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 43 #define DBG(fmt...) 44 45 #if defined CONFIG_KGDB 46 #include <asm/kgdb.h> 47 #endif 48 49 extern void platform_init(void); 50 extern void bootx_init(unsigned long r4, unsigned long phys); 51 52 extern void ppc6xx_idle(void); 53 extern void power4_idle(void); 54 55 boot_infos_t *boot_infos; 56 struct ide_machdep_calls ppc_ide_md; 57 58 /* XXX should go elsewhere */ 59 int __irq_offset_value; 60 EXPORT_SYMBOL(__irq_offset_value); 61 62 int boot_cpuid; 63 EXPORT_SYMBOL_GPL(boot_cpuid); 64 int boot_cpuid_phys; 65 66 unsigned long ISA_DMA_THRESHOLD; 67 unsigned int DMA_MODE_READ; 68 unsigned int DMA_MODE_WRITE; 69 70 int have_of = 1; 71 72 #ifdef CONFIG_PPC_MULTIPLATFORM 73 int _machine = 0; 74 75 extern void prep_init(void); 76 extern void pmac_init(void); 77 extern void chrp_init(void); 78 79 dev_t boot_dev; 80 #endif /* CONFIG_PPC_MULTIPLATFORM */ 81 82 #ifdef CONFIG_MAGIC_SYSRQ 83 unsigned long SYSRQ_KEY = 0x54; 84 #endif /* CONFIG_MAGIC_SYSRQ */ 85 86 #ifdef CONFIG_VGA_CONSOLE 87 unsigned long vgacon_remap_base; 88 #endif 89 90 struct machdep_calls ppc_md; 91 EXPORT_SYMBOL(ppc_md); 92 93 /* 94 * These are used in binfmt_elf.c to put aux entries on the stack 95 * for each elf executable being started. 96 */ 97 int dcache_bsize; 98 int icache_bsize; 99 int ucache_bsize; 100 101 /* 102 * We're called here very early in the boot. We determine the machine 103 * type and call the appropriate low-level setup functions. 104 * -- Cort <cort@fsmlabs.com> 105 * 106 * Note that the kernel may be running at an address which is different 107 * from the address that it was linked at, so we must use RELOC/PTRRELOC 108 * to access static data (including strings). -- paulus 109 */ 110 unsigned long __init early_init(unsigned long dt_ptr) 111 { 112 unsigned long offset = reloc_offset(); 113 114 /* First zero the BSS -- use memset_io, some platforms don't have 115 * caches on yet */ 116 memset_io(PTRRELOC(&__bss_start), 0, _end - __bss_start); 117 118 /* 119 * Identify the CPU type and fix up code sections 120 * that depend on which cpu we have. 121 */ 122 identify_cpu(offset, 0); 123 do_cpu_ftr_fixups(offset); 124 125 return KERNELBASE + offset; 126 } 127 128 #ifdef CONFIG_PPC_MULTIPLATFORM 129 /* 130 * The PPC_MULTIPLATFORM version of platform_init... 131 */ 132 void __init platform_init(void) 133 { 134 /* if we didn't get any bootinfo telling us what we are... */ 135 if (_machine == 0) { 136 /* prep boot loader tells us if we're prep or not */ 137 if ( *(unsigned long *)(KERNELBASE) == (0xdeadc0de) ) 138 _machine = _MACH_prep; 139 } 140 141 #ifdef CONFIG_PPC_PREP 142 /* not much more to do here, if prep */ 143 if (_machine == _MACH_prep) { 144 prep_init(); 145 return; 146 } 147 #endif 148 149 #ifdef CONFIG_ADB 150 if (strstr(cmd_line, "adb_sync")) { 151 extern int __adb_probe_sync; 152 __adb_probe_sync = 1; 153 } 154 #endif /* CONFIG_ADB */ 155 156 switch (_machine) { 157 #ifdef CONFIG_PPC_PMAC 158 case _MACH_Pmac: 159 pmac_init(); 160 break; 161 #endif 162 #ifdef CONFIG_PPC_CHRP 163 case _MACH_chrp: 164 chrp_init(); 165 break; 166 #endif 167 } 168 } 169 #endif 170 171 /* 172 * Find out what kind of machine we're on and save any data we need 173 * from the early boot process (devtree is copied on pmac by prom_init()). 174 * This is called very early on the boot process, after a minimal 175 * MMU environment has been set up but before MMU_init is called. 176 */ 177 void __init machine_init(unsigned long dt_ptr, unsigned long phys) 178 { 179 early_init_devtree(__va(dt_ptr)); 180 181 #ifdef CONFIG_CMDLINE 182 strlcpy(cmd_line, CONFIG_CMDLINE, sizeof(cmd_line)); 183 #endif /* CONFIG_CMDLINE */ 184 185 platform_init(); 186 187 #ifdef CONFIG_6xx 188 ppc_md.power_save = ppc6xx_idle; 189 #endif 190 191 if (ppc_md.progress) 192 ppc_md.progress("id mach(): done", 0x200); 193 } 194 195 #ifdef CONFIG_BOOKE_WDT 196 /* Checks wdt=x and wdt_period=xx command-line option */ 197 int __init early_parse_wdt(char *p) 198 { 199 if (p && strncmp(p, "0", 1) != 0) 200 booke_wdt_enabled = 1; 201 202 return 0; 203 } 204 early_param("wdt", early_parse_wdt); 205 206 int __init early_parse_wdt_period (char *p) 207 { 208 if (p) 209 booke_wdt_period = simple_strtoul(p, NULL, 0); 210 211 return 0; 212 } 213 early_param("wdt_period", early_parse_wdt_period); 214 #endif /* CONFIG_BOOKE_WDT */ 215 216 /* Checks "l2cr=xxxx" command-line option */ 217 int __init ppc_setup_l2cr(char *str) 218 { 219 if (cpu_has_feature(CPU_FTR_L2CR)) { 220 unsigned long val = simple_strtoul(str, NULL, 0); 221 printk(KERN_INFO "l2cr set to %lx\n", val); 222 _set_L2CR(0); /* force invalidate by disable cache */ 223 _set_L2CR(val); /* and enable it */ 224 } 225 return 1; 226 } 227 __setup("l2cr=", ppc_setup_l2cr); 228 229 #ifdef CONFIG_GENERIC_NVRAM 230 231 /* Generic nvram hooks used by drivers/char/gen_nvram.c */ 232 unsigned char nvram_read_byte(int addr) 233 { 234 if (ppc_md.nvram_read_val) 235 return ppc_md.nvram_read_val(addr); 236 return 0xff; 237 } 238 EXPORT_SYMBOL(nvram_read_byte); 239 240 void nvram_write_byte(unsigned char val, int addr) 241 { 242 if (ppc_md.nvram_write_val) 243 ppc_md.nvram_write_val(addr, val); 244 } 245 EXPORT_SYMBOL(nvram_write_byte); 246 247 void nvram_sync(void) 248 { 249 if (ppc_md.nvram_sync) 250 ppc_md.nvram_sync(); 251 } 252 EXPORT_SYMBOL(nvram_sync); 253 254 #endif /* CONFIG_NVRAM */ 255 256 static struct cpu cpu_devices[NR_CPUS]; 257 258 int __init ppc_init(void) 259 { 260 int i; 261 262 /* clear the progress line */ 263 if ( ppc_md.progress ) ppc_md.progress(" ", 0xffff); 264 265 /* register CPU devices */ 266 for (i = 0; i < NR_CPUS; i++) 267 if (cpu_possible(i)) 268 register_cpu(&cpu_devices[i], i, NULL); 269 270 /* call platform init */ 271 if (ppc_md.init != NULL) { 272 ppc_md.init(); 273 } 274 return 0; 275 } 276 277 arch_initcall(ppc_init); 278 279 /* Warning, IO base is not yet inited */ 280 void __init setup_arch(char **cmdline_p) 281 { 282 extern char *klimit; 283 extern void do_init_bootmem(void); 284 285 /* so udelay does something sensible, assume <= 1000 bogomips */ 286 loops_per_jiffy = 500000000 / HZ; 287 288 unflatten_device_tree(); 289 finish_device_tree(); 290 291 smp_setup_cpu_maps(); 292 293 #ifdef CONFIG_BOOTX_TEXT 294 init_boot_display(); 295 #endif 296 297 #ifdef CONFIG_PPC_PMAC 298 /* This could be called "early setup arch", it must be done 299 * now because xmon need it 300 */ 301 if (_machine == _MACH_Pmac) 302 pmac_feature_init(); /* New cool way */ 303 #endif 304 305 #ifdef CONFIG_XMON 306 xmon_map_scc(); 307 if (strstr(cmd_line, "xmon")) { 308 xmon_init(1); 309 debugger(NULL); 310 } 311 #endif /* CONFIG_XMON */ 312 if ( ppc_md.progress ) ppc_md.progress("setup_arch: enter", 0x3eab); 313 314 #if defined(CONFIG_KGDB) 315 if (ppc_md.kgdb_map_scc) 316 ppc_md.kgdb_map_scc(); 317 set_debug_traps(); 318 if (strstr(cmd_line, "gdb")) { 319 if (ppc_md.progress) 320 ppc_md.progress("setup_arch: kgdb breakpoint", 0x4000); 321 printk("kgdb breakpoint activated\n"); 322 breakpoint(); 323 } 324 #endif 325 326 /* 327 * Set cache line size based on type of cpu as a default. 328 * Systems with OF can look in the properties on the cpu node(s) 329 * for a possibly more accurate value. 330 */ 331 if (cpu_has_feature(CPU_FTR_SPLIT_ID_CACHE)) { 332 dcache_bsize = cur_cpu_spec->dcache_bsize; 333 icache_bsize = cur_cpu_spec->icache_bsize; 334 ucache_bsize = 0; 335 } else 336 ucache_bsize = dcache_bsize = icache_bsize 337 = cur_cpu_spec->dcache_bsize; 338 339 /* reboot on panic */ 340 panic_timeout = 180; 341 342 init_mm.start_code = PAGE_OFFSET; 343 init_mm.end_code = (unsigned long) _etext; 344 init_mm.end_data = (unsigned long) _edata; 345 init_mm.brk = (unsigned long) klimit; 346 347 /* Save unparsed command line copy for /proc/cmdline */ 348 strlcpy(saved_command_line, cmd_line, COMMAND_LINE_SIZE); 349 *cmdline_p = cmd_line; 350 351 parse_early_param(); 352 353 /* set up the bootmem stuff with available memory */ 354 do_init_bootmem(); 355 if ( ppc_md.progress ) ppc_md.progress("setup_arch: bootmem", 0x3eab); 356 357 #ifdef CONFIG_PPC_OCP 358 /* Initialize OCP device list */ 359 ocp_early_init(); 360 if ( ppc_md.progress ) ppc_md.progress("ocp: exit", 0x3eab); 361 #endif 362 363 #ifdef CONFIG_DUMMY_CONSOLE 364 conswitchp = &dummy_con; 365 #endif 366 367 ppc_md.setup_arch(); 368 if ( ppc_md.progress ) ppc_md.progress("arch: exit", 0x3eab); 369 370 paging_init(); 371 372 /* this is for modules since _machine can be a define -- Cort */ 373 ppc_md.ppc_machine = _machine; 374 } 375