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