flexcan.c revision adccadb92f0571fd0f9b2ac8011057a7de9e3e63
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/can/platform/flexcan.h> 28e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#include <linux/clk.h> 29e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#include <linux/delay.h> 30e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#include <linux/if_arp.h> 31e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#include <linux/if_ether.h> 32e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#include <linux/interrupt.h> 33e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#include <linux/io.h> 34e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#include <linux/kernel.h> 35e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#include <linux/list.h> 36e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#include <linux/module.h> 3797efe9aef1ae8922666d32f28d712745a86859e9holt@sgi.com#include <linux/of.h> 3830c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang#include <linux/of_device.h> 39e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#include <linux/platform_device.h> 40a53157c21c699c392921e243fa96abc27722f910Shawn Guo#include <linux/pinctrl/consumer.h> 41e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 42e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define DRV_NAME "flexcan" 43e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 44e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* 8 for RX fifo and 2 error handling */ 45e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_NAPI_WEIGHT (8 + 2) 46e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 47e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* FLEXCAN module configuration register (CANMCR) bits */ 48e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_MDIS BIT(31) 49e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_FRZ BIT(30) 50e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_FEN BIT(29) 51e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_HALT BIT(28) 52e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_NOT_RDY BIT(27) 53e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_WAK_MSK BIT(26) 54e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_SOFTRST BIT(25) 55e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_FRZ_ACK BIT(24) 56e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_SUPV BIT(23) 57e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_SLF_WAK BIT(22) 58e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_WRN_EN BIT(21) 59e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_LPM_ACK BIT(20) 60e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_WAK_SRC BIT(19) 61e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_DOZE BIT(18) 62e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_SRX_DIS BIT(17) 63e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_BCC BIT(16) 64e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_LPRIO_EN BIT(13) 65e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_AEN BIT(12) 66e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_MAXMB(x) ((x) & 0xf) 67e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_IDAM_A (0 << 8) 68e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_IDAM_B (1 << 8) 69e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_IDAM_C (2 << 8) 70e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_IDAM_D (3 << 8) 71e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 72e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* FLEXCAN control register (CANCTRL) bits */ 73e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_PRESDIV(x) (((x) & 0xff) << 24) 74e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_RJW(x) (((x) & 0x03) << 22) 75e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_PSEG1(x) (((x) & 0x07) << 19) 76e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_PSEG2(x) (((x) & 0x07) << 16) 77e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_BOFF_MSK BIT(15) 78e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_ERR_MSK BIT(14) 79e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_CLK_SRC BIT(13) 80e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_LPB BIT(12) 81e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_TWRN_MSK BIT(11) 82e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_RWRN_MSK BIT(10) 83e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_SMP BIT(7) 84e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_BOFF_REC BIT(6) 85e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_TSYN BIT(5) 86e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_LBUF BIT(4) 87e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_LOM BIT(3) 88e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_PROPSEG(x) ((x) & 0x07) 89e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_ERR_BUS (FLEXCAN_CTRL_ERR_MSK) 90e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_ERR_STATE \ 91e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde (FLEXCAN_CTRL_TWRN_MSK | FLEXCAN_CTRL_RWRN_MSK | \ 92e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_BOFF_MSK) 93e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_ERR_ALL \ 94e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde (FLEXCAN_CTRL_ERR_BUS | FLEXCAN_CTRL_ERR_STATE) 95e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 96e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* FLEXCAN error and status register (ESR) bits */ 97e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_TWRN_INT BIT(17) 98e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_RWRN_INT BIT(16) 99e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_BIT1_ERR BIT(15) 100e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_BIT0_ERR BIT(14) 101e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_ACK_ERR BIT(13) 102e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_CRC_ERR BIT(12) 103e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_FRM_ERR BIT(11) 104e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_STF_ERR BIT(10) 105e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_TX_WRN BIT(9) 106e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_RX_WRN BIT(8) 107e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_IDLE BIT(7) 108e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_TXRX BIT(6) 109e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_EST_FLT_CONF_SHIFT (4) 110e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_FLT_CONF_MASK (0x3 << FLEXCAN_EST_FLT_CONF_SHIFT) 111e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_FLT_CONF_ACTIVE (0x0 << FLEXCAN_EST_FLT_CONF_SHIFT) 112e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_FLT_CONF_PASSIVE (0x1 << FLEXCAN_EST_FLT_CONF_SHIFT) 113e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_BOFF_INT BIT(2) 114e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_ERR_INT BIT(1) 115e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_WAK_INT BIT(0) 116e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_ERR_BUS \ 117e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde (FLEXCAN_ESR_BIT1_ERR | FLEXCAN_ESR_BIT0_ERR | \ 118e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_ESR_ACK_ERR | FLEXCAN_ESR_CRC_ERR | \ 119e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_ESR_FRM_ERR | FLEXCAN_ESR_STF_ERR) 120e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_ERR_STATE \ 121e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde (FLEXCAN_ESR_TWRN_INT | FLEXCAN_ESR_RWRN_INT | FLEXCAN_ESR_BOFF_INT) 122e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_ERR_ALL \ 123e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde (FLEXCAN_ESR_ERR_BUS | FLEXCAN_ESR_ERR_STATE) 1246e9d554fa6e481a848358c215f129432262123c0Wolfgang Grandegger#define FLEXCAN_ESR_ALL_INT \ 1256e9d554fa6e481a848358c215f129432262123c0Wolfgang Grandegger (FLEXCAN_ESR_TWRN_INT | FLEXCAN_ESR_RWRN_INT | \ 1266e9d554fa6e481a848358c215f129432262123c0Wolfgang Grandegger FLEXCAN_ESR_BOFF_INT | FLEXCAN_ESR_ERR_INT) 127e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 128e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* FLEXCAN interrupt flag register (IFLAG) bits */ 129e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_TX_BUF_ID 8 130e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_IFLAG_BUF(x) BIT(x) 131e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_IFLAG_RX_FIFO_OVERFLOW BIT(7) 132e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_IFLAG_RX_FIFO_WARN BIT(6) 133e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_IFLAG_RX_FIFO_AVAILABLE BIT(5) 134e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_IFLAG_DEFAULT \ 135e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde (FLEXCAN_IFLAG_RX_FIFO_OVERFLOW | FLEXCAN_IFLAG_RX_FIFO_AVAILABLE | \ 136e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_IFLAG_BUF(FLEXCAN_TX_BUF_ID)) 137e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 138e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* FLEXCAN message buffers */ 139e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MB_CNT_CODE(x) (((x) & 0xf) << 24) 140e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MB_CNT_SRR BIT(22) 141e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MB_CNT_IDE BIT(21) 142e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MB_CNT_RTR BIT(20) 143e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MB_CNT_LENGTH(x) (((x) & 0xf) << 16) 144e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MB_CNT_TIMESTAMP(x) ((x) & 0xffff) 145e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 146e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MB_CODE_MASK (0xf0ffffff) 147e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 148bb698ca41ba574b3066ebbc5766e5980ae0051caWolfgang Grandegger/* 149bb698ca41ba574b3066ebbc5766e5980ae0051caWolfgang Grandegger * FLEXCAN hardware feature flags 150bb698ca41ba574b3066ebbc5766e5980ae0051caWolfgang Grandegger * 151bb698ca41ba574b3066ebbc5766e5980ae0051caWolfgang Grandegger * Below is some version info we got: 152bb698ca41ba574b3066ebbc5766e5980ae0051caWolfgang Grandegger * SOC Version IP-Version Glitch- [TR]WRN_INT 153bb698ca41ba574b3066ebbc5766e5980ae0051caWolfgang Grandegger * Filter? connected? 154bb698ca41ba574b3066ebbc5766e5980ae0051caWolfgang Grandegger * MX25 FlexCAN2 03.00.00.00 no no 155bb698ca41ba574b3066ebbc5766e5980ae0051caWolfgang Grandegger * MX28 FlexCAN2 03.00.04.00 yes yes 156bb698ca41ba574b3066ebbc5766e5980ae0051caWolfgang Grandegger * MX35 FlexCAN2 03.00.00.00 no no 157bb698ca41ba574b3066ebbc5766e5980ae0051caWolfgang Grandegger * MX53 FlexCAN2 03.00.00.00 yes no 158bb698ca41ba574b3066ebbc5766e5980ae0051caWolfgang Grandegger * MX6s FlexCAN3 10.00.12.00 yes yes 159bb698ca41ba574b3066ebbc5766e5980ae0051caWolfgang Grandegger * 160bb698ca41ba574b3066ebbc5766e5980ae0051caWolfgang Grandegger * Some SOCs do not have the RX_WARN & TX_WARN interrupt line connected. 161bb698ca41ba574b3066ebbc5766e5980ae0051caWolfgang Grandegger */ 1624f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandegger#define FLEXCAN_HAS_V10_FEATURES BIT(1) /* For core version >= 10 */ 163bb698ca41ba574b3066ebbc5766e5980ae0051caWolfgang Grandegger#define FLEXCAN_HAS_BROKEN_ERR_STATE BIT(2) /* [TR]WRN_INT not connected */ 1644f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandegger 165e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* Structure of the message buffer */ 166e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestruct flexcan_mb { 167e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 can_ctrl; 168e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 can_id; 169e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 data[2]; 170e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde}; 171e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 172e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* Structure of the hardware registers */ 173e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestruct flexcan_regs { 174e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 mcr; /* 0x00 */ 175e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 ctrl; /* 0x04 */ 176e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 timer; /* 0x08 */ 177e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 _reserved1; /* 0x0c */ 178e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 rxgmask; /* 0x10 */ 179e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 rx14mask; /* 0x14 */ 180e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 rx15mask; /* 0x18 */ 181e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 ecr; /* 0x1c */ 182e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 esr; /* 0x20 */ 183e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 imask2; /* 0x24 */ 184e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 imask1; /* 0x28 */ 185e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 iflag2; /* 0x2c */ 186e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 iflag1; /* 0x30 */ 18730c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang u32 crl2; /* 0x34 */ 18830c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang u32 esr2; /* 0x38 */ 18930c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang u32 imeur; /* 0x3c */ 19030c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang u32 lrfr; /* 0x40 */ 19130c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang u32 crcr; /* 0x44 */ 19230c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang u32 rxfgmask; /* 0x48 */ 19330c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang u32 rxfir; /* 0x4c */ 19430c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang u32 _reserved3[12]; 195e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_mb cantxfg[64]; 196e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde}; 197e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 19830c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wangstruct flexcan_devtype_data { 1994f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandegger u32 features; /* hardware controller features */ 20030c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang}; 20130c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang 202e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestruct flexcan_priv { 203e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct can_priv can; 204e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct net_device *dev; 205e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct napi_struct napi; 206e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 207e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde void __iomem *base; 208e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg_esr; 209e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg_ctrl_default; 210e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 2113d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar struct clk *clk_ipg; 2123d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar struct clk *clk_per; 213e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_platform_data *pdata; 214dda0b3bd1cbb66ee869d589f7d719f703d7c38a1Marc Kleine-Budde const struct flexcan_devtype_data *devtype_data; 21530c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang}; 21630c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang 21730c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wangstatic struct flexcan_devtype_data fsl_p1010_devtype_data = { 2184f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandegger .features = FLEXCAN_HAS_BROKEN_ERR_STATE, 21930c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang}; 2204f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandeggerstatic struct flexcan_devtype_data fsl_imx28_devtype_data; 22130c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wangstatic struct flexcan_devtype_data fsl_imx6q_devtype_data = { 222bb698ca41ba574b3066ebbc5766e5980ae0051caWolfgang Grandegger .features = FLEXCAN_HAS_V10_FEATURES, 223e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde}; 224e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 225194b9a4cb91713ddb60c9f98f7212f6d8cb8e05fMarc Kleine-Buddestatic const struct can_bittiming_const flexcan_bittiming_const = { 226e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .name = DRV_NAME, 227e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .tseg1_min = 4, 228e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .tseg1_max = 16, 229e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .tseg2_min = 2, 230e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .tseg2_max = 8, 231e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .sjw_max = 4, 232e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .brp_min = 1, 233e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .brp_max = 256, 234e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .brp_inc = 1, 235e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde}; 236e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 237e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* 23861e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com * Abstract off the read/write for arm versus ppc. 23961e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com */ 24061e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com#if defined(__BIG_ENDIAN) 24161e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.comstatic inline u32 flexcan_read(void __iomem *addr) 24261e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com{ 24361e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com return in_be32(addr); 24461e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com} 24561e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com 24661e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.comstatic inline void flexcan_write(u32 val, void __iomem *addr) 24761e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com{ 24861e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com out_be32(addr, val); 24961e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com} 25061e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com#else 25161e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.comstatic inline u32 flexcan_read(void __iomem *addr) 25261e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com{ 25361e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com return readl(addr); 25461e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com} 25561e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com 25661e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.comstatic inline void flexcan_write(u32 val, void __iomem *addr) 25761e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com{ 25861e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com writel(val, addr); 25961e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com} 26061e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com#endif 26161e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com 26261e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com/* 263e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * Swtich transceiver on or off 264e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 265e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic void flexcan_transceiver_switch(const struct flexcan_priv *priv, int on) 266e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 267e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (priv->pdata && priv->pdata->transceiver_switch) 268e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->pdata->transceiver_switch(on); 269e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 270e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 271e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic inline int flexcan_has_and_handle_berr(const struct flexcan_priv *priv, 272e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg_esr) 273e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 274e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING) && 275e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde (reg_esr & FLEXCAN_ESR_ERR_BUS); 276e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 277e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 278e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic inline void flexcan_chip_enable(struct flexcan_priv *priv) 279e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 280e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 281e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg; 282e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 28361e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg = flexcan_read(®s->mcr); 284e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg &= ~FLEXCAN_MCR_MDIS; 28561e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(reg, ®s->mcr); 286e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 287e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde udelay(10); 288e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 289e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 290e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic inline void flexcan_chip_disable(struct flexcan_priv *priv) 291e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 292e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 293e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg; 294e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 29561e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg = flexcan_read(®s->mcr); 296e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg |= FLEXCAN_MCR_MDIS; 29761e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(reg, ®s->mcr); 298e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 299e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 300e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int flexcan_get_berr_counter(const struct net_device *dev, 301e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct can_berr_counter *bec) 302e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 303e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde const struct flexcan_priv *priv = netdev_priv(dev); 304e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 30561e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com u32 reg = flexcan_read(®s->ecr); 306e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 307e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde bec->txerr = (reg >> 0) & 0xff; 308e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde bec->rxerr = (reg >> 8) & 0xff; 309e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 310e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 311e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 312e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 313e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int flexcan_start_xmit(struct sk_buff *skb, struct net_device *dev) 314e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 315e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde const struct flexcan_priv *priv = netdev_priv(dev); 316e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 317e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct can_frame *cf = (struct can_frame *)skb->data; 318e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 can_id; 319e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 ctrl = FLEXCAN_MB_CNT_CODE(0xc) | (cf->can_dlc << 16); 320e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 321e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (can_dropped_invalid_skb(dev, skb)) 322e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return NETDEV_TX_OK; 323e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 324e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde netif_stop_queue(dev); 325e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 326e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (cf->can_id & CAN_EFF_FLAG) { 327e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde can_id = cf->can_id & CAN_EFF_MASK; 328e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde ctrl |= FLEXCAN_MB_CNT_IDE | FLEXCAN_MB_CNT_SRR; 329e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } else { 330e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde can_id = (cf->can_id & CAN_SFF_MASK) << 18; 331e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 332e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 333e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (cf->can_id & CAN_RTR_FLAG) 334e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde ctrl |= FLEXCAN_MB_CNT_RTR; 335e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 336e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (cf->can_dlc > 0) { 337e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 data = be32_to_cpup((__be32 *)&cf->data[0]); 33861e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(data, ®s->cantxfg[FLEXCAN_TX_BUF_ID].data[0]); 339e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 340e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (cf->can_dlc > 3) { 341e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 data = be32_to_cpup((__be32 *)&cf->data[4]); 34261e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(data, ®s->cantxfg[FLEXCAN_TX_BUF_ID].data[1]); 343e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 344e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 3459a12349663061d25b49e6542d005fa7193a2cb44Reuben Dowle can_put_echo_skb(skb, dev, 0); 3469a12349663061d25b49e6542d005fa7193a2cb44Reuben Dowle 34761e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(can_id, ®s->cantxfg[FLEXCAN_TX_BUF_ID].can_id); 34861e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(ctrl, ®s->cantxfg[FLEXCAN_TX_BUF_ID].can_ctrl); 349e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 350e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return NETDEV_TX_OK; 351e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 352e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 353e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic void do_bus_err(struct net_device *dev, 354e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct can_frame *cf, u32 reg_esr) 355e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 356e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv = netdev_priv(dev); 357e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde int rx_errors = 0, tx_errors = 0; 358e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 359e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR; 360e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 361e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (reg_esr & FLEXCAN_ESR_BIT1_ERR) { 362aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "BIT1_ERR irq\n"); 363e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->data[2] |= CAN_ERR_PROT_BIT1; 364e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde tx_errors = 1; 365e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 366e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (reg_esr & FLEXCAN_ESR_BIT0_ERR) { 367aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "BIT0_ERR irq\n"); 368e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->data[2] |= CAN_ERR_PROT_BIT0; 369e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde tx_errors = 1; 370e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 371e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (reg_esr & FLEXCAN_ESR_ACK_ERR) { 372aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "ACK_ERR irq\n"); 373e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->can_id |= CAN_ERR_ACK; 374e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->data[3] |= CAN_ERR_PROT_LOC_ACK; 375e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde tx_errors = 1; 376e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 377e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (reg_esr & FLEXCAN_ESR_CRC_ERR) { 378aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "CRC_ERR irq\n"); 379e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->data[2] |= CAN_ERR_PROT_BIT; 380e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->data[3] |= CAN_ERR_PROT_LOC_CRC_SEQ; 381e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde rx_errors = 1; 382e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 383e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (reg_esr & FLEXCAN_ESR_FRM_ERR) { 384aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "FRM_ERR irq\n"); 385e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->data[2] |= CAN_ERR_PROT_FORM; 386e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde rx_errors = 1; 387e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 388e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (reg_esr & FLEXCAN_ESR_STF_ERR) { 389aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "STF_ERR irq\n"); 390e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->data[2] |= CAN_ERR_PROT_STUFF; 391e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde rx_errors = 1; 392e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 393e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 394e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->can.can_stats.bus_error++; 395e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (rx_errors) 396e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev->stats.rx_errors++; 397e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (tx_errors) 398e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev->stats.tx_errors++; 399e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 400e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 401e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int flexcan_poll_bus_err(struct net_device *dev, u32 reg_esr) 402e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 403e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct sk_buff *skb; 404e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct can_frame *cf; 405e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 406e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde skb = alloc_can_err_skb(dev, &cf); 407e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (unlikely(!skb)) 408e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 409e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 410e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde do_bus_err(dev, cf, reg_esr); 411e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde netif_receive_skb(skb); 412e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 413e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev->stats.rx_packets++; 414e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev->stats.rx_bytes += cf->can_dlc; 415e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 416e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 1; 417e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 418e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 419e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic void do_state(struct net_device *dev, 420e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct can_frame *cf, enum can_state new_state) 421e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 422e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv = netdev_priv(dev); 423e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct can_berr_counter bec; 424e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 425e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flexcan_get_berr_counter(dev, &bec); 426e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 427e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde switch (priv->can.state) { 428e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde case CAN_STATE_ERROR_ACTIVE: 429e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* 430e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * from: ERROR_ACTIVE 431e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * to : ERROR_WARNING, ERROR_PASSIVE, BUS_OFF 432e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * => : there was a warning int 433e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 434e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (new_state >= CAN_STATE_ERROR_WARNING && 435e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde new_state <= CAN_STATE_BUS_OFF) { 436aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "Error Warning IRQ\n"); 437e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->can.can_stats.error_warning++; 438e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 439e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->can_id |= CAN_ERR_CRTL; 440e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->data[1] = (bec.txerr > bec.rxerr) ? 441e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde CAN_ERR_CRTL_TX_WARNING : 442e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde CAN_ERR_CRTL_RX_WARNING; 443e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 444e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde case CAN_STATE_ERROR_WARNING: /* fallthrough */ 445e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* 446e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * from: ERROR_ACTIVE, ERROR_WARNING 447e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * to : ERROR_PASSIVE, BUS_OFF 448e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * => : error passive int 449e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 450e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (new_state >= CAN_STATE_ERROR_PASSIVE && 451e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde new_state <= CAN_STATE_BUS_OFF) { 452aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "Error Passive IRQ\n"); 453e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->can.can_stats.error_passive++; 454e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 455e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->can_id |= CAN_ERR_CRTL; 456e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->data[1] = (bec.txerr > bec.rxerr) ? 457e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde CAN_ERR_CRTL_TX_PASSIVE : 458e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde CAN_ERR_CRTL_RX_PASSIVE; 459e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 460e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde break; 461e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde case CAN_STATE_BUS_OFF: 462aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_err(dev, "BUG! " 463aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger "hardware recovered automatically from BUS_OFF\n"); 464e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde break; 465e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde default: 466e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde break; 467e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 468e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 469e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* process state changes depending on the new state */ 470e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde switch (new_state) { 471e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde case CAN_STATE_ERROR_ACTIVE: 472aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "Error Active\n"); 473e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->can_id |= CAN_ERR_PROT; 474e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->data[2] = CAN_ERR_PROT_ACTIVE; 475e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde break; 476e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde case CAN_STATE_BUS_OFF: 477e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->can_id |= CAN_ERR_BUSOFF; 478e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde can_bus_off(dev); 479e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde break; 480e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde default: 481e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde break; 482e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 483e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 484e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 485e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int flexcan_poll_state(struct net_device *dev, u32 reg_esr) 486e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 487e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv = netdev_priv(dev); 488e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct sk_buff *skb; 489e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct can_frame *cf; 490e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde enum can_state new_state; 491e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde int flt; 492e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 493e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flt = reg_esr & FLEXCAN_ESR_FLT_CONF_MASK; 494e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (likely(flt == FLEXCAN_ESR_FLT_CONF_ACTIVE)) { 495e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (likely(!(reg_esr & (FLEXCAN_ESR_TX_WRN | 496e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_ESR_RX_WRN)))) 497e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde new_state = CAN_STATE_ERROR_ACTIVE; 498e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde else 499e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde new_state = CAN_STATE_ERROR_WARNING; 500e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } else if (unlikely(flt == FLEXCAN_ESR_FLT_CONF_PASSIVE)) 501e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde new_state = CAN_STATE_ERROR_PASSIVE; 502e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde else 503e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde new_state = CAN_STATE_BUS_OFF; 504e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 505e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* state hasn't changed */ 506e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (likely(new_state == priv->can.state)) 507e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 508e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 509e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde skb = alloc_can_err_skb(dev, &cf); 510e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (unlikely(!skb)) 511e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 512e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 513e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde do_state(dev, cf, new_state); 514e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->can.state = new_state; 515e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde netif_receive_skb(skb); 516e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 517e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev->stats.rx_packets++; 518e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev->stats.rx_bytes += cf->can_dlc; 519e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 520e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 1; 521e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 522e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 523e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic void flexcan_read_fifo(const struct net_device *dev, 524e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct can_frame *cf) 525e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 526e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde const struct flexcan_priv *priv = netdev_priv(dev); 527e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 528e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_mb __iomem *mb = ®s->cantxfg[0]; 529e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg_ctrl, reg_id; 530e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 53161e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg_ctrl = flexcan_read(&mb->can_ctrl); 53261e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg_id = flexcan_read(&mb->can_id); 533e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (reg_ctrl & FLEXCAN_MB_CNT_IDE) 534e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->can_id = ((reg_id >> 0) & CAN_EFF_MASK) | CAN_EFF_FLAG; 535e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde else 536e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->can_id = (reg_id >> 18) & CAN_SFF_MASK; 537e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 538e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (reg_ctrl & FLEXCAN_MB_CNT_RTR) 539e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->can_id |= CAN_RTR_FLAG; 540e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->can_dlc = get_can_dlc((reg_ctrl >> 16) & 0xf); 541e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 54261e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com *(__be32 *)(cf->data + 0) = cpu_to_be32(flexcan_read(&mb->data[0])); 54361e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com *(__be32 *)(cf->data + 4) = cpu_to_be32(flexcan_read(&mb->data[1])); 544e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 545e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* mark as read */ 54661e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(FLEXCAN_IFLAG_RX_FIFO_AVAILABLE, ®s->iflag1); 54761e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_read(®s->timer); 548e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 549e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 550e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int flexcan_read_frame(struct net_device *dev) 551e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 552e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct net_device_stats *stats = &dev->stats; 553e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct can_frame *cf; 554e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct sk_buff *skb; 555e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 556e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde skb = alloc_can_skb(dev, &cf); 557e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (unlikely(!skb)) { 558e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde stats->rx_dropped++; 559e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 560e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 561e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 562e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flexcan_read_fifo(dev, cf); 563e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde netif_receive_skb(skb); 564e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 565e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde stats->rx_packets++; 566e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde stats->rx_bytes += cf->can_dlc; 567e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 568adccadb92f0571fd0f9b2ac8011057a7de9e3e63Fabio Baltieri can_led_event(dev, CAN_LED_EVENT_RX); 569adccadb92f0571fd0f9b2ac8011057a7de9e3e63Fabio Baltieri 570e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 1; 571e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 572e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 573e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int flexcan_poll(struct napi_struct *napi, int quota) 574e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 575e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct net_device *dev = napi->dev; 576e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde const struct flexcan_priv *priv = netdev_priv(dev); 577e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 578e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg_iflag1, reg_esr; 579e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde int work_done = 0; 580e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 581e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* 582e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * The error bits are cleared on read, 583e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * use saved value from irq handler. 584e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 58561e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg_esr = flexcan_read(®s->esr) | priv->reg_esr; 586e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 587e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* handle state changes */ 588e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde work_done += flexcan_poll_state(dev, reg_esr); 589e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 590e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* handle RX-FIFO */ 59161e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg_iflag1 = flexcan_read(®s->iflag1); 592e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde while (reg_iflag1 & FLEXCAN_IFLAG_RX_FIFO_AVAILABLE && 593e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde work_done < quota) { 594e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde work_done += flexcan_read_frame(dev); 59561e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg_iflag1 = flexcan_read(®s->iflag1); 596e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 597e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 598e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* report bus errors */ 599e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (flexcan_has_and_handle_berr(priv, reg_esr) && work_done < quota) 600e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde work_done += flexcan_poll_bus_err(dev, reg_esr); 601e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 602e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (work_done < quota) { 603e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde napi_complete(napi); 604e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* enable IRQs */ 60561e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(FLEXCAN_IFLAG_DEFAULT, ®s->imask1); 60661e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(priv->reg_ctrl_default, ®s->ctrl); 607e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 608e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 609e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return work_done; 610e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 611e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 612e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic irqreturn_t flexcan_irq(int irq, void *dev_id) 613e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 614e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct net_device *dev = dev_id; 615e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct net_device_stats *stats = &dev->stats; 616e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv = netdev_priv(dev); 617e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 618e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg_iflag1, reg_esr; 619e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 62061e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg_iflag1 = flexcan_read(®s->iflag1); 62161e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg_esr = flexcan_read(®s->esr); 6226e9d554fa6e481a848358c215f129432262123c0Wolfgang Grandegger /* ACK all bus error and state change IRQ sources */ 6236e9d554fa6e481a848358c215f129432262123c0Wolfgang Grandegger if (reg_esr & FLEXCAN_ESR_ALL_INT) 6246e9d554fa6e481a848358c215f129432262123c0Wolfgang Grandegger flexcan_write(reg_esr & FLEXCAN_ESR_ALL_INT, ®s->esr); 625e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 626e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* 627e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * schedule NAPI in case of: 628e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * - rx IRQ 629e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * - state change IRQ 630e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * - bus error IRQ and bus error reporting is activated 631e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 632e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if ((reg_iflag1 & FLEXCAN_IFLAG_RX_FIFO_AVAILABLE) || 633e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde (reg_esr & FLEXCAN_ESR_ERR_STATE) || 634e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flexcan_has_and_handle_berr(priv, reg_esr)) { 635e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* 636e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * The error bits are cleared on read, 637e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * save them for later use. 638e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 639e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->reg_esr = reg_esr & FLEXCAN_ESR_ERR_BUS; 64061e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(FLEXCAN_IFLAG_DEFAULT & 64161e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com ~FLEXCAN_IFLAG_RX_FIFO_AVAILABLE, ®s->imask1); 64261e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(priv->reg_ctrl_default & ~FLEXCAN_CTRL_ERR_ALL, 643e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde ®s->ctrl); 644e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde napi_schedule(&priv->napi); 645e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 646e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 647e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* FIFO overflow */ 648e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (reg_iflag1 & FLEXCAN_IFLAG_RX_FIFO_OVERFLOW) { 64961e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(FLEXCAN_IFLAG_RX_FIFO_OVERFLOW, ®s->iflag1); 650e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev->stats.rx_over_errors++; 651e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev->stats.rx_errors++; 652e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 653e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 654e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* transmission complete interrupt */ 655e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (reg_iflag1 & (1 << FLEXCAN_TX_BUF_ID)) { 6569a12349663061d25b49e6542d005fa7193a2cb44Reuben Dowle stats->tx_bytes += can_get_echo_skb(dev, 0); 657e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde stats->tx_packets++; 658adccadb92f0571fd0f9b2ac8011057a7de9e3e63Fabio Baltieri can_led_event(dev, CAN_LED_EVENT_TX); 65961e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write((1 << FLEXCAN_TX_BUF_ID), ®s->iflag1); 660e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde netif_wake_queue(dev); 661e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 662e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 663e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return IRQ_HANDLED; 664e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 665e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 666e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic void flexcan_set_bittiming(struct net_device *dev) 667e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 668e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde const struct flexcan_priv *priv = netdev_priv(dev); 669e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde const struct can_bittiming *bt = &priv->can.bittiming; 670e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 671e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg; 672e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 67361e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg = flexcan_read(®s->ctrl); 674e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg &= ~(FLEXCAN_CTRL_PRESDIV(0xff) | 675e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_RJW(0x3) | 676e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_PSEG1(0x7) | 677e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_PSEG2(0x7) | 678e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_PROPSEG(0x7) | 679e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_LPB | 680e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_SMP | 681e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_LOM); 682e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 683e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg |= FLEXCAN_CTRL_PRESDIV(bt->brp - 1) | 684e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_PSEG1(bt->phase_seg1 - 1) | 685e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_PSEG2(bt->phase_seg2 - 1) | 686e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_RJW(bt->sjw - 1) | 687e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_PROPSEG(bt->prop_seg - 1); 688e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 689e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK) 690e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg |= FLEXCAN_CTRL_LPB; 691e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY) 692e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg |= FLEXCAN_CTRL_LOM; 693e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) 694e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg |= FLEXCAN_CTRL_SMP; 695e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 696aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_info(dev, "writing ctrl=0x%08x\n", reg); 69761e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(reg, ®s->ctrl); 698e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 699e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* print chip status */ 700aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "%s: mcr=0x%08x ctrl=0x%08x\n", __func__, 701aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger flexcan_read(®s->mcr), flexcan_read(®s->ctrl)); 702e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 703e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 704e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* 705e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * flexcan_chip_start 706e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 707e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * this functions is entered with clocks enabled 708e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 709e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 710e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int flexcan_chip_start(struct net_device *dev) 711e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 712e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv = netdev_priv(dev); 713e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 714e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde unsigned int i; 715e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde int err; 716e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg_mcr, reg_ctrl; 717e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 718e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* enable module */ 719e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flexcan_chip_enable(priv); 720e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 721e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* soft reset */ 72261e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(FLEXCAN_MCR_SOFTRST, ®s->mcr); 723e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde udelay(10); 724e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 72561e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg_mcr = flexcan_read(®s->mcr); 726e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (reg_mcr & FLEXCAN_MCR_SOFTRST) { 727aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_err(dev, "Failed to softreset can module (mcr=0x%08x)\n", 728aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger reg_mcr); 729e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = -ENODEV; 730e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde goto out; 731e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 732e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 733e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flexcan_set_bittiming(dev); 734e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 735e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* 736e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * MCR 737e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 738e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * enable freeze 739e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * enable fifo 740e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * halt now 741e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * only supervisor access 742e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * enable warning int 743e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * choose format C 7449a12349663061d25b49e6542d005fa7193a2cb44Reuben Dowle * disable local echo 745e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 746e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 74761e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg_mcr = flexcan_read(®s->mcr); 748e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg_mcr |= FLEXCAN_MCR_FRZ | FLEXCAN_MCR_FEN | FLEXCAN_MCR_HALT | 749e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_MCR_SUPV | FLEXCAN_MCR_WRN_EN | 7509a12349663061d25b49e6542d005fa7193a2cb44Reuben Dowle FLEXCAN_MCR_IDAM_C | FLEXCAN_MCR_SRX_DIS; 751aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "%s: writing mcr=0x%08x", __func__, reg_mcr); 75261e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(reg_mcr, ®s->mcr); 753e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 754e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* 755e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * CTRL 756e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 757e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * disable timer sync feature 758e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 759e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * disable auto busoff recovery 760e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * transmit lowest buffer first 761e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 762e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * enable tx and rx warning interrupt 763e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * enable bus off interrupt 764e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * (== FLEXCAN_CTRL_ERR_STATE) 765e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 76661e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg_ctrl = flexcan_read(®s->ctrl); 767e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg_ctrl &= ~FLEXCAN_CTRL_TSYN; 768e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg_ctrl |= FLEXCAN_CTRL_BOFF_REC | FLEXCAN_CTRL_LBUF | 7694f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandegger FLEXCAN_CTRL_ERR_STATE; 7704f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandegger /* 7714f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandegger * enable the "error interrupt" (FLEXCAN_CTRL_ERR_MSK), 7724f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandegger * on most Flexcan cores, too. Otherwise we don't get 7734f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandegger * any error warning or passive interrupts. 7744f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandegger */ 7754f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandegger if (priv->devtype_data->features & FLEXCAN_HAS_BROKEN_ERR_STATE || 7764f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandegger priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING) 7774f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandegger reg_ctrl |= FLEXCAN_CTRL_ERR_MSK; 778e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 779e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* save for later use */ 780e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->reg_ctrl_default = reg_ctrl; 781aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "%s: writing ctrl=0x%08x", __func__, reg_ctrl); 78261e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(reg_ctrl, ®s->ctrl); 783e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 784e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde for (i = 0; i < ARRAY_SIZE(regs->cantxfg); i++) { 78561e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(0, ®s->cantxfg[i].can_ctrl); 78661e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(0, ®s->cantxfg[i].can_id); 78761e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(0, ®s->cantxfg[i].data[0]); 78861e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(0, ®s->cantxfg[i].data[1]); 789e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 790e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* put MB into rx queue */ 79161e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(FLEXCAN_MB_CNT_CODE(0x4), 79261e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com ®s->cantxfg[i].can_ctrl); 793e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 794e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 795e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* acceptance mask/acceptance code (accept everything) */ 79661e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(0x0, ®s->rxgmask); 79761e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(0x0, ®s->rx14mask); 79861e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(0x0, ®s->rx15mask); 799e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 8004f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandegger if (priv->devtype_data->features & FLEXCAN_HAS_V10_FEATURES) 80130c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang flexcan_write(0x0, ®s->rxfgmask); 80230c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang 803e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flexcan_transceiver_switch(priv, 1); 804e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 805e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* synchronize with the can bus */ 80661e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg_mcr = flexcan_read(®s->mcr); 807e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg_mcr &= ~FLEXCAN_MCR_HALT; 80861e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(reg_mcr, ®s->mcr); 809e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 810e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->can.state = CAN_STATE_ERROR_ACTIVE; 811e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 812e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* enable FIFO interrupts */ 81361e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(FLEXCAN_IFLAG_DEFAULT, ®s->imask1); 814e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 815e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* print chip status */ 816aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "%s: reading mcr=0x%08x ctrl=0x%08x\n", __func__, 817aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger flexcan_read(®s->mcr), flexcan_read(®s->ctrl)); 818e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 819e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 820e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 821e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde out: 822e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flexcan_chip_disable(priv); 823e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return err; 824e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 825e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 826e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* 827e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * flexcan_chip_stop 828e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 829e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * this functions is entered with clocks enabled 830e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 831e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 832e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic void flexcan_chip_stop(struct net_device *dev) 833e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 834e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv = netdev_priv(dev); 835e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 836e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg; 837e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 838e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* Disable all interrupts */ 83961e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(0, ®s->imask1); 840e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 841e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* Disable + halt module */ 84261e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg = flexcan_read(®s->mcr); 843e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg |= FLEXCAN_MCR_MDIS | FLEXCAN_MCR_HALT; 84461e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(reg, ®s->mcr); 845e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 846e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flexcan_transceiver_switch(priv, 0); 847e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->can.state = CAN_STATE_STOPPED; 848e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 849e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return; 850e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 851e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 852e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int flexcan_open(struct net_device *dev) 853e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 854e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv = netdev_priv(dev); 855e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde int err; 856e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 8573d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar clk_prepare_enable(priv->clk_ipg); 8583d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar clk_prepare_enable(priv->clk_per); 859e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 860e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = open_candev(dev); 861e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (err) 862e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde goto out; 863e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 864e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = request_irq(dev->irq, flexcan_irq, IRQF_SHARED, dev->name, dev); 865e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (err) 866e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde goto out_close; 867e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 868e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* start chip and queuing */ 869e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = flexcan_chip_start(dev); 870e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (err) 871e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde goto out_close; 872adccadb92f0571fd0f9b2ac8011057a7de9e3e63Fabio Baltieri 873adccadb92f0571fd0f9b2ac8011057a7de9e3e63Fabio Baltieri can_led_event(dev, CAN_LED_EVENT_OPEN); 874adccadb92f0571fd0f9b2ac8011057a7de9e3e63Fabio Baltieri 875e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde napi_enable(&priv->napi); 876e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde netif_start_queue(dev); 877e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 878e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 879e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 880e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde out_close: 881e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde close_candev(dev); 882e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde out: 8833d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar clk_disable_unprepare(priv->clk_per); 8843d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar clk_disable_unprepare(priv->clk_ipg); 885e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 886e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return err; 887e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 888e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 889e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int flexcan_close(struct net_device *dev) 890e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 891e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv = netdev_priv(dev); 892e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 893e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde netif_stop_queue(dev); 894e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde napi_disable(&priv->napi); 895e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flexcan_chip_stop(dev); 896e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 897e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde free_irq(dev->irq, dev); 8983d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar clk_disable_unprepare(priv->clk_per); 8993d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar clk_disable_unprepare(priv->clk_ipg); 900e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 901e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde close_candev(dev); 902e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 903adccadb92f0571fd0f9b2ac8011057a7de9e3e63Fabio Baltieri can_led_event(dev, CAN_LED_EVENT_STOP); 904adccadb92f0571fd0f9b2ac8011057a7de9e3e63Fabio Baltieri 905e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 906e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 907e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 908e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int flexcan_set_mode(struct net_device *dev, enum can_mode mode) 909e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 910e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde int err; 911e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 912e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde switch (mode) { 913e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde case CAN_MODE_START: 914e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = flexcan_chip_start(dev); 915e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (err) 916e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return err; 917e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 918e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde netif_wake_queue(dev); 919e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde break; 920e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 921e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde default: 922e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return -EOPNOTSUPP; 923e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 924e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 925e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 926e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 927e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 928e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic const struct net_device_ops flexcan_netdev_ops = { 929e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .ndo_open = flexcan_open, 930e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .ndo_stop = flexcan_close, 931e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .ndo_start_xmit = flexcan_start_xmit, 932e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde}; 933e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 9343c8ac0f2ad53a96ac58efe7c98fac2986d081dfcBill Pembertonstatic int register_flexcandev(struct net_device *dev) 935e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 936e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv = netdev_priv(dev); 937e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 938e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg, err; 939e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 9403d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar clk_prepare_enable(priv->clk_ipg); 9413d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar clk_prepare_enable(priv->clk_per); 942e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 943e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* select "bus clock", chip must be disabled */ 944e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flexcan_chip_disable(priv); 94561e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg = flexcan_read(®s->ctrl); 946e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg |= FLEXCAN_CTRL_CLK_SRC; 94761e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(reg, ®s->ctrl); 948e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 949e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flexcan_chip_enable(priv); 950e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 951e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* set freeze, halt and activate FIFO, restrict register access */ 95261e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg = flexcan_read(®s->mcr); 953e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg |= FLEXCAN_MCR_FRZ | FLEXCAN_MCR_HALT | 954e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_MCR_FEN | FLEXCAN_MCR_SUPV; 95561e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(reg, ®s->mcr); 956e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 957e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* 958e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * Currently we only support newer versions of this core 959e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * featuring a RX FIFO. Older cores found on some Coldfire 960e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * derivates are not yet supported. 961e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 96261e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg = flexcan_read(®s->mcr); 963e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (!(reg & FLEXCAN_MCR_FEN)) { 964aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_err(dev, "Could not enable RX FIFO, unsupported core\n"); 965e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = -ENODEV; 966e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde goto out; 967e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 968e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 969e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = register_candev(dev); 970e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 971e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde out: 972e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* disable core and turn off clocks */ 973e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flexcan_chip_disable(priv); 9743d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar clk_disable_unprepare(priv->clk_per); 9753d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar clk_disable_unprepare(priv->clk_ipg); 976e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 977e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return err; 978e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 979e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 9803c8ac0f2ad53a96ac58efe7c98fac2986d081dfcBill Pembertonstatic void unregister_flexcandev(struct net_device *dev) 981e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 982e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde unregister_candev(dev); 983e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 984e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 98530c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wangstatic const struct of_device_id flexcan_of_match[] = { 98630c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang { .compatible = "fsl,p1010-flexcan", .data = &fsl_p1010_devtype_data, }, 9874f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandegger { .compatible = "fsl,imx28-flexcan", .data = &fsl_imx28_devtype_data, }, 98830c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang { .compatible = "fsl,imx6q-flexcan", .data = &fsl_imx6q_devtype_data, }, 98930c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang { /* sentinel */ }, 99030c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang}; 9914358a9dc94cd70fa88797c87ed911bc8d866f37dMarc Kleine-BuddeMODULE_DEVICE_TABLE(of, flexcan_of_match); 99230c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang 99330c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wangstatic const struct platform_device_id flexcan_id_table[] = { 99430c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang { .name = "flexcan", .driver_data = (kernel_ulong_t)&fsl_p1010_devtype_data, }, 99530c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang { /* sentinel */ }, 99630c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang}; 9974358a9dc94cd70fa88797c87ed911bc8d866f37dMarc Kleine-BuddeMODULE_DEVICE_TABLE(platform, flexcan_id_table); 99830c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang 9993c8ac0f2ad53a96ac58efe7c98fac2986d081dfcBill Pembertonstatic int flexcan_probe(struct platform_device *pdev) 1000e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 100130c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang const struct of_device_id *of_id; 1002dda0b3bd1cbb66ee869d589f7d719f703d7c38a1Marc Kleine-Budde const struct flexcan_devtype_data *devtype_data; 1003e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct net_device *dev; 1004e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv; 1005e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct resource *mem; 10063d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar struct clk *clk_ipg = NULL, *clk_per = NULL; 1007a53157c21c699c392921e243fa96abc27722f910Shawn Guo struct pinctrl *pinctrl; 1008e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde void __iomem *base; 1009e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde resource_size_t mem_size; 1010e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde int err, irq; 101197efe9aef1ae8922666d32f28d712745a86859e9holt@sgi.com u32 clock_freq = 0; 101297efe9aef1ae8922666d32f28d712745a86859e9holt@sgi.com 1013a53157c21c699c392921e243fa96abc27722f910Shawn Guo pinctrl = devm_pinctrl_get_select_default(&pdev->dev); 1014a53157c21c699c392921e243fa96abc27722f910Shawn Guo if (IS_ERR(pinctrl)) 1015a53157c21c699c392921e243fa96abc27722f910Shawn Guo return PTR_ERR(pinctrl); 1016a53157c21c699c392921e243fa96abc27722f910Shawn Guo 1017afc016d8360ceb19a1f37bf6579d5850d47d582dHui Wang if (pdev->dev.of_node) 1018afc016d8360ceb19a1f37bf6579d5850d47d582dHui Wang of_property_read_u32(pdev->dev.of_node, 1019afc016d8360ceb19a1f37bf6579d5850d47d582dHui Wang "clock-frequency", &clock_freq); 102097efe9aef1ae8922666d32f28d712745a86859e9holt@sgi.com 102197efe9aef1ae8922666d32f28d712745a86859e9holt@sgi.com if (!clock_freq) { 10223d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar clk_ipg = devm_clk_get(&pdev->dev, "ipg"); 10233d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar if (IS_ERR(clk_ipg)) { 10243d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar dev_err(&pdev->dev, "no ipg clock defined\n"); 10253d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar err = PTR_ERR(clk_ipg); 10263d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar goto failed_clock; 10273d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar } 10283d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar clock_freq = clk_get_rate(clk_ipg); 10293d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar 10303d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar clk_per = devm_clk_get(&pdev->dev, "per"); 10313d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar if (IS_ERR(clk_per)) { 10323d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar dev_err(&pdev->dev, "no per clock defined\n"); 10333d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar err = PTR_ERR(clk_per); 103497efe9aef1ae8922666d32f28d712745a86859e9holt@sgi.com goto failed_clock; 103597efe9aef1ae8922666d32f28d712745a86859e9holt@sgi.com } 1036e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 1037e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1038e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1039e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde irq = platform_get_irq(pdev, 0); 1040e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (!mem || irq <= 0) { 1041e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = -ENODEV; 1042e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde goto failed_get; 1043e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 1044e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1045e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde mem_size = resource_size(mem); 1046e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (!request_mem_region(mem->start, mem_size, pdev->name)) { 1047e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = -EBUSY; 10482e4ceec4edaef6e903422792de4f7f37de98cec6Julia Lawall goto failed_get; 1049e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 1050e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1051e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde base = ioremap(mem->start, mem_size); 1052e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (!base) { 1053e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = -ENOMEM; 1054e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde goto failed_map; 1055e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 1056e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 10579a12349663061d25b49e6542d005fa7193a2cb44Reuben Dowle dev = alloc_candev(sizeof(struct flexcan_priv), 1); 1058e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (!dev) { 1059e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = -ENOMEM; 1060e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde goto failed_alloc; 1061e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 1062e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 106330c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang of_id = of_match_device(flexcan_of_match, &pdev->dev); 106430c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang if (of_id) { 106530c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang devtype_data = of_id->data; 106630c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang } else if (pdev->id_entry->driver_data) { 106730c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang devtype_data = (struct flexcan_devtype_data *) 106830c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang pdev->id_entry->driver_data; 106930c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang } else { 107030c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang err = -ENODEV; 107130c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang goto failed_devtype; 107230c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang } 107330c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang 1074e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev->netdev_ops = &flexcan_netdev_ops; 1075e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev->irq = irq; 10769a12349663061d25b49e6542d005fa7193a2cb44Reuben Dowle dev->flags |= IFF_ECHO; 1077e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1078e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv = netdev_priv(dev); 107997efe9aef1ae8922666d32f28d712745a86859e9holt@sgi.com priv->can.clock.freq = clock_freq; 1080e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->can.bittiming_const = &flexcan_bittiming_const; 1081e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->can.do_set_mode = flexcan_set_mode; 1082e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->can.do_get_berr_counter = flexcan_get_berr_counter; 1083e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK | 1084e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde CAN_CTRLMODE_LISTENONLY | CAN_CTRLMODE_3_SAMPLES | 1085e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde CAN_CTRLMODE_BERR_REPORTING; 1086e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->base = base; 1087e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->dev = dev; 10883d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar priv->clk_ipg = clk_ipg; 10893d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar priv->clk_per = clk_per; 1090e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->pdata = pdev->dev.platform_data; 109130c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang priv->devtype_data = devtype_data; 1092e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1093e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde netif_napi_add(dev, &priv->napi, flexcan_poll, FLEXCAN_NAPI_WEIGHT); 1094e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1095e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev_set_drvdata(&pdev->dev, dev); 1096e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde SET_NETDEV_DEV(dev, &pdev->dev); 1097e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1098e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = register_flexcandev(dev); 1099e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (err) { 1100e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev_err(&pdev->dev, "registering netdev failed\n"); 1101e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde goto failed_register; 1102e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 1103e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1104adccadb92f0571fd0f9b2ac8011057a7de9e3e63Fabio Baltieri devm_can_led_init(dev); 1105adccadb92f0571fd0f9b2ac8011057a7de9e3e63Fabio Baltieri 1106e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev_info(&pdev->dev, "device registered (reg_base=%p, irq=%d)\n", 1107e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->base, dev->irq); 1108e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1109e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 1110e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1111e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde failed_register: 111230c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang failed_devtype: 1113e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde free_candev(dev); 1114e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde failed_alloc: 1115e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde iounmap(base); 1116e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde failed_map: 1117e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde release_mem_region(mem->start, mem_size); 1118e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde failed_get: 1119e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde failed_clock: 1120e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return err; 1121e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 1122e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 11233c8ac0f2ad53a96ac58efe7c98fac2986d081dfcBill Pembertonstatic int flexcan_remove(struct platform_device *pdev) 1124e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 1125e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct net_device *dev = platform_get_drvdata(pdev); 1126e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv = netdev_priv(dev); 1127e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct resource *mem; 1128e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1129e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde unregister_flexcandev(dev); 1130e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde platform_set_drvdata(pdev, NULL); 1131e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde iounmap(priv->base); 1132e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1133e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1134e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde release_mem_region(mem->start, resource_size(mem)); 1135e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 11369a27586d3d5c3157260b055d057c6f4f6654c72cMarc Kleine-Budde free_candev(dev); 11379a27586d3d5c3157260b055d057c6f4f6654c72cMarc Kleine-Budde 1138e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 1139e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 1140e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 11418b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard#ifdef CONFIG_PM 11428b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénardstatic int flexcan_suspend(struct platform_device *pdev, pm_message_t state) 11438b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard{ 11448b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard struct net_device *dev = platform_get_drvdata(pdev); 11458b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard struct flexcan_priv *priv = netdev_priv(dev); 11468b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard 11478b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard flexcan_chip_disable(priv); 11488b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard 11498b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard if (netif_running(dev)) { 11508b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard netif_stop_queue(dev); 11518b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard netif_device_detach(dev); 11528b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard } 11538b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard priv->can.state = CAN_STATE_SLEEPING; 11548b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard 11558b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard return 0; 11568b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard} 11578b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard 11588b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénardstatic int flexcan_resume(struct platform_device *pdev) 11598b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard{ 11608b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard struct net_device *dev = platform_get_drvdata(pdev); 11618b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard struct flexcan_priv *priv = netdev_priv(dev); 11628b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard 11638b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard priv->can.state = CAN_STATE_ERROR_ACTIVE; 11648b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard if (netif_running(dev)) { 11658b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard netif_device_attach(dev); 11668b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard netif_start_queue(dev); 11678b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard } 11688b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard flexcan_chip_enable(priv); 11698b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard 11708b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard return 0; 11718b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard} 11728b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard#else 11738b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard#define flexcan_suspend NULL 11748b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard#define flexcan_resume NULL 11758b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard#endif 11768b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard 1177e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic struct platform_driver flexcan_driver = { 1178c8aef4cb788b760331e6df06a5d93389824882b4holt@sgi.com .driver = { 1179c8aef4cb788b760331e6df06a5d93389824882b4holt@sgi.com .name = DRV_NAME, 1180c8aef4cb788b760331e6df06a5d93389824882b4holt@sgi.com .owner = THIS_MODULE, 1181c8aef4cb788b760331e6df06a5d93389824882b4holt@sgi.com .of_match_table = flexcan_of_match, 1182c8aef4cb788b760331e6df06a5d93389824882b4holt@sgi.com }, 1183e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .probe = flexcan_probe, 11843c8ac0f2ad53a96ac58efe7c98fac2986d081dfcBill Pemberton .remove = flexcan_remove, 11858b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard .suspend = flexcan_suspend, 11868b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard .resume = flexcan_resume, 118730c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang .id_table = flexcan_id_table, 1188e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde}; 1189e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1190871d33725545ca2e402b4526f38f89d041ba930fAxel Linmodule_platform_driver(flexcan_driver); 1191e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1192e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-BuddeMODULE_AUTHOR("Sascha Hauer <kernel@pengutronix.de>, " 1193e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde "Marc Kleine-Budde <kernel@pengutronix.de>"); 1194e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-BuddeMODULE_LICENSE("GPL v2"); 1195e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-BuddeMODULE_DESCRIPTION("CAN port driver for flexcan based chip"); 1196