patch-2.4.10 linux/arch/mips64/mips-boards/atlas/atlas_int.c
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- Lines: 250
- Date:
Sun Sep 9 10:43:02 2001
- Orig file:
v2.4.9/linux/arch/mips64/mips-boards/atlas/atlas_int.c
- Orig date:
Wed Dec 31 16:00:00 1969
diff -u --recursive --new-file v2.4.9/linux/arch/mips64/mips-boards/atlas/atlas_int.c linux/arch/mips64/mips-boards/atlas/atlas_int.c
@@ -0,0 +1,249 @@
+/*
+ * Carsten Langgaard, carstenl@mips.com
+ * Copyright (C) 2000 MIPS Technologies, Inc. All rights reserved.
+ *
+ * ########################################################################
+ *
+ * This program is free software; you can distribute it and/or modify it
+ * under the terms of the GNU General Public License (Version 2) as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
+ *
+ * ########################################################################
+ *
+ * Routines for generic manipulation of the interrupts found on the MIPS
+ * Atlas board.
+ *
+ */
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/kernel_stat.h>
+
+#include <asm/irq.h>
+#include <asm/mips-boards/atlas.h>
+#include <asm/mips-boards/atlasint.h>
+#ifdef CONFIG_REMOTE_DEBUG
+#include <asm/gdb-stub.h>
+#endif
+
+struct atlas_ictrl_regs *atlas_hw0_icregs
+ = (struct atlas_ictrl_regs *)ATLAS_ICTRL_REGS_BASE;
+
+extern asmlinkage void mipsIRQ(void);
+extern void do_IRQ(int irq, struct pt_regs *regs);
+
+unsigned long spurious_count = 0;
+irq_desc_t irq_desc[NR_IRQS];
+
+#if 0
+#define DEBUG_INT(x...) printk(x)
+#else
+#define DEBUG_INT(x...)
+#endif
+
+void disable_atlas_irq(unsigned int irq_nr)
+{
+ atlas_hw0_icregs->intrsten = (1 << irq_nr);
+}
+
+void enable_atlas_irq(unsigned int irq_nr)
+{
+ atlas_hw0_icregs->intseten = (1 << irq_nr);
+}
+
+static unsigned int startup_atlas_irq(unsigned int irq)
+{
+ enable_atlas_irq(irq);
+ return 0; /* never anything pending */
+}
+
+#define shutdown_atlas_irq disable_atlas_irq
+
+#define mask_and_ack_atlas_irq disable_atlas_irq
+
+static void end_atlas_irq(unsigned int irq)
+{
+ if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
+ enable_atlas_irq(irq);
+}
+
+static struct hw_interrupt_type atlas_irq_type = {
+ "Atlas",
+ startup_atlas_irq,
+ shutdown_atlas_irq,
+ enable_atlas_irq,
+ disable_atlas_irq,
+ mask_and_ack_atlas_irq,
+ end_atlas_irq,
+ NULL
+};
+
+int get_irq_list(char *buf)
+{
+ int i, len = 0;
+ int num = 0;
+ struct irqaction *action;
+
+ for (i = 0; i < ATLASINT_END; i++, num++) {
+ action = irq_desc[i].action;
+ if (!action)
+ continue;
+ len += sprintf(buf+len, "%2d: %8d %c %s",
+ num, kstat.irqs[0][num],
+ (action->flags & SA_INTERRUPT) ? '+' : ' ',
+ action->name);
+ for (action=action->next; action; action = action->next) {
+ len += sprintf(buf+len, ",%s %s",
+ (action->flags & SA_INTERRUPT) ? " +" : "",
+ action->name);
+ }
+ len += sprintf(buf+len, " [hw0]\n");
+ }
+ return len;
+}
+
+int request_irq(unsigned int irq,
+ void (*handler)(int, void *, struct pt_regs *),
+ unsigned long irqflags,
+ const char * devname,
+ void *dev_id)
+{
+ struct irqaction *action;
+
+ DEBUG_INT("request_irq: irq=%d, devname = %s\n", irq, devname);
+
+ if (irq >= ATLASINT_END)
+ return -EINVAL;
+ if (!handler)
+ return -EINVAL;
+
+ action = (struct irqaction *)kmalloc(sizeof(struct irqaction), GFP_KERNEL);
+ if(!action)
+ return -ENOMEM;
+
+ action->handler = handler;
+ action->flags = irqflags;
+ action->mask = 0;
+ action->name = devname;
+ action->dev_id = dev_id;
+ action->next = 0;
+ irq_desc[irq].action = action;
+ enable_atlas_irq(irq);
+
+ return 0;
+}
+
+void free_irq(unsigned int irq, void *dev_id)
+{
+ struct irqaction *action;
+
+ if (irq >= ATLASINT_END) {
+ printk("Trying to free IRQ%d\n",irq);
+ return;
+ }
+
+ action = irq_desc[irq].action;
+ irq_desc[irq].action = NULL;
+ disable_atlas_irq(irq);
+ kfree(action);
+}
+
+static inline int ls1bit32(unsigned int x)
+{
+ int b = 31, s;
+
+ s = 16; if (x << 16 == 0) s = 0; b -= s; x <<= s;
+ s = 8; if (x << 8 == 0) s = 0; b -= s; x <<= s;
+ s = 4; if (x << 4 == 0) s = 0; b -= s; x <<= s;
+ s = 2; if (x << 2 == 0) s = 0; b -= s; x <<= s;
+ s = 1; if (x << 1 == 0) s = 0; b -= s;
+
+ return b;
+}
+
+void atlas_hw0_irqdispatch(struct pt_regs *regs)
+{
+ struct irqaction *action;
+ unsigned long int_status;
+ int irq, cpu = smp_processor_id();
+
+ int_status = atlas_hw0_icregs->intstatus;
+
+ /* if int_status == 0, then the interrupt has already been cleared */
+ if (int_status == 0)
+ return;
+
+ irq = ls1bit32(int_status);
+ action = irq_desc[irq].action;
+
+ DEBUG_INT("atlas_hw0_irqdispatch: irq=%d\n", irq);
+
+ /* if action == NULL, then we don't have a handler for the irq */
+ if ( action == NULL ) {
+ printk("No handler for hw0 irq: %i\n", irq);
+ spurious_count++;
+ return;
+ }
+
+ irq_enter(cpu, irq);
+ kstat.irqs[0][irq]++;
+ action->handler(irq, action->dev_id, regs);
+ irq_exit(cpu, irq);
+
+ return;
+}
+
+unsigned long probe_irq_on (void)
+{
+ return 0;
+}
+
+
+int probe_irq_off (unsigned long irqs)
+{
+ return 0;
+}
+
+#ifdef CONFIG_REMOTE_DEBUG
+extern void breakpoint(void);
+extern int remote_debug;
+#endif
+
+void __init init_IRQ(void)
+{
+ int i;
+
+ /*
+ * Mask out all interrupt by writing "1" to all bit position in
+ * the interrupt reset reg.
+ */
+ atlas_hw0_icregs->intrsten = 0xffffffff;
+
+ /* Now safe to set the exception vector. */
+ set_except_vector(0, mipsIRQ);
+
+ for (i = 0; i <= ATLASINT_END; i++) {
+ irq_desc[i].status = IRQ_DISABLED;
+ irq_desc[i].action = 0;
+ irq_desc[i].depth = 1;
+ irq_desc[i].handler = &atlas_irq_type;
+ }
+
+#ifdef CONFIG_REMOTE_DEBUG
+ if (remote_debug) {
+ set_debug_traps();
+ breakpoint();
+ }
+#endif
+}
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