patch-2.3.99-pre4 linux/include/asm-arm/arch-ebsa110/system.h

• Lines: 33
• Date: Mon Mar 27 10:46:29 2000
• Orig file: v2.3.99-pre3/linux/include/asm-arm/arch-ebsa110/system.h
• Orig date: Sun Mar 19 18:35:31 2000

diff -u --recursive --new-file v2.3.99-pre3/linux/include/asm-arm/arch-ebsa110/system.h linux/include/asm-arm/arch-ebsa110/system.h
@@ -6,7 +6,31 @@
 #ifndef __ASM_ARCH_SYSTEM_H
 #define __ASM_ARCH_SYSTEM_H
 
-#define arch_do_idle()		cpu_do_idle()
+/*
+ * This machine must never stop it MCLK.  However, if we are
+ * idle for a long time, slow the processor clock to MCLK.
+ */
+extern __inline__ void arch_idle(void)
+{
+	unsigned long start_idle;
+
+	start_idle = jiffies;
+
+	do {
+		if (current->need_resched || hlt_counter)
+			goto slow_out;
+	} while (time_before(start_idle, jiffies + HZ/3));
+
+	cpu_do_idle(IDLE_CLOCK_SLOW);
+
+	while (!current->need_resched && !hlt_counter) {
+		/* do nothing slowly */
+	}
+
+	cpu_do_idle(IDLE_CLOCK_FAST);
+slow_out:
+}
+
 #define arch_power_off()	do { } while (0)
 #define arch_reset(mode)	cpu_reset(0x80000000)