1 /* linux/arch/arm/mach-s3c2410/s3c2412.c
3 * Copyright (c) 2006 Simtec Electronics
4 * Ben Dooks <ben@simtec.co.uk>
6 * http://armlinux.simtec.co.uk/.
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/sysdev.h>
20 #include <linux/serial_core.h>
21 #include <linux/platform_device.h>
23 #include <asm/mach/arch.h>
24 #include <asm/mach/map.h>
25 #include <asm/mach/irq.h>
27 #include <asm/hardware.h>
28 #include <asm/proc-fns.h>
32 #include <asm/arch/idle.h>
34 #include <asm/arch/regs-clock.h>
35 #include <asm/arch/regs-serial.h>
36 #include <asm/arch/regs-power.h>
37 #include <asm/arch/regs-gpio.h>
38 #include <asm/arch/regs-gpioj.h>
39 #include <asm/arch/regs-dsc.h>
47 #ifndef CONFIG_CPU_S3C2412_ONLY
48 void __iomem *s3c24xx_va_gpio2 = S3C24XX_VA_GPIO;
50 static inline void s3c2412_init_gpio2(void)
52 s3c24xx_va_gpio2 = S3C24XX_VA_GPIO + 0x10;
55 #define s3c2412_init_gpio2() do { } while(0)
58 /* Initial IO mappings */
60 static struct map_desc s3c2412_iodesc[] __initdata = {
67 /* uart registration process */
69 void __init s3c2412_init_uarts(struct s3c2410_uartcfg *cfg, int no)
71 s3c24xx_init_uartdevs("s3c2412-uart", s3c2410_uart_resources, cfg, no);
73 /* rename devices that are s3c2412/s3c2413 specific */
74 s3c_device_sdi.name = "s3c2412-sdi";
75 s3c_device_lcd.name = "s3c2412-lcd";
76 s3c_device_nand.name = "s3c2412-nand";
81 * use the standard idle call by ensuring the idle mode
82 * in power config, then issuing the idle co-processor
86 static void s3c2412_idle(void)
90 /* ensure our idle mode is to go to idle */
92 tmp = __raw_readl(S3C2412_PWRCFG);
93 tmp &= ~S3C2412_PWRCFG_STANDBYWFI_MASK;
94 tmp |= S3C2412_PWRCFG_STANDBYWFI_IDLE;
95 __raw_writel(tmp, S3C2412_PWRCFG);
102 * register the standard cpu IO areas, and any passed in from the
103 * machine specific initialisation.
106 void __init s3c2412_map_io(struct map_desc *mach_desc, int mach_size)
108 /* move base of IO */
110 s3c2412_init_gpio2();
112 /* set our idle function */
114 s3c24xx_idle = s3c2412_idle;
116 /* register our io-tables */
118 iotable_init(s3c2412_iodesc, ARRAY_SIZE(s3c2412_iodesc));
119 iotable_init(mach_desc, mach_size);
122 void __init s3c2412_init_clocks(int xtal)
129 /* now we've got our machine bits initialised, work out what
130 * clocks we've got */
132 fclk = s3c2410_get_pll(__raw_readl(S3C2410_MPLLCON), xtal*2);
134 tmp = __raw_readl(S3C2410_CLKDIVN);
136 /* work out clock scalings */
138 hclk = fclk / ((tmp & S3C2412_CLKDIVN_HDIVN_MASK) + 1);
139 hclk /= ((tmp & S3C2421_CLKDIVN_ARMDIVN) ? 2 : 1);
140 pclk = hclk / ((tmp & S3C2412_CLKDIVN_PDIVN) ? 2 : 1);
142 /* print brieft summary of clocks, etc */
144 printk("S3C2412: core %ld.%03ld MHz, memory %ld.%03ld MHz, peripheral %ld.%03ld MHz\n",
145 print_mhz(fclk), print_mhz(hclk), print_mhz(pclk));
147 /* initialise the clocks here, to allow other things like the
148 * console to use them
151 s3c24xx_setup_clocks(xtal, fclk, hclk, pclk);
152 s3c2412_baseclk_add();
155 /* need to register class before we actually register the device, and
156 * we also need to ensure that it has been initialised before any of the
157 * drivers even try to use it (even if not on an s3c2412 based system)
158 * as a driver which may support both 2410 and 2440 may try and use it.
161 struct sysdev_class s3c2412_sysclass = {
162 set_kset_name("s3c2412-core"),
165 static int __init s3c2412_core_init(void)
167 return sysdev_class_register(&s3c2412_sysclass);
170 core_initcall(s3c2412_core_init);
172 static struct sys_device s3c2412_sysdev = {
173 .cls = &s3c2412_sysclass,
176 int __init s3c2412_init(void)
178 printk("S3C2412: Initialising architecture\n");
180 return sysdev_register(&s3c2412_sysdev);