cc770.c revision 2a367c3a82557cd11a04949ef2160658987fa772
1/* 2 * Core driver for the CC770 and AN82527 CAN controllers 3 * 4 * Copyright (C) 2009, 2011 Wolfgang Grandegger <wg@grandegger.com> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the version 2 of the GNU General Public License 8 * as published by the Free Software Foundation 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 */ 15 16#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 17 18#include <linux/module.h> 19#include <linux/init.h> 20#include <linux/kernel.h> 21#include <linux/sched.h> 22#include <linux/types.h> 23#include <linux/fcntl.h> 24#include <linux/interrupt.h> 25#include <linux/ptrace.h> 26#include <linux/string.h> 27#include <linux/errno.h> 28#include <linux/netdevice.h> 29#include <linux/if_arp.h> 30#include <linux/if_ether.h> 31#include <linux/skbuff.h> 32#include <linux/delay.h> 33 34#include <linux/can.h> 35#include <linux/can/dev.h> 36#include <linux/can/error.h> 37#include <linux/can/dev.h> 38#include <linux/can/platform/cc770.h> 39 40#include "cc770.h" 41 42MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>"); 43MODULE_LICENSE("GPL v2"); 44MODULE_DESCRIPTION(KBUILD_MODNAME "CAN netdevice driver"); 45 46/* 47 * The CC770 is a CAN controller from Bosch, which is 100% compatible 48 * with the AN82527 from Intel, but with "bugs" being fixed and some 49 * additional functionality, mainly: 50 * 51 * 1. RX and TX error counters are readable. 52 * 2. Support of silent (listen-only) mode. 53 * 3. Message object 15 can receive all types of frames, also RTR and EFF. 54 * 55 * Details are available from Bosch's "CC770_Product_Info_2007-01.pdf", 56 * which explains in detail the compatibility between the CC770 and the 57 * 82527. This driver use the additional functionality 3. on real CC770 58 * devices. Unfortunately, the CC770 does still not store the message 59 * identifier of received remote transmission request frames and 60 * therefore it's set to 0. 61 * 62 * The message objects 1..14 can be used for TX and RX while the message 63 * objects 15 is optimized for RX. It has a shadow register for reliable 64 * data receiption under heavy bus load. Therefore it makes sense to use 65 * this message object for the needed use case. The frame type (EFF/SFF) 66 * for the message object 15 can be defined via kernel module parameter 67 * "msgobj15_eff". If not equal 0, it will receive 29-bit EFF frames, 68 * otherwise 11 bit SFF messages. 69 */ 70static int msgobj15_eff; 71module_param(msgobj15_eff, int, S_IRUGO); 72MODULE_PARM_DESC(msgobj15_eff, "Extended 29-bit frames for message object 15 " 73 "(default: 11-bit standard frames)"); 74 75static int i82527_compat; 76module_param(i82527_compat, int, S_IRUGO); 77MODULE_PARM_DESC(i82527_compat, "Strict Intel 82527 comptibility mode " 78 "without using additional functions"); 79 80/* 81 * This driver uses the last 5 message objects 11..15. The definitions 82 * and structure below allows to configure and assign them to the real 83 * message object. 84 */ 85static unsigned char cc770_obj_flags[CC770_OBJ_MAX] = { 86 [CC770_OBJ_RX0] = CC770_OBJ_FLAG_RX, 87 [CC770_OBJ_RX1] = CC770_OBJ_FLAG_RX | CC770_OBJ_FLAG_EFF, 88 [CC770_OBJ_RX_RTR0] = CC770_OBJ_FLAG_RX | CC770_OBJ_FLAG_RTR, 89 [CC770_OBJ_RX_RTR1] = CC770_OBJ_FLAG_RX | CC770_OBJ_FLAG_RTR | 90 CC770_OBJ_FLAG_EFF, 91 [CC770_OBJ_TX] = 0, 92}; 93 94static struct can_bittiming_const cc770_bittiming_const = { 95 .name = KBUILD_MODNAME, 96 .tseg1_min = 1, 97 .tseg1_max = 16, 98 .tseg2_min = 1, 99 .tseg2_max = 8, 100 .sjw_max = 4, 101 .brp_min = 1, 102 .brp_max = 64, 103 .brp_inc = 1, 104}; 105 106static inline int intid2obj(unsigned int intid) 107{ 108 if (intid == 2) 109 return 0; 110 else 111 return MSGOBJ_LAST + 2 - intid; 112} 113 114static void enable_all_objs(const struct net_device *dev) 115{ 116 struct cc770_priv *priv = netdev_priv(dev); 117 u8 msgcfg; 118 unsigned char obj_flags; 119 unsigned int o, mo; 120 121 for (o = 0; o < ARRAY_SIZE(priv->obj_flags); o++) { 122 obj_flags = priv->obj_flags[o]; 123 mo = obj2msgobj(o); 124 125 if (obj_flags & CC770_OBJ_FLAG_RX) { 126 /* 127 * We don't need extra objects for RTR and EFF if 128 * the additional CC770 functions are enabled. 129 */ 130 if (priv->control_normal_mode & CTRL_EAF) { 131 if (o > 0) 132 continue; 133 netdev_dbg(dev, "Message object %d for " 134 "RX data, RTR, SFF and EFF\n", mo); 135 } else { 136 netdev_dbg(dev, 137 "Message object %d for RX %s %s\n", 138 mo, obj_flags & CC770_OBJ_FLAG_RTR ? 139 "RTR" : "data", 140 obj_flags & CC770_OBJ_FLAG_EFF ? 141 "EFF" : "SFF"); 142 } 143 144 if (obj_flags & CC770_OBJ_FLAG_EFF) 145 msgcfg = MSGCFG_XTD; 146 else 147 msgcfg = 0; 148 if (obj_flags & CC770_OBJ_FLAG_RTR) 149 msgcfg |= MSGCFG_DIR; 150 151 cc770_write_reg(priv, msgobj[mo].config, msgcfg); 152 cc770_write_reg(priv, msgobj[mo].ctrl0, 153 MSGVAL_SET | TXIE_RES | 154 RXIE_SET | INTPND_RES); 155 156 if (obj_flags & CC770_OBJ_FLAG_RTR) 157 cc770_write_reg(priv, msgobj[mo].ctrl1, 158 NEWDAT_RES | CPUUPD_SET | 159 TXRQST_RES | RMTPND_RES); 160 else 161 cc770_write_reg(priv, msgobj[mo].ctrl1, 162 NEWDAT_RES | MSGLST_RES | 163 TXRQST_RES | RMTPND_RES); 164 } else { 165 netdev_dbg(dev, "Message object %d for " 166 "TX data, RTR, SFF and EFF\n", mo); 167 168 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 178static void disable_all_objs(const struct cc770_priv *priv) 179{ 180 int o, mo; 181 182 for (o = 0; o < ARRAY_SIZE(priv->obj_flags); o++) { 183 mo = obj2msgobj(o); 184 185 if (priv->obj_flags[o] & CC770_OBJ_FLAG_RX) { 186 if (o > 0 && priv->control_normal_mode & CTRL_EAF) 187 continue; 188 189 cc770_write_reg(priv, msgobj[mo].ctrl1, 190 NEWDAT_RES | MSGLST_RES | 191 TXRQST_RES | RMTPND_RES); 192 cc770_write_reg(priv, msgobj[mo].ctrl0, 193 MSGVAL_RES | TXIE_RES | 194 RXIE_RES | INTPND_RES); 195 } else { 196 /* Clear message object for send */ 197 cc770_write_reg(priv, msgobj[mo].ctrl1, 198 RMTPND_RES | TXRQST_RES | 199 CPUUPD_RES | NEWDAT_RES); 200 cc770_write_reg(priv, msgobj[mo].ctrl0, 201 MSGVAL_RES | TXIE_RES | 202 RXIE_RES | INTPND_RES); 203 } 204 } 205} 206 207static void set_reset_mode(struct net_device *dev) 208{ 209 struct cc770_priv *priv = netdev_priv(dev); 210 211 /* Enable configuration and puts chip in bus-off, disable interrupts */ 212 cc770_write_reg(priv, control, CTRL_CCE | CTRL_INI); 213 214 priv->can.state = CAN_STATE_STOPPED; 215 216 /* Clear interrupts */ 217 cc770_read_reg(priv, interrupt); 218 219 /* Clear status register */ 220 cc770_write_reg(priv, status, 0); 221 222 /* Disable all used message objects */ 223 disable_all_objs(priv); 224} 225 226static void set_normal_mode(struct net_device *dev) 227{ 228 struct cc770_priv *priv = netdev_priv(dev); 229 230 /* Clear interrupts */ 231 cc770_read_reg(priv, interrupt); 232 233 /* Clear status register and pre-set last error code */ 234 cc770_write_reg(priv, status, STAT_LEC_MASK); 235 236 /* Enable all used message objects*/ 237 enable_all_objs(dev); 238 239 /* 240 * Clear bus-off, interrupts only for errors, 241 * not for status change 242 */ 243 cc770_write_reg(priv, control, priv->control_normal_mode); 244 245 priv->can.state = CAN_STATE_ERROR_ACTIVE; 246} 247 248static void chipset_init(struct cc770_priv *priv) 249{ 250 int mo, id, data; 251 252 /* Enable configuration and put chip in bus-off, disable interrupts */ 253 cc770_write_reg(priv, control, (CTRL_CCE | CTRL_INI)); 254 255 /* Set CLKOUT divider and slew rates */ 256 cc770_write_reg(priv, clkout, priv->clkout); 257 258 /* Configure CPU interface / CLKOUT enable */ 259 cc770_write_reg(priv, cpu_interface, priv->cpu_interface); 260 261 /* Set bus configuration */ 262 cc770_write_reg(priv, bus_config, priv->bus_config); 263 264 /* Clear interrupts */ 265 cc770_read_reg(priv, interrupt); 266 267 /* Clear status register */ 268 cc770_write_reg(priv, status, 0); 269 270 /* Clear and invalidate message objects */ 271 for (mo = MSGOBJ_FIRST; mo <= MSGOBJ_LAST; mo++) { 272 cc770_write_reg(priv, msgobj[mo].ctrl0, 273 INTPND_UNC | RXIE_RES | 274 TXIE_RES | MSGVAL_RES); 275 cc770_write_reg(priv, msgobj[mo].ctrl0, 276 INTPND_RES | RXIE_RES | 277 TXIE_RES | MSGVAL_RES); 278 cc770_write_reg(priv, msgobj[mo].ctrl1, 279 NEWDAT_RES | MSGLST_RES | 280 TXRQST_RES | RMTPND_RES); 281 for (data = 0; data < 8; data++) 282 cc770_write_reg(priv, msgobj[mo].data[data], 0); 283 for (id = 0; id < 4; id++) 284 cc770_write_reg(priv, msgobj[mo].id[id], 0); 285 cc770_write_reg(priv, msgobj[mo].config, 0); 286 } 287 288 /* Set all global ID masks to "don't care" */ 289 cc770_write_reg(priv, global_mask_std[0], 0); 290 cc770_write_reg(priv, global_mask_std[1], 0); 291 cc770_write_reg(priv, global_mask_ext[0], 0); 292 cc770_write_reg(priv, global_mask_ext[1], 0); 293 cc770_write_reg(priv, global_mask_ext[2], 0); 294 cc770_write_reg(priv, global_mask_ext[3], 0); 295 296} 297 298static int cc770_probe_chip(struct net_device *dev) 299{ 300 struct cc770_priv *priv = netdev_priv(dev); 301 302 /* Enable configuration, put chip in bus-off, disable ints */ 303 cc770_write_reg(priv, control, CTRL_CCE | CTRL_EAF | CTRL_INI); 304 /* Configure cpu interface / CLKOUT disable */ 305 cc770_write_reg(priv, cpu_interface, priv->cpu_interface); 306 307 /* 308 * Check if hardware reset is still inactive or maybe there 309 * is no chip in this address space 310 */ 311 if (cc770_read_reg(priv, cpu_interface) & CPUIF_RST) { 312 netdev_info(dev, "probing @0x%p failed (reset)\n", 313 priv->reg_base); 314 return -ENODEV; 315 } 316 317 /* Write and read back test pattern (some arbitrary values) */ 318 cc770_write_reg(priv, msgobj[1].data[1], 0x25); 319 cc770_write_reg(priv, msgobj[2].data[3], 0x52); 320 cc770_write_reg(priv, msgobj[10].data[6], 0xc3); 321 if ((cc770_read_reg(priv, msgobj[1].data[1]) != 0x25) || 322 (cc770_read_reg(priv, msgobj[2].data[3]) != 0x52) || 323 (cc770_read_reg(priv, msgobj[10].data[6]) != 0xc3)) { 324 netdev_info(dev, "probing @0x%p failed (pattern)\n", 325 priv->reg_base); 326 return -ENODEV; 327 } 328 329 /* Check if this chip is a CC770 supporting additional functions */ 330 if (cc770_read_reg(priv, control) & CTRL_EAF) 331 priv->control_normal_mode |= CTRL_EAF; 332 333 return 0; 334} 335 336static void cc770_start(struct net_device *dev) 337{ 338 struct cc770_priv *priv = netdev_priv(dev); 339 340 /* leave reset mode */ 341 if (priv->can.state != CAN_STATE_STOPPED) 342 set_reset_mode(dev); 343 344 /* leave reset mode */ 345 set_normal_mode(dev); 346} 347 348static int cc770_set_mode(struct net_device *dev, enum can_mode mode) 349{ 350 switch (mode) { 351 case CAN_MODE_START: 352 cc770_start(dev); 353 netif_wake_queue(dev); 354 break; 355 356 default: 357 return -EOPNOTSUPP; 358 } 359 360 return 0; 361} 362 363static int cc770_set_bittiming(struct net_device *dev) 364{ 365 struct cc770_priv *priv = netdev_priv(dev); 366 struct can_bittiming *bt = &priv->can.bittiming; 367 u8 btr0, btr1; 368 369 btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6); 370 btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) | 371 (((bt->phase_seg2 - 1) & 0x7) << 4); 372 if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) 373 btr1 |= 0x80; 374 375 netdev_info(dev, "setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1); 376 377 cc770_write_reg(priv, bit_timing_0, btr0); 378 cc770_write_reg(priv, bit_timing_1, btr1); 379 380 return 0; 381} 382 383static int cc770_get_berr_counter(const struct net_device *dev, 384 struct can_berr_counter *bec) 385{ 386 struct cc770_priv *priv = netdev_priv(dev); 387 388 bec->txerr = cc770_read_reg(priv, tx_error_counter); 389 bec->rxerr = cc770_read_reg(priv, rx_error_counter); 390 391 return 0; 392} 393 394static netdev_tx_t cc770_start_xmit(struct sk_buff *skb, struct net_device *dev) 395{ 396 struct cc770_priv *priv = netdev_priv(dev); 397 struct net_device_stats *stats = &dev->stats; 398 struct can_frame *cf = (struct can_frame *)skb->data; 399 unsigned int mo = obj2msgobj(CC770_OBJ_TX); 400 u8 dlc, rtr; 401 u32 id; 402 int i; 403 404 if (can_dropped_invalid_skb(dev, skb)) 405 return NETDEV_TX_OK; 406 407 if ((cc770_read_reg(priv, 408 msgobj[mo].ctrl1) & TXRQST_UNC) == TXRQST_SET) { 409 netdev_err(dev, "TX register is still occupied!\n"); 410 return NETDEV_TX_BUSY; 411 } 412 413 netif_stop_queue(dev); 414 415 dlc = cf->can_dlc; 416 id = cf->can_id; 417 if (cf->can_id & CAN_RTR_FLAG) 418 rtr = 0; 419 else 420 rtr = MSGCFG_DIR; 421 cc770_write_reg(priv, msgobj[mo].ctrl1, 422 RMTPND_RES | TXRQST_RES | CPUUPD_SET | NEWDAT_RES); 423 cc770_write_reg(priv, msgobj[mo].ctrl0, 424 MSGVAL_SET | TXIE_SET | RXIE_RES | INTPND_RES); 425 if (id & CAN_EFF_FLAG) { 426 id &= CAN_EFF_MASK; 427 cc770_write_reg(priv, msgobj[mo].config, 428 (dlc << 4) | rtr | MSGCFG_XTD); 429 cc770_write_reg(priv, msgobj[mo].id[3], id << 3); 430 cc770_write_reg(priv, msgobj[mo].id[2], id >> 5); 431 cc770_write_reg(priv, msgobj[mo].id[1], id >> 13); 432 cc770_write_reg(priv, msgobj[mo].id[0], id >> 21); 433 } else { 434 id &= CAN_SFF_MASK; 435 cc770_write_reg(priv, msgobj[mo].config, (dlc << 4) | rtr); 436 cc770_write_reg(priv, msgobj[mo].id[0], id >> 3); 437 cc770_write_reg(priv, msgobj[mo].id[1], id << 5); 438 } 439 440 for (i = 0; i < dlc; i++) 441 cc770_write_reg(priv, msgobj[mo].data[i], cf->data[i]); 442 443 cc770_write_reg(priv, msgobj[mo].ctrl1, 444 RMTPND_RES | TXRQST_SET | CPUUPD_RES | NEWDAT_UNC); 445 446 stats->tx_bytes += dlc; 447 448 can_put_echo_skb(skb, dev, 0); 449 450 /* 451 * HM: We had some cases of repeated IRQs so make sure the 452 * INT is acknowledged I know it's already further up, but 453 * doing again fixed the issue 454 */ 455 cc770_write_reg(priv, msgobj[mo].ctrl0, 456 MSGVAL_UNC | TXIE_UNC | RXIE_UNC | INTPND_RES); 457 458 return NETDEV_TX_OK; 459} 460 461static void cc770_rx(struct net_device *dev, unsigned int mo, u8 ctrl1) 462{ 463 struct cc770_priv *priv = netdev_priv(dev); 464 struct net_device_stats *stats = &dev->stats; 465 struct can_frame *cf; 466 struct sk_buff *skb; 467 u8 config; 468 u32 id; 469 int i; 470 471 skb = alloc_can_skb(dev, &cf); 472 if (!skb) 473 return; 474 475 config = cc770_read_reg(priv, msgobj[mo].config); 476 477 if (ctrl1 & RMTPND_SET) { 478 /* 479 * Unfortunately, the chip does not store the real message 480 * identifier of the received remote transmission request 481 * frame. Therefore we set it to 0. 482 */ 483 cf->can_id = CAN_RTR_FLAG; 484 if (config & MSGCFG_XTD) 485 cf->can_id |= CAN_EFF_FLAG; 486 cf->can_dlc = 0; 487 } else { 488 if (config & MSGCFG_XTD) { 489 id = cc770_read_reg(priv, msgobj[mo].id[3]); 490 id |= cc770_read_reg(priv, msgobj[mo].id[2]) << 8; 491 id |= cc770_read_reg(priv, msgobj[mo].id[1]) << 16; 492 id |= cc770_read_reg(priv, msgobj[mo].id[0]) << 24; 493 id >>= 3; 494 id |= CAN_EFF_FLAG; 495 } else { 496 id = cc770_read_reg(priv, msgobj[mo].id[1]); 497 id |= cc770_read_reg(priv, msgobj[mo].id[0]) << 8; 498 id >>= 5; 499 } 500 501 cf->can_id = id; 502 cf->can_dlc = get_can_dlc((config & 0xf0) >> 4); 503 for (i = 0; i < cf->can_dlc; i++) 504 cf->data[i] = cc770_read_reg(priv, msgobj[mo].data[i]); 505 } 506 netif_rx(skb); 507 508 stats->rx_packets++; 509 stats->rx_bytes += cf->can_dlc; 510} 511 512static int cc770_err(struct net_device *dev, u8 status) 513{ 514 struct cc770_priv *priv = netdev_priv(dev); 515 struct net_device_stats *stats = &dev->stats; 516 struct can_frame *cf; 517 struct sk_buff *skb; 518 u8 lec; 519 520 netdev_dbg(dev, "status interrupt (%#x)\n", status); 521 522 skb = alloc_can_err_skb(dev, &cf); 523 if (!skb) 524 return -ENOMEM; 525 526 /* Use extended functions of the CC770 */ 527 if (priv->control_normal_mode & CTRL_EAF) { 528 cf->data[6] = cc770_read_reg(priv, tx_error_counter); 529 cf->data[7] = cc770_read_reg(priv, rx_error_counter); 530 } 531 532 if (status & STAT_BOFF) { 533 /* Disable interrupts */ 534 cc770_write_reg(priv, control, CTRL_INI); 535 cf->can_id |= CAN_ERR_BUSOFF; 536 priv->can.state = CAN_STATE_BUS_OFF; 537 can_bus_off(dev); 538 } else if (status & STAT_WARN) { 539 cf->can_id |= CAN_ERR_CRTL; 540 /* Only the CC770 does show error passive */ 541 if (cf->data[7] > 127) { 542 cf->data[1] = CAN_ERR_CRTL_RX_PASSIVE | 543 CAN_ERR_CRTL_TX_PASSIVE; 544 priv->can.state = CAN_STATE_ERROR_PASSIVE; 545 priv->can.can_stats.error_passive++; 546 } else { 547 cf->data[1] = CAN_ERR_CRTL_RX_WARNING | 548 CAN_ERR_CRTL_TX_WARNING; 549 priv->can.state = CAN_STATE_ERROR_WARNING; 550 priv->can.can_stats.error_warning++; 551 } 552 } else { 553 /* Back to error avtive */ 554 cf->can_id |= CAN_ERR_PROT; 555 cf->data[2] = CAN_ERR_PROT_ACTIVE; 556 priv->can.state = CAN_STATE_ERROR_ACTIVE; 557 } 558 559 lec = status & STAT_LEC_MASK; 560 if (lec < 7 && lec > 0) { 561 if (lec == STAT_LEC_ACK) { 562 cf->can_id |= CAN_ERR_ACK; 563 } else { 564 cf->can_id |= CAN_ERR_PROT; 565 switch (lec) { 566 case STAT_LEC_STUFF: 567 cf->data[2] |= CAN_ERR_PROT_STUFF; 568 break; 569 case STAT_LEC_FORM: 570 cf->data[2] |= CAN_ERR_PROT_FORM; 571 break; 572 case STAT_LEC_BIT1: 573 cf->data[2] |= CAN_ERR_PROT_BIT1; 574 break; 575 case STAT_LEC_BIT0: 576 cf->data[2] |= CAN_ERR_PROT_BIT0; 577 break; 578 case STAT_LEC_CRC: 579 cf->data[3] |= CAN_ERR_PROT_LOC_CRC_SEQ; 580 break; 581 } 582 } 583 } 584 585 netif_rx(skb); 586 587 stats->rx_packets++; 588 stats->rx_bytes += cf->can_dlc; 589 590 return 0; 591} 592 593static int cc770_status_interrupt(struct net_device *dev) 594{ 595 struct cc770_priv *priv = netdev_priv(dev); 596 u8 status; 597 598 status = cc770_read_reg(priv, status); 599 /* Reset the status register including RXOK and TXOK */ 600 cc770_write_reg(priv, status, STAT_LEC_MASK); 601 602 if (status & (STAT_WARN | STAT_BOFF) || 603 (status & STAT_LEC_MASK) != STAT_LEC_MASK) { 604 cc770_err(dev, status); 605 return status & STAT_BOFF; 606 } 607 608 return 0; 609} 610 611static void cc770_rx_interrupt(struct net_device *dev, unsigned int o) 612{ 613 struct cc770_priv *priv = netdev_priv(dev); 614 struct net_device_stats *stats = &dev->stats; 615 unsigned int mo = obj2msgobj(o); 616 u8 ctrl1; 617 int n = CC770_MAX_MSG; 618 619 while (n--) { 620 ctrl1 = cc770_read_reg(priv, msgobj[mo].ctrl1); 621 622 if (!(ctrl1 & NEWDAT_SET)) { 623 /* Check for RTR if additional functions are enabled */ 624 if (priv->control_normal_mode & CTRL_EAF) { 625 if (!(cc770_read_reg(priv, msgobj[mo].ctrl0) & 626 INTPND_SET)) 627 break; 628 } else { 629 break; 630 } 631 } 632 633 if (ctrl1 & MSGLST_SET) { 634 stats->rx_over_errors++; 635 stats->rx_errors++; 636 } 637 if (mo < MSGOBJ_LAST) 638 cc770_write_reg(priv, msgobj[mo].ctrl1, 639 NEWDAT_RES | MSGLST_RES | 640 TXRQST_UNC | RMTPND_UNC); 641 cc770_rx(dev, mo, ctrl1); 642 643 cc770_write_reg(priv, msgobj[mo].ctrl0, 644 MSGVAL_SET | TXIE_RES | 645 RXIE_SET | INTPND_RES); 646 cc770_write_reg(priv, msgobj[mo].ctrl1, 647 NEWDAT_RES | MSGLST_RES | 648 TXRQST_RES | RMTPND_RES); 649 } 650} 651 652static void cc770_rtr_interrupt(struct net_device *dev, unsigned int o) 653{ 654 struct cc770_priv *priv = netdev_priv(dev); 655 unsigned int mo = obj2msgobj(o); 656 u8 ctrl0, ctrl1; 657 int n = CC770_MAX_MSG; 658 659 while (n--) { 660 ctrl0 = cc770_read_reg(priv, msgobj[mo].ctrl0); 661 if (!(ctrl0 & INTPND_SET)) 662 break; 663 664 ctrl1 = cc770_read_reg(priv, msgobj[mo].ctrl1); 665 cc770_rx(dev, mo, ctrl1); 666 667 cc770_write_reg(priv, msgobj[mo].ctrl0, 668 MSGVAL_SET | TXIE_RES | 669 RXIE_SET | INTPND_RES); 670 cc770_write_reg(priv, msgobj[mo].ctrl1, 671 NEWDAT_RES | CPUUPD_SET | 672 TXRQST_RES | RMTPND_RES); 673 } 674} 675 676static void cc770_tx_interrupt(struct net_device *dev, unsigned int o) 677{ 678 struct cc770_priv *priv = netdev_priv(dev); 679 struct net_device_stats *stats = &dev->stats; 680 unsigned int mo = obj2msgobj(o); 681 682 /* Nothing more to send, switch off interrupts */ 683 cc770_write_reg(priv, msgobj[mo].ctrl0, 684 MSGVAL_RES | TXIE_RES | RXIE_RES | INTPND_RES); 685 /* 686 * We had some cases of repeated IRQ so make sure the 687 * INT is acknowledged 688 */ 689 cc770_write_reg(priv, msgobj[mo].ctrl0, 690 MSGVAL_UNC | TXIE_UNC | RXIE_UNC | INTPND_RES); 691 692 stats->tx_packets++; 693 can_get_echo_skb(dev, 0); 694 netif_wake_queue(dev); 695} 696 697irqreturn_t cc770_interrupt(int irq, void *dev_id) 698{ 699 struct net_device *dev = (struct net_device *)dev_id; 700 struct cc770_priv *priv = netdev_priv(dev); 701 u8 intid; 702 int o, n = 0; 703 704 /* Shared interrupts and IRQ off? */ 705 if (priv->can.state == CAN_STATE_STOPPED) 706 return IRQ_NONE; 707 708 if (priv->pre_irq) 709 priv->pre_irq(priv); 710 711 while (n < CC770_MAX_IRQ) { 712 /* Read the highest pending interrupt request */ 713 intid = cc770_read_reg(priv, interrupt); 714 if (!intid) 715 break; 716 n++; 717 718 if (intid == 1) { 719 /* Exit in case of bus-off */ 720 if (cc770_status_interrupt(dev)) 721 break; 722 } else { 723 o = intid2obj(intid); 724 725 if (o >= CC770_OBJ_MAX) { 726 netdev_err(dev, "Unexpected interrupt id %d\n", 727 intid); 728 continue; 729 } 730 731 if (priv->obj_flags[o] & CC770_OBJ_FLAG_RTR) 732 cc770_rtr_interrupt(dev, o); 733 else if (priv->obj_flags[o] & CC770_OBJ_FLAG_RX) 734 cc770_rx_interrupt(dev, o); 735 else 736 cc770_tx_interrupt(dev, o); 737 } 738 } 739 740 if (priv->post_irq) 741 priv->post_irq(priv); 742 743 if (n >= CC770_MAX_IRQ) 744 netdev_dbg(dev, "%d messages handled in ISR", n); 745 746 return (n) ? IRQ_HANDLED : IRQ_NONE; 747} 748 749static int cc770_open(struct net_device *dev) 750{ 751 struct cc770_priv *priv = netdev_priv(dev); 752 int err; 753 754 /* set chip into reset mode */ 755 set_reset_mode(dev); 756 757 /* common open */ 758 err = open_candev(dev); 759 if (err) 760 return err; 761 762 err = request_irq(dev->irq, &cc770_interrupt, priv->irq_flags, 763 dev->name, dev); 764 if (err) { 765 close_candev(dev); 766 return -EAGAIN; 767 } 768 769 /* init and start chip */ 770 cc770_start(dev); 771 772 netif_start_queue(dev); 773 774 return 0; 775} 776 777static int cc770_close(struct net_device *dev) 778{ 779 netif_stop_queue(dev); 780 set_reset_mode(dev); 781 782 free_irq(dev->irq, dev); 783 close_candev(dev); 784 785 return 0; 786} 787 788struct net_device *alloc_cc770dev(int sizeof_priv) 789{ 790 struct net_device *dev; 791 struct cc770_priv *priv; 792 793 dev = alloc_candev(sizeof(struct cc770_priv) + sizeof_priv, 794 CC770_ECHO_SKB_MAX); 795 if (!dev) 796 return NULL; 797 798 priv = netdev_priv(dev); 799 800 priv->dev = dev; 801 priv->can.bittiming_const = &cc770_bittiming_const; 802 priv->can.do_set_bittiming = cc770_set_bittiming; 803 priv->can.do_set_mode = cc770_set_mode; 804 priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES; 805 806 memcpy(priv->obj_flags, cc770_obj_flags, sizeof(cc770_obj_flags)); 807 808 if (sizeof_priv) 809 priv->priv = (void *)priv + sizeof(struct cc770_priv); 810 811 return dev; 812} 813EXPORT_SYMBOL_GPL(alloc_cc770dev); 814 815void free_cc770dev(struct net_device *dev) 816{ 817 free_candev(dev); 818} 819EXPORT_SYMBOL_GPL(free_cc770dev); 820 821static const struct net_device_ops cc770_netdev_ops = { 822 .ndo_open = cc770_open, 823 .ndo_stop = cc770_close, 824 .ndo_start_xmit = cc770_start_xmit, 825}; 826 827int register_cc770dev(struct net_device *dev) 828{ 829 struct cc770_priv *priv = netdev_priv(dev); 830 int err; 831 832 err = cc770_probe_chip(dev); 833 if (err) 834 return err; 835 836 dev->netdev_ops = &cc770_netdev_ops; 837 838 dev->flags |= IFF_ECHO; /* we support local echo */ 839 840 /* Should we use additional functions? */ 841 if (!i82527_compat && priv->control_normal_mode & CTRL_EAF) { 842 priv->can.do_get_berr_counter = cc770_get_berr_counter; 843 priv->control_normal_mode = CTRL_IE | CTRL_EAF | CTRL_EIE; 844 netdev_dbg(dev, "i82527 mode with additional functions\n"); 845 } else { 846 priv->control_normal_mode = CTRL_IE | CTRL_EIE; 847 netdev_dbg(dev, "strict i82527 compatibility mode\n"); 848 } 849 850 chipset_init(priv); 851 set_reset_mode(dev); 852 853 return register_candev(dev); 854} 855EXPORT_SYMBOL_GPL(register_cc770dev); 856 857void unregister_cc770dev(struct net_device *dev) 858{ 859 set_reset_mode(dev); 860 unregister_candev(dev); 861} 862EXPORT_SYMBOL_GPL(unregister_cc770dev); 863 864static __init int cc770_init(void) 865{ 866 if (msgobj15_eff) { 867 cc770_obj_flags[CC770_OBJ_RX0] |= CC770_OBJ_FLAG_EFF; 868 cc770_obj_flags[CC770_OBJ_RX1] &= ~CC770_OBJ_FLAG_EFF; 869 } 870 871 pr_info("CAN netdevice driver\n"); 872 873 return 0; 874} 875module_init(cc770_init); 876 877static __exit void cc770_exit(void) 878{ 879 pr_info("driver removed\n"); 880} 881module_exit(cc770_exit); 882