drivers/s390/char/tapedefs.h

   1 /***********************************************************************
   2  *  drivers/s390/char/tapedefs.h
   3  *    tape device driver for S/390 and zSeries tapes.
   4  *
   5  *  S390 and zSeries version
   6  *    Copyright (C) 2001 IBM Corporation
   7  *    Author(s):  Carsten Otte <cotte@de.ibm.com>
   8  *                Tuan Ngo-Anh <ngoanh@de.ibm.com>
   9  *
  10  *
  11  ***********************************************************************
  12  */
  13
  14 /* Kernel Version Compatibility section */
  15 #include <linux/version.h>
  16 #include <linux/blkdev.h>
  17 #include <linux/blk.h>
  18 #include <asm/irq.h>
  19
  20 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,2,17))
  21 #define TAPE_DEBUG               // use s390 debug feature
  22 #else
  23 #undef TAPE_DEBUG                // debug feature not supported by our 2.2.16 code
  24 static inline void set_normalized_cda ( ccw1_t * cp, unsigned long address ) {
  25     cp -> cda = address;
  26 }
  27 static inline void clear_normalized_cda ( ccw1_t * ccw ) {
  28     ccw -> cda = 0;
  29 }
  30 #define BUG() PRINT_FATAL("tape390: CRITICAL INTERNAL ERROR OCCURED. REPORT THIS BACK TO LINUX390@DE.IBM.COM\n")
  31 #endif
  32 #define CONFIG_S390_TAPE_DYNAMIC // allow devices to be attached or detached on the fly
  33 #define TAPEBLOCK_RETRIES 20     // number of retries, when a block-dev request fails.
  34
  35
  36 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,3,98))
  37 #define INIT_BLK_DEV(d_major,d_request_fn,d_queue_fn,d_current) \
  38 do { \
  39         blk_dev[d_major].queue = d_queue_fn; \
  40 } while(0)
  41 static inline struct request *
  42 tape_next_request( request_queue_t *queue )
  43 {
  44         return blkdev_entry_next_request(&queue->queue_head);
  45 }
  46 static inline void
  47 tape_dequeue_request( request_queue_t * q, struct request *req )
  48 {
  49         blkdev_dequeue_request (req);
  50 }
  51 #else
  52 #define s390_dev_info_t dev_info_t
  53 typedef struct request *request_queue_t;
  54 #ifndef init_waitqueue_head
  55 #define init_waitqueue_head(x) do { *x = NULL; } while(0)
  56 #endif
  57 #define blk_init_queue(x,y) do {} while(0)
  58 #define blk_queue_headactive(x,y) do {} while(0)
  59 #define INIT_BLK_DEV(d_major,d_request_fn,d_queue_fn,d_current) \
  60 do { \
  61         blk_dev[d_major].request_fn = d_request_fn; \
  62         blk_dev[d_major].queue = d_queue_fn; \
  63         blk_dev[d_major].current_request = d_current; \
  64 } while(0)
  65 static inline struct request *
  66 tape_next_request( request_queue_t *queue )
  67 {
  68     return *queue;
  69 }
  70 static inline void
  71 tape_dequeue_request( request_queue_t * q, struct request *req )
  72 {
  73         *q = req->next;
  74         req->next = NULL;
  75 }
  76 #endif