spider_net.c 62 KB

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  1. /*
  2. * Network device driver for Cell Processor-Based Blade
  3. *
  4. * (C) Copyright IBM Corp. 2005
  5. *
  6. * Authors : Utz Bacher <utz.bacher@de.ibm.com>
  7. * Jens Osterkamp <Jens.Osterkamp@de.ibm.com>
  8. *
  9. * This program is free software; you can redistribute it and/or modify
  10. * it under the terms of the GNU General Public License as published by
  11. * the Free Software Foundation; either version 2, or (at your option)
  12. * any later version.
  13. *
  14. * This program is distributed in the hope that it will be useful,
  15. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  17. * GNU General Public License for more details.
  18. *
  19. * You should have received a copy of the GNU General Public License
  20. * along with this program; if not, write to the Free Software
  21. * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22. */
  23. #include <linux/compiler.h>
  24. #include <linux/crc32.h>
  25. #include <linux/delay.h>
  26. #include <linux/etherdevice.h>
  27. #include <linux/ethtool.h>
  28. #include <linux/firmware.h>
  29. #include <linux/if_vlan.h>
  30. #include <linux/in.h>
  31. #include <linux/init.h>
  32. #include <linux/ioport.h>
  33. #include <linux/ip.h>
  34. #include <linux/kernel.h>
  35. #include <linux/mii.h>
  36. #include <linux/module.h>
  37. #include <linux/netdevice.h>
  38. #include <linux/device.h>
  39. #include <linux/pci.h>
  40. #include <linux/skbuff.h>
  41. #include <linux/slab.h>
  42. #include <linux/tcp.h>
  43. #include <linux/types.h>
  44. #include <linux/vmalloc.h>
  45. #include <linux/wait.h>
  46. #include <linux/workqueue.h>
  47. #include <asm/bitops.h>
  48. #include <asm/pci-bridge.h>
  49. #include <net/checksum.h>
  50. #include "spider_net.h"
  51. MODULE_AUTHOR("Utz Bacher <utz.bacher@de.ibm.com> and Jens Osterkamp " \
  52. "<Jens.Osterkamp@de.ibm.com>");
  53. MODULE_DESCRIPTION("Spider Southbridge Gigabit Ethernet driver");
  54. MODULE_LICENSE("GPL");
  55. MODULE_VERSION(VERSION);
  56. static int rx_descriptors = SPIDER_NET_RX_DESCRIPTORS_DEFAULT;
  57. static int tx_descriptors = SPIDER_NET_TX_DESCRIPTORS_DEFAULT;
  58. module_param(rx_descriptors, int, 0444);
  59. module_param(tx_descriptors, int, 0444);
  60. MODULE_PARM_DESC(rx_descriptors, "number of descriptors used " \
  61. "in rx chains");
  62. MODULE_PARM_DESC(tx_descriptors, "number of descriptors used " \
  63. "in tx chain");
  64. char spider_net_driver_name[] = "spidernet";
  65. static struct pci_device_id spider_net_pci_tbl[] = {
  66. { PCI_VENDOR_ID_TOSHIBA_2, PCI_DEVICE_ID_TOSHIBA_SPIDER_NET,
  67. PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
  68. { 0, }
  69. };
  70. MODULE_DEVICE_TABLE(pci, spider_net_pci_tbl);
  71. /**
  72. * spider_net_read_reg - reads an SMMIO register of a card
  73. * @card: device structure
  74. * @reg: register to read from
  75. *
  76. * returns the content of the specified SMMIO register.
  77. */
  78. static inline u32
  79. spider_net_read_reg(struct spider_net_card *card, u32 reg)
  80. {
  81. /* We use the powerpc specific variants instead of readl_be() because
  82. * we know spidernet is not a real PCI device and we can thus avoid the
  83. * performance hit caused by the PCI workarounds.
  84. */
  85. return in_be32(card->regs + reg);
  86. }
  87. /**
  88. * spider_net_write_reg - writes to an SMMIO register of a card
  89. * @card: device structure
  90. * @reg: register to write to
  91. * @value: value to write into the specified SMMIO register
  92. */
  93. static inline void
  94. spider_net_write_reg(struct spider_net_card *card, u32 reg, u32 value)
  95. {
  96. /* We use the powerpc specific variants instead of writel_be() because
  97. * we know spidernet is not a real PCI device and we can thus avoid the
  98. * performance hit caused by the PCI workarounds.
  99. */
  100. out_be32(card->regs + reg, value);
  101. }
  102. /** spider_net_write_phy - write to phy register
  103. * @netdev: adapter to be written to
  104. * @mii_id: id of MII
  105. * @reg: PHY register
  106. * @val: value to be written to phy register
  107. *
  108. * spider_net_write_phy_register writes to an arbitrary PHY
  109. * register via the spider GPCWOPCMD register. We assume the queue does
  110. * not run full (not more than 15 commands outstanding).
  111. **/
  112. static void
  113. spider_net_write_phy(struct net_device *netdev, int mii_id,
  114. int reg, int val)
  115. {
  116. struct spider_net_card *card = netdev_priv(netdev);
  117. u32 writevalue;
  118. writevalue = ((u32)mii_id << 21) |
  119. ((u32)reg << 16) | ((u32)val);
  120. spider_net_write_reg(card, SPIDER_NET_GPCWOPCMD, writevalue);
  121. }
  122. /** spider_net_read_phy - read from phy register
  123. * @netdev: network device to be read from
  124. * @mii_id: id of MII
  125. * @reg: PHY register
  126. *
  127. * Returns value read from PHY register
  128. *
  129. * spider_net_write_phy reads from an arbitrary PHY
  130. * register via the spider GPCROPCMD register
  131. **/
  132. static int
  133. spider_net_read_phy(struct net_device *netdev, int mii_id, int reg)
  134. {
  135. struct spider_net_card *card = netdev_priv(netdev);
  136. u32 readvalue;
  137. readvalue = ((u32)mii_id << 21) | ((u32)reg << 16);
  138. spider_net_write_reg(card, SPIDER_NET_GPCROPCMD, readvalue);
  139. /* we don't use semaphores to wait for an SPIDER_NET_GPROPCMPINT
  140. * interrupt, as we poll for the completion of the read operation
  141. * in spider_net_read_phy. Should take about 50 us */
  142. do {
  143. readvalue = spider_net_read_reg(card, SPIDER_NET_GPCROPCMD);
  144. } while (readvalue & SPIDER_NET_GPREXEC);
  145. readvalue &= SPIDER_NET_GPRDAT_MASK;
  146. return readvalue;
  147. }
  148. /**
  149. * spider_net_rx_irq_off - switch off rx irq on this spider card
  150. * @card: device structure
  151. *
  152. * switches off rx irq by masking them out in the GHIINTnMSK register
  153. */
  154. static void
  155. spider_net_rx_irq_off(struct spider_net_card *card)
  156. {
  157. u32 regvalue;
  158. regvalue = SPIDER_NET_INT0_MASK_VALUE & (~SPIDER_NET_RXINT);
  159. spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK, regvalue);
  160. }
  161. /**
  162. * spider_net_rx_irq_on - switch on rx irq on this spider card
  163. * @card: device structure
  164. *
  165. * switches on rx irq by enabling them in the GHIINTnMSK register
  166. */
  167. static void
  168. spider_net_rx_irq_on(struct spider_net_card *card)
  169. {
  170. u32 regvalue;
  171. regvalue = SPIDER_NET_INT0_MASK_VALUE | SPIDER_NET_RXINT;
  172. spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK, regvalue);
  173. }
  174. /**
  175. * spider_net_set_promisc - sets the unicast address or the promiscuous mode
  176. * @card: card structure
  177. *
  178. * spider_net_set_promisc sets the unicast destination address filter and
  179. * thus either allows for non-promisc mode or promisc mode
  180. */
  181. static void
  182. spider_net_set_promisc(struct spider_net_card *card)
  183. {
  184. u32 macu, macl;
  185. struct net_device *netdev = card->netdev;
  186. if (netdev->flags & IFF_PROMISC) {
  187. /* clear destination entry 0 */
  188. spider_net_write_reg(card, SPIDER_NET_GMRUAFILnR, 0);
  189. spider_net_write_reg(card, SPIDER_NET_GMRUAFILnR + 0x04, 0);
  190. spider_net_write_reg(card, SPIDER_NET_GMRUA0FIL15R,
  191. SPIDER_NET_PROMISC_VALUE);
  192. } else {
  193. macu = netdev->dev_addr[0];
  194. macu <<= 8;
  195. macu |= netdev->dev_addr[1];
  196. memcpy(&macl, &netdev->dev_addr[2], sizeof(macl));
  197. macu |= SPIDER_NET_UA_DESCR_VALUE;
  198. spider_net_write_reg(card, SPIDER_NET_GMRUAFILnR, macu);
  199. spider_net_write_reg(card, SPIDER_NET_GMRUAFILnR + 0x04, macl);
  200. spider_net_write_reg(card, SPIDER_NET_GMRUA0FIL15R,
  201. SPIDER_NET_NONPROMISC_VALUE);
  202. }
  203. }
  204. /**
  205. * spider_net_get_mac_address - read mac address from spider card
  206. * @card: device structure
  207. *
  208. * reads MAC address from GMACUNIMACU and GMACUNIMACL registers
  209. */
  210. static int
  211. spider_net_get_mac_address(struct net_device *netdev)
  212. {
  213. struct spider_net_card *card = netdev_priv(netdev);
  214. u32 macl, macu;
  215. macl = spider_net_read_reg(card, SPIDER_NET_GMACUNIMACL);
  216. macu = spider_net_read_reg(card, SPIDER_NET_GMACUNIMACU);
  217. netdev->dev_addr[0] = (macu >> 24) & 0xff;
  218. netdev->dev_addr[1] = (macu >> 16) & 0xff;
  219. netdev->dev_addr[2] = (macu >> 8) & 0xff;
  220. netdev->dev_addr[3] = macu & 0xff;
  221. netdev->dev_addr[4] = (macl >> 8) & 0xff;
  222. netdev->dev_addr[5] = macl & 0xff;
  223. if (!is_valid_ether_addr(&netdev->dev_addr[0]))
  224. return -EINVAL;
  225. return 0;
  226. }
  227. /**
  228. * spider_net_get_descr_status -- returns the status of a descriptor
  229. * @descr: descriptor to look at
  230. *
  231. * returns the status as in the dmac_cmd_status field of the descriptor
  232. */
  233. static inline int
  234. spider_net_get_descr_status(struct spider_net_descr *descr)
  235. {
  236. return descr->dmac_cmd_status & SPIDER_NET_DESCR_IND_PROC_MASK;
  237. }
  238. /**
  239. * spider_net_free_chain - free descriptor chain
  240. * @card: card structure
  241. * @chain: address of chain
  242. *
  243. */
  244. static void
  245. spider_net_free_chain(struct spider_net_card *card,
  246. struct spider_net_descr_chain *chain)
  247. {
  248. struct spider_net_descr *descr;
  249. descr = chain->ring;
  250. do {
  251. descr->bus_addr = 0;
  252. descr->next_descr_addr = 0;
  253. descr = descr->next;
  254. } while (descr != chain->ring);
  255. dma_free_coherent(&card->pdev->dev, chain->num_desc,
  256. chain->ring, chain->dma_addr);
  257. }
  258. /**
  259. * spider_net_init_chain - alloc and link descriptor chain
  260. * @card: card structure
  261. * @chain: address of chain
  262. *
  263. * We manage a circular list that mirrors the hardware structure,
  264. * except that the hardware uses bus addresses.
  265. *
  266. * Returns 0 on success, <0 on failure
  267. */
  268. static int
  269. spider_net_init_chain(struct spider_net_card *card,
  270. struct spider_net_descr_chain *chain)
  271. {
  272. int i;
  273. struct spider_net_descr *descr;
  274. dma_addr_t buf;
  275. size_t alloc_size;
  276. alloc_size = chain->num_desc * sizeof (struct spider_net_descr);
  277. chain->ring = dma_alloc_coherent(&card->pdev->dev, alloc_size,
  278. &chain->dma_addr, GFP_KERNEL);
  279. if (!chain->ring)
  280. return -ENOMEM;
  281. descr = chain->ring;
  282. memset(descr, 0, alloc_size);
  283. /* Set up the hardware pointers in each descriptor */
  284. buf = chain->dma_addr;
  285. for (i=0; i < chain->num_desc; i++, descr++) {
  286. descr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE;
  287. descr->bus_addr = buf;
  288. descr->next_descr_addr = 0;
  289. descr->next = descr + 1;
  290. descr->prev = descr - 1;
  291. buf += sizeof(struct spider_net_descr);
  292. }
  293. /* do actual circular list */
  294. (descr-1)->next = chain->ring;
  295. chain->ring->prev = descr-1;
  296. spin_lock_init(&chain->lock);
  297. chain->head = chain->ring;
  298. chain->tail = chain->ring;
  299. return 0;
  300. }
  301. /**
  302. * spider_net_free_rx_chain_contents - frees descr contents in rx chain
  303. * @card: card structure
  304. *
  305. * returns 0 on success, <0 on failure
  306. */
  307. static void
  308. spider_net_free_rx_chain_contents(struct spider_net_card *card)
  309. {
  310. struct spider_net_descr *descr;
  311. descr = card->rx_chain.head;
  312. do {
  313. if (descr->skb) {
  314. dev_kfree_skb(descr->skb);
  315. pci_unmap_single(card->pdev, descr->buf_addr,
  316. SPIDER_NET_MAX_FRAME,
  317. PCI_DMA_BIDIRECTIONAL);
  318. }
  319. descr = descr->next;
  320. } while (descr != card->rx_chain.head);
  321. }
  322. /**
  323. * spider_net_prepare_rx_descr - Reinitialize RX descriptor
  324. * @card: card structure
  325. * @descr: descriptor to re-init
  326. *
  327. * Return 0 on succes, <0 on failure.
  328. *
  329. * Allocates a new rx skb, iommu-maps it and attaches it to the
  330. * descriptor. Mark the descriptor as activated, ready-to-use.
  331. */
  332. static int
  333. spider_net_prepare_rx_descr(struct spider_net_card *card,
  334. struct spider_net_descr *descr)
  335. {
  336. dma_addr_t buf;
  337. int offset;
  338. int bufsize;
  339. /* we need to round up the buffer size to a multiple of 128 */
  340. bufsize = (SPIDER_NET_MAX_FRAME + SPIDER_NET_RXBUF_ALIGN - 1) &
  341. (~(SPIDER_NET_RXBUF_ALIGN - 1));
  342. /* and we need to have it 128 byte aligned, therefore we allocate a
  343. * bit more */
  344. /* allocate an skb */
  345. descr->skb = dev_alloc_skb(bufsize + SPIDER_NET_RXBUF_ALIGN - 1);
  346. if (!descr->skb) {
  347. if (netif_msg_rx_err(card) && net_ratelimit())
  348. pr_err("Not enough memory to allocate rx buffer\n");
  349. card->spider_stats.alloc_rx_skb_error++;
  350. return -ENOMEM;
  351. }
  352. descr->buf_size = bufsize;
  353. descr->result_size = 0;
  354. descr->valid_size = 0;
  355. descr->data_status = 0;
  356. descr->data_error = 0;
  357. offset = ((unsigned long)descr->skb->data) &
  358. (SPIDER_NET_RXBUF_ALIGN - 1);
  359. if (offset)
  360. skb_reserve(descr->skb, SPIDER_NET_RXBUF_ALIGN - offset);
  361. /* iommu-map the skb */
  362. buf = pci_map_single(card->pdev, descr->skb->data,
  363. SPIDER_NET_MAX_FRAME, PCI_DMA_FROMDEVICE);
  364. descr->buf_addr = buf;
  365. if (pci_dma_mapping_error(buf)) {
  366. dev_kfree_skb_any(descr->skb);
  367. if (netif_msg_rx_err(card) && net_ratelimit())
  368. pr_err("Could not iommu-map rx buffer\n");
  369. card->spider_stats.rx_iommu_map_error++;
  370. descr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE;
  371. } else {
  372. descr->next_descr_addr = 0;
  373. wmb();
  374. descr->dmac_cmd_status = SPIDER_NET_DESCR_CARDOWNED |
  375. SPIDER_NET_DMAC_NOINTR_COMPLETE;
  376. wmb();
  377. descr->prev->next_descr_addr = descr->bus_addr;
  378. }
  379. return 0;
  380. }
  381. /**
  382. * spider_net_enable_rxchtails - sets RX dmac chain tail addresses
  383. * @card: card structure
  384. *
  385. * spider_net_enable_rxchtails sets the RX DMAC chain tail adresses in the
  386. * chip by writing to the appropriate register. DMA is enabled in
  387. * spider_net_enable_rxdmac.
  388. */
  389. static inline void
  390. spider_net_enable_rxchtails(struct spider_net_card *card)
  391. {
  392. /* assume chain is aligned correctly */
  393. spider_net_write_reg(card, SPIDER_NET_GDADCHA ,
  394. card->rx_chain.tail->bus_addr);
  395. }
  396. /**
  397. * spider_net_enable_rxdmac - enables a receive DMA controller
  398. * @card: card structure
  399. *
  400. * spider_net_enable_rxdmac enables the DMA controller by setting RX_DMA_EN
  401. * in the GDADMACCNTR register
  402. */
  403. static inline void
  404. spider_net_enable_rxdmac(struct spider_net_card *card)
  405. {
  406. wmb();
  407. spider_net_write_reg(card, SPIDER_NET_GDADMACCNTR,
  408. SPIDER_NET_DMA_RX_VALUE);
  409. }
  410. /**
  411. * spider_net_refill_rx_chain - refills descriptors/skbs in the rx chains
  412. * @card: card structure
  413. *
  414. * refills descriptors in the rx chain: allocates skbs and iommu-maps them.
  415. */
  416. static void
  417. spider_net_refill_rx_chain(struct spider_net_card *card)
  418. {
  419. struct spider_net_descr_chain *chain = &card->rx_chain;
  420. unsigned long flags;
  421. /* one context doing the refill (and a second context seeing that
  422. * and omitting it) is ok. If called by NAPI, we'll be called again
  423. * as spider_net_decode_one_descr is called several times. If some
  424. * interrupt calls us, the NAPI is about to clean up anyway. */
  425. if (!spin_trylock_irqsave(&chain->lock, flags))
  426. return;
  427. while (spider_net_get_descr_status(chain->head) ==
  428. SPIDER_NET_DESCR_NOT_IN_USE) {
  429. if (spider_net_prepare_rx_descr(card, chain->head))
  430. break;
  431. chain->head = chain->head->next;
  432. }
  433. spin_unlock_irqrestore(&chain->lock, flags);
  434. }
  435. /**
  436. * spider_net_alloc_rx_skbs - Allocates rx skbs in rx descriptor chains
  437. * @card: card structure
  438. *
  439. * Returns 0 on success, <0 on failure.
  440. */
  441. static int
  442. spider_net_alloc_rx_skbs(struct spider_net_card *card)
  443. {
  444. int result;
  445. struct spider_net_descr_chain *chain;
  446. result = -ENOMEM;
  447. chain = &card->rx_chain;
  448. /* Put at least one buffer into the chain. if this fails,
  449. * we've got a problem. If not, spider_net_refill_rx_chain
  450. * will do the rest at the end of this function. */
  451. if (spider_net_prepare_rx_descr(card, chain->head))
  452. goto error;
  453. else
  454. chain->head = chain->head->next;
  455. /* This will allocate the rest of the rx buffers;
  456. * if not, it's business as usual later on. */
  457. spider_net_refill_rx_chain(card);
  458. spider_net_enable_rxdmac(card);
  459. return 0;
  460. error:
  461. spider_net_free_rx_chain_contents(card);
  462. return result;
  463. }
  464. /**
  465. * spider_net_get_multicast_hash - generates hash for multicast filter table
  466. * @addr: multicast address
  467. *
  468. * returns the hash value.
  469. *
  470. * spider_net_get_multicast_hash calculates a hash value for a given multicast
  471. * address, that is used to set the multicast filter tables
  472. */
  473. static u8
  474. spider_net_get_multicast_hash(struct net_device *netdev, __u8 *addr)
  475. {
  476. u32 crc;
  477. u8 hash;
  478. char addr_for_crc[ETH_ALEN] = { 0, };
  479. int i, bit;
  480. for (i = 0; i < ETH_ALEN * 8; i++) {
  481. bit = (addr[i / 8] >> (i % 8)) & 1;
  482. addr_for_crc[ETH_ALEN - 1 - i / 8] += bit << (7 - (i % 8));
  483. }
  484. crc = crc32_be(~0, addr_for_crc, netdev->addr_len);
  485. hash = (crc >> 27);
  486. hash <<= 3;
  487. hash |= crc & 7;
  488. hash &= 0xff;
  489. return hash;
  490. }
  491. /**
  492. * spider_net_set_multi - sets multicast addresses and promisc flags
  493. * @netdev: interface device structure
  494. *
  495. * spider_net_set_multi configures multicast addresses as needed for the
  496. * netdev interface. It also sets up multicast, allmulti and promisc
  497. * flags appropriately
  498. */
  499. static void
  500. spider_net_set_multi(struct net_device *netdev)
  501. {
  502. struct dev_mc_list *mc;
  503. u8 hash;
  504. int i;
  505. u32 reg;
  506. struct spider_net_card *card = netdev_priv(netdev);
  507. unsigned long bitmask[SPIDER_NET_MULTICAST_HASHES / BITS_PER_LONG] =
  508. {0, };
  509. spider_net_set_promisc(card);
  510. if (netdev->flags & IFF_ALLMULTI) {
  511. for (i = 0; i < SPIDER_NET_MULTICAST_HASHES; i++) {
  512. set_bit(i, bitmask);
  513. }
  514. goto write_hash;
  515. }
  516. /* well, we know, what the broadcast hash value is: it's xfd
  517. hash = spider_net_get_multicast_hash(netdev, netdev->broadcast); */
  518. set_bit(0xfd, bitmask);
  519. for (mc = netdev->mc_list; mc; mc = mc->next) {
  520. hash = spider_net_get_multicast_hash(netdev, mc->dmi_addr);
  521. set_bit(hash, bitmask);
  522. }
  523. write_hash:
  524. for (i = 0; i < SPIDER_NET_MULTICAST_HASHES / 4; i++) {
  525. reg = 0;
  526. if (test_bit(i * 4, bitmask))
  527. reg += 0x08;
  528. reg <<= 8;
  529. if (test_bit(i * 4 + 1, bitmask))
  530. reg += 0x08;
  531. reg <<= 8;
  532. if (test_bit(i * 4 + 2, bitmask))
  533. reg += 0x08;
  534. reg <<= 8;
  535. if (test_bit(i * 4 + 3, bitmask))
  536. reg += 0x08;
  537. spider_net_write_reg(card, SPIDER_NET_GMRMHFILnR + i * 4, reg);
  538. }
  539. }
  540. /**
  541. * spider_net_disable_rxdmac - disables the receive DMA controller
  542. * @card: card structure
  543. *
  544. * spider_net_disable_rxdmac terminates processing on the DMA controller by
  545. * turing off DMA and issueing a force end
  546. */
  547. static void
  548. spider_net_disable_rxdmac(struct spider_net_card *card)
  549. {
  550. spider_net_write_reg(card, SPIDER_NET_GDADMACCNTR,
  551. SPIDER_NET_DMA_RX_FEND_VALUE);
  552. }
  553. /**
  554. * spider_net_prepare_tx_descr - fill tx descriptor with skb data
  555. * @card: card structure
  556. * @descr: descriptor structure to fill out
  557. * @skb: packet to use
  558. *
  559. * returns 0 on success, <0 on failure.
  560. *
  561. * fills out the descriptor structure with skb data and len. Copies data,
  562. * if needed (32bit DMA!)
  563. */
  564. static int
  565. spider_net_prepare_tx_descr(struct spider_net_card *card,
  566. struct sk_buff *skb)
  567. {
  568. struct spider_net_descr *descr;
  569. dma_addr_t buf;
  570. unsigned long flags;
  571. buf = pci_map_single(card->pdev, skb->data, skb->len, PCI_DMA_TODEVICE);
  572. if (pci_dma_mapping_error(buf)) {
  573. if (netif_msg_tx_err(card) && net_ratelimit())
  574. pr_err("could not iommu-map packet (%p, %i). "
  575. "Dropping packet\n", skb->data, skb->len);
  576. card->spider_stats.tx_iommu_map_error++;
  577. return -ENOMEM;
  578. }
  579. spin_lock_irqsave(&card->tx_chain.lock, flags);
  580. descr = card->tx_chain.head;
  581. card->tx_chain.head = descr->next;
  582. descr->buf_addr = buf;
  583. descr->buf_size = skb->len;
  584. descr->next_descr_addr = 0;
  585. descr->skb = skb;
  586. descr->data_status = 0;
  587. descr->dmac_cmd_status =
  588. SPIDER_NET_DESCR_CARDOWNED | SPIDER_NET_DMAC_NOCS;
  589. spin_unlock_irqrestore(&card->tx_chain.lock, flags);
  590. if (skb->protocol == htons(ETH_P_IP))
  591. switch (skb->nh.iph->protocol) {
  592. case IPPROTO_TCP:
  593. descr->dmac_cmd_status |= SPIDER_NET_DMAC_TCP;
  594. break;
  595. case IPPROTO_UDP:
  596. descr->dmac_cmd_status |= SPIDER_NET_DMAC_UDP;
  597. break;
  598. }
  599. /* Chain the bus address, so that the DMA engine finds this descr. */
  600. descr->prev->next_descr_addr = descr->bus_addr;
  601. card->netdev->trans_start = jiffies; /* set netdev watchdog timer */
  602. return 0;
  603. }
  604. static int
  605. spider_net_set_low_watermark(struct spider_net_card *card)
  606. {
  607. unsigned long flags;
  608. int status;
  609. int cnt=0;
  610. int i;
  611. struct spider_net_descr *descr = card->tx_chain.tail;
  612. /* Measure the length of the queue. Measurement does not
  613. * need to be precise -- does not need a lock. */
  614. while (descr != card->tx_chain.head) {
  615. status = descr->dmac_cmd_status & SPIDER_NET_DESCR_NOT_IN_USE;
  616. if (status == SPIDER_NET_DESCR_NOT_IN_USE)
  617. break;
  618. descr = descr->next;
  619. cnt++;
  620. }
  621. /* If TX queue is short, don't even bother with interrupts */
  622. if (cnt < card->tx_chain.num_desc/4)
  623. return cnt;
  624. /* Set low-watermark 3/4th's of the way into the queue. */
  625. descr = card->tx_chain.tail;
  626. cnt = (cnt*3)/4;
  627. for (i=0;i<cnt; i++)
  628. descr = descr->next;
  629. /* Set the new watermark, clear the old watermark */
  630. spin_lock_irqsave(&card->tx_chain.lock, flags);
  631. descr->dmac_cmd_status |= SPIDER_NET_DESCR_TXDESFLG;
  632. if (card->low_watermark && card->low_watermark != descr)
  633. card->low_watermark->dmac_cmd_status =
  634. card->low_watermark->dmac_cmd_status & ~SPIDER_NET_DESCR_TXDESFLG;
  635. card->low_watermark = descr;
  636. spin_unlock_irqrestore(&card->tx_chain.lock, flags);
  637. return cnt;
  638. }
  639. /**
  640. * spider_net_release_tx_chain - processes sent tx descriptors
  641. * @card: adapter structure
  642. * @brutal: if set, don't care about whether descriptor seems to be in use
  643. *
  644. * returns 0 if the tx ring is empty, otherwise 1.
  645. *
  646. * spider_net_release_tx_chain releases the tx descriptors that spider has
  647. * finished with (if non-brutal) or simply release tx descriptors (if brutal).
  648. * If some other context is calling this function, we return 1 so that we're
  649. * scheduled again (if we were scheduled) and will not loose initiative.
  650. */
  651. static int
  652. spider_net_release_tx_chain(struct spider_net_card *card, int brutal)
  653. {
  654. struct spider_net_descr_chain *chain = &card->tx_chain;
  655. struct spider_net_descr *descr;
  656. struct sk_buff *skb;
  657. u32 buf_addr;
  658. unsigned long flags;
  659. int status;
  660. while (chain->tail != chain->head) {
  661. spin_lock_irqsave(&chain->lock, flags);
  662. descr = chain->tail;
  663. status = spider_net_get_descr_status(descr);
  664. switch (status) {
  665. case SPIDER_NET_DESCR_COMPLETE:
  666. card->netdev_stats.tx_packets++;
  667. card->netdev_stats.tx_bytes += descr->skb->len;
  668. break;
  669. case SPIDER_NET_DESCR_CARDOWNED:
  670. if (!brutal) {
  671. spin_unlock_irqrestore(&chain->lock, flags);
  672. return 1;
  673. }
  674. /* fallthrough, if we release the descriptors
  675. * brutally (then we don't care about
  676. * SPIDER_NET_DESCR_CARDOWNED) */
  677. case SPIDER_NET_DESCR_RESPONSE_ERROR:
  678. case SPIDER_NET_DESCR_PROTECTION_ERROR:
  679. case SPIDER_NET_DESCR_FORCE_END:
  680. if (netif_msg_tx_err(card))
  681. pr_err("%s: forcing end of tx descriptor "
  682. "with status x%02x\n",
  683. card->netdev->name, status);
  684. card->netdev_stats.tx_errors++;
  685. break;
  686. default:
  687. card->netdev_stats.tx_dropped++;
  688. if (!brutal) {
  689. spin_unlock_irqrestore(&chain->lock, flags);
  690. return 1;
  691. }
  692. }
  693. chain->tail = descr->next;
  694. descr->dmac_cmd_status |= SPIDER_NET_DESCR_NOT_IN_USE;
  695. skb = descr->skb;
  696. buf_addr = descr->buf_addr;
  697. spin_unlock_irqrestore(&chain->lock, flags);
  698. /* unmap the skb */
  699. if (skb) {
  700. pci_unmap_single(card->pdev, buf_addr, skb->len,
  701. PCI_DMA_TODEVICE);
  702. dev_kfree_skb(skb);
  703. }
  704. }
  705. return 0;
  706. }
  707. /**
  708. * spider_net_kick_tx_dma - enables TX DMA processing
  709. * @card: card structure
  710. * @descr: descriptor address to enable TX processing at
  711. *
  712. * This routine will start the transmit DMA running if
  713. * it is not already running. This routine ned only be
  714. * called when queueing a new packet to an empty tx queue.
  715. * Writes the current tx chain head as start address
  716. * of the tx descriptor chain and enables the transmission
  717. * DMA engine.
  718. */
  719. static inline void
  720. spider_net_kick_tx_dma(struct spider_net_card *card)
  721. {
  722. struct spider_net_descr *descr;
  723. if (spider_net_read_reg(card, SPIDER_NET_GDTDMACCNTR) &
  724. SPIDER_NET_TX_DMA_EN)
  725. goto out;
  726. descr = card->tx_chain.tail;
  727. for (;;) {
  728. if (spider_net_get_descr_status(descr) ==
  729. SPIDER_NET_DESCR_CARDOWNED) {
  730. spider_net_write_reg(card, SPIDER_NET_GDTDCHA,
  731. descr->bus_addr);
  732. spider_net_write_reg(card, SPIDER_NET_GDTDMACCNTR,
  733. SPIDER_NET_DMA_TX_VALUE);
  734. break;
  735. }
  736. if (descr == card->tx_chain.head)
  737. break;
  738. descr = descr->next;
  739. }
  740. out:
  741. mod_timer(&card->tx_timer, jiffies + SPIDER_NET_TX_TIMER);
  742. }
  743. /**
  744. * spider_net_xmit - transmits a frame over the device
  745. * @skb: packet to send out
  746. * @netdev: interface device structure
  747. *
  748. * returns 0 on success, !0 on failure
  749. */
  750. static int
  751. spider_net_xmit(struct sk_buff *skb, struct net_device *netdev)
  752. {
  753. int cnt;
  754. struct spider_net_card *card = netdev_priv(netdev);
  755. struct spider_net_descr_chain *chain = &card->tx_chain;
  756. spider_net_release_tx_chain(card, 0);
  757. if ((chain->head->next == chain->tail->prev) ||
  758. (spider_net_prepare_tx_descr(card, skb) != 0)) {
  759. card->netdev_stats.tx_dropped++;
  760. netif_stop_queue(netdev);
  761. return NETDEV_TX_BUSY;
  762. }
  763. cnt = spider_net_set_low_watermark(card);
  764. if (cnt < 5)
  765. spider_net_kick_tx_dma(card);
  766. return NETDEV_TX_OK;
  767. }
  768. /**
  769. * spider_net_cleanup_tx_ring - cleans up the TX ring
  770. * @card: card structure
  771. *
  772. * spider_net_cleanup_tx_ring is called by either the tx_timer
  773. * or from the NAPI polling routine.
  774. * This routine releases resources associted with transmitted
  775. * packets, including updating the queue tail pointer.
  776. */
  777. static void
  778. spider_net_cleanup_tx_ring(struct spider_net_card *card)
  779. {
  780. if ((spider_net_release_tx_chain(card, 0) != 0) &&
  781. (card->netdev->flags & IFF_UP)) {
  782. spider_net_kick_tx_dma(card);
  783. netif_wake_queue(card->netdev);
  784. }
  785. }
  786. /**
  787. * spider_net_do_ioctl - called for device ioctls
  788. * @netdev: interface device structure
  789. * @ifr: request parameter structure for ioctl
  790. * @cmd: command code for ioctl
  791. *
  792. * returns 0 on success, <0 on failure. Currently, we have no special ioctls.
  793. * -EOPNOTSUPP is returned, if an unknown ioctl was requested
  794. */
  795. static int
  796. spider_net_do_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
  797. {
  798. switch (cmd) {
  799. default:
  800. return -EOPNOTSUPP;
  801. }
  802. }
  803. /**
  804. * spider_net_pass_skb_up - takes an skb from a descriptor and passes it on
  805. * @descr: descriptor to process
  806. * @card: card structure
  807. *
  808. * Fills out skb structure and passes the data to the stack.
  809. * The descriptor state is not changed.
  810. */
  811. static void
  812. spider_net_pass_skb_up(struct spider_net_descr *descr,
  813. struct spider_net_card *card)
  814. {
  815. struct sk_buff *skb;
  816. struct net_device *netdev;
  817. u32 data_status, data_error;
  818. data_status = descr->data_status;
  819. data_error = descr->data_error;
  820. netdev = card->netdev;
  821. skb = descr->skb;
  822. skb->dev = netdev;
  823. skb_put(skb, descr->valid_size);
  824. /* the card seems to add 2 bytes of junk in front
  825. * of the ethernet frame */
  826. #define SPIDER_MISALIGN 2
  827. skb_pull(skb, SPIDER_MISALIGN);
  828. skb->protocol = eth_type_trans(skb, netdev);
  829. /* checksum offload */
  830. if (card->options.rx_csum) {
  831. if ( ( (data_status & SPIDER_NET_DATA_STATUS_CKSUM_MASK) ==
  832. SPIDER_NET_DATA_STATUS_CKSUM_MASK) &&
  833. !(data_error & SPIDER_NET_DATA_ERR_CKSUM_MASK))
  834. skb->ip_summed = CHECKSUM_UNNECESSARY;
  835. else
  836. skb->ip_summed = CHECKSUM_NONE;
  837. } else
  838. skb->ip_summed = CHECKSUM_NONE;
  839. if (data_status & SPIDER_NET_VLAN_PACKET) {
  840. /* further enhancements: HW-accel VLAN
  841. * vlan_hwaccel_receive_skb
  842. */
  843. }
  844. /* pass skb up to stack */
  845. netif_receive_skb(skb);
  846. /* update netdevice statistics */
  847. card->netdev_stats.rx_packets++;
  848. card->netdev_stats.rx_bytes += skb->len;
  849. }
  850. #ifdef DEBUG
  851. static void show_rx_chain(struct spider_net_card *card)
  852. {
  853. struct spider_net_descr_chain *chain = &card->rx_chain;
  854. struct spider_net_descr *start= chain->tail;
  855. struct spider_net_descr *descr= start;
  856. int status;
  857. int cnt = 0;
  858. int cstat = spider_net_get_descr_status(descr);
  859. printk(KERN_INFO "RX chain tail at descr=%ld\n",
  860. (start - card->descr) - card->tx_chain.num_desc);
  861. status = cstat;
  862. do
  863. {
  864. status = spider_net_get_descr_status(descr);
  865. if (cstat != status) {
  866. printk(KERN_INFO "Have %d descrs with stat=x%08x\n", cnt, cstat);
  867. cstat = status;
  868. cnt = 0;
  869. }
  870. cnt ++;
  871. descr = descr->next;
  872. } while (descr != start);
  873. printk(KERN_INFO "Last %d descrs with stat=x%08x\n", cnt, cstat);
  874. }
  875. #endif
  876. /**
  877. * spider_net_decode_one_descr - processes an rx descriptor
  878. * @card: card structure
  879. *
  880. * Returns 1 if a packet has been sent to the stack, otherwise 0
  881. *
  882. * Processes an rx descriptor by iommu-unmapping the data buffer and passing
  883. * the packet up to the stack. This function is called in softirq
  884. * context, e.g. either bottom half from interrupt or NAPI polling context
  885. */
  886. static int
  887. spider_net_decode_one_descr(struct spider_net_card *card)
  888. {
  889. struct spider_net_descr_chain *chain = &card->rx_chain;
  890. struct spider_net_descr *descr = chain->tail;
  891. int status;
  892. status = spider_net_get_descr_status(descr);
  893. /* Nothing in the descriptor, or ring must be empty */
  894. if ((status == SPIDER_NET_DESCR_CARDOWNED) ||
  895. (status == SPIDER_NET_DESCR_NOT_IN_USE))
  896. return 0;
  897. /* descriptor definitively used -- move on tail */
  898. chain->tail = descr->next;
  899. /* unmap descriptor */
  900. pci_unmap_single(card->pdev, descr->buf_addr,
  901. SPIDER_NET_MAX_FRAME, PCI_DMA_FROMDEVICE);
  902. if ( (status == SPIDER_NET_DESCR_RESPONSE_ERROR) ||
  903. (status == SPIDER_NET_DESCR_PROTECTION_ERROR) ||
  904. (status == SPIDER_NET_DESCR_FORCE_END) ) {
  905. if (netif_msg_rx_err(card))
  906. pr_err("%s: dropping RX descriptor with state %d\n",
  907. card->netdev->name, status);
  908. card->netdev_stats.rx_dropped++;
  909. goto bad_desc;
  910. }
  911. if ( (status != SPIDER_NET_DESCR_COMPLETE) &&
  912. (status != SPIDER_NET_DESCR_FRAME_END) ) {
  913. if (netif_msg_rx_err(card))
  914. pr_err("%s: RX descriptor with unkown state %d\n",
  915. card->netdev->name, status);
  916. card->spider_stats.rx_desc_unk_state++;
  917. goto bad_desc;
  918. }
  919. /* The cases we'll throw away the packet immediately */
  920. if (descr->data_error & SPIDER_NET_DESTROY_RX_FLAGS) {
  921. if (netif_msg_rx_err(card))
  922. pr_err("%s: error in received descriptor found, "
  923. "data_status=x%08x, data_error=x%08x\n",
  924. card->netdev->name,
  925. descr->data_status, descr->data_error);
  926. goto bad_desc;
  927. }
  928. if (descr->dmac_cmd_status & 0xfefe) {
  929. pr_err("%s: bad status, cmd_status=x%08x\n",
  930. card->netdev->name,
  931. descr->dmac_cmd_status);
  932. pr_err("buf_addr=x%08x\n", descr->buf_addr);
  933. pr_err("buf_size=x%08x\n", descr->buf_size);
  934. pr_err("next_descr_addr=x%08x\n", descr->next_descr_addr);
  935. pr_err("result_size=x%08x\n", descr->result_size);
  936. pr_err("valid_size=x%08x\n", descr->valid_size);
  937. pr_err("data_status=x%08x\n", descr->data_status);
  938. pr_err("data_error=x%08x\n", descr->data_error);
  939. pr_err("bus_addr=x%08x\n", descr->bus_addr);
  940. pr_err("which=%ld\n", descr - card->rx_chain.ring);
  941. card->spider_stats.rx_desc_error++;
  942. goto bad_desc;
  943. }
  944. /* Ok, we've got a packet in descr */
  945. spider_net_pass_skb_up(descr, card);
  946. descr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE;
  947. return 1;
  948. bad_desc:
  949. dev_kfree_skb_irq(descr->skb);
  950. descr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE;
  951. return 0;
  952. }
  953. /**
  954. * spider_net_poll - NAPI poll function called by the stack to return packets
  955. * @netdev: interface device structure
  956. * @budget: number of packets we can pass to the stack at most
  957. *
  958. * returns 0 if no more packets available to the driver/stack. Returns 1,
  959. * if the quota is exceeded, but the driver has still packets.
  960. *
  961. * spider_net_poll returns all packets from the rx descriptors to the stack
  962. * (using netif_receive_skb). If all/enough packets are up, the driver
  963. * reenables interrupts and returns 0. If not, 1 is returned.
  964. */
  965. static int
  966. spider_net_poll(struct net_device *netdev, int *budget)
  967. {
  968. struct spider_net_card *card = netdev_priv(netdev);
  969. int packets_to_do, packets_done = 0;
  970. int no_more_packets = 0;
  971. spider_net_cleanup_tx_ring(card);
  972. packets_to_do = min(*budget, netdev->quota);
  973. while (packets_to_do) {
  974. if (spider_net_decode_one_descr(card)) {
  975. packets_done++;
  976. packets_to_do--;
  977. } else {
  978. /* no more packets for the stack */
  979. no_more_packets = 1;
  980. break;
  981. }
  982. }
  983. netdev->quota -= packets_done;
  984. *budget -= packets_done;
  985. spider_net_refill_rx_chain(card);
  986. spider_net_enable_rxdmac(card);
  987. /* if all packets are in the stack, enable interrupts and return 0 */
  988. /* if not, return 1 */
  989. if (no_more_packets) {
  990. netif_rx_complete(netdev);
  991. spider_net_rx_irq_on(card);
  992. return 0;
  993. }
  994. return 1;
  995. }
  996. /**
  997. * spider_net_vlan_rx_reg - initializes VLAN structures in the driver and card
  998. * @netdev: interface device structure
  999. * @grp: vlan_group structure that is registered (NULL on destroying interface)
  1000. */
  1001. static void
  1002. spider_net_vlan_rx_reg(struct net_device *netdev, struct vlan_group *grp)
  1003. {
  1004. /* further enhancement... yet to do */
  1005. return;
  1006. }
  1007. /**
  1008. * spider_net_vlan_rx_add - adds VLAN id to the card filter
  1009. * @netdev: interface device structure
  1010. * @vid: VLAN id to add
  1011. */
  1012. static void
  1013. spider_net_vlan_rx_add(struct net_device *netdev, uint16_t vid)
  1014. {
  1015. /* further enhancement... yet to do */
  1016. /* add vid to card's VLAN filter table */
  1017. return;
  1018. }
  1019. /**
  1020. * spider_net_vlan_rx_kill - removes VLAN id to the card filter
  1021. * @netdev: interface device structure
  1022. * @vid: VLAN id to remove
  1023. */
  1024. static void
  1025. spider_net_vlan_rx_kill(struct net_device *netdev, uint16_t vid)
  1026. {
  1027. /* further enhancement... yet to do */
  1028. /* remove vid from card's VLAN filter table */
  1029. }
  1030. /**
  1031. * spider_net_get_stats - get interface statistics
  1032. * @netdev: interface device structure
  1033. *
  1034. * returns the interface statistics residing in the spider_net_card struct
  1035. */
  1036. static struct net_device_stats *
  1037. spider_net_get_stats(struct net_device *netdev)
  1038. {
  1039. struct spider_net_card *card = netdev_priv(netdev);
  1040. struct net_device_stats *stats = &card->netdev_stats;
  1041. return stats;
  1042. }
  1043. /**
  1044. * spider_net_change_mtu - changes the MTU of an interface
  1045. * @netdev: interface device structure
  1046. * @new_mtu: new MTU value
  1047. *
  1048. * returns 0 on success, <0 on failure
  1049. */
  1050. static int
  1051. spider_net_change_mtu(struct net_device *netdev, int new_mtu)
  1052. {
  1053. /* no need to re-alloc skbs or so -- the max mtu is about 2.3k
  1054. * and mtu is outbound only anyway */
  1055. if ( (new_mtu < SPIDER_NET_MIN_MTU ) ||
  1056. (new_mtu > SPIDER_NET_MAX_MTU) )
  1057. return -EINVAL;
  1058. netdev->mtu = new_mtu;
  1059. return 0;
  1060. }
  1061. /**
  1062. * spider_net_set_mac - sets the MAC of an interface
  1063. * @netdev: interface device structure
  1064. * @ptr: pointer to new MAC address
  1065. *
  1066. * Returns 0 on success, <0 on failure. Currently, we don't support this
  1067. * and will always return EOPNOTSUPP.
  1068. */
  1069. static int
  1070. spider_net_set_mac(struct net_device *netdev, void *p)
  1071. {
  1072. struct spider_net_card *card = netdev_priv(netdev);
  1073. u32 macl, macu, regvalue;
  1074. struct sockaddr *addr = p;
  1075. if (!is_valid_ether_addr(addr->sa_data))
  1076. return -EADDRNOTAVAIL;
  1077. /* switch off GMACTPE and GMACRPE */
  1078. regvalue = spider_net_read_reg(card, SPIDER_NET_GMACOPEMD);
  1079. regvalue &= ~((1 << 5) | (1 << 6));
  1080. spider_net_write_reg(card, SPIDER_NET_GMACOPEMD, regvalue);
  1081. /* write mac */
  1082. macu = (addr->sa_data[0]<<24) + (addr->sa_data[1]<<16) +
  1083. (addr->sa_data[2]<<8) + (addr->sa_data[3]);
  1084. macl = (addr->sa_data[4]<<8) + (addr->sa_data[5]);
  1085. spider_net_write_reg(card, SPIDER_NET_GMACUNIMACU, macu);
  1086. spider_net_write_reg(card, SPIDER_NET_GMACUNIMACL, macl);
  1087. /* switch GMACTPE and GMACRPE back on */
  1088. regvalue = spider_net_read_reg(card, SPIDER_NET_GMACOPEMD);
  1089. regvalue |= ((1 << 5) | (1 << 6));
  1090. spider_net_write_reg(card, SPIDER_NET_GMACOPEMD, regvalue);
  1091. spider_net_set_promisc(card);
  1092. /* look up, whether we have been successful */
  1093. if (spider_net_get_mac_address(netdev))
  1094. return -EADDRNOTAVAIL;
  1095. if (memcmp(netdev->dev_addr,addr->sa_data,netdev->addr_len))
  1096. return -EADDRNOTAVAIL;
  1097. return 0;
  1098. }
  1099. /**
  1100. * spider_net_handle_error_irq - handles errors raised by an interrupt
  1101. * @card: card structure
  1102. * @status_reg: interrupt status register 0 (GHIINT0STS)
  1103. *
  1104. * spider_net_handle_error_irq treats or ignores all error conditions
  1105. * found when an interrupt is presented
  1106. */
  1107. static void
  1108. spider_net_handle_error_irq(struct spider_net_card *card, u32 status_reg)
  1109. {
  1110. u32 error_reg1, error_reg2;
  1111. u32 i;
  1112. int show_error = 1;
  1113. error_reg1 = spider_net_read_reg(card, SPIDER_NET_GHIINT1STS);
  1114. error_reg2 = spider_net_read_reg(card, SPIDER_NET_GHIINT2STS);
  1115. /* check GHIINT0STS ************************************/
  1116. if (status_reg)
  1117. for (i = 0; i < 32; i++)
  1118. if (status_reg & (1<<i))
  1119. switch (i)
  1120. {
  1121. /* let error_reg1 and error_reg2 evaluation decide, what to do
  1122. case SPIDER_NET_PHYINT:
  1123. case SPIDER_NET_GMAC2INT:
  1124. case SPIDER_NET_GMAC1INT:
  1125. case SPIDER_NET_GFIFOINT:
  1126. case SPIDER_NET_DMACINT:
  1127. case SPIDER_NET_GSYSINT:
  1128. break; */
  1129. case SPIDER_NET_GIPSINT:
  1130. show_error = 0;
  1131. break;
  1132. case SPIDER_NET_GPWOPCMPINT:
  1133. /* PHY write operation completed */
  1134. show_error = 0;
  1135. break;
  1136. case SPIDER_NET_GPROPCMPINT:
  1137. /* PHY read operation completed */
  1138. /* we don't use semaphores, as we poll for the completion
  1139. * of the read operation in spider_net_read_phy. Should take
  1140. * about 50 us */
  1141. show_error = 0;
  1142. break;
  1143. case SPIDER_NET_GPWFFINT:
  1144. /* PHY command queue full */
  1145. if (netif_msg_intr(card))
  1146. pr_err("PHY write queue full\n");
  1147. show_error = 0;
  1148. break;
  1149. /* case SPIDER_NET_GRMDADRINT: not used. print a message */
  1150. /* case SPIDER_NET_GRMARPINT: not used. print a message */
  1151. /* case SPIDER_NET_GRMMPINT: not used. print a message */
  1152. case SPIDER_NET_GDTDEN0INT:
  1153. /* someone has set TX_DMA_EN to 0 */
  1154. show_error = 0;
  1155. break;
  1156. case SPIDER_NET_GDDDEN0INT: /* fallthrough */
  1157. case SPIDER_NET_GDCDEN0INT: /* fallthrough */
  1158. case SPIDER_NET_GDBDEN0INT: /* fallthrough */
  1159. case SPIDER_NET_GDADEN0INT:
  1160. /* someone has set RX_DMA_EN to 0 */
  1161. show_error = 0;
  1162. break;
  1163. /* RX interrupts */
  1164. case SPIDER_NET_GDDFDCINT:
  1165. case SPIDER_NET_GDCFDCINT:
  1166. case SPIDER_NET_GDBFDCINT:
  1167. case SPIDER_NET_GDAFDCINT:
  1168. /* case SPIDER_NET_GDNMINT: not used. print a message */
  1169. /* case SPIDER_NET_GCNMINT: not used. print a message */
  1170. /* case SPIDER_NET_GBNMINT: not used. print a message */
  1171. /* case SPIDER_NET_GANMINT: not used. print a message */
  1172. /* case SPIDER_NET_GRFNMINT: not used. print a message */
  1173. show_error = 0;
  1174. break;
  1175. /* TX interrupts */
  1176. case SPIDER_NET_GDTFDCINT:
  1177. show_error = 0;
  1178. break;
  1179. case SPIDER_NET_GTTEDINT:
  1180. show_error = 0;
  1181. break;
  1182. case SPIDER_NET_GDTDCEINT:
  1183. /* chain end. If a descriptor should be sent, kick off
  1184. * tx dma
  1185. if (card->tx_chain.tail != card->tx_chain.head)
  1186. spider_net_kick_tx_dma(card);
  1187. */
  1188. show_error = 0;
  1189. break;
  1190. /* case SPIDER_NET_G1TMCNTINT: not used. print a message */
  1191. /* case SPIDER_NET_GFREECNTINT: not used. print a message */
  1192. }
  1193. /* check GHIINT1STS ************************************/
  1194. if (error_reg1)
  1195. for (i = 0; i < 32; i++)
  1196. if (error_reg1 & (1<<i))
  1197. switch (i)
  1198. {
  1199. case SPIDER_NET_GTMFLLINT:
  1200. if (netif_msg_intr(card) && net_ratelimit())
  1201. pr_err("Spider TX RAM full\n");
  1202. show_error = 0;
  1203. break;
  1204. case SPIDER_NET_GRFDFLLINT: /* fallthrough */
  1205. case SPIDER_NET_GRFCFLLINT: /* fallthrough */
  1206. case SPIDER_NET_GRFBFLLINT: /* fallthrough */
  1207. case SPIDER_NET_GRFAFLLINT: /* fallthrough */
  1208. case SPIDER_NET_GRMFLLINT:
  1209. if (netif_msg_intr(card) && net_ratelimit())
  1210. pr_err("Spider RX RAM full, incoming packets "
  1211. "might be discarded!\n");
  1212. spider_net_rx_irq_off(card);
  1213. netif_rx_schedule(card->netdev);
  1214. show_error = 0;
  1215. break;
  1216. /* case SPIDER_NET_GTMSHTINT: problem, print a message */
  1217. case SPIDER_NET_GDTINVDINT:
  1218. /* allrighty. tx from previous descr ok */
  1219. show_error = 0;
  1220. break;
  1221. /* chain end */
  1222. case SPIDER_NET_GDDDCEINT: /* fallthrough */
  1223. case SPIDER_NET_GDCDCEINT: /* fallthrough */
  1224. case SPIDER_NET_GDBDCEINT: /* fallthrough */
  1225. case SPIDER_NET_GDADCEINT:
  1226. if (netif_msg_intr(card) && net_ratelimit())
  1227. pr_err("got descriptor chain end interrupt, "
  1228. "restarting DMAC %c.\n",
  1229. 'D'-(i-SPIDER_NET_GDDDCEINT)/3);
  1230. spider_net_refill_rx_chain(card);
  1231. spider_net_enable_rxdmac(card);
  1232. show_error = 0;
  1233. break;
  1234. /* invalid descriptor */
  1235. case SPIDER_NET_GDDINVDINT: /* fallthrough */
  1236. case SPIDER_NET_GDCINVDINT: /* fallthrough */
  1237. case SPIDER_NET_GDBINVDINT: /* fallthrough */
  1238. case SPIDER_NET_GDAINVDINT:
  1239. /* could happen when rx chain is full */
  1240. spider_net_refill_rx_chain(card);
  1241. spider_net_enable_rxdmac(card);
  1242. show_error = 0;
  1243. break;
  1244. /* case SPIDER_NET_GDTRSERINT: problem, print a message */
  1245. /* case SPIDER_NET_GDDRSERINT: problem, print a message */
  1246. /* case SPIDER_NET_GDCRSERINT: problem, print a message */
  1247. /* case SPIDER_NET_GDBRSERINT: problem, print a message */
  1248. /* case SPIDER_NET_GDARSERINT: problem, print a message */
  1249. /* case SPIDER_NET_GDSERINT: problem, print a message */
  1250. /* case SPIDER_NET_GDTPTERINT: problem, print a message */
  1251. /* case SPIDER_NET_GDDPTERINT: problem, print a message */
  1252. /* case SPIDER_NET_GDCPTERINT: problem, print a message */
  1253. /* case SPIDER_NET_GDBPTERINT: problem, print a message */
  1254. /* case SPIDER_NET_GDAPTERINT: problem, print a message */
  1255. default:
  1256. show_error = 1;
  1257. break;
  1258. }
  1259. /* check GHIINT2STS ************************************/
  1260. if (error_reg2)
  1261. for (i = 0; i < 32; i++)
  1262. if (error_reg2 & (1<<i))
  1263. switch (i)
  1264. {
  1265. /* there is nothing we can (want to) do at this time. Log a
  1266. * message, we can switch on and off the specific values later on
  1267. case SPIDER_NET_GPROPERINT:
  1268. case SPIDER_NET_GMCTCRSNGINT:
  1269. case SPIDER_NET_GMCTLCOLINT:
  1270. case SPIDER_NET_GMCTTMOTINT:
  1271. case SPIDER_NET_GMCRCAERINT:
  1272. case SPIDER_NET_GMCRCALERINT:
  1273. case SPIDER_NET_GMCRALNERINT:
  1274. case SPIDER_NET_GMCROVRINT:
  1275. case SPIDER_NET_GMCRRNTINT:
  1276. case SPIDER_NET_GMCRRXERINT:
  1277. case SPIDER_NET_GTITCSERINT:
  1278. case SPIDER_NET_GTIFMTERINT:
  1279. case SPIDER_NET_GTIPKTRVKINT:
  1280. case SPIDER_NET_GTISPINGINT:
  1281. case SPIDER_NET_GTISADNGINT:
  1282. case SPIDER_NET_GTISPDNGINT:
  1283. case SPIDER_NET_GRIFMTERINT:
  1284. case SPIDER_NET_GRIPKTRVKINT:
  1285. case SPIDER_NET_GRISPINGINT:
  1286. case SPIDER_NET_GRISADNGINT:
  1287. case SPIDER_NET_GRISPDNGINT:
  1288. break;
  1289. */
  1290. default:
  1291. break;
  1292. }
  1293. if ((show_error) && (netif_msg_intr(card)) && net_ratelimit())
  1294. pr_err("Got error interrupt on %s, GHIINT0STS = 0x%08x, "
  1295. "GHIINT1STS = 0x%08x, GHIINT2STS = 0x%08x\n",
  1296. card->netdev->name,
  1297. status_reg, error_reg1, error_reg2);
  1298. /* clear interrupt sources */
  1299. spider_net_write_reg(card, SPIDER_NET_GHIINT1STS, error_reg1);
  1300. spider_net_write_reg(card, SPIDER_NET_GHIINT2STS, error_reg2);
  1301. }
  1302. /**
  1303. * spider_net_interrupt - interrupt handler for spider_net
  1304. * @irq: interupt number
  1305. * @ptr: pointer to net_device
  1306. * @regs: PU registers
  1307. *
  1308. * returns IRQ_HANDLED, if interrupt was for driver, or IRQ_NONE, if no
  1309. * interrupt found raised by card.
  1310. *
  1311. * This is the interrupt handler, that turns off
  1312. * interrupts for this device and makes the stack poll the driver
  1313. */
  1314. static irqreturn_t
  1315. spider_net_interrupt(int irq, void *ptr)
  1316. {
  1317. struct net_device *netdev = ptr;
  1318. struct spider_net_card *card = netdev_priv(netdev);
  1319. u32 status_reg;
  1320. status_reg = spider_net_read_reg(card, SPIDER_NET_GHIINT0STS);
  1321. if (!status_reg)
  1322. return IRQ_NONE;
  1323. if (status_reg & SPIDER_NET_RXINT ) {
  1324. spider_net_rx_irq_off(card);
  1325. netif_rx_schedule(netdev);
  1326. }
  1327. if (status_reg & SPIDER_NET_TXINT)
  1328. netif_rx_schedule(netdev);
  1329. if (status_reg & SPIDER_NET_ERRINT )
  1330. spider_net_handle_error_irq(card, status_reg);
  1331. /* clear interrupt sources */
  1332. spider_net_write_reg(card, SPIDER_NET_GHIINT0STS, status_reg);
  1333. return IRQ_HANDLED;
  1334. }
  1335. #ifdef CONFIG_NET_POLL_CONTROLLER
  1336. /**
  1337. * spider_net_poll_controller - artificial interrupt for netconsole etc.
  1338. * @netdev: interface device structure
  1339. *
  1340. * see Documentation/networking/netconsole.txt
  1341. */
  1342. static void
  1343. spider_net_poll_controller(struct net_device *netdev)
  1344. {
  1345. disable_irq(netdev->irq);
  1346. spider_net_interrupt(netdev->irq, netdev);
  1347. enable_irq(netdev->irq);
  1348. }
  1349. #endif /* CONFIG_NET_POLL_CONTROLLER */
  1350. /**
  1351. * spider_net_init_card - initializes the card
  1352. * @card: card structure
  1353. *
  1354. * spider_net_init_card initializes the card so that other registers can
  1355. * be used
  1356. */
  1357. static void
  1358. spider_net_init_card(struct spider_net_card *card)
  1359. {
  1360. spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
  1361. SPIDER_NET_CKRCTRL_STOP_VALUE);
  1362. spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
  1363. SPIDER_NET_CKRCTRL_RUN_VALUE);
  1364. }
  1365. /**
  1366. * spider_net_enable_card - enables the card by setting all kinds of regs
  1367. * @card: card structure
  1368. *
  1369. * spider_net_enable_card sets a lot of SMMIO registers to enable the device
  1370. */
  1371. static void
  1372. spider_net_enable_card(struct spider_net_card *card)
  1373. {
  1374. int i;
  1375. /* the following array consists of (register),(value) pairs
  1376. * that are set in this function. A register of 0 ends the list */
  1377. u32 regs[][2] = {
  1378. { SPIDER_NET_GRESUMINTNUM, 0 },
  1379. { SPIDER_NET_GREINTNUM, 0 },
  1380. /* set interrupt frame number registers */
  1381. /* clear the single DMA engine registers first */
  1382. { SPIDER_NET_GFAFRMNUM, SPIDER_NET_GFXFRAMES_VALUE },
  1383. { SPIDER_NET_GFBFRMNUM, SPIDER_NET_GFXFRAMES_VALUE },
  1384. { SPIDER_NET_GFCFRMNUM, SPIDER_NET_GFXFRAMES_VALUE },
  1385. { SPIDER_NET_GFDFRMNUM, SPIDER_NET_GFXFRAMES_VALUE },
  1386. /* then set, what we really need */
  1387. { SPIDER_NET_GFFRMNUM, SPIDER_NET_FRAMENUM_VALUE },
  1388. /* timer counter registers and stuff */
  1389. { SPIDER_NET_GFREECNNUM, 0 },
  1390. { SPIDER_NET_GONETIMENUM, 0 },
  1391. { SPIDER_NET_GTOUTFRMNUM, 0 },
  1392. /* RX mode setting */
  1393. { SPIDER_NET_GRXMDSET, SPIDER_NET_RXMODE_VALUE },
  1394. /* TX mode setting */
  1395. { SPIDER_NET_GTXMDSET, SPIDER_NET_TXMODE_VALUE },
  1396. /* IPSEC mode setting */
  1397. { SPIDER_NET_GIPSECINIT, SPIDER_NET_IPSECINIT_VALUE },
  1398. { SPIDER_NET_GFTRESTRT, SPIDER_NET_RESTART_VALUE },
  1399. { SPIDER_NET_GMRWOLCTRL, 0 },
  1400. { SPIDER_NET_GTESTMD, 0x10000000 },
  1401. { SPIDER_NET_GTTQMSK, 0x00400040 },
  1402. { SPIDER_NET_GMACINTEN, 0 },
  1403. /* flow control stuff */
  1404. { SPIDER_NET_GMACAPAUSE, SPIDER_NET_MACAPAUSE_VALUE },
  1405. { SPIDER_NET_GMACTXPAUSE, SPIDER_NET_TXPAUSE_VALUE },
  1406. { SPIDER_NET_GMACBSTLMT, SPIDER_NET_BURSTLMT_VALUE },
  1407. { 0, 0}
  1408. };
  1409. i = 0;
  1410. while (regs[i][0]) {
  1411. spider_net_write_reg(card, regs[i][0], regs[i][1]);
  1412. i++;
  1413. }
  1414. /* clear unicast filter table entries 1 to 14 */
  1415. for (i = 1; i <= 14; i++) {
  1416. spider_net_write_reg(card,
  1417. SPIDER_NET_GMRUAFILnR + i * 8,
  1418. 0x00080000);
  1419. spider_net_write_reg(card,
  1420. SPIDER_NET_GMRUAFILnR + i * 8 + 4,
  1421. 0x00000000);
  1422. }
  1423. spider_net_write_reg(card, SPIDER_NET_GMRUA0FIL15R, 0x08080000);
  1424. spider_net_write_reg(card, SPIDER_NET_ECMODE, SPIDER_NET_ECMODE_VALUE);
  1425. /* set chain tail adress for RX chains and
  1426. * enable DMA */
  1427. spider_net_enable_rxchtails(card);
  1428. spider_net_enable_rxdmac(card);
  1429. spider_net_write_reg(card, SPIDER_NET_GRXDMAEN, SPIDER_NET_WOL_VALUE);
  1430. spider_net_write_reg(card, SPIDER_NET_GMACLENLMT,
  1431. SPIDER_NET_LENLMT_VALUE);
  1432. spider_net_write_reg(card, SPIDER_NET_GMACMODE,
  1433. SPIDER_NET_MACMODE_VALUE);
  1434. spider_net_write_reg(card, SPIDER_NET_GMACOPEMD,
  1435. SPIDER_NET_OPMODE_VALUE);
  1436. /* set interrupt mask registers */
  1437. spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK,
  1438. SPIDER_NET_INT0_MASK_VALUE);
  1439. spider_net_write_reg(card, SPIDER_NET_GHIINT1MSK,
  1440. SPIDER_NET_INT1_MASK_VALUE);
  1441. spider_net_write_reg(card, SPIDER_NET_GHIINT2MSK,
  1442. SPIDER_NET_INT2_MASK_VALUE);
  1443. spider_net_write_reg(card, SPIDER_NET_GDTDMACCNTR,
  1444. SPIDER_NET_GDTBSTA);
  1445. }
  1446. /**
  1447. * spider_net_open - called upon ifonfig up
  1448. * @netdev: interface device structure
  1449. *
  1450. * returns 0 on success, <0 on failure
  1451. *
  1452. * spider_net_open allocates all the descriptors and memory needed for
  1453. * operation, sets up multicast list and enables interrupts
  1454. */
  1455. int
  1456. spider_net_open(struct net_device *netdev)
  1457. {
  1458. struct spider_net_card *card = netdev_priv(netdev);
  1459. int result;
  1460. result = spider_net_init_chain(card, &card->tx_chain);
  1461. if (result)
  1462. goto alloc_tx_failed;
  1463. card->low_watermark = NULL;
  1464. result = spider_net_init_chain(card, &card->rx_chain);
  1465. if (result)
  1466. goto alloc_rx_failed;
  1467. /* Allocate rx skbs */
  1468. if (spider_net_alloc_rx_skbs(card))
  1469. goto alloc_skbs_failed;
  1470. spider_net_set_multi(netdev);
  1471. /* further enhancement: setup hw vlan, if needed */
  1472. result = -EBUSY;
  1473. if (request_irq(netdev->irq, spider_net_interrupt,
  1474. IRQF_SHARED, netdev->name, netdev))
  1475. goto register_int_failed;
  1476. spider_net_enable_card(card);
  1477. netif_start_queue(netdev);
  1478. netif_carrier_on(netdev);
  1479. netif_poll_enable(netdev);
  1480. return 0;
  1481. register_int_failed:
  1482. spider_net_free_rx_chain_contents(card);
  1483. alloc_skbs_failed:
  1484. spider_net_free_chain(card, &card->rx_chain);
  1485. alloc_rx_failed:
  1486. spider_net_free_chain(card, &card->tx_chain);
  1487. alloc_tx_failed:
  1488. return result;
  1489. }
  1490. /**
  1491. * spider_net_setup_phy - setup PHY
  1492. * @card: card structure
  1493. *
  1494. * returns 0 on success, <0 on failure
  1495. *
  1496. * spider_net_setup_phy is used as part of spider_net_probe. Sets
  1497. * the PHY to 1000 Mbps
  1498. **/
  1499. static int
  1500. spider_net_setup_phy(struct spider_net_card *card)
  1501. {
  1502. struct mii_phy *phy = &card->phy;
  1503. spider_net_write_reg(card, SPIDER_NET_GDTDMASEL,
  1504. SPIDER_NET_DMASEL_VALUE);
  1505. spider_net_write_reg(card, SPIDER_NET_GPCCTRL,
  1506. SPIDER_NET_PHY_CTRL_VALUE);
  1507. phy->mii_id = 1;
  1508. phy->dev = card->netdev;
  1509. phy->mdio_read = spider_net_read_phy;
  1510. phy->mdio_write = spider_net_write_phy;
  1511. mii_phy_probe(phy, phy->mii_id);
  1512. if (phy->def->ops->setup_forced)
  1513. phy->def->ops->setup_forced(phy, SPEED_1000, DUPLEX_FULL);
  1514. phy->def->ops->enable_fiber(phy);
  1515. phy->def->ops->read_link(phy);
  1516. pr_info("Found %s with %i Mbps, %s-duplex.\n", phy->def->name,
  1517. phy->speed, phy->duplex==1 ? "Full" : "Half");
  1518. return 0;
  1519. }
  1520. /**
  1521. * spider_net_download_firmware - loads firmware into the adapter
  1522. * @card: card structure
  1523. * @firmware_ptr: pointer to firmware data
  1524. *
  1525. * spider_net_download_firmware loads the firmware data into the
  1526. * adapter. It assumes the length etc. to be allright.
  1527. */
  1528. static int
  1529. spider_net_download_firmware(struct spider_net_card *card,
  1530. const void *firmware_ptr)
  1531. {
  1532. int sequencer, i;
  1533. const u32 *fw_ptr = firmware_ptr;
  1534. /* stop sequencers */
  1535. spider_net_write_reg(card, SPIDER_NET_GSINIT,
  1536. SPIDER_NET_STOP_SEQ_VALUE);
  1537. for (sequencer = 0; sequencer < SPIDER_NET_FIRMWARE_SEQS;
  1538. sequencer++) {
  1539. spider_net_write_reg(card,
  1540. SPIDER_NET_GSnPRGADR + sequencer * 8, 0);
  1541. for (i = 0; i < SPIDER_NET_FIRMWARE_SEQWORDS; i++) {
  1542. spider_net_write_reg(card, SPIDER_NET_GSnPRGDAT +
  1543. sequencer * 8, *fw_ptr);
  1544. fw_ptr++;
  1545. }
  1546. }
  1547. if (spider_net_read_reg(card, SPIDER_NET_GSINIT))
  1548. return -EIO;
  1549. spider_net_write_reg(card, SPIDER_NET_GSINIT,
  1550. SPIDER_NET_RUN_SEQ_VALUE);
  1551. return 0;
  1552. }
  1553. /**
  1554. * spider_net_init_firmware - reads in firmware parts
  1555. * @card: card structure
  1556. *
  1557. * Returns 0 on success, <0 on failure
  1558. *
  1559. * spider_net_init_firmware opens the sequencer firmware and does some basic
  1560. * checks. This function opens and releases the firmware structure. A call
  1561. * to download the firmware is performed before the release.
  1562. *
  1563. * Firmware format
  1564. * ===============
  1565. * spider_fw.bin is expected to be a file containing 6*1024*4 bytes, 4k being
  1566. * the program for each sequencer. Use the command
  1567. * tail -q -n +2 Seq_code1_0x088.txt Seq_code2_0x090.txt \
  1568. * Seq_code3_0x098.txt Seq_code4_0x0A0.txt Seq_code5_0x0A8.txt \
  1569. * Seq_code6_0x0B0.txt | xxd -r -p -c4 > spider_fw.bin
  1570. *
  1571. * to generate spider_fw.bin, if you have sequencer programs with something
  1572. * like the following contents for each sequencer:
  1573. * <ONE LINE COMMENT>
  1574. * <FIRST 4-BYTES-WORD FOR SEQUENCER>
  1575. * <SECOND 4-BYTES-WORD FOR SEQUENCER>
  1576. * ...
  1577. * <1024th 4-BYTES-WORD FOR SEQUENCER>
  1578. */
  1579. static int
  1580. spider_net_init_firmware(struct spider_net_card *card)
  1581. {
  1582. struct firmware *firmware = NULL;
  1583. struct device_node *dn;
  1584. const u8 *fw_prop = NULL;
  1585. int err = -ENOENT;
  1586. int fw_size;
  1587. if (request_firmware((const struct firmware **)&firmware,
  1588. SPIDER_NET_FIRMWARE_NAME, &card->pdev->dev) == 0) {
  1589. if ( (firmware->size != SPIDER_NET_FIRMWARE_LEN) &&
  1590. netif_msg_probe(card) ) {
  1591. pr_err("Incorrect size of spidernet firmware in " \
  1592. "filesystem. Looking in host firmware...\n");
  1593. goto try_host_fw;
  1594. }
  1595. err = spider_net_download_firmware(card, firmware->data);
  1596. release_firmware(firmware);
  1597. if (err)
  1598. goto try_host_fw;
  1599. goto done;
  1600. }
  1601. try_host_fw:
  1602. dn = pci_device_to_OF_node(card->pdev);
  1603. if (!dn)
  1604. goto out_err;
  1605. fw_prop = get_property(dn, "firmware", &fw_size);
  1606. if (!fw_prop)
  1607. goto out_err;
  1608. if ( (fw_size != SPIDER_NET_FIRMWARE_LEN) &&
  1609. netif_msg_probe(card) ) {
  1610. pr_err("Incorrect size of spidernet firmware in " \
  1611. "host firmware\n");
  1612. goto done;
  1613. }
  1614. err = spider_net_download_firmware(card, fw_prop);
  1615. done:
  1616. return err;
  1617. out_err:
  1618. if (netif_msg_probe(card))
  1619. pr_err("Couldn't find spidernet firmware in filesystem " \
  1620. "or host firmware\n");
  1621. return err;
  1622. }
  1623. /**
  1624. * spider_net_workaround_rxramfull - work around firmware bug
  1625. * @card: card structure
  1626. *
  1627. * no return value
  1628. **/
  1629. static void
  1630. spider_net_workaround_rxramfull(struct spider_net_card *card)
  1631. {
  1632. int i, sequencer = 0;
  1633. /* cancel reset */
  1634. spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
  1635. SPIDER_NET_CKRCTRL_RUN_VALUE);
  1636. /* empty sequencer data */
  1637. for (sequencer = 0; sequencer < SPIDER_NET_FIRMWARE_SEQS;
  1638. sequencer++) {
  1639. spider_net_write_reg(card, SPIDER_NET_GSnPRGADR +
  1640. sequencer * 8, 0x0);
  1641. for (i = 0; i < SPIDER_NET_FIRMWARE_SEQWORDS; i++) {
  1642. spider_net_write_reg(card, SPIDER_NET_GSnPRGDAT +
  1643. sequencer * 8, 0x0);
  1644. }
  1645. }
  1646. /* set sequencer operation */
  1647. spider_net_write_reg(card, SPIDER_NET_GSINIT, 0x000000fe);
  1648. /* reset */
  1649. spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
  1650. SPIDER_NET_CKRCTRL_STOP_VALUE);
  1651. }
  1652. /**
  1653. * spider_net_stop - called upon ifconfig down
  1654. * @netdev: interface device structure
  1655. *
  1656. * always returns 0
  1657. */
  1658. int
  1659. spider_net_stop(struct net_device *netdev)
  1660. {
  1661. struct spider_net_card *card = netdev_priv(netdev);
  1662. netif_poll_disable(netdev);
  1663. netif_carrier_off(netdev);
  1664. netif_stop_queue(netdev);
  1665. del_timer_sync(&card->tx_timer);
  1666. /* disable/mask all interrupts */
  1667. spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK, 0);
  1668. spider_net_write_reg(card, SPIDER_NET_GHIINT1MSK, 0);
  1669. spider_net_write_reg(card, SPIDER_NET_GHIINT2MSK, 0);
  1670. /* free_irq(netdev->irq, netdev);*/
  1671. free_irq(to_pci_dev(netdev->class_dev.dev)->irq, netdev);
  1672. spider_net_write_reg(card, SPIDER_NET_GDTDMACCNTR,
  1673. SPIDER_NET_DMA_TX_FEND_VALUE);
  1674. /* turn off DMA, force end */
  1675. spider_net_disable_rxdmac(card);
  1676. /* release chains */
  1677. spider_net_release_tx_chain(card, 1);
  1678. spider_net_free_rx_chain_contents(card);
  1679. spider_net_free_rx_chain_contents(card);
  1680. spider_net_free_chain(card, &card->tx_chain);
  1681. spider_net_free_chain(card, &card->rx_chain);
  1682. return 0;
  1683. }
  1684. /**
  1685. * spider_net_tx_timeout_task - task scheduled by the watchdog timeout
  1686. * function (to be called not under interrupt status)
  1687. * @data: data, is interface device structure
  1688. *
  1689. * called as task when tx hangs, resets interface (if interface is up)
  1690. */
  1691. static void
  1692. spider_net_tx_timeout_task(struct work_struct *work)
  1693. {
  1694. struct spider_net_card *card =
  1695. container_of(work, struct spider_net_card, tx_timeout_task);
  1696. struct net_device *netdev = card->netdev;
  1697. if (!(netdev->flags & IFF_UP))
  1698. goto out;
  1699. netif_device_detach(netdev);
  1700. spider_net_stop(netdev);
  1701. spider_net_workaround_rxramfull(card);
  1702. spider_net_init_card(card);
  1703. if (spider_net_setup_phy(card))
  1704. goto out;
  1705. if (spider_net_init_firmware(card))
  1706. goto out;
  1707. spider_net_open(netdev);
  1708. spider_net_kick_tx_dma(card);
  1709. netif_device_attach(netdev);
  1710. out:
  1711. atomic_dec(&card->tx_timeout_task_counter);
  1712. }
  1713. /**
  1714. * spider_net_tx_timeout - called when the tx timeout watchdog kicks in.
  1715. * @netdev: interface device structure
  1716. *
  1717. * called, if tx hangs. Schedules a task that resets the interface
  1718. */
  1719. static void
  1720. spider_net_tx_timeout(struct net_device *netdev)
  1721. {
  1722. struct spider_net_card *card;
  1723. card = netdev_priv(netdev);
  1724. atomic_inc(&card->tx_timeout_task_counter);
  1725. if (netdev->flags & IFF_UP)
  1726. schedule_work(&card->tx_timeout_task);
  1727. else
  1728. atomic_dec(&card->tx_timeout_task_counter);
  1729. card->spider_stats.tx_timeouts++;
  1730. }
  1731. /**
  1732. * spider_net_setup_netdev_ops - initialization of net_device operations
  1733. * @netdev: net_device structure
  1734. *
  1735. * fills out function pointers in the net_device structure
  1736. */
  1737. static void
  1738. spider_net_setup_netdev_ops(struct net_device *netdev)
  1739. {
  1740. netdev->open = &spider_net_open;
  1741. netdev->stop = &spider_net_stop;
  1742. netdev->hard_start_xmit = &spider_net_xmit;
  1743. netdev->get_stats = &spider_net_get_stats;
  1744. netdev->set_multicast_list = &spider_net_set_multi;
  1745. netdev->set_mac_address = &spider_net_set_mac;
  1746. netdev->change_mtu = &spider_net_change_mtu;
  1747. netdev->do_ioctl = &spider_net_do_ioctl;
  1748. /* tx watchdog */
  1749. netdev->tx_timeout = &spider_net_tx_timeout;
  1750. netdev->watchdog_timeo = SPIDER_NET_WATCHDOG_TIMEOUT;
  1751. /* NAPI */
  1752. netdev->poll = &spider_net_poll;
  1753. netdev->weight = SPIDER_NET_NAPI_WEIGHT;
  1754. /* HW VLAN */
  1755. netdev->vlan_rx_register = &spider_net_vlan_rx_reg;
  1756. netdev->vlan_rx_add_vid = &spider_net_vlan_rx_add;
  1757. netdev->vlan_rx_kill_vid = &spider_net_vlan_rx_kill;
  1758. #ifdef CONFIG_NET_POLL_CONTROLLER
  1759. /* poll controller */
  1760. netdev->poll_controller = &spider_net_poll_controller;
  1761. #endif /* CONFIG_NET_POLL_CONTROLLER */
  1762. /* ethtool ops */
  1763. netdev->ethtool_ops = &spider_net_ethtool_ops;
  1764. }
  1765. /**
  1766. * spider_net_setup_netdev - initialization of net_device
  1767. * @card: card structure
  1768. *
  1769. * Returns 0 on success or <0 on failure
  1770. *
  1771. * spider_net_setup_netdev initializes the net_device structure
  1772. **/
  1773. static int
  1774. spider_net_setup_netdev(struct spider_net_card *card)
  1775. {
  1776. int result;
  1777. struct net_device *netdev = card->netdev;
  1778. struct device_node *dn;
  1779. struct sockaddr addr;
  1780. const u8 *mac;
  1781. SET_MODULE_OWNER(netdev);
  1782. SET_NETDEV_DEV(netdev, &card->pdev->dev);
  1783. pci_set_drvdata(card->pdev, netdev);
  1784. init_timer(&card->tx_timer);
  1785. card->tx_timer.function =
  1786. (void (*)(unsigned long)) spider_net_cleanup_tx_ring;
  1787. card->tx_timer.data = (unsigned long) card;
  1788. netdev->irq = card->pdev->irq;
  1789. card->options.rx_csum = SPIDER_NET_RX_CSUM_DEFAULT;
  1790. card->tx_chain.num_desc = tx_descriptors;
  1791. card->rx_chain.num_desc = rx_descriptors;
  1792. spider_net_setup_netdev_ops(netdev);
  1793. netdev->features = NETIF_F_HW_CSUM | NETIF_F_LLTX;
  1794. /* some time: NETIF_F_HW_VLAN_TX | NETIF_F_HW_VLAN_RX |
  1795. * NETIF_F_HW_VLAN_FILTER */
  1796. netdev->irq = card->pdev->irq;
  1797. dn = pci_device_to_OF_node(card->pdev);
  1798. if (!dn)
  1799. return -EIO;
  1800. mac = get_property(dn, "local-mac-address", NULL);
  1801. if (!mac)
  1802. return -EIO;
  1803. memcpy(addr.sa_data, mac, ETH_ALEN);
  1804. result = spider_net_set_mac(netdev, &addr);
  1805. if ((result) && (netif_msg_probe(card)))
  1806. pr_err("Failed to set MAC address: %i\n", result);
  1807. result = register_netdev(netdev);
  1808. if (result) {
  1809. if (netif_msg_probe(card))
  1810. pr_err("Couldn't register net_device: %i\n",
  1811. result);
  1812. return result;
  1813. }
  1814. if (netif_msg_probe(card))
  1815. pr_info("Initialized device %s.\n", netdev->name);
  1816. return 0;
  1817. }
  1818. /**
  1819. * spider_net_alloc_card - allocates net_device and card structure
  1820. *
  1821. * returns the card structure or NULL in case of errors
  1822. *
  1823. * the card and net_device structures are linked to each other
  1824. */
  1825. static struct spider_net_card *
  1826. spider_net_alloc_card(void)
  1827. {
  1828. struct net_device *netdev;
  1829. struct spider_net_card *card;
  1830. netdev = alloc_etherdev(sizeof(struct spider_net_card));
  1831. if (!netdev)
  1832. return NULL;
  1833. card = netdev_priv(netdev);
  1834. card->netdev = netdev;
  1835. card->msg_enable = SPIDER_NET_DEFAULT_MSG;
  1836. INIT_WORK(&card->tx_timeout_task, spider_net_tx_timeout_task);
  1837. init_waitqueue_head(&card->waitq);
  1838. atomic_set(&card->tx_timeout_task_counter, 0);
  1839. return card;
  1840. }
  1841. /**
  1842. * spider_net_undo_pci_setup - releases PCI ressources
  1843. * @card: card structure
  1844. *
  1845. * spider_net_undo_pci_setup releases the mapped regions
  1846. */
  1847. static void
  1848. spider_net_undo_pci_setup(struct spider_net_card *card)
  1849. {
  1850. iounmap(card->regs);
  1851. pci_release_regions(card->pdev);
  1852. }
  1853. /**
  1854. * spider_net_setup_pci_dev - sets up the device in terms of PCI operations
  1855. * @card: card structure
  1856. * @pdev: PCI device
  1857. *
  1858. * Returns the card structure or NULL if any errors occur
  1859. *
  1860. * spider_net_setup_pci_dev initializes pdev and together with the
  1861. * functions called in spider_net_open configures the device so that
  1862. * data can be transferred over it
  1863. * The net_device structure is attached to the card structure, if the
  1864. * function returns without error.
  1865. **/
  1866. static struct spider_net_card *
  1867. spider_net_setup_pci_dev(struct pci_dev *pdev)
  1868. {
  1869. struct spider_net_card *card;
  1870. unsigned long mmio_start, mmio_len;
  1871. if (pci_enable_device(pdev)) {
  1872. pr_err("Couldn't enable PCI device\n");
  1873. return NULL;
  1874. }
  1875. if (!(pci_resource_flags(pdev, 0) & IORESOURCE_MEM)) {
  1876. pr_err("Couldn't find proper PCI device base address.\n");
  1877. goto out_disable_dev;
  1878. }
  1879. if (pci_request_regions(pdev, spider_net_driver_name)) {
  1880. pr_err("Couldn't obtain PCI resources, aborting.\n");
  1881. goto out_disable_dev;
  1882. }
  1883. pci_set_master(pdev);
  1884. card = spider_net_alloc_card();
  1885. if (!card) {
  1886. pr_err("Couldn't allocate net_device structure, "
  1887. "aborting.\n");
  1888. goto out_release_regions;
  1889. }
  1890. card->pdev = pdev;
  1891. /* fetch base address and length of first resource */
  1892. mmio_start = pci_resource_start(pdev, 0);
  1893. mmio_len = pci_resource_len(pdev, 0);
  1894. card->netdev->mem_start = mmio_start;
  1895. card->netdev->mem_end = mmio_start + mmio_len;
  1896. card->regs = ioremap(mmio_start, mmio_len);
  1897. if (!card->regs) {
  1898. pr_err("Couldn't obtain PCI resources, aborting.\n");
  1899. goto out_release_regions;
  1900. }
  1901. return card;
  1902. out_release_regions:
  1903. pci_release_regions(pdev);
  1904. out_disable_dev:
  1905. pci_disable_device(pdev);
  1906. pci_set_drvdata(pdev, NULL);
  1907. return NULL;
  1908. }
  1909. /**
  1910. * spider_net_probe - initialization of a device
  1911. * @pdev: PCI device
  1912. * @ent: entry in the device id list
  1913. *
  1914. * Returns 0 on success, <0 on failure
  1915. *
  1916. * spider_net_probe initializes pdev and registers a net_device
  1917. * structure for it. After that, the device can be ifconfig'ed up
  1918. **/
  1919. static int __devinit
  1920. spider_net_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
  1921. {
  1922. int err = -EIO;
  1923. struct spider_net_card *card;
  1924. card = spider_net_setup_pci_dev(pdev);
  1925. if (!card)
  1926. goto out;
  1927. spider_net_workaround_rxramfull(card);
  1928. spider_net_init_card(card);
  1929. err = spider_net_setup_phy(card);
  1930. if (err)
  1931. goto out_undo_pci;
  1932. err = spider_net_init_firmware(card);
  1933. if (err)
  1934. goto out_undo_pci;
  1935. err = spider_net_setup_netdev(card);
  1936. if (err)
  1937. goto out_undo_pci;
  1938. return 0;
  1939. out_undo_pci:
  1940. spider_net_undo_pci_setup(card);
  1941. free_netdev(card->netdev);
  1942. out:
  1943. return err;
  1944. }
  1945. /**
  1946. * spider_net_remove - removal of a device
  1947. * @pdev: PCI device
  1948. *
  1949. * Returns 0 on success, <0 on failure
  1950. *
  1951. * spider_net_remove is called to remove the device and unregisters the
  1952. * net_device
  1953. **/
  1954. static void __devexit
  1955. spider_net_remove(struct pci_dev *pdev)
  1956. {
  1957. struct net_device *netdev;
  1958. struct spider_net_card *card;
  1959. netdev = pci_get_drvdata(pdev);
  1960. card = netdev_priv(netdev);
  1961. wait_event(card->waitq,
  1962. atomic_read(&card->tx_timeout_task_counter) == 0);
  1963. unregister_netdev(netdev);
  1964. /* switch off card */
  1965. spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
  1966. SPIDER_NET_CKRCTRL_STOP_VALUE);
  1967. spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
  1968. SPIDER_NET_CKRCTRL_RUN_VALUE);
  1969. spider_net_undo_pci_setup(card);
  1970. free_netdev(netdev);
  1971. }
  1972. static struct pci_driver spider_net_driver = {
  1973. .name = spider_net_driver_name,
  1974. .id_table = spider_net_pci_tbl,
  1975. .probe = spider_net_probe,
  1976. .remove = __devexit_p(spider_net_remove)
  1977. };
  1978. /**
  1979. * spider_net_init - init function when the driver is loaded
  1980. *
  1981. * spider_net_init registers the device driver
  1982. */
  1983. static int __init spider_net_init(void)
  1984. {
  1985. printk(KERN_INFO "Spidernet version %s.\n", VERSION);
  1986. if (rx_descriptors < SPIDER_NET_RX_DESCRIPTORS_MIN) {
  1987. rx_descriptors = SPIDER_NET_RX_DESCRIPTORS_MIN;
  1988. pr_info("adjusting rx descriptors to %i.\n", rx_descriptors);
  1989. }
  1990. if (rx_descriptors > SPIDER_NET_RX_DESCRIPTORS_MAX) {
  1991. rx_descriptors = SPIDER_NET_RX_DESCRIPTORS_MAX;
  1992. pr_info("adjusting rx descriptors to %i.\n", rx_descriptors);
  1993. }
  1994. if (tx_descriptors < SPIDER_NET_TX_DESCRIPTORS_MIN) {
  1995. tx_descriptors = SPIDER_NET_TX_DESCRIPTORS_MIN;
  1996. pr_info("adjusting tx descriptors to %i.\n", tx_descriptors);
  1997. }
  1998. if (tx_descriptors > SPIDER_NET_TX_DESCRIPTORS_MAX) {
  1999. tx_descriptors = SPIDER_NET_TX_DESCRIPTORS_MAX;
  2000. pr_info("adjusting tx descriptors to %i.\n", tx_descriptors);
  2001. }
  2002. return pci_register_driver(&spider_net_driver);
  2003. }
  2004. /**
  2005. * spider_net_cleanup - exit function when driver is unloaded
  2006. *
  2007. * spider_net_cleanup unregisters the device driver
  2008. */
  2009. static void __exit spider_net_cleanup(void)
  2010. {
  2011. pci_unregister_driver(&spider_net_driver);
  2012. }
  2013. module_init(spider_net_init);
  2014. module_exit(spider_net_cleanup);