From 99d59c1a67d80029f97b784ac8a92d4dcda20837 Mon Sep 17 00:00:00 2001
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
Date: Fri, 21 Mar 2003 02:27:39 -0800
Subject: [PATCH] [PATCH] no arch specific headers for upd4990a

---
 include/linux/upd4990a.h | 140 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 140 insertions(+)
 create mode 100644 include/linux/upd4990a.h

diff --git a/include/linux/upd4990a.h b/include/linux/upd4990a.h
new file mode 100644
index 0000000000000..ad5063490808e
--- /dev/null
+++ b/include/linux/upd4990a.h
@@ -0,0 +1,140 @@
+/*
+ *  Constant and architecture independent procedures
+ *  for NEC uPD4990A serial I/O real-time clock.
+ *
+ *  Copyright 2001  TAKAI Kousuke <tak@kmc.kyoto-u.ac.jp>
+ *		    Kyoto University Microcomputer Club (KMC).
+ *
+ *  References:
+ *	uPD4990A serial I/O real-time clock users' manual (Japanese)
+ *	No. S12828JJ4V0UM00 (4th revision), NEC Corporation, 1999.
+ */
+
+#ifndef _LINUX_uPD4990A_H
+#define _LINUX_uPD4990A_H
+
+#include <asm/byteorder.h>
+
+#include <asm/upd4990a.h>
+
+/* Serial commands (4 bits) */
+#define UPD4990A_REGISTER_HOLD			(0x0)
+#define UPD4990A_REGISTER_SHIFT			(0x1)
+#define UPD4990A_TIME_SET_AND_COUNTER_HOLD	(0x2)
+#define UPD4990A_TIME_READ			(0x3)
+#define UPD4990A_TP_64HZ			(0x4)
+#define UPD4990A_TP_256HZ			(0x5)
+#define UPD4990A_TP_2048HZ			(0x6)
+#define UPD4990A_TP_4096HZ			(0x7)
+#define UPD4990A_TP_1S				(0x8)
+#define UPD4990A_TP_10S				(0x9)
+#define UPD4990A_TP_30S				(0xA)
+#define UPD4990A_TP_60S				(0xB)
+#define UPD4990A_INTERRUPT_RESET		(0xC)
+#define UPD4990A_INTERRUPT_TIMER_START		(0xD)
+#define UPD4990A_INTERRUPT_TIMER_STOP		(0xE)
+#define UPD4990A_TEST_MODE_SET			(0xF)
+
+/* Parallel commands (3 bits)
+   0-6 are same with serial commands.  */
+#define UPD4990A_PAR_SERIAL_MODE		7
+
+#ifndef UPD4990A_DELAY
+# include <linux/delay.h>
+# define UPD4990A_DELAY(usec)	udelay((usec))
+#endif
+#ifndef UPD4990A_OUTPUT_DATA
+# define UPD4990A_OUTPUT_DATA(bit)			\
+	do {						\
+		UPD4990A_OUTPUT_DATA_CLK((bit), 0);	\
+		UPD4990A_DELAY(1); /* t-DSU */		\
+		UPD4990A_OUTPUT_DATA_CLK((bit), 1);	\
+		UPD4990A_DELAY(1); /* t-DHLD */	\
+	} while (0)
+#endif
+
+static __inline__ void upd4990a_serial_command(int command)
+{
+	UPD4990A_OUTPUT_DATA(command >> 0);
+	UPD4990A_OUTPUT_DATA(command >> 1);
+	UPD4990A_OUTPUT_DATA(command >> 2);
+	UPD4990A_OUTPUT_DATA(command >> 3);
+	UPD4990A_DELAY(1);	/* t-HLD */
+	UPD4990A_OUTPUT_STROBE(1);
+	UPD4990A_DELAY(1);	/* t-STB & t-d1 */
+	UPD4990A_OUTPUT_STROBE(0);
+	/* 19 microseconds extra delay is needed
+	   iff previous mode is TIME READ command  */
+}
+
+struct upd4990a_raw_data {
+	u8	sec;		/* BCD */
+	u8	min;		/* BCD */
+	u8	hour;		/* BCD */
+	u8	mday;		/* BCD */
+#if   defined __LITTLE_ENDIAN_BITFIELD
+	unsigned wday :4;	/* 0-6 */
+	unsigned mon :4;	/* 1-based */
+#elif defined __BIG_ENDIAN_BITFIELD
+	unsigned mon :4;	/* 1-based */
+	unsigned wday :4;	/* 0-6 */
+#else
+# error Unknown bitfield endian!
+#endif
+	u8	year;		/* BCD */
+};
+
+static __inline__ void upd4990a_get_time(struct upd4990a_raw_data *buf,
+					  int leave_register_hold)
+{
+	int byte;
+
+	upd4990a_serial_command(UPD4990A_TIME_READ);
+	upd4990a_serial_command(UPD4990A_REGISTER_SHIFT);
+	UPD4990A_DELAY(19);	/* t-d2 - t-d1 */
+
+	for (byte = 0; byte < 6; byte++) {
+		u8 tmp;
+		int bit;
+
+		for (tmp = 0, bit = 0; bit < 8; bit++) {
+			tmp = (tmp | (UPD4990A_READ_DATA() << 8)) >> 1;
+			UPD4990A_OUTPUT_CLK(1);
+			UPD4990A_DELAY(1);
+			UPD4990A_OUTPUT_CLK(0);
+			UPD4990A_DELAY(1);
+		}
+		((u8 *) buf)[byte] = tmp;
+	}
+
+	/* The uPD4990A users' manual says that we should issue `Register
+	   Hold' command after each data retrieval, or next `Time Read'
+	   command may not work correctly.  */
+	if (!leave_register_hold)
+		upd4990a_serial_command(UPD4990A_REGISTER_HOLD);
+}
+
+static __inline__ void upd4990a_set_time(const struct upd4990a_raw_data *data,
+					  int time_set_only)
+{
+	int byte;
+
+	if (!time_set_only)
+		upd4990a_serial_command(UPD4990A_REGISTER_SHIFT);
+
+	for (byte = 0; byte < 6; byte++) {
+		int bit;
+		u8 tmp = ((const u8 *) data)[byte];
+
+		for (bit = 0; bit < 8; bit++, tmp >>= 1)
+			UPD4990A_OUTPUT_DATA(tmp);
+	}
+
+	upd4990a_serial_command(UPD4990A_TIME_SET_AND_COUNTER_HOLD);
+
+	/* Release counter hold and start the clock.  */
+	if (!time_set_only)
+		upd4990a_serial_command(UPD4990A_REGISTER_HOLD);
+}
+
+#endif /* _LINUX_uPD4990A_H */
-- 
2.53.0