release/src-rt-6.x/linux/linux-2.6/arch/powerpc/kernel/setup_32.c

   1 /*
   2  * Common prep/pmac/chrp boot and setup code.
   3  */
   4
   5 #include <linux/module.h>
   6 #include <linux/string.h>
   7 #include <linux/sched.h>
   8 #include <linux/init.h>
   9 #include <linux/kernel.h>
  10 #include <linux/reboot.h>
  11 #include <linux/delay.h>
  12 #include <linux/initrd.h>
  13 #include <linux/ide.h>
  14 #include <linux/tty.h>
  15 #include <linux/bootmem.h>
  16 #include <linux/seq_file.h>
  17 #include <linux/root_dev.h>
  18 #include <linux/cpu.h>
  19 #include <linux/console.h>
  20
  21 #include <asm/residual.h>
  22 #include <asm/io.h>
  23 #include <asm/prom.h>
  24 #include <asm/processor.h>
  25 #include <asm/pgtable.h>
  26 #include <asm/setup.h>
  27 #include <asm/amigappc.h>
  28 #include <asm/smp.h>
  29 #include <asm/elf.h>
  30 #include <asm/cputable.h>
  31 #include <asm/bootx.h>
  32 #include <asm/btext.h>
  33 #include <asm/machdep.h>
  34 #include <asm/uaccess.h>
  35 #include <asm/system.h>
  36 #include <asm/pmac_feature.h>
  37 #include <asm/sections.h>
  38 #include <asm/nvram.h>
  39 #include <asm/xmon.h>
  40 #include <asm/time.h>
  41 #include <asm/serial.h>
  42 #include <asm/udbg.h>
  43
  44 #include "setup.h"
  45
  46 #define DBG(fmt...)
  47
  48 #if defined CONFIG_KGDB
  49 #include <asm/kgdb.h>
  50 #endif
  51
  52 extern void bootx_init(unsigned long r4, unsigned long phys);
  53
  54 struct ide_machdep_calls ppc_ide_md;
  55
  56 int boot_cpuid;
  57 EXPORT_SYMBOL_GPL(boot_cpuid);
  58 int boot_cpuid_phys;
  59
  60 unsigned long ISA_DMA_THRESHOLD;
  61 unsigned int DMA_MODE_READ;
  62 unsigned int DMA_MODE_WRITE;
  63
  64 int have_of = 1;
  65
  66 #ifdef CONFIG_VGA_CONSOLE
  67 unsigned long vgacon_remap_base;
  68 EXPORT_SYMBOL(vgacon_remap_base);
  69 #endif
  70
  71 /*
  72  * These are used in binfmt_elf.c to put aux entries on the stack
  73  * for each elf executable being started.
  74  */
  75 int dcache_bsize;
  76 int icache_bsize;
  77 int ucache_bsize;
  78
  79 /*
  80  * We're called here very early in the boot.  We determine the machine
  81  * type and call the appropriate low-level setup functions.
  82  *  -- Cort <cort@fsmlabs.com>
  83  *
  84  * Note that the kernel may be running at an address which is different
  85  * from the address that it was linked at, so we must use RELOC/PTRRELOC
  86  * to access static data (including strings).  -- paulus
  87  */
  88 unsigned long __init early_init(unsigned long dt_ptr)
  89 {
  90         unsigned long offset = reloc_offset();
  91         struct cpu_spec *spec;
  92
  93         /* First zero the BSS -- use memset_io, some platforms don't have
  94          * caches on yet */
  95         memset_io((void __iomem *)PTRRELOC(&__bss_start), 0,
  96                         __bss_stop - __bss_start);
  97
  98         /*
  99          * Identify the CPU type and fix up code sections
 100          * that depend on which cpu we have.
 101          */
 102         spec = identify_cpu(offset, mfspr(SPRN_PVR));
 103
 104         do_feature_fixups(spec->cpu_features,
 105                           PTRRELOC(&__start___ftr_fixup),
 106                           PTRRELOC(&__stop___ftr_fixup));
 107
 108         return KERNELBASE + offset;
 109 }
 110
 111
 112 /*
 113  * Find out what kind of machine we're on and save any data we need
 114  * from the early boot process (devtree is copied on pmac by prom_init()).
 115  * This is called very early on the boot process, after a minimal
 116  * MMU environment has been set up but before MMU_init is called.
 117  */
 118 void __init machine_init(unsigned long dt_ptr, unsigned long phys)
 119 {
 120         /* Enable early debugging if any specified (see udbg.h) */
 121         udbg_early_init();
 122
 123         /* Do some early initialization based on the flat device tree */
 124         early_init_devtree(__va(dt_ptr));
 125
 126         probe_machine();
 127
 128 #ifdef CONFIG_6xx
 129         if (cpu_has_feature(CPU_FTR_CAN_DOZE) ||
 130             cpu_has_feature(CPU_FTR_CAN_NAP))
 131                 ppc_md.power_save = ppc6xx_idle;
 132 #endif
 133
 134         if (ppc_md.progress)
 135                 ppc_md.progress("id mach(): done", 0x200);
 136 }
 137
 138 #ifdef CONFIG_BOOKE_WDT
 139 /* Checks wdt=x and wdt_period=xx command-line option */
 140 int __init early_parse_wdt(char *p)
 141 {
 142         if (p && strncmp(p, "0", 1) != 0)
 143                booke_wdt_enabled = 1;
 144
 145         return 0;
 146 }
 147 early_param("wdt", early_parse_wdt);
 148
 149 int __init early_parse_wdt_period (char *p)
 150 {
 151         if (p)
 152                 booke_wdt_period = simple_strtoul(p, NULL, 0);
 153
 154         return 0;
 155 }
 156 early_param("wdt_period", early_parse_wdt_period);
 157 #endif  /* CONFIG_BOOKE_WDT */
 158
 159 /* Checks "l2cr=xxxx" command-line option */
 160 int __init ppc_setup_l2cr(char *str)
 161 {
 162         if (cpu_has_feature(CPU_FTR_L2CR)) {
 163                 unsigned long val = simple_strtoul(str, NULL, 0);
 164                 printk(KERN_INFO "l2cr set to %lx\n", val);
 165                 _set_L2CR(0);           /* force invalidate by disable cache */
 166                 _set_L2CR(val);         /* and enable it */
 167         }
 168         return 1;
 169 }
 170 __setup("l2cr=", ppc_setup_l2cr);
 171
 172 #ifdef CONFIG_GENERIC_NVRAM
 173
 174 /* Generic nvram hooks used by drivers/char/gen_nvram.c */
 175 unsigned char nvram_read_byte(int addr)
 176 {
 177         if (ppc_md.nvram_read_val)
 178                 return ppc_md.nvram_read_val(addr);
 179         return 0xff;
 180 }
 181 EXPORT_SYMBOL(nvram_read_byte);
 182
 183 void nvram_write_byte(unsigned char val, int addr)
 184 {
 185         if (ppc_md.nvram_write_val)
 186                 ppc_md.nvram_write_val(addr, val);
 187 }
 188 EXPORT_SYMBOL(nvram_write_byte);
 189
 190 void nvram_sync(void)
 191 {
 192         if (ppc_md.nvram_sync)
 193                 ppc_md.nvram_sync();
 194 }
 195 EXPORT_SYMBOL(nvram_sync);
 196
 197 #endif /* CONFIG_NVRAM */
 198
 199 static DEFINE_PER_CPU(struct cpu, cpu_devices);
 200
 201 int __init ppc_init(void)
 202 {
 203         int cpu;
 204
 205         /* clear the progress line */
 206         if (ppc_md.progress)
 207                 ppc_md.progress("             ", 0xffff);
 208
 209         /* register CPU devices */
 210         for_each_possible_cpu(cpu) {
 211                 struct cpu *c = &per_cpu(cpu_devices, cpu);
 212                 c->hotpluggable = 1;
 213                 register_cpu(c, cpu);
 214         }
 215
 216         /* call platform init */
 217         if (ppc_md.init != NULL) {
 218                 ppc_md.init();
 219         }
 220         return 0;
 221 }
 222
 223 arch_initcall(ppc_init);
 224
 225 /* Warning, IO base is not yet inited */
 226 void __init setup_arch(char **cmdline_p)
 227 {
 228         *cmdline_p = cmd_line;
 229
 230         /* so udelay does something sensible, assume <= 1000 bogomips */
 231         loops_per_jiffy = 500000000 / HZ;
 232
 233         unflatten_device_tree();
 234         check_for_initrd();
 235
 236         if (ppc_md.init_early)
 237                 ppc_md.init_early();
 238
 239         find_legacy_serial_ports();
 240
 241         smp_setup_cpu_maps();
 242
 243         /* Register early console */
 244         register_early_udbg_console();
 245
 246         xmon_setup();
 247
 248 #if defined(CONFIG_KGDB)
 249         if (ppc_md.kgdb_map_scc)
 250                 ppc_md.kgdb_map_scc();
 251         set_debug_traps();
 252         if (strstr(cmd_line, "gdb")) {
 253                 if (ppc_md.progress)
 254                         ppc_md.progress("setup_arch: kgdb breakpoint", 0x4000);
 255                 printk("kgdb breakpoint activated\n");
 256                 breakpoint();
 257         }
 258 #endif
 259
 260         /*
 261          * Set cache line size based on type of cpu as a default.
 262          * Systems with OF can look in the properties on the cpu node(s)
 263          * for a possibly more accurate value.
 264          */
 265         if (cpu_has_feature(CPU_FTR_SPLIT_ID_CACHE)) {
 266                 dcache_bsize = cur_cpu_spec->dcache_bsize;
 267                 icache_bsize = cur_cpu_spec->icache_bsize;
 268                 ucache_bsize = 0;
 269         } else
 270                 ucache_bsize = dcache_bsize = icache_bsize
 271                         = cur_cpu_spec->dcache_bsize;
 272
 273         /* reboot on panic */
 274         panic_timeout = 180;
 275
 276         if (ppc_md.panic)
 277                 setup_panic();
 278
 279         init_mm.start_code = PAGE_OFFSET;
 280         init_mm.end_code = (unsigned long) _etext;
 281         init_mm.end_data = (unsigned long) _edata;
 282         init_mm.brk = klimit;
 283
 284         /* set up the bootmem stuff with available memory */
 285         do_init_bootmem();
 286         if ( ppc_md.progress ) ppc_md.progress("setup_arch: bootmem", 0x3eab);
 287
 288 #ifdef CONFIG_DUMMY_CONSOLE
 289         conswitchp = &dummy_con;
 290 #endif
 291
 292         ppc_md.setup_arch();
 293         if ( ppc_md.progress ) ppc_md.progress("arch: exit", 0x3eab);
 294
 295         paging_init();
 296 }