can: cc770: add driver core for the Bosch CC770 and Intel AN82527 (b440752d) · Commits · e / devices / android_kernel_teracube_emerald

drivers/net/can/Kconfig

+2 −0

Original line number	Diff line number	Diff line
		@@ -116,6 +116,8 @@ source "drivers/net/can/sja1000/Kconfig"

		source "drivers/net/can/c_can/Kconfig"

		source "drivers/net/can/cc770/Kconfig"

		source "drivers/net/can/usb/Kconfig"

		source "drivers/net/can/softing/Kconfig"

drivers/net/can/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -14,6 +14,7 @@ obj-y += softing/
		obj-$(CONFIG_CAN_SJA1000) += sja1000/
		obj-$(CONFIG_CAN_MSCAN) += mscan/
		obj-$(CONFIG_CAN_C_CAN) += c_can/
		obj-$(CONFIG_CAN_CC770) += cc770/
		obj-$(CONFIG_CAN_AT91) += at91_can.o
		obj-$(CONFIG_CAN_TI_HECC) += ti_hecc.o
		obj-$(CONFIG_CAN_MCP251X) += mcp251x.o

drivers/net/can/cc770/Kconfig

0 → 100644

+3 −0

Original line number	Diff line number	Diff line
		menuconfig CAN_CC770
		tristate "Bosch CC770 and Intel AN82527 devices"
		depends on CAN_DEV && HAS_IOMEM

drivers/net/can/cc770/Makefile

0 → 100644

+7 −0

Original line number	Diff line number	Diff line
		#
		# Makefile for the Bosch CC770 CAN controller drivers.
		#

		obj-$(CONFIG_CAN_CC770) += cc770.o

		ccflags-$(CONFIG_CAN_DEBUG_DEVICES) := -DDEBUG

drivers/net/can/cc770/cc770.c

0 → 100644

+895 −0

Original line number	Diff line number	Diff line
		/*
		* cc770.c - Bosch CC770 and Intel AN82527 network device driver
		*
		* Copyright (C) 2009, 2011 Wolfgang Grandegger <wg@grandegger.com>
		*
		* Derived from the old Socket-CAN i82527 driver:
		*
		* Copyright (c) 2002-2007 Volkswagen Group Electronic Research
		* All rights reserved.
		*
		* Redistribution and use in source and binary forms, with or without
		* modification, are permitted provided that the following conditions
		* are met:
		* 1. Redistributions of source code must retain the above copyright
		* notice, this list of conditions and the following disclaimer.
		* 2. Redistributions in binary form must reproduce the above copyright
		* notice, this list of conditions and the following disclaimer in the
		* documentation and/or other materials provided with the distribution.
		* 3. Neither the name of Volkswagen nor the names of its contributors
		* may be used to endorse or promote products derived from this software
		* without specific prior written permission.
		*
		* Alternatively, provided that this notice is retained in full, this
		* software may be distributed under the terms of the GNU General
		* Public License ("GPL") version 2, in which case the provisions of the
		* GPL apply INSTEAD OF those given above.
		*
		* The provided data structures and external interfaces from this code
		* are not restricted to be used by modules with a GPL compatible license.
		*
		* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
		* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
		* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
		* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
		* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
		* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
		* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
		* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
		* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
		* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
		* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
		* DAMAGE.
		*
		* Send feedback to <socketcan-users@lists.berlios.de>
		*/

		#include <linux/module.h>
		#include <linux/init.h>
		#include <linux/kernel.h>
		#include <linux/version.h>
		#include <linux/sched.h>
		#include <linux/types.h>
		#include <linux/fcntl.h>
		#include <linux/interrupt.h>
		#include <linux/ptrace.h>
		#include <linux/string.h>
		#include <linux/errno.h>
		#include <linux/netdevice.h>
		#include <linux/if_arp.h>
		#include <linux/if_ether.h>
		#include <linux/skbuff.h>
		#include <linux/delay.h>

		#include <linux/can.h>
		#include <linux/can/dev.h>
		#include <linux/can/error.h>
		#include <linux/can/dev.h>

		#include "cc770.h"

		#define DRV_NAME "cc770"

		MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
		MODULE_LICENSE("GPL v2");
		MODULE_DESCRIPTION(DRV_NAME "CAN netdevice driver");

		/*
		* The CC770 is a CAN controller from Bosch, which is 100% compatible
		* with the AN82527 from Intel, but with "bugs" being fixed and some
		* additional functionality, mainly:
		*
		* 1. RX and TX error counters are readable.
		* 2. Support of silent (listen-only) mode.
		* 3. Message object 15 can receive all types of frames, also RTR and EFF.
		*
		* Details are available from Bosch's "CC770_Product_Info_2007-01.pdf",
		* which explains in detail the compatibility between the CC770 and the
		* 82527. This driver use the additional functionality 3. on real CC770
		* devices. Unfortunately, the CC770 does still not store the message
		* identifier of received remote transmission request frames and
		* therefore it's set to 0.
		*
		* The message objects 1..14 can be used for TX and RX while the message
		* objects 15 is optimized for RX. It has a shadow register for reliable
		* data receiption under heavy bus load. Therefore it makes sense to use
		* this message object for the needed use case. The frame type (EFF/SFF)
		* for the message object 15 can be defined via kernel module parameter
		* "msgobj15_eff". If not equal 0, it will receive 29-bit EFF frames,
		* otherwise 11 bit SFF messages.
		*/
		static int msgobj15_eff;
		module_param(msgobj15_eff, int, S_IRUGO);
		MODULE_PARM_DESC(msgobj15_eff, "Extended 29-bit frames for message object 15 "
		"(default: 11-bit standard frames)");

		static int i82527_compat;
		module_param(i82527_compat, int, S_IRUGO);
		MODULE_PARM_DESC(i82527_compat, "Strict Intel 82527 comptibility mode "
		"without using additional functions");

		/*
		* This driver uses the last 5 message objects 11..15. The definitions
		* and structure below allows to configure and assign them to the real
		* message object.
		*/
		static unsigned char cc770_obj_flags[CC770_OBJ_MAX] = {
		[CC770_OBJ_RX0] = CC770_OBJ_FLAG_RX,
		[CC770_OBJ_RX1] = CC770_OBJ_FLAG_RX \| CC770_OBJ_FLAG_EFF,
		[CC770_OBJ_RX_RTR0] = CC770_OBJ_FLAG_RX \| CC770_OBJ_FLAG_RTR,
		[CC770_OBJ_RX_RTR1] = CC770_OBJ_FLAG_RX \| CC770_OBJ_FLAG_RTR \|
		CC770_OBJ_FLAG_EFF,
		[CC770_OBJ_TX] = 0,
		};

		static struct can_bittiming_const cc770_bittiming_const = {
		.name = DRV_NAME,
		.tseg1_min = 1,
		.tseg1_max = 16,
		.tseg2_min = 1,
		.tseg2_max = 8,
		.sjw_max = 4,
		.brp_min = 1,
		.brp_max = 64,
		.brp_inc = 1,
		};

		static inline int intid2obj(unsigned int intid)
		{
		if (intid == 2)
		return 0;
		else
		return MSGOBJ_LAST + 2 - intid;
		}

		static void enable_all_objs(const struct net_device *dev)
		{
		struct cc770_priv *priv = netdev_priv(dev);
		u8 msgcfg;
		unsigned char obj_flags;
		unsigned int o, mo;

		for (o = 0; o < CC770_OBJ_MAX; o++) {
		obj_flags = priv->obj_flags[o];
		mo = obj2msgobj(o);

		if (obj_flags & CC770_OBJ_FLAG_RX) {
		/*
		* We don't need extra objects for RTR and EFF if
		* the additional CC770 functions are enabled.
		*/
		if (priv->control_normal_mode & CTRL_EAF) {
		if (o > 0)
		continue;
		netdev_dbg(dev, "Message object %d for "
		"RX data, RTR, SFF and EFF\n", mo);
		} else {
		netdev_dbg(dev,
		"Message object %d for RX %s %s\n",
		mo, obj_flags & CC770_OBJ_FLAG_RTR ?
		"RTR" : "data",
		obj_flags & CC770_OBJ_FLAG_EFF ?
		"EFF" : "SFF");
		}

		if (obj_flags & CC770_OBJ_FLAG_EFF)
		msgcfg = MSGCFG_XTD;
		else
		msgcfg = 0;
		if (obj_flags & CC770_OBJ_FLAG_RTR)
		msgcfg \|= MSGCFG_DIR;

		cc770_write_reg(priv, msgobj[mo].config, msgcfg);
		cc770_write_reg(priv, msgobj[mo].ctrl0,
		MSGVAL_SET \| TXIE_RES \|
		RXIE_SET \| INTPND_RES);

		if (obj_flags & CC770_OBJ_FLAG_RTR)
		cc770_write_reg(priv, msgobj[mo].ctrl1,
		NEWDAT_RES \| CPUUPD_SET \|
		TXRQST_RES \| RMTPND_RES);
		else
		cc770_write_reg(priv, msgobj[mo].ctrl1,
		NEWDAT_RES \| MSGLST_RES \|
		TXRQST_RES \| RMTPND_RES);
		} else {
		netdev_dbg(dev, "Message object %d for "
		"TX data, RTR, SFF and EFF\n", mo);

		cc770_write_reg(priv, msgobj[mo].ctrl1,
		RMTPND_RES \| TXRQST_RES \|
		CPUUPD_RES \| NEWDAT_RES);
		cc770_write_reg(priv, msgobj[mo].ctrl0,
		MSGVAL_RES \| TXIE_RES \|
		RXIE_RES \| INTPND_RES);
		}
		}
		}

		static void disable_all_objs(const struct cc770_priv *priv)
		{
		int i, mo;

		for (i = 0; i < CC770_OBJ_MAX; i++) {
		mo = obj2msgobj(i);

		if (priv->obj_flags[i] & CC770_OBJ_FLAG_RX) {
		if (i > 0 && priv->control_normal_mode & CTRL_EAF)
		continue;

		cc770_write_reg(priv, msgobj[mo].ctrl1,
		NEWDAT_RES \| MSGLST_RES \|
		TXRQST_RES \| RMTPND_RES);
		cc770_write_reg(priv, msgobj[mo].ctrl0,
		MSGVAL_RES \| TXIE_RES \|
		RXIE_RES \| INTPND_RES);
		} else {
		/* Clear message object for send */
		cc770_write_reg(priv, msgobj[mo].ctrl1,
		RMTPND_RES \| TXRQST_RES \|
		CPUUPD_RES \| NEWDAT_RES);
		cc770_write_reg(priv, msgobj[mo].ctrl0,
		MSGVAL_RES \| TXIE_RES \|
		RXIE_RES \| INTPND_RES);
		}
		}
		}

		static void set_reset_mode(struct net_device *dev)
		{
		struct cc770_priv *priv = netdev_priv(dev);

		/* Enable configuration and puts chip in bus-off, disable interrupts */
		cc770_write_reg(priv, control, CTRL_CCE \| CTRL_INI);

		priv->can.state = CAN_STATE_STOPPED;

		/* Clear interrupts */
		cc770_read_reg(priv, interrupt);

		/* Clear status register */
		cc770_write_reg(priv, status, 0);

		/* Disable all used message objects */
		disable_all_objs(priv);
		}

		static void set_normal_mode(struct net_device *dev)
		{
		struct cc770_priv *priv = netdev_priv(dev);

		/* Clear interrupts */
		cc770_read_reg(priv, interrupt);

		/* Clear status register and pre-set last error code */
		cc770_write_reg(priv, status, STAT_LEC_MASK);

		/* Enable all used message objects*/
		enable_all_objs(dev);

		/*
		* Clear bus-off, interrupts only for errors,
		* not for status change
		*/
		cc770_write_reg(priv, control, priv->control_normal_mode);

		priv->can.state = CAN_STATE_ERROR_ACTIVE;
		}

		static void chipset_init(struct cc770_priv *priv)
		{
		int mo, id, data;

		/* Enable configuration and put chip in bus-off, disable interrupts */
		cc770_write_reg(priv, control, (CTRL_CCE \| CTRL_INI));

		/* Set CLKOUT divider and slew rates */
		cc770_write_reg(priv, clkout, priv->clkout);

		/* Configure CPU interface / CLKOUT enable */
		cc770_write_reg(priv, cpu_interface, priv->cpu_interface \| CPUIF_CEN);

		/* Set bus configuration */
		cc770_write_reg(priv, bus_config, priv->bus_config);

		/* Clear interrupts */
		cc770_read_reg(priv, interrupt);

		/* Clear status register */
		cc770_write_reg(priv, status, 0);

		/* Clear and invalidate message objects */
		for (mo = MSGOBJ_FIRST; mo <= MSGOBJ_LAST; mo++) {
		cc770_write_reg(priv, msgobj[mo].ctrl0,
		INTPND_UNC \| RXIE_RES \|
		TXIE_RES \| MSGVAL_RES);
		cc770_write_reg(priv, msgobj[mo].ctrl0,
		INTPND_RES \| RXIE_RES \|
		TXIE_RES \| MSGVAL_RES);
		cc770_write_reg(priv, msgobj[mo].ctrl1,
		NEWDAT_RES \| MSGLST_RES \|
		TXRQST_RES \| RMTPND_RES);
		for (data = 0; data < 8; data++)
		cc770_write_reg(priv, msgobj[mo].data[data], 0);
		for (id = 0; id < 4; id++)
		cc770_write_reg(priv, msgobj[mo].id[id], 0);
		cc770_write_reg(priv, msgobj[mo].config, 0);
		}

		/* Set all global ID masks to "don't care" */
		cc770_write_reg(priv, global_mask_std[0], 0);
		cc770_write_reg(priv, global_mask_std[1], 0);
		cc770_write_reg(priv, global_mask_ext[0], 0);
		cc770_write_reg(priv, global_mask_ext[1], 0);
		cc770_write_reg(priv, global_mask_ext[2], 0);
		cc770_write_reg(priv, global_mask_ext[3], 0);

		}

		static int cc770_probe_chip(struct net_device *dev)
		{
		struct cc770_priv *priv = netdev_priv(dev);

		/* Enable configuration, put chip in bus-off, disable ints */
		cc770_write_reg(priv, control, CTRL_CCE \| CTRL_EAF \| CTRL_INI);
		/* Configure cpu interface / CLKOUT disable */
		cc770_write_reg(priv, cpu_interface, priv->cpu_interface);

		/*
		* Check if hardware reset is still inactive or maybe there
		* is no chip in this address space
		*/
		if (cc770_read_reg(priv, cpu_interface) & CPUIF_RST) {
		netdev_info(dev, "probing @0x%p failed (reset)\n",
		priv->reg_base);
		return 0;
		}

		/* Write and read back test pattern */
		cc770_write_reg(priv, msgobj[1].data[1], 0x25);
		cc770_write_reg(priv, msgobj[2].data[3], 0x52);
		cc770_write_reg(priv, msgobj[10].data[6], 0xc3);
		if ((cc770_read_reg(priv, msgobj[1].data[1]) != 0x25) \|\|
		(cc770_read_reg(priv, msgobj[2].data[3]) != 0x52) \|\|
		(cc770_read_reg(priv, msgobj[10].data[6]) != 0xc3)) {
		netdev_info(dev, "probing @0x%p failed (pattern)\n",
		priv->reg_base);
		return 0;
		}

		/* Check if this chip is a CC770 supporting additional functions */
		if (cc770_read_reg(priv, control) & CTRL_EAF)
		priv->control_normal_mode \|= CTRL_EAF;

		return 1;
		}

		static void cc770_start(struct net_device *dev)
		{
		struct cc770_priv *priv = netdev_priv(dev);

		/* leave reset mode */
		if (priv->can.state != CAN_STATE_STOPPED)
		set_reset_mode(dev);

		/* leave reset mode */
		set_normal_mode(dev);
		}

		static int cc770_set_mode(struct net_device *dev, enum can_mode mode)
		{
		struct cc770_priv *priv = netdev_priv(dev);

		if (!priv->open_time)
		return -EINVAL;

		switch (mode) {
		case CAN_MODE_START:
		cc770_start(dev);
		if (netif_queue_stopped(dev))
		netif_wake_queue(dev);
		break;

		default:
		return -EOPNOTSUPP;
		}

		return 0;
		}

		static int cc770_set_bittiming(struct net_device *dev)
		{
		struct cc770_priv *priv = netdev_priv(dev);
		struct can_bittiming *bt = &priv->can.bittiming;
		u8 btr0, btr1;

		btr0 = ((bt->brp - 1) & 0x3f) \| (((bt->sjw - 1) & 0x3) << 6);
		btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) \|
		(((bt->phase_seg2 - 1) & 0x7) << 4);
		if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
		btr1 \|= 0x80;

		netdev_info(dev, "setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1);

		cc770_write_reg(priv, bit_timing_0, btr0);
		cc770_write_reg(priv, bit_timing_1, btr1);

		return 0;
		}

		static netdev_tx_t cc770_start_xmit(struct sk_buff skb, struct net_device dev)
		{
		struct cc770_priv *priv = netdev_priv(dev);
		struct net_device_stats *stats = &dev->stats;
		struct can_frame cf = (struct can_frame )skb->data;
		unsigned int mo = obj2msgobj(CC770_OBJ_TX);
		u8 dlc, rtr;
		u32 id;
		int i;

		if (can_dropped_invalid_skb(dev, skb))
		return NETDEV_TX_OK;

		if ((cc770_read_reg(priv,
		msgobj[mo].ctrl1) & TXRQST_UNC) == TXRQST_SET) {
		netdev_err(dev, "TX register is still occupied!\n");
		return NETDEV_TX_BUSY;
		}

		netif_stop_queue(dev);

		dlc = cf->can_dlc;
		id = cf->can_id;
		if (cf->can_id & CAN_RTR_FLAG)
		rtr = 0;
		else
		rtr = MSGCFG_DIR;
		cc770_write_reg(priv, msgobj[mo].ctrl1,
		RMTPND_RES \| TXRQST_RES \| CPUUPD_SET \| NEWDAT_RES);
		cc770_write_reg(priv, msgobj[mo].ctrl0,
		MSGVAL_SET \| TXIE_SET \| RXIE_RES \| INTPND_RES);
		if (id & CAN_EFF_FLAG) {
		id &= CAN_EFF_MASK;
		cc770_write_reg(priv, msgobj[mo].config,
		(dlc << 4) + rtr + MSGCFG_XTD);
		cc770_write_reg(priv, msgobj[mo].id[3],
		(id << 3) & 0xFFU);
		cc770_write_reg(priv, msgobj[mo].id[2],
		(id >> 5) & 0xFFU);
		cc770_write_reg(priv, msgobj[mo].id[1],
		(id >> 13) & 0xFFU);
		cc770_write_reg(priv, msgobj[mo].id[0],
		(id >> 21) & 0xFFU);
		} else {
		id &= CAN_SFF_MASK;
		cc770_write_reg(priv, msgobj[mo].config,
		(dlc << 4) + rtr);
		cc770_write_reg(priv, msgobj[mo].id[0],
		(id >> 3) & 0xFFU);
		cc770_write_reg(priv, msgobj[mo].id[1],
		(id << 5) & 0xFFU);
		}

		dlc &= 0x0f; /* restore length only */
		for (i = 0; i < dlc; i++)
		cc770_write_reg(priv, msgobj[mo].data[i], cf->data[i]);

		cc770_write_reg(priv, msgobj[mo].ctrl1,
		RMTPND_RES \| TXRQST_SET \| CPUUPD_RES \| NEWDAT_UNC);

		stats->tx_bytes += dlc;

		can_put_echo_skb(skb, dev, 0);

		/*
		* HM: We had some cases of repeated IRQs so make sure the
		* INT is acknowledged I know it's already further up, but
		* doing again fixed the issue
		*/
		cc770_write_reg(priv, msgobj[mo].ctrl0,
		MSGVAL_UNC \| TXIE_UNC \| RXIE_UNC \| INTPND_RES);

		return NETDEV_TX_OK;
		}

		static void cc770_rx(struct net_device *dev, unsigned int mo, u8 ctrl1)
		{
		struct cc770_priv *priv = netdev_priv(dev);
		struct net_device_stats *stats = &dev->stats;
		struct can_frame *cf;
		struct sk_buff *skb;
		u8 config;
		u32 id;
		int i;

		skb = alloc_can_skb(dev, &cf);
		if (skb == NULL)
		return;

		config = cc770_read_reg(priv, msgobj[mo].config);

		if (ctrl1 & RMTPND_SET) {
		/*
		* Unfortunately, the chip does not store the real message
		* identifier of the received remote transmission request
		* frame. Therefore we set it to 0.
		*/
		cf->can_id = CAN_RTR_FLAG;
		if (config & MSGCFG_XTD)
		cf->can_id \|= CAN_EFF_FLAG;
		cf->can_dlc = 0;
		} else {
		if (config & MSGCFG_XTD) {
		id = cc770_read_reg(priv, msgobj[mo].id[3]);
		id \|= cc770_read_reg(priv, msgobj[mo].id[2]) << 8;
		id \|= cc770_read_reg(priv, msgobj[mo].id[1]) << 16;
		id \|= cc770_read_reg(priv, msgobj[mo].id[0]) << 24;
		id >>= 3;
		id \|= CAN_EFF_FLAG;
		} else {
		id = cc770_read_reg(priv, msgobj[mo].id[1]);
		id \|= cc770_read_reg(priv, msgobj[mo].id[0]) << 8;
		id >>= 5;
		}

		cf->can_id = id;
		cf->can_dlc = get_can_dlc((config & 0xf0) >> 4);
		for (i = 0; i < cf->can_dlc; i++)
		cf->data[i] = cc770_read_reg(priv, msgobj[mo].data[i]);
		}
		netif_rx(skb);

		stats->rx_packets++;
		stats->rx_bytes += cf->can_dlc;
		}

		static int cc770_err(struct net_device *dev, u8 status)
		{
		struct cc770_priv *priv = netdev_priv(dev);
		struct net_device_stats *stats = &dev->stats;
		struct can_frame *cf;
		struct sk_buff *skb;
		u8 lec;

		netdev_dbg(dev, "status interrupt (%#x)\n", status);

		skb = alloc_can_err_skb(dev, &cf);
		if (skb == NULL)
		return -ENOMEM;

		if (status & STAT_BOFF) {
		/* Disable interrupts */
		cc770_write_reg(priv, control, CTRL_INI);
		cf->can_id \|= CAN_ERR_BUSOFF;
		priv->can.state = CAN_STATE_BUS_OFF;
		can_bus_off(dev);
		} else if (status & STAT_WARN) {
		cf->can_id \|= CAN_ERR_CRTL;
		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++;
		}

		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;
		}
		}
		}

		netif_rx(skb);

		stats->rx_packets++;
		stats->rx_bytes += cf->can_dlc;

		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;

		while (1) {
		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;

		while (1) {
		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);

		/* Nothing more to send, switch off interrupts */
		cc770_write_reg(priv, msgobj[mo].ctrl0,
		MSGVAL_RES \| TXIE_RES \| RXIE_RES \| INTPND_RES);
		/*
		* We had some cases of repeated IRQ so make sure the
		* INT is acknowledged
		*/
		cc770_write_reg(priv, msgobj[mo].ctrl0,
		MSGVAL_UNC \| TXIE_UNC \| RXIE_UNC \| INTPND_RES);

		stats->tx_packets++;
		can_get_echo_skb(dev, 0);
		netif_wake_queue(dev);
		}

		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, (void *)dev);
		if (err) {
		close_candev(dev);
		return -EAGAIN;
		}

		/* init and start chip */
		cc770_start(dev);
		priv->open_time = jiffies;

		netif_start_queue(dev);

		return 0;
		}

		static int cc770_close(struct net_device *dev)
		{
		struct cc770_priv *priv = netdev_priv(dev);

		netif_stop_queue(dev);
		set_reset_mode(dev);

		free_irq(dev->irq, (void *)dev);
		close_candev(dev);

		priv->open_time = 0;

		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;

		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,
		};

		int register_cc770dev(struct net_device *dev)
		{
		struct cc770_priv *priv = netdev_priv(dev);

		if (!cc770_probe_chip(dev))
		return -ENODEV;

		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->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("%s CAN netdevice driver\n", DRV_NAME);

		return 0;
		}
		module_init(cc770_init);

		static __exit void cc770_exit(void)
		{
		pr_info("%s: driver removed\n", DRV_NAME);
		}
		module_exit(cc770_exit);