drivers/firewire/core.h

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