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 #define IRQ_SPURIOUS      (0)
  49
  50 /* auto-vector interrupts */
  51 #define IRQ_AUTO_1        (1)
  52 #define IRQ_AUTO_2        (2)
  53 #define IRQ_AUTO_3        (3)
  54 #define IRQ_AUTO_4        (4)
  55 #define IRQ_AUTO_5        (5)
  56 #define IRQ_AUTO_6        (6)
  57 #define IRQ_AUTO_7        (7)
  58
  59 /* ST-MFP interrupts */
  60 #define IRQ_MFP_BUSY      (8)
  61 #define IRQ_MFP_DCD       (9)
  62 #define IRQ_MFP_CTS       (10)
  63 #define IRQ_MFP_GPU       (11)
  64 #define IRQ_MFP_TIMD      (12)
  65 #define IRQ_MFP_TIMC      (13)
  66 #define IRQ_MFP_ACIA      (14)
  67 #define IRQ_MFP_FDC       (15)
  68 #define IRQ_MFP_ACSI      IRQ_MFP_FDC
  69 #define IRQ_MFP_FSCSI     IRQ_MFP_FDC
  70 #define IRQ_MFP_IDE       IRQ_MFP_FDC
  71 #define IRQ_MFP_TIMB      (16)
  72 #define IRQ_MFP_SERERR    (17)
  73 #define IRQ_MFP_SEREMPT   (18)
  74 #define IRQ_MFP_RECERR    (19)
  75 #define IRQ_MFP_RECFULL   (20)
  76 #define IRQ_MFP_TIMA      (21)
  77 #define IRQ_MFP_RI        (22)
  78 #define IRQ_MFP_MMD       (23)
  79
  80 /* TT-MFP interrupts */
  81 #define IRQ_TT_MFP_IO0       (24)
  82 #define IRQ_TT_MFP_IO1       (25)
  83 #define IRQ_TT_MFP_SCC       (26)
  84 #define IRQ_TT_MFP_RI        (27)
  85 #define IRQ_TT_MFP_TIMD      (28)
  86 #define IRQ_TT_MFP_TIMC      (29)
  87 #define IRQ_TT_MFP_DRVRDY    (30)
  88 #define IRQ_TT_MFP_SCSIDMA   (31)
  89 #define IRQ_TT_MFP_TIMB      (32)
  90 #define IRQ_TT_MFP_SERERR    (33)
  91 #define IRQ_TT_MFP_SEREMPT   (34)
  92 #define IRQ_TT_MFP_RECERR    (35)
  93 #define IRQ_TT_MFP_RECFULL   (36)
  94 #define IRQ_TT_MFP_TIMA      (37)
  95 #define IRQ_TT_MFP_RTC       (38)
  96 #define IRQ_TT_MFP_SCSI      (39)
  97
  98 /* SCC interrupts */
  99 #define IRQ_SCCB_TX          (40)
 100 #define IRQ_SCCB_STAT        (42)
 101 #define IRQ_SCCB_RX          (44)
 102 #define IRQ_SCCB_SPCOND      (46)
 103 #define IRQ_SCCA_TX          (48)
 104 #define IRQ_SCCA_STAT        (50)
 105 #define IRQ_SCCA_RX          (52)
 106 #define IRQ_SCCA_SPCOND      (54)
 107
 108
 109 #define INT_CLK   24576     /* CLK while int_clk =2.456MHz and divide = 100 */
 110 #define INT_TICKS 246       /* to make sched_time = 99.902... HZ */
 111
 112
 113 #define MFP_ENABLE      0
 114 #define MFP_PENDING     1
 115 #define MFP_SERVICE     2
 116 #define MFP_MASK        3
 117
 118 /* Utility functions for setting/clearing bits in the interrupt registers of
 119  * the MFP. 'type' should be constant, if 'irq' is constant, too, code size is
 120  * reduced. set_mfp_bit() is nonsense for PENDING and SERVICE registers. */
 121
 122 static inline int get_mfp_bit( unsigned irq, int type )
 123
 124 {       unsigned char   mask, *reg;
 125
 126         mask = 1 << (irq & 7);
 127         reg = (unsigned char *)&mfp.int_en_a + type*4 +
 128                   ((irq & 8) >> 2) + (((irq-8) & 16) << 3);
 129         return( *reg & mask );
 130 }
 131
 132 static inline void set_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         __asm__ __volatile__ ( "orb %0,%1"
 140                               : : "di" (mask), "m" (*reg) : "memory" );
 141 }
 142
 143 static inline void clear_mfp_bit( unsigned irq, int type )
 144
 145 {       unsigned char   mask, *reg;
 146
 147         mask = ~(1 << (irq & 7));
 148         reg = (unsigned char *)&mfp.int_en_a + type*4 +
 149                   ((irq & 8) >> 2) + (((irq-8) & 16) << 3);
 150         if (type == MFP_PENDING || type == MFP_SERVICE)
 151                 __asm__ __volatile__ ( "moveb %0,%1"
 152                                       : : "di" (mask), "m" (*reg) : "memory" );
 153         else
 154                 __asm__ __volatile__ ( "andb %0,%1"
 155                                       : : "di" (mask), "m" (*reg) : "memory" );
 156 }
 157
 158 /*
 159  * {en,dis}able_irq have the usual semantics of temporary blocking the
 160  * interrupt, but not loosing requests that happen between disabling and
 161  * enabling. This is done with the MFP mask registers.
 162  */
 163
 164 static inline void atari_enable_irq( unsigned irq )
 165
 166 {
 167         if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return;
 168         set_mfp_bit( irq, MFP_MASK );
 169 }
 170
 171 static inline void atari_disable_irq( unsigned irq )
 172
 173 {
 174         if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return;
 175         clear_mfp_bit( irq, MFP_MASK );
 176 }
 177
 178 /*
 179  * In opposite to {en,dis}able_irq, requests between turn{off,on}_irq are not
 180  * "stored"
 181  */
 182
 183 static inline void atari_turnon_irq( unsigned irq )
 184
 185 {
 186         if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return;
 187         set_mfp_bit( irq, MFP_ENABLE );
 188 }
 189
 190 static inline void atari_turnoff_irq( unsigned irq )
 191
 192 {
 193         if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return;
 194         clear_mfp_bit( irq, MFP_ENABLE );
 195         clear_mfp_bit( irq, MFP_PENDING );
 196 }
 197
 198 static inline void atari_clear_pending_irq( unsigned irq )
 199
 200 {
 201         if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return;
 202         clear_mfp_bit( irq, MFP_PENDING );
 203 }
 204
 205 static inline int atari_irq_pending( unsigned irq )
 206
 207 {
 208         if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return( 0 );
 209         return( get_mfp_bit( irq, MFP_PENDING ) );
 210 }
 211
 212 unsigned long atari_register_vme_int( void );
 213 void atari_unregister_vme_int( unsigned long );
 214
 215 #endif /* linux/atariints.h */