From nobody Fri Dec 19 20:38:03 2025 Received: from mail.loongson.cn (mail.loongson.cn [114.242.206.163]) by smtp.subspace.kernel.org (Postfix) with ESMTP id CFA8D189916 for ; Thu, 15 May 2025 02:32:41 +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=1747276365; cv=none; b=tQ3ADoGX8XF8tWl0dO9dUPGpQvxRqWNqENrb+y2CPGUg5l6/URDGk42h6ztia1MG0Lbj53V4bMz9LuaKPVPsNugQwEvfwR7yc+y+0PxLzXx/2eyuHY+9emct9Cex1WgdaqzswwUCy7WV8KeSj9gcidsG0n9qP4aLKZM91aCkc6w= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747276365; c=relaxed/simple; bh=84v9gibVD3U7yDeP5uBGKM8oyZVBjPUiJjlCHZfE55M=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=eFnVwzdgn+JDHjQZG8FLafO46i21jdsx78TIrzGuNPtHXajNfNZmdpOkng0p/OfBNDLCqFDjK/Fzl4sV5z92kCvgMJ7TwUpmz0No4epIwzEHsRzKbB/1CuPgEuFD6o4QSB6iZNEpcwflSo/QoF+NJtjW+geeUz58Oi4XdFZ6ea8= 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 [223.64.68.186]) by gateway (Coremail) with SMTP id _____8AxaeFHUiVoTonoAA--.6818S3; Thu, 15 May 2025 10:32:39 +0800 (CST) Received: from localhost.localdomain (unknown [223.64.68.186]) by front1 (Coremail) with SMTP id qMiowMCxbsVDUiVo1PnTAA--.19913S3; Thu, 15 May 2025 10:32:38 +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, Binbin Zhou , Chong Qiao Subject: [PATCH v2 1/3] mfd: ls2kbmc: Introduce Loongson-2K BMC MFD Core driver Date: Thu, 15 May 2025 10:32:24 +0800 Message-ID: <778675bfe1040cd1bf4d281dc5c5f20edc4145c1.1747276047.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: qMiowMCxbsVDUiVo1PnTAA--.19913S3 X-CM-SenderInfo: p2kr3uplqex0o6or00hjvr0hdfq/ X-Coremail-Antispam: 1Uk129KBj93XoW3JryfWFW5ur4kKw15Kw1fXwc_yoWxtFy3p3 WxAay5GF4DJF17Wa93ur1UCFW3ua9aq3y5tay3JwnIya97Aa4kXw1ktFyavF9rJFyvgry2 qF98Xr4UCan8JFcCm3ZEXasCq-sJn29KB7ZKAUJUUUU7529EdanIXcx71UUUUU7KY7ZEXa sCq-sGcSsGvfJ3Ic02F40EFcxC0VAKzVAqx4xG6I80ebIjqfuFe4nvWSU5nxnvy29KBjDU 0xBIdaVrnRJUUUB0b4IE77IF4wAFF20E14v26r1j6r4UM7CY07I20VC2zVCF04k26cxKx2 IYs7xG6rWj6s0DM7CIcVAFz4kK6r126r13M28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48v e4kI8wA2z4x0Y4vE2Ix0cI8IcVAFwI0_Xr0_Ar1l84ACjcxK6xIIjxv20xvEc7CjxVAFwI 0_Gr0_Cr1l84ACjcxK6I8E87Iv67AKxVW0oVCq3wA2z4x0Y4vEx4A2jsIEc7CjxVAFwI0_ GcCE3s1ln4kS14v26r1Y6r17M2AIxVAIcxkEcVAq07x20xvEncxIr21l57IF6xkI12xvs2 x26I8E6xACxx1l5I8CrVACY4xI64kE6c02F40Ex7xfMcIj6xIIjxv20xvE14v26r1q6rW5 McIj6I8E87Iv67AKxVWUJVW8JwAm72CE4IkC6x0Yz7v_Jr0_Gr1lF7xvr2IYc2Ij64vIr4 1lc7CjxVAaw2AFwI0_JF0_Jw1l42xK82IYc2Ij64vIr41l4I8I3I0E4IkC6x0Yz7v_Jr0_ Gr1l4IxYO2xFxVAFwI0_Jrv_JF1lx2IqxVAqx4xG67AKxVWUJVWUGwC20s026x8GjcxK67 AKxVWUGVWUWwC2zVAF1VAY17CE14v26r1q6r43MIIYrxkI7VAKI48JMIIF0xvE2Ix0cI8I cVAFwI0_JFI_Gr1lIxAIcVC0I7IYx2IY6xkF7I0E14v26r4j6F4UMIIF0xvE42xK8VAvwI 8IcIk0rVWUJVWUCwCI42IY6I8E87Iv67AKxVWUJVW8JwCI42IY6I8E87Iv6xkF7I0E14v2 6r4j6r4UJbIYCTnIWIevJa73UjIFyTuYvjxUc-VyUUUUU 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-3C6000 CPUs. It supports multiple sub-devices like DRM. Co-developed-by: Chong Qiao Signed-off-by: Chong Qiao Signed-off-by: Binbin Zhou --- drivers/mfd/Kconfig | 13 ++++ drivers/mfd/Makefile | 2 + drivers/mfd/ls2kbmc-mfd.c | 156 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 171 insertions(+) create mode 100644 drivers/mfd/ls2kbmc-mfd.c diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index 22b936310039..04e40085441d 100644 --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig @@ -2422,5 +2422,18 @@ config MFD_UPBOARD_FPGA To compile this driver as a module, choose M here: the module will be called upboard-fpga. =20 +config MFD_LS2K_BMC + tristate "Loongson-2K Board Management Controller Support" + depends on LOONGARCH + default y if LOONGARCH + 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 DRM. + This driver provides common support for accessing the devices; + additional drivers must be enabled in order to use the + functionality of the BMC device. + endmenu endif diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile index 948cbdf42a18..18960ea13b64 100644 --- a/drivers/mfd/Makefile +++ b/drivers/mfd/Makefile @@ -290,3 +290,5 @@ obj-$(CONFIG_MFD_RSMU_I2C) +=3D rsmu_i2c.o rsmu_core.o obj-$(CONFIG_MFD_RSMU_SPI) +=3D rsmu_spi.o rsmu_core.o =20 obj-$(CONFIG_MFD_UPBOARD_FPGA) +=3D upboard-fpga.o + +obj-$(CONFIG_MFD_LS2K_BMC) +=3D ls2kbmc-mfd.o diff --git a/drivers/mfd/ls2kbmc-mfd.c b/drivers/mfd/ls2kbmc-mfd.c new file mode 100644 index 000000000000..b309f6132c24 --- /dev/null +++ b/drivers/mfd/ls2kbmc-mfd.c @@ -0,0 +1,156 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Loongson-2K Board Management Controller (BMC) MFD Core Driver. + * + * Copyright (C) 2024 Loongson Technology Corporation Limited. + * + * Originally written by Chong Qiao + * Rewritten for mainline by Binbin Zhou + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#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-2K0500 BMC hardware does not have an i2c interfa= ce to + * adapt to the resolution. + * We set the resolution by presetting "video=3D1280x1024-16@2M" to the bm= c memory. + */ +static int ls2k_bmc_get_video_mode(struct pci_dev *pdev, struct simplefb_p= latform_data *pd) +{ + char *mode; + int depth, ret; + + /* The pci mem bar last 16M is used to store the string. */ + mode =3D devm_ioremap(&pdev->dev, pci_resource_start(pdev, 0) + SZ_16M, S= Z_16M); + if (!mode) + return -ENOMEM; + + /* env at last 16M's beginning, first env is "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) +{ + int ret =3D 0; + resource_size_t base; + struct simplefb_platform_data pd; + + ret =3D pci_enable_device(dev); + if (ret) + return ret; + + ret =3D ls2k_bmc_get_video_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, "Remove firmware framebuffers failed: %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 driver"); +MODULE_AUTHOR("Loongson Technology Corporation Limited"); +MODULE_LICENSE("GPL"); --=20 2.47.1