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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/m68k/kernel/ints.c
downloadconfigs-2.6.12-rc2.tar.gz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/m68k/kernel/ints.c')
-rw-r--r--arch/m68k/kernel/ints.c281
1 files changed, 281 insertions, 0 deletions
diff --git a/arch/m68k/kernel/ints.c b/arch/m68k/kernel/ints.c
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+/*
+ * 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/module.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] = {
+ [0] = "spurious int",
+ [1] = "int1 handler",
+ [2] = "int2 handler",
+ [3] = "int3 handler",
+ [4] = "int4 handler",
+ [5] = "int5 handler",
+ [6] = "int6 handler",
+ [7] = "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,
+ irqreturn_t (*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, irqreturn_t (*)(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 nodes\n");
+ 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,
+ irqreturn_t (*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);
+}
+
+EXPORT_SYMBOL(request_irq);
+
+void free_irq(unsigned int irq, void *dev_id)
+{
+ mach_free_irq(irq, dev_id);
+}
+
+EXPORT_SYMBOL(free_irq);
+
+int cpu_request_irq(unsigned int irq,
+ irqreturn_t (*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 %s\n",
+ __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 replaceable\n",
+ __FUNCTION__, irq, irq_list[irq].devname);
+ return -EBUSY;
+ }
+ if (!(flags & IRQ_FLG_REPLACE)) {
+ printk("%s: %s can't replace IRQ %d from %s\n",
+ __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 cpu_free_irq(unsigned int irq, void *dev_id)
+{
+ if (irq < IRQ1 || irq > IRQ7) {
+ printk("%s: Incorrect IRQ %d\n", __FUNCTION__, irq);
+ return;
+ }
+
+ if (irq_list[irq].dev_id != dev_id)
+ printk("%s: Removing probably wrong IRQ %d from %s\n",
+ __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;
+}
+
+EXPORT_SYMBOL(probe_irq_on);
+
+int probe_irq_off (unsigned long irqs)
+{
+#ifdef CONFIG_Q40
+ if (MACH_IS_Q40)
+ return q40_probe_irq_off(irqs);
+#endif
+ return 0;
+}
+
+EXPORT_SYMBOL(probe_irq_off);
+
+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,
+ irqreturn_t (*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_cpu(0).irqs[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 %ld\n", vec);
+ return;
+ }
+}
+
+int show_interrupts(struct seq_file *p, void *v)
+{
+ int i = *(loff_t *) v;
+
+ /* autovector interrupts */
+ if (i < SYS_IRQS) {
+ if (mach_default_handler) {
+ seq_printf(p, "auto %2d: %10u ", i,
+ i ? kstat_cpu(0).irqs[i] : num_spurious);
+ seq_puts(p, " ");
+ seq_printf(p, "%s\n", irq_list[i].devname);
+ }
+ } else if (i == SYS_IRQS)
+ mach_get_irq_list(p, v);
+ return 0;
+}
+
+void init_irq_proc(void)
+{
+ /* Insert /proc/irq driver here */
+}
+