drivers/ieee1394/ieee1394_core.h

   1
   2 #ifndef _IEEE1394_CORE_H
   3 #define _IEEE1394_CORE_H
   4
   5 #include <linux/slab.h>
   6 #include <asm/atomic.h>
   7 #include <asm/semaphore.h>
   8 #include "hosts.h"
   9
  10
  11 struct hpsb_packet {
  12         /* This struct is basically read-only for hosts with the exception of
  13          * the data buffer contents and xnext - see below. */
  14
  15         /* This can be used for host driver internal linking.
  16          *
  17          * NOTE: This must be left in init state when the driver is done
  18          * with it (e.g. by using list_del_init()), since the core does
  19          * some sanity checks to make sure the packet is not on a
  20          * driver_list when free'ing it. */
  21         struct list_head driver_list;
  22
  23         nodeid_t node_id;
  24
  25         /* Async and Iso types should be clear, raw means send-as-is, do not
  26          * CRC!  Byte swapping shall still be done in this case. */
  27         enum { hpsb_async, hpsb_iso, hpsb_raw } __attribute__((packed)) type;
  28
  29         /* Okay, this is core internal and a no care for hosts.
  30          * queued   = queued for sending
  31          * pending  = sent, waiting for response
  32          * complete = processing completed, successful or not
  33          */
  34         enum {
  35                 hpsb_unused, hpsb_queued, hpsb_pending, hpsb_complete
  36         } __attribute__((packed)) state;
  37
  38         /* These are core internal. */
  39         signed char tlabel;
  40         signed char ack_code;
  41         unsigned char tcode;
  42
  43         unsigned expect_response:1;
  44         unsigned no_waiter:1;
  45
  46         /* Speed to transmit with: 0 = 100Mbps, 1 = 200Mbps, 2 = 400Mbps */
  47         unsigned speed_code:2;
  48
  49         /*
  50          * *header and *data are guaranteed to be 32-bit DMAable and may be
  51          * overwritten to allow in-place byte swapping.  Neither of these is
  52          * CRCed (the sizes also don't include CRC), but contain space for at
  53          * least one additional quadlet to allow in-place CRCing.  The memory is
  54          * also guaranteed to be DMA mappable.
  55          */
  56         quadlet_t *header;
  57         quadlet_t *data;
  58         size_t header_size;
  59         size_t data_size;
  60
  61
  62         struct hpsb_host *host;
  63         unsigned int generation;
  64
  65         atomic_t refcnt;
  66
  67         /* Function (and possible data to pass to it) to call when this
  68          * packet is completed.  */
  69         void (*complete_routine)(void *);
  70         void *complete_data;
  71
  72         /* XXX This is just a hack at the moment */
  73         struct sk_buff *skb;
  74
  75         /* Store jiffies for implementing bus timeouts. */
  76         unsigned long sendtime;
  77
  78         quadlet_t embedded_header[5];
  79 };
  80
  81 /* Set a task for when a packet completes */
  82 void hpsb_set_packet_complete_task(struct hpsb_packet *packet,
  83                 void (*routine)(void *), void *data);
  84
  85 static inline struct hpsb_packet *driver_packet(struct list_head *l)
  86 {
  87         return list_entry(l, struct hpsb_packet, driver_list);
  88 }
  89
  90 void abort_timedouts(unsigned long __opaque);
  91
  92 struct hpsb_packet *hpsb_alloc_packet(size_t data_size);
  93 void hpsb_free_packet(struct hpsb_packet *packet);
  94
  95
  96 /*
  97  * Generation counter for the complete 1394 subsystem.  Generation gets
  98  * incremented on every change in the subsystem (e.g. bus reset).
  99  *
 100  * Use the functions, not the variable.
 101  */
 102 static inline unsigned int get_hpsb_generation(struct hpsb_host *host)
 103 {
 104         return atomic_read(&host->generation);
 105 }
 106
 107 /*
 108  * Send a PHY configuration packet, return 0 on success, negative
 109  * errno on failure.
 110  */
 111 int hpsb_send_phy_config(struct hpsb_host *host, int rootid, int gapcnt);
 112
 113 /*
 114  * Queue packet for transmitting, return 0 on success, negative errno
 115  * on failure.
 116  */
 117 int hpsb_send_packet(struct hpsb_packet *packet);
 118
 119 /*
 120  * Queue packet for transmitting, and block until the transaction
 121  * completes. Return 0 on success, negative errno on failure.
 122  */
 123 int hpsb_send_packet_and_wait(struct hpsb_packet *packet);
 124
 125 /* Initiate bus reset on the given host.  Returns 1 if bus reset already in
 126  * progress, 0 otherwise. */
 127 int hpsb_reset_bus(struct hpsb_host *host, int type);
 128
 129 /*
 130  * The following functions are exported for host driver module usage.  All of
 131  * them are safe to use in interrupt contexts, although some are quite
 132  * complicated so you may want to run them in bottom halves instead of calling
 133  * them directly.
 134  */
 135
 136 /* Notify a bus reset to the core.  Returns 1 if bus reset already in progress,
 137  * 0 otherwise. */
 138 int hpsb_bus_reset(struct hpsb_host *host);
 139
 140 /*
 141  * Hand over received selfid packet to the core.  Complement check (second
 142  * quadlet is complement of first) is expected to be done and succesful.
 143  */
 144 void hpsb_selfid_received(struct hpsb_host *host, quadlet_t sid);
 145
 146 /*
 147  * Notify completion of SelfID stage to the core and report new physical ID
 148  * and whether host is root now.
 149  */
 150 void hpsb_selfid_complete(struct hpsb_host *host, int phyid, int isroot);
 151
 152 /*
 153  * Notify core of sending a packet.  Ackcode is the ack code returned for async
 154  * transmits or ACKX_SEND_ERROR if the transmission failed completely; ACKX_NONE
 155  * for other cases (internal errors that don't justify a panic).  Safe to call
 156  * from within a transmit packet routine.
 157  */
 158 void hpsb_packet_sent(struct hpsb_host *host, struct hpsb_packet *packet,
 159                       int ackcode);
 160
 161 /*
 162  * Hand over received packet to the core.  The contents of data are expected to
 163  * be the full packet but with the CRCs left out (data block follows header
 164  * immediately), with the header (i.e. the first four quadlets) in machine byte
 165  * order and the data block in big endian.  *data can be safely overwritten
 166  * after this call.
 167  *
 168  * If the packet is a write request, write_acked is to be set to true if it was
 169  * ack_complete'd already, false otherwise.  This arg is ignored for any other
 170  * packet type.
 171  */
 172 void hpsb_packet_received(struct hpsb_host *host, quadlet_t *data, size_t size,
 173                           int write_acked);
 174
 175
 176 /*
 177  * CHARACTER DEVICE DISPATCHING
 178  *
 179  * All ieee1394 character device drivers share the same major number
 180  * (major 171).  The 256 minor numbers are allocated to the various
 181  * task-specific interfaces (raw1394, video1394, dv1394, etc) in
 182  * blocks of 16.
 183  *
 184  * The core ieee1394.o module allocates the device number region
 185  * 171:0-255, the various drivers must then cdev_add() their cdev
 186  * objects to handle their respective sub-regions.
 187  *
 188  * Minor device number block allocations:
 189  *
 190  * Block 0  (  0- 15)  raw1394
 191  * Block 1  ( 16- 31)  video1394
 192  * Block 2  ( 32- 47)  dv1394
 193  *
 194  * Blocks 3-14 free for future allocation
 195  *
 196  * Block 15 (240-255)  reserved for drivers under development, etc.
 197  */
 198
 199 #define IEEE1394_MAJOR                   171
 200
 201 #define IEEE1394_MINOR_BLOCK_RAW1394       0
 202 #define IEEE1394_MINOR_BLOCK_VIDEO1394     1
 203 #define IEEE1394_MINOR_BLOCK_DV1394        2
 204 #define IEEE1394_MINOR_BLOCK_EXPERIMENTAL 15
 205
 206 #define IEEE1394_CORE_DEV         MKDEV(IEEE1394_MAJOR, 0)
 207 #define IEEE1394_RAW1394_DEV      MKDEV(IEEE1394_MAJOR, IEEE1394_MINOR_BLOCK_RAW1394 * 16)
 208 #define IEEE1394_VIDEO1394_DEV    MKDEV(IEEE1394_MAJOR, IEEE1394_MINOR_BLOCK_VIDEO1394 * 16)
 209 #define IEEE1394_DV1394_DEV       MKDEV(IEEE1394_MAJOR, IEEE1394_MINOR_BLOCK_DV1394 * 16)
 210 #define IEEE1394_EXPERIMENTAL_DEV MKDEV(IEEE1394_MAJOR, IEEE1394_MINOR_BLOCK_EXPERIMENTAL * 16)
 211
 212 /* return the index (within a minor number block) of a file */
 213 static inline unsigned char ieee1394_file_to_instance(struct file *file)
 214 {
 215         return file->f_dentry->d_inode->i_cindex;
 216 }
 217
 218 extern int hpsb_disable_irm;
 219
 220 /* Our sysfs bus entry */
 221 extern struct bus_type ieee1394_bus_type;
 222 extern struct class hpsb_host_class;
 223 extern struct class *hpsb_protocol_class;
 224
 225 #endif /* _IEEE1394_CORE_H */
 226