path: root/drivers/net/r6040.c

/*
 * RDC R6040 Fast Ethernet MAC support
 *
 * Copyright (C) 2004 Sten Wang <sten.wang@rdc.com.tw>
 * Copyright (C) 2007
 *	Daniel Gimpelevich <daniel@gimpelevich.san-francisco.ca.us>
 *	Florian Fainelli <florian@openwrt.org>
 *
 * 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., 51 Franklin Street, Fifth Floor,
 * Boston, MA  02110-1301, USA.
*/

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/mii.h>
#include <linux/ethtool.h>
#include <linux/crc32.h>
#include <linux/spinlock.h>
#include <linux/bitops.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/uaccess.h>

#include <asm/processor.h>

#define DRV_NAME	"r6040"
#define DRV_VERSION	"0.25"
#define DRV_RELDATE	"20Aug2009"

/* PHY CHIP Address */
#define PHY1_ADDR	1	/* For MAC1 */
#define PHY2_ADDR	3	/* For MAC2 */
#define PHY_MODE	0x3100	/* PHY CHIP Register 0 */
#define PHY_CAP		0x01E1	/* PHY CHIP Register 4 */

/* Time in jiffies before concluding the transmitter is hung. */
#define TX_TIMEOUT	(6000 * HZ / 1000)

/* RDC MAC I/O Size */
#define R6040_IO_SIZE	256

/* MAX RDC MAC */
#define MAX_MAC		2

/* MAC registers */
#define MCR0		0x00	/* Control register 0 */
#define MCR1		0x04	/* Control register 1 */
#define  MAC_RST	0x0001	/* Reset the MAC */
#define MBCR		0x08	/* Bus control */
#define MT_ICR		0x0C	/* TX interrupt control */
#define MR_ICR		0x10	/* RX interrupt control */
#define MTPR		0x14	/* TX poll command register */
#define MR_BSR		0x18	/* RX buffer size */
#define MR_DCR		0x1A	/* RX descriptor control */
#define MLSR		0x1C	/* Last status */
#define MMDIO		0x20	/* MDIO control register */
#define  MDIO_WRITE	0x4000	/* MDIO write */
#define  MDIO_READ	0x2000	/* MDIO read */
#define MMRD		0x24	/* MDIO read data register */
#define MMWD		0x28	/* MDIO write data register */
#define MTD_SA0		0x2C	/* TX descriptor start address 0 */
#define MTD_SA1		0x30	/* TX descriptor start address 1 */
#define MRD_SA0		0x34	/* RX descriptor start address 0 */
#define MRD_SA1		0x38	/* RX descriptor start address 1 */
#define MISR		0x3C	/* Status register */
#define MIER		0x40	/* INT enable register */
#define  MSK_INT	0x0000	/* Mask off interrupts */
#define  RX_FINISH	0x0001  /* RX finished */
#define  RX_NO_DESC	0x0002  /* No RX descriptor available */
#define  RX_FIFO_FULL	0x0004  /* RX FIFO full */
#define  RX_EARLY	0x0008  /* RX early */
#define  TX_FINISH	0x0010  /* TX finished */
#define  TX_EARLY	0x0080  /* TX early */
#define  EVENT_OVRFL	0x0100  /* Event counter overflow */
#define  LINK_CHANGED	0x0200  /* PHY link changed */
#define ME_CISR		0x44	/* Event counter INT status */
#define ME_CIER		0x48	/* Event counter INT enable  */
#define MR_CNT		0x50	/* Successfully received packet counter */
#define ME_CNT0		0x52	/* Event counter 0 */
#define ME_CNT1		0x54	/* Event counter 1 */
#define ME_CNT2		0x56	/* Event counter 2 */
#define ME_CNT3		0x58	/* Event counter 3 */
#define MT_CNT		0x5A	/* Successfully transmit packet counter */
#define ME_CNT4		0x5C	/* Event counter 4 */
#define MP_CNT		0x5E	/* Pause frame counter register */
#define MAR0		0x60	/* Hash table 0 */
#define MAR1		0x62	/* Hash table 1 */
#define MAR2		0x64	/* Hash table 2 */
#define MAR3		0x66	/* Hash table 3 */
#define MID_0L		0x68	/* Multicast address MID0 Low */
#define MID_0M		0x6A	/* Multicast address MID0 Medium */
#define MID_0H		0x6C	/* Multicast address MID0 High */
#define MID_1L		0x70	/* MID1 Low */
#define MID_1M		0x72	/* MID1 Medium */
#define MID_1H		0x74	/* MID1 High */
#define MID_2L		0x78	/* MID2 Low */
#define MID_2M		0x7A	/* MID2 Medium */
#define MID_2H		0x7C	/* MID2 High */
#define MID_3L		0x80	/* MID3 Low */
#define MID_3M		0x82	/* MID3 Medium */
#define MID_3H		0x84	/* MID3 High */
#define PHY_CC		0x88	/* PHY status change configuration register */
#define PHY_ST		0x8A	/* PHY status register */
#define MAC_SM		0xAC	/* MAC status machine */
#define MAC_ID		0xBE	/* Identifier register */

#define TX_DCNT		0x80	/* TX descriptor count */
#define RX_DCNT		0x80	/* RX descriptor count */
#define MAX_BUF_SIZE	0x600
#define RX_DESC_SIZE	(RX_DCNT * sizeof(struct r6040_descriptor))
#define TX_DESC_SIZE	(TX_DCNT * sizeof(struct r6040_descriptor))
#define MBCR_DEFAULT	0x012A	/* MAC Bus Control Register */
#define MCAST_MAX	4	/* Max number multicast addresses to filter */

/* Descriptor status */
#define DSC_OWNER_MAC	0x8000	/* MAC is the owner of this descriptor */
#define DSC_RX_OK	0x4000	/* RX was successful */
#define DSC_RX_ERR	0x0800	/* RX PHY error */
#define DSC_RX_ERR_DRI	0x0400	/* RX dribble packet */
#define DSC_RX_ERR_BUF	0x0200	/* RX length exceeds buffer size */
#define DSC_RX_ERR_LONG	0x0100	/* RX length > maximum packet length */
#define DSC_RX_ERR_RUNT	0x0080	/* RX packet length < 64 byte */
#define DSC_RX_ERR_CRC	0x0040	/* RX CRC error */
#define DSC_RX_BCAST	0x0020	/* RX broadcast (no error) */
#define DSC_RX_MCAST	0x0010	/* RX multicast (no error) */
#define DSC_RX_MCH_HIT	0x0008	/* RX multicast hit in hash table (no error) */
#define DSC_RX_MIDH_HIT	0x0004	/* RX MID table hit (no error) */
#define DSC_RX_IDX_MID_MASK 3	/* RX mask for the index of matched MIDx */

/* PHY settings */
#define ICPLUS_PHY_ID	0x0243

MODULE_AUTHOR("Sten Wang <sten.wang@rdc.com.tw>,"
	"Daniel Gimpelevich <daniel@gimpelevich.san-francisco.ca.us>,"
	"Florian Fainelli <florian@openwrt.org>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("RDC R6040 NAPI PCI FastEthernet driver");
MODULE_VERSION(DRV_VERSION " " DRV_RELDATE);

/* RX and TX interrupts that we handle */
#define RX_INTS			(RX_FIFO_FULL | RX_NO_DESC | RX_FINISH)
#define TX_INTS			(TX_FINISH)
#define INT_MASK		(RX_INTS | TX_INTS)

struct r6040_descriptor {
	u16	status, len;		/* 0-3 */
	__le32