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