1 /* linux/arch/arm/plat-s3c24xx/s3c244x.c
3 * Copyright (c) 2004-2006 Simtec Electronics
4 * Ben Dooks <ben@simtec.co.uk>
6 * Samsung S3C2440 and S3C2442 Mobile CPU support (not S3C2443)
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.
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/serial_s3c.h>
21 #include <linux/platform_device.h>
22 #include <linux/reboot.h>
23 #include <linux/device.h>
24 #include <linux/syscore_ops.h>
25 #include <linux/clk.h>
28 #include <asm/system_misc.h>
29 #include <asm/mach/arch.h>
30 #include <asm/mach/map.h>
31 #include <asm/mach/irq.h>
33 #include <mach/hardware.h>
36 #include <plat/cpu-freq.h>
38 #include <mach/regs-clock.h>
39 #include <mach/regs-gpio.h>
41 #include <plat/clock.h>
42 #include <plat/devs.h>
46 #include <plat/nand-core.h>
47 #include <plat/watchdog-reset.h>
52 static struct map_desc s3c244x_iodesc[] __initdata = {
58 /* uart initialisation */
60 void __init s3c244x_init_uarts(struct s3c2410_uartcfg *cfg, int no)
62 s3c24xx_init_uartdevs("s3c2440-uart", s3c2410_uart_resources, cfg, no);
65 void __init s3c244x_map_io(void)
67 /* register our io-tables */
69 iotable_init(s3c244x_iodesc, ARRAY_SIZE(s3c244x_iodesc));
71 /* rename any peripherals used differing from the s3c2410 */
73 s3c_device_sdi.name = "s3c2440-sdi";
74 s3c_device_i2c0.name = "s3c2440-i2c";
75 s3c_nand_setname("s3c2440-nand");
76 s3c_device_ts.name = "s3c2440-ts";
77 s3c_device_usbgadget.name = "s3c2440-usbgadget";
78 s3c2410_device_dclk.name = "s3c2440-dclk";
81 void __init_or_cpufreq s3c244x_setup_clocks(void)
87 unsigned long hclk, fclk, pclk;
90 xtal_clk = clk_get(NULL, "xtal");
91 xtal = clk_get_rate(xtal_clk);
94 fclk = s3c24xx_get_pll(__raw_readl(S3C2410_MPLLCON), xtal) * 2;
96 clkdiv = __raw_readl(S3C2410_CLKDIVN);
97 camdiv = __raw_readl(S3C2440_CAMDIVN);
99 /* work out clock scalings */
101 switch (clkdiv & S3C2440_CLKDIVN_HDIVN_MASK) {
102 case S3C2440_CLKDIVN_HDIVN_1:
106 case S3C2440_CLKDIVN_HDIVN_2:
110 case S3C2440_CLKDIVN_HDIVN_4_8:
111 hdiv = (camdiv & S3C2440_CAMDIVN_HCLK4_HALF) ? 8 : 4;
114 case S3C2440_CLKDIVN_HDIVN_3_6:
115 hdiv = (camdiv & S3C2440_CAMDIVN_HCLK3_HALF) ? 6 : 3;
120 pclk = hclk / ((clkdiv & S3C2440_CLKDIVN_PDIVN) ? 2 : 1);
122 /* print brief summary of clocks, etc */
124 printk("S3C244X: core %ld.%03ld MHz, memory %ld.%03ld MHz, peripheral %ld.%03ld MHz\n",
125 print_mhz(fclk), print_mhz(hclk), print_mhz(pclk));
127 s3c24xx_setup_clocks(fclk, hclk, pclk);
130 void __init s3c244x_init_clocks(int xtal)
132 /* initialise the clocks here, to allow other things like the
133 * console to use them, and to add new ones after the initialisation
136 s3c24xx_register_baseclocks(xtal);
137 s3c244x_setup_clocks();
138 s3c2410_baseclk_add();
139 samsung_wdt_reset_init(S3C24XX_VA_WATCHDOG);
142 /* Since the S3C2442 and S3C2440 share items, put both subsystems here */
144 struct bus_type s3c2440_subsys = {
145 .name = "s3c2440-core",
146 .dev_name = "s3c2440-core",
149 struct bus_type s3c2442_subsys = {
150 .name = "s3c2442-core",
151 .dev_name = "s3c2442-core",
154 /* need to register the subsystem before we actually register the device, and
155 * we also need to ensure that it has been initialised before any of the
156 * drivers even try to use it (even if not on an s3c2440 based system)
157 * as a driver which may support both 2410 and 2440 may try and use it.
160 static int __init s3c2440_core_init(void)
162 return subsys_system_register(&s3c2440_subsys, NULL);
165 core_initcall(s3c2440_core_init);
167 static int __init s3c2442_core_init(void)
169 return subsys_system_register(&s3c2442_subsys, NULL);
172 core_initcall(s3c2442_core_init);
176 static struct sleep_save s3c244x_sleep[] = {
177 SAVE_ITEM(S3C2440_DSC0),
178 SAVE_ITEM(S3C2440_DSC1),
179 SAVE_ITEM(S3C2440_GPJDAT),
180 SAVE_ITEM(S3C2440_GPJCON),
181 SAVE_ITEM(S3C2440_GPJUP)
184 static int s3c244x_suspend(void)
186 s3c_pm_do_save(s3c244x_sleep, ARRAY_SIZE(s3c244x_sleep));
190 static void s3c244x_resume(void)
192 s3c_pm_do_restore(s3c244x_sleep, ARRAY_SIZE(s3c244x_sleep));
195 #define s3c244x_suspend NULL
196 #define s3c244x_resume NULL
199 struct syscore_ops s3c244x_pm_syscore_ops = {
200 .suspend = s3c244x_suspend,
201 .resume = s3c244x_resume,
204 void s3c244x_restart(enum reboot_mode mode, const char *cmd)
206 if (mode == REBOOT_SOFT)
211 /* we'll take a jump through zero as a poor second */