drivers/ieee1394/ieee1394_core.h

   1 #ifndef _IEEE1394_CORE_H
   2 #define _IEEE1394_CORE_H
   3
   4 #include <linux/device.h>
   5 #include <linux/fs.h>
   6 #include <linux/list.h>
   7 #include <linux/types.h>
   8 #include <linux/cdev.h>
   9 #include <asm/atomic.h>
  10
  11 #include "hosts.h"
  12 #include "ieee1394_types.h"
  13
  14 struct hpsb_packet {
  15         /* This struct is basically read-only for hosts with the exception of
  16          * the data buffer contents and driver_list. */
  17
  18         /* This can be used for host driver internal linking.
  19          *
  20          * NOTE: This must be left in init state when the driver is done
  21          * with it (e.g. by using list_del_init()), since the core does
  22          * some sanity checks to make sure the packet is not on a
  23          * driver_list when free'ing it. */
  24         struct list_head driver_list;
  25
  26         nodeid_t node_id;
  27
  28         /* hpsb_raw = send as-is, do not CRC (but still byte-swap it) */
  29         enum { hpsb_async, hpsb_raw } __attribute__((packed)) type;
  30
  31         /* Okay, this is core internal and a no care for hosts.
  32          * queued   = queued for sending
  33          * pending  = sent, waiting for response
  34          * complete = processing completed, successful or not
  35          */
  36         enum {
  37                 hpsb_unused, hpsb_queued, hpsb_pending, hpsb_complete
  38         } __attribute__((packed)) state;
  39
  40         /* These are core-internal. */
  41         signed char tlabel;
  42         signed char ack_code;
  43         unsigned char tcode;
  44
  45         unsigned expect_response:1;
  46         unsigned no_waiter:1;
  47
  48         /* Speed to transmit with: 0 = 100Mbps, 1 = 200Mbps, 2 = 400Mbps */
  49         unsigned speed_code:2;
  50
  51         struct hpsb_host *host;
  52         unsigned int generation;
  53
  54         atomic_t refcnt;
  55         struct list_head queue;
  56
  57         /* Function (and possible data to pass to it) to call when this
  58          * packet is completed.  */
  59         void (*complete_routine)(void *);
  60         void *complete_data;
  61
  62         /* Store jiffies for implementing bus timeouts. */
  63         unsigned long sendtime;
  64
  65         /* Core-internal.  */
  66         size_t allocated_data_size;     /* as allocated */
  67
  68         /* Sizes are in bytes. To be set by caller of hpsb_alloc_packet. */
  69         size_t data_size;               /* as filled in */
  70         size_t header_size;             /* as filled in, not counting the CRC */
  71
  72         /* Buffers */
  73         quadlet_t *data;                /* can be DMA-mapped */
  74         quadlet_t header[5];
  75         quadlet_t embedded_data[0];     /* keep as last member */
  76 };
  77
  78 void hpsb_set_packet_complete_task(struct hpsb_packet *packet,
  79                                    void (*routine)(void *), void *data);
  80 static inline struct hpsb_packet *driver_packet(struct list_head *l)
  81 {
  82         return list_entry(l, struct hpsb_packet, driver_list);
  83 }
  84 void abort_timedouts(unsigned long __opaque);
  85 struct hpsb_packet *hpsb_alloc_packet(size_t data_size);
  86 void hpsb_free_packet(struct hpsb_packet *packet);
  87
  88 /**
  89  * get_hpsb_generation - generation counter for the complete 1394 subsystem
  90  *
  91  * Generation gets incremented on every change in the subsystem (notably on bus
  92  * resets). Use the functions, not the variable.
  93  */
  94 static inline unsigned int get_hpsb_generation(struct hpsb_host *host)
  95 {
  96         return atomic_read(&host->generation);
  97 }
  98
  99 int hpsb_send_phy_config(struct hpsb_host *host, int rootid, int gapcnt);
 100 int hpsb_send_packet(struct hpsb_packet *packet);
 101 int hpsb_send_packet_and_wait(struct hpsb_packet *packet);
 102 int hpsb_reset_bus(struct hpsb_host *host, int type);
 103 int hpsb_read_cycle_timer(struct hpsb_host *host, u32 *cycle_timer,
 104                           u64 *local_time);
 105
 106 int hpsb_bus_reset(struct hpsb_host *host);
 107 void hpsb_selfid_received(struct hpsb_host *host, quadlet_t sid);
 108 void hpsb_selfid_complete(struct hpsb_host *host, int phyid, int isroot);
 109 void hpsb_packet_sent(struct hpsb_host *host, struct hpsb_packet *packet,
 110                       int ackcode);
 111 void hpsb_packet_received(struct hpsb_host *host, quadlet_t *data, size_t size,
 112                           int write_acked);
 113
 114 /*
 115  * CHARACTER DEVICE DISPATCHING
 116  *
 117  * All ieee1394 character device drivers share the same major number
 118  * (major 171).  The 256 minor numbers are allocated to the various
 119  * task-specific interfaces (raw1394, video1394, dv1394, etc) in
 120  * blocks of 16.
 121  *
 122  * The core ieee1394.o module allocates the device number region
 123  * 171:0-255, the various drivers must then cdev_add() their cdev
 124  * objects to handle their respective sub-regions.
 125  *
 126  * Minor device number block allocations:
 127  *
 128  * Block 0  (  0- 15)  raw1394
 129  * Block 1  ( 16- 31)  video1394
 130  * Block 2  ( 32- 47)  dv1394
 131  *
 132  * Blocks 3-14 free for future allocation
 133  *
 134  * Block 15 (240-255)  reserved for drivers under development, etc.
 135  */
 136
 137 #define IEEE1394_MAJOR                   171
 138
 139 #define IEEE1394_MINOR_BLOCK_RAW1394       0
 140 #define IEEE1394_MINOR_BLOCK_VIDEO1394     1
 141 #define IEEE1394_MINOR_BLOCK_DV1394        2
 142 #define IEEE1394_MINOR_BLOCK_EXPERIMENTAL 15
 143
 144 #define IEEE1394_CORE_DEV         MKDEV(IEEE1394_MAJOR, 0)
 145 #define IEEE1394_RAW1394_DEV      MKDEV(IEEE1394_MAJOR, \
 146                                         IEEE1394_MINOR_BLOCK_RAW1394 * 16)
 147 #define IEEE1394_VIDEO1394_DEV    MKDEV(IEEE1394_MAJOR, \
 148                                         IEEE1394_MINOR_BLOCK_VIDEO1394 * 16)
 149 #define IEEE1394_DV1394_DEV       MKDEV(IEEE1394_MAJOR, \
 150                                         IEEE1394_MINOR_BLOCK_DV1394 * 16)
 151 #define IEEE1394_EXPERIMENTAL_DEV MKDEV(IEEE1394_MAJOR, \
 152                                         IEEE1394_MINOR_BLOCK_EXPERIMENTAL * 16)
 153
 154 /**
 155  * ieee1394_file_to_instance - get the index within a minor number block
 156  */
 157 static inline unsigned char ieee1394_file_to_instance(struct file *file)
 158 {
 159         int idx = cdev_index(file->f_path.dentry->d_inode);
 160         if (idx < 0)
 161                 idx = 0;
 162         return idx;
 163 }
 164
 165 extern int hpsb_disable_irm;
 166
 167 /* Our sysfs bus entry */
 168 extern struct bus_type ieee1394_bus_type;
 169 extern struct class hpsb_host_class;
 170 extern struct class *hpsb_protocol_class;
 171
 172 #endif /* _IEEE1394_CORE_H */