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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.
*/
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/errno.h>
#include <linux/irq.h>
#include <asm/irq.h>
#include <asm/traps.h>
#include <asm/amigahw.h>
#include <asm/amigaints.h>
#include <asm/amipcmcia.h>
/*
* 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.
*/
static void amiga_irq_enable(struct irq_data *data)
{
amiga_custom.intena = IF_SETCLR | (1 << (data->irq - IRQ_USER));
}
static void amiga_irq_disable(struct irq_data *data)
{
amiga_custom.intena = 1 << (data->irq - IRQ_USER);
}
static struct irq_chip amiga_irq_chip = {
.name = "amiga",
.irq_enable = amiga_irq_enable,
.irq_disable = amiga_irq_disable,
};
/*
* The builtin Amiga hardware interrupt handlers.
*/
static void ami_int1(struct irq_desc *desc)
{
unsigned short ints = amiga_custom.intreqr & amiga_custom.intenar;
/* if serial transmit buffer empty, interrupt */
if (ints & IF_TBE) {
amiga_custom.intreq = IF_TBE;
generic_handle_irq(IRQ_AMIGA_TBE);
}
/* if floppy disk transfer complete, interrupt */
if (ints & IF_DSKBLK) {
amiga_custom.intreq = IF_DSKBLK;
generic_handle_irq(IRQ_AMIGA_DSKBLK);
}
/* if software interrupt set, interrupt */
if (ints & IF_SOFT) {
amiga_custom.intreq = IF_SOFT;
generic_handle_irq(IRQ_AMIGA_SOFT);
}
}
static void ami_int3(struct irq_desc *desc)
{
unsigned short ints = amiga_custom.intreqr & amiga_custom.intenar;
/* if a blitter interrupt */
if (ints & IF_BLIT) {
amiga_custom.intreq = IF_BLIT;
generic_handle_irq(IRQ_AMIGA_BLIT);
}
/* if a copper interrupt */
if (ints & IF_COPER) {
amiga_custom.intreq = IF_COPER;
generic_handle_irq(IRQ_AMIGA_COPPER);
}
/* if a vertical blank interrupt */
if (ints & IF_VERTB) {
amiga_custom.intreq = IF_VERTB;
generic_handle_irq(IRQ_AMIGA_VERTB);
}
}
static void ami_int4(struct irq_desc *desc)
{
unsigned short ints = amiga_custom.intreqr & amiga_custom.intenar;
/* if audio 0 interrupt */
if (ints & IF_AUD0) {
amiga_custom.intreq = IF_AUD0;
generic_handle_irq(IRQ_AMIGA_AUD0);
}
/* if audio 1 interrupt */
if (ints & IF_AUD1) {
amiga_custom.intreq = IF_AUD1;
generic_handle_irq(IRQ_AMIGA_AUD1);
}
/* if audio 2 interrupt */
if (ints & IF_AUD2) {
amiga_custom.intreq = IF_AUD2;
generic_handle_irq(IRQ_AMIGA_AUD2);
}
/* if audio 3 interrupt */
if (ints & IF_AUD3) {
amiga_custom.intreq = IF_AUD3;
generic_handle_irq(IRQ_AMIGA_AUD3);
}
}
static void ami_int5(struct irq_desc *desc)
{
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 */
generic_handle_irq(IRQ_AMIGA_RBF);
}
/* if a disk sync interrupt */
if (ints & IF_DSKSYN) {
amiga_custom.intreq = IF_DSKSYN;
generic_handle_irq(IRQ_AMIGA_DSKSYN);
}
}
/*
* 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)
{
m68k_setup_irq_controller(&amiga_irq_chip, handle_simple_irq, IRQ_USER,
AMI_STD_IRQS);
irq_set_chained_handler(IRQ_AUTO_1, ami_int1);
irq_set_chained_handler(IRQ_AUTO_3, ami_int3);
irq_set_chained_handler(IRQ_AUTO_4, ami_int4);
irq_set_chained_handler(IRQ_AUTO_5, ami_int5);
/* 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);
}
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