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 #include <linux/io.h>
24
25 #include <asm/mach/arch.h>
26 #include <asm/mach/map.h>
27 #include <asm/mach/irq.h>
28
29 #include <mach/hardware.h>
30 #include <asm/irq.h>
31
32 #include <plat/cpu-freq.h>
33
34 #include <mach/regs-clock.h>
35 #include <plat/regs-serial.h>
36 #include <mach/regs-gpio.h>
37 #include <mach/regs-gpioj.h>
38 #include <mach/regs-dsc.h>
39
40 #include <plat/s3c2410.h>
41 #include <plat/s3c2440.h>
42 #include "s3c244x.h"
43 #include <plat/clock.h>
44 #include <plat/devs.h>
45 #include <plat/cpu.h>
46 #include <plat/pm.h>
47 #include <plat/pll.h>
48
49 static struct map_desc s3c244x_iodesc[] __initdata = {
50 IODESC_ENT(CLKPWR),
51 IODESC_ENT(TIMER),
52 IODESC_ENT(WATCHDOG),
53 };
54
55 /* uart initialisation */
56
s3c244x_init_uarts(struct s3c2410_uartcfg * cfg,int no)57 void __init s3c244x_init_uarts(struct s3c2410_uartcfg *cfg, int no)
58 {
59 s3c24xx_init_uartdevs("s3c2440-uart", s3c2410_uart_resources, cfg, no);
60 }
61
s3c244x_map_io(void)62 void __init s3c244x_map_io(void)
63 {
64 /* register our io-tables */
65
66 iotable_init(s3c244x_iodesc, ARRAY_SIZE(s3c244x_iodesc));
67
68 /* rename any peripherals used differing from the s3c2410 */
69
70 s3c_device_sdi.name = "s3c2440-sdi";
71 s3c_device_i2c0.name = "s3c2440-i2c";
72 s3c_device_nand.name = "s3c2440-nand";
73 s3c_device_usbgadget.name = "s3c2440-usbgadget";
74 }
75
s3c244x_setup_clocks(void)76 void __init_or_cpufreq s3c244x_setup_clocks(void)
77 {
78 struct clk *xtal_clk;
79 unsigned long clkdiv;
80 unsigned long camdiv;
81 unsigned long xtal;
82 unsigned long hclk, fclk, pclk;
83 int hdiv = 1;
84
85 xtal_clk = clk_get(NULL, "xtal");
86 xtal = clk_get_rate(xtal_clk);
87 clk_put(xtal_clk);
88
89 fclk = s3c24xx_get_pll(__raw_readl(S3C2410_MPLLCON), xtal) * 2;
90
91 clkdiv = __raw_readl(S3C2410_CLKDIVN);
92 camdiv = __raw_readl(S3C2440_CAMDIVN);
93
94 /* work out clock scalings */
95
96 switch (clkdiv & S3C2440_CLKDIVN_HDIVN_MASK) {
97 case S3C2440_CLKDIVN_HDIVN_1:
98 hdiv = 1;
99 break;
100
101 case S3C2440_CLKDIVN_HDIVN_2:
102 hdiv = 2;
103 break;
104
105 case S3C2440_CLKDIVN_HDIVN_4_8:
106 hdiv = (camdiv & S3C2440_CAMDIVN_HCLK4_HALF) ? 8 : 4;
107 break;
108
109 case S3C2440_CLKDIVN_HDIVN_3_6:
110 hdiv = (camdiv & S3C2440_CAMDIVN_HCLK3_HALF) ? 6 : 3;
111 break;
112 }
113
114 hclk = fclk / hdiv;
115 pclk = hclk / ((clkdiv & S3C2440_CLKDIVN_PDIVN) ? 2 : 1);
116
117 /* print brief summary of clocks, etc */
118
119 printk("S3C244X: core %ld.%03ld MHz, memory %ld.%03ld MHz, peripheral %ld.%03ld MHz\n",
120 print_mhz(fclk), print_mhz(hclk), print_mhz(pclk));
121
122 s3c24xx_setup_clocks(fclk, hclk, pclk);
123 }
124
s3c244x_init_clocks(int xtal)125 void __init s3c244x_init_clocks(int xtal)
126 {
127 /* initialise the clocks here, to allow other things like the
128 * console to use them, and to add new ones after the initialisation
129 */
130
131 s3c24xx_register_baseclocks(xtal);
132 s3c244x_setup_clocks();
133 s3c2410_baseclk_add();
134 }
135
136 #ifdef CONFIG_PM
137
138 static struct sleep_save s3c244x_sleep[] = {
139 SAVE_ITEM(S3C2440_DSC0),
140 SAVE_ITEM(S3C2440_DSC1),
141 SAVE_ITEM(S3C2440_GPJDAT),
142 SAVE_ITEM(S3C2440_GPJCON),
143 SAVE_ITEM(S3C2440_GPJUP)
144 };
145
s3c244x_suspend(struct sys_device * dev,pm_message_t state)146 static int s3c244x_suspend(struct sys_device *dev, pm_message_t state)
147 {
148 s3c2410_pm_do_save(s3c244x_sleep, ARRAY_SIZE(s3c244x_sleep));
149 return 0;
150 }
151
s3c244x_resume(struct sys_device * dev)152 static int s3c244x_resume(struct sys_device *dev)
153 {
154 s3c2410_pm_do_restore(s3c244x_sleep, ARRAY_SIZE(s3c244x_sleep));
155 return 0;
156 }
157
158 #else
159 #define s3c244x_suspend NULL
160 #define s3c244x_resume NULL
161 #endif
162
163 /* Since the S3C2442 and S3C2440 share items, put both sysclasses here */
164
165 struct sysdev_class s3c2440_sysclass = {
166 .name = "s3c2440-core",
167 .suspend = s3c244x_suspend,
168 .resume = s3c244x_resume
169 };
170
171 struct sysdev_class s3c2442_sysclass = {
172 .name = "s3c2442-core",
173 .suspend = s3c244x_suspend,
174 .resume = s3c244x_resume
175 };
176
177 /* need to register class before we actually register the device, and
178 * we also need to ensure that it has been initialised before any of the
179 * drivers even try to use it (even if not on an s3c2440 based system)
180 * as a driver which may support both 2410 and 2440 may try and use it.
181 */
182
s3c2440_core_init(void)183 static int __init s3c2440_core_init(void)
184 {
185 return sysdev_class_register(&s3c2440_sysclass);
186 }
187
188 core_initcall(s3c2440_core_init);
189
s3c2442_core_init(void)190 static int __init s3c2442_core_init(void)
191 {
192 return sysdev_class_register(&s3c2442_sysclass);
193 }
194
195 core_initcall(s3c2442_core_init);
196