drivers/net/bfin_mac.c

/*
 * File:	drivers/net/bfin_mac.c
 * Based on:
 * Maintainer:
 * 		Bryan Wu <bryan.wu@analog.com>
 *
 * Original author:
 * 		Luke Yang <luke.yang@analog.com>
 *
 * Created:
 * Description:
 *
 * Modified:
 * 		2006-12-19 Aidan Williams, multicast hash support
 *		Copyright 2004-2006 Analog Devices Inc.
 *
 * Bugs:	Enter bugs at http://blackfin.uclinux.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, 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 ;  see the file COPYING.
 * If not, write to the Free Software Foundation,
 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/timer.h>
#include <linux/errno.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/crc32.h>
#include <linux/device.h>
#include <linux/spinlock.h>
#include <linux/ethtool.h>
#include <linux/mii.h>
#include <linux/phy.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/platform_device.h>

#include <asm/dma.h>
#include <linux/dma-mapping.h>

#include <asm/blackfin.h>
#include <asm/cacheflush.h>
#include <asm/portmux.h>

#include "bfin_mac.h"

#define DRV_NAME	"bfin_mac"
#define DRV_VERSION	"1.1"
#define DRV_AUTHOR	"Bryan Wu, Luke Yang"
#define DRV_DESC	"Blackfin BF53[67] on-chip Ethernet MAC driver"

MODULE_AUTHOR(DRV_AUTHOR);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION(DRV_DESC);

#if defined(CONFIG_BFIN_MAC_USE_L1)
# define bfin_mac_alloc(dma_handle, size)  l1_data_sram_zalloc(size)
# define bfin_mac_free(dma_handle, ptr)    l1_data_sram_free(ptr)
#else
# define bfin_mac_alloc(dma_handle, size) \
	dma_alloc_coherent(NULL, size, dma_handle, GFP_KERNEL)
# define bfin_mac_free(dma_handle, ptr) \
	dma_free_coherent(NULL, sizeof(*ptr), ptr, dma_handle)
#endif

#define PKT_BUF_SZ 1580

#define MAX_TIMEOUT_CNT	500

/* pointers to maintain transmit list */
static struct net_dma_desc_tx *tx_list_head;
static struct net_dma_desc_tx *tx_list_tail;
static struct net_dma_desc_rx *rx_list_head;
static struct net_dma_desc_rx *rx_list_tail;
static struct net_dma_desc_rx *current_rx_ptr;
static struct net_dma_desc_tx *current_tx_ptr;
static struct net_dma_desc_tx *tx_desc;
static struct net_dma_desc_rx *rx_desc;

static void bf537mac_disable(void);
static void bf537mac_enable(void);

static void desc_list_free(void)
{
	struct net_dma_desc_rx *r;
	struct net_dma_desc_tx *t;
	int i;
#if !defined(CONFIG_BFIN_MAC_USE_L1)
	dma_addr_t dma_handle = 0;
#endif

	if (tx_desc) {
		t = tx_list_head;
		for (i = 0; i < CONFIG_BFIN_TX_DESC_NUM; i++) {
			if (t) {
				if (t->skb) {
					dev_kfree_skb(t->skb);
					t->skb = NULL;
				}
				t = t->next;
			}
		}
		bfin_mac_free(dma_handle, tx_desc);
	}

	if (rx_desc) {
		r = rx_list_head;
		for (i = 0; i < CONFIG_BFIN_RX_DESC_NUM; i++) {
			if (r) {
				if (r->skb) {
					dev_kfree_skb(r->skb);
					r->skb = NULL;
				}
				r = r->next;
			}
		}
		bfin_mac_free(dma_handle, rx_desc);
	}
}

static int desc_list_init(void)
{
	int i;
	struct sk_buff *new_skb;
#if !defined(CONFIG_BFIN_MAC_USE_L1)
	/*
	 * This dma_handle is useless in Blackfin dma_alloc_coherent().
	 * The real dma handler is the return value of dma_alloc_coherent().
	 */
	dma_addr_t dma_handle;
#endif

	tx_desc = bfin_mac_alloc(&dma_handle,
				sizeof(struct net_dma_desc_tx) *
				CONFIG_BFIN_TX_DESC_NUM);
	if (tx_desc == NULL)
		goto init_error;

	rx_desc = bfin_mac_alloc(&dma_handle,
				sizeof(struct net_dma_desc_rx) *
				CONFIG_BFIN_RX_DESC_NUM);
	if (rx_desc == NULL)
		goto init_error;

	/* init tx_list */
	tx_list_head = tx_list_tail = tx_desc;

	for (i = 0; i < CONFIG_BFIN_TX_DESC_NUM; i++) {
		struct net_dma_desc_tx *t = tx_desc + i;
		struct dma_descriptor *a = &(t->desc_a);
		struct dma_descriptor *b = &(t->desc_b);

		/*
		 * disable DMA
		 * read from memory WNR = 0
		 * wordsize is 32 bits
		 * 6 half words is desc size
		 * large desc flow
		 */
		a->config = WDSIZE_32 | NDSIZE_6 | DMAFLOW_LARGE;
		a->start_addr = (unsigned long)t->packet;
		a->x_count = 0;
		a->next_dma_desc = b;

		/*
		 * enabled DMA
		 * write to memory WNR = 1
		 * wordsize is 32 bits
		 * disable interrupt
		 * 6 half words is desc size
		 * large desc flow
		 */
		b->config = DMAEN | WNR | WDSIZE_32 | NDSIZE_6 | DMAFLOW_LARGE;
		b->start_addr = (unsigned long)(&(t->status));
		b->x_count = 0;

		t->skb = NULL;
		tx_list_tail->desc_b.next_dma_desc = a;
		tx_list_tail->next = t;
		tx_list_tail = t;
	}
	tx_list_tail->next = tx_list_head;	/* tx_list is a circle */
	tx_list_tail->desc_b.next_dma_desc = &(tx_list_head->desc_a);
	current_tx_ptr = tx_list_head;

	/* init rx_list */
	rx_list_head = rx_list_tail = rx_desc;

	for (i = 0; i < CONFIG_BFIN_RX_DESC_NUM; i++) {
		struct net_dma_desc_rx *r = rx_desc + i;
		struct dma_descriptor *a = &(r->desc_a);
		struct dma_descriptor *b = &(r->desc_b);

		/* allocate a new skb for next time receive */
		new_skb = dev_alloc_skb(PKT_BUF_SZ + 2);
		if (!new_skb) {
			printk(KERN_NOTICE DRV_NAME
			       ": init: low on mem - packet dropped\n");
			goto init_error;
		}
		skb_reserve(new_skb, 2);
		r->skb = new_skb;

		/*
		 * enabled DMA
		 * write to memory WNR = 1
		 * wordsize is 32 bits
		 * disable interrupt
		 * 6 half words is desc size
		 * large desc flow
		 */
		a->config = DMAEN | WNR | WDSIZE_32 | NDSIZE_6 | DMAFLOW_LARGE;
		/* since RXDWA is enabled */
		a->start_addr = (unsigned long)new_skb->data - 2;
		a->x_count = 0;
		a->next_dma_desc = b;

		/*
		 * enabled DMA
		 * write to memory WNR = 1
		 * wordsize is 32 bits
		 * enable interrupt
		 * 6 half words is desc size
		 * large desc flow
		 */
		b->config = DMAEN | WNR | WDSIZE_32 | DI_EN |
				NDSIZE_6 | DMAFLOW_LARGE;
		b->start_addr = (unsigned long)(&(r->status));
		b->x_count = 0;

		rx_list_tail->desc_b.next_dma_desc = a;
		rx_list_tail->next = r;
		rx_list_tail = r;
	}
	rx_list_tail->next = rx_list_head;	/* rx_list is a circle */
	rx_list_tail->desc_b.next_dma_desc = &(rx_list_head->desc_a);
	current_rx_ptr = rx_list_head;

	return 0;

init_error:
	desc_list_free();
	printk(KERN_ERR DRV_NAME ": kmalloc failed\n");
	return -ENOMEM;
}


/*---PHY CONTROL AND CONFIGURATION-----------------------------------------*/

/* Set FER regs to MUX in Ethernet pins */
static int setup_pin_mux(int action)
{
#if defined(CONFIG_BFIN_MAC_RMII)
	u16 pin_req[] = P_RMII0;
#else
	u16 pin_req[] = P_MII0;
#endif

	if (action) {
		if (peripheral_request_list(pin_req, DRV_NAME)) {
			printk(KERN_ERR DRV_NAME
			": Requesting Peripherals failed\n");
			return -EFAULT;
		}
	} else
		peripheral_free_list(pin_req);

	return 0;
}

/*
 * MII operations
 */
/* Wait until the previous MDC/MDIO transaction has completed */
static void mdio_poll(void)
{
	int timeout_cnt = MAX_TIMEOUT_CNT;

	/* poll the STABUSY bit */
	while ((bfin_read_EMAC_STAADD()) & STABUSY) {
		udelay(1);
		if (timeout_cnt-- < 0) {
			printk(KERN_ERR DRV_NAME
			": wait MDC/MDIO transaction to complete timeout\n");
			break;
		}
	}
}

/* Read an off-chip register in a PHY through the MDC/MDIO port */
static int mdiobus_read(struct mii_bus *bus, int phy_addr, int regnum)
{
	mdio_poll();

	/* read mode */
	bfin_write_EMAC_STAADD(SET_PHYAD((u16) phy_addr) |
				SET_REGAD((u16) regnum) |
				STABUSY);

	mdio_poll();

	return (int) bfin_read_EMAC_STADAT();
}

/* Write an off-chip register in a PHY through the MDC/MDIO port */
static int mdiobus_write(struct mii_bus *bus, int phy_addr, int regnum,
			 u16 value)
{
	mdio_poll();

	bfin_write_EMAC_STADAT((u32) value);

	/* write mode */
	bfin_write_EMAC_STAADD(SET_PHYAD((u16) phy_addr) |
				SET_REGAD((u16) regnum) |
				STAOP |
				STABUSY);

	mdio_poll();

	return 0;
}

static int mdiobus_reset(struct mii_bus *bus)
{
	return 0;
}

static void bf537_adjust_link(struct net_device *dev)
{
	struct bf537mac_local *lp = netdev_priv(dev);
	struct phy_device *phydev = lp->phydev;
	unsigned long flags;
	int new_state = 0;

	spin_lock_irqsave(&lp->lock, flags);
	if (phydev->link) {
		/* Now we make sure that we can be in full duplex mode.
		 * If not, we operate in half-duplex mode. */
		if (phydev->duplex != lp->old_duplex) {
			u32 opmode = bfin_read_EMAC_OPMODE();
			new_state = 1;

			if (phydev->duplex)
				opmode |= FDMODE;
			else
				opmode &= ~(FDMODE);

			bfin_write_EMAC_OPMODE(opmode);
			lp->old_duplex = phydev->duplex;
		}

		if (phydev->speed != lp->old_speed) {
#if defined(CONFIG_BFIN_MAC_RMII)
			u32 opmode = bfin_read_EMAC_OPMODE();
			switch (phydev->speed) {
			case 10:
				opmode |= RMII_10;
				break;
			case 100:
				opmode &= ~(RMII_10);
				break;
			default:
				printk(KERN_WARNING
					"%s: Ack!  Speed (%d) is not 10/100!\n",
					DRV_NAME, phydev->speed);
				break;
			}
			bfin_write_EMAC_OPMODE(opmode);
#endif

			new_state = 1;
			lp->old_speed = phydev->speed;
		}

		if (!lp->old_link) {
			new_state = 1;
			lp->old_link = 1;
			netif_schedule(dev);
		}
	} else if (lp->old_link) {
		new_state = 1;
		lp->old_link = 0;
		lp->old_speed = 0;
		lp->old_duplex = -1;
	}

	if (new_state) {
		u32 opmode = bfin_read_EMAC_OPMODE();
		phy_print_status(phydev);
		pr_debug("EMAC_OPMODE = 0x%08x\n", opmode);
	}

	spin_unlock_irqrestore(&lp->lock, flags);
}

/* MDC  = 2.5 MHz */
#define MDC_CLK 2500000

static int mii_probe(struct net_device *dev)
{
	struct bf537mac_local *lp = netdev_priv(dev);
	struct phy_device *phydev = NULL;
	unsigned short sysctl;
	int i;
	u32 sclk, mdc_div;

	/* Enable PHY output early */
	if (!(bfin_read_VR_CTL() & PHYCLKOE))
		bfin_write_VR_CTL(bfin_read_VR_CTL() | PHYCLKOE);

	sclk = get_sclk();
	mdc_div = ((sclk / MDC_CLK) / 2) - 1;

	sysctl = bfin_read_EMAC_SYSCTL();
	sysctl |= SET_MDCDIV(mdc_div);
	bfin_write_EMAC_SYSCTL(sysctl);

	/* search for connect PHY device */
	for (i = 0; i < PHY_MAX_ADDR; i++) {
		struct phy_device *const tmp_phydev = lp->mii_bus.phy_map[i];

		if (!tmp_phydev)
			continue; /* no PHY here... */

		phydev = tmp_phydev;
		break; /* found it */
	}

	/* now we are supposed to have a proper phydev, to attach to... */
	if (!phydev) {
		printk(KERN_INFO "%s: Don't found any phy device at all\n",
			dev->name);
		return -ENODEV;
	}

#if defined(CONFIG_BFIN_MAC_RMII)
	phydev = phy_connect(dev, phydev->dev.bus_id, &bf537_adjust_link, 0,
			PHY_INTERFACE_MODE_RMII);
#else
	phydev = phy_connect(dev, phydev->dev.bus_id, &bf537_adjust_link, 0,
			PHY_INTERFACE_MODE_MII);
#endif

	if (IS_ERR(phydev)) {
		printk(KERN_ERR "%s: Could not attach to PHY\n", dev->name);
		return PTR_ERR(phydev);
	}

	/* mask with MAC supported features */
	phydev->supported &= (SUPPORTED_10baseT_Half
			      | SUPPORTED_10baseT_Full
			      | SUPPORTED_100baseT_Half
			      | SUPPORTED_100baseT_Full
			      | SUPPORTED_Autoneg
			      | SUPPORTED_Pause | SUPPORTED_Asym_Pause
			      | SUPPORTED_MII
			      | SUPPORTED_TP);

	phydev->advertising = phydev->supported;

	lp->old_link = 0;
	lp->old_speed = 0;
	lp->old_duplex = -1;
	lp->phydev = phydev;

	printk(KERN_INFO "%s: attached PHY driver [%s] "
	       "(mii_bus:phy_addr=%s, irq=%d, mdc_clk=%dHz(mdc_div=%d)"
	       "@sclk=%dMHz)\n",
	       DRV_NAME, phydev->drv->name, phydev->dev.bus_id, phydev->irq,
	       MDC_CLK, mdc_div, sclk/1000000);

	return 0;
}

/**************************************************************************/
void setup_system_regs(struct net_device *dev)
{
	unsigned short sysctl;

	/*
	 * Odd word alignment for Receive Frame DMA word
	 * Configure checksum support and rcve frame word alignment
	 */
	sysctl = bfin_read_EMAC_SYSCTL();
#if defined(BFIN_MAC_CSUM_OFFLOAD)
	sysctl |= RXDWA | RXCKS;
#else
	sysctl |= RXDWA;
#endif
	bfin_write_EMAC_SYSCTL(sysctl);

	bfin_write_EMAC_MMC_CTL(RSTC | CROLL);

	/* Initialize the TX DMA channel registers */
	bfin_write_DMA2_X_COUNT(0);
	bfin_write_DMA2_X_MODIFY(4);
	bfin_write_DMA2_Y_COUNT(0);
	bfin_write_DMA2_Y_MODIFY(0);

	/* Initialize the RX DMA channel registers */
	bfin_write_DMA1_X_COUNT(0);
	bfin_write_DMA1_X_MODIFY(4);
	bfin_write_DMA1_Y_COUNT(0);
	bfin_write_DMA1_Y_MODIFY(0);
}

static void setup_mac_addr(u8 *mac_addr)
{
	u32 addr_low = le32_to_cpu(*(__le32 *) & mac_addr[0]);
	u16 addr_hi = le16_to_cpu(*(__le16 *) & mac_addr[4]);

	/* this depends on a little-endian machine */
	bfin_write_EMAC_ADDRLO(addr_low);
	bfin_write_EMAC_ADDRHI(addr_hi);
}

static int bf537mac_set_mac_address(struct net_device *dev, void *p)
{
	struct sockaddr *addr = p;
	if (netif_running(dev))
		return -EBUSY;
	memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
	setup_mac_addr(dev->dev_addr);
	return 0;
}

static void adjust_tx_list(void)
{
	int timeout_cnt = MAX_TIMEOUT_CNT;

	if (tx_list_head->status.status_word != 0
	    && current_tx_ptr != tx_list_head) {
		goto adjust_head;	/* released something, just return; */
	}

	/*
	 * if nothing released, check wait condition
	 * current's next can not be the head,
	 * otherwise the dma will not stop as we want
	 */
	if (current_tx_ptr->next->next == tx_list_head) {
		while (tx_list_head->status.status_word == 0) {
			mdelay(1);
			if (tx_list_head->status.status_word != 0
			    || !(bfin_read_DMA2_IRQ_STATUS() & 0x08)) {
				goto adjust_head;
			}
			if (timeout_cnt-- < 0) {
				printk(KERN_ERR DRV_NAME
				": wait for adjust tx list head timeout\n");
				break;
			}
		}
		if (tx_list_head->status.status_word != 0) {
			goto adjust_head;
		}
	}

	return;

adjust_head:
	do {
		tx_list_head->desc_a.config &= ~DMAEN;
		tx_list_head->status.status_word = 0;
		if (tx_list_head->skb) {
			dev_kfree_skb(tx_list_head->skb);
			tx_list_head->skb = NULL;
		} else {
			printk(KERN_ERR DRV_NAME
			       ": no sk_buff in a transmitted frame!\n");
		}
		tx_list_head = tx_list_head->next;
	} while (tx_list_head->status.status_word != 0
		 && current_tx_ptr != tx_list_head);
	return;

}

static int bf537mac_hard_start_xmit(struct sk_buff *skb,
				struct net_device *dev)
{
	struct bf537mac_local *lp = netdev_priv(dev);
	unsigned int data;

	current_tx_ptr->skb = skb;

	/*
	 * Is skb->data always 16-bit aligned?
	 * Do we need to memcpy((char *)(tail->packet + 2), skb->data, len)?
	 */
	if ((((unsigned int)(skb->data)) & 0x02) == 2) {
		/* move skb->data to current_tx_ptr payload */
		data = (unsigned int)(skb->data) - 2;
		*((unsigned short *)data) = (unsigned short)(skb->len);
		current_tx_ptr->desc_a.start_addr = (unsigned long)data;
		/* this is important! */
		blackfin_dcache_flush_range(data, (data + (skb->len)) + 2);

	} else {
		*((unsigned short *)(current_tx_ptr->packet)) =
		    (unsigned short)(skb->len);
		memcpy((char *)(current_tx_ptr->packet + 2), skb->data,
		       (skb->len));
		current_tx_ptr->desc_a.start_addr =
		    (unsigned long)current_tx_ptr->packet;
		if (current_tx_ptr->status.status_word != 0)
			current_tx_ptr->status.status_word = 0;
		blackfin_dcache_flush_range((unsigned int)current_tx_ptr->
					    packet,
					    (unsigned int)(current_tx_ptr->
							   packet + skb->len) +
					    2);
	}

	/* enable this packet's dma */
	current_tx_ptr->desc_a.config |= DMAEN;

	/* tx dma is running, just return */
	if (bfin_read_DMA2_IRQ_STATUS() & 0x08)
		goto out;

	/* tx dma is not running */
	bfin_write_DMA2_NEXT_DESC_PTR(&(current_tx_ptr->desc_a));
	/* dma enabled, read from memory, size is 6 */
	bfin_write_DMA2_CONFIG(current_tx_ptr->desc_a.config);
	/* Turn on the EMAC tx */
	bfin_write_EMAC_OPMODE(bfin_read_EMAC_OPMODE() | TE);

out:
	adjust_tx_list();
	current_tx_ptr = current_tx_ptr->next;
	dev->trans_start = jiffies;
	dev->stats.tx_packets++;
	dev->stats.tx_bytes += (skb->len);
	return 0;
}

static void bf537mac_rx(struct net_device *dev)
{
	struct sk_buff *skb, *new_skb;
	struct bf537mac_local *lp = netdev_priv(dev);
	unsigned short len;

	/* allocate a new skb for next time receive */
	skb = current_rx_ptr->skb;
	new_skb = dev_alloc_skb(PKT_BUF_SZ + 2);
	if (!new_skb) {
		printk(KERN_NOTICE DRV_NAME
		       ": rx: low on mem - packet dropped\n");
		dev->stats.rx_dropped++;
		goto out;
	}
	/* reserve 2 bytes for RXDWA padding */
	skb_reserve(new_skb, 2);
	current_rx_ptr->skb = new_skb;
	current_rx_ptr->desc_a.start_addr = (unsigned long)new_skb->data - 2;

	len = (unsigned short)((current_rx_ptr->status.status_word) & RX_FRLEN);
	skb_put(skb, len);
	blackfin_dcache_invalidate_range((unsigned long)skb->head,
					 (unsigned long)skb->tail);

	dev->last_rx = jiffies;
	skb->dev = dev;
	skb->protocol = eth_type_trans(skb, dev);
#if defined(BFIN_MAC_CSUM_OFFLOAD)
	skb->csum = current_rx_ptr->status.ip_payload_csum;
	skb->ip_summed = CHECKSUM_COMPLETE;
#endif

	netif_rx(skb);
	dev->stats.rx_packets++;
	dev->stats.rx_bytes += len;
	current_rx_ptr->status.status_word = 0x00000000;
	current_rx_ptr = current_rx_ptr->next;

out:
	return;
}

/* interrupt routine to handle rx and error signal */
static irqreturn_t bf537mac_interrupt(int irq, void *dev_id)
{
	struct net_device *dev = dev_id;
	int number = 0;

get_one_packet:
	if (current_rx_ptr->status.status_word == 0) {
		/* no more new packet received */
		if (number == 0) {
			if (current_rx_ptr->next->status.status_word != 0) {
				current_rx_ptr = current_rx_ptr->next;
				goto real_rx;
			}
		}
		bfin_write_DMA1_IRQ_STATUS(bfin_read_DMA1_IRQ_STATUS() |
					   DMA_DONE | DMA_ERR);
		return IRQ_HANDLED;
	}

real_rx:
	bf537mac_rx(dev);
	number++;
	goto get_one_packet;
}

#ifdef CONFIG_NET_POLL_CONTROLLER
static void bf537mac_poll(struct net_device *dev)
{
	disable_irq(IRQ_MAC_RX);
	bf537mac_interrupt(IRQ_MAC_RX, dev);
	enable_irq(IRQ_MAC_RX);
}
#endif				/* CONFIG_NET_POLL_CONTROLLER */

static void bf537mac_disable(void)
{
	unsigned int opmode;

	opmode = bfin_read_EMAC_OPMODE();
	opmode &= (~RE);
	opmode &= (~TE);
	/* Turn off the EMAC */
	bfin_write_EMAC_OPMODE(opmode);
}

/*
 * Enable Interrupts, Receive, and Transmit
 */
static void bf537mac_enable(void)
{
	u32 opmode;

	pr_debug("%s: %s\n", DRV_NAME, __FUNCTION__);

	/* Set RX DMA */
	bfin_write_DMA1_NEXT_DESC_PTR(&(rx_list_head->desc_a));
	bfin_write_DMA1_CONFIG(rx_list_head->desc_a.config);

	/* Wait MII done */
	mdio_poll();

	/* We enable only RX here */
	/* ASTP   : Enable Automatic Pad Stripping
	   PR     : Promiscuous Mode for test
	   PSF    : Receive frames with total length less than 64 bytes.
	   FDMODE : Full Duplex Mode
	   LB     : Internal Loopback for test
	   RE     : Receiver Enable */
	opmode = bfin_read_EMAC_OPMODE();
	if (opmode & FDMODE)
		opmode |= PSF;
	else
		opmode |= DRO | DC | PSF;
	opmode |= RE;

#if defined(CONFIG_BFIN_MAC_RMII)
	opmode |= RMII; /* For Now only 100MBit are supported */
#ifdef CONFIG_BF_REV_0_2
	opmode |= TE;
#endif
#endif
	/* Turn on the EMAC rx */
	bfin_write_EMAC_OPMODE(opmode);
}

/* Our watchdog timed out. Called by the networking layer */
static void bf537mac_timeout(struct net_device *dev)
{
	pr_debug("%s: %s\n", dev->name, __FUNCTION__);

	bf537mac_disable();

	/* reset tx queue */
	tx_list_tail = tx_list_head->next;

	bf537mac_enable();

	/* We can accept TX packets again */
	dev->trans_start = jiffies;
	netif_wake_queue(dev);
}

static void bf537mac_multicast_hash(struct net_device *dev)
{
	u32 emac_hashhi, emac_hashlo;
	struct dev_mc_list *dmi = dev->mc_list;
	char *addrs;
	int i;
	u32 crc;

	emac_hashhi = emac_hashlo = 0;

	for (i = 0; i < dev->mc_count; i++) {
		addrs = dmi->dmi_addr;
		dmi = dmi->next;

		/* skip non-multicast addresses */
		if (!(*addrs & 1))
			continue;

		crc = ether_crc(ETH_ALEN, addrs);
		crc >>= 26;

		if (crc & 0x20)
			emac_hashhi |= 1 << (crc & 0x1f);
		else
			emac_hashlo |= 1 << (crc & 0x1f);
	}

	bfin_write_EMAC_HASHHI(emac_hashhi);
	bfin_write_EMAC_HASHLO(emac_hashlo);

	return;
}

/*
 * This routine will, depending on the values passed to it,
 * either make it accept multicast packets, go into
 * promiscuous mode (for TCPDUMP and cousins) or accept
 * a select set of multicast packets
 */
static void bf537mac_set_multicast_list(struct net_device *dev)
{
	u32 sysctl;

	if (dev->flags & IFF_PROMISC) {
		printk(KERN_INFO "%s: set to promisc mode\n", dev->name);
		sysctl = bfin_read_EMAC_OPMODE();
		sysctl |= RAF;
		bfin_write_EMAC_OPMODE(sysctl);
	} else if (dev->flags & IFF_ALLMULTI) {
		/* accept all multicast */
		sysctl = bfin_read_EMAC_OPMODE();
		sysctl |= PAM;
		bfin_write_EMAC_OPMODE(sysctl);
	} else if (dev->mc_count) {
		/* set up multicast hash table */
		sysctl = bfin_read_EMAC_OPMODE();
		sysctl |= HM;
		bfin_write_EMAC_OPMODE(sysctl);
		bf537mac_multicast_hash(dev);
	} else {
		/* clear promisc or multicast mode */
		sysctl = bfin_read_EMAC_OPMODE();
		sysctl &= ~(RAF | PAM);
		bfin_write_EMAC_OPMODE(sysctl);
	}
}

/*
 * this puts the device in an inactive state
 */
static void bf537mac_shutdown(struct net_device *dev)
{
	/* Turn off the EMAC */
	bfin_write_EMAC_OPMODE(0x00000000);
	/* Turn off the EMAC RX DMA */
	bfin_write_DMA1_CONFIG(0x0000);
	bfin_write_DMA2_CONFIG(0x0000);
}

/*
 * Open and Initialize the interface
 *
 * Set up everything, reset the card, etc..
 */
static int bf537mac_open(struct net_device *dev)
{
	struct bf537mac_local *lp = netdev_priv(dev);
	int retval;
	pr_debug("%s: %s\n", dev->name, __FUNCTION__);

	/*
	 * Check that the address is valid.  If its not, refuse
	 * to bring the device up.  The user must specify an
	 * address using ifconfig eth0 hw ether xx:xx:xx:xx:xx:xx
	 */
	if (!is_valid_ether_addr(dev->dev_addr)) {
		printk(KERN_WARNING DRV_NAME ": no valid ethernet hw addr\n");
		return -EINVAL;
	}

	/* initial rx and tx list */
	retval = desc_list_init();

	if (retval)
		return retval;

	phy_start(lp->phydev);
	setup_system_regs(dev);
	bf537mac_disable();
	bf537mac_enable();

	pr_debug("hardware init finished\n");
	netif_start_queue(dev);
	netif_carrier_on(dev);

	return 0;
}

/*
 *
 * this makes the board clean up everything that it can
 * and not talk to the outside world.   Caused by
 * an 'ifconfig ethX down'
 */
static int bf537mac_close(struct net_device *dev)
{
	struct bf537mac_local *lp = netdev_priv(dev);
	pr_debug("%s: %s\n", dev->name, __FUNCTION__);

	netif_stop_queue(dev);
	netif_carrier_off(dev);

	phy_stop(lp->phydev);

	/* clear everything */
	bf537mac_shutdown(dev);

	/* free the rx/tx buffers */
	desc_list_free();

	return 0;
}

static int __init bf537mac_probe(struct net_device *dev)
{
	struct bf537mac_local *lp = netdev_priv(dev);
	int retval;
	int i;

	/* Grab the MAC address in the MAC */
	*(__le32 *) (&(dev->dev_addr[0])) = cpu_to_le32(bfin_read_EMAC_ADDRLO());
	*(__le16 *) (&(dev->dev_addr[4])) = cpu_to_le16((u16) bfin_read_EMAC_ADDRHI());

	/* probe mac */
	/*todo: how to proble? which is revision_register */
	bfin_write_EMAC_ADDRLO(0x12345678);
	if (bfin_read_EMAC_ADDRLO() != 0x12345678) {
		pr_debug("can't detect bf537 mac!\n");
		retval = -ENODEV;
		goto err_out;
	}

	/* set the GPIO pins to Ethernet mode */
	retval = setup_pin_mux(1);
	if (retval)
		return retval;

	/*Is it valid? (Did bootloader initialize it?) */
	if (!is_valid_ether_addr(dev->dev_addr)) {
		/* Grab the MAC from the board somehow - this is done in the
		   arch/blackfin/mach-bf537/boards/eth_mac.c */
		bfin_get_ether_addr(dev->dev_addr);
	}

	/* If still not valid, get a random one */
	if (!is_valid_ether_addr(dev->dev_addr)) {
		random_ether_addr(dev->dev_addr);
	}

	setup_mac_addr(dev->dev_addr);

	/* MDIO bus initial */
	lp->mii_bus.priv = dev;
	lp->mii_bus.read = mdiobus_read;
	lp->mii_bus.write = mdiobus_write;
	lp->mii_bus.reset = mdiobus_reset;
	lp->mii_bus.name = "bfin_mac_mdio";
	lp->mii_bus.id = 0;
	lp->mii_bus.irq = kmalloc(sizeof(int)*PHY_MAX_ADDR, GFP_KERNEL);
	for (i = 0; i < PHY_MAX_ADDR; ++i)
		lp->mii_bus.irq[i] = PHY_POLL;

	mdiobus_register(&lp->mii_bus);

	retval = mii_probe(dev);
	if (retval)
		return retval;

	/* Fill in the fields of the device structure with ethernet values. */
	ether_setup(dev);

	dev->open = bf537mac_open;
	dev->stop = bf537mac_close;
	dev->hard_start_xmit = bf537mac_hard_start_xmit;
	dev->set_mac_address = bf537mac_set_mac_address;
	dev->tx_timeout = bf537mac_timeout;
	dev->set_multicast_list = bf537mac_set_multicast_list;
#ifdef CONFIG_NET_POLL_CONTROLLER
	dev->poll_controller = bf537mac_poll;
#endif

	spin_lock_init(&lp->lock);

	/* now, enable interrupts */
	/* register irq handler */
	if (request_irq
	    (IRQ_MAC_RX, bf537mac_interrupt, IRQF_DISABLED | IRQF_SHARED,
	     "BFIN537_MAC_RX", dev)) {
		printk(KERN_WARNING DRV_NAME
		       ": Unable to attach BlackFin MAC RX interrupt\n");
		return -EBUSY;
	}


	retval = register_netdev(dev);
	if (retval == 0) {
		/* now, print out the card info, in a short format.. */
		printk(KERN_INFO "%s: Version %s, %s\n",
			 DRV_NAME, DRV_VERSION, DRV_DESC);
	}

err_out:
	return retval;
}

static int bfin_mac_probe(struct platform_device *pdev)
{
	struct net_device *ndev;

	ndev = alloc_etherdev(sizeof(struct bf537mac_local));
	if (!ndev) {
		printk(KERN_WARNING DRV_NAME ": could not allocate device\n");
		return -ENOMEM;
	}

	SET_NETDEV_DEV(ndev, &pdev->dev);

	platform_set_drvdata(pdev, ndev);

	if (bf537mac_probe(ndev) != 0) {
		platform_set_drvdata(pdev, NULL);
		free_netdev(ndev);
		printk(KERN_WARNING DRV_NAME ": not found\n");
		return -ENODEV;
	}

	return 0;
}

static int bfin_mac_remove(struct platform_device *pdev)
{
	struct net_device *ndev = platform_get_drvdata(pdev);

	platform_set_drvdata(pdev, NULL);

	unregister_netdev(ndev);

	free_irq(IRQ_MAC_RX, ndev);

	free_netdev(ndev);

	setup_pin_mux(0);

	return 0;
}

#ifdef CONFIG_PM
static int bfin_mac_suspend(struct platform_device *pdev, pm_message_t mesg)
{
	struct net_device *net_dev = platform_get_drvdata(pdev);

	if (netif_running(net_dev))
		bf537mac_close(net_dev);

	return 0;
}

static int bfin_mac_resume(struct platform_device *pdev)
{
	struct net_device *net_dev = platform_get_drvdata(pdev);

	if (netif_running(net_dev))
		bf537mac_open(net_dev);

	return 0;
}
#else
#define bfin_mac_suspend NULL
#define bfin_mac_resume NULL
#endif	/* CONFIG_PM */

static struct platform_driver bfin_mac_driver = {
	.probe = bfin_mac_probe,
	.remove = bfin_mac_remove,
	.resume = bfin_mac_resume,
	.suspend = bfin_mac_suspend,
	.driver = {
		   .name = DRV_NAME,
		   },
};

static int __init bfin_mac_init(void)
{
	return platform_driver_register(&bfin_mac_driver);
}

module_init(bfin_mac_init);

static void __exit bfin_mac_cleanup(void)
{
	platform_driver_unregister(&bfin_mac_driver);
}

module_exit(bfin_mac_cleanup);