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Message-ID: <4c9396a4-4028-f013-b22b-a181ef4278c7@ti.com>
Date: Wed, 26 Sep 2018 13:00:18 -0500
From: Dan Murphy <dmurphy@...com>
To: Wolfgang Grandegger <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
Wolfgang
On 09/26/2018 12:54 PM, Wolfgang Grandegger wrote:
> Hello,
>
> I wonder why you do not extend the existing MCAN driver by implementing
> an interface to access the hardware. Would that be feasible?
>
That did cross my mind. The issue is I have no way of testing the existing
driver to make sure I did not break anything.
My thought was to create a basic MCAN framework and attach the devices to it.
So, like in this case, if there is a special way to talk to the device it can
be handled in the device driver.
If thats what is needed then I will have to re-write the driver.
Dan
> Wolfgang.
>
> Am 26.09.2018 um 19:40 schrieb Dan Murphy:
>> 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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