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_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
 151
 152 /* -topology */
 153
 154 enum {
 155         FW_NODE_CREATED,
 156         FW_NODE_UPDATED,
 157         FW_NODE_DESTROYED,
 158         FW_NODE_LINK_ON,
 159         FW_NODE_LINK_OFF,
 160         FW_NODE_INITIATED_RESET,
 161 };
 162
 163 struct fw_node {
 164         u16 node_id;
 165         u8 color;
 166         u8 port_count;
 167         u8 link_on:1;
 168         u8 initiated_reset:1;
 169         u8 b_path:1;
 170         u8 phy_speed:2; /* As in the self ID packet. */
 171         u8 max_speed:2; /* Minimum of all phy-speeds on the path from the
 172                          * local node to this node. */
 173         u8 max_depth:4; /* Maximum depth to any leaf node */
 174         u8 max_hops:4;  /* Max hops in this sub tree */
 175         atomic_t ref_count;
 176
 177         /* For serializing node topology into a list. */
 178         struct list_head link;
 179
 180         /* Upper layer specific data. */
 181         void *data;
 182
 183         struct fw_node *ports[0];
 184 };
 185
 186 static inline struct fw_node *fw_node_get(struct fw_node *node)
 187 {
 188         atomic_inc(&node->ref_count);
 189
 190         return node;
 191 }
 192
 193 static inline void fw_node_put(struct fw_node *node)
 194 {
 195         if (atomic_dec_and_test(&node->ref_count))
 196                 kfree(node);
 197 }
 198
 199 void fw_core_handle_bus_reset(struct fw_card *card, int node_id,
 200         int generation, int self_id_count, u32 *self_ids, bool bm_abdicate);
 201 void fw_destroy_nodes(struct fw_card *card);
 202
 203 /*
 204  * Check whether new_generation is the immediate successor of old_generation.
 205  * Take counter roll-over at 255 (as per OHCI) into account.
 206  */
 207 static inline bool is_next_generation(int new_generation, int old_generation)
 208 {
 209         return (new_generation & 0xff) == ((old_generation + 1) & 0xff);
 210 }
 211
 212
 213 /* -transaction */
 214
 215 #define TCODE_LINK_INTERNAL             0xe
 216
 217 #define TCODE_IS_READ_REQUEST(tcode)    (((tcode) & ~1) == 4)
 218 #define TCODE_IS_BLOCK_PACKET(tcode)    (((tcode) &  1) != 0)
 219 #define TCODE_IS_LINK_INTERNAL(tcode)   ((tcode) == TCODE_LINK_INTERNAL)
 220 #define TCODE_IS_REQUEST(tcode)         (((tcode) &  2) == 0)
 221 #define TCODE_IS_RESPONSE(tcode)        (((tcode) &  2) != 0)
 222 #define TCODE_HAS_REQUEST_DATA(tcode)   (((tcode) & 12) != 4)
 223 #define TCODE_HAS_RESPONSE_DATA(tcode)  (((tcode) & 12) != 0)
 224
 225 #define LOCAL_BUS 0xffc0
 226
 227 void fw_core_handle_request(struct fw_card *card, struct fw_packet *request);
 228 void fw_core_handle_response(struct fw_card *card, struct fw_packet *packet);
 229 int fw_get_response_length(struct fw_request *request);
 230 void fw_fill_response(struct fw_packet *response, u32 *request_header,
 231                       int rcode, void *payload, size_t length);
 232
 233 #define FW_PHY_CONFIG_NO_NODE_ID        -1
 234 #define FW_PHY_CONFIG_CURRENT_GAP_COUNT -1
 235 void fw_send_phy_config(struct fw_card *card,
 236                         int node_id, int generation, int gap_count);
 237
 238 static inline bool is_ping_packet(u32 *data)
 239 {
 240         return (data[0] & 0xc0ffffff) == 0 && ~data[0] == data[1];
 241 }
 242
 243 #endif /* _FIREWIRE_CORE_H */