arch/loongarch/kernel/env.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Author: Huacai Chen <[email protected]>
   4  *
   5  * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
   6  */
   7 #include <linux/acpi.h>
   8 #include <linux/clk.h>
   9 #include <linux/efi.h>
  10 #include <linux/export.h>
  11 #include <linux/memblock.h>
  12 #include <linux/of_clk.h>
  13 #include <asm/early_ioremap.h>
  14 #include <asm/bootinfo.h>
  15 #include <asm/loongson.h>
  16 #include <asm/setup.h>
  17 #include <asm/time.h>
  18
  19 u64 efi_system_table;
  20 struct loongson_system_configuration loongson_sysconf;
  21 EXPORT_SYMBOL(loongson_sysconf);
  22
  23 void __init init_environ(void)
  24 {
  25         int efi_boot = fw_arg0;
  26         char *cmdline = early_memremap_ro(fw_arg1, COMMAND_LINE_SIZE);
  27
  28         if (efi_boot)
  29                 set_bit(EFI_BOOT, &efi.flags);
  30         else
  31                 clear_bit(EFI_BOOT, &efi.flags);
  32
  33         strscpy(boot_command_line, cmdline, COMMAND_LINE_SIZE);
  34         strscpy(init_command_line, cmdline, COMMAND_LINE_SIZE);
  35         early_memunmap(cmdline, COMMAND_LINE_SIZE);
  36
  37         efi_system_table = fw_arg2;
  38 }
  39
  40 static int __init init_cpu_fullname(void)
  41 {
  42         struct device_node *root;
  43         int cpu, ret;
  44         char *model;
  45
  46         /* Parsing cpuname from DTS model property */
  47         root = of_find_node_by_path("/");
  48         ret = of_property_read_string(root, "model", (const char **)&model);
  49         of_node_put(root);
  50         if (ret == 0)
  51                 loongson_sysconf.cpuname = strsep(&model, " ");
  52
  53         if (loongson_sysconf.cpuname && !strncmp(loongson_sysconf.cpuname, "Loongson", 8)) {
  54                 for (cpu = 0; cpu < NR_CPUS; cpu++)
  55                         __cpu_full_name[cpu] = loongson_sysconf.cpuname;
  56         }
  57         return 0;
  58 }
  59 arch_initcall(init_cpu_fullname);
  60
  61 static int __init fdt_cpu_clk_init(void)
  62 {
  63         struct clk *clk;
  64         struct device_node *np;
  65
  66         np = of_get_cpu_node(0, NULL);
  67         if (!np)
  68                 return -ENODEV;
  69
  70         clk = of_clk_get(np, 0);
  71         if (IS_ERR(clk))
  72                 return -ENODEV;
  73
  74         cpu_clock_freq = clk_get_rate(clk);
  75         clk_put(clk);
  76
  77         return 0;
  78 }
  79 late_initcall(fdt_cpu_clk_init);
  80
  81 static ssize_t boardinfo_show(struct kobject *kobj,
  82                               struct kobj_attribute *attr, char *buf)
  83 {
  84         return sprintf(buf,
  85                 "BIOS Information\n"
  86                 "Vendor\t\t\t: %s\n"
  87                 "Version\t\t\t: %s\n"
  88                 "ROM Size\t\t: %d KB\n"
  89                 "Release Date\t\t: %s\n\n"
  90                 "Board Information\n"
  91                 "Manufacturer\t\t: %s\n"
  92                 "Board Name\t\t: %s\n"
  93                 "Family\t\t\t: LOONGSON64\n\n",
  94                 b_info.bios_vendor, b_info.bios_version,
  95                 b_info.bios_size, b_info.bios_release_date,
  96                 b_info.board_vendor, b_info.board_name);
  97 }
  98
  99 static struct kobj_attribute boardinfo_attr = __ATTR(boardinfo, 0444,
 100                                                      boardinfo_show, NULL);
 101
 102 static int __init boardinfo_init(void)
 103 {
 104         struct kobject *loongson_kobj;
 105
 106         loongson_kobj = kobject_create_and_add("loongson", firmware_kobj);
 107
 108         return sysfs_create_file(loongson_kobj, &boardinfo_attr.attr);
 109 }
 110 late_initcall(boardinfo_init);