aboutsummaryrefslogtreecommitdiff
path: root/arch/h8300/kernel/setup.c
blob: d0b1607f2711f577ec194e12127c458a6edd18a2 (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
/*
 *  linux/arch/h8300/kernel/setup.c
 *
 *  Copyleft  ()) 2000       James D. Schettine {james@telos-systems.com}
 *  Copyright (C) 1999,2000  Greg Ungerer (gerg@snapgear.com)
 *  Copyright (C) 1998,1999  D. Jeff Dionne <jeff@lineo.ca>
 *  Copyright (C) 1998       Kenneth Albanowski <kjahds@kjahds.com>
 *  Copyright (C) 1995       Hamish Macdonald
 *  Copyright (C) 2000       Lineo Inc. (www.lineo.com) 
 *  Copyright (C) 2001 	     Lineo, Inc. <www.lineo.com>
 *
 *  H8/300 porting 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/fb.h>
#include <linux/console.h>
#include <linux/genhd.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/major.h>
#include <linux/bootmem.h>
#include <linux/seq_file.h>
#include <linux/init.h>

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

#if defined(__H8300H__)
#define CPU "H8/300H"
#include <asm/regs306x.h>
#endif

#if defined(__H8300S__)
#define CPU "H8S"
#include <asm/regs267x.h>
#endif

#define STUBSIZE 0xc000

unsigned long rom_length;
unsigned long memory_start;
unsigned long memory_end;

char __initdata command_line[COMMAND_LINE_SIZE];

extern int _ramstart, _ramend;
extern char _target_name[];
extern void h8300_gpio_init(void);

#if (defined(CONFIG_H8300H_SIM) || defined(CONFIG_H8S_SIM)) \
    && defined(CONFIG_GDB_MAGICPRINT)
/* printk with gdb service */
static void gdb_console_output(struct console *c, const char *msg, unsigned len)
{
	for (; len > 0; len--) {
		asm("mov.w %0,r2\n\t"
                    "jsr @0xc4"::"r"(*msg++):"er2");
	}
}

/*
 *	Setup initial baud/bits/parity. We do two things here:
 *	- construct a cflag setting for the first rs_open()
 *	- initialize the serial port
 *	Return non-zero if we didn't find a serial port.
 */
static int __init gdb_console_setup(struct console *co, char *options)
{
	return 0;
}

static const struct console gdb_console = {
	.name		= "gdb_con",
	.write		= gdb_console_output,
	.device		= NULL,
	.setup		= gdb_console_setup,
	.flags		= CON_PRINTBUFFER,
	.index		= -1,
};
#endif

void __init setup_arch(char **cmdline_p)
{
	int bootmap_size;

	memory_start = (unsigned long) &_ramstart;

	/* allow for ROMFS on the end of the kernel */
	if (memcmp((void *)memory_start, "-rom1fs-", 8) == 0) {
#if defined(CONFIG_BLK_DEV_INITRD)
		initrd_start = memory_start;
		initrd_end = memory_start += be32_to_cpu(((unsigned long *) (memory_start))[2]);
#else
		memory_start += be32_to_cpu(((unsigned long *) memory_start)[2]);
#endif
	}
	memory_start = PAGE_ALIGN(memory_start);
#if !defined(CONFIG_BLKDEV_RESERVE)
	memory_end = (unsigned long) &_ramend; /* by now the stack is part of the init task */
#if defined(CONFIG_GDB_DEBUG)
	memory_end -= STUBSIZE;
#endif
#else
	if ((memory_end < CONFIG_BLKDEV_RESERVE_ADDRESS) && 
	    (memory_end > CONFIG_BLKDEV_RESERVE_ADDRESS))
	    /* overlap userarea */
	    memory_end = CONFIG_BLKDEV_RESERVE_ADDRESS; 
#endif

	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; 

#if (defined(CONFIG_H8300H_SIM) || defined(CONFIG_H8S_SIM)) && defined(CONFIG_GDB_MAGICPRINT)
	register_console((struct console *)&gdb_console);
#endif

	printk(KERN_INFO "\r\n\nuClinux " CPU "\n");
	printk(KERN_INFO "Target Hardware: %s\n",_target_name);
	printk(KERN_INFO "Flat model support (C) 1998,1999 Kenneth Albanowski, D. Jeff Dionne\n");
	printk(KERN_INFO "H8/300 series support by Yoshinori Sato <ysato@users.sourceforge.jp>\n");

#ifdef DEBUG
	printk(KERN_DEBUG "KERNEL -> TEXT=0x%p-0x%p DATA=0x%p-0x%p "
		"BSS=0x%p-0x%p\n", _stext, _etext, _sdata, _edata, __bss_start,
		__bss_stop);
	printk(KERN_DEBUG "KERNEL -> ROMFS=0x%p-0x%06lx MEM=0x%06lx-0x%06lx "
		"STACK=0x%06lx-0x%p\n", __bss_stop, memory_start, memory_start,
		memory_end, memory_end, &_ramend);
#endif

#ifdef CONFIG_DEFAULT_CMDLINE
	/* set from default command line */
	if (*command_line == '\0')
		strcpy(command_line,CONFIG_KERNEL_COMMAND);
#endif
	/* Keep a copy of command line */
	*cmdline_p = &command_line[0];
	memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
	boot_command_line[COMMAND_LINE_SIZE-1] = 0;

#ifdef DEBUG
	if (strlen(*cmdline_p)) 
		printk(KERN_DEBUG "Command line: '%s'\n", *cmdline_p);
#endif

	/*
	 * 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),
			memory_start >> PAGE_SHIFT, /* map goes here */
			PAGE_OFFSET >> PAGE_SHIFT,	/* 0 on coldfire */
			memory_end >> PAGE_SHIFT);
	/*
	 * 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(memory_start, memory_end - memory_start);
	reserve_bootmem(memory_start, bootmap_size, BOOTMEM_DEFAULT);
	/*
	 * get kmalloc into gear
	 */
	paging_init();
	h8300_gpio_init();
#if defined(CONFIG_H8300_AKI3068NET) && defined(CONFIG_IDE)
	{
#define AREABIT(addr) (1 << (((addr) >> 21) & 7))
		/* setup BSC */
		volatile unsigned char *abwcr = (volatile unsigned char *)ABWCR;
		volatile unsigned char *cscr = (volatile unsigned char *)CSCR;
		*abwcr &= ~(AREABIT(CONFIG_H8300_IDE_BASE) | AREABIT(CONFIG_H8300_IDE_ALT));
		*cscr  |= (AREABIT(CONFIG_H8300_IDE_BASE) | AREABIT(CONFIG_H8300_IDE_ALT)) | 0x0f;
	}
#endif
#ifdef DEBUG
	printk(KERN_DEBUG "Done setup_arch\n");
#endif
}

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

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

    cpu = CPU;
    mode = *(volatile unsigned char *)MDCR & 0x07;

    clockfreq = CONFIG_CPU_CLOCK;

    seq_printf(m,  "CPU:\t\t%s (mode:%d)\n"
		   "Clock:\t\t%lu.%1luMHz\n"
		   "BogoMips:\t%lu.%02lu\n"
		   "Calibration:\t%lu loops\n",
	           cpu,mode,
		   clockfreq/1000,clockfreq%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 < NR_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,
};