--- /dev/null
+// 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 <qiaochong@loongson.cn>
+ * Binbin Zhou <zhoubinbin@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)
+
+enum {
+ LS2K_BMC_DISPLAY,
+ LS2K_BMC_IPMI0,
+ LS2K_BMC_IPMI1,
+ LS2K_BMC_IPMI2,
+ LS2K_BMC_IPMI3,
+ LS2K_BMC_IPMI4,
+};
+
+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[] = {
+ [LS2K_BMC_DISPLAY] = {
+ .name = "simple-framebuffer",
+ .num_resources = ARRAY_SIZE(ls2k_display_resources),
+ .resources = ls2k_display_resources
+ },
+ [LS2K_BMC_IPMI0] = {
+ .name = "ls2k-ipmi-si",
+ .num_resources = ARRAY_SIZE(ls2k_ipmi0_resources),
+ .resources = ls2k_ipmi0_resources
+ },
+ [LS2K_BMC_IPMI1] = {
+ .name = "ls2k-ipmi-si",
+ .num_resources = ARRAY_SIZE(ls2k_ipmi1_resources),
+ .resources = ls2k_ipmi1_resources
+ },
+ [LS2K_BMC_IPMI2] = {
+ .name = "ls2k-ipmi-si",
+ .num_resources = ARRAY_SIZE(ls2k_ipmi2_resources),
+ .resources = ls2k_ipmi2_resources
+ },
+ [LS2K_BMC_IPMI3] = {
+ .name = "ls2k-ipmi-si",
+ .num_resources = ARRAY_SIZE(ls2k_ipmi3_resources),
+ .resources = ls2k_ipmi3_resources
+ },
+ [LS2K_BMC_IPMI4] = {
+ .name = "ls2k-ipmi-si",
+ .num_resources = ARRAY_SIZE(ls2k_ipmi4_resources),
+ .resources = 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[LS2K_BMC_DISPLAY].platform_data = &pd;
+ ls2k_bmc_cells[LS2K_BMC_DISPLAY].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 Board Management Controller (BMC) Core driver");
+MODULE_AUTHOR("Loongson Technology Corporation Limited");
+MODULE_LICENSE("GPL");
projects / thirdparty / kernel / stable.git / commitdiff
