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f5cd7872 OJ |
1 | /* |
2 | * Copyright (C) 2006-2007 PA Semi, Inc | |
3 | * | |
4 | * Driver for the PA Semi PWRficient onchip 1G/10G Ethernet MACs | |
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 version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
18 | */ | |
19 | ||
20 | #include <linux/init.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/pci.h> | |
23 | #include <linux/interrupt.h> | |
24 | #include <linux/dmaengine.h> | |
25 | #include <linux/delay.h> | |
26 | #include <linux/netdevice.h> | |
27 | #include <linux/etherdevice.h> | |
28 | #include <asm/dma-mapping.h> | |
29 | #include <linux/in.h> | |
30 | #include <linux/skbuff.h> | |
31 | ||
32 | #include <linux/ip.h> | |
33 | #include <linux/tcp.h> | |
34 | #include <net/checksum.h> | |
35 | ||
36 | #include "pasemi_mac.h" | |
37 | ||
38 | ||
39 | /* TODO list | |
40 | * | |
41 | * - Get rid of pci_{read,write}_config(), map registers with ioremap | |
42 | * for performance | |
43 | * - PHY support | |
44 | * - Multicast support | |
45 | * - Large MTU support | |
46 | * - Other performance improvements | |
47 | */ | |
48 | ||
49 | ||
50 | /* Must be a power of two */ | |
51 | #define RX_RING_SIZE 512 | |
52 | #define TX_RING_SIZE 512 | |
53 | ||
54 | #define TX_DESC(mac, num) ((mac)->tx->desc[(num) & (TX_RING_SIZE-1)]) | |
55 | #define TX_DESC_INFO(mac, num) ((mac)->tx->desc_info[(num) & (TX_RING_SIZE-1)]) | |
56 | #define RX_DESC(mac, num) ((mac)->rx->desc[(num) & (RX_RING_SIZE-1)]) | |
57 | #define RX_DESC_INFO(mac, num) ((mac)->rx->desc_info[(num) & (RX_RING_SIZE-1)]) | |
58 | #define RX_BUFF(mac, num) ((mac)->rx->buffers[(num) & (RX_RING_SIZE-1)]) | |
59 | ||
60 | #define BUF_SIZE 1646 /* 1500 MTU + ETH_HLEN + VLAN_HLEN + 2 64B cachelines */ | |
61 | ||
62 | /* XXXOJN these should come out of the device tree some day */ | |
63 | #define PAS_DMA_CAP_BASE 0xe00d0040 | |
64 | #define PAS_DMA_CAP_SIZE 0x100 | |
65 | #define PAS_DMA_COM_BASE 0xe00d0100 | |
66 | #define PAS_DMA_COM_SIZE 0x100 | |
67 | ||
68 | static struct pasdma_status *dma_status; | |
69 | ||
70 | static int pasemi_get_mac_addr(struct pasemi_mac *mac) | |
71 | { | |
72 | struct pci_dev *pdev = mac->pdev; | |
73 | struct device_node *dn = pci_device_to_OF_node(pdev); | |
74 | const u8 *maddr; | |
75 | u8 addr[6]; | |
76 | ||
77 | if (!dn) { | |
78 | dev_dbg(&pdev->dev, | |
79 | "No device node for mac, not configuring\n"); | |
80 | return -ENOENT; | |
81 | } | |
82 | ||
83 | maddr = get_property(dn, "mac-address", NULL); | |
84 | if (maddr == NULL) { | |
85 | dev_warn(&pdev->dev, | |
86 | "no mac address in device tree, not configuring\n"); | |
87 | return -ENOENT; | |
88 | } | |
89 | ||
90 | if (sscanf(maddr, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", &addr[0], | |
91 | &addr[1], &addr[2], &addr[3], &addr[4], &addr[5]) != 6) { | |
92 | dev_warn(&pdev->dev, | |
93 | "can't parse mac address, not configuring\n"); | |
94 | return -EINVAL; | |
95 | } | |
96 | ||
97 | memcpy(mac->mac_addr, addr, sizeof(addr)); | |
98 | return 0; | |
99 | } | |
100 | ||
101 | static int pasemi_mac_setup_rx_resources(struct net_device *dev) | |
102 | { | |
103 | struct pasemi_mac_rxring *ring; | |
104 | struct pasemi_mac *mac = netdev_priv(dev); | |
105 | int chan_id = mac->dma_rxch; | |
106 | ||
107 | ring = kzalloc(sizeof(*ring), GFP_KERNEL); | |
108 | ||
109 | if (!ring) | |
110 | goto out_ring; | |
111 | ||
112 | spin_lock_init(&ring->lock); | |
113 | ||
114 | ring->desc_info = kzalloc(sizeof(struct pasemi_mac_buffer) * | |
115 | RX_RING_SIZE, GFP_KERNEL); | |
116 | ||
117 | if (!ring->desc_info) | |
118 | goto out_desc_info; | |
119 | ||
120 | /* Allocate descriptors */ | |
121 | ring->desc = dma_alloc_coherent(&mac->dma_pdev->dev, | |
122 | RX_RING_SIZE * | |
123 | sizeof(struct pas_dma_xct_descr), | |
124 | &ring->dma, GFP_KERNEL); | |
125 | ||
126 | if (!ring->desc) | |
127 | goto out_desc; | |
128 | ||
129 | memset(ring->desc, 0, RX_RING_SIZE * sizeof(struct pas_dma_xct_descr)); | |
130 | ||
131 | ring->buffers = dma_alloc_coherent(&mac->dma_pdev->dev, | |
132 | RX_RING_SIZE * sizeof(u64), | |
133 | &ring->buf_dma, GFP_KERNEL); | |
134 | if (!ring->buffers) | |
135 | goto out_buffers; | |
136 | ||
137 | memset(ring->buffers, 0, RX_RING_SIZE * sizeof(u64)); | |
138 | ||
139 | pci_write_config_dword(mac->dma_pdev, PAS_DMA_RXCHAN_BASEL(chan_id), | |
140 | PAS_DMA_RXCHAN_BASEL_BRBL(ring->dma)); | |
141 | ||
142 | pci_write_config_dword(mac->dma_pdev, PAS_DMA_RXCHAN_BASEU(chan_id), | |
143 | PAS_DMA_RXCHAN_BASEU_BRBH(ring->dma >> 32) | | |
144 | PAS_DMA_RXCHAN_BASEU_SIZ(RX_RING_SIZE >> 2)); | |
145 | ||
146 | pci_write_config_dword(mac->dma_pdev, PAS_DMA_RXCHAN_CFG(chan_id), | |
147 | PAS_DMA_RXCHAN_CFG_HBU(1)); | |
148 | ||
149 | pci_write_config_dword(mac->dma_pdev, PAS_DMA_RXINT_BASEL(mac->dma_if), | |
150 | PAS_DMA_RXINT_BASEL_BRBL(__pa(ring->buffers))); | |
151 | ||
152 | pci_write_config_dword(mac->dma_pdev, PAS_DMA_RXINT_BASEU(mac->dma_if), | |
153 | PAS_DMA_RXINT_BASEU_BRBH(__pa(ring->buffers) >> 32) | | |
154 | PAS_DMA_RXINT_BASEU_SIZ(RX_RING_SIZE >> 3)); | |
155 | ||
156 | ring->next_to_fill = 0; | |
157 | ring->next_to_clean = 0; | |
158 | ||
159 | snprintf(ring->irq_name, sizeof(ring->irq_name), | |
160 | "%s rx", dev->name); | |
161 | mac->rx = ring; | |
162 | ||
163 | return 0; | |
164 | ||
165 | out_buffers: | |
166 | dma_free_coherent(&mac->dma_pdev->dev, | |
167 | RX_RING_SIZE * sizeof(struct pas_dma_xct_descr), | |
168 | mac->rx->desc, mac->rx->dma); | |
169 | out_desc: | |
170 | kfree(ring->desc_info); | |
171 | out_desc_info: | |
172 | kfree(ring); | |
173 | out_ring: | |
174 | return -ENOMEM; | |
175 | } | |
176 | ||
177 | ||
178 | static int pasemi_mac_setup_tx_resources(struct net_device *dev) | |
179 | { | |
180 | struct pasemi_mac *mac = netdev_priv(dev); | |
181 | u32 val; | |
182 | int chan_id = mac->dma_txch; | |
183 | struct pasemi_mac_txring *ring; | |
184 | ||
185 | ring = kzalloc(sizeof(*ring), GFP_KERNEL); | |
186 | if (!ring) | |
187 | goto out_ring; | |
188 | ||
189 | spin_lock_init(&ring->lock); | |
190 | ||
191 | ring->desc_info = kzalloc(sizeof(struct pasemi_mac_buffer) * | |
192 | TX_RING_SIZE, GFP_KERNEL); | |
193 | if (!ring->desc_info) | |
194 | goto out_desc_info; | |
195 | ||
196 | /* Allocate descriptors */ | |
197 | ring->desc = dma_alloc_coherent(&mac->dma_pdev->dev, | |
198 | TX_RING_SIZE * | |
199 | sizeof(struct pas_dma_xct_descr), | |
200 | &ring->dma, GFP_KERNEL); | |
201 | if (!ring->desc) | |
202 | goto out_desc; | |
203 | ||
204 | memset(ring->desc, 0, TX_RING_SIZE * sizeof(struct pas_dma_xct_descr)); | |
205 | ||
206 | pci_write_config_dword(mac->dma_pdev, PAS_DMA_TXCHAN_BASEL(chan_id), | |
207 | PAS_DMA_TXCHAN_BASEL_BRBL(ring->dma)); | |
208 | val = PAS_DMA_TXCHAN_BASEU_BRBH(ring->dma >> 32); | |
209 | val |= PAS_DMA_TXCHAN_BASEU_SIZ(TX_RING_SIZE >> 2); | |
210 | ||
211 | pci_write_config_dword(mac->dma_pdev, PAS_DMA_TXCHAN_BASEU(chan_id), val); | |
212 | ||
213 | pci_write_config_dword(mac->dma_pdev, PAS_DMA_TXCHAN_CFG(chan_id), | |
214 | PAS_DMA_TXCHAN_CFG_TY_IFACE | | |
215 | PAS_DMA_TXCHAN_CFG_TATTR(mac->dma_if) | | |
216 | PAS_DMA_TXCHAN_CFG_UP | | |
217 | PAS_DMA_TXCHAN_CFG_WT(2)); | |
218 | ||
219 | ring->next_to_use = 0; | |
220 | ring->next_to_clean = 0; | |
221 | ||
222 | snprintf(ring->irq_name, sizeof(ring->irq_name), | |
223 | "%s tx", dev->name); | |
224 | mac->tx = ring; | |
225 | ||
226 | return 0; | |
227 | ||
228 | out_desc: | |
229 | kfree(ring->desc_info); | |
230 | out_desc_info: | |
231 | kfree(ring); | |
232 | out_ring: | |
233 | return -ENOMEM; | |
234 | } | |
235 | ||
236 | static void pasemi_mac_free_tx_resources(struct net_device *dev) | |
237 | { | |
238 | struct pasemi_mac *mac = netdev_priv(dev); | |
239 | unsigned int i; | |
240 | struct pasemi_mac_buffer *info; | |
241 | struct pas_dma_xct_descr *dp; | |
242 | ||
243 | for (i = 0; i < TX_RING_SIZE; i++) { | |
244 | info = &TX_DESC_INFO(mac, i); | |
245 | dp = &TX_DESC(mac, i); | |
246 | if (info->dma) { | |
247 | if (info->skb) { | |
248 | pci_unmap_single(mac->dma_pdev, | |
249 | info->dma, | |
250 | info->skb->len, | |
251 | PCI_DMA_TODEVICE); | |
252 | dev_kfree_skb_any(info->skb); | |
253 | } | |
254 | info->dma = 0; | |
255 | info->skb = NULL; | |
256 | dp->mactx = 0; | |
257 | dp->ptr = 0; | |
258 | } | |
259 | } | |
260 | ||
261 | dma_free_coherent(&mac->dma_pdev->dev, | |
262 | TX_RING_SIZE * sizeof(struct pas_dma_xct_descr), | |
263 | mac->tx->desc, mac->tx->dma); | |
264 | ||
265 | kfree(mac->tx->desc_info); | |
266 | kfree(mac->tx); | |
267 | mac->tx = NULL; | |
268 | } | |
269 | ||
270 | static void pasemi_mac_free_rx_resources(struct net_device *dev) | |
271 | { | |
272 | struct pasemi_mac *mac = netdev_priv(dev); | |
273 | unsigned int i; | |
274 | struct pasemi_mac_buffer *info; | |
275 | struct pas_dma_xct_descr *dp; | |
276 | ||
277 | for (i = 0; i < RX_RING_SIZE; i++) { | |
278 | info = &RX_DESC_INFO(mac, i); | |
279 | dp = &RX_DESC(mac, i); | |
280 | if (info->dma) { | |
281 | if (info->skb) { | |
282 | pci_unmap_single(mac->dma_pdev, | |
283 | info->dma, | |
284 | info->skb->len, | |
285 | PCI_DMA_FROMDEVICE); | |
286 | dev_kfree_skb_any(info->skb); | |
287 | } | |
288 | info->dma = 0; | |
289 | info->skb = NULL; | |
290 | dp->macrx = 0; | |
291 | dp->ptr = 0; | |
292 | } | |
293 | } | |
294 | ||
295 | dma_free_coherent(&mac->dma_pdev->dev, | |
296 | RX_RING_SIZE * sizeof(struct pas_dma_xct_descr), | |
297 | mac->rx->desc, mac->rx->dma); | |
298 | ||
299 | dma_free_coherent(&mac->dma_pdev->dev, RX_RING_SIZE * sizeof(u64), | |
300 | mac->rx->buffers, mac->rx->buf_dma); | |
301 | ||
302 | kfree(mac->rx->desc_info); | |
303 | kfree(mac->rx); | |
304 | mac->rx = NULL; | |
305 | } | |
306 | ||
307 | static void pasemi_mac_replenish_rx_ring(struct net_device *dev) | |
308 | { | |
309 | struct pasemi_mac *mac = netdev_priv(dev); | |
310 | unsigned int i; | |
311 | int start = mac->rx->next_to_fill; | |
312 | unsigned int count; | |
313 | ||
314 | count = (mac->rx->next_to_clean + RX_RING_SIZE - | |
315 | mac->rx->next_to_fill) & (RX_RING_SIZE - 1); | |
316 | ||
317 | /* Check to see if we're doing first-time setup */ | |
318 | if (unlikely(mac->rx->next_to_clean == 0 && mac->rx->next_to_fill == 0)) | |
319 | count = RX_RING_SIZE; | |
320 | ||
321 | if (count <= 0) | |
322 | return; | |
323 | ||
324 | for (i = start; i < start + count; i++) { | |
325 | struct pasemi_mac_buffer *info = &RX_DESC_INFO(mac, i); | |
326 | u64 *buff = &RX_BUFF(mac, i); | |
327 | struct sk_buff *skb; | |
328 | dma_addr_t dma; | |
329 | ||
330 | skb = dev_alloc_skb(BUF_SIZE); | |
331 | ||
332 | if (!skb) { | |
333 | count = i - start; | |
334 | break; | |
335 | } | |
336 | ||
f5cd7872 OJ |
337 | dma = pci_map_single(mac->dma_pdev, skb->data, skb->len, |
338 | PCI_DMA_FROMDEVICE); | |
339 | ||
340 | if (dma_mapping_error(dma)) { | |
341 | dev_kfree_skb_irq(info->skb); | |
342 | count = i - start; | |
343 | break; | |
344 | } | |
345 | ||
346 | info->skb = skb; | |
347 | info->dma = dma; | |
348 | *buff = XCT_RXB_LEN(BUF_SIZE) | XCT_RXB_ADDR(dma); | |
349 | } | |
350 | ||
351 | wmb(); | |
352 | ||
353 | pci_write_config_dword(mac->dma_pdev, | |
354 | PAS_DMA_RXCHAN_INCR(mac->dma_rxch), | |
355 | count); | |
356 | pci_write_config_dword(mac->dma_pdev, | |
357 | PAS_DMA_RXINT_INCR(mac->dma_if), | |
358 | count); | |
359 | ||
360 | mac->rx->next_to_fill += count; | |
361 | } | |
362 | ||
363 | static int pasemi_mac_clean_rx(struct pasemi_mac *mac, int limit) | |
364 | { | |
365 | unsigned int i; | |
366 | int start, count; | |
367 | ||
368 | spin_lock(&mac->rx->lock); | |
369 | ||
370 | start = mac->rx->next_to_clean; | |
371 | count = 0; | |
372 | ||
373 | for (i = start; i < (start + RX_RING_SIZE) && count < limit; i++) { | |
374 | struct pas_dma_xct_descr *dp; | |
375 | struct pasemi_mac_buffer *info; | |
376 | struct sk_buff *skb; | |
377 | unsigned int j, len; | |
378 | dma_addr_t dma; | |
379 | ||
380 | rmb(); | |
381 | ||
382 | dp = &RX_DESC(mac, i); | |
383 | ||
384 | if (!(dp->macrx & XCT_MACRX_O)) | |
385 | break; | |
386 | ||
387 | count++; | |
388 | ||
389 | info = NULL; | |
390 | ||
391 | /* We have to scan for our skb since there's no way | |
392 | * to back-map them from the descriptor, and if we | |
393 | * have several receive channels then they might not | |
394 | * show up in the same order as they were put on the | |
395 | * interface ring. | |
396 | */ | |
397 | ||
398 | dma = (dp->ptr & XCT_PTR_ADDR_M); | |
399 | for (j = start; j < (start + RX_RING_SIZE); j++) { | |
400 | info = &RX_DESC_INFO(mac, j); | |
401 | if (info->dma == dma) | |
402 | break; | |
403 | } | |
404 | ||
405 | BUG_ON(!info); | |
406 | BUG_ON(info->dma != dma); | |
407 | ||
408 | pci_unmap_single(mac->dma_pdev, info->dma, info->skb->len, | |
409 | PCI_DMA_FROMDEVICE); | |
410 | ||
411 | skb = info->skb; | |
412 | ||
413 | len = (dp->macrx & XCT_MACRX_LLEN_M) >> XCT_MACRX_LLEN_S; | |
414 | ||
415 | skb_put(skb, len); | |
416 | ||
417 | skb->protocol = eth_type_trans(skb, mac->netdev); | |
418 | ||
419 | if ((dp->macrx & XCT_MACRX_HTY_M) == XCT_MACRX_HTY_IPV4_OK) { | |
420 | skb->ip_summed = CHECKSUM_COMPLETE; | |
421 | skb->csum = (dp->macrx & XCT_MACRX_CSUM_M) >> | |
422 | XCT_MACRX_CSUM_S; | |
423 | } else | |
424 | skb->ip_summed = CHECKSUM_NONE; | |
425 | ||
426 | mac->stats.rx_bytes += len; | |
427 | mac->stats.rx_packets++; | |
428 | ||
429 | netif_receive_skb(skb); | |
430 | ||
431 | info->dma = 0; | |
432 | info->skb = NULL; | |
433 | dp->ptr = 0; | |
434 | dp->macrx = 0; | |
435 | } | |
436 | ||
437 | mac->rx->next_to_clean += count; | |
438 | pasemi_mac_replenish_rx_ring(mac->netdev); | |
439 | ||
440 | spin_unlock(&mac->rx->lock); | |
441 | ||
442 | return count; | |
443 | } | |
444 | ||
445 | static int pasemi_mac_clean_tx(struct pasemi_mac *mac) | |
446 | { | |
447 | int i; | |
448 | struct pasemi_mac_buffer *info; | |
449 | struct pas_dma_xct_descr *dp; | |
450 | int start, count; | |
451 | int flags; | |
452 | ||
453 | spin_lock_irqsave(&mac->tx->lock, flags); | |
454 | ||
455 | start = mac->tx->next_to_clean; | |
456 | count = 0; | |
457 | ||
458 | for (i = start; i < mac->tx->next_to_use; i++) { | |
459 | dp = &TX_DESC(mac, i); | |
460 | if (!dp || (dp->mactx & XCT_MACTX_O)) | |
461 | break; | |
462 | ||
463 | count++; | |
464 | ||
465 | info = &TX_DESC_INFO(mac, i); | |
466 | ||
467 | pci_unmap_single(mac->dma_pdev, info->dma, | |
468 | info->skb->len, PCI_DMA_TODEVICE); | |
469 | dev_kfree_skb_irq(info->skb); | |
470 | ||
471 | info->skb = NULL; | |
472 | info->dma = 0; | |
473 | dp->mactx = 0; | |
474 | dp->ptr = 0; | |
475 | } | |
476 | mac->tx->next_to_clean += count; | |
477 | spin_unlock_irqrestore(&mac->tx->lock, flags); | |
478 | ||
479 | return count; | |
480 | } | |
481 | ||
482 | ||
483 | static irqreturn_t pasemi_mac_rx_intr(int irq, void *data) | |
484 | { | |
485 | struct net_device *dev = data; | |
486 | struct pasemi_mac *mac = netdev_priv(dev); | |
487 | unsigned int reg; | |
488 | ||
489 | if (!(*mac->rx_status & PAS_STATUS_INT)) | |
490 | return IRQ_NONE; | |
491 | ||
492 | netif_rx_schedule(dev); | |
493 | pci_write_config_dword(mac->iob_pdev, PAS_IOB_DMA_COM_TIMEOUTCFG, | |
494 | PAS_IOB_DMA_COM_TIMEOUTCFG_TCNT(0)); | |
495 | ||
496 | reg = PAS_IOB_DMA_RXCH_RESET_PINTC | PAS_IOB_DMA_RXCH_RESET_SINTC | | |
497 | PAS_IOB_DMA_RXCH_RESET_DINTC; | |
498 | if (*mac->rx_status & PAS_STATUS_TIMER) | |
499 | reg |= PAS_IOB_DMA_RXCH_RESET_TINTC; | |
500 | ||
501 | pci_write_config_dword(mac->iob_pdev, | |
502 | PAS_IOB_DMA_RXCH_RESET(mac->dma_rxch), reg); | |
503 | ||
504 | ||
505 | return IRQ_HANDLED; | |
506 | } | |
507 | ||
508 | static irqreturn_t pasemi_mac_tx_intr(int irq, void *data) | |
509 | { | |
510 | struct net_device *dev = data; | |
511 | struct pasemi_mac *mac = netdev_priv(dev); | |
512 | unsigned int reg; | |
513 | int was_full; | |
514 | ||
515 | was_full = mac->tx->next_to_clean - mac->tx->next_to_use == TX_RING_SIZE; | |
516 | ||
517 | if (!(*mac->tx_status & PAS_STATUS_INT)) | |
518 | return IRQ_NONE; | |
519 | ||
520 | pasemi_mac_clean_tx(mac); | |
521 | ||
522 | reg = PAS_IOB_DMA_TXCH_RESET_PINTC | PAS_IOB_DMA_TXCH_RESET_SINTC; | |
523 | if (*mac->tx_status & PAS_STATUS_TIMER) | |
524 | reg |= PAS_IOB_DMA_TXCH_RESET_TINTC; | |
525 | ||
526 | pci_write_config_dword(mac->iob_pdev, PAS_IOB_DMA_TXCH_RESET(mac->dma_txch), | |
527 | reg); | |
528 | ||
529 | if (was_full) | |
530 | netif_wake_queue(dev); | |
531 | ||
532 | return IRQ_HANDLED; | |
533 | } | |
534 | ||
535 | static int pasemi_mac_open(struct net_device *dev) | |
536 | { | |
537 | struct pasemi_mac *mac = netdev_priv(dev); | |
538 | unsigned int flags; | |
539 | int ret; | |
540 | ||
541 | /* enable rx section */ | |
542 | pci_write_config_dword(mac->dma_pdev, PAS_DMA_COM_RXCMD, | |
543 | PAS_DMA_COM_RXCMD_EN); | |
544 | ||
545 | /* enable tx section */ | |
546 | pci_write_config_dword(mac->dma_pdev, PAS_DMA_COM_TXCMD, | |
547 | PAS_DMA_COM_TXCMD_EN); | |
548 | ||
549 | flags = PAS_MAC_CFG_TXP_FCE | PAS_MAC_CFG_TXP_FPC(3) | | |
550 | PAS_MAC_CFG_TXP_SL(3) | PAS_MAC_CFG_TXP_COB(0xf) | | |
551 | PAS_MAC_CFG_TXP_TIFT(8) | PAS_MAC_CFG_TXP_TIFG(12); | |
552 | ||
553 | pci_write_config_dword(mac->pdev, PAS_MAC_CFG_TXP, flags); | |
554 | ||
555 | flags = PAS_MAC_CFG_PCFG_S1 | PAS_MAC_CFG_PCFG_PE | | |
556 | PAS_MAC_CFG_PCFG_PR | PAS_MAC_CFG_PCFG_CE; | |
557 | ||
558 | flags |= PAS_MAC_CFG_PCFG_TSR_1G | PAS_MAC_CFG_PCFG_SPD_1G; | |
559 | ||
560 | pci_write_config_dword(mac->iob_pdev, PAS_IOB_DMA_RXCH_CFG(mac->dma_rxch), | |
561 | PAS_IOB_DMA_RXCH_CFG_CNTTH(30)); | |
562 | ||
563 | pci_write_config_dword(mac->iob_pdev, PAS_IOB_DMA_COM_TIMEOUTCFG, | |
564 | PAS_IOB_DMA_COM_TIMEOUTCFG_TCNT(1000000)); | |
565 | ||
566 | pci_write_config_dword(mac->pdev, PAS_MAC_CFG_PCFG, flags); | |
567 | ||
568 | ret = pasemi_mac_setup_rx_resources(dev); | |
569 | if (ret) | |
570 | goto out_rx_resources; | |
571 | ||
572 | ret = pasemi_mac_setup_tx_resources(dev); | |
573 | if (ret) | |
574 | goto out_tx_resources; | |
575 | ||
576 | pci_write_config_dword(mac->pdev, PAS_MAC_IPC_CHNL, | |
577 | PAS_MAC_IPC_CHNL_DCHNO(mac->dma_rxch) | | |
578 | PAS_MAC_IPC_CHNL_BCH(mac->dma_rxch)); | |
579 | ||
580 | /* enable rx if */ | |
581 | pci_write_config_dword(mac->dma_pdev, | |
582 | PAS_DMA_RXINT_RCMDSTA(mac->dma_if), | |
583 | PAS_DMA_RXINT_RCMDSTA_EN); | |
584 | ||
585 | /* enable rx channel */ | |
586 | pci_write_config_dword(mac->dma_pdev, | |
587 | PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch), | |
588 | PAS_DMA_RXCHAN_CCMDSTA_EN | | |
589 | PAS_DMA_RXCHAN_CCMDSTA_DU); | |
590 | ||
591 | /* enable tx channel */ | |
592 | pci_write_config_dword(mac->dma_pdev, | |
593 | PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch), | |
594 | PAS_DMA_TXCHAN_TCMDSTA_EN); | |
595 | ||
596 | pasemi_mac_replenish_rx_ring(dev); | |
597 | ||
598 | netif_start_queue(dev); | |
599 | netif_poll_enable(dev); | |
600 | ||
601 | ret = request_irq(mac->dma_pdev->irq + mac->dma_txch, | |
602 | &pasemi_mac_tx_intr, IRQF_DISABLED, | |
603 | mac->tx->irq_name, dev); | |
604 | if (ret) { | |
605 | dev_err(&mac->pdev->dev, "request_irq of irq %d failed: %d\n", | |
606 | mac->dma_pdev->irq + mac->dma_txch, ret); | |
607 | goto out_tx_int; | |
608 | } | |
609 | ||
610 | ret = request_irq(mac->dma_pdev->irq + 20 + mac->dma_rxch, | |
611 | &pasemi_mac_rx_intr, IRQF_DISABLED, | |
612 | mac->rx->irq_name, dev); | |
613 | if (ret) { | |
614 | dev_err(&mac->pdev->dev, "request_irq of irq %d failed: %d\n", | |
615 | mac->dma_pdev->irq + 20 + mac->dma_rxch, ret); | |
616 | goto out_rx_int; | |
617 | } | |
618 | ||
619 | return 0; | |
620 | ||
621 | out_rx_int: | |
622 | free_irq(mac->dma_pdev->irq + mac->dma_txch, dev); | |
623 | out_tx_int: | |
624 | netif_poll_disable(dev); | |
625 | netif_stop_queue(dev); | |
626 | pasemi_mac_free_tx_resources(dev); | |
627 | out_tx_resources: | |
628 | pasemi_mac_free_rx_resources(dev); | |
629 | out_rx_resources: | |
630 | ||
631 | return ret; | |
632 | } | |
633 | ||
634 | #define MAX_RETRIES 5000 | |
635 | ||
636 | static int pasemi_mac_close(struct net_device *dev) | |
637 | { | |
638 | struct pasemi_mac *mac = netdev_priv(dev); | |
639 | unsigned int stat; | |
640 | int retries; | |
641 | ||
642 | netif_stop_queue(dev); | |
643 | ||
644 | /* Clean out any pending buffers */ | |
645 | pasemi_mac_clean_tx(mac); | |
646 | pasemi_mac_clean_rx(mac, RX_RING_SIZE); | |
647 | ||
648 | /* Disable interface */ | |
649 | pci_write_config_dword(mac->dma_pdev, | |
650 | PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch), | |
651 | PAS_DMA_TXCHAN_TCMDSTA_ST); | |
652 | pci_write_config_dword(mac->dma_pdev, | |
653 | PAS_DMA_RXINT_RCMDSTA(mac->dma_if), | |
654 | PAS_DMA_RXINT_RCMDSTA_ST); | |
655 | pci_write_config_dword(mac->dma_pdev, | |
656 | PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch), | |
657 | PAS_DMA_RXCHAN_CCMDSTA_ST); | |
658 | ||
659 | for (retries = 0; retries < MAX_RETRIES; retries++) { | |
660 | pci_read_config_dword(mac->dma_pdev, | |
661 | PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch), | |
662 | &stat); | |
663 | if (stat & PAS_DMA_TXCHAN_TCMDSTA_ACT) | |
664 | break; | |
665 | cond_resched(); | |
666 | } | |
667 | ||
668 | if (!(stat & PAS_DMA_TXCHAN_TCMDSTA_ACT)) { | |
669 | dev_err(&mac->dma_pdev->dev, "Failed to stop tx channel\n"); | |
670 | } | |
671 | ||
672 | for (retries = 0; retries < MAX_RETRIES; retries++) { | |
673 | pci_read_config_dword(mac->dma_pdev, | |
674 | PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch), | |
675 | &stat); | |
676 | if (stat & PAS_DMA_RXCHAN_CCMDSTA_ACT) | |
677 | break; | |
678 | cond_resched(); | |
679 | } | |
680 | ||
681 | if (!(stat & PAS_DMA_RXCHAN_CCMDSTA_ACT)) { | |
682 | dev_err(&mac->dma_pdev->dev, "Failed to stop rx channel\n"); | |
683 | } | |
684 | ||
685 | for (retries = 0; retries < MAX_RETRIES; retries++) { | |
686 | pci_read_config_dword(mac->dma_pdev, | |
687 | PAS_DMA_RXINT_RCMDSTA(mac->dma_if), | |
688 | &stat); | |
689 | if (stat & PAS_DMA_RXINT_RCMDSTA_ACT) | |
690 | break; | |
691 | cond_resched(); | |
692 | } | |
693 | ||
694 | if (!(stat & PAS_DMA_RXINT_RCMDSTA_ACT)) { | |
695 | dev_err(&mac->dma_pdev->dev, "Failed to stop rx interface\n"); | |
696 | } | |
697 | ||
698 | /* Then, disable the channel. This must be done separately from | |
699 | * stopping, since you can't disable when active. | |
700 | */ | |
701 | ||
702 | pci_write_config_dword(mac->dma_pdev, | |
703 | PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch), 0); | |
704 | pci_write_config_dword(mac->dma_pdev, | |
705 | PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch), 0); | |
706 | pci_write_config_dword(mac->dma_pdev, | |
707 | PAS_DMA_RXINT_RCMDSTA(mac->dma_if), 0); | |
708 | ||
709 | free_irq(mac->dma_pdev->irq + mac->dma_txch, dev); | |
710 | free_irq(mac->dma_pdev->irq + 20 + mac->dma_rxch, dev); | |
711 | ||
712 | /* Free resources */ | |
713 | pasemi_mac_free_rx_resources(dev); | |
714 | pasemi_mac_free_tx_resources(dev); | |
715 | ||
716 | return 0; | |
717 | } | |
718 | ||
719 | static int pasemi_mac_start_tx(struct sk_buff *skb, struct net_device *dev) | |
720 | { | |
721 | struct pasemi_mac *mac = netdev_priv(dev); | |
722 | struct pasemi_mac_txring *txring; | |
723 | struct pasemi_mac_buffer *info; | |
724 | struct pas_dma_xct_descr *dp; | |
725 | u64 dflags; | |
726 | dma_addr_t map; | |
727 | int flags; | |
728 | ||
729 | dflags = XCT_MACTX_O | XCT_MACTX_ST | XCT_MACTX_SS | XCT_MACTX_CRC_PAD; | |
730 | ||
731 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
d56f90a7 ACM |
732 | const unsigned char *nh = skb_network_header(skb); |
733 | ||
eddc9ec5 | 734 | switch (ip_hdr(skb)->protocol) { |
f5cd7872 OJ |
735 | case IPPROTO_TCP: |
736 | dflags |= XCT_MACTX_CSUM_TCP; | |
737 | dflags |= XCT_MACTX_IPH((skb->h.raw - skb->nh.raw) >> 2); | |
d56f90a7 | 738 | dflags |= XCT_MACTX_IPO(nh - skb->data); |
f5cd7872 OJ |
739 | break; |
740 | case IPPROTO_UDP: | |
741 | dflags |= XCT_MACTX_CSUM_UDP; | |
742 | dflags |= XCT_MACTX_IPH((skb->h.raw - skb->nh.raw) >> 2); | |
d56f90a7 | 743 | dflags |= XCT_MACTX_IPO(nh - skb->data); |
f5cd7872 OJ |
744 | break; |
745 | } | |
746 | } | |
747 | ||
748 | map = pci_map_single(mac->dma_pdev, skb->data, skb->len, PCI_DMA_TODEVICE); | |
749 | ||
750 | if (dma_mapping_error(map)) | |
751 | return NETDEV_TX_BUSY; | |
752 | ||
753 | txring = mac->tx; | |
754 | ||
755 | spin_lock_irqsave(&txring->lock, flags); | |
756 | ||
757 | if (txring->next_to_clean - txring->next_to_use == TX_RING_SIZE) { | |
758 | spin_unlock_irqrestore(&txring->lock, flags); | |
759 | pasemi_mac_clean_tx(mac); | |
760 | spin_lock_irqsave(&txring->lock, flags); | |
761 | ||
762 | if (txring->next_to_clean - txring->next_to_use == | |
763 | TX_RING_SIZE) { | |
764 | /* Still no room -- stop the queue and wait for tx | |
765 | * intr when there's room. | |
766 | */ | |
767 | netif_stop_queue(dev); | |
768 | goto out_err; | |
769 | } | |
770 | } | |
771 | ||
772 | ||
773 | dp = &TX_DESC(mac, txring->next_to_use); | |
774 | info = &TX_DESC_INFO(mac, txring->next_to_use); | |
775 | ||
776 | dp->mactx = dflags | XCT_MACTX_LLEN(skb->len); | |
777 | dp->ptr = XCT_PTR_LEN(skb->len) | XCT_PTR_ADDR(map); | |
778 | info->dma = map; | |
779 | info->skb = skb; | |
780 | ||
781 | txring->next_to_use++; | |
782 | mac->stats.tx_packets++; | |
783 | mac->stats.tx_bytes += skb->len; | |
784 | ||
785 | spin_unlock_irqrestore(&txring->lock, flags); | |
786 | ||
787 | pci_write_config_dword(mac->dma_pdev, | |
788 | PAS_DMA_TXCHAN_INCR(mac->dma_txch), 1); | |
789 | ||
790 | return NETDEV_TX_OK; | |
791 | ||
792 | out_err: | |
793 | spin_unlock_irqrestore(&txring->lock, flags); | |
794 | pci_unmap_single(mac->dma_pdev, map, skb->len, PCI_DMA_TODEVICE); | |
795 | return NETDEV_TX_BUSY; | |
796 | } | |
797 | ||
798 | static struct net_device_stats *pasemi_mac_get_stats(struct net_device *dev) | |
799 | { | |
800 | struct pasemi_mac *mac = netdev_priv(dev); | |
801 | ||
802 | return &mac->stats; | |
803 | } | |
804 | ||
805 | static void pasemi_mac_set_rx_mode(struct net_device *dev) | |
806 | { | |
807 | struct pasemi_mac *mac = netdev_priv(dev); | |
808 | unsigned int flags; | |
809 | ||
810 | pci_read_config_dword(mac->pdev, PAS_MAC_CFG_PCFG, &flags); | |
811 | ||
812 | /* Set promiscuous */ | |
813 | if (dev->flags & IFF_PROMISC) | |
814 | flags |= PAS_MAC_CFG_PCFG_PR; | |
815 | else | |
816 | flags &= ~PAS_MAC_CFG_PCFG_PR; | |
817 | ||
818 | pci_write_config_dword(mac->pdev, PAS_MAC_CFG_PCFG, flags); | |
819 | } | |
820 | ||
821 | ||
822 | static int pasemi_mac_poll(struct net_device *dev, int *budget) | |
823 | { | |
824 | int pkts, limit = min(*budget, dev->quota); | |
825 | struct pasemi_mac *mac = netdev_priv(dev); | |
826 | ||
827 | pkts = pasemi_mac_clean_rx(mac, limit); | |
828 | ||
829 | if (pkts < limit) { | |
830 | /* all done, no more packets present */ | |
831 | netif_rx_complete(dev); | |
832 | ||
833 | /* re-enable receive interrupts */ | |
834 | pci_write_config_dword(mac->iob_pdev, PAS_IOB_DMA_COM_TIMEOUTCFG, | |
835 | PAS_IOB_DMA_COM_TIMEOUTCFG_TCNT(1000000)); | |
836 | return 0; | |
837 | } else { | |
838 | /* used up our quantum, so reschedule */ | |
839 | dev->quota -= pkts; | |
840 | *budget -= pkts; | |
841 | return 1; | |
842 | } | |
843 | } | |
844 | ||
845 | static int __devinit | |
846 | pasemi_mac_probe(struct pci_dev *pdev, const struct pci_device_id *ent) | |
847 | { | |
848 | static int index = 0; | |
849 | struct net_device *dev; | |
850 | struct pasemi_mac *mac; | |
851 | int err; | |
852 | ||
853 | err = pci_enable_device(pdev); | |
854 | if (err) | |
855 | return err; | |
856 | ||
857 | dev = alloc_etherdev(sizeof(struct pasemi_mac)); | |
858 | if (dev == NULL) { | |
859 | dev_err(&pdev->dev, | |
860 | "pasemi_mac: Could not allocate ethernet device.\n"); | |
861 | err = -ENOMEM; | |
862 | goto out_disable_device; | |
863 | } | |
864 | ||
865 | SET_MODULE_OWNER(dev); | |
866 | pci_set_drvdata(pdev, dev); | |
867 | SET_NETDEV_DEV(dev, &pdev->dev); | |
868 | ||
869 | mac = netdev_priv(dev); | |
870 | ||
871 | mac->pdev = pdev; | |
872 | mac->netdev = dev; | |
873 | mac->dma_pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa007, NULL); | |
874 | ||
875 | if (!mac->dma_pdev) { | |
876 | dev_err(&pdev->dev, "Can't find DMA Controller\n"); | |
877 | err = -ENODEV; | |
878 | goto out_free_netdev; | |
879 | } | |
880 | ||
881 | mac->iob_pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa001, NULL); | |
882 | ||
883 | if (!mac->iob_pdev) { | |
884 | dev_err(&pdev->dev, "Can't find I/O Bridge\n"); | |
885 | err = -ENODEV; | |
886 | goto out_put_dma_pdev; | |
887 | } | |
888 | ||
889 | /* These should come out of the device tree eventually */ | |
890 | mac->dma_txch = index; | |
891 | mac->dma_rxch = index; | |
892 | ||
893 | /* We probe GMAC before XAUI, but the DMA interfaces are | |
894 | * in XAUI, GMAC order. | |
895 | */ | |
896 | if (index < 4) | |
897 | mac->dma_if = index + 2; | |
898 | else | |
899 | mac->dma_if = index - 4; | |
900 | index++; | |
901 | ||
902 | switch (pdev->device) { | |
903 | case 0xa005: | |
904 | mac->type = MAC_TYPE_GMAC; | |
905 | break; | |
906 | case 0xa006: | |
907 | mac->type = MAC_TYPE_XAUI; | |
908 | break; | |
909 | default: | |
910 | err = -ENODEV; | |
911 | goto out; | |
912 | } | |
913 | ||
914 | /* get mac addr from device tree */ | |
915 | if (pasemi_get_mac_addr(mac) || !is_valid_ether_addr(mac->mac_addr)) { | |
916 | err = -ENODEV; | |
917 | goto out; | |
918 | } | |
919 | memcpy(dev->dev_addr, mac->mac_addr, sizeof(mac->mac_addr)); | |
920 | ||
921 | dev->open = pasemi_mac_open; | |
922 | dev->stop = pasemi_mac_close; | |
923 | dev->hard_start_xmit = pasemi_mac_start_tx; | |
924 | dev->get_stats = pasemi_mac_get_stats; | |
925 | dev->set_multicast_list = pasemi_mac_set_rx_mode; | |
926 | dev->weight = 64; | |
927 | dev->poll = pasemi_mac_poll; | |
928 | dev->features = NETIF_F_HW_CSUM; | |
929 | ||
930 | /* The dma status structure is located in the I/O bridge, and | |
931 | * is cache coherent. | |
932 | */ | |
933 | if (!dma_status) | |
934 | /* XXXOJN This should come from the device tree */ | |
935 | dma_status = __ioremap(0xfd800000, 0x1000, 0); | |
936 | ||
937 | mac->rx_status = &dma_status->rx_sta[mac->dma_rxch]; | |
938 | mac->tx_status = &dma_status->tx_sta[mac->dma_txch]; | |
939 | ||
940 | err = register_netdev(dev); | |
941 | ||
942 | if (err) { | |
943 | dev_err(&mac->pdev->dev, "register_netdev failed with error %d\n", | |
944 | err); | |
945 | goto out; | |
946 | } else | |
947 | printk(KERN_INFO "%s: PA Semi %s: intf %d, txch %d, rxch %d, " | |
948 | "hw addr %02x:%02x:%02x:%02x:%02x:%02x\n", | |
949 | dev->name, mac->type == MAC_TYPE_GMAC ? "GMAC" : "XAUI", | |
950 | mac->dma_if, mac->dma_txch, mac->dma_rxch, | |
951 | dev->dev_addr[0], dev->dev_addr[1], dev->dev_addr[2], | |
952 | dev->dev_addr[3], dev->dev_addr[4], dev->dev_addr[5]); | |
953 | ||
954 | return err; | |
955 | ||
956 | out: | |
957 | pci_dev_put(mac->iob_pdev); | |
958 | out_put_dma_pdev: | |
959 | pci_dev_put(mac->dma_pdev); | |
960 | out_free_netdev: | |
961 | free_netdev(dev); | |
962 | out_disable_device: | |
963 | pci_disable_device(pdev); | |
964 | return err; | |
965 | ||
966 | } | |
967 | ||
968 | static void __devexit pasemi_mac_remove(struct pci_dev *pdev) | |
969 | { | |
970 | struct net_device *netdev = pci_get_drvdata(pdev); | |
971 | struct pasemi_mac *mac; | |
972 | ||
973 | if (!netdev) | |
974 | return; | |
975 | ||
976 | mac = netdev_priv(netdev); | |
977 | ||
978 | unregister_netdev(netdev); | |
979 | ||
980 | pci_disable_device(pdev); | |
981 | pci_dev_put(mac->dma_pdev); | |
982 | pci_dev_put(mac->iob_pdev); | |
983 | ||
984 | pci_set_drvdata(pdev, NULL); | |
985 | free_netdev(netdev); | |
986 | } | |
987 | ||
988 | static struct pci_device_id pasemi_mac_pci_tbl[] = { | |
989 | { PCI_DEVICE(PCI_VENDOR_ID_PASEMI, 0xa005) }, | |
990 | { PCI_DEVICE(PCI_VENDOR_ID_PASEMI, 0xa006) }, | |
991 | }; | |
992 | ||
993 | MODULE_DEVICE_TABLE(pci, pasemi_mac_pci_tbl); | |
994 | ||
995 | static struct pci_driver pasemi_mac_driver = { | |
996 | .name = "pasemi_mac", | |
997 | .id_table = pasemi_mac_pci_tbl, | |
998 | .probe = pasemi_mac_probe, | |
999 | .remove = __devexit_p(pasemi_mac_remove), | |
1000 | }; | |
1001 | ||
1002 | static void __exit pasemi_mac_cleanup_module(void) | |
1003 | { | |
1004 | pci_unregister_driver(&pasemi_mac_driver); | |
1005 | __iounmap(dma_status); | |
1006 | dma_status = NULL; | |
1007 | } | |
1008 | ||
1009 | int pasemi_mac_init_module(void) | |
1010 | { | |
1011 | return pci_register_driver(&pasemi_mac_driver); | |
1012 | } | |
1013 | ||
1014 | MODULE_LICENSE("GPL"); | |
1015 | MODULE_AUTHOR ("Olof Johansson <olof@lixom.net>"); | |
1016 | MODULE_DESCRIPTION("PA Semi PWRficient Ethernet driver"); | |
1017 | ||
1018 | module_init(pasemi_mac_init_module); | |
1019 | module_exit(pasemi_mac_cleanup_module); |