[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"

#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(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);

	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 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,
#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"
	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;
4871953c	44	unsigned long flags;
15d014d1 LB	45
	46	if (unlikely(skb->len > PAGE_SIZE)) {
	47	/* @@@ Count drops. */
	48	dev_kfree_skb(skb);
6ed10654	49	return NETDEV_TX_OK;
15d014d1 LB	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
4871953c	67	local_irq_save(flags);
15d014d1 LB	68	ip->tx_queue_entries++;
	69	if (ip->tx_queue_entries == TX_BUF_COUNT_PER_CHAN)
	70	netif_stop_queue(dev);
4871953c	71	local_irq_restore(flags);
15d014d1	72
6ed10654	73	return NETDEV_TX_OK;
15d014d1 LB	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
d27e7c3f	111	skb = netdev_alloc_skb(dev, desc->pkt_length + 2);
15d014d1	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	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
e7090e34 AB	274	static const struct net_device_ops ixpdev_netdev_ops = {
	275	.ndo_open = ixpdev_open,
	276	.ndo_stop = ixpdev_close,
	277	.ndo_start_xmit = ixpdev_xmit,
	278	.ndo_change_mtu = eth_change_mtu,
	279	.ndo_validate_addr = eth_validate_addr,
	280	.ndo_set_mac_address = eth_mac_addr,
	281	#ifdef CONFIG_NET_POLL_CONTROLLER
	282	.ndo_poll_controller = ixpdev_poll_controller,
	283	#endif
	284	};
	285
15d014d1 LB	286	struct net_device *ixpdev_alloc(int channel, int sizeof_priv)
	287	{
	288	struct net_device *dev;
	289	struct ixpdev_priv *ip;
	290
	291	dev = alloc_etherdev(sizeof_priv);
	292	if (dev == NULL)
	293	return NULL;
	294
e7090e34	295	dev->netdev_ops = &ixpdev_netdev_ops;
15d014d1 LB	296
15d014d1 LB	297	dev->features \|= NETIF_F_SG \| NETIF_F_HW_CSUM;
15d014d1 LB	298
15d014d1 LB	299	ip = netdev_priv(dev);
bea3348e SH	300	ip->dev = dev;
bea3348e SH	301	netif_napi_add(dev, &ip->napi, ixpdev_poll, 64);
15d014d1 LB	302	ip->channel = channel;
	303	ip->tx_queue_entries = 0;
	304
	305	return dev;
	306	}
	307
	308	int ixpdev_init(int __nds_count, struct net_device **__nds,
	309	void (*__set_port_admin_status)(int port, int up))
	310	{
	311	int i;
	312	int err;
	313
5d4fe2c1	314	BUILD_BUG_ON(RX_BUF_COUNT > 192 \|\| TX_BUF_COUNT > 192);
15d014d1	315
12747784 LB	316	printk(KERN_INFO "IXP2000 MSF ethernet driver %s\n", DRV_MODULE_VERSION);
12747784 LB	317
15d014d1 LB	318	nds_count = __nds_count;
	319	nds = __nds;
	320	set_port_admin_status = __set_port_admin_status;
	321
15d014d1 LB	322	for (i = 0; i < RX_BUF_COUNT; i++) {
	323	void *buf;
	324
	325	buf = (void *)get_zeroed_page(GFP_KERNEL);
	326	if (buf == NULL) {
	327	err = -ENOMEM;
	328	while (--i >= 0)
	329	free_page((unsigned long)phys_to_virt(rx_desc[i].buf_addr));
0c49919a	330	goto err_out;
15d014d1 LB	331	}
	332	rx_desc[i].buf_addr = virt_to_phys(buf);
	333	rx_desc[i].buf_length = PAGE_SIZE;
	334	}
	335
	336	/* @@@ Maybe we shouldn't be preallocating TX buffers. */
	337	for (i = 0; i < TX_BUF_COUNT; i++) {
	338	void *buf;
	339
	340	buf = (void *)get_zeroed_page(GFP_KERNEL);
	341	if (buf == NULL) {
	342	err = -ENOMEM;
	343	while (--i >= 0)
	344	free_page((unsigned long)phys_to_virt(tx_desc[i].buf_addr));
	345	goto err_free_rx;
	346	}
	347	tx_desc[i].buf_addr = virt_to_phys(buf);
	348	}
	349
	350	/* 256 entries, ring status set means 'empty', base address 0x0000. */
	351	ixp2000_reg_write(RING_RX_PENDING_BASE, 0x44000000);
	352	ixp2000_reg_write(RING_RX_PENDING_HEAD, 0x00000000);
	353	ixp2000_reg_write(RING_RX_PENDING_TAIL, 0x00000000);
	354
	355	/* 256 entries, ring status set means 'full', base address 0x0400. */
	356	ixp2000_reg_write(RING_RX_DONE_BASE, 0x40000400);
	357	ixp2000_reg_write(RING_RX_DONE_HEAD, 0x00000000);
	358	ixp2000_reg_write(RING_RX_DONE_TAIL, 0x00000000);
	359
	360	for (i = 0; i < RX_BUF_COUNT; i++) {
	361	ixp2000_reg_write(RING_RX_PENDING,
	362	RX_BUF_DESC_BASE + (i * sizeof(struct ixpdev_rx_desc)));
	363	}
	364
	365	ixp2000_uengine_load(0, &ixp2400_rx);
	366	ixp2000_uengine_start_contexts(0, 0xff);
	367
15d014d1 LB	368	/* 256 entries, ring status set means 'empty', base address 0x0800. */
	369	ixp2000_reg_write(RING_TX_PENDING_BASE, 0x44000800);
	370	ixp2000_reg_write(RING_TX_PENDING_HEAD, 0x00000000);
	371	ixp2000_reg_write(RING_TX_PENDING_TAIL, 0x00000000);
	372
	373	/* 256 entries, ring status set means 'full', base address 0x0c00. */
	374	ixp2000_reg_write(RING_TX_DONE_BASE, 0x40000c00);
	375	ixp2000_reg_write(RING_TX_DONE_HEAD, 0x00000000);
	376	ixp2000_reg_write(RING_TX_DONE_TAIL, 0x00000000);
	377
	378	ixp2000_uengine_load(1, &ixp2400_tx);
	379	ixp2000_uengine_start_contexts(1, 0xff);
	380
0c49919a LB	381	for (i = 0; i < nds_count; i++) {
	382	err = register_netdev(nds[i]);
	383	if (err) {
	384	while (--i >= 0)
	385	unregister_netdev(nds[i]);
	386	goto err_free_tx;
	387	}
	388	}
	389
7ed98bfd LB	390	for (i = 0; i < nds_count; i++) {
	391	printk(KERN_INFO "%s: IXP2000 MSF ethernet (port %d), "
	392	"%.2x:%.2x:%.2x:%.2x:%.2x:%.2x.\n", nds[i]->name, i,
	393	nds[i]->dev_addr[0], nds[i]->dev_addr[1],
	394	nds[i]->dev_addr[2], nds[i]->dev_addr[3],
	395	nds[i]->dev_addr[4], nds[i]->dev_addr[5]);
	396	}
	397
15d014d1 LB	398	return 0;
15d014d1 LB	399
0c49919a LB	400	err_free_tx:
	401	for (i = 0; i < TX_BUF_COUNT; i++)
	402	free_page((unsigned long)phys_to_virt(tx_desc[i].buf_addr));
	403
15d014d1 LB	404	err_free_rx:
	405	for (i = 0; i < RX_BUF_COUNT; i++)
	406	free_page((unsigned long)phys_to_virt(rx_desc[i].buf_addr));
	407
15d014d1 LB	408	err_out:
	409	return err;
	410	}
	411
	412	void ixpdev_deinit(void)
	413	{
	414	int i;
	415
	416	/* @@@ Flush out pending packets. */
	417
0c49919a LB	418	for (i = 0; i < nds_count; i++)
	419	unregister_netdev(nds[i]);
	420
15d014d1 LB	421	ixp2000_uengine_stop_contexts(1, 0xff);
	422	ixp2000_uengine_stop_contexts(0, 0xff);
	423	ixp2000_uengine_reset(0x3);
	424
	425	for (i = 0; i < TX_BUF_COUNT; i++)
	426	free_page((unsigned long)phys_to_virt(tx_desc[i].buf_addr));
	427
	428	for (i = 0; i < RX_BUF_COUNT; i++)
	429	free_page((unsigned long)phys_to_virt(rx_desc[i].buf_addr));
15d014d1	430	}