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 #include <asm/mmu_context.h>
  42
  43 #include "setup.h"
  44
  45 #define DBG(fmt...)
  46
  47 extern void bootx_init(unsigned long r4, unsigned long phys);
  48
  49 int boot_cpuid;
  50 EXPORT_SYMBOL_GPL(boot_cpuid);
  51 int boot_cpuid_phys;
  52
  53 int smp_hw_index[NR_CPUS];
  54
  55 unsigned long ISA_DMA_THRESHOLD;
  56 unsigned int DMA_MODE_READ;
  57 unsigned int DMA_MODE_WRITE;
  58
  59 #ifdef CONFIG_VGA_CONSOLE
  60 unsigned long vgacon_remap_base;
  61 EXPORT_SYMBOL(vgacon_remap_base);
  62 #endif
  63
  64 /*
  65  * These are used in binfmt_elf.c to put aux entries on the stack
  66  * for each elf executable being started.
  67  */
  68 int dcache_bsize;
  69 int icache_bsize;
  70 int ucache_bsize;
  71
  72 /*
  73  * We're called here very early in the boot.  We determine the machine
  74  * type and call the appropriate low-level setup functions.
  75  *  -- Cort <cort@fsmlabs.com>
  76  *
  77  * Note that the kernel may be running at an address which is different
  78  * from the address that it was linked at, so we must use RELOC/PTRRELOC
  79  * to access static data (including strings).  -- paulus
  80  */
  81 notrace unsigned long __init early_init(unsigned long dt_ptr)
  82 {
  83         unsigned long offset = reloc_offset();
  84         struct cpu_spec *spec;
  85
  86         /* First zero the BSS -- use memset_io, some platforms don't have
  87          * caches on yet */
  88         memset_io((void __iomem *)PTRRELOC(&__bss_start), 0,
  89                         __bss_stop - __bss_start);
  90
  91         /*
  92          * Identify the CPU type and fix up code sections
  93          * that depend on which cpu we have.
  94          */
  95         spec = identify_cpu(offset, mfspr(SPRN_PVR));
  96
  97         do_feature_fixups(spec->cpu_features,
  98                           PTRRELOC(&__start___ftr_fixup),
  99                           PTRRELOC(&__stop___ftr_fixup));
 100
 101         do_feature_fixups(spec->mmu_features,
 102                           PTRRELOC(&__start___mmu_ftr_fixup),
 103                           PTRRELOC(&__stop___mmu_ftr_fixup));
 104
 105         do_lwsync_fixups(spec->cpu_features,
 106                          PTRRELOC(&__start___lwsync_fixup),
 107                          PTRRELOC(&__stop___lwsync_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)
 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         setup_kdump_trampoline();
 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 #ifdef CONFIG_E500
 138         if (cpu_has_feature(CPU_FTR_CAN_DOZE) ||
 139             cpu_has_feature(CPU_FTR_CAN_NAP))
 140                 ppc_md.power_save = e500_idle;
 141 #endif
 142         if (ppc_md.progress)
 143                 ppc_md.progress("id mach(): done", 0x200);
 144 }
 145
 146 #ifdef CONFIG_BOOKE_WDT
 147 /* Checks wdt=x and wdt_period=xx command-line option */
 148 notrace int __init early_parse_wdt(char *p)
 149 {
 150         if (p && strncmp(p, "0", 1) != 0)
 151                booke_wdt_enabled = 1;
 152
 153         return 0;
 154 }
 155 early_param("wdt", early_parse_wdt);
 156
 157 int __init early_parse_wdt_period (char *p)
 158 {
 159         if (p)
 160                 booke_wdt_period = simple_strtoul(p, NULL, 0);
 161
 162         return 0;
 163 }
 164 early_param("wdt_period", early_parse_wdt_period);
 165 #endif  /* CONFIG_BOOKE_WDT */
 166
 167 /* Checks "l2cr=xxxx" command-line option */
 168 int __init ppc_setup_l2cr(char *str)
 169 {
 170         if (cpu_has_feature(CPU_FTR_L2CR)) {
 171                 unsigned long val = simple_strtoul(str, NULL, 0);
 172                 printk(KERN_INFO "l2cr set to %lx\n", val);
 173                 _set_L2CR(0);           /* force invalidate by disable cache */
 174                 _set_L2CR(val);         /* and enable it */
 175         }
 176         return 1;
 177 }
 178 __setup("l2cr=", ppc_setup_l2cr);
 179
 180 /* Checks "l3cr=xxxx" command-line option */
 181 int __init ppc_setup_l3cr(char *str)
 182 {
 183         if (cpu_has_feature(CPU_FTR_L3CR)) {
 184                 unsigned long val = simple_strtoul(str, NULL, 0);
 185                 printk(KERN_INFO "l3cr set to %lx\n", val);
 186                 _set_L3CR(val);         /* and enable it */
 187         }
 188         return 1;
 189 }
 190 __setup("l3cr=", ppc_setup_l3cr);
 191
 192 #ifdef CONFIG_GENERIC_NVRAM
 193
 194 /* Generic nvram hooks used by drivers/char/gen_nvram.c */
 195 unsigned char nvram_read_byte(int addr)
 196 {
 197         if (ppc_md.nvram_read_val)
 198                 return ppc_md.nvram_read_val(addr);
 199         return 0xff;
 200 }
 201 EXPORT_SYMBOL(nvram_read_byte);
 202
 203 void nvram_write_byte(unsigned char val, int addr)
 204 {
 205         if (ppc_md.nvram_write_val)
 206                 ppc_md.nvram_write_val(addr, val);
 207 }
 208 EXPORT_SYMBOL(nvram_write_byte);
 209
 210 void nvram_sync(void)
 211 {
 212         if (ppc_md.nvram_sync)
 213                 ppc_md.nvram_sync();
 214 }
 215 EXPORT_SYMBOL(nvram_sync);
 216
 217 #endif /* CONFIG_NVRAM */
 218
 219 int __init ppc_init(void)
 220 {
 221         /* clear the progress line */
 222         if (ppc_md.progress)
 223                 ppc_md.progress("             ", 0xffff);
 224
 225         /* call platform init */
 226         if (ppc_md.init != NULL) {
 227                 ppc_md.init();
 228         }
 229         return 0;
 230 }
 231
 232 arch_initcall(ppc_init);
 233
 234 #ifdef CONFIG_IRQSTACKS
 235 static void __init irqstack_early_init(void)
 236 {
 237         unsigned int i;
 238
 239         /* interrupt stacks must be in lowmem, we get that for free on ppc32
 240          * as the lmb is limited to lowmem by LMB_REAL_LIMIT */
 241         for_each_possible_cpu(i) {
 242                 softirq_ctx[i] = (struct thread_info *)
 243                         __va(lmb_alloc(THREAD_SIZE, THREAD_SIZE));
 244                 hardirq_ctx[i] = (struct thread_info *)
 245                         __va(lmb_alloc(THREAD_SIZE, THREAD_SIZE));
 246         }
 247 }
 248 #else
 249 #define irqstack_early_init()
 250 #endif
 251
 252 #if defined(CONFIG_BOOKE) || defined(CONFIG_40x)
 253 static void __init exc_lvl_early_init(void)
 254 {
 255         unsigned int i;
 256
 257         /* interrupt stacks must be in lowmem, we get that for free on ppc32
 258          * as the lmb is limited to lowmem by LMB_REAL_LIMIT */
 259         for_each_possible_cpu(i) {
 260                 critirq_ctx[i] = (struct thread_info *)
 261                         __va(lmb_alloc(THREAD_SIZE, THREAD_SIZE));
 262 #ifdef CONFIG_BOOKE
 263                 dbgirq_ctx[i] = (struct thread_info *)
 264                         __va(lmb_alloc(THREAD_SIZE, THREAD_SIZE));
 265                 mcheckirq_ctx[i] = (struct thread_info *)
 266                         __va(lmb_alloc(THREAD_SIZE, THREAD_SIZE));
 267 #endif
 268         }
 269 }
 270 #else
 271 #define exc_lvl_early_init()
 272 #endif
 273
 274 /* Warning, IO base is not yet inited */
 275 void __init setup_arch(char **cmdline_p)
 276 {
 277         *cmdline_p = cmd_line;
 278
 279         /* so udelay does something sensible, assume <= 1000 bogomips */
 280         loops_per_jiffy = 500000000 / HZ;
 281
 282         unflatten_device_tree();
 283         check_for_initrd();
 284
 285         if (ppc_md.init_early)
 286                 ppc_md.init_early();
 287
 288         find_legacy_serial_ports();
 289
 290         smp_setup_cpu_maps();
 291
 292         /* Register early console */
 293         register_early_udbg_console();
 294
 295         xmon_setup();
 296
 297         /*
 298          * Set cache line size based on type of cpu as a default.
 299          * Systems with OF can look in the properties on the cpu node(s)
 300          * for a possibly more accurate value.
 301          */
 302         dcache_bsize = cur_cpu_spec->dcache_bsize;
 303         icache_bsize = cur_cpu_spec->icache_bsize;
 304         ucache_bsize = 0;
 305         if (cpu_has_feature(CPU_FTR_UNIFIED_ID_CACHE))
 306                 ucache_bsize = icache_bsize = dcache_bsize;
 307
 308         /* reboot on panic */
 309         panic_timeout = 180;
 310
 311         if (ppc_md.panic)
 312                 setup_panic();
 313
 314         init_mm.start_code = (unsigned long)_stext;
 315         init_mm.end_code = (unsigned long) _etext;
 316         init_mm.end_data = (unsigned long) _edata;
 317         init_mm.brk = klimit;
 318
 319         exc_lvl_early_init();
 320
 321         irqstack_early_init();
 322
 323         /* set up the bootmem stuff with available memory */
 324         do_init_bootmem();
 325         if ( ppc_md.progress ) ppc_md.progress("setup_arch: bootmem", 0x3eab);
 326
 327 #ifdef CONFIG_DUMMY_CONSOLE
 328         conswitchp = &dummy_con;
 329 #endif
 330
 331         if (ppc_md.setup_arch)
 332                 ppc_md.setup_arch();
 333         if ( ppc_md.progress ) ppc_md.progress("arch: exit", 0x3eab);
 334
 335         paging_init();
 336
 337         /* Initialize the MMU context management stuff */
 338         mmu_context_init();
 339
 340 }