flexcan.c revision b7c4114b07bbacfe0aee1d04ad1ade9e42309620
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> 26adccadb92f0571fd0f9b2ac8011057a7de9e3e63Fabio Baltieri#include <linux/can/led.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> 3730c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang#include <linux/of_device.h> 38e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#include <linux/platform_device.h> 39b7c4114b07bbacfe0aee1d04ad1ade9e42309620Fabio Estevam#include <linux/regulator/consumer.h> 40e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 41e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define DRV_NAME "flexcan" 42e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 43e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* 8 for RX fifo and 2 error handling */ 44e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_NAPI_WEIGHT (8 + 2) 45e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 46e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* FLEXCAN module configuration register (CANMCR) bits */ 47e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_MDIS BIT(31) 48e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_FRZ BIT(30) 49e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_FEN BIT(29) 50e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_HALT BIT(28) 51e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_NOT_RDY BIT(27) 52e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_WAK_MSK BIT(26) 53e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_SOFTRST BIT(25) 54e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_FRZ_ACK BIT(24) 55e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_SUPV BIT(23) 56e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_SLF_WAK BIT(22) 57e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_WRN_EN BIT(21) 58e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_LPM_ACK BIT(20) 59e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_WAK_SRC BIT(19) 60e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_DOZE BIT(18) 61e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_SRX_DIS BIT(17) 62e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_BCC BIT(16) 63e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_LPRIO_EN BIT(13) 64e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_AEN BIT(12) 65e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_MAXMB(x) ((x) & 0xf) 66e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_IDAM_A (0 << 8) 67e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_IDAM_B (1 << 8) 68e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_IDAM_C (2 << 8) 69e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_IDAM_D (3 << 8) 70e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 71e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* FLEXCAN control register (CANCTRL) bits */ 72e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_PRESDIV(x) (((x) & 0xff) << 24) 73e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_RJW(x) (((x) & 0x03) << 22) 74e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_PSEG1(x) (((x) & 0x07) << 19) 75e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_PSEG2(x) (((x) & 0x07) << 16) 76e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_BOFF_MSK BIT(15) 77e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_ERR_MSK BIT(14) 78e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_CLK_SRC BIT(13) 79e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_LPB BIT(12) 80e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_TWRN_MSK BIT(11) 81e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_RWRN_MSK BIT(10) 82e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_SMP BIT(7) 83e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_BOFF_REC BIT(6) 84e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_TSYN BIT(5) 85e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_LBUF BIT(4) 86e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_LOM BIT(3) 87e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_PROPSEG(x) ((x) & 0x07) 88e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_ERR_BUS (FLEXCAN_CTRL_ERR_MSK) 89e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_ERR_STATE \ 90e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde (FLEXCAN_CTRL_TWRN_MSK | FLEXCAN_CTRL_RWRN_MSK | \ 91e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_BOFF_MSK) 92e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_ERR_ALL \ 93e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde (FLEXCAN_CTRL_ERR_BUS | FLEXCAN_CTRL_ERR_STATE) 94e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 95e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* FLEXCAN error and status register (ESR) bits */ 96e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_TWRN_INT BIT(17) 97e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_RWRN_INT BIT(16) 98e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_BIT1_ERR BIT(15) 99e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_BIT0_ERR BIT(14) 100e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_ACK_ERR BIT(13) 101e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_CRC_ERR BIT(12) 102e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_FRM_ERR BIT(11) 103e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_STF_ERR BIT(10) 104e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_TX_WRN BIT(9) 105e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_RX_WRN BIT(8) 106e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_IDLE BIT(7) 107e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_TXRX BIT(6) 108e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_EST_FLT_CONF_SHIFT (4) 109e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_FLT_CONF_MASK (0x3 << FLEXCAN_EST_FLT_CONF_SHIFT) 110e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_FLT_CONF_ACTIVE (0x0 << FLEXCAN_EST_FLT_CONF_SHIFT) 111e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_FLT_CONF_PASSIVE (0x1 << FLEXCAN_EST_FLT_CONF_SHIFT) 112e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_BOFF_INT BIT(2) 113e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_ERR_INT BIT(1) 114e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_WAK_INT BIT(0) 115e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_ERR_BUS \ 116e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde (FLEXCAN_ESR_BIT1_ERR | FLEXCAN_ESR_BIT0_ERR | \ 117e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_ESR_ACK_ERR | FLEXCAN_ESR_CRC_ERR | \ 118e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_ESR_FRM_ERR | FLEXCAN_ESR_STF_ERR) 119e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_ERR_STATE \ 120e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde (FLEXCAN_ESR_TWRN_INT | FLEXCAN_ESR_RWRN_INT | FLEXCAN_ESR_BOFF_INT) 121e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_ERR_ALL \ 122e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde (FLEXCAN_ESR_ERR_BUS | FLEXCAN_ESR_ERR_STATE) 1236e9d554fa6e481a848358c215f129432262123c0Wolfgang Grandegger#define FLEXCAN_ESR_ALL_INT \ 1246e9d554fa6e481a848358c215f129432262123c0Wolfgang Grandegger (FLEXCAN_ESR_TWRN_INT | FLEXCAN_ESR_RWRN_INT | \ 1256e9d554fa6e481a848358c215f129432262123c0Wolfgang Grandegger FLEXCAN_ESR_BOFF_INT | FLEXCAN_ESR_ERR_INT) 126e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 127e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* FLEXCAN interrupt flag register (IFLAG) bits */ 128e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_TX_BUF_ID 8 129e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_IFLAG_BUF(x) BIT(x) 130e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_IFLAG_RX_FIFO_OVERFLOW BIT(7) 131e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_IFLAG_RX_FIFO_WARN BIT(6) 132e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_IFLAG_RX_FIFO_AVAILABLE BIT(5) 133e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_IFLAG_DEFAULT \ 134e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde (FLEXCAN_IFLAG_RX_FIFO_OVERFLOW | FLEXCAN_IFLAG_RX_FIFO_AVAILABLE | \ 135e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_IFLAG_BUF(FLEXCAN_TX_BUF_ID)) 136e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 137e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* FLEXCAN message buffers */ 138e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MB_CNT_CODE(x) (((x) & 0xf) << 24) 139e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MB_CNT_SRR BIT(22) 140e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MB_CNT_IDE BIT(21) 141e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MB_CNT_RTR BIT(20) 142e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MB_CNT_LENGTH(x) (((x) & 0xf) << 16) 143e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MB_CNT_TIMESTAMP(x) ((x) & 0xffff) 144e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 145e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MB_CODE_MASK (0xf0ffffff) 146e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 147bb698ca41ba574b3066ebbc5766e5980ae0051caWolfgang Grandegger/* 148bb698ca41ba574b3066ebbc5766e5980ae0051caWolfgang Grandegger * FLEXCAN hardware feature flags 149bb698ca41ba574b3066ebbc5766e5980ae0051caWolfgang Grandegger * 150bb698ca41ba574b3066ebbc5766e5980ae0051caWolfgang Grandegger * Below is some version info we got: 151bb698ca41ba574b3066ebbc5766e5980ae0051caWolfgang Grandegger * SOC Version IP-Version Glitch- [TR]WRN_INT 152bb698ca41ba574b3066ebbc5766e5980ae0051caWolfgang Grandegger * Filter? connected? 153bb698ca41ba574b3066ebbc5766e5980ae0051caWolfgang Grandegger * MX25 FlexCAN2 03.00.00.00 no no 154bb698ca41ba574b3066ebbc5766e5980ae0051caWolfgang Grandegger * MX28 FlexCAN2 03.00.04.00 yes yes 155bb698ca41ba574b3066ebbc5766e5980ae0051caWolfgang Grandegger * MX35 FlexCAN2 03.00.00.00 no no 156bb698ca41ba574b3066ebbc5766e5980ae0051caWolfgang Grandegger * MX53 FlexCAN2 03.00.00.00 yes no 157bb698ca41ba574b3066ebbc5766e5980ae0051caWolfgang Grandegger * MX6s FlexCAN3 10.00.12.00 yes yes 158bb698ca41ba574b3066ebbc5766e5980ae0051caWolfgang Grandegger * 159bb698ca41ba574b3066ebbc5766e5980ae0051caWolfgang Grandegger * Some SOCs do not have the RX_WARN & TX_WARN interrupt line connected. 160bb698ca41ba574b3066ebbc5766e5980ae0051caWolfgang Grandegger */ 1614f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandegger#define FLEXCAN_HAS_V10_FEATURES BIT(1) /* For core version >= 10 */ 162bb698ca41ba574b3066ebbc5766e5980ae0051caWolfgang Grandegger#define FLEXCAN_HAS_BROKEN_ERR_STATE BIT(2) /* [TR]WRN_INT not connected */ 1634f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandegger 164e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* Structure of the message buffer */ 165e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestruct flexcan_mb { 166e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 can_ctrl; 167e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 can_id; 168e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 data[2]; 169e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde}; 170e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 171e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* Structure of the hardware registers */ 172e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestruct flexcan_regs { 173e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 mcr; /* 0x00 */ 174e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 ctrl; /* 0x04 */ 175e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 timer; /* 0x08 */ 176e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 _reserved1; /* 0x0c */ 177e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 rxgmask; /* 0x10 */ 178e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 rx14mask; /* 0x14 */ 179e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 rx15mask; /* 0x18 */ 180e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 ecr; /* 0x1c */ 181e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 esr; /* 0x20 */ 182e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 imask2; /* 0x24 */ 183e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 imask1; /* 0x28 */ 184e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 iflag2; /* 0x2c */ 185e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 iflag1; /* 0x30 */ 18630c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang u32 crl2; /* 0x34 */ 18730c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang u32 esr2; /* 0x38 */ 18830c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang u32 imeur; /* 0x3c */ 18930c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang u32 lrfr; /* 0x40 */ 19030c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang u32 crcr; /* 0x44 */ 19130c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang u32 rxfgmask; /* 0x48 */ 19230c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang u32 rxfir; /* 0x4c */ 19330c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang u32 _reserved3[12]; 194e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_mb cantxfg[64]; 195e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde}; 196e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 19730c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wangstruct flexcan_devtype_data { 1984f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandegger u32 features; /* hardware controller features */ 19930c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang}; 20030c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang 201e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestruct flexcan_priv { 202e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct can_priv can; 203e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct net_device *dev; 204e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct napi_struct napi; 205e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 206e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde void __iomem *base; 207e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg_esr; 208e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg_ctrl_default; 209e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 2103d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar struct clk *clk_ipg; 2113d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar struct clk *clk_per; 212e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_platform_data *pdata; 213dda0b3bd1cbb66ee869d589f7d719f703d7c38a1Marc Kleine-Budde const struct flexcan_devtype_data *devtype_data; 214b7c4114b07bbacfe0aee1d04ad1ade9e42309620Fabio Estevam struct regulator *reg_xceiver; 21530c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang}; 21630c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang 21730c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wangstatic struct flexcan_devtype_data fsl_p1010_devtype_data = { 2184f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandegger .features = FLEXCAN_HAS_BROKEN_ERR_STATE, 21930c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang}; 2204f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandeggerstatic struct flexcan_devtype_data fsl_imx28_devtype_data; 22130c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wangstatic struct flexcan_devtype_data fsl_imx6q_devtype_data = { 222bb698ca41ba574b3066ebbc5766e5980ae0051caWolfgang Grandegger .features = FLEXCAN_HAS_V10_FEATURES, 223e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde}; 224e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 225194b9a4cb91713ddb60c9f98f7212f6d8cb8e05fMarc Kleine-Buddestatic const struct can_bittiming_const flexcan_bittiming_const = { 226e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .name = DRV_NAME, 227e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .tseg1_min = 4, 228e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .tseg1_max = 16, 229e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .tseg2_min = 2, 230e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .tseg2_max = 8, 231e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .sjw_max = 4, 232e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .brp_min = 1, 233e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .brp_max = 256, 234e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .brp_inc = 1, 235e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde}; 236e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 237e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* 23861e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com * Abstract off the read/write for arm versus ppc. 23961e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com */ 24061e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com#if defined(__BIG_ENDIAN) 24161e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.comstatic inline u32 flexcan_read(void __iomem *addr) 24261e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com{ 24361e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com return in_be32(addr); 24461e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com} 24561e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com 24661e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.comstatic inline void flexcan_write(u32 val, void __iomem *addr) 24761e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com{ 24861e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com out_be32(addr, val); 24961e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com} 25061e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com#else 25161e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.comstatic inline u32 flexcan_read(void __iomem *addr) 25261e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com{ 25361e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com return readl(addr); 25461e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com} 25561e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com 25661e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.comstatic inline void flexcan_write(u32 val, void __iomem *addr) 25761e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com{ 25861e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com writel(val, addr); 25961e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com} 26061e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com#endif 26161e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com 262e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic inline int flexcan_has_and_handle_berr(const struct flexcan_priv *priv, 263e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg_esr) 264e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 265e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING) && 266e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde (reg_esr & FLEXCAN_ESR_ERR_BUS); 267e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 268e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 269e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic inline void flexcan_chip_enable(struct flexcan_priv *priv) 270e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 271e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 272e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg; 273e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 27461e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg = flexcan_read(®s->mcr); 275e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg &= ~FLEXCAN_MCR_MDIS; 27661e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(reg, ®s->mcr); 277e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 278e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde udelay(10); 279e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 280e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 281e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic inline void flexcan_chip_disable(struct flexcan_priv *priv) 282e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 283e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 284e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg; 285e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 28661e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg = flexcan_read(®s->mcr); 287e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg |= FLEXCAN_MCR_MDIS; 28861e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(reg, ®s->mcr); 289e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 290e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 291e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int flexcan_get_berr_counter(const struct net_device *dev, 292e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct can_berr_counter *bec) 293e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 294e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde const struct flexcan_priv *priv = netdev_priv(dev); 295e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 29661e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com u32 reg = flexcan_read(®s->ecr); 297e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 298e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde bec->txerr = (reg >> 0) & 0xff; 299e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde bec->rxerr = (reg >> 8) & 0xff; 300e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 301e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 302e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 303e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 304e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int flexcan_start_xmit(struct sk_buff *skb, struct net_device *dev) 305e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 306e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde const struct flexcan_priv *priv = netdev_priv(dev); 307e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 308e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct can_frame *cf = (struct can_frame *)skb->data; 309e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 can_id; 310e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 ctrl = FLEXCAN_MB_CNT_CODE(0xc) | (cf->can_dlc << 16); 311e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 312e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (can_dropped_invalid_skb(dev, skb)) 313e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return NETDEV_TX_OK; 314e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 315e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde netif_stop_queue(dev); 316e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 317e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (cf->can_id & CAN_EFF_FLAG) { 318e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde can_id = cf->can_id & CAN_EFF_MASK; 319e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde ctrl |= FLEXCAN_MB_CNT_IDE | FLEXCAN_MB_CNT_SRR; 320e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } else { 321e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde can_id = (cf->can_id & CAN_SFF_MASK) << 18; 322e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 323e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 324e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (cf->can_id & CAN_RTR_FLAG) 325e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde ctrl |= FLEXCAN_MB_CNT_RTR; 326e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 327e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (cf->can_dlc > 0) { 328e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 data = be32_to_cpup((__be32 *)&cf->data[0]); 32961e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(data, ®s->cantxfg[FLEXCAN_TX_BUF_ID].data[0]); 330e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 331e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (cf->can_dlc > 3) { 332e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 data = be32_to_cpup((__be32 *)&cf->data[4]); 33361e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(data, ®s->cantxfg[FLEXCAN_TX_BUF_ID].data[1]); 334e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 335e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 3369a12349663061d25b49e6542d005fa7193a2cb44Reuben Dowle can_put_echo_skb(skb, dev, 0); 3379a12349663061d25b49e6542d005fa7193a2cb44Reuben Dowle 33861e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(can_id, ®s->cantxfg[FLEXCAN_TX_BUF_ID].can_id); 33961e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(ctrl, ®s->cantxfg[FLEXCAN_TX_BUF_ID].can_ctrl); 340e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 341e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return NETDEV_TX_OK; 342e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 343e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 344e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic void do_bus_err(struct net_device *dev, 345e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct can_frame *cf, u32 reg_esr) 346e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 347e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv = netdev_priv(dev); 348e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde int rx_errors = 0, tx_errors = 0; 349e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 350e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR; 351e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 352e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (reg_esr & FLEXCAN_ESR_BIT1_ERR) { 353aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "BIT1_ERR irq\n"); 354e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->data[2] |= CAN_ERR_PROT_BIT1; 355e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde tx_errors = 1; 356e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 357e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (reg_esr & FLEXCAN_ESR_BIT0_ERR) { 358aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "BIT0_ERR irq\n"); 359e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->data[2] |= CAN_ERR_PROT_BIT0; 360e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde tx_errors = 1; 361e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 362e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (reg_esr & FLEXCAN_ESR_ACK_ERR) { 363aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "ACK_ERR irq\n"); 364e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->can_id |= CAN_ERR_ACK; 365e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->data[3] |= CAN_ERR_PROT_LOC_ACK; 366e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde tx_errors = 1; 367e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 368e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (reg_esr & FLEXCAN_ESR_CRC_ERR) { 369aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "CRC_ERR irq\n"); 370e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->data[2] |= CAN_ERR_PROT_BIT; 371e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->data[3] |= CAN_ERR_PROT_LOC_CRC_SEQ; 372e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde rx_errors = 1; 373e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 374e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (reg_esr & FLEXCAN_ESR_FRM_ERR) { 375aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "FRM_ERR irq\n"); 376e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->data[2] |= CAN_ERR_PROT_FORM; 377e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde rx_errors = 1; 378e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 379e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (reg_esr & FLEXCAN_ESR_STF_ERR) { 380aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "STF_ERR irq\n"); 381e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->data[2] |= CAN_ERR_PROT_STUFF; 382e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde rx_errors = 1; 383e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 384e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 385e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->can.can_stats.bus_error++; 386e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (rx_errors) 387e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev->stats.rx_errors++; 388e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (tx_errors) 389e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev->stats.tx_errors++; 390e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 391e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 392e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int flexcan_poll_bus_err(struct net_device *dev, u32 reg_esr) 393e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 394e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct sk_buff *skb; 395e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct can_frame *cf; 396e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 397e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde skb = alloc_can_err_skb(dev, &cf); 398e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (unlikely(!skb)) 399e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 400e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 401e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde do_bus_err(dev, cf, reg_esr); 402e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde netif_receive_skb(skb); 403e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 404e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev->stats.rx_packets++; 405e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev->stats.rx_bytes += cf->can_dlc; 406e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 407e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 1; 408e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 409e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 410e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic void do_state(struct net_device *dev, 411e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct can_frame *cf, enum can_state new_state) 412e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 413e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv = netdev_priv(dev); 414e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct can_berr_counter bec; 415e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 416e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flexcan_get_berr_counter(dev, &bec); 417e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 418e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde switch (priv->can.state) { 419e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde case CAN_STATE_ERROR_ACTIVE: 420e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* 421e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * from: ERROR_ACTIVE 422e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * to : ERROR_WARNING, ERROR_PASSIVE, BUS_OFF 423e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * => : there was a warning int 424e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 425e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (new_state >= CAN_STATE_ERROR_WARNING && 426e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde new_state <= CAN_STATE_BUS_OFF) { 427aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "Error Warning IRQ\n"); 428e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->can.can_stats.error_warning++; 429e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 430e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->can_id |= CAN_ERR_CRTL; 431e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->data[1] = (bec.txerr > bec.rxerr) ? 432e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde CAN_ERR_CRTL_TX_WARNING : 433e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde CAN_ERR_CRTL_RX_WARNING; 434e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 435e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde case CAN_STATE_ERROR_WARNING: /* fallthrough */ 436e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* 437e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * from: ERROR_ACTIVE, ERROR_WARNING 438e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * to : ERROR_PASSIVE, BUS_OFF 439e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * => : error passive int 440e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 441e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (new_state >= CAN_STATE_ERROR_PASSIVE && 442e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde new_state <= CAN_STATE_BUS_OFF) { 443aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "Error Passive IRQ\n"); 444e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->can.can_stats.error_passive++; 445e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 446e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->can_id |= CAN_ERR_CRTL; 447e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->data[1] = (bec.txerr > bec.rxerr) ? 448e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde CAN_ERR_CRTL_TX_PASSIVE : 449e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde CAN_ERR_CRTL_RX_PASSIVE; 450e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 451e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde break; 452e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde case CAN_STATE_BUS_OFF: 453aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_err(dev, "BUG! " 454aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger "hardware recovered automatically from BUS_OFF\n"); 455e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde break; 456e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde default: 457e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde break; 458e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 459e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 460e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* process state changes depending on the new state */ 461e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde switch (new_state) { 462e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde case CAN_STATE_ERROR_ACTIVE: 463aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "Error Active\n"); 464e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->can_id |= CAN_ERR_PROT; 465e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->data[2] = CAN_ERR_PROT_ACTIVE; 466e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde break; 467e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde case CAN_STATE_BUS_OFF: 468e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->can_id |= CAN_ERR_BUSOFF; 469e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde can_bus_off(dev); 470e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde break; 471e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde default: 472e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde break; 473e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 474e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 475e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 476e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int flexcan_poll_state(struct net_device *dev, u32 reg_esr) 477e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 478e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv = netdev_priv(dev); 479e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct sk_buff *skb; 480e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct can_frame *cf; 481e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde enum can_state new_state; 482e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde int flt; 483e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 484e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flt = reg_esr & FLEXCAN_ESR_FLT_CONF_MASK; 485e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (likely(flt == FLEXCAN_ESR_FLT_CONF_ACTIVE)) { 486e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (likely(!(reg_esr & (FLEXCAN_ESR_TX_WRN | 487e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_ESR_RX_WRN)))) 488e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde new_state = CAN_STATE_ERROR_ACTIVE; 489e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde else 490e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde new_state = CAN_STATE_ERROR_WARNING; 491e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } else if (unlikely(flt == FLEXCAN_ESR_FLT_CONF_PASSIVE)) 492e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde new_state = CAN_STATE_ERROR_PASSIVE; 493e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde else 494e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde new_state = CAN_STATE_BUS_OFF; 495e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 496e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* state hasn't changed */ 497e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (likely(new_state == priv->can.state)) 498e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 499e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 500e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde skb = alloc_can_err_skb(dev, &cf); 501e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (unlikely(!skb)) 502e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 503e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 504e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde do_state(dev, cf, new_state); 505e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->can.state = new_state; 506e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde netif_receive_skb(skb); 507e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 508e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev->stats.rx_packets++; 509e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev->stats.rx_bytes += cf->can_dlc; 510e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 511e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 1; 512e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 513e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 514e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic void flexcan_read_fifo(const struct net_device *dev, 515e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct can_frame *cf) 516e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 517e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde const struct flexcan_priv *priv = netdev_priv(dev); 518e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 519e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_mb __iomem *mb = ®s->cantxfg[0]; 520e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg_ctrl, reg_id; 521e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 52261e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg_ctrl = flexcan_read(&mb->can_ctrl); 52361e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg_id = flexcan_read(&mb->can_id); 524e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (reg_ctrl & FLEXCAN_MB_CNT_IDE) 525e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->can_id = ((reg_id >> 0) & CAN_EFF_MASK) | CAN_EFF_FLAG; 526e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde else 527e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->can_id = (reg_id >> 18) & CAN_SFF_MASK; 528e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 529e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (reg_ctrl & FLEXCAN_MB_CNT_RTR) 530e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->can_id |= CAN_RTR_FLAG; 531e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->can_dlc = get_can_dlc((reg_ctrl >> 16) & 0xf); 532e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 53361e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com *(__be32 *)(cf->data + 0) = cpu_to_be32(flexcan_read(&mb->data[0])); 53461e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com *(__be32 *)(cf->data + 4) = cpu_to_be32(flexcan_read(&mb->data[1])); 535e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 536e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* mark as read */ 53761e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(FLEXCAN_IFLAG_RX_FIFO_AVAILABLE, ®s->iflag1); 53861e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_read(®s->timer); 539e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 540e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 541e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int flexcan_read_frame(struct net_device *dev) 542e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 543e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct net_device_stats *stats = &dev->stats; 544e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct can_frame *cf; 545e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct sk_buff *skb; 546e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 547e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde skb = alloc_can_skb(dev, &cf); 548e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (unlikely(!skb)) { 549e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde stats->rx_dropped++; 550e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 551e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 552e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 553e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flexcan_read_fifo(dev, cf); 554e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde netif_receive_skb(skb); 555e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 556e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde stats->rx_packets++; 557e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde stats->rx_bytes += cf->can_dlc; 558e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 559adccadb92f0571fd0f9b2ac8011057a7de9e3e63Fabio Baltieri can_led_event(dev, CAN_LED_EVENT_RX); 560adccadb92f0571fd0f9b2ac8011057a7de9e3e63Fabio Baltieri 561e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 1; 562e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 563e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 564e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int flexcan_poll(struct napi_struct *napi, int quota) 565e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 566e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct net_device *dev = napi->dev; 567e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde const struct flexcan_priv *priv = netdev_priv(dev); 568e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 569e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg_iflag1, reg_esr; 570e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde int work_done = 0; 571e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 572e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* 573e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * The error bits are cleared on read, 574e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * use saved value from irq handler. 575e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 57661e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg_esr = flexcan_read(®s->esr) | priv->reg_esr; 577e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 578e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* handle state changes */ 579e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde work_done += flexcan_poll_state(dev, reg_esr); 580e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 581e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* handle RX-FIFO */ 58261e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg_iflag1 = flexcan_read(®s->iflag1); 583e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde while (reg_iflag1 & FLEXCAN_IFLAG_RX_FIFO_AVAILABLE && 584e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde work_done < quota) { 585e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde work_done += flexcan_read_frame(dev); 58661e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg_iflag1 = flexcan_read(®s->iflag1); 587e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 588e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 589e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* report bus errors */ 590e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (flexcan_has_and_handle_berr(priv, reg_esr) && work_done < quota) 591e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde work_done += flexcan_poll_bus_err(dev, reg_esr); 592e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 593e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (work_done < quota) { 594e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde napi_complete(napi); 595e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* enable IRQs */ 59661e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(FLEXCAN_IFLAG_DEFAULT, ®s->imask1); 59761e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(priv->reg_ctrl_default, ®s->ctrl); 598e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 599e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 600e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return work_done; 601e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 602e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 603e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic irqreturn_t flexcan_irq(int irq, void *dev_id) 604e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 605e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct net_device *dev = dev_id; 606e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct net_device_stats *stats = &dev->stats; 607e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv = netdev_priv(dev); 608e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 609e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg_iflag1, reg_esr; 610e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 61161e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg_iflag1 = flexcan_read(®s->iflag1); 61261e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg_esr = flexcan_read(®s->esr); 6136e9d554fa6e481a848358c215f129432262123c0Wolfgang Grandegger /* ACK all bus error and state change IRQ sources */ 6146e9d554fa6e481a848358c215f129432262123c0Wolfgang Grandegger if (reg_esr & FLEXCAN_ESR_ALL_INT) 6156e9d554fa6e481a848358c215f129432262123c0Wolfgang Grandegger flexcan_write(reg_esr & FLEXCAN_ESR_ALL_INT, ®s->esr); 616e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 617e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* 618e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * schedule NAPI in case of: 619e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * - rx IRQ 620e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * - state change IRQ 621e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * - bus error IRQ and bus error reporting is activated 622e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 623e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if ((reg_iflag1 & FLEXCAN_IFLAG_RX_FIFO_AVAILABLE) || 624e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde (reg_esr & FLEXCAN_ESR_ERR_STATE) || 625e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flexcan_has_and_handle_berr(priv, reg_esr)) { 626e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* 627e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * The error bits are cleared on read, 628e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * save them for later use. 629e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 630e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->reg_esr = reg_esr & FLEXCAN_ESR_ERR_BUS; 63161e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(FLEXCAN_IFLAG_DEFAULT & 63261e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com ~FLEXCAN_IFLAG_RX_FIFO_AVAILABLE, ®s->imask1); 63361e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(priv->reg_ctrl_default & ~FLEXCAN_CTRL_ERR_ALL, 634e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde ®s->ctrl); 635e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde napi_schedule(&priv->napi); 636e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 637e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 638e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* FIFO overflow */ 639e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (reg_iflag1 & FLEXCAN_IFLAG_RX_FIFO_OVERFLOW) { 64061e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(FLEXCAN_IFLAG_RX_FIFO_OVERFLOW, ®s->iflag1); 641e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev->stats.rx_over_errors++; 642e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev->stats.rx_errors++; 643e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 644e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 645e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* transmission complete interrupt */ 646e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (reg_iflag1 & (1 << FLEXCAN_TX_BUF_ID)) { 6479a12349663061d25b49e6542d005fa7193a2cb44Reuben Dowle stats->tx_bytes += can_get_echo_skb(dev, 0); 648e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde stats->tx_packets++; 649adccadb92f0571fd0f9b2ac8011057a7de9e3e63Fabio Baltieri can_led_event(dev, CAN_LED_EVENT_TX); 65061e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write((1 << FLEXCAN_TX_BUF_ID), ®s->iflag1); 651e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde netif_wake_queue(dev); 652e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 653e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 654e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return IRQ_HANDLED; 655e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 656e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 657e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic void flexcan_set_bittiming(struct net_device *dev) 658e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 659e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde const struct flexcan_priv *priv = netdev_priv(dev); 660e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde const struct can_bittiming *bt = &priv->can.bittiming; 661e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 662e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg; 663e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 66461e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg = flexcan_read(®s->ctrl); 665e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg &= ~(FLEXCAN_CTRL_PRESDIV(0xff) | 666e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_RJW(0x3) | 667e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_PSEG1(0x7) | 668e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_PSEG2(0x7) | 669e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_PROPSEG(0x7) | 670e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_LPB | 671e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_SMP | 672e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_LOM); 673e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 674e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg |= FLEXCAN_CTRL_PRESDIV(bt->brp - 1) | 675e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_PSEG1(bt->phase_seg1 - 1) | 676e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_PSEG2(bt->phase_seg2 - 1) | 677e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_RJW(bt->sjw - 1) | 678e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_PROPSEG(bt->prop_seg - 1); 679e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 680e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK) 681e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg |= FLEXCAN_CTRL_LPB; 682e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY) 683e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg |= FLEXCAN_CTRL_LOM; 684e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) 685e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg |= FLEXCAN_CTRL_SMP; 686e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 687aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_info(dev, "writing ctrl=0x%08x\n", reg); 68861e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(reg, ®s->ctrl); 689e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 690e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* print chip status */ 691aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "%s: mcr=0x%08x ctrl=0x%08x\n", __func__, 692aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger flexcan_read(®s->mcr), flexcan_read(®s->ctrl)); 693e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 694e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 695e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* 696e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * flexcan_chip_start 697e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 698e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * this functions is entered with clocks enabled 699e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 700e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 701e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int flexcan_chip_start(struct net_device *dev) 702e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 703e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv = netdev_priv(dev); 704e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 705e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde unsigned int i; 706e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde int err; 707e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg_mcr, reg_ctrl; 708e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 709e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* enable module */ 710e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flexcan_chip_enable(priv); 711e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 712e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* soft reset */ 71361e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(FLEXCAN_MCR_SOFTRST, ®s->mcr); 714e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde udelay(10); 715e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 71661e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg_mcr = flexcan_read(®s->mcr); 717e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (reg_mcr & FLEXCAN_MCR_SOFTRST) { 718aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_err(dev, "Failed to softreset can module (mcr=0x%08x)\n", 719aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger reg_mcr); 720e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = -ENODEV; 721e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde goto out; 722e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 723e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 724e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flexcan_set_bittiming(dev); 725e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 726e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* 727e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * MCR 728e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 729e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * enable freeze 730e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * enable fifo 731e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * halt now 732e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * only supervisor access 733e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * enable warning int 734e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * choose format C 7359a12349663061d25b49e6542d005fa7193a2cb44Reuben Dowle * disable local echo 736e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 737e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 73861e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg_mcr = flexcan_read(®s->mcr); 739e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg_mcr |= FLEXCAN_MCR_FRZ | FLEXCAN_MCR_FEN | FLEXCAN_MCR_HALT | 740e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_MCR_SUPV | FLEXCAN_MCR_WRN_EN | 7419a12349663061d25b49e6542d005fa7193a2cb44Reuben Dowle FLEXCAN_MCR_IDAM_C | FLEXCAN_MCR_SRX_DIS; 742aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "%s: writing mcr=0x%08x", __func__, reg_mcr); 74361e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(reg_mcr, ®s->mcr); 744e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 745e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* 746e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * CTRL 747e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 748e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * disable timer sync feature 749e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 750e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * disable auto busoff recovery 751e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * transmit lowest buffer first 752e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 753e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * enable tx and rx warning interrupt 754e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * enable bus off interrupt 755e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * (== FLEXCAN_CTRL_ERR_STATE) 756e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 75761e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg_ctrl = flexcan_read(®s->ctrl); 758e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg_ctrl &= ~FLEXCAN_CTRL_TSYN; 759e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg_ctrl |= FLEXCAN_CTRL_BOFF_REC | FLEXCAN_CTRL_LBUF | 7604f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandegger FLEXCAN_CTRL_ERR_STATE; 7614f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandegger /* 7624f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandegger * enable the "error interrupt" (FLEXCAN_CTRL_ERR_MSK), 7634f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandegger * on most Flexcan cores, too. Otherwise we don't get 7644f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandegger * any error warning or passive interrupts. 7654f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandegger */ 7664f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandegger if (priv->devtype_data->features & FLEXCAN_HAS_BROKEN_ERR_STATE || 7674f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandegger priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING) 7684f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandegger reg_ctrl |= FLEXCAN_CTRL_ERR_MSK; 769e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 770e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* save for later use */ 771e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->reg_ctrl_default = reg_ctrl; 772aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "%s: writing ctrl=0x%08x", __func__, reg_ctrl); 77361e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(reg_ctrl, ®s->ctrl); 774e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 775e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde for (i = 0; i < ARRAY_SIZE(regs->cantxfg); i++) { 77661e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(0, ®s->cantxfg[i].can_ctrl); 77761e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(0, ®s->cantxfg[i].can_id); 77861e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(0, ®s->cantxfg[i].data[0]); 77961e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(0, ®s->cantxfg[i].data[1]); 780e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 781e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* put MB into rx queue */ 78261e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(FLEXCAN_MB_CNT_CODE(0x4), 78361e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com ®s->cantxfg[i].can_ctrl); 784e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 785e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 786e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* acceptance mask/acceptance code (accept everything) */ 78761e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(0x0, ®s->rxgmask); 78861e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(0x0, ®s->rx14mask); 78961e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(0x0, ®s->rx15mask); 790e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 7914f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandegger if (priv->devtype_data->features & FLEXCAN_HAS_V10_FEATURES) 79230c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang flexcan_write(0x0, ®s->rxfgmask); 79330c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang 794b7c4114b07bbacfe0aee1d04ad1ade9e42309620Fabio Estevam if (priv->reg_xceiver) { 795b7c4114b07bbacfe0aee1d04ad1ade9e42309620Fabio Estevam err = regulator_enable(priv->reg_xceiver); 796b7c4114b07bbacfe0aee1d04ad1ade9e42309620Fabio Estevam if (err) 797b7c4114b07bbacfe0aee1d04ad1ade9e42309620Fabio Estevam goto out; 798b7c4114b07bbacfe0aee1d04ad1ade9e42309620Fabio Estevam } 799e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 800e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* synchronize with the can bus */ 80161e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg_mcr = flexcan_read(®s->mcr); 802e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg_mcr &= ~FLEXCAN_MCR_HALT; 80361e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(reg_mcr, ®s->mcr); 804e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 805e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->can.state = CAN_STATE_ERROR_ACTIVE; 806e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 807e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* enable FIFO interrupts */ 80861e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(FLEXCAN_IFLAG_DEFAULT, ®s->imask1); 809e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 810e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* print chip status */ 811aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "%s: reading mcr=0x%08x ctrl=0x%08x\n", __func__, 812aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger flexcan_read(®s->mcr), flexcan_read(®s->ctrl)); 813e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 814e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 815e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 816e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde out: 817e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flexcan_chip_disable(priv); 818e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return err; 819e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 820e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 821e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* 822e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * flexcan_chip_stop 823e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 824e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * this functions is entered with clocks enabled 825e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 826e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 827e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic void flexcan_chip_stop(struct net_device *dev) 828e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 829e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv = netdev_priv(dev); 830e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 831e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg; 832e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 833e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* Disable all interrupts */ 83461e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(0, ®s->imask1); 835e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 836e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* Disable + halt module */ 83761e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg = flexcan_read(®s->mcr); 838e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg |= FLEXCAN_MCR_MDIS | FLEXCAN_MCR_HALT; 83961e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(reg, ®s->mcr); 840e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 841b7c4114b07bbacfe0aee1d04ad1ade9e42309620Fabio Estevam if (priv->reg_xceiver) 842b7c4114b07bbacfe0aee1d04ad1ade9e42309620Fabio Estevam regulator_disable(priv->reg_xceiver); 843e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->can.state = CAN_STATE_STOPPED; 844e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 845e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return; 846e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 847e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 848e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int flexcan_open(struct net_device *dev) 849e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 850e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv = netdev_priv(dev); 851e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde int err; 852e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 8533d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar clk_prepare_enable(priv->clk_ipg); 8543d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar clk_prepare_enable(priv->clk_per); 855e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 856e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = open_candev(dev); 857e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (err) 858e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde goto out; 859e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 860e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = request_irq(dev->irq, flexcan_irq, IRQF_SHARED, dev->name, dev); 861e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (err) 862e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde goto out_close; 863e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 864e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* start chip and queuing */ 865e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = flexcan_chip_start(dev); 866e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (err) 867e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde goto out_close; 868adccadb92f0571fd0f9b2ac8011057a7de9e3e63Fabio Baltieri 869adccadb92f0571fd0f9b2ac8011057a7de9e3e63Fabio Baltieri can_led_event(dev, CAN_LED_EVENT_OPEN); 870adccadb92f0571fd0f9b2ac8011057a7de9e3e63Fabio Baltieri 871e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde napi_enable(&priv->napi); 872e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde netif_start_queue(dev); 873e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 874e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 875e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 876e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde out_close: 877e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde close_candev(dev); 878e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde out: 8793d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar clk_disable_unprepare(priv->clk_per); 8803d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar clk_disable_unprepare(priv->clk_ipg); 881e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 882e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return err; 883e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 884e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 885e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int flexcan_close(struct net_device *dev) 886e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 887e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv = netdev_priv(dev); 888e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 889e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde netif_stop_queue(dev); 890e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde napi_disable(&priv->napi); 891e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flexcan_chip_stop(dev); 892e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 893e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde free_irq(dev->irq, dev); 8943d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar clk_disable_unprepare(priv->clk_per); 8953d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar clk_disable_unprepare(priv->clk_ipg); 896e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 897e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde close_candev(dev); 898e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 899adccadb92f0571fd0f9b2ac8011057a7de9e3e63Fabio Baltieri can_led_event(dev, CAN_LED_EVENT_STOP); 900adccadb92f0571fd0f9b2ac8011057a7de9e3e63Fabio Baltieri 901e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 902e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 903e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 904e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int flexcan_set_mode(struct net_device *dev, enum can_mode mode) 905e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 906e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde int err; 907e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 908e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde switch (mode) { 909e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde case CAN_MODE_START: 910e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = flexcan_chip_start(dev); 911e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (err) 912e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return err; 913e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 914e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde netif_wake_queue(dev); 915e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde break; 916e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 917e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde default: 918e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return -EOPNOTSUPP; 919e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 920e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 921e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 922e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 923e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 924e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic const struct net_device_ops flexcan_netdev_ops = { 925e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .ndo_open = flexcan_open, 926e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .ndo_stop = flexcan_close, 927e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .ndo_start_xmit = flexcan_start_xmit, 928e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde}; 929e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 9303c8ac0f2ad53a96ac58efe7c98fac2986d081dfcBill Pembertonstatic int register_flexcandev(struct net_device *dev) 931e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 932e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv = netdev_priv(dev); 933e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 934e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg, err; 935e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 9363d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar clk_prepare_enable(priv->clk_ipg); 9373d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar clk_prepare_enable(priv->clk_per); 938e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 939e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* select "bus clock", chip must be disabled */ 940e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flexcan_chip_disable(priv); 94161e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg = flexcan_read(®s->ctrl); 942e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg |= FLEXCAN_CTRL_CLK_SRC; 94361e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(reg, ®s->ctrl); 944e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 945e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flexcan_chip_enable(priv); 946e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 947e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* set freeze, halt and activate FIFO, restrict register access */ 94861e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg = flexcan_read(®s->mcr); 949e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg |= FLEXCAN_MCR_FRZ | FLEXCAN_MCR_HALT | 950e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_MCR_FEN | FLEXCAN_MCR_SUPV; 95161e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(reg, ®s->mcr); 952e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 953e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* 954e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * Currently we only support newer versions of this core 955e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * featuring a RX FIFO. Older cores found on some Coldfire 956e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * derivates are not yet supported. 957e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 95861e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg = flexcan_read(®s->mcr); 959e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (!(reg & FLEXCAN_MCR_FEN)) { 960aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_err(dev, "Could not enable RX FIFO, unsupported core\n"); 961e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = -ENODEV; 962e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde goto out; 963e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 964e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 965e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = register_candev(dev); 966e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 967e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde out: 968e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* disable core and turn off clocks */ 969e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flexcan_chip_disable(priv); 9703d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar clk_disable_unprepare(priv->clk_per); 9713d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar clk_disable_unprepare(priv->clk_ipg); 972e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 973e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return err; 974e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 975e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 9763c8ac0f2ad53a96ac58efe7c98fac2986d081dfcBill Pembertonstatic void unregister_flexcandev(struct net_device *dev) 977e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 978e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde unregister_candev(dev); 979e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 980e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 98130c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wangstatic const struct of_device_id flexcan_of_match[] = { 98230c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang { .compatible = "fsl,p1010-flexcan", .data = &fsl_p1010_devtype_data, }, 9834f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandegger { .compatible = "fsl,imx28-flexcan", .data = &fsl_imx28_devtype_data, }, 98430c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang { .compatible = "fsl,imx6q-flexcan", .data = &fsl_imx6q_devtype_data, }, 98530c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang { /* sentinel */ }, 98630c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang}; 9874358a9dc94cd70fa88797c87ed911bc8d866f37dMarc Kleine-BuddeMODULE_DEVICE_TABLE(of, flexcan_of_match); 98830c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang 98930c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wangstatic const struct platform_device_id flexcan_id_table[] = { 99030c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang { .name = "flexcan", .driver_data = (kernel_ulong_t)&fsl_p1010_devtype_data, }, 99130c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang { /* sentinel */ }, 99230c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang}; 9934358a9dc94cd70fa88797c87ed911bc8d866f37dMarc Kleine-BuddeMODULE_DEVICE_TABLE(platform, flexcan_id_table); 99430c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang 9953c8ac0f2ad53a96ac58efe7c98fac2986d081dfcBill Pembertonstatic int flexcan_probe(struct platform_device *pdev) 996e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 99730c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang const struct of_device_id *of_id; 998dda0b3bd1cbb66ee869d589f7d719f703d7c38a1Marc Kleine-Budde const struct flexcan_devtype_data *devtype_data; 999e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct net_device *dev; 1000e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv; 1001e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct resource *mem; 10023d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar struct clk *clk_ipg = NULL, *clk_per = NULL; 1003e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde void __iomem *base; 1004e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde resource_size_t mem_size; 1005e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde int err, irq; 100697efe9aef1ae8922666d32f28d712745a86859e9holt@sgi.com u32 clock_freq = 0; 100797efe9aef1ae8922666d32f28d712745a86859e9holt@sgi.com 1008afc016d8360ceb19a1f37bf6579d5850d47d582dHui Wang if (pdev->dev.of_node) 1009afc016d8360ceb19a1f37bf6579d5850d47d582dHui Wang of_property_read_u32(pdev->dev.of_node, 1010afc016d8360ceb19a1f37bf6579d5850d47d582dHui Wang "clock-frequency", &clock_freq); 101197efe9aef1ae8922666d32f28d712745a86859e9holt@sgi.com 101297efe9aef1ae8922666d32f28d712745a86859e9holt@sgi.com if (!clock_freq) { 10133d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar clk_ipg = devm_clk_get(&pdev->dev, "ipg"); 10143d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar if (IS_ERR(clk_ipg)) { 10153d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar dev_err(&pdev->dev, "no ipg clock defined\n"); 10163d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar err = PTR_ERR(clk_ipg); 10173d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar goto failed_clock; 10183d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar } 10193d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar clock_freq = clk_get_rate(clk_ipg); 10203d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar 10213d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar clk_per = devm_clk_get(&pdev->dev, "per"); 10223d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar if (IS_ERR(clk_per)) { 10233d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar dev_err(&pdev->dev, "no per clock defined\n"); 10243d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar err = PTR_ERR(clk_per); 102597efe9aef1ae8922666d32f28d712745a86859e9holt@sgi.com goto failed_clock; 102697efe9aef1ae8922666d32f28d712745a86859e9holt@sgi.com } 1027e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 1028e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1029e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1030e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde irq = platform_get_irq(pdev, 0); 1031e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (!mem || irq <= 0) { 1032e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = -ENODEV; 1033e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde goto failed_get; 1034e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 1035e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1036e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde mem_size = resource_size(mem); 1037e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (!request_mem_region(mem->start, mem_size, pdev->name)) { 1038e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = -EBUSY; 10392e4ceec4edaef6e903422792de4f7f37de98cec6Julia Lawall goto failed_get; 1040e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 1041e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1042e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde base = ioremap(mem->start, mem_size); 1043e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (!base) { 1044e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = -ENOMEM; 1045e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde goto failed_map; 1046e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 1047e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 10489a12349663061d25b49e6542d005fa7193a2cb44Reuben Dowle dev = alloc_candev(sizeof(struct flexcan_priv), 1); 1049e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (!dev) { 1050e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = -ENOMEM; 1051e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde goto failed_alloc; 1052e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 1053e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 105430c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang of_id = of_match_device(flexcan_of_match, &pdev->dev); 105530c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang if (of_id) { 105630c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang devtype_data = of_id->data; 105730c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang } else if (pdev->id_entry->driver_data) { 105830c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang devtype_data = (struct flexcan_devtype_data *) 105930c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang pdev->id_entry->driver_data; 106030c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang } else { 106130c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang err = -ENODEV; 106230c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang goto failed_devtype; 106330c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang } 106430c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang 1065e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev->netdev_ops = &flexcan_netdev_ops; 1066e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev->irq = irq; 10679a12349663061d25b49e6542d005fa7193a2cb44Reuben Dowle dev->flags |= IFF_ECHO; 1068e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1069e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv = netdev_priv(dev); 107097efe9aef1ae8922666d32f28d712745a86859e9holt@sgi.com priv->can.clock.freq = clock_freq; 1071e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->can.bittiming_const = &flexcan_bittiming_const; 1072e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->can.do_set_mode = flexcan_set_mode; 1073e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->can.do_get_berr_counter = flexcan_get_berr_counter; 1074e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK | 1075e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde CAN_CTRLMODE_LISTENONLY | CAN_CTRLMODE_3_SAMPLES | 1076e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde CAN_CTRLMODE_BERR_REPORTING; 1077e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->base = base; 1078e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->dev = dev; 10793d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar priv->clk_ipg = clk_ipg; 10803d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar priv->clk_per = clk_per; 1081e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->pdata = pdev->dev.platform_data; 108230c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang priv->devtype_data = devtype_data; 1083e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1084b7c4114b07bbacfe0aee1d04ad1ade9e42309620Fabio Estevam priv->reg_xceiver = devm_regulator_get(&pdev->dev, "xceiver"); 1085b7c4114b07bbacfe0aee1d04ad1ade9e42309620Fabio Estevam if (IS_ERR(priv->reg_xceiver)) 1086b7c4114b07bbacfe0aee1d04ad1ade9e42309620Fabio Estevam priv->reg_xceiver = NULL; 1087b7c4114b07bbacfe0aee1d04ad1ade9e42309620Fabio Estevam 1088e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde netif_napi_add(dev, &priv->napi, flexcan_poll, FLEXCAN_NAPI_WEIGHT); 1089e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1090e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev_set_drvdata(&pdev->dev, dev); 1091e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde SET_NETDEV_DEV(dev, &pdev->dev); 1092e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1093e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = register_flexcandev(dev); 1094e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (err) { 1095e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev_err(&pdev->dev, "registering netdev failed\n"); 1096e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde goto failed_register; 1097e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 1098e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1099adccadb92f0571fd0f9b2ac8011057a7de9e3e63Fabio Baltieri devm_can_led_init(dev); 1100adccadb92f0571fd0f9b2ac8011057a7de9e3e63Fabio Baltieri 1101e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev_info(&pdev->dev, "device registered (reg_base=%p, irq=%d)\n", 1102e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->base, dev->irq); 1103e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1104e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 1105e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1106e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde failed_register: 110730c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang failed_devtype: 1108e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde free_candev(dev); 1109e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde failed_alloc: 1110e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde iounmap(base); 1111e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde failed_map: 1112e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde release_mem_region(mem->start, mem_size); 1113e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde failed_get: 1114e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde failed_clock: 1115e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return err; 1116e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 1117e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 11183c8ac0f2ad53a96ac58efe7c98fac2986d081dfcBill Pembertonstatic int flexcan_remove(struct platform_device *pdev) 1119e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 1120e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct net_device *dev = platform_get_drvdata(pdev); 1121e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv = netdev_priv(dev); 1122e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct resource *mem; 1123e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1124e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde unregister_flexcandev(dev); 1125e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde iounmap(priv->base); 1126e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1127e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1128e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde release_mem_region(mem->start, resource_size(mem)); 1129e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 11309a27586d3d5c3157260b055d057c6f4f6654c72cMarc Kleine-Budde free_candev(dev); 11319a27586d3d5c3157260b055d057c6f4f6654c72cMarc Kleine-Budde 1132e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 1133e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 1134e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1135588e7a8e123da07b6ffe87f156e25afc1c3d7cceFabio Estevam#ifdef CONFIG_PM_SLEEP 1136588e7a8e123da07b6ffe87f156e25afc1c3d7cceFabio Estevamstatic int flexcan_suspend(struct device *device) 11378b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard{ 1138588e7a8e123da07b6ffe87f156e25afc1c3d7cceFabio Estevam struct net_device *dev = dev_get_drvdata(device); 11398b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard struct flexcan_priv *priv = netdev_priv(dev); 11408b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard 11418b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard flexcan_chip_disable(priv); 11428b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard 11438b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard if (netif_running(dev)) { 11448b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard netif_stop_queue(dev); 11458b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard netif_device_detach(dev); 11468b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard } 11478b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard priv->can.state = CAN_STATE_SLEEPING; 11488b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard 11498b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard return 0; 11508b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard} 11518b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard 1152588e7a8e123da07b6ffe87f156e25afc1c3d7cceFabio Estevamstatic int flexcan_resume(struct device *device) 11538b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard{ 1154588e7a8e123da07b6ffe87f156e25afc1c3d7cceFabio Estevam struct net_device *dev = dev_get_drvdata(device); 11558b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard struct flexcan_priv *priv = netdev_priv(dev); 11568b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard 11578b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard priv->can.state = CAN_STATE_ERROR_ACTIVE; 11588b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard if (netif_running(dev)) { 11598b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard netif_device_attach(dev); 11608b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard netif_start_queue(dev); 11618b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard } 11628b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard flexcan_chip_enable(priv); 11638b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard 11648b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard return 0; 11658b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard} 1166588e7a8e123da07b6ffe87f156e25afc1c3d7cceFabio Estevam#endif /* CONFIG_PM_SLEEP */ 1167588e7a8e123da07b6ffe87f156e25afc1c3d7cceFabio Estevam 1168588e7a8e123da07b6ffe87f156e25afc1c3d7cceFabio Estevamstatic SIMPLE_DEV_PM_OPS(flexcan_pm_ops, flexcan_suspend, flexcan_resume); 11698b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard 1170e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic struct platform_driver flexcan_driver = { 1171c8aef4cb788b760331e6df06a5d93389824882b4holt@sgi.com .driver = { 1172c8aef4cb788b760331e6df06a5d93389824882b4holt@sgi.com .name = DRV_NAME, 1173c8aef4cb788b760331e6df06a5d93389824882b4holt@sgi.com .owner = THIS_MODULE, 1174588e7a8e123da07b6ffe87f156e25afc1c3d7cceFabio Estevam .pm = &flexcan_pm_ops, 1175c8aef4cb788b760331e6df06a5d93389824882b4holt@sgi.com .of_match_table = flexcan_of_match, 1176c8aef4cb788b760331e6df06a5d93389824882b4holt@sgi.com }, 1177e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .probe = flexcan_probe, 11783c8ac0f2ad53a96ac58efe7c98fac2986d081dfcBill Pemberton .remove = flexcan_remove, 117930c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang .id_table = flexcan_id_table, 1180e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde}; 1181e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1182871d33725545ca2e402b4526f38f89d041ba930fAxel Linmodule_platform_driver(flexcan_driver); 1183e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1184e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-BuddeMODULE_AUTHOR("Sascha Hauer <kernel@pengutronix.de>, " 1185e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde "Marc Kleine-Budde <kernel@pengutronix.de>"); 1186e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-BuddeMODULE_LICENSE("GPL v2"); 1187e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-BuddeMODULE_DESCRIPTION("CAN port driver for flexcan based chip"); 1188