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/ioport.h> 11 #include <linux/init.h> 12 #include <linux/initrd.h> 13 #include <linux/console.h> 14 #include <linux/root_dev.h> 15 #include <linux/utsname.h> 16 #include <linux/nodemask.h> 17 #include <linux/cpu.h> 18 #include <linux/pfn.h> 19 #include <linux/fs.h> 20 #include <linux/mm.h> 21 #include <linux/kexec.h> 22 #include <linux/module.h> 23 #include <linux/smp.h> 24 #include <linux/err.h> 25 #include <linux/crash_dump.h> 26 #include <linux/mmzone.h> 27 #include <linux/clk.h> 28 #include <linux/delay.h> 29 #include <linux/platform_device.h> 30 #include <linux/memblock.h> 31 #include <linux/of.h> 32 #include <linux/of_fdt.h> 33 #include <linux/uaccess.h> 34 #include <uapi/linux/mount.h> 35 #include <asm/io.h> 36 #include <asm/page.h> 37 #include <asm/elf.h> 38 #include <asm/sections.h> 39 #include <asm/irq.h> 40 #include <asm/setup.h> 41 #include <asm/clock.h> 42 #include <asm/smp.h> 43 #include <asm/mmu_context.h> 44 #include <asm/mmzone.h> 45 #include <asm/processor.h> 46 #include <asm/sparsemem.h> 47 #include <asm/platform_early.h> 48 49 /* 50 * Initialize loops_per_jiffy as 10000000 (1000MIPS). 51 * This value will be used at the very early stage of serial setup. 52 * The bigger value means no problem. 53 */ 54 struct sh_cpuinfo cpu_data[NR_CPUS] __read_mostly = { 55 [0] = { 56 .type = CPU_SH_NONE, 57 .family = CPU_FAMILY_UNKNOWN, 58 .loops_per_jiffy = 10000000, 59 .phys_bits = MAX_PHYSMEM_BITS, 60 }, 61 }; 62 EXPORT_SYMBOL(cpu_data); 63 64 /* 65 * The machine vector. First entry in .machvec.init, or clobbered by 66 * sh_mv= on the command line, prior to .machvec.init teardown. 67 */ 68 struct sh_machine_vector sh_mv = { .mv_name = "generic", }; 69 EXPORT_SYMBOL(sh_mv); 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_SYSTEM_RAM, 82 }; 83 84 static struct resource data_resource = { 85 .name = "Kernel data", 86 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 87 }; 88 89 static struct resource bss_resource = { 90 .name = "Kernel bss", 91 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 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 #ifndef CONFIG_GENERIC_CALIBRATE_DELAY 176 void calibrate_delay(void) 177 { 178 struct clk *clk = clk_get(NULL, "cpu_clk"); 179 180 if (IS_ERR(clk)) 181 panic("Need a sane CPU clock definition!"); 182 183 loops_per_jiffy = (clk_get_rate(clk) >> 1) / HZ; 184 185 printk(KERN_INFO "Calibrating delay loop (skipped)... " 186 "%lu.%02lu BogoMIPS PRESET (lpj=%lu)\n", 187 loops_per_jiffy/(500000/HZ), 188 (loops_per_jiffy/(5000/HZ)) % 100, 189 loops_per_jiffy); 190 } 191 #endif 192 193 void __init __add_active_range(unsigned int nid, unsigned long start_pfn, 194 unsigned long end_pfn) 195 { 196 struct resource *res = &mem_resources[nid]; 197 unsigned long start, end; 198 199 WARN_ON(res->name); /* max one active range per node for now */ 200 201 start = start_pfn << PAGE_SHIFT; 202 end = end_pfn << PAGE_SHIFT; 203 204 res->name = "System RAM"; 205 res->start = start; 206 res->end = end - 1; 207 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; 208 209 if (request_resource(&iomem_resource, res)) { 210 pr_err("unable to request memory_resource 0x%lx 0x%lx\n", 211 start_pfn, end_pfn); 212 return; 213 } 214 215 /* 216 * We don't know which RAM region contains kernel data or 217 * the reserved crashkernel region, so try it repeatedly 218 * and let the resource manager test it. 219 */ 220 request_resource(res, &code_resource); 221 request_resource(res, &data_resource); 222 request_resource(res, &bss_resource); 223 #ifdef CONFIG_KEXEC 224 request_resource(res, &crashk_res); 225 #endif 226 227 /* 228 * Also make sure that there is a PMB mapping that covers this 229 * range before we attempt to activate it, to avoid reset by MMU. 230 * We can hit this path with NUMA or memory hot-add. 231 */ 232 pmb_bolt_mapping((unsigned long)__va(start), start, end - start, 233 PAGE_KERNEL); 234 235 memblock_set_node(PFN_PHYS(start_pfn), PFN_PHYS(end_pfn - start_pfn), 236 &memblock.memory, nid); 237 } 238 239 void __init __weak plat_early_device_setup(void) 240 { 241 } 242 243 #ifdef CONFIG_OF_EARLY_FLATTREE 244 void __ref sh_fdt_init(phys_addr_t dt_phys) 245 { 246 static int done = 0; 247 void *dt_virt; 248 249 /* Avoid calling an __init function on secondary cpus. */ 250 if (done) return; 251 252 #ifdef CONFIG_USE_BUILTIN_DTB 253 dt_virt = __dtb_start; 254 #else 255 dt_virt = phys_to_virt(dt_phys); 256 #endif 257 258 if (!dt_virt || !early_init_dt_scan(dt_virt)) { 259 pr_crit("Error: invalid device tree blob" 260 " at physical address %p\n", (void *)dt_phys); 261 262 while (true) 263 cpu_relax(); 264 } 265 266 done = 1; 267 } 268 #endif 269 270 void __init setup_arch(char **cmdline_p) 271 { 272 enable_mmu(); 273 274 ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV); 275 276 printk(KERN_NOTICE "Boot params:\n" 277 "... MOUNT_ROOT_RDONLY - %08lx\n" 278 "... RAMDISK_FLAGS - %08lx\n" 279 "... ORIG_ROOT_DEV - %08lx\n" 280 "... LOADER_TYPE - %08lx\n" 281 "... INITRD_START - %08lx\n" 282 "... INITRD_SIZE - %08lx\n", 283 MOUNT_ROOT_RDONLY, RAMDISK_FLAGS, 284 ORIG_ROOT_DEV, LOADER_TYPE, 285 INITRD_START, INITRD_SIZE); 286 287 #ifdef CONFIG_BLK_DEV_RAM 288 rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK; 289 #endif 290 291 if (!MOUNT_ROOT_RDONLY) 292 root_mountflags &= ~MS_RDONLY; 293 setup_initial_init_mm(_text, _etext, _edata, _end); 294 295 code_resource.start = virt_to_phys(_text); 296 code_resource.end = virt_to_phys(_etext)-1; 297 data_resource.start = virt_to_phys(_etext); 298 data_resource.end = virt_to_phys(_edata)-1; 299 bss_resource.start = virt_to_phys(__bss_start); 300 bss_resource.end = virt_to_phys(__bss_stop)-1; 301 302 #ifdef CONFIG_CMDLINE_OVERWRITE 303 strscpy(command_line, CONFIG_CMDLINE, sizeof(command_line)); 304 #else 305 strscpy(command_line, COMMAND_LINE, sizeof(command_line)); 306 #ifdef CONFIG_CMDLINE_EXTEND 307 strlcat(command_line, " ", sizeof(command_line)); 308 strlcat(command_line, CONFIG_CMDLINE, sizeof(command_line)); 309 #endif 310 #endif 311 312 /* Save unparsed command line copy for /proc/cmdline */ 313 memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE); 314 *cmdline_p = command_line; 315 316 parse_early_param(); 317 318 plat_early_device_setup(); 319 320 sh_mv_setup(); 321 322 /* Let earlyprintk output early console messages */ 323 sh_early_platform_driver_probe("earlyprintk", 1, 1); 324 325 #ifdef CONFIG_OF_EARLY_FLATTREE 326 #ifdef CONFIG_USE_BUILTIN_DTB 327 unflatten_and_copy_device_tree(); 328 #else 329 unflatten_device_tree(); 330 #endif 331 #endif 332 333 paging_init(); 334 335 /* Perform the machine specific initialisation */ 336 if (likely(sh_mv.mv_setup)) 337 sh_mv.mv_setup(cmdline_p); 338 339 plat_smp_setup(); 340 } 341 342 /* processor boot mode configuration */ 343 int generic_mode_pins(void) 344 { 345 pr_warn("generic_mode_pins(): missing mode pin configuration\n"); 346 return 0; 347 } 348 349 int test_mode_pin(int pin) 350 { 351 return sh_mv.mv_mode_pins() & pin; 352 } 353 354 void __init arch_cpu_finalize_init(void) 355 { 356 char *p = &init_utsname()->machine[2]; /* "sh" */ 357 358 select_idle_routine(); 359 360 current_cpu_data.loops_per_jiffy = loops_per_jiffy; 361 362 switch (current_cpu_data.family) { 363 case CPU_FAMILY_SH2: 364 *p++ = '2'; 365 break; 366 case CPU_FAMILY_SH2A: 367 *p++ = '2'; 368 *p++ = 'a'; 369 break; 370 case CPU_FAMILY_SH3: 371 *p++ = '3'; 372 break; 373 case CPU_FAMILY_SH4: 374 *p++ = '4'; 375 break; 376 case CPU_FAMILY_SH4A: 377 *p++ = '4'; 378 *p++ = 'a'; 379 break; 380 case CPU_FAMILY_SH4AL_DSP: 381 *p++ = '4'; 382 *p++ = 'a'; 383 *p++ = 'l'; 384 *p++ = '-'; 385 *p++ = 'd'; 386 *p++ = 's'; 387 *p++ = 'p'; 388 break; 389 case CPU_FAMILY_UNKNOWN: 390 /* 391 * Specifically use CPU_FAMILY_UNKNOWN rather than 392 * default:, so we're able to have the compiler whine 393 * about unhandled enumerations. 394 */ 395 break; 396 } 397 398 pr_info("CPU: %s\n", get_cpu_subtype(¤t_cpu_data)); 399 400 #ifndef __LITTLE_ENDIAN__ 401 /* 'eb' means 'Endian Big' */ 402 *p++ = 'e'; 403 *p++ = 'b'; 404 #endif 405 *p = '\0'; 406 } 407