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17#include <linux/init.h>
18#include <linux/module.h>
19#include <linux/interrupt.h>
20#include <linux/ioport.h>
21#include <linux/ptrace.h>
22#include <linux/sysdev.h>
23#include <linux/io.h>
24
25#include <asm/irq.h>
26#include <asm/mach/irq.h>
27
28#include <mach/hardware.h>
29#include <mach/regs-irq.h>
30
31struct group_irq {
32 unsigned long gpen;
33 unsigned int enabled;
34 void (*enable)(struct group_irq *, int enable);
35};
36
37static DEFINE_SPINLOCK(groupirq_lock);
38
39#define DEFINE_GROUP(_name, _ctrlbit, _num) \
40struct group_irq group_##_name = { \
41 .enable = nuc900_group_enable, \
42 .gpen = ((1 << _num) - 1) << _ctrlbit, \
43 }
44
45static void nuc900_group_enable(struct group_irq *gpirq, int enable);
46
47static DEFINE_GROUP(nirq0, 0, 4);
48static DEFINE_GROUP(nirq1, 4, 4);
49static DEFINE_GROUP(usbh, 8, 2);
50static DEFINE_GROUP(ottimer, 16, 3);
51static DEFINE_GROUP(gdma, 20, 2);
52static DEFINE_GROUP(sc, 24, 2);
53static DEFINE_GROUP(i2c, 26, 2);
54static DEFINE_GROUP(ps2, 28, 2);
55
56static int group_irq_enable(struct group_irq *group_irq)
57{
58 unsigned long flags;
59
60 spin_lock_irqsave(&groupirq_lock, flags);
61 if (group_irq->enabled++ == 0)
62 (group_irq->enable)(group_irq, 1);
63 spin_unlock_irqrestore(&groupirq_lock, flags);
64
65 return 0;
66}
67
68static void group_irq_disable(struct group_irq *group_irq)
69{
70 unsigned long flags;
71
72 WARN_ON(group_irq->enabled == 0);
73
74 spin_lock_irqsave(&groupirq_lock, flags);
75 if (--group_irq->enabled == 0)
76 (group_irq->enable)(group_irq, 0);
77 spin_unlock_irqrestore(&groupirq_lock, flags);
78}
79
80static void nuc900_group_enable(struct group_irq *gpirq, int enable)
81{
82 unsigned int groupen = gpirq->gpen;
83 unsigned long regval;
84
85 regval = __raw_readl(REG_AIC_GEN);
86
87 if (enable)
88 regval |= groupen;
89 else
90 regval &= ~groupen;
91
92 __raw_writel(regval, REG_AIC_GEN);
93}
94
95static void nuc900_irq_mask(unsigned int irq)
96{
97 struct group_irq *group_irq;
98
99 group_irq = NULL;
100
101 __raw_writel(1 << irq, REG_AIC_MDCR);
102
103 switch (irq) {
104 case IRQ_GROUP0:
105 group_irq = &group_nirq0;
106 break;
107
108 case IRQ_GROUP1:
109 group_irq = &group_nirq1;
110 break;
111
112 case IRQ_USBH:
113 group_irq = &group_usbh;
114 break;
115
116 case IRQ_T_INT_GROUP:
117 group_irq = &group_ottimer;
118 break;
119
120 case IRQ_GDMAGROUP:
121 group_irq = &group_gdma;
122 break;
123
124 case IRQ_SCGROUP:
125 group_irq = &group_sc;
126 break;
127
128 case IRQ_I2CGROUP:
129 group_irq = &group_i2c;
130 break;
131
132 case IRQ_P2SGROUP:
133 group_irq = &group_ps2;
134 break;
135 }
136
137 if (group_irq)
138 group_irq_disable(group_irq);
139}
140
141
142
143
144
145
146static void nuc900_irq_ack(unsigned int irq)
147{
148 __raw_writel(0x01, REG_AIC_EOSCR);
149}
150
151static void nuc900_irq_unmask(unsigned int irq)
152{
153 struct group_irq *group_irq;
154
155 group_irq = NULL;
156
157 __raw_writel(1 << irq, REG_AIC_MECR);
158
159 switch (irq) {
160 case IRQ_GROUP0:
161 group_irq = &group_nirq0;
162 break;
163
164 case IRQ_GROUP1:
165 group_irq = &group_nirq1;
166 break;
167
168 case IRQ_USBH:
169 group_irq = &group_usbh;
170 break;
171
172 case IRQ_T_INT_GROUP:
173 group_irq = &group_ottimer;
174 break;
175
176 case IRQ_GDMAGROUP:
177 group_irq = &group_gdma;
178 break;
179
180 case IRQ_SCGROUP:
181 group_irq = &group_sc;
182 break;
183
184 case IRQ_I2CGROUP:
185 group_irq = &group_i2c;
186 break;
187
188 case IRQ_P2SGROUP:
189 group_irq = &group_ps2;
190 break;
191 }
192
193 if (group_irq)
194 group_irq_enable(group_irq);
195}
196
197static struct irq_chip nuc900_irq_chip = {
198 .ack = nuc900_irq_ack,
199 .mask = nuc900_irq_mask,
200 .unmask = nuc900_irq_unmask,
201};
202
203void __init nuc900_init_irq(void)
204{
205 int irqno;
206
207 __raw_writel(0xFFFFFFFE, REG_AIC_MDCR);
208
209 for (irqno = IRQ_WDT; irqno <= IRQ_ADC; irqno++) {
210 set_irq_chip(irqno, &nuc900_irq_chip);
211 set_irq_handler(irqno, handle_level_irq);
212 set_irq_flags(irqno, IRQF_VALID);
213 }
214}
215
