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// 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.
*/
#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>
#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/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)
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