1 /* linux/arch/arm/plat-s3c24xx/s3c244x.c
2 *
3 * Copyright (c) 2004-2006 Simtec Electronics
4 * Ben Dooks <ben@simtec.co.uk>
5 *
6 * Samsung S3C2440 and S3C2442 Mobile CPU support (not S3C2443)
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13 #include <linux/kernel.h>
14 #include <linux/types.h>
15 #include <linux/interrupt.h>
16 #include <linux/list.h>
17 #include <linux/timer.h>
18 #include <linux/init.h>
19 #include <linux/serial_core.h>
20 #include <linux/platform_device.h>
21 #include <linux/sysdev.h>
22 #include <linux/clk.h>
23
24 #include <asm/mach/arch.h>
25 #include <asm/mach/map.h>
26 #include <asm/mach/irq.h>
27
28 #include <asm/hardware.h>
29 #include <asm/io.h>
30 #include <asm/irq.h>
31
32 #include <asm/arch/regs-clock.h>
33 #include <asm/plat-s3c/regs-serial.h>
34 #include <asm/arch/regs-gpio.h>
35 #include <asm/arch/regs-gpioj.h>
36 #include <asm/arch/regs-dsc.h>
37
38 #include <asm/plat-s3c24xx/s3c2410.h>
39 #include <asm/plat-s3c24xx/s3c2440.h>
40 #include "s3c244x.h"
41 #include <asm/plat-s3c24xx/clock.h>
42 #include <asm/plat-s3c24xx/devs.h>
43 #include <asm/plat-s3c24xx/cpu.h>
44 #include <asm/plat-s3c24xx/pm.h>
45
46 static struct map_desc s3c244x_iodesc[] __initdata = {
47 IODESC_ENT(CLKPWR),
48 IODESC_ENT(TIMER),
49 IODESC_ENT(WATCHDOG),
50 };
51
52 /* uart initialisation */
53
54 void __init s3c244x_init_uarts(struct s3c2410_uartcfg *cfg, int no)
55 {
56 s3c24xx_init_uartdevs("s3c2440-uart", s3c2410_uart_resources, cfg, no);
57 }
58
59 void __init s3c244x_map_io(struct map_desc *mach_desc, int size)
60 {
61 /* register our io-tables */
62
63 iotable_init(s3c244x_iodesc, ARRAY_SIZE(s3c244x_iodesc));
64 iotable_init(mach_desc, size);
65
66 /* rename any peripherals used differing from the s3c2410 */
67
68 s3c_device_i2c.name = "s3c2440-i2c";
69 s3c_device_nand.name = "s3c2440-nand";
70 s3c_device_usbgadget.name = "s3c2440-usbgadget";
71 }
72
73 void __init s3c244x_init_clocks(int xtal)
74 {
75 unsigned long clkdiv;
76 unsigned long camdiv;
77 unsigned long hclk, fclk, pclk;
78 int hdiv = 1;
79
80 /* now we've got our machine bits initialised, work out what
81 * clocks we've got */
82
83 fclk = s3c2410_get_pll(__raw_readl(S3C2410_MPLLCON), xtal) * 2;
84
85 clkdiv = __raw_readl(S3C2410_CLKDIVN);
86 camdiv = __raw_readl(S3C2440_CAMDIVN);
87
88 /* work out clock scalings */
89
90 switch (clkdiv & S3C2440_CLKDIVN_HDIVN_MASK) {
91 case S3C2440_CLKDIVN_HDIVN_1:
92 hdiv = 1;
93 break;
94
95 case S3C2440_CLKDIVN_HDIVN_2:
96 hdiv = 2;
97 break;
98
99 case S3C2440_CLKDIVN_HDIVN_4_8:
100 hdiv = (camdiv & S3C2440_CAMDIVN_HCLK4_HALF) ? 8 : 4;
101 break;
102
103 case S3C2440_CLKDIVN_HDIVN_3_6:
104 hdiv = (camdiv & S3C2440_CAMDIVN_HCLK3_HALF) ? 6 : 3;
105 break;
106 }
107
108 hclk = fclk / hdiv;
109 pclk = hclk / ((clkdiv & S3C2440_CLKDIVN_PDIVN)? 2:1);
110
111 /* print brief summary of clocks, etc */
112
113 printk("S3C244X: core %ld.%03ld MHz, memory %ld.%03ld MHz, peripheral %ld.%03ld MHz\n",
114 print_mhz(fclk), print_mhz(hclk), print_mhz(pclk));
115
116 /* initialise the clocks here, to allow other things like the
117 * console to use them, and to add new ones after the initialisation
118 */
119
120 s3c24xx_setup_clocks(xtal, fclk, hclk, pclk);
121 s3c2410_baseclk_add();
122 }
123
124 #ifdef CONFIG_PM
125
126 static struct sleep_save s3c244x_sleep[] = {
127 SAVE_ITEM(S3C2440_DSC0),
128 SAVE_ITEM(S3C2440_DSC1),
129 SAVE_ITEM(S3C2440_GPJDAT),
130 SAVE_ITEM(S3C2440_GPJCON),
131 SAVE_ITEM(S3C2440_GPJUP)
132 };
133
134 static int s3c244x_suspend(struct sys_device *dev, pm_message_t state)
135 {
136 s3c2410_pm_do_save(s3c244x_sleep, ARRAY_SIZE(s3c244x_sleep));
137 return 0;
138 }
139
140 static int s3c244x_resume(struct sys_device *dev)
141 {
142 s3c2410_pm_do_restore(s3c244x_sleep, ARRAY_SIZE(s3c244x_sleep));
143 return 0;
144 }
145
146 #else
147 #define s3c244x_suspend NULL
148 #define s3c244x_resume NULL
149 #endif
150
151 /* Since the S3C2442 and S3C2440 share items, put both sysclasses here */
152
153 struct sysdev_class s3c2440_sysclass = {
154 .name = "s3c2440-core",
155 .suspend = s3c244x_suspend,
156 .resume = s3c244x_resume
157 };
158
159 struct sysdev_class s3c2442_sysclass = {
160 .name = "s3c2442-core",
161 .suspend = s3c244x_suspend,
162 .resume = s3c244x_resume
163 };
164
165 /* need to register class before we actually register the device, and
166 * we also need to ensure that it has been initialised before any of the
167 * drivers even try to use it (even if not on an s3c2440 based system)
168 * as a driver which may support both 2410 and 2440 may try and use it.
169 */
170
171 static int __init s3c2440_core_init(void)
172 {
173 return sysdev_class_register(&s3c2440_sysclass);
174 }
175
176 core_initcall(s3c2440_core_init);
177
178 static int __init s3c2442_core_init(void)
179 {
180 return sysdev_class_register(&s3c2442_sysclass);
181 }
182
183 core_initcall(s3c2442_core_init);
184
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