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 <asm/uaccess.h>
  33 #include <asm/io.h>
  34 #include <asm/page.h>
  35 #include <asm/elf.h>
  36 #include <asm/sections.h>
  37 #include <asm/irq.h>
  38 #include <asm/setup.h>
  39 #include <asm/clock.h>
  40 #include <asm/smp.h>
  41 #include <asm/mmu_context.h>
  42 #include <asm/mmzone.h>
  43 #include <asm/sparsemem.h>
  44
  45 /*
  46  * Initialize loops_per_jiffy as 10000000 (1000MIPS).
  47  * This value will be used at the very early stage of serial setup.
  48  * The bigger value means no problem.
  49  */
  50 struct sh_cpuinfo cpu_data[NR_CPUS] __read_mostly = {
  51         [0] = {
  52                 .type                   = CPU_SH_NONE,
  53                 .family                 = CPU_FAMILY_UNKNOWN,
  54                 .loops_per_jiffy        = 10000000,
  55                 .phys_bits              = MAX_PHYSMEM_BITS,
  56         },
  57 };
  58 EXPORT_SYMBOL(cpu_data);
  59
  60 /*
  61  * The machine vector. First entry in .machvec.init, or clobbered by
  62  * sh_mv= on the command line, prior to .machvec.init teardown.
  63  */
  64 struct sh_machine_vector sh_mv = { .mv_name = "generic", };
  65 EXPORT_SYMBOL(sh_mv);
  66
  67 #ifdef CONFIG_VT
  68 struct screen_info screen_info;
  69 #endif
  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_MEM,
  82 };
  83
  84 static struct resource data_resource = {
  85         .name = "Kernel data",
  86         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  87 };
  88
  89 static struct resource bss_resource = {
  90         .name   = "Kernel bss",
  91         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM,
  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 void __cpuinit calibrate_delay(void)
 176 {
 177         struct clk *clk = clk_get(NULL, "cpu_clk");
 178
 179         if (IS_ERR(clk))
 180                 panic("Need a sane CPU clock definition!");
 181
 182         loops_per_jiffy = (clk_get_rate(clk) >> 1) / HZ;
 183
 184         printk(KERN_INFO "Calibrating delay loop (skipped)... "
 185                          "%lu.%02lu BogoMIPS PRESET (lpj=%lu)\n",
 186                          loops_per_jiffy/(500000/HZ),
 187                          (loops_per_jiffy/(5000/HZ)) % 100,
 188                          loops_per_jiffy);
 189 }
 190
 191 void __init __add_active_range(unsigned int nid, unsigned long start_pfn,
 192                                                 unsigned long end_pfn)
 193 {
 194         struct resource *res = &mem_resources[nid];
 195         unsigned long start, end;
 196
 197         WARN_ON(res->name); /* max one active range per node for now */
 198
 199         start = start_pfn << PAGE_SHIFT;
 200         end = end_pfn << PAGE_SHIFT;
 201
 202         res->name = "System RAM";
 203         res->start = start;
 204         res->end = end - 1;
 205         res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 206
 207         if (request_resource(&iomem_resource, res)) {
 208                 pr_err("unable to request memory_resource 0x%lx 0x%lx\n",
 209                        start_pfn, end_pfn);
 210                 return;
 211         }
 212
 213         /*
 214          *  We don't know which RAM region contains kernel data,
 215          *  so we try it repeatedly and let the resource manager
 216          *  test it.
 217          */
 218         request_resource(res, &code_resource);
 219         request_resource(res, &data_resource);
 220         request_resource(res, &bss_resource);
 221
 222         /*
 223          * Also make sure that there is a PMB mapping that covers this
 224          * range before we attempt to activate it, to avoid reset by MMU.
 225          * We can hit this path with NUMA or memory hot-add.
 226          */
 227         pmb_bolt_mapping((unsigned long)__va(start), start, end - start,
 228                          PAGE_KERNEL);
 229
 230         add_active_range(nid, start_pfn, end_pfn);
 231 }
 232
 233 void __init __weak plat_early_device_setup(void)
 234 {
 235 }
 236
 237 void __init setup_arch(char **cmdline_p)
 238 {
 239         enable_mmu();
 240
 241         ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
 242
 243         printk(KERN_NOTICE "Boot params:\n"
 244                            "... MOUNT_ROOT_RDONLY - %08lx\n"
 245                            "... RAMDISK_FLAGS     - %08lx\n"
 246                            "... ORIG_ROOT_DEV     - %08lx\n"
 247                            "... LOADER_TYPE       - %08lx\n"
 248                            "... INITRD_START      - %08lx\n"
 249                            "... INITRD_SIZE       - %08lx\n",
 250                            MOUNT_ROOT_RDONLY, RAMDISK_FLAGS,
 251                            ORIG_ROOT_DEV, LOADER_TYPE,
 252                            INITRD_START, INITRD_SIZE);
 253
 254 #ifdef CONFIG_BLK_DEV_RAM
 255         rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
 256         rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
 257         rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
 258 #endif
 259
 260         if (!MOUNT_ROOT_RDONLY)
 261                 root_mountflags &= ~MS_RDONLY;
 262         init_mm.start_code = (unsigned long) _text;
 263         init_mm.end_code = (unsigned long) _etext;
 264         init_mm.end_data = (unsigned long) _edata;
 265         init_mm.brk = (unsigned long) _end;
 266
 267         code_resource.start = virt_to_phys(_text);
 268         code_resource.end = virt_to_phys(_etext)-1;
 269         data_resource.start = virt_to_phys(_etext);
 270         data_resource.end = virt_to_phys(_edata)-1;
 271         bss_resource.start = virt_to_phys(__bss_start);
 272         bss_resource.end = virt_to_phys(_ebss)-1;
 273
 274 #ifdef CONFIG_CMDLINE_OVERWRITE
 275         strlcpy(command_line, CONFIG_CMDLINE, sizeof(command_line));
 276 #else
 277         strlcpy(command_line, COMMAND_LINE, sizeof(command_line));
 278 #ifdef CONFIG_CMDLINE_EXTEND
 279         strlcat(command_line, " ", sizeof(command_line));
 280         strlcat(command_line, CONFIG_CMDLINE, sizeof(command_line));
 281 #endif
 282 #endif
 283
 284         /* Save unparsed command line copy for /proc/cmdline */
 285         memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
 286         *cmdline_p = command_line;
 287
 288         parse_early_param();
 289
 290         plat_early_device_setup();
 291
 292         sh_mv_setup();
 293
 294         /* Let earlyprintk output early console messages */
 295         early_platform_driver_probe("earlyprintk", 1, 1);
 296
 297         paging_init();
 298
 299 #ifdef CONFIG_DUMMY_CONSOLE
 300         conswitchp = &dummy_con;
 301 #endif
 302
 303         /* Perform the machine specific initialisation */
 304         if (likely(sh_mv.mv_setup))
 305                 sh_mv.mv_setup(cmdline_p);
 306
 307         plat_smp_setup();
 308 }
 309
 310 /* processor boot mode configuration */
 311 int generic_mode_pins(void)
 312 {
 313         pr_warning("generic_mode_pins(): missing mode pin configuration\n");
 314         return 0;
 315 }
 316
 317 int test_mode_pin(int pin)
 318 {
 319         return sh_mv.mv_mode_pins() & pin;
 320 }