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898 lines
23 KiB
898 lines
23 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Core driver for the CC770 and AN82527 CAN controllers |
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* |
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* Copyright (C) 2009, 2011 Wolfgang Grandegger <[email protected]> |
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*/ |
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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#include <linux/module.h> |
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#include <linux/init.h> |
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#include <linux/kernel.h> |
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#include <linux/sched.h> |
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#include <linux/types.h> |
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#include <linux/fcntl.h> |
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#include <linux/interrupt.h> |
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#include <linux/ptrace.h> |
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#include <linux/string.h> |
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#include <linux/errno.h> |
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#include <linux/netdevice.h> |
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#include <linux/if_arp.h> |
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#include <linux/if_ether.h> |
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#include <linux/skbuff.h> |
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#include <linux/delay.h> |
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#include <linux/can.h> |
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#include <linux/can/dev.h> |
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#include <linux/can/error.h> |
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#include <linux/can/platform/cc770.h> |
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#include "cc770.h" |
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MODULE_AUTHOR("Wolfgang Grandegger <[email protected]>"); |
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MODULE_LICENSE("GPL v2"); |
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MODULE_DESCRIPTION(KBUILD_MODNAME "CAN netdevice driver"); |
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/* |
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* The CC770 is a CAN controller from Bosch, which is 100% compatible |
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* with the AN82527 from Intel, but with "bugs" being fixed and some |
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* additional functionality, mainly: |
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* |
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* 1. RX and TX error counters are readable. |
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* 2. Support of silent (listen-only) mode. |
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* 3. Message object 15 can receive all types of frames, also RTR and EFF. |
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* |
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* Details are available from Bosch's "CC770_Product_Info_2007-01.pdf", |
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* which explains in detail the compatibility between the CC770 and the |
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* 82527. This driver use the additional functionality 3. on real CC770 |
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* devices. Unfortunately, the CC770 does still not store the message |
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* identifier of received remote transmission request frames and |
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* therefore it's set to 0. |
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* |
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* The message objects 1..14 can be used for TX and RX while the message |
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* objects 15 is optimized for RX. It has a shadow register for reliable |
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* data reception under heavy bus load. Therefore it makes sense to use |
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* this message object for the needed use case. The frame type (EFF/SFF) |
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* for the message object 15 can be defined via kernel module parameter |
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* "msgobj15_eff". If not equal 0, it will receive 29-bit EFF frames, |
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* otherwise 11 bit SFF messages. |
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*/ |
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static int msgobj15_eff; |
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module_param(msgobj15_eff, int, 0444); |
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MODULE_PARM_DESC(msgobj15_eff, "Extended 29-bit frames for message object 15 " |
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"(default: 11-bit standard frames)"); |
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static int i82527_compat; |
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module_param(i82527_compat, int, 0444); |
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MODULE_PARM_DESC(i82527_compat, "Strict Intel 82527 compatibility mode " |
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"without using additional functions"); |
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/* |
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* This driver uses the last 5 message objects 11..15. The definitions |
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* and structure below allows to configure and assign them to the real |
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* message object. |
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*/ |
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static unsigned char cc770_obj_flags[CC770_OBJ_MAX] = { |
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[CC770_OBJ_RX0] = CC770_OBJ_FLAG_RX, |
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[CC770_OBJ_RX1] = CC770_OBJ_FLAG_RX | CC770_OBJ_FLAG_EFF, |
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[CC770_OBJ_RX_RTR0] = CC770_OBJ_FLAG_RX | CC770_OBJ_FLAG_RTR, |
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[CC770_OBJ_RX_RTR1] = CC770_OBJ_FLAG_RX | CC770_OBJ_FLAG_RTR | |
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CC770_OBJ_FLAG_EFF, |
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[CC770_OBJ_TX] = 0, |
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}; |
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static const struct can_bittiming_const cc770_bittiming_const = { |
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.name = KBUILD_MODNAME, |
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.tseg1_min = 1, |
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.tseg1_max = 16, |
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.tseg2_min = 1, |
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.tseg2_max = 8, |
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.sjw_max = 4, |
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.brp_min = 1, |
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.brp_max = 64, |
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.brp_inc = 1, |
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}; |
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static inline int intid2obj(unsigned int intid) |
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{ |
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if (intid == 2) |
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return 0; |
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else |
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return MSGOBJ_LAST + 2 - intid; |
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} |
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static void enable_all_objs(const struct net_device *dev) |
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{ |
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struct cc770_priv *priv = netdev_priv(dev); |
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u8 msgcfg; |
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unsigned char obj_flags; |
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unsigned int o, mo; |
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for (o = 0; o < ARRAY_SIZE(priv->obj_flags); o++) { |
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obj_flags = priv->obj_flags[o]; |
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mo = obj2msgobj(o); |
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if (obj_flags & CC770_OBJ_FLAG_RX) { |
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/* |
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* We don't need extra objects for RTR and EFF if |
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* the additional CC770 functions are enabled. |
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*/ |
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if (priv->control_normal_mode & CTRL_EAF) { |
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if (o > 0) |
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continue; |
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netdev_dbg(dev, "Message object %d for " |
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"RX data, RTR, SFF and EFF\n", mo); |
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} else { |
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netdev_dbg(dev, |
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"Message object %d for RX %s %s\n", |
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mo, obj_flags & CC770_OBJ_FLAG_RTR ? |
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"RTR" : "data", |
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obj_flags & CC770_OBJ_FLAG_EFF ? |
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"EFF" : "SFF"); |
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} |
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if (obj_flags & CC770_OBJ_FLAG_EFF) |
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msgcfg = MSGCFG_XTD; |
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else |
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msgcfg = 0; |
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if (obj_flags & CC770_OBJ_FLAG_RTR) |
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msgcfg |= MSGCFG_DIR; |
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cc770_write_reg(priv, msgobj[mo].config, msgcfg); |
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cc770_write_reg(priv, msgobj[mo].ctrl0, |
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MSGVAL_SET | TXIE_RES | |
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RXIE_SET | INTPND_RES); |
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if (obj_flags & CC770_OBJ_FLAG_RTR) |
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cc770_write_reg(priv, msgobj[mo].ctrl1, |
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NEWDAT_RES | CPUUPD_SET | |
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TXRQST_RES | RMTPND_RES); |
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else |
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cc770_write_reg(priv, msgobj[mo].ctrl1, |
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NEWDAT_RES | MSGLST_RES | |
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TXRQST_RES | RMTPND_RES); |
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} else { |
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netdev_dbg(dev, "Message object %d for " |
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"TX data, RTR, SFF and EFF\n", mo); |
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cc770_write_reg(priv, msgobj[mo].ctrl1, |
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RMTPND_RES | TXRQST_RES | |
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CPUUPD_RES | NEWDAT_RES); |
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cc770_write_reg(priv, msgobj[mo].ctrl0, |
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MSGVAL_RES | TXIE_RES | |
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RXIE_RES | INTPND_RES); |
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} |
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} |
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} |
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static void disable_all_objs(const struct cc770_priv *priv) |
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{ |
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int o, mo; |
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for (o = 0; o < ARRAY_SIZE(priv->obj_flags); o++) { |
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mo = obj2msgobj(o); |
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if (priv->obj_flags[o] & CC770_OBJ_FLAG_RX) { |
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if (o > 0 && priv->control_normal_mode & CTRL_EAF) |
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continue; |
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cc770_write_reg(priv, msgobj[mo].ctrl1, |
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NEWDAT_RES | MSGLST_RES | |
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TXRQST_RES | RMTPND_RES); |
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cc770_write_reg(priv, msgobj[mo].ctrl0, |
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MSGVAL_RES | TXIE_RES | |
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RXIE_RES | INTPND_RES); |
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} else { |
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/* Clear message object for send */ |
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cc770_write_reg(priv, msgobj[mo].ctrl1, |
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RMTPND_RES | TXRQST_RES | |
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CPUUPD_RES | NEWDAT_RES); |
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cc770_write_reg(priv, msgobj[mo].ctrl0, |
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MSGVAL_RES | TXIE_RES | |
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RXIE_RES | INTPND_RES); |
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} |
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} |
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} |
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static void set_reset_mode(struct net_device *dev) |
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{ |
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struct cc770_priv *priv = netdev_priv(dev); |
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/* Enable configuration and puts chip in bus-off, disable interrupts */ |
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cc770_write_reg(priv, control, CTRL_CCE | CTRL_INI); |
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priv->can.state = CAN_STATE_STOPPED; |
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/* Clear interrupts */ |
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cc770_read_reg(priv, interrupt); |
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/* Clear status register */ |
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cc770_write_reg(priv, status, 0); |
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/* Disable all used message objects */ |
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disable_all_objs(priv); |
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} |
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static void set_normal_mode(struct net_device *dev) |
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{ |
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struct cc770_priv *priv = netdev_priv(dev); |
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/* Clear interrupts */ |
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cc770_read_reg(priv, interrupt); |
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/* Clear status register and pre-set last error code */ |
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cc770_write_reg(priv, status, STAT_LEC_MASK); |
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/* Enable all used message objects*/ |
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enable_all_objs(dev); |
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/* |
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* Clear bus-off, interrupts only for errors, |
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* not for status change |
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*/ |
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cc770_write_reg(priv, control, priv->control_normal_mode); |
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priv->can.state = CAN_STATE_ERROR_ACTIVE; |
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} |
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static void chipset_init(struct cc770_priv *priv) |
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{ |
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int mo, id, data; |
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/* Enable configuration and put chip in bus-off, disable interrupts */ |
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cc770_write_reg(priv, control, (CTRL_CCE | CTRL_INI)); |
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/* Set CLKOUT divider and slew rates */ |
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cc770_write_reg(priv, clkout, priv->clkout); |
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/* Configure CPU interface / CLKOUT enable */ |
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cc770_write_reg(priv, cpu_interface, priv->cpu_interface); |
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/* Set bus configuration */ |
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cc770_write_reg(priv, bus_config, priv->bus_config); |
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/* Clear interrupts */ |
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cc770_read_reg(priv, interrupt); |
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/* Clear status register */ |
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cc770_write_reg(priv, status, 0); |
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/* Clear and invalidate message objects */ |
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for (mo = MSGOBJ_FIRST; mo <= MSGOBJ_LAST; mo++) { |
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cc770_write_reg(priv, msgobj[mo].ctrl0, |
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INTPND_UNC | RXIE_RES | |
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TXIE_RES | MSGVAL_RES); |
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cc770_write_reg(priv, msgobj[mo].ctrl0, |
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INTPND_RES | RXIE_RES | |
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TXIE_RES | MSGVAL_RES); |
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cc770_write_reg(priv, msgobj[mo].ctrl1, |
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NEWDAT_RES | MSGLST_RES | |
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TXRQST_RES | RMTPND_RES); |
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for (data = 0; data < 8; data++) |
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cc770_write_reg(priv, msgobj[mo].data[data], 0); |
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for (id = 0; id < 4; id++) |
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cc770_write_reg(priv, msgobj[mo].id[id], 0); |
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cc770_write_reg(priv, msgobj[mo].config, 0); |
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} |
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/* Set all global ID masks to "don't care" */ |
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cc770_write_reg(priv, global_mask_std[0], 0); |
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cc770_write_reg(priv, global_mask_std[1], 0); |
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cc770_write_reg(priv, global_mask_ext[0], 0); |
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cc770_write_reg(priv, global_mask_ext[1], 0); |
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cc770_write_reg(priv, global_mask_ext[2], 0); |
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cc770_write_reg(priv, global_mask_ext[3], 0); |
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} |
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static int cc770_probe_chip(struct net_device *dev) |
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{ |
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struct cc770_priv *priv = netdev_priv(dev); |
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/* Enable configuration, put chip in bus-off, disable ints */ |
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cc770_write_reg(priv, control, CTRL_CCE | CTRL_EAF | CTRL_INI); |
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/* Configure cpu interface / CLKOUT disable */ |
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cc770_write_reg(priv, cpu_interface, priv->cpu_interface); |
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/* |
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* Check if hardware reset is still inactive or maybe there |
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* is no chip in this address space |
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*/ |
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if (cc770_read_reg(priv, cpu_interface) & CPUIF_RST) { |
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netdev_info(dev, "probing @0x%p failed (reset)\n", |
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priv->reg_base); |
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return -ENODEV; |
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} |
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/* Write and read back test pattern (some arbitrary values) */ |
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cc770_write_reg(priv, msgobj[1].data[1], 0x25); |
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cc770_write_reg(priv, msgobj[2].data[3], 0x52); |
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cc770_write_reg(priv, msgobj[10].data[6], 0xc3); |
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if ((cc770_read_reg(priv, msgobj[1].data[1]) != 0x25) || |
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(cc770_read_reg(priv, msgobj[2].data[3]) != 0x52) || |
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(cc770_read_reg(priv, msgobj[10].data[6]) != 0xc3)) { |
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netdev_info(dev, "probing @0x%p failed (pattern)\n", |
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priv->reg_base); |
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return -ENODEV; |
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} |
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/* Check if this chip is a CC770 supporting additional functions */ |
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if (cc770_read_reg(priv, control) & CTRL_EAF) |
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priv->control_normal_mode |= CTRL_EAF; |
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return 0; |
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} |
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static void cc770_start(struct net_device *dev) |
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{ |
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struct cc770_priv *priv = netdev_priv(dev); |
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/* leave reset mode */ |
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if (priv->can.state != CAN_STATE_STOPPED) |
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set_reset_mode(dev); |
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/* leave reset mode */ |
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set_normal_mode(dev); |
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} |
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static int cc770_set_mode(struct net_device *dev, enum can_mode mode) |
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{ |
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switch (mode) { |
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case CAN_MODE_START: |
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cc770_start(dev); |
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netif_wake_queue(dev); |
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break; |
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default: |
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return -EOPNOTSUPP; |
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} |
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return 0; |
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} |
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static int cc770_set_bittiming(struct net_device *dev) |
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{ |
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struct cc770_priv *priv = netdev_priv(dev); |
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struct can_bittiming *bt = &priv->can.bittiming; |
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u8 btr0, btr1; |
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btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6); |
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btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) | |
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(((bt->phase_seg2 - 1) & 0x7) << 4); |
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if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) |
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btr1 |= 0x80; |
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netdev_info(dev, "setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1); |
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cc770_write_reg(priv, bit_timing_0, btr0); |
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cc770_write_reg(priv, bit_timing_1, btr1); |
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return 0; |
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} |
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static int cc770_get_berr_counter(const struct net_device *dev, |
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struct can_berr_counter *bec) |
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{ |
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struct cc770_priv *priv = netdev_priv(dev); |
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bec->txerr = cc770_read_reg(priv, tx_error_counter); |
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bec->rxerr = cc770_read_reg(priv, rx_error_counter); |
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return 0; |
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} |
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static void cc770_tx(struct net_device *dev, int mo) |
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{ |
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struct cc770_priv *priv = netdev_priv(dev); |
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struct can_frame *cf = (struct can_frame *)priv->tx_skb->data; |
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u8 dlc, rtr; |
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u32 id; |
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int i; |
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dlc = cf->len; |
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id = cf->can_id; |
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rtr = cf->can_id & CAN_RTR_FLAG ? 0 : MSGCFG_DIR; |
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cc770_write_reg(priv, msgobj[mo].ctrl0, |
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MSGVAL_RES | TXIE_RES | RXIE_RES | INTPND_RES); |
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cc770_write_reg(priv, msgobj[mo].ctrl1, |
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RMTPND_RES | TXRQST_RES | CPUUPD_SET | NEWDAT_RES); |
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if (id & CAN_EFF_FLAG) { |
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id &= CAN_EFF_MASK; |
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cc770_write_reg(priv, msgobj[mo].config, |
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(dlc << 4) | rtr | MSGCFG_XTD); |
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cc770_write_reg(priv, msgobj[mo].id[3], id << 3); |
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cc770_write_reg(priv, msgobj[mo].id[2], id >> 5); |
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cc770_write_reg(priv, msgobj[mo].id[1], id >> 13); |
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cc770_write_reg(priv, msgobj[mo].id[0], id >> 21); |
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} else { |
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id &= CAN_SFF_MASK; |
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cc770_write_reg(priv, msgobj[mo].config, (dlc << 4) | rtr); |
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cc770_write_reg(priv, msgobj[mo].id[0], id >> 3); |
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cc770_write_reg(priv, msgobj[mo].id[1], id << 5); |
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} |
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for (i = 0; i < dlc; i++) |
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cc770_write_reg(priv, msgobj[mo].data[i], cf->data[i]); |
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cc770_write_reg(priv, msgobj[mo].ctrl1, |
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RMTPND_UNC | TXRQST_SET | CPUUPD_RES | NEWDAT_UNC); |
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cc770_write_reg(priv, msgobj[mo].ctrl0, |
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MSGVAL_SET | TXIE_SET | RXIE_SET | INTPND_UNC); |
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} |
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static netdev_tx_t cc770_start_xmit(struct sk_buff *skb, struct net_device *dev) |
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{ |
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struct cc770_priv *priv = netdev_priv(dev); |
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unsigned int mo = obj2msgobj(CC770_OBJ_TX); |
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if (can_dropped_invalid_skb(dev, skb)) |
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return NETDEV_TX_OK; |
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netif_stop_queue(dev); |
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if ((cc770_read_reg(priv, |
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msgobj[mo].ctrl1) & TXRQST_UNC) == TXRQST_SET) { |
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netdev_err(dev, "TX register is still occupied!\n"); |
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return NETDEV_TX_BUSY; |
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} |
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priv->tx_skb = skb; |
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cc770_tx(dev, mo); |
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return NETDEV_TX_OK; |
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} |
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static void cc770_rx(struct net_device *dev, unsigned int mo, u8 ctrl1) |
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{ |
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struct cc770_priv *priv = netdev_priv(dev); |
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struct net_device_stats *stats = &dev->stats; |
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struct can_frame *cf; |
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struct sk_buff *skb; |
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u8 config; |
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u32 id; |
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int i; |
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skb = alloc_can_skb(dev, &cf); |
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if (!skb) |
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return; |
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config = cc770_read_reg(priv, msgobj[mo].config); |
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|
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if (ctrl1 & RMTPND_SET) { |
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/* |
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* Unfortunately, the chip does not store the real message |
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* identifier of the received remote transmission request |
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* frame. Therefore we set it to 0. |
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*/ |
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cf->can_id = CAN_RTR_FLAG; |
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if (config & MSGCFG_XTD) |
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cf->can_id |= CAN_EFF_FLAG; |
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cf->len = 0; |
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} else { |
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if (config & MSGCFG_XTD) { |
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id = cc770_read_reg(priv, msgobj[mo].id[3]); |
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id |= cc770_read_reg(priv, msgobj[mo].id[2]) << 8; |
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id |= cc770_read_reg(priv, msgobj[mo].id[1]) << 16; |
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id |= cc770_read_reg(priv, msgobj[mo].id[0]) << 24; |
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id >>= 3; |
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id |= CAN_EFF_FLAG; |
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} else { |
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id = cc770_read_reg(priv, msgobj[mo].id[1]); |
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id |= cc770_read_reg(priv, msgobj[mo].id[0]) << 8; |
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id >>= 5; |
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} |
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cf->can_id = id; |
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cf->len = can_cc_dlc2len((config & 0xf0) >> 4); |
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for (i = 0; i < cf->len; i++) |
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cf->data[i] = cc770_read_reg(priv, msgobj[mo].data[i]); |
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} |
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stats->rx_packets++; |
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stats->rx_bytes += cf->len; |
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netif_rx(skb); |
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} |
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static int cc770_err(struct net_device *dev, u8 status) |
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{ |
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struct cc770_priv *priv = netdev_priv(dev); |
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struct net_device_stats *stats = &dev->stats; |
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struct can_frame *cf; |
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struct sk_buff *skb; |
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u8 lec; |
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netdev_dbg(dev, "status interrupt (%#x)\n", status); |
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skb = alloc_can_err_skb(dev, &cf); |
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if (!skb) |
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return -ENOMEM; |
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|
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/* Use extended functions of the CC770 */ |
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if (priv->control_normal_mode & CTRL_EAF) { |
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cf->data[6] = cc770_read_reg(priv, tx_error_counter); |
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cf->data[7] = cc770_read_reg(priv, rx_error_counter); |
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} |
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|
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if (status & STAT_BOFF) { |
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/* Disable interrupts */ |
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cc770_write_reg(priv, control, CTRL_INI); |
|
cf->can_id |= CAN_ERR_BUSOFF; |
|
priv->can.state = CAN_STATE_BUS_OFF; |
|
priv->can.can_stats.bus_off++; |
|
can_bus_off(dev); |
|
} else if (status & STAT_WARN) { |
|
cf->can_id |= CAN_ERR_CRTL; |
|
/* Only the CC770 does show error passive */ |
|
if (cf->data[7] > 127) { |
|
cf->data[1] = CAN_ERR_CRTL_RX_PASSIVE | |
|
CAN_ERR_CRTL_TX_PASSIVE; |
|
priv->can.state = CAN_STATE_ERROR_PASSIVE; |
|
priv->can.can_stats.error_passive++; |
|
} else { |
|
cf->data[1] = CAN_ERR_CRTL_RX_WARNING | |
|
CAN_ERR_CRTL_TX_WARNING; |
|
priv->can.state = CAN_STATE_ERROR_WARNING; |
|
priv->can.can_stats.error_warning++; |
|
} |
|
} else { |
|
/* Back to error active */ |
|
cf->can_id |= CAN_ERR_PROT; |
|
cf->data[2] = CAN_ERR_PROT_ACTIVE; |
|
priv->can.state = CAN_STATE_ERROR_ACTIVE; |
|
} |
|
|
|
lec = status & STAT_LEC_MASK; |
|
if (lec < 7 && lec > 0) { |
|
if (lec == STAT_LEC_ACK) { |
|
cf->can_id |= CAN_ERR_ACK; |
|
} else { |
|
cf->can_id |= CAN_ERR_PROT; |
|
switch (lec) { |
|
case STAT_LEC_STUFF: |
|
cf->data[2] |= CAN_ERR_PROT_STUFF; |
|
break; |
|
case STAT_LEC_FORM: |
|
cf->data[2] |= CAN_ERR_PROT_FORM; |
|
break; |
|
case STAT_LEC_BIT1: |
|
cf->data[2] |= CAN_ERR_PROT_BIT1; |
|
break; |
|
case STAT_LEC_BIT0: |
|
cf->data[2] |= CAN_ERR_PROT_BIT0; |
|
break; |
|
case STAT_LEC_CRC: |
|
cf->data[3] = CAN_ERR_PROT_LOC_CRC_SEQ; |
|
break; |
|
} |
|
} |
|
} |
|
|
|
|
|
stats->rx_packets++; |
|
stats->rx_bytes += cf->len; |
|
netif_rx(skb); |
|
|
|
return 0; |
|
} |
|
|
|
static int cc770_status_interrupt(struct net_device *dev) |
|
{ |
|
struct cc770_priv *priv = netdev_priv(dev); |
|
u8 status; |
|
|
|
status = cc770_read_reg(priv, status); |
|
/* Reset the status register including RXOK and TXOK */ |
|
cc770_write_reg(priv, status, STAT_LEC_MASK); |
|
|
|
if (status & (STAT_WARN | STAT_BOFF) || |
|
(status & STAT_LEC_MASK) != STAT_LEC_MASK) { |
|
cc770_err(dev, status); |
|
return status & STAT_BOFF; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static void cc770_rx_interrupt(struct net_device *dev, unsigned int o) |
|
{ |
|
struct cc770_priv *priv = netdev_priv(dev); |
|
struct net_device_stats *stats = &dev->stats; |
|
unsigned int mo = obj2msgobj(o); |
|
u8 ctrl1; |
|
int n = CC770_MAX_MSG; |
|
|
|
while (n--) { |
|
ctrl1 = cc770_read_reg(priv, msgobj[mo].ctrl1); |
|
|
|
if (!(ctrl1 & NEWDAT_SET)) { |
|
/* Check for RTR if additional functions are enabled */ |
|
if (priv->control_normal_mode & CTRL_EAF) { |
|
if (!(cc770_read_reg(priv, msgobj[mo].ctrl0) & |
|
INTPND_SET)) |
|
break; |
|
} else { |
|
break; |
|
} |
|
} |
|
|
|
if (ctrl1 & MSGLST_SET) { |
|
stats->rx_over_errors++; |
|
stats->rx_errors++; |
|
} |
|
if (mo < MSGOBJ_LAST) |
|
cc770_write_reg(priv, msgobj[mo].ctrl1, |
|
NEWDAT_RES | MSGLST_RES | |
|
TXRQST_UNC | RMTPND_UNC); |
|
cc770_rx(dev, mo, ctrl1); |
|
|
|
cc770_write_reg(priv, msgobj[mo].ctrl0, |
|
MSGVAL_SET | TXIE_RES | |
|
RXIE_SET | INTPND_RES); |
|
cc770_write_reg(priv, msgobj[mo].ctrl1, |
|
NEWDAT_RES | MSGLST_RES | |
|
TXRQST_RES | RMTPND_RES); |
|
} |
|
} |
|
|
|
static void cc770_rtr_interrupt(struct net_device *dev, unsigned int o) |
|
{ |
|
struct cc770_priv *priv = netdev_priv(dev); |
|
unsigned int mo = obj2msgobj(o); |
|
u8 ctrl0, ctrl1; |
|
int n = CC770_MAX_MSG; |
|
|
|
while (n--) { |
|
ctrl0 = cc770_read_reg(priv, msgobj[mo].ctrl0); |
|
if (!(ctrl0 & INTPND_SET)) |
|
break; |
|
|
|
ctrl1 = cc770_read_reg(priv, msgobj[mo].ctrl1); |
|
cc770_rx(dev, mo, ctrl1); |
|
|
|
cc770_write_reg(priv, msgobj[mo].ctrl0, |
|
MSGVAL_SET | TXIE_RES | |
|
RXIE_SET | INTPND_RES); |
|
cc770_write_reg(priv, msgobj[mo].ctrl1, |
|
NEWDAT_RES | CPUUPD_SET | |
|
TXRQST_RES | RMTPND_RES); |
|
} |
|
} |
|
|
|
static void cc770_tx_interrupt(struct net_device *dev, unsigned int o) |
|
{ |
|
struct cc770_priv *priv = netdev_priv(dev); |
|
struct net_device_stats *stats = &dev->stats; |
|
unsigned int mo = obj2msgobj(o); |
|
struct can_frame *cf; |
|
u8 ctrl1; |
|
|
|
ctrl1 = cc770_read_reg(priv, msgobj[mo].ctrl1); |
|
|
|
cc770_write_reg(priv, msgobj[mo].ctrl0, |
|
MSGVAL_RES | TXIE_RES | RXIE_RES | INTPND_RES); |
|
cc770_write_reg(priv, msgobj[mo].ctrl1, |
|
RMTPND_RES | TXRQST_RES | MSGLST_RES | NEWDAT_RES); |
|
|
|
if (unlikely(!priv->tx_skb)) { |
|
netdev_err(dev, "missing tx skb in tx interrupt\n"); |
|
return; |
|
} |
|
|
|
if (unlikely(ctrl1 & MSGLST_SET)) { |
|
stats->rx_over_errors++; |
|
stats->rx_errors++; |
|
} |
|
|
|
/* When the CC770 is sending an RTR message and it receives a regular |
|
* message that matches the id of the RTR message, it will overwrite the |
|
* outgoing message in the TX register. When this happens we must |
|
* process the received message and try to transmit the outgoing skb |
|
* again. |
|
*/ |
|
if (unlikely(ctrl1 & NEWDAT_SET)) { |
|
cc770_rx(dev, mo, ctrl1); |
|
cc770_tx(dev, mo); |
|
return; |
|
} |
|
|
|
cf = (struct can_frame *)priv->tx_skb->data; |
|
stats->tx_bytes += cf->len; |
|
stats->tx_packets++; |
|
|
|
can_put_echo_skb(priv->tx_skb, dev, 0, 0); |
|
can_get_echo_skb(dev, 0, NULL); |
|
priv->tx_skb = NULL; |
|
|
|
netif_wake_queue(dev); |
|
} |
|
|
|
static irqreturn_t cc770_interrupt(int irq, void *dev_id) |
|
{ |
|
struct net_device *dev = (struct net_device *)dev_id; |
|
struct cc770_priv *priv = netdev_priv(dev); |
|
u8 intid; |
|
int o, n = 0; |
|
|
|
/* Shared interrupts and IRQ off? */ |
|
if (priv->can.state == CAN_STATE_STOPPED) |
|
return IRQ_NONE; |
|
|
|
if (priv->pre_irq) |
|
priv->pre_irq(priv); |
|
|
|
while (n < CC770_MAX_IRQ) { |
|
/* Read the highest pending interrupt request */ |
|
intid = cc770_read_reg(priv, interrupt); |
|
if (!intid) |
|
break; |
|
n++; |
|
|
|
if (intid == 1) { |
|
/* Exit in case of bus-off */ |
|
if (cc770_status_interrupt(dev)) |
|
break; |
|
} else { |
|
o = intid2obj(intid); |
|
|
|
if (o >= CC770_OBJ_MAX) { |
|
netdev_err(dev, "Unexpected interrupt id %d\n", |
|
intid); |
|
continue; |
|
} |
|
|
|
if (priv->obj_flags[o] & CC770_OBJ_FLAG_RTR) |
|
cc770_rtr_interrupt(dev, o); |
|
else if (priv->obj_flags[o] & CC770_OBJ_FLAG_RX) |
|
cc770_rx_interrupt(dev, o); |
|
else |
|
cc770_tx_interrupt(dev, o); |
|
} |
|
} |
|
|
|
if (priv->post_irq) |
|
priv->post_irq(priv); |
|
|
|
if (n >= CC770_MAX_IRQ) |
|
netdev_dbg(dev, "%d messages handled in ISR", n); |
|
|
|
return (n) ? IRQ_HANDLED : IRQ_NONE; |
|
} |
|
|
|
static int cc770_open(struct net_device *dev) |
|
{ |
|
struct cc770_priv *priv = netdev_priv(dev); |
|
int err; |
|
|
|
/* set chip into reset mode */ |
|
set_reset_mode(dev); |
|
|
|
/* common open */ |
|
err = open_candev(dev); |
|
if (err) |
|
return err; |
|
|
|
err = request_irq(dev->irq, &cc770_interrupt, priv->irq_flags, |
|
dev->name, dev); |
|
if (err) { |
|
close_candev(dev); |
|
return -EAGAIN; |
|
} |
|
|
|
/* init and start chip */ |
|
cc770_start(dev); |
|
|
|
netif_start_queue(dev); |
|
|
|
return 0; |
|
} |
|
|
|
static int cc770_close(struct net_device *dev) |
|
{ |
|
netif_stop_queue(dev); |
|
set_reset_mode(dev); |
|
|
|
free_irq(dev->irq, dev); |
|
close_candev(dev); |
|
|
|
return 0; |
|
} |
|
|
|
struct net_device *alloc_cc770dev(int sizeof_priv) |
|
{ |
|
struct net_device *dev; |
|
struct cc770_priv *priv; |
|
|
|
dev = alloc_candev(sizeof(struct cc770_priv) + sizeof_priv, |
|
CC770_ECHO_SKB_MAX); |
|
if (!dev) |
|
return NULL; |
|
|
|
priv = netdev_priv(dev); |
|
|
|
priv->dev = dev; |
|
priv->can.bittiming_const = &cc770_bittiming_const; |
|
priv->can.do_set_bittiming = cc770_set_bittiming; |
|
priv->can.do_set_mode = cc770_set_mode; |
|
priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES; |
|
priv->tx_skb = NULL; |
|
|
|
memcpy(priv->obj_flags, cc770_obj_flags, sizeof(cc770_obj_flags)); |
|
|
|
if (sizeof_priv) |
|
priv->priv = (void *)priv + sizeof(struct cc770_priv); |
|
|
|
return dev; |
|
} |
|
EXPORT_SYMBOL_GPL(alloc_cc770dev); |
|
|
|
void free_cc770dev(struct net_device *dev) |
|
{ |
|
free_candev(dev); |
|
} |
|
EXPORT_SYMBOL_GPL(free_cc770dev); |
|
|
|
static const struct net_device_ops cc770_netdev_ops = { |
|
.ndo_open = cc770_open, |
|
.ndo_stop = cc770_close, |
|
.ndo_start_xmit = cc770_start_xmit, |
|
.ndo_change_mtu = can_change_mtu, |
|
}; |
|
|
|
int register_cc770dev(struct net_device *dev) |
|
{ |
|
struct cc770_priv *priv = netdev_priv(dev); |
|
int err; |
|
|
|
err = cc770_probe_chip(dev); |
|
if (err) |
|
return err; |
|
|
|
dev->netdev_ops = &cc770_netdev_ops; |
|
|
|
dev->flags |= IFF_ECHO; /* we support local echo */ |
|
|
|
/* Should we use additional functions? */ |
|
if (!i82527_compat && priv->control_normal_mode & CTRL_EAF) { |
|
priv->can.do_get_berr_counter = cc770_get_berr_counter; |
|
priv->control_normal_mode = CTRL_IE | CTRL_EAF | CTRL_EIE; |
|
netdev_dbg(dev, "i82527 mode with additional functions\n"); |
|
} else { |
|
priv->control_normal_mode = CTRL_IE | CTRL_EIE; |
|
netdev_dbg(dev, "strict i82527 compatibility mode\n"); |
|
} |
|
|
|
chipset_init(priv); |
|
set_reset_mode(dev); |
|
|
|
return register_candev(dev); |
|
} |
|
EXPORT_SYMBOL_GPL(register_cc770dev); |
|
|
|
void unregister_cc770dev(struct net_device *dev) |
|
{ |
|
set_reset_mode(dev); |
|
unregister_candev(dev); |
|
} |
|
EXPORT_SYMBOL_GPL(unregister_cc770dev); |
|
|
|
static __init int cc770_init(void) |
|
{ |
|
if (msgobj15_eff) { |
|
cc770_obj_flags[CC770_OBJ_RX0] |= CC770_OBJ_FLAG_EFF; |
|
cc770_obj_flags[CC770_OBJ_RX1] &= ~CC770_OBJ_FLAG_EFF; |
|
} |
|
|
|
pr_info("CAN netdevice driver\n"); |
|
|
|
return 0; |
|
} |
|
module_init(cc770_init); |
|
|
|
static __exit void cc770_exit(void) |
|
{ |
|
pr_info("driver removed\n"); |
|
} |
|
module_exit(cc770_exit);
|
|
|