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 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_FB_VGA16) || \
  98     defined(CONFIG_FB_VGA16_MODULE) || defined(CONFIG_FB_VESA)
  99 struct screen_info screen_info = {
 100         0, 25,                  /* orig-x, orig-y */
 101         0,                      /* unused */
 102         0,                      /* orig-video-page */
 103         0,                      /* orig-video-mode */
 104         80,                     /* orig-video-cols */
 105         0,0,0,                  /* ega_ax, ega_bx, ega_cx */
 106         25,                     /* orig-video-lines */
 107         1,                      /* orig-video-isVGA */
 108         16                      /* orig-video-points */
 109 };
 110 #endif /* CONFIG_VGA_CONSOLE || CONFIG_FB_VGA16 || CONFIG_FB_VESA */
 111
 112 /*
 113  * We're called here very early in the boot.  We determine the machine
 114  * type and call the appropriate low-level setup functions.
 115  *  -- Cort <cort@fsmlabs.com>
 116  *
 117  * Note that the kernel may be running at an address which is different
 118  * from the address that it was linked at, so we must use RELOC/PTRRELOC
 119  * to access static data (including strings).  -- paulus
 120  */
 121 unsigned long __init early_init(unsigned long dt_ptr)
 122 {
 123         unsigned long offset = reloc_offset();
 124
 125         /* First zero the BSS -- use memset_io, some platforms don't have
 126          * caches on yet */
 127         memset_io(PTRRELOC(&__bss_start), 0, _end - __bss_start);
 128
 129         /*
 130          * Identify the CPU type and fix up code sections
 131          * that depend on which cpu we have.
 132          */
 133         identify_cpu(offset, 0);
 134         do_cpu_ftr_fixups(offset);
 135
 136         return KERNELBASE + offset;
 137 }
 138
 139 #ifdef CONFIG_PPC_MULTIPLATFORM
 140 /*
 141  * The PPC_MULTIPLATFORM version of platform_init...
 142  */
 143 void __init platform_init(void)
 144 {
 145         /* if we didn't get any bootinfo telling us what we are... */
 146         if (_machine == 0) {
 147                 /* prep boot loader tells us if we're prep or not */
 148                 if ( *(unsigned long *)(KERNELBASE) == (0xdeadc0de) )
 149                         _machine = _MACH_prep;
 150         }
 151
 152 #ifdef CONFIG_PPC_PREP
 153         /* not much more to do here, if prep */
 154         if (_machine == _MACH_prep) {
 155                 prep_init();
 156                 return;
 157         }
 158 #endif
 159
 160 #ifdef CONFIG_ADB
 161         if (strstr(cmd_line, "adb_sync")) {
 162                 extern int __adb_probe_sync;
 163                 __adb_probe_sync = 1;
 164         }
 165 #endif /* CONFIG_ADB */
 166
 167         switch (_machine) {
 168 #ifdef CONFIG_PPC_PMAC
 169         case _MACH_Pmac:
 170                 pmac_init();
 171                 break;
 172 #endif
 173 #ifdef CONFIG_PPC_CHRP
 174         case _MACH_chrp:
 175                 chrp_init();
 176                 break;
 177 #endif
 178         }
 179 }
 180 #endif
 181
 182 /*
 183  * Find out what kind of machine we're on and save any data we need
 184  * from the early boot process (devtree is copied on pmac by prom_init()).
 185  * This is called very early on the boot process, after a minimal
 186  * MMU environment has been set up but before MMU_init is called.
 187  */
 188 void __init machine_init(unsigned long dt_ptr, unsigned long phys)
 189 {
 190         early_init_devtree(__va(dt_ptr));
 191
 192 #ifdef CONFIG_CMDLINE
 193         strlcpy(cmd_line, CONFIG_CMDLINE, sizeof(cmd_line));
 194 #endif /* CONFIG_CMDLINE */
 195
 196         platform_init();
 197
 198 #ifdef CONFIG_6xx
 199         ppc_md.power_save = ppc6xx_idle;
 200 #endif
 201
 202         if (ppc_md.progress)
 203                 ppc_md.progress("id mach(): done", 0x200);
 204 }
 205
 206 #ifdef CONFIG_BOOKE_WDT
 207 /* Checks wdt=x and wdt_period=xx command-line option */
 208 int __init early_parse_wdt(char *p)
 209 {
 210         if (p && strncmp(p, "0", 1) != 0)
 211                booke_wdt_enabled = 1;
 212
 213         return 0;
 214 }
 215 early_param("wdt", early_parse_wdt);
 216
 217 int __init early_parse_wdt_period (char *p)
 218 {
 219         if (p)
 220                 booke_wdt_period = simple_strtoul(p, NULL, 0);
 221
 222         return 0;
 223 }
 224 early_param("wdt_period", early_parse_wdt_period);
 225 #endif  /* CONFIG_BOOKE_WDT */
 226
 227 /* Checks "l2cr=xxxx" command-line option */
 228 int __init ppc_setup_l2cr(char *str)
 229 {
 230         if (cpu_has_feature(CPU_FTR_L2CR)) {
 231                 unsigned long val = simple_strtoul(str, NULL, 0);
 232                 printk(KERN_INFO "l2cr set to %lx\n", val);
 233                 _set_L2CR(0);           /* force invalidate by disable cache */
 234                 _set_L2CR(val);         /* and enable it */
 235         }
 236         return 1;
 237 }
 238 __setup("l2cr=", ppc_setup_l2cr);
 239
 240 #ifdef CONFIG_GENERIC_NVRAM
 241
 242 /* Generic nvram hooks used by drivers/char/gen_nvram.c */
 243 unsigned char nvram_read_byte(int addr)
 244 {
 245         if (ppc_md.nvram_read_val)
 246                 return ppc_md.nvram_read_val(addr);
 247         return 0xff;
 248 }
 249 EXPORT_SYMBOL(nvram_read_byte);
 250
 251 void nvram_write_byte(unsigned char val, int addr)
 252 {
 253         if (ppc_md.nvram_write_val)
 254                 ppc_md.nvram_write_val(addr, val);
 255 }
 256 EXPORT_SYMBOL(nvram_write_byte);
 257
 258 void nvram_sync(void)
 259 {
 260         if (ppc_md.nvram_sync)
 261                 ppc_md.nvram_sync();
 262 }
 263 EXPORT_SYMBOL(nvram_sync);
 264
 265 #endif /* CONFIG_NVRAM */
 266
 267 static struct cpu cpu_devices[NR_CPUS];
 268
 269 int __init ppc_init(void)
 270 {
 271         int i;
 272
 273         /* clear the progress line */
 274         if ( ppc_md.progress ) ppc_md.progress("             ", 0xffff);
 275
 276         /* register CPU devices */
 277         for (i = 0; i < NR_CPUS; i++)
 278                 if (cpu_possible(i))
 279                         register_cpu(&cpu_devices[i], i, NULL);
 280
 281         /* call platform init */
 282         if (ppc_md.init != NULL) {
 283                 ppc_md.init();
 284         }
 285         return 0;
 286 }
 287
 288 arch_initcall(ppc_init);
 289
 290 /* Warning, IO base is not yet inited */
 291 void __init setup_arch(char **cmdline_p)
 292 {
 293         extern char *klimit;
 294         extern void do_init_bootmem(void);
 295
 296         /* so udelay does something sensible, assume <= 1000 bogomips */
 297         loops_per_jiffy = 500000000 / HZ;
 298
 299         unflatten_device_tree();
 300         finish_device_tree();
 301
 302 #ifdef CONFIG_BOOTX_TEXT
 303         init_boot_display();
 304 #endif
 305
 306 #ifdef CONFIG_PPC_PMAC
 307         /* This could be called "early setup arch", it must be done
 308          * now because xmon need it
 309          */
 310         if (_machine == _MACH_Pmac)
 311                 pmac_feature_init();    /* New cool way */
 312 #endif
 313
 314 #ifdef CONFIG_XMON
 315         xmon_map_scc();
 316         if (strstr(cmd_line, "xmon"))
 317                 xmon(NULL);
 318 #endif /* CONFIG_XMON */
 319         if ( ppc_md.progress ) ppc_md.progress("setup_arch: enter", 0x3eab);
 320
 321 #if defined(CONFIG_KGDB)
 322         if (ppc_md.kgdb_map_scc)
 323                 ppc_md.kgdb_map_scc();
 324         set_debug_traps();
 325         if (strstr(cmd_line, "gdb")) {
 326                 if (ppc_md.progress)
 327                         ppc_md.progress("setup_arch: kgdb breakpoint", 0x4000);
 328                 printk("kgdb breakpoint activated\n");
 329                 breakpoint();
 330         }
 331 #endif
 332
 333         /*
 334          * Set cache line size based on type of cpu as a default.
 335          * Systems with OF can look in the properties on the cpu node(s)
 336          * for a possibly more accurate value.
 337          */
 338         if (cpu_has_feature(CPU_FTR_SPLIT_ID_CACHE)) {
 339                 dcache_bsize = cur_cpu_spec->dcache_bsize;
 340                 icache_bsize = cur_cpu_spec->icache_bsize;
 341                 ucache_bsize = 0;
 342         } else
 343                 ucache_bsize = dcache_bsize = icache_bsize
 344                         = cur_cpu_spec->dcache_bsize;
 345
 346         /* reboot on panic */
 347         panic_timeout = 180;
 348
 349         init_mm.start_code = PAGE_OFFSET;
 350         init_mm.end_code = (unsigned long) _etext;
 351         init_mm.end_data = (unsigned long) _edata;
 352         init_mm.brk = (unsigned long) klimit;
 353
 354         /* Save unparsed command line copy for /proc/cmdline */
 355         strlcpy(saved_command_line, cmd_line, COMMAND_LINE_SIZE);
 356         *cmdline_p = cmd_line;
 357
 358         parse_early_param();
 359
 360         /* set up the bootmem stuff with available memory */
 361         do_init_bootmem();
 362         if ( ppc_md.progress ) ppc_md.progress("setup_arch: bootmem", 0x3eab);
 363
 364 #ifdef CONFIG_PPC_OCP
 365         /* Initialize OCP device list */
 366         ocp_early_init();
 367         if ( ppc_md.progress ) ppc_md.progress("ocp: exit", 0x3eab);
 368 #endif
 369
 370 #ifdef CONFIG_DUMMY_CONSOLE
 371         conswitchp = &dummy_con;
 372 #endif
 373
 374         ppc_md.setup_arch();
 375         if ( ppc_md.progress ) ppc_md.progress("arch: exit", 0x3eab);
 376
 377         paging_init();
 378
 379         /* this is for modules since _machine can be a define -- Cort */
 380         ppc_md.ppc_machine = _machine;
 381 }