| 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 | } |