175 lines
4 KiB
C
175 lines
4 KiB
C
/*
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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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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/errno.h>
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#include <linux/irq.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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/*
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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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*/
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static void amiga_irq_enable(struct irq_data *data)
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{
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amiga_custom.intena = IF_SETCLR | (1 << (data->irq - IRQ_USER));
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}
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static void amiga_irq_disable(struct irq_data *data)
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{
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amiga_custom.intena = 1 << (data->irq - IRQ_USER);
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}
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static struct irq_chip amiga_irq_chip = {
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.name = "amiga",
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.irq_enable = amiga_irq_enable,
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.irq_disable = amiga_irq_disable,
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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(struct irq_desc *desc)
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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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generic_handle_irq(IRQ_AMIGA_TBE);
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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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generic_handle_irq(IRQ_AMIGA_DSKBLK);
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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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generic_handle_irq(IRQ_AMIGA_SOFT);
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}
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}
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static void ami_int3(struct irq_desc *desc)
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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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generic_handle_irq(IRQ_AMIGA_BLIT);
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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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generic_handle_irq(IRQ_AMIGA_COPPER);
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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_custom.intreq = IF_VERTB;
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generic_handle_irq(IRQ_AMIGA_VERTB);
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}
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}
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static void ami_int4(struct irq_desc *desc)
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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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generic_handle_irq(IRQ_AMIGA_AUD0);
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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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generic_handle_irq(IRQ_AMIGA_AUD1);
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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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generic_handle_irq(IRQ_AMIGA_AUD2);
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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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generic_handle_irq(IRQ_AMIGA_AUD3);
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}
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}
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static void ami_int5(struct irq_desc *desc)
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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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generic_handle_irq(IRQ_AMIGA_RBF);
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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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generic_handle_irq(IRQ_AMIGA_DSKSYN);
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}
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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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void __init amiga_init_IRQ(void)
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{
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m68k_setup_irq_controller(&amiga_irq_chip, handle_simple_irq, IRQ_USER,
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AMI_STD_IRQS);
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irq_set_chained_handler(IRQ_AUTO_1, ami_int1);
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irq_set_chained_handler(IRQ_AUTO_3, ami_int3);
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irq_set_chained_handler(IRQ_AUTO_4, ami_int4);
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irq_set_chained_handler(IRQ_AUTO_5, ami_int5);
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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 and enable the master interrupt bit */
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amiga_custom.intena = 0x7fff;
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amiga_custom.intreq = 0x7fff;
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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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