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)); | |
f5e42fba | 33 | |
dcbf8477 RB |
34 | if (available_len < len) |
35 | return -EFAULT; | |
36 | ||
c2af68e5 | 37 | for (; len > 0; len--, kdata++) |
dcbf8477 | 38 | *kdata = inb(mipsnet_reg_address(dev, rxDataBuffer)); |
dcbf8477 RB |
39 | |
40 | return inl(mipsnet_reg_address(dev, rxDataCount)); | |
41 | } | |
42 | ||
43 | static inline ssize_t mipsnet_put_todevice(struct net_device *dev, | |
44 | struct sk_buff *skb) | |
45 | { | |
46 | int count_to_go = skb->len; | |
47 | char *buf_ptr = skb->data; | |
dcbf8477 | 48 | |
dcbf8477 RB |
49 | outl(skb->len, mipsnet_reg_address(dev, txDataCount)); |
50 | ||
c2af68e5 | 51 | for (; count_to_go; buf_ptr++, count_to_go--) |
dcbf8477 | 52 | outb(*buf_ptr, mipsnet_reg_address(dev, txDataBuffer)); |
dcbf8477 | 53 | |
09f75cd7 JG |
54 | dev->stats.tx_packets++; |
55 | dev->stats.tx_bytes += skb->len; | |
dcbf8477 RB |
56 | |
57 | return skb->len; | |
58 | } | |
59 | ||
60 | static int mipsnet_xmit(struct sk_buff *skb, struct net_device *dev) | |
61 | { | |
f5e42fba RB |
62 | /* |
63 | * Only one packet at a time. Once TXDONE interrupt is serviced, the | |
dcbf8477 RB |
64 | * queue will be restarted. |
65 | */ | |
66 | netif_stop_queue(dev); | |
67 | mipsnet_put_todevice(dev, skb); | |
68 | ||
69 | return 0; | |
70 | } | |
71 | ||
72 | static inline ssize_t mipsnet_get_fromdev(struct net_device *dev, size_t count) | |
73 | { | |
74 | struct sk_buff *skb; | |
75 | size_t len = count; | |
dcbf8477 | 76 | |
c2af68e5 RB |
77 | skb = alloc_skb(len + 2, GFP_KERNEL); |
78 | if (!skb) { | |
09f75cd7 | 79 | dev->stats.rx_dropped++; |
dcbf8477 RB |
80 | return -ENOMEM; |
81 | } | |
82 | ||
83 | skb_reserve(skb, 2); | |
84 | if (ioiocpy_frommipsnet(dev, skb_put(skb, len), len)) | |
85 | return -EFAULT; | |
86 | ||
dcbf8477 RB |
87 | skb->protocol = eth_type_trans(skb, dev); |
88 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
89 | ||
dcbf8477 RB |
90 | netif_rx(skb); |
91 | ||
09f75cd7 JG |
92 | dev->stats.rx_packets++; |
93 | dev->stats.rx_bytes += len; | |
dcbf8477 RB |
94 | |
95 | return count; | |
96 | } | |
97 | ||
7d12e780 | 98 | static irqreturn_t mipsnet_interrupt(int irq, void *dev_id) |
dcbf8477 RB |
99 | { |
100 | struct net_device *dev = dev_id; | |
101 | ||
102 | irqreturn_t retval = IRQ_NONE; | |
103 | uint64_t interruptFlags; | |
104 | ||
105 | if (irq == dev->irq) { | |
dcbf8477 RB |
106 | retval = IRQ_HANDLED; |
107 | ||
108 | interruptFlags = | |
109 | inl(mipsnet_reg_address(dev, interruptControl)); | |
dcbf8477 RB |
110 | |
111 | if (interruptFlags & MIPSNET_INTCTL_TXDONE) { | |
dcbf8477 RB |
112 | outl(MIPSNET_INTCTL_TXDONE, |
113 | mipsnet_reg_address(dev, interruptControl)); | |
c2af68e5 | 114 | /* only one packet at a time, we are done. */ |
dcbf8477 RB |
115 | netif_wake_queue(dev); |
116 | } else if (interruptFlags & MIPSNET_INTCTL_RXDONE) { | |
dcbf8477 | 117 | mipsnet_get_fromdev(dev, |
c2af68e5 | 118 | inl(mipsnet_reg_address(dev, rxDataCount))); |
dcbf8477 RB |
119 | outl(MIPSNET_INTCTL_RXDONE, |
120 | mipsnet_reg_address(dev, interruptControl)); | |
121 | ||
122 | } else if (interruptFlags & MIPSNET_INTCTL_TESTBIT) { | |
c2af68e5 RB |
123 | /* |
124 | * TESTBIT is cleared on read. | |
125 | * And takes effect after a write with 0 | |
126 | */ | |
dcbf8477 RB |
127 | outl(0, mipsnet_reg_address(dev, interruptControl)); |
128 | } else { | |
c2af68e5 | 129 | /* Maybe shared IRQ, just ignore, no clearing. */ |
dcbf8477 RB |
130 | retval = IRQ_NONE; |
131 | } | |
132 | ||
133 | } else { | |
134 | printk(KERN_INFO "%s: %s(): irq %d for unknown device\n", | |
135 | dev->name, __FUNCTION__, irq); | |
136 | retval = IRQ_NONE; | |
137 | } | |
138 | return retval; | |
c2af68e5 | 139 | } |
dcbf8477 RB |
140 | |
141 | static int mipsnet_open(struct net_device *dev) | |
142 | { | |
143 | int err; | |
dcbf8477 RB |
144 | |
145 | err = request_irq(dev->irq, &mipsnet_interrupt, | |
1fb9df5d | 146 | IRQF_SHARED, dev->name, (void *) dev); |
dcbf8477 RB |
147 | |
148 | if (err) { | |
dcbf8477 RB |
149 | release_region(dev->base_addr, MIPSNET_IO_EXTENT); |
150 | return err; | |
151 | } | |
152 | ||
dcbf8477 RB |
153 | netif_start_queue(dev); |
154 | ||
c2af68e5 | 155 | /* test interrupt handler */ |
dcbf8477 RB |
156 | outl(MIPSNET_INTCTL_TESTBIT, |
157 | mipsnet_reg_address(dev, interruptControl)); | |
158 | ||
159 | ||
160 | return 0; | |
161 | } | |
162 | ||
163 | static int mipsnet_close(struct net_device *dev) | |
164 | { | |
dcbf8477 | 165 | netif_stop_queue(dev); |
f5e42fba | 166 | |
dcbf8477 RB |
167 | return 0; |
168 | } | |
169 | ||
dcbf8477 RB |
170 | static void mipsnet_set_mclist(struct net_device *dev) |
171 | { | |
dcbf8477 RB |
172 | } |
173 | ||
174 | static int __init mipsnet_probe(struct device *dev) | |
175 | { | |
176 | struct net_device *netdev; | |
177 | int err; | |
178 | ||
09f75cd7 | 179 | netdev = alloc_etherdev(0); |
dcbf8477 RB |
180 | if (!netdev) { |
181 | err = -ENOMEM; | |
182 | goto out; | |
183 | } | |
184 | ||
185 | dev_set_drvdata(dev, netdev); | |
186 | ||
187 | netdev->open = mipsnet_open; | |
188 | netdev->stop = mipsnet_close; | |
189 | netdev->hard_start_xmit = mipsnet_xmit; | |
dcbf8477 RB |
190 | netdev->set_multicast_list = mipsnet_set_mclist; |
191 | ||
192 | /* | |
193 | * TODO: probe for these or load them from PARAM | |
194 | */ | |
195 | netdev->base_addr = 0x4200; | |
3b1d4ed5 | 196 | netdev->irq = MIPS_CPU_IRQ_BASE + MIPSCPU_INT_MB0 + |
c2af68e5 | 197 | inl(mipsnet_reg_address(netdev, interruptInfo)); |
dcbf8477 | 198 | |
c2af68e5 | 199 | /* Get the io region now, get irq on open() */ |
dcbf8477 | 200 | if (!request_region(netdev->base_addr, MIPSNET_IO_EXTENT, "mipsnet")) { |
dcbf8477 RB |
201 | err = -EBUSY; |
202 | goto out_free_netdev; | |
203 | } | |
204 | ||
205 | /* | |
206 | * Lacking any better mechanism to allocate a MAC address we use a | |
207 | * random one ... | |
208 | */ | |
209 | random_ether_addr(netdev->dev_addr); | |
210 | ||
211 | err = register_netdev(netdev); | |
212 | if (err) { | |
213 | printk(KERN_ERR "MIPSNet: failed to register netdev.\n"); | |
214 | goto out_free_region; | |
215 | } | |
216 | ||
217 | return 0; | |
218 | ||
219 | out_free_region: | |
220 | release_region(netdev->base_addr, MIPSNET_IO_EXTENT); | |
221 | ||
222 | out_free_netdev: | |
223 | free_netdev(netdev); | |
224 | ||
225 | out: | |
226 | return err; | |
227 | } | |
228 | ||
229 | static int __devexit mipsnet_device_remove(struct device *device) | |
230 | { | |
231 | struct net_device *dev = dev_get_drvdata(device); | |
232 | ||
233 | unregister_netdev(dev); | |
234 | release_region(dev->base_addr, MIPSNET_IO_EXTENT); | |
235 | free_netdev(dev); | |
236 | dev_set_drvdata(device, NULL); | |
237 | ||
238 | return 0; | |
239 | } | |
240 | ||
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), | |
246 | }; | |
247 | ||
dcbf8477 RB |
248 | static int __init mipsnet_init_module(void) |
249 | { | |
dcbf8477 RB |
250 | int err; |
251 | ||
252 | printk(KERN_INFO "MIPSNet Ethernet driver. Version: %s. " | |
253 | "(c)2005 MIPS Technologies, Inc.\n", MIPSNET_VERSION); | |
254 | ||
1e2b980f RB |
255 | err = driver_register(&mipsnet_driver); |
256 | if (err) | |
dcbf8477 | 257 | printk(KERN_ERR "Driver registration failed\n"); |
dcbf8477 | 258 | |
dcbf8477 RB |
259 | return err; |
260 | } | |
261 | ||
262 | static void __exit mipsnet_exit_module(void) | |
263 | { | |
dcbf8477 RB |
264 | driver_unregister(&mipsnet_driver); |
265 | } | |
266 | ||
267 | module_init(mipsnet_init_module); | |
268 | module_exit(mipsnet_exit_module); |