454 lines
12 KiB
C
454 lines
12 KiB
C
/*
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* Copyright (C) 2003-2006 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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#ifndef __fw_transaction_h
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#define __fw_transaction_h
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#include <linux/device.h>
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#include <linux/timer.h>
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#include <linux/interrupt.h>
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#include <linux/list.h>
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#include <linux/fs.h>
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#include <linux/dma-mapping.h>
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#include <linux/firewire-constants.h>
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#include <asm/atomic.h>
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#define TCODE_IS_READ_REQUEST(tcode) (((tcode) & ~1) == 4)
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#define TCODE_IS_BLOCK_PACKET(tcode) (((tcode) & 1) != 0)
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#define TCODE_IS_REQUEST(tcode) (((tcode) & 2) == 0)
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#define TCODE_IS_RESPONSE(tcode) (((tcode) & 2) != 0)
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#define TCODE_HAS_REQUEST_DATA(tcode) (((tcode) & 12) != 4)
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#define TCODE_HAS_RESPONSE_DATA(tcode) (((tcode) & 12) != 0)
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#define LOCAL_BUS 0xffc0
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#define SELFID_PORT_CHILD 0x3
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#define SELFID_PORT_PARENT 0x2
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#define SELFID_PORT_NCONN 0x1
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#define SELFID_PORT_NONE 0x0
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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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/* Bit fields _within_ the PHY registers. */
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#define PHY_LINK_ACTIVE 0x80
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#define PHY_CONTENDER 0x40
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#define PHY_BUS_RESET 0x40
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#define PHY_BUS_SHORT_RESET 0x40
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#define CSR_REGISTER_BASE 0xfffff0000000ULL
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/* register offsets relative to CSR_REGISTER_BASE */
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#define CSR_STATE_CLEAR 0x0
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#define CSR_STATE_SET 0x4
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#define CSR_NODE_IDS 0x8
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#define CSR_RESET_START 0xc
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#define CSR_SPLIT_TIMEOUT_HI 0x18
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#define CSR_SPLIT_TIMEOUT_LO 0x1c
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#define CSR_CYCLE_TIME 0x200
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#define CSR_BUS_TIME 0x204
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#define CSR_BUSY_TIMEOUT 0x210
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#define CSR_BUS_MANAGER_ID 0x21c
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#define CSR_BANDWIDTH_AVAILABLE 0x220
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#define CSR_CHANNELS_AVAILABLE 0x224
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#define CSR_CHANNELS_AVAILABLE_HI 0x224
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#define CSR_CHANNELS_AVAILABLE_LO 0x228
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#define CSR_BROADCAST_CHANNEL 0x234
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#define CSR_CONFIG_ROM 0x400
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#define CSR_CONFIG_ROM_END 0x800
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#define CSR_FCP_COMMAND 0xB00
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#define CSR_FCP_RESPONSE 0xD00
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#define CSR_FCP_END 0xF00
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#define CSR_TOPOLOGY_MAP 0x1000
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#define CSR_TOPOLOGY_MAP_END 0x1400
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#define CSR_SPEED_MAP 0x2000
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#define CSR_SPEED_MAP_END 0x3000
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#define fw_notify(s, args...) printk(KERN_NOTICE KBUILD_MODNAME ": " s, ## args)
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#define fw_error(s, args...) printk(KERN_ERR KBUILD_MODNAME ": " s, ## args)
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static inline void
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fw_memcpy_from_be32(void *_dst, void *_src, size_t size)
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{
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u32 *dst = _dst;
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__be32 *src = _src;
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int i;
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for (i = 0; i < size / 4; i++)
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dst[i] = be32_to_cpu(src[i]);
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}
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static inline void
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fw_memcpy_to_be32(void *_dst, void *_src, size_t size)
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{
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fw_memcpy_from_be32(_dst, _src, size);
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}
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struct fw_card;
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struct fw_packet;
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struct fw_node;
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struct fw_request;
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struct fw_descriptor {
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struct list_head link;
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size_t length;
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u32 immediate;
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u32 key;
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const u32 *data;
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};
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int fw_core_add_descriptor(struct fw_descriptor *desc);
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void fw_core_remove_descriptor(struct fw_descriptor *desc);
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typedef void (*fw_packet_callback_t)(struct fw_packet *packet,
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struct fw_card *card, int status);
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typedef void (*fw_transaction_callback_t)(struct fw_card *card, int rcode,
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void *data,
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size_t length,
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void *callback_data);
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/*
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* Important note: The callback must guarantee that either fw_send_response()
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* or kfree() is called on the @request.
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*/
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typedef void (*fw_address_callback_t)(struct fw_card *card,
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struct fw_request *request,
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int tcode, int destination, int source,
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int generation, int speed,
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unsigned long long offset,
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void *data, size_t length,
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void *callback_data);
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typedef void (*fw_bus_reset_callback_t)(struct fw_card *handle,
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int node_id, int generation,
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u32 *self_ids,
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int self_id_count,
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void *callback_data);
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struct fw_packet {
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int speed;
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int generation;
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u32 header[4];
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size_t header_length;
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void *payload;
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size_t payload_length;
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u32 timestamp;
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/*
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* This callback is called when the packet transmission has
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* completed; for successful transmission, the status code is
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* the ack received from the destination, otherwise it's a
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* negative errno: ENOMEM, ESTALE, ETIMEDOUT, ENODEV, EIO.
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* The callback can be called from tasklet context and thus
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* must never block.
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*/
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fw_packet_callback_t callback;
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int ack;
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struct list_head link;
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void *driver_data;
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};
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struct fw_transaction {
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int node_id; /* The generation is implied; it is always the current. */
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int tlabel;
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int timestamp;
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struct list_head link;
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struct fw_packet packet;
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/*
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* The data passed to the callback is valid only during the
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* callback.
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*/
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fw_transaction_callback_t callback;
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void *callback_data;
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};
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static inline struct fw_packet *
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fw_packet(struct list_head *l)
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{
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return list_entry(l, struct fw_packet, link);
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}
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struct fw_address_handler {
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u64 offset;
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size_t length;
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fw_address_callback_t address_callback;
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void *callback_data;
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struct list_head link;
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};
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struct fw_address_region {
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u64 start;
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u64 end;
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};
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extern const struct fw_address_region fw_high_memory_region;
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int fw_core_add_address_handler(struct fw_address_handler *handler,
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const struct fw_address_region *region);
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void fw_core_remove_address_handler(struct fw_address_handler *handler);
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void fw_fill_response(struct fw_packet *response, u32 *request_header,
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int rcode, void *payload, size_t length);
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void fw_send_response(struct fw_card *card,
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struct fw_request *request, int rcode);
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extern struct bus_type fw_bus_type;
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struct fw_card {
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const struct fw_card_driver *driver;
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struct device *device;
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atomic_t device_count;
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int node_id;
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int generation;
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int current_tlabel, tlabel_mask;
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struct list_head transaction_list;
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struct timer_list flush_timer;
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unsigned long reset_jiffies;
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unsigned long long guid;
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unsigned max_receive;
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int link_speed;
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int config_rom_generation;
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/*
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* We need to store up to 4 self ID for a maximum of 63
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* devices plus 3 words for the topology map header.
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*/
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int self_id_count;
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u32 topology_map[252 + 3];
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spinlock_t lock; /* Take this lock when handling the lists in
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* this struct. */
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struct fw_node *local_node;
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struct fw_node *root_node;
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struct fw_node *irm_node;
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int color;
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int gap_count;
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bool beta_repeaters_present;
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int index;
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struct list_head link;
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/* Work struct for BM duties. */
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struct delayed_work work;
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int bm_retries;
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int bm_generation;
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};
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/*
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* The iso packet format allows for an immediate header/payload part
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* stored in 'header' immediately after the packet info plus an
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* indirect payload part that is pointer to by the 'payload' field.
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* Applications can use one or the other or both to implement simple
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* low-bandwidth streaming (e.g. audio) or more advanced
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* scatter-gather streaming (e.g. assembling video frame automatically).
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*/
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struct fw_iso_packet {
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u16 payload_length; /* Length of indirect payload. */
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u32 interrupt : 1; /* Generate interrupt on this packet */
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u32 skip : 1; /* Set to not send packet at all. */
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u32 tag : 2;
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u32 sy : 4;
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u32 header_length : 8; /* Length of immediate header. */
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u32 header[0];
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};
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#define FW_ISO_CONTEXT_TRANSMIT 0
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#define FW_ISO_CONTEXT_RECEIVE 1
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#define FW_ISO_CONTEXT_MATCH_TAG0 1
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#define FW_ISO_CONTEXT_MATCH_TAG1 2
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#define FW_ISO_CONTEXT_MATCH_TAG2 4
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#define FW_ISO_CONTEXT_MATCH_TAG3 8
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#define FW_ISO_CONTEXT_MATCH_ALL_TAGS 15
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struct fw_iso_context;
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typedef void (*fw_iso_callback_t)(struct fw_iso_context *context,
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u32 cycle,
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size_t header_length,
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void *header,
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void *data);
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/*
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* An iso buffer is just a set of pages mapped for DMA in the
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* specified direction. Since the pages are to be used for DMA, they
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* are not mapped into the kernel virtual address space. We store the
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* DMA address in the page private. The helper function
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* fw_iso_buffer_map() will map the pages into a given vma.
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*/
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struct fw_iso_buffer {
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enum dma_data_direction direction;
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struct page **pages;
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int page_count;
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};
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struct fw_iso_context {
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struct fw_card *card;
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int type;
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int channel;
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int speed;
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size_t header_size;
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fw_iso_callback_t callback;
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void *callback_data;
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};
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int
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fw_iso_buffer_init(struct fw_iso_buffer *buffer,
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struct fw_card *card,
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int page_count,
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enum dma_data_direction direction);
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int
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fw_iso_buffer_map(struct fw_iso_buffer *buffer, struct vm_area_struct *vma);
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void
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fw_iso_buffer_destroy(struct fw_iso_buffer *buffer, struct fw_card *card);
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struct fw_iso_context *
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fw_iso_context_create(struct fw_card *card, int type,
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int channel, int speed, size_t header_size,
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fw_iso_callback_t callback, void *callback_data);
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void
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fw_iso_context_destroy(struct fw_iso_context *ctx);
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int
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fw_iso_context_queue(struct fw_iso_context *ctx,
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struct fw_iso_packet *packet,
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struct fw_iso_buffer *buffer,
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unsigned long payload);
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int
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fw_iso_context_start(struct fw_iso_context *ctx,
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int cycle, int sync, int tags);
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int
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fw_iso_context_stop(struct fw_iso_context *ctx);
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struct fw_card_driver {
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const char *name;
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/*
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* Enable the given card with the given initial config rom.
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* This function is expected to activate the card, and either
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* enable the PHY or set the link_on bit and initiate a bus
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* reset.
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*/
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int (*enable)(struct fw_card *card, u32 *config_rom, size_t length);
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int (*update_phy_reg)(struct fw_card *card, int address,
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int clear_bits, int set_bits);
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/*
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* Update the config rom for an enabled card. This function
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* should change the config rom that is presented on the bus
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* an initiate a bus reset.
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*/
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int (*set_config_rom)(struct fw_card *card,
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u32 *config_rom, size_t length);
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void (*send_request)(struct fw_card *card, struct fw_packet *packet);
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void (*send_response)(struct fw_card *card, struct fw_packet *packet);
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/* Calling cancel is valid once a packet has been submitted. */
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int (*cancel_packet)(struct fw_card *card, struct fw_packet *packet);
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/*
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* Allow the specified node ID to do direct DMA out and in of
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* host memory. The card will disable this for all node when
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* a bus reset happens, so driver need to reenable this after
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* bus reset. Returns 0 on success, -ENODEV if the card
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* doesn't support this, -ESTALE if the generation doesn't
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* match.
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*/
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int (*enable_phys_dma)(struct fw_card *card,
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int node_id, int generation);
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u64 (*get_bus_time)(struct fw_card *card);
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struct fw_iso_context *
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(*allocate_iso_context)(struct fw_card *card,
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int type, size_t header_size);
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void (*free_iso_context)(struct fw_iso_context *ctx);
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int (*start_iso)(struct fw_iso_context *ctx,
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s32 cycle, u32 sync, u32 tags);
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int (*queue_iso)(struct fw_iso_context *ctx,
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struct fw_iso_packet *packet,
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struct fw_iso_buffer *buffer,
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unsigned long payload);
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int (*stop_iso)(struct fw_iso_context *ctx);
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};
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int
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fw_core_initiate_bus_reset(struct fw_card *card, int short_reset);
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void
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fw_send_request(struct fw_card *card, struct fw_transaction *t,
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int tcode, int node_id, int generation, int speed,
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unsigned long long offset,
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void *data, size_t length,
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fw_transaction_callback_t callback, void *callback_data);
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int fw_cancel_transaction(struct fw_card *card,
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struct fw_transaction *transaction);
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void fw_flush_transactions(struct fw_card *card);
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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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* Called by the topology code to inform the device code of node
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* activity; found, lost, or updated nodes.
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*/
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void
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fw_node_event(struct fw_card *card, struct fw_node *node, int event);
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/* API used by card level drivers */
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void
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fw_card_initialize(struct fw_card *card, const struct fw_card_driver *driver,
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struct device *device);
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int
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fw_card_add(struct fw_card *card,
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u32 max_receive, u32 link_speed, u64 guid);
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void
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fw_core_remove_card(struct fw_card *card);
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void
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fw_core_handle_bus_reset(struct fw_card *card,
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int node_id, int generation,
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int self_id_count, u32 *self_ids);
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void
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fw_core_handle_request(struct fw_card *card, struct fw_packet *request);
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void
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fw_core_handle_response(struct fw_card *card, struct fw_packet *packet);
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#endif /* __fw_transaction_h */
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