From nobody Thu Oct 9 06:55:51 2025 Received: from mail.loongson.cn (mail.loongson.cn [114.242.206.163]) by smtp.subspace.kernel.org (Postfix) with ESMTP id D947F1B960 for ; Fri, 20 Jun 2025 02:06:51 +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=1750385214; cv=none; b=UjkuhQtu5nzA5bE/mxYdxfgfXM6Ygph5oesOtvFJLDCv71c8JceqlcVykrVwCmgHU0t3NtzRSPFIDUBwfwuzFgc53WWRr6ssERZMek0U09x7wbjeOO8AI5oqu1eGyPmEA4KCGPxy0Kh0MFFrLutCp1ohdU6v7gXNBevcdJkXsuw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750385214; c=relaxed/simple; bh=0IMNRrBwsUtPjrMBrN75aN4WtfKl9O+CUh4fg1LY/kU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=AneKePH6aN6W3vxcqVKmi2CHgqH4PE4oBIBWNNvPfw8DiUYgOm0ZehkRp6Tw8MgrI2erg61Wzy7VDoooRbnYFLtpLU+GTzwXzSgltXmUVNahzNWNZy4yk+yd8tPF6mqb+MaQBDxcMWbRNGkRwNryNDmp7QWDgqTtk6Ty/1tV5f0= 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 [223.64.68.149]) by gateway (Coremail) with SMTP id _____8AxDGs5wlRoWSMaAQ--.59480S3; Fri, 20 Jun 2025 10:06:49 +0800 (CST) Received: from localhost.localdomain (unknown [223.64.68.149]) by front1 (Coremail) with SMTP id qMiowMCx7MQuwlRodNIhAQ--.36930S3; Fri, 20 Jun 2025 10:06:46 +0800 (CST) From: Binbin Zhou To: Binbin Zhou , Huacai Chen , Lee Jones , Corey Minyard Cc: Huacai Chen , Xuerui Wang , loongarch@lists.linux.dev, linux-kernel@vger.kernel.org, openipmi-developer@lists.sourceforge.net, jeffbai@aosc.io, kexybiscuit@aosc.io, wangyao@lemote.com, Binbin Zhou , Chong Qiao Subject: [PATCH v5 1/3] mfd: ls2kbmc: Introduce Loongson-2K BMC core driver Date: Fri, 20 Jun 2025 10:06:27 +0800 Message-ID: <82cbc8558f15981e0953ab229d2afcc5501f982c.1750301674.git.zhoubinbin@loongson.cn> X-Mailer: git-send-email 2.47.1 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: qMiowMCx7MQuwlRodNIhAQ--.36930S3 X-CM-SenderInfo: p2kr3uplqex0o6or00hjvr0hdfq/ X-Coremail-Antispam: 1Uk129KBj93XoW3Jw48JFyfXr47Jr1kGrWxGrX_yoW3GrWrp3 W8Aay5Crn5AF17Wa9xAr1UuFW3ua9av3y5JFW3Ww1a9an3Ca4DXw4ktFyYvF9rJFykKFy2 qF9xXr4xCan8JFcCm3ZEXasCq-sJn29KB7ZKAUJUUUU3529EdanIXcx71UUUUU7KY7ZEXa sCq-sGcSsGvfJ3Ic02F40EFcxC0VAKzVAqx4xG6I80ebIjqfuFe4nvWSU5nxnvy29KBjDU 0xBIdaVrnRJUUUBFb4IE77IF4wAFF20E14v26r1j6r4UM7CY07I20VC2zVCF04k26cxKx2 IYs7xG6rWj6s0DM7CIcVAFz4kK6r1q6r4UM28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48v e4kI8wA2z4x0Y4vE2Ix0cI8IcVAFwI0_Xr0_Ar1l84ACjcxK6xIIjxv20xvEc7CjxVAFwI 0_Gr0_Cr1l84ACjcxK6I8E87Iv67AKxVWxJr0_GcWl84ACjcxK6I8E87Iv6xkF7I0E14v2 6F4UJVW0owAaw2AFwI0_JF0_Jw1le2I262IYc4CY6c8Ij28IcVAaY2xG8wAqjxCEc2xF0c Ia020Ex4CE44I27wAqx4xG64xvF2IEw4CE5I8CrVC2j2WlYx0E2Ix0cI8IcVAFwI0_Jw0_ WrylYx0Ex4A2jsIE14v26r4j6F4UMcvjeVCFs4IE7xkEbVWUJVW8JwACjcxG0xvY0x0EwI xGrwCY1x0262kKe7AKxVWUAVWUtwCF04k20xvY0x0EwIxGrwCFx2IqxVCFs4IE7xkEbVWU JVW8JwCFI7km07C267AKxVWUAVWUtwC20s026c02F40E14v26r1j6r18MI8I3I0E7480Y4 vE14v26r106r1rMI8E67AF67kF1VAFwI0_Jw0_GFylIxkGc2Ij64vIr41lIxAIcVC0I7IY x2IY67AKxVW8JVW5JwCI42IY6xIIjxv20xvEc7CjxVAFwI0_Gr0_Cr1lIxAIcVCF04k26c xKx2IYs7xG6r1j6r1xMIIF0xvEx4A2jsIE14v26r4j6F4UMIIF0xvEx4A2jsIEc7CjxVAF wI0_Gr0_Gr1UYxBIdaVFxhVjvjDU0xZFpf9x07UAKsUUUUUU= Content-Type: text/plain; charset="utf-8" The Loongson-2K Board Management Controller provides an PCIe interface to the host to access the feature implemented in the BMC. The BMC is assembled on a server similar to the server machine with Loongson-3 CPU. It supports multiple sub-devices like DRM and IPMI. Reviewed-by: Huacai Chen Co-developed-by: Chong Qiao Signed-off-by: Chong Qiao Signed-off-by: Binbin Zhou --- drivers/mfd/Kconfig | 11 +++ drivers/mfd/Makefile | 2 + drivers/mfd/ls2k-bmc-core.c | 156 ++++++++++++++++++++++++++++++++++++ 3 files changed, 169 insertions(+) create mode 100644 drivers/mfd/ls2k-bmc-core.c diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index 96992af22565..a1081c4211b0 100644 --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig @@ -2389,6 +2389,18 @@ config MFD_INTEL_M10_BMC_PMCI additional drivers must be enabled in order to use the functionality of the device. =20 +config MFD_LS2K_BMC_CORE + bool "Loongson-2K Board Management Controller Support" + select MFD_CORE + help + Say yes here to add support for the Loongson-2K BMC which is a Board + Management Controller connected to the PCIe bus. The device supports + multiple sub-devices like display and IPMI. This driver provides common + support for accessing the devices. + + The display is enabled by default in the driver, while the IPMI interfa= ce + is enabled independently through the IPMI_LS2K option in the IPMI secti= on. + config MFD_QNAP_MCU tristate "QNAP microcontroller unit core driver" depends on SERIAL_DEV_BUS diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile index 5e5cc279af60..6bad54edca34 100644 --- a/drivers/mfd/Makefile +++ b/drivers/mfd/Makefile @@ -282,6 +282,8 @@ obj-$(CONFIG_MFD_INTEL_M10_BMC_CORE) +=3D intel-m10-b= mc-core.o obj-$(CONFIG_MFD_INTEL_M10_BMC_SPI) +=3D intel-m10-bmc-spi.o obj-$(CONFIG_MFD_INTEL_M10_BMC_PMCI) +=3D intel-m10-bmc-pmci.o =20 +obj-$(CONFIG_MFD_LS2K_BMC_CORE) +=3D ls2k-bmc-core.o + obj-$(CONFIG_MFD_ATC260X) +=3D atc260x-core.o obj-$(CONFIG_MFD_ATC260X_I2C) +=3D atc260x-i2c.o =20 diff --git a/drivers/mfd/ls2k-bmc-core.c b/drivers/mfd/ls2k-bmc-core.c new file mode 100644 index 000000000000..9ee1edf286e7 --- /dev/null +++ b/drivers/mfd/ls2k-bmc-core.c @@ -0,0 +1,156 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Loongson-2K Board Management Controller (BMC) Core Driver. + * + * Copyright (C) 2024-2025 Loongson Technology Corporation Limited. + * + * Authors: + * Chong Qiao + * Binbin Zhou + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* LS2K BMC resources */ +#define LS2K_DISPLAY_RES_START (SZ_16M + SZ_2M) +#define LS2K_IPMI_RES_SIZE 0x1C +#define LS2K_IPMI0_RES_START (SZ_16M + 0xF00000) +#define LS2K_IPMI1_RES_START (LS2K_IPMI0_RES_START + LS2K_IPMI_RES_SIZE) +#define LS2K_IPMI2_RES_START (LS2K_IPMI1_RES_START + LS2K_IPMI_RES_SIZE) +#define LS2K_IPMI3_RES_START (LS2K_IPMI2_RES_START + LS2K_IPMI_RES_SIZE) +#define LS2K_IPMI4_RES_START (LS2K_IPMI3_RES_START + LS2K_IPMI_RES_SIZE) + +static struct resource ls2k_display_resources[] =3D { + DEFINE_RES_MEM_NAMED(LS2K_DISPLAY_RES_START, SZ_4M, "simpledrm-res"), +}; + +static struct resource ls2k_ipmi0_resources[] =3D { + DEFINE_RES_MEM_NAMED(LS2K_IPMI0_RES_START, LS2K_IPMI_RES_SIZE, "ipmi0-res= "), +}; + +static struct resource ls2k_ipmi1_resources[] =3D { + DEFINE_RES_MEM_NAMED(LS2K_IPMI1_RES_START, LS2K_IPMI_RES_SIZE, "ipmi1-res= "), +}; + +static struct resource ls2k_ipmi2_resources[] =3D { + DEFINE_RES_MEM_NAMED(LS2K_IPMI2_RES_START, LS2K_IPMI_RES_SIZE, "ipmi2-res= "), +}; + +static struct resource ls2k_ipmi3_resources[] =3D { + DEFINE_RES_MEM_NAMED(LS2K_IPMI3_RES_START, LS2K_IPMI_RES_SIZE, "ipmi3-res= "), +}; + +static struct resource ls2k_ipmi4_resources[] =3D { + DEFINE_RES_MEM_NAMED(LS2K_IPMI4_RES_START, LS2K_IPMI_RES_SIZE, "ipmi4-res= "), +}; + +static struct mfd_cell ls2k_bmc_cells[] =3D { + MFD_CELL_RES("simple-framebuffer", ls2k_display_resources), + MFD_CELL_RES("ls2k-ipmi-si", ls2k_ipmi0_resources), + MFD_CELL_RES("ls2k-ipmi-si", ls2k_ipmi1_resources), + MFD_CELL_RES("ls2k-ipmi-si", ls2k_ipmi2_resources), + MFD_CELL_RES("ls2k-ipmi-si", ls2k_ipmi3_resources), + MFD_CELL_RES("ls2k-ipmi-si", ls2k_ipmi4_resources), +}; + +/* + * Currently the Loongson-2K BMC hardware does not have an I2C interface t= o adapt to the + * resolution. We set the resolution by presetting "video=3D1280x1024-16@2= M" to the BMC memory. + */ +static int ls2k_bmc_parse_mode(struct pci_dev *pdev, struct simplefb_platf= orm_data *pd) +{ + char *mode; + int depth, ret; + + /* The last 16M of PCI BAR0 is used to store the resolution string. */ + mode =3D devm_ioremap(&pdev->dev, pci_resource_start(pdev, 0) + SZ_16M, S= Z_16M); + if (!mode) + return -ENOMEM; + + /* The resolution field starts with the flag "video=3D". */ + if (!strncmp(mode, "video=3D", 6)) + mode =3D mode + 6; + + ret =3D kstrtoint(strsep(&mode, "x"), 10, &pd->width); + if (ret) + return ret; + + ret =3D kstrtoint(strsep(&mode, "-"), 10, &pd->height); + if (ret) + return ret; + + ret =3D kstrtoint(strsep(&mode, "@"), 10, &depth); + if (ret) + return ret; + + pd->stride =3D pd->width * depth / 8; + pd->format =3D depth =3D=3D 32 ? "a8r8g8b8" : "r5g6b5"; + + return 0; +} + +static int ls2k_bmc_probe(struct pci_dev *dev, const struct pci_device_id = *id) +{ + struct simplefb_platform_data pd; + resource_size_t base; + int ret; + + ret =3D pci_enable_device(dev); + if (ret) + return ret; + + ret =3D ls2k_bmc_parse_mode(dev, &pd); + if (ret) + goto disable_pci; + + ls2k_bmc_cells[0].platform_data =3D &pd; + ls2k_bmc_cells[0].pdata_size =3D sizeof(pd); + base =3D dev->resource[0].start + LS2K_DISPLAY_RES_START; + + /* Remove conflicting efifb device */ + ret =3D aperture_remove_conflicting_devices(base, SZ_4M, "simple-framebuf= fer"); + if (ret) { + dev_err(&dev->dev, "Failed to removed firmware framebuffers: %d\n", ret); + goto disable_pci; + } + + return devm_mfd_add_devices(&dev->dev, PLATFORM_DEVID_AUTO, + ls2k_bmc_cells, ARRAY_SIZE(ls2k_bmc_cells), + &dev->resource[0], 0, NULL); + +disable_pci: + pci_disable_device(dev); + return ret; +} + +static void ls2k_bmc_remove(struct pci_dev *dev) +{ + pci_disable_device(dev); +} + +static struct pci_device_id ls2k_bmc_devices[] =3D { + { PCI_DEVICE(PCI_VENDOR_ID_LOONGSON, 0x1a05) }, + { } +}; +MODULE_DEVICE_TABLE(pci, ls2k_bmc_devices); + +static struct pci_driver ls2k_bmc_driver =3D { + .name =3D "ls2k-bmc", + .id_table =3D ls2k_bmc_devices, + .probe =3D ls2k_bmc_probe, + .remove =3D ls2k_bmc_remove, +}; +module_pci_driver(ls2k_bmc_driver); + +MODULE_DESCRIPTION("Loongson-2K BMC Core driver"); +MODULE_AUTHOR("Loongson Technology Corporation Limited"); +MODULE_LICENSE("GPL"); --=20 2.47.1