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