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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
d8b0bdb4 YS |
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/mm.h> | |
17 | #include <linux/fs.h> | |
18 | #include <linux/console.h> | |
19 | #include <linux/errno.h> | |
20 | #include <linux/string.h> | |
d8b0bdb4 YS |
21 | #include <linux/seq_file.h> |
22 | #include <linux/init.h> | |
d8b0bdb4 YS |
23 | #include <linux/of.h> |
24 | #include <linux/of_fdt.h> | |
d8b0bdb4 YS |
25 | #include <linux/of_address.h> |
26 | #include <linux/clk-provider.h> | |
27 | #include <linux/memblock.h> | |
28 | #include <linux/screen_info.h> | |
f639eeb4 | 29 | #include <linux/clocksource.h> |
d8b0bdb4 YS |
30 | |
31 | #include <asm/setup.h> | |
32 | #include <asm/irq.h> | |
33 | #include <asm/pgtable.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 | ||
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[]; | |
50 | ||
51 | #ifdef CONFIG_VT | |
52 | struct screen_info screen_info; | |
53 | #endif | |
54 | ||
55 | char __initdata command_line[COMMAND_LINE_SIZE]; | |
56 | ||
57 | void sim_console_register(void); | |
58 | ||
59 | void __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 | ||
70 | static void __init bootmem_init(void) | |
71 | { | |
d8b0bdb4 YS |
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 | ||
c489dfef RH |
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; | |
d8b0bdb4 | 89 | |
c489dfef | 90 | memblock_reserve(__pa(_stext), _end - _stext); |
d8b0bdb4 | 91 | |
c489dfef RH |
92 | early_init_fdt_reserve_self(); |
93 | early_init_fdt_scan_reserved_mem(); | |
d8b0bdb4 | 94 | |
c489dfef | 95 | memblock_dump_all(); |
d8b0bdb4 YS |
96 | } |
97 | ||
98 | void __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(); | |
d8b0bdb4 YS |
117 | /* |
118 | * get kmalloc into gear | |
119 | */ | |
120 | paging_init(); | |
121 | } | |
122 | ||
123 | /* | |
124 | * Get CPU information for use by the procfs. | |
125 | */ | |
126 | ||
127 | static 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 | ||
146 | static void *c_start(struct seq_file *m, loff_t *pos) | |
147 | { | |
148 | return *pos < num_possible_cpus() ? | |
149 | ((void *) 0x12345678) : NULL; | |
150 | } | |
151 | ||
152 | static void *c_next(struct seq_file *m, void *v, loff_t *pos) | |
153 | { | |
154 | ++*pos; | |
155 | return c_start(m, pos); | |
156 | } | |
157 | ||
158 | static void c_stop(struct seq_file *m, void *v) | |
159 | { | |
160 | } | |
161 | ||
162 | const struct seq_operations cpuinfo_op = { | |
163 | .start = c_start, | |
164 | .next = c_next, | |
165 | .stop = c_stop, | |
166 | .show = show_cpuinfo, | |
167 | }; | |
168 | ||
d8b0bdb4 YS |
169 | #if defined(CONFIG_CPU_H8300H) |
170 | #define get_wait(base, addr) ({ \ | |
171 | int baddr; \ | |
172 | baddr = ((addr) / 0x200000 * 2); \ | |
75160515 | 173 | w *= (readw((base) + 2) & (3 << baddr)) + 1; \ |
d8b0bdb4 YS |
174 | }) |
175 | #endif | |
176 | #if defined(CONFIG_CPU_H8S) | |
177 | #define get_wait(base, addr) ({ \ | |
178 | int baddr; \ | |
179 | baddr = ((addr) / 0x200000 * 16); \ | |
75160515 | 180 | w *= (readl((base) + 2) & (7 << baddr)) + 1; \ |
d8b0bdb4 YS |
181 | }) |
182 | #endif | |
183 | ||
184 | static __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); | |
75160515 DL |
194 | w = (readb(base + 0) & bit)?2:1; |
195 | if (readb(base + 1) & bit) | |
d8b0bdb4 YS |
196 | w *= get_wait(base, addr); |
197 | else | |
198 | w *= 2; | |
199 | return w * 3 / 2; | |
200 | } | |
201 | ||
202 | void __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 | ||
216 | void __init time_init(void) | |
217 | { | |
218 | of_clk_init(NULL); | |
ba5d08c0 | 219 | timer_probe(); |
d8b0bdb4 | 220 | } |