path: root/drivers/net/ethernet/micrel/ks8695net.c

/*
 * Micrel KS8695 (Centaur) Ethernet.
 *
 * 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.
 *
 * Copyright 2008 Simtec Electronics
 *		  Daniel Silverstone <dsilvers@simtec.co.uk>
 *		  Vincent Sanders <vince@simtec.co.uk>
 */

#include <linux/dma-mapping.h>
#include <linux/module.h>
#include <linux/ioport.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/interrupt.h>
#include <linux/skbuff.h>
#include <linux/spinlock.h>
#include <linux/crc32.h>
#include <linux/mii.h>
#include <linux/ethtool.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <linux/slab.h>

#include <asm/irq.h>

#include <mach/regs-switch.h>
#include <mach/regs-misc.h>
#include <asm/mach/irq.h>
#include <mach/regs-irq.h>

#include "ks8695net.h"

#define MODULENAME	"ks8695_ether"
#define MODULEVERSION	"1.02"

/*
 * Transmit and device reset timeout, default 5 seconds.
 */
static int watchdog = 5000;

/* Hardware structures */

/**
 *	struct rx_ring_desc - Receive descriptor ring element
 *	@status: The status of the descriptor element (E.g. who owns it)
 *	@length: The number of bytes in the block pointed to by data_ptr
 *	@data_ptr: The physical address of the data block to receive into
 *	@next_desc: The physical address of the next descriptor element.
 */
struct rx_ring_desc {
	__le32	status;
	__le32	length;
	__le32	data_ptr;
	__le32	next_desc;
};

/**
 *	struct tx_ring_desc - Transmit descriptor ring element
 *	@owner: Who owns the descriptor
 *	@status: The number of bytes in the block pointed to by data_ptr
 *	@data_ptr: The physical address of the data block to receive into
 *	@next_desc: The physical address of the next descriptor element.
 */
struct tx_ring_desc {
	__le32	owner;
	__le32	status;
	__le32	data_ptr;
	__le32	next_desc;
};

/**
 *	struct ks8695_skbuff - sk_buff wrapper for rx/tx rings.
 *	@skb: The buffer in the ring
 *	@dma_ptr: The mapped DMA pointer of the buffer
 *	@length: The number of bytes mapped to dma_ptr
 */
struct ks8695_skbuff {
	struct sk_buff	*skb;
	dma_addr_t	dma_ptr;
	u32		length;
};

/* Private device structure */

#define MAX_TX_DESC 8
#define MAX_TX_DESC_MASK 0x7
#define MAX_RX_DESC 16
#define MAX_RX_DESC_MASK 0xf

/*napi_weight have better more than rx DMA buffers*/
#define NAPI_WEIGHT   64

#define MAX_RXBUF_SIZE 0x700

#define TX_RING_DMA_SIZE (sizeof(struct tx_ring_desc) * MAX_TX_DESC)
#define RX_RING_DMA_SIZE (sizeof(struct rx_ring_desc) * MAX_RX_DESC)
#define RING_DMA_SIZE (TX_RING_DMA_SIZE + RX_RING_D