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

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 *

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 *  $Id$

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 *

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 *  Copyright (C) 2006-2014  Florian Pose, Ingenieurgemeinschaft IgH

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 *

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 *  This file is part of the IgH EtherCAT Master.

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 *

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 *  The IgH EtherCAT Master is free software; you can redistribute it and/or

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 *  modify it under the terms of the GNU General Public License version 2, as

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 *  published by the Free Software Foundation.

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 *

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 *  The IgH EtherCAT Master is distributed in the hope that it will be useful,

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 *  but WITHOUT ANY WARRANTY; without even the implied warranty of

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 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General

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 *  Public License for more details.

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 *

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

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 *  with the IgH EtherCAT Master; if not, write to the Free Software

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

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 *

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 *  ---

    23

 *

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 *  The license mentioned above concerns the source code only. Using the

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 *  EtherCAT technology and brand is only permitted in compliance with the

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 *  industrial property and similar rights of Beckhoff Automation GmbH.

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 *

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 *  vim: noexpandtab

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 *

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

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/**

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   \file

    34

   EtherCAT driver for RTL8139-compatible NICs.

    35

*/

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    37

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

    38

    39

/*

    40

  Former documentation:

    41

    42

	8139too.c: A RealTek RTL-8139 Fast Ethernet driver for Linux.

    43

    44

	Maintained by Jeff Garzik <jgarzik@pobox.com>

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	Copyright 2000-2002 Jeff Garzik

    46

    47

	Much code comes from Donald Becker's rtl8139.c driver,

    48

	versions 1.13 and older.  This driver was originally based

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	on rtl8139.c version 1.07.  Header of rtl8139.c version 1.13:

    50

    51

	-----<snip>-----

    52

    53

        	Written 1997-2001 by Donald Becker.

    54

		This software may be used and distributed according to the

    55

		terms of the GNU General Public License (GPL), incorporated

    56

		herein by reference.  Drivers based on or derived from this

    57

		code fall under the GPL and must retain the authorship,

    58

		copyright and license notice.  This file is not a complete

    59

		program and may only be used when the entire operating

    60

		system is licensed under the GPL.

    61

    62

		This driver is for boards based on the RTL8129 and RTL8139

    63

		PCI ethernet chips.

    64

    65

		The author may be reached as becker@scyld.com, or C/O Scyld

    66

		Computing Corporation 410 Severn Ave., Suite 210 Annapolis

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		MD 21403

    68

    69

		Support and updates available at

    70

		http://www.scyld.com/network/rtl8139.html

    71

    72

		Twister-tuning table provided by Kinston

    73

		<shangh@realtek.com.tw>.

    74

    75

	-----<snip>-----

    76

    77

	This software may be used and distributed according to the terms

    78

	of the GNU General Public License, incorporated herein by reference.

    79

    80

	Contributors:

    81

    82

		Donald Becker - he wrote the original driver, kudos to him!

    83

		(but please don't e-mail him for support, this isn't his driver)

    84

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		Tigran Aivazian - bug fixes, skbuff free cleanup

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    87

		Martin Mares - suggestions for PCI cleanup

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    89

		David S. Miller - PCI DMA and softnet updates

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    91

		Ernst Gill - fixes ported from BSD driver

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    93

		Daniel Kobras - identified specific locations of

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			posted MMIO write bugginess

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    96

		Gerard Sharp - bug fix, testing and feedback

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    98

		David Ford - Rx ring wrap fix

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   100

		Dan DeMaggio - swapped RTL8139 cards with me, and allowed me

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		to find and fix a crucial bug on older chipsets.

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   103

		Donald Becker/Chris Butterworth/Marcus Westergren -

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		Noticed various Rx packet size-related buglets.

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   106

		Santiago Garcia Mantinan - testing and feedback

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   108

		Jens David - 2.2.x kernel backports

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   110

		Martin Dennett - incredibly helpful insight on undocumented

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		features of the 8139 chips

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   113

		Jean-Jacques Michel - bug fix

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		Tobias Ringström - Rx interrupt status checking suggestion

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		Andrew Morton - Clear blocked signals, avoid

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		buffer overrun setting current->comm.

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		Kalle Olavi Niemitalo - Wake-on-LAN ioctls

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   122

		Robert Kuebel - Save kernel thread from dying on any signal.

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   124

	Submitting bug reports:

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   126

		"rtl8139-diag -mmmaaavvveefN" output

   127

		enable RTL8139_DEBUG below, and look at 'dmesg' or kernel log

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   129

*/

   130

   131

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

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   133

#define DRV_NAME	"ec_8139too"

   134

#define DRV_VERSION	"0.9.28"

   135

   136

   137

#include <linux/module.h>

   138

#include <linux/kernel.h>

   139

#include <linux/compiler.h>

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#include <linux/pci.h>

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#include <linux/init.h>

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#include <linux/interrupt.h>

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#include <linux/netdevice.h>

   144

#include <linux/etherdevice.h>

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#include <linux/rtnetlink.h>

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#include <linux/delay.h>

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#include <linux/ethtool.h>

   148

#include <linux/mii.h>

   149

#include <linux/completion.h>

   150

#include <linux/crc32.h>

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#include <linux/io.h>

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#include <linux/uaccess.h>

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#include <linux/gfp.h>

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#include <asm/irq.h>

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   156

#include "../globals.h"

   157

#include "ecdev.h"

   158

   159

#define RTL8139_DRIVER_NAME DRV_NAME \

   160

	" EtherCAT-capable Fast Ethernet driver " \

   161

	DRV_VERSION ", master " EC_MASTER_VERSION

   162

   163

#define PFX DRV_NAME ": "

   164

   165

/* Default Message level */

   166

#define RTL8139_DEF_MSG_ENABLE   (NETIF_MSG_DRV   | \

   167

                                 NETIF_MSG_PROBE  | \

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                                 NETIF_MSG_LINK)

   169

   170

   171

/* define to 1, 2 or 3 to enable copious debugging info */

   172

#define RTL8139_DEBUG 0

   173

   174

/* define to 1 to disable lightweight runtime debugging checks */

   175

#undef RTL8139_NDEBUG

   176

   177

   178

#ifdef RTL8139_NDEBUG

   179

#  define assert(expr) do {} while (0)

   180

#else

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#  define assert(expr) \

   182

        if (unlikely(!(expr))) {				\

   183

		pr_err("Assertion failed! %s,%s,%s,line=%d\n",	\

   184

		       #expr, __FILE__, __func__, __LINE__);	\

   185

        }

   186

#endif

   187

   188

   189

/* A few user-configurable values. */

   190

/* media options */

   191

#define MAX_UNITS 8

   192

static int media[MAX_UNITS] = {-1, -1, -1, -1, -1, -1, -1, -1};

   193

static int full_duplex[MAX_UNITS] = {-1, -1, -1, -1, -1, -1, -1, -1};

   194

   195

/* Whether to use MMIO or PIO. Default to MMIO. */

   196

#ifdef CONFIG_8139TOO_PIO

   197

static bool use_io = true;

   198

#else

   199

static bool use_io = false;

   200

#endif

   201

   202

/* Maximum number of multicast addresses to filter (vs. Rx-all-multicast).

   203

   The RTL chips use a 64 element hash table based on the Ethernet CRC.  */

   204

static int multicast_filter_limit = 32;

   205

   206

/* bitmapped message enable number */

   207

static int debug = -1;

   208

   209

/*

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 * Receive ring size

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 * Warning: 64K ring has hardware issues and may lock up.

   212

 */

   213

#if defined(CONFIG_SH_DREAMCAST)

   214

#define RX_BUF_IDX 0	/* 8K ring */

   215

#else

   216

#define RX_BUF_IDX	2	/* 32K ring */

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#endif

   218

#define RX_BUF_LEN	(8192 << RX_BUF_IDX)

   219

#define RX_BUF_PAD	16

   220

#define RX_BUF_WRAP_PAD 2048 /* spare padding to handle lack of packet wrap */

   221

   222

#if RX_BUF_LEN == 65536

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#define RX_BUF_TOT_LEN	RX_BUF_LEN

   224

#else

   225

#define RX_BUF_TOT_LEN	(RX_BUF_LEN + RX_BUF_PAD + RX_BUF_WRAP_PAD)

   226

#endif

   227

   228

/* Number of Tx descriptor registers. */

   229

#define NUM_TX_DESC	4

   230

   231

/* max supported ethernet frame size -- must be at least (dev->mtu+14+4).*/

   232

#define MAX_ETH_FRAME_SIZE	1536

   233

   234

/* Size of the Tx bounce buffers -- must be at least (dev->mtu+14+4). */

   235

#define TX_BUF_SIZE	MAX_ETH_FRAME_SIZE

   236

#define TX_BUF_TOT_LEN	(TX_BUF_SIZE * NUM_TX_DESC)

   237

   238

/* PCI Tuning Parameters

   239

   Threshold is bytes transferred to chip before transmission starts. */

   240

#define TX_FIFO_THRESH 256	/* In bytes, rounded down to 32 byte units. */

   241

   242

/* The following settings are log_2(bytes)-4:  0 == 16 bytes .. 6==1024, 7==end of packet. */

   243

#define RX_FIFO_THRESH	7	/* Rx buffer level before first PCI xfer.  */

   244

#define RX_DMA_BURST	7	/* Maximum PCI burst, '6' is 1024 */

   245

#define TX_DMA_BURST	6	/* Maximum PCI burst, '6' is 1024 */

   246

#define TX_RETRY	8	/* 0-15.  retries = 16 + (TX_RETRY * 16) */

   247

   248

/* Operational parameters that usually are not changed. */

   249

/* Time in jiffies before concluding the transmitter is hung. */

   250

#define TX_TIMEOUT  (6*HZ)

   251

   252

   253

enum {

   254

	HAS_MII_XCVR = 0x010000,

   255

	HAS_CHIP_XCVR = 0x020000,

   256

	HAS_LNK_CHNG = 0x040000,

   257

};

   258

   259

#define RTL_NUM_STATS 4		/* number of ETHTOOL_GSTATS u64's */

   260

#define RTL_REGS_VER 1		/* version of reg. data in ETHTOOL_GREGS */

   261

#define RTL_MIN_IO_SIZE 0x80

   262

#define RTL8139B_IO_SIZE 256

   263

   264

#define RTL8129_CAPS	HAS_MII_XCVR

   265

#define RTL8139_CAPS	(HAS_CHIP_XCVR|HAS_LNK_CHNG)

   266

   267

typedef enum {

   268

	RTL8139 = 0,

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	RTL8129,

   270

} board_t;

   271

   272

   273

/* indexed by board_t, above */

   274

static const struct {

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	const char *name;

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	u32 hw_flags;

   277

} board_info[] __devinitdata = {

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	{ "RealTek RTL8139", RTL8139_CAPS },

   279

	{ "RealTek RTL8129", RTL8129_CAPS },

   280

};

   281

   282

   283

static DEFINE_PCI_DEVICE_TABLE(rtl8139_pci_tbl) = {

   284

	{0x10ec, 0x8139, PCI_ANY_ID, PCI_ANY_ID, 0, 0, RTL8139 },

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	{0x10ec, 0x8138, PCI_ANY_ID, PCI_ANY_ID, 0, 0, RTL8139 },

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	{0x1113, 0x1211, PCI_ANY_ID, PCI_ANY_ID, 0, 0, RTL8139 },

   287

	{0x1500, 0x1360, PCI_ANY_ID, PCI_ANY_ID, 0, 0, RTL8139 },

   288

	{0x4033, 0x1360, PCI_ANY_ID, PCI_ANY_ID, 0, 0, RTL8139 },

   289

	{0x1186, 0x1300, PCI_ANY_ID, PCI_ANY_ID, 0, 0, RTL8139 },

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	{0x1186, 0x1340, PCI_ANY_ID, PCI_ANY_ID, 0, 0, RTL8139 },

   291

	{0x13d1, 0xab06, PCI_ANY_ID, PCI_ANY_ID, 0, 0, RTL8139 },

   292

	{0x1259, 0xa117, PCI_ANY_ID, PCI_ANY_ID, 0, 0, RTL8139 },

   293

	{0x1259, 0xa11e, PCI_ANY_ID, PCI_ANY_ID, 0, 0, RTL8139 },

   294

	{0x14ea, 0xab06, PCI_ANY_ID, PCI_ANY_ID, 0, 0, RTL8139 },

   295

	{0x14ea, 0xab07, PCI_ANY_ID, PCI_ANY_ID, 0, 0, RTL8139 },

   296

	{0x11db, 0x1234, PCI_ANY_ID, PCI_ANY_ID, 0, 0, RTL8139 },

   297

	{0x1432, 0x9130, PCI_ANY_ID, PCI_ANY_ID, 0, 0, RTL8139 },

   298

	{0x02ac, 0x1012, PCI_ANY_ID, PCI_ANY_ID, 0, 0, RTL8139 },

   299

	{0x018a, 0x0106, PCI_ANY_ID, PCI_ANY_ID, 0, 0, RTL8139 },

   300

	{0x126c, 0x1211, PCI_ANY_ID, PCI_ANY_ID, 0, 0, RTL8139 },

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	{0x1743, 0x8139, PCI_ANY_ID, PCI_ANY_ID, 0, 0, RTL8139 },

   302

	{0x021b, 0x8139, PCI_ANY_ID, PCI_ANY_ID, 0, 0, RTL8139 },

   303

   304

#ifdef CONFIG_SH_SECUREEDGE5410

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	/* Bogus 8139 silicon reports 8129 without external PROM :-( */

   306

	{0x10ec, 0x8129, PCI_ANY_ID, PCI_ANY_ID, 0, 0, RTL8139 },

   307

#endif

   308

#ifdef CONFIG_8139TOO_8129

   309

	{0x10ec, 0x8129, PCI_ANY_ID, PCI_ANY_ID, 0, 0, RTL8129 },

   310

#endif

   311

   312

	/* some crazy cards report invalid vendor ids like

   313

	 * 0x0001 here.  The other ids are valid and constant,

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	 * so we simply don't match on the main vendor id.

   315

	 */

   316

	{PCI_ANY_ID, 0x8139, 0x10ec, 0x8139, 0, 0, RTL8139 },

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	{PCI_ANY_ID, 0x8139, 0x1186, 0x1300, 0, 0, RTL8139 },

   318

	{PCI_ANY_ID, 0x8139, 0x13d1, 0xab06, 0, 0, RTL8139 },

   319

   320

	{0,}

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};

   322

   323

/* prevent driver from being loaded automatically */

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//MODULE_DEVICE_TABLE (pci, rtl8139_pci_tbl);

   325

   326

static struct {

   327

	const char str[ETH_GSTRING_LEN];

   328

} ethtool_stats_keys[] = {

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	{ "early_rx" },

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	{ "tx_buf_mapped" },

   331

	{ "tx_timeouts" },

   332

	{ "rx_lost_in_ring" },

   333

};

   334

   335

/* The rest of these values should never change. */

   336

   337

/* Symbolic offsets to registers. */

   338

enum RTL8139_registers {

   339

	MAC0		= 0,	 /* Ethernet hardware address. */

   340

	MAR0		= 8,	 /* Multicast filter. */

   341

	TxStatus0	= 0x10,	 /* Transmit status (Four 32bit registers). */

   342

	TxAddr0		= 0x20,	 /* Tx descriptors (also four 32bit). */

   343

	RxBuf		= 0x30,

   344

	ChipCmd		= 0x37,

   345

	RxBufPtr	= 0x38,

   346

	RxBufAddr	= 0x3A,

   347

	IntrMask	= 0x3C,

   348

	IntrStatus	= 0x3E,

   349

	TxConfig	= 0x40,

   350

	RxConfig	= 0x44,

   351

	Timer		= 0x48,	 /* A general-purpose counter. */

   352

	RxMissed	= 0x4C,  /* 24 bits valid, write clears. */

   353

	Cfg9346		= 0x50,

   354

	Config0		= 0x51,

   355

	Config1		= 0x52,

   356

	TimerInt	= 0x54,

   357

	MediaStatus	= 0x58,

   358

	Config3		= 0x59,

   359

	Config4		= 0x5A,	 /* absent on RTL-8139A */

   360

	HltClk		= 0x5B,

   361

	MultiIntr	= 0x5C,

   362

	TxSummary	= 0x60,

   363

	BasicModeCtrl	= 0x62,

   364

	BasicModeStatus	= 0x64,

   365

	NWayAdvert	= 0x66,

   366

	NWayLPAR	= 0x68,

   367

	NWayExpansion	= 0x6A,

   368

	/* Undocumented registers, but required for proper operation. */

   369

	FIFOTMS		= 0x70,	 /* FIFO Control and test. */

   370

	CSCR		= 0x74,	 /* Chip Status and Configuration Register. */

   371

	PARA78		= 0x78,

   372

	FlashReg	= 0xD4,	/* Communication with Flash ROM, four bytes. */

   373

	PARA7c		= 0x7c,	 /* Magic transceiver parameter register. */

   374

	Config5		= 0xD8,	 /* absent on RTL-8139A */

   375

};

   376

   377

enum ClearBitMasks {

   378

	MultiIntrClear	= 0xF000,

   379

	ChipCmdClear	= 0xE2,

   380

	Config1Clear	= (1<<7)|(1<<6)|(1<<3)|(1<<2)|(1<<1),

   381

};

   382

   383

enum ChipCmdBits {

   384

	CmdReset	= 0x10,

   385

	CmdRxEnb	= 0x08,

   386

	CmdTxEnb	= 0x04,

   387

	RxBufEmpty	= 0x01,

   388

};

   389

   390

/* Interrupt register bits, using my own meaningful names. */

   391

enum IntrStatusBits {

   392

	PCIErr		= 0x8000,

   393

	PCSTimeout	= 0x4000,

   394

	RxFIFOOver	= 0x40,

   395

	RxUnderrun	= 0x20,

   396

	RxOverflow	= 0x10,

   397

	TxErr		= 0x08,

   398

	TxOK		= 0x04,

   399

	RxErr		= 0x02,

   400

	RxOK		= 0x01,

   401

   402

	RxAckBits	= RxFIFOOver | RxOverflow | RxOK,

   403

};

   404

   405

enum TxStatusBits {

   406

	TxHostOwns	= 0x2000,

   407

	TxUnderrun	= 0x4000,

   408

	TxStatOK	= 0x8000,

   409

	TxOutOfWindow	= 0x20000000,

   410

	TxAborted	= 0x40000000,

   411

	TxCarrierLost	= 0x80000000,

   412

};

   413

enum RxStatusBits {

   414

	RxMulticast	= 0x8000,

   415

	RxPhysical	= 0x4000,

   416

	RxBroadcast	= 0x2000,

   417

	RxBadSymbol	= 0x0020,

   418

	RxRunt		= 0x0010,

   419

	RxTooLong	= 0x0008,

   420

	RxCRCErr	= 0x0004,

   421

	RxBadAlign	= 0x0002,

   422

	RxStatusOK	= 0x0001,

   423

};

   424

   425

/* Bits in RxConfig. */

   426

enum rx_mode_bits {

   427

	AcceptErr	= 0x20,

   428

	AcceptRunt	= 0x10,

   429

	AcceptBroadcast	= 0x08,

   430

	AcceptMulticast	= 0x04,

   431

	AcceptMyPhys	= 0x02,

   432

	AcceptAllPhys	= 0x01,

   433

};

   434

   435

/* Bits in TxConfig. */

   436

enum tx_config_bits {

   437

        /* Interframe Gap Time. Only TxIFG96 doesn't violate IEEE 802.3 */

   438

        TxIFGShift	= 24,

   439

        TxIFG84		= (0 << TxIFGShift), /* 8.4us / 840ns (10 / 100Mbps) */

   440

        TxIFG88		= (1 << TxIFGShift), /* 8.8us / 880ns (10 / 100Mbps) */

   441

        TxIFG92		= (2 << TxIFGShift), /* 9.2us / 920ns (10 / 100Mbps) */

   442

        TxIFG96		= (3 << TxIFGShift), /* 9.6us / 960ns (10 / 100Mbps) */

   443

   444

	TxLoopBack	= (1 << 18) | (1 << 17), /* enable loopback test mode */

   445

	TxCRC		= (1 << 16),	/* DISABLE Tx pkt CRC append */

   446

	TxClearAbt	= (1 << 0),	/* Clear abort (WO) */

   447

	TxDMAShift	= 8, /* DMA burst value (0-7) is shifted X many bits */

   448

	TxRetryShift	= 4, /* TXRR value (0-15) is shifted X many bits */

   449

   450

	TxVersionMask	= 0x7C800000, /* mask out version bits 30-26, 23 */

   451

};

   452

   453

/* Bits in Config1 */

   454

enum Config1Bits {

   455

	Cfg1_PM_Enable	= 0x01,

   456

	Cfg1_VPD_Enable	= 0x02,

   457

	Cfg1_PIO	= 0x04,

   458

	Cfg1_MMIO	= 0x08,

   459

	LWAKE		= 0x10,		/* not on 8139, 8139A */

   460

	Cfg1_Driver_Load = 0x20,

   461

	Cfg1_LED0	= 0x40,

   462

	Cfg1_LED1	= 0x80,

   463

	SLEEP		= (1 << 1),	/* only on 8139, 8139A */

   464

	PWRDN		= (1 << 0),	/* only on 8139, 8139A */

   465

};

   466

   467

/* Bits in Config3 */

   468

enum Config3Bits {

   469

	Cfg3_FBtBEn   	= (1 << 0), /* 1	= Fast Back to Back */

   470

	Cfg3_FuncRegEn	= (1 << 1), /* 1	= enable CardBus Function registers */

   471

	Cfg3_CLKRUN_En	= (1 << 2), /* 1	= enable CLKRUN */

   472

	Cfg3_CardB_En 	= (1 << 3), /* 1	= enable CardBus registers */

   473

	Cfg3_LinkUp   	= (1 << 4), /* 1	= wake up on link up */

   474

	Cfg3_Magic    	= (1 << 5), /* 1	= wake up on Magic Packet (tm) */

   475

	Cfg3_PARM_En  	= (1 << 6), /* 0	= software can set twister parameters */

   476

	Cfg3_GNTSel   	= (1 << 7), /* 1	= delay 1 clock from PCI GNT signal */

   477

};

   478

   479

/* Bits in Config4 */

   480

enum Config4Bits {

   481

	LWPTN	= (1 << 2),	/* not on 8139, 8139A */

   482

};

   483

   484

/* Bits in Config5 */

   485

enum Config5Bits {

   486

	Cfg5_PME_STS   	= (1 << 0), /* 1	= PCI reset resets PME_Status */

   487

	Cfg5_LANWake   	= (1 << 1), /* 1	= enable LANWake signal */

   488

	Cfg5_LDPS      	= (1 << 2), /* 0	= save power when link is down */

   489

	Cfg5_FIFOAddrPtr= (1 << 3), /* Realtek internal SRAM testing */

   490

	Cfg5_UWF        = (1 << 4), /* 1 = accept unicast wakeup frame */

   491

	Cfg5_MWF        = (1 << 5), /* 1 = accept multicast wakeup frame */

   492

	Cfg5_BWF        = (1 << 6), /* 1 = accept broadcast wakeup frame */

   493

};

   494

   495

enum RxConfigBits {

   496

	/* rx fifo threshold */

   497

	RxCfgFIFOShift	= 13,

   498

	RxCfgFIFONone	= (7 << RxCfgFIFOShift),

   499

   500

	/* Max DMA burst */

   501

	RxCfgDMAShift	= 8,

   502

	RxCfgDMAUnlimited = (7 << RxCfgDMAShift),

   503

   504

	/* rx ring buffer length */

   505

	RxCfgRcv8K	= 0,

   506

	RxCfgRcv16K	= (1 << 11),

   507

	RxCfgRcv32K	= (1 << 12),

   508

	RxCfgRcv64K	= (1 << 11) | (1 << 12),

   509

   510

	/* Disable packet wrap at end of Rx buffer. (not possible with 64k) */

   511

	RxNoWrap	= (1 << 7),

   512

};

   513

   514

/* Twister tuning parameters from RealTek.

   515

   Completely undocumented, but required to tune bad links on some boards. */

   516

enum CSCRBits {

   517

	CSCR_LinkOKBit		= 0x0400,

   518

	CSCR_LinkChangeBit	= 0x0800,

   519

	CSCR_LinkStatusBits	= 0x0f000,

   520

	CSCR_LinkDownOffCmd	= 0x003c0,

   521

	CSCR_LinkDownCmd	= 0x0f3c0,

   522

};

   523

   524

enum Cfg9346Bits {

   525

	Cfg9346_Lock	= 0x00,

   526

	Cfg9346_Unlock	= 0xC0,

   527

};

   528

   529

typedef enum {