summaryrefslogtreecommitdiffstats
path: root/arch/h8300/kernel/setup.c
blob: 0fd1fe65c0b8bc9710d6aed34a852f4f91618272 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
/*
 *  linux/arch/h8300/kernel/setup.c
 *
 *  Copyright (C) 2001-2014 Yoshinori Sato <ysato@users.sourceforge.jp>
 */

/*
 * This file handles the architecture-dependent parts of system setup
 */

#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/mm.h>
#include <linux/fs.h>
#include <linux/console.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/bootmem.h>
#include <linux/seq_file.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_fdt.h>
#include <linux/of_platform.h>
#include <linux/of_address.h>
#include <linux/clk-provider.h>
#include <linux/memblock.h>
#include <linux/screen_info.h>

#include <asm/setup.h>
#include <asm/irq.h>
#include <asm/pgtable.h>
#include <asm/sections.h>
#include <asm/page.h>

#if defined(CONFIG_CPU_H8300H)
#define CPU "H8/300H"
#elif defined(CONFIG_CPU_H8S)
#define CPU "H8S"
#else
#define CPU "Unknown"
#endif

unsigned long memory_start;
unsigned long memory_end;
EXPORT_SYMBOL(memory_end);
static unsigned long freq;
extern char __dtb_start[];

#ifdef CONFIG_VT
struct screen_info screen_info;
#endif

char __initdata command_line[COMMAND_LINE_SIZE];

void sim_console_register(void);

void __init h8300_fdt_init(void *fdt, char *bootargs)
{
	if (!fdt)
		fdt = __dtb_start;
	else
		strcpy(command_line, bootargs);

	early_init_dt_scan(fdt);
	memblock_allow_resize();
}

static void __init bootmem_init(void)
{
	int bootmap_size;
	unsigned long ram_start_pfn;
	unsigned long free_ram_start_pfn;
	unsigned long ram_end_pfn;
	struct memblock_region *region;

	memory_end = memory_start = 0;

	/* Find main memory where is the kernel */
	for_each_memblock(memory, region) {
		memory_start = region->base;
		memory_end = region->base + region->size;
	}

	if (!memory_end)
		panic("No memory!");

	ram_start_pfn = PFN_UP(memory_start);
	/* free_ram_start_pfn is first page after kernel */
	free_ram_start_pfn = PFN_UP(__pa(_end));
	ram_end_pfn = PFN_DOWN(memblock_end_of_DRAM());

	max_pfn = ram_end_pfn;

	/*
	 * give all the memory to the bootmap allocator,  tell it to put the
	 * boot mem_map at the start of memory
	 */
	bootmap_size = init_bootmem_node(NODE_DATA(0),
					 free_ram_start_pfn,
					 0,
					 ram_end_pfn);
	/*
	 * free the usable memory,  we have to make sure we do not free
	 * the bootmem bitmap so we then reserve it after freeing it :-)
	 */
	free_bootmem(PFN_PHYS(free_ram_start_pfn),
		     (ram_end_pfn - free_ram_start_pfn) << PAGE_SHIFT);
	reserve_bootmem(PFN_PHYS(free_ram_start_pfn), bootmap_size,
			BOOTMEM_DEFAULT);

	for_each_memblock(reserved, region) {
		reserve_bootmem(region->base, region->size, BOOTMEM_DEFAULT);
	}
}

void __init setup_arch(char **cmdline_p)
{
	unflatten_and_copy_device_tree();

	init_mm.start_code = (unsigned long) _stext;
	init_mm.end_code = (unsigned long) _etext;
	init_mm.end_data = (unsigned long) _edata;
	init_mm.brk = (unsigned long) 0;

	pr_notice("\r\n\nuClinux " CPU "\n");
	pr_notice("Flat model support (C) 1998,1999 Kenneth Albanowski, D. Jeff Dionne\n");

	if (*command_line)
		strcpy(boot_command_line, command_line);
	*cmdline_p = boot_command_line;

	parse_early_param();

	bootmem_init();
#if defined(CONFIG_H8300H_SIM) || defined(CONFIG_H8S_SIM)
	sim_console_register();
#endif

	early_platform_driver_probe("earlyprintk", 1, 0);
	/*
	 * get kmalloc into gear
	 */
	paging_init();
}

/*
 *	Get CPU information for use by the procfs.
 */

static int show_cpuinfo(struct seq_file *m, void *v)
{
	char *cpu;

	cpu = CPU;

	seq_printf(m,  "CPU:\t\t%s\n"
		   "Clock:\t\t%lu.%1luMHz\n"
		   "BogoMips:\t%lu.%02lu\n"
		   "Calibration:\t%lu loops\n",
		   cpu,
		   freq/1000, freq%1000,
		   (loops_per_jiffy*HZ)/500000,
		   ((loops_per_jiffy*HZ)/5000)%100,
		   (loops_per_jiffy*HZ));

	return 0;
}

static void *c_start(struct seq_file *m, loff_t *pos)
{
	return *pos < num_possible_cpus() ?
		((void *) 0x12345678) : NULL;
}

static void *c_next(struct seq_file *m, void *v, loff_t *pos)
{
	++*pos;
	return c_start(m, pos);
}

static void c_stop(struct seq_file *m, void *v)
{
}

const struct seq_operations cpuinfo_op = {
	.start	= c_start,
	.next	= c_next,
	.stop	= c_stop,
	.show	= show_cpuinfo,
};

static int __init device_probe(void)
{
	of_platform_populate(NULL, NULL, NULL, NULL);

	return 0;
}

device_initcall(device_probe);

#if defined(CONFIG_CPU_H8300H)
#define get_wait(base, addr) ({		\
	int baddr;			\
	baddr = ((addr) / 0x200000 * 2);			     \
	w *= (ctrl_inw((unsigned long)(base) + 2) & (3 << baddr)) + 1;	\
	})
#endif
#if defined(CONFIG_CPU_H8S)
#define get_wait(base, addr) ({		\
	int baddr;			\
	baddr = ((addr) / 0x200000 * 16);			     \
	w *= (ctrl_inl((unsigned long)(base) + 2) & (7 << baddr)) + 1;	\
	})
#endif

static __init int access_timing(void)
{
	struct device_node *bsc;
	void __iomem *base;
	unsigned long addr = (unsigned long)&__delay;
	int bit = 1 << (addr / 0x200000);
	int w;

	bsc = of_find_compatible_node(NULL, NULL, "renesas,h8300-bsc");
	base = of_iomap(bsc, 0);
	w = (ctrl_inb((unsigned long)base + 0) & bit)?2:1;
	if (ctrl_inb((unsigned long)base + 1) & bit)
		w *= get_wait(base, addr);
	else
		w *= 2;
	return w * 3 / 2;
}

void __init calibrate_delay(void)
{
	struct device_node *cpu;
	int freq;

	cpu = of_find_compatible_node(NULL, NULL, "renesas,h8300");
	of_property_read_s32(cpu, "clock-frequency", &freq);
	loops_per_jiffy = freq / HZ / (access_timing() * 2);
	pr_cont("%lu.%02lu BogoMIPS (lpj=%lu)\n",
		loops_per_jiffy / (500000 / HZ),
		(loops_per_jiffy / (5000 / HZ)) % 100, loops_per_jiffy);
}


void __init time_init(void)
{
	of_clk_init(NULL);
}