2 * Copyright (C) 2006, 2008 Atmel Corporation
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
10 #include <linux/err.h>
11 #include <linux/init.h>
12 #include <linux/interrupt.h>
13 #include <linux/irq.h>
14 #include <linux/platform_device.h>
15 #include <linux/syscore_ops.h>
16 #include <linux/export.h>
26 unsigned long suspend_ipr;
27 unsigned long saved_ipr[64];
31 extern struct platform_device at32_intc0_device;
34 * TODO: We may be able to implement mask/unmask by setting IxM flags
35 * in the status register.
37 static void intc_mask_irq(struct irq_data *d)
42 static void intc_unmask_irq(struct irq_data *d)
47 static struct intc intc0 = {
50 .irq_mask = intc_mask_irq,
51 .irq_unmask = intc_unmask_irq,
56 * All interrupts go via intc at some point.
58 asmlinkage void do_IRQ(int level, struct pt_regs *regs)
60 struct pt_regs *old_regs;
62 unsigned long status_reg;
66 old_regs = set_irq_regs(regs);
70 irq = intc_readl(&intc0, INTCAUSE0 - 4 * level);
71 generic_handle_irq(irq);
74 * Clear all interrupt level masks so that we may handle
75 * interrupts during softirq processing. If this is a nested
76 * interrupt, interrupts must stay globally disabled until we
79 status_reg = sysreg_read(SR);
80 status_reg &= ~(SYSREG_BIT(I0M) | SYSREG_BIT(I1M)
81 | SYSREG_BIT(I2M) | SYSREG_BIT(I3M));
82 sysreg_write(SR, status_reg);
86 set_irq_regs(old_regs);
89 void __init init_IRQ(void)
91 extern void _evba(void);
92 extern void irq_level0(void);
93 struct resource *regs;
98 regs = platform_get_resource(&at32_intc0_device, IORESOURCE_MEM, 0);
100 printk(KERN_EMERG "intc: no mmio resource defined\n");
103 pclk = clk_get(&at32_intc0_device.dev, "pclk");
105 printk(KERN_EMERG "intc: no clock defined\n");
111 intc0.regs = ioremap(regs->start, resource_size(regs));
113 printk(KERN_EMERG "intc: failed to map registers (0x%08lx)\n",
114 (unsigned long)regs->start);
119 * Initialize all interrupts to level 0 (lowest priority). The
120 * priority level may be changed by calling
121 * irq_set_priority().
124 offset = (unsigned long)&irq_level0 - (unsigned long)&_evba;
125 for (i = 0; i < NR_INTERNAL_IRQS; i++) {
126 intc_writel(&intc0, INTPR0 + 4 * i, offset);
127 readback = intc_readl(&intc0, INTPR0 + 4 * i);
128 if (readback == offset)
129 irq_set_chip_and_handler(i, &intc0.chip,
133 /* Unmask all interrupt levels */
134 sysreg_write(SR, (sysreg_read(SR)
135 & ~(SR_I3M | SR_I2M | SR_I1M | SR_I0M)));
140 panic("Interrupt controller initialization failed!\n");
144 void intc_set_suspend_handler(unsigned long offset)
146 intc0.suspend_ipr = offset;
149 static int intc_suspend(void)
153 if (unlikely(!irqs_disabled())) {
154 pr_err("intc_suspend: called with interrupts enabled\n");
158 if (unlikely(!intc0.suspend_ipr)) {
159 pr_err("intc_suspend: suspend_ipr not initialized\n");
163 for (i = 0; i < 64; i++) {
164 intc0.saved_ipr[i] = intc_readl(&intc0, INTPR0 + 4 * i);
165 intc_writel(&intc0, INTPR0 + 4 * i, intc0.suspend_ipr);
171 static void intc_resume(void)
175 for (i = 0; i < 64; i++)
176 intc_writel(&intc0, INTPR0 + 4 * i, intc0.saved_ipr[i]);
179 #define intc_suspend NULL
180 #define intc_resume NULL
183 static struct syscore_ops intc_syscore_ops = {
184 .suspend = intc_suspend,
185 .resume = intc_resume,
188 static int __init intc_init_syscore(void)
190 register_syscore_ops(&intc_syscore_ops);
194 device_initcall(intc_init_syscore);
196 unsigned long intc_get_pending(unsigned int group)
198 return intc_readl(&intc0, INTREQ0 + 4 * group);
200 EXPORT_SYMBOL_GPL(intc_get_pending);