1 files changed, 117 insertions, 0 deletions
diff --git a/arch/loongarch/kernel/env.c b/arch/loongarch/kernel/env.c
new file mode 100644
index 000000000000..23bd5ae2212c
--- /dev/null
+++ b/arch/loongarch/kernel/env.c
@@ -0,0 +1,117 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Author: Huacai Chen <chenhuacai@loongson.cn>
+ *
+ * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
+ */
+#include <linux/acpi.h>
+#include <linux/clk.h>
+#include <linux/efi.h>
+#include <linux/export.h>
+#include <linux/memblock.h>
+#include <linux/of_clk.h>
+#include <asm/early_ioremap.h>
+#include <asm/bootinfo.h>
+#include <asm/loongson.h>
+#include <asm/setup.h>
+#include <asm/time.h>
+
+u64 efi_system_table;
+struct loongson_system_configuration loongson_sysconf;
+EXPORT_SYMBOL(loongson_sysconf);
+
+void __init init_environ(void)
+{
+	int efi_boot = fw_arg0;
+	char *cmdline = early_memremap_ro(fw_arg1, COMMAND_LINE_SIZE);
+
+	if (efi_boot)
+		set_bit(EFI_BOOT, &efi.flags);
+	else
+		clear_bit(EFI_BOOT, &efi.flags);
+
+	strscpy(boot_command_line, cmdline, COMMAND_LINE_SIZE);
+	strscpy(init_command_line, cmdline, COMMAND_LINE_SIZE);
+	early_memunmap(cmdline, COMMAND_LINE_SIZE);
+
+	efi_system_table = fw_arg2;
+}
+
+static int __init init_cpu_fullname(void)
+{
+	int cpu, ret;
+	char *cpuname;
+	const char *model;
+	struct device_node *root;
+
+	/* Parsing cpuname from DTS model property */
+	root = of_find_node_by_path("/");
+	ret = of_property_read_string(root, "model", &model);
+	if (ret == 0) {
+		cpuname = kstrdup(model, GFP_KERNEL);
+		loongson_sysconf.cpuname = strsep(&cpuname, " ");
+	}
+	of_node_put(root);
+
+	if (loongson_sysconf.cpuname && !strncmp(loongson_sysconf.cpuname, "Loongson", 8)) {
+		for (cpu = 0; cpu < NR_CPUS; cpu++)
+			__cpu_full_name[cpu] = loongson_sysconf.cpuname;
+	}
+	return 0;
+}
+arch_initcall(init_cpu_fullname);
+
+static int __init fdt_cpu_clk_init(void)
+{
+	struct clk *clk;
+	struct device_node *np;
+
+	np = of_get_cpu_node(0, NULL);
+	if (!np)
+		return -ENODEV;
+
+	clk = of_clk_get(np, 0);
+	of_node_put(np);
+
+	if (IS_ERR(clk))
+		return -ENODEV;
+
+	cpu_clock_freq = clk_get_rate(clk);
+	clk_put(clk);
+
+	return 0;
+}
+late_initcall(fdt_cpu_clk_init);
+
+static ssize_t boardinfo_show(struct kobject *kobj,
+			      struct kobj_attribute *attr, char *buf)
+{
+	return sysfs_emit(buf,
+		"BIOS Information\n"
+		"Vendor\t\t\t: %s\n"
+		"Version\t\t\t: %s\n"
+		"ROM Size\t\t: %d KB\n"
+		"Release Date\t\t: %s\n\n"
+		"Board Information\n"
+		"Manufacturer\t\t: %s\n"
+		"Board Name\t\t: %s\n"
+		"Family\t\t\t: LOONGSON64\n\n",
+		b_info.bios_vendor, b_info.bios_version,
+		b_info.bios_size, b_info.bios_release_date,
+		b_info.board_vendor, b_info.board_name);
+}
+
+static struct kobj_attribute boardinfo_attr = __ATTR(boardinfo, 0444,
+						     boardinfo_show, NULL);
+
+static int __init boardinfo_init(void)
+{
+	struct kobject *loongson_kobj;
+
+	loongson_kobj = kobject_create_and_add("loongson", firmware_kobj);
+	if (!loongson_kobj)
+		return -ENOMEM;
+
+	return sysfs_create_file(loongson_kobj, &boardinfo_attr.attr);
+}
+late_initcall(boardinfo_init);