flexcan.c revision 61e271ee64f1da6f69e56419ecf2ca7330884564
1e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* 2e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * flexcan.c - FLEXCAN CAN controller driver 3e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 4e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * Copyright (c) 2005-2006 Varma Electronics Oy 5e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * Copyright (c) 2009 Sascha Hauer, Pengutronix 6e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * Copyright (c) 2010 Marc Kleine-Budde, Pengutronix 7e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 8e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * Based on code originally by Andrey Volkov <avolkov@varma-el.com> 9e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 10e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * LICENCE: 11e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * This program is free software; you can redistribute it and/or 12e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * modify it under the terms of the GNU General Public License as 13e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * published by the Free Software Foundation version 2. 14e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 15e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * This program is distributed in the hope that it will be useful, 16e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * but WITHOUT ANY WARRANTY; without even the implied warranty of 17e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * GNU General Public License for more details. 19e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 20e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 21e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 22e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#include <linux/netdevice.h> 23e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#include <linux/can.h> 24e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#include <linux/can/dev.h> 25e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#include <linux/can/error.h> 26e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#include <linux/can/platform/flexcan.h> 27e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#include <linux/clk.h> 28e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#include <linux/delay.h> 29e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#include <linux/if_arp.h> 30e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#include <linux/if_ether.h> 31e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#include <linux/interrupt.h> 32e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#include <linux/io.h> 33e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#include <linux/kernel.h> 34e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#include <linux/list.h> 35e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#include <linux/module.h> 36e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#include <linux/platform_device.h> 37e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 38e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define DRV_NAME "flexcan" 39e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 40e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* 8 for RX fifo and 2 error handling */ 41e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_NAPI_WEIGHT (8 + 2) 42e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 43e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* FLEXCAN module configuration register (CANMCR) bits */ 44e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_MDIS BIT(31) 45e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_FRZ BIT(30) 46e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_FEN BIT(29) 47e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_HALT BIT(28) 48e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_NOT_RDY BIT(27) 49e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_WAK_MSK BIT(26) 50e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_SOFTRST BIT(25) 51e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_FRZ_ACK BIT(24) 52e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_SUPV BIT(23) 53e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_SLF_WAK BIT(22) 54e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_WRN_EN BIT(21) 55e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_LPM_ACK BIT(20) 56e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_WAK_SRC BIT(19) 57e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_DOZE BIT(18) 58e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_SRX_DIS BIT(17) 59e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_BCC BIT(16) 60e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_LPRIO_EN BIT(13) 61e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_AEN BIT(12) 62e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_MAXMB(x) ((x) & 0xf) 63e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_IDAM_A (0 << 8) 64e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_IDAM_B (1 << 8) 65e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_IDAM_C (2 << 8) 66e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_IDAM_D (3 << 8) 67e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 68e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* FLEXCAN control register (CANCTRL) bits */ 69e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_PRESDIV(x) (((x) & 0xff) << 24) 70e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_RJW(x) (((x) & 0x03) << 22) 71e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_PSEG1(x) (((x) & 0x07) << 19) 72e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_PSEG2(x) (((x) & 0x07) << 16) 73e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_BOFF_MSK BIT(15) 74e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_ERR_MSK BIT(14) 75e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_CLK_SRC BIT(13) 76e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_LPB BIT(12) 77e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_TWRN_MSK BIT(11) 78e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_RWRN_MSK BIT(10) 79e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_SMP BIT(7) 80e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_BOFF_REC BIT(6) 81e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_TSYN BIT(5) 82e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_LBUF BIT(4) 83e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_LOM BIT(3) 84e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_PROPSEG(x) ((x) & 0x07) 85e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_ERR_BUS (FLEXCAN_CTRL_ERR_MSK) 86e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_ERR_STATE \ 87e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde (FLEXCAN_CTRL_TWRN_MSK | FLEXCAN_CTRL_RWRN_MSK | \ 88e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_BOFF_MSK) 89e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_ERR_ALL \ 90e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde (FLEXCAN_CTRL_ERR_BUS | FLEXCAN_CTRL_ERR_STATE) 91e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 92e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* FLEXCAN error and status register (ESR) bits */ 93e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_TWRN_INT BIT(17) 94e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_RWRN_INT BIT(16) 95e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_BIT1_ERR BIT(15) 96e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_BIT0_ERR BIT(14) 97e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_ACK_ERR BIT(13) 98e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_CRC_ERR BIT(12) 99e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_FRM_ERR BIT(11) 100e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_STF_ERR BIT(10) 101e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_TX_WRN BIT(9) 102e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_RX_WRN BIT(8) 103e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_IDLE BIT(7) 104e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_TXRX BIT(6) 105e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_EST_FLT_CONF_SHIFT (4) 106e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_FLT_CONF_MASK (0x3 << FLEXCAN_EST_FLT_CONF_SHIFT) 107e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_FLT_CONF_ACTIVE (0x0 << FLEXCAN_EST_FLT_CONF_SHIFT) 108e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_FLT_CONF_PASSIVE (0x1 << FLEXCAN_EST_FLT_CONF_SHIFT) 109e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_BOFF_INT BIT(2) 110e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_ERR_INT BIT(1) 111e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_WAK_INT BIT(0) 112e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_ERR_BUS \ 113e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde (FLEXCAN_ESR_BIT1_ERR | FLEXCAN_ESR_BIT0_ERR | \ 114e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_ESR_ACK_ERR | FLEXCAN_ESR_CRC_ERR | \ 115e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_ESR_FRM_ERR | FLEXCAN_ESR_STF_ERR) 116e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_ERR_STATE \ 117e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde (FLEXCAN_ESR_TWRN_INT | FLEXCAN_ESR_RWRN_INT | FLEXCAN_ESR_BOFF_INT) 118e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_ERR_ALL \ 119e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde (FLEXCAN_ESR_ERR_BUS | FLEXCAN_ESR_ERR_STATE) 120e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 121e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* FLEXCAN interrupt flag register (IFLAG) bits */ 122e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_TX_BUF_ID 8 123e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_IFLAG_BUF(x) BIT(x) 124e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_IFLAG_RX_FIFO_OVERFLOW BIT(7) 125e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_IFLAG_RX_FIFO_WARN BIT(6) 126e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_IFLAG_RX_FIFO_AVAILABLE BIT(5) 127e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_IFLAG_DEFAULT \ 128e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde (FLEXCAN_IFLAG_RX_FIFO_OVERFLOW | FLEXCAN_IFLAG_RX_FIFO_AVAILABLE | \ 129e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_IFLAG_BUF(FLEXCAN_TX_BUF_ID)) 130e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 131e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* FLEXCAN message buffers */ 132e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MB_CNT_CODE(x) (((x) & 0xf) << 24) 133e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MB_CNT_SRR BIT(22) 134e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MB_CNT_IDE BIT(21) 135e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MB_CNT_RTR BIT(20) 136e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MB_CNT_LENGTH(x) (((x) & 0xf) << 16) 137e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MB_CNT_TIMESTAMP(x) ((x) & 0xffff) 138e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 139e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MB_CODE_MASK (0xf0ffffff) 140e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 141e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* Structure of the message buffer */ 142e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestruct flexcan_mb { 143e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 can_ctrl; 144e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 can_id; 145e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 data[2]; 146e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde}; 147e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 148e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* Structure of the hardware registers */ 149e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestruct flexcan_regs { 150e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 mcr; /* 0x00 */ 151e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 ctrl; /* 0x04 */ 152e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 timer; /* 0x08 */ 153e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 _reserved1; /* 0x0c */ 154e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 rxgmask; /* 0x10 */ 155e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 rx14mask; /* 0x14 */ 156e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 rx15mask; /* 0x18 */ 157e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 ecr; /* 0x1c */ 158e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 esr; /* 0x20 */ 159e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 imask2; /* 0x24 */ 160e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 imask1; /* 0x28 */ 161e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 iflag2; /* 0x2c */ 162e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 iflag1; /* 0x30 */ 163e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 _reserved2[19]; 164e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_mb cantxfg[64]; 165e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde}; 166e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 167e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestruct flexcan_priv { 168e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct can_priv can; 169e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct net_device *dev; 170e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct napi_struct napi; 171e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 172e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde void __iomem *base; 173e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg_esr; 174e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg_ctrl_default; 175e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 176e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct clk *clk; 177e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_platform_data *pdata; 178e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde}; 179e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 180e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic struct can_bittiming_const flexcan_bittiming_const = { 181e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .name = DRV_NAME, 182e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .tseg1_min = 4, 183e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .tseg1_max = 16, 184e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .tseg2_min = 2, 185e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .tseg2_max = 8, 186e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .sjw_max = 4, 187e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .brp_min = 1, 188e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .brp_max = 256, 189e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .brp_inc = 1, 190e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde}; 191e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 192e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* 19361e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com * Abstract off the read/write for arm versus ppc. 19461e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com */ 19561e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com#if defined(__BIG_ENDIAN) 19661e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.comstatic inline u32 flexcan_read(void __iomem *addr) 19761e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com{ 19861e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com return in_be32(addr); 19961e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com} 20061e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com 20161e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.comstatic inline void flexcan_write(u32 val, void __iomem *addr) 20261e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com{ 20361e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com out_be32(addr, val); 20461e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com} 20561e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com#else 20661e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.comstatic inline u32 flexcan_read(void __iomem *addr) 20761e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com{ 20861e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com return readl(addr); 20961e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com} 21061e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com 21161e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.comstatic inline void flexcan_write(u32 val, void __iomem *addr) 21261e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com{ 21361e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com writel(val, addr); 21461e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com} 21561e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com#endif 21661e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com 21761e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com/* 218e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * Swtich transceiver on or off 219e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 220e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic void flexcan_transceiver_switch(const struct flexcan_priv *priv, int on) 221e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 222e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (priv->pdata && priv->pdata->transceiver_switch) 223e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->pdata->transceiver_switch(on); 224e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 225e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 226e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic inline int flexcan_has_and_handle_berr(const struct flexcan_priv *priv, 227e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg_esr) 228e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 229e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING) && 230e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde (reg_esr & FLEXCAN_ESR_ERR_BUS); 231e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 232e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 233e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic inline void flexcan_chip_enable(struct flexcan_priv *priv) 234e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 235e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 236e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg; 237e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 23861e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg = flexcan_read(®s->mcr); 239e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg &= ~FLEXCAN_MCR_MDIS; 24061e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(reg, ®s->mcr); 241e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 242e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde udelay(10); 243e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 244e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 245e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic inline void flexcan_chip_disable(struct flexcan_priv *priv) 246e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 247e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 248e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg; 249e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 25061e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg = flexcan_read(®s->mcr); 251e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg |= FLEXCAN_MCR_MDIS; 25261e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(reg, ®s->mcr); 253e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 254e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 255e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int flexcan_get_berr_counter(const struct net_device *dev, 256e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct can_berr_counter *bec) 257e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 258e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde const struct flexcan_priv *priv = netdev_priv(dev); 259e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 26061e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com u32 reg = flexcan_read(®s->ecr); 261e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 262e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde bec->txerr = (reg >> 0) & 0xff; 263e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde bec->rxerr = (reg >> 8) & 0xff; 264e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 265e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 266e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 267e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 268e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int flexcan_start_xmit(struct sk_buff *skb, struct net_device *dev) 269e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 270e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde const struct flexcan_priv *priv = netdev_priv(dev); 271e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct net_device_stats *stats = &dev->stats; 272e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 273e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct can_frame *cf = (struct can_frame *)skb->data; 274e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 can_id; 275e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 ctrl = FLEXCAN_MB_CNT_CODE(0xc) | (cf->can_dlc << 16); 276e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 277e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (can_dropped_invalid_skb(dev, skb)) 278e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return NETDEV_TX_OK; 279e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 280e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde netif_stop_queue(dev); 281e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 282e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (cf->can_id & CAN_EFF_FLAG) { 283e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde can_id = cf->can_id & CAN_EFF_MASK; 284e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde ctrl |= FLEXCAN_MB_CNT_IDE | FLEXCAN_MB_CNT_SRR; 285e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } else { 286e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde can_id = (cf->can_id & CAN_SFF_MASK) << 18; 287e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 288e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 289e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (cf->can_id & CAN_RTR_FLAG) 290e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde ctrl |= FLEXCAN_MB_CNT_RTR; 291e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 292e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (cf->can_dlc > 0) { 293e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 data = be32_to_cpup((__be32 *)&cf->data[0]); 29461e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(data, ®s->cantxfg[FLEXCAN_TX_BUF_ID].data[0]); 295e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 296e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (cf->can_dlc > 3) { 297e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 data = be32_to_cpup((__be32 *)&cf->data[4]); 29861e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(data, ®s->cantxfg[FLEXCAN_TX_BUF_ID].data[1]); 299e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 300e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 30161e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(can_id, ®s->cantxfg[FLEXCAN_TX_BUF_ID].can_id); 30261e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(ctrl, ®s->cantxfg[FLEXCAN_TX_BUF_ID].can_ctrl); 303e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 304e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde kfree_skb(skb); 305e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 306e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* tx_packets is incremented in flexcan_irq */ 307e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde stats->tx_bytes += cf->can_dlc; 308e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 309e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return NETDEV_TX_OK; 310e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 311e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 312e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic void do_bus_err(struct net_device *dev, 313e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct can_frame *cf, u32 reg_esr) 314e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 315e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv = netdev_priv(dev); 316e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde int rx_errors = 0, tx_errors = 0; 317e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 318e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR; 319e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 320e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (reg_esr & FLEXCAN_ESR_BIT1_ERR) { 321e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev_dbg(dev->dev.parent, "BIT1_ERR irq\n"); 322e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->data[2] |= CAN_ERR_PROT_BIT1; 323e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde tx_errors = 1; 324e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 325e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (reg_esr & FLEXCAN_ESR_BIT0_ERR) { 326e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev_dbg(dev->dev.parent, "BIT0_ERR irq\n"); 327e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->data[2] |= CAN_ERR_PROT_BIT0; 328e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde tx_errors = 1; 329e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 330e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (reg_esr & FLEXCAN_ESR_ACK_ERR) { 331e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev_dbg(dev->dev.parent, "ACK_ERR irq\n"); 332e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->can_id |= CAN_ERR_ACK; 333e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->data[3] |= CAN_ERR_PROT_LOC_ACK; 334e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde tx_errors = 1; 335e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 336e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (reg_esr & FLEXCAN_ESR_CRC_ERR) { 337e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev_dbg(dev->dev.parent, "CRC_ERR irq\n"); 338e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->data[2] |= CAN_ERR_PROT_BIT; 339e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->data[3] |= CAN_ERR_PROT_LOC_CRC_SEQ; 340e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde rx_errors = 1; 341e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 342e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (reg_esr & FLEXCAN_ESR_FRM_ERR) { 343e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev_dbg(dev->dev.parent, "FRM_ERR irq\n"); 344e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->data[2] |= CAN_ERR_PROT_FORM; 345e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde rx_errors = 1; 346e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 347e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (reg_esr & FLEXCAN_ESR_STF_ERR) { 348e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev_dbg(dev->dev.parent, "STF_ERR irq\n"); 349e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->data[2] |= CAN_ERR_PROT_STUFF; 350e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde rx_errors = 1; 351e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 352e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 353e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->can.can_stats.bus_error++; 354e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (rx_errors) 355e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev->stats.rx_errors++; 356e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (tx_errors) 357e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev->stats.tx_errors++; 358e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 359e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 360e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int flexcan_poll_bus_err(struct net_device *dev, u32 reg_esr) 361e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 362e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct sk_buff *skb; 363e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct can_frame *cf; 364e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 365e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde skb = alloc_can_err_skb(dev, &cf); 366e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (unlikely(!skb)) 367e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 368e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 369e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde do_bus_err(dev, cf, reg_esr); 370e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde netif_receive_skb(skb); 371e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 372e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev->stats.rx_packets++; 373e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev->stats.rx_bytes += cf->can_dlc; 374e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 375e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 1; 376e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 377e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 378e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic void do_state(struct net_device *dev, 379e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct can_frame *cf, enum can_state new_state) 380e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 381e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv = netdev_priv(dev); 382e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct can_berr_counter bec; 383e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 384e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flexcan_get_berr_counter(dev, &bec); 385e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 386e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde switch (priv->can.state) { 387e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde case CAN_STATE_ERROR_ACTIVE: 388e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* 389e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * from: ERROR_ACTIVE 390e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * to : ERROR_WARNING, ERROR_PASSIVE, BUS_OFF 391e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * => : there was a warning int 392e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 393e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (new_state >= CAN_STATE_ERROR_WARNING && 394e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde new_state <= CAN_STATE_BUS_OFF) { 395e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev_dbg(dev->dev.parent, "Error Warning IRQ\n"); 396e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->can.can_stats.error_warning++; 397e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 398e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->can_id |= CAN_ERR_CRTL; 399e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->data[1] = (bec.txerr > bec.rxerr) ? 400e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde CAN_ERR_CRTL_TX_WARNING : 401e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde CAN_ERR_CRTL_RX_WARNING; 402e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 403e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde case CAN_STATE_ERROR_WARNING: /* fallthrough */ 404e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* 405e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * from: ERROR_ACTIVE, ERROR_WARNING 406e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * to : ERROR_PASSIVE, BUS_OFF 407e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * => : error passive int 408e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 409e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (new_state >= CAN_STATE_ERROR_PASSIVE && 410e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde new_state <= CAN_STATE_BUS_OFF) { 411e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev_dbg(dev->dev.parent, "Error Passive IRQ\n"); 412e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->can.can_stats.error_passive++; 413e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 414e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->can_id |= CAN_ERR_CRTL; 415e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->data[1] = (bec.txerr > bec.rxerr) ? 416e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde CAN_ERR_CRTL_TX_PASSIVE : 417e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde CAN_ERR_CRTL_RX_PASSIVE; 418e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 419e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde break; 420e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde case CAN_STATE_BUS_OFF: 421e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev_err(dev->dev.parent, 422e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde "BUG! hardware recovered automatically from BUS_OFF\n"); 423e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde break; 424e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde default: 425e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde break; 426e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 427e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 428e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* process state changes depending on the new state */ 429e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde switch (new_state) { 430e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde case CAN_STATE_ERROR_ACTIVE: 431e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev_dbg(dev->dev.parent, "Error Active\n"); 432e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->can_id |= CAN_ERR_PROT; 433e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->data[2] = CAN_ERR_PROT_ACTIVE; 434e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde break; 435e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde case CAN_STATE_BUS_OFF: 436e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->can_id |= CAN_ERR_BUSOFF; 437e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde can_bus_off(dev); 438e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde break; 439e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde default: 440e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde break; 441e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 442e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 443e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 444e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int flexcan_poll_state(struct net_device *dev, u32 reg_esr) 445e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 446e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv = netdev_priv(dev); 447e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct sk_buff *skb; 448e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct can_frame *cf; 449e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde enum can_state new_state; 450e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde int flt; 451e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 452e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flt = reg_esr & FLEXCAN_ESR_FLT_CONF_MASK; 453e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (likely(flt == FLEXCAN_ESR_FLT_CONF_ACTIVE)) { 454e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (likely(!(reg_esr & (FLEXCAN_ESR_TX_WRN | 455e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_ESR_RX_WRN)))) 456e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde new_state = CAN_STATE_ERROR_ACTIVE; 457e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde else 458e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde new_state = CAN_STATE_ERROR_WARNING; 459e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } else if (unlikely(flt == FLEXCAN_ESR_FLT_CONF_PASSIVE)) 460e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde new_state = CAN_STATE_ERROR_PASSIVE; 461e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde else 462e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde new_state = CAN_STATE_BUS_OFF; 463e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 464e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* state hasn't changed */ 465e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (likely(new_state == priv->can.state)) 466e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 467e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 468e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde skb = alloc_can_err_skb(dev, &cf); 469e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (unlikely(!skb)) 470e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 471e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 472e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde do_state(dev, cf, new_state); 473e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->can.state = new_state; 474e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde netif_receive_skb(skb); 475e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 476e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev->stats.rx_packets++; 477e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev->stats.rx_bytes += cf->can_dlc; 478e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 479e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 1; 480e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 481e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 482e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic void flexcan_read_fifo(const struct net_device *dev, 483e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct can_frame *cf) 484e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 485e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde const struct flexcan_priv *priv = netdev_priv(dev); 486e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 487e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_mb __iomem *mb = ®s->cantxfg[0]; 488e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg_ctrl, reg_id; 489e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 49061e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg_ctrl = flexcan_read(&mb->can_ctrl); 49161e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg_id = flexcan_read(&mb->can_id); 492e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (reg_ctrl & FLEXCAN_MB_CNT_IDE) 493e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->can_id = ((reg_id >> 0) & CAN_EFF_MASK) | CAN_EFF_FLAG; 494e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde else 495e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->can_id = (reg_id >> 18) & CAN_SFF_MASK; 496e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 497e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (reg_ctrl & FLEXCAN_MB_CNT_RTR) 498e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->can_id |= CAN_RTR_FLAG; 499e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->can_dlc = get_can_dlc((reg_ctrl >> 16) & 0xf); 500e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 50161e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com *(__be32 *)(cf->data + 0) = cpu_to_be32(flexcan_read(&mb->data[0])); 50261e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com *(__be32 *)(cf->data + 4) = cpu_to_be32(flexcan_read(&mb->data[1])); 503e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 504e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* mark as read */ 50561e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(FLEXCAN_IFLAG_RX_FIFO_AVAILABLE, ®s->iflag1); 50661e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_read(®s->timer); 507e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 508e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 509e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int flexcan_read_frame(struct net_device *dev) 510e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 511e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct net_device_stats *stats = &dev->stats; 512e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct can_frame *cf; 513e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct sk_buff *skb; 514e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 515e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde skb = alloc_can_skb(dev, &cf); 516e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (unlikely(!skb)) { 517e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde stats->rx_dropped++; 518e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 519e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 520e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 521e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flexcan_read_fifo(dev, cf); 522e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde netif_receive_skb(skb); 523e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 524e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde stats->rx_packets++; 525e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde stats->rx_bytes += cf->can_dlc; 526e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 527e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 1; 528e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 529e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 530e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int flexcan_poll(struct napi_struct *napi, int quota) 531e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 532e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct net_device *dev = napi->dev; 533e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde const struct flexcan_priv *priv = netdev_priv(dev); 534e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 535e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg_iflag1, reg_esr; 536e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde int work_done = 0; 537e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 538e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* 539e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * The error bits are cleared on read, 540e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * use saved value from irq handler. 541e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 54261e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg_esr = flexcan_read(®s->esr) | priv->reg_esr; 543e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 544e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* handle state changes */ 545e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde work_done += flexcan_poll_state(dev, reg_esr); 546e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 547e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* handle RX-FIFO */ 54861e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg_iflag1 = flexcan_read(®s->iflag1); 549e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde while (reg_iflag1 & FLEXCAN_IFLAG_RX_FIFO_AVAILABLE && 550e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde work_done < quota) { 551e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde work_done += flexcan_read_frame(dev); 55261e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg_iflag1 = flexcan_read(®s->iflag1); 553e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 554e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 555e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* report bus errors */ 556e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (flexcan_has_and_handle_berr(priv, reg_esr) && work_done < quota) 557e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde work_done += flexcan_poll_bus_err(dev, reg_esr); 558e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 559e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (work_done < quota) { 560e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde napi_complete(napi); 561e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* enable IRQs */ 56261e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(FLEXCAN_IFLAG_DEFAULT, ®s->imask1); 56361e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(priv->reg_ctrl_default, ®s->ctrl); 564e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 565e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 566e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return work_done; 567e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 568e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 569e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic irqreturn_t flexcan_irq(int irq, void *dev_id) 570e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 571e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct net_device *dev = dev_id; 572e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct net_device_stats *stats = &dev->stats; 573e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv = netdev_priv(dev); 574e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 575e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg_iflag1, reg_esr; 576e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 57761e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg_iflag1 = flexcan_read(®s->iflag1); 57861e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg_esr = flexcan_read(®s->esr); 57961e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(FLEXCAN_ESR_ERR_INT, ®s->esr); /* ACK err IRQ */ 580e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 581e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* 582e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * schedule NAPI in case of: 583e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * - rx IRQ 584e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * - state change IRQ 585e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * - bus error IRQ and bus error reporting is activated 586e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 587e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if ((reg_iflag1 & FLEXCAN_IFLAG_RX_FIFO_AVAILABLE) || 588e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde (reg_esr & FLEXCAN_ESR_ERR_STATE) || 589e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flexcan_has_and_handle_berr(priv, reg_esr)) { 590e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* 591e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * The error bits are cleared on read, 592e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * save them for later use. 593e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 594e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->reg_esr = reg_esr & FLEXCAN_ESR_ERR_BUS; 59561e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(FLEXCAN_IFLAG_DEFAULT & 59661e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com ~FLEXCAN_IFLAG_RX_FIFO_AVAILABLE, ®s->imask1); 59761e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(priv->reg_ctrl_default & ~FLEXCAN_CTRL_ERR_ALL, 598e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde ®s->ctrl); 599e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde napi_schedule(&priv->napi); 600e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 601e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 602e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* FIFO overflow */ 603e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (reg_iflag1 & FLEXCAN_IFLAG_RX_FIFO_OVERFLOW) { 60461e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(FLEXCAN_IFLAG_RX_FIFO_OVERFLOW, ®s->iflag1); 605e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev->stats.rx_over_errors++; 606e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev->stats.rx_errors++; 607e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 608e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 609e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* transmission complete interrupt */ 610e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (reg_iflag1 & (1 << FLEXCAN_TX_BUF_ID)) { 611e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* tx_bytes is incremented in flexcan_start_xmit */ 612e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde stats->tx_packets++; 61361e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write((1 << FLEXCAN_TX_BUF_ID), ®s->iflag1); 614e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde netif_wake_queue(dev); 615e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 616e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 617e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return IRQ_HANDLED; 618e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 619e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 620e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic void flexcan_set_bittiming(struct net_device *dev) 621e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 622e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde const struct flexcan_priv *priv = netdev_priv(dev); 623e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde const struct can_bittiming *bt = &priv->can.bittiming; 624e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 625e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg; 626e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 62761e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg = flexcan_read(®s->ctrl); 628e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg &= ~(FLEXCAN_CTRL_PRESDIV(0xff) | 629e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_RJW(0x3) | 630e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_PSEG1(0x7) | 631e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_PSEG2(0x7) | 632e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_PROPSEG(0x7) | 633e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_LPB | 634e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_SMP | 635e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_LOM); 636e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 637e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg |= FLEXCAN_CTRL_PRESDIV(bt->brp - 1) | 638e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_PSEG1(bt->phase_seg1 - 1) | 639e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_PSEG2(bt->phase_seg2 - 1) | 640e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_RJW(bt->sjw - 1) | 641e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_PROPSEG(bt->prop_seg - 1); 642e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 643e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK) 644e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg |= FLEXCAN_CTRL_LPB; 645e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY) 646e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg |= FLEXCAN_CTRL_LOM; 647e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) 648e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg |= FLEXCAN_CTRL_SMP; 649e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 650e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev_info(dev->dev.parent, "writing ctrl=0x%08x\n", reg); 65161e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(reg, ®s->ctrl); 652e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 653e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* print chip status */ 654e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev_dbg(dev->dev.parent, "%s: mcr=0x%08x ctrl=0x%08x\n", __func__, 65561e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_read(®s->mcr), flexcan_read(®s->ctrl)); 656e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 657e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 658e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* 659e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * flexcan_chip_start 660e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 661e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * this functions is entered with clocks enabled 662e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 663e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 664e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int flexcan_chip_start(struct net_device *dev) 665e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 666e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv = netdev_priv(dev); 667e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 668e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde unsigned int i; 669e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde int err; 670e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg_mcr, reg_ctrl; 671e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 672e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* enable module */ 673e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flexcan_chip_enable(priv); 674e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 675e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* soft reset */ 67661e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(FLEXCAN_MCR_SOFTRST, ®s->mcr); 677e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde udelay(10); 678e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 67961e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg_mcr = flexcan_read(®s->mcr); 680e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (reg_mcr & FLEXCAN_MCR_SOFTRST) { 681e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev_err(dev->dev.parent, 682e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde "Failed to softreset can module (mcr=0x%08x)\n", 683e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg_mcr); 684e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = -ENODEV; 685e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde goto out; 686e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 687e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 688e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flexcan_set_bittiming(dev); 689e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 690e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* 691e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * MCR 692e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 693e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * enable freeze 694e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * enable fifo 695e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * halt now 696e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * only supervisor access 697e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * enable warning int 698e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * choose format C 699e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 700e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 70161e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg_mcr = flexcan_read(®s->mcr); 702e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg_mcr |= FLEXCAN_MCR_FRZ | FLEXCAN_MCR_FEN | FLEXCAN_MCR_HALT | 703e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_MCR_SUPV | FLEXCAN_MCR_WRN_EN | 704e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_MCR_IDAM_C; 705e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev_dbg(dev->dev.parent, "%s: writing mcr=0x%08x", __func__, reg_mcr); 70661e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(reg_mcr, ®s->mcr); 707e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 708e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* 709e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * CTRL 710e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 711e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * disable timer sync feature 712e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 713e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * disable auto busoff recovery 714e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * transmit lowest buffer first 715e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 716e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * enable tx and rx warning interrupt 717e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * enable bus off interrupt 718e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * (== FLEXCAN_CTRL_ERR_STATE) 719e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 720e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * _note_: we enable the "error interrupt" 721e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * (FLEXCAN_CTRL_ERR_MSK), too. Otherwise we don't get any 722e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * warning or bus passive interrupts. 723e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 72461e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg_ctrl = flexcan_read(®s->ctrl); 725e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg_ctrl &= ~FLEXCAN_CTRL_TSYN; 726e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg_ctrl |= FLEXCAN_CTRL_BOFF_REC | FLEXCAN_CTRL_LBUF | 727e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_ERR_STATE | FLEXCAN_CTRL_ERR_MSK; 728e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 729e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* save for later use */ 730e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->reg_ctrl_default = reg_ctrl; 731e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev_dbg(dev->dev.parent, "%s: writing ctrl=0x%08x", __func__, reg_ctrl); 73261e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(reg_ctrl, ®s->ctrl); 733e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 734e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde for (i = 0; i < ARRAY_SIZE(regs->cantxfg); i++) { 73561e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(0, ®s->cantxfg[i].can_ctrl); 73661e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(0, ®s->cantxfg[i].can_id); 73761e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(0, ®s->cantxfg[i].data[0]); 73861e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(0, ®s->cantxfg[i].data[1]); 739e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 740e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* put MB into rx queue */ 74161e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(FLEXCAN_MB_CNT_CODE(0x4), 74261e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com ®s->cantxfg[i].can_ctrl); 743e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 744e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 745e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* acceptance mask/acceptance code (accept everything) */ 74661e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(0x0, ®s->rxgmask); 74761e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(0x0, ®s->rx14mask); 74861e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(0x0, ®s->rx15mask); 749e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 750e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flexcan_transceiver_switch(priv, 1); 751e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 752e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* synchronize with the can bus */ 75361e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg_mcr = flexcan_read(®s->mcr); 754e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg_mcr &= ~FLEXCAN_MCR_HALT; 75561e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(reg_mcr, ®s->mcr); 756e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 757e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->can.state = CAN_STATE_ERROR_ACTIVE; 758e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 759e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* enable FIFO interrupts */ 76061e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(FLEXCAN_IFLAG_DEFAULT, ®s->imask1); 761e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 762e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* print chip status */ 763e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev_dbg(dev->dev.parent, "%s: reading mcr=0x%08x ctrl=0x%08x\n", 76461e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com __func__, flexcan_read(®s->mcr), flexcan_read(®s->ctrl)); 765e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 766e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 767e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 768e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde out: 769e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flexcan_chip_disable(priv); 770e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return err; 771e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 772e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 773e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* 774e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * flexcan_chip_stop 775e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 776e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * this functions is entered with clocks enabled 777e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 778e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 779e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic void flexcan_chip_stop(struct net_device *dev) 780e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 781e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv = netdev_priv(dev); 782e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 783e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg; 784e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 785e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* Disable all interrupts */ 78661e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(0, ®s->imask1); 787e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 788e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* Disable + halt module */ 78961e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg = flexcan_read(®s->mcr); 790e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg |= FLEXCAN_MCR_MDIS | FLEXCAN_MCR_HALT; 79161e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(reg, ®s->mcr); 792e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 793e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flexcan_transceiver_switch(priv, 0); 794e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->can.state = CAN_STATE_STOPPED; 795e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 796e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return; 797e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 798e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 799e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int flexcan_open(struct net_device *dev) 800e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 801e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv = netdev_priv(dev); 802e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde int err; 803e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 804e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde clk_enable(priv->clk); 805e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 806e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = open_candev(dev); 807e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (err) 808e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde goto out; 809e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 810e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = request_irq(dev->irq, flexcan_irq, IRQF_SHARED, dev->name, dev); 811e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (err) 812e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde goto out_close; 813e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 814e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* start chip and queuing */ 815e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = flexcan_chip_start(dev); 816e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (err) 817e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde goto out_close; 818e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde napi_enable(&priv->napi); 819e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde netif_start_queue(dev); 820e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 821e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 822e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 823e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde out_close: 824e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde close_candev(dev); 825e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde out: 826e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde clk_disable(priv->clk); 827e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 828e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return err; 829e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 830e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 831e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int flexcan_close(struct net_device *dev) 832e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 833e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv = netdev_priv(dev); 834e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 835e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde netif_stop_queue(dev); 836e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde napi_disable(&priv->napi); 837e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flexcan_chip_stop(dev); 838e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 839e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde free_irq(dev->irq, dev); 840e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde clk_disable(priv->clk); 841e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 842e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde close_candev(dev); 843e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 844e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 845e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 846e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 847e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int flexcan_set_mode(struct net_device *dev, enum can_mode mode) 848e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 849e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde int err; 850e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 851e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde switch (mode) { 852e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde case CAN_MODE_START: 853e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = flexcan_chip_start(dev); 854e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (err) 855e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return err; 856e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 857e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde netif_wake_queue(dev); 858e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde break; 859e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 860e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde default: 861e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return -EOPNOTSUPP; 862e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 863e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 864e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 865e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 866e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 867e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic const struct net_device_ops flexcan_netdev_ops = { 868e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .ndo_open = flexcan_open, 869e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .ndo_stop = flexcan_close, 870e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .ndo_start_xmit = flexcan_start_xmit, 871e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde}; 872e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 873e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int __devinit register_flexcandev(struct net_device *dev) 874e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 875e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv = netdev_priv(dev); 876e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 877e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg, err; 878e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 879e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde clk_enable(priv->clk); 880e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 881e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* select "bus clock", chip must be disabled */ 882e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flexcan_chip_disable(priv); 88361e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg = flexcan_read(®s->ctrl); 884e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg |= FLEXCAN_CTRL_CLK_SRC; 88561e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(reg, ®s->ctrl); 886e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 887e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flexcan_chip_enable(priv); 888e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 889e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* set freeze, halt and activate FIFO, restrict register access */ 89061e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg = flexcan_read(®s->mcr); 891e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg |= FLEXCAN_MCR_FRZ | FLEXCAN_MCR_HALT | 892e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_MCR_FEN | FLEXCAN_MCR_SUPV; 89361e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(reg, ®s->mcr); 894e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 895e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* 896e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * Currently we only support newer versions of this core 897e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * featuring a RX FIFO. Older cores found on some Coldfire 898e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * derivates are not yet supported. 899e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 90061e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg = flexcan_read(®s->mcr); 901e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (!(reg & FLEXCAN_MCR_FEN)) { 902e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev_err(dev->dev.parent, 903e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde "Could not enable RX FIFO, unsupported core\n"); 904e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = -ENODEV; 905e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde goto out; 906e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 907e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 908e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = register_candev(dev); 909e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 910e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde out: 911e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* disable core and turn off clocks */ 912e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flexcan_chip_disable(priv); 913e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde clk_disable(priv->clk); 914e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 915e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return err; 916e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 917e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 918e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic void __devexit unregister_flexcandev(struct net_device *dev) 919e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 920e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde unregister_candev(dev); 921e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 922e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 923e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int __devinit flexcan_probe(struct platform_device *pdev) 924e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 925e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct net_device *dev; 926e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv; 927e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct resource *mem; 928e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct clk *clk; 929e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde void __iomem *base; 930e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde resource_size_t mem_size; 931e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde int err, irq; 932e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 933e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde clk = clk_get(&pdev->dev, NULL); 934e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (IS_ERR(clk)) { 935e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev_err(&pdev->dev, "no clock defined\n"); 936e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = PTR_ERR(clk); 937e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde goto failed_clock; 938e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 939e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 940e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 941e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde irq = platform_get_irq(pdev, 0); 942e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (!mem || irq <= 0) { 943e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = -ENODEV; 944e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde goto failed_get; 945e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 946e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 947e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde mem_size = resource_size(mem); 948e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (!request_mem_region(mem->start, mem_size, pdev->name)) { 949e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = -EBUSY; 9502e4ceec4edaef6e903422792de4f7f37de98cec6Julia Lawall goto failed_get; 951e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 952e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 953e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde base = ioremap(mem->start, mem_size); 954e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (!base) { 955e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = -ENOMEM; 956e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde goto failed_map; 957e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 958e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 959e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev = alloc_candev(sizeof(struct flexcan_priv), 0); 960e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (!dev) { 961e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = -ENOMEM; 962e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde goto failed_alloc; 963e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 964e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 965e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev->netdev_ops = &flexcan_netdev_ops; 966e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev->irq = irq; 967e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev->flags |= IFF_ECHO; /* we support local echo in hardware */ 968e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 969e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv = netdev_priv(dev); 970e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->can.clock.freq = clk_get_rate(clk); 971e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->can.bittiming_const = &flexcan_bittiming_const; 972e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->can.do_set_mode = flexcan_set_mode; 973e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->can.do_get_berr_counter = flexcan_get_berr_counter; 974e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK | 975e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde CAN_CTRLMODE_LISTENONLY | CAN_CTRLMODE_3_SAMPLES | 976e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde CAN_CTRLMODE_BERR_REPORTING; 977e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->base = base; 978e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->dev = dev; 979e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->clk = clk; 980e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->pdata = pdev->dev.platform_data; 981e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 982e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde netif_napi_add(dev, &priv->napi, flexcan_poll, FLEXCAN_NAPI_WEIGHT); 983e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 984e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev_set_drvdata(&pdev->dev, dev); 985e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde SET_NETDEV_DEV(dev, &pdev->dev); 986e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 987e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = register_flexcandev(dev); 988e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (err) { 989e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev_err(&pdev->dev, "registering netdev failed\n"); 990e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde goto failed_register; 991e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 992e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 993e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev_info(&pdev->dev, "device registered (reg_base=%p, irq=%d)\n", 994e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->base, dev->irq); 995e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 996e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 997e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 998e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde failed_register: 999e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde free_candev(dev); 1000e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde failed_alloc: 1001e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde iounmap(base); 1002e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde failed_map: 1003e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde release_mem_region(mem->start, mem_size); 1004e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde failed_get: 10052e4ceec4edaef6e903422792de4f7f37de98cec6Julia Lawall clk_put(clk); 1006e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde failed_clock: 1007e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return err; 1008e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 1009e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1010e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int __devexit flexcan_remove(struct platform_device *pdev) 1011e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 1012e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct net_device *dev = platform_get_drvdata(pdev); 1013e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv = netdev_priv(dev); 1014e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct resource *mem; 1015e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1016e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde unregister_flexcandev(dev); 1017e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde platform_set_drvdata(pdev, NULL); 1018e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde iounmap(priv->base); 1019e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1020e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1021e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde release_mem_region(mem->start, resource_size(mem)); 1022e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1023e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde clk_put(priv->clk); 1024e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 10259a27586d3d5c3157260b055d057c6f4f6654c72cMarc Kleine-Budde free_candev(dev); 10269a27586d3d5c3157260b055d057c6f4f6654c72cMarc Kleine-Budde 1027e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 1028e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 1029e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1030e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic struct platform_driver flexcan_driver = { 1031e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .driver.name = DRV_NAME, 1032e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .probe = flexcan_probe, 1033e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .remove = __devexit_p(flexcan_remove), 1034e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde}; 1035e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1036e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int __init flexcan_init(void) 1037e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 1038e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde pr_info("%s netdevice driver\n", DRV_NAME); 1039e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return platform_driver_register(&flexcan_driver); 1040e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 1041e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1042e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic void __exit flexcan_exit(void) 1043e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 1044e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde platform_driver_unregister(&flexcan_driver); 1045e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde pr_info("%s: driver removed\n", DRV_NAME); 1046e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 1047e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1048e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddemodule_init(flexcan_init); 1049e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddemodule_exit(flexcan_exit); 1050e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1051e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-BuddeMODULE_AUTHOR("Sascha Hauer <kernel@pengutronix.de>, " 1052e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde "Marc Kleine-Budde <kernel@pengutronix.de>"); 1053e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-BuddeMODULE_LICENSE("GPL v2"); 1054e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-BuddeMODULE_DESCRIPTION("CAN port driver for flexcan based chip"); 1055