arch/powerpc/kernel/setup_32.c

   1 /*
   2  * Common prep/pmac/chrp boot and setup code.
   3  */
   4
   5 #include <linux/config.h>
   6 #include <linux/module.h>
   7 #include <linux/string.h>
   8 #include <linux/sched.h>
   9 #include <linux/init.h>
  10 #include <linux/kernel.h>
  11 #include <linux/reboot.h>
  12 #include <linux/delay.h>
  13 #include <linux/initrd.h>
  14 #include <linux/ide.h>
  15 #include <linux/tty.h>
  16 #include <linux/bootmem.h>
  17 #include <linux/seq_file.h>
  18 #include <linux/root_dev.h>
  19 #include <linux/cpu.h>
  20 #include <linux/console.h>
  21
  22 #include <asm/residual.h>
  23 #include <asm/io.h>
  24 #include <asm/prom.h>
  25 #include <asm/processor.h>
  26 #include <asm/pgtable.h>
  27 #include <asm/setup.h>
  28 #include <asm/amigappc.h>
  29 #include <asm/smp.h>
  30 #include <asm/elf.h>
  31 #include <asm/cputable.h>
  32 #include <asm/bootx.h>
  33 #include <asm/btext.h>
  34 #include <asm/machdep.h>
  35 #include <asm/uaccess.h>
  36 #include <asm/system.h>
  37 #include <asm/pmac_feature.h>
  38 #include <asm/sections.h>
  39 #include <asm/nvram.h>
  40 #include <asm/xmon.h>
  41 #include <asm/time.h>
  42 #include <asm/serial.h>
  43 #include <asm/udbg.h>
  44
  45 #include "setup.h"
  46
  47 #define DBG(fmt...)
  48
  49 #if defined CONFIG_KGDB
  50 #include <asm/kgdb.h>
  51 #endif
  52
  53 extern void bootx_init(unsigned long r4, unsigned long phys);
  54
  55 boot_infos_t *boot_infos;
  56 struct ide_machdep_calls ppc_ide_md;
  57
  58 int boot_cpuid;
  59 EXPORT_SYMBOL_GPL(boot_cpuid);
  60 int boot_cpuid_phys;
  61
  62 unsigned long ISA_DMA_THRESHOLD;
  63 unsigned int DMA_MODE_READ;
  64 unsigned int DMA_MODE_WRITE;
  65
  66 int have_of = 1;
  67
  68 #ifdef CONFIG_PPC_MULTIPLATFORM
  69 dev_t boot_dev;
  70 #endif /* CONFIG_PPC_MULTIPLATFORM */
  71
  72 #ifdef CONFIG_MAGIC_SYSRQ
  73 unsigned long SYSRQ_KEY = 0x54;
  74 #endif /* CONFIG_MAGIC_SYSRQ */
  75
  76 #ifdef CONFIG_VGA_CONSOLE
  77 unsigned long vgacon_remap_base;
  78 #endif
  79
  80 /*
  81  * These are used in binfmt_elf.c to put aux entries on the stack
  82  * for each elf executable being started.
  83  */
  84 int dcache_bsize;
  85 int icache_bsize;
  86 int ucache_bsize;
  87
  88 /*
  89  * We're called here very early in the boot.  We determine the machine
  90  * type and call the appropriate low-level setup functions.
  91  *  -- Cort <cort@fsmlabs.com>
  92  *
  93  * Note that the kernel may be running at an address which is different
  94  * from the address that it was linked at, so we must use RELOC/PTRRELOC
  95  * to access static data (including strings).  -- paulus
  96  */
  97 unsigned long __init early_init(unsigned long dt_ptr)
  98 {
  99         unsigned long offset = reloc_offset();
 100
 101         /* First zero the BSS -- use memset_io, some platforms don't have
 102          * caches on yet */
 103         memset_io((void __iomem *)PTRRELOC(&__bss_start), 0, _end - __bss_start);
 104
 105         /*
 106          * Identify the CPU type and fix up code sections
 107          * that depend on which cpu we have.
 108          */
 109         identify_cpu(offset, 0);
 110         do_cpu_ftr_fixups(offset);
 111
 112         return KERNELBASE + offset;
 113 }
 114
 115
 116 /*
 117  * Find out what kind of machine we're on and save any data we need
 118  * from the early boot process (devtree is copied on pmac by prom_init()).
 119  * This is called very early on the boot process, after a minimal
 120  * MMU environment has been set up but before MMU_init is called.
 121  */
 122 void __init machine_init(unsigned long dt_ptr, unsigned long phys)
 123 {
 124         /* If btext is enabled, we might have a BAT setup for early display,
 125          * thus we do enable some very basic udbg output
 126          */
 127 #ifdef CONFIG_BOOTX_TEXT
 128         udbg_putc = btext_drawchar;
 129 #endif
 130
 131         /* Do some early initialization based on the flat device tree */
 132         early_init_devtree(__va(dt_ptr));
 133
 134         probe_machine();
 135
 136 #ifdef CONFIG_6xx
 137         if (cpu_has_feature(CPU_FTR_CAN_DOZE) ||
 138             cpu_has_feature(CPU_FTR_CAN_NAP))
 139                 ppc_md.power_save = ppc6xx_idle;
 140 #endif
 141
 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 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 #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 struct cpu cpu_devices[NR_CPUS];
 208
 209 int __init ppc_init(void)
 210 {
 211         int i;
 212
 213         /* clear the progress line */
 214         if ( ppc_md.progress ) ppc_md.progress("             ", 0xffff);
 215
 216         /* register CPU devices */
 217         for_each_possible_cpu(i)
 218                 register_cpu(&cpu_devices[i], i, NULL);
 219
 220         /* call platform init */
 221         if (ppc_md.init != NULL) {
 222                 ppc_md.init();
 223         }
 224         return 0;
 225 }
 226
 227 arch_initcall(ppc_init);
 228
 229 /* Warning, IO base is not yet inited */
 230 void __init setup_arch(char **cmdline_p)
 231 {
 232         *cmdline_p = cmd_line;
 233
 234         /* so udelay does something sensible, assume <= 1000 bogomips */
 235         loops_per_jiffy = 500000000 / HZ;
 236
 237         unflatten_device_tree();
 238         check_for_initrd();
 239
 240         if (ppc_md.init_early)
 241                 ppc_md.init_early();
 242
 243         find_legacy_serial_ports();
 244         finish_device_tree();
 245
 246         smp_setup_cpu_maps();
 247
 248 #ifdef CONFIG_XMON_DEFAULT
 249         xmon_init(1);
 250 #endif
 251         /* Register early console */
 252         register_early_udbg_console();
 253
 254 #if defined(CONFIG_KGDB)
 255         if (ppc_md.kgdb_map_scc)
 256                 ppc_md.kgdb_map_scc();
 257         set_debug_traps();
 258         if (strstr(cmd_line, "gdb")) {
 259                 if (ppc_md.progress)
 260                         ppc_md.progress("setup_arch: kgdb breakpoint", 0x4000);
 261                 printk("kgdb breakpoint activated\n");
 262                 breakpoint();
 263         }
 264 #endif
 265
 266         /*
 267          * Set cache line size based on type of cpu as a default.
 268          * Systems with OF can look in the properties on the cpu node(s)
 269          * for a possibly more accurate value.
 270          */
 271         if (cpu_has_feature(CPU_FTR_SPLIT_ID_CACHE)) {
 272                 dcache_bsize = cur_cpu_spec->dcache_bsize;
 273                 icache_bsize = cur_cpu_spec->icache_bsize;
 274                 ucache_bsize = 0;
 275         } else
 276                 ucache_bsize = dcache_bsize = icache_bsize
 277                         = cur_cpu_spec->dcache_bsize;
 278
 279         /* reboot on panic */
 280         panic_timeout = 180;
 281
 282         if (ppc_md.panic)
 283                 setup_panic();
 284
 285         init_mm.start_code = PAGE_OFFSET;
 286         init_mm.end_code = (unsigned long) _etext;
 287         init_mm.end_data = (unsigned long) _edata;
 288         init_mm.brk = klimit;
 289
 290         if (do_early_xmon)
 291                 debugger(NULL);
 292
 293         /* set up the bootmem stuff with available memory */
 294         do_init_bootmem();
 295         if ( ppc_md.progress ) ppc_md.progress("setup_arch: bootmem", 0x3eab);
 296
 297 #ifdef CONFIG_DUMMY_CONSOLE
 298         conswitchp = &dummy_con;
 299 #endif
 300
 301         ppc_md.setup_arch();
 302         if ( ppc_md.progress ) ppc_md.progress("arch: exit", 0x3eab);
 303
 304         paging_init();
 305 }