mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
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637 lines
16 KiB
C
637 lines
16 KiB
C
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/************************************************************************
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*
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* Copyright (c) 2005
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* Infineon Technologies AG
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* St. Martin Strasse 53; 81669 Muenchen; Germany
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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************************************************************************/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/interrupt.h>
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#include <linux/uaccess.h>
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#include <linux/in.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/ip.h>
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#include <linux/tcp.h>
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#include <linux/skbuff.h>
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#include <linux/mm.h>
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#include <linux/platform_device.h>
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#include <linux/ethtool.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/delay.h>
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#include <asm/checksum.h>
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#if 1 /** TODO: MOVE TO APPROPRIATE PLACE */
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#define ETHERNET_PACKET_DMA_BUFFER_SIZE 0x600
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#define REV_MII_MODE 2
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#endif
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#define DRV_NAME "ifxmips_mii0"
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#include <lantiq_soc.h>
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#include <svip_dma.h>
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#ifdef CONFIG_DEBUG_MINI_BOOT
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#define IKOS_MINI_BOOT
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#endif
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/* debugging */
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#undef INCAIP2_SW_DUMP
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#define INCAIP2_SW_EMSG(fmt,args...) printk("%s: " fmt, __FUNCTION__ , ##args)
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#define INCAIP2_SW_CHIP_NO 1
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#define INCAIP2_SW_CHIP_ID 0
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#define INCAIP2_SW_DEVICE_NO 1
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#ifdef INCAIP2_SW_DEBUG_MSG
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#define INCAIP2_SW_DMSG(fmt,args...) printk("%s: " fmt, __FUNCTION__ , ##args)
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#else
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#define INCAIP2_SW_DMSG(fmt,args...)
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#endif
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/************************** Module Parameters *****************************/
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static char *mode = "bridge";
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module_param(mode, charp, 0000);
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MODULE_PARM_DESC(mode, "<description>");
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#ifdef HAVE_TX_TIMEOUT
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static int timeout = 10*HZ;
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module_param(timeout, int, 0);
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MODULE_PARM_DESC(timeout, "Transmission watchdog timeout in seconds>");
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#endif
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#ifdef IKOS_MINI_BOOT
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#ifdef CONFIG_INCAIP2
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extern s32 incaip2_sw_to_mbx(struct sk_buff* skb);
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#endif
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extern s32 svip_sw_to_mbx(struct sk_buff* skb);
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#endif
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struct svip_mii_priv {
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struct net_device_stats stats;
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struct dma_device_info *dma_device;
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struct sk_buff *skb;
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};
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static struct net_device *svip_mii0_dev;
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static unsigned char mac_addr[MAX_ADDR_LEN];
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static unsigned char my_ethaddr[MAX_ADDR_LEN];
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/**
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* Initialize MAC address.
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* This function copies the ethernet address from kernel command line.
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*
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* \param line Pointer to parameter
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* \return 0 OK
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* \ingroup Internal
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*/
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static int __init svip_eth_ethaddr_setup(char *line)
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{
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char *ep;
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int i;
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memset(my_ethaddr, 0, MAX_ADDR_LEN);
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/* there should really be routines to do this stuff */
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for (i = 0; i < 6; i++)
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{
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my_ethaddr[i] = line ? simple_strtoul(line, &ep, 16) : 0;
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if (line)
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line = (*ep) ? ep+1 : ep;
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}
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INCAIP2_SW_DMSG("mac address %2x-%2x-%2x-%2x-%2x-%2x \n"
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,my_ethaddr[0]
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,my_ethaddr[1]
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,my_ethaddr[2]
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,my_ethaddr[3]
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,my_ethaddr[4]
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,my_ethaddr[5]);
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return 0;
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}
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__setup("ethaddr=", svip_eth_ethaddr_setup);
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/**
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* Open RX DMA channels.
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* This function opens all DMA rx channels.
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*
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* \param dma_dev pointer to DMA device information
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* \ingroup Internal
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*/
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static void svip_eth_open_rx_dma(struct dma_device_info *dma_dev)
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{
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int i;
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for(i=0; i<dma_dev->num_rx_chan; i++)
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{
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dma_dev->rx_chan[i]->open(dma_dev->rx_chan[i]);
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}
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}
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/**
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* Open TX DMA channels.
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* This function opens all DMA tx channels.
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*
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* \param dev pointer to net device structure that comprises
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* DMA device information pointed to by it's priv field.
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* \ingroup Internal
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*/
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static void svip_eth_open_tx_dma(struct dma_device_info *dma_dev)
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{
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int i;
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for (i=0; i<dma_dev->num_tx_chan; i++)
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{
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dma_dev->tx_chan[i]->open(dma_dev->tx_chan[i]);
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}
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}
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#ifdef CONFIG_NET_HW_FLOWCONTROL
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/**
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* Enable receiving DMA.
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* This function enables the receiving DMA channel.
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*
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* \param dev pointer to net device structure that comprises
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* DMA device information pointed to by it's priv field.
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* \ingroup Internal
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*/
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void svip_eth_xon(struct net_device *dev)
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{
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struct switch_priv *sw_dev = (struct switch_priv *)dev->priv;
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struct dma_device_info* dma_dev =
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(struct dma_device_info *)sw_dev->dma_device;
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unsigned long flag;
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local_irq_save(flag);
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INCAIP2_SW_DMSG("wakeup\n");
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svip_eth_open_rx_dma(dma_dev);
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local_irq_restore(flag);
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}
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#endif /* CONFIG_NET_HW_FLOWCONTROL */
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/**
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* Open network device.
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* This functions opens the network device and starts the interface queue.
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*
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* \param dev Device structure for Ethernet device
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* \return 0 OK, device opened
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* \return -1 Error, registering DMA device
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* \ingroup API
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*/
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int svip_mii_open(struct net_device *dev)
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{
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struct svip_mii_priv *priv = netdev_priv(dev);
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struct dma_device_info *dma_dev = priv->dma_device;
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svip_eth_open_rx_dma(dma_dev);
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svip_eth_open_tx_dma(dma_dev);
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netif_start_queue(dev);
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return 0;
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}
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/**
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* Close network device.
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* This functions closes the network device, which will also stop the interface
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* queue.
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*
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* \param dev Device structure for Ethernet device
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* \return 0 OK, device closed (cannot fail)
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* \ingroup API
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*/
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int svip_mii_release(struct net_device *dev)
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{
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struct svip_mii_priv *priv = netdev_priv(dev);
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struct dma_device_info *dma_dev = priv->dma_device;
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int i;
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for (i = 0; i < dma_dev->max_rx_chan_num; i++)
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dma_dev->rx_chan[i]->close(dma_dev->rx_chan[i]);
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netif_stop_queue(dev);
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return 0;
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}
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/**
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* Read data from DMA device.
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* This function reads data from the DMA device. The function is called by
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* the switch/DMA pseudo interrupt handler dma_intr_handler on occurence of
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* a DMA receive interrupt.
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*
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* \param dev Pointer to network device structure
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* \param dma_dev Pointer to dma device structure
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* \return OK In case of successful data reception from dma
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* -EIO Incorrect opt pointer provided by device
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* \ingroup Internal
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*/
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int svip_mii_hw_receive(struct net_device *dev, struct dma_device_info *dma_dev)
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{
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struct svip_mii_priv *priv = netdev_priv(dev);
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unsigned char *buf = NULL;
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struct sk_buff *skb = NULL;
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int len = 0;
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len = dma_device_read(dma_dev, &buf, (void **)&skb);
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if (len >= ETHERNET_PACKET_DMA_BUFFER_SIZE) {
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printk(KERN_INFO DRV_NAME ": packet too large %d\n", len);
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goto mii_hw_receive_err_exit;
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}
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if (skb == NULL) {
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printk(KERN_INFO DRV_NAME ": cannot restore pointer\n");
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goto mii_hw_receive_err_exit;
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}
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if (len > (skb->end - skb->tail)) {
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printk(KERN_INFO DRV_NAME ": BUG, len:%d end:%p tail:%p\n",
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len, skb->end, skb->tail);
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goto mii_hw_receive_err_exit;
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}
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skb_put(skb, len);
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skb->dev = dev;
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skb->protocol = eth_type_trans(skb, dev);
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netif_rx(skb);
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priv->stats.rx_packets++;
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priv->stats.rx_bytes += len;
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return 0;
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mii_hw_receive_err_exit:
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if (len == 0) {
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if (skb)
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dev_kfree_skb_any(skb);
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priv->stats.rx_errors++;
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priv->stats.rx_dropped++;
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return -EIO;
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} else {
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return len;
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}
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}
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/**
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* Write data to Ethernet switch.
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* This function writes the data comprised in skb structure via DMA to the
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* Ethernet Switch. It is installed as the switch driver's hard_start_xmit
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* method.
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*
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* \param skb Pointer to socket buffer structure that contains the data
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* to be sent
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* \param dev Pointer to network device structure which is used for
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* data transmission
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* \return 1 Transmission error
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* \return 0 OK, successful data transmission
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* \ingroup API
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*/
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static int svip_mii_hw_tx(char *buf, int len, struct net_device *dev)
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{
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int ret = 0;
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struct svip_mii_priv *priv = netdev_priv(dev);
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struct dma_device_info *dma_dev = priv->dma_device;
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ret = dma_device_write(dma_dev, buf, len, priv->skb);
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return ret;
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}
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static int svip_mii_tx(struct sk_buff *skb, struct net_device *dev)
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{
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int len;
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char *data;
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struct svip_mii_priv *priv = netdev_priv(dev);
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struct dma_device_info *dma_dev = priv->dma_device;
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len = skb->len < ETH_ZLEN ? ETH_ZLEN : skb->len;
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data = skb->data;
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priv->skb = skb;
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dev->trans_start = jiffies;
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/* TODO: we got more than 1 dma channel,
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so we should do something intelligent here to select one */
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dma_dev->current_tx_chan = 0;
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wmb();
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if (svip_mii_hw_tx(data, len, dev) != len) {
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dev_kfree_skb_any(skb);
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priv->stats.tx_errors++;
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priv->stats.tx_dropped++;
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} else {
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priv->stats.tx_packets++;
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priv->stats.tx_bytes += len;
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}
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return 0;
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}
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/**
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* Transmission timeout callback.
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* This functions is called when a trasmission timeout occurs. It will wake up
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* the interface queue again.
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*
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* \param dev Device structure for Ethernet device
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* \ingroup API
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*/
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void svip_mii_tx_timeout(struct net_device *dev)
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{
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int i;
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struct svip_mii_priv *priv = netdev_priv(dev);
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priv->stats.tx_errors++;
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for (i = 0; i < priv->dma_device->max_tx_chan_num; i++)
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priv->dma_device->tx_chan[i]->disable_irq(priv->dma_device->tx_chan[i]);
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netif_wake_queue(dev);
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return;
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}
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/**
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* Get device statistics.
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* This functions returns the device statistics, stored in the device structure.
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*
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* \param dev Device structure for Ethernet device
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* \return stats Pointer to statistics structure
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* \ingroup API
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*/
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static struct net_device_stats *svip_get_stats(struct net_device *dev)
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{
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struct svip_mii_priv *priv = netdev_priv(dev);
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return &priv->stats;
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}
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/**
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* Pseudo Interrupt handler for DMA.
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* This function processes DMA interrupts notified to the switch device driver.
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* The function is installed at the DMA core as interrupt handler for the
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* switch dma device.
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* It handles the following DMA interrupts:
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* passes received data to the upper layer in case of rx interrupt,
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* In case of a dma receive interrupt the received data is passed to the upper layer.
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* In case of a transmit buffer full interrupt the transmit queue is stopped.
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* In case of a transmission complete interrupt the transmit queue is restarted.
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*
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* \param dma_dev pointer to dma device structure
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* \param status type of interrupt being notified (RCV_INT: dma receive
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* interrupt, TX_BUF_FULL_INT: transmit buffer full interrupt,
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* TRANSMIT_CPT_INT: transmission complete interrupt)
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* \return OK In case of successful data reception from dma
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* \ingroup Internal
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*/
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int dma_intr_handler(struct dma_device_info *dma_dev, int status)
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{
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int i;
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switch (status) {
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case RCV_INT:
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svip_mii_hw_receive(svip_mii0_dev, dma_dev);
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break;
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case TX_BUF_FULL_INT:
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printk(KERN_INFO DRV_NAME ": tx buffer full\n");
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netif_stop_queue(svip_mii0_dev);
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for (i = 0; i < dma_dev->max_tx_chan_num; i++) {
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if ((dma_dev->tx_chan[i])->control == LTQ_DMA_CH_ON)
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dma_dev->tx_chan[i]->enable_irq(dma_dev->tx_chan[i]);
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}
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break;
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case TRANSMIT_CPT_INT:
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#if 0
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for (i = 0; i < dma_dev->max_tx_chan_num; i++)
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#if 0
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dma_dev->tx_chan[i]->disable_irq(dma_dev->tx_chan[i]);
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#else
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dma_dev->tx_chan[i]->disable_irq(dma_dev->tx_chan[i], (char *)__FUNCTION__);
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#endif
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netif_wake_queue(svip_mii0_dev);
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#endif
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break;
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}
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return 0;
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}
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/**
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* Allocates buffer sufficient for Ethernet Frame.
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* This function is installed as DMA callback function to be called on DMA
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* receive interrupt.
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*
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* \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");
|