201 lines
4.1 KiB
C
201 lines
4.1 KiB
C
/*
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* Copyright (C) 2006, 2008 Atmel Corporation
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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 version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/clk.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/platform_device.h>
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#include <linux/syscore_ops.h>
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#include <linux/export.h>
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#include <asm/io.h>
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#include "intc.h"
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struct intc {
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void __iomem *regs;
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struct irq_chip chip;
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#ifdef CONFIG_PM
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unsigned long suspend_ipr;
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unsigned long saved_ipr[64];
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#endif
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};
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extern struct platform_device at32_intc0_device;
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/*
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* TODO: We may be able to implement mask/unmask by setting IxM flags
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* in the status register.
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*/
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static void intc_mask_irq(struct irq_data *d)
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{
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}
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static void intc_unmask_irq(struct irq_data *d)
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{
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}
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static struct intc intc0 = {
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.chip = {
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.name = "intc",
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.irq_mask = intc_mask_irq,
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.irq_unmask = intc_unmask_irq,
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},
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};
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/*
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* All interrupts go via intc at some point.
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*/
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asmlinkage void do_IRQ(int level, struct pt_regs *regs)
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{
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struct pt_regs *old_regs;
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unsigned int irq;
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unsigned long status_reg;
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local_irq_disable();
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old_regs = set_irq_regs(regs);
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irq_enter();
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irq = intc_readl(&intc0, INTCAUSE0 - 4 * level);
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generic_handle_irq(irq);
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/*
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* Clear all interrupt level masks so that we may handle
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* interrupts during softirq processing. If this is a nested
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* interrupt, interrupts must stay globally disabled until we
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* return.
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*/
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status_reg = sysreg_read(SR);
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status_reg &= ~(SYSREG_BIT(I0M) | SYSREG_BIT(I1M)
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| SYSREG_BIT(I2M) | SYSREG_BIT(I3M));
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sysreg_write(SR, status_reg);
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irq_exit();
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set_irq_regs(old_regs);
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}
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void __init init_IRQ(void)
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{
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extern void _evba(void);
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extern void irq_level0(void);
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struct resource *regs;
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struct clk *pclk;
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unsigned int i;
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u32 offset, readback;
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regs = platform_get_resource(&at32_intc0_device, IORESOURCE_MEM, 0);
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if (!regs) {
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printk(KERN_EMERG "intc: no mmio resource defined\n");
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goto fail;
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}
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pclk = clk_get(&at32_intc0_device.dev, "pclk");
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if (IS_ERR(pclk)) {
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printk(KERN_EMERG "intc: no clock defined\n");
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goto fail;
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}
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clk_enable(pclk);
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intc0.regs = ioremap(regs->start, resource_size(regs));
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if (!intc0.regs) {
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printk(KERN_EMERG "intc: failed to map registers (0x%08lx)\n",
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(unsigned long)regs->start);
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goto fail;
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}
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/*
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* Initialize all interrupts to level 0 (lowest priority). The
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* priority level may be changed by calling
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* irq_set_priority().
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*
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*/
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offset = (unsigned long)&irq_level0 - (unsigned long)&_evba;
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for (i = 0; i < NR_INTERNAL_IRQS; i++) {
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intc_writel(&intc0, INTPR0 + 4 * i, offset);
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readback = intc_readl(&intc0, INTPR0 + 4 * i);
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if (readback == offset)
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irq_set_chip_and_handler(i, &intc0.chip,
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handle_simple_irq);
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}
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/* Unmask all interrupt levels */
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sysreg_write(SR, (sysreg_read(SR)
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& ~(SR_I3M | SR_I2M | SR_I1M | SR_I0M)));
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return;
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fail:
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panic("Interrupt controller initialization failed!\n");
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}
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#ifdef CONFIG_PM
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void intc_set_suspend_handler(unsigned long offset)
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{
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intc0.suspend_ipr = offset;
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}
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static int intc_suspend(void)
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{
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int i;
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if (unlikely(!irqs_disabled())) {
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pr_err("intc_suspend: called with interrupts enabled\n");
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return -EINVAL;
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}
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if (unlikely(!intc0.suspend_ipr)) {
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pr_err("intc_suspend: suspend_ipr not initialized\n");
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return -EINVAL;
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}
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for (i = 0; i < 64; i++) {
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intc0.saved_ipr[i] = intc_readl(&intc0, INTPR0 + 4 * i);
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intc_writel(&intc0, INTPR0 + 4 * i, intc0.suspend_ipr);
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}
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return 0;
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}
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static void intc_resume(void)
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{
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int i;
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for (i = 0; i < 64; i++)
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intc_writel(&intc0, INTPR0 + 4 * i, intc0.saved_ipr[i]);
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}
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#else
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#define intc_suspend NULL
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#define intc_resume NULL
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#endif
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static struct syscore_ops intc_syscore_ops = {
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.suspend = intc_suspend,
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.resume = intc_resume,
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};
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static int __init intc_init_syscore(void)
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{
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register_syscore_ops(&intc_syscore_ops);
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return 0;
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}
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device_initcall(intc_init_syscore);
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unsigned long intc_get_pending(unsigned int group)
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{
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return intc_readl(&intc0, INTREQ0 + 4 * group);
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}
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EXPORT_SYMBOL_GPL(intc_get_pending);
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