[deliverable/linux.git] / drivers / net / ixp2000 / ixpdev.c

/*
 * IXP2000 MSF network device driver
 * Copyright (C) 2004, 2005 Lennert Buytenhek <buytenh@wantstofly.org>
 * Dedicated to Marija Kulikova.
 *
 * 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.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/init.h>
#include <linux/moduleparam.h>
#include <asm/hardware/uengine.h>
#include <asm/io.h>
#include "ixp2400_rx.ucode"
#include "ixp2400_tx.ucode"
#include "ixpdev_priv.h"
#include "ixpdev.h"
#include "pm3386.h"

#define DRV_MODULE_VERSION	"0.2"

static int nds_count;
static struct net_device **nds;
static int nds_open;
static void (*set_port_admin_status)(int port, int up);

static struct ixpdev_rx_desc * const rx_desc =
	(struct ixpdev_rx_desc *)(IXP2000_SRAM0_VIRT_BASE + RX_BUF_DESC_BASE);
static struct ixpdev_tx_desc * const tx_desc =
	(struct ixpdev_tx_desc *)(IXP2000_SRAM0_VIRT_BASE + TX_BUF_DESC_BASE);
static int tx_pointer;


static int ixpdev_xmit(struct sk_buff *skb, struct net_device *dev)
{
	struct ixpdev_priv *ip = netdev_priv(dev);
	struct ixpdev_tx_desc *desc;
	int entry;
	unsigned long flags;

	if (unlikely(skb->len > PAGE_SIZE)) {
		/* @@@ Count drops.  */
		dev_kfree_skb(skb);
		return NETDEV_TX_OK;
	}

	entry = tx_pointer;
	tx_pointer = (tx_pointer + 1) % TX_BUF_COUNT;

	desc = tx_desc + entry;
	desc->pkt_length = skb->len;
	desc->channel = ip->channel;

	skb_copy_and_csum_dev(skb, phys_to_virt(desc->buf_addr));
	dev_kfree_skb(skb);

	ixp2000_reg_write(RING_TX_PENDING,
		TX_BUF_DESC_BASE + (entry * sizeof(struct ixpdev_tx_desc)));

	dev->trans_start = jiffies;

	local_irq_save(flags);
	ip->tx_queue_entries++;
	if (ip->tx_queue_entries == TX_BUF_COUNT_PER_CHAN)
		netif_stop_queue(dev);
	local_irq_restore(flags);

	return NETDEV_TX_OK;
}


static int ixpdev_rx(struct net_device *dev, int processed, int budget)
{
	while (processed < budget) {
		struct ixpdev_rx_desc *desc;
		struct sk_buff *skb;
		void *buf;
		u32 _desc;

		_desc = ixp2000_reg_read(RING_RX_DONE);
		if (_desc == 0)
			return 0;

		desc = rx_desc +
			((_desc - RX_BUF_DESC_BASE) / sizeof(struct ixpdev_rx_desc));
		buf = phys_to_virt(desc->buf_addr);

		if (desc->pkt_length < 4 || desc->pkt_length > PAGE_SIZE) {
			printk(KERN_ERR "ixp2000: rx err, length %d\n",
					desc->pkt_length);
			goto err;
		}

		if (desc->channel < 0 || desc->channel >= nds_count) {
			printk(KERN_ERR "ixp2000: rx err, channel %d\n",
					desc->channel);
			goto err;
		}

		/* @@@ Make FCS stripping configurable.  */
		desc->pkt_length -= 4;

		if (unlikely(!netif_running(nds[desc->channel])))
			goto err;

		skb = netdev_alloc_skb_ip_align(dev, desc->pkt_length);
		if (likely(skb != NULL)) {
			skb_copy_to_linear_data(skb, buf, desc->pkt_length);
			skb_put(skb, desc->pkt_length);
			skb->protocol = eth_type_trans(skb, nds[desc->channel]);

			netif_receive_skb(skb);
		}

err:
		ixp2000_reg_write(RING_RX_PENDING, _desc);
		processed++;
	}

	return processed;
}

/* dev always points to nds[0].  */
static int ixpdev_poll(struct napi_struct *napi, int budget)
{
	struct ixpdev_priv *ip = container_of(napi, struct ixpdev_priv, napi);
	struct net_device *dev = ip->dev;
	int rx;

	rx = 0;
	do {
		ixp2000_reg_write(IXP2000_IRQ_THD_RAW_STATUS_A_0, 0x00ff);

		rx = ixpdev_rx(dev, rx, budget);
		if (rx >= budget)
			break;
	} while (ixp2000_reg_read(IXP2000_IRQ_THD_RAW_STATUS_A_0) & 0x00ff);

	napi_complete(napi);
	ixp2000_reg_write(IXP2000_IRQ_THD_ENABLE_SET_A_0, 0x00ff);

	return rx;
}

static void ixpdev_tx_complete(void)
{
	int channel;
	u32 wake;

	wake = 0;
	while (1) {
		struct ixpdev_priv *ip;
		u32 desc;
		int entry;

		desc = ixp2000_reg_read(RING_TX_DONE);
		if (desc == 0)
			break;

		/* @@@ Check whether entries come back in order.  */
		entry = (desc - TX_BUF_DESC_BASE) / sizeof(struct ixpdev_tx_desc);
		channel = tx_desc[entry].channel;

		if (channel < 0 || channel >= nds_count) {
			printk(KERN_ERR "ixp2000: txcomp channel index "
					"out of bounds (%d, %.8i, %d)\n",
					channel, (unsigned int)desc, entry);
			continue;
		}

		ip = netdev_priv(nds[channel]);
		if (ip->tx_queue_entries == TX_BUF_COUNT_PER_CHAN)
			wake |= 1 << channel;
		ip->tx_queue_entries--;
	}

	for (channel = 0; wake != 0; channel++) {
		if (wake & (1 << channel)) {
			netif_wake_queue(nds[channel]);
			wake &= ~(1 << channel);
		}
	}
}

static irqreturn_t ixpdev_interrupt(int irq, void *dev_id)
{
	u32 status;

	status = ixp2000_reg_read(IXP2000_IRQ_THD_STATUS_A_0);
	if (status == 0)
		return IRQ_NONE;

	/*
	 * Any of the eight receive units signaled RX?
	 */
	if (status & 0x00ff) {
		struct net_device *dev = nds[0];
		struct ixpdev_priv *ip = netdev_priv(dev);

		ixp2000_reg_wrb(IXP2000_IRQ_THD_ENABLE_CLEAR_A_0, 0x00ff);
		if (likely(napi_schedule_prep(&ip->napi))) {
			__napi_schedule(&ip->napi);
		} else {
			printk(KERN_CRIT "ixp2000: irq while polling!!\n");
		}
	}

	/*
	 * Any of the eight transmit units signaled TXdone?
	 */
	if (status & 0xff00) {
		ixp2000_reg_wrb(IXP2000_IRQ_THD_RAW_STATUS_A_0, 0xff00);
		ixpdev_tx_complete();
	}

	return IRQ_HANDLED;
}

#ifdef CONFIG_NET_POLL_CONTROLLER
static void ixpdev_poll_controller(struct net_device *dev)
{
	disable_irq(IRQ_IXP2000_THDA0);
	ixpdev_interrupt(IRQ_IXP2000_THDA0, dev);
	enable_irq(IRQ_IXP2000_THDA0);
}
#endif

static int ixpdev_open(struct net_device *dev)
{
	struct ixpdev_priv *ip = netdev_priv(dev);
	int err;

	napi_enable(&ip->napi);
	if (!nds_open++) {
		err = request_irq(IRQ_IXP2000_THDA0, ixpdev_interrupt,
					IRQF_SHARED, "ixp2000_eth", nds);
		if (err) {
			nds_open--;
			napi_disable(&ip->napi);
			return err;
		}

		ixp2000_reg_write(IXP2000_IRQ_THD_ENABLE_SET_A_0, 0xffff);
	}

	set_port_admin_status(ip->channel, 1);
	netif_start_queue(dev);

	return 0;
}

static int ixpdev_close(struct net_device *dev)
{
	struct ixpdev_priv *ip = netdev_priv(dev);

	netif_stop_queue(dev);
	napi_disable(&ip->napi);
	set_port_admin_status(ip->channel, 0);

	if (!--nds_open) {
		ixp2000_reg_write(IXP2000_IRQ_THD_ENABLE_CLEAR_A_0, 0xffff);
		free_irq(IRQ_IXP2000_THDA0, nds);
	}

	return 0;
}

static struct net_device_stats *ixpdev_get_stats(struct net_device *dev)
{
	struct ixpdev_priv *ip = netdev_priv(dev);

	pm3386_get_stats(ip->channel, &(dev->stats));

	return &(dev->stats);
}

static const struct net_device_ops ixpdev_netdev_ops = {
	.ndo_open		= ixpdev_open,
	.ndo_stop		= ixpdev_close,
	.ndo_start_xmit		= ixpdev_xmit,
	.ndo_change_mtu		= eth_change_mtu,
	.ndo_validate_addr	= eth_validate_addr,
	.ndo_set_mac_address	= eth_mac_addr,
	.ndo_get_stats		= ixpdev_get_stats,
#ifdef CONFIG_NET_POLL_CONTROLLER
	.ndo_poll_controller	= ixpdev_poll_controller,
#endif
};

struct net_device *ixpdev_alloc(int channel, int sizeof_priv)
{
	struct net_device *dev;
	struct ixpdev_priv *ip;

	dev = alloc_etherdev(sizeof_priv);
	if (dev == NULL)
		return NULL;

	dev->netdev_ops = &ixpdev_netdev_ops;

	dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;

	ip = netdev_priv(dev);
	ip->dev = dev;
	netif_napi_add(dev, &ip->napi, ixpdev_poll, 64);
	ip->channel = channel;
	ip->tx_queue_entries = 0;

	return dev;
}

int ixpdev_init(int __nds_count, struct net_device **__nds,
		void (*__set_port_admin_status)(int port, int up))
{
	int i;
	int err;

	BUILD_BUG_ON(RX_BUF_COUNT > 192 || TX_BUF_COUNT > 192);

	printk(KERN_INFO "IXP2000 MSF ethernet driver %s\n", DRV_MODULE_VERSION);

	nds_count = __nds_count;
	nds = __nds;
	set_port_admin_status = __set_port_admin_status;

	for (i = 0; i < RX_BUF_COUNT; i++) {
		void *buf;

		buf = (void *)get_zeroed_page(GFP_KERNEL);
		if (buf == NULL) {
			err = -ENOMEM;
			while (--i >= 0)
				free_page((unsigned long)phys_to_virt(rx_desc[i].buf_addr));
			goto err_out;
		}
		rx_desc[i].buf_addr = virt_to_phys(buf);
		rx_desc[i].buf_length = PAGE_SIZE;
	}

	/* @@@ Maybe we shouldn't be preallocating TX buffers.  */
	for (i = 0; i < TX_BUF_COUNT; i++) {
		void *buf;

		buf = (void *)get_zeroed_page(GFP_KERNEL);
		if (buf == NULL) {
			err = -ENOMEM;
			while (--i >= 0)
				free_page((unsigned long)phys_to_virt(tx_desc[i].buf_addr));
			goto err_free_rx;
		}
		tx_desc[i].buf_addr = virt_to_phys(buf);
	}

	/* 256 entries, ring status set means 'empty', base address 0x0000.  */
	ixp2000_reg_write(RING_RX_PENDING_BASE, 0x44000000);
	ixp2000_reg_write(RING_RX_PENDING_HEAD, 0x00000000);
	ixp2000_reg_write(RING_RX_PENDING_TAIL, 0x00000000);

	/* 256 entries, ring status set means 'full', base address 0x0400.  */
	ixp2000_reg_write(RING_RX_DONE_BASE, 0x40000400);
	ixp2000_reg_write(RING_RX_DONE_HEAD, 0x00000000);
	ixp2000_reg_write(RING_RX_DONE_TAIL, 0x00000000);

	for (i = 0; i < RX_BUF_COUNT; i++) {
		ixp2000_reg_write(RING_RX_PENDING,
			RX_BUF_DESC_BASE + (i * sizeof(struct ixpdev_rx_desc)));
	}

	ixp2000_uengine_load(0, &ixp2400_rx);
	ixp2000_uengine_start_contexts(0, 0xff);

	/* 256 entries, ring status set means 'empty', base address 0x0800.  */
	ixp2000_reg_write(RING_TX_PENDING_BASE, 0x44000800);
	ixp2000_reg_write(RING_TX_PENDING_HEAD, 0x00000000);
	ixp2000_reg_write(RING_TX_PENDING_TAIL, 0x00000000);

	/* 256 entries, ring status set means 'full', base address 0x0c00.  */
	ixp2000_reg_write(RING_TX_DONE_BASE, 0x40000c00);
	ixp2000_reg_write(RING_TX_DONE_HEAD, 0x00000000);
	ixp2000_reg_write(RING_TX_DONE_TAIL, 0x00000000);

	ixp2000_uengine_load(1, &ixp2400_tx);
	ixp2000_uengine_start_contexts(1, 0xff);

	for (i = 0; i < nds_count; i++) {
		err = register_netdev(nds[i]);
		if (err) {
			while (--i >= 0)
				unregister_netdev(nds[i]);
			goto err_free_tx;
		}
	}

	for (i = 0; i < nds_count; i++) {
		printk(KERN_INFO "%s: IXP2000 MSF ethernet (port %d), "
			"%.2x:%.2x:%.2x:%.2x:%.2x:%.2x.\n", nds[i]->name, i,
			nds[i]->dev_addr[0], nds[i]->dev_addr[1],
			nds[i]->dev_addr[2], nds[i]->dev_addr[3],
			nds[i]->dev_addr[4], nds[i]->dev_addr[5]);
	}

	return 0;

err_free_tx:
	for (i = 0; i < TX_BUF_COUNT; i++)
		free_page((unsigned long)phys_to_virt(tx_desc[i].buf_addr));

err_free_rx:
	for (i = 0; i < RX_BUF_COUNT; i++)
		free_page((unsigned long)phys_to_virt(rx_desc[i].buf_addr));

err_out:
	return err;
} 

void ixpdev_deinit(void)
{
	int i;

	/* @@@ Flush out pending packets.  */

	for (i = 0; i < nds_count; i++)
		unregister_netdev(nds[i]);

	ixp2000_uengine_stop_contexts(1, 0xff);
	ixp2000_uengine_stop_contexts(0, 0xff);
	ixp2000_uengine_reset(0x3);

	for (i = 0; i < TX_BUF_COUNT; i++)
		free_page((unsigned long)phys_to_virt(tx_desc[i].buf_addr));

	for (i = 0; i < RX_BUF_COUNT; i++)
		free_page((unsigned long)phys_to_virt(rx_desc[i].buf_addr));
}
Commit	Line	Data
15d014d1 LB	1	/*
	2	* IXP2000 MSF network device driver
	3	* Copyright (C) 2004, 2005 Lennert Buytenhek <buytenh@wantstofly.org>
	4	* Dedicated to Marija Kulikova.
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*/
	11
15d014d1 LB	12	#include <linux/module.h>
	13	#include <linux/kernel.h>
	14	#include <linux/netdevice.h>
	15	#include <linux/etherdevice.h>
	16	#include <linux/init.h>
	17	#include <linux/moduleparam.h>
18ec5c73	18	#include <asm/hardware/uengine.h>
15d014d1 LB	19	#include <asm/io.h>
	20	#include "ixp2400_rx.ucode"
	21	#include "ixp2400_tx.ucode"
	22	#include "ixpdev_priv.h"
	23	#include "ixpdev.h"
b9696ea3	24	#include "pm3386.h"
15d014d1	25
12747784 LB	26	#define DRV_MODULE_VERSION "0.2"
12747784 LB	27
15d014d1 LB	28	static int nds_count;
	29	static struct net_device **nds;
	30	static int nds_open;
	31	static void (*set_port_admin_status)(int port, int up);
	32
	33	static struct ixpdev_rx_desc * const rx_desc =
	34	(struct ixpdev_rx_desc *)(IXP2000_SRAM0_VIRT_BASE + RX_BUF_DESC_BASE);
	35	static struct ixpdev_tx_desc * const tx_desc =
	36	(struct ixpdev_tx_desc *)(IXP2000_SRAM0_VIRT_BASE + TX_BUF_DESC_BASE);
	37	static int tx_pointer;
	38
	39
	40	static int ixpdev_xmit(struct sk_buff skb, struct net_device dev)
	41	{
	42	struct ixpdev_priv *ip = netdev_priv(dev);
	43	struct ixpdev_tx_desc *desc;
	44	int entry;
4871953c	45	unsigned long flags;
15d014d1 LB	46
	47	if (unlikely(skb->len > PAGE_SIZE)) {
	48	/* @@@ Count drops. */
	49	dev_kfree_skb(skb);
6ed10654	50	return NETDEV_TX_OK;
15d014d1 LB	51	}
	52
	53	entry = tx_pointer;
	54	tx_pointer = (tx_pointer + 1) % TX_BUF_COUNT;
	55
	56	desc = tx_desc + entry;
	57	desc->pkt_length = skb->len;
	58	desc->channel = ip->channel;
	59
	60	skb_copy_and_csum_dev(skb, phys_to_virt(desc->buf_addr));
	61	dev_kfree_skb(skb);
	62
	63	ixp2000_reg_write(RING_TX_PENDING,
	64	TX_BUF_DESC_BASE + (entry * sizeof(struct ixpdev_tx_desc)));
	65
	66	dev->trans_start = jiffies;
	67
4871953c	68	local_irq_save(flags);
15d014d1 LB	69	ip->tx_queue_entries++;
	70	if (ip->tx_queue_entries == TX_BUF_COUNT_PER_CHAN)
	71	netif_stop_queue(dev);
4871953c	72	local_irq_restore(flags);
15d014d1	73
6ed10654	74	return NETDEV_TX_OK;
15d014d1 LB	75	}
	76
	77
bea3348e	78	static int ixpdev_rx(struct net_device *dev, int processed, int budget)
15d014d1	79	{
bea3348e	80	while (processed < budget) {
15d014d1 LB	81	struct ixpdev_rx_desc *desc;
	82	struct sk_buff *skb;
	83	void *buf;
	84	u32 _desc;
	85
	86	_desc = ixp2000_reg_read(RING_RX_DONE);
	87	if (_desc == 0)
	88	return 0;
	89
	90	desc = rx_desc +
	91	((_desc - RX_BUF_DESC_BASE) / sizeof(struct ixpdev_rx_desc));
	92	buf = phys_to_virt(desc->buf_addr);
	93
	94	if (desc->pkt_length < 4 \|\| desc->pkt_length > PAGE_SIZE) {
	95	printk(KERN_ERR "ixp2000: rx err, length %d\n",
	96	desc->pkt_length);
	97	goto err;
	98	}
	99
	100	if (desc->channel < 0 \|\| desc->channel >= nds_count) {
	101	printk(KERN_ERR "ixp2000: rx err, channel %d\n",
	102	desc->channel);
	103	goto err;
	104	}
	105
	106	/* @@@ Make FCS stripping configurable. */
	107	desc->pkt_length -= 4;
	108
	109	if (unlikely(!netif_running(nds[desc->channel])))
	110	goto err;
	111
89d71a66	112	skb = netdev_alloc_skb_ip_align(dev, desc->pkt_length);
15d014d1	113	if (likely(skb != NULL)) {
8c7b7faa	114	skb_copy_to_linear_data(skb, buf, desc->pkt_length);
15d014d1	115	skb_put(skb, desc->pkt_length);
4c13eb66	116	skb->protocol = eth_type_trans(skb, nds[desc->channel]);
15d014d1	117
15d014d1 LB	118	netif_receive_skb(skb);
	119	}
	120
	121	err:
	122	ixp2000_reg_write(RING_RX_PENDING, _desc);
bea3348e	123	processed++;
15d014d1 LB	124	}
15d014d1 LB	125
bea3348e	126	return processed;
15d014d1 LB	127	}
	128
	129	/* dev always points to nds[0]. */
bea3348e	130	static int ixpdev_poll(struct napi_struct *napi, int budget)
15d014d1	131	{
bea3348e SH	132	struct ixpdev_priv *ip = container_of(napi, struct ixpdev_priv, napi);
	133	struct net_device *dev = ip->dev;
	134	int rx;
	135
bea3348e	136	rx = 0;
15d014d1 LB	137	do {
	138	ixp2000_reg_write(IXP2000_IRQ_THD_RAW_STATUS_A_0, 0x00ff);
	139
bea3348e SH	140	rx = ixpdev_rx(dev, rx, budget);
	141	if (rx >= budget)
	142	break;
15d014d1 LB	143	} while (ixp2000_reg_read(IXP2000_IRQ_THD_RAW_STATUS_A_0) & 0x00ff);
15d014d1 LB	144
288379f0	145	napi_complete(napi);
15d014d1 LB	146	ixp2000_reg_write(IXP2000_IRQ_THD_ENABLE_SET_A_0, 0x00ff);
15d014d1 LB	147
bea3348e	148	return rx;
15d014d1 LB	149	}
15d014d1 LB	150
15d014d1 LB	151	static void ixpdev_tx_complete(void)
	152	{
	153	int channel;
	154	u32 wake;
	155
	156	wake = 0;
	157	while (1) {
	158	struct ixpdev_priv *ip;
	159	u32 desc;
	160	int entry;
	161
	162	desc = ixp2000_reg_read(RING_TX_DONE);
	163	if (desc == 0)
	164	break;
	165
	166	/* @@@ Check whether entries come back in order. */
	167	entry = (desc - TX_BUF_DESC_BASE) / sizeof(struct ixpdev_tx_desc);
	168	channel = tx_desc[entry].channel;
	169
	170	if (channel < 0 \|\| channel >= nds_count) {
	171	printk(KERN_ERR "ixp2000: txcomp channel index "
	172	"out of bounds (%d, %.8i, %d)\n",
	173	channel, (unsigned int)desc, entry);
	174	continue;
	175	}
	176
	177	ip = netdev_priv(nds[channel]);
	178	if (ip->tx_queue_entries == TX_BUF_COUNT_PER_CHAN)
	179	wake \|= 1 << channel;
	180	ip->tx_queue_entries--;
	181	}
	182
	183	for (channel = 0; wake != 0; channel++) {
	184	if (wake & (1 << channel)) {
	185	netif_wake_queue(nds[channel]);
	186	wake &= ~(1 << channel);
	187	}
	188	}
	189	}
	190
7d12e780	191	static irqreturn_t ixpdev_interrupt(int irq, void *dev_id)
15d014d1 LB	192	{
	193	u32 status;
	194
	195	status = ixp2000_reg_read(IXP2000_IRQ_THD_STATUS_A_0);
	196	if (status == 0)
	197	return IRQ_NONE;
	198
	199	/*
	200	* Any of the eight receive units signaled RX?
	201	*/
	202	if (status & 0x00ff) {
bea3348e SH	203	struct net_device *dev = nds[0];
	204	struct ixpdev_priv *ip = netdev_priv(dev);
	205
15d014d1	206	ixp2000_reg_wrb(IXP2000_IRQ_THD_ENABLE_CLEAR_A_0, 0x00ff);
bea3348e	207	if (likely(napi_schedule_prep(&ip->napi))) {
288379f0	208	__napi_schedule(&ip->napi);
15d014d1 LB	209	} else {
	210	printk(KERN_CRIT "ixp2000: irq while polling!!\n");
	211	}
	212	}
	213
	214	/*
	215	* Any of the eight transmit units signaled TXdone?
	216	*/
	217	if (status & 0xff00) {
	218	ixp2000_reg_wrb(IXP2000_IRQ_THD_RAW_STATUS_A_0, 0xff00);
	219	ixpdev_tx_complete();
	220	}
	221
	222	return IRQ_HANDLED;
	223	}
	224
8ce51d69 LB	225	#ifdef CONFIG_NET_POLL_CONTROLLER
	226	static void ixpdev_poll_controller(struct net_device *dev)
	227	{
	228	disable_irq(IRQ_IXP2000_THDA0);
0da2f0f1	229	ixpdev_interrupt(IRQ_IXP2000_THDA0, dev);
8ce51d69 LB	230	enable_irq(IRQ_IXP2000_THDA0);
	231	}
	232	#endif
	233
15d014d1 LB	234	static int ixpdev_open(struct net_device *dev)
	235	{
	236	struct ixpdev_priv *ip = netdev_priv(dev);
	237	int err;
	238
bea3348e	239	napi_enable(&ip->napi);
15d014d1 LB	240	if (!nds_open++) {
15d014d1 LB	241	err = request_irq(IRQ_IXP2000_THDA0, ixpdev_interrupt,
1fb9df5d	242	IRQF_SHARED, "ixp2000_eth", nds);
15d014d1 LB	243	if (err) {
15d014d1 LB	244	nds_open--;
bea3348e	245	napi_disable(&ip->napi);
15d014d1 LB	246	return err;
	247	}
	248
	249	ixp2000_reg_write(IXP2000_IRQ_THD_ENABLE_SET_A_0, 0xffff);
	250	}
	251
	252	set_port_admin_status(ip->channel, 1);
	253	netif_start_queue(dev);
	254
	255	return 0;
	256	}
	257
	258	static int ixpdev_close(struct net_device *dev)
	259	{
	260	struct ixpdev_priv *ip = netdev_priv(dev);
	261
	262	netif_stop_queue(dev);
bea3348e	263	napi_disable(&ip->napi);
15d014d1 LB	264	set_port_admin_status(ip->channel, 0);
	265
	266	if (!--nds_open) {
	267	ixp2000_reg_write(IXP2000_IRQ_THD_ENABLE_CLEAR_A_0, 0xffff);
	268	free_irq(IRQ_IXP2000_THDA0, nds);
	269	}
	270
	271	return 0;
	272	}
	273
b9696ea3 VS	274	static struct net_device_stats ixpdev_get_stats(struct net_device dev)
	275	{
	276	struct ixpdev_priv *ip = netdev_priv(dev);
	277
	278	pm3386_get_stats(ip->channel, &(dev->stats));
	279
	280	return &(dev->stats);
	281	}
	282
e7090e34 AB	283	static const struct net_device_ops ixpdev_netdev_ops = {
	284	.ndo_open = ixpdev_open,
	285	.ndo_stop = ixpdev_close,
	286	.ndo_start_xmit = ixpdev_xmit,
	287	.ndo_change_mtu = eth_change_mtu,
	288	.ndo_validate_addr = eth_validate_addr,
	289	.ndo_set_mac_address = eth_mac_addr,
b9696ea3	290	.ndo_get_stats = ixpdev_get_stats,
e7090e34 AB	291	#ifdef CONFIG_NET_POLL_CONTROLLER
	292	.ndo_poll_controller = ixpdev_poll_controller,
	293	#endif
	294	};
	295
15d014d1 LB	296	struct net_device *ixpdev_alloc(int channel, int sizeof_priv)
	297	{
	298	struct net_device *dev;
	299	struct ixpdev_priv *ip;
	300
	301	dev = alloc_etherdev(sizeof_priv);
	302	if (dev == NULL)
	303	return NULL;
	304
e7090e34	305	dev->netdev_ops = &ixpdev_netdev_ops;
15d014d1 LB	306
15d014d1 LB	307	dev->features \|= NETIF_F_SG \| NETIF_F_HW_CSUM;
15d014d1 LB	308
15d014d1 LB	309	ip = netdev_priv(dev);
bea3348e SH	310	ip->dev = dev;
bea3348e SH	311	netif_napi_add(dev, &ip->napi, ixpdev_poll, 64);
15d014d1 LB	312	ip->channel = channel;
	313	ip->tx_queue_entries = 0;
	314
	315	return dev;
	316	}
	317
	318	int ixpdev_init(int __nds_count, struct net_device **__nds,
	319	void (*__set_port_admin_status)(int port, int up))
	320	{
	321	int i;
	322	int err;
	323
5d4fe2c1	324	BUILD_BUG_ON(RX_BUF_COUNT > 192 \|\| TX_BUF_COUNT > 192);
15d014d1	325
12747784 LB	326	printk(KERN_INFO "IXP2000 MSF ethernet driver %s\n", DRV_MODULE_VERSION);
12747784 LB	327
15d014d1 LB	328	nds_count = __nds_count;
	329	nds = __nds;
	330	set_port_admin_status = __set_port_admin_status;
	331
15d014d1 LB	332	for (i = 0; i < RX_BUF_COUNT; i++) {
	333	void *buf;
	334
	335	buf = (void *)get_zeroed_page(GFP_KERNEL);
	336	if (buf == NULL) {
	337	err = -ENOMEM;
	338	while (--i >= 0)
	339	free_page((unsigned long)phys_to_virt(rx_desc[i].buf_addr));
0c49919a	340	goto err_out;
15d014d1 LB	341	}
	342	rx_desc[i].buf_addr = virt_to_phys(buf);
	343	rx_desc[i].buf_length = PAGE_SIZE;
	344	}
	345
	346	/* @@@ Maybe we shouldn't be preallocating TX buffers. */
	347	for (i = 0; i < TX_BUF_COUNT; i++) {
	348	void *buf;
	349
	350	buf = (void *)get_zeroed_page(GFP_KERNEL);
	351	if (buf == NULL) {
	352	err = -ENOMEM;
	353	while (--i >= 0)
	354	free_page((unsigned long)phys_to_virt(tx_desc[i].buf_addr));
	355	goto err_free_rx;
	356	}
	357	tx_desc[i].buf_addr = virt_to_phys(buf);
	358	}
	359
	360	/* 256 entries, ring status set means 'empty', base address 0x0000. */
	361	ixp2000_reg_write(RING_RX_PENDING_BASE, 0x44000000);
	362	ixp2000_reg_write(RING_RX_PENDING_HEAD, 0x00000000);
	363	ixp2000_reg_write(RING_RX_PENDING_TAIL, 0x00000000);
	364
	365	/* 256 entries, ring status set means 'full', base address 0x0400. */
	366	ixp2000_reg_write(RING_RX_DONE_BASE, 0x40000400);
	367	ixp2000_reg_write(RING_RX_DONE_HEAD, 0x00000000);
	368	ixp2000_reg_write(RING_RX_DONE_TAIL, 0x00000000);
	369
	370	for (i = 0; i < RX_BUF_COUNT; i++) {
	371	ixp2000_reg_write(RING_RX_PENDING,
	372	RX_BUF_DESC_BASE + (i * sizeof(struct ixpdev_rx_desc)));
	373	}
	374
	375	ixp2000_uengine_load(0, &ixp2400_rx);
	376	ixp2000_uengine_start_contexts(0, 0xff);
	377
15d014d1 LB	378	/* 256 entries, ring status set means 'empty', base address 0x0800. */
	379	ixp2000_reg_write(RING_TX_PENDING_BASE, 0x44000800);
	380	ixp2000_reg_write(RING_TX_PENDING_HEAD, 0x00000000);
	381	ixp2000_reg_write(RING_TX_PENDING_TAIL, 0x00000000);
	382
	383	/* 256 entries, ring status set means 'full', base address 0x0c00. */
	384	ixp2000_reg_write(RING_TX_DONE_BASE, 0x40000c00);
	385	ixp2000_reg_write(RING_TX_DONE_HEAD, 0x00000000);
	386	ixp2000_reg_write(RING_TX_DONE_TAIL, 0x00000000);
	387
	388	ixp2000_uengine_load(1, &ixp2400_tx);
	389	ixp2000_uengine_start_contexts(1, 0xff);
	390
0c49919a LB	391	for (i = 0; i < nds_count; i++) {
	392	err = register_netdev(nds[i]);
	393	if (err) {
	394	while (--i >= 0)
	395	unregister_netdev(nds[i]);
	396	goto err_free_tx;
	397	}
	398	}
	399
7ed98bfd LB	400	for (i = 0; i < nds_count; i++) {
	401	printk(KERN_INFO "%s: IXP2000 MSF ethernet (port %d), "
	402	"%.2x:%.2x:%.2x:%.2x:%.2x:%.2x.\n", nds[i]->name, i,
	403	nds[i]->dev_addr[0], nds[i]->dev_addr[1],
	404	nds[i]->dev_addr[2], nds[i]->dev_addr[3],
	405	nds[i]->dev_addr[4], nds[i]->dev_addr[5]);
	406	}
	407
15d014d1 LB	408	return 0;
15d014d1 LB	409
0c49919a LB	410	err_free_tx:
	411	for (i = 0; i < TX_BUF_COUNT; i++)
	412	free_page((unsigned long)phys_to_virt(tx_desc[i].buf_addr));
	413
15d014d1 LB	414	err_free_rx:
	415	for (i = 0; i < RX_BUF_COUNT; i++)
	416	free_page((unsigned long)phys_to_virt(rx_desc[i].buf_addr));
	417
15d014d1 LB	418	err_out:
	419	return err;
	420	}
	421
	422	void ixpdev_deinit(void)
	423	{
	424	int i;
	425
	426	/* @@@ Flush out pending packets. */
	427
0c49919a LB	428	for (i = 0; i < nds_count; i++)
	429	unregister_netdev(nds[i]);
	430
15d014d1 LB	431	ixp2000_uengine_stop_contexts(1, 0xff);
	432	ixp2000_uengine_stop_contexts(0, 0xff);
	433	ixp2000_uengine_reset(0x3);
	434
	435	for (i = 0; i < TX_BUF_COUNT; i++)
	436	free_page((unsigned long)phys_to_virt(tx_desc[i].buf_addr));
	437
	438	for (i = 0; i < RX_BUF_COUNT; i++)
	439	free_page((unsigned long)phys_to_virt(rx_desc[i].buf_addr));
15d014d1	440	}