aboutsummaryrefslogtreecommitdiff
path: root/arch/arm/mach-s3c24xx/s3c2410.c
blob: 9ebef95da721d4fcd81650a04127609d170fb2cd (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
/* linux/arch/arm/mach-s3c2410/s3c2410.c
 *
 * Copyright (c) 2003-2005 Simtec Electronics
 *	Ben Dooks <ben@simtec.co.uk>
 *
 * http://www.simtec.co.uk/products/EB2410ITX/
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
*/

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/list.h>
#include <linux/timer.h>
#include <linux/init.h>
#include <linux/gpio.h>
#include <linux/clk.h>
#include <linux/device.h>
#include <linux/syscore_ops.h>
#include <linux/serial_core.h>
#include <linux/platform_device.h>
#include <linux/io.h>

#include <asm/mach/arch.h>
#include <asm/mach/map.h>
#include <asm/mach/irq.h>

#include <mach/hardware.h>
#include <asm/irq.h>
#include <asm/system_misc.h>

#include <plat/cpu-freq.h>

#include <mach/regs-clock.h>
#include <plat/regs-serial.h>

#include <plat/s3c2410.h>
#include <plat/cpu.h>
#include <plat/devs.h>
#include <plat/clock.h>
#include <plat/pll.h>
#include <plat/pm.h>
#include <plat/watchdog-reset.h>

#include <plat/gpio-core.h>
#include <plat/gpio-cfg.h>
#include <plat/gpio-cfg-helpers.h>

#include "common.h"

/* Initial IO mappings */

static struct map_desc s3c2410_iodesc[] __initdata = {
	IODESC_ENT(CLKPWR),
	IODESC_ENT(TIMER),
	IODESC_ENT(WATCHDOG),
};

/* our uart devices */

/* uart registration process */

void __init s3c2410_init_uarts(struct s3c2410_uartcfg *cfg, int no)
{
	s3c24xx_init_uartdevs("s3c2410-uart", s3c2410_uart_resources, cfg, no);
}

/* s3c2410_map_io
 *
 * register the standard cpu IO areas, and any passed in from the
 * machine specific initialisation.
*/

void __init s3c2410_map_io(void)
{
	s3c24xx_gpiocfg_default.set_pull = s3c24xx_gpio_setpull_1up;
	s3c24xx_gpiocfg_default.get_pull = s3c24xx_gpio_getpull_1up;

	iotable_init(s3c2410_iodesc, ARRAY_SIZE(s3c2410_iodesc));
}

void __init_or_cpufreq s3c2410_setup_clocks(void)
{
	struct clk *xtal_clk;
	unsigned long tmp;
	unsigned long xtal;
	unsigned long fclk;
	unsigned long hclk;
	unsigned long pclk;

	xtal_clk = clk_get(NULL, "xtal");
	xtal = clk_get_rate(xtal_clk);
	clk_put(xtal_clk);

	/* now we've got our machine bits initialised, work out what
	 * clocks we've got */

	fclk = s3c24xx_get_pll(__raw_readl(S3C2410_MPLLCON), xtal);

	tmp = __raw_readl(S3C2410_CLKDIVN);

	/* work out clock scalings */

	hclk = fclk / ((tmp & S3C2410_CLKDIVN_HDIVN) ? 2 : 1);
	pclk = hclk / ((tmp & S3C2410_CLKDIVN_PDIVN) ? 2 : 1);

	/* print brieft summary of clocks, etc */

	printk("S3C2410: core %ld.%03ld MHz, memory %ld.%03ld MHz, peripheral %ld.%03ld MHz\n",
	       print_mhz(fclk), print_mhz(hclk), print_mhz(pclk));

	/* initialise the clocks here, to allow other things like the
	 * console to use them
	 */

	s3c24xx_setup_clocks(fclk, hclk, pclk);
}

/* fake ARMCLK for use with cpufreq, etc. */

static struct clk s3c2410_armclk = {
	.name	= "armclk",
	.parent	= &clk_f,
	.id	= -1,
};

static struct clk_lookup s3c2410_clk_lookup[] = {
	CLKDEV_INIT(NULL, "clk_uart_baud0", &clk_p),
	CLKDEV_INIT(NULL, "clk_uart_baud1", &s3c24xx_uclk),
};

void __init s3c2410_init_clocks(int xtal)
{
	s3c24xx_register_baseclocks(xtal);
	s3c2410_setup_clocks();
	s3c2410_baseclk_add();
	s3c24xx_register_clock(&s3c2410_armclk);
	clkdev_add_table(s3c2410_clk_lookup, ARRAY_SIZE(s3c2410_clk_lookup));
}

struct bus_type s3c2410_subsys = {
	.name = "s3c2410-core",
	.dev_name = "s3c2410-core",
};

/* Note, we would have liked to name this s3c2410-core, but we cannot
 * register two subsystems with the same name.
 */
struct bus_type s3c2410a_subsys = {
	.name = "s3c2410a-core",
	.dev_name = "s3c2410a-core",
};

static struct device s3c2410_dev = {
	.bus		= &s3c2410_subsys,
};

/* need to register the subsystem before we actually register the device, and
 * we also need to ensure that it has been initialised before any of the
 * drivers even try to use it (even if not on an s3c2410 based system)
 * as a driver which may support both 2410 and 2440 may try and use it.
*/

static int __init s3c2410_core_init(void)
{
	return subsys_system_register(&s3c2410_subsys, NULL);
}

core_initcall(s3c2410_core_init);

static int __init s3c2410a_core_init(void)
{
	return subsys_system_register(&s3c2410a_subsys, NULL);
}

core_initcall(s3c2410a_core_init);

int __init s3c2410_init(void)
{
	printk("S3C2410: Initialising architecture\n");

#ifdef CONFIG_PM
	register_syscore_ops(&s3c2410_pm_syscore_ops);
	register_syscore_ops(&s3c24xx_irq_syscore_ops);
#endif

	return device_register(&s3c2410_dev);
}

int __init s3c2410a_init(void)
{
	s3c2410_dev.bus = &s3c2410a_subsys;
	return s3c2410_init();
}

void s3c2410_restart(char mode, const char *cmd)
{
	if (mode == 's') {
		soft_restart(0);
	}

	arch_wdt_reset();

	/* we'll take a jump through zero as a poor second */
	soft_restart(0);
}