patch-2.4.0-test3 linux/arch/mips/cobalt/via.c

• Lines: 91
• Date: Sun Jul 9 22:18:15 2000
• Orig file: v2.4.0-test2/linux/arch/mips/cobalt/via.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.0-test2/linux/arch/mips/cobalt/via.c linux/arch/mips/cobalt/via.c
@@ -0,0 +1,90 @@
+/*
+ * Interrupt handling for the VIA ISA bridge.
+ *
+ * Everything the same ... just different ...
+ */
+#include <linux/kernel.h>
+#include <asm/cobalt.h>
+#include <asm/ptrace.h>
+#include <asm/io.h>
+
+extern asmlinkage void do_IRQ(int irq, struct pt_regs * regs);
+
+extern unsigned char cache_21;
+extern unsigned char cache_A1;
+
+/*
+ * (un)mask_irq, disable_irq() and enable_irq() only handle (E)ISA and
+ * PCI devices.  Other onboard hardware needs specific routines.
+ */
+void mask_irq(unsigned int irq_nr)
+{
+	unsigned char mask;
+
+	mask = 1 << (irq_nr & 7);
+	if (irq_nr < 8) {
+		cache_21 |= mask;
+		outb(cache_21, 0x10000021);
+	} else {
+		cache_A1 |= mask;
+		outb(cache_A1, 0x100000a1);
+	}
+}
+
+void unmask_irq(unsigned int irq_nr)
+{
+	unsigned char mask;
+
+	mask = ~(1 << (irq_nr & 7));
+	if (irq_nr < 8) {
+		cache_21 &= mask;
+		outb(cache_21, 0x10000021);
+	} else {
+		cache_A1 &= mask;
+		outb(cache_A1, 0x100000a1);
+	}
+}
+
+asmlinkage void via_irq(struct pt_regs *regs)
+{
+	char mstat, sstat;
+  
+	/* Read Master Status */
+	VIA_PORT_WRITE(0x20, 0x0C);
+	mstat = VIA_PORT_READ(0x20);
+ 
+	if (mstat < 0) {
+		mstat &= 0x7f;
+		if (mstat != 2) {     	
+			do_IRQ(mstat, regs);
+			VIA_PORT_WRITE(0x20, mstat | 0x20);
+		} else {
+			sstat = VIA_PORT_READ(0xA0);
+
+			/* Slave interrupt */
+			VIA_PORT_WRITE(0xA0, 0x0C);
+			sstat = VIA_PORT_READ(0xA0);
+   
+			if (sstat < 0) {
+				do_IRQ((sstat + 8) & 0x7f, regs);
+				VIA_PORT_WRITE(0x20, 0x22);       
+				VIA_PORT_WRITE(0xA0, (sstat & 0x7f) | 0x20);
+			} else {
+				printk("Spurious slave interrupt...\n");
+			}
+		}
+	} else
+		printk("Spurious master interrupt...");
+}
+
+asmlinkage void galileo_irq(struct pt_regs *regs)
+{
+	unsigned long irq_src = *((unsigned long *) 0xb4000c18); 
+  
+	/* Check for timer irq ... */
+	if (irq_src & 0x00000100) {
+		*((volatile unsigned long *) 0xb4000c18) = 0;
+		do_IRQ(0, regs);
+	} else
+		printk("Spurious Galileo interrupt...\n");
+}