Commit | Line | Data |
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dcbf8477 RB |
1 | /* |
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 | ||
7 | #define DEBUG | |
8 | ||
9 | #include <linux/init.h> | |
c2af68e5 | 10 | #include <linux/io.h> |
dcbf8477 RB |
11 | #include <linux/kernel.h> |
12 | #include <linux/module.h> | |
13 | #include <linux/netdevice.h> | |
dcbf8477 | 14 | #include <linux/etherdevice.h> |
d052d1be | 15 | #include <linux/platform_device.h> |
dcbf8477 RB |
16 | #include <asm/mips-boards/simint.h> |
17 | ||
18 | #include "mipsnet.h" /* actual device IO mapping */ | |
19 | ||
20 | #define MIPSNET_VERSION "2005-06-20" | |
21 | ||
22 | #define mipsnet_reg_address(dev, field) (dev->base_addr + field_offset(field)) | |
23 | ||
dcbf8477 RB |
24 | static char mipsnet_string[] = "mipsnet"; |
25 | ||
26 | /* | |
27 | * Copy data from the MIPSNET rx data port | |
28 | */ | |
29 | static int ioiocpy_frommipsnet(struct net_device *dev, unsigned char *kdata, | |
30 | int len) | |
31 | { | |
32 | uint32_t available_len = inl(mipsnet_reg_address(dev, rxDataCount)); | |
33 | if (available_len < len) | |
34 | return -EFAULT; | |
35 | ||
c2af68e5 | 36 | for (; len > 0; len--, kdata++) |
dcbf8477 | 37 | *kdata = inb(mipsnet_reg_address(dev, rxDataBuffer)); |
dcbf8477 RB |
38 | |
39 | return inl(mipsnet_reg_address(dev, rxDataCount)); | |
40 | } | |
41 | ||
42 | static inline ssize_t mipsnet_put_todevice(struct net_device *dev, | |
43 | struct sk_buff *skb) | |
44 | { | |
45 | int count_to_go = skb->len; | |
46 | char *buf_ptr = skb->data; | |
dcbf8477 RB |
47 | |
48 | pr_debug("%s: %s(): telling MIPSNET txDataCount(%d)\n", | |
c2af68e5 | 49 | dev->name, __FUNCTION__, skb->len); |
dcbf8477 RB |
50 | |
51 | outl(skb->len, mipsnet_reg_address(dev, txDataCount)); | |
52 | ||
53 | pr_debug("%s: %s(): sending data to MIPSNET txDataBuffer(%d)\n", | |
c2af68e5 | 54 | dev->name, __FUNCTION__, skb->len); |
dcbf8477 | 55 | |
c2af68e5 | 56 | for (; count_to_go; buf_ptr++, count_to_go--) |
dcbf8477 | 57 | outb(*buf_ptr, mipsnet_reg_address(dev, txDataBuffer)); |
dcbf8477 | 58 | |
09f75cd7 JG |
59 | dev->stats.tx_packets++; |
60 | dev->stats.tx_bytes += skb->len; | |
dcbf8477 RB |
61 | |
62 | return skb->len; | |
63 | } | |
64 | ||
65 | static int mipsnet_xmit(struct sk_buff *skb, struct net_device *dev) | |
66 | { | |
67 | pr_debug("%s:%s(): transmitting %d bytes\n", | |
c2af68e5 | 68 | dev->name, __FUNCTION__, skb->len); |
dcbf8477 RB |
69 | |
70 | /* Only one packet at a time. Once TXDONE interrupt is serviced, the | |
71 | * queue will be restarted. | |
72 | */ | |
73 | netif_stop_queue(dev); | |
74 | mipsnet_put_todevice(dev, skb); | |
75 | ||
76 | return 0; | |
77 | } | |
78 | ||
79 | static inline ssize_t mipsnet_get_fromdev(struct net_device *dev, size_t count) | |
80 | { | |
81 | struct sk_buff *skb; | |
82 | size_t len = count; | |
dcbf8477 | 83 | |
c2af68e5 RB |
84 | skb = alloc_skb(len + 2, GFP_KERNEL); |
85 | if (!skb) { | |
09f75cd7 | 86 | dev->stats.rx_dropped++; |
dcbf8477 RB |
87 | return -ENOMEM; |
88 | } | |
89 | ||
90 | skb_reserve(skb, 2); | |
91 | if (ioiocpy_frommipsnet(dev, skb_put(skb, len), len)) | |
92 | return -EFAULT; | |
93 | ||
dcbf8477 RB |
94 | skb->protocol = eth_type_trans(skb, dev); |
95 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
96 | ||
97 | pr_debug("%s:%s(): pushing RXed data to kernel\n", | |
c2af68e5 | 98 | dev->name, __FUNCTION__); |
dcbf8477 RB |
99 | netif_rx(skb); |
100 | ||
09f75cd7 JG |
101 | dev->stats.rx_packets++; |
102 | dev->stats.rx_bytes += len; | |
dcbf8477 RB |
103 | |
104 | return count; | |
105 | } | |
106 | ||
7d12e780 | 107 | static irqreturn_t mipsnet_interrupt(int irq, void *dev_id) |
dcbf8477 RB |
108 | { |
109 | struct net_device *dev = dev_id; | |
110 | ||
111 | irqreturn_t retval = IRQ_NONE; | |
112 | uint64_t interruptFlags; | |
113 | ||
114 | if (irq == dev->irq) { | |
115 | pr_debug("%s:%s(): irq %d for device\n", | |
c2af68e5 | 116 | dev->name, __FUNCTION__, irq); |
dcbf8477 RB |
117 | |
118 | retval = IRQ_HANDLED; | |
119 | ||
120 | interruptFlags = | |
121 | inl(mipsnet_reg_address(dev, interruptControl)); | |
122 | pr_debug("%s:%s(): intCtl=0x%016llx\n", dev->name, | |
c2af68e5 | 123 | __FUNCTION__, interruptFlags); |
dcbf8477 RB |
124 | |
125 | if (interruptFlags & MIPSNET_INTCTL_TXDONE) { | |
126 | pr_debug("%s:%s(): got TXDone\n", | |
c2af68e5 | 127 | dev->name, __FUNCTION__); |
dcbf8477 RB |
128 | outl(MIPSNET_INTCTL_TXDONE, |
129 | mipsnet_reg_address(dev, interruptControl)); | |
c2af68e5 | 130 | /* only one packet at a time, we are done. */ |
dcbf8477 RB |
131 | netif_wake_queue(dev); |
132 | } else if (interruptFlags & MIPSNET_INTCTL_RXDONE) { | |
133 | pr_debug("%s:%s(): got RX data\n", | |
c2af68e5 | 134 | dev->name, __FUNCTION__); |
dcbf8477 | 135 | mipsnet_get_fromdev(dev, |
c2af68e5 | 136 | inl(mipsnet_reg_address(dev, rxDataCount))); |
dcbf8477 | 137 | pr_debug("%s:%s(): clearing RX int\n", |
c2af68e5 | 138 | dev->name, __FUNCTION__); |
dcbf8477 RB |
139 | outl(MIPSNET_INTCTL_RXDONE, |
140 | mipsnet_reg_address(dev, interruptControl)); | |
141 | ||
142 | } else if (interruptFlags & MIPSNET_INTCTL_TESTBIT) { | |
143 | pr_debug("%s:%s(): got test interrupt\n", | |
c2af68e5 RB |
144 | dev->name, __FUNCTION__); |
145 | /* | |
146 | * TESTBIT is cleared on read. | |
147 | * And takes effect after a write with 0 | |
148 | */ | |
dcbf8477 RB |
149 | outl(0, mipsnet_reg_address(dev, interruptControl)); |
150 | } else { | |
151 | pr_debug("%s:%s(): no valid fags 0x%016llx\n", | |
c2af68e5 RB |
152 | dev->name, __FUNCTION__, interruptFlags); |
153 | /* Maybe shared IRQ, just ignore, no clearing. */ | |
dcbf8477 RB |
154 | retval = IRQ_NONE; |
155 | } | |
156 | ||
157 | } else { | |
158 | printk(KERN_INFO "%s: %s(): irq %d for unknown device\n", | |
159 | dev->name, __FUNCTION__, irq); | |
160 | retval = IRQ_NONE; | |
161 | } | |
162 | return retval; | |
c2af68e5 | 163 | } |
dcbf8477 RB |
164 | |
165 | static int mipsnet_open(struct net_device *dev) | |
166 | { | |
167 | int err; | |
168 | pr_debug("%s: mipsnet_open\n", dev->name); | |
169 | ||
170 | err = request_irq(dev->irq, &mipsnet_interrupt, | |
1fb9df5d | 171 | IRQF_SHARED, dev->name, (void *) dev); |
dcbf8477 RB |
172 | |
173 | if (err) { | |
174 | pr_debug("%s: %s(): can't get irq %d\n", | |
c2af68e5 | 175 | dev->name, __FUNCTION__, dev->irq); |
dcbf8477 RB |
176 | release_region(dev->base_addr, MIPSNET_IO_EXTENT); |
177 | return err; | |
178 | } | |
179 | ||
180 | pr_debug("%s: %s(): got IO region at 0x%04lx and irq %d for dev.\n", | |
c2af68e5 | 181 | dev->name, __FUNCTION__, dev->base_addr, dev->irq); |
dcbf8477 RB |
182 | |
183 | ||
184 | netif_start_queue(dev); | |
185 | ||
c2af68e5 | 186 | /* test interrupt handler */ |
dcbf8477 RB |
187 | outl(MIPSNET_INTCTL_TESTBIT, |
188 | mipsnet_reg_address(dev, interruptControl)); | |
189 | ||
190 | ||
191 | return 0; | |
192 | } | |
193 | ||
194 | static int mipsnet_close(struct net_device *dev) | |
195 | { | |
196 | pr_debug("%s: %s()\n", dev->name, __FUNCTION__); | |
197 | netif_stop_queue(dev); | |
198 | return 0; | |
199 | } | |
200 | ||
dcbf8477 RB |
201 | static void mipsnet_set_mclist(struct net_device *dev) |
202 | { | |
dcbf8477 RB |
203 | } |
204 | ||
205 | static int __init mipsnet_probe(struct device *dev) | |
206 | { | |
207 | struct net_device *netdev; | |
208 | int err; | |
209 | ||
09f75cd7 | 210 | netdev = alloc_etherdev(0); |
dcbf8477 RB |
211 | if (!netdev) { |
212 | err = -ENOMEM; | |
213 | goto out; | |
214 | } | |
215 | ||
216 | dev_set_drvdata(dev, netdev); | |
217 | ||
218 | netdev->open = mipsnet_open; | |
219 | netdev->stop = mipsnet_close; | |
220 | netdev->hard_start_xmit = mipsnet_xmit; | |
dcbf8477 RB |
221 | netdev->set_multicast_list = mipsnet_set_mclist; |
222 | ||
223 | /* | |
224 | * TODO: probe for these or load them from PARAM | |
225 | */ | |
226 | netdev->base_addr = 0x4200; | |
3b1d4ed5 | 227 | netdev->irq = MIPS_CPU_IRQ_BASE + MIPSCPU_INT_MB0 + |
c2af68e5 | 228 | inl(mipsnet_reg_address(netdev, interruptInfo)); |
dcbf8477 | 229 | |
c2af68e5 | 230 | /* Get the io region now, get irq on open() */ |
dcbf8477 RB |
231 | if (!request_region(netdev->base_addr, MIPSNET_IO_EXTENT, "mipsnet")) { |
232 | pr_debug("%s: %s(): IO region {start: 0x%04lux, len: %d} " | |
c2af68e5 RB |
233 | "for dev is not availble.\n", netdev->name, |
234 | __FUNCTION__, netdev->base_addr, MIPSNET_IO_EXTENT); | |
dcbf8477 RB |
235 | err = -EBUSY; |
236 | goto out_free_netdev; | |
237 | } | |
238 | ||
239 | /* | |
240 | * Lacking any better mechanism to allocate a MAC address we use a | |
241 | * random one ... | |
242 | */ | |
243 | random_ether_addr(netdev->dev_addr); | |
244 | ||
245 | err = register_netdev(netdev); | |
246 | if (err) { | |
247 | printk(KERN_ERR "MIPSNet: failed to register netdev.\n"); | |
248 | goto out_free_region; | |
249 | } | |
250 | ||
251 | return 0; | |
252 | ||
253 | out_free_region: | |
254 | release_region(netdev->base_addr, MIPSNET_IO_EXTENT); | |
255 | ||
256 | out_free_netdev: | |
257 | free_netdev(netdev); | |
258 | ||
259 | out: | |
260 | return err; | |
261 | } | |
262 | ||
263 | static int __devexit mipsnet_device_remove(struct device *device) | |
264 | { | |
265 | struct net_device *dev = dev_get_drvdata(device); | |
266 | ||
267 | unregister_netdev(dev); | |
268 | release_region(dev->base_addr, MIPSNET_IO_EXTENT); | |
269 | free_netdev(dev); | |
270 | dev_set_drvdata(device, NULL); | |
271 | ||
272 | return 0; | |
273 | } | |
274 | ||
275 | static struct device_driver mipsnet_driver = { | |
276 | .name = mipsnet_string, | |
277 | .bus = &platform_bus_type, | |
278 | .probe = mipsnet_probe, | |
279 | .remove = __devexit_p(mipsnet_device_remove), | |
280 | }; | |
281 | ||
dcbf8477 RB |
282 | static int __init mipsnet_init_module(void) |
283 | { | |
dcbf8477 RB |
284 | int err; |
285 | ||
286 | printk(KERN_INFO "MIPSNet Ethernet driver. Version: %s. " | |
287 | "(c)2005 MIPS Technologies, Inc.\n", MIPSNET_VERSION); | |
288 | ||
1e2b980f RB |
289 | err = driver_register(&mipsnet_driver); |
290 | if (err) | |
dcbf8477 | 291 | printk(KERN_ERR "Driver registration failed\n"); |
dcbf8477 | 292 | |
dcbf8477 RB |
293 | return err; |
294 | } | |
295 | ||
296 | static void __exit mipsnet_exit_module(void) | |
297 | { | |
298 | pr_debug("MIPSNet Ethernet driver exiting\n"); | |
299 | ||
300 | driver_unregister(&mipsnet_driver); | |
301 | } | |
302 | ||
303 | module_init(mipsnet_init_module); | |
304 | module_exit(mipsnet_exit_module); |