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

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 *

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 *  $Id$

     4

 *

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 *  Copyright (C) 2007-2008  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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 *

    22

 *  ---

    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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 *  ---

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 *

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 *  vim: noexpandtab

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 *

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

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    34

/**

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   \file

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   EtherCAT driver for e100-compatible NICs.

    37

*/

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    39

/* Former documentation: */

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    41

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

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    43

  Intel PRO/100 Linux driver

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  Copyright(c) 1999 - 2006 Intel Corporation.

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

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

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  version 2, as published by the Free Software Foundation.

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

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  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    52

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

    53

  more details.

    54

    55

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

    56

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

    57

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

    58

    59

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

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  the file called "COPYING".

    61

    62

  Contact Information:

    63

  Linux NICS <linux.nics@intel.com>

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

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

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    67

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

    68

    69

/*

    70

 *	e100.c: Intel(R) PRO/100 ethernet driver

    71

 *

    72

 *	(Re)written 2003 by scott.feldman@intel.com.  Based loosely on

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 *	original e100 driver, but better described as a munging of

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 *	e100, e1000, eepro100, tg3, 8139cp, and other drivers.

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 *

    76

 *	References:

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 *		Intel 8255x 10/100 Mbps Ethernet Controller Family,

    78

 *		Open Source Software Developers Manual,

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 *		http://sourceforge.net/projects/e1000

    80

 *

    81

 *

    82

 *	                      Theory of Operation

    83

 *

    84

 *	I.   General

    85

 *

    86

 *	The driver supports Intel(R) 10/100 Mbps PCI Fast Ethernet

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 *	controller family, which includes the 82557, 82558, 82559, 82550,

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 *	82551, and 82562 devices.  82558 and greater controllers

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 *	integrate the Intel 82555 PHY.  The controllers are used in

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 *	server and client network interface cards, as well as in

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 *	LAN-On-Motherboard (LOM), CardBus, MiniPCI, and ICHx

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 *	configurations.  8255x supports a 32-bit linear addressing

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 *	mode and operates at 33Mhz PCI clock rate.

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 *

    95

 *	II.  Driver Operation

    96

 *

    97

 *	Memory-mapped mode is used exclusively to access the device's

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 *	shared-memory structure, the Control/Status Registers (CSR). All

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 *	setup, configuration, and control of the device, including queuing

   100

 *	of Tx, Rx, and configuration commands is through the CSR.

   101

 *	cmd_lock serializes accesses to the CSR command register.  cb_lock

   102

 *	protects the shared Command Block List (CBL).

   103

 *

   104

 *	8255x is highly MII-compliant and all access to the PHY go

   105

 *	through the Management Data Interface (MDI).  Consequently, the

   106

 *	driver leverages the mii.c library shared with other MII-compliant

   107

 *	devices.

   108

 *

   109

 *	Big- and Little-Endian byte order as well as 32- and 64-bit

   110

 *	archs are supported.  Weak-ordered memory and non-cache-coherent

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 *	archs are supported.

   112

 *

   113

 *	III. Transmit

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 *

   115

 *	A Tx skb is mapped and hangs off of a TCB.  TCBs are linked

   116

 *	together in a fixed-size ring (CBL) thus forming the flexible mode

   117

 *	memory structure.  A TCB marked with the suspend-bit indicates

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 *	the end of the ring.  The last TCB processed suspends the

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 *	controller, and the controller can be restarted by issue a CU

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 *	resume command to continue from the suspend point, or a CU start

   121

 *	command to start at a given position in the ring.

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 *

   123

 *	Non-Tx commands (config, multicast setup, etc) are linked

   124

 *	into the CBL ring along with Tx commands.  The common structure

   125

 *	used for both Tx and non-Tx commands is the Command Block (CB).

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 *

   127

 *	cb_to_use is the next CB to use for queuing a command; cb_to_clean

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 *	is the next CB to check for completion; cb_to_send is the first

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 *	CB to start on in case of a previous failure to resume.  CB clean

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 *	up happens in interrupt context in response to a CU interrupt.

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 *	cbs_avail keeps track of number of free CB resources available.

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 *

   133

 * 	Hardware padding of short packets to minimum packet size is

   134

 * 	enabled.  82557 pads with 7Eh, while the later controllers pad

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 * 	with 00h.

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 *

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 *	IV.  Receive

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 *

   139

 *	The Receive Frame Area (RFA) comprises a ring of Receive Frame

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 *	Descriptors (RFD) + data buffer, thus forming the simplified mode

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 *	memory structure.  Rx skbs are allocated to contain both the RFD

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 *	and the data buffer, but the RFD is pulled off before the skb is

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 *	indicated.  The data buffer is aligned such that encapsulated

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 *	protocol headers are u32-aligned.  Since the RFD is part of the

   145

 *	mapped shared memory, and completion status is contained within

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 *	the RFD, the RFD must be dma_sync'ed to maintain a consistent

   147

 *	view from software and hardware.

   148

 *

   149

 *	In order to keep updates to the RFD link field from colliding with

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 *	hardware writes to mark packets complete, we use the feature that

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 *	hardware will not write to a size 0 descriptor and mark the previous

   152

 *	packet as end-of-list (EL).   After updating the link, we remove EL

   153

 *	and only then restore the size such that hardware may use the

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 *	previous-to-end RFD.

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 *

   156

 *	Under typical operation, the  receive unit (RU) is start once,

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 *	and the controller happily fills RFDs as frames arrive.  If

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 *	replacement RFDs cannot be allocated, or the RU goes non-active,

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 *	the RU must be restarted.  Frame arrival generates an interrupt,

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 *	and Rx indication and re-allocation happen in the same context,

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 *	therefore no locking is required.  A software-generated interrupt

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 *	is generated from the watchdog to recover from a failed allocation

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 *	scenario where all Rx resources have been indicated and none re-

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 *	placed.

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 *

   166

 *	V.   Miscellaneous

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 *

   168

 * 	VLAN offloading of tagging, stripping and filtering is not

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 * 	supported, but driver will accommodate the extra 4-byte VLAN tag

   170

 * 	for processing by upper layers.  Tx/Rx Checksum offloading is not

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 * 	supported.  Tx Scatter/Gather is not supported.  Jumbo Frames is

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 * 	not supported (hardware limitation).

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 *

   174

 * 	MagicPacket(tm) WoL support is enabled/disabled via ethtool.

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 *

   176

 * 	Thanks to JC (jchapman@katalix.com) for helping with

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 * 	testing/troubleshooting the development driver.

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 *

   179

 * 	TODO:

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 * 	o several entry points race with dev->close

   181

 * 	o check for tx-no-resources/stop Q races with tx clean/wake Q

   182

 *

   183

 *	FIXES:

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 * 2005/12/02 - Michael O'Donnell <Michael.ODonnell at stratus dot com>

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 *	- Stratus87247: protect MDI control register manipulations

   186

 */

   187

   188

#include <linux/module.h>

   189

#include <linux/moduleparam.h>

   190

#include <linux/kernel.h>

   191

#include <linux/types.h>

   192

#include <linux/slab.h>

   193

#include <linux/delay.h>

   194

#include <linux/init.h>

   195

#include <linux/pci.h>

   196

#include <linux/dma-mapping.h>

   197

#include <linux/netdevice.h>

   198

#include <linux/etherdevice.h>

   199

#include <linux/mii.h>

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#include <linux/if_vlan.h>

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#include <linux/skbuff.h>

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#include <linux/ethtool.h>

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#include <linux/string.h>

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#include <asm/unaligned.h>

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// EtherCAT includes

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#include "../globals.h"

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#include "ecdev.h"

   209

   210

#define DRV_NAME		"ec_e100"

   211

   212

#define DRV_EXT			"-NAPI"

   213

#define DRV_VERSION		"3.5.23-k6"DRV_EXT

   214

#define DRV_DESCRIPTION		"Intel(R) PRO/100 Network Driver"

   215

#define DRV_COPYRIGHT		"Copyright(c) 1999-2006 Intel Corporation"

   216

#define PFX			DRV_NAME ": "

   217

   218

#define E100_WATCHDOG_PERIOD	(2 * HZ)

   219

#define E100_NAPI_WEIGHT	16

   220

   221

MODULE_DESCRIPTION(DRV_DESCRIPTION);

   222

MODULE_AUTHOR(DRV_COPYRIGHT);

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MODULE_LICENSE("GPL");

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MODULE_VERSION(DRV_VERSION);

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   226

MODULE_DESCRIPTION(DRV_DESCRIPTION);

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MODULE_AUTHOR("Mario Witkowski <mario.witkowski@w4systems.de>");

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MODULE_LICENSE("GPL");

   229

MODULE_VERSION(DRV_VERSION ", master " EC_MASTER_VERSION);

   230

   231

void e100_ec_poll(struct net_device *);

   232

   233

static int debug = 3;

   234

static int eeprom_bad_csum_allow = 0;

   235

static int use_io = 0;

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module_param(debug, int, 0);

   237

module_param(eeprom_bad_csum_allow, int, 0);

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module_param(use_io, int, 0);

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MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");

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MODULE_PARM_DESC(eeprom_bad_csum_allow, "Allow bad eeprom checksums");

   241

MODULE_PARM_DESC(use_io, "Force use of i/o access mode");

   242

#define DPRINTK(nlevel, klevel, fmt, args...) \

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	(void)((NETIF_MSG_##nlevel & nic->msg_enable) && \

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	printk(KERN_##klevel PFX "%s: %s: " fmt, nic->netdev->name, \

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		__func__ , ## args))

   246

   247

#define INTEL_8255X_ETHERNET_DEVICE(device_id, ich) {\

   248

	PCI_VENDOR_ID_INTEL, device_id, PCI_ANY_ID, PCI_ANY_ID, \

   249

	PCI_CLASS_NETWORK_ETHERNET << 8, 0xFFFF00, ich }

   250

static struct pci_device_id e100_id_table[] = {

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	INTEL_8255X_ETHERNET_DEVICE(0x1029, 0),

   252

	INTEL_8255X_ETHERNET_DEVICE(0x1030, 0),

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	INTEL_8255X_ETHERNET_DEVICE(0x1031, 3),

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	INTEL_8255X_ETHERNET_DEVICE(0x1032, 3),

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	INTEL_8255X_ETHERNET_DEVICE(0x1033, 3),

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	INTEL_8255X_ETHERNET_DEVICE(0x1034, 3),

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	INTEL_8255X_ETHERNET_DEVICE(0x1038, 3),

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	INTEL_8255X_ETHERNET_DEVICE(0x1039, 4),

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	INTEL_8255X_ETHERNET_DEVICE(0x103A, 4),

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	INTEL_8255X_ETHERNET_DEVICE(0x103B, 4),

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	INTEL_8255X_ETHERNET_DEVICE(0x103C, 4),

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	INTEL_8255X_ETHERNET_DEVICE(0x103D, 4),

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	INTEL_8255X_ETHERNET_DEVICE(0x103E, 4),

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	INTEL_8255X_ETHERNET_DEVICE(0x1050, 5),

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	INTEL_8255X_ETHERNET_DEVICE(0x1051, 5),

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	INTEL_8255X_ETHERNET_DEVICE(0x1052, 5),

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	INTEL_8255X_ETHERNET_DEVICE(0x1053, 5),

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	INTEL_8255X_ETHERNET_DEVICE(0x1054, 5),

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	INTEL_8255X_ETHERNET_DEVICE(0x1055, 5),

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	INTEL_8255X_ETHERNET_DEVICE(0x1056, 5),

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	INTEL_8255X_ETHERNET_DEVICE(0x1057, 5),

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	INTEL_8255X_ETHERNET_DEVICE(0x1059, 0),

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	INTEL_8255X_ETHERNET_DEVICE(0x1064, 6),

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	INTEL_8255X_ETHERNET_DEVICE(0x1065, 6),

   275

	INTEL_8255X_ETHERNET_DEVICE(0x1066, 6),

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	INTEL_8255X_ETHERNET_DEVICE(0x1067, 6),

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	INTEL_8255X_ETHERNET_DEVICE(0x1068, 6),

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	INTEL_8255X_ETHERNET_DEVICE(0x1069, 6),

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	INTEL_8255X_ETHERNET_DEVICE(0x106A, 6),

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	INTEL_8255X_ETHERNET_DEVICE(0x106B, 6),

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	INTEL_8255X_ETHERNET_DEVICE(0x1091, 7),

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	INTEL_8255X_ETHERNET_DEVICE(0x1092, 7),

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	INTEL_8255X_ETHERNET_DEVICE(0x1093, 7),

   284

	INTEL_8255X_ETHERNET_DEVICE(0x1094, 7),

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	INTEL_8255X_ETHERNET_DEVICE(0x1095, 7),

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	INTEL_8255X_ETHERNET_DEVICE(0x1209, 0),

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	INTEL_8255X_ETHERNET_DEVICE(0x1229, 0),

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	INTEL_8255X_ETHERNET_DEVICE(0x2449, 2),

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	INTEL_8255X_ETHERNET_DEVICE(0x2459, 2),

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	INTEL_8255X_ETHERNET_DEVICE(0x245D, 2),

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	INTEL_8255X_ETHERNET_DEVICE(0x27DC, 7),

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	{ 0, }

   293

};

   294

   295

// prevent from being loaded automatically

   296

//MODULE_DEVICE_TABLE(pci, e100_id_table);

   297

   298

enum mac {

   299

	mac_82557_D100_A  = 0,

   300

	mac_82557_D100_B  = 1,

   301

	mac_82557_D100_C  = 2,

   302

	mac_82558_D101_A4 = 4,

   303

	mac_82558_D101_B0 = 5,

   304

	mac_82559_D101M   = 8,

   305

	mac_82559_D101S   = 9,

   306

	mac_82550_D102    = 12,

   307

	mac_82550_D102_C  = 13,

   308

	mac_82551_E       = 14,

   309

	mac_82551_F       = 15,

   310

	mac_82551_10      = 16,

   311

	mac_unknown       = 0xFF,

   312

};

   313

   314

enum phy {

   315

	phy_100a     = 0x000003E0,

   316

	phy_100c     = 0x035002A8,

   317

	phy_82555_tx = 0x015002A8,

   318

	phy_nsc_tx   = 0x5C002000,

   319

	phy_82562_et = 0x033002A8,

   320

	phy_82562_em = 0x032002A8,

   321

	phy_82562_ek = 0x031002A8,

   322

	phy_82562_eh = 0x017002A8,

   323

	phy_unknown  = 0xFFFFFFFF,

   324

};

   325

   326

/* CSR (Control/Status Registers) */

   327

struct csr {

   328

	struct {

   329

		u8 status;

   330

		u8 stat_ack;

   331

		u8 cmd_lo;

   332

		u8 cmd_hi;

   333

		u32 gen_ptr;

   334

	} scb;

   335

	u32 port;

   336

	u16 flash_ctrl;

   337

	u8 eeprom_ctrl_lo;

   338

	u8 eeprom_ctrl_hi;

   339

	u32 mdi_ctrl;

   340

	u32 rx_dma_count;

   341

};

   342

   343

enum scb_status {

   344

	rus_no_res       = 0x08,

   345

	rus_ready        = 0x10,

   346

	rus_mask         = 0x3C,

   347

};

   348

   349

enum ru_state  {

   350

	RU_SUSPENDED = 0,

   351

	RU_RUNNING	 = 1,

   352

	RU_UNINITIALIZED = -1,

   353

};

   354

   355

enum scb_stat_ack {

   356

	stat_ack_not_ours    = 0x00,

   357

	stat_ack_sw_gen      = 0x04,

   358

	stat_ack_rnr         = 0x10,

   359

	stat_ack_cu_idle     = 0x20,

   360

	stat_ack_frame_rx    = 0x40,

   361

	stat_ack_cu_cmd_done = 0x80,

   362

	stat_ack_not_present = 0xFF,

   363

	stat_ack_rx = (stat_ack_sw_gen | stat_ack_rnr | stat_ack_frame_rx),

   364

	stat_ack_tx = (stat_ack_cu_idle | stat_ack_cu_cmd_done),

   365

};

   366

   367

enum scb_cmd_hi {

   368

	irq_mask_none = 0x00,

   369

	irq_mask_all  = 0x01,

   370

	irq_sw_gen    = 0x02,

   371

};

   372

   373

enum scb_cmd_lo {

   374

	cuc_nop        = 0x00,

   375

	ruc_start      = 0x01,

   376

	ruc_load_base  = 0x06,

   377

	cuc_start      = 0x10,

   378

	cuc_resume     = 0x20,

   379

	cuc_dump_addr  = 0x40,

   380

	cuc_dump_stats = 0x50,

   381

	cuc_load_base  = 0x60,

   382

	cuc_dump_reset = 0x70,

   383

};

   384

   385

enum cuc_dump {

   386

	cuc_dump_complete       = 0x0000A005,

   387

	cuc_dump_reset_complete = 0x0000A007,

   388

};

   389

   390

enum port {

   391

	software_reset  = 0x0000,

   392

	selftest        = 0x0001,

   393

	selective_reset = 0x0002,

   394

};

   395

   396

enum eeprom_ctrl_lo {

   397

	eesk = 0x01,

   398

	eecs = 0x02,

   399

	eedi = 0x04,

   400

	eedo = 0x08,

   401

};

   402

   403

enum mdi_ctrl {

   404

	mdi_write = 0x04000000,

   405

	mdi_read  = 0x08000000,

   406

	mdi_ready = 0x10000000,

   407

};

   408

   409

enum eeprom_op {

   410

	op_write = 0x05,

   411

	op_read  = 0x06,

   412

	op_ewds  = 0x10,

   413

	op_ewen  = 0x13,

   414

};

   415

   416

enum eeprom_offsets {

   417

	eeprom_cnfg_mdix  = 0x03,

   418

	eeprom_id         = 0x0A,

   419

	eeprom_config_asf = 0x0D,

   420

	eeprom_smbus_addr = 0x90,

   421

};

   422

   423

enum eeprom_cnfg_mdix {

   424

	eeprom_mdix_enabled = 0x0080,

   425

};

   426

   427

enum eeprom_id {

   428

	eeprom_id_wol = 0x0020,

   429

};

   430

   431

enum eeprom_config_asf {

   432

	eeprom_asf = 0x8000,

   433

	eeprom_gcl = 0x4000,

   434

};

   435

   436

enum cb_status {

   437

	cb_complete = 0x8000,

   438

	cb_ok       = 0x2000,

   439

};

   440

   441

enum cb_command {

   442

	cb_nop    = 0x0000,

   443

	cb_iaaddr = 0x0001,

   444

	cb_config = 0x0002,

   445

	cb_multi  = 0x0003,

   446

	cb_tx     = 0x0004,

   447

	cb_ucode  = 0x0005,

   448

	cb_dump   = 0x0006,

   449

	cb_tx_sf  = 0x0008,

   450

	cb_cid    = 0x1f00,

   451

	cb_i      = 0x2000,

   452

	cb_s      = 0x4000,

   453

	cb_el     = 0x8000,

   454

};

   455

   456

struct rfd {

   457

	__le16 status;

   458

	__le16 command;

   459

	__le32 link;

   460

	__le32 rbd;

   461

	__le16 actual_size;

   462

	__le16 size;

   463

};

   464

   465

struct rx {

   466

	struct rx *next, *prev;

   467

	struct sk_buff *skb;

   468

	dma_addr_t dma_addr;

   469

};

   470

   471

#if defined(__BIG_ENDIAN_BITFIELD)

   472

#define X(a,b)	b,a

   473

#else

   474

#define X(a,b)	a,b

   475

#endif

   476

struct config {

   477

/*0*/	u8 X(byte_count:6, pad0:2);

   478

/*1*/	u8 X(X(rx_fifo_limit:4, tx_fifo_limit:3), pad1:1);

   479

/*2*/	u8 adaptive_ifs;

   480

/*3*/	u8 X(X(X(X(mwi_enable:1, type_enable:1), read_align_enable:1),

   481

	   term_write_cache_line:1), pad3:4);

   482

/*4*/	u8 X(rx_dma_max_count:7, pad4:1);

   483

/*5*/	u8 X(tx_dma_max_count:7, dma_max_count_enable:1);

   484

/*6*/	u8 X(X(X(X(X(X(X(late_scb_update:1, direct_rx_dma:1),

   485

	   tno_intr:1), cna_intr:1), standard_tcb:1), standard_stat_counter:1),

   486

	   rx_discard_overruns:1), rx_save_bad_frames:1);

   487

/*7*/	u8 X(X(X(X(X(rx_discard_short_frames:1, tx_underrun_retry:2),

   488

	   pad7:2), rx_extended_rfd:1), tx_two_frames_in_fifo:1),

   489

	   tx_dynamic_tbd:1);

   490

/*8*/	u8 X(X(mii_mode:1, pad8:6), csma_disabled:1);

   491

/*9*/	u8 X(X(X(X(X(rx_tcpudp_checksum:1, pad9:3), vlan_arp_tco:1),

   492

	   link_status_wake:1), arp_wake:1), mcmatch_wake:1);

   493

/*10*/	u8 X(X(X(pad10:3, no_source_addr_insertion:1), preamble_length:2),

   494

	   loopback:2);

   495

/*11*/	u8 X(linear_priority:3, pad11:5);

   496

/*12*/	u8 X(X(linear_priority_mode:1, pad12:3), ifs:4);

   497

/*13*/	u8 ip_addr_lo;

   498

/*14*/	u8 ip_addr_hi;

   499

/*15*/	u8 X(X(X(X(X(X(X(promiscuous_mode:1, broadcast_disabled:1),

   500

	   wait_after_win:1), pad15_1:1), ignore_ul_bit:1), crc_16_bit:1),

   501

	   pad15_2:1), crs_or_cdt:1);

   502

/*16*/	u8 fc_delay_lo;

   503

/*17*/	u8 fc_delay_hi;

   504

/*18*/	u8 X(X(X(X(X(rx_stripping:1, tx_padding:1), rx_crc_transfer:1),

   505

	   rx_long_ok:1), fc_priority_threshold:3), pad18:1);

   506

/*19*/	u8 X(X(X(X(X(X(X(addr_wake:1, magic_packet_disable:1),

   507

	   fc_disable:1), fc_restop:1), fc_restart:1), fc_reject:1),

   508

	   full_duplex_force:1), full_duplex_pin:1);

   509

/*20*/	u8 X(X(X(pad20_1:5, fc_priority_location:1), multi_ia:1), pad20_2:1);

   510

/*21*/	u8 X(X(pad21_1:3, multicast_all:1), pad21_2:4);

   511

/*22*/	u8 X(X(rx_d102_mode:1, rx_vlan_drop:1), pad22:6);

   512

	u8 pad_d102[9];

   513

};

   514

   515

#define E100_MAX_MULTICAST_ADDRS	64

   516

struct multi {

   517

	__le16 count;

   518

	u8 addr[E100_MAX_MULTICAST_ADDRS * ETH_ALEN + 2/*pad*/];

   519

};

   520

   521

/* Important: keep total struct u32-aligned */

   522

#define UCODE_SIZE			134

   523

struct cb {

   524

	__le16 status;

   525

	__le16 command;

   526

	__le32 link;

   527

	union {

   528

		u8 iaaddr[ETH_ALEN];

   529

		__le32 ucode[UCODE_SIZE];

   530