arch/sh/kernel/setup.c

   1 /*
   2  * arch/sh/kernel/setup.c
   3  *
   4  * This file handles the architecture-dependent parts of initialization
   5  *
   6  *  Copyright (C) 1999  Niibe Yutaka
   7  *  Copyright (C) 2002 - 2010 Paul Mundt
   8  */
   9 #include <linux/screen_info.h>
  10 #include <linux/ioport.h>
  11 #include <linux/init.h>
  12 #include <linux/initrd.h>
  13 #include <linux/bootmem.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 <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/sparsemem.h>
  46
  47 /*
  48  * Initialize loops_per_jiffy as 10000000 (1000MIPS).
  49  * This value will be used at the very early stage of serial setup.
  50  * The bigger value means no problem.
  51  */
  52 struct sh_cpuinfo cpu_data[NR_CPUS] __read_mostly = {
  53         [0] = {
  54                 .type                   = CPU_SH_NONE,
  55                 .family                 = CPU_FAMILY_UNKNOWN,
  56                 .loops_per_jiffy        = 10000000,
  57                 .phys_bits              = MAX_PHYSMEM_BITS,
  58         },
  59 };
  60 EXPORT_SYMBOL(cpu_data);
  61
  62 /*
  63  * The machine vector. First entry in .machvec.init, or clobbered by
  64  * sh_mv= on the command line, prior to .machvec.init teardown.
  65  */
  66 struct sh_machine_vector sh_mv = { .mv_name = "generic", };
  67 EXPORT_SYMBOL(sh_mv);
  68
  69 #ifdef CONFIG_VT
  70 struct screen_info screen_info;
  71 #endif
  72
  73 extern int root_mountflags;
  74
  75 #define RAMDISK_IMAGE_START_MASK        0x07FF
  76 #define RAMDISK_PROMPT_FLAG             0x8000
  77 #define RAMDISK_LOAD_FLAG               0x4000
  78
  79 static char __initdata command_line[COMMAND_LINE_SIZE] = { 0, };
  80
  81 static struct resource code_resource = {
  82         .name = "Kernel code",
  83         .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
  84 };
  85
  86 static struct resource data_resource = {
  87         .name = "Kernel data",
  88         .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
  89 };
  90
  91 static struct resource bss_resource = {
  92         .name   = "Kernel bss",
  93         .flags  = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
  94 };
  95
  96 unsigned long memory_start;
  97 EXPORT_SYMBOL(memory_start);
  98 unsigned long memory_end = 0;
  99 EXPORT_SYMBOL(memory_end);
 100 unsigned long memory_limit = 0;
 101
 102 static struct resource mem_resources[MAX_NUMNODES];
 103
 104 int l1i_cache_shape, l1d_cache_shape, l2_cache_shape;
 105
 106 static int __init early_parse_mem(char *p)
 107 {
 108         if (!p)
 109                 return 1;
 110
 111         memory_limit = PAGE_ALIGN(memparse(p, &p));
 112
 113         pr_notice("Memory limited to %ldMB\n", memory_limit >> 20);
 114
 115         return 0;
 116 }
 117 early_param("mem", early_parse_mem);
 118
 119 void __init check_for_initrd(void)
 120 {
 121 #ifdef CONFIG_BLK_DEV_INITRD
 122         unsigned long start, end;
 123
 124         /*
 125          * Check for the rare cases where boot loaders adhere to the boot
 126          * ABI.
 127          */
 128         if (!LOADER_TYPE || !INITRD_START || !INITRD_SIZE)
 129                 goto disable;
 130
 131         start = INITRD_START + __MEMORY_START;
 132         end = start + INITRD_SIZE;
 133
 134         if (unlikely(end <= start))
 135                 goto disable;
 136         if (unlikely(start & ~PAGE_MASK)) {
 137                 pr_err("initrd must be page aligned\n");
 138                 goto disable;
 139         }
 140
 141         if (unlikely(start < __MEMORY_START)) {
 142                 pr_err("initrd start (%08lx) < __MEMORY_START(%x)\n",
 143                         start, __MEMORY_START);
 144                 goto disable;
 145         }
 146
 147         if (unlikely(end > memblock_end_of_DRAM())) {
 148                 pr_err("initrd extends beyond end of memory "
 149                        "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 150                        end, (unsigned long)memblock_end_of_DRAM());
 151                 goto disable;
 152         }
 153
 154         /*
 155          * If we got this far in spite of the boot loader's best efforts
 156          * to the contrary, assume we actually have a valid initrd and
 157          * fix up the root dev.
 158          */
 159         ROOT_DEV = Root_RAM0;
 160
 161         /*
 162          * Address sanitization
 163          */
 164         initrd_start = (unsigned long)__va(start);
 165         initrd_end = initrd_start + INITRD_SIZE;
 166
 167         memblock_reserve(__pa(initrd_start), INITRD_SIZE);
 168
 169         return;
 170
 171 disable:
 172         pr_info("initrd disabled\n");
 173         initrd_start = initrd_end = 0;
 174 #endif
 175 }
 176
 177 #ifndef CONFIG_GENERIC_CALIBRATE_DELAY
 178 void calibrate_delay(void)
 179 {
 180         struct clk *clk = clk_get(NULL, "cpu_clk");
 181
 182         if (IS_ERR(clk))
 183                 panic("Need a sane CPU clock definition!");
 184
 185         loops_per_jiffy = (clk_get_rate(clk) >> 1) / HZ;
 186
 187         printk(KERN_INFO "Calibrating delay loop (skipped)... "
 188                          "%lu.%02lu BogoMIPS PRESET (lpj=%lu)\n",
 189                          loops_per_jiffy/(500000/HZ),
 190                          (loops_per_jiffy/(5000/HZ)) % 100,
 191                          loops_per_jiffy);
 192 }
 193 #endif
 194
 195 void __init __add_active_range(unsigned int nid, unsigned long start_pfn,
 196                                                 unsigned long end_pfn)
 197 {
 198         struct resource *res = &mem_resources[nid];
 199         unsigned long start, end;
 200
 201         WARN_ON(res->name); /* max one active range per node for now */
 202
 203         start = start_pfn << PAGE_SHIFT;
 204         end = end_pfn << PAGE_SHIFT;
 205
 206         res->name = "System RAM";
 207         res->start = start;
 208         res->end = end - 1;
 209         res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
 210
 211         if (request_resource(&iomem_resource, res)) {
 212                 pr_err("unable to request memory_resource 0x%lx 0x%lx\n",
 213                        start_pfn, end_pfn);
 214                 return;
 215         }
 216
 217         /*
 218          * We don't know which RAM region contains kernel data or
 219          * the reserved crashkernel region, so try it repeatedly
 220          * and let the resource manager test it.
 221          */
 222         request_resource(res, &code_resource);
 223         request_resource(res, &data_resource);
 224         request_resource(res, &bss_resource);
 225 #ifdef CONFIG_KEXEC
 226         request_resource(res, &crashk_res);
 227 #endif
 228
 229         /*
 230          * Also make sure that there is a PMB mapping that covers this
 231          * range before we attempt to activate it, to avoid reset by MMU.
 232          * We can hit this path with NUMA or memory hot-add.
 233          */
 234         pmb_bolt_mapping((unsigned long)__va(start), start, end - start,
 235                          PAGE_KERNEL);
 236
 237         memblock_set_node(PFN_PHYS(start_pfn), PFN_PHYS(end_pfn - start_pfn),
 238                           &memblock.memory, nid);
 239 }
 240
 241 void __init __weak plat_early_device_setup(void)
 242 {
 243 }
 244
 245 #ifdef CONFIG_OF_FLATTREE
 246 void __ref sh_fdt_init(phys_addr_t dt_phys)
 247 {
 248         static int done = 0;
 249         void *dt_virt;
 250
 251         /* Avoid calling an __init function on secondary cpus. */
 252         if (done) return;
 253
 254 #ifdef CONFIG_USE_BUILTIN_DTB
 255         dt_virt = __dtb_start;
 256 #else
 257         dt_virt = phys_to_virt(dt_phys);
 258 #endif
 259
 260         if (!dt_virt || !early_init_dt_scan(dt_virt)) {
 261                 pr_crit("Error: invalid device tree blob"
 262                         " at physical address %p\n", (void *)dt_phys);
 263
 264                 while (true)
 265                         cpu_relax();
 266         }
 267
 268         done = 1;
 269 }
 270 #endif
 271
 272 void __init setup_arch(char **cmdline_p)
 273 {
 274         enable_mmu();
 275
 276         ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
 277
 278         printk(KERN_NOTICE "Boot params:\n"
 279                            "... MOUNT_ROOT_RDONLY - %08lx\n"
 280                            "... RAMDISK_FLAGS     - %08lx\n"
 281                            "... ORIG_ROOT_DEV     - %08lx\n"
 282                            "... LOADER_TYPE       - %08lx\n"
 283                            "... INITRD_START      - %08lx\n"
 284                            "... INITRD_SIZE       - %08lx\n",
 285                            MOUNT_ROOT_RDONLY, RAMDISK_FLAGS,
 286                            ORIG_ROOT_DEV, LOADER_TYPE,
 287                            INITRD_START, INITRD_SIZE);
 288
 289 #ifdef CONFIG_BLK_DEV_RAM
 290         rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
 291         rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
 292         rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
 293 #endif
 294
 295         if (!MOUNT_ROOT_RDONLY)
 296                 root_mountflags &= ~MS_RDONLY;
 297         init_mm.start_code = (unsigned long) _text;
 298         init_mm.end_code = (unsigned long) _etext;
 299         init_mm.end_data = (unsigned long) _edata;
 300         init_mm.brk = (unsigned long) _end;
 301
 302         code_resource.start = virt_to_phys(_text);
 303         code_resource.end = virt_to_phys(_etext)-1;
 304         data_resource.start = virt_to_phys(_etext);
 305         data_resource.end = virt_to_phys(_edata)-1;
 306         bss_resource.start = virt_to_phys(__bss_start);
 307         bss_resource.end = virt_to_phys(__bss_stop)-1;
 308
 309 #ifdef CONFIG_CMDLINE_OVERWRITE
 310         strlcpy(command_line, CONFIG_CMDLINE, sizeof(command_line));
 311 #else
 312         strlcpy(command_line, COMMAND_LINE, sizeof(command_line));
 313 #ifdef CONFIG_CMDLINE_EXTEND
 314         strlcat(command_line, " ", sizeof(command_line));
 315         strlcat(command_line, CONFIG_CMDLINE, sizeof(command_line));
 316 #endif
 317 #endif
 318
 319         /* Save unparsed command line copy for /proc/cmdline */
 320         memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
 321         *cmdline_p = command_line;
 322
 323         parse_early_param();
 324
 325         plat_early_device_setup();
 326
 327         sh_mv_setup();
 328
 329         /* Let earlyprintk output early console messages */
 330         early_platform_driver_probe("earlyprintk", 1, 1);
 331
 332         paging_init();
 333
 334 #ifdef CONFIG_DUMMY_CONSOLE
 335         conswitchp = &dummy_con;
 336 #endif
 337
 338         /* Perform the machine specific initialisation */
 339         if (likely(sh_mv.mv_setup))
 340                 sh_mv.mv_setup(cmdline_p);
 341
 342         plat_smp_setup();
 343 }
 344
 345 /* processor boot mode configuration */
 346 int generic_mode_pins(void)
 347 {
 348         pr_warning("generic_mode_pins(): missing mode pin configuration\n");
 349         return 0;
 350 }
 351
 352 int test_mode_pin(int pin)
 353 {
 354         return sh_mv.mv_mode_pins() & pin;
 355 }