include/asm-m68k/atariints.h

   1 /*
   2 ** atariints.h -- Atari Linux interrupt handling structs and prototypes
   3 **
   4 ** Copyright 1994 by Bj”rn Brauel
   5 **
   6 ** 5/2/94 Roman Hodek:
   7 **   TT interrupt definitions added.
   8 **
   9 ** 12/02/96: (Roman)
  10 **   Adapted to new int handling scheme (see ataints.c); revised numbering
  11 **
  12 ** This file is subject to the terms and conditions of the GNU General Public
  13 ** License.  See the file COPYING in the main directory of this archive
  14 ** for more details.
  15 **
  16 */
  17
  18 #ifndef _LINUX_ATARIINTS_H_
  19 #define _LINUX_ATARIINTS_H_
  20
  21 #include <asm/irq.h>
  22 #include <asm/atarihw.h>
  23
  24 /*
  25 ** Atari Interrupt sources.
  26 **
  27 */
  28
  29 #define STMFP_SOURCE_BASE  8
  30 #define TTMFP_SOURCE_BASE  24
  31 #define SCC_SOURCE_BASE    40
  32 #define VME_SOURCE_BASE    56
  33 #define VME_MAX_SOURCES    16
  34
  35 #define NUM_ATARI_SOURCES   (VME_SOURCE_BASE+VME_MAX_SOURCES-STMFP_SOURCE_BASE)
  36
  37 /* convert vector number to int source number */
  38 #define IRQ_VECTOR_TO_SOURCE(v) ((v) - ((v) < 0x20 ? 0x18 : (0x40-8)))
  39
  40 /* convert irq_handler index to vector number */
  41 #define IRQ_SOURCE_TO_VECTOR(i) ((i) + ((i) < 8 ? 0x18 : (0x40-8)))
  42
  43 /* interrupt service types */
  44 #define IRQ_TYPE_SLOW     0
  45 #define IRQ_TYPE_FAST     1
  46 #define IRQ_TYPE_PRIO     2
  47
  48 /* ST-MFP interrupts */
  49 #define IRQ_MFP_BUSY      (8)
  50 #define IRQ_MFP_DCD       (9)
  51 #define IRQ_MFP_CTS       (10)
  52 #define IRQ_MFP_GPU       (11)
  53 #define IRQ_MFP_TIMD      (12)
  54 #define IRQ_MFP_TIMC      (13)
  55 #define IRQ_MFP_ACIA      (14)
  56 #define IRQ_MFP_FDC       (15)
  57 #define IRQ_MFP_ACSI      IRQ_MFP_FDC
  58 #define IRQ_MFP_FSCSI     IRQ_MFP_FDC
  59 #define IRQ_MFP_IDE       IRQ_MFP_FDC
  60 #define IRQ_MFP_TIMB      (16)
  61 #define IRQ_MFP_SERERR    (17)
  62 #define IRQ_MFP_SEREMPT   (18)
  63 #define IRQ_MFP_RECERR    (19)
  64 #define IRQ_MFP_RECFULL   (20)
  65 #define IRQ_MFP_TIMA      (21)
  66 #define IRQ_MFP_RI        (22)
  67 #define IRQ_MFP_MMD       (23)
  68
  69 /* TT-MFP interrupts */
  70 #define IRQ_TT_MFP_IO0       (24)
  71 #define IRQ_TT_MFP_IO1       (25)
  72 #define IRQ_TT_MFP_SCC       (26)
  73 #define IRQ_TT_MFP_RI        (27)
  74 #define IRQ_TT_MFP_TIMD      (28)
  75 #define IRQ_TT_MFP_TIMC      (29)
  76 #define IRQ_TT_MFP_DRVRDY    (30)
  77 #define IRQ_TT_MFP_SCSIDMA   (31)
  78 #define IRQ_TT_MFP_TIMB      (32)
  79 #define IRQ_TT_MFP_SERERR    (33)
  80 #define IRQ_TT_MFP_SEREMPT   (34)
  81 #define IRQ_TT_MFP_RECERR    (35)
  82 #define IRQ_TT_MFP_RECFULL   (36)
  83 #define IRQ_TT_MFP_TIMA      (37)
  84 #define IRQ_TT_MFP_RTC       (38)
  85 #define IRQ_TT_MFP_SCSI      (39)
  86
  87 /* SCC interrupts */
  88 #define IRQ_SCCB_TX          (40)
  89 #define IRQ_SCCB_STAT        (42)
  90 #define IRQ_SCCB_RX          (44)
  91 #define IRQ_SCCB_SPCOND      (46)
  92 #define IRQ_SCCA_TX          (48)
  93 #define IRQ_SCCA_STAT        (50)
  94 #define IRQ_SCCA_RX          (52)
  95 #define IRQ_SCCA_SPCOND      (54)
  96
  97
  98 #define INT_CLK   24576     /* CLK while int_clk =2.456MHz and divide = 100 */
  99 #define INT_TICKS 246       /* to make sched_time = 99.902... HZ */
 100
 101
 102 #define MFP_ENABLE      0
 103 #define MFP_PENDING     1
 104 #define MFP_SERVICE     2
 105 #define MFP_MASK        3
 106
 107 /* Utility functions for setting/clearing bits in the interrupt registers of
 108  * the MFP. 'type' should be constant, if 'irq' is constant, too, code size is
 109  * reduced. set_mfp_bit() is nonsense for PENDING and SERVICE registers. */
 110
 111 static inline int get_mfp_bit( unsigned irq, int type )
 112
 113 {       unsigned char   mask, *reg;
 114
 115         mask = 1 << (irq & 7);
 116         reg = (unsigned char *)&mfp.int_en_a + type*4 +
 117                   ((irq & 8) >> 2) + (((irq-8) & 16) << 3);
 118         return( *reg & mask );
 119 }
 120
 121 static inline void set_mfp_bit( unsigned irq, int type )
 122
 123 {       unsigned char   mask, *reg;
 124
 125         mask = 1 << (irq & 7);
 126         reg = (unsigned char *)&mfp.int_en_a + type*4 +
 127                   ((irq & 8) >> 2) + (((irq-8) & 16) << 3);
 128         __asm__ __volatile__ ( "orb %0,%1"
 129                               : : "di" (mask), "m" (*reg) : "memory" );
 130 }
 131
 132 static inline void clear_mfp_bit( unsigned irq, int type )
 133
 134 {       unsigned char   mask, *reg;
 135
 136         mask = ~(1 << (irq & 7));
 137         reg = (unsigned char *)&mfp.int_en_a + type*4 +
 138                   ((irq & 8) >> 2) + (((irq-8) & 16) << 3);
 139         if (type == MFP_PENDING || type == MFP_SERVICE)
 140                 __asm__ __volatile__ ( "moveb %0,%1"
 141                                       : : "di" (mask), "m" (*reg) : "memory" );
 142         else
 143                 __asm__ __volatile__ ( "andb %0,%1"
 144                                       : : "di" (mask), "m" (*reg) : "memory" );
 145 }
 146
 147 /*
 148  * {en,dis}able_irq have the usual semantics of temporary blocking the
 149  * interrupt, but not loosing requests that happen between disabling and
 150  * enabling. This is done with the MFP mask registers.
 151  */
 152
 153 static inline void atari_enable_irq( unsigned irq )
 154
 155 {
 156         if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return;
 157         set_mfp_bit( irq, MFP_MASK );
 158 }
 159
 160 static inline void atari_disable_irq( unsigned irq )
 161
 162 {
 163         if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return;
 164         clear_mfp_bit( irq, MFP_MASK );
 165 }
 166
 167 /*
 168  * In opposite to {en,dis}able_irq, requests between turn{off,on}_irq are not
 169  * "stored"
 170  */
 171
 172 static inline void atari_turnon_irq( unsigned irq )
 173
 174 {
 175         if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return;
 176         set_mfp_bit( irq, MFP_ENABLE );
 177 }
 178
 179 static inline void atari_turnoff_irq( unsigned irq )
 180
 181 {
 182         if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return;
 183         clear_mfp_bit( irq, MFP_ENABLE );
 184         clear_mfp_bit( irq, MFP_PENDING );
 185 }
 186
 187 static inline void atari_clear_pending_irq( unsigned irq )
 188
 189 {
 190         if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return;
 191         clear_mfp_bit( irq, MFP_PENDING );
 192 }
 193
 194 static inline int atari_irq_pending( unsigned irq )
 195
 196 {
 197         if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return( 0 );
 198         return( get_mfp_bit( irq, MFP_PENDING ) );
 199 }
 200
 201 unsigned long atari_register_vme_int( void );
 202 void atari_unregister_vme_int( unsigned long );
 203
 204 #endif /* linux/atariints.h */