1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * arch/sh/kernel/setup.c 4 * 5 * This file handles the architecture-dependent parts of initialization 6 * 7 * Copyright (C) 1999 Niibe Yutaka 8 * Copyright (C) 2002 - 2010 Paul Mundt 9 */ 10 #include <linux/screen_info.h> 11 #include <linux/ioport.h> 12 #include <linux/init.h> 13 #include <linux/initrd.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 <linux/of.h> 33 #include <linux/of_fdt.h> 34 #include <linux/uaccess.h> 35 #include <uapi/linux/mount.h> 36 #include <asm/io.h> 37 #include <asm/page.h> 38 #include <asm/elf.h> 39 #include <asm/sections.h> 40 #include <asm/irq.h> 41 #include <asm/setup.h> 42 #include <asm/clock.h> 43 #include <asm/smp.h> 44 #include <asm/mmu_context.h> 45 #include <asm/mmzone.h> 46 #include <asm/processor.h> 47 #include <asm/sparsemem.h> 48 #include <asm/platform_early.h> 49 50 /* 51 * Initialize loops_per_jiffy as 10000000 (1000MIPS). 52 * This value will be used at the very early stage of serial setup. 53 * The bigger value means no problem. 54 */ 55 struct sh_cpuinfo cpu_data[NR_CPUS] __read_mostly = { 56 [0] = { 57 .type = CPU_SH_NONE, 58 .family = CPU_FAMILY_UNKNOWN, 59 .loops_per_jiffy = 10000000, 60 .phys_bits = MAX_PHYSMEM_BITS, 61 }, 62 }; 63 EXPORT_SYMBOL(cpu_data); 64 65 /* 66 * The machine vector. First entry in .machvec.init, or clobbered by 67 * sh_mv= on the command line, prior to .machvec.init teardown. 68 */ 69 struct sh_machine_vector sh_mv = { .mv_name = "generic", }; 70 EXPORT_SYMBOL(sh_mv); 71 72 #ifdef CONFIG_VT 73 struct screen_info screen_info; 74 #endif 75 76 extern int root_mountflags; 77 78 #define RAMDISK_IMAGE_START_MASK 0x07FF 79 #define RAMDISK_PROMPT_FLAG 0x8000 80 #define RAMDISK_LOAD_FLAG 0x4000 81 82 static char __initdata command_line[COMMAND_LINE_SIZE] = { 0, }; 83 84 static struct resource code_resource = { 85 .name = "Kernel code", 86 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 87 }; 88 89 static struct resource data_resource = { 90 .name = "Kernel data", 91 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 92 }; 93 94 static struct resource bss_resource = { 95 .name = "Kernel bss", 96 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 97 }; 98 99 unsigned long memory_start; 100 EXPORT_SYMBOL(memory_start); 101 unsigned long memory_end = 0; 102 EXPORT_SYMBOL(memory_end); 103 unsigned long memory_limit = 0; 104 105 static struct resource mem_resources[MAX_NUMNODES]; 106 107 int l1i_cache_shape, l1d_cache_shape, l2_cache_shape; 108 109 static int __init early_parse_mem(char *p) 110 { 111 if (!p) 112 return 1; 113 114 memory_limit = PAGE_ALIGN(memparse(p, &p)); 115 116 pr_notice("Memory limited to %ldMB\n", memory_limit >> 20); 117 118 return 0; 119 } 120 early_param("mem", early_parse_mem); 121 122 void __init check_for_initrd(void) 123 { 124 #ifdef CONFIG_BLK_DEV_INITRD 125 unsigned long start, end; 126 127 /* 128 * Check for the rare cases where boot loaders adhere to the boot 129 * ABI. 130 */ 131 if (!LOADER_TYPE || !INITRD_START || !INITRD_SIZE) 132 goto disable; 133 134 start = INITRD_START + __MEMORY_START; 135 end = start + INITRD_SIZE; 136 137 if (unlikely(end <= start)) 138 goto disable; 139 if (unlikely(start & ~PAGE_MASK)) { 140 pr_err("initrd must be page aligned\n"); 141 goto disable; 142 } 143 144 if (unlikely(start < __MEMORY_START)) { 145 pr_err("initrd start (%08lx) < __MEMORY_START(%x)\n", 146 start, __MEMORY_START); 147 goto disable; 148 } 149 150 if (unlikely(end > memblock_end_of_DRAM())) { 151 pr_err("initrd extends beyond end of memory " 152 "(0x%08lx > 0x%08lx)\ndisabling initrd\n", 153 end, (unsigned long)memblock_end_of_DRAM()); 154 goto disable; 155 } 156 157 /* 158 * If we got this far in spite of the boot loader's best efforts 159 * to the contrary, assume we actually have a valid initrd and 160 * fix up the root dev. 161 */ 162 ROOT_DEV = Root_RAM0; 163 164 /* 165 * Address sanitization 166 */ 167 initrd_start = (unsigned long)__va(start); 168 initrd_end = initrd_start + INITRD_SIZE; 169 170 memblock_reserve(__pa(initrd_start), INITRD_SIZE); 171 172 return; 173 174 disable: 175 pr_info("initrd disabled\n"); 176 initrd_start = initrd_end = 0; 177 #endif 178 } 179 180 #ifndef CONFIG_GENERIC_CALIBRATE_DELAY 181 void calibrate_delay(void) 182 { 183 struct clk *clk = clk_get(NULL, "cpu_clk"); 184 185 if (IS_ERR(clk)) 186 panic("Need a sane CPU clock definition!"); 187 188 loops_per_jiffy = (clk_get_rate(clk) >> 1) / HZ; 189 190 printk(KERN_INFO "Calibrating delay loop (skipped)... " 191 "%lu.%02lu BogoMIPS PRESET (lpj=%lu)\n", 192 loops_per_jiffy/(500000/HZ), 193 (loops_per_jiffy/(5000/HZ)) % 100, 194 loops_per_jiffy); 195 } 196 #endif 197 198 void __init __add_active_range(unsigned int nid, unsigned long start_pfn, 199 unsigned long end_pfn) 200 { 201 struct resource *res = &mem_resources[nid]; 202 unsigned long start, end; 203 204 WARN_ON(res->name); /* max one active range per node for now */ 205 206 start = start_pfn << PAGE_SHIFT; 207 end = end_pfn << PAGE_SHIFT; 208 209 res->name = "System RAM"; 210 res->start = start; 211 res->end = end - 1; 212 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; 213 214 if (request_resource(&iomem_resource, res)) { 215 pr_err("unable to request memory_resource 0x%lx 0x%lx\n", 216 start_pfn, end_pfn); 217 return; 218 } 219 220 /* 221 * We don't know which RAM region contains kernel data or 222 * the reserved crashkernel region, so try it repeatedly 223 * and let the resource manager test it. 224 */ 225 request_resource(res, &code_resource); 226 request_resource(res, &data_resource); 227 request_resource(res, &bss_resource); 228 #ifdef CONFIG_KEXEC 229 request_resource(res, &crashk_res); 230 #endif 231 232 /* 233 * Also make sure that there is a PMB mapping that covers this 234 * range before we attempt to activate it, to avoid reset by MMU. 235 * We can hit this path with NUMA or memory hot-add. 236 */ 237 pmb_bolt_mapping((unsigned long)__va(start), start, end - start, 238 PAGE_KERNEL); 239 240 memblock_set_node(PFN_PHYS(start_pfn), PFN_PHYS(end_pfn - start_pfn), 241 &memblock.memory, nid); 242 } 243 244 void __init __weak plat_early_device_setup(void) 245 { 246 } 247 248 #ifdef CONFIG_OF_EARLY_FLATTREE 249 void __ref sh_fdt_init(phys_addr_t dt_phys) 250 { 251 static int done = 0; 252 void *dt_virt; 253 254 /* Avoid calling an __init function on secondary cpus. */ 255 if (done) return; 256 257 #ifdef CONFIG_USE_BUILTIN_DTB 258 dt_virt = __dtb_start; 259 #else 260 dt_virt = phys_to_virt(dt_phys); 261 #endif 262 263 if (!dt_virt || !early_init_dt_scan(dt_virt)) { 264 pr_crit("Error: invalid device tree blob" 265 " at physical address %p\n", (void *)dt_phys); 266 267 while (true) 268 cpu_relax(); 269 } 270 271 done = 1; 272 } 273 #endif 274 275 void __init setup_arch(char **cmdline_p) 276 { 277 enable_mmu(); 278 279 ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV); 280 281 printk(KERN_NOTICE "Boot params:\n" 282 "... MOUNT_ROOT_RDONLY - %08lx\n" 283 "... RAMDISK_FLAGS - %08lx\n" 284 "... ORIG_ROOT_DEV - %08lx\n" 285 "... LOADER_TYPE - %08lx\n" 286 "... INITRD_START - %08lx\n" 287 "... INITRD_SIZE - %08lx\n", 288 MOUNT_ROOT_RDONLY, RAMDISK_FLAGS, 289 ORIG_ROOT_DEV, LOADER_TYPE, 290 INITRD_START, INITRD_SIZE); 291 292 #ifdef CONFIG_BLK_DEV_RAM 293 rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK; 294 #endif 295 296 if (!MOUNT_ROOT_RDONLY) 297 root_mountflags &= ~MS_RDONLY; 298 setup_initial_init_mm(_text, _etext, _edata, _end); 299 300 code_resource.start = virt_to_phys(_text); 301 code_resource.end = virt_to_phys(_etext)-1; 302 data_resource.start = virt_to_phys(_etext); 303 data_resource.end = virt_to_phys(_edata)-1; 304 bss_resource.start = virt_to_phys(__bss_start); 305 bss_resource.end = virt_to_phys(__bss_stop)-1; 306 307 #ifdef CONFIG_CMDLINE_OVERWRITE 308 strscpy(command_line, CONFIG_CMDLINE, sizeof(command_line)); 309 #else 310 strscpy(command_line, COMMAND_LINE, sizeof(command_line)); 311 #ifdef CONFIG_CMDLINE_EXTEND 312 strlcat(command_line, " ", sizeof(command_line)); 313 strlcat(command_line, CONFIG_CMDLINE, sizeof(command_line)); 314 #endif 315 #endif 316 317 /* Save unparsed command line copy for /proc/cmdline */ 318 memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE); 319 *cmdline_p = command_line; 320 321 parse_early_param(); 322 323 plat_early_device_setup(); 324 325 sh_mv_setup(); 326 327 /* Let earlyprintk output early console messages */ 328 sh_early_platform_driver_probe("earlyprintk", 1, 1); 329 330 #ifdef CONFIG_OF_EARLY_FLATTREE 331 #ifdef CONFIG_USE_BUILTIN_DTB 332 unflatten_and_copy_device_tree(); 333 #else 334 unflatten_device_tree(); 335 #endif 336 #endif 337 338 paging_init(); 339 340 /* Perform the machine specific initialisation */ 341 if (likely(sh_mv.mv_setup)) 342 sh_mv.mv_setup(cmdline_p); 343 344 plat_smp_setup(); 345 } 346 347 /* processor boot mode configuration */ 348 int generic_mode_pins(void) 349 { 350 pr_warn("generic_mode_pins(): missing mode pin configuration\n"); 351 return 0; 352 } 353 354 int test_mode_pin(int pin) 355 { 356 return sh_mv.mv_mode_pins() & pin; 357 } 358 359 void __init arch_cpu_finalize_init(void) 360 { 361 char *p = &init_utsname()->machine[2]; /* "sh" */ 362 363 select_idle_routine(); 364 365 current_cpu_data.loops_per_jiffy = loops_per_jiffy; 366 367 switch (current_cpu_data.family) { 368 case CPU_FAMILY_SH2: 369 *p++ = '2'; 370 break; 371 case CPU_FAMILY_SH2A: 372 *p++ = '2'; 373 *p++ = 'a'; 374 break; 375 case CPU_FAMILY_SH3: 376 *p++ = '3'; 377 break; 378 case CPU_FAMILY_SH4: 379 *p++ = '4'; 380 break; 381 case CPU_FAMILY_SH4A: 382 *p++ = '4'; 383 *p++ = 'a'; 384 break; 385 case CPU_FAMILY_SH4AL_DSP: 386 *p++ = '4'; 387 *p++ = 'a'; 388 *p++ = 'l'; 389 *p++ = '-'; 390 *p++ = 'd'; 391 *p++ = 's'; 392 *p++ = 'p'; 393 break; 394 case CPU_FAMILY_UNKNOWN: 395 /* 396 * Specifically use CPU_FAMILY_UNKNOWN rather than 397 * default:, so we're able to have the compiler whine 398 * about unhandled enumerations. 399 */ 400 break; 401 } 402 403 pr_info("CPU: %s\n", get_cpu_subtype(¤t_cpu_data)); 404 405 #ifndef __LITTLE_ENDIAN__ 406 /* 'eb' means 'Endian Big' */ 407 *p++ = 'e'; 408 *p++ = 'b'; 409 #endif 410 *p = '\0'; 411 } 412