setup.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  linux/arch/h8300/kernel/setup.c
   4  *
   5  *  Copyright (C) 2001-2014 Yoshinori Sato <ysato@users.sourceforge.jp>
   6  */
   7
   8 /*
   9  * This file handles the architecture-dependent parts of system setup
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/sched.h>
  14 #include <linux/delay.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/io.h>
  17 #include <linux/mm.h>
  18 #include <linux/fs.h>
  19 #include <linux/console.h>
  20 #include <linux/errno.h>
  21 #include <linux/string.h>
  22 #include <linux/seq_file.h>
  23 #include <linux/init.h>
  24 #include <linux/of.h>
  25 #include <linux/of_fdt.h>
  26 #include <linux/of_address.h>
  27 #include <linux/clk-provider.h>
  28 #include <linux/memblock.h>
  29 #include <linux/screen_info.h>
  30 #include <linux/clocksource.h>
  31
  32 #include <asm/setup.h>
  33 #include <asm/irq.h>
  34 #include <asm/sections.h>
  35 #include <asm/page.h>
  36
  37 #if defined(CONFIG_CPU_H8300H)
  38 #define CPU "H8/300H"
  39 #elif defined(CONFIG_CPU_H8S)
  40 #define CPU "H8S"
  41 #else
  42 #define CPU "Unknown"
  43 #endif
  44
  45 unsigned long memory_start;
  46 unsigned long memory_end;
  47 EXPORT_SYMBOL(memory_end);
  48 static unsigned long freq;
  49 extern char __dtb_start[];
  50
  51 #ifdef CONFIG_VT
  52 struct screen_info screen_info;
  53 #endif
  54
  55 char __initdata command_line[COMMAND_LINE_SIZE];
  56
  57 void sim_console_register(void);
  58
  59 void __init h8300_fdt_init(void *fdt, char *bootargs)
  60 {
  61         if (!fdt)
  62                 fdt = __dtb_start;
  63         else
  64                 strcpy(command_line, bootargs);
  65
  66         early_init_dt_scan(fdt);
  67         memblock_allow_resize();
  68 }
  69
  70 static void __init bootmem_init(void)
  71 {
  72         memory_end = memory_start = 0;
  73
  74         /* Find main memory where is the kernel */
  75         memory_start = memblock_start_of_DRAM();
  76         memory_end = memblock_end_of_DRAM();
  77
  78         if (!memory_end)
  79                 panic("No memory!");
  80
  81         /* setup bootmem globals (we use no_bootmem, but mm still depends on this) */
  82         min_low_pfn = PFN_UP(memory_start);
  83         max_low_pfn = PFN_DOWN(memory_end);
  84         max_pfn = max_low_pfn;
  85
  86         memblock_reserve(__pa(_stext), _end - _stext);
  87
  88         early_init_fdt_reserve_self();
  89         early_init_fdt_scan_reserved_mem();
  90
  91         memblock_dump_all();
  92 }
  93
  94 void __init setup_arch(char **cmdline_p)
  95 {
  96         unflatten_and_copy_device_tree();
  97
  98         setup_initial_init_mm(_stext, _etext, _edata, NULL);
  99
 100         pr_notice("\r\n\nuClinux " CPU "\n");
 101         pr_notice("Flat model support (C) 1998,1999 Kenneth Albanowski, D. Jeff Dionne\n");
 102
 103         if (*command_line)
 104                 strcpy(boot_command_line, command_line);
 105         *cmdline_p = boot_command_line;
 106
 107         parse_early_param();
 108
 109         bootmem_init();
 110         /*
 111          * get kmalloc into gear
 112          */
 113         paging_init();
 114 }
 115
 116 /*
 117  *      Get CPU information for use by the procfs.
 118  */
 119
 120 static int show_cpuinfo(struct seq_file *m, void *v)
 121 {
 122         char *cpu;
 123
 124         cpu = CPU;
 125
 126         seq_printf(m,  "CPU:\t\t%s\n"
 127                    "Clock:\t\t%lu.%1luMHz\n"
 128                    "BogoMips:\t%lu.%02lu\n"
 129                    "Calibration:\t%lu loops\n",
 130                    cpu,
 131                    freq/1000, freq%1000,
 132                    (loops_per_jiffy*HZ)/500000,
 133                    ((loops_per_jiffy*HZ)/5000)%100,
 134                    (loops_per_jiffy*HZ));
 135
 136         return 0;
 137 }
 138
 139 static void *c_start(struct seq_file *m, loff_t *pos)
 140 {
 141         return *pos < num_possible_cpus() ?
 142                 ((void *) 0x12345678) : NULL;
 143 }
 144
 145 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 146 {
 147         ++*pos;
 148         return c_start(m, pos);
 149 }
 150
 151 static void c_stop(struct seq_file *m, void *v)
 152 {
 153 }
 154
 155 const struct seq_operations cpuinfo_op = {
 156         .start  = c_start,
 157         .next   = c_next,
 158         .stop   = c_stop,
 159         .show   = show_cpuinfo,
 160 };
 161
 162 #if defined(CONFIG_CPU_H8300H)
 163 #define get_wait(base, addr) ({         \
 164         int baddr;                      \
 165         baddr = ((addr) / 0x200000 * 2);                             \
 166         w *= (readw((base) + 2) & (3 << baddr)) + 1;                 \
 167         })
 168 #endif
 169 #if defined(CONFIG_CPU_H8S)
 170 #define get_wait(base, addr) ({         \
 171         int baddr;                      \
 172         baddr = ((addr) / 0x200000 * 16);                            \
 173         w *= (readl((base) + 2) & (7 << baddr)) + 1;    \
 174         })
 175 #endif
 176
 177 static __init int access_timing(void)
 178 {
 179         struct device_node *bsc;
 180         void __iomem *base;
 181         unsigned long addr = (unsigned long)&__delay;
 182         int bit = 1 << (addr / 0x200000);
 183         int w;
 184
 185         bsc = of_find_compatible_node(NULL, NULL, "renesas,h8300-bsc");
 186         base = of_iomap(bsc, 0);
 187         w = (readb(base + 0) & bit)?2:1;
 188         if (readb(base + 1) & bit)
 189                 w *= get_wait(base, addr);
 190         else
 191                 w *= 2;
 192         return w * 3 / 2;
 193 }
 194
 195 void __init calibrate_delay(void)
 196 {
 197         struct device_node *cpu;
 198         int freq;
 199
 200         cpu = of_find_compatible_node(NULL, NULL, "renesas,h8300");
 201         of_property_read_s32(cpu, "clock-frequency", &freq);
 202         loops_per_jiffy = freq / HZ / (access_timing() * 2);
 203         pr_cont("%lu.%02lu BogoMIPS (lpj=%lu)\n",
 204                 loops_per_jiffy / (500000 / HZ),
 205                 (loops_per_jiffy / (5000 / HZ)) % 100, loops_per_jiffy);
 206 }
 207
 208
 209 void __init time_init(void)
 210 {
 211         of_clk_init(NULL);
 212         timer_probe();
 213 }