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 (*update_phy_reg)(struct fw_card *card, int address,
  55                               int clear_bits, int set_bits);
  56
  57         /*
  58          * Update the config rom for an enabled card.  This function
  59          * should change the config rom that is presented on the bus
  60          * and initiate a bus reset.
  61          */
  62         int (*set_config_rom)(struct fw_card *card,
  63                               const __be32 *config_rom, size_t length);
  64
  65         void (*send_request)(struct fw_card *card, struct fw_packet *packet);
  66         void (*send_response)(struct fw_card *card, struct fw_packet *packet);
  67         /* Calling cancel is valid once a packet has been submitted. */
  68         int (*cancel_packet)(struct fw_card *card, struct fw_packet *packet);
  69
  70         /*
  71          * Allow the specified node ID to do direct DMA out and in of
  72          * host memory.  The card will disable this for all node when
  73          * a bus reset happens, so driver need to reenable this after
  74          * bus reset.  Returns 0 on success, -ENODEV if the card
  75          * doesn't support this, -ESTALE if the generation doesn't
  76          * match.
  77          */
  78         int (*enable_phys_dma)(struct fw_card *card,
  79                                int node_id, int generation);
  80
  81         u32 (*read_csr_reg)(struct fw_card *card, int csr_offset);
  82         void (*write_csr_reg)(struct fw_card *card, int csr_offset, u32 value);
  83
  84         struct fw_iso_context *
  85         (*allocate_iso_context)(struct fw_card *card,
  86                                 int type, int channel, size_t header_size);
  87         void (*free_iso_context)(struct fw_iso_context *ctx);
  88
  89         int (*start_iso)(struct fw_iso_context *ctx,
  90                          s32 cycle, u32 sync, u32 tags);
  91
  92         int (*queue_iso)(struct fw_iso_context *ctx,
  93                          struct fw_iso_packet *packet,
  94                          struct fw_iso_buffer *buffer,
  95                          unsigned long payload);
  96
  97         int (*stop_iso)(struct fw_iso_context *ctx);
  98 };
  99
 100 void fw_card_initialize(struct fw_card *card,
 101                 const struct fw_card_driver *driver, struct device *device);
 102 int fw_card_add(struct fw_card *card,
 103                 u32 max_receive, u32 link_speed, u64 guid);
 104 void fw_core_remove_card(struct fw_card *card);
 105 int fw_core_initiate_bus_reset(struct fw_card *card, int short_reset);
 106 int fw_compute_block_crc(__be32 *block);
 107 void fw_schedule_bm_work(struct fw_card *card, unsigned long delay);
 108
 109 static inline struct fw_card *fw_card_get(struct fw_card *card)
 110 {
 111         kref_get(&card->kref);
 112
 113         return card;
 114 }
 115
 116 void fw_card_release(struct kref *kref);
 117
 118 static inline void fw_card_put(struct fw_card *card)
 119 {
 120         kref_put(&card->kref, fw_card_release);
 121 }
 122
 123
 124 /* -cdev */
 125
 126 extern const struct file_operations fw_device_ops;
 127
 128 void fw_device_cdev_update(struct fw_device *device);
 129 void fw_device_cdev_remove(struct fw_device *device);
 130
 131
 132 /* -device */
 133
 134 extern struct rw_semaphore fw_device_rwsem;
 135 extern struct idr fw_device_idr;
 136 extern int fw_cdev_major;
 137
 138 struct fw_device *fw_device_get_by_devt(dev_t devt);
 139 int fw_device_set_broadcast_channel(struct device *dev, void *gen);
 140 void fw_node_event(struct fw_card *card, struct fw_node *node, int event);
 141
 142
 143 /* -iso */
 144
 145 int fw_iso_buffer_map(struct fw_iso_buffer *buffer, struct vm_area_struct *vma);
 146 void fw_iso_resource_manage(struct fw_card *card, int generation,
 147                             u64 channels_mask, int *channel, int *bandwidth,
 148                             bool allocate, __be32 buffer[2]);
 149
 150
 151 /* -topology */
 152
 153 enum {
 154         FW_NODE_CREATED,
 155         FW_NODE_UPDATED,
 156         FW_NODE_DESTROYED,
 157         FW_NODE_LINK_ON,
 158         FW_NODE_LINK_OFF,
 159         FW_NODE_INITIATED_RESET,
 160 };
 161
 162 struct fw_node {
 163         u16 node_id;
 164         u8 color;
 165         u8 port_count;
 166         u8 link_on:1;
 167         u8 initiated_reset:1;
 168         u8 b_path:1;
 169         u8 phy_speed:2; /* As in the self ID packet. */
 170         u8 max_speed:2; /* Minimum of all phy-speeds on the path from the
 171                          * local node to this node. */
 172         u8 max_depth:4; /* Maximum depth to any leaf node */
 173         u8 max_hops:4;  /* Max hops in this sub tree */
 174         atomic_t ref_count;
 175
 176         /* For serializing node topology into a list. */
 177         struct list_head link;
 178
 179         /* Upper layer specific data. */
 180         void *data;
 181
 182         struct fw_node *ports[0];
 183 };
 184
 185 static inline struct fw_node *fw_node_get(struct fw_node *node)
 186 {
 187         atomic_inc(&node->ref_count);
 188
 189         return node;
 190 }
 191
 192 static inline void fw_node_put(struct fw_node *node)
 193 {
 194         if (atomic_dec_and_test(&node->ref_count))
 195                 kfree(node);
 196 }
 197
 198 void fw_core_handle_bus_reset(struct fw_card *card, int node_id,
 199         int generation, int self_id_count, u32 *self_ids, bool bm_abdicate);
 200 void fw_destroy_nodes(struct fw_card *card);
 201
 202 /*
 203  * Check whether new_generation is the immediate successor of old_generation.
 204  * Take counter roll-over at 255 (as per OHCI) into account.
 205  */
 206 static inline bool is_next_generation(int new_generation, int old_generation)
 207 {
 208         return (new_generation & 0xff) == ((old_generation + 1) & 0xff);
 209 }
 210
 211
 212 /* -transaction */
 213
 214 #define TCODE_IS_READ_REQUEST(tcode)    (((tcode) & ~1) == 4)
 215 #define TCODE_IS_BLOCK_PACKET(tcode)    (((tcode) &  1) != 0)
 216 #define TCODE_IS_REQUEST(tcode)         (((tcode) &  2) == 0)
 217 #define TCODE_IS_RESPONSE(tcode)        (((tcode) &  2) != 0)
 218 #define TCODE_HAS_REQUEST_DATA(tcode)   (((tcode) & 12) != 4)
 219 #define TCODE_HAS_RESPONSE_DATA(tcode)  (((tcode) & 12) != 0)
 220
 221 #define LOCAL_BUS 0xffc0
 222
 223 void fw_core_handle_request(struct fw_card *card, struct fw_packet *request);
 224 void fw_core_handle_response(struct fw_card *card, struct fw_packet *packet);
 225 int fw_get_response_length(struct fw_request *request);
 226 void fw_fill_response(struct fw_packet *response, u32 *request_header,
 227                       int rcode, void *payload, size_t length);
 228 void fw_send_phy_config(struct fw_card *card,
 229                         int node_id, int generation, int gap_count);
 230
 231 #endif /* _FIREWIRE_CORE_H */