flexcan.c revision 8b5e218d8caa7592d26e68157bd71f50426bb7ae
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> 3697efe9aef1ae8922666d32f28d712745a86859e9holt@sgi.com#include <linux/of.h> 37e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#include <linux/platform_device.h> 38e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 39e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define DRV_NAME "flexcan" 40e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 41e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* 8 for RX fifo and 2 error handling */ 42e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_NAPI_WEIGHT (8 + 2) 43e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 44e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* FLEXCAN module configuration register (CANMCR) bits */ 45e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_MDIS BIT(31) 46e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_FRZ BIT(30) 47e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_FEN BIT(29) 48e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_HALT BIT(28) 49e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_NOT_RDY BIT(27) 50e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_WAK_MSK BIT(26) 51e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_SOFTRST BIT(25) 52e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_FRZ_ACK BIT(24) 53e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_SUPV BIT(23) 54e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_SLF_WAK BIT(22) 55e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_WRN_EN BIT(21) 56e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_LPM_ACK BIT(20) 57e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_WAK_SRC BIT(19) 58e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_DOZE BIT(18) 59e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_SRX_DIS BIT(17) 60e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_BCC BIT(16) 61e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_LPRIO_EN BIT(13) 62e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_AEN BIT(12) 63e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_MAXMB(x) ((x) & 0xf) 64e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_IDAM_A (0 << 8) 65e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_IDAM_B (1 << 8) 66e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_IDAM_C (2 << 8) 67e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_IDAM_D (3 << 8) 68e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 69e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* FLEXCAN control register (CANCTRL) bits */ 70e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_PRESDIV(x) (((x) & 0xff) << 24) 71e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_RJW(x) (((x) & 0x03) << 22) 72e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_PSEG1(x) (((x) & 0x07) << 19) 73e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_PSEG2(x) (((x) & 0x07) << 16) 74e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_BOFF_MSK BIT(15) 75e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_ERR_MSK BIT(14) 76e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_CLK_SRC BIT(13) 77e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_LPB BIT(12) 78e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_TWRN_MSK BIT(11) 79e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_RWRN_MSK BIT(10) 80e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_SMP BIT(7) 81e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_BOFF_REC BIT(6) 82e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_TSYN BIT(5) 83e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_LBUF BIT(4) 84e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_LOM BIT(3) 85e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_PROPSEG(x) ((x) & 0x07) 86e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_ERR_BUS (FLEXCAN_CTRL_ERR_MSK) 87e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_ERR_STATE \ 88e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde (FLEXCAN_CTRL_TWRN_MSK | FLEXCAN_CTRL_RWRN_MSK | \ 89e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_BOFF_MSK) 90e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_ERR_ALL \ 91e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde (FLEXCAN_CTRL_ERR_BUS | FLEXCAN_CTRL_ERR_STATE) 92e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 93e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* FLEXCAN error and status register (ESR) bits */ 94e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_TWRN_INT BIT(17) 95e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_RWRN_INT BIT(16) 96e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_BIT1_ERR BIT(15) 97e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_BIT0_ERR BIT(14) 98e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_ACK_ERR BIT(13) 99e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_CRC_ERR BIT(12) 100e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_FRM_ERR BIT(11) 101e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_STF_ERR BIT(10) 102e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_TX_WRN BIT(9) 103e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_RX_WRN BIT(8) 104e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_IDLE BIT(7) 105e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_TXRX BIT(6) 106e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_EST_FLT_CONF_SHIFT (4) 107e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_FLT_CONF_MASK (0x3 << FLEXCAN_EST_FLT_CONF_SHIFT) 108e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_FLT_CONF_ACTIVE (0x0 << FLEXCAN_EST_FLT_CONF_SHIFT) 109e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_FLT_CONF_PASSIVE (0x1 << FLEXCAN_EST_FLT_CONF_SHIFT) 110e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_BOFF_INT BIT(2) 111e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_ERR_INT BIT(1) 112e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_WAK_INT BIT(0) 113e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_ERR_BUS \ 114e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde (FLEXCAN_ESR_BIT1_ERR | FLEXCAN_ESR_BIT0_ERR | \ 115e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_ESR_ACK_ERR | FLEXCAN_ESR_CRC_ERR | \ 116e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_ESR_FRM_ERR | FLEXCAN_ESR_STF_ERR) 117e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_ERR_STATE \ 118e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde (FLEXCAN_ESR_TWRN_INT | FLEXCAN_ESR_RWRN_INT | FLEXCAN_ESR_BOFF_INT) 119e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_ERR_ALL \ 120e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde (FLEXCAN_ESR_ERR_BUS | FLEXCAN_ESR_ERR_STATE) 1216e9d554fa6e481a848358c215f129432262123c0Wolfgang Grandegger#define FLEXCAN_ESR_ALL_INT \ 1226e9d554fa6e481a848358c215f129432262123c0Wolfgang Grandegger (FLEXCAN_ESR_TWRN_INT | FLEXCAN_ESR_RWRN_INT | \ 1236e9d554fa6e481a848358c215f129432262123c0Wolfgang Grandegger FLEXCAN_ESR_BOFF_INT | FLEXCAN_ESR_ERR_INT) 124e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 125e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* FLEXCAN interrupt flag register (IFLAG) bits */ 126e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_TX_BUF_ID 8 127e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_IFLAG_BUF(x) BIT(x) 128e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_IFLAG_RX_FIFO_OVERFLOW BIT(7) 129e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_IFLAG_RX_FIFO_WARN BIT(6) 130e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_IFLAG_RX_FIFO_AVAILABLE BIT(5) 131e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_IFLAG_DEFAULT \ 132e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde (FLEXCAN_IFLAG_RX_FIFO_OVERFLOW | FLEXCAN_IFLAG_RX_FIFO_AVAILABLE | \ 133e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_IFLAG_BUF(FLEXCAN_TX_BUF_ID)) 134e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 135e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* FLEXCAN message buffers */ 136e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MB_CNT_CODE(x) (((x) & 0xf) << 24) 137e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MB_CNT_SRR BIT(22) 138e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MB_CNT_IDE BIT(21) 139e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MB_CNT_RTR BIT(20) 140e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MB_CNT_LENGTH(x) (((x) & 0xf) << 16) 141e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MB_CNT_TIMESTAMP(x) ((x) & 0xffff) 142e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 143e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MB_CODE_MASK (0xf0ffffff) 144e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 145e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* Structure of the message buffer */ 146e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestruct flexcan_mb { 147e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 can_ctrl; 148e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 can_id; 149e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 data[2]; 150e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde}; 151e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 152e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* Structure of the hardware registers */ 153e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestruct flexcan_regs { 154e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 mcr; /* 0x00 */ 155e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 ctrl; /* 0x04 */ 156e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 timer; /* 0x08 */ 157e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 _reserved1; /* 0x0c */ 158e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 rxgmask; /* 0x10 */ 159e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 rx14mask; /* 0x14 */ 160e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 rx15mask; /* 0x18 */ 161e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 ecr; /* 0x1c */ 162e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 esr; /* 0x20 */ 163e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 imask2; /* 0x24 */ 164e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 imask1; /* 0x28 */ 165e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 iflag2; /* 0x2c */ 166e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 iflag1; /* 0x30 */ 167e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 _reserved2[19]; 168e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_mb cantxfg[64]; 169e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde}; 170e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 171e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestruct flexcan_priv { 172e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct can_priv can; 173e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct net_device *dev; 174e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct napi_struct napi; 175e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 176e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde void __iomem *base; 177e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg_esr; 178e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg_ctrl_default; 179e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 180e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct clk *clk; 181e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_platform_data *pdata; 182e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde}; 183e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 184e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic struct can_bittiming_const flexcan_bittiming_const = { 185e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .name = DRV_NAME, 186e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .tseg1_min = 4, 187e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .tseg1_max = 16, 188e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .tseg2_min = 2, 189e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .tseg2_max = 8, 190e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .sjw_max = 4, 191e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .brp_min = 1, 192e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .brp_max = 256, 193e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .brp_inc = 1, 194e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde}; 195e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 196e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* 19761e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com * Abstract off the read/write for arm versus ppc. 19861e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com */ 19961e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com#if defined(__BIG_ENDIAN) 20061e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.comstatic inline u32 flexcan_read(void __iomem *addr) 20161e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com{ 20261e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com return in_be32(addr); 20361e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com} 20461e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com 20561e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.comstatic inline void flexcan_write(u32 val, void __iomem *addr) 20661e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com{ 20761e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com out_be32(addr, val); 20861e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com} 20961e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com#else 21061e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.comstatic inline u32 flexcan_read(void __iomem *addr) 21161e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com{ 21261e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com return readl(addr); 21361e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com} 21461e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com 21561e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.comstatic inline void flexcan_write(u32 val, void __iomem *addr) 21661e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com{ 21761e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com writel(val, addr); 21861e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com} 21961e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com#endif 22061e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com 22161e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com/* 222e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * Swtich transceiver on or off 223e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 224e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic void flexcan_transceiver_switch(const struct flexcan_priv *priv, int on) 225e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 226e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (priv->pdata && priv->pdata->transceiver_switch) 227e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->pdata->transceiver_switch(on); 228e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 229e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 230e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic inline int flexcan_has_and_handle_berr(const struct flexcan_priv *priv, 231e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg_esr) 232e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 233e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING) && 234e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde (reg_esr & FLEXCAN_ESR_ERR_BUS); 235e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 236e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 237e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic inline void flexcan_chip_enable(struct flexcan_priv *priv) 238e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 239e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 240e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg; 241e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 24261e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg = flexcan_read(®s->mcr); 243e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg &= ~FLEXCAN_MCR_MDIS; 24461e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(reg, ®s->mcr); 245e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 246e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde udelay(10); 247e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 248e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 249e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic inline void flexcan_chip_disable(struct flexcan_priv *priv) 250e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 251e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 252e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg; 253e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 25461e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg = flexcan_read(®s->mcr); 255e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg |= FLEXCAN_MCR_MDIS; 25661e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(reg, ®s->mcr); 257e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 258e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 259e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int flexcan_get_berr_counter(const struct net_device *dev, 260e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct can_berr_counter *bec) 261e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 262e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde const struct flexcan_priv *priv = netdev_priv(dev); 263e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 26461e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com u32 reg = flexcan_read(®s->ecr); 265e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 266e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde bec->txerr = (reg >> 0) & 0xff; 267e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde bec->rxerr = (reg >> 8) & 0xff; 268e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 269e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 270e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 271e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 272e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int flexcan_start_xmit(struct sk_buff *skb, struct net_device *dev) 273e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 274e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde const struct flexcan_priv *priv = netdev_priv(dev); 275e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 276e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct can_frame *cf = (struct can_frame *)skb->data; 277e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 can_id; 278e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 ctrl = FLEXCAN_MB_CNT_CODE(0xc) | (cf->can_dlc << 16); 279e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 280e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (can_dropped_invalid_skb(dev, skb)) 281e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return NETDEV_TX_OK; 282e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 283e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde netif_stop_queue(dev); 284e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 285e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (cf->can_id & CAN_EFF_FLAG) { 286e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde can_id = cf->can_id & CAN_EFF_MASK; 287e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde ctrl |= FLEXCAN_MB_CNT_IDE | FLEXCAN_MB_CNT_SRR; 288e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } else { 289e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde can_id = (cf->can_id & CAN_SFF_MASK) << 18; 290e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 291e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 292e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (cf->can_id & CAN_RTR_FLAG) 293e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde ctrl |= FLEXCAN_MB_CNT_RTR; 294e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 295e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (cf->can_dlc > 0) { 296e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 data = be32_to_cpup((__be32 *)&cf->data[0]); 29761e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(data, ®s->cantxfg[FLEXCAN_TX_BUF_ID].data[0]); 298e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 299e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (cf->can_dlc > 3) { 300e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 data = be32_to_cpup((__be32 *)&cf->data[4]); 30161e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(data, ®s->cantxfg[FLEXCAN_TX_BUF_ID].data[1]); 302e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 303e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 3049a12349663061d25b49e6542d005fa7193a2cb44Reuben Dowle can_put_echo_skb(skb, dev, 0); 3059a12349663061d25b49e6542d005fa7193a2cb44Reuben Dowle 30661e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(can_id, ®s->cantxfg[FLEXCAN_TX_BUF_ID].can_id); 30761e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(ctrl, ®s->cantxfg[FLEXCAN_TX_BUF_ID].can_ctrl); 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) { 321aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "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) { 326aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "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) { 331aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "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) { 337aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "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) { 343aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "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) { 348aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "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) { 395aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "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) { 411aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "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: 421aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_err(dev, "BUG! " 422aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger "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: 431aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "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); 5796e9d554fa6e481a848358c215f129432262123c0Wolfgang Grandegger /* ACK all bus error and state change IRQ sources */ 5806e9d554fa6e481a848358c215f129432262123c0Wolfgang Grandegger if (reg_esr & FLEXCAN_ESR_ALL_INT) 5816e9d554fa6e481a848358c215f129432262123c0Wolfgang Grandegger flexcan_write(reg_esr & FLEXCAN_ESR_ALL_INT, ®s->esr); 582e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 583e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* 584e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * schedule NAPI in case of: 585e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * - rx IRQ 586e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * - state change IRQ 587e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * - bus error IRQ and bus error reporting is activated 588e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 589e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if ((reg_iflag1 & FLEXCAN_IFLAG_RX_FIFO_AVAILABLE) || 590e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde (reg_esr & FLEXCAN_ESR_ERR_STATE) || 591e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flexcan_has_and_handle_berr(priv, reg_esr)) { 592e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* 593e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * The error bits are cleared on read, 594e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * save them for later use. 595e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 596e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->reg_esr = reg_esr & FLEXCAN_ESR_ERR_BUS; 59761e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(FLEXCAN_IFLAG_DEFAULT & 59861e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com ~FLEXCAN_IFLAG_RX_FIFO_AVAILABLE, ®s->imask1); 59961e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(priv->reg_ctrl_default & ~FLEXCAN_CTRL_ERR_ALL, 600e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde ®s->ctrl); 601e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde napi_schedule(&priv->napi); 602e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 603e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 604e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* FIFO overflow */ 605e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (reg_iflag1 & FLEXCAN_IFLAG_RX_FIFO_OVERFLOW) { 60661e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(FLEXCAN_IFLAG_RX_FIFO_OVERFLOW, ®s->iflag1); 607e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev->stats.rx_over_errors++; 608e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev->stats.rx_errors++; 609e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 610e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 611e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* transmission complete interrupt */ 612e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (reg_iflag1 & (1 << FLEXCAN_TX_BUF_ID)) { 6139a12349663061d25b49e6542d005fa7193a2cb44Reuben Dowle stats->tx_bytes += can_get_echo_skb(dev, 0); 614e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde stats->tx_packets++; 61561e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write((1 << FLEXCAN_TX_BUF_ID), ®s->iflag1); 616e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde netif_wake_queue(dev); 617e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 618e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 619e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return IRQ_HANDLED; 620e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 621e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 622e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic void flexcan_set_bittiming(struct net_device *dev) 623e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 624e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde const struct flexcan_priv *priv = netdev_priv(dev); 625e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde const struct can_bittiming *bt = &priv->can.bittiming; 626e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 627e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg; 628e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 62961e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg = flexcan_read(®s->ctrl); 630e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg &= ~(FLEXCAN_CTRL_PRESDIV(0xff) | 631e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_RJW(0x3) | 632e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_PSEG1(0x7) | 633e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_PSEG2(0x7) | 634e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_PROPSEG(0x7) | 635e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_LPB | 636e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_SMP | 637e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_LOM); 638e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 639e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg |= FLEXCAN_CTRL_PRESDIV(bt->brp - 1) | 640e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_PSEG1(bt->phase_seg1 - 1) | 641e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_PSEG2(bt->phase_seg2 - 1) | 642e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_RJW(bt->sjw - 1) | 643e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_PROPSEG(bt->prop_seg - 1); 644e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 645e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK) 646e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg |= FLEXCAN_CTRL_LPB; 647e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY) 648e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg |= FLEXCAN_CTRL_LOM; 649e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) 650e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg |= FLEXCAN_CTRL_SMP; 651e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 652aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_info(dev, "writing ctrl=0x%08x\n", reg); 65361e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(reg, ®s->ctrl); 654e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 655e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* print chip status */ 656aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "%s: mcr=0x%08x ctrl=0x%08x\n", __func__, 657aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger flexcan_read(®s->mcr), flexcan_read(®s->ctrl)); 658e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 659e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 660e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* 661e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * flexcan_chip_start 662e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 663e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * this functions is entered with clocks enabled 664e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 665e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 666e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int flexcan_chip_start(struct net_device *dev) 667e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 668e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv = netdev_priv(dev); 669e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 670e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde unsigned int i; 671e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde int err; 672e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg_mcr, reg_ctrl; 673e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 674e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* enable module */ 675e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flexcan_chip_enable(priv); 676e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 677e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* soft reset */ 67861e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(FLEXCAN_MCR_SOFTRST, ®s->mcr); 679e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde udelay(10); 680e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 68161e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg_mcr = flexcan_read(®s->mcr); 682e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (reg_mcr & FLEXCAN_MCR_SOFTRST) { 683aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_err(dev, "Failed to softreset can module (mcr=0x%08x)\n", 684aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger reg_mcr); 685e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = -ENODEV; 686e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde goto out; 687e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 688e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 689e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flexcan_set_bittiming(dev); 690e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 691e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* 692e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * MCR 693e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 694e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * enable freeze 695e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * enable fifo 696e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * halt now 697e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * only supervisor access 698e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * enable warning int 699e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * choose format C 7009a12349663061d25b49e6542d005fa7193a2cb44Reuben Dowle * disable local echo 701e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 702e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 70361e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg_mcr = flexcan_read(®s->mcr); 704e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg_mcr |= FLEXCAN_MCR_FRZ | FLEXCAN_MCR_FEN | FLEXCAN_MCR_HALT | 705e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_MCR_SUPV | FLEXCAN_MCR_WRN_EN | 7069a12349663061d25b49e6542d005fa7193a2cb44Reuben Dowle FLEXCAN_MCR_IDAM_C | FLEXCAN_MCR_SRX_DIS; 707aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "%s: writing mcr=0x%08x", __func__, reg_mcr); 70861e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(reg_mcr, ®s->mcr); 709e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 710e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* 711e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * CTRL 712e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 713e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * disable timer sync feature 714e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 715e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * disable auto busoff recovery 716e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * transmit lowest buffer first 717e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 718e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * enable tx and rx warning interrupt 719e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * enable bus off interrupt 720e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * (== FLEXCAN_CTRL_ERR_STATE) 721e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 722e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * _note_: we enable the "error interrupt" 723e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * (FLEXCAN_CTRL_ERR_MSK), too. Otherwise we don't get any 724e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * warning or bus passive interrupts. 725e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 72661e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg_ctrl = flexcan_read(®s->ctrl); 727e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg_ctrl &= ~FLEXCAN_CTRL_TSYN; 728e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg_ctrl |= FLEXCAN_CTRL_BOFF_REC | FLEXCAN_CTRL_LBUF | 729e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_ERR_STATE | FLEXCAN_CTRL_ERR_MSK; 730e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 731e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* save for later use */ 732e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->reg_ctrl_default = reg_ctrl; 733aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "%s: writing ctrl=0x%08x", __func__, reg_ctrl); 73461e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(reg_ctrl, ®s->ctrl); 735e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 736e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde for (i = 0; i < ARRAY_SIZE(regs->cantxfg); i++) { 73761e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(0, ®s->cantxfg[i].can_ctrl); 73861e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(0, ®s->cantxfg[i].can_id); 73961e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(0, ®s->cantxfg[i].data[0]); 74061e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(0, ®s->cantxfg[i].data[1]); 741e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 742e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* put MB into rx queue */ 74361e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(FLEXCAN_MB_CNT_CODE(0x4), 74461e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com ®s->cantxfg[i].can_ctrl); 745e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 746e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 747e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* acceptance mask/acceptance code (accept everything) */ 74861e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(0x0, ®s->rxgmask); 74961e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(0x0, ®s->rx14mask); 75061e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(0x0, ®s->rx15mask); 751e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 752e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flexcan_transceiver_switch(priv, 1); 753e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 754e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* synchronize with the can bus */ 75561e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg_mcr = flexcan_read(®s->mcr); 756e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg_mcr &= ~FLEXCAN_MCR_HALT; 75761e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(reg_mcr, ®s->mcr); 758e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 759e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->can.state = CAN_STATE_ERROR_ACTIVE; 760e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 761e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* enable FIFO interrupts */ 76261e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(FLEXCAN_IFLAG_DEFAULT, ®s->imask1); 763e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 764e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* print chip status */ 765aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "%s: reading mcr=0x%08x ctrl=0x%08x\n", __func__, 766aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger flexcan_read(®s->mcr), flexcan_read(®s->ctrl)); 767e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 768e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 769e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 770e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde out: 771e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flexcan_chip_disable(priv); 772e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return err; 773e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 774e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 775e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* 776e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * flexcan_chip_stop 777e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 778e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * this functions is entered with clocks enabled 779e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 780e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 781e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic void flexcan_chip_stop(struct net_device *dev) 782e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 783e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv = netdev_priv(dev); 784e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 785e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg; 786e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 787e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* Disable all interrupts */ 78861e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(0, ®s->imask1); 789e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 790e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* Disable + halt module */ 79161e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg = flexcan_read(®s->mcr); 792e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg |= FLEXCAN_MCR_MDIS | FLEXCAN_MCR_HALT; 79361e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(reg, ®s->mcr); 794e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 795e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flexcan_transceiver_switch(priv, 0); 796e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->can.state = CAN_STATE_STOPPED; 797e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 798e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return; 799e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 800e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 801e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int flexcan_open(struct net_device *dev) 802e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 803e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv = netdev_priv(dev); 804e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde int err; 805e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 806e735489976c356a189f7332e6ff4b0dee2ede434Shawn Guo clk_prepare_enable(priv->clk); 807e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 808e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = open_candev(dev); 809e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (err) 810e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde goto out; 811e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 812e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = request_irq(dev->irq, flexcan_irq, IRQF_SHARED, dev->name, dev); 813e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (err) 814e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde goto out_close; 815e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 816e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* start chip and queuing */ 817e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = flexcan_chip_start(dev); 818e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (err) 819e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde goto out_close; 820e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde napi_enable(&priv->napi); 821e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde netif_start_queue(dev); 822e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 823e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 824e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 825e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde out_close: 826e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde close_candev(dev); 827e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde out: 828e735489976c356a189f7332e6ff4b0dee2ede434Shawn Guo clk_disable_unprepare(priv->clk); 829e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 830e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return err; 831e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 832e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 833e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int flexcan_close(struct net_device *dev) 834e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 835e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv = netdev_priv(dev); 836e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 837e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde netif_stop_queue(dev); 838e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde napi_disable(&priv->napi); 839e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flexcan_chip_stop(dev); 840e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 841e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde free_irq(dev->irq, dev); 842e735489976c356a189f7332e6ff4b0dee2ede434Shawn Guo clk_disable_unprepare(priv->clk); 843e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 844e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde close_candev(dev); 845e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 846e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 847e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 848e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 849e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int flexcan_set_mode(struct net_device *dev, enum can_mode mode) 850e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 851e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde int err; 852e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 853e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde switch (mode) { 854e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde case CAN_MODE_START: 855e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = flexcan_chip_start(dev); 856e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (err) 857e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return err; 858e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 859e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde netif_wake_queue(dev); 860e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde break; 861e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 862e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde default: 863e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return -EOPNOTSUPP; 864e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 865e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 866e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 867e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 868e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 869e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic const struct net_device_ops flexcan_netdev_ops = { 870e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .ndo_open = flexcan_open, 871e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .ndo_stop = flexcan_close, 872e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .ndo_start_xmit = flexcan_start_xmit, 873e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde}; 874e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 875e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int __devinit register_flexcandev(struct net_device *dev) 876e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 877e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv = netdev_priv(dev); 878e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 879e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg, err; 880e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 881e735489976c356a189f7332e6ff4b0dee2ede434Shawn Guo clk_prepare_enable(priv->clk); 882e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 883e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* select "bus clock", chip must be disabled */ 884e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flexcan_chip_disable(priv); 88561e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg = flexcan_read(®s->ctrl); 886e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg |= FLEXCAN_CTRL_CLK_SRC; 88761e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(reg, ®s->ctrl); 888e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 889e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flexcan_chip_enable(priv); 890e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 891e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* set freeze, halt and activate FIFO, restrict register access */ 89261e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg = flexcan_read(®s->mcr); 893e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg |= FLEXCAN_MCR_FRZ | FLEXCAN_MCR_HALT | 894e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_MCR_FEN | FLEXCAN_MCR_SUPV; 89561e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(reg, ®s->mcr); 896e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 897e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* 898e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * Currently we only support newer versions of this core 899e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * featuring a RX FIFO. Older cores found on some Coldfire 900e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * derivates are not yet supported. 901e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 90261e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg = flexcan_read(®s->mcr); 903e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (!(reg & FLEXCAN_MCR_FEN)) { 904aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_err(dev, "Could not enable RX FIFO, unsupported core\n"); 905e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = -ENODEV; 906e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde goto out; 907e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 908e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 909e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = register_candev(dev); 910e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 911e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde out: 912e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* disable core and turn off clocks */ 913e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flexcan_chip_disable(priv); 914e735489976c356a189f7332e6ff4b0dee2ede434Shawn Guo clk_disable_unprepare(priv->clk); 915e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 916e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return err; 917e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 918e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 919e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic void __devexit unregister_flexcandev(struct net_device *dev) 920e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 921e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde unregister_candev(dev); 922e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 923e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 924e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int __devinit flexcan_probe(struct platform_device *pdev) 925e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 926e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct net_device *dev; 927e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv; 928e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct resource *mem; 92997efe9aef1ae8922666d32f28d712745a86859e9holt@sgi.com struct clk *clk = NULL; 930e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde void __iomem *base; 931e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde resource_size_t mem_size; 932e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde int err, irq; 93397efe9aef1ae8922666d32f28d712745a86859e9holt@sgi.com u32 clock_freq = 0; 93497efe9aef1ae8922666d32f28d712745a86859e9holt@sgi.com 93597efe9aef1ae8922666d32f28d712745a86859e9holt@sgi.com if (pdev->dev.of_node) { 93697efe9aef1ae8922666d32f28d712745a86859e9holt@sgi.com const u32 *clock_freq_p; 937e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 93897efe9aef1ae8922666d32f28d712745a86859e9holt@sgi.com clock_freq_p = of_get_property(pdev->dev.of_node, 93997efe9aef1ae8922666d32f28d712745a86859e9holt@sgi.com "clock-frequency", NULL); 94097efe9aef1ae8922666d32f28d712745a86859e9holt@sgi.com if (clock_freq_p) 94197efe9aef1ae8922666d32f28d712745a86859e9holt@sgi.com clock_freq = *clock_freq_p; 94297efe9aef1ae8922666d32f28d712745a86859e9holt@sgi.com } 94397efe9aef1ae8922666d32f28d712745a86859e9holt@sgi.com 94497efe9aef1ae8922666d32f28d712745a86859e9holt@sgi.com if (!clock_freq) { 94597efe9aef1ae8922666d32f28d712745a86859e9holt@sgi.com clk = clk_get(&pdev->dev, NULL); 94697efe9aef1ae8922666d32f28d712745a86859e9holt@sgi.com if (IS_ERR(clk)) { 94797efe9aef1ae8922666d32f28d712745a86859e9holt@sgi.com dev_err(&pdev->dev, "no clock defined\n"); 94897efe9aef1ae8922666d32f28d712745a86859e9holt@sgi.com err = PTR_ERR(clk); 94997efe9aef1ae8922666d32f28d712745a86859e9holt@sgi.com goto failed_clock; 95097efe9aef1ae8922666d32f28d712745a86859e9holt@sgi.com } 95197efe9aef1ae8922666d32f28d712745a86859e9holt@sgi.com clock_freq = clk_get_rate(clk); 952e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 953e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 954e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 955e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde irq = platform_get_irq(pdev, 0); 956e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (!mem || irq <= 0) { 957e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = -ENODEV; 958e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde goto failed_get; 959e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 960e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 961e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde mem_size = resource_size(mem); 962e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (!request_mem_region(mem->start, mem_size, pdev->name)) { 963e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = -EBUSY; 9642e4ceec4edaef6e903422792de4f7f37de98cec6Julia Lawall goto failed_get; 965e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 966e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 967e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde base = ioremap(mem->start, mem_size); 968e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (!base) { 969e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = -ENOMEM; 970e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde goto failed_map; 971e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 972e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 9739a12349663061d25b49e6542d005fa7193a2cb44Reuben Dowle dev = alloc_candev(sizeof(struct flexcan_priv), 1); 974e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (!dev) { 975e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = -ENOMEM; 976e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde goto failed_alloc; 977e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 978e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 979e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev->netdev_ops = &flexcan_netdev_ops; 980e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev->irq = irq; 9819a12349663061d25b49e6542d005fa7193a2cb44Reuben Dowle dev->flags |= IFF_ECHO; 982e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 983e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv = netdev_priv(dev); 98497efe9aef1ae8922666d32f28d712745a86859e9holt@sgi.com priv->can.clock.freq = clock_freq; 985e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->can.bittiming_const = &flexcan_bittiming_const; 986e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->can.do_set_mode = flexcan_set_mode; 987e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->can.do_get_berr_counter = flexcan_get_berr_counter; 988e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK | 989e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde CAN_CTRLMODE_LISTENONLY | CAN_CTRLMODE_3_SAMPLES | 990e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde CAN_CTRLMODE_BERR_REPORTING; 991e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->base = base; 992e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->dev = dev; 993e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->clk = clk; 994e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->pdata = pdev->dev.platform_data; 995e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 996e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde netif_napi_add(dev, &priv->napi, flexcan_poll, FLEXCAN_NAPI_WEIGHT); 997e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 998e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev_set_drvdata(&pdev->dev, dev); 999e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde SET_NETDEV_DEV(dev, &pdev->dev); 1000e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1001e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = register_flexcandev(dev); 1002e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (err) { 1003e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev_err(&pdev->dev, "registering netdev failed\n"); 1004e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde goto failed_register; 1005e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 1006e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1007e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev_info(&pdev->dev, "device registered (reg_base=%p, irq=%d)\n", 1008e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->base, dev->irq); 1009e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1010e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 1011e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1012e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde failed_register: 1013e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde free_candev(dev); 1014e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde failed_alloc: 1015e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde iounmap(base); 1016e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde failed_map: 1017e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde release_mem_region(mem->start, mem_size); 1018e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde failed_get: 101997efe9aef1ae8922666d32f28d712745a86859e9holt@sgi.com if (clk) 102097efe9aef1ae8922666d32f28d712745a86859e9holt@sgi.com clk_put(clk); 1021e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde failed_clock: 1022e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return err; 1023e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 1024e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1025e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int __devexit flexcan_remove(struct platform_device *pdev) 1026e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 1027e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct net_device *dev = platform_get_drvdata(pdev); 1028e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv = netdev_priv(dev); 1029e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct resource *mem; 1030e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1031e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde unregister_flexcandev(dev); 1032e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde platform_set_drvdata(pdev, NULL); 1033e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde iounmap(priv->base); 1034e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1035e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1036e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde release_mem_region(mem->start, resource_size(mem)); 1037e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 103897efe9aef1ae8922666d32f28d712745a86859e9holt@sgi.com if (priv->clk) 103997efe9aef1ae8922666d32f28d712745a86859e9holt@sgi.com clk_put(priv->clk); 1040e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 10419a27586d3d5c3157260b055d057c6f4f6654c72cMarc Kleine-Budde free_candev(dev); 10429a27586d3d5c3157260b055d057c6f4f6654c72cMarc Kleine-Budde 1043e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 1044e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 1045e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1046c8aef4cb788b760331e6df06a5d93389824882b4holt@sgi.comstatic struct of_device_id flexcan_of_match[] = { 1047c8aef4cb788b760331e6df06a5d93389824882b4holt@sgi.com { 1048c8aef4cb788b760331e6df06a5d93389824882b4holt@sgi.com .compatible = "fsl,p1010-flexcan", 1049c8aef4cb788b760331e6df06a5d93389824882b4holt@sgi.com }, 1050c8aef4cb788b760331e6df06a5d93389824882b4holt@sgi.com {}, 1051c8aef4cb788b760331e6df06a5d93389824882b4holt@sgi.com}; 1052c8aef4cb788b760331e6df06a5d93389824882b4holt@sgi.com 10538b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard#ifdef CONFIG_PM 10548b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénardstatic int flexcan_suspend(struct platform_device *pdev, pm_message_t state) 10558b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard{ 10568b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard struct net_device *dev = platform_get_drvdata(pdev); 10578b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard struct flexcan_priv *priv = netdev_priv(dev); 10588b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard 10598b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard flexcan_chip_disable(priv); 10608b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard 10618b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard if (netif_running(dev)) { 10628b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard netif_stop_queue(dev); 10638b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard netif_device_detach(dev); 10648b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard } 10658b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard priv->can.state = CAN_STATE_SLEEPING; 10668b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard 10678b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard return 0; 10688b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard} 10698b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard 10708b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénardstatic int flexcan_resume(struct platform_device *pdev) 10718b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard{ 10728b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard struct net_device *dev = platform_get_drvdata(pdev); 10738b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard struct flexcan_priv *priv = netdev_priv(dev); 10748b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard 10758b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard priv->can.state = CAN_STATE_ERROR_ACTIVE; 10768b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard if (netif_running(dev)) { 10778b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard netif_device_attach(dev); 10788b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard netif_start_queue(dev); 10798b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard } 10808b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard flexcan_chip_enable(priv); 10818b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard 10828b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard return 0; 10838b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard} 10848b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard#else 10858b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard#define flexcan_suspend NULL 10868b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard#define flexcan_resume NULL 10878b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard#endif 10888b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard 1089e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic struct platform_driver flexcan_driver = { 1090c8aef4cb788b760331e6df06a5d93389824882b4holt@sgi.com .driver = { 1091c8aef4cb788b760331e6df06a5d93389824882b4holt@sgi.com .name = DRV_NAME, 1092c8aef4cb788b760331e6df06a5d93389824882b4holt@sgi.com .owner = THIS_MODULE, 1093c8aef4cb788b760331e6df06a5d93389824882b4holt@sgi.com .of_match_table = flexcan_of_match, 1094c8aef4cb788b760331e6df06a5d93389824882b4holt@sgi.com }, 1095e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .probe = flexcan_probe, 1096e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .remove = __devexit_p(flexcan_remove), 10978b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard .suspend = flexcan_suspend, 10988b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard .resume = flexcan_resume, 1099e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde}; 1100e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1101871d33725545ca2e402b4526f38f89d041ba930fAxel Linmodule_platform_driver(flexcan_driver); 1102e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1103e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-BuddeMODULE_AUTHOR("Sascha Hauer <kernel@pengutronix.de>, " 1104e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde "Marc Kleine-Budde <kernel@pengutronix.de>"); 1105e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-BuddeMODULE_LICENSE("GPL v2"); 1106e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-BuddeMODULE_DESCRIPTION("CAN port driver for flexcan based chip"); 1107