arch/m32r/kernel/setup.c

   1 /*
   2  *  linux/arch/m32r/kernel/setup.c
   3  *
   4  *  Setup routines for Renesas M32R
   5  *
   6  *  Copyright (c) 2001, 2002  Hiroyuki Kondo, Hirokazu Takata,
   7  *                            Hitoshi Yamamoto
   8  */
   9
  10 #include <linux/init.h>
  11 #include <linux/kernel.h>
  12 #include <linux/stddef.h>
  13 #include <linux/fs.h>
  14 #include <linux/sched/mm.h>
  15 #include <linux/ioport.h>
  16 #include <linux/mm.h>
  17 #include <linux/bootmem.h>
  18 #include <linux/console.h>
  19 #include <linux/initrd.h>
  20 #include <linux/major.h>
  21 #include <linux/root_dev.h>
  22 #include <linux/seq_file.h>
  23 #include <linux/timex.h>
  24 #include <linux/screen_info.h>
  25 #include <linux/cpu.h>
  26 #include <linux/nodemask.h>
  27 #include <linux/pfn.h>
  28
  29 #include <asm/processor.h>
  30 #include <asm/pgtable.h>
  31 #include <asm/io.h>
  32 #include <asm/mmu_context.h>
  33 #include <asm/m32r.h>
  34 #include <asm/setup.h>
  35 #include <asm/sections.h>
  36
  37 #ifdef CONFIG_MMU
  38 extern void init_mmu(void);
  39 #endif
  40
  41 extern char _end[];
  42
  43 /*
  44  * Machine setup..
  45  */
  46 struct cpuinfo_m32r boot_cpu_data;
  47
  48 #ifdef CONFIG_BLK_DEV_RAM
  49 extern int rd_doload;   /* 1 = load ramdisk, 0 = don't load */
  50 extern int rd_prompt;   /* 1 = prompt for ramdisk, 0 = don't prompt */
  51 extern int rd_image_start;      /* starting block # of image */
  52 #endif
  53
  54 #if defined(CONFIG_VGA_CONSOLE)
  55 struct screen_info screen_info = {
  56         .orig_video_lines      = 25,
  57         .orig_video_cols       = 80,
  58         .orig_video_mode       = 0,
  59         .orig_video_ega_bx     = 0,
  60         .orig_video_isVGA      = 1,
  61         .orig_video_points     = 8
  62 };
  63 #endif
  64
  65 extern int root_mountflags;
  66
  67 static char __initdata command_line[COMMAND_LINE_SIZE];
  68
  69 static struct resource data_resource = {
  70         .name   = "Kernel data",
  71         .start  = 0,
  72         .end    = 0,
  73         .flags  = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM
  74 };
  75
  76 static struct resource code_resource = {
  77         .name   = "Kernel code",
  78         .start  = 0,
  79         .end    = 0,
  80         .flags  = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM
  81 };
  82
  83 unsigned long memory_start;
  84 EXPORT_SYMBOL(memory_start);
  85
  86 unsigned long memory_end;
  87 EXPORT_SYMBOL(memory_end);
  88
  89 void __init setup_arch(char **);
  90 int get_cpuinfo(char *);
  91
  92 static __inline__ void parse_mem_cmdline(char ** cmdline_p)
  93 {
  94         char c = ' ';
  95         char *to = command_line;
  96         char *from = COMMAND_LINE;
  97         int len = 0;
  98         int usermem = 0;
  99
 100         /* Save unparsed command line copy for /proc/cmdline */
 101         memcpy(boot_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
 102         boot_command_line[COMMAND_LINE_SIZE-1] = '\0';
 103
 104         memory_start = (unsigned long)CONFIG_MEMORY_START+PAGE_OFFSET;
 105         memory_end = memory_start+(unsigned long)CONFIG_MEMORY_SIZE;
 106
 107         for ( ; ; ) {
 108                 if (c == ' ' && !memcmp(from, "mem=", 4)) {
 109                         if (to != command_line)
 110                                 to--;
 111
 112                         {
 113                                 unsigned long mem_size;
 114
 115                                 usermem = 1;
 116                                 mem_size = memparse(from+4, &from);
 117                                 memory_end = memory_start + mem_size;
 118                         }
 119                 }
 120                 c = *(from++);
 121                 if (!c)
 122                         break;
 123
 124                 if (COMMAND_LINE_SIZE <= ++len)
 125                         break;
 126
 127                 *(to++) = c;
 128         }
 129         *to = '\0';
 130         *cmdline_p = command_line;
 131         if (usermem)
 132                 printk(KERN_INFO "user-defined physical RAM map:\n");
 133 }
 134
 135 #ifndef CONFIG_DISCONTIGMEM
 136 static unsigned long __init setup_memory(void)
 137 {
 138         unsigned long start_pfn, max_low_pfn, bootmap_size;
 139
 140         start_pfn = PFN_UP( __pa(_end) );
 141         max_low_pfn = PFN_DOWN( __pa(memory_end) );
 142
 143         /*
 144          * Initialize the boot-time allocator (with low memory only):
 145          */
 146         bootmap_size = init_bootmem_node(NODE_DATA(0), start_pfn,
 147                 CONFIG_MEMORY_START>>PAGE_SHIFT, max_low_pfn);
 148
 149         /*
 150          * Register fully available low RAM pages with the bootmem allocator.
 151          */
 152         {
 153                 unsigned long curr_pfn;
 154                 unsigned long last_pfn;
 155                 unsigned long pages;
 156
 157                 /*
 158                  * We are rounding up the start address of usable memory:
 159                  */
 160                 curr_pfn = PFN_UP(__pa(memory_start));
 161
 162                 /*
 163                  * ... and at the end of the usable range downwards:
 164                  */
 165                 last_pfn = PFN_DOWN(__pa(memory_end));
 166
 167                 if (last_pfn > max_low_pfn)
 168                         last_pfn = max_low_pfn;
 169
 170                 pages = last_pfn - curr_pfn;
 171                 free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(pages));
 172         }
 173
 174         /*
 175          * Reserve the kernel text and
 176          * Reserve the bootmem bitmap. We do this in two steps (first step
 177          * was init_bootmem()), because this catches the (definitely buggy)
 178          * case of us accidentally initializing the bootmem allocator with
 179          * an invalid RAM area.
 180          */
 181         reserve_bootmem(CONFIG_MEMORY_START + PAGE_SIZE,
 182                 (PFN_PHYS(start_pfn) + bootmap_size + PAGE_SIZE - 1)
 183                 - CONFIG_MEMORY_START,
 184                 BOOTMEM_DEFAULT);
 185
 186         /*
 187          * reserve physical page 0 - it's a special BIOS page on many boxes,
 188          * enabling clean reboots, SMP operation, laptop functions.
 189          */
 190         reserve_bootmem(CONFIG_MEMORY_START, PAGE_SIZE, BOOTMEM_DEFAULT);
 191
 192         /*
 193          * reserve memory hole
 194          */
 195 #ifdef CONFIG_MEMHOLE
 196         reserve_bootmem(CONFIG_MEMHOLE_START, CONFIG_MEMHOLE_SIZE,
 197                         BOOTMEM_DEFAULT);
 198 #endif
 199
 200 #ifdef CONFIG_BLK_DEV_INITRD
 201         if (LOADER_TYPE && INITRD_START) {
 202                 if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
 203                         reserve_bootmem(INITRD_START, INITRD_SIZE,
 204                                         BOOTMEM_DEFAULT);
 205                         initrd_start = INITRD_START + PAGE_OFFSET;
 206                         initrd_end = initrd_start + INITRD_SIZE;
 207                         printk("initrd:start[%08lx],size[%08lx]\n",
 208                                 initrd_start, INITRD_SIZE);
 209                 } else {
 210                         printk("initrd extends beyond end of memory "
 211                                 "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 212                                 INITRD_START + INITRD_SIZE,
 213                                 max_low_pfn << PAGE_SHIFT);
 214
 215                         initrd_start = 0;
 216                 }
 217         }
 218 #endif
 219
 220         return max_low_pfn;
 221 }
 222 #else   /* CONFIG_DISCONTIGMEM */
 223 extern unsigned long setup_memory(void);
 224 #endif  /* CONFIG_DISCONTIGMEM */
 225
 226 void __init setup_arch(char **cmdline_p)
 227 {
 228         ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
 229
 230         boot_cpu_data.cpu_clock = M32R_CPUCLK;
 231         boot_cpu_data.bus_clock = M32R_BUSCLK;
 232         boot_cpu_data.timer_divide = M32R_TIMER_DIVIDE;
 233
 234 #ifdef CONFIG_BLK_DEV_RAM
 235         rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
 236         rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
 237         rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
 238 #endif
 239
 240         if (!MOUNT_ROOT_RDONLY)
 241                 root_mountflags &= ~MS_RDONLY;
 242
 243 #ifdef CONFIG_VT
 244 #if defined(CONFIG_VGA_CONSOLE)
 245         conswitchp = &vga_con;
 246 #elif defined(CONFIG_DUMMY_CONSOLE)
 247         conswitchp = &dummy_con;
 248 #endif
 249 #endif
 250
 251 #ifdef CONFIG_DISCONTIGMEM
 252         nodes_clear(node_online_map);
 253         node_set_online(0);
 254         node_set_online(1);
 255 #endif  /* CONFIG_DISCONTIGMEM */
 256
 257         init_mm.start_code = (unsigned long) _text;
 258         init_mm.end_code = (unsigned long) _etext;
 259         init_mm.end_data = (unsigned long) _edata;
 260         init_mm.brk = (unsigned long) _end;
 261
 262         code_resource.start = virt_to_phys(_text);
 263         code_resource.end = virt_to_phys(_etext)-1;
 264         data_resource.start = virt_to_phys(_etext);
 265         data_resource.end = virt_to_phys(_edata)-1;
 266
 267         parse_mem_cmdline(cmdline_p);
 268
 269         setup_memory();
 270
 271         paging_init();
 272 }
 273
 274 static struct cpu cpu_devices[NR_CPUS];
 275
 276 static int __init topology_init(void)
 277 {
 278         int i;
 279
 280         for_each_present_cpu(i)
 281                 register_cpu(&cpu_devices[i], i);
 282
 283         return 0;
 284 }
 285
 286 subsys_initcall(topology_init);
 287
 288 #ifdef CONFIG_PROC_FS
 289 /*
 290  *      Get CPU information for use by the procfs.
 291  */
 292 static int show_cpuinfo(struct seq_file *m, void *v)
 293 {
 294         struct cpuinfo_m32r *c = v;
 295         unsigned long cpu = c - cpu_data;
 296
 297 #ifdef CONFIG_SMP
 298         if (!cpu_online(cpu))
 299                 return 0;
 300 #endif  /* CONFIG_SMP */
 301
 302         seq_printf(m, "processor\t: %ld\n", cpu);
 303
 304 #if defined(CONFIG_CHIP_VDEC2)
 305         seq_printf(m, "cpu family\t: VDEC2\n"
 306                 "cache size\t: Unknown\n");
 307 #elif defined(CONFIG_CHIP_M32700)
 308         seq_printf(m,"cpu family\t: M32700\n"
 309                 "cache size\t: I-8KB/D-8KB\n");
 310 #elif defined(CONFIG_CHIP_M32102)
 311         seq_printf(m,"cpu family\t: M32102\n"
 312                 "cache size\t: I-8KB\n");
 313 #elif defined(CONFIG_CHIP_OPSP)
 314         seq_printf(m,"cpu family\t: OPSP\n"
 315                 "cache size\t: I-8KB/D-8KB\n");
 316 #elif defined(CONFIG_CHIP_MP)
 317         seq_printf(m, "cpu family\t: M32R-MP\n"
 318                 "cache size\t: I-xxKB/D-xxKB\n");
 319 #elif  defined(CONFIG_CHIP_M32104)
 320         seq_printf(m,"cpu family\t: M32104\n"
 321                 "cache size\t: I-8KB/D-8KB\n");
 322 #else
 323         seq_printf(m, "cpu family\t: Unknown\n");
 324 #endif
 325         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 326                 c->loops_per_jiffy/(500000/HZ),
 327                 (c->loops_per_jiffy/(5000/HZ)) % 100);
 328 #if defined(CONFIG_PLAT_MAPPI)
 329         seq_printf(m, "Machine\t\t: Mappi Evaluation board\n");
 330 #elif defined(CONFIG_PLAT_MAPPI2)
 331         seq_printf(m, "Machine\t\t: Mappi-II Evaluation board\n");
 332 #elif defined(CONFIG_PLAT_MAPPI3)
 333         seq_printf(m, "Machine\t\t: Mappi-III Evaluation board\n");
 334 #elif defined(CONFIG_PLAT_M32700UT)
 335         seq_printf(m, "Machine\t\t: M32700UT Evaluation board\n");
 336 #elif defined(CONFIG_PLAT_OPSPUT)
 337         seq_printf(m, "Machine\t\t: OPSPUT Evaluation board\n");
 338 #elif defined(CONFIG_PLAT_USRV)
 339         seq_printf(m, "Machine\t\t: uServer\n");
 340 #elif defined(CONFIG_PLAT_OAKS32R)
 341         seq_printf(m, "Machine\t\t: OAKS32R\n");
 342 #elif  defined(CONFIG_PLAT_M32104UT)
 343         seq_printf(m, "Machine\t\t: M3T-M32104UT uT Engine board\n");
 344 #else
 345         seq_printf(m, "Machine\t\t: Unknown\n");
 346 #endif
 347
 348 #define PRINT_CLOCK(name, value)                                \
 349         seq_printf(m, name " clock\t: %d.%02dMHz\n",            \
 350                 ((value) / 1000000), ((value) % 1000000)/10000)
 351
 352         PRINT_CLOCK("CPU", (int)c->cpu_clock);
 353         PRINT_CLOCK("Bus", (int)c->bus_clock);
 354
 355         seq_printf(m, "\n");
 356
 357         return 0;
 358 }
 359
 360 static void *c_start(struct seq_file *m, loff_t *pos)
 361 {
 362         return *pos < NR_CPUS ? cpu_data + *pos : NULL;
 363 }
 364
 365 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 366 {
 367         ++*pos;
 368         return c_start(m, pos);
 369 }
 370
 371 static void c_stop(struct seq_file *m, void *v)
 372 {
 373 }
 374
 375 const struct seq_operations cpuinfo_op = {
 376         .start = c_start,
 377         .next = c_next,
 378         .stop = c_stop,
 379         .show = show_cpuinfo,
 380 };
 381 #endif  /* CONFIG_PROC_FS */
 382
 383 unsigned long cpu_initialized __initdata = 0;
 384
 385 /*
 386  * cpu_init() initializes state that is per-CPU. Some data is already
 387  * initialized (naturally) in the bootstrap process.
 388  * We reload them nevertheless, this function acts as a
 389  * 'CPU state barrier', nothing should get across.
 390  */
 391 #if defined(CONFIG_CHIP_VDEC2) || defined(CONFIG_CHIP_XNUX2)    \
 392         || defined(CONFIG_CHIP_M32700) || defined(CONFIG_CHIP_M32102) \
 393         || defined(CONFIG_CHIP_OPSP) || defined(CONFIG_CHIP_M32104)
 394 void __init cpu_init (void)
 395 {
 396         int cpu_id = smp_processor_id();
 397
 398         if (test_and_set_bit(cpu_id, &cpu_initialized)) {
 399                 printk(KERN_WARNING "CPU#%d already initialized!\n", cpu_id);
 400                 for ( ; ; )
 401                         local_irq_enable();
 402         }
 403         printk(KERN_INFO "Initializing CPU#%d\n", cpu_id);
 404
 405         /* Set up and load the per-CPU TSS and LDT */
 406         mmgrab(&init_mm);
 407         current->active_mm = &init_mm;
 408         if (current->mm)
 409                 BUG();
 410
 411         /* Force FPU initialization */
 412         current_thread_info()->status = 0;
 413         clear_used_math();
 414
 415 #ifdef CONFIG_MMU
 416         /* Set up MMU */
 417         init_mmu();
 418 #endif
 419
 420         /* Set up ICUIMASK */
 421         outl(0x00070000, M32R_ICU_IMASK_PORTL);         /* imask=111 */
 422 }
 423 #endif  /* defined(CONFIG_CHIP_VDEC2) ... */