1 files changed, 135 insertions, 0 deletions
diff --git a/arch/mn10300/unit-asb2303/include/unit/timex.h b/arch/mn10300/unit-asb2303/include/unit/timex.h
new file mode 100644
index 00000000000..f206b63c95b
--- /dev/null
+++ b/arch/mn10300/unit-asb2303/include/unit/timex.h
@@ -0,0 +1,135 @@
+/* ASB2303-specific timer specifcations
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+#ifndef _ASM_UNIT_TIMEX_H
+#define _ASM_UNIT_TIMEX_H
+
+#ifndef __ASSEMBLY__
+#include <linux/irq.h>
+#endif /* __ASSEMBLY__ */
+
+#include <asm/timer-regs.h>
+#include <unit/clock.h>
+
+/*
+ * jiffies counter specifications
+ */
+
+#define	TMJCBR_MAX		0xffff
+#define	TMJCBC			TM01BC
+
+#define	TMJCMD			TM01MD
+#define	TMJCBR			TM01BR
+#define	TMJCIRQ			TM1IRQ
+#define	TMJCICR			TM1ICR
+#define	TMJCICR_LEVEL		GxICR_LEVEL_5
+
+#ifndef __ASSEMBLY__
+
+static inline void startup_jiffies_counter(void)
+{
+	unsigned rate;
+	u16 md, t16;
+
+	/* use as little prescaling as possible to avoid losing accuracy */
+	md = TM0MD_SRC_IOCLK;
+	rate = MN10300_JCCLK / HZ;
+
+	if (rate > TMJCBR_MAX) {
+		md = TM0MD_SRC_IOCLK_8;
+		rate = MN10300_JCCLK / 8 / HZ;
+
+		if (rate > TMJCBR_MAX) {
+			md = TM0MD_SRC_IOCLK_32;
+			rate = MN10300_JCCLK / 32 / HZ;
+
+			if (rate > TMJCBR_MAX)
+				BUG();
+		}
+	}
+
+	TMJCBR = rate - 1;
+	t16 = TMJCBR;
+
+	TMJCMD =
+		md |
+		TM1MD_SRC_TM0CASCADE << 8 |
+		TM0MD_INIT_COUNTER |
+		TM1MD_INIT_COUNTER << 8;
+
+	TMJCMD =
+		md |
+		TM1MD_SRC_TM0CASCADE << 8 |
+		TM0MD_COUNT_ENABLE |
+		TM1MD_COUNT_ENABLE << 8;
+
+	t16 = TMJCMD;
+
+	TMJCICR |= GxICR_ENABLE | GxICR_DETECT | GxICR_REQUEST;
+	t16 = TMJCICR;
+}
+
+static inline void shutdown_jiffies_counter(void)
+{
+}
+
+#endif /* !__ASSEMBLY__ */
+
+
+/*
+ * timestamp counter specifications
+ */
+
+#define	TMTSCBR_MAX		0xffffffff
+#define	TMTSCBC			TM45BC
+
+#ifndef __ASSEMBLY__
+
+static inline void startup_timestamp_counter(void)
+{
+	/* set up timer 4 & 5 cascaded as a 32-bit counter to count real time
+	 * - count down from 4Gig-1 to 0 and wrap at IOCLK rate
+	 */
+	TM45BR = TMTSCBR_MAX;
+
+	TM4MD = TM4MD_SRC_IOCLK;
+	TM4MD |= TM4MD_INIT_COUNTER;
+	TM4MD &= ~TM4MD_INIT_COUNTER;
+	TM4ICR = 0;
+
+	TM5MD = TM5MD_SRC_TM4CASCADE;
+	TM5MD |= TM5MD_INIT_COUNTER;
+	TM5MD &= ~TM5MD_INIT_COUNTER;
+	TM5ICR = 0;
+
+	TM5MD |= TM5MD_COUNT_ENABLE;
+	TM4MD |= TM4MD_COUNT_ENABLE;
+}
+
+static inline void shutdown_timestamp_counter(void)
+{
+	TM4MD = 0;
+	TM5MD = 0;
+}
+
+/*
+ * we use a cascaded pair of 16-bit down-counting timers to count I/O
+ * clock cycles for the purposes of time keeping
+ */
+typedef unsigned long cycles_t;
+
+static inline cycles_t read_timestamp_counter(void)
+{
+	return (cycles_t)TMTSCBC;
+}
+
+#endif /* !__ASSEMBLY__ */
+
+#endif /* _ASM_UNIT_TIMEX_H */