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 platform_init(void);
  54 extern void bootx_init(unsigned long r4, unsigned long phys);
  55
  56 boot_infos_t *boot_infos;
  57 struct ide_machdep_calls ppc_ide_md;
  58
  59 int boot_cpuid;
  60 EXPORT_SYMBOL_GPL(boot_cpuid);
  61 int boot_cpuid_phys;
  62
  63 unsigned long ISA_DMA_THRESHOLD;
  64 unsigned int DMA_MODE_READ;
  65 unsigned int DMA_MODE_WRITE;
  66
  67 int have_of = 1;
  68
  69 #ifdef CONFIG_PPC_MULTIPLATFORM
  70 dev_t boot_dev;
  71 #endif /* CONFIG_PPC_MULTIPLATFORM */
  72
  73 #ifdef CONFIG_MAGIC_SYSRQ
  74 unsigned long SYSRQ_KEY = 0x54;
  75 #endif /* CONFIG_MAGIC_SYSRQ */
  76
  77 #ifdef CONFIG_VGA_CONSOLE
  78 unsigned long vgacon_remap_base;
  79 #endif
  80
  81 /*
  82  * These are used in binfmt_elf.c to put aux entries on the stack
  83  * for each elf executable being started.
  84  */
  85 int dcache_bsize;
  86 int icache_bsize;
  87 int ucache_bsize;
  88
  89 /*
  90  * We're called here very early in the boot.  We determine the machine
  91  * type and call the appropriate low-level setup functions.
  92  *  -- Cort <cort@fsmlabs.com>
  93  *
  94  * Note that the kernel may be running at an address which is different
  95  * from the address that it was linked at, so we must use RELOC/PTRRELOC
  96  * to access static data (including strings).  -- paulus
  97  */
  98 unsigned long __init early_init(unsigned long dt_ptr)
  99 {
 100         unsigned long offset = reloc_offset();
 101
 102         /* First zero the BSS -- use memset_io, some platforms don't have
 103          * caches on yet */
 104         memset_io((void __iomem *)PTRRELOC(&__bss_start), 0, _end - __bss_start);
 105
 106         /*
 107          * Identify the CPU type and fix up code sections
 108          * that depend on which cpu we have.
 109          */
 110         identify_cpu(offset, 0);
 111         do_cpu_ftr_fixups(offset);
 112
 113         return KERNELBASE + offset;
 114 }
 115
 116
 117 /*
 118  * Find out what kind of machine we're on and save any data we need
 119  * from the early boot process (devtree is copied on pmac by prom_init()).
 120  * This is called very early on the boot process, after a minimal
 121  * MMU environment has been set up but before MMU_init is called.
 122  */
 123 void __init machine_init(unsigned long dt_ptr, unsigned long phys)
 124 {
 125         /* If btext is enabled, we might have a BAT setup for early display,
 126          * thus we do enable some very basic udbg output
 127          */
 128 #ifdef CONFIG_BOOTX_TEXT
 129         udbg_putc = btext_drawchar;
 130 #endif
 131
 132         /* Do some early initialization based on the flat device tree */
 133         early_init_devtree(__va(dt_ptr));
 134
 135         /* Check default command line */
 136 #ifdef CONFIG_CMDLINE
 137         if (cmd_line[0] == 0)
 138                 strlcpy(cmd_line, CONFIG_CMDLINE, sizeof(cmd_line));
 139 #endif /* CONFIG_CMDLINE */
 140
 141 #ifdef CONFIG_PPC_MULTIPLATFORM
 142         probe_machine();
 143 #else
 144         /* Base init based on machine type. Obsoloete, please kill ! */
 145         platform_init();
 146 #endif
 147
 148 #ifdef CONFIG_6xx
 149         if (cpu_has_feature(CPU_FTR_CAN_DOZE) ||
 150             cpu_has_feature(CPU_FTR_CAN_NAP))
 151                 ppc_md.power_save = ppc6xx_idle;
 152 #endif
 153
 154         if (ppc_md.progress)
 155                 ppc_md.progress("id mach(): done", 0x200);
 156 }
 157
 158 #ifdef CONFIG_BOOKE_WDT
 159 /* Checks wdt=x and wdt_period=xx command-line option */
 160 int __init early_parse_wdt(char *p)
 161 {
 162         if (p && strncmp(p, "0", 1) != 0)
 163                booke_wdt_enabled = 1;
 164
 165         return 0;
 166 }
 167 early_param("wdt", early_parse_wdt);
 168
 169 int __init early_parse_wdt_period (char *p)
 170 {
 171         if (p)
 172                 booke_wdt_period = simple_strtoul(p, NULL, 0);
 173
 174         return 0;
 175 }
 176 early_param("wdt_period", early_parse_wdt_period);
 177 #endif  /* CONFIG_BOOKE_WDT */
 178
 179 /* Checks "l2cr=xxxx" command-line option */
 180 int __init ppc_setup_l2cr(char *str)
 181 {
 182         if (cpu_has_feature(CPU_FTR_L2CR)) {
 183                 unsigned long val = simple_strtoul(str, NULL, 0);
 184                 printk(KERN_INFO "l2cr set to %lx\n", val);
 185                 _set_L2CR(0);           /* force invalidate by disable cache */
 186                 _set_L2CR(val);         /* and enable it */
 187         }
 188         return 1;
 189 }
 190 __setup("l2cr=", ppc_setup_l2cr);
 191
 192 #ifdef CONFIG_GENERIC_NVRAM
 193
 194 /* Generic nvram hooks used by drivers/char/gen_nvram.c */
 195 unsigned char nvram_read_byte(int addr)
 196 {
 197         if (ppc_md.nvram_read_val)
 198                 return ppc_md.nvram_read_val(addr);
 199         return 0xff;
 200 }
 201 EXPORT_SYMBOL(nvram_read_byte);
 202
 203 void nvram_write_byte(unsigned char val, int addr)
 204 {
 205         if (ppc_md.nvram_write_val)
 206                 ppc_md.nvram_write_val(addr, val);
 207 }
 208 EXPORT_SYMBOL(nvram_write_byte);
 209
 210 void nvram_sync(void)
 211 {
 212         if (ppc_md.nvram_sync)
 213                 ppc_md.nvram_sync();
 214 }
 215 EXPORT_SYMBOL(nvram_sync);
 216
 217 #endif /* CONFIG_NVRAM */
 218
 219 static struct cpu cpu_devices[NR_CPUS];
 220
 221 int __init ppc_init(void)
 222 {
 223         int i;
 224
 225         /* clear the progress line */
 226         if ( ppc_md.progress ) ppc_md.progress("             ", 0xffff);
 227
 228         /* register CPU devices */
 229         for_each_cpu(i)
 230                 register_cpu(&cpu_devices[i], i, NULL);
 231
 232         /* call platform init */
 233         if (ppc_md.init != NULL) {
 234                 ppc_md.init();
 235         }
 236         return 0;
 237 }
 238
 239 arch_initcall(ppc_init);
 240
 241 /* Warning, IO base is not yet inited */
 242 void __init setup_arch(char **cmdline_p)
 243 {
 244         extern void do_init_bootmem(void);
 245
 246         /* so udelay does something sensible, assume <= 1000 bogomips */
 247         loops_per_jiffy = 500000000 / HZ;
 248
 249         unflatten_device_tree();
 250         check_for_initrd();
 251
 252         if (ppc_md.init_early)
 253                 ppc_md.init_early();
 254
 255         find_legacy_serial_ports();
 256         finish_device_tree();
 257
 258         smp_setup_cpu_maps();
 259
 260 #ifdef CONFIG_XMON_DEFAULT
 261         xmon_init(1);
 262 #endif
 263         /* Register early console */
 264         register_early_udbg_console();
 265
 266 #if defined(CONFIG_KGDB)
 267         if (ppc_md.kgdb_map_scc)
 268                 ppc_md.kgdb_map_scc();
 269         set_debug_traps();
 270         if (strstr(cmd_line, "gdb")) {
 271                 if (ppc_md.progress)
 272                         ppc_md.progress("setup_arch: kgdb breakpoint", 0x4000);
 273                 printk("kgdb breakpoint activated\n");
 274                 breakpoint();
 275         }
 276 #endif
 277
 278         /*
 279          * Set cache line size based on type of cpu as a default.
 280          * Systems with OF can look in the properties on the cpu node(s)
 281          * for a possibly more accurate value.
 282          */
 283         if (cpu_has_feature(CPU_FTR_SPLIT_ID_CACHE)) {
 284                 dcache_bsize = cur_cpu_spec->dcache_bsize;
 285                 icache_bsize = cur_cpu_spec->icache_bsize;
 286                 ucache_bsize = 0;
 287         } else
 288                 ucache_bsize = dcache_bsize = icache_bsize
 289                         = cur_cpu_spec->dcache_bsize;
 290
 291         /* reboot on panic */
 292         panic_timeout = 180;
 293
 294         init_mm.start_code = PAGE_OFFSET;
 295         init_mm.end_code = (unsigned long) _etext;
 296         init_mm.end_data = (unsigned long) _edata;
 297         init_mm.brk = klimit;
 298
 299         /* Save unparsed command line copy for /proc/cmdline */
 300         strlcpy(saved_command_line, cmd_line, COMMAND_LINE_SIZE);
 301         *cmdline_p = cmd_line;
 302
 303         parse_early_param();
 304
 305         /* set up the bootmem stuff with available memory */
 306         do_init_bootmem();
 307         if ( ppc_md.progress ) ppc_md.progress("setup_arch: bootmem", 0x3eab);
 308
 309 #ifdef CONFIG_DUMMY_CONSOLE
 310         conswitchp = &dummy_con;
 311 #endif
 312
 313         ppc_md.setup_arch();
 314         if ( ppc_md.progress ) ppc_md.progress("arch: exit", 0x3eab);
 315
 316         paging_init();
 317 }