From patchwork Thu Jan 23 09:11:12 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ming Yu X-Patchwork-Id: 13948028 X-Patchwork-Delegate: kuba@kernel.org Received: from mail-pl1-f174.google.com (mail-pl1-f174.google.com [209.85.214.174]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 81E8220E315; Thu, 23 Jan 2025 09:12:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.174 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1737623523; cv=none; b=Vi6c+Hn/2O7PEehIulPqURb6rSH7lvULLimR95KZQSz44gH5xsFsGfdFOxIPsRRMl2pLcEvcYxL4dGv2I96NuSjfvO/w9zBh8HKS6TzKsTas2CiJp6Q8iKDD4PDSvpEhfpeBZIlJ+K+KcYvbTxcykDg4YVymmIbKK2LsOL2luRE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1737623523; c=relaxed/simple; bh=/h4Myvxz+XixXATNk+ZvaxNgLT6BIB0bTE89TEWDgxU=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=gG5ReTJVl/QmmhUvy4dM5q2BzppW7iB95HhlKAuJgbNXo+MzffgTkFp8yGhDTDChofIVo9KyxjQMtVldUz3RFO7wodGyDqDn2ya8QGhxfrZuEz/0uibhDFQfiqSVMPumjm65SoGSUCrkVwUIEfUC8+nO/cpeNUsYQDCrMhAn+qU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=EwUF9YLA; arc=none smtp.client-ip=209.85.214.174 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="EwUF9YLA" Received: by mail-pl1-f174.google.com with SMTP id d9443c01a7336-21680814d42so10103695ad.2; Thu, 23 Jan 2025 01:12:01 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1737623520; x=1738228320; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=1sU+cwZ2ji3njMzao5QI+HwWqAIc+49Ex5r+oMqGHko=; b=EwUF9YLAU2e4DHhsISS/3VMqLIXDtFAArLlfBXtioviwntY6xIsah0xp6t97PcYms+ Z+EpsnJdensOSemRw2AVT3a99wyNpXNXiXiX0Va8I2gh4hmYT9b8lkOIB1hOcbEeKVsi bIWzGUbCsEKBXSXcS4IGfsjL+tZEosHMOuvvr9AjE9IpPODAhicnRGWHimosPnXvwhGb UpnJRyhceDvfP/CPbqMvl2kfsMMjRK/E69ocC/BrPIQ7H+bm9smrcH2fhX/ggK8XM/fE dJp2ryU7heN37swHTHp72811uQSSZlB3PsWoXVcrpHIWfnk/EJivK7vzq1jKJBjTxANE K9Eg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1737623520; x=1738228320; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=1sU+cwZ2ji3njMzao5QI+HwWqAIc+49Ex5r+oMqGHko=; b=Wj8bByDlO6l3bT/7/VE9La7Ex0EM6gpMw/aBW7m/tjYU2rDsqF9xptFwh9g7xw1NV7 zytWrT44b5gbnQrYqy5oiuRmL3t4uTEbmnwj4tqzLpdw+t3yJRiFY18MvLkXJMm7AVEa BxsFFpBSjZm7u3HLvplynsNYdGk/8SwBUUw+tgmVzNyEPWrGBCPsihe1fYcJcoQL5eai O2syzmTXrN7Pv+pkoGVSGRugNE+7OCT6p9ARAILvpN1ou5TSSFVQk5C3QpaP5hJREcVq 3IZLL3xSY6gzZOodwVzPB6y7GhSzE0bpJ2G+ZcoQ9b0Yj9vN6CS48kmxdXbRktIrHNnA LfPQ== X-Forwarded-Encrypted: i=1; AJvYcCU+1eJ/CrmpohuWyTfnI+Xyzr+cp2j3wyVDgVR2qcSut42CKFHZ5QBbdbPwCurthSxtzIYRL4WE0kA=@vger.kernel.org, AJvYcCUGo2rpZWt2gMSCihwGVMFaOw/EdJQPS3DKG89HlmKlqYwVbMhf1dyoMce2GXKgI8sw29qjeFbKEL0h@vger.kernel.org, AJvYcCV+iEhtWI7EafsfnJJY7J3Tc1qYciyP4jsNieB3LCaap3qafQjIEZDwhMHXqhC899YY2DUNIIYo//Yd@vger.kernel.org, AJvYcCV477dSZZU6rjgyoQOibsqN04SDxl2lIkIOfDROXiFN9pDH0uSHN70PBoGxJkONQmk9+2tNNpAhuv51tw==@vger.kernel.org, AJvYcCVHuxCrb1klDJ/3gLBpzIACxwSINotqsbwwa2dJOP3HxW9Lmx4JHx9QWblJ8uToA+f5HcIL1ofl@vger.kernel.org, AJvYcCVJFxwZJf1mAORVjD3Ky8hXLlShTuJ9QJw3envaci71YdMJOpqjmuLjVBwNsahKFZoWv4oqqKVrNiPh+7IaRU0=@vger.kernel.org, AJvYcCX4A3Y7KdcJ7ec4Ad+elkSSAfPI7g/wcWLkt3Fjb7oBXDv4lkrv0gs93PqfSlHRX5ep4U9WMO+yjTfF@vger.kernel.org, AJvYcCXrRQ+UwWHzJnhgSNTEmqgRMyfJ/gLrjsve9wtH5bjc7xr7dDkkMOOTt7Y6woiTFunfgJemY79dxaGaEB0=@vger.kernel.org X-Gm-Message-State: AOJu0YwmelZYKnOKHTockxoQqm/fHnykAB1MynQuvJCmzz7SzuJTOCZZ h2fzJWW2XcbNTuQD0RQQqePNiD6DsjZGCiXhssdvy0oOkFmAFKZ8juB0Pg== X-Gm-Gg: ASbGncubY1ZKy1ZksoT06draynYeSvnDLoat1MBvHYdfb03dGL7Zt7fliAmL69JPfCl oAkZDGc+umZxIK+3QfA9IgTjzOuqPpQubs16B8x209jgK68F+zfR4R70pAXMFt6Kg/qAiPbVBFn L2chlptj8wQUb3kddOhbfPOpZeED5BfvFK9E5aeXYVkijrsh676WbYKnwsKYiFeBkgV3Tivt/1x iWhYxxP+GmaMEQYyHbVEKUml9TRGyMC6c7XFD3mkb0Khpma+g7CBuWRaREeGgxI5fBdavXiqfBb OCJXDzTxb0dYtjcm1YjXFH2UwyFNF4dXMlUE7B+nkOuwWCW+ X-Google-Smtp-Source: AGHT+IHtow+mfLoCKBeOjamIpyMgDb9vuPn3r8pQcsaTpARwRaYmeEMgh94OoT4XGGagCAIzATQJ+A== X-Received: by 2002:a17:903:32c1:b0:21b:d126:6d30 with SMTP id d9443c01a7336-21c355c433amr344690845ad.33.1737623520429; Thu, 23 Jan 2025 01:12:00 -0800 (PST) Received: from hcdev-d520mt2.. (60-250-196-139.hinet-ip.hinet.net. [60.250.196.139]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-21c2ceb735esm109365365ad.64.2025.01.23.01.11.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 23 Jan 2025 01:12:00 -0800 (PST) From: Ming Yu To: tmyu0@nuvoton.com, lee@kernel.org, linus.walleij@linaro.org, brgl@bgdev.pl, andi.shyti@kernel.org, mkl@pengutronix.de, mailhol.vincent@wanadoo.fr, andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, wim@linux-watchdog.org, linux@roeck-us.net, jdelvare@suse.com, alexandre.belloni@bootlin.com Cc: linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org, linux-i2c@vger.kernel.org, linux-can@vger.kernel.org, netdev@vger.kernel.org, linux-watchdog@vger.kernel.org, linux-hwmon@vger.kernel.org, linux-rtc@vger.kernel.org, linux-usb@vger.kernel.org, Ming Yu Subject: [PATCH v6 4/7] can: Add Nuvoton NCT6694 CANFD support Date: Thu, 23 Jan 2025 17:11:12 +0800 Message-Id: <20250123091115.2079802-5-a0282524688@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20250123091115.2079802-1-a0282524688@gmail.com> References: <20250123091115.2079802-1-a0282524688@gmail.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: kuba@kernel.org This driver supports Socket CANFD functionality for NCT6694 MFD device based on USB interface. Signed-off-by: Ming Yu --- MAINTAINERS | 1 + drivers/net/can/usb/Kconfig | 11 + drivers/net/can/usb/Makefile | 1 + drivers/net/can/usb/nct6694_canfd.c | 813 ++++++++++++++++++++++++++++ 4 files changed, 826 insertions(+) create mode 100644 drivers/net/can/usb/nct6694_canfd.c diff --git a/MAINTAINERS b/MAINTAINERS index f930252ad132..3196f87c547d 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -16808,6 +16808,7 @@ S: Supported F: drivers/gpio/gpio-nct6694.c F: drivers/i2c/busses/i2c-nct6694.c F: drivers/mfd/nct6694.c +F: drivers/net/can/usb/nct6694_canfd.c F: include/linux/mfd/nct6694.h NVIDIA (rivafb and nvidiafb) FRAMEBUFFER DRIVER diff --git a/drivers/net/can/usb/Kconfig b/drivers/net/can/usb/Kconfig index 9dae0c71a2e1..759e724a67cf 100644 --- a/drivers/net/can/usb/Kconfig +++ b/drivers/net/can/usb/Kconfig @@ -133,6 +133,17 @@ config CAN_MCBA_USB This driver supports the CAN BUS Analyzer interface from Microchip (http://www.microchip.com/development-tools/). +config CAN_NCT6694 + tristate "Nuvoton NCT6694 Socket CANfd support" + depends on MFD_NCT6694 + select CAN_RX_OFFLOAD + help + If you say yes to this option, support will be included for Nuvoton + NCT6694, a USB device to socket CANfd controller. + + This driver can also be built as a module. If so, the module will + be called nct6694_canfd. + config CAN_PEAK_USB tristate "PEAK PCAN-USB/USB Pro interfaces for CAN 2.0b/CAN-FD" help diff --git a/drivers/net/can/usb/Makefile b/drivers/net/can/usb/Makefile index 8b11088e9a59..fcafb1ac262e 100644 --- a/drivers/net/can/usb/Makefile +++ b/drivers/net/can/usb/Makefile @@ -11,5 +11,6 @@ obj-$(CONFIG_CAN_F81604) += f81604.o obj-$(CONFIG_CAN_GS_USB) += gs_usb.o obj-$(CONFIG_CAN_KVASER_USB) += kvaser_usb/ obj-$(CONFIG_CAN_MCBA_USB) += mcba_usb.o +obj-$(CONFIG_CAN_NCT6694) += nct6694_canfd.o obj-$(CONFIG_CAN_PEAK_USB) += peak_usb/ obj-$(CONFIG_CAN_UCAN) += ucan.o diff --git a/drivers/net/can/usb/nct6694_canfd.c b/drivers/net/can/usb/nct6694_canfd.c new file mode 100644 index 000000000000..56d729b438f3 --- /dev/null +++ b/drivers/net/can/usb/nct6694_canfd.c @@ -0,0 +1,813 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Nuvoton NCT6694 Socket CANfd driver based on USB interface. + * + * Copyright (C) 2024 Nuvoton Technology Corp. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define DRVNAME "nct6694_canfd" + +/* + * USB command module type for NCT6694 CANfd controller. + * This defines the module type used for communication with the NCT6694 + * CANfd controller over the USB interface. + */ +#define NCT6694_CAN_MOD 0x05 + +/* Command 00h - CAN Setting and Initialization */ +#define NCT6694_CAN_SETTING 0x00 +#define NCT6694_CAN_SETTING_CTRL1_MON BIT(0) +#define NCT6694_CAN_SETTING_CTRL1_NISO BIT(1) +#define NCT6694_CAN_SETTING_CTRL1_LBCK BIT(2) + +/* Command 01h - CAN Information */ +#define NCT6694_CAN_INFORMATION 0x01 +#define NCT6694_CAN_INFORMATION_SEL 0x00 + +/* Command 02h - CAN Event */ +#define NCT6694_CAN_EVENT 0x02 +#define NCT6694_CAN_EVENT_SEL(idx, mask) \ + ((idx ? 0x80 : 0x00) | ((mask) & 0x7F)) + +#define NCT6694_CAN_EVENT_MASK GENMASK(5, 0) +#define NCT6694_CAN_EVT_TX_FIFO_EMPTY BIT(7) /* Read-clear */ +#define NCT6694_CAN_EVT_RX_DATA_LOST BIT(5) /* Read-clear */ +#define NCT6694_CAN_EVT_RX_DATA_IN BIT(7) /* Read-clear*/ + +/* Command 10h - CAN Deliver */ +#define NCT6694_CAN_DELIVER 0x10 +#define NCT6694_CAN_DELIVER_SEL(buf_cnt) \ + ((buf_cnt) & 0xFF) + +/* Command 11h - CAN Receive */ +#define NCT6694_CAN_RECEIVE 0x11 +#define NCT6694_CAN_RECEIVE_SEL(idx, buf_cnt) \ + ((idx ? 0x80 : 0x00) | ((buf_cnt) & 0x7F)) + +#define NCT6694_CAN_FRAME_TAG_CAN0 0xC0 +#define NCT6694_CAN_FRAME_TAG_CAN1 0xC1 +#define NCT6694_CAN_FRAME_FLAG_EFF BIT(0) +#define NCT6694_CAN_FRAME_FLAG_RTR BIT(1) +#define NCT6694_CAN_FRAME_FLAG_FD BIT(2) +#define NCT6694_CAN_FRAME_FLAG_BRS BIT(3) +#define NCT6694_CAN_FRAME_FLAG_ERR BIT(4) + +#define NCT6694_NAPI_WEIGHT 32 + +enum nct6694_event_err { + NCT6694_CAN_EVT_ERR_NO_ERROR = 0, + NCT6694_CAN_EVT_ERR_CRC_ERROR, + NCT6694_CAN_EVT_ERR_STUFF_ERROR, + NCT6694_CAN_EVT_ERR_ACK_ERROR, + NCT6694_CAN_EVT_ERR_FORM_ERROR, + NCT6694_CAN_EVT_ERR_BIT_ERROR, + NCT6694_CAN_EVT_ERR_TIMEOUT_ERROR, + NCT6694_CAN_EVT_ERR_UNKNOWN_ERROR, +}; + +enum nct6694_event_status { + NCT6694_CAN_EVT_STS_ERROR_ACTIVE = 0, + NCT6694_CAN_EVT_STS_ERROR_PASSIVE, + NCT6694_CAN_EVT_STS_BUS_OFF, + NCT6694_CAN_EVT_STS_WARNING, +}; + +struct __packed nct6694_can_setting { + __le32 nbr; + __le32 dbr; + u8 active; + u8 reserved[3]; + __le16 ctrl1; + __le16 ctrl2; + __le32 nbtp; + __le32 dbtp; +}; + +struct __packed nct6694_can_information { + u8 tx_fifo_cnt; + u8 rx_fifo_cnt; + u8 reserved[2]; + __le32 can_clk; +}; + +struct __packed nct6694_can_event { + u8 err; + u8 status; + u8 tx_evt; + u8 rx_evt; + u8 rec; + u8 tec; + u8 reserved[2]; +}; + +struct __packed nct6694_can_frame { + u8 tag; + u8 flag; + u8 reserved; + u8 length; + __le32 id; + u8 data[CANFD_MAX_DLEN]; +}; + +struct nct6694_can_priv { + struct can_priv can; /* must be the first member */ + struct can_rx_offload offload; + struct can_berr_counter bec; + struct net_device *ndev; + struct nct6694 *nct6694; + struct workqueue_struct *wq; + struct work_struct tx_work; + struct nct6694_can_frame tx; + struct nct6694_can_frame rx; + struct nct6694_can_event event[2]; + unsigned char can_idx; +}; + +static inline struct nct6694_can_priv *rx_offload_to_priv(struct can_rx_offload *offload) +{ + return container_of(offload, struct nct6694_can_priv, offload); +} + +static const struct can_bittiming_const nct6694_can_bittiming_nominal_const = { + .name = DRVNAME, + .tseg1_min = 2, + .tseg1_max = 256, + .tseg2_min = 2, + .tseg2_max = 128, + .sjw_max = 128, + .brp_min = 1, + .brp_max = 511, + .brp_inc = 1, +}; + +static const struct can_bittiming_const nct6694_can_bittiming_data_const = { + .name = DRVNAME, + .tseg1_min = 1, + .tseg1_max = 32, + .tseg2_min = 1, + .tseg2_max = 16, + .sjw_max = 16, + .brp_min = 1, + .brp_max = 31, + .brp_inc = 1, +}; + +static void nct6694_can_rx_offload(struct can_rx_offload *offload, + struct sk_buff *skb) +{ + struct nct6694_can_priv *priv = rx_offload_to_priv(offload); + int ret; + + ret = can_rx_offload_queue_tail(offload, skb); + if (ret) + priv->ndev->stats.rx_fifo_errors++; +} + +static void nct6694_can_handle_lost_msg(struct net_device *ndev) +{ + struct nct6694_can_priv *priv = netdev_priv(ndev); + struct net_device_stats *stats = &ndev->stats; + struct can_frame *cf; + struct sk_buff *skb; + + netdev_err(ndev, "RX FIFO overflow, message(s) lost.\n"); + + stats->rx_errors++; + stats->rx_over_errors++; + + skb = alloc_can_err_skb(ndev, &cf); + if (!skb) + return; + + cf->can_id |= CAN_ERR_CRTL; + cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW; + + nct6694_can_rx_offload(&priv->offload, skb); +} + +static void nct6694_can_rx(struct net_device *ndev, u8 rx_evt) +{ + struct nct6694_can_priv *priv = netdev_priv(ndev); + struct nct6694_can_frame *frame = &priv->rx; + struct nct6694_cmd_header cmd_hd = { + .mod = NCT6694_CAN_MOD, + .cmd = NCT6694_CAN_RECEIVE, + .sel = NCT6694_CAN_RECEIVE_SEL(priv->can_idx, 1), + .len = cpu_to_le16(sizeof(*frame)) + }; + struct sk_buff *skb; + int ret; + + ret = nct6694_read_msg(priv->nct6694, &cmd_hd, frame); + if (ret) + return; + + if (frame->flag & NCT6694_CAN_FRAME_FLAG_FD) { + struct canfd_frame *cfd; + + skb = alloc_canfd_skb(priv->ndev, &cfd); + if (!skb) + return; + + cfd->can_id = le32_to_cpu(frame->id); + cfd->len = canfd_sanitize_len(frame->length); + if (frame->flag & NCT6694_CAN_FRAME_FLAG_EFF) + cfd->can_id |= CAN_EFF_FLAG; + if (frame->flag & NCT6694_CAN_FRAME_FLAG_BRS) + cfd->flags |= CANFD_BRS; + if (frame->flag & NCT6694_CAN_FRAME_FLAG_ERR) + cfd->flags |= CANFD_ESI; + + memcpy(cfd->data, frame->data, cfd->len); + } else { + struct can_frame *cf; + + skb = alloc_can_skb(priv->ndev, &cf); + if (!skb) + return; + + cf->can_id = le32_to_cpu(frame->id); + cf->len = canfd_sanitize_len(frame->length); + if (frame->flag & NCT6694_CAN_FRAME_FLAG_EFF) + cf->can_id |= CAN_EFF_FLAG; + + if (frame->flag & NCT6694_CAN_FRAME_FLAG_RTR) + cf->can_id |= CAN_RTR_FLAG; + else + memcpy(cf->data, frame->data, cf->len); + } + + nct6694_can_rx_offload(&priv->offload, skb); +} + +static int nct6694_can_get_berr_counter(const struct net_device *ndev, + struct can_berr_counter *bec) +{ + struct nct6694_can_priv *priv = netdev_priv(ndev); + + bec->txerr = priv->bec.txerr; + bec->rxerr = priv->bec.rxerr; + + return 0; +} + +static void nct6694_can_handle_state_change(struct net_device *ndev, + enum can_state new_state) +{ + struct nct6694_can_priv *priv = netdev_priv(ndev); + struct can_berr_counter bec; + struct can_frame *cf; + struct sk_buff *skb; + + switch (new_state) { + case CAN_STATE_ERROR_ACTIVE: + priv->can.can_stats.error_warning++; + priv->can.state = CAN_STATE_ERROR_ACTIVE; + break; + case CAN_STATE_ERROR_WARNING: + priv->can.can_stats.error_warning++; + priv->can.state = CAN_STATE_ERROR_WARNING; + break; + case CAN_STATE_ERROR_PASSIVE: + priv->can.can_stats.error_passive++; + priv->can.state = CAN_STATE_ERROR_PASSIVE; + break; + case CAN_STATE_BUS_OFF: + priv->can.state = CAN_STATE_BUS_OFF; + priv->can.can_stats.bus_off++; + can_free_echo_skb(ndev, 0, NULL); + netif_stop_queue(ndev); + can_bus_off(ndev); + break; + default: + break; + } + + skb = alloc_can_err_skb(ndev, &cf); + + nct6694_can_get_berr_counter(ndev, &bec); + + switch (new_state) { + case CAN_STATE_ERROR_WARNING: + cf->can_id |= CAN_ERR_CRTL; + if (bec.txerr > bec.rxerr) + cf->data[1] = CAN_ERR_CRTL_TX_WARNING; + else + cf->data[1] = CAN_ERR_CRTL_RX_WARNING; + cf->data[6] = bec.txerr; + cf->data[7] = bec.rxerr; + break; + case CAN_STATE_ERROR_PASSIVE: + cf->can_id |= CAN_ERR_CRTL; + cf->data[1] |= CAN_ERR_CRTL_RX_PASSIVE; + if (bec.txerr > 127) + cf->data[1] |= CAN_ERR_CRTL_TX_PASSIVE; + cf->data[6] = bec.txerr; + cf->data[7] = bec.rxerr; + break; + case CAN_STATE_BUS_OFF: + cf->can_id |= CAN_ERR_BUSOFF; + break; + default: + break; + } + + nct6694_can_rx_offload(&priv->offload, skb); +} + +static void nct6694_can_handle_state_errors(struct net_device *ndev, u8 status) +{ + struct nct6694_can_priv *priv = netdev_priv(ndev); + + if (status == NCT6694_CAN_EVT_STS_ERROR_ACTIVE && + priv->can.state != CAN_STATE_ERROR_ACTIVE) { + netdev_dbg(ndev, "Error, entered active state\n"); + nct6694_can_handle_state_change(ndev, CAN_STATE_ERROR_ACTIVE); + } + + if (status == NCT6694_CAN_EVT_STS_WARNING && + priv->can.state != CAN_STATE_ERROR_WARNING) { + netdev_dbg(ndev, "Error, entered warning state\n"); + nct6694_can_handle_state_change(ndev, CAN_STATE_ERROR_WARNING); + } + + if (status == NCT6694_CAN_EVT_STS_ERROR_PASSIVE && + priv->can.state != CAN_STATE_ERROR_PASSIVE) { + netdev_dbg(ndev, "Error, entered passive state\n"); + nct6694_can_handle_state_change(ndev, CAN_STATE_ERROR_PASSIVE); + } + + if (status == NCT6694_CAN_EVT_STS_BUS_OFF && + priv->can.state != CAN_STATE_BUS_OFF) { + netdev_dbg(ndev, "Error, entered bus-off state\n"); + nct6694_can_handle_state_change(ndev, CAN_STATE_BUS_OFF); + } +} + +static void nct6694_can_handle_bus_err(struct net_device *ndev, u8 bus_err) +{ + struct nct6694_can_priv *priv = netdev_priv(ndev); + struct can_frame *cf; + struct sk_buff *skb; + + if (bus_err == NCT6694_CAN_EVT_ERR_NO_ERROR) + return; + + priv->can.can_stats.bus_error++; + + skb = alloc_can_err_skb(ndev, &cf); + if (skb) + cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR; + + switch (bus_err) { + case NCT6694_CAN_EVT_ERR_CRC_ERROR: + netdev_dbg(ndev, "CRC error\n"); + ndev->stats.rx_errors++; + if (skb) + cf->data[3] |= CAN_ERR_PROT_LOC_CRC_SEQ; + break; + + case NCT6694_CAN_EVT_ERR_STUFF_ERROR: + netdev_dbg(ndev, "Stuff error\n"); + ndev->stats.rx_errors++; + if (skb) + cf->data[2] |= CAN_ERR_PROT_STUFF; + break; + + case NCT6694_CAN_EVT_ERR_ACK_ERROR: + netdev_dbg(ndev, "Ack error\n"); + ndev->stats.tx_errors++; + if (skb) { + cf->can_id |= CAN_ERR_ACK; + cf->data[2] |= CAN_ERR_PROT_TX; + } + break; + + case NCT6694_CAN_EVT_ERR_FORM_ERROR: + netdev_dbg(ndev, "Form error\n"); + ndev->stats.rx_errors++; + if (skb) + cf->data[2] |= CAN_ERR_PROT_FORM; + break; + + case NCT6694_CAN_EVT_ERR_BIT_ERROR: + netdev_dbg(ndev, "Bit error\n"); + ndev->stats.tx_errors++; + if (skb) + cf->data[2] |= CAN_ERR_PROT_TX | CAN_ERR_PROT_BIT; + break; + + default: + break; + } + + nct6694_can_rx_offload(&priv->offload, skb); +} + +static void nct6694_can_tx_irq(struct net_device *ndev) +{ + struct net_device_stats *stats = &ndev->stats; + + stats->tx_bytes += can_get_echo_skb(ndev, 0, NULL); + stats->tx_packets++; + netif_wake_queue(ndev); +} + +static irqreturn_t nct6694_can_irq(int irq, void *data) +{ + struct net_device *ndev = data; + struct nct6694_can_priv *priv = netdev_priv(ndev); + struct nct6694_can_event *evt = priv->event; + struct nct6694_cmd_header cmd_hd = { + .mod = NCT6694_CAN_MOD, + .cmd = NCT6694_CAN_EVENT, + .sel = NCT6694_CAN_EVENT_SEL(priv->can_idx, NCT6694_CAN_EVENT_MASK), + .len = cpu_to_le16(sizeof(priv->event)) + }; + irqreturn_t handled = IRQ_NONE; + int can_idx = priv->can_idx; + int ret; + + ret = nct6694_read_msg(priv->nct6694, &cmd_hd, evt); + if (ret < 0) + return handled; + + if (priv->event[can_idx].rx_evt & NCT6694_CAN_EVT_RX_DATA_IN) { + nct6694_can_rx(ndev, priv->event[can_idx].rx_evt); + handled = IRQ_HANDLED; + } + + if (priv->event[can_idx].rx_evt & NCT6694_CAN_EVT_RX_DATA_LOST) { + nct6694_can_handle_lost_msg(ndev); + handled = IRQ_HANDLED; + } + + if (priv->event[can_idx].status) { + nct6694_can_handle_state_errors(ndev, priv->event[can_idx].status); + handled = IRQ_HANDLED; + } + + if (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING) { + nct6694_can_handle_bus_err(ndev, priv->event[can_idx].err); + handled = IRQ_HANDLED; + } + + if (handled) + can_rx_offload_threaded_irq_finish(&priv->offload); + + if (priv->event[can_idx].tx_evt & NCT6694_CAN_EVT_TX_FIFO_EMPTY) + nct6694_can_tx_irq(ndev); + + priv->bec.rxerr = priv->event[can_idx].rec; + priv->bec.txerr = priv->event[can_idx].tec; + + return handled; +} + +static void nct6694_can_tx_work(struct work_struct *work) +{ + struct nct6694_can_priv *priv = container_of(work, + struct nct6694_can_priv, + tx_work); + struct nct6694_can_frame *frame = &priv->tx; + struct nct6694_cmd_header cmd_hd = { + .mod = NCT6694_CAN_MOD, + .cmd = NCT6694_CAN_DELIVER, + .sel = NCT6694_CAN_DELIVER_SEL(1), + .len = cpu_to_le16(sizeof(*frame)) + }; + struct net_device *ndev = priv->ndev; + struct net_device_stats *stats = &ndev->stats; + struct sk_buff *skb = priv->can.echo_skb[0]; + u32 txid; + int err; + + memset(frame, 0, sizeof(*frame)); + + if (priv->can_idx == 0) + frame->tag = NCT6694_CAN_FRAME_TAG_CAN0; + else + frame->tag = NCT6694_CAN_FRAME_TAG_CAN1; + + if (can_is_canfd_skb(skb)) { + struct canfd_frame *cfd = (struct canfd_frame *)skb->data; + + if (cfd->flags & CANFD_BRS) + frame->flag |= NCT6694_CAN_FRAME_FLAG_BRS; + + if (cfd->can_id & CAN_EFF_FLAG) { + txid = cfd->can_id & CAN_EFF_MASK; + frame->flag |= NCT6694_CAN_FRAME_FLAG_EFF; + } else { + txid = cfd->can_id & CAN_SFF_MASK; + } + frame->flag |= NCT6694_CAN_FRAME_FLAG_FD; + frame->id = cpu_to_le32(txid); + frame->length = cfd->len; + + memcpy(frame->data, cfd->data, cfd->len); + } else { + struct can_frame *cf = (struct can_frame *)skb->data; + + if (cf->can_id & CAN_EFF_FLAG) { + txid = cf->can_id & CAN_EFF_MASK; + frame->flag |= NCT6694_CAN_FRAME_FLAG_EFF; + } else { + txid = cf->can_id & CAN_SFF_MASK; + } + + if (cf->can_id & CAN_RTR_FLAG) + frame->flag |= NCT6694_CAN_FRAME_FLAG_RTR; + else + memcpy(frame->data, cf->data, cf->len); + + frame->id = cpu_to_le32(txid); + frame->length = cf->len; + } + + err = nct6694_write_msg(priv->nct6694, &cmd_hd, frame); + if (err) { + netdev_err(ndev, "%s: TX FIFO is full!\n", __func__); + can_free_echo_skb(ndev, 0, NULL); + stats->tx_dropped++; + stats->tx_errors++; + netif_wake_queue(ndev); + } +} + +static netdev_tx_t nct6694_can_start_xmit(struct sk_buff *skb, + struct net_device *ndev) +{ + struct nct6694_can_priv *priv = netdev_priv(ndev); + + if (can_dev_dropped_skb(ndev, skb)) + return NETDEV_TX_OK; + + netif_stop_queue(ndev); + can_put_echo_skb(skb, ndev, 0, 0); + queue_work(priv->wq, &priv->tx_work); + + return NETDEV_TX_OK; +} + +static int nct6694_can_start(struct net_device *ndev) +{ + struct nct6694_can_priv *priv = netdev_priv(ndev); + struct nct6694_can_setting *setting; + struct nct6694_cmd_header cmd_hd = { + .mod = NCT6694_CAN_MOD, + .cmd = NCT6694_CAN_SETTING, + .sel = priv->can_idx, + .len = cpu_to_le16(sizeof(*setting)) + }; + const struct can_bittiming *n_bt = &priv->can.bittiming; + const struct can_bittiming *d_bt = &priv->can.data_bittiming; + int ret; + + setting = kzalloc(sizeof(*setting), GFP_KERNEL); + if (!setting) + return -ENOMEM; + + setting->nbr = cpu_to_le32(n_bt->bitrate); + setting->dbr = cpu_to_le32(d_bt->bitrate); + + if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY) + setting->ctrl1 |= cpu_to_le16(NCT6694_CAN_SETTING_CTRL1_MON); + + if ((priv->can.ctrlmode & CAN_CTRLMODE_FD) && + priv->can.ctrlmode & CAN_CTRLMODE_FD_NON_ISO) + setting->ctrl1 |= cpu_to_le16(NCT6694_CAN_SETTING_CTRL1_NISO); + + if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK) + setting->ctrl1 |= cpu_to_le16(NCT6694_CAN_SETTING_CTRL1_LBCK); + + ret = nct6694_write_msg(priv->nct6694, &cmd_hd, setting); + if (ret) + goto exit; + + priv->can.state = CAN_STATE_ERROR_ACTIVE; + +exit: + kfree(setting); + return ret; +} + +static int nct6694_can_stop(struct net_device *ndev) +{ + struct nct6694_can_priv *priv = netdev_priv(ndev); + + netif_stop_queue(ndev); + free_irq(ndev->irq, ndev); + destroy_workqueue(priv->wq); + priv->wq = NULL; + priv->can.state = CAN_STATE_STOPPED; + can_rx_offload_disable(&priv->offload); + close_candev(ndev); + + return 0; +} + +static int nct6694_can_set_mode(struct net_device *ndev, enum can_mode mode) +{ + switch (mode) { + case CAN_MODE_START: + nct6694_can_start(ndev); + netif_wake_queue(ndev); + return 0; + default: + return -EOPNOTSUPP; + } +} + +static int nct6694_can_open(struct net_device *ndev) +{ + struct nct6694_can_priv *priv = netdev_priv(ndev); + int ret; + + ret = open_candev(ndev); + if (ret) + return ret; + + can_rx_offload_enable(&priv->offload); + + ret = request_threaded_irq(ndev->irq, NULL, + nct6694_can_irq, IRQF_ONESHOT, + "nct6694_can", ndev); + if (ret) { + netdev_err(ndev, "Failed to request IRQ\n"); + goto close_candev; + } + + priv->wq = alloc_ordered_workqueue("%s-nct6694_wq", + WQ_FREEZABLE | WQ_MEM_RECLAIM, + ndev->name); + if (!priv->wq) { + ret = -ENOMEM; + goto free_irq; + } + + ret = nct6694_can_start(ndev); + if (ret) + goto destroy_wq; + + netif_start_queue(ndev); + + return 0; + +destroy_wq: + destroy_workqueue(priv->wq); +free_irq: + free_irq(ndev->irq, ndev); +close_candev: + can_rx_offload_disable(&priv->offload); + close_candev(ndev); + return ret; +} + +static const struct net_device_ops nct6694_can_netdev_ops = { + .ndo_open = nct6694_can_open, + .ndo_stop = nct6694_can_stop, + .ndo_start_xmit = nct6694_can_start_xmit, + .ndo_change_mtu = can_change_mtu, +}; + +static const struct ethtool_ops nct6694_can_ethtool_ops = { + .get_ts_info = ethtool_op_get_ts_info, +}; + +static int nct6694_can_get_clock(struct nct6694_can_priv *priv) +{ + struct nct6694_can_information *info; + struct nct6694_cmd_header cmd_hd = { + .mod = NCT6694_CAN_MOD, + .cmd = NCT6694_CAN_INFORMATION, + .sel = NCT6694_CAN_INFORMATION_SEL, + .len = cpu_to_le16(sizeof(*info)) + }; + int ret, can_clk; + + info = kzalloc(sizeof(*info), GFP_KERNEL); + if (!info) + return -ENOMEM; + + ret = nct6694_read_msg(priv->nct6694, &cmd_hd, info); + if (ret) + goto exit; + + can_clk = le32_to_cpu(info->can_clk); + +exit: + kfree(info); + return can_clk; +} + +static int nct6694_can_probe(struct platform_device *pdev) +{ + const struct mfd_cell *cell = mfd_get_cell(pdev); + struct nct6694 *nct6694 = dev_get_drvdata(pdev->dev.parent); + struct nct6694_can_priv *priv; + struct net_device *ndev; + int ret, irq, can_clk; + + irq = irq_create_mapping(nct6694->domain, + NCT6694_IRQ_CAN1 + cell->id); + if (!irq) + return irq; + + ndev = alloc_candev(sizeof(struct nct6694_can_priv), 1); + if (!ndev) + return -ENOMEM; + + ndev->irq = irq; + ndev->flags |= IFF_ECHO; + ndev->dev_port = cell->id; + ndev->netdev_ops = &nct6694_can_netdev_ops; + ndev->ethtool_ops = &nct6694_can_ethtool_ops; + + priv = netdev_priv(ndev); + priv->nct6694 = nct6694; + priv->ndev = ndev; + + can_clk = nct6694_can_get_clock(priv); + if (can_clk < 0) { + ret = dev_err_probe(&pdev->dev, can_clk, + "Failed to get clock\n"); + goto free_candev; + } + + INIT_WORK(&priv->tx_work, nct6694_can_tx_work); + + priv->can_idx = cell->id; + priv->can.state = CAN_STATE_STOPPED; + priv->can.clock.freq = can_clk; + priv->can.bittiming_const = &nct6694_can_bittiming_nominal_const; + priv->can.data_bittiming_const = &nct6694_can_bittiming_data_const; + priv->can.do_set_mode = nct6694_can_set_mode; + priv->can.do_get_berr_counter = nct6694_can_get_berr_counter; + + priv->can.ctrlmode = CAN_CTRLMODE_FD; + + priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK | + CAN_CTRLMODE_LISTENONLY | + CAN_CTRLMODE_FD | + CAN_CTRLMODE_FD_NON_ISO | + CAN_CTRLMODE_BERR_REPORTING; + + ret = can_rx_offload_add_manual(ndev, &priv->offload, + NCT6694_NAPI_WEIGHT); + if (ret) { + dev_err_probe(&pdev->dev, ret, "Failed to add rx_offload\n"); + goto free_candev; + } + + platform_set_drvdata(pdev, priv); + SET_NETDEV_DEV(priv->ndev, &pdev->dev); + + ret = register_candev(priv->ndev); + if (ret) + goto del_rx_offload; + + return 0; + +del_rx_offload: + can_rx_offload_del(&priv->offload); +free_candev: + free_candev(ndev); + return ret; +} + +static void nct6694_can_remove(struct platform_device *pdev) +{ + struct nct6694_can_priv *priv = platform_get_drvdata(pdev); + + cancel_work_sync(&priv->tx_work); + unregister_candev(priv->ndev); + can_rx_offload_del(&priv->offload); + free_candev(priv->ndev); +} + +static struct platform_driver nct6694_can_driver = { + .driver = { + .name = DRVNAME, + }, + .probe = nct6694_can_probe, + .remove = nct6694_can_remove, +}; + +module_platform_driver(nct6694_can_driver); + +MODULE_DESCRIPTION("USB-CAN FD driver for NCT6694"); +MODULE_AUTHOR("Ming Yu "); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:nct6694-can");