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 #if defined(CONFIG_IDE) || defined(CONFIG_IDE_MODULE)
  14 #include <linux/ide.h>
  15 #endif
  16 #include <linux/tty.h>
  17 #include <linux/bootmem.h>
  18 #include <linux/seq_file.h>
  19 #include <linux/root_dev.h>
  20 #include <linux/cpu.h>
  21 #include <linux/console.h>
  22
  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/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 #if defined(CONFIG_BLK_DEV_IDE) || defined(CONFIG_BLK_DEV_IDE_MODULE)
  55 struct ide_machdep_calls ppc_ide_md;
  56 EXPORT_SYMBOL(ppc_ide_md);
  57 #endif
  58
  59 int boot_cpuid;
  60 EXPORT_SYMBOL_GPL(boot_cpuid);
  61 int boot_cpuid_phys;
  62
  63 unsigned long ISA_DMA_THRESHOLD;
  64 unsigned int DMA_MODE_READ;
  65 unsigned int DMA_MODE_WRITE;
  66
  67 int have_of = 1;
  68
  69 #ifdef CONFIG_VGA_CONSOLE
  70 unsigned long vgacon_remap_base;
  71 EXPORT_SYMBOL(vgacon_remap_base);
  72 #endif
  73
  74 /*
  75  * These are used in binfmt_elf.c to put aux entries on the stack
  76  * for each elf executable being started.
  77  */
  78 int dcache_bsize;
  79 int icache_bsize;
  80 int ucache_bsize;
  81
  82 /*
  83  * We're called here very early in the boot.  We determine the machine
  84  * type and call the appropriate low-level setup functions.
  85  *  -- Cort <cort@fsmlabs.com>
  86  *
  87  * Note that the kernel may be running at an address which is different
  88  * from the address that it was linked at, so we must use RELOC/PTRRELOC
  89  * to access static data (including strings).  -- paulus
  90  */
  91 unsigned long __init early_init(unsigned long dt_ptr)
  92 {
  93         unsigned long offset = reloc_offset();
  94         struct cpu_spec *spec;
  95
  96         /* First zero the BSS -- use memset_io, some platforms don't have
  97          * caches on yet */
  98         memset_io((void __iomem *)PTRRELOC(&__bss_start), 0,
  99                         __bss_stop - __bss_start);
 100
 101         /*
 102          * Identify the CPU type and fix up code sections
 103          * that depend on which cpu we have.
 104          */
 105         spec = identify_cpu(offset, mfspr(SPRN_PVR));
 106
 107         do_feature_fixups(spec->cpu_features,
 108                           PTRRELOC(&__start___ftr_fixup),
 109                           PTRRELOC(&__stop___ftr_fixup));
 110
 111         return KERNELBASE + offset;
 112 }
 113
 114
 115 /*
 116  * Find out what kind of machine we're on and save any data we need
 117  * from the early boot process (devtree is copied on pmac by prom_init()).
 118  * This is called very early on the boot process, after a minimal
 119  * MMU environment has been set up but before MMU_init is called.
 120  */
 121 void __init machine_init(unsigned long dt_ptr, unsigned long phys)
 122 {
 123         /* Enable early debugging if any specified (see udbg.h) */
 124         udbg_early_init();
 125
 126         /* Do some early initialization based on the flat device tree */
 127         early_init_devtree(__va(dt_ptr));
 128
 129         probe_machine();
 130
 131 #ifdef CONFIG_6xx
 132         if (cpu_has_feature(CPU_FTR_CAN_DOZE) ||
 133             cpu_has_feature(CPU_FTR_CAN_NAP))
 134                 ppc_md.power_save = ppc6xx_idle;
 135 #endif
 136
 137         if (ppc_md.progress)
 138                 ppc_md.progress("id mach(): done", 0x200);
 139 }
 140
 141 #ifdef CONFIG_BOOKE_WDT
 142 /* Checks wdt=x and wdt_period=xx command-line option */
 143 int __init early_parse_wdt(char *p)
 144 {
 145         if (p && strncmp(p, "0", 1) != 0)
 146                booke_wdt_enabled = 1;
 147
 148         return 0;
 149 }
 150 early_param("wdt", early_parse_wdt);
 151
 152 int __init early_parse_wdt_period (char *p)
 153 {
 154         if (p)
 155                 booke_wdt_period = simple_strtoul(p, NULL, 0);
 156
 157         return 0;
 158 }
 159 early_param("wdt_period", early_parse_wdt_period);
 160 #endif  /* CONFIG_BOOKE_WDT */
 161
 162 /* Checks "l2cr=xxxx" command-line option */
 163 int __init ppc_setup_l2cr(char *str)
 164 {
 165         if (cpu_has_feature(CPU_FTR_L2CR)) {
 166                 unsigned long val = simple_strtoul(str, NULL, 0);
 167                 printk(KERN_INFO "l2cr set to %lx\n", val);
 168                 _set_L2CR(0);           /* force invalidate by disable cache */
 169                 _set_L2CR(val);         /* and enable it */
 170         }
 171         return 1;
 172 }
 173 __setup("l2cr=", ppc_setup_l2cr);
 174
 175 #ifdef CONFIG_GENERIC_NVRAM
 176
 177 /* Generic nvram hooks used by drivers/char/gen_nvram.c */
 178 unsigned char nvram_read_byte(int addr)
 179 {
 180         if (ppc_md.nvram_read_val)
 181                 return ppc_md.nvram_read_val(addr);
 182         return 0xff;
 183 }
 184 EXPORT_SYMBOL(nvram_read_byte);
 185
 186 void nvram_write_byte(unsigned char val, int addr)
 187 {
 188         if (ppc_md.nvram_write_val)
 189                 ppc_md.nvram_write_val(addr, val);
 190 }
 191 EXPORT_SYMBOL(nvram_write_byte);
 192
 193 void nvram_sync(void)
 194 {
 195         if (ppc_md.nvram_sync)
 196                 ppc_md.nvram_sync();
 197 }
 198 EXPORT_SYMBOL(nvram_sync);
 199
 200 #endif /* CONFIG_NVRAM */
 201
 202 static DEFINE_PER_CPU(struct cpu, cpu_devices);
 203
 204 int __init ppc_init(void)
 205 {
 206         int cpu;
 207
 208         /* clear the progress line */
 209         if (ppc_md.progress)
 210                 ppc_md.progress("             ", 0xffff);
 211
 212         /* register CPU devices */
 213         for_each_possible_cpu(cpu) {
 214                 struct cpu *c = &per_cpu(cpu_devices, cpu);
 215                 c->hotpluggable = 1;
 216                 register_cpu(c, cpu);
 217         }
 218
 219         /* call platform init */
 220         if (ppc_md.init != NULL) {
 221                 ppc_md.init();
 222         }
 223         return 0;
 224 }
 225
 226 arch_initcall(ppc_init);
 227
 228 /* Warning, IO base is not yet inited */
 229 void __init setup_arch(char **cmdline_p)
 230 {
 231         *cmdline_p = cmd_line;
 232
 233         /* so udelay does something sensible, assume <= 1000 bogomips */
 234         loops_per_jiffy = 500000000 / HZ;
 235
 236         unflatten_device_tree();
 237         check_for_initrd();
 238
 239         if (ppc_md.init_early)
 240                 ppc_md.init_early();
 241
 242         find_legacy_serial_ports();
 243
 244         smp_setup_cpu_maps();
 245
 246         /* Register early console */
 247         register_early_udbg_console();
 248
 249         xmon_setup();
 250
 251 #if defined(CONFIG_KGDB)
 252         if (ppc_md.kgdb_map_scc)
 253                 ppc_md.kgdb_map_scc();
 254         set_debug_traps();
 255         if (strstr(cmd_line, "gdb")) {
 256                 if (ppc_md.progress)
 257                         ppc_md.progress("setup_arch: kgdb breakpoint", 0x4000);
 258                 printk("kgdb breakpoint activated\n");
 259                 breakpoint();
 260         }
 261 #endif
 262
 263         /*
 264          * Set cache line size based on type of cpu as a default.
 265          * Systems with OF can look in the properties on the cpu node(s)
 266          * for a possibly more accurate value.
 267          */
 268         dcache_bsize = cur_cpu_spec->dcache_bsize;
 269         icache_bsize = cur_cpu_spec->icache_bsize;
 270         ucache_bsize = 0;
 271         if (cpu_has_feature(CPU_FTR_UNIFIED_ID_CACHE))
 272                 ucache_bsize = icache_bsize = dcache_bsize;
 273
 274         /* reboot on panic */
 275         panic_timeout = 180;
 276
 277         if (ppc_md.panic)
 278                 setup_panic();
 279
 280         init_mm.start_code = PAGE_OFFSET;
 281         init_mm.end_code = (unsigned long) _etext;
 282         init_mm.end_data = (unsigned long) _edata;
 283         init_mm.brk = klimit;
 284
 285         /* set up the bootmem stuff with available memory */
 286         do_init_bootmem();
 287         if ( ppc_md.progress ) ppc_md.progress("setup_arch: bootmem", 0x3eab);
 288
 289 #ifdef CONFIG_DUMMY_CONSOLE
 290         conswitchp = &dummy_con;
 291 #endif
 292
 293         if (ppc_md.setup_arch)
 294                 ppc_md.setup_arch();
 295         if ( ppc_md.progress ) ppc_md.progress("arch: exit", 0x3eab);
 296
 297         paging_init();
 298 }