ints.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:7k
- /*
- * linux/arch/m68k/kernel/ints.c -- Linux/m68k general interrupt handling code
- *
- * 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.
- *
- * 07/03/96: Timer initialization, and thus mach_sched_init(),
- * removed from request_irq() and moved to init_time().
- * We should therefore consider renaming our add_isr() and
- * remove_isr() to request_irq() and free_irq()
- * respectively, so they are compliant with the other
- * architectures. /Jes
- * 11/07/96: Changed all add_/remove_isr() to request_/free_irq() calls.
- * Removed irq list support, if any machine needs an irq server
- * it must implement this itself (as it's already done), instead
- * only default handler are used with mach_default_handler.
- * request_irq got some flags different from other architectures:
- * - IRQ_FLG_REPLACE : Replace an existing handler (the default one
- * can be replaced without this flag)
- * - IRQ_FLG_LOCK : handler can't be replaced
- * There are other machine depending flags, see there
- * If you want to replace a default handler you should know what
- * you're doing, since it might handle different other irq sources
- * which must be served /Roman Zippel
- */
- #include <linux/config.h>
- #include <linux/types.h>
- #include <linux/sched.h>
- #include <linux/kernel_stat.h>
- #include <linux/errno.h>
- #include <linux/init.h>
- #include <asm/setup.h>
- #include <asm/system.h>
- #include <asm/irq.h>
- #include <asm/traps.h>
- #include <asm/page.h>
- #include <asm/machdep.h>
- #ifdef CONFIG_Q40
- #include <asm/q40ints.h>
- #endif
- /* table for system interrupt handlers */
- static irq_handler_t irq_list[SYS_IRQS];
- static const char *default_names[SYS_IRQS] = {
- "spurious int", "int1 handler", "int2 handler", "int3 handler",
- "int4 handler", "int5 handler", "int6 handler", "int7 handler"
- };
- /* The number of spurious interrupts */
- volatile unsigned int num_spurious;
- #define NUM_IRQ_NODES 100
- static irq_node_t nodes[NUM_IRQ_NODES];
- static void dummy_enable_irq(unsigned int irq);
- static void dummy_disable_irq(unsigned int irq);
- static int dummy_request_irq(unsigned int irq,
- void (*handler) (int, void *, struct pt_regs *),
- unsigned long flags, const char *devname, void *dev_id);
- static void dummy_free_irq(unsigned int irq, void *dev_id);
- void (*enable_irq) (unsigned int) = dummy_enable_irq;
- void (*disable_irq) (unsigned int) = dummy_disable_irq;
- int (*mach_request_irq) (unsigned int, void (*)(int, void *, struct pt_regs *),
- unsigned long, const char *, void *) = dummy_request_irq;
- void (*mach_free_irq) (unsigned int, void *) = dummy_free_irq;
- void init_irq_proc(void);
- /*
- * void init_IRQ(void)
- *
- * Parameters: None
- *
- * Returns: Nothing
- *
- * This function should be called during kernel startup to initialize
- * the IRQ handling routines.
- */
- void __init init_IRQ(void)
- {
- int i;
- for (i = 0; i < SYS_IRQS; i++) {
- if (mach_default_handler)
- irq_list[i].handler = (*mach_default_handler)[i];
- irq_list[i].flags = 0;
- irq_list[i].dev_id = NULL;
- irq_list[i].devname = default_names[i];
- }
- for (i = 0; i < NUM_IRQ_NODES; i++)
- nodes[i].handler = NULL;
- mach_init_IRQ ();
- }
- irq_node_t *new_irq_node(void)
- {
- irq_node_t *node;
- short i;
- for (node = nodes, i = NUM_IRQ_NODES-1; i >= 0; node++, i--)
- if (!node->handler)
- return node;
- printk ("new_irq_node: out of nodesn");
- return NULL;
- }
- /*
- * We will keep these functions until I have convinced Linus to move
- * the declaration of them from include/linux/sched.h to
- * include/asm/irq.h.
- */
- int request_irq(unsigned int irq,
- void (*handler) (int, void *, struct pt_regs *),
- unsigned long flags, const char *devname, void *dev_id)
- {
- return mach_request_irq(irq, handler, flags, devname, dev_id);
- }
- void free_irq(unsigned int irq, void *dev_id)
- {
- mach_free_irq(irq, dev_id);
- }
- int sys_request_irq(unsigned int irq,
- void (*handler)(int, void *, struct pt_regs *),
- unsigned long flags, const char *devname, void *dev_id)
- {
- if (irq < IRQ1 || irq > IRQ7) {
- printk("%s: Incorrect IRQ %d from %sn",
- __FUNCTION__, irq, devname);
- return -ENXIO;
- }
- #if 0
- if (!(irq_list[irq].flags & IRQ_FLG_STD)) {
- if (irq_list[irq].flags & IRQ_FLG_LOCK) {
- printk("%s: IRQ %d from %s is not replaceablen",
- __FUNCTION__, irq, irq_list[irq].devname);
- return -EBUSY;
- }
- if (!(flags & IRQ_FLG_REPLACE)) {
- printk("%s: %s can't replace IRQ %d from %sn",
- __FUNCTION__, devname, irq, irq_list[irq].devname);
- return -EBUSY;
- }
- }
- #endif
- irq_list[irq].handler = handler;
- irq_list[irq].flags = flags;
- irq_list[irq].dev_id = dev_id;
- irq_list[irq].devname = devname;
- return 0;
- }
- void sys_free_irq(unsigned int irq, void *dev_id)
- {
- if (irq < IRQ1 || irq > IRQ7) {
- printk("%s: Incorrect IRQ %dn", __FUNCTION__, irq);
- return;
- }
- if (irq_list[irq].dev_id != dev_id)
- printk("%s: Removing probably wrong IRQ %d from %sn",
- __FUNCTION__, irq, irq_list[irq].devname);
- irq_list[irq].handler = (*mach_default_handler)[irq];
- irq_list[irq].flags = 0;
- irq_list[irq].dev_id = NULL;
- irq_list[irq].devname = default_names[irq];
- }
- /*
- * Do we need these probe functions on the m68k?
- *
- * ... may be useful with ISA devices
- */
- unsigned long probe_irq_on (void)
- {
- #ifdef CONFIG_Q40
- if (MACH_IS_Q40)
- return q40_probe_irq_on();
- #endif
- return 0;
- }
- int probe_irq_off (unsigned long irqs)
- {
- #ifdef CONFIG_Q40
- if (MACH_IS_Q40)
- return q40_probe_irq_off(irqs);
- #endif
- return 0;
- }
- static void dummy_enable_irq(unsigned int irq)
- {
- printk("calling uninitialized enable_irq()n");
- }
- static void dummy_disable_irq(unsigned int irq)
- {
- printk("calling uninitialized disable_irq()n");
- }
- static int dummy_request_irq(unsigned int irq,
- void (*handler) (int, void *, struct pt_regs *),
- unsigned long flags, const char *devname, void *dev_id)
- {
- printk("calling uninitialized request_irq()n");
- return 0;
- }
- static void dummy_free_irq(unsigned int irq, void *dev_id)
- {
- printk("calling uninitialized disable_irq()n");
- }
- asmlinkage void process_int(unsigned long vec, struct pt_regs *fp)
- {
- if (vec >= VEC_INT1 && vec <= VEC_INT7 && !MACH_IS_BVME6000) {
- vec -= VEC_SPUR;
- kstat.irqs[0][vec]++;
- irq_list[vec].handler(vec, irq_list[vec].dev_id, fp);
- } else {
- if (mach_process_int)
- mach_process_int(vec, fp);
- else
- panic("Can't process interrupt vector %ldn", vec);
- return;
- }
- }
- int get_irq_list(char *buf)
- {
- int i, len = 0;
- /* autovector interrupts */
- if (mach_default_handler) {
- for (i = 0; i < SYS_IRQS; i++) {
- len += sprintf(buf+len, "auto %2d: %10u ", i,
- i ? kstat.irqs[0][i] : num_spurious);
- len += sprintf(buf+len, " ");
- len += sprintf(buf+len, "%sn", irq_list[i].devname);
- }
- }
- len += mach_get_irq_list(buf+len);
- return len;
- }
- void init_irq_proc(void)
- {
- /* Insert /proc/irq driver here */
- }