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 bootx_init(unsigned long r4, unsigned long phys); 54 55 boot_infos_t *boot_infos; 56 struct ide_machdep_calls ppc_ide_md; 57 58 int boot_cpuid; 59 EXPORT_SYMBOL_GPL(boot_cpuid); 60 int boot_cpuid_phys; 61 62 unsigned long ISA_DMA_THRESHOLD; 63 unsigned int DMA_MODE_READ; 64 unsigned int DMA_MODE_WRITE; 65 66 int have_of = 1; 67 68 #ifdef CONFIG_PPC_MULTIPLATFORM 69 dev_t boot_dev; 70 #endif /* CONFIG_PPC_MULTIPLATFORM */ 71 72 #ifdef CONFIG_MAGIC_SYSRQ 73 unsigned long SYSRQ_KEY = 0x54; 74 #endif /* CONFIG_MAGIC_SYSRQ */ 75 76 #ifdef CONFIG_VGA_CONSOLE 77 unsigned long vgacon_remap_base; 78 #endif 79 80 /* 81 * These are used in binfmt_elf.c to put aux entries on the stack 82 * for each elf executable being started. 83 */ 84 int dcache_bsize; 85 int icache_bsize; 86 int ucache_bsize; 87 88 /* 89 * We're called here very early in the boot. We determine the machine 90 * type and call the appropriate low-level setup functions. 91 * -- Cort <cort@fsmlabs.com> 92 * 93 * Note that the kernel may be running at an address which is different 94 * from the address that it was linked at, so we must use RELOC/PTRRELOC 95 * to access static data (including strings). -- paulus 96 */ 97 unsigned long __init early_init(unsigned long dt_ptr) 98 { 99 unsigned long offset = reloc_offset(); 100 101 /* First zero the BSS -- use memset_io, some platforms don't have 102 * caches on yet */ 103 memset_io((void __iomem *)PTRRELOC(&__bss_start), 0, _end - __bss_start); 104 105 /* 106 * Identify the CPU type and fix up code sections 107 * that depend on which cpu we have. 108 */ 109 identify_cpu(offset, 0); 110 do_cpu_ftr_fixups(offset); 111 112 return KERNELBASE + offset; 113 } 114 115 116 /* 117 * Find out what kind of machine we're on and save any data we need 118 * from the early boot process (devtree is copied on pmac by prom_init()). 119 * This is called very early on the boot process, after a minimal 120 * MMU environment has been set up but before MMU_init is called. 121 */ 122 void __init machine_init(unsigned long dt_ptr, unsigned long phys) 123 { 124 /* If btext is enabled, we might have a BAT setup for early display, 125 * thus we do enable some very basic udbg output 126 */ 127 #ifdef CONFIG_BOOTX_TEXT 128 udbg_putc = btext_drawchar; 129 #endif 130 131 /* Do some early initialization based on the flat device tree */ 132 early_init_devtree(__va(dt_ptr)); 133 134 probe_machine(); 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 if (ppc_md.progress) 143 ppc_md.progress("id mach(): done", 0x200); 144 } 145 146 #ifdef CONFIG_BOOKE_WDT 147 /* Checks wdt=x and wdt_period=xx command-line option */ 148 int __init early_parse_wdt(char *p) 149 { 150 if (p && strncmp(p, "0", 1) != 0) 151 booke_wdt_enabled = 1; 152 153 return 0; 154 } 155 early_param("wdt", early_parse_wdt); 156 157 int __init early_parse_wdt_period (char *p) 158 { 159 if (p) 160 booke_wdt_period = simple_strtoul(p, NULL, 0); 161 162 return 0; 163 } 164 early_param("wdt_period", early_parse_wdt_period); 165 #endif /* CONFIG_BOOKE_WDT */ 166 167 /* Checks "l2cr=xxxx" command-line option */ 168 int __init ppc_setup_l2cr(char *str) 169 { 170 if (cpu_has_feature(CPU_FTR_L2CR)) { 171 unsigned long val = simple_strtoul(str, NULL, 0); 172 printk(KERN_INFO "l2cr set to %lx\n", val); 173 _set_L2CR(0); /* force invalidate by disable cache */ 174 _set_L2CR(val); /* and enable it */ 175 } 176 return 1; 177 } 178 __setup("l2cr=", ppc_setup_l2cr); 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 struct cpu cpu_devices[NR_CPUS]; 208 209 int __init ppc_init(void) 210 { 211 int i; 212 213 /* clear the progress line */ 214 if ( ppc_md.progress ) ppc_md.progress(" ", 0xffff); 215 216 /* register CPU devices */ 217 for_each_possible_cpu(i) 218 register_cpu(&cpu_devices[i], i); 219 220 /* call platform init */ 221 if (ppc_md.init != NULL) { 222 ppc_md.init(); 223 } 224 return 0; 225 } 226 227 arch_initcall(ppc_init); 228 229 /* Warning, IO base is not yet inited */ 230 void __init setup_arch(char **cmdline_p) 231 { 232 *cmdline_p = cmd_line; 233 234 /* so udelay does something sensible, assume <= 1000 bogomips */ 235 loops_per_jiffy = 500000000 / HZ; 236 237 unflatten_device_tree(); 238 check_for_initrd(); 239 240 if (ppc_md.init_early) 241 ppc_md.init_early(); 242 243 find_legacy_serial_ports(); 244 finish_device_tree(); 245 246 smp_setup_cpu_maps(); 247 248 #ifdef CONFIG_XMON_DEFAULT 249 xmon_init(1); 250 #endif 251 /* Register early console */ 252 register_early_udbg_console(); 253 254 #if defined(CONFIG_KGDB) 255 if (ppc_md.kgdb_map_scc) 256 ppc_md.kgdb_map_scc(); 257 set_debug_traps(); 258 if (strstr(cmd_line, "gdb")) { 259 if (ppc_md.progress) 260 ppc_md.progress("setup_arch: kgdb breakpoint", 0x4000); 261 printk("kgdb breakpoint activated\n"); 262 breakpoint(); 263 } 264 #endif 265 266 /* 267 * Set cache line size based on type of cpu as a default. 268 * Systems with OF can look in the properties on the cpu node(s) 269 * for a possibly more accurate value. 270 */ 271 if (cpu_has_feature(CPU_FTR_SPLIT_ID_CACHE)) { 272 dcache_bsize = cur_cpu_spec->dcache_bsize; 273 icache_bsize = cur_cpu_spec->icache_bsize; 274 ucache_bsize = 0; 275 } else 276 ucache_bsize = dcache_bsize = icache_bsize 277 = cur_cpu_spec->dcache_bsize; 278 279 /* reboot on panic */ 280 panic_timeout = 180; 281 282 if (ppc_md.panic) 283 setup_panic(); 284 285 init_mm.start_code = PAGE_OFFSET; 286 init_mm.end_code = (unsigned long) _etext; 287 init_mm.end_data = (unsigned long) _edata; 288 init_mm.brk = klimit; 289 290 if (do_early_xmon) 291 debugger(NULL); 292 293 /* set up the bootmem stuff with available memory */ 294 do_init_bootmem(); 295 if ( ppc_md.progress ) ppc_md.progress("setup_arch: bootmem", 0x3eab); 296 297 #ifdef CONFIG_DUMMY_CONSOLE 298 conswitchp = &dummy_con; 299 #endif 300 301 ppc_md.setup_arch(); 302 if ( ppc_md.progress ) ppc_md.progress("arch: exit", 0x3eab); 303 304 paging_init(); 305 } 306