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/pgtable.h>
35 #include <asm/sections.h>
36 #include <asm/page.h>
37
38 #if defined(CONFIG_CPU_H8300H)
39 #define CPU "H8/300H"
40 #elif defined(CONFIG_CPU_H8S)
41 #define CPU "H8S"
42 #else
43 #define CPU "Unknown"
44 #endif
45
46 unsigned long memory_start;
47 unsigned long memory_end;
48 EXPORT_SYMBOL(memory_end);
49 static unsigned long freq;
50 extern char __dtb_start[];
51
52 #ifdef CONFIG_VT
53 struct screen_info screen_info;
54 #endif
55
56 char __initdata command_line[COMMAND_LINE_SIZE];
57
58 void sim_console_register(void);
59
h8300_fdt_init(void * fdt,char * bootargs)60 void __init h8300_fdt_init(void *fdt, char *bootargs)
61 {
62 if (!fdt)
63 fdt = __dtb_start;
64 else
65 strcpy(command_line, bootargs);
66
67 early_init_dt_scan(fdt);
68 memblock_allow_resize();
69 }
70
bootmem_init(void)71 static void __init bootmem_init(void)
72 {
73 struct memblock_region *region;
74
75 memory_end = memory_start = 0;
76
77 /* Find main memory where is the kernel */
78 for_each_memblock(memory, region) {
79 memory_start = region->base;
80 memory_end = region->base + region->size;
81 }
82
83 if (!memory_end)
84 panic("No memory!");
85
86 /* setup bootmem globals (we use no_bootmem, but mm still depends on this) */
87 min_low_pfn = PFN_UP(memory_start);
88 max_low_pfn = PFN_DOWN(memblock_end_of_DRAM());
89 max_pfn = max_low_pfn;
90
91 memblock_reserve(__pa(_stext), _end - _stext);
92
93 early_init_fdt_reserve_self();
94 early_init_fdt_scan_reserved_mem();
95
96 memblock_dump_all();
97 }
98
setup_arch(char ** cmdline_p)99 void __init setup_arch(char **cmdline_p)
100 {
101 unflatten_and_copy_device_tree();
102
103 init_mm.start_code = (unsigned long) _stext;
104 init_mm.end_code = (unsigned long) _etext;
105 init_mm.end_data = (unsigned long) _edata;
106 init_mm.brk = (unsigned long) 0;
107
108 pr_notice("\r\n\nuClinux " CPU "\n");
109 pr_notice("Flat model support (C) 1998,1999 Kenneth Albanowski, D. Jeff Dionne\n");
110
111 if (*command_line)
112 strcpy(boot_command_line, command_line);
113 *cmdline_p = boot_command_line;
114
115 parse_early_param();
116
117 bootmem_init();
118 /*
119 * get kmalloc into gear
120 */
121 paging_init();
122 }
123
124 /*
125 * Get CPU information for use by the procfs.
126 */
127
show_cpuinfo(struct seq_file * m,void * v)128 static int show_cpuinfo(struct seq_file *m, void *v)
129 {
130 char *cpu;
131
132 cpu = CPU;
133
134 seq_printf(m, "CPU:\t\t%s\n"
135 "Clock:\t\t%lu.%1luMHz\n"
136 "BogoMips:\t%lu.%02lu\n"
137 "Calibration:\t%lu loops\n",
138 cpu,
139 freq/1000, freq%1000,
140 (loops_per_jiffy*HZ)/500000,
141 ((loops_per_jiffy*HZ)/5000)%100,
142 (loops_per_jiffy*HZ));
143
144 return 0;
145 }
146
c_start(struct seq_file * m,loff_t * pos)147 static void *c_start(struct seq_file *m, loff_t *pos)
148 {
149 return *pos < num_possible_cpus() ?
150 ((void *) 0x12345678) : NULL;
151 }
152
c_next(struct seq_file * m,void * v,loff_t * pos)153 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
154 {
155 ++*pos;
156 return c_start(m, pos);
157 }
158
c_stop(struct seq_file * m,void * v)159 static void c_stop(struct seq_file *m, void *v)
160 {
161 }
162
163 const struct seq_operations cpuinfo_op = {
164 .start = c_start,
165 .next = c_next,
166 .stop = c_stop,
167 .show = show_cpuinfo,
168 };
169
170 #if defined(CONFIG_CPU_H8300H)
171 #define get_wait(base, addr) ({ \
172 int baddr; \
173 baddr = ((addr) / 0x200000 * 2); \
174 w *= (readw((base) + 2) & (3 << baddr)) + 1; \
175 })
176 #endif
177 #if defined(CONFIG_CPU_H8S)
178 #define get_wait(base, addr) ({ \
179 int baddr; \
180 baddr = ((addr) / 0x200000 * 16); \
181 w *= (readl((base) + 2) & (7 << baddr)) + 1; \
182 })
183 #endif
184
access_timing(void)185 static __init int access_timing(void)
186 {
187 struct device_node *bsc;
188 void __iomem *base;
189 unsigned long addr = (unsigned long)&__delay;
190 int bit = 1 << (addr / 0x200000);
191 int w;
192
193 bsc = of_find_compatible_node(NULL, NULL, "renesas,h8300-bsc");
194 base = of_iomap(bsc, 0);
195 w = (readb(base + 0) & bit)?2:1;
196 if (readb(base + 1) & bit)
197 w *= get_wait(base, addr);
198 else
199 w *= 2;
200 return w * 3 / 2;
201 }
202
calibrate_delay(void)203 void __init calibrate_delay(void)
204 {
205 struct device_node *cpu;
206 int freq;
207
208 cpu = of_find_compatible_node(NULL, NULL, "renesas,h8300");
209 of_property_read_s32(cpu, "clock-frequency", &freq);
210 loops_per_jiffy = freq / HZ / (access_timing() * 2);
211 pr_cont("%lu.%02lu BogoMIPS (lpj=%lu)\n",
212 loops_per_jiffy / (500000 / HZ),
213 (loops_per_jiffy / (5000 / HZ)) % 100, loops_per_jiffy);
214 }
215
216
time_init(void)217 void __init time_init(void)
218 {
219 of_clk_init(NULL);
220 timer_probe();
221 }
222