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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 <[email protected]>
- */
- #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/ethtool.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 <[email protected]>");
- 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->len;
- 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_dev_dropped_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->len = 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->len = can_cc_dlc2len((config & 0xf0) >> 4);
- for (i = 0; i < cf->len; i++)
- cf->data[i] = cc770_read_reg(priv, msgobj[mo].data[i]);
- stats->rx_bytes += cf->len;
- }
- stats->rx_packets++;
- netif_rx(skb);
- }
- static int cc770_err(struct net_device *dev, u8 status)
- {
- struct cc770_priv *priv = netdev_priv(dev);
- 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->can_id |= CAN_ERR_CNT;
- 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 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;
- }
- }
- }
- 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);
- 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;
- }
- can_put_echo_skb(priv->tx_skb, dev, 0, 0);
- stats->tx_bytes += can_get_echo_skb(dev, 0, NULL);
- stats->tx_packets++;
- 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,
- };
- static const struct ethtool_ops cc770_ethtool_ops = {
- .get_ts_info = ethtool_op_get_ts_info,
- };
- 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->ethtool_ops = &cc770_ethtool_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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