[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/config.h>
#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/arch/uengine.h>
#include <asm/mach-types.h>
#include <asm/io.h>
#include "ixp2400_rx.ucode"
#include "ixp2400_tx.ucode"
#include "ixpdev_priv.h"
#include "ixpdev.h"

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 *budget)
{
	while (*budget > 0) {
		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 = dev_alloc_skb(desc->pkt_length + 2);
		if (likely(skb != NULL)) {
			skb->dev = nds[desc->channel];
			skb_reserve(skb, 2);
			eth_copy_and_sum(skb, buf, desc->pkt_length, 0);
			skb_put(skb, desc->pkt_length);
			skb->protocol = eth_type_trans(skb, skb->dev);

			skb->dev->last_rx = jiffies;

			netif_receive_skb(skb);
		}

err:
		ixp2000_reg_write(RING_RX_PENDING, _desc);
		dev->quota--;
		(*budget)--;
	}

	return 1;
}

/* dev always points to nds[0].  */
static int ixpdev_poll(struct net_device *dev, int *budget)
{
	/* @@@ Have to stop polling when nds[0] is administratively
	 * downed while we are polling.  */
	do {
		ixp2000_reg_write(IXP2000_IRQ_THD_RAW_STATUS_A_0, 0x00ff);

		if (ixpdev_rx(dev, budget))
			return 1;
	} while (ixp2000_reg_read(IXP2000_IRQ_THD_RAW_STATUS_A_0) & 0x00ff);

	netif_rx_complete(dev);
	ixp2000_reg_write(IXP2000_IRQ_THD_ENABLE_SET_A_0, 0x00ff);

	return 0;
}

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, struct pt_regs *regs)
{
	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) {
		ixp2000_reg_wrb(IXP2000_IRQ_THD_ENABLE_CLEAR_A_0, 0x00ff);
		if (likely(netif_rx_schedule_test(nds[0]))) {
			__netif_rx_schedule(nds[0]);
		} 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;
}

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

	if (!nds_open++) {
		err = request_irq(IRQ_IXP2000_THDA0, ixpdev_interrupt,
					SA_SHIRQ, "ixp2000_eth", nds);
		if (err) {
			nds_open--;
			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);
	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->poll = ixpdev_poll;
	dev->open = ixpdev_open;
	dev->stop = ixpdev_close;

	dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
	dev->weight = 64;

	ip = netdev_priv(dev);
	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;

	if (RX_BUF_COUNT > 192 || TX_BUF_COUNT > 192) {
		static void __too_many_rx_or_tx_buffers(void);
		__too_many_rx_or_tx_buffers();
	}

	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;
		}
	}

	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
	12	#include <linux/config.h>
	13	#include <linux/module.h>
	14	#include <linux/kernel.h>
	15	#include <linux/netdevice.h>
	16	#include <linux/etherdevice.h>
	17	#include <linux/init.h>
	18	#include <linux/moduleparam.h>
	19	#include <asm/arch/uengine.h>
	20	#include <asm/mach-types.h>
	21	#include <asm/io.h>
	22	#include "ixp2400_rx.ucode"
	23	#include "ixp2400_tx.ucode"
	24	#include "ixpdev_priv.h"
	25	#include "ixpdev.h"
	26
	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
76	static int ixpdev_rx(struct net_device dev, int budget)
77	{
78	while (*budget > 0) {
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
110	skb = dev_alloc_skb(desc->pkt_length + 2);
111	if (likely(skb != NULL)) {
112	skb->dev = nds[desc->channel];
113	skb_reserve(skb, 2);
114	eth_copy_and_sum(skb, buf, desc->pkt_length, 0);
115	skb_put(skb, desc->pkt_length);
116	skb->protocol = eth_type_trans(skb, skb->dev);
117
118	skb->dev->last_rx = jiffies;
119
120	netif_receive_skb(skb);
121	}
122
123	err:
124	ixp2000_reg_write(RING_RX_PENDING, _desc);
125	dev->quota--;
126	(*budget)--;
127	}
128
129	return 1;
130	}
131
132	/* dev always points to nds[0]. */
133	static int ixpdev_poll(struct net_device dev, int budget)
134	{
135	/* @@@ Have to stop polling when nds[0] is administratively
136	* downed while we are polling. */
137	do {
138	ixp2000_reg_write(IXP2000_IRQ_THD_RAW_STATUS_A_0, 0x00ff);
139
140	if (ixpdev_rx(dev, budget))
141	return 1;
142	} while (ixp2000_reg_read(IXP2000_IRQ_THD_RAW_STATUS_A_0) & 0x00ff);
143
144	netif_rx_complete(dev);
145	ixp2000_reg_write(IXP2000_IRQ_THD_ENABLE_SET_A_0, 0x00ff);
146
147	return 0;
148	}
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
	190	static irqreturn_t ixpdev_interrupt(int irq, void dev_id, struct pt_regs regs)
	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) {
	202	ixp2000_reg_wrb(IXP2000_IRQ_THD_ENABLE_CLEAR_A_0, 0x00ff);
ee612494	203	if (likely(netif_rx_schedule_test(nds[0]))) {
15d014d1 LB	204	__netif_rx_schedule(nds[0]);
	205	} else {
	206	printk(KERN_CRIT "ixp2000: irq while polling!!\n");
	207	}
	208	}
	209
	210	/*
	211	* Any of the eight transmit units signaled TXdone?
	212	*/
	213	if (status & 0xff00) {
	214	ixp2000_reg_wrb(IXP2000_IRQ_THD_RAW_STATUS_A_0, 0xff00);
	215	ixpdev_tx_complete();
	216	}
	217
	218	return IRQ_HANDLED;
	219	}
	220
	221	static int ixpdev_open(struct net_device *dev)
	222	{
	223	struct ixpdev_priv *ip = netdev_priv(dev);
	224	int err;
	225
	226	if (!nds_open++) {
	227	err = request_irq(IRQ_IXP2000_THDA0, ixpdev_interrupt,
	228	SA_SHIRQ, "ixp2000_eth", nds);
	229	if (err) {
	230	nds_open--;
	231	return err;
	232	}
	233
	234	ixp2000_reg_write(IXP2000_IRQ_THD_ENABLE_SET_A_0, 0xffff);
	235	}
	236
	237	set_port_admin_status(ip->channel, 1);
	238	netif_start_queue(dev);
	239
	240	return 0;
	241	}
	242
	243	static int ixpdev_close(struct net_device *dev)
	244	{
	245	struct ixpdev_priv *ip = netdev_priv(dev);
	246
	247	netif_stop_queue(dev);
	248	set_port_admin_status(ip->channel, 0);
	249
	250	if (!--nds_open) {
	251	ixp2000_reg_write(IXP2000_IRQ_THD_ENABLE_CLEAR_A_0, 0xffff);
	252	free_irq(IRQ_IXP2000_THDA0, nds);
	253	}
	254
	255	return 0;
	256	}
	257
	258	struct net_device *ixpdev_alloc(int channel, int sizeof_priv)
	259	{
	260	struct net_device *dev;
	261	struct ixpdev_priv *ip;
	262
	263	dev = alloc_etherdev(sizeof_priv);
	264	if (dev == NULL)
	265	return NULL;
	266
	267	dev->hard_start_xmit = ixpdev_xmit;
268	dev->poll = ixpdev_poll;
269	dev->open = ixpdev_open;
270	dev->stop = ixpdev_close;
271
272	dev->features \|= NETIF_F_SG \| NETIF_F_HW_CSUM;
273	dev->weight = 64;
274
275	ip = netdev_priv(dev);
276	ip->channel = channel;
277	ip->tx_queue_entries = 0;
278
279	return dev;
280	}
281
282	int ixpdev_init(int __nds_count, struct net_device **__nds,
283	void (*__set_port_admin_status)(int port, int up))
284	{
285	int i;
286	int err;
287
288	if (RX_BUF_COUNT > 192 \|\| TX_BUF_COUNT > 192) {
289	static void __too_many_rx_or_tx_buffers(void);
290	__too_many_rx_or_tx_buffers();
291	}
292
293	nds_count = __nds_count;
294	nds = __nds;
295	set_port_admin_status = __set_port_admin_status;
296
15d014d1 LB	297	for (i = 0; i < RX_BUF_COUNT; i++) {
	298	void *buf;
	299
	300	buf = (void *)get_zeroed_page(GFP_KERNEL);
	301	if (buf == NULL) {
	302	err = -ENOMEM;
	303	while (--i >= 0)
	304	free_page((unsigned long)phys_to_virt(rx_desc[i].buf_addr));
0c49919a	305	goto err_out;
15d014d1 LB	306	}
	307	rx_desc[i].buf_addr = virt_to_phys(buf);
	308	rx_desc[i].buf_length = PAGE_SIZE;
	309	}
	310
	311	/* @@@ Maybe we shouldn't be preallocating TX buffers. */
	312	for (i = 0; i < TX_BUF_COUNT; i++) {
	313	void *buf;
	314
	315	buf = (void *)get_zeroed_page(GFP_KERNEL);
	316	if (buf == NULL) {
	317	err = -ENOMEM;
	318	while (--i >= 0)
	319	free_page((unsigned long)phys_to_virt(tx_desc[i].buf_addr));
	320	goto err_free_rx;
	321	}
	322	tx_desc[i].buf_addr = virt_to_phys(buf);
	323	}
	324
	325	/* 256 entries, ring status set means 'empty', base address 0x0000. */
	326	ixp2000_reg_write(RING_RX_PENDING_BASE, 0x44000000);
	327	ixp2000_reg_write(RING_RX_PENDING_HEAD, 0x00000000);
	328	ixp2000_reg_write(RING_RX_PENDING_TAIL, 0x00000000);
	329
	330	/* 256 entries, ring status set means 'full', base address 0x0400. */
	331	ixp2000_reg_write(RING_RX_DONE_BASE, 0x40000400);
	332	ixp2000_reg_write(RING_RX_DONE_HEAD, 0x00000000);
	333	ixp2000_reg_write(RING_RX_DONE_TAIL, 0x00000000);
	334
	335	for (i = 0; i < RX_BUF_COUNT; i++) {
	336	ixp2000_reg_write(RING_RX_PENDING,
	337	RX_BUF_DESC_BASE + (i * sizeof(struct ixpdev_rx_desc)));
	338	}
	339
	340	ixp2000_uengine_load(0, &ixp2400_rx);
	341	ixp2000_uengine_start_contexts(0, 0xff);
	342
15d014d1 LB	343	/* 256 entries, ring status set means 'empty', base address 0x0800. */
	344	ixp2000_reg_write(RING_TX_PENDING_BASE, 0x44000800);
	345	ixp2000_reg_write(RING_TX_PENDING_HEAD, 0x00000000);
	346	ixp2000_reg_write(RING_TX_PENDING_TAIL, 0x00000000);
	347
	348	/* 256 entries, ring status set means 'full', base address 0x0c00. */
	349	ixp2000_reg_write(RING_TX_DONE_BASE, 0x40000c00);
	350	ixp2000_reg_write(RING_TX_DONE_HEAD, 0x00000000);
	351	ixp2000_reg_write(RING_TX_DONE_TAIL, 0x00000000);
	352
	353	ixp2000_uengine_load(1, &ixp2400_tx);
	354	ixp2000_uengine_start_contexts(1, 0xff);
	355
0c49919a LB	356	for (i = 0; i < nds_count; i++) {
	357	err = register_netdev(nds[i]);
	358	if (err) {
	359	while (--i >= 0)
	360	unregister_netdev(nds[i]);
	361	goto err_free_tx;
	362	}
	363	}
	364
15d014d1 LB	365	return 0;
15d014d1 LB	366
0c49919a LB	367	err_free_tx:
	368	for (i = 0; i < TX_BUF_COUNT; i++)
	369	free_page((unsigned long)phys_to_virt(tx_desc[i].buf_addr));
	370
15d014d1 LB	371	err_free_rx:
	372	for (i = 0; i < RX_BUF_COUNT; i++)
	373	free_page((unsigned long)phys_to_virt(rx_desc[i].buf_addr));
	374
15d014d1 LB	375	err_out:
	376	return err;
	377	}
	378
	379	void ixpdev_deinit(void)
	380	{
	381	int i;
	382
	383	/* @@@ Flush out pending packets. */
	384
0c49919a LB	385	for (i = 0; i < nds_count; i++)
	386	unregister_netdev(nds[i]);
	387
15d014d1 LB	388	ixp2000_uengine_stop_contexts(1, 0xff);
	389	ixp2000_uengine_stop_contexts(0, 0xff);
	390	ixp2000_uengine_reset(0x3);
	391
	392	for (i = 0; i < TX_BUF_COUNT; i++)
	393	free_page((unsigned long)phys_to_virt(tx_desc[i].buf_addr));
	394
	395	for (i = 0; i < RX_BUF_COUNT; i++)
	396	free_page((unsigned long)phys_to_virt(rx_desc[i].buf_addr));
15d014d1	397	}