[PPC] Fix cpm_dpram_addr returning phys mem instead of virt mem
[linux/fpc-iii.git] / arch / h8300 / kernel / irq.c
blob43d21e93f41ff734eff4805399765232f9c723d6
1 /*
2 * linux/arch/h8300/kernel/irq.c
4 * Copyright 2007 Yoshinori Sato <ysato@users.sourceforge.jp>
5 */
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>
18 #include <asm/system.h>
19 #include <asm/traps.h>
20 #include <asm/io.h>
21 #include <asm/setup.h>
22 #include <asm/errno.h>
24 /*#define DEBUG*/
26 extern unsigned long *interrupt_redirect_table;
27 extern const int h8300_saved_vectors[];
28 extern const unsigned long h8300_trap_table[];
29 int h8300_enable_irq_pin(unsigned int irq);
30 void h8300_disable_irq_pin(unsigned int irq);
32 #define CPU_VECTOR ((unsigned long *)0x000000)
33 #define ADDR_MASK (0xffffff)
35 static inline int is_ext_irq(unsigned int irq)
37 return (irq >= EXT_IRQ0 && irq <= (EXT_IRQ0 + EXT_IRQS));
40 static void h8300_enable_irq(unsigned int irq)
42 if (is_ext_irq(irq))
43 IER_REGS |= 1 << (irq - EXT_IRQ0);
46 static void h8300_disable_irq(unsigned int irq)
48 if (is_ext_irq(irq))
49 IER_REGS &= ~(1 << (irq - EXT_IRQ0));
52 static void h8300_end_irq(unsigned int irq)
56 static unsigned int h8300_startup_irq(unsigned int irq)
58 if (is_ext_irq(irq))
59 return h8300_enable_irq_pin(irq);
60 else
61 return 0;
64 static void h8300_shutdown_irq(unsigned int irq)
66 if (is_ext_irq(irq))
67 h8300_disable_irq_pin(irq);
71 * h8300 interrupt controler implementation
73 struct irq_chip h8300irq_chip = {
74 .name = "H8300-INTC",
75 .startup = h8300_startup_irq,
76 .shutdown = h8300_shutdown_irq,
77 .enable = h8300_enable_irq,
78 .disable = h8300_disable_irq,
79 .ack = NULL,
80 .end = h8300_end_irq,
83 void ack_bad_irq(unsigned int irq)
85 printk("unexpected IRQ trap at vector %02x\n", irq);
88 #if defined(CONFIG_RAMKERNEL)
89 static unsigned long __init *get_vector_address(void)
91 unsigned long *rom_vector = CPU_VECTOR;
92 unsigned long base,tmp;
93 int vec_no;
95 base = rom_vector[EXT_IRQ0] & ADDR_MASK;
97 /* check romvector format */
98 for (vec_no = EXT_IRQ1; vec_no <= EXT_IRQ0+EXT_IRQS; vec_no++) {
99 if ((base+(vec_no - EXT_IRQ0)*4) != (rom_vector[vec_no] & ADDR_MASK))
100 return NULL;
103 /* ramvector base address */
104 base -= EXT_IRQ0*4;
106 /* writerble check */
107 tmp = ~(*(volatile unsigned long *)base);
108 (*(volatile unsigned long *)base) = tmp;
109 if ((*(volatile unsigned long *)base) != tmp)
110 return NULL;
111 return (unsigned long *)base;
114 static void __init setup_vector(void)
116 int i;
117 unsigned long *ramvec,*ramvec_p;
118 const unsigned long *trap_entry;
119 const int *saved_vector;
121 ramvec = get_vector_address();
122 if (ramvec == NULL)
123 panic("interrupt vector serup failed.");
124 else
125 printk(KERN_INFO "virtual vector at 0x%08lx\n",(unsigned long)ramvec);
127 /* create redirect table */
128 ramvec_p = ramvec;
129 trap_entry = h8300_trap_table;
130 saved_vector = h8300_saved_vectors;
131 for ( i = 0; i < NR_IRQS; i++) {
132 if (i == *saved_vector) {
133 ramvec_p++;
134 saved_vector++;
135 } else {
136 if ( i < NR_TRAPS ) {
137 if (*trap_entry)
138 *ramvec_p = VECTOR(*trap_entry);
139 ramvec_p++;
140 trap_entry++;
141 } else
142 *ramvec_p++ = REDIRECT(interrupt_entry);
145 interrupt_redirect_table = ramvec;
146 #ifdef DEBUG
147 ramvec_p = ramvec;
148 for (i = 0; i < NR_IRQS; i++) {
149 if ((i % 8) == 0)
150 printk(KERN_DEBUG "\n%p: ",ramvec_p);
151 printk(KERN_DEBUG "%p ",*ramvec_p);
152 ramvec_p++;
154 printk(KERN_DEBUG "\n");
155 #endif
157 #else
158 #define setup_vector() do { } while(0)
159 #endif
161 void __init init_IRQ(void)
163 int c;
165 setup_vector();
167 for (c = 0; c < NR_IRQS; c++) {
168 irq_desc[c].status = IRQ_DISABLED;
169 irq_desc[c].action = NULL;
170 irq_desc[c].depth = 1;
171 irq_desc[c].chip = &h8300irq_chip;
175 asmlinkage void do_IRQ(int irq)
177 irq_enter();
178 __do_IRQ(irq);
179 irq_exit();
182 #if defined(CONFIG_PROC_FS)
183 int show_interrupts(struct seq_file *p, void *v)
185 int i = *(loff_t *) v, j;
186 struct irqaction * action;
187 unsigned long flags;
189 if (i == 0)
190 seq_puts(p, " CPU0");
192 if (i < NR_IRQS) {
193 spin_lock_irqsave(&irq_desc[i].lock, flags);
194 action = irq_desc[i].action;
195 if (!action)
196 goto unlock;
197 seq_printf(p, "%3d: ",i);
198 seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
199 seq_printf(p, " %14s", irq_desc[i].chip->name);
200 seq_printf(p, "-%-8s", irq_desc[i].name);
201 seq_printf(p, " %s", action->name);
203 for (action=action->next; action; action = action->next)
204 seq_printf(p, ", %s", action->name);
205 seq_putc(p, '\n');
206 unlock:
207 spin_unlock_irqrestore(&irq_desc[i].lock, flags);
209 return 0;
211 #endif