2 * Interrupt routines for Gemini
4 * Copyright (C) 2001-2006 Storlink, Corp.
5 * Copyright (C) 2008-2009 Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 #include <linux/init.h>
14 #include <linux/ioport.h>
15 #include <linux/stddef.h>
16 #include <linux/list.h>
17 #include <linux/sched.h>
18 #include <linux/cpu.h>
21 #include <asm/mach/irq.h>
22 #include <asm/system_misc.h>
23 #include <mach/hardware.h>
25 #define IRQ_SOURCE(base_addr) (base_addr + 0x00)
26 #define IRQ_MASK(base_addr) (base_addr + 0x04)
27 #define IRQ_CLEAR(base_addr) (base_addr + 0x08)
28 #define IRQ_TMODE(base_addr) (base_addr + 0x0C)
29 #define IRQ_TLEVEL(base_addr) (base_addr + 0x10)
30 #define IRQ_STATUS(base_addr) (base_addr + 0x14)
31 #define FIQ_SOURCE(base_addr) (base_addr + 0x20)
32 #define FIQ_MASK(base_addr) (base_addr + 0x24)
33 #define FIQ_CLEAR(base_addr) (base_addr + 0x28)
34 #define FIQ_TMODE(base_addr) (base_addr + 0x2C)
35 #define FIQ_LEVEL(base_addr) (base_addr + 0x30)
36 #define FIQ_STATUS(base_addr) (base_addr + 0x34)
38 static void gemini_ack_irq(struct irq_data
*d
)
40 __raw_writel(1 << d
->irq
, IRQ_CLEAR(IO_ADDRESS(GEMINI_INTERRUPT_BASE
)));
43 static void gemini_mask_irq(struct irq_data
*d
)
47 mask
= __raw_readl(IRQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE
)));
48 mask
&= ~(1 << d
->irq
);
49 __raw_writel(mask
, IRQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE
)));
52 static void gemini_unmask_irq(struct irq_data
*d
)
56 mask
= __raw_readl(IRQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE
)));
57 mask
|= (1 << d
->irq
);
58 __raw_writel(mask
, IRQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE
)));
61 static struct irq_chip gemini_irq_chip
= {
63 .irq_ack
= gemini_ack_irq
,
64 .irq_mask
= gemini_mask_irq
,
65 .irq_unmask
= gemini_unmask_irq
,
68 static struct resource irq_resource
= {
69 .name
= "irq_handler",
70 .start
= GEMINI_INTERRUPT_BASE
,
71 .end
= FIQ_STATUS(GEMINI_INTERRUPT_BASE
) + 4,
74 void __init
gemini_init_irq(void)
76 unsigned int i
, mode
= 0, level
= 0;
79 * Disable the idle handler by default since it is buggy
80 * For more info see arch/arm/mach-gemini/idle.c
82 cpu_idle_poll_ctrl(true);
84 request_resource(&iomem_resource
, &irq_resource
);
86 for (i
= 0; i
< NR_IRQS
; i
++) {
87 irq_set_chip(i
, &gemini_irq_chip
);
88 if((i
>= IRQ_TIMER1
&& i
<= IRQ_TIMER3
) || (i
>= IRQ_SERIRQ0
&& i
<= IRQ_SERIRQ1
)) {
89 irq_set_handler(i
, handle_edge_irq
);
93 irq_set_handler(i
, handle_level_irq
);
95 irq_clear_status_flags(i
, IRQ_NOREQUEST
| IRQ_NOPROBE
);
98 /* Disable all interrupts */
99 __raw_writel(0, IRQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE
)));
100 __raw_writel(0, FIQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE
)));
102 /* Set interrupt mode */
103 __raw_writel(mode
, IRQ_TMODE(IO_ADDRESS(GEMINI_INTERRUPT_BASE
)));
104 __raw_writel(level
, IRQ_TLEVEL(IO_ADDRESS(GEMINI_INTERRUPT_BASE
)));