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208 lines
5.6 KiB
208 lines
5.6 KiB
/* |
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** atariints.h -- Atari Linux interrupt handling structs and prototypes |
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** |
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** Copyright 1994 by Björn Brauel |
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** |
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** 5/2/94 Roman Hodek: |
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** TT interrupt definitions added. |
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** |
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** 12/02/96: (Roman) |
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** Adapted to new int handling scheme (see ataints.c); revised numbering |
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** |
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** This file is subject to the terms and conditions of the GNU General Public |
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** License. See the file COPYING in the main directory of this archive |
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** for more details. |
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** |
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*/ |
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#ifndef _LINUX_ATARIINTS_H_ |
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#define _LINUX_ATARIINTS_H_ |
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#include <asm/irq.h> |
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#include <asm/atarihw.h> |
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/* |
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** Atari Interrupt sources. |
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** |
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*/ |
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#define STMFP_SOURCE_BASE 8 |
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#define TTMFP_SOURCE_BASE 24 |
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#define SCC_SOURCE_BASE 40 |
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#define VME_SOURCE_BASE 56 |
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#define VME_MAX_SOURCES 16 |
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#define NUM_ATARI_SOURCES 141 |
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/* convert vector number to int source number */ |
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#define IRQ_VECTOR_TO_SOURCE(v) ((v) - ((v) < 0x20 ? 0x18 : (0x40-8))) |
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/* convert irq_handler index to vector number */ |
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#define IRQ_SOURCE_TO_VECTOR(i) ((i) + ((i) < 8 ? 0x18 : (0x40-8))) |
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/* ST-MFP interrupts */ |
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#define IRQ_MFP_BUSY (8) |
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#define IRQ_MFP_DCD (9) |
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#define IRQ_MFP_CTS (10) |
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#define IRQ_MFP_GPU (11) |
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#define IRQ_MFP_TIMD (12) |
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#define IRQ_MFP_TIMC (13) |
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#define IRQ_MFP_ACIA (14) |
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#define IRQ_MFP_FDC (15) |
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#define IRQ_MFP_ACSI IRQ_MFP_FDC |
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#define IRQ_MFP_FSCSI IRQ_MFP_FDC |
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#define IRQ_MFP_IDE IRQ_MFP_FDC |
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#define IRQ_MFP_TIMB (16) |
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#define IRQ_MFP_SERERR (17) |
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#define IRQ_MFP_SEREMPT (18) |
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#define IRQ_MFP_RECERR (19) |
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#define IRQ_MFP_RECFULL (20) |
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#define IRQ_MFP_TIMA (21) |
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#define IRQ_MFP_RI (22) |
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#define IRQ_MFP_MMD (23) |
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/* TT-MFP interrupts */ |
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#define IRQ_TT_MFP_IO0 (24) |
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#define IRQ_TT_MFP_IO1 (25) |
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#define IRQ_TT_MFP_SCC (26) |
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#define IRQ_TT_MFP_RI (27) |
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#define IRQ_TT_MFP_TIMD (28) |
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#define IRQ_TT_MFP_TIMC (29) |
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#define IRQ_TT_MFP_DRVRDY (30) |
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#define IRQ_TT_MFP_SCSIDMA (31) |
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#define IRQ_TT_MFP_TIMB (32) |
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#define IRQ_TT_MFP_SERERR (33) |
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#define IRQ_TT_MFP_SEREMPT (34) |
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#define IRQ_TT_MFP_RECERR (35) |
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#define IRQ_TT_MFP_RECFULL (36) |
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#define IRQ_TT_MFP_TIMA (37) |
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#define IRQ_TT_MFP_RTC (38) |
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#define IRQ_TT_MFP_SCSI (39) |
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/* SCC interrupts */ |
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#define IRQ_SCCB_TX (40) |
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#define IRQ_SCCB_STAT (42) |
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#define IRQ_SCCB_RX (44) |
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#define IRQ_SCCB_SPCOND (46) |
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#define IRQ_SCCA_TX (48) |
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#define IRQ_SCCA_STAT (50) |
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#define IRQ_SCCA_RX (52) |
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#define IRQ_SCCA_SPCOND (54) |
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/* shared MFP timer D interrupts - hires timer for EtherNEC et al. */ |
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#define IRQ_MFP_TIMER1 (64) |
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#define IRQ_MFP_TIMER2 (65) |
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#define IRQ_MFP_TIMER3 (66) |
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#define IRQ_MFP_TIMER4 (67) |
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#define IRQ_MFP_TIMER5 (68) |
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#define IRQ_MFP_TIMER6 (69) |
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#define IRQ_MFP_TIMER7 (70) |
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#define IRQ_MFP_TIMER8 (71) |
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#define INT_CLK 24576 /* CLK while int_clk =2.456MHz and divide = 100 */ |
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#define INT_TICKS 246 /* to make sched_time = 99.902... HZ */ |
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#define MFP_ENABLE 0 |
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#define MFP_PENDING 1 |
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#define MFP_SERVICE 2 |
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#define MFP_MASK 3 |
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/* Utility functions for setting/clearing bits in the interrupt registers of |
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* the MFP. 'type' should be constant, if 'irq' is constant, too, code size is |
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* reduced. set_mfp_bit() is nonsense for PENDING and SERVICE registers. */ |
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static inline int get_mfp_bit( unsigned irq, int type ) |
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{ unsigned char mask, *reg; |
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mask = 1 << (irq & 7); |
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reg = (unsigned char *)&st_mfp.int_en_a + type*4 + |
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((irq & 8) >> 2) + (((irq-8) & 16) << 3); |
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return( *reg & mask ); |
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} |
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static inline void set_mfp_bit( unsigned irq, int type ) |
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{ unsigned char mask, *reg; |
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mask = 1 << (irq & 7); |
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reg = (unsigned char *)&st_mfp.int_en_a + type*4 + |
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((irq & 8) >> 2) + (((irq-8) & 16) << 3); |
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__asm__ __volatile__ ( "orb %0,%1" |
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: : "di" (mask), "m" (*reg) : "memory" ); |
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} |
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static inline void clear_mfp_bit( unsigned irq, int type ) |
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{ unsigned char mask, *reg; |
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mask = ~(1 << (irq & 7)); |
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reg = (unsigned char *)&st_mfp.int_en_a + type*4 + |
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((irq & 8) >> 2) + (((irq-8) & 16) << 3); |
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if (type == MFP_PENDING || type == MFP_SERVICE) |
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__asm__ __volatile__ ( "moveb %0,%1" |
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: : "di" (mask), "m" (*reg) : "memory" ); |
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else |
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__asm__ __volatile__ ( "andb %0,%1" |
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: : "di" (mask), "m" (*reg) : "memory" ); |
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} |
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/* |
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* {en,dis}able_irq have the usual semantics of temporary blocking the |
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* interrupt, but not losing requests that happen between disabling and |
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* enabling. This is done with the MFP mask registers. |
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*/ |
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static inline void atari_enable_irq( unsigned irq ) |
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{ |
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if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return; |
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set_mfp_bit( irq, MFP_MASK ); |
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} |
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static inline void atari_disable_irq( unsigned irq ) |
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{ |
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if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return; |
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clear_mfp_bit( irq, MFP_MASK ); |
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} |
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/* |
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* In opposite to {en,dis}able_irq, requests between turn{off,on}_irq are not |
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* "stored" |
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*/ |
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static inline void atari_turnon_irq( unsigned irq ) |
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{ |
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if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return; |
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set_mfp_bit( irq, MFP_ENABLE ); |
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} |
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static inline void atari_turnoff_irq( unsigned irq ) |
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{ |
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if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return; |
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clear_mfp_bit( irq, MFP_ENABLE ); |
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clear_mfp_bit( irq, MFP_PENDING ); |
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} |
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static inline void atari_clear_pending_irq( unsigned irq ) |
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{ |
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if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return; |
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clear_mfp_bit( irq, MFP_PENDING ); |
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} |
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static inline int atari_irq_pending( unsigned irq ) |
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{ |
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if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return( 0 ); |
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return( get_mfp_bit( irq, MFP_PENDING ) ); |
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} |
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unsigned int atari_register_vme_int(void); |
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void atari_unregister_vme_int(unsigned int); |
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#endif /* linux/atariints.h */
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