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