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