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/clk.h> 27 #include <linux/delay.h> 28 #include <linux/platform_device.h> 29 #include <linux/memblock.h> 30 #include <linux/of.h> 31 #include <linux/of_fdt.h> 32 #include <linux/uaccess.h> 33 #include <uapi/linux/mount.h> 34 #include <asm/io.h> 35 #include <asm/page.h> 36 #include <asm/elf.h> 37 #include <asm/sections.h> 38 #include <asm/irq.h> 39 #include <asm/setup.h> 40 #include <asm/clock.h> 41 #include <asm/smp.h> 42 #include <asm/mmu_context.h> 43 #include <asm/processor.h> 44 #include <asm/platform_early.h> 45 46 /* 47 * Initialize loops_per_jiffy as 10000000 (1000MIPS). 48 * This value will be used at the very early stage of serial setup. 49 * The bigger value means no problem. 50 */ 51 struct sh_cpuinfo cpu_data[NR_CPUS] __read_mostly = { 52 [0] = { 53 .type = CPU_SH_NONE, 54 .family = CPU_FAMILY_UNKNOWN, 55 .loops_per_jiffy = 10000000, 56 .phys_bits = MAX_PHYSMEM_BITS, 57 }, 58 }; 59 EXPORT_SYMBOL(cpu_data); 60 61 /* 62 * The machine vector. First entry in .machvec.init, or clobbered by 63 * sh_mv= on the command line, prior to .machvec.init teardown. 64 */ 65 struct sh_machine_vector sh_mv = { .mv_name = "generic", }; 66 EXPORT_SYMBOL(sh_mv); 67 68 extern int root_mountflags; 69 70 #define RAMDISK_IMAGE_START_MASK 0x07FF 71 #define RAMDISK_PROMPT_FLAG 0x8000 72 #define RAMDISK_LOAD_FLAG 0x4000 73 74 static char __initdata command_line[COMMAND_LINE_SIZE] = { 0, }; 75 76 static struct resource code_resource = { 77 .name = "Kernel code", 78 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 79 }; 80 81 static struct resource data_resource = { 82 .name = "Kernel data", 83 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 84 }; 85 86 static struct resource bss_resource = { 87 .name = "Kernel bss", 88 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 89 }; 90 91 unsigned long memory_start; 92 EXPORT_SYMBOL(memory_start); 93 unsigned long memory_end = 0; 94 EXPORT_SYMBOL(memory_end); 95 unsigned long memory_limit = 0; 96 97 static struct resource mem_resources[MAX_NUMNODES]; 98 99 int l1i_cache_shape, l1d_cache_shape, l2_cache_shape; 100 101 static int __init early_parse_mem(char *p) 102 { 103 if (!p) 104 return 1; 105 106 memory_limit = PAGE_ALIGN(memparse(p, &p)); 107 108 pr_notice("Memory limited to %ldMB\n", memory_limit >> 20); 109 110 return 0; 111 } 112 early_param("mem", early_parse_mem); 113 114 void __init check_for_initrd(void) 115 { 116 #ifdef CONFIG_BLK_DEV_INITRD 117 unsigned long start, end; 118 119 /* 120 * Check for the rare cases where boot loaders adhere to the boot 121 * ABI. 122 */ 123 if (!LOADER_TYPE || !INITRD_START || !INITRD_SIZE) 124 goto disable; 125 126 start = INITRD_START + __MEMORY_START; 127 end = start + INITRD_SIZE; 128 129 if (unlikely(end <= start)) 130 goto disable; 131 if (unlikely(start & ~PAGE_MASK)) { 132 pr_err("initrd must be page aligned\n"); 133 goto disable; 134 } 135 136 if (unlikely(start < __MEMORY_START)) { 137 pr_err("initrd start (%08lx) < __MEMORY_START(%x)\n", 138 start, __MEMORY_START); 139 goto disable; 140 } 141 142 if (unlikely(end > memblock_end_of_DRAM())) { 143 pr_err("initrd extends beyond end of memory " 144 "(0x%08lx > 0x%08lx)\ndisabling initrd\n", 145 end, (unsigned long)memblock_end_of_DRAM()); 146 goto disable; 147 } 148 149 /* 150 * If we got this far in spite of the boot loader's best efforts 151 * to the contrary, assume we actually have a valid initrd and 152 * fix up the root dev. 153 */ 154 ROOT_DEV = Root_RAM0; 155 156 /* 157 * Address sanitization 158 */ 159 initrd_start = (unsigned long)__va(start); 160 initrd_end = initrd_start + INITRD_SIZE; 161 162 memblock_reserve(__pa(initrd_start), INITRD_SIZE); 163 164 return; 165 166 disable: 167 pr_info("initrd disabled\n"); 168 initrd_start = initrd_end = 0; 169 #endif 170 } 171 172 #ifndef CONFIG_GENERIC_CALIBRATE_DELAY 173 void calibrate_delay(void) 174 { 175 struct clk *clk = clk_get(NULL, "cpu_clk"); 176 177 if (IS_ERR(clk)) 178 panic("Need a sane CPU clock definition!"); 179 180 loops_per_jiffy = (clk_get_rate(clk) >> 1) / HZ; 181 182 printk(KERN_INFO "Calibrating delay loop (skipped)... " 183 "%lu.%02lu BogoMIPS PRESET (lpj=%lu)\n", 184 loops_per_jiffy/(500000/HZ), 185 (loops_per_jiffy/(5000/HZ)) % 100, 186 loops_per_jiffy); 187 } 188 #endif 189 190 void __init __add_active_range(unsigned int nid, unsigned long start_pfn, 191 unsigned long end_pfn) 192 { 193 struct resource *res = &mem_resources[nid]; 194 unsigned long start, end; 195 196 WARN_ON(res->name); /* max one active range per node for now */ 197 198 start = start_pfn << PAGE_SHIFT; 199 end = end_pfn << PAGE_SHIFT; 200 201 res->name = "System RAM"; 202 res->start = start; 203 res->end = end - 1; 204 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; 205 206 if (request_resource(&iomem_resource, res)) { 207 pr_err("unable to request memory_resource 0x%lx 0x%lx\n", 208 start_pfn, end_pfn); 209 return; 210 } 211 212 /* 213 * We don't know which RAM region contains kernel data or 214 * the reserved crashkernel region, so try it repeatedly 215 * and let the resource manager test it. 216 */ 217 request_resource(res, &code_resource); 218 request_resource(res, &data_resource); 219 request_resource(res, &bss_resource); 220 #ifdef CONFIG_CRASH_RESERVE 221 request_resource(res, &crashk_res); 222 #endif 223 224 /* 225 * Also make sure that there is a PMB mapping that covers this 226 * range before we attempt to activate it, to avoid reset by MMU. 227 */ 228 pmb_bolt_mapping((unsigned long)__va(start), start, end - start, 229 PAGE_KERNEL); 230 } 231 232 void __init __weak plat_early_device_setup(void) 233 { 234 } 235 236 #ifdef CONFIG_OF_EARLY_FLATTREE 237 void __ref sh_fdt_init(phys_addr_t dt_phys) 238 { 239 static int done = 0; 240 void *dt_virt; 241 242 /* Avoid calling an __init function on secondary cpus. */ 243 if (done) return; 244 245 #ifdef CONFIG_BUILTIN_DTB 246 dt_virt = __dtb_start; 247 #else 248 dt_virt = phys_to_virt(dt_phys); 249 #endif 250 251 if (!dt_virt || !early_init_dt_scan(dt_virt, __pa(dt_virt))) { 252 pr_crit("Error: invalid device tree blob" 253 " at physical address %p\n", (void *)dt_phys); 254 255 while (true) 256 cpu_relax(); 257 } 258 259 done = 1; 260 } 261 #endif 262 263 void __init setup_arch(char **cmdline_p) 264 { 265 enable_mmu(); 266 267 ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV); 268 269 printk(KERN_NOTICE "Boot params:\n" 270 "... MOUNT_ROOT_RDONLY - %08lx\n" 271 "... RAMDISK_FLAGS - %08lx\n" 272 "... ORIG_ROOT_DEV - %08lx\n" 273 "... LOADER_TYPE - %08lx\n" 274 "... INITRD_START - %08lx\n" 275 "... INITRD_SIZE - %08lx\n", 276 MOUNT_ROOT_RDONLY, RAMDISK_FLAGS, 277 ORIG_ROOT_DEV, LOADER_TYPE, 278 INITRD_START, INITRD_SIZE); 279 280 #ifdef CONFIG_BLK_DEV_RAM 281 rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK; 282 #endif 283 284 if (!MOUNT_ROOT_RDONLY) 285 root_mountflags &= ~MS_RDONLY; 286 setup_initial_init_mm(_text, _etext, _edata, _end); 287 288 code_resource.start = virt_to_phys(_text); 289 code_resource.end = virt_to_phys(_etext)-1; 290 data_resource.start = virt_to_phys(_etext); 291 data_resource.end = virt_to_phys(_edata)-1; 292 bss_resource.start = virt_to_phys(__bss_start); 293 bss_resource.end = virt_to_phys(__bss_stop)-1; 294 295 #ifdef CONFIG_CMDLINE_OVERWRITE 296 strscpy(command_line, CONFIG_CMDLINE, sizeof(command_line)); 297 #else 298 strscpy(command_line, COMMAND_LINE, sizeof(command_line)); 299 #ifdef CONFIG_CMDLINE_EXTEND 300 strlcat(command_line, " ", sizeof(command_line)); 301 strlcat(command_line, CONFIG_CMDLINE, sizeof(command_line)); 302 #endif 303 #endif 304 305 /* Save unparsed command line copy for /proc/cmdline */ 306 memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE); 307 *cmdline_p = command_line; 308 309 parse_early_param(); 310 311 plat_early_device_setup(); 312 313 sh_mv_setup(); 314 315 /* Let earlyprintk output early console messages */ 316 sh_early_platform_driver_probe("earlyprintk", 1, 1); 317 318 #ifdef CONFIG_OF_EARLY_FLATTREE 319 #ifdef CONFIG_BUILTIN_DTB 320 unflatten_and_copy_device_tree(); 321 #else 322 unflatten_device_tree(); 323 #endif 324 #endif 325 326 paging_init(); 327 328 /* Perform the machine specific initialisation */ 329 if (likely(sh_mv.mv_setup)) 330 sh_mv.mv_setup(cmdline_p); 331 332 plat_smp_setup(); 333 } 334 335 /* processor boot mode configuration */ 336 int generic_mode_pins(void) 337 { 338 pr_warn("generic_mode_pins(): missing mode pin configuration\n"); 339 return 0; 340 } 341 342 int test_mode_pin(int pin) 343 { 344 return sh_mv.mv_mode_pins() & pin; 345 } 346 347 void __init arch_cpu_finalize_init(void) 348 { 349 char *p = &init_utsname()->machine[2]; /* "sh" */ 350 351 select_idle_routine(); 352 353 current_cpu_data.loops_per_jiffy = loops_per_jiffy; 354 355 switch (current_cpu_data.family) { 356 case CPU_FAMILY_SH2: 357 *p++ = '2'; 358 break; 359 case CPU_FAMILY_SH2A: 360 *p++ = '2'; 361 *p++ = 'a'; 362 break; 363 case CPU_FAMILY_SH3: 364 *p++ = '3'; 365 break; 366 case CPU_FAMILY_SH4: 367 *p++ = '4'; 368 break; 369 case CPU_FAMILY_SH4A: 370 *p++ = '4'; 371 *p++ = 'a'; 372 break; 373 case CPU_FAMILY_SH4AL_DSP: 374 *p++ = '4'; 375 *p++ = 'a'; 376 *p++ = 'l'; 377 *p++ = '-'; 378 *p++ = 'd'; 379 *p++ = 's'; 380 *p++ = 'p'; 381 break; 382 case CPU_FAMILY_UNKNOWN: 383 /* 384 * Specifically use CPU_FAMILY_UNKNOWN rather than 385 * default:, so we're able to have the compiler whine 386 * about unhandled enumerations. 387 */ 388 break; 389 } 390 391 pr_info("CPU: %s\n", get_cpu_subtype(¤t_cpu_data)); 392 393 #ifndef __LITTLE_ENDIAN__ 394 /* 'eb' means 'Endian Big' */ 395 *p++ = 'e'; 396 *p++ = 'b'; 397 #endif 398 *p = '\0'; 399 } 400