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473 lines
13 KiB
473 lines
13 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _LINUX_FIREWIRE_H |
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#define _LINUX_FIREWIRE_H |
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#include <linux/completion.h> |
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#include <linux/device.h> |
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#include <linux/dma-mapping.h> |
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#include <linux/kernel.h> |
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#include <linux/kref.h> |
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#include <linux/list.h> |
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#include <linux/mutex.h> |
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#include <linux/spinlock.h> |
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#include <linux/sysfs.h> |
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#include <linux/timer.h> |
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#include <linux/types.h> |
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#include <linux/workqueue.h> |
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#include <linux/atomic.h> |
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#include <asm/byteorder.h> |
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#define CSR_REGISTER_BASE 0xfffff0000000ULL |
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/* register offsets are 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_PRIORITY_BUDGET 0x218 |
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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_MAINT_UTILITY 0x230 |
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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_OMPR 0x900 |
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#define CSR_OPCR(i) (0x904 + (i) * 4) |
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#define CSR_IMPR 0x980 |
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#define CSR_IPCR(i) (0x984 + (i) * 4) |
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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 CSR_OFFSET 0x40 |
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#define CSR_LEAF 0x80 |
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#define CSR_DIRECTORY 0xc0 |
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#define CSR_DESCRIPTOR 0x01 |
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#define CSR_VENDOR 0x03 |
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#define CSR_HARDWARE_VERSION 0x04 |
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#define CSR_UNIT 0x11 |
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#define CSR_SPECIFIER_ID 0x12 |
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#define CSR_VERSION 0x13 |
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#define CSR_DEPENDENT_INFO 0x14 |
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#define CSR_MODEL 0x17 |
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#define CSR_DIRECTORY_ID 0x20 |
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struct fw_csr_iterator { |
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const u32 *p; |
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const u32 *end; |
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}; |
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void fw_csr_iterator_init(struct fw_csr_iterator *ci, const u32 *p); |
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int fw_csr_iterator_next(struct fw_csr_iterator *ci, int *key, int *value); |
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int fw_csr_string(const u32 *directory, int key, char *buf, size_t size); |
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extern struct bus_type fw_bus_type; |
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struct fw_card_driver; |
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struct fw_node; |
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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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struct kref kref; |
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struct completion done; |
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int node_id; |
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int generation; |
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int current_tlabel; |
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u64 tlabel_mask; |
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struct list_head transaction_list; |
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u64 reset_jiffies; |
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u32 split_timeout_hi; |
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u32 split_timeout_lo; |
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unsigned int split_timeout_cycles; |
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unsigned int split_timeout_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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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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u8 color; /* must be u8 to match the definition in struct fw_node */ |
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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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struct list_head phy_receiver_list; |
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struct delayed_work br_work; /* bus reset job */ |
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bool br_short; |
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struct delayed_work bm_work; /* bus manager job */ |
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int bm_retries; |
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int bm_generation; |
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int bm_node_id; |
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bool bm_abdicate; |
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bool priority_budget_implemented; /* controller feature */ |
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bool broadcast_channel_auto_allocated; /* controller feature */ |
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bool broadcast_channel_allocated; |
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u32 broadcast_channel; |
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__be32 topology_map[(CSR_TOPOLOGY_MAP_END - CSR_TOPOLOGY_MAP) / 4]; |
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__be32 maint_utility_register; |
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}; |
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static inline struct fw_card *fw_card_get(struct fw_card *card) |
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{ |
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kref_get(&card->kref); |
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return card; |
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} |
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void fw_card_release(struct kref *kref); |
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static inline void fw_card_put(struct fw_card *card) |
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{ |
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kref_put(&card->kref, fw_card_release); |
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} |
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struct fw_attribute_group { |
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struct attribute_group *groups[2]; |
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struct attribute_group group; |
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struct attribute *attrs[13]; |
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}; |
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enum fw_device_state { |
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FW_DEVICE_INITIALIZING, |
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FW_DEVICE_RUNNING, |
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FW_DEVICE_GONE, |
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FW_DEVICE_SHUTDOWN, |
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}; |
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/* |
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* Note, fw_device.generation always has to be read before fw_device.node_id. |
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* Use SMP memory barriers to ensure this. Otherwise requests will be sent |
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* to an outdated node_id if the generation was updated in the meantime due |
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* to a bus reset. |
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* |
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* Likewise, fw-core will take care to update .node_id before .generation so |
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* that whenever fw_device.generation is current WRT the actual bus generation, |
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* fw_device.node_id is guaranteed to be current too. |
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* |
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* The same applies to fw_device.card->node_id vs. fw_device.generation. |
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* |
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* fw_device.config_rom and fw_device.config_rom_length may be accessed during |
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* the lifetime of any fw_unit belonging to the fw_device, before device_del() |
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* was called on the last fw_unit. Alternatively, they may be accessed while |
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* holding fw_device_rwsem. |
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*/ |
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struct fw_device { |
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atomic_t state; |
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struct fw_node *node; |
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int node_id; |
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int generation; |
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unsigned max_speed; |
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struct fw_card *card; |
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struct device device; |
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struct mutex client_list_mutex; |
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struct list_head client_list; |
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const u32 *config_rom; |
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size_t config_rom_length; |
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int config_rom_retries; |
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unsigned is_local:1; |
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unsigned max_rec:4; |
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unsigned cmc:1; |
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unsigned irmc:1; |
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unsigned bc_implemented:2; |
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work_func_t workfn; |
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struct delayed_work work; |
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struct fw_attribute_group attribute_group; |
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}; |
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static inline struct fw_device *fw_device(struct device *dev) |
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{ |
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return container_of(dev, struct fw_device, device); |
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} |
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static inline int fw_device_is_shutdown(struct fw_device *device) |
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{ |
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return atomic_read(&device->state) == FW_DEVICE_SHUTDOWN; |
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} |
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int fw_device_enable_phys_dma(struct fw_device *device); |
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/* |
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* fw_unit.directory must not be accessed after device_del(&fw_unit.device). |
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*/ |
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struct fw_unit { |
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struct device device; |
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const u32 *directory; |
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struct fw_attribute_group attribute_group; |
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}; |
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static inline struct fw_unit *fw_unit(struct device *dev) |
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{ |
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return container_of(dev, struct fw_unit, device); |
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} |
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static inline struct fw_unit *fw_unit_get(struct fw_unit *unit) |
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{ |
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get_device(&unit->device); |
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return unit; |
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} |
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static inline void fw_unit_put(struct fw_unit *unit) |
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{ |
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put_device(&unit->device); |
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} |
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static inline struct fw_device *fw_parent_device(struct fw_unit *unit) |
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{ |
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return fw_device(unit->device.parent); |
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} |
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struct ieee1394_device_id; |
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struct fw_driver { |
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struct device_driver driver; |
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int (*probe)(struct fw_unit *unit, const struct ieee1394_device_id *id); |
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/* Called when the parent device sits through a bus reset. */ |
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void (*update)(struct fw_unit *unit); |
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void (*remove)(struct fw_unit *unit); |
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const struct ieee1394_device_id *id_table; |
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}; |
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struct fw_packet; |
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struct fw_request; |
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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, size_t length, |
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void *callback_data); |
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/* |
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* This callback handles an inbound request subaction. It is called in |
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* RCU read-side context, therefore must not sleep. |
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* |
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* The callback should not initiate outbound request subactions directly. |
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* Otherwise there is a danger of recursion of inbound and outbound |
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* transactions from and to the local node. |
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* |
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* The callback is responsible that either fw_send_response() or kfree() |
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* is called on the @request, except for FCP registers for which the core |
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* takes care of that. |
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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, |
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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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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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dma_addr_t payload_bus; |
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bool payload_mapped; |
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u32 timestamp; |
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/* |
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* This callback is called when the packet transmission has completed. |
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* For successful transmission, the status code is the ack received |
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* from the destination. Otherwise it is one of the juju-specific |
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* rcodes: RCODE_SEND_ERROR, _CANCELLED, _BUSY, _GENERATION, _NO_ACK. |
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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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struct list_head link; |
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struct fw_card *card; |
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bool is_split_transaction; |
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struct timer_list split_timeout_timer; |
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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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struct fw_address_handler { |
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u64 offset; |
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u64 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_send_response(struct fw_card *card, |
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struct fw_request *request, int rcode); |
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int fw_get_request_speed(struct fw_request *request); |
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void fw_send_request(struct fw_card *card, struct fw_transaction *t, |
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int tcode, 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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int fw_cancel_transaction(struct fw_card *card, |
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struct fw_transaction *transaction); |
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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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const char *fw_rcode_string(int rcode); |
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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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void fw_schedule_bus_reset(struct fw_card *card, bool delayed, |
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bool short_reset); |
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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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/* |
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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; /* tx: Set to not send packet at all */ |
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/* rx: Sync bit, wait for matching sy */ |
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u32 tag:2; /* tx: Tag in packet header */ |
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u32 sy:4; /* tx: Sy in packet header */ |
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u32 header_length:8; /* Length of immediate header */ |
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u32 header[0]; /* tx: Top of 1394 isoch. data_block */ |
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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_RECEIVE_MULTICHANNEL 2 |
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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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int page_count_mapped; |
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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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void fw_iso_buffer_destroy(struct fw_iso_buffer *buffer, struct fw_card *card); |
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size_t fw_iso_buffer_lookup(struct fw_iso_buffer *buffer, dma_addr_t completed); |
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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, size_t header_length, |
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void *header, void *data); |
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typedef void (*fw_iso_mc_callback_t)(struct fw_iso_context *context, |
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dma_addr_t completed, 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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bool drop_overflow_headers; |
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size_t header_size; |
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union { |
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fw_iso_callback_t sc; |
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fw_iso_mc_callback_t mc; |
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} callback; |
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void *callback_data; |
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}; |
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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_set_channels(struct fw_iso_context *ctx, u64 *channels); |
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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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void fw_iso_context_queue_flush(struct fw_iso_context *ctx); |
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int fw_iso_context_flush_completions(struct fw_iso_context *ctx); |
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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, |
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bool allocate); |
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extern struct workqueue_struct *fw_workqueue; |
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#endif /* _LINUX_FIREWIRE_H */
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