arch/sh/kernel/setup.c

   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/processor.h>
  47 #include <asm/sparsemem.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         rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
 294         rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
 295 #endif
 296
 297         if (!MOUNT_ROOT_RDONLY)
 298                 root_mountflags &= ~MS_RDONLY;
 299         init_mm.start_code = (unsigned long) _text;
 300         init_mm.end_code = (unsigned long) _etext;
 301         init_mm.end_data = (unsigned long) _edata;
 302         init_mm.brk = (unsigned long) _end;
 303
 304         code_resource.start = virt_to_phys(_text);
 305         code_resource.end = virt_to_phys(_etext)-1;
 306         data_resource.start = virt_to_phys(_etext);
 307         data_resource.end = virt_to_phys(_edata)-1;
 308         bss_resource.start = virt_to_phys(__bss_start);
 309         bss_resource.end = virt_to_phys(__bss_stop)-1;
 310
 311 #ifdef CONFIG_CMDLINE_OVERWRITE
 312         strlcpy(command_line, CONFIG_CMDLINE, sizeof(command_line));
 313 #else
 314         strlcpy(command_line, COMMAND_LINE, sizeof(command_line));
 315 #ifdef CONFIG_CMDLINE_EXTEND
 316         strlcat(command_line, " ", sizeof(command_line));
 317         strlcat(command_line, CONFIG_CMDLINE, sizeof(command_line));
 318 #endif
 319 #endif
 320
 321         /* Save unparsed command line copy for /proc/cmdline */
 322         memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
 323         *cmdline_p = command_line;
 324
 325         parse_early_param();
 326
 327         plat_early_device_setup();
 328
 329         sh_mv_setup();
 330
 331         /* Let earlyprintk output early console messages */
 332         early_platform_driver_probe("earlyprintk", 1, 1);
 333
 334         paging_init();
 335
 336 #ifdef CONFIG_DUMMY_CONSOLE
 337         conswitchp = &dummy_con;
 338 #endif
 339
 340         /* Perform the machine specific initialisation */
 341         if (likely(sh_mv.mv_setup))
 342                 sh_mv.mv_setup(cmdline_p);
 343
 344         plat_smp_setup();
 345 }
 346
 347 /* processor boot mode configuration */
 348 int generic_mode_pins(void)
 349 {
 350         pr_warning("generic_mode_pins(): missing mode pin configuration\n");
 351         return 0;
 352 }
 353
 354 int test_mode_pin(int pin)
 355 {
 356         return sh_mv.mv_mode_pins() & pin;
 357 }
 358
 359 void __init arch_cpu_finalize_init(void)
 360 {
 361         char *p = &init_utsname()->machine[2]; /* "sh" */
 362
 363         select_idle_routine();
 364
 365         current_cpu_data.loops_per_jiffy = loops_per_jiffy;
 366
 367         switch (current_cpu_data.family) {
 368         case CPU_FAMILY_SH2:
 369                 *p++ = '2';
 370                 break;
 371         case CPU_FAMILY_SH2A:
 372                 *p++ = '2';
 373                 *p++ = 'a';
 374                 break;
 375         case CPU_FAMILY_SH3:
 376                 *p++ = '3';
 377                 break;
 378         case CPU_FAMILY_SH4:
 379                 *p++ = '4';
 380                 break;
 381         case CPU_FAMILY_SH4A:
 382                 *p++ = '4';
 383                 *p++ = 'a';
 384                 break;
 385         case CPU_FAMILY_SH4AL_DSP:
 386                 *p++ = '4';
 387                 *p++ = 'a';
 388                 *p++ = 'l';
 389                 *p++ = '-';
 390                 *p++ = 'd';
 391                 *p++ = 's';
 392                 *p++ = 'p';
 393                 break;
 394         case CPU_FAMILY_UNKNOWN:
 395                 /*
 396                  * Specifically use CPU_FAMILY_UNKNOWN rather than
 397                  * default:, so we're able to have the compiler whine
 398                  * about unhandled enumerations.
 399                  */
 400                 break;
 401         }
 402
 403         pr_info("CPU: %s\n", get_cpu_subtype(&current_cpu_data));
 404
 405 #ifndef __LITTLE_ENDIAN__
 406         /* 'eb' means 'Endian Big' */
 407         *p++ = 'e';
 408         *p++ = 'b';
 409 #endif
 410         *p = '\0';
 411 }