linux/arch/sh/kernel/setup.c
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   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#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 */
  54struct 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};
  62EXPORT_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 */
  68struct sh_machine_vector sh_mv = { .mv_name = "generic", };
  69EXPORT_SYMBOL(sh_mv);
  70
  71#ifdef CONFIG_VT
  72struct screen_info screen_info;
  73#endif
  74
  75extern int root_mountflags;
  76
  77#define RAMDISK_IMAGE_START_MASK        0x07FF
  78#define RAMDISK_PROMPT_FLAG             0x8000
  79#define RAMDISK_LOAD_FLAG               0x4000
  80
  81static char __initdata command_line[COMMAND_LINE_SIZE] = { 0, };
  82
  83static struct resource code_resource = {
  84        .name = "Kernel code",
  85        .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
  86};
  87
  88static struct resource data_resource = {
  89        .name = "Kernel data",
  90        .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
  91};
  92
  93static struct resource bss_resource = {
  94        .name   = "Kernel bss",
  95        .flags  = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
  96};
  97
  98unsigned long memory_start;
  99EXPORT_SYMBOL(memory_start);
 100unsigned long memory_end = 0;
 101EXPORT_SYMBOL(memory_end);
 102unsigned long memory_limit = 0;
 103
 104static struct resource mem_resources[MAX_NUMNODES];
 105
 106int l1i_cache_shape, l1d_cache_shape, l2_cache_shape;
 107
 108static int __init early_parse_mem(char *p)
 109{
 110        if (!p)
 111                return 1;
 112
 113        memory_limit = PAGE_ALIGN(memparse(p, &p));
 114
 115        pr_notice("Memory limited to %ldMB\n", memory_limit >> 20);
 116
 117        return 0;
 118}
 119early_param("mem", early_parse_mem);
 120
 121void __init check_for_initrd(void)
 122{
 123#ifdef CONFIG_BLK_DEV_INITRD
 124        unsigned long start, end;
 125
 126        /*
 127         * Check for the rare cases where boot loaders adhere to the boot
 128         * ABI.
 129         */
 130        if (!LOADER_TYPE || !INITRD_START || !INITRD_SIZE)
 131                goto disable;
 132
 133        start = INITRD_START + __MEMORY_START;
 134        end = start + INITRD_SIZE;
 135
 136        if (unlikely(end <= start))
 137                goto disable;
 138        if (unlikely(start & ~PAGE_MASK)) {
 139                pr_err("initrd must be page aligned\n");
 140                goto disable;
 141        }
 142
 143        if (unlikely(start < __MEMORY_START)) {
 144                pr_err("initrd start (%08lx) < __MEMORY_START(%x)\n",
 145                        start, __MEMORY_START);
 146                goto disable;
 147        }
 148
 149        if (unlikely(end > memblock_end_of_DRAM())) {
 150                pr_err("initrd extends beyond end of memory "
 151                       "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 152                       end, (unsigned long)memblock_end_of_DRAM());
 153                goto disable;
 154        }
 155
 156        /*
 157         * If we got this far in spite of the boot loader's best efforts
 158         * to the contrary, assume we actually have a valid initrd and
 159         * fix up the root dev.
 160         */
 161        ROOT_DEV = Root_RAM0;
 162
 163        /*
 164         * Address sanitization
 165         */
 166        initrd_start = (unsigned long)__va(start);
 167        initrd_end = initrd_start + INITRD_SIZE;
 168
 169        memblock_reserve(__pa(initrd_start), INITRD_SIZE);
 170
 171        return;
 172
 173disable:
 174        pr_info("initrd disabled\n");
 175        initrd_start = initrd_end = 0;
 176#endif
 177}
 178
 179#ifndef CONFIG_GENERIC_CALIBRATE_DELAY
 180void calibrate_delay(void)
 181{
 182        struct clk *clk = clk_get(NULL, "cpu_clk");
 183
 184        if (IS_ERR(clk))
 185                panic("Need a sane CPU clock definition!");
 186
 187        loops_per_jiffy = (clk_get_rate(clk) >> 1) / HZ;
 188
 189        printk(KERN_INFO "Calibrating delay loop (skipped)... "
 190                         "%lu.%02lu BogoMIPS PRESET (lpj=%lu)\n",
 191                         loops_per_jiffy/(500000/HZ),
 192                         (loops_per_jiffy/(5000/HZ)) % 100,
 193                         loops_per_jiffy);
 194}
 195#endif
 196
 197void __init __add_active_range(unsigned int nid, unsigned long start_pfn,
 198                                                unsigned long end_pfn)
 199{
 200        struct resource *res = &mem_resources[nid];
 201        unsigned long start, end;
 202
 203        WARN_ON(res->name); /* max one active range per node for now */
 204
 205        start = start_pfn << PAGE_SHIFT;
 206        end = end_pfn << PAGE_SHIFT;
 207
 208        res->name = "System RAM";
 209        res->start = start;
 210        res->end = end - 1;
 211        res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
 212
 213        if (request_resource(&iomem_resource, res)) {
 214                pr_err("unable to request memory_resource 0x%lx 0x%lx\n",
 215                       start_pfn, end_pfn);
 216                return;
 217        }
 218
 219        /*
 220         * We don't know which RAM region contains kernel data or
 221         * the reserved crashkernel region, so try it repeatedly
 222         * and let the resource manager test it.
 223         */
 224        request_resource(res, &code_resource);
 225        request_resource(res, &data_resource);
 226        request_resource(res, &bss_resource);
 227#ifdef CONFIG_KEXEC
 228        request_resource(res, &crashk_res);
 229#endif
 230
 231        /*
 232         * Also make sure that there is a PMB mapping that covers this
 233         * range before we attempt to activate it, to avoid reset by MMU.
 234         * We can hit this path with NUMA or memory hot-add.
 235         */
 236        pmb_bolt_mapping((unsigned long)__va(start), start, end - start,
 237                         PAGE_KERNEL);
 238
 239        memblock_set_node(PFN_PHYS(start_pfn), PFN_PHYS(end_pfn - start_pfn),
 240                          &memblock.memory, nid);
 241}
 242
 243void __init __weak plat_early_device_setup(void)
 244{
 245}
 246
 247#ifdef CONFIG_OF_FLATTREE
 248void __ref sh_fdt_init(phys_addr_t dt_phys)
 249{
 250        static int done = 0;
 251        void *dt_virt;
 252
 253        /* Avoid calling an __init function on secondary cpus. */
 254        if (done) return;
 255
 256#ifdef CONFIG_USE_BUILTIN_DTB
 257        dt_virt = __dtb_start;
 258#else
 259        dt_virt = phys_to_virt(dt_phys);
 260#endif
 261
 262        if (!dt_virt || !early_init_dt_scan(dt_virt)) {
 263                pr_crit("Error: invalid device tree blob"
 264                        " at physical address %p\n", (void *)dt_phys);
 265
 266                while (true)
 267                        cpu_relax();
 268        }
 269
 270        done = 1;
 271}
 272#endif
 273
 274void __init setup_arch(char **cmdline_p)
 275{
 276        enable_mmu();
 277
 278        ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
 279
 280        printk(KERN_NOTICE "Boot params:\n"
 281                           "... MOUNT_ROOT_RDONLY - %08lx\n"
 282                           "... RAMDISK_FLAGS     - %08lx\n"
 283                           "... ORIG_ROOT_DEV     - %08lx\n"
 284                           "... LOADER_TYPE       - %08lx\n"
 285                           "... INITRD_START      - %08lx\n"
 286                           "... INITRD_SIZE       - %08lx\n",
 287                           MOUNT_ROOT_RDONLY, RAMDISK_FLAGS,
 288                           ORIG_ROOT_DEV, LOADER_TYPE,
 289                           INITRD_START, INITRD_SIZE);
 290
 291#ifdef CONFIG_BLK_DEV_RAM
 292        rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
 293#endif
 294
 295        if (!MOUNT_ROOT_RDONLY)
 296                root_mountflags &= ~MS_RDONLY;
 297        setup_initial_init_mm(_text, _etext, _edata, _end);
 298
 299        code_resource.start = virt_to_phys(_text);
 300        code_resource.end = virt_to_phys(_etext)-1;
 301        data_resource.start = virt_to_phys(_etext);
 302        data_resource.end = virt_to_phys(_edata)-1;
 303        bss_resource.start = virt_to_phys(__bss_start);
 304        bss_resource.end = virt_to_phys(__bss_stop)-1;
 305
 306#ifdef CONFIG_CMDLINE_OVERWRITE
 307        strlcpy(command_line, CONFIG_CMDLINE, sizeof(command_line));
 308#else
 309        strlcpy(command_line, COMMAND_LINE, sizeof(command_line));
 310#ifdef CONFIG_CMDLINE_EXTEND
 311        strlcat(command_line, " ", sizeof(command_line));
 312        strlcat(command_line, CONFIG_CMDLINE, sizeof(command_line));
 313#endif
 314#endif
 315
 316        /* Save unparsed command line copy for /proc/cmdline */
 317        memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
 318        *cmdline_p = command_line;
 319
 320        parse_early_param();
 321
 322        plat_early_device_setup();
 323
 324        sh_mv_setup();
 325
 326        /* Let earlyprintk output early console messages */
 327        sh_early_platform_driver_probe("earlyprintk", 1, 1);
 328
 329#ifdef CONFIG_OF_FLATTREE
 330#ifdef CONFIG_USE_BUILTIN_DTB
 331        unflatten_and_copy_device_tree();
 332#else
 333        unflatten_device_tree();
 334#endif
 335#endif
 336
 337        paging_init();
 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 */
 347int generic_mode_pins(void)
 348{
 349        pr_warn("generic_mode_pins(): missing mode pin configuration\n");
 350        return 0;
 351}
 352
 353int test_mode_pin(int pin)
 354{
 355        return sh_mv.mv_mode_pins() & pin;
 356}
 357