LXR linux/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/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 */
  53struct 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};
  61EXPORT_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 */
  67struct sh_machine_vector sh_mv = { .mv_name = "generic", };
  68EXPORT_SYMBOL(sh_mv);
  69
  70#ifdef CONFIG_VT
  71struct screen_info screen_info;
  72#endif
  73
  74extern int root_mountflags;
  75
  76#define RAMDISK_IMAGE_START_MASK        0x07FF
  77#define RAMDISK_PROMPT_FLAG             0x8000
  78#define RAMDISK_LOAD_FLAG               0x4000
  79
  80static char __initdata command_line[COMMAND_LINE_SIZE] = { 0, };
  81
  82static struct resource code_resource = {
  83        .name = "Kernel code",
  84        .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
  85};
  86
  87static struct resource data_resource = {
  88        .name = "Kernel data",
  89        .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
  90};
  91
  92static struct resource bss_resource = {
  93        .name   = "Kernel bss",
  94        .flags  = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
  95};
  96
  97unsigned long memory_start;
  98EXPORT_SYMBOL(memory_start);
  99unsigned long memory_end = 0;
 100EXPORT_SYMBOL(memory_end);
 101unsigned long memory_limit = 0;
 102
 103static struct resource mem_resources[MAX_NUMNODES];
 104
 105int l1i_cache_shape, l1d_cache_shape, l2_cache_shape;
 106
 107static 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}
 118early_param("mem", early_parse_mem);
 119
 120void __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
 172disable:
 173        pr_info("initrd disabled\n");
 174        initrd_start = initrd_end = 0;
 175#endif
 176}
 177
 178#ifndef CONFIG_GENERIC_CALIBRATE_DELAY
 179void 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
 196void __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
 242void __init __weak plat_early_device_setup(void)
 243{
 244}
 245
 246#ifdef CONFIG_OF_FLATTREE
 247void __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
 273void __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#ifdef CONFIG_OF_FLATTREE
 334#ifdef CONFIG_USE_BUILTIN_DTB
 335        unflatten_and_copy_device_tree();
 336#else
 337        unflatten_device_tree();
 338#endif
 339#endif
 340
 341        paging_init();
 342
 343#ifdef CONFIG_DUMMY_CONSOLE
 344        conswitchp = &dummy_con;
 345#endif
 346
 347        /* Perform the machine specific initialisation */
 348        if (likely(sh_mv.mv_setup))
 349                sh_mv.mv_setup(cmdline_p);
 350
 351        plat_smp_setup();
 352}
 353
 354/* processor boot mode configuration */
 355int generic_mode_pins(void)
 356{
 357        pr_warning("generic_mode_pins(): missing mode pin configuration\n");
 358        return 0;
 359}
 360
 361int test_mode_pin(int pin)
 362{
 363        return sh_mv.mv_mode_pins() & pin;
 364}
 365