103 lines
3 KiB
C
103 lines
3 KiB
C
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/*
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* Interrupt routines for Gemini
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*
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* Copyright (C) 2001-2006 Storlink, Corp.
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* Copyright (C) 2008-2009 Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/ioport.h>
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#include <linux/stddef.h>
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#include <linux/list.h>
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#include <linux/sched.h>
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#include <asm/irq.h>
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#include <asm/mach/irq.h>
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#include <mach/hardware.h>
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#define IRQ_SOURCE(base_addr) (base_addr + 0x00)
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#define IRQ_MASK(base_addr) (base_addr + 0x04)
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#define IRQ_CLEAR(base_addr) (base_addr + 0x08)
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#define IRQ_TMODE(base_addr) (base_addr + 0x0C)
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#define IRQ_TLEVEL(base_addr) (base_addr + 0x10)
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#define IRQ_STATUS(base_addr) (base_addr + 0x14)
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#define FIQ_SOURCE(base_addr) (base_addr + 0x20)
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#define FIQ_MASK(base_addr) (base_addr + 0x24)
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#define FIQ_CLEAR(base_addr) (base_addr + 0x28)
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#define FIQ_TMODE(base_addr) (base_addr + 0x2C)
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#define FIQ_LEVEL(base_addr) (base_addr + 0x30)
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#define FIQ_STATUS(base_addr) (base_addr + 0x34)
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static void gemini_ack_irq(unsigned int irq)
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{
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__raw_writel(1 << irq, IRQ_CLEAR(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
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}
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static void gemini_mask_irq(unsigned int irq)
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{
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unsigned int mask;
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mask = __raw_readl(IRQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
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mask &= ~(1 << irq);
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__raw_writel(mask, IRQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
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}
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static void gemini_unmask_irq(unsigned int irq)
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{
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unsigned int mask;
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mask = __raw_readl(IRQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
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mask |= (1 << irq);
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__raw_writel(mask, IRQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
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}
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static struct irq_chip gemini_irq_chip = {
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.name = "INTC",
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.ack = gemini_ack_irq,
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.mask = gemini_mask_irq,
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.unmask = gemini_unmask_irq,
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};
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static struct resource irq_resource = {
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.name = "irq_handler",
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.start = IO_ADDRESS(GEMINI_INTERRUPT_BASE),
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.end = IO_ADDRESS(FIQ_STATUS(GEMINI_INTERRUPT_BASE)) + 4,
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};
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void __init gemini_init_irq(void)
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{
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unsigned int i, mode = 0, level = 0;
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/*
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* Disable arch_idle() by default since it is buggy
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* For more info see arch/arm/mach-gemini/include/mach/system.h
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*/
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disable_hlt();
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request_resource(&iomem_resource, &irq_resource);
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for (i = 0; i < NR_IRQS; i++) {
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set_irq_chip(i, &gemini_irq_chip);
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if((i >= IRQ_TIMER1 && i <= IRQ_TIMER3) || (i >= IRQ_SERIRQ0 && i <= IRQ_SERIRQ1)) {
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set_irq_handler(i, handle_edge_irq);
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mode |= 1 << i;
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level |= 1 << i;
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} else {
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set_irq_handler(i, handle_level_irq);
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}
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set_irq_flags(i, IRQF_VALID | IRQF_PROBE);
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}
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/* Disable all interrupts */
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__raw_writel(0, IRQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
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__raw_writel(0, FIQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
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/* Set interrupt mode */
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__raw_writel(mode, IRQ_TMODE(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
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__raw_writel(level, IRQ_TLEVEL(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
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}
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