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/bootmem.h> 15 #include <linux/console.h> 16 #include <linux/root_dev.h> 17 #include <linux/utsname.h> 18 #include <linux/nodemask.h> 19 #include <linux/cpu.h> 20 #include <linux/pfn.h> 21 #include <linux/fs.h> 22 #include <linux/mm.h> 23 #include <linux/kexec.h> 24 #include <linux/module.h> 25 #include <linux/smp.h> 26 #include <linux/err.h> 27 #include <linux/crash_dump.h> 28 #include <linux/mmzone.h> 29 #include <linux/clk.h> 30 #include <linux/delay.h> 31 #include <linux/platform_device.h> 32 #include <linux/memblock.h> 33 #include <linux/of.h> 34 #include <linux/of_fdt.h> 35 #include <linux/uaccess.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/sparsemem.h> 47 48 /* 49 * Initialize loops_per_jiffy as 10000000 (1000MIPS). 50 * This value will be used at the very early stage of serial setup. 51 * The bigger value means no problem. 52 */ 53 struct sh_cpuinfo cpu_data[NR_CPUS] __read_mostly = { 54 [0] = { 55 .type = CPU_SH_NONE, 56 .family = CPU_FAMILY_UNKNOWN, 57 .loops_per_jiffy = 10000000, 58 .phys_bits = MAX_PHYSMEM_BITS, 59 }, 60 }; 61 EXPORT_SYMBOL(cpu_data); 62 63 /* 64 * The machine vector. First entry in .machvec.init, or clobbered by 65 * sh_mv= on the command line, prior to .machvec.init teardown. 66 */ 67 struct sh_machine_vector sh_mv = { .mv_name = "generic", }; 68 EXPORT_SYMBOL(sh_mv); 69 70 #ifdef CONFIG_VT 71 struct screen_info screen_info; 72 #endif 73 74 extern int root_mountflags; 75 76 #define RAMDISK_IMAGE_START_MASK 0x07FF 77 #define RAMDISK_PROMPT_FLAG 0x8000 78 #define RAMDISK_LOAD_FLAG 0x4000 79 80 static char __initdata command_line[COMMAND_LINE_SIZE] = { 0, }; 81 82 static struct resource code_resource = { 83 .name = "Kernel code", 84 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 85 }; 86 87 static struct resource data_resource = { 88 .name = "Kernel data", 89 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 90 }; 91 92 static struct resource bss_resource = { 93 .name = "Kernel bss", 94 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 95 }; 96 97 unsigned long memory_start; 98 EXPORT_SYMBOL(memory_start); 99 unsigned long memory_end = 0; 100 EXPORT_SYMBOL(memory_end); 101 unsigned long memory_limit = 0; 102 103 static struct resource mem_resources[MAX_NUMNODES]; 104 105 int l1i_cache_shape, l1d_cache_shape, l2_cache_shape; 106 107 static int __init early_parse_mem(char *p) 108 { 109 if (!p) 110 return 1; 111 112 memory_limit = PAGE_ALIGN(memparse(p, &p)); 113 114 pr_notice("Memory limited to %ldMB\n", memory_limit >> 20); 115 116 return 0; 117 } 118 early_param("mem", early_parse_mem); 119 120 void __init check_for_initrd(void) 121 { 122 #ifdef CONFIG_BLK_DEV_INITRD 123 unsigned long start, end; 124 125 /* 126 * Check for the rare cases where boot loaders adhere to the boot 127 * ABI. 128 */ 129 if (!LOADER_TYPE || !INITRD_START || !INITRD_SIZE) 130 goto disable; 131 132 start = INITRD_START + __MEMORY_START; 133 end = start + INITRD_SIZE; 134 135 if (unlikely(end <= start)) 136 goto disable; 137 if (unlikely(start & ~PAGE_MASK)) { 138 pr_err("initrd must be page aligned\n"); 139 goto disable; 140 } 141 142 if (unlikely(start < __MEMORY_START)) { 143 pr_err("initrd start (%08lx) < __MEMORY_START(%x)\n", 144 start, __MEMORY_START); 145 goto disable; 146 } 147 148 if (unlikely(end > memblock_end_of_DRAM())) { 149 pr_err("initrd extends beyond end of memory " 150 "(0x%08lx > 0x%08lx)\ndisabling initrd\n", 151 end, (unsigned long)memblock_end_of_DRAM()); 152 goto disable; 153 } 154 155 /* 156 * If we got this far in spite of the boot loader's best efforts 157 * to the contrary, assume we actually have a valid initrd and 158 * fix up the root dev. 159 */ 160 ROOT_DEV = Root_RAM0; 161 162 /* 163 * Address sanitization 164 */ 165 initrd_start = (unsigned long)__va(start); 166 initrd_end = initrd_start + INITRD_SIZE; 167 168 memblock_reserve(__pa(initrd_start), INITRD_SIZE); 169 170 return; 171 172 disable: 173 pr_info("initrd disabled\n"); 174 initrd_start = initrd_end = 0; 175 #endif 176 } 177 178 #ifndef CONFIG_GENERIC_CALIBRATE_DELAY 179 void calibrate_delay(void) 180 { 181 struct clk *clk = clk_get(NULL, "cpu_clk"); 182 183 if (IS_ERR(clk)) 184 panic("Need a sane CPU clock definition!"); 185 186 loops_per_jiffy = (clk_get_rate(clk) >> 1) / HZ; 187 188 printk(KERN_INFO "Calibrating delay loop (skipped)... " 189 "%lu.%02lu BogoMIPS PRESET (lpj=%lu)\n", 190 loops_per_jiffy/(500000/HZ), 191 (loops_per_jiffy/(5000/HZ)) % 100, 192 loops_per_jiffy); 193 } 194 #endif 195 196 void __init __add_active_range(unsigned int nid, unsigned long start_pfn, 197 unsigned long end_pfn) 198 { 199 struct resource *res = &mem_resources[nid]; 200 unsigned long start, end; 201 202 WARN_ON(res->name); /* max one active range per node for now */ 203 204 start = start_pfn << PAGE_SHIFT; 205 end = end_pfn << PAGE_SHIFT; 206 207 res->name = "System RAM"; 208 res->start = start; 209 res->end = end - 1; 210 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; 211 212 if (request_resource(&iomem_resource, res)) { 213 pr_err("unable to request memory_resource 0x%lx 0x%lx\n", 214 start_pfn, end_pfn); 215 return; 216 } 217 218 /* 219 * We don't know which RAM region contains kernel data or 220 * the reserved crashkernel region, so try it repeatedly 221 * and let the resource manager test it. 222 */ 223 request_resource(res, &code_resource); 224 request_resource(res, &data_resource); 225 request_resource(res, &bss_resource); 226 #ifdef CONFIG_KEXEC 227 request_resource(res, &crashk_res); 228 #endif 229 230 /* 231 * Also make sure that there is a PMB mapping that covers this 232 * range before we attempt to activate it, to avoid reset by MMU. 233 * We can hit this path with NUMA or memory hot-add. 234 */ 235 pmb_bolt_mapping((unsigned long)__va(start), start, end - start, 236 PAGE_KERNEL); 237 238 memblock_set_node(PFN_PHYS(start_pfn), PFN_PHYS(end_pfn - start_pfn), 239 &memblock.memory, nid); 240 } 241 242 void __init __weak plat_early_device_setup(void) 243 { 244 } 245 246 #ifdef CONFIG_OF_FLATTREE 247 void __ref sh_fdt_init(phys_addr_t dt_phys) 248 { 249 static int done = 0; 250 void *dt_virt; 251 252 /* Avoid calling an __init function on secondary cpus. */ 253 if (done) return; 254 255 #ifdef CONFIG_USE_BUILTIN_DTB 256 dt_virt = __dtb_start; 257 #else 258 dt_virt = phys_to_virt(dt_phys); 259 #endif 260 261 if (!dt_virt || !early_init_dt_scan(dt_virt)) { 262 pr_crit("Error: invalid device tree blob" 263 " at physical address %p\n", (void *)dt_phys); 264 265 while (true) 266 cpu_relax(); 267 } 268 269 done = 1; 270 } 271 #endif 272 273 void __init setup_arch(char **cmdline_p) 274 { 275 enable_mmu(); 276 277 ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV); 278 279 printk(KERN_NOTICE "Boot params:\n" 280 "... MOUNT_ROOT_RDONLY - %08lx\n" 281 "... RAMDISK_FLAGS - %08lx\n" 282 "... ORIG_ROOT_DEV - %08lx\n" 283 "... LOADER_TYPE - %08lx\n" 284 "... INITRD_START - %08lx\n" 285 "... INITRD_SIZE - %08lx\n", 286 MOUNT_ROOT_RDONLY, RAMDISK_FLAGS, 287 ORIG_ROOT_DEV, LOADER_TYPE, 288 INITRD_START, INITRD_SIZE); 289 290 #ifdef CONFIG_BLK_DEV_RAM 291 rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK; 292 rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0); 293 rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0); 294 #endif 295 296 if (!MOUNT_ROOT_RDONLY) 297 root_mountflags &= ~MS_RDONLY; 298 init_mm.start_code = (unsigned long) _text; 299 init_mm.end_code = (unsigned long) _etext; 300 init_mm.end_data = (unsigned long) _edata; 301 init_mm.brk = (unsigned long) _end; 302 303 code_resource.start = virt_to_phys(_text); 304 code_resource.end = virt_to_phys(_etext)-1; 305 data_resource.start = virt_to_phys(_etext); 306 data_resource.end = virt_to_phys(_edata)-1; 307 bss_resource.start = virt_to_phys(__bss_start); 308 bss_resource.end = virt_to_phys(__bss_stop)-1; 309 310 #ifdef CONFIG_CMDLINE_OVERWRITE 311 strlcpy(command_line, CONFIG_CMDLINE, sizeof(command_line)); 312 #else 313 strlcpy(command_line, COMMAND_LINE, sizeof(command_line)); 314 #ifdef CONFIG_CMDLINE_EXTEND 315 strlcat(command_line, " ", sizeof(command_line)); 316 strlcat(command_line, CONFIG_CMDLINE, sizeof(command_line)); 317 #endif 318 #endif 319 320 /* Save unparsed command line copy for /proc/cmdline */ 321 memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE); 322 *cmdline_p = command_line; 323 324 parse_early_param(); 325 326 plat_early_device_setup(); 327 328 sh_mv_setup(); 329 330 /* Let earlyprintk output early console messages */ 331 early_platform_driver_probe("earlyprintk", 1, 1); 332 333 #ifdef CONFIG_OF_FLATTREE 334 #ifdef CONFIG_USE_BUILTIN_DTB 335 unflatten_and_copy_device_tree(); 336 #else 337 unflatten_device_tree(); 338 #endif 339 #endif 340 341 paging_init(); 342 343 #ifdef CONFIG_DUMMY_CONSOLE 344 conswitchp = &dummy_con; 345 #endif 346 347 /* Perform the machine specific initialisation */ 348 if (likely(sh_mv.mv_setup)) 349 sh_mv.mv_setup(cmdline_p); 350 351 plat_smp_setup(); 352 } 353 354 /* processor boot mode configuration */ 355 int generic_mode_pins(void) 356 { 357 pr_warning("generic_mode_pins(): missing mode pin configuration\n"); 358 return 0; 359 } 360 361 int test_mode_pin(int pin) 362 { 363 return sh_mv.mv_mode_pins() & pin; 364 } 365