stmmac: add IEEE PTPv1 and PTPv2 support.

This patch enhances the stmmac driver to support IEEE 1588-2002
PTP (Precision Time Protocol) version 1 and IEEE 1588-2008 PPT
version 2.

Precision Time Protocol(PTP),which enables precise synchronization
of clocks in measurement and control systems implemented with
technologies such as network communication,local computing,
& distributed objects.

Both PTPv1 and PTPv2 is selected at run-time using the HW capability
register.

The PTPv1 TimeStamp support can be used on chips that have the normal
descriptor structures and PTPv2 TimeStamp support can be used on chips
that have the Extended descriptors(DES4-5-6-7). All such sanity checks
are done and verified by using HW capability register.

V2: in this version the ethtool support has been included in this patch;
Koptions have been completely removed (previously added to select
PTP and PTPv2). PTPv1 and PTPv2 is now added in a single patch instead of
two patches.
get_timestamp() and get_systemtime() L/H have been combined into single APIs.

Signed-off-by: Rayagond Kokatanur <rayagond@vayavyalabs.com>
Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Cc: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 74 insertions, 0 deletions

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.h b/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.h
new file mode 100644
index 000000000000..3dbc047622fa
--- /dev/null
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.h
@@ -0,0 +1,74 @@
+/******************************************************************************
+  PTP Header file
+
+  Copyright (C) 2013  Vayavya Labs Pvt Ltd
+
+  This program is free software; you can redistribute it and/or modify it
+  under the terms and conditions of the GNU General Public License,
+  version 2, as published by the Free Software Foundation.
+
+  This program is distributed in the hope 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.,
+  51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+
+  The full GNU General Public License is included in this distribution in
+  the file called "COPYING".
+
+  Author: Rayagond Kokatanur <rayagond@vayavyalabs.com>
+******************************************************************************/
+
+#ifndef __STMMAC_PTP_H__
+#define __STMMAC_PTP_H__
+
+#define STMMAC_SYSCLOCK 62500000
+
+/* IEEE 1588 PTP register offsets */
+#define PTP_TCR         0x0700  /* Timestamp Control Reg */
+#define PTP_SSIR        0x0704  /* Sub-Second Increment Reg */
+#define PTP_STSR        0x0708  /* System Time – Seconds Regr */
+#define PTP_STNSR       0x070C  /* System Time – Nanoseconds Reg */
+#define PTP_STSUR       0x0710  /* System Time – Seconds Update Reg */
+#define PTP_STNSUR      0x0714  /* System Time – Nanoseconds Update Reg */
+#define PTP_TAR         0x0718  /* Timestamp Addend Reg */
+#define PTP_TTSR        0x071C  /* Target Time Seconds Reg */
+#define PTP_TTNSR       0x0720  /* Target Time Nanoseconds Reg */
+#define PTP_STHWSR      0x0724  /* System Time - Higher Word Seconds Reg */
+#define PTP_TSR         0x0728  /* Timestamp Status */
+
+#define PTP_STNSUR_ADDSUB_SHIFT 31
+
+/* PTP TCR defines */
+#define PTP_TCR_TSENA           0x00000001 /* Timestamp Enable */
+#define PTP_TCR_TSCFUPDT        0x00000002 /* Timestamp Fine/Coarse Update */
+#define PTP_TCR_TSINIT          0x00000004 /* Timestamp Initialize */
+#define PTP_TCR_TSUPDT          0x00000008 /* Timestamp Update */
+/* Timestamp Interrupt Trigger Enable */
+#define PTP_TCR_TSTRIG          0x00000010
+#define PTP_TCR_TSADDREG        0x00000020 /* Addend Reg Update */
+#define PTP_TCR_TSENALL         0x00000100 /* Enable Timestamp for All Frames */
+/* Timestamp Digital or Binary Rollover Control */
+#define PTP_TCR_TSCTRLSSR       0x00000200
+
+/* Enable PTP packet Processing for Version 2 Format */
+#define PTP_TCR_TSVER2ENA       0x00000400
+/* Enable Processing of PTP over Ethernet Frames */
+#define PTP_TCR_TSIPENA         0x00000800
+/* Enable Processing of PTP Frames Sent over IPv6-UDP */
+#define PTP_TCR_TSIPV6ENA       0x00001000
+/* Enable Processing of PTP Frames Sent over IPv4-UDP */
+#define PTP_TCR_TSIPV4ENA       0x00002000
+/* Enable Timestamp Snapshot for Event Messages */
+#define PTP_TCR_TSEVNTENA       0x00004000
+/* Enable Snapshot for Messages Relevant to Master */
+#define PTP_TCR_TSMSTRENA       0x00008000
+/* Select PTP packets for Taking Snapshots */
+#define PTP_TCR_SNAPTYPSEL_1    0x00010000
+/* Enable MAC address for PTP Frame Filtering */
+#define PTP_TCR_TSENMACADDR     0x00040000
+
+#endif /* __STMMAC_PTP_H__ */