// SPDX-License-Identifier: GPL-2.0 /* * arch/sh/kernel/setup.c * * This file handles the architecture-dependent parts of initialization * * Copyright (C) 1999 Niibe Yutaka * Copyright (C) 2002 - 2010 Paul Mundt */ #include <linux/screen_info.h> #include <linux/ioport.h> #include <linux/init.h> #include <linux/initrd.h> #include <linux/console.h> #include <linux/root_dev.h> #include <linux/utsname.h> #include <linux/nodemask.h> #include <linux/cpu.h> #include <linux/pfn.h> #include <linux/fs.h> #include <linux/mm.h> #include <linux/kexec.h> #include <linux/module.h> #include <linux/smp.h> #include <linux/err.h> #include <linux/crash_dump.h> #include <linux/mmzone.h> #include <linux/clk.h> #include <linux/delay.h> #include <linux/platform_device.h> #include <linux/memblock.h> #include <linux/of.h> #include <linux/of_fdt.h> #include <linux/uaccess.h> #include <uapi/linux/mount.h> #include <asm/io.h> #include <asm/page.h> #include <asm/elf.h> #include <asm/sections.h> #include <asm/irq.h> #include <asm/setup.h> #include <asm/clock.h> #include <asm/smp.h> #include <asm/mmu_context.h> #include <asm/mmzone.h> #include <asm/sparsemem.h> /* * Initialize loops_per_jiffy as 10000000 (1000MIPS). * This value will be used at the very early stage of serial setup. * The bigger value means no problem. */ struct sh_cpuinfo cpu_data[NR_CPUS] __read_mostly = { [0] = { .type = CPU_SH_NONE, .family = CPU_FAMILY_UNKNOWN, .loops_per_jiffy = 10000000, .phys_bits = MAX_PHYSMEM_BITS, }, }; EXPORT_SYMBOL(cpu_data); /* * The machine vector. First entry in .machvec.init, or clobbered by * sh_mv= on the command line, prior to .machvec.init teardown. */ struct sh_machine_vector sh_mv = { .mv_name = "generic", }; EXPORT_SYMBOL(sh_mv); #ifdef CONFIG_VT struct screen_info screen_info; #endif extern int root_mountflags; #define RAMDISK_IMAGE_START_MASK 0x07FF #define RAMDISK_PROMPT_FLAG 0x8000 #define RAMDISK_LOAD_FLAG 0x4000 static char __initdata command_line[COMMAND_LINE_SIZE] = { 0, }; static struct resource code_resource = { .name = "Kernel code", .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, }; static struct resource data_resource = { .name = "Kernel data", .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, }; static struct resource bss_resource = { .name = "Kernel bss", .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, }; unsigned long memory_start; EXPORT_SYMBOL(memory_start); unsigned long memory_end = 0; EXPORT_SYMBOL(memory_end); unsigned long memory_limit = 0; static struct resource mem_resources[MAX_NUMNODES]; int l1i_cache_shape, l1d_cache_shape, l2_cache_shape; static int __init early_parse_mem(char *p) { if (!p) return 1; memory_limit = PAGE_ALIGN(memparse(p, &p)); pr_notice("Memory limited to %ldMB\n", memory_limit >> 20); return 0; } early_param("mem", early_parse_mem); void __init check_for_initrd(void) { #ifdef CONFIG_BLK_DEV_INITRD unsigned long start, end; /* * Check for the rare cases where boot loaders adhere to the boot * ABI. */ if (!LOADER_TYPE || !INITRD_START || !INITRD_SIZE) goto disable; start = INITRD_START + __MEMORY_START; end = start + INITRD_SIZE; if (unlikely(end <= start)) goto disable; if (unlikely(start & ~PAGE_MASK)) { pr_err("initrd must be page aligned\n"); goto disable; } if (unlikely(start < __MEMORY_START)) { pr_err("initrd start (%08lx) < __MEMORY_START(%x)\n", start, __MEMORY_START); goto disable; } if (unlikely(end > memblock_end_of_DRAM())) { pr_err("initrd extends beyond end of memory " "(0x%08lx > 0x%08lx)\ndisabling initrd\n", end, (unsigned long)memblock_end_of_DRAM()); goto disable; } /* * If we got this far in spite of the boot loader's best efforts * to the contrary, assume we actually have a valid initrd and * fix up the root dev. */ ROOT_DEV = Root_RAM0; /* * Address sanitization */ initrd_start = (unsigned long)__va(start); initrd_end = initrd_start + INITRD_SIZE; memblock_reserve(__pa(initrd_start), INITRD_SIZE); return; disable: pr_info("initrd disabled\n"); initrd_start = initrd_end = 0; #endif } #ifndef CONFIG_GENERIC_CALIBRATE_DELAY void calibrate_delay(void) { struct clk *clk = clk_get(NULL, "cpu_clk"); if (IS_ERR(clk)) panic("Need a sane CPU clock definition!"); loops_per_jiffy = (clk_get_rate(clk) >> 1) / HZ; printk(KERN_INFO "Calibrating delay loop (skipped)... " "%lu.%02lu BogoMIPS PRESET (lpj=%lu)\n", loops_per_jiffy/(500000/HZ), (loops_per_jiffy/(5000/HZ)) % 100, loops_per_jiffy); } #endif void __init __add_active_range(unsigned int nid, unsigned long start_pfn, unsigned long end_pfn) { struct resource *res = &mem_resources[nid]; unsigned long start, end; WARN_ON(res->name); /* max one active range per node for now */ start = start_pfn << PAGE_SHIFT; end = end_pfn << PAGE_SHIFT; res->name = "System RAM"; res->start = start; res->end = end - 1; res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; if (request_resource(&iomem_resource, res)) { pr_err("unable to request memory_resource 0x%lx 0x%lx\n", start_pfn, end_pfn); return; } /* * We don't know which RAM region contains kernel data or * the reserved crashkernel region, so try it repeatedly * and let the resource manager test it. */ request_resource(res, &code_resource); request_resource(res, &data_resource); request_resource(res, &bss_resource); #ifdef CONFIG_KEXEC request_resource(res, &crashk_res); #endif /* * Also make sure that there is a PMB mapping that covers this * range before we attempt to activate it, to avoid reset by MMU. * We can hit this path with NUMA or memory hot-add. */ pmb_bolt_mapping((unsigned long)__va(start), start, end - start, PAGE_KERNEL); memblock_set_node(PFN_PHYS(start_pfn), PFN_PHYS(end_pfn - start_pfn), &memblock.memory, nid); } void __init __weak plat_early_device_setup(void) { } #ifdef CONFIG_OF_FLATTREE void __ref sh_fdt_init(phys_addr_t dt_phys) { static int done = 0; void *dt_virt; /* Avoid calling an __init function on secondary cpus. */ if (done) return; #ifdef CONFIG_USE_BUILTIN_DTB dt_virt = __dtb_start; #else dt_virt = phys_to_virt(dt_phys); #endif if (!dt_virt || !early_init_dt_scan(dt_virt)) { pr_crit("Error: invalid device tree blob" " at physical address %p\n", (void *)dt_phys); while (true) cpu_relax(); } done = 1; } #endif void __init setup_arch(char **cmdline_p) { enable_mmu(); ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV); printk(KERN_NOTICE "Boot params:\n" "... MOUNT_ROOT_RDONLY - %08lx\n" "... RAMDISK_FLAGS - %08lx\n" "... ORIG_ROOT_DEV - %08lx\n" "... LOADER_TYPE - %08lx\n" "... INITRD_START - %08lx\n" "... INITRD_SIZE - %08lx\n", MOUNT_ROOT_RDONLY, RAMDISK_FLAGS, ORIG_ROOT_DEV, LOADER_TYPE, INITRD_START, INITRD_SIZE); #ifdef CONFIG_BLK_DEV_RAM rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK; rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0); rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0); #endif if (!MOUNT_ROOT_RDONLY) root_mountflags &= ~MS_RDONLY; init_mm.start_code = (unsigned long) _text; init_mm.end_code = (unsigned long) _etext; init_mm.end_data = (unsigned long) _edata; init_mm.brk = (unsigned long) _end; code_resource.start = virt_to_phys(_text); code_resource.end = virt_to_phys(_etext)-1; data_resource.start = virt_to_phys(_etext); data_resource.end = virt_to_phys(_edata)-1; bss_resource.start = virt_to_phys(__bss_start); bss_resource.end = virt_to_phys(__bss_stop)-1; #ifdef CONFIG_CMDLINE_OVERWRITE strlcpy(command_line, CONFIG_CMDLINE, sizeof(command_line)); #else strlcpy(command_line, COMMAND_LINE, sizeof(command_line)); #ifdef CONFIG_CMDLINE_EXTEND strlcat(command_line, " ", sizeof(command_line)); strlcat(command_line, CONFIG_CMDLINE, sizeof(command_line)); #endif #endif /* Save unparsed command line copy for /proc/cmdline */ memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE); *cmdline_p = command_line; parse_early_param(); plat_early_device_setup(); sh_mv_setup(); /* Let earlyprintk output early console messages */ early_platform_driver_probe("earlyprintk", 1, 1); #ifdef CONFIG_OF_FLATTREE #ifdef CONFIG_USE_BUILTIN_DTB unflatten_and_copy_device_tree(); #else unflatten_device_tree(); #endif #endif paging_init(); #ifdef CONFIG_DUMMY_CONSOLE conswitchp = &dummy_con; #endif /* Perform the machine specific initialisation */ if (likely(sh_mv.mv_setup)) sh_mv.mv_setup(cmdline_p); plat_smp_setup(); } /* processor boot mode configuration */ int generic_mode_pins(void) { pr_warning("generic_mode_pins(): missing mode pin configuration\n"); return 0; } int test_mode_pin(int pin) { return sh_mv.mv_mode_pins() & pin; }