cc770.c 23 KB

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  1. // SPDX-License-Identifier: GPL-2.0-only
  2. /*
  3. * Core driver for the CC770 and AN82527 CAN controllers
  4. *
  5. * Copyright (C) 2009, 2011 Wolfgang Grandegger <[email protected]>
  6. */
  7. #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  8. #include <linux/module.h>
  9. #include <linux/init.h>
  10. #include <linux/kernel.h>
  11. #include <linux/sched.h>
  12. #include <linux/types.h>
  13. #include <linux/fcntl.h>
  14. #include <linux/interrupt.h>
  15. #include <linux/ptrace.h>
  16. #include <linux/string.h>
  17. #include <linux/errno.h>
  18. #include <linux/ethtool.h>
  19. #include <linux/netdevice.h>
  20. #include <linux/if_arp.h>
  21. #include <linux/if_ether.h>
  22. #include <linux/skbuff.h>
  23. #include <linux/delay.h>
  24. #include <linux/can.h>
  25. #include <linux/can/dev.h>
  26. #include <linux/can/error.h>
  27. #include <linux/can/platform/cc770.h>
  28. #include "cc770.h"
  29. MODULE_AUTHOR("Wolfgang Grandegger <[email protected]>");
  30. MODULE_LICENSE("GPL v2");
  31. MODULE_DESCRIPTION(KBUILD_MODNAME "CAN netdevice driver");
  32. /*
  33. * The CC770 is a CAN controller from Bosch, which is 100% compatible
  34. * with the AN82527 from Intel, but with "bugs" being fixed and some
  35. * additional functionality, mainly:
  36. *
  37. * 1. RX and TX error counters are readable.
  38. * 2. Support of silent (listen-only) mode.
  39. * 3. Message object 15 can receive all types of frames, also RTR and EFF.
  40. *
  41. * Details are available from Bosch's "CC770_Product_Info_2007-01.pdf",
  42. * which explains in detail the compatibility between the CC770 and the
  43. * 82527. This driver use the additional functionality 3. on real CC770
  44. * devices. Unfortunately, the CC770 does still not store the message
  45. * identifier of received remote transmission request frames and
  46. * therefore it's set to 0.
  47. *
  48. * The message objects 1..14 can be used for TX and RX while the message
  49. * objects 15 is optimized for RX. It has a shadow register for reliable
  50. * data reception under heavy bus load. Therefore it makes sense to use
  51. * this message object for the needed use case. The frame type (EFF/SFF)
  52. * for the message object 15 can be defined via kernel module parameter
  53. * "msgobj15_eff". If not equal 0, it will receive 29-bit EFF frames,
  54. * otherwise 11 bit SFF messages.
  55. */
  56. static int msgobj15_eff;
  57. module_param(msgobj15_eff, int, 0444);
  58. MODULE_PARM_DESC(msgobj15_eff, "Extended 29-bit frames for message object 15 "
  59. "(default: 11-bit standard frames)");
  60. static int i82527_compat;
  61. module_param(i82527_compat, int, 0444);
  62. MODULE_PARM_DESC(i82527_compat, "Strict Intel 82527 compatibility mode "
  63. "without using additional functions");
  64. /*
  65. * This driver uses the last 5 message objects 11..15. The definitions
  66. * and structure below allows to configure and assign them to the real
  67. * message object.
  68. */
  69. static unsigned char cc770_obj_flags[CC770_OBJ_MAX] = {
  70. [CC770_OBJ_RX0] = CC770_OBJ_FLAG_RX,
  71. [CC770_OBJ_RX1] = CC770_OBJ_FLAG_RX | CC770_OBJ_FLAG_EFF,
  72. [CC770_OBJ_RX_RTR0] = CC770_OBJ_FLAG_RX | CC770_OBJ_FLAG_RTR,
  73. [CC770_OBJ_RX_RTR1] = CC770_OBJ_FLAG_RX | CC770_OBJ_FLAG_RTR |
  74. CC770_OBJ_FLAG_EFF,
  75. [CC770_OBJ_TX] = 0,
  76. };
  77. static const struct can_bittiming_const cc770_bittiming_const = {
  78. .name = KBUILD_MODNAME,
  79. .tseg1_min = 1,
  80. .tseg1_max = 16,
  81. .tseg2_min = 1,
  82. .tseg2_max = 8,
  83. .sjw_max = 4,
  84. .brp_min = 1,
  85. .brp_max = 64,
  86. .brp_inc = 1,
  87. };
  88. static inline int intid2obj(unsigned int intid)
  89. {
  90. if (intid == 2)
  91. return 0;
  92. else
  93. return MSGOBJ_LAST + 2 - intid;
  94. }
  95. static void enable_all_objs(const struct net_device *dev)
  96. {
  97. struct cc770_priv *priv = netdev_priv(dev);
  98. u8 msgcfg;
  99. unsigned char obj_flags;
  100. unsigned int o, mo;
  101. for (o = 0; o < ARRAY_SIZE(priv->obj_flags); o++) {
  102. obj_flags = priv->obj_flags[o];
  103. mo = obj2msgobj(o);
  104. if (obj_flags & CC770_OBJ_FLAG_RX) {
  105. /*
  106. * We don't need extra objects for RTR and EFF if
  107. * the additional CC770 functions are enabled.
  108. */
  109. if (priv->control_normal_mode & CTRL_EAF) {
  110. if (o > 0)
  111. continue;
  112. netdev_dbg(dev, "Message object %d for "
  113. "RX data, RTR, SFF and EFF\n", mo);
  114. } else {
  115. netdev_dbg(dev,
  116. "Message object %d for RX %s %s\n",
  117. mo, obj_flags & CC770_OBJ_FLAG_RTR ?
  118. "RTR" : "data",
  119. obj_flags & CC770_OBJ_FLAG_EFF ?
  120. "EFF" : "SFF");
  121. }
  122. if (obj_flags & CC770_OBJ_FLAG_EFF)
  123. msgcfg = MSGCFG_XTD;
  124. else
  125. msgcfg = 0;
  126. if (obj_flags & CC770_OBJ_FLAG_RTR)
  127. msgcfg |= MSGCFG_DIR;
  128. cc770_write_reg(priv, msgobj[mo].config, msgcfg);
  129. cc770_write_reg(priv, msgobj[mo].ctrl0,
  130. MSGVAL_SET | TXIE_RES |
  131. RXIE_SET | INTPND_RES);
  132. if (obj_flags & CC770_OBJ_FLAG_RTR)
  133. cc770_write_reg(priv, msgobj[mo].ctrl1,
  134. NEWDAT_RES | CPUUPD_SET |
  135. TXRQST_RES | RMTPND_RES);
  136. else
  137. cc770_write_reg(priv, msgobj[mo].ctrl1,
  138. NEWDAT_RES | MSGLST_RES |
  139. TXRQST_RES | RMTPND_RES);
  140. } else {
  141. netdev_dbg(dev, "Message object %d for "
  142. "TX data, RTR, SFF and EFF\n", mo);
  143. cc770_write_reg(priv, msgobj[mo].ctrl1,
  144. RMTPND_RES | TXRQST_RES |
  145. CPUUPD_RES | NEWDAT_RES);
  146. cc770_write_reg(priv, msgobj[mo].ctrl0,
  147. MSGVAL_RES | TXIE_RES |
  148. RXIE_RES | INTPND_RES);
  149. }
  150. }
  151. }
  152. static void disable_all_objs(const struct cc770_priv *priv)
  153. {
  154. int o, mo;
  155. for (o = 0; o < ARRAY_SIZE(priv->obj_flags); o++) {
  156. mo = obj2msgobj(o);
  157. if (priv->obj_flags[o] & CC770_OBJ_FLAG_RX) {
  158. if (o > 0 && priv->control_normal_mode & CTRL_EAF)
  159. continue;
  160. cc770_write_reg(priv, msgobj[mo].ctrl1,
  161. NEWDAT_RES | MSGLST_RES |
  162. TXRQST_RES | RMTPND_RES);
  163. cc770_write_reg(priv, msgobj[mo].ctrl0,
  164. MSGVAL_RES | TXIE_RES |
  165. RXIE_RES | INTPND_RES);
  166. } else {
  167. /* Clear message object for send */
  168. cc770_write_reg(priv, msgobj[mo].ctrl1,
  169. RMTPND_RES | TXRQST_RES |
  170. CPUUPD_RES | NEWDAT_RES);
  171. cc770_write_reg(priv, msgobj[mo].ctrl0,
  172. MSGVAL_RES | TXIE_RES |
  173. RXIE_RES | INTPND_RES);
  174. }
  175. }
  176. }
  177. static void set_reset_mode(struct net_device *dev)
  178. {
  179. struct cc770_priv *priv = netdev_priv(dev);
  180. /* Enable configuration and puts chip in bus-off, disable interrupts */
  181. cc770_write_reg(priv, control, CTRL_CCE | CTRL_INI);
  182. priv->can.state = CAN_STATE_STOPPED;
  183. /* Clear interrupts */
  184. cc770_read_reg(priv, interrupt);
  185. /* Clear status register */
  186. cc770_write_reg(priv, status, 0);
  187. /* Disable all used message objects */
  188. disable_all_objs(priv);
  189. }
  190. static void set_normal_mode(struct net_device *dev)
  191. {
  192. struct cc770_priv *priv = netdev_priv(dev);
  193. /* Clear interrupts */
  194. cc770_read_reg(priv, interrupt);
  195. /* Clear status register and pre-set last error code */
  196. cc770_write_reg(priv, status, STAT_LEC_MASK);
  197. /* Enable all used message objects*/
  198. enable_all_objs(dev);
  199. /*
  200. * Clear bus-off, interrupts only for errors,
  201. * not for status change
  202. */
  203. cc770_write_reg(priv, control, priv->control_normal_mode);
  204. priv->can.state = CAN_STATE_ERROR_ACTIVE;
  205. }
  206. static void chipset_init(struct cc770_priv *priv)
  207. {
  208. int mo, id, data;
  209. /* Enable configuration and put chip in bus-off, disable interrupts */
  210. cc770_write_reg(priv, control, (CTRL_CCE | CTRL_INI));
  211. /* Set CLKOUT divider and slew rates */
  212. cc770_write_reg(priv, clkout, priv->clkout);
  213. /* Configure CPU interface / CLKOUT enable */
  214. cc770_write_reg(priv, cpu_interface, priv->cpu_interface);
  215. /* Set bus configuration */
  216. cc770_write_reg(priv, bus_config, priv->bus_config);
  217. /* Clear interrupts */
  218. cc770_read_reg(priv, interrupt);
  219. /* Clear status register */
  220. cc770_write_reg(priv, status, 0);
  221. /* Clear and invalidate message objects */
  222. for (mo = MSGOBJ_FIRST; mo <= MSGOBJ_LAST; mo++) {
  223. cc770_write_reg(priv, msgobj[mo].ctrl0,
  224. INTPND_UNC | RXIE_RES |
  225. TXIE_RES | MSGVAL_RES);
  226. cc770_write_reg(priv, msgobj[mo].ctrl0,
  227. INTPND_RES | RXIE_RES |
  228. TXIE_RES | MSGVAL_RES);
  229. cc770_write_reg(priv, msgobj[mo].ctrl1,
  230. NEWDAT_RES | MSGLST_RES |
  231. TXRQST_RES | RMTPND_RES);
  232. for (data = 0; data < 8; data++)
  233. cc770_write_reg(priv, msgobj[mo].data[data], 0);
  234. for (id = 0; id < 4; id++)
  235. cc770_write_reg(priv, msgobj[mo].id[id], 0);
  236. cc770_write_reg(priv, msgobj[mo].config, 0);
  237. }
  238. /* Set all global ID masks to "don't care" */
  239. cc770_write_reg(priv, global_mask_std[0], 0);
  240. cc770_write_reg(priv, global_mask_std[1], 0);
  241. cc770_write_reg(priv, global_mask_ext[0], 0);
  242. cc770_write_reg(priv, global_mask_ext[1], 0);
  243. cc770_write_reg(priv, global_mask_ext[2], 0);
  244. cc770_write_reg(priv, global_mask_ext[3], 0);
  245. }
  246. static int cc770_probe_chip(struct net_device *dev)
  247. {
  248. struct cc770_priv *priv = netdev_priv(dev);
  249. /* Enable configuration, put chip in bus-off, disable ints */
  250. cc770_write_reg(priv, control, CTRL_CCE | CTRL_EAF | CTRL_INI);
  251. /* Configure cpu interface / CLKOUT disable */
  252. cc770_write_reg(priv, cpu_interface, priv->cpu_interface);
  253. /*
  254. * Check if hardware reset is still inactive or maybe there
  255. * is no chip in this address space
  256. */
  257. if (cc770_read_reg(priv, cpu_interface) & CPUIF_RST) {
  258. netdev_info(dev, "probing @0x%p failed (reset)\n",
  259. priv->reg_base);
  260. return -ENODEV;
  261. }
  262. /* Write and read back test pattern (some arbitrary values) */
  263. cc770_write_reg(priv, msgobj[1].data[1], 0x25);
  264. cc770_write_reg(priv, msgobj[2].data[3], 0x52);
  265. cc770_write_reg(priv, msgobj[10].data[6], 0xc3);
  266. if ((cc770_read_reg(priv, msgobj[1].data[1]) != 0x25) ||
  267. (cc770_read_reg(priv, msgobj[2].data[3]) != 0x52) ||
  268. (cc770_read_reg(priv, msgobj[10].data[6]) != 0xc3)) {
  269. netdev_info(dev, "probing @0x%p failed (pattern)\n",
  270. priv->reg_base);
  271. return -ENODEV;
  272. }
  273. /* Check if this chip is a CC770 supporting additional functions */
  274. if (cc770_read_reg(priv, control) & CTRL_EAF)
  275. priv->control_normal_mode |= CTRL_EAF;
  276. return 0;
  277. }
  278. static void cc770_start(struct net_device *dev)
  279. {
  280. struct cc770_priv *priv = netdev_priv(dev);
  281. /* leave reset mode */
  282. if (priv->can.state != CAN_STATE_STOPPED)
  283. set_reset_mode(dev);
  284. /* leave reset mode */
  285. set_normal_mode(dev);
  286. }
  287. static int cc770_set_mode(struct net_device *dev, enum can_mode mode)
  288. {
  289. switch (mode) {
  290. case CAN_MODE_START:
  291. cc770_start(dev);
  292. netif_wake_queue(dev);
  293. break;
  294. default:
  295. return -EOPNOTSUPP;
  296. }
  297. return 0;
  298. }
  299. static int cc770_set_bittiming(struct net_device *dev)
  300. {
  301. struct cc770_priv *priv = netdev_priv(dev);
  302. struct can_bittiming *bt = &priv->can.bittiming;
  303. u8 btr0, btr1;
  304. btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6);
  305. btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) |
  306. (((bt->phase_seg2 - 1) & 0x7) << 4);
  307. if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
  308. btr1 |= 0x80;
  309. netdev_info(dev, "setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1);
  310. cc770_write_reg(priv, bit_timing_0, btr0);
  311. cc770_write_reg(priv, bit_timing_1, btr1);
  312. return 0;
  313. }
  314. static int cc770_get_berr_counter(const struct net_device *dev,
  315. struct can_berr_counter *bec)
  316. {
  317. struct cc770_priv *priv = netdev_priv(dev);
  318. bec->txerr = cc770_read_reg(priv, tx_error_counter);
  319. bec->rxerr = cc770_read_reg(priv, rx_error_counter);
  320. return 0;
  321. }
  322. static void cc770_tx(struct net_device *dev, int mo)
  323. {
  324. struct cc770_priv *priv = netdev_priv(dev);
  325. struct can_frame *cf = (struct can_frame *)priv->tx_skb->data;
  326. u8 dlc, rtr;
  327. u32 id;
  328. int i;
  329. dlc = cf->len;
  330. id = cf->can_id;
  331. rtr = cf->can_id & CAN_RTR_FLAG ? 0 : MSGCFG_DIR;
  332. cc770_write_reg(priv, msgobj[mo].ctrl0,
  333. MSGVAL_RES | TXIE_RES | RXIE_RES | INTPND_RES);
  334. cc770_write_reg(priv, msgobj[mo].ctrl1,
  335. RMTPND_RES | TXRQST_RES | CPUUPD_SET | NEWDAT_RES);
  336. if (id & CAN_EFF_FLAG) {
  337. id &= CAN_EFF_MASK;
  338. cc770_write_reg(priv, msgobj[mo].config,
  339. (dlc << 4) | rtr | MSGCFG_XTD);
  340. cc770_write_reg(priv, msgobj[mo].id[3], id << 3);
  341. cc770_write_reg(priv, msgobj[mo].id[2], id >> 5);
  342. cc770_write_reg(priv, msgobj[mo].id[1], id >> 13);
  343. cc770_write_reg(priv, msgobj[mo].id[0], id >> 21);
  344. } else {
  345. id &= CAN_SFF_MASK;
  346. cc770_write_reg(priv, msgobj[mo].config, (dlc << 4) | rtr);
  347. cc770_write_reg(priv, msgobj[mo].id[0], id >> 3);
  348. cc770_write_reg(priv, msgobj[mo].id[1], id << 5);
  349. }
  350. for (i = 0; i < dlc; i++)
  351. cc770_write_reg(priv, msgobj[mo].data[i], cf->data[i]);
  352. cc770_write_reg(priv, msgobj[mo].ctrl1,
  353. RMTPND_UNC | TXRQST_SET | CPUUPD_RES | NEWDAT_UNC);
  354. cc770_write_reg(priv, msgobj[mo].ctrl0,
  355. MSGVAL_SET | TXIE_SET | RXIE_SET | INTPND_UNC);
  356. }
  357. static netdev_tx_t cc770_start_xmit(struct sk_buff *skb, struct net_device *dev)
  358. {
  359. struct cc770_priv *priv = netdev_priv(dev);
  360. unsigned int mo = obj2msgobj(CC770_OBJ_TX);
  361. if (can_dev_dropped_skb(dev, skb))
  362. return NETDEV_TX_OK;
  363. netif_stop_queue(dev);
  364. if ((cc770_read_reg(priv,
  365. msgobj[mo].ctrl1) & TXRQST_UNC) == TXRQST_SET) {
  366. netdev_err(dev, "TX register is still occupied!\n");
  367. return NETDEV_TX_BUSY;
  368. }
  369. priv->tx_skb = skb;
  370. cc770_tx(dev, mo);
  371. return NETDEV_TX_OK;
  372. }
  373. static void cc770_rx(struct net_device *dev, unsigned int mo, u8 ctrl1)
  374. {
  375. struct cc770_priv *priv = netdev_priv(dev);
  376. struct net_device_stats *stats = &dev->stats;
  377. struct can_frame *cf;
  378. struct sk_buff *skb;
  379. u8 config;
  380. u32 id;
  381. int i;
  382. skb = alloc_can_skb(dev, &cf);
  383. if (!skb)
  384. return;
  385. config = cc770_read_reg(priv, msgobj[mo].config);
  386. if (ctrl1 & RMTPND_SET) {
  387. /*
  388. * Unfortunately, the chip does not store the real message
  389. * identifier of the received remote transmission request
  390. * frame. Therefore we set it to 0.
  391. */
  392. cf->can_id = CAN_RTR_FLAG;
  393. if (config & MSGCFG_XTD)
  394. cf->can_id |= CAN_EFF_FLAG;
  395. cf->len = 0;
  396. } else {
  397. if (config & MSGCFG_XTD) {
  398. id = cc770_read_reg(priv, msgobj[mo].id[3]);
  399. id |= cc770_read_reg(priv, msgobj[mo].id[2]) << 8;
  400. id |= cc770_read_reg(priv, msgobj[mo].id[1]) << 16;
  401. id |= cc770_read_reg(priv, msgobj[mo].id[0]) << 24;
  402. id >>= 3;
  403. id |= CAN_EFF_FLAG;
  404. } else {
  405. id = cc770_read_reg(priv, msgobj[mo].id[1]);
  406. id |= cc770_read_reg(priv, msgobj[mo].id[0]) << 8;
  407. id >>= 5;
  408. }
  409. cf->can_id = id;
  410. cf->len = can_cc_dlc2len((config & 0xf0) >> 4);
  411. for (i = 0; i < cf->len; i++)
  412. cf->data[i] = cc770_read_reg(priv, msgobj[mo].data[i]);
  413. stats->rx_bytes += cf->len;
  414. }
  415. stats->rx_packets++;
  416. netif_rx(skb);
  417. }
  418. static int cc770_err(struct net_device *dev, u8 status)
  419. {
  420. struct cc770_priv *priv = netdev_priv(dev);
  421. struct can_frame *cf;
  422. struct sk_buff *skb;
  423. u8 lec;
  424. netdev_dbg(dev, "status interrupt (%#x)\n", status);
  425. skb = alloc_can_err_skb(dev, &cf);
  426. if (!skb)
  427. return -ENOMEM;
  428. /* Use extended functions of the CC770 */
  429. if (priv->control_normal_mode & CTRL_EAF) {
  430. cf->can_id |= CAN_ERR_CNT;
  431. cf->data[6] = cc770_read_reg(priv, tx_error_counter);
  432. cf->data[7] = cc770_read_reg(priv, rx_error_counter);
  433. }
  434. if (status & STAT_BOFF) {
  435. /* Disable interrupts */
  436. cc770_write_reg(priv, control, CTRL_INI);
  437. cf->can_id |= CAN_ERR_BUSOFF;
  438. priv->can.state = CAN_STATE_BUS_OFF;
  439. priv->can.can_stats.bus_off++;
  440. can_bus_off(dev);
  441. } else if (status & STAT_WARN) {
  442. cf->can_id |= CAN_ERR_CRTL;
  443. /* Only the CC770 does show error passive */
  444. if (cf->data[7] > 127) {
  445. cf->data[1] = CAN_ERR_CRTL_RX_PASSIVE |
  446. CAN_ERR_CRTL_TX_PASSIVE;
  447. priv->can.state = CAN_STATE_ERROR_PASSIVE;
  448. priv->can.can_stats.error_passive++;
  449. } else {
  450. cf->data[1] = CAN_ERR_CRTL_RX_WARNING |
  451. CAN_ERR_CRTL_TX_WARNING;
  452. priv->can.state = CAN_STATE_ERROR_WARNING;
  453. priv->can.can_stats.error_warning++;
  454. }
  455. } else {
  456. /* Back to error active */
  457. cf->can_id |= CAN_ERR_PROT;
  458. cf->data[2] = CAN_ERR_PROT_ACTIVE;
  459. priv->can.state = CAN_STATE_ERROR_ACTIVE;
  460. }
  461. lec = status & STAT_LEC_MASK;
  462. if (lec < 7 && lec > 0) {
  463. if (lec == STAT_LEC_ACK) {
  464. cf->can_id |= CAN_ERR_ACK;
  465. } else {
  466. cf->can_id |= CAN_ERR_PROT;
  467. switch (lec) {
  468. case STAT_LEC_STUFF:
  469. cf->data[2] |= CAN_ERR_PROT_STUFF;
  470. break;
  471. case STAT_LEC_FORM:
  472. cf->data[2] |= CAN_ERR_PROT_FORM;
  473. break;
  474. case STAT_LEC_BIT1:
  475. cf->data[2] |= CAN_ERR_PROT_BIT1;
  476. break;
  477. case STAT_LEC_BIT0:
  478. cf->data[2] |= CAN_ERR_PROT_BIT0;
  479. break;
  480. case STAT_LEC_CRC:
  481. cf->data[3] = CAN_ERR_PROT_LOC_CRC_SEQ;
  482. break;
  483. }
  484. }
  485. }
  486. netif_rx(skb);
  487. return 0;
  488. }
  489. static int cc770_status_interrupt(struct net_device *dev)
  490. {
  491. struct cc770_priv *priv = netdev_priv(dev);
  492. u8 status;
  493. status = cc770_read_reg(priv, status);
  494. /* Reset the status register including RXOK and TXOK */
  495. cc770_write_reg(priv, status, STAT_LEC_MASK);
  496. if (status & (STAT_WARN | STAT_BOFF) ||
  497. (status & STAT_LEC_MASK) != STAT_LEC_MASK) {
  498. cc770_err(dev, status);
  499. return status & STAT_BOFF;
  500. }
  501. return 0;
  502. }
  503. static void cc770_rx_interrupt(struct net_device *dev, unsigned int o)
  504. {
  505. struct cc770_priv *priv = netdev_priv(dev);
  506. struct net_device_stats *stats = &dev->stats;
  507. unsigned int mo = obj2msgobj(o);
  508. u8 ctrl1;
  509. int n = CC770_MAX_MSG;
  510. while (n--) {
  511. ctrl1 = cc770_read_reg(priv, msgobj[mo].ctrl1);
  512. if (!(ctrl1 & NEWDAT_SET)) {
  513. /* Check for RTR if additional functions are enabled */
  514. if (priv->control_normal_mode & CTRL_EAF) {
  515. if (!(cc770_read_reg(priv, msgobj[mo].ctrl0) &
  516. INTPND_SET))
  517. break;
  518. } else {
  519. break;
  520. }
  521. }
  522. if (ctrl1 & MSGLST_SET) {
  523. stats->rx_over_errors++;
  524. stats->rx_errors++;
  525. }
  526. if (mo < MSGOBJ_LAST)
  527. cc770_write_reg(priv, msgobj[mo].ctrl1,
  528. NEWDAT_RES | MSGLST_RES |
  529. TXRQST_UNC | RMTPND_UNC);
  530. cc770_rx(dev, mo, ctrl1);
  531. cc770_write_reg(priv, msgobj[mo].ctrl0,
  532. MSGVAL_SET | TXIE_RES |
  533. RXIE_SET | INTPND_RES);
  534. cc770_write_reg(priv, msgobj[mo].ctrl1,
  535. NEWDAT_RES | MSGLST_RES |
  536. TXRQST_RES | RMTPND_RES);
  537. }
  538. }
  539. static void cc770_rtr_interrupt(struct net_device *dev, unsigned int o)
  540. {
  541. struct cc770_priv *priv = netdev_priv(dev);
  542. unsigned int mo = obj2msgobj(o);
  543. u8 ctrl0, ctrl1;
  544. int n = CC770_MAX_MSG;
  545. while (n--) {
  546. ctrl0 = cc770_read_reg(priv, msgobj[mo].ctrl0);
  547. if (!(ctrl0 & INTPND_SET))
  548. break;
  549. ctrl1 = cc770_read_reg(priv, msgobj[mo].ctrl1);
  550. cc770_rx(dev, mo, ctrl1);
  551. cc770_write_reg(priv, msgobj[mo].ctrl0,
  552. MSGVAL_SET | TXIE_RES |
  553. RXIE_SET | INTPND_RES);
  554. cc770_write_reg(priv, msgobj[mo].ctrl1,
  555. NEWDAT_RES | CPUUPD_SET |
  556. TXRQST_RES | RMTPND_RES);
  557. }
  558. }
  559. static void cc770_tx_interrupt(struct net_device *dev, unsigned int o)
  560. {
  561. struct cc770_priv *priv = netdev_priv(dev);
  562. struct net_device_stats *stats = &dev->stats;
  563. unsigned int mo = obj2msgobj(o);
  564. u8 ctrl1;
  565. ctrl1 = cc770_read_reg(priv, msgobj[mo].ctrl1);
  566. cc770_write_reg(priv, msgobj[mo].ctrl0,
  567. MSGVAL_RES | TXIE_RES | RXIE_RES | INTPND_RES);
  568. cc770_write_reg(priv, msgobj[mo].ctrl1,
  569. RMTPND_RES | TXRQST_RES | MSGLST_RES | NEWDAT_RES);
  570. if (unlikely(!priv->tx_skb)) {
  571. netdev_err(dev, "missing tx skb in tx interrupt\n");
  572. return;
  573. }
  574. if (unlikely(ctrl1 & MSGLST_SET)) {
  575. stats->rx_over_errors++;
  576. stats->rx_errors++;
  577. }
  578. /* When the CC770 is sending an RTR message and it receives a regular
  579. * message that matches the id of the RTR message, it will overwrite the
  580. * outgoing message in the TX register. When this happens we must
  581. * process the received message and try to transmit the outgoing skb
  582. * again.
  583. */
  584. if (unlikely(ctrl1 & NEWDAT_SET)) {
  585. cc770_rx(dev, mo, ctrl1);
  586. cc770_tx(dev, mo);
  587. return;
  588. }
  589. can_put_echo_skb(priv->tx_skb, dev, 0, 0);
  590. stats->tx_bytes += can_get_echo_skb(dev, 0, NULL);
  591. stats->tx_packets++;
  592. priv->tx_skb = NULL;
  593. netif_wake_queue(dev);
  594. }
  595. static irqreturn_t cc770_interrupt(int irq, void *dev_id)
  596. {
  597. struct net_device *dev = (struct net_device *)dev_id;
  598. struct cc770_priv *priv = netdev_priv(dev);
  599. u8 intid;
  600. int o, n = 0;
  601. /* Shared interrupts and IRQ off? */
  602. if (priv->can.state == CAN_STATE_STOPPED)
  603. return IRQ_NONE;
  604. if (priv->pre_irq)
  605. priv->pre_irq(priv);
  606. while (n < CC770_MAX_IRQ) {
  607. /* Read the highest pending interrupt request */
  608. intid = cc770_read_reg(priv, interrupt);
  609. if (!intid)
  610. break;
  611. n++;
  612. if (intid == 1) {
  613. /* Exit in case of bus-off */
  614. if (cc770_status_interrupt(dev))
  615. break;
  616. } else {
  617. o = intid2obj(intid);
  618. if (o >= CC770_OBJ_MAX) {
  619. netdev_err(dev, "Unexpected interrupt id %d\n",
  620. intid);
  621. continue;
  622. }
  623. if (priv->obj_flags[o] & CC770_OBJ_FLAG_RTR)
  624. cc770_rtr_interrupt(dev, o);
  625. else if (priv->obj_flags[o] & CC770_OBJ_FLAG_RX)
  626. cc770_rx_interrupt(dev, o);
  627. else
  628. cc770_tx_interrupt(dev, o);
  629. }
  630. }
  631. if (priv->post_irq)
  632. priv->post_irq(priv);
  633. if (n >= CC770_MAX_IRQ)
  634. netdev_dbg(dev, "%d messages handled in ISR", n);
  635. return (n) ? IRQ_HANDLED : IRQ_NONE;
  636. }
  637. static int cc770_open(struct net_device *dev)
  638. {
  639. struct cc770_priv *priv = netdev_priv(dev);
  640. int err;
  641. /* set chip into reset mode */
  642. set_reset_mode(dev);
  643. /* common open */
  644. err = open_candev(dev);
  645. if (err)
  646. return err;
  647. err = request_irq(dev->irq, &cc770_interrupt, priv->irq_flags,
  648. dev->name, dev);
  649. if (err) {
  650. close_candev(dev);
  651. return -EAGAIN;
  652. }
  653. /* init and start chip */
  654. cc770_start(dev);
  655. netif_start_queue(dev);
  656. return 0;
  657. }
  658. static int cc770_close(struct net_device *dev)
  659. {
  660. netif_stop_queue(dev);
  661. set_reset_mode(dev);
  662. free_irq(dev->irq, dev);
  663. close_candev(dev);
  664. return 0;
  665. }
  666. struct net_device *alloc_cc770dev(int sizeof_priv)
  667. {
  668. struct net_device *dev;
  669. struct cc770_priv *priv;
  670. dev = alloc_candev(sizeof(struct cc770_priv) + sizeof_priv,
  671. CC770_ECHO_SKB_MAX);
  672. if (!dev)
  673. return NULL;
  674. priv = netdev_priv(dev);
  675. priv->dev = dev;
  676. priv->can.bittiming_const = &cc770_bittiming_const;
  677. priv->can.do_set_bittiming = cc770_set_bittiming;
  678. priv->can.do_set_mode = cc770_set_mode;
  679. priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES;
  680. priv->tx_skb = NULL;
  681. memcpy(priv->obj_flags, cc770_obj_flags, sizeof(cc770_obj_flags));
  682. if (sizeof_priv)
  683. priv->priv = (void *)priv + sizeof(struct cc770_priv);
  684. return dev;
  685. }
  686. EXPORT_SYMBOL_GPL(alloc_cc770dev);
  687. void free_cc770dev(struct net_device *dev)
  688. {
  689. free_candev(dev);
  690. }
  691. EXPORT_SYMBOL_GPL(free_cc770dev);
  692. static const struct net_device_ops cc770_netdev_ops = {
  693. .ndo_open = cc770_open,
  694. .ndo_stop = cc770_close,
  695. .ndo_start_xmit = cc770_start_xmit,
  696. .ndo_change_mtu = can_change_mtu,
  697. };
  698. static const struct ethtool_ops cc770_ethtool_ops = {
  699. .get_ts_info = ethtool_op_get_ts_info,
  700. };
  701. int register_cc770dev(struct net_device *dev)
  702. {
  703. struct cc770_priv *priv = netdev_priv(dev);
  704. int err;
  705. err = cc770_probe_chip(dev);
  706. if (err)
  707. return err;
  708. dev->netdev_ops = &cc770_netdev_ops;
  709. dev->ethtool_ops = &cc770_ethtool_ops;
  710. dev->flags |= IFF_ECHO; /* we support local echo */
  711. /* Should we use additional functions? */
  712. if (!i82527_compat && priv->control_normal_mode & CTRL_EAF) {
  713. priv->can.do_get_berr_counter = cc770_get_berr_counter;
  714. priv->control_normal_mode = CTRL_IE | CTRL_EAF | CTRL_EIE;
  715. netdev_dbg(dev, "i82527 mode with additional functions\n");
  716. } else {
  717. priv->control_normal_mode = CTRL_IE | CTRL_EIE;
  718. netdev_dbg(dev, "strict i82527 compatibility mode\n");
  719. }
  720. chipset_init(priv);
  721. set_reset_mode(dev);
  722. return register_candev(dev);
  723. }
  724. EXPORT_SYMBOL_GPL(register_cc770dev);
  725. void unregister_cc770dev(struct net_device *dev)
  726. {
  727. set_reset_mode(dev);
  728. unregister_candev(dev);
  729. }
  730. EXPORT_SYMBOL_GPL(unregister_cc770dev);
  731. static __init int cc770_init(void)
  732. {
  733. if (msgobj15_eff) {
  734. cc770_obj_flags[CC770_OBJ_RX0] |= CC770_OBJ_FLAG_EFF;
  735. cc770_obj_flags[CC770_OBJ_RX1] &= ~CC770_OBJ_FLAG_EFF;
  736. }
  737. pr_info("CAN netdevice driver\n");
  738. return 0;
  739. }
  740. module_init(cc770_init);
  741. static __exit void cc770_exit(void)
  742. {
  743. pr_info("driver removed\n");
  744. }
  745. module_exit(cc770_exit);