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274 lines
6.1 KiB
274 lines
6.1 KiB
/*
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* linux/arch/alpha/kernel/sys_jensen.c
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*
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* Copyright (C) 1995 Linus Torvalds
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* Copyright (C) 1998, 1999 Richard Henderson
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*
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* Code supporting the Jensen.
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*/
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/mm.h>
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#include <linux/sched.h>
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#include <linux/pci.h>
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#include <linux/init.h>
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#include <asm/ptrace.h>
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#include <asm/system.h>
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#define __EXTERN_INLINE inline
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#include <asm/io.h>
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#include <asm/jensen.h>
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#undef __EXTERN_INLINE
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#include <asm/dma.h>
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#include <asm/irq.h>
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#include <asm/mmu_context.h>
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#include <asm/pgtable.h>
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#include <asm/tlbflush.h>
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#include "proto.h"
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#include "irq_impl.h"
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#include "pci_impl.h"
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#include "machvec_impl.h"
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/*
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* Jensen is special: the vector is 0x8X0 for EISA interrupt X, and
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* 0x9X0 for the local motherboard interrupts.
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*
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* Note especially that those local interrupts CANNOT be masked,
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* which causes much of the pain below...
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*
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* 0x660 - NMI
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*
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* 0x800 - IRQ0 interval timer (not used, as we use the RTC timer)
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* 0x810 - IRQ1 line printer (duh..)
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* 0x860 - IRQ6 floppy disk
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*
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* 0x900 - COM1
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* 0x920 - COM2
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* 0x980 - keyboard
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* 0x990 - mouse
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*
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* PCI-based systems are more sane: they don't have the local
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* interrupts at all, and have only normal PCI interrupts from
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* devices. Happily it's easy enough to do a sane mapping from the
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* Jensen.
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*
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* Note that this means that we may have to do a hardware
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* "local_op" to a different interrupt than we report to the rest of the
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* world.
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*/
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static unsigned int
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jensen_local_startup(unsigned int irq)
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{
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/* the parport is really hw IRQ 1, silly Jensen. */
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if (irq == 7)
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i8259a_startup_irq(1);
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else
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/*
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* For all true local interrupts, set the flag that prevents
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* the IPL from being dropped during handler processing.
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*/
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if (irq_desc[irq].action)
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irq_desc[irq].action->flags |= IRQF_DISABLED;
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return 0;
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}
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static void
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jensen_local_shutdown(unsigned int irq)
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{
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/* the parport is really hw IRQ 1, silly Jensen. */
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if (irq == 7)
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i8259a_disable_irq(1);
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}
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static void
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jensen_local_enable(unsigned int irq)
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{
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/* the parport is really hw IRQ 1, silly Jensen. */
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if (irq == 7)
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i8259a_enable_irq(1);
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}
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static void
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jensen_local_disable(unsigned int irq)
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{
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/* the parport is really hw IRQ 1, silly Jensen. */
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if (irq == 7)
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i8259a_disable_irq(1);
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}
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static void
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jensen_local_ack(unsigned int irq)
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{
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/* the parport is really hw IRQ 1, silly Jensen. */
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if (irq == 7)
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i8259a_mask_and_ack_irq(1);
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}
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static void
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jensen_local_end(unsigned int irq)
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{
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/* the parport is really hw IRQ 1, silly Jensen. */
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if (irq == 7)
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i8259a_end_irq(1);
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}
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static struct hw_interrupt_type jensen_local_irq_type = {
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.typename = "LOCAL",
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.startup = jensen_local_startup,
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.shutdown = jensen_local_shutdown,
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.enable = jensen_local_enable,
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.disable = jensen_local_disable,
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.ack = jensen_local_ack,
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.end = jensen_local_end,
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};
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static void
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jensen_device_interrupt(unsigned long vector)
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{
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int irq;
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switch (vector) {
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case 0x660:
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printk("Whee.. NMI received. Probable hardware error\n");
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printk("61=%02x, 461=%02x\n", inb(0x61), inb(0x461));
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return;
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/* local device interrupts: */
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case 0x900: irq = 4; break; /* com1 -> irq 4 */
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case 0x920: irq = 3; break; /* com2 -> irq 3 */
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case 0x980: irq = 1; break; /* kbd -> irq 1 */
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case 0x990: irq = 9; break; /* mouse -> irq 9 */
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default:
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if (vector > 0x900) {
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printk("Unknown local interrupt %lx\n", vector);
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return;
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}
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irq = (vector - 0x800) >> 4;
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if (irq == 1)
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irq = 7;
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break;
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}
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/* If there is no handler yet... */
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if (irq_desc[irq].action == NULL) {
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/* If it is a local interrupt that cannot be masked... */
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if (vector >= 0x900)
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{
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/* Clear keyboard/mouse state */
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inb(0x64);
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inb(0x60);
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/* Reset serial ports */
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inb(0x3fa);
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inb(0x2fa);
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outb(0x0c, 0x3fc);
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outb(0x0c, 0x2fc);
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/* Clear NMI */
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outb(0,0x61);
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outb(0,0x461);
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}
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}
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#if 0
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/* A useful bit of code to find out if an interrupt is going wild. */
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{
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static unsigned int last_msg = 0, last_cc = 0;
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static int last_irq = -1, count = 0;
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unsigned int cc;
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__asm __volatile("rpcc %0" : "=r"(cc));
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++count;
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#define JENSEN_CYCLES_PER_SEC (150000000)
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if (cc - last_msg > ((JENSEN_CYCLES_PER_SEC) * 3) ||
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irq != last_irq) {
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printk(KERN_CRIT " irq %d count %d cc %u @ %lx\n",
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irq, count, cc-last_cc, get_irq_regs()->pc);
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count = 0;
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last_msg = cc;
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last_irq = irq;
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}
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last_cc = cc;
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}
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#endif
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handle_irq(irq);
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}
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static void __init
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jensen_init_irq(void)
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{
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init_i8259a_irqs();
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irq_desc[1].chip = &jensen_local_irq_type;
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irq_desc[4].chip = &jensen_local_irq_type;
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irq_desc[3].chip = &jensen_local_irq_type;
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irq_desc[7].chip = &jensen_local_irq_type;
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irq_desc[9].chip = &jensen_local_irq_type;
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common_init_isa_dma();
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}
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static void __init
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jensen_init_arch(void)
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{
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struct pci_controller *hose;
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#ifdef CONFIG_PCI
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static struct pci_dev fake_isa_bridge = { .dma_mask = 0xffffffffUL, };
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isa_bridge = &fake_isa_bridge;
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#endif
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/* Create a hose so that we can report i/o base addresses to
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userland. */
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pci_isa_hose = hose = alloc_pci_controller();
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hose->io_space = &ioport_resource;
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hose->mem_space = &iomem_resource;
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hose->index = 0;
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hose->sparse_mem_base = EISA_MEM - IDENT_ADDR;
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hose->dense_mem_base = 0;
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hose->sparse_io_base = EISA_IO - IDENT_ADDR;
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hose->dense_io_base = 0;
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hose->sg_isa = hose->sg_pci = NULL;
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__direct_map_base = 0;
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__direct_map_size = 0xffffffff;
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}
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static void
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jensen_machine_check (u64 vector, u64 la)
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{
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printk(KERN_CRIT "Machine check\n");
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}
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/*
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* The System Vector
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*/
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struct alpha_machine_vector jensen_mv __initmv = {
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.vector_name = "Jensen",
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DO_EV4_MMU,
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IO_LITE(JENSEN,jensen),
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.machine_check = jensen_machine_check,
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.max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
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.rtc_port = 0x170,
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.nr_irqs = 16,
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.device_interrupt = jensen_device_interrupt,
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.init_arch = jensen_init_arch,
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.init_irq = jensen_init_irq,
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.init_rtc = common_init_rtc,
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.init_pci = NULL,
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.kill_arch = NULL,
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};
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ALIAS_MV(jensen)
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