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 extern char _end[];
  41
  42 /*
  43  * Machine setup..
  44  */
  45 struct cpuinfo_m32r boot_cpu_data;
  46
  47 #ifdef CONFIG_BLK_DEV_RAM
  48 extern int rd_doload;   /* 1 = load ramdisk, 0 = don't load */
  49 extern int rd_prompt;   /* 1 = prompt for ramdisk, 0 = don't prompt */
  50 extern int rd_image_start;      /* starting block # of image */
  51 #endif
  52
  53 #if defined(CONFIG_VGA_CONSOLE)
  54 struct screen_info screen_info = {
  55         .orig_video_lines      = 25,
  56         .orig_video_cols       = 80,
  57         .orig_video_mode       = 0,
  58         .orig_video_ega_bx     = 0,
  59         .orig_video_isVGA      = 1,
  60         .orig_video_points     = 8
  61 };
  62 #endif
  63
  64 extern int root_mountflags;
  65
  66 static char command_line[COMMAND_LINE_SIZE];
  67
  68 static struct resource data_resource = {
  69         .name   = "Kernel data",
  70         .start  = 0,
  71         .end    = 0,
  72         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
  73 };
  74
  75 static struct resource code_resource = {
  76         .name   = "Kernel code",
  77         .start  = 0,
  78         .end    = 0,
  79         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
  80 };
  81
  82 unsigned long memory_start;
  83 unsigned long memory_end;
  84
  85 void __init setup_arch(char **);
  86 int get_cpuinfo(char *);
  87
  88 static __inline__ void parse_mem_cmdline(char ** cmdline_p)
  89 {
  90         char c = ' ';
  91         char *to = command_line;
  92         char *from = COMMAND_LINE;
  93         int len = 0;
  94         int usermem = 0;
  95
  96         /* Save unparsed command line copy for /proc/cmdline */
  97         memcpy(saved_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
  98         saved_command_line[COMMAND_LINE_SIZE-1] = '\0';
  99
 100         memory_start = (unsigned long)CONFIG_MEMORY_START+PAGE_OFFSET;
 101         memory_end = memory_start+(unsigned long)CONFIG_MEMORY_SIZE;
 102
 103         for ( ; ; ) {
 104                 if (c == ' ' && !memcmp(from, "mem=", 4)) {
 105                         if (to != command_line)
 106                                 to--;
 107
 108                         {
 109                                 unsigned long mem_size;
 110
 111                                 usermem = 1;
 112                                 mem_size = memparse(from+4, &from);
 113                                 memory_end = memory_start + mem_size;
 114                         }
 115                 }
 116                 c = *(from++);
 117                 if (!c)
 118                         break;
 119
 120                 if (COMMAND_LINE_SIZE <= ++len)
 121                         break;
 122
 123                 *(to++) = c;
 124         }
 125         *to = '\0';
 126         *cmdline_p = command_line;
 127         if (usermem)
 128                 printk(KERN_INFO "user-defined physical RAM map:\n");
 129 }
 130
 131 #ifndef CONFIG_DISCONTIGMEM
 132 static unsigned long __init setup_memory(void)
 133 {
 134         unsigned long start_pfn, max_low_pfn, bootmap_size;
 135
 136         start_pfn = PFN_UP( __pa(_end) );
 137         max_low_pfn = PFN_DOWN( __pa(memory_end) );
 138
 139         /*
 140          * Initialize the boot-time allocator (with low memory only):
 141          */
 142         bootmap_size = init_bootmem_node(NODE_DATA(0), start_pfn,
 143                 CONFIG_MEMORY_START>>PAGE_SHIFT, max_low_pfn);
 144
 145         /*
 146          * Register fully available low RAM pages with the bootmem allocator.
 147          */
 148         {
 149                 unsigned long curr_pfn;
 150                 unsigned long last_pfn;
 151                 unsigned long pages;
 152
 153                 /*
 154                  * We are rounding up the start address of usable memory:
 155                  */
 156                 curr_pfn = PFN_UP(__pa(memory_start));
 157
 158                 /*
 159                  * ... and at the end of the usable range downwards:
 160                  */
 161                 last_pfn = PFN_DOWN(__pa(memory_end));
 162
 163                 if (last_pfn > max_low_pfn)
 164                         last_pfn = max_low_pfn;
 165
 166                 pages = last_pfn - curr_pfn;
 167                 free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(pages));
 168         }
 169
 170         /*
 171          * Reserve the kernel text and
 172          * Reserve the bootmem bitmap. We do this in two steps (first step
 173          * was init_bootmem()), because this catches the (definitely buggy)
 174          * case of us accidentally initializing the bootmem allocator with
 175          * an invalid RAM area.
 176          */
 177         reserve_bootmem(CONFIG_MEMORY_START + PAGE_SIZE,
 178                 (PFN_PHYS(start_pfn) + bootmap_size + PAGE_SIZE - 1)
 179                 - CONFIG_MEMORY_START);
 180
 181         /*
 182          * reserve physical page 0 - it's a special BIOS page on many boxes,
 183          * enabling clean reboots, SMP operation, laptop functions.
 184          */
 185         reserve_bootmem(CONFIG_MEMORY_START, PAGE_SIZE);
 186
 187         /*
 188          * reserve memory hole
 189          */
 190 #ifdef CONFIG_MEMHOLE
 191         reserve_bootmem(CONFIG_MEMHOLE_START, CONFIG_MEMHOLE_SIZE);
 192 #endif
 193
 194 #ifdef CONFIG_BLK_DEV_INITRD
 195         if (LOADER_TYPE && INITRD_START) {
 196                 if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
 197                         reserve_bootmem(INITRD_START, INITRD_SIZE);
 198                         initrd_start = INITRD_START ?
 199                                 INITRD_START + PAGE_OFFSET : 0;
 200
 201                         initrd_end = initrd_start + INITRD_SIZE;
 202                         printk("initrd:start[%08lx],size[%08lx]\n",
 203                                 initrd_start, INITRD_SIZE);
 204                 } else {
 205                         printk("initrd extends beyond end of memory "
 206                                 "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 207                                 INITRD_START + INITRD_SIZE,
 208                                 max_low_pfn << PAGE_SHIFT);
 209
 210                         initrd_start = 0;
 211                 }
 212         }
 213 #endif
 214
 215         return max_low_pfn;
 216 }
 217 #else   /* CONFIG_DISCONTIGMEM */
 218 extern unsigned long setup_memory(void);
 219 #endif  /* CONFIG_DISCONTIGMEM */
 220
 221 #define M32R_PCC_PCATCR 0x00ef7014      /* will move to m32r.h */
 222
 223 void __init setup_arch(char **cmdline_p)
 224 {
 225         ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
 226
 227         boot_cpu_data.cpu_clock = M32R_CPUCLK;
 228         boot_cpu_data.bus_clock = M32R_BUSCLK;
 229         boot_cpu_data.timer_divide = M32R_TIMER_DIVIDE;
 230
 231 #ifdef CONFIG_BLK_DEV_RAM
 232         rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
 233         rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
 234         rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
 235 #endif
 236
 237         if (!MOUNT_ROOT_RDONLY)
 238                 root_mountflags &= ~MS_RDONLY;
 239
 240 #ifdef CONFIG_VT
 241 #if defined(CONFIG_VGA_CONSOLE)
 242         conswitchp = &vga_con;
 243 #elif defined(CONFIG_DUMMY_CONSOLE)
 244         conswitchp = &dummy_con;
 245 #endif
 246 #endif
 247
 248 #ifdef CONFIG_DISCONTIGMEM
 249         nodes_clear(node_online_map);
 250         node_set_online(0);
 251         node_set_online(1);
 252 #endif  /* CONFIG_DISCONTIGMEM */
 253
 254         init_mm.start_code = (unsigned long) _text;
 255         init_mm.end_code = (unsigned long) _etext;
 256         init_mm.end_data = (unsigned long) _edata;
 257         init_mm.brk = (unsigned long) _end;
 258
 259         code_resource.start = virt_to_phys(_text);
 260         code_resource.end = virt_to_phys(_etext)-1;
 261         data_resource.start = virt_to_phys(_etext);
 262         data_resource.end = virt_to_phys(_edata)-1;
 263
 264         parse_mem_cmdline(cmdline_p);
 265
 266         setup_memory();
 267
 268         paging_init();
 269 }
 270
 271 static struct cpu cpu[NR_CPUS];
 272
 273 static int __init topology_init(void)
 274 {
 275         int cpu_id;
 276
 277         for (cpu_id = 0; cpu_id < NR_CPUS; cpu_id++)
 278                 if (cpu_possible(cpu_id))
 279                         register_cpu(&cpu[cpu_id], cpu_id, NULL);
 280
 281         return 0;
 282 }
 283
 284 subsys_initcall(topology_init);
 285
 286 #ifdef CONFIG_PROC_FS
 287 /*
 288  *      Get CPU information for use by the procfs.
 289  */
 290 static int show_cpuinfo(struct seq_file *m, void *v)
 291 {
 292         struct cpuinfo_m32r *c = v;
 293         unsigned long cpu = c - cpu_data;
 294
 295 #ifdef CONFIG_SMP
 296         if (!cpu_online(cpu))
 297                 return 0;
 298 #endif  /* CONFIG_SMP */
 299
 300         seq_printf(m, "processor\t: %ld\n", cpu);
 301
 302 #if defined(CONFIG_CHIP_VDEC2)
 303         seq_printf(m, "cpu family\t: VDEC2\n"
 304                 "cache size\t: Unknown\n");
 305 #elif defined(CONFIG_CHIP_M32700)
 306         seq_printf(m,"cpu family\t: M32700\n"
 307                 "cache size\t: I-8KB/D-8KB\n");
 308 #elif defined(CONFIG_CHIP_M32102)
 309         seq_printf(m,"cpu family\t: M32102\n"
 310                 "cache size\t: I-8KB\n");
 311 #elif defined(CONFIG_CHIP_OPSP)
 312         seq_printf(m,"cpu family\t: OPSP\n"
 313                 "cache size\t: I-8KB/D-8KB\n");
 314 #elif defined(CONFIG_CHIP_MP)
 315         seq_printf(m, "cpu family\t: M32R-MP\n"
 316                 "cache size\t: I-xxKB/D-xxKB\n");
 317 #elif  defined(CONFIG_CHIP_M32104)
 318         seq_printf(m,"cpu family\t: M32104\n"
 319                 "cache size\t: I-8KB/D-8KB\n");
 320 #else
 321         seq_printf(m, "cpu family\t: Unknown\n");
 322 #endif
 323         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 324                 c->loops_per_jiffy/(500000/HZ),
 325                 (c->loops_per_jiffy/(5000/HZ)) % 100);
 326 #if defined(CONFIG_PLAT_MAPPI)
 327         seq_printf(m, "Machine\t\t: Mappi Evaluation board\n");
 328 #elif defined(CONFIG_PLAT_MAPPI2)
 329         seq_printf(m, "Machine\t\t: Mappi-II Evaluation board\n");
 330 #elif defined(CONFIG_PLAT_MAPPI3)
 331         seq_printf(m, "Machine\t\t: Mappi-III Evaluation board\n");
 332 #elif defined(CONFIG_PLAT_M32700UT)
 333         seq_printf(m, "Machine\t\t: M32700UT Evaluation board\n");
 334 #elif defined(CONFIG_PLAT_OPSPUT)
 335         seq_printf(m, "Machine\t\t: OPSPUT Evaluation board\n");
 336 #elif defined(CONFIG_PLAT_USRV)
 337         seq_printf(m, "Machine\t\t: uServer\n");
 338 #elif defined(CONFIG_PLAT_OAKS32R)
 339         seq_printf(m, "Machine\t\t: OAKS32R\n");
 340 #elif  defined(CONFIG_PLAT_M32104UT)
 341         seq_printf(m, "Machine\t\t: M3T-M32104UT uT Engine board\n");
 342 #else
 343         seq_printf(m, "Machine\t\t: Unknown\n");
 344 #endif
 345
 346 #define PRINT_CLOCK(name, value)                                \
 347         seq_printf(m, name " clock\t: %d.%02dMHz\n",            \
 348                 ((value) / 1000000), ((value) % 1000000)/10000)
 349
 350         PRINT_CLOCK("CPU", (int)c->cpu_clock);
 351         PRINT_CLOCK("Bus", (int)c->bus_clock);
 352
 353         seq_printf(m, "\n");
 354
 355         return 0;
 356 }
 357
 358 static void *c_start(struct seq_file *m, loff_t *pos)
 359 {
 360         return *pos < NR_CPUS ? cpu_data + *pos : NULL;
 361 }
 362
 363 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 364 {
 365         ++*pos;
 366         return c_start(m, pos);
 367 }
 368
 369 static void c_stop(struct seq_file *m, void *v)
 370 {
 371 }
 372
 373 struct seq_operations cpuinfo_op = {
 374         start:  c_start,
 375         next:   c_next,
 376         stop:   c_stop,
 377         show:   show_cpuinfo,
 378 };
 379 #endif  /* CONFIG_PROC_FS */
 380
 381 unsigned long cpu_initialized __initdata = 0;
 382
 383 /*
 384  * cpu_init() initializes state that is per-CPU. Some data is already
 385  * initialized (naturally) in the bootstrap process.
 386  * We reload them nevertheless, this function acts as a
 387  * 'CPU state barrier', nothing should get across.
 388  */
 389 #if defined(CONFIG_CHIP_VDEC2) || defined(CONFIG_CHIP_XNUX2)    \
 390         || defined(CONFIG_CHIP_M32700) || defined(CONFIG_CHIP_M32102) \
 391         || defined(CONFIG_CHIP_OPSP) || defined(CONFIG_CHIP_M32104)
 392 void __init cpu_init (void)
 393 {
 394         int cpu_id = smp_processor_id();
 395
 396         if (test_and_set_bit(cpu_id, &cpu_initialized)) {
 397                 printk(KERN_WARNING "CPU#%d already initialized!\n", cpu_id);
 398                 for ( ; ; )
 399                         local_irq_enable();
 400         }
 401         printk(KERN_INFO "Initializing CPU#%d\n", cpu_id);
 402
 403         /* Set up and load the per-CPU TSS and LDT */
 404         atomic_inc(&init_mm.mm_count);
 405         current->active_mm = &init_mm;
 406         if (current->mm)
 407                 BUG();
 408
 409         /* Force FPU initialization */
 410         current_thread_info()->status = 0;
 411         clear_used_math();
 412
 413 #ifdef CONFIG_MMU
 414         /* Set up MMU */
 415         init_mmu();
 416 #endif
 417
 418         /* Set up ICUIMASK */
 419         outl(0x00070000, M32R_ICU_IMASK_PORTL);         /* imask=111 */
 420 }
 421 #endif  /* defined(CONFIG_CHIP_VDEC2) ... */