/* * Copyright (C) 2003-2006 Kristian Hoegsberg <krh@bitplanet.net> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software Foundation, * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #ifndef __fw_transaction_h #define __fw_transaction_h #include <linux/device.h> #include <linux/timer.h> #include <linux/interrupt.h> #include <linux/list.h> #include <linux/fs.h> #include <linux/dma-mapping.h> #include <linux/firewire-constants.h> #define TCODE_IS_READ_REQUEST(tcode) (((tcode) & ~1) == 4) #define TCODE_IS_BLOCK_PACKET(tcode) (((tcode) & 1) != 0) #define TCODE_IS_REQUEST(tcode) (((tcode) & 2) == 0) #define TCODE_IS_RESPONSE(tcode) (((tcode) & 2) != 0) #define TCODE_HAS_REQUEST_DATA(tcode) (((tcode) & 12) != 4) #define TCODE_HAS_RESPONSE_DATA(tcode) (((tcode) & 12) != 0) #define LOCAL_BUS 0xffc0 #define SELFID_PORT_CHILD 0x3 #define SELFID_PORT_PARENT 0x2 #define SELFID_PORT_NCONN 0x1 #define SELFID_PORT_NONE 0x0 #define PHY_PACKET_CONFIG 0x0 #define PHY_PACKET_LINK_ON 0x1 #define PHY_PACKET_SELF_ID 0x2 /* Bit fields _within_ the PHY registers. */ #define PHY_LINK_ACTIVE 0x80 #define PHY_CONTENDER 0x40 #define PHY_BUS_RESET 0x40 #define PHY_BUS_SHORT_RESET 0x40 #define CSR_REGISTER_BASE 0xfffff0000000ULL /* register offsets relative to CSR_REGISTER_BASE */ #define CSR_STATE_CLEAR 0x0 #define CSR_STATE_SET 0x4 #define CSR_NODE_IDS 0x8 #define CSR_RESET_START 0xc #define CSR_SPLIT_TIMEOUT_HI 0x18 #define CSR_SPLIT_TIMEOUT_LO 0x1c #define CSR_CYCLE_TIME 0x200 #define CSR_BUS_TIME 0x204 #define CSR_BUSY_TIMEOUT 0x210 #define CSR_BUS_MANAGER_ID 0x21c #define CSR_BANDWIDTH_AVAILABLE 0x220 #define CSR_CHANNELS_AVAILABLE 0x224 #define CSR_CHANNELS_AVAILABLE_HI 0x224 #define CSR_CHANNELS_AVAILABLE_LO 0x228 #define CSR_BROADCAST_CHANNEL 0x234 #define CSR_CONFIG_ROM 0x400 #define CSR_CONFIG_ROM_END 0x800 #define CSR_FCP_COMMAND 0xB00 #define CSR_FCP_RESPONSE 0xD00 #define CSR_FCP_END 0xF00 #define CSR_TOPOLOGY_MAP 0x1000 #define CSR_TOPOLOGY_MAP_END 0x1400 #define CSR_SPEED_MAP 0x2000 #define CSR_SPEED_MAP_END 0x3000 #define fw_notify(s, args...) printk(KERN_NOTICE KBUILD_MODNAME ": " s, ## args) #define fw_error(s, args...) printk(KERN_ERR KBUILD_MODNAME ": " s, ## args) static inline void fw_memcpy_from_be32(void *_dst, void *_src, size_t size) { u32 *dst = _dst; u32 *src = _src; int i; for (i = 0; i < size / 4; i++) dst[i] = cpu_to_be32(src[i]); } static inline void fw_memcpy_to_be32(void *_dst, void *_src, size_t size) { fw_memcpy_from_be32(_dst, _src, size); } struct fw_card; struct fw_packet; struct fw_node; struct fw_request; struct fw_descriptor { struct list_head link; size_t length; u32 immediate; u32 key; const u32 *data; }; int fw_core_add_descriptor(struct fw_descriptor *desc); void fw_core_remove_descriptor(struct fw_descriptor *desc); typedef void (*fw_packet_callback_t)(struct fw_packet *packet, struct fw_card *card, int status); typedef void (*fw_transaction_callback_t)(struct fw_card *card, int rcode, void *data, size_t length, void *callback_data); /* * Important note: The callback must guarantee that either fw_send_response() * or kfree() is called on the @request. */ typedef void (*fw_address_callback_t)(struct fw_card *card, struct fw_request *request, int tcode, int destination, int source, int generation, int speed, unsigned long long offset, void *data, size_t length, void *callback_data); typedef void (*fw_bus_reset_callback_t)(struct fw_card *handle, int node_id, int generation, u32 *self_ids, int self_id_count, void *callback_data); struct fw_packet { int speed; int generation; u32 header[4]; size_t header_length; void *payload; size_t payload_length; u32 timestamp; /* * This callback is called when the packet transmission has * completed; for successful transmission, the status code is * the ack received from the destination, otherwise it's a * negative errno: ENOMEM, ESTALE, ETIMEDOUT, ENODEV, EIO. * The callback can be called from tasklet context and thus * must never block. */ fw_packet_callback_t callback; int ack; struct list_head link; void *driver_data; }; struct fw_transaction { int node_id; /* The generation is implied; it is always the current. */ int tlabel; int timestamp; struct list_head link; struct fw_packet packet; /* * The data passed to the callback is valid only during the * callback. */ fw_transaction_callback_t callback; void *callback_data; }; static inline struct fw_packet * fw_packet(struct list_head *l) { return list_entry(l, struct fw_packet, link); } struct fw_address_handler { u64 offset; size_t length; fw_address_callback_t address_callback; void *callback_data; struct list_head link; }; struct fw_address_region { u64 start; u64 end; }; extern const struct fw_address_region fw_low_memory_region; extern const struct fw_address_region fw_high_memory_region; extern const struct fw_address_region fw_private_region; extern const struct fw_address_region fw_csr_region; extern const struct fw_address_region fw_unit_space_region; int fw_core_add_address_handler(struct fw_address_handler *handler, const struct fw_address_region *region); void fw_core_remove_address_handler(struct fw_address_handler *handler); void fw_fill_response(struct fw_packet *response, u32 *request_header, int rcode, void *payload, size_t length); void fw_send_response(struct fw_card *card, struct fw_request *request, int rcode); extern struct bus_type fw_bus_type; struct fw_card { const struct fw_card_driver *driver; struct device *device; struct kref kref; int node_id; int generation; /* This is the generation used for timestamping incoming requests. */ int request_generation; int current_tlabel, tlabel_mask; struct list_head transaction_list; struct timer_list flush_timer; unsigned long reset_jiffies; unsigned long long guid; unsigned max_receive; int link_speed; int config_rom_generation; /* * We need to store up to 4 self ID for a maximum of 63 * devices plus 3 words for the topology map header. */ int self_id_count; u32 topology_map[252 + 3]; spinlock_t lock; /* Take this lock when handling the lists in * this struct. */ struct fw_node *local_node; struct fw_node *root_node; struct fw_node *irm_node; int color; int gap_count; bool beta_repeaters_present; int index; struct list_head link; /* Work struct for BM duties. */ struct delayed_work work; int bm_retries; int bm_generation; }; struct fw_card *fw_card_get(struct fw_card *card); void fw_card_put(struct fw_card *card); /* * The iso packet format allows for an immediate header/payload part * stored in 'header' immediately after the packet info plus an * indirect payload part that is pointer to by the 'payload' field. * Applications can use one or the other or both to implement simple * low-bandwidth streaming (e.g. audio) or more advanced * scatter-gather streaming (e.g. assembling video frame automatically). */ struct fw_iso_packet { u16 payload_length; /* Length of indirect payload. */ u32 interrupt : 1; /* Generate interrupt on this packet */ u32 skip : 1; /* Set to not send packet at all. */ u32 tag : 2; u32 sy : 4; u32 header_length : 8; /* Length of immediate header. */ u32 header[0]; }; #define FW_ISO_CONTEXT_TRANSMIT 0 #define FW_ISO_CONTEXT_RECEIVE 1 #define FW_ISO_CONTEXT_MATCH_TAG0 1 #define FW_ISO_CONTEXT_MATCH_TAG1 2 #define FW_ISO_CONTEXT_MATCH_TAG2 4 #define FW_ISO_CONTEXT_MATCH_TAG3 8 #define FW_ISO_CONTEXT_MATCH_ALL_TAGS 15 struct fw_iso_context; typedef void (*fw_iso_callback_t)(struct fw_iso_context *context, u32 cycle, size_t header_length, void *header, void *data); /* * An iso buffer is just a set of pages mapped for DMA in the * specified direction. Since the pages are to be used for DMA, they * are not mapped into the kernel virtual address space. We store the * DMA address in the page private. The helper function * fw_iso_buffer_map() will map the pages into a given vma. */ struct fw_iso_buffer { enum dma_data_direction direction; struct page **pages; int page_count; }; struct fw_iso_context { struct fw_card *card; int type; int channel; int speed; size_t header_size; fw_iso_callback_t callback; void *callback_data; }; int fw_iso_buffer_init(struct fw_iso_buffer *buffer, struct fw_card *card, int page_count, enum dma_data_direction direction); int fw_iso_buffer_map(struct fw_iso_buffer *buffer, struct vm_area_struct *vma); void fw_iso_buffer_destroy(struct fw_iso_buffer *buffer, struct fw_card *card); struct fw_iso_context * fw_iso_context_create(struct fw_card *card, int type, int channel, int speed, size_t header_size, fw_iso_callback_t callback, void *callback_data); void fw_iso_context_destroy(struct fw_iso_context *ctx); int fw_iso_context_queue(struct fw_iso_context *ctx, struct fw_iso_packet *packet, struct fw_iso_buffer *buffer, unsigned long payload); int fw_iso_context_start(struct fw_iso_context *ctx, int cycle, int sync, int tags); int fw_iso_context_stop(struct fw_iso_context *ctx); struct fw_card_driver { const char *name; /* * Enable the given card with the given initial config rom. * This function is expected to activate the card, and either * enable the PHY or set the link_on bit and initiate a bus * reset. */ int (*enable)(struct fw_card *card, u32 *config_rom, size_t length); int (*update_phy_reg)(struct fw_card *card, int address, int clear_bits, int set_bits); /* * Update the config rom for an enabled card. This function * should change the config rom that is presented on the bus * an initiate a bus reset. */ int (*set_config_rom)(struct fw_card *card, u32 *config_rom, size_t length); void (*send_request)(struct fw_card *card, struct fw_packet *packet); void (*send_response)(struct fw_card *card, struct fw_packet *packet); /* Calling cancel is valid once a packet has been submitted. */ int (*cancel_packet)(struct fw_card *card, struct fw_packet *packet); /* * Allow the specified node ID to do direct DMA out and in of * host memory. The card will disable this for all node when * a bus reset happens, so driver need to reenable this after * bus reset. Returns 0 on success, -ENODEV if the card * doesn't support this, -ESTALE if the generation doesn't * match. */ int (*enable_phys_dma)(struct fw_card *card, int node_id, int generation); u64 (*get_bus_time)(struct fw_card *card); struct fw_iso_context * (*allocate_iso_context)(struct fw_card *card, int type, size_t header_size); void (*free_iso_context)(struct fw_iso_context *ctx); int (*start_iso)(struct fw_iso_context *ctx, s32 cycle, u32 sync, u32 tags); int (*queue_iso)(struct fw_iso_context *ctx, struct fw_iso_packet *packet, struct fw_iso_buffer *buffer, unsigned long payload); int (*stop_iso)(struct fw_iso_context *ctx); }; int fw_core_initiate_bus_reset(struct fw_card *card, int short_reset); void fw_send_request(struct fw_card *card, struct fw_transaction *t, int tcode, int node_id, int generation, int speed, unsigned long long offset, void *data, size_t length, fw_transaction_callback_t callback, void *callback_data); int fw_cancel_transaction(struct fw_card *card, struct fw_transaction *transaction); void fw_flush_transactions(struct fw_card *card); void fw_send_phy_config(struct fw_card *card, int node_id, int generation, int gap_count); /* * Called by the topology code to inform the device code of node * activity; found, lost, or updated nodes. */ void fw_node_event(struct fw_card *card, struct fw_node *node, int event); /* API used by card level drivers */ void fw_card_initialize(struct fw_card *card, const struct fw_card_driver *driver, struct device *device); int fw_card_add(struct fw_card *card, u32 max_receive, u32 link_speed, u64 guid); void fw_core_remove_card(struct fw_card *card); void fw_core_handle_bus_reset(struct fw_card *card, int node_id, int generation, int self_id_count, u32 *self_ids); void fw_core_handle_request(struct fw_card *card, struct fw_packet *request); void fw_core_handle_response(struct fw_card *card, struct fw_packet *packet); #endif /* __fw_transaction_h */