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 extern void ppc6xx_idle(void); 57 extern void power4_idle(void); 58 59 boot_infos_t *boot_infos; 60 struct ide_machdep_calls ppc_ide_md; 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 extern void prep_init(void); 74 extern void pmac_init(void); 75 extern void chrp_init(void); 76 77 dev_t boot_dev; 78 #endif /* CONFIG_PPC_MULTIPLATFORM */ 79 80 #ifdef CONFIG_MAGIC_SYSRQ 81 unsigned long SYSRQ_KEY = 0x54; 82 #endif /* CONFIG_MAGIC_SYSRQ */ 83 84 #ifdef CONFIG_VGA_CONSOLE 85 unsigned long vgacon_remap_base; 86 #endif 87 88 struct machdep_calls ppc_md; 89 EXPORT_SYMBOL(ppc_md); 90 91 /* 92 * These are used in binfmt_elf.c to put aux entries on the stack 93 * for each elf executable being started. 94 */ 95 int dcache_bsize; 96 int icache_bsize; 97 int ucache_bsize; 98 99 /* 100 * We're called here very early in the boot. We determine the machine 101 * type and call the appropriate low-level setup functions. 102 * -- Cort <cort@fsmlabs.com> 103 * 104 * Note that the kernel may be running at an address which is different 105 * from the address that it was linked at, so we must use RELOC/PTRRELOC 106 * to access static data (including strings). -- paulus 107 */ 108 unsigned long __init early_init(unsigned long dt_ptr) 109 { 110 unsigned long offset = reloc_offset(); 111 112 /* First zero the BSS -- use memset_io, some platforms don't have 113 * caches on yet */ 114 memset_io(PTRRELOC(&__bss_start), 0, _end - __bss_start); 115 116 /* 117 * Identify the CPU type and fix up code sections 118 * that depend on which cpu we have. 119 */ 120 identify_cpu(offset, 0); 121 do_cpu_ftr_fixups(offset); 122 123 return KERNELBASE + offset; 124 } 125 126 #ifdef CONFIG_PPC_MULTIPLATFORM 127 /* 128 * The PPC_MULTIPLATFORM version of platform_init... 129 */ 130 void __init platform_init(void) 131 { 132 /* if we didn't get any bootinfo telling us what we are... */ 133 if (_machine == 0) { 134 /* prep boot loader tells us if we're prep or not */ 135 if ( *(unsigned long *)(KERNELBASE) == (0xdeadc0de) ) 136 _machine = _MACH_prep; 137 } 138 139 #ifdef CONFIG_PPC_PREP 140 /* not much more to do here, if prep */ 141 if (_machine == _MACH_prep) { 142 prep_init(); 143 return; 144 } 145 #endif 146 147 #ifdef CONFIG_ADB 148 if (strstr(cmd_line, "adb_sync")) { 149 extern int __adb_probe_sync; 150 __adb_probe_sync = 1; 151 } 152 #endif /* CONFIG_ADB */ 153 154 switch (_machine) { 155 #ifdef CONFIG_PPC_PMAC 156 case _MACH_Pmac: 157 pmac_init(); 158 break; 159 #endif 160 #ifdef CONFIG_PPC_CHRP 161 case _MACH_chrp: 162 chrp_init(); 163 break; 164 #endif 165 } 166 } 167 #endif 168 169 /* 170 * Find out what kind of machine we're on and save any data we need 171 * from the early boot process (devtree is copied on pmac by prom_init()). 172 * This is called very early on the boot process, after a minimal 173 * MMU environment has been set up but before MMU_init is called. 174 */ 175 void __init machine_init(unsigned long dt_ptr, unsigned long phys) 176 { 177 /* If btext is enabled, we might have a BAT setup for early display, 178 * thus we do enable some very basic udbg output 179 */ 180 #ifdef CONFIG_BOOTX_TEXT 181 udbg_putc = btext_drawchar; 182 #endif 183 184 /* Do some early initialization based on the flat device tree */ 185 early_init_devtree(__va(dt_ptr)); 186 187 /* Check default command line */ 188 #ifdef CONFIG_CMDLINE 189 if (cmd_line[0] == 0) 190 strlcpy(cmd_line, CONFIG_CMDLINE, sizeof(cmd_line)); 191 #endif /* CONFIG_CMDLINE */ 192 193 /* Base init based on machine type */ 194 platform_init(); 195 196 #ifdef CONFIG_6xx 197 ppc_md.power_save = ppc6xx_idle; 198 #endif 199 200 if (ppc_md.progress) 201 ppc_md.progress("id mach(): done", 0x200); 202 } 203 204 #ifdef CONFIG_BOOKE_WDT 205 /* Checks wdt=x and wdt_period=xx command-line option */ 206 int __init early_parse_wdt(char *p) 207 { 208 if (p && strncmp(p, "0", 1) != 0) 209 booke_wdt_enabled = 1; 210 211 return 0; 212 } 213 early_param("wdt", early_parse_wdt); 214 215 int __init early_parse_wdt_period (char *p) 216 { 217 if (p) 218 booke_wdt_period = simple_strtoul(p, NULL, 0); 219 220 return 0; 221 } 222 early_param("wdt_period", early_parse_wdt_period); 223 #endif /* CONFIG_BOOKE_WDT */ 224 225 /* Checks "l2cr=xxxx" command-line option */ 226 int __init ppc_setup_l2cr(char *str) 227 { 228 if (cpu_has_feature(CPU_FTR_L2CR)) { 229 unsigned long val = simple_strtoul(str, NULL, 0); 230 printk(KERN_INFO "l2cr set to %lx\n", val); 231 _set_L2CR(0); /* force invalidate by disable cache */ 232 _set_L2CR(val); /* and enable it */ 233 } 234 return 1; 235 } 236 __setup("l2cr=", ppc_setup_l2cr); 237 238 #ifdef CONFIG_GENERIC_NVRAM 239 240 /* Generic nvram hooks used by drivers/char/gen_nvram.c */ 241 unsigned char nvram_read_byte(int addr) 242 { 243 if (ppc_md.nvram_read_val) 244 return ppc_md.nvram_read_val(addr); 245 return 0xff; 246 } 247 EXPORT_SYMBOL(nvram_read_byte); 248 249 void nvram_write_byte(unsigned char val, int addr) 250 { 251 if (ppc_md.nvram_write_val) 252 ppc_md.nvram_write_val(addr, val); 253 } 254 EXPORT_SYMBOL(nvram_write_byte); 255 256 void nvram_sync(void) 257 { 258 if (ppc_md.nvram_sync) 259 ppc_md.nvram_sync(); 260 } 261 EXPORT_SYMBOL(nvram_sync); 262 263 #endif /* CONFIG_NVRAM */ 264 265 static struct cpu cpu_devices[NR_CPUS]; 266 267 int __init ppc_init(void) 268 { 269 int i; 270 271 /* clear the progress line */ 272 if ( ppc_md.progress ) ppc_md.progress(" ", 0xffff); 273 274 /* register CPU devices */ 275 for (i = 0; i < NR_CPUS; i++) 276 if (cpu_possible(i)) 277 register_cpu(&cpu_devices[i], i, NULL); 278 279 /* call platform init */ 280 if (ppc_md.init != NULL) { 281 ppc_md.init(); 282 } 283 return 0; 284 } 285 286 arch_initcall(ppc_init); 287 288 /* Warning, IO base is not yet inited */ 289 void __init setup_arch(char **cmdline_p) 290 { 291 extern void do_init_bootmem(void); 292 293 /* so udelay does something sensible, assume <= 1000 bogomips */ 294 loops_per_jiffy = 500000000 / HZ; 295 296 unflatten_device_tree(); 297 check_for_initrd(); 298 299 if (ppc_md.init_early) 300 ppc_md.init_early(); 301 302 #ifdef CONFIG_PPC_MULTIPLATFORM 303 find_legacy_serial_ports(); 304 #endif 305 finish_device_tree(); 306 307 smp_setup_cpu_maps(); 308 309 #ifdef CONFIG_XMON_DEFAULT 310 xmon_init(1); 311 #endif 312 /* Register early console */ 313 register_early_udbg_console(); 314 315 #if defined(CONFIG_KGDB) 316 if (ppc_md.kgdb_map_scc) 317 ppc_md.kgdb_map_scc(); 318 set_debug_traps(); 319 if (strstr(cmd_line, "gdb")) { 320 if (ppc_md.progress) 321 ppc_md.progress("setup_arch: kgdb breakpoint", 0x4000); 322 printk("kgdb breakpoint activated\n"); 323 breakpoint(); 324 } 325 #endif 326 327 /* 328 * Set cache line size based on type of cpu as a default. 329 * Systems with OF can look in the properties on the cpu node(s) 330 * for a possibly more accurate value. 331 */ 332 if (cpu_has_feature(CPU_FTR_SPLIT_ID_CACHE)) { 333 dcache_bsize = cur_cpu_spec->dcache_bsize; 334 icache_bsize = cur_cpu_spec->icache_bsize; 335 ucache_bsize = 0; 336 } else 337 ucache_bsize = dcache_bsize = icache_bsize 338 = cur_cpu_spec->dcache_bsize; 339 340 /* reboot on panic */ 341 panic_timeout = 180; 342 343 init_mm.start_code = PAGE_OFFSET; 344 init_mm.end_code = (unsigned long) _etext; 345 init_mm.end_data = (unsigned long) _edata; 346 init_mm.brk = klimit; 347 348 /* Save unparsed command line copy for /proc/cmdline */ 349 strlcpy(saved_command_line, cmd_line, COMMAND_LINE_SIZE); 350 *cmdline_p = cmd_line; 351 352 parse_early_param(); 353 354 /* set up the bootmem stuff with available memory */ 355 do_init_bootmem(); 356 if ( ppc_md.progress ) ppc_md.progress("setup_arch: bootmem", 0x3eab); 357 358 #ifdef CONFIG_PPC_OCP 359 /* Initialize OCP device list */ 360 ocp_early_init(); 361 if ( ppc_md.progress ) ppc_md.progress("ocp: exit", 0x3eab); 362 #endif 363 364 #ifdef CONFIG_DUMMY_CONSOLE 365 conswitchp = &dummy_con; 366 #endif 367 368 ppc_md.setup_arch(); 369 if ( ppc_md.progress ) ppc_md.progress("arch: exit", 0x3eab); 370 371 paging_init(); 372 373 /* this is for modules since _machine can be a define -- Cort */ 374 ppc_md.ppc_machine = _machine; 375 } 376