atariints.h
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- /*
- ** atariints.h -- Atari Linux interrupt handling structs and prototypes
- **
- ** Copyright 1994 by Bj攔n 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
- #define IRQ_SPURIOUS (0)
- /* auto-vector interrupts */
- #define IRQ_AUTO_1 (1)
- #define IRQ_AUTO_2 (2)
- #define IRQ_AUTO_3 (3)
- #define IRQ_AUTO_4 (4)
- #define IRQ_AUTO_5 (5)
- #define IRQ_AUTO_6 (6)
- #define IRQ_AUTO_7 (7)
- /* 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 *)&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 *)&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 *)&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"
- */
- extern inline void atari_turnon_irq( unsigned irq )
- {
- if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return;
- set_mfp_bit( irq, MFP_ENABLE );
- }
- extern 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 );
- }
- extern inline void atari_clear_pending_irq( unsigned irq )
- {
- if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return;
- clear_mfp_bit( irq, MFP_PENDING );
- }
- extern 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 */