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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Core driver for the CC770 and AN82527 CAN controllers4 *5 * Copyright (C) 2009, 2011 Wolfgang Grandegger <wg@grandegger.com>6 */7 8#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt9 10#include <linux/module.h>11#include <linux/init.h>12#include <linux/kernel.h>13#include <linux/sched.h>14#include <linux/types.h>15#include <linux/fcntl.h>16#include <linux/interrupt.h>17#include <linux/ptrace.h>18#include <linux/string.h>19#include <linux/errno.h>20#include <linux/ethtool.h>21#include <linux/netdevice.h>22#include <linux/if_arp.h>23#include <linux/if_ether.h>24#include <linux/skbuff.h>25#include <linux/delay.h>26 27#include <linux/can.h>28#include <linux/can/dev.h>29#include <linux/can/error.h>30#include <linux/can/platform/cc770.h>31 32#include "cc770.h"33 34MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");35MODULE_LICENSE("GPL v2");36MODULE_DESCRIPTION(KBUILD_MODNAME "CAN netdevice driver");37 38/*39 * The CC770 is a CAN controller from Bosch, which is 100% compatible40 * with the AN82527 from Intel, but with "bugs" being fixed and some41 * additional functionality, mainly:42 *43 * 1. RX and TX error counters are readable.44 * 2. Support of silent (listen-only) mode.45 * 3. Message object 15 can receive all types of frames, also RTR and EFF.46 *47 * Details are available from Bosch's "CC770_Product_Info_2007-01.pdf",48 * which explains in detail the compatibility between the CC770 and the49 * 82527. This driver use the additional functionality 3. on real CC77050 * devices. Unfortunately, the CC770 does still not store the message51 * identifier of received remote transmission request frames and52 * therefore it's set to 0.53 *54 * The message objects 1..14 can be used for TX and RX while the message55 * objects 15 is optimized for RX. It has a shadow register for reliable56 * data reception under heavy bus load. Therefore it makes sense to use57 * this message object for the needed use case. The frame type (EFF/SFF)58 * for the message object 15 can be defined via kernel module parameter59 * "msgobj15_eff". If not equal 0, it will receive 29-bit EFF frames,60 * otherwise 11 bit SFF messages.61 */62static int msgobj15_eff;63module_param(msgobj15_eff, int, 0444);64MODULE_PARM_DESC(msgobj15_eff, "Extended 29-bit frames for message object 15 "65 "(default: 11-bit standard frames)");66 67static int i82527_compat;68module_param(i82527_compat, int, 0444);69MODULE_PARM_DESC(i82527_compat, "Strict Intel 82527 compatibility mode "70 "without using additional functions");71 72/*73 * This driver uses the last 5 message objects 11..15. The definitions74 * and structure below allows to configure and assign them to the real75 * message object.76 */77static unsigned char cc770_obj_flags[CC770_OBJ_MAX] = {78 [CC770_OBJ_RX0] = CC770_OBJ_FLAG_RX,79 [CC770_OBJ_RX1] = CC770_OBJ_FLAG_RX | CC770_OBJ_FLAG_EFF,80 [CC770_OBJ_RX_RTR0] = CC770_OBJ_FLAG_RX | CC770_OBJ_FLAG_RTR,81 [CC770_OBJ_RX_RTR1] = CC770_OBJ_FLAG_RX | CC770_OBJ_FLAG_RTR |82 CC770_OBJ_FLAG_EFF,83 [CC770_OBJ_TX] = 0,84};85 86static const struct can_bittiming_const cc770_bittiming_const = {87 .name = KBUILD_MODNAME,88 .tseg1_min = 1,89 .tseg1_max = 16,90 .tseg2_min = 1,91 .tseg2_max = 8,92 .sjw_max = 4,93 .brp_min = 1,94 .brp_max = 64,95 .brp_inc = 1,96};97 98static inline int intid2obj(unsigned int intid)99{100 if (intid == 2)101 return 0;102 else103 return MSGOBJ_LAST + 2 - intid;104}105 106static void enable_all_objs(const struct net_device *dev)107{108 struct cc770_priv *priv = netdev_priv(dev);109 u8 msgcfg;110 unsigned char obj_flags;111 unsigned int o, mo;112 113 for (o = 0; o < ARRAY_SIZE(priv->obj_flags); o++) {114 obj_flags = priv->obj_flags[o];115 mo = obj2msgobj(o);116 117 if (obj_flags & CC770_OBJ_FLAG_RX) {118 /*119 * We don't need extra objects for RTR and EFF if120 * the additional CC770 functions are enabled.121 */122 if (priv->control_normal_mode & CTRL_EAF) {123 if (o > 0)124 continue;125 netdev_dbg(dev, "Message object %d for "126 "RX data, RTR, SFF and EFF\n", mo);127 } else {128 netdev_dbg(dev,129 "Message object %d for RX %s %s\n",130 mo, obj_flags & CC770_OBJ_FLAG_RTR ?131 "RTR" : "data",132 obj_flags & CC770_OBJ_FLAG_EFF ?133 "EFF" : "SFF");134 }135 136 if (obj_flags & CC770_OBJ_FLAG_EFF)137 msgcfg = MSGCFG_XTD;138 else139 msgcfg = 0;140 if (obj_flags & CC770_OBJ_FLAG_RTR)141 msgcfg |= MSGCFG_DIR;142 143 cc770_write_reg(priv, msgobj[mo].config, msgcfg);144 cc770_write_reg(priv, msgobj[mo].ctrl0,145 MSGVAL_SET | TXIE_RES |146 RXIE_SET | INTPND_RES);147 148 if (obj_flags & CC770_OBJ_FLAG_RTR)149 cc770_write_reg(priv, msgobj[mo].ctrl1,150 NEWDAT_RES | CPUUPD_SET |151 TXRQST_RES | RMTPND_RES);152 else153 cc770_write_reg(priv, msgobj[mo].ctrl1,154 NEWDAT_RES | MSGLST_RES |155 TXRQST_RES | RMTPND_RES);156 } else {157 netdev_dbg(dev, "Message object %d for "158 "TX data, RTR, SFF and EFF\n", mo);159 160 cc770_write_reg(priv, msgobj[mo].ctrl1,161 RMTPND_RES | TXRQST_RES |162 CPUUPD_RES | NEWDAT_RES);163 cc770_write_reg(priv, msgobj[mo].ctrl0,164 MSGVAL_RES | TXIE_RES |165 RXIE_RES | INTPND_RES);166 }167 }168}169 170static void disable_all_objs(const struct cc770_priv *priv)171{172 int o, mo;173 174 for (o = 0; o < ARRAY_SIZE(priv->obj_flags); o++) {175 mo = obj2msgobj(o);176 177 if (priv->obj_flags[o] & CC770_OBJ_FLAG_RX) {178 if (o > 0 && priv->control_normal_mode & CTRL_EAF)179 continue;180 181 cc770_write_reg(priv, msgobj[mo].ctrl1,182 NEWDAT_RES | MSGLST_RES |183 TXRQST_RES | RMTPND_RES);184 cc770_write_reg(priv, msgobj[mo].ctrl0,185 MSGVAL_RES | TXIE_RES |186 RXIE_RES | INTPND_RES);187 } else {188 /* Clear message object for send */189 cc770_write_reg(priv, msgobj[mo].ctrl1,190 RMTPND_RES | TXRQST_RES |191 CPUUPD_RES | NEWDAT_RES);192 cc770_write_reg(priv, msgobj[mo].ctrl0,193 MSGVAL_RES | TXIE_RES |194 RXIE_RES | INTPND_RES);195 }196 }197}198 199static void set_reset_mode(struct net_device *dev)200{201 struct cc770_priv *priv = netdev_priv(dev);202 203 /* Enable configuration and puts chip in bus-off, disable interrupts */204 cc770_write_reg(priv, control, CTRL_CCE | CTRL_INI);205 206 priv->can.state = CAN_STATE_STOPPED;207 208 /* Clear interrupts */209 cc770_read_reg(priv, interrupt);210 211 /* Clear status register */212 cc770_write_reg(priv, status, 0);213 214 /* Disable all used message objects */215 disable_all_objs(priv);216}217 218static void set_normal_mode(struct net_device *dev)219{220 struct cc770_priv *priv = netdev_priv(dev);221 222 /* Clear interrupts */223 cc770_read_reg(priv, interrupt);224 225 /* Clear status register and pre-set last error code */226 cc770_write_reg(priv, status, STAT_LEC_MASK);227 228 /* Enable all used message objects*/229 enable_all_objs(dev);230 231 /*232 * Clear bus-off, interrupts only for errors,233 * not for status change234 */235 cc770_write_reg(priv, control, priv->control_normal_mode);236 237 priv->can.state = CAN_STATE_ERROR_ACTIVE;238}239 240static void chipset_init(struct cc770_priv *priv)241{242 int mo, id, data;243 244 /* Enable configuration and put chip in bus-off, disable interrupts */245 cc770_write_reg(priv, control, (CTRL_CCE | CTRL_INI));246 247 /* Set CLKOUT divider and slew rates */248 cc770_write_reg(priv, clkout, priv->clkout);249 250 /* Configure CPU interface / CLKOUT enable */251 cc770_write_reg(priv, cpu_interface, priv->cpu_interface);252 253 /* Set bus configuration */254 cc770_write_reg(priv, bus_config, priv->bus_config);255 256 /* Clear interrupts */257 cc770_read_reg(priv, interrupt);258 259 /* Clear status register */260 cc770_write_reg(priv, status, 0);261 262 /* Clear and invalidate message objects */263 for (mo = MSGOBJ_FIRST; mo <= MSGOBJ_LAST; mo++) {264 cc770_write_reg(priv, msgobj[mo].ctrl0,265 INTPND_UNC | RXIE_RES |266 TXIE_RES | MSGVAL_RES);267 cc770_write_reg(priv, msgobj[mo].ctrl0,268 INTPND_RES | RXIE_RES |269 TXIE_RES | MSGVAL_RES);270 cc770_write_reg(priv, msgobj[mo].ctrl1,271 NEWDAT_RES | MSGLST_RES |272 TXRQST_RES | RMTPND_RES);273 for (data = 0; data < 8; data++)274 cc770_write_reg(priv, msgobj[mo].data[data], 0);275 for (id = 0; id < 4; id++)276 cc770_write_reg(priv, msgobj[mo].id[id], 0);277 cc770_write_reg(priv, msgobj[mo].config, 0);278 }279 280 /* Set all global ID masks to "don't care" */281 cc770_write_reg(priv, global_mask_std[0], 0);282 cc770_write_reg(priv, global_mask_std[1], 0);283 cc770_write_reg(priv, global_mask_ext[0], 0);284 cc770_write_reg(priv, global_mask_ext[1], 0);285 cc770_write_reg(priv, global_mask_ext[2], 0);286 cc770_write_reg(priv, global_mask_ext[3], 0);287 288}289 290static int cc770_probe_chip(struct net_device *dev)291{292 struct cc770_priv *priv = netdev_priv(dev);293 294 /* Enable configuration, put chip in bus-off, disable ints */295 cc770_write_reg(priv, control, CTRL_CCE | CTRL_EAF | CTRL_INI);296 /* Configure cpu interface / CLKOUT disable */297 cc770_write_reg(priv, cpu_interface, priv->cpu_interface);298 299 /*300 * Check if hardware reset is still inactive or maybe there301 * is no chip in this address space302 */303 if (cc770_read_reg(priv, cpu_interface) & CPUIF_RST) {304 netdev_info(dev, "probing @0x%p failed (reset)\n",305 priv->reg_base);306 return -ENODEV;307 }308 309 /* Write and read back test pattern (some arbitrary values) */310 cc770_write_reg(priv, msgobj[1].data[1], 0x25);311 cc770_write_reg(priv, msgobj[2].data[3], 0x52);312 cc770_write_reg(priv, msgobj[10].data[6], 0xc3);313 if ((cc770_read_reg(priv, msgobj[1].data[1]) != 0x25) ||314 (cc770_read_reg(priv, msgobj[2].data[3]) != 0x52) ||315 (cc770_read_reg(priv, msgobj[10].data[6]) != 0xc3)) {316 netdev_info(dev, "probing @0x%p failed (pattern)\n",317 priv->reg_base);318 return -ENODEV;319 }320 321 /* Check if this chip is a CC770 supporting additional functions */322 if (cc770_read_reg(priv, control) & CTRL_EAF)323 priv->control_normal_mode |= CTRL_EAF;324 325 return 0;326}327 328static void cc770_start(struct net_device *dev)329{330 struct cc770_priv *priv = netdev_priv(dev);331 332 /* leave reset mode */333 if (priv->can.state != CAN_STATE_STOPPED)334 set_reset_mode(dev);335 336 /* leave reset mode */337 set_normal_mode(dev);338}339 340static int cc770_set_mode(struct net_device *dev, enum can_mode mode)341{342 switch (mode) {343 case CAN_MODE_START:344 cc770_start(dev);345 netif_wake_queue(dev);346 break;347 348 default:349 return -EOPNOTSUPP;350 }351 352 return 0;353}354 355static int cc770_set_bittiming(struct net_device *dev)356{357 struct cc770_priv *priv = netdev_priv(dev);358 struct can_bittiming *bt = &priv->can.bittiming;359 u8 btr0, btr1;360 361 btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6);362 btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) |363 (((bt->phase_seg2 - 1) & 0x7) << 4);364 if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)365 btr1 |= 0x80;366 367 netdev_info(dev, "setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1);368 369 cc770_write_reg(priv, bit_timing_0, btr0);370 cc770_write_reg(priv, bit_timing_1, btr1);371 372 return 0;373}374 375static int cc770_get_berr_counter(const struct net_device *dev,376 struct can_berr_counter *bec)377{378 struct cc770_priv *priv = netdev_priv(dev);379 380 bec->txerr = cc770_read_reg(priv, tx_error_counter);381 bec->rxerr = cc770_read_reg(priv, rx_error_counter);382 383 return 0;384}385 386static void cc770_tx(struct net_device *dev, int mo)387{388 struct cc770_priv *priv = netdev_priv(dev);389 struct can_frame *cf = (struct can_frame *)priv->tx_skb->data;390 u8 dlc, rtr;391 u32 id;392 int i;393 394 dlc = cf->len;395 id = cf->can_id;396 rtr = cf->can_id & CAN_RTR_FLAG ? 0 : MSGCFG_DIR;397 398 cc770_write_reg(priv, msgobj[mo].ctrl0,399 MSGVAL_RES | TXIE_RES | RXIE_RES | INTPND_RES);400 cc770_write_reg(priv, msgobj[mo].ctrl1,401 RMTPND_RES | TXRQST_RES | CPUUPD_SET | NEWDAT_RES);402 403 if (id & CAN_EFF_FLAG) {404 id &= CAN_EFF_MASK;405 cc770_write_reg(priv, msgobj[mo].config,406 (dlc << 4) | rtr | MSGCFG_XTD);407 cc770_write_reg(priv, msgobj[mo].id[3], id << 3);408 cc770_write_reg(priv, msgobj[mo].id[2], id >> 5);409 cc770_write_reg(priv, msgobj[mo].id[1], id >> 13);410 cc770_write_reg(priv, msgobj[mo].id[0], id >> 21);411 } else {412 id &= CAN_SFF_MASK;413 cc770_write_reg(priv, msgobj[mo].config, (dlc << 4) | rtr);414 cc770_write_reg(priv, msgobj[mo].id[0], id >> 3);415 cc770_write_reg(priv, msgobj[mo].id[1], id << 5);416 }417 418 for (i = 0; i < dlc; i++)419 cc770_write_reg(priv, msgobj[mo].data[i], cf->data[i]);420 421 cc770_write_reg(priv, msgobj[mo].ctrl1,422 RMTPND_UNC | TXRQST_SET | CPUUPD_RES | NEWDAT_UNC);423 cc770_write_reg(priv, msgobj[mo].ctrl0,424 MSGVAL_SET | TXIE_SET | RXIE_SET | INTPND_UNC);425}426 427static netdev_tx_t cc770_start_xmit(struct sk_buff *skb, struct net_device *dev)428{429 struct cc770_priv *priv = netdev_priv(dev);430 unsigned int mo = obj2msgobj(CC770_OBJ_TX);431 432 if (can_dev_dropped_skb(dev, skb))433 return NETDEV_TX_OK;434 435 netif_stop_queue(dev);436 437 if ((cc770_read_reg(priv,438 msgobj[mo].ctrl1) & TXRQST_UNC) == TXRQST_SET) {439 netdev_err(dev, "TX register is still occupied!\n");440 return NETDEV_TX_BUSY;441 }442 443 priv->tx_skb = skb;444 cc770_tx(dev, mo);445 446 return NETDEV_TX_OK;447}448 449static void cc770_rx(struct net_device *dev, unsigned int mo, u8 ctrl1)450{451 struct cc770_priv *priv = netdev_priv(dev);452 struct net_device_stats *stats = &dev->stats;453 struct can_frame *cf;454 struct sk_buff *skb;455 u8 config;456 u32 id;457 int i;458 459 skb = alloc_can_skb(dev, &cf);460 if (!skb)461 return;462 463 config = cc770_read_reg(priv, msgobj[mo].config);464 465 if (ctrl1 & RMTPND_SET) {466 /*467 * Unfortunately, the chip does not store the real message468 * identifier of the received remote transmission request469 * frame. Therefore we set it to 0.470 */471 cf->can_id = CAN_RTR_FLAG;472 if (config & MSGCFG_XTD)473 cf->can_id |= CAN_EFF_FLAG;474 cf->len = 0;475 } else {476 if (config & MSGCFG_XTD) {477 id = cc770_read_reg(priv, msgobj[mo].id[3]);478 id |= cc770_read_reg(priv, msgobj[mo].id[2]) << 8;479 id |= cc770_read_reg(priv, msgobj[mo].id[1]) << 16;480 id |= cc770_read_reg(priv, msgobj[mo].id[0]) << 24;481 id >>= 3;482 id |= CAN_EFF_FLAG;483 } else {484 id = cc770_read_reg(priv, msgobj[mo].id[1]);485 id |= cc770_read_reg(priv, msgobj[mo].id[0]) << 8;486 id >>= 5;487 }488 489 cf->can_id = id;490 cf->len = can_cc_dlc2len((config & 0xf0) >> 4);491 for (i = 0; i < cf->len; i++)492 cf->data[i] = cc770_read_reg(priv, msgobj[mo].data[i]);493 494 stats->rx_bytes += cf->len;495 }496 stats->rx_packets++;497 498 netif_rx(skb);499}500 501static int cc770_err(struct net_device *dev, u8 status)502{503 struct cc770_priv *priv = netdev_priv(dev);504 struct can_frame *cf;505 struct sk_buff *skb;506 u8 lec;507 508 netdev_dbg(dev, "status interrupt (%#x)\n", status);509 510 skb = alloc_can_err_skb(dev, &cf);511 if (!skb)512 return -ENOMEM;513 514 /* Use extended functions of the CC770 */515 if (priv->control_normal_mode & CTRL_EAF) {516 cf->can_id |= CAN_ERR_CNT;517 cf->data[6] = cc770_read_reg(priv, tx_error_counter);518 cf->data[7] = cc770_read_reg(priv, rx_error_counter);519 }520 521 if (status & STAT_BOFF) {522 /* Disable interrupts */523 cc770_write_reg(priv, control, CTRL_INI);524 cf->can_id |= CAN_ERR_BUSOFF;525 priv->can.state = CAN_STATE_BUS_OFF;526 priv->can.can_stats.bus_off++;527 can_bus_off(dev);528 } else if (status & STAT_WARN) {529 cf->can_id |= CAN_ERR_CRTL;530 /* Only the CC770 does show error passive */531 if (cf->data[7] > 127) {532 cf->data[1] = CAN_ERR_CRTL_RX_PASSIVE |533 CAN_ERR_CRTL_TX_PASSIVE;534 priv->can.state = CAN_STATE_ERROR_PASSIVE;535 priv->can.can_stats.error_passive++;536 } else {537 cf->data[1] = CAN_ERR_CRTL_RX_WARNING |538 CAN_ERR_CRTL_TX_WARNING;539 priv->can.state = CAN_STATE_ERROR_WARNING;540 priv->can.can_stats.error_warning++;541 }542 } else {543 /* Back to error active */544 cf->can_id |= CAN_ERR_PROT;545 cf->data[2] = CAN_ERR_PROT_ACTIVE;546 priv->can.state = CAN_STATE_ERROR_ACTIVE;547 }548 549 lec = status & STAT_LEC_MASK;550 if (lec < 7 && lec > 0) {551 if (lec == STAT_LEC_ACK) {552 cf->can_id |= CAN_ERR_ACK;553 } else {554 cf->can_id |= CAN_ERR_PROT;555 switch (lec) {556 case STAT_LEC_STUFF:557 cf->data[2] |= CAN_ERR_PROT_STUFF;558 break;559 case STAT_LEC_FORM:560 cf->data[2] |= CAN_ERR_PROT_FORM;561 break;562 case STAT_LEC_BIT1:563 cf->data[2] |= CAN_ERR_PROT_BIT1;564 break;565 case STAT_LEC_BIT0:566 cf->data[2] |= CAN_ERR_PROT_BIT0;567 break;568 case STAT_LEC_CRC:569 cf->data[3] = CAN_ERR_PROT_LOC_CRC_SEQ;570 break;571 }572 }573 }574 575 576 netif_rx(skb);577 578 return 0;579}580 581static int cc770_status_interrupt(struct net_device *dev)582{583 struct cc770_priv *priv = netdev_priv(dev);584 u8 status;585 586 status = cc770_read_reg(priv, status);587 /* Reset the status register including RXOK and TXOK */588 cc770_write_reg(priv, status, STAT_LEC_MASK);589 590 if (status & (STAT_WARN | STAT_BOFF) ||591 (status & STAT_LEC_MASK) != STAT_LEC_MASK) {592 cc770_err(dev, status);593 return status & STAT_BOFF;594 }595 596 return 0;597}598 599static void cc770_rx_interrupt(struct net_device *dev, unsigned int o)600{601 struct cc770_priv *priv = netdev_priv(dev);602 struct net_device_stats *stats = &dev->stats;603 unsigned int mo = obj2msgobj(o);604 u8 ctrl1;605 int n = CC770_MAX_MSG;606 607 while (n--) {608 ctrl1 = cc770_read_reg(priv, msgobj[mo].ctrl1);609 610 if (!(ctrl1 & NEWDAT_SET)) {611 /* Check for RTR if additional functions are enabled */612 if (priv->control_normal_mode & CTRL_EAF) {613 if (!(cc770_read_reg(priv, msgobj[mo].ctrl0) &614 INTPND_SET))615 break;616 } else {617 break;618 }619 }620 621 if (ctrl1 & MSGLST_SET) {622 stats->rx_over_errors++;623 stats->rx_errors++;624 }625 if (mo < MSGOBJ_LAST)626 cc770_write_reg(priv, msgobj[mo].ctrl1,627 NEWDAT_RES | MSGLST_RES |628 TXRQST_UNC | RMTPND_UNC);629 cc770_rx(dev, mo, ctrl1);630 631 cc770_write_reg(priv, msgobj[mo].ctrl0,632 MSGVAL_SET | TXIE_RES |633 RXIE_SET | INTPND_RES);634 cc770_write_reg(priv, msgobj[mo].ctrl1,635 NEWDAT_RES | MSGLST_RES |636 TXRQST_RES | RMTPND_RES);637 }638}639 640static void cc770_rtr_interrupt(struct net_device *dev, unsigned int o)641{642 struct cc770_priv *priv = netdev_priv(dev);643 unsigned int mo = obj2msgobj(o);644 u8 ctrl0, ctrl1;645 int n = CC770_MAX_MSG;646 647 while (n--) {648 ctrl0 = cc770_read_reg(priv, msgobj[mo].ctrl0);649 if (!(ctrl0 & INTPND_SET))650 break;651 652 ctrl1 = cc770_read_reg(priv, msgobj[mo].ctrl1);653 cc770_rx(dev, mo, ctrl1);654 655 cc770_write_reg(priv, msgobj[mo].ctrl0,656 MSGVAL_SET | TXIE_RES |657 RXIE_SET | INTPND_RES);658 cc770_write_reg(priv, msgobj[mo].ctrl1,659 NEWDAT_RES | CPUUPD_SET |660 TXRQST_RES | RMTPND_RES);661 }662}663 664static void cc770_tx_interrupt(struct net_device *dev, unsigned int o)665{666 struct cc770_priv *priv = netdev_priv(dev);667 struct net_device_stats *stats = &dev->stats;668 unsigned int mo = obj2msgobj(o);669 u8 ctrl1;670 671 ctrl1 = cc770_read_reg(priv, msgobj[mo].ctrl1);672 673 cc770_write_reg(priv, msgobj[mo].ctrl0,674 MSGVAL_RES | TXIE_RES | RXIE_RES | INTPND_RES);675 cc770_write_reg(priv, msgobj[mo].ctrl1,676 RMTPND_RES | TXRQST_RES | MSGLST_RES | NEWDAT_RES);677 678 if (unlikely(!priv->tx_skb)) {679 netdev_err(dev, "missing tx skb in tx interrupt\n");680 return;681 }682 683 if (unlikely(ctrl1 & MSGLST_SET)) {684 stats->rx_over_errors++;685 stats->rx_errors++;686 }687 688 /* When the CC770 is sending an RTR message and it receives a regular689 * message that matches the id of the RTR message, it will overwrite the690 * outgoing message in the TX register. When this happens we must691 * process the received message and try to transmit the outgoing skb692 * again.693 */694 if (unlikely(ctrl1 & NEWDAT_SET)) {695 cc770_rx(dev, mo, ctrl1);696 cc770_tx(dev, mo);697 return;698 }699 700 can_put_echo_skb(priv->tx_skb, dev, 0, 0);701 stats->tx_bytes += can_get_echo_skb(dev, 0, NULL);702 stats->tx_packets++;703 priv->tx_skb = NULL;704 705 netif_wake_queue(dev);706}707 708static irqreturn_t cc770_interrupt(int irq, void *dev_id)709{710 struct net_device *dev = (struct net_device *)dev_id;711 struct cc770_priv *priv = netdev_priv(dev);712 u8 intid;713 int o, n = 0;714 715 /* Shared interrupts and IRQ off? */716 if (priv->can.state == CAN_STATE_STOPPED)717 return IRQ_NONE;718 719 if (priv->pre_irq)720 priv->pre_irq(priv);721 722 while (n < CC770_MAX_IRQ) {723 /* Read the highest pending interrupt request */724 intid = cc770_read_reg(priv, interrupt);725 if (!intid)726 break;727 n++;728 729 if (intid == 1) {730 /* Exit in case of bus-off */731 if (cc770_status_interrupt(dev))732 break;733 } else {734 o = intid2obj(intid);735 736 if (o >= CC770_OBJ_MAX) {737 netdev_err(dev, "Unexpected interrupt id %d\n",738 intid);739 continue;740 }741 742 if (priv->obj_flags[o] & CC770_OBJ_FLAG_RTR)743 cc770_rtr_interrupt(dev, o);744 else if (priv->obj_flags[o] & CC770_OBJ_FLAG_RX)745 cc770_rx_interrupt(dev, o);746 else747 cc770_tx_interrupt(dev, o);748 }749 }750 751 if (priv->post_irq)752 priv->post_irq(priv);753 754 if (n >= CC770_MAX_IRQ)755 netdev_dbg(dev, "%d messages handled in ISR", n);756 757 return (n) ? IRQ_HANDLED : IRQ_NONE;758}759 760static int cc770_open(struct net_device *dev)761{762 struct cc770_priv *priv = netdev_priv(dev);763 int err;764 765 /* set chip into reset mode */766 set_reset_mode(dev);767 768 /* common open */769 err = open_candev(dev);770 if (err)771 return err;772 773 err = request_irq(dev->irq, &cc770_interrupt, priv->irq_flags,774 dev->name, dev);775 if (err) {776 close_candev(dev);777 return -EAGAIN;778 }779 780 /* init and start chip */781 cc770_start(dev);782 783 netif_start_queue(dev);784 785 return 0;786}787 788static int cc770_close(struct net_device *dev)789{790 netif_stop_queue(dev);791 set_reset_mode(dev);792 793 free_irq(dev->irq, dev);794 close_candev(dev);795 796 return 0;797}798 799struct net_device *alloc_cc770dev(int sizeof_priv)800{801 struct net_device *dev;802 struct cc770_priv *priv;803 804 dev = alloc_candev(sizeof(struct cc770_priv) + sizeof_priv,805 CC770_ECHO_SKB_MAX);806 if (!dev)807 return NULL;808 809 priv = netdev_priv(dev);810 811 priv->dev = dev;812 priv->can.bittiming_const = &cc770_bittiming_const;813 priv->can.do_set_bittiming = cc770_set_bittiming;814 priv->can.do_set_mode = cc770_set_mode;815 priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES;816 priv->tx_skb = NULL;817 818 memcpy(priv->obj_flags, cc770_obj_flags, sizeof(cc770_obj_flags));819 820 if (sizeof_priv)821 priv->priv = (void *)priv + sizeof(struct cc770_priv);822 823 return dev;824}825EXPORT_SYMBOL_GPL(alloc_cc770dev);826 827void free_cc770dev(struct net_device *dev)828{829 free_candev(dev);830}831EXPORT_SYMBOL_GPL(free_cc770dev);832 833static const struct net_device_ops cc770_netdev_ops = {834 .ndo_open = cc770_open,835 .ndo_stop = cc770_close,836 .ndo_start_xmit = cc770_start_xmit,837 .ndo_change_mtu = can_change_mtu,838};839 840static const struct ethtool_ops cc770_ethtool_ops = {841 .get_ts_info = ethtool_op_get_ts_info,842};843 844int register_cc770dev(struct net_device *dev)845{846 struct cc770_priv *priv = netdev_priv(dev);847 int err;848 849 err = cc770_probe_chip(dev);850 if (err)851 return err;852 853 dev->netdev_ops = &cc770_netdev_ops;854 dev->ethtool_ops = &cc770_ethtool_ops;855 856 dev->flags |= IFF_ECHO; /* we support local echo */857 858 /* Should we use additional functions? */859 if (!i82527_compat && priv->control_normal_mode & CTRL_EAF) {860 priv->can.do_get_berr_counter = cc770_get_berr_counter;861 priv->control_normal_mode = CTRL_IE | CTRL_EAF | CTRL_EIE;862 netdev_dbg(dev, "i82527 mode with additional functions\n");863 } else {864 priv->control_normal_mode = CTRL_IE | CTRL_EIE;865 netdev_dbg(dev, "strict i82527 compatibility mode\n");866 }867 868 chipset_init(priv);869 set_reset_mode(dev);870 871 return register_candev(dev);872}873EXPORT_SYMBOL_GPL(register_cc770dev);874 875void unregister_cc770dev(struct net_device *dev)876{877 set_reset_mode(dev);878 unregister_candev(dev);879}880EXPORT_SYMBOL_GPL(unregister_cc770dev);881 882static __init int cc770_init(void)883{884 if (msgobj15_eff) {885 cc770_obj_flags[CC770_OBJ_RX0] |= CC770_OBJ_FLAG_EFF;886 cc770_obj_flags[CC770_OBJ_RX1] &= ~CC770_OBJ_FLAG_EFF;887 }888 889 pr_info("CAN netdevice driver\n");890 891 return 0;892}893module_init(cc770_init);894 895static __exit void cc770_exit(void)896{897 pr_info("driver removed\n");898}899module_exit(cc770_exit);900