5461af5af5
By Ingo Molnar, interrupts are not masked by default.
(refer to 76d2160147)
But if interrupts are not masked, the processor can wake up while in
Suspend-to-RAM state by an external interrupt. For example, if an
OMAP3 board is connected to Host PC by USB and entered to Suspend-to-RAM
state, it wake up automatically by M_IRQ_92. The disable_irq() function
can't disable the interrupt in H/W level, So I modified
arch/arm/mach-omap2/irq.c
Signed-off-by: Kim Kyuwon <chammoru@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
190 lines
4.5 KiB
C
190 lines
4.5 KiB
C
/*
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* linux/arch/arm/mach-omap2/irq.c
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*
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* Interrupt handler for OMAP2 boards.
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*
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* Copyright (C) 2005 Nokia Corporation
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* Author: Paul Mundt <paul.mundt@nokia.com>
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <mach/hardware.h>
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#include <asm/mach/irq.h>
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/* selected INTC register offsets */
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#define INTC_REVISION 0x0000
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#define INTC_SYSCONFIG 0x0010
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#define INTC_SYSSTATUS 0x0014
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#define INTC_SIR 0x0040
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#define INTC_CONTROL 0x0048
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#define INTC_MIR_CLEAR0 0x0088
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#define INTC_MIR_SET0 0x008c
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#define INTC_PENDING_IRQ0 0x0098
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/* Number of IRQ state bits in each MIR register */
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#define IRQ_BITS_PER_REG 32
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/*
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* OMAP2 has a number of different interrupt controllers, each interrupt
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* controller is identified as its own "bank". Register definitions are
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* fairly consistent for each bank, but not all registers are implemented
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* for each bank.. when in doubt, consult the TRM.
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*/
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static struct omap_irq_bank {
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void __iomem *base_reg;
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unsigned int nr_irqs;
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} __attribute__ ((aligned(4))) irq_banks[] = {
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{
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/* MPU INTC */
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.base_reg = 0,
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.nr_irqs = 96,
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},
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};
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/* INTC bank register get/set */
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static void intc_bank_write_reg(u32 val, struct omap_irq_bank *bank, u16 reg)
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{
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__raw_writel(val, bank->base_reg + reg);
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}
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static u32 intc_bank_read_reg(struct omap_irq_bank *bank, u16 reg)
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{
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return __raw_readl(bank->base_reg + reg);
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}
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static int previous_irq;
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/*
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* On 34xx we can get occasional spurious interrupts if the ack from
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* an interrupt handler does not get posted before we unmask. Warn about
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* the interrupt handlers that need to flush posted writes.
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*/
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static int omap_check_spurious(unsigned int irq)
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{
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u32 sir, spurious;
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sir = intc_bank_read_reg(&irq_banks[0], INTC_SIR);
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spurious = sir >> 6;
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if (spurious > 1) {
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printk(KERN_WARNING "Spurious irq %i: 0x%08x, please flush "
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"posted write for irq %i\n",
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irq, sir, previous_irq);
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return spurious;
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}
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return 0;
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}
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/* XXX: FIQ and additional INTC support (only MPU at the moment) */
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static void omap_ack_irq(unsigned int irq)
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{
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intc_bank_write_reg(0x1, &irq_banks[0], INTC_CONTROL);
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}
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static void omap_mask_irq(unsigned int irq)
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{
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int offset = irq & (~(IRQ_BITS_PER_REG - 1));
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if (cpu_is_omap34xx()) {
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int spurious = 0;
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/*
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* INT_34XX_GPT12_IRQ is also the spurious irq. Maybe because
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* it is the highest irq number?
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*/
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if (irq == INT_34XX_GPT12_IRQ)
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spurious = omap_check_spurious(irq);
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if (!spurious)
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previous_irq = irq;
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}
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irq &= (IRQ_BITS_PER_REG - 1);
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intc_bank_write_reg(1 << irq, &irq_banks[0], INTC_MIR_SET0 + offset);
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}
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static void omap_unmask_irq(unsigned int irq)
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{
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int offset = irq & (~(IRQ_BITS_PER_REG - 1));
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irq &= (IRQ_BITS_PER_REG - 1);
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intc_bank_write_reg(1 << irq, &irq_banks[0], INTC_MIR_CLEAR0 + offset);
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}
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static void omap_mask_ack_irq(unsigned int irq)
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{
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omap_mask_irq(irq);
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omap_ack_irq(irq);
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}
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static struct irq_chip omap_irq_chip = {
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.name = "INTC",
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.ack = omap_mask_ack_irq,
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.mask = omap_mask_irq,
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.unmask = omap_unmask_irq,
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.disable = omap_mask_irq,
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};
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static void __init omap_irq_bank_init_one(struct omap_irq_bank *bank)
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{
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unsigned long tmp;
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tmp = intc_bank_read_reg(bank, INTC_REVISION) & 0xff;
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printk(KERN_INFO "IRQ: Found an INTC at 0x%p "
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"(revision %ld.%ld) with %d interrupts\n",
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bank->base_reg, tmp >> 4, tmp & 0xf, bank->nr_irqs);
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tmp = intc_bank_read_reg(bank, INTC_SYSCONFIG);
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tmp |= 1 << 1; /* soft reset */
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intc_bank_write_reg(tmp, bank, INTC_SYSCONFIG);
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while (!(intc_bank_read_reg(bank, INTC_SYSSTATUS) & 0x1))
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/* Wait for reset to complete */;
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/* Enable autoidle */
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intc_bank_write_reg(1 << 0, bank, INTC_SYSCONFIG);
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}
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void __init omap_init_irq(void)
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{
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unsigned long nr_of_irqs = 0;
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unsigned int nr_banks = 0;
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int i;
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for (i = 0; i < ARRAY_SIZE(irq_banks); i++) {
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struct omap_irq_bank *bank = irq_banks + i;
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if (cpu_is_omap24xx())
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bank->base_reg = OMAP2_IO_ADDRESS(OMAP24XX_IC_BASE);
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else if (cpu_is_omap34xx())
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bank->base_reg = OMAP2_IO_ADDRESS(OMAP34XX_IC_BASE);
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omap_irq_bank_init_one(bank);
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nr_of_irqs += bank->nr_irqs;
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nr_banks++;
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}
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printk(KERN_INFO "Total of %ld interrupts on %d active controller%s\n",
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nr_of_irqs, nr_banks, nr_banks > 1 ? "s" : "");
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for (i = 0; i < nr_of_irqs; i++) {
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set_irq_chip(i, &omap_irq_chip);
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set_irq_handler(i, handle_level_irq);
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set_irq_flags(i, IRQF_VALID);
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}
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}
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