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Diffstat (limited to 'include/asm-arm/arch-l7200/time.h')
-rw-r--r--include/asm-arm/arch-l7200/time.h72
1 files changed, 72 insertions, 0 deletions
diff --git a/include/asm-arm/arch-l7200/time.h b/include/asm-arm/arch-l7200/time.h
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index 00000000000..7b98b533e63
--- /dev/null
+++ b/include/asm-arm/arch-l7200/time.h
@@ -0,0 +1,72 @@
+/*
+ * linux/include/asm-arm/arch-l7200/time.h
+ *
+ * Copyright (C) 2000 Rob Scott (rscott@mtrob.fdns.net)
+ * Steve Hill (sjhill@cotw.com)
+ *
+ * Changelog:
+ * 01-02-2000 RS Created l7200 version, derived from rpc code
+ * 05-03-2000 SJH Complete rewrite
+ */
+#ifndef _ASM_ARCH_TIME_H
+#define _ASM_ARCH_TIME_H
+
+#include <asm/arch/irqs.h>
+
+/*
+ * RTC base register address
+ */
+#define RTC_BASE (IO_BASE_2 + 0x2000)
+
+/*
+ * RTC registers
+ */
+#define RTC_RTCDR (*(volatile unsigned char *) (RTC_BASE + 0x000))
+#define RTC_RTCMR (*(volatile unsigned char *) (RTC_BASE + 0x004))
+#define RTC_RTCS (*(volatile unsigned char *) (RTC_BASE + 0x008))
+#define RTC_RTCC (*(volatile unsigned char *) (RTC_BASE + 0x008))
+#define RTC_RTCDV (*(volatile unsigned char *) (RTC_BASE + 0x00c))
+#define RTC_RTCCR (*(volatile unsigned char *) (RTC_BASE + 0x010))
+
+/*
+ * RTCCR register values
+ */
+#define RTC_RATE_32 0x00 /* 32 Hz tick */
+#define RTC_RATE_64 0x10 /* 64 Hz tick */
+#define RTC_RATE_128 0x20 /* 128 Hz tick */
+#define RTC_RATE_256 0x30 /* 256 Hz tick */
+#define RTC_EN_ALARM 0x01 /* Enable alarm */
+#define RTC_EN_TIC 0x04 /* Enable counter */
+#define RTC_EN_STWDOG 0x08 /* Enable watchdog */
+
+/*
+ * Handler for RTC timer interrupt
+ */
+static irqreturn_t
+timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+ do_timer(regs);
+#ifndef CONFIG_SMP
+ update_process_times(user_mode(regs));
+#endif
+ do_profile(regs);
+ RTC_RTCC = 0; /* Clear interrupt */
+
+ return IRQ_HANDLED;
+}
+
+/*
+ * Set up RTC timer interrupt, and return the current time in seconds.
+ */
+void __init time_init(void)
+{
+ RTC_RTCC = 0; /* Clear interrupt */
+
+ timer_irq.handler = timer_interrupt;
+
+ setup_irq(IRQ_RTC_TICK, &timer_irq);
+
+ RTC_RTCCR = RTC_RATE_128 | RTC_EN_TIC; /* Set rate and enable timer */
+}
+
+#endif