diff options
Diffstat (limited to 'arch/arm/mach-s3c24xx/s3c2410.c')
| -rw-r--r-- | arch/arm/mach-s3c24xx/s3c2410.c | 206 |
1 files changed, 206 insertions, 0 deletions
diff --git a/arch/arm/mach-s3c24xx/s3c2410.c b/arch/arm/mach-s3c24xx/s3c2410.c new file mode 100644 index 000000000000..061b6bb1a557 --- /dev/null +++ b/arch/arm/mach-s3c24xx/s3c2410.c @@ -0,0 +1,206 @@ +/* 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/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> +#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> + +/* 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)); +} + +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); +#endif + register_syscore_ops(&s3c24xx_irq_syscore_ops); + + return device_register(&s3c2410_dev); +} + +int __init s3c2410a_init(void) +{ + s3c2410_dev.bus = &s3c2410a_subsys; + return s3c2410_init(); +} + +void s3c2410_restart(char mode, const char *cmd) +{ + if (mode == 's') { + soft_restart(0); + } + + arch_wdt_reset(); + + /* we'll take a jump through zero as a poor second */ + soft_restart(0); +} |