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