LXR linux/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/* 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/* shared MFP timer D interrupts - hires timer for EtherNEC et al. */
  98#define IRQ_MFP_TIMER1       (64)
  99#define IRQ_MFP_TIMER2       (65)
 100#define IRQ_MFP_TIMER3       (66)
 101#define IRQ_MFP_TIMER4       (67)
 102#define IRQ_MFP_TIMER5       (68)
 103#define IRQ_MFP_TIMER6       (69)
 104#define IRQ_MFP_TIMER7       (70)
 105#define IRQ_MFP_TIMER8       (71)
 106
 107#define INT_CLK   24576     /* CLK while int_clk =2.456MHz and divide = 100 */
 108#define INT_TICKS 246       /* to make sched_time = 99.902... HZ */
 109
 110
 111#define MFP_ENABLE      0
 112#define MFP_PENDING     1
 113#define MFP_SERVICE     2
 114#define MFP_MASK        3
 115
 116/* Utility functions for setting/clearing bits in the interrupt registers of
 117 * the MFP. 'type' should be constant, if 'irq' is constant, too, code size is
 118 * reduced. set_mfp_bit() is nonsense for PENDING and SERVICE registers. */
 119
 120static inline int get_mfp_bit( unsigned irq, int type )
 121
 122{       unsigned char   mask, *reg;
 123
 124        mask = 1 << (irq & 7);
 125        reg = (unsigned char *)&st_mfp.int_en_a + type*4 +
 126                  ((irq & 8) >> 2) + (((irq-8) & 16) << 3);
 127        return( *reg & mask );
 128}
 129
 130static inline void set_mfp_bit( unsigned irq, int type )
 131
 132{       unsigned char   mask, *reg;
 133
 134        mask = 1 << (irq & 7);
 135        reg = (unsigned char *)&st_mfp.int_en_a + type*4 +
 136                  ((irq & 8) >> 2) + (((irq-8) & 16) << 3);
 137        __asm__ __volatile__ ( "orb %0,%1"
 138                              : : "di" (mask), "m" (*reg) : "memory" );
 139}
 140
 141static inline void clear_mfp_bit( unsigned irq, int type )
 142
 143{       unsigned char   mask, *reg;
 144
 145        mask = ~(1 << (irq & 7));
 146        reg = (unsigned char *)&st_mfp.int_en_a + type*4 +
 147                  ((irq & 8) >> 2) + (((irq-8) & 16) << 3);
 148        if (type == MFP_PENDING || type == MFP_SERVICE)
 149                __asm__ __volatile__ ( "moveb %0,%1"
 150                                      : : "di" (mask), "m" (*reg) : "memory" );
 151        else
 152                __asm__ __volatile__ ( "andb %0,%1"
 153                                      : : "di" (mask), "m" (*reg) : "memory" );
 154}
 155
 156/*
 157 * {en,dis}able_irq have the usual semantics of temporary blocking the
 158 * interrupt, but not losing requests that happen between disabling and
 159 * enabling. This is done with the MFP mask registers.
 160 */
 161
 162static inline void atari_enable_irq( unsigned irq )
 163
 164{
 165        if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return;
 166        set_mfp_bit( irq, MFP_MASK );
 167}
 168
 169static inline void atari_disable_irq( unsigned irq )
 170
 171{
 172        if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return;
 173        clear_mfp_bit( irq, MFP_MASK );
 174}
 175
 176/*
 177 * In opposite to {en,dis}able_irq, requests between turn{off,on}_irq are not
 178 * "stored"
 179 */
 180
 181static inline void atari_turnon_irq( unsigned irq )
 182
 183{
 184        if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return;
 185        set_mfp_bit( irq, MFP_ENABLE );
 186}
 187
 188static inline void atari_turnoff_irq( unsigned irq )
 189
 190{
 191        if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return;
 192        clear_mfp_bit( irq, MFP_ENABLE );
 193        clear_mfp_bit( irq, MFP_PENDING );
 194}
 195
 196static inline void atari_clear_pending_irq( unsigned irq )
 197
 198{
 199        if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return;
 200        clear_mfp_bit( irq, MFP_PENDING );
 201}
 202
 203static inline int atari_irq_pending( unsigned irq )
 204
 205{
 206        if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return( 0 );
 207        return( get_mfp_bit( irq, MFP_PENDING ) );
 208}
 209
 210unsigned int atari_register_vme_int(void);
 211void atari_unregister_vme_int(unsigned int);
 212
 213#endif /* linux/atariints.h */
 214