1 /* linux/arch/arm/mach-s3c2412/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/delay.h>
20 #include <linux/sysdev.h>
21 #include <linux/serial_core.h>
22 #include <linux/platform_device.h>
24 #include <asm/mach/arch.h>
25 #include <asm/mach/map.h>
26 #include <asm/mach/irq.h>
28 #include <asm/hardware.h>
29 #include <asm/proc-fns.h>
33 #include <asm/arch/reset.h>
34 #include <asm/arch/idle.h>
36 #include <asm/arch/regs-clock.h>
37 #include <asm/arch/regs-serial.h>
38 #include <asm/arch/regs-power.h>
39 #include <asm/arch/regs-gpio.h>
40 #include <asm/arch/regs-gpioj.h>
41 #include <asm/arch/regs-dsc.h>
42 #include <asm/arch/regs-spi.h>
43 #include <asm/arch/regs-s3c2412.h>
45 #include <asm/plat-s3c24xx/s3c2412.h>
46 #include <asm/plat-s3c24xx/cpu.h>
47 #include <asm/plat-s3c24xx/devs.h>
48 #include <asm/plat-s3c24xx/clock.h>
49 #include <asm/plat-s3c24xx/pm.h>
51 #ifndef CONFIG_CPU_S3C2412_ONLY
52 void __iomem *s3c24xx_va_gpio2 = S3C24XX_VA_GPIO;
54 static inline void s3c2412_init_gpio2(void)
56 s3c24xx_va_gpio2 = S3C24XX_VA_GPIO + 0x10;
59 #define s3c2412_init_gpio2() do { } while(0)
62 /* Initial IO mappings */
64 static struct map_desc s3c2412_iodesc[] __initdata = {
71 /* uart registration process */
73 void __init s3c2412_init_uarts(struct s3c2410_uartcfg *cfg, int no)
75 s3c24xx_init_uartdevs("s3c2412-uart", s3c2410_uart_resources, cfg, no);
77 /* rename devices that are s3c2412/s3c2413 specific */
78 s3c_device_sdi.name = "s3c2412-sdi";
79 s3c_device_lcd.name = "s3c2412-lcd";
80 s3c_device_nand.name = "s3c2412-nand";
82 /* spi channel related changes, s3c2412/13 specific */
83 s3c_device_spi0.name = "s3c2412-spi";
84 s3c_device_spi0.resource[0].end = S3C24XX_PA_SPI + 0x24;
85 s3c_device_spi1.name = "s3c2412-spi";
86 s3c_device_spi1.resource[0].start = S3C24XX_PA_SPI + S3C2412_SPI1;
87 s3c_device_spi1.resource[0].end = S3C24XX_PA_SPI + S3C2412_SPI1 + 0x24;
93 * use the standard idle call by ensuring the idle mode
94 * in power config, then issuing the idle co-processor
98 static void s3c2412_idle(void)
102 /* ensure our idle mode is to go to idle */
104 tmp = __raw_readl(S3C2412_PWRCFG);
105 tmp &= ~S3C2412_PWRCFG_STANDBYWFI_MASK;
106 tmp |= S3C2412_PWRCFG_STANDBYWFI_IDLE;
107 __raw_writel(tmp, S3C2412_PWRCFG);
112 static void s3c2412_hard_reset(void)
114 /* errata "Watch-dog/Software Reset Problem" specifies that
115 * this reset must be done with the SYSCLK sourced from
116 * EXTCLK instead of FOUT to avoid a glitch in the reset
119 * See the watchdog section of the S3C2412 manual for more
120 * information on this fix.
123 __raw_writel(0x00, S3C2412_CLKSRC);
124 __raw_writel(S3C2412_SWRST_RESET, S3C2412_SWRST);
131 * register the standard cpu IO areas, and any passed in from the
132 * machine specific initialisation.
135 void __init s3c2412_map_io(struct map_desc *mach_desc, int mach_size)
137 /* move base of IO */
139 s3c2412_init_gpio2();
141 /* set our idle function */
143 s3c24xx_idle = s3c2412_idle;
145 /* set custom reset hook */
147 s3c24xx_reset_hook = s3c2412_hard_reset;
149 /* register our io-tables */
151 iotable_init(s3c2412_iodesc, ARRAY_SIZE(s3c2412_iodesc));
152 iotable_init(mach_desc, mach_size);
155 void __init s3c2412_init_clocks(int xtal)
162 /* now we've got our machine bits initialised, work out what
163 * clocks we've got */
165 fclk = s3c2410_get_pll(__raw_readl(S3C2410_MPLLCON), xtal*2);
167 tmp = __raw_readl(S3C2410_CLKDIVN);
169 /* work out clock scalings */
171 hclk = fclk / ((tmp & S3C2412_CLKDIVN_HDIVN_MASK) + 1);
172 hclk /= ((tmp & S3C2421_CLKDIVN_ARMDIVN) ? 2 : 1);
173 pclk = hclk / ((tmp & S3C2412_CLKDIVN_PDIVN) ? 2 : 1);
175 /* print brieft summary of clocks, etc */
177 printk("S3C2412: core %ld.%03ld MHz, memory %ld.%03ld MHz, peripheral %ld.%03ld MHz\n",
178 print_mhz(fclk), print_mhz(hclk), print_mhz(pclk));
180 /* initialise the clocks here, to allow other things like the
181 * console to use them
184 s3c24xx_setup_clocks(xtal, fclk, hclk, pclk);
185 s3c2412_baseclk_add();
188 /* need to register class before we actually register the device, and
189 * we also need to ensure that it has been initialised before any of the
190 * drivers even try to use it (even if not on an s3c2412 based system)
191 * as a driver which may support both 2410 and 2440 may try and use it.
194 struct sysdev_class s3c2412_sysclass = {
195 set_kset_name("s3c2412-core"),
198 static int __init s3c2412_core_init(void)
200 return sysdev_class_register(&s3c2412_sysclass);
203 core_initcall(s3c2412_core_init);
205 static struct sys_device s3c2412_sysdev = {
206 .cls = &s3c2412_sysclass,
209 int __init s3c2412_init(void)
211 printk("S3C2412: Initialising architecture\n");
213 return sysdev_register(&s3c2412_sysdev);