[net-next-2.6.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"

#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;

	if (unlikely(skb->len > PAGE_SIZE)) {
		/* @@@ Count drops.  */
		dev_kfree_skb(skb);
		return 0;
	}

	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_disable();
	ip->tx_queue_entries++;
	if (ip->tx_queue_entries == TX_BUF_COUNT_PER_CHAN)
		netif_stop_queue(dev);
	local_irq_enable();

	return 0;
}


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(dev, desc->pkt_length + 2);
		if (likely(skb != NULL)) {
			skb_reserve(skb, 2);
			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);

	netif_rx_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))) {
			__netif_rx_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;
}

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->hard_start_xmit = ixpdev_xmit;
	dev->open = ixpdev_open;
	dev->stop = ixpdev_close;
#ifdef CONFIG_NET_POLL_CONTROLLER
	dev->poll_controller = ixpdev_poll_controller;
#endif

	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"
	24
12747784 LB	25	#define DRV_MODULE_VERSION "0.2"
12747784 LB	26
15d014d1 LB	27	static int nds_count;
	28	static struct net_device **nds;
	29	static int nds_open;
	30	static void (*set_port_admin_status)(int port, int up);
	31
	32	static struct ixpdev_rx_desc * const rx_desc =
	33	(struct ixpdev_rx_desc *)(IXP2000_SRAM0_VIRT_BASE + RX_BUF_DESC_BASE);
	34	static struct ixpdev_tx_desc * const tx_desc =
	35	(struct ixpdev_tx_desc *)(IXP2000_SRAM0_VIRT_BASE + TX_BUF_DESC_BASE);
	36	static int tx_pointer;
	37
	38
	39	static int ixpdev_xmit(struct sk_buff skb, struct net_device dev)
	40	{
	41	struct ixpdev_priv *ip = netdev_priv(dev);
	42	struct ixpdev_tx_desc *desc;
	43	int entry;
	44
	45	if (unlikely(skb->len > PAGE_SIZE)) {
	46	/* @@@ Count drops. */
	47	dev_kfree_skb(skb);
	48	return 0;
	49	}
	50
	51	entry = tx_pointer;
	52	tx_pointer = (tx_pointer + 1) % TX_BUF_COUNT;
	53
	54	desc = tx_desc + entry;
	55	desc->pkt_length = skb->len;
	56	desc->channel = ip->channel;
	57
	58	skb_copy_and_csum_dev(skb, phys_to_virt(desc->buf_addr));
	59	dev_kfree_skb(skb);
	60
	61	ixp2000_reg_write(RING_TX_PENDING,
	62	TX_BUF_DESC_BASE + (entry * sizeof(struct ixpdev_tx_desc)));
	63
	64	dev->trans_start = jiffies;
	65
	66	local_irq_disable();
	67	ip->tx_queue_entries++;
	68	if (ip->tx_queue_entries == TX_BUF_COUNT_PER_CHAN)
	69	netif_stop_queue(dev);
	70	local_irq_enable();
	71
	72	return 0;
	73	}
	74
	75
bea3348e	76	static int ixpdev_rx(struct net_device *dev, int processed, int budget)
15d014d1	77	{
bea3348e	78	while (processed < budget) {
15d014d1 LB	79	struct ixpdev_rx_desc *desc;
	80	struct sk_buff *skb;
	81	void *buf;
	82	u32 _desc;
	83
	84	_desc = ixp2000_reg_read(RING_RX_DONE);
	85	if (_desc == 0)
	86	return 0;
	87
	88	desc = rx_desc +
	89	((_desc - RX_BUF_DESC_BASE) / sizeof(struct ixpdev_rx_desc));
	90	buf = phys_to_virt(desc->buf_addr);
	91
	92	if (desc->pkt_length < 4 \|\| desc->pkt_length > PAGE_SIZE) {
	93	printk(KERN_ERR "ixp2000: rx err, length %d\n",
	94	desc->pkt_length);
	95	goto err;
	96	}
	97
	98	if (desc->channel < 0 \|\| desc->channel >= nds_count) {
	99	printk(KERN_ERR "ixp2000: rx err, channel %d\n",
	100	desc->channel);
	101	goto err;
	102	}
	103
	104	/* @@@ Make FCS stripping configurable. */
	105	desc->pkt_length -= 4;
	106
	107	if (unlikely(!netif_running(nds[desc->channel])))
	108	goto err;
	109
d27e7c3f	110	skb = netdev_alloc_skb(dev, desc->pkt_length + 2);
15d014d1	111	if (likely(skb != NULL)) {
15d014d1	112	skb_reserve(skb, 2);
8c7b7faa	113	skb_copy_to_linear_data(skb, buf, desc->pkt_length);
15d014d1	114	skb_put(skb, desc->pkt_length);
4c13eb66	115	skb->protocol = eth_type_trans(skb, nds[desc->channel]);
15d014d1	116
15d014d1 LB	117	netif_receive_skb(skb);
	118	}
	119
	120	err:
	121	ixp2000_reg_write(RING_RX_PENDING, _desc);
bea3348e	122	processed++;
15d014d1 LB	123	}
15d014d1 LB	124
bea3348e	125	return processed;
15d014d1 LB	126	}
	127
	128	/* dev always points to nds[0]. */
bea3348e	129	static int ixpdev_poll(struct napi_struct *napi, int budget)
15d014d1	130	{
bea3348e SH	131	struct ixpdev_priv *ip = container_of(napi, struct ixpdev_priv, napi);
	132	struct net_device *dev = ip->dev;
	133	int rx;
	134
bea3348e	135	rx = 0;
15d014d1 LB	136	do {
	137	ixp2000_reg_write(IXP2000_IRQ_THD_RAW_STATUS_A_0, 0x00ff);
	138
bea3348e SH	139	rx = ixpdev_rx(dev, rx, budget);
	140	if (rx >= budget)
	141	break;
15d014d1 LB	142	} while (ixp2000_reg_read(IXP2000_IRQ_THD_RAW_STATUS_A_0) & 0x00ff);
15d014d1 LB	143
908a7a16	144	netif_rx_complete(napi);
15d014d1 LB	145	ixp2000_reg_write(IXP2000_IRQ_THD_ENABLE_SET_A_0, 0x00ff);
15d014d1 LB	146
bea3348e	147	return rx;
15d014d1 LB	148	}
15d014d1 LB	149
15d014d1 LB	150	static void ixpdev_tx_complete(void)
	151	{
	152	int channel;
	153	u32 wake;
	154
	155	wake = 0;
	156	while (1) {
	157	struct ixpdev_priv *ip;
	158	u32 desc;
	159	int entry;
	160
	161	desc = ixp2000_reg_read(RING_TX_DONE);
	162	if (desc == 0)
	163	break;
	164
	165	/* @@@ Check whether entries come back in order. */
	166	entry = (desc - TX_BUF_DESC_BASE) / sizeof(struct ixpdev_tx_desc);
	167	channel = tx_desc[entry].channel;
	168
	169	if (channel < 0 \|\| channel >= nds_count) {
	170	printk(KERN_ERR "ixp2000: txcomp channel index "
	171	"out of bounds (%d, %.8i, %d)\n",
	172	channel, (unsigned int)desc, entry);
	173	continue;
	174	}
	175
	176	ip = netdev_priv(nds[channel]);
	177	if (ip->tx_queue_entries == TX_BUF_COUNT_PER_CHAN)
	178	wake \|= 1 << channel;
	179	ip->tx_queue_entries--;
	180	}
	181
	182	for (channel = 0; wake != 0; channel++) {
	183	if (wake & (1 << channel)) {
	184	netif_wake_queue(nds[channel]);
	185	wake &= ~(1 << channel);
	186	}
	187	}
	188	}
	189
7d12e780	190	static irqreturn_t ixpdev_interrupt(int irq, void *dev_id)
15d014d1 LB	191	{
	192	u32 status;
	193
	194	status = ixp2000_reg_read(IXP2000_IRQ_THD_STATUS_A_0);
	195	if (status == 0)
	196	return IRQ_NONE;
	197
	198	/*
	199	* Any of the eight receive units signaled RX?
	200	*/
	201	if (status & 0x00ff) {
bea3348e SH	202	struct net_device *dev = nds[0];
	203	struct ixpdev_priv *ip = netdev_priv(dev);
	204
15d014d1	205	ixp2000_reg_wrb(IXP2000_IRQ_THD_ENABLE_CLEAR_A_0, 0x00ff);
bea3348e	206	if (likely(napi_schedule_prep(&ip->napi))) {
908a7a16	207	__netif_rx_schedule(&ip->napi);
15d014d1 LB	208	} else {
	209	printk(KERN_CRIT "ixp2000: irq while polling!!\n");
	210	}
	211	}
	212
	213	/*
	214	* Any of the eight transmit units signaled TXdone?
	215	*/
	216	if (status & 0xff00) {
	217	ixp2000_reg_wrb(IXP2000_IRQ_THD_RAW_STATUS_A_0, 0xff00);
	218	ixpdev_tx_complete();
	219	}
	220
	221	return IRQ_HANDLED;
	222	}
	223
8ce51d69 LB	224	#ifdef CONFIG_NET_POLL_CONTROLLER
	225	static void ixpdev_poll_controller(struct net_device *dev)
	226	{
	227	disable_irq(IRQ_IXP2000_THDA0);
0da2f0f1	228	ixpdev_interrupt(IRQ_IXP2000_THDA0, dev);
8ce51d69 LB	229	enable_irq(IRQ_IXP2000_THDA0);
	230	}
	231	#endif
	232
15d014d1 LB	233	static int ixpdev_open(struct net_device *dev)
	234	{
	235	struct ixpdev_priv *ip = netdev_priv(dev);
	236	int err;
	237
bea3348e	238	napi_enable(&ip->napi);
15d014d1 LB	239	if (!nds_open++) {
15d014d1 LB	240	err = request_irq(IRQ_IXP2000_THDA0, ixpdev_interrupt,
1fb9df5d	241	IRQF_SHARED, "ixp2000_eth", nds);
15d014d1 LB	242	if (err) {
15d014d1 LB	243	nds_open--;
bea3348e	244	napi_disable(&ip->napi);
15d014d1 LB	245	return err;
	246	}
	247
	248	ixp2000_reg_write(IXP2000_IRQ_THD_ENABLE_SET_A_0, 0xffff);
	249	}
	250
	251	set_port_admin_status(ip->channel, 1);
	252	netif_start_queue(dev);
	253
	254	return 0;
	255	}
	256
	257	static int ixpdev_close(struct net_device *dev)
	258	{
	259	struct ixpdev_priv *ip = netdev_priv(dev);
	260
	261	netif_stop_queue(dev);
bea3348e	262	napi_disable(&ip->napi);
15d014d1 LB	263	set_port_admin_status(ip->channel, 0);
	264
	265	if (!--nds_open) {
	266	ixp2000_reg_write(IXP2000_IRQ_THD_ENABLE_CLEAR_A_0, 0xffff);
	267	free_irq(IRQ_IXP2000_THDA0, nds);
	268	}
	269
	270	return 0;
	271	}
	272
	273	struct net_device *ixpdev_alloc(int channel, int sizeof_priv)
	274	{
	275	struct net_device *dev;
	276	struct ixpdev_priv *ip;
	277
	278	dev = alloc_etherdev(sizeof_priv);
	279	if (dev == NULL)
	280	return NULL;
	281
	282	dev->hard_start_xmit = ixpdev_xmit;
15d014d1 LB	283	dev->open = ixpdev_open;
15d014d1 LB	284	dev->stop = ixpdev_close;
8ce51d69 LB	285	#ifdef CONFIG_NET_POLL_CONTROLLER
	286	dev->poll_controller = ixpdev_poll_controller;
	287	#endif
15d014d1 LB	288
15d014d1 LB	289	dev->features \|= NETIF_F_SG \| NETIF_F_HW_CSUM;
15d014d1 LB	290
15d014d1 LB	291	ip = netdev_priv(dev);
bea3348e SH	292	ip->dev = dev;
bea3348e SH	293	netif_napi_add(dev, &ip->napi, ixpdev_poll, 64);
15d014d1 LB	294	ip->channel = channel;
	295	ip->tx_queue_entries = 0;
	296
	297	return dev;
	298	}
	299
	300	int ixpdev_init(int __nds_count, struct net_device **__nds,
	301	void (*__set_port_admin_status)(int port, int up))
	302	{
	303	int i;
	304	int err;
	305
5d4fe2c1	306	BUILD_BUG_ON(RX_BUF_COUNT > 192 \|\| TX_BUF_COUNT > 192);
15d014d1	307
12747784 LB	308	printk(KERN_INFO "IXP2000 MSF ethernet driver %s\n", DRV_MODULE_VERSION);
12747784 LB	309
15d014d1 LB	310	nds_count = __nds_count;
	311	nds = __nds;
	312	set_port_admin_status = __set_port_admin_status;
	313
15d014d1 LB	314	for (i = 0; i < RX_BUF_COUNT; i++) {
	315	void *buf;
	316
	317	buf = (void *)get_zeroed_page(GFP_KERNEL);
	318	if (buf == NULL) {
	319	err = -ENOMEM;
	320	while (--i >= 0)
	321	free_page((unsigned long)phys_to_virt(rx_desc[i].buf_addr));
0c49919a	322	goto err_out;
15d014d1 LB	323	}
	324	rx_desc[i].buf_addr = virt_to_phys(buf);
	325	rx_desc[i].buf_length = PAGE_SIZE;
	326	}
	327
	328	/* @@@ Maybe we shouldn't be preallocating TX buffers. */
	329	for (i = 0; i < TX_BUF_COUNT; i++) {
	330	void *buf;
	331
	332	buf = (void *)get_zeroed_page(GFP_KERNEL);
	333	if (buf == NULL) {
	334	err = -ENOMEM;
	335	while (--i >= 0)
	336	free_page((unsigned long)phys_to_virt(tx_desc[i].buf_addr));
	337	goto err_free_rx;
	338	}
	339	tx_desc[i].buf_addr = virt_to_phys(buf);
	340	}
	341
	342	/* 256 entries, ring status set means 'empty', base address 0x0000. */
	343	ixp2000_reg_write(RING_RX_PENDING_BASE, 0x44000000);
	344	ixp2000_reg_write(RING_RX_PENDING_HEAD, 0x00000000);
	345	ixp2000_reg_write(RING_RX_PENDING_TAIL, 0x00000000);
	346
	347	/* 256 entries, ring status set means 'full', base address 0x0400. */
	348	ixp2000_reg_write(RING_RX_DONE_BASE, 0x40000400);
	349	ixp2000_reg_write(RING_RX_DONE_HEAD, 0x00000000);
	350	ixp2000_reg_write(RING_RX_DONE_TAIL, 0x00000000);
	351
	352	for (i = 0; i < RX_BUF_COUNT; i++) {
	353	ixp2000_reg_write(RING_RX_PENDING,
	354	RX_BUF_DESC_BASE + (i * sizeof(struct ixpdev_rx_desc)));
	355	}
	356
	357	ixp2000_uengine_load(0, &ixp2400_rx);
	358	ixp2000_uengine_start_contexts(0, 0xff);
	359
15d014d1 LB	360	/* 256 entries, ring status set means 'empty', base address 0x0800. */
	361	ixp2000_reg_write(RING_TX_PENDING_BASE, 0x44000800);
	362	ixp2000_reg_write(RING_TX_PENDING_HEAD, 0x00000000);
	363	ixp2000_reg_write(RING_TX_PENDING_TAIL, 0x00000000);
	364
	365	/* 256 entries, ring status set means 'full', base address 0x0c00. */
	366	ixp2000_reg_write(RING_TX_DONE_BASE, 0x40000c00);
	367	ixp2000_reg_write(RING_TX_DONE_HEAD, 0x00000000);
	368	ixp2000_reg_write(RING_TX_DONE_TAIL, 0x00000000);
	369
	370	ixp2000_uengine_load(1, &ixp2400_tx);
	371	ixp2000_uengine_start_contexts(1, 0xff);
	372
0c49919a LB	373	for (i = 0; i < nds_count; i++) {
	374	err = register_netdev(nds[i]);
	375	if (err) {
	376	while (--i >= 0)
	377	unregister_netdev(nds[i]);
	378	goto err_free_tx;
	379	}
	380	}
	381
7ed98bfd LB	382	for (i = 0; i < nds_count; i++) {
	383	printk(KERN_INFO "%s: IXP2000 MSF ethernet (port %d), "
	384	"%.2x:%.2x:%.2x:%.2x:%.2x:%.2x.\n", nds[i]->name, i,
	385	nds[i]->dev_addr[0], nds[i]->dev_addr[1],
	386	nds[i]->dev_addr[2], nds[i]->dev_addr[3],
	387	nds[i]->dev_addr[4], nds[i]->dev_addr[5]);
	388	}
	389
15d014d1 LB	390	return 0;
15d014d1 LB	391
0c49919a LB	392	err_free_tx:
	393	for (i = 0; i < TX_BUF_COUNT; i++)
	394	free_page((unsigned long)phys_to_virt(tx_desc[i].buf_addr));
	395
15d014d1 LB	396	err_free_rx:
	397	for (i = 0; i < RX_BUF_COUNT; i++)
	398	free_page((unsigned long)phys_to_virt(rx_desc[i].buf_addr));
	399
15d014d1 LB	400	err_out:
	401	return err;
	402	}
	403
	404	void ixpdev_deinit(void)
	405	{
	406	int i;
	407
	408	/* @@@ Flush out pending packets. */
	409
0c49919a LB	410	for (i = 0; i < nds_count; i++)
	411	unregister_netdev(nds[i]);
	412
15d014d1 LB	413	ixp2000_uengine_stop_contexts(1, 0xff);
	414	ixp2000_uengine_stop_contexts(0, 0xff);
	415	ixp2000_uengine_reset(0x3);
	416
	417	for (i = 0; i < TX_BUF_COUNT; i++)
	418	free_page((unsigned long)phys_to_virt(tx_desc[i].buf_addr));
	419
	420	for (i = 0; i < RX_BUF_COUNT; i++)
	421	free_page((unsigned long)phys_to_virt(rx_desc[i].buf_addr));
15d014d1	422	}