path: root/drivers/net/korina.c

/*
 *  Driver for the IDT RC32434 (Korina) on-chip ethernet controller.
 *
 *  Copyright 2004 IDT Inc. (rischelp@idt.com)
 *  Copyright 2006 Felix Fietkau <nbd@openwrt.org>
 *  Copyright 2008 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  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
 *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
 *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
 *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *  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.,
 *  675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *  Writing to a DMA status register:
 *
 *  When writing to the status register, you should mask the bit you have
 *  been testing the status register with. Both Tx and Rx DMA registers
 *  should stick to this procedure.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/moduleparam.h>
#include <linux/sched.h>
#include <linux/ctype.h>
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/in.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/delay.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/errno.h>
#include <linux/platform_device.h>
#include <linux/mii.h>
#include <linux/ethtool.h>
#include <linux/crc32.h>

#include <asm/bootinfo.h>
#include <asm/system.h>
#include <asm/bitops.h>
#include <asm/pgtable.h>
#include <asm/segment.h>
#include <asm/io.h>
#include <asm/dma.h>

#include <asm/mach-rc32434/rb.h>
#include <asm/mach-rc32434/rc32434.h>
#include <asm/mach-rc32434/eth.h>
#include <asm/mach-rc32434/dma_v.h>

#define DRV_NAME        "korina"
#define DRV_VERSION     "0.10"
#define DRV_RELDATE     "04Mar2008"

#define STATION_ADDRESS_HIGH(dev) (((dev)->dev_addr[0] << 8) | \
				   ((dev)->dev_addr[1]))
#define STATION_ADDRESS_LOW(dev)  (((dev)->dev_addr[2] << 24) | \
				   ((dev)->dev_addr[3] << 16) | \
				   ((dev)->dev_addr[4] << 8)  | \
				   ((dev)->dev_addr[5]))

#define MII_CLOCK 1250000 	/* no more than 2.5MHz */

/* the following must be powers of two */
#define KORINA_NUM_RDS	64  /* number of receive descriptors */
#define KORINA_NUM_TDS	64  /* number of transmit descriptors */

/* KORINA_RBSIZE is the hardware's default maximum receive
 * frame size in bytes. Having this hardcoded means that there
 * is no support for MTU sizes greater than 1500. */
#define KORINA_RBSIZE	1536 /* size of one resource buffer = Ether MTU */
#define KORINA_RDS_MASK	(KORINA_NUM_RDS - 1)
#define KORINA_TDS_MASK	(KORINA_NUM_TDS - 1)
#define RD_RING_SIZE 	(KORINA_NUM_RDS * sizeof(struct dma_desc))
#define TD_RING_SIZE	(KORINA_NUM_TDS * sizeof(struct dma_desc))

#define TX_TIMEOUT 	(6000 * HZ / 1000)

enum chain_status { desc_filled, desc_empty };
#define IS_DMA_FINISHED(X)   (((X) & (DMA_DESC_FINI)) != 0)
#define IS_DMA_DONE(X)   (((X) & (DMA_DESC_DONE)) != 0)
#define RCVPKT_LENGTH(X)     (((X) & ETH_RX_LEN) >> ETH_RX_LEN_BIT)

/* Information that need to be kept for each board. */
struct korina_private {
	struct eth_regs *eth_regs;
	struct dma_reg *rx_dma_regs;
	struct dma_reg *tx_dma_regs;
	struct dma_desc *td_ring; /* transmit descriptor ring */
	struct dma_desc *rd_ring; /* receive descriptor ring  */

	struct sk_buff *tx_skb[KORINA_NUM_TDS];
	struct sk_buff *rx_skb[KORINA_NUM_RDS];

	int rx_next_done;
	int rx_chain_head;
	int rx_chain_tail;
	enum chain_status rx_chain_status;

	int tx_next_done;
	int tx_chain_head;
	int tx_chain_tail;
	enum chain_status tx_chain_status;
	int tx_count;
	int tx_full;

	int rx_irq;
	int tx_irq;
	int ovr_irq;
	int und_irq;

	spinlock_t lock;        /* NIC xmit lock */

	int dma_halt_cnt;
	int dma_run_cnt;
	struct napi_struct napi;
	struct timer_list media_check_timer;
	struct mii_if_info mii_if;
	struct work_struct restart_task;
	struct net_device *dev;
	int phy_addr;
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