Version:  2.0.40 2.2.26 2.4.37 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16

Linux/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 DEFINE_PCI_DEVICE_TABLE(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                 can_bus_off(ndev);
509         }
510 
511         errc = ioread32(&priv->regs->errc);
512         /* Warning interrupt. */
513         if (status & PCH_EWARN) {
514                 state = CAN_STATE_ERROR_WARNING;
515                 priv->can.can_stats.error_warning++;
516                 cf->can_id |= CAN_ERR_CRTL;
517                 if (((errc & PCH_REC) >> 8) > 96)
518                         cf->data[1] |= CAN_ERR_CRTL_RX_WARNING;
519                 if ((errc & PCH_TEC) > 96)
520                         cf->data[1] |= CAN_ERR_CRTL_TX_WARNING;
521                 netdev_dbg(ndev,
522                         "%s -> Error Counter is more than 96.\n", __func__);
523         }
524         /* Error passive interrupt. */
525         if (status & PCH_EPASSIV) {
526                 priv->can.can_stats.error_passive++;
527                 state = CAN_STATE_ERROR_PASSIVE;
528                 cf->can_id |= CAN_ERR_CRTL;
529                 if (errc & PCH_RP)
530                         cf->data[1] |= CAN_ERR_CRTL_RX_PASSIVE;
531                 if ((errc & PCH_TEC) > 127)
532                         cf->data[1] |= CAN_ERR_CRTL_TX_PASSIVE;
533                 netdev_dbg(ndev,
534                         "%s -> CAN controller is ERROR PASSIVE .\n", __func__);
535         }
536 
537         lec = status & PCH_LEC_ALL;
538         switch (lec) {
539         case PCH_STUF_ERR:
540                 cf->data[2] |= CAN_ERR_PROT_STUFF;
541                 priv->can.can_stats.bus_error++;
542                 stats->rx_errors++;
543                 break;
544         case PCH_FORM_ERR:
545                 cf->data[2] |= CAN_ERR_PROT_FORM;
546                 priv->can.can_stats.bus_error++;
547                 stats->rx_errors++;
548                 break;
549         case PCH_ACK_ERR:
550                 cf->can_id |= CAN_ERR_ACK;
551                 priv->can.can_stats.bus_error++;
552                 stats->rx_errors++;
553                 break;
554         case PCH_BIT1_ERR:
555         case PCH_BIT0_ERR:
556                 cf->data[2] |= CAN_ERR_PROT_BIT;
557                 priv->can.can_stats.bus_error++;
558                 stats->rx_errors++;
559                 break;
560         case PCH_CRC_ERR:
561                 cf->data[3] |= CAN_ERR_PROT_LOC_CRC_SEQ |
562                                CAN_ERR_PROT_LOC_CRC_DEL;
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");
1280 

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