1 files changed, 440 insertions, 0 deletions

diff --git a/drivers/net/ethernet/xscale/ixp2000/ixpdev.c b/drivers/net/ethernet/xscale/ixp2000/ixpdev.c
new file mode 100644
index 00000000000..e122493ab70
--- /dev/null
+++ b/drivers/net/ethernet/xscale/ixp2000/ixpdev.c
@@ -0,0 +1,440 @@
+/*
+ * 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/interrupt.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)));
+
+	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));
+}