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 <chenhua...@loongson.cn>
Co-developed-by: Chong Qiao <qiaoch...@loongson.cn>
Signed-off-by: Chong Qiao <qiaoch...@loongson.cn>
Signed-off-by: Binbin Zhou <zhoubin...@loongson.cn>
---
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.
+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
interface
+ is enabled independently through the IPMI_LS2K option in the IPMI
section.
+
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-$(CONFIG_MFD_INTEL_M10_BMC_CORE) +=
intel-m10-bmc-core.o
obj-$(CONFIG_MFD_INTEL_M10_BMC_SPI) += intel-m10-bmc-spi.o
obj-$(CONFIG_MFD_INTEL_M10_BMC_PMCI) += intel-m10-bmc-pmci.o
+obj-$(CONFIG_MFD_LS2K_BMC_CORE) += ls2k-bmc-core.o
+
obj-$(CONFIG_MFD_ATC260X) += atc260x-core.o
obj-$(CONFIG_MFD_ATC260X_I2C) += atc260x-i2c.o
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 <qiaoch...@loongson.cn>
+ * Binbin Zhou <zhoubin...@loongson.cn>
+ */
+
+#include <linux/aperture.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/mfd/core.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/pci_ids.h>
+#include <linux/platform_data/simplefb.h>
+#include <linux/platform_device.h>
+
+/* 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[] = {
+ DEFINE_RES_MEM_NAMED(LS2K_DISPLAY_RES_START, SZ_4M, "simpledrm-res"),
+};
+
+static struct resource ls2k_ipmi0_resources[] = {
+ DEFINE_RES_MEM_NAMED(LS2K_IPMI0_RES_START, LS2K_IPMI_RES_SIZE,
"ipmi0-res"),
+};
+
+static struct resource ls2k_ipmi1_resources[] = {
+ DEFINE_RES_MEM_NAMED(LS2K_IPMI1_RES_START, LS2K_IPMI_RES_SIZE,
"ipmi1-res"),
+};
+
+static struct resource ls2k_ipmi2_resources[] = {
+ DEFINE_RES_MEM_NAMED(LS2K_IPMI2_RES_START, LS2K_IPMI_RES_SIZE,
"ipmi2-res"),
+};
+
+static struct resource ls2k_ipmi3_resources[] = {
+ DEFINE_RES_MEM_NAMED(LS2K_IPMI3_RES_START, LS2K_IPMI_RES_SIZE,
"ipmi3-res"),
+};
+
+static struct resource ls2k_ipmi4_resources[] = {
+ DEFINE_RES_MEM_NAMED(LS2K_IPMI4_RES_START, LS2K_IPMI_RES_SIZE,
"ipmi4-res"),
+};
+
+static struct mfd_cell ls2k_bmc_cells[] = {
+ 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 to
adapt to the
+ * resolution. We set the resolution by presetting "video=1280x1024-16@2M" to
the BMC memory.
+ */
+static int ls2k_bmc_parse_mode(struct pci_dev *pdev, struct
simplefb_platform_data *pd)
+{
+ char *mode;
+ int depth, ret;
+
+ /* The last 16M of PCI BAR0 is used to store the resolution string. */
+ mode = devm_ioremap(&pdev->dev, pci_resource_start(pdev, 0) + SZ_16M,
SZ_16M);
+ if (!mode)
+ return -ENOMEM;
+
+ /* The resolution field starts with the flag "video=". */
+ if (!strncmp(mode, "video=", 6))
+ mode = mode + 6;
+
+ ret = kstrtoint(strsep(&mode, "x"), 10, &pd->width);
+ if (ret)
+ return ret;
+
+ ret = kstrtoint(strsep(&mode, "-"), 10, &pd->height);
+ if (ret)
+ return ret;
+
+ ret = kstrtoint(strsep(&mode, "@"), 10, &depth);
+ if (ret)
+ return ret;
+
+ pd->stride = pd->width * depth / 8;
+ pd->format = depth == 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 = pci_enable_device(dev);
+ if (ret)
+ return ret;
+
+ ret = ls2k_bmc_parse_mode(dev, &pd);
+ if (ret)
+ goto disable_pci;
+
+ ls2k_bmc_cells[0].platform_data = &pd;
+ ls2k_bmc_cells[0].pdata_size = sizeof(pd);
+ base = dev->resource[0].start + LS2K_DISPLAY_RES_START;
+
+ /* Remove conflicting efifb device */
+ ret = aperture_remove_conflicting_devices(base, SZ_4M,
"simple-framebuffer");
+ 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[] = {
+ { PCI_DEVICE(PCI_VENDOR_ID_LOONGSON, 0x1a05) },
+ { }
+};
+MODULE_DEVICE_TABLE(pci, ls2k_bmc_devices);
+
+static struct pci_driver ls2k_bmc_driver = {
+ .name = "ls2k-bmc",
+ .id_table = ls2k_bmc_devices,
+ .probe = ls2k_bmc_probe,
+ .remove = 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");
--
2.47.1
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