1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 *  linux/arch/h8300/kernel/setup.c
  4 *
  5 *  Copyright (C) 2001-2014 Yoshinori Sato <ysato@users.sourceforge.jp>
  6 */
  7
  8/*
  9 * This file handles the architecture-dependent parts of system setup
 10 */
 11
 12#include <linux/kernel.h>
 13#include <linux/sched.h>
 14#include <linux/delay.h>
 15#include <linux/interrupt.h>
 16#include <linux/io.h>
 17#include <linux/mm.h>
 18#include <linux/fs.h>
 19#include <linux/console.h>
 20#include <linux/errno.h>
 21#include <linux/string.h>
 22#include <linux/seq_file.h>
 23#include <linux/init.h>
 24#include <linux/of.h>
 25#include <linux/of_fdt.h>
 26#include <linux/of_address.h>
 27#include <linux/clk-provider.h>
 28#include <linux/memblock.h>
 29#include <linux/screen_info.h>
 30#include <linux/clocksource.h>
 31
 32#include <asm/setup.h>
 33#include <asm/irq.h>
 34#include <asm/sections.h>
 35#include <asm/page.h>
 36
 37#if defined(CONFIG_CPU_H8300H)
 38#define CPU "H8/300H"
 39#elif defined(CONFIG_CPU_H8S)
 40#define CPU "H8S"
 41#else
 42#define CPU "Unknown"
 43#endif
 44
 45unsigned long memory_start;
 46unsigned long memory_end;
 47EXPORT_SYMBOL(memory_end);
 48static unsigned long freq;
 49extern char __dtb_start[];
 50
 51#ifdef CONFIG_VT
 52struct screen_info screen_info;
 53#endif
 54
 55char __initdata command_line[COMMAND_LINE_SIZE];
 56
 57void sim_console_register(void);
 58
 59void __init h8300_fdt_init(void *fdt, char *bootargs)
 60{
 61	if (!fdt)
 62		fdt = __dtb_start;
 63	else
 64		strcpy(command_line, bootargs);
 65
 66	early_init_dt_scan(fdt);
 67	memblock_allow_resize();
 68}
 69
 70static void __init bootmem_init(void)
 71{
 72	memory_end = memory_start = 0;
 73
 74	/* Find main memory where is the kernel */
 75	memory_start = memblock_start_of_DRAM();
 76	memory_end = memblock_end_of_DRAM();
 77
 78	if (!memory_end)
 79		panic("No memory!");
 80
 81	/* setup bootmem globals (we use no_bootmem, but mm still depends on this) */
 82	min_low_pfn = PFN_UP(memory_start);
 83	max_low_pfn = PFN_DOWN(memory_end);
 84	max_pfn = max_low_pfn;
 85
 86	memblock_reserve(__pa(_stext), _end - _stext);
 87
 88	early_init_fdt_reserve_self();
 89	early_init_fdt_scan_reserved_mem();
 90
 91	memblock_dump_all();
 92}
 93
 94void __init setup_arch(char **cmdline_p)
 95{
 96	unflatten_and_copy_device_tree();
 97
 98	setup_initial_init_mm(_stext, _etext, _edata, NULL);
 99
100	pr_notice("\r\n\nuClinux " CPU "\n");
101	pr_notice("Flat model support (C) 1998,1999 Kenneth Albanowski, D. Jeff Dionne\n");
102
103	if (*command_line)
104		strcpy(boot_command_line, command_line);
105	*cmdline_p = boot_command_line;
106
107	parse_early_param();
108
109	bootmem_init();
110	/*
111	 * get kmalloc into gear
112	 */
113	paging_init();
114}
115
116/*
117 *	Get CPU information for use by the procfs.
118 */
119
120static int show_cpuinfo(struct seq_file *m, void *v)
121{
122	char *cpu;
123
124	cpu = CPU;
125
126	seq_printf(m,  "CPU:\t\t%s\n"
127		   "Clock:\t\t%lu.%1luMHz\n"
128		   "BogoMips:\t%lu.%02lu\n"
129		   "Calibration:\t%lu loops\n",
130		   cpu,
131		   freq/1000, freq%1000,
132		   (loops_per_jiffy*HZ)/500000,
133		   ((loops_per_jiffy*HZ)/5000)%100,
134		   (loops_per_jiffy*HZ));
135
136	return 0;
137}
138
139static void *c_start(struct seq_file *m, loff_t *pos)
140{
141	return *pos < num_possible_cpus() ?
142		((void *) 0x12345678) : NULL;
143}
144
145static void *c_next(struct seq_file *m, void *v, loff_t *pos)
146{
147	++*pos;
148	return c_start(m, pos);
149}
150
151static void c_stop(struct seq_file *m, void *v)
152{
153}
154
155const struct seq_operations cpuinfo_op = {
156	.start	= c_start,
157	.next	= c_next,
158	.stop	= c_stop,
159	.show	= show_cpuinfo,
160};
161
162#if defined(CONFIG_CPU_H8300H)
163#define get_wait(base, addr) ({		\
164	int baddr;			\
165	baddr = ((addr) / 0x200000 * 2);			     \
166	w *= (readw((base) + 2) & (3 << baddr)) + 1;		     \
167	})
168#endif
169#if defined(CONFIG_CPU_H8S)
170#define get_wait(base, addr) ({		\
171	int baddr;			\
172	baddr = ((addr) / 0x200000 * 16);			     \
173	w *= (readl((base) + 2) & (7 << baddr)) + 1;	\
174	})
175#endif
176
177static __init int access_timing(void)
178{
179	struct device_node *bsc;
180	void __iomem *base;
181	unsigned long addr = (unsigned long)&__delay;
182	int bit = 1 << (addr / 0x200000);
183	int w;
184
185	bsc = of_find_compatible_node(NULL, NULL, "renesas,h8300-bsc");
186	base = of_iomap(bsc, 0);
187	w = (readb(base + 0) & bit)?2:1;
188	if (readb(base + 1) & bit)
189		w *= get_wait(base, addr);
190	else
191		w *= 2;
192	return w * 3 / 2;
193}
194
195void __init calibrate_delay(void)
196{
197	struct device_node *cpu;
198	int freq;
199
200	cpu = of_find_compatible_node(NULL, NULL, "renesas,h8300");
201	of_property_read_s32(cpu, "clock-frequency", &freq);
202	loops_per_jiffy = freq / HZ / (access_timing() * 2);
203	pr_cont("%lu.%02lu BogoMIPS (lpj=%lu)\n",
204		loops_per_jiffy / (500000 / HZ),
205		(loops_per_jiffy / (5000 / HZ)) % 100, loops_per_jiffy);
206}
207
208
209void __init time_init(void)
210{
211	of_clk_init(NULL);
212	timer_probe();
213}