2005-04-16 22:20:36 +00:00
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/*
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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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2006-07-02 02:29:11 +00:00
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irq_desc[irq].action->flags |= IRQF_DISABLED;
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2005-04-16 22:20:36 +00:00
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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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2006-10-08 13:36:08 +00:00
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jensen_device_interrupt(unsigned long vector)
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2005-04-16 22:20:36 +00:00
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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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2006-10-08 13:36:08 +00:00
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irq, count, cc-last_cc, get_irq_regs()->pc);
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2005-04-16 22:20:36 +00:00
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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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2006-10-08 13:37:32 +00:00
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handle_irq(irq);
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2005-04-16 22:20:36 +00:00
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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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[PATCH] genirq: rename desc->handler to desc->chip
This patch-queue improves the generic IRQ layer to be truly generic, by adding
various abstractions and features to it, without impacting existing
functionality.
While the queue can be best described as "fix and improve everything in the
generic IRQ layer that we could think of", and thus it consists of many
smaller features and lots of cleanups, the one feature that stands out most is
the new 'irq chip' abstraction.
The irq-chip abstraction is about describing and coding and IRQ controller
driver by mapping its raw hardware capabilities [and quirks, if needed] in a
straightforward way, without having to think about "IRQ flow"
(level/edge/etc.) type of details.
This stands in contrast with the current 'irq-type' model of genirq
architectures, which 'mixes' raw hardware capabilities with 'flow' details.
The patchset supports both types of irq controller designs at once, and
converts i386 and x86_64 to the new irq-chip design.
As a bonus side-effect of the irq-chip approach, chained interrupt controllers
(master/slave PIC constructs, etc.) are now supported by design as well.
The end result of this patchset intends to be simpler architecture-level code
and more consolidation between architectures.
We reused many bits of code and many concepts from Russell King's ARM IRQ
layer, the merging of which was one of the motivations for this patchset.
This patch:
rename desc->handler to desc->chip.
Originally i did not want to do this, because it's a big patch. But having
both "desc->handler", "desc->handle_irq" and "action->handler" caused a
large degree of confusion and made the code appear alot less clean than it
truly is.
I have also attempted a dual approach as well by introducing a
desc->chip alias - but that just wasnt robust enough and broke
frequently.
So lets get over with this quickly. The conversion was done automatically
via scripts and converts all the code in the kernel.
This renaming patch is the first one amongst the patches, so that the
remaining patches can stay flexible and can be merged and split up
without having some big monolithic patch act as a merge barrier.
[akpm@osdl.org: build fix]
[akpm@osdl.org: another build fix]
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-29 09:24:36 +00:00
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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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2005-04-16 22:20:36 +00:00
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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, struct pt_regs *regs)
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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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