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/ioport.h>
  11 #include <linux/init.h>
  12 #include <linux/initrd.h>
  13 #include <linux/console.h>
  14 #include <linux/root_dev.h>
  15 #include <linux/utsname.h>
  16 #include <linux/nodemask.h>
  17 #include <linux/cpu.h>
  18 #include <linux/pfn.h>
  19 #include <linux/fs.h>
  20 #include <linux/mm.h>
  21 #include <linux/kexec.h>
  22 #include <linux/module.h>
  23 #include <linux/smp.h>
  24 #include <linux/err.h>
  25 #include <linux/crash_dump.h>
  26 #include <linux/mmzone.h>
  27 #include <linux/clk.h>
  28 #include <linux/delay.h>
  29 #include <linux/platform_device.h>
  30 #include <linux/memblock.h>
  31 #include <linux/of.h>
  32 #include <linux/of_fdt.h>
  33 #include <linux/uaccess.h>
  34 #include <uapi/linux/mount.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/processor.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 extern int root_mountflags;
  72
  73 #define RAMDISK_IMAGE_START_MASK        0x07FF
  74 #define RAMDISK_PROMPT_FLAG             0x8000
  75 #define RAMDISK_LOAD_FLAG               0x4000
  76
  77 static char __initdata command_line[COMMAND_LINE_SIZE] = { 0, };
  78
  79 static struct resource code_resource = {
  80         .name = "Kernel code",
  81         .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
  82 };
  83
  84 static struct resource data_resource = {
  85         .name = "Kernel data",
  86         .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
  87 };
  88
  89 static struct resource bss_resource = {
  90         .name   = "Kernel bss",
  91         .flags  = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
  92 };
  93
  94 unsigned long memory_start;
  95 EXPORT_SYMBOL(memory_start);
  96 unsigned long memory_end = 0;
  97 EXPORT_SYMBOL(memory_end);
  98 unsigned long memory_limit = 0;
  99
 100 static struct resource mem_resources[MAX_NUMNODES];
 101
 102 int l1i_cache_shape, l1d_cache_shape, l2_cache_shape;
 103
 104 static int __init early_parse_mem(char *p)
 105 {
 106         if (!p)
 107                 return 1;
 108
 109         memory_limit = PAGE_ALIGN(memparse(p, &p));
 110
 111         pr_notice("Memory limited to %ldMB\n", memory_limit >> 20);
 112
 113         return 0;
 114 }
 115 early_param("mem", early_parse_mem);
 116
 117 void __init check_for_initrd(void)
 118 {
 119 #ifdef CONFIG_BLK_DEV_INITRD
 120         unsigned long start, end;
 121
 122         /*
 123          * Check for the rare cases where boot loaders adhere to the boot
 124          * ABI.
 125          */
 126         if (!LOADER_TYPE || !INITRD_START || !INITRD_SIZE)
 127                 goto disable;
 128
 129         start = INITRD_START + __MEMORY_START;
 130         end = start + INITRD_SIZE;
 131
 132         if (unlikely(end <= start))
 133                 goto disable;
 134         if (unlikely(start & ~PAGE_MASK)) {
 135                 pr_err("initrd must be page aligned\n");
 136                 goto disable;
 137         }
 138
 139         if (unlikely(start < __MEMORY_START)) {
 140                 pr_err("initrd start (%08lx) < __MEMORY_START(%x)\n",
 141                         start, __MEMORY_START);
 142                 goto disable;
 143         }
 144
 145         if (unlikely(end > memblock_end_of_DRAM())) {
 146                 pr_err("initrd extends beyond end of memory "
 147                        "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 148                        end, (unsigned long)memblock_end_of_DRAM());
 149                 goto disable;
 150         }
 151
 152         /*
 153          * If we got this far in spite of the boot loader's best efforts
 154          * to the contrary, assume we actually have a valid initrd and
 155          * fix up the root dev.
 156          */
 157         ROOT_DEV = Root_RAM0;
 158
 159         /*
 160          * Address sanitization
 161          */
 162         initrd_start = (unsigned long)__va(start);
 163         initrd_end = initrd_start + INITRD_SIZE;
 164
 165         memblock_reserve(__pa(initrd_start), INITRD_SIZE);
 166
 167         return;
 168
 169 disable:
 170         pr_info("initrd disabled\n");
 171         initrd_start = initrd_end = 0;
 172 #endif
 173 }
 174
 175 #ifndef CONFIG_GENERIC_CALIBRATE_DELAY
 176 void calibrate_delay(void)
 177 {
 178         struct clk *clk = clk_get(NULL, "cpu_clk");
 179
 180         if (IS_ERR(clk))
 181                 panic("Need a sane CPU clock definition!");
 182
 183         loops_per_jiffy = (clk_get_rate(clk) >> 1) / HZ;
 184
 185         printk(KERN_INFO "Calibrating delay loop (skipped)... "
 186                          "%lu.%02lu BogoMIPS PRESET (lpj=%lu)\n",
 187                          loops_per_jiffy/(500000/HZ),
 188                          (loops_per_jiffy/(5000/HZ)) % 100,
 189                          loops_per_jiffy);
 190 }
 191 #endif
 192
 193 void __init __add_active_range(unsigned int nid, unsigned long start_pfn,
 194                                                 unsigned long end_pfn)
 195 {
 196         struct resource *res = &mem_resources[nid];
 197         unsigned long start, end;
 198
 199         WARN_ON(res->name); /* max one active range per node for now */
 200
 201         start = start_pfn << PAGE_SHIFT;
 202         end = end_pfn << PAGE_SHIFT;
 203
 204         res->name = "System RAM";
 205         res->start = start;
 206         res->end = end - 1;
 207         res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
 208
 209         if (request_resource(&iomem_resource, res)) {
 210                 pr_err("unable to request memory_resource 0x%lx 0x%lx\n",
 211                        start_pfn, end_pfn);
 212                 return;
 213         }
 214
 215         /*
 216          * We don't know which RAM region contains kernel data or
 217          * the reserved crashkernel region, so try it repeatedly
 218          * and let the resource manager test it.
 219          */
 220         request_resource(res, &code_resource);
 221         request_resource(res, &data_resource);
 222         request_resource(res, &bss_resource);
 223 #ifdef CONFIG_CRASH_RESERVE
 224         request_resource(res, &crashk_res);
 225 #endif
 226
 227         /*
 228          * Also make sure that there is a PMB mapping that covers this
 229          * range before we attempt to activate it, to avoid reset by MMU.
 230          * We can hit this path with NUMA or memory hot-add.
 231          */
 232         pmb_bolt_mapping((unsigned long)__va(start), start, end - start,
 233                          PAGE_KERNEL);
 234
 235         memblock_set_node(PFN_PHYS(start_pfn), PFN_PHYS(end_pfn - start_pfn),
 236                           &memblock.memory, nid);
 237 }
 238
 239 void __init __weak plat_early_device_setup(void)
 240 {
 241 }
 242
 243 #ifdef CONFIG_OF_EARLY_FLATTREE
 244 void __ref sh_fdt_init(phys_addr_t dt_phys)
 245 {
 246         static int done = 0;
 247         void *dt_virt;
 248
 249         /* Avoid calling an __init function on secondary cpus. */
 250         if (done) return;
 251
 252 #ifdef CONFIG_USE_BUILTIN_DTB
 253         dt_virt = __dtb_start;
 254 #else
 255         dt_virt = phys_to_virt(dt_phys);
 256 #endif
 257
 258         if (!dt_virt || !early_init_dt_scan(dt_virt, __pa(dt_virt))) {
 259                 pr_crit("Error: invalid device tree blob"
 260                         " at physical address %p\n", (void *)dt_phys);
 261
 262                 while (true)
 263                         cpu_relax();
 264         }
 265
 266         done = 1;
 267 }
 268 #endif
 269
 270 void __init setup_arch(char **cmdline_p)
 271 {
 272         enable_mmu();
 273
 274         ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
 275
 276         printk(KERN_NOTICE "Boot params:\n"
 277                            "... MOUNT_ROOT_RDONLY - %08lx\n"
 278                            "... RAMDISK_FLAGS     - %08lx\n"
 279                            "... ORIG_ROOT_DEV     - %08lx\n"
 280                            "... LOADER_TYPE       - %08lx\n"
 281                            "... INITRD_START      - %08lx\n"
 282                            "... INITRD_SIZE       - %08lx\n",
 283                            MOUNT_ROOT_RDONLY, RAMDISK_FLAGS,
 284                            ORIG_ROOT_DEV, LOADER_TYPE,
 285                            INITRD_START, INITRD_SIZE);
 286
 287 #ifdef CONFIG_BLK_DEV_RAM
 288         rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
 289 #endif
 290
 291         if (!MOUNT_ROOT_RDONLY)
 292                 root_mountflags &= ~MS_RDONLY;
 293         setup_initial_init_mm(_text, _etext, _edata, _end);
 294
 295         code_resource.start = virt_to_phys(_text);
 296         code_resource.end = virt_to_phys(_etext)-1;
 297         data_resource.start = virt_to_phys(_etext);
 298         data_resource.end = virt_to_phys(_edata)-1;
 299         bss_resource.start = virt_to_phys(__bss_start);
 300         bss_resource.end = virt_to_phys(__bss_stop)-1;
 301
 302 #ifdef CONFIG_CMDLINE_OVERWRITE
 303         strscpy(command_line, CONFIG_CMDLINE, sizeof(command_line));
 304 #else
 305         strscpy(command_line, COMMAND_LINE, sizeof(command_line));
 306 #ifdef CONFIG_CMDLINE_EXTEND
 307         strlcat(command_line, " ", sizeof(command_line));
 308         strlcat(command_line, CONFIG_CMDLINE, sizeof(command_line));
 309 #endif
 310 #endif
 311
 312         /* Save unparsed command line copy for /proc/cmdline */
 313         memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
 314         *cmdline_p = command_line;
 315
 316         parse_early_param();
 317
 318         plat_early_device_setup();
 319
 320         sh_mv_setup();
 321
 322         /* Let earlyprintk output early console messages */
 323         sh_early_platform_driver_probe("earlyprintk", 1, 1);
 324
 325 #ifdef CONFIG_OF_EARLY_FLATTREE
 326 #ifdef CONFIG_USE_BUILTIN_DTB
 327         unflatten_and_copy_device_tree();
 328 #else
 329         unflatten_device_tree();
 330 #endif
 331 #endif
 332
 333         paging_init();
 334
 335         /* Perform the machine specific initialisation */
 336         if (likely(sh_mv.mv_setup))
 337                 sh_mv.mv_setup(cmdline_p);
 338
 339         plat_smp_setup();
 340 }
 341
 342 /* processor boot mode configuration */
 343 int generic_mode_pins(void)
 344 {
 345         pr_warn("generic_mode_pins(): missing mode pin configuration\n");
 346         return 0;
 347 }
 348
 349 int test_mode_pin(int pin)
 350 {
 351         return sh_mv.mv_mode_pins() & pin;
 352 }
 353
 354 void __init arch_cpu_finalize_init(void)
 355 {
 356         char *p = &init_utsname()->machine[2]; /* "sh" */
 357
 358         select_idle_routine();
 359
 360         current_cpu_data.loops_per_jiffy = loops_per_jiffy;
 361
 362         switch (current_cpu_data.family) {
 363         case CPU_FAMILY_SH2:
 364                 *p++ = '2';
 365                 break;
 366         case CPU_FAMILY_SH2A:
 367                 *p++ = '2';
 368                 *p++ = 'a';
 369                 break;
 370         case CPU_FAMILY_SH3:
 371                 *p++ = '3';
 372                 break;
 373         case CPU_FAMILY_SH4:
 374                 *p++ = '4';
 375                 break;
 376         case CPU_FAMILY_SH4A:
 377                 *p++ = '4';
 378                 *p++ = 'a';
 379                 break;
 380         case CPU_FAMILY_SH4AL_DSP:
 381                 *p++ = '4';
 382                 *p++ = 'a';
 383                 *p++ = 'l';
 384                 *p++ = '-';
 385                 *p++ = 'd';
 386                 *p++ = 's';
 387                 *p++ = 'p';
 388                 break;
 389         case CPU_FAMILY_UNKNOWN:
 390                 /*
 391                  * Specifically use CPU_FAMILY_UNKNOWN rather than
 392                  * default:, so we're able to have the compiler whine
 393                  * about unhandled enumerations.
 394                  */
 395                 break;
 396         }
 397
 398         pr_info("CPU: %s\n", get_cpu_subtype(&current_cpu_data));
 399
 400 #ifndef __LITTLE_ENDIAN__
 401         /* 'eb' means 'Endian Big' */
 402         *p++ = 'e';
 403         *p++ = 'b';
 404 #endif
 405         *p = '\0';
 406 }