1 #ifndef _FIREWIRE_CORE_H 2 #define _FIREWIRE_CORE_H 3 4 #include <linux/fs.h> 5 #include <linux/list.h> 6 #include <linux/idr.h> 7 #include <linux/mm_types.h> 8 #include <linux/rwsem.h> 9 #include <linux/slab.h> 10 #include <linux/types.h> 11 12 #include <asm/atomic.h> 13 14 struct device; 15 struct fw_card; 16 struct fw_device; 17 struct fw_iso_buffer; 18 struct fw_iso_context; 19 struct fw_iso_packet; 20 struct fw_node; 21 struct fw_packet; 22 23 24 /* -card */ 25 26 /* bitfields within the PHY registers */ 27 #define PHY_LINK_ACTIVE 0x80 28 #define PHY_CONTENDER 0x40 29 #define PHY_BUS_RESET 0x40 30 #define PHY_EXTENDED_REGISTERS 0xe0 31 #define PHY_BUS_SHORT_RESET 0x40 32 #define PHY_INT_STATUS_BITS 0x3c 33 #define PHY_ENABLE_ACCEL 0x02 34 #define PHY_ENABLE_MULTI 0x01 35 #define PHY_PAGE_SELECT 0xe0 36 37 #define BANDWIDTH_AVAILABLE_INITIAL 4915 38 #define BROADCAST_CHANNEL_INITIAL (1 << 31 | 31) 39 #define BROADCAST_CHANNEL_VALID (1 << 30) 40 41 #define CSR_STATE_BIT_CMSTR (1 << 8) 42 #define CSR_STATE_BIT_ABDICATE (1 << 10) 43 44 struct fw_card_driver { 45 /* 46 * Enable the given card with the given initial config rom. 47 * This function is expected to activate the card, and either 48 * enable the PHY or set the link_on bit and initiate a bus 49 * reset. 50 */ 51 int (*enable)(struct fw_card *card, 52 const __be32 *config_rom, size_t length); 53 54 int (*read_phy_reg)(struct fw_card *card, int address); 55 int (*update_phy_reg)(struct fw_card *card, int address, 56 int clear_bits, int set_bits); 57 58 /* 59 * Update the config rom for an enabled card. This function 60 * should change the config rom that is presented on the bus 61 * and initiate a bus reset. 62 */ 63 int (*set_config_rom)(struct fw_card *card, 64 const __be32 *config_rom, size_t length); 65 66 void (*send_request)(struct fw_card *card, struct fw_packet *packet); 67 void (*send_response)(struct fw_card *card, struct fw_packet *packet); 68 /* Calling cancel is valid once a packet has been submitted. */ 69 int (*cancel_packet)(struct fw_card *card, struct fw_packet *packet); 70 71 /* 72 * Allow the specified node ID to do direct DMA out and in of 73 * host memory. The card will disable this for all node when 74 * a bus reset happens, so driver need to reenable this after 75 * bus reset. Returns 0 on success, -ENODEV if the card 76 * doesn't support this, -ESTALE if the generation doesn't 77 * match. 78 */ 79 int (*enable_phys_dma)(struct fw_card *card, 80 int node_id, int generation); 81 82 u32 (*read_csr)(struct fw_card *card, int csr_offset); 83 void (*write_csr)(struct fw_card *card, int csr_offset, u32 value); 84 85 struct fw_iso_context * 86 (*allocate_iso_context)(struct fw_card *card, 87 int type, int channel, size_t header_size); 88 void (*free_iso_context)(struct fw_iso_context *ctx); 89 90 int (*start_iso)(struct fw_iso_context *ctx, 91 s32 cycle, u32 sync, u32 tags); 92 93 int (*set_iso_channels)(struct fw_iso_context *ctx, u64 *channels); 94 95 int (*queue_iso)(struct fw_iso_context *ctx, 96 struct fw_iso_packet *packet, 97 struct fw_iso_buffer *buffer, 98 unsigned long payload); 99 100 int (*stop_iso)(struct fw_iso_context *ctx); 101 }; 102 103 void fw_card_initialize(struct fw_card *card, 104 const struct fw_card_driver *driver, struct device *device); 105 int fw_card_add(struct fw_card *card, 106 u32 max_receive, u32 link_speed, u64 guid); 107 void fw_core_remove_card(struct fw_card *card); 108 int fw_compute_block_crc(__be32 *block); 109 void fw_schedule_bus_reset(struct fw_card *card, bool delayed, bool short_reset); 110 void fw_schedule_bm_work(struct fw_card *card, unsigned long delay); 111 112 static inline struct fw_card *fw_card_get(struct fw_card *card) 113 { 114 kref_get(&card->kref); 115 116 return card; 117 } 118 119 void fw_card_release(struct kref *kref); 120 121 static inline void fw_card_put(struct fw_card *card) 122 { 123 kref_put(&card->kref, fw_card_release); 124 } 125 126 127 /* -cdev */ 128 129 extern const struct file_operations fw_device_ops; 130 131 void fw_device_cdev_update(struct fw_device *device); 132 void fw_device_cdev_remove(struct fw_device *device); 133 void fw_cdev_handle_phy_packet(struct fw_card *card, struct fw_packet *p); 134 135 136 /* -device */ 137 138 extern struct rw_semaphore fw_device_rwsem; 139 extern struct idr fw_device_idr; 140 extern int fw_cdev_major; 141 142 struct fw_device *fw_device_get_by_devt(dev_t devt); 143 int fw_device_set_broadcast_channel(struct device *dev, void *gen); 144 void fw_node_event(struct fw_card *card, struct fw_node *node, int event); 145 146 147 /* -iso */ 148 149 int fw_iso_buffer_map(struct fw_iso_buffer *buffer, struct vm_area_struct *vma); 150 void fw_iso_resource_manage(struct fw_card *card, int generation, 151 u64 channels_mask, int *channel, int *bandwidth, 152 bool allocate, __be32 buffer[2]); 153 154 155 /* -topology */ 156 157 enum { 158 FW_NODE_CREATED, 159 FW_NODE_UPDATED, 160 FW_NODE_DESTROYED, 161 FW_NODE_LINK_ON, 162 FW_NODE_LINK_OFF, 163 FW_NODE_INITIATED_RESET, 164 }; 165 166 struct fw_node { 167 u16 node_id; 168 u8 color; 169 u8 port_count; 170 u8 link_on:1; 171 u8 initiated_reset:1; 172 u8 b_path:1; 173 u8 phy_speed:2; /* As in the self ID packet. */ 174 u8 max_speed:2; /* Minimum of all phy-speeds on the path from the 175 * local node to this node. */ 176 u8 max_depth:4; /* Maximum depth to any leaf node */ 177 u8 max_hops:4; /* Max hops in this sub tree */ 178 atomic_t ref_count; 179 180 /* For serializing node topology into a list. */ 181 struct list_head link; 182 183 /* Upper layer specific data. */ 184 void *data; 185 186 struct fw_node *ports[0]; 187 }; 188 189 static inline struct fw_node *fw_node_get(struct fw_node *node) 190 { 191 atomic_inc(&node->ref_count); 192 193 return node; 194 } 195 196 static inline void fw_node_put(struct fw_node *node) 197 { 198 if (atomic_dec_and_test(&node->ref_count)) 199 kfree(node); 200 } 201 202 void fw_core_handle_bus_reset(struct fw_card *card, int node_id, 203 int generation, int self_id_count, u32 *self_ids, bool bm_abdicate); 204 void fw_destroy_nodes(struct fw_card *card); 205 206 /* 207 * Check whether new_generation is the immediate successor of old_generation. 208 * Take counter roll-over at 255 (as per OHCI) into account. 209 */ 210 static inline bool is_next_generation(int new_generation, int old_generation) 211 { 212 return (new_generation & 0xff) == ((old_generation + 1) & 0xff); 213 } 214 215 216 /* -transaction */ 217 218 #define TCODE_IS_READ_REQUEST(tcode) (((tcode) & ~1) == 4) 219 #define TCODE_IS_BLOCK_PACKET(tcode) (((tcode) & 1) != 0) 220 #define TCODE_IS_LINK_INTERNAL(tcode) ((tcode) == 0xe) 221 #define TCODE_IS_REQUEST(tcode) (((tcode) & 2) == 0) 222 #define TCODE_IS_RESPONSE(tcode) (((tcode) & 2) != 0) 223 #define TCODE_HAS_REQUEST_DATA(tcode) (((tcode) & 12) != 4) 224 #define TCODE_HAS_RESPONSE_DATA(tcode) (((tcode) & 12) != 0) 225 226 #define LOCAL_BUS 0xffc0 227 228 void fw_core_handle_request(struct fw_card *card, struct fw_packet *request); 229 void fw_core_handle_response(struct fw_card *card, struct fw_packet *packet); 230 int fw_get_response_length(struct fw_request *request); 231 void fw_fill_response(struct fw_packet *response, u32 *request_header, 232 int rcode, void *payload, size_t length); 233 234 #define FW_PHY_CONFIG_NO_NODE_ID -1 235 #define FW_PHY_CONFIG_CURRENT_GAP_COUNT -1 236 void fw_send_phy_config(struct fw_card *card, 237 int node_id, int generation, int gap_count); 238 239 static inline bool is_ping_packet(u32 *data) 240 { 241 return (data[0] & 0xc0ffffff) == 0 && ~data[0] == data[1]; 242 } 243 244 #endif /* _FIREWIRE_CORE_H */ 245