440 lines
10 KiB
C
440 lines
10 KiB
C
/*
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* IXP2000 MSF network device driver
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* Copyright (C) 2004, 2005 Lennert Buytenhek <buytenh@wantstofly.org>
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* Dedicated to Marija Kulikova.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/init.h>
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#include <linux/moduleparam.h>
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#include <linux/gfp.h>
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#include <asm/hardware/uengine.h>
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#include <asm/io.h>
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#include "ixp2400_rx.ucode"
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#include "ixp2400_tx.ucode"
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#include "ixpdev_priv.h"
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#include "ixpdev.h"
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#include "pm3386.h"
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#define DRV_MODULE_VERSION "0.2"
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static int nds_count;
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static struct net_device **nds;
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static int nds_open;
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static void (*set_port_admin_status)(int port, int up);
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static struct ixpdev_rx_desc * const rx_desc =
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(struct ixpdev_rx_desc *)(IXP2000_SRAM0_VIRT_BASE + RX_BUF_DESC_BASE);
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static struct ixpdev_tx_desc * const tx_desc =
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(struct ixpdev_tx_desc *)(IXP2000_SRAM0_VIRT_BASE + TX_BUF_DESC_BASE);
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static int tx_pointer;
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static int ixpdev_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct ixpdev_priv *ip = netdev_priv(dev);
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struct ixpdev_tx_desc *desc;
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int entry;
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unsigned long flags;
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if (unlikely(skb->len > PAGE_SIZE)) {
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/* @@@ Count drops. */
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dev_kfree_skb(skb);
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return NETDEV_TX_OK;
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}
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entry = tx_pointer;
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tx_pointer = (tx_pointer + 1) % TX_BUF_COUNT;
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desc = tx_desc + entry;
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desc->pkt_length = skb->len;
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desc->channel = ip->channel;
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skb_copy_and_csum_dev(skb, phys_to_virt(desc->buf_addr));
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dev_kfree_skb(skb);
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ixp2000_reg_write(RING_TX_PENDING,
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TX_BUF_DESC_BASE + (entry * sizeof(struct ixpdev_tx_desc)));
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local_irq_save(flags);
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ip->tx_queue_entries++;
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if (ip->tx_queue_entries == TX_BUF_COUNT_PER_CHAN)
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netif_stop_queue(dev);
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local_irq_restore(flags);
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return NETDEV_TX_OK;
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}
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static int ixpdev_rx(struct net_device *dev, int processed, int budget)
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{
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while (processed < budget) {
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struct ixpdev_rx_desc *desc;
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struct sk_buff *skb;
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void *buf;
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u32 _desc;
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_desc = ixp2000_reg_read(RING_RX_DONE);
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if (_desc == 0)
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return 0;
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desc = rx_desc +
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((_desc - RX_BUF_DESC_BASE) / sizeof(struct ixpdev_rx_desc));
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buf = phys_to_virt(desc->buf_addr);
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if (desc->pkt_length < 4 || desc->pkt_length > PAGE_SIZE) {
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printk(KERN_ERR "ixp2000: rx err, length %d\n",
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desc->pkt_length);
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goto err;
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}
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if (desc->channel < 0 || desc->channel >= nds_count) {
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printk(KERN_ERR "ixp2000: rx err, channel %d\n",
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desc->channel);
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goto err;
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}
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/* @@@ Make FCS stripping configurable. */
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desc->pkt_length -= 4;
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if (unlikely(!netif_running(nds[desc->channel])))
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goto err;
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skb = netdev_alloc_skb_ip_align(dev, desc->pkt_length);
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if (likely(skb != NULL)) {
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skb_copy_to_linear_data(skb, buf, desc->pkt_length);
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skb_put(skb, desc->pkt_length);
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skb->protocol = eth_type_trans(skb, nds[desc->channel]);
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netif_receive_skb(skb);
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}
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err:
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ixp2000_reg_write(RING_RX_PENDING, _desc);
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processed++;
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}
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return processed;
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}
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/* dev always points to nds[0]. */
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static int ixpdev_poll(struct napi_struct *napi, int budget)
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{
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struct ixpdev_priv *ip = container_of(napi, struct ixpdev_priv, napi);
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struct net_device *dev = ip->dev;
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int rx;
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rx = 0;
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do {
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ixp2000_reg_write(IXP2000_IRQ_THD_RAW_STATUS_A_0, 0x00ff);
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rx = ixpdev_rx(dev, rx, budget);
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if (rx >= budget)
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break;
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} while (ixp2000_reg_read(IXP2000_IRQ_THD_RAW_STATUS_A_0) & 0x00ff);
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napi_complete(napi);
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ixp2000_reg_write(IXP2000_IRQ_THD_ENABLE_SET_A_0, 0x00ff);
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return rx;
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}
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static void ixpdev_tx_complete(void)
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{
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int channel;
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u32 wake;
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wake = 0;
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while (1) {
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struct ixpdev_priv *ip;
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u32 desc;
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int entry;
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desc = ixp2000_reg_read(RING_TX_DONE);
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if (desc == 0)
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break;
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/* @@@ Check whether entries come back in order. */
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entry = (desc - TX_BUF_DESC_BASE) / sizeof(struct ixpdev_tx_desc);
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channel = tx_desc[entry].channel;
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if (channel < 0 || channel >= nds_count) {
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printk(KERN_ERR "ixp2000: txcomp channel index "
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"out of bounds (%d, %.8i, %d)\n",
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channel, (unsigned int)desc, entry);
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continue;
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}
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ip = netdev_priv(nds[channel]);
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if (ip->tx_queue_entries == TX_BUF_COUNT_PER_CHAN)
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wake |= 1 << channel;
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ip->tx_queue_entries--;
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}
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for (channel = 0; wake != 0; channel++) {
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if (wake & (1 << channel)) {
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netif_wake_queue(nds[channel]);
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wake &= ~(1 << channel);
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}
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}
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}
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static irqreturn_t ixpdev_interrupt(int irq, void *dev_id)
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{
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u32 status;
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status = ixp2000_reg_read(IXP2000_IRQ_THD_STATUS_A_0);
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if (status == 0)
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return IRQ_NONE;
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/*
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* Any of the eight receive units signaled RX?
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*/
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if (status & 0x00ff) {
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struct net_device *dev = nds[0];
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struct ixpdev_priv *ip = netdev_priv(dev);
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ixp2000_reg_wrb(IXP2000_IRQ_THD_ENABLE_CLEAR_A_0, 0x00ff);
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if (likely(napi_schedule_prep(&ip->napi))) {
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__napi_schedule(&ip->napi);
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} else {
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printk(KERN_CRIT "ixp2000: irq while polling!!\n");
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}
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}
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/*
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* Any of the eight transmit units signaled TXdone?
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*/
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if (status & 0xff00) {
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ixp2000_reg_wrb(IXP2000_IRQ_THD_RAW_STATUS_A_0, 0xff00);
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ixpdev_tx_complete();
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}
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return IRQ_HANDLED;
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}
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#ifdef CONFIG_NET_POLL_CONTROLLER
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static void ixpdev_poll_controller(struct net_device *dev)
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{
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disable_irq(IRQ_IXP2000_THDA0);
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ixpdev_interrupt(IRQ_IXP2000_THDA0, dev);
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enable_irq(IRQ_IXP2000_THDA0);
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}
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#endif
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static int ixpdev_open(struct net_device *dev)
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{
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struct ixpdev_priv *ip = netdev_priv(dev);
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int err;
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napi_enable(&ip->napi);
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if (!nds_open++) {
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err = request_irq(IRQ_IXP2000_THDA0, ixpdev_interrupt,
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IRQF_SHARED, "ixp2000_eth", nds);
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if (err) {
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nds_open--;
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napi_disable(&ip->napi);
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return err;
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}
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ixp2000_reg_write(IXP2000_IRQ_THD_ENABLE_SET_A_0, 0xffff);
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}
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set_port_admin_status(ip->channel, 1);
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netif_start_queue(dev);
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return 0;
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}
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static int ixpdev_close(struct net_device *dev)
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{
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struct ixpdev_priv *ip = netdev_priv(dev);
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netif_stop_queue(dev);
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napi_disable(&ip->napi);
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set_port_admin_status(ip->channel, 0);
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if (!--nds_open) {
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ixp2000_reg_write(IXP2000_IRQ_THD_ENABLE_CLEAR_A_0, 0xffff);
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free_irq(IRQ_IXP2000_THDA0, nds);
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}
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return 0;
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}
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static struct net_device_stats *ixpdev_get_stats(struct net_device *dev)
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{
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struct ixpdev_priv *ip = netdev_priv(dev);
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pm3386_get_stats(ip->channel, &(dev->stats));
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return &(dev->stats);
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}
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static const struct net_device_ops ixpdev_netdev_ops = {
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.ndo_open = ixpdev_open,
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.ndo_stop = ixpdev_close,
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.ndo_start_xmit = ixpdev_xmit,
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.ndo_change_mtu = eth_change_mtu,
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.ndo_validate_addr = eth_validate_addr,
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.ndo_set_mac_address = eth_mac_addr,
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.ndo_get_stats = ixpdev_get_stats,
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#ifdef CONFIG_NET_POLL_CONTROLLER
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.ndo_poll_controller = ixpdev_poll_controller,
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#endif
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};
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struct net_device *ixpdev_alloc(int channel, int sizeof_priv)
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{
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struct net_device *dev;
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struct ixpdev_priv *ip;
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dev = alloc_etherdev(sizeof_priv);
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if (dev == NULL)
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return NULL;
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dev->netdev_ops = &ixpdev_netdev_ops;
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dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
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ip = netdev_priv(dev);
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ip->dev = dev;
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netif_napi_add(dev, &ip->napi, ixpdev_poll, 64);
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ip->channel = channel;
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ip->tx_queue_entries = 0;
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return dev;
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}
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int ixpdev_init(int __nds_count, struct net_device **__nds,
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void (*__set_port_admin_status)(int port, int up))
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{
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int i;
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int err;
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BUILD_BUG_ON(RX_BUF_COUNT > 192 || TX_BUF_COUNT > 192);
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printk(KERN_INFO "IXP2000 MSF ethernet driver %s\n", DRV_MODULE_VERSION);
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nds_count = __nds_count;
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nds = __nds;
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set_port_admin_status = __set_port_admin_status;
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for (i = 0; i < RX_BUF_COUNT; i++) {
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void *buf;
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buf = (void *)get_zeroed_page(GFP_KERNEL);
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if (buf == NULL) {
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err = -ENOMEM;
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while (--i >= 0)
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free_page((unsigned long)phys_to_virt(rx_desc[i].buf_addr));
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goto err_out;
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}
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rx_desc[i].buf_addr = virt_to_phys(buf);
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rx_desc[i].buf_length = PAGE_SIZE;
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}
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/* @@@ Maybe we shouldn't be preallocating TX buffers. */
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for (i = 0; i < TX_BUF_COUNT; i++) {
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void *buf;
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buf = (void *)get_zeroed_page(GFP_KERNEL);
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if (buf == NULL) {
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err = -ENOMEM;
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while (--i >= 0)
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free_page((unsigned long)phys_to_virt(tx_desc[i].buf_addr));
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goto err_free_rx;
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}
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tx_desc[i].buf_addr = virt_to_phys(buf);
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}
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/* 256 entries, ring status set means 'empty', base address 0x0000. */
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ixp2000_reg_write(RING_RX_PENDING_BASE, 0x44000000);
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ixp2000_reg_write(RING_RX_PENDING_HEAD, 0x00000000);
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ixp2000_reg_write(RING_RX_PENDING_TAIL, 0x00000000);
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/* 256 entries, ring status set means 'full', base address 0x0400. */
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ixp2000_reg_write(RING_RX_DONE_BASE, 0x40000400);
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ixp2000_reg_write(RING_RX_DONE_HEAD, 0x00000000);
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ixp2000_reg_write(RING_RX_DONE_TAIL, 0x00000000);
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for (i = 0; i < RX_BUF_COUNT; i++) {
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ixp2000_reg_write(RING_RX_PENDING,
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RX_BUF_DESC_BASE + (i * sizeof(struct ixpdev_rx_desc)));
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}
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ixp2000_uengine_load(0, &ixp2400_rx);
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ixp2000_uengine_start_contexts(0, 0xff);
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/* 256 entries, ring status set means 'empty', base address 0x0800. */
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ixp2000_reg_write(RING_TX_PENDING_BASE, 0x44000800);
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ixp2000_reg_write(RING_TX_PENDING_HEAD, 0x00000000);
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ixp2000_reg_write(RING_TX_PENDING_TAIL, 0x00000000);
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/* 256 entries, ring status set means 'full', base address 0x0c00. */
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ixp2000_reg_write(RING_TX_DONE_BASE, 0x40000c00);
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ixp2000_reg_write(RING_TX_DONE_HEAD, 0x00000000);
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ixp2000_reg_write(RING_TX_DONE_TAIL, 0x00000000);
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ixp2000_uengine_load(1, &ixp2400_tx);
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ixp2000_uengine_start_contexts(1, 0xff);
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for (i = 0; i < nds_count; i++) {
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err = register_netdev(nds[i]);
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if (err) {
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while (--i >= 0)
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unregister_netdev(nds[i]);
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goto err_free_tx;
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}
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}
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for (i = 0; i < nds_count; i++) {
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printk(KERN_INFO "%s: IXP2000 MSF ethernet (port %d), "
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"%.2x:%.2x:%.2x:%.2x:%.2x:%.2x.\n", nds[i]->name, i,
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nds[i]->dev_addr[0], nds[i]->dev_addr[1],
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nds[i]->dev_addr[2], nds[i]->dev_addr[3],
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nds[i]->dev_addr[4], nds[i]->dev_addr[5]);
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}
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return 0;
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err_free_tx:
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for (i = 0; i < TX_BUF_COUNT; i++)
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free_page((unsigned long)phys_to_virt(tx_desc[i].buf_addr));
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err_free_rx:
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for (i = 0; i < RX_BUF_COUNT; i++)
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free_page((unsigned long)phys_to_virt(rx_desc[i].buf_addr));
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err_out:
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return err;
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}
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void ixpdev_deinit(void)
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{
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int i;
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/* @@@ Flush out pending packets. */
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for (i = 0; i < nds_count; i++)
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unregister_netdev(nds[i]);
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ixp2000_uengine_stop_contexts(1, 0xff);
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ixp2000_uengine_stop_contexts(0, 0xff);
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ixp2000_uengine_reset(0x3);
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for (i = 0; i < TX_BUF_COUNT; i++)
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free_page((unsigned long)phys_to_virt(tx_desc[i].buf_addr));
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for (i = 0; i < RX_BUF_COUNT; i++)
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free_page((unsigned long)phys_to_virt(rx_desc[i].buf_addr));
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}
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