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