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 #if defined CONFIG_KGDB 47 #include <asm/kgdb.h> 48 #endif 49 50 extern void bootx_init(unsigned long r4, unsigned long phys); 51 52 int boot_cpuid; 53 EXPORT_SYMBOL_GPL(boot_cpuid); 54 int boot_cpuid_phys; 55 56 unsigned long ISA_DMA_THRESHOLD; 57 unsigned int DMA_MODE_READ; 58 unsigned int DMA_MODE_WRITE; 59 60 int have_of = 1; 61 62 #ifdef CONFIG_VGA_CONSOLE 63 unsigned long vgacon_remap_base; 64 EXPORT_SYMBOL(vgacon_remap_base); 65 #endif 66 67 /* 68 * These are used in binfmt_elf.c to put aux entries on the stack 69 * for each elf executable being started. 70 */ 71 int dcache_bsize; 72 int icache_bsize; 73 int ucache_bsize; 74 75 /* 76 * We're called here very early in the boot. We determine the machine 77 * type and call the appropriate low-level setup functions. 78 * -- Cort <cort@fsmlabs.com> 79 * 80 * Note that the kernel may be running at an address which is different 81 * from the address that it was linked at, so we must use RELOC/PTRRELOC 82 * to access static data (including strings). -- paulus 83 */ 84 unsigned long __init early_init(unsigned long dt_ptr) 85 { 86 unsigned long offset = reloc_offset(); 87 struct cpu_spec *spec; 88 89 /* First zero the BSS -- use memset_io, some platforms don't have 90 * caches on yet */ 91 memset_io((void __iomem *)PTRRELOC(&__bss_start), 0, 92 __bss_stop - __bss_start); 93 94 /* 95 * Identify the CPU type and fix up code sections 96 * that depend on which cpu we have. 97 */ 98 spec = identify_cpu(offset, mfspr(SPRN_PVR)); 99 100 do_feature_fixups(spec->cpu_features, 101 PTRRELOC(&__start___ftr_fixup), 102 PTRRELOC(&__stop___ftr_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 void __init machine_init(unsigned long dt_ptr, unsigned long phys) 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 if (ppc_md.progress) 131 ppc_md.progress("id mach(): done", 0x200); 132 } 133 134 #ifdef CONFIG_BOOKE_WDT 135 /* Checks wdt=x and wdt_period=xx command-line option */ 136 int __init early_parse_wdt(char *p) 137 { 138 if (p && strncmp(p, "0", 1) != 0) 139 booke_wdt_enabled = 1; 140 141 return 0; 142 } 143 early_param("wdt", early_parse_wdt); 144 145 int __init early_parse_wdt_period (char *p) 146 { 147 if (p) 148 booke_wdt_period = simple_strtoul(p, NULL, 0); 149 150 return 0; 151 } 152 early_param("wdt_period", early_parse_wdt_period); 153 #endif /* CONFIG_BOOKE_WDT */ 154 155 /* Checks "l2cr=xxxx" command-line option */ 156 int __init ppc_setup_l2cr(char *str) 157 { 158 if (cpu_has_feature(CPU_FTR_L2CR)) { 159 unsigned long val = simple_strtoul(str, NULL, 0); 160 printk(KERN_INFO "l2cr set to %lx\n", val); 161 _set_L2CR(0); /* force invalidate by disable cache */ 162 _set_L2CR(val); /* and enable it */ 163 } 164 return 1; 165 } 166 __setup("l2cr=", ppc_setup_l2cr); 167 168 /* Checks "l3cr=xxxx" command-line option */ 169 int __init ppc_setup_l3cr(char *str) 170 { 171 if (cpu_has_feature(CPU_FTR_L3CR)) { 172 unsigned long val = simple_strtoul(str, NULL, 0); 173 printk(KERN_INFO "l3cr set to %lx\n", val); 174 _set_L3CR(val); /* and enable it */ 175 } 176 return 1; 177 } 178 __setup("l3cr=", ppc_setup_l3cr); 179 180 #ifdef CONFIG_GENERIC_NVRAM 181 182 /* Generic nvram hooks used by drivers/char/gen_nvram.c */ 183 unsigned char nvram_read_byte(int addr) 184 { 185 if (ppc_md.nvram_read_val) 186 return ppc_md.nvram_read_val(addr); 187 return 0xff; 188 } 189 EXPORT_SYMBOL(nvram_read_byte); 190 191 void nvram_write_byte(unsigned char val, int addr) 192 { 193 if (ppc_md.nvram_write_val) 194 ppc_md.nvram_write_val(addr, val); 195 } 196 EXPORT_SYMBOL(nvram_write_byte); 197 198 void nvram_sync(void) 199 { 200 if (ppc_md.nvram_sync) 201 ppc_md.nvram_sync(); 202 } 203 EXPORT_SYMBOL(nvram_sync); 204 205 #endif /* CONFIG_NVRAM */ 206 207 static DEFINE_PER_CPU(struct cpu, cpu_devices); 208 209 int __init ppc_init(void) 210 { 211 int cpu; 212 213 /* clear the progress line */ 214 if (ppc_md.progress) 215 ppc_md.progress(" ", 0xffff); 216 217 /* register CPU devices */ 218 for_each_possible_cpu(cpu) { 219 struct cpu *c = &per_cpu(cpu_devices, cpu); 220 c->hotpluggable = 1; 221 register_cpu(c, cpu); 222 } 223 224 /* call platform init */ 225 if (ppc_md.init != NULL) { 226 ppc_md.init(); 227 } 228 return 0; 229 } 230 231 arch_initcall(ppc_init); 232 233 #ifdef CONFIG_IRQSTACKS 234 static void __init irqstack_early_init(void) 235 { 236 unsigned int i; 237 238 /* interrupt stacks must be in lowmem, we get that for free on ppc32 239 * as the lmb is limited to lowmem by LMB_REAL_LIMIT */ 240 for_each_possible_cpu(i) { 241 softirq_ctx[i] = (struct thread_info *) 242 __va(lmb_alloc(THREAD_SIZE, THREAD_SIZE)); 243 hardirq_ctx[i] = (struct thread_info *) 244 __va(lmb_alloc(THREAD_SIZE, THREAD_SIZE)); 245 } 246 } 247 #else 248 #define irqstack_early_init() 249 #endif 250 251 /* Warning, IO base is not yet inited */ 252 void __init setup_arch(char **cmdline_p) 253 { 254 *cmdline_p = cmd_line; 255 256 /* so udelay does something sensible, assume <= 1000 bogomips */ 257 loops_per_jiffy = 500000000 / HZ; 258 259 unflatten_device_tree(); 260 check_for_initrd(); 261 262 if (ppc_md.init_early) 263 ppc_md.init_early(); 264 265 find_legacy_serial_ports(); 266 267 smp_setup_cpu_maps(); 268 269 /* Register early console */ 270 register_early_udbg_console(); 271 272 xmon_setup(); 273 274 #if defined(CONFIG_KGDB) 275 if (ppc_md.kgdb_map_scc) 276 ppc_md.kgdb_map_scc(); 277 set_debug_traps(); 278 if (strstr(cmd_line, "gdb")) { 279 if (ppc_md.progress) 280 ppc_md.progress("setup_arch: kgdb breakpoint", 0x4000); 281 printk("kgdb breakpoint activated\n"); 282 breakpoint(); 283 } 284 #endif 285 286 /* 287 * Set cache line size based on type of cpu as a default. 288 * Systems with OF can look in the properties on the cpu node(s) 289 * for a possibly more accurate value. 290 */ 291 dcache_bsize = cur_cpu_spec->dcache_bsize; 292 icache_bsize = cur_cpu_spec->icache_bsize; 293 ucache_bsize = 0; 294 if (cpu_has_feature(CPU_FTR_UNIFIED_ID_CACHE)) 295 ucache_bsize = icache_bsize = dcache_bsize; 296 297 /* reboot on panic */ 298 panic_timeout = 180; 299 300 if (ppc_md.panic) 301 setup_panic(); 302 303 init_mm.start_code = (unsigned long)_stext; 304 init_mm.end_code = (unsigned long) _etext; 305 init_mm.end_data = (unsigned long) _edata; 306 init_mm.brk = klimit; 307 308 irqstack_early_init(); 309 310 /* set up the bootmem stuff with available memory */ 311 do_init_bootmem(); 312 if ( ppc_md.progress ) ppc_md.progress("setup_arch: bootmem", 0x3eab); 313 314 #ifdef CONFIG_DUMMY_CONSOLE 315 conswitchp = &dummy_con; 316 #endif 317 318 if (ppc_md.setup_arch) 319 ppc_md.setup_arch(); 320 if ( ppc_md.progress ) ppc_md.progress("arch: exit", 0x3eab); 321 322 paging_init(); 323 } 324