Initial import

1 files changed, 1230 insertions, 0 deletions

diff --git a/drivers/net/ethernet/korina.c b/drivers/net/ethernet/korina.c
new file mode 100644
index 000000000..d74f5f4e5
--- /dev/null
+++ b/drivers/net/ethernet/korina.c
@@ -0,0 +1,1230 @@
+/*
+ *  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/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/bitops.h>
+#include <asm/pgtable.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;
+};
+
+extern unsigned int idt_cpu_freq;
+
+static inline void korina_start_dma(struct dma_reg *ch, u32 dma_addr)
+{
+	writel(0, &ch->dmandptr);
+	writel(dma_addr, &ch->dmadptr);
+}
+
+static inline void korina_abort_dma(struct net_device *dev,
+					struct dma_reg *ch)
+{
+       if (readl(&ch->dmac) & DMA_CHAN_RUN_BIT) {
+	       writel(0x10, &ch->dmac);
+
+	       while (!(readl(&ch->dmas) & DMA_STAT_HALT))
+		       dev->trans_start = jiffies;
+
+	       writel(0, &ch->dmas);
+       }
+
+       writel(0, &ch->dmadptr);
+       writel(0, &ch->dmandptr);
+}
+
+static inline void korina_chain_dma(struct dma_reg *ch, u32 dma_addr)
+{
+	writel(dma_addr, &ch->dmandptr);
+}
+
+static void korina_abort_tx(struct net_device *dev)
+{
+	struct korina_private *lp = netdev_priv(dev);
+
+	korina_abort_dma(dev, lp->tx_dma_regs);
+}
+
+static void korina_abort_rx(struct net_device *dev)
+{
+	struct korina_private *lp = netdev_priv(dev);
+
+	korina_abort_dma(dev, lp->rx_dma_regs);
+}
+
+static void korina_start_rx(struct korina_private *lp,
+					struct dma_desc *rd)
+{
+	korina_start_dma(lp->rx_dma_regs, CPHYSADDR(rd));
+}
+
+static void korina_chain_rx(struct korina_private *lp,
+					struct dma_desc *rd)
+{
+	korina_chain_dma(lp->rx_dma_regs, CPHYSADDR(rd));
+}
+
+/* transmit packet */
+static int korina_send_packet(struct sk_buff *skb, struct net_device *dev)
+{
+	struct korina_private *lp = netdev_priv(dev);
+	unsigned long flags;
+	u32 length;
+	u32 chain_prev, chain_next;
+	struct dma_desc *td;
+
+	spin_lock_irqsave(&lp->lock, flags);
+
+	td = &lp->td_ring[lp->tx_chain_tail];
+
+	/* stop queue when full, drop pkts if queue already full */
+	if (lp->tx_count >= (KORINA_NUM_TDS - 2)) {
+		lp->tx_full = 1;
+
+		if (lp->tx_count == (KORINA_NUM_TDS - 2))
+			netif_stop_queue(dev);
+		else {
+			dev->stats.tx_dropped++;
+			dev_kfree_skb_any(skb);
+			spin_unlock_irqrestore(&lp->lock, flags);
+
+			return NETDEV_TX_BUSY;
+		}
+	}
+
+	lp->tx_count++;
+
+	lp->tx_skb[lp->tx_chain_tail] = skb;
+
+	length = skb->len;
+	dma_cache_wback((u32)skb->data, skb->len);
+
+	/* Setup the transmit descriptor. */
+	dma_cache_inv((u32) td, sizeof(*td));
+	td->ca = CPHYSADDR(skb->data);
+	chain_prev = (lp->tx_chain_tail - 1) & KORINA_TDS_MASK;
+	chain_next = (lp->tx_chain_tail + 1) & KORINA_TDS_MASK;
+
+	if (readl(&(lp->tx_dma_regs->dmandptr)) == 0) {
+		if (lp->tx_chain_status == desc_empty) {
+			/* Update tail */
+			td->control = DMA_COUNT(length) |
+					DMA_DESC_COF | DMA_DESC_IOF;
+			/* Move tail */
+			lp->tx_chain_tail = chain_next;
+			/* Write to NDPTR */
+			writel(CPHYSADDR(&lp->td_ring[lp->tx_chain_head]),
+					&lp->tx_dma_regs->dmandptr);
+			/* Move head to tail */
+			lp->tx_chain_head = lp->tx_chain_tail;
+		} else {
+			/* Update tail */
+			td->control = DMA_COUNT(length) |
+					DMA_DESC_COF | DMA_DESC_IOF;
+			/* Link to prev */
+			lp->td_ring[chain_prev].control &=
+					~DMA_DESC_COF;
+			/* Link to prev */
+			lp->td_ring[chain_prev].link =  CPHYSADDR(td);
+			/* Move tail */
+			lp->tx_chain_tail = chain_next;
+			/* Write to NDPTR */
+			writel(CPHYSADDR(&lp->td_ring[lp->tx_chain_head]),
+					&(lp->tx_dma_regs->dmandptr));
+			/* Move head to tail */
+			lp->tx_chain_head = lp->tx_chain_tail;
+			lp->tx_chain_status = desc_empty;
+		}
+	} else {
+		if (lp->tx_chain_status == desc_empty) {
+			/* Update tail */
+			td->control = DMA_COUNT(length) |
+					DMA_DESC_COF | DMA_DESC_IOF;
+			/* Move tail */
+			lp->tx_chain_tail = chain_next;
+			lp->tx_chain_status = desc_filled;
+		} else {
+			/* Update tail */
+			td->control = DMA_COUNT(length) |
+					DMA_DESC_COF | DMA_DESC_IOF;
+			lp->td_ring[chain_prev].control &=
+					~DMA_DESC_COF;
+			lp->td_ring[chain_prev].link =  CPHYSADDR(td);
+			lp->tx_chain_tail = chain_next;
+		}
+	}
+	dma_cache_wback((u32) td, sizeof(*td));
+
+	dev->trans_start = jiffies;
+	spin_unlock_irqrestore(&lp->lock, flags);
+
+	return NETDEV_TX_OK;
+}
+
+static int mdio_read(struct net_device *dev, int mii_id, int reg)
+{
+	struct korina_private *lp = netdev_priv(dev);
+	int ret;
+
+	mii_id = ((lp->rx_irq == 0x2c ? 1 : 0) << 8);
+
+	writel(0, &lp->eth_regs->miimcfg);
+	writel(0, &lp->eth_regs->miimcmd);
+	writel(mii_id | reg, &lp->eth_regs->miimaddr);
+	writel(ETH_MII_CMD_SCN, &lp->eth_regs->miimcmd);
+
+	ret = (int)(readl(&lp->eth_regs->miimrdd));
+	return ret;
+}
+
+static void mdio_write(struct net_device *dev, int mii_id, int reg, int val)
+{
+	struct korina_private *lp = netdev_priv(dev);
+
+	mii_id = ((lp->rx_irq == 0x2c ? 1 : 0) << 8);
+
+	writel(0, &lp->eth_regs->miimcfg);
+	writel(1, &lp->eth_regs->miimcmd);
+	writel(mii_id | reg, &lp->eth_regs->miimaddr);
+	writel(ETH_MII_CMD_SCN, &lp->eth_regs->miimcmd);
+	writel(val, &lp->eth_regs->miimwtd);
+}
+
+/* Ethernet Rx DMA interrupt */
+static irqreturn_t korina_rx_dma_interrupt(int irq, void *dev_id)
+{
+	struct net_device *dev = dev_id;
+	struct korina_private *lp = netdev_priv(dev);
+	u32 dmas, dmasm;
+	irqreturn_t retval;
+
+	dmas = readl(&lp->rx_dma_regs->dmas);
+	if (dmas & (DMA_STAT_DONE | DMA_STAT_HALT | DMA_STAT_ERR)) {
+		dmasm = readl(&lp->rx_dma_regs->dmasm);
+		writel(dmasm | (DMA_STAT_DONE |
+				DMA_STAT_HALT | DMA_STAT_ERR),
+				&lp->rx_dma_regs->dmasm);
+
+		napi_schedule(&lp->napi);
+
+		if (dmas & DMA_STAT_ERR)
+			printk(KERN_ERR "%s: DMA error\n", dev->name);
+
+		retval = IRQ_HANDLED;
+	} else
+		retval = IRQ_NONE;
+
+	return retval;
+}
+
+static int korina_rx(struct net_device *dev, int limit)
+{
+	struct korina_private *lp = netdev_priv(dev);
+	struct dma_desc *rd = &lp->rd_ring[lp->rx_next_done];
+	struct sk_buff *skb, *skb_new;
+	u8 *pkt_buf;
+	u32 devcs, pkt_len, dmas;
+	int count;
+
+	dma_cache_inv((u32)rd, sizeof(*rd));
+
+	for (count = 0; count < limit; count++) {
+		skb = lp->rx_skb[lp->rx_next_done];
+		skb_new = NULL;
+
+		devcs = rd->devcs;
+
+		if ((KORINA_RBSIZE - (u32)DMA_COUNT(rd->control)) == 0)
+			break;
+
+		/* Update statistics counters */
+		if (devcs & ETH_RX_CRC)
+			dev->stats.rx_crc_errors++;
+		if (devcs & ETH_RX_LOR)
+			dev->stats.rx_length_errors++;
+		if (devcs & ETH_RX_LE)
+			dev->stats.rx_length_errors++;
+		if (devcs & ETH_RX_OVR)
+			dev->stats.rx_fifo_errors++;
+		if (devcs & ETH_RX_CV)
+			dev->stats.rx_frame_errors++;
+		if (devcs & ETH_RX_CES)
+			dev->stats.rx_length_errors++;
+		if (devcs & ETH_RX_MP)
+			dev->stats.multicast++;
+
+		if ((devcs & ETH_RX_LD) != ETH_RX_LD) {
+			/* check that this is a whole packet
+			 * WARNING: DMA_FD bit incorrectly set
+			 * in Rc32434 (errata ref #077) */
+			dev->stats.rx_errors++;
+			dev->stats.rx_dropped++;
+		} else if ((devcs & ETH_RX_ROK)) {
+			pkt_len = RCVPKT_LENGTH(devcs);
+
+			/* must be the (first and) last
+			 * descriptor then */
+			pkt_buf = (u8 *)lp->rx_skb[lp->rx_next_done]->data;
+
+			/* invalidate the cache */
+			dma_cache_inv((unsigned long)pkt_buf, pkt_len - 4);
+
+			/* Malloc up new buffer. */
+			skb_new = netdev_alloc_skb_ip_align(dev, KORINA_RBSIZE);
+
+			if (!skb_new)
+				break;
+			/* Do not count the CRC */
+			skb_put(skb, pkt_len - 4);
+			skb->protocol = eth_type_trans(skb, dev);
+
+			/* Pass the packet to upper layers */
+			netif_receive_skb(skb);
+			dev->stats.rx_packets++;
+			dev->stats.rx_bytes += pkt_len;
+
+			/* Update the mcast stats */
+			if (devcs & ETH_RX_MP)
+				dev->stats.multicast++;
+
+			lp->rx_skb[lp->rx_next_done] = skb_new;
+		}
+
+		rd->devcs = 0;
+
+		/* Restore descriptor's curr_addr */
+		if (skb_new)
+			rd->ca = CPHYSADDR(skb_new->data);
+		else
+			rd->ca = CPHYSADDR(skb->data);
+
+		rd->control = DMA_COUNT(KORINA_RBSIZE) |
+			DMA_DESC_COD | DMA_DESC_IOD;
+		lp->rd_ring[(lp->rx_next_done - 1) &
+			KORINA_RDS_MASK].control &=
+			~DMA_DESC_COD;
+
+		lp->rx_next_done = (lp->rx_next_done + 1) & KORINA_RDS_MASK;
+		dma_cache_wback((u32)rd, sizeof(*rd));
+		rd = &lp->rd_ring[lp->rx_next_done];
+		writel(~DMA_STAT_DONE, &lp->rx_dma_regs->dmas);
+	}
+
+	dmas = readl(&lp->rx_dma_regs->dmas);
+
+	if (dmas & DMA_STAT_HALT) {
+		writel(~(DMA_STAT_HALT | DMA_STAT_ERR),
+				&lp->rx_dma_regs->dmas);
+
+		lp->dma_halt_cnt++;
+		rd->devcs = 0;
+		skb = lp->rx_skb[lp->rx_next_done];
+		rd->ca = CPHYSADDR(skb->data);
+		dma_cache_wback((u32)rd, sizeof(*rd));
+		korina_chain_rx(lp, rd);
+	}
+
+	return count;
+}
+
+static int korina_poll(struct napi_struct *napi, int budget)
+{
+	struct korina_private *lp =
+		container_of(napi, struct korina_private, napi);
+	struct net_device *dev = lp->dev;
+	int work_done;
+
+	work_done = korina_rx(dev, budget);
+	if (work_done < budget) {
+		napi_complete(napi);
+
+		writel(readl(&lp->rx_dma_regs->dmasm) &
+			~(DMA_STAT_DONE | DMA_STAT_HALT | DMA_STAT_ERR),
+			&lp->rx_dma_regs->dmasm);
+	}
+	return work_done;
+}
+
+/*
+ * Set or clear the multicast filter for this adaptor.
+ */
+static void korina_multicast_list(struct net_device *dev)
+{
+	struct korina_private *lp = netdev_priv(dev);
+	unsigned long flags;
+	struct netdev_hw_addr *ha;
+	u32 recognise = ETH_ARC_AB;	/* always accept broadcasts */
+
+	/* Set promiscuous mode */
+	if (dev->flags & IFF_PROMISC)
+		recognise |= ETH_ARC_PRO;
+
+	else if ((dev->flags & IFF_ALLMULTI) || (netdev_mc_count(dev) > 4))
+		/* All multicast and broadcast */
+		recognise |= ETH_ARC_AM;
+
+	/* Build the hash table */
+	if (netdev_mc_count(dev) > 4) {
+		u16 hash_table[4] = { 0 };
+		u32 crc;
+
+		netdev_for_each_mc_addr(ha, dev) {
+			crc = ether_crc_le(6, ha->addr);
+			crc >>= 26;
+			hash_table[crc >> 4] |= 1 << (15 - (crc & 0xf));
+		}
+		/* Accept filtered multicast */
+		recognise |= ETH_ARC_AFM;
+
+		/* Fill the MAC hash tables with their values */
+		writel((u32)(hash_table[1] << 16 | hash_table[0]),
+					&lp->eth_regs->ethhash0);
+		writel((u32)(hash_table[3] << 16 | hash_table[2]),
+					&lp->eth_regs->ethhash1);
+	}
+
+	spin_lock_irqsave(&lp->lock, flags);
+	writel(recognise, &lp->eth_regs->etharc);
+	spin_unlock_irqrestore(&lp->lock, flags);
+}
+
+static void korina_tx(struct net_device *dev)
+{
+	struct korina_private *lp = netdev_priv(dev);
+	struct dma_desc *td = &lp->td_ring[lp->tx_next_done];
+	u32 devcs;
+	u32 dmas;
+
+	spin_lock(&lp->lock);
+
+	/* Process all desc that are done */
+	while (IS_DMA_FINISHED(td->control)) {
+		if (lp->tx_full == 1) {
+			netif_wake_queue(dev);
+			lp->tx_full = 0;
+		}
+
+		devcs = lp->td_ring[lp->tx_next_done].devcs;
+		if ((devcs & (ETH_TX_FD | ETH_TX_LD)) !=
+				(ETH_TX_FD | ETH_TX_LD)) {
+			dev->stats.tx_errors++;
+			dev->stats.tx_dropped++;
+
+			/* Should never happen */
+			printk(KERN_ERR "%s: split tx ignored\n",
+							dev->name);
+		} else if (devcs & ETH_TX_TOK) {
+			dev->stats.tx_packets++;
+			dev->stats.tx_bytes +=
+					lp->tx_skb[lp->tx_next_done]->len;
+		} else {
+			dev->stats.tx_errors++;
+			dev->stats.tx_dropped++;
+
+			/* Underflow */
+			if (devcs & ETH_TX_UND)
+				dev->stats.tx_fifo_errors++;
+
+			/* Oversized frame */
+			if (devcs & ETH_TX_OF)
+				dev->stats.tx_aborted_errors++;
+
+			/* Excessive deferrals */
+			if (devcs & ETH_TX_ED)
+				dev->stats.tx_carrier_errors++;
+
+			/* Collisions: medium busy */
+			if (devcs & ETH_TX_EC)
+				dev->stats.collisions++;
+
+			/* Late collision */
+			if (devcs & ETH_TX_LC)
+				dev->stats.tx_window_errors++;
+		}
+
+		/* We must always free the original skb */
+		if (lp->tx_skb[lp->tx_next_done]) {
+			dev_kfree_skb_any(lp->tx_skb[lp->tx_next_done]);
+			lp->tx_skb[lp->tx_next_done] = NULL;
+		}
+
+		lp->td_ring[lp->tx_next_done].control = DMA_DESC_IOF;
+		lp->td_ring[lp->tx_next_done].devcs = ETH_TX_FD | ETH_TX_LD;
+		lp->td_ring[lp->tx_next_done].link = 0;
+		lp->td_ring[lp->tx_next_done].ca = 0;
+		lp->tx_count--;
+
+		/* Go on to next transmission */
+		lp->tx_next_done = (lp->tx_next_done + 1) & KORINA_TDS_MASK;
+		td = &lp->td_ring[lp->tx_next_done];
+
+	}
+
+	/* Clear the DMA status register */
+	dmas = readl(&lp->tx_dma_regs->dmas);
+	writel(~dmas, &lp->tx_dma_regs->dmas);
+
+	writel(readl(&lp->tx_dma_regs->dmasm) &
+			~(DMA_STAT_FINI | DMA_STAT_ERR),
+			&lp->tx_dma_regs->dmasm);
+
+	spin_unlock(&lp->lock);
+}
+
+static irqreturn_t
+korina_tx_dma_interrupt(int irq, void *dev_id)
+{
+	struct net_device *dev = dev_id;
+	struct korina_private *lp = netdev_priv(dev);
+	u32 dmas, dmasm;
+	irqreturn_t retval;
+
+	dmas = readl(&lp->tx_dma_regs->dmas);
+
+	if (dmas & (DMA_STAT_FINI | DMA_STAT_ERR)) {
+		dmasm = readl(&lp->tx_dma_regs->dmasm);
+		writel(dmasm | (DMA_STAT_FINI | DMA_STAT_ERR),
+				&lp->tx_dma_regs->dmasm);
+
+		korina_tx(dev);
+
+		if (lp->tx_chain_status == desc_filled &&
+			(readl(&(lp->tx_dma_regs->dmandptr)) == 0)) {
+			writel(CPHYSADDR(&lp->td_ring[lp->tx_chain_head]),
+				&(lp->tx_dma_regs->dmandptr));
+			lp->tx_chain_status = desc_empty;
+			lp->tx_chain_head = lp->tx_chain_tail;
+			dev->trans_start = jiffies;
+		}
+		if (dmas & DMA_STAT_ERR)
+			printk(KERN_ERR "%s: DMA error\n", dev->name);
+
+		retval = IRQ_HANDLED;
+	} else
+		retval = IRQ_NONE;
+
+	return retval;
+}
+
+
+static void korina_check_media(struct net_device *dev, unsigned int init_media)
+{
+	struct korina_private *lp = netdev_priv(dev);
+
+	mii_check_media(&lp->mii_if, 0, init_media);
+
+	if (lp->mii_if.full_duplex)
+		writel(readl(&lp->eth_regs->ethmac2) | ETH_MAC2_FD,
+						&lp->eth_regs->ethmac2);
+	else
+		writel(readl(&lp->eth_regs->ethmac2) & ~ETH_MAC2_FD,
+						&lp->eth_regs->ethmac2);
+}
+
+static void korina_poll_media(unsigned long data)
+{
+	struct net_device *dev = (struct net_device *) data;
+	struct korina_private *lp = netdev_priv(dev);
+
+	korina_check_media(dev, 0);
+	mod_timer(&lp->media_check_timer, jiffies + HZ);
+}
+
+static void korina_set_carrier(struct mii_if_info *mii)
+{
+	if (mii->force_media) {
+		/* autoneg is off: Link is always assumed to be up */
+		if (!netif_carrier_ok(mii->dev))
+			netif_carrier_on(mii->dev);
+	} else  /* Let MMI library update carrier status */
+		korina_check_media(mii->dev, 0);
+}
+
+static int korina_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
+{
+	struct korina_private *lp = netdev_priv(dev);
+	struct mii_ioctl_data *data = if_mii(rq);
+	int rc;
+
+	if (!netif_running(dev))
+		return -EINVAL;
+	spin_lock_irq(&lp->lock);
+	rc = generic_mii_ioctl(&lp->mii_if, data, cmd, NULL);
+	spin_unlock_irq(&lp->lock);
+	korina_set_carrier(&lp->mii_if);
+
+	return rc;
+}
+
+/* ethtool helpers */
+static void netdev_get_drvinfo(struct net_device *dev,
+			struct ethtool_drvinfo *info)
+{
+	struct korina_private *lp = netdev_priv(dev);
+
+	strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
+	strlcpy(info->version, DRV_VERSION, sizeof(info->version));
+	strlcpy(info->bus_info, lp->dev->name, sizeof(info->bus_info));
+}
+
+static int netdev_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
+{
+	struct korina_private *lp = netdev_priv(dev);
+	int rc;
+
+	spin_lock_irq(&lp->lock);
+	rc = mii_ethtool_gset(&lp->mii_if, cmd);
+	spin_unlock_irq(&lp->lock);
+
+	return rc;
+}
+
+static int netdev_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
+{
+	struct korina_private *lp = netdev_priv(dev);
+	int rc;
+
+	spin_lock_irq(&lp->lock);
+	rc = mii_ethtool_sset(&lp->mii_if, cmd);
+	spin_unlock_irq(&lp->lock);
+	korina_set_carrier(&lp->mii_if);
+
+	return rc;
+}
+
+static u32 netdev_get_link(struct net_device *dev)
+{
+	struct korina_private *lp = netdev_priv(dev);
+
+	return mii_link_ok(&lp->mii_if);
+}
+
+static const struct ethtool_ops netdev_ethtool_ops = {
+	.get_drvinfo            = netdev_get_drvinfo,
+	.get_settings           = netdev_get_settings,
+	.set_settings           = netdev_set_settings,
+	.get_link               = netdev_get_link,
+};
+
+static int korina_alloc_ring(struct net_device *dev)
+{
+	struct korina_private *lp = netdev_priv(dev);
+	struct sk_buff *skb;
+	int i;
+
+	/* Initialize the transmit descriptors */
+	for (i = 0; i < KORINA_NUM_TDS; i++) {
+		lp->td_ring[i].control = DMA_DESC_IOF;
+		lp->td_ring[i].devcs = ETH_TX_FD | ETH_TX_LD;
+		lp->td_ring[i].ca = 0;
+		lp->td_ring[i].link = 0;
+	}
+	lp->tx_next_done = lp->tx_chain_head = lp->tx_chain_tail =
+			lp->tx_full = lp->tx_count = 0;
+	lp->tx_chain_status = desc_empty;
+
+	/* Initialize the receive descriptors */
+	for (i = 0; i < KORINA_NUM_RDS; i++) {
+		skb = netdev_alloc_skb_ip_align(dev, KORINA_RBSIZE);
+		if (!skb)
+			return -ENOMEM;
+		lp->rx_skb[i] = skb;
+		lp->rd_ring[i].control = DMA_DESC_IOD |
+				DMA_COUNT(KORINA_RBSIZE);
+		lp->rd_ring[i].devcs = 0;
+		lp->rd_ring[i].ca = CPHYSADDR(skb->data);
+		lp->rd_ring[i].link = CPHYSADDR(&lp->rd_ring[i+1]);
+	}
+
+	/* loop back receive descriptors, so the last
+	 * descriptor points to the first one */
+	lp->rd_ring[i - 1].link = CPHYSADDR(&lp->rd_ring[0]);
+	lp->rd_ring[i - 1].control |= DMA_DESC_COD;
+
+	lp->rx_next_done  = 0;
+	lp->rx_chain_head = 0;
+	lp->rx_chain_tail = 0;
+	lp->rx_chain_status = desc_empty;
+
+	return 0;
+}
+
+static void korina_free_ring(struct net_device *dev)
+{
+	struct korina_private *lp = netdev_priv(dev);
+	int i;
+
+	for (i = 0; i < KORINA_NUM_RDS; i++) {
+		lp->rd_ring[i].control = 0;
+		if (lp->rx_skb[i])
+			dev_kfree_skb_any(lp->rx_skb[i]);
+		lp->rx_skb[i] = NULL;
+	}
+
+	for (i = 0; i < KORINA_NUM_TDS; i++) {
+		lp->td_ring[i].control = 0;
+		if (lp->tx_skb[i])
+			dev_kfree_skb_any(lp->tx_skb[i]);
+		lp->tx_skb[i] = NULL;
+	}
+}
+
+/*
+ * Initialize the RC32434 ethernet controller.
+ */
+static int korina_init(struct net_device *dev)
+{
+	struct korina_private *lp = netdev_priv(dev);
+
+	/* Disable DMA */
+	korina_abort_tx(dev);
+	korina_abort_rx(dev);
+
+	/* reset ethernet logic */
+	writel(0, &lp->eth_regs->ethintfc);
+	while ((readl(&lp->eth_regs->ethintfc) & ETH_INT_FC_RIP))
+		dev->trans_start = jiffies;
+
+	/* Enable Ethernet Interface */
+	writel(ETH_INT_FC_EN, &lp->eth_regs->ethintfc);
+
+	/* Allocate rings */
+	if (korina_alloc_ring(dev)) {
+		printk(KERN_ERR "%s: descriptor allocation failed\n", dev->name);
+		korina_free_ring(dev);
+		return -ENOMEM;
+	}
+
+	writel(0, &lp->rx_dma_regs->dmas);
+	/* Start Rx DMA */
+	korina_start_rx(lp, &lp->rd_ring[0]);
+
+	writel(readl(&lp->tx_dma_regs->dmasm) &
+			~(DMA_STAT_FINI | DMA_STAT_ERR),
+			&lp->tx_dma_regs->dmasm);
+	writel(readl(&lp->rx_dma_regs->dmasm) &
+			~(DMA_STAT_DONE | DMA_STAT_HALT | DMA_STAT_ERR),
+			&lp->rx_dma_regs->dmasm);
+
+	/* Accept only packets destined for this Ethernet device address */
+	writel(ETH_ARC_AB, &lp->eth_regs->etharc);
+
+	/* Set all Ether station address registers to their initial values */
+	writel(STATION_ADDRESS_LOW(dev), &lp->eth_regs->ethsal0);
+	writel(STATION_ADDRESS_HIGH(dev), &lp->eth_regs->ethsah0);
+
+	writel(STATION_ADDRESS_LOW(dev), &lp->eth_regs->ethsal1);
+	writel(STATION_ADDRESS_HIGH(dev), &lp->eth_regs->ethsah1);
+
+	writel(STATION_ADDRESS_LOW(dev), &lp->eth_regs->ethsal2);
+	writel(STATION_ADDRESS_HIGH(dev), &lp->eth_regs->ethsah2);
+
+	writel(STATION_ADDRESS_LOW(dev), &lp->eth_regs->ethsal3);
+	writel(STATION_ADDRESS_HIGH(dev), &lp->eth_regs->ethsah3);
+
+
+	/* Frame Length Checking, Pad Enable, CRC Enable, Full Duplex set */
+	writel(ETH_MAC2_PE | ETH_MAC2_CEN | ETH_MAC2_FD,
+			&lp->eth_regs->ethmac2);
+
+	/* Back to back inter-packet-gap */
+	writel(0x15, &lp->eth_regs->ethipgt);
+	/* Non - Back to back inter-packet-gap */
+	writel(0x12, &lp->eth_regs->ethipgr);
+
+	/* Management Clock Prescaler Divisor
+	 * Clock independent setting */
+	writel(((idt_cpu_freq) / MII_CLOCK + 1) & ~1,
+		       &lp->eth_regs->ethmcp);
+
+	/* don't transmit until fifo contains 48b */
+	writel(48, &lp->eth_regs->ethfifott);
+
+	writel(ETH_MAC1_RE, &lp->eth_regs->ethmac1);
+
+	napi_enable(&lp->napi);
+	netif_start_queue(dev);
+
+	return 0;
+}
+
+/*
+ * Restart the RC32434 ethernet controller.
+ */
+static void korina_restart_task(struct work_struct *work)
+{
+	struct korina_private *lp = container_of(work,
+			struct korina_private, restart_task);
+	struct net_device *dev = lp->dev;
+
+	/*
+	 * Disable interrupts
+	 */
+	disable_irq(lp->rx_irq);
+	disable_irq(lp->tx_irq);
+	disable_irq(lp->ovr_irq);
+	disable_irq(lp->und_irq);
+
+	writel(readl(&lp->tx_dma_regs->dmasm) |
+				DMA_STAT_FINI | DMA_STAT_ERR,
+				&lp->tx_dma_regs->dmasm);
+	writel(readl(&lp->rx_dma_regs->dmasm) |
+				DMA_STAT_DONE | DMA_STAT_HALT | DMA_STAT_ERR,
+				&lp->rx_dma_regs->dmasm);
+
+	korina_free_ring(dev);
+
+	napi_disable(&lp->napi);
+
+	if (korina_init(dev) < 0) {
+		printk(KERN_ERR "%s: cannot restart device\n", dev->name);
+		return;
+	}
+	korina_multicast_list(dev);
+
+	enable_irq(lp->und_irq);
+	enable_irq(lp->ovr_irq);
+	enable_irq(lp->tx_irq);
+	enable_irq(lp->rx_irq);
+}
+
+static void korina_clear_and_restart(struct net_device *dev, u32 value)
+{
+	struct korina_private *lp = netdev_priv(dev);
+
+	netif_stop_queue(dev);
+	writel(value, &lp->eth_regs->ethintfc);
+	schedule_work(&lp->restart_task);
+}
+
+/* Ethernet Tx Underflow interrupt */
+static irqreturn_t korina_und_interrupt(int irq, void *dev_id)
+{
+	struct net_device *dev = dev_id;
+	struct korina_private *lp = netdev_priv(dev);
+	unsigned int und;
+
+	spin_lock(&lp->lock);
+
+	und = readl(&lp->eth_regs->ethintfc);
+
+	if (und & ETH_INT_FC_UND)
+		korina_clear_and_restart(dev, und & ~ETH_INT_FC_UND);
+
+	spin_unlock(&lp->lock);
+
+	return IRQ_HANDLED;
+}
+
+static void korina_tx_timeout(struct net_device *dev)
+{
+	struct korina_private *lp = netdev_priv(dev);
+
+	schedule_work(&lp->restart_task);
+}
+
+/* Ethernet Rx Overflow interrupt */
+static irqreturn_t
+korina_ovr_interrupt(int irq, void *dev_id)
+{
+	struct net_device *dev = dev_id;
+	struct korina_private *lp = netdev_priv(dev);
+	unsigned int ovr;
+
+	spin_lock(&lp->lock);
+	ovr = readl(&lp->eth_regs->ethintfc);
+
+	if (ovr & ETH_INT_FC_OVR)
+		korina_clear_and_restart(dev, ovr & ~ETH_INT_FC_OVR);
+
+	spin_unlock(&lp->lock);
+
+	return IRQ_HANDLED;
+}
+
+#ifdef CONFIG_NET_POLL_CONTROLLER
+static void korina_poll_controller(struct net_device *dev)
+{
+	disable_irq(dev->irq);
+	korina_tx_dma_interrupt(dev->irq, dev);
+	enable_irq(dev->irq);
+}
+#endif
+
+static int korina_open(struct net_device *dev)
+{
+	struct korina_private *lp = netdev_priv(dev);
+	int ret;
+
+	/* Initialize */
+	ret = korina_init(dev);
+	if (ret < 0) {
+		printk(KERN_ERR "%s: cannot open device\n", dev->name);
+		goto out;
+	}
+
+	/* Install the interrupt handler
+	 * that handles the Done Finished
+	 * Ovr and Und Events */
+	ret = request_irq(lp->rx_irq, korina_rx_dma_interrupt,
+			0, "Korina ethernet Rx", dev);
+	if (ret < 0) {
+		printk(KERN_ERR "%s: unable to get Rx DMA IRQ %d\n",
+		    dev->name, lp->rx_irq);
+		goto err_release;
+	}
+	ret = request_irq(lp->tx_irq, korina_tx_dma_interrupt,
+			0, "Korina ethernet Tx", dev);
+	if (ret < 0) {
+		printk(KERN_ERR "%s: unable to get Tx DMA IRQ %d\n",
+		    dev->name, lp->tx_irq);
+		goto err_free_rx_irq;
+	}
+
+	/* Install handler for overrun error. */
+	ret = request_irq(lp->ovr_irq, korina_ovr_interrupt,
+			0, "Ethernet Overflow", dev);
+	if (ret < 0) {
+		printk(KERN_ERR "%s: unable to get OVR IRQ %d\n",
+		    dev->name, lp->ovr_irq);
+		goto err_free_tx_irq;
+	}
+
+	/* Install handler for underflow error. */
+	ret = request_irq(lp->und_irq, korina_und_interrupt,
+			0, "Ethernet Underflow", dev);
+	if (ret < 0) {
+		printk(KERN_ERR "%s: unable to get UND IRQ %d\n",
+		    dev->name, lp->und_irq);
+		goto err_free_ovr_irq;
+	}
+	mod_timer(&lp->media_check_timer, jiffies + 1);
+out:
+	return ret;
+
+err_free_ovr_irq:
+	free_irq(lp->ovr_irq, dev);
+err_free_tx_irq:
+	free_irq(lp->tx_irq, dev);
+err_free_rx_irq:
+	free_irq(lp->rx_irq, dev);
+err_release:
+	korina_free_ring(dev);
+	goto out;
+}
+
+static int korina_close(struct net_device *dev)
+{
+	struct korina_private *lp = netdev_priv(dev);
+	u32 tmp;
+
+	del_timer(&lp->media_check_timer);
+
+	/* Disable interrupts */
+	disable_irq(lp->rx_irq);
+	disable_irq(lp->tx_irq);
+	disable_irq(lp->ovr_irq);
+	disable_irq(lp->und_irq);
+
+	korina_abort_tx(dev);
+	tmp = readl(&lp->tx_dma_regs->dmasm);
+	tmp = tmp | DMA_STAT_FINI | DMA_STAT_ERR;
+	writel(tmp, &lp->tx_dma_regs->dmasm);
+
+	korina_abort_rx(dev);
+	tmp = readl(&lp->rx_dma_regs->dmasm);
+	tmp = tmp | DMA_STAT_DONE | DMA_STAT_HALT | DMA_STAT_ERR;
+	writel(tmp, &lp->rx_dma_regs->dmasm);
+
+	korina_free_ring(dev);
+
+	napi_disable(&lp->napi);
+
+	cancel_work_sync(&lp->restart_task);
+
+	free_irq(lp->rx_irq, dev);
+	free_irq(lp->tx_irq, dev);
+	free_irq(lp->ovr_irq, dev);
+	free_irq(lp->und_irq, dev);
+
+	return 0;
+}
+
+static const struct net_device_ops korina_netdev_ops = {
+	.ndo_open		= korina_open,
+	.ndo_stop		= korina_close,
+	.ndo_start_xmit		= korina_send_packet,
+	.ndo_set_rx_mode	= korina_multicast_list,
+	.ndo_tx_timeout		= korina_tx_timeout,
+	.ndo_do_ioctl		= korina_ioctl,
+	.ndo_change_mtu		= eth_change_mtu,
+	.ndo_validate_addr	= eth_validate_addr,
+	.ndo_set_mac_address	= eth_mac_addr,
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	.ndo_poll_controller	= korina_poll_controller,
+#endif
+};
+
+static int korina_probe(struct platform_device *pdev)
+{
+	struct korina_device *bif = platform_get_drvdata(pdev);
+	struct korina_private *lp;
+	struct net_device *dev;
+	struct resource *r;
+	int rc;
+
+	dev = alloc_etherdev(sizeof(struct korina_private));
+	if (!dev)
+		return -ENOMEM;
+
+	SET_NETDEV_DEV(dev, &pdev->dev);
+	lp = netdev_priv(dev);
+
+	bif->dev = dev;
+	memcpy(dev->dev_addr, bif->mac, ETH_ALEN);
+
+	lp->rx_irq = platform_get_irq_byname(pdev, "korina_rx");
+	lp->tx_irq = platform_get_irq_byname(pdev, "korina_tx");
+	lp->ovr_irq = platform_get_irq_byname(pdev, "korina_ovr");
+	lp->und_irq = platform_get_irq_byname(pdev, "korina_und");
+
+	r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "korina_regs");
+	dev->base_addr = r->start;
+	lp->eth_regs = ioremap_nocache(r->start, resource_size(r));
+	if (!lp->eth_regs) {
+		printk(KERN_ERR DRV_NAME ": cannot remap registers\n");
+		rc = -ENXIO;
+		goto probe_err_out;
+	}
+
+	r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "korina_dma_rx");
+	lp->rx_dma_regs = ioremap_nocache(r->start, resource_size(r));
+	if (!lp->rx_dma_regs) {
+		printk(KERN_ERR DRV_NAME ": cannot remap Rx DMA registers\n");
+		rc = -ENXIO;
+		goto probe_err_dma_rx;
+	}
+
+	r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "korina_dma_tx");
+	lp->tx_dma_regs = ioremap_nocache(r->start, resource_size(r));
+	if (!lp->tx_dma_regs) {
+		printk(KERN_ERR DRV_NAME ": cannot remap Tx DMA registers\n");
+		rc = -ENXIO;
+		goto probe_err_dma_tx;
+	}
+
+	lp->td_ring = kmalloc(TD_RING_SIZE + RD_RING_SIZE, GFP_KERNEL);
+	if (!lp->td_ring) {
+		rc = -ENXIO;
+		goto probe_err_td_ring;
+	}
+
+	dma_cache_inv((unsigned long)(lp->td_ring),
+			TD_RING_SIZE + RD_RING_SIZE);
+
+	/* now convert TD_RING pointer to KSEG1 */
+	lp->td_ring = (struct dma_desc *)KSEG1ADDR(lp->td_ring);
+	lp->rd_ring = &lp->td_ring[KORINA_NUM_TDS];
+
+	spin_lock_init(&lp->lock);
+	/* just use the rx dma irq */
+	dev->irq = lp->rx_irq;
+	lp->dev = dev;
+
+	dev->netdev_ops = &korina_netdev_ops;
+	dev->ethtool_ops = &netdev_ethtool_ops;
+	dev->watchdog_timeo = TX_TIMEOUT;
+	netif_napi_add(dev, &lp->napi, korina_poll, 64);
+
+	lp->phy_addr = (((lp->rx_irq == 0x2c? 1:0) << 8) | 0x05);
+	lp->mii_if.dev = dev;
+	lp->mii_if.mdio_read = mdio_read;
+	lp->mii_if.mdio_write = mdio_write;
+	lp->mii_if.phy_id = lp->phy_addr;
+	lp->mii_if.phy_id_mask = 0x1f;
+	lp->mii_if.reg_num_mask = 0x1f;
+
+	rc = register_netdev(dev);
+	if (rc < 0) {
+		printk(KERN_ERR DRV_NAME
+			": cannot register net device: %d\n", rc);
+		goto probe_err_register;
+	}
+	setup_timer(&lp->media_check_timer, korina_poll_media, (unsigned long) dev);
+
+	INIT_WORK(&lp->restart_task, korina_restart_task);
+
+	printk(KERN_INFO "%s: " DRV_NAME "-" DRV_VERSION " " DRV_RELDATE "\n",
+			dev->name);
+out:
+	return rc;
+
+probe_err_register:
+	kfree(lp->td_ring);
+probe_err_td_ring:
+	iounmap(lp->tx_dma_regs);
+probe_err_dma_tx:
+	iounmap(lp->rx_dma_regs);
+probe_err_dma_rx:
+	iounmap(lp->eth_regs);
+probe_err_out:
+	free_netdev(dev);
+	goto out;
+}
+
+static int korina_remove(struct platform_device *pdev)
+{
+	struct korina_device *bif = platform_get_drvdata(pdev);
+	struct korina_private *lp = netdev_priv(bif->dev);
+
+	iounmap(lp->eth_regs);
+	iounmap(lp->rx_dma_regs);
+	iounmap(lp->tx_dma_regs);
+
+	unregister_netdev(bif->dev);
+	free_netdev(bif->dev);
+
+	return 0;
+}
+
+static struct platform_driver korina_driver = {
+	.driver.name = "korina",
+	.probe = korina_probe,
+	.remove = korina_remove,
+};
+
+module_platform_driver(korina_driver);
+
+MODULE_AUTHOR("Philip Rischel <rischelp@idt.com>");
+MODULE_AUTHOR("Felix Fietkau <nbd@openwrt.org>");
+MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
+MODULE_DESCRIPTION("IDT RC32434 (Korina) Ethernet driver");
+MODULE_LICENSE("GPL");