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Diffstat (limited to 'arch/m68k/include/asm/atariints.h')
| -rw-r--r-- | arch/m68k/include/asm/atariints.h | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/arch/m68k/include/asm/atariints.h b/arch/m68k/include/asm/atariints.h new file mode 100644 index 00000000000..f597892e43a --- /dev/null +++ b/arch/m68k/include/asm/atariints.h @@ -0,0 +1,204 @@ +/* +** atariints.h -- Atari Linux interrupt handling structs and prototypes +** +** Copyright 1994 by Björn Brauel +** +** 5/2/94 Roman Hodek: +** TT interrupt definitions added. +** +** 12/02/96: (Roman) +** Adapted to new int handling scheme (see ataints.c); revised numbering +** +** This file is subject to the terms and conditions of the GNU General Public +** License. See the file COPYING in the main directory of this archive +** for more details. +** +*/ + +#ifndef _LINUX_ATARIINTS_H_ +#define _LINUX_ATARIINTS_H_ + +#include <asm/irq.h> +#include <asm/atarihw.h> + +/* +** Atari Interrupt sources. +** +*/ + +#define STMFP_SOURCE_BASE 8 +#define TTMFP_SOURCE_BASE 24 +#define SCC_SOURCE_BASE 40 +#define VME_SOURCE_BASE 56 +#define VME_MAX_SOURCES 16 + +#define NUM_ATARI_SOURCES (VME_SOURCE_BASE+VME_MAX_SOURCES-STMFP_SOURCE_BASE) + +/* convert vector number to int source number */ +#define IRQ_VECTOR_TO_SOURCE(v) ((v) - ((v) < 0x20 ? 0x18 : (0x40-8))) + +/* convert irq_handler index to vector number */ +#define IRQ_SOURCE_TO_VECTOR(i) ((i) + ((i) < 8 ? 0x18 : (0x40-8))) + +/* interrupt service types */ +#define IRQ_TYPE_SLOW 0 +#define IRQ_TYPE_FAST 1 +#define IRQ_TYPE_PRIO 2 + +/* ST-MFP interrupts */ +#define IRQ_MFP_BUSY (8) +#define IRQ_MFP_DCD (9) +#define IRQ_MFP_CTS (10) +#define IRQ_MFP_GPU (11) +#define IRQ_MFP_TIMD (12) +#define IRQ_MFP_TIMC (13) +#define IRQ_MFP_ACIA (14) +#define IRQ_MFP_FDC (15) +#define IRQ_MFP_ACSI IRQ_MFP_FDC +#define IRQ_MFP_FSCSI IRQ_MFP_FDC +#define IRQ_MFP_IDE IRQ_MFP_FDC +#define IRQ_MFP_TIMB (16) +#define IRQ_MFP_SERERR (17) +#define IRQ_MFP_SEREMPT (18) +#define IRQ_MFP_RECERR (19) +#define IRQ_MFP_RECFULL (20) +#define IRQ_MFP_TIMA (21) +#define IRQ_MFP_RI (22) +#define IRQ_MFP_MMD (23) + +/* TT-MFP interrupts */ +#define IRQ_TT_MFP_IO0 (24) +#define IRQ_TT_MFP_IO1 (25) +#define IRQ_TT_MFP_SCC (26) +#define IRQ_TT_MFP_RI (27) +#define IRQ_TT_MFP_TIMD (28) +#define IRQ_TT_MFP_TIMC (29) +#define IRQ_TT_MFP_DRVRDY (30) +#define IRQ_TT_MFP_SCSIDMA (31) +#define IRQ_TT_MFP_TIMB (32) +#define IRQ_TT_MFP_SERERR (33) +#define IRQ_TT_MFP_SEREMPT (34) +#define IRQ_TT_MFP_RECERR (35) +#define IRQ_TT_MFP_RECFULL (36) +#define IRQ_TT_MFP_TIMA (37) +#define IRQ_TT_MFP_RTC (38) +#define IRQ_TT_MFP_SCSI (39) + +/* SCC interrupts */ +#define IRQ_SCCB_TX (40) +#define IRQ_SCCB_STAT (42) +#define IRQ_SCCB_RX (44) +#define IRQ_SCCB_SPCOND (46) +#define IRQ_SCCA_TX (48) +#define IRQ_SCCA_STAT (50) +#define IRQ_SCCA_RX (52) +#define IRQ_SCCA_SPCOND (54) + + +#define INT_CLK 24576 /* CLK while int_clk =2.456MHz and divide = 100 */ +#define INT_TICKS 246 /* to make sched_time = 99.902... HZ */ + + +#define MFP_ENABLE 0 +#define MFP_PENDING 1 +#define MFP_SERVICE 2 +#define MFP_MASK 3 + +/* Utility functions for setting/clearing bits in the interrupt registers of + * the MFP. 'type' should be constant, if 'irq' is constant, too, code size is + * reduced. set_mfp_bit() is nonsense for PENDING and SERVICE registers. */ + +static inline int get_mfp_bit( unsigned irq, int type ) + +{ unsigned char mask, *reg; + + mask = 1 << (irq & 7); + reg = (unsigned char *)&st_mfp.int_en_a + type*4 + + ((irq & 8) >> 2) + (((irq-8) & 16) << 3); + return( *reg & mask ); +} + +static inline void set_mfp_bit( unsigned irq, int type ) + +{ unsigned char mask, *reg; + + mask = 1 << (irq & 7); + reg = (unsigned char *)&st_mfp.int_en_a + type*4 + + ((irq & 8) >> 2) + (((irq-8) & 16) << 3); + __asm__ __volatile__ ( "orb %0,%1" + : : "di" (mask), "m" (*reg) : "memory" ); +} + +static inline void clear_mfp_bit( unsigned irq, int type ) + +{ unsigned char mask, *reg; + + mask = ~(1 << (irq & 7)); + reg = (unsigned char *)&st_mfp.int_en_a + type*4 + + ((irq & 8) >> 2) + (((irq-8) & 16) << 3); + if (type == MFP_PENDING || type == MFP_SERVICE) + __asm__ __volatile__ ( "moveb %0,%1" + : : "di" (mask), "m" (*reg) : "memory" ); + else + __asm__ __volatile__ ( "andb %0,%1" + : : "di" (mask), "m" (*reg) : "memory" ); +} + +/* + * {en,dis}able_irq have the usual semantics of temporary blocking the + * interrupt, but not loosing requests that happen between disabling and + * enabling. This is done with the MFP mask registers. + */ + +static inline void atari_enable_irq( unsigned irq ) + +{ + if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return; + set_mfp_bit( irq, MFP_MASK ); +} + +static inline void atari_disable_irq( unsigned irq ) + +{ + if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return; + clear_mfp_bit( irq, MFP_MASK ); +} + +/* + * In opposite to {en,dis}able_irq, requests between turn{off,on}_irq are not + * "stored" + */ + +static inline void atari_turnon_irq( unsigned irq ) + +{ + if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return; + set_mfp_bit( irq, MFP_ENABLE ); +} + +static inline void atari_turnoff_irq( unsigned irq ) + +{ + if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return; + clear_mfp_bit( irq, MFP_ENABLE ); + clear_mfp_bit( irq, MFP_PENDING ); +} + +static inline void atari_clear_pending_irq( unsigned irq ) + +{ + if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return; + clear_mfp_bit( irq, MFP_PENDING ); +} + +static inline int atari_irq_pending( unsigned irq ) + +{ + if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return( 0 ); + return( get_mfp_bit( irq, MFP_PENDING ) ); +} + +unsigned long atari_register_vme_int( void ); +void atari_unregister_vme_int( unsigned long ); + +#endif /* linux/atariints.h */ |