Back to home page

OSCL-LXR
 
 

     

0001 /*
0002  * sja1000.c -  Philips SJA1000 network device driver
0003  *
0004  * Copyright (c) 2003 Matthias Brukner, Trajet Gmbh, Rebenring 33,
0005  * 38106 Braunschweig, GERMANY
0006  *
0007  * Copyright (c) 2002-2007 Volkswagen Group Electronic Research
0008  * All rights reserved.
0009  *
0010  * Redistribution and use in source and binary forms, with or without
0011  * modification, are permitted provided that the following conditions
0012  * are met:
0013  * 1. Redistributions of source code must retain the above copyright
0014  *    notice, this list of conditions and the following disclaimer.
0015  * 2. Redistributions in binary form must reproduce the above copyright
0016  *    notice, this list of conditions and the following disclaimer in the
0017  *    documentation and/or other materials provided with the distribution.
0018  * 3. Neither the name of Volkswagen nor the names of its contributors
0019  *    may be used to endorse or promote products derived from this software
0020  *    without specific prior written permission.
0021  *
0022  * Alternatively, provided that this notice is retained in full, this
0023  * software may be distributed under the terms of the GNU General
0024  * Public License ("GPL") version 2, in which case the provisions of the
0025  * GPL apply INSTEAD OF those given above.
0026  *
0027  * The provided data structures and external interfaces from this code
0028  * are not restricted to be used by modules with a GPL compatible license.
0029  *
0030  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
0031  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
0032  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
0033  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
0034  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
0035  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
0036  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
0037  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
0038  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
0039  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
0040  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
0041  * DAMAGE.
0042  *
0043  */
0044 
0045 #include <linux/module.h>
0046 #include <linux/init.h>
0047 #include <linux/kernel.h>
0048 #include <linux/sched.h>
0049 #include <linux/types.h>
0050 #include <linux/fcntl.h>
0051 #include <linux/interrupt.h>
0052 #include <linux/ptrace.h>
0053 #include <linux/string.h>
0054 #include <linux/errno.h>
0055 #include <linux/ethtool.h>
0056 #include <linux/netdevice.h>
0057 #include <linux/if_arp.h>
0058 #include <linux/if_ether.h>
0059 #include <linux/skbuff.h>
0060 #include <linux/delay.h>
0061 
0062 #include <linux/can/dev.h>
0063 #include <linux/can/error.h>
0064 
0065 #include "sja1000.h"
0066 
0067 #define DRV_NAME "sja1000"
0068 
0069 MODULE_AUTHOR("Oliver Hartkopp <oliver.hartkopp@volkswagen.de>");
0070 MODULE_LICENSE("Dual BSD/GPL");
0071 MODULE_DESCRIPTION(DRV_NAME "CAN netdevice driver");
0072 
0073 static const struct can_bittiming_const sja1000_bittiming_const = {
0074     .name = DRV_NAME,
0075     .tseg1_min = 1,
0076     .tseg1_max = 16,
0077     .tseg2_min = 1,
0078     .tseg2_max = 8,
0079     .sjw_max = 4,
0080     .brp_min = 1,
0081     .brp_max = 64,
0082     .brp_inc = 1,
0083 };
0084 
0085 static void sja1000_write_cmdreg(struct sja1000_priv *priv, u8 val)
0086 {
0087     unsigned long flags;
0088 
0089     /*
0090      * The command register needs some locking and time to settle
0091      * the write_reg() operation - especially on SMP systems.
0092      */
0093     spin_lock_irqsave(&priv->cmdreg_lock, flags);
0094     priv->write_reg(priv, SJA1000_CMR, val);
0095     priv->read_reg(priv, SJA1000_SR);
0096     spin_unlock_irqrestore(&priv->cmdreg_lock, flags);
0097 }
0098 
0099 static int sja1000_is_absent(struct sja1000_priv *priv)
0100 {
0101     return (priv->read_reg(priv, SJA1000_MOD) == 0xFF);
0102 }
0103 
0104 static int sja1000_probe_chip(struct net_device *dev)
0105 {
0106     struct sja1000_priv *priv = netdev_priv(dev);
0107 
0108     if (priv->reg_base && sja1000_is_absent(priv)) {
0109         netdev_err(dev, "probing failed\n");
0110         return 0;
0111     }
0112     return -1;
0113 }
0114 
0115 static void set_reset_mode(struct net_device *dev)
0116 {
0117     struct sja1000_priv *priv = netdev_priv(dev);
0118     unsigned char status = priv->read_reg(priv, SJA1000_MOD);
0119     int i;
0120 
0121     /* disable interrupts */
0122     priv->write_reg(priv, SJA1000_IER, IRQ_OFF);
0123 
0124     for (i = 0; i < 100; i++) {
0125         /* check reset bit */
0126         if (status & MOD_RM) {
0127             priv->can.state = CAN_STATE_STOPPED;
0128             return;
0129         }
0130 
0131         /* reset chip */
0132         priv->write_reg(priv, SJA1000_MOD, MOD_RM);
0133         udelay(10);
0134         status = priv->read_reg(priv, SJA1000_MOD);
0135     }
0136 
0137     netdev_err(dev, "setting SJA1000 into reset mode failed!\n");
0138 }
0139 
0140 static void set_normal_mode(struct net_device *dev)
0141 {
0142     struct sja1000_priv *priv = netdev_priv(dev);
0143     unsigned char status = priv->read_reg(priv, SJA1000_MOD);
0144     u8 mod_reg_val = 0x00;
0145     int i;
0146 
0147     for (i = 0; i < 100; i++) {
0148         /* check reset bit */
0149         if ((status & MOD_RM) == 0) {
0150             priv->can.state = CAN_STATE_ERROR_ACTIVE;
0151             /* enable interrupts */
0152             if (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)
0153                 priv->write_reg(priv, SJA1000_IER, IRQ_ALL);
0154             else
0155                 priv->write_reg(priv, SJA1000_IER,
0156                         IRQ_ALL & ~IRQ_BEI);
0157             return;
0158         }
0159 
0160         /* set chip to normal mode */
0161         if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
0162             mod_reg_val |= MOD_LOM;
0163         if (priv->can.ctrlmode & CAN_CTRLMODE_PRESUME_ACK)
0164             mod_reg_val |= MOD_STM;
0165         priv->write_reg(priv, SJA1000_MOD, mod_reg_val);
0166 
0167         udelay(10);
0168 
0169         status = priv->read_reg(priv, SJA1000_MOD);
0170     }
0171 
0172     netdev_err(dev, "setting SJA1000 into normal mode failed!\n");
0173 }
0174 
0175 /*
0176  * initialize SJA1000 chip:
0177  *   - reset chip
0178  *   - set output mode
0179  *   - set baudrate
0180  *   - enable interrupts
0181  *   - start operating mode
0182  */
0183 static void chipset_init(struct net_device *dev)
0184 {
0185     struct sja1000_priv *priv = netdev_priv(dev);
0186 
0187     if (!(priv->flags & SJA1000_QUIRK_NO_CDR_REG))
0188         /* set clock divider and output control register */
0189         priv->write_reg(priv, SJA1000_CDR, priv->cdr | CDR_PELICAN);
0190 
0191     /* set acceptance filter (accept all) */
0192     priv->write_reg(priv, SJA1000_ACCC0, 0x00);
0193     priv->write_reg(priv, SJA1000_ACCC1, 0x00);
0194     priv->write_reg(priv, SJA1000_ACCC2, 0x00);
0195     priv->write_reg(priv, SJA1000_ACCC3, 0x00);
0196 
0197     priv->write_reg(priv, SJA1000_ACCM0, 0xFF);
0198     priv->write_reg(priv, SJA1000_ACCM1, 0xFF);
0199     priv->write_reg(priv, SJA1000_ACCM2, 0xFF);
0200     priv->write_reg(priv, SJA1000_ACCM3, 0xFF);
0201 
0202     priv->write_reg(priv, SJA1000_OCR, priv->ocr | OCR_MODE_NORMAL);
0203 }
0204 
0205 static void sja1000_start(struct net_device *dev)
0206 {
0207     struct sja1000_priv *priv = netdev_priv(dev);
0208 
0209     /* leave reset mode */
0210     if (priv->can.state != CAN_STATE_STOPPED)
0211         set_reset_mode(dev);
0212 
0213     /* Initialize chip if uninitialized at this stage */
0214     if (!(priv->flags & SJA1000_QUIRK_NO_CDR_REG ||
0215           priv->read_reg(priv, SJA1000_CDR) & CDR_PELICAN))
0216         chipset_init(dev);
0217 
0218     /* Clear error counters and error code capture */
0219     priv->write_reg(priv, SJA1000_TXERR, 0x0);
0220     priv->write_reg(priv, SJA1000_RXERR, 0x0);
0221     priv->read_reg(priv, SJA1000_ECC);
0222 
0223     /* clear interrupt flags */
0224     priv->read_reg(priv, SJA1000_IR);
0225 
0226     /* leave reset mode */
0227     set_normal_mode(dev);
0228 }
0229 
0230 static int sja1000_set_mode(struct net_device *dev, enum can_mode mode)
0231 {
0232     switch (mode) {
0233     case CAN_MODE_START:
0234         sja1000_start(dev);
0235         if (netif_queue_stopped(dev))
0236             netif_wake_queue(dev);
0237         break;
0238 
0239     default:
0240         return -EOPNOTSUPP;
0241     }
0242 
0243     return 0;
0244 }
0245 
0246 static int sja1000_set_bittiming(struct net_device *dev)
0247 {
0248     struct sja1000_priv *priv = netdev_priv(dev);
0249     struct can_bittiming *bt = &priv->can.bittiming;
0250     u8 btr0, btr1;
0251 
0252     btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6);
0253     btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) |
0254         (((bt->phase_seg2 - 1) & 0x7) << 4);
0255     if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
0256         btr1 |= 0x80;
0257 
0258     netdev_info(dev, "setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1);
0259 
0260     priv->write_reg(priv, SJA1000_BTR0, btr0);
0261     priv->write_reg(priv, SJA1000_BTR1, btr1);
0262 
0263     return 0;
0264 }
0265 
0266 static int sja1000_get_berr_counter(const struct net_device *dev,
0267                     struct can_berr_counter *bec)
0268 {
0269     struct sja1000_priv *priv = netdev_priv(dev);
0270 
0271     bec->txerr = priv->read_reg(priv, SJA1000_TXERR);
0272     bec->rxerr = priv->read_reg(priv, SJA1000_RXERR);
0273 
0274     return 0;
0275 }
0276 
0277 /*
0278  * transmit a CAN message
0279  * message layout in the sk_buff should be like this:
0280  * xx xx xx xx   ff  ll   00 11 22 33 44 55 66 77
0281  * [  can-id ] [flags] [len] [can data (up to 8 bytes]
0282  */
0283 static netdev_tx_t sja1000_start_xmit(struct sk_buff *skb,
0284                         struct net_device *dev)
0285 {
0286     struct sja1000_priv *priv = netdev_priv(dev);
0287     struct can_frame *cf = (struct can_frame *)skb->data;
0288     uint8_t fi;
0289     canid_t id;
0290     uint8_t dreg;
0291     u8 cmd_reg_val = 0x00;
0292     int i;
0293 
0294     if (can_dropped_invalid_skb(dev, skb))
0295         return NETDEV_TX_OK;
0296 
0297     netif_stop_queue(dev);
0298 
0299     fi = can_get_cc_dlc(cf, priv->can.ctrlmode);
0300     id = cf->can_id;
0301 
0302     if (id & CAN_RTR_FLAG)
0303         fi |= SJA1000_FI_RTR;
0304 
0305     if (id & CAN_EFF_FLAG) {
0306         fi |= SJA1000_FI_FF;
0307         dreg = SJA1000_EFF_BUF;
0308         priv->write_reg(priv, SJA1000_FI, fi);
0309         priv->write_reg(priv, SJA1000_ID1, (id & 0x1fe00000) >> 21);
0310         priv->write_reg(priv, SJA1000_ID2, (id & 0x001fe000) >> 13);
0311         priv->write_reg(priv, SJA1000_ID3, (id & 0x00001fe0) >> 5);
0312         priv->write_reg(priv, SJA1000_ID4, (id & 0x0000001f) << 3);
0313     } else {
0314         dreg = SJA1000_SFF_BUF;
0315         priv->write_reg(priv, SJA1000_FI, fi);
0316         priv->write_reg(priv, SJA1000_ID1, (id & 0x000007f8) >> 3);
0317         priv->write_reg(priv, SJA1000_ID2, (id & 0x00000007) << 5);
0318     }
0319 
0320     for (i = 0; i < cf->len; i++)
0321         priv->write_reg(priv, dreg++, cf->data[i]);
0322 
0323     can_put_echo_skb(skb, dev, 0, 0);
0324 
0325     if (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT)
0326         cmd_reg_val |= CMD_AT;
0327 
0328     if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK)
0329         cmd_reg_val |= CMD_SRR;
0330     else
0331         cmd_reg_val |= CMD_TR;
0332 
0333     sja1000_write_cmdreg(priv, cmd_reg_val);
0334 
0335     return NETDEV_TX_OK;
0336 }
0337 
0338 static void sja1000_rx(struct net_device *dev)
0339 {
0340     struct sja1000_priv *priv = netdev_priv(dev);
0341     struct net_device_stats *stats = &dev->stats;
0342     struct can_frame *cf;
0343     struct sk_buff *skb;
0344     uint8_t fi;
0345     uint8_t dreg;
0346     canid_t id;
0347     int i;
0348 
0349     /* create zero'ed CAN frame buffer */
0350     skb = alloc_can_skb(dev, &cf);
0351     if (skb == NULL)
0352         return;
0353 
0354     fi = priv->read_reg(priv, SJA1000_FI);
0355 
0356     if (fi & SJA1000_FI_FF) {
0357         /* extended frame format (EFF) */
0358         dreg = SJA1000_EFF_BUF;
0359         id = (priv->read_reg(priv, SJA1000_ID1) << 21)
0360             | (priv->read_reg(priv, SJA1000_ID2) << 13)
0361             | (priv->read_reg(priv, SJA1000_ID3) << 5)
0362             | (priv->read_reg(priv, SJA1000_ID4) >> 3);
0363         id |= CAN_EFF_FLAG;
0364     } else {
0365         /* standard frame format (SFF) */
0366         dreg = SJA1000_SFF_BUF;
0367         id = (priv->read_reg(priv, SJA1000_ID1) << 3)
0368             | (priv->read_reg(priv, SJA1000_ID2) >> 5);
0369     }
0370 
0371     can_frame_set_cc_len(cf, fi & 0x0F, priv->can.ctrlmode);
0372     if (fi & SJA1000_FI_RTR) {
0373         id |= CAN_RTR_FLAG;
0374     } else {
0375         for (i = 0; i < cf->len; i++)
0376             cf->data[i] = priv->read_reg(priv, dreg++);
0377 
0378         stats->rx_bytes += cf->len;
0379     }
0380     stats->rx_packets++;
0381 
0382     cf->can_id = id;
0383 
0384     /* release receive buffer */
0385     sja1000_write_cmdreg(priv, CMD_RRB);
0386 
0387     netif_rx(skb);
0388 }
0389 
0390 static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status)
0391 {
0392     struct sja1000_priv *priv = netdev_priv(dev);
0393     struct net_device_stats *stats = &dev->stats;
0394     struct can_frame *cf;
0395     struct sk_buff *skb;
0396     enum can_state state = priv->can.state;
0397     enum can_state rx_state, tx_state;
0398     unsigned int rxerr, txerr;
0399     uint8_t ecc, alc;
0400 
0401     skb = alloc_can_err_skb(dev, &cf);
0402     if (skb == NULL)
0403         return -ENOMEM;
0404 
0405     txerr = priv->read_reg(priv, SJA1000_TXERR);
0406     rxerr = priv->read_reg(priv, SJA1000_RXERR);
0407 
0408     if (isrc & IRQ_DOI) {
0409         /* data overrun interrupt */
0410         netdev_dbg(dev, "data overrun interrupt\n");
0411         cf->can_id |= CAN_ERR_CRTL;
0412         cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
0413         stats->rx_over_errors++;
0414         stats->rx_errors++;
0415         sja1000_write_cmdreg(priv, CMD_CDO);    /* clear bit */
0416     }
0417 
0418     if (isrc & IRQ_EI) {
0419         /* error warning interrupt */
0420         netdev_dbg(dev, "error warning interrupt\n");
0421 
0422         if (status & SR_BS)
0423             state = CAN_STATE_BUS_OFF;
0424         else if (status & SR_ES)
0425             state = CAN_STATE_ERROR_WARNING;
0426         else
0427             state = CAN_STATE_ERROR_ACTIVE;
0428     }
0429     if (state != CAN_STATE_BUS_OFF) {
0430         cf->can_id |= CAN_ERR_CNT;
0431         cf->data[6] = txerr;
0432         cf->data[7] = rxerr;
0433     }
0434     if (isrc & IRQ_BEI) {
0435         /* bus error interrupt */
0436         priv->can.can_stats.bus_error++;
0437         stats->rx_errors++;
0438 
0439         ecc = priv->read_reg(priv, SJA1000_ECC);
0440 
0441         cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
0442 
0443         /* set error type */
0444         switch (ecc & ECC_MASK) {
0445         case ECC_BIT:
0446             cf->data[2] |= CAN_ERR_PROT_BIT;
0447             break;
0448         case ECC_FORM:
0449             cf->data[2] |= CAN_ERR_PROT_FORM;
0450             break;
0451         case ECC_STUFF:
0452             cf->data[2] |= CAN_ERR_PROT_STUFF;
0453             break;
0454         default:
0455             break;
0456         }
0457 
0458         /* set error location */
0459         cf->data[3] = ecc & ECC_SEG;
0460 
0461         /* Error occurred during transmission? */
0462         if ((ecc & ECC_DIR) == 0)
0463             cf->data[2] |= CAN_ERR_PROT_TX;
0464     }
0465     if (isrc & IRQ_EPI) {
0466         /* error passive interrupt */
0467         netdev_dbg(dev, "error passive interrupt\n");
0468 
0469         if (state == CAN_STATE_ERROR_PASSIVE)
0470             state = CAN_STATE_ERROR_WARNING;
0471         else
0472             state = CAN_STATE_ERROR_PASSIVE;
0473     }
0474     if (isrc & IRQ_ALI) {
0475         /* arbitration lost interrupt */
0476         netdev_dbg(dev, "arbitration lost interrupt\n");
0477         alc = priv->read_reg(priv, SJA1000_ALC);
0478         priv->can.can_stats.arbitration_lost++;
0479         cf->can_id |= CAN_ERR_LOSTARB;
0480         cf->data[0] = alc & 0x1f;
0481     }
0482 
0483     if (state != priv->can.state) {
0484         tx_state = txerr >= rxerr ? state : 0;
0485         rx_state = txerr <= rxerr ? state : 0;
0486 
0487         can_change_state(dev, cf, tx_state, rx_state);
0488 
0489         if(state == CAN_STATE_BUS_OFF)
0490             can_bus_off(dev);
0491     }
0492 
0493     netif_rx(skb);
0494 
0495     return 0;
0496 }
0497 
0498 irqreturn_t sja1000_interrupt(int irq, void *dev_id)
0499 {
0500     struct net_device *dev = (struct net_device *)dev_id;
0501     struct sja1000_priv *priv = netdev_priv(dev);
0502     struct net_device_stats *stats = &dev->stats;
0503     uint8_t isrc, status;
0504     int n = 0;
0505 
0506     if (priv->pre_irq)
0507         priv->pre_irq(priv);
0508 
0509     /* Shared interrupts and IRQ off? */
0510     if (priv->read_reg(priv, SJA1000_IER) == IRQ_OFF)
0511         goto out;
0512 
0513     while ((isrc = priv->read_reg(priv, SJA1000_IR)) &&
0514            (n < SJA1000_MAX_IRQ)) {
0515 
0516         status = priv->read_reg(priv, SJA1000_SR);
0517         /* check for absent controller due to hw unplug */
0518         if (status == 0xFF && sja1000_is_absent(priv))
0519             goto out;
0520 
0521         if (isrc & IRQ_WUI)
0522             netdev_warn(dev, "wakeup interrupt\n");
0523 
0524         if (isrc & IRQ_TI) {
0525             /* transmission buffer released */
0526             if (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT &&
0527                 !(status & SR_TCS)) {
0528                 stats->tx_errors++;
0529                 can_free_echo_skb(dev, 0, NULL);
0530             } else {
0531                 /* transmission complete */
0532                 stats->tx_bytes += can_get_echo_skb(dev, 0, NULL);
0533                 stats->tx_packets++;
0534             }
0535             netif_wake_queue(dev);
0536         }
0537         if (isrc & IRQ_RI) {
0538             /* receive interrupt */
0539             while (status & SR_RBS) {
0540                 sja1000_rx(dev);
0541                 status = priv->read_reg(priv, SJA1000_SR);
0542                 /* check for absent controller */
0543                 if (status == 0xFF && sja1000_is_absent(priv))
0544                     goto out;
0545             }
0546         }
0547         if (isrc & (IRQ_DOI | IRQ_EI | IRQ_BEI | IRQ_EPI | IRQ_ALI)) {
0548             /* error interrupt */
0549             if (sja1000_err(dev, isrc, status))
0550                 break;
0551         }
0552         n++;
0553     }
0554 out:
0555     if (priv->post_irq)
0556         priv->post_irq(priv);
0557 
0558     if (n >= SJA1000_MAX_IRQ)
0559         netdev_dbg(dev, "%d messages handled in ISR", n);
0560 
0561     return (n) ? IRQ_HANDLED : IRQ_NONE;
0562 }
0563 EXPORT_SYMBOL_GPL(sja1000_interrupt);
0564 
0565 static int sja1000_open(struct net_device *dev)
0566 {
0567     struct sja1000_priv *priv = netdev_priv(dev);
0568     int err;
0569 
0570     /* set chip into reset mode */
0571     set_reset_mode(dev);
0572 
0573     /* common open */
0574     err = open_candev(dev);
0575     if (err)
0576         return err;
0577 
0578     /* register interrupt handler, if not done by the device driver */
0579     if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER)) {
0580         err = request_irq(dev->irq, sja1000_interrupt, priv->irq_flags,
0581                   dev->name, (void *)dev);
0582         if (err) {
0583             close_candev(dev);
0584             return -EAGAIN;
0585         }
0586     }
0587 
0588     /* init and start chi */
0589     sja1000_start(dev);
0590 
0591     netif_start_queue(dev);
0592 
0593     return 0;
0594 }
0595 
0596 static int sja1000_close(struct net_device *dev)
0597 {
0598     struct sja1000_priv *priv = netdev_priv(dev);
0599 
0600     netif_stop_queue(dev);
0601     set_reset_mode(dev);
0602 
0603     if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER))
0604         free_irq(dev->irq, (void *)dev);
0605 
0606     close_candev(dev);
0607 
0608     return 0;
0609 }
0610 
0611 struct net_device *alloc_sja1000dev(int sizeof_priv)
0612 {
0613     struct net_device *dev;
0614     struct sja1000_priv *priv;
0615 
0616     dev = alloc_candev(sizeof(struct sja1000_priv) + sizeof_priv,
0617         SJA1000_ECHO_SKB_MAX);
0618     if (!dev)
0619         return NULL;
0620 
0621     priv = netdev_priv(dev);
0622 
0623     priv->dev = dev;
0624     priv->can.bittiming_const = &sja1000_bittiming_const;
0625     priv->can.do_set_bittiming = sja1000_set_bittiming;
0626     priv->can.do_set_mode = sja1000_set_mode;
0627     priv->can.do_get_berr_counter = sja1000_get_berr_counter;
0628     priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK |
0629                        CAN_CTRLMODE_LISTENONLY |
0630                        CAN_CTRLMODE_3_SAMPLES |
0631                        CAN_CTRLMODE_ONE_SHOT |
0632                        CAN_CTRLMODE_BERR_REPORTING |
0633                        CAN_CTRLMODE_PRESUME_ACK |
0634                        CAN_CTRLMODE_CC_LEN8_DLC;
0635 
0636     spin_lock_init(&priv->cmdreg_lock);
0637 
0638     if (sizeof_priv)
0639         priv->priv = (void *)priv + sizeof(struct sja1000_priv);
0640 
0641     return dev;
0642 }
0643 EXPORT_SYMBOL_GPL(alloc_sja1000dev);
0644 
0645 void free_sja1000dev(struct net_device *dev)
0646 {
0647     free_candev(dev);
0648 }
0649 EXPORT_SYMBOL_GPL(free_sja1000dev);
0650 
0651 static const struct net_device_ops sja1000_netdev_ops = {
0652     .ndo_open   = sja1000_open,
0653     .ndo_stop   = sja1000_close,
0654     .ndo_start_xmit = sja1000_start_xmit,
0655     .ndo_change_mtu = can_change_mtu,
0656 };
0657 
0658 static const struct ethtool_ops sja1000_ethtool_ops = {
0659     .get_ts_info = ethtool_op_get_ts_info,
0660 };
0661 
0662 int register_sja1000dev(struct net_device *dev)
0663 {
0664     int ret;
0665 
0666     if (!sja1000_probe_chip(dev))
0667         return -ENODEV;
0668 
0669     dev->flags |= IFF_ECHO; /* we support local echo */
0670     dev->netdev_ops = &sja1000_netdev_ops;
0671     dev->ethtool_ops = &sja1000_ethtool_ops;
0672 
0673     set_reset_mode(dev);
0674     chipset_init(dev);
0675 
0676     ret =  register_candev(dev);
0677 
0678     return ret;
0679 }
0680 EXPORT_SYMBOL_GPL(register_sja1000dev);
0681 
0682 void unregister_sja1000dev(struct net_device *dev)
0683 {
0684     set_reset_mode(dev);
0685     unregister_candev(dev);
0686 }
0687 EXPORT_SYMBOL_GPL(unregister_sja1000dev);
0688 
0689 static __init int sja1000_init(void)
0690 {
0691     printk(KERN_INFO "%s CAN netdevice driver\n", DRV_NAME);
0692 
0693     return 0;
0694 }
0695 
0696 module_init(sja1000_init);
0697 
0698 static __exit void sja1000_exit(void)
0699 {
0700     printk(KERN_INFO "%s: driver removed\n", DRV_NAME);
0701 }
0702 
0703 module_exit(sja1000_exit);
[ Source navigation ] [ Diff markup ] [ Identifier search ] [ general search ]

This page was automatically generated by the 2.1.0 LXR engine.

The LXR team
Valid CSS 2.1! Valid HTML 4.01!