From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail.loongson.cn (mail.loongson.cn [114.242.206.163]) by smtp.subspace.kernel.org (Postfix) with ESMTP id AE6D72F28FC for ; Tue, 30 Jun 2026 03:01:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=114.242.206.163 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782788520; cv=none; b=g9d8JRQ35Kwnv23OOIWoSb06BlHNBWZSV/8X6vt6bdbqTEFDjqU7g3wKt9YXJ8GRxMArjEVjh+CEaGmnqNVEqdVjNMLtPET6r4dREnEo1qTtuQh8LDhRdYJ93CRijod6PR1PBjMkZsvjTGt3yvNgV3mWFq20ySaIAWIRJ+Ypjlc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782788520; c=relaxed/simple; bh=LNhW0c1bJhR6LZlA6GfUP3CL5jcQ92LEgGB4Bcz9a4I=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=dfonLSr5xgWWj2YRrOM73NlrlWQJyJxq/6MxOm22ybsyHipxAKVyhvtrNWIYGyNo4lASlswgjqlT15mPwfotWUCCHCGoJ7y9bMQ/Zuk2Rexxts8yqYNJR2ipeurtTC1Mx+0yBDFTYolBr/E16xBNS8raX/E2Kk6Cl5cyyM0GX6I= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=loongson.cn; spf=pass smtp.mailfrom=loongson.cn; arc=none smtp.client-ip=114.242.206.163 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=loongson.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=loongson.cn Received: from loongson.cn (unknown [223.64.68.155]) by gateway (Coremail) with SMTP id _____8Cx9OijMUNqCHsZAA--.58977S3; Tue, 30 Jun 2026 11:01:55 +0800 (CST) Received: from kernelserver (unknown [223.64.68.155]) by front1 (Coremail) with SMTP id qMiowJBx68GcMUNqG4e4AA--.19681S2; Tue, 30 Jun 2026 11:01:50 +0800 (CST) From: Binbin Zhou To: Binbin Zhou , Huacai Chen , Marc Kleine-Budde , Vincent Mailhol , Bingxiong Li Cc: Huacai Chen , Xuerui Wang , loongarch@lists.linux.dev, linux-can@vger.kernel.org, jeffbai@aosc.io, Binbin Zhou Subject: [PATCH v3 0/2] Add Loongson CAN-FD controller driver Date: Tue, 30 Jun 2026 11:01:39 +0800 Message-ID: X-Mailer: git-send-email 2.52.0 Precedence: bulk X-Mailing-List: linux-can@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CM-TRANSID:qMiowJBx68GcMUNqG4e4AA--.19681S2 X-CM-SenderInfo: p2kr3uplqex0o6or00hjvr0hdfq/1tbiAgENCGpCCTEOsAACsq X-Coremail-Antispam: 1Uk129KBj93XoWxCryDuFWkGr47KF18trW5urX_yoW5Xr1kpF 4Yk3sxur1DKr4xAFs3JayrCF15A3Z3Jr43Wa9xtw10kas8Z342gw1Sk3W5Zry29rW5CFWj q3y8uFyfuFn8AFgCm3ZEXasCq-sJn29KB7ZKAUJUUUUr529EdanIXcx71UUUUU7KY7ZEXa sCq-sGcSsGvfJ3Ic02F40EFcxC0VAKzVAqx4xG6I80ebIjqfuFe4nvWSU5nxnvy29KBjDU 0xBIdaVrnRJUUU90b4IE77IF4wAFF20E14v26r1j6r4UM7CY07I20VC2zVCF04k26cxKx2 IYs7xG6rWj6s0DM7CIcVAFz4kK6r1Y6r17M28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48v e4kI8wA2z4x0Y4vE2Ix0cI8IcVAFwI0_JFI_Gr1l84ACjcxK6xIIjxv20xvEc7CjxVAFwI 0_Gr0_Cr1l84ACjcxK6I8E87Iv67AKxVWxJVW8Jr1l84ACjcxK6I8E87Iv6xkF7I0E14v2 6r4UJVWxJr1ln4kS14v26r1Y6r17M2AIxVAIcxkEcVAq07x20xvEncxIr21l57IF6xkI12 xvs2x26I8E6xACxx1l5I8CrVACY4xI64kE6c02F40Ex7xfMcIj6xIIjxv20xvE14v26r1Y 6r17McIj6I8E87Iv67AKxVWUJVW8JwAm72CE4IkC6x0Yz7v_Jr0_Gr1lF7xvr2IYc2Ij64 vIr41l42xK82IYc2Ij64vIr41l4I8I3I0E4IkC6x0Yz7v_Jr0_Gr1l4IxYO2xFxVAFwI0_ Jrv_JF1lx2IqxVAqx4xG67AKxVWUJVWUGwC20s026x8GjcxK67AKxVWUGVWUWwC2zVAF1V AY17CE14v26r1q6r43MIIYrxkI7VAKI48JMIIF0xvE2Ix0cI8IcVAFwI0_Jr0_JF4lIxAI cVC0I7IYx2IY6xkF7I0E14v26r1j6r4UMIIF0xvE42xK8VAvwI8IcIk0rVWUJVWUCwCI42 IY6I8E87Iv67AKxVWUJVW8JwCI42IY6I8E87Iv6xkF7I0E14v26r1j6r4UYxBIdaVFxhVj vjDU0xZFpf9x07jepB-UUUUU= Hi all: This patchset adds support for the CAN-FD controller found on Loongson CPUs. Patch 1 introduces the basic CAN-FD controller driver with support for classic CAN and CAN FD, including bit timing, error handling, NAPI-based RX, and multiple TX buffers. Patch 2 adds optional DMA support for RX path using the Loongson APB CMC DMA engine, which significantly reduces CPU load under high receive throughput. The driver has been tested on Loongson-2K3000 platforms with various CAN/CAN FD traffic patterns. Finally, I'd like to thank Bingxiong, the original author of this driver, for his efforts in working on the patch. Thanks. Binbin ========= V3: Patch (1/2): - Replace the switch-case statement with a calculated mask in `loongson_canfd_get_txbuf_sts()`; - Change `loongson_canfd_reset()` return type to `void`; - Drop old code in `loongson_canfd_set_btr()`; - Rename `loongson_canfd_set_mode()` to `loongson_canfd_set_conf_mode()`; - Drop `cf->__res*` usage; - Drop unnecessary macro definitions; - Add `netif_napi_del()` in probe error route path; - Replace ternary operator with `if-else`; - Drop stats->rx_packets and stats->rx_bytes count in CAN error frames; - Add ethtool_ops; - Add CAN_CTRLMODE_CC_LEN8_DLC; Patch (2/2): - Fix W=2 warning; - Rename get_rx_frc() -> get_rxbuf_empty(); - Put `loongson_canfd_rxdma_remove()` before free_candev(); - Adjust the RXDMA probe process. Link to V2: https://lore.kernel.org/all/cover.1780908445.git.zhoubinbin@loongson.cn/ V2: Patch (1/2): - Put all code into one file; - Add COMPILE_TEST Kconfig option; - Rewrite Kconfig description; - Use `regmap_test_bits()` to simplify bit field checks; - Drop odd FIELD_GET() usage; - Don't use FIELD_GET() for a single bit; - Use an if/else instead of the ternary operator; - Use the CAN TDC framework to get the SSP value; - Use guard(spinlock)/scoped_guard(spinlock); - Use netdev_debug() to be less verboss; - Check for memory allocation failure; - Add CAN_ERR_CNT flag; - Drop unused REG_DATA_xx_yy_W_DATA_yy definition; - Add more function comment; Link to V1: https://lore.kernel.org/all/cover.1777273055.git.zhoubinbin@loongson.cn/ Binbin Zhou (2): can: Add Loongson CAN-FD controller driver can: loongson_canfd: Add RXDMA support MAINTAINERS | 7 + drivers/net/can/Kconfig | 11 + drivers/net/can/Makefile | 1 + drivers/net/can/loongson_canfd.c | 1859 ++++++++++++++++++++++++++++++ 4 files changed, 1878 insertions(+) create mode 100644 drivers/net/can/loongson_canfd.c base-commit: b266bacba796ff5c4dcd2ae2fc08aacf7ab39153 -- 2.52.0