include/asm-ia64/sn/driver.h

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 1992 - 1997, 2000-2003 Silicon Graphics, Inc. All rights reserved.
   7  */
   8 #ifndef _ASM_IA64_SN_DRIVER_H
   9 #define _ASM_IA64_SN_DRIVER_H
  10
  11 #include <asm/sn/sgi.h>
  12 #include <asm/types.h>
  13
  14 /*
  15 ** Interface for device driver handle management.
  16 **
  17 ** These functions are mostly for use by the loadable driver code, and
  18 ** for use by I/O bus infrastructure code.
  19 */
  20
  21 typedef struct device_driver_s *device_driver_t;
  22
  23 /* == Driver thread priority support == */
  24 typedef int ilvl_t;
  25
  26 struct eframe_s;
  27 struct piomap;
  28 struct dmamap;
  29
  30 typedef unsigned long iobush_t;
  31
  32 /* interrupt function */
  33 typedef void           *intr_arg_t;
  34 typedef void            intr_func_f(intr_arg_t);
  35 typedef intr_func_f    *intr_func_t;
  36
  37 #define INTR_ARG(n)     ((intr_arg_t)(__psunsigned_t)(n))
  38
  39 /* system interrupt resource handle -- returned from intr_alloc */
  40 typedef struct intr_s *intr_t;
  41 #define INTR_HANDLE_NONE ((intr_t)0)
  42
  43 /*
  44  * restore interrupt level value, returned from intr_block_level
  45  * for use with intr_unblock_level.
  46  */
  47 typedef void *rlvl_t;
  48
  49
  50 /*
  51  * A basic, platform-independent description of I/O requirements for
  52  * a device. This structure is usually formed by lboot based on information
  53  * in configuration files.  It contains information about PIO, DMA, and
  54  * interrupt requirements for a specific instance of a device.
  55  *
  56  * The pio description is currently unused.
  57  *
  58  * The dma description describes bandwidth characteristics and bandwidth
  59  * allocation requirements. (TBD)
  60  *
  61  * The Interrupt information describes the priority of interrupt, desired
  62  * destination, policy (TBD), whether this is an error interrupt, etc.
  63  * For now, interrupts are targeted to specific CPUs.
  64  */
  65
  66 typedef struct device_desc_s {
  67         /* pio description (currently none) */
  68
  69         /* dma description */
  70         /* TBD: allocated badwidth requirements */
  71
  72         /* interrupt description */
  73         vertex_hdl_t    intr_target;    /* Hardware locator string */
  74         int             intr_policy;    /* TBD */
  75         ilvl_t          intr_swlevel;   /* software level for blocking intr */
  76         char            *intr_name;     /* name of interrupt, if any */
  77
  78         int             flags;
  79 } *device_desc_t;
  80
  81 /* flag values */
  82 #define D_INTR_ISERR    0x1             /* interrupt is for error handling */
  83 #define D_IS_ASSOC      0x2             /* descriptor is associated with a dev */
  84 #define D_INTR_NOTHREAD 0x4             /* Interrupt handler isn't threaded. */
  85
  86 #define INTR_SWLEVEL_NOTHREAD_DEFAULT   0       /* Default
  87                                                  * Interrupt level in case of
  88                                                  * non-threaded interrupt
  89                                                  * handlers
  90                                                  */
  91 #endif /* _ASM_IA64_SN_DRIVER_H */