arch/powerpc/kernel/setup_32.c

   1 /*
   2  * Common prep/pmac/chrp boot and setup code.
   3  */
   4
   5 #include <linux/config.h>
   6 #include <linux/module.h>
   7 #include <linux/string.h>
   8 #include <linux/sched.h>
   9 #include <linux/init.h>
  10 #include <linux/kernel.h>
  11 #include <linux/reboot.h>
  12 #include <linux/delay.h>
  13 #include <linux/initrd.h>
  14 #include <linux/ide.h>
  15 #include <linux/tty.h>
  16 #include <linux/bootmem.h>
  17 #include <linux/seq_file.h>
  18 #include <linux/root_dev.h>
  19 #include <linux/cpu.h>
  20 #include <linux/console.h>
  21
  22 #include <asm/residual.h>
  23 #include <asm/io.h>
  24 #include <asm/prom.h>
  25 #include <asm/processor.h>
  26 #include <asm/pgtable.h>
  27 #include <asm/setup.h>
  28 #include <asm/amigappc.h>
  29 #include <asm/smp.h>
  30 #include <asm/elf.h>
  31 #include <asm/cputable.h>
  32 #include <asm/bootx.h>
  33 #include <asm/btext.h>
  34 #include <asm/machdep.h>
  35 #include <asm/uaccess.h>
  36 #include <asm/system.h>
  37 #include <asm/pmac_feature.h>
  38 #include <asm/sections.h>
  39 #include <asm/nvram.h>
  40 #include <asm/xmon.h>
  41 #include <asm/time.h>
  42
  43 #define DBG(fmt...)
  44
  45 #if defined CONFIG_KGDB
  46 #include <asm/kgdb.h>
  47 #endif
  48
  49 extern void platform_init(void);
  50 extern void bootx_init(unsigned long r4, unsigned long phys);
  51
  52 extern void ppc6xx_idle(void);
  53 extern void power4_idle(void);
  54
  55 boot_infos_t *boot_infos;
  56 struct ide_machdep_calls ppc_ide_md;
  57
  58 /* XXX should go elsewhere */
  59 int __irq_offset_value;
  60 EXPORT_SYMBOL(__irq_offset_value);
  61
  62 unsigned long ISA_DMA_THRESHOLD;
  63 unsigned int DMA_MODE_READ;
  64 unsigned int DMA_MODE_WRITE;
  65
  66 int have_of = 1;
  67
  68 #ifdef CONFIG_PPC_MULTIPLATFORM
  69 int _machine = 0;
  70
  71 extern void prep_init(void);
  72 extern void pmac_init(void);
  73 extern void chrp_init(void);
  74
  75 dev_t boot_dev;
  76 #endif /* CONFIG_PPC_MULTIPLATFORM */
  77
  78 #ifdef CONFIG_MAGIC_SYSRQ
  79 unsigned long SYSRQ_KEY = 0x54;
  80 #endif /* CONFIG_MAGIC_SYSRQ */
  81
  82 #ifdef CONFIG_VGA_CONSOLE
  83 unsigned long vgacon_remap_base;
  84 #endif
  85
  86 struct machdep_calls ppc_md;
  87 EXPORT_SYMBOL(ppc_md);
  88
  89 /*
  90  * These are used in binfmt_elf.c to put aux entries on the stack
  91  * for each elf executable being started.
  92  */
  93 int dcache_bsize;
  94 int icache_bsize;
  95 int ucache_bsize;
  96
  97 /*
  98  * We're called here very early in the boot.  We determine the machine
  99  * type and call the appropriate low-level setup functions.
 100  *  -- Cort <cort@fsmlabs.com>
 101  *
 102  * Note that the kernel may be running at an address which is different
 103  * from the address that it was linked at, so we must use RELOC/PTRRELOC
 104  * to access static data (including strings).  -- paulus
 105  */
 106 unsigned long __init early_init(unsigned long dt_ptr)
 107 {
 108         unsigned long offset = reloc_offset();
 109
 110         /* First zero the BSS -- use memset_io, some platforms don't have
 111          * caches on yet */
 112         memset_io(PTRRELOC(&__bss_start), 0, _end - __bss_start);
 113
 114         /*
 115          * Identify the CPU type and fix up code sections
 116          * that depend on which cpu we have.
 117          */
 118         identify_cpu(offset, 0);
 119         do_cpu_ftr_fixups(offset);
 120
 121         return KERNELBASE + offset;
 122 }
 123
 124 #ifdef CONFIG_PPC_MULTIPLATFORM
 125 /*
 126  * The PPC_MULTIPLATFORM version of platform_init...
 127  */
 128 void __init platform_init(void)
 129 {
 130         /* if we didn't get any bootinfo telling us what we are... */
 131         if (_machine == 0) {
 132                 /* prep boot loader tells us if we're prep or not */
 133                 if ( *(unsigned long *)(KERNELBASE) == (0xdeadc0de) )
 134                         _machine = _MACH_prep;
 135         }
 136
 137 #ifdef CONFIG_PPC_PREP
 138         /* not much more to do here, if prep */
 139         if (_machine == _MACH_prep) {
 140                 prep_init();
 141                 return;
 142         }
 143 #endif
 144
 145 #ifdef CONFIG_ADB
 146         if (strstr(cmd_line, "adb_sync")) {
 147                 extern int __adb_probe_sync;
 148                 __adb_probe_sync = 1;
 149         }
 150 #endif /* CONFIG_ADB */
 151
 152         switch (_machine) {
 153 #ifdef CONFIG_PPC_PMAC
 154         case _MACH_Pmac:
 155                 pmac_init();
 156                 break;
 157 #endif
 158 #ifdef CONFIG_PPC_CHRP
 159         case _MACH_chrp:
 160                 chrp_init();
 161                 break;
 162 #endif
 163         }
 164 }
 165 #endif
 166
 167 /*
 168  * Find out what kind of machine we're on and save any data we need
 169  * from the early boot process (devtree is copied on pmac by prom_init()).
 170  * This is called very early on the boot process, after a minimal
 171  * MMU environment has been set up but before MMU_init is called.
 172  */
 173 void __init machine_init(unsigned long dt_ptr, unsigned long phys)
 174 {
 175         early_init_devtree(__va(dt_ptr));
 176
 177 #ifdef CONFIG_CMDLINE
 178         strlcpy(cmd_line, CONFIG_CMDLINE, sizeof(cmd_line));
 179 #endif /* CONFIG_CMDLINE */
 180
 181         platform_init();
 182
 183 #ifdef CONFIG_6xx
 184         ppc_md.power_save = ppc6xx_idle;
 185 #endif
 186
 187         if (ppc_md.progress)
 188                 ppc_md.progress("id mach(): done", 0x200);
 189 }
 190
 191 #ifdef CONFIG_BOOKE_WDT
 192 /* Checks wdt=x and wdt_period=xx command-line option */
 193 int __init early_parse_wdt(char *p)
 194 {
 195         if (p && strncmp(p, "0", 1) != 0)
 196                booke_wdt_enabled = 1;
 197
 198         return 0;
 199 }
 200 early_param("wdt", early_parse_wdt);
 201
 202 int __init early_parse_wdt_period (char *p)
 203 {
 204         if (p)
 205                 booke_wdt_period = simple_strtoul(p, NULL, 0);
 206
 207         return 0;
 208 }
 209 early_param("wdt_period", early_parse_wdt_period);
 210 #endif  /* CONFIG_BOOKE_WDT */
 211
 212 /* Checks "l2cr=xxxx" command-line option */
 213 int __init ppc_setup_l2cr(char *str)
 214 {
 215         if (cpu_has_feature(CPU_FTR_L2CR)) {
 216                 unsigned long val = simple_strtoul(str, NULL, 0);
 217                 printk(KERN_INFO "l2cr set to %lx\n", val);
 218                 _set_L2CR(0);           /* force invalidate by disable cache */
 219                 _set_L2CR(val);         /* and enable it */
 220         }
 221         return 1;
 222 }
 223 __setup("l2cr=", ppc_setup_l2cr);
 224
 225 #ifdef CONFIG_GENERIC_NVRAM
 226
 227 /* Generic nvram hooks used by drivers/char/gen_nvram.c */
 228 unsigned char nvram_read_byte(int addr)
 229 {
 230         if (ppc_md.nvram_read_val)
 231                 return ppc_md.nvram_read_val(addr);
 232         return 0xff;
 233 }
 234 EXPORT_SYMBOL(nvram_read_byte);
 235
 236 void nvram_write_byte(unsigned char val, int addr)
 237 {
 238         if (ppc_md.nvram_write_val)
 239                 ppc_md.nvram_write_val(addr, val);
 240 }
 241 EXPORT_SYMBOL(nvram_write_byte);
 242
 243 void nvram_sync(void)
 244 {
 245         if (ppc_md.nvram_sync)
 246                 ppc_md.nvram_sync();
 247 }
 248 EXPORT_SYMBOL(nvram_sync);
 249
 250 #endif /* CONFIG_NVRAM */
 251
 252 static struct cpu cpu_devices[NR_CPUS];
 253
 254 int __init ppc_init(void)
 255 {
 256         int i;
 257
 258         /* clear the progress line */
 259         if ( ppc_md.progress ) ppc_md.progress("             ", 0xffff);
 260
 261         /* register CPU devices */
 262         for (i = 0; i < NR_CPUS; i++)
 263                 if (cpu_possible(i))
 264                         register_cpu(&cpu_devices[i], i, NULL);
 265
 266         /* call platform init */
 267         if (ppc_md.init != NULL) {
 268                 ppc_md.init();
 269         }
 270         return 0;
 271 }
 272
 273 arch_initcall(ppc_init);
 274
 275 /* Warning, IO base is not yet inited */
 276 void __init setup_arch(char **cmdline_p)
 277 {
 278         extern char *klimit;
 279         extern void do_init_bootmem(void);
 280
 281         /* so udelay does something sensible, assume <= 1000 bogomips */
 282         loops_per_jiffy = 500000000 / HZ;
 283
 284         unflatten_device_tree();
 285         finish_device_tree();
 286
 287 #ifdef CONFIG_BOOTX_TEXT
 288         init_boot_display();
 289 #endif
 290
 291 #ifdef CONFIG_PPC_PMAC
 292         /* This could be called "early setup arch", it must be done
 293          * now because xmon need it
 294          */
 295         if (_machine == _MACH_Pmac)
 296                 pmac_feature_init();    /* New cool way */
 297 #endif
 298
 299 #ifdef CONFIG_XMON
 300         xmon_map_scc();
 301         if (strstr(cmd_line, "xmon"))
 302                 xmon(NULL);
 303 #endif /* CONFIG_XMON */
 304         if ( ppc_md.progress ) ppc_md.progress("setup_arch: enter", 0x3eab);
 305
 306 #if defined(CONFIG_KGDB)
 307         if (ppc_md.kgdb_map_scc)
 308                 ppc_md.kgdb_map_scc();
 309         set_debug_traps();
 310         if (strstr(cmd_line, "gdb")) {
 311                 if (ppc_md.progress)
 312                         ppc_md.progress("setup_arch: kgdb breakpoint", 0x4000);
 313                 printk("kgdb breakpoint activated\n");
 314                 breakpoint();
 315         }
 316 #endif
 317
 318         /*
 319          * Set cache line size based on type of cpu as a default.
 320          * Systems with OF can look in the properties on the cpu node(s)
 321          * for a possibly more accurate value.
 322          */
 323         if (cpu_has_feature(CPU_FTR_SPLIT_ID_CACHE)) {
 324                 dcache_bsize = cur_cpu_spec->dcache_bsize;
 325                 icache_bsize = cur_cpu_spec->icache_bsize;
 326                 ucache_bsize = 0;
 327         } else
 328                 ucache_bsize = dcache_bsize = icache_bsize
 329                         = cur_cpu_spec->dcache_bsize;
 330
 331         /* reboot on panic */
 332         panic_timeout = 180;
 333
 334         init_mm.start_code = PAGE_OFFSET;
 335         init_mm.end_code = (unsigned long) _etext;
 336         init_mm.end_data = (unsigned long) _edata;
 337         init_mm.brk = (unsigned long) klimit;
 338
 339         /* Save unparsed command line copy for /proc/cmdline */
 340         strlcpy(saved_command_line, cmd_line, COMMAND_LINE_SIZE);
 341         *cmdline_p = cmd_line;
 342
 343         parse_early_param();
 344
 345         /* set up the bootmem stuff with available memory */
 346         do_init_bootmem();
 347         if ( ppc_md.progress ) ppc_md.progress("setup_arch: bootmem", 0x3eab);
 348
 349 #ifdef CONFIG_PPC_OCP
 350         /* Initialize OCP device list */
 351         ocp_early_init();
 352         if ( ppc_md.progress ) ppc_md.progress("ocp: exit", 0x3eab);
 353 #endif
 354
 355 #ifdef CONFIG_DUMMY_CONSOLE
 356         conswitchp = &dummy_con;
 357 #endif
 358
 359         ppc_md.setup_arch();
 360         if ( ppc_md.progress ) ppc_md.progress("arch: exit", 0x3eab);
 361
 362         paging_init();
 363
 364         /* this is for modules since _machine can be a define -- Cort */
 365         ppc_md.ppc_machine = _machine;
 366 }