1 // SPDX-License-Identifier: GPL-2.0
3 * linux/arch/h8300/kernel/setup.c
5 * Copyright (C) 2001-2014 Yoshinori Sato <ysato@users.sourceforge.jp>
9 * This file handles the architecture-dependent parts of system setup
12 #include <linux/kernel.h>
13 #include <linux/sched.h>
14 #include <linux/delay.h>
15 #include <linux/interrupt.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>
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>
32 #include <asm/setup.h>
34 #include <asm/sections.h>
37 #if defined(CONFIG_CPU_H8300H)
39 #elif defined(CONFIG_CPU_H8S)
45 unsigned long memory_start;
46 unsigned long memory_end;
47 EXPORT_SYMBOL(memory_end);
48 static unsigned long freq;
49 extern char __dtb_start[];
52 struct screen_info screen_info;
55 char __initdata command_line[COMMAND_LINE_SIZE];
57 void sim_console_register(void);
59 void __init h8300_fdt_init(void *fdt, char *bootargs)
64 strcpy(command_line, bootargs);
66 early_init_dt_scan(fdt);
67 memblock_allow_resize();
70 static void __init bootmem_init(void)
72 memory_end = memory_start = 0;
74 /* Find main memory where is the kernel */
75 memory_start = memblock_start_of_DRAM();
76 memory_end = memblock_end_of_DRAM();
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;
86 memblock_reserve(__pa(_stext), _end - _stext);
88 early_init_fdt_reserve_self();
89 early_init_fdt_scan_reserved_mem();
94 void __init setup_arch(char **cmdline_p)
96 unflatten_and_copy_device_tree();
98 init_mm.start_code = (unsigned long) _stext;
99 init_mm.end_code = (unsigned long) _etext;
100 init_mm.end_data = (unsigned long) _edata;
101 init_mm.brk = (unsigned long) 0;
103 pr_notice("\r\n\nuClinux " CPU "\n");
104 pr_notice("Flat model support (C) 1998,1999 Kenneth Albanowski, D. Jeff Dionne\n");
107 strcpy(boot_command_line, command_line);
108 *cmdline_p = boot_command_line;
114 * get kmalloc into gear
120 * Get CPU information for use by the procfs.
123 static int show_cpuinfo(struct seq_file *m, void *v)
129 seq_printf(m, "CPU:\t\t%s\n"
130 "Clock:\t\t%lu.%1luMHz\n"
131 "BogoMips:\t%lu.%02lu\n"
132 "Calibration:\t%lu loops\n",
134 freq/1000, freq%1000,
135 (loops_per_jiffy*HZ)/500000,
136 ((loops_per_jiffy*HZ)/5000)%100,
137 (loops_per_jiffy*HZ));
142 static void *c_start(struct seq_file *m, loff_t *pos)
144 return *pos < num_possible_cpus() ?
145 ((void *) 0x12345678) : NULL;
148 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
151 return c_start(m, pos);
154 static void c_stop(struct seq_file *m, void *v)
158 const struct seq_operations cpuinfo_op = {
162 .show = show_cpuinfo,
165 #if defined(CONFIG_CPU_H8300H)
166 #define get_wait(base, addr) ({ \
168 baddr = ((addr) / 0x200000 * 2); \
169 w *= (readw((base) + 2) & (3 << baddr)) + 1; \
172 #if defined(CONFIG_CPU_H8S)
173 #define get_wait(base, addr) ({ \
175 baddr = ((addr) / 0x200000 * 16); \
176 w *= (readl((base) + 2) & (7 << baddr)) + 1; \
180 static __init int access_timing(void)
182 struct device_node *bsc;
184 unsigned long addr = (unsigned long)&__delay;
185 int bit = 1 << (addr / 0x200000);
188 bsc = of_find_compatible_node(NULL, NULL, "renesas,h8300-bsc");
189 base = of_iomap(bsc, 0);
190 w = (readb(base + 0) & bit)?2:1;
191 if (readb(base + 1) & bit)
192 w *= get_wait(base, addr);
198 void __init calibrate_delay(void)
200 struct device_node *cpu;
203 cpu = of_find_compatible_node(NULL, NULL, "renesas,h8300");
204 of_property_read_s32(cpu, "clock-frequency", &freq);
205 loops_per_jiffy = freq / HZ / (access_timing() * 2);
206 pr_cont("%lu.%02lu BogoMIPS (lpj=%lu)\n",
207 loops_per_jiffy / (500000 / HZ),
208 (loops_per_jiffy / (5000 / HZ)) % 100, loops_per_jiffy);
212 void __init time_init(void)