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/tty.h> 14 #include <linux/bootmem.h> 15 #include <linux/seq_file.h> 16 #include <linux/root_dev.h> 17 #include <linux/cpu.h> 18 #include <linux/console.h> 19 #include <linux/memblock.h> 20 21 #include <asm/io.h> 22 #include <asm/prom.h> 23 #include <asm/processor.h> 24 #include <asm/pgtable.h> 25 #include <asm/setup.h> 26 #include <asm/smp.h> 27 #include <asm/elf.h> 28 #include <asm/cputable.h> 29 #include <asm/bootx.h> 30 #include <asm/btext.h> 31 #include <asm/machdep.h> 32 #include <asm/uaccess.h> 33 #include <asm/system.h> 34 #include <asm/pmac_feature.h> 35 #include <asm/sections.h> 36 #include <asm/nvram.h> 37 #include <asm/xmon.h> 38 #include <asm/time.h> 39 #include <asm/serial.h> 40 #include <asm/udbg.h> 41 #include <asm/mmu_context.h> 42 43 #include "setup.h" 44 45 #define DBG(fmt...) 46 47 extern void bootx_init(unsigned long r4, unsigned long phys); 48 49 int boot_cpuid = -1; 50 EXPORT_SYMBOL_GPL(boot_cpuid); 51 int boot_cpuid_phys; 52 EXPORT_SYMBOL_GPL(boot_cpuid_phys); 53 54 int smp_hw_index[NR_CPUS]; 55 56 unsigned long ISA_DMA_THRESHOLD; 57 unsigned int DMA_MODE_READ; 58 unsigned int DMA_MODE_WRITE; 59 60 #ifdef CONFIG_VGA_CONSOLE 61 unsigned long vgacon_remap_base; 62 EXPORT_SYMBOL(vgacon_remap_base); 63 #endif 64 65 /* 66 * These are used in binfmt_elf.c to put aux entries on the stack 67 * for each elf executable being started. 68 */ 69 int dcache_bsize; 70 int icache_bsize; 71 int ucache_bsize; 72 73 /* 74 * We're called here very early in the boot. We determine the machine 75 * type and call the appropriate low-level setup functions. 76 * -- Cort <cort@fsmlabs.com> 77 * 78 * Note that the kernel may be running at an address which is different 79 * from the address that it was linked at, so we must use RELOC/PTRRELOC 80 * to access static data (including strings). -- paulus 81 */ 82 notrace unsigned long __init early_init(unsigned long dt_ptr) 83 { 84 unsigned long offset = reloc_offset(); 85 struct cpu_spec *spec; 86 87 /* First zero the BSS -- use memset_io, some platforms don't have 88 * caches on yet */ 89 memset_io((void __iomem *)PTRRELOC(&__bss_start), 0, 90 __bss_stop - __bss_start); 91 92 /* 93 * Identify the CPU type and fix up code sections 94 * that depend on which cpu we have. 95 */ 96 spec = identify_cpu(offset, mfspr(SPRN_PVR)); 97 98 do_feature_fixups(spec->cpu_features, 99 PTRRELOC(&__start___ftr_fixup), 100 PTRRELOC(&__stop___ftr_fixup)); 101 102 do_feature_fixups(spec->mmu_features, 103 PTRRELOC(&__start___mmu_ftr_fixup), 104 PTRRELOC(&__stop___mmu_ftr_fixup)); 105 106 do_lwsync_fixups(spec->cpu_features, 107 PTRRELOC(&__start___lwsync_fixup), 108 PTRRELOC(&__stop___lwsync_fixup)); 109 110 return KERNELBASE + offset; 111 } 112 113 114 /* 115 * Find out what kind of machine we're on and save any data we need 116 * from the early boot process (devtree is copied on pmac by prom_init()). 117 * This is called very early on the boot process, after a minimal 118 * MMU environment has been set up but before MMU_init is called. 119 */ 120 notrace void __init machine_init(u64 dt_ptr) 121 { 122 lockdep_init(); 123 124 /* Enable early debugging if any specified (see udbg.h) */ 125 udbg_early_init(); 126 127 /* Do some early initialization based on the flat device tree */ 128 early_init_devtree(__va(dt_ptr)); 129 130 early_init_mmu(); 131 132 probe_machine(); 133 134 setup_kdump_trampoline(); 135 136 #ifdef CONFIG_6xx 137 if (cpu_has_feature(CPU_FTR_CAN_DOZE) || 138 cpu_has_feature(CPU_FTR_CAN_NAP)) 139 ppc_md.power_save = ppc6xx_idle; 140 #endif 141 142 #ifdef CONFIG_E500 143 if (cpu_has_feature(CPU_FTR_CAN_DOZE) || 144 cpu_has_feature(CPU_FTR_CAN_NAP)) 145 ppc_md.power_save = e500_idle; 146 #endif 147 if (ppc_md.progress) 148 ppc_md.progress("id mach(): done", 0x200); 149 } 150 151 #ifdef CONFIG_BOOKE_WDT 152 /* Checks wdt=x and wdt_period=xx command-line option */ 153 notrace int __init early_parse_wdt(char *p) 154 { 155 if (p && strncmp(p, "0", 1) != 0) 156 booke_wdt_enabled = 1; 157 158 return 0; 159 } 160 early_param("wdt", early_parse_wdt); 161 162 int __init early_parse_wdt_period (char *p) 163 { 164 if (p) 165 booke_wdt_period = simple_strtoul(p, NULL, 0); 166 167 return 0; 168 } 169 early_param("wdt_period", early_parse_wdt_period); 170 #endif /* CONFIG_BOOKE_WDT */ 171 172 /* Checks "l2cr=xxxx" command-line option */ 173 int __init ppc_setup_l2cr(char *str) 174 { 175 if (cpu_has_feature(CPU_FTR_L2CR)) { 176 unsigned long val = simple_strtoul(str, NULL, 0); 177 printk(KERN_INFO "l2cr set to %lx\n", val); 178 _set_L2CR(0); /* force invalidate by disable cache */ 179 _set_L2CR(val); /* and enable it */ 180 } 181 return 1; 182 } 183 __setup("l2cr=", ppc_setup_l2cr); 184 185 /* Checks "l3cr=xxxx" command-line option */ 186 int __init ppc_setup_l3cr(char *str) 187 { 188 if (cpu_has_feature(CPU_FTR_L3CR)) { 189 unsigned long val = simple_strtoul(str, NULL, 0); 190 printk(KERN_INFO "l3cr set to %lx\n", val); 191 _set_L3CR(val); /* and enable it */ 192 } 193 return 1; 194 } 195 __setup("l3cr=", ppc_setup_l3cr); 196 197 #ifdef CONFIG_GENERIC_NVRAM 198 199 /* Generic nvram hooks used by drivers/char/gen_nvram.c */ 200 unsigned char nvram_read_byte(int addr) 201 { 202 if (ppc_md.nvram_read_val) 203 return ppc_md.nvram_read_val(addr); 204 return 0xff; 205 } 206 EXPORT_SYMBOL(nvram_read_byte); 207 208 void nvram_write_byte(unsigned char val, int addr) 209 { 210 if (ppc_md.nvram_write_val) 211 ppc_md.nvram_write_val(addr, val); 212 } 213 EXPORT_SYMBOL(nvram_write_byte); 214 215 ssize_t nvram_get_size(void) 216 { 217 if (ppc_md.nvram_size) 218 return ppc_md.nvram_size(); 219 return -1; 220 } 221 EXPORT_SYMBOL(nvram_get_size); 222 223 void nvram_sync(void) 224 { 225 if (ppc_md.nvram_sync) 226 ppc_md.nvram_sync(); 227 } 228 EXPORT_SYMBOL(nvram_sync); 229 230 #endif /* CONFIG_NVRAM */ 231 232 int __init ppc_init(void) 233 { 234 /* clear the progress line */ 235 if (ppc_md.progress) 236 ppc_md.progress(" ", 0xffff); 237 238 /* call platform init */ 239 if (ppc_md.init != NULL) { 240 ppc_md.init(); 241 } 242 return 0; 243 } 244 245 arch_initcall(ppc_init); 246 247 static void __init irqstack_early_init(void) 248 { 249 unsigned int i; 250 251 /* interrupt stacks must be in lowmem, we get that for free on ppc32 252 * as the memblock is limited to lowmem by default */ 253 for_each_possible_cpu(i) { 254 softirq_ctx[i] = (struct thread_info *) 255 __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE)); 256 hardirq_ctx[i] = (struct thread_info *) 257 __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE)); 258 } 259 } 260 261 #if defined(CONFIG_BOOKE) || defined(CONFIG_40x) 262 static void __init exc_lvl_early_init(void) 263 { 264 unsigned int i, hw_cpu; 265 266 /* interrupt stacks must be in lowmem, we get that for free on ppc32 267 * as the memblock is limited to lowmem by MEMBLOCK_REAL_LIMIT */ 268 for_each_possible_cpu(i) { 269 hw_cpu = get_hard_smp_processor_id(i); 270 critirq_ctx[hw_cpu] = (struct thread_info *) 271 __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE)); 272 #ifdef CONFIG_BOOKE 273 dbgirq_ctx[hw_cpu] = (struct thread_info *) 274 __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE)); 275 mcheckirq_ctx[hw_cpu] = (struct thread_info *) 276 __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE)); 277 #endif 278 } 279 } 280 #else 281 #define exc_lvl_early_init() 282 #endif 283 284 /* Warning, IO base is not yet inited */ 285 void __init setup_arch(char **cmdline_p) 286 { 287 *cmdline_p = cmd_line; 288 289 /* so udelay does something sensible, assume <= 1000 bogomips */ 290 loops_per_jiffy = 500000000 / HZ; 291 292 unflatten_device_tree(); 293 check_for_initrd(); 294 295 if (ppc_md.init_early) 296 ppc_md.init_early(); 297 298 find_legacy_serial_ports(); 299 300 smp_setup_cpu_maps(); 301 302 /* Register early console */ 303 register_early_udbg_console(); 304 305 xmon_setup(); 306 307 /* 308 * Set cache line size based on type of cpu as a default. 309 * Systems with OF can look in the properties on the cpu node(s) 310 * for a possibly more accurate value. 311 */ 312 dcache_bsize = cur_cpu_spec->dcache_bsize; 313 icache_bsize = cur_cpu_spec->icache_bsize; 314 ucache_bsize = 0; 315 if (cpu_has_feature(CPU_FTR_UNIFIED_ID_CACHE)) 316 ucache_bsize = icache_bsize = dcache_bsize; 317 318 /* reboot on panic */ 319 panic_timeout = 180; 320 321 if (ppc_md.panic) 322 setup_panic(); 323 324 init_mm.start_code = (unsigned long)_stext; 325 init_mm.end_code = (unsigned long) _etext; 326 init_mm.end_data = (unsigned long) _edata; 327 init_mm.brk = klimit; 328 329 exc_lvl_early_init(); 330 331 irqstack_early_init(); 332 333 /* set up the bootmem stuff with available memory */ 334 do_init_bootmem(); 335 if ( ppc_md.progress ) ppc_md.progress("setup_arch: bootmem", 0x3eab); 336 337 #ifdef CONFIG_DUMMY_CONSOLE 338 conswitchp = &dummy_con; 339 #endif 340 341 if (ppc_md.setup_arch) 342 ppc_md.setup_arch(); 343 if ( ppc_md.progress ) ppc_md.progress("arch: exit", 0x3eab); 344 345 paging_init(); 346 347 /* Initialize the MMU context management stuff */ 348 mmu_context_init(); 349 350 } 351