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 #include <asm/serial.h>
  43 #include <asm/udbg.h>
  44
  45 #include "setup.h"
  46
  47 #define DBG(fmt...)
  48
  49 #if defined CONFIG_KGDB
  50 #include <asm/kgdb.h>
  51 #endif
  52
  53 extern void platform_init(void);
  54 extern void bootx_init(unsigned long r4, unsigned long phys);
  55
  56 extern void ppc6xx_idle(void);
  57 extern void power4_idle(void);
  58
  59 boot_infos_t *boot_infos;
  60 struct ide_machdep_calls ppc_ide_md;
  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 extern void prep_init(void);
  74 extern void pmac_init(void);
  75 extern void chrp_init(void);
  76
  77 dev_t boot_dev;
  78 #endif /* CONFIG_PPC_MULTIPLATFORM */
  79
  80 #ifdef CONFIG_MAGIC_SYSRQ
  81 unsigned long SYSRQ_KEY = 0x54;
  82 #endif /* CONFIG_MAGIC_SYSRQ */
  83
  84 #ifdef CONFIG_VGA_CONSOLE
  85 unsigned long vgacon_remap_base;
  86 #endif
  87
  88 struct machdep_calls ppc_md;
  89 EXPORT_SYMBOL(ppc_md);
  90
  91 /*
  92  * These are used in binfmt_elf.c to put aux entries on the stack
  93  * for each elf executable being started.
  94  */
  95 int dcache_bsize;
  96 int icache_bsize;
  97 int ucache_bsize;
  98
  99 /*
 100  * We're called here very early in the boot.  We determine the machine
 101  * type and call the appropriate low-level setup functions.
 102  *  -- Cort <cort@fsmlabs.com>
 103  *
 104  * Note that the kernel may be running at an address which is different
 105  * from the address that it was linked at, so we must use RELOC/PTRRELOC
 106  * to access static data (including strings).  -- paulus
 107  */
 108 unsigned long __init early_init(unsigned long dt_ptr)
 109 {
 110         unsigned long offset = reloc_offset();
 111
 112         /* First zero the BSS -- use memset_io, some platforms don't have
 113          * caches on yet */
 114         memset_io((void __iomem *)PTRRELOC(&__bss_start), 0, _end - __bss_start);
 115
 116         /*
 117          * Identify the CPU type and fix up code sections
 118          * that depend on which cpu we have.
 119          */
 120         identify_cpu(offset, 0);
 121         do_cpu_ftr_fixups(offset);
 122
 123         return KERNELBASE + offset;
 124 }
 125
 126 #ifdef CONFIG_PPC_MULTIPLATFORM
 127 /*
 128  * The PPC_MULTIPLATFORM version of platform_init...
 129  */
 130 void __init platform_init(void)
 131 {
 132         /* if we didn't get any bootinfo telling us what we are... */
 133         if (_machine == 0) {
 134                 /* prep boot loader tells us if we're prep or not */
 135                 if ( *(unsigned long *)(KERNELBASE) == (0xdeadc0de) )
 136                         _machine = _MACH_prep;
 137         }
 138
 139 #ifdef CONFIG_PPC_PREP
 140         /* not much more to do here, if prep */
 141         if (_machine == _MACH_prep) {
 142                 prep_init();
 143                 return;
 144         }
 145 #endif
 146
 147 #ifdef CONFIG_ADB
 148         if (strstr(cmd_line, "adb_sync")) {
 149                 extern int __adb_probe_sync;
 150                 __adb_probe_sync = 1;
 151         }
 152 #endif /* CONFIG_ADB */
 153
 154         switch (_machine) {
 155 #ifdef CONFIG_PPC_PMAC
 156         case _MACH_Pmac:
 157                 pmac_init();
 158                 break;
 159 #endif
 160 #ifdef CONFIG_PPC_CHRP
 161         case _MACH_chrp:
 162                 chrp_init();
 163                 break;
 164 #endif
 165         }
 166 }
 167 #endif
 168
 169 /*
 170  * Find out what kind of machine we're on and save any data we need
 171  * from the early boot process (devtree is copied on pmac by prom_init()).
 172  * This is called very early on the boot process, after a minimal
 173  * MMU environment has been set up but before MMU_init is called.
 174  */
 175 void __init machine_init(unsigned long dt_ptr, unsigned long phys)
 176 {
 177         /* If btext is enabled, we might have a BAT setup for early display,
 178          * thus we do enable some very basic udbg output
 179          */
 180 #ifdef CONFIG_BOOTX_TEXT
 181         udbg_putc = btext_drawchar;
 182 #endif
 183
 184         /* Do some early initialization based on the flat device tree */
 185         early_init_devtree(__va(dt_ptr));
 186
 187         /* Check default command line */
 188 #ifdef CONFIG_CMDLINE
 189         if (cmd_line[0] == 0)
 190                 strlcpy(cmd_line, CONFIG_CMDLINE, sizeof(cmd_line));
 191 #endif /* CONFIG_CMDLINE */
 192
 193         /* Base init based on machine type */
 194         platform_init();
 195
 196 #ifdef CONFIG_6xx
 197         ppc_md.power_save = ppc6xx_idle;
 198 #endif
 199
 200         if (ppc_md.progress)
 201                 ppc_md.progress("id mach(): done", 0x200);
 202 }
 203
 204 #ifdef CONFIG_BOOKE_WDT
 205 /* Checks wdt=x and wdt_period=xx command-line option */
 206 int __init early_parse_wdt(char *p)
 207 {
 208         if (p && strncmp(p, "0", 1) != 0)
 209                booke_wdt_enabled = 1;
 210
 211         return 0;
 212 }
 213 early_param("wdt", early_parse_wdt);
 214
 215 int __init early_parse_wdt_period (char *p)
 216 {
 217         if (p)
 218                 booke_wdt_period = simple_strtoul(p, NULL, 0);
 219
 220         return 0;
 221 }
 222 early_param("wdt_period", early_parse_wdt_period);
 223 #endif  /* CONFIG_BOOKE_WDT */
 224
 225 /* Checks "l2cr=xxxx" command-line option */
 226 int __init ppc_setup_l2cr(char *str)
 227 {
 228         if (cpu_has_feature(CPU_FTR_L2CR)) {
 229                 unsigned long val = simple_strtoul(str, NULL, 0);
 230                 printk(KERN_INFO "l2cr set to %lx\n", val);
 231                 _set_L2CR(0);           /* force invalidate by disable cache */
 232                 _set_L2CR(val);         /* and enable it */
 233         }
 234         return 1;
 235 }
 236 __setup("l2cr=", ppc_setup_l2cr);
 237
 238 #ifdef CONFIG_GENERIC_NVRAM
 239
 240 /* Generic nvram hooks used by drivers/char/gen_nvram.c */
 241 unsigned char nvram_read_byte(int addr)
 242 {
 243         if (ppc_md.nvram_read_val)
 244                 return ppc_md.nvram_read_val(addr);
 245         return 0xff;
 246 }
 247 EXPORT_SYMBOL(nvram_read_byte);
 248
 249 void nvram_write_byte(unsigned char val, int addr)
 250 {
 251         if (ppc_md.nvram_write_val)
 252                 ppc_md.nvram_write_val(addr, val);
 253 }
 254 EXPORT_SYMBOL(nvram_write_byte);
 255
 256 void nvram_sync(void)
 257 {
 258         if (ppc_md.nvram_sync)
 259                 ppc_md.nvram_sync();
 260 }
 261 EXPORT_SYMBOL(nvram_sync);
 262
 263 #endif /* CONFIG_NVRAM */
 264
 265 static struct cpu cpu_devices[NR_CPUS];
 266
 267 int __init ppc_init(void)
 268 {
 269         int i;
 270
 271         /* clear the progress line */
 272         if ( ppc_md.progress ) ppc_md.progress("             ", 0xffff);
 273
 274         /* register CPU devices */
 275         for_each_cpu(i)
 276                 register_cpu(&cpu_devices[i], i, NULL);
 277
 278         /* call platform init */
 279         if (ppc_md.init != NULL) {
 280                 ppc_md.init();
 281         }
 282         return 0;
 283 }
 284
 285 arch_initcall(ppc_init);
 286
 287 /* Warning, IO base is not yet inited */
 288 void __init setup_arch(char **cmdline_p)
 289 {
 290         extern void do_init_bootmem(void);
 291
 292         /* so udelay does something sensible, assume <= 1000 bogomips */
 293         loops_per_jiffy = 500000000 / HZ;
 294
 295         unflatten_device_tree();
 296         check_for_initrd();
 297
 298         if (ppc_md.init_early)
 299                 ppc_md.init_early();
 300
 301         find_legacy_serial_ports();
 302         finish_device_tree();
 303
 304         smp_setup_cpu_maps();
 305
 306 #ifdef CONFIG_XMON_DEFAULT
 307         xmon_init(1);
 308 #endif
 309         /* Register early console */
 310         register_early_udbg_console();
 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 = 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 }