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Diffstat (limited to 'arch/ppc/amiga/amiints.c')
-rw-r--r--arch/ppc/amiga/amiints.c322
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diff --git a/arch/ppc/amiga/amiints.c b/arch/ppc/amiga/amiints.c
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--- a/arch/ppc/amiga/amiints.c
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-/*
- * 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/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... */
- amiga_custom.intena = 0x7fff;
- amiga_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 */
- amiga_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 */
- amiga_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 */
- amiga_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]++;
-
- amiga_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 = amiga_custom.intreqr & amiga_custom.intenar;
-
- /* if serial transmit buffer empty, interrupt */
- if (ints & IF_TBE) {
- amiga_custom.intreq = IF_TBE;
- amiga_do_irq(IRQ_AMIGA_TBE, fp);
- }
-
- /* if floppy disk transfer complete, interrupt */
- if (ints & IF_DSKBLK) {
- amiga_custom.intreq = IF_DSKBLK;
- amiga_do_irq(IRQ_AMIGA_DSKBLK, fp);
- }
-
- /* if software interrupt set, interrupt */
- if (ints & IF_SOFT) {
- amiga_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 = amiga_custom.intreqr & amiga_custom.intenar;
-
- /* if a blitter interrupt */
- if (ints & IF_BLIT) {
- amiga_custom.intreq = IF_BLIT;
- amiga_do_irq(IRQ_AMIGA_BLIT, fp);
- }
-
- /* if a copper interrupt */
- if (ints & IF_COPER) {
- amiga_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 = amiga_custom.intreqr & amiga_custom.intenar;
-
- /* if audio 0 interrupt */
- if (ints & IF_AUD0) {
- amiga_custom.intreq = IF_AUD0;
- amiga_do_irq(IRQ_AMIGA_AUD0, fp);
- }
-
- /* if audio 1 interrupt */
- if (ints & IF_AUD1) {
- amiga_custom.intreq = IF_AUD1;
- amiga_do_irq(IRQ_AMIGA_AUD1, fp);
- }
-
- /* if audio 2 interrupt */
- if (ints & IF_AUD2) {
- amiga_custom.intreq = IF_AUD2;
- amiga_do_irq(IRQ_AMIGA_AUD2, fp);
- }
-
- /* if audio 3 interrupt */
- if (ints & IF_AUD3) {
- amiga_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 = amiga_custom.intreqr & amiga_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) {
- amiga_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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