drivers/firewire/core.h

   1 #ifndef _FIREWIRE_CORE_H
   2 #define _FIREWIRE_CORE_H
   3
   4 #include <linux/compiler.h>
   5 #include <linux/device.h>
   6 #include <linux/dma-mapping.h>
   7 #include <linux/fs.h>
   8 #include <linux/list.h>
   9 #include <linux/idr.h>
  10 #include <linux/mm_types.h>
  11 #include <linux/rwsem.h>
  12 #include <linux/slab.h>
  13 #include <linux/types.h>
  14
  15 #include <linux/atomic.h>
  16
  17 struct device;
  18 struct fw_card;
  19 struct fw_device;
  20 struct fw_iso_buffer;
  21 struct fw_iso_context;
  22 struct fw_iso_packet;
  23 struct fw_node;
  24 struct fw_packet;
  25
  26
  27 /* -card */
  28
  29 extern __printf(2, 3)
  30 void fw_err(const struct fw_card *card, const char *fmt, ...);
  31 extern __printf(2, 3)
  32 void fw_notice(const struct fw_card *card, const char *fmt, ...);
  33
  34 /* bitfields within the PHY registers */
  35 #define PHY_LINK_ACTIVE         0x80
  36 #define PHY_CONTENDER           0x40
  37 #define PHY_BUS_RESET           0x40
  38 #define PHY_EXTENDED_REGISTERS  0xe0
  39 #define PHY_BUS_SHORT_RESET     0x40
  40 #define PHY_INT_STATUS_BITS     0x3c
  41 #define PHY_ENABLE_ACCEL        0x02
  42 #define PHY_ENABLE_MULTI        0x01
  43 #define PHY_PAGE_SELECT         0xe0
  44
  45 #define BANDWIDTH_AVAILABLE_INITIAL     4915
  46 #define BROADCAST_CHANNEL_INITIAL       (1 << 31 | 31)
  47 #define BROADCAST_CHANNEL_VALID         (1 << 30)
  48
  49 #define CSR_STATE_BIT_CMSTR     (1 << 8)
  50 #define CSR_STATE_BIT_ABDICATE  (1 << 10)
  51
  52 struct fw_card_driver {
  53         /*
  54          * Enable the given card with the given initial config rom.
  55          * This function is expected to activate the card, and either
  56          * enable the PHY or set the link_on bit and initiate a bus
  57          * reset.
  58          */
  59         int (*enable)(struct fw_card *card,
  60                       const __be32 *config_rom, size_t length);
  61
  62         int (*read_phy_reg)(struct fw_card *card, int address);
  63         int (*update_phy_reg)(struct fw_card *card, int address,
  64                               int clear_bits, int set_bits);
  65
  66         /*
  67          * Update the config rom for an enabled card.  This function
  68          * should change the config rom that is presented on the bus
  69          * and initiate a bus reset.
  70          */
  71         int (*set_config_rom)(struct fw_card *card,
  72                               const __be32 *config_rom, size_t length);
  73
  74         void (*send_request)(struct fw_card *card, struct fw_packet *packet);
  75         void (*send_response)(struct fw_card *card, struct fw_packet *packet);
  76         /* Calling cancel is valid once a packet has been submitted. */
  77         int (*cancel_packet)(struct fw_card *card, struct fw_packet *packet);
  78
  79         /*
  80          * Allow the specified node ID to do direct DMA out and in of
  81          * host memory.  The card will disable this for all node when
  82          * a bus reset happens, so driver need to reenable this after
  83          * bus reset.  Returns 0 on success, -ENODEV if the card
  84          * doesn't support this, -ESTALE if the generation doesn't
  85          * match.
  86          */
  87         int (*enable_phys_dma)(struct fw_card *card,
  88                                int node_id, int generation);
  89
  90         u32 (*read_csr)(struct fw_card *card, int csr_offset);
  91         void (*write_csr)(struct fw_card *card, int csr_offset, u32 value);
  92
  93         struct fw_iso_context *
  94         (*allocate_iso_context)(struct fw_card *card,
  95                                 int type, int channel, size_t header_size);
  96         void (*free_iso_context)(struct fw_iso_context *ctx);
  97
  98         int (*start_iso)(struct fw_iso_context *ctx,
  99                          s32 cycle, u32 sync, u32 tags);
 100
 101         int (*set_iso_channels)(struct fw_iso_context *ctx, u64 *channels);
 102
 103         int (*queue_iso)(struct fw_iso_context *ctx,
 104                          struct fw_iso_packet *packet,
 105                          struct fw_iso_buffer *buffer,
 106                          unsigned long payload);
 107
 108         void (*flush_queue_iso)(struct fw_iso_context *ctx);
 109
 110         int (*flush_iso_completions)(struct fw_iso_context *ctx);
 111
 112         int (*stop_iso)(struct fw_iso_context *ctx);
 113 };
 114
 115 void fw_card_initialize(struct fw_card *card,
 116                 const struct fw_card_driver *driver, struct device *device);
 117 int fw_card_add(struct fw_card *card,
 118                 u32 max_receive, u32 link_speed, u64 guid);
 119 void fw_core_remove_card(struct fw_card *card);
 120 int fw_compute_block_crc(__be32 *block);
 121 void fw_schedule_bm_work(struct fw_card *card, unsigned long delay);
 122
 123 /* -cdev */
 124
 125 extern const struct file_operations fw_device_ops;
 126
 127 void fw_device_cdev_update(struct fw_device *device);
 128 void fw_device_cdev_remove(struct fw_device *device);
 129 void fw_cdev_handle_phy_packet(struct fw_card *card, struct fw_packet *p);
 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 static inline struct fw_device *fw_device_get(struct fw_device *device)
 139 {
 140         get_device(&device->device);
 141
 142         return device;
 143 }
 144
 145 static inline void fw_device_put(struct fw_device *device)
 146 {
 147         put_device(&device->device);
 148 }
 149
 150 struct fw_device *fw_device_get_by_devt(dev_t devt);
 151 int fw_device_set_broadcast_channel(struct device *dev, void *gen);
 152 void fw_node_event(struct fw_card *card, struct fw_node *node, int event);
 153
 154
 155 /* -iso */
 156
 157 int fw_iso_buffer_alloc(struct fw_iso_buffer *buffer, int page_count);
 158 int fw_iso_buffer_map_dma(struct fw_iso_buffer *buffer, struct fw_card *card,
 159                           enum dma_data_direction direction);
 160 int fw_iso_buffer_map_vma(struct fw_iso_buffer *buffer,
 161                           struct vm_area_struct *vma);
 162
 163
 164 /* -topology */
 165
 166 enum {
 167         FW_NODE_CREATED,
 168         FW_NODE_UPDATED,
 169         FW_NODE_DESTROYED,
 170         FW_NODE_LINK_ON,
 171         FW_NODE_LINK_OFF,
 172         FW_NODE_INITIATED_RESET,
 173 };
 174
 175 struct fw_node {
 176         u16 node_id;
 177         u8 color;
 178         u8 port_count;
 179         u8 link_on:1;
 180         u8 initiated_reset:1;
 181         u8 b_path:1;
 182         u8 phy_speed:2; /* As in the self ID packet. */
 183         u8 max_speed:2; /* Minimum of all phy-speeds on the path from the
 184                          * local node to this node. */
 185         u8 max_depth:4; /* Maximum depth to any leaf node */
 186         u8 max_hops:4;  /* Max hops in this sub tree */
 187         atomic_t ref_count;
 188
 189         /* For serializing node topology into a list. */
 190         struct list_head link;
 191
 192         /* Upper layer specific data. */
 193         void *data;
 194
 195         struct fw_node *ports[0];
 196 };
 197
 198 static inline struct fw_node *fw_node_get(struct fw_node *node)
 199 {
 200         atomic_inc(&node->ref_count);
 201
 202         return node;
 203 }
 204
 205 static inline void fw_node_put(struct fw_node *node)
 206 {
 207         if (atomic_dec_and_test(&node->ref_count))
 208                 kfree(node);
 209 }
 210
 211 void fw_core_handle_bus_reset(struct fw_card *card, int node_id,
 212         int generation, int self_id_count, u32 *self_ids, bool bm_abdicate);
 213 void fw_destroy_nodes(struct fw_card *card);
 214
 215 /*
 216  * Check whether new_generation is the immediate successor of old_generation.
 217  * Take counter roll-over at 255 (as per OHCI) into account.
 218  */
 219 static inline bool is_next_generation(int new_generation, int old_generation)
 220 {
 221         return (new_generation & 0xff) == ((old_generation + 1) & 0xff);
 222 }
 223
 224
 225 /* -transaction */
 226
 227 #define TCODE_LINK_INTERNAL             0xe
 228
 229 #define TCODE_IS_READ_REQUEST(tcode)    (((tcode) & ~1) == 4)
 230 #define TCODE_IS_BLOCK_PACKET(tcode)    (((tcode) &  1) != 0)
 231 #define TCODE_IS_LINK_INTERNAL(tcode)   ((tcode) == TCODE_LINK_INTERNAL)
 232 #define TCODE_IS_REQUEST(tcode)         (((tcode) &  2) == 0)
 233 #define TCODE_IS_RESPONSE(tcode)        (((tcode) &  2) != 0)
 234 #define TCODE_HAS_REQUEST_DATA(tcode)   (((tcode) & 12) != 4)
 235 #define TCODE_HAS_RESPONSE_DATA(tcode)  (((tcode) & 12) != 0)
 236
 237 #define LOCAL_BUS 0xffc0
 238
 239 /* OHCI-1394's default upper bound for physical DMA: 4 GB */
 240 #define FW_MAX_PHYSICAL_RANGE           (1ULL << 32)
 241
 242 void fw_core_handle_request(struct fw_card *card, struct fw_packet *request);
 243 void fw_core_handle_response(struct fw_card *card, struct fw_packet *packet);
 244 int fw_get_response_length(struct fw_request *request);
 245 void fw_fill_response(struct fw_packet *response, u32 *request_header,
 246                       int rcode, void *payload, size_t length);
 247
 248 #define FW_PHY_CONFIG_NO_NODE_ID        -1
 249 #define FW_PHY_CONFIG_CURRENT_GAP_COUNT -1
 250 void fw_send_phy_config(struct fw_card *card,
 251                         int node_id, int generation, int gap_count);
 252
 253 static inline bool is_ping_packet(u32 *data)
 254 {
 255         return (data[0] & 0xc0ffffff) == 0 && ~data[0] == data[1];
 256 }
 257
 258 #endif /* _FIREWIRE_CORE_H */