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/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 #ifdef CONFIG_VT 72 struct screen_info screen_info; 73 #endif 74 75 extern int root_mountflags; 76 77 #define RAMDISK_IMAGE_START_MASK 0x07FF 78 #define RAMDISK_PROMPT_FLAG 0x8000 79 #define RAMDISK_LOAD_FLAG 0x4000 80 81 static char __initdata command_line[COMMAND_LINE_SIZE] = { 0, }; 82 83 static struct resource code_resource = { 84 .name = "Kernel code", 85 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 86 }; 87 88 static struct resource data_resource = { 89 .name = "Kernel data", 90 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 91 }; 92 93 static struct resource bss_resource = { 94 .name = "Kernel bss", 95 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 96 }; 97 98 unsigned long memory_start; 99 EXPORT_SYMBOL(memory_start); 100 unsigned long memory_end = 0; 101 EXPORT_SYMBOL(memory_end); 102 unsigned long memory_limit = 0; 103 104 static struct resource mem_resources[MAX_NUMNODES]; 105 106 int l1i_cache_shape, l1d_cache_shape, l2_cache_shape; 107 108 static int __init early_parse_mem(char *p) 109 { 110 if (!p) 111 return 1; 112 113 memory_limit = PAGE_ALIGN(memparse(p, &p)); 114 115 pr_notice("Memory limited to %ldMB\n", memory_limit >> 20); 116 117 return 0; 118 } 119 early_param("mem", early_parse_mem); 120 121 void __init check_for_initrd(void) 122 { 123 #ifdef CONFIG_BLK_DEV_INITRD 124 unsigned long start, end; 125 126 /* 127 * Check for the rare cases where boot loaders adhere to the boot 128 * ABI. 129 */ 130 if (!LOADER_TYPE || !INITRD_START || !INITRD_SIZE) 131 goto disable; 132 133 start = INITRD_START + __MEMORY_START; 134 end = start + INITRD_SIZE; 135 136 if (unlikely(end <= start)) 137 goto disable; 138 if (unlikely(start & ~PAGE_MASK)) { 139 pr_err("initrd must be page aligned\n"); 140 goto disable; 141 } 142 143 if (unlikely(start < __MEMORY_START)) { 144 pr_err("initrd start (%08lx) < __MEMORY_START(%x)\n", 145 start, __MEMORY_START); 146 goto disable; 147 } 148 149 if (unlikely(end > memblock_end_of_DRAM())) { 150 pr_err("initrd extends beyond end of memory " 151 "(0x%08lx > 0x%08lx)\ndisabling initrd\n", 152 end, (unsigned long)memblock_end_of_DRAM()); 153 goto disable; 154 } 155 156 /* 157 * If we got this far in spite of the boot loader's best efforts 158 * to the contrary, assume we actually have a valid initrd and 159 * fix up the root dev. 160 */ 161 ROOT_DEV = Root_RAM0; 162 163 /* 164 * Address sanitization 165 */ 166 initrd_start = (unsigned long)__va(start); 167 initrd_end = initrd_start + INITRD_SIZE; 168 169 memblock_reserve(__pa(initrd_start), INITRD_SIZE); 170 171 return; 172 173 disable: 174 pr_info("initrd disabled\n"); 175 initrd_start = initrd_end = 0; 176 #endif 177 } 178 179 #ifndef CONFIG_GENERIC_CALIBRATE_DELAY 180 void calibrate_delay(void) 181 { 182 struct clk *clk = clk_get(NULL, "cpu_clk"); 183 184 if (IS_ERR(clk)) 185 panic("Need a sane CPU clock definition!"); 186 187 loops_per_jiffy = (clk_get_rate(clk) >> 1) / HZ; 188 189 printk(KERN_INFO "Calibrating delay loop (skipped)... " 190 "%lu.%02lu BogoMIPS PRESET (lpj=%lu)\n", 191 loops_per_jiffy/(500000/HZ), 192 (loops_per_jiffy/(5000/HZ)) % 100, 193 loops_per_jiffy); 194 } 195 #endif 196 197 void __init __add_active_range(unsigned int nid, unsigned long start_pfn, 198 unsigned long end_pfn) 199 { 200 struct resource *res = &mem_resources[nid]; 201 unsigned long start, end; 202 203 WARN_ON(res->name); /* max one active range per node for now */ 204 205 start = start_pfn << PAGE_SHIFT; 206 end = end_pfn << PAGE_SHIFT; 207 208 res->name = "System RAM"; 209 res->start = start; 210 res->end = end - 1; 211 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; 212 213 if (request_resource(&iomem_resource, res)) { 214 pr_err("unable to request memory_resource 0x%lx 0x%lx\n", 215 start_pfn, end_pfn); 216 return; 217 } 218 219 /* 220 * We don't know which RAM region contains kernel data or 221 * the reserved crashkernel region, so try it repeatedly 222 * and let the resource manager test it. 223 */ 224 request_resource(res, &code_resource); 225 request_resource(res, &data_resource); 226 request_resource(res, &bss_resource); 227 #ifdef CONFIG_KEXEC 228 request_resource(res, &crashk_res); 229 #endif 230 231 /* 232 * Also make sure that there is a PMB mapping that covers this 233 * range before we attempt to activate it, to avoid reset by MMU. 234 * We can hit this path with NUMA or memory hot-add. 235 */ 236 pmb_bolt_mapping((unsigned long)__va(start), start, end - start, 237 PAGE_KERNEL); 238 239 memblock_set_node(PFN_PHYS(start_pfn), PFN_PHYS(end_pfn - start_pfn), 240 &memblock.memory, nid); 241 } 242 243 void __init __weak plat_early_device_setup(void) 244 { 245 } 246 247 #ifdef CONFIG_OF_FLATTREE 248 void __ref sh_fdt_init(phys_addr_t dt_phys) 249 { 250 static int done = 0; 251 void *dt_virt; 252 253 /* Avoid calling an __init function on secondary cpus. */ 254 if (done) return; 255 256 #ifdef CONFIG_USE_BUILTIN_DTB 257 dt_virt = __dtb_start; 258 #else 259 dt_virt = phys_to_virt(dt_phys); 260 #endif 261 262 if (!dt_virt || !early_init_dt_scan(dt_virt)) { 263 pr_crit("Error: invalid device tree blob" 264 " at physical address %p\n", (void *)dt_phys); 265 266 while (true) 267 cpu_relax(); 268 } 269 270 done = 1; 271 } 272 #endif 273 274 void __init setup_arch(char **cmdline_p) 275 { 276 enable_mmu(); 277 278 ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV); 279 280 printk(KERN_NOTICE "Boot params:\n" 281 "... MOUNT_ROOT_RDONLY - %08lx\n" 282 "... RAMDISK_FLAGS - %08lx\n" 283 "... ORIG_ROOT_DEV - %08lx\n" 284 "... LOADER_TYPE - %08lx\n" 285 "... INITRD_START - %08lx\n" 286 "... INITRD_SIZE - %08lx\n", 287 MOUNT_ROOT_RDONLY, RAMDISK_FLAGS, 288 ORIG_ROOT_DEV, LOADER_TYPE, 289 INITRD_START, INITRD_SIZE); 290 291 #ifdef CONFIG_BLK_DEV_RAM 292 rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK; 293 #endif 294 295 if (!MOUNT_ROOT_RDONLY) 296 root_mountflags &= ~MS_RDONLY; 297 setup_initial_init_mm(_text, _etext, _edata, _end); 298 299 code_resource.start = virt_to_phys(_text); 300 code_resource.end = virt_to_phys(_etext)-1; 301 data_resource.start = virt_to_phys(_etext); 302 data_resource.end = virt_to_phys(_edata)-1; 303 bss_resource.start = virt_to_phys(__bss_start); 304 bss_resource.end = virt_to_phys(__bss_stop)-1; 305 306 #ifdef CONFIG_CMDLINE_OVERWRITE 307 strlcpy(command_line, CONFIG_CMDLINE, sizeof(command_line)); 308 #else 309 strlcpy(command_line, COMMAND_LINE, sizeof(command_line)); 310 #ifdef CONFIG_CMDLINE_EXTEND 311 strlcat(command_line, " ", sizeof(command_line)); 312 strlcat(command_line, CONFIG_CMDLINE, sizeof(command_line)); 313 #endif 314 #endif 315 316 /* Save unparsed command line copy for /proc/cmdline */ 317 memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE); 318 *cmdline_p = command_line; 319 320 parse_early_param(); 321 322 plat_early_device_setup(); 323 324 sh_mv_setup(); 325 326 /* Let earlyprintk output early console messages */ 327 sh_early_platform_driver_probe("earlyprintk", 1, 1); 328 329 #ifdef CONFIG_OF_FLATTREE 330 #ifdef CONFIG_USE_BUILTIN_DTB 331 unflatten_and_copy_device_tree(); 332 #else 333 unflatten_device_tree(); 334 #endif 335 #endif 336 337 paging_init(); 338 339 /* Perform the machine specific initialisation */ 340 if (likely(sh_mv.mv_setup)) 341 sh_mv.mv_setup(cmdline_p); 342 343 plat_smp_setup(); 344 } 345 346 /* processor boot mode configuration */ 347 int generic_mode_pins(void) 348 { 349 pr_warn("generic_mode_pins(): missing mode pin configuration\n"); 350 return 0; 351 } 352 353 int test_mode_pin(int pin) 354 { 355 return sh_mv.mv_mode_pins() & pin; 356 } 357