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/*

** atariints.h -- Atari Linux interrupt handling structs and prototypes

**

** Copyright 1994 by Bj”rn 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"

 */

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 */