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Save sram context after changing MPU, DSP or core clocks
[linux-ginger.git] / drivers / net / ixp2000 / ixpdev.c
blob9aee0cc922c952191512be96d22433f0ec59b1fd
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
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>
18 #include <asm/hardware/uengine.h>
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 #include "pm3386.h"
25
26 #define DRV_MODULE_VERSION "0.2"
27
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 unsigned long flags;
46
47 if (unlikely(skb->len > PAGE_SIZE)) {
48 /* @@@ Count drops. */
49 dev_kfree_skb(skb);
50 return NETDEV_TX_OK;
51 }
52
53 entry = tx_pointer;
54 tx_pointer = (tx_pointer + 1) % TX_BUF_COUNT;
55
56 desc = tx_desc + entry;
57 desc->pkt_length = skb->len;
58 desc->channel = ip->channel;
59
60 skb_copy_and_csum_dev(skb, phys_to_virt(desc->buf_addr));
61 dev_kfree_skb(skb);
62
63 ixp2000_reg_write(RING_TX_PENDING,
64 TX_BUF_DESC_BASE + (entry * sizeof(struct ixpdev_tx_desc)));
65
66 dev->trans_start = jiffies;
67
68 local_irq_save(flags);
69 ip->tx_queue_entries++;
70 if (ip->tx_queue_entries == TX_BUF_COUNT_PER_CHAN)
71 netif_stop_queue(dev);
72 local_irq_restore(flags);
73
74 return NETDEV_TX_OK;
75 }
76
77
78 static int ixpdev_rx(struct net_device *dev, int processed, int budget)
79 {
80 while (processed < budget) {
81 struct ixpdev_rx_desc *desc;
82 struct sk_buff *skb;
83 void *buf;
84 u32 _desc;
85
86 _desc = ixp2000_reg_read(RING_RX_DONE);
87 if (_desc == 0)
88 return 0;
89
90 desc = rx_desc +
91 ((_desc - RX_BUF_DESC_BASE) / sizeof(struct ixpdev_rx_desc));
92 buf = phys_to_virt(desc->buf_addr);
93
94 if (desc->pkt_length < 4 || desc->pkt_length > PAGE_SIZE) {
95 printk(KERN_ERR "ixp2000: rx err, length %d\n",
96 desc->pkt_length);
97 goto err;
98 }
99
100 if (desc->channel < 0 || desc->channel >= nds_count) {
101 printk(KERN_ERR "ixp2000: rx err, channel %d\n",
102 desc->channel);
103 goto err;
104 }
105
106 /* @@@ Make FCS stripping configurable. */
107 desc->pkt_length -= 4;
108
109 if (unlikely(!netif_running(nds[desc->channel])))
110 goto err;
111
112 skb = netdev_alloc_skb(dev, desc->pkt_length + 2);
113 if (likely(skb != NULL)) {
114 skb_reserve(skb, 2);
115 skb_copy_to_linear_data(skb, buf, desc->pkt_length);
116 skb_put(skb, desc->pkt_length);
117 skb->protocol = eth_type_trans(skb, nds[desc->channel]);
118
119 netif_receive_skb(skb);
120 }
121
122 err:
123 ixp2000_reg_write(RING_RX_PENDING, _desc);
124 processed++;
125 }
126
127 return processed;
128 }
129
130 /* dev always points to nds[0]. */
131 static int ixpdev_poll(struct napi_struct *napi, int budget)
132 {
133 struct ixpdev_priv *ip = container_of(napi, struct ixpdev_priv, napi);
134 struct net_device *dev = ip->dev;
135 int rx;
136
137 rx = 0;
138 do {
139 ixp2000_reg_write(IXP2000_IRQ_THD_RAW_STATUS_A_0, 0x00ff);
140
141 rx = ixpdev_rx(dev, rx, budget);
142 if (rx >= budget)
143 break;
144 } while (ixp2000_reg_read(IXP2000_IRQ_THD_RAW_STATUS_A_0) & 0x00ff);
145
146 napi_complete(napi);
147 ixp2000_reg_write(IXP2000_IRQ_THD_ENABLE_SET_A_0, 0x00ff);
148
149 return rx;
150 }
151
152 static void ixpdev_tx_complete(void)
153 {
154 int channel;
155 u32 wake;
156
157 wake = 0;
158 while (1) {
159 struct ixpdev_priv *ip;
160 u32 desc;
161 int entry;
162
163 desc = ixp2000_reg_read(RING_TX_DONE);
164 if (desc == 0)
165 break;
166
167 /* @@@ Check whether entries come back in order. */
168 entry = (desc - TX_BUF_DESC_BASE) / sizeof(struct ixpdev_tx_desc);
169 channel = tx_desc[entry].channel;
170
171 if (channel < 0 || channel >= nds_count) {
172 printk(KERN_ERR "ixp2000: txcomp channel index "
173 "out of bounds (%d, %.8i, %d)\n",
174 channel, (unsigned int)desc, entry);
175 continue;
176 }
177
178 ip = netdev_priv(nds[channel]);
179 if (ip->tx_queue_entries == TX_BUF_COUNT_PER_CHAN)
180 wake |= 1 << channel;
181 ip->tx_queue_entries--;
182 }
183
184 for (channel = 0; wake != 0; channel++) {
185 if (wake & (1 << channel)) {
186 netif_wake_queue(nds[channel]);
187 wake &= ~(1 << channel);
188 }
189 }
190 }
191
192 static irqreturn_t ixpdev_interrupt(int irq, void *dev_id)
193 {
194 u32 status;
195
196 status = ixp2000_reg_read(IXP2000_IRQ_THD_STATUS_A_0);
197 if (status == 0)
198 return IRQ_NONE;
199
200 /*
201 * Any of the eight receive units signaled RX?
202 */
203 if (status & 0x00ff) {
204 struct net_device *dev = nds[0];
205 struct ixpdev_priv *ip = netdev_priv(dev);
206
207 ixp2000_reg_wrb(IXP2000_IRQ_THD_ENABLE_CLEAR_A_0, 0x00ff);
208 if (likely(napi_schedule_prep(&ip->napi))) {
209 __napi_schedule(&ip->napi);
210 } else {
211 printk(KERN_CRIT "ixp2000: irq while polling!!\n");
212 }
213 }
214
215 /*
216 * Any of the eight transmit units signaled TXdone?
217 */
218 if (status & 0xff00) {
219 ixp2000_reg_wrb(IXP2000_IRQ_THD_RAW_STATUS_A_0, 0xff00);
220 ixpdev_tx_complete();
221 }
222
223 return IRQ_HANDLED;
224 }
225
226 #ifdef CONFIG_NET_POLL_CONTROLLER
227 static void ixpdev_poll_controller(struct net_device *dev)
228 {
229 disable_irq(IRQ_IXP2000_THDA0);
230 ixpdev_interrupt(IRQ_IXP2000_THDA0, dev);
231 enable_irq(IRQ_IXP2000_THDA0);
232 }
233 #endif
234
235 static int ixpdev_open(struct net_device *dev)
236 {
237 struct ixpdev_priv *ip = netdev_priv(dev);
238 int err;
239
240 napi_enable(&ip->napi);
241 if (!nds_open++) {
242 err = request_irq(IRQ_IXP2000_THDA0, ixpdev_interrupt,
243 IRQF_SHARED, "ixp2000_eth", nds);
244 if (err) {
245 nds_open--;
246 napi_disable(&ip->napi);
247 return err;
248 }
249
250 ixp2000_reg_write(IXP2000_IRQ_THD_ENABLE_SET_A_0, 0xffff);
251 }
252
253 set_port_admin_status(ip->channel, 1);
254 netif_start_queue(dev);
255
256 return 0;
257 }
258
259 static int ixpdev_close(struct net_device *dev)
260 {
261 struct ixpdev_priv *ip = netdev_priv(dev);
262
263 netif_stop_queue(dev);
264 napi_disable(&ip->napi);
265 set_port_admin_status(ip->channel, 0);
266
267 if (!--nds_open) {
268 ixp2000_reg_write(IXP2000_IRQ_THD_ENABLE_CLEAR_A_0, 0xffff);
269 free_irq(IRQ_IXP2000_THDA0, nds);
270 }
271
272 return 0;
273 }
274
275 static struct net_device_stats *ixpdev_get_stats(struct net_device *dev)
276 {
277 struct ixpdev_priv *ip = netdev_priv(dev);
278
279 pm3386_get_stats(ip->channel, &(dev->stats));
280
281 return &(dev->stats);
282 }
283
284 static const struct net_device_ops ixpdev_netdev_ops = {
285 .ndo_open = ixpdev_open,
286 .ndo_stop = ixpdev_close,
287 .ndo_start_xmit = ixpdev_xmit,
288 .ndo_change_mtu = eth_change_mtu,
289 .ndo_validate_addr = eth_validate_addr,
290 .ndo_set_mac_address = eth_mac_addr,
291 .ndo_get_stats = ixpdev_get_stats,
292 #ifdef CONFIG_NET_POLL_CONTROLLER
293 .ndo_poll_controller = ixpdev_poll_controller,
294 #endif
295 };
296
297 struct net_device *ixpdev_alloc(int channel, int sizeof_priv)
298 {
299 struct net_device *dev;
300 struct ixpdev_priv *ip;
301
302 dev = alloc_etherdev(sizeof_priv);
303 if (dev == NULL)
304 return NULL;
305
306 dev->netdev_ops = &ixpdev_netdev_ops;
307
308 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
309
310 ip = netdev_priv(dev);
311 ip->dev = dev;
312 netif_napi_add(dev, &ip->napi, ixpdev_poll, 64);
313 ip->channel = channel;
314 ip->tx_queue_entries = 0;
315
316 return dev;
317 }
318
319 int ixpdev_init(int __nds_count, struct net_device **__nds,
320 void (*__set_port_admin_status)(int port, int up))
321 {
322 int i;
323 int err;
324
325 BUILD_BUG_ON(RX_BUF_COUNT > 192 || TX_BUF_COUNT > 192);
326
327 printk(KERN_INFO "IXP2000 MSF ethernet driver %s\n", DRV_MODULE_VERSION);
328
329 nds_count = __nds_count;
330 nds = __nds;
331 set_port_admin_status = __set_port_admin_status;
332
333 for (i = 0; i < RX_BUF_COUNT; i++) {
334 void *buf;
335
336 buf = (void *)get_zeroed_page(GFP_KERNEL);
337 if (buf == NULL) {
338 err = -ENOMEM;
339 while (--i >= 0)
340 free_page((unsigned long)phys_to_virt(rx_desc[i].buf_addr));
341 goto err_out;
342 }
343 rx_desc[i].buf_addr = virt_to_phys(buf);
344 rx_desc[i].buf_length = PAGE_SIZE;
345 }
346
347 /* @@@ Maybe we shouldn't be preallocating TX buffers. */
348 for (i = 0; i < TX_BUF_COUNT; i++) {
349 void *buf;
350
351 buf = (void *)get_zeroed_page(GFP_KERNEL);
352 if (buf == NULL) {
353 err = -ENOMEM;
354 while (--i >= 0)
355 free_page((unsigned long)phys_to_virt(tx_desc[i].buf_addr));
356 goto err_free_rx;
357 }
358 tx_desc[i].buf_addr = virt_to_phys(buf);
359 }
360
361 /* 256 entries, ring status set means 'empty', base address 0x0000. */
362 ixp2000_reg_write(RING_RX_PENDING_BASE, 0x44000000);
363 ixp2000_reg_write(RING_RX_PENDING_HEAD, 0x00000000);
364 ixp2000_reg_write(RING_RX_PENDING_TAIL, 0x00000000);
365
366 /* 256 entries, ring status set means 'full', base address 0x0400. */
367 ixp2000_reg_write(RING_RX_DONE_BASE, 0x40000400);
368 ixp2000_reg_write(RING_RX_DONE_HEAD, 0x00000000);
369 ixp2000_reg_write(RING_RX_DONE_TAIL, 0x00000000);
370
371 for (i = 0; i < RX_BUF_COUNT; i++) {
372 ixp2000_reg_write(RING_RX_PENDING,
373 RX_BUF_DESC_BASE + (i * sizeof(struct ixpdev_rx_desc)));
374 }
375
376 ixp2000_uengine_load(0, &ixp2400_rx);
377 ixp2000_uengine_start_contexts(0, 0xff);
378
379 /* 256 entries, ring status set means 'empty', base address 0x0800. */
380 ixp2000_reg_write(RING_TX_PENDING_BASE, 0x44000800);
381 ixp2000_reg_write(RING_TX_PENDING_HEAD, 0x00000000);
382 ixp2000_reg_write(RING_TX_PENDING_TAIL, 0x00000000);
383
384 /* 256 entries, ring status set means 'full', base address 0x0c00. */
385 ixp2000_reg_write(RING_TX_DONE_BASE, 0x40000c00);
386 ixp2000_reg_write(RING_TX_DONE_HEAD, 0x00000000);
387 ixp2000_reg_write(RING_TX_DONE_TAIL, 0x00000000);
388
389 ixp2000_uengine_load(1, &ixp2400_tx);
390 ixp2000_uengine_start_contexts(1, 0xff);
391
392 for (i = 0; i < nds_count; i++) {
393 err = register_netdev(nds[i]);
394 if (err) {
395 while (--i >= 0)
396 unregister_netdev(nds[i]);
397 goto err_free_tx;
398 }
399 }
400
401 for (i = 0; i < nds_count; i++) {
402 printk(KERN_INFO "%s: IXP2000 MSF ethernet (port %d), "
403 "%.2x:%.2x:%.2x:%.2x:%.2x:%.2x.\n", nds[i]->name, i,
404 nds[i]->dev_addr[0], nds[i]->dev_addr[1],
405 nds[i]->dev_addr[2], nds[i]->dev_addr[3],
406 nds[i]->dev_addr[4], nds[i]->dev_addr[5]);
407 }
408
409 return 0;
410
411 err_free_tx:
412 for (i = 0; i < TX_BUF_COUNT; i++)
413 free_page((unsigned long)phys_to_virt(tx_desc[i].buf_addr));
414
415 err_free_rx:
416 for (i = 0; i < RX_BUF_COUNT; i++)
417 free_page((unsigned long)phys_to_virt(rx_desc[i].buf_addr));
418
419 err_out:
420 return err;
421 }
422
423 void ixpdev_deinit(void)
424 {
425 int i;
426
427 /* @@@ Flush out pending packets. */
428
429 for (i = 0; i < nds_count; i++)
430 unregister_netdev(nds[i]);
431
432 ixp2000_uengine_stop_contexts(1, 0xff);
433 ixp2000_uengine_stop_contexts(0, 0xff);
434 ixp2000_uengine_reset(0x3);
435
436 for (i = 0; i < TX_BUF_COUNT; i++)
437 free_page((unsigned long)phys_to_virt(tx_desc[i].buf_addr));
438
439 for (i = 0; i < RX_BUF_COUNT; i++)
440 free_page((unsigned long)phys_to_virt(rx_desc[i].buf_addr));
441 }
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