aboutsummaryrefslogtreecommitdiffstats
path: root/arch/arm/mach-s3c2410/s3c2440.c
blob: 54681740f9f1ce5aacba039a3892c48edae7a08e (plain) (blame)
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
/* linux/arch/arm/mach-s3c2410/s3c2440.c
 *
 * Copyright (c) 2004-2005 Simtec Electronics
 *   Ben Dooks <ben@simtec.co.uk>
 *
 * Samsung S3C2440 Mobile CPU support
 *
 * 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.
 *
 * Modifications:
 *	24-Aug-2004 BJD  Start of s3c2440 support
 *	12-Oct-2004 BJD	 Moved clock info out to clock.c
 *	01-Nov-2004 BJD  Fixed clock build code
 *	09-Nov-2004 BJD  Added sysdev for power management
 *	04-Nov-2004 BJD  New serial registration
 *	15-Nov-2004 BJD  Rename the i2c device for the s3c2440
 *	14-Jan-2005 BJD  Moved clock init code into seperate function
 *	14-Jan-2005 BJD  Removed un-used clock bits
*/

#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/platform_device.h>
#include <linux/sysdev.h>
#include <linux/clk.h>

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

#include <asm/hardware.h>
#include <asm/io.h>
#include <asm/irq.h>

#include <asm/arch/regs-clock.h>
#include <asm/arch/regs-serial.h>
#include <asm/arch/regs-gpio.h>
#include <asm/arch/regs-gpioj.h>
#include <asm/arch/regs-dsc.h>

#include "s3c2440.h"
#include "clock.h"
#include "devs.h"
#include "cpu.h"
#include "pm.h"


static struct map_desc s3c2440_iodesc[] __initdata = {
	IODESC_ENT(USBHOST),
	IODESC_ENT(CLKPWR),
	IODESC_ENT(LCD),
	IODESC_ENT(TIMER),
	IODESC_ENT(ADC),
	IODESC_ENT(WATCHDOG),
};

/* uart initialisation */

void __init s3c2440_init_uarts(struct s3c2410_uartcfg *cfg, int no)
{
	s3c24xx_init_uartdevs("s3c2440-uart", s3c2410_uart_resources, cfg, no);
}

#ifdef CONFIG_PM

static struct sleep_save s3c2440_sleep[] = {
	SAVE_ITEM(S3C2440_DSC0),
	SAVE_ITEM(S3C2440_DSC1),
	SAVE_ITEM(S3C2440_GPJDAT),
	SAVE_ITEM(S3C2440_GPJCON),
	SAVE_ITEM(S3C2440_GPJUP)
};

static int s3c2440_suspend(struct sys_device *dev, pm_message_t state)
{
	s3c2410_pm_do_save(s3c2440_sleep, ARRAY_SIZE(s3c2440_sleep));
	return 0;
}

static int s3c2440_resume(struct sys_device *dev)
{
	s3c2410_pm_do_restore(s3c2440_sleep, ARRAY_SIZE(s3c2440_sleep));
	return 0;
}

#else
#define s3c2440_suspend NULL
#define s3c2440_resume  NULL
#endif

struct sysdev_class s3c2440_sysclass = {
	set_kset_name("s3c2440-core"),
	.suspend	= s3c2440_suspend,
	.resume		= s3c2440_resume
};

static struct sys_device s3c2440_sysdev = {
	.cls		= &s3c2440_sysclass,
};

void __init s3c2440_map_io(struct map_desc *mach_desc, int size)
{
	/* register our io-tables */

	iotable_init(s3c2440_iodesc, ARRAY_SIZE(s3c2440_iodesc));
	iotable_init(mach_desc, size);

	/* rename any peripherals used differing from the s3c2410 */

	s3c_device_i2c.name  = "s3c2440-i2c";
	s3c_device_nand.name = "s3c2440-nand";

	/* change irq for watchdog */

	s3c_device_wdt.resource[1].start = IRQ_S3C2440_WDT;
	s3c_device_wdt.resource[1].end   = IRQ_S3C2440_WDT;
}

void __init s3c2440_init_clocks(int xtal)
{
	unsigned long clkdiv;
	unsigned long camdiv;
	unsigned long hclk, fclk, pclk;
	int hdiv = 1;

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

	fclk = s3c2410_get_pll(__raw_readl(S3C2410_MPLLCON), xtal) * 2;

	clkdiv = __raw_readl(S3C2410_CLKDIVN);
	camdiv = __raw_readl(S3C2440_CAMDIVN);

	/* work out clock scalings */

	switch (clkdiv & S3C2440_CLKDIVN_HDIVN_MASK) {
	case S3C2440_CLKDIVN_HDIVN_1:
		hdiv = 1;
		break;

	case S3C2440_CLKDIVN_HDIVN_2:
		hdiv = 2;
		break;

	case S3C2440_CLKDIVN_HDIVN_4_8:
		hdiv = (camdiv & S3C2440_CAMDIVN_HCLK4_HALF) ? 8 : 4;
		break;

	case S3C2440_CLKDIVN_HDIVN_3_6:
		hdiv = (camdiv & S3C2440_CAMDIVN_HCLK3_HALF) ? 6 : 3;
		break;
	}

	hclk = fclk / hdiv;
	pclk = hclk / ((clkdiv & S3C2440_CLKDIVN_PDIVN)? 2:1);

	/* print brief summary of clocks, etc */

	printk("S3C2440: 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, and to add new ones after the initialisation
	 */

	s3c24xx_setup_clocks(xtal, fclk, hclk, pclk);
}

/* need to register class 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 s3c2440 based system)
 * as a driver which may support both 2410 and 2440 may try and use it.
*/

static int __init s3c2440_core_init(void)
{
	return sysdev_class_register(&s3c2440_sysclass);
}

core_initcall(s3c2440_core_init);

int __init s3c2440_init(void)
{
	printk("S3C2440: Initialising architecture\n");

	return sysdev_register(&s3c2440_sysdev);
}