1 /* 2 * arch/sh/kernel/setup.c 3 * 4 * This file handles the architecture-dependent parts of initialization 5 * 6 * Copyright (C) 1999 Niibe Yutaka 7 * Copyright (C) 2002 - 2010 Paul Mundt 8 */ 9 #include <linux/screen_info.h> 10 #include <linux/ioport.h> 11 #include <linux/init.h> 12 #include <linux/initrd.h> 13 #include <linux/bootmem.h> 14 #include <linux/console.h> 15 #include <linux/root_dev.h> 16 #include <linux/utsname.h> 17 #include <linux/nodemask.h> 18 #include <linux/cpu.h> 19 #include <linux/pfn.h> 20 #include <linux/fs.h> 21 #include <linux/mm.h> 22 #include <linux/kexec.h> 23 #include <linux/module.h> 24 #include <linux/smp.h> 25 #include <linux/err.h> 26 #include <linux/crash_dump.h> 27 #include <linux/mmzone.h> 28 #include <linux/clk.h> 29 #include <linux/delay.h> 30 #include <linux/platform_device.h> 31 #include <linux/memblock.h> 32 #include <asm/uaccess.h> 33 #include <asm/io.h> 34 #include <asm/page.h> 35 #include <asm/elf.h> 36 #include <asm/sections.h> 37 #include <asm/irq.h> 38 #include <asm/setup.h> 39 #include <asm/clock.h> 40 #include <asm/smp.h> 41 #include <asm/mmu_context.h> 42 #include <asm/mmzone.h> 43 #include <asm/sparsemem.h> 44 45 /* 46 * Initialize loops_per_jiffy as 10000000 (1000MIPS). 47 * This value will be used at the very early stage of serial setup. 48 * The bigger value means no problem. 49 */ 50 struct sh_cpuinfo cpu_data[NR_CPUS] __read_mostly = { 51 [0] = { 52 .type = CPU_SH_NONE, 53 .family = CPU_FAMILY_UNKNOWN, 54 .loops_per_jiffy = 10000000, 55 .phys_bits = MAX_PHYSMEM_BITS, 56 }, 57 }; 58 EXPORT_SYMBOL(cpu_data); 59 60 /* 61 * The machine vector. First entry in .machvec.init, or clobbered by 62 * sh_mv= on the command line, prior to .machvec.init teardown. 63 */ 64 struct sh_machine_vector sh_mv = { .mv_name = "generic", }; 65 EXPORT_SYMBOL(sh_mv); 66 67 #ifdef CONFIG_VT 68 struct screen_info screen_info; 69 #endif 70 71 extern int root_mountflags; 72 73 #define RAMDISK_IMAGE_START_MASK 0x07FF 74 #define RAMDISK_PROMPT_FLAG 0x8000 75 #define RAMDISK_LOAD_FLAG 0x4000 76 77 static char __initdata command_line[COMMAND_LINE_SIZE] = { 0, }; 78 79 static struct resource code_resource = { 80 .name = "Kernel code", 81 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 82 }; 83 84 static struct resource data_resource = { 85 .name = "Kernel data", 86 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 87 }; 88 89 static struct resource bss_resource = { 90 .name = "Kernel bss", 91 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 92 }; 93 94 unsigned long memory_start; 95 EXPORT_SYMBOL(memory_start); 96 unsigned long memory_end = 0; 97 EXPORT_SYMBOL(memory_end); 98 unsigned long memory_limit = 0; 99 100 static struct resource mem_resources[MAX_NUMNODES]; 101 102 int l1i_cache_shape, l1d_cache_shape, l2_cache_shape; 103 104 static int __init early_parse_mem(char *p) 105 { 106 if (!p) 107 return 1; 108 109 memory_limit = PAGE_ALIGN(memparse(p, &p)); 110 111 pr_notice("Memory limited to %ldMB\n", memory_limit >> 20); 112 113 return 0; 114 } 115 early_param("mem", early_parse_mem); 116 117 void __init check_for_initrd(void) 118 { 119 #ifdef CONFIG_BLK_DEV_INITRD 120 unsigned long start, end; 121 122 /* 123 * Check for the rare cases where boot loaders adhere to the boot 124 * ABI. 125 */ 126 if (!LOADER_TYPE || !INITRD_START || !INITRD_SIZE) 127 goto disable; 128 129 start = INITRD_START + __MEMORY_START; 130 end = start + INITRD_SIZE; 131 132 if (unlikely(end <= start)) 133 goto disable; 134 if (unlikely(start & ~PAGE_MASK)) { 135 pr_err("initrd must be page aligned\n"); 136 goto disable; 137 } 138 139 if (unlikely(start < __MEMORY_START)) { 140 pr_err("initrd start (%08lx) < __MEMORY_START(%x)\n", 141 start, __MEMORY_START); 142 goto disable; 143 } 144 145 if (unlikely(end > memblock_end_of_DRAM())) { 146 pr_err("initrd extends beyond end of memory " 147 "(0x%08lx > 0x%08lx)\ndisabling initrd\n", 148 end, (unsigned long)memblock_end_of_DRAM()); 149 goto disable; 150 } 151 152 /* 153 * If we got this far in spite of the boot loader's best efforts 154 * to the contrary, assume we actually have a valid initrd and 155 * fix up the root dev. 156 */ 157 ROOT_DEV = Root_RAM0; 158 159 /* 160 * Address sanitization 161 */ 162 initrd_start = (unsigned long)__va(start); 163 initrd_end = initrd_start + INITRD_SIZE; 164 165 memblock_reserve(__pa(initrd_start), INITRD_SIZE); 166 167 return; 168 169 disable: 170 pr_info("initrd disabled\n"); 171 initrd_start = initrd_end = 0; 172 #endif 173 } 174 175 void calibrate_delay(void) 176 { 177 struct clk *clk = clk_get(NULL, "cpu_clk"); 178 179 if (IS_ERR(clk)) 180 panic("Need a sane CPU clock definition!"); 181 182 loops_per_jiffy = (clk_get_rate(clk) >> 1) / HZ; 183 184 printk(KERN_INFO "Calibrating delay loop (skipped)... " 185 "%lu.%02lu BogoMIPS PRESET (lpj=%lu)\n", 186 loops_per_jiffy/(500000/HZ), 187 (loops_per_jiffy/(5000/HZ)) % 100, 188 loops_per_jiffy); 189 } 190 191 void __init __add_active_range(unsigned int nid, unsigned long start_pfn, 192 unsigned long end_pfn) 193 { 194 struct resource *res = &mem_resources[nid]; 195 unsigned long start, end; 196 197 WARN_ON(res->name); /* max one active range per node for now */ 198 199 start = start_pfn << PAGE_SHIFT; 200 end = end_pfn << PAGE_SHIFT; 201 202 res->name = "System RAM"; 203 res->start = start; 204 res->end = end - 1; 205 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY; 206 207 if (request_resource(&iomem_resource, res)) { 208 pr_err("unable to request memory_resource 0x%lx 0x%lx\n", 209 start_pfn, end_pfn); 210 return; 211 } 212 213 /* 214 * We don't know which RAM region contains kernel data or 215 * the reserved crashkernel region, so try it repeatedly 216 * and let the resource manager test it. 217 */ 218 request_resource(res, &code_resource); 219 request_resource(res, &data_resource); 220 request_resource(res, &bss_resource); 221 #ifdef CONFIG_KEXEC 222 request_resource(res, &crashk_res); 223 #endif 224 225 /* 226 * Also make sure that there is a PMB mapping that covers this 227 * range before we attempt to activate it, to avoid reset by MMU. 228 * We can hit this path with NUMA or memory hot-add. 229 */ 230 pmb_bolt_mapping((unsigned long)__va(start), start, end - start, 231 PAGE_KERNEL); 232 233 memblock_set_node(PFN_PHYS(start_pfn), PFN_PHYS(end_pfn - start_pfn), 234 &memblock.memory, nid); 235 } 236 237 void __init __weak plat_early_device_setup(void) 238 { 239 } 240 241 void __init setup_arch(char **cmdline_p) 242 { 243 enable_mmu(); 244 245 ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV); 246 247 printk(KERN_NOTICE "Boot params:\n" 248 "... MOUNT_ROOT_RDONLY - %08lx\n" 249 "... RAMDISK_FLAGS - %08lx\n" 250 "... ORIG_ROOT_DEV - %08lx\n" 251 "... LOADER_TYPE - %08lx\n" 252 "... INITRD_START - %08lx\n" 253 "... INITRD_SIZE - %08lx\n", 254 MOUNT_ROOT_RDONLY, RAMDISK_FLAGS, 255 ORIG_ROOT_DEV, LOADER_TYPE, 256 INITRD_START, INITRD_SIZE); 257 258 #ifdef CONFIG_BLK_DEV_RAM 259 rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK; 260 rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0); 261 rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0); 262 #endif 263 264 if (!MOUNT_ROOT_RDONLY) 265 root_mountflags &= ~MS_RDONLY; 266 init_mm.start_code = (unsigned long) _text; 267 init_mm.end_code = (unsigned long) _etext; 268 init_mm.end_data = (unsigned long) _edata; 269 init_mm.brk = (unsigned long) _end; 270 271 code_resource.start = virt_to_phys(_text); 272 code_resource.end = virt_to_phys(_etext)-1; 273 data_resource.start = virt_to_phys(_etext); 274 data_resource.end = virt_to_phys(_edata)-1; 275 bss_resource.start = virt_to_phys(__bss_start); 276 bss_resource.end = virt_to_phys(__bss_stop)-1; 277 278 #ifdef CONFIG_CMDLINE_OVERWRITE 279 strlcpy(command_line, CONFIG_CMDLINE, sizeof(command_line)); 280 #else 281 strlcpy(command_line, COMMAND_LINE, sizeof(command_line)); 282 #ifdef CONFIG_CMDLINE_EXTEND 283 strlcat(command_line, " ", sizeof(command_line)); 284 strlcat(command_line, CONFIG_CMDLINE, sizeof(command_line)); 285 #endif 286 #endif 287 288 /* Save unparsed command line copy for /proc/cmdline */ 289 memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE); 290 *cmdline_p = command_line; 291 292 parse_early_param(); 293 294 plat_early_device_setup(); 295 296 sh_mv_setup(); 297 298 /* Let earlyprintk output early console messages */ 299 early_platform_driver_probe("earlyprintk", 1, 1); 300 301 paging_init(); 302 303 #ifdef CONFIG_DUMMY_CONSOLE 304 conswitchp = &dummy_con; 305 #endif 306 307 /* Perform the machine specific initialisation */ 308 if (likely(sh_mv.mv_setup)) 309 sh_mv.mv_setup(cmdline_p); 310 311 plat_smp_setup(); 312 } 313 314 /* processor boot mode configuration */ 315 int generic_mode_pins(void) 316 { 317 pr_warning("generic_mode_pins(): missing mode pin configuration\n"); 318 return 0; 319 } 320 321 int test_mode_pin(int pin) 322 { 323 return sh_mv.mv_mode_pins() & pin; 324 } 325