175 lines
4.0 KiB
C
Executable File
175 lines
4.0 KiB
C
Executable File
/*
|
|
* 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);
|
|
}
|