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/tty.h>
  14 #include <linux/bootmem.h>
  15 #include <linux/seq_file.h>
  16 #include <linux/root_dev.h>
  17 #include <linux/cpu.h>
  18 #include <linux/console.h>
  19 #include <linux/lmb.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 #ifdef CONFIG_FTRACE
  51 extern void _mcount(void);
  52 EXPORT_SYMBOL(_mcount);
  53 #endif
  54
  55 extern void bootx_init(unsigned long r4, unsigned long phys);
  56
  57 int boot_cpuid;
  58 EXPORT_SYMBOL_GPL(boot_cpuid);
  59 int boot_cpuid_phys;
  60
  61 unsigned long ISA_DMA_THRESHOLD;
  62 unsigned int DMA_MODE_READ;
  63 unsigned int DMA_MODE_WRITE;
  64
  65 int have_of = 1;
  66
  67 #ifdef CONFIG_VGA_CONSOLE
  68 unsigned long vgacon_remap_base;
  69 EXPORT_SYMBOL(vgacon_remap_base);
  70 #endif
  71
  72 /*
  73  * These are used in binfmt_elf.c to put aux entries on the stack
  74  * for each elf executable being started.
  75  */
  76 int dcache_bsize;
  77 int icache_bsize;
  78 int ucache_bsize;
  79
  80 /*
  81  * We're called here very early in the boot.  We determine the machine
  82  * type and call the appropriate low-level setup functions.
  83  *  -- Cort <cort@fsmlabs.com>
  84  *
  85  * Note that the kernel may be running at an address which is different
  86  * from the address that it was linked at, so we must use RELOC/PTRRELOC
  87  * to access static data (including strings).  -- paulus
  88  */
  89 notrace unsigned long __init early_init(unsigned long dt_ptr)
  90 {
  91         unsigned long offset = reloc_offset();
  92         struct cpu_spec *spec;
  93
  94         /* First zero the BSS -- use memset_io, some platforms don't have
  95          * caches on yet */
  96         memset_io((void __iomem *)PTRRELOC(&__bss_start), 0,
  97                         __bss_stop - __bss_start);
  98
  99         /*
 100          * Identify the CPU type and fix up code sections
 101          * that depend on which cpu we have.
 102          */
 103         spec = identify_cpu(offset, mfspr(SPRN_PVR));
 104
 105         do_feature_fixups(spec->cpu_features,
 106                           PTRRELOC(&__start___ftr_fixup),
 107                           PTRRELOC(&__stop___ftr_fixup));
 108
 109         return KERNELBASE + offset;
 110 }
 111
 112
 113 /*
 114  * Find out what kind of machine we're on and save any data we need
 115  * from the early boot process (devtree is copied on pmac by prom_init()).
 116  * This is called very early on the boot process, after a minimal
 117  * MMU environment has been set up but before MMU_init is called.
 118  */
 119 notrace void __init machine_init(unsigned long dt_ptr, unsigned long phys)
 120 {
 121         /* Enable early debugging if any specified (see udbg.h) */
 122         udbg_early_init();
 123
 124         /* Do some early initialization based on the flat device tree */
 125         early_init_devtree(__va(dt_ptr));
 126
 127         probe_machine();
 128
 129 #ifdef CONFIG_6xx
 130         if (cpu_has_feature(CPU_FTR_CAN_DOZE) ||
 131             cpu_has_feature(CPU_FTR_CAN_NAP))
 132                 ppc_md.power_save = ppc6xx_idle;
 133 #endif
 134
 135         if (ppc_md.progress)
 136                 ppc_md.progress("id mach(): done", 0x200);
 137 }
 138
 139 #ifdef CONFIG_BOOKE_WDT
 140 /* Checks wdt=x and wdt_period=xx command-line option */
 141 notrace int __init early_parse_wdt(char *p)
 142 {
 143         if (p && strncmp(p, "0", 1) != 0)
 144                booke_wdt_enabled = 1;
 145
 146         return 0;
 147 }
 148 early_param("wdt", early_parse_wdt);
 149
 150 int __init early_parse_wdt_period (char *p)
 151 {
 152         if (p)
 153                 booke_wdt_period = simple_strtoul(p, NULL, 0);
 154
 155         return 0;
 156 }
 157 early_param("wdt_period", early_parse_wdt_period);
 158 #endif  /* CONFIG_BOOKE_WDT */
 159
 160 /* Checks "l2cr=xxxx" command-line option */
 161 int __init ppc_setup_l2cr(char *str)
 162 {
 163         if (cpu_has_feature(CPU_FTR_L2CR)) {
 164                 unsigned long val = simple_strtoul(str, NULL, 0);
 165                 printk(KERN_INFO "l2cr set to %lx\n", val);
 166                 _set_L2CR(0);           /* force invalidate by disable cache */
 167                 _set_L2CR(val);         /* and enable it */
 168         }
 169         return 1;
 170 }
 171 __setup("l2cr=", ppc_setup_l2cr);
 172
 173 /* Checks "l3cr=xxxx" command-line option */
 174 int __init ppc_setup_l3cr(char *str)
 175 {
 176         if (cpu_has_feature(CPU_FTR_L3CR)) {
 177                 unsigned long val = simple_strtoul(str, NULL, 0);
 178                 printk(KERN_INFO "l3cr set to %lx\n", val);
 179                 _set_L3CR(val);         /* and enable it */
 180         }
 181         return 1;
 182 }
 183 __setup("l3cr=", ppc_setup_l3cr);
 184
 185 #ifdef CONFIG_GENERIC_NVRAM
 186
 187 /* Generic nvram hooks used by drivers/char/gen_nvram.c */
 188 unsigned char nvram_read_byte(int addr)
 189 {
 190         if (ppc_md.nvram_read_val)
 191                 return ppc_md.nvram_read_val(addr);
 192         return 0xff;
 193 }
 194 EXPORT_SYMBOL(nvram_read_byte);
 195
 196 void nvram_write_byte(unsigned char val, int addr)
 197 {
 198         if (ppc_md.nvram_write_val)
 199                 ppc_md.nvram_write_val(addr, val);
 200 }
 201 EXPORT_SYMBOL(nvram_write_byte);
 202
 203 void nvram_sync(void)
 204 {
 205         if (ppc_md.nvram_sync)
 206                 ppc_md.nvram_sync();
 207 }
 208 EXPORT_SYMBOL(nvram_sync);
 209
 210 #endif /* CONFIG_NVRAM */
 211
 212 static DEFINE_PER_CPU(struct cpu, cpu_devices);
 213
 214 int __init ppc_init(void)
 215 {
 216         int cpu;
 217
 218         /* clear the progress line */
 219         if (ppc_md.progress)
 220                 ppc_md.progress("             ", 0xffff);
 221
 222         /* register CPU devices */
 223         for_each_possible_cpu(cpu) {
 224                 struct cpu *c = &per_cpu(cpu_devices, cpu);
 225                 c->hotpluggable = 1;
 226                 register_cpu(c, cpu);
 227         }
 228
 229         /* call platform init */
 230         if (ppc_md.init != NULL) {
 231                 ppc_md.init();
 232         }
 233         return 0;
 234 }
 235
 236 arch_initcall(ppc_init);
 237
 238 #ifdef CONFIG_IRQSTACKS
 239 static void __init irqstack_early_init(void)
 240 {
 241         unsigned int i;
 242
 243         /* interrupt stacks must be in lowmem, we get that for free on ppc32
 244          * as the lmb is limited to lowmem by LMB_REAL_LIMIT */
 245         for_each_possible_cpu(i) {
 246                 softirq_ctx[i] = (struct thread_info *)
 247                         __va(lmb_alloc(THREAD_SIZE, THREAD_SIZE));
 248                 hardirq_ctx[i] = (struct thread_info *)
 249                         __va(lmb_alloc(THREAD_SIZE, THREAD_SIZE));
 250         }
 251 }
 252 #else
 253 #define irqstack_early_init()
 254 #endif
 255
 256 /* Warning, IO base is not yet inited */
 257 void __init setup_arch(char **cmdline_p)
 258 {
 259         *cmdline_p = cmd_line;
 260
 261         /* so udelay does something sensible, assume <= 1000 bogomips */
 262         loops_per_jiffy = 500000000 / HZ;
 263
 264         unflatten_device_tree();
 265         check_for_initrd();
 266
 267         if (ppc_md.init_early)
 268                 ppc_md.init_early();
 269
 270         find_legacy_serial_ports();
 271
 272         smp_setup_cpu_maps();
 273
 274         /* Register early console */
 275         register_early_udbg_console();
 276
 277         xmon_setup();
 278
 279 #if defined(CONFIG_KGDB)
 280         if (ppc_md.kgdb_map_scc)
 281                 ppc_md.kgdb_map_scc();
 282         set_debug_traps();
 283         if (strstr(cmd_line, "gdb")) {
 284                 if (ppc_md.progress)
 285                         ppc_md.progress("setup_arch: kgdb breakpoint", 0x4000);
 286                 printk("kgdb breakpoint activated\n");
 287                 breakpoint();
 288         }
 289 #endif
 290
 291         /*
 292          * Set cache line size based on type of cpu as a default.
 293          * Systems with OF can look in the properties on the cpu node(s)
 294          * for a possibly more accurate value.
 295          */
 296         dcache_bsize = cur_cpu_spec->dcache_bsize;
 297         icache_bsize = cur_cpu_spec->icache_bsize;
 298         ucache_bsize = 0;
 299         if (cpu_has_feature(CPU_FTR_UNIFIED_ID_CACHE))
 300                 ucache_bsize = icache_bsize = dcache_bsize;
 301
 302         /* reboot on panic */
 303         panic_timeout = 180;
 304
 305         if (ppc_md.panic)
 306                 setup_panic();
 307
 308         init_mm.start_code = (unsigned long)_stext;
 309         init_mm.end_code = (unsigned long) _etext;
 310         init_mm.end_data = (unsigned long) _edata;
 311         init_mm.brk = klimit;
 312
 313         irqstack_early_init();
 314
 315         /* set up the bootmem stuff with available memory */
 316         do_init_bootmem();
 317         if ( ppc_md.progress ) ppc_md.progress("setup_arch: bootmem", 0x3eab);
 318
 319 #ifdef CONFIG_DUMMY_CONSOLE
 320         conswitchp = &dummy_con;
 321 #endif
 322
 323         if (ppc_md.setup_arch)
 324                 ppc_md.setup_arch();
 325         if ( ppc_md.progress ) ppc_md.progress("arch: exit", 0x3eab);
 326
 327         paging_init();
 328 }