kernel/drivers/net/can/pch_can.c

   1 /*
   2  * Copyright (C) 1999 - 2010 Intel Corporation.
   3  * Copyright (C) 2010 LAPIS SEMICONDUCTOR CO., LTD.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; version 2 of the License.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include <linux/interrupt.h>
  19 #include <linux/delay.h>
  20 #include <linux/io.h>
  21 #include <linux/module.h>
  22 #include <linux/sched.h>
  23 #include <linux/pci.h>
  24 #include <linux/kernel.h>
  25 #include <linux/types.h>
  26 #include <linux/errno.h>
  27 #include <linux/netdevice.h>
  28 #include <linux/skbuff.h>
  29 #include <linux/can.h>
  30 #include <linux/can/dev.h>
  31 #include <linux/can/error.h>
  32
  33 #define PCH_CTRL_INIT           BIT(0) /* The INIT bit of CANCONT register. */
  34 #define PCH_CTRL_IE             BIT(1) /* The IE bit of CAN control register */
  35 #define PCH_CTRL_IE_SIE_EIE     (BIT(3) | BIT(2) | BIT(1))
  36 #define PCH_CTRL_CCE            BIT(6)
  37 #define PCH_CTRL_OPT            BIT(7) /* The OPT bit of CANCONT register. */
  38 #define PCH_OPT_SILENT          BIT(3) /* The Silent bit of CANOPT reg. */
  39 #define PCH_OPT_LBACK           BIT(4) /* The LoopBack bit of CANOPT reg. */
  40
  41 #define PCH_CMASK_RX_TX_SET     0x00f3
  42 #define PCH_CMASK_RX_TX_GET     0x0073
  43 #define PCH_CMASK_ALL           0xff
  44 #define PCH_CMASK_NEWDAT        BIT(2)
  45 #define PCH_CMASK_CLRINTPND     BIT(3)
  46 #define PCH_CMASK_CTRL          BIT(4)
  47 #define PCH_CMASK_ARB           BIT(5)
  48 #define PCH_CMASK_MASK          BIT(6)
  49 #define PCH_CMASK_RDWR          BIT(7)
  50 #define PCH_IF_MCONT_NEWDAT     BIT(15)
  51 #define PCH_IF_MCONT_MSGLOST    BIT(14)
  52 #define PCH_IF_MCONT_INTPND     BIT(13)
  53 #define PCH_IF_MCONT_UMASK      BIT(12)
  54 #define PCH_IF_MCONT_TXIE       BIT(11)
  55 #define PCH_IF_MCONT_RXIE       BIT(10)
  56 #define PCH_IF_MCONT_RMTEN      BIT(9)
  57 #define PCH_IF_MCONT_TXRQXT     BIT(8)
  58 #define PCH_IF_MCONT_EOB        BIT(7)
  59 #define PCH_IF_MCONT_DLC        (BIT(0) | BIT(1) | BIT(2) | BIT(3))
  60 #define PCH_MASK2_MDIR_MXTD     (BIT(14) | BIT(15))
  61 #define PCH_ID2_DIR             BIT(13)
  62 #define PCH_ID2_XTD             BIT(14)
  63 #define PCH_ID_MSGVAL           BIT(15)
  64 #define PCH_IF_CREQ_BUSY        BIT(15)
  65
  66 #define PCH_STATUS_INT          0x8000
  67 #define PCH_RP                  0x00008000
  68 #define PCH_REC                 0x00007f00
  69 #define PCH_TEC                 0x000000ff
  70
  71 #define PCH_TX_OK               BIT(3)
  72 #define PCH_RX_OK               BIT(4)
  73 #define PCH_EPASSIV             BIT(5)
  74 #define PCH_EWARN               BIT(6)
  75 #define PCH_BUS_OFF             BIT(7)
  76
  77 /* bit position of certain controller bits. */
  78 #define PCH_BIT_BRP_SHIFT       0
  79 #define PCH_BIT_SJW_SHIFT       6
  80 #define PCH_BIT_TSEG1_SHIFT     8
  81 #define PCH_BIT_TSEG2_SHIFT     12
  82 #define PCH_BIT_BRPE_BRPE_SHIFT 6
  83
  84 #define PCH_MSK_BITT_BRP        0x3f
  85 #define PCH_MSK_BRPE_BRPE       0x3c0
  86 #define PCH_MSK_CTRL_IE_SIE_EIE 0x07
  87 #define PCH_COUNTER_LIMIT       10
  88
  89 #define PCH_CAN_CLK             50000000        /* 50MHz */
  90
  91 /*
  92  * Define the number of message object.
  93  * PCH CAN communications are done via Message RAM.
  94  * The Message RAM consists of 32 message objects.
  95  */
  96 #define PCH_RX_OBJ_NUM          26
  97 #define PCH_TX_OBJ_NUM          6
  98 #define PCH_RX_OBJ_START        1
  99 #define PCH_RX_OBJ_END          PCH_RX_OBJ_NUM
 100 #define PCH_TX_OBJ_START        (PCH_RX_OBJ_END + 1)
 101 #define PCH_TX_OBJ_END          (PCH_RX_OBJ_NUM + PCH_TX_OBJ_NUM)
 102
 103 #define PCH_FIFO_THRESH         16
 104
 105 /* TxRqst2 show status of MsgObjNo.17~32 */
 106 #define PCH_TREQ2_TX_MASK       (((1 << PCH_TX_OBJ_NUM) - 1) <<\
 107                                                         (PCH_RX_OBJ_END - 16))
 108
 109 enum pch_ifreg {
 110         PCH_RX_IFREG,
 111         PCH_TX_IFREG,
 112 };
 113
 114 enum pch_can_err {
 115         PCH_STUF_ERR = 1,
 116         PCH_FORM_ERR,
 117         PCH_ACK_ERR,
 118         PCH_BIT1_ERR,
 119         PCH_BIT0_ERR,
 120         PCH_CRC_ERR,
 121         PCH_LEC_ALL,
 122 };
 123
 124 enum pch_can_mode {
 125         PCH_CAN_ENABLE,
 126         PCH_CAN_DISABLE,
 127         PCH_CAN_ALL,
 128         PCH_CAN_NONE,
 129         PCH_CAN_STOP,
 130         PCH_CAN_RUN,
 131 };
 132
 133 struct pch_can_if_regs {
 134         u32 creq;
 135         u32 cmask;
 136         u32 mask1;
 137         u32 mask2;
 138         u32 id1;
 139         u32 id2;
 140         u32 mcont;
 141         u32 data[4];
 142         u32 rsv[13];
 143 };
 144
 145 struct pch_can_regs {
 146         u32 cont;
 147         u32 stat;
 148         u32 errc;
 149         u32 bitt;
 150         u32 intr;
 151         u32 opt;
 152         u32 brpe;
 153         u32 reserve;
 154         struct pch_can_if_regs ifregs[2]; /* [0]=if1  [1]=if2 */
 155         u32 reserve1[8];
 156         u32 treq1;
 157         u32 treq2;
 158         u32 reserve2[6];
 159         u32 data1;
 160         u32 data2;
 161         u32 reserve3[6];
 162         u32 canipend1;
 163         u32 canipend2;
 164         u32 reserve4[6];
 165         u32 canmval1;
 166         u32 canmval2;
 167         u32 reserve5[37];
 168         u32 srst;
 169 };
 170
 171 struct pch_can_priv {
 172         struct can_priv can;
 173         struct pci_dev *dev;
 174         u32 tx_enable[PCH_TX_OBJ_END];
 175         u32 rx_enable[PCH_TX_OBJ_END];
 176         u32 rx_link[PCH_TX_OBJ_END];
 177         u32 int_enables;
 178         struct net_device *ndev;
 179         struct pch_can_regs __iomem *regs;
 180         struct napi_struct napi;
 181         int tx_obj;     /* Point next Tx Obj index */
 182         int use_msi;
 183 };
 184
 185 static const struct can_bittiming_const pch_can_bittiming_const = {
 186         .name = KBUILD_MODNAME,
 187         .tseg1_min = 2,
 188         .tseg1_max = 16,
 189         .tseg2_min = 1,
 190         .tseg2_max = 8,
 191         .sjw_max = 4,
 192         .brp_min = 1,
 193         .brp_max = 1024, /* 6bit + extended 4bit */
 194         .brp_inc = 1,
 195 };
 196
 197 static const struct pci_device_id pch_pci_tbl[] = {
 198         {PCI_VENDOR_ID_INTEL, 0x8818, PCI_ANY_ID, PCI_ANY_ID,},
 199         {0,}
 200 };
 201 MODULE_DEVICE_TABLE(pci, pch_pci_tbl);
 202
 203 static inline void pch_can_bit_set(void __iomem *addr, u32 mask)
 204 {
 205         iowrite32(ioread32(addr) | mask, addr);
 206 }
 207
 208 static inline void pch_can_bit_clear(void __iomem *addr, u32 mask)
 209 {
 210         iowrite32(ioread32(addr) & ~mask, addr);
 211 }
 212
 213 static void pch_can_set_run_mode(struct pch_can_priv *priv,
 214                                  enum pch_can_mode mode)
 215 {
 216         switch (mode) {
 217         case PCH_CAN_RUN:
 218                 pch_can_bit_clear(&priv->regs->cont, PCH_CTRL_INIT);
 219                 break;
 220
 221         case PCH_CAN_STOP:
 222                 pch_can_bit_set(&priv->regs->cont, PCH_CTRL_INIT);
 223                 break;
 224
 225         default:
 226                 netdev_err(priv->ndev, "%s -> Invalid Mode.\n", __func__);
 227                 break;
 228         }
 229 }
 230
 231 static void pch_can_set_optmode(struct pch_can_priv *priv)
 232 {
 233         u32 reg_val = ioread32(&priv->regs->opt);
 234
 235         if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
 236                 reg_val |= PCH_OPT_SILENT;
 237
 238         if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK)
 239                 reg_val |= PCH_OPT_LBACK;
 240
 241         pch_can_bit_set(&priv->regs->cont, PCH_CTRL_OPT);
 242         iowrite32(reg_val, &priv->regs->opt);
 243 }
 244
 245 static void pch_can_rw_msg_obj(void __iomem *creq_addr, u32 num)
 246 {
 247         int counter = PCH_COUNTER_LIMIT;
 248         u32 ifx_creq;
 249
 250         iowrite32(num, creq_addr);
 251         while (counter) {
 252                 ifx_creq = ioread32(creq_addr) & PCH_IF_CREQ_BUSY;
 253                 if (!ifx_creq)
 254                         break;
 255                 counter--;
 256                 udelay(1);
 257         }
 258         if (!counter)
 259                 pr_err("%s:IF1 BUSY Flag is set forever.\n", __func__);
 260 }
 261
 262 static void pch_can_set_int_enables(struct pch_can_priv *priv,
 263                                     enum pch_can_mode interrupt_no)
 264 {
 265         switch (interrupt_no) {
 266         case PCH_CAN_DISABLE:
 267                 pch_can_bit_clear(&priv->regs->cont, PCH_CTRL_IE);
 268                 break;
 269
 270         case PCH_CAN_ALL:
 271                 pch_can_bit_set(&priv->regs->cont, PCH_CTRL_IE_SIE_EIE);
 272                 break;
 273
 274         case PCH_CAN_NONE:
 275                 pch_can_bit_clear(&priv->regs->cont, PCH_CTRL_IE_SIE_EIE);
 276                 break;
 277
 278         default:
 279                 netdev_err(priv->ndev, "Invalid interrupt number.\n");
 280                 break;
 281         }
 282 }
 283
 284 static void pch_can_set_rxtx(struct pch_can_priv *priv, u32 buff_num,
 285                              int set, enum pch_ifreg dir)
 286 {
 287         u32 ie;
 288
 289         if (dir)
 290                 ie = PCH_IF_MCONT_TXIE;
 291         else
 292                 ie = PCH_IF_MCONT_RXIE;
 293
 294         /* Reading the Msg buffer from Message RAM to IF1/2 registers. */
 295         iowrite32(PCH_CMASK_RX_TX_GET, &priv->regs->ifregs[dir].cmask);
 296         pch_can_rw_msg_obj(&priv->regs->ifregs[dir].creq, buff_num);
 297
 298         /* Setting the IF1/2MASK1 register to access MsgVal and RxIE bits */
 299         iowrite32(PCH_CMASK_RDWR | PCH_CMASK_ARB | PCH_CMASK_CTRL,
 300                   &priv->regs->ifregs[dir].cmask);
 301
 302         if (set) {
 303                 /* Setting the MsgVal and RxIE/TxIE bits */
 304                 pch_can_bit_set(&priv->regs->ifregs[dir].mcont, ie);
 305                 pch_can_bit_set(&priv->regs->ifregs[dir].id2, PCH_ID_MSGVAL);
 306         } else {
 307                 /* Clearing the MsgVal and RxIE/TxIE bits */
 308                 pch_can_bit_clear(&priv->regs->ifregs[dir].mcont, ie);
 309                 pch_can_bit_clear(&priv->regs->ifregs[dir].id2, PCH_ID_MSGVAL);
 310         }
 311
 312         pch_can_rw_msg_obj(&priv->regs->ifregs[dir].creq, buff_num);
 313 }
 314
 315 static void pch_can_set_rx_all(struct pch_can_priv *priv, int set)
 316 {
 317         int i;
 318
 319         /* Traversing to obtain the object configured as receivers. */
 320         for (i = PCH_RX_OBJ_START; i <= PCH_RX_OBJ_END; i++)
 321                 pch_can_set_rxtx(priv, i, set, PCH_RX_IFREG);
 322 }
 323
 324 static void pch_can_set_tx_all(struct pch_can_priv *priv, int set)
 325 {
 326         int i;
 327
 328         /* Traversing to obtain the object configured as transmit object. */
 329         for (i = PCH_TX_OBJ_START; i <= PCH_TX_OBJ_END; i++)
 330                 pch_can_set_rxtx(priv, i, set, PCH_TX_IFREG);
 331 }
 332
 333 static u32 pch_can_int_pending(struct pch_can_priv *priv)
 334 {
 335         return ioread32(&priv->regs->intr) & 0xffff;
 336 }
 337
 338 static void pch_can_clear_if_buffers(struct pch_can_priv *priv)
 339 {
 340         int i; /* Msg Obj ID (1~32) */
 341
 342         for (i = PCH_RX_OBJ_START; i <= PCH_TX_OBJ_END; i++) {
 343                 iowrite32(PCH_CMASK_RX_TX_SET, &priv->regs->ifregs[0].cmask);
 344                 iowrite32(0xffff, &priv->regs->ifregs[0].mask1);
 345                 iowrite32(0xffff, &priv->regs->ifregs[0].mask2);
 346                 iowrite32(0x0, &priv->regs->ifregs[0].id1);
 347                 iowrite32(0x0, &priv->regs->ifregs[0].id2);
 348                 iowrite32(0x0, &priv->regs->ifregs[0].mcont);
 349                 iowrite32(0x0, &priv->regs->ifregs[0].data[0]);
 350                 iowrite32(0x0, &priv->regs->ifregs[0].data[1]);
 351                 iowrite32(0x0, &priv->regs->ifregs[0].data[2]);
 352                 iowrite32(0x0, &priv->regs->ifregs[0].data[3]);
 353                 iowrite32(PCH_CMASK_RDWR | PCH_CMASK_MASK |
 354                           PCH_CMASK_ARB | PCH_CMASK_CTRL,
 355                           &priv->regs->ifregs[0].cmask);
 356                 pch_can_rw_msg_obj(&priv->regs->ifregs[0].creq, i);
 357         }
 358 }
 359
 360 static void pch_can_config_rx_tx_buffers(struct pch_can_priv *priv)
 361 {
 362         int i;
 363
 364         for (i = PCH_RX_OBJ_START; i <= PCH_RX_OBJ_END; i++) {
 365                 iowrite32(PCH_CMASK_RX_TX_GET, &priv->regs->ifregs[0].cmask);
 366                 pch_can_rw_msg_obj(&priv->regs->ifregs[0].creq, i);
 367
 368                 iowrite32(0x0, &priv->regs->ifregs[0].id1);
 369                 iowrite32(0x0, &priv->regs->ifregs[0].id2);
 370
 371                 pch_can_bit_set(&priv->regs->ifregs[0].mcont,
 372                                 PCH_IF_MCONT_UMASK);
 373
 374                 /* In case FIFO mode, Last EoB of Rx Obj must be 1 */
 375                 if (i == PCH_RX_OBJ_END)
 376                         pch_can_bit_set(&priv->regs->ifregs[0].mcont,
 377                                         PCH_IF_MCONT_EOB);
 378                 else
 379                         pch_can_bit_clear(&priv->regs->ifregs[0].mcont,
 380                                           PCH_IF_MCONT_EOB);
 381
 382                 iowrite32(0, &priv->regs->ifregs[0].mask1);
 383                 pch_can_bit_clear(&priv->regs->ifregs[0].mask2,
 384                                   0x1fff | PCH_MASK2_MDIR_MXTD);
 385
 386                 /* Setting CMASK for writing */
 387                 iowrite32(PCH_CMASK_RDWR | PCH_CMASK_MASK | PCH_CMASK_ARB |
 388                           PCH_CMASK_CTRL, &priv->regs->ifregs[0].cmask);
 389
 390                 pch_can_rw_msg_obj(&priv->regs->ifregs[0].creq, i);
 391         }
 392
 393         for (i = PCH_TX_OBJ_START; i <= PCH_TX_OBJ_END; i++) {
 394                 iowrite32(PCH_CMASK_RX_TX_GET, &priv->regs->ifregs[1].cmask);
 395                 pch_can_rw_msg_obj(&priv->regs->ifregs[1].creq, i);
 396
 397                 /* Resetting DIR bit for reception */
 398                 iowrite32(0x0, &priv->regs->ifregs[1].id1);
 399                 iowrite32(PCH_ID2_DIR, &priv->regs->ifregs[1].id2);
 400
 401                 /* Setting EOB bit for transmitter */
 402                 iowrite32(PCH_IF_MCONT_EOB | PCH_IF_MCONT_UMASK,
 403                           &priv->regs->ifregs[1].mcont);
 404
 405                 iowrite32(0, &priv->regs->ifregs[1].mask1);
 406                 pch_can_bit_clear(&priv->regs->ifregs[1].mask2, 0x1fff);
 407
 408                 /* Setting CMASK for writing */
 409                 iowrite32(PCH_CMASK_RDWR | PCH_CMASK_MASK | PCH_CMASK_ARB |
 410                           PCH_CMASK_CTRL, &priv->regs->ifregs[1].cmask);
 411
 412                 pch_can_rw_msg_obj(&priv->regs->ifregs[1].creq, i);
 413         }
 414 }
 415
 416 static void pch_can_init(struct pch_can_priv *priv)
 417 {
 418         /* Stopping the Can device. */
 419         pch_can_set_run_mode(priv, PCH_CAN_STOP);
 420
 421         /* Clearing all the message object buffers. */
 422         pch_can_clear_if_buffers(priv);
 423
 424         /* Configuring the respective message object as either rx/tx object. */
 425         pch_can_config_rx_tx_buffers(priv);
 426
 427         /* Enabling the interrupts. */
 428         pch_can_set_int_enables(priv, PCH_CAN_ALL);
 429 }
 430
 431 static void pch_can_release(struct pch_can_priv *priv)
 432 {
 433         /* Stooping the CAN device. */
 434         pch_can_set_run_mode(priv, PCH_CAN_STOP);
 435
 436         /* Disabling the interrupts. */
 437         pch_can_set_int_enables(priv, PCH_CAN_NONE);
 438
 439         /* Disabling all the receive object. */
 440         pch_can_set_rx_all(priv, 0);
 441
 442         /* Disabling all the transmit object. */
 443         pch_can_set_tx_all(priv, 0);
 444 }
 445
 446 /* This function clears interrupt(s) from the CAN device. */
 447 static void pch_can_int_clr(struct pch_can_priv *priv, u32 mask)
 448 {
 449         /* Clear interrupt for transmit object */
 450         if ((mask >= PCH_RX_OBJ_START) && (mask <= PCH_RX_OBJ_END)) {
 451                 /* Setting CMASK for clearing the reception interrupts. */
 452                 iowrite32(PCH_CMASK_RDWR | PCH_CMASK_CTRL | PCH_CMASK_ARB,
 453                           &priv->regs->ifregs[0].cmask);
 454
 455                 /* Clearing the Dir bit. */
 456                 pch_can_bit_clear(&priv->regs->ifregs[0].id2, PCH_ID2_DIR);
 457
 458                 /* Clearing NewDat & IntPnd */
 459                 pch_can_bit_clear(&priv->regs->ifregs[0].mcont,
 460                                   PCH_IF_MCONT_NEWDAT | PCH_IF_MCONT_INTPND);
 461
 462                 pch_can_rw_msg_obj(&priv->regs->ifregs[0].creq, mask);
 463         } else if ((mask >= PCH_TX_OBJ_START) && (mask <= PCH_TX_OBJ_END)) {
 464                 /*
 465                  * Setting CMASK for clearing interrupts for frame transmission.
 466                  */
 467                 iowrite32(PCH_CMASK_RDWR | PCH_CMASK_CTRL | PCH_CMASK_ARB,
 468                           &priv->regs->ifregs[1].cmask);
 469
 470                 /* Resetting the ID registers. */
 471                 pch_can_bit_set(&priv->regs->ifregs[1].id2,
 472                                PCH_ID2_DIR | (0x7ff << 2));
 473                 iowrite32(0x0, &priv->regs->ifregs[1].id1);
 474
 475                 /* Claring NewDat, TxRqst & IntPnd */
 476                 pch_can_bit_clear(&priv->regs->ifregs[1].mcont,
 477                                   PCH_IF_MCONT_NEWDAT | PCH_IF_MCONT_INTPND |
 478                                   PCH_IF_MCONT_TXRQXT);
 479                 pch_can_rw_msg_obj(&priv->regs->ifregs[1].creq, mask);
 480         }
 481 }
 482
 483 static void pch_can_reset(struct pch_can_priv *priv)
 484 {
 485         /* write to sw reset register */
 486         iowrite32(1, &priv->regs->srst);
 487         iowrite32(0, &priv->regs->srst);
 488 }
 489
 490 static void pch_can_error(struct net_device *ndev, u32 status)
 491 {
 492         struct sk_buff *skb;
 493         struct pch_can_priv *priv = netdev_priv(ndev);
 494         struct can_frame *cf;
 495         u32 errc, lec;
 496         struct net_device_stats *stats = &(priv->ndev->stats);
 497         enum can_state state = priv->can.state;
 498
 499         skb = alloc_can_err_skb(ndev, &cf);
 500         if (!skb)
 501                 return;
 502
 503         if (status & PCH_BUS_OFF) {
 504                 pch_can_set_tx_all(priv, 0);
 505                 pch_can_set_rx_all(priv, 0);
 506                 state = CAN_STATE_BUS_OFF;
 507                 cf->can_id |= CAN_ERR_BUSOFF;
 508                 priv->can.can_stats.bus_off++;
 509                 can_bus_off(ndev);
 510         }
 511
 512         errc = ioread32(&priv->regs->errc);
 513         /* Warning interrupt. */
 514         if (status & PCH_EWARN) {
 515                 state = CAN_STATE_ERROR_WARNING;
 516                 priv->can.can_stats.error_warning++;
 517                 cf->can_id |= CAN_ERR_CRTL;
 518                 if (((errc & PCH_REC) >> 8) > 96)
 519                         cf->data[1] |= CAN_ERR_CRTL_RX_WARNING;
 520                 if ((errc & PCH_TEC) > 96)
 521                         cf->data[1] |= CAN_ERR_CRTL_TX_WARNING;
 522                 netdev_dbg(ndev,
 523                         "%s -> Error Counter is more than 96.\n", __func__);
 524         }
 525         /* Error passive interrupt. */
 526         if (status & PCH_EPASSIV) {
 527                 priv->can.can_stats.error_passive++;
 528                 state = CAN_STATE_ERROR_PASSIVE;
 529                 cf->can_id |= CAN_ERR_CRTL;
 530                 if (errc & PCH_RP)
 531                         cf->data[1] |= CAN_ERR_CRTL_RX_PASSIVE;
 532                 if ((errc & PCH_TEC) > 127)
 533                         cf->data[1] |= CAN_ERR_CRTL_TX_PASSIVE;
 534                 netdev_dbg(ndev,
 535                         "%s -> CAN controller is ERROR PASSIVE .\n", __func__);
 536         }
 537
 538         lec = status & PCH_LEC_ALL;
 539         switch (lec) {
 540         case PCH_STUF_ERR:
 541                 cf->data[2] |= CAN_ERR_PROT_STUFF;
 542                 priv->can.can_stats.bus_error++;
 543                 stats->rx_errors++;
 544                 break;
 545         case PCH_FORM_ERR:
 546                 cf->data[2] |= CAN_ERR_PROT_FORM;
 547                 priv->can.can_stats.bus_error++;
 548                 stats->rx_errors++;
 549                 break;
 550         case PCH_ACK_ERR:
 551                 cf->can_id |= CAN_ERR_ACK;
 552                 priv->can.can_stats.bus_error++;
 553                 stats->rx_errors++;
 554                 break;
 555         case PCH_BIT1_ERR:
 556         case PCH_BIT0_ERR:
 557                 cf->data[2] |= CAN_ERR_PROT_BIT;
 558                 priv->can.can_stats.bus_error++;
 559                 stats->rx_errors++;
 560                 break;
 561         case PCH_CRC_ERR:
 562                 cf->data[3] = CAN_ERR_PROT_LOC_CRC_SEQ;
 563                 priv->can.can_stats.bus_error++;
 564                 stats->rx_errors++;
 565                 break;
 566         case PCH_LEC_ALL: /* Written by CPU. No error status */
 567                 break;
 568         }
 569
 570         cf->data[6] = errc & PCH_TEC;
 571         cf->data[7] = (errc & PCH_REC) >> 8;
 572
 573         priv->can.state = state;
 574         netif_receive_skb(skb);
 575
 576         stats->rx_packets++;
 577         stats->rx_bytes += cf->can_dlc;
 578 }
 579
 580 static irqreturn_t pch_can_interrupt(int irq, void *dev_id)
 581 {
 582         struct net_device *ndev = (struct net_device *)dev_id;
 583         struct pch_can_priv *priv = netdev_priv(ndev);
 584
 585         if (!pch_can_int_pending(priv))
 586                 return IRQ_NONE;
 587
 588         pch_can_set_int_enables(priv, PCH_CAN_NONE);
 589         napi_schedule(&priv->napi);
 590         return IRQ_HANDLED;
 591 }
 592
 593 static void pch_fifo_thresh(struct pch_can_priv *priv, int obj_id)
 594 {
 595         if (obj_id < PCH_FIFO_THRESH) {
 596                 iowrite32(PCH_CMASK_RDWR | PCH_CMASK_CTRL |
 597                           PCH_CMASK_ARB, &priv->regs->ifregs[0].cmask);
 598
 599                 /* Clearing the Dir bit. */
 600                 pch_can_bit_clear(&priv->regs->ifregs[0].id2, PCH_ID2_DIR);
 601
 602                 /* Clearing NewDat & IntPnd */
 603                 pch_can_bit_clear(&priv->regs->ifregs[0].mcont,
 604                                   PCH_IF_MCONT_INTPND);
 605                 pch_can_rw_msg_obj(&priv->regs->ifregs[0].creq, obj_id);
 606         } else if (obj_id > PCH_FIFO_THRESH) {
 607                 pch_can_int_clr(priv, obj_id);
 608         } else if (obj_id == PCH_FIFO_THRESH) {
 609                 int cnt;
 610                 for (cnt = 0; cnt < PCH_FIFO_THRESH; cnt++)
 611                         pch_can_int_clr(priv, cnt + 1);
 612         }
 613 }
 614
 615 static void pch_can_rx_msg_lost(struct net_device *ndev, int obj_id)
 616 {
 617         struct pch_can_priv *priv = netdev_priv(ndev);
 618         struct net_device_stats *stats = &(priv->ndev->stats);
 619         struct sk_buff *skb;
 620         struct can_frame *cf;
 621
 622         netdev_dbg(priv->ndev, "Msg Obj is overwritten.\n");
 623         pch_can_bit_clear(&priv->regs->ifregs[0].mcont,
 624                           PCH_IF_MCONT_MSGLOST);
 625         iowrite32(PCH_CMASK_RDWR | PCH_CMASK_CTRL,
 626                   &priv->regs->ifregs[0].cmask);
 627         pch_can_rw_msg_obj(&priv->regs->ifregs[0].creq, obj_id);
 628
 629         skb = alloc_can_err_skb(ndev, &cf);
 630         if (!skb)
 631                 return;
 632
 633         cf->can_id |= CAN_ERR_CRTL;
 634         cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
 635         stats->rx_over_errors++;
 636         stats->rx_errors++;
 637
 638         netif_receive_skb(skb);
 639 }
 640
 641 static int pch_can_rx_normal(struct net_device *ndev, u32 obj_num, int quota)
 642 {
 643         u32 reg;
 644         canid_t id;
 645         int rcv_pkts = 0;
 646         struct sk_buff *skb;
 647         struct can_frame *cf;
 648         struct pch_can_priv *priv = netdev_priv(ndev);
 649         struct net_device_stats *stats = &(priv->ndev->stats);
 650         int i;
 651         u32 id2;
 652         u16 data_reg;
 653
 654         do {
 655                 /* Reading the message object from the Message RAM */
 656                 iowrite32(PCH_CMASK_RX_TX_GET, &priv->regs->ifregs[0].cmask);
 657                 pch_can_rw_msg_obj(&priv->regs->ifregs[0].creq, obj_num);
 658
 659                 /* Reading the MCONT register. */
 660                 reg = ioread32(&priv->regs->ifregs[0].mcont);
 661
 662                 if (reg & PCH_IF_MCONT_EOB)
 663                         break;
 664
 665                 /* If MsgLost bit set. */
 666                 if (reg & PCH_IF_MCONT_MSGLOST) {
 667                         pch_can_rx_msg_lost(ndev, obj_num);
 668                         rcv_pkts++;
 669                         quota--;
 670                         obj_num++;
 671                         continue;
 672                 } else if (!(reg & PCH_IF_MCONT_NEWDAT)) {
 673                         obj_num++;
 674                         continue;
 675                 }
 676
 677                 skb = alloc_can_skb(priv->ndev, &cf);
 678                 if (!skb) {
 679                         netdev_err(ndev, "alloc_can_skb Failed\n");
 680                         return rcv_pkts;
 681                 }
 682
 683                 /* Get Received data */
 684                 id2 = ioread32(&priv->regs->ifregs[0].id2);
 685                 if (id2 & PCH_ID2_XTD) {
 686                         id = (ioread32(&priv->regs->ifregs[0].id1) & 0xffff);
 687                         id |= (((id2) & 0x1fff) << 16);
 688                         cf->can_id = id | CAN_EFF_FLAG;
 689                 } else {
 690                         id = (id2 >> 2) & CAN_SFF_MASK;
 691                         cf->can_id = id;
 692                 }
 693
 694                 if (id2 & PCH_ID2_DIR)
 695                         cf->can_id |= CAN_RTR_FLAG;
 696
 697                 cf->can_dlc = get_can_dlc((ioread32(&priv->regs->
 698                                                     ifregs[0].mcont)) & 0xF);
 699
 700                 for (i = 0; i < cf->can_dlc; i += 2) {
 701                         data_reg = ioread16(&priv->regs->ifregs[0].data[i / 2]);
 702                         cf->data[i] = data_reg;
 703                         cf->data[i + 1] = data_reg >> 8;
 704                 }
 705
 706                 netif_receive_skb(skb);
 707                 rcv_pkts++;
 708                 stats->rx_packets++;
 709                 quota--;
 710                 stats->rx_bytes += cf->can_dlc;
 711
 712                 pch_fifo_thresh(priv, obj_num);
 713                 obj_num++;
 714         } while (quota > 0);
 715
 716         return rcv_pkts;
 717 }
 718
 719 static void pch_can_tx_complete(struct net_device *ndev, u32 int_stat)
 720 {
 721         struct pch_can_priv *priv = netdev_priv(ndev);
 722         struct net_device_stats *stats = &(priv->ndev->stats);
 723         u32 dlc;
 724
 725         can_get_echo_skb(ndev, int_stat - PCH_RX_OBJ_END - 1);
 726         iowrite32(PCH_CMASK_RX_TX_GET | PCH_CMASK_CLRINTPND,
 727                   &priv->regs->ifregs[1].cmask);
 728         pch_can_rw_msg_obj(&priv->regs->ifregs[1].creq, int_stat);
 729         dlc = get_can_dlc(ioread32(&priv->regs->ifregs[1].mcont) &
 730                           PCH_IF_MCONT_DLC);
 731         stats->tx_bytes += dlc;
 732         stats->tx_packets++;
 733         if (int_stat == PCH_TX_OBJ_END)
 734                 netif_wake_queue(ndev);
 735 }
 736
 737 static int pch_can_poll(struct napi_struct *napi, int quota)
 738 {
 739         struct net_device *ndev = napi->dev;
 740         struct pch_can_priv *priv = netdev_priv(ndev);
 741         u32 int_stat;
 742         u32 reg_stat;
 743         int quota_save = quota;
 744
 745         int_stat = pch_can_int_pending(priv);
 746         if (!int_stat)
 747                 goto end;
 748
 749         if (int_stat == PCH_STATUS_INT) {
 750                 reg_stat = ioread32(&priv->regs->stat);
 751
 752                 if ((reg_stat & (PCH_BUS_OFF | PCH_LEC_ALL)) &&
 753                    ((reg_stat & PCH_LEC_ALL) != PCH_LEC_ALL)) {
 754                         pch_can_error(ndev, reg_stat);
 755                         quota--;
 756                 }
 757
 758                 if (reg_stat & (PCH_TX_OK | PCH_RX_OK))
 759                         pch_can_bit_clear(&priv->regs->stat,
 760                                           reg_stat & (PCH_TX_OK | PCH_RX_OK));
 761
 762                 int_stat = pch_can_int_pending(priv);
 763         }
 764
 765         if (quota == 0)
 766                 goto end;
 767
 768         if ((int_stat >= PCH_RX_OBJ_START) && (int_stat <= PCH_RX_OBJ_END)) {
 769                 quota -= pch_can_rx_normal(ndev, int_stat, quota);
 770         } else if ((int_stat >= PCH_TX_OBJ_START) &&
 771                    (int_stat <= PCH_TX_OBJ_END)) {
 772                 /* Handle transmission interrupt */
 773                 pch_can_tx_complete(ndev, int_stat);
 774         }
 775
 776 end:
 777         napi_complete(napi);
 778         pch_can_set_int_enables(priv, PCH_CAN_ALL);
 779
 780         return quota_save - quota;
 781 }
 782
 783 static int pch_set_bittiming(struct net_device *ndev)
 784 {
 785         struct pch_can_priv *priv = netdev_priv(ndev);
 786         const struct can_bittiming *bt = &priv->can.bittiming;
 787         u32 canbit;
 788         u32 bepe;
 789
 790         /* Setting the CCE bit for accessing the Can Timing register. */
 791         pch_can_bit_set(&priv->regs->cont, PCH_CTRL_CCE);
 792
 793         canbit = (bt->brp - 1) & PCH_MSK_BITT_BRP;
 794         canbit |= (bt->sjw - 1) << PCH_BIT_SJW_SHIFT;
 795         canbit |= (bt->phase_seg1 + bt->prop_seg - 1) << PCH_BIT_TSEG1_SHIFT;
 796         canbit |= (bt->phase_seg2 - 1) << PCH_BIT_TSEG2_SHIFT;
 797         bepe = ((bt->brp - 1) & PCH_MSK_BRPE_BRPE) >> PCH_BIT_BRPE_BRPE_SHIFT;
 798         iowrite32(canbit, &priv->regs->bitt);
 799         iowrite32(bepe, &priv->regs->brpe);
 800         pch_can_bit_clear(&priv->regs->cont, PCH_CTRL_CCE);
 801
 802         return 0;
 803 }
 804
 805 static void pch_can_start(struct net_device *ndev)
 806 {
 807         struct pch_can_priv *priv = netdev_priv(ndev);
 808
 809         if (priv->can.state != CAN_STATE_STOPPED)
 810                 pch_can_reset(priv);
 811
 812         pch_set_bittiming(ndev);
 813         pch_can_set_optmode(priv);
 814
 815         pch_can_set_tx_all(priv, 1);
 816         pch_can_set_rx_all(priv, 1);
 817
 818         /* Setting the CAN to run mode. */
 819         pch_can_set_run_mode(priv, PCH_CAN_RUN);
 820
 821         priv->can.state = CAN_STATE_ERROR_ACTIVE;
 822
 823         return;
 824 }
 825
 826 static int pch_can_do_set_mode(struct net_device *ndev, enum can_mode mode)
 827 {
 828         int ret = 0;
 829
 830         switch (mode) {
 831         case CAN_MODE_START:
 832                 pch_can_start(ndev);
 833                 netif_wake_queue(ndev);
 834                 break;
 835         default:
 836                 ret = -EOPNOTSUPP;
 837                 break;
 838         }
 839
 840         return ret;
 841 }
 842
 843 static int pch_can_open(struct net_device *ndev)
 844 {
 845         struct pch_can_priv *priv = netdev_priv(ndev);
 846         int retval;
 847
 848         /* Regstering the interrupt. */
 849         retval = request_irq(priv->dev->irq, pch_can_interrupt, IRQF_SHARED,
 850                              ndev->name, ndev);
 851         if (retval) {
 852                 netdev_err(ndev, "request_irq failed.\n");
 853                 goto req_irq_err;
 854         }
 855
 856         /* Open common can device */
 857         retval = open_candev(ndev);
 858         if (retval) {
 859                 netdev_err(ndev, "open_candev() failed %d\n", retval);
 860                 goto err_open_candev;
 861         }
 862
 863         pch_can_init(priv);
 864         pch_can_start(ndev);
 865         napi_enable(&priv->napi);
 866         netif_start_queue(ndev);
 867
 868         return 0;
 869
 870 err_open_candev:
 871         free_irq(priv->dev->irq, ndev);
 872 req_irq_err:
 873         pch_can_release(priv);
 874
 875         return retval;
 876 }
 877
 878 static int pch_close(struct net_device *ndev)
 879 {
 880         struct pch_can_priv *priv = netdev_priv(ndev);
 881
 882         netif_stop_queue(ndev);
 883         napi_disable(&priv->napi);
 884         pch_can_release(priv);
 885         free_irq(priv->dev->irq, ndev);
 886         close_candev(ndev);
 887         priv->can.state = CAN_STATE_STOPPED;
 888         return 0;
 889 }
 890
 891 static netdev_tx_t pch_xmit(struct sk_buff *skb, struct net_device *ndev)
 892 {
 893         struct pch_can_priv *priv = netdev_priv(ndev);
 894         struct can_frame *cf = (struct can_frame *)skb->data;
 895         int tx_obj_no;
 896         int i;
 897         u32 id2;
 898
 899         if (can_dropped_invalid_skb(ndev, skb))
 900                 return NETDEV_TX_OK;
 901
 902         tx_obj_no = priv->tx_obj;
 903         if (priv->tx_obj == PCH_TX_OBJ_END) {
 904                 if (ioread32(&priv->regs->treq2) & PCH_TREQ2_TX_MASK)
 905                         netif_stop_queue(ndev);
 906
 907                 priv->tx_obj = PCH_TX_OBJ_START;
 908         } else {
 909                 priv->tx_obj++;
 910         }
 911
 912         /* Setting the CMASK register. */
 913         pch_can_bit_set(&priv->regs->ifregs[1].cmask, PCH_CMASK_ALL);
 914
 915         /* If ID extended is set. */
 916         if (cf->can_id & CAN_EFF_FLAG) {
 917                 iowrite32(cf->can_id & 0xffff, &priv->regs->ifregs[1].id1);
 918                 id2 = ((cf->can_id >> 16) & 0x1fff) | PCH_ID2_XTD;
 919         } else {
 920                 iowrite32(0, &priv->regs->ifregs[1].id1);
 921                 id2 = (cf->can_id & CAN_SFF_MASK) << 2;
 922         }
 923
 924         id2 |= PCH_ID_MSGVAL;
 925
 926         /* If remote frame has to be transmitted.. */
 927         if (!(cf->can_id & CAN_RTR_FLAG))
 928                 id2 |= PCH_ID2_DIR;
 929
 930         iowrite32(id2, &priv->regs->ifregs[1].id2);
 931
 932         /* Copy data to register */
 933         for (i = 0; i < cf->can_dlc; i += 2) {
 934                 iowrite16(cf->data[i] | (cf->data[i + 1] << 8),
 935                           &priv->regs->ifregs[1].data[i / 2]);
 936         }
 937
 938         can_put_echo_skb(skb, ndev, tx_obj_no - PCH_RX_OBJ_END - 1);
 939
 940         /* Set the size of the data. Update if2_mcont */
 941         iowrite32(cf->can_dlc | PCH_IF_MCONT_NEWDAT | PCH_IF_MCONT_TXRQXT |
 942                   PCH_IF_MCONT_TXIE, &priv->regs->ifregs[1].mcont);
 943
 944         pch_can_rw_msg_obj(&priv->regs->ifregs[1].creq, tx_obj_no);
 945
 946         return NETDEV_TX_OK;
 947 }
 948
 949 static const struct net_device_ops pch_can_netdev_ops = {
 950         .ndo_open               = pch_can_open,
 951         .ndo_stop               = pch_close,
 952         .ndo_start_xmit         = pch_xmit,
 953         .ndo_change_mtu         = can_change_mtu,
 954 };
 955
 956 static void pch_can_remove(struct pci_dev *pdev)
 957 {
 958         struct net_device *ndev = pci_get_drvdata(pdev);
 959         struct pch_can_priv *priv = netdev_priv(ndev);
 960
 961         unregister_candev(priv->ndev);
 962         if (priv->use_msi)
 963                 pci_disable_msi(priv->dev);
 964         pci_release_regions(pdev);
 965         pci_disable_device(pdev);
 966         pch_can_reset(priv);
 967         pci_iounmap(pdev, priv->regs);
 968         free_candev(priv->ndev);
 969 }
 970
 971 #ifdef CONFIG_PM
 972 static void pch_can_set_int_custom(struct pch_can_priv *priv)
 973 {
 974         /* Clearing the IE, SIE and EIE bits of Can control register. */
 975         pch_can_bit_clear(&priv->regs->cont, PCH_CTRL_IE_SIE_EIE);
 976
 977         /* Appropriately setting them. */
 978         pch_can_bit_set(&priv->regs->cont,
 979                         ((priv->int_enables & PCH_MSK_CTRL_IE_SIE_EIE) << 1));
 980 }
 981
 982 /* This function retrieves interrupt enabled for the CAN device. */
 983 static u32 pch_can_get_int_enables(struct pch_can_priv *priv)
 984 {
 985         /* Obtaining the status of IE, SIE and EIE interrupt bits. */
 986         return (ioread32(&priv->regs->cont) & PCH_CTRL_IE_SIE_EIE) >> 1;
 987 }
 988
 989 static u32 pch_can_get_rxtx_ir(struct pch_can_priv *priv, u32 buff_num,
 990                                enum pch_ifreg dir)
 991 {
 992         u32 ie, enable;
 993
 994         if (dir)
 995                 ie = PCH_IF_MCONT_RXIE;
 996         else
 997                 ie = PCH_IF_MCONT_TXIE;
 998
 999         iowrite32(PCH_CMASK_RX_TX_GET, &priv->regs->ifregs[dir].cmask);
1000         pch_can_rw_msg_obj(&priv->regs->ifregs[dir].creq, buff_num);
1001
1002         if (((ioread32(&priv->regs->ifregs[dir].id2)) & PCH_ID_MSGVAL) &&
1003                         ((ioread32(&priv->regs->ifregs[dir].mcont)) & ie))
1004                 enable = 1;
1005         else
1006                 enable = 0;
1007
1008         return enable;
1009 }
1010
1011 static void pch_can_set_rx_buffer_link(struct pch_can_priv *priv,
1012                                        u32 buffer_num, int set)
1013 {
1014         iowrite32(PCH_CMASK_RX_TX_GET, &priv->regs->ifregs[0].cmask);
1015         pch_can_rw_msg_obj(&priv->regs->ifregs[0].creq, buffer_num);
1016         iowrite32(PCH_CMASK_RDWR | PCH_CMASK_CTRL,
1017                   &priv->regs->ifregs[0].cmask);
1018         if (set)
1019                 pch_can_bit_clear(&priv->regs->ifregs[0].mcont,
1020                                   PCH_IF_MCONT_EOB);
1021         else
1022                 pch_can_bit_set(&priv->regs->ifregs[0].mcont, PCH_IF_MCONT_EOB);
1023
1024         pch_can_rw_msg_obj(&priv->regs->ifregs[0].creq, buffer_num);
1025 }
1026
1027 static u32 pch_can_get_rx_buffer_link(struct pch_can_priv *priv, u32 buffer_num)
1028 {
1029         u32 link;
1030
1031         iowrite32(PCH_CMASK_RX_TX_GET, &priv->regs->ifregs[0].cmask);
1032         pch_can_rw_msg_obj(&priv->regs->ifregs[0].creq, buffer_num);
1033
1034         if (ioread32(&priv->regs->ifregs[0].mcont) & PCH_IF_MCONT_EOB)
1035                 link = 0;
1036         else
1037                 link = 1;
1038         return link;
1039 }
1040
1041 static int pch_can_get_buffer_status(struct pch_can_priv *priv)
1042 {
1043         return (ioread32(&priv->regs->treq1) & 0xffff) |
1044                (ioread32(&priv->regs->treq2) << 16);
1045 }
1046
1047 static int pch_can_suspend(struct pci_dev *pdev, pm_message_t state)
1048 {
1049         int i;
1050         int retval;
1051         u32 buf_stat;   /* Variable for reading the transmit buffer status. */
1052         int counter = PCH_COUNTER_LIMIT;
1053
1054         struct net_device *dev = pci_get_drvdata(pdev);
1055         struct pch_can_priv *priv = netdev_priv(dev);
1056
1057         /* Stop the CAN controller */
1058         pch_can_set_run_mode(priv, PCH_CAN_STOP);
1059
1060         /* Indicate that we are aboutto/in suspend */
1061         priv->can.state = CAN_STATE_STOPPED;
1062
1063         /* Waiting for all transmission to complete. */
1064         while (counter) {
1065                 buf_stat = pch_can_get_buffer_status(priv);
1066                 if (!buf_stat)
1067                         break;
1068                 counter--;
1069                 udelay(1);
1070         }
1071         if (!counter)
1072                 dev_err(&pdev->dev, "%s -> Transmission time out.\n", __func__);
1073
1074         /* Save interrupt configuration and then disable them */
1075         priv->int_enables = pch_can_get_int_enables(priv);
1076         pch_can_set_int_enables(priv, PCH_CAN_DISABLE);
1077
1078         /* Save Tx buffer enable state */
1079         for (i = PCH_TX_OBJ_START; i <= PCH_TX_OBJ_END; i++)
1080                 priv->tx_enable[i - 1] = pch_can_get_rxtx_ir(priv, i,
1081                                                              PCH_TX_IFREG);
1082
1083         /* Disable all Transmit buffers */
1084         pch_can_set_tx_all(priv, 0);
1085
1086         /* Save Rx buffer enable state */
1087         for (i = PCH_RX_OBJ_START; i <= PCH_RX_OBJ_END; i++) {
1088                 priv->rx_enable[i - 1] = pch_can_get_rxtx_ir(priv, i,
1089                                                              PCH_RX_IFREG);
1090                 priv->rx_link[i - 1] = pch_can_get_rx_buffer_link(priv, i);
1091         }
1092
1093         /* Disable all Receive buffers */
1094         pch_can_set_rx_all(priv, 0);
1095         retval = pci_save_state(pdev);
1096         if (retval) {
1097                 dev_err(&pdev->dev, "pci_save_state failed.\n");
1098         } else {
1099                 pci_enable_wake(pdev, PCI_D3hot, 0);
1100                 pci_disable_device(pdev);
1101                 pci_set_power_state(pdev, pci_choose_state(pdev, state));
1102         }
1103
1104         return retval;
1105 }
1106
1107 static int pch_can_resume(struct pci_dev *pdev)
1108 {
1109         int i;
1110         int retval;
1111         struct net_device *dev = pci_get_drvdata(pdev);
1112         struct pch_can_priv *priv = netdev_priv(dev);
1113
1114         pci_set_power_state(pdev, PCI_D0);
1115         pci_restore_state(pdev);
1116         retval = pci_enable_device(pdev);
1117         if (retval) {
1118                 dev_err(&pdev->dev, "pci_enable_device failed.\n");
1119                 return retval;
1120         }
1121
1122         pci_enable_wake(pdev, PCI_D3hot, 0);
1123
1124         priv->can.state = CAN_STATE_ERROR_ACTIVE;
1125
1126         /* Disabling all interrupts. */
1127         pch_can_set_int_enables(priv, PCH_CAN_DISABLE);
1128
1129         /* Setting the CAN device in Stop Mode. */
1130         pch_can_set_run_mode(priv, PCH_CAN_STOP);
1131
1132         /* Configuring the transmit and receive buffers. */
1133         pch_can_config_rx_tx_buffers(priv);
1134
1135         /* Restore the CAN state */
1136         pch_set_bittiming(dev);
1137
1138         /* Listen/Active */
1139         pch_can_set_optmode(priv);
1140
1141         /* Enabling the transmit buffer. */
1142         for (i = PCH_TX_OBJ_START; i <= PCH_TX_OBJ_END; i++)
1143                 pch_can_set_rxtx(priv, i, priv->tx_enable[i - 1], PCH_TX_IFREG);
1144
1145         /* Configuring the receive buffer and enabling them. */
1146         for (i = PCH_RX_OBJ_START; i <= PCH_RX_OBJ_END; i++) {
1147                 /* Restore buffer link */
1148                 pch_can_set_rx_buffer_link(priv, i, priv->rx_link[i - 1]);
1149
1150                 /* Restore buffer enables */
1151                 pch_can_set_rxtx(priv, i, priv->rx_enable[i - 1], PCH_RX_IFREG);
1152         }
1153
1154         /* Enable CAN Interrupts */
1155         pch_can_set_int_custom(priv);
1156
1157         /* Restore Run Mode */
1158         pch_can_set_run_mode(priv, PCH_CAN_RUN);
1159
1160         return retval;
1161 }
1162 #else
1163 #define pch_can_suspend NULL
1164 #define pch_can_resume NULL
1165 #endif
1166
1167 static int pch_can_get_berr_counter(const struct net_device *dev,
1168                                     struct can_berr_counter *bec)
1169 {
1170         struct pch_can_priv *priv = netdev_priv(dev);
1171         u32 errc = ioread32(&priv->regs->errc);
1172
1173         bec->txerr = errc & PCH_TEC;
1174         bec->rxerr = (errc & PCH_REC) >> 8;
1175
1176         return 0;
1177 }
1178
1179 static int pch_can_probe(struct pci_dev *pdev,
1180                                    const struct pci_device_id *id)
1181 {
1182         struct net_device *ndev;
1183         struct pch_can_priv *priv;
1184         int rc;
1185         void __iomem *addr;
1186
1187         rc = pci_enable_device(pdev);
1188         if (rc) {
1189                 dev_err(&pdev->dev, "Failed pci_enable_device %d\n", rc);
1190                 goto probe_exit_endev;
1191         }
1192
1193         rc = pci_request_regions(pdev, KBUILD_MODNAME);
1194         if (rc) {
1195                 dev_err(&pdev->dev, "Failed pci_request_regions %d\n", rc);
1196                 goto probe_exit_pcireq;
1197         }
1198
1199         addr = pci_iomap(pdev, 1, 0);
1200         if (!addr) {
1201                 rc = -EIO;
1202                 dev_err(&pdev->dev, "Failed pci_iomap\n");
1203                 goto probe_exit_ipmap;
1204         }
1205
1206         ndev = alloc_candev(sizeof(struct pch_can_priv), PCH_TX_OBJ_END);
1207         if (!ndev) {
1208                 rc = -ENOMEM;
1209                 dev_err(&pdev->dev, "Failed alloc_candev\n");
1210                 goto probe_exit_alloc_candev;
1211         }
1212
1213         priv = netdev_priv(ndev);
1214         priv->ndev = ndev;
1215         priv->regs = addr;
1216         priv->dev = pdev;
1217         priv->can.bittiming_const = &pch_can_bittiming_const;
1218         priv->can.do_set_mode = pch_can_do_set_mode;
1219         priv->can.do_get_berr_counter = pch_can_get_berr_counter;
1220         priv->can.ctrlmode_supported = CAN_CTRLMODE_LISTENONLY |
1221                                        CAN_CTRLMODE_LOOPBACK;
1222         priv->tx_obj = PCH_TX_OBJ_START; /* Point head of Tx Obj */
1223
1224         ndev->irq = pdev->irq;
1225         ndev->flags |= IFF_ECHO;
1226
1227         pci_set_drvdata(pdev, ndev);
1228         SET_NETDEV_DEV(ndev, &pdev->dev);
1229         ndev->netdev_ops = &pch_can_netdev_ops;
1230         priv->can.clock.freq = PCH_CAN_CLK; /* Hz */
1231
1232         netif_napi_add(ndev, &priv->napi, pch_can_poll, PCH_RX_OBJ_END);
1233
1234         rc = pci_enable_msi(priv->dev);
1235         if (rc) {
1236                 netdev_err(ndev, "PCH CAN opened without MSI\n");
1237                 priv->use_msi = 0;
1238         } else {
1239                 netdev_err(ndev, "PCH CAN opened with MSI\n");
1240                 pci_set_master(pdev);
1241                 priv->use_msi = 1;
1242         }
1243
1244         rc = register_candev(ndev);
1245         if (rc) {
1246                 dev_err(&pdev->dev, "Failed register_candev %d\n", rc);
1247                 goto probe_exit_reg_candev;
1248         }
1249
1250         return 0;
1251
1252 probe_exit_reg_candev:
1253         if (priv->use_msi)
1254                 pci_disable_msi(priv->dev);
1255         free_candev(ndev);
1256 probe_exit_alloc_candev:
1257         pci_iounmap(pdev, addr);
1258 probe_exit_ipmap:
1259         pci_release_regions(pdev);
1260 probe_exit_pcireq:
1261         pci_disable_device(pdev);
1262 probe_exit_endev:
1263         return rc;
1264 }
1265
1266 static struct pci_driver pch_can_pci_driver = {
1267         .name = "pch_can",
1268         .id_table = pch_pci_tbl,
1269         .probe = pch_can_probe,
1270         .remove = pch_can_remove,
1271         .suspend = pch_can_suspend,
1272         .resume = pch_can_resume,
1273 };
1274
1275 module_pci_driver(pch_can_pci_driver);
1276
1277 MODULE_DESCRIPTION("Intel EG20T PCH CAN(Controller Area Network) Driver");
1278 MODULE_LICENSE("GPL v2");
1279 MODULE_VERSION("0.94");