2011-02-13 23:51:44 -07:00
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/*
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* CAN bus driver for Bosch C_CAN controller
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*
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* Copyright (C) 2010 ST Microelectronics
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* Bhupesh Sharma <bhupesh.sharma@st.com>
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*
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* Borrowed heavily from the C_CAN driver originally written by:
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* Copyright (C) 2007
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* - Sascha Hauer, Marc Kleine-Budde, Pengutronix <s.hauer@pengutronix.de>
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* - Simon Kallweit, intefo AG <simon.kallweit@intefo.ch>
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*
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* TX and RX NAPI implementation has been borrowed from at91 CAN driver
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* written by:
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* Copyright
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* (C) 2007 by Hans J. Koch <hjk@hansjkoch.de>
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* (C) 2008, 2009 by Marc Kleine-Budde <kernel@pengutronix.de>
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*
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* Bosch C_CAN controller is compliant to CAN protocol version 2.0 part A and B.
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* Bosch C_CAN user manual can be obtained from:
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* http://www.semiconductors.bosch.de/media/en/pdf/ipmodules_1/c_can/
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* users_manual_c_can.pdf
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/delay.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/list.h>
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#include <linux/io.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 "c_can.h"
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/* control register */
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#define CONTROL_TEST BIT(7)
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#define CONTROL_CCE BIT(6)
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#define CONTROL_DISABLE_AR BIT(5)
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#define CONTROL_ENABLE_AR (0 << 5)
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#define CONTROL_EIE BIT(3)
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#define CONTROL_SIE BIT(2)
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#define CONTROL_IE BIT(1)
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#define CONTROL_INIT BIT(0)
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/* test register */
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#define TEST_RX BIT(7)
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#define TEST_TX1 BIT(6)
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#define TEST_TX2 BIT(5)
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#define TEST_LBACK BIT(4)
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#define TEST_SILENT BIT(3)
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#define TEST_BASIC BIT(2)
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/* status register */
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#define STATUS_BOFF BIT(7)
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#define STATUS_EWARN BIT(6)
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#define STATUS_EPASS BIT(5)
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#define STATUS_RXOK BIT(4)
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#define STATUS_TXOK BIT(3)
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/* error counter register */
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#define ERR_CNT_TEC_MASK 0xff
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#define ERR_CNT_TEC_SHIFT 0
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#define ERR_CNT_REC_SHIFT 8
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#define ERR_CNT_REC_MASK (0x7f << ERR_CNT_REC_SHIFT)
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#define ERR_CNT_RP_SHIFT 15
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#define ERR_CNT_RP_MASK (0x1 << ERR_CNT_RP_SHIFT)
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/* bit-timing register */
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#define BTR_BRP_MASK 0x3f
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#define BTR_BRP_SHIFT 0
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#define BTR_SJW_SHIFT 6
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#define BTR_SJW_MASK (0x3 << BTR_SJW_SHIFT)
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#define BTR_TSEG1_SHIFT 8
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#define BTR_TSEG1_MASK (0xf << BTR_TSEG1_SHIFT)
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#define BTR_TSEG2_SHIFT 12
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#define BTR_TSEG2_MASK (0x7 << BTR_TSEG2_SHIFT)
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/* brp extension register */
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#define BRP_EXT_BRPE_MASK 0x0f
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#define BRP_EXT_BRPE_SHIFT 0
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/* IFx command request */
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#define IF_COMR_BUSY BIT(15)
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/* IFx command mask */
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#define IF_COMM_WR BIT(7)
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#define IF_COMM_MASK BIT(6)
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#define IF_COMM_ARB BIT(5)
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#define IF_COMM_CONTROL BIT(4)
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#define IF_COMM_CLR_INT_PND BIT(3)
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#define IF_COMM_TXRQST BIT(2)
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#define IF_COMM_DATAA BIT(1)
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#define IF_COMM_DATAB BIT(0)
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#define IF_COMM_ALL (IF_COMM_MASK | IF_COMM_ARB | \
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IF_COMM_CONTROL | IF_COMM_TXRQST | \
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IF_COMM_DATAA | IF_COMM_DATAB)
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/* IFx arbitration */
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#define IF_ARB_MSGVAL BIT(15)
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#define IF_ARB_MSGXTD BIT(14)
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#define IF_ARB_TRANSMIT BIT(13)
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/* IFx message control */
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#define IF_MCONT_NEWDAT BIT(15)
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#define IF_MCONT_MSGLST BIT(14)
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#define IF_MCONT_CLR_MSGLST (0 << 14)
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#define IF_MCONT_INTPND BIT(13)
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#define IF_MCONT_UMASK BIT(12)
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#define IF_MCONT_TXIE BIT(11)
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#define IF_MCONT_RXIE BIT(10)
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#define IF_MCONT_RMTEN BIT(9)
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#define IF_MCONT_TXRQST BIT(8)
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#define IF_MCONT_EOB BIT(7)
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#define IF_MCONT_DLC_MASK 0xf
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/*
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* IFx register masks:
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* allow easy operation on 16-bit registers when the
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* argument is 32-bit instead
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*/
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#define IFX_WRITE_LOW_16BIT(x) ((x) & 0xFFFF)
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#define IFX_WRITE_HIGH_16BIT(x) (((x) & 0xFFFF0000) >> 16)
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/* message object split */
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#define C_CAN_NO_OF_OBJECTS 32
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#define C_CAN_MSG_OBJ_RX_NUM 16
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#define C_CAN_MSG_OBJ_TX_NUM 16
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#define C_CAN_MSG_OBJ_RX_FIRST 1
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#define C_CAN_MSG_OBJ_RX_LAST (C_CAN_MSG_OBJ_RX_FIRST + \
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C_CAN_MSG_OBJ_RX_NUM - 1)
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#define C_CAN_MSG_OBJ_TX_FIRST (C_CAN_MSG_OBJ_RX_LAST + 1)
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#define C_CAN_MSG_OBJ_TX_LAST (C_CAN_MSG_OBJ_TX_FIRST + \
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C_CAN_MSG_OBJ_TX_NUM - 1)
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#define C_CAN_MSG_OBJ_RX_SPLIT 9
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#define C_CAN_MSG_RX_LOW_LAST (C_CAN_MSG_OBJ_RX_SPLIT - 1)
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#define C_CAN_NEXT_MSG_OBJ_MASK (C_CAN_MSG_OBJ_TX_NUM - 1)
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#define RECEIVE_OBJECT_BITS 0x0000ffff
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/* status interrupt */
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#define STATUS_INTERRUPT 0x8000
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/* global interrupt masks */
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#define ENABLE_ALL_INTERRUPTS 1
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#define DISABLE_ALL_INTERRUPTS 0
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/* minimum timeout for checking BUSY status */
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#define MIN_TIMEOUT_VALUE 6
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/* napi related */
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#define C_CAN_NAPI_WEIGHT C_CAN_MSG_OBJ_RX_NUM
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/* c_can lec values */
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enum c_can_lec_type {
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LEC_NO_ERROR = 0,
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LEC_STUFF_ERROR,
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LEC_FORM_ERROR,
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LEC_ACK_ERROR,
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LEC_BIT1_ERROR,
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LEC_BIT0_ERROR,
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LEC_CRC_ERROR,
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LEC_UNUSED,
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};
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/*
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* c_can error types:
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* Bus errors (BUS_OFF, ERROR_WARNING, ERROR_PASSIVE) are supported
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*/
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enum c_can_bus_error_types {
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C_CAN_NO_ERROR = 0,
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C_CAN_BUS_OFF,
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C_CAN_ERROR_WARNING,
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C_CAN_ERROR_PASSIVE,
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};
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static struct can_bittiming_const c_can_bittiming_const = {
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.name = KBUILD_MODNAME,
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.tseg1_min = 2, /* Time segment 1 = prop_seg + phase_seg1 */
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.tseg1_max = 16,
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.tseg2_min = 1, /* Time segment 2 = phase_seg2 */
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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 = 1024, /* 6-bit BRP field + 4-bit BRPE field*/
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.brp_inc = 1,
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};
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static inline int get_tx_next_msg_obj(const struct c_can_priv *priv)
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{
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return (priv->tx_next & C_CAN_NEXT_MSG_OBJ_MASK) +
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C_CAN_MSG_OBJ_TX_FIRST;
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}
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static inline int get_tx_echo_msg_obj(const struct c_can_priv *priv)
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{
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return (priv->tx_echo & C_CAN_NEXT_MSG_OBJ_MASK) +
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C_CAN_MSG_OBJ_TX_FIRST;
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}
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static u32 c_can_read_reg32(struct c_can_priv *priv, void *reg)
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{
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u32 val = priv->read_reg(priv, reg);
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val |= ((u32) priv->read_reg(priv, reg + 2)) << 16;
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return val;
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}
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static void c_can_enable_all_interrupts(struct c_can_priv *priv,
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int enable)
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{
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unsigned int cntrl_save = priv->read_reg(priv,
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&priv->regs->control);
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if (enable)
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cntrl_save |= (CONTROL_SIE | CONTROL_EIE | CONTROL_IE);
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else
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cntrl_save &= ~(CONTROL_EIE | CONTROL_IE | CONTROL_SIE);
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priv->write_reg(priv, &priv->regs->control, cntrl_save);
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}
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static inline int c_can_msg_obj_is_busy(struct c_can_priv *priv, int iface)
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{
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int count = MIN_TIMEOUT_VALUE;
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while (count && priv->read_reg(priv,
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&priv->regs->ifregs[iface].com_req) &
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IF_COMR_BUSY) {
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count--;
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udelay(1);
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}
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if (!count)
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return 1;
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return 0;
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}
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static inline void c_can_object_get(struct net_device *dev,
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int iface, int objno, int mask)
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{
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struct c_can_priv *priv = netdev_priv(dev);
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/*
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* As per specs, after writting the message object number in the
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* IF command request register the transfer b/w interface
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* register and message RAM must be complete in 6 CAN-CLK
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* period.
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*/
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priv->write_reg(priv, &priv->regs->ifregs[iface].com_mask,
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IFX_WRITE_LOW_16BIT(mask));
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priv->write_reg(priv, &priv->regs->ifregs[iface].com_req,
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IFX_WRITE_LOW_16BIT(objno));
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if (c_can_msg_obj_is_busy(priv, iface))
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netdev_err(dev, "timed out in object get\n");
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}
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static inline void c_can_object_put(struct net_device *dev,
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int iface, int objno, int mask)
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{
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struct c_can_priv *priv = netdev_priv(dev);
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/*
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* As per specs, after writting the message object number in the
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* IF command request register the transfer b/w interface
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* register and message RAM must be complete in 6 CAN-CLK
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* period.
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*/
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priv->write_reg(priv, &priv->regs->ifregs[iface].com_mask,
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(IF_COMM_WR | IFX_WRITE_LOW_16BIT(mask)));
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priv->write_reg(priv, &priv->regs->ifregs[iface].com_req,
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IFX_WRITE_LOW_16BIT(objno));
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if (c_can_msg_obj_is_busy(priv, iface))
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netdev_err(dev, "timed out in object put\n");
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}
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static void c_can_write_msg_object(struct net_device *dev,
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int iface, struct can_frame *frame, int objno)
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{
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int i;
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u16 flags = 0;
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unsigned int id;
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struct c_can_priv *priv = netdev_priv(dev);
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if (!(frame->can_id & CAN_RTR_FLAG))
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flags |= IF_ARB_TRANSMIT;
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if (frame->can_id & CAN_EFF_FLAG) {
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id = frame->can_id & CAN_EFF_MASK;
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flags |= IF_ARB_MSGXTD;
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} else
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id = ((frame->can_id & CAN_SFF_MASK) << 18);
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flags |= IF_ARB_MSGVAL;
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priv->write_reg(priv, &priv->regs->ifregs[iface].arb1,
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IFX_WRITE_LOW_16BIT(id));
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priv->write_reg(priv, &priv->regs->ifregs[iface].arb2, flags |
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IFX_WRITE_HIGH_16BIT(id));
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for (i = 0; i < frame->can_dlc; i += 2) {
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priv->write_reg(priv, &priv->regs->ifregs[iface].data[i / 2],
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frame->data[i] | (frame->data[i + 1] << 8));
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}
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/* enable interrupt for this message object */
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priv->write_reg(priv, &priv->regs->ifregs[iface].msg_cntrl,
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IF_MCONT_TXIE | IF_MCONT_TXRQST | IF_MCONT_EOB |
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frame->can_dlc);
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c_can_object_put(dev, iface, objno, IF_COMM_ALL);
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}
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static inline void c_can_mark_rx_msg_obj(struct net_device *dev,
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int iface, int ctrl_mask,
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int obj)
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{
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struct c_can_priv *priv = netdev_priv(dev);
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priv->write_reg(priv, &priv->regs->ifregs[iface].msg_cntrl,
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ctrl_mask & ~(IF_MCONT_MSGLST | IF_MCONT_INTPND));
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c_can_object_put(dev, iface, obj, IF_COMM_CONTROL);
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}
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static inline void c_can_activate_all_lower_rx_msg_obj(struct net_device *dev,
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int iface,
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int ctrl_mask)
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{
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int i;
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struct c_can_priv *priv = netdev_priv(dev);
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for (i = C_CAN_MSG_OBJ_RX_FIRST; i <= C_CAN_MSG_RX_LOW_LAST; i++) {
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priv->write_reg(priv, &priv->regs->ifregs[iface].msg_cntrl,
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|
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ctrl_mask & ~(IF_MCONT_MSGLST |
|
|
|
|
IF_MCONT_INTPND | IF_MCONT_NEWDAT));
|
|
|
|
c_can_object_put(dev, iface, i, IF_COMM_CONTROL);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline void c_can_activate_rx_msg_obj(struct net_device *dev,
|
|
|
|
int iface, int ctrl_mask,
|
|
|
|
int obj)
|
|
|
|
{
|
|
|
|
struct c_can_priv *priv = netdev_priv(dev);
|
|
|
|
|
|
|
|
priv->write_reg(priv, &priv->regs->ifregs[iface].msg_cntrl,
|
|
|
|
ctrl_mask & ~(IF_MCONT_MSGLST |
|
|
|
|
IF_MCONT_INTPND | IF_MCONT_NEWDAT));
|
|
|
|
c_can_object_put(dev, iface, obj, IF_COMM_CONTROL);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void c_can_handle_lost_msg_obj(struct net_device *dev,
|
|
|
|
int iface, int objno)
|
|
|
|
{
|
|
|
|
struct c_can_priv *priv = netdev_priv(dev);
|
|
|
|
struct net_device_stats *stats = &dev->stats;
|
|
|
|
struct sk_buff *skb;
|
|
|
|
struct can_frame *frame;
|
|
|
|
|
|
|
|
netdev_err(dev, "msg lost in buffer %d\n", objno);
|
|
|
|
|
|
|
|
c_can_object_get(dev, iface, objno, IF_COMM_ALL & ~IF_COMM_TXRQST);
|
|
|
|
|
|
|
|
priv->write_reg(priv, &priv->regs->ifregs[iface].msg_cntrl,
|
|
|
|
IF_MCONT_CLR_MSGLST);
|
|
|
|
|
|
|
|
c_can_object_put(dev, 0, objno, IF_COMM_CONTROL);
|
|
|
|
|
|
|
|
/* create an error msg */
|
|
|
|
skb = alloc_can_err_skb(dev, &frame);
|
|
|
|
if (unlikely(!skb))
|
|
|
|
return;
|
|
|
|
|
|
|
|
frame->can_id |= CAN_ERR_CRTL;
|
|
|
|
frame->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
|
|
|
|
stats->rx_errors++;
|
|
|
|
stats->rx_over_errors++;
|
|
|
|
|
|
|
|
netif_receive_skb(skb);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int c_can_read_msg_object(struct net_device *dev, int iface, int ctrl)
|
|
|
|
{
|
|
|
|
u16 flags, data;
|
|
|
|
int i;
|
|
|
|
unsigned int val;
|
|
|
|
struct c_can_priv *priv = netdev_priv(dev);
|
|
|
|
struct net_device_stats *stats = &dev->stats;
|
|
|
|
struct sk_buff *skb;
|
|
|
|
struct can_frame *frame;
|
|
|
|
|
|
|
|
skb = alloc_can_skb(dev, &frame);
|
|
|
|
if (!skb) {
|
|
|
|
stats->rx_dropped++;
|
|
|
|
return -ENOMEM;
|
|
|
|
}
|
|
|
|
|
|
|
|
frame->can_dlc = get_can_dlc(ctrl & 0x0F);
|
|
|
|
|
|
|
|
flags = priv->read_reg(priv, &priv->regs->ifregs[iface].arb2);
|
|
|
|
val = priv->read_reg(priv, &priv->regs->ifregs[iface].arb1) |
|
|
|
|
(flags << 16);
|
|
|
|
|
|
|
|
if (flags & IF_ARB_MSGXTD)
|
|
|
|
frame->can_id = (val & CAN_EFF_MASK) | CAN_EFF_FLAG;
|
|
|
|
else
|
|
|
|
frame->can_id = (val >> 18) & CAN_SFF_MASK;
|
|
|
|
|
|
|
|
if (flags & IF_ARB_TRANSMIT)
|
|
|
|
frame->can_id |= CAN_RTR_FLAG;
|
|
|
|
else {
|
|
|
|
for (i = 0; i < frame->can_dlc; i += 2) {
|
|
|
|
data = priv->read_reg(priv,
|
|
|
|
&priv->regs->ifregs[iface].data[i / 2]);
|
|
|
|
frame->data[i] = data;
|
|
|
|
frame->data[i + 1] = data >> 8;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
netif_receive_skb(skb);
|
|
|
|
|
|
|
|
stats->rx_packets++;
|
|
|
|
stats->rx_bytes += frame->can_dlc;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void c_can_setup_receive_object(struct net_device *dev, int iface,
|
|
|
|
int objno, unsigned int mask,
|
|
|
|
unsigned int id, unsigned int mcont)
|
|
|
|
{
|
|
|
|
struct c_can_priv *priv = netdev_priv(dev);
|
|
|
|
|
|
|
|
priv->write_reg(priv, &priv->regs->ifregs[iface].mask1,
|
|
|
|
IFX_WRITE_LOW_16BIT(mask));
|
|
|
|
priv->write_reg(priv, &priv->regs->ifregs[iface].mask2,
|
|
|
|
IFX_WRITE_HIGH_16BIT(mask));
|
|
|
|
|
|
|
|
priv->write_reg(priv, &priv->regs->ifregs[iface].arb1,
|
|
|
|
IFX_WRITE_LOW_16BIT(id));
|
|
|
|
priv->write_reg(priv, &priv->regs->ifregs[iface].arb2,
|
|
|
|
(IF_ARB_MSGVAL | IFX_WRITE_HIGH_16BIT(id)));
|
|
|
|
|
|
|
|
priv->write_reg(priv, &priv->regs->ifregs[iface].msg_cntrl, mcont);
|
|
|
|
c_can_object_put(dev, iface, objno, IF_COMM_ALL & ~IF_COMM_TXRQST);
|
|
|
|
|
|
|
|
netdev_dbg(dev, "obj no:%d, msgval:0x%08x\n", objno,
|
|
|
|
c_can_read_reg32(priv, &priv->regs->msgval1));
|
|
|
|
}
|
|
|
|
|
|
|
|
static void c_can_inval_msg_object(struct net_device *dev, int iface, int objno)
|
|
|
|
{
|
|
|
|
struct c_can_priv *priv = netdev_priv(dev);
|
|
|
|
|
|
|
|
priv->write_reg(priv, &priv->regs->ifregs[iface].arb1, 0);
|
|
|
|
priv->write_reg(priv, &priv->regs->ifregs[iface].arb2, 0);
|
|
|
|
priv->write_reg(priv, &priv->regs->ifregs[iface].msg_cntrl, 0);
|
|
|
|
|
|
|
|
c_can_object_put(dev, iface, objno, IF_COMM_ARB | IF_COMM_CONTROL);
|
|
|
|
|
|
|
|
netdev_dbg(dev, "obj no:%d, msgval:0x%08x\n", objno,
|
|
|
|
c_can_read_reg32(priv, &priv->regs->msgval1));
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline int c_can_is_next_tx_obj_busy(struct c_can_priv *priv, int objno)
|
|
|
|
{
|
|
|
|
int val = c_can_read_reg32(priv, &priv->regs->txrqst1);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* as transmission request register's bit n-1 corresponds to
|
|
|
|
* message object n, we need to handle the same properly.
|
|
|
|
*/
|
|
|
|
if (val & (1 << (objno - 1)))
|
|
|
|
return 1;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static netdev_tx_t c_can_start_xmit(struct sk_buff *skb,
|
|
|
|
struct net_device *dev)
|
|
|
|
{
|
|
|
|
u32 msg_obj_no;
|
|
|
|
struct c_can_priv *priv = netdev_priv(dev);
|
|
|
|
struct can_frame *frame = (struct can_frame *)skb->data;
|
|
|
|
|
|
|
|
if (can_dropped_invalid_skb(dev, skb))
|
|
|
|
return NETDEV_TX_OK;
|
|
|
|
|
|
|
|
msg_obj_no = get_tx_next_msg_obj(priv);
|
|
|
|
|
|
|
|
/* prepare message object for transmission */
|
|
|
|
c_can_write_msg_object(dev, 0, frame, msg_obj_no);
|
|
|
|
can_put_echo_skb(skb, dev, msg_obj_no - C_CAN_MSG_OBJ_TX_FIRST);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* we have to stop the queue in case of a wrap around or
|
|
|
|
* if the next TX message object is still in use
|
|
|
|
*/
|
|
|
|
priv->tx_next++;
|
|
|
|
if (c_can_is_next_tx_obj_busy(priv, get_tx_next_msg_obj(priv)) ||
|
|
|
|
(priv->tx_next & C_CAN_NEXT_MSG_OBJ_MASK) == 0)
|
|
|
|
netif_stop_queue(dev);
|
|
|
|
|
|
|
|
return NETDEV_TX_OK;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int c_can_set_bittiming(struct net_device *dev)
|
|
|
|
{
|
|
|
|
unsigned int reg_btr, reg_brpe, ctrl_save;
|
|
|
|
u8 brp, brpe, sjw, tseg1, tseg2;
|
|
|
|
u32 ten_bit_brp;
|
|
|
|
struct c_can_priv *priv = netdev_priv(dev);
|
|
|
|
const struct can_bittiming *bt = &priv->can.bittiming;
|
|
|
|
|
|
|
|
/* c_can provides a 6-bit brp and 4-bit brpe fields */
|
|
|
|
ten_bit_brp = bt->brp - 1;
|
|
|
|
brp = ten_bit_brp & BTR_BRP_MASK;
|
|
|
|
brpe = ten_bit_brp >> 6;
|
|
|
|
|
|
|
|
sjw = bt->sjw - 1;
|
|
|
|
tseg1 = bt->prop_seg + bt->phase_seg1 - 1;
|
|
|
|
tseg2 = bt->phase_seg2 - 1;
|
|
|
|
reg_btr = brp | (sjw << BTR_SJW_SHIFT) | (tseg1 << BTR_TSEG1_SHIFT) |
|
|
|
|
(tseg2 << BTR_TSEG2_SHIFT);
|
|
|
|
reg_brpe = brpe & BRP_EXT_BRPE_MASK;
|
|
|
|
|
|
|
|
netdev_info(dev,
|
|
|
|
"setting BTR=%04x BRPE=%04x\n", reg_btr, reg_brpe);
|
|
|
|
|
|
|
|
ctrl_save = priv->read_reg(priv, &priv->regs->control);
|
|
|
|
priv->write_reg(priv, &priv->regs->control,
|
|
|
|
ctrl_save | CONTROL_CCE | CONTROL_INIT);
|
|
|
|
priv->write_reg(priv, &priv->regs->btr, reg_btr);
|
|
|
|
priv->write_reg(priv, &priv->regs->brp_ext, reg_brpe);
|
|
|
|
priv->write_reg(priv, &priv->regs->control, ctrl_save);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Configure C_CAN message objects for Tx and Rx purposes:
|
|
|
|
* C_CAN provides a total of 32 message objects that can be configured
|
|
|
|
* either for Tx or Rx purposes. Here the first 16 message objects are used as
|
|
|
|
* a reception FIFO. The end of reception FIFO is signified by the EoB bit
|
|
|
|
* being SET. The remaining 16 message objects are kept aside for Tx purposes.
|
|
|
|
* See user guide document for further details on configuring message
|
|
|
|
* objects.
|
|
|
|
*/
|
|
|
|
static void c_can_configure_msg_objects(struct net_device *dev)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
|
|
|
|
/* first invalidate all message objects */
|
|
|
|
for (i = C_CAN_MSG_OBJ_RX_FIRST; i <= C_CAN_NO_OF_OBJECTS; i++)
|
|
|
|
c_can_inval_msg_object(dev, 0, i);
|
|
|
|
|
|
|
|
/* setup receive message objects */
|
|
|
|
for (i = C_CAN_MSG_OBJ_RX_FIRST; i < C_CAN_MSG_OBJ_RX_LAST; i++)
|
|
|
|
c_can_setup_receive_object(dev, 0, i, 0, 0,
|
|
|
|
(IF_MCONT_RXIE | IF_MCONT_UMASK) & ~IF_MCONT_EOB);
|
|
|
|
|
|
|
|
c_can_setup_receive_object(dev, 0, C_CAN_MSG_OBJ_RX_LAST, 0, 0,
|
|
|
|
IF_MCONT_EOB | IF_MCONT_RXIE | IF_MCONT_UMASK);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Configure C_CAN chip:
|
|
|
|
* - enable/disable auto-retransmission
|
|
|
|
* - set operating mode
|
|
|
|
* - configure message objects
|
|
|
|
*/
|
|
|
|
static void c_can_chip_config(struct net_device *dev)
|
|
|
|
{
|
|
|
|
struct c_can_priv *priv = netdev_priv(dev);
|
|
|
|
|
2011-03-23 20:34:32 -06:00
|
|
|
/* enable automatic retransmission */
|
|
|
|
priv->write_reg(priv, &priv->regs->control,
|
|
|
|
CONTROL_ENABLE_AR);
|
2011-02-13 23:51:44 -07:00
|
|
|
|
|
|
|
if (priv->can.ctrlmode & (CAN_CTRLMODE_LISTENONLY &
|
|
|
|
CAN_CTRLMODE_LOOPBACK)) {
|
|
|
|
/* loopback + silent mode : useful for hot self-test */
|
|
|
|
priv->write_reg(priv, &priv->regs->control, CONTROL_EIE |
|
|
|
|
CONTROL_SIE | CONTROL_IE | CONTROL_TEST);
|
|
|
|
priv->write_reg(priv, &priv->regs->test,
|
|
|
|
TEST_LBACK | TEST_SILENT);
|
|
|
|
} else if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK) {
|
|
|
|
/* loopback mode : useful for self-test function */
|
|
|
|
priv->write_reg(priv, &priv->regs->control, CONTROL_EIE |
|
|
|
|
CONTROL_SIE | CONTROL_IE | CONTROL_TEST);
|
|
|
|
priv->write_reg(priv, &priv->regs->test, TEST_LBACK);
|
|
|
|
} else if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY) {
|
|
|
|
/* silent mode : bus-monitoring mode */
|
|
|
|
priv->write_reg(priv, &priv->regs->control, CONTROL_EIE |
|
|
|
|
CONTROL_SIE | CONTROL_IE | CONTROL_TEST);
|
|
|
|
priv->write_reg(priv, &priv->regs->test, TEST_SILENT);
|
|
|
|
} else
|
|
|
|
/* normal mode*/
|
|
|
|
priv->write_reg(priv, &priv->regs->control,
|
|
|
|
CONTROL_EIE | CONTROL_SIE | CONTROL_IE);
|
|
|
|
|
|
|
|
/* configure message objects */
|
|
|
|
c_can_configure_msg_objects(dev);
|
|
|
|
|
|
|
|
/* set a `lec` value so that we can check for updates later */
|
|
|
|
priv->write_reg(priv, &priv->regs->status, LEC_UNUSED);
|
|
|
|
|
|
|
|
/* set bittiming params */
|
|
|
|
c_can_set_bittiming(dev);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void c_can_start(struct net_device *dev)
|
|
|
|
{
|
|
|
|
struct c_can_priv *priv = netdev_priv(dev);
|
|
|
|
|
|
|
|
/* basic c_can configuration */
|
|
|
|
c_can_chip_config(dev);
|
|
|
|
|
|
|
|
priv->can.state = CAN_STATE_ERROR_ACTIVE;
|
|
|
|
|
|
|
|
/* reset tx helper pointers */
|
|
|
|
priv->tx_next = priv->tx_echo = 0;
|
2011-03-21 19:19:26 -06:00
|
|
|
|
|
|
|
/* enable status change, error and module interrupts */
|
|
|
|
c_can_enable_all_interrupts(priv, ENABLE_ALL_INTERRUPTS);
|
2011-02-13 23:51:44 -07:00
|
|
|
}
|
|
|
|
|
|
|
|
static void c_can_stop(struct net_device *dev)
|
|
|
|
{
|
|
|
|
struct c_can_priv *priv = netdev_priv(dev);
|
|
|
|
|
|
|
|
/* disable all interrupts */
|
|
|
|
c_can_enable_all_interrupts(priv, DISABLE_ALL_INTERRUPTS);
|
|
|
|
|
|
|
|
/* set the state as STOPPED */
|
|
|
|
priv->can.state = CAN_STATE_STOPPED;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int c_can_set_mode(struct net_device *dev, enum can_mode mode)
|
|
|
|
{
|
|
|
|
switch (mode) {
|
|
|
|
case CAN_MODE_START:
|
|
|
|
c_can_start(dev);
|
|
|
|
netif_wake_queue(dev);
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
return -EOPNOTSUPP;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int c_can_get_berr_counter(const struct net_device *dev,
|
|
|
|
struct can_berr_counter *bec)
|
|
|
|
{
|
|
|
|
unsigned int reg_err_counter;
|
|
|
|
struct c_can_priv *priv = netdev_priv(dev);
|
|
|
|
|
|
|
|
reg_err_counter = priv->read_reg(priv, &priv->regs->err_cnt);
|
|
|
|
bec->rxerr = (reg_err_counter & ERR_CNT_REC_MASK) >>
|
|
|
|
ERR_CNT_REC_SHIFT;
|
|
|
|
bec->txerr = reg_err_counter & ERR_CNT_TEC_MASK;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* theory of operation:
|
|
|
|
*
|
|
|
|
* priv->tx_echo holds the number of the oldest can_frame put for
|
|
|
|
* transmission into the hardware, but not yet ACKed by the CAN tx
|
|
|
|
* complete IRQ.
|
|
|
|
*
|
|
|
|
* We iterate from priv->tx_echo to priv->tx_next and check if the
|
|
|
|
* packet has been transmitted, echo it back to the CAN framework.
|
|
|
|
* If we discover a not yet transmitted package, stop looking for more.
|
|
|
|
*/
|
|
|
|
static void c_can_do_tx(struct net_device *dev)
|
|
|
|
{
|
|
|
|
u32 val;
|
|
|
|
u32 msg_obj_no;
|
|
|
|
struct c_can_priv *priv = netdev_priv(dev);
|
|
|
|
struct net_device_stats *stats = &dev->stats;
|
|
|
|
|
|
|
|
for (/* nix */; (priv->tx_next - priv->tx_echo) > 0; priv->tx_echo++) {
|
|
|
|
msg_obj_no = get_tx_echo_msg_obj(priv);
|
|
|
|
val = c_can_read_reg32(priv, &priv->regs->txrqst1);
|
|
|
|
if (!(val & (1 << msg_obj_no))) {
|
|
|
|
can_get_echo_skb(dev,
|
|
|
|
msg_obj_no - C_CAN_MSG_OBJ_TX_FIRST);
|
|
|
|
stats->tx_bytes += priv->read_reg(priv,
|
|
|
|
&priv->regs->ifregs[0].msg_cntrl)
|
|
|
|
& IF_MCONT_DLC_MASK;
|
|
|
|
stats->tx_packets++;
|
2011-03-27 19:24:10 -06:00
|
|
|
c_can_inval_msg_object(dev, 0, msg_obj_no);
|
2011-02-13 23:51:44 -07:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* restart queue if wrap-up or if queue stalled on last pkt */
|
|
|
|
if (((priv->tx_next & C_CAN_NEXT_MSG_OBJ_MASK) != 0) ||
|
|
|
|
((priv->tx_echo & C_CAN_NEXT_MSG_OBJ_MASK) == 0))
|
|
|
|
netif_wake_queue(dev);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* theory of operation:
|
|
|
|
*
|
|
|
|
* c_can core saves a received CAN message into the first free message
|
|
|
|
* object it finds free (starting with the lowest). Bits NEWDAT and
|
|
|
|
* INTPND are set for this message object indicating that a new message
|
|
|
|
* has arrived. To work-around this issue, we keep two groups of message
|
|
|
|
* objects whose partitioning is defined by C_CAN_MSG_OBJ_RX_SPLIT.
|
|
|
|
*
|
|
|
|
* To ensure in-order frame reception we use the following
|
|
|
|
* approach while re-activating a message object to receive further
|
|
|
|
* frames:
|
|
|
|
* - if the current message object number is lower than
|
|
|
|
* C_CAN_MSG_RX_LOW_LAST, do not clear the NEWDAT bit while clearing
|
|
|
|
* the INTPND bit.
|
|
|
|
* - if the current message object number is equal to
|
|
|
|
* C_CAN_MSG_RX_LOW_LAST then clear the NEWDAT bit of all lower
|
|
|
|
* receive message objects.
|
|
|
|
* - if the current message object number is greater than
|
|
|
|
* C_CAN_MSG_RX_LOW_LAST then clear the NEWDAT bit of
|
|
|
|
* only this message object.
|
|
|
|
*/
|
|
|
|
static int c_can_do_rx_poll(struct net_device *dev, int quota)
|
|
|
|
{
|
|
|
|
u32 num_rx_pkts = 0;
|
|
|
|
unsigned int msg_obj, msg_ctrl_save;
|
|
|
|
struct c_can_priv *priv = netdev_priv(dev);
|
|
|
|
u32 val = c_can_read_reg32(priv, &priv->regs->intpnd1);
|
|
|
|
|
|
|
|
for (msg_obj = C_CAN_MSG_OBJ_RX_FIRST;
|
|
|
|
msg_obj <= C_CAN_MSG_OBJ_RX_LAST && quota > 0;
|
|
|
|
val = c_can_read_reg32(priv, &priv->regs->intpnd1),
|
|
|
|
msg_obj++) {
|
|
|
|
/*
|
|
|
|
* as interrupt pending register's bit n-1 corresponds to
|
|
|
|
* message object n, we need to handle the same properly.
|
|
|
|
*/
|
|
|
|
if (val & (1 << (msg_obj - 1))) {
|
|
|
|
c_can_object_get(dev, 0, msg_obj, IF_COMM_ALL &
|
|
|
|
~IF_COMM_TXRQST);
|
|
|
|
msg_ctrl_save = priv->read_reg(priv,
|
|
|
|
&priv->regs->ifregs[0].msg_cntrl);
|
|
|
|
|
|
|
|
if (msg_ctrl_save & IF_MCONT_EOB)
|
|
|
|
return num_rx_pkts;
|
|
|
|
|
|
|
|
if (msg_ctrl_save & IF_MCONT_MSGLST) {
|
|
|
|
c_can_handle_lost_msg_obj(dev, 0, msg_obj);
|
|
|
|
num_rx_pkts++;
|
|
|
|
quota--;
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!(msg_ctrl_save & IF_MCONT_NEWDAT))
|
|
|
|
continue;
|
|
|
|
|
|
|
|
/* read the data from the message object */
|
|
|
|
c_can_read_msg_object(dev, 0, msg_ctrl_save);
|
|
|
|
|
|
|
|
if (msg_obj < C_CAN_MSG_RX_LOW_LAST)
|
|
|
|
c_can_mark_rx_msg_obj(dev, 0,
|
|
|
|
msg_ctrl_save, msg_obj);
|
|
|
|
else if (msg_obj > C_CAN_MSG_RX_LOW_LAST)
|
|
|
|
/* activate this msg obj */
|
|
|
|
c_can_activate_rx_msg_obj(dev, 0,
|
|
|
|
msg_ctrl_save, msg_obj);
|
|
|
|
else if (msg_obj == C_CAN_MSG_RX_LOW_LAST)
|
|
|
|
/* activate all lower message objects */
|
|
|
|
c_can_activate_all_lower_rx_msg_obj(dev,
|
|
|
|
0, msg_ctrl_save);
|
|
|
|
|
|
|
|
num_rx_pkts++;
|
|
|
|
quota--;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return num_rx_pkts;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline int c_can_has_and_handle_berr(struct c_can_priv *priv)
|
|
|
|
{
|
|
|
|
return (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING) &&
|
|
|
|
(priv->current_status & LEC_UNUSED);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int c_can_handle_state_change(struct net_device *dev,
|
|
|
|
enum c_can_bus_error_types error_type)
|
|
|
|
{
|
|
|
|
unsigned int reg_err_counter;
|
|
|
|
unsigned int rx_err_passive;
|
|
|
|
struct c_can_priv *priv = netdev_priv(dev);
|
|
|
|
struct net_device_stats *stats = &dev->stats;
|
|
|
|
struct can_frame *cf;
|
|
|
|
struct sk_buff *skb;
|
|
|
|
struct can_berr_counter bec;
|
|
|
|
|
2011-03-30 19:57:33 -06:00
|
|
|
/* propagate the error condition to the CAN stack */
|
2011-02-13 23:51:44 -07:00
|
|
|
skb = alloc_can_err_skb(dev, &cf);
|
|
|
|
if (unlikely(!skb))
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
c_can_get_berr_counter(dev, &bec);
|
|
|
|
reg_err_counter = priv->read_reg(priv, &priv->regs->err_cnt);
|
|
|
|
rx_err_passive = (reg_err_counter & ERR_CNT_RP_MASK) >>
|
|
|
|
ERR_CNT_RP_SHIFT;
|
|
|
|
|
|
|
|
switch (error_type) {
|
|
|
|
case C_CAN_ERROR_WARNING:
|
|
|
|
/* error warning state */
|
|
|
|
priv->can.can_stats.error_warning++;
|
|
|
|
priv->can.state = CAN_STATE_ERROR_WARNING;
|
|
|
|
cf->can_id |= CAN_ERR_CRTL;
|
|
|
|
cf->data[1] = (bec.txerr > bec.rxerr) ?
|
|
|
|
CAN_ERR_CRTL_TX_WARNING :
|
|
|
|
CAN_ERR_CRTL_RX_WARNING;
|
|
|
|
cf->data[6] = bec.txerr;
|
|
|
|
cf->data[7] = bec.rxerr;
|
|
|
|
|
|
|
|
break;
|
|
|
|
case C_CAN_ERROR_PASSIVE:
|
|
|
|
/* error passive state */
|
|
|
|
priv->can.can_stats.error_passive++;
|
|
|
|
priv->can.state = CAN_STATE_ERROR_PASSIVE;
|
|
|
|
cf->can_id |= CAN_ERR_CRTL;
|
|
|
|
if (rx_err_passive)
|
|
|
|
cf->data[1] |= CAN_ERR_CRTL_RX_PASSIVE;
|
|
|
|
if (bec.txerr > 127)
|
|
|
|
cf->data[1] |= CAN_ERR_CRTL_TX_PASSIVE;
|
|
|
|
|
|
|
|
cf->data[6] = bec.txerr;
|
|
|
|
cf->data[7] = bec.rxerr;
|
|
|
|
break;
|
|
|
|
case C_CAN_BUS_OFF:
|
|
|
|
/* bus-off state */
|
|
|
|
priv->can.state = CAN_STATE_BUS_OFF;
|
|
|
|
cf->can_id |= CAN_ERR_BUSOFF;
|
|
|
|
/*
|
|
|
|
* disable all interrupts in bus-off mode to ensure that
|
|
|
|
* the CPU is not hogged down
|
|
|
|
*/
|
|
|
|
c_can_enable_all_interrupts(priv, DISABLE_ALL_INTERRUPTS);
|
|
|
|
can_bus_off(dev);
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
netif_receive_skb(skb);
|
|
|
|
stats->rx_packets++;
|
|
|
|
stats->rx_bytes += cf->can_dlc;
|
|
|
|
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int c_can_handle_bus_err(struct net_device *dev,
|
|
|
|
enum c_can_lec_type lec_type)
|
|
|
|
{
|
|
|
|
struct c_can_priv *priv = netdev_priv(dev);
|
|
|
|
struct net_device_stats *stats = &dev->stats;
|
|
|
|
struct can_frame *cf;
|
|
|
|
struct sk_buff *skb;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* early exit if no lec update or no error.
|
|
|
|
* no lec update means that no CAN bus event has been detected
|
|
|
|
* since CPU wrote 0x7 value to status reg.
|
|
|
|
*/
|
|
|
|
if (lec_type == LEC_UNUSED || lec_type == LEC_NO_ERROR)
|
|
|
|
return 0;
|
|
|
|
|
2011-03-30 19:57:33 -06:00
|
|
|
/* propagate the error condition to the CAN stack */
|
2011-02-13 23:51:44 -07:00
|
|
|
skb = alloc_can_err_skb(dev, &cf);
|
|
|
|
if (unlikely(!skb))
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* check for 'last error code' which tells us the
|
|
|
|
* type of the last error to occur on the CAN bus
|
|
|
|
*/
|
|
|
|
|
|
|
|
/* common for all type of bus errors */
|
|
|
|
priv->can.can_stats.bus_error++;
|
|
|
|
stats->rx_errors++;
|
|
|
|
cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
|
|
|
|
cf->data[2] |= CAN_ERR_PROT_UNSPEC;
|
|
|
|
|
|
|
|
switch (lec_type) {
|
|
|
|
case LEC_STUFF_ERROR:
|
|
|
|
netdev_dbg(dev, "stuff error\n");
|
|
|
|
cf->data[2] |= CAN_ERR_PROT_STUFF;
|
|
|
|
break;
|
|
|
|
case LEC_FORM_ERROR:
|
|
|
|
netdev_dbg(dev, "form error\n");
|
|
|
|
cf->data[2] |= CAN_ERR_PROT_FORM;
|
|
|
|
break;
|
|
|
|
case LEC_ACK_ERROR:
|
|
|
|
netdev_dbg(dev, "ack error\n");
|
|
|
|
cf->data[2] |= (CAN_ERR_PROT_LOC_ACK |
|
|
|
|
CAN_ERR_PROT_LOC_ACK_DEL);
|
|
|
|
break;
|
|
|
|
case LEC_BIT1_ERROR:
|
|
|
|
netdev_dbg(dev, "bit1 error\n");
|
|
|
|
cf->data[2] |= CAN_ERR_PROT_BIT1;
|
|
|
|
break;
|
|
|
|
case LEC_BIT0_ERROR:
|
|
|
|
netdev_dbg(dev, "bit0 error\n");
|
|
|
|
cf->data[2] |= CAN_ERR_PROT_BIT0;
|
|
|
|
break;
|
|
|
|
case LEC_CRC_ERROR:
|
|
|
|
netdev_dbg(dev, "CRC error\n");
|
|
|
|
cf->data[2] |= (CAN_ERR_PROT_LOC_CRC_SEQ |
|
|
|
|
CAN_ERR_PROT_LOC_CRC_DEL);
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* set a `lec` value so that we can check for updates later */
|
|
|
|
priv->write_reg(priv, &priv->regs->status, LEC_UNUSED);
|
|
|
|
|
|
|
|
netif_receive_skb(skb);
|
|
|
|
stats->rx_packets++;
|
|
|
|
stats->rx_bytes += cf->can_dlc;
|
|
|
|
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int c_can_poll(struct napi_struct *napi, int quota)
|
|
|
|
{
|
|
|
|
u16 irqstatus;
|
|
|
|
int lec_type = 0;
|
|
|
|
int work_done = 0;
|
|
|
|
struct net_device *dev = napi->dev;
|
|
|
|
struct c_can_priv *priv = netdev_priv(dev);
|
|
|
|
|
|
|
|
irqstatus = priv->read_reg(priv, &priv->regs->interrupt);
|
|
|
|
if (!irqstatus)
|
|
|
|
goto end;
|
|
|
|
|
|
|
|
/* status events have the highest priority */
|
|
|
|
if (irqstatus == STATUS_INTERRUPT) {
|
|
|
|
priv->current_status = priv->read_reg(priv,
|
|
|
|
&priv->regs->status);
|
|
|
|
|
|
|
|
/* handle Tx/Rx events */
|
|
|
|
if (priv->current_status & STATUS_TXOK)
|
|
|
|
priv->write_reg(priv, &priv->regs->status,
|
|
|
|
priv->current_status & ~STATUS_TXOK);
|
|
|
|
|
|
|
|
if (priv->current_status & STATUS_RXOK)
|
|
|
|
priv->write_reg(priv, &priv->regs->status,
|
|
|
|
priv->current_status & ~STATUS_RXOK);
|
|
|
|
|
|
|
|
/* handle state changes */
|
|
|
|
if ((priv->current_status & STATUS_EWARN) &&
|
|
|
|
(!(priv->last_status & STATUS_EWARN))) {
|
|
|
|
netdev_dbg(dev, "entered error warning state\n");
|
|
|
|
work_done += c_can_handle_state_change(dev,
|
|
|
|
C_CAN_ERROR_WARNING);
|
|
|
|
}
|
|
|
|
if ((priv->current_status & STATUS_EPASS) &&
|
|
|
|
(!(priv->last_status & STATUS_EPASS))) {
|
|
|
|
netdev_dbg(dev, "entered error passive state\n");
|
|
|
|
work_done += c_can_handle_state_change(dev,
|
|
|
|
C_CAN_ERROR_PASSIVE);
|
|
|
|
}
|
|
|
|
if ((priv->current_status & STATUS_BOFF) &&
|
|
|
|
(!(priv->last_status & STATUS_BOFF))) {
|
|
|
|
netdev_dbg(dev, "entered bus off state\n");
|
|
|
|
work_done += c_can_handle_state_change(dev,
|
|
|
|
C_CAN_BUS_OFF);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* handle bus recovery events */
|
|
|
|
if ((!(priv->current_status & STATUS_BOFF)) &&
|
|
|
|
(priv->last_status & STATUS_BOFF)) {
|
|
|
|
netdev_dbg(dev, "left bus off state\n");
|
|
|
|
priv->can.state = CAN_STATE_ERROR_ACTIVE;
|
|
|
|
}
|
|
|
|
if ((!(priv->current_status & STATUS_EPASS)) &&
|
|
|
|
(priv->last_status & STATUS_EPASS)) {
|
|
|
|
netdev_dbg(dev, "left error passive state\n");
|
|
|
|
priv->can.state = CAN_STATE_ERROR_ACTIVE;
|
|
|
|
}
|
|
|
|
|
|
|
|
priv->last_status = priv->current_status;
|
|
|
|
|
|
|
|
/* handle lec errors on the bus */
|
|
|
|
lec_type = c_can_has_and_handle_berr(priv);
|
|
|
|
if (lec_type)
|
|
|
|
work_done += c_can_handle_bus_err(dev, lec_type);
|
|
|
|
} else if ((irqstatus >= C_CAN_MSG_OBJ_RX_FIRST) &&
|
|
|
|
(irqstatus <= C_CAN_MSG_OBJ_RX_LAST)) {
|
|
|
|
/* handle events corresponding to receive message objects */
|
|
|
|
work_done += c_can_do_rx_poll(dev, (quota - work_done));
|
|
|
|
} else if ((irqstatus >= C_CAN_MSG_OBJ_TX_FIRST) &&
|
|
|
|
(irqstatus <= C_CAN_MSG_OBJ_TX_LAST)) {
|
|
|
|
/* handle events corresponding to transmit message objects */
|
|
|
|
c_can_do_tx(dev);
|
|
|
|
}
|
|
|
|
|
|
|
|
end:
|
|
|
|
if (work_done < quota) {
|
|
|
|
napi_complete(napi);
|
|
|
|
/* enable all IRQs */
|
|
|
|
c_can_enable_all_interrupts(priv, ENABLE_ALL_INTERRUPTS);
|
|
|
|
}
|
|
|
|
|
|
|
|
return work_done;
|
|
|
|
}
|
|
|
|
|
|
|
|
static irqreturn_t c_can_isr(int irq, void *dev_id)
|
|
|
|
{
|
|
|
|
u16 irqstatus;
|
|
|
|
struct net_device *dev = (struct net_device *)dev_id;
|
|
|
|
struct c_can_priv *priv = netdev_priv(dev);
|
|
|
|
|
|
|
|
irqstatus = priv->read_reg(priv, &priv->regs->interrupt);
|
|
|
|
if (!irqstatus)
|
|
|
|
return IRQ_NONE;
|
|
|
|
|
|
|
|
/* disable all interrupts and schedule the NAPI */
|
|
|
|
c_can_enable_all_interrupts(priv, DISABLE_ALL_INTERRUPTS);
|
|
|
|
napi_schedule(&priv->napi);
|
|
|
|
|
|
|
|
return IRQ_HANDLED;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int c_can_open(struct net_device *dev)
|
|
|
|
{
|
|
|
|
int err;
|
|
|
|
struct c_can_priv *priv = netdev_priv(dev);
|
|
|
|
|
|
|
|
/* open the can device */
|
|
|
|
err = open_candev(dev);
|
|
|
|
if (err) {
|
|
|
|
netdev_err(dev, "failed to open can device\n");
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* register interrupt handler */
|
|
|
|
err = request_irq(dev->irq, &c_can_isr, IRQF_SHARED, dev->name,
|
|
|
|
dev);
|
|
|
|
if (err < 0) {
|
|
|
|
netdev_err(dev, "failed to request interrupt\n");
|
|
|
|
goto exit_irq_fail;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* start the c_can controller */
|
|
|
|
c_can_start(dev);
|
|
|
|
|
|
|
|
napi_enable(&priv->napi);
|
|
|
|
netif_start_queue(dev);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
exit_irq_fail:
|
|
|
|
close_candev(dev);
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int c_can_close(struct net_device *dev)
|
|
|
|
{
|
|
|
|
struct c_can_priv *priv = netdev_priv(dev);
|
|
|
|
|
|
|
|
netif_stop_queue(dev);
|
|
|
|
napi_disable(&priv->napi);
|
|
|
|
c_can_stop(dev);
|
|
|
|
free_irq(dev->irq, dev);
|
|
|
|
close_candev(dev);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
struct net_device *alloc_c_can_dev(void)
|
|
|
|
{
|
|
|
|
struct net_device *dev;
|
|
|
|
struct c_can_priv *priv;
|
|
|
|
|
|
|
|
dev = alloc_candev(sizeof(struct c_can_priv), C_CAN_MSG_OBJ_TX_NUM);
|
|
|
|
if (!dev)
|
|
|
|
return NULL;
|
|
|
|
|
|
|
|
priv = netdev_priv(dev);
|
|
|
|
netif_napi_add(dev, &priv->napi, c_can_poll, C_CAN_NAPI_WEIGHT);
|
|
|
|
|
|
|
|
priv->dev = dev;
|
|
|
|
priv->can.bittiming_const = &c_can_bittiming_const;
|
|
|
|
priv->can.do_set_mode = c_can_set_mode;
|
|
|
|
priv->can.do_get_berr_counter = c_can_get_berr_counter;
|
2011-03-23 20:34:32 -06:00
|
|
|
priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK |
|
2011-02-13 23:51:44 -07:00
|
|
|
CAN_CTRLMODE_LISTENONLY |
|
|
|
|
CAN_CTRLMODE_BERR_REPORTING;
|
|
|
|
|
|
|
|
return dev;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(alloc_c_can_dev);
|
|
|
|
|
|
|
|
void free_c_can_dev(struct net_device *dev)
|
|
|
|
{
|
|
|
|
free_candev(dev);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(free_c_can_dev);
|
|
|
|
|
|
|
|
static const struct net_device_ops c_can_netdev_ops = {
|
|
|
|
.ndo_open = c_can_open,
|
|
|
|
.ndo_stop = c_can_close,
|
|
|
|
.ndo_start_xmit = c_can_start_xmit,
|
|
|
|
};
|
|
|
|
|
|
|
|
int register_c_can_dev(struct net_device *dev)
|
|
|
|
{
|
|
|
|
dev->flags |= IFF_ECHO; /* we support local echo */
|
|
|
|
dev->netdev_ops = &c_can_netdev_ops;
|
|
|
|
|
|
|
|
return register_candev(dev);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(register_c_can_dev);
|
|
|
|
|
|
|
|
void unregister_c_can_dev(struct net_device *dev)
|
|
|
|
{
|
|
|
|
struct c_can_priv *priv = netdev_priv(dev);
|
|
|
|
|
|
|
|
/* disable all interrupts */
|
|
|
|
c_can_enable_all_interrupts(priv, DISABLE_ALL_INTERRUPTS);
|
|
|
|
|
|
|
|
unregister_candev(dev);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(unregister_c_can_dev);
|
|
|
|
|
|
|
|
MODULE_AUTHOR("Bhupesh Sharma <bhupesh.sharma@st.com>");
|
|
|
|
MODULE_LICENSE("GPL v2");
|
|
|
|
MODULE_DESCRIPTION("CAN bus driver for Bosch C_CAN controller");
|