1// SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause
   2/* Copyright (C) 2018 KVASER AB, Sweden. All rights reserved.
   3 * Parts of this driver are based on the following:
   4 *  - Kvaser linux pciefd driver (version 5.42)
   5 *  - PEAK linux canfd driver
   6 */
   7
   8#include <linux/bitfield.h>
   9#include <linux/can/dev.h>
  10#include <linux/device.h>
  11#include <linux/ethtool.h>
  12#include <linux/iopoll.h>
  13#include <linux/kernel.h>
  14#include <linux/minmax.h>
  15#include <linux/module.h>
  16#include <linux/netdevice.h>
  17#include <linux/pci.h>
  18#include <linux/timer.h>
  19
  20MODULE_LICENSE("Dual BSD/GPL");
  21MODULE_AUTHOR("Kvaser AB <support@kvaser.com>");
  22MODULE_DESCRIPTION("CAN driver for Kvaser CAN/PCIe devices");
  23
  24#define KVASER_PCIEFD_DRV_NAME "kvaser_pciefd"
  25
  26#define KVASER_PCIEFD_WAIT_TIMEOUT msecs_to_jiffies(1000)
  27#define KVASER_PCIEFD_BEC_POLL_FREQ (jiffies + msecs_to_jiffies(200))
  28#define KVASER_PCIEFD_MAX_ERR_REP 256U
  29#define KVASER_PCIEFD_CAN_TX_MAX_COUNT 17U
  30#define KVASER_PCIEFD_MAX_CAN_CHANNELS 4UL
  31#define KVASER_PCIEFD_DMA_COUNT 2U
  32
  33#define KVASER_PCIEFD_DMA_SIZE (4U * 1024U)
  34
  35#define KVASER_PCIEFD_VENDOR 0x1a07
 
  36/* Altera based devices */
  37#define KVASER_PCIEFD_4HS_DEVICE_ID 0x000d
  38#define KVASER_PCIEFD_2HS_V2_DEVICE_ID 0x000e
  39#define KVASER_PCIEFD_HS_V2_DEVICE_ID 0x000f
  40#define KVASER_PCIEFD_MINIPCIE_HS_V2_DEVICE_ID 0x0010
  41#define KVASER_PCIEFD_MINIPCIE_2HS_V2_DEVICE_ID 0x0011
  42
  43/* SmartFusion2 based devices */
  44#define KVASER_PCIEFD_2CAN_V3_DEVICE_ID 0x0012
  45#define KVASER_PCIEFD_1CAN_V3_DEVICE_ID 0x0013
  46#define KVASER_PCIEFD_4CAN_V2_DEVICE_ID 0x0014
  47#define KVASER_PCIEFD_MINIPCIE_2CAN_V3_DEVICE_ID 0x0015
  48#define KVASER_PCIEFD_MINIPCIE_1CAN_V3_DEVICE_ID 0x0016
  49
 
 
 
 
  50/* Altera SerDes Enable 64-bit DMA address translation */
  51#define KVASER_PCIEFD_ALTERA_DMA_64BIT BIT(0)
  52
  53/* SmartFusion2 SerDes LSB address translation mask */
  54#define KVASER_PCIEFD_SF2_DMA_LSB_MASK GENMASK(31, 12)
  55
 
 
 
  56/* Kvaser KCAN CAN controller registers */
  57#define KVASER_PCIEFD_KCAN_FIFO_REG 0x100
  58#define KVASER_PCIEFD_KCAN_FIFO_LAST_REG 0x180
  59#define KVASER_PCIEFD_KCAN_CTRL_REG 0x2c0
  60#define KVASER_PCIEFD_KCAN_CMD_REG 0x400
  61#define KVASER_PCIEFD_KCAN_IEN_REG 0x408
  62#define KVASER_PCIEFD_KCAN_IRQ_REG 0x410
  63#define KVASER_PCIEFD_KCAN_TX_NR_PACKETS_REG 0x414
  64#define KVASER_PCIEFD_KCAN_STAT_REG 0x418
  65#define KVASER_PCIEFD_KCAN_MODE_REG 0x41c
  66#define KVASER_PCIEFD_KCAN_BTRN_REG 0x420
  67#define KVASER_PCIEFD_KCAN_BUS_LOAD_REG 0x424
  68#define KVASER_PCIEFD_KCAN_BTRD_REG 0x428
  69#define KVASER_PCIEFD_KCAN_PWM_REG 0x430
  70/* System identification and information registers */
  71#define KVASER_PCIEFD_SYSID_VERSION_REG 0x8
  72#define KVASER_PCIEFD_SYSID_CANFREQ_REG 0xc
  73#define KVASER_PCIEFD_SYSID_BUSFREQ_REG 0x10
  74#define KVASER_PCIEFD_SYSID_BUILD_REG 0x14
  75/* Shared receive buffer FIFO registers */
  76#define KVASER_PCIEFD_SRB_FIFO_LAST_REG 0x1f4
  77/* Shared receive buffer registers */
  78#define KVASER_PCIEFD_SRB_CMD_REG 0x0
  79#define KVASER_PCIEFD_SRB_IEN_REG 0x04
  80#define KVASER_PCIEFD_SRB_IRQ_REG 0x0c
  81#define KVASER_PCIEFD_SRB_STAT_REG 0x10
  82#define KVASER_PCIEFD_SRB_RX_NR_PACKETS_REG 0x14
  83#define KVASER_PCIEFD_SRB_CTRL_REG 0x18
  84
  85/* System build information fields */
  86#define KVASER_PCIEFD_SYSID_VERSION_NR_CHAN_MASK GENMASK(31, 24)
  87#define KVASER_PCIEFD_SYSID_VERSION_MAJOR_MASK GENMASK(23, 16)
  88#define KVASER_PCIEFD_SYSID_VERSION_MINOR_MASK GENMASK(7, 0)
  89#define KVASER_PCIEFD_SYSID_BUILD_SEQ_MASK GENMASK(15, 1)
  90
  91/* Reset DMA buffer 0, 1 and FIFO offset */
  92#define KVASER_PCIEFD_SRB_CMD_RDB1 BIT(5)
  93#define KVASER_PCIEFD_SRB_CMD_RDB0 BIT(4)
  94#define KVASER_PCIEFD_SRB_CMD_FOR BIT(0)
  95
  96/* DMA underflow, buffer 0 and 1 */
  97#define KVASER_PCIEFD_SRB_IRQ_DUF1 BIT(13)
  98#define KVASER_PCIEFD_SRB_IRQ_DUF0 BIT(12)
  99/* DMA overflow, buffer 0 and 1 */
 100#define KVASER_PCIEFD_SRB_IRQ_DOF1 BIT(11)
 101#define KVASER_PCIEFD_SRB_IRQ_DOF0 BIT(10)
 102/* DMA packet done, buffer 0 and 1 */
 103#define KVASER_PCIEFD_SRB_IRQ_DPD1 BIT(9)
 104#define KVASER_PCIEFD_SRB_IRQ_DPD0 BIT(8)
 105
 106/* Got DMA support */
 107#define KVASER_PCIEFD_SRB_STAT_DMA BIT(24)
 108/* DMA idle */
 109#define KVASER_PCIEFD_SRB_STAT_DI BIT(15)
 110
 111/* SRB current packet level */
 112#define KVASER_PCIEFD_SRB_RX_NR_PACKETS_MASK GENMASK(7, 0)
 113
 114/* DMA Enable */
 115#define KVASER_PCIEFD_SRB_CTRL_DMA_ENABLE BIT(0)
 116
 117/* KCAN CTRL packet types */
 118#define KVASER_PCIEFD_KCAN_CTRL_TYPE_MASK GENMASK(31, 29)
 119#define KVASER_PCIEFD_KCAN_CTRL_TYPE_EFLUSH 0x4
 120#define KVASER_PCIEFD_KCAN_CTRL_TYPE_EFRAME 0x5
 121
 122/* Command sequence number */
 123#define KVASER_PCIEFD_KCAN_CMD_SEQ_MASK GENMASK(23, 16)
 124/* Command bits */
 125#define KVASER_PCIEFD_KCAN_CMD_MASK GENMASK(5, 0)
 126/* Abort, flush and reset */
 127#define KVASER_PCIEFD_KCAN_CMD_AT BIT(1)
 128/* Request status packet */
 129#define KVASER_PCIEFD_KCAN_CMD_SRQ BIT(0)
 130
 131/* Transmitter unaligned */
 132#define KVASER_PCIEFD_KCAN_IRQ_TAL BIT(17)
 133/* Tx FIFO empty */
 134#define KVASER_PCIEFD_KCAN_IRQ_TE BIT(16)
 135/* Tx FIFO overflow */
 136#define KVASER_PCIEFD_KCAN_IRQ_TOF BIT(15)
 137/* Tx buffer flush done */
 138#define KVASER_PCIEFD_KCAN_IRQ_TFD BIT(14)
 139/* Abort done */
 140#define KVASER_PCIEFD_KCAN_IRQ_ABD BIT(13)
 141/* Rx FIFO overflow */
 142#define KVASER_PCIEFD_KCAN_IRQ_ROF BIT(5)
 143/* FDF bit when controller is in classic CAN mode */
 144#define KVASER_PCIEFD_KCAN_IRQ_FDIC BIT(3)
 145/* Bus parameter protection error */
 146#define KVASER_PCIEFD_KCAN_IRQ_BPP BIT(2)
 147/* Tx FIFO unaligned end */
 148#define KVASER_PCIEFD_KCAN_IRQ_TAE BIT(1)
 149/* Tx FIFO unaligned read */
 150#define KVASER_PCIEFD_KCAN_IRQ_TAR BIT(0)
 151
 152/* Tx FIFO size */
 153#define KVASER_PCIEFD_KCAN_TX_NR_PACKETS_MAX_MASK GENMASK(23, 16)
 154/* Tx FIFO current packet level */
 155#define KVASER_PCIEFD_KCAN_TX_NR_PACKETS_CURRENT_MASK GENMASK(7, 0)
 156
 157/* Current status packet sequence number */
 158#define KVASER_PCIEFD_KCAN_STAT_SEQNO_MASK GENMASK(31, 24)
 159/* Controller got CAN FD capability */
 160#define KVASER_PCIEFD_KCAN_STAT_FD BIT(19)
 161/* Controller got one-shot capability */
 162#define KVASER_PCIEFD_KCAN_STAT_CAP BIT(16)
 163/* Controller in reset mode */
 164#define KVASER_PCIEFD_KCAN_STAT_IRM BIT(15)
 165/* Reset mode request */
 166#define KVASER_PCIEFD_KCAN_STAT_RMR BIT(14)
 167/* Bus off */
 168#define KVASER_PCIEFD_KCAN_STAT_BOFF BIT(11)
 169/* Idle state. Controller in reset mode and no abort or flush pending */
 170#define KVASER_PCIEFD_KCAN_STAT_IDLE BIT(10)
 171/* Abort request */
 172#define KVASER_PCIEFD_KCAN_STAT_AR BIT(7)
 173/* Controller is bus off */
 174#define KVASER_PCIEFD_KCAN_STAT_BUS_OFF_MASK \
 175	(KVASER_PCIEFD_KCAN_STAT_AR | KVASER_PCIEFD_KCAN_STAT_BOFF | \
 176	 KVASER_PCIEFD_KCAN_STAT_RMR | KVASER_PCIEFD_KCAN_STAT_IRM)
 177
 178/* Classic CAN mode */
 179#define KVASER_PCIEFD_KCAN_MODE_CCM BIT(31)
 180/* Active error flag enable. Clear to force error passive */
 181#define KVASER_PCIEFD_KCAN_MODE_EEN BIT(23)
 182/* Acknowledgment packet type */
 183#define KVASER_PCIEFD_KCAN_MODE_APT BIT(20)
 184/* CAN FD non-ISO */
 185#define KVASER_PCIEFD_KCAN_MODE_NIFDEN BIT(15)
 186/* Error packet enable */
 187#define KVASER_PCIEFD_KCAN_MODE_EPEN BIT(12)
 188/* Listen only mode */
 189#define KVASER_PCIEFD_KCAN_MODE_LOM BIT(9)
 190/* Reset mode */
 191#define KVASER_PCIEFD_KCAN_MODE_RM BIT(8)
 192
 193/* BTRN and BTRD fields */
 194#define KVASER_PCIEFD_KCAN_BTRN_TSEG2_MASK GENMASK(30, 26)
 195#define KVASER_PCIEFD_KCAN_BTRN_TSEG1_MASK GENMASK(25, 17)
 196#define KVASER_PCIEFD_KCAN_BTRN_SJW_MASK GENMASK(16, 13)
 197#define KVASER_PCIEFD_KCAN_BTRN_BRP_MASK GENMASK(12, 0)
 198
 199/* PWM Control fields */
 200#define KVASER_PCIEFD_KCAN_PWM_TOP_MASK GENMASK(23, 16)
 201#define KVASER_PCIEFD_KCAN_PWM_TRIGGER_MASK GENMASK(7, 0)
 202
 203/* KCAN packet type IDs */
 204#define KVASER_PCIEFD_PACK_TYPE_DATA 0x0
 205#define KVASER_PCIEFD_PACK_TYPE_ACK 0x1
 206#define KVASER_PCIEFD_PACK_TYPE_TXRQ 0x2
 207#define KVASER_PCIEFD_PACK_TYPE_ERROR 0x3
 208#define KVASER_PCIEFD_PACK_TYPE_EFLUSH_ACK 0x4
 209#define KVASER_PCIEFD_PACK_TYPE_EFRAME_ACK 0x5
 210#define KVASER_PCIEFD_PACK_TYPE_ACK_DATA 0x6
 211#define KVASER_PCIEFD_PACK_TYPE_STATUS 0x8
 212#define KVASER_PCIEFD_PACK_TYPE_BUS_LOAD 0x9
 213
 214/* Common KCAN packet definitions, second word */
 215#define KVASER_PCIEFD_PACKET_TYPE_MASK GENMASK(31, 28)
 216#define KVASER_PCIEFD_PACKET_CHID_MASK GENMASK(27, 25)
 217#define KVASER_PCIEFD_PACKET_SEQ_MASK GENMASK(7, 0)
 218
 219/* KCAN Transmit/Receive data packet, first word */
 220#define KVASER_PCIEFD_RPACKET_IDE BIT(30)
 221#define KVASER_PCIEFD_RPACKET_RTR BIT(29)
 222#define KVASER_PCIEFD_RPACKET_ID_MASK GENMASK(28, 0)
 223/* KCAN Transmit data packet, second word */
 224#define KVASER_PCIEFD_TPACKET_AREQ BIT(31)
 225#define KVASER_PCIEFD_TPACKET_SMS BIT(16)
 226/* KCAN Transmit/Receive data packet, second word */
 227#define KVASER_PCIEFD_RPACKET_FDF BIT(15)
 228#define KVASER_PCIEFD_RPACKET_BRS BIT(14)
 229#define KVASER_PCIEFD_RPACKET_ESI BIT(13)
 230#define KVASER_PCIEFD_RPACKET_DLC_MASK GENMASK(11, 8)
 231
 232/* KCAN Transmit acknowledge packet, first word */
 233#define KVASER_PCIEFD_APACKET_NACK BIT(11)
 234#define KVASER_PCIEFD_APACKET_ABL BIT(10)
 235#define KVASER_PCIEFD_APACKET_CT BIT(9)
 236#define KVASER_PCIEFD_APACKET_FLU BIT(8)
 237
 238/* KCAN Status packet, first word */
 239#define KVASER_PCIEFD_SPACK_RMCD BIT(22)
 240#define KVASER_PCIEFD_SPACK_IRM BIT(21)
 241#define KVASER_PCIEFD_SPACK_IDET BIT(20)
 242#define KVASER_PCIEFD_SPACK_BOFF BIT(16)
 243#define KVASER_PCIEFD_SPACK_RXERR_MASK GENMASK(15, 8)
 244#define KVASER_PCIEFD_SPACK_TXERR_MASK GENMASK(7, 0)
 245/* KCAN Status packet, second word */
 246#define KVASER_PCIEFD_SPACK_EPLR BIT(24)
 247#define KVASER_PCIEFD_SPACK_EWLR BIT(23)
 248#define KVASER_PCIEFD_SPACK_AUTO BIT(21)
 249
 250/* KCAN Error detected packet, second word */
 251#define KVASER_PCIEFD_EPACK_DIR_TX BIT(0)
 252
 253/* Macros for calculating addresses of registers */
 254#define KVASER_PCIEFD_GET_BLOCK_ADDR(pcie, block) \
 255	((pcie)->reg_base + (pcie)->driver_data->address_offset->block)
 256#define KVASER_PCIEFD_PCI_IEN_ADDR(pcie) \
 257	(KVASER_PCIEFD_GET_BLOCK_ADDR((pcie), pci_ien))
 258#define KVASER_PCIEFD_PCI_IRQ_ADDR(pcie) \
 259	(KVASER_PCIEFD_GET_BLOCK_ADDR((pcie), pci_irq))
 260#define KVASER_PCIEFD_SERDES_ADDR(pcie) \
 261	(KVASER_PCIEFD_GET_BLOCK_ADDR((pcie), serdes))
 262#define KVASER_PCIEFD_SYSID_ADDR(pcie) \
 263	(KVASER_PCIEFD_GET_BLOCK_ADDR((pcie), sysid))
 264#define KVASER_PCIEFD_LOOPBACK_ADDR(pcie) \
 265	(KVASER_PCIEFD_GET_BLOCK_ADDR((pcie), loopback))
 266#define KVASER_PCIEFD_SRB_FIFO_ADDR(pcie) \
 267	(KVASER_PCIEFD_GET_BLOCK_ADDR((pcie), kcan_srb_fifo))
 268#define KVASER_PCIEFD_SRB_ADDR(pcie) \
 269	(KVASER_PCIEFD_GET_BLOCK_ADDR((pcie), kcan_srb))
 270#define KVASER_PCIEFD_KCAN_CH0_ADDR(pcie) \
 271	(KVASER_PCIEFD_GET_BLOCK_ADDR((pcie), kcan_ch0))
 272#define KVASER_PCIEFD_KCAN_CH1_ADDR(pcie) \
 273	(KVASER_PCIEFD_GET_BLOCK_ADDR((pcie), kcan_ch1))
 274#define KVASER_PCIEFD_KCAN_CHANNEL_SPAN(pcie) \
 275	(KVASER_PCIEFD_KCAN_CH1_ADDR((pcie)) - KVASER_PCIEFD_KCAN_CH0_ADDR((pcie)))
 276#define KVASER_PCIEFD_KCAN_CHX_ADDR(pcie, i) \
 277	(KVASER_PCIEFD_KCAN_CH0_ADDR((pcie)) + (i) * KVASER_PCIEFD_KCAN_CHANNEL_SPAN((pcie)))
 278
 279struct kvaser_pciefd;
 280static void kvaser_pciefd_write_dma_map_altera(struct kvaser_pciefd *pcie,
 281					       dma_addr_t addr, int index);
 282static void kvaser_pciefd_write_dma_map_sf2(struct kvaser_pciefd *pcie,
 283					    dma_addr_t addr, int index);
 
 
 284
 285struct kvaser_pciefd_address_offset {
 286	u32 serdes;
 287	u32 pci_ien;
 288	u32 pci_irq;
 289	u32 sysid;
 290	u32 loopback;
 291	u32 kcan_srb_fifo;
 292	u32 kcan_srb;
 293	u32 kcan_ch0;
 294	u32 kcan_ch1;
 295};
 296
 297struct kvaser_pciefd_dev_ops {
 298	void (*kvaser_pciefd_write_dma_map)(struct kvaser_pciefd *pcie,
 299					    dma_addr_t addr, int index);
 300};
 301
 302struct kvaser_pciefd_irq_mask {
 303	u32 kcan_rx0;
 304	u32 kcan_tx[KVASER_PCIEFD_MAX_CAN_CHANNELS];
 305	u32 all;
 306};
 307
 308struct kvaser_pciefd_driver_data {
 309	const struct kvaser_pciefd_address_offset *address_offset;
 310	const struct kvaser_pciefd_irq_mask *irq_mask;
 311	const struct kvaser_pciefd_dev_ops *ops;
 312};
 313
 314static const struct kvaser_pciefd_address_offset kvaser_pciefd_altera_address_offset = {
 315	.serdes = 0x1000,
 316	.pci_ien = 0x50,
 317	.pci_irq = 0x40,
 318	.sysid = 0x1f020,
 319	.loopback = 0x1f000,
 320	.kcan_srb_fifo = 0x1f200,
 321	.kcan_srb = 0x1f400,
 322	.kcan_ch0 = 0x10000,
 323	.kcan_ch1 = 0x11000,
 324};
 325
 326static const struct kvaser_pciefd_address_offset kvaser_pciefd_sf2_address_offset = {
 327	.serdes = 0x280c8,
 328	.pci_ien = 0x102004,
 329	.pci_irq = 0x102008,
 330	.sysid = 0x100000,
 331	.loopback = 0x103000,
 332	.kcan_srb_fifo = 0x120000,
 333	.kcan_srb = 0x121000,
 334	.kcan_ch0 = 0x140000,
 335	.kcan_ch1 = 0x142000,
 336};
 337
 
 
 
 
 
 
 
 
 
 
 
 
 338static const struct kvaser_pciefd_irq_mask kvaser_pciefd_altera_irq_mask = {
 339	.kcan_rx0 = BIT(4),
 340	.kcan_tx = { BIT(0), BIT(1), BIT(2), BIT(3) },
 341	.all = GENMASK(4, 0),
 342};
 343
 344static const struct kvaser_pciefd_irq_mask kvaser_pciefd_sf2_irq_mask = {
 345	.kcan_rx0 = BIT(4),
 346	.kcan_tx = { BIT(16), BIT(17), BIT(18), BIT(19) },
 347	.all = GENMASK(19, 16) | BIT(4),
 348};
 349
 
 
 
 
 
 
 350static const struct kvaser_pciefd_dev_ops kvaser_pciefd_altera_dev_ops = {
 351	.kvaser_pciefd_write_dma_map = kvaser_pciefd_write_dma_map_altera,
 352};
 353
 354static const struct kvaser_pciefd_dev_ops kvaser_pciefd_sf2_dev_ops = {
 355	.kvaser_pciefd_write_dma_map = kvaser_pciefd_write_dma_map_sf2,
 356};
 357
 
 
 
 
 358static const struct kvaser_pciefd_driver_data kvaser_pciefd_altera_driver_data = {
 359	.address_offset = &kvaser_pciefd_altera_address_offset,
 360	.irq_mask = &kvaser_pciefd_altera_irq_mask,
 361	.ops = &kvaser_pciefd_altera_dev_ops,
 362};
 363
 364static const struct kvaser_pciefd_driver_data kvaser_pciefd_sf2_driver_data = {
 365	.address_offset = &kvaser_pciefd_sf2_address_offset,
 366	.irq_mask = &kvaser_pciefd_sf2_irq_mask,
 367	.ops = &kvaser_pciefd_sf2_dev_ops,
 368};
 369
 
 
 
 
 
 
 370struct kvaser_pciefd_can {
 371	struct can_priv can;
 372	struct kvaser_pciefd *kv_pcie;
 373	void __iomem *reg_base;
 374	struct can_berr_counter bec;
 375	u8 cmd_seq;
 376	int err_rep_cnt;
 377	int echo_idx;
 378	spinlock_t lock; /* Locks sensitive registers (e.g. MODE) */
 379	spinlock_t echo_lock; /* Locks the message echo buffer */
 380	struct timer_list bec_poll_timer;
 381	struct completion start_comp, flush_comp;
 382};
 383
 384struct kvaser_pciefd {
 385	struct pci_dev *pci;
 386	void __iomem *reg_base;
 387	struct kvaser_pciefd_can *can[KVASER_PCIEFD_MAX_CAN_CHANNELS];
 388	const struct kvaser_pciefd_driver_data *driver_data;
 389	void *dma_data[KVASER_PCIEFD_DMA_COUNT];
 390	u8 nr_channels;
 391	u32 bus_freq;
 392	u32 freq;
 393	u32 freq_to_ticks_div;
 394};
 395
 396struct kvaser_pciefd_rx_packet {
 397	u32 header[2];
 398	u64 timestamp;
 399};
 400
 401struct kvaser_pciefd_tx_packet {
 402	u32 header[2];
 403	u8 data[64];
 404};
 405
 406static const struct can_bittiming_const kvaser_pciefd_bittiming_const = {
 407	.name = KVASER_PCIEFD_DRV_NAME,
 408	.tseg1_min = 1,
 409	.tseg1_max = 512,
 410	.tseg2_min = 1,
 411	.tseg2_max = 32,
 412	.sjw_max = 16,
 413	.brp_min = 1,
 414	.brp_max = 8192,
 415	.brp_inc = 1,
 416};
 417
 418static struct pci_device_id kvaser_pciefd_id_table[] = {
 419	{
 420		PCI_DEVICE(KVASER_PCIEFD_VENDOR, KVASER_PCIEFD_4HS_DEVICE_ID),
 421		.driver_data = (kernel_ulong_t)&kvaser_pciefd_altera_driver_data,
 422	},
 423	{
 424		PCI_DEVICE(KVASER_PCIEFD_VENDOR, KVASER_PCIEFD_2HS_V2_DEVICE_ID),
 425		.driver_data = (kernel_ulong_t)&kvaser_pciefd_altera_driver_data,
 426	},
 427	{
 428		PCI_DEVICE(KVASER_PCIEFD_VENDOR, KVASER_PCIEFD_HS_V2_DEVICE_ID),
 429		.driver_data = (kernel_ulong_t)&kvaser_pciefd_altera_driver_data,
 430	},
 431	{
 432		PCI_DEVICE(KVASER_PCIEFD_VENDOR, KVASER_PCIEFD_MINIPCIE_HS_V2_DEVICE_ID),
 433		.driver_data = (kernel_ulong_t)&kvaser_pciefd_altera_driver_data,
 434	},
 435	{
 436		PCI_DEVICE(KVASER_PCIEFD_VENDOR, KVASER_PCIEFD_MINIPCIE_2HS_V2_DEVICE_ID),
 437		.driver_data = (kernel_ulong_t)&kvaser_pciefd_altera_driver_data,
 438	},
 439	{
 440		PCI_DEVICE(KVASER_PCIEFD_VENDOR, KVASER_PCIEFD_2CAN_V3_DEVICE_ID),
 441		.driver_data = (kernel_ulong_t)&kvaser_pciefd_sf2_driver_data,
 442	},
 443	{
 444		PCI_DEVICE(KVASER_PCIEFD_VENDOR, KVASER_PCIEFD_1CAN_V3_DEVICE_ID),
 445		.driver_data = (kernel_ulong_t)&kvaser_pciefd_sf2_driver_data,
 446	},
 447	{
 448		PCI_DEVICE(KVASER_PCIEFD_VENDOR, KVASER_PCIEFD_4CAN_V2_DEVICE_ID),
 449		.driver_data = (kernel_ulong_t)&kvaser_pciefd_sf2_driver_data,
 450	},
 451	{
 452		PCI_DEVICE(KVASER_PCIEFD_VENDOR, KVASER_PCIEFD_MINIPCIE_2CAN_V3_DEVICE_ID),
 453		.driver_data = (kernel_ulong_t)&kvaser_pciefd_sf2_driver_data,
 454	},
 455	{
 456		PCI_DEVICE(KVASER_PCIEFD_VENDOR, KVASER_PCIEFD_MINIPCIE_1CAN_V3_DEVICE_ID),
 457		.driver_data = (kernel_ulong_t)&kvaser_pciefd_sf2_driver_data,
 458	},
 459	{
 
 
 
 
 
 
 
 
 460		0,
 461	},
 462};
 463MODULE_DEVICE_TABLE(pci, kvaser_pciefd_id_table);
 464
 465static inline void kvaser_pciefd_send_kcan_cmd(struct kvaser_pciefd_can *can, u32 cmd)
 466{
 467	iowrite32(FIELD_PREP(KVASER_PCIEFD_KCAN_CMD_MASK, cmd) |
 468		  FIELD_PREP(KVASER_PCIEFD_KCAN_CMD_SEQ_MASK, ++can->cmd_seq),
 469		  can->reg_base + KVASER_PCIEFD_KCAN_CMD_REG);
 470}
 471
 472static inline void kvaser_pciefd_request_status(struct kvaser_pciefd_can *can)
 473{
 474	kvaser_pciefd_send_kcan_cmd(can, KVASER_PCIEFD_KCAN_CMD_SRQ);
 475}
 476
 477static inline void kvaser_pciefd_abort_flush_reset(struct kvaser_pciefd_can *can)
 478{
 479	kvaser_pciefd_send_kcan_cmd(can, KVASER_PCIEFD_KCAN_CMD_AT);
 480}
 481
 482static void kvaser_pciefd_enable_err_gen(struct kvaser_pciefd_can *can)
 483{
 484	u32 mode;
 485	unsigned long irq;
 486
 487	spin_lock_irqsave(&can->lock, irq);
 488	mode = ioread32(can->reg_base + KVASER_PCIEFD_KCAN_MODE_REG);
 489	if (!(mode & KVASER_PCIEFD_KCAN_MODE_EPEN)) {
 490		mode |= KVASER_PCIEFD_KCAN_MODE_EPEN;
 491		iowrite32(mode, can->reg_base + KVASER_PCIEFD_KCAN_MODE_REG);
 492	}
 493	spin_unlock_irqrestore(&can->lock, irq);
 494}
 495
 496static void kvaser_pciefd_disable_err_gen(struct kvaser_pciefd_can *can)
 497{
 498	u32 mode;
 499	unsigned long irq;
 500
 501	spin_lock_irqsave(&can->lock, irq);
 502	mode = ioread32(can->reg_base + KVASER_PCIEFD_KCAN_MODE_REG);
 503	mode &= ~KVASER_PCIEFD_KCAN_MODE_EPEN;
 504	iowrite32(mode, can->reg_base + KVASER_PCIEFD_KCAN_MODE_REG);
 505	spin_unlock_irqrestore(&can->lock, irq);
 506}
 507
 508static void kvaser_pciefd_set_tx_irq(struct kvaser_pciefd_can *can)
 509{
 510	u32 msk;
 511
 512	msk = KVASER_PCIEFD_KCAN_IRQ_TE | KVASER_PCIEFD_KCAN_IRQ_ROF |
 513	      KVASER_PCIEFD_KCAN_IRQ_TOF | KVASER_PCIEFD_KCAN_IRQ_ABD |
 514	      KVASER_PCIEFD_KCAN_IRQ_TAE | KVASER_PCIEFD_KCAN_IRQ_TAL |
 515	      KVASER_PCIEFD_KCAN_IRQ_FDIC | KVASER_PCIEFD_KCAN_IRQ_BPP |
 516	      KVASER_PCIEFD_KCAN_IRQ_TAR;
 517
 518	iowrite32(msk, can->reg_base + KVASER_PCIEFD_KCAN_IEN_REG);
 519}
 520
 521static inline void kvaser_pciefd_set_skb_timestamp(const struct kvaser_pciefd *pcie,
 522						   struct sk_buff *skb, u64 timestamp)
 523{
 524	skb_hwtstamps(skb)->hwtstamp =
 525		ns_to_ktime(div_u64(timestamp * 1000, pcie->freq_to_ticks_div));
 526}
 527
 528static void kvaser_pciefd_setup_controller(struct kvaser_pciefd_can *can)
 529{
 530	u32 mode;
 531	unsigned long irq;
 532
 533	spin_lock_irqsave(&can->lock, irq);
 534	mode = ioread32(can->reg_base + KVASER_PCIEFD_KCAN_MODE_REG);
 535	if (can->can.ctrlmode & CAN_CTRLMODE_FD) {
 536		mode &= ~KVASER_PCIEFD_KCAN_MODE_CCM;
 537		if (can->can.ctrlmode & CAN_CTRLMODE_FD_NON_ISO)
 538			mode |= KVASER_PCIEFD_KCAN_MODE_NIFDEN;
 539		else
 540			mode &= ~KVASER_PCIEFD_KCAN_MODE_NIFDEN;
 541	} else {
 542		mode |= KVASER_PCIEFD_KCAN_MODE_CCM;
 543		mode &= ~KVASER_PCIEFD_KCAN_MODE_NIFDEN;
 544	}
 545
 546	if (can->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
 547		mode |= KVASER_PCIEFD_KCAN_MODE_LOM;
 548	else
 549		mode &= ~KVASER_PCIEFD_KCAN_MODE_LOM;
 550	mode |= KVASER_PCIEFD_KCAN_MODE_EEN;
 551	mode |= KVASER_PCIEFD_KCAN_MODE_EPEN;
 552	/* Use ACK packet type */
 553	mode &= ~KVASER_PCIEFD_KCAN_MODE_APT;
 554	mode &= ~KVASER_PCIEFD_KCAN_MODE_RM;
 555	iowrite32(mode, can->reg_base + KVASER_PCIEFD_KCAN_MODE_REG);
 556
 557	spin_unlock_irqrestore(&can->lock, irq);
 558}
 559
 560static void kvaser_pciefd_start_controller_flush(struct kvaser_pciefd_can *can)
 561{
 562	u32 status;
 563	unsigned long irq;
 564
 565	spin_lock_irqsave(&can->lock, irq);
 566	iowrite32(GENMASK(31, 0), can->reg_base + KVASER_PCIEFD_KCAN_IRQ_REG);
 567	iowrite32(KVASER_PCIEFD_KCAN_IRQ_ABD,
 568		  can->reg_base + KVASER_PCIEFD_KCAN_IEN_REG);
 569	status = ioread32(can->reg_base + KVASER_PCIEFD_KCAN_STAT_REG);
 570	if (status & KVASER_PCIEFD_KCAN_STAT_IDLE) {
 571		/* If controller is already idle, run abort, flush and reset */
 572		kvaser_pciefd_abort_flush_reset(can);
 573	} else if (!(status & KVASER_PCIEFD_KCAN_STAT_RMR)) {
 574		u32 mode;
 575
 576		/* Put controller in reset mode */
 577		mode = ioread32(can->reg_base + KVASER_PCIEFD_KCAN_MODE_REG);
 578		mode |= KVASER_PCIEFD_KCAN_MODE_RM;
 579		iowrite32(mode, can->reg_base + KVASER_PCIEFD_KCAN_MODE_REG);
 580	}
 581	spin_unlock_irqrestore(&can->lock, irq);
 582}
 583
 584static int kvaser_pciefd_bus_on(struct kvaser_pciefd_can *can)
 585{
 586	u32 mode;
 587	unsigned long irq;
 588
 589	del_timer(&can->bec_poll_timer);
 590	if (!completion_done(&can->flush_comp))
 591		kvaser_pciefd_start_controller_flush(can);
 592
 593	if (!wait_for_completion_timeout(&can->flush_comp,
 594					 KVASER_PCIEFD_WAIT_TIMEOUT)) {
 595		netdev_err(can->can.dev, "Timeout during bus on flush\n");
 596		return -ETIMEDOUT;
 597	}
 598
 599	spin_lock_irqsave(&can->lock, irq);
 600	iowrite32(0, can->reg_base + KVASER_PCIEFD_KCAN_IEN_REG);
 601	iowrite32(GENMASK(31, 0), can->reg_base + KVASER_PCIEFD_KCAN_IRQ_REG);
 602	iowrite32(KVASER_PCIEFD_KCAN_IRQ_ABD,
 603		  can->reg_base + KVASER_PCIEFD_KCAN_IEN_REG);
 604	mode = ioread32(can->reg_base + KVASER_PCIEFD_KCAN_MODE_REG);
 605	mode &= ~KVASER_PCIEFD_KCAN_MODE_RM;
 606	iowrite32(mode, can->reg_base + KVASER_PCIEFD_KCAN_MODE_REG);
 607	spin_unlock_irqrestore(&can->lock, irq);
 608
 609	if (!wait_for_completion_timeout(&can->start_comp,
 610					 KVASER_PCIEFD_WAIT_TIMEOUT)) {
 611		netdev_err(can->can.dev, "Timeout during bus on reset\n");
 612		return -ETIMEDOUT;
 613	}
 614	/* Reset interrupt handling */
 615	iowrite32(0, can->reg_base + KVASER_PCIEFD_KCAN_IEN_REG);
 616	iowrite32(GENMASK(31, 0), can->reg_base + KVASER_PCIEFD_KCAN_IRQ_REG);
 617
 618	kvaser_pciefd_set_tx_irq(can);
 619	kvaser_pciefd_setup_controller(can);
 620	can->can.state = CAN_STATE_ERROR_ACTIVE;
 621	netif_wake_queue(can->can.dev);
 622	can->bec.txerr = 0;
 623	can->bec.rxerr = 0;
 624	can->err_rep_cnt = 0;
 625
 626	return 0;
 627}
 628
 629static void kvaser_pciefd_pwm_stop(struct kvaser_pciefd_can *can)
 630{
 631	u8 top;
 632	u32 pwm_ctrl;
 633	unsigned long irq;
 634
 635	spin_lock_irqsave(&can->lock, irq);
 636	pwm_ctrl = ioread32(can->reg_base + KVASER_PCIEFD_KCAN_PWM_REG);
 637	top = FIELD_GET(KVASER_PCIEFD_KCAN_PWM_TOP_MASK, pwm_ctrl);
 638	/* Set duty cycle to zero */
 639	pwm_ctrl |= FIELD_PREP(KVASER_PCIEFD_KCAN_PWM_TRIGGER_MASK, top);
 640	iowrite32(pwm_ctrl, can->reg_base + KVASER_PCIEFD_KCAN_PWM_REG);
 641	spin_unlock_irqrestore(&can->lock, irq);
 642}
 643
 644static void kvaser_pciefd_pwm_start(struct kvaser_pciefd_can *can)
 645{
 646	int top, trigger;
 647	u32 pwm_ctrl;
 648	unsigned long irq;
 649
 650	kvaser_pciefd_pwm_stop(can);
 651	spin_lock_irqsave(&can->lock, irq);
 652	/* Set frequency to 500 KHz */
 653	top = can->kv_pcie->bus_freq / (2 * 500000) - 1;
 654
 655	pwm_ctrl = FIELD_PREP(KVASER_PCIEFD_KCAN_PWM_TRIGGER_MASK, top);
 656	pwm_ctrl |= FIELD_PREP(KVASER_PCIEFD_KCAN_PWM_TOP_MASK, top);
 657	iowrite32(pwm_ctrl, can->reg_base + KVASER_PCIEFD_KCAN_PWM_REG);
 658
 659	/* Set duty cycle to 95 */
 660	trigger = (100 * top - 95 * (top + 1) + 50) / 100;
 661	pwm_ctrl = FIELD_PREP(KVASER_PCIEFD_KCAN_PWM_TRIGGER_MASK, trigger);
 662	pwm_ctrl |= FIELD_PREP(KVASER_PCIEFD_KCAN_PWM_TOP_MASK, top);
 663	iowrite32(pwm_ctrl, can->reg_base + KVASER_PCIEFD_KCAN_PWM_REG);
 664	spin_unlock_irqrestore(&can->lock, irq);
 665}
 666
 667static int kvaser_pciefd_open(struct net_device *netdev)
 668{
 669	int err;
 670	struct kvaser_pciefd_can *can = netdev_priv(netdev);
 671
 672	err = open_candev(netdev);
 673	if (err)
 674		return err;
 675
 676	err = kvaser_pciefd_bus_on(can);
 677	if (err) {
 678		close_candev(netdev);
 679		return err;
 680	}
 681
 682	return 0;
 683}
 684
 685static int kvaser_pciefd_stop(struct net_device *netdev)
 686{
 687	struct kvaser_pciefd_can *can = netdev_priv(netdev);
 688	int ret = 0;
 689
 690	/* Don't interrupt ongoing flush */
 691	if (!completion_done(&can->flush_comp))
 692		kvaser_pciefd_start_controller_flush(can);
 693
 694	if (!wait_for_completion_timeout(&can->flush_comp,
 695					 KVASER_PCIEFD_WAIT_TIMEOUT)) {
 696		netdev_err(can->can.dev, "Timeout during stop\n");
 697		ret = -ETIMEDOUT;
 698	} else {
 699		iowrite32(0, can->reg_base + KVASER_PCIEFD_KCAN_IEN_REG);
 700		del_timer(&can->bec_poll_timer);
 701	}
 702	can->can.state = CAN_STATE_STOPPED;
 703	close_candev(netdev);
 704
 705	return ret;
 706}
 707
 708static int kvaser_pciefd_prepare_tx_packet(struct kvaser_pciefd_tx_packet *p,
 709					   struct kvaser_pciefd_can *can,
 710					   struct sk_buff *skb)
 711{
 712	struct canfd_frame *cf = (struct canfd_frame *)skb->data;
 713	int packet_size;
 714	int seq = can->echo_idx;
 715
 716	memset(p, 0, sizeof(*p));
 717	if (can->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT)
 718		p->header[1] |= KVASER_PCIEFD_TPACKET_SMS;
 719
 720	if (cf->can_id & CAN_RTR_FLAG)
 721		p->header[0] |= KVASER_PCIEFD_RPACKET_RTR;
 722
 723	if (cf->can_id & CAN_EFF_FLAG)
 724		p->header[0] |= KVASER_PCIEFD_RPACKET_IDE;
 725
 726	p->header[0] |= FIELD_PREP(KVASER_PCIEFD_RPACKET_ID_MASK, cf->can_id);
 727	p->header[1] |= KVASER_PCIEFD_TPACKET_AREQ;
 728
 729	if (can_is_canfd_skb(skb)) {
 730		p->header[1] |= FIELD_PREP(KVASER_PCIEFD_RPACKET_DLC_MASK,
 731					   can_fd_len2dlc(cf->len));
 732		p->header[1] |= KVASER_PCIEFD_RPACKET_FDF;
 733		if (cf->flags & CANFD_BRS)
 734			p->header[1] |= KVASER_PCIEFD_RPACKET_BRS;
 735		if (cf->flags & CANFD_ESI)
 736			p->header[1] |= KVASER_PCIEFD_RPACKET_ESI;
 737	} else {
 738		p->header[1] |=
 739			FIELD_PREP(KVASER_PCIEFD_RPACKET_DLC_MASK,
 740				   can_get_cc_dlc((struct can_frame *)cf, can->can.ctrlmode));
 741	}
 742
 743	p->header[1] |= FIELD_PREP(KVASER_PCIEFD_PACKET_SEQ_MASK, seq);
 744
 745	packet_size = cf->len;
 746	memcpy(p->data, cf->data, packet_size);
 747
 748	return DIV_ROUND_UP(packet_size, 4);
 749}
 750
 751static netdev_tx_t kvaser_pciefd_start_xmit(struct sk_buff *skb,
 752					    struct net_device *netdev)
 753{
 754	struct kvaser_pciefd_can *can = netdev_priv(netdev);
 755	unsigned long irq_flags;
 756	struct kvaser_pciefd_tx_packet packet;
 757	int nr_words;
 758	u8 count;
 759
 760	if (can_dev_dropped_skb(netdev, skb))
 761		return NETDEV_TX_OK;
 762
 763	nr_words = kvaser_pciefd_prepare_tx_packet(&packet, can, skb);
 764
 765	spin_lock_irqsave(&can->echo_lock, irq_flags);
 766	/* Prepare and save echo skb in internal slot */
 767	can_put_echo_skb(skb, netdev, can->echo_idx, 0);
 768
 769	/* Move echo index to the next slot */
 770	can->echo_idx = (can->echo_idx + 1) % can->can.echo_skb_max;
 771
 772	/* Write header to fifo */
 773	iowrite32(packet.header[0],
 774		  can->reg_base + KVASER_PCIEFD_KCAN_FIFO_REG);
 775	iowrite32(packet.header[1],
 776		  can->reg_base + KVASER_PCIEFD_KCAN_FIFO_REG);
 777
 778	if (nr_words) {
 779		u32 data_last = ((u32 *)packet.data)[nr_words - 1];
 780
 781		/* Write data to fifo, except last word */
 782		iowrite32_rep(can->reg_base +
 783			      KVASER_PCIEFD_KCAN_FIFO_REG, packet.data,
 784			      nr_words - 1);
 785		/* Write last word to end of fifo */
 786		__raw_writel(data_last, can->reg_base +
 787			     KVASER_PCIEFD_KCAN_FIFO_LAST_REG);
 788	} else {
 789		/* Complete write to fifo */
 790		__raw_writel(0, can->reg_base +
 791			     KVASER_PCIEFD_KCAN_FIFO_LAST_REG);
 792	}
 793
 794	count = FIELD_GET(KVASER_PCIEFD_KCAN_TX_NR_PACKETS_CURRENT_MASK,
 795			  ioread32(can->reg_base + KVASER_PCIEFD_KCAN_TX_NR_PACKETS_REG));
 796	/* No room for a new message, stop the queue until at least one
 797	 * successful transmit
 798	 */
 799	if (count >= can->can.echo_skb_max || can->can.echo_skb[can->echo_idx])
 800		netif_stop_queue(netdev);
 801	spin_unlock_irqrestore(&can->echo_lock, irq_flags);
 802
 803	return NETDEV_TX_OK;
 804}
 805
 806static int kvaser_pciefd_set_bittiming(struct kvaser_pciefd_can *can, bool data)
 807{
 808	u32 mode, test, btrn;
 809	unsigned long irq_flags;
 810	int ret;
 811	struct can_bittiming *bt;
 812
 813	if (data)
 814		bt = &can->can.data_bittiming;
 815	else
 816		bt = &can->can.bittiming;
 817
 818	btrn = FIELD_PREP(KVASER_PCIEFD_KCAN_BTRN_TSEG2_MASK, bt->phase_seg2 - 1) |
 819	       FIELD_PREP(KVASER_PCIEFD_KCAN_BTRN_TSEG1_MASK, bt->prop_seg + bt->phase_seg1 - 1) |
 820	       FIELD_PREP(KVASER_PCIEFD_KCAN_BTRN_SJW_MASK, bt->sjw - 1) |
 821	       FIELD_PREP(KVASER_PCIEFD_KCAN_BTRN_BRP_MASK, bt->brp - 1);
 822
 823	spin_lock_irqsave(&can->lock, irq_flags);
 824	mode = ioread32(can->reg_base + KVASER_PCIEFD_KCAN_MODE_REG);
 825	/* Put the circuit in reset mode */
 826	iowrite32(mode | KVASER_PCIEFD_KCAN_MODE_RM,
 827		  can->reg_base + KVASER_PCIEFD_KCAN_MODE_REG);
 828
 829	/* Can only set bittiming if in reset mode */
 830	ret = readl_poll_timeout(can->reg_base + KVASER_PCIEFD_KCAN_MODE_REG,
 831				 test, test & KVASER_PCIEFD_KCAN_MODE_RM, 0, 10);
 832	if (ret) {
 833		spin_unlock_irqrestore(&can->lock, irq_flags);
 834		return -EBUSY;
 835	}
 836
 837	if (data)
 838		iowrite32(btrn, can->reg_base + KVASER_PCIEFD_KCAN_BTRD_REG);
 839	else
 840		iowrite32(btrn, can->reg_base + KVASER_PCIEFD_KCAN_BTRN_REG);
 841	/* Restore previous reset mode status */
 842	iowrite32(mode, can->reg_base + KVASER_PCIEFD_KCAN_MODE_REG);
 843	spin_unlock_irqrestore(&can->lock, irq_flags);
 844
 845	return 0;
 846}
 847
 848static int kvaser_pciefd_set_nominal_bittiming(struct net_device *ndev)
 849{
 850	return kvaser_pciefd_set_bittiming(netdev_priv(ndev), false);
 851}
 852
 853static int kvaser_pciefd_set_data_bittiming(struct net_device *ndev)
 854{
 855	return kvaser_pciefd_set_bittiming(netdev_priv(ndev), true);
 856}
 857
 858static int kvaser_pciefd_set_mode(struct net_device *ndev, enum can_mode mode)
 859{
 860	struct kvaser_pciefd_can *can = netdev_priv(ndev);
 861	int ret = 0;
 862
 863	switch (mode) {
 864	case CAN_MODE_START:
 865		if (!can->can.restart_ms)
 866			ret = kvaser_pciefd_bus_on(can);
 867		break;
 868	default:
 869		return -EOPNOTSUPP;
 870	}
 871
 872	return ret;
 873}
 874
 875static int kvaser_pciefd_get_berr_counter(const struct net_device *ndev,
 876					  struct can_berr_counter *bec)
 877{
 878	struct kvaser_pciefd_can *can = netdev_priv(ndev);
 879
 880	bec->rxerr = can->bec.rxerr;
 881	bec->txerr = can->bec.txerr;
 882
 883	return 0;
 884}
 885
 886static void kvaser_pciefd_bec_poll_timer(struct timer_list *data)
 887{
 888	struct kvaser_pciefd_can *can = from_timer(can, data, bec_poll_timer);
 889
 890	kvaser_pciefd_enable_err_gen(can);
 891	kvaser_pciefd_request_status(can);
 892	can->err_rep_cnt = 0;
 893}
 894
 895static const struct net_device_ops kvaser_pciefd_netdev_ops = {
 896	.ndo_open = kvaser_pciefd_open,
 897	.ndo_stop = kvaser_pciefd_stop,
 898	.ndo_eth_ioctl = can_eth_ioctl_hwts,
 899	.ndo_start_xmit = kvaser_pciefd_start_xmit,
 900	.ndo_change_mtu = can_change_mtu,
 901};
 902
 903static const struct ethtool_ops kvaser_pciefd_ethtool_ops = {
 904	.get_ts_info = can_ethtool_op_get_ts_info_hwts,
 905};
 906
 907static int kvaser_pciefd_setup_can_ctrls(struct kvaser_pciefd *pcie)
 908{
 909	int i;
 910
 911	for (i = 0; i < pcie->nr_channels; i++) {
 912		struct net_device *netdev;
 913		struct kvaser_pciefd_can *can;
 914		u32 status, tx_nr_packets_max;
 915
 916		netdev = alloc_candev(sizeof(struct kvaser_pciefd_can),
 917				      KVASER_PCIEFD_CAN_TX_MAX_COUNT);
 918		if (!netdev)
 919			return -ENOMEM;
 920
 921		can = netdev_priv(netdev);
 922		netdev->netdev_ops = &kvaser_pciefd_netdev_ops;
 923		netdev->ethtool_ops = &kvaser_pciefd_ethtool_ops;
 924		can->reg_base = KVASER_PCIEFD_KCAN_CHX_ADDR(pcie, i);
 925		can->kv_pcie = pcie;
 926		can->cmd_seq = 0;
 927		can->err_rep_cnt = 0;
 928		can->bec.txerr = 0;
 929		can->bec.rxerr = 0;
 930
 931		init_completion(&can->start_comp);
 932		init_completion(&can->flush_comp);
 933		timer_setup(&can->bec_poll_timer, kvaser_pciefd_bec_poll_timer, 0);
 934
 935		/* Disable Bus load reporting */
 936		iowrite32(0, can->reg_base + KVASER_PCIEFD_KCAN_BUS_LOAD_REG);
 937
 938		tx_nr_packets_max =
 939			FIELD_GET(KVASER_PCIEFD_KCAN_TX_NR_PACKETS_MAX_MASK,
 940				  ioread32(can->reg_base + KVASER_PCIEFD_KCAN_TX_NR_PACKETS_REG));
 941
 942		can->can.clock.freq = pcie->freq;
 943		can->can.echo_skb_max = min(KVASER_PCIEFD_CAN_TX_MAX_COUNT, tx_nr_packets_max - 1);
 944		can->echo_idx = 0;
 945		spin_lock_init(&can->echo_lock);
 946		spin_lock_init(&can->lock);
 947
 948		can->can.bittiming_const = &kvaser_pciefd_bittiming_const;
 949		can->can.data_bittiming_const = &kvaser_pciefd_bittiming_const;
 950		can->can.do_set_bittiming = kvaser_pciefd_set_nominal_bittiming;
 951		can->can.do_set_data_bittiming = kvaser_pciefd_set_data_bittiming;
 952		can->can.do_set_mode = kvaser_pciefd_set_mode;
 953		can->can.do_get_berr_counter = kvaser_pciefd_get_berr_counter;
 954		can->can.ctrlmode_supported = CAN_CTRLMODE_LISTENONLY |
 955					      CAN_CTRLMODE_FD |
 956					      CAN_CTRLMODE_FD_NON_ISO |
 957					      CAN_CTRLMODE_CC_LEN8_DLC;
 958
 959		status = ioread32(can->reg_base + KVASER_PCIEFD_KCAN_STAT_REG);
 960		if (!(status & KVASER_PCIEFD_KCAN_STAT_FD)) {
 961			dev_err(&pcie->pci->dev,
 962				"CAN FD not supported as expected %d\n", i);
 963
 964			free_candev(netdev);
 965			return -ENODEV;
 966		}
 967
 968		if (status & KVASER_PCIEFD_KCAN_STAT_CAP)
 969			can->can.ctrlmode_supported |= CAN_CTRLMODE_ONE_SHOT;
 970
 971		netdev->flags |= IFF_ECHO;
 972		SET_NETDEV_DEV(netdev, &pcie->pci->dev);
 973
 974		iowrite32(GENMASK(31, 0), can->reg_base + KVASER_PCIEFD_KCAN_IRQ_REG);
 975		iowrite32(KVASER_PCIEFD_KCAN_IRQ_ABD,
 976			  can->reg_base + KVASER_PCIEFD_KCAN_IEN_REG);
 977
 978		pcie->can[i] = can;
 979		kvaser_pciefd_pwm_start(can);
 980	}
 981
 982	return 0;
 983}
 984
 985static int kvaser_pciefd_reg_candev(struct kvaser_pciefd *pcie)
 986{
 987	int i;
 988
 989	for (i = 0; i < pcie->nr_channels; i++) {
 990		int err = register_candev(pcie->can[i]->can.dev);
 991
 992		if (err) {
 993			int j;
 994
 995			/* Unregister all successfully registered devices. */
 996			for (j = 0; j < i; j++)
 997				unregister_candev(pcie->can[j]->can.dev);
 998			return err;
 999		}
1000	}
1001
1002	return 0;
1003}
1004
1005static void kvaser_pciefd_write_dma_map_altera(struct kvaser_pciefd *pcie,
1006					       dma_addr_t addr, int index)
1007{
1008	void __iomem *serdes_base;
1009	u32 word1, word2;
1010
1011#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
1012	word1 = addr | KVASER_PCIEFD_ALTERA_DMA_64BIT;
1013	word2 = addr >> 32;
1014#else
1015	word1 = addr;
1016	word2 = 0;
1017#endif
1018	serdes_base = KVASER_PCIEFD_SERDES_ADDR(pcie) + 0x8 * index;
1019	iowrite32(word1, serdes_base);
1020	iowrite32(word2, serdes_base + 0x4);
1021}
1022
1023static void kvaser_pciefd_write_dma_map_sf2(struct kvaser_pciefd *pcie,
1024					    dma_addr_t addr, int index)
1025{
1026	void __iomem *serdes_base;
1027	u32 lsb = addr & KVASER_PCIEFD_SF2_DMA_LSB_MASK;
1028	u32 msb = 0x0;
1029
1030#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
1031	msb = addr >> 32;
1032#endif
1033	serdes_base = KVASER_PCIEFD_SERDES_ADDR(pcie) + 0x10 * index;
1034	iowrite32(lsb, serdes_base);
1035	iowrite32(msb, serdes_base + 0x4);
1036}
1037
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1038static int kvaser_pciefd_setup_dma(struct kvaser_pciefd *pcie)
1039{
1040	int i;
1041	u32 srb_status;
1042	u32 srb_packet_count;
1043	dma_addr_t dma_addr[KVASER_PCIEFD_DMA_COUNT];
1044
1045	/* Disable the DMA */
1046	iowrite32(0, KVASER_PCIEFD_SRB_ADDR(pcie) + KVASER_PCIEFD_SRB_CTRL_REG);
 
 
 
1047	for (i = 0; i < KVASER_PCIEFD_DMA_COUNT; i++) {
1048		pcie->dma_data[i] = dmam_alloc_coherent(&pcie->pci->dev,
1049							KVASER_PCIEFD_DMA_SIZE,
1050							&dma_addr[i],
1051							GFP_KERNEL);
1052
1053		if (!pcie->dma_data[i] || !dma_addr[i]) {
1054			dev_err(&pcie->pci->dev, "Rx dma_alloc(%u) failure\n",
1055				KVASER_PCIEFD_DMA_SIZE);
1056			return -ENOMEM;
1057		}
1058		pcie->driver_data->ops->kvaser_pciefd_write_dma_map(pcie, dma_addr[i], i);
1059	}
1060
1061	/* Reset Rx FIFO, and both DMA buffers */
1062	iowrite32(KVASER_PCIEFD_SRB_CMD_FOR | KVASER_PCIEFD_SRB_CMD_RDB0 |
1063		  KVASER_PCIEFD_SRB_CMD_RDB1,
1064		  KVASER_PCIEFD_SRB_ADDR(pcie) + KVASER_PCIEFD_SRB_CMD_REG);
1065	/* Empty Rx FIFO */
1066	srb_packet_count =
1067		FIELD_GET(KVASER_PCIEFD_SRB_RX_NR_PACKETS_MASK,
1068			  ioread32(KVASER_PCIEFD_SRB_ADDR(pcie) +
1069				   KVASER_PCIEFD_SRB_RX_NR_PACKETS_REG));
1070	while (srb_packet_count) {
1071		/* Drop current packet in FIFO */
1072		ioread32(KVASER_PCIEFD_SRB_FIFO_ADDR(pcie) + KVASER_PCIEFD_SRB_FIFO_LAST_REG);
1073		srb_packet_count--;
1074	}
1075
1076	srb_status = ioread32(KVASER_PCIEFD_SRB_ADDR(pcie) + KVASER_PCIEFD_SRB_STAT_REG);
1077	if (!(srb_status & KVASER_PCIEFD_SRB_STAT_DI)) {
1078		dev_err(&pcie->pci->dev, "DMA not idle before enabling\n");
1079		return -EIO;
1080	}
1081
1082	/* Enable the DMA */
1083	iowrite32(KVASER_PCIEFD_SRB_CTRL_DMA_ENABLE,
1084		  KVASER_PCIEFD_SRB_ADDR(pcie) + KVASER_PCIEFD_SRB_CTRL_REG);
1085
1086	return 0;
1087}
1088
1089static int kvaser_pciefd_setup_board(struct kvaser_pciefd *pcie)
1090{
1091	u32 version, srb_status, build;
1092
1093	version = ioread32(KVASER_PCIEFD_SYSID_ADDR(pcie) + KVASER_PCIEFD_SYSID_VERSION_REG);
1094	pcie->nr_channels = min(KVASER_PCIEFD_MAX_CAN_CHANNELS,
1095				FIELD_GET(KVASER_PCIEFD_SYSID_VERSION_NR_CHAN_MASK, version));
1096
1097	build = ioread32(KVASER_PCIEFD_SYSID_ADDR(pcie) + KVASER_PCIEFD_SYSID_BUILD_REG);
1098	dev_dbg(&pcie->pci->dev, "Version %lu.%lu.%lu\n",
1099		FIELD_GET(KVASER_PCIEFD_SYSID_VERSION_MAJOR_MASK, version),
1100		FIELD_GET(KVASER_PCIEFD_SYSID_VERSION_MINOR_MASK, version),
1101		FIELD_GET(KVASER_PCIEFD_SYSID_BUILD_SEQ_MASK, build));
1102
1103	srb_status = ioread32(KVASER_PCIEFD_SRB_ADDR(pcie) + KVASER_PCIEFD_SRB_STAT_REG);
1104	if (!(srb_status & KVASER_PCIEFD_SRB_STAT_DMA)) {
1105		dev_err(&pcie->pci->dev, "Hardware without DMA is not supported\n");
1106		return -ENODEV;
1107	}
1108
1109	pcie->bus_freq = ioread32(KVASER_PCIEFD_SYSID_ADDR(pcie) + KVASER_PCIEFD_SYSID_BUSFREQ_REG);
1110	pcie->freq = ioread32(KVASER_PCIEFD_SYSID_ADDR(pcie) + KVASER_PCIEFD_SYSID_CANFREQ_REG);
1111	pcie->freq_to_ticks_div = pcie->freq / 1000000;
1112	if (pcie->freq_to_ticks_div == 0)
1113		pcie->freq_to_ticks_div = 1;
1114	/* Turn off all loopback functionality */
1115	iowrite32(0, KVASER_PCIEFD_LOOPBACK_ADDR(pcie));
1116
1117	return 0;
1118}
1119
1120static int kvaser_pciefd_handle_data_packet(struct kvaser_pciefd *pcie,
1121					    struct kvaser_pciefd_rx_packet *p,
1122					    __le32 *data)
1123{
1124	struct sk_buff *skb;
1125	struct canfd_frame *cf;
1126	struct can_priv *priv;
1127	u8 ch_id = FIELD_GET(KVASER_PCIEFD_PACKET_CHID_MASK, p->header[1]);
1128	u8 dlc;
1129
1130	if (ch_id >= pcie->nr_channels)
1131		return -EIO;
1132
1133	priv = &pcie->can[ch_id]->can;
1134	dlc = FIELD_GET(KVASER_PCIEFD_RPACKET_DLC_MASK, p->header[1]);
1135
1136	if (p->header[1] & KVASER_PCIEFD_RPACKET_FDF) {
1137		skb = alloc_canfd_skb(priv->dev, &cf);
1138		if (!skb) {
1139			priv->dev->stats.rx_dropped++;
1140			return -ENOMEM;
1141		}
1142
1143		cf->len = can_fd_dlc2len(dlc);
1144		if (p->header[1] & KVASER_PCIEFD_RPACKET_BRS)
1145			cf->flags |= CANFD_BRS;
1146		if (p->header[1] & KVASER_PCIEFD_RPACKET_ESI)
1147			cf->flags |= CANFD_ESI;
1148	} else {
1149		skb = alloc_can_skb(priv->dev, (struct can_frame **)&cf);
1150		if (!skb) {
1151			priv->dev->stats.rx_dropped++;
1152			return -ENOMEM;
1153		}
1154		can_frame_set_cc_len((struct can_frame *)cf, dlc, priv->ctrlmode);
1155	}
1156
1157	cf->can_id = FIELD_GET(KVASER_PCIEFD_RPACKET_ID_MASK, p->header[0]);
1158	if (p->header[0] & KVASER_PCIEFD_RPACKET_IDE)
1159		cf->can_id |= CAN_EFF_FLAG;
1160
1161	if (p->header[0] & KVASER_PCIEFD_RPACKET_RTR) {
1162		cf->can_id |= CAN_RTR_FLAG;
1163	} else {
1164		memcpy(cf->data, data, cf->len);
1165		priv->dev->stats.rx_bytes += cf->len;
1166	}
1167	priv->dev->stats.rx_packets++;
1168	kvaser_pciefd_set_skb_timestamp(pcie, skb, p->timestamp);
1169
1170	return netif_rx(skb);
1171}
1172
1173static void kvaser_pciefd_change_state(struct kvaser_pciefd_can *can,
1174				       struct can_frame *cf,
1175				       enum can_state new_state,
1176				       enum can_state tx_state,
1177				       enum can_state rx_state)
1178{
1179	can_change_state(can->can.dev, cf, tx_state, rx_state);
1180
1181	if (new_state == CAN_STATE_BUS_OFF) {
1182		struct net_device *ndev = can->can.dev;
1183		unsigned long irq_flags;
1184
1185		spin_lock_irqsave(&can->lock, irq_flags);
1186		netif_stop_queue(can->can.dev);
1187		spin_unlock_irqrestore(&can->lock, irq_flags);
1188		/* Prevent CAN controller from auto recover from bus off */
1189		if (!can->can.restart_ms) {
1190			kvaser_pciefd_start_controller_flush(can);
1191			can_bus_off(ndev);
1192		}
1193	}
1194}
1195
1196static void kvaser_pciefd_packet_to_state(struct kvaser_pciefd_rx_packet *p,
1197					  struct can_berr_counter *bec,
1198					  enum can_state *new_state,
1199					  enum can_state *tx_state,
1200					  enum can_state *rx_state)
1201{
1202	if (p->header[0] & KVASER_PCIEFD_SPACK_BOFF ||
1203	    p->header[0] & KVASER_PCIEFD_SPACK_IRM)
1204		*new_state = CAN_STATE_BUS_OFF;
1205	else if (bec->txerr >= 255 || bec->rxerr >= 255)
1206		*new_state = CAN_STATE_BUS_OFF;
1207	else if (p->header[1] & KVASER_PCIEFD_SPACK_EPLR)
1208		*new_state = CAN_STATE_ERROR_PASSIVE;
1209	else if (bec->txerr >= 128 || bec->rxerr >= 128)
1210		*new_state = CAN_STATE_ERROR_PASSIVE;
1211	else if (p->header[1] & KVASER_PCIEFD_SPACK_EWLR)
1212		*new_state = CAN_STATE_ERROR_WARNING;
1213	else if (bec->txerr >= 96 || bec->rxerr >= 96)
1214		*new_state = CAN_STATE_ERROR_WARNING;
1215	else
1216		*new_state = CAN_STATE_ERROR_ACTIVE;
1217
1218	*tx_state = bec->txerr >= bec->rxerr ? *new_state : 0;
1219	*rx_state = bec->txerr <= bec->rxerr ? *new_state : 0;
1220}
1221
1222static int kvaser_pciefd_rx_error_frame(struct kvaser_pciefd_can *can,
1223					struct kvaser_pciefd_rx_packet *p)
1224{
1225	struct can_berr_counter bec;
1226	enum can_state old_state, new_state, tx_state, rx_state;
1227	struct net_device *ndev = can->can.dev;
1228	struct sk_buff *skb;
1229	struct can_frame *cf = NULL;
1230
1231	old_state = can->can.state;
1232
1233	bec.txerr = FIELD_GET(KVASER_PCIEFD_SPACK_TXERR_MASK, p->header[0]);
1234	bec.rxerr = FIELD_GET(KVASER_PCIEFD_SPACK_RXERR_MASK, p->header[0]);
1235
1236	kvaser_pciefd_packet_to_state(p, &bec, &new_state, &tx_state, &rx_state);
1237	skb = alloc_can_err_skb(ndev, &cf);
1238	if (new_state != old_state) {
1239		kvaser_pciefd_change_state(can, cf, new_state, tx_state, rx_state);
1240		if (old_state == CAN_STATE_BUS_OFF &&
1241		    new_state == CAN_STATE_ERROR_ACTIVE &&
1242		    can->can.restart_ms) {
1243			can->can.can_stats.restarts++;
1244			if (skb)
1245				cf->can_id |= CAN_ERR_RESTARTED;
1246		}
1247	}
1248
1249	can->err_rep_cnt++;
1250	can->can.can_stats.bus_error++;
1251	if (p->header[1] & KVASER_PCIEFD_EPACK_DIR_TX)
1252		ndev->stats.tx_errors++;
1253	else
1254		ndev->stats.rx_errors++;
1255
1256	can->bec.txerr = bec.txerr;
1257	can->bec.rxerr = bec.rxerr;
1258
1259	if (!skb) {
1260		ndev->stats.rx_dropped++;
1261		return -ENOMEM;
1262	}
1263
1264	kvaser_pciefd_set_skb_timestamp(can->kv_pcie, skb, p->timestamp);
1265	cf->can_id |= CAN_ERR_BUSERROR | CAN_ERR_CNT;
1266	cf->data[6] = bec.txerr;
1267	cf->data[7] = bec.rxerr;
1268
1269	netif_rx(skb);
1270
1271	return 0;
1272}
1273
1274static int kvaser_pciefd_handle_error_packet(struct kvaser_pciefd *pcie,
1275					     struct kvaser_pciefd_rx_packet *p)
1276{
1277	struct kvaser_pciefd_can *can;
1278	u8 ch_id = FIELD_GET(KVASER_PCIEFD_PACKET_CHID_MASK, p->header[1]);
1279
1280	if (ch_id >= pcie->nr_channels)
1281		return -EIO;
1282
1283	can = pcie->can[ch_id];
1284	kvaser_pciefd_rx_error_frame(can, p);
1285	if (can->err_rep_cnt >= KVASER_PCIEFD_MAX_ERR_REP)
1286		/* Do not report more errors, until bec_poll_timer expires */
1287		kvaser_pciefd_disable_err_gen(can);
1288	/* Start polling the error counters */
1289	mod_timer(&can->bec_poll_timer, KVASER_PCIEFD_BEC_POLL_FREQ);
1290
1291	return 0;
1292}
1293
1294static int kvaser_pciefd_handle_status_resp(struct kvaser_pciefd_can *can,
1295					    struct kvaser_pciefd_rx_packet *p)
1296{
1297	struct can_berr_counter bec;
1298	enum can_state old_state, new_state, tx_state, rx_state;
1299
1300	old_state = can->can.state;
1301
1302	bec.txerr = FIELD_GET(KVASER_PCIEFD_SPACK_TXERR_MASK, p->header[0]);
1303	bec.rxerr = FIELD_GET(KVASER_PCIEFD_SPACK_RXERR_MASK, p->header[0]);
1304
1305	kvaser_pciefd_packet_to_state(p, &bec, &new_state, &tx_state, &rx_state);
1306	if (new_state != old_state) {
1307		struct net_device *ndev = can->can.dev;
1308		struct sk_buff *skb;
1309		struct can_frame *cf;
1310
1311		skb = alloc_can_err_skb(ndev, &cf);
1312		if (!skb) {
1313			ndev->stats.rx_dropped++;
1314			return -ENOMEM;
1315		}
1316
1317		kvaser_pciefd_change_state(can, cf, new_state, tx_state, rx_state);
1318		if (old_state == CAN_STATE_BUS_OFF &&
1319		    new_state == CAN_STATE_ERROR_ACTIVE &&
1320		    can->can.restart_ms) {
1321			can->can.can_stats.restarts++;
1322			cf->can_id |= CAN_ERR_RESTARTED;
1323		}
1324
1325		kvaser_pciefd_set_skb_timestamp(can->kv_pcie, skb, p->timestamp);
1326
1327		cf->data[6] = bec.txerr;
1328		cf->data[7] = bec.rxerr;
1329
1330		netif_rx(skb);
1331	}
1332	can->bec.txerr = bec.txerr;
1333	can->bec.rxerr = bec.rxerr;
1334	/* Check if we need to poll the error counters */
1335	if (bec.txerr || bec.rxerr)
1336		mod_timer(&can->bec_poll_timer, KVASER_PCIEFD_BEC_POLL_FREQ);
1337
1338	return 0;
1339}
1340
1341static int kvaser_pciefd_handle_status_packet(struct kvaser_pciefd *pcie,
1342					      struct kvaser_pciefd_rx_packet *p)
1343{
1344	struct kvaser_pciefd_can *can;
1345	u8 cmdseq;
1346	u32 status;
1347	u8 ch_id = FIELD_GET(KVASER_PCIEFD_PACKET_CHID_MASK, p->header[1]);
1348
1349	if (ch_id >= pcie->nr_channels)
1350		return -EIO;
1351
1352	can = pcie->can[ch_id];
1353
1354	status = ioread32(can->reg_base + KVASER_PCIEFD_KCAN_STAT_REG);
1355	cmdseq = FIELD_GET(KVASER_PCIEFD_KCAN_STAT_SEQNO_MASK, status);
1356
1357	/* Reset done, start abort and flush */
1358	if (p->header[0] & KVASER_PCIEFD_SPACK_IRM &&
1359	    p->header[0] & KVASER_PCIEFD_SPACK_RMCD &&
1360	    p->header[1] & KVASER_PCIEFD_SPACK_AUTO &&
1361	    cmdseq == FIELD_GET(KVASER_PCIEFD_PACKET_SEQ_MASK, p->header[1]) &&
1362	    status & KVASER_PCIEFD_KCAN_STAT_IDLE) {
1363		iowrite32(KVASER_PCIEFD_KCAN_IRQ_ABD,
1364			  can->reg_base + KVASER_PCIEFD_KCAN_IRQ_REG);
1365		kvaser_pciefd_abort_flush_reset(can);
1366	} else if (p->header[0] & KVASER_PCIEFD_SPACK_IDET &&
1367		   p->header[0] & KVASER_PCIEFD_SPACK_IRM &&
1368		   cmdseq == FIELD_GET(KVASER_PCIEFD_PACKET_SEQ_MASK, p->header[1]) &&
1369		   status & KVASER_PCIEFD_KCAN_STAT_IDLE) {
1370		/* Reset detected, send end of flush if no packet are in FIFO */
1371		u8 count;
1372
1373		count = FIELD_GET(KVASER_PCIEFD_KCAN_TX_NR_PACKETS_CURRENT_MASK,
1374				  ioread32(can->reg_base + KVASER_PCIEFD_KCAN_TX_NR_PACKETS_REG));
1375		if (!count)
1376			iowrite32(FIELD_PREP(KVASER_PCIEFD_KCAN_CTRL_TYPE_MASK,
1377					     KVASER_PCIEFD_KCAN_CTRL_TYPE_EFLUSH),
1378				  can->reg_base + KVASER_PCIEFD_KCAN_CTRL_REG);
1379	} else if (!(p->header[1] & KVASER_PCIEFD_SPACK_AUTO) &&
1380		   cmdseq == FIELD_GET(KVASER_PCIEFD_PACKET_SEQ_MASK, p->header[1])) {
1381		/* Response to status request received */
1382		kvaser_pciefd_handle_status_resp(can, p);
1383		if (can->can.state != CAN_STATE_BUS_OFF &&
1384		    can->can.state != CAN_STATE_ERROR_ACTIVE) {
1385			mod_timer(&can->bec_poll_timer, KVASER_PCIEFD_BEC_POLL_FREQ);
1386		}
1387	} else if (p->header[0] & KVASER_PCIEFD_SPACK_RMCD &&
1388		   !(status & KVASER_PCIEFD_KCAN_STAT_BUS_OFF_MASK)) {
1389		/* Reset to bus on detected */
1390		if (!completion_done(&can->start_comp))
1391			complete(&can->start_comp);
1392	}
1393
1394	return 0;
1395}
1396
1397static void kvaser_pciefd_handle_nack_packet(struct kvaser_pciefd_can *can,
1398					     struct kvaser_pciefd_rx_packet *p)
1399{
1400	struct sk_buff *skb;
1401	struct can_frame *cf;
1402
1403	skb = alloc_can_err_skb(can->can.dev, &cf);
1404	can->can.dev->stats.tx_errors++;
1405	if (p->header[0] & KVASER_PCIEFD_APACKET_ABL) {
1406		if (skb)
1407			cf->can_id |= CAN_ERR_LOSTARB;
1408		can->can.can_stats.arbitration_lost++;
1409	} else if (skb) {
1410		cf->can_id |= CAN_ERR_ACK;
1411	}
1412
1413	if (skb) {
1414		cf->can_id |= CAN_ERR_BUSERROR;
1415		kvaser_pciefd_set_skb_timestamp(can->kv_pcie, skb, p->timestamp);
1416		netif_rx(skb);
1417	} else {
1418		can->can.dev->stats.rx_dropped++;
1419		netdev_warn(can->can.dev, "No memory left for err_skb\n");
1420	}
1421}
1422
1423static int kvaser_pciefd_handle_ack_packet(struct kvaser_pciefd *pcie,
1424					   struct kvaser_pciefd_rx_packet *p)
1425{
1426	struct kvaser_pciefd_can *can;
1427	bool one_shot_fail = false;
1428	u8 ch_id = FIELD_GET(KVASER_PCIEFD_PACKET_CHID_MASK, p->header[1]);
1429
1430	if (ch_id >= pcie->nr_channels)
1431		return -EIO;
1432
1433	can = pcie->can[ch_id];
1434	/* Ignore control packet ACK */
1435	if (p->header[0] & KVASER_PCIEFD_APACKET_CT)
1436		return 0;
1437
1438	if (p->header[0] & KVASER_PCIEFD_APACKET_NACK) {
1439		kvaser_pciefd_handle_nack_packet(can, p);
1440		one_shot_fail = true;
1441	}
1442
1443	if (p->header[0] & KVASER_PCIEFD_APACKET_FLU) {
1444		netdev_dbg(can->can.dev, "Packet was flushed\n");
1445	} else {
1446		int echo_idx = FIELD_GET(KVASER_PCIEFD_PACKET_SEQ_MASK, p->header[0]);
1447		int len;
1448		u8 count;
1449		struct sk_buff *skb;
1450
1451		skb = can->can.echo_skb[echo_idx];
1452		if (skb)
1453			kvaser_pciefd_set_skb_timestamp(pcie, skb, p->timestamp);
1454		len = can_get_echo_skb(can->can.dev, echo_idx, NULL);
1455		count = FIELD_GET(KVASER_PCIEFD_KCAN_TX_NR_PACKETS_CURRENT_MASK,
1456				  ioread32(can->reg_base + KVASER_PCIEFD_KCAN_TX_NR_PACKETS_REG));
1457
1458		if (count < can->can.echo_skb_max && netif_queue_stopped(can->can.dev))
1459			netif_wake_queue(can->can.dev);
1460
1461		if (!one_shot_fail) {
1462			can->can.dev->stats.tx_bytes += len;
1463			can->can.dev->stats.tx_packets++;
1464		}
1465	}
1466
1467	return 0;
1468}
1469
1470static int kvaser_pciefd_handle_eflush_packet(struct kvaser_pciefd *pcie,
1471					      struct kvaser_pciefd_rx_packet *p)
1472{
1473	struct kvaser_pciefd_can *can;
1474	u8 ch_id = FIELD_GET(KVASER_PCIEFD_PACKET_CHID_MASK, p->header[1]);
1475
1476	if (ch_id >= pcie->nr_channels)
1477		return -EIO;
1478
1479	can = pcie->can[ch_id];
1480
1481	if (!completion_done(&can->flush_comp))
1482		complete(&can->flush_comp);
1483
1484	return 0;
1485}
1486
1487static int kvaser_pciefd_read_packet(struct kvaser_pciefd *pcie, int *start_pos,
1488				     int dma_buf)
1489{
1490	__le32 *buffer = pcie->dma_data[dma_buf];
1491	__le64 timestamp;
1492	struct kvaser_pciefd_rx_packet packet;
1493	struct kvaser_pciefd_rx_packet *p = &packet;
1494	u8 type;
1495	int pos = *start_pos;
1496	int size;
1497	int ret = 0;
1498
1499	size = le32_to_cpu(buffer[pos++]);
1500	if (!size) {
1501		*start_pos = 0;
1502		return 0;
1503	}
1504
1505	p->header[0] = le32_to_cpu(buffer[pos++]);
1506	p->header[1] = le32_to_cpu(buffer[pos++]);
1507
1508	/* Read 64-bit timestamp */
1509	memcpy(&timestamp, &buffer[pos], sizeof(__le64));
1510	pos += 2;
1511	p->timestamp = le64_to_cpu(timestamp);
1512
1513	type = FIELD_GET(KVASER_PCIEFD_PACKET_TYPE_MASK, p->header[1]);
1514	switch (type) {
1515	case KVASER_PCIEFD_PACK_TYPE_DATA:
1516		ret = kvaser_pciefd_handle_data_packet(pcie, p, &buffer[pos]);
1517		if (!(p->header[0] & KVASER_PCIEFD_RPACKET_RTR)) {
1518			u8 data_len;
1519
1520			data_len = can_fd_dlc2len(FIELD_GET(KVASER_PCIEFD_RPACKET_DLC_MASK,
1521							    p->header[1]));
1522			pos += DIV_ROUND_UP(data_len, 4);
1523		}
1524		break;
1525
1526	case KVASER_PCIEFD_PACK_TYPE_ACK:
1527		ret = kvaser_pciefd_handle_ack_packet(pcie, p);
1528		break;
1529
1530	case KVASER_PCIEFD_PACK_TYPE_STATUS:
1531		ret = kvaser_pciefd_handle_status_packet(pcie, p);
1532		break;
1533
1534	case KVASER_PCIEFD_PACK_TYPE_ERROR:
1535		ret = kvaser_pciefd_handle_error_packet(pcie, p);
1536		break;
1537
1538	case KVASER_PCIEFD_PACK_TYPE_EFLUSH_ACK:
1539		ret = kvaser_pciefd_handle_eflush_packet(pcie, p);
1540		break;
1541
1542	case KVASER_PCIEFD_PACK_TYPE_ACK_DATA:
1543	case KVASER_PCIEFD_PACK_TYPE_BUS_LOAD:
1544	case KVASER_PCIEFD_PACK_TYPE_EFRAME_ACK:
1545	case KVASER_PCIEFD_PACK_TYPE_TXRQ:
1546		dev_info(&pcie->pci->dev,
1547			 "Received unexpected packet type 0x%08X\n", type);
1548		break;
1549
1550	default:
1551		dev_err(&pcie->pci->dev, "Unknown packet type 0x%08X\n", type);
1552		ret = -EIO;
1553		break;
1554	}
1555
1556	if (ret)
1557		return ret;
1558
1559	/* Position does not point to the end of the package,
1560	 * corrupted packet size?
1561	 */
1562	if ((*start_pos + size) != pos)
1563		return -EIO;
1564
1565	/* Point to the next packet header, if any */
1566	*start_pos = pos;
1567
1568	return ret;
1569}
1570
1571static int kvaser_pciefd_read_buffer(struct kvaser_pciefd *pcie, int dma_buf)
1572{
1573	int pos = 0;
1574	int res = 0;
1575
1576	do {
1577		res = kvaser_pciefd_read_packet(pcie, &pos, dma_buf);
1578	} while (!res && pos > 0 && pos < KVASER_PCIEFD_DMA_SIZE);
1579
1580	return res;
1581}
1582
1583static void kvaser_pciefd_receive_irq(struct kvaser_pciefd *pcie)
1584{
1585	u32 irq = ioread32(KVASER_PCIEFD_SRB_ADDR(pcie) + KVASER_PCIEFD_SRB_IRQ_REG);
1586
1587	if (irq & KVASER_PCIEFD_SRB_IRQ_DPD0) {
1588		kvaser_pciefd_read_buffer(pcie, 0);
1589		/* Reset DMA buffer 0 */
1590		iowrite32(KVASER_PCIEFD_SRB_CMD_RDB0,
1591			  KVASER_PCIEFD_SRB_ADDR(pcie) + KVASER_PCIEFD_SRB_CMD_REG);
1592	}
1593
1594	if (irq & KVASER_PCIEFD_SRB_IRQ_DPD1) {
1595		kvaser_pciefd_read_buffer(pcie, 1);
1596		/* Reset DMA buffer 1 */
1597		iowrite32(KVASER_PCIEFD_SRB_CMD_RDB1,
1598			  KVASER_PCIEFD_SRB_ADDR(pcie) + KVASER_PCIEFD_SRB_CMD_REG);
1599	}
1600
1601	if (irq & KVASER_PCIEFD_SRB_IRQ_DOF0 ||
1602	    irq & KVASER_PCIEFD_SRB_IRQ_DOF1 ||
1603	    irq & KVASER_PCIEFD_SRB_IRQ_DUF0 ||
1604	    irq & KVASER_PCIEFD_SRB_IRQ_DUF1)
1605		dev_err(&pcie->pci->dev, "DMA IRQ error 0x%08X\n", irq);
1606
1607	iowrite32(irq, KVASER_PCIEFD_SRB_ADDR(pcie) + KVASER_PCIEFD_SRB_IRQ_REG);
 
1608}
1609
1610static void kvaser_pciefd_transmit_irq(struct kvaser_pciefd_can *can)
1611{
1612	u32 irq = ioread32(can->reg_base + KVASER_PCIEFD_KCAN_IRQ_REG);
1613
1614	if (irq & KVASER_PCIEFD_KCAN_IRQ_TOF)
1615		netdev_err(can->can.dev, "Tx FIFO overflow\n");
1616
1617	if (irq & KVASER_PCIEFD_KCAN_IRQ_BPP)
1618		netdev_err(can->can.dev,
1619			   "Fail to change bittiming, when not in reset mode\n");
1620
1621	if (irq & KVASER_PCIEFD_KCAN_IRQ_FDIC)
1622		netdev_err(can->can.dev, "CAN FD frame in CAN mode\n");
1623
1624	if (irq & KVASER_PCIEFD_KCAN_IRQ_ROF)
1625		netdev_err(can->can.dev, "Rx FIFO overflow\n");
1626
1627	iowrite32(irq, can->reg_base + KVASER_PCIEFD_KCAN_IRQ_REG);
1628}
1629
1630static irqreturn_t kvaser_pciefd_irq_handler(int irq, void *dev)
1631{
1632	struct kvaser_pciefd *pcie = (struct kvaser_pciefd *)dev;
1633	const struct kvaser_pciefd_irq_mask *irq_mask = pcie->driver_data->irq_mask;
1634	u32 board_irq = ioread32(KVASER_PCIEFD_PCI_IRQ_ADDR(pcie));
 
 
1635	int i;
1636
1637	if (!(board_irq & irq_mask->all))
1638		return IRQ_NONE;
1639
1640	if (board_irq & irq_mask->kcan_rx0)
1641		kvaser_pciefd_receive_irq(pcie);
1642
1643	for (i = 0; i < pcie->nr_channels; i++) {
1644		if (!pcie->can[i]) {
1645			dev_err(&pcie->pci->dev,
1646				"IRQ mask points to unallocated controller\n");
1647			break;
1648		}
1649
1650		/* Check that mask matches channel (i) IRQ mask */
1651		if (board_irq & irq_mask->kcan_tx[i])
1652			kvaser_pciefd_transmit_irq(pcie->can[i]);
1653	}
1654
 
 
 
 
 
 
 
 
 
1655	return IRQ_HANDLED;
1656}
1657
1658static void kvaser_pciefd_teardown_can_ctrls(struct kvaser_pciefd *pcie)
1659{
1660	int i;
1661
1662	for (i = 0; i < pcie->nr_channels; i++) {
1663		struct kvaser_pciefd_can *can = pcie->can[i];
1664
1665		if (can) {
1666			iowrite32(0, can->reg_base + KVASER_PCIEFD_KCAN_IEN_REG);
1667			kvaser_pciefd_pwm_stop(can);
1668			free_candev(can->can.dev);
1669		}
1670	}
1671}
1672
1673static int kvaser_pciefd_probe(struct pci_dev *pdev,
1674			       const struct pci_device_id *id)
1675{
1676	int err;
1677	struct kvaser_pciefd *pcie;
1678	const struct kvaser_pciefd_irq_mask *irq_mask;
1679	void __iomem *irq_en_base;
1680
1681	pcie = devm_kzalloc(&pdev->dev, sizeof(*pcie), GFP_KERNEL);
1682	if (!pcie)
1683		return -ENOMEM;
1684
1685	pci_set_drvdata(pdev, pcie);
1686	pcie->pci = pdev;
1687	pcie->driver_data = (const struct kvaser_pciefd_driver_data *)id->driver_data;
1688	irq_mask = pcie->driver_data->irq_mask;
1689
1690	err = pci_enable_device(pdev);
1691	if (err)
1692		return err;
1693
1694	err = pci_request_regions(pdev, KVASER_PCIEFD_DRV_NAME);
1695	if (err)
1696		goto err_disable_pci;
1697
1698	pcie->reg_base = pci_iomap(pdev, 0, 0);
1699	if (!pcie->reg_base) {
1700		err = -ENOMEM;
1701		goto err_release_regions;
1702	}
1703
1704	err = kvaser_pciefd_setup_board(pcie);
1705	if (err)
1706		goto err_pci_iounmap;
1707
1708	err = kvaser_pciefd_setup_dma(pcie);
1709	if (err)
1710		goto err_pci_iounmap;
1711
1712	pci_set_master(pdev);
1713
1714	err = kvaser_pciefd_setup_can_ctrls(pcie);
1715	if (err)
1716		goto err_teardown_can_ctrls;
1717
1718	err = request_irq(pcie->pci->irq, kvaser_pciefd_irq_handler,
1719			  IRQF_SHARED, KVASER_PCIEFD_DRV_NAME, pcie);
1720	if (err)
1721		goto err_teardown_can_ctrls;
 
 
 
 
 
1722
 
 
 
 
 
 
 
 
1723	iowrite32(KVASER_PCIEFD_SRB_IRQ_DPD0 | KVASER_PCIEFD_SRB_IRQ_DPD1,
1724		  KVASER_PCIEFD_SRB_ADDR(pcie) + KVASER_PCIEFD_SRB_IRQ_REG);
1725
1726	iowrite32(KVASER_PCIEFD_SRB_IRQ_DPD0 | KVASER_PCIEFD_SRB_IRQ_DPD1 |
1727		  KVASER_PCIEFD_SRB_IRQ_DOF0 | KVASER_PCIEFD_SRB_IRQ_DOF1 |
1728		  KVASER_PCIEFD_SRB_IRQ_DUF0 | KVASER_PCIEFD_SRB_IRQ_DUF1,
1729		  KVASER_PCIEFD_SRB_ADDR(pcie) + KVASER_PCIEFD_SRB_IEN_REG);
1730
1731	/* Enable PCI interrupts */
1732	irq_en_base = KVASER_PCIEFD_PCI_IEN_ADDR(pcie);
1733	iowrite32(irq_mask->all, irq_en_base);
1734	/* Ready the DMA buffers */
1735	iowrite32(KVASER_PCIEFD_SRB_CMD_RDB0,
1736		  KVASER_PCIEFD_SRB_ADDR(pcie) + KVASER_PCIEFD_SRB_CMD_REG);
1737	iowrite32(KVASER_PCIEFD_SRB_CMD_RDB1,
1738		  KVASER_PCIEFD_SRB_ADDR(pcie) + KVASER_PCIEFD_SRB_CMD_REG);
1739
1740	err = kvaser_pciefd_reg_candev(pcie);
1741	if (err)
1742		goto err_free_irq;
1743
1744	return 0;
1745
1746err_free_irq:
1747	/* Disable PCI interrupts */
1748	iowrite32(0, irq_en_base);
1749	free_irq(pcie->pci->irq, pcie);
1750
 
 
 
1751err_teardown_can_ctrls:
1752	kvaser_pciefd_teardown_can_ctrls(pcie);
1753	iowrite32(0, KVASER_PCIEFD_SRB_ADDR(pcie) + KVASER_PCIEFD_SRB_CTRL_REG);
1754	pci_clear_master(pdev);
1755
1756err_pci_iounmap:
1757	pci_iounmap(pdev, pcie->reg_base);
1758
1759err_release_regions:
1760	pci_release_regions(pdev);
1761
1762err_disable_pci:
1763	pci_disable_device(pdev);
1764
1765	return err;
1766}
1767
1768static void kvaser_pciefd_remove_all_ctrls(struct kvaser_pciefd *pcie)
1769{
1770	int i;
1771
1772	for (i = 0; i < pcie->nr_channels; i++) {
1773		struct kvaser_pciefd_can *can = pcie->can[i];
1774
1775		if (can) {
1776			iowrite32(0, can->reg_base + KVASER_PCIEFD_KCAN_IEN_REG);
1777			unregister_candev(can->can.dev);
1778			del_timer(&can->bec_poll_timer);
1779			kvaser_pciefd_pwm_stop(can);
1780			free_candev(can->can.dev);
1781		}
1782	}
1783}
1784
1785static void kvaser_pciefd_remove(struct pci_dev *pdev)
1786{
1787	struct kvaser_pciefd *pcie = pci_get_drvdata(pdev);
1788
1789	kvaser_pciefd_remove_all_ctrls(pcie);
1790
1791	/* Disable interrupts */
1792	iowrite32(0, KVASER_PCIEFD_SRB_ADDR(pcie) + KVASER_PCIEFD_SRB_CTRL_REG);
1793	iowrite32(0, KVASER_PCIEFD_PCI_IEN_ADDR(pcie));
1794
1795	free_irq(pcie->pci->irq, pcie);
1796
1797	pci_iounmap(pdev, pcie->reg_base);
1798	pci_release_regions(pdev);
1799	pci_disable_device(pdev);
1800}
1801
1802static struct pci_driver kvaser_pciefd = {
1803	.name = KVASER_PCIEFD_DRV_NAME,
1804	.id_table = kvaser_pciefd_id_table,
1805	.probe = kvaser_pciefd_probe,
1806	.remove = kvaser_pciefd_remove,
1807};
1808
1809module_pci_driver(kvaser_pciefd)