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-rw-r--r--arch/ppc/amiga/amiints.c323
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diff --git a/arch/ppc/amiga/amiints.c b/arch/ppc/amiga/amiints.c
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+/*
+ * arch/ppc/amiga/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 COPYING in the main directory of this archive
+ * for more details.
+ *
+ * 11/07/96: rewritten interrupt handling, irq lists are exists now only for
+ * this sources where it makes sense (VERTB/PORTS/EXTER) and you must
+ * be careful that dev_id for this sources is unique since this the
+ * only possibility to distinguish between different handlers for
+ * free_irq. irq lists also have different irq flags:
+ * - IRQ_FLG_FAST: handler is inserted at top of list (after other
+ * fast handlers)
+ * - IRQ_FLG_SLOW: handler is inserted at bottom of list and before
+ * they're executed irq level is set to the previous
+ * one, but handlers don't need to be reentrant, if
+ * reentrance occurred, slow handlers will be just
+ * called again.
+ * The whole interrupt handling for CIAs is moved to cia.c
+ * /Roman Zippel
+ *
+ * 07/08/99: rewamp of the interrupt handling - we now have two types of
+ * interrupts, normal and fast handlers, fast handlers being
+ * marked with SA_INTERRUPT and runs with all other interrupts
+ * disabled. Normal interrupts disable their own source but
+ * run with all other interrupt sources enabled.
+ * PORTS and EXTER interrupts are always shared even if the
+ * drivers do not explicitly mark this when calling
+ * request_irq which they really should do.
+ * This is similar to the way interrupts are handled on all
+ * other architectures and makes a ton of sense besides
+ * having the advantage of making it easier to share
+ * drivers.
+ * /Jes
+ */
+
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/kernel_stat.h>
+#include <linux/init.h>
+
+#include <asm/system.h>
+#include <asm/irq.h>
+#include <asm/traps.h>
+#include <asm/amigahw.h>
+#include <asm/amigaints.h>
+#include <asm/amipcmcia.h>
+
+#ifdef CONFIG_APUS
+#include <asm/amigappc.h>
+#endif
+
+extern void cia_init_IRQ(struct ciabase *base);
+
+unsigned short ami_intena_vals[AMI_STD_IRQS] = {
+ IF_VERTB, IF_COPER, IF_AUD0, IF_AUD1, IF_AUD2, IF_AUD3, IF_BLIT,
+ IF_DSKSYN, IF_DSKBLK, IF_RBF, IF_TBE, IF_SOFT, IF_PORTS, IF_EXTER
+};
+static const unsigned char ami_servers[AMI_STD_IRQS] = {
+ 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1
+};
+
+static short ami_ablecount[AMI_IRQS];
+
+static void ami_badint(int irq, void *dev_id, struct pt_regs *fp)
+{
+/* num_spurious += 1;*/
+}
+
+/*
+ * void amiga_init_IRQ(void)
+ *
+ * Parameters: None
+ *
+ * Returns: Nothing
+ *
+ * This function should be called during kernel startup to initialize
+ * the amiga IRQ handling routines.
+ */
+
+__init
+void amiga_init_IRQ(void)
+{
+ int i;
+
+ for (i = 0; i < AMI_IRQS; i++)
+ ami_ablecount[i] = 0;
+
+ /* turn off PCMCIA interrupts */
+ if (AMIGAHW_PRESENT(PCMCIA))
+ gayle.inten = GAYLE_IRQ_IDE;
+
+ /* turn off all interrupts... */
+ custom.intena = 0x7fff;
+ custom.intreq = 0x7fff;
+
+#ifdef CONFIG_APUS
+ /* Clear any inter-CPU interrupt requests. Circumvents bug in
+ Blizzard IPL emulation HW (or so it appears). */
+ APUS_WRITE(APUS_INT_LVL, INTLVL_SETRESET | INTLVL_MASK);
+
+ /* Init IPL emulation. */
+ APUS_WRITE(APUS_REG_INT, REGINT_INTMASTER | REGINT_ENABLEIPL);
+ APUS_WRITE(APUS_IPL_EMU, IPLEMU_DISABLEINT);
+ APUS_WRITE(APUS_IPL_EMU, IPLEMU_SETRESET | IPLEMU_IPLMASK);
+#endif
+ /* ... and enable the master interrupt bit */
+ custom.intena = IF_SETCLR | IF_INTEN;
+
+ cia_init_IRQ(&ciaa_base);
+ cia_init_IRQ(&ciab_base);
+}
+
+/*
+ * Enable/disable a particular machine specific interrupt source.
+ * Note that this may affect other interrupts in case of a shared interrupt.
+ * This function should only be called for a _very_ short time to change some
+ * internal data, that may not be changed by the interrupt at the same time.
+ * ami_(enable|disable)_irq calls may also be nested.
+ */
+
+void amiga_enable_irq(unsigned int irq)
+{
+ if (irq >= AMI_IRQS) {
+ printk("%s: Unknown IRQ %d\n", __FUNCTION__, irq);
+ return;
+ }
+
+ ami_ablecount[irq]--;
+ if (ami_ablecount[irq]<0)
+ ami_ablecount[irq]=0;
+ else if (ami_ablecount[irq])
+ return;
+
+ /* No action for auto-vector interrupts */
+ if (irq >= IRQ_AMIGA_AUTO){
+ printk("%s: Trying to enable auto-vector IRQ %i\n",
+ __FUNCTION__, irq - IRQ_AMIGA_AUTO);
+ return;
+ }
+
+ if (irq >= IRQ_AMIGA_CIAA) {
+ cia_set_irq(irq, 0);
+ cia_able_irq(irq, 1);
+ return;
+ }
+
+ /* enable the interrupt */
+ custom.intena = IF_SETCLR | ami_intena_vals[irq];
+}
+
+void amiga_disable_irq(unsigned int irq)
+{
+ if (irq >= AMI_IRQS) {
+ printk("%s: Unknown IRQ %d\n", __FUNCTION__, irq);
+ return;
+ }
+
+ if (ami_ablecount[irq]++)
+ return;
+
+ /* No action for auto-vector interrupts */
+ if (irq >= IRQ_AMIGA_AUTO) {
+ printk("%s: Trying to disable auto-vector IRQ %i\n",
+ __FUNCTION__, irq - IRQ_AMIGA_AUTO);
+ return;
+ }
+
+ if (irq >= IRQ_AMIGA_CIAA) {
+ cia_able_irq(irq, 0);
+ return;
+ }
+
+ /* disable the interrupt */
+ custom.intena = ami_intena_vals[irq];
+}
+
+inline void amiga_do_irq(int irq, struct pt_regs *fp)
+{
+ irq_desc_t *desc = irq_desc + irq;
+ struct irqaction *action = desc->action;
+
+ kstat_cpu(0).irqs[irq]++;
+ action->handler(irq, action->dev_id, fp);
+}
+
+void amiga_do_irq_list(int irq, struct pt_regs *fp)
+{
+ irq_desc_t *desc = irq_desc + irq;
+ struct irqaction *action;
+
+ kstat_cpu(0).irqs[irq]++;
+
+ custom.intreq = ami_intena_vals[irq];
+
+ for (action = desc->action; action; action = action->next)
+ action->handler(irq, action->dev_id, fp);
+}
+
+/*
+ * The builtin Amiga hardware interrupt handlers.
+ */
+
+static void ami_int1(int irq, void *dev_id, struct pt_regs *fp)
+{
+ unsigned short ints = custom.intreqr & custom.intenar;
+
+ /* if serial transmit buffer empty, interrupt */
+ if (ints & IF_TBE) {
+ custom.intreq = IF_TBE;
+ amiga_do_irq(IRQ_AMIGA_TBE, fp);
+ }
+
+ /* if floppy disk transfer complete, interrupt */
+ if (ints & IF_DSKBLK) {
+ custom.intreq = IF_DSKBLK;
+ amiga_do_irq(IRQ_AMIGA_DSKBLK, fp);
+ }
+
+ /* if software interrupt set, interrupt */
+ if (ints & IF_SOFT) {
+ custom.intreq = IF_SOFT;
+ amiga_do_irq(IRQ_AMIGA_SOFT, fp);
+ }
+}
+
+static void ami_int3(int irq, void *dev_id, struct pt_regs *fp)
+{
+ unsigned short ints = custom.intreqr & custom.intenar;
+
+ /* if a blitter interrupt */
+ if (ints & IF_BLIT) {
+ custom.intreq = IF_BLIT;
+ amiga_do_irq(IRQ_AMIGA_BLIT, fp);
+ }
+
+ /* if a copper interrupt */
+ if (ints & IF_COPER) {
+ custom.intreq = IF_COPER;
+ amiga_do_irq(IRQ_AMIGA_COPPER, fp);
+ }
+
+ /* if a vertical blank interrupt */
+ if (ints & IF_VERTB)
+ amiga_do_irq_list(IRQ_AMIGA_VERTB, fp);
+}
+
+static void ami_int4(int irq, void *dev_id, struct pt_regs *fp)
+{
+ unsigned short ints = custom.intreqr & custom.intenar;
+
+ /* if audio 0 interrupt */
+ if (ints & IF_AUD0) {
+ custom.intreq = IF_AUD0;
+ amiga_do_irq(IRQ_AMIGA_AUD0, fp);
+ }
+
+ /* if audio 1 interrupt */
+ if (ints & IF_AUD1) {
+ custom.intreq = IF_AUD1;
+ amiga_do_irq(IRQ_AMIGA_AUD1, fp);
+ }
+
+ /* if audio 2 interrupt */
+ if (ints & IF_AUD2) {
+ custom.intreq = IF_AUD2;
+ amiga_do_irq(IRQ_AMIGA_AUD2, fp);
+ }
+
+ /* if audio 3 interrupt */
+ if (ints & IF_AUD3) {
+ custom.intreq = IF_AUD3;
+ amiga_do_irq(IRQ_AMIGA_AUD3, fp);
+ }
+}
+
+static void ami_int5(int irq, void *dev_id, struct pt_regs *fp)
+{
+ unsigned short ints = custom.intreqr & custom.intenar;
+
+ /* if serial receive buffer full interrupt */
+ if (ints & IF_RBF) {
+ /* acknowledge of IF_RBF must be done by the serial interrupt */
+ amiga_do_irq(IRQ_AMIGA_RBF, fp);
+ }
+
+ /* if a disk sync interrupt */
+ if (ints & IF_DSKSYN) {
+ custom.intreq = IF_DSKSYN;
+ amiga_do_irq(IRQ_AMIGA_DSKSYN, fp);
+ }
+}
+
+static void ami_int7(int irq, void *dev_id, struct pt_regs *fp)
+{
+ panic ("level 7 interrupt received\n");
+}
+
+#ifdef CONFIG_APUS
+/* The PPC irq handling links all handlers requested on the same vector
+ and executes them in a loop. Having ami_badint at the end of the chain
+ is a bad idea. */
+struct irqaction amiga_sys_irqaction[AUTO_IRQS] = {
+ { .handler = ami_badint, .name = "spurious int" },
+ { .handler = ami_int1, .name = "int1 handler" },
+ { 0, /* CIAA */ },
+ { .handler = ami_int3, .name = "int3 handler" },
+ { .handler = ami_int4, .name = "int4 handler" },
+ { .handler = ami_int5, .name = "int5 handler" },
+ { 0, /* CIAB */ },
+ { .handler = ami_int7, .name = "int7 handler" },
+};
+#else
+void (*amiga_default_handler[SYS_IRQS])(int, void *, struct pt_regs *) = {
+ ami_badint, ami_int1, ami_badint, ami_int3,
+ ami_int4, ami_int5, ami_badint, ami_int7
+};
+#endif
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