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