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Ralf Baechledcbf8472005-10-10 14:51:27 +01001/*
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
4 * for more details.
5 */
6
Ralf Baechledcbf8472005-10-10 14:51:27 +01007#include <linux/init.h>
Ralf Baechlec2af68e2007-10-12 14:59:56 +01008#include <linux/io.h>
Ralf Baechledcbf8472005-10-10 14:51:27 +01009#include <linux/kernel.h>
10#include <linux/module.h>
11#include <linux/netdevice.h>
Ralf Baechledcbf8472005-10-10 14:51:27 +010012#include <linux/etherdevice.h>
Russell Kingd052d1b2005-10-29 19:07:23 +010013#include <linux/platform_device.h>
Ralf Baechledcbf8472005-10-10 14:51:27 +010014#include <asm/mips-boards/simint.h>
15
Ralf Baechlec800c5c2008-01-11 17:28:00 +000016#define MIPSNET_VERSION "2007-11-17"
Ralf Baechledcbf8472005-10-10 14:51:27 +010017
Ralf Baechlec800c5c2008-01-11 17:28:00 +000018/*
19 * Net status/control block as seen by sw in the core.
20 */
21struct mipsnet_regs {
22 /*
23 * Device info for probing, reads as MIPSNET%d where %d is some
24 * form of version.
25 */
26 u64 devId; /*0x00 */
Ralf Baechledcbf8472005-10-10 14:51:27 +010027
Ralf Baechlec800c5c2008-01-11 17:28:00 +000028 /*
29 * read only busy flag.
30 * Set and cleared by the Net Device to indicate that an rx or a tx
31 * is in progress.
32 */
33 u32 busy; /*0x08 */
34
35 /*
36 * Set by the Net Device.
37 * The device will set it once data has been received.
38 * The value is the number of bytes that should be read from
39 * rxDataBuffer. The value will decrease till 0 until all the data
40 * from rxDataBuffer has been read.
41 */
42 u32 rxDataCount; /*0x0c */
43#define MIPSNET_MAX_RXTX_DATACOUNT (1 << 16)
44
45 /*
46 * Settable from the MIPS core, cleared by the Net Device.
47 * The core should set the number of bytes it wants to send,
48 * then it should write those bytes of data to txDataBuffer.
49 * The device will clear txDataCount has been processed (not
50 * necessarily sent).
51 */
52 u32 txDataCount; /*0x10 */
53
54 /*
55 * Interrupt control
56 *
57 * Used to clear the interrupted generated by this dev.
58 * Write a 1 to clear the interrupt. (except bit31).
59 *
60 * Bit0 is set if it was a tx-done interrupt.
61 * Bit1 is set when new rx-data is available.
62 * Until this bit is cleared there will be no other RXs.
63 *
64 * Bit31 is used for testing, it clears after a read.
65 * Writing 1 to this bit will cause an interrupt to be generated.
66 * To clear the test interrupt, write 0 to this register.
67 */
68 u32 interruptControl; /*0x14 */
69#define MIPSNET_INTCTL_TXDONE (1u << 0)
70#define MIPSNET_INTCTL_RXDONE (1u << 1)
71#define MIPSNET_INTCTL_TESTBIT (1u << 31)
72
73 /*
74 * Readonly core-specific interrupt info for the device to signal
75 * the core. The meaning of the contents of this field might change.
76 */
77 /* XXX: the whole memIntf interrupt scheme is messy: the device
78 * should have no control what so ever of what VPE/register set is
79 * being used.
80 * The MemIntf should only expose interrupt lines, and something in
81 * the config should be responsible for the line<->core/vpe bindings.
82 */
83 u32 interruptInfo; /*0x18 */
84
85 /*
86 * This is where the received data is read out.
87 * There is more data to read until rxDataReady is 0.
88 * Only 1 byte at this regs offset is used.
89 */
90 u32 rxDataBuffer; /*0x1c */
91
92 /*
93 * This is where the data to transmit is written.
94 * Data should be written for the amount specified in the
95 * txDataCount register.
96 * Only 1 byte at this regs offset is used.
97 */
98 u32 txDataBuffer; /*0x20 */
99};
100
101#define regaddr(dev, field) \
102 (dev->base_addr + offsetof(struct mipsnet_regs, field))
Ralf Baechledcbf8472005-10-10 14:51:27 +0100103
Ralf Baechledcbf8472005-10-10 14:51:27 +0100104static char mipsnet_string[] = "mipsnet";
105
106/*
107 * Copy data from the MIPSNET rx data port
108 */
109static int ioiocpy_frommipsnet(struct net_device *dev, unsigned char *kdata,
110 int len)
111{
Ralf Baechlec2af68e2007-10-12 14:59:56 +0100112 for (; len > 0; len--, kdata++)
Ralf Baechlec800c5c2008-01-11 17:28:00 +0000113 *kdata = inb(regaddr(dev, rxDataBuffer));
Ralf Baechledcbf8472005-10-10 14:51:27 +0100114
Ralf Baechlec800c5c2008-01-11 17:28:00 +0000115 return inl(regaddr(dev, rxDataCount));
Ralf Baechledcbf8472005-10-10 14:51:27 +0100116}
117
Ralf Baechlec800c5c2008-01-11 17:28:00 +0000118static inline void mipsnet_put_todevice(struct net_device *dev,
Ralf Baechledcbf8472005-10-10 14:51:27 +0100119 struct sk_buff *skb)
120{
121 int count_to_go = skb->len;
122 char *buf_ptr = skb->data;
Ralf Baechledcbf8472005-10-10 14:51:27 +0100123
Ralf Baechlec800c5c2008-01-11 17:28:00 +0000124 outl(skb->len, regaddr(dev, txDataCount));
Ralf Baechledcbf8472005-10-10 14:51:27 +0100125
Ralf Baechlec2af68e2007-10-12 14:59:56 +0100126 for (; count_to_go; buf_ptr++, count_to_go--)
Ralf Baechlec800c5c2008-01-11 17:28:00 +0000127 outb(*buf_ptr, regaddr(dev, txDataBuffer));
Ralf Baechledcbf8472005-10-10 14:51:27 +0100128
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700129 dev->stats.tx_packets++;
130 dev->stats.tx_bytes += skb->len;
Ralf Baechledcbf8472005-10-10 14:51:27 +0100131
Ralf Baechlec800c5c2008-01-11 17:28:00 +0000132 dev_kfree_skb(skb);
Ralf Baechledcbf8472005-10-10 14:51:27 +0100133}
134
135static int mipsnet_xmit(struct sk_buff *skb, struct net_device *dev)
136{
Ralf Baechlef5e42fb2007-10-23 00:35:26 +0100137 /*
138 * Only one packet at a time. Once TXDONE interrupt is serviced, the
Ralf Baechledcbf8472005-10-10 14:51:27 +0100139 * queue will be restarted.
140 */
141 netif_stop_queue(dev);
142 mipsnet_put_todevice(dev, skb);
143
Patrick McHardy6ed10652009-06-23 06:03:08 +0000144 return NETDEV_TX_OK;
Ralf Baechledcbf8472005-10-10 14:51:27 +0100145}
146
Ralf Baechlec800c5c2008-01-11 17:28:00 +0000147static inline ssize_t mipsnet_get_fromdev(struct net_device *dev, size_t len)
Ralf Baechledcbf8472005-10-10 14:51:27 +0100148{
149 struct sk_buff *skb;
Ralf Baechledcbf8472005-10-10 14:51:27 +0100150
Ralf Baechlec800c5c2008-01-11 17:28:00 +0000151 if (!len)
152 return len;
153
154 skb = dev_alloc_skb(len + NET_IP_ALIGN);
Ralf Baechlec2af68e2007-10-12 14:59:56 +0100155 if (!skb) {
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700156 dev->stats.rx_dropped++;
Ralf Baechledcbf8472005-10-10 14:51:27 +0100157 return -ENOMEM;
158 }
159
Ralf Baechlec800c5c2008-01-11 17:28:00 +0000160 skb_reserve(skb, NET_IP_ALIGN);
Ralf Baechledcbf8472005-10-10 14:51:27 +0100161 if (ioiocpy_frommipsnet(dev, skb_put(skb, len), len))
162 return -EFAULT;
163
Ralf Baechledcbf8472005-10-10 14:51:27 +0100164 skb->protocol = eth_type_trans(skb, dev);
165 skb->ip_summed = CHECKSUM_UNNECESSARY;
166
Ralf Baechledcbf8472005-10-10 14:51:27 +0100167 netif_rx(skb);
168
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700169 dev->stats.rx_packets++;
170 dev->stats.rx_bytes += len;
Ralf Baechledcbf8472005-10-10 14:51:27 +0100171
Ralf Baechlec800c5c2008-01-11 17:28:00 +0000172 return len;
Ralf Baechledcbf8472005-10-10 14:51:27 +0100173}
174
David Howells7d12e782006-10-05 14:55:46 +0100175static irqreturn_t mipsnet_interrupt(int irq, void *dev_id)
Ralf Baechledcbf8472005-10-10 14:51:27 +0100176{
177 struct net_device *dev = dev_id;
Ralf Baechlec800c5c2008-01-11 17:28:00 +0000178 u32 int_flags;
179 irqreturn_t ret = IRQ_NONE;
Ralf Baechledcbf8472005-10-10 14:51:27 +0100180
Ralf Baechlec800c5c2008-01-11 17:28:00 +0000181 if (irq != dev->irq)
182 goto out_badirq;
Ralf Baechledcbf8472005-10-10 14:51:27 +0100183
Ralf Baechlec800c5c2008-01-11 17:28:00 +0000184 /* TESTBIT is cleared on read. */
185 int_flags = inl(regaddr(dev, interruptControl));
186 if (int_flags & MIPSNET_INTCTL_TESTBIT) {
187 /* TESTBIT takes effect after a write with 0. */
188 outl(0, regaddr(dev, interruptControl));
189 ret = IRQ_HANDLED;
190 } else if (int_flags & MIPSNET_INTCTL_TXDONE) {
191 /* Only one packet at a time, we are done. */
192 dev->stats.tx_packets++;
193 netif_wake_queue(dev);
194 outl(MIPSNET_INTCTL_TXDONE,
195 regaddr(dev, interruptControl));
196 ret = IRQ_HANDLED;
197 } else if (int_flags & MIPSNET_INTCTL_RXDONE) {
198 mipsnet_get_fromdev(dev, inl(regaddr(dev, rxDataCount)));
199 outl(MIPSNET_INTCTL_RXDONE, regaddr(dev, interruptControl));
200 ret = IRQ_HANDLED;
Ralf Baechledcbf8472005-10-10 14:51:27 +0100201 }
Ralf Baechlec800c5c2008-01-11 17:28:00 +0000202 return ret;
203
204out_badirq:
205 printk(KERN_INFO "%s: %s(): irq %d for unknown device\n",
Harvey Harrisonb39d66a2008-08-20 16:52:04 -0700206 dev->name, __func__, irq);
Ralf Baechlec800c5c2008-01-11 17:28:00 +0000207 return ret;
Ralf Baechlec2af68e2007-10-12 14:59:56 +0100208}
Ralf Baechledcbf8472005-10-10 14:51:27 +0100209
210static int mipsnet_open(struct net_device *dev)
211{
212 int err;
Ralf Baechledcbf8472005-10-10 14:51:27 +0100213
Joe Perchesa0607fd2009-11-18 23:29:17 -0800214 err = request_irq(dev->irq, mipsnet_interrupt,
Thomas Gleixner1fb9df52006-07-01 19:29:39 -0700215 IRQF_SHARED, dev->name, (void *) dev);
Ralf Baechledcbf8472005-10-10 14:51:27 +0100216 if (err) {
Ralf Baechlec800c5c2008-01-11 17:28:00 +0000217 release_region(dev->base_addr, sizeof(struct mipsnet_regs));
Ralf Baechledcbf8472005-10-10 14:51:27 +0100218 return err;
219 }
220
Ralf Baechledcbf8472005-10-10 14:51:27 +0100221 netif_start_queue(dev);
222
Ralf Baechlec2af68e2007-10-12 14:59:56 +0100223 /* test interrupt handler */
Ralf Baechlec800c5c2008-01-11 17:28:00 +0000224 outl(MIPSNET_INTCTL_TESTBIT, regaddr(dev, interruptControl));
Ralf Baechledcbf8472005-10-10 14:51:27 +0100225
226 return 0;
227}
228
229static int mipsnet_close(struct net_device *dev)
230{
Ralf Baechledcbf8472005-10-10 14:51:27 +0100231 netif_stop_queue(dev);
Ralf Baechlec800c5c2008-01-11 17:28:00 +0000232 free_irq(dev->irq, dev);
Ralf Baechledcbf8472005-10-10 14:51:27 +0100233 return 0;
234}
235
Ralf Baechledcbf8472005-10-10 14:51:27 +0100236static void mipsnet_set_mclist(struct net_device *dev)
237{
Ralf Baechledcbf8472005-10-10 14:51:27 +0100238}
239
Alexander Beregalovd6771e02009-04-15 12:52:51 +0000240static const struct net_device_ops mipsnet_netdev_ops = {
241 .ndo_open = mipsnet_open,
242 .ndo_stop = mipsnet_close,
243 .ndo_start_xmit = mipsnet_xmit,
244 .ndo_set_multicast_list = mipsnet_set_mclist,
245 .ndo_change_mtu = eth_change_mtu,
246 .ndo_validate_addr = eth_validate_addr,
247 .ndo_set_mac_address = eth_mac_addr,
248};
249
Ming Lei7a192ec2009-02-06 23:40:12 +0800250static int __init mipsnet_probe(struct platform_device *dev)
Ralf Baechledcbf8472005-10-10 14:51:27 +0100251{
252 struct net_device *netdev;
253 int err;
254
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700255 netdev = alloc_etherdev(0);
Ralf Baechledcbf8472005-10-10 14:51:27 +0100256 if (!netdev) {
257 err = -ENOMEM;
258 goto out;
259 }
260
Ming Lei7a192ec2009-02-06 23:40:12 +0800261 platform_set_drvdata(dev, netdev);
Ralf Baechledcbf8472005-10-10 14:51:27 +0100262
Alexander Beregalovd6771e02009-04-15 12:52:51 +0000263 netdev->netdev_ops = &mipsnet_netdev_ops;
Ralf Baechledcbf8472005-10-10 14:51:27 +0100264
265 /*
266 * TODO: probe for these or load them from PARAM
267 */
268 netdev->base_addr = 0x4200;
Ralf Baechle3b1d4ed2007-06-20 22:27:10 +0100269 netdev->irq = MIPS_CPU_IRQ_BASE + MIPSCPU_INT_MB0 +
Ralf Baechlec800c5c2008-01-11 17:28:00 +0000270 inl(regaddr(netdev, interruptInfo));
Ralf Baechledcbf8472005-10-10 14:51:27 +0100271
Ralf Baechlec2af68e2007-10-12 14:59:56 +0100272 /* Get the io region now, get irq on open() */
Ralf Baechlec800c5c2008-01-11 17:28:00 +0000273 if (!request_region(netdev->base_addr, sizeof(struct mipsnet_regs),
274 "mipsnet")) {
Ralf Baechledcbf8472005-10-10 14:51:27 +0100275 err = -EBUSY;
276 goto out_free_netdev;
277 }
278
279 /*
280 * Lacking any better mechanism to allocate a MAC address we use a
281 * random one ...
282 */
283 random_ether_addr(netdev->dev_addr);
284
285 err = register_netdev(netdev);
286 if (err) {
287 printk(KERN_ERR "MIPSNet: failed to register netdev.\n");
288 goto out_free_region;
289 }
290
291 return 0;
292
293out_free_region:
Ralf Baechlec800c5c2008-01-11 17:28:00 +0000294 release_region(netdev->base_addr, sizeof(struct mipsnet_regs));
Ralf Baechledcbf8472005-10-10 14:51:27 +0100295
296out_free_netdev:
297 free_netdev(netdev);
298
299out:
300 return err;
301}
302
Ming Lei7a192ec2009-02-06 23:40:12 +0800303static int __devexit mipsnet_device_remove(struct platform_device *device)
Ralf Baechledcbf8472005-10-10 14:51:27 +0100304{
Ming Lei7a192ec2009-02-06 23:40:12 +0800305 struct net_device *dev = platform_get_drvdata(device);
Ralf Baechledcbf8472005-10-10 14:51:27 +0100306
307 unregister_netdev(dev);
Ralf Baechlec800c5c2008-01-11 17:28:00 +0000308 release_region(dev->base_addr, sizeof(struct mipsnet_regs));
Ralf Baechledcbf8472005-10-10 14:51:27 +0100309 free_netdev(dev);
Ming Lei7a192ec2009-02-06 23:40:12 +0800310 platform_set_drvdata(device, NULL);
Ralf Baechledcbf8472005-10-10 14:51:27 +0100311
312 return 0;
313}
314
Ming Lei7a192ec2009-02-06 23:40:12 +0800315static struct platform_driver mipsnet_driver = {
316 .driver = {
317 .name = mipsnet_string,
318 .owner = THIS_MODULE,
319 },
320 .probe = mipsnet_probe,
321 .remove = __devexit_p(mipsnet_device_remove),
Ralf Baechledcbf8472005-10-10 14:51:27 +0100322};
323
Ralf Baechledcbf8472005-10-10 14:51:27 +0100324static int __init mipsnet_init_module(void)
325{
Ralf Baechledcbf8472005-10-10 14:51:27 +0100326 int err;
327
328 printk(KERN_INFO "MIPSNet Ethernet driver. Version: %s. "
329 "(c)2005 MIPS Technologies, Inc.\n", MIPSNET_VERSION);
330
Ming Lei7a192ec2009-02-06 23:40:12 +0800331 err = platform_driver_register(&mipsnet_driver);
Ralf Baechle1e2b9802007-03-18 23:21:22 +0000332 if (err)
Ralf Baechledcbf8472005-10-10 14:51:27 +0100333 printk(KERN_ERR "Driver registration failed\n");
Ralf Baechledcbf8472005-10-10 14:51:27 +0100334
Ralf Baechledcbf8472005-10-10 14:51:27 +0100335 return err;
336}
337
338static void __exit mipsnet_exit_module(void)
339{
Ming Lei7a192ec2009-02-06 23:40:12 +0800340 platform_driver_unregister(&mipsnet_driver);
Ralf Baechledcbf8472005-10-10 14:51:27 +0100341}
342
343module_init(mipsnet_init_module);
344module_exit(mipsnet_exit_module);