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 122static 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 132static 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 143static 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 164static 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 171static 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 183extern 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 190extern 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 198extern 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 205extern 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 212unsigned long atari_register_vme_int( void ); 213void atari_unregister_vme_int( unsigned long ); 214 215#endif /* linux/atariints.h */ 216