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 36static 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 48struct mscan_state { 49 u8 mode; 50 u8 canrier; 51 u8 cantier; 52}; 53 54static 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 61static 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 137static 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 175static 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 197static 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 292static enum can_state get_new_state(struct net_device *dev, u8 canrflg) 293{ 294 struct mscan_priv *priv = netdev_priv(dev); 295 296 if (unlikely(canrflg & MSCAN_CSCIF)) 297 return state_map[max(MSCAN_STATE_RX(canrflg), 298 MSCAN_STATE_TX(canrflg))]; 299 300 return priv->can.state; 301} 302 303static void mscan_get_rx_frame(struct net_device *dev, struct can_frame *frame) 304{ 305 struct mscan_priv *priv = netdev_priv(dev); 306 struct mscan_regs __iomem *regs = priv->reg_base; 307 u32 can_id; 308 int i; 309 310 can_id = in_be16(®s->rx.idr1_0); 311 if (can_id & (1 << 3)) { 312 frame->can_id = CAN_EFF_FLAG; 313 can_id = ((can_id << 16) | in_be16(®s->rx.idr3_2)); 314 can_id = ((can_id & 0xffe00000) | 315 ((can_id & 0x7ffff) << 2)) >> 2; 316 } else { 317 can_id >>= 4; 318 frame->can_id = 0; 319 } 320 321 frame->can_id |= can_id >> 1; 322 if (can_id & 1) 323 frame->can_id |= CAN_RTR_FLAG; 324 325 frame->can_dlc = get_can_dlc(in_8(®s->rx.dlr) & 0xf); 326 327 if (!(frame->can_id & CAN_RTR_FLAG)) { 328 void __iomem *data = ®s->rx.dsr1_0; 329 u16 *payload = (u16 *)frame->data; 330 331 for (i = 0; i < frame->can_dlc / 2; i++) { 332 *payload++ = in_be16(data); 333 data += 2 + _MSCAN_RESERVED_DSR_SIZE; 334 } 335 /* read remaining byte if necessary */ 336 if (frame->can_dlc & 1) 337 frame->data[frame->can_dlc - 1] = in_8(data); 338 } 339 340 out_8(®s->canrflg, MSCAN_RXF); 341} 342 343static void mscan_get_err_frame(struct net_device *dev, struct can_frame *frame, 344 u8 canrflg) 345{ 346 struct mscan_priv *priv = netdev_priv(dev); 347 struct mscan_regs __iomem *regs = priv->reg_base; 348 struct net_device_stats *stats = &dev->stats; 349 enum can_state new_state; 350 351 netdev_dbg(dev, "error interrupt (canrflg=%#x)\n", canrflg); 352 frame->can_id = CAN_ERR_FLAG; 353 354 if (canrflg & MSCAN_OVRIF) { 355 frame->can_id |= CAN_ERR_CRTL; 356 frame->data[1] = CAN_ERR_CRTL_RX_OVERFLOW; 357 stats->rx_over_errors++; 358 stats->rx_errors++; 359 } else { 360 frame->data[1] = 0; 361 } 362 363 new_state = get_new_state(dev, canrflg); 364 if (new_state != priv->can.state) { 365 can_change_state(dev, frame, 366 state_map[MSCAN_STATE_TX(canrflg)], 367 state_map[MSCAN_STATE_RX(canrflg)]); 368 369 if (priv->can.state == CAN_STATE_BUS_OFF) { 370 /* 371 * The MSCAN on the MPC5200 does recover from bus-off 372 * automatically. To avoid that we stop the chip doing 373 * a light-weight stop (we are in irq-context). 374 */ 375 if (priv->type != MSCAN_TYPE_MPC5121) { 376 out_8(®s->cantier, 0); 377 out_8(®s->canrier, 0); 378 setbits8(®s->canctl0, 379 MSCAN_SLPRQ | MSCAN_INITRQ); 380 } 381 can_bus_off(dev); 382 } 383 } 384 priv->shadow_statflg = canrflg & MSCAN_STAT_MSK; 385 frame->can_dlc = CAN_ERR_DLC; 386 out_8(®s->canrflg, MSCAN_ERR_IF); 387} 388 389static int mscan_rx_poll(struct napi_struct *napi, int quota) 390{ 391 struct mscan_priv *priv = container_of(napi, struct mscan_priv, napi); 392 struct net_device *dev = napi->dev; 393 struct mscan_regs __iomem *regs = priv->reg_base; 394 struct net_device_stats *stats = &dev->stats; 395 int npackets = 0; 396 int ret = 1; 397 struct sk_buff *skb; 398 struct can_frame *frame; 399 u8 canrflg; 400 401 while (npackets < quota) { 402 canrflg = in_8(®s->canrflg); 403 if (!(canrflg & (MSCAN_RXF | MSCAN_ERR_IF))) 404 break; 405 406 skb = alloc_can_skb(dev, &frame); 407 if (!skb) { 408 if (printk_ratelimit()) 409 netdev_notice(dev, "packet dropped\n"); 410 stats->rx_dropped++; 411 out_8(®s->canrflg, canrflg); 412 continue; 413 } 414 415 if (canrflg & MSCAN_RXF) 416 mscan_get_rx_frame(dev, frame); 417 else if (canrflg & MSCAN_ERR_IF) 418 mscan_get_err_frame(dev, frame, canrflg); 419 420 stats->rx_packets++; 421 stats->rx_bytes += frame->can_dlc; 422 npackets++; 423 netif_receive_skb(skb); 424 } 425 426 if (!(in_8(®s->canrflg) & (MSCAN_RXF | MSCAN_ERR_IF))) { 427 napi_complete(&priv->napi); 428 clear_bit(F_RX_PROGRESS, &priv->flags); 429 if (priv->can.state < CAN_STATE_BUS_OFF) 430 out_8(®s->canrier, priv->shadow_canrier); 431 ret = 0; 432 } 433 return ret; 434} 435 436static irqreturn_t mscan_isr(int irq, void *dev_id) 437{ 438 struct net_device *dev = (struct net_device *)dev_id; 439 struct mscan_priv *priv = netdev_priv(dev); 440 struct mscan_regs __iomem *regs = priv->reg_base; 441 struct net_device_stats *stats = &dev->stats; 442 u8 cantier, cantflg, canrflg; 443 irqreturn_t ret = IRQ_NONE; 444 445 cantier = in_8(®s->cantier) & MSCAN_TXE; 446 cantflg = in_8(®s->cantflg) & cantier; 447 448 if (cantier && cantflg) { 449 struct list_head *tmp, *pos; 450 451 list_for_each_safe(pos, tmp, &priv->tx_head) { 452 struct tx_queue_entry *entry = 453 list_entry(pos, struct tx_queue_entry, list); 454 u8 mask = entry->mask; 455 456 if (!(cantflg & mask)) 457 continue; 458 459 out_8(®s->cantbsel, mask); 460 stats->tx_bytes += in_8(®s->tx.dlr); 461 stats->tx_packets++; 462 can_get_echo_skb(dev, entry->id); 463 priv->tx_active &= ~mask; 464 list_del(pos); 465 } 466 467 if (list_empty(&priv->tx_head)) { 468 clear_bit(F_TX_WAIT_ALL, &priv->flags); 469 clear_bit(F_TX_PROGRESS, &priv->flags); 470 priv->cur_pri = 0; 471 } else { 472 dev->trans_start = jiffies; 473 } 474 475 if (!test_bit(F_TX_WAIT_ALL, &priv->flags)) 476 netif_wake_queue(dev); 477 478 out_8(®s->cantier, priv->tx_active); 479 ret = IRQ_HANDLED; 480 } 481 482 canrflg = in_8(®s->canrflg); 483 if ((canrflg & ~MSCAN_STAT_MSK) && 484 !test_and_set_bit(F_RX_PROGRESS, &priv->flags)) { 485 if (canrflg & ~MSCAN_STAT_MSK) { 486 priv->shadow_canrier = in_8(®s->canrier); 487 out_8(®s->canrier, 0); 488 napi_schedule(&priv->napi); 489 ret = IRQ_HANDLED; 490 } else { 491 clear_bit(F_RX_PROGRESS, &priv->flags); 492 } 493 } 494 return ret; 495} 496 497static int mscan_do_set_mode(struct net_device *dev, enum can_mode mode) 498{ 499 int ret = 0; 500 501 switch (mode) { 502 case CAN_MODE_START: 503 ret = mscan_restart(dev); 504 if (ret) 505 break; 506 if (netif_queue_stopped(dev)) 507 netif_wake_queue(dev); 508 break; 509 510 default: 511 ret = -EOPNOTSUPP; 512 break; 513 } 514 return ret; 515} 516 517static int mscan_do_set_bittiming(struct net_device *dev) 518{ 519 struct mscan_priv *priv = netdev_priv(dev); 520 struct mscan_regs __iomem *regs = priv->reg_base; 521 struct can_bittiming *bt = &priv->can.bittiming; 522 u8 btr0, btr1; 523 524 btr0 = BTR0_SET_BRP(bt->brp) | BTR0_SET_SJW(bt->sjw); 525 btr1 = (BTR1_SET_TSEG1(bt->prop_seg + bt->phase_seg1) | 526 BTR1_SET_TSEG2(bt->phase_seg2) | 527 BTR1_SET_SAM(priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)); 528 529 netdev_info(dev, "setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1); 530 531 out_8(®s->canbtr0, btr0); 532 out_8(®s->canbtr1, btr1); 533 534 return 0; 535} 536 537static int mscan_get_berr_counter(const struct net_device *dev, 538 struct can_berr_counter *bec) 539{ 540 struct mscan_priv *priv = netdev_priv(dev); 541 struct mscan_regs __iomem *regs = priv->reg_base; 542 543 bec->txerr = in_8(®s->cantxerr); 544 bec->rxerr = in_8(®s->canrxerr); 545 546 return 0; 547} 548 549static int mscan_open(struct net_device *dev) 550{ 551 int ret; 552 struct mscan_priv *priv = netdev_priv(dev); 553 struct mscan_regs __iomem *regs = priv->reg_base; 554 555 if (priv->clk_ipg) { 556 ret = clk_prepare_enable(priv->clk_ipg); 557 if (ret) 558 goto exit_retcode; 559 } 560 if (priv->clk_can) { 561 ret = clk_prepare_enable(priv->clk_can); 562 if (ret) 563 goto exit_dis_ipg_clock; 564 } 565 566 /* common open */ 567 ret = open_candev(dev); 568 if (ret) 569 goto exit_dis_can_clock; 570 571 napi_enable(&priv->napi); 572 573 ret = request_irq(dev->irq, mscan_isr, 0, dev->name, dev); 574 if (ret < 0) { 575 netdev_err(dev, "failed to attach interrupt\n"); 576 goto exit_napi_disable; 577 } 578 579 if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY) 580 setbits8(®s->canctl1, MSCAN_LISTEN); 581 else 582 clrbits8(®s->canctl1, MSCAN_LISTEN); 583 584 ret = mscan_start(dev); 585 if (ret) 586 goto exit_free_irq; 587 588 netif_start_queue(dev); 589 590 return 0; 591 592exit_free_irq: 593 free_irq(dev->irq, dev); 594exit_napi_disable: 595 napi_disable(&priv->napi); 596 close_candev(dev); 597exit_dis_can_clock: 598 if (priv->clk_can) 599 clk_disable_unprepare(priv->clk_can); 600exit_dis_ipg_clock: 601 if (priv->clk_ipg) 602 clk_disable_unprepare(priv->clk_ipg); 603exit_retcode: 604 return ret; 605} 606 607static int mscan_close(struct net_device *dev) 608{ 609 struct mscan_priv *priv = netdev_priv(dev); 610 struct mscan_regs __iomem *regs = priv->reg_base; 611 612 netif_stop_queue(dev); 613 napi_disable(&priv->napi); 614 615 out_8(®s->cantier, 0); 616 out_8(®s->canrier, 0); 617 mscan_set_mode(dev, MSCAN_INIT_MODE); 618 close_candev(dev); 619 free_irq(dev->irq, dev); 620 621 if (priv->clk_can) 622 clk_disable_unprepare(priv->clk_can); 623 if (priv->clk_ipg) 624 clk_disable_unprepare(priv->clk_ipg); 625 626 return 0; 627} 628 629static const struct net_device_ops mscan_netdev_ops = { 630 .ndo_open = mscan_open, 631 .ndo_stop = mscan_close, 632 .ndo_start_xmit = mscan_start_xmit, 633 .ndo_change_mtu = can_change_mtu, 634}; 635 636int register_mscandev(struct net_device *dev, int mscan_clksrc) 637{ 638 struct mscan_priv *priv = netdev_priv(dev); 639 struct mscan_regs __iomem *regs = priv->reg_base; 640 u8 ctl1; 641 642 ctl1 = in_8(®s->canctl1); 643 if (mscan_clksrc) 644 ctl1 |= MSCAN_CLKSRC; 645 else 646 ctl1 &= ~MSCAN_CLKSRC; 647 648 if (priv->type == MSCAN_TYPE_MPC5121) { 649 priv->can.do_get_berr_counter = mscan_get_berr_counter; 650 ctl1 |= MSCAN_BORM; /* bus-off recovery upon request */ 651 } 652 653 ctl1 |= MSCAN_CANE; 654 out_8(®s->canctl1, ctl1); 655 udelay(100); 656 657 /* acceptance mask/acceptance code (accept everything) */ 658 out_be16(®s->canidar1_0, 0); 659 out_be16(®s->canidar3_2, 0); 660 out_be16(®s->canidar5_4, 0); 661 out_be16(®s->canidar7_6, 0); 662 663 out_be16(®s->canidmr1_0, 0xffff); 664 out_be16(®s->canidmr3_2, 0xffff); 665 out_be16(®s->canidmr5_4, 0xffff); 666 out_be16(®s->canidmr7_6, 0xffff); 667 /* Two 32 bit Acceptance Filters */ 668 out_8(®s->canidac, MSCAN_AF_32BIT); 669 670 mscan_set_mode(dev, MSCAN_INIT_MODE); 671 672 return register_candev(dev); 673} 674 675void unregister_mscandev(struct net_device *dev) 676{ 677 struct mscan_priv *priv = netdev_priv(dev); 678 struct mscan_regs __iomem *regs = priv->reg_base; 679 mscan_set_mode(dev, MSCAN_INIT_MODE); 680 clrbits8(®s->canctl1, MSCAN_CANE); 681 unregister_candev(dev); 682} 683 684struct net_device *alloc_mscandev(void) 685{ 686 struct net_device *dev; 687 struct mscan_priv *priv; 688 int i; 689 690 dev = alloc_candev(sizeof(struct mscan_priv), MSCAN_ECHO_SKB_MAX); 691 if (!dev) 692 return NULL; 693 priv = netdev_priv(dev); 694 695 dev->netdev_ops = &mscan_netdev_ops; 696 697 dev->flags |= IFF_ECHO; /* we support local echo */ 698 699 netif_napi_add(dev, &priv->napi, mscan_rx_poll, 8); 700 701 priv->can.bittiming_const = &mscan_bittiming_const; 702 priv->can.do_set_bittiming = mscan_do_set_bittiming; 703 priv->can.do_set_mode = mscan_do_set_mode; 704 priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES | 705 CAN_CTRLMODE_LISTENONLY; 706 707 for (i = 0; i < TX_QUEUE_SIZE; i++) { 708 priv->tx_queue[i].id = i; 709 priv->tx_queue[i].mask = 1 << i; 710 } 711 712 return dev; 713} 714 715MODULE_AUTHOR("Andrey Volkov <avolkov@varma-el.com>"); 716MODULE_LICENSE("GPL v2"); 717MODULE_DESCRIPTION("CAN port driver for a MSCAN based chips"); 718