2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
9 #include <linux/init.h>
11 #include <linux/kernel.h>
12 #include <linux/module.h>
13 #include <linux/netdevice.h>
14 #include <linux/etherdevice.h>
15 #include <linux/platform_device.h>
16 #include <asm/mips-boards/simint.h>
18 #include "mipsnet.h" /* actual device IO mapping */
20 #define MIPSNET_VERSION "2005-06-20"
22 #define mipsnet_reg_address(dev, field) (dev->base_addr + field_offset(field))
24 static char mipsnet_string[] = "mipsnet";
27 * Copy data from the MIPSNET rx data port
29 static int ioiocpy_frommipsnet(struct net_device *dev, unsigned char *kdata,
32 uint32_t available_len = inl(mipsnet_reg_address(dev, rxDataCount));
34 if (available_len < len)
37 for (; len > 0; len--, kdata++)
38 *kdata = inb(mipsnet_reg_address(dev, rxDataBuffer));
40 return inl(mipsnet_reg_address(dev, rxDataCount));
43 static inline ssize_t mipsnet_put_todevice(struct net_device *dev,
46 int count_to_go = skb->len;
47 char *buf_ptr = skb->data;
49 outl(skb->len, mipsnet_reg_address(dev, txDataCount));
51 for (; count_to_go; buf_ptr++, count_to_go--)
52 outb(*buf_ptr, mipsnet_reg_address(dev, txDataBuffer));
54 dev->stats.tx_packets++;
55 dev->stats.tx_bytes += skb->len;
60 static int mipsnet_xmit(struct sk_buff *skb, struct net_device *dev)
63 * Only one packet at a time. Once TXDONE interrupt is serviced, the
64 * queue will be restarted.
66 netif_stop_queue(dev);
67 mipsnet_put_todevice(dev, skb);
72 static inline ssize_t mipsnet_get_fromdev(struct net_device *dev, size_t count)
77 skb = alloc_skb(len + 2, GFP_KERNEL);
79 dev->stats.rx_dropped++;
84 if (ioiocpy_frommipsnet(dev, skb_put(skb, len), len))
87 skb->protocol = eth_type_trans(skb, dev);
88 skb->ip_summed = CHECKSUM_UNNECESSARY;
92 dev->stats.rx_packets++;
93 dev->stats.rx_bytes += len;
98 static irqreturn_t mipsnet_interrupt(int irq, void *dev_id)
100 struct net_device *dev = dev_id;
102 irqreturn_t retval = IRQ_NONE;
103 uint64_t interruptFlags;
105 if (irq == dev->irq) {
106 retval = IRQ_HANDLED;
109 inl(mipsnet_reg_address(dev, interruptControl));
111 if (interruptFlags & MIPSNET_INTCTL_TXDONE) {
112 outl(MIPSNET_INTCTL_TXDONE,
113 mipsnet_reg_address(dev, interruptControl));
114 /* only one packet at a time, we are done. */
115 netif_wake_queue(dev);
116 } else if (interruptFlags & MIPSNET_INTCTL_RXDONE) {
117 mipsnet_get_fromdev(dev,
118 inl(mipsnet_reg_address(dev, rxDataCount)));
119 outl(MIPSNET_INTCTL_RXDONE,
120 mipsnet_reg_address(dev, interruptControl));
122 } else if (interruptFlags & MIPSNET_INTCTL_TESTBIT) {
124 * TESTBIT is cleared on read.
125 * And takes effect after a write with 0
127 outl(0, mipsnet_reg_address(dev, interruptControl));
129 /* Maybe shared IRQ, just ignore, no clearing. */
134 printk(KERN_INFO "%s: %s(): irq %d for unknown device\n",
135 dev->name, __FUNCTION__, irq);
141 static int mipsnet_open(struct net_device *dev)
145 err = request_irq(dev->irq, &mipsnet_interrupt,
146 IRQF_SHARED, dev->name, (void *) dev);
149 release_region(dev->base_addr, MIPSNET_IO_EXTENT);
153 netif_start_queue(dev);
155 /* test interrupt handler */
156 outl(MIPSNET_INTCTL_TESTBIT,
157 mipsnet_reg_address(dev, interruptControl));
163 static int mipsnet_close(struct net_device *dev)
165 netif_stop_queue(dev);
170 static void mipsnet_set_mclist(struct net_device *dev)
174 static int __init mipsnet_probe(struct device *dev)
176 struct net_device *netdev;
179 netdev = alloc_etherdev(0);
185 dev_set_drvdata(dev, netdev);
187 netdev->open = mipsnet_open;
188 netdev->stop = mipsnet_close;
189 netdev->hard_start_xmit = mipsnet_xmit;
190 netdev->set_multicast_list = mipsnet_set_mclist;
193 * TODO: probe for these or load them from PARAM
195 netdev->base_addr = 0x4200;
196 netdev->irq = MIPS_CPU_IRQ_BASE + MIPSCPU_INT_MB0 +
197 inl(mipsnet_reg_address(netdev, interruptInfo));
199 /* Get the io region now, get irq on open() */
200 if (!request_region(netdev->base_addr, MIPSNET_IO_EXTENT, "mipsnet")) {
202 goto out_free_netdev;
206 * Lacking any better mechanism to allocate a MAC address we use a
209 random_ether_addr(netdev->dev_addr);
211 err = register_netdev(netdev);
213 printk(KERN_ERR "MIPSNet: failed to register netdev.\n");
214 goto out_free_region;
220 release_region(netdev->base_addr, MIPSNET_IO_EXTENT);
229 static int __devexit mipsnet_device_remove(struct device *device)
231 struct net_device *dev = dev_get_drvdata(device);
233 unregister_netdev(dev);
234 release_region(dev->base_addr, MIPSNET_IO_EXTENT);
236 dev_set_drvdata(device, NULL);
241 static struct device_driver mipsnet_driver = {
242 .name = mipsnet_string,
243 .bus = &platform_bus_type,
244 .probe = mipsnet_probe,
245 .remove = __devexit_p(mipsnet_device_remove),
248 static int __init mipsnet_init_module(void)
252 printk(KERN_INFO "MIPSNet Ethernet driver. Version: %s. "
253 "(c)2005 MIPS Technologies, Inc.\n", MIPSNET_VERSION);
255 err = driver_register(&mipsnet_driver);
257 printk(KERN_ERR "Driver registration failed\n");
262 static void __exit mipsnet_exit_module(void)
264 driver_unregister(&mipsnet_driver);
267 module_init(mipsnet_init_module);
268 module_exit(mipsnet_exit_module);