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
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
h8300_fdt_init(void * fdt,char * bootargs)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
bootmem_init(void)70 static 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
setup_arch(char ** cmdline_p)94 void __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
show_cpuinfo(struct seq_file * m,void * v)120 static 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
c_start(struct seq_file * m,loff_t * pos)139 static void *c_start(struct seq_file *m, loff_t *pos)
140 {
141 return *pos < num_possible_cpus() ?
142 ((void *) 0x12345678) : NULL;
143 }
144
c_next(struct seq_file * m,void * v,loff_t * pos)145 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
146 {
147 ++*pos;
148 return c_start(m, pos);
149 }
150
c_stop(struct seq_file * m,void * v)151 static void c_stop(struct seq_file *m, void *v)
152 {
153 }
154
155 const 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
access_timing(void)177 static __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
calibrate_delay(void)195 void __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
time_init(void)209 void __init time_init(void)
210 {
211 of_clk_init(NULL);
212 timer_probe();
213 }
214