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