ptp: Added a clock driver for the IXP46x.

This patch adds a driver for the hardware time stamping unit found on the
IXP465. The basic clock operations and an external trigger are implemented.

Signed-off-by: Richard Cochran <richard.cochran@omicron.at>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: David S. Miller <davem@davemloft.net>
Acked-by: John Stultz <john.stultz@linaro.org>
Acked-by: Krzysztof Halasa <khc@pm.waw.pl>
Signed-off-by: John Stultz <john.stultz@linaro.org>

1 files changed, 78 insertions, 0 deletions

diff --git a/arch/arm/mach-ixp4xx/include/mach/ixp46x_ts.h b/arch/arm/mach-ixp4xx/include/mach/ixp46x_ts.h
new file mode 100644
index 000000000000..292d55ed2113
--- /dev/null
+++ b/arch/arm/mach-ixp4xx/include/mach/ixp46x_ts.h
@@ -0,0 +1,78 @@
+/*
+ * PTP 1588 clock using the IXP46X
+ *
+ * Copyright (C) 2010 OMICRON electronics GmbH
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef _IXP46X_TS_H_
+#define _IXP46X_TS_H_
+
+#define DEFAULT_ADDEND 0xF0000029
+#define TICKS_NS_SHIFT 4
+
+struct ixp46x_channel_ctl {
+        u32 ch_control;  /* 0x40 Time Synchronization Channel Control */
+        u32 ch_event;    /* 0x44 Time Synchronization Channel Event */
+        u32 tx_snap_lo;  /* 0x48 Transmit Snapshot Low Register */
+        u32 tx_snap_hi;  /* 0x4C Transmit Snapshot High Register */
+        u32 rx_snap_lo;  /* 0x50 Receive Snapshot Low Register */
+        u32 rx_snap_hi;  /* 0x54 Receive Snapshot High Register */
+        u32 src_uuid_lo; /* 0x58 Source UUID0 Low Register */
+        u32 src_uuid_hi; /* 0x5C Sequence Identifier/Source UUID0 High */
+};
+
+struct ixp46x_ts_regs {
+        u32 control;     /* 0x00 Time Sync Control Register */
+        u32 event;       /* 0x04 Time Sync Event Register */
+        u32 addend;      /* 0x08 Time Sync Addend Register */
+        u32 accum;       /* 0x0C Time Sync Accumulator Register */
+        u32 test;        /* 0x10 Time Sync Test Register */
+        u32 unused;      /* 0x14 */
+        u32 rsystime_lo; /* 0x18 RawSystemTime_Low Register */
+        u32 rsystime_hi; /* 0x1C RawSystemTime_High Register */
+        u32 systime_lo;  /* 0x20 SystemTime_Low Register */
+        u32 systime_hi;  /* 0x24 SystemTime_High Register */
+        u32 trgt_lo;     /* 0x28 TargetTime_Low Register */
+        u32 trgt_hi;     /* 0x2C TargetTime_High Register */
+        u32 asms_lo;     /* 0x30 Auxiliary Slave Mode Snapshot Low  */
+        u32 asms_hi;     /* 0x34 Auxiliary Slave Mode Snapshot High */
+        u32 amms_lo;     /* 0x38 Auxiliary Master Mode Snapshot Low */
+        u32 amms_hi;     /* 0x3C Auxiliary Master Mode Snapshot High */
+
+        struct ixp46x_channel_ctl channel[3];
+};
+
+/* 0x00 Time Sync Control Register Bits */
+#define TSCR_AMM (1<<3)
+#define TSCR_ASM (1<<2)
+#define TSCR_TTM (1<<1)
+#define TSCR_RST (1<<0)
+
+/* 0x04 Time Sync Event Register Bits */
+#define TSER_SNM (1<<3)
+#define TSER_SNS (1<<2)
+#define TTIPEND  (1<<1)
+
+/* 0x40 Time Synchronization Channel Control Register Bits */
+#define MASTER_MODE   (1<<0)
+#define TIMESTAMP_ALL (1<<1)
+
+/* 0x44 Time Synchronization Channel Event Register Bits */
+#define TX_SNAPSHOT_LOCKED (1<<0)
+#define RX_SNAPSHOT_LOCKED (1<<1)
+
+#endif