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