[mirror_ubuntu-bionic-kernel.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 <linux/gfp.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>
5a0e3ad6	18	#include <linux/gfp.h>
18ec5c73	19	#include <asm/hardware/uengine.h>
15d014d1 LB	20	#include <asm/io.h>
	21	#include "ixp2400_rx.ucode"
	22	#include "ixp2400_tx.ucode"
	23	#include "ixpdev_priv.h"
	24	#include "ixpdev.h"
b9696ea3	25	#include "pm3386.h"
15d014d1	26
12747784 LB	27	#define DRV_MODULE_VERSION "0.2"
12747784 LB	28
15d014d1 LB	29	static int nds_count;
	30	static struct net_device **nds;
	31	static int nds_open;
	32	static void (*set_port_admin_status)(int port, int up);
	33
	34	static struct ixpdev_rx_desc * const rx_desc =
	35	(struct ixpdev_rx_desc *)(IXP2000_SRAM0_VIRT_BASE + RX_BUF_DESC_BASE);
	36	static struct ixpdev_tx_desc * const tx_desc =
	37	(struct ixpdev_tx_desc *)(IXP2000_SRAM0_VIRT_BASE + TX_BUF_DESC_BASE);
	38	static int tx_pointer;
	39
	40
	41	static int ixpdev_xmit(struct sk_buff skb, struct net_device dev)
	42	{
	43	struct ixpdev_priv *ip = netdev_priv(dev);
	44	struct ixpdev_tx_desc *desc;
	45	int entry;
4871953c	46	unsigned long flags;
15d014d1 LB	47
	48	if (unlikely(skb->len > PAGE_SIZE)) {
	49	/* @@@ Count drops. */
	50	dev_kfree_skb(skb);
6ed10654	51	return NETDEV_TX_OK;
15d014d1 LB	52	}
	53
	54	entry = tx_pointer;
	55	tx_pointer = (tx_pointer + 1) % TX_BUF_COUNT;
	56
	57	desc = tx_desc + entry;
	58	desc->pkt_length = skb->len;
	59	desc->channel = ip->channel;
	60
	61	skb_copy_and_csum_dev(skb, phys_to_virt(desc->buf_addr));
	62	dev_kfree_skb(skb);
	63
	64	ixp2000_reg_write(RING_TX_PENDING,
	65	TX_BUF_DESC_BASE + (entry * sizeof(struct ixpdev_tx_desc)));
	66
	67	dev->trans_start = jiffies;
	68
4871953c	69	local_irq_save(flags);
15d014d1 LB	70	ip->tx_queue_entries++;
	71	if (ip->tx_queue_entries == TX_BUF_COUNT_PER_CHAN)
	72	netif_stop_queue(dev);
4871953c	73	local_irq_restore(flags);
15d014d1	74
6ed10654	75	return NETDEV_TX_OK;
15d014d1 LB	76	}
	77
	78
bea3348e	79	static int ixpdev_rx(struct net_device *dev, int processed, int budget)
15d014d1	80	{
bea3348e	81	while (processed < budget) {
15d014d1 LB	82	struct ixpdev_rx_desc *desc;
	83	struct sk_buff *skb;
	84	void *buf;
	85	u32 _desc;
	86
	87	_desc = ixp2000_reg_read(RING_RX_DONE);
	88	if (_desc == 0)
	89	return 0;
	90
	91	desc = rx_desc +
	92	((_desc - RX_BUF_DESC_BASE) / sizeof(struct ixpdev_rx_desc));
	93	buf = phys_to_virt(desc->buf_addr);
	94
	95	if (desc->pkt_length < 4 \|\| desc->pkt_length > PAGE_SIZE) {
	96	printk(KERN_ERR "ixp2000: rx err, length %d\n",
	97	desc->pkt_length);
	98	goto err;
	99	}
	100
	101	if (desc->channel < 0 \|\| desc->channel >= nds_count) {
	102	printk(KERN_ERR "ixp2000: rx err, channel %d\n",
	103	desc->channel);
	104	goto err;
	105	}
	106
	107	/* @@@ Make FCS stripping configurable. */
	108	desc->pkt_length -= 4;
	109
	110	if (unlikely(!netif_running(nds[desc->channel])))
	111	goto err;
	112
89d71a66	113	skb = netdev_alloc_skb_ip_align(dev, desc->pkt_length);
15d014d1	114	if (likely(skb != NULL)) {
8c7b7faa	115	skb_copy_to_linear_data(skb, buf, desc->pkt_length);
15d014d1	116	skb_put(skb, desc->pkt_length);
4c13eb66	117	skb->protocol = eth_type_trans(skb, nds[desc->channel]);
15d014d1	118
15d014d1 LB	119	netif_receive_skb(skb);
	120	}
	121
	122	err:
	123	ixp2000_reg_write(RING_RX_PENDING, _desc);
bea3348e	124	processed++;
15d014d1 LB	125	}
15d014d1 LB	126
bea3348e	127	return processed;
15d014d1 LB	128	}
	129
	130	/* dev always points to nds[0]. */
bea3348e	131	static int ixpdev_poll(struct napi_struct *napi, int budget)
15d014d1	132	{
bea3348e SH	133	struct ixpdev_priv *ip = container_of(napi, struct ixpdev_priv, napi);
	134	struct net_device *dev = ip->dev;
	135	int rx;
	136
bea3348e	137	rx = 0;
15d014d1 LB	138	do {
	139	ixp2000_reg_write(IXP2000_IRQ_THD_RAW_STATUS_A_0, 0x00ff);
	140
bea3348e SH	141	rx = ixpdev_rx(dev, rx, budget);
	142	if (rx >= budget)
	143	break;
15d014d1 LB	144	} while (ixp2000_reg_read(IXP2000_IRQ_THD_RAW_STATUS_A_0) & 0x00ff);
15d014d1 LB	145
288379f0	146	napi_complete(napi);
15d014d1 LB	147	ixp2000_reg_write(IXP2000_IRQ_THD_ENABLE_SET_A_0, 0x00ff);
15d014d1 LB	148
bea3348e	149	return rx;
15d014d1 LB	150	}
15d014d1 LB	151
15d014d1 LB	152	static void ixpdev_tx_complete(void)
	153	{
	154	int channel;
	155	u32 wake;
	156
	157	wake = 0;
	158	while (1) {
	159	struct ixpdev_priv *ip;
	160	u32 desc;
	161	int entry;
	162
	163	desc = ixp2000_reg_read(RING_TX_DONE);
	164	if (desc == 0)
	165	break;
	166
	167	/* @@@ Check whether entries come back in order. */
	168	entry = (desc - TX_BUF_DESC_BASE) / sizeof(struct ixpdev_tx_desc);
	169	channel = tx_desc[entry].channel;
	170
	171	if (channel < 0 \|\| channel >= nds_count) {
	172	printk(KERN_ERR "ixp2000: txcomp channel index "
	173	"out of bounds (%d, %.8i, %d)\n",
	174	channel, (unsigned int)desc, entry);
	175	continue;
	176	}
	177
	178	ip = netdev_priv(nds[channel]);
	179	if (ip->tx_queue_entries == TX_BUF_COUNT_PER_CHAN)
	180	wake \|= 1 << channel;
	181	ip->tx_queue_entries--;
	182	}
	183
	184	for (channel = 0; wake != 0; channel++) {
	185	if (wake & (1 << channel)) {
	186	netif_wake_queue(nds[channel]);
	187	wake &= ~(1 << channel);
	188	}
	189	}
	190	}
	191
7d12e780	192	static irqreturn_t ixpdev_interrupt(int irq, void *dev_id)
15d014d1 LB	193	{
	194	u32 status;
	195
	196	status = ixp2000_reg_read(IXP2000_IRQ_THD_STATUS_A_0);
	197	if (status == 0)
	198	return IRQ_NONE;
	199
	200	/*
	201	* Any of the eight receive units signaled RX?
	202	*/
	203	if (status & 0x00ff) {
bea3348e SH	204	struct net_device *dev = nds[0];
	205	struct ixpdev_priv *ip = netdev_priv(dev);
	206
15d014d1	207	ixp2000_reg_wrb(IXP2000_IRQ_THD_ENABLE_CLEAR_A_0, 0x00ff);
bea3348e	208	if (likely(napi_schedule_prep(&ip->napi))) {
288379f0	209	__napi_schedule(&ip->napi);
15d014d1 LB	210	} else {
	211	printk(KERN_CRIT "ixp2000: irq while polling!!\n");
	212	}
	213	}
	214
	215	/*
	216	* Any of the eight transmit units signaled TXdone?
	217	*/
	218	if (status & 0xff00) {
	219	ixp2000_reg_wrb(IXP2000_IRQ_THD_RAW_STATUS_A_0, 0xff00);
	220	ixpdev_tx_complete();
	221	}
	222
	223	return IRQ_HANDLED;
	224	}
	225
8ce51d69 LB	226	#ifdef CONFIG_NET_POLL_CONTROLLER
	227	static void ixpdev_poll_controller(struct net_device *dev)
	228	{
	229	disable_irq(IRQ_IXP2000_THDA0);
0da2f0f1	230	ixpdev_interrupt(IRQ_IXP2000_THDA0, dev);
8ce51d69 LB	231	enable_irq(IRQ_IXP2000_THDA0);
	232	}
	233	#endif
	234
15d014d1 LB	235	static int ixpdev_open(struct net_device *dev)
	236	{
	237	struct ixpdev_priv *ip = netdev_priv(dev);
	238	int err;
	239
bea3348e	240	napi_enable(&ip->napi);
15d014d1 LB	241	if (!nds_open++) {
15d014d1 LB	242	err = request_irq(IRQ_IXP2000_THDA0, ixpdev_interrupt,
1fb9df5d	243	IRQF_SHARED, "ixp2000_eth", nds);
15d014d1 LB	244	if (err) {
15d014d1 LB	245	nds_open--;
bea3348e	246	napi_disable(&ip->napi);
15d014d1 LB	247	return err;
	248	}
	249
	250	ixp2000_reg_write(IXP2000_IRQ_THD_ENABLE_SET_A_0, 0xffff);
	251	}
	252
	253	set_port_admin_status(ip->channel, 1);
	254	netif_start_queue(dev);
	255
	256	return 0;
	257	}
	258
	259	static int ixpdev_close(struct net_device *dev)
	260	{
	261	struct ixpdev_priv *ip = netdev_priv(dev);
	262
	263	netif_stop_queue(dev);
bea3348e	264	napi_disable(&ip->napi);
15d014d1 LB	265	set_port_admin_status(ip->channel, 0);
	266
	267	if (!--nds_open) {
	268	ixp2000_reg_write(IXP2000_IRQ_THD_ENABLE_CLEAR_A_0, 0xffff);
	269	free_irq(IRQ_IXP2000_THDA0, nds);
	270	}
	271
	272	return 0;
	273	}
	274
b9696ea3 VS	275	static struct net_device_stats ixpdev_get_stats(struct net_device dev)
	276	{
	277	struct ixpdev_priv *ip = netdev_priv(dev);
	278
	279	pm3386_get_stats(ip->channel, &(dev->stats));
	280
	281	return &(dev->stats);
	282	}
	283
e7090e34 AB	284	static const struct net_device_ops ixpdev_netdev_ops = {
	285	.ndo_open = ixpdev_open,
	286	.ndo_stop = ixpdev_close,
	287	.ndo_start_xmit = ixpdev_xmit,
	288	.ndo_change_mtu = eth_change_mtu,
	289	.ndo_validate_addr = eth_validate_addr,
	290	.ndo_set_mac_address = eth_mac_addr,
b9696ea3	291	.ndo_get_stats = ixpdev_get_stats,
e7090e34 AB	292	#ifdef CONFIG_NET_POLL_CONTROLLER
	293	.ndo_poll_controller = ixpdev_poll_controller,
	294	#endif
	295	};
	296
15d014d1 LB	297	struct net_device *ixpdev_alloc(int channel, int sizeof_priv)
	298	{
	299	struct net_device *dev;
	300	struct ixpdev_priv *ip;
	301
	302	dev = alloc_etherdev(sizeof_priv);
	303	if (dev == NULL)
	304	return NULL;
	305
e7090e34	306	dev->netdev_ops = &ixpdev_netdev_ops;
15d014d1 LB	307
15d014d1 LB	308	dev->features \|= NETIF_F_SG \| NETIF_F_HW_CSUM;
15d014d1 LB	309
15d014d1 LB	310	ip = netdev_priv(dev);
bea3348e SH	311	ip->dev = dev;
bea3348e SH	312	netif_napi_add(dev, &ip->napi, ixpdev_poll, 64);
15d014d1 LB	313	ip->channel = channel;
	314	ip->tx_queue_entries = 0;
	315
	316	return dev;
	317	}
	318
	319	int ixpdev_init(int __nds_count, struct net_device **__nds,
	320	void (*__set_port_admin_status)(int port, int up))
	321	{
	322	int i;
	323	int err;
	324
5d4fe2c1	325	BUILD_BUG_ON(RX_BUF_COUNT > 192 \|\| TX_BUF_COUNT > 192);
15d014d1	326
12747784 LB	327	printk(KERN_INFO "IXP2000 MSF ethernet driver %s\n", DRV_MODULE_VERSION);
12747784 LB	328
15d014d1 LB	329	nds_count = __nds_count;
	330	nds = __nds;
	331	set_port_admin_status = __set_port_admin_status;
	332
15d014d1 LB	333	for (i = 0; i < RX_BUF_COUNT; i++) {
	334	void *buf;
	335
	336	buf = (void *)get_zeroed_page(GFP_KERNEL);
	337	if (buf == NULL) {
	338	err = -ENOMEM;
	339	while (--i >= 0)
	340	free_page((unsigned long)phys_to_virt(rx_desc[i].buf_addr));
0c49919a	341	goto err_out;
15d014d1 LB	342	}
	343	rx_desc[i].buf_addr = virt_to_phys(buf);
	344	rx_desc[i].buf_length = PAGE_SIZE;
	345	}
	346
	347	/* @@@ Maybe we shouldn't be preallocating TX buffers. */
	348	for (i = 0; i < TX_BUF_COUNT; i++) {
	349	void *buf;
	350
	351	buf = (void *)get_zeroed_page(GFP_KERNEL);
	352	if (buf == NULL) {
	353	err = -ENOMEM;
	354	while (--i >= 0)
	355	free_page((unsigned long)phys_to_virt(tx_desc[i].buf_addr));
	356	goto err_free_rx;
	357	}
	358	tx_desc[i].buf_addr = virt_to_phys(buf);
	359	}
	360
	361	/* 256 entries, ring status set means 'empty', base address 0x0000. */
	362	ixp2000_reg_write(RING_RX_PENDING_BASE, 0x44000000);
	363	ixp2000_reg_write(RING_RX_PENDING_HEAD, 0x00000000);
	364	ixp2000_reg_write(RING_RX_PENDING_TAIL, 0x00000000);
	365
	366	/* 256 entries, ring status set means 'full', base address 0x0400. */
	367	ixp2000_reg_write(RING_RX_DONE_BASE, 0x40000400);
	368	ixp2000_reg_write(RING_RX_DONE_HEAD, 0x00000000);
	369	ixp2000_reg_write(RING_RX_DONE_TAIL, 0x00000000);
	370
	371	for (i = 0; i < RX_BUF_COUNT; i++) {
	372	ixp2000_reg_write(RING_RX_PENDING,
	373	RX_BUF_DESC_BASE + (i * sizeof(struct ixpdev_rx_desc)));
	374	}
	375
	376	ixp2000_uengine_load(0, &ixp2400_rx);
	377	ixp2000_uengine_start_contexts(0, 0xff);
	378
15d014d1 LB	379	/* 256 entries, ring status set means 'empty', base address 0x0800. */
	380	ixp2000_reg_write(RING_TX_PENDING_BASE, 0x44000800);
	381	ixp2000_reg_write(RING_TX_PENDING_HEAD, 0x00000000);
	382	ixp2000_reg_write(RING_TX_PENDING_TAIL, 0x00000000);
	383
	384	/* 256 entries, ring status set means 'full', base address 0x0c00. */
	385	ixp2000_reg_write(RING_TX_DONE_BASE, 0x40000c00);
	386	ixp2000_reg_write(RING_TX_DONE_HEAD, 0x00000000);
	387	ixp2000_reg_write(RING_TX_DONE_TAIL, 0x00000000);
	388
	389	ixp2000_uengine_load(1, &ixp2400_tx);
	390	ixp2000_uengine_start_contexts(1, 0xff);
	391
0c49919a LB	392	for (i = 0; i < nds_count; i++) {
	393	err = register_netdev(nds[i]);
	394	if (err) {
	395	while (--i >= 0)
	396	unregister_netdev(nds[i]);
	397	goto err_free_tx;
	398	}
	399	}
	400
7ed98bfd LB	401	for (i = 0; i < nds_count; i++) {
	402	printk(KERN_INFO "%s: IXP2000 MSF ethernet (port %d), "
	403	"%.2x:%.2x:%.2x:%.2x:%.2x:%.2x.\n", nds[i]->name, i,
	404	nds[i]->dev_addr[0], nds[i]->dev_addr[1],
	405	nds[i]->dev_addr[2], nds[i]->dev_addr[3],
	406	nds[i]->dev_addr[4], nds[i]->dev_addr[5]);
	407	}
	408
15d014d1 LB	409	return 0;
15d014d1 LB	410
0c49919a LB	411	err_free_tx:
	412	for (i = 0; i < TX_BUF_COUNT; i++)
	413	free_page((unsigned long)phys_to_virt(tx_desc[i].buf_addr));
	414
15d014d1 LB	415	err_free_rx:
	416	for (i = 0; i < RX_BUF_COUNT; i++)
	417	free_page((unsigned long)phys_to_virt(rx_desc[i].buf_addr));
	418
15d014d1 LB	419	err_out:
	420	return err;
	421	}
	422
	423	void ixpdev_deinit(void)
	424	{
	425	int i;
	426
	427	/* @@@ Flush out pending packets. */
	428
0c49919a LB	429	for (i = 0; i < nds_count; i++)
	430	unregister_netdev(nds[i]);
	431
15d014d1 LB	432	ixp2000_uengine_stop_contexts(1, 0xff);
	433	ixp2000_uengine_stop_contexts(0, 0xff);
	434	ixp2000_uengine_reset(0x3);
	435
	436	for (i = 0; i < TX_BUF_COUNT; i++)
	437	free_page((unsigned long)phys_to_virt(tx_desc[i].buf_addr));
	438
	439	for (i = 0; i < RX_BUF_COUNT; i++)
	440	free_page((unsigned long)phys_to_virt(rx_desc[i].buf_addr));
15d014d1	441	}