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 int boot_cpuid;
  63 EXPORT_SYMBOL_GPL(boot_cpuid);
  64 int boot_cpuid_phys;
  65
  66 unsigned long ISA_DMA_THRESHOLD;
  67 unsigned int DMA_MODE_READ;
  68 unsigned int DMA_MODE_WRITE;
  69
  70 int have_of = 1;
  71
  72 #ifdef CONFIG_PPC_MULTIPLATFORM
  73 int _machine = 0;
  74
  75 extern void prep_init(void);
  76 extern void pmac_init(void);
  77 extern void chrp_init(void);
  78
  79 dev_t boot_dev;
  80 #endif /* CONFIG_PPC_MULTIPLATFORM */
  81
  82 #ifdef CONFIG_MAGIC_SYSRQ
  83 unsigned long SYSRQ_KEY = 0x54;
  84 #endif /* CONFIG_MAGIC_SYSRQ */
  85
  86 #ifdef CONFIG_VGA_CONSOLE
  87 unsigned long vgacon_remap_base;
  88 #endif
  89
  90 struct machdep_calls ppc_md;
  91 EXPORT_SYMBOL(ppc_md);
  92
  93 /*
  94  * These are used in binfmt_elf.c to put aux entries on the stack
  95  * for each elf executable being started.
  96  */
  97 int dcache_bsize;
  98 int icache_bsize;
  99 int ucache_bsize;
 100
 101 /*
 102  * We're called here very early in the boot.  We determine the machine
 103  * type and call the appropriate low-level setup functions.
 104  *  -- Cort <cort@fsmlabs.com>
 105  *
 106  * Note that the kernel may be running at an address which is different
 107  * from the address that it was linked at, so we must use RELOC/PTRRELOC
 108  * to access static data (including strings).  -- paulus
 109  */
 110 unsigned long __init early_init(unsigned long dt_ptr)
 111 {
 112         unsigned long offset = reloc_offset();
 113
 114         /* First zero the BSS -- use memset_io, some platforms don't have
 115          * caches on yet */
 116         memset_io(PTRRELOC(&__bss_start), 0, _end - __bss_start);
 117
 118         /*
 119          * Identify the CPU type and fix up code sections
 120          * that depend on which cpu we have.
 121          */
 122         identify_cpu(offset, 0);
 123         do_cpu_ftr_fixups(offset);
 124
 125         return KERNELBASE + offset;
 126 }
 127
 128 #ifdef CONFIG_PPC_MULTIPLATFORM
 129 /*
 130  * The PPC_MULTIPLATFORM version of platform_init...
 131  */
 132 void __init platform_init(void)
 133 {
 134         /* if we didn't get any bootinfo telling us what we are... */
 135         if (_machine == 0) {
 136                 /* prep boot loader tells us if we're prep or not */
 137                 if ( *(unsigned long *)(KERNELBASE) == (0xdeadc0de) )
 138                         _machine = _MACH_prep;
 139         }
 140
 141 #ifdef CONFIG_PPC_PREP
 142         /* not much more to do here, if prep */
 143         if (_machine == _MACH_prep) {
 144                 prep_init();
 145                 return;
 146         }
 147 #endif
 148
 149 #ifdef CONFIG_ADB
 150         if (strstr(cmd_line, "adb_sync")) {
 151                 extern int __adb_probe_sync;
 152                 __adb_probe_sync = 1;
 153         }
 154 #endif /* CONFIG_ADB */
 155
 156         switch (_machine) {
 157 #ifdef CONFIG_PPC_PMAC
 158         case _MACH_Pmac:
 159                 pmac_init();
 160                 break;
 161 #endif
 162 #ifdef CONFIG_PPC_CHRP
 163         case _MACH_chrp:
 164                 chrp_init();
 165                 break;
 166 #endif
 167         }
 168 }
 169 #endif
 170
 171 /*
 172  * Find out what kind of machine we're on and save any data we need
 173  * from the early boot process (devtree is copied on pmac by prom_init()).
 174  * This is called very early on the boot process, after a minimal
 175  * MMU environment has been set up but before MMU_init is called.
 176  */
 177 void __init machine_init(unsigned long dt_ptr, unsigned long phys)
 178 {
 179         early_init_devtree(__va(dt_ptr));
 180
 181 #ifdef CONFIG_CMDLINE
 182         strlcpy(cmd_line, CONFIG_CMDLINE, sizeof(cmd_line));
 183 #endif /* CONFIG_CMDLINE */
 184
 185         platform_init();
 186
 187 #ifdef CONFIG_6xx
 188         ppc_md.power_save = ppc6xx_idle;
 189 #endif
 190
 191         if (ppc_md.progress)
 192                 ppc_md.progress("id mach(): done", 0x200);
 193 }
 194
 195 #ifdef CONFIG_BOOKE_WDT
 196 /* Checks wdt=x and wdt_period=xx command-line option */
 197 int __init early_parse_wdt(char *p)
 198 {
 199         if (p && strncmp(p, "0", 1) != 0)
 200                booke_wdt_enabled = 1;
 201
 202         return 0;
 203 }
 204 early_param("wdt", early_parse_wdt);
 205
 206 int __init early_parse_wdt_period (char *p)
 207 {
 208         if (p)
 209                 booke_wdt_period = simple_strtoul(p, NULL, 0);
 210
 211         return 0;
 212 }
 213 early_param("wdt_period", early_parse_wdt_period);
 214 #endif  /* CONFIG_BOOKE_WDT */
 215
 216 /* Checks "l2cr=xxxx" command-line option */
 217 int __init ppc_setup_l2cr(char *str)
 218 {
 219         if (cpu_has_feature(CPU_FTR_L2CR)) {
 220                 unsigned long val = simple_strtoul(str, NULL, 0);
 221                 printk(KERN_INFO "l2cr set to %lx\n", val);
 222                 _set_L2CR(0);           /* force invalidate by disable cache */
 223                 _set_L2CR(val);         /* and enable it */
 224         }
 225         return 1;
 226 }
 227 __setup("l2cr=", ppc_setup_l2cr);
 228
 229 #ifdef CONFIG_GENERIC_NVRAM
 230
 231 /* Generic nvram hooks used by drivers/char/gen_nvram.c */
 232 unsigned char nvram_read_byte(int addr)
 233 {
 234         if (ppc_md.nvram_read_val)
 235                 return ppc_md.nvram_read_val(addr);
 236         return 0xff;
 237 }
 238 EXPORT_SYMBOL(nvram_read_byte);
 239
 240 void nvram_write_byte(unsigned char val, int addr)
 241 {
 242         if (ppc_md.nvram_write_val)
 243                 ppc_md.nvram_write_val(addr, val);
 244 }
 245 EXPORT_SYMBOL(nvram_write_byte);
 246
 247 void nvram_sync(void)
 248 {
 249         if (ppc_md.nvram_sync)
 250                 ppc_md.nvram_sync();
 251 }
 252 EXPORT_SYMBOL(nvram_sync);
 253
 254 #endif /* CONFIG_NVRAM */
 255
 256 static struct cpu cpu_devices[NR_CPUS];
 257
 258 int __init ppc_init(void)
 259 {
 260         int i;
 261
 262         /* clear the progress line */
 263         if ( ppc_md.progress ) ppc_md.progress("             ", 0xffff);
 264
 265         /* register CPU devices */
 266         for (i = 0; i < NR_CPUS; i++)
 267                 if (cpu_possible(i))
 268                         register_cpu(&cpu_devices[i], i, NULL);
 269
 270         /* call platform init */
 271         if (ppc_md.init != NULL) {
 272                 ppc_md.init();
 273         }
 274         return 0;
 275 }
 276
 277 arch_initcall(ppc_init);
 278
 279 /* Warning, IO base is not yet inited */
 280 void __init setup_arch(char **cmdline_p)
 281 {
 282         extern char *klimit;
 283         extern void do_init_bootmem(void);
 284
 285         /* so udelay does something sensible, assume <= 1000 bogomips */
 286         loops_per_jiffy = 500000000 / HZ;
 287
 288         unflatten_device_tree();
 289         finish_device_tree();
 290
 291 #ifdef CONFIG_BOOTX_TEXT
 292         init_boot_display();
 293 #endif
 294
 295 #ifdef CONFIG_PPC_PMAC
 296         /* This could be called "early setup arch", it must be done
 297          * now because xmon need it
 298          */
 299         if (_machine == _MACH_Pmac)
 300                 pmac_feature_init();    /* New cool way */
 301 #endif
 302
 303 #ifdef CONFIG_XMON
 304         xmon_map_scc();
 305         if (strstr(cmd_line, "xmon")) {
 306                 xmon_init(1);
 307                 debugger(NULL);
 308         }
 309 #endif /* CONFIG_XMON */
 310         if ( ppc_md.progress ) ppc_md.progress("setup_arch: enter", 0x3eab);
 311
 312 #if defined(CONFIG_KGDB)
 313         if (ppc_md.kgdb_map_scc)
 314                 ppc_md.kgdb_map_scc();
 315         set_debug_traps();
 316         if (strstr(cmd_line, "gdb")) {
 317                 if (ppc_md.progress)
 318                         ppc_md.progress("setup_arch: kgdb breakpoint", 0x4000);
 319                 printk("kgdb breakpoint activated\n");
 320                 breakpoint();
 321         }
 322 #endif
 323
 324         /*
 325          * Set cache line size based on type of cpu as a default.
 326          * Systems with OF can look in the properties on the cpu node(s)
 327          * for a possibly more accurate value.
 328          */
 329         if (cpu_has_feature(CPU_FTR_SPLIT_ID_CACHE)) {
 330                 dcache_bsize = cur_cpu_spec->dcache_bsize;
 331                 icache_bsize = cur_cpu_spec->icache_bsize;
 332                 ucache_bsize = 0;
 333         } else
 334                 ucache_bsize = dcache_bsize = icache_bsize
 335                         = cur_cpu_spec->dcache_bsize;
 336
 337         /* reboot on panic */
 338         panic_timeout = 180;
 339
 340         init_mm.start_code = PAGE_OFFSET;
 341         init_mm.end_code = (unsigned long) _etext;
 342         init_mm.end_data = (unsigned long) _edata;
 343         init_mm.brk = (unsigned long) klimit;
 344
 345         /* Save unparsed command line copy for /proc/cmdline */
 346         strlcpy(saved_command_line, cmd_line, COMMAND_LINE_SIZE);
 347         *cmdline_p = cmd_line;
 348
 349         parse_early_param();
 350
 351         /* set up the bootmem stuff with available memory */
 352         do_init_bootmem();
 353         if ( ppc_md.progress ) ppc_md.progress("setup_arch: bootmem", 0x3eab);
 354
 355 #ifdef CONFIG_PPC_OCP
 356         /* Initialize OCP device list */
 357         ocp_early_init();
 358         if ( ppc_md.progress ) ppc_md.progress("ocp: exit", 0x3eab);
 359 #endif
 360
 361 #ifdef CONFIG_DUMMY_CONSOLE
 362         conswitchp = &dummy_con;
 363 #endif
 364
 365         ppc_md.setup_arch();
 366         if ( ppc_md.progress ) ppc_md.progress("arch: exit", 0x3eab);
 367
 368         paging_init();
 369
 370         /* this is for modules since _machine can be a define -- Cort */
 371         ppc_md.ppc_machine = _machine;
 372 }