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 <linux/cpu.h>
19
20 #include <asm/irq.h>
21 #include <asm/mach/irq.h>
22 #include <asm/system_misc.h>
23 #include <mach/hardware.h>
24
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)
37
gemini_ack_irq(struct irq_data * d)38 static void gemini_ack_irq(struct irq_data *d)
39 {
40 __raw_writel(1 << d->irq, IRQ_CLEAR(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
41 }
42
gemini_mask_irq(struct irq_data * d)43 static void gemini_mask_irq(struct irq_data *d)
44 {
45 unsigned int mask;
46
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)));
50 }
51
gemini_unmask_irq(struct irq_data * d)52 static void gemini_unmask_irq(struct irq_data *d)
53 {
54 unsigned int mask;
55
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)));
59 }
60
61 static struct irq_chip gemini_irq_chip = {
62 .name = "INTC",
63 .irq_ack = gemini_ack_irq,
64 .irq_mask = gemini_mask_irq,
65 .irq_unmask = gemini_unmask_irq,
66 };
67
68 static struct resource irq_resource = {
69 .name = "irq_handler",
70 .start = GEMINI_INTERRUPT_BASE,
71 .end = FIQ_STATUS(GEMINI_INTERRUPT_BASE) + 4,
72 };
73
gemini_init_irq(void)74 void __init gemini_init_irq(void)
75 {
76 unsigned int i, mode = 0, level = 0;
77
78 /*
79 * Disable the idle handler by default since it is buggy
80 * For more info see arch/arm/mach-gemini/idle.c
81 */
82 cpu_idle_poll_ctrl(true);
83
84 request_resource(&iomem_resource, &irq_resource);
85
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);
90 mode |= 1 << i;
91 level |= 1 << i;
92 } else {
93 irq_set_handler(i, handle_level_irq);
94 }
95 irq_clear_status_flags(i, IRQ_NOREQUEST | IRQ_NOPROBE);
96 }
97
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)));
101
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)));
105 }
106