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