1// SPDX-License-Identifier: GPL-2.0
   2//
   3// flexcan.c - FLEXCAN CAN controller driver
   4//
   5// Copyright (c) 2005-2006 Varma Electronics Oy
   6// Copyright (c) 2009 Sascha Hauer, Pengutronix
   7// Copyright (c) 2010-2017 Pengutronix, Marc Kleine-Budde <kernel@pengutronix.de>
   8// Copyright (c) 2014 David Jander, Protonic Holland
   9//
  10// Based on code originally by Andrey Volkov <avolkov@varma-el.com>
  11
  12#include <dt-bindings/firmware/imx/rsrc.h>
  13#include <linux/bitfield.h>
  14#include <linux/can.h>
  15#include <linux/can/dev.h>
  16#include <linux/can/error.h>
  17#include <linux/clk.h>
  18#include <linux/delay.h>
  19#include <linux/firmware/imx/sci.h>
  20#include <linux/interrupt.h>
  21#include <linux/io.h>
  22#include <linux/mfd/syscon.h>
  23#include <linux/module.h>
  24#include <linux/netdevice.h>
  25#include <linux/of.h>
 
  26#include <linux/pinctrl/consumer.h>
  27#include <linux/platform_device.h>
  28#include <linux/can/platform/flexcan.h>
  29#include <linux/pm_runtime.h>
  30#include <linux/property.h>
  31#include <linux/regmap.h>
  32#include <linux/regulator/consumer.h>
  33
  34#include "flexcan.h"
  35
  36#define DRV_NAME			"flexcan"
  37
  38/* 8 for RX fifo and 2 error handling */
  39#define FLEXCAN_NAPI_WEIGHT		(8 + 2)
  40
  41/* FLEXCAN module configuration register (CANMCR) bits */
  42#define FLEXCAN_MCR_MDIS		BIT(31)
  43#define FLEXCAN_MCR_FRZ			BIT(30)
  44#define FLEXCAN_MCR_FEN			BIT(29)
  45#define FLEXCAN_MCR_HALT		BIT(28)
  46#define FLEXCAN_MCR_NOT_RDY		BIT(27)
  47#define FLEXCAN_MCR_WAK_MSK		BIT(26)
  48#define FLEXCAN_MCR_SOFTRST		BIT(25)
  49#define FLEXCAN_MCR_FRZ_ACK		BIT(24)
  50#define FLEXCAN_MCR_SUPV		BIT(23)
  51#define FLEXCAN_MCR_SLF_WAK		BIT(22)
  52#define FLEXCAN_MCR_WRN_EN		BIT(21)
  53#define FLEXCAN_MCR_LPM_ACK		BIT(20)
  54#define FLEXCAN_MCR_WAK_SRC		BIT(19)
  55#define FLEXCAN_MCR_DOZE		BIT(18)
  56#define FLEXCAN_MCR_SRX_DIS		BIT(17)
  57#define FLEXCAN_MCR_IRMQ		BIT(16)
  58#define FLEXCAN_MCR_LPRIO_EN		BIT(13)
  59#define FLEXCAN_MCR_AEN			BIT(12)
  60#define FLEXCAN_MCR_FDEN		BIT(11)
  61/* MCR_MAXMB: maximum used MBs is MAXMB + 1 */
  62#define FLEXCAN_MCR_MAXMB(x)		((x) & 0x7f)
  63#define FLEXCAN_MCR_IDAM_A		(0x0 << 8)
  64#define FLEXCAN_MCR_IDAM_B		(0x1 << 8)
  65#define FLEXCAN_MCR_IDAM_C		(0x2 << 8)
  66#define FLEXCAN_MCR_IDAM_D		(0x3 << 8)
  67
  68/* FLEXCAN control register (CANCTRL) bits */
  69#define FLEXCAN_CTRL_PRESDIV(x)		(((x) & 0xff) << 24)
  70#define FLEXCAN_CTRL_RJW(x)		(((x) & 0x03) << 22)
  71#define FLEXCAN_CTRL_PSEG1(x)		(((x) & 0x07) << 19)
  72#define FLEXCAN_CTRL_PSEG2(x)		(((x) & 0x07) << 16)
  73#define FLEXCAN_CTRL_BOFF_MSK		BIT(15)
  74#define FLEXCAN_CTRL_ERR_MSK		BIT(14)
  75#define FLEXCAN_CTRL_CLK_SRC		BIT(13)
  76#define FLEXCAN_CTRL_LPB		BIT(12)
  77#define FLEXCAN_CTRL_TWRN_MSK		BIT(11)
  78#define FLEXCAN_CTRL_RWRN_MSK		BIT(10)
  79#define FLEXCAN_CTRL_SMP		BIT(7)
  80#define FLEXCAN_CTRL_BOFF_REC		BIT(6)
  81#define FLEXCAN_CTRL_TSYN		BIT(5)
  82#define FLEXCAN_CTRL_LBUF		BIT(4)
  83#define FLEXCAN_CTRL_LOM		BIT(3)
  84#define FLEXCAN_CTRL_PROPSEG(x)		((x) & 0x07)
  85#define FLEXCAN_CTRL_ERR_BUS		(FLEXCAN_CTRL_ERR_MSK)
  86#define FLEXCAN_CTRL_ERR_STATE \
  87	(FLEXCAN_CTRL_TWRN_MSK | FLEXCAN_CTRL_RWRN_MSK | \
  88	 FLEXCAN_CTRL_BOFF_MSK)
  89#define FLEXCAN_CTRL_ERR_ALL \
  90	(FLEXCAN_CTRL_ERR_BUS | FLEXCAN_CTRL_ERR_STATE)
  91
  92/* FLEXCAN control register 2 (CTRL2) bits */
  93#define FLEXCAN_CTRL2_ECRWRE		BIT(29)
  94#define FLEXCAN_CTRL2_WRMFRZ		BIT(28)
  95#define FLEXCAN_CTRL2_RFFN(x)		(((x) & 0x0f) << 24)
  96#define FLEXCAN_CTRL2_TASD(x)		(((x) & 0x1f) << 19)
  97#define FLEXCAN_CTRL2_MRP		BIT(18)
  98#define FLEXCAN_CTRL2_RRS		BIT(17)
  99#define FLEXCAN_CTRL2_EACEN		BIT(16)
 100#define FLEXCAN_CTRL2_ISOCANFDEN	BIT(12)
 101
 102/* FLEXCAN memory error control register (MECR) bits */
 103#define FLEXCAN_MECR_ECRWRDIS		BIT(31)
 104#define FLEXCAN_MECR_HANCEI_MSK		BIT(19)
 105#define FLEXCAN_MECR_FANCEI_MSK		BIT(18)
 106#define FLEXCAN_MECR_CEI_MSK		BIT(16)
 107#define FLEXCAN_MECR_HAERRIE		BIT(15)
 108#define FLEXCAN_MECR_FAERRIE		BIT(14)
 109#define FLEXCAN_MECR_EXTERRIE		BIT(13)
 110#define FLEXCAN_MECR_RERRDIS		BIT(9)
 111#define FLEXCAN_MECR_ECCDIS		BIT(8)
 112#define FLEXCAN_MECR_NCEFAFRZ		BIT(7)
 113
 114/* FLEXCAN error and status register (ESR) bits */
 115#define FLEXCAN_ESR_TWRN_INT		BIT(17)
 116#define FLEXCAN_ESR_RWRN_INT		BIT(16)
 117#define FLEXCAN_ESR_BIT1_ERR		BIT(15)
 118#define FLEXCAN_ESR_BIT0_ERR		BIT(14)
 119#define FLEXCAN_ESR_ACK_ERR		BIT(13)
 120#define FLEXCAN_ESR_CRC_ERR		BIT(12)
 121#define FLEXCAN_ESR_FRM_ERR		BIT(11)
 122#define FLEXCAN_ESR_STF_ERR		BIT(10)
 123#define FLEXCAN_ESR_TX_WRN		BIT(9)
 124#define FLEXCAN_ESR_RX_WRN		BIT(8)
 125#define FLEXCAN_ESR_IDLE		BIT(7)
 126#define FLEXCAN_ESR_TXRX		BIT(6)
 127#define FLEXCAN_EST_FLT_CONF_SHIFT	(4)
 128#define FLEXCAN_ESR_FLT_CONF_MASK	(0x3 << FLEXCAN_EST_FLT_CONF_SHIFT)
 129#define FLEXCAN_ESR_FLT_CONF_ACTIVE	(0x0 << FLEXCAN_EST_FLT_CONF_SHIFT)
 130#define FLEXCAN_ESR_FLT_CONF_PASSIVE	(0x1 << FLEXCAN_EST_FLT_CONF_SHIFT)
 131#define FLEXCAN_ESR_BOFF_INT		BIT(2)
 132#define FLEXCAN_ESR_ERR_INT		BIT(1)
 133#define FLEXCAN_ESR_WAK_INT		BIT(0)
 134#define FLEXCAN_ESR_ERR_BUS \
 135	(FLEXCAN_ESR_BIT1_ERR | FLEXCAN_ESR_BIT0_ERR | \
 136	 FLEXCAN_ESR_ACK_ERR | FLEXCAN_ESR_CRC_ERR | \
 137	 FLEXCAN_ESR_FRM_ERR | FLEXCAN_ESR_STF_ERR)
 138#define FLEXCAN_ESR_ERR_STATE \
 139	(FLEXCAN_ESR_TWRN_INT | FLEXCAN_ESR_RWRN_INT | FLEXCAN_ESR_BOFF_INT)
 140#define FLEXCAN_ESR_ERR_ALL \
 141	(FLEXCAN_ESR_ERR_BUS | FLEXCAN_ESR_ERR_STATE)
 142#define FLEXCAN_ESR_ALL_INT \
 143	(FLEXCAN_ESR_TWRN_INT | FLEXCAN_ESR_RWRN_INT | \
 144	 FLEXCAN_ESR_BOFF_INT | FLEXCAN_ESR_ERR_INT)
 145
 146/* FLEXCAN Bit Timing register (CBT) bits */
 147#define FLEXCAN_CBT_BTF			BIT(31)
 148#define FLEXCAN_CBT_EPRESDIV_MASK	GENMASK(30, 21)
 149#define FLEXCAN_CBT_ERJW_MASK		GENMASK(20, 16)
 150#define FLEXCAN_CBT_EPROPSEG_MASK	GENMASK(15, 10)
 151#define FLEXCAN_CBT_EPSEG1_MASK		GENMASK(9, 5)
 152#define FLEXCAN_CBT_EPSEG2_MASK		GENMASK(4, 0)
 153
 154/* FLEXCAN FD control register (FDCTRL) bits */
 155#define FLEXCAN_FDCTRL_FDRATE		BIT(31)
 156#define FLEXCAN_FDCTRL_MBDSR1		GENMASK(20, 19)
 157#define FLEXCAN_FDCTRL_MBDSR0		GENMASK(17, 16)
 158#define FLEXCAN_FDCTRL_MBDSR_8		0x0
 159#define FLEXCAN_FDCTRL_MBDSR_12		0x1
 160#define FLEXCAN_FDCTRL_MBDSR_32		0x2
 161#define FLEXCAN_FDCTRL_MBDSR_64		0x3
 162#define FLEXCAN_FDCTRL_TDCEN		BIT(15)
 163#define FLEXCAN_FDCTRL_TDCFAIL		BIT(14)
 164#define FLEXCAN_FDCTRL_TDCOFF		GENMASK(12, 8)
 165#define FLEXCAN_FDCTRL_TDCVAL		GENMASK(5, 0)
 166
 167/* FLEXCAN FD Bit Timing register (FDCBT) bits */
 168#define FLEXCAN_FDCBT_FPRESDIV_MASK	GENMASK(29, 20)
 169#define FLEXCAN_FDCBT_FRJW_MASK		GENMASK(18, 16)
 170#define FLEXCAN_FDCBT_FPROPSEG_MASK	GENMASK(14, 10)
 171#define FLEXCAN_FDCBT_FPSEG1_MASK	GENMASK(7, 5)
 172#define FLEXCAN_FDCBT_FPSEG2_MASK	GENMASK(2, 0)
 173
 174/* FLEXCAN interrupt flag register (IFLAG) bits */
 175/* Errata ERR005829 step7: Reserve first valid MB */
 176#define FLEXCAN_TX_MB_RESERVED_RX_FIFO	8
 177#define FLEXCAN_TX_MB_RESERVED_RX_MAILBOX	0
 178#define FLEXCAN_RX_MB_RX_MAILBOX_FIRST	(FLEXCAN_TX_MB_RESERVED_RX_MAILBOX + 1)
 179#define FLEXCAN_IFLAG_MB(x)		BIT_ULL(x)
 180#define FLEXCAN_IFLAG_RX_FIFO_OVERFLOW	BIT(7)
 181#define FLEXCAN_IFLAG_RX_FIFO_WARN	BIT(6)
 182#define FLEXCAN_IFLAG_RX_FIFO_AVAILABLE	BIT(5)
 183
 184/* FLEXCAN message buffers */
 185#define FLEXCAN_MB_CODE_MASK		(0xf << 24)
 186#define FLEXCAN_MB_CODE_RX_BUSY_BIT	(0x1 << 24)
 187#define FLEXCAN_MB_CODE_RX_INACTIVE	(0x0 << 24)
 188#define FLEXCAN_MB_CODE_RX_EMPTY	(0x4 << 24)
 189#define FLEXCAN_MB_CODE_RX_FULL		(0x2 << 24)
 190#define FLEXCAN_MB_CODE_RX_OVERRUN	(0x6 << 24)
 191#define FLEXCAN_MB_CODE_RX_RANSWER	(0xa << 24)
 192
 193#define FLEXCAN_MB_CODE_TX_INACTIVE	(0x8 << 24)
 194#define FLEXCAN_MB_CODE_TX_ABORT	(0x9 << 24)
 195#define FLEXCAN_MB_CODE_TX_DATA		(0xc << 24)
 196#define FLEXCAN_MB_CODE_TX_TANSWER	(0xe << 24)
 197
 198#define FLEXCAN_MB_CNT_EDL		BIT(31)
 199#define FLEXCAN_MB_CNT_BRS		BIT(30)
 200#define FLEXCAN_MB_CNT_ESI		BIT(29)
 201#define FLEXCAN_MB_CNT_SRR		BIT(22)
 202#define FLEXCAN_MB_CNT_IDE		BIT(21)
 203#define FLEXCAN_MB_CNT_RTR		BIT(20)
 204#define FLEXCAN_MB_CNT_LENGTH(x)	(((x) & 0xf) << 16)
 205#define FLEXCAN_MB_CNT_TIMESTAMP(x)	((x) & 0xffff)
 206
 207#define FLEXCAN_TIMEOUT_US		(250)
 208
 209/* Structure of the message buffer */
 210struct flexcan_mb {
 211	u32 can_ctrl;
 212	u32 can_id;
 213	u32 data[];
 214};
 215
 216/* Structure of the hardware registers */
 217struct flexcan_regs {
 218	u32 mcr;		/* 0x00 */
 219	u32 ctrl;		/* 0x04 - Not affected by Soft Reset */
 220	u32 timer;		/* 0x08 */
 221	u32 tcr;		/* 0x0c */
 222	u32 rxgmask;		/* 0x10 - Not affected by Soft Reset */
 223	u32 rx14mask;		/* 0x14 - Not affected by Soft Reset */
 224	u32 rx15mask;		/* 0x18 - Not affected by Soft Reset */
 225	u32 ecr;		/* 0x1c */
 226	u32 esr;		/* 0x20 */
 227	u32 imask2;		/* 0x24 */
 228	u32 imask1;		/* 0x28 */
 229	u32 iflag2;		/* 0x2c */
 230	u32 iflag1;		/* 0x30 */
 231	union {			/* 0x34 */
 232		u32 gfwr_mx28;	/* MX28, MX53 */
 233		u32 ctrl2;	/* MX6, VF610 - Not affected by Soft Reset */
 234	};
 235	u32 esr2;		/* 0x38 */
 236	u32 imeur;		/* 0x3c */
 237	u32 lrfr;		/* 0x40 */
 238	u32 crcr;		/* 0x44 */
 239	u32 rxfgmask;		/* 0x48 */
 240	u32 rxfir;		/* 0x4c - Not affected by Soft Reset */
 241	u32 cbt;		/* 0x50 - Not affected by Soft Reset */
 242	u32 _reserved2;		/* 0x54 */
 243	u32 dbg1;		/* 0x58 */
 244	u32 dbg2;		/* 0x5c */
 245	u32 _reserved3[8];	/* 0x60 */
 246	struct_group(init,
 247		u8 mb[2][512];		/* 0x80 - Not affected by Soft Reset */
 248		/* FIFO-mode:
 249		 *			MB
 250		 * 0x080...0x08f	0	RX message buffer
 251		 * 0x090...0x0df	1-5	reserved
 252		 * 0x0e0...0x0ff	6-7	8 entry ID table
 253		 *				(mx25, mx28, mx35, mx53)
 254		 * 0x0e0...0x2df	6-7..37	8..128 entry ID table
 255		 *				size conf'ed via ctrl2::RFFN
 256		 *				(mx6, vf610)
 257		 */
 258		u32 _reserved4[256];	/* 0x480 */
 259		u32 rximr[64];		/* 0x880 - Not affected by Soft Reset */
 260		u32 _reserved5[24];	/* 0x980 */
 261		u32 gfwr_mx6;		/* 0x9e0 - MX6 */
 262		u32 _reserved6[39];	/* 0x9e4 */
 263		u32 _rxfir[6];		/* 0xa80 */
 264		u32 _reserved8[2];	/* 0xa98 */
 265		u32 _rxmgmask;		/* 0xaa0 */
 266		u32 _rxfgmask;		/* 0xaa4 */
 267		u32 _rx14mask;		/* 0xaa8 */
 268		u32 _rx15mask;		/* 0xaac */
 269		u32 tx_smb[4];		/* 0xab0 */
 270		u32 rx_smb0[4];		/* 0xac0 */
 271		u32 rx_smb1[4];		/* 0xad0 */
 272	);
 273	u32 mecr;		/* 0xae0 */
 274	u32 erriar;		/* 0xae4 */
 275	u32 erridpr;		/* 0xae8 */
 276	u32 errippr;		/* 0xaec */
 277	u32 rerrar;		/* 0xaf0 */
 278	u32 rerrdr;		/* 0xaf4 */
 279	u32 rerrsynr;		/* 0xaf8 */
 280	u32 errsr;		/* 0xafc */
 281	u32 _reserved7[64];	/* 0xb00 */
 282	u32 fdctrl;		/* 0xc00 - Not affected by Soft Reset */
 283	u32 fdcbt;		/* 0xc04 - Not affected by Soft Reset */
 284	u32 fdcrc;		/* 0xc08 */
 285	u32 _reserved9[199];	/* 0xc0c */
 286	struct_group(init_fd,
 287		u32 tx_smb_fd[18];	/* 0xf28 */
 288		u32 rx_smb0_fd[18];	/* 0xf70 */
 289		u32 rx_smb1_fd[18];	/* 0xfb8 */
 290	);
 291};
 292
 293static_assert(sizeof(struct flexcan_regs) ==  0x4 * 18 + 0xfb8);
 294
 295static const struct flexcan_devtype_data fsl_mcf5441x_devtype_data = {
 296	.quirks = FLEXCAN_QUIRK_BROKEN_PERR_STATE |
 297		FLEXCAN_QUIRK_NR_IRQ_3 | FLEXCAN_QUIRK_NR_MB_16 |
 298		FLEXCAN_QUIRK_SUPPORT_RX_MAILBOX |
 299		FLEXCAN_QUIRK_SUPPORT_RX_FIFO,
 300};
 301
 302static const struct flexcan_devtype_data fsl_p1010_devtype_data = {
 303	.quirks = FLEXCAN_QUIRK_BROKEN_WERR_STATE |
 304		FLEXCAN_QUIRK_BROKEN_PERR_STATE |
 305		FLEXCAN_QUIRK_DEFAULT_BIG_ENDIAN |
 306		FLEXCAN_QUIRK_SUPPORT_RX_MAILBOX |
 307		FLEXCAN_QUIRK_SUPPORT_RX_FIFO,
 308};
 309
 310static const struct flexcan_devtype_data fsl_imx25_devtype_data = {
 311	.quirks = FLEXCAN_QUIRK_BROKEN_WERR_STATE |
 312		FLEXCAN_QUIRK_BROKEN_PERR_STATE |
 313		FLEXCAN_QUIRK_SUPPORT_RX_MAILBOX |
 314		FLEXCAN_QUIRK_SUPPORT_RX_FIFO,
 315};
 316
 317static const struct flexcan_devtype_data fsl_imx28_devtype_data = {
 318	.quirks = FLEXCAN_QUIRK_BROKEN_PERR_STATE |
 319		FLEXCAN_QUIRK_SUPPORT_RX_MAILBOX |
 320		FLEXCAN_QUIRK_SUPPORT_RX_FIFO,
 321};
 322
 323static const struct flexcan_devtype_data fsl_imx6q_devtype_data = {
 324	.quirks = FLEXCAN_QUIRK_DISABLE_RXFG | FLEXCAN_QUIRK_ENABLE_EACEN_RRS |
 325		FLEXCAN_QUIRK_USE_RX_MAILBOX | FLEXCAN_QUIRK_BROKEN_PERR_STATE |
 326		FLEXCAN_QUIRK_SETUP_STOP_MODE_GPR |
 327		FLEXCAN_QUIRK_SUPPORT_RX_MAILBOX |
 328		FLEXCAN_QUIRK_SUPPORT_RX_MAILBOX_RTR,
 329};
 330
 331static const struct flexcan_devtype_data fsl_imx8qm_devtype_data = {
 332	.quirks = FLEXCAN_QUIRK_DISABLE_RXFG | FLEXCAN_QUIRK_ENABLE_EACEN_RRS |
 333		FLEXCAN_QUIRK_USE_RX_MAILBOX | FLEXCAN_QUIRK_BROKEN_PERR_STATE |
 334		FLEXCAN_QUIRK_SUPPORT_FD | FLEXCAN_QUIRK_SETUP_STOP_MODE_SCFW |
 335		FLEXCAN_QUIRK_SUPPORT_RX_MAILBOX |
 336		FLEXCAN_QUIRK_SUPPORT_RX_MAILBOX_RTR,
 337};
 338
 339static struct flexcan_devtype_data fsl_imx8mp_devtype_data = {
 340	.quirks = FLEXCAN_QUIRK_DISABLE_RXFG | FLEXCAN_QUIRK_ENABLE_EACEN_RRS |
 341		FLEXCAN_QUIRK_DISABLE_MECR | FLEXCAN_QUIRK_USE_RX_MAILBOX |
 342		FLEXCAN_QUIRK_BROKEN_PERR_STATE | FLEXCAN_QUIRK_SETUP_STOP_MODE_GPR |
 343		FLEXCAN_QUIRK_SUPPORT_FD | FLEXCAN_QUIRK_SUPPORT_ECC |
 344		FLEXCAN_QUIRK_SUPPORT_RX_MAILBOX |
 345		FLEXCAN_QUIRK_SUPPORT_RX_MAILBOX_RTR,
 346};
 347
 348static struct flexcan_devtype_data fsl_imx93_devtype_data = {
 349	.quirks = FLEXCAN_QUIRK_DISABLE_RXFG | FLEXCAN_QUIRK_ENABLE_EACEN_RRS |
 350		FLEXCAN_QUIRK_DISABLE_MECR | FLEXCAN_QUIRK_USE_RX_MAILBOX |
 351		FLEXCAN_QUIRK_BROKEN_PERR_STATE | FLEXCAN_QUIRK_SETUP_STOP_MODE_GPR |
 352		FLEXCAN_QUIRK_SUPPORT_FD | FLEXCAN_QUIRK_SUPPORT_ECC |
 353		FLEXCAN_QUIRK_SUPPORT_RX_MAILBOX |
 354		FLEXCAN_QUIRK_SUPPORT_RX_MAILBOX_RTR,
 355};
 356
 357static const struct flexcan_devtype_data fsl_vf610_devtype_data = {
 358	.quirks = FLEXCAN_QUIRK_DISABLE_RXFG | FLEXCAN_QUIRK_ENABLE_EACEN_RRS |
 359		FLEXCAN_QUIRK_DISABLE_MECR | FLEXCAN_QUIRK_USE_RX_MAILBOX |
 360		FLEXCAN_QUIRK_BROKEN_PERR_STATE | FLEXCAN_QUIRK_SUPPORT_ECC |
 361		FLEXCAN_QUIRK_SUPPORT_RX_MAILBOX |
 362		FLEXCAN_QUIRK_SUPPORT_RX_MAILBOX_RTR,
 363};
 364
 365static const struct flexcan_devtype_data fsl_ls1021a_r2_devtype_data = {
 366	.quirks = FLEXCAN_QUIRK_DISABLE_RXFG | FLEXCAN_QUIRK_ENABLE_EACEN_RRS |
 367		FLEXCAN_QUIRK_BROKEN_PERR_STATE | FLEXCAN_QUIRK_USE_RX_MAILBOX |
 368		FLEXCAN_QUIRK_SUPPORT_RX_MAILBOX |
 369		FLEXCAN_QUIRK_SUPPORT_RX_MAILBOX_RTR,
 370};
 371
 372static const struct flexcan_devtype_data fsl_lx2160a_r1_devtype_data = {
 373	.quirks = FLEXCAN_QUIRK_DISABLE_RXFG | FLEXCAN_QUIRK_ENABLE_EACEN_RRS |
 374		FLEXCAN_QUIRK_DISABLE_MECR | FLEXCAN_QUIRK_BROKEN_PERR_STATE |
 375		FLEXCAN_QUIRK_USE_RX_MAILBOX | FLEXCAN_QUIRK_SUPPORT_FD |
 376		FLEXCAN_QUIRK_SUPPORT_ECC |
 377		FLEXCAN_QUIRK_SUPPORT_RX_MAILBOX |
 378		FLEXCAN_QUIRK_SUPPORT_RX_MAILBOX_RTR,
 379};
 380
 381static const struct can_bittiming_const flexcan_bittiming_const = {
 382	.name = DRV_NAME,
 383	.tseg1_min = 4,
 384	.tseg1_max = 16,
 385	.tseg2_min = 2,
 386	.tseg2_max = 8,
 387	.sjw_max = 4,
 388	.brp_min = 1,
 389	.brp_max = 256,
 390	.brp_inc = 1,
 391};
 392
 393static const struct can_bittiming_const flexcan_fd_bittiming_const = {
 394	.name = DRV_NAME,
 395	.tseg1_min = 2,
 396	.tseg1_max = 96,
 397	.tseg2_min = 2,
 398	.tseg2_max = 32,
 399	.sjw_max = 16,
 400	.brp_min = 1,
 401	.brp_max = 1024,
 402	.brp_inc = 1,
 403};
 404
 405static const struct can_bittiming_const flexcan_fd_data_bittiming_const = {
 406	.name = DRV_NAME,
 407	.tseg1_min = 2,
 408	.tseg1_max = 39,
 409	.tseg2_min = 2,
 410	.tseg2_max = 8,
 411	.sjw_max = 4,
 412	.brp_min = 1,
 413	.brp_max = 1024,
 414	.brp_inc = 1,
 415};
 416
 417/* FlexCAN module is essentially modelled as a little-endian IP in most
 418 * SoCs, i.e the registers as well as the message buffer areas are
 419 * implemented in a little-endian fashion.
 420 *
 421 * However there are some SoCs (e.g. LS1021A) which implement the FlexCAN
 422 * module in a big-endian fashion (i.e the registers as well as the
 423 * message buffer areas are implemented in a big-endian way).
 424 *
 425 * In addition, the FlexCAN module can be found on SoCs having ARM or
 426 * PPC cores. So, we need to abstract off the register read/write
 427 * functions, ensuring that these cater to all the combinations of module
 428 * endianness and underlying CPU endianness.
 429 */
 430static inline u32 flexcan_read_be(void __iomem *addr)
 431{
 432	return ioread32be(addr);
 433}
 434
 435static inline void flexcan_write_be(u32 val, void __iomem *addr)
 436{
 437	iowrite32be(val, addr);
 438}
 439
 440static inline u32 flexcan_read_le(void __iomem *addr)
 441{
 442	return ioread32(addr);
 443}
 444
 445static inline void flexcan_write_le(u32 val, void __iomem *addr)
 446{
 447	iowrite32(val, addr);
 448}
 449
 450static struct flexcan_mb __iomem *flexcan_get_mb(const struct flexcan_priv *priv,
 451						 u8 mb_index)
 452{
 453	u8 bank_size;
 454	bool bank;
 455
 456	if (WARN_ON(mb_index >= priv->mb_count))
 457		return NULL;
 458
 459	bank_size = sizeof(priv->regs->mb[0]) / priv->mb_size;
 460
 461	bank = mb_index >= bank_size;
 462	if (bank)
 463		mb_index -= bank_size;
 464
 465	return (struct flexcan_mb __iomem *)
 466		(&priv->regs->mb[bank][priv->mb_size * mb_index]);
 467}
 468
 469static int flexcan_low_power_enter_ack(struct flexcan_priv *priv)
 470{
 471	struct flexcan_regs __iomem *regs = priv->regs;
 472	unsigned int timeout = FLEXCAN_TIMEOUT_US / 10;
 473
 474	while (timeout-- && !(priv->read(&regs->mcr) & FLEXCAN_MCR_LPM_ACK))
 475		udelay(10);
 476
 477	if (!(priv->read(&regs->mcr) & FLEXCAN_MCR_LPM_ACK))
 478		return -ETIMEDOUT;
 479
 480	return 0;
 481}
 482
 483static int flexcan_low_power_exit_ack(struct flexcan_priv *priv)
 484{
 485	struct flexcan_regs __iomem *regs = priv->regs;
 486	unsigned int timeout = FLEXCAN_TIMEOUT_US / 10;
 487
 488	while (timeout-- && (priv->read(&regs->mcr) & FLEXCAN_MCR_LPM_ACK))
 489		udelay(10);
 490
 491	if (priv->read(&regs->mcr) & FLEXCAN_MCR_LPM_ACK)
 492		return -ETIMEDOUT;
 493
 494	return 0;
 495}
 496
 497static void flexcan_enable_wakeup_irq(struct flexcan_priv *priv, bool enable)
 498{
 499	struct flexcan_regs __iomem *regs = priv->regs;
 500	u32 reg_mcr;
 501
 502	reg_mcr = priv->read(&regs->mcr);
 503
 504	if (enable)
 505		reg_mcr |= FLEXCAN_MCR_WAK_MSK;
 506	else
 507		reg_mcr &= ~FLEXCAN_MCR_WAK_MSK;
 508
 509	priv->write(reg_mcr, &regs->mcr);
 510}
 511
 512static int flexcan_stop_mode_enable_scfw(struct flexcan_priv *priv, bool enabled)
 513{
 514	u8 idx = priv->scu_idx;
 515	u32 rsrc_id, val;
 516
 517	rsrc_id = IMX_SC_R_CAN(idx);
 518
 519	if (enabled)
 520		val = 1;
 521	else
 522		val = 0;
 523
 524	/* stop mode request via scu firmware */
 525	return imx_sc_misc_set_control(priv->sc_ipc_handle, rsrc_id,
 526				       IMX_SC_C_IPG_STOP, val);
 527}
 528
 529static inline int flexcan_enter_stop_mode(struct flexcan_priv *priv)
 530{
 531	struct flexcan_regs __iomem *regs = priv->regs;
 532	u32 reg_mcr;
 533	int ret;
 534
 535	reg_mcr = priv->read(&regs->mcr);
 536	reg_mcr |= FLEXCAN_MCR_SLF_WAK;
 537	priv->write(reg_mcr, &regs->mcr);
 538
 539	/* enable stop request */
 540	if (priv->devtype_data.quirks & FLEXCAN_QUIRK_SETUP_STOP_MODE_SCFW) {
 541		ret = flexcan_stop_mode_enable_scfw(priv, true);
 542		if (ret < 0)
 543			return ret;
 544	} else if (priv->devtype_data.quirks & FLEXCAN_QUIRK_SETUP_STOP_MODE_GPR) {
 545		regmap_update_bits(priv->stm.gpr, priv->stm.req_gpr,
 546				   1 << priv->stm.req_bit, 1 << priv->stm.req_bit);
 
 
 
 
 
 547	}
 548
 549	return flexcan_low_power_enter_ack(priv);
 550}
 551
 552static inline int flexcan_exit_stop_mode(struct flexcan_priv *priv)
 553{
 554	struct flexcan_regs __iomem *regs = priv->regs;
 555	u32 reg_mcr;
 556	int ret;
 557
 558	/* remove stop request */
 559	if (priv->devtype_data.quirks & FLEXCAN_QUIRK_SETUP_STOP_MODE_SCFW) {
 560		ret = flexcan_stop_mode_enable_scfw(priv, false);
 561		if (ret < 0)
 562			return ret;
 563	} else if (priv->devtype_data.quirks & FLEXCAN_QUIRK_SETUP_STOP_MODE_GPR) {
 564		regmap_update_bits(priv->stm.gpr, priv->stm.req_gpr,
 565				   1 << priv->stm.req_bit, 0);
 566	}
 567
 568	reg_mcr = priv->read(&regs->mcr);
 569	reg_mcr &= ~FLEXCAN_MCR_SLF_WAK;
 570	priv->write(reg_mcr, &regs->mcr);
 571
 
 
 
 
 
 
 572	return flexcan_low_power_exit_ack(priv);
 573}
 574
 575static inline void flexcan_error_irq_enable(const struct flexcan_priv *priv)
 576{
 577	struct flexcan_regs __iomem *regs = priv->regs;
 578	u32 reg_ctrl = (priv->reg_ctrl_default | FLEXCAN_CTRL_ERR_MSK);
 579
 580	priv->write(reg_ctrl, &regs->ctrl);
 581}
 582
 583static inline void flexcan_error_irq_disable(const struct flexcan_priv *priv)
 584{
 585	struct flexcan_regs __iomem *regs = priv->regs;
 586	u32 reg_ctrl = (priv->reg_ctrl_default & ~FLEXCAN_CTRL_ERR_MSK);
 587
 588	priv->write(reg_ctrl, &regs->ctrl);
 589}
 590
 591static int flexcan_clks_enable(const struct flexcan_priv *priv)
 592{
 593	int err = 0;
 594
 595	if (priv->clk_ipg) {
 596		err = clk_prepare_enable(priv->clk_ipg);
 597		if (err)
 598			return err;
 599	}
 600
 601	if (priv->clk_per) {
 602		err = clk_prepare_enable(priv->clk_per);
 603		if (err)
 604			clk_disable_unprepare(priv->clk_ipg);
 605	}
 606
 607	return err;
 608}
 609
 610static void flexcan_clks_disable(const struct flexcan_priv *priv)
 611{
 612	clk_disable_unprepare(priv->clk_per);
 613	clk_disable_unprepare(priv->clk_ipg);
 614}
 615
 616static inline int flexcan_transceiver_enable(const struct flexcan_priv *priv)
 617{
 618	if (!priv->reg_xceiver)
 619		return 0;
 620
 621	return regulator_enable(priv->reg_xceiver);
 622}
 623
 624static inline int flexcan_transceiver_disable(const struct flexcan_priv *priv)
 625{
 626	if (!priv->reg_xceiver)
 627		return 0;
 628
 629	return regulator_disable(priv->reg_xceiver);
 630}
 631
 632static int flexcan_chip_enable(struct flexcan_priv *priv)
 633{
 634	struct flexcan_regs __iomem *regs = priv->regs;
 635	u32 reg;
 636
 637	reg = priv->read(&regs->mcr);
 638	reg &= ~FLEXCAN_MCR_MDIS;
 639	priv->write(reg, &regs->mcr);
 640
 641	return flexcan_low_power_exit_ack(priv);
 642}
 643
 644static int flexcan_chip_disable(struct flexcan_priv *priv)
 645{
 646	struct flexcan_regs __iomem *regs = priv->regs;
 647	u32 reg;
 648
 649	reg = priv->read(&regs->mcr);
 650	reg |= FLEXCAN_MCR_MDIS;
 651	priv->write(reg, &regs->mcr);
 652
 653	return flexcan_low_power_enter_ack(priv);
 654}
 655
 656static int flexcan_chip_freeze(struct flexcan_priv *priv)
 657{
 658	struct flexcan_regs __iomem *regs = priv->regs;
 659	unsigned int timeout;
 660	u32 bitrate = priv->can.bittiming.bitrate;
 661	u32 reg;
 662
 663	if (bitrate)
 664		timeout = 1000 * 1000 * 10 / bitrate;
 665	else
 666		timeout = FLEXCAN_TIMEOUT_US / 10;
 667
 668	reg = priv->read(&regs->mcr);
 669	reg |= FLEXCAN_MCR_FRZ | FLEXCAN_MCR_HALT;
 670	priv->write(reg, &regs->mcr);
 671
 672	while (timeout-- && !(priv->read(&regs->mcr) & FLEXCAN_MCR_FRZ_ACK))
 673		udelay(100);
 674
 675	if (!(priv->read(&regs->mcr) & FLEXCAN_MCR_FRZ_ACK))
 676		return -ETIMEDOUT;
 677
 678	return 0;
 679}
 680
 681static int flexcan_chip_unfreeze(struct flexcan_priv *priv)
 682{
 683	struct flexcan_regs __iomem *regs = priv->regs;
 684	unsigned int timeout = FLEXCAN_TIMEOUT_US / 10;
 685	u32 reg;
 686
 687	reg = priv->read(&regs->mcr);
 688	reg &= ~FLEXCAN_MCR_HALT;
 689	priv->write(reg, &regs->mcr);
 690
 691	while (timeout-- && (priv->read(&regs->mcr) & FLEXCAN_MCR_FRZ_ACK))
 692		udelay(10);
 693
 694	if (priv->read(&regs->mcr) & FLEXCAN_MCR_FRZ_ACK)
 695		return -ETIMEDOUT;
 696
 697	return 0;
 698}
 699
 700static int flexcan_chip_softreset(struct flexcan_priv *priv)
 701{
 702	struct flexcan_regs __iomem *regs = priv->regs;
 703	unsigned int timeout = FLEXCAN_TIMEOUT_US / 10;
 704
 705	priv->write(FLEXCAN_MCR_SOFTRST, &regs->mcr);
 706	while (timeout-- && (priv->read(&regs->mcr) & FLEXCAN_MCR_SOFTRST))
 707		udelay(10);
 708
 709	if (priv->read(&regs->mcr) & FLEXCAN_MCR_SOFTRST)
 710		return -ETIMEDOUT;
 711
 712	return 0;
 713}
 714
 715static int __flexcan_get_berr_counter(const struct net_device *dev,
 716				      struct can_berr_counter *bec)
 717{
 718	const struct flexcan_priv *priv = netdev_priv(dev);
 719	struct flexcan_regs __iomem *regs = priv->regs;
 720	u32 reg = priv->read(&regs->ecr);
 721
 722	bec->txerr = (reg >> 0) & 0xff;
 723	bec->rxerr = (reg >> 8) & 0xff;
 724
 725	return 0;
 726}
 727
 728static int flexcan_get_berr_counter(const struct net_device *dev,
 729				    struct can_berr_counter *bec)
 730{
 731	const struct flexcan_priv *priv = netdev_priv(dev);
 732	int err;
 733
 734	err = pm_runtime_resume_and_get(priv->dev);
 735	if (err < 0)
 736		return err;
 737
 738	err = __flexcan_get_berr_counter(dev, bec);
 739
 740	pm_runtime_put(priv->dev);
 741
 742	return err;
 743}
 744
 745static netdev_tx_t flexcan_start_xmit(struct sk_buff *skb, struct net_device *dev)
 746{
 747	const struct flexcan_priv *priv = netdev_priv(dev);
 748	struct canfd_frame *cfd = (struct canfd_frame *)skb->data;
 749	u32 can_id;
 750	u32 data;
 751	u32 ctrl = FLEXCAN_MB_CODE_TX_DATA | ((can_fd_len2dlc(cfd->len)) << 16);
 752	int i;
 753
 754	if (can_dev_dropped_skb(dev, skb))
 755		return NETDEV_TX_OK;
 756
 757	netif_stop_queue(dev);
 758
 759	if (cfd->can_id & CAN_EFF_FLAG) {
 760		can_id = cfd->can_id & CAN_EFF_MASK;
 761		ctrl |= FLEXCAN_MB_CNT_IDE | FLEXCAN_MB_CNT_SRR;
 762	} else {
 763		can_id = (cfd->can_id & CAN_SFF_MASK) << 18;
 764	}
 765
 766	if (cfd->can_id & CAN_RTR_FLAG)
 767		ctrl |= FLEXCAN_MB_CNT_RTR;
 768
 769	if (can_is_canfd_skb(skb)) {
 770		ctrl |= FLEXCAN_MB_CNT_EDL;
 771
 772		if (cfd->flags & CANFD_BRS)
 773			ctrl |= FLEXCAN_MB_CNT_BRS;
 774	}
 775
 776	for (i = 0; i < cfd->len; i += sizeof(u32)) {
 777		data = be32_to_cpup((__be32 *)&cfd->data[i]);
 778		priv->write(data, &priv->tx_mb->data[i / sizeof(u32)]);
 779	}
 780
 781	can_put_echo_skb(skb, dev, 0, 0);
 782
 783	priv->write(can_id, &priv->tx_mb->can_id);
 784	priv->write(ctrl, &priv->tx_mb->can_ctrl);
 785
 786	/* Errata ERR005829 step8:
 787	 * Write twice INACTIVE(0x8) code to first MB.
 788	 */
 789	priv->write(FLEXCAN_MB_CODE_TX_INACTIVE,
 790		    &priv->tx_mb_reserved->can_ctrl);
 791	priv->write(FLEXCAN_MB_CODE_TX_INACTIVE,
 792		    &priv->tx_mb_reserved->can_ctrl);
 793
 794	return NETDEV_TX_OK;
 795}
 796
 797static void flexcan_irq_bus_err(struct net_device *dev, u32 reg_esr)
 798{
 799	struct flexcan_priv *priv = netdev_priv(dev);
 800	struct flexcan_regs __iomem *regs = priv->regs;
 801	struct sk_buff *skb;
 802	struct can_frame *cf;
 803	bool rx_errors = false, tx_errors = false;
 804	u32 timestamp;
 805	int err;
 806
 807	timestamp = priv->read(&regs->timer) << 16;
 808
 809	skb = alloc_can_err_skb(dev, &cf);
 810	if (unlikely(!skb))
 811		return;
 812
 813	cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
 814
 815	if (reg_esr & FLEXCAN_ESR_BIT1_ERR) {
 816		netdev_dbg(dev, "BIT1_ERR irq\n");
 817		cf->data[2] |= CAN_ERR_PROT_BIT1;
 818		tx_errors = true;
 819	}
 820	if (reg_esr & FLEXCAN_ESR_BIT0_ERR) {
 821		netdev_dbg(dev, "BIT0_ERR irq\n");
 822		cf->data[2] |= CAN_ERR_PROT_BIT0;
 823		tx_errors = true;
 824	}
 825	if (reg_esr & FLEXCAN_ESR_ACK_ERR) {
 826		netdev_dbg(dev, "ACK_ERR irq\n");
 827		cf->can_id |= CAN_ERR_ACK;
 828		cf->data[3] = CAN_ERR_PROT_LOC_ACK;
 829		tx_errors = true;
 830	}
 831	if (reg_esr & FLEXCAN_ESR_CRC_ERR) {
 832		netdev_dbg(dev, "CRC_ERR irq\n");
 833		cf->data[2] |= CAN_ERR_PROT_BIT;
 834		cf->data[3] = CAN_ERR_PROT_LOC_CRC_SEQ;
 835		rx_errors = true;
 836	}
 837	if (reg_esr & FLEXCAN_ESR_FRM_ERR) {
 838		netdev_dbg(dev, "FRM_ERR irq\n");
 839		cf->data[2] |= CAN_ERR_PROT_FORM;
 840		rx_errors = true;
 841	}
 842	if (reg_esr & FLEXCAN_ESR_STF_ERR) {
 843		netdev_dbg(dev, "STF_ERR irq\n");
 844		cf->data[2] |= CAN_ERR_PROT_STUFF;
 845		rx_errors = true;
 846	}
 847
 848	priv->can.can_stats.bus_error++;
 849	if (rx_errors)
 850		dev->stats.rx_errors++;
 851	if (tx_errors)
 852		dev->stats.tx_errors++;
 853
 854	err = can_rx_offload_queue_timestamp(&priv->offload, skb, timestamp);
 855	if (err)
 856		dev->stats.rx_fifo_errors++;
 857}
 858
 859static void flexcan_irq_state(struct net_device *dev, u32 reg_esr)
 860{
 861	struct flexcan_priv *priv = netdev_priv(dev);
 862	struct flexcan_regs __iomem *regs = priv->regs;
 863	struct sk_buff *skb;
 864	struct can_frame *cf;
 865	enum can_state new_state, rx_state, tx_state;
 866	int flt;
 867	struct can_berr_counter bec;
 868	u32 timestamp;
 869	int err;
 870
 871	flt = reg_esr & FLEXCAN_ESR_FLT_CONF_MASK;
 872	if (likely(flt == FLEXCAN_ESR_FLT_CONF_ACTIVE)) {
 873		tx_state = unlikely(reg_esr & FLEXCAN_ESR_TX_WRN) ?
 874			CAN_STATE_ERROR_WARNING : CAN_STATE_ERROR_ACTIVE;
 875		rx_state = unlikely(reg_esr & FLEXCAN_ESR_RX_WRN) ?
 876			CAN_STATE_ERROR_WARNING : CAN_STATE_ERROR_ACTIVE;
 877		new_state = max(tx_state, rx_state);
 878	} else {
 879		__flexcan_get_berr_counter(dev, &bec);
 880		new_state = flt == FLEXCAN_ESR_FLT_CONF_PASSIVE ?
 881			CAN_STATE_ERROR_PASSIVE : CAN_STATE_BUS_OFF;
 882		rx_state = bec.rxerr >= bec.txerr ? new_state : 0;
 883		tx_state = bec.rxerr <= bec.txerr ? new_state : 0;
 884	}
 885
 886	/* state hasn't changed */
 887	if (likely(new_state == priv->can.state))
 888		return;
 889
 890	timestamp = priv->read(&regs->timer) << 16;
 891
 892	skb = alloc_can_err_skb(dev, &cf);
 893	if (unlikely(!skb))
 894		return;
 895
 896	can_change_state(dev, cf, tx_state, rx_state);
 897
 898	if (unlikely(new_state == CAN_STATE_BUS_OFF))
 899		can_bus_off(dev);
 900
 901	err = can_rx_offload_queue_timestamp(&priv->offload, skb, timestamp);
 902	if (err)
 903		dev->stats.rx_fifo_errors++;
 904}
 905
 906static inline u64 flexcan_read64_mask(struct flexcan_priv *priv, void __iomem *addr, u64 mask)
 907{
 908	u64 reg = 0;
 909
 910	if (upper_32_bits(mask))
 911		reg = (u64)priv->read(addr - 4) << 32;
 912	if (lower_32_bits(mask))
 913		reg |= priv->read(addr);
 914
 915	return reg & mask;
 916}
 917
 918static inline void flexcan_write64(struct flexcan_priv *priv, u64 val, void __iomem *addr)
 919{
 920	if (upper_32_bits(val))
 921		priv->write(upper_32_bits(val), addr - 4);
 922	if (lower_32_bits(val))
 923		priv->write(lower_32_bits(val), addr);
 924}
 925
 926static inline u64 flexcan_read_reg_iflag_rx(struct flexcan_priv *priv)
 927{
 928	return flexcan_read64_mask(priv, &priv->regs->iflag1, priv->rx_mask);
 929}
 930
 931static inline u64 flexcan_read_reg_iflag_tx(struct flexcan_priv *priv)
 932{
 933	return flexcan_read64_mask(priv, &priv->regs->iflag1, priv->tx_mask);
 934}
 935
 936static inline struct flexcan_priv *rx_offload_to_priv(struct can_rx_offload *offload)
 937{
 938	return container_of(offload, struct flexcan_priv, offload);
 939}
 940
 941static struct sk_buff *flexcan_mailbox_read(struct can_rx_offload *offload,
 942					    unsigned int n, u32 *timestamp,
 943					    bool drop)
 944{
 945	struct flexcan_priv *priv = rx_offload_to_priv(offload);
 946	struct flexcan_regs __iomem *regs = priv->regs;
 947	struct flexcan_mb __iomem *mb;
 948	struct sk_buff *skb;
 949	struct canfd_frame *cfd;
 950	u32 reg_ctrl, reg_id, reg_iflag1;
 951	int i;
 952
 953	mb = flexcan_get_mb(priv, n);
 954
 955	if (priv->devtype_data.quirks & FLEXCAN_QUIRK_USE_RX_MAILBOX) {
 956		u32 code;
 957
 958		do {
 959			reg_ctrl = priv->read(&mb->can_ctrl);
 960		} while (reg_ctrl & FLEXCAN_MB_CODE_RX_BUSY_BIT);
 961
 962		/* is this MB empty? */
 963		code = reg_ctrl & FLEXCAN_MB_CODE_MASK;
 964		if ((code != FLEXCAN_MB_CODE_RX_FULL) &&
 965		    (code != FLEXCAN_MB_CODE_RX_OVERRUN))
 966			return NULL;
 967
 968		if (code == FLEXCAN_MB_CODE_RX_OVERRUN) {
 969			/* This MB was overrun, we lost data */
 970			offload->dev->stats.rx_over_errors++;
 971			offload->dev->stats.rx_errors++;
 972		}
 973	} else {
 974		reg_iflag1 = priv->read(&regs->iflag1);
 975		if (!(reg_iflag1 & FLEXCAN_IFLAG_RX_FIFO_AVAILABLE))
 976			return NULL;
 977
 978		reg_ctrl = priv->read(&mb->can_ctrl);
 979	}
 980
 981	if (unlikely(drop)) {
 982		skb = ERR_PTR(-ENOBUFS);
 983		goto mark_as_read;
 984	}
 985
 986	if (reg_ctrl & FLEXCAN_MB_CNT_EDL)
 987		skb = alloc_canfd_skb(offload->dev, &cfd);
 988	else
 989		skb = alloc_can_skb(offload->dev, (struct can_frame **)&cfd);
 990	if (unlikely(!skb)) {
 991		skb = ERR_PTR(-ENOMEM);
 992		goto mark_as_read;
 993	}
 994
 995	/* increase timstamp to full 32 bit */
 996	*timestamp = reg_ctrl << 16;
 997
 998	reg_id = priv->read(&mb->can_id);
 999	if (reg_ctrl & FLEXCAN_MB_CNT_IDE)
1000		cfd->can_id = ((reg_id >> 0) & CAN_EFF_MASK) | CAN_EFF_FLAG;
1001	else
1002		cfd->can_id = (reg_id >> 18) & CAN_SFF_MASK;
1003
1004	if (reg_ctrl & FLEXCAN_MB_CNT_EDL) {
1005		cfd->len = can_fd_dlc2len((reg_ctrl >> 16) & 0xf);
1006
1007		if (reg_ctrl & FLEXCAN_MB_CNT_BRS)
1008			cfd->flags |= CANFD_BRS;
1009	} else {
1010		cfd->len = can_cc_dlc2len((reg_ctrl >> 16) & 0xf);
1011
1012		if (reg_ctrl & FLEXCAN_MB_CNT_RTR)
1013			cfd->can_id |= CAN_RTR_FLAG;
1014	}
1015
1016	if (reg_ctrl & FLEXCAN_MB_CNT_ESI)
1017		cfd->flags |= CANFD_ESI;
1018
1019	for (i = 0; i < cfd->len; i += sizeof(u32)) {
1020		__be32 data = cpu_to_be32(priv->read(&mb->data[i / sizeof(u32)]));
1021		*(__be32 *)(cfd->data + i) = data;
1022	}
1023
1024 mark_as_read:
1025	if (priv->devtype_data.quirks & FLEXCAN_QUIRK_USE_RX_MAILBOX)
1026		flexcan_write64(priv, FLEXCAN_IFLAG_MB(n), &regs->iflag1);
1027	else
1028		priv->write(FLEXCAN_IFLAG_RX_FIFO_AVAILABLE, &regs->iflag1);
1029
1030	/* Read the Free Running Timer. It is optional but recommended
1031	 * to unlock Mailbox as soon as possible and make it available
1032	 * for reception.
1033	 */
1034	priv->read(&regs->timer);
1035
1036	return skb;
1037}
1038
1039static irqreturn_t flexcan_irq(int irq, void *dev_id)
1040{
1041	struct net_device *dev = dev_id;
1042	struct net_device_stats *stats = &dev->stats;
1043	struct flexcan_priv *priv = netdev_priv(dev);
1044	struct flexcan_regs __iomem *regs = priv->regs;
1045	irqreturn_t handled = IRQ_NONE;
1046	u64 reg_iflag_tx;
1047	u32 reg_esr;
1048	enum can_state last_state = priv->can.state;
1049
1050	/* reception interrupt */
1051	if (priv->devtype_data.quirks & FLEXCAN_QUIRK_USE_RX_MAILBOX) {
1052		u64 reg_iflag_rx;
1053		int ret;
1054
1055		while ((reg_iflag_rx = flexcan_read_reg_iflag_rx(priv))) {
1056			handled = IRQ_HANDLED;
1057			ret = can_rx_offload_irq_offload_timestamp(&priv->offload,
1058								   reg_iflag_rx);
1059			if (!ret)
1060				break;
1061		}
1062	} else {
1063		u32 reg_iflag1;
1064
1065		reg_iflag1 = priv->read(&regs->iflag1);
1066		if (reg_iflag1 & FLEXCAN_IFLAG_RX_FIFO_AVAILABLE) {
1067			handled = IRQ_HANDLED;
1068			can_rx_offload_irq_offload_fifo(&priv->offload);
1069		}
1070
1071		/* FIFO overflow interrupt */
1072		if (reg_iflag1 & FLEXCAN_IFLAG_RX_FIFO_OVERFLOW) {
1073			handled = IRQ_HANDLED;
1074			priv->write(FLEXCAN_IFLAG_RX_FIFO_OVERFLOW,
1075				    &regs->iflag1);
1076			dev->stats.rx_over_errors++;
1077			dev->stats.rx_errors++;
1078		}
1079	}
1080
1081	reg_iflag_tx = flexcan_read_reg_iflag_tx(priv);
1082
1083	/* transmission complete interrupt */
1084	if (reg_iflag_tx & priv->tx_mask) {
1085		u32 reg_ctrl = priv->read(&priv->tx_mb->can_ctrl);
1086
1087		handled = IRQ_HANDLED;
1088		stats->tx_bytes +=
1089			can_rx_offload_get_echo_skb_queue_timestamp(&priv->offload, 0,
1090								    reg_ctrl << 16, NULL);
1091		stats->tx_packets++;
1092
1093		/* after sending a RTR frame MB is in RX mode */
1094		priv->write(FLEXCAN_MB_CODE_TX_INACTIVE,
1095			    &priv->tx_mb->can_ctrl);
1096		flexcan_write64(priv, priv->tx_mask, &regs->iflag1);
1097		netif_wake_queue(dev);
1098	}
1099
1100	reg_esr = priv->read(&regs->esr);
1101
1102	/* ACK all bus error, state change and wake IRQ sources */
1103	if (reg_esr & (FLEXCAN_ESR_ALL_INT | FLEXCAN_ESR_WAK_INT)) {
1104		handled = IRQ_HANDLED;
1105		priv->write(reg_esr & (FLEXCAN_ESR_ALL_INT | FLEXCAN_ESR_WAK_INT), &regs->esr);
1106	}
1107
1108	/* state change interrupt or broken error state quirk fix is enabled */
1109	if ((reg_esr & FLEXCAN_ESR_ERR_STATE) ||
1110	    (priv->devtype_data.quirks & (FLEXCAN_QUIRK_BROKEN_WERR_STATE |
1111					   FLEXCAN_QUIRK_BROKEN_PERR_STATE)))
1112		flexcan_irq_state(dev, reg_esr);
1113
1114	/* bus error IRQ - handle if bus error reporting is activated */
1115	if ((reg_esr & FLEXCAN_ESR_ERR_BUS) &&
1116	    (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING))
1117		flexcan_irq_bus_err(dev, reg_esr);
1118
1119	/* availability of error interrupt among state transitions in case
1120	 * bus error reporting is de-activated and
1121	 * FLEXCAN_QUIRK_BROKEN_PERR_STATE is enabled:
1122	 *  +--------------------------------------------------------------+
1123	 *  | +----------------------------------------------+ [stopped /  |
1124	 *  | |                                              |  sleeping] -+
1125	 *  +-+-> active <-> warning <-> passive -> bus off -+
1126	 *        ___________^^^^^^^^^^^^_______________________________
1127	 *        disabled(1)  enabled             disabled
1128	 *
1129	 * (1): enabled if FLEXCAN_QUIRK_BROKEN_WERR_STATE is enabled
1130	 */
1131	if ((last_state != priv->can.state) &&
1132	    (priv->devtype_data.quirks & FLEXCAN_QUIRK_BROKEN_PERR_STATE) &&
1133	    !(priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)) {
1134		switch (priv->can.state) {
1135		case CAN_STATE_ERROR_ACTIVE:
1136			if (priv->devtype_data.quirks &
1137			    FLEXCAN_QUIRK_BROKEN_WERR_STATE)
1138				flexcan_error_irq_enable(priv);
1139			else
1140				flexcan_error_irq_disable(priv);
1141			break;
1142
1143		case CAN_STATE_ERROR_WARNING:
1144			flexcan_error_irq_enable(priv);
1145			break;
1146
1147		case CAN_STATE_ERROR_PASSIVE:
1148		case CAN_STATE_BUS_OFF:
1149			flexcan_error_irq_disable(priv);
1150			break;
1151
1152		default:
1153			break;
1154		}
1155	}
1156
1157	if (handled)
1158		can_rx_offload_irq_finish(&priv->offload);
1159
1160	return handled;
1161}
1162
1163static void flexcan_set_bittiming_ctrl(const struct net_device *dev)
1164{
1165	const struct flexcan_priv *priv = netdev_priv(dev);
1166	const struct can_bittiming *bt = &priv->can.bittiming;
1167	struct flexcan_regs __iomem *regs = priv->regs;
1168	u32 reg;
1169
1170	reg = priv->read(&regs->ctrl);
1171	reg &= ~(FLEXCAN_CTRL_PRESDIV(0xff) |
1172		 FLEXCAN_CTRL_RJW(0x3) |
1173		 FLEXCAN_CTRL_PSEG1(0x7) |
1174		 FLEXCAN_CTRL_PSEG2(0x7) |
1175		 FLEXCAN_CTRL_PROPSEG(0x7));
1176
1177	reg |= FLEXCAN_CTRL_PRESDIV(bt->brp - 1) |
1178		FLEXCAN_CTRL_PSEG1(bt->phase_seg1 - 1) |
1179		FLEXCAN_CTRL_PSEG2(bt->phase_seg2 - 1) |
1180		FLEXCAN_CTRL_RJW(bt->sjw - 1) |
1181		FLEXCAN_CTRL_PROPSEG(bt->prop_seg - 1);
1182
1183	netdev_dbg(dev, "writing ctrl=0x%08x\n", reg);
1184	priv->write(reg, &regs->ctrl);
1185
1186	/* print chip status */
1187	netdev_dbg(dev, "%s: mcr=0x%08x ctrl=0x%08x\n", __func__,
1188		   priv->read(&regs->mcr), priv->read(&regs->ctrl));
1189}
1190
1191static void flexcan_set_bittiming_cbt(const struct net_device *dev)
1192{
1193	struct flexcan_priv *priv = netdev_priv(dev);
1194	struct can_bittiming *bt = &priv->can.bittiming;
1195	struct can_bittiming *dbt = &priv->can.data_bittiming;
1196	struct flexcan_regs __iomem *regs = priv->regs;
1197	u32 reg_cbt, reg_fdctrl;
1198
1199	/* CBT */
1200	/* CBT[EPSEG1] is 5 bit long and CBT[EPROPSEG] is 6 bit
1201	 * long. The can_calc_bittiming() tries to divide the tseg1
1202	 * equally between phase_seg1 and prop_seg, which may not fit
1203	 * in CBT register. Therefore, if phase_seg1 is more than
1204	 * possible value, increase prop_seg and decrease phase_seg1.
1205	 */
1206	if (bt->phase_seg1 > 0x20) {
1207		bt->prop_seg += (bt->phase_seg1 - 0x20);
1208		bt->phase_seg1 = 0x20;
1209	}
1210
1211	reg_cbt = FLEXCAN_CBT_BTF |
1212		FIELD_PREP(FLEXCAN_CBT_EPRESDIV_MASK, bt->brp - 1) |
1213		FIELD_PREP(FLEXCAN_CBT_ERJW_MASK, bt->sjw - 1) |
1214		FIELD_PREP(FLEXCAN_CBT_EPROPSEG_MASK, bt->prop_seg - 1) |
1215		FIELD_PREP(FLEXCAN_CBT_EPSEG1_MASK, bt->phase_seg1 - 1) |
1216		FIELD_PREP(FLEXCAN_CBT_EPSEG2_MASK, bt->phase_seg2 - 1);
1217
1218	netdev_dbg(dev, "writing cbt=0x%08x\n", reg_cbt);
1219	priv->write(reg_cbt, &regs->cbt);
1220
1221	if (priv->can.ctrlmode & CAN_CTRLMODE_FD) {
1222		u32 reg_fdcbt, reg_ctrl2;
1223
1224		if (bt->brp != dbt->brp)
1225			netdev_warn(dev, "Data brp=%d and brp=%d don't match, this may result in a phase error. Consider using different bitrate and/or data bitrate.\n",
1226				    dbt->brp, bt->brp);
1227
1228		/* FDCBT */
1229		/* FDCBT[FPSEG1] is 3 bit long and FDCBT[FPROPSEG] is
1230		 * 5 bit long. The can_calc_bittiming tries to divide
1231		 * the tseg1 equally between phase_seg1 and prop_seg,
1232		 * which may not fit in FDCBT register. Therefore, if
1233		 * phase_seg1 is more than possible value, increase
1234		 * prop_seg and decrease phase_seg1
1235		 */
1236		if (dbt->phase_seg1 > 0x8) {
1237			dbt->prop_seg += (dbt->phase_seg1 - 0x8);
1238			dbt->phase_seg1 = 0x8;
1239		}
1240
1241		reg_fdcbt = priv->read(&regs->fdcbt);
1242		reg_fdcbt &= ~(FIELD_PREP(FLEXCAN_FDCBT_FPRESDIV_MASK, 0x3ff) |
1243			       FIELD_PREP(FLEXCAN_FDCBT_FRJW_MASK, 0x7) |
1244			       FIELD_PREP(FLEXCAN_FDCBT_FPROPSEG_MASK, 0x1f) |
1245			       FIELD_PREP(FLEXCAN_FDCBT_FPSEG1_MASK, 0x7) |
1246			       FIELD_PREP(FLEXCAN_FDCBT_FPSEG2_MASK, 0x7));
1247
1248		reg_fdcbt |= FIELD_PREP(FLEXCAN_FDCBT_FPRESDIV_MASK, dbt->brp - 1) |
1249			FIELD_PREP(FLEXCAN_FDCBT_FRJW_MASK, dbt->sjw - 1) |
1250			FIELD_PREP(FLEXCAN_FDCBT_FPROPSEG_MASK, dbt->prop_seg) |
1251			FIELD_PREP(FLEXCAN_FDCBT_FPSEG1_MASK, dbt->phase_seg1 - 1) |
1252			FIELD_PREP(FLEXCAN_FDCBT_FPSEG2_MASK, dbt->phase_seg2 - 1);
1253
1254		netdev_dbg(dev, "writing fdcbt=0x%08x\n", reg_fdcbt);
1255		priv->write(reg_fdcbt, &regs->fdcbt);
1256
1257		/* CTRL2 */
1258		reg_ctrl2 = priv->read(&regs->ctrl2);
1259		reg_ctrl2 &= ~FLEXCAN_CTRL2_ISOCANFDEN;
1260		if (!(priv->can.ctrlmode & CAN_CTRLMODE_FD_NON_ISO))
1261			reg_ctrl2 |= FLEXCAN_CTRL2_ISOCANFDEN;
1262
1263		netdev_dbg(dev, "writing ctrl2=0x%08x\n", reg_ctrl2);
1264		priv->write(reg_ctrl2, &regs->ctrl2);
1265	}
1266
1267	/* FDCTRL */
1268	reg_fdctrl = priv->read(&regs->fdctrl);
1269	reg_fdctrl &= ~(FLEXCAN_FDCTRL_FDRATE |
1270			FIELD_PREP(FLEXCAN_FDCTRL_TDCOFF, 0x1f));
1271
1272	if (priv->can.ctrlmode & CAN_CTRLMODE_FD) {
1273		reg_fdctrl |= FLEXCAN_FDCTRL_FDRATE;
1274
1275		if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK) {
1276			/* TDC must be disabled for Loop Back mode */
1277			reg_fdctrl &= ~FLEXCAN_FDCTRL_TDCEN;
1278		} else {
1279			reg_fdctrl |= FLEXCAN_FDCTRL_TDCEN |
1280				FIELD_PREP(FLEXCAN_FDCTRL_TDCOFF,
1281					   ((dbt->phase_seg1 - 1) +
1282					    dbt->prop_seg + 2) *
1283					   ((dbt->brp - 1 ) + 1));
1284		}
1285	}
1286
1287	netdev_dbg(dev, "writing fdctrl=0x%08x\n", reg_fdctrl);
1288	priv->write(reg_fdctrl, &regs->fdctrl);
1289
1290	netdev_dbg(dev, "%s: mcr=0x%08x ctrl=0x%08x ctrl2=0x%08x fdctrl=0x%08x cbt=0x%08x fdcbt=0x%08x\n",
1291		   __func__,
1292		   priv->read(&regs->mcr), priv->read(&regs->ctrl),
1293		   priv->read(&regs->ctrl2), priv->read(&regs->fdctrl),
1294		   priv->read(&regs->cbt), priv->read(&regs->fdcbt));
1295}
1296
1297static void flexcan_set_bittiming(struct net_device *dev)
1298{
1299	const struct flexcan_priv *priv = netdev_priv(dev);
1300	struct flexcan_regs __iomem *regs = priv->regs;
1301	u32 reg;
1302
1303	reg = priv->read(&regs->ctrl);
1304	reg &= ~(FLEXCAN_CTRL_LPB | FLEXCAN_CTRL_SMP |
1305		 FLEXCAN_CTRL_LOM);
1306
1307	if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK)
1308		reg |= FLEXCAN_CTRL_LPB;
1309	if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
1310		reg |= FLEXCAN_CTRL_LOM;
1311	if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
1312		reg |= FLEXCAN_CTRL_SMP;
1313
1314	netdev_dbg(dev, "writing ctrl=0x%08x\n", reg);
1315	priv->write(reg, &regs->ctrl);
1316
1317	if (priv->can.ctrlmode_supported & CAN_CTRLMODE_FD)
1318		return flexcan_set_bittiming_cbt(dev);
1319	else
1320		return flexcan_set_bittiming_ctrl(dev);
1321}
1322
1323static void flexcan_ram_init(struct net_device *dev)
1324{
1325	struct flexcan_priv *priv = netdev_priv(dev);
1326	struct flexcan_regs __iomem *regs = priv->regs;
1327	u32 reg_ctrl2;
1328
1329	/* 11.8.3.13 Detection and correction of memory errors:
1330	 * CTRL2[WRMFRZ] grants write access to all memory positions
1331	 * that require initialization, ranging from 0x080 to 0xADF
1332	 * and from 0xF28 to 0xFFF when the CAN FD feature is enabled.
1333	 * The RXMGMASK, RX14MASK, RX15MASK, and RXFGMASK registers
1334	 * need to be initialized as well. MCR[RFEN] must not be set
1335	 * during memory initialization.
1336	 */
1337	reg_ctrl2 = priv->read(&regs->ctrl2);
1338	reg_ctrl2 |= FLEXCAN_CTRL2_WRMFRZ;
1339	priv->write(reg_ctrl2, &regs->ctrl2);
1340
1341	memset_io(&regs->init, 0, sizeof(regs->init));
1342
1343	if (priv->can.ctrlmode & CAN_CTRLMODE_FD)
1344		memset_io(&regs->init_fd, 0, sizeof(regs->init_fd));
1345
1346	reg_ctrl2 &= ~FLEXCAN_CTRL2_WRMFRZ;
1347	priv->write(reg_ctrl2, &regs->ctrl2);
1348}
1349
1350static int flexcan_rx_offload_setup(struct net_device *dev)
1351{
1352	struct flexcan_priv *priv = netdev_priv(dev);
1353	int err;
1354
1355	if (priv->can.ctrlmode & CAN_CTRLMODE_FD)
1356		priv->mb_size = sizeof(struct flexcan_mb) + CANFD_MAX_DLEN;
1357	else
1358		priv->mb_size = sizeof(struct flexcan_mb) + CAN_MAX_DLEN;
1359
1360	if (priv->devtype_data.quirks & FLEXCAN_QUIRK_NR_MB_16)
1361		priv->mb_count = 16;
1362	else
1363		priv->mb_count = (sizeof(priv->regs->mb[0]) / priv->mb_size) +
1364				 (sizeof(priv->regs->mb[1]) / priv->mb_size);
1365
1366	if (priv->devtype_data.quirks & FLEXCAN_QUIRK_USE_RX_MAILBOX)
1367		priv->tx_mb_reserved =
1368			flexcan_get_mb(priv, FLEXCAN_TX_MB_RESERVED_RX_MAILBOX);
1369	else
1370		priv->tx_mb_reserved =
1371			flexcan_get_mb(priv, FLEXCAN_TX_MB_RESERVED_RX_FIFO);
1372	priv->tx_mb_idx = priv->mb_count - 1;
1373	priv->tx_mb = flexcan_get_mb(priv, priv->tx_mb_idx);
1374	priv->tx_mask = FLEXCAN_IFLAG_MB(priv->tx_mb_idx);
1375
1376	priv->offload.mailbox_read = flexcan_mailbox_read;
1377
1378	if (priv->devtype_data.quirks & FLEXCAN_QUIRK_USE_RX_MAILBOX) {
1379		priv->offload.mb_first = FLEXCAN_RX_MB_RX_MAILBOX_FIRST;
1380		priv->offload.mb_last = priv->mb_count - 2;
1381
1382		priv->rx_mask = GENMASK_ULL(priv->offload.mb_last,
1383					    priv->offload.mb_first);
1384		err = can_rx_offload_add_timestamp(dev, &priv->offload);
1385	} else {
1386		priv->rx_mask = FLEXCAN_IFLAG_RX_FIFO_OVERFLOW |
1387			FLEXCAN_IFLAG_RX_FIFO_AVAILABLE;
1388		err = can_rx_offload_add_fifo(dev, &priv->offload,
1389					      FLEXCAN_NAPI_WEIGHT);
1390	}
1391
1392	return err;
1393}
1394
1395static void flexcan_chip_interrupts_enable(const struct net_device *dev)
1396{
1397	const struct flexcan_priv *priv = netdev_priv(dev);
1398	struct flexcan_regs __iomem *regs = priv->regs;
1399	u64 reg_imask;
1400
1401	disable_irq(dev->irq);
1402	priv->write(priv->reg_ctrl_default, &regs->ctrl);
1403	reg_imask = priv->rx_mask | priv->tx_mask;
1404	priv->write(upper_32_bits(reg_imask), &regs->imask2);
1405	priv->write(lower_32_bits(reg_imask), &regs->imask1);
1406	enable_irq(dev->irq);
1407}
1408
1409static void flexcan_chip_interrupts_disable(const struct net_device *dev)
1410{
1411	const struct flexcan_priv *priv = netdev_priv(dev);
1412	struct flexcan_regs __iomem *regs = priv->regs;
1413
1414	priv->write(0, &regs->imask2);
1415	priv->write(0, &regs->imask1);
1416	priv->write(priv->reg_ctrl_default & ~FLEXCAN_CTRL_ERR_ALL,
1417		    &regs->ctrl);
1418}
1419
1420/* flexcan_chip_start
1421 *
1422 * this functions is entered with clocks enabled
1423 *
1424 */
1425static int flexcan_chip_start(struct net_device *dev)
1426{
1427	struct flexcan_priv *priv = netdev_priv(dev);
1428	struct flexcan_regs __iomem *regs = priv->regs;
1429	u32 reg_mcr, reg_ctrl, reg_ctrl2, reg_mecr;
1430	int err, i;
1431	struct flexcan_mb __iomem *mb;
1432
1433	/* enable module */
1434	err = flexcan_chip_enable(priv);
1435	if (err)
1436		return err;
1437
1438	/* soft reset */
1439	err = flexcan_chip_softreset(priv);
1440	if (err)
1441		goto out_chip_disable;
1442
1443	if (priv->devtype_data.quirks & FLEXCAN_QUIRK_SUPPORT_ECC)
1444		flexcan_ram_init(dev);
1445
1446	flexcan_set_bittiming(dev);
1447
1448	/* set freeze, halt */
1449	err = flexcan_chip_freeze(priv);
1450	if (err)
1451		goto out_chip_disable;
1452
1453	/* MCR
1454	 *
1455	 * only supervisor access
1456	 * enable warning int
1457	 * enable individual RX masking
1458	 * choose format C
1459	 * set max mailbox number
1460	 */
1461	reg_mcr = priv->read(&regs->mcr);
1462	reg_mcr &= ~FLEXCAN_MCR_MAXMB(0xff);
1463	reg_mcr |= FLEXCAN_MCR_SUPV | FLEXCAN_MCR_WRN_EN | FLEXCAN_MCR_IRMQ |
1464		FLEXCAN_MCR_IDAM_C | FLEXCAN_MCR_MAXMB(priv->tx_mb_idx);
1465
1466	/* MCR
1467	 *
1468	 * FIFO:
1469	 * - disable for mailbox mode
1470	 * - enable for FIFO mode
1471	 */
1472	if (priv->devtype_data.quirks & FLEXCAN_QUIRK_USE_RX_MAILBOX)
1473		reg_mcr &= ~FLEXCAN_MCR_FEN;
1474	else
1475		reg_mcr |= FLEXCAN_MCR_FEN;
1476
1477	/* MCR
1478	 *
1479	 * NOTE: In loopback mode, the CAN_MCR[SRXDIS] cannot be
1480	 *       asserted because this will impede the self reception
1481	 *       of a transmitted message. This is not documented in
1482	 *       earlier versions of flexcan block guide.
1483	 *
1484	 * Self Reception:
1485	 * - enable Self Reception for loopback mode
1486	 *   (by clearing "Self Reception Disable" bit)
1487	 * - disable for normal operation
1488	 */
1489	if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK)
1490		reg_mcr &= ~FLEXCAN_MCR_SRX_DIS;
1491	else
1492		reg_mcr |= FLEXCAN_MCR_SRX_DIS;
1493
1494	/* MCR - CAN-FD */
1495	if (priv->can.ctrlmode & CAN_CTRLMODE_FD)
1496		reg_mcr |= FLEXCAN_MCR_FDEN;
1497	else
1498		reg_mcr &= ~FLEXCAN_MCR_FDEN;
1499
1500	netdev_dbg(dev, "%s: writing mcr=0x%08x", __func__, reg_mcr);
1501	priv->write(reg_mcr, &regs->mcr);
1502
1503	/* CTRL
1504	 *
1505	 * disable timer sync feature
1506	 *
1507	 * disable auto busoff recovery
1508	 * transmit lowest buffer first
1509	 *
1510	 * enable tx and rx warning interrupt
1511	 * enable bus off interrupt
1512	 * (== FLEXCAN_CTRL_ERR_STATE)
1513	 */
1514	reg_ctrl = priv->read(&regs->ctrl);
1515	reg_ctrl &= ~FLEXCAN_CTRL_TSYN;
1516	reg_ctrl |= FLEXCAN_CTRL_BOFF_REC | FLEXCAN_CTRL_LBUF |
1517		FLEXCAN_CTRL_ERR_STATE;
1518
1519	/* enable the "error interrupt" (FLEXCAN_CTRL_ERR_MSK),
1520	 * on most Flexcan cores, too. Otherwise we don't get
1521	 * any error warning or passive interrupts.
1522	 */
1523	if (priv->devtype_data.quirks & FLEXCAN_QUIRK_BROKEN_WERR_STATE ||
1524	    priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)
1525		reg_ctrl |= FLEXCAN_CTRL_ERR_MSK;
1526	else
1527		reg_ctrl &= ~FLEXCAN_CTRL_ERR_MSK;
1528
1529	/* save for later use */
1530	priv->reg_ctrl_default = reg_ctrl;
1531	/* leave interrupts disabled for now */
1532	reg_ctrl &= ~FLEXCAN_CTRL_ERR_ALL;
1533	netdev_dbg(dev, "%s: writing ctrl=0x%08x", __func__, reg_ctrl);
1534	priv->write(reg_ctrl, &regs->ctrl);
1535
1536	if ((priv->devtype_data.quirks & FLEXCAN_QUIRK_ENABLE_EACEN_RRS)) {
1537		reg_ctrl2 = priv->read(&regs->ctrl2);
1538		reg_ctrl2 |= FLEXCAN_CTRL2_EACEN | FLEXCAN_CTRL2_RRS;
1539		priv->write(reg_ctrl2, &regs->ctrl2);
1540	}
1541
1542	if (priv->can.ctrlmode_supported & CAN_CTRLMODE_FD) {
1543		u32 reg_fdctrl;
1544
1545		reg_fdctrl = priv->read(&regs->fdctrl);
1546		reg_fdctrl &= ~(FIELD_PREP(FLEXCAN_FDCTRL_MBDSR1, 0x3) |
1547				FIELD_PREP(FLEXCAN_FDCTRL_MBDSR0, 0x3));
1548
1549		if (priv->can.ctrlmode & CAN_CTRLMODE_FD) {
1550			reg_fdctrl |=
1551				FIELD_PREP(FLEXCAN_FDCTRL_MBDSR1,
1552					   FLEXCAN_FDCTRL_MBDSR_64) |
1553				FIELD_PREP(FLEXCAN_FDCTRL_MBDSR0,
1554					   FLEXCAN_FDCTRL_MBDSR_64);
1555		} else {
1556			reg_fdctrl |=
1557				FIELD_PREP(FLEXCAN_FDCTRL_MBDSR1,
1558					   FLEXCAN_FDCTRL_MBDSR_8) |
1559				FIELD_PREP(FLEXCAN_FDCTRL_MBDSR0,
1560					   FLEXCAN_FDCTRL_MBDSR_8);
1561		}
1562
1563		netdev_dbg(dev, "%s: writing fdctrl=0x%08x",
1564			   __func__, reg_fdctrl);
1565		priv->write(reg_fdctrl, &regs->fdctrl);
1566	}
1567
1568	if (priv->devtype_data.quirks & FLEXCAN_QUIRK_USE_RX_MAILBOX) {
1569		for (i = priv->offload.mb_first; i <= priv->offload.mb_last; i++) {
1570			mb = flexcan_get_mb(priv, i);
1571			priv->write(FLEXCAN_MB_CODE_RX_EMPTY,
1572				    &mb->can_ctrl);
1573		}
1574	} else {
1575		/* clear and invalidate unused mailboxes first */
1576		for (i = FLEXCAN_TX_MB_RESERVED_RX_FIFO; i < priv->mb_count; i++) {
1577			mb = flexcan_get_mb(priv, i);
1578			priv->write(FLEXCAN_MB_CODE_RX_INACTIVE,
1579				    &mb->can_ctrl);
1580		}
1581	}
1582
1583	/* Errata ERR005829: mark first TX mailbox as INACTIVE */
1584	priv->write(FLEXCAN_MB_CODE_TX_INACTIVE,
1585		    &priv->tx_mb_reserved->can_ctrl);
1586
1587	/* mark TX mailbox as INACTIVE */
1588	priv->write(FLEXCAN_MB_CODE_TX_INACTIVE,
1589		    &priv->tx_mb->can_ctrl);
1590
1591	/* acceptance mask/acceptance code (accept everything) */
1592	priv->write(0x0, &regs->rxgmask);
1593	priv->write(0x0, &regs->rx14mask);
1594	priv->write(0x0, &regs->rx15mask);
1595
1596	if (priv->devtype_data.quirks & FLEXCAN_QUIRK_DISABLE_RXFG)
1597		priv->write(0x0, &regs->rxfgmask);
1598
1599	/* clear acceptance filters */
1600	for (i = 0; i < priv->mb_count; i++)
1601		priv->write(0, &regs->rximr[i]);
1602
1603	/* On Vybrid, disable non-correctable errors interrupt and
1604	 * freeze mode. It still can correct the correctable errors
1605	 * when HW supports ECC.
1606	 *
1607	 * This also works around errata e5295 which generates false
1608	 * positive memory errors and put the device in freeze mode.
1609	 */
1610	if (priv->devtype_data.quirks & FLEXCAN_QUIRK_DISABLE_MECR) {
1611		/* Follow the protocol as described in "Detection
1612		 * and Correction of Memory Errors" to write to
1613		 * MECR register (step 1 - 5)
1614		 *
1615		 * 1. By default, CTRL2[ECRWRE] = 0, MECR[ECRWRDIS] = 1
1616		 * 2. set CTRL2[ECRWRE]
1617		 */
1618		reg_ctrl2 = priv->read(&regs->ctrl2);
1619		reg_ctrl2 |= FLEXCAN_CTRL2_ECRWRE;
1620		priv->write(reg_ctrl2, &regs->ctrl2);
1621
1622		/* 3. clear MECR[ECRWRDIS] */
1623		reg_mecr = priv->read(&regs->mecr);
1624		reg_mecr &= ~FLEXCAN_MECR_ECRWRDIS;
1625		priv->write(reg_mecr, &regs->mecr);
1626
1627		/* 4. all writes to MECR must keep MECR[ECRWRDIS] cleared */
1628		reg_mecr &= ~(FLEXCAN_MECR_NCEFAFRZ | FLEXCAN_MECR_HANCEI_MSK |
1629			      FLEXCAN_MECR_FANCEI_MSK);
1630		priv->write(reg_mecr, &regs->mecr);
1631
1632		/* 5. after configuration done, lock MECR by either
1633		 * setting MECR[ECRWRDIS] or clearing CTRL2[ECRWRE]
1634		 */
1635		reg_mecr |= FLEXCAN_MECR_ECRWRDIS;
1636		priv->write(reg_mecr, &regs->mecr);
1637
1638		reg_ctrl2 &= ~FLEXCAN_CTRL2_ECRWRE;
1639		priv->write(reg_ctrl2, &regs->ctrl2);
1640	}
1641
1642	/* synchronize with the can bus */
1643	err = flexcan_chip_unfreeze(priv);
1644	if (err)
1645		goto out_chip_disable;
1646
1647	priv->can.state = CAN_STATE_ERROR_ACTIVE;
1648
1649	/* print chip status */
1650	netdev_dbg(dev, "%s: reading mcr=0x%08x ctrl=0x%08x\n", __func__,
1651		   priv->read(&regs->mcr), priv->read(&regs->ctrl));
1652
1653	return 0;
1654
1655 out_chip_disable:
1656	flexcan_chip_disable(priv);
1657	return err;
1658}
1659
1660/* __flexcan_chip_stop
1661 *
1662 * this function is entered with clocks enabled
1663 */
1664static int __flexcan_chip_stop(struct net_device *dev, bool disable_on_error)
1665{
1666	struct flexcan_priv *priv = netdev_priv(dev);
1667	int err;
1668
1669	/* freeze + disable module */
1670	err = flexcan_chip_freeze(priv);
1671	if (err && !disable_on_error)
1672		return err;
1673	err = flexcan_chip_disable(priv);
1674	if (err && !disable_on_error)
1675		goto out_chip_unfreeze;
1676
1677	priv->can.state = CAN_STATE_STOPPED;
1678
1679	return 0;
1680
1681 out_chip_unfreeze:
1682	flexcan_chip_unfreeze(priv);
1683
1684	return err;
1685}
1686
1687static inline int flexcan_chip_stop_disable_on_error(struct net_device *dev)
1688{
1689	return __flexcan_chip_stop(dev, true);
1690}
1691
1692static inline int flexcan_chip_stop(struct net_device *dev)
1693{
1694	return __flexcan_chip_stop(dev, false);
1695}
1696
1697static int flexcan_open(struct net_device *dev)
1698{
1699	struct flexcan_priv *priv = netdev_priv(dev);
1700	int err;
1701
1702	if ((priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) &&
1703	    (priv->can.ctrlmode & CAN_CTRLMODE_FD)) {
1704		netdev_err(dev, "Three Samples mode and CAN-FD mode can't be used together\n");
1705		return -EINVAL;
1706	}
1707
1708	err = pm_runtime_resume_and_get(priv->dev);
1709	if (err < 0)
1710		return err;
1711
1712	err = open_candev(dev);
1713	if (err)
1714		goto out_runtime_put;
1715
1716	err = flexcan_transceiver_enable(priv);
1717	if (err)
1718		goto out_close;
1719
1720	err = flexcan_rx_offload_setup(dev);
1721	if (err)
1722		goto out_transceiver_disable;
1723
1724	err = flexcan_chip_start(dev);
1725	if (err)
1726		goto out_can_rx_offload_del;
1727
1728	can_rx_offload_enable(&priv->offload);
1729
1730	err = request_irq(dev->irq, flexcan_irq, IRQF_SHARED, dev->name, dev);
1731	if (err)
1732		goto out_can_rx_offload_disable;
1733
1734	if (priv->devtype_data.quirks & FLEXCAN_QUIRK_NR_IRQ_3) {
1735		err = request_irq(priv->irq_boff,
1736				  flexcan_irq, IRQF_SHARED, dev->name, dev);
1737		if (err)
1738			goto out_free_irq;
1739
1740		err = request_irq(priv->irq_err,
1741				  flexcan_irq, IRQF_SHARED, dev->name, dev);
1742		if (err)
1743			goto out_free_irq_boff;
1744	}
1745
1746	flexcan_chip_interrupts_enable(dev);
1747
1748	netif_start_queue(dev);
1749
1750	return 0;
1751
1752 out_free_irq_boff:
1753	free_irq(priv->irq_boff, dev);
1754 out_free_irq:
1755	free_irq(dev->irq, dev);
1756 out_can_rx_offload_disable:
1757	can_rx_offload_disable(&priv->offload);
1758	flexcan_chip_stop(dev);
1759 out_can_rx_offload_del:
1760	can_rx_offload_del(&priv->offload);
1761 out_transceiver_disable:
1762	flexcan_transceiver_disable(priv);
1763 out_close:
1764	close_candev(dev);
1765 out_runtime_put:
1766	pm_runtime_put(priv->dev);
1767
1768	return err;
1769}
1770
1771static int flexcan_close(struct net_device *dev)
1772{
1773	struct flexcan_priv *priv = netdev_priv(dev);
1774
1775	netif_stop_queue(dev);
1776	flexcan_chip_interrupts_disable(dev);
1777
1778	if (priv->devtype_data.quirks & FLEXCAN_QUIRK_NR_IRQ_3) {
1779		free_irq(priv->irq_err, dev);
1780		free_irq(priv->irq_boff, dev);
1781	}
1782
1783	free_irq(dev->irq, dev);
1784	can_rx_offload_disable(&priv->offload);
1785	flexcan_chip_stop_disable_on_error(dev);
1786
1787	can_rx_offload_del(&priv->offload);
1788	flexcan_transceiver_disable(priv);
1789	close_candev(dev);
1790
1791	pm_runtime_put(priv->dev);
1792
1793	return 0;
1794}
1795
1796static int flexcan_set_mode(struct net_device *dev, enum can_mode mode)
1797{
1798	int err;
1799
1800	switch (mode) {
1801	case CAN_MODE_START:
1802		err = flexcan_chip_start(dev);
1803		if (err)
1804			return err;
1805
1806		flexcan_chip_interrupts_enable(dev);
1807
1808		netif_wake_queue(dev);
1809		break;
1810
1811	default:
1812		return -EOPNOTSUPP;
1813	}
1814
1815	return 0;
1816}
1817
1818static const struct net_device_ops flexcan_netdev_ops = {
1819	.ndo_open	= flexcan_open,
1820	.ndo_stop	= flexcan_close,
1821	.ndo_start_xmit	= flexcan_start_xmit,
1822	.ndo_change_mtu = can_change_mtu,
1823};
1824
1825static int register_flexcandev(struct net_device *dev)
1826{
1827	struct flexcan_priv *priv = netdev_priv(dev);
1828	struct flexcan_regs __iomem *regs = priv->regs;
1829	u32 reg, err;
1830
1831	err = flexcan_clks_enable(priv);
1832	if (err)
1833		return err;
1834
1835	/* select "bus clock", chip must be disabled */
1836	err = flexcan_chip_disable(priv);
1837	if (err)
1838		goto out_clks_disable;
1839
1840	reg = priv->read(&regs->ctrl);
1841	if (priv->clk_src)
1842		reg |= FLEXCAN_CTRL_CLK_SRC;
1843	else
1844		reg &= ~FLEXCAN_CTRL_CLK_SRC;
1845	priv->write(reg, &regs->ctrl);
1846
1847	err = flexcan_chip_enable(priv);
1848	if (err)
1849		goto out_chip_disable;
1850
1851	/* set freeze, halt */
1852	err = flexcan_chip_freeze(priv);
1853	if (err)
1854		goto out_chip_disable;
1855
1856	/* activate FIFO, restrict register access */
1857	reg = priv->read(&regs->mcr);
1858	reg |=  FLEXCAN_MCR_FEN | FLEXCAN_MCR_SUPV;
1859	priv->write(reg, &regs->mcr);
1860
1861	/* Currently we only support newer versions of this core
1862	 * featuring a RX hardware FIFO (although this driver doesn't
1863	 * make use of it on some cores). Older cores, found on some
1864	 * Coldfire derivates are not tested.
1865	 */
1866	reg = priv->read(&regs->mcr);
1867	if (!(reg & FLEXCAN_MCR_FEN)) {
1868		netdev_err(dev, "Could not enable RX FIFO, unsupported core\n");
1869		err = -ENODEV;
1870		goto out_chip_disable;
1871	}
1872
1873	err = register_candev(dev);
1874	if (err)
1875		goto out_chip_disable;
1876
1877	/* Disable core and let pm_runtime_put() disable the clocks.
1878	 * If CONFIG_PM is not enabled, the clocks will stay powered.
1879	 */
1880	flexcan_chip_disable(priv);
1881	pm_runtime_put(priv->dev);
1882
1883	return 0;
1884
1885 out_chip_disable:
1886	flexcan_chip_disable(priv);
1887 out_clks_disable:
1888	flexcan_clks_disable(priv);
1889	return err;
1890}
1891
1892static void unregister_flexcandev(struct net_device *dev)
1893{
1894	unregister_candev(dev);
1895}
1896
1897static int flexcan_setup_stop_mode_gpr(struct platform_device *pdev)
1898{
1899	struct net_device *dev = platform_get_drvdata(pdev);
1900	struct device_node *np = pdev->dev.of_node;
1901	struct device_node *gpr_np;
1902	struct flexcan_priv *priv;
1903	phandle phandle;
1904	u32 out_val[3];
1905	int ret;
1906
1907	if (!np)
1908		return -EINVAL;
1909
1910	/* stop mode property format is:
1911	 * <&gpr req_gpr req_bit>.
1912	 */
1913	ret = of_property_read_u32_array(np, "fsl,stop-mode", out_val,
1914					 ARRAY_SIZE(out_val));
1915	if (ret) {
1916		dev_dbg(&pdev->dev, "no stop-mode property\n");
1917		return ret;
1918	}
1919	phandle = *out_val;
1920
1921	gpr_np = of_find_node_by_phandle(phandle);
1922	if (!gpr_np) {
1923		dev_dbg(&pdev->dev, "could not find gpr node by phandle\n");
1924		return -ENODEV;
1925	}
1926
1927	priv = netdev_priv(dev);
1928	priv->stm.gpr = syscon_node_to_regmap(gpr_np);
1929	if (IS_ERR(priv->stm.gpr)) {
1930		dev_dbg(&pdev->dev, "could not find gpr regmap\n");
1931		ret = PTR_ERR(priv->stm.gpr);
1932		goto out_put_node;
1933	}
1934
1935	priv->stm.req_gpr = out_val[1];
1936	priv->stm.req_bit = out_val[2];
1937
1938	dev_dbg(&pdev->dev,
1939		"gpr %s req_gpr=0x02%x req_bit=%u\n",
1940		gpr_np->full_name, priv->stm.req_gpr, priv->stm.req_bit);
1941
1942	return 0;
1943
1944out_put_node:
1945	of_node_put(gpr_np);
1946	return ret;
1947}
1948
1949static int flexcan_setup_stop_mode_scfw(struct platform_device *pdev)
1950{
1951	struct net_device *dev = platform_get_drvdata(pdev);
1952	struct flexcan_priv *priv;
1953	u8 scu_idx;
1954	int ret;
1955
1956	ret = of_property_read_u8(pdev->dev.of_node, "fsl,scu-index", &scu_idx);
1957	if (ret < 0) {
1958		dev_dbg(&pdev->dev, "failed to get scu index\n");
1959		return ret;
1960	}
1961
1962	priv = netdev_priv(dev);
1963	priv->scu_idx = scu_idx;
1964
1965	/* this function could be deferred probe, return -EPROBE_DEFER */
1966	return imx_scu_get_handle(&priv->sc_ipc_handle);
1967}
1968
1969/* flexcan_setup_stop_mode - Setup stop mode for wakeup
1970 *
1971 * Return: = 0 setup stop mode successfully or doesn't support this feature
1972 *         < 0 fail to setup stop mode (could be deferred probe)
1973 */
1974static int flexcan_setup_stop_mode(struct platform_device *pdev)
1975{
1976	struct net_device *dev = platform_get_drvdata(pdev);
1977	struct flexcan_priv *priv;
1978	int ret;
1979
1980	priv = netdev_priv(dev);
1981
1982	if (priv->devtype_data.quirks & FLEXCAN_QUIRK_SETUP_STOP_MODE_SCFW)
1983		ret = flexcan_setup_stop_mode_scfw(pdev);
1984	else if (priv->devtype_data.quirks & FLEXCAN_QUIRK_SETUP_STOP_MODE_GPR)
1985		ret = flexcan_setup_stop_mode_gpr(pdev);
 
 
1986	else
1987		/* return 0 directly if doesn't support stop mode feature */
1988		return 0;
1989
1990	/* If ret is -EINVAL, this means SoC claim to support stop mode, but
1991	 * dts file lack the stop mode property definition. For this case,
1992	 * directly return 0, this will skip the wakeup capable setting and
1993	 * will not block the driver probe.
1994	 */
1995	if (ret == -EINVAL)
1996		return 0;
1997	else if (ret)
1998		return ret;
1999
2000	device_set_wakeup_capable(&pdev->dev, true);
2001
2002	if (of_property_read_bool(pdev->dev.of_node, "wakeup-source"))
2003		device_set_wakeup_enable(&pdev->dev, true);
2004
2005	return 0;
2006}
2007
2008static const struct of_device_id flexcan_of_match[] = {
2009	{ .compatible = "fsl,imx8qm-flexcan", .data = &fsl_imx8qm_devtype_data, },
2010	{ .compatible = "fsl,imx8mp-flexcan", .data = &fsl_imx8mp_devtype_data, },
2011	{ .compatible = "fsl,imx93-flexcan", .data = &fsl_imx93_devtype_data, },
2012	{ .compatible = "fsl,imx6q-flexcan", .data = &fsl_imx6q_devtype_data, },
2013	{ .compatible = "fsl,imx28-flexcan", .data = &fsl_imx28_devtype_data, },
2014	{ .compatible = "fsl,imx53-flexcan", .data = &fsl_imx25_devtype_data, },
2015	{ .compatible = "fsl,imx35-flexcan", .data = &fsl_imx25_devtype_data, },
2016	{ .compatible = "fsl,imx25-flexcan", .data = &fsl_imx25_devtype_data, },
2017	{ .compatible = "fsl,p1010-flexcan", .data = &fsl_p1010_devtype_data, },
2018	{ .compatible = "fsl,vf610-flexcan", .data = &fsl_vf610_devtype_data, },
2019	{ .compatible = "fsl,ls1021ar2-flexcan", .data = &fsl_ls1021a_r2_devtype_data, },
2020	{ .compatible = "fsl,lx2160ar1-flexcan", .data = &fsl_lx2160a_r1_devtype_data, },
2021	{ /* sentinel */ },
2022};
2023MODULE_DEVICE_TABLE(of, flexcan_of_match);
2024
2025static const struct platform_device_id flexcan_id_table[] = {
2026	{
2027		.name = "flexcan-mcf5441x",
2028		.driver_data = (kernel_ulong_t)&fsl_mcf5441x_devtype_data,
2029	}, {
2030		/* sentinel */
2031	},
2032};
2033MODULE_DEVICE_TABLE(platform, flexcan_id_table);
2034
2035static int flexcan_probe(struct platform_device *pdev)
2036{
 
2037	const struct flexcan_devtype_data *devtype_data;
2038	struct net_device *dev;
2039	struct flexcan_priv *priv;
2040	struct regulator *reg_xceiver;
2041	struct clk *clk_ipg = NULL, *clk_per = NULL;
2042	struct flexcan_regs __iomem *regs;
2043	struct flexcan_platform_data *pdata;
2044	int err, irq;
2045	u8 clk_src = 1;
2046	u32 clock_freq = 0;
2047
2048	reg_xceiver = devm_regulator_get_optional(&pdev->dev, "xceiver");
2049	if (PTR_ERR(reg_xceiver) == -EPROBE_DEFER)
2050		return -EPROBE_DEFER;
2051	else if (PTR_ERR(reg_xceiver) == -ENODEV)
2052		reg_xceiver = NULL;
2053	else if (IS_ERR(reg_xceiver))
2054		return PTR_ERR(reg_xceiver);
2055
2056	if (pdev->dev.of_node) {
2057		of_property_read_u32(pdev->dev.of_node,
2058				     "clock-frequency", &clock_freq);
2059		of_property_read_u8(pdev->dev.of_node,
2060				    "fsl,clk-source", &clk_src);
2061	} else {
2062		pdata = dev_get_platdata(&pdev->dev);
2063		if (pdata) {
2064			clock_freq = pdata->clock_frequency;
2065			clk_src = pdata->clk_src;
2066		}
2067	}
2068
2069	if (!clock_freq) {
2070		clk_ipg = devm_clk_get(&pdev->dev, "ipg");
2071		if (IS_ERR(clk_ipg)) {
2072			dev_err(&pdev->dev, "no ipg clock defined\n");
2073			return PTR_ERR(clk_ipg);
2074		}
2075
2076		clk_per = devm_clk_get(&pdev->dev, "per");
2077		if (IS_ERR(clk_per)) {
2078			dev_err(&pdev->dev, "no per clock defined\n");
2079			return PTR_ERR(clk_per);
2080		}
2081		clock_freq = clk_get_rate(clk_per);
2082	}
2083
2084	irq = platform_get_irq(pdev, 0);
2085	if (irq < 0)
2086		return irq;
2087
2088	regs = devm_platform_ioremap_resource(pdev, 0);
2089	if (IS_ERR(regs))
2090		return PTR_ERR(regs);
2091
2092	devtype_data = device_get_match_data(&pdev->dev);
 
 
 
 
 
 
 
2093
2094	if ((devtype_data->quirks & FLEXCAN_QUIRK_SUPPORT_FD) &&
2095	    !((devtype_data->quirks &
2096	       (FLEXCAN_QUIRK_USE_RX_MAILBOX |
2097		FLEXCAN_QUIRK_SUPPORT_RX_MAILBOX |
2098		FLEXCAN_QUIRK_SUPPORT_RX_MAILBOX_RTR |
2099		FLEXCAN_QUIRK_SUPPORT_RX_FIFO)) ==
2100	      (FLEXCAN_QUIRK_USE_RX_MAILBOX |
2101	       FLEXCAN_QUIRK_SUPPORT_RX_MAILBOX |
2102	       FLEXCAN_QUIRK_SUPPORT_RX_MAILBOX_RTR))) {
2103		dev_err(&pdev->dev, "CAN-FD mode doesn't work in RX-FIFO mode!\n");
2104		return -EINVAL;
2105	}
2106
2107	if ((devtype_data->quirks &
2108	     (FLEXCAN_QUIRK_SUPPORT_RX_MAILBOX |
2109	      FLEXCAN_QUIRK_SUPPORT_RX_MAILBOX_RTR)) ==
2110	    FLEXCAN_QUIRK_SUPPORT_RX_MAILBOX_RTR) {
2111		dev_err(&pdev->dev,
2112			"Quirks (0x%08x) inconsistent: RX_MAILBOX_RX supported but not RX_MAILBOX\n",
2113			devtype_data->quirks);
2114		return -EINVAL;
2115	}
2116
2117	dev = alloc_candev(sizeof(struct flexcan_priv), 1);
2118	if (!dev)
2119		return -ENOMEM;
2120
2121	platform_set_drvdata(pdev, dev);
2122	SET_NETDEV_DEV(dev, &pdev->dev);
2123
2124	dev->netdev_ops = &flexcan_netdev_ops;
2125	dev->ethtool_ops = &flexcan_ethtool_ops;
2126	dev->irq = irq;
2127	dev->flags |= IFF_ECHO;
2128
2129	priv = netdev_priv(dev);
2130	priv->devtype_data = *devtype_data;
2131
2132	if (of_property_read_bool(pdev->dev.of_node, "big-endian") ||
2133	    priv->devtype_data.quirks & FLEXCAN_QUIRK_DEFAULT_BIG_ENDIAN) {
2134		priv->read = flexcan_read_be;
2135		priv->write = flexcan_write_be;
2136	} else {
2137		priv->read = flexcan_read_le;
2138		priv->write = flexcan_write_le;
2139	}
2140
2141	priv->dev = &pdev->dev;
2142	priv->can.clock.freq = clock_freq;
2143	priv->can.do_set_mode = flexcan_set_mode;
2144	priv->can.do_get_berr_counter = flexcan_get_berr_counter;
2145	priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK |
2146		CAN_CTRLMODE_LISTENONLY	| CAN_CTRLMODE_3_SAMPLES |
2147		CAN_CTRLMODE_BERR_REPORTING;
2148	priv->regs = regs;
2149	priv->clk_ipg = clk_ipg;
2150	priv->clk_per = clk_per;
2151	priv->clk_src = clk_src;
2152	priv->reg_xceiver = reg_xceiver;
2153
2154	if (priv->devtype_data.quirks & FLEXCAN_QUIRK_NR_IRQ_3) {
2155		priv->irq_boff = platform_get_irq(pdev, 1);
2156		if (priv->irq_boff < 0) {
2157			err = priv->irq_boff;
2158			goto failed_platform_get_irq;
2159		}
2160		priv->irq_err = platform_get_irq(pdev, 2);
2161		if (priv->irq_err < 0) {
2162			err = priv->irq_err;
2163			goto failed_platform_get_irq;
2164		}
2165	}
2166
2167	if (priv->devtype_data.quirks & FLEXCAN_QUIRK_SUPPORT_FD) {
2168		priv->can.ctrlmode_supported |= CAN_CTRLMODE_FD |
2169			CAN_CTRLMODE_FD_NON_ISO;
2170		priv->can.bittiming_const = &flexcan_fd_bittiming_const;
2171		priv->can.data_bittiming_const =
2172			&flexcan_fd_data_bittiming_const;
2173	} else {
2174		priv->can.bittiming_const = &flexcan_bittiming_const;
2175	}
2176
2177	pm_runtime_get_noresume(&pdev->dev);
2178	pm_runtime_set_active(&pdev->dev);
2179	pm_runtime_enable(&pdev->dev);
2180
2181	err = register_flexcandev(dev);
2182	if (err) {
2183		dev_err(&pdev->dev, "registering netdev failed\n");
2184		goto failed_register;
2185	}
2186
2187	err = flexcan_setup_stop_mode(pdev);
2188	if (err < 0) {
2189		dev_err_probe(&pdev->dev, err, "setup stop mode failed\n");
2190		goto failed_setup_stop_mode;
2191	}
2192
2193	of_can_transceiver(dev);
2194
2195	return 0;
2196
2197 failed_setup_stop_mode:
2198	unregister_flexcandev(dev);
2199 failed_register:
2200	pm_runtime_put_noidle(&pdev->dev);
2201	pm_runtime_disable(&pdev->dev);
2202 failed_platform_get_irq:
2203	free_candev(dev);
2204	return err;
2205}
2206
2207static void flexcan_remove(struct platform_device *pdev)
2208{
2209	struct net_device *dev = platform_get_drvdata(pdev);
2210
2211	device_set_wakeup_enable(&pdev->dev, false);
2212	device_set_wakeup_capable(&pdev->dev, false);
2213	unregister_flexcandev(dev);
2214	pm_runtime_disable(&pdev->dev);
2215	free_candev(dev);
 
 
2216}
2217
2218static int __maybe_unused flexcan_suspend(struct device *device)
2219{
2220	struct net_device *dev = dev_get_drvdata(device);
2221	struct flexcan_priv *priv = netdev_priv(dev);
2222	int err;
2223
2224	if (netif_running(dev)) {
2225		/* if wakeup is enabled, enter stop mode
2226		 * else enter disabled mode.
2227		 */
2228		if (device_may_wakeup(device)) {
2229			enable_irq_wake(dev->irq);
2230			err = flexcan_enter_stop_mode(priv);
2231			if (err)
2232				return err;
2233		} else {
2234			err = flexcan_chip_stop(dev);
2235			if (err)
2236				return err;
2237
2238			flexcan_chip_interrupts_disable(dev);
2239
2240			err = pinctrl_pm_select_sleep_state(device);
2241			if (err)
2242				return err;
2243		}
2244		netif_stop_queue(dev);
2245		netif_device_detach(dev);
2246	}
2247	priv->can.state = CAN_STATE_SLEEPING;
2248
2249	return 0;
2250}
2251
2252static int __maybe_unused flexcan_resume(struct device *device)
2253{
2254	struct net_device *dev = dev_get_drvdata(device);
2255	struct flexcan_priv *priv = netdev_priv(dev);
2256	int err;
2257
2258	priv->can.state = CAN_STATE_ERROR_ACTIVE;
2259	if (netif_running(dev)) {
2260		netif_device_attach(dev);
2261		netif_start_queue(dev);
2262		if (device_may_wakeup(device)) {
2263			disable_irq_wake(dev->irq);
2264			err = flexcan_exit_stop_mode(priv);
2265			if (err)
2266				return err;
2267		} else {
2268			err = pinctrl_pm_select_default_state(device);
2269			if (err)
2270				return err;
2271
2272			err = flexcan_chip_start(dev);
2273			if (err)
2274				return err;
2275
2276			flexcan_chip_interrupts_enable(dev);
2277		}
2278	}
2279
2280	return 0;
2281}
2282
2283static int __maybe_unused flexcan_runtime_suspend(struct device *device)
2284{
2285	struct net_device *dev = dev_get_drvdata(device);
2286	struct flexcan_priv *priv = netdev_priv(dev);
2287
2288	flexcan_clks_disable(priv);
2289
2290	return 0;
2291}
2292
2293static int __maybe_unused flexcan_runtime_resume(struct device *device)
2294{
2295	struct net_device *dev = dev_get_drvdata(device);
2296	struct flexcan_priv *priv = netdev_priv(dev);
2297
2298	return flexcan_clks_enable(priv);
2299}
2300
2301static int __maybe_unused flexcan_noirq_suspend(struct device *device)
2302{
2303	struct net_device *dev = dev_get_drvdata(device);
2304	struct flexcan_priv *priv = netdev_priv(dev);
2305
2306	if (netif_running(dev)) {
2307		int err;
2308
2309		if (device_may_wakeup(device))
2310			flexcan_enable_wakeup_irq(priv, true);
 
 
 
 
 
 
 
 
2311
2312		err = pm_runtime_force_suspend(device);
2313		if (err)
2314			return err;
2315	}
2316
2317	return 0;
2318}
2319
2320static int __maybe_unused flexcan_noirq_resume(struct device *device)
2321{
2322	struct net_device *dev = dev_get_drvdata(device);
2323	struct flexcan_priv *priv = netdev_priv(dev);
2324
2325	if (netif_running(dev)) {
2326		int err;
2327
2328		err = pm_runtime_force_resume(device);
2329		if (err)
2330			return err;
 
 
 
 
 
 
2331
2332		if (device_may_wakeup(device))
2333			flexcan_enable_wakeup_irq(priv, false);
2334	}
2335
2336	return 0;
2337}
2338
2339static const struct dev_pm_ops flexcan_pm_ops = {
2340	SET_SYSTEM_SLEEP_PM_OPS(flexcan_suspend, flexcan_resume)
2341	SET_RUNTIME_PM_OPS(flexcan_runtime_suspend, flexcan_runtime_resume, NULL)
2342	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(flexcan_noirq_suspend, flexcan_noirq_resume)
2343};
2344
2345static struct platform_driver flexcan_driver = {
2346	.driver = {
2347		.name = DRV_NAME,
2348		.pm = &flexcan_pm_ops,
2349		.of_match_table = flexcan_of_match,
2350	},
2351	.probe = flexcan_probe,
2352	.remove_new = flexcan_remove,
2353	.id_table = flexcan_id_table,
2354};
2355
2356module_platform_driver(flexcan_driver);
2357
2358MODULE_AUTHOR("Sascha Hauer <kernel@pengutronix.de>, "
2359	      "Marc Kleine-Budde <kernel@pengutronix.de>");
2360MODULE_LICENSE("GPL v2");
2361MODULE_DESCRIPTION("CAN port driver for flexcan based chip");