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