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