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 <qiaochong@xxxxxxxxxxx>
Signed-off-by: Chong Qiao <qiaochong@xxxxxxxxxxx>
Signed-off-by: Binbin Zhou <zhoubinbin@xxxxxxxxxxx>
---
drivers/mfd/Kconfig | 15 ++++
drivers/mfd/Makefile | 2 +
drivers/mfd/ls2kbmc-mfd.c | 145 ++++++++++++++++++++++++++++++++++++++
3 files changed, 162 insertions(+)
create mode 100644 drivers/mfd/ls2kbmc-mfd.c
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index ae23b317a64e..97d9d52b7e8a 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -2414,5 +2414,20 @@ config MFD_RSMU_SPI
Additional drivers must be enabled in order to use the functionality
of the device.
+config MFD_LS2K_BMC
+ tristate "Loongson-2K Board Management Controller Support"
+ depends on 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.
+
+ This driver can also be built as a module. If so the module
+ will be called ls2kbmc-mfd.
+
endmenu
endif
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index e057d6d6faef..3faec9638303 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -290,3 +290,5 @@ obj-$(CONFIG_MFD_ATC260X_I2C) += atc260x-i2c.o
obj-$(CONFIG_MFD_RSMU_I2C) += rsmu_i2c.o rsmu_core.o
obj-$(CONFIG_MFD_RSMU_SPI) += rsmu_spi.o rsmu_core.o
+
+obj-$(CONFIG_MFD_LS2K_BMC) += ls2kbmc-mfd.o
diff --git a/drivers/mfd/ls2kbmc-mfd.c b/drivers/mfd/ls2kbmc-mfd.c
new file mode 100644
index 000000000000..2912112c41c8
--- /dev/null
+++ b/drivers/mfd/ls2kbmc-mfd.c
@@ -0,0 +1,145 @@
+// 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 <qiaochong@xxxxxxxxxxx>
+ * Rewritten for mainline by Binbin Zhou <zhoubinbin@xxxxxxxxxxx>
+ */
+
+#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_device.h>
+
+static struct resource ls2k_display_resources[] = {
+ {
+ .name = "ls2kbmc-simplebuf-res",
+ .start = SZ_16M + SZ_2M,
+ .end = SZ_16M + SZ_2M + SZ_4M - 1,
+ .flags = IORESOURCE_MEM,
+ },
+};
+
+static struct resource ls2k_ipmi0_resources[] = {
+ {
+ .name = "ipmi-res0",
+ .start = SZ_16M + 0x00f00000,
+ .end = SZ_16M + 0x00f00000 + 0x1c - 1,
+ .flags = IORESOURCE_MEM,
+ },
+};
+
+static struct resource ls2k_ipmi1_resources[] = {
+ {
+ .name = "ipmi-res1",
+ .start = SZ_16M + 0x00f00000 + 0x1c,
+ .end = SZ_16M + 0x00f00000 + 0x1c * 2 - 1,
+ .flags = IORESOURCE_MEM,
+ },
+};
+
+static struct resource ls2k_ipmi2_resources[] = {
+ {
+ .name = "ipmi-res2",
+ .start = SZ_16M + 0x00f00000 + 0x1c * 2,
+ .end = SZ_16M + 0x00f00000 + 0x1c * 3 - 1,
+ .flags = IORESOURCE_MEM,
+ },
+};
+
+static struct resource ls2k_ipmi3_resources[] = {
+ {
+ .name = "ipmi-res3",
+ .start = SZ_16M + 0x00f00000 + 0x1c * 3,
+ .end = SZ_16M + 0x00f00000 + 0x1c * 4 - 1,
+ .flags = IORESOURCE_MEM,
+ },
+};
+
+static struct resource ls2k_ipmi4_resources[] = {
+ {
+ .name = "ipmi-res4",
+ .start = SZ_16M + 0x00f00000 + 0x1c * 4,
+ .end = SZ_16M + 0x00f00000 + 0x1c * 5 - 1,
+ .flags = IORESOURCE_MEM,
+ },
+};
+
+static struct mfd_cell ls2k_bmc_cells[] = {
+ {
+ .name = "ls2kbmc-framebuffer",
+ .num_resources = ARRAY_SIZE(ls2k_display_resources),
+ .resources = ls2k_display_resources,
+ },
+ {
+ .name = "ls2k-ipmi-si",
+ .num_resources = ARRAY_SIZE(ls2k_ipmi0_resources),
+ .resources = ls2k_ipmi0_resources,
+ },
+ {
+ .name = "ls2k-ipmi-si",
+ .num_resources = ARRAY_SIZE(ls2k_ipmi1_resources),
+ .resources = ls2k_ipmi1_resources,
+ },
+ {
+ .name = "ls2k-ipmi-si",
+ .num_resources = ARRAY_SIZE(ls2k_ipmi2_resources),
+ .resources = ls2k_ipmi2_resources,
+ },
+ {
+ .name = "ls2k-ipmi-si",
+ .num_resources = ARRAY_SIZE(ls2k_ipmi3_resources),
+ .resources = ls2k_ipmi3_resources,
+ },
+ {
+ .name = "ls2k-ipmi-si",
+ .num_resources = ARRAY_SIZE(ls2k_ipmi4_resources),
+ .resources = ls2k_ipmi4_resources,
+ },
+};
+
+static int ls2k_bmc_probe(struct pci_dev *dev, const struct pci_device_id *id)
+{
+ int ret = 0;
+
+ ret = pci_enable_device(dev);
+ if (ret)
+ return ret;
+
+ ls2k_bmc_cells[0].platform_data = &dev;
+ ls2k_bmc_cells[0].pdata_size = sizeof(dev);
+
+ return devm_mfd_add_devices(&dev->dev, PLATFORM_DEVID_AUTO,
+ ls2k_bmc_cells, ARRAY_SIZE(ls2k_bmc_cells),
+ &dev->resource[0], 0, NULL);
+}
+
+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 driver");
+MODULE_AUTHOR("Loongson Technology Corporation Limited");
+MODULE_LICENSE("GPL");
--
2.43.5
