099d54143e
The IP-over-1394 driver will add child devices beneath card devices which are not of type fw_device. Hence firewire-core's callbacks in device_for_each_child() and device_find_child() need to check for the device type now. Initial version written by Jay Fenlason. Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
293 lines
8.5 KiB
C
293 lines
8.5 KiB
C
#ifndef _FIREWIRE_CORE_H
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#define _FIREWIRE_CORE_H
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#include <linux/dma-mapping.h>
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#include <linux/fs.h>
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#include <linux/list.h>
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#include <linux/idr.h>
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#include <linux/mm_types.h>
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#include <linux/rwsem.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <asm/atomic.h>
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struct device;
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struct fw_card;
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struct fw_device;
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struct fw_iso_buffer;
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struct fw_iso_context;
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struct fw_iso_packet;
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struct fw_node;
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struct fw_packet;
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/* -card */
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/* bitfields 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 BANDWIDTH_AVAILABLE_INITIAL 4915
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#define BROADCAST_CHANNEL_INITIAL (1 << 31 | 31)
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#define BROADCAST_CHANNEL_VALID (1 << 30)
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struct fw_card_driver {
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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, int channel, 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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void fw_card_initialize(struct fw_card *card,
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const struct fw_card_driver *driver, struct device *device);
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int fw_card_add(struct fw_card *card,
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u32 max_receive, u32 link_speed, u64 guid);
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void fw_core_remove_card(struct fw_card *card);
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int fw_core_initiate_bus_reset(struct fw_card *card, int short_reset);
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int fw_compute_block_crc(u32 *block);
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void fw_schedule_bm_work(struct fw_card *card, unsigned long delay);
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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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/* -cdev */
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extern const struct file_operations fw_device_ops;
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void fw_device_cdev_update(struct fw_device *device);
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void fw_device_cdev_remove(struct fw_device *device);
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/* -device */
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extern struct rw_semaphore fw_device_rwsem;
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extern struct idr fw_device_idr;
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extern int fw_cdev_major;
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struct fw_device *fw_device_get_by_devt(dev_t devt);
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int fw_device_set_broadcast_channel(struct device *dev, void *gen);
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void fw_node_event(struct fw_card *card, struct fw_node *node, int event);
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/* -iso */
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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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/*
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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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typedef void (*fw_iso_callback_t)(struct fw_iso_context *context,
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u32 cycle, size_t header_length,
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void *header, void *data);
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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 fw_iso_buffer_init(struct fw_iso_buffer *buffer, struct fw_card *card,
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int page_count, enum dma_data_direction direction);
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int fw_iso_buffer_map(struct fw_iso_buffer *buffer, struct vm_area_struct *vma);
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void fw_iso_buffer_destroy(struct fw_iso_buffer *buffer, struct fw_card *card);
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struct fw_iso_context *fw_iso_context_create(struct fw_card *card,
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int type, int channel, int speed, size_t header_size,
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fw_iso_callback_t callback, void *callback_data);
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int 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 fw_iso_context_start(struct fw_iso_context *ctx,
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int cycle, int sync, int tags);
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int fw_iso_context_stop(struct fw_iso_context *ctx);
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void fw_iso_context_destroy(struct fw_iso_context *ctx);
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void fw_iso_resource_manage(struct fw_card *card, int generation,
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u64 channels_mask, int *channel, int *bandwidth, bool allocate);
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/* -topology */
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enum {
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FW_NODE_CREATED,
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FW_NODE_UPDATED,
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FW_NODE_DESTROYED,
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FW_NODE_LINK_ON,
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FW_NODE_LINK_OFF,
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FW_NODE_INITIATED_RESET,
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};
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struct fw_node {
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u16 node_id;
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u8 color;
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u8 port_count;
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u8 link_on:1;
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u8 initiated_reset:1;
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u8 b_path:1;
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u8 phy_speed:2; /* As in the self ID packet. */
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u8 max_speed:2; /* Minimum of all phy-speeds on the path from the
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* local node to this node. */
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u8 max_depth:4; /* Maximum depth to any leaf node */
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u8 max_hops:4; /* Max hops in this sub tree */
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atomic_t ref_count;
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/* For serializing node topology into a list. */
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struct list_head link;
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/* Upper layer specific data. */
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void *data;
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struct fw_node *ports[0];
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};
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static inline struct fw_node *fw_node_get(struct fw_node *node)
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{
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atomic_inc(&node->ref_count);
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return node;
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}
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static inline void fw_node_put(struct fw_node *node)
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{
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if (atomic_dec_and_test(&node->ref_count))
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kfree(node);
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}
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void fw_core_handle_bus_reset(struct fw_card *card, int node_id,
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int generation, int self_id_count, u32 *self_ids);
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void fw_destroy_nodes(struct fw_card *card);
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/*
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* Check whether new_generation is the immediate successor of old_generation.
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* Take counter roll-over at 255 (as per OHCI) into account.
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*/
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static inline bool is_next_generation(int new_generation, int old_generation)
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{
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return (new_generation & 0xff) == ((old_generation + 1) & 0xff);
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}
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/* -transaction */
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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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void fw_core_handle_request(struct fw_card *card, struct fw_packet *request);
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void fw_core_handle_response(struct fw_card *card, struct fw_packet *packet);
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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_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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static inline int fw_stream_packet_destination_id(int tag, int channel, int sy)
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{
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return tag << 14 | channel << 8 | sy;
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}
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#endif /* _FIREWIRE_CORE_H */
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