/*
* 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
