arch/m68k/include/asm/atariints.h

   1 /*
   2 ** atariints.h -- Atari Linux interrupt handling structs and prototypes
   3 **
   4 ** Copyright 1994 by Björn 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  141
  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 /* ST-MFP interrupts */
  44 #define IRQ_MFP_BUSY      (8)
  45 #define IRQ_MFP_DCD       (9)
  46 #define IRQ_MFP_CTS       (10)
  47 #define IRQ_MFP_GPU       (11)
  48 #define IRQ_MFP_TIMD      (12)
  49 #define IRQ_MFP_TIMC      (13)
  50 #define IRQ_MFP_ACIA      (14)
  51 #define IRQ_MFP_FDC       (15)
  52 #define IRQ_MFP_ACSI      IRQ_MFP_FDC
  53 #define IRQ_MFP_FSCSI     IRQ_MFP_FDC
  54 #define IRQ_MFP_IDE       IRQ_MFP_FDC
  55 #define IRQ_MFP_TIMB      (16)
  56 #define IRQ_MFP_SERERR    (17)
  57 #define IRQ_MFP_SEREMPT   (18)
  58 #define IRQ_MFP_RECERR    (19)
  59 #define IRQ_MFP_RECFULL   (20)
  60 #define IRQ_MFP_TIMA      (21)
  61 #define IRQ_MFP_RI        (22)
  62 #define IRQ_MFP_MMD       (23)
  63
  64 /* TT-MFP interrupts */
  65 #define IRQ_TT_MFP_IO0       (24)
  66 #define IRQ_TT_MFP_IO1       (25)
  67 #define IRQ_TT_MFP_SCC       (26)
  68 #define IRQ_TT_MFP_RI        (27)
  69 #define IRQ_TT_MFP_TIMD      (28)
  70 #define IRQ_TT_MFP_TIMC      (29)
  71 #define IRQ_TT_MFP_DRVRDY    (30)
  72 #define IRQ_TT_MFP_SCSIDMA   (31)
  73 #define IRQ_TT_MFP_TIMB      (32)
  74 #define IRQ_TT_MFP_SERERR    (33)
  75 #define IRQ_TT_MFP_SEREMPT   (34)
  76 #define IRQ_TT_MFP_RECERR    (35)
  77 #define IRQ_TT_MFP_RECFULL   (36)
  78 #define IRQ_TT_MFP_TIMA      (37)
  79 #define IRQ_TT_MFP_RTC       (38)
  80 #define IRQ_TT_MFP_SCSI      (39)
  81
  82 /* SCC interrupts */
  83 #define IRQ_SCCB_TX          (40)
  84 #define IRQ_SCCB_STAT        (42)
  85 #define IRQ_SCCB_RX          (44)
  86 #define IRQ_SCCB_SPCOND      (46)
  87 #define IRQ_SCCA_TX          (48)
  88 #define IRQ_SCCA_STAT        (50)
  89 #define IRQ_SCCA_RX          (52)
  90 #define IRQ_SCCA_SPCOND      (54)
  91
  92 /* shared MFP timer D interrupts - hires timer for EtherNEC et al. */
  93 #define IRQ_MFP_TIMER1       (64)
  94 #define IRQ_MFP_TIMER2       (65)
  95 #define IRQ_MFP_TIMER3       (66)
  96 #define IRQ_MFP_TIMER4       (67)
  97 #define IRQ_MFP_TIMER5       (68)
  98 #define IRQ_MFP_TIMER6       (69)
  99 #define IRQ_MFP_TIMER7       (70)
 100 #define IRQ_MFP_TIMER8       (71)
 101
 102 #define INT_CLK   24576     /* CLK while int_clk =2.456MHz and divide = 100 */
 103 #define INT_TICKS 246       /* to make sched_time = 99.902... HZ */
 104
 105
 106 #define MFP_ENABLE      0
 107 #define MFP_PENDING     1
 108 #define MFP_SERVICE     2
 109 #define MFP_MASK        3
 110
 111 /* Utility functions for setting/clearing bits in the interrupt registers of
 112  * the MFP. 'type' should be constant, if 'irq' is constant, too, code size is
 113  * reduced. set_mfp_bit() is nonsense for PENDING and SERVICE registers. */
 114
 115 static inline int get_mfp_bit( unsigned irq, int type )
 116
 117 {       unsigned char   mask, *reg;
 118
 119         mask = 1 << (irq & 7);
 120         reg = (unsigned char *)&st_mfp.int_en_a + type*4 +
 121                   ((irq & 8) >> 2) + (((irq-8) & 16) << 3);
 122         return( *reg & mask );
 123 }
 124
 125 static inline void set_mfp_bit( unsigned irq, int type )
 126
 127 {       unsigned char   mask, *reg;
 128
 129         mask = 1 << (irq & 7);
 130         reg = (unsigned char *)&st_mfp.int_en_a + type*4 +
 131                   ((irq & 8) >> 2) + (((irq-8) & 16) << 3);
 132         __asm__ __volatile__ ( "orb %0,%1"
 133                               : : "di" (mask), "m" (*reg) : "memory" );
 134 }
 135
 136 static inline void clear_mfp_bit( unsigned irq, int type )
 137
 138 {       unsigned char   mask, *reg;
 139
 140         mask = ~(1 << (irq & 7));
 141         reg = (unsigned char *)&st_mfp.int_en_a + type*4 +
 142                   ((irq & 8) >> 2) + (((irq-8) & 16) << 3);
 143         if (type == MFP_PENDING || type == MFP_SERVICE)
 144                 __asm__ __volatile__ ( "moveb %0,%1"
 145                                       : : "di" (mask), "m" (*reg) : "memory" );
 146         else
 147                 __asm__ __volatile__ ( "andb %0,%1"
 148                                       : : "di" (mask), "m" (*reg) : "memory" );
 149 }
 150
 151 /*
 152  * {en,dis}able_irq have the usual semantics of temporary blocking the
 153  * interrupt, but not losing requests that happen between disabling and
 154  * enabling. This is done with the MFP mask registers.
 155  */
 156
 157 static inline void atari_enable_irq( unsigned irq )
 158
 159 {
 160         if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return;
 161         set_mfp_bit( irq, MFP_MASK );
 162 }
 163
 164 static inline void atari_disable_irq( unsigned irq )
 165
 166 {
 167         if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return;
 168         clear_mfp_bit( irq, MFP_MASK );
 169 }
 170
 171 /*
 172  * In opposite to {en,dis}able_irq, requests between turn{off,on}_irq are not
 173  * "stored"
 174  */
 175
 176 static inline void atari_turnon_irq( unsigned irq )
 177
 178 {
 179         if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return;
 180         set_mfp_bit( irq, MFP_ENABLE );
 181 }
 182
 183 static inline void atari_turnoff_irq( unsigned irq )
 184
 185 {
 186         if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return;
 187         clear_mfp_bit( irq, MFP_ENABLE );
 188         clear_mfp_bit( irq, MFP_PENDING );
 189 }
 190
 191 static inline void atari_clear_pending_irq( unsigned irq )
 192
 193 {
 194         if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return;
 195         clear_mfp_bit( irq, MFP_PENDING );
 196 }
 197
 198 static inline int atari_irq_pending( unsigned irq )
 199
 200 {
 201         if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return( 0 );
 202         return( get_mfp_bit( irq, MFP_PENDING ) );
 203 }
 204
 205 unsigned int atari_register_vme_int(void);
 206 void atari_unregister_vme_int(unsigned int);
 207
 208 #endif /* linux/atariints.h */