patch-1.3.94 linux/arch/m68k/amiga/amiints.c

• Lines: 377
• Date: Wed Mar 20 20:02:50 1996
• Orig file: v1.3.93/linux/arch/m68k/amiga/amiints.c
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v1.3.93/linux/arch/m68k/amiga/amiints.c linux/arch/m68k/amiga/amiints.c
@@ -0,0 +1,376 @@
+/*
+ * amiints.c -- Amiga Linux interrupt handling code
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file README.legal in the main directory of this archive
+ * for more details.
+ *
+ */
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+
+#include <asm/system.h>
+#include <asm/irq.h>
+#include <asm/traps.h>
+#include <asm/amigahw.h>
+#include <asm/amigaints.h>
+
+/* isr node variables for amiga interrupt sources */
+static isr_node_t *ami_lists[NUM_AMIGA_SOURCES];
+
+static const ushort ami_intena_vals[NUM_AMIGA_SOURCES] = {
+    IF_VERTB, IF_COPER, IF_AUD0, IF_AUD1, IF_AUD2, IF_AUD3, IF_BLIT,
+    IF_DSKSYN, IF_DSKBLK, IF_RBF, IF_TBE, IF_PORTS, IF_PORTS, IF_PORTS,
+    IF_PORTS, IF_PORTS, IF_EXTER, IF_EXTER, IF_EXTER, IF_EXTER, IF_EXTER,
+    IF_SOFT, IF_PORTS, IF_EXTER
+    };
+
+struct ciadata
+{
+    volatile struct CIA *ciaptr;
+    unsigned long	baseirq;
+} ciadata[2];
+
+/*
+ * index into ami_lists for IRQs.  CIA IRQs are special, because
+ * the same cia interrupt handler is used for both CIAs.
+ */
+#define IRQ_IDX(source) (source & ~IRQ_MACHSPEC)
+#define CIA_IRQ_IDX(source) (IRQ_IDX(datap->baseirq) \
+			     +(source-IRQ_AMIGA_CIAA_TA))
+
+/*
+ * void amiga_init_INTS (void)
+ *
+ * Parameters:	None
+ *
+ * Returns:	Nothing
+ *
+ * This function should be called during kernel startup to initialize
+ * the amiga IRQ handling routines.
+ */
+
+static void
+    ami_int1(int irq, struct pt_regs *fp, void *data),
+    ami_int2(int irq, struct pt_regs *fp, void *data),
+    ami_int3(int irq, struct pt_regs *fp, void *data),
+    ami_int4(int irq, struct pt_regs *fp, void *data),
+    ami_int5(int irq, struct pt_regs *fp, void *data),
+    ami_int6(int irq, struct pt_regs *fp, void *data),
+    ami_int7(int irq, struct pt_regs *fp, void *data),
+    ami_intcia(int irq, struct pt_regs *fp, void *data);
+
+void amiga_init_INTS (void)
+{
+    int i;
+
+    /* initialize handlers */
+    for (i = 0; i < NUM_AMIGA_SOURCES; i++)
+	ami_lists[i] = NULL;
+
+    add_isr (IRQ1, ami_int1, 0, NULL, "int1 handler");
+    add_isr (IRQ2, ami_int2, 0, NULL, "int2 handler");
+    add_isr (IRQ3, ami_int3, 0, NULL, "int3 handler");
+    add_isr (IRQ4, ami_int4, 0, NULL, "int4 handler");
+    add_isr (IRQ5, ami_int5, 0, NULL, "int5 handler");
+    add_isr (IRQ6, ami_int6, 0, NULL, "int6 handler");
+    add_isr (IRQ7, ami_int7, 0, NULL, "int7 handler");
+
+    /* hook in the CIA interrupts */
+    ciadata[0].ciaptr = &ciaa;
+    ciadata[0].baseirq = IRQ_AMIGA_CIAA_TA;
+    add_isr (IRQ_AMIGA_PORTS, ami_intcia, 0, NULL, "Amiga CIAA");
+    ciadata[1].ciaptr = &ciab;
+    ciadata[1].baseirq = IRQ_AMIGA_CIAB_TA;
+    add_isr (IRQ_AMIGA_EXTER, ami_intcia, 0, NULL, "Amiga CIAB");
+
+    /* turn off all interrupts and enable the master interrupt bit */
+    custom.intena = 0x7fff;
+    custom.intreq = 0x7fff;
+    custom.intena = 0xc000;
+
+    /* turn off all CIA interrupts */
+    ciaa.icr = 0x7f;
+    ciab.icr = 0x7f;
+
+    /* clear any pending CIA interrupts */
+    i = ciaa.icr;
+    i = ciab.icr;
+}
+
+
+/*
+ * The builtin Amiga hardware interrupt handlers.
+ */
+
+static void ami_int1 (int irq, struct pt_regs *fp, void *data)
+{
+    ushort ints = custom.intreqr & custom.intenar;
+
+    /* if serial transmit buffer empty, interrupt */
+    if (ints & IF_TBE) {
+	if (ami_lists[IRQ_IDX(IRQ_AMIGA_TBE)]) {
+	    call_isr_list (IRQ_AMIGA_TBE,
+			   ami_lists[IRQ_IDX(IRQ_AMIGA_TBE)], fp);
+	    /* 
+	     * don't acknowledge.... 
+	     * allow serial code to turn off interrupts, but
+	     * leave it pending so that when interrupts are
+	     * turned on, transmission will resume
+	     */
+	} else
+	    /* acknowledge the interrupt */
+	    custom.intreq = IF_TBE;
+    }
+
+    /* if floppy disk transfer complete, interrupt */
+    if (ints & IF_DSKBLK) {
+	call_isr_list (IRQ_AMIGA_DSKBLK,
+		       ami_lists[IRQ_IDX(IRQ_AMIGA_DSKBLK)], fp);
+
+	/* acknowledge */
+	custom.intreq = IF_DSKBLK;
+    }
+
+    /* if software interrupt set, interrupt */
+    if (ints & IF_SOFT) {
+	call_isr_list (IRQ_AMIGA_SOFT,
+		       ami_lists[IRQ_IDX(IRQ_AMIGA_SOFT)], fp);
+
+	/* acknowledge */
+	custom.intreq = IF_SOFT;
+    }
+}
+
+static void ami_int2 (int irq, struct pt_regs *fp, void *data)
+{
+    ushort ints = custom.intreqr & custom.intenar;
+
+    if (ints & IF_PORTS) {
+	/* call routines which have hooked into the PORTS interrupt */
+	call_isr_list (IRQ_AMIGA_PORTS,
+		       ami_lists[IRQ_IDX(IRQ_AMIGA_PORTS)], fp);
+
+	/* acknowledge */
+	custom.intreq = IF_PORTS;
+    }
+}
+
+static void ami_int3 (int irq, struct pt_regs *fp, void *data)
+{
+    ushort ints = custom.intreqr & custom.intenar;
+
+    /* if a copper interrupt */
+    if (ints & IF_COPER) {
+	call_isr_list (IRQ_AMIGA_COPPER,
+		       ami_lists[IRQ_IDX(IRQ_AMIGA_COPPER)], fp);
+
+	/* acknowledge */
+	custom.intreq = IF_COPER;
+    }
+
+    /* if a vertical blank interrupt */
+    if (ints & IF_VERTB) {
+	call_isr_list (IRQ_AMIGA_VERTB,
+		       ami_lists[IRQ_IDX(IRQ_AMIGA_VERTB)], fp);
+
+	/* acknowledge */
+	custom.intreq = IF_VERTB;
+    }
+
+    /* if a blitter interrupt */
+    if (ints & IF_BLIT) {
+	call_isr_list (IRQ_AMIGA_BLIT,
+		       ami_lists[IRQ_IDX(IRQ_AMIGA_BLIT)], fp);
+
+	/* acknowledge */
+	custom.intreq = IF_BLIT;
+    }
+}
+
+static void ami_int4 (int irq, struct pt_regs *fp, void *data)
+{
+    ushort ints = custom.intreqr & custom.intenar;
+
+    /* if audio 0 interrupt */
+    if (ints & IF_AUD0) {
+	call_isr_list (IRQ_AMIGA_AUD0,
+		       ami_lists[IRQ_IDX(IRQ_AMIGA_AUD0)], fp);
+
+	/* acknowledge */
+	custom.intreq = IF_AUD0;
+    }
+
+    /* if audio 1 interrupt */
+    if (ints & IF_AUD1) {
+	call_isr_list (IRQ_AMIGA_AUD1,
+		       ami_lists[IRQ_IDX(IRQ_AMIGA_AUD1)], fp);
+
+	/* acknowledge */
+	custom.intreq = IF_AUD1;
+    }
+
+    /* if audio 2 interrupt */
+    if (ints & IF_AUD2) {
+	call_isr_list (IRQ_AMIGA_AUD2,
+		       ami_lists[IRQ_IDX(IRQ_AMIGA_AUD2)], fp);
+
+	/* acknowledge */
+	custom.intreq = IF_AUD2;
+    }
+
+    /* if audio 3 interrupt */
+    if (ints & IF_AUD3) {
+	call_isr_list (IRQ_AMIGA_AUD3,
+		       ami_lists[IRQ_IDX(IRQ_AMIGA_AUD3)], fp);
+
+	/* acknowledge */
+	custom.intreq = IF_AUD3;
+    }
+}
+
+static void ami_int5 (int irq, struct pt_regs *fp, void *data)
+{
+    ushort ints = custom.intreqr & custom.intenar;
+
+    /* if serial receive buffer full interrupt */
+    if (ints & IF_RBF) {
+	if (ami_lists[IRQ_IDX(IRQ_AMIGA_RBF)]) {
+	    call_isr_list (IRQ_AMIGA_RBF,
+			   ami_lists[IRQ_IDX(IRQ_AMIGA_RBF)], fp);
+	    /* don't acknowledge ; leave that for the handler */
+        } else
+	    /* acknowledge the interrupt */
+	    custom.intreq = IF_RBF;
+    }
+
+    /* if a disk sync interrupt */
+    if (ints & IF_DSKSYN) {
+	call_isr_list (IRQ_AMIGA_DSKSYN,
+		       ami_lists[IRQ_IDX(IRQ_AMIGA_DSKSYN)], fp);
+
+	/* acknowledge */
+	custom.intreq = IF_DSKSYN;
+    }
+}
+
+static void ami_int6 (int irq, struct pt_regs *fp, void *data)
+{
+    ushort ints = custom.intreqr & custom.intenar;
+
+    if (ints & IF_EXTER) {
+	/* call routines which have hooked into the EXTER interrupt */
+	call_isr_list (IRQ_AMIGA_EXTER,
+		       ami_lists[IRQ_IDX(IRQ_AMIGA_EXTER)], fp);
+
+	/* acknowledge */
+	custom.intreq = IF_EXTER;
+    }
+}
+
+static void ami_int7 (int irq, struct pt_regs *fp, void *data)
+{
+    panic ("level 7 interrupt received\n");
+}
+
+static void ami_intcia (int irq, struct pt_regs *fp, void *data)
+{
+    /* check CIA interrupts */
+    struct ciadata *datap;
+    u_char cia_ints;
+
+    /* setup data correctly */
+    if (irq == IRQ_AMIGA_PORTS)
+	    datap = &ciadata[0];
+    else
+	    datap = &ciadata[1];
+
+    cia_ints = datap->ciaptr->icr;
+
+    /* if timer A interrupt */
+    if (cia_ints & CIA_ICR_TA)
+	call_isr_list (IRQ_AMIGA_CIAA_TA,
+		       ami_lists[CIA_IRQ_IDX(IRQ_AMIGA_CIAA_TA)], fp);
+
+    /* if timer B interrupt */
+    if (cia_ints & CIA_ICR_TB)
+	call_isr_list (IRQ_AMIGA_CIAA_TB,
+		       ami_lists[CIA_IRQ_IDX(IRQ_AMIGA_CIAA_TB)], fp);
+
+    /* if the alarm interrupt */
+    if (cia_ints & CIA_ICR_ALRM)
+	call_isr_list (IRQ_AMIGA_CIAA_ALRM,
+		       ami_lists[CIA_IRQ_IDX(IRQ_AMIGA_CIAA_ALRM)], fp);
+
+    /* if serial port interrupt (keyboard) */
+    if (cia_ints & CIA_ICR_SP)
+	call_isr_list (IRQ_AMIGA_CIAA_SP,
+		       ami_lists[CIA_IRQ_IDX(IRQ_AMIGA_CIAA_SP)], fp);
+
+    /* if flag interrupt (parallel port) */
+    if (cia_ints & CIA_ICR_FLG)
+	call_isr_list (IRQ_AMIGA_CIAA_FLG,
+		       ami_lists[CIA_IRQ_IDX(IRQ_AMIGA_CIAA_FLG)], fp);
+}
+
+/*
+ * amiga_add_isr : add an interrupt service routine for a particular
+ *		   machine specific interrupt source.
+ *		   If the addition was successful, it returns 1, otherwise
+ *		   it returns 0.  It will fail if another routine is already
+ *		   bound into the specified source.
+ *   Note that the "pri" argument is currently unused.
+ */
+
+int amiga_add_isr (unsigned long source, isrfunc isr, int pri, void
+		   *data, char *name)
+{
+    unsigned long amiga_source = source & ~IRQ_MACHSPEC;
+    isr_node_t *p;
+
+    if (amiga_source > NUM_AMIGA_SOURCES) {
+	printk ("amiga_add_isr: Unknown interrupt source %ld\n", source);
+	return 0;
+    }
+
+    p = new_isr_node();
+    p->isr = isr;
+    p->pri = pri;
+    p->data = data;
+    p->name = name;
+    p->next = NULL;
+    insert_isr (&ami_lists[amiga_source], p);
+
+    /* enable the interrupt */
+    custom.intena = IF_SETCLR | ami_intena_vals[amiga_source];
+
+    /* if a CIAA interrupt, enable the appropriate CIA ICR bit */
+    if (source >= IRQ_AMIGA_CIAA_TA && source <= IRQ_AMIGA_CIAA_FLG)
+	ciaa.icr = 0x80 | (1 << (source - IRQ_AMIGA_CIAA_TA));
+
+    /* if a CIAB interrupt, enable the appropriate CIA ICR bit */
+    if (source >= IRQ_AMIGA_CIAB_TA && source <= IRQ_AMIGA_CIAB_FLG)
+	ciab.icr = 0x80 | (1 << (source - IRQ_AMIGA_CIAB_TA));
+
+    return 1;
+}
+
+int amiga_get_irq_list( char *buf, int len )
+{	int			i;
+    isr_node_t	*p;
+
+	for( i = 0; i < NUM_AMIGA_SOURCES; ++i ) {
+		if (!ami_lists[i])
+			continue;
+		len += sprintf( buf+len, "ami  %2d: ???????? ", i );
+		for( p = ami_lists[i]; p; p = p->next ) {
+			len += sprintf( buf+len, "%s\n", p->name );
+			if (p->next)
+				len += sprintf( buf+len, "                  " );
+		}
+	}
+	
+	return( len );
+}