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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 | ||
77 | static int ixpdev_rx(struct net_device *dev, int *budget) | |
78 | { | |
79 | while (*budget > 0) { | |
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)) { | |
113 | skb->dev = nds[desc->channel]; | |
114 | skb_reserve(skb, 2); | |
115 | eth_copy_and_sum(skb, buf, desc->pkt_length, 0); | |
116 | skb_put(skb, desc->pkt_length); | |
117 | skb->protocol = eth_type_trans(skb, skb->dev); | |
118 | ||
119 | skb->dev->last_rx = jiffies; | |
120 | ||
121 | netif_receive_skb(skb); | |
122 | } | |
123 | ||
124 | err: | |
125 | ixp2000_reg_write(RING_RX_PENDING, _desc); | |
126 | dev->quota--; | |
127 | (*budget)--; | |
128 | } | |
129 | ||
130 | return 1; | |
131 | } | |
132 | ||
133 | /* dev always points to nds[0]. */ | |
134 | static int ixpdev_poll(struct net_device *dev, int *budget) | |
135 | { | |
136 | /* @@@ Have to stop polling when nds[0] is administratively | |
137 | * downed while we are polling. */ | |
138 | do { | |
139 | ixp2000_reg_write(IXP2000_IRQ_THD_RAW_STATUS_A_0, 0x00ff); | |
140 | ||
141 | if (ixpdev_rx(dev, budget)) | |
142 | return 1; | |
143 | } while (ixp2000_reg_read(IXP2000_IRQ_THD_RAW_STATUS_A_0) & 0x00ff); | |
144 | ||
145 | netif_rx_complete(dev); | |
146 | ixp2000_reg_write(IXP2000_IRQ_THD_ENABLE_SET_A_0, 0x00ff); | |
147 | ||
148 | return 0; | |
149 | } | |
150 | ||
15d014d1 LB |
151 | static void ixpdev_tx_complete(void) |
152 | { | |
153 | int channel; | |
154 | u32 wake; | |
155 | ||
156 | wake = 0; | |
157 | while (1) { | |
158 | struct ixpdev_priv *ip; | |
159 | u32 desc; | |
160 | int entry; | |
161 | ||
162 | desc = ixp2000_reg_read(RING_TX_DONE); | |
163 | if (desc == 0) | |
164 | break; | |
165 | ||
166 | /* @@@ Check whether entries come back in order. */ | |
167 | entry = (desc - TX_BUF_DESC_BASE) / sizeof(struct ixpdev_tx_desc); | |
168 | channel = tx_desc[entry].channel; | |
169 | ||
170 | if (channel < 0 || channel >= nds_count) { | |
171 | printk(KERN_ERR "ixp2000: txcomp channel index " | |
172 | "out of bounds (%d, %.8i, %d)\n", | |
173 | channel, (unsigned int)desc, entry); | |
174 | continue; | |
175 | } | |
176 | ||
177 | ip = netdev_priv(nds[channel]); | |
178 | if (ip->tx_queue_entries == TX_BUF_COUNT_PER_CHAN) | |
179 | wake |= 1 << channel; | |
180 | ip->tx_queue_entries--; | |
181 | } | |
182 | ||
183 | for (channel = 0; wake != 0; channel++) { | |
184 | if (wake & (1 << channel)) { | |
185 | netif_wake_queue(nds[channel]); | |
186 | wake &= ~(1 << channel); | |
187 | } | |
188 | } | |
189 | } | |
190 | ||
191 | static irqreturn_t ixpdev_interrupt(int irq, void *dev_id, struct pt_regs *regs) | |
192 | { | |
193 | u32 status; | |
194 | ||
195 | status = ixp2000_reg_read(IXP2000_IRQ_THD_STATUS_A_0); | |
196 | if (status == 0) | |
197 | return IRQ_NONE; | |
198 | ||
199 | /* | |
200 | * Any of the eight receive units signaled RX? | |
201 | */ | |
202 | if (status & 0x00ff) { | |
203 | ixp2000_reg_wrb(IXP2000_IRQ_THD_ENABLE_CLEAR_A_0, 0x00ff); | |
d359b6ff | 204 | if (likely(__netif_rx_schedule_prep(nds[0]))) { |
15d014d1 LB |
205 | __netif_rx_schedule(nds[0]); |
206 | } else { | |
207 | printk(KERN_CRIT "ixp2000: irq while polling!!\n"); | |
208 | } | |
209 | } | |
210 | ||
211 | /* | |
212 | * Any of the eight transmit units signaled TXdone? | |
213 | */ | |
214 | if (status & 0xff00) { | |
215 | ixp2000_reg_wrb(IXP2000_IRQ_THD_RAW_STATUS_A_0, 0xff00); | |
216 | ixpdev_tx_complete(); | |
217 | } | |
218 | ||
219 | return IRQ_HANDLED; | |
220 | } | |
221 | ||
8ce51d69 LB |
222 | #ifdef CONFIG_NET_POLL_CONTROLLER |
223 | static void ixpdev_poll_controller(struct net_device *dev) | |
224 | { | |
225 | disable_irq(IRQ_IXP2000_THDA0); | |
226 | ixpdev_interrupt(IRQ_IXP2000_THDA0, dev, NULL); | |
227 | enable_irq(IRQ_IXP2000_THDA0); | |
228 | } | |
229 | #endif | |
230 | ||
15d014d1 LB |
231 | static int ixpdev_open(struct net_device *dev) |
232 | { | |
233 | struct ixpdev_priv *ip = netdev_priv(dev); | |
234 | int err; | |
235 | ||
236 | if (!nds_open++) { | |
237 | err = request_irq(IRQ_IXP2000_THDA0, ixpdev_interrupt, | |
1fb9df5d | 238 | IRQF_SHARED, "ixp2000_eth", nds); |
15d014d1 LB |
239 | if (err) { |
240 | nds_open--; | |
241 | return err; | |
242 | } | |
243 | ||
244 | ixp2000_reg_write(IXP2000_IRQ_THD_ENABLE_SET_A_0, 0xffff); | |
245 | } | |
246 | ||
247 | set_port_admin_status(ip->channel, 1); | |
248 | netif_start_queue(dev); | |
249 | ||
250 | return 0; | |
251 | } | |
252 | ||
253 | static int ixpdev_close(struct net_device *dev) | |
254 | { | |
255 | struct ixpdev_priv *ip = netdev_priv(dev); | |
256 | ||
257 | netif_stop_queue(dev); | |
258 | set_port_admin_status(ip->channel, 0); | |
259 | ||
260 | if (!--nds_open) { | |
261 | ixp2000_reg_write(IXP2000_IRQ_THD_ENABLE_CLEAR_A_0, 0xffff); | |
262 | free_irq(IRQ_IXP2000_THDA0, nds); | |
263 | } | |
264 | ||
265 | return 0; | |
266 | } | |
267 | ||
268 | struct net_device *ixpdev_alloc(int channel, int sizeof_priv) | |
269 | { | |
270 | struct net_device *dev; | |
271 | struct ixpdev_priv *ip; | |
272 | ||
273 | dev = alloc_etherdev(sizeof_priv); | |
274 | if (dev == NULL) | |
275 | return NULL; | |
276 | ||
277 | dev->hard_start_xmit = ixpdev_xmit; | |
278 | dev->poll = ixpdev_poll; | |
279 | dev->open = ixpdev_open; | |
280 | dev->stop = ixpdev_close; | |
8ce51d69 LB |
281 | #ifdef CONFIG_NET_POLL_CONTROLLER |
282 | dev->poll_controller = ixpdev_poll_controller; | |
283 | #endif | |
15d014d1 LB |
284 | |
285 | dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM; | |
286 | dev->weight = 64; | |
287 | ||
288 | ip = netdev_priv(dev); | |
289 | ip->channel = channel; | |
290 | ip->tx_queue_entries = 0; | |
291 | ||
292 | return dev; | |
293 | } | |
294 | ||
295 | int ixpdev_init(int __nds_count, struct net_device **__nds, | |
296 | void (*__set_port_admin_status)(int port, int up)) | |
297 | { | |
298 | int i; | |
299 | int err; | |
300 | ||
5d4fe2c1 | 301 | BUILD_BUG_ON(RX_BUF_COUNT > 192 || TX_BUF_COUNT > 192); |
15d014d1 | 302 | |
12747784 LB |
303 | printk(KERN_INFO "IXP2000 MSF ethernet driver %s\n", DRV_MODULE_VERSION); |
304 | ||
15d014d1 LB |
305 | nds_count = __nds_count; |
306 | nds = __nds; | |
307 | set_port_admin_status = __set_port_admin_status; | |
308 | ||
15d014d1 LB |
309 | for (i = 0; i < RX_BUF_COUNT; i++) { |
310 | void *buf; | |
311 | ||
312 | buf = (void *)get_zeroed_page(GFP_KERNEL); | |
313 | if (buf == NULL) { | |
314 | err = -ENOMEM; | |
315 | while (--i >= 0) | |
316 | free_page((unsigned long)phys_to_virt(rx_desc[i].buf_addr)); | |
0c49919a | 317 | goto err_out; |
15d014d1 LB |
318 | } |
319 | rx_desc[i].buf_addr = virt_to_phys(buf); | |
320 | rx_desc[i].buf_length = PAGE_SIZE; | |
321 | } | |
322 | ||
323 | /* @@@ Maybe we shouldn't be preallocating TX buffers. */ | |
324 | for (i = 0; i < TX_BUF_COUNT; i++) { | |
325 | void *buf; | |
326 | ||
327 | buf = (void *)get_zeroed_page(GFP_KERNEL); | |
328 | if (buf == NULL) { | |
329 | err = -ENOMEM; | |
330 | while (--i >= 0) | |
331 | free_page((unsigned long)phys_to_virt(tx_desc[i].buf_addr)); | |
332 | goto err_free_rx; | |
333 | } | |
334 | tx_desc[i].buf_addr = virt_to_phys(buf); | |
335 | } | |
336 | ||
337 | /* 256 entries, ring status set means 'empty', base address 0x0000. */ | |
338 | ixp2000_reg_write(RING_RX_PENDING_BASE, 0x44000000); | |
339 | ixp2000_reg_write(RING_RX_PENDING_HEAD, 0x00000000); | |
340 | ixp2000_reg_write(RING_RX_PENDING_TAIL, 0x00000000); | |
341 | ||
342 | /* 256 entries, ring status set means 'full', base address 0x0400. */ | |
343 | ixp2000_reg_write(RING_RX_DONE_BASE, 0x40000400); | |
344 | ixp2000_reg_write(RING_RX_DONE_HEAD, 0x00000000); | |
345 | ixp2000_reg_write(RING_RX_DONE_TAIL, 0x00000000); | |
346 | ||
347 | for (i = 0; i < RX_BUF_COUNT; i++) { | |
348 | ixp2000_reg_write(RING_RX_PENDING, | |
349 | RX_BUF_DESC_BASE + (i * sizeof(struct ixpdev_rx_desc))); | |
350 | } | |
351 | ||
352 | ixp2000_uengine_load(0, &ixp2400_rx); | |
353 | ixp2000_uengine_start_contexts(0, 0xff); | |
354 | ||
15d014d1 LB |
355 | /* 256 entries, ring status set means 'empty', base address 0x0800. */ |
356 | ixp2000_reg_write(RING_TX_PENDING_BASE, 0x44000800); | |
357 | ixp2000_reg_write(RING_TX_PENDING_HEAD, 0x00000000); | |
358 | ixp2000_reg_write(RING_TX_PENDING_TAIL, 0x00000000); | |
359 | ||
360 | /* 256 entries, ring status set means 'full', base address 0x0c00. */ | |
361 | ixp2000_reg_write(RING_TX_DONE_BASE, 0x40000c00); | |
362 | ixp2000_reg_write(RING_TX_DONE_HEAD, 0x00000000); | |
363 | ixp2000_reg_write(RING_TX_DONE_TAIL, 0x00000000); | |
364 | ||
365 | ixp2000_uengine_load(1, &ixp2400_tx); | |
366 | ixp2000_uengine_start_contexts(1, 0xff); | |
367 | ||
0c49919a LB |
368 | for (i = 0; i < nds_count; i++) { |
369 | err = register_netdev(nds[i]); | |
370 | if (err) { | |
371 | while (--i >= 0) | |
372 | unregister_netdev(nds[i]); | |
373 | goto err_free_tx; | |
374 | } | |
375 | } | |
376 | ||
7ed98bfd LB |
377 | for (i = 0; i < nds_count; i++) { |
378 | printk(KERN_INFO "%s: IXP2000 MSF ethernet (port %d), " | |
379 | "%.2x:%.2x:%.2x:%.2x:%.2x:%.2x.\n", nds[i]->name, i, | |
380 | nds[i]->dev_addr[0], nds[i]->dev_addr[1], | |
381 | nds[i]->dev_addr[2], nds[i]->dev_addr[3], | |
382 | nds[i]->dev_addr[4], nds[i]->dev_addr[5]); | |
383 | } | |
384 | ||
15d014d1 LB |
385 | return 0; |
386 | ||
0c49919a LB |
387 | err_free_tx: |
388 | for (i = 0; i < TX_BUF_COUNT; i++) | |
389 | free_page((unsigned long)phys_to_virt(tx_desc[i].buf_addr)); | |
390 | ||
15d014d1 LB |
391 | err_free_rx: |
392 | for (i = 0; i < RX_BUF_COUNT; i++) | |
393 | free_page((unsigned long)phys_to_virt(rx_desc[i].buf_addr)); | |
394 | ||
15d014d1 LB |
395 | err_out: |
396 | return err; | |
397 | } | |
398 | ||
399 | void ixpdev_deinit(void) | |
400 | { | |
401 | int i; | |
402 | ||
403 | /* @@@ Flush out pending packets. */ | |
404 | ||
0c49919a LB |
405 | for (i = 0; i < nds_count; i++) |
406 | unregister_netdev(nds[i]); | |
407 | ||
15d014d1 LB |
408 | ixp2000_uengine_stop_contexts(1, 0xff); |
409 | ixp2000_uengine_stop_contexts(0, 0xff); | |
410 | ixp2000_uengine_reset(0x3); | |
411 | ||
412 | for (i = 0; i < TX_BUF_COUNT; i++) | |
413 | free_page((unsigned long)phys_to_virt(tx_desc[i].buf_addr)); | |
414 | ||
415 | for (i = 0; i < RX_BUF_COUNT; i++) | |
416 | free_page((unsigned long)phys_to_virt(rx_desc[i].buf_addr)); | |
15d014d1 | 417 | } |