1 /* 2 * CAN bus driver for the alone generic (as possible as) MSCAN controller. 3 * 4 * Copyright (C) 2005-2006 Andrey Volkov <avolkov@varma-el.com>, 5 * Varma Electronics Oy 6 * Copyright (C) 2008-2009 Wolfgang Grandegger <wg@grandegger.com> 7 * Copyright (C) 2008-2009 Pengutronix <kernel@pengutronix.de> 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the version 2 of the GNU General Public License 11 * as published by the Free Software Foundation 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, see <http://www.gnu.org/licenses/>. 20 */ 21 22 #include <linux/kernel.h> 23 #include <linux/module.h> 24 #include <linux/interrupt.h> 25 #include <linux/delay.h> 26 #include <linux/netdevice.h> 27 #include <linux/if_arp.h> 28 #include <linux/if_ether.h> 29 #include <linux/list.h> 30 #include <linux/can/dev.h> 31 #include <linux/can/error.h> 32 #include <linux/io.h> 33 34 #include "mscan.h" 35 36 static const struct can_bittiming_const mscan_bittiming_const = { 37 .name = "mscan", 38 .tseg1_min = 4, 39 .tseg1_max = 16, 40 .tseg2_min = 2, 41 .tseg2_max = 8, 42 .sjw_max = 4, 43 .brp_min = 1, 44 .brp_max = 64, 45 .brp_inc = 1, 46 }; 47 48 struct mscan_state { 49 u8 mode; 50 u8 canrier; 51 u8 cantier; 52 }; 53 54 static enum can_state state_map[] = { 55 CAN_STATE_ERROR_ACTIVE, 56 CAN_STATE_ERROR_WARNING, 57 CAN_STATE_ERROR_PASSIVE, 58 CAN_STATE_BUS_OFF 59 }; 60 61 static int mscan_set_mode(struct net_device *dev, u8 mode) 62 { 63 struct mscan_priv *priv = netdev_priv(dev); 64 struct mscan_regs __iomem *regs = priv->reg_base; 65 int ret = 0; 66 int i; 67 u8 canctl1; 68 69 if (mode != MSCAN_NORMAL_MODE) { 70 if (priv->tx_active) { 71 /* Abort transfers before going to sleep */# 72 out_8(®s->cantarq, priv->tx_active); 73 /* Suppress TX done interrupts */ 74 out_8(®s->cantier, 0); 75 } 76 77 canctl1 = in_8(®s->canctl1); 78 if ((mode & MSCAN_SLPRQ) && !(canctl1 & MSCAN_SLPAK)) { 79 setbits8(®s->canctl0, MSCAN_SLPRQ); 80 for (i = 0; i < MSCAN_SET_MODE_RETRIES; i++) { 81 if (in_8(®s->canctl1) & MSCAN_SLPAK) 82 break; 83 udelay(100); 84 } 85 /* 86 * The mscan controller will fail to enter sleep mode, 87 * while there are irregular activities on bus, like 88 * somebody keeps retransmitting. This behavior is 89 * undocumented and seems to differ between mscan built 90 * in mpc5200b and mpc5200. We proceed in that case, 91 * since otherwise the slprq will be kept set and the 92 * controller will get stuck. NOTE: INITRQ or CSWAI 93 * will abort all active transmit actions, if still 94 * any, at once. 95 */ 96 if (i >= MSCAN_SET_MODE_RETRIES) 97 netdev_dbg(dev, 98 "device failed to enter sleep mode. " 99 "We proceed anyhow.\n"); 100 else 101 priv->can.state = CAN_STATE_SLEEPING; 102 } 103 104 if ((mode & MSCAN_INITRQ) && !(canctl1 & MSCAN_INITAK)) { 105 setbits8(®s->canctl0, MSCAN_INITRQ); 106 for (i = 0; i < MSCAN_SET_MODE_RETRIES; i++) { 107 if (in_8(®s->canctl1) & MSCAN_INITAK) 108 break; 109 } 110 if (i >= MSCAN_SET_MODE_RETRIES) 111 ret = -ENODEV; 112 } 113 if (!ret) 114 priv->can.state = CAN_STATE_STOPPED; 115 116 if (mode & MSCAN_CSWAI) 117 setbits8(®s->canctl0, MSCAN_CSWAI); 118 119 } else { 120 canctl1 = in_8(®s->canctl1); 121 if (canctl1 & (MSCAN_SLPAK | MSCAN_INITAK)) { 122 clrbits8(®s->canctl0, MSCAN_SLPRQ | MSCAN_INITRQ); 123 for (i = 0; i < MSCAN_SET_MODE_RETRIES; i++) { 124 canctl1 = in_8(®s->canctl1); 125 if (!(canctl1 & (MSCAN_INITAK | MSCAN_SLPAK))) 126 break; 127 } 128 if (i >= MSCAN_SET_MODE_RETRIES) 129 ret = -ENODEV; 130 else 131 priv->can.state = CAN_STATE_ERROR_ACTIVE; 132 } 133 } 134 return ret; 135 } 136 137 static int mscan_start(struct net_device *dev) 138 { 139 struct mscan_priv *priv = netdev_priv(dev); 140 struct mscan_regs __iomem *regs = priv->reg_base; 141 u8 canrflg; 142 int err; 143 144 out_8(®s->canrier, 0); 145 146 INIT_LIST_HEAD(&priv->tx_head); 147 priv->prev_buf_id = 0; 148 priv->cur_pri = 0; 149 priv->tx_active = 0; 150 priv->shadow_canrier = 0; 151 priv->flags = 0; 152 153 if (priv->type == MSCAN_TYPE_MPC5121) { 154 /* Clear pending bus-off condition */ 155 if (in_8(®s->canmisc) & MSCAN_BOHOLD) 156 out_8(®s->canmisc, MSCAN_BOHOLD); 157 } 158 159 err = mscan_set_mode(dev, MSCAN_NORMAL_MODE); 160 if (err) 161 return err; 162 163 canrflg = in_8(®s->canrflg); 164 priv->shadow_statflg = canrflg & MSCAN_STAT_MSK; 165 priv->can.state = state_map[max(MSCAN_STATE_RX(canrflg), 166 MSCAN_STATE_TX(canrflg))]; 167 out_8(®s->cantier, 0); 168 169 /* Enable receive interrupts. */ 170 out_8(®s->canrier, MSCAN_RX_INTS_ENABLE); 171 172 return 0; 173 } 174 175 static int mscan_restart(struct net_device *dev) 176 { 177 struct mscan_priv *priv = netdev_priv(dev); 178 179 if (priv->type == MSCAN_TYPE_MPC5121) { 180 struct mscan_regs __iomem *regs = priv->reg_base; 181 182 priv->can.state = CAN_STATE_ERROR_ACTIVE; 183 WARN(!(in_8(®s->canmisc) & MSCAN_BOHOLD), 184 "bus-off state expected\n"); 185 out_8(®s->canmisc, MSCAN_BOHOLD); 186 /* Re-enable receive interrupts. */ 187 out_8(®s->canrier, MSCAN_RX_INTS_ENABLE); 188 } else { 189 if (priv->can.state <= CAN_STATE_BUS_OFF) 190 mscan_set_mode(dev, MSCAN_INIT_MODE); 191 return mscan_start(dev); 192 } 193 194 return 0; 195 } 196 197 static netdev_tx_t mscan_start_xmit(struct sk_buff *skb, struct net_device *dev) 198 { 199 struct can_frame *frame = (struct can_frame *)skb->data; 200 struct mscan_priv *priv = netdev_priv(dev); 201 struct mscan_regs __iomem *regs = priv->reg_base; 202 int i, rtr, buf_id; 203 u32 can_id; 204 205 if (can_dropped_invalid_skb(dev, skb)) 206 return NETDEV_TX_OK; 207 208 out_8(®s->cantier, 0); 209 210 i = ~priv->tx_active & MSCAN_TXE; 211 buf_id = ffs(i) - 1; 212 switch (hweight8(i)) { 213 case 0: 214 netif_stop_queue(dev); 215 netdev_err(dev, "Tx Ring full when queue awake!\n"); 216 return NETDEV_TX_BUSY; 217 case 1: 218 /* 219 * if buf_id < 3, then current frame will be send out of order, 220 * since buffer with lower id have higher priority (hell..) 221 */ 222 netif_stop_queue(dev); 223 case 2: 224 if (buf_id < priv->prev_buf_id) { 225 priv->cur_pri++; 226 if (priv->cur_pri == 0xff) { 227 set_bit(F_TX_WAIT_ALL, &priv->flags); 228 netif_stop_queue(dev); 229 } 230 } 231 set_bit(F_TX_PROGRESS, &priv->flags); 232 break; 233 } 234 priv->prev_buf_id = buf_id; 235 out_8(®s->cantbsel, i); 236 237 rtr = frame->can_id & CAN_RTR_FLAG; 238 239 /* RTR is always the lowest bit of interest, then IDs follow */ 240 if (frame->can_id & CAN_EFF_FLAG) { 241 can_id = (frame->can_id & CAN_EFF_MASK) 242 << (MSCAN_EFF_RTR_SHIFT + 1); 243 if (rtr) 244 can_id |= 1 << MSCAN_EFF_RTR_SHIFT; 245 out_be16(®s->tx.idr3_2, can_id); 246 247 can_id >>= 16; 248 /* EFF_FLAGS are between the IDs :( */ 249 can_id = (can_id & 0x7) | ((can_id << 2) & 0xffe0) 250 | MSCAN_EFF_FLAGS; 251 } else { 252 can_id = (frame->can_id & CAN_SFF_MASK) 253 << (MSCAN_SFF_RTR_SHIFT + 1); 254 if (rtr) 255 can_id |= 1 << MSCAN_SFF_RTR_SHIFT; 256 } 257 out_be16(®s->tx.idr1_0, can_id); 258 259 if (!rtr) { 260 void __iomem *data = ®s->tx.dsr1_0; 261 u16 *payload = (u16 *)frame->data; 262 263 for (i = 0; i < frame->can_dlc / 2; i++) { 264 out_be16(data, *payload++); 265 data += 2 + _MSCAN_RESERVED_DSR_SIZE; 266 } 267 /* write remaining byte if necessary */ 268 if (frame->can_dlc & 1) 269 out_8(data, frame->data[frame->can_dlc - 1]); 270 } 271 272 out_8(®s->tx.dlr, frame->can_dlc); 273 out_8(®s->tx.tbpr, priv->cur_pri); 274 275 /* Start transmission. */ 276 out_8(®s->cantflg, 1 << buf_id); 277 278 if (!test_bit(F_TX_PROGRESS, &priv->flags)) 279 dev->trans_start = jiffies; 280 281 list_add_tail(&priv->tx_queue[buf_id].list, &priv->tx_head); 282 283 can_put_echo_skb(skb, dev, buf_id); 284 285 /* Enable interrupt. */ 286 priv->tx_active |= 1 << buf_id; 287 out_8(®s->cantier, priv->tx_active); 288 289 return NETDEV_TX_OK; 290 } 291 292 /* This function returns the old state to see where we came from */ 293 static enum can_state check_set_state(struct net_device *dev, u8 canrflg) 294 { 295 struct mscan_priv *priv = netdev_priv(dev); 296 enum can_state state, old_state = priv->can.state; 297 298 if (canrflg & MSCAN_CSCIF && old_state <= CAN_STATE_BUS_OFF) { 299 state = state_map[max(MSCAN_STATE_RX(canrflg), 300 MSCAN_STATE_TX(canrflg))]; 301 priv->can.state = state; 302 } 303 return old_state; 304 } 305 306 static void mscan_get_rx_frame(struct net_device *dev, struct can_frame *frame) 307 { 308 struct mscan_priv *priv = netdev_priv(dev); 309 struct mscan_regs __iomem *regs = priv->reg_base; 310 u32 can_id; 311 int i; 312 313 can_id = in_be16(®s->rx.idr1_0); 314 if (can_id & (1 << 3)) { 315 frame->can_id = CAN_EFF_FLAG; 316 can_id = ((can_id << 16) | in_be16(®s->rx.idr3_2)); 317 can_id = ((can_id & 0xffe00000) | 318 ((can_id & 0x7ffff) << 2)) >> 2; 319 } else { 320 can_id >>= 4; 321 frame->can_id = 0; 322 } 323 324 frame->can_id |= can_id >> 1; 325 if (can_id & 1) 326 frame->can_id |= CAN_RTR_FLAG; 327 328 frame->can_dlc = get_can_dlc(in_8(®s->rx.dlr) & 0xf); 329 330 if (!(frame->can_id & CAN_RTR_FLAG)) { 331 void __iomem *data = ®s->rx.dsr1_0; 332 u16 *payload = (u16 *)frame->data; 333 334 for (i = 0; i < frame->can_dlc / 2; i++) { 335 *payload++ = in_be16(data); 336 data += 2 + _MSCAN_RESERVED_DSR_SIZE; 337 } 338 /* read remaining byte if necessary */ 339 if (frame->can_dlc & 1) 340 frame->data[frame->can_dlc - 1] = in_8(data); 341 } 342 343 out_8(®s->canrflg, MSCAN_RXF); 344 } 345 346 static void mscan_get_err_frame(struct net_device *dev, struct can_frame *frame, 347 u8 canrflg) 348 { 349 struct mscan_priv *priv = netdev_priv(dev); 350 struct mscan_regs __iomem *regs = priv->reg_base; 351 struct net_device_stats *stats = &dev->stats; 352 enum can_state old_state; 353 354 netdev_dbg(dev, "error interrupt (canrflg=%#x)\n", canrflg); 355 frame->can_id = CAN_ERR_FLAG; 356 357 if (canrflg & MSCAN_OVRIF) { 358 frame->can_id |= CAN_ERR_CRTL; 359 frame->data[1] = CAN_ERR_CRTL_RX_OVERFLOW; 360 stats->rx_over_errors++; 361 stats->rx_errors++; 362 } else { 363 frame->data[1] = 0; 364 } 365 366 old_state = check_set_state(dev, canrflg); 367 /* State changed */ 368 if (old_state != priv->can.state) { 369 switch (priv->can.state) { 370 case CAN_STATE_ERROR_WARNING: 371 frame->can_id |= CAN_ERR_CRTL; 372 priv->can.can_stats.error_warning++; 373 if ((priv->shadow_statflg & MSCAN_RSTAT_MSK) < 374 (canrflg & MSCAN_RSTAT_MSK)) 375 frame->data[1] |= CAN_ERR_CRTL_RX_WARNING; 376 if ((priv->shadow_statflg & MSCAN_TSTAT_MSK) < 377 (canrflg & MSCAN_TSTAT_MSK)) 378 frame->data[1] |= CAN_ERR_CRTL_TX_WARNING; 379 break; 380 case CAN_STATE_ERROR_PASSIVE: 381 frame->can_id |= CAN_ERR_CRTL; 382 priv->can.can_stats.error_passive++; 383 frame->data[1] |= CAN_ERR_CRTL_RX_PASSIVE; 384 break; 385 case CAN_STATE_BUS_OFF: 386 frame->can_id |= CAN_ERR_BUSOFF; 387 /* 388 * The MSCAN on the MPC5200 does recover from bus-off 389 * automatically. To avoid that we stop the chip doing 390 * a light-weight stop (we are in irq-context). 391 */ 392 if (priv->type != MSCAN_TYPE_MPC5121) { 393 out_8(®s->cantier, 0); 394 out_8(®s->canrier, 0); 395 setbits8(®s->canctl0, 396 MSCAN_SLPRQ | MSCAN_INITRQ); 397 } 398 can_bus_off(dev); 399 break; 400 default: 401 break; 402 } 403 } 404 priv->shadow_statflg = canrflg & MSCAN_STAT_MSK; 405 frame->can_dlc = CAN_ERR_DLC; 406 out_8(®s->canrflg, MSCAN_ERR_IF); 407 } 408 409 static int mscan_rx_poll(struct napi_struct *napi, int quota) 410 { 411 struct mscan_priv *priv = container_of(napi, struct mscan_priv, napi); 412 struct net_device *dev = napi->dev; 413 struct mscan_regs __iomem *regs = priv->reg_base; 414 struct net_device_stats *stats = &dev->stats; 415 int npackets = 0; 416 int ret = 1; 417 struct sk_buff *skb; 418 struct can_frame *frame; 419 u8 canrflg; 420 421 while (npackets < quota) { 422 canrflg = in_8(®s->canrflg); 423 if (!(canrflg & (MSCAN_RXF | MSCAN_ERR_IF))) 424 break; 425 426 skb = alloc_can_skb(dev, &frame); 427 if (!skb) { 428 if (printk_ratelimit()) 429 netdev_notice(dev, "packet dropped\n"); 430 stats->rx_dropped++; 431 out_8(®s->canrflg, canrflg); 432 continue; 433 } 434 435 if (canrflg & MSCAN_RXF) 436 mscan_get_rx_frame(dev, frame); 437 else if (canrflg & MSCAN_ERR_IF) 438 mscan_get_err_frame(dev, frame, canrflg); 439 440 stats->rx_packets++; 441 stats->rx_bytes += frame->can_dlc; 442 npackets++; 443 netif_receive_skb(skb); 444 } 445 446 if (!(in_8(®s->canrflg) & (MSCAN_RXF | MSCAN_ERR_IF))) { 447 napi_complete(&priv->napi); 448 clear_bit(F_RX_PROGRESS, &priv->flags); 449 if (priv->can.state < CAN_STATE_BUS_OFF) 450 out_8(®s->canrier, priv->shadow_canrier); 451 ret = 0; 452 } 453 return ret; 454 } 455 456 static irqreturn_t mscan_isr(int irq, void *dev_id) 457 { 458 struct net_device *dev = (struct net_device *)dev_id; 459 struct mscan_priv *priv = netdev_priv(dev); 460 struct mscan_regs __iomem *regs = priv->reg_base; 461 struct net_device_stats *stats = &dev->stats; 462 u8 cantier, cantflg, canrflg; 463 irqreturn_t ret = IRQ_NONE; 464 465 cantier = in_8(®s->cantier) & MSCAN_TXE; 466 cantflg = in_8(®s->cantflg) & cantier; 467 468 if (cantier && cantflg) { 469 struct list_head *tmp, *pos; 470 471 list_for_each_safe(pos, tmp, &priv->tx_head) { 472 struct tx_queue_entry *entry = 473 list_entry(pos, struct tx_queue_entry, list); 474 u8 mask = entry->mask; 475 476 if (!(cantflg & mask)) 477 continue; 478 479 out_8(®s->cantbsel, mask); 480 stats->tx_bytes += in_8(®s->tx.dlr); 481 stats->tx_packets++; 482 can_get_echo_skb(dev, entry->id); 483 priv->tx_active &= ~mask; 484 list_del(pos); 485 } 486 487 if (list_empty(&priv->tx_head)) { 488 clear_bit(F_TX_WAIT_ALL, &priv->flags); 489 clear_bit(F_TX_PROGRESS, &priv->flags); 490 priv->cur_pri = 0; 491 } else { 492 dev->trans_start = jiffies; 493 } 494 495 if (!test_bit(F_TX_WAIT_ALL, &priv->flags)) 496 netif_wake_queue(dev); 497 498 out_8(®s->cantier, priv->tx_active); 499 ret = IRQ_HANDLED; 500 } 501 502 canrflg = in_8(®s->canrflg); 503 if ((canrflg & ~MSCAN_STAT_MSK) && 504 !test_and_set_bit(F_RX_PROGRESS, &priv->flags)) { 505 if (canrflg & ~MSCAN_STAT_MSK) { 506 priv->shadow_canrier = in_8(®s->canrier); 507 out_8(®s->canrier, 0); 508 napi_schedule(&priv->napi); 509 ret = IRQ_HANDLED; 510 } else { 511 clear_bit(F_RX_PROGRESS, &priv->flags); 512 } 513 } 514 return ret; 515 } 516 517 static int mscan_do_set_mode(struct net_device *dev, enum can_mode mode) 518 { 519 int ret = 0; 520 521 switch (mode) { 522 case CAN_MODE_START: 523 ret = mscan_restart(dev); 524 if (ret) 525 break; 526 if (netif_queue_stopped(dev)) 527 netif_wake_queue(dev); 528 break; 529 530 default: 531 ret = -EOPNOTSUPP; 532 break; 533 } 534 return ret; 535 } 536 537 static int mscan_do_set_bittiming(struct net_device *dev) 538 { 539 struct mscan_priv *priv = netdev_priv(dev); 540 struct mscan_regs __iomem *regs = priv->reg_base; 541 struct can_bittiming *bt = &priv->can.bittiming; 542 u8 btr0, btr1; 543 544 btr0 = BTR0_SET_BRP(bt->brp) | BTR0_SET_SJW(bt->sjw); 545 btr1 = (BTR1_SET_TSEG1(bt->prop_seg + bt->phase_seg1) | 546 BTR1_SET_TSEG2(bt->phase_seg2) | 547 BTR1_SET_SAM(priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)); 548 549 netdev_info(dev, "setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1); 550 551 out_8(®s->canbtr0, btr0); 552 out_8(®s->canbtr1, btr1); 553 554 return 0; 555 } 556 557 static int mscan_get_berr_counter(const struct net_device *dev, 558 struct can_berr_counter *bec) 559 { 560 struct mscan_priv *priv = netdev_priv(dev); 561 struct mscan_regs __iomem *regs = priv->reg_base; 562 563 bec->txerr = in_8(®s->cantxerr); 564 bec->rxerr = in_8(®s->canrxerr); 565 566 return 0; 567 } 568 569 static int mscan_open(struct net_device *dev) 570 { 571 int ret; 572 struct mscan_priv *priv = netdev_priv(dev); 573 struct mscan_regs __iomem *regs = priv->reg_base; 574 575 if (priv->clk_ipg) { 576 ret = clk_prepare_enable(priv->clk_ipg); 577 if (ret) 578 goto exit_retcode; 579 } 580 if (priv->clk_can) { 581 ret = clk_prepare_enable(priv->clk_can); 582 if (ret) 583 goto exit_dis_ipg_clock; 584 } 585 586 /* common open */ 587 ret = open_candev(dev); 588 if (ret) 589 goto exit_dis_can_clock; 590 591 napi_enable(&priv->napi); 592 593 ret = request_irq(dev->irq, mscan_isr, 0, dev->name, dev); 594 if (ret < 0) { 595 netdev_err(dev, "failed to attach interrupt\n"); 596 goto exit_napi_disable; 597 } 598 599 if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY) 600 setbits8(®s->canctl1, MSCAN_LISTEN); 601 else 602 clrbits8(®s->canctl1, MSCAN_LISTEN); 603 604 ret = mscan_start(dev); 605 if (ret) 606 goto exit_free_irq; 607 608 netif_start_queue(dev); 609 610 return 0; 611 612 exit_free_irq: 613 free_irq(dev->irq, dev); 614 exit_napi_disable: 615 napi_disable(&priv->napi); 616 close_candev(dev); 617 exit_dis_can_clock: 618 if (priv->clk_can) 619 clk_disable_unprepare(priv->clk_can); 620 exit_dis_ipg_clock: 621 if (priv->clk_ipg) 622 clk_disable_unprepare(priv->clk_ipg); 623 exit_retcode: 624 return ret; 625 } 626 627 static int mscan_close(struct net_device *dev) 628 { 629 struct mscan_priv *priv = netdev_priv(dev); 630 struct mscan_regs __iomem *regs = priv->reg_base; 631 632 netif_stop_queue(dev); 633 napi_disable(&priv->napi); 634 635 out_8(®s->cantier, 0); 636 out_8(®s->canrier, 0); 637 mscan_set_mode(dev, MSCAN_INIT_MODE); 638 close_candev(dev); 639 free_irq(dev->irq, dev); 640 641 if (priv->clk_can) 642 clk_disable_unprepare(priv->clk_can); 643 if (priv->clk_ipg) 644 clk_disable_unprepare(priv->clk_ipg); 645 646 return 0; 647 } 648 649 static const struct net_device_ops mscan_netdev_ops = { 650 .ndo_open = mscan_open, 651 .ndo_stop = mscan_close, 652 .ndo_start_xmit = mscan_start_xmit, 653 .ndo_change_mtu = can_change_mtu, 654 }; 655 656 int register_mscandev(struct net_device *dev, int mscan_clksrc) 657 { 658 struct mscan_priv *priv = netdev_priv(dev); 659 struct mscan_regs __iomem *regs = priv->reg_base; 660 u8 ctl1; 661 662 ctl1 = in_8(®s->canctl1); 663 if (mscan_clksrc) 664 ctl1 |= MSCAN_CLKSRC; 665 else 666 ctl1 &= ~MSCAN_CLKSRC; 667 668 if (priv->type == MSCAN_TYPE_MPC5121) { 669 priv->can.do_get_berr_counter = mscan_get_berr_counter; 670 ctl1 |= MSCAN_BORM; /* bus-off recovery upon request */ 671 } 672 673 ctl1 |= MSCAN_CANE; 674 out_8(®s->canctl1, ctl1); 675 udelay(100); 676 677 /* acceptance mask/acceptance code (accept everything) */ 678 out_be16(®s->canidar1_0, 0); 679 out_be16(®s->canidar3_2, 0); 680 out_be16(®s->canidar5_4, 0); 681 out_be16(®s->canidar7_6, 0); 682 683 out_be16(®s->canidmr1_0, 0xffff); 684 out_be16(®s->canidmr3_2, 0xffff); 685 out_be16(®s->canidmr5_4, 0xffff); 686 out_be16(®s->canidmr7_6, 0xffff); 687 /* Two 32 bit Acceptance Filters */ 688 out_8(®s->canidac, MSCAN_AF_32BIT); 689 690 mscan_set_mode(dev, MSCAN_INIT_MODE); 691 692 return register_candev(dev); 693 } 694 695 void unregister_mscandev(struct net_device *dev) 696 { 697 struct mscan_priv *priv = netdev_priv(dev); 698 struct mscan_regs __iomem *regs = priv->reg_base; 699 mscan_set_mode(dev, MSCAN_INIT_MODE); 700 clrbits8(®s->canctl1, MSCAN_CANE); 701 unregister_candev(dev); 702 } 703 704 struct net_device *alloc_mscandev(void) 705 { 706 struct net_device *dev; 707 struct mscan_priv *priv; 708 int i; 709 710 dev = alloc_candev(sizeof(struct mscan_priv), MSCAN_ECHO_SKB_MAX); 711 if (!dev) 712 return NULL; 713 priv = netdev_priv(dev); 714 715 dev->netdev_ops = &mscan_netdev_ops; 716 717 dev->flags |= IFF_ECHO; /* we support local echo */ 718 719 netif_napi_add(dev, &priv->napi, mscan_rx_poll, 8); 720 721 priv->can.bittiming_const = &mscan_bittiming_const; 722 priv->can.do_set_bittiming = mscan_do_set_bittiming; 723 priv->can.do_set_mode = mscan_do_set_mode; 724 priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES | 725 CAN_CTRLMODE_LISTENONLY; 726 727 for (i = 0; i < TX_QUEUE_SIZE; i++) { 728 priv->tx_queue[i].id = i; 729 priv->tx_queue[i].mask = 1 << i; 730 } 731 732 return dev; 733 } 734 735 MODULE_AUTHOR("Andrey Volkov <avolkov@varma-el.com>"); 736 MODULE_LICENSE("GPL v2"); 737 MODULE_DESCRIPTION("CAN port driver for a MSCAN based chips"); 738