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Commit | Line | Data |
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15d014d1 LB |
1 | /* |
2 | * IXP2000 MSF network device driver | |
3 | * Copyright (C) 2004, 2005 Lennert Buytenhek <buytenh@wantstofly.org> | |
4 | * Dedicated to Marija Kulikova. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | */ | |
11 | ||
15d014d1 LB |
12 | #include <linux/module.h> |
13 | #include <linux/kernel.h> | |
14 | #include <linux/netdevice.h> | |
15 | #include <linux/etherdevice.h> | |
16 | #include <linux/init.h> | |
17 | #include <linux/moduleparam.h> | |
18ec5c73 | 18 | #include <asm/hardware/uengine.h> |
15d014d1 LB |
19 | #include <asm/io.h> |
20 | #include "ixp2400_rx.ucode" | |
21 | #include "ixp2400_tx.ucode" | |
22 | #include "ixpdev_priv.h" | |
23 | #include "ixpdev.h" | |
24 | ||
12747784 LB |
25 | #define DRV_MODULE_VERSION "0.2" |
26 | ||
15d014d1 LB |
27 | static int nds_count; |
28 | static struct net_device **nds; | |
29 | static int nds_open; | |
30 | static void (*set_port_admin_status)(int port, int up); | |
31 | ||
32 | static struct ixpdev_rx_desc * const rx_desc = | |
33 | (struct ixpdev_rx_desc *)(IXP2000_SRAM0_VIRT_BASE + RX_BUF_DESC_BASE); | |
34 | static struct ixpdev_tx_desc * const tx_desc = | |
35 | (struct ixpdev_tx_desc *)(IXP2000_SRAM0_VIRT_BASE + TX_BUF_DESC_BASE); | |
36 | static int tx_pointer; | |
37 | ||
38 | ||
39 | static int ixpdev_xmit(struct sk_buff *skb, struct net_device *dev) | |
40 | { | |
41 | struct ixpdev_priv *ip = netdev_priv(dev); | |
42 | struct ixpdev_tx_desc *desc; | |
43 | int entry; | |
44 | ||
45 | if (unlikely(skb->len > PAGE_SIZE)) { | |
46 | /* @@@ Count drops. */ | |
47 | dev_kfree_skb(skb); | |
6ed10654 | 48 | return NETDEV_TX_OK; |
15d014d1 LB |
49 | } |
50 | ||
51 | entry = tx_pointer; | |
52 | tx_pointer = (tx_pointer + 1) % TX_BUF_COUNT; | |
53 | ||
54 | desc = tx_desc + entry; | |
55 | desc->pkt_length = skb->len; | |
56 | desc->channel = ip->channel; | |
57 | ||
58 | skb_copy_and_csum_dev(skb, phys_to_virt(desc->buf_addr)); | |
59 | dev_kfree_skb(skb); | |
60 | ||
61 | ixp2000_reg_write(RING_TX_PENDING, | |
62 | TX_BUF_DESC_BASE + (entry * sizeof(struct ixpdev_tx_desc))); | |
63 | ||
64 | dev->trans_start = jiffies; | |
65 | ||
66 | local_irq_disable(); | |
67 | ip->tx_queue_entries++; | |
68 | if (ip->tx_queue_entries == TX_BUF_COUNT_PER_CHAN) | |
69 | netif_stop_queue(dev); | |
70 | local_irq_enable(); | |
71 | ||
6ed10654 | 72 | return NETDEV_TX_OK; |
15d014d1 LB |
73 | } |
74 | ||
75 | ||
bea3348e | 76 | static int ixpdev_rx(struct net_device *dev, int processed, int budget) |
15d014d1 | 77 | { |
bea3348e | 78 | while (processed < budget) { |
15d014d1 LB |
79 | struct ixpdev_rx_desc *desc; |
80 | struct sk_buff *skb; | |
81 | void *buf; | |
82 | u32 _desc; | |
83 | ||
84 | _desc = ixp2000_reg_read(RING_RX_DONE); | |
85 | if (_desc == 0) | |
86 | return 0; | |
87 | ||
88 | desc = rx_desc + | |
89 | ((_desc - RX_BUF_DESC_BASE) / sizeof(struct ixpdev_rx_desc)); | |
90 | buf = phys_to_virt(desc->buf_addr); | |
91 | ||
92 | if (desc->pkt_length < 4 || desc->pkt_length > PAGE_SIZE) { | |
93 | printk(KERN_ERR "ixp2000: rx err, length %d\n", | |
94 | desc->pkt_length); | |
95 | goto err; | |
96 | } | |
97 | ||
98 | if (desc->channel < 0 || desc->channel >= nds_count) { | |
99 | printk(KERN_ERR "ixp2000: rx err, channel %d\n", | |
100 | desc->channel); | |
101 | goto err; | |
102 | } | |
103 | ||
104 | /* @@@ Make FCS stripping configurable. */ | |
105 | desc->pkt_length -= 4; | |
106 | ||
107 | if (unlikely(!netif_running(nds[desc->channel]))) | |
108 | goto err; | |
109 | ||
d27e7c3f | 110 | skb = netdev_alloc_skb(dev, desc->pkt_length + 2); |
15d014d1 | 111 | if (likely(skb != NULL)) { |
15d014d1 | 112 | skb_reserve(skb, 2); |
8c7b7faa | 113 | skb_copy_to_linear_data(skb, buf, desc->pkt_length); |
15d014d1 | 114 | skb_put(skb, desc->pkt_length); |
4c13eb66 | 115 | skb->protocol = eth_type_trans(skb, nds[desc->channel]); |
15d014d1 | 116 | |
15d014d1 LB |
117 | netif_receive_skb(skb); |
118 | } | |
119 | ||
120 | err: | |
121 | ixp2000_reg_write(RING_RX_PENDING, _desc); | |
bea3348e | 122 | processed++; |
15d014d1 LB |
123 | } |
124 | ||
bea3348e | 125 | return processed; |
15d014d1 LB |
126 | } |
127 | ||
128 | /* dev always points to nds[0]. */ | |
bea3348e | 129 | static int ixpdev_poll(struct napi_struct *napi, int budget) |
15d014d1 | 130 | { |
bea3348e SH |
131 | struct ixpdev_priv *ip = container_of(napi, struct ixpdev_priv, napi); |
132 | struct net_device *dev = ip->dev; | |
133 | int rx; | |
134 | ||
bea3348e | 135 | rx = 0; |
15d014d1 LB |
136 | do { |
137 | ixp2000_reg_write(IXP2000_IRQ_THD_RAW_STATUS_A_0, 0x00ff); | |
138 | ||
bea3348e SH |
139 | rx = ixpdev_rx(dev, rx, budget); |
140 | if (rx >= budget) | |
141 | break; | |
15d014d1 LB |
142 | } while (ixp2000_reg_read(IXP2000_IRQ_THD_RAW_STATUS_A_0) & 0x00ff); |
143 | ||
288379f0 | 144 | napi_complete(napi); |
15d014d1 LB |
145 | ixp2000_reg_write(IXP2000_IRQ_THD_ENABLE_SET_A_0, 0x00ff); |
146 | ||
bea3348e | 147 | return rx; |
15d014d1 LB |
148 | } |
149 | ||
15d014d1 LB |
150 | static void ixpdev_tx_complete(void) |
151 | { | |
152 | int channel; | |
153 | u32 wake; | |
154 | ||
155 | wake = 0; | |
156 | while (1) { | |
157 | struct ixpdev_priv *ip; | |
158 | u32 desc; | |
159 | int entry; | |
160 | ||
161 | desc = ixp2000_reg_read(RING_TX_DONE); | |
162 | if (desc == 0) | |
163 | break; | |
164 | ||
165 | /* @@@ Check whether entries come back in order. */ | |
166 | entry = (desc - TX_BUF_DESC_BASE) / sizeof(struct ixpdev_tx_desc); | |
167 | channel = tx_desc[entry].channel; | |
168 | ||
169 | if (channel < 0 || channel >= nds_count) { | |
170 | printk(KERN_ERR "ixp2000: txcomp channel index " | |
171 | "out of bounds (%d, %.8i, %d)\n", | |
172 | channel, (unsigned int)desc, entry); | |
173 | continue; | |
174 | } | |
175 | ||
176 | ip = netdev_priv(nds[channel]); | |
177 | if (ip->tx_queue_entries == TX_BUF_COUNT_PER_CHAN) | |
178 | wake |= 1 << channel; | |
179 | ip->tx_queue_entries--; | |
180 | } | |
181 | ||
182 | for (channel = 0; wake != 0; channel++) { | |
183 | if (wake & (1 << channel)) { | |
184 | netif_wake_queue(nds[channel]); | |
185 | wake &= ~(1 << channel); | |
186 | } | |
187 | } | |
188 | } | |
189 | ||
7d12e780 | 190 | static irqreturn_t ixpdev_interrupt(int irq, void *dev_id) |
15d014d1 LB |
191 | { |
192 | u32 status; | |
193 | ||
194 | status = ixp2000_reg_read(IXP2000_IRQ_THD_STATUS_A_0); | |
195 | if (status == 0) | |
196 | return IRQ_NONE; | |
197 | ||
198 | /* | |
199 | * Any of the eight receive units signaled RX? | |
200 | */ | |
201 | if (status & 0x00ff) { | |
bea3348e SH |
202 | struct net_device *dev = nds[0]; |
203 | struct ixpdev_priv *ip = netdev_priv(dev); | |
204 | ||
15d014d1 | 205 | ixp2000_reg_wrb(IXP2000_IRQ_THD_ENABLE_CLEAR_A_0, 0x00ff); |
bea3348e | 206 | if (likely(napi_schedule_prep(&ip->napi))) { |
288379f0 | 207 | __napi_schedule(&ip->napi); |
15d014d1 LB |
208 | } else { |
209 | printk(KERN_CRIT "ixp2000: irq while polling!!\n"); | |
210 | } | |
211 | } | |
212 | ||
213 | /* | |
214 | * Any of the eight transmit units signaled TXdone? | |
215 | */ | |
216 | if (status & 0xff00) { | |
217 | ixp2000_reg_wrb(IXP2000_IRQ_THD_RAW_STATUS_A_0, 0xff00); | |
218 | ixpdev_tx_complete(); | |
219 | } | |
220 | ||
221 | return IRQ_HANDLED; | |
222 | } | |
223 | ||
8ce51d69 LB |
224 | #ifdef CONFIG_NET_POLL_CONTROLLER |
225 | static void ixpdev_poll_controller(struct net_device *dev) | |
226 | { | |
227 | disable_irq(IRQ_IXP2000_THDA0); | |
0da2f0f1 | 228 | ixpdev_interrupt(IRQ_IXP2000_THDA0, dev); |
8ce51d69 LB |
229 | enable_irq(IRQ_IXP2000_THDA0); |
230 | } | |
231 | #endif | |
232 | ||
15d014d1 LB |
233 | static int ixpdev_open(struct net_device *dev) |
234 | { | |
235 | struct ixpdev_priv *ip = netdev_priv(dev); | |
236 | int err; | |
237 | ||
bea3348e | 238 | napi_enable(&ip->napi); |
15d014d1 LB |
239 | if (!nds_open++) { |
240 | err = request_irq(IRQ_IXP2000_THDA0, ixpdev_interrupt, | |
1fb9df5d | 241 | IRQF_SHARED, "ixp2000_eth", nds); |
15d014d1 LB |
242 | if (err) { |
243 | nds_open--; | |
bea3348e | 244 | napi_disable(&ip->napi); |
15d014d1 LB |
245 | return err; |
246 | } | |
247 | ||
248 | ixp2000_reg_write(IXP2000_IRQ_THD_ENABLE_SET_A_0, 0xffff); | |
249 | } | |
250 | ||
251 | set_port_admin_status(ip->channel, 1); | |
252 | netif_start_queue(dev); | |
253 | ||
254 | return 0; | |
255 | } | |
256 | ||
257 | static int ixpdev_close(struct net_device *dev) | |
258 | { | |
259 | struct ixpdev_priv *ip = netdev_priv(dev); | |
260 | ||
261 | netif_stop_queue(dev); | |
bea3348e | 262 | napi_disable(&ip->napi); |
15d014d1 LB |
263 | set_port_admin_status(ip->channel, 0); |
264 | ||
265 | if (!--nds_open) { | |
266 | ixp2000_reg_write(IXP2000_IRQ_THD_ENABLE_CLEAR_A_0, 0xffff); | |
267 | free_irq(IRQ_IXP2000_THDA0, nds); | |
268 | } | |
269 | ||
270 | return 0; | |
271 | } | |
272 | ||
e7090e34 AB |
273 | static const struct net_device_ops ixpdev_netdev_ops = { |
274 | .ndo_open = ixpdev_open, | |
275 | .ndo_stop = ixpdev_close, | |
276 | .ndo_start_xmit = ixpdev_xmit, | |
277 | .ndo_change_mtu = eth_change_mtu, | |
278 | .ndo_validate_addr = eth_validate_addr, | |
279 | .ndo_set_mac_address = eth_mac_addr, | |
280 | #ifdef CONFIG_NET_POLL_CONTROLLER | |
281 | .ndo_poll_controller = ixpdev_poll_controller, | |
282 | #endif | |
283 | }; | |
284 | ||
15d014d1 LB |
285 | struct net_device *ixpdev_alloc(int channel, int sizeof_priv) |
286 | { | |
287 | struct net_device *dev; | |
288 | struct ixpdev_priv *ip; | |
289 | ||
290 | dev = alloc_etherdev(sizeof_priv); | |
291 | if (dev == NULL) | |
292 | return NULL; | |
293 | ||
e7090e34 | 294 | dev->netdev_ops = &ixpdev_netdev_ops; |
15d014d1 LB |
295 | |
296 | dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM; | |
15d014d1 LB |
297 | |
298 | ip = netdev_priv(dev); | |
bea3348e SH |
299 | ip->dev = dev; |
300 | netif_napi_add(dev, &ip->napi, ixpdev_poll, 64); | |
15d014d1 LB |
301 | ip->channel = channel; |
302 | ip->tx_queue_entries = 0; | |
303 | ||
304 | return dev; | |
305 | } | |
306 | ||
307 | int ixpdev_init(int __nds_count, struct net_device **__nds, | |
308 | void (*__set_port_admin_status)(int port, int up)) | |
309 | { | |
310 | int i; | |
311 | int err; | |
312 | ||
5d4fe2c1 | 313 | BUILD_BUG_ON(RX_BUF_COUNT > 192 || TX_BUF_COUNT > 192); |
15d014d1 | 314 | |
12747784 LB |
315 | printk(KERN_INFO "IXP2000 MSF ethernet driver %s\n", DRV_MODULE_VERSION); |
316 | ||
15d014d1 LB |
317 | nds_count = __nds_count; |
318 | nds = __nds; | |
319 | set_port_admin_status = __set_port_admin_status; | |
320 | ||
15d014d1 LB |
321 | for (i = 0; i < RX_BUF_COUNT; i++) { |
322 | void *buf; | |
323 | ||
324 | buf = (void *)get_zeroed_page(GFP_KERNEL); | |
325 | if (buf == NULL) { | |
326 | err = -ENOMEM; | |
327 | while (--i >= 0) | |
328 | free_page((unsigned long)phys_to_virt(rx_desc[i].buf_addr)); | |
0c49919a | 329 | goto err_out; |
15d014d1 LB |
330 | } |
331 | rx_desc[i].buf_addr = virt_to_phys(buf); | |
332 | rx_desc[i].buf_length = PAGE_SIZE; | |
333 | } | |
334 | ||
335 | /* @@@ Maybe we shouldn't be preallocating TX buffers. */ | |
336 | for (i = 0; i < TX_BUF_COUNT; i++) { | |
337 | void *buf; | |
338 | ||
339 | buf = (void *)get_zeroed_page(GFP_KERNEL); | |
340 | if (buf == NULL) { | |
341 | err = -ENOMEM; | |
342 | while (--i >= 0) | |
343 | free_page((unsigned long)phys_to_virt(tx_desc[i].buf_addr)); | |
344 | goto err_free_rx; | |
345 | } | |
346 | tx_desc[i].buf_addr = virt_to_phys(buf); | |
347 | } | |
348 | ||
349 | /* 256 entries, ring status set means 'empty', base address 0x0000. */ | |
350 | ixp2000_reg_write(RING_RX_PENDING_BASE, 0x44000000); | |
351 | ixp2000_reg_write(RING_RX_PENDING_HEAD, 0x00000000); | |
352 | ixp2000_reg_write(RING_RX_PENDING_TAIL, 0x00000000); | |
353 | ||
354 | /* 256 entries, ring status set means 'full', base address 0x0400. */ | |
355 | ixp2000_reg_write(RING_RX_DONE_BASE, 0x40000400); | |
356 | ixp2000_reg_write(RING_RX_DONE_HEAD, 0x00000000); | |
357 | ixp2000_reg_write(RING_RX_DONE_TAIL, 0x00000000); | |
358 | ||
359 | for (i = 0; i < RX_BUF_COUNT; i++) { | |
360 | ixp2000_reg_write(RING_RX_PENDING, | |
361 | RX_BUF_DESC_BASE + (i * sizeof(struct ixpdev_rx_desc))); | |
362 | } | |
363 | ||
364 | ixp2000_uengine_load(0, &ixp2400_rx); | |
365 | ixp2000_uengine_start_contexts(0, 0xff); | |
366 | ||
15d014d1 LB |
367 | /* 256 entries, ring status set means 'empty', base address 0x0800. */ |
368 | ixp2000_reg_write(RING_TX_PENDING_BASE, 0x44000800); | |
369 | ixp2000_reg_write(RING_TX_PENDING_HEAD, 0x00000000); | |
370 | ixp2000_reg_write(RING_TX_PENDING_TAIL, 0x00000000); | |
371 | ||
372 | /* 256 entries, ring status set means 'full', base address 0x0c00. */ | |
373 | ixp2000_reg_write(RING_TX_DONE_BASE, 0x40000c00); | |
374 | ixp2000_reg_write(RING_TX_DONE_HEAD, 0x00000000); | |
375 | ixp2000_reg_write(RING_TX_DONE_TAIL, 0x00000000); | |
376 | ||
377 | ixp2000_uengine_load(1, &ixp2400_tx); | |
378 | ixp2000_uengine_start_contexts(1, 0xff); | |
379 | ||
0c49919a LB |
380 | for (i = 0; i < nds_count; i++) { |
381 | err = register_netdev(nds[i]); | |
382 | if (err) { | |
383 | while (--i >= 0) | |
384 | unregister_netdev(nds[i]); | |
385 | goto err_free_tx; | |
386 | } | |
387 | } | |
388 | ||
7ed98bfd LB |
389 | for (i = 0; i < nds_count; i++) { |
390 | printk(KERN_INFO "%s: IXP2000 MSF ethernet (port %d), " | |
391 | "%.2x:%.2x:%.2x:%.2x:%.2x:%.2x.\n", nds[i]->name, i, | |
392 | nds[i]->dev_addr[0], nds[i]->dev_addr[1], | |
393 | nds[i]->dev_addr[2], nds[i]->dev_addr[3], | |
394 | nds[i]->dev_addr[4], nds[i]->dev_addr[5]); | |
395 | } | |
396 | ||
15d014d1 LB |
397 | return 0; |
398 | ||
0c49919a LB |
399 | err_free_tx: |
400 | for (i = 0; i < TX_BUF_COUNT; i++) | |
401 | free_page((unsigned long)phys_to_virt(tx_desc[i].buf_addr)); | |
402 | ||
15d014d1 LB |
403 | err_free_rx: |
404 | for (i = 0; i < RX_BUF_COUNT; i++) | |
405 | free_page((unsigned long)phys_to_virt(rx_desc[i].buf_addr)); | |
406 | ||
15d014d1 LB |
407 | err_out: |
408 | return err; | |
409 | } | |
410 | ||
411 | void ixpdev_deinit(void) | |
412 | { | |
413 | int i; | |
414 | ||
415 | /* @@@ Flush out pending packets. */ | |
416 | ||
0c49919a LB |
417 | for (i = 0; i < nds_count; i++) |
418 | unregister_netdev(nds[i]); | |
419 | ||
15d014d1 LB |
420 | ixp2000_uengine_stop_contexts(1, 0xff); |
421 | ixp2000_uengine_stop_contexts(0, 0xff); | |
422 | ixp2000_uengine_reset(0x3); | |
423 | ||
424 | for (i = 0; i < TX_BUF_COUNT; i++) | |
425 | free_page((unsigned long)phys_to_virt(tx_desc[i].buf_addr)); | |
426 | ||
427 | for (i = 0; i < RX_BUF_COUNT; i++) | |
428 | free_page((unsigned long)phys_to_virt(rx_desc[i].buf_addr)); | |
15d014d1 | 429 | } |