diff options
Diffstat (limited to 'arch/arm/mach-s3c24xx/s3c2412.c')
| -rw-r--r-- | arch/arm/mach-s3c24xx/s3c2412.c | 251 |
1 files changed, 251 insertions, 0 deletions
diff --git a/arch/arm/mach-s3c24xx/s3c2412.c b/arch/arm/mach-s3c24xx/s3c2412.c new file mode 100644 index 00000000000..c6eac987109 --- /dev/null +++ b/arch/arm/mach-s3c24xx/s3c2412.c @@ -0,0 +1,251 @@ +/* linux/arch/arm/mach-s3c2412/s3c2412.c + * + * Copyright (c) 2006 Simtec Electronics + * Ben Dooks <ben@simtec.co.uk> + * + * http://armlinux.simtec.co.uk/. + * + * 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/delay.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/proc-fns.h> +#include <asm/irq.h> + +#include <plat/cpu-freq.h> + +#include <mach/regs-clock.h> +#include <plat/regs-serial.h> +#include <mach/regs-power.h> +#include <mach/regs-gpio.h> +#include <mach/regs-gpioj.h> +#include <mach/regs-dsc.h> +#include <plat/regs-spi.h> +#include <mach/regs-s3c2412.h> + +#include <plat/s3c2412.h> +#include <plat/cpu.h> +#include <plat/devs.h> +#include <plat/clock.h> +#include <plat/pm.h> +#include <plat/pll.h> +#include <plat/nand-core.h> + +#ifndef CONFIG_CPU_S3C2412_ONLY +void __iomem *s3c24xx_va_gpio2 = S3C24XX_VA_GPIO; + +static inline void s3c2412_init_gpio2(void) +{ + s3c24xx_va_gpio2 = S3C24XX_VA_GPIO + 0x10; +} +#else +#define s3c2412_init_gpio2() do { } while(0) +#endif + +/* Initial IO mappings */ + +static struct map_desc s3c2412_iodesc[] __initdata = { + IODESC_ENT(CLKPWR), + IODESC_ENT(TIMER), + IODESC_ENT(WATCHDOG), + { + .virtual = (unsigned long)S3C2412_VA_SSMC, + .pfn = __phys_to_pfn(S3C2412_PA_SSMC), + .length = SZ_1M, + .type = MT_DEVICE, + }, + { + .virtual = (unsigned long)S3C2412_VA_EBI, + .pfn = __phys_to_pfn(S3C2412_PA_EBI), + .length = SZ_1M, + .type = MT_DEVICE, + }, +}; + +/* uart registration process */ + +void __init s3c2412_init_uarts(struct s3c2410_uartcfg *cfg, int no) +{ + s3c24xx_init_uartdevs("s3c2412-uart", s3c2410_uart_resources, cfg, no); + + /* rename devices that are s3c2412/s3c2413 specific */ + s3c_device_sdi.name = "s3c2412-sdi"; + s3c_device_lcd.name = "s3c2412-lcd"; + s3c_nand_setname("s3c2412-nand"); + + /* alter IRQ of SDI controller */ + + s3c_device_sdi.resource[1].start = IRQ_S3C2412_SDI; + s3c_device_sdi.resource[1].end = IRQ_S3C2412_SDI; + + /* spi channel related changes, s3c2412/13 specific */ + s3c_device_spi0.name = "s3c2412-spi"; + s3c_device_spi0.resource[0].end = S3C24XX_PA_SPI + 0x24; + s3c_device_spi1.name = "s3c2412-spi"; + s3c_device_spi1.resource[0].start = S3C24XX_PA_SPI + S3C2412_SPI1; + s3c_device_spi1.resource[0].end = S3C24XX_PA_SPI + S3C2412_SPI1 + 0x24; + +} + +/* s3c2412_idle + * + * use the standard idle call by ensuring the idle mode + * in power config, then issuing the idle co-processor + * instruction +*/ + +static void s3c2412_idle(void) +{ + unsigned long tmp; + + /* ensure our idle mode is to go to idle */ + + tmp = __raw_readl(S3C2412_PWRCFG); + tmp &= ~S3C2412_PWRCFG_STANDBYWFI_MASK; + tmp |= S3C2412_PWRCFG_STANDBYWFI_IDLE; + __raw_writel(tmp, S3C2412_PWRCFG); + + cpu_do_idle(); +} + +void s3c2412_restart(char mode, const char *cmd) +{ + if (mode == 's') + soft_restart(0); + + /* errata "Watch-dog/Software Reset Problem" specifies that + * this reset must be done with the SYSCLK sourced from + * EXTCLK instead of FOUT to avoid a glitch in the reset + * mechanism. + * + * See the watchdog section of the S3C2412 manual for more + * information on this fix. + */ + + __raw_writel(0x00, S3C2412_CLKSRC); + __raw_writel(S3C2412_SWRST_RESET, S3C2412_SWRST); + + mdelay(1); +} + +/* s3c2412_map_io + * + * register the standard cpu IO areas, and any passed in from the + * machine specific initialisation. +*/ + +void __init s3c2412_map_io(void) +{ + /* move base of IO */ + + s3c2412_init_gpio2(); + + /* set our idle function */ + + arm_pm_idle = s3c2412_idle; + + /* register our io-tables */ + + iotable_init(s3c2412_iodesc, ARRAY_SIZE(s3c2412_iodesc)); +} + +void __init_or_cpufreq s3c2412_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 * 2); + + clk_mpll.rate = fclk; + + tmp = __raw_readl(S3C2410_CLKDIVN); + + /* work out clock scalings */ + + hclk = fclk / ((tmp & S3C2412_CLKDIVN_HDIVN_MASK) + 1); + hclk /= ((tmp & S3C2412_CLKDIVN_ARMDIVN) ? 2 : 1); + pclk = hclk / ((tmp & S3C2412_CLKDIVN_PDIVN) ? 2 : 1); + + /* print brieft summary of clocks, etc */ + + printk("S3C2412: core %ld.%03ld MHz, memory %ld.%03ld MHz, peripheral %ld.%03ld MHz\n", + print_mhz(fclk), print_mhz(hclk), print_mhz(pclk)); + + s3c24xx_setup_clocks(fclk, hclk, pclk); +} + +void __init s3c2412_init_clocks(int xtal) +{ + /* initialise the clocks here, to allow other things like the + * console to use them + */ + + s3c24xx_register_baseclocks(xtal); + s3c2412_setup_clocks(); + s3c2412_baseclk_add(); +} + +/* 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 s3c2412 based system) + * as a driver which may support both 2410 and 2440 may try and use it. +*/ + +struct bus_type s3c2412_subsys = { + .name = "s3c2412-core", + .dev_name = "s3c2412-core", +}; + +static int __init s3c2412_core_init(void) +{ + return subsys_system_register(&s3c2412_subsys, NULL); +} + +core_initcall(s3c2412_core_init); + +static struct device s3c2412_dev = { + .bus = &s3c2412_subsys, +}; + +int __init s3c2412_init(void) +{ + printk("S3C2412: Initialising architecture\n"); + +#ifdef CONFIG_PM + register_syscore_ops(&s3c2412_pm_syscore_ops); +#endif + register_syscore_ops(&s3c24xx_irq_syscore_ops); + + return device_register(&s3c2412_dev); +} |