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-rw-r--r--arch/m68knommu/platform/68328/ints.c285
1 files changed, 285 insertions, 0 deletions
diff --git a/arch/m68knommu/platform/68328/ints.c b/arch/m68knommu/platform/68328/ints.c
new file mode 100644
index 00000000000..7437217813d
--- /dev/null
+++ b/arch/m68knommu/platform/68328/ints.c
@@ -0,0 +1,285 @@
+/*
+ * linux/arch/m68knommu/platform/68328/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/errno.h>
+
+#include <asm/system.h>
+#include <asm/irq.h>
+#include <asm/traps.h>
+#include <asm/io.h>
+#include <asm/machdep.h>
+#include <asm/setup.h>
+
+#if defined(CONFIG_M68328)
+#include <asm/MC68328.h>
+#elif defined(CONFIG_M68EZ328)
+#include <asm/MC68EZ328.h>
+#elif defined(CONFIG_M68VZ328)
+#include <asm/MC68VZ328.h>
+#endif
+
+/* assembler routines */
+asmlinkage void system_call(void);
+asmlinkage void buserr(void);
+asmlinkage void trap(void);
+asmlinkage void trap3(void);
+asmlinkage void trap4(void);
+asmlinkage void trap5(void);
+asmlinkage void trap6(void);
+asmlinkage void trap7(void);
+asmlinkage void trap8(void);
+asmlinkage void trap9(void);
+asmlinkage void trap10(void);
+asmlinkage void trap11(void);
+asmlinkage void trap12(void);
+asmlinkage void trap13(void);
+asmlinkage void trap14(void);
+asmlinkage void trap15(void);
+asmlinkage void trap33(void);
+asmlinkage void trap34(void);
+asmlinkage void trap35(void);
+asmlinkage void trap36(void);
+asmlinkage void trap37(void);
+asmlinkage void trap38(void);
+asmlinkage void trap39(void);
+asmlinkage void trap40(void);
+asmlinkage void trap41(void);
+asmlinkage void trap42(void);
+asmlinkage void trap43(void);
+asmlinkage void trap44(void);
+asmlinkage void trap45(void);
+asmlinkage void trap46(void);
+asmlinkage void trap47(void);
+asmlinkage irqreturn_t bad_interrupt(int, void *, struct pt_regs *);
+asmlinkage irqreturn_t inthandler(void);
+asmlinkage irqreturn_t inthandler1(void);
+asmlinkage irqreturn_t inthandler2(void);
+asmlinkage irqreturn_t inthandler3(void);
+asmlinkage irqreturn_t inthandler4(void);
+asmlinkage irqreturn_t inthandler5(void);
+asmlinkage irqreturn_t inthandler6(void);
+asmlinkage irqreturn_t inthandler7(void);
+
+extern e_vector *_ramvec;
+
+/* The number of spurious interrupts */
+volatile unsigned int num_spurious;
+unsigned int local_irq_count[NR_CPUS];
+
+/* irq node variables for the 32 (potential) on chip sources */
+static irq_node_t int_irq_list[NR_IRQS];
+
+#if !defined(CONFIG_DRAGEN2)
+asm (".global _start, __ramend/n/t"
+ ".section .romvec/n"
+ "e_vectors:\n\t"
+ ".long __ramend-4, _start, buserr, trap, trap, trap, trap, trap\n\t"
+ ".long trap, trap, trap, trap, trap, trap, trap, trap\n\t"
+ ".long trap, trap, trap, trap, trap, trap, trap, trap\n\t"
+ ".long trap, trap, trap, trap\n\t"
+ ".long trap, trap, trap, trap\n\t"
+ /*.long inthandler, inthandler, inthandler, inthandler
+ .long inthandler4, inthandler, inthandler, inthandler */
+ /* TRAP #0-15 */
+ ".long system_call, trap, trap, trap, trap, trap, trap, trap\n\t"
+ ".long trap, trap, trap, trap, trap, trap, trap, trap\n\t"
+ ".long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0\n\t"
+ ".text\n"
+ "ignore: rte");
+#endif
+
+/*
+ * This function should be called during kernel startup to initialize
+ * the IRQ handling routines.
+ */
+void init_IRQ(void)
+{
+ int i;
+
+ /* set up the vectors */
+ for (i = 72; i < 256; ++i)
+ _ramvec[i] = (e_vector) bad_interrupt;
+
+ _ramvec[32] = system_call;
+
+ _ramvec[65] = (e_vector) inthandler1;
+ _ramvec[66] = (e_vector) inthandler2;
+ _ramvec[67] = (e_vector) inthandler3;
+ _ramvec[68] = (e_vector) inthandler4;
+ _ramvec[69] = (e_vector) inthandler5;
+ _ramvec[70] = (e_vector) inthandler6;
+ _ramvec[71] = (e_vector) inthandler7;
+
+ IVR = 0x40; /* Set DragonBall IVR (interrupt base) to 64 */
+
+ /* initialize handlers */
+ for (i = 0; i < NR_IRQS; i++) {
+ int_irq_list[i].handler = bad_interrupt;
+ int_irq_list[i].flags = IRQ_FLG_STD;
+ int_irq_list[i].dev_id = NULL;
+ int_irq_list[i].devname = NULL;
+ }
+
+ /* turn off all interrupts */
+ IMR = ~0;
+}
+
+int request_irq(
+ unsigned int irq,
+ irqreturn_t (*handler)(int, void *, struct pt_regs *),
+ unsigned long flags,
+ const char *devname,
+ void *dev_id)
+{
+ if (irq >= NR_IRQS) {
+ printk (KERN_ERR "%s: Unknown IRQ %d from %s\n", __FUNCTION__, irq, devname);
+ return -ENXIO;
+ }
+
+ if (!(int_irq_list[irq].flags & IRQ_FLG_STD)) {
+ if (int_irq_list[irq].flags & IRQ_FLG_LOCK) {
+ printk(KERN_ERR "%s: IRQ %d from %s is not replaceable\n",
+ __FUNCTION__, irq, int_irq_list[irq].devname);
+ return -EBUSY;
+ }
+ if (flags & IRQ_FLG_REPLACE) {
+ printk(KERN_ERR "%s: %s can't replace IRQ %d from %s\n",
+ __FUNCTION__, devname, irq, int_irq_list[irq].devname);
+ return -EBUSY;
+ }
+ }
+
+ int_irq_list[irq].handler = handler;
+ int_irq_list[irq].flags = flags;
+ int_irq_list[irq].dev_id = dev_id;
+ int_irq_list[irq].devname = devname;
+
+ IMR &= ~(1<<irq);
+
+ return 0;
+}
+
+EXPORT_SYMBOL(request_irq);
+
+void free_irq(unsigned int irq, void *dev_id)
+{
+ if (irq >= NR_IRQS) {
+ printk (KERN_ERR "%s: Unknown IRQ %d\n", __FUNCTION__, irq);
+ return;
+ }
+
+ if (int_irq_list[irq].dev_id != dev_id)
+ printk(KERN_INFO "%s: removing probably wrong IRQ %d from %s\n",
+ __FUNCTION__, irq, int_irq_list[irq].devname);
+
+ int_irq_list[irq].handler = bad_interrupt;
+ int_irq_list[irq].flags = IRQ_FLG_STD;
+ int_irq_list[irq].dev_id = NULL;
+ int_irq_list[irq].devname = NULL;
+
+ IMR |= 1<<irq;
+}
+
+EXPORT_SYMBOL(free_irq);
+
+int show_interrupts(struct seq_file *p, void *v)
+{
+ int i = *(loff_t *) v;
+
+ if (i < NR_IRQS) {
+ if (int_irq_list[i].devname) {
+ seq_printf(p, "%3d: %10u ", i, kstat_cpu(0).irqs[i]);
+ if (int_irq_list[i].flags & IRQ_FLG_LOCK)
+ seq_printf(p, "L ");
+ else
+ seq_printf(p, " ");
+ seq_printf(p, "%s\n", int_irq_list[i].devname);
+ }
+ }
+ if (i == NR_IRQS)
+ seq_printf(p, " : %10u spurious\n", num_spurious);
+
+ return 0;
+}
+
+/* The 68k family did not have a good way to determine the source
+ * of interrupts until later in the family. The EC000 core does
+ * not provide the vector number on the stack, we vector everything
+ * into one vector and look in the blasted mask register...
+ * This code is designed to be fast, almost constant time, not clean!
+ */
+void process_int(int vec, struct pt_regs *fp)
+{
+ int irq;
+ int mask;
+
+ unsigned long pend = ISR;
+
+ while (pend) {
+ if (pend & 0x0000ffff) {
+ if (pend & 0x000000ff) {
+ if (pend & 0x0000000f) {
+ mask = 0x00000001;
+ irq = 0;
+ } else {
+ mask = 0x00000010;
+ irq = 4;
+ }
+ } else {
+ if (pend & 0x00000f00) {
+ mask = 0x00000100;
+ irq = 8;
+ } else {
+ mask = 0x00001000;
+ irq = 12;
+ }
+ }
+ } else {
+ if (pend & 0x00ff0000) {
+ if (pend & 0x000f0000) {
+ mask = 0x00010000;
+ irq = 16;
+ } else {
+ mask = 0x00100000;
+ irq = 20;
+ }
+ } else {
+ if (pend & 0x0f000000) {
+ mask = 0x01000000;
+ irq = 24;
+ } else {
+ mask = 0x10000000;
+ irq = 28;
+ }
+ }
+ }
+
+ while (! (mask & pend)) {
+ mask <<=1;
+ irq++;
+ }
+
+ kstat_cpu(0).irqs[irq]++;
+
+ if (int_irq_list[irq].handler) {
+ int_irq_list[irq].handler(irq, int_irq_list[irq].dev_id, fp);
+ } else {
+ printk(KERN_ERR "unregistered interrupt %d!\nTurning it off in the IMR...\n", irq);
+ IMR |= mask;
+ }
+ pend &= ~mask;
+ }
+}
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