1 /*
2 * Interrupt routines for Gemini
3 *
4 * Copyright (C) 2001-2006 Storlink, Corp.
5 * Copyright (C) 2008-2009 Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
6 *
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.
11 */
12 #include <linux/init.h>
13 #include <linux/io.h>
14 #include <linux/ioport.h>
15 #include <linux/stddef.h>
16 #include <linux/list.h>
17 #include <linux/sched.h>
18 #include <asm/irq.h>
19 #include <asm/mach/irq.h>
20 #include <mach/hardware.h>
21
22 #define IRQ_SOURCE(base_addr) (base_addr + 0x00)
23 #define IRQ_MASK(base_addr) (base_addr + 0x04)
24 #define IRQ_CLEAR(base_addr) (base_addr + 0x08)
25 #define IRQ_TMODE(base_addr) (base_addr + 0x0C)
26 #define IRQ_TLEVEL(base_addr) (base_addr + 0x10)
27 #define IRQ_STATUS(base_addr) (base_addr + 0x14)
28 #define FIQ_SOURCE(base_addr) (base_addr + 0x20)
29 #define FIQ_MASK(base_addr) (base_addr + 0x24)
30 #define FIQ_CLEAR(base_addr) (base_addr + 0x28)
31 #define FIQ_TMODE(base_addr) (base_addr + 0x2C)
32 #define FIQ_LEVEL(base_addr) (base_addr + 0x30)
33 #define FIQ_STATUS(base_addr) (base_addr + 0x34)
34
gemini_ack_irq(struct irq_data * d)35 static void gemini_ack_irq(struct irq_data *d)
36 {
37 __raw_writel(1 << d->irq, IRQ_CLEAR(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
38 }
39
gemini_mask_irq(struct irq_data * d)40 static void gemini_mask_irq(struct irq_data *d)
41 {
42 unsigned int mask;
43
44 mask = __raw_readl(IRQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
45 mask &= ~(1 << d->irq);
46 __raw_writel(mask, IRQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
47 }
48
gemini_unmask_irq(struct irq_data * d)49 static void gemini_unmask_irq(struct irq_data *d)
50 {
51 unsigned int mask;
52
53 mask = __raw_readl(IRQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
54 mask |= (1 << d->irq);
55 __raw_writel(mask, IRQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
56 }
57
58 static struct irq_chip gemini_irq_chip = {
59 .name = "INTC",
60 .irq_ack = gemini_ack_irq,
61 .irq_mask = gemini_mask_irq,
62 .irq_unmask = gemini_unmask_irq,
63 };
64
65 static struct resource irq_resource = {
66 .name = "irq_handler",
67 .start = IO_ADDRESS(GEMINI_INTERRUPT_BASE),
68 .end = IO_ADDRESS(FIQ_STATUS(GEMINI_INTERRUPT_BASE)) + 4,
69 };
70
gemini_init_irq(void)71 void __init gemini_init_irq(void)
72 {
73 unsigned int i, mode = 0, level = 0;
74
75 /*
76 * Disable the idle handler by default since it is buggy
77 * For more info see arch/arm/mach-gemini/idle.c
78 */
79 disable_hlt();
80
81 request_resource(&iomem_resource, &irq_resource);
82
83 for (i = 0; i < NR_IRQS; i++) {
84 irq_set_chip(i, &gemini_irq_chip);
85 if((i >= IRQ_TIMER1 && i <= IRQ_TIMER3) || (i >= IRQ_SERIRQ0 && i <= IRQ_SERIRQ1)) {
86 irq_set_handler(i, handle_edge_irq);
87 mode |= 1 << i;
88 level |= 1 << i;
89 } else {
90 irq_set_handler(i, handle_level_irq);
91 }
92 set_irq_flags(i, IRQF_VALID | IRQF_PROBE);
93 }
94
95 /* Disable all interrupts */
96 __raw_writel(0, IRQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
97 __raw_writel(0, FIQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
98
99 /* Set interrupt mode */
100 __raw_writel(mode, IRQ_TMODE(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
101 __raw_writel(level, IRQ_TLEVEL(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
102 }
103