Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 | /*
* linux/arch/h8300/platform/h8300h/ints.c
*
* Yoshinori Sato <ysato@users.sourceforge.jp>
*
* Based on linux/arch/$(ARCH)/platform/$(PLATFORM)/ints.c
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive
* for more details.
*
* Copyright 1996 Roman Zippel
* Copyright 1999 D. Jeff Dionne <jeff@rt-control.com>
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/kernel_stat.h>
#include <linux/seq_file.h>
#include <linux/init.h>
#include <linux/random.h>
#include <linux/bootmem.h>
#include <linux/hardirq.h>
#include <asm/system.h>
#include <asm/irq.h>
#include <asm/traps.h>
#include <asm/io.h>
#include <asm/setup.h>
#include <asm/errno.h>
/*
* This structure has only 4 elements for speed reasons
*/
typedef struct irq_handler {
irqreturn_t (*handler)(int, void *, struct pt_regs *);
int flags;
int count;
void *dev_id;
const char *devname;
} irq_handler_t;
static irq_handler_t *irq_list[NR_IRQS];
static int use_kmalloc;
extern unsigned long *interrupt_redirect_table;
extern const int h8300_saved_vectors[];
extern const unsigned long h8300_trap_table[];
int h8300_enable_irq_pin(unsigned int irq);
void h8300_disable_irq_pin(unsigned int irq);
#define CPU_VECTOR ((unsigned long *)0x000000)
#define ADDR_MASK (0xffffff)
#if defined(CONFIG_RAMKERNEL)
static unsigned long __init *get_vector_address(void)
{
unsigned long *rom_vector = CPU_VECTOR;
unsigned long base,tmp;
int vec_no;
base = rom_vector[EXT_IRQ0] & ADDR_MASK;
/* check romvector format */
for (vec_no = EXT_IRQ1; vec_no <= EXT_IRQ0+EXT_IRQS; vec_no++) {
if ((base+(vec_no - EXT_IRQ0)*4) != (rom_vector[vec_no] & ADDR_MASK))
return NULL;
}
/* ramvector base address */
base -= EXT_IRQ0*4;
/* writerble check */
tmp = ~(*(volatile unsigned long *)base);
(*(volatile unsigned long *)base) = tmp;
if ((*(volatile unsigned long *)base) != tmp)
return NULL;
return (unsigned long *)base;
}
#endif
void __init init_IRQ(void)
{
#if defined(CONFIG_RAMKERNEL)
int i;
unsigned long *ramvec,*ramvec_p;
const unsigned long *trap_entry;
const int *saved_vector;
ramvec = get_vector_address();
if (ramvec == NULL)
panic("interrupt vector serup failed.");
else
printk(KERN_INFO "virtual vector at 0x%08lx\n",(unsigned long)ramvec);
/* create redirect table */
ramvec_p = ramvec;
trap_entry = h8300_trap_table;
saved_vector = h8300_saved_vectors;
for ( i = 0; i < NR_IRQS; i++) {
if (i == *saved_vector) {
ramvec_p++;
saved_vector++;
} else {
if ( i < NR_TRAPS ) {
if (*trap_entry)
*ramvec_p = VECTOR(*trap_entry);
ramvec_p++;
trap_entry++;
} else
*ramvec_p++ = REDIRECT(interrupt_entry);
}
}
interrupt_redirect_table = ramvec;
#ifdef DUMP_VECTOR
ramvec_p = ramvec;
for (i = 0; i < NR_IRQS; i++) {
if ((i % 8) == 0)
printk(KERN_DEBUG "\n%p: ",ramvec_p);
printk(KERN_DEBUG "%p ",*ramvec_p);
ramvec_p++;
}
printk(KERN_DEBUG "\n");
#endif
#endif
}
int request_irq(unsigned int irq,
irqreturn_t (*handler)(int, void *, struct pt_regs *),
unsigned long flags, const char *devname, void *dev_id)
{
irq_handler_t *irq_handle;
if (irq < 0 || irq >= NR_IRQS) {
printk(KERN_ERR "Incorrect IRQ %d from %s\n", irq, devname);
return -EINVAL;
}
if (irq_list[irq] || (h8300_enable_irq_pin(irq) == -EBUSY))
return -EBUSY;
if (use_kmalloc)
irq_handle = (irq_handler_t *)kmalloc(sizeof(irq_handler_t), GFP_ATOMIC);
else {
/* use bootmem allocater */
irq_handle = (irq_handler_t *)alloc_bootmem(sizeof(irq_handler_t));
irq_handle = (irq_handler_t *)((unsigned long)irq_handle | 0x80000000);
}
if (irq_handle == NULL)
return -ENOMEM;
irq_handle->handler = handler;
irq_handle->flags = flags;
irq_handle->count = 0;
irq_handle->dev_id = dev_id;
irq_handle->devname = devname;
irq_list[irq] = irq_handle;
if (irq_handle->flags & SA_SAMPLE_RANDOM)
rand_initialize_irq(irq);
enable_irq(irq);
return 0;
}
EXPORT_SYMBOL(request_irq);
void free_irq(unsigned int irq, void *dev_id)
{
if (irq >= NR_IRQS)
return;
if (!irq_list[irq] || irq_list[irq]->dev_id != dev_id)
printk(KERN_WARNING "Removing probably wrong IRQ %d from %s\n",
irq, irq_list[irq]->devname);
disable_irq(irq);
h8300_disable_irq_pin(irq);
if (((unsigned long)irq_list[irq] & 0x80000000) == 0) {
kfree(irq_list[irq]);
irq_list[irq] = NULL;
}
}
EXPORT_SYMBOL(free_irq);
/*
* Do we need these probe functions on the m68k?
*/
unsigned long probe_irq_on (void)
{
return 0;
}
EXPORT_SYMBOL(probe_irq_on);
int probe_irq_off (unsigned long irqs)
{
return 0;
}
EXPORT_SYMBOL(probe_irq_off);
void enable_irq(unsigned int irq)
{
if (irq >= EXT_IRQ0 && irq <= (EXT_IRQ0 + EXT_IRQS))
IER_REGS |= 1 << (irq - EXT_IRQ0);
}
void disable_irq(unsigned int irq)
{
if (irq >= EXT_IRQ0 && irq <= (EXT_IRQ0 + EXT_IRQS))
IER_REGS &= ~(1 << (irq - EXT_IRQ0));
}
asmlinkage void process_int(int irq, struct pt_regs *fp)
{
irq_enter();
h8300_clear_isr(irq);
if (irq >= NR_TRAPS && irq < NR_IRQS) {
if (irq_list[irq]) {
irq_list[irq]->handler(irq, irq_list[irq]->dev_id, fp);
irq_list[irq]->count++;
if (irq_list[irq]->flags & SA_SAMPLE_RANDOM)
add_interrupt_randomness(irq);
}
} else {
BUG();
}
irq_exit();
}
int show_interrupts(struct seq_file *p, void *v)
{
int i = *(loff_t *) v;
if ((i < NR_IRQS) && (irq_list[i]!=NULL)) {
seq_printf(p, "%3d: %10u ",i,irq_list[i]->count);
seq_printf(p, "%s\n", irq_list[i]->devname);
}
return 0;
}
void init_irq_proc(void)
{
}
static int __init enable_kmalloc(void)
{
use_kmalloc = 1;
return 0;
}
core_initcall(enable_kmalloc);
|