1 files changed, 404 insertions, 0 deletions

diff --git a/drivers/net/ixp2000/ixpdev.c b/drivers/net/ixp2000/ixpdev.c
new file mode 100644
index 000000000000..216aad1911e6
--- /dev/null
+++ b/drivers/net/ixp2000/ixpdev.c
@@ -0,0 +1,404 @@
+/*
+ * 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/config.h>
+#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/arch/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"
+
+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 *budget)
+{
+        while (*budget > 0) {
+                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->dev = nds[desc->channel];
+                        skb_reserve(skb, 2);
+                        eth_copy_and_sum(skb, buf, desc->pkt_length, 0);
+                        skb_put(skb, desc->pkt_length);
+                        skb->protocol = eth_type_trans(skb, skb->dev);
+
+                        skb->dev->last_rx = jiffies;
+
+                        netif_receive_skb(skb);
+                }
+
+err:
+                ixp2000_reg_write(RING_RX_PENDING, _desc);
+                dev->quota--;
+                (*budget)--;
+        }
+
+        return 1;
+}
+
+/* dev always points to nds[0].  */
+static int ixpdev_poll(struct net_device *dev, int *budget)
+{
+        /* @@@ Have to stop polling when nds[0] is administratively
+         * downed while we are polling.  */
+        do {
+                ixp2000_reg_write(IXP2000_IRQ_THD_RAW_STATUS_A_0, 0x00ff);
+
+                if (ixpdev_rx(dev, budget))
+                        return 1;
+        } while (ixp2000_reg_read(IXP2000_IRQ_THD_RAW_STATUS_A_0) & 0x00ff);
+
+        netif_rx_complete(dev);
+        ixp2000_reg_write(IXP2000_IRQ_THD_ENABLE_SET_A_0, 0x00ff);
+
+        return 0;
+}
+
+/* @@@ Ugly hack.  */
+static inline int netif_rx_schedule_prep_notup(struct net_device *dev)
+{
+        return !test_and_set_bit(__LINK_STATE_RX_SCHED, &dev->state);
+}
+
+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, struct pt_regs *regs)
+{
+        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) {
+                ixp2000_reg_wrb(IXP2000_IRQ_THD_ENABLE_CLEAR_A_0, 0x00ff);
+                if (likely(netif_rx_schedule_prep_notup(nds[0]))) {
+                        __netif_rx_schedule(nds[0]);
+                } 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;
+}
+
+static int ixpdev_open(struct net_device *dev)
+{
+        struct ixpdev_priv *ip = netdev_priv(dev);
+        int err;
+
+        if (!nds_open++) {
+                err = request_irq(IRQ_IXP2000_THDA0, ixpdev_interrupt,
+                                        SA_SHIRQ, "ixp2000_eth", nds);
+                if (err) {
+                        nds_open--;
+                        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);
+        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->poll = ixpdev_poll;
+        dev->open = ixpdev_open;
+        dev->stop = ixpdev_close;
+
+        dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
+        dev->weight = 64;
+
+        ip = netdev_priv(dev);
+        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;
+
+        if (RX_BUF_COUNT > 192 || TX_BUF_COUNT > 192) {
+                static void __too_many_rx_or_tx_buffers(void);
+                __too_many_rx_or_tx_buffers();
+        }
+
+        nds_count = __nds_count;
+        nds = __nds;
+        set_port_admin_status = __set_port_admin_status;
+
+        for (i = 0; i < nds_count; i++) {
+                err = register_netdev(nds[i]);
+                if (err) {
+                        while (--i >= 0)
+                                unregister_netdev(nds[i]);
+                        goto err_out;
+                }
+        }
+
+        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_unregister;
+                }
+                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);
+
+        return 0;
+
+err_free_rx:
+        for (i = 0; i < RX_BUF_COUNT; i++)
+                free_page((unsigned long)phys_to_virt(rx_desc[i].buf_addr));
+
+err_unregister:
+        for (i = 0; i < nds_count; i++)
+                unregister_netdev(nds[i]);
+
+err_out:
+        return err;
+} 
+
+void ixpdev_deinit(void)
+{
+        int i;
+
+        /* @@@ Flush out pending packets.  */
+
+        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));
+
+        for (i = 0; i < nds_count; i++)
+                unregister_netdev(nds[i]);
+}