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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"
/*
* 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
jensen_local_ack(unsigned int irq)
{
/* irq1 is supposed to be the keyboard, silly Jensen. */
if (irq == 7)
i8259a_mask_and_ack_irq(1);
}
static struct hw_interrupt_type jensen_local_irq_type = {
typename: "LOCAL",
startup: i8259a_startup_irq,
shutdown: i8259a_disable_irq,
enable: i8259a_enable_irq,
disable: i8259a_disable_irq,
ack: jensen_local_ack,
end: i8259a_enable_irq,
};
static void
jensen_device_interrupt(unsigned long vector, struct pt_regs * regs)
{
int irq;
switch (vector) {
case 0x660:
printk("Whee.. NMI received. Probable hardware error\n");
printk("61=%02x, 461=%02x\n", inb(0x61), inb(0x461));
return;
/* local device interrupts: */
case 0x900: irq = 4; break; /* com1 -> irq 4 */
case 0x920: irq = 3; break; /* com2 -> irq 3 */
case 0x980: irq = 1; break; /* kbd -> irq 1 */
case 0x990: irq = 9; break; /* mouse -> irq 9 */
default:
if (vector > 0x900) {
printk("Unknown local interrupt %lx\n", vector);
return;
}
irq = (vector - 0x800) >> 4;
if (irq == 1)
irq = 7;
break;
}
handle_irq(irq, regs);
}
static void __init
jensen_init_irq(void)
{
init_i8259a_irqs();
init_rtc_irq();
irq_desc[1].handler = &jensen_local_irq_type;
irq_desc[4].handler = &jensen_local_irq_type;
irq_desc[3].handler = &jensen_local_irq_type;
irq_desc[7].handler = &jensen_local_irq_type;
irq_desc[9].handler = &jensen_local_irq_type;
common_init_isa_dma();
}
static void __init
jensen_init_arch(void)
{
__direct_map_base = 0;
__direct_map_size = 0xffffffff;
}
static void
jensen_machine_check (u64 vector, u64 la, struct pt_regs *regs)
{
printk(KERN_CRIT "Machine check\n");
}
#define jensen_pci_tbi ((void*)0)
/*
* 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,
device_interrupt: jensen_device_interrupt,
init_arch: jensen_init_arch,
init_irq: jensen_init_irq,
init_rtc: common_init_rtc,
init_pci: NULL,
kill_arch: NULL,
};
ALIAS_MV(jensen)
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