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/sysdev.h>
24 struct sys_device sysdev
;
27 extern struct platform_device at32_intc0_device
;
30 * TODO: We may be able to implement mask/unmask by setting IxM flags
31 * in the status register.
33 static void intc_mask_irq(unsigned int irq
)
38 static void intc_unmask_irq(unsigned int irq
)
43 static struct intc intc0
= {
46 .mask
= intc_mask_irq
,
47 .unmask
= intc_unmask_irq
,
52 * All interrupts go via intc at some point.
54 asmlinkage
void do_IRQ(int level
, struct pt_regs
*regs
)
56 struct irq_desc
*desc
;
57 struct pt_regs
*old_regs
;
59 unsigned long status_reg
;
63 old_regs
= set_irq_regs(regs
);
67 irq
= intc_readl(&intc0
, INTCAUSE0
- 4 * level
);
68 desc
= irq_desc
+ irq
;
69 desc
->handle_irq(irq
, desc
);
72 * Clear all interrupt level masks so that we may handle
73 * interrupts during softirq processing. If this is a nested
74 * interrupt, interrupts must stay globally disabled until we
77 status_reg
= sysreg_read(SR
);
78 status_reg
&= ~(SYSREG_BIT(I0M
) | SYSREG_BIT(I1M
)
79 | SYSREG_BIT(I2M
) | SYSREG_BIT(I3M
));
80 sysreg_write(SR
, status_reg
);
84 set_irq_regs(old_regs
);
87 void __init
init_IRQ(void)
89 extern void _evba(void);
90 extern void irq_level0(void);
91 struct resource
*regs
;
96 regs
= platform_get_resource(&at32_intc0_device
, IORESOURCE_MEM
, 0);
98 printk(KERN_EMERG
"intc: no mmio resource defined\n");
101 pclk
= clk_get(&at32_intc0_device
.dev
, "pclk");
103 printk(KERN_EMERG
"intc: no clock defined\n");
109 intc0
.regs
= ioremap(regs
->start
, regs
->end
- regs
->start
+ 1);
111 printk(KERN_EMERG
"intc: failed to map registers (0x%08lx)\n",
112 (unsigned long)regs
->start
);
117 * Initialize all interrupts to level 0 (lowest priority). The
118 * priority level may be changed by calling
119 * irq_set_priority().
122 offset
= (unsigned long)&irq_level0
- (unsigned long)&_evba
;
123 for (i
= 0; i
< NR_INTERNAL_IRQS
; i
++) {
124 intc_writel(&intc0
, INTPR0
+ 4 * i
, offset
);
125 readback
= intc_readl(&intc0
, INTPR0
+ 4 * i
);
126 if (readback
== offset
)
127 set_irq_chip_and_handler(i
, &intc0
.chip
,
131 /* Unmask all interrupt levels */
132 sysreg_write(SR
, (sysreg_read(SR
)
133 & ~(SR_I3M
| SR_I2M
| SR_I1M
| SR_I0M
)));
138 panic("Interrupt controller initialization failed!\n");
141 static struct sysdev_class intc_class
= {
145 static int __init
intc_init_sysdev(void)
149 ret
= sysdev_class_register(&intc_class
);
154 intc0
.sysdev
.cls
= &intc_class
;
155 ret
= sysdev_register(&intc0
.sysdev
);
159 device_initcall(intc_init_sysdev
);
161 unsigned long intc_get_pending(unsigned int group
)
163 return intc_readl(&intc0
, INTREQ0
+ 4 * group
);
165 EXPORT_SYMBOL_GPL(intc_get_pending
);