/* *  linux/arch/h8300/kernel/setup.c * *  Copyright (C) 2001-2014 Yoshinori Sato <ysato@users.sourceforge.jp> */ /* * This file handles the architecture-dependent parts of system setup */ #include <linux/kernel.h>#include <linux/sched.h>#include <linux/delay.h>#include <linux/interrupt.h>#include <linux/mm.h>#include <linux/fs.h>#include <linux/console.h>#include <linux/errno.h>#include <linux/string.h>#include <linux/bootmem.h>#include <linux/seq_file.h>#include <linux/init.h>#include <linux/of.h>#include <linux/of_fdt.h>#include <linux/of_platform.h>#include <linux/of_address.h>#include <linux/clk-provider.h>#include <linux/memblock.h>#include <linux/screen_info.h>#include <linux/clocksource.h> #include <asm/setup.h>#include <asm/irq.h>#include <asm/pgtable.h>#include <asm/sections.h>#include <asm/page.h> #if defined(CONFIG_CPU_H8300H)#define CPU "H8/300H"#elif defined(CONFIG_CPU_H8S)#define CPU "H8S"#else#define CPU "Unknown"#endif unsigned long memory_start;unsigned long memory_end;EXPORT_SYMBOL(memory_end);static unsigned long freq;extern char __dtb_start[]; #ifdef CONFIG_VTstruct screen_info screen_info;#endif char __initdata command_line[COMMAND_LINE_SIZE]; void sim_console_register(void); void __init h8300_fdt_init(void *fdt, char *bootargs){	if (!fdt)		fdt = __dtb_start;	else		strcpy(command_line, bootargs); 	early_init_dt_scan(fdt);	memblock_allow_resize();} static void __init bootmem_init(void){	int bootmap_size;	unsigned long ram_start_pfn;	unsigned long free_ram_start_pfn;	unsigned long ram_end_pfn;	struct memblock_region *region; 	memory_end = memory_start = 0; 	/* Find main memory where is the kernel */	for_each_memblock(memory, region) {		memory_start = region->base;		memory_end = region->base + region->size;	} 	if (!memory_end)		panic("No memory!"); 	ram_start_pfn = PFN_UP(memory_start);	/* free_ram_start_pfn is first page after kernel */	free_ram_start_pfn = PFN_UP(__pa(_end));	ram_end_pfn = PFN_DOWN(memblock_end_of_DRAM()); 	max_pfn = ram_end_pfn; 	/*	 * give all the memory to the bootmap allocator,  tell it to put the	 * boot mem_map at the start of memory	 */	bootmap_size = init_bootmem_node(NODE_DATA(0),					 free_ram_start_pfn,					 0,					 ram_end_pfn);	/*	 * free the usable memory,  we have to make sure we do not free	 * the bootmem bitmap so we then reserve it after freeing it :-)	 */	free_bootmem(PFN_PHYS(free_ram_start_pfn),		     (ram_end_pfn - free_ram_start_pfn) << PAGE_SHIFT);	reserve_bootmem(PFN_PHYS(free_ram_start_pfn), bootmap_size,			BOOTMEM_DEFAULT); 	for_each_memblock(reserved, region) {		reserve_bootmem(region->base, region->size, BOOTMEM_DEFAULT);	}} void __init setup_arch(char **cmdline_p){	unflatten_and_copy_device_tree(); 	init_mm.start_code = (unsigned long) _stext;	init_mm.end_code = (unsigned long) _etext;	init_mm.end_data = (unsigned long) _edata;	init_mm.brk = (unsigned long) 0; 	pr_notice("\r\n\nuClinux " CPU "\n");	pr_notice("Flat model support (C) 1998,1999 Kenneth Albanowski, D. Jeff Dionne\n"); 	if (*command_line)		strcpy(boot_command_line, command_line);	*cmdline_p = boot_command_line; 	parse_early_param(); 	bootmem_init();	/*	 * get kmalloc into gear	 */	paging_init();} /* *	Get CPU information for use by the procfs. */ static int show_cpuinfo(struct seq_file *m, void *v){	char *cpu; 	cpu = CPU; 	seq_printf(m,  "CPU:\t\t%s\n"		   "Clock:\t\t%lu.%1luMHz\n"		   "BogoMips:\t%lu.%02lu\n"		   "Calibration:\t%lu loops\n",		   cpu,		   freq/1000, freq%1000,		   (loops_per_jiffy*HZ)/500000,		   ((loops_per_jiffy*HZ)/5000)%100,		   (loops_per_jiffy*HZ)); 	return 0;} static void *c_start(struct seq_file *m, loff_t *pos){	return *pos < num_possible_cpus() ?		((void *) 0x12345678) : NULL;} static void *c_next(struct seq_file *m, void *v, loff_t *pos){	++*pos;	return c_start(m, pos);} static void c_stop(struct seq_file *m, void *v){} const struct seq_operations cpuinfo_op = {	.start	= c_start,	.next	= c_next,	.stop	= c_stop,	.show	= show_cpuinfo,}; static int __init device_probe(void){	of_platform_populate(NULL, NULL, NULL, NULL); 	return 0;} device_initcall(device_probe); #if defined(CONFIG_CPU_H8300H)#define get_wait(base, addr) ({		\	int baddr;			\	baddr = ((addr) / 0x200000 * 2);			     \	w *= (readw((base) + 2) & (3 << baddr)) + 1;		     \	})#endif#if defined(CONFIG_CPU_H8S)#define get_wait(base, addr) ({		\	int baddr;			\	baddr = ((addr) / 0x200000 * 16);			     \	w *= (readl((base) + 2) & (7 << baddr)) + 1;	\	})#endif static __init int access_timing(void){	struct device_node *bsc;	void __iomem *base;	unsigned long addr = (unsigned long)&__delay;	int bit = 1 << (addr / 0x200000);	int w; 	bsc = of_find_compatible_node(NULL, NULL, "renesas,h8300-bsc");	base = of_iomap(bsc, 0);	w = (readb(base + 0) & bit)?2:1;	if (readb(base + 1) & bit)		w *= get_wait(base, addr);	else		w *= 2;	return w * 3 / 2;} void __init calibrate_delay(void){	struct device_node *cpu;	int freq; 	cpu = of_find_compatible_node(NULL, NULL, "renesas,h8300");	of_property_read_s32(cpu, "clock-frequency", &freq);	loops_per_jiffy = freq / HZ / (access_timing() * 2);	pr_cont("%lu.%02lu BogoMIPS (lpj=%lu)\n",		loops_per_jiffy / (500000 / HZ),		(loops_per_jiffy / (5000 / HZ)) % 100, loops_per_jiffy);}  void __init time_init(void){	of_clk_init(NULL);	timer_probe();}