drivers/firewire/core.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _FIREWIRE_CORE_H
   3 #define _FIREWIRE_CORE_H
   4
   5 #include <linux/compiler.h>
   6 #include <linux/device.h>
   7 #include <linux/dma-mapping.h>
   8 #include <linux/fs.h>
   9 #include <linux/list.h>
  10 #include <linux/idr.h>
  11 #include <linux/mm_types.h>
  12 #include <linux/rwsem.h>
  13 #include <linux/slab.h>
  14 #include <linux/types.h>
  15
  16 #include <linux/refcount.h>
  17
  18 struct device;
  19 struct fw_card;
  20 struct fw_device;
  21 struct fw_iso_buffer;
  22 struct fw_iso_context;
  23 struct fw_iso_packet;
  24 struct fw_node;
  25 struct fw_packet;
  26
  27
  28 /* -card */
  29
  30 extern __printf(2, 3)
  31 void fw_err(const struct fw_card *card, const char *fmt, ...);
  32 extern __printf(2, 3)
  33 void fw_notice(const struct fw_card *card, const char *fmt, ...);
  34
  35 /* bitfields within the PHY registers */
  36 #define PHY_LINK_ACTIVE         0x80
  37 #define PHY_CONTENDER           0x40
  38 #define PHY_BUS_RESET           0x40
  39 #define PHY_EXTENDED_REGISTERS  0xe0
  40 #define PHY_BUS_SHORT_RESET     0x40
  41 #define PHY_INT_STATUS_BITS     0x3c
  42 #define PHY_ENABLE_ACCEL        0x02
  43 #define PHY_ENABLE_MULTI        0x01
  44 #define PHY_PAGE_SELECT         0xe0
  45
  46 #define BANDWIDTH_AVAILABLE_INITIAL     4915
  47 #define BROADCAST_CHANNEL_INITIAL       (1 << 31 | 31)
  48 #define BROADCAST_CHANNEL_VALID         (1 << 30)
  49
  50 #define CSR_STATE_BIT_CMSTR     (1 << 8)
  51 #define CSR_STATE_BIT_ABDICATE  (1 << 10)
  52
  53 struct fw_card_driver {
  54         /*
  55          * Enable the given card with the given initial config rom.
  56          * This function is expected to activate the card, and either
  57          * enable the PHY or set the link_on bit and initiate a bus
  58          * reset.
  59          */
  60         int (*enable)(struct fw_card *card,
  61                       const __be32 *config_rom, size_t length);
  62
  63         int (*read_phy_reg)(struct fw_card *card, int address);
  64         int (*update_phy_reg)(struct fw_card *card, int address,
  65                               int clear_bits, int set_bits);
  66
  67         /*
  68          * Update the config rom for an enabled card.  This function
  69          * should change the config rom that is presented on the bus
  70          * and initiate a bus reset.
  71          */
  72         int (*set_config_rom)(struct fw_card *card,
  73                               const __be32 *config_rom, size_t length);
  74
  75         void (*send_request)(struct fw_card *card, struct fw_packet *packet);
  76         void (*send_response)(struct fw_card *card, struct fw_packet *packet);
  77         /* Calling cancel is valid once a packet has been submitted. */
  78         int (*cancel_packet)(struct fw_card *card, struct fw_packet *packet);
  79
  80         /*
  81          * Allow the specified node ID to do direct DMA out and in of
  82          * host memory.  The card will disable this for all node when
  83          * a bus reset happens, so driver need to reenable this after
  84          * bus reset.  Returns 0 on success, -ENODEV if the card
  85          * doesn't support this, -ESTALE if the generation doesn't
  86          * match.
  87          */
  88         int (*enable_phys_dma)(struct fw_card *card,
  89                                int node_id, int generation);
  90
  91         u32 (*read_csr)(struct fw_card *card, int csr_offset);
  92         void (*write_csr)(struct fw_card *card, int csr_offset, u32 value);
  93
  94         struct fw_iso_context *
  95         (*allocate_iso_context)(struct fw_card *card,
  96                                 int type, int channel, size_t header_size);
  97         void (*free_iso_context)(struct fw_iso_context *ctx);
  98
  99         int (*start_iso)(struct fw_iso_context *ctx,
 100                          s32 cycle, u32 sync, u32 tags);
 101
 102         int (*set_iso_channels)(struct fw_iso_context *ctx, u64 *channels);
 103
 104         int (*queue_iso)(struct fw_iso_context *ctx,
 105                          struct fw_iso_packet *packet,
 106                          struct fw_iso_buffer *buffer,
 107                          unsigned long payload);
 108
 109         void (*flush_queue_iso)(struct fw_iso_context *ctx);
 110
 111         int (*flush_iso_completions)(struct fw_iso_context *ctx);
 112
 113         int (*stop_iso)(struct fw_iso_context *ctx);
 114 };
 115
 116 void fw_card_initialize(struct fw_card *card,
 117                 const struct fw_card_driver *driver, struct device *device);
 118 int fw_card_add(struct fw_card *card,
 119                 u32 max_receive, u32 link_speed, u64 guid);
 120 void fw_core_remove_card(struct fw_card *card);
 121 int fw_compute_block_crc(__be32 *block);
 122 void fw_schedule_bm_work(struct fw_card *card, unsigned long delay);
 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 void fw_cdev_handle_phy_packet(struct fw_card *card, struct fw_packet *p);
 131
 132
 133 /* -device */
 134
 135 extern struct rw_semaphore fw_device_rwsem;
 136 extern struct idr fw_device_idr;
 137 extern int fw_cdev_major;
 138
 139 static inline struct fw_device *fw_device_get(struct fw_device *device)
 140 {
 141         get_device(&device->device);
 142
 143         return device;
 144 }
 145
 146 static inline void fw_device_put(struct fw_device *device)
 147 {
 148         put_device(&device->device);
 149 }
 150
 151 struct fw_device *fw_device_get_by_devt(dev_t devt);
 152 int fw_device_set_broadcast_channel(struct device *dev, void *gen);
 153 void fw_node_event(struct fw_card *card, struct fw_node *node, int event);
 154
 155
 156 /* -iso */
 157
 158 int fw_iso_buffer_alloc(struct fw_iso_buffer *buffer, int page_count);
 159 int fw_iso_buffer_map_dma(struct fw_iso_buffer *buffer, struct fw_card *card,
 160                           enum dma_data_direction direction);
 161 int fw_iso_buffer_map_vma(struct fw_iso_buffer *buffer,
 162                           struct vm_area_struct *vma);
 163
 164
 165 /* -topology */
 166
 167 enum {
 168         FW_NODE_CREATED,
 169         FW_NODE_UPDATED,
 170         FW_NODE_DESTROYED,
 171         FW_NODE_LINK_ON,
 172         FW_NODE_LINK_OFF,
 173         FW_NODE_INITIATED_RESET,
 174 };
 175
 176 struct fw_node {
 177         u16 node_id;
 178         u8 color;
 179         u8 port_count;
 180         u8 link_on:1;
 181         u8 initiated_reset:1;
 182         u8 b_path:1;
 183         u8 phy_speed:2; /* As in the self ID packet. */
 184         u8 max_speed:2; /* Minimum of all phy-speeds on the path from the
 185                          * local node to this node. */
 186         u8 max_depth:4; /* Maximum depth to any leaf node */
 187         u8 max_hops:4;  /* Max hops in this sub tree */
 188         refcount_t ref_count;
 189
 190         /* For serializing node topology into a list. */
 191         struct list_head link;
 192
 193         /* Upper layer specific data. */
 194         void *data;
 195
 196         struct fw_node *ports[0];
 197 };
 198
 199 static inline struct fw_node *fw_node_get(struct fw_node *node)
 200 {
 201         refcount_inc(&node->ref_count);
 202
 203         return node;
 204 }
 205
 206 static inline void fw_node_put(struct fw_node *node)
 207 {
 208         if (refcount_dec_and_test(&node->ref_count))
 209                 kfree(node);
 210 }
 211
 212 void fw_core_handle_bus_reset(struct fw_card *card, int node_id,
 213         int generation, int self_id_count, u32 *self_ids, bool bm_abdicate);
 214 void fw_destroy_nodes(struct fw_card *card);
 215
 216 /*
 217  * Check whether new_generation is the immediate successor of old_generation.
 218  * Take counter roll-over at 255 (as per OHCI) into account.
 219  */
 220 static inline bool is_next_generation(int new_generation, int old_generation)
 221 {
 222         return (new_generation & 0xff) == ((old_generation + 1) & 0xff);
 223 }
 224
 225
 226 /* -transaction */
 227
 228 #define TCODE_LINK_INTERNAL             0xe
 229
 230 #define TCODE_IS_READ_REQUEST(tcode)    (((tcode) & ~1) == 4)
 231 #define TCODE_IS_BLOCK_PACKET(tcode)    (((tcode) &  1) != 0)
 232 #define TCODE_IS_LINK_INTERNAL(tcode)   ((tcode) == TCODE_LINK_INTERNAL)
 233 #define TCODE_IS_REQUEST(tcode)         (((tcode) &  2) == 0)
 234 #define TCODE_IS_RESPONSE(tcode)        (((tcode) &  2) != 0)
 235 #define TCODE_HAS_REQUEST_DATA(tcode)   (((tcode) & 12) != 4)
 236 #define TCODE_HAS_RESPONSE_DATA(tcode)  (((tcode) & 12) != 0)
 237
 238 #define LOCAL_BUS 0xffc0
 239
 240 /* OHCI-1394's default upper bound for physical DMA: 4 GB */
 241 #define FW_MAX_PHYSICAL_RANGE           (1ULL << 32)
 242
 243 void fw_core_handle_request(struct fw_card *card, struct fw_packet *request);
 244 void fw_core_handle_response(struct fw_card *card, struct fw_packet *packet);
 245 int fw_get_response_length(struct fw_request *request);
 246 void fw_fill_response(struct fw_packet *response, u32 *request_header,
 247                       int rcode, void *payload, size_t length);
 248
 249 #define FW_PHY_CONFIG_NO_NODE_ID        -1
 250 #define FW_PHY_CONFIG_CURRENT_GAP_COUNT -1
 251 void fw_send_phy_config(struct fw_card *card,
 252                         int node_id, int generation, int gap_count);
 253
 254 static inline bool is_ping_packet(u32 *data)
 255 {
 256         return (data[0] & 0xc0ffffff) == 0 && ~data[0] == data[1];
 257 }
 258
 259 #endif /* _FIREWIRE_CORE_H */