arch/h8300/kernel/setup.c

   1 /*
   2  *  linux/arch/h8300/kernel/setup.c
   3  *
   4  *  Copyright (C) 2001-2014 Yoshinori Sato <ysato@users.sourceforge.jp>
   5  */
   6
   7 /*
   8  * This file handles the architecture-dependent parts of system setup
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/sched.h>
  13 #include <linux/delay.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/mm.h>
  16 #include <linux/fs.h>
  17 #include <linux/console.h>
  18 #include <linux/errno.h>
  19 #include <linux/string.h>
  20 #include <linux/bootmem.h>
  21 #include <linux/seq_file.h>
  22 #include <linux/init.h>
  23 #include <linux/of.h>
  24 #include <linux/of_fdt.h>
  25 #include <linux/of_platform.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/pgtable.h>
  35 #include <asm/sections.h>
  36 #include <asm/page.h>
  37
  38 #if defined(CONFIG_CPU_H8300H)
  39 #define CPU "H8/300H"
  40 #elif defined(CONFIG_CPU_H8S)
  41 #define CPU "H8S"
  42 #else
  43 #define CPU "Unknown"
  44 #endif
  45
  46 unsigned long memory_start;
  47 unsigned long memory_end;
  48 EXPORT_SYMBOL(memory_end);
  49 static unsigned long freq;
  50 extern char __dtb_start[];
  51
  52 #ifdef CONFIG_VT
  53 struct screen_info screen_info;
  54 #endif
  55
  56 char __initdata command_line[COMMAND_LINE_SIZE];
  57
  58 void sim_console_register(void);
  59
  60 void __init h8300_fdt_init(void *fdt, char *bootargs)
  61 {
  62         if (!fdt)
  63                 fdt = __dtb_start;
  64         else
  65                 strcpy(command_line, bootargs);
  66
  67         early_init_dt_scan(fdt);
  68         memblock_allow_resize();
  69 }
  70
  71 static void __init bootmem_init(void)
  72 {
  73         int bootmap_size;
  74         unsigned long ram_start_pfn;
  75         unsigned long free_ram_start_pfn;
  76         unsigned long ram_end_pfn;
  77         struct memblock_region *region;
  78
  79         memory_end = memory_start = 0;
  80
  81         /* Find main memory where is the kernel */
  82         for_each_memblock(memory, region) {
  83                 memory_start = region->base;
  84                 memory_end = region->base + region->size;
  85         }
  86
  87         if (!memory_end)
  88                 panic("No memory!");
  89
  90         ram_start_pfn = PFN_UP(memory_start);
  91         /* free_ram_start_pfn is first page after kernel */
  92         free_ram_start_pfn = PFN_UP(__pa(_end));
  93         ram_end_pfn = PFN_DOWN(memblock_end_of_DRAM());
  94
  95         max_pfn = ram_end_pfn;
  96
  97         /*
  98          * give all the memory to the bootmap allocator,  tell it to put the
  99          * boot mem_map at the start of memory
 100          */
 101         bootmap_size = init_bootmem_node(NODE_DATA(0),
 102                                          free_ram_start_pfn,
 103                                          0,
 104                                          ram_end_pfn);
 105         /*
 106          * free the usable memory,  we have to make sure we do not free
 107          * the bootmem bitmap so we then reserve it after freeing it :-)
 108          */
 109         free_bootmem(PFN_PHYS(free_ram_start_pfn),
 110                      (ram_end_pfn - free_ram_start_pfn) << PAGE_SHIFT);
 111         reserve_bootmem(PFN_PHYS(free_ram_start_pfn), bootmap_size,
 112                         BOOTMEM_DEFAULT);
 113
 114         for_each_memblock(reserved, region) {
 115                 reserve_bootmem(region->base, region->size, BOOTMEM_DEFAULT);
 116         }
 117 }
 118
 119 void __init setup_arch(char **cmdline_p)
 120 {
 121         unflatten_and_copy_device_tree();
 122
 123         init_mm.start_code = (unsigned long) _stext;
 124         init_mm.end_code = (unsigned long) _etext;
 125         init_mm.end_data = (unsigned long) _edata;
 126         init_mm.brk = (unsigned long) 0;
 127
 128         pr_notice("\r\n\nuClinux " CPU "\n");
 129         pr_notice("Flat model support (C) 1998,1999 Kenneth Albanowski, D. Jeff Dionne\n");
 130
 131         if (*command_line)
 132                 strcpy(boot_command_line, command_line);
 133         *cmdline_p = boot_command_line;
 134
 135         parse_early_param();
 136
 137         bootmem_init();
 138         /*
 139          * get kmalloc into gear
 140          */
 141         paging_init();
 142 }
 143
 144 /*
 145  *      Get CPU information for use by the procfs.
 146  */
 147
 148 static int show_cpuinfo(struct seq_file *m, void *v)
 149 {
 150         char *cpu;
 151
 152         cpu = CPU;
 153
 154         seq_printf(m,  "CPU:\t\t%s\n"
 155                    "Clock:\t\t%lu.%1luMHz\n"
 156                    "BogoMips:\t%lu.%02lu\n"
 157                    "Calibration:\t%lu loops\n",
 158                    cpu,
 159                    freq/1000, freq%1000,
 160                    (loops_per_jiffy*HZ)/500000,
 161                    ((loops_per_jiffy*HZ)/5000)%100,
 162                    (loops_per_jiffy*HZ));
 163
 164         return 0;
 165 }
 166
 167 static void *c_start(struct seq_file *m, loff_t *pos)
 168 {
 169         return *pos < num_possible_cpus() ?
 170                 ((void *) 0x12345678) : NULL;
 171 }
 172
 173 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 174 {
 175         ++*pos;
 176         return c_start(m, pos);
 177 }
 178
 179 static void c_stop(struct seq_file *m, void *v)
 180 {
 181 }
 182
 183 const struct seq_operations cpuinfo_op = {
 184         .start  = c_start,
 185         .next   = c_next,
 186         .stop   = c_stop,
 187         .show   = show_cpuinfo,
 188 };
 189
 190 static int __init device_probe(void)
 191 {
 192         of_platform_populate(NULL, NULL, NULL, NULL);
 193
 194         return 0;
 195 }
 196
 197 device_initcall(device_probe);
 198
 199 #if defined(CONFIG_CPU_H8300H)
 200 #define get_wait(base, addr) ({         \
 201         int baddr;                      \
 202         baddr = ((addr) / 0x200000 * 2);                             \
 203         w *= (readw((base) + 2) & (3 << baddr)) + 1;                 \
 204         })
 205 #endif
 206 #if defined(CONFIG_CPU_H8S)
 207 #define get_wait(base, addr) ({         \
 208         int baddr;                      \
 209         baddr = ((addr) / 0x200000 * 16);                            \
 210         w *= (readl((base) + 2) & (7 << baddr)) + 1;    \
 211         })
 212 #endif
 213
 214 static __init int access_timing(void)
 215 {
 216         struct device_node *bsc;
 217         void __iomem *base;
 218         unsigned long addr = (unsigned long)&__delay;
 219         int bit = 1 << (addr / 0x200000);
 220         int w;
 221
 222         bsc = of_find_compatible_node(NULL, NULL, "renesas,h8300-bsc");
 223         base = of_iomap(bsc, 0);
 224         w = (readb(base + 0) & bit)?2:1;
 225         if (readb(base + 1) & bit)
 226                 w *= get_wait(base, addr);
 227         else
 228                 w *= 2;
 229         return w * 3 / 2;
 230 }
 231
 232 void __init calibrate_delay(void)
 233 {
 234         struct device_node *cpu;
 235         int freq;
 236
 237         cpu = of_find_compatible_node(NULL, NULL, "renesas,h8300");
 238         of_property_read_s32(cpu, "clock-frequency", &freq);
 239         loops_per_jiffy = freq / HZ / (access_timing() * 2);
 240         pr_cont("%lu.%02lu BogoMIPS (lpj=%lu)\n",
 241                 loops_per_jiffy / (500000 / HZ),
 242                 (loops_per_jiffy / (5000 / HZ)) % 100, loops_per_jiffy);
 243 }
 244
 245
 246 void __init time_init(void)
 247 {
 248         of_clk_init(NULL);
 249         clocksource_probe();
 250 }