Merge master.kernel.org:/pub/scm/linux/kernel/git/davej/cpufreq
[linux-2.6] / arch / arm / mach-pnx4008 / irq.c
1 /*
2  * arch/arm/mach-pnx4008/irq.c
3  *
4  * PNX4008 IRQ controller driver
5  *
6  * Author: Dmitry Chigirev <source@mvista.com>
7  *
8  * Based on reference code received from Philips:
9  * Copyright (C) 2003 Philips Semiconductors
10  *
11  * 2005 (c) MontaVista Software, Inc. This file is licensed under
12  * the terms of the GNU General Public License version 2. This program
13  * is licensed "as is" without any warranty of any kind, whether express
14  * or implied.
15  */
16
17 #include <linux/kernel.h>
18 #include <linux/types.h>
19 #include <linux/mm.h>
20 #include <linux/interrupt.h>
21 #include <linux/list.h>
22 #include <linux/init.h>
23 #include <linux/ioport.h>
24 #include <linux/device.h>
25 #include <asm/hardware.h>
26 #include <asm/irq.h>
27 #include <asm/io.h>
28 #include <asm/setup.h>
29 #include <asm/mach-types.h>
30 #include <asm/pgtable.h>
31 #include <asm/page.h>
32 #include <asm/system.h>
33 #include <asm/mach/arch.h>
34 #include <asm/mach/irq.h>
35 #include <asm/mach/map.h>
36 #include <asm/arch/irq.h>
37
38 static u8 pnx4008_irq_type[NR_IRQS] = PNX4008_IRQ_TYPES;
39
40 static void pnx4008_mask_irq(unsigned int irq)
41 {
42         __raw_writel(__raw_readl(INTC_ER(irq)) & ~INTC_BIT(irq), INTC_ER(irq)); /* mask interrupt */
43 }
44
45 static void pnx4008_unmask_irq(unsigned int irq)
46 {
47         __raw_writel(__raw_readl(INTC_ER(irq)) | INTC_BIT(irq), INTC_ER(irq));  /* unmask interrupt */
48 }
49
50 static void pnx4008_mask_ack_irq(unsigned int irq)
51 {
52         __raw_writel(__raw_readl(INTC_ER(irq)) & ~INTC_BIT(irq), INTC_ER(irq)); /* mask interrupt */
53         __raw_writel(INTC_BIT(irq), INTC_SR(irq));      /* clear interrupt status */
54 }
55
56 static int pnx4008_set_irq_type(unsigned int irq, unsigned int type)
57 {
58         switch (type) {
59         case IRQT_RISING:
60                 __raw_writel(__raw_readl(INTC_ATR(irq)) | INTC_BIT(irq), INTC_ATR(irq));        /*edge sensitive */
61                 __raw_writel(__raw_readl(INTC_APR(irq)) | INTC_BIT(irq), INTC_APR(irq));        /*rising edge */
62                 set_irq_handler(irq, do_edge_IRQ);
63                 break;
64         case IRQT_FALLING:
65                 __raw_writel(__raw_readl(INTC_ATR(irq)) | INTC_BIT(irq), INTC_ATR(irq));        /*edge sensitive */
66                 __raw_writel(__raw_readl(INTC_APR(irq)) & ~INTC_BIT(irq), INTC_APR(irq));       /*falling edge */
67                 set_irq_handler(irq, do_edge_IRQ);
68                 break;
69         case IRQT_LOW:
70                 __raw_writel(__raw_readl(INTC_ATR(irq)) & ~INTC_BIT(irq), INTC_ATR(irq));       /*level sensitive */
71                 __raw_writel(__raw_readl(INTC_APR(irq)) & ~INTC_BIT(irq), INTC_APR(irq));       /*low level */
72                 set_irq_handler(irq, do_level_IRQ);
73                 break;
74         case IRQT_HIGH:
75                 __raw_writel(__raw_readl(INTC_ATR(irq)) & ~INTC_BIT(irq), INTC_ATR(irq));       /*level sensitive */
76                 __raw_writel(__raw_readl(INTC_APR(irq)) | INTC_BIT(irq), INTC_APR(irq));        /* high level */
77                 set_irq_handler(irq, do_level_IRQ);
78                 break;
79
80         /* IRQT_BOTHEDGE is not supported */
81         default:
82                 printk(KERN_ERR "PNX4008 IRQ: Unsupported irq type %d\n", type);
83                 return -1;
84         }
85         return 0;
86 }
87
88 static struct irqchip pnx4008_irq_chip = {
89         .ack = pnx4008_mask_ack_irq,
90         .mask = pnx4008_mask_irq,
91         .unmask = pnx4008_unmask_irq,
92         .set_type = pnx4008_set_irq_type,
93 };
94
95 void __init pnx4008_init_irq(void)
96 {
97         unsigned int i;
98
99         /* configure and enable IRQ 0,1,30,31 (cascade interrupts) mask all others */
100         pnx4008_set_irq_type(SUB1_IRQ_N, pnx4008_irq_type[SUB1_IRQ_N]);
101         pnx4008_set_irq_type(SUB2_IRQ_N, pnx4008_irq_type[SUB2_IRQ_N]);
102         pnx4008_set_irq_type(SUB1_FIQ_N, pnx4008_irq_type[SUB1_FIQ_N]);
103         pnx4008_set_irq_type(SUB2_FIQ_N, pnx4008_irq_type[SUB2_FIQ_N]);
104
105         __raw_writel((1 << SUB2_FIQ_N) | (1 << SUB1_FIQ_N) |
106                         (1 << SUB2_IRQ_N) | (1 << SUB1_IRQ_N),
107                 INTC_ER(MAIN_BASE_INT));
108         __raw_writel(0, INTC_ER(SIC1_BASE_INT));
109         __raw_writel(0, INTC_ER(SIC2_BASE_INT));
110
111         /* configure all other IRQ's */
112         for (i = 0; i < NR_IRQS; i++) {
113                 if (i == SUB2_FIQ_N || i == SUB1_FIQ_N ||
114                         i == SUB2_IRQ_N || i == SUB1_IRQ_N)
115                         continue;
116                 set_irq_flags(i, IRQF_VALID);
117                 set_irq_chip(i, &pnx4008_irq_chip);
118                 pnx4008_set_irq_type(i, pnx4008_irq_type[i]);
119         }
120 }
121