[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/mach-types.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 = dev_alloc_skb(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]);

			skb->dev->last_rx = jiffies;

			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;

	/* @@@ Have to stop polling when nds[0] is administratively
	 * downed while we are polling.  */
	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(dev, 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(dev, &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/mach-types.h>
	20	#include <asm/io.h>
	21	#include "ixp2400_rx.ucode"
	22	#include "ixp2400_tx.ucode"
	23	#include "ixpdev_priv.h"
	24	#include "ixpdev.h"
	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;
	45
	46	if (unlikely(skb->len > PAGE_SIZE)) {
	47	/* @@@ Count drops. */
	48	dev_kfree_skb(skb);
	49	return 0;
	50	}
	51
	52	entry = tx_pointer;
	53	tx_pointer = (tx_pointer + 1) % TX_BUF_COUNT;
	54
	55	desc = tx_desc + entry;
	56	desc->pkt_length = skb->len;
	57	desc->channel = ip->channel;
	58
	59	skb_copy_and_csum_dev(skb, phys_to_virt(desc->buf_addr));
	60	dev_kfree_skb(skb);
	61
	62	ixp2000_reg_write(RING_TX_PENDING,
	63	TX_BUF_DESC_BASE + (entry * sizeof(struct ixpdev_tx_desc)));
	64
	65	dev->trans_start = jiffies;
	66
	67	local_irq_disable();
	68	ip->tx_queue_entries++;
	69	if (ip->tx_queue_entries == TX_BUF_COUNT_PER_CHAN)
	70	netif_stop_queue(dev);
	71	local_irq_enable();
	72
	73	return 0;
	74	}
	75
	76
bea3348e	77	static int ixpdev_rx(struct net_device *dev, int processed, int budget)
15d014d1	78	{
bea3348e	79	while (processed < budget) {
15d014d1 LB	80	struct ixpdev_rx_desc *desc;
	81	struct sk_buff *skb;
	82	void *buf;
	83	u32 _desc;
	84
	85	_desc = ixp2000_reg_read(RING_RX_DONE);
	86	if (_desc == 0)
	87	return 0;
	88
	89	desc = rx_desc +
	90	((_desc - RX_BUF_DESC_BASE) / sizeof(struct ixpdev_rx_desc));
	91	buf = phys_to_virt(desc->buf_addr);
	92
	93	if (desc->pkt_length < 4 \|\| desc->pkt_length > PAGE_SIZE) {
	94	printk(KERN_ERR "ixp2000: rx err, length %d\n",
	95	desc->pkt_length);
	96	goto err;
	97	}
	98
	99	if (desc->channel < 0 \|\| desc->channel >= nds_count) {
	100	printk(KERN_ERR "ixp2000: rx err, channel %d\n",
	101	desc->channel);
	102	goto err;
	103	}
	104
	105	/* @@@ Make FCS stripping configurable. */
	106	desc->pkt_length -= 4;
	107
	108	if (unlikely(!netif_running(nds[desc->channel])))
	109	goto err;
	110
	111	skb = dev_alloc_skb(desc->pkt_length + 2);
	112	if (likely(skb != NULL)) {
15d014d1	113	skb_reserve(skb, 2);
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 LB	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);
bea3348e	125	processed++;
15d014d1 LB	126	}
15d014d1 LB	127
bea3348e	128	return processed;
15d014d1 LB	129	}
	130
	131	/* dev always points to nds[0]. */
bea3348e	132	static int ixpdev_poll(struct napi_struct *napi, int budget)
15d014d1	133	{
bea3348e SH	134	struct ixpdev_priv *ip = container_of(napi, struct ixpdev_priv, napi);
	135	struct net_device *dev = ip->dev;
	136	int rx;
	137
15d014d1 LB	138	/* @@@ Have to stop polling when nds[0] is administratively
15d014d1 LB	139	* downed while we are polling. */
bea3348e	140	rx = 0;
15d014d1 LB	141	do {
	142	ixp2000_reg_write(IXP2000_IRQ_THD_RAW_STATUS_A_0, 0x00ff);
	143
bea3348e SH	144	rx = ixpdev_rx(dev, rx, budget);
	145	if (rx >= budget)
	146	break;
15d014d1 LB	147	} while (ixp2000_reg_read(IXP2000_IRQ_THD_RAW_STATUS_A_0) & 0x00ff);
15d014d1 LB	148
bea3348e	149	netif_rx_complete(dev, napi);
15d014d1 LB	150	ixp2000_reg_write(IXP2000_IRQ_THD_ENABLE_SET_A_0, 0x00ff);
15d014d1 LB	151
bea3348e	152	return rx;
15d014d1 LB	153	}
15d014d1 LB	154
15d014d1 LB	155	static void ixpdev_tx_complete(void)
	156	{
	157	int channel;
	158	u32 wake;
	159
	160	wake = 0;
	161	while (1) {
	162	struct ixpdev_priv *ip;
	163	u32 desc;
	164	int entry;
	165
	166	desc = ixp2000_reg_read(RING_TX_DONE);
	167	if (desc == 0)
	168	break;
	169
	170	/* @@@ Check whether entries come back in order. */
	171	entry = (desc - TX_BUF_DESC_BASE) / sizeof(struct ixpdev_tx_desc);
	172	channel = tx_desc[entry].channel;
	173
	174	if (channel < 0 \|\| channel >= nds_count) {
	175	printk(KERN_ERR "ixp2000: txcomp channel index "
	176	"out of bounds (%d, %.8i, %d)\n",
	177	channel, (unsigned int)desc, entry);
	178	continue;
	179	}
	180
	181	ip = netdev_priv(nds[channel]);
	182	if (ip->tx_queue_entries == TX_BUF_COUNT_PER_CHAN)
	183	wake \|= 1 << channel;
	184	ip->tx_queue_entries--;
	185	}
	186
	187	for (channel = 0; wake != 0; channel++) {
	188	if (wake & (1 << channel)) {
	189	netif_wake_queue(nds[channel]);
	190	wake &= ~(1 << channel);
	191	}
	192	}
	193	}
	194
7d12e780	195	static irqreturn_t ixpdev_interrupt(int irq, void *dev_id)
15d014d1 LB	196	{
	197	u32 status;
	198
	199	status = ixp2000_reg_read(IXP2000_IRQ_THD_STATUS_A_0);
	200	if (status == 0)
	201	return IRQ_NONE;
	202
	203	/*
	204	* Any of the eight receive units signaled RX?
	205	*/
	206	if (status & 0x00ff) {
bea3348e SH	207	struct net_device *dev = nds[0];
	208	struct ixpdev_priv *ip = netdev_priv(dev);
	209
15d014d1	210	ixp2000_reg_wrb(IXP2000_IRQ_THD_ENABLE_CLEAR_A_0, 0x00ff);
bea3348e SH	211	if (likely(napi_schedule_prep(&ip->napi))) {
bea3348e SH	212	__netif_rx_schedule(dev, &ip->napi);
15d014d1 LB	213	} else {
	214	printk(KERN_CRIT "ixp2000: irq while polling!!\n");
	215	}
	216	}
	217
	218	/*
	219	* Any of the eight transmit units signaled TXdone?
	220	*/
	221	if (status & 0xff00) {
	222	ixp2000_reg_wrb(IXP2000_IRQ_THD_RAW_STATUS_A_0, 0xff00);
	223	ixpdev_tx_complete();
	224	}
	225
	226	return IRQ_HANDLED;
	227	}
	228
8ce51d69 LB	229	#ifdef CONFIG_NET_POLL_CONTROLLER
	230	static void ixpdev_poll_controller(struct net_device *dev)
	231	{
	232	disable_irq(IRQ_IXP2000_THDA0);
0da2f0f1	233	ixpdev_interrupt(IRQ_IXP2000_THDA0, dev);
8ce51d69 LB	234	enable_irq(IRQ_IXP2000_THDA0);
	235	}
	236	#endif
	237
15d014d1 LB	238	static int ixpdev_open(struct net_device *dev)
	239	{
	240	struct ixpdev_priv *ip = netdev_priv(dev);
	241	int err;
	242
bea3348e	243	napi_enable(&ip->napi);
15d014d1 LB	244	if (!nds_open++) {
15d014d1 LB	245	err = request_irq(IRQ_IXP2000_THDA0, ixpdev_interrupt,
1fb9df5d	246	IRQF_SHARED, "ixp2000_eth", nds);
15d014d1 LB	247	if (err) {
15d014d1 LB	248	nds_open--;
bea3348e	249	napi_disable(&ip->napi);
15d014d1 LB	250	return err;
	251	}
	252
	253	ixp2000_reg_write(IXP2000_IRQ_THD_ENABLE_SET_A_0, 0xffff);
	254	}
	255
	256	set_port_admin_status(ip->channel, 1);
	257	netif_start_queue(dev);
	258
	259	return 0;
	260	}
	261
	262	static int ixpdev_close(struct net_device *dev)
	263	{
	264	struct ixpdev_priv *ip = netdev_priv(dev);
	265
	266	netif_stop_queue(dev);
bea3348e	267	napi_disable(&ip->napi);
15d014d1 LB	268	set_port_admin_status(ip->channel, 0);
	269
	270	if (!--nds_open) {
	271	ixp2000_reg_write(IXP2000_IRQ_THD_ENABLE_CLEAR_A_0, 0xffff);
	272	free_irq(IRQ_IXP2000_THDA0, nds);
	273	}
	274
	275	return 0;
	276	}
	277
	278	struct net_device *ixpdev_alloc(int channel, int sizeof_priv)
	279	{
	280	struct net_device *dev;
	281	struct ixpdev_priv *ip;
	282
	283	dev = alloc_etherdev(sizeof_priv);
	284	if (dev == NULL)
	285	return NULL;
	286
	287	dev->hard_start_xmit = ixpdev_xmit;
15d014d1 LB	288	dev->open = ixpdev_open;
15d014d1 LB	289	dev->stop = ixpdev_close;
8ce51d69 LB	290	#ifdef CONFIG_NET_POLL_CONTROLLER
	291	dev->poll_controller = ixpdev_poll_controller;
	292	#endif
15d014d1 LB	293
15d014d1 LB	294	dev->features \|= NETIF_F_SG \| NETIF_F_HW_CSUM;
15d014d1 LB	295
15d014d1 LB	296	ip = netdev_priv(dev);
bea3348e SH	297	ip->dev = dev;
bea3348e SH	298	netif_napi_add(dev, &ip->napi, ixpdev_poll, 64);
15d014d1 LB	299	ip->channel = channel;
	300	ip->tx_queue_entries = 0;
	301
	302	return dev;
	303	}
	304
	305	int ixpdev_init(int __nds_count, struct net_device **__nds,
	306	void (*__set_port_admin_status)(int port, int up))
	307	{
	308	int i;
	309	int err;
	310
5d4fe2c1	311	BUILD_BUG_ON(RX_BUF_COUNT > 192 \|\| TX_BUF_COUNT > 192);
15d014d1	312
12747784 LB	313	printk(KERN_INFO "IXP2000 MSF ethernet driver %s\n", DRV_MODULE_VERSION);
12747784 LB	314
15d014d1 LB	315	nds_count = __nds_count;
	316	nds = __nds;
	317	set_port_admin_status = __set_port_admin_status;
	318
15d014d1 LB	319	for (i = 0; i < RX_BUF_COUNT; i++) {
	320	void *buf;
	321
	322	buf = (void *)get_zeroed_page(GFP_KERNEL);
	323	if (buf == NULL) {
	324	err = -ENOMEM;
	325	while (--i >= 0)
	326	free_page((unsigned long)phys_to_virt(rx_desc[i].buf_addr));
0c49919a	327	goto err_out;
15d014d1 LB	328	}
	329	rx_desc[i].buf_addr = virt_to_phys(buf);
	330	rx_desc[i].buf_length = PAGE_SIZE;
	331	}
	332
	333	/* @@@ Maybe we shouldn't be preallocating TX buffers. */
	334	for (i = 0; i < TX_BUF_COUNT; i++) {
	335	void *buf;
	336
	337	buf = (void *)get_zeroed_page(GFP_KERNEL);
	338	if (buf == NULL) {
	339	err = -ENOMEM;
	340	while (--i >= 0)
	341	free_page((unsigned long)phys_to_virt(tx_desc[i].buf_addr));
	342	goto err_free_rx;
	343	}
	344	tx_desc[i].buf_addr = virt_to_phys(buf);
	345	}
	346
	347	/* 256 entries, ring status set means 'empty', base address 0x0000. */
	348	ixp2000_reg_write(RING_RX_PENDING_BASE, 0x44000000);
	349	ixp2000_reg_write(RING_RX_PENDING_HEAD, 0x00000000);
	350	ixp2000_reg_write(RING_RX_PENDING_TAIL, 0x00000000);
	351
	352	/* 256 entries, ring status set means 'full', base address 0x0400. */
	353	ixp2000_reg_write(RING_RX_DONE_BASE, 0x40000400);
	354	ixp2000_reg_write(RING_RX_DONE_HEAD, 0x00000000);
	355	ixp2000_reg_write(RING_RX_DONE_TAIL, 0x00000000);
	356
	357	for (i = 0; i < RX_BUF_COUNT; i++) {
	358	ixp2000_reg_write(RING_RX_PENDING,
	359	RX_BUF_DESC_BASE + (i * sizeof(struct ixpdev_rx_desc)));
	360	}
	361
	362	ixp2000_uengine_load(0, &ixp2400_rx);
	363	ixp2000_uengine_start_contexts(0, 0xff);
	364
15d014d1 LB	365	/* 256 entries, ring status set means 'empty', base address 0x0800. */
	366	ixp2000_reg_write(RING_TX_PENDING_BASE, 0x44000800);
	367	ixp2000_reg_write(RING_TX_PENDING_HEAD, 0x00000000);
	368	ixp2000_reg_write(RING_TX_PENDING_TAIL, 0x00000000);
	369
	370	/* 256 entries, ring status set means 'full', base address 0x0c00. */
	371	ixp2000_reg_write(RING_TX_DONE_BASE, 0x40000c00);
	372	ixp2000_reg_write(RING_TX_DONE_HEAD, 0x00000000);
	373	ixp2000_reg_write(RING_TX_DONE_TAIL, 0x00000000);
	374
	375	ixp2000_uengine_load(1, &ixp2400_tx);
	376	ixp2000_uengine_start_contexts(1, 0xff);
	377
0c49919a LB	378	for (i = 0; i < nds_count; i++) {
	379	err = register_netdev(nds[i]);
	380	if (err) {
	381	while (--i >= 0)
	382	unregister_netdev(nds[i]);
	383	goto err_free_tx;
	384	}
	385	}
	386
7ed98bfd LB	387	for (i = 0; i < nds_count; i++) {
	388	printk(KERN_INFO "%s: IXP2000 MSF ethernet (port %d), "
	389	"%.2x:%.2x:%.2x:%.2x:%.2x:%.2x.\n", nds[i]->name, i,
	390	nds[i]->dev_addr[0], nds[i]->dev_addr[1],
	391	nds[i]->dev_addr[2], nds[i]->dev_addr[3],
	392	nds[i]->dev_addr[4], nds[i]->dev_addr[5]);
	393	}
	394
15d014d1 LB	395	return 0;
15d014d1 LB	396
0c49919a LB	397	err_free_tx:
	398	for (i = 0; i < TX_BUF_COUNT; i++)
	399	free_page((unsigned long)phys_to_virt(tx_desc[i].buf_addr));
	400
15d014d1 LB	401	err_free_rx:
	402	for (i = 0; i < RX_BUF_COUNT; i++)
	403	free_page((unsigned long)phys_to_virt(rx_desc[i].buf_addr));
	404
15d014d1 LB	405	err_out:
	406	return err;
	407	}
	408
	409	void ixpdev_deinit(void)
	410	{
	411	int i;
	412
	413	/* @@@ Flush out pending packets. */
	414
0c49919a LB	415	for (i = 0; i < nds_count; i++)
	416	unregister_netdev(nds[i]);
	417
15d014d1 LB	418	ixp2000_uengine_stop_contexts(1, 0xff);
	419	ixp2000_uengine_stop_contexts(0, 0xff);
	420	ixp2000_uengine_reset(0x3);
	421
	422	for (i = 0; i < TX_BUF_COUNT; i++)
	423	free_page((unsigned long)phys_to_virt(tx_desc[i].buf_addr));
	424
	425	for (i = 0; i < RX_BUF_COUNT; i++)
	426	free_page((unsigned long)phys_to_virt(rx_desc[i].buf_addr));
15d014d1	427	}