arch/sh64/kernel/setup.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * arch/sh64/kernel/setup.c
   7  *
   8  * sh64 Arch Support
   9  *
  10  * This file handles the architecture-dependent parts of initialization
  11  *
  12  * Copyright (C) 2000, 2001  Paolo Alberelli
  13  * Copyright (C) 2003, 2004  Paul Mundt
  14  *
  15  * benedict.gaster@superh.com:   2nd May 2002
  16  *    Modified to use the empty_zero_page to pass command line arguments.
  17  *
  18  * benedict.gaster@superh.com:   3rd May 2002
  19  *    Added support for ramdisk, removing statically linked romfs at the same time.
  20  *
  21  * lethal@linux-sh.org:          15th May 2003
  22  *    Added generic procfs cpuinfo reporting. Make boards just export their name.
  23  *
  24  * lethal@linux-sh.org:          25th May 2003
  25  *    Added generic get_cpu_subtype() for subtype reporting from cpu_data->type.
  26  *
  27  */
  28 #include <linux/errno.h>
  29 #include <linux/rwsem.h>
  30 #include <linux/sched.h>
  31 #include <linux/kernel.h>
  32 #include <linux/mm.h>
  33 #include <linux/stddef.h>
  34 #include <linux/unistd.h>
  35 #include <linux/ptrace.h>
  36 #include <linux/slab.h>
  37 #include <linux/user.h>
  38 #include <linux/a.out.h>
  39 #include <linux/tty.h>
  40 #include <linux/ioport.h>
  41 #include <linux/delay.h>
  42 #include <linux/config.h>
  43 #include <linux/init.h>
  44 #include <linux/seq_file.h>
  45 #include <linux/blkdev.h>
  46 #include <linux/bootmem.h>
  47 #include <linux/console.h>
  48 #include <linux/root_dev.h>
  49 #include <linux/cpu.h>
  50 #include <linux/initrd.h>
  51 #include <asm/processor.h>
  52 #include <asm/page.h>
  53 #include <asm/pgtable.h>
  54 #include <asm/platform.h>
  55 #include <asm/uaccess.h>
  56 #include <asm/system.h>
  57 #include <asm/io.h>
  58 #include <asm/sections.h>
  59 #include <asm/setup.h>
  60 #include <asm/smp.h>
  61
  62 #ifdef CONFIG_VT
  63 #include <linux/console.h>
  64 #endif
  65
  66 struct screen_info screen_info;
  67
  68 #ifdef CONFIG_BLK_DEV_RAM
  69 extern int rd_doload;           /* 1 = load ramdisk, 0 = don't load */
  70 extern int rd_prompt;           /* 1 = prompt for ramdisk, 0 = don't prompt */
  71 extern int rd_image_start;      /* starting block # of image */
  72 #endif
  73
  74 extern int root_mountflags;
  75 extern char *get_system_type(void);
  76 extern void platform_setup(void);
  77 extern void platform_monitor(void);
  78 extern void platform_reserve(void);
  79 extern int sh64_cache_init(void);
  80 extern int sh64_tlb_init(void);
  81
  82 #define RAMDISK_IMAGE_START_MASK        0x07FF
  83 #define RAMDISK_PROMPT_FLAG             0x8000
  84 #define RAMDISK_LOAD_FLAG               0x4000
  85
  86 static char command_line[COMMAND_LINE_SIZE] = { 0, };
  87 unsigned long long memory_start = CONFIG_MEMORY_START;
  88 unsigned long long memory_end = CONFIG_MEMORY_START + (CONFIG_MEMORY_SIZE_IN_MB * 1024 * 1024);
  89
  90 struct sh_cpuinfo boot_cpu_data;
  91
  92 static inline void parse_mem_cmdline (char ** cmdline_p)
  93 {
  94         char c = ' ', *to = command_line, *from = COMMAND_LINE;
  95         int len = 0;
  96
  97         /* Save unparsed command line copy for /proc/cmdline */
  98         memcpy(saved_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
  99         saved_command_line[COMMAND_LINE_SIZE-1] = '\0';
 100
 101         for (;;) {
 102           /*
 103            * "mem=XXX[kKmM]" defines a size of memory.
 104            */
 105                 if (c == ' ' && !memcmp(from, "mem=", 4)) {
 106                       if (to != command_line)
 107                         to--;
 108                       {
 109                         unsigned long mem_size;
 110
 111                         mem_size = memparse(from+4, &from);
 112                         memory_end = memory_start + mem_size;
 113                       }
 114                 }
 115                 c = *(from++);
 116                 if (!c)
 117                   break;
 118                 if (COMMAND_LINE_SIZE <= ++len)
 119                   break;
 120                 *(to++) = c;
 121         }
 122         *to = '\0';
 123
 124         *cmdline_p = command_line;
 125 }
 126
 127 static void __init sh64_cpu_type_detect(void)
 128 {
 129         extern unsigned long long peek_real_address_q(unsigned long long addr);
 130         unsigned long long cir;
 131         /* Do peeks in real mode to avoid having to set up a mapping for the
 132            WPC registers.  On SH5-101 cut2, such a mapping would be exposed to
 133            an address translation erratum which would make it hard to set up
 134            correctly. */
 135         cir = peek_real_address_q(0x0d000008);
 136
 137         if ((cir & 0xffff) == 0x5103) {
 138                 boot_cpu_data.type = CPU_SH5_103;
 139         } else if (((cir >> 32) & 0xffff) == 0x51e2) {
 140                 /* CPU.VCR aliased at CIR address on SH5-101 */
 141                 boot_cpu_data.type = CPU_SH5_101;
 142         } else {
 143                 boot_cpu_data.type = CPU_SH_NONE;
 144         }
 145 }
 146
 147 void __init setup_arch(char **cmdline_p)
 148 {
 149         unsigned long bootmap_size, i;
 150         unsigned long first_pfn, start_pfn, last_pfn, pages;
 151
 152 #ifdef CONFIG_EARLY_PRINTK
 153         extern void enable_early_printk(void);
 154
 155         /*
 156          * Setup Early SCIF console
 157          */
 158         enable_early_printk();
 159 #endif
 160
 161         /*
 162          * Setup TLB mappings
 163          */
 164         sh64_tlb_init();
 165
 166         /*
 167          * Caches are already initialized by the time we get here, so we just
 168          * fill in cpu_data info for the caches.
 169          */
 170         sh64_cache_init();
 171
 172         platform_setup();
 173         platform_monitor();
 174
 175         sh64_cpu_type_detect();
 176
 177         ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
 178
 179 #ifdef CONFIG_BLK_DEV_RAM
 180         rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
 181         rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
 182         rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
 183 #endif
 184
 185         if (!MOUNT_ROOT_RDONLY)
 186                 root_mountflags &= ~MS_RDONLY;
 187         init_mm.start_code = (unsigned long) _text;
 188         init_mm.end_code = (unsigned long) _etext;
 189         init_mm.end_data = (unsigned long) _edata;
 190         init_mm.brk = (unsigned long) _end;
 191
 192         code_resource.start = __pa(_text);
 193         code_resource.end = __pa(_etext)-1;
 194         data_resource.start = __pa(_etext);
 195         data_resource.end = __pa(_edata)-1;
 196
 197         parse_mem_cmdline(cmdline_p);
 198
 199         /*
 200          * Find the lowest and highest page frame numbers we have available
 201          */
 202         first_pfn = PFN_DOWN(memory_start);
 203         last_pfn = PFN_DOWN(memory_end);
 204         pages = last_pfn - first_pfn;
 205
 206         /*
 207          * Partially used pages are not usable - thus
 208          * we are rounding upwards:
 209          */
 210         start_pfn = PFN_UP(__pa(_end));
 211
 212         /*
 213          * Find a proper area for the bootmem bitmap. After this
 214          * bootstrap step all allocations (until the page allocator
 215          * is intact) must be done via bootmem_alloc().
 216          */
 217         bootmap_size = init_bootmem_node(NODE_DATA(0), start_pfn,
 218                                          first_pfn,
 219                                          last_pfn);
 220         /*
 221          * Round it up.
 222          */
 223         bootmap_size = PFN_PHYS(PFN_UP(bootmap_size));
 224
 225         /*
 226          * Register fully available RAM pages with the bootmem allocator.
 227          */
 228         free_bootmem_node(NODE_DATA(0), PFN_PHYS(first_pfn), PFN_PHYS(pages));
 229
 230         /*
 231          * Reserve all kernel sections + bootmem bitmap + a guard page.
 232          */
 233         reserve_bootmem_node(NODE_DATA(0), PFN_PHYS(first_pfn),
 234                         (PFN_PHYS(start_pfn) + bootmap_size + PAGE_SIZE) - PFN_PHYS(first_pfn));
 235
 236         /*
 237          * Reserve platform dependent sections
 238          */
 239         platform_reserve();
 240
 241 #ifdef CONFIG_BLK_DEV_INITRD
 242         if (LOADER_TYPE && INITRD_START) {
 243                 if (INITRD_START + INITRD_SIZE <= (PFN_PHYS(last_pfn))) {
 244                         reserve_bootmem_node(NODE_DATA(0), INITRD_START + __MEMORY_START, INITRD_SIZE);
 245
 246                         initrd_start =
 247                           (long) INITRD_START ? INITRD_START + PAGE_OFFSET +  __MEMORY_START : 0;
 248
 249                         initrd_end = initrd_start + INITRD_SIZE;
 250                 } else {
 251                         printk("initrd extends beyond end of memory "
 252                             "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 253                                     (long) INITRD_START + INITRD_SIZE,
 254                                     PFN_PHYS(last_pfn));
 255                         initrd_start = 0;
 256                 }
 257         }
 258 #endif
 259
 260         /*
 261          * Claim all RAM, ROM, and I/O resources.
 262          */
 263
 264         /* Kernel RAM */
 265         request_resource(&iomem_resource, &code_resource);
 266         request_resource(&iomem_resource, &data_resource);
 267
 268         /* Other KRAM space */
 269         for (i = 0; i < STANDARD_KRAM_RESOURCES - 2; i++)
 270                 request_resource(&iomem_resource,
 271                                  &platform_parms.kram_res_p[i]);
 272
 273         /* XRAM space */
 274         for (i = 0; i < STANDARD_XRAM_RESOURCES; i++)
 275                 request_resource(&iomem_resource,
 276                                  &platform_parms.xram_res_p[i]);
 277
 278         /* ROM space */
 279         for (i = 0; i < STANDARD_ROM_RESOURCES; i++)
 280                 request_resource(&iomem_resource,
 281                                  &platform_parms.rom_res_p[i]);
 282
 283         /* I/O space */
 284         for (i = 0; i < STANDARD_IO_RESOURCES; i++)
 285                 request_resource(&ioport_resource,
 286                                  &platform_parms.io_res_p[i]);
 287
 288
 289 #ifdef CONFIG_VT
 290 #if defined(CONFIG_VGA_CONSOLE)
 291         conswitchp = &vga_con;
 292 #elif defined(CONFIG_DUMMY_CONSOLE)
 293         conswitchp = &dummy_con;
 294 #endif
 295 #endif
 296
 297         printk("Hardware FPU: %s\n", fpu_in_use ? "enabled" : "disabled");
 298
 299         paging_init();
 300 }
 301
 302 void __xchg_called_with_bad_pointer(void)
 303 {
 304         printk(KERN_EMERG "xchg() called with bad pointer !\n");
 305 }
 306
 307 static struct cpu cpu[1];
 308
 309 static int __init topology_init(void)
 310 {
 311         return register_cpu(cpu, 0, NULL);
 312 }
 313
 314 subsys_initcall(topology_init);
 315
 316 /*
 317  *      Get CPU information
 318  */
 319 static const char *cpu_name[] = {
 320         [CPU_SH5_101]   = "SH5-101",
 321         [CPU_SH5_103]   = "SH5-103",
 322         [CPU_SH_NONE]   = "Unknown",
 323 };
 324
 325 const char *get_cpu_subtype(void)
 326 {
 327         return cpu_name[boot_cpu_data.type];
 328 }
 329
 330 #ifdef CONFIG_PROC_FS
 331 static int show_cpuinfo(struct seq_file *m,void *v)
 332 {
 333         unsigned int cpu = smp_processor_id();
 334
 335         if (!cpu)
 336                 seq_printf(m, "machine\t\t: %s\n", get_system_type());
 337
 338         seq_printf(m, "processor\t: %d\n", cpu);
 339         seq_printf(m, "cpu family\t: SH-5\n");
 340         seq_printf(m, "cpu type\t: %s\n", get_cpu_subtype());
 341
 342         seq_printf(m, "icache size\t: %dK-bytes\n",
 343                    (boot_cpu_data.icache.ways *
 344                     boot_cpu_data.icache.sets *
 345                     boot_cpu_data.icache.linesz) >> 10);
 346         seq_printf(m, "dcache size\t: %dK-bytes\n",
 347                    (boot_cpu_data.dcache.ways *
 348                     boot_cpu_data.dcache.sets *
 349                     boot_cpu_data.dcache.linesz) >> 10);
 350         seq_printf(m, "itlb entries\t: %d\n", boot_cpu_data.itlb.entries);
 351         seq_printf(m, "dtlb entries\t: %d\n", boot_cpu_data.dtlb.entries);
 352
 353 #define PRINT_CLOCK(name, value) \
 354         seq_printf(m, name " clock\t: %d.%02dMHz\n", \
 355                      ((value) / 1000000), ((value) % 1000000)/10000)
 356
 357         PRINT_CLOCK("cpu", boot_cpu_data.cpu_clock);
 358         PRINT_CLOCK("bus", boot_cpu_data.bus_clock);
 359         PRINT_CLOCK("module", boot_cpu_data.module_clock);
 360
 361         seq_printf(m, "bogomips\t: %lu.%02lu\n\n",
 362                      (loops_per_jiffy*HZ+2500)/500000,
 363                      ((loops_per_jiffy*HZ+2500)/5000) % 100);
 364
 365         return 0;
 366 }
 367
 368 static void *c_start(struct seq_file *m, loff_t *pos)
 369 {
 370         return (void*)(*pos == 0);
 371 }
 372 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 373 {
 374         return NULL;
 375 }
 376 static void c_stop(struct seq_file *m, void *v)
 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 */