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/residual.h>
  22 #include <asm/io.h>
  23 #include <asm/prom.h>
  24 #include <asm/processor.h>
  25 #include <asm/pgtable.h>
  26 #include <asm/setup.h>
  27 #include <asm/amigappc.h>
  28 #include <asm/smp.h>
  29 #include <asm/elf.h>
  30 #include <asm/cputable.h>
  31 #include <asm/bootx.h>
  32 #include <asm/btext.h>
  33 #include <asm/machdep.h>
  34 #include <asm/uaccess.h>
  35 #include <asm/system.h>
  36 #include <asm/pmac_feature.h>
  37 #include <asm/sections.h>
  38 #include <asm/nvram.h>
  39 #include <asm/xmon.h>
  40 #include <asm/time.h>
  41 #include <asm/serial.h>
  42 #include <asm/udbg.h>
  43
  44 #include "setup.h"
  45
  46 #define DBG(fmt...)
  47
  48 #if defined CONFIG_KGDB
  49 #include <asm/kgdb.h>
  50 #endif
  51
  52 extern void bootx_init(unsigned long r4, unsigned long phys);
  53
  54 boot_infos_t *boot_infos;
  55 struct ide_machdep_calls ppc_ide_md;
  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_PPC_MULTIPLATFORM
  68 dev_t boot_dev;
  69 #endif /* CONFIG_PPC_MULTIPLATFORM */
  70
  71 #ifdef CONFIG_MAGIC_SYSRQ
  72 unsigned long SYSRQ_KEY = 0x54;
  73 #endif /* CONFIG_MAGIC_SYSRQ */
  74
  75 #ifdef CONFIG_VGA_CONSOLE
  76 unsigned long vgacon_remap_base;
  77 #endif
  78
  79 /*
  80  * These are used in binfmt_elf.c to put aux entries on the stack
  81  * for each elf executable being started.
  82  */
  83 int dcache_bsize;
  84 int icache_bsize;
  85 int ucache_bsize;
  86
  87 /*
  88  * We're called here very early in the boot.  We determine the machine
  89  * type and call the appropriate low-level setup functions.
  90  *  -- Cort <cort@fsmlabs.com>
  91  *
  92  * Note that the kernel may be running at an address which is different
  93  * from the address that it was linked at, so we must use RELOC/PTRRELOC
  94  * to access static data (including strings).  -- paulus
  95  */
  96 unsigned long __init early_init(unsigned long dt_ptr)
  97 {
  98         unsigned long offset = reloc_offset();
  99
 100         /* First zero the BSS -- use memset_io, some platforms don't have
 101          * caches on yet */
 102         memset_io((void __iomem *)PTRRELOC(&__bss_start), 0, _end - __bss_start);
 103
 104         /*
 105          * Identify the CPU type and fix up code sections
 106          * that depend on which cpu we have.
 107          */
 108         identify_cpu(offset, 0);
 109         do_cpu_ftr_fixups(offset);
 110
 111         return KERNELBASE + offset;
 112 }
 113
 114
 115 /*
 116  * Find out what kind of machine we're on and save any data we need
 117  * from the early boot process (devtree is copied on pmac by prom_init()).
 118  * This is called very early on the boot process, after a minimal
 119  * MMU environment has been set up but before MMU_init is called.
 120  */
 121 void __init machine_init(unsigned long dt_ptr, unsigned long phys)
 122 {
 123         /* If btext is enabled, we might have a BAT setup for early display,
 124          * thus we do enable some very basic udbg output
 125          */
 126 #ifdef CONFIG_BOOTX_TEXT
 127         udbg_putc = btext_drawchar;
 128 #endif
 129
 130         /* Do some early initialization based on the flat device tree */
 131         early_init_devtree(__va(dt_ptr));
 132
 133         probe_machine();
 134
 135 #ifdef CONFIG_6xx
 136         if (cpu_has_feature(CPU_FTR_CAN_DOZE) ||
 137             cpu_has_feature(CPU_FTR_CAN_NAP))
 138                 ppc_md.power_save = ppc6xx_idle;
 139 #endif
 140
 141         if (ppc_md.progress)
 142                 ppc_md.progress("id mach(): done", 0x200);
 143 }
 144
 145 #ifdef CONFIG_BOOKE_WDT
 146 /* Checks wdt=x and wdt_period=xx command-line option */
 147 int __init early_parse_wdt(char *p)
 148 {
 149         if (p && strncmp(p, "0", 1) != 0)
 150                booke_wdt_enabled = 1;
 151
 152         return 0;
 153 }
 154 early_param("wdt", early_parse_wdt);
 155
 156 int __init early_parse_wdt_period (char *p)
 157 {
 158         if (p)
 159                 booke_wdt_period = simple_strtoul(p, NULL, 0);
 160
 161         return 0;
 162 }
 163 early_param("wdt_period", early_parse_wdt_period);
 164 #endif  /* CONFIG_BOOKE_WDT */
 165
 166 /* Checks "l2cr=xxxx" command-line option */
 167 int __init ppc_setup_l2cr(char *str)
 168 {
 169         if (cpu_has_feature(CPU_FTR_L2CR)) {
 170                 unsigned long val = simple_strtoul(str, NULL, 0);
 171                 printk(KERN_INFO "l2cr set to %lx\n", val);
 172                 _set_L2CR(0);           /* force invalidate by disable cache */
 173                 _set_L2CR(val);         /* and enable it */
 174         }
 175         return 1;
 176 }
 177 __setup("l2cr=", ppc_setup_l2cr);
 178
 179 #ifdef CONFIG_GENERIC_NVRAM
 180
 181 /* Generic nvram hooks used by drivers/char/gen_nvram.c */
 182 unsigned char nvram_read_byte(int addr)
 183 {
 184         if (ppc_md.nvram_read_val)
 185                 return ppc_md.nvram_read_val(addr);
 186         return 0xff;
 187 }
 188 EXPORT_SYMBOL(nvram_read_byte);
 189
 190 void nvram_write_byte(unsigned char val, int addr)
 191 {
 192         if (ppc_md.nvram_write_val)
 193                 ppc_md.nvram_write_val(addr, val);
 194 }
 195 EXPORT_SYMBOL(nvram_write_byte);
 196
 197 void nvram_sync(void)
 198 {
 199         if (ppc_md.nvram_sync)
 200                 ppc_md.nvram_sync();
 201 }
 202 EXPORT_SYMBOL(nvram_sync);
 203
 204 #endif /* CONFIG_NVRAM */
 205
 206 static struct cpu cpu_devices[NR_CPUS];
 207
 208 int __init ppc_init(void)
 209 {
 210         int i;
 211
 212         /* clear the progress line */
 213         if ( ppc_md.progress ) ppc_md.progress("             ", 0xffff);
 214
 215         /* register CPU devices */
 216         for_each_possible_cpu(i)
 217                 register_cpu(&cpu_devices[i], i);
 218
 219         /* call platform init */
 220         if (ppc_md.init != NULL) {
 221                 ppc_md.init();
 222         }
 223         return 0;
 224 }
 225
 226 arch_initcall(ppc_init);
 227
 228 /* Warning, IO base is not yet inited */
 229 void __init setup_arch(char **cmdline_p)
 230 {
 231         *cmdline_p = cmd_line;
 232
 233         /* so udelay does something sensible, assume <= 1000 bogomips */
 234         loops_per_jiffy = 500000000 / HZ;
 235
 236         unflatten_device_tree();
 237         check_for_initrd();
 238
 239         if (ppc_md.init_early)
 240                 ppc_md.init_early();
 241
 242         find_legacy_serial_ports();
 243         finish_device_tree();
 244
 245         smp_setup_cpu_maps();
 246
 247 #ifdef CONFIG_XMON_DEFAULT
 248         xmon_init(1);
 249 #endif
 250         /* Register early console */
 251         register_early_udbg_console();
 252
 253 #if defined(CONFIG_KGDB)
 254         if (ppc_md.kgdb_map_scc)
 255                 ppc_md.kgdb_map_scc();
 256         set_debug_traps();
 257         if (strstr(cmd_line, "gdb")) {
 258                 if (ppc_md.progress)
 259                         ppc_md.progress("setup_arch: kgdb breakpoint", 0x4000);
 260                 printk("kgdb breakpoint activated\n");
 261                 breakpoint();
 262         }
 263 #endif
 264
 265         /*
 266          * Set cache line size based on type of cpu as a default.
 267          * Systems with OF can look in the properties on the cpu node(s)
 268          * for a possibly more accurate value.
 269          */
 270         if (cpu_has_feature(CPU_FTR_SPLIT_ID_CACHE)) {
 271                 dcache_bsize = cur_cpu_spec->dcache_bsize;
 272                 icache_bsize = cur_cpu_spec->icache_bsize;
 273                 ucache_bsize = 0;
 274         } else
 275                 ucache_bsize = dcache_bsize = icache_bsize
 276                         = cur_cpu_spec->dcache_bsize;
 277
 278         /* reboot on panic */
 279         panic_timeout = 180;
 280
 281         if (ppc_md.panic)
 282                 setup_panic();
 283
 284         init_mm.start_code = PAGE_OFFSET;
 285         init_mm.end_code = (unsigned long) _etext;
 286         init_mm.end_data = (unsigned long) _edata;
 287         init_mm.brk = klimit;
 288
 289         if (do_early_xmon)
 290                 debugger(NULL);
 291
 292         /* set up the bootmem stuff with available memory */
 293         do_init_bootmem();
 294         if ( ppc_md.progress ) ppc_md.progress("setup_arch: bootmem", 0x3eab);
 295
 296 #ifdef CONFIG_DUMMY_CONSOLE
 297         conswitchp = &dummy_con;
 298 #endif
 299
 300         ppc_md.setup_arch();
 301         if ( ppc_md.progress ) ppc_md.progress("arch: exit", 0x3eab);
 302
 303         paging_init();
 304 }