1

/*******************************************************************************

     2

     3

  Intel PRO/1000 Linux driver

     4

  Copyright(c) 1999 - 2013 Intel Corporation.

     5

     6

  This program is free software; you can redistribute it and/or modify it

     7

  under the terms and conditions of the GNU General Public License,

     8

  version 2, as published by the Free Software Foundation.

     9

    10

  This program is distributed in the hope it will be useful, but WITHOUT

    11

  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    12

  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for

    13

  more details.

    14

    15

  You should have received a copy of the GNU General Public License along with

    16

  this program; if not, write to the Free Software Foundation, Inc.,

    17

  51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.

    18

    19

  The full GNU General Public License is included in this distribution in

    20

  the file called "COPYING".

    21

    22

  Contact Information:

    23

  Linux NICS <linux.nics@intel.com>

    24

  e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>

    25

  Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497

    26

    27

*******************************************************************************/

    28

    29

/* PTP 1588 Hardware Clock (PHC)

    30

 * Derived from PTP Hardware Clock driver for Intel 82576 and 82580 (igb)

    31

 * Copyright (C) 2011 Richard Cochran <richardcochran@gmail.com>

    32

 */

    33

    34

#include "e1000-3.14-ethercat.h"

    35

    36

/**

    37

 * e1000e_phc_adjfreq - adjust the frequency of the hardware clock

    38

 * @ptp: ptp clock structure

    39

 * @delta: Desired frequency change in parts per billion

    40

 *

    41

 * Adjust the frequency of the PHC cycle counter by the indicated delta from

    42

 * the base frequency.

    43

 **/

    44

static int e1000e_phc_adjfreq(struct ptp_clock_info *ptp, s32 delta)

    45

{

    46

	struct e1000_adapter *adapter = container_of(ptp, struct e1000_adapter,

    47

						     ptp_clock_info);

    48

	struct e1000_hw *hw = &adapter->hw;

    49

	bool neg_adj = false;

    50

	u64 adjustment;

    51

	u32 timinca, incvalue;

    52

	s32 ret_val;

    53

    54

	if ((delta > ptp->max_adj) || (delta <= -1000000000))

    55

		return -EINVAL;

    56

    57

	if (delta < 0) {

    58

		neg_adj = true;

    59

		delta = -delta;

    60

	}

    61

    62

	/* Get the System Time Register SYSTIM base frequency */

    63

	ret_val = e1000e_get_base_timinca(adapter, &timinca);

    64

	if (ret_val)

    65

		return ret_val;

    66

    67

	incvalue = timinca & E1000_TIMINCA_INCVALUE_MASK;

    68

    69

	adjustment = incvalue;

    70

	adjustment *= delta;

    71

	adjustment = div_u64(adjustment, 1000000000);

    72

    73

	incvalue = neg_adj ? (incvalue - adjustment) : (incvalue + adjustment);

    74

    75

	timinca &= ~E1000_TIMINCA_INCVALUE_MASK;

    76

	timinca |= incvalue;

    77

    78

	ew32(TIMINCA, timinca);

    79

    80

	return 0;

    81

}

    82

    83

/**

    84

 * e1000e_phc_adjtime - Shift the time of the hardware clock

    85

 * @ptp: ptp clock structure

    86

 * @delta: Desired change in nanoseconds

    87

 *

    88

 * Adjust the timer by resetting the timecounter structure.

    89

 **/

    90

static int e1000e_phc_adjtime(struct ptp_clock_info *ptp, s64 delta)

    91

{

    92

	struct e1000_adapter *adapter = container_of(ptp, struct e1000_adapter,

    93

						     ptp_clock_info);

    94

	unsigned long flags;

    95

	s64 now;

    96

    97

	spin_lock_irqsave(&adapter->systim_lock, flags);

    98

	now = timecounter_read(&adapter->tc);

    99

	now += delta;

   100

	timecounter_init(&adapter->tc, &adapter->cc, now);

   101

	spin_unlock_irqrestore(&adapter->systim_lock, flags);

   102

   103

	return 0;

   104

}

   105

   106

/**

   107

 * e1000e_phc_gettime - Reads the current time from the hardware clock

   108

 * @ptp: ptp clock structure

   109

 * @ts: timespec structure to hold the current time value

   110

 *

   111

 * Read the timecounter and return the correct value in ns after converting

   112

 * it into a struct timespec.

   113

 **/

   114

static int e1000e_phc_gettime(struct ptp_clock_info *ptp, struct timespec *ts)

   115

{

   116

	struct e1000_adapter *adapter = container_of(ptp, struct e1000_adapter,

   117

						     ptp_clock_info);

   118

	unsigned long flags;

   119

	u32 remainder;

   120

	u64 ns;

   121

   122

	spin_lock_irqsave(&adapter->systim_lock, flags);

   123

	ns = timecounter_read(&adapter->tc);

   124

	spin_unlock_irqrestore(&adapter->systim_lock, flags);

   125

   126

	ts->tv_sec = div_u64_rem(ns, NSEC_PER_SEC, &remainder);

   127

	ts->tv_nsec = remainder;

   128

   129

	return 0;

   130

}

   131

   132

/**

   133

 * e1000e_phc_settime - Set the current time on the hardware clock

   134

 * @ptp: ptp clock structure

   135

 * @ts: timespec containing the new time for the cycle counter

   136

 *

   137

 * Reset the timecounter to use a new base value instead of the kernel

   138

 * wall timer value.

   139

 **/

   140

static int e1000e_phc_settime(struct ptp_clock_info *ptp,

   141

			      const struct timespec *ts)

   142

{

   143

	struct e1000_adapter *adapter = container_of(ptp, struct e1000_adapter,

   144

						     ptp_clock_info);

   145

	unsigned long flags;

   146

	u64 ns;

   147

   148

	ns = timespec_to_ns(ts);

   149

   150

	/* reset the timecounter */

   151

	spin_lock_irqsave(&adapter->systim_lock, flags);

   152

	timecounter_init(&adapter->tc, &adapter->cc, ns);

   153

	spin_unlock_irqrestore(&adapter->systim_lock, flags);

   154

   155

	return 0;

   156

}

   157

   158

/**

   159

 * e1000e_phc_enable - enable or disable an ancillary feature

   160

 * @ptp: ptp clock structure

   161

 * @request: Desired resource to enable or disable

   162

 * @on: Caller passes one to enable or zero to disable

   163

 *

   164

 * Enable (or disable) ancillary features of the PHC subsystem.

   165

 * Currently, no ancillary features are supported.

   166

 **/

   167

static int e1000e_phc_enable(struct ptp_clock_info __always_unused *ptp,

   168

			     struct ptp_clock_request __always_unused *request,

   169

			     int __always_unused on)

   170

{

   171

	return -EOPNOTSUPP;

   172

}

   173

   174

static void e1000e_systim_overflow_work(struct work_struct *work)

   175

{

   176

	struct e1000_adapter *adapter = container_of(work, struct e1000_adapter,

   177

						     systim_overflow_work.work);

   178

	struct e1000_hw *hw = &adapter->hw;

   179

	struct timespec ts;

   180

   181

	adapter->ptp_clock_info.gettime(&adapter->ptp_clock_info, &ts);

   182

   183

	e_dbg("SYSTIM overflow check at %ld.%09lu\n", ts.tv_sec, ts.tv_nsec);

   184

   185

	schedule_delayed_work(&adapter->systim_overflow_work,

   186

			      E1000_SYSTIM_OVERFLOW_PERIOD);

   187

}

   188

   189

static const struct ptp_clock_info e1000e_ptp_clock_info = {

   190

	.owner		= THIS_MODULE,

   191

	.n_alarm	= 0,

   192

	.n_ext_ts	= 0,

   193

	.n_per_out	= 0,

   194

	.pps		= 0,

   195

	.adjfreq	= e1000e_phc_adjfreq,

   196

	.adjtime	= e1000e_phc_adjtime,

   197

	.gettime	= e1000e_phc_gettime,

   198

	.settime	= e1000e_phc_settime,

   199

	.enable		= e1000e_phc_enable,

   200

};

   201

   202

/**

   203

 * e1000e_ptp_init - initialize PTP for devices which support it

   204

 * @adapter: board private structure

   205

 *

   206

 * This function performs the required steps for enabling PTP support.

   207

 * If PTP support has already been loaded it simply calls the cyclecounter

   208

 * init routine and exits.

   209

 **/

   210

void e1000e_ptp_init(struct e1000_adapter *adapter)

   211

{

   212

	struct e1000_hw *hw = &adapter->hw;

   213

   214

	adapter->ptp_clock = NULL;

   215

   216

	if (!(adapter->flags & FLAG_HAS_HW_TIMESTAMP))

   217

		return;

   218

   219

	adapter->ptp_clock_info = e1000e_ptp_clock_info;

   220

   221

	snprintf(adapter->ptp_clock_info.name,

   222

		 sizeof(adapter->ptp_clock_info.name), "%pm",

   223

		 adapter->netdev->perm_addr);

   224

   225

	switch (hw->mac.type) {

   226

	case e1000_pch2lan:

   227

	case e1000_pch_lpt:

   228

		if ((hw->mac.type != e1000_pch_lpt) ||

   229

		    (er32(TSYNCRXCTL) & E1000_TSYNCRXCTL_SYSCFI)) {

   230

			adapter->ptp_clock_info.max_adj = 24000000 - 1;

   231

			break;

   232

		}

   233

		/* fall-through */

   234

	case e1000_82574:

   235

	case e1000_82583:

   236

		adapter->ptp_clock_info.max_adj = 600000000 - 1;

   237

		break;

   238

	default:

   239

		break;

   240

	}

   241

   242

	INIT_DELAYED_WORK(&adapter->systim_overflow_work,

   243

			  e1000e_systim_overflow_work);

   244

   245

	schedule_delayed_work(&adapter->systim_overflow_work,

   246

			      E1000_SYSTIM_OVERFLOW_PERIOD);

   247

   248

	adapter->ptp_clock = ptp_clock_register(&adapter->ptp_clock_info,

   249

						&adapter->pdev->dev);

   250

	if (IS_ERR(adapter->ptp_clock)) {

   251

		adapter->ptp_clock = NULL;

   252

		e_err("ptp_clock_register failed\n");

   253

	} else {

   254

		e_info("registered PHC clock\n");

   255

	}

   256

}

   257

   258

/**

   259

 * e1000e_ptp_remove - disable PTP device and stop the overflow check

   260

 * @adapter: board private structure

   261

 *

   262

 * Stop the PTP support, and cancel the delayed work.

   263

 **/

   264

void e1000e_ptp_remove(struct e1000_adapter *adapter)

   265

{

   266

	if (!(adapter->flags & FLAG_HAS_HW_TIMESTAMP))

   267

		return;

   268

   269

	cancel_delayed_work_sync(&adapter->systim_overflow_work);

   270

   271

	if (adapter->ptp_clock) {

   272

		ptp_clock_unregister(adapter->ptp_clock);

   273

		adapter->ptp_clock = NULL;

   274

		e_info("removed PHC\n");

   275

	}

   276

}