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e190d6b1 BW |
1 | /* |
2 | * File: drivers/net/bfin_mac.c | |
3 | * Based on: | |
4 | * Maintainer: | |
5 | * Bryan Wu <bryan.wu@analog.com> | |
6 | * | |
7 | * Original author: | |
8 | * Luke Yang <luke.yang@analog.com> | |
9 | * | |
10 | * Created: | |
11 | * Description: | |
12 | * | |
13 | * Modified: | |
14 | * Copyright 2004-2006 Analog Devices Inc. | |
15 | * | |
16 | * Bugs: Enter bugs at http://blackfin.uclinux.org/ | |
17 | * | |
18 | * This program is free software ; you can redistribute it and/or modify | |
19 | * it under the terms of the GNU General Public License as published by | |
20 | * the Free Software Foundation ; either version 2, or (at your option) | |
21 | * any later version. | |
22 | * | |
23 | * This program is distributed in the hope that it will be useful, | |
24 | * but WITHOUT ANY WARRANTY ; without even the implied warranty of | |
25 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
26 | * GNU General Public License for more details. | |
27 | * | |
28 | * You should have received a copy of the GNU General Public License | |
29 | * along with this program ; see the file COPYING. | |
30 | * If not, write to the Free Software Foundation, | |
31 | * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
32 | */ | |
33 | ||
34 | #include <linux/init.h> | |
35 | #include <linux/module.h> | |
36 | #include <linux/kernel.h> | |
37 | #include <linux/sched.h> | |
38 | #include <linux/slab.h> | |
39 | #include <linux/delay.h> | |
40 | #include <linux/timer.h> | |
41 | #include <linux/errno.h> | |
42 | #include <linux/irq.h> | |
43 | #include <linux/io.h> | |
44 | #include <linux/ioport.h> | |
45 | #include <linux/crc32.h> | |
46 | #include <linux/device.h> | |
47 | #include <linux/spinlock.h> | |
48 | #include <linux/ethtool.h> | |
49 | #include <linux/mii.h> | |
50 | ||
51 | #include <linux/netdevice.h> | |
52 | #include <linux/etherdevice.h> | |
53 | #include <linux/skbuff.h> | |
54 | ||
55 | #include <linux/platform_device.h> | |
56 | #include <linux/netdevice.h> | |
57 | #include <linux/etherdevice.h> | |
58 | #include <linux/skbuff.h> | |
59 | ||
60 | #include <asm/dma.h> | |
61 | #include <linux/dma-mapping.h> | |
62 | ||
63 | #include <asm/blackfin.h> | |
64 | #include <asm/cacheflush.h> | |
65 | #include <asm/portmux.h> | |
66 | ||
67 | #include "bfin_mac.h" | |
68 | ||
69 | #define DRV_NAME "bfin_mac" | |
70 | #define DRV_VERSION "1.1" | |
71 | #define DRV_AUTHOR "Bryan Wu, Luke Yang" | |
72 | #define DRV_DESC "Blackfin BF53[67] on-chip Ethernet MAC driver" | |
73 | ||
74 | MODULE_AUTHOR(DRV_AUTHOR); | |
75 | MODULE_LICENSE("GPL"); | |
76 | MODULE_DESCRIPTION(DRV_DESC); | |
77 | ||
78 | #if defined(CONFIG_BFIN_MAC_USE_L1) | |
79 | # define bfin_mac_alloc(dma_handle, size) l1_data_sram_zalloc(size) | |
80 | # define bfin_mac_free(dma_handle, ptr) l1_data_sram_free(ptr) | |
81 | #else | |
82 | # define bfin_mac_alloc(dma_handle, size) \ | |
83 | dma_alloc_coherent(NULL, size, dma_handle, GFP_KERNEL) | |
84 | # define bfin_mac_free(dma_handle, ptr) \ | |
85 | dma_free_coherent(NULL, sizeof(*ptr), ptr, dma_handle) | |
86 | #endif | |
87 | ||
88 | #define PKT_BUF_SZ 1580 | |
89 | ||
90 | #define MAX_TIMEOUT_CNT 500 | |
91 | ||
92 | /* pointers to maintain transmit list */ | |
93 | static struct net_dma_desc_tx *tx_list_head; | |
94 | static struct net_dma_desc_tx *tx_list_tail; | |
95 | static struct net_dma_desc_rx *rx_list_head; | |
96 | static struct net_dma_desc_rx *rx_list_tail; | |
97 | static struct net_dma_desc_rx *current_rx_ptr; | |
98 | static struct net_dma_desc_tx *current_tx_ptr; | |
99 | static struct net_dma_desc_tx *tx_desc; | |
100 | static struct net_dma_desc_rx *rx_desc; | |
101 | ||
102 | static void desc_list_free(void) | |
103 | { | |
104 | struct net_dma_desc_rx *r; | |
105 | struct net_dma_desc_tx *t; | |
106 | int i; | |
107 | #if !defined(CONFIG_BFIN_MAC_USE_L1) | |
108 | dma_addr_t dma_handle = 0; | |
109 | #endif | |
110 | ||
111 | if (tx_desc) { | |
112 | t = tx_list_head; | |
113 | for (i = 0; i < CONFIG_BFIN_TX_DESC_NUM; i++) { | |
114 | if (t) { | |
115 | if (t->skb) { | |
116 | dev_kfree_skb(t->skb); | |
117 | t->skb = NULL; | |
118 | } | |
119 | t = t->next; | |
120 | } | |
121 | } | |
122 | bfin_mac_free(dma_handle, tx_desc); | |
123 | } | |
124 | ||
125 | if (rx_desc) { | |
126 | r = rx_list_head; | |
127 | for (i = 0; i < CONFIG_BFIN_RX_DESC_NUM; i++) { | |
128 | if (r) { | |
129 | if (r->skb) { | |
130 | dev_kfree_skb(r->skb); | |
131 | r->skb = NULL; | |
132 | } | |
133 | r = r->next; | |
134 | } | |
135 | } | |
136 | bfin_mac_free(dma_handle, rx_desc); | |
137 | } | |
138 | } | |
139 | ||
140 | static int desc_list_init(void) | |
141 | { | |
142 | int i; | |
143 | struct sk_buff *new_skb; | |
144 | #if !defined(CONFIG_BFIN_MAC_USE_L1) | |
145 | /* | |
146 | * This dma_handle is useless in Blackfin dma_alloc_coherent(). | |
147 | * The real dma handler is the return value of dma_alloc_coherent(). | |
148 | */ | |
149 | dma_addr_t dma_handle; | |
150 | #endif | |
151 | ||
152 | tx_desc = bfin_mac_alloc(&dma_handle, | |
153 | sizeof(struct net_dma_desc_tx) * | |
154 | CONFIG_BFIN_TX_DESC_NUM); | |
155 | if (tx_desc == NULL) | |
156 | goto init_error; | |
157 | ||
158 | rx_desc = bfin_mac_alloc(&dma_handle, | |
159 | sizeof(struct net_dma_desc_rx) * | |
160 | CONFIG_BFIN_RX_DESC_NUM); | |
161 | if (rx_desc == NULL) | |
162 | goto init_error; | |
163 | ||
164 | /* init tx_list */ | |
165 | tx_list_head = tx_list_tail = tx_desc; | |
166 | ||
167 | for (i = 0; i < CONFIG_BFIN_TX_DESC_NUM; i++) { | |
168 | struct net_dma_desc_tx *t = tx_desc + i; | |
169 | struct dma_descriptor *a = &(t->desc_a); | |
170 | struct dma_descriptor *b = &(t->desc_b); | |
171 | ||
172 | /* | |
173 | * disable DMA | |
174 | * read from memory WNR = 0 | |
175 | * wordsize is 32 bits | |
176 | * 6 half words is desc size | |
177 | * large desc flow | |
178 | */ | |
179 | a->config = WDSIZE_32 | NDSIZE_6 | DMAFLOW_LARGE; | |
180 | a->start_addr = (unsigned long)t->packet; | |
181 | a->x_count = 0; | |
182 | a->next_dma_desc = b; | |
183 | ||
184 | /* | |
185 | * enabled DMA | |
186 | * write to memory WNR = 1 | |
187 | * wordsize is 32 bits | |
188 | * disable interrupt | |
189 | * 6 half words is desc size | |
190 | * large desc flow | |
191 | */ | |
192 | b->config = DMAEN | WNR | WDSIZE_32 | NDSIZE_6 | DMAFLOW_LARGE; | |
193 | b->start_addr = (unsigned long)(&(t->status)); | |
194 | b->x_count = 0; | |
195 | ||
196 | t->skb = NULL; | |
197 | tx_list_tail->desc_b.next_dma_desc = a; | |
198 | tx_list_tail->next = t; | |
199 | tx_list_tail = t; | |
200 | } | |
201 | tx_list_tail->next = tx_list_head; /* tx_list is a circle */ | |
202 | tx_list_tail->desc_b.next_dma_desc = &(tx_list_head->desc_a); | |
203 | current_tx_ptr = tx_list_head; | |
204 | ||
205 | /* init rx_list */ | |
206 | rx_list_head = rx_list_tail = rx_desc; | |
207 | ||
208 | for (i = 0; i < CONFIG_BFIN_RX_DESC_NUM; i++) { | |
209 | struct net_dma_desc_rx *r = rx_desc + i; | |
210 | struct dma_descriptor *a = &(r->desc_a); | |
211 | struct dma_descriptor *b = &(r->desc_b); | |
212 | ||
213 | /* allocate a new skb for next time receive */ | |
214 | new_skb = dev_alloc_skb(PKT_BUF_SZ + 2); | |
215 | if (!new_skb) { | |
216 | printk(KERN_NOTICE DRV_NAME | |
217 | ": init: low on mem - packet dropped\n"); | |
218 | goto init_error; | |
219 | } | |
220 | skb_reserve(new_skb, 2); | |
221 | r->skb = new_skb; | |
222 | ||
223 | /* | |
224 | * enabled DMA | |
225 | * write to memory WNR = 1 | |
226 | * wordsize is 32 bits | |
227 | * disable interrupt | |
228 | * 6 half words is desc size | |
229 | * large desc flow | |
230 | */ | |
231 | a->config = DMAEN | WNR | WDSIZE_32 | NDSIZE_6 | DMAFLOW_LARGE; | |
232 | /* since RXDWA is enabled */ | |
233 | a->start_addr = (unsigned long)new_skb->data - 2; | |
234 | a->x_count = 0; | |
235 | a->next_dma_desc = b; | |
236 | ||
237 | /* | |
238 | * enabled DMA | |
239 | * write to memory WNR = 1 | |
240 | * wordsize is 32 bits | |
241 | * enable interrupt | |
242 | * 6 half words is desc size | |
243 | * large desc flow | |
244 | */ | |
245 | b->config = DMAEN | WNR | WDSIZE_32 | DI_EN | | |
246 | NDSIZE_6 | DMAFLOW_LARGE; | |
247 | b->start_addr = (unsigned long)(&(r->status)); | |
248 | b->x_count = 0; | |
249 | ||
250 | rx_list_tail->desc_b.next_dma_desc = a; | |
251 | rx_list_tail->next = r; | |
252 | rx_list_tail = r; | |
253 | } | |
254 | rx_list_tail->next = rx_list_head; /* rx_list is a circle */ | |
255 | rx_list_tail->desc_b.next_dma_desc = &(rx_list_head->desc_a); | |
256 | current_rx_ptr = rx_list_head; | |
257 | ||
258 | return 0; | |
259 | ||
260 | init_error: | |
261 | desc_list_free(); | |
262 | printk(KERN_ERR DRV_NAME ": kmalloc failed\n"); | |
263 | return -ENOMEM; | |
264 | } | |
265 | ||
266 | ||
267 | /*---PHY CONTROL AND CONFIGURATION-----------------------------------------*/ | |
268 | ||
269 | /* Set FER regs to MUX in Ethernet pins */ | |
270 | static int setup_pin_mux(int action) | |
271 | { | |
272 | #if defined(CONFIG_BFIN_MAC_RMII) | |
273 | u16 pin_req[] = P_RMII0; | |
274 | #else | |
275 | u16 pin_req[] = P_MII0; | |
276 | #endif | |
277 | ||
278 | if (action) { | |
279 | if (peripheral_request_list(pin_req, DRV_NAME)) { | |
280 | printk(KERN_ERR DRV_NAME | |
281 | ": Requesting Peripherals failed\n"); | |
282 | return -EFAULT; | |
283 | } | |
284 | } else | |
285 | peripheral_free_list(pin_req); | |
286 | ||
287 | return 0; | |
288 | } | |
289 | ||
290 | /* Wait until the previous MDC/MDIO transaction has completed */ | |
291 | static void poll_mdc_done(void) | |
292 | { | |
293 | int timeout_cnt = MAX_TIMEOUT_CNT; | |
294 | ||
295 | /* poll the STABUSY bit */ | |
296 | while ((bfin_read_EMAC_STAADD()) & STABUSY) { | |
297 | mdelay(10); | |
298 | if (timeout_cnt-- < 0) { | |
299 | printk(KERN_ERR DRV_NAME | |
300 | ": wait MDC/MDIO transaction to complete timeout\n"); | |
301 | break; | |
302 | } | |
303 | } | |
304 | } | |
305 | ||
306 | /* Read an off-chip register in a PHY through the MDC/MDIO port */ | |
307 | static u16 read_phy_reg(u16 PHYAddr, u16 RegAddr) | |
308 | { | |
309 | poll_mdc_done(); | |
310 | /* read mode */ | |
311 | bfin_write_EMAC_STAADD(SET_PHYAD(PHYAddr) | | |
312 | SET_REGAD(RegAddr) | | |
313 | STABUSY); | |
314 | poll_mdc_done(); | |
315 | ||
316 | return (u16) bfin_read_EMAC_STADAT(); | |
317 | } | |
318 | ||
319 | /* Write an off-chip register in a PHY through the MDC/MDIO port */ | |
320 | static void raw_write_phy_reg(u16 PHYAddr, u16 RegAddr, u32 Data) | |
321 | { | |
322 | bfin_write_EMAC_STADAT(Data); | |
323 | ||
324 | /* write mode */ | |
325 | bfin_write_EMAC_STAADD(SET_PHYAD(PHYAddr) | | |
326 | SET_REGAD(RegAddr) | | |
327 | STAOP | | |
328 | STABUSY); | |
329 | ||
330 | poll_mdc_done(); | |
331 | } | |
332 | ||
333 | static void write_phy_reg(u16 PHYAddr, u16 RegAddr, u32 Data) | |
334 | { | |
335 | poll_mdc_done(); | |
336 | raw_write_phy_reg(PHYAddr, RegAddr, Data); | |
337 | } | |
338 | ||
339 | /* set up the phy */ | |
340 | static void bf537mac_setphy(struct net_device *dev) | |
341 | { | |
342 | u16 phydat; | |
343 | struct bf537mac_local *lp = netdev_priv(dev); | |
344 | ||
345 | /* Program PHY registers */ | |
346 | pr_debug("start setting up phy\n"); | |
347 | ||
348 | /* issue a reset */ | |
349 | raw_write_phy_reg(lp->PhyAddr, PHYREG_MODECTL, 0x8000); | |
350 | ||
351 | /* wait half a second */ | |
352 | msleep(500); | |
353 | ||
354 | phydat = read_phy_reg(lp->PhyAddr, PHYREG_MODECTL); | |
355 | ||
356 | /* advertise flow control supported */ | |
357 | phydat = read_phy_reg(lp->PhyAddr, PHYREG_ANAR); | |
358 | phydat |= (1 << 10); | |
359 | write_phy_reg(lp->PhyAddr, PHYREG_ANAR, phydat); | |
360 | ||
361 | phydat = 0; | |
362 | if (lp->Negotiate) | |
363 | phydat |= 0x1000; /* enable auto negotiation */ | |
364 | else { | |
365 | if (lp->FullDuplex) | |
366 | phydat |= (1 << 8); /* full duplex */ | |
367 | else | |
368 | phydat &= (~(1 << 8)); /* half duplex */ | |
369 | ||
370 | if (!lp->Port10) | |
371 | phydat |= (1 << 13); /* 100 Mbps */ | |
372 | else | |
373 | phydat &= (~(1 << 13)); /* 10 Mbps */ | |
374 | } | |
375 | ||
376 | if (lp->Loopback) | |
377 | phydat |= (1 << 14); /* enable TX->RX loopback */ | |
378 | ||
379 | write_phy_reg(lp->PhyAddr, PHYREG_MODECTL, phydat); | |
380 | msleep(500); | |
381 | ||
382 | phydat = read_phy_reg(lp->PhyAddr, PHYREG_MODECTL); | |
383 | /* check for SMSC PHY */ | |
384 | if ((read_phy_reg(lp->PhyAddr, PHYREG_PHYID1) == 0x7) && | |
385 | ((read_phy_reg(lp->PhyAddr, PHYREG_PHYID2) & 0xfff0) == 0xC0A0)) { | |
386 | /* | |
387 | * we have SMSC PHY so reqest interrupt | |
388 | * on link down condition | |
389 | */ | |
390 | ||
391 | /* enable interrupts */ | |
392 | write_phy_reg(lp->PhyAddr, 30, 0x0ff); | |
393 | } | |
394 | } | |
395 | ||
396 | /**************************************************************************/ | |
397 | void setup_system_regs(struct net_device *dev) | |
398 | { | |
399 | int phyaddr; | |
400 | unsigned short sysctl, phydat; | |
401 | u32 opmode; | |
402 | struct bf537mac_local *lp = netdev_priv(dev); | |
403 | int count = 0; | |
404 | ||
405 | phyaddr = lp->PhyAddr; | |
406 | ||
407 | /* Enable PHY output */ | |
408 | if (!(bfin_read_VR_CTL() & PHYCLKOE)) | |
409 | bfin_write_VR_CTL(bfin_read_VR_CTL() | PHYCLKOE); | |
410 | ||
411 | /* MDC = 2.5 MHz */ | |
412 | sysctl = SET_MDCDIV(24); | |
413 | /* Odd word alignment for Receive Frame DMA word */ | |
414 | /* Configure checksum support and rcve frame word alignment */ | |
415 | #if defined(BFIN_MAC_CSUM_OFFLOAD) | |
416 | sysctl |= RXDWA | RXCKS; | |
417 | #else | |
418 | sysctl |= RXDWA; | |
419 | #endif | |
420 | bfin_write_EMAC_SYSCTL(sysctl); | |
421 | /* auto negotiation on */ | |
422 | /* full duplex */ | |
423 | /* 100 Mbps */ | |
424 | phydat = PHY_ANEG_EN | PHY_DUPLEX | PHY_SPD_SET; | |
425 | write_phy_reg(phyaddr, PHYREG_MODECTL, phydat); | |
426 | ||
427 | /* test if full duplex supported */ | |
428 | do { | |
429 | msleep(100); | |
430 | phydat = read_phy_reg(phyaddr, PHYREG_MODESTAT); | |
431 | if (count > 30) { | |
432 | printk(KERN_NOTICE DRV_NAME ": Link is down\n"); | |
433 | printk(KERN_NOTICE DRV_NAME | |
434 | "please check your network connection\n"); | |
435 | break; | |
436 | } | |
437 | count++; | |
438 | } while (!(phydat & 0x0004)); | |
439 | ||
440 | phydat = read_phy_reg(phyaddr, PHYREG_ANLPAR); | |
441 | ||
442 | if ((phydat & 0x0100) || (phydat & 0x0040)) { | |
443 | opmode = FDMODE; | |
444 | } else { | |
445 | opmode = 0; | |
446 | printk(KERN_INFO DRV_NAME | |
447 | ": Network is set to half duplex\n"); | |
448 | } | |
449 | ||
450 | #if defined(CONFIG_BFIN_MAC_RMII) | |
451 | opmode |= RMII; /* For Now only 100MBit are supported */ | |
452 | #endif | |
453 | ||
454 | bfin_write_EMAC_OPMODE(opmode); | |
455 | ||
456 | bfin_write_EMAC_MMC_CTL(RSTC | CROLL); | |
457 | ||
458 | /* Initialize the TX DMA channel registers */ | |
459 | bfin_write_DMA2_X_COUNT(0); | |
460 | bfin_write_DMA2_X_MODIFY(4); | |
461 | bfin_write_DMA2_Y_COUNT(0); | |
462 | bfin_write_DMA2_Y_MODIFY(0); | |
463 | ||
464 | /* Initialize the RX DMA channel registers */ | |
465 | bfin_write_DMA1_X_COUNT(0); | |
466 | bfin_write_DMA1_X_MODIFY(4); | |
467 | bfin_write_DMA1_Y_COUNT(0); | |
468 | bfin_write_DMA1_Y_MODIFY(0); | |
469 | } | |
470 | ||
471 | void setup_mac_addr(u8 * mac_addr) | |
472 | { | |
473 | u32 addr_low = le32_to_cpu(*(__le32 *) & mac_addr[0]); | |
474 | u16 addr_hi = le16_to_cpu(*(__le16 *) & mac_addr[4]); | |
475 | ||
476 | /* this depends on a little-endian machine */ | |
477 | bfin_write_EMAC_ADDRLO(addr_low); | |
478 | bfin_write_EMAC_ADDRHI(addr_hi); | |
479 | } | |
480 | ||
481 | static void adjust_tx_list(void) | |
482 | { | |
483 | int timeout_cnt = MAX_TIMEOUT_CNT; | |
484 | ||
485 | if (tx_list_head->status.status_word != 0 | |
486 | && current_tx_ptr != tx_list_head) { | |
487 | goto adjust_head; /* released something, just return; */ | |
488 | } | |
489 | ||
490 | /* | |
491 | * if nothing released, check wait condition | |
492 | * current's next can not be the head, | |
493 | * otherwise the dma will not stop as we want | |
494 | */ | |
495 | if (current_tx_ptr->next->next == tx_list_head) { | |
496 | while (tx_list_head->status.status_word == 0) { | |
497 | mdelay(10); | |
498 | if (tx_list_head->status.status_word != 0 | |
499 | || !(bfin_read_DMA2_IRQ_STATUS() & 0x08)) { | |
500 | goto adjust_head; | |
501 | } | |
502 | if (timeout_cnt-- < 0) { | |
503 | printk(KERN_ERR DRV_NAME | |
504 | ": wait for adjust tx list head timeout\n"); | |
505 | break; | |
506 | } | |
507 | } | |
508 | if (tx_list_head->status.status_word != 0) { | |
509 | goto adjust_head; | |
510 | } | |
511 | } | |
512 | ||
513 | return; | |
514 | ||
515 | adjust_head: | |
516 | do { | |
517 | tx_list_head->desc_a.config &= ~DMAEN; | |
518 | tx_list_head->status.status_word = 0; | |
519 | if (tx_list_head->skb) { | |
520 | dev_kfree_skb(tx_list_head->skb); | |
521 | tx_list_head->skb = NULL; | |
522 | } else { | |
523 | printk(KERN_ERR DRV_NAME | |
524 | ": no sk_buff in a transmitted frame!\n"); | |
525 | } | |
526 | tx_list_head = tx_list_head->next; | |
527 | } while (tx_list_head->status.status_word != 0 | |
528 | && current_tx_ptr != tx_list_head); | |
529 | return; | |
530 | ||
531 | } | |
532 | ||
533 | static int bf537mac_hard_start_xmit(struct sk_buff *skb, | |
534 | struct net_device *dev) | |
535 | { | |
536 | struct bf537mac_local *lp = netdev_priv(dev); | |
537 | unsigned int data; | |
538 | ||
539 | current_tx_ptr->skb = skb; | |
540 | ||
541 | /* | |
542 | * Is skb->data always 16-bit aligned? | |
543 | * Do we need to memcpy((char *)(tail->packet + 2), skb->data, len)? | |
544 | */ | |
545 | if ((((unsigned int)(skb->data)) & 0x02) == 2) { | |
546 | /* move skb->data to current_tx_ptr payload */ | |
547 | data = (unsigned int)(skb->data) - 2; | |
548 | *((unsigned short *)data) = (unsigned short)(skb->len); | |
549 | current_tx_ptr->desc_a.start_addr = (unsigned long)data; | |
550 | /* this is important! */ | |
551 | blackfin_dcache_flush_range(data, (data + (skb->len)) + 2); | |
552 | ||
553 | } else { | |
554 | *((unsigned short *)(current_tx_ptr->packet)) = | |
555 | (unsigned short)(skb->len); | |
556 | memcpy((char *)(current_tx_ptr->packet + 2), skb->data, | |
557 | (skb->len)); | |
558 | current_tx_ptr->desc_a.start_addr = | |
559 | (unsigned long)current_tx_ptr->packet; | |
560 | if (current_tx_ptr->status.status_word != 0) | |
561 | current_tx_ptr->status.status_word = 0; | |
562 | blackfin_dcache_flush_range((unsigned int)current_tx_ptr-> | |
563 | packet, | |
564 | (unsigned int)(current_tx_ptr-> | |
565 | packet + skb->len) + | |
566 | 2); | |
567 | } | |
568 | ||
569 | /* enable this packet's dma */ | |
570 | current_tx_ptr->desc_a.config |= DMAEN; | |
571 | ||
572 | /* tx dma is running, just return */ | |
573 | if (bfin_read_DMA2_IRQ_STATUS() & 0x08) | |
574 | goto out; | |
575 | ||
576 | /* tx dma is not running */ | |
577 | bfin_write_DMA2_NEXT_DESC_PTR(&(current_tx_ptr->desc_a)); | |
578 | /* dma enabled, read from memory, size is 6 */ | |
579 | bfin_write_DMA2_CONFIG(current_tx_ptr->desc_a.config); | |
580 | /* Turn on the EMAC tx */ | |
581 | bfin_write_EMAC_OPMODE(bfin_read_EMAC_OPMODE() | TE); | |
582 | ||
583 | out: | |
584 | adjust_tx_list(); | |
585 | current_tx_ptr = current_tx_ptr->next; | |
586 | dev->trans_start = jiffies; | |
587 | lp->stats.tx_packets++; | |
588 | lp->stats.tx_bytes += (skb->len); | |
589 | return 0; | |
590 | } | |
591 | ||
592 | static void bf537mac_rx(struct net_device *dev) | |
593 | { | |
594 | struct sk_buff *skb, *new_skb; | |
595 | struct bf537mac_local *lp = netdev_priv(dev); | |
596 | unsigned short len; | |
597 | ||
598 | /* allocate a new skb for next time receive */ | |
599 | skb = current_rx_ptr->skb; | |
600 | new_skb = dev_alloc_skb(PKT_BUF_SZ + 2); | |
601 | if (!new_skb) { | |
602 | printk(KERN_NOTICE DRV_NAME | |
603 | ": rx: low on mem - packet dropped\n"); | |
604 | lp->stats.rx_dropped++; | |
605 | goto out; | |
606 | } | |
607 | /* reserve 2 bytes for RXDWA padding */ | |
608 | skb_reserve(new_skb, 2); | |
609 | current_rx_ptr->skb = new_skb; | |
610 | current_rx_ptr->desc_a.start_addr = (unsigned long)new_skb->data - 2; | |
611 | ||
612 | len = (unsigned short)((current_rx_ptr->status.status_word) & RX_FRLEN); | |
613 | skb_put(skb, len); | |
614 | blackfin_dcache_invalidate_range((unsigned long)skb->head, | |
615 | (unsigned long)skb->tail); | |
616 | ||
617 | dev->last_rx = jiffies; | |
618 | skb->dev = dev; | |
619 | skb->protocol = eth_type_trans(skb, dev); | |
620 | #if defined(BFIN_MAC_CSUM_OFFLOAD) | |
621 | skb->csum = current_rx_ptr->status.ip_payload_csum; | |
622 | skb->ip_summed = CHECKSUM_PARTIAL; | |
623 | #endif | |
624 | ||
625 | netif_rx(skb); | |
626 | lp->stats.rx_packets++; | |
627 | lp->stats.rx_bytes += len; | |
628 | current_rx_ptr->status.status_word = 0x00000000; | |
629 | current_rx_ptr = current_rx_ptr->next; | |
630 | ||
631 | out: | |
632 | return; | |
633 | } | |
634 | ||
635 | /* interrupt routine to handle rx and error signal */ | |
636 | static irqreturn_t bf537mac_interrupt(int irq, void *dev_id) | |
637 | { | |
638 | struct net_device *dev = dev_id; | |
639 | int number = 0; | |
640 | ||
641 | get_one_packet: | |
642 | if (current_rx_ptr->status.status_word == 0) { | |
643 | /* no more new packet received */ | |
644 | if (number == 0) { | |
645 | if (current_rx_ptr->next->status.status_word != 0) { | |
646 | current_rx_ptr = current_rx_ptr->next; | |
647 | goto real_rx; | |
648 | } | |
649 | } | |
650 | bfin_write_DMA1_IRQ_STATUS(bfin_read_DMA1_IRQ_STATUS() | | |
651 | DMA_DONE | DMA_ERR); | |
652 | return IRQ_HANDLED; | |
653 | } | |
654 | ||
655 | real_rx: | |
656 | bf537mac_rx(dev); | |
657 | number++; | |
658 | goto get_one_packet; | |
659 | } | |
660 | ||
661 | #ifdef CONFIG_NET_POLL_CONTROLLER | |
662 | static void bf537mac_poll(struct net_device *dev) | |
663 | { | |
664 | disable_irq(IRQ_MAC_RX); | |
665 | bf537mac_interrupt(IRQ_MAC_RX, dev); | |
666 | enable_irq(IRQ_MAC_RX); | |
667 | } | |
668 | #endif /* CONFIG_NET_POLL_CONTROLLER */ | |
669 | ||
670 | static void bf537mac_reset(void) | |
671 | { | |
672 | unsigned int opmode; | |
673 | ||
674 | opmode = bfin_read_EMAC_OPMODE(); | |
675 | opmode &= (~RE); | |
676 | opmode &= (~TE); | |
677 | /* Turn off the EMAC */ | |
678 | bfin_write_EMAC_OPMODE(opmode); | |
679 | } | |
680 | ||
681 | /* | |
682 | * Enable Interrupts, Receive, and Transmit | |
683 | */ | |
684 | static int bf537mac_enable(struct net_device *dev) | |
685 | { | |
686 | u32 opmode; | |
687 | ||
688 | pr_debug("%s: %s\n", dev->name, __FUNCTION__); | |
689 | ||
690 | /* Set RX DMA */ | |
691 | bfin_write_DMA1_NEXT_DESC_PTR(&(rx_list_head->desc_a)); | |
692 | bfin_write_DMA1_CONFIG(rx_list_head->desc_a.config); | |
693 | ||
694 | /* Wait MII done */ | |
695 | poll_mdc_done(); | |
696 | ||
697 | /* We enable only RX here */ | |
698 | /* ASTP : Enable Automatic Pad Stripping | |
699 | PR : Promiscuous Mode for test | |
700 | PSF : Receive frames with total length less than 64 bytes. | |
701 | FDMODE : Full Duplex Mode | |
702 | LB : Internal Loopback for test | |
703 | RE : Receiver Enable */ | |
704 | opmode = bfin_read_EMAC_OPMODE(); | |
705 | if (opmode & FDMODE) | |
706 | opmode |= PSF; | |
707 | else | |
708 | opmode |= DRO | DC | PSF; | |
709 | opmode |= RE; | |
710 | ||
711 | #if defined(CONFIG_BFIN_MAC_RMII) | |
712 | opmode |= RMII; /* For Now only 100MBit are supported */ | |
713 | #ifdef CONFIG_BF_REV_0_2 | |
714 | opmode |= TE; | |
715 | #endif | |
716 | #endif | |
717 | /* Turn on the EMAC rx */ | |
718 | bfin_write_EMAC_OPMODE(opmode); | |
719 | ||
720 | return 0; | |
721 | } | |
722 | ||
723 | /* Our watchdog timed out. Called by the networking layer */ | |
724 | static void bf537mac_timeout(struct net_device *dev) | |
725 | { | |
726 | pr_debug("%s: %s\n", dev->name, __FUNCTION__); | |
727 | ||
728 | bf537mac_reset(); | |
729 | ||
730 | /* reset tx queue */ | |
731 | tx_list_tail = tx_list_head->next; | |
732 | ||
733 | bf537mac_enable(dev); | |
734 | ||
735 | /* We can accept TX packets again */ | |
736 | dev->trans_start = jiffies; | |
737 | netif_wake_queue(dev); | |
738 | } | |
739 | ||
740 | /* | |
741 | * Get the current statistics. | |
742 | * This may be called with the card open or closed. | |
743 | */ | |
744 | static struct net_device_stats *bf537mac_query_statistics(struct net_device | |
745 | *dev) | |
746 | { | |
747 | struct bf537mac_local *lp = netdev_priv(dev); | |
748 | ||
749 | pr_debug("%s: %s\n", dev->name, __FUNCTION__); | |
750 | ||
751 | return &lp->stats; | |
752 | } | |
753 | ||
754 | /* | |
755 | * This routine will, depending on the values passed to it, | |
756 | * either make it accept multicast packets, go into | |
757 | * promiscuous mode (for TCPDUMP and cousins) or accept | |
758 | * a select set of multicast packets | |
759 | */ | |
760 | static void bf537mac_set_multicast_list(struct net_device *dev) | |
761 | { | |
762 | u32 sysctl; | |
763 | ||
764 | if (dev->flags & IFF_PROMISC) { | |
765 | printk(KERN_INFO "%s: set to promisc mode\n", dev->name); | |
766 | sysctl = bfin_read_EMAC_OPMODE(); | |
767 | sysctl |= RAF; | |
768 | bfin_write_EMAC_OPMODE(sysctl); | |
769 | } else if (dev->flags & IFF_ALLMULTI || dev->mc_count) { | |
770 | /* accept all multicast */ | |
771 | sysctl = bfin_read_EMAC_OPMODE(); | |
772 | sysctl |= PAM; | |
773 | bfin_write_EMAC_OPMODE(sysctl); | |
774 | } else { | |
775 | /* clear promisc or multicast mode */ | |
776 | sysctl = bfin_read_EMAC_OPMODE(); | |
777 | sysctl &= ~(RAF | PAM); | |
778 | bfin_write_EMAC_OPMODE(sysctl); | |
779 | } | |
780 | } | |
781 | ||
782 | /* | |
783 | * this puts the device in an inactive state | |
784 | */ | |
785 | static void bf537mac_shutdown(struct net_device *dev) | |
786 | { | |
787 | /* Turn off the EMAC */ | |
788 | bfin_write_EMAC_OPMODE(0x00000000); | |
789 | /* Turn off the EMAC RX DMA */ | |
790 | bfin_write_DMA1_CONFIG(0x0000); | |
791 | bfin_write_DMA2_CONFIG(0x0000); | |
792 | } | |
793 | ||
794 | /* | |
795 | * Open and Initialize the interface | |
796 | * | |
797 | * Set up everything, reset the card, etc.. | |
798 | */ | |
799 | static int bf537mac_open(struct net_device *dev) | |
800 | { | |
801 | pr_debug("%s: %s\n", dev->name, __FUNCTION__); | |
802 | ||
803 | /* | |
804 | * Check that the address is valid. If its not, refuse | |
805 | * to bring the device up. The user must specify an | |
806 | * address using ifconfig eth0 hw ether xx:xx:xx:xx:xx:xx | |
807 | */ | |
808 | if (!is_valid_ether_addr(dev->dev_addr)) { | |
809 | printk(KERN_WARNING DRV_NAME ": no valid ethernet hw addr\n"); | |
810 | return -EINVAL; | |
811 | } | |
812 | ||
813 | /* initial rx and tx list */ | |
814 | desc_list_init(); | |
815 | ||
816 | bf537mac_setphy(dev); | |
817 | setup_system_regs(dev); | |
818 | bf537mac_reset(); | |
819 | bf537mac_enable(dev); | |
820 | ||
821 | pr_debug("hardware init finished\n"); | |
822 | netif_start_queue(dev); | |
823 | netif_carrier_on(dev); | |
824 | ||
825 | return 0; | |
826 | } | |
827 | ||
828 | /* | |
829 | * | |
830 | * this makes the board clean up everything that it can | |
831 | * and not talk to the outside world. Caused by | |
832 | * an 'ifconfig ethX down' | |
833 | */ | |
834 | static int bf537mac_close(struct net_device *dev) | |
835 | { | |
836 | pr_debug("%s: %s\n", dev->name, __FUNCTION__); | |
837 | ||
838 | netif_stop_queue(dev); | |
839 | netif_carrier_off(dev); | |
840 | ||
841 | /* clear everything */ | |
842 | bf537mac_shutdown(dev); | |
843 | ||
844 | /* free the rx/tx buffers */ | |
845 | desc_list_free(); | |
846 | ||
847 | return 0; | |
848 | } | |
849 | ||
850 | static int __init bf537mac_probe(struct net_device *dev) | |
851 | { | |
852 | struct bf537mac_local *lp = netdev_priv(dev); | |
853 | int retval; | |
854 | ||
855 | /* Grab the MAC address in the MAC */ | |
856 | *(__le32 *) (&(dev->dev_addr[0])) = cpu_to_le32(bfin_read_EMAC_ADDRLO()); | |
857 | *(__le16 *) (&(dev->dev_addr[4])) = cpu_to_le16((u16) bfin_read_EMAC_ADDRHI()); | |
858 | ||
859 | /* probe mac */ | |
860 | /*todo: how to proble? which is revision_register */ | |
861 | bfin_write_EMAC_ADDRLO(0x12345678); | |
862 | if (bfin_read_EMAC_ADDRLO() != 0x12345678) { | |
863 | pr_debug("can't detect bf537 mac!\n"); | |
864 | retval = -ENODEV; | |
865 | goto err_out; | |
866 | } | |
867 | ||
868 | /* set the GPIO pins to Ethernet mode */ | |
869 | retval = setup_pin_mux(1); | |
870 | ||
871 | if (retval) | |
872 | return retval; | |
873 | ||
874 | /*Is it valid? (Did bootloader initialize it?) */ | |
875 | if (!is_valid_ether_addr(dev->dev_addr)) { | |
876 | /* Grab the MAC from the board somehow - this is done in the | |
877 | arch/blackfin/mach-bf537/boards/eth_mac.c */ | |
878 | get_bf537_ether_addr(dev->dev_addr); | |
879 | } | |
880 | ||
881 | /* If still not valid, get a random one */ | |
882 | if (!is_valid_ether_addr(dev->dev_addr)) { | |
883 | random_ether_addr(dev->dev_addr); | |
884 | } | |
885 | ||
886 | setup_mac_addr(dev->dev_addr); | |
887 | ||
888 | /* Fill in the fields of the device structure with ethernet values. */ | |
889 | ether_setup(dev); | |
890 | ||
891 | dev->open = bf537mac_open; | |
892 | dev->stop = bf537mac_close; | |
893 | dev->hard_start_xmit = bf537mac_hard_start_xmit; | |
894 | dev->tx_timeout = bf537mac_timeout; | |
895 | dev->get_stats = bf537mac_query_statistics; | |
896 | dev->set_multicast_list = bf537mac_set_multicast_list; | |
897 | #ifdef CONFIG_NET_POLL_CONTROLLER | |
898 | dev->poll_controller = bf537mac_poll; | |
899 | #endif | |
900 | ||
901 | /* fill in some of the fields */ | |
902 | lp->version = 1; | |
903 | lp->PhyAddr = 0x01; | |
904 | lp->CLKIN = 25; | |
905 | lp->FullDuplex = 0; | |
906 | lp->Negotiate = 1; | |
907 | lp->FlowControl = 0; | |
908 | spin_lock_init(&lp->lock); | |
909 | ||
910 | /* now, enable interrupts */ | |
911 | /* register irq handler */ | |
912 | if (request_irq | |
913 | (IRQ_MAC_RX, bf537mac_interrupt, IRQF_DISABLED | IRQF_SHARED, | |
914 | "BFIN537_MAC_RX", dev)) { | |
915 | printk(KERN_WARNING DRV_NAME | |
916 | ": Unable to attach BlackFin MAC RX interrupt\n"); | |
917 | return -EBUSY; | |
918 | } | |
919 | ||
920 | /* Enable PHY output early */ | |
921 | if (!(bfin_read_VR_CTL() & PHYCLKOE)) | |
922 | bfin_write_VR_CTL(bfin_read_VR_CTL() | PHYCLKOE); | |
923 | ||
924 | retval = register_netdev(dev); | |
925 | if (retval == 0) { | |
926 | /* now, print out the card info, in a short format.. */ | |
927 | printk(KERN_INFO "%s: Version %s, %s\n", | |
928 | DRV_NAME, DRV_VERSION, DRV_DESC); | |
929 | } | |
930 | ||
931 | err_out: | |
932 | return retval; | |
933 | } | |
934 | ||
935 | static int bfin_mac_probe(struct platform_device *pdev) | |
936 | { | |
937 | struct net_device *ndev; | |
938 | ||
939 | ndev = alloc_etherdev(sizeof(struct bf537mac_local)); | |
940 | if (!ndev) { | |
941 | printk(KERN_WARNING DRV_NAME ": could not allocate device\n"); | |
942 | return -ENOMEM; | |
943 | } | |
944 | ||
945 | SET_MODULE_OWNER(ndev); | |
946 | SET_NETDEV_DEV(ndev, &pdev->dev); | |
947 | ||
948 | platform_set_drvdata(pdev, ndev); | |
949 | ||
950 | if (bf537mac_probe(ndev) != 0) { | |
951 | platform_set_drvdata(pdev, NULL); | |
952 | free_netdev(ndev); | |
953 | printk(KERN_WARNING DRV_NAME ": not found\n"); | |
954 | return -ENODEV; | |
955 | } | |
956 | ||
957 | return 0; | |
958 | } | |
959 | ||
960 | static int bfin_mac_remove(struct platform_device *pdev) | |
961 | { | |
962 | struct net_device *ndev = platform_get_drvdata(pdev); | |
963 | ||
964 | platform_set_drvdata(pdev, NULL); | |
965 | ||
966 | unregister_netdev(ndev); | |
967 | ||
968 | free_irq(IRQ_MAC_RX, ndev); | |
969 | ||
970 | free_netdev(ndev); | |
971 | ||
972 | setup_pin_mux(0); | |
973 | ||
974 | return 0; | |
975 | } | |
976 | ||
977 | static int bfin_mac_suspend(struct platform_device *pdev, pm_message_t state) | |
978 | { | |
979 | return 0; | |
980 | } | |
981 | ||
982 | static int bfin_mac_resume(struct platform_device *pdev) | |
983 | { | |
984 | return 0; | |
985 | } | |
986 | ||
987 | static struct platform_driver bfin_mac_driver = { | |
988 | .probe = bfin_mac_probe, | |
989 | .remove = bfin_mac_remove, | |
990 | .resume = bfin_mac_resume, | |
991 | .suspend = bfin_mac_suspend, | |
992 | .driver = { | |
993 | .name = DRV_NAME, | |
994 | }, | |
995 | }; | |
996 | ||
997 | static int __init bfin_mac_init(void) | |
998 | { | |
999 | return platform_driver_register(&bfin_mac_driver); | |
1000 | } | |
1001 | ||
1002 | module_init(bfin_mac_init); | |
1003 | ||
1004 | static void __exit bfin_mac_cleanup(void) | |
1005 | { | |
1006 | platform_driver_unregister(&bfin_mac_driver); | |
1007 | } | |
1008 | ||
1009 | module_exit(bfin_mac_cleanup); |