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/config.h>
  11 #include <linux/init.h>
  12 #include <linux/stddef.h>
  13 #include <linux/fs.h>
  14 #include <linux/sched.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/tty.h>
  25 #include <linux/cpu.h>
  26 #include <linux/nodemask.h>
  27
  28 #include <asm/processor.h>
  29 #include <asm/pgtable.h>
  30 #include <asm/io.h>
  31 #include <asm/mmu_context.h>
  32 #include <asm/m32r.h>
  33 #include <asm/setup.h>
  34 #include <asm/sections.h>
  35
  36 #ifdef CONFIG_MMU
  37 extern void init_mmu(void);
  38 #endif
  39
  40 #if defined(CONFIG_BLK_DEV_IDE) || defined(CONFIG_BLK_DEV_HD)   \
  41         || defined(CONFIG_BLK_DEV_IDE_MODULE)                   \
  42         || defined(CONFIG_BLK_DEV_HD_MODULE)
  43 struct drive_info_struct { char dummy[32]; } drive_info;
  44 #endif
  45
  46 extern char _end[];
  47
  48 /*
  49  * Machine setup..
  50  */
  51 struct cpuinfo_m32r boot_cpu_data;
  52
  53 #ifdef CONFIG_BLK_DEV_RAM
  54 extern int rd_doload;   /* 1 = load ramdisk, 0 = don't load */
  55 extern int rd_prompt;   /* 1 = prompt for ramdisk, 0 = don't prompt */
  56 extern int rd_image_start;      /* starting block # of image */
  57 #endif
  58
  59 #if defined(CONFIG_VGA_CONSOLE)
  60 struct screen_info screen_info = {
  61         .orig_video_lines      = 25,
  62         .orig_video_cols       = 80,
  63         .orig_video_mode       = 0,
  64         .orig_video_ega_bx     = 0,
  65         .orig_video_isVGA      = 1,
  66         .orig_video_points     = 8
  67 };
  68 #endif
  69
  70 extern int root_mountflags;
  71
  72 static char command_line[COMMAND_LINE_SIZE];
  73
  74 static struct resource data_resource = {
  75         .name   = "Kernel data",
  76         .start  = 0,
  77         .end    = 0,
  78         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
  79 };
  80
  81 static struct resource code_resource = {
  82         .name   = "Kernel code",
  83         .start  = 0,
  84         .end    = 0,
  85         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
  86 };
  87
  88 unsigned long memory_start;
  89 unsigned long memory_end;
  90
  91 void __init setup_arch(char **);
  92 int get_cpuinfo(char *);
  93
  94 static __inline__ void parse_mem_cmdline(char ** cmdline_p)
  95 {
  96         char c = ' ';
  97         char *to = command_line;
  98         char *from = COMMAND_LINE;
  99         int len = 0;
 100         int usermem = 0;
 101
 102         /* Save unparsed command line copy for /proc/cmdline */
 103         memcpy(saved_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
 104         saved_command_line[COMMAND_LINE_SIZE-1] = '\0';
 105
 106         memory_start = (unsigned long)CONFIG_MEMORY_START+PAGE_OFFSET;
 107         memory_end = memory_start+(unsigned long)CONFIG_MEMORY_SIZE;
 108
 109         for ( ; ; ) {
 110                 if (c == ' ' && !memcmp(from, "mem=", 4)) {
 111                         if (to != command_line)
 112                                 to--;
 113
 114                         {
 115                                 unsigned long mem_size;
 116
 117                                 usermem = 1;
 118                                 mem_size = memparse(from+4, &from);
 119                                 memory_end = memory_start + mem_size;
 120                         }
 121                 }
 122                 c = *(from++);
 123                 if (!c)
 124                         break;
 125
 126                 if (COMMAND_LINE_SIZE <= ++len)
 127                         break;
 128
 129                 *(to++) = c;
 130         }
 131         *to = '\0';
 132         *cmdline_p = command_line;
 133         if (usermem)
 134                 printk(KERN_INFO "user-defined physical RAM map:\n");
 135 }
 136
 137 #ifndef CONFIG_DISCONTIGMEM
 138 static unsigned long __init setup_memory(void)
 139 {
 140         unsigned long start_pfn, max_low_pfn, bootmap_size;
 141
 142         start_pfn = PFN_UP( __pa(_end) );
 143         max_low_pfn = PFN_DOWN( __pa(memory_end) );
 144
 145         /*
 146          * Initialize the boot-time allocator (with low memory only):
 147          */
 148         bootmap_size = init_bootmem_node(NODE_DATA(0), start_pfn,
 149                 CONFIG_MEMORY_START>>PAGE_SHIFT, max_low_pfn);
 150
 151         /*
 152          * Register fully available low RAM pages with the bootmem allocator.
 153          */
 154         {
 155                 unsigned long curr_pfn;
 156                 unsigned long last_pfn;
 157                 unsigned long pages;
 158
 159                 /*
 160                  * We are rounding up the start address of usable memory:
 161                  */
 162                 curr_pfn = PFN_UP(__pa(memory_start));
 163
 164                 /*
 165                  * ... and at the end of the usable range downwards:
 166                  */
 167                 last_pfn = PFN_DOWN(__pa(memory_end));
 168
 169                 if (last_pfn > max_low_pfn)
 170                         last_pfn = max_low_pfn;
 171
 172                 pages = last_pfn - curr_pfn;
 173                 free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(pages));
 174         }
 175
 176         /*
 177          * Reserve the kernel text and
 178          * Reserve the bootmem bitmap. We do this in two steps (first step
 179          * was init_bootmem()), because this catches the (definitely buggy)
 180          * case of us accidentally initializing the bootmem allocator with
 181          * an invalid RAM area.
 182          */
 183         reserve_bootmem(CONFIG_MEMORY_START + PAGE_SIZE,
 184                 (PFN_PHYS(start_pfn) + bootmap_size + PAGE_SIZE - 1)
 185                 - CONFIG_MEMORY_START);
 186
 187         /*
 188          * reserve physical page 0 - it's a special BIOS page on many boxes,
 189          * enabling clean reboots, SMP operation, laptop functions.
 190          */
 191         reserve_bootmem(CONFIG_MEMORY_START, PAGE_SIZE);
 192
 193         /*
 194          * reserve memory hole
 195          */
 196 #ifdef CONFIG_MEMHOLE
 197         reserve_bootmem(CONFIG_MEMHOLE_START, CONFIG_MEMHOLE_SIZE);
 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                         initrd_start = INITRD_START ?
 205                                 INITRD_START + PAGE_OFFSET : 0;
 206
 207                         initrd_end = initrd_start + INITRD_SIZE;
 208                         printk("initrd:start[%08lx],size[%08lx]\n",
 209                                 initrd_start, INITRD_SIZE);
 210                 } else {
 211                         printk("initrd extends beyond end of memory "
 212                                 "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 213                                 INITRD_START + INITRD_SIZE,
 214                                 max_low_pfn << PAGE_SHIFT);
 215
 216                         initrd_start = 0;
 217                 }
 218         }
 219 #endif
 220
 221         return max_low_pfn;
 222 }
 223 #else   /* CONFIG_DISCONTIGMEM */
 224 extern unsigned long setup_memory(void);
 225 #endif  /* CONFIG_DISCONTIGMEM */
 226
 227 #define M32R_PCC_PCATCR 0x00ef7014      /* will move to m32r.h */
 228
 229 void __init setup_arch(char **cmdline_p)
 230 {
 231         ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
 232
 233         boot_cpu_data.cpu_clock = M32R_CPUCLK;
 234         boot_cpu_data.bus_clock = M32R_BUSCLK;
 235         boot_cpu_data.timer_divide = M32R_TIMER_DIVIDE;
 236
 237 #ifdef CONFIG_BLK_DEV_RAM
 238         rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
 239         rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
 240         rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
 241 #endif
 242
 243         if (!MOUNT_ROOT_RDONLY)
 244                 root_mountflags &= ~MS_RDONLY;
 245
 246 #ifdef CONFIG_VT
 247 #if defined(CONFIG_VGA_CONSOLE)
 248         conswitchp = &vga_con;
 249 #elif defined(CONFIG_DUMMY_CONSOLE)
 250         conswitchp = &dummy_con;
 251 #endif
 252 #endif
 253
 254 #ifdef CONFIG_DISCONTIGMEM
 255         nodes_clear(node_online_map);
 256         node_set_online(0);
 257         node_set_online(1);
 258 #endif  /* CONFIG_DISCONTIGMEM */
 259
 260         init_mm.start_code = (unsigned long) _text;
 261         init_mm.end_code = (unsigned long) _etext;
 262         init_mm.end_data = (unsigned long) _edata;
 263         init_mm.brk = (unsigned long) _end;
 264
 265         code_resource.start = virt_to_phys(_text);
 266         code_resource.end = virt_to_phys(_etext)-1;
 267         data_resource.start = virt_to_phys(_etext);
 268         data_resource.end = virt_to_phys(_edata)-1;
 269
 270         parse_mem_cmdline(cmdline_p);
 271
 272         setup_memory();
 273
 274         paging_init();
 275 }
 276
 277 static struct cpu cpu[NR_CPUS];
 278
 279 static int __init topology_init(void)
 280 {
 281         int cpu_id;
 282
 283         for (cpu_id = 0; cpu_id < NR_CPUS; cpu_id++)
 284                 if (cpu_possible(cpu_id))
 285                         register_cpu(&cpu[cpu_id], cpu_id, NULL);
 286
 287         return 0;
 288 }
 289
 290 subsys_initcall(topology_init);
 291
 292 #ifdef CONFIG_PROC_FS
 293 /*
 294  *      Get CPU information for use by the procfs.
 295  */
 296 static int show_cpuinfo(struct seq_file *m, void *v)
 297 {
 298         struct cpuinfo_m32r *c = v;
 299         unsigned long cpu = c - cpu_data;
 300
 301 #ifdef CONFIG_SMP
 302         if (!cpu_online(cpu))
 303                 return 0;
 304 #endif  /* CONFIG_SMP */
 305
 306         seq_printf(m, "processor\t: %ld\n", cpu);
 307
 308 #if defined(CONFIG_CHIP_VDEC2)
 309         seq_printf(m, "cpu family\t: VDEC2\n"
 310                 "cache size\t: Unknown\n");
 311 #elif defined(CONFIG_CHIP_M32700)
 312         seq_printf(m,"cpu family\t: M32700\n"
 313                 "cache size\t: I-8KB/D-8KB\n");
 314 #elif defined(CONFIG_CHIP_M32102)
 315         seq_printf(m,"cpu family\t: M32102\n"
 316                 "cache size\t: I-8KB\n");
 317 #elif defined(CONFIG_CHIP_OPSP)
 318         seq_printf(m,"cpu family\t: OPSP\n"
 319                 "cache size\t: I-8KB/D-8KB\n");
 320 #elif defined(CONFIG_CHIP_MP)
 321         seq_printf(m, "cpu family\t: M32R-MP\n"
 322                 "cache size\t: I-xxKB/D-xxKB\n");
 323 #elif  defined(CONFIG_CHIP_M32104)
 324         seq_printf(m,"cpu family\t: M32104\n"
 325                 "cache size\t: I-8KB/D-8KB\n");
 326 #else
 327         seq_printf(m, "cpu family\t: Unknown\n");
 328 #endif
 329         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 330                 c->loops_per_jiffy/(500000/HZ),
 331                 (c->loops_per_jiffy/(5000/HZ)) % 100);
 332 #if defined(CONFIG_PLAT_MAPPI)
 333         seq_printf(m, "Machine\t\t: Mappi Evaluation board\n");
 334 #elif defined(CONFIG_PLAT_MAPPI2)
 335         seq_printf(m, "Machine\t\t: Mappi-II Evaluation board\n");
 336 #elif defined(CONFIG_PLAT_MAPPI3)
 337         seq_printf(m, "Machine\t\t: Mappi-III Evaluation board\n");
 338 #elif defined(CONFIG_PLAT_M32700UT)
 339         seq_printf(m, "Machine\t\t: M32700UT Evaluation board\n");
 340 #elif defined(CONFIG_PLAT_OPSPUT)
 341         seq_printf(m, "Machine\t\t: OPSPUT Evaluation board\n");
 342 #elif defined(CONFIG_PLAT_USRV)
 343         seq_printf(m, "Machine\t\t: uServer\n");
 344 #elif defined(CONFIG_PLAT_OAKS32R)
 345         seq_printf(m, "Machine\t\t: OAKS32R\n");
 346 #elif  defined(CONFIG_PLAT_M32104UT)
 347         seq_printf(m, "Machine\t\t: M3T-M32104UT uT Engine board\n");
 348 #else
 349         seq_printf(m, "Machine\t\t: Unknown\n");
 350 #endif
 351
 352 #define PRINT_CLOCK(name, value)                                \
 353         seq_printf(m, name " clock\t: %d.%02dMHz\n",            \
 354                 ((value) / 1000000), ((value) % 1000000)/10000)
 355
 356         PRINT_CLOCK("CPU", (int)c->cpu_clock);
 357         PRINT_CLOCK("Bus", (int)c->bus_clock);
 358
 359         seq_printf(m, "\n");
 360
 361         return 0;
 362 }
 363
 364 static void *c_start(struct seq_file *m, loff_t *pos)
 365 {
 366         return *pos < NR_CPUS ? cpu_data + *pos : NULL;
 367 }
 368
 369 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 370 {
 371         ++*pos;
 372         return c_start(m, pos);
 373 }
 374
 375 static void c_stop(struct seq_file *m, void *v)
 376 {
 377 }
 378
 379 struct seq_operations cpuinfo_op = {
 380         start:  c_start,
 381         next:   c_next,
 382         stop:   c_stop,
 383         show:   show_cpuinfo,
 384 };
 385 #endif  /* CONFIG_PROC_FS */
 386
 387 unsigned long cpu_initialized __initdata = 0;
 388
 389 /*
 390  * cpu_init() initializes state that is per-CPU. Some data is already
 391  * initialized (naturally) in the bootstrap process.
 392  * We reload them nevertheless, this function acts as a
 393  * 'CPU state barrier', nothing should get across.
 394  */
 395 #if defined(CONFIG_CHIP_VDEC2) || defined(CONFIG_CHIP_XNUX2)    \
 396         || defined(CONFIG_CHIP_M32700) || defined(CONFIG_CHIP_M32102) \
 397         || defined(CONFIG_CHIP_OPSP) || defined(CONFIG_CHIP_M32104)
 398 void __init cpu_init (void)
 399 {
 400         int cpu_id = smp_processor_id();
 401
 402         if (test_and_set_bit(cpu_id, &cpu_initialized)) {
 403                 printk(KERN_WARNING "CPU#%d already initialized!\n", cpu_id);
 404                 for ( ; ; )
 405                         local_irq_enable();
 406         }
 407         printk(KERN_INFO "Initializing CPU#%d\n", cpu_id);
 408
 409         /* Set up and load the per-CPU TSS and LDT */
 410         atomic_inc(&init_mm.mm_count);
 411         current->active_mm = &init_mm;
 412         if (current->mm)
 413                 BUG();
 414
 415         /* Force FPU initialization */
 416         current_thread_info()->status = 0;
 417         clear_used_math();
 418
 419 #ifdef CONFIG_MMU
 420         /* Set up MMU */
 421         init_mmu();
 422 #endif
 423
 424         /* Set up ICUIMASK */
 425         outl(0x00070000, M32R_ICU_IMASK_PORTL);         /* imask=111 */
 426 }
 427 #endif  /* defined(CONFIG_CHIP_VDEC2) ... */