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/*
* linux/arch/alpha/kernel/sys_jensen.c
*
* Copyright (C) 1995 Linus Torvalds
* Copyright (C) 1998, 1999 Richard Henderson
*
* Code supporting the Jensen.
*/
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/mm.h>
#include <linux/sched.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <asm/ptrace.h>
#include <asm/system.h>
#define __EXTERN_INLINE inline
#include <asm/io.h>
#include <asm/jensen.h>
#undef __EXTERN_INLINE
#include <asm/dma.h>
#include <asm/irq.h>
#include <asm/mmu_context.h>
#include <asm/pgtable.h>
#include "proto.h"
#include "irq_impl.h"
#include "machvec_impl.h"
static void
jensen_update_irq_hw(unsigned long irq, unsigned long mask, int unmask_p)
{
if (irq >= 8)
outb(mask >> 8, 0xA1);
else
outb(mask, 0x21);
}
/*
* Jensen is special: the vector is 0x8X0 for EISA interrupt X, and
* 0x9X0 for the local motherboard interrupts..
*
* 0x660 - NMI
*
* 0x800 - IRQ0 interval timer (not used, as we use the RTC timer)
* 0x810 - IRQ1 line printer (duh..)
* 0x860 - IRQ6 floppy disk
* 0x8E0 - IRQ14 SCSI controller
*
* 0x900 - COM1
* 0x920 - COM2
* 0x980 - keyboard
* 0x990 - mouse
*
* PCI-based systems are more sane: they don't have the local
* interrupts at all, and have only normal PCI interrupts from
* devices. Happily it's easy enough to do a sane mapping from the
* Jensen.. Note that this means that we may have to do a hardware
* "ack" to a different interrupt than we report to the rest of the
* world.
*/
static void
handle_nmi(struct pt_regs * regs)
{
printk("Whee.. NMI received. Probable hardware error\n");
printk("61=%02x, 461=%02x\n", inb(0x61), inb(0x461));
}
static void
jensen_device_interrupt(unsigned long vector, struct pt_regs * regs)
{
int irq, ack;
ack = irq = (vector - 0x800) >> 4;
switch (vector) {
case 0x660: handle_nmi(regs); return;
/* local device interrupts: */
case 0x900: irq = 4, ack = -1; break; /* com1 -> irq 4 */
case 0x920: irq = 3, ack = -1; break; /* com2 -> irq 3 */
case 0x980: irq = 1, ack = -1; break; /* kbd -> irq 1 */
case 0x990: irq = 9, ack = -1; break; /* mouse -> irq 9 */
default:
if (vector > 0x900) {
printk("Unknown local interrupt %lx\n", vector);
}
/* irq1 is supposed to be the keyboard, silly Jensen
(is this really needed??) */
if (irq == 1)
irq = 7;
break;
}
handle_irq(irq, ack, regs);
}
static void
jensen_init_irq(void)
{
STANDARD_INIT_IRQ_PROLOG;
enable_irq(2); /* enable cascade */
}
static void
jensen_machine_check (u64 vector, u64 la, struct pt_regs *regs)
{
printk(KERN_CRIT "Machine check\n");
}
/*
* The System Vector
*/
struct alpha_machine_vector jensen_mv __initmv = {
vector_name: "Jensen",
DO_EV4_MMU,
IO_LITE(JENSEN,jensen),
BUS(jensen),
machine_check: jensen_machine_check,
max_dma_address: ALPHA_MAX_DMA_ADDRESS,
rtc_port: 0x170,
nr_irqs: 16,
irq_probe_mask: _PROBE_MASK(16),
update_irq_hw: jensen_update_irq_hw,
ack_irq: common_ack_irq,
device_interrupt: jensen_device_interrupt,
init_arch: NULL,
init_irq: jensen_init_irq,
init_pit: common_init_pit,
init_pci: NULL,
kill_arch: common_kill_arch,
};
ALIAS_MV(jensen)
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