arch/h8300/kernel/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/mm.h>
  17 #include <linux/fs.h>
  18 #include <linux/console.h>
  19 #include <linux/errno.h>
  20 #include <linux/string.h>
  21 #include <linux/bootmem.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_platform.h>
  27 #include <linux/of_address.h>
  28 #include <linux/clk-provider.h>
  29 #include <linux/memblock.h>
  30 #include <linux/screen_info.h>
  31 #include <linux/clocksource.h>
  32
  33 #include <asm/setup.h>
  34 #include <asm/irq.h>
  35 #include <asm/pgtable.h>
  36 #include <asm/sections.h>
  37 #include <asm/page.h>
  38
  39 #if defined(CONFIG_CPU_H8300H)
  40 #define CPU "H8/300H"
  41 #elif defined(CONFIG_CPU_H8S)
  42 #define CPU "H8S"
  43 #else
  44 #define CPU "Unknown"
  45 #endif
  46
  47 unsigned long memory_start;
  48 unsigned long memory_end;
  49 EXPORT_SYMBOL(memory_end);
  50 static unsigned long freq;
  51 extern char __dtb_start[];
  52
  53 #ifdef CONFIG_VT
  54 struct screen_info screen_info;
  55 #endif
  56
  57 char __initdata command_line[COMMAND_LINE_SIZE];
  58
  59 void sim_console_register(void);
  60
  61 void __init h8300_fdt_init(void *fdt, char *bootargs)
  62 {
  63         if (!fdt)
  64                 fdt = __dtb_start;
  65         else
  66                 strcpy(command_line, bootargs);
  67
  68         early_init_dt_scan(fdt);
  69         memblock_allow_resize();
  70 }
  71
  72 static void __init bootmem_init(void)
  73 {
  74         int bootmap_size;
  75         unsigned long ram_start_pfn;
  76         unsigned long free_ram_start_pfn;
  77         unsigned long ram_end_pfn;
  78         struct memblock_region *region;
  79
  80         memory_end = memory_start = 0;
  81
  82         /* Find main memory where is the kernel */
  83         for_each_memblock(memory, region) {
  84                 memory_start = region->base;
  85                 memory_end = region->base + region->size;
  86         }
  87
  88         if (!memory_end)
  89                 panic("No memory!");
  90
  91         ram_start_pfn = PFN_UP(memory_start);
  92         /* free_ram_start_pfn is first page after kernel */
  93         free_ram_start_pfn = PFN_UP(__pa(_end));
  94         ram_end_pfn = PFN_DOWN(memblock_end_of_DRAM());
  95
  96         max_pfn = ram_end_pfn;
  97
  98         /*
  99          * give all the memory to the bootmap allocator,  tell it to put the
 100          * boot mem_map at the start of memory
 101          */
 102         bootmap_size = init_bootmem_node(NODE_DATA(0),
 103                                          free_ram_start_pfn,
 104                                          0,
 105                                          ram_end_pfn);
 106         /*
 107          * free the usable memory,  we have to make sure we do not free
 108          * the bootmem bitmap so we then reserve it after freeing it :-)
 109          */
 110         free_bootmem(PFN_PHYS(free_ram_start_pfn),
 111                      (ram_end_pfn - free_ram_start_pfn) << PAGE_SHIFT);
 112         reserve_bootmem(PFN_PHYS(free_ram_start_pfn), bootmap_size,
 113                         BOOTMEM_DEFAULT);
 114
 115         for_each_memblock(reserved, region) {
 116                 reserve_bootmem(region->base, region->size, BOOTMEM_DEFAULT);
 117         }
 118 }
 119
 120 void __init setup_arch(char **cmdline_p)
 121 {
 122         unflatten_and_copy_device_tree();
 123
 124         init_mm.start_code = (unsigned long) _stext;
 125         init_mm.end_code = (unsigned long) _etext;
 126         init_mm.end_data = (unsigned long) _edata;
 127         init_mm.brk = (unsigned long) 0;
 128
 129         pr_notice("\r\n\nuClinux " CPU "\n");
 130         pr_notice("Flat model support (C) 1998,1999 Kenneth Albanowski, D. Jeff Dionne\n");
 131
 132         if (*command_line)
 133                 strcpy(boot_command_line, command_line);
 134         *cmdline_p = boot_command_line;
 135
 136         parse_early_param();
 137
 138         bootmem_init();
 139         /*
 140          * get kmalloc into gear
 141          */
 142         paging_init();
 143 }
 144
 145 /*
 146  *      Get CPU information for use by the procfs.
 147  */
 148
 149 static int show_cpuinfo(struct seq_file *m, void *v)
 150 {
 151         char *cpu;
 152
 153         cpu = CPU;
 154
 155         seq_printf(m,  "CPU:\t\t%s\n"
 156                    "Clock:\t\t%lu.%1luMHz\n"
 157                    "BogoMips:\t%lu.%02lu\n"
 158                    "Calibration:\t%lu loops\n",
 159                    cpu,
 160                    freq/1000, freq%1000,
 161                    (loops_per_jiffy*HZ)/500000,
 162                    ((loops_per_jiffy*HZ)/5000)%100,
 163                    (loops_per_jiffy*HZ));
 164
 165         return 0;
 166 }
 167
 168 static void *c_start(struct seq_file *m, loff_t *pos)
 169 {
 170         return *pos < num_possible_cpus() ?
 171                 ((void *) 0x12345678) : NULL;
 172 }
 173
 174 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 175 {
 176         ++*pos;
 177         return c_start(m, pos);
 178 }
 179
 180 static void c_stop(struct seq_file *m, void *v)
 181 {
 182 }
 183
 184 const struct seq_operations cpuinfo_op = {
 185         .start  = c_start,
 186         .next   = c_next,
 187         .stop   = c_stop,
 188         .show   = show_cpuinfo,
 189 };
 190
 191 static int __init device_probe(void)
 192 {
 193         of_platform_populate(NULL, NULL, NULL, NULL);
 194
 195         return 0;
 196 }
 197
 198 device_initcall(device_probe);
 199
 200 #if defined(CONFIG_CPU_H8300H)
 201 #define get_wait(base, addr) ({         \
 202         int baddr;                      \
 203         baddr = ((addr) / 0x200000 * 2);                             \
 204         w *= (readw((base) + 2) & (3 << baddr)) + 1;                 \
 205         })
 206 #endif
 207 #if defined(CONFIG_CPU_H8S)
 208 #define get_wait(base, addr) ({         \
 209         int baddr;                      \
 210         baddr = ((addr) / 0x200000 * 16);                            \
 211         w *= (readl((base) + 2) & (7 << baddr)) + 1;    \
 212         })
 213 #endif
 214
 215 static __init int access_timing(void)
 216 {
 217         struct device_node *bsc;
 218         void __iomem *base;
 219         unsigned long addr = (unsigned long)&__delay;
 220         int bit = 1 << (addr / 0x200000);
 221         int w;
 222
 223         bsc = of_find_compatible_node(NULL, NULL, "renesas,h8300-bsc");
 224         base = of_iomap(bsc, 0);
 225         w = (readb(base + 0) & bit)?2:1;
 226         if (readb(base + 1) & bit)
 227                 w *= get_wait(base, addr);
 228         else
 229                 w *= 2;
 230         return w * 3 / 2;
 231 }
 232
 233 void __init calibrate_delay(void)
 234 {
 235         struct device_node *cpu;
 236         int freq;
 237
 238         cpu = of_find_compatible_node(NULL, NULL, "renesas,h8300");
 239         of_property_read_s32(cpu, "clock-frequency", &freq);
 240         loops_per_jiffy = freq / HZ / (access_timing() * 2);
 241         pr_cont("%lu.%02lu BogoMIPS (lpj=%lu)\n",
 242                 loops_per_jiffy / (500000 / HZ),
 243                 (loops_per_jiffy / (5000 / HZ)) % 100, loops_per_jiffy);
 244 }
 245
 246
 247 void __init time_init(void)
 248 {
 249         of_clk_init(NULL);
 250         timer_probe();
 251 }