arch/m32r/kernel/setup.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  linux/arch/m32r/kernel/setup.c
   4  *
   5  *  Setup routines for Renesas M32R
   6  *
   7  *  Copyright (c) 2001, 2002  Hiroyuki Kondo, Hirokazu Takata,
   8  *                            Hitoshi Yamamoto
   9  */
  10
  11 #include <linux/init.h>
  12 #include <linux/kernel.h>
  13 #include <linux/stddef.h>
  14 #include <linux/fs.h>
  15 #include <linux/sched/mm.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/screen_info.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 __initdata 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_SYSTEM_RAM
  75 };
  76
  77 static struct resource code_resource = {
  78         .name   = "Kernel code",
  79         .start  = 0,
  80         .end    = 0,
  81         .flags  = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM
  82 };
  83
  84 unsigned long memory_start;
  85 EXPORT_SYMBOL(memory_start);
  86
  87 unsigned long memory_end;
  88 EXPORT_SYMBOL(memory_end);
  89
  90 void __init setup_arch(char **);
  91 int get_cpuinfo(char *);
  92
  93 static __inline__ void parse_mem_cmdline(char ** cmdline_p)
  94 {
  95         char c = ' ';
  96         char *to = command_line;
  97         char *from = COMMAND_LINE;
  98         int len = 0;
  99         int usermem = 0;
 100
 101         /* Save unparsed command line copy for /proc/cmdline */
 102         memcpy(boot_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
 103         boot_command_line[COMMAND_LINE_SIZE-1] = '\0';
 104
 105         memory_start = (unsigned long)CONFIG_MEMORY_START+PAGE_OFFSET;
 106         memory_end = memory_start+(unsigned long)CONFIG_MEMORY_SIZE;
 107
 108         for ( ; ; ) {
 109                 if (c == ' ' && !memcmp(from, "mem=", 4)) {
 110                         if (to != command_line)
 111                                 to--;
 112
 113                         {
 114                                 unsigned long mem_size;
 115
 116                                 usermem = 1;
 117                                 mem_size = memparse(from+4, &from);
 118                                 memory_end = memory_start + mem_size;
 119                         }
 120                 }
 121                 c = *(from++);
 122                 if (!c)
 123                         break;
 124
 125                 if (COMMAND_LINE_SIZE <= ++len)
 126                         break;
 127
 128                 *(to++) = c;
 129         }
 130         *to = '\0';
 131         *cmdline_p = command_line;
 132         if (usermem)
 133                 printk(KERN_INFO "user-defined physical RAM map:\n");
 134 }
 135
 136 #ifndef CONFIG_DISCONTIGMEM
 137 static unsigned long __init setup_memory(void)
 138 {
 139         unsigned long start_pfn, max_low_pfn, bootmap_size;
 140
 141         start_pfn = PFN_UP( __pa(_end) );
 142         max_low_pfn = PFN_DOWN( __pa(memory_end) );
 143
 144         /*
 145          * Initialize the boot-time allocator (with low memory only):
 146          */
 147         bootmap_size = init_bootmem_node(NODE_DATA(0), start_pfn,
 148                 CONFIG_MEMORY_START>>PAGE_SHIFT, max_low_pfn);
 149
 150         /*
 151          * Register fully available low RAM pages with the bootmem allocator.
 152          */
 153         {
 154                 unsigned long curr_pfn;
 155                 unsigned long last_pfn;
 156                 unsigned long pages;
 157
 158                 /*
 159                  * We are rounding up the start address of usable memory:
 160                  */
 161                 curr_pfn = PFN_UP(__pa(memory_start));
 162
 163                 /*
 164                  * ... and at the end of the usable range downwards:
 165                  */
 166                 last_pfn = PFN_DOWN(__pa(memory_end));
 167
 168                 if (last_pfn > max_low_pfn)
 169                         last_pfn = max_low_pfn;
 170
 171                 pages = last_pfn - curr_pfn;
 172                 free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(pages));
 173         }
 174
 175         /*
 176          * Reserve the kernel text and
 177          * Reserve the bootmem bitmap. We do this in two steps (first step
 178          * was init_bootmem()), because this catches the (definitely buggy)
 179          * case of us accidentally initializing the bootmem allocator with
 180          * an invalid RAM area.
 181          */
 182         reserve_bootmem(CONFIG_MEMORY_START + PAGE_SIZE,
 183                 (PFN_PHYS(start_pfn) + bootmap_size + PAGE_SIZE - 1)
 184                 - CONFIG_MEMORY_START,
 185                 BOOTMEM_DEFAULT);
 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, BOOTMEM_DEFAULT);
 192
 193         /*
 194          * reserve memory hole
 195          */
 196 #ifdef CONFIG_MEMHOLE
 197         reserve_bootmem(CONFIG_MEMHOLE_START, CONFIG_MEMHOLE_SIZE,
 198                         BOOTMEM_DEFAULT);
 199 #endif
 200
 201 #ifdef CONFIG_BLK_DEV_INITRD
 202         if (LOADER_TYPE && INITRD_START) {
 203                 if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
 204                         reserve_bootmem(INITRD_START, INITRD_SIZE,
 205                                         BOOTMEM_DEFAULT);
 206                         initrd_start = INITRD_START + PAGE_OFFSET;
 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 void __init setup_arch(char **cmdline_p)
 228 {
 229         ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
 230
 231         boot_cpu_data.cpu_clock = M32R_CPUCLK;
 232         boot_cpu_data.bus_clock = M32R_BUSCLK;
 233         boot_cpu_data.timer_divide = M32R_TIMER_DIVIDE;
 234
 235 #ifdef CONFIG_BLK_DEV_RAM
 236         rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
 237         rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
 238         rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
 239 #endif
 240
 241         if (!MOUNT_ROOT_RDONLY)
 242                 root_mountflags &= ~MS_RDONLY;
 243
 244 #ifdef CONFIG_VT
 245 #if defined(CONFIG_VGA_CONSOLE)
 246         conswitchp = &vga_con;
 247 #elif defined(CONFIG_DUMMY_CONSOLE)
 248         conswitchp = &dummy_con;
 249 #endif
 250 #endif
 251
 252 #ifdef CONFIG_DISCONTIGMEM
 253         nodes_clear(node_online_map);
 254         node_set_online(0);
 255         node_set_online(1);
 256 #endif  /* CONFIG_DISCONTIGMEM */
 257
 258         init_mm.start_code = (unsigned long) _text;
 259         init_mm.end_code = (unsigned long) _etext;
 260         init_mm.end_data = (unsigned long) _edata;
 261         init_mm.brk = (unsigned long) _end;
 262
 263         code_resource.start = virt_to_phys(_text);
 264         code_resource.end = virt_to_phys(_etext)-1;
 265         data_resource.start = virt_to_phys(_etext);
 266         data_resource.end = virt_to_phys(_edata)-1;
 267
 268         parse_mem_cmdline(cmdline_p);
 269
 270         setup_memory();
 271
 272         paging_init();
 273 }
 274
 275 static struct cpu cpu_devices[NR_CPUS];
 276
 277 static int __init topology_init(void)
 278 {
 279         int i;
 280
 281         for_each_present_cpu(i)
 282                 register_cpu(&cpu_devices[i], i);
 283
 284         return 0;
 285 }
 286
 287 subsys_initcall(topology_init);
 288
 289 #ifdef CONFIG_PROC_FS
 290 /*
 291  *      Get CPU information for use by the procfs.
 292  */
 293 static int show_cpuinfo(struct seq_file *m, void *v)
 294 {
 295         struct cpuinfo_m32r *c = v;
 296         unsigned long cpu = c - cpu_data;
 297
 298 #ifdef CONFIG_SMP
 299         if (!cpu_online(cpu))
 300                 return 0;
 301 #endif  /* CONFIG_SMP */
 302
 303         seq_printf(m, "processor\t: %ld\n", cpu);
 304
 305 #if defined(CONFIG_CHIP_VDEC2)
 306         seq_printf(m, "cpu family\t: VDEC2\n"
 307                 "cache size\t: Unknown\n");
 308 #elif defined(CONFIG_CHIP_M32700)
 309         seq_printf(m,"cpu family\t: M32700\n"
 310                 "cache size\t: I-8KB/D-8KB\n");
 311 #elif defined(CONFIG_CHIP_M32102)
 312         seq_printf(m,"cpu family\t: M32102\n"
 313                 "cache size\t: I-8KB\n");
 314 #elif defined(CONFIG_CHIP_OPSP)
 315         seq_printf(m,"cpu family\t: OPSP\n"
 316                 "cache size\t: I-8KB/D-8KB\n");
 317 #elif defined(CONFIG_CHIP_MP)
 318         seq_printf(m, "cpu family\t: M32R-MP\n"
 319                 "cache size\t: I-xxKB/D-xxKB\n");
 320 #elif  defined(CONFIG_CHIP_M32104)
 321         seq_printf(m,"cpu family\t: M32104\n"
 322                 "cache size\t: I-8KB/D-8KB\n");
 323 #else
 324         seq_printf(m, "cpu family\t: Unknown\n");
 325 #endif
 326         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 327                 c->loops_per_jiffy/(500000/HZ),
 328                 (c->loops_per_jiffy/(5000/HZ)) % 100);
 329 #if defined(CONFIG_PLAT_MAPPI)
 330         seq_printf(m, "Machine\t\t: Mappi Evaluation board\n");
 331 #elif defined(CONFIG_PLAT_MAPPI2)
 332         seq_printf(m, "Machine\t\t: Mappi-II Evaluation board\n");
 333 #elif defined(CONFIG_PLAT_MAPPI3)
 334         seq_printf(m, "Machine\t\t: Mappi-III Evaluation board\n");
 335 #elif defined(CONFIG_PLAT_M32700UT)
 336         seq_printf(m, "Machine\t\t: M32700UT Evaluation board\n");
 337 #elif defined(CONFIG_PLAT_OPSPUT)
 338         seq_printf(m, "Machine\t\t: OPSPUT Evaluation board\n");
 339 #elif defined(CONFIG_PLAT_USRV)
 340         seq_printf(m, "Machine\t\t: uServer\n");
 341 #elif defined(CONFIG_PLAT_OAKS32R)
 342         seq_printf(m, "Machine\t\t: OAKS32R\n");
 343 #elif  defined(CONFIG_PLAT_M32104UT)
 344         seq_printf(m, "Machine\t\t: M3T-M32104UT uT Engine board\n");
 345 #else
 346         seq_printf(m, "Machine\t\t: Unknown\n");
 347 #endif
 348
 349 #define PRINT_CLOCK(name, value)                                \
 350         seq_printf(m, name " clock\t: %d.%02dMHz\n",            \
 351                 ((value) / 1000000), ((value) % 1000000)/10000)
 352
 353         PRINT_CLOCK("CPU", (int)c->cpu_clock);
 354         PRINT_CLOCK("Bus", (int)c->bus_clock);
 355
 356         seq_printf(m, "\n");
 357
 358         return 0;
 359 }
 360
 361 static void *c_start(struct seq_file *m, loff_t *pos)
 362 {
 363         return *pos < NR_CPUS ? cpu_data + *pos : NULL;
 364 }
 365
 366 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 367 {
 368         ++*pos;
 369         return c_start(m, pos);
 370 }
 371
 372 static void c_stop(struct seq_file *m, void *v)
 373 {
 374 }
 375
 376 const struct seq_operations cpuinfo_op = {
 377         .start = c_start,
 378         .next = c_next,
 379         .stop = c_stop,
 380         .show = show_cpuinfo,
 381 };
 382 #endif  /* CONFIG_PROC_FS */
 383
 384 unsigned long cpu_initialized __initdata = 0;
 385
 386 /*
 387  * cpu_init() initializes state that is per-CPU. Some data is already
 388  * initialized (naturally) in the bootstrap process.
 389  * We reload them nevertheless, this function acts as a
 390  * 'CPU state barrier', nothing should get across.
 391  */
 392 #if defined(CONFIG_CHIP_VDEC2) || defined(CONFIG_CHIP_XNUX2)    \
 393         || defined(CONFIG_CHIP_M32700) || defined(CONFIG_CHIP_M32102) \
 394         || defined(CONFIG_CHIP_OPSP) || defined(CONFIG_CHIP_M32104)
 395 void __init cpu_init (void)
 396 {
 397         int cpu_id = smp_processor_id();
 398
 399         if (test_and_set_bit(cpu_id, &cpu_initialized)) {
 400                 printk(KERN_WARNING "CPU#%d already initialized!\n", cpu_id);
 401                 for ( ; ; )
 402                         local_irq_enable();
 403         }
 404         printk(KERN_INFO "Initializing CPU#%d\n", cpu_id);
 405
 406         /* Set up and load the per-CPU TSS and LDT */
 407         mmgrab(&init_mm);
 408         current->active_mm = &init_mm;
 409         if (current->mm)
 410                 BUG();
 411
 412         /* Force FPU initialization */
 413         current_thread_info()->status = 0;
 414         clear_used_math();
 415
 416 #ifdef CONFIG_MMU
 417         /* Set up MMU */
 418         init_mmu();
 419 #endif
 420
 421         /* Set up ICUIMASK */
 422         outl(0x00070000, M32R_ICU_IMASK_PORTL);         /* imask=111 */
 423 }
 424 #endif  /* defined(CONFIG_CHIP_VDEC2) ... */