[linux-2.6-block.git] / drivers / net / ks8842.c

/*
 * ks8842_main.c timberdale KS8842 ethernet driver
 * Copyright (c) 2009 Intel 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.
 *
 * 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; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/* Supports:
 * The Micrel KS8842 behind the timberdale FPGA
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>

#define DRV_NAME "ks8842"

/* Timberdale specific Registers */
#define REG_TIMB_RST	0x1c

/* KS8842 registers */

#define REG_SELECT_BANK 0x0e

/* bank 0 registers */
#define REG_QRFCR	0x04

/* bank 2 registers */
#define REG_MARL	0x00
#define REG_MARM	0x02
#define REG_MARH	0x04

/* bank 3 registers */
#define REG_GRR		0x06

/* bank 16 registers */
#define REG_TXCR	0x00
#define REG_TXSR	0x02
#define REG_RXCR	0x04
#define REG_TXMIR	0x08
#define REG_RXMIR	0x0A

/* bank 17 registers */
#define REG_TXQCR	0x00
#define REG_RXQCR	0x02
#define REG_TXFDPR	0x04
#define REG_RXFDPR	0x06
#define REG_QMU_DATA_LO 0x08
#define REG_QMU_DATA_HI 0x0A

/* bank 18 registers */
#define REG_IER		0x00
#define IRQ_LINK_CHANGE	0x8000
#define IRQ_TX		0x4000
#define IRQ_RX		0x2000
#define IRQ_RX_OVERRUN	0x0800
#define IRQ_TX_STOPPED	0x0200
#define IRQ_RX_STOPPED	0x0100
#define IRQ_RX_ERROR	0x0080
#define ENABLED_IRQS	(IRQ_LINK_CHANGE | IRQ_TX | IRQ_RX | IRQ_RX_STOPPED | \
		IRQ_TX_STOPPED | IRQ_RX_OVERRUN | IRQ_RX_ERROR)
#define REG_ISR		0x02
#define REG_RXSR	0x04
#define RXSR_VALID	0x8000
#define RXSR_BROADCAST	0x80
#define RXSR_MULTICAST	0x40
#define RXSR_UNICAST	0x20
#define RXSR_FRAMETYPE	0x08
#define RXSR_TOO_LONG	0x04
#define RXSR_RUNT	0x02
#define RXSR_CRC_ERROR	0x01
#define RXSR_ERROR	(RXSR_TOO_LONG | RXSR_RUNT | RXSR_CRC_ERROR)

/* bank 32 registers */
#define REG_SW_ID_AND_ENABLE	0x00
#define REG_SGCR1		0x02
#define REG_SGCR2		0x04
#define REG_SGCR3		0x06

/* bank 39 registers */
#define REG_MACAR1		0x00
#define REG_MACAR2		0x02
#define REG_MACAR3		0x04

/* bank 45 registers */
#define REG_P1MBCR		0x00
#define REG_P1MBSR		0x02

/* bank 46 registers */
#define REG_P2MBCR		0x00
#define REG_P2MBSR		0x02

/* bank 48 registers */
#define REG_P1CR2		0x02

/* bank 49 registers */
#define REG_P1CR4		0x02
#define REG_P1SR		0x04

struct ks8842_adapter {
	void __iomem	*hw_addr;
	int		irq;
	struct tasklet_struct	tasklet;
	spinlock_t	lock; /* spinlock to be interrupt safe */
	struct platform_device *pdev;
};

static inline void ks8842_select_bank(struct ks8842_adapter *adapter, u16 bank)
{
	iowrite16(bank, adapter->hw_addr + REG_SELECT_BANK);
}

static inline void ks8842_write8(struct ks8842_adapter *adapter, u16 bank,
	u8 value, int offset)
{
	ks8842_select_bank(adapter, bank);
	iowrite8(value, adapter->hw_addr + offset);
}

static inline void ks8842_write16(struct ks8842_adapter *adapter, u16 bank,
	u16 value, int offset)
{
	ks8842_select_bank(adapter, bank);
	iowrite16(value, adapter->hw_addr + offset);
}

static inline void ks8842_enable_bits(struct ks8842_adapter *adapter, u16 bank,
	u16 bits, int offset)
{
	u16 reg;
	ks8842_select_bank(adapter, bank);
	reg = ioread16(adapter->hw_addr + offset);
	reg |= bits;
	iowrite16(reg, adapter->hw_addr + offset);
}

static inline void ks8842_clear_bits(struct ks8842_adapter *adapter, u16 bank,
	u16 bits, int offset)
{
	u16 reg;
	ks8842_select_bank(adapter, bank);
	reg = ioread16(adapter->hw_addr + offset);
	reg &= ~bits;
	iowrite16(reg, adapter->hw_addr + offset);
}

static inline void ks8842_write32(struct ks8842_adapter *adapter, u16 bank,
	u32 value, int offset)
{
	ks8842_select_bank(adapter, bank);
	iowrite32(value, adapter->hw_addr + offset);
}

static inline u8 ks8842_read8(struct ks8842_adapter *adapter, u16 bank,
	int offset)
{
	ks8842_select_bank(adapter, bank);
	return ioread8(adapter->hw_addr + offset);
}

static inline u16 ks8842_read16(struct ks8842_adapter *adapter, u16 bank,
	int offset)
{
	ks8842_select_bank(adapter, bank);
	return ioread16(adapter->hw_addr + offset);
}

static inline u32 ks8842_read32(struct ks8842_adapter *adapter, u16 bank,
	int offset)
{
	ks8842_select_bank(adapter, bank);
	return ioread32(adapter->hw_addr + offset);
}

static void ks8842_reset(struct ks8842_adapter *adapter)
{
	/* The KS8842 goes haywire when doing softare reset
	 * a work around in the timberdale IP is implemented to
	 * do a hardware reset instead
	ks8842_write16(adapter, 3, 1, REG_GRR);
	msleep(10);
	iowrite16(0, adapter->hw_addr + REG_GRR);
	*/
	iowrite16(32, adapter->hw_addr + REG_SELECT_BANK);
	iowrite32(0x1, adapter->hw_addr + REG_TIMB_RST);
	msleep(20);
}

static void ks8842_update_link_status(struct net_device *netdev,
	struct ks8842_adapter *adapter)
{
	/* check the status of the link */
	if (ks8842_read16(adapter, 45, REG_P1MBSR) & 0x4) {
		netif_carrier_on(netdev);
		netif_wake_queue(netdev);
	} else {
		netif_stop_queue(netdev);
		netif_carrier_off(netdev);
	}
}

static void ks8842_enable_tx(struct ks8842_adapter *adapter)
{
	ks8842_enable_bits(adapter, 16, 0x01, REG_TXCR);
}

static void ks8842_disable_tx(struct ks8842_adapter *adapter)
{
	ks8842_clear_bits(adapter, 16, 0x01, REG_TXCR);
}

static void ks8842_enable_rx(struct ks8842_adapter *adapter)
{
	ks8842_enable_bits(adapter, 16, 0x01, REG_RXCR);
}

static void ks8842_disable_rx(struct ks8842_adapter *adapter)
{
	ks8842_clear_bits(adapter, 16, 0x01, REG_RXCR);
}

static void ks8842_reset_hw(struct ks8842_adapter *adapter)
{
	/* reset the HW */
	ks8842_reset(adapter);

	/* Enable QMU Transmit flow control / transmit padding / Transmit CRC */
	ks8842_write16(adapter, 16, 0x000E, REG_TXCR);

	/* enable the receiver, uni + multi + broadcast + flow ctrl
		+ crc strip */
	ks8842_write16(adapter, 16, 0x8 | 0x20 | 0x40 | 0x80 | 0x400,
		REG_RXCR);

	/* TX frame pointer autoincrement */
	ks8842_write16(adapter, 17, 0x4000, REG_TXFDPR);

	/* RX frame pointer autoincrement */
	ks8842_write16(adapter, 17, 0x4000, REG_RXFDPR);

	/* RX 2 kb high watermark */
	ks8842_write16(adapter, 0, 0x1000, REG_QRFCR);

	/* aggresive back off in half duplex */
	ks8842_enable_bits(adapter, 32, 1 << 8, REG_SGCR1);

	/* enable no excessive collison drop */
	ks8842_enable_bits(adapter, 32, 1 << 3, REG_SGCR2);

	/* Enable port 1 force flow control / back pressure / transmit / recv */
	ks8842_write16(adapter, 48, 0x1E07, REG_P1CR2);

	/* restart port auto-negotiation */
	ks8842_enable_bits(adapter, 49, 1 << 13, REG_P1CR4);
	/* only advertise 10Mbps */
	ks8842_clear_bits(adapter, 49, 3 << 2, REG_P1CR4);

	/* Enable the transmitter */
	ks8842_enable_tx(adapter);

	/* Enable the receiver */
	ks8842_enable_rx(adapter);

	/* clear all interrupts */
	ks8842_write16(adapter, 18, 0xffff, REG_ISR);

	/* enable interrupts */
	ks8842_write16(adapter, 18, ENABLED_IRQS, REG_IER);

	/* enable the switch */
	ks8842_write16(adapter, 32, 0x1, REG_SW_ID_AND_ENABLE);
}

static void ks8842_read_mac_addr(struct ks8842_adapter *adapter, u8 *dest)
{
	int i;
	u16 mac;

	for (i = 0; i < ETH_ALEN; i++)
		dest[ETH_ALEN - i - 1] = ks8842_read8(adapter, 2, REG_MARL + i);

	/* make sure the switch port uses the same MAC as the QMU */
	mac = ks8842_read16(adapter, 2, REG_MARL);
	ks8842_write16(adapter, 39, mac, REG_MACAR1);
	mac = ks8842_read16(adapter, 2, REG_MARM);
	ks8842_write16(adapter, 39, mac, REG_MACAR2);
	mac = ks8842_read16(adapter, 2, REG_MARH);
	ks8842_write16(adapter, 39, mac, REG_MACAR3);
}

static inline u16 ks8842_tx_fifo_space(struct ks8842_adapter *adapter)
{
	return ks8842_read16(adapter, 16, REG_TXMIR) & 0x1fff;
}

static int ks8842_tx_frame(struct sk_buff *skb, struct net_device *netdev)
{
	struct ks8842_adapter *adapter = netdev_priv(netdev);
	int len = skb->len;
	u32 *ptr = (u32 *)skb->data;
	u32 ctrl;

	dev_dbg(&adapter->pdev->dev,
		"%s: len %u head %p data %p tail %p end %p\n",
		__func__, skb->len, skb->head, skb->data,
		skb_tail_pointer(skb), skb_end_pointer(skb));

	/* check FIFO buffer space, we need space for CRC and command bits */
	if (ks8842_tx_fifo_space(adapter) < len + 8)
		return NETDEV_TX_BUSY;

	/* the control word, enable IRQ, port 1 and the length */
	ctrl = 0x8000 | 0x100 | (len << 16);
	ks8842_write32(adapter, 17, ctrl, REG_QMU_DATA_LO);

	netdev->stats.tx_bytes += len;

	/* copy buffer */
	while (len > 0) {
		iowrite32(*ptr, adapter->hw_addr + REG_QMU_DATA_LO);
		len -= sizeof(u32);
		ptr++;
	}

	/* enqueue packet */
	ks8842_write16(adapter, 17, 1, REG_TXQCR);

	dev_kfree_skb(skb);

	return NETDEV_TX_OK;
}

static void ks8842_rx_frame(struct net_device *netdev,
	struct ks8842_adapter *adapter)
{
	u32 status = ks8842_read32(adapter, 17, REG_QMU_DATA_LO);
	int len = (status >> 16) & 0x7ff;

	status &= 0xffff;

	dev_dbg(&adapter->pdev->dev, "%s - rx_data: status: %x\n",
		__func__, status);

	/* check the status */
	if ((status & RXSR_VALID) && !(status & RXSR_ERROR)) {
		struct sk_buff *skb = netdev_alloc_skb_ip_align(netdev, len);

		dev_dbg(&adapter->pdev->dev, "%s, got package, len: %d\n",
			__func__, len);
		if (skb) {
			u32 *data;

			netdev->stats.rx_packets++;
			netdev->stats.rx_bytes += len;
			if (status & RXSR_MULTICAST)
				netdev->stats.multicast++;

			data = (u32 *)skb_put(skb, len);

			ks8842_select_bank(adapter, 17);
			while (len > 0) {
				*data++ = ioread32(adapter->hw_addr +
					REG_QMU_DATA_LO);
				len -= sizeof(u32);
			}

			skb->protocol = eth_type_trans(skb, netdev);
			netif_rx(skb);
		} else
			netdev->stats.rx_dropped++;
	} else {
		dev_dbg(&adapter->pdev->dev, "RX error, status: %x\n", status);
		netdev->stats.rx_errors++;
		if (status & RXSR_TOO_LONG)
			netdev->stats.rx_length_errors++;
		if (status & RXSR_CRC_ERROR)
			netdev->stats.rx_crc_errors++;
		if (status & RXSR_RUNT)
			netdev->stats.rx_frame_errors++;
	}

	/* set high watermark to 3K */
	ks8842_clear_bits(adapter, 0, 1 << 12, REG_QRFCR);

	/* release the frame */
	ks8842_write16(adapter, 17, 0x01, REG_RXQCR);

	/* set high watermark to 2K */
	ks8842_enable_bits(adapter, 0, 1 << 12, REG_QRFCR);
}

void ks8842_handle_rx(struct net_device *netdev, struct ks8842_adapter *adapter)
{
	u16 rx_data = ks8842_read16(adapter, 16, REG_RXMIR) & 0x1fff;
	dev_dbg(&adapter->pdev->dev, "%s Entry - rx_data: %d\n",
		__func__, rx_data);
	while (rx_data) {
		ks8842_rx_frame(netdev, adapter);
		rx_data = ks8842_read16(adapter, 16, REG_RXMIR) & 0x1fff;
	}
}

void ks8842_handle_tx(struct net_device *netdev, struct ks8842_adapter *adapter)
{
	u16 sr = ks8842_read16(adapter, 16, REG_TXSR);
	dev_dbg(&adapter->pdev->dev, "%s - entry, sr: %x\n", __func__, sr);
	netdev->stats.tx_packets++;
	if (netif_queue_stopped(netdev))
		netif_wake_queue(netdev);
}

void ks8842_handle_rx_overrun(struct net_device *netdev,
	struct ks8842_adapter *adapter)
{
	dev_dbg(&adapter->pdev->dev, "%s: entry\n", __func__);
	netdev->stats.rx_errors++;
	netdev->stats.rx_fifo_errors++;
}

void ks8842_tasklet(unsigned long arg)
{
	struct net_device *netdev = (struct net_device *)arg;
	struct ks8842_adapter *adapter = netdev_priv(netdev);
	u16 isr;
	unsigned long flags;
	u16 entry_bank;

	/* read current bank to be able to set it back */
	spin_lock_irqsave(&adapter->lock, flags);
	entry_bank = ioread16(adapter->hw_addr + REG_SELECT_BANK);
	spin_unlock_irqrestore(&adapter->lock, flags);

	isr = ks8842_read16(adapter, 18, REG_ISR);
	dev_dbg(&adapter->pdev->dev, "%s - ISR: 0x%x\n", __func__, isr);

	/* Ack */
	ks8842_write16(adapter, 18, isr, REG_ISR);

	if (!netif_running(netdev))
		return;

	if (isr & IRQ_LINK_CHANGE)
		ks8842_update_link_status(netdev, adapter);

	if (isr & (IRQ_RX | IRQ_RX_ERROR))
		ks8842_handle_rx(netdev, adapter);

	if (isr & IRQ_TX)
		ks8842_handle_tx(netdev, adapter);

	if (isr & IRQ_RX_OVERRUN)
		ks8842_handle_rx_overrun(netdev, adapter);

	if (isr & IRQ_TX_STOPPED) {
		ks8842_disable_tx(adapter);
		ks8842_enable_tx(adapter);
	}

	if (isr & IRQ_RX_STOPPED) {
		ks8842_disable_rx(adapter);
		ks8842_enable_rx(adapter);
	}

	/* re-enable interrupts, put back the bank selection register */
	spin_lock_irqsave(&adapter->lock, flags);
	ks8842_write16(adapter, 18, ENABLED_IRQS, REG_IER);
	iowrite16(entry_bank, adapter->hw_addr + REG_SELECT_BANK);
	spin_unlock_irqrestore(&adapter->lock, flags);
}

static irqreturn_t ks8842_irq(int irq, void *devid)
{
	struct ks8842_adapter *adapter = devid;
	u16 isr;
	u16 entry_bank = ioread16(adapter->hw_addr + REG_SELECT_BANK);
	irqreturn_t ret = IRQ_NONE;

	isr = ks8842_read16(adapter, 18, REG_ISR);
	dev_dbg(&adapter->pdev->dev, "%s - ISR: 0x%x\n", __func__, isr);

	if (isr) {
		/* disable IRQ */
		ks8842_write16(adapter, 18, 0x00, REG_IER);

		/* schedule tasklet */
		tasklet_schedule(&adapter->tasklet);

		ret = IRQ_HANDLED;
	}

	iowrite16(entry_bank, adapter->hw_addr + REG_SELECT_BANK);

	return ret;
}


/* Netdevice operations */

static int ks8842_open(struct net_device *netdev)
{
	struct ks8842_adapter *adapter = netdev_priv(netdev);
	int err;

	dev_dbg(&adapter->pdev->dev, "%s - entry\n", __func__);

	/* reset the HW */
	ks8842_reset_hw(adapter);

	ks8842_update_link_status(netdev, adapter);

	err = request_irq(adapter->irq, ks8842_irq, IRQF_SHARED, DRV_NAME,
		adapter);
	if (err) {
		pr_err("Failed to request IRQ: %d: %d\n", adapter->irq, err);
		return err;
	}

	return 0;
}

static int ks8842_close(struct net_device *netdev)
{
	struct ks8842_adapter *adapter = netdev_priv(netdev);

	dev_dbg(&adapter->pdev->dev, "%s - entry\n", __func__);

	/* free the irq */
	free_irq(adapter->irq, adapter);

	/* disable the switch */
	ks8842_write16(adapter, 32, 0x0, REG_SW_ID_AND_ENABLE);

	return 0;
}

static netdev_tx_t ks8842_xmit_frame(struct sk_buff *skb,
				     struct net_device *netdev)
{
	int ret;
	struct ks8842_adapter *adapter = netdev_priv(netdev);

	dev_dbg(&adapter->pdev->dev, "%s: entry\n", __func__);

	ret = ks8842_tx_frame(skb, netdev);

	if (ks8842_tx_fifo_space(adapter) <  netdev->mtu + 8)
		netif_stop_queue(netdev);

	return ret;
}

static int ks8842_set_mac(struct net_device *netdev, void *p)
{
	struct ks8842_adapter *adapter = netdev_priv(netdev);
	unsigned long flags;
	struct sockaddr *addr = p;
	char *mac = (u8 *)addr->sa_data;
	int i;

	dev_dbg(&adapter->pdev->dev, "%s: entry\n", __func__);

	if (!is_valid_ether_addr(addr->sa_data))
		return -EADDRNOTAVAIL;

	memcpy(netdev->dev_addr, mac, netdev->addr_len);

	spin_lock_irqsave(&adapter->lock, flags);
	for (i = 0; i < ETH_ALEN; i++) {
		ks8842_write8(adapter, 2, mac[ETH_ALEN - i - 1], REG_MARL + i);
		ks8842_write8(adapter, 39, mac[ETH_ALEN - i - 1],
			REG_MACAR1 + i);
	}
	spin_unlock_irqrestore(&adapter->lock, flags);
	return 0;
}

static void ks8842_tx_timeout(struct net_device *netdev)
{
	struct ks8842_adapter *adapter = netdev_priv(netdev);
	unsigned long flags;

	dev_dbg(&adapter->pdev->dev, "%s: entry\n", __func__);

	spin_lock_irqsave(&adapter->lock, flags);
	/* disable interrupts */
	ks8842_write16(adapter, 18, 0, REG_IER);
	ks8842_write16(adapter, 18, 0xFFFF, REG_ISR);
	spin_unlock_irqrestore(&adapter->lock, flags);

	ks8842_reset_hw(adapter);

	ks8842_update_link_status(netdev, adapter);
}

static const struct net_device_ops ks8842_netdev_ops = {
	.ndo_open		= ks8842_open,
	.ndo_stop		= ks8842_close,
	.ndo_start_xmit		= ks8842_xmit_frame,
	.ndo_set_mac_address	= ks8842_set_mac,
	.ndo_tx_timeout 	= ks8842_tx_timeout,
	.ndo_validate_addr	= eth_validate_addr
};

static const struct ethtool_ops ks8842_ethtool_ops = {
	.get_link		= ethtool_op_get_link,
};

static int __devinit ks8842_probe(struct platform_device *pdev)
{
	int err = -ENOMEM;
	struct resource *iomem;
	struct net_device *netdev;
	struct ks8842_adapter *adapter;
	u16 id;

	iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!request_mem_region(iomem->start, resource_size(iomem), DRV_NAME))
		goto err_mem_region;

	netdev = alloc_etherdev(sizeof(struct ks8842_adapter));
	if (!netdev)
		goto err_alloc_etherdev;

	SET_NETDEV_DEV(netdev, &pdev->dev);

	adapter = netdev_priv(netdev);
	adapter->hw_addr = ioremap(iomem->start, resource_size(iomem));
	if (!adapter->hw_addr)
		goto err_ioremap;

	adapter->irq = platform_get_irq(pdev, 0);
	if (adapter->irq < 0) {
		err = adapter->irq;
		goto err_get_irq;
	}

	adapter->pdev = pdev;

	tasklet_init(&adapter->tasklet, ks8842_tasklet, (unsigned long)netdev);
	spin_lock_init(&adapter->lock);

	netdev->netdev_ops = &ks8842_netdev_ops;
	netdev->ethtool_ops = &ks8842_ethtool_ops;

	ks8842_read_mac_addr(adapter, netdev->dev_addr);

	id = ks8842_read16(adapter, 32, REG_SW_ID_AND_ENABLE);

	strcpy(netdev->name, "eth%d");
	err = register_netdev(netdev);
	if (err)
		goto err_register;

	platform_set_drvdata(pdev, netdev);

	pr_info("Found chip, family: 0x%x, id: 0x%x, rev: 0x%x\n",
		(id >> 8) & 0xff, (id >> 4) & 0xf, (id >> 1) & 0x7);

	return 0;

err_register:
err_get_irq:
	iounmap(adapter->hw_addr);
err_ioremap:
	free_netdev(netdev);
err_alloc_etherdev:
	release_mem_region(iomem->start, resource_size(iomem));
err_mem_region:
	return err;
}

static int __devexit ks8842_remove(struct platform_device *pdev)
{
	struct net_device *netdev = platform_get_drvdata(pdev);
	struct ks8842_adapter *adapter = netdev_priv(netdev);
	struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	unregister_netdev(netdev);
	tasklet_kill(&adapter->tasklet);
	iounmap(adapter->hw_addr);
	free_netdev(netdev);
	release_mem_region(iomem->start, resource_size(iomem));
	platform_set_drvdata(pdev, NULL);
	return 0;
}


static struct platform_driver ks8842_platform_driver = {
	.driver = {
		.name	= DRV_NAME,
		.owner	= THIS_MODULE,
	},
	.probe		= ks8842_probe,
	.remove		= ks8842_remove,
};

static int __init ks8842_init(void)
{
	return platform_driver_register(&ks8842_platform_driver);
}

static void __exit ks8842_exit(void)
{
	platform_driver_unregister(&ks8842_platform_driver);
}

module_init(ks8842_init);
module_exit(ks8842_exit);

MODULE_DESCRIPTION("Timberdale KS8842 ethernet driver");
MODULE_AUTHOR("Mocean Laboratories <info@mocean-labs.com>");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:ks8842");
Commit	Line	Data
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="22">b07878e5 R	1	/*
2	* ks8842_main.c timberdale KS8842 ethernet driver
3	* Copyright (c) 2009 Intel Corporation
4	*
5	* This program is free software; you can redistribute it and/or modify
6	* it under the terms of the GNU General Public License version 2 as
7	* published by the Free Software Foundation.
8	*
9	* This program is distributed in the hope that it will be useful,
10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12	* GNU General Public License for more details.
13	*
14	* You should have received a copy of the GNU General Public License
15	* along with this program; if not, write to the Free Software
16	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
17	*/
18
19	/* Supports:
20	* The Micrel KS8842 behind the timberdale FPGA
21	*/
22
0dc7d2b3 JP	23	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
0dc7d2b3 JP	24
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="337">b07878e5 R	25	#include <linux/kernel.h>
26	#include <linux/module.h>
27	#include <linux/platform_device.h>
28	#include <linux/netdevice.h>
29	#include <linux/etherdevice.h>
30	#include <linux/ethtool.h>
31
32	#define DRV_NAME "ks8842"
33
34	/* Timberdale specific Registers */
35	#define REG_TIMB_RST 0x1c
36
37	/* KS8842 registers */
38
39	#define REG_SELECT_BANK 0x0e
40
41	/* bank 0 registers */
42	#define REG_QRFCR 0x04
43
44	/* bank 2 registers */
45	#define REG_MARL 0x00
46	#define REG_MARM 0x02
47	#define REG_MARH 0x04
48
49	/* bank 3 registers */
50	#define REG_GRR 0x06
51
52	/* bank 16 registers */
53	#define REG_TXCR 0x00
54	#define REG_TXSR 0x02
55	#define REG_RXCR 0x04
56	#define REG_TXMIR 0x08
57	#define REG_RXMIR 0x0A
58
59	/* bank 17 registers */
60	#define REG_TXQCR 0x00
61	#define REG_RXQCR 0x02
62	#define REG_TXFDPR 0x04
63	#define REG_RXFDPR 0x06
64	#define REG_QMU_DATA_LO 0x08
65	#define REG_QMU_DATA_HI 0x0A
66
67	/* bank 18 registers */
68	#define REG_IER 0x00
69	#define IRQ_LINK_CHANGE 0x8000
70	#define IRQ_TX 0x4000
71	#define IRQ_RX 0x2000
72	#define IRQ_RX_OVERRUN 0x0800
73	#define IRQ_TX_STOPPED 0x0200
74	#define IRQ_RX_STOPPED 0x0100
75	#define IRQ_RX_ERROR 0x0080
76	#define ENABLED_IRQS (IRQ_LINK_CHANGE \| IRQ_TX \| IRQ_RX \| IRQ_RX_STOPPED \| \
77	IRQ_TX_STOPPED \| IRQ_RX_OVERRUN \| IRQ_RX_ERROR)
78	#define REG_ISR 0x02
79	#define REG_RXSR 0x04
80	#define RXSR_VALID 0x8000
81	#define RXSR_BROADCAST 0x80
82	#define RXSR_MULTICAST 0x40
83	#define RXSR_UNICAST 0x20
84	#define RXSR_FRAMETYPE 0x08
85	#define RXSR_TOO_LONG 0x04
86	#define RXSR_RUNT 0x02
87	#define RXSR_CRC_ERROR 0x01
88	#define RXSR_ERROR (RXSR_TOO_LONG \| RXSR_RUNT \| RXSR_CRC_ERROR)
89
90	/* bank 32 registers */
91	#define REG_SW_ID_AND_ENABLE 0x00
92	#define REG_SGCR1 0x02
93	#define REG_SGCR2 0x04
94	#define REG_SGCR3 0x06
95
96	/* bank 39 registers */
97	#define REG_MACAR1 0x00
98	#define REG_MACAR2 0x02
99	#define REG_MACAR3 0x04
100
101	/* bank 45 registers */
102	#define REG_P1MBCR 0x00
103	#define REG_P1MBSR 0x02
104
105	/* bank 46 registers */
106	#define REG_P2MBCR 0x00
107	#define REG_P2MBSR 0x02
108
109	/* bank 48 registers */
110	#define REG_P1CR2 0x02
111
112	/* bank 49 registers */
113	#define REG_P1CR4 0x02
114	#define REG_P1SR 0x04
115
116	struct ks8842_adapter {
117	void __iomem *hw_addr;
118	int irq;
119	struct tasklet_struct tasklet;
120	spinlock_t lock; /* spinlock to be interrupt safe */
121	struct platform_device *pdev;
122	};
123
124	static inline void ks8842_select_bank(struct ks8842_adapter *adapter, u16 bank)
125	{
126	iowrite16(bank, adapter->hw_addr + REG_SELECT_BANK);
127	}
128
129	static inline void ks8842_write8(struct ks8842_adapter *adapter, u16 bank,
130	u8 value, int offset)
131	{
132	ks8842_select_bank(adapter, bank);
133	iowrite8(value, adapter->hw_addr + offset);
134	}
135
136	static inline void ks8842_write16(struct ks8842_adapter *adapter, u16 bank,
137	u16 value, int offset)
138	{
139	ks8842_select_bank(adapter, bank);
140	iowrite16(value, adapter->hw_addr + offset);
141	}
142
143	static inline void ks8842_enable_bits(struct ks8842_adapter *adapter, u16 bank,
144	u16 bits, int offset)
145	{
146	u16 reg;
147	ks8842_select_bank(adapter, bank);
148	reg = ioread16(adapter->hw_addr + offset);
149	reg \|= bits;
150	iowrite16(reg, adapter->hw_addr + offset);
151	}
152
153	static inline void ks8842_clear_bits(struct ks8842_adapter *adapter, u16 bank,
154	u16 bits, int offset)
155	{
156	u16 reg;
157	ks8842_select_bank(adapter, bank);
158	reg = ioread16(adapter->hw_addr + offset);
159	reg &= ~bits;
160	iowrite16(reg, adapter->hw_addr + offset);
161	}
162
163	static inline void ks8842_write32(struct ks8842_adapter *adapter, u16 bank,
164	u32 value, int offset)
165	{
166	ks8842_select_bank(adapter, bank);
167	iowrite32(value, adapter->hw_addr + offset);
168	}
169
170	static inline u8 ks8842_read8(struct ks8842_adapter *adapter, u16 bank,
171	int offset)
172	{
173	ks8842_select_bank(adapter, bank);
174	return ioread8(adapter->hw_addr + offset);
175	}
176
177	static inline u16 ks8842_read16(struct ks8842_adapter *adapter, u16 bank,
178	int offset)
179	{
180	ks8842_select_bank(adapter, bank);
181	return ioread16(adapter->hw_addr + offset);
182	}
183
184	static inline u32 ks8842_read32(struct ks8842_adapter *adapter, u16 bank,
185	int offset)
186	{
187	ks8842_select_bank(adapter, bank);
188	return ioread32(adapter->hw_addr + offset);
189	}
190
191	static void ks8842_reset(struct ks8842_adapter *adapter)
192	{
193	/* The KS8842 goes haywire when doing softare reset
194	* a work around in the timberdale IP is implemented to
195	* do a hardware reset instead
196	ks8842_write16(adapter, 3, 1, REG_GRR);
197	msleep(10);
198	iowrite16(0, adapter->hw_addr + REG_GRR);
199	*/
200	iowrite16(32, adapter->hw_addr + REG_SELECT_BANK);
201	iowrite32(0x1, adapter->hw_addr + REG_TIMB_RST);
202	msleep(20);
203	}
204
205	static void ks8842_update_link_status(struct net_device *netdev,
206	struct ks8842_adapter *adapter)
207	{
208	/* check the status of the link */
209	if (ks8842_read16(adapter, 45, REG_P1MBSR) & 0x4) {
210	netif_carrier_on(netdev);
211	netif_wake_queue(netdev);
212	} else {
213	netif_stop_queue(netdev);
214	netif_carrier_off(netdev);
215	}
216	}
217
218	static void ks8842_enable_tx(struct ks8842_adapter *adapter)
219	{
220	ks8842_enable_bits(adapter, 16, 0x01, REG_TXCR);
221	}
222
223	static void ks8842_disable_tx(struct ks8842_adapter *adapter)
224	{
225	ks8842_clear_bits(adapter, 16, 0x01, REG_TXCR);
226	}
227
228	static void ks8842_enable_rx(struct ks8842_adapter *adapter)
229	{
230	ks8842_enable_bits(adapter, 16, 0x01, REG_RXCR);
231	}
232
233	static void ks8842_disable_rx(struct ks8842_adapter *adapter)
234	{
235	ks8842_clear_bits(adapter, 16, 0x01, REG_RXCR);
236	}
237
238	static void ks8842_reset_hw(struct ks8842_adapter *adapter)
239	{
240	/* reset the HW */
241	ks8842_reset(adapter);
242
243	/* Enable QMU Transmit flow control / transmit padding / Transmit CRC */
244	ks8842_write16(adapter, 16, 0x000E, REG_TXCR);
245
246	/* enable the receiver, uni + multi + broadcast + flow ctrl
247	+ crc strip */
248	ks8842_write16(adapter, 16, 0x8 \| 0x20 \| 0x40 \| 0x80 \| 0x400,
249	REG_RXCR);
250
251	/* TX frame pointer autoincrement */
252	ks8842_write16(adapter, 17, 0x4000, REG_TXFDPR);
253
254	/* RX frame pointer autoincrement */
255	ks8842_write16(adapter, 17, 0x4000, REG_RXFDPR);
256
257	/* RX 2 kb high watermark */
258	ks8842_write16(adapter, 0, 0x1000, REG_QRFCR);
259
260	/* aggresive back off in half duplex */
261	ks8842_enable_bits(adapter, 32, 1 << 8, REG_SGCR1);
262
263	/* enable no excessive collison drop */
264	ks8842_enable_bits(adapter, 32, 1 << 3, REG_SGCR2);
265
266	/* Enable port 1 force flow control / back pressure / transmit / recv */
267	ks8842_write16(adapter, 48, 0x1E07, REG_P1CR2);
268
269	/* restart port auto-negotiation */
270	ks8842_enable_bits(adapter, 49, 1 << 13, REG_P1CR4);
271	/* only advertise 10Mbps */
272	ks8842_clear_bits(adapter, 49, 3 << 2, REG_P1CR4);
273
274	/* Enable the transmitter */
275	ks8842_enable_tx(adapter);
276
277	/* Enable the receiver */
278	ks8842_enable_rx(adapter);
279
280	/* clear all interrupts */
281	ks8842_write16(adapter, 18, 0xffff, REG_ISR);
282
283	/* enable interrupts */
284	ks8842_write16(adapter, 18, ENABLED_IRQS, REG_IER);
285
286	/* enable the switch */
287	ks8842_write16(adapter, 32, 0x1, REG_SW_ID_AND_ENABLE);
288	}
289
290	static void ks8842_read_mac_addr(struct ks8842_adapter adapter, u8 dest)
291	{
292	int i;
293	u16 mac;
294
295	for (i = 0; i < ETH_ALEN; i++)
296	dest[ETH_ALEN - i - 1] = ks8842_read8(adapter, 2, REG_MARL + i);
297
298	/* make sure the switch port uses the same MAC as the QMU */
299	mac = ks8842_read16(adapter, 2, REG_MARL);
300	ks8842_write16(adapter, 39, mac, REG_MACAR1);
301	mac = ks8842_read16(adapter, 2, REG_MARM);
302	ks8842_write16(adapter, 39, mac, REG_MACAR2);
303	mac = ks8842_read16(adapter, 2, REG_MARH);
304	ks8842_write16(adapter, 39, mac, REG_MACAR3);
305	}
306
307	static inline u16 ks8842_tx_fifo_space(struct ks8842_adapter *adapter)
308	{
309	return ks8842_read16(adapter, 16, REG_TXMIR) & 0x1fff;
310	}
311
312	static int ks8842_tx_frame(struct sk_buff skb, struct net_device netdev)
313	{
314	struct ks8842_adapter *adapter = netdev_priv(netdev);
315	int len = skb->len;
316	u32 ptr = (u32 )skb->data;
317	u32 ctrl;
318
319	dev_dbg(&adapter->pdev->dev,
320	"%s: len %u head %p data %p tail %p end %p\n",
321	__func__, skb->len, skb->head, skb->data,
322	skb_tail_pointer(skb), skb_end_pointer(skb));
323
324	/* check FIFO buffer space, we need space for CRC and command bits */
325	if (ks8842_tx_fifo_space(adapter) < len + 8)
326	return NETDEV_TX_BUSY;
327
328	/* the control word, enable IRQ, port 1 and the length */
329	ctrl = 0x8000 \| 0x100 \| (len << 16);
330	ks8842_write32(adapter, 17, ctrl, REG_QMU_DATA_LO);
331
332	netdev->stats.tx_bytes += len;
333
334	/* copy buffer */
335	while (len > 0) {
336	iowrite32(*ptr, adapter->hw_addr + REG_QMU_DATA_LO);
337	len -= sizeof(u32);
338	ptr++;
339	}
340
341	/* enqueue packet */
342	ks8842_write16(adapter, 17, 1, REG_TXQCR);
343
344	dev_kfree_skb(skb);
345
346	return NETDEV_TX_OK;
347	}
348
349	static void ks8842_rx_frame(struct net_device *netdev,
350	struct ks8842_adapter *adapter)
351	{
352	u32 status = ks8842_read32(adapter, 17, REG_QMU_DATA_LO);
353	int len = (status >> 16) & 0x7ff;
354
355	status &= 0xffff;
356
357	dev_dbg(&adapter->pdev->dev, "%s - rx_data: status: %x\n",
358	__func__, status);
359
360	/* check the status */
361	if ((status & RXSR_VALID) && !(status & RXSR_ERROR)) {
89d71a66	362	struct sk_buff *skb = netdev_alloc_skb_ip_align(netdev, len);
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="11">b07878e5 R	363
364	dev_dbg(&adapter->pdev->dev, "%s, got package, len: %d\n",
365	__func__, len);
366	if (skb) {
367	u32 *data;
368
369	netdev->stats.rx_packets++;
370	netdev->stats.rx_bytes += len;
371	if (status & RXSR_MULTICAST)
372	netdev->stats.multicast++;
373
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="156">b07878e5 R	374	data = (u32 *)skb_put(skb, len);
375
376	ks8842_select_bank(adapter, 17);
377	while (len > 0) {
378	*data++ = ioread32(adapter->hw_addr +
379	REG_QMU_DATA_LO);
380	len -= sizeof(u32);
381	}
382
383	skb->protocol = eth_type_trans(skb, netdev);
384	netif_rx(skb);
385	} else
386	netdev->stats.rx_dropped++;
387	} else {
388	dev_dbg(&adapter->pdev->dev, "RX error, status: %x\n", status);
389	netdev->stats.rx_errors++;
390	if (status & RXSR_TOO_LONG)
391	netdev->stats.rx_length_errors++;
392	if (status & RXSR_CRC_ERROR)
393	netdev->stats.rx_crc_errors++;
394	if (status & RXSR_RUNT)
395	netdev->stats.rx_frame_errors++;
396	}
397
398	/* set high watermark to 3K */
399	ks8842_clear_bits(adapter, 0, 1 << 12, REG_QRFCR);
400
401	/* release the frame */
402	ks8842_write16(adapter, 17, 0x01, REG_RXQCR);
403
404	/* set high watermark to 2K */
405	ks8842_enable_bits(adapter, 0, 1 << 12, REG_QRFCR);
406	}
407
408	void ks8842_handle_rx(struct net_device netdev, struct ks8842_adapter adapter)
409	{
410	u16 rx_data = ks8842_read16(adapter, 16, REG_RXMIR) & 0x1fff;
411	dev_dbg(&adapter->pdev->dev, "%s Entry - rx_data: %d\n",
412	__func__, rx_data);
413	while (rx_data) {
414	ks8842_rx_frame(netdev, adapter);
415	rx_data = ks8842_read16(adapter, 16, REG_RXMIR) & 0x1fff;
416	}
417	}
418
419	void ks8842_handle_tx(struct net_device netdev, struct ks8842_adapter adapter)
420	{
421	u16 sr = ks8842_read16(adapter, 16, REG_TXSR);
422	dev_dbg(&adapter->pdev->dev, "%s - entry, sr: %x\n", __func__, sr);
423	netdev->stats.tx_packets++;
424	if (netif_queue_stopped(netdev))
425	netif_wake_queue(netdev);
426	}
427
428	void ks8842_handle_rx_overrun(struct net_device *netdev,
429	struct ks8842_adapter *adapter)
430	{
431	dev_dbg(&adapter->pdev->dev, "%s: entry\n", __func__);
432	netdev->stats.rx_errors++;
433	netdev->stats.rx_fifo_errors++;
434	}
435
436	void ks8842_tasklet(unsigned long arg)
437	{
438	struct net_device netdev = (struct net_device )arg;
439	struct ks8842_adapter *adapter = netdev_priv(netdev);
440	u16 isr;
441	unsigned long flags;
442	u16 entry_bank;
443
444	/* read current bank to be able to set it back */
445	spin_lock_irqsave(&adapter->lock, flags);
446	entry_bank = ioread16(adapter->hw_addr + REG_SELECT_BANK);
447	spin_unlock_irqrestore(&adapter->lock, flags);
448
449	isr = ks8842_read16(adapter, 18, REG_ISR);
450	dev_dbg(&adapter->pdev->dev, "%s - ISR: 0x%x\n", __func__, isr);
451
452	/* Ack */
453	ks8842_write16(adapter, 18, isr, REG_ISR);
454
455	if (!netif_running(netdev))
456	return;
457
458	if (isr & IRQ_LINK_CHANGE)
459	ks8842_update_link_status(netdev, adapter);
460
461	if (isr & (IRQ_RX \| IRQ_RX_ERROR))
462	ks8842_handle_rx(netdev, adapter);
463
464	if (isr & IRQ_TX)
465	ks8842_handle_tx(netdev, adapter);
466
467	if (isr & IRQ_RX_OVERRUN)
468	ks8842_handle_rx_overrun(netdev, adapter);
469
470	if (isr & IRQ_TX_STOPPED) {
471	ks8842_disable_tx(adapter);
472	ks8842_enable_tx(adapter);
473	}
474
475	if (isr & IRQ_RX_STOPPED) {
476	ks8842_disable_rx(adapter);
477	ks8842_enable_rx(adapter);
478	}
479
480	/* re-enable interrupts, put back the bank selection register */
481	spin_lock_irqsave(&adapter->lock, flags);
482	ks8842_write16(adapter, 18, ENABLED_IRQS, REG_IER);
483	iowrite16(entry_bank, adapter->hw_addr + REG_SELECT_BANK);
484	spin_unlock_irqrestore(&adapter->lock, flags);
485	}
486
487	static irqreturn_t ks8842_irq(int irq, void *devid)
488	{
489	struct ks8842_adapter *adapter = devid;
490	u16 isr;
491	u16 entry_bank = ioread16(adapter->hw_addr + REG_SELECT_BANK);
492	irqreturn_t ret = IRQ_NONE;
493
494	isr = ks8842_read16(adapter, 18, REG_ISR);
495	dev_dbg(&adapter->pdev->dev, "%s - ISR: 0x%x\n", __func__, isr);
496
497	if (isr) {
498	/* disable IRQ */
499	ks8842_write16(adapter, 18, 0x00, REG_IER);
500
501	/* schedule tasklet */
502	tasklet_schedule(&adapter->tasklet);
503
504	ret = IRQ_HANDLED;
505	}
506
507	iowrite16(entry_bank, adapter->hw_addr + REG_SELECT_BANK);
508
509	return ret;
510	}
511
512
513	/* Netdevice operations */
514
515	static int ks8842_open(struct net_device *netdev)
516	{
517	struct ks8842_adapter *adapter = netdev_priv(netdev);
518	int err;
519
520	dev_dbg(&adapter->pdev->dev, "%s - entry\n", __func__);
521
522	/* reset the HW */
523	ks8842_reset_hw(adapter);
524
525	ks8842_update_link_status(netdev, adapter);
526
527	err = request_irq(adapter->irq, ks8842_irq, IRQF_SHARED, DRV_NAME,
528	adapter);
529	if (err) {
0dc7d2b3	530	pr_err("Failed to request IRQ: %d: %d\n", adapter->irq, err);
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="21">b07878e5 R	531	return err;
532	}
533
534	return 0;
535	}
536
537	static int ks8842_close(struct net_device *netdev)
538	{
539	struct ks8842_adapter *adapter = netdev_priv(netdev);
540
541	dev_dbg(&adapter->pdev->dev, "%s - entry\n", __func__);
542
543	/* free the irq */
544	free_irq(adapter->irq, adapter);
545
546	/* disable the switch */
547	ks8842_write16(adapter, 32, 0x0, REG_SW_ID_AND_ENABLE);
548
549	return 0;
550	}
551
61357325 SH	552	static netdev_tx_t ks8842_xmit_frame(struct sk_buff *skb,
61357325 SH	553	struct net_device *netdev)
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="66">b07878e5 R	554	{
555	int ret;
556	struct ks8842_adapter *adapter = netdev_priv(netdev);
557
558	dev_dbg(&adapter->pdev->dev, "%s: entry\n", __func__);
559
560	ret = ks8842_tx_frame(skb, netdev);
561
562	if (ks8842_tx_fifo_space(adapter) < netdev->mtu + 8)
563	netif_stop_queue(netdev);
564
565	return ret;
566	}
567
568	static int ks8842_set_mac(struct net_device netdev, void p)
569	{
570	struct ks8842_adapter *adapter = netdev_priv(netdev);
571	unsigned long flags;
572	struct sockaddr *addr = p;
573	char mac = (u8 )addr->sa_data;
574	int i;
575
576	dev_dbg(&adapter->pdev->dev, "%s: entry\n", __func__);
577
578	if (!is_valid_ether_addr(addr->sa_data))
579	return -EADDRNOTAVAIL;
580
581	memcpy(netdev->dev_addr, mac, netdev->addr_len);
582
583	spin_lock_irqsave(&adapter->lock, flags);
584	for (i = 0; i < ETH_ALEN; i++) {
585	ks8842_write8(adapter, 2, mac[ETH_ALEN - i - 1], REG_MARL + i);
586	ks8842_write8(adapter, 39, mac[ETH_ALEN - i - 1],
587	REG_MACAR1 + i);
588	}
589	spin_unlock_irqrestore(&adapter->lock, flags);
590	return 0;
591	}
592
593	static void ks8842_tx_timeout(struct net_device *netdev)
594	{
595	struct ks8842_adapter *adapter = netdev_priv(netdev);
596	unsigned long flags;
597
598	dev_dbg(&adapter->pdev->dev, "%s: entry\n", __func__);
599
600	spin_lock_irqsave(&adapter->lock, flags);
601	/* disable interrupts */
602	ks8842_write16(adapter, 18, 0, REG_IER);
603	ks8842_write16(adapter, 18, 0xFFFF, REG_ISR);
604	spin_unlock_irqrestore(&adapter->lock, flags);
605
606	ks8842_reset_hw(adapter);
607
608	ks8842_update_link_status(netdev, adapter);
609	}
610
611	static const struct net_device_ops ks8842_netdev_ops = {
612	.ndo_open = ks8842_open,
613	.ndo_stop = ks8842_close,
614	.ndo_start_xmit = ks8842_xmit_frame,
615	.ndo_set_mac_address = ks8842_set_mac,
616	.ndo_tx_timeout = ks8842_tx_timeout,
617	.ndo_validate_addr = eth_validate_addr
618	};
619
0fc0b732	620	static const struct ethtool_ops ks8842_ethtool_ops = {
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="51">b07878e5 R	621	.get_link = ethtool_op_get_link,
622	};
623
624	static int __devinit ks8842_probe(struct platform_device *pdev)
625	{
626	int err = -ENOMEM;
627	struct resource *iomem;
628	struct net_device *netdev;
629	struct ks8842_adapter *adapter;
630	u16 id;
631
632	iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
633	if (!request_mem_region(iomem->start, resource_size(iomem), DRV_NAME))
634	goto err_mem_region;
635
636	netdev = alloc_etherdev(sizeof(struct ks8842_adapter));
637	if (!netdev)
638	goto err_alloc_etherdev;
639
640	SET_NETDEV_DEV(netdev, &pdev->dev);
641
642	adapter = netdev_priv(netdev);
643	adapter->hw_addr = ioremap(iomem->start, resource_size(iomem));
644	if (!adapter->hw_addr)
645	goto err_ioremap;
646
647	adapter->irq = platform_get_irq(pdev, 0);
648	if (adapter->irq < 0) {
649	err = adapter->irq;
650	goto err_get_irq;
651	}
652
653	adapter->pdev = pdev;
654
655	tasklet_init(&adapter->tasklet, ks8842_tasklet, (unsigned long)netdev);
656	spin_lock_init(&adapter->lock);
657
658	netdev->netdev_ops = &ks8842_netdev_ops;
659	netdev->ethtool_ops = &ks8842_ethtool_ops;
660
661	ks8842_read_mac_addr(adapter, netdev->dev_addr);
662
663	id = ks8842_read16(adapter, 32, REG_SW_ID_AND_ENABLE);
664
665	strcpy(netdev->name, "eth%d");
666	err = register_netdev(netdev);
667	if (err)
668	goto err_register;
669
670	platform_set_drvdata(pdev, netdev);
671
0dc7d2b3	672	pr_info("Found chip, family: 0x%x, id: 0x%x, rev: 0x%x\n",
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="58">b07878e5 R	673	(id >> 8) & 0xff, (id >> 4) & 0xf, (id >> 1) & 0x7);
674
675	return 0;
676
677	err_register:
678	err_get_irq:
679	iounmap(adapter->hw_addr);
680	err_ioremap:
681	free_netdev(netdev);
682	err_alloc_etherdev:
683	release_mem_region(iomem->start, resource_size(iomem));
684	err_mem_region:
685	return err;
686	}
687
688	static int __devexit ks8842_remove(struct platform_device *pdev)
689	{
690	struct net_device *netdev = platform_get_drvdata(pdev);
691	struct ks8842_adapter *adapter = netdev_priv(netdev);
692	struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
693
694	unregister_netdev(netdev);
695	tasklet_kill(&adapter->tasklet);
696	iounmap(adapter->hw_addr);
697	free_netdev(netdev);
698	release_mem_region(iomem->start, resource_size(iomem));
699	platform_set_drvdata(pdev, NULL);
700	return 0;
701	}
702
703
704	static struct platform_driver ks8842_platform_driver = {
705	.driver = {
706	.name = DRV_NAME,
707	.owner = THIS_MODULE,
708	},
709	.probe = ks8842_probe,
710	.remove = ks8842_remove,
711	};
712
713	static int __init ks8842_init(void)
714	{
715	return platform_driver_register(&ks8842_platform_driver);
716	}
717
718	static void __exit ks8842_exit(void)
719	{
720	platform_driver_unregister(&ks8842_platform_driver);
721	}
722
723	module_init(ks8842_init);
724	module_exit(ks8842_exit);
725
726	MODULE_DESCRIPTION("Timberdale KS8842 ethernet driver");
727	MODULE_AUTHOR("Mocean Laboratories <info@mocean-labs.com>");
728	MODULE_LICENSE("GPL v2");
729	MODULE_ALIAS("platform:ks8842");
730