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 #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 #ifdef CONFIG_E500
 136         if (cpu_has_feature(CPU_FTR_CAN_DOZE) ||
 137             cpu_has_feature(CPU_FTR_CAN_NAP))
 138                 ppc_md.power_save = e500_idle;
 139 #endif
 140         if (ppc_md.progress)
 141                 ppc_md.progress("id mach(): done", 0x200);
 142 }
 143
 144 #ifdef CONFIG_BOOKE_WDT
 145 /* Checks wdt=x and wdt_period=xx command-line option */
 146 notrace int __init early_parse_wdt(char *p)
 147 {
 148         if (p && strncmp(p, "0", 1) != 0)
 149                booke_wdt_enabled = 1;
 150
 151         return 0;
 152 }
 153 early_param("wdt", early_parse_wdt);
 154
 155 int __init early_parse_wdt_period (char *p)
 156 {
 157         if (p)
 158                 booke_wdt_period = simple_strtoul(p, NULL, 0);
 159
 160         return 0;
 161 }
 162 early_param("wdt_period", early_parse_wdt_period);
 163 #endif  /* CONFIG_BOOKE_WDT */
 164
 165 /* Checks "l2cr=xxxx" command-line option */
 166 int __init ppc_setup_l2cr(char *str)
 167 {
 168         if (cpu_has_feature(CPU_FTR_L2CR)) {
 169                 unsigned long val = simple_strtoul(str, NULL, 0);
 170                 printk(KERN_INFO "l2cr set to %lx\n", val);
 171                 _set_L2CR(0);           /* force invalidate by disable cache */
 172                 _set_L2CR(val);         /* and enable it */
 173         }
 174         return 1;
 175 }
 176 __setup("l2cr=", ppc_setup_l2cr);
 177
 178 /* Checks "l3cr=xxxx" command-line option */
 179 int __init ppc_setup_l3cr(char *str)
 180 {
 181         if (cpu_has_feature(CPU_FTR_L3CR)) {
 182                 unsigned long val = simple_strtoul(str, NULL, 0);
 183                 printk(KERN_INFO "l3cr set to %lx\n", val);
 184                 _set_L3CR(val);         /* and enable it */
 185         }
 186         return 1;
 187 }
 188 __setup("l3cr=", ppc_setup_l3cr);
 189
 190 #ifdef CONFIG_GENERIC_NVRAM
 191
 192 /* Generic nvram hooks used by drivers/char/gen_nvram.c */
 193 unsigned char nvram_read_byte(int addr)
 194 {
 195         if (ppc_md.nvram_read_val)
 196                 return ppc_md.nvram_read_val(addr);
 197         return 0xff;
 198 }
 199 EXPORT_SYMBOL(nvram_read_byte);
 200
 201 void nvram_write_byte(unsigned char val, int addr)
 202 {
 203         if (ppc_md.nvram_write_val)
 204                 ppc_md.nvram_write_val(addr, val);
 205 }
 206 EXPORT_SYMBOL(nvram_write_byte);
 207
 208 void nvram_sync(void)
 209 {
 210         if (ppc_md.nvram_sync)
 211                 ppc_md.nvram_sync();
 212 }
 213 EXPORT_SYMBOL(nvram_sync);
 214
 215 #endif /* CONFIG_NVRAM */
 216
 217 int __init ppc_init(void)
 218 {
 219         /* clear the progress line */
 220         if (ppc_md.progress)
 221                 ppc_md.progress("             ", 0xffff);
 222
 223         /* call platform init */
 224         if (ppc_md.init != NULL) {
 225                 ppc_md.init();
 226         }
 227         return 0;
 228 }
 229
 230 arch_initcall(ppc_init);
 231
 232 #ifdef CONFIG_IRQSTACKS
 233 static void __init irqstack_early_init(void)
 234 {
 235         unsigned int i;
 236
 237         /* interrupt stacks must be in lowmem, we get that for free on ppc32
 238          * as the lmb is limited to lowmem by LMB_REAL_LIMIT */
 239         for_each_possible_cpu(i) {
 240                 softirq_ctx[i] = (struct thread_info *)
 241                         __va(lmb_alloc(THREAD_SIZE, THREAD_SIZE));
 242                 hardirq_ctx[i] = (struct thread_info *)
 243                         __va(lmb_alloc(THREAD_SIZE, THREAD_SIZE));
 244         }
 245 }
 246 #else
 247 #define irqstack_early_init()
 248 #endif
 249
 250 #if defined(CONFIG_BOOKE) || defined(CONFIG_40x)
 251 static void __init exc_lvl_early_init(void)
 252 {
 253         unsigned int i;
 254
 255         /* interrupt stacks must be in lowmem, we get that for free on ppc32
 256          * as the lmb is limited to lowmem by LMB_REAL_LIMIT */
 257         for_each_possible_cpu(i) {
 258                 critirq_ctx[i] = (struct thread_info *)
 259                         __va(lmb_alloc(THREAD_SIZE, THREAD_SIZE));
 260 #ifdef CONFIG_BOOKE
 261                 dbgirq_ctx[i] = (struct thread_info *)
 262                         __va(lmb_alloc(THREAD_SIZE, THREAD_SIZE));
 263                 mcheckirq_ctx[i] = (struct thread_info *)
 264                         __va(lmb_alloc(THREAD_SIZE, THREAD_SIZE));
 265 #endif
 266         }
 267 }
 268 #else
 269 #define exc_lvl_early_init()
 270 #endif
 271
 272 /* Warning, IO base is not yet inited */
 273 void __init setup_arch(char **cmdline_p)
 274 {
 275         *cmdline_p = cmd_line;
 276
 277         /* so udelay does something sensible, assume <= 1000 bogomips */
 278         loops_per_jiffy = 500000000 / HZ;
 279
 280         unflatten_device_tree();
 281         check_for_initrd();
 282
 283         if (ppc_md.init_early)
 284                 ppc_md.init_early();
 285
 286         find_legacy_serial_ports();
 287
 288         smp_setup_cpu_maps();
 289
 290         /* Register early console */
 291         register_early_udbg_console();
 292
 293         xmon_setup();
 294
 295         /*
 296          * Set cache line size based on type of cpu as a default.
 297          * Systems with OF can look in the properties on the cpu node(s)
 298          * for a possibly more accurate value.
 299          */
 300         dcache_bsize = cur_cpu_spec->dcache_bsize;
 301         icache_bsize = cur_cpu_spec->icache_bsize;
 302         ucache_bsize = 0;
 303         if (cpu_has_feature(CPU_FTR_UNIFIED_ID_CACHE))
 304                 ucache_bsize = icache_bsize = dcache_bsize;
 305
 306         /* reboot on panic */
 307         panic_timeout = 180;
 308
 309         if (ppc_md.panic)
 310                 setup_panic();
 311
 312         init_mm.start_code = (unsigned long)_stext;
 313         init_mm.end_code = (unsigned long) _etext;
 314         init_mm.end_data = (unsigned long) _edata;
 315         init_mm.brk = klimit;
 316
 317         exc_lvl_early_init();
 318
 319         irqstack_early_init();
 320
 321         /* set up the bootmem stuff with available memory */
 322         do_init_bootmem();
 323         if ( ppc_md.progress ) ppc_md.progress("setup_arch: bootmem", 0x3eab);
 324
 325 #ifdef CONFIG_DUMMY_CONSOLE
 326         conswitchp = &dummy_con;
 327 #endif
 328
 329         if (ppc_md.setup_arch)
 330                 ppc_md.setup_arch();
 331         if ( ppc_md.progress ) ppc_md.progress("arch: exit", 0x3eab);
 332
 333         paging_init();
 334
 335         /* Initialize the MMU context management stuff */
 336         mmu_context_init();
 337
 338 }