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 struct ide_machdep_calls ppc_ide_md;
  55
  56 int boot_cpuid;
  57 EXPORT_SYMBOL_GPL(boot_cpuid);
  58 int boot_cpuid_phys;
  59
  60 unsigned long ISA_DMA_THRESHOLD;
  61 unsigned int DMA_MODE_READ;
  62 unsigned int DMA_MODE_WRITE;
  63
  64 int have_of = 1;
  65
  66 #ifdef CONFIG_PPC_MULTIPLATFORM
  67 dev_t boot_dev;
  68 #endif /* CONFIG_PPC_MULTIPLATFORM */
  69
  70 #ifdef CONFIG_MAGIC_SYSRQ
  71 unsigned long SYSRQ_KEY = 0x54;
  72 #endif /* CONFIG_MAGIC_SYSRQ */
  73
  74 #ifdef CONFIG_VGA_CONSOLE
  75 unsigned long vgacon_remap_base;
  76 #endif
  77
  78 /*
  79  * These are used in binfmt_elf.c to put aux entries on the stack
  80  * for each elf executable being started.
  81  */
  82 int dcache_bsize;
  83 int icache_bsize;
  84 int ucache_bsize;
  85
  86 /*
  87  * We're called here very early in the boot.  We determine the machine
  88  * type and call the appropriate low-level setup functions.
  89  *  -- Cort <cort@fsmlabs.com>
  90  *
  91  * Note that the kernel may be running at an address which is different
  92  * from the address that it was linked at, so we must use RELOC/PTRRELOC
  93  * to access static data (including strings).  -- paulus
  94  */
  95 unsigned long __init early_init(unsigned long dt_ptr)
  96 {
  97         unsigned long offset = reloc_offset();
  98
  99         /* First zero the BSS -- use memset_io, some platforms don't have
 100          * caches on yet */
 101         memset_io((void __iomem *)PTRRELOC(&__bss_start), 0, _end - __bss_start);
 102
 103         /*
 104          * Identify the CPU type and fix up code sections
 105          * that depend on which cpu we have.
 106          */
 107         identify_cpu(offset, 0);
 108         do_cpu_ftr_fixups(offset);
 109
 110         return KERNELBASE + offset;
 111 }
 112
 113
 114 /*
 115  * Find out what kind of machine we're on and save any data we need
 116  * from the early boot process (devtree is copied on pmac by prom_init()).
 117  * This is called very early on the boot process, after a minimal
 118  * MMU environment has been set up but before MMU_init is called.
 119  */
 120 void __init machine_init(unsigned long dt_ptr, unsigned long phys)
 121 {
 122         /* If btext is enabled, we might have a BAT setup for early display,
 123          * thus we do enable some very basic udbg output
 124          */
 125 #ifdef CONFIG_BOOTX_TEXT
 126         udbg_putc = btext_drawchar;
 127 #endif
 128
 129         /* Do some early initialization based on the flat device tree */
 130         early_init_devtree(__va(dt_ptr));
 131
 132         probe_machine();
 133
 134 #ifdef CONFIG_6xx
 135         if (cpu_has_feature(CPU_FTR_CAN_DOZE) ||
 136             cpu_has_feature(CPU_FTR_CAN_NAP))
 137                 ppc_md.power_save = ppc6xx_idle;
 138 #endif
 139
 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 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 #ifdef CONFIG_GENERIC_NVRAM
 179
 180 /* Generic nvram hooks used by drivers/char/gen_nvram.c */
 181 unsigned char nvram_read_byte(int addr)
 182 {
 183         if (ppc_md.nvram_read_val)
 184                 return ppc_md.nvram_read_val(addr);
 185         return 0xff;
 186 }
 187 EXPORT_SYMBOL(nvram_read_byte);
 188
 189 void nvram_write_byte(unsigned char val, int addr)
 190 {
 191         if (ppc_md.nvram_write_val)
 192                 ppc_md.nvram_write_val(addr, val);
 193 }
 194 EXPORT_SYMBOL(nvram_write_byte);
 195
 196 void nvram_sync(void)
 197 {
 198         if (ppc_md.nvram_sync)
 199                 ppc_md.nvram_sync();
 200 }
 201 EXPORT_SYMBOL(nvram_sync);
 202
 203 #endif /* CONFIG_NVRAM */
 204
 205 static struct cpu cpu_devices[NR_CPUS];
 206
 207 int __init ppc_init(void)
 208 {
 209         int i;
 210
 211         /* clear the progress line */
 212         if ( ppc_md.progress ) ppc_md.progress("             ", 0xffff);
 213
 214         /* register CPU devices */
 215         for_each_possible_cpu(i)
 216                 register_cpu(&cpu_devices[i], i);
 217
 218         /* call platform init */
 219         if (ppc_md.init != NULL) {
 220                 ppc_md.init();
 221         }
 222         return 0;
 223 }
 224
 225 arch_initcall(ppc_init);
 226
 227 /* Warning, IO base is not yet inited */
 228 void __init setup_arch(char **cmdline_p)
 229 {
 230         *cmdline_p = cmd_line;
 231
 232         /* so udelay does something sensible, assume <= 1000 bogomips */
 233         loops_per_jiffy = 500000000 / HZ;
 234
 235         unflatten_device_tree();
 236         check_for_initrd();
 237
 238         if (ppc_md.init_early)
 239                 ppc_md.init_early();
 240
 241         find_legacy_serial_ports();
 242
 243         smp_setup_cpu_maps();
 244
 245 #ifdef CONFIG_XMON_DEFAULT
 246         xmon_init(1);
 247 #endif
 248         /* Register early console */
 249         register_early_udbg_console();
 250
 251 #if defined(CONFIG_KGDB)
 252         if (ppc_md.kgdb_map_scc)
 253                 ppc_md.kgdb_map_scc();
 254         set_debug_traps();
 255         if (strstr(cmd_line, "gdb")) {
 256                 if (ppc_md.progress)
 257                         ppc_md.progress("setup_arch: kgdb breakpoint", 0x4000);
 258                 printk("kgdb breakpoint activated\n");
 259                 breakpoint();
 260         }
 261 #endif
 262
 263         /*
 264          * Set cache line size based on type of cpu as a default.
 265          * Systems with OF can look in the properties on the cpu node(s)
 266          * for a possibly more accurate value.
 267          */
 268         if (cpu_has_feature(CPU_FTR_SPLIT_ID_CACHE)) {
 269                 dcache_bsize = cur_cpu_spec->dcache_bsize;
 270                 icache_bsize = cur_cpu_spec->icache_bsize;
 271                 ucache_bsize = 0;
 272         } else
 273                 ucache_bsize = dcache_bsize = icache_bsize
 274                         = cur_cpu_spec->dcache_bsize;
 275
 276         /* reboot on panic */
 277         panic_timeout = 180;
 278
 279         if (ppc_md.panic)
 280                 setup_panic();
 281
 282         init_mm.start_code = PAGE_OFFSET;
 283         init_mm.end_code = (unsigned long) _etext;
 284         init_mm.end_data = (unsigned long) _edata;
 285         init_mm.brk = klimit;
 286
 287         if (do_early_xmon)
 288                 debugger(NULL);
 289
 290         /* set up the bootmem stuff with available memory */
 291         do_init_bootmem();
 292         if ( ppc_md.progress ) ppc_md.progress("setup_arch: bootmem", 0x3eab);
 293
 294 #ifdef CONFIG_DUMMY_CONSOLE
 295         conswitchp = &dummy_con;
 296 #endif
 297
 298         ppc_md.setup_arch();
 299         if ( ppc_md.progress ) ppc_md.progress("arch: exit", 0x3eab);
 300
 301         paging_init();
 302 }