/* * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. */ #define DEBUG #include <linux/init.h> #include <linux/io.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/netdevice.h> #include <linux/etherdevice.h> #include <linux/platform_device.h> #include <asm/mips-boards/simint.h> #include "mipsnet.h" /* actual device IO mapping */ #define MIPSNET_VERSION "2005-06-20" #define mipsnet_reg_address(dev, field) (dev->base_addr + field_offset(field)) static char mipsnet_string[] = "mipsnet"; /* * Copy data from the MIPSNET rx data port */ static int ioiocpy_frommipsnet(struct net_device *dev, unsigned char *kdata, int len) { uint32_t available_len = inl(mipsnet_reg_address(dev, rxDataCount)); if (available_len < len) return -EFAULT; for (; len > 0; len--, kdata++) *kdata = inb(mipsnet_reg_address(dev, rxDataBuffer)); return inl(mipsnet_reg_address(dev, rxDataCount)); } static inline ssize_t mipsnet_put_todevice(struct net_device *dev, struct sk_buff *skb) { int count_to_go = skb->len; char *buf_ptr = skb->data; outl(skb->len, mipsnet_reg_address(dev, txDataCount)); for (; count_to_go; buf_ptr++, count_to_go--) outb(*buf_ptr, mipsnet_reg_address(dev, txDataBuffer)); dev->stats.tx_packets++; dev->stats.tx_bytes += skb->len; return skb->len; } static int mipsnet_xmit(struct sk_buff *skb, struct net_device *dev) { /* * Only one packet at a time. Once TXDONE interrupt is serviced, the * queue will be restarted. */ netif_stop_queue(dev); mipsnet_put_todevice(dev, skb); return 0; } static inline ssize_t mipsnet_get_fromdev(struct net_device *dev, size_t count) { struct sk_buff *skb; size_t len = count; skb = alloc_skb(len + 2, GFP_KERNEL); if (!skb) { dev->stats.rx_dropped++; return -ENOMEM; } skb_reserve(skb, 2); if (ioiocpy_frommipsnet(dev, skb_put(skb, len), len)) return -EFAULT; skb->protocol = eth_type_trans(skb, dev); skb->ip_summed = CHECKSUM_UNNECESSARY; netif_rx(skb); dev->stats.rx_packets++; dev->stats.rx_bytes += len; return count; } static irqreturn_t mipsnet_interrupt(int irq, void *dev_id) { struct net_device *dev = dev_id; irqreturn_t retval = IRQ_NONE; uint64_t interruptFlags; if (irq == dev->irq) { retval = IRQ_HANDLED; interruptFlags = inl(mipsnet_reg_address(dev, interruptControl)); if (interruptFlags & MIPSNET_INTCTL_TXDONE) { outl(MIPSNET_INTCTL_TXDONE, mipsnet_reg_address(dev, interruptControl)); /* only one packet at a time, we are done. */ netif_wake_queue(dev); } else if (interruptFlags & MIPSNET_INTCTL_RXDONE) { mipsnet_get_fromdev(dev, inl(mipsnet_reg_address(dev, rxDataCount))); outl(MIPSNET_INTCTL_RXDONE, mipsnet_reg_address(dev, interruptControl)); } else if (interruptFlags & MIPSNET_INTCTL_TESTBIT) { /* * TESTBIT is cleared on read. * And takes effect after a write with 0 */ outl(0, mipsnet_reg_address(dev, interruptControl)); } else { /* Maybe shared IRQ, just ignore, no clearing. */ retval = IRQ_NONE; } } else { printk(KERN_INFO "%s: %s(): irq %d for unknown device\n", dev->name, __FUNCTION__, irq); retval = IRQ_NONE; } return retval; } static int mipsnet_open(struct net_device *dev) { int err; err = request_irq(dev->irq, &mipsnet_interrupt, IRQF_SHARED, dev->name, (void *) dev); if (err) { release_region(dev->base_addr, MIPSNET_IO_EXTENT); return err; } netif_start_queue(dev); /* test interrupt handler */ outl(MIPSNET_INTCTL_TESTBIT, mipsnet_reg_address(dev, interruptControl)); return 0; } static int mipsnet_close(struct net_device *dev) { netif_stop_queue(dev); return 0; } static void mipsnet_set_mclist(struct net_device *dev) { } static int __init mipsnet_probe(struct device *dev) { struct net_device *netdev; int err; netdev = alloc_etherdev(0); if (!netdev) { err = -ENOMEM; goto out; } dev_set_drvdata(dev, netdev); netdev->open = mipsnet_open; netdev->stop = mipsnet_close; netdev->hard_start_xmit = mipsnet_xmit; netdev->set_multicast_list = mipsnet_set_mclist; /* * TODO: probe for these or load them from PARAM */ netdev->base_addr = 0x4200; netdev->irq = MIPS_CPU_IRQ_BASE + MIPSCPU_INT_MB0 + inl(mipsnet_reg_address(netdev, interruptInfo)); /* Get the io region now, get irq on open() */ if (!request_region(netdev->base_addr, MIPSNET_IO_EXTENT, "mipsnet")) { err = -EBUSY; goto out_free_netdev; } /* * Lacking any better mechanism to allocate a MAC address we use a * random one ... */ random_ether_addr(netdev->dev_addr); err = register_netdev(netdev); if (err) { printk(KERN_ERR "MIPSNet: failed to register netdev.\n"); goto out_free_region; } return 0; out_free_region: release_region(netdev->base_addr, MIPSNET_IO_EXTENT); out_free_netdev: free_netdev(netdev); out: return err; } static int __devexit mipsnet_device_remove(struct device *device) { struct net_device *dev = dev_get_drvdata(device); unregister_netdev(dev); release_region(dev->base_addr, MIPSNET_IO_EXTENT); free_netdev(dev); dev_set_drvdata(device, NULL); return 0; } static struct device_driver mipsnet_driver = { .name = mipsnet_string, .bus = &platform_bus_type, .probe = mipsnet_probe, .remove = __devexit_p(mipsnet_device_remove), }; static int __init mipsnet_init_module(void) { int err; printk(KERN_INFO "MIPSNet Ethernet driver. Version: %s. " "(c)2005 MIPS Technologies, Inc.\n", MIPSNET_VERSION); err = driver_register(&mipsnet_driver); if (err) printk(KERN_ERR "Driver registration failed\n"); return err; } static void __exit mipsnet_exit_module(void) { driver_unregister(&mipsnet_driver); } module_init(mipsnet_init_module); module_exit(mipsnet_exit_module);