238 lines
5.5 KiB
C
238 lines
5.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* linux/arch/alpha/kernel/sys_jensen.c
|
|
*
|
|
* Copyright (C) 1995 Linus Torvalds
|
|
* Copyright (C) 1998, 1999 Richard Henderson
|
|
*
|
|
* Code supporting the Jensen.
|
|
*/
|
|
#define __EXTERN_INLINE
|
|
#include <asm/io.h>
|
|
#include <asm/jensen.h>
|
|
#undef __EXTERN_INLINE
|
|
|
|
#include <linux/interrupt.h>
|
|
#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/dma.h>
|
|
#include <asm/irq.h>
|
|
#include <asm/mmu_context.h>
|
|
#include <asm/tlbflush.h>
|
|
|
|
#include "proto.h"
|
|
#include "irq_impl.h"
|
|
#include "pci_impl.h"
|
|
#include "machvec_impl.h"
|
|
|
|
|
|
/*
|
|
* Jensen is special: the vector is 0x8X0 for EISA interrupt X, and
|
|
* 0x9X0 for the local motherboard interrupts.
|
|
*
|
|
* Note especially that those local interrupts CANNOT be masked,
|
|
* which causes much of the pain below...
|
|
*
|
|
* 0x660 - NMI
|
|
*
|
|
* 0x800 - IRQ0 interval timer (not used, as we use the RTC timer)
|
|
* 0x810 - IRQ1 line printer (duh..)
|
|
* 0x860 - IRQ6 floppy disk
|
|
*
|
|
* 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
|
|
* "local_op" to a different interrupt than we report to the rest of the
|
|
* world.
|
|
*/
|
|
|
|
static void
|
|
jensen_local_enable(struct irq_data *d)
|
|
{
|
|
/* the parport is really hw IRQ 1, silly Jensen. */
|
|
if (d->irq == 7)
|
|
i8259a_enable_irq(d);
|
|
}
|
|
|
|
static void
|
|
jensen_local_disable(struct irq_data *d)
|
|
{
|
|
/* the parport is really hw IRQ 1, silly Jensen. */
|
|
if (d->irq == 7)
|
|
i8259a_disable_irq(d);
|
|
}
|
|
|
|
static void
|
|
jensen_local_mask_ack(struct irq_data *d)
|
|
{
|
|
/* the parport is really hw IRQ 1, silly Jensen. */
|
|
if (d->irq == 7)
|
|
i8259a_mask_and_ack_irq(d);
|
|
}
|
|
|
|
static struct irq_chip jensen_local_irq_type = {
|
|
.name = "LOCAL",
|
|
.irq_unmask = jensen_local_enable,
|
|
.irq_mask = jensen_local_disable,
|
|
.irq_mask_ack = jensen_local_mask_ack,
|
|
};
|
|
|
|
static void
|
|
jensen_device_interrupt(unsigned long vector)
|
|
{
|
|
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;
|
|
}
|
|
|
|
/* If there is no handler yet... */
|
|
if (!irq_has_action(irq)) {
|
|
/* If it is a local interrupt that cannot be masked... */
|
|
if (vector >= 0x900)
|
|
{
|
|
/* Clear keyboard/mouse state */
|
|
inb(0x64);
|
|
inb(0x60);
|
|
/* Reset serial ports */
|
|
inb(0x3fa);
|
|
inb(0x2fa);
|
|
outb(0x0c, 0x3fc);
|
|
outb(0x0c, 0x2fc);
|
|
/* Clear NMI */
|
|
outb(0,0x61);
|
|
outb(0,0x461);
|
|
}
|
|
}
|
|
|
|
#if 0
|
|
/* A useful bit of code to find out if an interrupt is going wild. */
|
|
{
|
|
static unsigned int last_msg = 0, last_cc = 0;
|
|
static int last_irq = -1, count = 0;
|
|
unsigned int cc;
|
|
|
|
__asm __volatile("rpcc %0" : "=r"(cc));
|
|
++count;
|
|
#define JENSEN_CYCLES_PER_SEC (150000000)
|
|
if (cc - last_msg > ((JENSEN_CYCLES_PER_SEC) * 3) ||
|
|
irq != last_irq) {
|
|
printk(KERN_CRIT " irq %d count %d cc %u @ %lx\n",
|
|
irq, count, cc-last_cc, get_irq_regs()->pc);
|
|
count = 0;
|
|
last_msg = cc;
|
|
last_irq = irq;
|
|
}
|
|
last_cc = cc;
|
|
}
|
|
#endif
|
|
|
|
handle_irq(irq);
|
|
}
|
|
|
|
static void __init
|
|
jensen_init_irq(void)
|
|
{
|
|
init_i8259a_irqs();
|
|
|
|
irq_set_chip_and_handler(1, &jensen_local_irq_type, handle_level_irq);
|
|
irq_set_chip_and_handler(4, &jensen_local_irq_type, handle_level_irq);
|
|
irq_set_chip_and_handler(3, &jensen_local_irq_type, handle_level_irq);
|
|
irq_set_chip_and_handler(7, &jensen_local_irq_type, handle_level_irq);
|
|
irq_set_chip_and_handler(9, &jensen_local_irq_type, handle_level_irq);
|
|
|
|
common_init_isa_dma();
|
|
}
|
|
|
|
static void __init
|
|
jensen_init_arch(void)
|
|
{
|
|
struct pci_controller *hose;
|
|
#ifdef CONFIG_PCI
|
|
static struct pci_dev fake_isa_bridge = { .dma_mask = 0xffffffffUL, };
|
|
|
|
isa_bridge = &fake_isa_bridge;
|
|
#endif
|
|
|
|
/* Create a hose so that we can report i/o base addresses to
|
|
userland. */
|
|
|
|
pci_isa_hose = hose = alloc_pci_controller();
|
|
hose->io_space = &ioport_resource;
|
|
hose->mem_space = &iomem_resource;
|
|
hose->index = 0;
|
|
|
|
hose->sparse_mem_base = EISA_MEM - IDENT_ADDR;
|
|
hose->dense_mem_base = 0;
|
|
hose->sparse_io_base = EISA_IO - IDENT_ADDR;
|
|
hose->dense_io_base = 0;
|
|
|
|
hose->sg_isa = hose->sg_pci = NULL;
|
|
__direct_map_base = 0;
|
|
__direct_map_size = 0xffffffff;
|
|
}
|
|
|
|
static void
|
|
jensen_machine_check(unsigned long vector, unsigned long la)
|
|
{
|
|
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),
|
|
.machine_check = jensen_machine_check,
|
|
.max_isa_dma_address = ALPHA_MAX_ISA_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)
|