linux/drivers/net/can/kvaser_pciefd.c
Christer Beskow ec44dd5790 can: kvaser_pciefd: the PWM generator is running at the bus frequency of the system.
The system clock frequency for the bus connected to the PCIe controller
shall be used when calculating the frequency of the PWM, not the CAN
system clock frequency.

Signed-off-by: Christer Beskow <chbe@kvaser.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
2019-09-03 10:23:57 +02:00

1912 lines
52 KiB
C

// SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause
/* Copyright (C) 2018 KVASER AB, Sweden. All rights reserved.
* Parts of this driver are based on the following:
* - Kvaser linux pciefd driver (version 5.25)
* - PEAK linux canfd driver
* - Altera Avalon EPCS flash controller driver
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/pci.h>
#include <linux/can/dev.h>
#include <linux/timer.h>
#include <linux/netdevice.h>
#include <linux/crc32.h>
#include <linux/iopoll.h>
MODULE_LICENSE("Dual BSD/GPL");
MODULE_AUTHOR("Kvaser AB <support@kvaser.com>");
MODULE_DESCRIPTION("CAN driver for Kvaser CAN/PCIe devices");
#define KVASER_PCIEFD_DRV_NAME "kvaser_pciefd"
#define KVASER_PCIEFD_WAIT_TIMEOUT msecs_to_jiffies(1000)
#define KVASER_PCIEFD_BEC_POLL_FREQ (jiffies + msecs_to_jiffies(200))
#define KVASER_PCIEFD_MAX_ERR_REP 256
#define KVASER_PCIEFD_CAN_TX_MAX_COUNT 17
#define KVASER_PCIEFD_MAX_CAN_CHANNELS 4
#define KVASER_PCIEFD_DMA_COUNT 2
#define KVASER_PCIEFD_DMA_SIZE (4 * 1024)
#define KVASER_PCIEFD_64BIT_DMA_BIT BIT(0)
#define KVASER_PCIEFD_VENDOR 0x1a07
#define KVASER_PCIEFD_4HS_ID 0x0d
#define KVASER_PCIEFD_2HS_ID 0x0e
#define KVASER_PCIEFD_HS_ID 0x0f
#define KVASER_PCIEFD_MINIPCIE_HS_ID 0x10
#define KVASER_PCIEFD_MINIPCIE_2HS_ID 0x11
/* PCIe IRQ registers */
#define KVASER_PCIEFD_IRQ_REG 0x40
#define KVASER_PCIEFD_IEN_REG 0x50
/* DMA map */
#define KVASER_PCIEFD_DMA_MAP_BASE 0x1000
/* Kvaser KCAN CAN controller registers */
#define KVASER_PCIEFD_KCAN0_BASE 0x10000
#define KVASER_PCIEFD_KCAN_BASE_OFFSET 0x1000
#define KVASER_PCIEFD_KCAN_FIFO_REG 0x100
#define KVASER_PCIEFD_KCAN_FIFO_LAST_REG 0x180
#define KVASER_PCIEFD_KCAN_CTRL_REG 0x2c0
#define KVASER_PCIEFD_KCAN_CMD_REG 0x400
#define KVASER_PCIEFD_KCAN_IEN_REG 0x408
#define KVASER_PCIEFD_KCAN_IRQ_REG 0x410
#define KVASER_PCIEFD_KCAN_TX_NPACKETS_REG 0x414
#define KVASER_PCIEFD_KCAN_STAT_REG 0x418
#define KVASER_PCIEFD_KCAN_MODE_REG 0x41c
#define KVASER_PCIEFD_KCAN_BTRN_REG 0x420
#define KVASER_PCIEFD_KCAN_BTRD_REG 0x428
#define KVASER_PCIEFD_KCAN_PWM_REG 0x430
/* Loopback control register */
#define KVASER_PCIEFD_LOOP_REG 0x1f000
/* System identification and information registers */
#define KVASER_PCIEFD_SYSID_BASE 0x1f020
#define KVASER_PCIEFD_SYSID_VERSION_REG (KVASER_PCIEFD_SYSID_BASE + 0x8)
#define KVASER_PCIEFD_SYSID_CANFREQ_REG (KVASER_PCIEFD_SYSID_BASE + 0xc)
#define KVASER_PCIEFD_SYSID_BUSFREQ_REG (KVASER_PCIEFD_SYSID_BASE + 0x10)
#define KVASER_PCIEFD_SYSID_BUILD_REG (KVASER_PCIEFD_SYSID_BASE + 0x14)
/* Shared receive buffer registers */
#define KVASER_PCIEFD_SRB_BASE 0x1f200
#define KVASER_PCIEFD_SRB_CMD_REG (KVASER_PCIEFD_SRB_BASE + 0x200)
#define KVASER_PCIEFD_SRB_IEN_REG (KVASER_PCIEFD_SRB_BASE + 0x204)
#define KVASER_PCIEFD_SRB_IRQ_REG (KVASER_PCIEFD_SRB_BASE + 0x20c)
#define KVASER_PCIEFD_SRB_STAT_REG (KVASER_PCIEFD_SRB_BASE + 0x210)
#define KVASER_PCIEFD_SRB_CTRL_REG (KVASER_PCIEFD_SRB_BASE + 0x218)
/* EPCS flash controller registers */
#define KVASER_PCIEFD_SPI_BASE 0x1fc00
#define KVASER_PCIEFD_SPI_RX_REG KVASER_PCIEFD_SPI_BASE
#define KVASER_PCIEFD_SPI_TX_REG (KVASER_PCIEFD_SPI_BASE + 0x4)
#define KVASER_PCIEFD_SPI_STATUS_REG (KVASER_PCIEFD_SPI_BASE + 0x8)
#define KVASER_PCIEFD_SPI_CTRL_REG (KVASER_PCIEFD_SPI_BASE + 0xc)
#define KVASER_PCIEFD_SPI_SSEL_REG (KVASER_PCIEFD_SPI_BASE + 0x14)
#define KVASER_PCIEFD_IRQ_ALL_MSK 0x1f
#define KVASER_PCIEFD_IRQ_SRB BIT(4)
#define KVASER_PCIEFD_SYSID_NRCHAN_SHIFT 24
#define KVASER_PCIEFD_SYSID_MAJOR_VER_SHIFT 16
#define KVASER_PCIEFD_SYSID_BUILD_VER_SHIFT 1
/* Reset DMA buffer 0, 1 and FIFO offset */
#define KVASER_PCIEFD_SRB_CMD_RDB0 BIT(4)
#define KVASER_PCIEFD_SRB_CMD_RDB1 BIT(5)
#define KVASER_PCIEFD_SRB_CMD_FOR BIT(0)
/* DMA packet done, buffer 0 and 1 */
#define KVASER_PCIEFD_SRB_IRQ_DPD0 BIT(8)
#define KVASER_PCIEFD_SRB_IRQ_DPD1 BIT(9)
/* DMA overflow, buffer 0 and 1 */
#define KVASER_PCIEFD_SRB_IRQ_DOF0 BIT(10)
#define KVASER_PCIEFD_SRB_IRQ_DOF1 BIT(11)
/* DMA underflow, buffer 0 and 1 */
#define KVASER_PCIEFD_SRB_IRQ_DUF0 BIT(12)
#define KVASER_PCIEFD_SRB_IRQ_DUF1 BIT(13)
/* DMA idle */
#define KVASER_PCIEFD_SRB_STAT_DI BIT(15)
/* DMA support */
#define KVASER_PCIEFD_SRB_STAT_DMA BIT(24)
/* DMA Enable */
#define KVASER_PCIEFD_SRB_CTRL_DMA_ENABLE BIT(0)
/* EPCS flash controller definitions */
#define KVASER_PCIEFD_CFG_IMG_SZ (64 * 1024)
#define KVASER_PCIEFD_CFG_IMG_OFFSET (31 * 65536L)
#define KVASER_PCIEFD_CFG_MAX_PARAMS 256
#define KVASER_PCIEFD_CFG_MAGIC 0xcafef00d
#define KVASER_PCIEFD_CFG_PARAM_MAX_SZ 24
#define KVASER_PCIEFD_CFG_SYS_VER 1
#define KVASER_PCIEFD_CFG_PARAM_NR_CHAN 130
#define KVASER_PCIEFD_SPI_TMT BIT(5)
#define KVASER_PCIEFD_SPI_TRDY BIT(6)
#define KVASER_PCIEFD_SPI_RRDY BIT(7)
#define KVASER_PCIEFD_FLASH_ID_EPCS16 0x14
/* Commands for controlling the onboard flash */
#define KVASER_PCIEFD_FLASH_RES_CMD 0xab
#define KVASER_PCIEFD_FLASH_READ_CMD 0x3
#define KVASER_PCIEFD_FLASH_STATUS_CMD 0x5
/* Kvaser KCAN definitions */
#define KVASER_PCIEFD_KCAN_CTRL_EFLUSH (4 << 29)
#define KVASER_PCIEFD_KCAN_CTRL_EFRAME (5 << 29)
#define KVASER_PCIEFD_KCAN_CMD_SEQ_SHIFT 16
/* Request status packet */
#define KVASER_PCIEFD_KCAN_CMD_SRQ BIT(0)
/* Abort, flush and reset */
#define KVASER_PCIEFD_KCAN_CMD_AT BIT(1)
/* Tx FIFO unaligned read */
#define KVASER_PCIEFD_KCAN_IRQ_TAR BIT(0)
/* Tx FIFO unaligned end */
#define KVASER_PCIEFD_KCAN_IRQ_TAE BIT(1)
/* Bus parameter protection error */
#define KVASER_PCIEFD_KCAN_IRQ_BPP BIT(2)
/* FDF bit when controller is in classic mode */
#define KVASER_PCIEFD_KCAN_IRQ_FDIC BIT(3)
/* Rx FIFO overflow */
#define KVASER_PCIEFD_KCAN_IRQ_ROF BIT(5)
/* Abort done */
#define KVASER_PCIEFD_KCAN_IRQ_ABD BIT(13)
/* Tx buffer flush done */
#define KVASER_PCIEFD_KCAN_IRQ_TFD BIT(14)
/* Tx FIFO overflow */
#define KVASER_PCIEFD_KCAN_IRQ_TOF BIT(15)
/* Tx FIFO empty */
#define KVASER_PCIEFD_KCAN_IRQ_TE BIT(16)
/* Transmitter unaligned */
#define KVASER_PCIEFD_KCAN_IRQ_TAL BIT(17)
#define KVASER_PCIEFD_KCAN_TX_NPACKETS_MAX_SHIFT 16
#define KVASER_PCIEFD_KCAN_STAT_SEQNO_SHIFT 24
/* Abort request */
#define KVASER_PCIEFD_KCAN_STAT_AR BIT(7)
/* Idle state. Controller in reset mode and no abort or flush pending */
#define KVASER_PCIEFD_KCAN_STAT_IDLE BIT(10)
/* Bus off */
#define KVASER_PCIEFD_KCAN_STAT_BOFF BIT(11)
/* Reset mode request */
#define KVASER_PCIEFD_KCAN_STAT_RMR BIT(14)
/* Controller in reset mode */
#define KVASER_PCIEFD_KCAN_STAT_IRM BIT(15)
/* Controller got one-shot capability */
#define KVASER_PCIEFD_KCAN_STAT_CAP BIT(16)
/* Controller got CAN FD capability */
#define KVASER_PCIEFD_KCAN_STAT_FD BIT(19)
#define KVASER_PCIEFD_KCAN_STAT_BUS_OFF_MSK (KVASER_PCIEFD_KCAN_STAT_AR | \
KVASER_PCIEFD_KCAN_STAT_BOFF | KVASER_PCIEFD_KCAN_STAT_RMR | \
KVASER_PCIEFD_KCAN_STAT_IRM)
/* Reset mode */
#define KVASER_PCIEFD_KCAN_MODE_RM BIT(8)
/* Listen only mode */
#define KVASER_PCIEFD_KCAN_MODE_LOM BIT(9)
/* Error packet enable */
#define KVASER_PCIEFD_KCAN_MODE_EPEN BIT(12)
/* CAN FD non-ISO */
#define KVASER_PCIEFD_KCAN_MODE_NIFDEN BIT(15)
/* Acknowledgment packet type */
#define KVASER_PCIEFD_KCAN_MODE_APT BIT(20)
/* Active error flag enable. Clear to force error passive */
#define KVASER_PCIEFD_KCAN_MODE_EEN BIT(23)
/* Classic CAN mode */
#define KVASER_PCIEFD_KCAN_MODE_CCM BIT(31)
#define KVASER_PCIEFD_KCAN_BTRN_SJW_SHIFT 13
#define KVASER_PCIEFD_KCAN_BTRN_TSEG1_SHIFT 17
#define KVASER_PCIEFD_KCAN_BTRN_TSEG2_SHIFT 26
#define KVASER_PCIEFD_KCAN_PWM_TOP_SHIFT 16
/* Kvaser KCAN packet types */
#define KVASER_PCIEFD_PACK_TYPE_DATA 0
#define KVASER_PCIEFD_PACK_TYPE_ACK 1
#define KVASER_PCIEFD_PACK_TYPE_TXRQ 2
#define KVASER_PCIEFD_PACK_TYPE_ERROR 3
#define KVASER_PCIEFD_PACK_TYPE_EFLUSH_ACK 4
#define KVASER_PCIEFD_PACK_TYPE_EFRAME_ACK 5
#define KVASER_PCIEFD_PACK_TYPE_ACK_DATA 6
#define KVASER_PCIEFD_PACK_TYPE_STATUS 8
#define KVASER_PCIEFD_PACK_TYPE_BUS_LOAD 9
/* Kvaser KCAN packet common definitions */
#define KVASER_PCIEFD_PACKET_SEQ_MSK 0xff
#define KVASER_PCIEFD_PACKET_CHID_SHIFT 25
#define KVASER_PCIEFD_PACKET_TYPE_SHIFT 28
/* Kvaser KCAN TDATA and RDATA first word */
#define KVASER_PCIEFD_RPACKET_IDE BIT(30)
#define KVASER_PCIEFD_RPACKET_RTR BIT(29)
/* Kvaser KCAN TDATA and RDATA second word */
#define KVASER_PCIEFD_RPACKET_ESI BIT(13)
#define KVASER_PCIEFD_RPACKET_BRS BIT(14)
#define KVASER_PCIEFD_RPACKET_FDF BIT(15)
#define KVASER_PCIEFD_RPACKET_DLC_SHIFT 8
/* Kvaser KCAN TDATA second word */
#define KVASER_PCIEFD_TPACKET_SMS BIT(16)
#define KVASER_PCIEFD_TPACKET_AREQ BIT(31)
/* Kvaser KCAN APACKET */
#define KVASER_PCIEFD_APACKET_FLU BIT(8)
#define KVASER_PCIEFD_APACKET_CT BIT(9)
#define KVASER_PCIEFD_APACKET_ABL BIT(10)
#define KVASER_PCIEFD_APACKET_NACK BIT(11)
/* Kvaser KCAN SPACK first word */
#define KVASER_PCIEFD_SPACK_RXERR_SHIFT 8
#define KVASER_PCIEFD_SPACK_BOFF BIT(16)
#define KVASER_PCIEFD_SPACK_IDET BIT(20)
#define KVASER_PCIEFD_SPACK_IRM BIT(21)
#define KVASER_PCIEFD_SPACK_RMCD BIT(22)
/* Kvaser KCAN SPACK second word */
#define KVASER_PCIEFD_SPACK_AUTO BIT(21)
#define KVASER_PCIEFD_SPACK_EWLR BIT(23)
#define KVASER_PCIEFD_SPACK_EPLR BIT(24)
struct kvaser_pciefd;
struct kvaser_pciefd_can {
struct can_priv can;
struct kvaser_pciefd *kv_pcie;
void __iomem *reg_base;
struct can_berr_counter bec;
u8 cmd_seq;
int err_rep_cnt;
int echo_idx;
spinlock_t lock; /* Locks sensitive registers (e.g. MODE) */
spinlock_t echo_lock; /* Locks the message echo buffer */
struct timer_list bec_poll_timer;
struct completion start_comp, flush_comp;
};
struct kvaser_pciefd {
struct pci_dev *pci;
void __iomem *reg_base;
struct kvaser_pciefd_can *can[KVASER_PCIEFD_MAX_CAN_CHANNELS];
void *dma_data[KVASER_PCIEFD_DMA_COUNT];
u8 nr_channels;
u32 bus_freq;
u32 freq;
u32 freq_to_ticks_div;
};
struct kvaser_pciefd_rx_packet {
u32 header[2];
u64 timestamp;
};
struct kvaser_pciefd_tx_packet {
u32 header[2];
u8 data[64];
};
static const struct can_bittiming_const kvaser_pciefd_bittiming_const = {
.name = KVASER_PCIEFD_DRV_NAME,
.tseg1_min = 1,
.tseg1_max = 255,
.tseg2_min = 1,
.tseg2_max = 32,
.sjw_max = 16,
.brp_min = 1,
.brp_max = 4096,
.brp_inc = 1,
};
struct kvaser_pciefd_cfg_param {
__le32 magic;
__le32 nr;
__le32 len;
u8 data[KVASER_PCIEFD_CFG_PARAM_MAX_SZ];
};
struct kvaser_pciefd_cfg_img {
__le32 version;
__le32 magic;
__le32 crc;
struct kvaser_pciefd_cfg_param params[KVASER_PCIEFD_CFG_MAX_PARAMS];
};
static struct pci_device_id kvaser_pciefd_id_table[] = {
{ PCI_DEVICE(KVASER_PCIEFD_VENDOR, KVASER_PCIEFD_4HS_ID), },
{ PCI_DEVICE(KVASER_PCIEFD_VENDOR, KVASER_PCIEFD_2HS_ID), },
{ PCI_DEVICE(KVASER_PCIEFD_VENDOR, KVASER_PCIEFD_HS_ID), },
{ PCI_DEVICE(KVASER_PCIEFD_VENDOR, KVASER_PCIEFD_MINIPCIE_HS_ID), },
{ PCI_DEVICE(KVASER_PCIEFD_VENDOR, KVASER_PCIEFD_MINIPCIE_2HS_ID), },
{ 0,},
};
MODULE_DEVICE_TABLE(pci, kvaser_pciefd_id_table);
/* Onboard flash memory functions */
static int kvaser_pciefd_spi_wait_loop(struct kvaser_pciefd *pcie, int msk)
{
u32 res;
int ret;
ret = readl_poll_timeout(pcie->reg_base + KVASER_PCIEFD_SPI_STATUS_REG,
res, res & msk, 0, 10);
return ret;
}
static int kvaser_pciefd_spi_cmd(struct kvaser_pciefd *pcie, const u8 *tx,
u32 tx_len, u8 *rx, u32 rx_len)
{
int c;
iowrite32(BIT(0), pcie->reg_base + KVASER_PCIEFD_SPI_SSEL_REG);
iowrite32(BIT(10), pcie->reg_base + KVASER_PCIEFD_SPI_CTRL_REG);
ioread32(pcie->reg_base + KVASER_PCIEFD_SPI_RX_REG);
c = tx_len;
while (c--) {
if (kvaser_pciefd_spi_wait_loop(pcie, KVASER_PCIEFD_SPI_TRDY))
return -EIO;
iowrite32(*tx++, pcie->reg_base + KVASER_PCIEFD_SPI_TX_REG);
if (kvaser_pciefd_spi_wait_loop(pcie, KVASER_PCIEFD_SPI_RRDY))
return -EIO;
ioread32(pcie->reg_base + KVASER_PCIEFD_SPI_RX_REG);
}
c = rx_len;
while (c-- > 0) {
if (kvaser_pciefd_spi_wait_loop(pcie, KVASER_PCIEFD_SPI_TRDY))
return -EIO;
iowrite32(0, pcie->reg_base + KVASER_PCIEFD_SPI_TX_REG);
if (kvaser_pciefd_spi_wait_loop(pcie, KVASER_PCIEFD_SPI_RRDY))
return -EIO;
*rx++ = ioread32(pcie->reg_base + KVASER_PCIEFD_SPI_RX_REG);
}
if (kvaser_pciefd_spi_wait_loop(pcie, KVASER_PCIEFD_SPI_TMT))
return -EIO;
iowrite32(0, pcie->reg_base + KVASER_PCIEFD_SPI_CTRL_REG);
if (c != -1) {
dev_err(&pcie->pci->dev, "Flash SPI transfer failed\n");
return -EIO;
}
return 0;
}
static int kvaser_pciefd_cfg_read_and_verify(struct kvaser_pciefd *pcie,
struct kvaser_pciefd_cfg_img *img)
{
int offset = KVASER_PCIEFD_CFG_IMG_OFFSET;
int res, crc;
u8 *crc_buff;
u8 cmd[] = {
KVASER_PCIEFD_FLASH_READ_CMD,
(u8)((offset >> 16) & 0xff),
(u8)((offset >> 8) & 0xff),
(u8)(offset & 0xff)
};
res = kvaser_pciefd_spi_cmd(pcie, cmd, ARRAY_SIZE(cmd), (u8 *)img,
KVASER_PCIEFD_CFG_IMG_SZ);
if (res)
return res;
crc_buff = (u8 *)img->params;
if (le32_to_cpu(img->version) != KVASER_PCIEFD_CFG_SYS_VER) {
dev_err(&pcie->pci->dev,
"Config flash corrupted, version number is wrong\n");
return -ENODEV;
}
if (le32_to_cpu(img->magic) != KVASER_PCIEFD_CFG_MAGIC) {
dev_err(&pcie->pci->dev,
"Config flash corrupted, magic number is wrong\n");
return -ENODEV;
}
crc = ~crc32_be(0xffffffff, crc_buff, sizeof(img->params));
if (le32_to_cpu(img->crc) != crc) {
dev_err(&pcie->pci->dev,
"Stored CRC does not match flash image contents\n");
return -EIO;
}
return 0;
}
static void kvaser_pciefd_cfg_read_params(struct kvaser_pciefd *pcie,
struct kvaser_pciefd_cfg_img *img)
{
struct kvaser_pciefd_cfg_param *param;
param = &img->params[KVASER_PCIEFD_CFG_PARAM_NR_CHAN];
memcpy(&pcie->nr_channels, param->data, le32_to_cpu(param->len));
}
static int kvaser_pciefd_read_cfg(struct kvaser_pciefd *pcie)
{
int res;
struct kvaser_pciefd_cfg_img *img;
/* Read electronic signature */
u8 cmd[] = {KVASER_PCIEFD_FLASH_RES_CMD, 0, 0, 0};
res = kvaser_pciefd_spi_cmd(pcie, cmd, ARRAY_SIZE(cmd), cmd, 1);
if (res)
return -EIO;
img = kmalloc(KVASER_PCIEFD_CFG_IMG_SZ, GFP_KERNEL);
if (!img)
return -ENOMEM;
if (cmd[0] != KVASER_PCIEFD_FLASH_ID_EPCS16) {
dev_err(&pcie->pci->dev,
"Flash id is 0x%x instead of expected EPCS16 (0x%x)\n",
cmd[0], KVASER_PCIEFD_FLASH_ID_EPCS16);
res = -ENODEV;
goto image_free;
}
cmd[0] = KVASER_PCIEFD_FLASH_STATUS_CMD;
res = kvaser_pciefd_spi_cmd(pcie, cmd, 1, cmd, 1);
if (res) {
goto image_free;
} else if (cmd[0] & 1) {
res = -EIO;
/* No write is ever done, the WIP should never be set */
dev_err(&pcie->pci->dev, "Unexpected WIP bit set in flash\n");
goto image_free;
}
res = kvaser_pciefd_cfg_read_and_verify(pcie, img);
if (res) {
res = -EIO;
goto image_free;
}
kvaser_pciefd_cfg_read_params(pcie, img);
image_free:
kfree(img);
return res;
}
static void kvaser_pciefd_request_status(struct kvaser_pciefd_can *can)
{
u32 cmd;
cmd = KVASER_PCIEFD_KCAN_CMD_SRQ;
cmd |= ++can->cmd_seq << KVASER_PCIEFD_KCAN_CMD_SEQ_SHIFT;
iowrite32(cmd, can->reg_base + KVASER_PCIEFD_KCAN_CMD_REG);
}
static void kvaser_pciefd_enable_err_gen(struct kvaser_pciefd_can *can)
{
u32 mode;
unsigned long irq;
spin_lock_irqsave(&can->lock, irq);
mode = ioread32(can->reg_base + KVASER_PCIEFD_KCAN_MODE_REG);
if (!(mode & KVASER_PCIEFD_KCAN_MODE_EPEN)) {
mode |= KVASER_PCIEFD_KCAN_MODE_EPEN;
iowrite32(mode, can->reg_base + KVASER_PCIEFD_KCAN_MODE_REG);
}
spin_unlock_irqrestore(&can->lock, irq);
}
static void kvaser_pciefd_disable_err_gen(struct kvaser_pciefd_can *can)
{
u32 mode;
unsigned long irq;
spin_lock_irqsave(&can->lock, irq);
mode = ioread32(can->reg_base + KVASER_PCIEFD_KCAN_MODE_REG);
mode &= ~KVASER_PCIEFD_KCAN_MODE_EPEN;
iowrite32(mode, can->reg_base + KVASER_PCIEFD_KCAN_MODE_REG);
spin_unlock_irqrestore(&can->lock, irq);
}
static int kvaser_pciefd_set_tx_irq(struct kvaser_pciefd_can *can)
{
u32 msk;
msk = KVASER_PCIEFD_KCAN_IRQ_TE | KVASER_PCIEFD_KCAN_IRQ_ROF |
KVASER_PCIEFD_KCAN_IRQ_TOF | KVASER_PCIEFD_KCAN_IRQ_ABD |
KVASER_PCIEFD_KCAN_IRQ_TAE | KVASER_PCIEFD_KCAN_IRQ_TAL |
KVASER_PCIEFD_KCAN_IRQ_FDIC | KVASER_PCIEFD_KCAN_IRQ_BPP |
KVASER_PCIEFD_KCAN_IRQ_TAR | KVASER_PCIEFD_KCAN_IRQ_TFD;
iowrite32(msk, can->reg_base + KVASER_PCIEFD_KCAN_IEN_REG);
return 0;
}
static void kvaser_pciefd_setup_controller(struct kvaser_pciefd_can *can)
{
u32 mode;
unsigned long irq;
spin_lock_irqsave(&can->lock, irq);
mode = ioread32(can->reg_base + KVASER_PCIEFD_KCAN_MODE_REG);
if (can->can.ctrlmode & CAN_CTRLMODE_FD) {
mode &= ~KVASER_PCIEFD_KCAN_MODE_CCM;
if (can->can.ctrlmode & CAN_CTRLMODE_FD_NON_ISO)
mode |= KVASER_PCIEFD_KCAN_MODE_NIFDEN;
else
mode &= ~KVASER_PCIEFD_KCAN_MODE_NIFDEN;
} else {
mode |= KVASER_PCIEFD_KCAN_MODE_CCM;
mode &= ~KVASER_PCIEFD_KCAN_MODE_NIFDEN;
}
if (can->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
mode |= KVASER_PCIEFD_KCAN_MODE_LOM;
mode |= KVASER_PCIEFD_KCAN_MODE_EEN;
mode |= KVASER_PCIEFD_KCAN_MODE_EPEN;
/* Use ACK packet type */
mode &= ~KVASER_PCIEFD_KCAN_MODE_APT;
mode &= ~KVASER_PCIEFD_KCAN_MODE_RM;
iowrite32(mode, can->reg_base + KVASER_PCIEFD_KCAN_MODE_REG);
spin_unlock_irqrestore(&can->lock, irq);
}
static void kvaser_pciefd_start_controller_flush(struct kvaser_pciefd_can *can)
{
u32 status;
unsigned long irq;
spin_lock_irqsave(&can->lock, irq);
iowrite32(-1, can->reg_base + KVASER_PCIEFD_KCAN_IRQ_REG);
iowrite32(KVASER_PCIEFD_KCAN_IRQ_ABD | KVASER_PCIEFD_KCAN_IRQ_TFD,
can->reg_base + KVASER_PCIEFD_KCAN_IEN_REG);
status = ioread32(can->reg_base + KVASER_PCIEFD_KCAN_STAT_REG);
if (status & KVASER_PCIEFD_KCAN_STAT_IDLE) {
u32 cmd;
/* If controller is already idle, run abort, flush and reset */
cmd = KVASER_PCIEFD_KCAN_CMD_AT;
cmd |= ++can->cmd_seq << KVASER_PCIEFD_KCAN_CMD_SEQ_SHIFT;
iowrite32(cmd, can->reg_base + KVASER_PCIEFD_KCAN_CMD_REG);
} else if (!(status & KVASER_PCIEFD_KCAN_STAT_RMR)) {
u32 mode;
/* Put controller in reset mode */
mode = ioread32(can->reg_base + KVASER_PCIEFD_KCAN_MODE_REG);
mode |= KVASER_PCIEFD_KCAN_MODE_RM;
iowrite32(mode, can->reg_base + KVASER_PCIEFD_KCAN_MODE_REG);
}
spin_unlock_irqrestore(&can->lock, irq);
}
static int kvaser_pciefd_bus_on(struct kvaser_pciefd_can *can)
{
u32 mode;
unsigned long irq;
del_timer(&can->bec_poll_timer);
if (!completion_done(&can->flush_comp))
kvaser_pciefd_start_controller_flush(can);
if (!wait_for_completion_timeout(&can->flush_comp,
KVASER_PCIEFD_WAIT_TIMEOUT)) {
netdev_err(can->can.dev, "Timeout during bus on flush\n");
return -ETIMEDOUT;
}
spin_lock_irqsave(&can->lock, irq);
iowrite32(0, can->reg_base + KVASER_PCIEFD_KCAN_IEN_REG);
iowrite32(-1, can->reg_base + KVASER_PCIEFD_KCAN_IRQ_REG);
iowrite32(KVASER_PCIEFD_KCAN_IRQ_ABD | KVASER_PCIEFD_KCAN_IRQ_TFD,
can->reg_base + KVASER_PCIEFD_KCAN_IEN_REG);
mode = ioread32(can->reg_base + KVASER_PCIEFD_KCAN_MODE_REG);
mode &= ~KVASER_PCIEFD_KCAN_MODE_RM;
iowrite32(mode, can->reg_base + KVASER_PCIEFD_KCAN_MODE_REG);
spin_unlock_irqrestore(&can->lock, irq);
if (!wait_for_completion_timeout(&can->start_comp,
KVASER_PCIEFD_WAIT_TIMEOUT)) {
netdev_err(can->can.dev, "Timeout during bus on reset\n");
return -ETIMEDOUT;
}
/* Reset interrupt handling */
iowrite32(0, can->reg_base + KVASER_PCIEFD_KCAN_IEN_REG);
iowrite32(-1, can->reg_base + KVASER_PCIEFD_KCAN_IRQ_REG);
kvaser_pciefd_set_tx_irq(can);
kvaser_pciefd_setup_controller(can);
can->can.state = CAN_STATE_ERROR_ACTIVE;
netif_wake_queue(can->can.dev);
can->bec.txerr = 0;
can->bec.rxerr = 0;
can->err_rep_cnt = 0;
return 0;
}
static void kvaser_pciefd_pwm_stop(struct kvaser_pciefd_can *can)
{
u8 top;
u32 pwm_ctrl;
unsigned long irq;
spin_lock_irqsave(&can->lock, irq);
pwm_ctrl = ioread32(can->reg_base + KVASER_PCIEFD_KCAN_PWM_REG);
top = (pwm_ctrl >> KVASER_PCIEFD_KCAN_PWM_TOP_SHIFT) & 0xff;
/* Set duty cycle to zero */
pwm_ctrl |= top;
iowrite32(pwm_ctrl, can->reg_base + KVASER_PCIEFD_KCAN_PWM_REG);
spin_unlock_irqrestore(&can->lock, irq);
}
static void kvaser_pciefd_pwm_start(struct kvaser_pciefd_can *can)
{
int top, trigger;
u32 pwm_ctrl;
unsigned long irq;
kvaser_pciefd_pwm_stop(can);
spin_lock_irqsave(&can->lock, irq);
/* Set frequency to 500 KHz*/
top = can->kv_pcie->bus_freq / (2 * 500000) - 1;
pwm_ctrl = top & 0xff;
pwm_ctrl |= (top & 0xff) << KVASER_PCIEFD_KCAN_PWM_TOP_SHIFT;
iowrite32(pwm_ctrl, can->reg_base + KVASER_PCIEFD_KCAN_PWM_REG);
/* Set duty cycle to 95 */
trigger = (100 * top - 95 * (top + 1) + 50) / 100;
pwm_ctrl = trigger & 0xff;
pwm_ctrl |= (top & 0xff) << KVASER_PCIEFD_KCAN_PWM_TOP_SHIFT;
iowrite32(pwm_ctrl, can->reg_base + KVASER_PCIEFD_KCAN_PWM_REG);
spin_unlock_irqrestore(&can->lock, irq);
}
static int kvaser_pciefd_open(struct net_device *netdev)
{
int err;
struct kvaser_pciefd_can *can = netdev_priv(netdev);
err = open_candev(netdev);
if (err)
return err;
err = kvaser_pciefd_bus_on(can);
if (err)
return err;
return 0;
}
static int kvaser_pciefd_stop(struct net_device *netdev)
{
struct kvaser_pciefd_can *can = netdev_priv(netdev);
int ret = 0;
/* Don't interrupt ongoing flush */
if (!completion_done(&can->flush_comp))
kvaser_pciefd_start_controller_flush(can);
if (!wait_for_completion_timeout(&can->flush_comp,
KVASER_PCIEFD_WAIT_TIMEOUT)) {
netdev_err(can->can.dev, "Timeout during stop\n");
ret = -ETIMEDOUT;
} else {
iowrite32(0, can->reg_base + KVASER_PCIEFD_KCAN_IEN_REG);
del_timer(&can->bec_poll_timer);
}
close_candev(netdev);
return ret;
}
static int kvaser_pciefd_prepare_tx_packet(struct kvaser_pciefd_tx_packet *p,
struct kvaser_pciefd_can *can,
struct sk_buff *skb)
{
struct canfd_frame *cf = (struct canfd_frame *)skb->data;
int packet_size;
int seq = can->echo_idx;
memset(p, 0, sizeof(*p));
if (can->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT)
p->header[1] |= KVASER_PCIEFD_TPACKET_SMS;
if (cf->can_id & CAN_RTR_FLAG)
p->header[0] |= KVASER_PCIEFD_RPACKET_RTR;
if (cf->can_id & CAN_EFF_FLAG)
p->header[0] |= KVASER_PCIEFD_RPACKET_IDE;
p->header[0] |= cf->can_id & CAN_EFF_MASK;
p->header[1] |= can_len2dlc(cf->len) << KVASER_PCIEFD_RPACKET_DLC_SHIFT;
p->header[1] |= KVASER_PCIEFD_TPACKET_AREQ;
if (can_is_canfd_skb(skb)) {
p->header[1] |= KVASER_PCIEFD_RPACKET_FDF;
if (cf->flags & CANFD_BRS)
p->header[1] |= KVASER_PCIEFD_RPACKET_BRS;
if (cf->flags & CANFD_ESI)
p->header[1] |= KVASER_PCIEFD_RPACKET_ESI;
}
p->header[1] |= seq & KVASER_PCIEFD_PACKET_SEQ_MSK;
packet_size = cf->len;
memcpy(p->data, cf->data, packet_size);
return DIV_ROUND_UP(packet_size, 4);
}
static netdev_tx_t kvaser_pciefd_start_xmit(struct sk_buff *skb,
struct net_device *netdev)
{
struct kvaser_pciefd_can *can = netdev_priv(netdev);
unsigned long irq_flags;
struct kvaser_pciefd_tx_packet packet;
int nwords;
u8 count;
if (can_dropped_invalid_skb(netdev, skb))
return NETDEV_TX_OK;
nwords = kvaser_pciefd_prepare_tx_packet(&packet, can, skb);
spin_lock_irqsave(&can->echo_lock, irq_flags);
/* Prepare and save echo skb in internal slot */
can_put_echo_skb(skb, netdev, can->echo_idx);
/* Move echo index to the next slot */
can->echo_idx = (can->echo_idx + 1) % can->can.echo_skb_max;
/* Write header to fifo */
iowrite32(packet.header[0],
can->reg_base + KVASER_PCIEFD_KCAN_FIFO_REG);
iowrite32(packet.header[1],
can->reg_base + KVASER_PCIEFD_KCAN_FIFO_REG);
if (nwords) {
u32 data_last = ((u32 *)packet.data)[nwords - 1];
/* Write data to fifo, except last word */
iowrite32_rep(can->reg_base +
KVASER_PCIEFD_KCAN_FIFO_REG, packet.data,
nwords - 1);
/* Write last word to end of fifo */
__raw_writel(data_last, can->reg_base +
KVASER_PCIEFD_KCAN_FIFO_LAST_REG);
} else {
/* Complete write to fifo */
__raw_writel(0, can->reg_base +
KVASER_PCIEFD_KCAN_FIFO_LAST_REG);
}
count = ioread32(can->reg_base + KVASER_PCIEFD_KCAN_TX_NPACKETS_REG);
/* No room for a new message, stop the queue until at least one
* successful transmit
*/
if (count >= KVASER_PCIEFD_CAN_TX_MAX_COUNT ||
can->can.echo_skb[can->echo_idx])
netif_stop_queue(netdev);
spin_unlock_irqrestore(&can->echo_lock, irq_flags);
return NETDEV_TX_OK;
}
static int kvaser_pciefd_set_bittiming(struct kvaser_pciefd_can *can, bool data)
{
u32 mode, test, btrn;
unsigned long irq_flags;
int ret;
struct can_bittiming *bt;
if (data)
bt = &can->can.data_bittiming;
else
bt = &can->can.bittiming;
btrn = ((bt->phase_seg2 - 1) & 0x1f) <<
KVASER_PCIEFD_KCAN_BTRN_TSEG2_SHIFT |
(((bt->prop_seg + bt->phase_seg1) - 1) & 0x1ff) <<
KVASER_PCIEFD_KCAN_BTRN_TSEG1_SHIFT |
((bt->sjw - 1) & 0xf) << KVASER_PCIEFD_KCAN_BTRN_SJW_SHIFT |
((bt->brp - 1) & 0x1fff);
spin_lock_irqsave(&can->lock, irq_flags);
mode = ioread32(can->reg_base + KVASER_PCIEFD_KCAN_MODE_REG);
/* Put the circuit in reset mode */
iowrite32(mode | KVASER_PCIEFD_KCAN_MODE_RM,
can->reg_base + KVASER_PCIEFD_KCAN_MODE_REG);
/* Can only set bittiming if in reset mode */
ret = readl_poll_timeout(can->reg_base + KVASER_PCIEFD_KCAN_MODE_REG,
test, test & KVASER_PCIEFD_KCAN_MODE_RM,
0, 10);
if (ret) {
spin_unlock_irqrestore(&can->lock, irq_flags);
return -EBUSY;
}
if (data)
iowrite32(btrn, can->reg_base + KVASER_PCIEFD_KCAN_BTRD_REG);
else
iowrite32(btrn, can->reg_base + KVASER_PCIEFD_KCAN_BTRN_REG);
/* Restore previous reset mode status */
iowrite32(mode, can->reg_base + KVASER_PCIEFD_KCAN_MODE_REG);
spin_unlock_irqrestore(&can->lock, irq_flags);
return 0;
}
static int kvaser_pciefd_set_nominal_bittiming(struct net_device *ndev)
{
return kvaser_pciefd_set_bittiming(netdev_priv(ndev), false);
}
static int kvaser_pciefd_set_data_bittiming(struct net_device *ndev)
{
return kvaser_pciefd_set_bittiming(netdev_priv(ndev), true);
}
static int kvaser_pciefd_set_mode(struct net_device *ndev, enum can_mode mode)
{
struct kvaser_pciefd_can *can = netdev_priv(ndev);
int ret = 0;
switch (mode) {
case CAN_MODE_START:
if (!can->can.restart_ms)
ret = kvaser_pciefd_bus_on(can);
break;
default:
return -EOPNOTSUPP;
}
return ret;
}
static int kvaser_pciefd_get_berr_counter(const struct net_device *ndev,
struct can_berr_counter *bec)
{
struct kvaser_pciefd_can *can = netdev_priv(ndev);
bec->rxerr = can->bec.rxerr;
bec->txerr = can->bec.txerr;
return 0;
}
static void kvaser_pciefd_bec_poll_timer(struct timer_list *data)
{
struct kvaser_pciefd_can *can = from_timer(can, data, bec_poll_timer);
kvaser_pciefd_enable_err_gen(can);
kvaser_pciefd_request_status(can);
can->err_rep_cnt = 0;
}
static const struct net_device_ops kvaser_pciefd_netdev_ops = {
.ndo_open = kvaser_pciefd_open,
.ndo_stop = kvaser_pciefd_stop,
.ndo_start_xmit = kvaser_pciefd_start_xmit,
.ndo_change_mtu = can_change_mtu,
};
static int kvaser_pciefd_setup_can_ctrls(struct kvaser_pciefd *pcie)
{
int i;
for (i = 0; i < pcie->nr_channels; i++) {
struct net_device *netdev;
struct kvaser_pciefd_can *can;
u32 status, tx_npackets;
netdev = alloc_candev(sizeof(struct kvaser_pciefd_can),
KVASER_PCIEFD_CAN_TX_MAX_COUNT);
if (!netdev)
return -ENOMEM;
can = netdev_priv(netdev);
netdev->netdev_ops = &kvaser_pciefd_netdev_ops;
can->reg_base = pcie->reg_base + KVASER_PCIEFD_KCAN0_BASE +
i * KVASER_PCIEFD_KCAN_BASE_OFFSET;
can->kv_pcie = pcie;
can->cmd_seq = 0;
can->err_rep_cnt = 0;
can->bec.txerr = 0;
can->bec.rxerr = 0;
init_completion(&can->start_comp);
init_completion(&can->flush_comp);
timer_setup(&can->bec_poll_timer, kvaser_pciefd_bec_poll_timer,
0);
tx_npackets = ioread32(can->reg_base +
KVASER_PCIEFD_KCAN_TX_NPACKETS_REG);
if (((tx_npackets >> KVASER_PCIEFD_KCAN_TX_NPACKETS_MAX_SHIFT) &
0xff) < KVASER_PCIEFD_CAN_TX_MAX_COUNT) {
dev_err(&pcie->pci->dev,
"Max Tx count is smaller than expected\n");
free_candev(netdev);
return -ENODEV;
}
can->can.clock.freq = pcie->freq;
can->can.echo_skb_max = KVASER_PCIEFD_CAN_TX_MAX_COUNT;
can->echo_idx = 0;
spin_lock_init(&can->echo_lock);
spin_lock_init(&can->lock);
can->can.bittiming_const = &kvaser_pciefd_bittiming_const;
can->can.data_bittiming_const = &kvaser_pciefd_bittiming_const;
can->can.do_set_bittiming = kvaser_pciefd_set_nominal_bittiming;
can->can.do_set_data_bittiming =
kvaser_pciefd_set_data_bittiming;
can->can.do_set_mode = kvaser_pciefd_set_mode;
can->can.do_get_berr_counter = kvaser_pciefd_get_berr_counter;
can->can.ctrlmode_supported = CAN_CTRLMODE_LISTENONLY |
CAN_CTRLMODE_FD |
CAN_CTRLMODE_FD_NON_ISO;
status = ioread32(can->reg_base + KVASER_PCIEFD_KCAN_STAT_REG);
if (!(status & KVASER_PCIEFD_KCAN_STAT_FD)) {
dev_err(&pcie->pci->dev,
"CAN FD not supported as expected %d\n", i);
free_candev(netdev);
return -ENODEV;
}
if (status & KVASER_PCIEFD_KCAN_STAT_CAP)
can->can.ctrlmode_supported |= CAN_CTRLMODE_ONE_SHOT;
netdev->flags |= IFF_ECHO;
SET_NETDEV_DEV(netdev, &pcie->pci->dev);
iowrite32(-1, can->reg_base + KVASER_PCIEFD_KCAN_IRQ_REG);
iowrite32(KVASER_PCIEFD_KCAN_IRQ_ABD |
KVASER_PCIEFD_KCAN_IRQ_TFD,
can->reg_base + KVASER_PCIEFD_KCAN_IEN_REG);
pcie->can[i] = can;
kvaser_pciefd_pwm_start(can);
}
return 0;
}
static int kvaser_pciefd_reg_candev(struct kvaser_pciefd *pcie)
{
int i;
for (i = 0; i < pcie->nr_channels; i++) {
int err = register_candev(pcie->can[i]->can.dev);
if (err) {
int j;
/* Unregister all successfully registered devices. */
for (j = 0; j < i; j++)
unregister_candev(pcie->can[j]->can.dev);
return err;
}
}
return 0;
}
static void kvaser_pciefd_write_dma_map(struct kvaser_pciefd *pcie,
dma_addr_t addr, int offset)
{
u32 word1, word2;
#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
word1 = addr | KVASER_PCIEFD_64BIT_DMA_BIT;
word2 = addr >> 32;
#else
word1 = addr;
word2 = 0;
#endif
iowrite32(word1, pcie->reg_base + offset);
iowrite32(word2, pcie->reg_base + offset + 4);
}
static int kvaser_pciefd_setup_dma(struct kvaser_pciefd *pcie)
{
int i;
u32 srb_status;
dma_addr_t dma_addr[KVASER_PCIEFD_DMA_COUNT];
/* Disable the DMA */
iowrite32(0, pcie->reg_base + KVASER_PCIEFD_SRB_CTRL_REG);
for (i = 0; i < KVASER_PCIEFD_DMA_COUNT; i++) {
unsigned int offset = KVASER_PCIEFD_DMA_MAP_BASE + 8 * i;
pcie->dma_data[i] =
dmam_alloc_coherent(&pcie->pci->dev,
KVASER_PCIEFD_DMA_SIZE,
&dma_addr[i],
GFP_KERNEL);
if (!pcie->dma_data[i] || !dma_addr[i]) {
dev_err(&pcie->pci->dev, "Rx dma_alloc(%u) failure\n",
KVASER_PCIEFD_DMA_SIZE);
return -ENOMEM;
}
kvaser_pciefd_write_dma_map(pcie, dma_addr[i], offset);
}
/* Reset Rx FIFO, and both DMA buffers */
iowrite32(KVASER_PCIEFD_SRB_CMD_FOR | KVASER_PCIEFD_SRB_CMD_RDB0 |
KVASER_PCIEFD_SRB_CMD_RDB1,
pcie->reg_base + KVASER_PCIEFD_SRB_CMD_REG);
srb_status = ioread32(pcie->reg_base + KVASER_PCIEFD_SRB_STAT_REG);
if (!(srb_status & KVASER_PCIEFD_SRB_STAT_DI)) {
dev_err(&pcie->pci->dev, "DMA not idle before enabling\n");
return -EIO;
}
/* Enable the DMA */
iowrite32(KVASER_PCIEFD_SRB_CTRL_DMA_ENABLE,
pcie->reg_base + KVASER_PCIEFD_SRB_CTRL_REG);
return 0;
}
static int kvaser_pciefd_setup_board(struct kvaser_pciefd *pcie)
{
u32 sysid, srb_status, build;
u8 sysid_nr_chan;
int ret;
ret = kvaser_pciefd_read_cfg(pcie);
if (ret)
return ret;
sysid = ioread32(pcie->reg_base + KVASER_PCIEFD_SYSID_VERSION_REG);
sysid_nr_chan = (sysid >> KVASER_PCIEFD_SYSID_NRCHAN_SHIFT) & 0xff;
if (pcie->nr_channels != sysid_nr_chan) {
dev_err(&pcie->pci->dev,
"Number of channels does not match: %u vs %u\n",
pcie->nr_channels,
sysid_nr_chan);
return -ENODEV;
}
if (pcie->nr_channels > KVASER_PCIEFD_MAX_CAN_CHANNELS)
pcie->nr_channels = KVASER_PCIEFD_MAX_CAN_CHANNELS;
build = ioread32(pcie->reg_base + KVASER_PCIEFD_SYSID_BUILD_REG);
dev_dbg(&pcie->pci->dev, "Version %u.%u.%u\n",
(sysid >> KVASER_PCIEFD_SYSID_MAJOR_VER_SHIFT) & 0xff,
sysid & 0xff,
(build >> KVASER_PCIEFD_SYSID_BUILD_VER_SHIFT) & 0x7fff);
srb_status = ioread32(pcie->reg_base + KVASER_PCIEFD_SRB_STAT_REG);
if (!(srb_status & KVASER_PCIEFD_SRB_STAT_DMA)) {
dev_err(&pcie->pci->dev,
"Hardware without DMA is not supported\n");
return -ENODEV;
}
pcie->bus_freq = ioread32(pcie->reg_base +
KVASER_PCIEFD_SYSID_BUSFREQ_REG);
pcie->freq = ioread32(pcie->reg_base + KVASER_PCIEFD_SYSID_CANFREQ_REG);
pcie->freq_to_ticks_div = pcie->freq / 1000000;
if (pcie->freq_to_ticks_div == 0)
pcie->freq_to_ticks_div = 1;
/* Turn off all loopback functionality */
iowrite32(0, pcie->reg_base + KVASER_PCIEFD_LOOP_REG);
return ret;
}
static int kvaser_pciefd_handle_data_packet(struct kvaser_pciefd *pcie,
struct kvaser_pciefd_rx_packet *p,
__le32 *data)
{
struct sk_buff *skb;
struct canfd_frame *cf;
struct can_priv *priv;
struct net_device_stats *stats;
struct skb_shared_hwtstamps *shhwtstamps;
u8 ch_id = (p->header[1] >> KVASER_PCIEFD_PACKET_CHID_SHIFT) & 0x7;
if (ch_id >= pcie->nr_channels)
return -EIO;
priv = &pcie->can[ch_id]->can;
stats = &priv->dev->stats;
if (p->header[1] & KVASER_PCIEFD_RPACKET_FDF) {
skb = alloc_canfd_skb(priv->dev, &cf);
if (!skb) {
stats->rx_dropped++;
return -ENOMEM;
}
if (p->header[1] & KVASER_PCIEFD_RPACKET_BRS)
cf->flags |= CANFD_BRS;
if (p->header[1] & KVASER_PCIEFD_RPACKET_ESI)
cf->flags |= CANFD_ESI;
} else {
skb = alloc_can_skb(priv->dev, (struct can_frame **)&cf);
if (!skb) {
stats->rx_dropped++;
return -ENOMEM;
}
}
cf->can_id = p->header[0] & CAN_EFF_MASK;
if (p->header[0] & KVASER_PCIEFD_RPACKET_IDE)
cf->can_id |= CAN_EFF_FLAG;
cf->len = can_dlc2len(p->header[1] >> KVASER_PCIEFD_RPACKET_DLC_SHIFT);
if (p->header[0] & KVASER_PCIEFD_RPACKET_RTR)
cf->can_id |= CAN_RTR_FLAG;
else
memcpy(cf->data, data, cf->len);
shhwtstamps = skb_hwtstamps(skb);
shhwtstamps->hwtstamp =
ns_to_ktime(div_u64(p->timestamp * 1000,
pcie->freq_to_ticks_div));
stats->rx_bytes += cf->len;
stats->rx_packets++;
return netif_rx(skb);
}
static void kvaser_pciefd_change_state(struct kvaser_pciefd_can *can,
struct can_frame *cf,
enum can_state new_state,
enum can_state tx_state,
enum can_state rx_state)
{
can_change_state(can->can.dev, cf, tx_state, rx_state);
if (new_state == CAN_STATE_BUS_OFF) {
struct net_device *ndev = can->can.dev;
unsigned long irq_flags;
spin_lock_irqsave(&can->lock, irq_flags);
netif_stop_queue(can->can.dev);
spin_unlock_irqrestore(&can->lock, irq_flags);
/* Prevent CAN controller from auto recover from bus off */
if (!can->can.restart_ms) {
kvaser_pciefd_start_controller_flush(can);
can_bus_off(ndev);
}
}
}
static void kvaser_pciefd_packet_to_state(struct kvaser_pciefd_rx_packet *p,
struct can_berr_counter *bec,
enum can_state *new_state,
enum can_state *tx_state,
enum can_state *rx_state)
{
if (p->header[0] & KVASER_PCIEFD_SPACK_BOFF ||
p->header[0] & KVASER_PCIEFD_SPACK_IRM)
*new_state = CAN_STATE_BUS_OFF;
else if (bec->txerr >= 255 || bec->rxerr >= 255)
*new_state = CAN_STATE_BUS_OFF;
else if (p->header[1] & KVASER_PCIEFD_SPACK_EPLR)
*new_state = CAN_STATE_ERROR_PASSIVE;
else if (bec->txerr >= 128 || bec->rxerr >= 128)
*new_state = CAN_STATE_ERROR_PASSIVE;
else if (p->header[1] & KVASER_PCIEFD_SPACK_EWLR)
*new_state = CAN_STATE_ERROR_WARNING;
else if (bec->txerr >= 96 || bec->rxerr >= 96)
*new_state = CAN_STATE_ERROR_WARNING;
else
*new_state = CAN_STATE_ERROR_ACTIVE;
*tx_state = bec->txerr >= bec->rxerr ? *new_state : 0;
*rx_state = bec->txerr <= bec->rxerr ? *new_state : 0;
}
static int kvaser_pciefd_rx_error_frame(struct kvaser_pciefd_can *can,
struct kvaser_pciefd_rx_packet *p)
{
struct can_berr_counter bec;
enum can_state old_state, new_state, tx_state, rx_state;
struct net_device *ndev = can->can.dev;
struct sk_buff *skb;
struct can_frame *cf = NULL;
struct skb_shared_hwtstamps *shhwtstamps;
struct net_device_stats *stats = &ndev->stats;
old_state = can->can.state;
bec.txerr = p->header[0] & 0xff;
bec.rxerr = (p->header[0] >> KVASER_PCIEFD_SPACK_RXERR_SHIFT) & 0xff;
kvaser_pciefd_packet_to_state(p, &bec, &new_state, &tx_state,
&rx_state);
skb = alloc_can_err_skb(ndev, &cf);
if (new_state != old_state) {
kvaser_pciefd_change_state(can, cf, new_state, tx_state,
rx_state);
if (old_state == CAN_STATE_BUS_OFF &&
new_state == CAN_STATE_ERROR_ACTIVE &&
can->can.restart_ms) {
can->can.can_stats.restarts++;
if (skb)
cf->can_id |= CAN_ERR_RESTARTED;
}
}
can->err_rep_cnt++;
can->can.can_stats.bus_error++;
stats->rx_errors++;
can->bec.txerr = bec.txerr;
can->bec.rxerr = bec.rxerr;
if (!skb) {
stats->rx_dropped++;
return -ENOMEM;
}
shhwtstamps = skb_hwtstamps(skb);
shhwtstamps->hwtstamp =
ns_to_ktime(div_u64(p->timestamp * 1000,
can->kv_pcie->freq_to_ticks_div));
cf->can_id |= CAN_ERR_BUSERROR;
cf->data[6] = bec.txerr;
cf->data[7] = bec.rxerr;
stats->rx_packets++;
stats->rx_bytes += cf->can_dlc;
netif_rx(skb);
return 0;
}
static int kvaser_pciefd_handle_error_packet(struct kvaser_pciefd *pcie,
struct kvaser_pciefd_rx_packet *p)
{
struct kvaser_pciefd_can *can;
u8 ch_id = (p->header[1] >> KVASER_PCIEFD_PACKET_CHID_SHIFT) & 0x7;
if (ch_id >= pcie->nr_channels)
return -EIO;
can = pcie->can[ch_id];
kvaser_pciefd_rx_error_frame(can, p);
if (can->err_rep_cnt >= KVASER_PCIEFD_MAX_ERR_REP)
/* Do not report more errors, until bec_poll_timer expires */
kvaser_pciefd_disable_err_gen(can);
/* Start polling the error counters */
mod_timer(&can->bec_poll_timer, KVASER_PCIEFD_BEC_POLL_FREQ);
return 0;
}
static int kvaser_pciefd_handle_status_resp(struct kvaser_pciefd_can *can,
struct kvaser_pciefd_rx_packet *p)
{
struct can_berr_counter bec;
enum can_state old_state, new_state, tx_state, rx_state;
old_state = can->can.state;
bec.txerr = p->header[0] & 0xff;
bec.rxerr = (p->header[0] >> KVASER_PCIEFD_SPACK_RXERR_SHIFT) & 0xff;
kvaser_pciefd_packet_to_state(p, &bec, &new_state, &tx_state,
&rx_state);
if (new_state != old_state) {
struct net_device *ndev = can->can.dev;
struct sk_buff *skb;
struct can_frame *cf;
struct skb_shared_hwtstamps *shhwtstamps;
skb = alloc_can_err_skb(ndev, &cf);
if (!skb) {
struct net_device_stats *stats = &ndev->stats;
stats->rx_dropped++;
return -ENOMEM;
}
kvaser_pciefd_change_state(can, cf, new_state, tx_state,
rx_state);
if (old_state == CAN_STATE_BUS_OFF &&
new_state == CAN_STATE_ERROR_ACTIVE &&
can->can.restart_ms) {
can->can.can_stats.restarts++;
cf->can_id |= CAN_ERR_RESTARTED;
}
shhwtstamps = skb_hwtstamps(skb);
shhwtstamps->hwtstamp =
ns_to_ktime(div_u64(p->timestamp * 1000,
can->kv_pcie->freq_to_ticks_div));
cf->data[6] = bec.txerr;
cf->data[7] = bec.rxerr;
netif_rx(skb);
}
can->bec.txerr = bec.txerr;
can->bec.rxerr = bec.rxerr;
/* Check if we need to poll the error counters */
if (bec.txerr || bec.rxerr)
mod_timer(&can->bec_poll_timer, KVASER_PCIEFD_BEC_POLL_FREQ);
return 0;
}
static int kvaser_pciefd_handle_status_packet(struct kvaser_pciefd *pcie,
struct kvaser_pciefd_rx_packet *p)
{
struct kvaser_pciefd_can *can;
u8 cmdseq;
u32 status;
u8 ch_id = (p->header[1] >> KVASER_PCIEFD_PACKET_CHID_SHIFT) & 0x7;
if (ch_id >= pcie->nr_channels)
return -EIO;
can = pcie->can[ch_id];
status = ioread32(can->reg_base + KVASER_PCIEFD_KCAN_STAT_REG);
cmdseq = (status >> KVASER_PCIEFD_KCAN_STAT_SEQNO_SHIFT) & 0xff;
/* Reset done, start abort and flush */
if (p->header[0] & KVASER_PCIEFD_SPACK_IRM &&
p->header[0] & KVASER_PCIEFD_SPACK_RMCD &&
p->header[1] & KVASER_PCIEFD_SPACK_AUTO &&
cmdseq == (p->header[1] & KVASER_PCIEFD_PACKET_SEQ_MSK) &&
status & KVASER_PCIEFD_KCAN_STAT_IDLE) {
u32 cmd;
iowrite32(KVASER_PCIEFD_KCAN_IRQ_ABD,
can->reg_base + KVASER_PCIEFD_KCAN_IRQ_REG);
cmd = KVASER_PCIEFD_KCAN_CMD_AT;
cmd |= ++can->cmd_seq << KVASER_PCIEFD_KCAN_CMD_SEQ_SHIFT;
iowrite32(cmd, can->reg_base + KVASER_PCIEFD_KCAN_CMD_REG);
iowrite32(KVASER_PCIEFD_KCAN_IRQ_TFD,
can->reg_base + KVASER_PCIEFD_KCAN_IEN_REG);
} else if (p->header[0] & KVASER_PCIEFD_SPACK_IDET &&
p->header[0] & KVASER_PCIEFD_SPACK_IRM &&
cmdseq == (p->header[1] & KVASER_PCIEFD_PACKET_SEQ_MSK) &&
status & KVASER_PCIEFD_KCAN_STAT_IDLE) {
/* Reset detected, send end of flush if no packet are in FIFO */
u8 count = ioread32(can->reg_base +
KVASER_PCIEFD_KCAN_TX_NPACKETS_REG) & 0xff;
if (!count)
iowrite32(KVASER_PCIEFD_KCAN_CTRL_EFLUSH,
can->reg_base + KVASER_PCIEFD_KCAN_CTRL_REG);
} else if (!(p->header[1] & KVASER_PCIEFD_SPACK_AUTO) &&
cmdseq == (p->header[1] & KVASER_PCIEFD_PACKET_SEQ_MSK)) {
/* Response to status request received */
kvaser_pciefd_handle_status_resp(can, p);
if (can->can.state != CAN_STATE_BUS_OFF &&
can->can.state != CAN_STATE_ERROR_ACTIVE) {
mod_timer(&can->bec_poll_timer,
KVASER_PCIEFD_BEC_POLL_FREQ);
}
} else if (p->header[0] & KVASER_PCIEFD_SPACK_RMCD &&
!(status & KVASER_PCIEFD_KCAN_STAT_BUS_OFF_MSK)) {
/* Reset to bus on detected */
if (!completion_done(&can->start_comp))
complete(&can->start_comp);
}
return 0;
}
static int kvaser_pciefd_handle_eack_packet(struct kvaser_pciefd *pcie,
struct kvaser_pciefd_rx_packet *p)
{
struct kvaser_pciefd_can *can;
u8 ch_id = (p->header[1] >> KVASER_PCIEFD_PACKET_CHID_SHIFT) & 0x7;
if (ch_id >= pcie->nr_channels)
return -EIO;
can = pcie->can[ch_id];
/* If this is the last flushed packet, send end of flush */
if (p->header[0] & KVASER_PCIEFD_APACKET_FLU) {
u8 count = ioread32(can->reg_base +
KVASER_PCIEFD_KCAN_TX_NPACKETS_REG) & 0xff;
if (count == 0)
iowrite32(KVASER_PCIEFD_KCAN_CTRL_EFLUSH,
can->reg_base + KVASER_PCIEFD_KCAN_CTRL_REG);
} else {
int echo_idx = p->header[0] & KVASER_PCIEFD_PACKET_SEQ_MSK;
int dlc = can_get_echo_skb(can->can.dev, echo_idx);
struct net_device_stats *stats = &can->can.dev->stats;
stats->tx_bytes += dlc;
stats->tx_packets++;
if (netif_queue_stopped(can->can.dev))
netif_wake_queue(can->can.dev);
}
return 0;
}
static void kvaser_pciefd_handle_nack_packet(struct kvaser_pciefd_can *can,
struct kvaser_pciefd_rx_packet *p)
{
struct sk_buff *skb;
struct net_device_stats *stats = &can->can.dev->stats;
struct can_frame *cf;
skb = alloc_can_err_skb(can->can.dev, &cf);
stats->tx_errors++;
if (p->header[0] & KVASER_PCIEFD_APACKET_ABL) {
if (skb)
cf->can_id |= CAN_ERR_LOSTARB;
can->can.can_stats.arbitration_lost++;
} else if (skb) {
cf->can_id |= CAN_ERR_ACK;
}
if (skb) {
cf->can_id |= CAN_ERR_BUSERROR;
stats->rx_bytes += cf->can_dlc;
stats->rx_packets++;
netif_rx(skb);
} else {
stats->rx_dropped++;
netdev_warn(can->can.dev, "No memory left for err_skb\n");
}
}
static int kvaser_pciefd_handle_ack_packet(struct kvaser_pciefd *pcie,
struct kvaser_pciefd_rx_packet *p)
{
struct kvaser_pciefd_can *can;
bool one_shot_fail = false;
u8 ch_id = (p->header[1] >> KVASER_PCIEFD_PACKET_CHID_SHIFT) & 0x7;
if (ch_id >= pcie->nr_channels)
return -EIO;
can = pcie->can[ch_id];
/* Ignore control packet ACK */
if (p->header[0] & KVASER_PCIEFD_APACKET_CT)
return 0;
if (p->header[0] & KVASER_PCIEFD_APACKET_NACK) {
kvaser_pciefd_handle_nack_packet(can, p);
one_shot_fail = true;
}
if (p->header[0] & KVASER_PCIEFD_APACKET_FLU) {
netdev_dbg(can->can.dev, "Packet was flushed\n");
} else {
int echo_idx = p->header[0] & KVASER_PCIEFD_PACKET_SEQ_MSK;
int dlc = can_get_echo_skb(can->can.dev, echo_idx);
u8 count = ioread32(can->reg_base +
KVASER_PCIEFD_KCAN_TX_NPACKETS_REG) & 0xff;
if (count < KVASER_PCIEFD_CAN_TX_MAX_COUNT &&
netif_queue_stopped(can->can.dev))
netif_wake_queue(can->can.dev);
if (!one_shot_fail) {
struct net_device_stats *stats = &can->can.dev->stats;
stats->tx_bytes += dlc;
stats->tx_packets++;
}
}
return 0;
}
static int kvaser_pciefd_handle_eflush_packet(struct kvaser_pciefd *pcie,
struct kvaser_pciefd_rx_packet *p)
{
struct kvaser_pciefd_can *can;
u8 ch_id = (p->header[1] >> KVASER_PCIEFD_PACKET_CHID_SHIFT) & 0x7;
if (ch_id >= pcie->nr_channels)
return -EIO;
can = pcie->can[ch_id];
if (!completion_done(&can->flush_comp))
complete(&can->flush_comp);
return 0;
}
static int kvaser_pciefd_read_packet(struct kvaser_pciefd *pcie, int *start_pos,
int dma_buf)
{
__le32 *buffer = pcie->dma_data[dma_buf];
__le64 timestamp;
struct kvaser_pciefd_rx_packet packet;
struct kvaser_pciefd_rx_packet *p = &packet;
u8 type;
int pos = *start_pos;
int size;
int ret = 0;
size = le32_to_cpu(buffer[pos++]);
if (!size) {
*start_pos = 0;
return 0;
}
p->header[0] = le32_to_cpu(buffer[pos++]);
p->header[1] = le32_to_cpu(buffer[pos++]);
/* Read 64-bit timestamp */
memcpy(&timestamp, &buffer[pos], sizeof(__le64));
pos += 2;
p->timestamp = le64_to_cpu(timestamp);
type = (p->header[1] >> KVASER_PCIEFD_PACKET_TYPE_SHIFT) & 0xf;
switch (type) {
case KVASER_PCIEFD_PACK_TYPE_DATA:
ret = kvaser_pciefd_handle_data_packet(pcie, p, &buffer[pos]);
if (!(p->header[0] & KVASER_PCIEFD_RPACKET_RTR)) {
u8 data_len;
data_len = can_dlc2len(p->header[1] >>
KVASER_PCIEFD_RPACKET_DLC_SHIFT);
pos += DIV_ROUND_UP(data_len, 4);
}
break;
case KVASER_PCIEFD_PACK_TYPE_ACK:
ret = kvaser_pciefd_handle_ack_packet(pcie, p);
break;
case KVASER_PCIEFD_PACK_TYPE_STATUS:
ret = kvaser_pciefd_handle_status_packet(pcie, p);
break;
case KVASER_PCIEFD_PACK_TYPE_ERROR:
ret = kvaser_pciefd_handle_error_packet(pcie, p);
break;
case KVASER_PCIEFD_PACK_TYPE_EFRAME_ACK:
ret = kvaser_pciefd_handle_eack_packet(pcie, p);
break;
case KVASER_PCIEFD_PACK_TYPE_EFLUSH_ACK:
ret = kvaser_pciefd_handle_eflush_packet(pcie, p);
break;
case KVASER_PCIEFD_PACK_TYPE_ACK_DATA:
case KVASER_PCIEFD_PACK_TYPE_BUS_LOAD:
case KVASER_PCIEFD_PACK_TYPE_TXRQ:
dev_info(&pcie->pci->dev,
"Received unexpected packet type 0x%08X\n", type);
break;
default:
dev_err(&pcie->pci->dev, "Unknown packet type 0x%08X\n", type);
ret = -EIO;
break;
}
if (ret)
return ret;
/* Position does not point to the end of the package,
* corrupted packet size?
*/
if ((*start_pos + size) != pos)
return -EIO;
/* Point to the next packet header, if any */
*start_pos = pos;
return ret;
}
static int kvaser_pciefd_read_buffer(struct kvaser_pciefd *pcie, int dma_buf)
{
int pos = 0;
int res = 0;
do {
res = kvaser_pciefd_read_packet(pcie, &pos, dma_buf);
} while (!res && pos > 0 && pos < KVASER_PCIEFD_DMA_SIZE);
return res;
}
static int kvaser_pciefd_receive_irq(struct kvaser_pciefd *pcie)
{
u32 irq;
irq = ioread32(pcie->reg_base + KVASER_PCIEFD_SRB_IRQ_REG);
if (irq & KVASER_PCIEFD_SRB_IRQ_DPD0) {
kvaser_pciefd_read_buffer(pcie, 0);
/* Reset DMA buffer 0 */
iowrite32(KVASER_PCIEFD_SRB_CMD_RDB0,
pcie->reg_base + KVASER_PCIEFD_SRB_CMD_REG);
}
if (irq & KVASER_PCIEFD_SRB_IRQ_DPD1) {
kvaser_pciefd_read_buffer(pcie, 1);
/* Reset DMA buffer 1 */
iowrite32(KVASER_PCIEFD_SRB_CMD_RDB1,
pcie->reg_base + KVASER_PCIEFD_SRB_CMD_REG);
}
if (irq & KVASER_PCIEFD_SRB_IRQ_DOF0 ||
irq & KVASER_PCIEFD_SRB_IRQ_DOF1 ||
irq & KVASER_PCIEFD_SRB_IRQ_DUF0 ||
irq & KVASER_PCIEFD_SRB_IRQ_DUF1)
dev_err(&pcie->pci->dev, "DMA IRQ error 0x%08X\n", irq);
iowrite32(irq, pcie->reg_base + KVASER_PCIEFD_SRB_IRQ_REG);
return 0;
}
static int kvaser_pciefd_transmit_irq(struct kvaser_pciefd_can *can)
{
u32 irq = ioread32(can->reg_base + KVASER_PCIEFD_KCAN_IRQ_REG);
if (irq & KVASER_PCIEFD_KCAN_IRQ_TOF)
netdev_err(can->can.dev, "Tx FIFO overflow\n");
if (irq & KVASER_PCIEFD_KCAN_IRQ_TFD) {
u8 count = ioread32(can->reg_base +
KVASER_PCIEFD_KCAN_TX_NPACKETS_REG) & 0xff;
if (count == 0)
iowrite32(KVASER_PCIEFD_KCAN_CTRL_EFLUSH,
can->reg_base + KVASER_PCIEFD_KCAN_CTRL_REG);
}
if (irq & KVASER_PCIEFD_KCAN_IRQ_BPP)
netdev_err(can->can.dev,
"Fail to change bittiming, when not in reset mode\n");
if (irq & KVASER_PCIEFD_KCAN_IRQ_FDIC)
netdev_err(can->can.dev, "CAN FD frame in CAN mode\n");
if (irq & KVASER_PCIEFD_KCAN_IRQ_ROF)
netdev_err(can->can.dev, "Rx FIFO overflow\n");
iowrite32(irq, can->reg_base + KVASER_PCIEFD_KCAN_IRQ_REG);
return 0;
}
static irqreturn_t kvaser_pciefd_irq_handler(int irq, void *dev)
{
struct kvaser_pciefd *pcie = (struct kvaser_pciefd *)dev;
u32 board_irq;
int i;
board_irq = ioread32(pcie->reg_base + KVASER_PCIEFD_IRQ_REG);
if (!(board_irq & KVASER_PCIEFD_IRQ_ALL_MSK))
return IRQ_NONE;
if (board_irq & KVASER_PCIEFD_IRQ_SRB)
kvaser_pciefd_receive_irq(pcie);
for (i = 0; i < pcie->nr_channels; i++) {
if (!pcie->can[i]) {
dev_err(&pcie->pci->dev,
"IRQ mask points to unallocated controller\n");
break;
}
/* Check that mask matches channel (i) IRQ mask */
if (board_irq & (1 << i))
kvaser_pciefd_transmit_irq(pcie->can[i]);
}
iowrite32(board_irq, pcie->reg_base + KVASER_PCIEFD_IRQ_REG);
return IRQ_HANDLED;
}
static void kvaser_pciefd_teardown_can_ctrls(struct kvaser_pciefd *pcie)
{
int i;
struct kvaser_pciefd_can *can;
for (i = 0; i < pcie->nr_channels; i++) {
can = pcie->can[i];
if (can) {
iowrite32(0,
can->reg_base + KVASER_PCIEFD_KCAN_IEN_REG);
kvaser_pciefd_pwm_stop(can);
free_candev(can->can.dev);
}
}
}
static int kvaser_pciefd_probe(struct pci_dev *pdev,
const struct pci_device_id *id)
{
int err;
struct kvaser_pciefd *pcie;
pcie = devm_kzalloc(&pdev->dev, sizeof(*pcie), GFP_KERNEL);
if (!pcie)
return -ENOMEM;
pci_set_drvdata(pdev, pcie);
pcie->pci = pdev;
err = pci_enable_device(pdev);
if (err)
return err;
err = pci_request_regions(pdev, KVASER_PCIEFD_DRV_NAME);
if (err)
goto err_disable_pci;
pcie->reg_base = pci_iomap(pdev, 0, 0);
if (!pcie->reg_base) {
err = -ENOMEM;
goto err_release_regions;
}
err = kvaser_pciefd_setup_board(pcie);
if (err)
goto err_pci_iounmap;
err = kvaser_pciefd_setup_dma(pcie);
if (err)
goto err_pci_iounmap;
pci_set_master(pdev);
err = kvaser_pciefd_setup_can_ctrls(pcie);
if (err)
goto err_teardown_can_ctrls;
iowrite32(KVASER_PCIEFD_SRB_IRQ_DPD0 | KVASER_PCIEFD_SRB_IRQ_DPD1,
pcie->reg_base + KVASER_PCIEFD_SRB_IRQ_REG);
iowrite32(KVASER_PCIEFD_SRB_IRQ_DPD0 | KVASER_PCIEFD_SRB_IRQ_DPD1 |
KVASER_PCIEFD_SRB_IRQ_DOF0 | KVASER_PCIEFD_SRB_IRQ_DOF1 |
KVASER_PCIEFD_SRB_IRQ_DUF0 | KVASER_PCIEFD_SRB_IRQ_DUF1,
pcie->reg_base + KVASER_PCIEFD_SRB_IEN_REG);
/* Reset IRQ handling, expected to be off before */
iowrite32(KVASER_PCIEFD_IRQ_ALL_MSK,
pcie->reg_base + KVASER_PCIEFD_IRQ_REG);
iowrite32(KVASER_PCIEFD_IRQ_ALL_MSK,
pcie->reg_base + KVASER_PCIEFD_IEN_REG);
/* Ready the DMA buffers */
iowrite32(KVASER_PCIEFD_SRB_CMD_RDB0,
pcie->reg_base + KVASER_PCIEFD_SRB_CMD_REG);
iowrite32(KVASER_PCIEFD_SRB_CMD_RDB1,
pcie->reg_base + KVASER_PCIEFD_SRB_CMD_REG);
err = request_irq(pcie->pci->irq, kvaser_pciefd_irq_handler,
IRQF_SHARED, KVASER_PCIEFD_DRV_NAME, pcie);
if (err)
goto err_teardown_can_ctrls;
err = kvaser_pciefd_reg_candev(pcie);
if (err)
goto err_free_irq;
return 0;
err_free_irq:
free_irq(pcie->pci->irq, pcie);
err_teardown_can_ctrls:
kvaser_pciefd_teardown_can_ctrls(pcie);
iowrite32(0, pcie->reg_base + KVASER_PCIEFD_SRB_CTRL_REG);
pci_clear_master(pdev);
err_pci_iounmap:
pci_iounmap(pdev, pcie->reg_base);
err_release_regions:
pci_release_regions(pdev);
err_disable_pci:
pci_disable_device(pdev);
return err;
}
static void kvaser_pciefd_remove_all_ctrls(struct kvaser_pciefd *pcie)
{
struct kvaser_pciefd_can *can;
int i;
for (i = 0; i < pcie->nr_channels; i++) {
can = pcie->can[i];
if (can) {
iowrite32(0,
can->reg_base + KVASER_PCIEFD_KCAN_IEN_REG);
unregister_candev(can->can.dev);
del_timer(&can->bec_poll_timer);
kvaser_pciefd_pwm_stop(can);
free_candev(can->can.dev);
}
}
}
static void kvaser_pciefd_remove(struct pci_dev *pdev)
{
struct kvaser_pciefd *pcie = pci_get_drvdata(pdev);
kvaser_pciefd_remove_all_ctrls(pcie);
/* Turn off IRQ generation */
iowrite32(0, pcie->reg_base + KVASER_PCIEFD_SRB_CTRL_REG);
iowrite32(KVASER_PCIEFD_IRQ_ALL_MSK,
pcie->reg_base + KVASER_PCIEFD_IRQ_REG);
iowrite32(0, pcie->reg_base + KVASER_PCIEFD_IEN_REG);
free_irq(pcie->pci->irq, pcie);
pci_clear_master(pdev);
pci_iounmap(pdev, pcie->reg_base);
pci_release_regions(pdev);
pci_disable_device(pdev);
}
static struct pci_driver kvaser_pciefd = {
.name = KVASER_PCIEFD_DRV_NAME,
.id_table = kvaser_pciefd_id_table,
.probe = kvaser_pciefd_probe,
.remove = kvaser_pciefd_remove,
};
module_pci_driver(kvaser_pciefd)