// 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/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/processor.h>#include <asm/sparsemem.h>#include <asm/platform_early.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); 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_DELAYvoid 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_CRASH_RESERVE	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_EARLY_FLATTREEvoid __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, __pa(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;#endif 	if (!MOUNT_ROOT_RDONLY)		root_mountflags &= ~MS_RDONLY;	setup_initial_init_mm(_text, _etext, _edata, _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	strscpy(command_line, CONFIG_CMDLINE, sizeof(command_line));#else	strscpy(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 */	sh_early_platform_driver_probe("earlyprintk", 1, 1); #ifdef CONFIG_OF_EARLY_FLATTREE#ifdef CONFIG_USE_BUILTIN_DTB	unflatten_and_copy_device_tree();#else	unflatten_device_tree();#endif#endif 	paging_init(); 	/* 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_warn("generic_mode_pins(): missing mode pin configuration\n");	return 0;} int test_mode_pin(int pin){	return sh_mv.mv_mode_pins() & pin;} void __init arch_cpu_finalize_init(void){	char *p = &init_utsname()->machine[2]; /* "sh" */ 	select_idle_routine(); 	current_cpu_data.loops_per_jiffy = loops_per_jiffy; 	switch (current_cpu_data.family) {	case CPU_FAMILY_SH2:		*p++ = '2';		break;	case CPU_FAMILY_SH2A:		*p++ = '2';		*p++ = 'a';		break;	case CPU_FAMILY_SH3:		*p++ = '3';		break;	case CPU_FAMILY_SH4:		*p++ = '4';		break;	case CPU_FAMILY_SH4A:		*p++ = '4';		*p++ = 'a';		break;	case CPU_FAMILY_SH4AL_DSP:		*p++ = '4';		*p++ = 'a';		*p++ = 'l';		*p++ = '-';		*p++ = 'd';		*p++ = 's';		*p++ = 'p';		break;	case CPU_FAMILY_UNKNOWN:		/*		 * Specifically use CPU_FAMILY_UNKNOWN rather than		 * default:, so we're able to have the compiler whine		 * about unhandled enumerations.		 */		break;	} 	pr_info("CPU: %s\n", get_cpu_subtype(&current_cpu_data)); #ifndef __LITTLE_ENDIAN__	/* 'eb' means 'Endian Big' */	*p++ = 'e';	*p++ = 'b';#endif	*p = '\0';}