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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* @card: card interface for this request |
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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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* |
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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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timer_setup_on_stack(&t.split_timeout_timer, NULL, 0); |
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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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|
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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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|
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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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}; |
|
|
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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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{ |
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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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if (node_id != FW_PHY_CONFIG_NO_NODE_ID) |
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data |= PHY_CONFIG_ROOT_ID(node_id); |
|
|
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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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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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mutex_lock(&phy_config_mutex); |
|
|
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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; |
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reinit_completion(&phy_config_done); |
|
|
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card->driver->send_request(card, &phy_config_packet); |
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wait_for_completion_timeout(&phy_config_done, timeout); |
|
|
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mutex_unlock(&phy_config_mutex); |
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} |
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|
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static struct fw_address_handler *lookup_overlapping_address_handler( |
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struct list_head *list, unsigned long long offset, size_t length) |
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{ |
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struct fw_address_handler *handler; |
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|
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list_for_each_entry_rcu(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 bool is_enclosing_handler(struct fw_address_handler *handler, |
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unsigned long long offset, size_t length) |
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{ |
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return handler->offset <= offset && |
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offset + length <= handler->offset + handler->length; |
|
} |
|
|
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static struct fw_address_handler *lookup_enclosing_address_handler( |
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struct list_head *list, 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_rcu(handler, list, link) { |
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if (is_enclosing_handler(handler, offset, 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_list_lock); |
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static LIST_HEAD(address_handler_list); |
|
|
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const struct fw_address_region fw_high_memory_region = |
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{ .start = FW_MAX_PHYSICAL_RANGE, .end = 0xffffe0000000ULL, }; |
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EXPORT_SYMBOL(fw_high_memory_region); |
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|
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static const struct fw_address_region low_memory_region = |
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{ .start = 0x000000000000ULL, .end = FW_MAX_PHYSICAL_RANGE, }; |
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|
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#if 0 |
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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 = CSR_REGISTER_BASE, |
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.end = CSR_REGISTER_BASE | CSR_CONFIG_ROM_END, }; |
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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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#endif /* 0 */ |
|
|
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static bool is_in_fcp_region(u64 offset, size_t length) |
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{ |
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return offset >= (CSR_REGISTER_BASE | CSR_FCP_COMMAND) && |
|
offset + length <= (CSR_REGISTER_BASE | CSR_FCP_END); |
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} |
|
|
|
/** |
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* fw_core_add_address_handler() - register for incoming requests |
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* @handler: callback |
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* @region: region in the IEEE 1212 node space address range |
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* |
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* 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 |
|
* @handler: callback |
|
* |
|
* 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[]; |
|
}; |
|
|
|
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 |
|
* @request: firewire request data |
|
*/ |
|
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; |
|
} |
|
fallthrough; |
|
|
|
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 |
|
*/ |
|
fallthrough; |
|
|
|
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 <[email protected]>"); |
|
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);
|
|
|