macb.c 30.6 KB
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/*
 * Atmel MACB Ethernet Controller driver
 *
 * Copyright (C) 2004-2006 Atmel Corporation
 *
 * 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.
 */

#include <linux/clk.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/dma-mapping.h>
#include <linux/platform_device.h>
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#include <linux/phy.h>
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#include <asm/arch/board.h>
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#include <asm/arch/cpu.h>
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#include "macb.h"

#define RX_BUFFER_SIZE		128
#define RX_RING_SIZE		512
#define RX_RING_BYTES		(sizeof(struct dma_desc) * RX_RING_SIZE)

/* Make the IP header word-aligned (the ethernet header is 14 bytes) */
#define RX_OFFSET		2

#define TX_RING_SIZE		128
#define DEF_TX_RING_PENDING	(TX_RING_SIZE - 1)
#define TX_RING_BYTES		(sizeof(struct dma_desc) * TX_RING_SIZE)

#define TX_RING_GAP(bp)						\
	(TX_RING_SIZE - (bp)->tx_pending)
#define TX_BUFFS_AVAIL(bp)					\
	(((bp)->tx_tail <= (bp)->tx_head) ?			\
	 (bp)->tx_tail + (bp)->tx_pending - (bp)->tx_head :	\
	 (bp)->tx_tail - (bp)->tx_head - TX_RING_GAP(bp))
#define NEXT_TX(n)		(((n) + 1) & (TX_RING_SIZE - 1))

#define NEXT_RX(n)		(((n) + 1) & (RX_RING_SIZE - 1))

/* minimum number of free TX descriptors before waking up TX process */
#define MACB_TX_WAKEUP_THRESH	(TX_RING_SIZE / 4)

#define MACB_RX_INT_FLAGS	(MACB_BIT(RCOMP) | MACB_BIT(RXUBR)	\
				 | MACB_BIT(ISR_ROVR))

static void __macb_set_hwaddr(struct macb *bp)
{
	u32 bottom;
	u16 top;

	bottom = cpu_to_le32(*((u32 *)bp->dev->dev_addr));
	macb_writel(bp, SA1B, bottom);
	top = cpu_to_le16(*((u16 *)(bp->dev->dev_addr + 4)));
	macb_writel(bp, SA1T, top);
}

static void __init macb_get_hwaddr(struct macb *bp)
{
	u32 bottom;
	u16 top;
	u8 addr[6];

	bottom = macb_readl(bp, SA1B);
	top = macb_readl(bp, SA1T);

	addr[0] = bottom & 0xff;
	addr[1] = (bottom >> 8) & 0xff;
	addr[2] = (bottom >> 16) & 0xff;
	addr[3] = (bottom >> 24) & 0xff;
	addr[4] = top & 0xff;
	addr[5] = (top >> 8) & 0xff;

	if (is_valid_ether_addr(addr))
		memcpy(bp->dev->dev_addr, addr, sizeof(addr));
}

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static int macb_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
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{
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	struct macb *bp = bus->priv;
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	int value;

	macb_writel(bp, MAN, (MACB_BF(SOF, MACB_MAN_SOF)
			      | MACB_BF(RW, MACB_MAN_READ)
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			      | MACB_BF(PHYA, mii_id)
			      | MACB_BF(REGA, regnum)
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			      | MACB_BF(CODE, MACB_MAN_CODE)));

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	/* wait for end of transfer */
	while (!MACB_BFEXT(IDLE, macb_readl(bp, NSR)))
		cpu_relax();
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	value = MACB_BFEXT(DATA, macb_readl(bp, MAN));

	return value;
}

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static int macb_mdio_write(struct mii_bus *bus, int mii_id, int regnum,
			   u16 value)
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{
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	struct macb *bp = bus->priv;
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	macb_writel(bp, MAN, (MACB_BF(SOF, MACB_MAN_SOF)
			      | MACB_BF(RW, MACB_MAN_WRITE)
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			      | MACB_BF(PHYA, mii_id)
			      | MACB_BF(REGA, regnum)
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			      | MACB_BF(CODE, MACB_MAN_CODE)
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			      | MACB_BF(DATA, value)));
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	/* wait for end of transfer */
	while (!MACB_BFEXT(IDLE, macb_readl(bp, NSR)))
		cpu_relax();

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

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static void macb_handle_link_change(struct net_device *dev)
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{
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	struct macb *bp = netdev_priv(dev);
	struct phy_device *phydev = bp->phy_dev;
	unsigned long flags;
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	int status_change = 0;
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	spin_lock_irqsave(&bp->lock, flags);

	if (phydev->link) {
		if ((bp->speed != phydev->speed) ||
		    (bp->duplex != phydev->duplex)) {
			u32 reg;

			reg = macb_readl(bp, NCFGR);
			reg &= ~(MACB_BIT(SPD) | MACB_BIT(FD));

			if (phydev->duplex)
				reg |= MACB_BIT(FD);
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			if (phydev->speed == SPEED_100)
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				reg |= MACB_BIT(SPD);

			macb_writel(bp, NCFGR, reg);

			bp->speed = phydev->speed;
			bp->duplex = phydev->duplex;
			status_change = 1;
		}
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	}

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	if (phydev->link != bp->link) {
		if (phydev->link)
			netif_schedule(dev);
		else {
			bp->speed = 0;
			bp->duplex = -1;
		}
		bp->link = phydev->link;
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		status_change = 1;
	}
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	spin_unlock_irqrestore(&bp->lock, flags);

	if (status_change) {
		if (phydev->link)
			printk(KERN_INFO "%s: link up (%d/%s)\n",
			       dev->name, phydev->speed,
			       DUPLEX_FULL == phydev->duplex ? "Full":"Half");
		else
			printk(KERN_INFO "%s: link down\n", dev->name);
	}
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}

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/* based on au1000_eth. c*/
static int macb_mii_probe(struct net_device *dev)
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{
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	struct macb *bp = netdev_priv(dev);
	struct phy_device *phydev = NULL;
	struct eth_platform_data *pdata;
	int phy_addr;
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	/* find the first phy */
	for (phy_addr = 0; phy_addr < PHY_MAX_ADDR; phy_addr++) {
		if (bp->mii_bus.phy_map[phy_addr]) {
			phydev = bp->mii_bus.phy_map[phy_addr];
			break;
		}
	}

	if (!phydev) {
		printk (KERN_ERR "%s: no PHY found\n", dev->name);
		return -1;
	}

	pdata = bp->pdev->dev.platform_data;
	/* TODO : add pin_irq */

	/* attach the mac to the phy */
	if (pdata && pdata->is_rmii) {
		phydev = phy_connect(dev, phydev->dev.bus_id,
			&macb_handle_link_change, 0, PHY_INTERFACE_MODE_RMII);
	} else {
		phydev = phy_connect(dev, phydev->dev.bus_id,
			&macb_handle_link_change, 0, PHY_INTERFACE_MODE_MII);
	}

	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 &= PHY_BASIC_FEATURES;

	phydev->advertising = phydev->supported;

	bp->link = 0;
	bp->speed = 0;
	bp->duplex = -1;
	bp->phy_dev = phydev;

	return 0;
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}

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static int macb_mii_init(struct macb *bp)
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{
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	struct eth_platform_data *pdata;
	int err = -ENXIO, i;
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	/* Enable managment port */
	macb_writel(bp, NCR, MACB_BIT(MPE));
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	bp->mii_bus.name = "MACB_mii_bus",
	bp->mii_bus.read = &macb_mdio_read,
	bp->mii_bus.write = &macb_mdio_write,
	bp->mii_bus.reset = &macb_mdio_reset,
	bp->mii_bus.id = bp->pdev->id,
	bp->mii_bus.priv = bp,
	bp->mii_bus.dev = &bp->dev->dev;
	pdata = bp->pdev->dev.platform_data;
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	if (pdata)
		bp->mii_bus.phy_mask = pdata->phy_mask;
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	bp->mii_bus.irq = kmalloc(sizeof(int)*PHY_MAX_ADDR, GFP_KERNEL);
	if (!bp->mii_bus.irq) {
		err = -ENOMEM;
		goto err_out;
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	}

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	for (i = 0; i < PHY_MAX_ADDR; i++)
		bp->mii_bus.irq[i] = PHY_POLL;
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	platform_set_drvdata(bp->dev, &bp->mii_bus);
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	if (mdiobus_register(&bp->mii_bus))
		goto err_out_free_mdio_irq;
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	if (macb_mii_probe(bp->dev) != 0) {
		goto err_out_unregister_bus;
	}
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	return 0;
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err_out_unregister_bus:
	mdiobus_unregister(&bp->mii_bus);
err_out_free_mdio_irq:
	kfree(bp->mii_bus.irq);
err_out:
	return err;
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}

static void macb_update_stats(struct macb *bp)
{
	u32 __iomem *reg = bp->regs + MACB_PFR;
	u32 *p = &bp->hw_stats.rx_pause_frames;
	u32 *end = &bp->hw_stats.tx_pause_frames + 1;

	WARN_ON((unsigned long)(end - p - 1) != (MACB_TPF - MACB_PFR) / 4);

	for(; p < end; p++, reg++)
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		*p += __raw_readl(reg);
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}

static void macb_tx(struct macb *bp)
{
	unsigned int tail;
	unsigned int head;
	u32 status;

	status = macb_readl(bp, TSR);
	macb_writel(bp, TSR, status);

	dev_dbg(&bp->pdev->dev, "macb_tx status = %02lx\n",
		(unsigned long)status);

	if (status & MACB_BIT(UND)) {
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		int i;
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		printk(KERN_ERR "%s: TX underrun, resetting buffers\n",
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			bp->dev->name);

		head = bp->tx_head;

		/*Mark all the buffer as used to avoid sending a lost buffer*/
		for (i = 0; i < TX_RING_SIZE; i++)
			bp->tx_ring[i].ctrl = MACB_BIT(TX_USED);

		/* free transmit buffer in upper layer*/
		for (tail = bp->tx_tail; tail != head; tail = NEXT_TX(tail)) {
			struct ring_info *rp = &bp->tx_skb[tail];
			struct sk_buff *skb = rp->skb;

			BUG_ON(skb == NULL);

			rmb();

			dma_unmap_single(&bp->pdev->dev, rp->mapping, skb->len,
							 DMA_TO_DEVICE);
			rp->skb = NULL;
			dev_kfree_skb_irq(skb);
		}

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		bp->tx_head = bp->tx_tail = 0;
	}

	if (!(status & MACB_BIT(COMP)))
		/*
		 * This may happen when a buffer becomes complete
		 * between reading the ISR and scanning the
		 * descriptors.  Nothing to worry about.
		 */
		return;

	head = bp->tx_head;
	for (tail = bp->tx_tail; tail != head; tail = NEXT_TX(tail)) {
		struct ring_info *rp = &bp->tx_skb[tail];
		struct sk_buff *skb = rp->skb;
		u32 bufstat;

		BUG_ON(skb == NULL);

		rmb();
		bufstat = bp->tx_ring[tail].ctrl;

		if (!(bufstat & MACB_BIT(TX_USED)))
			break;

		dev_dbg(&bp->pdev->dev, "skb %u (data %p) TX complete\n",
			tail, skb->data);
		dma_unmap_single(&bp->pdev->dev, rp->mapping, skb->len,
				 DMA_TO_DEVICE);
		bp->stats.tx_packets++;
		bp->stats.tx_bytes += skb->len;
		rp->skb = NULL;
		dev_kfree_skb_irq(skb);
	}

	bp->tx_tail = tail;
	if (netif_queue_stopped(bp->dev) &&
	    TX_BUFFS_AVAIL(bp) > MACB_TX_WAKEUP_THRESH)
		netif_wake_queue(bp->dev);
}

static int macb_rx_frame(struct macb *bp, unsigned int first_frag,
			 unsigned int last_frag)
{
	unsigned int len;
	unsigned int frag;
	unsigned int offset = 0;
	struct sk_buff *skb;

	len = MACB_BFEXT(RX_FRMLEN, bp->rx_ring[last_frag].ctrl);

	dev_dbg(&bp->pdev->dev, "macb_rx_frame frags %u - %u (len %u)\n",
		first_frag, last_frag, len);

	skb = dev_alloc_skb(len + RX_OFFSET);
	if (!skb) {
		bp->stats.rx_dropped++;
		for (frag = first_frag; ; frag = NEXT_RX(frag)) {
			bp->rx_ring[frag].addr &= ~MACB_BIT(RX_USED);
			if (frag == last_frag)
				break;
		}
		wmb();
		return 1;
	}

	skb_reserve(skb, RX_OFFSET);
	skb->ip_summed = CHECKSUM_NONE;
	skb_put(skb, len);

	for (frag = first_frag; ; frag = NEXT_RX(frag)) {
		unsigned int frag_len = RX_BUFFER_SIZE;

		if (offset + frag_len > len) {
			BUG_ON(frag != last_frag);
			frag_len = len - offset;
		}
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		skb_copy_to_linear_data_offset(skb, offset,
					       (bp->rx_buffers +
					        (RX_BUFFER_SIZE * frag)),
					       frag_len);
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		offset += RX_BUFFER_SIZE;
		bp->rx_ring[frag].addr &= ~MACB_BIT(RX_USED);
		wmb();

		if (frag == last_frag)
			break;
	}

	skb->protocol = eth_type_trans(skb, bp->dev);

	bp->stats.rx_packets++;
	bp->stats.rx_bytes += len;
	bp->dev->last_rx = jiffies;
	dev_dbg(&bp->pdev->dev, "received skb of length %u, csum: %08x\n",
		skb->len, skb->csum);
	netif_receive_skb(skb);

	return 0;
}

/* Mark DMA descriptors from begin up to and not including end as unused */
static void discard_partial_frame(struct macb *bp, unsigned int begin,
				  unsigned int end)
{
	unsigned int frag;

	for (frag = begin; frag != end; frag = NEXT_RX(frag))
		bp->rx_ring[frag].addr &= ~MACB_BIT(RX_USED);
	wmb();

	/*
	 * When this happens, the hardware stats registers for
	 * whatever caused this is updated, so we don't have to record
	 * anything.
	 */
}

static int macb_rx(struct macb *bp, int budget)
{
	int received = 0;
	unsigned int tail = bp->rx_tail;
	int first_frag = -1;

	for (; budget > 0; tail = NEXT_RX(tail)) {
		u32 addr, ctrl;

		rmb();
		addr = bp->rx_ring[tail].addr;
		ctrl = bp->rx_ring[tail].ctrl;

		if (!(addr & MACB_BIT(RX_USED)))
			break;

		if (ctrl & MACB_BIT(RX_SOF)) {
			if (first_frag != -1)
				discard_partial_frame(bp, first_frag, tail);
			first_frag = tail;
		}

		if (ctrl & MACB_BIT(RX_EOF)) {
			int dropped;
			BUG_ON(first_frag == -1);

			dropped = macb_rx_frame(bp, first_frag, tail);
			first_frag = -1;
			if (!dropped) {
				received++;
				budget--;
			}
		}
	}

	if (first_frag != -1)
		bp->rx_tail = first_frag;
	else
		bp->rx_tail = tail;

	return received;
}

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static int macb_poll(struct napi_struct *napi, int budget)
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{
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	struct macb *bp = container_of(napi, struct macb, napi);
	struct net_device *dev = bp->dev;
	int work_done;
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	u32 status;

	status = macb_readl(bp, RSR);
	macb_writel(bp, RSR, status);

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	work_done = 0;
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	if (!status) {
		/*
		 * This may happen if an interrupt was pending before
		 * this function was called last time, and no packets
		 * have been received since.
		 */
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		netif_rx_complete(dev, napi);
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		goto out;
	}

	dev_dbg(&bp->pdev->dev, "poll: status = %08lx, budget = %d\n",
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		(unsigned long)status, budget);
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	if (!(status & MACB_BIT(REC))) {
		dev_warn(&bp->pdev->dev,
			 "No RX buffers complete, status = %02lx\n",
			 (unsigned long)status);
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		netif_rx_complete(dev, napi);
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		goto out;
	}

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	work_done = macb_rx(bp, budget);
	if (work_done < budget)
		netif_rx_complete(dev, napi);
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	/*
	 * We've done what we can to clean the buffers. Make sure we
	 * get notified when new packets arrive.
	 */
out:
	macb_writel(bp, IER, MACB_RX_INT_FLAGS);

	/* TODO: Handle errors */

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	return work_done;
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}

static irqreturn_t macb_interrupt(int irq, void *dev_id)
{
	struct net_device *dev = dev_id;
	struct macb *bp = netdev_priv(dev);
	u32 status;

	status = macb_readl(bp, ISR);

	if (unlikely(!status))
		return IRQ_NONE;

	spin_lock(&bp->lock);

	while (status) {
		/* close possible race with dev_close */
		if (unlikely(!netif_running(dev))) {
			macb_writel(bp, IDR, ~0UL);
			break;
		}

		if (status & MACB_RX_INT_FLAGS) {
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			if (netif_rx_schedule_prep(dev, &bp->napi)) {
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				/*
				 * There's no point taking any more interrupts
				 * until we have processed the buffers
				 */
				macb_writel(bp, IDR, MACB_RX_INT_FLAGS);
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				dev_dbg(&bp->pdev->dev,
					"scheduling RX softirq\n");
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				__netif_rx_schedule(dev, &bp->napi);
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			}
		}

		if (status & (MACB_BIT(TCOMP) | MACB_BIT(ISR_TUND)))
			macb_tx(bp);

		/*
		 * Link change detection isn't possible with RMII, so we'll
		 * add that if/when we get our hands on a full-blown MII PHY.
		 */

		if (status & MACB_BIT(HRESP)) {
			/*
			 * TODO: Reset the hardware, and maybe move the printk
			 * to a lower-priority context as well (work queue?)
			 */
			printk(KERN_ERR "%s: DMA bus error: HRESP not OK\n",
			       dev->name);
		}

		status = macb_readl(bp, ISR);
	}

	spin_unlock(&bp->lock);

	return IRQ_HANDLED;
}

static int macb_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
	struct macb *bp = netdev_priv(dev);
	dma_addr_t mapping;
	unsigned int len, entry;
	u32 ctrl;

#ifdef DEBUG
	int i;
	dev_dbg(&bp->pdev->dev,
		"start_xmit: len %u head %p data %p tail %p end %p\n",
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		skb->len, skb->head, skb->data,
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		skb_tail_pointer(skb), skb_end_pointer(skb));
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	dev_dbg(&bp->pdev->dev,
		"data:");
	for (i = 0; i < 16; i++)
		printk(" %02x", (unsigned int)skb->data[i]);
	printk("\n");
#endif

	len = skb->len;
	spin_lock_irq(&bp->lock);

	/* This is a hard error, log it. */
	if (TX_BUFFS_AVAIL(bp) < 1) {
		netif_stop_queue(dev);
		spin_unlock_irq(&bp->lock);
		dev_err(&bp->pdev->dev,
			"BUG! Tx Ring full when queue awake!\n");
		dev_dbg(&bp->pdev->dev, "tx_head = %u, tx_tail = %u\n",
			bp->tx_head, bp->tx_tail);
		return 1;
	}

	entry = bp->tx_head;
	dev_dbg(&bp->pdev->dev, "Allocated ring entry %u\n", entry);
	mapping = dma_map_single(&bp->pdev->dev, skb->data,
				 len, DMA_TO_DEVICE);
	bp->tx_skb[entry].skb = skb;
	bp->tx_skb[entry].mapping = mapping;
	dev_dbg(&bp->pdev->dev, "Mapped skb data %p to DMA addr %08lx\n",
		skb->data, (unsigned long)mapping);

	ctrl = MACB_BF(TX_FRMLEN, len);
	ctrl |= MACB_BIT(TX_LAST);
	if (entry == (TX_RING_SIZE - 1))
		ctrl |= MACB_BIT(TX_WRAP);

	bp->tx_ring[entry].addr = mapping;
	bp->tx_ring[entry].ctrl = ctrl;
	wmb();

	entry = NEXT_TX(entry);
	bp->tx_head = entry;

	macb_writel(bp, NCR, macb_readl(bp, NCR) | MACB_BIT(TSTART));

	if (TX_BUFFS_AVAIL(bp) < 1)
		netif_stop_queue(dev);

	spin_unlock_irq(&bp->lock);

	dev->trans_start = jiffies;

	return 0;
}

static void macb_free_consistent(struct macb *bp)
{
	if (bp->tx_skb) {
		kfree(bp->tx_skb);
		bp->tx_skb = NULL;
	}
	if (bp->rx_ring) {
		dma_free_coherent(&bp->pdev->dev, RX_RING_BYTES,
				  bp->rx_ring, bp->rx_ring_dma);
		bp->rx_ring = NULL;
	}
	if (bp->tx_ring) {
		dma_free_coherent(&bp->pdev->dev, TX_RING_BYTES,
				  bp->tx_ring, bp->tx_ring_dma);
		bp->tx_ring = NULL;
	}
	if (bp->rx_buffers) {
		dma_free_coherent(&bp->pdev->dev,
				  RX_RING_SIZE * RX_BUFFER_SIZE,
				  bp->rx_buffers, bp->rx_buffers_dma);
		bp->rx_buffers = NULL;
	}
}

static int macb_alloc_consistent(struct macb *bp)
{
	int size;

	size = TX_RING_SIZE * sizeof(struct ring_info);
	bp->tx_skb = kmalloc(size, GFP_KERNEL);
	if (!bp->tx_skb)
		goto out_err;

	size = RX_RING_BYTES;
	bp->rx_ring = dma_alloc_coherent(&bp->pdev->dev, size,
					 &bp->rx_ring_dma, GFP_KERNEL);
	if (!bp->rx_ring)
		goto out_err;
	dev_dbg(&bp->pdev->dev,
		"Allocated RX ring of %d bytes at %08lx (mapped %p)\n",
		size, (unsigned long)bp->rx_ring_dma, bp->rx_ring);

	size = TX_RING_BYTES;
	bp->tx_ring = dma_alloc_coherent(&bp->pdev->dev, size,
					 &bp->tx_ring_dma, GFP_KERNEL);
	if (!bp->tx_ring)
		goto out_err;
	dev_dbg(&bp->pdev->dev,
		"Allocated TX ring of %d bytes at %08lx (mapped %p)\n",
		size, (unsigned long)bp->tx_ring_dma, bp->tx_ring);

	size = RX_RING_SIZE * RX_BUFFER_SIZE;
	bp->rx_buffers = dma_alloc_coherent(&bp->pdev->dev, size,
					    &bp->rx_buffers_dma, GFP_KERNEL);
	if (!bp->rx_buffers)
		goto out_err;
	dev_dbg(&bp->pdev->dev,
		"Allocated RX buffers of %d bytes at %08lx (mapped %p)\n",
		size, (unsigned long)bp->rx_buffers_dma, bp->rx_buffers);

	return 0;

out_err:
	macb_free_consistent(bp);
	return -ENOMEM;
}

static void macb_init_rings(struct macb *bp)
{
	int i;
	dma_addr_t addr;

	addr = bp->rx_buffers_dma;
	for (i = 0; i < RX_RING_SIZE; i++) {
		bp->rx_ring[i].addr = addr;
		bp->rx_ring[i].ctrl = 0;
		addr += RX_BUFFER_SIZE;
	}
	bp->rx_ring[RX_RING_SIZE - 1].addr |= MACB_BIT(RX_WRAP);

	for (i = 0; i < TX_RING_SIZE; i++) {
		bp->tx_ring[i].addr = 0;
		bp->tx_ring[i].ctrl = MACB_BIT(TX_USED);
	}
	bp->tx_ring[TX_RING_SIZE - 1].ctrl |= MACB_BIT(TX_WRAP);

	bp->rx_tail = bp->tx_head = bp->tx_tail = 0;
}

static void macb_reset_hw(struct macb *bp)
{
	/* Make sure we have the write buffer for ourselves */
	wmb();

	/*
	 * Disable RX and TX (XXX: Should we halt the transmission
	 * more gracefully?)
	 */
	macb_writel(bp, NCR, 0);

	/* Clear the stats registers (XXX: Update stats first?) */
	macb_writel(bp, NCR, MACB_BIT(CLRSTAT));

	/* Clear all status flags */
	macb_writel(bp, TSR, ~0UL);
	macb_writel(bp, RSR, ~0UL);

	/* Disable all interrupts */
	macb_writel(bp, IDR, ~0UL);
	macb_readl(bp, ISR);
}

static void macb_init_hw(struct macb *bp)
{
	u32 config;

	macb_reset_hw(bp);
	__macb_set_hwaddr(bp);

	config = macb_readl(bp, NCFGR) & MACB_BF(CLK, -1L);
	config |= MACB_BIT(PAE);		/* PAuse Enable */
	config |= MACB_BIT(DRFCS);		/* Discard Rx FCS */
	if (bp->dev->flags & IFF_PROMISC)
		config |= MACB_BIT(CAF);	/* Copy All Frames */
	if (!(bp->dev->flags & IFF_BROADCAST))
		config |= MACB_BIT(NBC);	/* No BroadCast */
	macb_writel(bp, NCFGR, config);

	/* Initialize TX and RX buffers */
	macb_writel(bp, RBQP, bp->rx_ring_dma);
	macb_writel(bp, TBQP, bp->tx_ring_dma);

	/* Enable TX and RX */
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frederic RODO 已提交
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	macb_writel(bp, NCR, MACB_BIT(RE) | MACB_BIT(TE) | MACB_BIT(MPE));
803 804 805 806 807 808 809 810 811 812 813 814 815

	/* Enable interrupts */
	macb_writel(bp, IER, (MACB_BIT(RCOMP)
			      | MACB_BIT(RXUBR)
			      | MACB_BIT(ISR_TUND)
			      | MACB_BIT(ISR_RLE)
			      | MACB_BIT(TXERR)
			      | MACB_BIT(TCOMP)
			      | MACB_BIT(ISR_ROVR)
			      | MACB_BIT(HRESP)));

}

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Patrice Vilchez 已提交
816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934
/*
 * The hash address register is 64 bits long and takes up two
 * locations in the memory map.  The least significant bits are stored
 * in EMAC_HSL and the most significant bits in EMAC_HSH.
 *
 * The unicast hash enable and the multicast hash enable bits in the
 * network configuration register enable the reception of hash matched
 * frames. The destination address is reduced to a 6 bit index into
 * the 64 bit hash register using the following hash function.  The
 * hash function is an exclusive or of every sixth bit of the
 * destination address.
 *
 * hi[5] = da[5] ^ da[11] ^ da[17] ^ da[23] ^ da[29] ^ da[35] ^ da[41] ^ da[47]
 * hi[4] = da[4] ^ da[10] ^ da[16] ^ da[22] ^ da[28] ^ da[34] ^ da[40] ^ da[46]
 * hi[3] = da[3] ^ da[09] ^ da[15] ^ da[21] ^ da[27] ^ da[33] ^ da[39] ^ da[45]
 * hi[2] = da[2] ^ da[08] ^ da[14] ^ da[20] ^ da[26] ^ da[32] ^ da[38] ^ da[44]
 * hi[1] = da[1] ^ da[07] ^ da[13] ^ da[19] ^ da[25] ^ da[31] ^ da[37] ^ da[43]
 * hi[0] = da[0] ^ da[06] ^ da[12] ^ da[18] ^ da[24] ^ da[30] ^ da[36] ^ da[42]
 *
 * da[0] represents the least significant bit of the first byte
 * received, that is, the multicast/unicast indicator, and da[47]
 * represents the most significant bit of the last byte received.  If
 * the hash index, hi[n], points to a bit that is set in the hash
 * register then the frame will be matched according to whether the
 * frame is multicast or unicast.  A multicast match will be signalled
 * if the multicast hash enable bit is set, da[0] is 1 and the hash
 * index points to a bit set in the hash register.  A unicast match
 * will be signalled if the unicast hash enable bit is set, da[0] is 0
 * and the hash index points to a bit set in the hash register.  To
 * receive all multicast frames, the hash register should be set with
 * all ones and the multicast hash enable bit should be set in the
 * network configuration register.
 */

static inline int hash_bit_value(int bitnr, __u8 *addr)
{
	if (addr[bitnr / 8] & (1 << (bitnr % 8)))
		return 1;
	return 0;
}

/*
 * Return the hash index value for the specified address.
 */
static int hash_get_index(__u8 *addr)
{
	int i, j, bitval;
	int hash_index = 0;

	for (j = 0; j < 6; j++) {
		for (i = 0, bitval = 0; i < 8; i++)
			bitval ^= hash_bit_value(i*6 + j, addr);

		hash_index |= (bitval << j);
	}

	return hash_index;
}

/*
 * Add multicast addresses to the internal multicast-hash table.
 */
static void macb_sethashtable(struct net_device *dev)
{
	struct dev_mc_list *curr;
	unsigned long mc_filter[2];
	unsigned int i, bitnr;
	struct macb *bp = netdev_priv(dev);

	mc_filter[0] = mc_filter[1] = 0;

	curr = dev->mc_list;
	for (i = 0; i < dev->mc_count; i++, curr = curr->next) {
		if (!curr) break;	/* unexpected end of list */

		bitnr = hash_get_index(curr->dmi_addr);
		mc_filter[bitnr >> 5] |= 1 << (bitnr & 31);
	}

	macb_writel(bp, HRB, mc_filter[0]);
	macb_writel(bp, HRT, mc_filter[1]);
}

/*
 * Enable/Disable promiscuous and multicast modes.
 */
static void macb_set_rx_mode(struct net_device *dev)
{
	unsigned long cfg;
	struct macb *bp = netdev_priv(dev);

	cfg = macb_readl(bp, NCFGR);

	if (dev->flags & IFF_PROMISC)
		/* Enable promiscuous mode */
		cfg |= MACB_BIT(CAF);
	else if (dev->flags & (~IFF_PROMISC))
		 /* Disable promiscuous mode */
		cfg &= ~MACB_BIT(CAF);

	if (dev->flags & IFF_ALLMULTI) {
		/* Enable all multicast mode */
		macb_writel(bp, HRB, -1);
		macb_writel(bp, HRT, -1);
		cfg |= MACB_BIT(NCFGR_MTI);
	} else if (dev->mc_count > 0) {
		/* Enable specific multicasts */
		macb_sethashtable(dev);
		cfg |= MACB_BIT(NCFGR_MTI);
	} else if (dev->flags & (~IFF_ALLMULTI)) {
		/* Disable all multicast mode */
		macb_writel(bp, HRB, 0);
		macb_writel(bp, HRT, 0);
		cfg &= ~MACB_BIT(NCFGR_MTI);
	}

	macb_writel(bp, NCFGR, cfg);
}

935 936 937 938 939 940 941
static int macb_open(struct net_device *dev)
{
	struct macb *bp = netdev_priv(dev);
	int err;

	dev_dbg(&bp->pdev->dev, "open\n");

F
frederic RODO 已提交
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	/* if the phy is not yet register, retry later*/
	if (!bp->phy_dev)
		return -EAGAIN;

946 947 948 949 950 951 952 953 954 955 956
	if (!is_valid_ether_addr(dev->dev_addr))
		return -EADDRNOTAVAIL;

	err = macb_alloc_consistent(bp);
	if (err) {
		printk(KERN_ERR
		       "%s: Unable to allocate DMA memory (error %d)\n",
		       dev->name, err);
		return err;
	}

957 958
	napi_enable(&bp->napi);

959 960 961
	macb_init_rings(bp);
	macb_init_hw(bp);

F
frederic RODO 已提交
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	/* schedule a link state check */
	phy_start(bp->phy_dev);
964

F
frederic RODO 已提交
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	netif_start_queue(dev);
966 967 968 969 970 971 972 973 974 975

	return 0;
}

static int macb_close(struct net_device *dev)
{
	struct macb *bp = netdev_priv(dev);
	unsigned long flags;

	netif_stop_queue(dev);
976
	napi_disable(&bp->napi);
977

F
frederic RODO 已提交
978 979 980
	if (bp->phy_dev)
		phy_stop(bp->phy_dev);

981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996
	spin_lock_irqsave(&bp->lock, flags);
	macb_reset_hw(bp);
	netif_carrier_off(dev);
	spin_unlock_irqrestore(&bp->lock, flags);

	macb_free_consistent(bp);

	return 0;
}

static struct net_device_stats *macb_get_stats(struct net_device *dev)
{
	struct macb *bp = netdev_priv(dev);
	struct net_device_stats *nstat = &bp->stats;
	struct macb_stats *hwstat = &bp->hw_stats;

F
frederic RODO 已提交
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	/* read stats from hardware */
	macb_update_stats(bp);

1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036
	/* Convert HW stats into netdevice stats */
	nstat->rx_errors = (hwstat->rx_fcs_errors +
			    hwstat->rx_align_errors +
			    hwstat->rx_resource_errors +
			    hwstat->rx_overruns +
			    hwstat->rx_oversize_pkts +
			    hwstat->rx_jabbers +
			    hwstat->rx_undersize_pkts +
			    hwstat->sqe_test_errors +
			    hwstat->rx_length_mismatch);
	nstat->tx_errors = (hwstat->tx_late_cols +
			    hwstat->tx_excessive_cols +
			    hwstat->tx_underruns +
			    hwstat->tx_carrier_errors);
	nstat->collisions = (hwstat->tx_single_cols +
			     hwstat->tx_multiple_cols +
			     hwstat->tx_excessive_cols);
	nstat->rx_length_errors = (hwstat->rx_oversize_pkts +
				   hwstat->rx_jabbers +
				   hwstat->rx_undersize_pkts +
				   hwstat->rx_length_mismatch);
	nstat->rx_over_errors = hwstat->rx_resource_errors;
	nstat->rx_crc_errors = hwstat->rx_fcs_errors;
	nstat->rx_frame_errors = hwstat->rx_align_errors;
	nstat->rx_fifo_errors = hwstat->rx_overruns;
	/* XXX: What does "missed" mean? */
	nstat->tx_aborted_errors = hwstat->tx_excessive_cols;
	nstat->tx_carrier_errors = hwstat->tx_carrier_errors;
	nstat->tx_fifo_errors = hwstat->tx_underruns;
	/* Don't know about heartbeat or window errors... */

	return nstat;
}

static int macb_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
	struct macb *bp = netdev_priv(dev);
F
frederic RODO 已提交
1037 1038 1039 1040
	struct phy_device *phydev = bp->phy_dev;

	if (!phydev)
		return -ENODEV;
1041

F
frederic RODO 已提交
1042
	return phy_ethtool_gset(phydev, cmd);
1043 1044 1045 1046 1047
}

static int macb_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
	struct macb *bp = netdev_priv(dev);
F
frederic RODO 已提交
1048
	struct phy_device *phydev = bp->phy_dev;
1049

F
frederic RODO 已提交
1050 1051 1052 1053
	if (!phydev)
		return -ENODEV;

	return phy_ethtool_sset(phydev, cmd);
1054 1055
}

F
frederic RODO 已提交
1056 1057
static void macb_get_drvinfo(struct net_device *dev,
			     struct ethtool_drvinfo *info)
1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075
{
	struct macb *bp = netdev_priv(dev);

	strcpy(info->driver, bp->pdev->dev.driver->name);
	strcpy(info->version, "$Revision: 1.14 $");
	strcpy(info->bus_info, bp->pdev->dev.bus_id);
}

static struct ethtool_ops macb_ethtool_ops = {
	.get_settings		= macb_get_settings,
	.set_settings		= macb_set_settings,
	.get_drvinfo		= macb_get_drvinfo,
	.get_link		= ethtool_op_get_link,
};

static int macb_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
{
	struct macb *bp = netdev_priv(dev);
F
frederic RODO 已提交
1076
	struct phy_device *phydev = bp->phy_dev;
1077 1078 1079 1080

	if (!netif_running(dev))
		return -EINVAL;

F
frederic RODO 已提交
1081 1082
	if (!phydev)
		return -ENODEV;
1083

F
frederic RODO 已提交
1084
	return phy_mii_ioctl(phydev, if_mii(rq), cmd);
1085 1086
}

1087
static int __init macb_probe(struct platform_device *pdev)
1088 1089 1090 1091 1092
{
	struct eth_platform_data *pdata;
	struct resource *regs;
	struct net_device *dev;
	struct macb *bp;
F
frederic RODO 已提交
1093
	struct phy_device *phydev;
1094 1095 1096
	unsigned long pclk_hz;
	u32 config;
	int err = -ENXIO;
1097
	DECLARE_MAC_BUF(mac);
1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122

	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!regs) {
		dev_err(&pdev->dev, "no mmio resource defined\n");
		goto err_out;
	}

	err = -ENOMEM;
	dev = alloc_etherdev(sizeof(*bp));
	if (!dev) {
		dev_err(&pdev->dev, "etherdev alloc failed, aborting.\n");
		goto err_out;
	}

	SET_NETDEV_DEV(dev, &pdev->dev);

	/* TODO: Actually, we have some interesting features... */
	dev->features |= 0;

	bp = netdev_priv(dev);
	bp->pdev = pdev;
	bp->dev = dev;

	spin_lock_init(&bp->lock);

A
Andrew Victor 已提交
1123 1124 1125 1126 1127 1128 1129 1130
#if defined(CONFIG_ARCH_AT91)
	bp->pclk = clk_get(&pdev->dev, "macb_clk");
	if (IS_ERR(bp->pclk)) {
		dev_err(&pdev->dev, "failed to get macb_clk\n");
		goto err_out_free_dev;
	}
	clk_enable(bp->pclk);
#else
1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143
	bp->pclk = clk_get(&pdev->dev, "pclk");
	if (IS_ERR(bp->pclk)) {
		dev_err(&pdev->dev, "failed to get pclk\n");
		goto err_out_free_dev;
	}
	bp->hclk = clk_get(&pdev->dev, "hclk");
	if (IS_ERR(bp->hclk)) {
		dev_err(&pdev->dev, "failed to get hclk\n");
		goto err_out_put_pclk;
	}

	clk_enable(bp->pclk);
	clk_enable(bp->hclk);
A
Andrew Victor 已提交
1144
#endif
1145 1146 1147 1148 1149 1150 1151 1152 1153

	bp->regs = ioremap(regs->start, regs->end - regs->start + 1);
	if (!bp->regs) {
		dev_err(&pdev->dev, "failed to map registers, aborting.\n");
		err = -ENOMEM;
		goto err_out_disable_clocks;
	}

	dev->irq = platform_get_irq(pdev, 0);
1154
	err = request_irq(dev->irq, macb_interrupt, IRQF_SAMPLE_RANDOM,
1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166
			  dev->name, dev);
	if (err) {
		printk(KERN_ERR
		       "%s: Unable to request IRQ %d (error %d)\n",
		       dev->name, dev->irq, err);
		goto err_out_iounmap;
	}

	dev->open = macb_open;
	dev->stop = macb_close;
	dev->hard_start_xmit = macb_start_xmit;
	dev->get_stats = macb_get_stats;
P
Patrice Vilchez 已提交
1167
	dev->set_multicast_list = macb_set_rx_mode;
1168
	dev->do_ioctl = macb_ioctl;
1169
	netif_napi_add(dev, &bp->napi, macb_poll, 64);
1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187
	dev->ethtool_ops = &macb_ethtool_ops;

	dev->base_addr = regs->start;

	/* Set MII management clock divider */
	pclk_hz = clk_get_rate(bp->pclk);
	if (pclk_hz <= 20000000)
		config = MACB_BF(CLK, MACB_CLK_DIV8);
	else if (pclk_hz <= 40000000)
		config = MACB_BF(CLK, MACB_CLK_DIV16);
	else if (pclk_hz <= 80000000)
		config = MACB_BF(CLK, MACB_CLK_DIV32);
	else
		config = MACB_BF(CLK, MACB_CLK_DIV64);
	macb_writel(bp, NCFGR, config);

	macb_get_hwaddr(bp);
	pdata = pdev->dev.platform_data;
F
frederic RODO 已提交
1188

1189
	if (pdata && pdata->is_rmii)
A
Andrew Victor 已提交
1190 1191 1192
#if defined(CONFIG_ARCH_AT91)
		macb_writel(bp, USRIO, (MACB_BIT(RMII) | MACB_BIT(CLKEN)) );
#else
1193
		macb_writel(bp, USRIO, 0);
A
Andrew Victor 已提交
1194
#endif
1195
	else
A
Andrew Victor 已提交
1196 1197 1198
#if defined(CONFIG_ARCH_AT91)
		macb_writel(bp, USRIO, MACB_BIT(CLKEN));
#else
1199
		macb_writel(bp, USRIO, MACB_BIT(MII));
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1200
#endif
1201 1202 1203 1204 1205 1206 1207 1208 1209

	bp->tx_pending = DEF_TX_RING_PENDING;

	err = register_netdev(dev);
	if (err) {
		dev_err(&pdev->dev, "Cannot register net device, aborting.\n");
		goto err_out_free_irq;
	}

F
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	if (macb_mii_init(bp) != 0) {
		goto err_out_unregister_netdev;
	}
1213

F
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	platform_set_drvdata(pdev, dev);
1215 1216

	printk(KERN_INFO "%s: Atmel MACB at 0x%08lx irq %d "
1217
	       "(%s)\n",
1218
	       dev->name, dev->base_addr, dev->irq,
1219
	       print_mac(mac, dev->dev_addr));
1220

F
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	phydev = bp->phy_dev;
	printk(KERN_INFO "%s: attached PHY driver [%s] "
		"(mii_bus:phy_addr=%s, irq=%d)\n",
		dev->name, phydev->drv->name, phydev->dev.bus_id, phydev->irq);

1226 1227
	return 0;

F
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err_out_unregister_netdev:
	unregister_netdev(dev);
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err_out_free_irq:
	free_irq(dev->irq, dev);
err_out_iounmap:
	iounmap(bp->regs);
err_out_disable_clocks:
A
Andrew Victor 已提交
1235
#ifndef CONFIG_ARCH_AT91
1236 1237
	clk_disable(bp->hclk);
	clk_put(bp->hclk);
A
Andrew Victor 已提交
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#endif
	clk_disable(bp->pclk);
F
frederic RODO 已提交
1240
#ifndef CONFIG_ARCH_AT91
1241
err_out_put_pclk:
F
frederic RODO 已提交
1242
#endif
1243 1244 1245 1246 1247 1248 1249 1250
	clk_put(bp->pclk);
err_out_free_dev:
	free_netdev(dev);
err_out:
	platform_set_drvdata(pdev, NULL);
	return err;
}

1251
static int __exit macb_remove(struct platform_device *pdev)
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{
	struct net_device *dev;
	struct macb *bp;

	dev = platform_get_drvdata(pdev);

	if (dev) {
		bp = netdev_priv(dev);
F
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		mdiobus_unregister(&bp->mii_bus);
		kfree(bp->mii_bus.irq);
1262 1263 1264
		unregister_netdev(dev);
		free_irq(dev->irq, dev);
		iounmap(bp->regs);
A
Andrew Victor 已提交
1265
#ifndef CONFIG_ARCH_AT91
1266 1267
		clk_disable(bp->hclk);
		clk_put(bp->hclk);
A
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#endif
		clk_disable(bp->pclk);
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		clk_put(bp->pclk);
		free_netdev(dev);
		platform_set_drvdata(pdev, NULL);
	}

	return 0;
}

static struct platform_driver macb_driver = {
1279
	.remove		= __exit_p(macb_remove),
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	.driver		= {
		.name		= "macb",
	},
};

static int __init macb_init(void)
{
1287
	return platform_driver_probe(&macb_driver, macb_probe);
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}

static void __exit macb_exit(void)
{
	platform_driver_unregister(&macb_driver);
}

module_init(macb_init);
module_exit(macb_exit);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Atmel MACB Ethernet driver");
MODULE_AUTHOR("Haavard Skinnemoen <hskinnemoen@atmel.com>");