| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* Xilinx CAN device driver |
| * |
| * Copyright (C) 2012 - 2014 Xilinx, Inc. |
| * Copyright (C) 2009 PetaLogix. All rights reserved. |
| * Copyright (C) 2017 - 2018 Sandvik Mining and Construction Oy |
| * |
| * Description: |
| * This driver is developed for Axi CAN IP and for Zynq CANPS Controller. |
| */ |
| |
| #include <linux/clk.h> |
| #include <linux/errno.h> |
| #include <linux/init.h> |
| #include <linux/interrupt.h> |
| #include <linux/io.h> |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/netdevice.h> |
| #include <linux/of.h> |
| #include <linux/of_device.h> |
| #include <linux/platform_device.h> |
| #include <linux/skbuff.h> |
| #include <linux/spinlock.h> |
| #include <linux/string.h> |
| #include <linux/types.h> |
| #include <linux/can/dev.h> |
| #include <linux/can/error.h> |
| #include <linux/can/led.h> |
| #include <linux/pm_runtime.h> |
| |
| #define DRIVER_NAME "xilinx_can" |
| |
| /* CAN registers set */ |
| enum xcan_reg { |
| XCAN_SRR_OFFSET = 0x00, /* Software reset */ |
| XCAN_MSR_OFFSET = 0x04, /* Mode select */ |
| XCAN_BRPR_OFFSET = 0x08, /* Baud rate prescaler */ |
| XCAN_BTR_OFFSET = 0x0C, /* Bit timing */ |
| XCAN_ECR_OFFSET = 0x10, /* Error counter */ |
| XCAN_ESR_OFFSET = 0x14, /* Error status */ |
| XCAN_SR_OFFSET = 0x18, /* Status */ |
| XCAN_ISR_OFFSET = 0x1C, /* Interrupt status */ |
| XCAN_IER_OFFSET = 0x20, /* Interrupt enable */ |
| XCAN_ICR_OFFSET = 0x24, /* Interrupt clear */ |
| |
| /* not on CAN FD cores */ |
| XCAN_TXFIFO_OFFSET = 0x30, /* TX FIFO base */ |
| XCAN_RXFIFO_OFFSET = 0x50, /* RX FIFO base */ |
| XCAN_AFR_OFFSET = 0x60, /* Acceptance Filter */ |
| |
| /* only on CAN FD cores */ |
| XCAN_F_BRPR_OFFSET = 0x088, /* Data Phase Baud Rate |
| * Prescalar |
| */ |
| XCAN_F_BTR_OFFSET = 0x08C, /* Data Phase Bit Timing */ |
| XCAN_TRR_OFFSET = 0x0090, /* TX Buffer Ready Request */ |
| XCAN_AFR_EXT_OFFSET = 0x00E0, /* Acceptance Filter */ |
| XCAN_FSR_OFFSET = 0x00E8, /* RX FIFO Status */ |
| XCAN_TXMSG_BASE_OFFSET = 0x0100, /* TX Message Space */ |
| XCAN_RXMSG_BASE_OFFSET = 0x1100, /* RX Message Space */ |
| XCAN_RXMSG_2_BASE_OFFSET = 0x2100, /* RX Message Space */ |
| XCAN_AFR_2_MASK_OFFSET = 0x0A00, /* Acceptance Filter MASK */ |
| XCAN_AFR_2_ID_OFFSET = 0x0A04, /* Acceptance Filter ID */ |
| }; |
| |
| #define XCAN_FRAME_ID_OFFSET(frame_base) ((frame_base) + 0x00) |
| #define XCAN_FRAME_DLC_OFFSET(frame_base) ((frame_base) + 0x04) |
| #define XCAN_FRAME_DW1_OFFSET(frame_base) ((frame_base) + 0x08) |
| #define XCAN_FRAME_DW2_OFFSET(frame_base) ((frame_base) + 0x0C) |
| #define XCANFD_FRAME_DW_OFFSET(frame_base) ((frame_base) + 0x08) |
| |
| #define XCAN_CANFD_FRAME_SIZE 0x48 |
| #define XCAN_TXMSG_FRAME_OFFSET(n) (XCAN_TXMSG_BASE_OFFSET + \ |
| XCAN_CANFD_FRAME_SIZE * (n)) |
| #define XCAN_RXMSG_FRAME_OFFSET(n) (XCAN_RXMSG_BASE_OFFSET + \ |
| XCAN_CANFD_FRAME_SIZE * (n)) |
| #define XCAN_RXMSG_2_FRAME_OFFSET(n) (XCAN_RXMSG_2_BASE_OFFSET + \ |
| XCAN_CANFD_FRAME_SIZE * (n)) |
| |
| /* the single TX mailbox used by this driver on CAN FD HW */ |
| #define XCAN_TX_MAILBOX_IDX 0 |
| |
| /* CAN register bit masks - XCAN_<REG>_<BIT>_MASK */ |
| #define XCAN_SRR_CEN_MASK 0x00000002 /* CAN enable */ |
| #define XCAN_SRR_RESET_MASK 0x00000001 /* Soft Reset the CAN core */ |
| #define XCAN_MSR_LBACK_MASK 0x00000002 /* Loop back mode select */ |
| #define XCAN_MSR_SLEEP_MASK 0x00000001 /* Sleep mode select */ |
| #define XCAN_BRPR_BRP_MASK 0x000000FF /* Baud rate prescaler */ |
| #define XCAN_BTR_SJW_MASK 0x00000180 /* Synchronous jump width */ |
| #define XCAN_BTR_TS2_MASK 0x00000070 /* Time segment 2 */ |
| #define XCAN_BTR_TS1_MASK 0x0000000F /* Time segment 1 */ |
| #define XCAN_BTR_SJW_MASK_CANFD 0x000F0000 /* Synchronous jump width */ |
| #define XCAN_BTR_TS2_MASK_CANFD 0x00000F00 /* Time segment 2 */ |
| #define XCAN_BTR_TS1_MASK_CANFD 0x0000003F /* Time segment 1 */ |
| #define XCAN_ECR_REC_MASK 0x0000FF00 /* Receive error counter */ |
| #define XCAN_ECR_TEC_MASK 0x000000FF /* Transmit error counter */ |
| #define XCAN_ESR_ACKER_MASK 0x00000010 /* ACK error */ |
| #define XCAN_ESR_BERR_MASK 0x00000008 /* Bit error */ |
| #define XCAN_ESR_STER_MASK 0x00000004 /* Stuff error */ |
| #define XCAN_ESR_FMER_MASK 0x00000002 /* Form error */ |
| #define XCAN_ESR_CRCER_MASK 0x00000001 /* CRC error */ |
| #define XCAN_SR_TXFLL_MASK 0x00000400 /* TX FIFO is full */ |
| #define XCAN_SR_ESTAT_MASK 0x00000180 /* Error status */ |
| #define XCAN_SR_ERRWRN_MASK 0x00000040 /* Error warning */ |
| #define XCAN_SR_NORMAL_MASK 0x00000008 /* Normal mode */ |
| #define XCAN_SR_LBACK_MASK 0x00000002 /* Loop back mode */ |
| #define XCAN_SR_CONFIG_MASK 0x00000001 /* Configuration mode */ |
| #define XCAN_IXR_RXMNF_MASK 0x00020000 /* RX match not finished */ |
| #define XCAN_IXR_TXFEMP_MASK 0x00004000 /* TX FIFO Empty */ |
| #define XCAN_IXR_WKUP_MASK 0x00000800 /* Wake up interrupt */ |
| #define XCAN_IXR_SLP_MASK 0x00000400 /* Sleep interrupt */ |
| #define XCAN_IXR_BSOFF_MASK 0x00000200 /* Bus off interrupt */ |
| #define XCAN_IXR_ERROR_MASK 0x00000100 /* Error interrupt */ |
| #define XCAN_IXR_RXNEMP_MASK 0x00000080 /* RX FIFO NotEmpty intr */ |
| #define XCAN_IXR_RXOFLW_MASK 0x00000040 /* RX FIFO Overflow intr */ |
| #define XCAN_IXR_RXOK_MASK 0x00000010 /* Message received intr */ |
| #define XCAN_IXR_TXFLL_MASK 0x00000004 /* Tx FIFO Full intr */ |
| #define XCAN_IXR_TXOK_MASK 0x00000002 /* TX successful intr */ |
| #define XCAN_IXR_ARBLST_MASK 0x00000001 /* Arbitration lost intr */ |
| #define XCAN_IDR_ID1_MASK 0xFFE00000 /* Standard msg identifier */ |
| #define XCAN_IDR_SRR_MASK 0x00100000 /* Substitute remote TXreq */ |
| #define XCAN_IDR_IDE_MASK 0x00080000 /* Identifier extension */ |
| #define XCAN_IDR_ID2_MASK 0x0007FFFE /* Extended message ident */ |
| #define XCAN_IDR_RTR_MASK 0x00000001 /* Remote TX request */ |
| #define XCAN_DLCR_DLC_MASK 0xF0000000 /* Data length code */ |
| #define XCAN_FSR_FL_MASK 0x00003F00 /* RX Fill Level */ |
| #define XCAN_2_FSR_FL_MASK 0x00007F00 /* RX Fill Level */ |
| #define XCAN_FSR_IRI_MASK 0x00000080 /* RX Increment Read Index */ |
| #define XCAN_FSR_RI_MASK 0x0000001F /* RX Read Index */ |
| #define XCAN_2_FSR_RI_MASK 0x0000003F /* RX Read Index */ |
| #define XCAN_DLCR_EDL_MASK 0x08000000 /* EDL Mask in DLC */ |
| #define XCAN_DLCR_BRS_MASK 0x04000000 /* BRS Mask in DLC */ |
| |
| /* CAN register bit shift - XCAN_<REG>_<BIT>_SHIFT */ |
| #define XCAN_BTR_SJW_SHIFT 7 /* Synchronous jump width */ |
| #define XCAN_BTR_TS2_SHIFT 4 /* Time segment 2 */ |
| #define XCAN_BTR_SJW_SHIFT_CANFD 16 /* Synchronous jump width */ |
| #define XCAN_BTR_TS2_SHIFT_CANFD 8 /* Time segment 2 */ |
| #define XCAN_IDR_ID1_SHIFT 21 /* Standard Messg Identifier */ |
| #define XCAN_IDR_ID2_SHIFT 1 /* Extended Message Identifier */ |
| #define XCAN_DLCR_DLC_SHIFT 28 /* Data length code */ |
| #define XCAN_ESR_REC_SHIFT 8 /* Rx Error Count */ |
| |
| /* CAN frame length constants */ |
| #define XCAN_FRAME_MAX_DATA_LEN 8 |
| #define XCANFD_DW_BYTES 4 |
| #define XCAN_TIMEOUT (1 * HZ) |
| |
| /* TX-FIFO-empty interrupt available */ |
| #define XCAN_FLAG_TXFEMP 0x0001 |
| /* RX Match Not Finished interrupt available */ |
| #define XCAN_FLAG_RXMNF 0x0002 |
| /* Extended acceptance filters with control at 0xE0 */ |
| #define XCAN_FLAG_EXT_FILTERS 0x0004 |
| /* TX mailboxes instead of TX FIFO */ |
| #define XCAN_FLAG_TX_MAILBOXES 0x0008 |
| /* RX FIFO with each buffer in separate registers at 0x1100 |
| * instead of the regular FIFO at 0x50 |
| */ |
| #define XCAN_FLAG_RX_FIFO_MULTI 0x0010 |
| #define XCAN_FLAG_CANFD_2 0x0020 |
| |
| enum xcan_ip_type { |
| XAXI_CAN = 0, |
| XZYNQ_CANPS, |
| XAXI_CANFD, |
| XAXI_CANFD_2_0, |
| }; |
| |
| struct xcan_devtype_data { |
| enum xcan_ip_type cantype; |
| unsigned int flags; |
| const struct can_bittiming_const *bittiming_const; |
| const char *bus_clk_name; |
| unsigned int btr_ts2_shift; |
| unsigned int btr_sjw_shift; |
| }; |
| |
| /** |
| * struct xcan_priv - This definition define CAN driver instance |
| * @can: CAN private data structure. |
| * @tx_lock: Lock for synchronizing TX interrupt handling |
| * @tx_head: Tx CAN packets ready to send on the queue |
| * @tx_tail: Tx CAN packets successfully sended on the queue |
| * @tx_max: Maximum number packets the driver can send |
| * @napi: NAPI structure |
| * @read_reg: For reading data from CAN registers |
| * @write_reg: For writing data to CAN registers |
| * @dev: Network device data structure |
| * @reg_base: Ioremapped address to registers |
| * @irq_flags: For request_irq() |
| * @bus_clk: Pointer to struct clk |
| * @can_clk: Pointer to struct clk |
| * @devtype: Device type specific constants |
| */ |
| struct xcan_priv { |
| struct can_priv can; |
| spinlock_t tx_lock; |
| unsigned int tx_head; |
| unsigned int tx_tail; |
| unsigned int tx_max; |
| struct napi_struct napi; |
| u32 (*read_reg)(const struct xcan_priv *priv, enum xcan_reg reg); |
| void (*write_reg)(const struct xcan_priv *priv, enum xcan_reg reg, |
| u32 val); |
| struct device *dev; |
| void __iomem *reg_base; |
| unsigned long irq_flags; |
| struct clk *bus_clk; |
| struct clk *can_clk; |
| struct xcan_devtype_data devtype; |
| }; |
| |
| /* CAN Bittiming constants as per Xilinx CAN specs */ |
| static const struct can_bittiming_const xcan_bittiming_const = { |
| .name = DRIVER_NAME, |
| .tseg1_min = 1, |
| .tseg1_max = 16, |
| .tseg2_min = 1, |
| .tseg2_max = 8, |
| .sjw_max = 4, |
| .brp_min = 1, |
| .brp_max = 256, |
| .brp_inc = 1, |
| }; |
| |
| /* AXI CANFD Arbitration Bittiming constants as per AXI CANFD 1.0 spec */ |
| static const struct can_bittiming_const xcan_bittiming_const_canfd = { |
| .name = DRIVER_NAME, |
| .tseg1_min = 1, |
| .tseg1_max = 64, |
| .tseg2_min = 1, |
| .tseg2_max = 16, |
| .sjw_max = 16, |
| .brp_min = 1, |
| .brp_max = 256, |
| .brp_inc = 1, |
| }; |
| |
| /* AXI CANFD Data Bittiming constants as per AXI CANFD 1.0 specs */ |
| static struct can_bittiming_const xcan_data_bittiming_const_canfd = { |
| .name = DRIVER_NAME, |
| .tseg1_min = 1, |
| .tseg1_max = 16, |
| .tseg2_min = 1, |
| .tseg2_max = 8, |
| .sjw_max = 8, |
| .brp_min = 1, |
| .brp_max = 256, |
| .brp_inc = 1, |
| }; |
| |
| /* AXI CANFD 2.0 Arbitration Bittiming constants as per AXI CANFD 2.0 spec */ |
| static const struct can_bittiming_const xcan_bittiming_const_canfd2 = { |
| .name = DRIVER_NAME, |
| .tseg1_min = 1, |
| .tseg1_max = 256, |
| .tseg2_min = 1, |
| .tseg2_max = 128, |
| .sjw_max = 128, |
| .brp_min = 1, |
| .brp_max = 256, |
| .brp_inc = 1, |
| }; |
| |
| /* AXI CANFD 2.0 Data Bittiming constants as per AXI CANFD 2.0 spec */ |
| static struct can_bittiming_const xcan_data_bittiming_const_canfd2 = { |
| .name = DRIVER_NAME, |
| .tseg1_min = 1, |
| .tseg1_max = 32, |
| .tseg2_min = 1, |
| .tseg2_max = 16, |
| .sjw_max = 16, |
| .brp_min = 1, |
| .brp_max = 256, |
| .brp_inc = 1, |
| }; |
| |
| /** |
| * xcan_write_reg_le - Write a value to the device register little endian |
| * @priv: Driver private data structure |
| * @reg: Register offset |
| * @val: Value to write at the Register offset |
| * |
| * Write data to the paricular CAN register |
| */ |
| static void xcan_write_reg_le(const struct xcan_priv *priv, enum xcan_reg reg, |
| u32 val) |
| { |
| iowrite32(val, priv->reg_base + reg); |
| } |
| |
| /** |
| * xcan_read_reg_le - Read a value from the device register little endian |
| * @priv: Driver private data structure |
| * @reg: Register offset |
| * |
| * Read data from the particular CAN register |
| * Return: value read from the CAN register |
| */ |
| static u32 xcan_read_reg_le(const struct xcan_priv *priv, enum xcan_reg reg) |
| { |
| return ioread32(priv->reg_base + reg); |
| } |
| |
| /** |
| * xcan_write_reg_be - Write a value to the device register big endian |
| * @priv: Driver private data structure |
| * @reg: Register offset |
| * @val: Value to write at the Register offset |
| * |
| * Write data to the paricular CAN register |
| */ |
| static void xcan_write_reg_be(const struct xcan_priv *priv, enum xcan_reg reg, |
| u32 val) |
| { |
| iowrite32be(val, priv->reg_base + reg); |
| } |
| |
| /** |
| * xcan_read_reg_be - Read a value from the device register big endian |
| * @priv: Driver private data structure |
| * @reg: Register offset |
| * |
| * Read data from the particular CAN register |
| * Return: value read from the CAN register |
| */ |
| static u32 xcan_read_reg_be(const struct xcan_priv *priv, enum xcan_reg reg) |
| { |
| return ioread32be(priv->reg_base + reg); |
| } |
| |
| /** |
| * xcan_rx_int_mask - Get the mask for the receive interrupt |
| * @priv: Driver private data structure |
| * |
| * Return: The receive interrupt mask used by the driver on this HW |
| */ |
| static u32 xcan_rx_int_mask(const struct xcan_priv *priv) |
| { |
| /* RXNEMP is better suited for our use case as it cannot be cleared |
| * while the FIFO is non-empty, but CAN FD HW does not have it |
| */ |
| if (priv->devtype.flags & XCAN_FLAG_RX_FIFO_MULTI) |
| return XCAN_IXR_RXOK_MASK; |
| else |
| return XCAN_IXR_RXNEMP_MASK; |
| } |
| |
| /** |
| * set_reset_mode - Resets the CAN device mode |
| * @ndev: Pointer to net_device structure |
| * |
| * This is the driver reset mode routine.The driver |
| * enters into configuration mode. |
| * |
| * Return: 0 on success and failure value on error |
| */ |
| static int set_reset_mode(struct net_device *ndev) |
| { |
| struct xcan_priv *priv = netdev_priv(ndev); |
| unsigned long timeout; |
| |
| priv->write_reg(priv, XCAN_SRR_OFFSET, XCAN_SRR_RESET_MASK); |
| |
| timeout = jiffies + XCAN_TIMEOUT; |
| while (!(priv->read_reg(priv, XCAN_SR_OFFSET) & XCAN_SR_CONFIG_MASK)) { |
| if (time_after(jiffies, timeout)) { |
| netdev_warn(ndev, "timed out for config mode\n"); |
| return -ETIMEDOUT; |
| } |
| usleep_range(500, 10000); |
| } |
| |
| /* reset clears FIFOs */ |
| priv->tx_head = 0; |
| priv->tx_tail = 0; |
| |
| return 0; |
| } |
| |
| /** |
| * xcan_set_bittiming - CAN set bit timing routine |
| * @ndev: Pointer to net_device structure |
| * |
| * This is the driver set bittiming routine. |
| * Return: 0 on success and failure value on error |
| */ |
| static int xcan_set_bittiming(struct net_device *ndev) |
| { |
| struct xcan_priv *priv = netdev_priv(ndev); |
| struct can_bittiming *bt = &priv->can.bittiming; |
| struct can_bittiming *dbt = &priv->can.data_bittiming; |
| u32 btr0, btr1; |
| u32 is_config_mode; |
| |
| /* Check whether Xilinx CAN is in configuration mode. |
| * It cannot set bit timing if Xilinx CAN is not in configuration mode. |
| */ |
| is_config_mode = priv->read_reg(priv, XCAN_SR_OFFSET) & |
| XCAN_SR_CONFIG_MASK; |
| if (!is_config_mode) { |
| netdev_alert(ndev, |
| "BUG! Cannot set bittiming - CAN is not in config mode\n"); |
| return -EPERM; |
| } |
| |
| /* Setting Baud Rate prescalar value in BRPR Register */ |
| btr0 = (bt->brp - 1); |
| |
| /* Setting Time Segment 1 in BTR Register */ |
| btr1 = (bt->prop_seg + bt->phase_seg1 - 1); |
| |
| /* Setting Time Segment 2 in BTR Register */ |
| btr1 |= (bt->phase_seg2 - 1) << priv->devtype.btr_ts2_shift; |
| |
| /* Setting Synchronous jump width in BTR Register */ |
| btr1 |= (bt->sjw - 1) << priv->devtype.btr_sjw_shift; |
| |
| priv->write_reg(priv, XCAN_BRPR_OFFSET, btr0); |
| priv->write_reg(priv, XCAN_BTR_OFFSET, btr1); |
| |
| if (priv->devtype.cantype == XAXI_CANFD || |
| priv->devtype.cantype == XAXI_CANFD_2_0) { |
| /* Setting Baud Rate prescalar value in F_BRPR Register */ |
| btr0 = dbt->brp - 1; |
| |
| /* Setting Time Segment 1 in BTR Register */ |
| btr1 = dbt->prop_seg + dbt->phase_seg1 - 1; |
| |
| /* Setting Time Segment 2 in BTR Register */ |
| btr1 |= (dbt->phase_seg2 - 1) << priv->devtype.btr_ts2_shift; |
| |
| /* Setting Synchronous jump width in BTR Register */ |
| btr1 |= (dbt->sjw - 1) << priv->devtype.btr_sjw_shift; |
| |
| priv->write_reg(priv, XCAN_F_BRPR_OFFSET, btr0); |
| priv->write_reg(priv, XCAN_F_BTR_OFFSET, btr1); |
| } |
| |
| netdev_dbg(ndev, "BRPR=0x%08x, BTR=0x%08x\n", |
| priv->read_reg(priv, XCAN_BRPR_OFFSET), |
| priv->read_reg(priv, XCAN_BTR_OFFSET)); |
| |
| return 0; |
| } |
| |
| /** |
| * xcan_chip_start - This the drivers start routine |
| * @ndev: Pointer to net_device structure |
| * |
| * This is the drivers start routine. |
| * Based on the State of the CAN device it puts |
| * the CAN device into a proper mode. |
| * |
| * Return: 0 on success and failure value on error |
| */ |
| static int xcan_chip_start(struct net_device *ndev) |
| { |
| struct xcan_priv *priv = netdev_priv(ndev); |
| u32 reg_msr; |
| int err; |
| u32 ier; |
| |
| /* Check if it is in reset mode */ |
| err = set_reset_mode(ndev); |
| if (err < 0) |
| return err; |
| |
| err = xcan_set_bittiming(ndev); |
| if (err < 0) |
| return err; |
| |
| /* Enable interrupts */ |
| ier = XCAN_IXR_TXOK_MASK | XCAN_IXR_BSOFF_MASK | |
| XCAN_IXR_WKUP_MASK | XCAN_IXR_SLP_MASK | |
| XCAN_IXR_ERROR_MASK | XCAN_IXR_RXOFLW_MASK | |
| XCAN_IXR_ARBLST_MASK | xcan_rx_int_mask(priv); |
| |
| if (priv->devtype.flags & XCAN_FLAG_RXMNF) |
| ier |= XCAN_IXR_RXMNF_MASK; |
| |
| priv->write_reg(priv, XCAN_IER_OFFSET, ier); |
| |
| /* Check whether it is loopback mode or normal mode */ |
| if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK) { |
| reg_msr = XCAN_MSR_LBACK_MASK; |
| } else { |
| reg_msr = 0x0; |
| } |
| |
| /* enable the first extended filter, if any, as cores with extended |
| * filtering default to non-receipt if all filters are disabled |
| */ |
| if (priv->devtype.flags & XCAN_FLAG_EXT_FILTERS) |
| priv->write_reg(priv, XCAN_AFR_EXT_OFFSET, 0x00000001); |
| |
| priv->write_reg(priv, XCAN_MSR_OFFSET, reg_msr); |
| priv->write_reg(priv, XCAN_SRR_OFFSET, XCAN_SRR_CEN_MASK); |
| |
| netdev_dbg(ndev, "status:#x%08x\n", |
| priv->read_reg(priv, XCAN_SR_OFFSET)); |
| |
| priv->can.state = CAN_STATE_ERROR_ACTIVE; |
| return 0; |
| } |
| |
| /** |
| * xcan_do_set_mode - This sets the mode of the driver |
| * @ndev: Pointer to net_device structure |
| * @mode: Tells the mode of the driver |
| * |
| * This check the drivers state and calls the |
| * the corresponding modes to set. |
| * |
| * Return: 0 on success and failure value on error |
| */ |
| static int xcan_do_set_mode(struct net_device *ndev, enum can_mode mode) |
| { |
| int ret; |
| |
| switch (mode) { |
| case CAN_MODE_START: |
| ret = xcan_chip_start(ndev); |
| if (ret < 0) { |
| netdev_err(ndev, "xcan_chip_start failed!\n"); |
| return ret; |
| } |
| netif_wake_queue(ndev); |
| break; |
| default: |
| ret = -EOPNOTSUPP; |
| break; |
| } |
| |
| return ret; |
| } |
| |
| /** |
| * xcan_write_frame - Write a frame to HW |
| * @priv: Driver private data structure |
| * @skb: sk_buff pointer that contains data to be Txed |
| * @frame_offset: Register offset to write the frame to |
| */ |
| static void xcan_write_frame(struct xcan_priv *priv, struct sk_buff *skb, |
| int frame_offset) |
| { |
| u32 id, dlc, data[2] = {0, 0}; |
| struct canfd_frame *cf = (struct canfd_frame *)skb->data; |
| u32 ramoff, dwindex = 0, i; |
| |
| /* Watch carefully on the bit sequence */ |
| if (cf->can_id & CAN_EFF_FLAG) { |
| /* Extended CAN ID format */ |
| id = ((cf->can_id & CAN_EFF_MASK) << XCAN_IDR_ID2_SHIFT) & |
| XCAN_IDR_ID2_MASK; |
| id |= (((cf->can_id & CAN_EFF_MASK) >> |
| (CAN_EFF_ID_BITS - CAN_SFF_ID_BITS)) << |
| XCAN_IDR_ID1_SHIFT) & XCAN_IDR_ID1_MASK; |
| |
| /* The substibute remote TX request bit should be "1" |
| * for extended frames as in the Xilinx CAN datasheet |
| */ |
| id |= XCAN_IDR_IDE_MASK | XCAN_IDR_SRR_MASK; |
| |
| if (cf->can_id & CAN_RTR_FLAG) |
| /* Extended frames remote TX request */ |
| id |= XCAN_IDR_RTR_MASK; |
| } else { |
| /* Standard CAN ID format */ |
| id = ((cf->can_id & CAN_SFF_MASK) << XCAN_IDR_ID1_SHIFT) & |
| XCAN_IDR_ID1_MASK; |
| |
| if (cf->can_id & CAN_RTR_FLAG) |
| /* Standard frames remote TX request */ |
| id |= XCAN_IDR_SRR_MASK; |
| } |
| |
| dlc = can_len2dlc(cf->len) << XCAN_DLCR_DLC_SHIFT; |
| if (can_is_canfd_skb(skb)) { |
| if (cf->flags & CANFD_BRS) |
| dlc |= XCAN_DLCR_BRS_MASK; |
| dlc |= XCAN_DLCR_EDL_MASK; |
| } |
| |
| priv->write_reg(priv, XCAN_FRAME_ID_OFFSET(frame_offset), id); |
| /* If the CAN frame is RTR frame this write triggers transmission |
| * (not on CAN FD) |
| */ |
| priv->write_reg(priv, XCAN_FRAME_DLC_OFFSET(frame_offset), dlc); |
| if (priv->devtype.cantype == XAXI_CANFD || |
| priv->devtype.cantype == XAXI_CANFD_2_0) { |
| for (i = 0; i < cf->len; i += 4) { |
| ramoff = XCANFD_FRAME_DW_OFFSET(frame_offset) + |
| (dwindex * XCANFD_DW_BYTES); |
| priv->write_reg(priv, ramoff, |
| be32_to_cpup((__be32 *)(cf->data + i))); |
| dwindex++; |
| } |
| } else { |
| if (cf->len > 0) |
| data[0] = be32_to_cpup((__be32 *)(cf->data + 0)); |
| if (cf->len > 4) |
| data[1] = be32_to_cpup((__be32 *)(cf->data + 4)); |
| |
| if (!(cf->can_id & CAN_RTR_FLAG)) { |
| priv->write_reg(priv, |
| XCAN_FRAME_DW1_OFFSET(frame_offset), |
| data[0]); |
| /* If the CAN frame is Standard/Extended frame this |
| * write triggers transmission (not on CAN FD) |
| */ |
| priv->write_reg(priv, |
| XCAN_FRAME_DW2_OFFSET(frame_offset), |
| data[1]); |
| } |
| } |
| } |
| |
| /** |
| * xcan_start_xmit_fifo - Starts the transmission (FIFO mode) |
| * @skb: sk_buff pointer that contains data to be Txed |
| * @ndev: Pointer to net_device structure |
| * |
| * Return: 0 on success, -ENOSPC if FIFO is full. |
| */ |
| static int xcan_start_xmit_fifo(struct sk_buff *skb, struct net_device *ndev) |
| { |
| struct xcan_priv *priv = netdev_priv(ndev); |
| unsigned long flags; |
| |
| /* Check if the TX buffer is full */ |
| if (unlikely(priv->read_reg(priv, XCAN_SR_OFFSET) & |
| XCAN_SR_TXFLL_MASK)) |
| return -ENOSPC; |
| |
| can_put_echo_skb(skb, ndev, priv->tx_head % priv->tx_max); |
| |
| spin_lock_irqsave(&priv->tx_lock, flags); |
| |
| priv->tx_head++; |
| |
| xcan_write_frame(priv, skb, XCAN_TXFIFO_OFFSET); |
| |
| /* Clear TX-FIFO-empty interrupt for xcan_tx_interrupt() */ |
| if (priv->tx_max > 1) |
| priv->write_reg(priv, XCAN_ICR_OFFSET, XCAN_IXR_TXFEMP_MASK); |
| |
| /* Check if the TX buffer is full */ |
| if ((priv->tx_head - priv->tx_tail) == priv->tx_max) |
| netif_stop_queue(ndev); |
| |
| spin_unlock_irqrestore(&priv->tx_lock, flags); |
| |
| return 0; |
| } |
| |
| /** |
| * xcan_start_xmit_mailbox - Starts the transmission (mailbox mode) |
| * @skb: sk_buff pointer that contains data to be Txed |
| * @ndev: Pointer to net_device structure |
| * |
| * Return: 0 on success, -ENOSPC if there is no space |
| */ |
| static int xcan_start_xmit_mailbox(struct sk_buff *skb, struct net_device *ndev) |
| { |
| struct xcan_priv *priv = netdev_priv(ndev); |
| unsigned long flags; |
| |
| if (unlikely(priv->read_reg(priv, XCAN_TRR_OFFSET) & |
| BIT(XCAN_TX_MAILBOX_IDX))) |
| return -ENOSPC; |
| |
| can_put_echo_skb(skb, ndev, 0); |
| |
| spin_lock_irqsave(&priv->tx_lock, flags); |
| |
| priv->tx_head++; |
| |
| xcan_write_frame(priv, skb, |
| XCAN_TXMSG_FRAME_OFFSET(XCAN_TX_MAILBOX_IDX)); |
| |
| /* Mark buffer as ready for transmit */ |
| priv->write_reg(priv, XCAN_TRR_OFFSET, BIT(XCAN_TX_MAILBOX_IDX)); |
| |
| netif_stop_queue(ndev); |
| |
| spin_unlock_irqrestore(&priv->tx_lock, flags); |
| |
| return 0; |
| } |
| |
| /** |
| * xcan_start_xmit - Starts the transmission |
| * @skb: sk_buff pointer that contains data to be Txed |
| * @ndev: Pointer to net_device structure |
| * |
| * This function is invoked from upper layers to initiate transmission. |
| * |
| * Return: NETDEV_TX_OK on success and NETDEV_TX_BUSY when the tx queue is full |
| */ |
| static netdev_tx_t xcan_start_xmit(struct sk_buff *skb, struct net_device *ndev) |
| { |
| struct xcan_priv *priv = netdev_priv(ndev); |
| int ret; |
| |
| if (can_dropped_invalid_skb(ndev, skb)) |
| return NETDEV_TX_OK; |
| |
| if (priv->devtype.flags & XCAN_FLAG_TX_MAILBOXES) |
| ret = xcan_start_xmit_mailbox(skb, ndev); |
| else |
| ret = xcan_start_xmit_fifo(skb, ndev); |
| |
| if (ret < 0) { |
| netdev_err(ndev, "BUG!, TX full when queue awake!\n"); |
| netif_stop_queue(ndev); |
| return NETDEV_TX_BUSY; |
| } |
| |
| return NETDEV_TX_OK; |
| } |
| |
| /** |
| * xcan_rx - Is called from CAN isr to complete the received |
| * frame processing |
| * @ndev: Pointer to net_device structure |
| * @frame_base: Register offset to the frame to be read |
| * |
| * This function is invoked from the CAN isr(poll) to process the Rx frames. It |
| * does minimal processing and invokes "netif_receive_skb" to complete further |
| * processing. |
| * Return: 1 on success and 0 on failure. |
| */ |
| static int xcan_rx(struct net_device *ndev, int frame_base) |
| { |
| struct xcan_priv *priv = netdev_priv(ndev); |
| struct net_device_stats *stats = &ndev->stats; |
| struct can_frame *cf; |
| struct sk_buff *skb; |
| u32 id_xcan, dlc, data[2] = {0, 0}; |
| |
| skb = alloc_can_skb(ndev, &cf); |
| if (unlikely(!skb)) { |
| stats->rx_dropped++; |
| return 0; |
| } |
| |
| /* Read a frame from Xilinx zynq CANPS */ |
| id_xcan = priv->read_reg(priv, XCAN_FRAME_ID_OFFSET(frame_base)); |
| dlc = priv->read_reg(priv, XCAN_FRAME_DLC_OFFSET(frame_base)) >> |
| XCAN_DLCR_DLC_SHIFT; |
| |
| /* Change Xilinx CAN data length format to socketCAN data format */ |
| cf->can_dlc = get_can_dlc(dlc); |
| |
| /* Change Xilinx CAN ID format to socketCAN ID format */ |
| if (id_xcan & XCAN_IDR_IDE_MASK) { |
| /* The received frame is an Extended format frame */ |
| cf->can_id = (id_xcan & XCAN_IDR_ID1_MASK) >> 3; |
| cf->can_id |= (id_xcan & XCAN_IDR_ID2_MASK) >> |
| XCAN_IDR_ID2_SHIFT; |
| cf->can_id |= CAN_EFF_FLAG; |
| if (id_xcan & XCAN_IDR_RTR_MASK) |
| cf->can_id |= CAN_RTR_FLAG; |
| } else { |
| /* The received frame is a standard format frame */ |
| cf->can_id = (id_xcan & XCAN_IDR_ID1_MASK) >> |
| XCAN_IDR_ID1_SHIFT; |
| if (id_xcan & XCAN_IDR_SRR_MASK) |
| cf->can_id |= CAN_RTR_FLAG; |
| } |
| |
| /* DW1/DW2 must always be read to remove message from RXFIFO */ |
| data[0] = priv->read_reg(priv, XCAN_FRAME_DW1_OFFSET(frame_base)); |
| data[1] = priv->read_reg(priv, XCAN_FRAME_DW2_OFFSET(frame_base)); |
| |
| if (!(cf->can_id & CAN_RTR_FLAG)) { |
| /* Change Xilinx CAN data format to socketCAN data format */ |
| if (cf->can_dlc > 0) |
| *(__be32 *)(cf->data) = cpu_to_be32(data[0]); |
| if (cf->can_dlc > 4) |
| *(__be32 *)(cf->data + 4) = cpu_to_be32(data[1]); |
| } |
| |
| stats->rx_bytes += cf->can_dlc; |
| stats->rx_packets++; |
| netif_receive_skb(skb); |
| |
| return 1; |
| } |
| |
| /** |
| * xcanfd_rx - Is called from CAN isr to complete the received |
| * frame processing |
| * @ndev: Pointer to net_device structure |
| * @frame_base: Register offset to the frame to be read |
| * |
| * This function is invoked from the CAN isr(poll) to process the Rx frames. It |
| * does minimal processing and invokes "netif_receive_skb" to complete further |
| * processing. |
| * Return: 1 on success and 0 on failure. |
| */ |
| static int xcanfd_rx(struct net_device *ndev, int frame_base) |
| { |
| struct xcan_priv *priv = netdev_priv(ndev); |
| struct net_device_stats *stats = &ndev->stats; |
| struct canfd_frame *cf; |
| struct sk_buff *skb; |
| u32 id_xcan, dlc, data[2] = {0, 0}, dwindex = 0, i, dw_offset; |
| |
| id_xcan = priv->read_reg(priv, XCAN_FRAME_ID_OFFSET(frame_base)); |
| dlc = priv->read_reg(priv, XCAN_FRAME_DLC_OFFSET(frame_base)); |
| if (dlc & XCAN_DLCR_EDL_MASK) |
| skb = alloc_canfd_skb(ndev, &cf); |
| else |
| skb = alloc_can_skb(ndev, (struct can_frame **)&cf); |
| |
| if (unlikely(!skb)) { |
| stats->rx_dropped++; |
| return 0; |
| } |
| |
| /* Change Xilinx CANFD data length format to socketCAN data |
| * format |
| */ |
| if (dlc & XCAN_DLCR_EDL_MASK) |
| cf->len = can_dlc2len((dlc & XCAN_DLCR_DLC_MASK) >> |
| XCAN_DLCR_DLC_SHIFT); |
| else |
| cf->len = get_can_dlc((dlc & XCAN_DLCR_DLC_MASK) >> |
| XCAN_DLCR_DLC_SHIFT); |
| |
| /* Change Xilinx CAN ID format to socketCAN ID format */ |
| if (id_xcan & XCAN_IDR_IDE_MASK) { |
| /* The received frame is an Extended format frame */ |
| cf->can_id = (id_xcan & XCAN_IDR_ID1_MASK) >> 3; |
| cf->can_id |= (id_xcan & XCAN_IDR_ID2_MASK) >> |
| XCAN_IDR_ID2_SHIFT; |
| cf->can_id |= CAN_EFF_FLAG; |
| if (id_xcan & XCAN_IDR_RTR_MASK) |
| cf->can_id |= CAN_RTR_FLAG; |
| } else { |
| /* The received frame is a standard format frame */ |
| cf->can_id = (id_xcan & XCAN_IDR_ID1_MASK) >> |
| XCAN_IDR_ID1_SHIFT; |
| if (!(dlc & XCAN_DLCR_EDL_MASK) && (id_xcan & |
| XCAN_IDR_SRR_MASK)) |
| cf->can_id |= CAN_RTR_FLAG; |
| } |
| |
| /* Check the frame received is FD or not*/ |
| if (dlc & XCAN_DLCR_EDL_MASK) { |
| for (i = 0; i < cf->len; i += 4) { |
| dw_offset = XCANFD_FRAME_DW_OFFSET(frame_base) + |
| (dwindex * XCANFD_DW_BYTES); |
| data[0] = priv->read_reg(priv, dw_offset); |
| *(__be32 *)(cf->data + i) = cpu_to_be32(data[0]); |
| dwindex++; |
| } |
| } else { |
| for (i = 0; i < cf->len; i += 4) { |
| dw_offset = XCANFD_FRAME_DW_OFFSET(frame_base); |
| data[0] = priv->read_reg(priv, dw_offset + i); |
| *(__be32 *)(cf->data + i) = cpu_to_be32(data[0]); |
| } |
| } |
| stats->rx_bytes += cf->len; |
| stats->rx_packets++; |
| netif_receive_skb(skb); |
| |
| return 1; |
| } |
| |
| /** |
| * xcan_current_error_state - Get current error state from HW |
| * @ndev: Pointer to net_device structure |
| * |
| * Checks the current CAN error state from the HW. Note that this |
| * only checks for ERROR_PASSIVE and ERROR_WARNING. |
| * |
| * Return: |
| * ERROR_PASSIVE or ERROR_WARNING if either is active, ERROR_ACTIVE |
| * otherwise. |
| */ |
| static enum can_state xcan_current_error_state(struct net_device *ndev) |
| { |
| struct xcan_priv *priv = netdev_priv(ndev); |
| u32 status = priv->read_reg(priv, XCAN_SR_OFFSET); |
| |
| if ((status & XCAN_SR_ESTAT_MASK) == XCAN_SR_ESTAT_MASK) |
| return CAN_STATE_ERROR_PASSIVE; |
| else if (status & XCAN_SR_ERRWRN_MASK) |
| return CAN_STATE_ERROR_WARNING; |
| else |
| return CAN_STATE_ERROR_ACTIVE; |
| } |
| |
| /** |
| * xcan_set_error_state - Set new CAN error state |
| * @ndev: Pointer to net_device structure |
| * @new_state: The new CAN state to be set |
| * @cf: Error frame to be populated or NULL |
| * |
| * Set new CAN error state for the device, updating statistics and |
| * populating the error frame if given. |
| */ |
| static void xcan_set_error_state(struct net_device *ndev, |
| enum can_state new_state, |
| struct can_frame *cf) |
| { |
| struct xcan_priv *priv = netdev_priv(ndev); |
| u32 ecr = priv->read_reg(priv, XCAN_ECR_OFFSET); |
| u32 txerr = ecr & XCAN_ECR_TEC_MASK; |
| u32 rxerr = (ecr & XCAN_ECR_REC_MASK) >> XCAN_ESR_REC_SHIFT; |
| enum can_state tx_state = txerr >= rxerr ? new_state : 0; |
| enum can_state rx_state = txerr <= rxerr ? new_state : 0; |
| |
| /* non-ERROR states are handled elsewhere */ |
| if (WARN_ON(new_state > CAN_STATE_ERROR_PASSIVE)) |
| return; |
| |
| can_change_state(ndev, cf, tx_state, rx_state); |
| |
| if (cf) { |
| cf->data[6] = txerr; |
| cf->data[7] = rxerr; |
| } |
| } |
| |
| /** |
| * xcan_update_error_state_after_rxtx - Update CAN error state after RX/TX |
| * @ndev: Pointer to net_device structure |
| * |
| * If the device is in a ERROR-WARNING or ERROR-PASSIVE state, check if |
| * the performed RX/TX has caused it to drop to a lesser state and set |
| * the interface state accordingly. |
| */ |
| static void xcan_update_error_state_after_rxtx(struct net_device *ndev) |
| { |
| struct xcan_priv *priv = netdev_priv(ndev); |
| enum can_state old_state = priv->can.state; |
| enum can_state new_state; |
| |
| /* changing error state due to successful frame RX/TX can only |
| * occur from these states |
| */ |
| if (old_state != CAN_STATE_ERROR_WARNING && |
| old_state != CAN_STATE_ERROR_PASSIVE) |
| return; |
| |
| new_state = xcan_current_error_state(ndev); |
| |
| if (new_state != old_state) { |
| struct sk_buff *skb; |
| struct can_frame *cf; |
| |
| skb = alloc_can_err_skb(ndev, &cf); |
| |
| xcan_set_error_state(ndev, new_state, skb ? cf : NULL); |
| |
| if (skb) { |
| struct net_device_stats *stats = &ndev->stats; |
| |
| stats->rx_packets++; |
| stats->rx_bytes += cf->can_dlc; |
| netif_rx(skb); |
| } |
| } |
| } |
| |
| /** |
| * xcan_err_interrupt - error frame Isr |
| * @ndev: net_device pointer |
| * @isr: interrupt status register value |
| * |
| * This is the CAN error interrupt and it will |
| * check the the type of error and forward the error |
| * frame to upper layers. |
| */ |
| static void xcan_err_interrupt(struct net_device *ndev, u32 isr) |
| { |
| struct xcan_priv *priv = netdev_priv(ndev); |
| struct net_device_stats *stats = &ndev->stats; |
| struct can_frame *cf; |
| struct sk_buff *skb; |
| u32 err_status; |
| |
| skb = alloc_can_err_skb(ndev, &cf); |
| |
| err_status = priv->read_reg(priv, XCAN_ESR_OFFSET); |
| priv->write_reg(priv, XCAN_ESR_OFFSET, err_status); |
| |
| if (isr & XCAN_IXR_BSOFF_MASK) { |
| priv->can.state = CAN_STATE_BUS_OFF; |
| priv->can.can_stats.bus_off++; |
| /* Leave device in Config Mode in bus-off state */ |
| priv->write_reg(priv, XCAN_SRR_OFFSET, XCAN_SRR_RESET_MASK); |
| can_bus_off(ndev); |
| if (skb) |
| cf->can_id |= CAN_ERR_BUSOFF; |
| } else { |
| enum can_state new_state = xcan_current_error_state(ndev); |
| |
| if (new_state != priv->can.state) |
| xcan_set_error_state(ndev, new_state, skb ? cf : NULL); |
| } |
| |
| /* Check for Arbitration lost interrupt */ |
| if (isr & XCAN_IXR_ARBLST_MASK) { |
| priv->can.can_stats.arbitration_lost++; |
| if (skb) { |
| cf->can_id |= CAN_ERR_LOSTARB; |
| cf->data[0] = CAN_ERR_LOSTARB_UNSPEC; |
| } |
| } |
| |
| /* Check for RX FIFO Overflow interrupt */ |
| if (isr & XCAN_IXR_RXOFLW_MASK) { |
| stats->rx_over_errors++; |
| stats->rx_errors++; |
| if (skb) { |
| cf->can_id |= CAN_ERR_CRTL; |
| cf->data[1] |= CAN_ERR_CRTL_RX_OVERFLOW; |
| } |
| } |
| |
| /* Check for RX Match Not Finished interrupt */ |
| if (isr & XCAN_IXR_RXMNF_MASK) { |
| stats->rx_dropped++; |
| stats->rx_errors++; |
| netdev_err(ndev, "RX match not finished, frame discarded\n"); |
| if (skb) { |
| cf->can_id |= CAN_ERR_CRTL; |
| cf->data[1] |= CAN_ERR_CRTL_UNSPEC; |
| } |
| } |
| |
| /* Check for error interrupt */ |
| if (isr & XCAN_IXR_ERROR_MASK) { |
| if (skb) |
| cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR; |
| |
| /* Check for Ack error interrupt */ |
| if (err_status & XCAN_ESR_ACKER_MASK) { |
| stats->tx_errors++; |
| if (skb) { |
| cf->can_id |= CAN_ERR_ACK; |
| cf->data[3] = CAN_ERR_PROT_LOC_ACK; |
| } |
| } |
| |
| /* Check for Bit error interrupt */ |
| if (err_status & XCAN_ESR_BERR_MASK) { |
| stats->tx_errors++; |
| if (skb) { |
| cf->can_id |= CAN_ERR_PROT; |
| cf->data[2] = CAN_ERR_PROT_BIT; |
| } |
| } |
| |
| /* Check for Stuff error interrupt */ |
| if (err_status & XCAN_ESR_STER_MASK) { |
| stats->rx_errors++; |
| if (skb) { |
| cf->can_id |= CAN_ERR_PROT; |
| cf->data[2] = CAN_ERR_PROT_STUFF; |
| } |
| } |
| |
| /* Check for Form error interrupt */ |
| if (err_status & XCAN_ESR_FMER_MASK) { |
| stats->rx_errors++; |
| if (skb) { |
| cf->can_id |= CAN_ERR_PROT; |
| cf->data[2] = CAN_ERR_PROT_FORM; |
| } |
| } |
| |
| /* Check for CRC error interrupt */ |
| if (err_status & XCAN_ESR_CRCER_MASK) { |
| stats->rx_errors++; |
| if (skb) { |
| cf->can_id |= CAN_ERR_PROT; |
| cf->data[3] = CAN_ERR_PROT_LOC_CRC_SEQ; |
| } |
| } |
| priv->can.can_stats.bus_error++; |
| } |
| |
| if (skb) { |
| stats->rx_packets++; |
| stats->rx_bytes += cf->can_dlc; |
| netif_rx(skb); |
| } |
| |
| netdev_dbg(ndev, "%s: error status register:0x%x\n", |
| __func__, priv->read_reg(priv, XCAN_ESR_OFFSET)); |
| } |
| |
| /** |
| * xcan_state_interrupt - It will check the state of the CAN device |
| * @ndev: net_device pointer |
| * @isr: interrupt status register value |
| * |
| * This will checks the state of the CAN device |
| * and puts the device into appropriate state. |
| */ |
| static void xcan_state_interrupt(struct net_device *ndev, u32 isr) |
| { |
| struct xcan_priv *priv = netdev_priv(ndev); |
| |
| /* Check for Sleep interrupt if set put CAN device in sleep state */ |
| if (isr & XCAN_IXR_SLP_MASK) |
| priv->can.state = CAN_STATE_SLEEPING; |
| |
| /* Check for Wake up interrupt if set put CAN device in Active state */ |
| if (isr & XCAN_IXR_WKUP_MASK) |
| priv->can.state = CAN_STATE_ERROR_ACTIVE; |
| } |
| |
| /** |
| * xcan_rx_fifo_get_next_frame - Get register offset of next RX frame |
| * @priv: Driver private data structure |
| * |
| * Return: Register offset of the next frame in RX FIFO. |
| */ |
| static int xcan_rx_fifo_get_next_frame(struct xcan_priv *priv) |
| { |
| int offset; |
| |
| if (priv->devtype.flags & XCAN_FLAG_RX_FIFO_MULTI) { |
| u32 fsr, mask; |
| |
| /* clear RXOK before the is-empty check so that any newly |
| * received frame will reassert it without a race |
| */ |
| priv->write_reg(priv, XCAN_ICR_OFFSET, XCAN_IXR_RXOK_MASK); |
| |
| fsr = priv->read_reg(priv, XCAN_FSR_OFFSET); |
| |
| /* check if RX FIFO is empty */ |
| if (priv->devtype.flags & XCAN_FLAG_CANFD_2) |
| mask = XCAN_2_FSR_FL_MASK; |
| else |
| mask = XCAN_FSR_FL_MASK; |
| |
| if (!(fsr & mask)) |
| return -ENOENT; |
| |
| if (priv->devtype.flags & XCAN_FLAG_CANFD_2) |
| offset = |
| XCAN_RXMSG_2_FRAME_OFFSET(fsr & XCAN_2_FSR_RI_MASK); |
| else |
| offset = |
| XCAN_RXMSG_FRAME_OFFSET(fsr & XCAN_FSR_RI_MASK); |
| |
| } else { |
| /* check if RX FIFO is empty */ |
| if (!(priv->read_reg(priv, XCAN_ISR_OFFSET) & |
| XCAN_IXR_RXNEMP_MASK)) |
| return -ENOENT; |
| |
| /* frames are read from a static offset */ |
| offset = XCAN_RXFIFO_OFFSET; |
| } |
| |
| return offset; |
| } |
| |
| /** |
| * xcan_rx_poll - Poll routine for rx packets (NAPI) |
| * @napi: napi structure pointer |
| * @quota: Max number of rx packets to be processed. |
| * |
| * This is the poll routine for rx part. |
| * It will process the packets maximux quota value. |
| * |
| * Return: number of packets received |
| */ |
| static int xcan_rx_poll(struct napi_struct *napi, int quota) |
| { |
| struct net_device *ndev = napi->dev; |
| struct xcan_priv *priv = netdev_priv(ndev); |
| u32 ier; |
| int work_done = 0; |
| int frame_offset; |
| |
| while ((frame_offset = xcan_rx_fifo_get_next_frame(priv)) >= 0 && |
| (work_done < quota)) { |
| if (xcan_rx_int_mask(priv) & XCAN_IXR_RXOK_MASK) |
| work_done += xcanfd_rx(ndev, frame_offset); |
| else |
| work_done += xcan_rx(ndev, frame_offset); |
| |
| if (priv->devtype.flags & XCAN_FLAG_RX_FIFO_MULTI) |
| /* increment read index */ |
| priv->write_reg(priv, XCAN_FSR_OFFSET, |
| XCAN_FSR_IRI_MASK); |
| else |
| /* clear rx-not-empty (will actually clear only if |
| * empty) |
| */ |
| priv->write_reg(priv, XCAN_ICR_OFFSET, |
| XCAN_IXR_RXNEMP_MASK); |
| } |
| |
| if (work_done) { |
| can_led_event(ndev, CAN_LED_EVENT_RX); |
| xcan_update_error_state_after_rxtx(ndev); |
| } |
| |
| if (work_done < quota) { |
| napi_complete_done(napi, work_done); |
| ier = priv->read_reg(priv, XCAN_IER_OFFSET); |
| ier |= xcan_rx_int_mask(priv); |
| priv->write_reg(priv, XCAN_IER_OFFSET, ier); |
| } |
| return work_done; |
| } |
| |
| /** |
| * xcan_tx_interrupt - Tx Done Isr |
| * @ndev: net_device pointer |
| * @isr: Interrupt status register value |
| */ |
| static void xcan_tx_interrupt(struct net_device *ndev, u32 isr) |
| { |
| struct xcan_priv *priv = netdev_priv(ndev); |
| struct net_device_stats *stats = &ndev->stats; |
| unsigned int frames_in_fifo; |
| int frames_sent = 1; /* TXOK => at least 1 frame was sent */ |
| unsigned long flags; |
| int retries = 0; |
| |
| /* Synchronize with xmit as we need to know the exact number |
| * of frames in the FIFO to stay in sync due to the TXFEMP |
| * handling. |
| * This also prevents a race between netif_wake_queue() and |
| * netif_stop_queue(). |
| */ |
| spin_lock_irqsave(&priv->tx_lock, flags); |
| |
| frames_in_fifo = priv->tx_head - priv->tx_tail; |
| |
| if (WARN_ON_ONCE(frames_in_fifo == 0)) { |
| /* clear TXOK anyway to avoid getting back here */ |
| priv->write_reg(priv, XCAN_ICR_OFFSET, XCAN_IXR_TXOK_MASK); |
| spin_unlock_irqrestore(&priv->tx_lock, flags); |
| return; |
| } |
| |
| /* Check if 2 frames were sent (TXOK only means that at least 1 |
| * frame was sent). |
| */ |
| if (frames_in_fifo > 1) { |
| WARN_ON(frames_in_fifo > priv->tx_max); |
| |
| /* Synchronize TXOK and isr so that after the loop: |
| * (1) isr variable is up-to-date at least up to TXOK clear |
| * time. This avoids us clearing a TXOK of a second frame |
| * but not noticing that the FIFO is now empty and thus |
| * marking only a single frame as sent. |
| * (2) No TXOK is left. Having one could mean leaving a |
| * stray TXOK as we might process the associated frame |
| * via TXFEMP handling as we read TXFEMP *after* TXOK |
| * clear to satisfy (1). |
| */ |
| while ((isr & XCAN_IXR_TXOK_MASK) && |
| !WARN_ON(++retries == 100)) { |
| priv->write_reg(priv, XCAN_ICR_OFFSET, |
| XCAN_IXR_TXOK_MASK); |
| isr = priv->read_reg(priv, XCAN_ISR_OFFSET); |
| } |
| |
| if (isr & XCAN_IXR_TXFEMP_MASK) { |
| /* nothing in FIFO anymore */ |
| frames_sent = frames_in_fifo; |
| } |
| } else { |
| /* single frame in fifo, just clear TXOK */ |
| priv->write_reg(priv, XCAN_ICR_OFFSET, XCAN_IXR_TXOK_MASK); |
| } |
| |
| while (frames_sent--) { |
| stats->tx_bytes += can_get_echo_skb(ndev, priv->tx_tail % |
| priv->tx_max); |
| priv->tx_tail++; |
| stats->tx_packets++; |
| } |
| |
| netif_wake_queue(ndev); |
| |
| spin_unlock_irqrestore(&priv->tx_lock, flags); |
| |
| can_led_event(ndev, CAN_LED_EVENT_TX); |
| xcan_update_error_state_after_rxtx(ndev); |
| } |
| |
| /** |
| * xcan_interrupt - CAN Isr |
| * @irq: irq number |
| * @dev_id: device id poniter |
| * |
| * This is the xilinx CAN Isr. It checks for the type of interrupt |
| * and invokes the corresponding ISR. |
| * |
| * Return: |
| * IRQ_NONE - If CAN device is in sleep mode, IRQ_HANDLED otherwise |
| */ |
| static irqreturn_t xcan_interrupt(int irq, void *dev_id) |
| { |
| struct net_device *ndev = (struct net_device *)dev_id; |
| struct xcan_priv *priv = netdev_priv(ndev); |
| u32 isr, ier; |
| u32 isr_errors; |
| u32 rx_int_mask = xcan_rx_int_mask(priv); |
| |
| /* Get the interrupt status from Xilinx CAN */ |
| isr = priv->read_reg(priv, XCAN_ISR_OFFSET); |
| if (!isr) |
| return IRQ_NONE; |
| |
| /* Check for the type of interrupt and Processing it */ |
| if (isr & (XCAN_IXR_SLP_MASK | XCAN_IXR_WKUP_MASK)) { |
| priv->write_reg(priv, XCAN_ICR_OFFSET, (XCAN_IXR_SLP_MASK | |
| XCAN_IXR_WKUP_MASK)); |
| xcan_state_interrupt(ndev, isr); |
| } |
| |
| /* Check for Tx interrupt and Processing it */ |
| if (isr & XCAN_IXR_TXOK_MASK) |
| xcan_tx_interrupt(ndev, isr); |
| |
| /* Check for the type of error interrupt and Processing it */ |
| isr_errors = isr & (XCAN_IXR_ERROR_MASK | XCAN_IXR_RXOFLW_MASK | |
| XCAN_IXR_BSOFF_MASK | XCAN_IXR_ARBLST_MASK | |
| XCAN_IXR_RXMNF_MASK); |
| if (isr_errors) { |
| priv->write_reg(priv, XCAN_ICR_OFFSET, isr_errors); |
| xcan_err_interrupt(ndev, isr); |
| } |
| |
| /* Check for the type of receive interrupt and Processing it */ |
| if (isr & rx_int_mask) { |
| ier = priv->read_reg(priv, XCAN_IER_OFFSET); |
| ier &= ~rx_int_mask; |
| priv->write_reg(priv, XCAN_IER_OFFSET, ier); |
| napi_schedule(&priv->napi); |
| } |
| return IRQ_HANDLED; |
| } |
| |
| /** |
| * xcan_chip_stop - Driver stop routine |
| * @ndev: Pointer to net_device structure |
| * |
| * This is the drivers stop routine. It will disable the |
| * interrupts and put the device into configuration mode. |
| */ |
| static void xcan_chip_stop(struct net_device *ndev) |
| { |
| struct xcan_priv *priv = netdev_priv(ndev); |
| |
| /* Disable interrupts and leave the can in configuration mode */ |
| set_reset_mode(ndev); |
| priv->can.state = CAN_STATE_STOPPED; |
| } |
| |
| /** |
| * xcan_open - Driver open routine |
| * @ndev: Pointer to net_device structure |
| * |
| * This is the driver open routine. |
| * Return: 0 on success and failure value on error |
| */ |
| static int xcan_open(struct net_device *ndev) |
| { |
| struct xcan_priv *priv = netdev_priv(ndev); |
| int ret; |
| |
| ret = pm_runtime_get_sync(priv->dev); |
| if (ret < 0) { |
| netdev_err(ndev, "%s: pm_runtime_get failed(%d)\n", |
| __func__, ret); |
| goto err; |
| } |
| |
| ret = request_irq(ndev->irq, xcan_interrupt, priv->irq_flags, |
| ndev->name, ndev); |
| if (ret < 0) { |
| netdev_err(ndev, "irq allocation for CAN failed\n"); |
| goto err; |
| } |
| |
| /* Set chip into reset mode */ |
| ret = set_reset_mode(ndev); |
| if (ret < 0) { |
| netdev_err(ndev, "mode resetting failed!\n"); |
| goto err_irq; |
| } |
| |
| /* Common open */ |
| ret = open_candev(ndev); |
| if (ret) |
| goto err_irq; |
| |
| ret = xcan_chip_start(ndev); |
| if (ret < 0) { |
| netdev_err(ndev, "xcan_chip_start failed!\n"); |
| goto err_candev; |
| } |
| |
| can_led_event(ndev, CAN_LED_EVENT_OPEN); |
| napi_enable(&priv->napi); |
| netif_start_queue(ndev); |
| |
| return 0; |
| |
| err_candev: |
| close_candev(ndev); |
| err_irq: |
| free_irq(ndev->irq, ndev); |
| err: |
| pm_runtime_put(priv->dev); |
| |
| return ret; |
| } |
| |
| /** |
| * xcan_close - Driver close routine |
| * @ndev: Pointer to net_device structure |
| * |
| * Return: 0 always |
| */ |
| static int xcan_close(struct net_device *ndev) |
| { |
| struct xcan_priv *priv = netdev_priv(ndev); |
| |
| netif_stop_queue(ndev); |
| napi_disable(&priv->napi); |
| xcan_chip_stop(ndev); |
| free_irq(ndev->irq, ndev); |
| close_candev(ndev); |
| |
| can_led_event(ndev, CAN_LED_EVENT_STOP); |
| pm_runtime_put(priv->dev); |
| |
| return 0; |
| } |
| |
| /** |
| * xcan_get_berr_counter - error counter routine |
| * @ndev: Pointer to net_device structure |
| * @bec: Pointer to can_berr_counter structure |
| * |
| * This is the driver error counter routine. |
| * Return: 0 on success and failure value on error |
| */ |
| static int xcan_get_berr_counter(const struct net_device *ndev, |
| struct can_berr_counter *bec) |
| { |
| struct xcan_priv *priv = netdev_priv(ndev); |
| int ret; |
| |
| ret = pm_runtime_get_sync(priv->dev); |
| if (ret < 0) { |
| netdev_err(ndev, "%s: pm_runtime_get failed(%d)\n", |
| __func__, ret); |
| pm_runtime_put(priv->dev); |
| return ret; |
| } |
| |
| bec->txerr = priv->read_reg(priv, XCAN_ECR_OFFSET) & XCAN_ECR_TEC_MASK; |
| bec->rxerr = ((priv->read_reg(priv, XCAN_ECR_OFFSET) & |
| XCAN_ECR_REC_MASK) >> XCAN_ESR_REC_SHIFT); |
| |
| pm_runtime_put(priv->dev); |
| |
| return 0; |
| } |
| |
| static const struct net_device_ops xcan_netdev_ops = { |
| .ndo_open = xcan_open, |
| .ndo_stop = xcan_close, |
| .ndo_start_xmit = xcan_start_xmit, |
| .ndo_change_mtu = can_change_mtu, |
| }; |
| |
| /** |
| * xcan_suspend - Suspend method for the driver |
| * @dev: Address of the device structure |
| * |
| * Put the driver into low power mode. |
| * Return: 0 on success and failure value on error |
| */ |
| static int __maybe_unused xcan_suspend(struct device *dev) |
| { |
| struct net_device *ndev = dev_get_drvdata(dev); |
| |
| if (netif_running(ndev)) { |
| netif_stop_queue(ndev); |
| netif_device_detach(ndev); |
| xcan_chip_stop(ndev); |
| } |
| |
| return pm_runtime_force_suspend(dev); |
| } |
| |
| /** |
| * xcan_resume - Resume from suspend |
| * @dev: Address of the device structure |
| * |
| * Resume operation after suspend. |
| * Return: 0 on success and failure value on error |
| */ |
| static int __maybe_unused xcan_resume(struct device *dev) |
| { |
| struct net_device *ndev = dev_get_drvdata(dev); |
| int ret; |
| |
| ret = pm_runtime_force_resume(dev); |
| if (ret) { |
| dev_err(dev, "pm_runtime_force_resume failed on resume\n"); |
| return ret; |
| } |
| |
| if (netif_running(ndev)) { |
| ret = xcan_chip_start(ndev); |
| if (ret) { |
| dev_err(dev, "xcan_chip_start failed on resume\n"); |
| return ret; |
| } |
| |
| netif_device_attach(ndev); |
| netif_start_queue(ndev); |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * xcan_runtime_suspend - Runtime suspend method for the driver |
| * @dev: Address of the device structure |
| * |
| * Put the driver into low power mode. |
| * Return: 0 always |
| */ |
| static int __maybe_unused xcan_runtime_suspend(struct device *dev) |
| { |
| struct net_device *ndev = dev_get_drvdata(dev); |
| struct xcan_priv *priv = netdev_priv(ndev); |
| |
| clk_disable_unprepare(priv->bus_clk); |
| clk_disable_unprepare(priv->can_clk); |
| |
| return 0; |
| } |
| |
| /** |
| * xcan_runtime_resume - Runtime resume from suspend |
| * @dev: Address of the device structure |
| * |
| * Resume operation after suspend. |
| * Return: 0 on success and failure value on error |
| */ |
| static int __maybe_unused xcan_runtime_resume(struct device *dev) |
| { |
| struct net_device *ndev = dev_get_drvdata(dev); |
| struct xcan_priv *priv = netdev_priv(ndev); |
| int ret; |
| |
| ret = clk_prepare_enable(priv->bus_clk); |
| if (ret) { |
| dev_err(dev, "Cannot enable clock.\n"); |
| return ret; |
| } |
| ret = clk_prepare_enable(priv->can_clk); |
| if (ret) { |
| dev_err(dev, "Cannot enable clock.\n"); |
| clk_disable_unprepare(priv->bus_clk); |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| static const struct dev_pm_ops xcan_dev_pm_ops = { |
| SET_SYSTEM_SLEEP_PM_OPS(xcan_suspend, xcan_resume) |
| SET_RUNTIME_PM_OPS(xcan_runtime_suspend, xcan_runtime_resume, NULL) |
| }; |
| |
| static const struct xcan_devtype_data xcan_zynq_data = { |
| .cantype = XZYNQ_CANPS, |
| .flags = XCAN_FLAG_TXFEMP, |
| .bittiming_const = &xcan_bittiming_const, |
| .btr_ts2_shift = XCAN_BTR_TS2_SHIFT, |
| .btr_sjw_shift = XCAN_BTR_SJW_SHIFT, |
| .bus_clk_name = "pclk", |
| }; |
| |
| static const struct xcan_devtype_data xcan_axi_data = { |
| .cantype = XAXI_CAN, |
| .bittiming_const = &xcan_bittiming_const, |
| .btr_ts2_shift = XCAN_BTR_TS2_SHIFT, |
| .btr_sjw_shift = XCAN_BTR_SJW_SHIFT, |
| .bus_clk_name = "s_axi_aclk", |
| }; |
| |
| static const struct xcan_devtype_data xcan_canfd_data = { |
| .cantype = XAXI_CANFD, |
| .flags = XCAN_FLAG_EXT_FILTERS | |
| XCAN_FLAG_RXMNF | |
| XCAN_FLAG_TX_MAILBOXES | |
| XCAN_FLAG_RX_FIFO_MULTI, |
| .bittiming_const = &xcan_bittiming_const_canfd, |
| .btr_ts2_shift = XCAN_BTR_TS2_SHIFT_CANFD, |
| .btr_sjw_shift = XCAN_BTR_SJW_SHIFT_CANFD, |
| .bus_clk_name = "s_axi_aclk", |
| }; |
| |
| static const struct xcan_devtype_data xcan_canfd2_data = { |
| .cantype = XAXI_CANFD_2_0, |
| .flags = XCAN_FLAG_EXT_FILTERS | |
| XCAN_FLAG_RXMNF | |
| XCAN_FLAG_TX_MAILBOXES | |
| XCAN_FLAG_CANFD_2 | |
| XCAN_FLAG_RX_FIFO_MULTI, |
| .bittiming_const = &xcan_bittiming_const_canfd2, |
| .btr_ts2_shift = XCAN_BTR_TS2_SHIFT_CANFD, |
| .btr_sjw_shift = XCAN_BTR_SJW_SHIFT_CANFD, |
| .bus_clk_name = "s_axi_aclk", |
| }; |
| |
| /* Match table for OF platform binding */ |
| static const struct of_device_id xcan_of_match[] = { |
| { .compatible = "xlnx,zynq-can-1.0", .data = &xcan_zynq_data }, |
| { .compatible = "xlnx,axi-can-1.00.a", .data = &xcan_axi_data }, |
| { .compatible = "xlnx,canfd-1.0", .data = &xcan_canfd_data }, |
| { .compatible = "xlnx,canfd-2.0", .data = &xcan_canfd2_data }, |
| { /* end of list */ }, |
| }; |
| MODULE_DEVICE_TABLE(of, xcan_of_match); |
| |
| /** |
| * xcan_probe - Platform registration call |
| * @pdev: Handle to the platform device structure |
| * |
| * This function does all the memory allocation and registration for the CAN |
| * device. |
| * |
| * Return: 0 on success and failure value on error |
| */ |
| static int xcan_probe(struct platform_device *pdev) |
| { |
| struct resource *res; /* IO mem resources */ |
| struct net_device *ndev; |
| struct xcan_priv *priv; |
| const struct of_device_id *of_id; |
| const struct xcan_devtype_data *devtype = &xcan_axi_data; |
| void __iomem *addr; |
| int ret; |
| int rx_max, tx_max; |
| int hw_tx_max, hw_rx_max; |
| const char *hw_tx_max_property; |
| |
| /* Get the virtual base address for the device */ |
| res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| addr = devm_ioremap_resource(&pdev->dev, res); |
| if (IS_ERR(addr)) { |
| ret = PTR_ERR(addr); |
| goto err; |
| } |
| |
| of_id = of_match_device(xcan_of_match, &pdev->dev); |
| if (of_id && of_id->data) |
| devtype = of_id->data; |
| |
| hw_tx_max_property = devtype->flags & XCAN_FLAG_TX_MAILBOXES ? |
| "tx-mailbox-count" : "tx-fifo-depth"; |
| |
| ret = of_property_read_u32(pdev->dev.of_node, hw_tx_max_property, |
| &hw_tx_max); |
| if (ret < 0) { |
| dev_err(&pdev->dev, "missing %s property\n", |
| hw_tx_max_property); |
| goto err; |
| } |
| |
| ret = of_property_read_u32(pdev->dev.of_node, "rx-fifo-depth", |
| &hw_rx_max); |
| if (ret < 0) { |
| dev_err(&pdev->dev, |
| "missing rx-fifo-depth property (mailbox mode is not supported)\n"); |
| goto err; |
| } |
| |
| /* With TX FIFO: |
| * |
| * There is no way to directly figure out how many frames have been |
| * sent when the TXOK interrupt is processed. If TXFEMP |
| * is supported, we can have 2 frames in the FIFO and use TXFEMP |
| * to determine if 1 or 2 frames have been sent. |
| * Theoretically we should be able to use TXFWMEMP to determine up |
| * to 3 frames, but it seems that after putting a second frame in the |
| * FIFO, with watermark at 2 frames, it can happen that TXFWMEMP (less |
| * than 2 frames in FIFO) is set anyway with no TXOK (a frame was |
| * sent), which is not a sensible state - possibly TXFWMEMP is not |
| * completely synchronized with the rest of the bits? |
| * |
| * With TX mailboxes: |
| * |
| * HW sends frames in CAN ID priority order. To preserve FIFO ordering |
| * we submit frames one at a time. |
| */ |
| if (!(devtype->flags & XCAN_FLAG_TX_MAILBOXES) && |
| (devtype->flags & XCAN_FLAG_TXFEMP)) |
| tx_max = min(hw_tx_max, 2); |
| else |
| tx_max = 1; |
| |
| rx_max = hw_rx_max; |
| |
| /* Create a CAN device instance */ |
| ndev = alloc_candev(sizeof(struct xcan_priv), tx_max); |
| if (!ndev) |
| return -ENOMEM; |
| |
| priv = netdev_priv(ndev); |
| priv->dev = &pdev->dev; |
| priv->can.bittiming_const = devtype->bittiming_const; |
| priv->can.do_set_mode = xcan_do_set_mode; |
| priv->can.do_get_berr_counter = xcan_get_berr_counter; |
| priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK | |
| CAN_CTRLMODE_BERR_REPORTING; |
| |
| if (devtype->cantype == XAXI_CANFD) |
| priv->can.data_bittiming_const = |
| &xcan_data_bittiming_const_canfd; |
| |
| if (devtype->cantype == XAXI_CANFD_2_0) |
| priv->can.data_bittiming_const = |
| &xcan_data_bittiming_const_canfd2; |
| |
| if (devtype->cantype == XAXI_CANFD || |
| devtype->cantype == XAXI_CANFD_2_0) |
| priv->can.ctrlmode_supported |= CAN_CTRLMODE_FD; |
| |
| priv->reg_base = addr; |
| priv->tx_max = tx_max; |
| priv->devtype = *devtype; |
| spin_lock_init(&priv->tx_lock); |
| |
| /* Get IRQ for the device */ |
| ndev->irq = platform_get_irq(pdev, 0); |
| ndev->flags |= IFF_ECHO; /* We support local echo */ |
| |
| platform_set_drvdata(pdev, ndev); |
| SET_NETDEV_DEV(ndev, &pdev->dev); |
| ndev->netdev_ops = &xcan_netdev_ops; |
| |
| /* Getting the CAN can_clk info */ |
| priv->can_clk = devm_clk_get(&pdev->dev, "can_clk"); |
| if (IS_ERR(priv->can_clk)) { |
| if (PTR_ERR(priv->can_clk) != -EPROBE_DEFER) |
| dev_err(&pdev->dev, "Device clock not found.\n"); |
| ret = PTR_ERR(priv->can_clk); |
| goto err_free; |
| } |
| |
| priv->bus_clk = devm_clk_get(&pdev->dev, devtype->bus_clk_name); |
| if (IS_ERR(priv->bus_clk)) { |
| dev_err(&pdev->dev, "bus clock not found\n"); |
| ret = PTR_ERR(priv->bus_clk); |
| goto err_free; |
| } |
| |
| priv->write_reg = xcan_write_reg_le; |
| priv->read_reg = xcan_read_reg_le; |
| |
| pm_runtime_enable(&pdev->dev); |
| ret = pm_runtime_get_sync(&pdev->dev); |
| if (ret < 0) { |
| netdev_err(ndev, "%s: pm_runtime_get failed(%d)\n", |
| __func__, ret); |
| goto err_disableclks; |
| } |
| |
| if (priv->read_reg(priv, XCAN_SR_OFFSET) != XCAN_SR_CONFIG_MASK) { |
| priv->write_reg = xcan_write_reg_be; |
| priv->read_reg = xcan_read_reg_be; |
| } |
| |
| priv->can.clock.freq = clk_get_rate(priv->can_clk); |
| |
| netif_napi_add(ndev, &priv->napi, xcan_rx_poll, rx_max); |
| |
| ret = register_candev(ndev); |
| if (ret) { |
| dev_err(&pdev->dev, "fail to register failed (err=%d)\n", ret); |
| goto err_disableclks; |
| } |
| |
| devm_can_led_init(ndev); |
| |
| pm_runtime_put(&pdev->dev); |
| |
| if (priv->devtype.flags & XCAN_FLAG_CANFD_2) { |
| priv->write_reg(priv, XCAN_AFR_2_ID_OFFSET, 0x00000000); |
| priv->write_reg(priv, XCAN_AFR_2_MASK_OFFSET, 0x00000000); |
| } |
| |
| netdev_dbg(ndev, "reg_base=0x%p irq=%d clock=%d, tx buffers: actual %d, using %d\n", |
| priv->reg_base, ndev->irq, priv->can.clock.freq, |
| hw_tx_max, priv->tx_max); |
| |
| return 0; |
| |
| err_disableclks: |
| pm_runtime_put(priv->dev); |
| pm_runtime_disable(&pdev->dev); |
| err_free: |
| free_candev(ndev); |
| err: |
| return ret; |
| } |
| |
| /** |
| * xcan_remove - Unregister the device after releasing the resources |
| * @pdev: Handle to the platform device structure |
| * |
| * This function frees all the resources allocated to the device. |
| * Return: 0 always |
| */ |
| static int xcan_remove(struct platform_device *pdev) |
| { |
| struct net_device *ndev = platform_get_drvdata(pdev); |
| struct xcan_priv *priv = netdev_priv(ndev); |
| |
| unregister_candev(ndev); |
| pm_runtime_disable(&pdev->dev); |
| netif_napi_del(&priv->napi); |
| free_candev(ndev); |
| |
| return 0; |
| } |
| |
| static struct platform_driver xcan_driver = { |
| .probe = xcan_probe, |
| .remove = xcan_remove, |
| .driver = { |
| .name = DRIVER_NAME, |
| .pm = &xcan_dev_pm_ops, |
| .of_match_table = xcan_of_match, |
| }, |
| }; |
| |
| module_platform_driver(xcan_driver); |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_AUTHOR("Xilinx Inc"); |
| MODULE_DESCRIPTION("Xilinx CAN interface"); |