atariints.h (5691B)
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 115static 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 125static 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 136static 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 157static 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 164static 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 176static 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 183static 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 191static 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 198static 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 205unsigned int atari_register_vme_int(void); 206void atari_unregister_vme_int(unsigned int); 207 208#endif /* linux/atariints.h */