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. */ 114 115 static 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 } 124 125 static 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 } 135 136 static 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 */ 156 157 static 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 } 163 164 static 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 */ 175 176 static 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 } 182 183 static 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 } 190 191 static 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 } 197 198 static 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 } 204 205 unsigned int atari_register_vme_int(void); 206 void atari_unregister_vme_int(unsigned int); 207 208 #endif /* linux/atariints.h */ 209