1e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* 2e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * flexcan.c - FLEXCAN CAN controller driver 3e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 4e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * Copyright (c) 2005-2006 Varma Electronics Oy 5e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * Copyright (c) 2009 Sascha Hauer, Pengutronix 6e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * Copyright (c) 2010 Marc Kleine-Budde, Pengutronix 7e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 8e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * Based on code originally by Andrey Volkov <avolkov@varma-el.com> 9e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 10e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * LICENCE: 11e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * This program is free software; you can redistribute it and/or 12e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * modify it under the terms of the GNU General Public License as 13e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * published by the Free Software Foundation version 2. 14e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 15e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * This program is distributed in the hope that it will be useful, 16e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * but WITHOUT ANY WARRANTY; without even the implied warranty of 17e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * GNU General Public License for more details. 19e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 20e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 21e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 22e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#include <linux/netdevice.h> 23e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#include <linux/can.h> 24e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#include <linux/can/dev.h> 25e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#include <linux/can/error.h> 26adccadb92f0571fd0f9b2ac8011057a7de9e3e63Fabio Baltieri#include <linux/can/led.h> 27e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#include <linux/clk.h> 28e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#include <linux/delay.h> 29e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#include <linux/if_arp.h> 30e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#include <linux/if_ether.h> 31e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#include <linux/interrupt.h> 32e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#include <linux/io.h> 33e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#include <linux/kernel.h> 34e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#include <linux/list.h> 35e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#include <linux/module.h> 3697efe9aef1ae8922666d32f28d712745a86859e9holt@sgi.com#include <linux/of.h> 3730c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang#include <linux/of_device.h> 38e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#include <linux/platform_device.h> 39b7c4114b07bbacfe0aee1d04ad1ade9e42309620Fabio Estevam#include <linux/regulator/consumer.h> 40e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 41e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define DRV_NAME "flexcan" 42e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 43e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* 8 for RX fifo and 2 error handling */ 44e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_NAPI_WEIGHT (8 + 2) 45e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 46e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* FLEXCAN module configuration register (CANMCR) bits */ 47e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_MDIS BIT(31) 48e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_FRZ BIT(30) 49e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_FEN BIT(29) 50e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_HALT BIT(28) 51e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_NOT_RDY BIT(27) 52e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_WAK_MSK BIT(26) 53e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_SOFTRST BIT(25) 54e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_FRZ_ACK BIT(24) 55e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_SUPV BIT(23) 56e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_SLF_WAK BIT(22) 57e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_WRN_EN BIT(21) 58e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_LPM_ACK BIT(20) 59e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_WAK_SRC BIT(19) 60e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_DOZE BIT(18) 61e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_SRX_DIS BIT(17) 62e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_BCC BIT(16) 63e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_LPRIO_EN BIT(13) 64e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_AEN BIT(12) 654c728d804c4b9d1ae7f76e8f32c419bc21a6e540Marc Kleine-Budde#define FLEXCAN_MCR_MAXMB(x) ((x) & 0x7f) 66e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_IDAM_A (0 << 8) 67e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_IDAM_B (1 << 8) 68e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_IDAM_C (2 << 8) 69e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MCR_IDAM_D (3 << 8) 70e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 71e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* FLEXCAN control register (CANCTRL) bits */ 72e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_PRESDIV(x) (((x) & 0xff) << 24) 73e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_RJW(x) (((x) & 0x03) << 22) 74e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_PSEG1(x) (((x) & 0x07) << 19) 75e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_PSEG2(x) (((x) & 0x07) << 16) 76e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_BOFF_MSK BIT(15) 77e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_ERR_MSK BIT(14) 78e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_CLK_SRC BIT(13) 79e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_LPB BIT(12) 80e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_TWRN_MSK BIT(11) 81e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_RWRN_MSK BIT(10) 82e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_SMP BIT(7) 83e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_BOFF_REC BIT(6) 84e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_TSYN BIT(5) 85e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_LBUF BIT(4) 86e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_LOM BIT(3) 87e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_PROPSEG(x) ((x) & 0x07) 88e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_ERR_BUS (FLEXCAN_CTRL_ERR_MSK) 89e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_ERR_STATE \ 90e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde (FLEXCAN_CTRL_TWRN_MSK | FLEXCAN_CTRL_RWRN_MSK | \ 91e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_BOFF_MSK) 92e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_CTRL_ERR_ALL \ 93e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde (FLEXCAN_CTRL_ERR_BUS | FLEXCAN_CTRL_ERR_STATE) 94e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 95cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner/* FLEXCAN control register 2 (CTRL2) bits */ 96cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner#define FLEXCAN_CRL2_ECRWRE BIT(29) 97cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner#define FLEXCAN_CRL2_WRMFRZ BIT(28) 98cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner#define FLEXCAN_CRL2_RFFN(x) (((x) & 0x0f) << 24) 99cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner#define FLEXCAN_CRL2_TASD(x) (((x) & 0x1f) << 19) 100cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner#define FLEXCAN_CRL2_MRP BIT(18) 101cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner#define FLEXCAN_CRL2_RRS BIT(17) 102cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner#define FLEXCAN_CRL2_EACEN BIT(16) 103cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner 104cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner/* FLEXCAN memory error control register (MECR) bits */ 105cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner#define FLEXCAN_MECR_ECRWRDIS BIT(31) 106cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner#define FLEXCAN_MECR_HANCEI_MSK BIT(19) 107cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner#define FLEXCAN_MECR_FANCEI_MSK BIT(18) 108cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner#define FLEXCAN_MECR_CEI_MSK BIT(16) 109cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner#define FLEXCAN_MECR_HAERRIE BIT(15) 110cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner#define FLEXCAN_MECR_FAERRIE BIT(14) 111cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner#define FLEXCAN_MECR_EXTERRIE BIT(13) 112cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner#define FLEXCAN_MECR_RERRDIS BIT(9) 113cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner#define FLEXCAN_MECR_ECCDIS BIT(8) 114cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner#define FLEXCAN_MECR_NCEFAFRZ BIT(7) 115cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner 116e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* FLEXCAN error and status register (ESR) bits */ 117e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_TWRN_INT BIT(17) 118e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_RWRN_INT BIT(16) 119e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_BIT1_ERR BIT(15) 120e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_BIT0_ERR BIT(14) 121e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_ACK_ERR BIT(13) 122e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_CRC_ERR BIT(12) 123e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_FRM_ERR BIT(11) 124e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_STF_ERR BIT(10) 125e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_TX_WRN BIT(9) 126e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_RX_WRN BIT(8) 127e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_IDLE BIT(7) 128e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_TXRX BIT(6) 129e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_EST_FLT_CONF_SHIFT (4) 130e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_FLT_CONF_MASK (0x3 << FLEXCAN_EST_FLT_CONF_SHIFT) 131e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_FLT_CONF_ACTIVE (0x0 << FLEXCAN_EST_FLT_CONF_SHIFT) 132e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_FLT_CONF_PASSIVE (0x1 << FLEXCAN_EST_FLT_CONF_SHIFT) 133e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_BOFF_INT BIT(2) 134e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_ERR_INT BIT(1) 135e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_WAK_INT BIT(0) 136e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_ERR_BUS \ 137e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde (FLEXCAN_ESR_BIT1_ERR | FLEXCAN_ESR_BIT0_ERR | \ 138e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_ESR_ACK_ERR | FLEXCAN_ESR_CRC_ERR | \ 139e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_ESR_FRM_ERR | FLEXCAN_ESR_STF_ERR) 140e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_ERR_STATE \ 141e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde (FLEXCAN_ESR_TWRN_INT | FLEXCAN_ESR_RWRN_INT | FLEXCAN_ESR_BOFF_INT) 142e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_ESR_ERR_ALL \ 143e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde (FLEXCAN_ESR_ERR_BUS | FLEXCAN_ESR_ERR_STATE) 1446e9d554fa6e481a848358c215f129432262123c0Wolfgang Grandegger#define FLEXCAN_ESR_ALL_INT \ 1456e9d554fa6e481a848358c215f129432262123c0Wolfgang Grandegger (FLEXCAN_ESR_TWRN_INT | FLEXCAN_ESR_RWRN_INT | \ 1466e9d554fa6e481a848358c215f129432262123c0Wolfgang Grandegger FLEXCAN_ESR_BOFF_INT | FLEXCAN_ESR_ERR_INT) 147e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 148e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* FLEXCAN interrupt flag register (IFLAG) bits */ 14925e924450fcb23c11c07c95ea8964dd9f174652eDavid Jander/* Errata ERR005829 step7: Reserve first valid MB */ 15025e924450fcb23c11c07c95ea8964dd9f174652eDavid Jander#define FLEXCAN_TX_BUF_RESERVED 8 15125e924450fcb23c11c07c95ea8964dd9f174652eDavid Jander#define FLEXCAN_TX_BUF_ID 9 152e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_IFLAG_BUF(x) BIT(x) 153e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_IFLAG_RX_FIFO_OVERFLOW BIT(7) 154e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_IFLAG_RX_FIFO_WARN BIT(6) 155e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_IFLAG_RX_FIFO_AVAILABLE BIT(5) 156e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_IFLAG_DEFAULT \ 157e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde (FLEXCAN_IFLAG_RX_FIFO_OVERFLOW | FLEXCAN_IFLAG_RX_FIFO_AVAILABLE | \ 158e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_IFLAG_BUF(FLEXCAN_TX_BUF_ID)) 159e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 160e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* FLEXCAN message buffers */ 161e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MB_CNT_CODE(x) (((x) & 0xf) << 24) 162c32fe4ad3e4861b2bfa1f44114c564935a123ddaMarc Kleine-Budde#define FLEXCAN_MB_CODE_RX_INACTIVE (0x0 << 24) 163c32fe4ad3e4861b2bfa1f44114c564935a123ddaMarc Kleine-Budde#define FLEXCAN_MB_CODE_RX_EMPTY (0x4 << 24) 164c32fe4ad3e4861b2bfa1f44114c564935a123ddaMarc Kleine-Budde#define FLEXCAN_MB_CODE_RX_FULL (0x2 << 24) 165c32fe4ad3e4861b2bfa1f44114c564935a123ddaMarc Kleine-Budde#define FLEXCAN_MB_CODE_RX_OVERRRUN (0x6 << 24) 166c32fe4ad3e4861b2bfa1f44114c564935a123ddaMarc Kleine-Budde#define FLEXCAN_MB_CODE_RX_RANSWER (0xa << 24) 167c32fe4ad3e4861b2bfa1f44114c564935a123ddaMarc Kleine-Budde 168c32fe4ad3e4861b2bfa1f44114c564935a123ddaMarc Kleine-Budde#define FLEXCAN_MB_CODE_TX_INACTIVE (0x8 << 24) 169c32fe4ad3e4861b2bfa1f44114c564935a123ddaMarc Kleine-Budde#define FLEXCAN_MB_CODE_TX_ABORT (0x9 << 24) 170c32fe4ad3e4861b2bfa1f44114c564935a123ddaMarc Kleine-Budde#define FLEXCAN_MB_CODE_TX_DATA (0xc << 24) 171c32fe4ad3e4861b2bfa1f44114c564935a123ddaMarc Kleine-Budde#define FLEXCAN_MB_CODE_TX_TANSWER (0xe << 24) 172c32fe4ad3e4861b2bfa1f44114c564935a123ddaMarc Kleine-Budde 173e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MB_CNT_SRR BIT(22) 174e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MB_CNT_IDE BIT(21) 175e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MB_CNT_RTR BIT(20) 176e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MB_CNT_LENGTH(x) (((x) & 0xf) << 16) 177e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MB_CNT_TIMESTAMP(x) ((x) & 0xffff) 178e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 179e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde#define FLEXCAN_MB_CODE_MASK (0xf0ffffff) 180e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1819b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde#define FLEXCAN_TIMEOUT_US (50) 1829b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde 183bb698ca41ba574b3066ebbc5766e5980ae0051caWolfgang Grandegger/* 184bb698ca41ba574b3066ebbc5766e5980ae0051caWolfgang Grandegger * FLEXCAN hardware feature flags 185bb698ca41ba574b3066ebbc5766e5980ae0051caWolfgang Grandegger * 186bb698ca41ba574b3066ebbc5766e5980ae0051caWolfgang Grandegger * Below is some version info we got: 187cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner * SOC Version IP-Version Glitch- [TR]WRN_INT Memory err 188cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner * Filter? connected? detection 189cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner * MX25 FlexCAN2 03.00.00.00 no no no 190cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner * MX28 FlexCAN2 03.00.04.00 yes yes no 191cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner * MX35 FlexCAN2 03.00.00.00 no no no 192cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner * MX53 FlexCAN2 03.00.00.00 yes no no 193cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner * MX6s FlexCAN3 10.00.12.00 yes yes no 194cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner * VF610 FlexCAN3 ? no yes yes 195bb698ca41ba574b3066ebbc5766e5980ae0051caWolfgang Grandegger * 196bb698ca41ba574b3066ebbc5766e5980ae0051caWolfgang Grandegger * Some SOCs do not have the RX_WARN & TX_WARN interrupt line connected. 197bb698ca41ba574b3066ebbc5766e5980ae0051caWolfgang Grandegger */ 1984f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandegger#define FLEXCAN_HAS_V10_FEATURES BIT(1) /* For core version >= 10 */ 199bb698ca41ba574b3066ebbc5766e5980ae0051caWolfgang Grandegger#define FLEXCAN_HAS_BROKEN_ERR_STATE BIT(2) /* [TR]WRN_INT not connected */ 200cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner#define FLEXCAN_HAS_MECR_FEATURES BIT(3) /* Memory error detection */ 2014f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandegger 202e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* Structure of the message buffer */ 203e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestruct flexcan_mb { 204e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 can_ctrl; 205e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 can_id; 206e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 data[2]; 207e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde}; 208e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 209e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* Structure of the hardware registers */ 210e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestruct flexcan_regs { 211e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 mcr; /* 0x00 */ 212e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 ctrl; /* 0x04 */ 213e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 timer; /* 0x08 */ 214e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 _reserved1; /* 0x0c */ 215e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 rxgmask; /* 0x10 */ 216e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 rx14mask; /* 0x14 */ 217e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 rx15mask; /* 0x18 */ 218e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 ecr; /* 0x1c */ 219e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 esr; /* 0x20 */ 220e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 imask2; /* 0x24 */ 221e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 imask1; /* 0x28 */ 222e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 iflag2; /* 0x2c */ 223e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 iflag1; /* 0x30 */ 22430c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang u32 crl2; /* 0x34 */ 22530c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang u32 esr2; /* 0x38 */ 22630c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang u32 imeur; /* 0x3c */ 22730c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang u32 lrfr; /* 0x40 */ 22830c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang u32 crcr; /* 0x44 */ 22930c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang u32 rxfgmask; /* 0x48 */ 23030c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang u32 rxfir; /* 0x4c */ 231cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner u32 _reserved3[12]; /* 0x50 */ 232cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner struct flexcan_mb cantxfg[64]; /* 0x80 */ 233cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner u32 _reserved4[408]; 234cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner u32 mecr; /* 0xae0 */ 235cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner u32 erriar; /* 0xae4 */ 236cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner u32 erridpr; /* 0xae8 */ 237cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner u32 errippr; /* 0xaec */ 238cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner u32 rerrar; /* 0xaf0 */ 239cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner u32 rerrdr; /* 0xaf4 */ 240cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner u32 rerrsynr; /* 0xaf8 */ 241cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner u32 errsr; /* 0xafc */ 242e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde}; 243e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 24430c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wangstruct flexcan_devtype_data { 2454f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandegger u32 features; /* hardware controller features */ 24630c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang}; 24730c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang 248e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestruct flexcan_priv { 249e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct can_priv can; 250e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct net_device *dev; 251e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct napi_struct napi; 252e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 253e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde void __iomem *base; 254e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg_esr; 255e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg_ctrl_default; 256e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 2573d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar struct clk *clk_ipg; 2583d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar struct clk *clk_per; 259e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_platform_data *pdata; 260dda0b3bd1cbb66ee869d589f7d719f703d7c38a1Marc Kleine-Budde const struct flexcan_devtype_data *devtype_data; 261b7c4114b07bbacfe0aee1d04ad1ade9e42309620Fabio Estevam struct regulator *reg_xceiver; 26230c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang}; 26330c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang 26430c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wangstatic struct flexcan_devtype_data fsl_p1010_devtype_data = { 2654f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandegger .features = FLEXCAN_HAS_BROKEN_ERR_STATE, 26630c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang}; 2674f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandeggerstatic struct flexcan_devtype_data fsl_imx28_devtype_data; 26830c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wangstatic struct flexcan_devtype_data fsl_imx6q_devtype_data = { 269bb698ca41ba574b3066ebbc5766e5980ae0051caWolfgang Grandegger .features = FLEXCAN_HAS_V10_FEATURES, 270e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde}; 271cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agnerstatic struct flexcan_devtype_data fsl_vf610_devtype_data = { 272cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner .features = FLEXCAN_HAS_V10_FEATURES | FLEXCAN_HAS_MECR_FEATURES, 273cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner}; 274e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 275194b9a4cb91713ddb60c9f98f7212f6d8cb8e05fMarc Kleine-Buddestatic const struct can_bittiming_const flexcan_bittiming_const = { 276e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .name = DRV_NAME, 277e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .tseg1_min = 4, 278e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .tseg1_max = 16, 279e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .tseg2_min = 2, 280e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .tseg2_max = 8, 281e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .sjw_max = 4, 282e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .brp_min = 1, 283e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .brp_max = 256, 284e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .brp_inc = 1, 285e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde}; 286e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 287e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* 2880e4b949e6620689b1d3142e20bca2c9d1f918fdaArnd Bergmann * Abstract off the read/write for arm versus ppc. This 2890e4b949e6620689b1d3142e20bca2c9d1f918fdaArnd Bergmann * assumes that PPC uses big-endian registers and everything 2900e4b949e6620689b1d3142e20bca2c9d1f918fdaArnd Bergmann * else uses little-endian registers, independent of CPU 2910e4b949e6620689b1d3142e20bca2c9d1f918fdaArnd Bergmann * endianess. 29261e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com */ 2930e4b949e6620689b1d3142e20bca2c9d1f918fdaArnd Bergmann#if defined(CONFIG_PPC) 29461e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.comstatic inline u32 flexcan_read(void __iomem *addr) 29561e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com{ 29661e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com return in_be32(addr); 29761e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com} 29861e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com 29961e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.comstatic inline void flexcan_write(u32 val, void __iomem *addr) 30061e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com{ 30161e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com out_be32(addr, val); 30261e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com} 30361e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com#else 30461e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.comstatic inline u32 flexcan_read(void __iomem *addr) 30561e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com{ 30661e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com return readl(addr); 30761e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com} 30861e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com 30961e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.comstatic inline void flexcan_write(u32 val, void __iomem *addr) 31061e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com{ 31161e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com writel(val, addr); 31261e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com} 31361e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com#endif 31461e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com 315f003698e23f6f56a791774f14d0ac35d04872490Marc Kleine-Buddestatic inline int flexcan_transceiver_enable(const struct flexcan_priv *priv) 316f003698e23f6f56a791774f14d0ac35d04872490Marc Kleine-Budde{ 317f003698e23f6f56a791774f14d0ac35d04872490Marc Kleine-Budde if (!priv->reg_xceiver) 318f003698e23f6f56a791774f14d0ac35d04872490Marc Kleine-Budde return 0; 319f003698e23f6f56a791774f14d0ac35d04872490Marc Kleine-Budde 320f003698e23f6f56a791774f14d0ac35d04872490Marc Kleine-Budde return regulator_enable(priv->reg_xceiver); 321f003698e23f6f56a791774f14d0ac35d04872490Marc Kleine-Budde} 322f003698e23f6f56a791774f14d0ac35d04872490Marc Kleine-Budde 323f003698e23f6f56a791774f14d0ac35d04872490Marc Kleine-Buddestatic inline int flexcan_transceiver_disable(const struct flexcan_priv *priv) 324f003698e23f6f56a791774f14d0ac35d04872490Marc Kleine-Budde{ 325f003698e23f6f56a791774f14d0ac35d04872490Marc Kleine-Budde if (!priv->reg_xceiver) 326f003698e23f6f56a791774f14d0ac35d04872490Marc Kleine-Budde return 0; 327f003698e23f6f56a791774f14d0ac35d04872490Marc Kleine-Budde 328f003698e23f6f56a791774f14d0ac35d04872490Marc Kleine-Budde return regulator_disable(priv->reg_xceiver); 329f003698e23f6f56a791774f14d0ac35d04872490Marc Kleine-Budde} 330f003698e23f6f56a791774f14d0ac35d04872490Marc Kleine-Budde 331e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic inline int flexcan_has_and_handle_berr(const struct flexcan_priv *priv, 332e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg_esr) 333e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 334e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING) && 335e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde (reg_esr & FLEXCAN_ESR_ERR_BUS); 336e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 337e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 3389b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Buddestatic int flexcan_chip_enable(struct flexcan_priv *priv) 339e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 340e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 3419b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde unsigned int timeout = FLEXCAN_TIMEOUT_US / 10; 342e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg; 343e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 34461e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg = flexcan_read(®s->mcr); 345e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg &= ~FLEXCAN_MCR_MDIS; 34661e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(reg, ®s->mcr); 347e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 3489b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde while (timeout-- && (flexcan_read(®s->mcr) & FLEXCAN_MCR_LPM_ACK)) 3498badd65e48c90d66587359d5329c2813088c0f50David Jander udelay(10); 3509b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde 3519b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde if (flexcan_read(®s->mcr) & FLEXCAN_MCR_LPM_ACK) 3529b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde return -ETIMEDOUT; 3539b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde 3549b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde return 0; 355e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 356e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 3579b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Buddestatic int flexcan_chip_disable(struct flexcan_priv *priv) 358e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 359e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 3609b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde unsigned int timeout = FLEXCAN_TIMEOUT_US / 10; 361e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg; 362e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 36361e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg = flexcan_read(®s->mcr); 364e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg |= FLEXCAN_MCR_MDIS; 36561e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(reg, ®s->mcr); 3669b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde 3679b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde while (timeout-- && !(flexcan_read(®s->mcr) & FLEXCAN_MCR_LPM_ACK)) 3688badd65e48c90d66587359d5329c2813088c0f50David Jander udelay(10); 3699b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde 3709b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde if (!(flexcan_read(®s->mcr) & FLEXCAN_MCR_LPM_ACK)) 3719b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde return -ETIMEDOUT; 3729b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde 3739b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde return 0; 374e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 375e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 376b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Buddestatic int flexcan_chip_freeze(struct flexcan_priv *priv) 377b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde{ 378b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 379b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde unsigned int timeout = 1000 * 1000 * 10 / priv->can.bittiming.bitrate; 380b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde u32 reg; 381b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde 382b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde reg = flexcan_read(®s->mcr); 383b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde reg |= FLEXCAN_MCR_HALT; 384b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde flexcan_write(reg, ®s->mcr); 385b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde 386b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde while (timeout-- && !(flexcan_read(®s->mcr) & FLEXCAN_MCR_FRZ_ACK)) 3878badd65e48c90d66587359d5329c2813088c0f50David Jander udelay(100); 388b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde 389b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde if (!(flexcan_read(®s->mcr) & FLEXCAN_MCR_FRZ_ACK)) 390b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde return -ETIMEDOUT; 391b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde 392b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde return 0; 393b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde} 394b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde 395b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Buddestatic int flexcan_chip_unfreeze(struct flexcan_priv *priv) 396b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde{ 397b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 398b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde unsigned int timeout = FLEXCAN_TIMEOUT_US / 10; 399b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde u32 reg; 400b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde 401b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde reg = flexcan_read(®s->mcr); 402b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde reg &= ~FLEXCAN_MCR_HALT; 403b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde flexcan_write(reg, ®s->mcr); 404b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde 405b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde while (timeout-- && (flexcan_read(®s->mcr) & FLEXCAN_MCR_FRZ_ACK)) 4068badd65e48c90d66587359d5329c2813088c0f50David Jander udelay(10); 407b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde 408b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde if (flexcan_read(®s->mcr) & FLEXCAN_MCR_FRZ_ACK) 409b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde return -ETIMEDOUT; 410b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde 411b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde return 0; 412b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde} 413b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde 4144b5b82274a17f0ebbf02378df2ba7f36a3f5af19Marc Kleine-Buddestatic int flexcan_chip_softreset(struct flexcan_priv *priv) 4154b5b82274a17f0ebbf02378df2ba7f36a3f5af19Marc Kleine-Budde{ 4164b5b82274a17f0ebbf02378df2ba7f36a3f5af19Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 4174b5b82274a17f0ebbf02378df2ba7f36a3f5af19Marc Kleine-Budde unsigned int timeout = FLEXCAN_TIMEOUT_US / 10; 4184b5b82274a17f0ebbf02378df2ba7f36a3f5af19Marc Kleine-Budde 4194b5b82274a17f0ebbf02378df2ba7f36a3f5af19Marc Kleine-Budde flexcan_write(FLEXCAN_MCR_SOFTRST, ®s->mcr); 4204b5b82274a17f0ebbf02378df2ba7f36a3f5af19Marc Kleine-Budde while (timeout-- && (flexcan_read(®s->mcr) & FLEXCAN_MCR_SOFTRST)) 4218badd65e48c90d66587359d5329c2813088c0f50David Jander udelay(10); 4224b5b82274a17f0ebbf02378df2ba7f36a3f5af19Marc Kleine-Budde 4234b5b82274a17f0ebbf02378df2ba7f36a3f5af19Marc Kleine-Budde if (flexcan_read(®s->mcr) & FLEXCAN_MCR_SOFTRST) 4244b5b82274a17f0ebbf02378df2ba7f36a3f5af19Marc Kleine-Budde return -ETIMEDOUT; 4254b5b82274a17f0ebbf02378df2ba7f36a3f5af19Marc Kleine-Budde 4264b5b82274a17f0ebbf02378df2ba7f36a3f5af19Marc Kleine-Budde return 0; 4274b5b82274a17f0ebbf02378df2ba7f36a3f5af19Marc Kleine-Budde} 4284b5b82274a17f0ebbf02378df2ba7f36a3f5af19Marc Kleine-Budde 429ec56acfef2af184ca485ffeba16adbd56c110c94Stefan Agner 430ec56acfef2af184ca485ffeba16adbd56c110c94Stefan Agnerstatic int __flexcan_get_berr_counter(const struct net_device *dev, 431ec56acfef2af184ca485ffeba16adbd56c110c94Stefan Agner struct can_berr_counter *bec) 432e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 433e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde const struct flexcan_priv *priv = netdev_priv(dev); 434e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 43561e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com u32 reg = flexcan_read(®s->ecr); 436e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 437e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde bec->txerr = (reg >> 0) & 0xff; 438e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde bec->rxerr = (reg >> 8) & 0xff; 439e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 440e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 441e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 442e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 443ec56acfef2af184ca485ffeba16adbd56c110c94Stefan Agnerstatic int flexcan_get_berr_counter(const struct net_device *dev, 444ec56acfef2af184ca485ffeba16adbd56c110c94Stefan Agner struct can_berr_counter *bec) 445ec56acfef2af184ca485ffeba16adbd56c110c94Stefan Agner{ 446ec56acfef2af184ca485ffeba16adbd56c110c94Stefan Agner const struct flexcan_priv *priv = netdev_priv(dev); 447ec56acfef2af184ca485ffeba16adbd56c110c94Stefan Agner int err; 448ec56acfef2af184ca485ffeba16adbd56c110c94Stefan Agner 449ec56acfef2af184ca485ffeba16adbd56c110c94Stefan Agner err = clk_prepare_enable(priv->clk_ipg); 450ec56acfef2af184ca485ffeba16adbd56c110c94Stefan Agner if (err) 451ec56acfef2af184ca485ffeba16adbd56c110c94Stefan Agner return err; 452ec56acfef2af184ca485ffeba16adbd56c110c94Stefan Agner 453ec56acfef2af184ca485ffeba16adbd56c110c94Stefan Agner err = clk_prepare_enable(priv->clk_per); 454ec56acfef2af184ca485ffeba16adbd56c110c94Stefan Agner if (err) 455ec56acfef2af184ca485ffeba16adbd56c110c94Stefan Agner goto out_disable_ipg; 456ec56acfef2af184ca485ffeba16adbd56c110c94Stefan Agner 457ec56acfef2af184ca485ffeba16adbd56c110c94Stefan Agner err = __flexcan_get_berr_counter(dev, bec); 458ec56acfef2af184ca485ffeba16adbd56c110c94Stefan Agner 459ec56acfef2af184ca485ffeba16adbd56c110c94Stefan Agner clk_disable_unprepare(priv->clk_per); 460ec56acfef2af184ca485ffeba16adbd56c110c94Stefan Agner out_disable_ipg: 461ec56acfef2af184ca485ffeba16adbd56c110c94Stefan Agner clk_disable_unprepare(priv->clk_ipg); 462ec56acfef2af184ca485ffeba16adbd56c110c94Stefan Agner 463ec56acfef2af184ca485ffeba16adbd56c110c94Stefan Agner return err; 464ec56acfef2af184ca485ffeba16adbd56c110c94Stefan Agner} 465ec56acfef2af184ca485ffeba16adbd56c110c94Stefan Agner 466e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int flexcan_start_xmit(struct sk_buff *skb, struct net_device *dev) 467e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 468e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde const struct flexcan_priv *priv = netdev_priv(dev); 469e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 470e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct can_frame *cf = (struct can_frame *)skb->data; 471e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 can_id; 472e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 ctrl = FLEXCAN_MB_CNT_CODE(0xc) | (cf->can_dlc << 16); 473e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 474e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (can_dropped_invalid_skb(dev, skb)) 475e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return NETDEV_TX_OK; 476e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 477e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde netif_stop_queue(dev); 478e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 479e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (cf->can_id & CAN_EFF_FLAG) { 480e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde can_id = cf->can_id & CAN_EFF_MASK; 481e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde ctrl |= FLEXCAN_MB_CNT_IDE | FLEXCAN_MB_CNT_SRR; 482e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } else { 483e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde can_id = (cf->can_id & CAN_SFF_MASK) << 18; 484e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 485e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 486e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (cf->can_id & CAN_RTR_FLAG) 487e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde ctrl |= FLEXCAN_MB_CNT_RTR; 488e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 489e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (cf->can_dlc > 0) { 490e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 data = be32_to_cpup((__be32 *)&cf->data[0]); 49161e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(data, ®s->cantxfg[FLEXCAN_TX_BUF_ID].data[0]); 492e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 493e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (cf->can_dlc > 3) { 494e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 data = be32_to_cpup((__be32 *)&cf->data[4]); 49561e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(data, ®s->cantxfg[FLEXCAN_TX_BUF_ID].data[1]); 496e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 497e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 4989a12349663061d25b49e6542d005fa7193a2cb44Reuben Dowle can_put_echo_skb(skb, dev, 0); 4999a12349663061d25b49e6542d005fa7193a2cb44Reuben Dowle 50061e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(can_id, ®s->cantxfg[FLEXCAN_TX_BUF_ID].can_id); 50161e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(ctrl, ®s->cantxfg[FLEXCAN_TX_BUF_ID].can_ctrl); 502e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 50325e924450fcb23c11c07c95ea8964dd9f174652eDavid Jander /* Errata ERR005829 step8: 50425e924450fcb23c11c07c95ea8964dd9f174652eDavid Jander * Write twice INACTIVE(0x8) code to first MB. 50525e924450fcb23c11c07c95ea8964dd9f174652eDavid Jander */ 50625e924450fcb23c11c07c95ea8964dd9f174652eDavid Jander flexcan_write(FLEXCAN_MB_CODE_TX_INACTIVE, 50725e924450fcb23c11c07c95ea8964dd9f174652eDavid Jander ®s->cantxfg[FLEXCAN_TX_BUF_RESERVED].can_ctrl); 50825e924450fcb23c11c07c95ea8964dd9f174652eDavid Jander flexcan_write(FLEXCAN_MB_CODE_TX_INACTIVE, 50925e924450fcb23c11c07c95ea8964dd9f174652eDavid Jander ®s->cantxfg[FLEXCAN_TX_BUF_RESERVED].can_ctrl); 51025e924450fcb23c11c07c95ea8964dd9f174652eDavid Jander 511e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return NETDEV_TX_OK; 512e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 513e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 514e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic void do_bus_err(struct net_device *dev, 515e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct can_frame *cf, u32 reg_esr) 516e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 517e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv = netdev_priv(dev); 518e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde int rx_errors = 0, tx_errors = 0; 519e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 520e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR; 521e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 522e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (reg_esr & FLEXCAN_ESR_BIT1_ERR) { 523aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "BIT1_ERR irq\n"); 524e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->data[2] |= CAN_ERR_PROT_BIT1; 525e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde tx_errors = 1; 526e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 527e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (reg_esr & FLEXCAN_ESR_BIT0_ERR) { 528aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "BIT0_ERR irq\n"); 529e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->data[2] |= CAN_ERR_PROT_BIT0; 530e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde tx_errors = 1; 531e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 532e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (reg_esr & FLEXCAN_ESR_ACK_ERR) { 533aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "ACK_ERR irq\n"); 534e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->can_id |= CAN_ERR_ACK; 535e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->data[3] |= CAN_ERR_PROT_LOC_ACK; 536e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde tx_errors = 1; 537e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 538e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (reg_esr & FLEXCAN_ESR_CRC_ERR) { 539aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "CRC_ERR irq\n"); 540e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->data[2] |= CAN_ERR_PROT_BIT; 541e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->data[3] |= CAN_ERR_PROT_LOC_CRC_SEQ; 542e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde rx_errors = 1; 543e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 544e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (reg_esr & FLEXCAN_ESR_FRM_ERR) { 545aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "FRM_ERR irq\n"); 546e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->data[2] |= CAN_ERR_PROT_FORM; 547e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde rx_errors = 1; 548e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 549e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (reg_esr & FLEXCAN_ESR_STF_ERR) { 550aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "STF_ERR irq\n"); 551e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->data[2] |= CAN_ERR_PROT_STUFF; 552e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde rx_errors = 1; 553e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 554e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 555e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->can.can_stats.bus_error++; 556e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (rx_errors) 557e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev->stats.rx_errors++; 558e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (tx_errors) 559e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev->stats.tx_errors++; 560e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 561e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 562e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int flexcan_poll_bus_err(struct net_device *dev, u32 reg_esr) 563e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 564e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct sk_buff *skb; 565e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct can_frame *cf; 566e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 567e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde skb = alloc_can_err_skb(dev, &cf); 568e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (unlikely(!skb)) 569e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 570e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 571e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde do_bus_err(dev, cf, reg_esr); 572e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde netif_receive_skb(skb); 573e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 574e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev->stats.rx_packets++; 575e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev->stats.rx_bytes += cf->can_dlc; 576e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 577e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 1; 578e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 579e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 580e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic void do_state(struct net_device *dev, 581e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct can_frame *cf, enum can_state new_state) 582e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 583e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv = netdev_priv(dev); 584e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct can_berr_counter bec; 585e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 586ec56acfef2af184ca485ffeba16adbd56c110c94Stefan Agner __flexcan_get_berr_counter(dev, &bec); 587e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 588e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde switch (priv->can.state) { 589e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde case CAN_STATE_ERROR_ACTIVE: 590e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* 591e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * from: ERROR_ACTIVE 592e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * to : ERROR_WARNING, ERROR_PASSIVE, BUS_OFF 593e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * => : there was a warning int 594e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 595e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (new_state >= CAN_STATE_ERROR_WARNING && 596e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde new_state <= CAN_STATE_BUS_OFF) { 597aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "Error Warning IRQ\n"); 598e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->can.can_stats.error_warning++; 599e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 600e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->can_id |= CAN_ERR_CRTL; 601e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->data[1] = (bec.txerr > bec.rxerr) ? 602e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde CAN_ERR_CRTL_TX_WARNING : 603e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde CAN_ERR_CRTL_RX_WARNING; 604e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 605e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde case CAN_STATE_ERROR_WARNING: /* fallthrough */ 606e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* 607e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * from: ERROR_ACTIVE, ERROR_WARNING 608e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * to : ERROR_PASSIVE, BUS_OFF 609e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * => : error passive int 610e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 611e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (new_state >= CAN_STATE_ERROR_PASSIVE && 612e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde new_state <= CAN_STATE_BUS_OFF) { 613aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "Error Passive IRQ\n"); 614e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->can.can_stats.error_passive++; 615e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 616e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->can_id |= CAN_ERR_CRTL; 617e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->data[1] = (bec.txerr > bec.rxerr) ? 618e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde CAN_ERR_CRTL_TX_PASSIVE : 619e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde CAN_ERR_CRTL_RX_PASSIVE; 620e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 621e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde break; 622e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde case CAN_STATE_BUS_OFF: 623aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_err(dev, "BUG! " 624aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger "hardware recovered automatically from BUS_OFF\n"); 625e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde break; 626e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde default: 627e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde break; 628e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 629e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 630e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* process state changes depending on the new state */ 631e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde switch (new_state) { 6328ce261d0bb491da957278cdcba207791f329d1daSebastian Andrzej Siewior case CAN_STATE_ERROR_WARNING: 6338ce261d0bb491da957278cdcba207791f329d1daSebastian Andrzej Siewior netdev_dbg(dev, "Error Warning\n"); 6348ce261d0bb491da957278cdcba207791f329d1daSebastian Andrzej Siewior cf->can_id |= CAN_ERR_CRTL; 6358ce261d0bb491da957278cdcba207791f329d1daSebastian Andrzej Siewior cf->data[1] = (bec.txerr > bec.rxerr) ? 6368ce261d0bb491da957278cdcba207791f329d1daSebastian Andrzej Siewior CAN_ERR_CRTL_TX_WARNING : 6378ce261d0bb491da957278cdcba207791f329d1daSebastian Andrzej Siewior CAN_ERR_CRTL_RX_WARNING; 6388ce261d0bb491da957278cdcba207791f329d1daSebastian Andrzej Siewior break; 639e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde case CAN_STATE_ERROR_ACTIVE: 640aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "Error Active\n"); 641e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->can_id |= CAN_ERR_PROT; 642e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->data[2] = CAN_ERR_PROT_ACTIVE; 643e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde break; 644e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde case CAN_STATE_BUS_OFF: 645e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->can_id |= CAN_ERR_BUSOFF; 646e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde can_bus_off(dev); 647e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde break; 648e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde default: 649e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde break; 650e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 651e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 652e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 653e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int flexcan_poll_state(struct net_device *dev, u32 reg_esr) 654e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 655e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv = netdev_priv(dev); 656e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct sk_buff *skb; 657e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct can_frame *cf; 658e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde enum can_state new_state; 659e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde int flt; 660e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 661e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flt = reg_esr & FLEXCAN_ESR_FLT_CONF_MASK; 662e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (likely(flt == FLEXCAN_ESR_FLT_CONF_ACTIVE)) { 663e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (likely(!(reg_esr & (FLEXCAN_ESR_TX_WRN | 664e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_ESR_RX_WRN)))) 665e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde new_state = CAN_STATE_ERROR_ACTIVE; 666e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde else 667e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde new_state = CAN_STATE_ERROR_WARNING; 668e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } else if (unlikely(flt == FLEXCAN_ESR_FLT_CONF_PASSIVE)) 669e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde new_state = CAN_STATE_ERROR_PASSIVE; 670e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde else 671e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde new_state = CAN_STATE_BUS_OFF; 672e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 673e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* state hasn't changed */ 674e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (likely(new_state == priv->can.state)) 675e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 676e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 677e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde skb = alloc_can_err_skb(dev, &cf); 678e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (unlikely(!skb)) 679e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 680e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 681e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde do_state(dev, cf, new_state); 682e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->can.state = new_state; 683e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde netif_receive_skb(skb); 684e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 685e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev->stats.rx_packets++; 686e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev->stats.rx_bytes += cf->can_dlc; 687e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 688e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 1; 689e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 690e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 691e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic void flexcan_read_fifo(const struct net_device *dev, 692e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct can_frame *cf) 693e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 694e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde const struct flexcan_priv *priv = netdev_priv(dev); 695e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 696e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_mb __iomem *mb = ®s->cantxfg[0]; 697e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg_ctrl, reg_id; 698e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 69961e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg_ctrl = flexcan_read(&mb->can_ctrl); 70061e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg_id = flexcan_read(&mb->can_id); 701e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (reg_ctrl & FLEXCAN_MB_CNT_IDE) 702e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->can_id = ((reg_id >> 0) & CAN_EFF_MASK) | CAN_EFF_FLAG; 703e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde else 704e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->can_id = (reg_id >> 18) & CAN_SFF_MASK; 705e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 706e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (reg_ctrl & FLEXCAN_MB_CNT_RTR) 707e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->can_id |= CAN_RTR_FLAG; 708e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde cf->can_dlc = get_can_dlc((reg_ctrl >> 16) & 0xf); 709e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 71061e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com *(__be32 *)(cf->data + 0) = cpu_to_be32(flexcan_read(&mb->data[0])); 71161e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com *(__be32 *)(cf->data + 4) = cpu_to_be32(flexcan_read(&mb->data[1])); 712e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 713e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* mark as read */ 71461e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(FLEXCAN_IFLAG_RX_FIFO_AVAILABLE, ®s->iflag1); 71561e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_read(®s->timer); 716e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 717e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 718e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int flexcan_read_frame(struct net_device *dev) 719e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 720e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct net_device_stats *stats = &dev->stats; 721e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct can_frame *cf; 722e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct sk_buff *skb; 723e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 724e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde skb = alloc_can_skb(dev, &cf); 725e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (unlikely(!skb)) { 726e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde stats->rx_dropped++; 727e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 728e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 729e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 730e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flexcan_read_fifo(dev, cf); 731e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde netif_receive_skb(skb); 732e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 733e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde stats->rx_packets++; 734e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde stats->rx_bytes += cf->can_dlc; 735e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 736adccadb92f0571fd0f9b2ac8011057a7de9e3e63Fabio Baltieri can_led_event(dev, CAN_LED_EVENT_RX); 737adccadb92f0571fd0f9b2ac8011057a7de9e3e63Fabio Baltieri 738e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 1; 739e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 740e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 741e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int flexcan_poll(struct napi_struct *napi, int quota) 742e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 743e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct net_device *dev = napi->dev; 744e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde const struct flexcan_priv *priv = netdev_priv(dev); 745e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 746e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg_iflag1, reg_esr; 747e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde int work_done = 0; 748e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 749e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* 750e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * The error bits are cleared on read, 751e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * use saved value from irq handler. 752e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 75361e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg_esr = flexcan_read(®s->esr) | priv->reg_esr; 754e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 755e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* handle state changes */ 756e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde work_done += flexcan_poll_state(dev, reg_esr); 757e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 758e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* handle RX-FIFO */ 75961e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg_iflag1 = flexcan_read(®s->iflag1); 760e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde while (reg_iflag1 & FLEXCAN_IFLAG_RX_FIFO_AVAILABLE && 761e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde work_done < quota) { 762e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde work_done += flexcan_read_frame(dev); 76361e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg_iflag1 = flexcan_read(®s->iflag1); 764e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 765e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 766e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* report bus errors */ 767e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (flexcan_has_and_handle_berr(priv, reg_esr) && work_done < quota) 768e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde work_done += flexcan_poll_bus_err(dev, reg_esr); 769e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 770e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (work_done < quota) { 771e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde napi_complete(napi); 772e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* enable IRQs */ 77361e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(FLEXCAN_IFLAG_DEFAULT, ®s->imask1); 77461e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(priv->reg_ctrl_default, ®s->ctrl); 775e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 776e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 777e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return work_done; 778e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 779e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 780e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic irqreturn_t flexcan_irq(int irq, void *dev_id) 781e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 782e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct net_device *dev = dev_id; 783e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct net_device_stats *stats = &dev->stats; 784e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv = netdev_priv(dev); 785e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 786e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg_iflag1, reg_esr; 787e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 78861e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg_iflag1 = flexcan_read(®s->iflag1); 78961e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg_esr = flexcan_read(®s->esr); 7906e9d554fa6e481a848358c215f129432262123c0Wolfgang Grandegger /* ACK all bus error and state change IRQ sources */ 7916e9d554fa6e481a848358c215f129432262123c0Wolfgang Grandegger if (reg_esr & FLEXCAN_ESR_ALL_INT) 7926e9d554fa6e481a848358c215f129432262123c0Wolfgang Grandegger flexcan_write(reg_esr & FLEXCAN_ESR_ALL_INT, ®s->esr); 793e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 794e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* 795e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * schedule NAPI in case of: 796e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * - rx IRQ 797e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * - state change IRQ 798e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * - bus error IRQ and bus error reporting is activated 799e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 800e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if ((reg_iflag1 & FLEXCAN_IFLAG_RX_FIFO_AVAILABLE) || 801e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde (reg_esr & FLEXCAN_ESR_ERR_STATE) || 802e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flexcan_has_and_handle_berr(priv, reg_esr)) { 803e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* 804e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * The error bits are cleared on read, 805e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * save them for later use. 806e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 807e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->reg_esr = reg_esr & FLEXCAN_ESR_ERR_BUS; 80861e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(FLEXCAN_IFLAG_DEFAULT & 80961e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com ~FLEXCAN_IFLAG_RX_FIFO_AVAILABLE, ®s->imask1); 81061e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(priv->reg_ctrl_default & ~FLEXCAN_CTRL_ERR_ALL, 811e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde ®s->ctrl); 812e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde napi_schedule(&priv->napi); 813e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 814e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 815e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* FIFO overflow */ 816e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (reg_iflag1 & FLEXCAN_IFLAG_RX_FIFO_OVERFLOW) { 81761e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(FLEXCAN_IFLAG_RX_FIFO_OVERFLOW, ®s->iflag1); 818e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev->stats.rx_over_errors++; 819e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev->stats.rx_errors++; 820e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 821e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 822e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* transmission complete interrupt */ 823e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (reg_iflag1 & (1 << FLEXCAN_TX_BUF_ID)) { 8249a12349663061d25b49e6542d005fa7193a2cb44Reuben Dowle stats->tx_bytes += can_get_echo_skb(dev, 0); 825e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde stats->tx_packets++; 826adccadb92f0571fd0f9b2ac8011057a7de9e3e63Fabio Baltieri can_led_event(dev, CAN_LED_EVENT_TX); 827de5944883ebbedbf5adc8497659772f5da7b7d72Marc Kleine-Budde /* after sending a RTR frame mailbox is in RX mode */ 828de5944883ebbedbf5adc8497659772f5da7b7d72Marc Kleine-Budde flexcan_write(FLEXCAN_MB_CODE_TX_INACTIVE, 829de5944883ebbedbf5adc8497659772f5da7b7d72Marc Kleine-Budde ®s->cantxfg[FLEXCAN_TX_BUF_ID].can_ctrl); 83061e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write((1 << FLEXCAN_TX_BUF_ID), ®s->iflag1); 831e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde netif_wake_queue(dev); 832e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 833e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 834e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return IRQ_HANDLED; 835e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 836e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 837e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic void flexcan_set_bittiming(struct net_device *dev) 838e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 839e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde const struct flexcan_priv *priv = netdev_priv(dev); 840e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde const struct can_bittiming *bt = &priv->can.bittiming; 841e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 842e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg; 843e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 84461e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg = flexcan_read(®s->ctrl); 845e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg &= ~(FLEXCAN_CTRL_PRESDIV(0xff) | 846e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_RJW(0x3) | 847e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_PSEG1(0x7) | 848e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_PSEG2(0x7) | 849e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_PROPSEG(0x7) | 850e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_LPB | 851e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_SMP | 852e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_LOM); 853e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 854e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg |= FLEXCAN_CTRL_PRESDIV(bt->brp - 1) | 855e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_PSEG1(bt->phase_seg1 - 1) | 856e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_PSEG2(bt->phase_seg2 - 1) | 857e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_RJW(bt->sjw - 1) | 858e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_CTRL_PROPSEG(bt->prop_seg - 1); 859e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 860e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK) 861e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg |= FLEXCAN_CTRL_LPB; 862e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY) 863e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg |= FLEXCAN_CTRL_LOM; 864e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) 865e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg |= FLEXCAN_CTRL_SMP; 866e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 867aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_info(dev, "writing ctrl=0x%08x\n", reg); 86861e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(reg, ®s->ctrl); 869e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 870e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* print chip status */ 871aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "%s: mcr=0x%08x ctrl=0x%08x\n", __func__, 872aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger flexcan_read(®s->mcr), flexcan_read(®s->ctrl)); 873e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 874e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 875e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* 876e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * flexcan_chip_start 877e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 878e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * this functions is entered with clocks enabled 879e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 880e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 881e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int flexcan_chip_start(struct net_device *dev) 882e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 883e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv = netdev_priv(dev); 884e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 885cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner u32 reg_mcr, reg_ctrl, reg_crl2, reg_mecr; 8861f6d80358dc9bbbeb56cb43384fa11fd645d9289David S. Miller int err, i; 887e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 888e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* enable module */ 8899b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde err = flexcan_chip_enable(priv); 8909b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde if (err) 8919b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde return err; 892e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 893e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* soft reset */ 8944b5b82274a17f0ebbf02378df2ba7f36a3f5af19Marc Kleine-Budde err = flexcan_chip_softreset(priv); 8954b5b82274a17f0ebbf02378df2ba7f36a3f5af19Marc Kleine-Budde if (err) 896b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde goto out_chip_disable; 897e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 898e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flexcan_set_bittiming(dev); 899e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 900e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* 901e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * MCR 902e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 903e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * enable freeze 904e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * enable fifo 905e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * halt now 906e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * only supervisor access 907e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * enable warning int 908e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * choose format C 9099a12349663061d25b49e6542d005fa7193a2cb44Reuben Dowle * disable local echo 910e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 911e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 91261e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg_mcr = flexcan_read(®s->mcr); 913d5a7b406c529e4595ce03dc8f6dcf7fa36f106faMarc Kleine-Budde reg_mcr &= ~FLEXCAN_MCR_MAXMB(0xff); 914e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg_mcr |= FLEXCAN_MCR_FRZ | FLEXCAN_MCR_FEN | FLEXCAN_MCR_HALT | 915e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_MCR_SUPV | FLEXCAN_MCR_WRN_EN | 916d5a7b406c529e4595ce03dc8f6dcf7fa36f106faMarc Kleine-Budde FLEXCAN_MCR_IDAM_C | FLEXCAN_MCR_SRX_DIS | 917d5a7b406c529e4595ce03dc8f6dcf7fa36f106faMarc Kleine-Budde FLEXCAN_MCR_MAXMB(FLEXCAN_TX_BUF_ID); 918aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "%s: writing mcr=0x%08x", __func__, reg_mcr); 91961e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(reg_mcr, ®s->mcr); 920e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 921e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* 922e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * CTRL 923e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 924e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * disable timer sync feature 925e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 926e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * disable auto busoff recovery 927e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * transmit lowest buffer first 928e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 929e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * enable tx and rx warning interrupt 930e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * enable bus off interrupt 931e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * (== FLEXCAN_CTRL_ERR_STATE) 932e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 93361e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg_ctrl = flexcan_read(®s->ctrl); 934e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg_ctrl &= ~FLEXCAN_CTRL_TSYN; 935e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg_ctrl |= FLEXCAN_CTRL_BOFF_REC | FLEXCAN_CTRL_LBUF | 9364f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandegger FLEXCAN_CTRL_ERR_STATE; 9374f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandegger /* 9384f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandegger * enable the "error interrupt" (FLEXCAN_CTRL_ERR_MSK), 9394f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandegger * on most Flexcan cores, too. Otherwise we don't get 9404f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandegger * any error warning or passive interrupts. 9414f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandegger */ 9424f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandegger if (priv->devtype_data->features & FLEXCAN_HAS_BROKEN_ERR_STATE || 9434f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandegger priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING) 9444f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandegger reg_ctrl |= FLEXCAN_CTRL_ERR_MSK; 945bc03a54139baafcd8fe89ad115411c2c9c8a4905Alexander Stein else 946bc03a54139baafcd8fe89ad115411c2c9c8a4905Alexander Stein reg_ctrl &= ~FLEXCAN_CTRL_ERR_MSK; 947e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 948e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* save for later use */ 949e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->reg_ctrl_default = reg_ctrl; 950aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "%s: writing ctrl=0x%08x", __func__, reg_ctrl); 95161e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(reg_ctrl, ®s->ctrl); 952e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 953fc05b884a31dbf259cc73cc856e634ec3acbebb6David Jander /* clear and invalidate all mailboxes first */ 954fc05b884a31dbf259cc73cc856e634ec3acbebb6David Jander for (i = FLEXCAN_TX_BUF_ID; i < ARRAY_SIZE(regs->cantxfg); i++) { 955fc05b884a31dbf259cc73cc856e634ec3acbebb6David Jander flexcan_write(FLEXCAN_MB_CODE_RX_INACTIVE, 956fc05b884a31dbf259cc73cc856e634ec3acbebb6David Jander ®s->cantxfg[i].can_ctrl); 957fc05b884a31dbf259cc73cc856e634ec3acbebb6David Jander } 958fc05b884a31dbf259cc73cc856e634ec3acbebb6David Jander 95925e924450fcb23c11c07c95ea8964dd9f174652eDavid Jander /* Errata ERR005829: mark first TX mailbox as INACTIVE */ 96025e924450fcb23c11c07c95ea8964dd9f174652eDavid Jander flexcan_write(FLEXCAN_MB_CODE_TX_INACTIVE, 96125e924450fcb23c11c07c95ea8964dd9f174652eDavid Jander ®s->cantxfg[FLEXCAN_TX_BUF_RESERVED].can_ctrl); 96225e924450fcb23c11c07c95ea8964dd9f174652eDavid Jander 963c32fe4ad3e4861b2bfa1f44114c564935a123ddaMarc Kleine-Budde /* mark TX mailbox as INACTIVE */ 964c32fe4ad3e4861b2bfa1f44114c564935a123ddaMarc Kleine-Budde flexcan_write(FLEXCAN_MB_CODE_TX_INACTIVE, 965d5a7b406c529e4595ce03dc8f6dcf7fa36f106faMarc Kleine-Budde ®s->cantxfg[FLEXCAN_TX_BUF_ID].can_ctrl); 966d5a7b406c529e4595ce03dc8f6dcf7fa36f106faMarc Kleine-Budde 967e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* acceptance mask/acceptance code (accept everything) */ 96861e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(0x0, ®s->rxgmask); 96961e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(0x0, ®s->rx14mask); 97061e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(0x0, ®s->rx15mask); 971e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 9724f72e5f00dea3eca9139a23cf70fbf18d62fd1dbWolfgang Grandegger if (priv->devtype_data->features & FLEXCAN_HAS_V10_FEATURES) 97330c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang flexcan_write(0x0, ®s->rxfgmask); 97430c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang 975cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner /* 976cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner * On Vybrid, disable memory error detection interrupts 977cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner * and freeze mode. 978cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner * This also works around errata e5295 which generates 979cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner * false positive memory errors and put the device in 980cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner * freeze mode. 981cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner */ 982cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner if (priv->devtype_data->features & FLEXCAN_HAS_MECR_FEATURES) { 983cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner /* 984cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner * Follow the protocol as described in "Detection 985cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner * and Correction of Memory Errors" to write to 986cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner * MECR register 987cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner */ 988cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner reg_crl2 = flexcan_read(®s->crl2); 989cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner reg_crl2 |= FLEXCAN_CRL2_ECRWRE; 990cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner flexcan_write(reg_crl2, ®s->crl2); 991cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner 992cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner reg_mecr = flexcan_read(®s->mecr); 993cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner reg_mecr &= ~FLEXCAN_MECR_ECRWRDIS; 994cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner flexcan_write(reg_mecr, ®s->mecr); 995cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner reg_mecr &= ~(FLEXCAN_MECR_NCEFAFRZ | FLEXCAN_MECR_HANCEI_MSK | 996cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner FLEXCAN_MECR_FANCEI_MSK); 997cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner flexcan_write(reg_mecr, ®s->mecr); 998cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner } 999cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner 1000f003698e23f6f56a791774f14d0ac35d04872490Marc Kleine-Budde err = flexcan_transceiver_enable(priv); 1001f003698e23f6f56a791774f14d0ac35d04872490Marc Kleine-Budde if (err) 1002b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde goto out_chip_disable; 1003e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1004e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* synchronize with the can bus */ 1005b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde err = flexcan_chip_unfreeze(priv); 1006b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde if (err) 1007b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde goto out_transceiver_disable; 1008e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1009e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->can.state = CAN_STATE_ERROR_ACTIVE; 1010e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1011e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* enable FIFO interrupts */ 101261e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(FLEXCAN_IFLAG_DEFAULT, ®s->imask1); 1013e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1014e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* print chip status */ 1015aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_dbg(dev, "%s: reading mcr=0x%08x ctrl=0x%08x\n", __func__, 1016aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger flexcan_read(®s->mcr), flexcan_read(®s->ctrl)); 1017e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1018e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 1019e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1020b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde out_transceiver_disable: 1021b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde flexcan_transceiver_disable(priv); 1022b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde out_chip_disable: 1023e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flexcan_chip_disable(priv); 1024e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return err; 1025e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 1026e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1027e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde/* 1028e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * flexcan_chip_stop 1029e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 1030e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * this functions is entered with clocks enabled 1031e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * 1032e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 1033e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic void flexcan_chip_stop(struct net_device *dev) 1034e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 1035e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv = netdev_priv(dev); 1036e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 1037e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1038b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde /* freeze + disable module */ 1039b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde flexcan_chip_freeze(priv); 1040b1aa1c7a2165b44ecce66286a3095cc6c7667d1cMarc Kleine-Budde flexcan_chip_disable(priv); 1041e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 10425be93bdda64e85450598c6e97f79fb8f6acf30e0Marc Kleine-Budde /* Disable all interrupts */ 10435be93bdda64e85450598c6e97f79fb8f6acf30e0Marc Kleine-Budde flexcan_write(0, ®s->imask1); 10445be93bdda64e85450598c6e97f79fb8f6acf30e0Marc Kleine-Budde flexcan_write(priv->reg_ctrl_default & ~FLEXCAN_CTRL_ERR_ALL, 10455be93bdda64e85450598c6e97f79fb8f6acf30e0Marc Kleine-Budde ®s->ctrl); 10465be93bdda64e85450598c6e97f79fb8f6acf30e0Marc Kleine-Budde 1047f003698e23f6f56a791774f14d0ac35d04872490Marc Kleine-Budde flexcan_transceiver_disable(priv); 1048e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->can.state = CAN_STATE_STOPPED; 1049e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1050e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return; 1051e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 1052e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1053e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int flexcan_open(struct net_device *dev) 1054e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 1055e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv = netdev_priv(dev); 1056e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde int err; 1057e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1058aa10181bdac99a623517f0f2bfa14cd98c749246Fabio Estevam err = clk_prepare_enable(priv->clk_ipg); 1059aa10181bdac99a623517f0f2bfa14cd98c749246Fabio Estevam if (err) 1060aa10181bdac99a623517f0f2bfa14cd98c749246Fabio Estevam return err; 1061aa10181bdac99a623517f0f2bfa14cd98c749246Fabio Estevam 1062aa10181bdac99a623517f0f2bfa14cd98c749246Fabio Estevam err = clk_prepare_enable(priv->clk_per); 1063aa10181bdac99a623517f0f2bfa14cd98c749246Fabio Estevam if (err) 1064aa10181bdac99a623517f0f2bfa14cd98c749246Fabio Estevam goto out_disable_ipg; 1065e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1066e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = open_candev(dev); 1067e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (err) 1068aa10181bdac99a623517f0f2bfa14cd98c749246Fabio Estevam goto out_disable_per; 1069e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1070e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = request_irq(dev->irq, flexcan_irq, IRQF_SHARED, dev->name, dev); 1071e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (err) 1072e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde goto out_close; 1073e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1074e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* start chip and queuing */ 1075e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = flexcan_chip_start(dev); 1076e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (err) 10777e9e148af01ef388efb6e2490805970be4622792Marc Kleine-Budde goto out_free_irq; 1078adccadb92f0571fd0f9b2ac8011057a7de9e3e63Fabio Baltieri 1079adccadb92f0571fd0f9b2ac8011057a7de9e3e63Fabio Baltieri can_led_event(dev, CAN_LED_EVENT_OPEN); 1080adccadb92f0571fd0f9b2ac8011057a7de9e3e63Fabio Baltieri 1081e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde napi_enable(&priv->napi); 1082e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde netif_start_queue(dev); 1083e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1084e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 1085e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 10867e9e148af01ef388efb6e2490805970be4622792Marc Kleine-Budde out_free_irq: 10877e9e148af01ef388efb6e2490805970be4622792Marc Kleine-Budde free_irq(dev->irq, dev); 1088e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde out_close: 1089e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde close_candev(dev); 1090aa10181bdac99a623517f0f2bfa14cd98c749246Fabio Estevam out_disable_per: 10913d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar clk_disable_unprepare(priv->clk_per); 1092aa10181bdac99a623517f0f2bfa14cd98c749246Fabio Estevam out_disable_ipg: 10933d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar clk_disable_unprepare(priv->clk_ipg); 1094e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1095e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return err; 1096e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 1097e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1098e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int flexcan_close(struct net_device *dev) 1099e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 1100e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv = netdev_priv(dev); 1101e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1102e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde netif_stop_queue(dev); 1103e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde napi_disable(&priv->napi); 1104e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flexcan_chip_stop(dev); 1105e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1106e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde free_irq(dev->irq, dev); 11073d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar clk_disable_unprepare(priv->clk_per); 11083d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar clk_disable_unprepare(priv->clk_ipg); 1109e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1110e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde close_candev(dev); 1111e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1112adccadb92f0571fd0f9b2ac8011057a7de9e3e63Fabio Baltieri can_led_event(dev, CAN_LED_EVENT_STOP); 1113adccadb92f0571fd0f9b2ac8011057a7de9e3e63Fabio Baltieri 1114e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 1115e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 1116e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1117e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic int flexcan_set_mode(struct net_device *dev, enum can_mode mode) 1118e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 1119e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde int err; 1120e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1121e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde switch (mode) { 1122e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde case CAN_MODE_START: 1123e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = flexcan_chip_start(dev); 1124e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (err) 1125e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return err; 1126e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1127e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde netif_wake_queue(dev); 1128e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde break; 1129e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1130e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde default: 1131e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return -EOPNOTSUPP; 1132e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 1133e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1134e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 1135e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 1136e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1137e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic const struct net_device_ops flexcan_netdev_ops = { 1138e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .ndo_open = flexcan_open, 1139e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .ndo_stop = flexcan_close, 1140e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .ndo_start_xmit = flexcan_start_xmit, 1141c971fa2ae42e73e9ccc2f5e93f268c8742da4c5dOliver Hartkopp .ndo_change_mtu = can_change_mtu, 1142e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde}; 1143e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 11443c8ac0f2ad53a96ac58efe7c98fac2986d081dfcBill Pembertonstatic int register_flexcandev(struct net_device *dev) 1145e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 1146e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv = netdev_priv(dev); 1147e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_regs __iomem *regs = priv->base; 1148e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde u32 reg, err; 1149e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1150aa10181bdac99a623517f0f2bfa14cd98c749246Fabio Estevam err = clk_prepare_enable(priv->clk_ipg); 1151aa10181bdac99a623517f0f2bfa14cd98c749246Fabio Estevam if (err) 1152aa10181bdac99a623517f0f2bfa14cd98c749246Fabio Estevam return err; 1153aa10181bdac99a623517f0f2bfa14cd98c749246Fabio Estevam 1154aa10181bdac99a623517f0f2bfa14cd98c749246Fabio Estevam err = clk_prepare_enable(priv->clk_per); 1155aa10181bdac99a623517f0f2bfa14cd98c749246Fabio Estevam if (err) 1156aa10181bdac99a623517f0f2bfa14cd98c749246Fabio Estevam goto out_disable_ipg; 1157e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1158e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* select "bus clock", chip must be disabled */ 11599b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde err = flexcan_chip_disable(priv); 11609b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde if (err) 11619b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde goto out_disable_per; 116261e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg = flexcan_read(®s->ctrl); 1163e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg |= FLEXCAN_CTRL_CLK_SRC; 116461e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(reg, ®s->ctrl); 1165e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 11669b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde err = flexcan_chip_enable(priv); 11679b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde if (err) 11689b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde goto out_chip_disable; 1169e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1170e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* set freeze, halt and activate FIFO, restrict register access */ 117161e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg = flexcan_read(®s->mcr); 1172e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde reg |= FLEXCAN_MCR_FRZ | FLEXCAN_MCR_HALT | 1173e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde FLEXCAN_MCR_FEN | FLEXCAN_MCR_SUPV; 117461e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com flexcan_write(reg, ®s->mcr); 1175e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1176e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* 1177e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * Currently we only support newer versions of this core 1178e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * featuring a RX FIFO. Older cores found on some Coldfire 1179e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde * derivates are not yet supported. 1180e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde */ 118161e271ee64f1da6f69e56419ecf2ca7330884564holt@sgi.com reg = flexcan_read(®s->mcr); 1182e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (!(reg & FLEXCAN_MCR_FEN)) { 1183aabdfd6adb804d0aaba0188ade0f1afe42a52e31Wolfgang Grandegger netdev_err(dev, "Could not enable RX FIFO, unsupported core\n"); 1184e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = -ENODEV; 11859b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde goto out_chip_disable; 1186e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 1187e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1188e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = register_candev(dev); 1189e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1190e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde /* disable core and turn off clocks */ 11919b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde out_chip_disable: 1192e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde flexcan_chip_disable(priv); 11939b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde out_disable_per: 11943d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar clk_disable_unprepare(priv->clk_per); 1195aa10181bdac99a623517f0f2bfa14cd98c749246Fabio Estevam out_disable_ipg: 11963d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar clk_disable_unprepare(priv->clk_ipg); 1197e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1198e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return err; 1199e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 1200e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 12013c8ac0f2ad53a96ac58efe7c98fac2986d081dfcBill Pembertonstatic void unregister_flexcandev(struct net_device *dev) 1202e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 1203e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde unregister_candev(dev); 1204e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 1205e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 120630c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wangstatic const struct of_device_id flexcan_of_match[] = { 120730c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang { .compatible = "fsl,imx6q-flexcan", .data = &fsl_imx6q_devtype_data, }, 1208e358784297992b012e8071764d996191dd2b1a54Marc Kleine-Budde { .compatible = "fsl,imx28-flexcan", .data = &fsl_imx28_devtype_data, }, 1209e358784297992b012e8071764d996191dd2b1a54Marc Kleine-Budde { .compatible = "fsl,p1010-flexcan", .data = &fsl_p1010_devtype_data, }, 1210cdce844865bea6869b34bacc98af3711774f5bb5Stefan Agner { .compatible = "fsl,vf610-flexcan", .data = &fsl_vf610_devtype_data, }, 121130c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang { /* sentinel */ }, 121230c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang}; 12134358a9dc94cd70fa88797c87ed911bc8d866f37dMarc Kleine-BuddeMODULE_DEVICE_TABLE(of, flexcan_of_match); 121430c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang 121530c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wangstatic const struct platform_device_id flexcan_id_table[] = { 121630c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang { .name = "flexcan", .driver_data = (kernel_ulong_t)&fsl_p1010_devtype_data, }, 121730c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang { /* sentinel */ }, 121830c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang}; 12194358a9dc94cd70fa88797c87ed911bc8d866f37dMarc Kleine-BuddeMODULE_DEVICE_TABLE(platform, flexcan_id_table); 122030c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang 12213c8ac0f2ad53a96ac58efe7c98fac2986d081dfcBill Pembertonstatic int flexcan_probe(struct platform_device *pdev) 1222e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 122330c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang const struct of_device_id *of_id; 1224dda0b3bd1cbb66ee869d589f7d719f703d7c38a1Marc Kleine-Budde const struct flexcan_devtype_data *devtype_data; 1225e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct net_device *dev; 1226e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct flexcan_priv *priv; 1227e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct resource *mem; 12283d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar struct clk *clk_ipg = NULL, *clk_per = NULL; 1229e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde void __iomem *base; 1230e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde int err, irq; 123197efe9aef1ae8922666d32f28d712745a86859e9holt@sgi.com u32 clock_freq = 0; 123297efe9aef1ae8922666d32f28d712745a86859e9holt@sgi.com 1233afc016d8360ceb19a1f37bf6579d5850d47d582dHui Wang if (pdev->dev.of_node) 1234afc016d8360ceb19a1f37bf6579d5850d47d582dHui Wang of_property_read_u32(pdev->dev.of_node, 1235afc016d8360ceb19a1f37bf6579d5850d47d582dHui Wang "clock-frequency", &clock_freq); 123697efe9aef1ae8922666d32f28d712745a86859e9holt@sgi.com 123797efe9aef1ae8922666d32f28d712745a86859e9holt@sgi.com if (!clock_freq) { 12383d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar clk_ipg = devm_clk_get(&pdev->dev, "ipg"); 12393d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar if (IS_ERR(clk_ipg)) { 12403d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar dev_err(&pdev->dev, "no ipg clock defined\n"); 1241933e4af4c590c63509ffadeb77fcd1d329ac9155Fabio Estevam return PTR_ERR(clk_ipg); 12423d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar } 12433d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar 12443d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar clk_per = devm_clk_get(&pdev->dev, "per"); 12453d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar if (IS_ERR(clk_per)) { 12463d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar dev_err(&pdev->dev, "no per clock defined\n"); 1247933e4af4c590c63509ffadeb77fcd1d329ac9155Fabio Estevam return PTR_ERR(clk_per); 124897efe9aef1ae8922666d32f28d712745a86859e9holt@sgi.com } 12491a3e5173f5e72cbf7f0c8927b33082e361c16d72Marc Kleine-Budde clock_freq = clk_get_rate(clk_per); 1250e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 1251e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1252e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1253e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde irq = platform_get_irq(pdev, 0); 1254933e4af4c590c63509ffadeb77fcd1d329ac9155Fabio Estevam if (irq <= 0) 1255933e4af4c590c63509ffadeb77fcd1d329ac9155Fabio Estevam return -ENODEV; 1256e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1257933e4af4c590c63509ffadeb77fcd1d329ac9155Fabio Estevam base = devm_ioremap_resource(&pdev->dev, mem); 1258933e4af4c590c63509ffadeb77fcd1d329ac9155Fabio Estevam if (IS_ERR(base)) 1259933e4af4c590c63509ffadeb77fcd1d329ac9155Fabio Estevam return PTR_ERR(base); 1260e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 126130c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang of_id = of_match_device(flexcan_of_match, &pdev->dev); 126230c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang if (of_id) { 126330c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang devtype_data = of_id->data; 1264d0873e6fc06686cf2dfb9adabb6ca65e9967c60fMarc Kleine-Budde } else if (platform_get_device_id(pdev)->driver_data) { 126530c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang devtype_data = (struct flexcan_devtype_data *) 1266d0873e6fc06686cf2dfb9adabb6ca65e9967c60fMarc Kleine-Budde platform_get_device_id(pdev)->driver_data; 126730c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang } else { 1268933e4af4c590c63509ffadeb77fcd1d329ac9155Fabio Estevam return -ENODEV; 126930c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang } 127030c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang 1271933e4af4c590c63509ffadeb77fcd1d329ac9155Fabio Estevam dev = alloc_candev(sizeof(struct flexcan_priv), 1); 1272933e4af4c590c63509ffadeb77fcd1d329ac9155Fabio Estevam if (!dev) 1273933e4af4c590c63509ffadeb77fcd1d329ac9155Fabio Estevam return -ENOMEM; 1274933e4af4c590c63509ffadeb77fcd1d329ac9155Fabio Estevam 1275e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev->netdev_ops = &flexcan_netdev_ops; 1276e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev->irq = irq; 12779a12349663061d25b49e6542d005fa7193a2cb44Reuben Dowle dev->flags |= IFF_ECHO; 1278e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1279e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv = netdev_priv(dev); 128097efe9aef1ae8922666d32f28d712745a86859e9holt@sgi.com priv->can.clock.freq = clock_freq; 1281e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->can.bittiming_const = &flexcan_bittiming_const; 1282e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->can.do_set_mode = flexcan_set_mode; 1283e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->can.do_get_berr_counter = flexcan_get_berr_counter; 1284e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK | 1285e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde CAN_CTRLMODE_LISTENONLY | CAN_CTRLMODE_3_SAMPLES | 1286e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde CAN_CTRLMODE_BERR_REPORTING; 1287e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->base = base; 1288e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->dev = dev; 12893d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar priv->clk_ipg = clk_ipg; 12903d42a379b6fa5b46058e3302b1802b29f64865bbSteffen Trumtrar priv->clk_per = clk_per; 129184ae6643d8bd2d6c9a4e313212bfe68e0abcab3fJingoo Han priv->pdata = dev_get_platdata(&pdev->dev); 129230c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang priv->devtype_data = devtype_data; 1293e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1294b7c4114b07bbacfe0aee1d04ad1ade9e42309620Fabio Estevam priv->reg_xceiver = devm_regulator_get(&pdev->dev, "xceiver"); 1295b7c4114b07bbacfe0aee1d04ad1ade9e42309620Fabio Estevam if (IS_ERR(priv->reg_xceiver)) 1296b7c4114b07bbacfe0aee1d04ad1ade9e42309620Fabio Estevam priv->reg_xceiver = NULL; 1297b7c4114b07bbacfe0aee1d04ad1ade9e42309620Fabio Estevam 1298e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde netif_napi_add(dev, &priv->napi, flexcan_poll, FLEXCAN_NAPI_WEIGHT); 1299e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1300d75ea942b360690a380da8012a51eaf6a6ebb1b1Libo Chen platform_set_drvdata(pdev, dev); 1301e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde SET_NETDEV_DEV(dev, &pdev->dev); 1302e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1303e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde err = register_flexcandev(dev); 1304e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde if (err) { 1305e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev_err(&pdev->dev, "registering netdev failed\n"); 1306e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde goto failed_register; 1307e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde } 1308e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1309adccadb92f0571fd0f9b2ac8011057a7de9e3e63Fabio Baltieri devm_can_led_init(dev); 1310adccadb92f0571fd0f9b2ac8011057a7de9e3e63Fabio Baltieri 1311e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde dev_info(&pdev->dev, "device registered (reg_base=%p, irq=%d)\n", 1312e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde priv->base, dev->irq); 1313e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1314e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 1315e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1316e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde failed_register: 1317e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde free_candev(dev); 1318e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return err; 1319e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 1320e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 13213c8ac0f2ad53a96ac58efe7c98fac2986d081dfcBill Pembertonstatic int flexcan_remove(struct platform_device *pdev) 1322e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde{ 1323e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde struct net_device *dev = platform_get_drvdata(pdev); 1324d96e43e8fce28cf97df576a07af9d65657a41a6fMarc Kleine-Budde struct flexcan_priv *priv = netdev_priv(dev); 1325e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1326e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde unregister_flexcandev(dev); 1327d96e43e8fce28cf97df576a07af9d65657a41a6fMarc Kleine-Budde netif_napi_del(&priv->napi); 13289a27586d3d5c3157260b055d057c6f4f6654c72cMarc Kleine-Budde free_candev(dev); 13299a27586d3d5c3157260b055d057c6f4f6654c72cMarc Kleine-Budde 1330e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde return 0; 1331e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde} 1332e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 133308c6d35154069becb01243176fb72b3bc60ff3cbMarc Kleine-Buddestatic int __maybe_unused flexcan_suspend(struct device *device) 13348b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard{ 1335588e7a8e123da07b6ffe87f156e25afc1c3d7cceFabio Estevam struct net_device *dev = dev_get_drvdata(device); 13368b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard struct flexcan_priv *priv = netdev_priv(dev); 13379b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde int err; 13388b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard 13399b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde err = flexcan_chip_disable(priv); 13409b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde if (err) 13419b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde return err; 13428b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard 13438b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard if (netif_running(dev)) { 13448b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard netif_stop_queue(dev); 13458b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard netif_device_detach(dev); 13468b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard } 13478b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard priv->can.state = CAN_STATE_SLEEPING; 13488b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard 13498b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard return 0; 13508b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard} 13518b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard 135208c6d35154069becb01243176fb72b3bc60ff3cbMarc Kleine-Buddestatic int __maybe_unused flexcan_resume(struct device *device) 13538b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard{ 1354588e7a8e123da07b6ffe87f156e25afc1c3d7cceFabio Estevam struct net_device *dev = dev_get_drvdata(device); 13558b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard struct flexcan_priv *priv = netdev_priv(dev); 13568b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard 13578b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard priv->can.state = CAN_STATE_ERROR_ACTIVE; 13588b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard if (netif_running(dev)) { 13598b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard netif_device_attach(dev); 13608b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard netif_start_queue(dev); 13618b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard } 13629b00b300e7bce032c467c36ca47fe2a776887fc2Marc Kleine-Budde return flexcan_chip_enable(priv); 13638b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard} 1364588e7a8e123da07b6ffe87f156e25afc1c3d7cceFabio Estevam 1365588e7a8e123da07b6ffe87f156e25afc1c3d7cceFabio Estevamstatic SIMPLE_DEV_PM_OPS(flexcan_pm_ops, flexcan_suspend, flexcan_resume); 13668b5e218d8caa7592d26e68157bd71f50426bb7aeEric Bénard 1367e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Buddestatic struct platform_driver flexcan_driver = { 1368c8aef4cb788b760331e6df06a5d93389824882b4holt@sgi.com .driver = { 1369c8aef4cb788b760331e6df06a5d93389824882b4holt@sgi.com .name = DRV_NAME, 1370c8aef4cb788b760331e6df06a5d93389824882b4holt@sgi.com .owner = THIS_MODULE, 1371588e7a8e123da07b6ffe87f156e25afc1c3d7cceFabio Estevam .pm = &flexcan_pm_ops, 1372c8aef4cb788b760331e6df06a5d93389824882b4holt@sgi.com .of_match_table = flexcan_of_match, 1373c8aef4cb788b760331e6df06a5d93389824882b4holt@sgi.com }, 1374e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde .probe = flexcan_probe, 13753c8ac0f2ad53a96ac58efe7c98fac2986d081dfcBill Pemberton .remove = flexcan_remove, 137630c1e672044d98e5c4cff5fcbdb34b55a2df0c0fHui Wang .id_table = flexcan_id_table, 1377e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde}; 1378e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1379871d33725545ca2e402b4526f38f89d041ba930fAxel Linmodule_platform_driver(flexcan_driver); 1380e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde 1381e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-BuddeMODULE_AUTHOR("Sascha Hauer <kernel@pengutronix.de>, " 1382e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-Budde "Marc Kleine-Budde <kernel@pengutronix.de>"); 1383e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-BuddeMODULE_LICENSE("GPL v2"); 1384e955cead031177b083fbf18d04a03c06e330a439Marc Kleine-BuddeMODULE_DESCRIPTION("CAN port driver for flexcan based chip"); 1385