flexcan.c revision 4c728d804c4b9d1ae7f76e8f32c419bc21a6e540
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) 654c728d804c4b9d1ae7f76e8f32c419bc21a6e540Marc Kleine-Budde#define FLEXCAN_MCR_MAXMB(x) ((x) & 0x7f) 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 */ 12825e924450fcb23c11c07c95ea8964dd9f174652eDavid Jander/* Errata ERR005829 step7: Reserve first valid MB */ 12925e924450fcb23c11c07c95ea8964dd9f174652eDavid Jander#define FLEXCAN_TX_BUF_RESERVED 8 13025e924450fcb23c11c07c95ea8964dd9f174652eDavid Jander#define FLEXCAN_TX_BUF_ID 9 131e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_IFLAG_BUF(x) BIT(x) 132e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_IFLAG_RX_FIFO_OVERFLOW BIT(7) 133e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_IFLAG_RX_FIFO_WARN BIT(6) 134e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_IFLAG_RX_FIFO_AVAILABLE BIT(5) 135e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_IFLAG_DEFAULT \ 136e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde (FLEXCAN_IFLAG_RX_FIFO_OVERFLOW | FLEXCAN_IFLAG_RX_FIFO_AVAILABLE | \ 137e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_IFLAG_BUF(FLEXCAN_TX_BUF_ID)) 138e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 139e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* FLEXCAN message buffers */ 140e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MB_CNT_CODE(x) (((x) & 0xf) << 24) 141c32fe4ad3e4861b2bfa1f44114c564935a123ddaMarc Kleine-Budde#define FLEXCAN_MB_CODE_RX_INACTIVE (0x0 << 24) 142c32fe4ad3e4861b2bfa1f44114c564935a123ddaMarc Kleine-Budde#define FLEXCAN_MB_CODE_RX_EMPTY (0x4 << 24) 143c32fe4ad3e4861b2bfa1f44114c564935a123ddaMarc Kleine-Budde#define FLEXCAN_MB_CODE_RX_FULL (0x2 << 24) 144c32fe4ad3e4861b2bfa1f44114c564935a123ddaMarc Kleine-Budde#define FLEXCAN_MB_CODE_RX_OVERRRUN (0x6 << 24) 145c32fe4ad3e4861b2bfa1f44114c564935a123ddaMarc Kleine-Budde#define FLEXCAN_MB_CODE_RX_RANSWER (0xa << 24) 146c32fe4ad3e4861b2bfa1f44114c564935a123ddaMarc Kleine-Budde 147c32fe4ad3e4861b2bfa1f44114c564935a123ddaMarc Kleine-Budde#define FLEXCAN_MB_CODE_TX_INACTIVE (0x8 << 24) 148c32fe4ad3e4861b2bfa1f44114c564935a123ddaMarc Kleine-Budde#define FLEXCAN_MB_CODE_TX_ABORT (0x9 << 24) 149c32fe4ad3e4861b2bfa1f44114c564935a123ddaMarc Kleine-Budde#define FLEXCAN_MB_CODE_TX_DATA (0xc << 24) 150c32fe4ad3e4861b2bfa1f44114c564935a123ddaMarc Kleine-Budde#define FLEXCAN_MB_CODE_TX_TANSWER (0xe << 24) 151c32fe4ad3e4861b2bfa1f44114c564935a123ddaMarc Kleine-Budde 152e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MB_CNT_SRR BIT(22) 153e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MB_CNT_IDE BIT(21) 154e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MB_CNT_RTR BIT(20) 155e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MB_CNT_LENGTH(x) (((x) & 0xf) << 16) 156e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MB_CNT_TIMESTAMP(x) ((x) & 0xffff) 157e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 158e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MB_CODE_MASK (0xf0ffffff) 159e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1609b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde#define FLEXCAN_TIMEOUT_US (50) 1619b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde 162bb698ca41ba574b3066ebbc5766e5980ae0051caWolfgang Grandegger/* 163bb698ca41ba574b3066ebbc5766e5980ae0051caWolfgang Grandegger * FLEXCAN hardware feature flags 164bb698ca41ba574b3066ebbc5766e5980ae0051caWolfgang Grandegger * 165bb698ca41ba574b3066ebbc5766e5980ae0051caWolfgang Grandegger * Below is some version info we got: 166bb698ca41ba574b3066ebbc5766e5980ae0051caWolfgang Grandegger * SOC Version IP-Version Glitch- [TR]WRN_INT 167bb698ca41ba574b3066ebbc5766e5980ae0051caWolfgang Grandegger * Filter? connected? 168bb698ca41ba574b3066ebbc5766e5980ae0051caWolfgang Grandegger * MX25 FlexCAN2 03.00.00.00 no no 169bb698ca41ba574b3066ebbc5766e5980ae0051caWolfgang Grandegger * MX28 FlexCAN2 03.00.04.00 yes yes 170bb698ca41ba574b3066ebbc5766e5980ae0051caWolfgang Grandegger * MX35 FlexCAN2 03.00.00.00 no no 171bb698ca41ba574b3066ebbc5766e5980ae0051caWolfgang Grandegger * MX53 FlexCAN2 03.00.00.00 yes no 172bb698ca41ba574b3066ebbc5766e5980ae0051caWolfgang Grandegger * MX6s FlexCAN3 10.00.12.00 yes yes 173bb698ca41ba574b3066ebbc5766e5980ae0051caWolfgang Grandegger * 174bb698ca41ba574b3066ebbc5766e5980ae0051caWolfgang Grandegger * Some SOCs do not have the RX_WARN & TX_WARN interrupt line connected. 175bb698ca41ba574b3066ebbc5766e5980ae0051caWolfgang Grandegger */ 1764f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandegger#define FLEXCAN_HAS_V10_FEATURES BIT(1) /* For core version >= 10 */ 177bb698ca41ba574b3066ebbc5766e5980ae0051caWolfgang Grandegger#define FLEXCAN_HAS_BROKEN_ERR_STATE BIT(2) /* [TR]WRN_INT not connected */ 1784f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandegger 179e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* Structure of the message buffer */ 180e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestruct flexcan_mb { 181e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 can_ctrl; 182e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 can_id; 183e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 data[2]; 184e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde}; 185e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 186e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* Structure of the hardware registers */ 187e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestruct flexcan_regs { 188e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 mcr; /* 0x00 */ 189e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 ctrl; /* 0x04 */ 190e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 timer; /* 0x08 */ 191e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 _reserved1; /* 0x0c */ 192e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 rxgmask; /* 0x10 */ 193e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 rx14mask; /* 0x14 */ 194e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 rx15mask; /* 0x18 */ 195e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 ecr; /* 0x1c */ 196e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 esr; /* 0x20 */ 197e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 imask2; /* 0x24 */ 198e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 imask1; /* 0x28 */ 199e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 iflag2; /* 0x2c */ 200e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 iflag1; /* 0x30 */ 20130c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang u32 crl2; /* 0x34 */ 20230c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang u32 esr2; /* 0x38 */ 20330c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang u32 imeur; /* 0x3c */ 20430c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang u32 lrfr; /* 0x40 */ 20530c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang u32 crcr; /* 0x44 */ 20630c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang u32 rxfgmask; /* 0x48 */ 20730c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang u32 rxfir; /* 0x4c */ 20830c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang u32 _reserved3[12]; 209e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_mb cantxfg[64]; 210e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde}; 211e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 21230c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wangstruct flexcan_devtype_data { 2134f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandegger u32 features; /* hardware controller features */ 21430c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang}; 21530c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang 216e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestruct flexcan_priv { 217e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct can_priv can; 218e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct net_device *dev; 219e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct napi_struct napi; 220e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 221e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde void __iomem *base; 222e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg_esr; 223e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg_ctrl_default; 224e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 2253d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar struct clk *clk_ipg; 2263d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar struct clk *clk_per; 227e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_platform_data *pdata; 228dda0b3bd1cbb66ee869d589f7d719f703d7c38a1Marc Kleine-Budde const struct flexcan_devtype_data *devtype_data; 229b7c4114b07bbacfe0aee1d04ad1ade9e42309620Fabio Estevam struct regulator *reg_xceiver; 23030c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang}; 23130c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang 23230c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wangstatic struct flexcan_devtype_data fsl_p1010_devtype_data = { 2334f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandegger .features = FLEXCAN_HAS_BROKEN_ERR_STATE, 23430c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang}; 2354f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandeggerstatic struct flexcan_devtype_data fsl_imx28_devtype_data; 23630c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wangstatic struct flexcan_devtype_data fsl_imx6q_devtype_data = { 237bb698ca41ba574b3066ebbc5766e5980ae0051caWolfgang Grandegger .features = FLEXCAN_HAS_V10_FEATURES, 238e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde}; 239e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 240194b9a4cb91713ddb60c9f98f7212f6d8cb8e05fMarc Kleine-Buddestatic const struct can_bittiming_const flexcan_bittiming_const = { 241e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .name = DRV_NAME, 242e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .tseg1_min = 4, 243e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .tseg1_max = 16, 244e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .tseg2_min = 2, 245e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .tseg2_max = 8, 246e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .sjw_max = 4, 247e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .brp_min = 1, 248e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .brp_max = 256, 249e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .brp_inc = 1, 250e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde}; 251e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 252e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* 2530e4b949e6620689b1d3142e20bca2c9d1f918fdaArnd Bergmann * Abstract off the read/write for arm versus ppc. This 2540e4b949e6620689b1d3142e20bca2c9d1f918fdaArnd Bergmann * assumes that PPC uses big-endian registers and everything 2550e4b949e6620689b1d3142e20bca2c9d1f918fdaArnd Bergmann * else uses little-endian registers, independent of CPU 2560e4b949e6620689b1d3142e20bca2c9d1f918fdaArnd Bergmann * endianess. 25761e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com */ 2580e4b949e6620689b1d3142e20bca2c9d1f918fdaArnd Bergmann#if defined(CONFIG_PPC) 25961e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.comstatic inline u32 flexcan_read(void __iomem *addr) 26061e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com{ 26161e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com return in_be32(addr); 26261e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com} 26361e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com 26461e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.comstatic inline void flexcan_write(u32 val, void __iomem *addr) 26561e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com{ 26661e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com out_be32(addr, val); 26761e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com} 26861e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com#else 26961e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.comstatic inline u32 flexcan_read(void __iomem *addr) 27061e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com{ 27161e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com return readl(addr); 27261e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com} 27361e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com 27461e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.comstatic inline void flexcan_write(u32 val, void __iomem *addr) 27561e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com{ 27661e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com writel(val, addr); 27761e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com} 27861e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com#endif 27961e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com 280f003698e23f6f56a791774f14d0ac35d04872490Marc Kleine-Buddestatic inline int flexcan_transceiver_enable(const struct flexcan_priv *priv) 281f003698e23f6f56a791774f14d0ac35d04872490Marc Kleine-Budde{ 282f003698e23f6f56a791774f14d0ac35d04872490Marc Kleine-Budde if (!priv->reg_xceiver) 283f003698e23f6f56a791774f14d0ac35d04872490Marc Kleine-Budde return 0; 284f003698e23f6f56a791774f14d0ac35d04872490Marc Kleine-Budde 285f003698e23f6f56a791774f14d0ac35d04872490Marc Kleine-Budde return regulator_enable(priv->reg_xceiver); 286f003698e23f6f56a791774f14d0ac35d04872490Marc Kleine-Budde} 287f003698e23f6f56a791774f14d0ac35d04872490Marc Kleine-Budde 288f003698e23f6f56a791774f14d0ac35d04872490Marc Kleine-Buddestatic inline int flexcan_transceiver_disable(const struct flexcan_priv *priv) 289f003698e23f6f56a791774f14d0ac35d04872490Marc Kleine-Budde{ 290f003698e23f6f56a791774f14d0ac35d04872490Marc Kleine-Budde if (!priv->reg_xceiver) 291f003698e23f6f56a791774f14d0ac35d04872490Marc Kleine-Budde return 0; 292f003698e23f6f56a791774f14d0ac35d04872490Marc Kleine-Budde 293f003698e23f6f56a791774f14d0ac35d04872490Marc Kleine-Budde return regulator_disable(priv->reg_xceiver); 294f003698e23f6f56a791774f14d0ac35d04872490Marc Kleine-Budde} 295f003698e23f6f56a791774f14d0ac35d04872490Marc Kleine-Budde 296e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic inline int flexcan_has_and_handle_berr(const struct flexcan_priv *priv, 297e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg_esr) 298e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 299e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING) && 300e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde (reg_esr & FLEXCAN_ESR_ERR_BUS); 301e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 302e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 3039b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Buddestatic int flexcan_chip_enable(struct flexcan_priv *priv) 304e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 305e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 3069b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde unsigned int timeout = FLEXCAN_TIMEOUT_US / 10; 307e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg; 308e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 30961e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg = flexcan_read(®s->mcr); 310e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg &= ~FLEXCAN_MCR_MDIS; 31161e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(reg, ®s->mcr); 312e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 3139b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde while (timeout-- && (flexcan_read(®s->mcr) & FLEXCAN_MCR_LPM_ACK)) 3148badd65e48c90d66587359d5329c2813088c0f50David Jander udelay(10); 3159b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde 3169b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde if (flexcan_read(®s->mcr) & FLEXCAN_MCR_LPM_ACK) 3179b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde return -ETIMEDOUT; 3189b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde 3199b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde return 0; 320e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 321e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 3229b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Buddestatic int flexcan_chip_disable(struct flexcan_priv *priv) 323e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 324e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 3259b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde unsigned int timeout = FLEXCAN_TIMEOUT_US / 10; 326e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg; 327e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 32861e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg = flexcan_read(®s->mcr); 329e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg |= FLEXCAN_MCR_MDIS; 33061e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(reg, ®s->mcr); 3319b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde 3329b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde while (timeout-- && !(flexcan_read(®s->mcr) & FLEXCAN_MCR_LPM_ACK)) 3338badd65e48c90d66587359d5329c2813088c0f50David Jander udelay(10); 3349b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde 3359b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde if (!(flexcan_read(®s->mcr) & FLEXCAN_MCR_LPM_ACK)) 3369b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde return -ETIMEDOUT; 3379b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde 3389b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde return 0; 339e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 340e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 341b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Buddestatic int flexcan_chip_freeze(struct flexcan_priv *priv) 342b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde{ 343b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 344b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde unsigned int timeout = 1000 * 1000 * 10 / priv->can.bittiming.bitrate; 345b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde u32 reg; 346b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde 347b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde reg = flexcan_read(®s->mcr); 348b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde reg |= FLEXCAN_MCR_HALT; 349b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde flexcan_write(reg, ®s->mcr); 350b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde 351b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde while (timeout-- && !(flexcan_read(®s->mcr) & FLEXCAN_MCR_FRZ_ACK)) 3528badd65e48c90d66587359d5329c2813088c0f50David Jander udelay(100); 353b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde 354b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde if (!(flexcan_read(®s->mcr) & FLEXCAN_MCR_FRZ_ACK)) 355b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde return -ETIMEDOUT; 356b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde 357b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde return 0; 358b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde} 359b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde 360b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Buddestatic int flexcan_chip_unfreeze(struct flexcan_priv *priv) 361b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde{ 362b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 363b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde unsigned int timeout = FLEXCAN_TIMEOUT_US / 10; 364b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde u32 reg; 365b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde 366b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde reg = flexcan_read(®s->mcr); 367b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde reg &= ~FLEXCAN_MCR_HALT; 368b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde flexcan_write(reg, ®s->mcr); 369b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde 370b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde while (timeout-- && (flexcan_read(®s->mcr) & FLEXCAN_MCR_FRZ_ACK)) 3718badd65e48c90d66587359d5329c2813088c0f50David Jander udelay(10); 372b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde 373b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde if (flexcan_read(®s->mcr) & FLEXCAN_MCR_FRZ_ACK) 374b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde return -ETIMEDOUT; 375b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde 376b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde return 0; 377b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde} 378b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde 3794b5b82274a17f0ebbf02378df2ba7f36a3f5af19Marc Kleine-Buddestatic int flexcan_chip_softreset(struct flexcan_priv *priv) 3804b5b82274a17f0ebbf02378df2ba7f36a3f5af19Marc Kleine-Budde{ 3814b5b82274a17f0ebbf02378df2ba7f36a3f5af19Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 3824b5b82274a17f0ebbf02378df2ba7f36a3f5af19Marc Kleine-Budde unsigned int timeout = FLEXCAN_TIMEOUT_US / 10; 3834b5b82274a17f0ebbf02378df2ba7f36a3f5af19Marc Kleine-Budde 3844b5b82274a17f0ebbf02378df2ba7f36a3f5af19Marc Kleine-Budde flexcan_write(FLEXCAN_MCR_SOFTRST, ®s->mcr); 3854b5b82274a17f0ebbf02378df2ba7f36a3f5af19Marc Kleine-Budde while (timeout-- && (flexcan_read(®s->mcr) & FLEXCAN_MCR_SOFTRST)) 3868badd65e48c90d66587359d5329c2813088c0f50David Jander udelay(10); 3874b5b82274a17f0ebbf02378df2ba7f36a3f5af19Marc Kleine-Budde 3884b5b82274a17f0ebbf02378df2ba7f36a3f5af19Marc Kleine-Budde if (flexcan_read(®s->mcr) & FLEXCAN_MCR_SOFTRST) 3894b5b82274a17f0ebbf02378df2ba7f36a3f5af19Marc Kleine-Budde return -ETIMEDOUT; 3904b5b82274a17f0ebbf02378df2ba7f36a3f5af19Marc Kleine-Budde 3914b5b82274a17f0ebbf02378df2ba7f36a3f5af19Marc Kleine-Budde return 0; 3924b5b82274a17f0ebbf02378df2ba7f36a3f5af19Marc Kleine-Budde} 3934b5b82274a17f0ebbf02378df2ba7f36a3f5af19Marc Kleine-Budde 394e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int flexcan_get_berr_counter(const struct net_device *dev, 395e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct can_berr_counter *bec) 396e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 397e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde const struct flexcan_priv *priv = netdev_priv(dev); 398e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 39961e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com u32 reg = flexcan_read(®s->ecr); 400e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 401e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde bec->txerr = (reg >> 0) & 0xff; 402e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde bec->rxerr = (reg >> 8) & 0xff; 403e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 404e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 405e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 406e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 407e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int flexcan_start_xmit(struct sk_buff *skb, struct net_device *dev) 408e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 409e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde const struct flexcan_priv *priv = netdev_priv(dev); 410e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 411e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct can_frame *cf = (struct can_frame *)skb->data; 412e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 can_id; 413e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 ctrl = FLEXCAN_MB_CNT_CODE(0xc) | (cf->can_dlc << 16); 414e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 415e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (can_dropped_invalid_skb(dev, skb)) 416e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return NETDEV_TX_OK; 417e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 418e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde netif_stop_queue(dev); 419e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 420e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (cf->can_id & CAN_EFF_FLAG) { 421e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde can_id = cf->can_id & CAN_EFF_MASK; 422e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde ctrl |= FLEXCAN_MB_CNT_IDE | FLEXCAN_MB_CNT_SRR; 423e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } else { 424e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde can_id = (cf->can_id & CAN_SFF_MASK) << 18; 425e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 426e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 427e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (cf->can_id & CAN_RTR_FLAG) 428e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde ctrl |= FLEXCAN_MB_CNT_RTR; 429e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 430e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (cf->can_dlc > 0) { 431e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 data = be32_to_cpup((__be32 *)&cf->data[0]); 43261e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(data, ®s->cantxfg[FLEXCAN_TX_BUF_ID].data[0]); 433e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 434e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (cf->can_dlc > 3) { 435e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 data = be32_to_cpup((__be32 *)&cf->data[4]); 43661e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(data, ®s->cantxfg[FLEXCAN_TX_BUF_ID].data[1]); 437e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 438e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 4399a12349663061d25b49e6542d005fa7193a2cb44Reuben Dowle can_put_echo_skb(skb, dev, 0); 4409a12349663061d25b49e6542d005fa7193a2cb44Reuben Dowle 44161e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(can_id, ®s->cantxfg[FLEXCAN_TX_BUF_ID].can_id); 44261e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(ctrl, ®s->cantxfg[FLEXCAN_TX_BUF_ID].can_ctrl); 443e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 44425e924450fcb23c11c07c95ea8964dd9f174652eDavid Jander /* Errata ERR005829 step8: 44525e924450fcb23c11c07c95ea8964dd9f174652eDavid Jander * Write twice INACTIVE(0x8) code to first MB. 44625e924450fcb23c11c07c95ea8964dd9f174652eDavid Jander */ 44725e924450fcb23c11c07c95ea8964dd9f174652eDavid Jander flexcan_write(FLEXCAN_MB_CODE_TX_INACTIVE, 44825e924450fcb23c11c07c95ea8964dd9f174652eDavid Jander ®s->cantxfg[FLEXCAN_TX_BUF_RESERVED].can_ctrl); 44925e924450fcb23c11c07c95ea8964dd9f174652eDavid Jander flexcan_write(FLEXCAN_MB_CODE_TX_INACTIVE, 45025e924450fcb23c11c07c95ea8964dd9f174652eDavid Jander ®s->cantxfg[FLEXCAN_TX_BUF_RESERVED].can_ctrl); 45125e924450fcb23c11c07c95ea8964dd9f174652eDavid Jander 452e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return NETDEV_TX_OK; 453e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 454e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 455e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic void do_bus_err(struct net_device *dev, 456e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct can_frame *cf, u32 reg_esr) 457e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 458e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv = netdev_priv(dev); 459e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde int rx_errors = 0, tx_errors = 0; 460e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 461e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR; 462e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 463e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (reg_esr & FLEXCAN_ESR_BIT1_ERR) { 464aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "BIT1_ERR irq\n"); 465e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->data[2] |= CAN_ERR_PROT_BIT1; 466e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde tx_errors = 1; 467e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 468e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (reg_esr & FLEXCAN_ESR_BIT0_ERR) { 469aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "BIT0_ERR irq\n"); 470e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->data[2] |= CAN_ERR_PROT_BIT0; 471e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde tx_errors = 1; 472e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 473e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (reg_esr & FLEXCAN_ESR_ACK_ERR) { 474aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "ACK_ERR irq\n"); 475e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->can_id |= CAN_ERR_ACK; 476e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->data[3] |= CAN_ERR_PROT_LOC_ACK; 477e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde tx_errors = 1; 478e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 479e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (reg_esr & FLEXCAN_ESR_CRC_ERR) { 480aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "CRC_ERR irq\n"); 481e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->data[2] |= CAN_ERR_PROT_BIT; 482e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->data[3] |= CAN_ERR_PROT_LOC_CRC_SEQ; 483e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde rx_errors = 1; 484e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 485e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (reg_esr & FLEXCAN_ESR_FRM_ERR) { 486aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "FRM_ERR irq\n"); 487e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->data[2] |= CAN_ERR_PROT_FORM; 488e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde rx_errors = 1; 489e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 490e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (reg_esr & FLEXCAN_ESR_STF_ERR) { 491aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "STF_ERR irq\n"); 492e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->data[2] |= CAN_ERR_PROT_STUFF; 493e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde rx_errors = 1; 494e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 495e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 496e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->can.can_stats.bus_error++; 497e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (rx_errors) 498e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev->stats.rx_errors++; 499e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (tx_errors) 500e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev->stats.tx_errors++; 501e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 502e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 503e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int flexcan_poll_bus_err(struct net_device *dev, u32 reg_esr) 504e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 505e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct sk_buff *skb; 506e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct can_frame *cf; 507e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 508e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde skb = alloc_can_err_skb(dev, &cf); 509e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (unlikely(!skb)) 510e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 511e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 512e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde do_bus_err(dev, cf, reg_esr); 513e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde netif_receive_skb(skb); 514e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 515e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev->stats.rx_packets++; 516e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev->stats.rx_bytes += cf->can_dlc; 517e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 518e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 1; 519e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 520e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 521e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic void do_state(struct net_device *dev, 522e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct can_frame *cf, enum can_state new_state) 523e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 524e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv = netdev_priv(dev); 525e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct can_berr_counter bec; 526e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 527e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flexcan_get_berr_counter(dev, &bec); 528e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 529e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde switch (priv->can.state) { 530e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde case CAN_STATE_ERROR_ACTIVE: 531e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* 532e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * from: ERROR_ACTIVE 533e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * to : ERROR_WARNING, ERROR_PASSIVE, BUS_OFF 534e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * => : there was a warning int 535e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 536e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (new_state >= CAN_STATE_ERROR_WARNING && 537e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde new_state <= CAN_STATE_BUS_OFF) { 538aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "Error Warning IRQ\n"); 539e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->can.can_stats.error_warning++; 540e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 541e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->can_id |= CAN_ERR_CRTL; 542e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->data[1] = (bec.txerr > bec.rxerr) ? 543e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde CAN_ERR_CRTL_TX_WARNING : 544e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde CAN_ERR_CRTL_RX_WARNING; 545e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 546e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde case CAN_STATE_ERROR_WARNING: /* fallthrough */ 547e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* 548e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * from: ERROR_ACTIVE, ERROR_WARNING 549e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * to : ERROR_PASSIVE, BUS_OFF 550e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * => : error passive int 551e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 552e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (new_state >= CAN_STATE_ERROR_PASSIVE && 553e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde new_state <= CAN_STATE_BUS_OFF) { 554aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "Error Passive IRQ\n"); 555e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->can.can_stats.error_passive++; 556e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 557e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->can_id |= CAN_ERR_CRTL; 558e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->data[1] = (bec.txerr > bec.rxerr) ? 559e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde CAN_ERR_CRTL_TX_PASSIVE : 560e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde CAN_ERR_CRTL_RX_PASSIVE; 561e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 562e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde break; 563e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde case CAN_STATE_BUS_OFF: 564aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_err(dev, "BUG! " 565aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger "hardware recovered automatically from BUS_OFF\n"); 566e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde break; 567e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde default: 568e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde break; 569e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 570e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 571e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* process state changes depending on the new state */ 572e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde switch (new_state) { 5738ce261d0bb491da957278cdcba207791f329d1daSebastian Andrzej Siewior case CAN_STATE_ERROR_WARNING: 5748ce261d0bb491da957278cdcba207791f329d1daSebastian Andrzej Siewior netdev_dbg(dev, "Error Warning\n"); 5758ce261d0bb491da957278cdcba207791f329d1daSebastian Andrzej Siewior cf->can_id |= CAN_ERR_CRTL; 5768ce261d0bb491da957278cdcba207791f329d1daSebastian Andrzej Siewior cf->data[1] = (bec.txerr > bec.rxerr) ? 5778ce261d0bb491da957278cdcba207791f329d1daSebastian Andrzej Siewior CAN_ERR_CRTL_TX_WARNING : 5788ce261d0bb491da957278cdcba207791f329d1daSebastian Andrzej Siewior CAN_ERR_CRTL_RX_WARNING; 5798ce261d0bb491da957278cdcba207791f329d1daSebastian Andrzej Siewior break; 580e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde case CAN_STATE_ERROR_ACTIVE: 581aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "Error Active\n"); 582e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->can_id |= CAN_ERR_PROT; 583e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->data[2] = CAN_ERR_PROT_ACTIVE; 584e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde break; 585e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde case CAN_STATE_BUS_OFF: 586e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->can_id |= CAN_ERR_BUSOFF; 587e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde can_bus_off(dev); 588e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde break; 589e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde default: 590e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde break; 591e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 592e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 593e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 594e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int flexcan_poll_state(struct net_device *dev, u32 reg_esr) 595e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 596e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv = netdev_priv(dev); 597e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct sk_buff *skb; 598e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct can_frame *cf; 599e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde enum can_state new_state; 600e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde int flt; 601e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 602e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flt = reg_esr & FLEXCAN_ESR_FLT_CONF_MASK; 603e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (likely(flt == FLEXCAN_ESR_FLT_CONF_ACTIVE)) { 604e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (likely(!(reg_esr & (FLEXCAN_ESR_TX_WRN | 605e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_ESR_RX_WRN)))) 606e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde new_state = CAN_STATE_ERROR_ACTIVE; 607e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde else 608e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde new_state = CAN_STATE_ERROR_WARNING; 609e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } else if (unlikely(flt == FLEXCAN_ESR_FLT_CONF_PASSIVE)) 610e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde new_state = CAN_STATE_ERROR_PASSIVE; 611e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde else 612e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde new_state = CAN_STATE_BUS_OFF; 613e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 614e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* state hasn't changed */ 615e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (likely(new_state == priv->can.state)) 616e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 617e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 618e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde skb = alloc_can_err_skb(dev, &cf); 619e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (unlikely(!skb)) 620e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 621e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 622e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde do_state(dev, cf, new_state); 623e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->can.state = new_state; 624e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde netif_receive_skb(skb); 625e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 626e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev->stats.rx_packets++; 627e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev->stats.rx_bytes += cf->can_dlc; 628e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 629e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 1; 630e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 631e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 632e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic void flexcan_read_fifo(const struct net_device *dev, 633e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct can_frame *cf) 634e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 635e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde const struct flexcan_priv *priv = netdev_priv(dev); 636e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 637e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_mb __iomem *mb = ®s->cantxfg[0]; 638e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg_ctrl, reg_id; 639e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 64061e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg_ctrl = flexcan_read(&mb->can_ctrl); 64161e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg_id = flexcan_read(&mb->can_id); 642e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (reg_ctrl & FLEXCAN_MB_CNT_IDE) 643e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->can_id = ((reg_id >> 0) & CAN_EFF_MASK) | CAN_EFF_FLAG; 644e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde else 645e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->can_id = (reg_id >> 18) & CAN_SFF_MASK; 646e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 647e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (reg_ctrl & FLEXCAN_MB_CNT_RTR) 648e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->can_id |= CAN_RTR_FLAG; 649e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->can_dlc = get_can_dlc((reg_ctrl >> 16) & 0xf); 650e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 65161e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com *(__be32 *)(cf->data + 0) = cpu_to_be32(flexcan_read(&mb->data[0])); 65261e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com *(__be32 *)(cf->data + 4) = cpu_to_be32(flexcan_read(&mb->data[1])); 653e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 654e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* mark as read */ 65561e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(FLEXCAN_IFLAG_RX_FIFO_AVAILABLE, ®s->iflag1); 65661e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_read(®s->timer); 657e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 658e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 659e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int flexcan_read_frame(struct net_device *dev) 660e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 661e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct net_device_stats *stats = &dev->stats; 662e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct can_frame *cf; 663e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct sk_buff *skb; 664e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 665e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde skb = alloc_can_skb(dev, &cf); 666e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (unlikely(!skb)) { 667e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde stats->rx_dropped++; 668e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 669e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 670e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 671e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flexcan_read_fifo(dev, cf); 672e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde netif_receive_skb(skb); 673e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 674e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde stats->rx_packets++; 675e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde stats->rx_bytes += cf->can_dlc; 676e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 677adccadb92f0571fd0f9b2ac8011057a7de9e3e63Fabio Baltieri can_led_event(dev, CAN_LED_EVENT_RX); 678adccadb92f0571fd0f9b2ac8011057a7de9e3e63Fabio Baltieri 679e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 1; 680e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 681e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 682e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int flexcan_poll(struct napi_struct *napi, int quota) 683e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 684e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct net_device *dev = napi->dev; 685e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde const struct flexcan_priv *priv = netdev_priv(dev); 686e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 687e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg_iflag1, reg_esr; 688e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde int work_done = 0; 689e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 690e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* 691e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * The error bits are cleared on read, 692e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * use saved value from irq handler. 693e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 69461e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg_esr = flexcan_read(®s->esr) | priv->reg_esr; 695e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 696e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* handle state changes */ 697e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde work_done += flexcan_poll_state(dev, reg_esr); 698e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 699e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* handle RX-FIFO */ 70061e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg_iflag1 = flexcan_read(®s->iflag1); 701e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde while (reg_iflag1 & FLEXCAN_IFLAG_RX_FIFO_AVAILABLE && 702e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde work_done < quota) { 703e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde work_done += flexcan_read_frame(dev); 70461e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg_iflag1 = flexcan_read(®s->iflag1); 705e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 706e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 707e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* report bus errors */ 708e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (flexcan_has_and_handle_berr(priv, reg_esr) && work_done < quota) 709e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde work_done += flexcan_poll_bus_err(dev, reg_esr); 710e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 711e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (work_done < quota) { 712e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde napi_complete(napi); 713e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* enable IRQs */ 71461e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(FLEXCAN_IFLAG_DEFAULT, ®s->imask1); 71561e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(priv->reg_ctrl_default, ®s->ctrl); 716e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 717e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 718e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return work_done; 719e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 720e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 721e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic irqreturn_t flexcan_irq(int irq, void *dev_id) 722e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 723e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct net_device *dev = dev_id; 724e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct net_device_stats *stats = &dev->stats; 725e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv = netdev_priv(dev); 726e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 727e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg_iflag1, reg_esr; 728e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 72961e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg_iflag1 = flexcan_read(®s->iflag1); 73061e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg_esr = flexcan_read(®s->esr); 7316e9d554fa6e481a848358c215f129432262123c0Wolfgang Grandegger /* ACK all bus error and state change IRQ sources */ 7326e9d554fa6e481a848358c215f129432262123c0Wolfgang Grandegger if (reg_esr & FLEXCAN_ESR_ALL_INT) 7336e9d554fa6e481a848358c215f129432262123c0Wolfgang Grandegger flexcan_write(reg_esr & FLEXCAN_ESR_ALL_INT, ®s->esr); 734e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 735e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* 736e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * schedule NAPI in case of: 737e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * - rx IRQ 738e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * - state change IRQ 739e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * - bus error IRQ and bus error reporting is activated 740e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 741e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if ((reg_iflag1 & FLEXCAN_IFLAG_RX_FIFO_AVAILABLE) || 742e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde (reg_esr & FLEXCAN_ESR_ERR_STATE) || 743e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flexcan_has_and_handle_berr(priv, reg_esr)) { 744e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* 745e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * The error bits are cleared on read, 746e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * save them for later use. 747e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 748e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->reg_esr = reg_esr & FLEXCAN_ESR_ERR_BUS; 74961e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(FLEXCAN_IFLAG_DEFAULT & 75061e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com ~FLEXCAN_IFLAG_RX_FIFO_AVAILABLE, ®s->imask1); 75161e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(priv->reg_ctrl_default & ~FLEXCAN_CTRL_ERR_ALL, 752e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde ®s->ctrl); 753e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde napi_schedule(&priv->napi); 754e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 755e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 756e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* FIFO overflow */ 757e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (reg_iflag1 & FLEXCAN_IFLAG_RX_FIFO_OVERFLOW) { 75861e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(FLEXCAN_IFLAG_RX_FIFO_OVERFLOW, ®s->iflag1); 759e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev->stats.rx_over_errors++; 760e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev->stats.rx_errors++; 761e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 762e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 763e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* transmission complete interrupt */ 764e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (reg_iflag1 & (1 << FLEXCAN_TX_BUF_ID)) { 7659a12349663061d25b49e6542d005fa7193a2cb44Reuben Dowle stats->tx_bytes += can_get_echo_skb(dev, 0); 766e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde stats->tx_packets++; 767adccadb92f0571fd0f9b2ac8011057a7de9e3e63Fabio Baltieri can_led_event(dev, CAN_LED_EVENT_TX); 768de5944883ebbedbf5adc8497659772f5da7b7d72Marc Kleine-Budde /* after sending a RTR frame mailbox is in RX mode */ 769de5944883ebbedbf5adc8497659772f5da7b7d72Marc Kleine-Budde flexcan_write(FLEXCAN_MB_CODE_TX_INACTIVE, 770de5944883ebbedbf5adc8497659772f5da7b7d72Marc Kleine-Budde ®s->cantxfg[FLEXCAN_TX_BUF_ID].can_ctrl); 77161e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write((1 << FLEXCAN_TX_BUF_ID), ®s->iflag1); 772e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde netif_wake_queue(dev); 773e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 774e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 775e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return IRQ_HANDLED; 776e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 777e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 778e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic void flexcan_set_bittiming(struct net_device *dev) 779e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 780e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde const struct flexcan_priv *priv = netdev_priv(dev); 781e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde const struct can_bittiming *bt = &priv->can.bittiming; 782e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 783e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg; 784e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 78561e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg = flexcan_read(®s->ctrl); 786e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg &= ~(FLEXCAN_CTRL_PRESDIV(0xff) | 787e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_RJW(0x3) | 788e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_PSEG1(0x7) | 789e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_PSEG2(0x7) | 790e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_PROPSEG(0x7) | 791e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_LPB | 792e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_SMP | 793e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_LOM); 794e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 795e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg |= FLEXCAN_CTRL_PRESDIV(bt->brp - 1) | 796e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_PSEG1(bt->phase_seg1 - 1) | 797e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_PSEG2(bt->phase_seg2 - 1) | 798e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_RJW(bt->sjw - 1) | 799e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_PROPSEG(bt->prop_seg - 1); 800e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 801e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK) 802e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg |= FLEXCAN_CTRL_LPB; 803e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY) 804e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg |= FLEXCAN_CTRL_LOM; 805e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) 806e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg |= FLEXCAN_CTRL_SMP; 807e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 808aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_info(dev, "writing ctrl=0x%08x\n", reg); 80961e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(reg, ®s->ctrl); 810e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 811e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* print chip status */ 812aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "%s: mcr=0x%08x ctrl=0x%08x\n", __func__, 813aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger flexcan_read(®s->mcr), flexcan_read(®s->ctrl)); 814e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 815e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 816e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* 817e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * flexcan_chip_start 818e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 819e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * this functions is entered with clocks enabled 820e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 821e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 822e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int flexcan_chip_start(struct net_device *dev) 823e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 824e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv = netdev_priv(dev); 825e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 826e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde int err; 827e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg_mcr, reg_ctrl; 828fc05b884a31dbf259cc73cc856e634ec3acbebb6David Jander int i; 829e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 830e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* enable module */ 8319b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde err = flexcan_chip_enable(priv); 8329b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde if (err) 8339b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde return err; 834e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 835e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* soft reset */ 8364b5b82274a17f0ebbf02378df2ba7f36a3f5af19Marc Kleine-Budde err = flexcan_chip_softreset(priv); 8374b5b82274a17f0ebbf02378df2ba7f36a3f5af19Marc Kleine-Budde if (err) 838b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde goto out_chip_disable; 839e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 840e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flexcan_set_bittiming(dev); 841e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 842e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* 843e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * MCR 844e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 845e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * enable freeze 846e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * enable fifo 847e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * halt now 848e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * only supervisor access 849e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * enable warning int 850e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * choose format C 8519a12349663061d25b49e6542d005fa7193a2cb44Reuben Dowle * disable local echo 852e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 853e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 85461e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg_mcr = flexcan_read(®s->mcr); 855d5a7b406c529e4595ce03dc8f6dcf7fa36f106faMarc Kleine-Budde reg_mcr &= ~FLEXCAN_MCR_MAXMB(0xff); 856e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg_mcr |= FLEXCAN_MCR_FRZ | FLEXCAN_MCR_FEN | FLEXCAN_MCR_HALT | 857e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_MCR_SUPV | FLEXCAN_MCR_WRN_EN | 858d5a7b406c529e4595ce03dc8f6dcf7fa36f106faMarc Kleine-Budde FLEXCAN_MCR_IDAM_C | FLEXCAN_MCR_SRX_DIS | 859d5a7b406c529e4595ce03dc8f6dcf7fa36f106faMarc Kleine-Budde FLEXCAN_MCR_MAXMB(FLEXCAN_TX_BUF_ID); 860aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "%s: writing mcr=0x%08x", __func__, reg_mcr); 86161e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(reg_mcr, ®s->mcr); 862e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 863e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* 864e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * CTRL 865e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 866e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * disable timer sync feature 867e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 868e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * disable auto busoff recovery 869e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * transmit lowest buffer first 870e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 871e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * enable tx and rx warning interrupt 872e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * enable bus off interrupt 873e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * (== FLEXCAN_CTRL_ERR_STATE) 874e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 87561e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg_ctrl = flexcan_read(®s->ctrl); 876e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg_ctrl &= ~FLEXCAN_CTRL_TSYN; 877e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg_ctrl |= FLEXCAN_CTRL_BOFF_REC | FLEXCAN_CTRL_LBUF | 8784f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandegger FLEXCAN_CTRL_ERR_STATE; 8794f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandegger /* 8804f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandegger * enable the "error interrupt" (FLEXCAN_CTRL_ERR_MSK), 8814f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandegger * on most Flexcan cores, too. Otherwise we don't get 8824f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandegger * any error warning or passive interrupts. 8834f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandegger */ 8844f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandegger if (priv->devtype_data->features & FLEXCAN_HAS_BROKEN_ERR_STATE || 8854f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandegger priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING) 8864f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandegger reg_ctrl |= FLEXCAN_CTRL_ERR_MSK; 887bc03a54139baafcd8fe89ad115411c2c9c8a4905Alexander Stein else 888bc03a54139baafcd8fe89ad115411c2c9c8a4905Alexander Stein reg_ctrl &= ~FLEXCAN_CTRL_ERR_MSK; 889e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 890e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* save for later use */ 891e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->reg_ctrl_default = reg_ctrl; 892aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "%s: writing ctrl=0x%08x", __func__, reg_ctrl); 89361e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(reg_ctrl, ®s->ctrl); 894e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 895fc05b884a31dbf259cc73cc856e634ec3acbebb6David Jander /* clear and invalidate all mailboxes first */ 896fc05b884a31dbf259cc73cc856e634ec3acbebb6David Jander for (i = FLEXCAN_TX_BUF_ID; i < ARRAY_SIZE(regs->cantxfg); i++) { 897fc05b884a31dbf259cc73cc856e634ec3acbebb6David Jander flexcan_write(FLEXCAN_MB_CODE_RX_INACTIVE, 898fc05b884a31dbf259cc73cc856e634ec3acbebb6David Jander ®s->cantxfg[i].can_ctrl); 899fc05b884a31dbf259cc73cc856e634ec3acbebb6David Jander } 900fc05b884a31dbf259cc73cc856e634ec3acbebb6David Jander 90125e924450fcb23c11c07c95ea8964dd9f174652eDavid Jander /* Errata ERR005829: mark first TX mailbox as INACTIVE */ 90225e924450fcb23c11c07c95ea8964dd9f174652eDavid Jander flexcan_write(FLEXCAN_MB_CODE_TX_INACTIVE, 90325e924450fcb23c11c07c95ea8964dd9f174652eDavid Jander ®s->cantxfg[FLEXCAN_TX_BUF_RESERVED].can_ctrl); 90425e924450fcb23c11c07c95ea8964dd9f174652eDavid Jander 905c32fe4ad3e4861b2bfa1f44114c564935a123ddaMarc Kleine-Budde /* mark TX mailbox as INACTIVE */ 906c32fe4ad3e4861b2bfa1f44114c564935a123ddaMarc Kleine-Budde flexcan_write(FLEXCAN_MB_CODE_TX_INACTIVE, 907d5a7b406c529e4595ce03dc8f6dcf7fa36f106faMarc Kleine-Budde ®s->cantxfg[FLEXCAN_TX_BUF_ID].can_ctrl); 908d5a7b406c529e4595ce03dc8f6dcf7fa36f106faMarc Kleine-Budde 909e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* acceptance mask/acceptance code (accept everything) */ 91061e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(0x0, ®s->rxgmask); 91161e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(0x0, ®s->rx14mask); 91261e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(0x0, ®s->rx15mask); 913e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 9144f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandegger if (priv->devtype_data->features & FLEXCAN_HAS_V10_FEATURES) 91530c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang flexcan_write(0x0, ®s->rxfgmask); 91630c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang 917f003698e23f6f56a791774f14d0ac35d04872490Marc Kleine-Budde err = flexcan_transceiver_enable(priv); 918f003698e23f6f56a791774f14d0ac35d04872490Marc Kleine-Budde if (err) 919b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde goto out_chip_disable; 920e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 921e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* synchronize with the can bus */ 922b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde err = flexcan_chip_unfreeze(priv); 923b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde if (err) 924b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde goto out_transceiver_disable; 925e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 926e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->can.state = CAN_STATE_ERROR_ACTIVE; 927e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 928e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* enable FIFO interrupts */ 92961e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(FLEXCAN_IFLAG_DEFAULT, ®s->imask1); 930e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 931e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* print chip status */ 932aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "%s: reading mcr=0x%08x ctrl=0x%08x\n", __func__, 933aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger flexcan_read(®s->mcr), flexcan_read(®s->ctrl)); 934e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 935e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 936e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 937b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde out_transceiver_disable: 938b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde flexcan_transceiver_disable(priv); 939b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde out_chip_disable: 940e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flexcan_chip_disable(priv); 941e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return err; 942e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 943e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 944e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* 945e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * flexcan_chip_stop 946e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 947e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * this functions is entered with clocks enabled 948e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 949e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 950e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic void flexcan_chip_stop(struct net_device *dev) 951e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 952e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv = netdev_priv(dev); 953e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 954e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 955b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde /* freeze + disable module */ 956b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde flexcan_chip_freeze(priv); 957b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde flexcan_chip_disable(priv); 958e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 9595be93bdda64e85450598c6e97f79fb8f6acf30e0Marc Kleine-Budde /* Disable all interrupts */ 9605be93bdda64e85450598c6e97f79fb8f6acf30e0Marc Kleine-Budde flexcan_write(0, ®s->imask1); 9615be93bdda64e85450598c6e97f79fb8f6acf30e0Marc Kleine-Budde flexcan_write(priv->reg_ctrl_default & ~FLEXCAN_CTRL_ERR_ALL, 9625be93bdda64e85450598c6e97f79fb8f6acf30e0Marc Kleine-Budde ®s->ctrl); 9635be93bdda64e85450598c6e97f79fb8f6acf30e0Marc Kleine-Budde 964f003698e23f6f56a791774f14d0ac35d04872490Marc Kleine-Budde flexcan_transceiver_disable(priv); 965e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->can.state = CAN_STATE_STOPPED; 966e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 967e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return; 968e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 969e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 970e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int flexcan_open(struct net_device *dev) 971e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 972e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv = netdev_priv(dev); 973e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde int err; 974e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 975aa10181bdac99a623517f0f2bfa14cd98c749246Fabio Estevam err = clk_prepare_enable(priv->clk_ipg); 976aa10181bdac99a623517f0f2bfa14cd98c749246Fabio Estevam if (err) 977aa10181bdac99a623517f0f2bfa14cd98c749246Fabio Estevam return err; 978aa10181bdac99a623517f0f2bfa14cd98c749246Fabio Estevam 979aa10181bdac99a623517f0f2bfa14cd98c749246Fabio Estevam err = clk_prepare_enable(priv->clk_per); 980aa10181bdac99a623517f0f2bfa14cd98c749246Fabio Estevam if (err) 981aa10181bdac99a623517f0f2bfa14cd98c749246Fabio Estevam goto out_disable_ipg; 982e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 983e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = open_candev(dev); 984e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (err) 985aa10181bdac99a623517f0f2bfa14cd98c749246Fabio Estevam goto out_disable_per; 986e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 987e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = request_irq(dev->irq, flexcan_irq, IRQF_SHARED, dev->name, dev); 988e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (err) 989e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde goto out_close; 990e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 991e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* start chip and queuing */ 992e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = flexcan_chip_start(dev); 993e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (err) 9947e9e148af01ef388efb6e2490805970be4622792Marc Kleine-Budde goto out_free_irq; 995adccadb92f0571fd0f9b2ac8011057a7de9e3e63Fabio Baltieri 996adccadb92f0571fd0f9b2ac8011057a7de9e3e63Fabio Baltieri can_led_event(dev, CAN_LED_EVENT_OPEN); 997adccadb92f0571fd0f9b2ac8011057a7de9e3e63Fabio Baltieri 998e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde napi_enable(&priv->napi); 999e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde netif_start_queue(dev); 1000e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1001e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 1002e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 10037e9e148af01ef388efb6e2490805970be4622792Marc Kleine-Budde out_free_irq: 10047e9e148af01ef388efb6e2490805970be4622792Marc Kleine-Budde free_irq(dev->irq, dev); 1005e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde out_close: 1006e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde close_candev(dev); 1007aa10181bdac99a623517f0f2bfa14cd98c749246Fabio Estevam out_disable_per: 10083d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar clk_disable_unprepare(priv->clk_per); 1009aa10181bdac99a623517f0f2bfa14cd98c749246Fabio Estevam out_disable_ipg: 10103d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar clk_disable_unprepare(priv->clk_ipg); 1011e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1012e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return err; 1013e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 1014e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1015e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int flexcan_close(struct net_device *dev) 1016e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 1017e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv = netdev_priv(dev); 1018e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1019e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde netif_stop_queue(dev); 1020e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde napi_disable(&priv->napi); 1021e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flexcan_chip_stop(dev); 1022e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1023e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde free_irq(dev->irq, dev); 10243d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar clk_disable_unprepare(priv->clk_per); 10253d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar clk_disable_unprepare(priv->clk_ipg); 1026e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1027e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde close_candev(dev); 1028e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1029adccadb92f0571fd0f9b2ac8011057a7de9e3e63Fabio Baltieri can_led_event(dev, CAN_LED_EVENT_STOP); 1030adccadb92f0571fd0f9b2ac8011057a7de9e3e63Fabio Baltieri 1031e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 1032e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 1033e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1034e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int flexcan_set_mode(struct net_device *dev, enum can_mode mode) 1035e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 1036e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde int err; 1037e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1038e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde switch (mode) { 1039e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde case CAN_MODE_START: 1040e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = flexcan_chip_start(dev); 1041e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (err) 1042e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return err; 1043e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1044e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde netif_wake_queue(dev); 1045e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde break; 1046e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1047e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde default: 1048e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return -EOPNOTSUPP; 1049e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 1050e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1051e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 1052e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 1053e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1054e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic const struct net_device_ops flexcan_netdev_ops = { 1055e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .ndo_open = flexcan_open, 1056e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .ndo_stop = flexcan_close, 1057e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .ndo_start_xmit = flexcan_start_xmit, 1058c971fa2ae42e73e9ccc2f5e93f268c8742da4c5dOliver Hartkopp .ndo_change_mtu = can_change_mtu, 1059e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde}; 1060e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 10613c8ac0f2ad53a96ac58efe7c98fac2986d081dfcBill Pembertonstatic int register_flexcandev(struct net_device *dev) 1062e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 1063e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv = netdev_priv(dev); 1064e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 1065e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg, err; 1066e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1067aa10181bdac99a623517f0f2bfa14cd98c749246Fabio Estevam err = clk_prepare_enable(priv->clk_ipg); 1068aa10181bdac99a623517f0f2bfa14cd98c749246Fabio Estevam if (err) 1069aa10181bdac99a623517f0f2bfa14cd98c749246Fabio Estevam return err; 1070aa10181bdac99a623517f0f2bfa14cd98c749246Fabio Estevam 1071aa10181bdac99a623517f0f2bfa14cd98c749246Fabio Estevam err = clk_prepare_enable(priv->clk_per); 1072aa10181bdac99a623517f0f2bfa14cd98c749246Fabio Estevam if (err) 1073aa10181bdac99a623517f0f2bfa14cd98c749246Fabio Estevam goto out_disable_ipg; 1074e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1075e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* select "bus clock", chip must be disabled */ 10769b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde err = flexcan_chip_disable(priv); 10779b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde if (err) 10789b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde goto out_disable_per; 107961e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg = flexcan_read(®s->ctrl); 1080e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg |= FLEXCAN_CTRL_CLK_SRC; 108161e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(reg, ®s->ctrl); 1082e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 10839b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde err = flexcan_chip_enable(priv); 10849b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde if (err) 10859b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde goto out_chip_disable; 1086e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1087e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* set freeze, halt and activate FIFO, restrict register access */ 108861e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg = flexcan_read(®s->mcr); 1089e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg |= FLEXCAN_MCR_FRZ | FLEXCAN_MCR_HALT | 1090e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_MCR_FEN | FLEXCAN_MCR_SUPV; 109161e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(reg, ®s->mcr); 1092e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1093e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* 1094e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * Currently we only support newer versions of this core 1095e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * featuring a RX FIFO. Older cores found on some Coldfire 1096e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * derivates are not yet supported. 1097e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 109861e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg = flexcan_read(®s->mcr); 1099e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (!(reg & FLEXCAN_MCR_FEN)) { 1100aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_err(dev, "Could not enable RX FIFO, unsupported core\n"); 1101e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = -ENODEV; 11029b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde goto out_chip_disable; 1103e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 1104e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1105e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = register_candev(dev); 1106e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1107e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* disable core and turn off clocks */ 11089b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde out_chip_disable: 1109e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flexcan_chip_disable(priv); 11109b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde out_disable_per: 11113d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar clk_disable_unprepare(priv->clk_per); 1112aa10181bdac99a623517f0f2bfa14cd98c749246Fabio Estevam out_disable_ipg: 11133d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar clk_disable_unprepare(priv->clk_ipg); 1114e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1115e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return err; 1116e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 1117e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 11183c8ac0f2ad53a96ac58efe7c98fac2986d081dfcBill Pembertonstatic void unregister_flexcandev(struct net_device *dev) 1119e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 1120e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde unregister_candev(dev); 1121e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 1122e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 112330c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wangstatic const struct of_device_id flexcan_of_match[] = { 112430c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang { .compatible = "fsl,imx6q-flexcan", .data = &fsl_imx6q_devtype_data, }, 1125e358784297992b012e8071764d996191dd2b1a54Marc Kleine-Budde { .compatible = "fsl,imx28-flexcan", .data = &fsl_imx28_devtype_data, }, 1126e358784297992b012e8071764d996191dd2b1a54Marc Kleine-Budde { .compatible = "fsl,p1010-flexcan", .data = &fsl_p1010_devtype_data, }, 112730c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang { /* sentinel */ }, 112830c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang}; 11294358a9dc94cd70fa88797c87ed911bc8d866f37dMarc Kleine-BuddeMODULE_DEVICE_TABLE(of, flexcan_of_match); 113030c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang 113130c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wangstatic const struct platform_device_id flexcan_id_table[] = { 113230c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang { .name = "flexcan", .driver_data = (kernel_ulong_t)&fsl_p1010_devtype_data, }, 113330c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang { /* sentinel */ }, 113430c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang}; 11354358a9dc94cd70fa88797c87ed911bc8d866f37dMarc Kleine-BuddeMODULE_DEVICE_TABLE(platform, flexcan_id_table); 113630c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang 11373c8ac0f2ad53a96ac58efe7c98fac2986d081dfcBill Pembertonstatic int flexcan_probe(struct platform_device *pdev) 1138e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 113930c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang const struct of_device_id *of_id; 1140dda0b3bd1cbb66ee869d589f7d719f703d7c38a1Marc Kleine-Budde const struct flexcan_devtype_data *devtype_data; 1141e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct net_device *dev; 1142e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv; 1143e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct resource *mem; 11443d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar struct clk *clk_ipg = NULL, *clk_per = NULL; 1145e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde void __iomem *base; 1146e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde int err, irq; 114797efe9aef1ae8922666d32f28d712745a86859e9holt@sgi.com u32 clock_freq = 0; 114897efe9aef1ae8922666d32f28d712745a86859e9holt@sgi.com 1149afc016d8360ceb19a1f37bf6579d5850d47d582dHui Wang if (pdev->dev.of_node) 1150afc016d8360ceb19a1f37bf6579d5850d47d582dHui Wang of_property_read_u32(pdev->dev.of_node, 1151afc016d8360ceb19a1f37bf6579d5850d47d582dHui Wang "clock-frequency", &clock_freq); 115297efe9aef1ae8922666d32f28d712745a86859e9holt@sgi.com 115397efe9aef1ae8922666d32f28d712745a86859e9holt@sgi.com if (!clock_freq) { 11543d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar clk_ipg = devm_clk_get(&pdev->dev, "ipg"); 11553d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar if (IS_ERR(clk_ipg)) { 11563d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar dev_err(&pdev->dev, "no ipg clock defined\n"); 1157933e4af4c590c63509ffadeb77fcd1d329ac9155Fabio Estevam return PTR_ERR(clk_ipg); 11583d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar } 11593d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar 11603d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar clk_per = devm_clk_get(&pdev->dev, "per"); 11613d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar if (IS_ERR(clk_per)) { 11623d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar dev_err(&pdev->dev, "no per clock defined\n"); 1163933e4af4c590c63509ffadeb77fcd1d329ac9155Fabio Estevam return PTR_ERR(clk_per); 116497efe9aef1ae8922666d32f28d712745a86859e9holt@sgi.com } 11651a3e5173f5e72cbf7f0c8927b33082e361c16d72Marc Kleine-Budde clock_freq = clk_get_rate(clk_per); 1166e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 1167e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1168e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1169e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde irq = platform_get_irq(pdev, 0); 1170933e4af4c590c63509ffadeb77fcd1d329ac9155Fabio Estevam if (irq <= 0) 1171933e4af4c590c63509ffadeb77fcd1d329ac9155Fabio Estevam return -ENODEV; 1172e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1173933e4af4c590c63509ffadeb77fcd1d329ac9155Fabio Estevam base = devm_ioremap_resource(&pdev->dev, mem); 1174933e4af4c590c63509ffadeb77fcd1d329ac9155Fabio Estevam if (IS_ERR(base)) 1175933e4af4c590c63509ffadeb77fcd1d329ac9155Fabio Estevam return PTR_ERR(base); 1176e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 117730c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang of_id = of_match_device(flexcan_of_match, &pdev->dev); 117830c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang if (of_id) { 117930c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang devtype_data = of_id->data; 1180d0873e6fc06686cf2dfb9adabb6ca65e9967c60fMarc Kleine-Budde } else if (platform_get_device_id(pdev)->driver_data) { 118130c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang devtype_data = (struct flexcan_devtype_data *) 1182d0873e6fc06686cf2dfb9adabb6ca65e9967c60fMarc Kleine-Budde platform_get_device_id(pdev)->driver_data; 118330c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang } else { 1184933e4af4c590c63509ffadeb77fcd1d329ac9155Fabio Estevam return -ENODEV; 118530c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang } 118630c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang 1187933e4af4c590c63509ffadeb77fcd1d329ac9155Fabio Estevam dev = alloc_candev(sizeof(struct flexcan_priv), 1); 1188933e4af4c590c63509ffadeb77fcd1d329ac9155Fabio Estevam if (!dev) 1189933e4af4c590c63509ffadeb77fcd1d329ac9155Fabio Estevam return -ENOMEM; 1190933e4af4c590c63509ffadeb77fcd1d329ac9155Fabio Estevam 1191e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev->netdev_ops = &flexcan_netdev_ops; 1192e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev->irq = irq; 11939a12349663061d25b49e6542d005fa7193a2cb44Reuben Dowle dev->flags |= IFF_ECHO; 1194e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1195e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv = netdev_priv(dev); 119697efe9aef1ae8922666d32f28d712745a86859e9holt@sgi.com priv->can.clock.freq = clock_freq; 1197e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->can.bittiming_const = &flexcan_bittiming_const; 1198e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->can.do_set_mode = flexcan_set_mode; 1199e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->can.do_get_berr_counter = flexcan_get_berr_counter; 1200e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK | 1201e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde CAN_CTRLMODE_LISTENONLY | CAN_CTRLMODE_3_SAMPLES | 1202e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde CAN_CTRLMODE_BERR_REPORTING; 1203e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->base = base; 1204e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->dev = dev; 12053d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar priv->clk_ipg = clk_ipg; 12063d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar priv->clk_per = clk_per; 120784ae6643d8bd2d6c9a4e313212bfe68e0abcab3fJingoo Han priv->pdata = dev_get_platdata(&pdev->dev); 120830c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang priv->devtype_data = devtype_data; 1209e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1210b7c4114b07bbacfe0aee1d04ad1ade9e42309620Fabio Estevam priv->reg_xceiver = devm_regulator_get(&pdev->dev, "xceiver"); 1211b7c4114b07bbacfe0aee1d04ad1ade9e42309620Fabio Estevam if (IS_ERR(priv->reg_xceiver)) 1212b7c4114b07bbacfe0aee1d04ad1ade9e42309620Fabio Estevam priv->reg_xceiver = NULL; 1213b7c4114b07bbacfe0aee1d04ad1ade9e42309620Fabio Estevam 1214e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde netif_napi_add(dev, &priv->napi, flexcan_poll, FLEXCAN_NAPI_WEIGHT); 1215e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1216d75ea942b360690a380da8012a51eaf6a6ebb1b1Libo Chen platform_set_drvdata(pdev, dev); 1217e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde SET_NETDEV_DEV(dev, &pdev->dev); 1218e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1219e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = register_flexcandev(dev); 1220e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (err) { 1221e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev_err(&pdev->dev, "registering netdev failed\n"); 1222e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde goto failed_register; 1223e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 1224e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1225adccadb92f0571fd0f9b2ac8011057a7de9e3e63Fabio Baltieri devm_can_led_init(dev); 1226adccadb92f0571fd0f9b2ac8011057a7de9e3e63Fabio Baltieri 1227e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev_info(&pdev->dev, "device registered (reg_base=%p, irq=%d)\n", 1228e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->base, dev->irq); 1229e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1230e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 1231e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1232e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde failed_register: 1233e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde free_candev(dev); 1234e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return err; 1235e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 1236e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 12373c8ac0f2ad53a96ac58efe7c98fac2986d081dfcBill Pembertonstatic int flexcan_remove(struct platform_device *pdev) 1238e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 1239e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct net_device *dev = platform_get_drvdata(pdev); 1240d96e43e8fce28cf97df576a07af9d65657a41a6fMarc Kleine-Budde struct flexcan_priv *priv = netdev_priv(dev); 1241e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1242e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde unregister_flexcandev(dev); 1243d96e43e8fce28cf97df576a07af9d65657a41a6fMarc Kleine-Budde netif_napi_del(&priv->napi); 12449a27586d3d5c3157260b055d057c6f4f6654c72cMarc Kleine-Budde free_candev(dev); 12459a27586d3d5c3157260b055d057c6f4f6654c72cMarc Kleine-Budde 1246e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 1247e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 1248e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 124908c6d35154069becb01243176fb72b3bc60ff3cbMarc Kleine-Buddestatic int __maybe_unused flexcan_suspend(struct device *device) 12508b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard{ 1251588e7a8e123da07b6ffe87f156e25afc1c3d7cceFabio Estevam struct net_device *dev = dev_get_drvdata(device); 12528b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard struct flexcan_priv *priv = netdev_priv(dev); 12539b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde int err; 12548b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard 12559b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde err = flexcan_chip_disable(priv); 12569b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde if (err) 12579b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde return err; 12588b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard 12598b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard if (netif_running(dev)) { 12608b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard netif_stop_queue(dev); 12618b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard netif_device_detach(dev); 12628b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard } 12638b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard priv->can.state = CAN_STATE_SLEEPING; 12648b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard 12658b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard return 0; 12668b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard} 12678b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard 126808c6d35154069becb01243176fb72b3bc60ff3cbMarc Kleine-Buddestatic int __maybe_unused flexcan_resume(struct device *device) 12698b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard{ 1270588e7a8e123da07b6ffe87f156e25afc1c3d7cceFabio Estevam struct net_device *dev = dev_get_drvdata(device); 12718b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard struct flexcan_priv *priv = netdev_priv(dev); 12728b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard 12738b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard priv->can.state = CAN_STATE_ERROR_ACTIVE; 12748b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard if (netif_running(dev)) { 12758b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard netif_device_attach(dev); 12768b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard netif_start_queue(dev); 12778b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard } 12789b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde return flexcan_chip_enable(priv); 12798b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard} 1280588e7a8e123da07b6ffe87f156e25afc1c3d7cceFabio Estevam 1281588e7a8e123da07b6ffe87f156e25afc1c3d7cceFabio Estevamstatic SIMPLE_DEV_PM_OPS(flexcan_pm_ops, flexcan_suspend, flexcan_resume); 12828b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard 1283e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic struct platform_driver flexcan_driver = { 1284c8aef4cb788b760331e6df06a5d93389824882b4holt@sgi.com .driver = { 1285c8aef4cb788b760331e6df06a5d93389824882b4holt@sgi.com .name = DRV_NAME, 1286c8aef4cb788b760331e6df06a5d93389824882b4holt@sgi.com .owner = THIS_MODULE, 1287588e7a8e123da07b6ffe87f156e25afc1c3d7cceFabio Estevam .pm = &flexcan_pm_ops, 1288c8aef4cb788b760331e6df06a5d93389824882b4holt@sgi.com .of_match_table = flexcan_of_match, 1289c8aef4cb788b760331e6df06a5d93389824882b4holt@sgi.com }, 1290e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .probe = flexcan_probe, 12913c8ac0f2ad53a96ac58efe7c98fac2986d081dfcBill Pemberton .remove = flexcan_remove, 129230c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang .id_table = flexcan_id_table, 1293e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde}; 1294e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1295871d33725545ca2e402b4526f38f89d041ba930fAxel Linmodule_platform_driver(flexcan_driver); 1296e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1297e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-BuddeMODULE_AUTHOR("Sascha Hauer <kernel@pengutronix.de>, " 1298e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde "Marc Kleine-Budde <kernel@pengutronix.de>"); 1299e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-BuddeMODULE_LICENSE("GPL v2"); 1300e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-BuddeMODULE_DESCRIPTION("CAN port driver for flexcan based chip"); 1301