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linux/drivers/net/can/cc770/cc770.c

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// SPDX-License-Identifier: GPL-2.0-only
/*
* Core driver for the CC770 and AN82527 CAN controllers
*
* Copyright (C) 2009, 2011 Wolfgang Grandegger <wg@grandegger.com>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.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/platform/cc770.h>
#include "cc770.h"
MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION(KBUILD_MODNAME "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 reception 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, 0444);
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, 0444);
MODULE_PARM_DESC(i82527_compat, "Strict Intel 82527 compatibility 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 const struct can_bittiming_const cc770_bittiming_const = {
.name = KBUILD_MODNAME,
.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 < ARRAY_SIZE(priv->obj_flags); 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 o, mo;
for (o = 0; o < ARRAY_SIZE(priv->obj_flags); o++) {
mo = obj2msgobj(o);
if (priv->obj_flags[o] & CC770_OBJ_FLAG_RX) {
if (o > 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);
/* 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 -ENODEV;
}
/* Write and read back test pattern (some arbitrary values) */
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 -ENODEV;
}
/* 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 0;
}
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)
{
switch (mode) {
case CAN_MODE_START:
cc770_start(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 int cc770_get_berr_counter(const struct net_device *dev,
struct can_berr_counter *bec)
{
struct cc770_priv *priv = netdev_priv(dev);
bec->txerr = cc770_read_reg(priv, tx_error_counter);
bec->rxerr = cc770_read_reg(priv, rx_error_counter);
return 0;
}
static void cc770_tx(struct net_device *dev, int mo)
{
struct cc770_priv *priv = netdev_priv(dev);
struct can_frame *cf = (struct can_frame *)priv->tx_skb->data;
u8 dlc, rtr;
u32 id;
int i;
dlc = cf->can_dlc;
id = cf->can_id;
rtr = cf->can_id & CAN_RTR_FLAG ? 0 : MSGCFG_DIR;
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 | CPUUPD_SET | NEWDAT_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);
cc770_write_reg(priv, msgobj[mo].id[2], id >> 5);
cc770_write_reg(priv, msgobj[mo].id[1], id >> 13);
cc770_write_reg(priv, msgobj[mo].id[0], id >> 21);
} 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);
cc770_write_reg(priv, msgobj[mo].id[1], id << 5);
}
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_UNC | TXRQST_SET | CPUUPD_RES | NEWDAT_UNC);
cc770_write_reg(priv, msgobj[mo].ctrl0,
MSGVAL_SET | TXIE_SET | RXIE_SET | INTPND_UNC);
}
static netdev_tx_t cc770_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct cc770_priv *priv = netdev_priv(dev);
unsigned int mo = obj2msgobj(CC770_OBJ_TX);
if (can_dropped_invalid_skb(dev, skb))
return NETDEV_TX_OK;
netif_stop_queue(dev);
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;
}
priv->tx_skb = skb;
cc770_tx(dev, mo);
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)
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]);
}
stats->rx_packets++;
stats->rx_bytes += cf->can_dlc;
netif_rx(skb);
}
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)
return -ENOMEM;
/* Use extended functions of the CC770 */
if (priv->control_normal_mode & CTRL_EAF) {
cf->data[6] = cc770_read_reg(priv, tx_error_counter);
cf->data[7] = cc770_read_reg(priv, rx_error_counter);
}
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;
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 avtive */
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->can_dlc;
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->can_dlc;
stats->tx_packets++;
can_put_echo_skb(priv->tx_skb, dev, 0);
can_get_echo_skb(dev, 0);
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);
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