mirror of https://gitee.com/openkylin/linux.git
171 lines
3.8 KiB
C
171 lines
3.8 KiB
C
/* linux/arch/arm/mach-s3c2410/s3c2410.c
|
|
*
|
|
* Copyright (c) 2003-2005 Simtec Electronics
|
|
* Ben Dooks <ben@simtec.co.uk>
|
|
*
|
|
* http://www.simtec.co.uk/products/EB2410ITX/
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/types.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/list.h>
|
|
#include <linux/timer.h>
|
|
#include <linux/init.h>
|
|
#include <linux/clk.h>
|
|
#include <linux/sysdev.h>
|
|
#include <linux/serial_core.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/io.h>
|
|
|
|
#include <asm/mach/arch.h>
|
|
#include <asm/mach/map.h>
|
|
#include <asm/mach/irq.h>
|
|
|
|
#include <mach/hardware.h>
|
|
#include <asm/irq.h>
|
|
|
|
#include <plat/cpu-freq.h>
|
|
|
|
#include <mach/regs-clock.h>
|
|
#include <plat/regs-serial.h>
|
|
|
|
#include <plat/s3c2410.h>
|
|
#include <plat/cpu.h>
|
|
#include <plat/devs.h>
|
|
#include <plat/clock.h>
|
|
#include <plat/pll.h>
|
|
|
|
/* Initial IO mappings */
|
|
|
|
static struct map_desc s3c2410_iodesc[] __initdata = {
|
|
IODESC_ENT(CLKPWR),
|
|
IODESC_ENT(TIMER),
|
|
IODESC_ENT(WATCHDOG),
|
|
};
|
|
|
|
/* our uart devices */
|
|
|
|
/* uart registration process */
|
|
|
|
void __init s3c2410_init_uarts(struct s3c2410_uartcfg *cfg, int no)
|
|
{
|
|
s3c24xx_init_uartdevs("s3c2410-uart", s3c2410_uart_resources, cfg, no);
|
|
}
|
|
|
|
/* s3c2410_map_io
|
|
*
|
|
* register the standard cpu IO areas, and any passed in from the
|
|
* machine specific initialisation.
|
|
*/
|
|
|
|
void __init s3c2410_map_io(void)
|
|
{
|
|
iotable_init(s3c2410_iodesc, ARRAY_SIZE(s3c2410_iodesc));
|
|
}
|
|
|
|
void __init_or_cpufreq s3c2410_setup_clocks(void)
|
|
{
|
|
struct clk *xtal_clk;
|
|
unsigned long tmp;
|
|
unsigned long xtal;
|
|
unsigned long fclk;
|
|
unsigned long hclk;
|
|
unsigned long pclk;
|
|
|
|
xtal_clk = clk_get(NULL, "xtal");
|
|
xtal = clk_get_rate(xtal_clk);
|
|
clk_put(xtal_clk);
|
|
|
|
/* now we've got our machine bits initialised, work out what
|
|
* clocks we've got */
|
|
|
|
fclk = s3c24xx_get_pll(__raw_readl(S3C2410_MPLLCON), xtal);
|
|
|
|
tmp = __raw_readl(S3C2410_CLKDIVN);
|
|
|
|
/* work out clock scalings */
|
|
|
|
hclk = fclk / ((tmp & S3C2410_CLKDIVN_HDIVN) ? 2 : 1);
|
|
pclk = hclk / ((tmp & S3C2410_CLKDIVN_PDIVN) ? 2 : 1);
|
|
|
|
/* print brieft summary of clocks, etc */
|
|
|
|
printk("S3C2410: core %ld.%03ld MHz, memory %ld.%03ld MHz, peripheral %ld.%03ld MHz\n",
|
|
print_mhz(fclk), print_mhz(hclk), print_mhz(pclk));
|
|
|
|
/* initialise the clocks here, to allow other things like the
|
|
* console to use them
|
|
*/
|
|
|
|
s3c24xx_setup_clocks(fclk, hclk, pclk);
|
|
}
|
|
|
|
/* fake ARMCLK for use with cpufreq, etc. */
|
|
|
|
static struct clk s3c2410_armclk = {
|
|
.name = "armclk",
|
|
.parent = &clk_f,
|
|
.id = -1,
|
|
};
|
|
|
|
void __init s3c2410_init_clocks(int xtal)
|
|
{
|
|
s3c24xx_register_baseclocks(xtal);
|
|
s3c2410_setup_clocks();
|
|
s3c2410_baseclk_add();
|
|
s3c24xx_register_clock(&s3c2410_armclk);
|
|
}
|
|
|
|
struct sysdev_class s3c2410_sysclass = {
|
|
.name = "s3c2410-core",
|
|
};
|
|
|
|
/* Note, we would have liked to name this s3c2410-core, but we cannot
|
|
* register two sysdev_class with the same name.
|
|
*/
|
|
struct sysdev_class s3c2410a_sysclass = {
|
|
.name = "s3c2410a-core",
|
|
};
|
|
|
|
static struct sys_device s3c2410_sysdev = {
|
|
.cls = &s3c2410_sysclass,
|
|
};
|
|
|
|
/* need to register class before we actually register the device, and
|
|
* we also need to ensure that it has been initialised before any of the
|
|
* drivers even try to use it (even if not on an s3c2410 based system)
|
|
* as a driver which may support both 2410 and 2440 may try and use it.
|
|
*/
|
|
|
|
static int __init s3c2410_core_init(void)
|
|
{
|
|
return sysdev_class_register(&s3c2410_sysclass);
|
|
}
|
|
|
|
core_initcall(s3c2410_core_init);
|
|
|
|
static int __init s3c2410a_core_init(void)
|
|
{
|
|
return sysdev_class_register(&s3c2410a_sysclass);
|
|
}
|
|
|
|
core_initcall(s3c2410a_core_init);
|
|
|
|
int __init s3c2410_init(void)
|
|
{
|
|
printk("S3C2410: Initialising architecture\n");
|
|
|
|
return sysdev_register(&s3c2410_sysdev);
|
|
}
|
|
|
|
int __init s3c2410a_init(void)
|
|
{
|
|
s3c2410_sysdev.cls = &s3c2410a_sysclass;
|
|
return s3c2410_init();
|
|
}
|