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Message-Id: <20220419152554.2925353-14-mkl@pengutronix.de>
Date: Tue, 19 Apr 2022 17:25:50 +0200
From: Marc Kleine-Budde <mkl@...gutronix.de>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net, kuba@...nel.org, linux-can@...r.kernel.org,
kernel@...gutronix.de, Martin Jerabek <martin.jerabek01@...il.com>,
Ondrej Ille <ondrej.ille@...il.com>,
Pavel Pisa <pisa@....felk.cvut.cz>,
Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH net-next 13/17] can: ctucanfd: add support for CTU CAN FD open-source IP core - bus independent part.
From: Martin Jerabek <martin.jerabek01@...il.com>
This driver adds support for the CTU CAN FD open-source IP core.
More documentation and core sources at project page
(https://gitlab.fel.cvut.cz/canbus/ctucanfd_ip_core).
The core integration to Xilinx Zynq system as platform driver
is available (https://gitlab.fel.cvut.cz/canbus/zynq/zynq-can-sja1000-top).
Implementation on Intel FPGA based PCI Express board is available
from project (https://gitlab.fel.cvut.cz/canbus/pcie-ctucanfd).
More about CAN bus related projects used and developed at CTU FEE at
https://canbus.pages.fel.cvut.cz/ .
Link: https://lore.kernel.org/all/1906e4941560ae2ce4b8d181131fd4963aa31611.1647904780.git.pisa@cmp.felk.cvut.cz
Signed-off-by: Martin Jerabek <martin.jerabek01@...il.com>
Signed-off-by: Ondrej Ille <ondrej.ille@...il.com>
Signed-off-by: Pavel Pisa <pisa@....felk.cvut.cz>
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
---
drivers/net/can/Kconfig | 1 +
drivers/net/can/Makefile | 1 +
drivers/net/can/ctucanfd/Kconfig | 12 +
drivers/net/can/ctucanfd/Makefile | 7 +
drivers/net/can/ctucanfd/ctucanfd.h | 82 ++
drivers/net/can/ctucanfd/ctucanfd_base.c | 1490 ++++++++++++++++++++
drivers/net/can/ctucanfd/ctucanfd_kframe.h | 77 +
drivers/net/can/ctucanfd/ctucanfd_kregs.h | 325 +++++
8 files changed, 1995 insertions(+)
create mode 100644 drivers/net/can/ctucanfd/Kconfig
create mode 100644 drivers/net/can/ctucanfd/Makefile
create mode 100644 drivers/net/can/ctucanfd/ctucanfd.h
create mode 100644 drivers/net/can/ctucanfd/ctucanfd_base.c
create mode 100644 drivers/net/can/ctucanfd/ctucanfd_kframe.h
create mode 100644 drivers/net/can/ctucanfd/ctucanfd_kregs.h
diff --git a/drivers/net/can/Kconfig b/drivers/net/can/Kconfig
index fff259247d52..ac760fd39282 100644
--- a/drivers/net/can/Kconfig
+++ b/drivers/net/can/Kconfig
@@ -170,6 +170,7 @@ config PCH_CAN
source "drivers/net/can/c_can/Kconfig"
source "drivers/net/can/cc770/Kconfig"
+source "drivers/net/can/ctucanfd/Kconfig"
source "drivers/net/can/ifi_canfd/Kconfig"
source "drivers/net/can/m_can/Kconfig"
source "drivers/net/can/mscan/Kconfig"
diff --git a/drivers/net/can/Makefile b/drivers/net/can/Makefile
index 1e660afcb61b..0af85983634c 100644
--- a/drivers/net/can/Makefile
+++ b/drivers/net/can/Makefile
@@ -16,6 +16,7 @@ obj-y += softing/
obj-$(CONFIG_CAN_AT91) += at91_can.o
obj-$(CONFIG_CAN_CC770) += cc770/
obj-$(CONFIG_CAN_C_CAN) += c_can/
+obj-$(CONFIG_CAN_CTUCANFD) += ctucanfd/
obj-$(CONFIG_CAN_FLEXCAN) += flexcan/
obj-$(CONFIG_CAN_GRCAN) += grcan.o
obj-$(CONFIG_CAN_IFI_CANFD) += ifi_canfd/
diff --git a/drivers/net/can/ctucanfd/Kconfig b/drivers/net/can/ctucanfd/Kconfig
new file mode 100644
index 000000000000..b5f364068f86
--- /dev/null
+++ b/drivers/net/can/ctucanfd/Kconfig
@@ -0,0 +1,12 @@
+config CAN_CTUCANFD
+ tristate "CTU CAN-FD IP core"
+ help
+ This driver adds support for the CTU CAN FD open-source IP core.
+ More documentation and core sources at project page
+ (https://gitlab.fel.cvut.cz/canbus/ctucanfd_ip_core).
+ The core integration to Xilinx Zynq system as platform driver
+ is available (https://gitlab.fel.cvut.cz/canbus/zynq/zynq-can-sja1000-top).
+ Implementation on Intel FPGA-based PCI Express board is available
+ from project (https://gitlab.fel.cvut.cz/canbus/pcie-ctucanfd) and
+ on Intel SoC from project (https://gitlab.fel.cvut.cz/canbus/intel-soc-ctucanfd).
+ Guidepost CTU FEE CAN bus projects page https://canbus.pages.fel.cvut.cz/ .
diff --git a/drivers/net/can/ctucanfd/Makefile b/drivers/net/can/ctucanfd/Makefile
new file mode 100644
index 000000000000..259ecb0222c2
--- /dev/null
+++ b/drivers/net/can/ctucanfd/Makefile
@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+#
+# Makefile for the CTU CAN-FD IP module drivers
+#
+
+obj-$(CONFIG_CAN_CTUCANFD) := ctucanfd.o
+ctucanfd-y := ctucanfd_base.o
diff --git a/drivers/net/can/ctucanfd/ctucanfd.h b/drivers/net/can/ctucanfd/ctucanfd.h
new file mode 100644
index 000000000000..0e9904f6a05d
--- /dev/null
+++ b/drivers/net/can/ctucanfd/ctucanfd.h
@@ -0,0 +1,82 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*******************************************************************************
+ *
+ * CTU CAN FD IP Core
+ *
+ * Copyright (C) 2015-2018 Ondrej Ille <ondrej.ille@...il.com> FEE CTU
+ * Copyright (C) 2018-2021 Ondrej Ille <ondrej.ille@...il.com> self-funded
+ * Copyright (C) 2018-2019 Martin Jerabek <martin.jerabek01@...il.com> FEE CTU
+ * Copyright (C) 2018-2021 Pavel Pisa <pisa@....felk.cvut.cz> FEE CTU/self-funded
+ *
+ * Project advisors:
+ * Jiri Novak <jnovak@....cvut.cz>
+ * Pavel Pisa <pisa@....felk.cvut.cz>
+ *
+ * Department of Measurement (http://meas.fel.cvut.cz/)
+ * Faculty of Electrical Engineering (http://www.fel.cvut.cz)
+ * Czech Technical University (http://www.cvut.cz/)
+ ******************************************************************************/
+
+#ifndef __CTUCANFD__
+#define __CTUCANFD__
+
+#include <linux/netdevice.h>
+#include <linux/can/dev.h>
+#include <linux/list.h>
+
+enum ctu_can_fd_can_registers;
+
+struct ctucan_priv {
+ struct can_priv can; /* must be first member! */
+
+ void __iomem *mem_base;
+ u32 (*read_reg)(struct ctucan_priv *priv,
+ enum ctu_can_fd_can_registers reg);
+ void (*write_reg)(struct ctucan_priv *priv,
+ enum ctu_can_fd_can_registers reg, u32 val);
+
+ unsigned int txb_head;
+ unsigned int txb_tail;
+ u32 txb_prio;
+ unsigned int ntxbufs;
+ spinlock_t tx_lock; /* spinlock to serialize allocation and processing of TX buffers */
+
+ struct napi_struct napi;
+ struct device *dev;
+ struct clk *can_clk;
+
+ int irq_flags;
+ unsigned long drv_flags;
+
+ u32 rxfrm_first_word;
+
+ struct list_head peers_on_pdev;
+};
+
+/**
+ * ctucan_probe_common - Device type independent registration call
+ *
+ * This function does all the memory allocation and registration for the CAN
+ * device.
+ *
+ * @dev: Handle to the generic device structure
+ * @addr: Base address of CTU CAN FD core address
+ * @irq: Interrupt number
+ * @ntxbufs: Number of implemented Tx buffers
+ * @can_clk_rate: Clock rate, if 0 then clock are taken from device node
+ * @pm_enable_call: Whether pm_runtime_enable should be called
+ * @set_drvdata_fnc: Function to set network driver data for physical device
+ *
+ * Return: 0 on success and failure value on error
+ */
+int ctucan_probe_common(struct device *dev, void __iomem *addr,
+ int irq, unsigned int ntxbufs,
+ unsigned long can_clk_rate,
+ int pm_enable_call,
+ void (*set_drvdata_fnc)(struct device *dev,
+ struct net_device *ndev));
+
+int ctucan_suspend(struct device *dev) __maybe_unused;
+int ctucan_resume(struct device *dev) __maybe_unused;
+
+#endif /*__CTUCANFD__*/
diff --git a/drivers/net/can/ctucanfd/ctucanfd_base.c b/drivers/net/can/ctucanfd/ctucanfd_base.c
new file mode 100644
index 000000000000..7a4550f60abb
--- /dev/null
+++ b/drivers/net/can/ctucanfd/ctucanfd_base.c
@@ -0,0 +1,1490 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*******************************************************************************
+ *
+ * CTU CAN FD IP Core
+ *
+ * Copyright (C) 2015-2018 Ondrej Ille <ondrej.ille@...il.com> FEE CTU
+ * Copyright (C) 2018-2021 Ondrej Ille <ondrej.ille@...il.com> self-funded
+ * Copyright (C) 2018-2019 Martin Jerabek <martin.jerabek01@...il.com> FEE CTU
+ * Copyright (C) 2018-2022 Pavel Pisa <pisa@....felk.cvut.cz> FEE CTU/self-funded
+ *
+ * Project advisors:
+ * Jiri Novak <jnovak@....cvut.cz>
+ * Pavel Pisa <pisa@....felk.cvut.cz>
+ *
+ * Department of Measurement (http://meas.fel.cvut.cz/)
+ * Faculty of Electrical Engineering (http://www.fel.cvut.cz)
+ * Czech Technical University (http://www.cvut.cz/)
+ ******************************************************************************/
+
+#include <linux/clk.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/bitfield.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/can/error.h>
+#include <linux/can/led.h>
+#include <linux/pm_runtime.h>
+#include <linux/version.h>
+
+#include "ctucanfd.h"
+#include "ctucanfd_kregs.h"
+#include "ctucanfd_kframe.h"
+
+#ifdef DEBUG
+#define ctucan_netdev_dbg(ndev, args...) \
+ netdev_dbg(ndev, args)
+#else
+#define ctucan_netdev_dbg(...) do { } while (0)
+#endif
+
+#define CTUCANFD_ID 0xCAFD
+
+/* TX buffer rotation:
+ * - when a buffer transitions to empty state, rotate order and priorities
+ * - if more buffers seem to transition at the same time, rotate by the number of buffers
+ * - it may be assumed that buffers transition to empty state in FIFO order (because we manage
+ * priorities that way)
+ * - at frame filling, do not rotate anything, just increment buffer modulo counter
+ */
+
+#define CTUCANFD_FLAG_RX_FFW_BUFFERED 1
+
+#define CTUCAN_STATE_TO_TEXT_ENTRY(st) \
+ [st] = #st
+
+enum ctucan_txtb_status {
+ TXT_NOT_EXIST = 0x0,
+ TXT_RDY = 0x1,
+ TXT_TRAN = 0x2,
+ TXT_ABTP = 0x3,
+ TXT_TOK = 0x4,
+ TXT_ERR = 0x6,
+ TXT_ABT = 0x7,
+ TXT_ETY = 0x8,
+};
+
+enum ctucan_txtb_command {
+ TXT_CMD_SET_EMPTY = 0x01,
+ TXT_CMD_SET_READY = 0x02,
+ TXT_CMD_SET_ABORT = 0x04
+};
+
+static const struct can_bittiming_const ctu_can_fd_bit_timing_max = {
+ .name = "ctu_can_fd",
+ .tseg1_min = 2,
+ .tseg1_max = 190,
+ .tseg2_min = 1,
+ .tseg2_max = 63,
+ .sjw_max = 31,
+ .brp_min = 1,
+ .brp_max = 8,
+ .brp_inc = 1,
+};
+
+static const struct can_bittiming_const ctu_can_fd_bit_timing_data_max = {
+ .name = "ctu_can_fd",
+ .tseg1_min = 2,
+ .tseg1_max = 94,
+ .tseg2_min = 1,
+ .tseg2_max = 31,
+ .sjw_max = 31,
+ .brp_min = 1,
+ .brp_max = 2,
+ .brp_inc = 1,
+};
+
+static const char * const ctucan_state_strings[CAN_STATE_MAX] = {
+ CTUCAN_STATE_TO_TEXT_ENTRY(CAN_STATE_ERROR_ACTIVE),
+ CTUCAN_STATE_TO_TEXT_ENTRY(CAN_STATE_ERROR_WARNING),
+ CTUCAN_STATE_TO_TEXT_ENTRY(CAN_STATE_ERROR_PASSIVE),
+ CTUCAN_STATE_TO_TEXT_ENTRY(CAN_STATE_BUS_OFF),
+ CTUCAN_STATE_TO_TEXT_ENTRY(CAN_STATE_STOPPED),
+ CTUCAN_STATE_TO_TEXT_ENTRY(CAN_STATE_SLEEPING)
+};
+
+static void ctucan_write32_le(struct ctucan_priv *priv,
+ enum ctu_can_fd_can_registers reg, u32 val)
+{
+ iowrite32(val, priv->mem_base + reg);
+}
+
+static void ctucan_write32_be(struct ctucan_priv *priv,
+ enum ctu_can_fd_can_registers reg, u32 val)
+{
+ iowrite32be(val, priv->mem_base + reg);
+}
+
+static u32 ctucan_read32_le(struct ctucan_priv *priv,
+ enum ctu_can_fd_can_registers reg)
+{
+ return ioread32(priv->mem_base + reg);
+}
+
+static u32 ctucan_read32_be(struct ctucan_priv *priv,
+ enum ctu_can_fd_can_registers reg)
+{
+ return ioread32be(priv->mem_base + reg);
+}
+
+static inline void ctucan_write32(struct ctucan_priv *priv, enum ctu_can_fd_can_registers reg,
+ u32 val)
+{
+ priv->write_reg(priv, reg, val);
+}
+
+static inline u32 ctucan_read32(struct ctucan_priv *priv, enum ctu_can_fd_can_registers reg)
+{
+ return priv->read_reg(priv, reg);
+}
+
+static void ctucan_write_txt_buf(struct ctucan_priv *priv, enum ctu_can_fd_can_registers buf_base,
+ u32 offset, u32 val)
+{
+ priv->write_reg(priv, buf_base + offset, val);
+}
+
+#define CTU_CAN_FD_TXTNF(priv) (!!FIELD_GET(REG_STATUS_TXNF, ctucan_read32(priv, CTUCANFD_STATUS)))
+#define CTU_CAN_FD_ENABLED(priv) (!!FIELD_GET(REG_MODE_ENA, ctucan_read32(priv, CTUCANFD_MODE)))
+
+/**
+ * ctucan_state_to_str() - Converts CAN controller state code to corresponding text
+ * @state: CAN controller state code
+ *
+ * Return: Pointer to string representation of the error state
+ */
+static const char *ctucan_state_to_str(enum can_state state)
+{
+ const char *txt = NULL;
+
+ if (state >= 0 && state < CAN_STATE_MAX)
+ txt = ctucan_state_strings[state];
+ return txt ? txt : "UNKNOWN";
+}
+
+/**
+ * ctucan_reset() - Issues software reset request to CTU CAN FD
+ * @ndev: Pointer to net_device structure
+ *
+ * Return: 0 for success, -%ETIMEDOUT if CAN controller does not leave reset
+ */
+static int ctucan_reset(struct net_device *ndev)
+{
+ struct ctucan_priv *priv = netdev_priv(ndev);
+ int i = 100;
+
+ ctucan_netdev_dbg(ndev, "%s\n", __func__);
+
+ ctucan_write32(priv, CTUCANFD_MODE, REG_MODE_RST);
+ clear_bit(CTUCANFD_FLAG_RX_FFW_BUFFERED, &priv->drv_flags);
+
+ do {
+ u16 device_id = FIELD_GET(REG_DEVICE_ID_DEVICE_ID,
+ ctucan_read32(priv, CTUCANFD_DEVICE_ID));
+
+ if (device_id == 0xCAFD)
+ return 0;
+ if (!i--) {
+ netdev_warn(ndev, "device did not leave reset\n");
+ return -ETIMEDOUT;
+ }
+ usleep_range(100, 200);
+ } while (1);
+}
+
+/**
+ * ctucan_set_btr() - Sets CAN bus bit timing in CTU CAN FD
+ * @ndev: Pointer to net_device structure
+ * @bt: Pointer to Bit timing structure
+ * @nominal: True - Nominal bit timing, False - Data bit timing
+ *
+ * Return: 0 - OK, -%EPERM if controller is enabled
+ */
+static int ctucan_set_btr(struct net_device *ndev, struct can_bittiming *bt, bool nominal)
+{
+ struct ctucan_priv *priv = netdev_priv(ndev);
+ int max_ph1_len = 31;
+ u32 btr = 0;
+ u32 prop_seg = bt->prop_seg;
+ u32 phase_seg1 = bt->phase_seg1;
+
+ if (CTU_CAN_FD_ENABLED(priv)) {
+ netdev_err(ndev, "BUG! Cannot set bittiming - CAN is enabled\n");
+ return -EPERM;
+ }
+
+ if (nominal)
+ max_ph1_len = 63;
+
+ /* The timing calculation functions have only constraints on tseg1, which is prop_seg +
+ * phase1_seg combined. tseg1 is then split in half and stored into prog_seg and phase_seg1.
+ * In CTU CAN FD, PROP is 6/7 bits wide but PH1 only 6/5, so we must re-distribute the
+ * values here.
+ */
+ if (phase_seg1 > max_ph1_len) {
+ prop_seg += phase_seg1 - max_ph1_len;
+ phase_seg1 = max_ph1_len;
+ bt->prop_seg = prop_seg;
+ bt->phase_seg1 = phase_seg1;
+ }
+
+ if (nominal) {
+ btr = FIELD_PREP(REG_BTR_PROP, prop_seg);
+ btr |= FIELD_PREP(REG_BTR_PH1, phase_seg1);
+ btr |= FIELD_PREP(REG_BTR_PH2, bt->phase_seg2);
+ btr |= FIELD_PREP(REG_BTR_BRP, bt->brp);
+ btr |= FIELD_PREP(REG_BTR_SJW, bt->sjw);
+
+ ctucan_write32(priv, CTUCANFD_BTR, btr);
+ } else {
+ btr = FIELD_PREP(REG_BTR_FD_PROP_FD, prop_seg);
+ btr |= FIELD_PREP(REG_BTR_FD_PH1_FD, phase_seg1);
+ btr |= FIELD_PREP(REG_BTR_FD_PH2_FD, bt->phase_seg2);
+ btr |= FIELD_PREP(REG_BTR_FD_BRP_FD, bt->brp);
+ btr |= FIELD_PREP(REG_BTR_FD_SJW_FD, bt->sjw);
+
+ ctucan_write32(priv, CTUCANFD_BTR_FD, btr);
+ }
+
+ return 0;
+}
+
+/**
+ * ctucan_set_bittiming() - CAN set nominal bit timing routine
+ * @ndev: Pointer to net_device structure
+ *
+ * Return: 0 on success, -%EPERM on error
+ */
+static int ctucan_set_bittiming(struct net_device *ndev)
+{
+ struct ctucan_priv *priv = netdev_priv(ndev);
+ struct can_bittiming *bt = &priv->can.bittiming;
+
+ ctucan_netdev_dbg(ndev, "%s\n", __func__);
+
+ /* Note that bt may be modified here */
+ return ctucan_set_btr(ndev, bt, true);
+}
+
+/**
+ * ctucan_set_data_bittiming() - CAN set data bit timing routine
+ * @ndev: Pointer to net_device structure
+ *
+ * Return: 0 on success, -%EPERM on error
+ */
+static int ctucan_set_data_bittiming(struct net_device *ndev)
+{
+ struct ctucan_priv *priv = netdev_priv(ndev);
+ struct can_bittiming *dbt = &priv->can.data_bittiming;
+
+ ctucan_netdev_dbg(ndev, "%s\n", __func__);
+
+ /* Note that dbt may be modified here */
+ return ctucan_set_btr(ndev, dbt, false);
+}
+
+/**
+ * ctucan_set_secondary_sample_point() - Sets secondary sample point in CTU CAN FD
+ * @ndev: Pointer to net_device structure
+ *
+ * Return: 0 on success, -%EPERM if controller is enabled
+ */
+static int ctucan_set_secondary_sample_point(struct net_device *ndev)
+{
+ struct ctucan_priv *priv = netdev_priv(ndev);
+ struct can_bittiming *dbt = &priv->can.data_bittiming;
+ int ssp_offset = 0;
+ u32 ssp_cfg = 0; /* No SSP by default */
+
+ ctucan_netdev_dbg(ndev, "%s\n", __func__);
+
+ if (CTU_CAN_FD_ENABLED(priv)) {
+ netdev_err(ndev, "BUG! Cannot set SSP - CAN is enabled\n");
+ return -EPERM;
+ }
+
+ /* Use SSP for bit-rates above 1 Mbits/s */
+ if (dbt->bitrate > 1000000) {
+ /* Calculate SSP in minimal time quanta */
+ ssp_offset = (priv->can.clock.freq / 1000) * dbt->sample_point / dbt->bitrate;
+
+ if (ssp_offset > 127) {
+ netdev_warn(ndev, "SSP offset saturated to 127\n");
+ ssp_offset = 127;
+ }
+
+ ssp_cfg = FIELD_PREP(REG_TRV_DELAY_SSP_OFFSET, ssp_offset);
+ ssp_cfg |= FIELD_PREP(REG_TRV_DELAY_SSP_SRC, 0x1);
+ }
+
+ ctucan_write32(priv, CTUCANFD_TRV_DELAY, ssp_cfg);
+
+ return 0;
+}
+
+/**
+ * ctucan_set_mode() - Sets CTU CAN FDs mode
+ * @priv: Pointer to private data
+ * @mode: Pointer to controller modes to be set
+ */
+static void ctucan_set_mode(struct ctucan_priv *priv, const struct can_ctrlmode *mode)
+{
+ u32 mode_reg = ctucan_read32(priv, CTUCANFD_MODE);
+
+ mode_reg = (mode->flags & CAN_CTRLMODE_LOOPBACK) ?
+ (mode_reg | REG_MODE_ILBP) :
+ (mode_reg & ~REG_MODE_ILBP);
+
+ mode_reg = (mode->flags & CAN_CTRLMODE_LISTENONLY) ?
+ (mode_reg | REG_MODE_BMM) :
+ (mode_reg & ~REG_MODE_BMM);
+
+ mode_reg = (mode->flags & CAN_CTRLMODE_FD) ?
+ (mode_reg | REG_MODE_FDE) :
+ (mode_reg & ~REG_MODE_FDE);
+
+ mode_reg = (mode->flags & CAN_CTRLMODE_PRESUME_ACK) ?
+ (mode_reg | REG_MODE_ACF) :
+ (mode_reg & ~REG_MODE_ACF);
+
+ mode_reg = (mode->flags & CAN_CTRLMODE_FD_NON_ISO) ?
+ (mode_reg | REG_MODE_NISOFD) :
+ (mode_reg & ~REG_MODE_NISOFD);
+
+ /* One shot mode supported indirectly via Retransmit limit */
+ mode_reg &= ~FIELD_PREP(REG_MODE_RTRTH, 0xF);
+ mode_reg = (mode->flags & CAN_CTRLMODE_ONE_SHOT) ?
+ (mode_reg | REG_MODE_RTRLE) :
+ (mode_reg & ~REG_MODE_RTRLE);
+
+ /* Some bits fixed:
+ * TSTM - Off, User shall not be able to change REC/TEC by hand during operation
+ */
+ mode_reg &= ~REG_MODE_TSTM;
+
+ ctucan_write32(priv, CTUCANFD_MODE, mode_reg);
+}
+
+/**
+ * ctucan_chip_start() - This routine starts the driver
+ * @ndev: Pointer to net_device structure
+ *
+ * Routine expects that chip is in reset state. It setups initial
+ * Tx buffers for FIFO priorities, sets bittiming, enables interrupts,
+ * switches core to operational mode and changes controller
+ * state to %CAN_STATE_STOPPED.
+ *
+ * Return: 0 on success and failure value on error
+ */
+static int ctucan_chip_start(struct net_device *ndev)
+{
+ struct ctucan_priv *priv = netdev_priv(ndev);
+ u32 int_ena, int_msk;
+ u32 mode_reg;
+ int err;
+ struct can_ctrlmode mode;
+
+ ctucan_netdev_dbg(ndev, "%s\n", __func__);
+
+ priv->txb_prio = 0x01234567;
+ priv->txb_head = 0;
+ priv->txb_tail = 0;
+ ctucan_write32(priv, CTUCANFD_TX_PRIORITY, priv->txb_prio);
+
+ /* Configure bit-rates and ssp */
+ err = ctucan_set_bittiming(ndev);
+ if (err < 0)
+ return err;
+
+ err = ctucan_set_data_bittiming(ndev);
+ if (err < 0)
+ return err;
+
+ err = ctucan_set_secondary_sample_point(ndev);
+ if (err < 0)
+ return err;
+
+ /* Configure modes */
+ mode.flags = priv->can.ctrlmode;
+ mode.mask = 0xFFFFFFFF;
+ ctucan_set_mode(priv, &mode);
+
+ /* Configure interrupts */
+ int_ena = REG_INT_STAT_RBNEI |
+ REG_INT_STAT_TXBHCI |
+ REG_INT_STAT_EWLI |
+ REG_INT_STAT_FCSI;
+
+ /* Bus error reporting -> Allow Error/Arb.lost interrupts */
+ if (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING) {
+ int_ena |= REG_INT_STAT_ALI |
+ REG_INT_STAT_BEI;
+ }
+
+ int_msk = ~int_ena; /* Mask all disabled interrupts */
+
+ /* It's after reset, so there is no need to clear anything */
+ ctucan_write32(priv, CTUCANFD_INT_MASK_SET, int_msk);
+ ctucan_write32(priv, CTUCANFD_INT_ENA_SET, int_ena);
+
+ /* Controller enters ERROR_ACTIVE on initial FCSI */
+ priv->can.state = CAN_STATE_STOPPED;
+
+ /* Enable the controller */
+ mode_reg = ctucan_read32(priv, CTUCANFD_MODE);
+ mode_reg |= REG_MODE_ENA;
+ ctucan_write32(priv, CTUCANFD_MODE, mode_reg);
+
+ return 0;
+}
+
+/**
+ * ctucan_do_set_mode() - Sets 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 corresponding modes to set.
+ *
+ * Return: 0 on success and failure value on error
+ */
+static int ctucan_do_set_mode(struct net_device *ndev, enum can_mode mode)
+{
+ int ret;
+
+ ctucan_netdev_dbg(ndev, "%s\n", __func__);
+
+ switch (mode) {
+ case CAN_MODE_START:
+ ret = ctucan_reset(ndev);
+ if (ret < 0)
+ return ret;
+ ret = ctucan_chip_start(ndev);
+ if (ret < 0) {
+ netdev_err(ndev, "ctucan_chip_start failed!\n");
+ return ret;
+ }
+ netif_wake_queue(ndev);
+ break;
+ default:
+ ret = -EOPNOTSUPP;
+ break;
+ }
+
+ return ret;
+}
+
+/**
+ * ctucan_get_tx_status() - Gets status of TXT buffer
+ * @priv: Pointer to private data
+ * @buf: Buffer index (0-based)
+ *
+ * Return: Status of TXT buffer
+ */
+static inline enum ctucan_txtb_status ctucan_get_tx_status(struct ctucan_priv *priv, u8 buf)
+{
+ u32 tx_status = ctucan_read32(priv, CTUCANFD_TX_STATUS);
+ enum ctucan_txtb_status status = (tx_status >> (buf * 4)) & 0x7;
+
+ return status;
+}
+
+/**
+ * ctucan_is_txt_buf_writable() - Checks if frame can be inserted to TXT Buffer
+ * @priv: Pointer to private data
+ * @buf: Buffer index (0-based)
+ *
+ * Return: True - Frame can be inserted to TXT Buffer, False - If attempted, frame will not be
+ * inserted to TXT Buffer
+ */
+static bool ctucan_is_txt_buf_writable(struct ctucan_priv *priv, u8 buf)
+{
+ enum ctucan_txtb_status buf_status;
+
+ buf_status = ctucan_get_tx_status(priv, buf);
+ if (buf_status == TXT_RDY || buf_status == TXT_TRAN || buf_status == TXT_ABTP)
+ return false;
+
+ return true;
+}
+
+/**
+ * ctucan_insert_frame() - Inserts frame to TXT buffer
+ * @priv: Pointer to private data
+ * @cf: Pointer to CAN frame to be inserted
+ * @buf: TXT Buffer index to which frame is inserted (0-based)
+ * @isfdf: True - CAN FD Frame, False - CAN 2.0 Frame
+ *
+ * Return: True - Frame inserted successfully
+ * False - Frame was not inserted due to one of:
+ * 1. TXT Buffer is not writable (it is in wrong state)
+ * 2. Invalid TXT buffer index
+ * 3. Invalid frame length
+ */
+static bool ctucan_insert_frame(struct ctucan_priv *priv, const struct canfd_frame *cf, u8 buf,
+ bool isfdf)
+{
+ u32 buf_base;
+ u32 ffw = 0;
+ u32 idw = 0;
+ unsigned int i;
+
+ if (buf >= priv->ntxbufs)
+ return false;
+
+ if (!ctucan_is_txt_buf_writable(priv, buf))
+ return false;
+
+ if (cf->len > CANFD_MAX_DLEN)
+ return false;
+
+ /* Prepare Frame format */
+ if (cf->can_id & CAN_RTR_FLAG)
+ ffw |= REG_FRAME_FORMAT_W_RTR;
+
+ if (cf->can_id & CAN_EFF_FLAG)
+ ffw |= REG_FRAME_FORMAT_W_IDE;
+
+ if (isfdf) {
+ ffw |= REG_FRAME_FORMAT_W_FDF;
+ if (cf->flags & CANFD_BRS)
+ ffw |= REG_FRAME_FORMAT_W_BRS;
+ }
+
+ ffw |= FIELD_PREP(REG_FRAME_FORMAT_W_DLC, can_fd_len2dlc(cf->len));
+
+ /* Prepare identifier */
+ if (cf->can_id & CAN_EFF_FLAG)
+ idw = cf->can_id & CAN_EFF_MASK;
+ else
+ idw = FIELD_PREP(REG_IDENTIFIER_W_IDENTIFIER_BASE, cf->can_id & CAN_SFF_MASK);
+
+ /* Write ID, Frame format, Don't write timestamp -> Time triggered transmission disabled */
+ buf_base = (buf + 1) * 0x100;
+ ctucan_write_txt_buf(priv, buf_base, CTUCANFD_FRAME_FORMAT_W, ffw);
+ ctucan_write_txt_buf(priv, buf_base, CTUCANFD_IDENTIFIER_W, idw);
+
+ /* Write Data payload */
+ if (!(cf->can_id & CAN_RTR_FLAG)) {
+ for (i = 0; i < cf->len; i += 4) {
+ u32 data = le32_to_cpu(*(__le32 *)(cf->data + i));
+
+ ctucan_write_txt_buf(priv, buf_base, CTUCANFD_DATA_1_4_W + i, data);
+ }
+ }
+
+ return true;
+}
+
+/**
+ * ctucan_give_txtb_cmd() - Applies command on TXT buffer
+ * @priv: Pointer to private data
+ * @cmd: Command to give
+ * @buf: Buffer index (0-based)
+ */
+static void ctucan_give_txtb_cmd(struct ctucan_priv *priv, enum ctucan_txtb_command cmd, u8 buf)
+{
+ u32 tx_cmd = cmd;
+
+ tx_cmd |= 1 << (buf + 8);
+ ctucan_write32(priv, CTUCANFD_TX_COMMAND, tx_cmd);
+}
+
+/**
+ * ctucan_start_xmit() - Starts the transmission
+ * @skb: sk_buff pointer that contains data to be Txed
+ * @ndev: Pointer to net_device structure
+ *
+ * Invoked from upper layers to initiate transmission. Uses the next available free TXT Buffer and
+ * populates its fields to start the transmission.
+ *
+ * Return: %NETDEV_TX_OK on success, %NETDEV_TX_BUSY when no free TXT buffer is available,
+ * negative return values reserved for error cases
+ */
+static netdev_tx_t ctucan_start_xmit(struct sk_buff *skb, struct net_device *ndev)
+{
+ struct ctucan_priv *priv = netdev_priv(ndev);
+ struct canfd_frame *cf = (struct canfd_frame *)skb->data;
+ u32 txtb_id;
+ bool ok;
+ unsigned long flags;
+
+ if (can_dropped_invalid_skb(ndev, skb))
+ return NETDEV_TX_OK;
+
+ if (unlikely(!CTU_CAN_FD_TXTNF(priv))) {
+ netif_stop_queue(ndev);
+ netdev_err(ndev, "BUG!, no TXB free when queue awake!\n");
+ return NETDEV_TX_BUSY;
+ }
+
+ txtb_id = priv->txb_head % priv->ntxbufs;
+ ctucan_netdev_dbg(ndev, "%s: using TXB#%u\n", __func__, txtb_id);
+ ok = ctucan_insert_frame(priv, cf, txtb_id, can_is_canfd_skb(skb));
+
+ if (!ok) {
+ netdev_err(ndev, "BUG! TXNF set but cannot insert frame into TXTB! HW Bug?");
+ kfree_skb(skb);
+ ndev->stats.tx_dropped++;
+ return NETDEV_TX_OK;
+ }
+
+ can_put_echo_skb(skb, ndev, txtb_id, 0);
+
+ spin_lock_irqsave(&priv->tx_lock, flags);
+ ctucan_give_txtb_cmd(priv, TXT_CMD_SET_READY, txtb_id);
+ priv->txb_head++;
+
+ /* Check if all TX buffers are full */
+ if (!CTU_CAN_FD_TXTNF(priv))
+ netif_stop_queue(ndev);
+
+ spin_unlock_irqrestore(&priv->tx_lock, flags);
+
+ return NETDEV_TX_OK;
+}
+
+/**
+ * ctucan_read_rx_frame() - Reads frame from RX FIFO
+ * @priv: Pointer to CTU CAN FD's private data
+ * @cf: Pointer to CAN frame struct
+ * @ffw: Previously read frame format word
+ *
+ * Note: Frame format word must be read separately and provided in 'ffw'.
+ */
+static void ctucan_read_rx_frame(struct ctucan_priv *priv, struct canfd_frame *cf, u32 ffw)
+{
+ u32 idw;
+ unsigned int i;
+ unsigned int wc;
+ unsigned int len;
+
+ idw = ctucan_read32(priv, CTUCANFD_RX_DATA);
+ if (FIELD_GET(REG_FRAME_FORMAT_W_IDE, ffw))
+ cf->can_id = (idw & CAN_EFF_MASK) | CAN_EFF_FLAG;
+ else
+ cf->can_id = (idw >> 18) & CAN_SFF_MASK;
+
+ /* BRS, ESI, RTR Flags */
+ cf->flags = 0;
+ if (FIELD_GET(REG_FRAME_FORMAT_W_FDF, ffw)) {
+ if (FIELD_GET(REG_FRAME_FORMAT_W_BRS, ffw))
+ cf->flags |= CANFD_BRS;
+ if (FIELD_GET(REG_FRAME_FORMAT_W_ESI_RSV, ffw))
+ cf->flags |= CANFD_ESI;
+ } else if (FIELD_GET(REG_FRAME_FORMAT_W_RTR, ffw)) {
+ cf->can_id |= CAN_RTR_FLAG;
+ }
+
+ wc = FIELD_GET(REG_FRAME_FORMAT_W_RWCNT, ffw) - 3;
+
+ /* DLC */
+ if (FIELD_GET(REG_FRAME_FORMAT_W_DLC, ffw) <= 8) {
+ len = FIELD_GET(REG_FRAME_FORMAT_W_DLC, ffw);
+ } else {
+ if (FIELD_GET(REG_FRAME_FORMAT_W_FDF, ffw))
+ len = wc << 2;
+ else
+ len = 8;
+ }
+ cf->len = len;
+ if (unlikely(len > wc * 4))
+ len = wc * 4;
+
+ /* Timestamp - Read and throw away */
+ ctucan_read32(priv, CTUCANFD_RX_DATA);
+ ctucan_read32(priv, CTUCANFD_RX_DATA);
+
+ /* Data */
+ for (i = 0; i < len; i += 4) {
+ u32 data = ctucan_read32(priv, CTUCANFD_RX_DATA);
+ *(__le32 *)(cf->data + i) = cpu_to_le32(data);
+ }
+ while (unlikely(i < wc * 4)) {
+ ctucan_read32(priv, CTUCANFD_RX_DATA);
+ i += 4;
+ }
+}
+
+/**
+ * ctucan_rx() - Called from CAN ISR to complete the received frame processing
+ * @ndev: Pointer to net_device structure
+ *
+ * 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 when frame is passed to the network layer, 0 when the first frame word is read but
+ * system is out of free SKBs temporally and left code to resolve SKB allocation later,
+ * -%EAGAIN in a case of empty Rx FIFO.
+ */
+static int ctucan_rx(struct net_device *ndev)
+{
+ struct ctucan_priv *priv = netdev_priv(ndev);
+ struct net_device_stats *stats = &ndev->stats;
+ struct canfd_frame *cf;
+ struct sk_buff *skb;
+ u32 ffw;
+
+ if (test_bit(CTUCANFD_FLAG_RX_FFW_BUFFERED, &priv->drv_flags)) {
+ ffw = priv->rxfrm_first_word;
+ clear_bit(CTUCANFD_FLAG_RX_FFW_BUFFERED, &priv->drv_flags);
+ } else {
+ ffw = ctucan_read32(priv, CTUCANFD_RX_DATA);
+ }
+
+ if (!FIELD_GET(REG_FRAME_FORMAT_W_RWCNT, ffw))
+ return -EAGAIN;
+
+ if (FIELD_GET(REG_FRAME_FORMAT_W_FDF, ffw))
+ skb = alloc_canfd_skb(ndev, &cf);
+ else
+ skb = alloc_can_skb(ndev, (struct can_frame **)&cf);
+
+ if (unlikely(!skb)) {
+ priv->rxfrm_first_word = ffw;
+ set_bit(CTUCANFD_FLAG_RX_FFW_BUFFERED, &priv->drv_flags);
+ return 0;
+ }
+
+ ctucan_read_rx_frame(priv, cf, ffw);
+
+ stats->rx_bytes += cf->len;
+ stats->rx_packets++;
+ netif_receive_skb(skb);
+
+ return 1;
+}
+
+/**
+ * ctucan_read_fault_state() - Reads CTU CAN FDs fault confinement state.
+ * @priv: Pointer to private data
+ *
+ * Returns: Fault confinement state of controller
+ */
+static enum can_state ctucan_read_fault_state(struct ctucan_priv *priv)
+{
+ u32 fs;
+ u32 rec_tec;
+ u32 ewl;
+
+ fs = ctucan_read32(priv, CTUCANFD_EWL);
+ rec_tec = ctucan_read32(priv, CTUCANFD_REC);
+ ewl = FIELD_GET(REG_EWL_EW_LIMIT, fs);
+
+ if (FIELD_GET(REG_EWL_ERA, fs)) {
+ if (ewl > FIELD_GET(REG_REC_REC_VAL, rec_tec) &&
+ ewl > FIELD_GET(REG_REC_TEC_VAL, rec_tec))
+ return CAN_STATE_ERROR_ACTIVE;
+ else
+ return CAN_STATE_ERROR_WARNING;
+ } else if (FIELD_GET(REG_EWL_ERP, fs)) {
+ return CAN_STATE_ERROR_PASSIVE;
+ } else if (FIELD_GET(REG_EWL_BOF, fs)) {
+ return CAN_STATE_BUS_OFF;
+ }
+
+ WARN(true, "Invalid error state");
+ return CAN_STATE_ERROR_PASSIVE;
+}
+
+/**
+ * ctucan_get_rec_tec() - Reads REC/TEC counter values from controller
+ * @priv: Pointer to private data
+ * @bec: Pointer to Error counter structure
+ */
+static void ctucan_get_rec_tec(struct ctucan_priv *priv, struct can_berr_counter *bec)
+{
+ u32 err_ctrs = ctucan_read32(priv, CTUCANFD_REC);
+
+ bec->rxerr = FIELD_GET(REG_REC_REC_VAL, err_ctrs);
+ bec->txerr = FIELD_GET(REG_REC_TEC_VAL, err_ctrs);
+}
+
+/**
+ * ctucan_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 type of error and forward the error
+ * frame to upper layers.
+ */
+static void ctucan_err_interrupt(struct net_device *ndev, u32 isr)
+{
+ struct ctucan_priv *priv = netdev_priv(ndev);
+ struct net_device_stats *stats = &ndev->stats;
+ struct can_frame *cf;
+ struct sk_buff *skb;
+ enum can_state state;
+ struct can_berr_counter bec;
+ u32 err_capt_alc;
+ int dologerr = net_ratelimit();
+
+ ctucan_get_rec_tec(priv, &bec);
+ state = ctucan_read_fault_state(priv);
+ err_capt_alc = ctucan_read32(priv, CTUCANFD_ERR_CAPT);
+
+ if (dologerr)
+ netdev_info(ndev, "%s: ISR = 0x%08x, rxerr %d, txerr %d, error type %lu, pos %lu, ALC id_field %lu, bit %lu\n",
+ __func__, isr, bec.rxerr, bec.txerr,
+ FIELD_GET(REG_ERR_CAPT_ERR_TYPE, err_capt_alc),
+ FIELD_GET(REG_ERR_CAPT_ERR_POS, err_capt_alc),
+ FIELD_GET(REG_ERR_CAPT_ALC_ID_FIELD, err_capt_alc),
+ FIELD_GET(REG_ERR_CAPT_ALC_BIT, err_capt_alc));
+
+ skb = alloc_can_err_skb(ndev, &cf);
+
+ /* EWLI: error warning limit condition met
+ * FCSI: fault confinement state changed
+ * ALI: arbitration lost (just informative)
+ * BEI: bus error interrupt
+ */
+ if (FIELD_GET(REG_INT_STAT_FCSI, isr) || FIELD_GET(REG_INT_STAT_EWLI, isr)) {
+ netdev_info(ndev, "state changes from %s to %s\n",
+ ctucan_state_to_str(priv->can.state),
+ ctucan_state_to_str(state));
+
+ if (priv->can.state == state)
+ netdev_warn(ndev,
+ "current and previous state is the same! (missed interrupt?)\n");
+
+ priv->can.state = state;
+ switch (state) {
+ case CAN_STATE_BUS_OFF:
+ priv->can.can_stats.bus_off++;
+ can_bus_off(ndev);
+ if (skb)
+ cf->can_id |= CAN_ERR_BUSOFF;
+ break;
+ case CAN_STATE_ERROR_PASSIVE:
+ priv->can.can_stats.error_passive++;
+ if (skb) {
+ cf->can_id |= CAN_ERR_CRTL;
+ cf->data[1] = (bec.rxerr > 127) ?
+ CAN_ERR_CRTL_RX_PASSIVE :
+ CAN_ERR_CRTL_TX_PASSIVE;
+ cf->data[6] = bec.txerr;
+ cf->data[7] = bec.rxerr;
+ }
+ break;
+ case CAN_STATE_ERROR_WARNING:
+ priv->can.can_stats.error_warning++;
+ if (skb) {
+ cf->can_id |= CAN_ERR_CRTL;
+ cf->data[1] |= (bec.txerr > bec.rxerr) ?
+ CAN_ERR_CRTL_TX_WARNING :
+ CAN_ERR_CRTL_RX_WARNING;
+ cf->data[6] = bec.txerr;
+ cf->data[7] = bec.rxerr;
+ }
+ break;
+ case CAN_STATE_ERROR_ACTIVE:
+ cf->data[1] = CAN_ERR_CRTL_ACTIVE;
+ cf->data[6] = bec.txerr;
+ cf->data[7] = bec.rxerr;
+ break;
+ default:
+ netdev_warn(ndev, "unhandled error state (%d:%s)!\n",
+ state, ctucan_state_to_str(state));
+ break;
+ }
+ }
+
+ /* Check for Arbitration Lost interrupt */
+ if (FIELD_GET(REG_INT_STAT_ALI, isr)) {
+ if (dologerr)
+ netdev_info(ndev, "arbitration lost\n");
+ priv->can.can_stats.arbitration_lost++;
+ if (skb) {
+ cf->can_id |= CAN_ERR_LOSTARB;
+ cf->data[0] = CAN_ERR_LOSTARB_UNSPEC;
+ }
+ }
+
+ /* Check for Bus Error interrupt */
+ if (FIELD_GET(REG_INT_STAT_BEI, isr)) {
+ netdev_info(ndev, "bus error\n");
+ priv->can.can_stats.bus_error++;
+ stats->rx_errors++;
+ if (skb) {
+ cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
+ cf->data[2] = CAN_ERR_PROT_UNSPEC;
+ cf->data[3] = CAN_ERR_PROT_LOC_UNSPEC;
+ }
+ }
+
+ if (skb) {
+ stats->rx_packets++;
+ stats->rx_bytes += cf->can_dlc;
+ netif_rx(skb);
+ }
+}
+
+/**
+ * ctucan_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 ctucan_rx_poll(struct napi_struct *napi, int quota)
+{
+ struct net_device *ndev = napi->dev;
+ struct ctucan_priv *priv = netdev_priv(ndev);
+ int work_done = 0;
+ u32 status;
+ u32 framecnt;
+ int res = 1;
+
+ framecnt = FIELD_GET(REG_RX_STATUS_RXFRC, ctucan_read32(priv, CTUCANFD_RX_STATUS));
+ while (framecnt && work_done < quota && res > 0) {
+ res = ctucan_rx(ndev);
+ work_done++;
+ framecnt = FIELD_GET(REG_RX_STATUS_RXFRC, ctucan_read32(priv, CTUCANFD_RX_STATUS));
+ }
+
+ /* Check for RX FIFO Overflow */
+ status = ctucan_read32(priv, CTUCANFD_STATUS);
+ if (FIELD_GET(REG_STATUS_DOR, status)) {
+ struct net_device_stats *stats = &ndev->stats;
+ struct can_frame *cf;
+ struct sk_buff *skb;
+
+ netdev_info(ndev, "rx_poll: rx fifo overflow\n");
+ stats->rx_over_errors++;
+ stats->rx_errors++;
+ skb = alloc_can_err_skb(ndev, &cf);
+ if (skb) {
+ cf->can_id |= CAN_ERR_CRTL;
+ cf->data[1] |= CAN_ERR_CRTL_RX_OVERFLOW;
+ stats->rx_packets++;
+ stats->rx_bytes += cf->can_dlc;
+ netif_rx(skb);
+ }
+
+ /* Clear Data Overrun */
+ ctucan_write32(priv, CTUCANFD_COMMAND, REG_COMMAND_CDO);
+ }
+
+ if (work_done)
+ can_led_event(ndev, CAN_LED_EVENT_RX);
+
+ if (!framecnt && res != 0) {
+ if (napi_complete_done(napi, work_done)) {
+ /* Clear and enable RBNEI. It is level-triggered, so
+ * there is no race condition.
+ */
+ ctucan_write32(priv, CTUCANFD_INT_STAT, REG_INT_STAT_RBNEI);
+ ctucan_write32(priv, CTUCANFD_INT_MASK_CLR, REG_INT_STAT_RBNEI);
+ }
+ }
+
+ return work_done;
+}
+
+/**
+ * ctucan_rotate_txb_prio() - Rotates priorities of TXT Buffers
+ * @ndev: net_device pointer
+ */
+static void ctucan_rotate_txb_prio(struct net_device *ndev)
+{
+ struct ctucan_priv *priv = netdev_priv(ndev);
+ u32 prio = priv->txb_prio;
+
+ prio = (prio << 4) | ((prio >> ((priv->ntxbufs - 1) * 4)) & 0xF);
+ ctucan_netdev_dbg(ndev, "%s: from 0x%08x to 0x%08x\n", __func__, priv->txb_prio, prio);
+ priv->txb_prio = prio;
+ ctucan_write32(priv, CTUCANFD_TX_PRIORITY, prio);
+}
+
+/**
+ * ctucan_tx_interrupt() - Tx done Isr
+ * @ndev: net_device pointer
+ */
+static void ctucan_tx_interrupt(struct net_device *ndev)
+{
+ struct ctucan_priv *priv = netdev_priv(ndev);
+ struct net_device_stats *stats = &ndev->stats;
+ bool first = true;
+ bool some_buffers_processed;
+ unsigned long flags;
+ enum ctucan_txtb_status txtb_status;
+ u32 txtb_id;
+
+ /* read tx_status
+ * if txb[n].finished (bit 2)
+ * if ok -> echo
+ * if error / aborted -> ?? (find how to handle oneshot mode)
+ * txb_tail++
+ */
+ do {
+ spin_lock_irqsave(&priv->tx_lock, flags);
+
+ some_buffers_processed = false;
+ while ((int)(priv->txb_head - priv->txb_tail) > 0) {
+ txtb_id = priv->txb_tail % priv->ntxbufs;
+ txtb_status = ctucan_get_tx_status(priv, txtb_id);
+
+ ctucan_netdev_dbg(ndev, "TXI: TXB#%u: status 0x%x\n", txtb_id, txtb_status);
+
+ switch (txtb_status) {
+ case TXT_TOK:
+ ctucan_netdev_dbg(ndev, "TXT_OK\n");
+ stats->tx_bytes += can_get_echo_skb(ndev, txtb_id, NULL);
+ stats->tx_packets++;
+ break;
+ case TXT_ERR:
+ /* This indicated that retransmit limit has been reached. Obviously
+ * we should not echo the frame, but also not indicate any kind of
+ * error. If desired, it was already reported (possible multiple
+ * times) on each arbitration lost.
+ */
+ netdev_warn(ndev, "TXB in Error state\n");
+ can_free_echo_skb(ndev, txtb_id, NULL);
+ stats->tx_dropped++;
+ break;
+ case TXT_ABT:
+ /* Same as for TXT_ERR, only with different cause. We *could*
+ * re-queue the frame, but multiqueue/abort is not supported yet
+ * anyway.
+ */
+ netdev_warn(ndev, "TXB in Aborted state\n");
+ can_free_echo_skb(ndev, txtb_id, NULL);
+ stats->tx_dropped++;
+ break;
+ default:
+ /* Bug only if the first buffer is not finished, otherwise it is
+ * pretty much expected.
+ */
+ if (first) {
+ netdev_err(ndev,
+ "BUG: TXB#%u not in a finished state (0x%x)!\n",
+ txtb_id, txtb_status);
+ spin_unlock_irqrestore(&priv->tx_lock, flags);
+ /* do not clear nor wake */
+ return;
+ }
+ goto clear;
+ }
+ priv->txb_tail++;
+ first = false;
+ some_buffers_processed = true;
+ /* Adjust priorities *before* marking the buffer as empty. */
+ ctucan_rotate_txb_prio(ndev);
+ ctucan_give_txtb_cmd(priv, TXT_CMD_SET_EMPTY, txtb_id);
+ }
+clear:
+ spin_unlock_irqrestore(&priv->tx_lock, flags);
+
+ /* If no buffers were processed this time, we cannot clear - that would introduce
+ * a race condition.
+ */
+ if (some_buffers_processed) {
+ /* Clear the interrupt again. We do not want to receive again interrupt for
+ * the buffer already handled. If it is the last finished one then it would
+ * cause log of spurious interrupt.
+ */
+ ctucan_write32(priv, CTUCANFD_INT_STAT, REG_INT_STAT_TXBHCI);
+ }
+ } while (some_buffers_processed);
+
+ can_led_event(ndev, CAN_LED_EVENT_TX);
+
+ spin_lock_irqsave(&priv->tx_lock, flags);
+
+ /* Check if at least one TX buffer is free */
+ if (CTU_CAN_FD_TXTNF(priv))
+ netif_wake_queue(ndev);
+
+ spin_unlock_irqrestore(&priv->tx_lock, flags);
+}
+
+/**
+ * ctucan_interrupt() - CAN Isr
+ * @irq: irq number
+ * @dev_id: device id poniter
+ *
+ * This is the CTU CAN FD 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 ctucan_interrupt(int irq, void *dev_id)
+{
+ struct net_device *ndev = (struct net_device *)dev_id;
+ struct ctucan_priv *priv = netdev_priv(ndev);
+ u32 isr, icr;
+ u32 imask;
+ int irq_loops;
+
+ ctucan_netdev_dbg(ndev, "%s\n", __func__);
+
+ for (irq_loops = 0; irq_loops < 10000; irq_loops++) {
+ /* Get the interrupt status */
+ isr = ctucan_read32(priv, CTUCANFD_INT_STAT);
+
+ if (!isr)
+ return irq_loops ? IRQ_HANDLED : IRQ_NONE;
+
+ /* Receive Buffer Not Empty Interrupt */
+ if (FIELD_GET(REG_INT_STAT_RBNEI, isr)) {
+ ctucan_netdev_dbg(ndev, "RXBNEI\n");
+ /* Mask RXBNEI the first, then clear interrupt and schedule NAPI. Even if
+ * another IRQ fires, RBNEI will always be 0 (masked).
+ */
+ icr = REG_INT_STAT_RBNEI;
+ ctucan_write32(priv, CTUCANFD_INT_MASK_SET, icr);
+ ctucan_write32(priv, CTUCANFD_INT_STAT, icr);
+ napi_schedule(&priv->napi);
+ }
+
+ /* TXT Buffer HW Command Interrupt */
+ if (FIELD_GET(REG_INT_STAT_TXBHCI, isr)) {
+ ctucan_netdev_dbg(ndev, "TXBHCI\n");
+ /* Cleared inside */
+ ctucan_tx_interrupt(ndev);
+ }
+
+ /* Error interrupts */
+ if (FIELD_GET(REG_INT_STAT_EWLI, isr) ||
+ FIELD_GET(REG_INT_STAT_FCSI, isr) ||
+ FIELD_GET(REG_INT_STAT_ALI, isr)) {
+ icr = isr & (REG_INT_STAT_EWLI | REG_INT_STAT_FCSI | REG_INT_STAT_ALI);
+
+ ctucan_netdev_dbg(ndev, "some ERR interrupt: clearing 0x%08x\n", icr);
+ ctucan_write32(priv, CTUCANFD_INT_STAT, icr);
+ ctucan_err_interrupt(ndev, isr);
+ }
+ /* Ignore RI, TI, LFI, RFI, BSI */
+ }
+
+ netdev_err(ndev, "%s: stuck interrupt (isr=0x%08x), stopping\n", __func__, isr);
+
+ if (FIELD_GET(REG_INT_STAT_TXBHCI, isr)) {
+ int i;
+
+ netdev_err(ndev, "txb_head=0x%08x txb_tail=0x%08x\n",
+ priv->txb_head, priv->txb_tail);
+ for (i = 0; i < priv->ntxbufs; i++) {
+ u32 status = ctucan_get_tx_status(priv, i);
+
+ netdev_err(ndev, "txb[%d] txb status=0x%08x\n", i, status);
+ }
+ }
+
+ imask = 0xffffffff;
+ ctucan_write32(priv, CTUCANFD_INT_ENA_CLR, imask);
+ ctucan_write32(priv, CTUCANFD_INT_MASK_SET, imask);
+
+ return IRQ_HANDLED;
+}
+
+/**
+ * ctucan_chip_stop() - Driver stop routine
+ * @ndev: Pointer to net_device structure
+ *
+ * This is the drivers stop routine. It will disable the
+ * interrupts and disable the controller.
+ */
+static void ctucan_chip_stop(struct net_device *ndev)
+{
+ struct ctucan_priv *priv = netdev_priv(ndev);
+ u32 mask = 0xffffffff;
+ u32 mode;
+
+ ctucan_netdev_dbg(ndev, "%s\n", __func__);
+
+ /* Disable interrupts and disable CAN */
+ ctucan_write32(priv, CTUCANFD_INT_ENA_CLR, mask);
+ ctucan_write32(priv, CTUCANFD_INT_MASK_SET, mask);
+ mode = ctucan_read32(priv, CTUCANFD_MODE);
+ mode &= ~REG_MODE_ENA;
+ ctucan_write32(priv, CTUCANFD_MODE, mode);
+
+ priv->can.state = CAN_STATE_STOPPED;
+}
+
+/**
+ * ctucan_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 ctucan_open(struct net_device *ndev)
+{
+ struct ctucan_priv *priv = netdev_priv(ndev);
+ int ret;
+
+ ctucan_netdev_dbg(ndev, "%s\n", __func__);
+
+ 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_noidle(priv->dev);
+ return ret;
+ }
+
+ ret = ctucan_reset(ndev);
+ if (ret < 0)
+ goto err_reset;
+
+ /* Common open */
+ ret = open_candev(ndev);
+ if (ret) {
+ netdev_warn(ndev, "open_candev failed!\n");
+ goto err_open;
+ }
+
+ ret = request_irq(ndev->irq, ctucan_interrupt, priv->irq_flags, ndev->name, ndev);
+ if (ret < 0) {
+ netdev_err(ndev, "irq allocation for CAN failed\n");
+ goto err_irq;
+ }
+
+ ret = ctucan_chip_start(ndev);
+ if (ret < 0) {
+ netdev_err(ndev, "ctucan_chip_start failed!\n");
+ goto err_chip_start;
+ }
+
+ netdev_info(ndev, "ctu_can_fd device registered\n");
+ can_led_event(ndev, CAN_LED_EVENT_OPEN);
+ napi_enable(&priv->napi);
+ netif_start_queue(ndev);
+
+ return 0;
+
+err_chip_start:
+ free_irq(ndev->irq, ndev);
+err_irq:
+ close_candev(ndev);
+err_open:
+err_reset:
+ pm_runtime_put(priv->dev);
+
+ return ret;
+}
+
+/**
+ * ctucan_close() - Driver close routine
+ * @ndev: Pointer to net_device structure
+ *
+ * Return: 0 always
+ */
+static int ctucan_close(struct net_device *ndev)
+{
+ struct ctucan_priv *priv = netdev_priv(ndev);
+
+ ctucan_netdev_dbg(ndev, "%s\n", __func__);
+
+ netif_stop_queue(ndev);
+ napi_disable(&priv->napi);
+ ctucan_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;
+}
+
+/**
+ * ctucan_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 ctucan_get_berr_counter(const struct net_device *ndev, struct can_berr_counter *bec)
+{
+ struct ctucan_priv *priv = netdev_priv(ndev);
+ int ret;
+
+ ctucan_netdev_dbg(ndev, "%s\n", __func__);
+
+ 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_noidle(priv->dev);
+ return ret;
+ }
+
+ ctucan_get_rec_tec(priv, bec);
+ pm_runtime_put(priv->dev);
+
+ return 0;
+}
+
+static const struct net_device_ops ctucan_netdev_ops = {
+ .ndo_open = ctucan_open,
+ .ndo_stop = ctucan_close,
+ .ndo_start_xmit = ctucan_start_xmit,
+ .ndo_change_mtu = can_change_mtu,
+};
+
+int ctucan_suspend(struct device *dev)
+{
+ struct net_device *ndev = dev_get_drvdata(dev);
+ struct ctucan_priv *priv = netdev_priv(ndev);
+
+ ctucan_netdev_dbg(ndev, "%s\n", __func__);
+
+ if (netif_running(ndev)) {
+ netif_stop_queue(ndev);
+ netif_device_detach(ndev);
+ }
+
+ priv->can.state = CAN_STATE_SLEEPING;
+
+ return 0;
+}
+EXPORT_SYMBOL(ctucan_suspend);
+
+int ctucan_resume(struct device *dev)
+{
+ struct net_device *ndev = dev_get_drvdata(dev);
+ struct ctucan_priv *priv = netdev_priv(ndev);
+
+ ctucan_netdev_dbg(ndev, "%s\n", __func__);
+
+ priv->can.state = CAN_STATE_ERROR_ACTIVE;
+
+ if (netif_running(ndev)) {
+ netif_device_attach(ndev);
+ netif_start_queue(ndev);
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(ctucan_resume);
+
+int ctucan_probe_common(struct device *dev, void __iomem *addr, int irq, unsigned int ntxbufs,
+ unsigned long can_clk_rate, int pm_enable_call,
+ void (*set_drvdata_fnc)(struct device *dev, struct net_device *ndev))
+{
+ struct ctucan_priv *priv;
+ struct net_device *ndev;
+ int ret;
+
+ /* Create a CAN device instance */
+ ndev = alloc_candev(sizeof(struct ctucan_priv), ntxbufs);
+ if (!ndev)
+ return -ENOMEM;
+
+ priv = netdev_priv(ndev);
+ spin_lock_init(&priv->tx_lock);
+ INIT_LIST_HEAD(&priv->peers_on_pdev);
+ priv->ntxbufs = ntxbufs;
+ priv->dev = dev;
+ priv->can.bittiming_const = &ctu_can_fd_bit_timing_max;
+ priv->can.data_bittiming_const = &ctu_can_fd_bit_timing_data_max;
+ priv->can.do_set_mode = ctucan_do_set_mode;
+
+ /* Needed for timing adjustment to be performed as soon as possible */
+ priv->can.do_set_bittiming = ctucan_set_bittiming;
+ priv->can.do_set_data_bittiming = ctucan_set_data_bittiming;
+
+ priv->can.do_get_berr_counter = ctucan_get_berr_counter;
+ priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK
+ | CAN_CTRLMODE_LISTENONLY
+ | CAN_CTRLMODE_FD
+ | CAN_CTRLMODE_PRESUME_ACK
+ | CAN_CTRLMODE_BERR_REPORTING
+ | CAN_CTRLMODE_FD_NON_ISO
+ | CAN_CTRLMODE_ONE_SHOT;
+ priv->mem_base = addr;
+
+ /* Get IRQ for the device */
+ ndev->irq = irq;
+ ndev->flags |= IFF_ECHO; /* We support local echo */
+
+ if (set_drvdata_fnc)
+ set_drvdata_fnc(dev, ndev);
+ SET_NETDEV_DEV(ndev, dev);
+ ndev->netdev_ops = &ctucan_netdev_ops;
+
+ /* Getting the can_clk info */
+ if (!can_clk_rate) {
+ priv->can_clk = devm_clk_get(dev, NULL);
+ if (IS_ERR(priv->can_clk)) {
+ dev_err(dev, "Device clock not found.\n");
+ ret = PTR_ERR(priv->can_clk);
+ goto err_free;
+ }
+ can_clk_rate = clk_get_rate(priv->can_clk);
+ }
+
+ priv->write_reg = ctucan_write32_le;
+ priv->read_reg = ctucan_read32_le;
+
+ if (pm_enable_call)
+ pm_runtime_enable(dev);
+ ret = pm_runtime_get_sync(dev);
+ if (ret < 0) {
+ netdev_err(ndev, "%s: pm_runtime_get failed(%d)\n",
+ __func__, ret);
+ pm_runtime_put_noidle(priv->dev);
+ goto err_pmdisable;
+ }
+
+ /* Check for big-endianity and set according IO-accessors */
+ if ((ctucan_read32(priv, CTUCANFD_DEVICE_ID) & 0xFFFF) != CTUCANFD_ID) {
+ priv->write_reg = ctucan_write32_be;
+ priv->read_reg = ctucan_read32_be;
+ if ((ctucan_read32(priv, CTUCANFD_DEVICE_ID) & 0xFFFF) != CTUCANFD_ID) {
+ netdev_err(ndev, "CTU_CAN_FD signature not found\n");
+ ret = -ENODEV;
+ goto err_deviceoff;
+ }
+ }
+
+ ret = ctucan_reset(ndev);
+ if (ret < 0)
+ goto err_deviceoff;
+
+ priv->can.clock.freq = can_clk_rate;
+
+ netif_napi_add(ndev, &priv->napi, ctucan_rx_poll, NAPI_POLL_WEIGHT);
+
+ ret = register_candev(ndev);
+ if (ret) {
+ dev_err(dev, "fail to register failed (err=%d)\n", ret);
+ goto err_deviceoff;
+ }
+
+ devm_can_led_init(ndev);
+
+ pm_runtime_put(dev);
+
+ netdev_dbg(ndev, "mem_base=0x%p irq=%d clock=%d, no. of txt buffers:%d\n",
+ priv->mem_base, ndev->irq, priv->can.clock.freq, priv->ntxbufs);
+
+ return 0;
+
+err_deviceoff:
+ pm_runtime_put(priv->dev);
+err_pmdisable:
+ if (pm_enable_call)
+ pm_runtime_disable(dev);
+err_free:
+ list_del_init(&priv->peers_on_pdev);
+ free_candev(ndev);
+ return ret;
+}
+EXPORT_SYMBOL(ctucan_probe_common);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Martin Jerabek <martin.jerabek01@...il.com>");
+MODULE_AUTHOR("Pavel Pisa <pisa@....felk.cvut.cz>");
+MODULE_AUTHOR("Ondrej Ille <ondrej.ille@...il.com>");
+MODULE_DESCRIPTION("CTU CAN FD interface");
diff --git a/drivers/net/can/ctucanfd/ctucanfd_kframe.h b/drivers/net/can/ctucanfd/ctucanfd_kframe.h
new file mode 100644
index 000000000000..3491299eaac2
--- /dev/null
+++ b/drivers/net/can/ctucanfd/ctucanfd_kframe.h
@@ -0,0 +1,77 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*******************************************************************************
+ *
+ * CTU CAN FD IP Core
+ *
+ * Copyright (C) 2015-2018 Ondrej Ille <ondrej.ille@...il.com> FEE CTU
+ * Copyright (C) 2018-2021 Ondrej Ille <ondrej.ille@...il.com> self-funded
+ * Copyright (C) 2018-2019 Martin Jerabek <martin.jerabek01@...il.com> FEE CTU
+ * Copyright (C) 2018-2021 Pavel Pisa <pisa@....felk.cvut.cz> FEE CTU/self-funded
+ *
+ * Project advisors:
+ * Jiri Novak <jnovak@....cvut.cz>
+ * Pavel Pisa <pisa@....felk.cvut.cz>
+ *
+ * Department of Measurement (http://meas.fel.cvut.cz/)
+ * Faculty of Electrical Engineering (http://www.fel.cvut.cz)
+ * Czech Technical University (http://www.cvut.cz/)
+ ******************************************************************************/
+
+/* This file is autogenerated, DO NOT EDIT! */
+
+#ifndef __CTU_CAN_FD_CAN_FD_FRAME_FORMAT__
+#define __CTU_CAN_FD_CAN_FD_FRAME_FORMAT__
+
+#include <linux/bits.h>
+
+/* CAN_Frame_format memory map */
+enum ctu_can_fd_can_frame_format {
+ CTUCANFD_FRAME_FORMAT_W = 0x0,
+ CTUCANFD_IDENTIFIER_W = 0x4,
+ CTUCANFD_TIMESTAMP_L_W = 0x8,
+ CTUCANFD_TIMESTAMP_U_W = 0xc,
+ CTUCANFD_DATA_1_4_W = 0x10,
+ CTUCANFD_DATA_5_8_W = 0x14,
+ CTUCANFD_DATA_61_64_W = 0x4c,
+};
+
+/* CAN_FD_Frame_format memory region */
+
+/* FRAME_FORMAT_W registers */
+#define REG_FRAME_FORMAT_W_DLC GENMASK(3, 0)
+#define REG_FRAME_FORMAT_W_RTR BIT(5)
+#define REG_FRAME_FORMAT_W_IDE BIT(6)
+#define REG_FRAME_FORMAT_W_FDF BIT(7)
+#define REG_FRAME_FORMAT_W_BRS BIT(9)
+#define REG_FRAME_FORMAT_W_ESI_RSV BIT(10)
+#define REG_FRAME_FORMAT_W_RWCNT GENMASK(15, 11)
+
+/* IDENTIFIER_W registers */
+#define REG_IDENTIFIER_W_IDENTIFIER_EXT GENMASK(17, 0)
+#define REG_IDENTIFIER_W_IDENTIFIER_BASE GENMASK(28, 18)
+
+/* TIMESTAMP_L_W registers */
+#define REG_TIMESTAMP_L_W_TIME_STAMP_L_W GENMASK(31, 0)
+
+/* TIMESTAMP_U_W registers */
+#define REG_TIMESTAMP_U_W_TIMESTAMP_U_W GENMASK(31, 0)
+
+/* DATA_1_4_W registers */
+#define REG_DATA_1_4_W_DATA_1 GENMASK(7, 0)
+#define REG_DATA_1_4_W_DATA_2 GENMASK(15, 8)
+#define REG_DATA_1_4_W_DATA_3 GENMASK(23, 16)
+#define REG_DATA_1_4_W_DATA_4 GENMASK(31, 24)
+
+/* DATA_5_8_W registers */
+#define REG_DATA_5_8_W_DATA_5 GENMASK(7, 0)
+#define REG_DATA_5_8_W_DATA_6 GENMASK(15, 8)
+#define REG_DATA_5_8_W_DATA_7 GENMASK(23, 16)
+#define REG_DATA_5_8_W_DATA_8 GENMASK(31, 24)
+
+/* DATA_61_64_W registers */
+#define REG_DATA_61_64_W_DATA_61 GENMASK(7, 0)
+#define REG_DATA_61_64_W_DATA_62 GENMASK(15, 8)
+#define REG_DATA_61_64_W_DATA_63 GENMASK(23, 16)
+#define REG_DATA_61_64_W_DATA_64 GENMASK(31, 24)
+
+#endif
diff --git a/drivers/net/can/ctucanfd/ctucanfd_kregs.h b/drivers/net/can/ctucanfd/ctucanfd_kregs.h
new file mode 100644
index 000000000000..edc1c1a24348
--- /dev/null
+++ b/drivers/net/can/ctucanfd/ctucanfd_kregs.h
@@ -0,0 +1,325 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*******************************************************************************
+ *
+ * CTU CAN FD IP Core
+ *
+ * Copyright (C) 2015-2018 Ondrej Ille <ondrej.ille@...il.com> FEE CTU
+ * Copyright (C) 2018-2021 Ondrej Ille <ondrej.ille@...il.com> self-funded
+ * Copyright (C) 2018-2019 Martin Jerabek <martin.jerabek01@...il.com> FEE CTU
+ * Copyright (C) 2018-2021 Pavel Pisa <pisa@....felk.cvut.cz> FEE CTU/self-funded
+ *
+ * Project advisors:
+ * Jiri Novak <jnovak@....cvut.cz>
+ * Pavel Pisa <pisa@....felk.cvut.cz>
+ *
+ * Department of Measurement (http://meas.fel.cvut.cz/)
+ * Faculty of Electrical Engineering (http://www.fel.cvut.cz)
+ * Czech Technical University (http://www.cvut.cz/)
+ ******************************************************************************/
+
+/* This file is autogenerated, DO NOT EDIT! */
+
+#ifndef __CTU_CAN_FD_CAN_FD_REGISTER_MAP__
+#define __CTU_CAN_FD_CAN_FD_REGISTER_MAP__
+
+#include <linux/bits.h>
+
+/* CAN_Registers memory map */
+enum ctu_can_fd_can_registers {
+ CTUCANFD_DEVICE_ID = 0x0,
+ CTUCANFD_VERSION = 0x2,
+ CTUCANFD_MODE = 0x4,
+ CTUCANFD_SETTINGS = 0x6,
+ CTUCANFD_STATUS = 0x8,
+ CTUCANFD_COMMAND = 0xc,
+ CTUCANFD_INT_STAT = 0x10,
+ CTUCANFD_INT_ENA_SET = 0x14,
+ CTUCANFD_INT_ENA_CLR = 0x18,
+ CTUCANFD_INT_MASK_SET = 0x1c,
+ CTUCANFD_INT_MASK_CLR = 0x20,
+ CTUCANFD_BTR = 0x24,
+ CTUCANFD_BTR_FD = 0x28,
+ CTUCANFD_EWL = 0x2c,
+ CTUCANFD_ERP = 0x2d,
+ CTUCANFD_FAULT_STATE = 0x2e,
+ CTUCANFD_REC = 0x30,
+ CTUCANFD_TEC = 0x32,
+ CTUCANFD_ERR_NORM = 0x34,
+ CTUCANFD_ERR_FD = 0x36,
+ CTUCANFD_CTR_PRES = 0x38,
+ CTUCANFD_FILTER_A_MASK = 0x3c,
+ CTUCANFD_FILTER_A_VAL = 0x40,
+ CTUCANFD_FILTER_B_MASK = 0x44,
+ CTUCANFD_FILTER_B_VAL = 0x48,
+ CTUCANFD_FILTER_C_MASK = 0x4c,
+ CTUCANFD_FILTER_C_VAL = 0x50,
+ CTUCANFD_FILTER_RAN_LOW = 0x54,
+ CTUCANFD_FILTER_RAN_HIGH = 0x58,
+ CTUCANFD_FILTER_CONTROL = 0x5c,
+ CTUCANFD_FILTER_STATUS = 0x5e,
+ CTUCANFD_RX_MEM_INFO = 0x60,
+ CTUCANFD_RX_POINTERS = 0x64,
+ CTUCANFD_RX_STATUS = 0x68,
+ CTUCANFD_RX_SETTINGS = 0x6a,
+ CTUCANFD_RX_DATA = 0x6c,
+ CTUCANFD_TX_STATUS = 0x70,
+ CTUCANFD_TX_COMMAND = 0x74,
+ CTUCANFD_TX_PRIORITY = 0x78,
+ CTUCANFD_ERR_CAPT = 0x7c,
+ CTUCANFD_ALC = 0x7e,
+ CTUCANFD_TRV_DELAY = 0x80,
+ CTUCANFD_SSP_CFG = 0x82,
+ CTUCANFD_RX_FR_CTR = 0x84,
+ CTUCANFD_TX_FR_CTR = 0x88,
+ CTUCANFD_DEBUG_REGISTER = 0x8c,
+ CTUCANFD_YOLO_REG = 0x90,
+ CTUCANFD_TIMESTAMP_LOW = 0x94,
+ CTUCANFD_TIMESTAMP_HIGH = 0x98,
+ CTUCANFD_TXTB1_DATA_1 = 0x100,
+ CTUCANFD_TXTB1_DATA_2 = 0x104,
+ CTUCANFD_TXTB1_DATA_20 = 0x14c,
+ CTUCANFD_TXTB2_DATA_1 = 0x200,
+ CTUCANFD_TXTB2_DATA_2 = 0x204,
+ CTUCANFD_TXTB2_DATA_20 = 0x24c,
+ CTUCANFD_TXTB3_DATA_1 = 0x300,
+ CTUCANFD_TXTB3_DATA_2 = 0x304,
+ CTUCANFD_TXTB3_DATA_20 = 0x34c,
+ CTUCANFD_TXTB4_DATA_1 = 0x400,
+ CTUCANFD_TXTB4_DATA_2 = 0x404,
+ CTUCANFD_TXTB4_DATA_20 = 0x44c,
+};
+
+/* Control_registers memory region */
+
+/* DEVICE_ID VERSION registers */
+#define REG_DEVICE_ID_DEVICE_ID GENMASK(15, 0)
+#define REG_DEVICE_ID_VER_MINOR GENMASK(23, 16)
+#define REG_DEVICE_ID_VER_MAJOR GENMASK(31, 24)
+
+/* MODE SETTINGS registers */
+#define REG_MODE_RST BIT(0)
+#define REG_MODE_BMM BIT(1)
+#define REG_MODE_STM BIT(2)
+#define REG_MODE_AFM BIT(3)
+#define REG_MODE_FDE BIT(4)
+#define REG_MODE_ACF BIT(7)
+#define REG_MODE_TSTM BIT(8)
+#define REG_MODE_RTRLE BIT(16)
+#define REG_MODE_RTRTH GENMASK(20, 17)
+#define REG_MODE_ILBP BIT(21)
+#define REG_MODE_ENA BIT(22)
+#define REG_MODE_NISOFD BIT(23)
+#define REG_MODE_PEX BIT(24)
+#define REG_MODE_TBFBO BIT(25)
+#define REG_MODE_FDRF BIT(26)
+
+/* STATUS registers */
+#define REG_STATUS_RXNE BIT(0)
+#define REG_STATUS_DOR BIT(1)
+#define REG_STATUS_TXNF BIT(2)
+#define REG_STATUS_EFT BIT(3)
+#define REG_STATUS_RXS BIT(4)
+#define REG_STATUS_TXS BIT(5)
+#define REG_STATUS_EWL BIT(6)
+#define REG_STATUS_IDLE BIT(7)
+#define REG_STATUS_PEXS BIT(8)
+
+/* COMMAND registers */
+#define REG_COMMAND_RRB BIT(2)
+#define REG_COMMAND_CDO BIT(3)
+#define REG_COMMAND_ERCRST BIT(4)
+#define REG_COMMAND_RXFCRST BIT(5)
+#define REG_COMMAND_TXFCRST BIT(6)
+#define REG_COMMAND_CPEXS BIT(7)
+
+/* INT_STAT registers */
+#define REG_INT_STAT_RXI BIT(0)
+#define REG_INT_STAT_TXI BIT(1)
+#define REG_INT_STAT_EWLI BIT(2)
+#define REG_INT_STAT_DOI BIT(3)
+#define REG_INT_STAT_FCSI BIT(4)
+#define REG_INT_STAT_ALI BIT(5)
+#define REG_INT_STAT_BEI BIT(6)
+#define REG_INT_STAT_OFI BIT(7)
+#define REG_INT_STAT_RXFI BIT(8)
+#define REG_INT_STAT_BSI BIT(9)
+#define REG_INT_STAT_RBNEI BIT(10)
+#define REG_INT_STAT_TXBHCI BIT(11)
+
+/* INT_ENA_SET registers */
+#define REG_INT_ENA_SET_INT_ENA_SET GENMASK(11, 0)
+
+/* INT_ENA_CLR registers */
+#define REG_INT_ENA_CLR_INT_ENA_CLR GENMASK(11, 0)
+
+/* INT_MASK_SET registers */
+#define REG_INT_MASK_SET_INT_MASK_SET GENMASK(11, 0)
+
+/* INT_MASK_CLR registers */
+#define REG_INT_MASK_CLR_INT_MASK_CLR GENMASK(11, 0)
+
+/* BTR registers */
+#define REG_BTR_PROP GENMASK(6, 0)
+#define REG_BTR_PH1 GENMASK(12, 7)
+#define REG_BTR_PH2 GENMASK(18, 13)
+#define REG_BTR_BRP GENMASK(26, 19)
+#define REG_BTR_SJW GENMASK(31, 27)
+
+/* BTR_FD registers */
+#define REG_BTR_FD_PROP_FD GENMASK(5, 0)
+#define REG_BTR_FD_PH1_FD GENMASK(11, 7)
+#define REG_BTR_FD_PH2_FD GENMASK(17, 13)
+#define REG_BTR_FD_BRP_FD GENMASK(26, 19)
+#define REG_BTR_FD_SJW_FD GENMASK(31, 27)
+
+/* EWL ERP FAULT_STATE registers */
+#define REG_EWL_EW_LIMIT GENMASK(7, 0)
+#define REG_EWL_ERP_LIMIT GENMASK(15, 8)
+#define REG_EWL_ERA BIT(16)
+#define REG_EWL_ERP BIT(17)
+#define REG_EWL_BOF BIT(18)
+
+/* REC TEC registers */
+#define REG_REC_REC_VAL GENMASK(8, 0)
+#define REG_REC_TEC_VAL GENMASK(24, 16)
+
+/* ERR_NORM ERR_FD registers */
+#define REG_ERR_NORM_ERR_NORM_VAL GENMASK(15, 0)
+#define REG_ERR_NORM_ERR_FD_VAL GENMASK(31, 16)
+
+/* CTR_PRES registers */
+#define REG_CTR_PRES_CTPV GENMASK(8, 0)
+#define REG_CTR_PRES_PTX BIT(9)
+#define REG_CTR_PRES_PRX BIT(10)
+#define REG_CTR_PRES_ENORM BIT(11)
+#define REG_CTR_PRES_EFD BIT(12)
+
+/* FILTER_A_MASK registers */
+#define REG_FILTER_A_MASK_BIT_MASK_A_VAL GENMASK(28, 0)
+
+/* FILTER_A_VAL registers */
+#define REG_FILTER_A_VAL_BIT_VAL_A_VAL GENMASK(28, 0)
+
+/* FILTER_B_MASK registers */
+#define REG_FILTER_B_MASK_BIT_MASK_B_VAL GENMASK(28, 0)
+
+/* FILTER_B_VAL registers */
+#define REG_FILTER_B_VAL_BIT_VAL_B_VAL GENMASK(28, 0)
+
+/* FILTER_C_MASK registers */
+#define REG_FILTER_C_MASK_BIT_MASK_C_VAL GENMASK(28, 0)
+
+/* FILTER_C_VAL registers */
+#define REG_FILTER_C_VAL_BIT_VAL_C_VAL GENMASK(28, 0)
+
+/* FILTER_RAN_LOW registers */
+#define REG_FILTER_RAN_LOW_BIT_RAN_LOW_VAL GENMASK(28, 0)
+
+/* FILTER_RAN_HIGH registers */
+#define REG_FILTER_RAN_HIGH_BIT_RAN_HIGH_VAL GENMASK(28, 0)
+
+/* FILTER_CONTROL FILTER_STATUS registers */
+#define REG_FILTER_CONTROL_FANB BIT(0)
+#define REG_FILTER_CONTROL_FANE BIT(1)
+#define REG_FILTER_CONTROL_FAFB BIT(2)
+#define REG_FILTER_CONTROL_FAFE BIT(3)
+#define REG_FILTER_CONTROL_FBNB BIT(4)
+#define REG_FILTER_CONTROL_FBNE BIT(5)
+#define REG_FILTER_CONTROL_FBFB BIT(6)
+#define REG_FILTER_CONTROL_FBFE BIT(7)
+#define REG_FILTER_CONTROL_FCNB BIT(8)
+#define REG_FILTER_CONTROL_FCNE BIT(9)
+#define REG_FILTER_CONTROL_FCFB BIT(10)
+#define REG_FILTER_CONTROL_FCFE BIT(11)
+#define REG_FILTER_CONTROL_FRNB BIT(12)
+#define REG_FILTER_CONTROL_FRNE BIT(13)
+#define REG_FILTER_CONTROL_FRFB BIT(14)
+#define REG_FILTER_CONTROL_FRFE BIT(15)
+#define REG_FILTER_CONTROL_SFA BIT(16)
+#define REG_FILTER_CONTROL_SFB BIT(17)
+#define REG_FILTER_CONTROL_SFC BIT(18)
+#define REG_FILTER_CONTROL_SFR BIT(19)
+
+/* RX_MEM_INFO registers */
+#define REG_RX_MEM_INFO_RX_BUFF_SIZE GENMASK(12, 0)
+#define REG_RX_MEM_INFO_RX_MEM_FREE GENMASK(28, 16)
+
+/* RX_POINTERS registers */
+#define REG_RX_POINTERS_RX_WPP GENMASK(11, 0)
+#define REG_RX_POINTERS_RX_RPP GENMASK(27, 16)
+
+/* RX_STATUS RX_SETTINGS registers */
+#define REG_RX_STATUS_RXE BIT(0)
+#define REG_RX_STATUS_RXF BIT(1)
+#define REG_RX_STATUS_RXMOF BIT(2)
+#define REG_RX_STATUS_RXFRC GENMASK(14, 4)
+#define REG_RX_STATUS_RTSOP BIT(16)
+
+/* RX_DATA registers */
+#define REG_RX_DATA_RX_DATA GENMASK(31, 0)
+
+/* TX_STATUS registers */
+#define REG_TX_STATUS_TX1S GENMASK(3, 0)
+#define REG_TX_STATUS_TX2S GENMASK(7, 4)
+#define REG_TX_STATUS_TX3S GENMASK(11, 8)
+#define REG_TX_STATUS_TX4S GENMASK(15, 12)
+
+/* TX_COMMAND registers */
+#define REG_TX_COMMAND_TXCE BIT(0)
+#define REG_TX_COMMAND_TXCR BIT(1)
+#define REG_TX_COMMAND_TXCA BIT(2)
+#define REG_TX_COMMAND_TXB1 BIT(8)
+#define REG_TX_COMMAND_TXB2 BIT(9)
+#define REG_TX_COMMAND_TXB3 BIT(10)
+#define REG_TX_COMMAND_TXB4 BIT(11)
+
+/* TX_PRIORITY registers */
+#define REG_TX_PRIORITY_TXT1P GENMASK(2, 0)
+#define REG_TX_PRIORITY_TXT2P GENMASK(6, 4)
+#define REG_TX_PRIORITY_TXT3P GENMASK(10, 8)
+#define REG_TX_PRIORITY_TXT4P GENMASK(14, 12)
+
+/* ERR_CAPT ALC registers */
+#define REG_ERR_CAPT_ERR_POS GENMASK(4, 0)
+#define REG_ERR_CAPT_ERR_TYPE GENMASK(7, 5)
+#define REG_ERR_CAPT_ALC_BIT GENMASK(20, 16)
+#define REG_ERR_CAPT_ALC_ID_FIELD GENMASK(23, 21)
+
+/* TRV_DELAY SSP_CFG registers */
+#define REG_TRV_DELAY_TRV_DELAY_VALUE GENMASK(6, 0)
+#define REG_TRV_DELAY_SSP_OFFSET GENMASK(23, 16)
+#define REG_TRV_DELAY_SSP_SRC GENMASK(25, 24)
+
+/* RX_FR_CTR registers */
+#define REG_RX_FR_CTR_RX_FR_CTR_VAL GENMASK(31, 0)
+
+/* TX_FR_CTR registers */
+#define REG_TX_FR_CTR_TX_FR_CTR_VAL GENMASK(31, 0)
+
+/* DEBUG_REGISTER registers */
+#define REG_DEBUG_REGISTER_STUFF_COUNT GENMASK(2, 0)
+#define REG_DEBUG_REGISTER_DESTUFF_COUNT GENMASK(5, 3)
+#define REG_DEBUG_REGISTER_PC_ARB BIT(6)
+#define REG_DEBUG_REGISTER_PC_CON BIT(7)
+#define REG_DEBUG_REGISTER_PC_DAT BIT(8)
+#define REG_DEBUG_REGISTER_PC_STC BIT(9)
+#define REG_DEBUG_REGISTER_PC_CRC BIT(10)
+#define REG_DEBUG_REGISTER_PC_CRCD BIT(11)
+#define REG_DEBUG_REGISTER_PC_ACK BIT(12)
+#define REG_DEBUG_REGISTER_PC_ACKD BIT(13)
+#define REG_DEBUG_REGISTER_PC_EOF BIT(14)
+#define REG_DEBUG_REGISTER_PC_INT BIT(15)
+#define REG_DEBUG_REGISTER_PC_SUSP BIT(16)
+#define REG_DEBUG_REGISTER_PC_OVR BIT(17)
+#define REG_DEBUG_REGISTER_PC_SOF BIT(18)
+
+/* YOLO_REG registers */
+#define REG_YOLO_REG_YOLO_VAL GENMASK(31, 0)
+
+/* TIMESTAMP_LOW registers */
+#define REG_TIMESTAMP_LOW_TIMESTAMP_LOW GENMASK(31, 0)
+
+/* TIMESTAMP_HIGH registers */
+#define REG_TIMESTAMP_HIGH_TIMESTAMP_HIGH GENMASK(31, 0)
+
+#endif
--
2.35.1
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