path: root/drivers/net/pasemi_mac.c

/*
 * Copyright (C) 2006-2007 PA Semi, Inc
 *
 * Driver for the PA Semi PWRficient onchip 1G/10G Ethernet MACs
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <linux/dmaengine.h>
#include <linux/delay.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <asm/dma-mapping.h>
#include <linux/in.h>
#include <linux/skbuff.h>

#include <linux/ip.h>
#include <linux/tcp.h>
#include <net/checksum.h>

#include <asm/irq.h>

#include "pasemi_mac.h"


/* TODO list
 *
 * - Get rid of pci_{read,write}_config(), map registers with ioremap
 *   for performance
 * - PHY support
 * - Multicast support
 * - Large MTU support
 * - Other performance improvements
 */


/* Must be a power of two */
#define RX_RING_SIZE 512
#define TX_RING_SIZE 512

#define DEFAULT_MSG_ENABLE	  \
	(NETIF_MSG_DRV		| \
	 NETIF_MSG_PROBE	| \
	 NETIF_MSG_LINK		| \
	 NETIF_MSG_TIMER	| \
	 NETIF_MSG_IFDOWN	| \
	 NETIF_MSG_IFUP		| \
	 NETIF_MSG_RX_ERR	| \
	 NETIF_MSG_TX_ERR)

#define TX_DESC(mac, num)	((mac)->tx->desc[(num) & (TX_RING_SIZE-1)])
#define TX_DESC_INFO(mac, num)	((mac)->tx->desc_info[(num) & (TX_RING_SIZE-1)])
#define RX_DESC(mac, num)	((mac)->rx->desc[(num) & (RX_RING_SIZE-1)])
#define RX_DESC_INFO(mac, num)	((mac)->rx->desc_info[(num) & (RX_RING_SIZE-1)])
#define RX_BUFF(mac, num)	((mac)->rx->buffers[(num) & (RX_RING_SIZE-1)])

#define RING_USED(ring)		(((ring)->next_to_fill - (ring)->next_to_clean) \
				 & ((ring)->size - 1))
#define RING_AVAIL(ring)	((ring->size) - RING_USED(ring))

#define BUF_SIZE 1646 /* 1500 MTU + ETH_HLEN + VLAN_HLEN + 2 64B cachelines */

MODULE_LICENSE("GPL");
MODULE_AUTHOR ("Olof Johansson <olof@lixom.net>");
MODULE_DESCRIPTION("PA Semi PWRficient Ethernet driver");

static int debug = -1;	/* -1 == use DEFAULT_MSG_ENABLE as value */
module_param(debug, int, 0);
MODULE_PARM_DESC(debug, "PA Semi MAC bitmapped debugging message enable value");

static struct pasdma_status *dma_status;

static unsigned int read_iob_reg(struct pasemi_mac *mac, unsigned int reg)
{
	return in_le32(mac->iob_regs+reg);
}

static void write_iob_reg(struct pasemi_mac *mac, unsigned int reg,
			  unsigned int val)
{
	out_le32(mac->iob_regs+reg, val);
}

static unsigned int read_mac_reg(struct pasemi_mac *mac, unsigned int reg)
{
	return in_le32(mac->regs+reg);
}

static void write_mac_reg(struct pasemi_mac *mac, unsigned int reg,
			  unsigned int val)
{
	out_le32(mac->regs+reg, val);
}

static unsigned int read_dma_reg(struct pasemi_mac *mac, unsigned int reg)
{
	return