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