d1bef4ed5f
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>
129 lines
3.0 KiB
C
129 lines
3.0 KiB
C
/* $Id: irq.c,v 1.1.2.4 2002/11/04 20:33:56 lethal Exp $
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*
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* arch/sh/boards/cqreek/irq.c
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*
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* Copyright (C) 2000 Niibe Yutaka
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*
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* CqREEK IDE/ISA Bridge Support.
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*
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*/
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#include <linux/irq.h>
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#include <linux/init.h>
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#include <asm/cqreek/cqreek.h>
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#include <asm/io.h>
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#include <asm/io_generic.h>
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#include <asm/irq.h>
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#include <asm/machvec.h>
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#include <asm/machvec_init.h>
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#include <asm/rtc.h>
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struct cqreek_irq_data {
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unsigned short mask_port; /* Port of Interrupt Mask Register */
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unsigned short stat_port; /* Port of Interrupt Status Register */
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unsigned short bit; /* Value of the bit */
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};
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static struct cqreek_irq_data cqreek_irq_data[NR_IRQS];
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static void disable_cqreek_irq(unsigned int irq)
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{
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unsigned long flags;
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unsigned short mask;
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unsigned short mask_port = cqreek_irq_data[irq].mask_port;
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unsigned short bit = cqreek_irq_data[irq].bit;
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local_irq_save(flags);
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/* Disable IRQ */
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mask = inw(mask_port) & ~bit;
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outw_p(mask, mask_port);
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local_irq_restore(flags);
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}
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static void enable_cqreek_irq(unsigned int irq)
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{
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unsigned long flags;
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unsigned short mask;
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unsigned short mask_port = cqreek_irq_data[irq].mask_port;
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unsigned short bit = cqreek_irq_data[irq].bit;
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local_irq_save(flags);
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/* Enable IRQ */
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mask = inw(mask_port) | bit;
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outw_p(mask, mask_port);
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local_irq_restore(flags);
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}
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static void mask_and_ack_cqreek(unsigned int irq)
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{
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unsigned short stat_port = cqreek_irq_data[irq].stat_port;
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unsigned short bit = cqreek_irq_data[irq].bit;
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disable_cqreek_irq(irq);
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/* Clear IRQ (it might be edge IRQ) */
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inw(stat_port);
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outw_p(bit, stat_port);
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}
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static void end_cqreek_irq(unsigned int irq)
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{
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if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
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enable_cqreek_irq(irq);
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}
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static unsigned int startup_cqreek_irq(unsigned int irq)
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{
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enable_cqreek_irq(irq);
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return 0;
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}
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static void shutdown_cqreek_irq(unsigned int irq)
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{
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disable_cqreek_irq(irq);
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}
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static struct hw_interrupt_type cqreek_irq_type = {
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.typename = "CqREEK-IRQ",
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.startup = startup_cqreek_irq,
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.shutdown = shutdown_cqreek_irq,
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.enable = enable_cqreek_irq,
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.disable = disable_cqreek_irq,
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.ack = mask_and_ack_cqreek,
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.end = end_cqreek_irq
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};
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int cqreek_has_ide, cqreek_has_isa;
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/* XXX: This is just for test for my NE2000 ISA board
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What we really need is virtualized IRQ and demultiplexer like HP600 port */
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void __init init_cqreek_IRQ(void)
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{
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if (cqreek_has_ide) {
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cqreek_irq_data[14].mask_port = BRIDGE_IDE_INTR_MASK;
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cqreek_irq_data[14].stat_port = BRIDGE_IDE_INTR_STAT;
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cqreek_irq_data[14].bit = 1;
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irq_desc[14].chip = &cqreek_irq_type;
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irq_desc[14].status = IRQ_DISABLED;
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irq_desc[14].action = 0;
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irq_desc[14].depth = 1;
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disable_cqreek_irq(14);
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}
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if (cqreek_has_isa) {
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cqreek_irq_data[10].mask_port = BRIDGE_ISA_INTR_MASK;
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cqreek_irq_data[10].stat_port = BRIDGE_ISA_INTR_STAT;
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cqreek_irq_data[10].bit = (1 << 10);
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/* XXX: Err... we may need demultiplexer for ISA irq... */
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irq_desc[10].chip = &cqreek_irq_type;
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irq_desc[10].status = IRQ_DISABLED;
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irq_desc[10].action = 0;
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irq_desc[10].depth = 1;
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disable_cqreek_irq(10);
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}
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}
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