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