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