148 lines
3.7 KiB
C
148 lines
3.7 KiB
C
/*
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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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* Copyright (C) 1992 Linus Torvalds
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* Copyright (C) 1994 - 2001, 2003 Ralf Baechle
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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/kernel.h>
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#include <linux/spinlock.h>
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#include <asm/i8259.h>
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#include <asm/io.h>
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#include <asm/jazz.h>
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static DEFINE_SPINLOCK(r4030_lock);
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static void enable_r4030_irq(unsigned int irq)
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{
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unsigned int mask = 1 << (irq - JAZZ_PARALLEL_IRQ);
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unsigned long flags;
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spin_lock_irqsave(&r4030_lock, flags);
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mask |= r4030_read_reg16(JAZZ_IO_IRQ_ENABLE);
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r4030_write_reg16(JAZZ_IO_IRQ_ENABLE, mask);
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spin_unlock_irqrestore(&r4030_lock, flags);
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}
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void disable_r4030_irq(unsigned int irq)
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{
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unsigned int mask = ~(1 << (irq - JAZZ_PARALLEL_IRQ));
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unsigned long flags;
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spin_lock_irqsave(&r4030_lock, flags);
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mask &= r4030_read_reg16(JAZZ_IO_IRQ_ENABLE);
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r4030_write_reg16(JAZZ_IO_IRQ_ENABLE, mask);
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spin_unlock_irqrestore(&r4030_lock, flags);
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}
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static struct irq_chip r4030_irq_type = {
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.typename = "R4030",
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.ack = disable_r4030_irq,
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.mask = disable_r4030_irq,
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.mask_ack = disable_r4030_irq,
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.unmask = enable_r4030_irq,
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};
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void __init init_r4030_ints(void)
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{
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int i;
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for (i = JAZZ_PARALLEL_IRQ; i <= JAZZ_TIMER_IRQ; i++)
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set_irq_chip_and_handler(i, &r4030_irq_type, handle_level_irq);
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r4030_write_reg16(JAZZ_IO_IRQ_ENABLE, 0);
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r4030_read_reg16(JAZZ_IO_IRQ_SOURCE); /* clear pending IRQs */
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r4030_read_reg32(JAZZ_R4030_INVAL_ADDR); /* clear error bits */
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}
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/*
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* On systems with i8259-style interrupt controllers we assume for
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* driver compatibility reasons interrupts 0 - 15 to be the i8259
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* interrupts even if the hardware uses a different interrupt numbering.
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*/
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void __init arch_init_irq(void)
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{
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init_i8259_irqs(); /* Integrated i8259 */
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init_r4030_ints();
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change_c0_status(ST0_IM, IE_IRQ4 | IE_IRQ3 | IE_IRQ2 | IE_IRQ1);
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}
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static void loc_call(unsigned int irq, unsigned int mask)
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{
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r4030_write_reg16(JAZZ_IO_IRQ_ENABLE,
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r4030_read_reg16(JAZZ_IO_IRQ_ENABLE) & mask);
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do_IRQ(irq);
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r4030_write_reg16(JAZZ_IO_IRQ_ENABLE,
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r4030_read_reg16(JAZZ_IO_IRQ_ENABLE) | mask);
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}
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static void ll_local_dev(void)
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{
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switch (r4030_read_reg32(JAZZ_IO_IRQ_SOURCE)) {
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case 0:
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panic("Unimplemented loc_no_irq handler");
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break;
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case 4:
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loc_call(JAZZ_PARALLEL_IRQ, JAZZ_IE_PARALLEL);
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break;
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case 8:
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loc_call(JAZZ_PARALLEL_IRQ, JAZZ_IE_FLOPPY);
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break;
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case 12:
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panic("Unimplemented loc_sound handler");
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break;
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case 16:
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panic("Unimplemented loc_video handler");
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break;
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case 20:
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loc_call(JAZZ_ETHERNET_IRQ, JAZZ_IE_ETHERNET);
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break;
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case 24:
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loc_call(JAZZ_SCSI_IRQ, JAZZ_IE_SCSI);
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break;
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case 28:
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loc_call(JAZZ_KEYBOARD_IRQ, JAZZ_IE_KEYBOARD);
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break;
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case 32:
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loc_call(JAZZ_MOUSE_IRQ, JAZZ_IE_MOUSE);
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break;
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case 36:
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loc_call(JAZZ_SERIAL1_IRQ, JAZZ_IE_SERIAL1);
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break;
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case 40:
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loc_call(JAZZ_SERIAL2_IRQ, JAZZ_IE_SERIAL2);
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break;
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}
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}
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asmlinkage void plat_irq_dispatch(void)
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{
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unsigned int pending = read_c0_cause() & read_c0_status() & ST0_IM;
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if (pending & IE_IRQ5)
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write_c0_compare(0);
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else if (pending & IE_IRQ4) {
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r4030_read_reg32(JAZZ_TIMER_REGISTER);
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do_IRQ(JAZZ_TIMER_IRQ);
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} else if (pending & IE_IRQ3)
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panic("Unimplemented ISA NMI handler");
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else if (pending & IE_IRQ2)
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do_IRQ(r4030_read_reg32(JAZZ_EISA_IRQ_ACK));
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else if (pending & IE_IRQ1) {
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ll_local_dev();
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} else if (unlikely(pending & IE_IRQ0))
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panic("Unimplemented local_dma handler");
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else if (pending & IE_SW1) {
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clear_c0_cause(IE_SW1);
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panic("Unimplemented sw1 handler");
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} else if (pending & IE_SW0) {
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clear_c0_cause(IE_SW0);
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panic("Unimplemented sw0 handler");
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}
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}
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