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linux-sg2042/arch/m68k/amiga/amiints.c

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/*
* linux/arch/m68k/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/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/kernel_stat.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/seq_file.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>
extern int cia_request_irq(struct ciabase *base,int irq,
irqreturn_t (*handler)(int, void *, struct pt_regs *),
unsigned long flags, const char *devname, void *dev_id);
extern void cia_free_irq(struct ciabase *base, unsigned int irq, void *dev_id);
extern void cia_init_IRQ(struct ciabase *base);
extern int cia_get_irq_list(struct ciabase *base, struct seq_file *p);
/* irq node variables for amiga interrupt sources */
static irq_node_t *ami_irq_list[AMI_STD_IRQS];
static unsigned short amiga_intena_vals[AMI_STD_IRQS] = {
[IRQ_AMIGA_VERTB] = IF_VERTB,
[IRQ_AMIGA_COPPER] = IF_COPER,
[IRQ_AMIGA_AUD0] = IF_AUD0,
[IRQ_AMIGA_AUD1] = IF_AUD1,
[IRQ_AMIGA_AUD2] = IF_AUD2,
[IRQ_AMIGA_AUD3] = IF_AUD3,
[IRQ_AMIGA_BLIT] = IF_BLIT,
[IRQ_AMIGA_DSKSYN] = IF_DSKSYN,
[IRQ_AMIGA_DSKBLK] = IF_DSKBLK,
[IRQ_AMIGA_RBF] = IF_RBF,
[IRQ_AMIGA_TBE] = IF_TBE,
[IRQ_AMIGA_SOFT] = IF_SOFT,
[IRQ_AMIGA_PORTS] = IF_PORTS,
[IRQ_AMIGA_EXTER] = IF_EXTER
};
static const unsigned char ami_servers[AMI_STD_IRQS] = {
[IRQ_AMIGA_VERTB] = 1,
[IRQ_AMIGA_PORTS] = 1,
[IRQ_AMIGA_EXTER] = 1
};
static short ami_ablecount[AMI_IRQS];
static irqreturn_t ami_badint(int irq, void *dev_id, struct pt_regs *fp)
{
num_spurious += 1;
return IRQ_NONE;
}
/*
* void amiga_init_IRQ(void)
*
* Parameters: None
*
* Returns: Nothing
*
* This function should be called during kernel startup to initialize
* the amiga IRQ handling routines.
*/
void __init amiga_init_IRQ(void)
{
int i;
/* initialize handlers */
for (i = 0; i < AMI_STD_IRQS; i++) {
if (ami_servers[i]) {
ami_irq_list[i] = NULL;
} else {
ami_irq_list[i] = new_irq_node();
ami_irq_list[i]->handler = ami_badint;
ami_irq_list[i]->flags = 0;
ami_irq_list[i]->dev_id = NULL;
ami_irq_list[i]->devname = NULL;
ami_irq_list[i]->next = NULL;
}
}
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 and enable the master interrupt bit */
amiga_custom.intena = 0x7fff;
amiga_custom.intreq = 0x7fff;
amiga_custom.intena = IF_SETCLR | IF_INTEN;
cia_init_IRQ(&ciaa_base);
cia_init_IRQ(&ciab_base);
}
static inline int amiga_insert_irq(irq_node_t **list, irq_node_t *node)
{
unsigned long flags;
irq_node_t *cur;
if (!node->dev_id)
printk("%s: Warning: dev_id of %s is zero\n",
__FUNCTION__, node->devname);
local_irq_save(flags);
cur = *list;
if (node->flags & SA_INTERRUPT) {
if (node->flags & SA_SHIRQ)
return -EBUSY;
/*
* There should never be more than one
*/
while (cur && cur->flags & SA_INTERRUPT) {
list = &cur->next;
cur = cur->next;
}
} else {
while (cur) {
list = &cur->next;
cur = cur->next;
}
}
node->next = cur;
*list = node;
local_irq_restore(flags);
return 0;
}
static inline void amiga_delete_irq(irq_node_t **list, void *dev_id)
{
unsigned long flags;
irq_node_t *node;
local_irq_save(flags);
for (node = *list; node; list = &node->next, node = *list) {
if (node->dev_id == dev_id) {
*list = node->next;
/* Mark it as free. */
node->handler = NULL;
local_irq_restore(flags);
return;
}
}
local_irq_restore(flags);
printk ("%s: tried to remove invalid irq\n", __FUNCTION__);
}
/*
* amiga_request_irq : add an interrupt service routine for a particular
* machine specific interrupt source.
* If the addition was successful, it returns 0.
*/
int amiga_request_irq(unsigned int irq,
irqreturn_t (*handler)(int, void *, struct pt_regs *),
unsigned long flags, const char *devname, void *dev_id)
{
irq_node_t *node;
int error = 0;
if (irq >= AMI_IRQS) {
printk ("%s: Unknown IRQ %d from %s\n", __FUNCTION__,
irq, devname);
return -ENXIO;
}
if (irq >= IRQ_AMIGA_AUTO)
return cpu_request_irq(irq - IRQ_AMIGA_AUTO, handler,
flags, devname, dev_id);
if (irq >= IRQ_AMIGA_CIAB)
return cia_request_irq(&ciab_base, irq - IRQ_AMIGA_CIAB,
handler, flags, devname, dev_id);
if (irq >= IRQ_AMIGA_CIAA)
return cia_request_irq(&ciaa_base, irq - IRQ_AMIGA_CIAA,
handler, flags, devname, dev_id);
/*
* IRQ_AMIGA_PORTS & IRQ_AMIGA_EXTER defaults to shared,
* we could add a check here for the SA_SHIRQ flag but all drivers
* should be aware of sharing anyway.
*/
if (ami_servers[irq]) {
if (!(node = new_irq_node()))
return -ENOMEM;
node->handler = handler;
node->flags = flags;
node->dev_id = dev_id;
node->devname = devname;
node->next = NULL;
error = amiga_insert_irq(&ami_irq_list[irq], node);
} else {
ami_irq_list[irq]->handler = handler;
ami_irq_list[irq]->flags = flags;
ami_irq_list[irq]->dev_id = dev_id;
ami_irq_list[irq]->devname = devname;
}
/* enable the interrupt */
if (irq < IRQ_AMIGA_PORTS && !ami_ablecount[irq])
amiga_custom.intena = IF_SETCLR | amiga_intena_vals[irq];
return error;
}
void amiga_free_irq(unsigned int irq, void *dev_id)
{
if (irq >= AMI_IRQS) {
printk ("%s: Unknown IRQ %d\n", __FUNCTION__, irq);
return;
}
if (irq >= IRQ_AMIGA_AUTO)
cpu_free_irq(irq - IRQ_AMIGA_AUTO, dev_id);
if (irq >= IRQ_AMIGA_CIAB) {
cia_free_irq(&ciab_base, irq - IRQ_AMIGA_CIAB, dev_id);
return;
}
if (irq >= IRQ_AMIGA_CIAA) {
cia_free_irq(&ciaa_base, irq - IRQ_AMIGA_CIAA, dev_id);
return;
}
if (ami_servers[irq]) {
amiga_delete_irq(&ami_irq_list[irq], dev_id);
/* if server list empty, disable the interrupt */
if (!ami_irq_list[irq] && irq < IRQ_AMIGA_PORTS)
amiga_custom.intena = amiga_intena_vals[irq];
} else {
if (ami_irq_list[irq]->dev_id != dev_id)
printk("%s: removing probably wrong IRQ %d from %s\n",
__FUNCTION__, irq, ami_irq_list[irq]->devname);
ami_irq_list[irq]->handler = ami_badint;
ami_irq_list[irq]->flags = 0;
ami_irq_list[irq]->dev_id = NULL;
ami_irq_list[irq]->devname = NULL;
amiga_custom.intena = amiga_intena_vals[irq];
}
}
/*
* 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;
}
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_CIAB) {
cia_set_irq(&ciab_base, (1 << (irq - IRQ_AMIGA_CIAB)));
cia_able_irq(&ciab_base, CIA_ICR_SETCLR |
(1 << (irq - IRQ_AMIGA_CIAB)));
return;
}
if (irq >= IRQ_AMIGA_CIAA) {
cia_set_irq(&ciaa_base, (1 << (irq - IRQ_AMIGA_CIAA)));
cia_able_irq(&ciaa_base, CIA_ICR_SETCLR |
(1 << (irq - IRQ_AMIGA_CIAA)));
return;
}
/* enable the interrupt */
amiga_custom.intena = IF_SETCLR | amiga_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_CIAB) {
cia_able_irq(&ciab_base, 1 << (irq - IRQ_AMIGA_CIAB));
return;
}
if (irq >= IRQ_AMIGA_CIAA) {
cia_able_irq(&ciaa_base, 1 << (irq - IRQ_AMIGA_CIAA));
return;
}
/* disable the interrupt */
amiga_custom.intena = amiga_intena_vals[irq];
}
inline void amiga_do_irq(int irq, struct pt_regs *fp)
{
kstat_cpu(0).irqs[SYS_IRQS + irq]++;
ami_irq_list[irq]->handler(irq, ami_irq_list[irq]->dev_id, fp);
}
void amiga_do_irq_list(int irq, struct pt_regs *fp)
{
irq_node_t *node;
kstat_cpu(0).irqs[SYS_IRQS + irq]++;
amiga_custom.intreq = amiga_intena_vals[irq];
for (node = ami_irq_list[irq]; node; node = node->next)
node->handler(irq, node->dev_id, fp);
}
/*
* The builtin Amiga hardware interrupt handlers.
*/
static irqreturn_t 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);
}
return IRQ_HANDLED;
}
static irqreturn_t 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);
return IRQ_HANDLED;
}
static irqreturn_t 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);
}
return IRQ_HANDLED;
}
static irqreturn_t 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);
}
return IRQ_HANDLED;
}
static irqreturn_t ami_int7(int irq, void *dev_id, struct pt_regs *fp)
{
panic ("level 7 interrupt received\n");
}
irqreturn_t (*amiga_default_handler[SYS_IRQS])(int, void *, struct pt_regs *) = {
[0] = ami_badint,
[1] = ami_int1,
[2] = ami_badint,
[3] = ami_int3,
[4] = ami_int4,
[5] = ami_int5,
[6] = ami_badint,
[7] = ami_int7
};
int show_amiga_interrupts(struct seq_file *p, void *v)
{
int i;
irq_node_t *node;
for (i = 0; i < AMI_STD_IRQS; i++) {
if (!(node = ami_irq_list[i]))
continue;
seq_printf(p, "ami %2d: %10u ", i,
kstat_cpu(0).irqs[SYS_IRQS + i]);
do {
if (node->flags & SA_INTERRUPT)
seq_puts(p, "F ");
else
seq_puts(p, " ");
seq_printf(p, "%s\n", node->devname);
if ((node = node->next))
seq_puts(p, " ");
} while (node);
}
cia_get_irq_list(&ciaa_base, p);
cia_get_irq_list(&ciab_base, p);
return 0;
}
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