--- /dev/null
+/************************************************************************
+ *
+ * Copyright (c) 2005
+ * Infineon Technologies AG
+ * St. Martin Strasse 53; 81669 Muenchen; Germany
+ *
+ * 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/kernel.h>
+#include <linux/slab.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/interrupt.h>
+#include <linux/uaccess.h>
+#include <linux/in.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/ip.h>
+#include <linux/tcp.h>
+#include <linux/skbuff.h>
+#include <linux/mm.h>
+#include <linux/platform_device.h>
+#include <linux/ethtool.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <asm/checksum.h>
+
+#if 1 /** TODO: MOVE TO APPROPRIATE PLACE */
+
+#define ETHERNET_PACKET_DMA_BUFFER_SIZE 0x600
+#define REV_MII_MODE 2
+
+#endif
+
+#define DRV_NAME "ifxmips_mii0"
+
+#include <lantiq_soc.h>
+#include <svip_dma.h>
+
+#ifdef CONFIG_DEBUG_MINI_BOOT
+#define IKOS_MINI_BOOT
+#endif
+
+/* debugging */
+#undef INCAIP2_SW_DUMP
+
+#define INCAIP2_SW_EMSG(fmt,args...) printk("%s: " fmt, __FUNCTION__ , ##args)
+
+#define INCAIP2_SW_CHIP_NO 1
+#define INCAIP2_SW_CHIP_ID 0
+#define INCAIP2_SW_DEVICE_NO 1
+
+#ifdef INCAIP2_SW_DEBUG_MSG
+#define INCAIP2_SW_DMSG(fmt,args...) printk("%s: " fmt, __FUNCTION__ , ##args)
+#else
+#define INCAIP2_SW_DMSG(fmt,args...)
+#endif
+
+/************************** Module Parameters *****************************/
+static char *mode = "bridge";
+module_param(mode, charp, 0000);
+MODULE_PARM_DESC(mode, "<description>");
+
+#ifdef HAVE_TX_TIMEOUT
+static int timeout = 10*HZ;
+module_param(timeout, int, 0);
+MODULE_PARM_DESC(timeout, "Transmission watchdog timeout in seconds>");
+#endif
+
+#ifdef IKOS_MINI_BOOT
+#ifdef CONFIG_INCAIP2
+extern s32 incaip2_sw_to_mbx(struct sk_buff* skb);
+#endif
+extern s32 svip_sw_to_mbx(struct sk_buff* skb);
+#endif
+
+struct svip_mii_priv {
+ struct net_device_stats stats;
+ struct dma_device_info *dma_device;
+ struct sk_buff *skb;
+};
+
+static struct net_device *svip_mii0_dev;
+static unsigned char mac_addr[MAX_ADDR_LEN];
+static unsigned char my_ethaddr[MAX_ADDR_LEN];
+
+/**
+ * Initialize MAC address.
+ * This function copies the ethernet address from kernel command line.
+ *
+ * \param line Pointer to parameter
+ * \return 0 OK
+ * \ingroup Internal
+ */
+static int __init svip_eth_ethaddr_setup(char *line)
+{
+ char *ep;
+ int i;
+
+ memset(my_ethaddr, 0, MAX_ADDR_LEN);
+ /* there should really be routines to do this stuff */
+ for (i = 0; i < 6; i++)
+ {
+ my_ethaddr[i] = line ? simple_strtoul(line, &ep, 16) : 0;
+ if (line)
+ line = (*ep) ? ep+1 : ep;
+ }
+ INCAIP2_SW_DMSG("mac address %2x-%2x-%2x-%2x-%2x-%2x \n"
+ ,my_ethaddr[0]
+ ,my_ethaddr[1]
+ ,my_ethaddr[2]
+ ,my_ethaddr[3]
+ ,my_ethaddr[4]
+ ,my_ethaddr[5]);
+ return 0;
+}
+__setup("ethaddr=", svip_eth_ethaddr_setup);
+
+
+/**
+ * Open RX DMA channels.
+ * This function opens all DMA rx channels.
+ *
+ * \param dma_dev pointer to DMA device information
+ * \ingroup Internal
+ */
+static void svip_eth_open_rx_dma(struct dma_device_info *dma_dev)
+{
+ int i;
+
+ for(i=0; i<dma_dev->num_rx_chan; i++)
+ {
+ dma_dev->rx_chan[i]->open(dma_dev->rx_chan[i]);
+ }
+}
+
+
+/**
+ * Open TX DMA channels.
+ * This function opens all DMA tx channels.
+ *
+ * \param dev pointer to net device structure that comprises
+ * DMA device information pointed to by it's priv field.
+ * \ingroup Internal
+ */
+static void svip_eth_open_tx_dma(struct dma_device_info *dma_dev)
+{
+ int i;
+
+ for (i=0; i<dma_dev->num_tx_chan; i++)
+ {
+ dma_dev->tx_chan[i]->open(dma_dev->tx_chan[i]);
+ }
+}
+
+
+#ifdef CONFIG_NET_HW_FLOWCONTROL
+/**
+ * Enable receiving DMA.
+ * This function enables the receiving DMA channel.
+ *
+ * \param dev pointer to net device structure that comprises
+ * DMA device information pointed to by it's priv field.
+ * \ingroup Internal
+ */
+void svip_eth_xon(struct net_device *dev)
+{
+ struct switch_priv *sw_dev = (struct switch_priv *)dev->priv;
+ struct dma_device_info* dma_dev =
+ (struct dma_device_info *)sw_dev->dma_device;
+ unsigned long flag;
+
+ local_irq_save(flag);
+
+ INCAIP2_SW_DMSG("wakeup\n");
+ svip_eth_open_rx_dma(dma_dev);
+
+ local_irq_restore(flag);
+}
+#endif /* CONFIG_NET_HW_FLOWCONTROL */
+
+
+/**
+ * Open network device.
+ * This functions opens the network device and starts the interface queue.
+ *
+ * \param dev Device structure for Ethernet device
+ * \return 0 OK, device opened
+ * \return -1 Error, registering DMA device
+ * \ingroup API
+ */
+int svip_mii_open(struct net_device *dev)
+{
+ struct svip_mii_priv *priv = netdev_priv(dev);
+ struct dma_device_info *dma_dev = priv->dma_device;
+
+ svip_eth_open_rx_dma(dma_dev);
+ svip_eth_open_tx_dma(dma_dev);
+
+ netif_start_queue(dev);
+ return 0;
+}
+
+
+/**
+ * Close network device.
+ * This functions closes the network device, which will also stop the interface
+ * queue.
+ *
+ * \param dev Device structure for Ethernet device
+ * \return 0 OK, device closed (cannot fail)
+ * \ingroup API
+ */
+int svip_mii_release(struct net_device *dev)
+{
+ struct svip_mii_priv *priv = netdev_priv(dev);
+ struct dma_device_info *dma_dev = priv->dma_device;
+ int i;
+
+ for (i = 0; i < dma_dev->max_rx_chan_num; i++)
+ dma_dev->rx_chan[i]->close(dma_dev->rx_chan[i]);
+ netif_stop_queue(dev);
+ return 0;
+}
+
+
+/**
+ * Read data from DMA device.
+ * This function reads data from the DMA device. The function is called by
+ * the switch/DMA pseudo interrupt handler dma_intr_handler on occurence of
+ * a DMA receive interrupt.
+ *
+ * \param dev Pointer to network device structure
+ * \param dma_dev Pointer to dma device structure
+ * \return OK In case of successful data reception from dma
+ * -EIO Incorrect opt pointer provided by device
+ * \ingroup Internal
+ */
+int svip_mii_hw_receive(struct net_device *dev, struct dma_device_info *dma_dev)
+{
+ struct svip_mii_priv *priv = netdev_priv(dev);
+ unsigned char *buf = NULL;
+ struct sk_buff *skb = NULL;
+ int len = 0;
+
+ len = dma_device_read(dma_dev, &buf, (void **)&skb);
+
+ if (len >= ETHERNET_PACKET_DMA_BUFFER_SIZE) {
+ printk(KERN_INFO DRV_NAME ": packet too large %d\n", len);
+ goto mii_hw_receive_err_exit;
+ }
+
+ if (skb == NULL) {
+ printk(KERN_INFO DRV_NAME ": cannot restore pointer\n");
+ goto mii_hw_receive_err_exit;
+ }
+
+ if (len > (skb->end - skb->tail)) {
+ printk(KERN_INFO DRV_NAME ": BUG, len:%d end:%p tail:%p\n",
+ len, skb->end, skb->tail);
+ goto mii_hw_receive_err_exit;
+ }
+
+ skb_put(skb, len);
+ skb->dev = dev;
+ skb->protocol = eth_type_trans(skb, dev);
+ netif_rx(skb);
+
+ priv->stats.rx_packets++;
+ priv->stats.rx_bytes += len;
+ return 0;
+
+mii_hw_receive_err_exit:
+ if (len == 0) {
+ if (skb)
+ dev_kfree_skb_any(skb);
+ priv->stats.rx_errors++;
+ priv->stats.rx_dropped++;
+ return -EIO;
+ } else {
+ return len;
+ }
+}
+
+
+/**
+ * Write data to Ethernet switch.
+ * This function writes the data comprised in skb structure via DMA to the
+ * Ethernet Switch. It is installed as the switch driver's hard_start_xmit
+ * method.
+ *
+ * \param skb Pointer to socket buffer structure that contains the data
+ * to be sent
+ * \param dev Pointer to network device structure which is used for
+ * data transmission
+ * \return 1 Transmission error
+ * \return 0 OK, successful data transmission
+ * \ingroup API
+ */
+static int svip_mii_hw_tx(char *buf, int len, struct net_device *dev)
+{
+ int ret = 0;
+ struct svip_mii_priv *priv = netdev_priv(dev);
+ struct dma_device_info *dma_dev = priv->dma_device;
+ ret = dma_device_write(dma_dev, buf, len, priv->skb);
+ return ret;
+}
+
+static int svip_mii_tx(struct sk_buff *skb, struct net_device *dev)
+{
+ int len;
+ char *data;
+ struct svip_mii_priv *priv = netdev_priv(dev);
+ struct dma_device_info *dma_dev = priv->dma_device;
+
+ len = skb->len < ETH_ZLEN ? ETH_ZLEN : skb->len;
+ data = skb->data;
+ priv->skb = skb;
+ dev->trans_start = jiffies;
+ /* TODO: we got more than 1 dma channel,
+ so we should do something intelligent here to select one */
+ dma_dev->current_tx_chan = 0;
+
+ wmb();
+
+ if (svip_mii_hw_tx(data, len, dev) != len) {
+ dev_kfree_skb_any(skb);
+ priv->stats.tx_errors++;
+ priv->stats.tx_dropped++;
+ } else {
+ priv->stats.tx_packets++;
+ priv->stats.tx_bytes += len;
+ }
+
+ return 0;
+}
+
+
+/**
+ * Transmission timeout callback.
+ * This functions is called when a trasmission timeout occurs. It will wake up
+ * the interface queue again.
+ *
+ * \param dev Device structure for Ethernet device
+ * \ingroup API
+ */
+void svip_mii_tx_timeout(struct net_device *dev)
+{
+ int i;
+ struct svip_mii_priv *priv = netdev_priv(dev);
+
+ priv->stats.tx_errors++;
+ for (i = 0; i < priv->dma_device->max_tx_chan_num; i++)
+ priv->dma_device->tx_chan[i]->disable_irq(priv->dma_device->tx_chan[i]);
+ netif_wake_queue(dev);
+ return;
+}
+
+
+/**
+ * Get device statistics.
+ * This functions returns the device statistics, stored in the device structure.
+ *
+ * \param dev Device structure for Ethernet device
+ * \return stats Pointer to statistics structure
+ * \ingroup API
+ */
+static struct net_device_stats *svip_get_stats(struct net_device *dev)
+{
+ struct svip_mii_priv *priv = netdev_priv(dev);
+ return &priv->stats;
+}
+
+
+/**
+ * Pseudo Interrupt handler for DMA.
+ * This function processes DMA interrupts notified to the switch device driver.
+ * The function is installed at the DMA core as interrupt handler for the
+ * switch dma device.
+ * It handles the following DMA interrupts:
+ * passes received data to the upper layer in case of rx interrupt,
+ * In case of a dma receive interrupt the received data is passed to the upper layer.
+ * In case of a transmit buffer full interrupt the transmit queue is stopped.
+ * In case of a transmission complete interrupt the transmit queue is restarted.
+ *
+ * \param dma_dev pointer to dma device structure
+ * \param status type of interrupt being notified (RCV_INT: dma receive
+ * interrupt, TX_BUF_FULL_INT: transmit buffer full interrupt,
+ * TRANSMIT_CPT_INT: transmission complete interrupt)
+ * \return OK In case of successful data reception from dma
+ * \ingroup Internal
+ */
+int dma_intr_handler(struct dma_device_info *dma_dev, int status)
+{
+ int i;
+
+ switch (status) {
+ case RCV_INT:
+ svip_mii_hw_receive(svip_mii0_dev, dma_dev);
+ break;
+
+ case TX_BUF_FULL_INT:
+ printk(KERN_INFO DRV_NAME ": tx buffer full\n");
+ netif_stop_queue(svip_mii0_dev);
+ for (i = 0; i < dma_dev->max_tx_chan_num; i++) {
+ if ((dma_dev->tx_chan[i])->control == LTQ_DMA_CH_ON)
+ dma_dev->tx_chan[i]->enable_irq(dma_dev->tx_chan[i]);
+ }
+ break;
+
+ case TRANSMIT_CPT_INT:
+
+#if 0
+ for (i = 0; i < dma_dev->max_tx_chan_num; i++)
+#if 0
+ dma_dev->tx_chan[i]->disable_irq(dma_dev->tx_chan[i]);
+#else
+ dma_dev->tx_chan[i]->disable_irq(dma_dev->tx_chan[i], (char *)__FUNCTION__);
+#endif
+ netif_wake_queue(svip_mii0_dev);
+#endif
+ break;
+ }
+
+ return 0;
+}
+
+
+/**
+ * Allocates buffer sufficient for Ethernet Frame.
+ * This function is installed as DMA callback function to be called on DMA
+ * receive interrupt.
+ *
+ * \param len Unused
+ * \param *byte_offset Pointer to byte offset
+ * \param **opt pointer to skb structure
+ * \return NULL In case of buffer allocation fails
+ * buffer Pointer to allocated memory
+ * \ingroup Internal
+ */
+unsigned char *svip_etop_dma_buffer_alloc(int len, int *byte_offset, void **opt)
+{
+ unsigned char *buffer = NULL;
+ struct sk_buff *skb = NULL;
+
+ skb = dev_alloc_skb(ETHERNET_PACKET_DMA_BUFFER_SIZE);
+ if (skb == NULL)
+ return NULL;
+
+ buffer = (unsigned char *)(skb->data);
+ skb_reserve(skb, 2);
+ *(int *)opt = (int)skb;
+ *byte_offset = 2;
+
+ return buffer;
+}
+
+
+/**
+ * Free DMA buffer.
+ * This function frees a buffer, which can be either a data buffer or an
+ * skb structure.
+ *
+ * \param *dataptr Pointer to data buffer
+ * \param *opt Pointer to skb structure
+ * \return 0 OK
+ * \ingroup Internal
+ */
+void svip_etop_dma_buffer_free(unsigned char *dataptr, void *opt)
+{
+ struct sk_buff *skb = NULL;
+
+ if (opt == NULL) {
+ kfree(dataptr);
+ } else {
+ skb = (struct sk_buff *)opt;
+ dev_kfree_skb_any(skb);
+ }
+}
+
+static int svip_mii_dev_init(struct net_device *dev);
+
+static const struct net_device_ops svip_eth_netdev_ops = {
+ .ndo_init = svip_mii_dev_init,
+ .ndo_open = svip_mii_open,
+ .ndo_stop = svip_mii_release,
+ .ndo_start_xmit = svip_mii_tx,
+ .ndo_get_stats = svip_get_stats,
+ .ndo_tx_timeout = svip_mii_tx_timeout,
+};
+
+//#include <linux/device.h>
+
+/**
+ * Initialize switch driver.
+ * This functions initializes the switch driver structures and registers the
+ * Ethernet device.
+ *
+ * \param dev Device structure for Ethernet device
+ * \return 0 OK
+ * \return ENOMEM No memory for structures available
+ * \return -1 Error during DMA init or Ethernet address configuration.
+ * \ingroup API
+ */
+static int svip_mii_dev_init(struct net_device *dev)
+{
+ int i;
+ struct svip_mii_priv *priv = netdev_priv(dev);
+
+
+ ether_setup(dev);
+ printk(KERN_INFO DRV_NAME ": %s is up\n", dev->name);
+ dev->watchdog_timeo = 10 * HZ;
+ memset(priv, 0, sizeof(*priv));
+ priv->dma_device = dma_device_reserve("SW");
+ if (!priv->dma_device) {
+ BUG();
+ return -ENODEV;
+ }
+ priv->dma_device->buffer_alloc = svip_etop_dma_buffer_alloc;
+ priv->dma_device->buffer_free = svip_etop_dma_buffer_free;
+ priv->dma_device->intr_handler = dma_intr_handler;
+
+ for (i = 0; i < priv->dma_device->max_rx_chan_num; i++)
+ priv->dma_device->rx_chan[i]->packet_size =
+ ETHERNET_PACKET_DMA_BUFFER_SIZE;
+
+ for (i = 0; i < priv->dma_device->max_tx_chan_num; i++) {
+ priv->dma_device->tx_chan[i]->tx_weight=DEFAULT_SW_CHANNEL_WEIGHT;
+ priv->dma_device->tx_chan[i]->packet_size =
+ ETHERNET_PACKET_DMA_BUFFER_SIZE;
+ }
+
+ dma_device_register(priv->dma_device);
+
+ printk(KERN_INFO DRV_NAME ": using mac=");
+
+ for (i = 0; i < 6; i++) {
+ dev->dev_addr[i] = mac_addr[i];
+ printk("%02X%c", dev->dev_addr[i], (i == 5) ? ('\n') : (':'));
+ }
+
+ return 0;
+}
+
+static void svip_mii_chip_init(int mode)
+{
+}
+
+static int svip_mii_probe(struct platform_device *dev)
+{
+ int result = 0;
+ unsigned char *mac = (unsigned char *)dev->dev.platform_data;
+ svip_mii0_dev = alloc_etherdev(sizeof(struct svip_mii_priv));
+ svip_mii0_dev->netdev_ops = &svip_eth_netdev_ops;
+ memcpy(mac_addr, mac, 6);
+ strcpy(svip_mii0_dev->name, "eth%d");
+ svip_mii_chip_init(REV_MII_MODE);
+ result = register_netdev(svip_mii0_dev);
+ if (result) {
+ printk(KERN_INFO DRV_NAME
+ ": error %i registering device \"%s\"\n",
+ result, svip_mii0_dev->name);
+ goto out;
+ }
+ printk(KERN_INFO DRV_NAME ": driver loaded!\n");
+
+out:
+ return result;
+}
+
+static int svip_mii_remove(struct platform_device *dev)
+{
+ struct svip_mii_priv *priv = netdev_priv(svip_mii0_dev);
+
+ printk(KERN_INFO DRV_NAME ": cleanup\n");
+
+ dma_device_unregister(priv->dma_device);
+ dma_device_release(priv->dma_device);
+ kfree(priv->dma_device);
+ unregister_netdev(svip_mii0_dev);
+ free_netdev(svip_mii0_dev);
+ return 0;
+}
+
+
+static struct platform_driver svip_mii_driver = {
+ .probe = svip_mii_probe,
+ .remove = svip_mii_remove,
+ .driver = {
+ .name = DRV_NAME,
+ .owner = THIS_MODULE,
+ },
+};
+
+
+/**
+ * Initialize switch driver as module.
+ * This functions initializes the switch driver structures and registers the
+ * Ethernet device for module usage.
+ *
+ * \return 0 OK
+ * \return ENODEV An error occured during initialization
+ * \ingroup API
+ */
+int __init svip_mii_init(void)
+{
+ int ret = platform_driver_register(&svip_mii_driver);
+ if (ret)
+ printk(KERN_INFO DRV_NAME
+ ": Error registering platfom driver!\n");
+ return ret;
+}
+
+
+/**
+ * Remove driver module.
+ * This functions removes the driver and unregisters all devices.
+ *
+ * \ingroup API
+ */
+static void __exit svip_mii_cleanup(void)
+{
+ platform_driver_unregister(&svip_mii_driver);
+}
+
+module_init(svip_mii_init);
+module_exit(svip_mii_cleanup);
+
+MODULE_LICENSE("GPL");
projects / openwrt.git / blobdiff