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	struct memblock_region *region;
 73
 74	memory_end = memory_start = 0;
 75
 76	/* Find main memory where is the kernel */
 77	for_each_memblock(memory, region) {
 78		memory_start = region->base;
 79		memory_end = region->base + region->size;
 80	}
 81
 82	if (!memory_end)
 83		panic("No memory!");
 84
 85	/* setup bootmem globals (we use no_bootmem, but mm still depends on this) */
 86	min_low_pfn = PFN_UP(memory_start);
 87	max_low_pfn = PFN_DOWN(memblock_end_of_DRAM());
 88	max_pfn = max_low_pfn;
 89
 90	memblock_reserve(__pa(_stext), _end - _stext);
 91
 92	early_init_fdt_reserve_self();
 93	early_init_fdt_scan_reserved_mem();
 94
 95	memblock_dump_all();
 96}
 97
 98void __init setup_arch(char **cmdline_p)
 99{
100	unflatten_and_copy_device_tree();
101
102	init_mm.start_code = (unsigned long) _stext;
103	init_mm.end_code = (unsigned long) _etext;
104	init_mm.end_data = (unsigned long) _edata;
105	init_mm.brk = (unsigned long) 0;
106
107	pr_notice("\r\n\nuClinux " CPU "\n");
108	pr_notice("Flat model support (C) 1998,1999 Kenneth Albanowski, D. Jeff Dionne\n");
109
110	if (*command_line)
111		strcpy(boot_command_line, command_line);
112	*cmdline_p = boot_command_line;
113
114	parse_early_param();
115
116	bootmem_init();
117	/*
118	 * get kmalloc into gear
119	 */
120	paging_init();
121}
122
123/*
124 *	Get CPU information for use by the procfs.
125 */
126
127static int show_cpuinfo(struct seq_file *m, void *v)
128{
129	char *cpu;
130
131	cpu = CPU;
132
133	seq_printf(m,  "CPU:\t\t%s\n"
134		   "Clock:\t\t%lu.%1luMHz\n"
135		   "BogoMips:\t%lu.%02lu\n"
136		   "Calibration:\t%lu loops\n",
137		   cpu,
138		   freq/1000, freq%1000,
139		   (loops_per_jiffy*HZ)/500000,
140		   ((loops_per_jiffy*HZ)/5000)%100,
141		   (loops_per_jiffy*HZ));
142
143	return 0;
144}
145
146static void *c_start(struct seq_file *m, loff_t *pos)
147{
148	return *pos < num_possible_cpus() ?
149		((void *) 0x12345678) : NULL;
150}
151
152static void *c_next(struct seq_file *m, void *v, loff_t *pos)
153{
154	++*pos;
155	return c_start(m, pos);
156}
157
158static void c_stop(struct seq_file *m, void *v)
159{
160}
161
162const struct seq_operations cpuinfo_op = {
163	.start	= c_start,
164	.next	= c_next,
165	.stop	= c_stop,
166	.show	= show_cpuinfo,
167};
168
169#if defined(CONFIG_CPU_H8300H)
170#define get_wait(base, addr) ({		\
171	int baddr;			\
172	baddr = ((addr) / 0x200000 * 2);			     \
173	w *= (readw((base) + 2) & (3 << baddr)) + 1;		     \
174	})
175#endif
176#if defined(CONFIG_CPU_H8S)
177#define get_wait(base, addr) ({		\
178	int baddr;			\
179	baddr = ((addr) / 0x200000 * 16);			     \
180	w *= (readl((base) + 2) & (7 << baddr)) + 1;	\
181	})
182#endif
183
184static __init int access_timing(void)
185{
186	struct device_node *bsc;
187	void __iomem *base;
188	unsigned long addr = (unsigned long)&__delay;
189	int bit = 1 << (addr / 0x200000);
190	int w;
191
192	bsc = of_find_compatible_node(NULL, NULL, "renesas,h8300-bsc");
193	base = of_iomap(bsc, 0);
194	w = (readb(base + 0) & bit)?2:1;
195	if (readb(base + 1) & bit)
196		w *= get_wait(base, addr);
197	else
198		w *= 2;
199	return w * 3 / 2;
200}
201
202void __init calibrate_delay(void)
203{
204	struct device_node *cpu;
205	int freq;
206
207	cpu = of_find_compatible_node(NULL, NULL, "renesas,h8300");
208	of_property_read_s32(cpu, "clock-frequency", &freq);
209	loops_per_jiffy = freq / HZ / (access_timing() * 2);
210	pr_cont("%lu.%02lu BogoMIPS (lpj=%lu)\n",
211		loops_per_jiffy / (500000 / HZ),
212		(loops_per_jiffy / (5000 / HZ)) % 100, loops_per_jiffy);
213}
214
215
216void __init time_init(void)
217{
218	of_clk_init(NULL);
219	timer_probe();
220}