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c728d604 YS |
1 | /* |
2 | * linux/arch/h8300/kernel/irq.c | |
3 | * | |
4 | * Copyright 2007 Yoshinori Sato <ysato@users.sourceforge.jp> | |
5 | */ | |
6 | ||
7 | #include <linux/module.h> | |
8 | #include <linux/types.h> | |
9 | #include <linux/kernel.h> | |
10 | #include <linux/sched.h> | |
11 | #include <linux/kernel_stat.h> | |
12 | #include <linux/seq_file.h> | |
13 | #include <linux/init.h> | |
14 | #include <linux/random.h> | |
15 | #include <linux/bootmem.h> | |
16 | #include <linux/irq.h> | |
f74596d0 | 17 | #include <linux/interrupt.h> |
c728d604 YS |
18 | |
19 | #include <asm/system.h> | |
20 | #include <asm/traps.h> | |
21 | #include <asm/io.h> | |
22 | #include <asm/setup.h> | |
23 | #include <asm/errno.h> | |
24 | ||
25 | /*#define DEBUG*/ | |
26 | ||
27 | extern unsigned long *interrupt_redirect_table; | |
28 | extern const int h8300_saved_vectors[]; | |
5cc265a5 | 29 | extern const h8300_vector h8300_trap_table[]; |
c728d604 YS |
30 | int h8300_enable_irq_pin(unsigned int irq); |
31 | void h8300_disable_irq_pin(unsigned int irq); | |
32 | ||
33 | #define CPU_VECTOR ((unsigned long *)0x000000) | |
34 | #define ADDR_MASK (0xffffff) | |
35 | ||
36 | static inline int is_ext_irq(unsigned int irq) | |
37 | { | |
38 | return (irq >= EXT_IRQ0 && irq <= (EXT_IRQ0 + EXT_IRQS)); | |
39 | } | |
40 | ||
41 | static void h8300_enable_irq(unsigned int irq) | |
42 | { | |
43 | if (is_ext_irq(irq)) | |
44 | IER_REGS |= 1 << (irq - EXT_IRQ0); | |
45 | } | |
46 | ||
47 | static void h8300_disable_irq(unsigned int irq) | |
48 | { | |
49 | if (is_ext_irq(irq)) | |
50 | IER_REGS &= ~(1 << (irq - EXT_IRQ0)); | |
51 | } | |
52 | ||
53 | static void h8300_end_irq(unsigned int irq) | |
54 | { | |
55 | } | |
56 | ||
57 | static unsigned int h8300_startup_irq(unsigned int irq) | |
58 | { | |
59 | if (is_ext_irq(irq)) | |
60 | return h8300_enable_irq_pin(irq); | |
61 | else | |
62 | return 0; | |
63 | } | |
64 | ||
65 | static void h8300_shutdown_irq(unsigned int irq) | |
66 | { | |
67 | if (is_ext_irq(irq)) | |
68 | h8300_disable_irq_pin(irq); | |
69 | } | |
70 | ||
71 | /* | |
3a4fa0a2 | 72 | * h8300 interrupt controller implementation |
c728d604 YS |
73 | */ |
74 | struct irq_chip h8300irq_chip = { | |
75 | .name = "H8300-INTC", | |
76 | .startup = h8300_startup_irq, | |
77 | .shutdown = h8300_shutdown_irq, | |
78 | .enable = h8300_enable_irq, | |
79 | .disable = h8300_disable_irq, | |
80 | .ack = NULL, | |
81 | .end = h8300_end_irq, | |
82 | }; | |
83 | ||
84 | void ack_bad_irq(unsigned int irq) | |
85 | { | |
86 | printk("unexpected IRQ trap at vector %02x\n", irq); | |
87 | } | |
88 | ||
89 | #if defined(CONFIG_RAMKERNEL) | |
90 | static unsigned long __init *get_vector_address(void) | |
91 | { | |
92 | unsigned long *rom_vector = CPU_VECTOR; | |
93 | unsigned long base,tmp; | |
94 | int vec_no; | |
95 | ||
96 | base = rom_vector[EXT_IRQ0] & ADDR_MASK; | |
97 | ||
98 | /* check romvector format */ | |
99 | for (vec_no = EXT_IRQ1; vec_no <= EXT_IRQ0+EXT_IRQS; vec_no++) { | |
100 | if ((base+(vec_no - EXT_IRQ0)*4) != (rom_vector[vec_no] & ADDR_MASK)) | |
101 | return NULL; | |
102 | } | |
103 | ||
104 | /* ramvector base address */ | |
105 | base -= EXT_IRQ0*4; | |
106 | ||
107 | /* writerble check */ | |
108 | tmp = ~(*(volatile unsigned long *)base); | |
109 | (*(volatile unsigned long *)base) = tmp; | |
110 | if ((*(volatile unsigned long *)base) != tmp) | |
111 | return NULL; | |
112 | return (unsigned long *)base; | |
113 | } | |
114 | ||
115 | static void __init setup_vector(void) | |
116 | { | |
117 | int i; | |
118 | unsigned long *ramvec,*ramvec_p; | |
5cc265a5 | 119 | const h8300_vector *trap_entry; |
c728d604 YS |
120 | const int *saved_vector; |
121 | ||
122 | ramvec = get_vector_address(); | |
123 | if (ramvec == NULL) | |
124 | panic("interrupt vector serup failed."); | |
125 | else | |
126 | printk(KERN_INFO "virtual vector at 0x%08lx\n",(unsigned long)ramvec); | |
127 | ||
128 | /* create redirect table */ | |
129 | ramvec_p = ramvec; | |
130 | trap_entry = h8300_trap_table; | |
131 | saved_vector = h8300_saved_vectors; | |
132 | for ( i = 0; i < NR_IRQS; i++) { | |
133 | if (i == *saved_vector) { | |
134 | ramvec_p++; | |
135 | saved_vector++; | |
136 | } else { | |
137 | if ( i < NR_TRAPS ) { | |
138 | if (*trap_entry) | |
139 | *ramvec_p = VECTOR(*trap_entry); | |
140 | ramvec_p++; | |
141 | trap_entry++; | |
142 | } else | |
143 | *ramvec_p++ = REDIRECT(interrupt_entry); | |
144 | } | |
145 | } | |
146 | interrupt_redirect_table = ramvec; | |
147 | #ifdef DEBUG | |
148 | ramvec_p = ramvec; | |
149 | for (i = 0; i < NR_IRQS; i++) { | |
150 | if ((i % 8) == 0) | |
151 | printk(KERN_DEBUG "\n%p: ",ramvec_p); | |
152 | printk(KERN_DEBUG "%p ",*ramvec_p); | |
153 | ramvec_p++; | |
154 | } | |
155 | printk(KERN_DEBUG "\n"); | |
156 | #endif | |
157 | } | |
158 | #else | |
159 | #define setup_vector() do { } while(0) | |
160 | #endif | |
161 | ||
162 | void __init init_IRQ(void) | |
163 | { | |
164 | int c; | |
165 | ||
166 | setup_vector(); | |
167 | ||
168 | for (c = 0; c < NR_IRQS; c++) { | |
169 | irq_desc[c].status = IRQ_DISABLED; | |
170 | irq_desc[c].action = NULL; | |
171 | irq_desc[c].depth = 1; | |
172 | irq_desc[c].chip = &h8300irq_chip; | |
173 | } | |
174 | } | |
175 | ||
176 | asmlinkage void do_IRQ(int irq) | |
177 | { | |
178 | irq_enter(); | |
179 | __do_IRQ(irq); | |
180 | irq_exit(); | |
181 | } | |
182 | ||
183 | #if defined(CONFIG_PROC_FS) | |
184 | int show_interrupts(struct seq_file *p, void *v) | |
185 | { | |
186 | int i = *(loff_t *) v, j; | |
187 | struct irqaction * action; | |
188 | unsigned long flags; | |
189 | ||
190 | if (i == 0) | |
191 | seq_puts(p, " CPU0"); | |
192 | ||
193 | if (i < NR_IRQS) { | |
194 | spin_lock_irqsave(&irq_desc[i].lock, flags); | |
195 | action = irq_desc[i].action; | |
196 | if (!action) | |
197 | goto unlock; | |
198 | seq_printf(p, "%3d: ",i); | |
199 | seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]); | |
200 | seq_printf(p, " %14s", irq_desc[i].chip->name); | |
201 | seq_printf(p, "-%-8s", irq_desc[i].name); | |
202 | seq_printf(p, " %s", action->name); | |
203 | ||
204 | for (action=action->next; action; action = action->next) | |
205 | seq_printf(p, ", %s", action->name); | |
206 | seq_putc(p, '\n'); | |
207 | unlock: | |
208 | spin_unlock_irqrestore(&irq_desc[i].lock, flags); | |
209 | } | |
210 | return 0; | |
211 | } | |
212 | #endif |