Linux Kernel iMX6
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/* 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/gpio.h>
#include <linux/clk.h>
#include <linux/device.h>
#include <linux/syscore_ops.h>
#include <linux/serial_core.h>
#include <linux/platform_device.h>
#include <linux/reboot.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 <mach/gpio-samsung.h>
#include <asm/irq.h>
#include <asm/system_misc.h>
#include <plat/cpu-freq.h>
#include <mach/regs-clock.h>
#include <plat/regs-serial.h>
#include <plat/cpu.h>
#include <plat/devs.h>
#include <plat/clock.h>
#include <plat/pll.h>
#include <plat/pm.h>
#include <plat/watchdog-reset.h>
#include <plat/gpio-core.h>
#include <plat/gpio-cfg.h>
#include <plat/gpio-cfg-helpers.h>
#include "common.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)
{
s3c24xx_gpiocfg_default.set_pull = s3c24xx_gpio_setpull_1up;
s3c24xx_gpiocfg_default.get_pull = s3c24xx_gpio_getpull_1up;
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,
};
static struct clk_lookup s3c2410_clk_lookup[] = {
CLKDEV_INIT(NULL, "clk_uart_baud0", &clk_p),
CLKDEV_INIT(NULL, "clk_uart_baud1", &s3c24xx_uclk),
};
void __init s3c2410_init_clocks(int xtal)
{
s3c24xx_register_baseclocks(xtal);
s3c2410_setup_clocks();
s3c2410_baseclk_add();
s3c24xx_register_clock(&s3c2410_armclk);
clkdev_add_table(s3c2410_clk_lookup, ARRAY_SIZE(s3c2410_clk_lookup));
samsung_wdt_reset_init(S3C24XX_VA_WATCHDOG);
}
struct bus_type s3c2410_subsys = {
.name = "s3c2410-core",
.dev_name = "s3c2410-core",
};
/* Note, we would have liked to name this s3c2410-core, but we cannot
* register two subsystems with the same name.
*/
struct bus_type s3c2410a_subsys = {
.name = "s3c2410a-core",
.dev_name = "s3c2410a-core",
};
static struct device s3c2410_dev = {
.bus = &s3c2410_subsys,
};
/* need to register the subsystem 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 subsys_system_register(&s3c2410_subsys, NULL);
}
core_initcall(s3c2410_core_init);
static int __init s3c2410a_core_init(void)
{
return subsys_system_register(&s3c2410a_subsys, NULL);
}
core_initcall(s3c2410a_core_init);
int __init s3c2410_init(void)
{
printk("S3C2410: Initialising architecture\n");
#ifdef CONFIG_PM
register_syscore_ops(&s3c2410_pm_syscore_ops);
register_syscore_ops(&s3c24xx_irq_syscore_ops);
#endif
return device_register(&s3c2410_dev);
}
int __init s3c2410a_init(void)
{
s3c2410_dev.bus = &s3c2410a_subsys;
return s3c2410_init();
}
void s3c2410_restart(enum reboot_mode mode, const char *cmd)
{
if (mode == REBOOT_SOFT) {
soft_restart(0);
}
samsung_wdt_reset();
/* we'll take a jump through zero as a poor second */
soft_restart(0);
}