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         /* Check default command line */
 135 #ifdef CONFIG_CMDLINE
 136         if (cmd_line[0] == 0)
 137                 strlcpy(cmd_line, CONFIG_CMDLINE, sizeof(cmd_line));
 138 #endif /* CONFIG_CMDLINE */
 139
 140         probe_machine();
 141
 142 #ifdef CONFIG_6xx
 143         if (cpu_has_feature(CPU_FTR_CAN_DOZE) ||
 144             cpu_has_feature(CPU_FTR_CAN_NAP))
 145                 ppc_md.power_save = ppc6xx_idle;
 146 #endif
 147
 148         if (ppc_md.progress)
 149                 ppc_md.progress("id mach(): done", 0x200);
 150 }
 151
 152 #ifdef CONFIG_BOOKE_WDT
 153 /* Checks wdt=x and wdt_period=xx command-line option */
 154 int __init early_parse_wdt(char *p)
 155 {
 156         if (p && strncmp(p, "0", 1) != 0)
 157                booke_wdt_enabled = 1;
 158
 159         return 0;
 160 }
 161 early_param("wdt", early_parse_wdt);
 162
 163 int __init early_parse_wdt_period (char *p)
 164 {
 165         if (p)
 166                 booke_wdt_period = simple_strtoul(p, NULL, 0);
 167
 168         return 0;
 169 }
 170 early_param("wdt_period", early_parse_wdt_period);
 171 #endif  /* CONFIG_BOOKE_WDT */
 172
 173 /* Checks "l2cr=xxxx" command-line option */
 174 int __init ppc_setup_l2cr(char *str)
 175 {
 176         if (cpu_has_feature(CPU_FTR_L2CR)) {
 177                 unsigned long val = simple_strtoul(str, NULL, 0);
 178                 printk(KERN_INFO "l2cr set to %lx\n", val);
 179                 _set_L2CR(0);           /* force invalidate by disable cache */
 180                 _set_L2CR(val);         /* and enable it */
 181         }
 182         return 1;
 183 }
 184 __setup("l2cr=", ppc_setup_l2cr);
 185
 186 #ifdef CONFIG_GENERIC_NVRAM
 187
 188 /* Generic nvram hooks used by drivers/char/gen_nvram.c */
 189 unsigned char nvram_read_byte(int addr)
 190 {
 191         if (ppc_md.nvram_read_val)
 192                 return ppc_md.nvram_read_val(addr);
 193         return 0xff;
 194 }
 195 EXPORT_SYMBOL(nvram_read_byte);
 196
 197 void nvram_write_byte(unsigned char val, int addr)
 198 {
 199         if (ppc_md.nvram_write_val)
 200                 ppc_md.nvram_write_val(addr, val);
 201 }
 202 EXPORT_SYMBOL(nvram_write_byte);
 203
 204 void nvram_sync(void)
 205 {
 206         if (ppc_md.nvram_sync)
 207                 ppc_md.nvram_sync();
 208 }
 209 EXPORT_SYMBOL(nvram_sync);
 210
 211 #endif /* CONFIG_NVRAM */
 212
 213 static struct cpu cpu_devices[NR_CPUS];
 214
 215 int __init ppc_init(void)
 216 {
 217         int i;
 218
 219         /* clear the progress line */
 220         if ( ppc_md.progress ) ppc_md.progress("             ", 0xffff);
 221
 222         /* register CPU devices */
 223         for_each_possible_cpu(i)
 224                 register_cpu(&cpu_devices[i], i, NULL);
 225
 226         /* call platform init */
 227         if (ppc_md.init != NULL) {
 228                 ppc_md.init();
 229         }
 230         return 0;
 231 }
 232
 233 arch_initcall(ppc_init);
 234
 235 /* Warning, IO base is not yet inited */
 236 void __init setup_arch(char **cmdline_p)
 237 {
 238         extern void do_init_bootmem(void);
 239
 240         /* so udelay does something sensible, assume <= 1000 bogomips */
 241         loops_per_jiffy = 500000000 / HZ;
 242
 243         unflatten_device_tree();
 244         check_for_initrd();
 245
 246         if (ppc_md.init_early)
 247                 ppc_md.init_early();
 248
 249         find_legacy_serial_ports();
 250         finish_device_tree();
 251
 252         smp_setup_cpu_maps();
 253
 254 #ifdef CONFIG_XMON_DEFAULT
 255         xmon_init(1);
 256 #endif
 257         /* Register early console */
 258         register_early_udbg_console();
 259
 260 #if defined(CONFIG_KGDB)
 261         if (ppc_md.kgdb_map_scc)
 262                 ppc_md.kgdb_map_scc();
 263         set_debug_traps();
 264         if (strstr(cmd_line, "gdb")) {
 265                 if (ppc_md.progress)
 266                         ppc_md.progress("setup_arch: kgdb breakpoint", 0x4000);
 267                 printk("kgdb breakpoint activated\n");
 268                 breakpoint();
 269         }
 270 #endif
 271
 272         /*
 273          * Set cache line size based on type of cpu as a default.
 274          * Systems with OF can look in the properties on the cpu node(s)
 275          * for a possibly more accurate value.
 276          */
 277         if (cpu_has_feature(CPU_FTR_SPLIT_ID_CACHE)) {
 278                 dcache_bsize = cur_cpu_spec->dcache_bsize;
 279                 icache_bsize = cur_cpu_spec->icache_bsize;
 280                 ucache_bsize = 0;
 281         } else
 282                 ucache_bsize = dcache_bsize = icache_bsize
 283                         = cur_cpu_spec->dcache_bsize;
 284
 285         /* reboot on panic */
 286         panic_timeout = 180;
 287
 288         init_mm.start_code = PAGE_OFFSET;
 289         init_mm.end_code = (unsigned long) _etext;
 290         init_mm.end_data = (unsigned long) _edata;
 291         init_mm.brk = klimit;
 292
 293         /* Save unparsed command line copy for /proc/cmdline */
 294         strlcpy(saved_command_line, cmd_line, COMMAND_LINE_SIZE);
 295         *cmdline_p = cmd_line;
 296
 297         parse_early_param();
 298
 299         /* set up the bootmem stuff with available memory */
 300         do_init_bootmem();
 301         if ( ppc_md.progress ) ppc_md.progress("setup_arch: bootmem", 0x3eab);
 302
 303 #ifdef CONFIG_DUMMY_CONSOLE
 304         conswitchp = &dummy_con;
 305 #endif
 306
 307         ppc_md.setup_arch();
 308         if ( ppc_md.progress ) ppc_md.progress("arch: exit", 0x3eab);
 309
 310         paging_init();
 311 }