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Date: Wed, 26 Sep 2018 12:40:35 -0500
From: Dan Murphy <dmurphy@...com>
To: <wg@...ndegger.com>, <mkl@...gutronix.de>, <davem@...emloft.net>
CC: <linux-can@...r.kernel.org>, <netdev@...r.kernel.org>,
<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] can: tcan4x5x: Add tcan4x5x driver to the kernel
bump
On 09/10/2018 03:12 PM, Dan Murphy wrote:
> Add the TCAN4x5x SPI CAN driver. This device
> uses the Bosch MCAN IP core along with a SPI
> interface map. The register and data are
> 32 bits wide.
>
> Signed-off-by: Dan Murphy <dmurphy@...com>
> ---
> drivers/net/can/spi/Kconfig | 5 +
> drivers/net/can/spi/Makefile | 1 +
> drivers/net/can/spi/tcan4x5x.c | 1206 ++++++++++++++++++++++++++++++++
> drivers/net/can/spi/tcan4x5x.h | 109 +++
> 4 files changed, 1321 insertions(+)
> create mode 100644 drivers/net/can/spi/tcan4x5x.c
> create mode 100644 drivers/net/can/spi/tcan4x5x.h
>
> diff --git a/drivers/net/can/spi/Kconfig b/drivers/net/can/spi/Kconfig
> index 8f2e0dd7b756..8cac6ce37506 100644
> --- a/drivers/net/can/spi/Kconfig
> +++ b/drivers/net/can/spi/Kconfig
> @@ -13,4 +13,9 @@ config CAN_MCP251X
> ---help---
> Driver for the Microchip MCP251x SPI CAN controllers.
>
> +config CAN_TCAN4X5X
> + tristate "Texas Instruments TCAN4X5X SPI CAN controllers"
> + depends on HAS_DMA
> + ---help---
> + Driver for the Texas Instruments TCAN4X5X SPI CAN controllers.
> endmenu
> diff --git a/drivers/net/can/spi/Makefile b/drivers/net/can/spi/Makefile
> index f59fa3731073..8ecaace7a920 100644
> --- a/drivers/net/can/spi/Makefile
> +++ b/drivers/net/can/spi/Makefile
> @@ -5,3 +5,4 @@
>
> obj-$(CONFIG_CAN_HI311X) += hi311x.o
> obj-$(CONFIG_CAN_MCP251X) += mcp251x.o
> +obj-$(CONFIG_CAN_TCAN4X5X) += tcan4x5x.o
> diff --git a/drivers/net/can/spi/tcan4x5x.c b/drivers/net/can/spi/tcan4x5x.c
> new file mode 100644
> index 000000000000..ca3753efe35a
> --- /dev/null
> +++ b/drivers/net/can/spi/tcan4x5x.c
> @@ -0,0 +1,1206 @@
> +// SPDX-License-Identifier: GPL-2.0
> +// SPI to CAN driver for the Texas Instruments TCAN4x5x
> +// Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
> +
> +#include <linux/can/core.h>
> +#include <linux/can/dev.h>
> +#include <linux/can/led.h>
> +#include <linux/clk.h>
> +#include <linux/completion.h>
> +#include <linux/delay.h>
> +#include <linux/device.h>
> +#include <linux/dma-mapping.h>
> +#include <linux/freezer.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/regmap.h>
> +#include <linux/slab.h>
> +#include <linux/spi/spi.h>
> +#include <linux/uaccess.h>
> +
> +#include <linux/regulator/consumer.h>
> +#include <linux/gpio/consumer.h>
> +
> +#include "tcan4x5x.h"
> +
> +#define DEVICE_NAME "tcan4x5x"
> +#define TCAN4X5X_EXT_CLK_DEF 40000000
> +
> +#define TCAN4X5X_CLEAR_ALL_INT 0xffffffff
> +#define TCAN4X5X_SET_ALL_INT 0xffffffff
> +
> +#define TCAN4X5X_TX_ECHO_SKB_MAX 1
> +#define TCAN4X5X_DATA_PKT_OFF 2
> +#define TCAN4X5X_WRITE_CMD (0x61 << 24)
> +#define TCAN4X5X_READ_CMD (0x41 << 24)
> +
> +#define TCAN4X5X_SID_SHIFT 18
> +#define TCAN4X5X_DLC_SHIFT 16
> +
> +#define TCAN4X5X_ESI_SHIFT 31
> +#define TCAN4X5X_XTD_SHIFT 30
> +#define TCAN4X5X_RTR_SHIFT 29
> +#define TCAN4X5X_FDF_SHIFT 21
> +#define TCAN4X5X_BRS_SHIFT 20
> +#define TCAN4X5X_DLC_SHIFT 16
> +
> +#define TCAN4X5X_ESI_MASK BIT(31)
> +#define TCAN4X5X_XTD_MASK BIT(30)
> +#define TCAN4X5X_RTR_MASK BIT(29)
> +
> +#define TCAN4X5X_DLC_MASK 0xf0000
> +#define TCAN4X5X_SW_RESET BIT(2)
> +
> +#define TCAN4X5X_MODE_SEL_MASK (BIT(7) | BIT(6))
> +#define TCAN4X5X_MODE_SLEEP 0x00
> +#define TCAN4X5X_MODE_STANDBY BIT(6)
> +#define TCAN4X5X_MODE_NORMAL BIT(7)
> +#define TCAN4X5X_MCAN_CONFIGURED BIT(5)
> +#define TCAN4X5X_WATCHDOG_EN BIT(3)
> +#define TCAN4X5X_WD_60_MS_TIMER 0
> +#define TCAN4X5X_WD_600_MS_TIMER BIT(28)
> +#define TCAN4X5X_WD_3_S_TIMER BIT(29)
> +#define TCAN4X5X_WD_6_S_TIMER (BIT(28) | BIT(29))
> +
> +/* Nominal Bit Timing & Prescaler Register */
> +#define TCAN4X5X_NSJW_SHIFT 25
> +#define TCAN4X5X_NBRP_SHIFT 16
> +#define TCAN4X5X_NTSEG1_SHIFT 8
> +
> +#define TCAN4X5X_TDCR_TDCO_SHIFT 8
> +
> +/* Data Bit Timing & Prescaler Register (DBTP) */
> +#define DBTP_TDC BIT(23)
> +#define DBTP_DBRP_SHIFT 16
> +#define DBTP_DBRP_MASK (0x1f << DBTP_DBRP_SHIFT)
> +#define DBTP_DTSEG1_SHIFT 8
> +#define DBTP_DTSEG1_MASK (0x1f << DBTP_DTSEG1_SHIFT)
> +#define DBTP_DTSEG2_SHIFT 4
> +#define DBTP_DTSEG2_MASK (0xf << DBTP_DTSEG2_SHIFT)
> +#define DBTP_DSJW_SHIFT 0
> +#define DBTP_DSJW_MASK (0xf << DBTP_DSJW_SHIFT)
> +
> +#define TCAN4x5x_QUEUE_LVL_MASK 0x1f
> +#define TCAN4x5x_QUEUE_IDX_SHIFT 16
> +#define TCAN4x5x_QUEUE_IDX_MASK 0x1f00
> +
> +#define TCAN4X5X_CANBUSNOM_INT_EN BIT(14)
> +
> +#define TCAN4X5X_NUM_TX_BUF 5
> +#define TCAN4X5X_TX_QUEUE_SHIFT 24
> +#define TCAN4X5X_TX_NDTB_SHIFT 16
> +#define TCAN4X5X_TX_BUF_START 0x324
> +
> +#define TCAN4X5X_NUM_RX_BUF 3
> +#define TCAN4X5X_RX_WATER_MARK 2
> +#define TCAN4X5X_RX_WATER_MARK_SHIFT 24
> +#define TCAN4X5X_RX_FIFO_SZ_SHIFT 16
> +#define TCAN4X5X_RX_BUF_START 0x4
> +
> +#define TCAN4X5X_RX_F1DS_SHIFT 4
> +#define TCAN4X5X_RX_RBDS_SHIFT 8
> +
> +#define TCAN4X5X_RX_FIFO0_MESSAGE BIT(0)
> +#define TCAN4X5X_RX_FIFO1_MESSAGE BIT(4)
> +#define TCAN4X5X_RX_BUFFER_MESSAGE BIT(19)
> +#define TCAN4X5X_RX_INDEX_MASK 0x3f00
> +#define TCAN4X5X_RX_INDEX_SHIFT 8
> +
> +#define TCAN4X5X_RX_ADDR_OFFSET 0x8000
> +#define TCAN4X5X_RX_BUF_ADDR_OFFSET 0x8100
> +#define TCAN4X5X_RX_ADDR_MASK 0xffff
> +
> +#define TCAN4X5X_ERR_PROTOCOL_MASK 0x7
> +#define TCAN4X5X_ERR_STUFERR 0x1
> +#define TCAN4X5X_ERR_FRMERR 0x2
> +#define TCAN4X5X_ERR_ACKERR 0x3
> +#define TCAN4X5X_ERR_BIT1ERR 0x4
> +#define TCAN4X5X_ERR_BIT0ERR 0x5
> +#define TCAN4X5X_ERR_CRCERR 0x6
> +
> +/* Interrupt bits */
> +#define TCAN4X5X_CANBUSTERMOPEN_INT_EN BIT(30)
> +#define TCAN4X5X_CANHCANL_INT_EN BIT(29)
> +#define TCAN4X5X_CANHBAT_INT_EN BIT(28)
> +#define TCAN4X5X_CANLGND_INT_EN BIT(27)
> +#define TCAN4X5X_CANBUSOPEN_INT_EN BIT(26)
> +#define TCAN4X5X_CANBUSGND_INT_EN BIT(25)
> +#define TCAN4X5X_CANBUSBAT_INT_EN BIT(24)
> +#define TCAN4X5X_UVSUP_INT_EN BIT(22)
> +#define TCAN4X5X_UVIO_INT_EN BIT(21)
> +#define TCAN4X5X_TSD_INT_EN BIT(19)
> +#define TCAN4X5X_ECCERR_INT_EN BIT(16)
> +#define TCAN4X5X_CANINT_INT_EN BIT(15)
> +#define TCAN4X5X_LWU_INT_EN BIT(14)
> +#define TCAN4X5X_CANSLNT_INT_EN BIT(10)
> +#define TCAN4X5X_CANDOM_INT_EN BIT(8)
> +#define TCAN4X5X_CANBUS_ERR_INT_EN BIT(5)
> +#define TCAN4X5X_BUS_FAULT BIT(4)
> +#define TCAN4X5X_MCAN_INT BIT(1)
> +#define TCAN4X5X_ENABLE_ALL_INT (TCAN4X5X_MCAN_INT | \
> + TCAN4X5X_BUS_FAULT | \
> + TCAN4X5X_CANBUS_ERR_INT_EN | \
> + TCAN4X5X_CANINT_INT_EN)
> +
> +/* MCAN Interrupt bits */
> +#define TCAN4X5X_MCAN_IR_ARA BIT(29)
> +#define TCAN4X5X_MCAN_IR_PED BIT(28)
> +#define TCAN4X5X_MCAN_IR_PEA BIT(27)
> +#define TCAN4X5X_MCAN_IR_WD BIT(26)
> +#define TCAN4X5X_MCAN_IR_BO BIT(25)
> +#define TCAN4X5X_MCAN_IR_EW BIT(24)
> +#define TCAN4X5X_MCAN_IR_EP BIT(23)
> +#define TCAN4X5X_MCAN_IR_ELO BIT(22)
> +#define TCAN4X5X_MCAN_IR_BEU BIT(21)
> +#define TCAN4X5X_MCAN_IR_BEC BIT(20)
> +#define TCAN4X5X_MCAN_IR_DRX BIT(19)
> +#define TCAN4X5X_MCAN_IR_TOO BIT(18)
> +#define TCAN4X5X_MCAN_IR_MRAF BIT(17)
> +#define TCAN4X5X_MCAN_IR_TSW BIT(16)
> +#define TCAN4X5X_MCAN_IR_TEFL BIT(15)
> +#define TCAN4X5X_MCAN_IR_TEFF BIT(14)
> +#define TCAN4X5X_MCAN_IR_TEFW BIT(13)
> +#define TCAN4X5X_MCAN_IR_TEFN BIT(12)
> +#define TCAN4X5X_MCAN_IR_TFE BIT(11)
> +#define TCAN4X5X_MCAN_IR_TCF BIT(10)
> +#define TCAN4X5X_MCAN_IR_TC BIT(9)
> +#define TCAN4X5X_MCAN_IR_HPM BIT(8)
> +#define TCAN4X5X_MCAN_IR_RF1L BIT(7)
> +#define TCAN4X5X_MCAN_IR_RF1F BIT(6)
> +#define TCAN4X5X_MCAN_IR_RF1W BIT(5)
> +#define TCAN4X5X_MCAN_IR_RF1N BIT(4)
> +#define TCAN4X5X_MCAN_IR_RF0L BIT(3)
> +#define TCAN4X5X_MCAN_IR_RF0F BIT(2)
> +#define TCAN4X5X_MCAN_IR_RF0W BIT(1)
> +#define TCAN4X5X_MCAN_IR_RF0N BIT(0)
> +#define TCAN4X5X_ENABLE_MCAN_INT (TCAN4X5X_MCAN_IR_TC | \
> + TCAN4X5X_MCAN_IR_RF0N | \
> + TCAN4X5X_MCAN_IR_RF1N | \
> + TCAN4X5X_MCAN_IR_RF0F | \
> + TCAN4X5X_MCAN_IR_RF1F)
> +
> +/* CCR bits */
> +#define TCAN4X5X_CCCR_NISO_BOSCH BIT(15)
> +#define TCAN4X5X_CCCR_TXP BIT(15)
> +#define TCAN4X5X_CCCR_EFBI BIT(13)
> +#define TCAN4X5X_CCCR_PXHD_DIS BIT(12)
> +#define TCAN4X5X_CCCR_BRSE BIT(9)
> +#define TCAN4X5X_CCCR_FDOE BIT(8)
> +#define TCAN4X5X_CCCR_TEST BIT(7)
> +#define TCAN4X5X_CCCR_DAR_DIS BIT(6)
> +#define TCAN4X5X_CCCR_MON BIT(5)
> +#define TCAN4X5X_CCCR_CSR BIT(4)
> +#define TCAN4X5X_CCCR_CSA BIT(3)
> +#define TCAN4X5X_CCCR_ASM BIT(2)
> +#define TCAN4X5X_CCCR_CCE BIT(1)
> +#define TCAN4X5X_CCCR_INIT BIT(0)
> +
> +#define TCAN4X5X_EINT0 BIT(0)
> +#define TCAN4X5X_EINT1 BIT(1)
> +
> +struct tcan4x5x_rx_regs {
> + u32 fifo_status_reg;
> + u32 fifo_config_reg;
> + u32 fifo_ack_reg;
> + u32 rx_buf_shift;
> +};
> +
> +struct tcan4x5x_rx_regs tcan4x5x_fifo_regs[] = {
> + { TCAN4X5X_MCAN_RXF0S, TCAN4X5X_MCAN_RXF0C, TCAN4X5X_MCAN_RXF0A, 0},
> + { TCAN4X5X_MCAN_RXF1S, TCAN4X5X_MCAN_RXF1C, TCAN4X5X_MCAN_RXF1A, 4},
> + { TCAN4X5X_MCAN_NDAT1, TCAN4X5X_MCAN_RXBC, TCAN4X5X_MCAN_NDAT1, 8},
> +};
> +
> +enum tcan4x5x_data_size {
> + TCAN4X5X_8_BYTE = 0,
> + TCAN4X5X_12_BYTE,
> + TCAN4X5X_16_BYTE,
> + TCAN4X5X_20_BYTE,
> + TCAN4X5X_24_BYTE,
> + TCAN4X5X_32_BYTE,
> + TCAN4X5X_48_BYTE,
> + TCAN4X5X_64_BYTE,
> +};
> +
> +static const struct can_bittiming_const tcan4x5x_bittiming_const = {
> + .name = DEVICE_NAME,
> + .tseg1_min = 2,
> + .tseg1_max = 31,
> + .tseg2_min = 2,
> + .tseg2_max = 16,
> + .sjw_max = 16,
> + .brp_min = 1,
> + .brp_max = 32,
> + .brp_inc = 1,
> +};
> +
> +static const struct can_bittiming_const tcan4x5x_data_bittiming_const = {
> + .name = DEVICE_NAME,
> + .tseg1_min = 1,
> + .tseg1_max = 32,
> + .tseg2_min = 1,
> + .tseg2_max = 16,
> + .sjw_max = 16,
> + .brp_min = 1,
> + .brp_max = 32,
> + .brp_inc = 1,
> +};
> +
> +static void tcan4x5x_clean(struct net_device *net)
> +{
> + struct tcan4x5x_priv *priv = netdev_priv(net);
> +
> + if (priv->tx_skb || priv->tx_len)
> + net->stats.tx_errors++;
> + if (priv->tx_skb)
> + dev_kfree_skb(priv->tx_skb);
> + if (priv->tx_len)
> + can_free_echo_skb(priv->net, 0);
> +
> + priv->tx_skb = NULL;
> + priv->tx_len = 0;
> +}
> +
> +static int regmap_spi_gather_write(void *context, const void *reg,
> + size_t reg_len, const void *val,
> + size_t val_len)
> +{
> + struct device *dev = context;
> + struct spi_device *spi = to_spi_device(dev);
> + u32 addr;
> + struct spi_message m;
> + struct spi_transfer t[2] = {{ .tx_buf = &addr, .len = 4, .cs_change = 0,},
> + { .tx_buf = val, .len = val_len, },};
> +
> + addr = TCAN4X5X_WRITE_CMD | (*((u16 *)reg) << 8) | val_len >> 2;
> +
> + spi_message_init(&m);
> + spi_message_add_tail(&t[0], &m);
> + spi_message_add_tail(&t[1], &m);
> +
> + return spi_sync(spi, &m);
> +}
> +
> +static int tcan4x5x_regmap_write(void *context, const void *data, size_t count)
> +{
> + u16 *reg = (u16 *)(data);
> + const u32 *val = data + 2;
> +
> + return regmap_spi_gather_write(context, reg, 2, val, count - 2);
> +}
> +
> +static int regmap_spi_async_write(void *context,
> + const void *reg, size_t reg_len,
> + const void *val, size_t val_len,
> + struct regmap_async *a)
> +{
> + return -ENOTSUPP;
> +}
> +
> +static struct regmap_async *regmap_spi_async_alloc(void)
> +{
> + return NULL;
> +}
> +
> +static int tcan4x5x_regmap_read(void *context,
> + const void *reg, size_t reg_size,
> + void *val, size_t val_size)
> +{
> + struct device *dev = context;
> + struct spi_device *spi = to_spi_device(dev);
> +
> + u32 addr = TCAN4X5X_READ_CMD | (*((u16 *)reg) << 8) | val_size >> 2;
> +
> + return spi_write_then_read(spi, &addr, 4, val, val_size);
> +}
> +
> +static struct regmap_bus tcan4x5x_bus = {
> + .write = tcan4x5x_regmap_write,
> + .gather_write = regmap_spi_gather_write,
> + .async_write = regmap_spi_async_write,
> + .async_alloc = regmap_spi_async_alloc,
> + .read = tcan4x5x_regmap_read,
> + .read_flag_mask = 0x00,
> + .reg_format_endian_default = REGMAP_ENDIAN_NATIVE,
> + .val_format_endian_default = REGMAP_ENDIAN_NATIVE,
> +};
> +
> +static uint8_t tcan4x5x_dlc_conv(uint8_t input)
> +{
> + const static u8 lookup[7] = {12, 16, 20, 24, 32, 48, 64};
> +
> + if (input < 9)
> + return input;
> +
> + if (input < 16)
> + return lookup[(unsigned int)(input - 9)];
> +
> + return 0;
> +}
> +
> +static uint8_t tcan4x5x_txrxesc_value(uint8_t input)
> +{
> + const u8 lookup[8] = {8, 12, 16, 20, 24, 32, 48, 64};
> + return lookup[(unsigned int)(input & 0x07)];
> +}
> +
> +static void tcan4x5x_hw_tx(struct tcan4x5x_priv *tcan4x5x)
> +{
> + u32 sid, eid, exide, rtr, brs, esi, fdf, xtd, data_len;
> + u32 mcan_address, mcan_tx_element_sz;
> + int queue_stat, queue_lvl, queue_idx;
> + struct canfd_frame *fd_frame;
> + struct can_frame *frame;
> + int tx_element_sz, i, temp;
> + canid_t frame_id;
> + u8 dlc_len;
> +
> + regmap_read(tcan4x5x->regmap, TCAN4X5X_MCAN_TXFQS, &queue_stat);
> + queue_lvl = queue_stat & TCAN4x5x_QUEUE_LVL_MASK;
> + queue_idx = (queue_stat & TCAN4x5x_QUEUE_IDX_MASK) >> TCAN4x5x_QUEUE_IDX_SHIFT;
> +
> + if (tcan4x5x->tx_skb->len == CAN_MTU) {
> + fd_frame = NULL;
> + frame = (struct can_frame *)tcan4x5x->tx_skb->data;
> + frame_id = frame->can_id;
> + dlc_len = frame->can_dlc;
> + data_len = ((dlc_len % 4) + dlc_len) / 4;
> + brs = 0;
> + } else if (tcan4x5x->tx_skb->len == CANFD_MTU) {
> + frame = NULL;
> + fd_frame = (struct canfd_frame *)tcan4x5x->tx_skb->data;
> + frame_id = fd_frame->can_id;
> + dlc_len = fd_frame->len;
> + data_len = ((dlc_len % 4) + dlc_len) / 4;
> + brs = fd_frame->flags & CANFD_BRS;
> + esi = fd_frame->flags & CANFD_ESI;
> + fdf = 1;
> + } else {
> + return;
> + }
> +
> + eid = frame_id & CAN_EFF_MASK;
> + rtr = (frame_id & CAN_RTR_FLAG) ? 1 : 0;
> +
> + exide = (frame_id & CAN_EFF_FLAG) ? 1 : 0;
> + if (exide) {
> + sid = frame_id & CAN_EFF_MASK;
> + xtd = 1;
> + } else {
> + sid = (frame_id & CAN_SFF_MASK) << TCAN4X5X_SID_SHIFT;
> + xtd = 0;
> + }
> +
> + regmap_read(tcan4x5x->regmap, TCAN4X5X_MCAN_TXBC, &mcan_address);
> +
> + mcan_address = (mcan_address & 0xffff) + TCAN4X5X_MRAM_START;
> + temp = (uint8_t)((mcan_address >> 24) & 0x3F);
> +
> + tx_element_sz = temp > 32 ? 32 : temp;
> + temp = (uint8_t)((mcan_address >> 16) & 0x3F);
> +
> + tx_element_sz += temp > 32 ? 32 : temp;
> + mcan_address += ((uint32_t)tx_element_sz * queue_idx);
> + regmap_read(tcan4x5x->regmap, TCAN4X5X_MCAN_TXESC, &mcan_tx_element_sz);
> + tx_element_sz = tcan4x5x_txrxesc_value(mcan_tx_element_sz & 0x07) + 8;
> + mcan_address += ((uint32_t)tx_element_sz * 0);
> +
> + tx_element_sz = (tcan4x5x_dlc_conv(dlc_len & 0x0F) + 8) >> 2;
> + if (tcan4x5x_dlc_conv(dlc_len & 0x0F) % 4)
> + tx_element_sz += 1;
> +
> + tcan4x5x->spi_tx_buf[0] = esi << TCAN4X5X_ESI_SHIFT |
> + xtd << TCAN4X5X_XTD_SHIFT |
> + rtr << TCAN4X5X_RTR_SHIFT | sid;
> +
> + tcan4x5x->spi_tx_buf[1] = fdf << TCAN4X5X_FDF_SHIFT |
> + brs << TCAN4X5X_BRS_SHIFT | dlc_len << TCAN4X5X_DLC_SHIFT;
> +
> + if (tcan4x5x->tx_skb->len == CAN_MTU)
> + memcpy(tcan4x5x->spi_tx_buf + TCAN4X5X_DATA_PKT_OFF,
> + frame->data, dlc_len);
> + else
> + memcpy(tcan4x5x->spi_tx_buf + TCAN4X5X_DATA_PKT_OFF,
> + fd_frame->data, dlc_len);
> +
> + for (i = dlc_len + 1; i < TCAN4X5X_BUF_LEN / 4; i++)
> + tcan4x5x->spi_tx_buf[i] = 0;
> +
> + regmap_bulk_write(tcan4x5x->regmap, mcan_address, tcan4x5x->spi_tx_buf,
> + TCAN4X5X_BUF_LEN);
> +
> + regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_TXBAR, (1 << (queue_idx)));
> +}
> +
> +int tcan4x5x_hw_rx(struct tcan4x5x_priv *tcan4x5x)
> +{
> + u32 queue_idx, fifo_idx, fifo_start_addr, rx_buf_size, msg_type;
> + u32 data_buffer[TCAN4X5X_BUF_LEN] = {0x0};
> + u32 rx_header[2] = {0x0};
> + struct tcan4x5x_rx_regs *buffer_regs;
> + struct canfd_frame *fd_frame;
> + int dlc_len, data_len;
> + struct sk_buff *skb;
> +
> + skb = alloc_canfd_skb(tcan4x5x->net, &fd_frame);
> + if (!skb) {
> + dev_err(&tcan4x5x->spi->dev, "cannot allocate RX skb\n");
> + tcan4x5x->net->stats.rx_dropped++;
> + return -ENOMEM;
> + }
> +
> + regmap_read(tcan4x5x->regmap, TCAN4X5X_MCAN_INT_FLAG, &msg_type);
> + if (msg_type & TCAN4X5X_RX_FIFO0_MESSAGE) {
> + buffer_regs = &tcan4x5x_fifo_regs[0];
> + } else if (msg_type & TCAN4X5X_RX_FIFO1_MESSAGE) {
> + buffer_regs = &tcan4x5x_fifo_regs[1];
> + } else if (msg_type & TCAN4X5X_RX_BUFFER_MESSAGE) {
> + buffer_regs = &tcan4x5x_fifo_regs[2];
> + } else {
> + buffer_regs = NULL;
> + return -EINVAL;
> + }
> +
> + rx_buf_size = TCAN4X5X_BUF_LEN;
> +
> + /* Determine which FIFO needs service */
> + regmap_read(tcan4x5x->regmap, buffer_regs->fifo_status_reg, &fifo_idx);
> + if (msg_type & TCAN4X5X_RX_BUFFER_MESSAGE)
> + queue_idx = fifo_idx - 1;
> + else
> + queue_idx = (TCAN4X5X_RX_INDEX_MASK & fifo_idx) >> TCAN4X5X_RX_INDEX_SHIFT;
> +
> + /* Calculate the FIFO start address to service */
> + regmap_read(tcan4x5x->regmap, buffer_regs->fifo_config_reg, &fifo_start_addr);
> + fifo_start_addr = (TCAN4X5X_RX_ADDR_MASK & fifo_start_addr);
> + if (msg_type & TCAN4X5X_RX_BUFFER_MESSAGE)
> + fifo_start_addr = fifo_start_addr + TCAN4X5X_RX_BUF_ADDR_OFFSET +
> + (rx_buf_size * queue_idx);
> + else
> + fifo_start_addr = fifo_start_addr + TCAN4X5X_RX_ADDR_OFFSET +
> + (rx_buf_size * queue_idx);
> +
> + regmap_bulk_read(tcan4x5x->regmap, fifo_start_addr, rx_header, 2);
> +
> + dlc_len = (rx_header[1] & TCAN4X5X_DLC_MASK) >> TCAN4X5X_DLC_SHIFT;
> + if (dlc_len <= 8)
> + data_len = dlc_len;
> + else
> + data_len = tcan4x5x_txrxesc_value(dlc_len);
> +
> + regmap_bulk_read(tcan4x5x->regmap, fifo_start_addr + 8,
> + data_buffer, data_len / 4);
> +
> + /* Acknowledge receipt of the data */
> + regmap_write(tcan4x5x->regmap, buffer_regs->fifo_ack_reg, queue_idx);
> +
> + if (rx_header[0] & TCAN4X5X_XTD_MASK) {
> + fd_frame->can_id = CAN_EFF_FLAG;
> + fd_frame->can_id |= (rx_header[0] & CAN_EFF_MASK);
> + } else {
> + fd_frame->can_id |= ((rx_header[0] >> TCAN4X5X_SID_SHIFT) &
> + CAN_SFF_MASK);
> + }
> +
> + if (rx_header[0] & TCAN4X5X_RTR_MASK)
> + fd_frame->can_id |= CAN_RTR_FLAG;
> +
> + if (rx_header[0] & TCAN4X5X_ESI_MASK) {
> + fd_frame->can_id |= CAN_ERR_FLAG;
> + fd_frame->flags |= CANFD_ESI;
> + netdev_dbg(tcan4x5x->net, "ESI Error\n");
> + }
> +
> + fd_frame->len = data_len;
> + memcpy(fd_frame->data, data_buffer, fd_frame->len);
> +
> + tcan4x5x->net->stats.rx_packets++;
> + tcan4x5x->net->stats.rx_bytes += fd_frame->len;
> +
> + can_led_event(tcan4x5x->net, CAN_LED_EVENT_RX);
> + netif_rx_ni(skb);
> +
> + return 0;
> +}
> +
> +static void tcan4x5x_sleep(struct spi_device *spi)
> +{
> + struct tcan4x5x_priv *tcan4x5x = spi_get_drvdata(spi);
> +
> + regmap_update_bits(tcan4x5x->regmap, TCAN4X5X_CONFIG,
> + TCAN4X5X_MODE_SEL_MASK, TCAN4X5X_MODE_STANDBY);
> +}
> +
> +static int tcan4x5x_reset(struct net_device *net)
> +{
> + struct tcan4x5x_priv *tcan4x5x = netdev_priv(net);
> +
> + if (tcan4x5x->reset_gpio) {
> + gpiod_set_value_cansleep(tcan4x5x->reset_gpio, 1);
> + udelay(10);
> + gpiod_set_value_cansleep(tcan4x5x->reset_gpio, 0);
> + } else {
> + regmap_write(tcan4x5x->regmap, TCAN4X5X_CONFIG,
> + TCAN4X5X_SW_RESET);
> + }
> +
> + return 0;
> +}
> +
> +static int tcan4x5x_power_enable(struct regulator *reg, int enable)
> +{
> + if (IS_ERR_OR_NULL(reg))
> + return 0;
> +
> + if (enable)
> + return regulator_enable(reg);
> + else
> + return regulator_disable(reg);
> +}
> +
> +static irqreturn_t tcan4x5x_can_ist(int irq, void *dev_id)
> +{
> + struct tcan4x5x_priv *tcan4x5x = dev_id;
> + struct spi_device *spi = tcan4x5x->spi;
> + struct net_device *net = tcan4x5x->net;
> + enum can_state new_state;
> + int intf, eflag, mcan_intf;
> +
> + mutex_lock(&tcan4x5x->tcan4x5x_lock);
> +
> + regmap_read(tcan4x5x->regmap, TCAN4X5X_INT_FLAGS, &intf);
> + if (intf & TCAN4X5X_MCAN_INT)
> + tcan4x5x_hw_rx(tcan4x5x);
> +
> + regmap_read(tcan4x5x->regmap, TCAN4X5X_MCAN_INT_FLAG, &mcan_intf);
> +
> + regmap_read(tcan4x5x->regmap, TCAN4X5X_STATUS, &eflag);
> + /* Update can state */
> + if (eflag & TCAN4X5X_MCAN_IR_BO)
> + new_state = CAN_STATE_BUS_OFF;
> + else if (eflag & TCAN4X5X_MCAN_IR_EP)
> + new_state = CAN_STATE_ERROR_PASSIVE;
> + else if (eflag & TCAN4X5X_MCAN_IR_EW)
> + new_state = CAN_STATE_ERROR_WARNING;
> + else
> + new_state = CAN_STATE_ERROR_ACTIVE;
> +
> + if (new_state != tcan4x5x->can.state) {
> + struct can_frame *cf;
> + struct sk_buff *skb;
> + enum can_state rx_state, tx_state;
> + u32 error_count;
> +
> + skb = alloc_can_err_skb(net, &cf);
> + if (!skb)
> + goto ist_out;
> +
> + regmap_read(tcan4x5x->regmap, TCAN4X5X_MCAN_ECR, &error_count);
> + cf->data[6] = error_count & 0xff;
> + cf->data[7] = error_count & 0x7f00 >> 8;
> + tx_state = cf->data[6] >= cf->data[7] ? new_state : 0;
> + rx_state = cf->data[6] <= cf->data[7] ? new_state : 0;
> + can_change_state(net, cf, tx_state, rx_state);
> + netif_rx_ni(skb);
> +
> + if (new_state == CAN_STATE_BUS_OFF) {
> + can_bus_off(net);
> + if (tcan4x5x->can.restart_ms == 0) {
> + tcan4x5x->force_quit = 1;
> + tcan4x5x_sleep(spi);
> + goto ist_out;
> + }
> + }
> + }
> +
> + /* Update bus errors */
> + if ((intf & TCAN4X5X_BUS_FAULT) &&
> + (tcan4x5x->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)) {
> + struct can_frame *cf;
> + struct sk_buff *skb;
> + u32 psr_err, error_count;
> +
> + /* Check for protocol errors */
> + regmap_read(tcan4x5x->regmap, TCAN4X5X_MCAN_PSR, &psr_err);
> + if (psr_err & TCAN4X5X_ERR_PROTOCOL_MASK) {
> + skb = alloc_can_err_skb(net, &cf);
> + if (!skb)
> + goto ist_out;
> +
> + cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
> + tcan4x5x->can.can_stats.bus_error++;
> + tcan4x5x->net->stats.rx_errors++;
> + if (psr_err & TCAN4X5X_ERR_BIT0ERR)
> + cf->data[2] |= CAN_ERR_PROT_BIT0;
> + else if (psr_err & TCAN4X5X_ERR_BIT1ERR)
> + cf->data[2] |= CAN_ERR_PROT_BIT1;
> + else if (psr_err & TCAN4X5X_ERR_FRMERR)
> + cf->data[2] |= CAN_ERR_PROT_FORM;
> + else if (psr_err & TCAN4X5X_ERR_STUFERR)
> + cf->data[2] |= CAN_ERR_PROT_STUFF;
> + else if (psr_err & TCAN4X5X_ERR_CRCERR)
> + cf->data[3] |= CAN_ERR_PROT_LOC_CRC_SEQ;
> + else if (psr_err & TCAN4X5X_ERR_ACKERR)
> + cf->data[3] |= CAN_ERR_PROT_LOC_ACK;
> +
> + regmap_read(tcan4x5x->regmap, TCAN4X5X_MCAN_ECR,
> + &error_count);
> + cf->data[6] = error_count & 0xff;
> + cf->data[7] = error_count & 0x7f00 >> 8;
> + netdev_dbg(tcan4x5x->net, "Bus Error\n");
> + netif_rx_ni(skb);
> + }
> + }
> +
> + if (mcan_intf & TCAN4X5X_MCAN_IR_TC) {
> + net->stats.tx_packets++;
> + net->stats.tx_bytes += tcan4x5x->tx_len - 1;
> + can_led_event(net, CAN_LED_EVENT_TX);
> + if (tcan4x5x->tx_len) {
> + can_get_echo_skb(net, 0);
> + tcan4x5x->tx_len = 0;
> + }
> + netif_wake_queue(net);
> + }
> +
> +ist_out:
> + regmap_write(tcan4x5x->regmap, TCAN4X5X_INT_FLAGS, TCAN4X5X_CLEAR_ALL_INT);
> + regmap_write(tcan4x5x->regmap, TCAN4X5X_STATUS, TCAN4X5X_CLEAR_ALL_INT);
> + regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_INT_FLAG,
> + TCAN4X5X_CLEAR_ALL_INT);
> +
> + mutex_unlock(&tcan4x5x->tcan4x5x_lock);
> + return IRQ_HANDLED;
> +}
> +
> +static int tcan4x5x_do_set_bittiming(struct net_device *net)
> +{
> + struct tcan4x5x_priv *priv = netdev_priv(net);
> + struct can_bittiming *bt = &priv->can.bittiming;
> + struct can_bittiming *dbt = &priv->can.data_bittiming;
> + u16 brp, sjw, tseg1, tseg2;
> + int ret;
> + u32 val;
> +
> + brp = bt->brp - 1;
> + sjw = bt->sjw - 1;
> + tseg1 = bt->prop_seg + bt->phase_seg1 - 1;
> + tseg2 = bt->phase_seg2 - 1;
> + val = (brp << TCAN4X5X_NBRP_SHIFT) | (sjw << TCAN4X5X_NSJW_SHIFT) |
> + (tseg1 << TCAN4X5X_NTSEG1_SHIFT) | tseg2;
> +
> + ret = regmap_write(priv->regmap, TCAN4X5X_MCAN_NBTP, val);
> + if (ret)
> + return -EIO;
> +
> + if (priv->can.ctrlmode & CAN_CTRLMODE_FD) {
> + val = 0;
> + brp = dbt->brp - 1;
> + sjw = dbt->sjw - 1;
> + tseg1 = dbt->prop_seg + dbt->phase_seg1 - 1;
> + tseg2 = dbt->phase_seg2 - 1;
> +
> + /* TDC is only needed for bitrates beyond 2.5 MBit/s.
> + * This is mentioned in the "Bit Time Requirements for CAN FD"
> + * paper presented at the International CAN Conference 2013
> + */
> + if (dbt->bitrate > 2500000) {
> + u32 tdco, ssp;
> +
> + /* Use the same value of secondary sampling point
> + * as the data sampling point
> + */
> + ssp = dbt->sample_point;
> +
> + /* Equation based on Bosch's M_CAN User Manual's
> + * Transmitter Delay Compensation Section
> + */
> + tdco = (priv->can.clock.freq / 1000) *
> + ssp / dbt->bitrate;
> +
> + /* Max valid TDCO value is 127 */
> + if (tdco > 127) {
> + netdev_warn(net, "TDCO value of %u is beyond maximum. Using maximum possible value\n",
> + tdco);
> + tdco = 127;
> + }
> +
> + val |= DBTP_TDC;
> + ret = regmap_write(priv->regmap, TCAN4X5X_MCAN_TDCR,
> + tdco << TCAN4X5X_TDCR_TDCO_SHIFT);
> + if (ret)
> + return -EIO;
> + }
> +
> + val |= (brp << DBTP_DBRP_SHIFT) |
> + (sjw << DBTP_DSJW_SHIFT) |
> + (tseg1 << DBTP_DTSEG1_SHIFT) |
> + (tseg2 << DBTP_DTSEG2_SHIFT);
> +
> + ret = regmap_write(priv->regmap, TCAN4X5X_MCAN_DBTP, val);
> + }
> +
> + return ret;
> +}
> +
> +static int tcan4x5x_setup(struct spi_device *spi)
> +{
> + struct tcan4x5x_priv *tcan4x5x = spi_get_drvdata(spi);
> + int start_reg = TCAN4X5X_MRAM_START;
> + int end_reg = start_reg + TCAN4X5X_MRAM_SIZE;
> + int ret;
> +
> + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_INT_REG,
> + TCAN4X5X_CLEAR_ALL_INT);
> + if (ret)
> + return -EIO;
> +
> + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_INT_EN,
> + TCAN4X5X_ENABLE_MCAN_INT);
> + if (ret)
> + return -EIO;
> +
> + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_CCCR,
> + TCAN4X5X_CCCR_INIT | TCAN4X5X_CCCR_CCE);
> + if (ret)
> + return -EIO;
> +
> + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_CCCR,
> + TCAN4X5X_CCCR_INIT | TCAN4X5X_CCCR_CCE |
> + TCAN4X5X_CCCR_FDOE | TCAN4X5X_CCCR_BRSE);
> + if (ret)
> + return -EIO;
> +
> + ret = tcan4x5x_do_set_bittiming(tcan4x5x->net);
> + if (ret)
> + return -EIO;
> +
> + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_TXESC,
> + TCAN4X5X_64_BYTE);
> + if (ret)
> + return -EIO;
> +
> + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_TXBC,
> + (TCAN4X5X_NUM_TX_BUF << TCAN4X5X_TX_QUEUE_SHIFT |
> + TCAN4X5X_TX_BUF_START));
> + if (ret)
> + return -EIO;
> +
> + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_RXF0C,
> + (TCAN4X5X_RX_WATER_MARK << TCAN4X5X_RX_WATER_MARK_SHIFT |
> + TCAN4X5X_NUM_RX_BUF << TCAN4X5X_RX_FIFO_SZ_SHIFT |
> + TCAN4X5X_RX_BUF_START));
> + if (ret)
> + return -EIO;
> +
> + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_RXESC,
> + (TCAN4X5X_64_BYTE << TCAN4X5X_RX_RBDS_SHIFT |
> + TCAN4X5X_64_BYTE << TCAN4X5X_RX_F1DS_SHIFT |
> + TCAN4X5X_64_BYTE));
> + if (ret)
> + return -EIO;
> +
> + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_TXBTIE,
> + TCAN4X5X_SET_ALL_INT);
> + if (ret)
> + return -EIO;
> +
> +
> + ret = regmap_update_bits(tcan4x5x->regmap, TCAN4X5X_CONFIG,
> + TCAN4X5X_MODE_SEL_MASK, TCAN4X5X_MODE_NORMAL);
> + if (ret)
> + return -EIO;
> +
> + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_ILE, TCAN4X5X_EINT0);
> + if (ret)
> + return -EIO;
> +
> + /* Zero out the MCAN buffers */
> + while (start_reg < end_reg) {
> + regmap_write(tcan4x5x->regmap, start_reg, 0);
> + start_reg += 4;
> + }
> +
> + return ret;
> +}
> +
> +static void tcan4x5x_tx_work_handler(struct work_struct *ws)
> +{
> + struct tcan4x5x_priv *tcan4x5x = container_of(ws, struct tcan4x5x_priv,
> + tx_work);
> + struct net_device *net = tcan4x5x->net;
> + struct can_frame *frame;
> +
> + mutex_lock(&tcan4x5x->tcan4x5x_lock);
> + if (tcan4x5x->tx_skb) {
> + if (tcan4x5x->can.state == CAN_STATE_BUS_OFF) {
> + tcan4x5x_clean(net);
> + } else {
> + frame = (struct can_frame *)tcan4x5x->tx_skb->data;
> + tcan4x5x_hw_tx(tcan4x5x);
> + tcan4x5x->tx_len = 1 + frame->can_dlc;
> + can_put_echo_skb(tcan4x5x->tx_skb, net, 0);
> + tcan4x5x->tx_skb = NULL;
> + }
> + }
> + mutex_unlock(&tcan4x5x->tcan4x5x_lock);
> +}
> +
> +static void tcan4x5x_restart_work_handler(struct work_struct *ws)
> +{
> + struct tcan4x5x_priv *tcan4x5x = container_of(ws, struct tcan4x5x_priv,
> + restart_work);
> + struct spi_device *spi = tcan4x5x->spi;
> + struct net_device *net = tcan4x5x->net;
> +
> + mutex_lock(&tcan4x5x->tcan4x5x_lock);
> + if (tcan4x5x->after_suspend) {
> + tcan4x5x_reset(net);
> + tcan4x5x_setup(spi);
> + if (tcan4x5x->after_suspend & AFTER_SUSPEND_RESTART) {
> + tcan4x5x_setup(spi);
> + } else if (tcan4x5x->after_suspend & AFTER_SUSPEND_UP) {
> + netif_device_attach(net);
> + tcan4x5x_clean(net);
> + tcan4x5x_setup(spi);
> + netif_wake_queue(net);
> + } else {
> + tcan4x5x_sleep(spi);
> + }
> + tcan4x5x->after_suspend = 0;
> + tcan4x5x->force_quit = 0;
> + }
> +
> + if (tcan4x5x->restart_tx) {
> + tcan4x5x->restart_tx = 0;
> + tcan4x5x_reset(net);
> + tcan4x5x_clean(net);
> + tcan4x5x_setup(spi);
> + netif_wake_queue(net);
> + }
> + mutex_unlock(&tcan4x5x->tcan4x5x_lock);
> +}
> +
> +static int tcan4x5x_open(struct net_device *net)
> +{
> + struct tcan4x5x_priv *priv = netdev_priv(net);
> + struct spi_device *spi = priv->spi;
> + unsigned long flags = IRQF_ONESHOT | IRQF_TRIGGER_LOW;
> + int ret;
> +
> + ret = open_candev(net);
> + if (ret)
> + return ret;
> +
> + mutex_lock(&priv->tcan4x5x_lock);
> + tcan4x5x_power_enable(priv->power, 1);
> +
> + priv->force_quit = 0;
> + priv->tx_skb = NULL;
> + priv->tx_len = 0;
> +
> + ret = request_threaded_irq(priv->irq, NULL, tcan4x5x_can_ist,
> + flags, DEVICE_NAME, priv);
> + if (ret) {
> + dev_err(&spi->dev, "failed to acquire irq %d %i\n",
> + priv->irq, ret);
> + goto out_close;
> + }
> +
> + priv->wq = alloc_workqueue("tcan4x5x_wq", WQ_FREEZABLE | WQ_MEM_RECLAIM,
> + 0);
> + if (!priv->wq) {
> + ret = -ENOMEM;
> + goto out_free_irq;
> + }
> +
> + INIT_WORK(&priv->tx_work, tcan4x5x_tx_work_handler);
> + INIT_WORK(&priv->restart_work, tcan4x5x_restart_work_handler);
> +
> + priv->spi_tx_buf = devm_kzalloc(&spi->dev, TCAN4X5X_BUF_LEN,
> + GFP_KERNEL);
> + if (!priv->spi_tx_buf) {
> + ret = -ENOMEM;
> + goto out_free_wq;
> + }
> +
> + priv->spi_rx_buf = devm_kzalloc(&spi->dev, TCAN4X5X_BUF_LEN,
> + GFP_KERNEL);
> + if (!priv->spi_rx_buf) {
> + ret = -ENOMEM;
> + goto out_free_wq;
> + }
> +
> + if (priv->wake_gpio)
> + gpiod_set_value_cansleep(priv->wake_gpio, 1);
> +
> + ret = tcan4x5x_reset(net);
> + if (ret)
> + goto out_free_wq;
> +
> + ret = tcan4x5x_setup(spi);
> + if (ret)
> + goto out_free_wq;
> +
> + can_led_event(net, CAN_LED_EVENT_OPEN);
> + netif_wake_queue(net);
> + mutex_unlock(&priv->tcan4x5x_lock);
> +
> + return 0;
> +
> + out_free_wq:
> + destroy_workqueue(priv->wq);
> + out_free_irq:
> + free_irq(priv->irq, priv);
> + tcan4x5x_sleep(spi);
> + out_close:
> + tcan4x5x_power_enable(priv->power, 0);
> + close_candev(net);
> + mutex_unlock(&priv->tcan4x5x_lock);
> + return ret;
> +}
> +
> +static int tcan4x5x_stop(struct net_device *net)
> +{
> + struct tcan4x5x_priv *priv = netdev_priv(net);
> + struct spi_device *spi = priv->spi;
> +
> + close_candev(net);
> +
> + priv->force_quit = 1;
> + free_irq(priv->irq, priv);
> + destroy_workqueue(priv->wq);
> + priv->wq = NULL;
> +
> + mutex_lock(&priv->tcan4x5x_lock);
> +
> + priv->can.state = CAN_STATE_STOPPED;
> + tcan4x5x_sleep(spi);
> + tcan4x5x_power_enable(priv->power, 0);
> +
> + mutex_unlock(&priv->tcan4x5x_lock);
> +
> + can_led_event(net, CAN_LED_EVENT_STOP);
> +
> + return 0;
> +}
> +
> +static netdev_tx_t tcan4x5x_hard_start_xmit(struct sk_buff *skb,
> + struct net_device *net)
> +{
> + struct tcan4x5x_priv *priv = netdev_priv(net);
> + struct spi_device *spi = priv->spi;
> +
> + if (priv->tx_skb || priv->tx_len) {
> + dev_warn(&spi->dev, "hard_xmit called while tx busy\n");
> + return NETDEV_TX_BUSY;
> + }
> +
> + if (can_dropped_invalid_skb(net, skb))
> + return NETDEV_TX_OK;
> +
> + netif_stop_queue(net);
> + priv->tx_skb = skb;
> + queue_work(priv->wq, &priv->tx_work);
> +
> + return NETDEV_TX_OK;
> +}
> +
> +static int tcan4x5x_do_set_mode(struct net_device *net, enum can_mode mode)
> +{
> + struct tcan4x5x_priv *priv = netdev_priv(net);
> +
> + switch (mode) {
> + case CAN_MODE_START:
> + tcan4x5x_clean(net);
> + priv->can.state = CAN_STATE_ERROR_ACTIVE;
> + priv->restart_tx = 1;
> + queue_work(priv->wq, &priv->restart_work);
> + break;
> + default:
> + return -EOPNOTSUPP;
> + }
> +
> + return 0;
> +}
> +
> +static const struct net_device_ops tcan4x5x_netdev_ops = {
> + .ndo_open = tcan4x5x_open,
> + .ndo_stop = tcan4x5x_stop,
> + .ndo_start_xmit = tcan4x5x_hard_start_xmit,
> + .ndo_change_mtu = can_change_mtu,
> +};
> +
> +static int tcan4x5x_parse_config(struct tcan4x5x_priv *tcan4x5x)
> +{
> + tcan4x5x->reset_gpio = devm_gpiod_get_optional(&tcan4x5x->spi->dev,
> + "reset", GPIOD_OUT_LOW);
> + if (IS_ERR(tcan4x5x->reset_gpio))
> + tcan4x5x->reset_gpio = NULL;
> +
> + tcan4x5x->wake_gpio = devm_gpiod_get_optional(&tcan4x5x->spi->dev,
> + "wake-up", GPIOD_OUT_LOW);
> + if (IS_ERR(tcan4x5x->wake_gpio))
> + tcan4x5x->wake_gpio = NULL;
> +
> + tcan4x5x->interrupt_gpio = devm_gpiod_get(&tcan4x5x->spi->dev,
> + "data-ready", GPIOD_IN);
> + if (IS_ERR(tcan4x5x->interrupt_gpio)) {
> + dev_err(&tcan4x5x->spi->dev, "data-ready gpio not defined\n");
> + return -EINVAL;
> + }
> +
> + tcan4x5x->irq = gpiod_to_irq(tcan4x5x->interrupt_gpio);
> +
> + tcan4x5x->power = devm_regulator_get_optional(&tcan4x5x->spi->dev,
> + "vsup");
> + if (PTR_ERR(tcan4x5x->power) == -EPROBE_DEFER)
> + return -EPROBE_DEFER;
> +
> + return 0;
> +}
> +
> +static const struct regmap_config tcan4x5x_regmap = {
> + .reg_bits = 16,
> + .val_bits = 32,
> + .cache_type = REGCACHE_NONE,
> + .max_register = TCAN4X5X_MAX_REGISTER,
> +};
> +
> +static int tcan4x5x_can_probe(struct spi_device *spi)
> +{
> + struct net_device *net;
> + struct tcan4x5x_priv *priv;
> + struct clk *clk;
> + int freq, ret;
> +
> + clk = devm_clk_get(&spi->dev, NULL);
> + if (IS_ERR(clk)) {
> + dev_err(&spi->dev, "no CAN clock source defined\n");
> + freq = TCAN4X5X_EXT_CLK_DEF;
> + } else {
> + freq = clk_get_rate(clk);
> + }
> +
> + /* Sanity check */
> + if (freq < 20000000 || freq > TCAN4X5X_EXT_CLK_DEF)
> + return -ERANGE;
> +
> + /* Allocate can/net device */
> + net = alloc_candev(sizeof(*priv), TCAN4X5X_TX_ECHO_SKB_MAX);
> + if (!net)
> + return -ENOMEM;
> +
> + if (!IS_ERR(clk)) {
> + ret = clk_prepare_enable(clk);
> + if (ret)
> + goto out_free;
> + }
> +
> + net->netdev_ops = &tcan4x5x_netdev_ops;
> + net->flags |= IFF_ECHO;
> + net->mtu = CANFD_MTU;
> +
> + priv = netdev_priv(net);
> + priv->can.bittiming_const = &tcan4x5x_bittiming_const;
> + priv->can.data_bittiming_const = &tcan4x5x_data_bittiming_const;
> + priv->can.do_set_mode = tcan4x5x_do_set_mode;
> + priv->can.clock.freq = freq;
> + priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK |
> + CAN_CTRLMODE_LISTENONLY |
> + CAN_CTRLMODE_BERR_REPORTING |
> + CAN_CTRLMODE_FD |
> + CAN_CTRLMODE_FD_NON_ISO;
> + priv->net = net;
> + priv->spi = spi;
> + priv->clk = clk;
> + spi_set_drvdata(spi, priv);
> +
> + ret = tcan4x5x_parse_config(priv);
> + if (ret)
> + goto out_clk;
> +
> + /* Configure the SPI bus */
> + spi->bits_per_word = 32;
> + ret = spi_setup(spi);
> + if (ret)
> + goto out_clk;
> +
> + mutex_init(&priv->tcan4x5x_lock);
> +
> + priv->regmap = devm_regmap_init(&spi->dev, &tcan4x5x_bus,
> + &spi->dev, &tcan4x5x_regmap);
> +
> + SET_NETDEV_DEV(net, &spi->dev);
> + ret = register_candev(net);
> + if (ret)
> + goto error_probe;
> +
> + devm_can_led_init(net);
> +
> + netdev_info(net, "TCAN4X5X successfully initialized.\n");
> + return 0;
> +
> +error_probe:
> + tcan4x5x_power_enable(priv->power, 0);
> +out_clk:
> + if (!IS_ERR(clk))
> + clk_disable_unprepare(clk);
> +out_free:
> + free_candev(net);
> + dev_err(&spi->dev, "Probe failed, err=%d\n", -ret);
> + return ret;
> +}
> +
> +static int tcan4x5x_can_remove(struct spi_device *spi)
> +{
> + struct tcan4x5x_priv *priv = spi_get_drvdata(spi);
> + struct net_device *net = priv->net;
> +
> + unregister_candev(net);
> +
> + tcan4x5x_power_enable(priv->power, 0);
> +
> + if (!IS_ERR(priv->clk))
> + clk_disable_unprepare(priv->clk);
> +
> + free_candev(net);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id tcan4x5x_of_match[] = {
> + { .compatible = "ti,tcan4x5x", },
> + { }
> +};
> +MODULE_DEVICE_TABLE(of, tcan4x5x_of_match);
> +
> +static const struct spi_device_id tcan4x5x_id_table[] = {
> + {
> + .name = "tcan4x5x",
> + .driver_data = 0,
> + },
> + { }
> +};
> +MODULE_DEVICE_TABLE(spi, tcan4x5x_id_table);
> +
> +static struct spi_driver tcan4x5x_can_driver = {
> + .driver = {
> + .name = DEVICE_NAME,
> + .of_match_table = tcan4x5x_of_match,
> + .pm = NULL,
> + },
> + .id_table = tcan4x5x_id_table,
> + .probe = tcan4x5x_can_probe,
> + .remove = tcan4x5x_can_remove,
> +};
> +module_spi_driver(tcan4x5x_can_driver);
> +
> +MODULE_AUTHOR("Dan Murphy <dmurphy@...com>");
> +MODULE_DESCRIPTION("Texas Instruments TCAN4x5x CAN driver");
> +MODULE_LICENSE("GPL v2");
> diff --git a/drivers/net/can/spi/tcan4x5x.h b/drivers/net/can/spi/tcan4x5x.h
> new file mode 100644
> index 000000000000..5e14ba571d49
> --- /dev/null
> +++ b/drivers/net/can/spi/tcan4x5x.h
> @@ -0,0 +1,109 @@
> +// SPDX-License-Identifier: GPL-2.0
> +// SPI to CAN driver for the Texas Instruments TCA4x5x
> +// Flash driver chip family
> +// Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
> +
> +#define TCAN4X5X_DEV_ID0 0x00
> +#define TCAN4X5X_DEV_ID1 0x04
> +#define TCAN4X5X_REV 0x08
> +#define TCAN4X5X_STATUS 0x0C
> +#define TCAN4X5X_ERROR_STATUS 0x10
> +#define TCAN4X5X_CONTROL 0x14
> +
> +#define TCAN4X5X_CONFIG 0x800
> +#define TCAN4X5X_TS_PRESCALE 0x804
> +#define TCAN4X5X_TEST_REG 0x808
> +#define TCAN4X5X_INT_FLAGS 0x820
> +#define TCAN4X5X_MCAN_INT_REG 0x824
> +#define TCAN4X5X_INT_EN 0x830
> +
> +#define TCAN4X5X_MCAN_CREL 0x1000
> +#define TCAN4X5X_MCAN_ENDN 0x1004
> +#define TCAN4X5X_MCAN_CUST 0x1008
> +#define TCAN4X5X_MCAN_DBTP 0x100C
> +#define TCAN4X5X_MCAN_TEST 0x1010
> +#define TCAN4X5X_MCAN_RWD 0x1014
> +#define TCAN4X5X_MCAN_CCCR 0x1018
> +#define TCAN4X5X_MCAN_NBTP 0x101C
> +#define TCAN4X5X_MCAN_TSCC 0x1020
> +#define TCAN4X5X_MCAN_TSCV 0x1024
> +#define TCAN4X5X_MCAN_TOCC 0x1028
> +#define TCAN4X5X_MCAN_TOCV 0x102C
> +#define TCAN4X5X_MCAN_ECR 0x1040
> +#define TCAN4X5X_MCAN_PSR 0x1044
> +#define TCAN4X5X_MCAN_TDCR 0x1048
> +#define TCAN4X5X_MCAN_INT_FLAG 0x1050
> +#define TCAN4X5X_MCAN_INT_EN 0x1054
> +#define TCAN4X5X_MCAN_ILS 0x1058
> +#define TCAN4X5X_MCAN_ILE 0x105C
> +#define TCAN4X5X_MCAN_GFC 0x1080
> +#define TCAN4X5X_MCAN_SIDFC 0x1084
> +#define TCAN4X5X_MCAN_XIDFC 0x1088
> +#define TCAN4X5X_MCAN_XIDAM 0x1090
> +#define TCAN4X5X_MCAN_HPMS 0x1094
> +#define TCAN4X5X_MCAN_NDAT1 0x1098
> +#define TCAN4X5X_MCAN_NDAT2 0x109C
> +#define TCAN4X5X_MCAN_RXF0C 0x10A0
> +#define TCAN4X5X_MCAN_RXF0S 0x10A4
> +#define TCAN4X5X_MCAN_RXF0A 0x10A8
> +#define TCAN4X5X_MCAN_RXBC 0x10AC
> +#define TCAN4X5X_MCAN_RXF1C 0x10B0
> +#define TCAN4X5X_MCAN_RXF1S 0x10B4
> +#define TCAN4X5X_MCAN_RXF1A 0x10B8
> +#define TCAN4X5X_MCAN_RXESC 0x10BC
> +#define TCAN4X5X_MCAN_TXBC 0x10C0
> +#define TCAN4X5X_MCAN_TXFQS 0x10C4
> +#define TCAN4X5X_MCAN_TXESC 0x10C8
> +#define TCAN4X5X_MCAN_TXBRP 0x10CC
> +#define TCAN4X5X_MCAN_TXBAR 0x10D0
> +#define TCAN4X5X_MCAN_TXBCR 0x10D4
> +#define TCAN4X5X_MCAN_TXBTO 0x10D8
> +#define TCAN4X5X_MCAN_TXBCF 0x10DC
> +#define TCAN4X5X_MCAN_TXBTIE 0x10E0
> +#define TCAN4X5X_MCAN_TXBCIE 0x10E4
> +#define TCAN4X5X_MCAN_TXEFC 0x10F0
> +#define TCAN4X5X_MCAN_TXEFS 0x10F4
> +#define TCAN4X5X_MCAN_TXEFA 0x10F8
> +
> +#define TCAN4X5X_MRAM_START 0x8000
> +#define TCAN4X5X_MRAM_SIZE 2048
> +
> +#define TCAN4X5X_MAX_REGISTER 0x8fff
> +
> +/* 64 byte buffer + 8 byte MCAN header */
> +#define TCAN4X5X_BUF_LEN 72
> +
> +struct tcan4x5x_priv {
> + struct can_priv can;
> + struct net_device *net;
> + struct regmap *regmap;
> + struct spi_device *spi;
> +
> + struct mutex tcan4x5x_lock; /* SPI device lock */
> +
> + struct gpio_desc *reset_gpio;
> + struct gpio_desc *interrupt_gpio;
> + struct gpio_desc *wake_gpio;
> + struct regulator *power;
> + struct clk *clk;
> +
> + struct sk_buff *tx_skb;
> + int tx_len;
> +
> + struct workqueue_struct *wq;
> + struct work_struct tx_work;
> + struct work_struct restart_work;
> +
> + u32 *spi_tx_buf;
> + u32 *spi_rx_buf;
> +
> + int force_quit;
> + int after_suspend;
> +#define AFTER_SUSPEND_UP 1
> +#define AFTER_SUSPEND_DOWN 2
> +#define AFTER_SUSPEND_POWER 4
> +#define AFTER_SUSPEND_RESTART 8
> + int restart_tx;
> +
> + int irq;
> +};
>
--
------------------
Dan Murphy
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