diff options
Diffstat (limited to 'arch/arm/plat-s3c24xx/s3c244x.c')
| -rw-r--r-- | arch/arm/plat-s3c24xx/s3c244x.c | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/arch/arm/plat-s3c24xx/s3c244x.c b/arch/arm/plat-s3c24xx/s3c244x.c new file mode 100644 index 000000000000..87aace4c8f8c --- /dev/null +++ b/arch/arm/plat-s3c24xx/s3c244x.c @@ -0,0 +1,184 @@ +/* linux/arch/arm/plat-s3c24xx/s3c244x.c + * + * Copyright (c) 2004-2006 Simtec Electronics + * Ben Dooks <ben@simtec.co.uk> + * + * Samsung S3C2440 and S3C2442 Mobile CPU support + * + * 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/serial_core.h> +#include <linux/platform_device.h> +#include <linux/sysdev.h> +#include <linux/clk.h> + +#include <asm/mach/arch.h> +#include <asm/mach/map.h> +#include <asm/mach/irq.h> + +#include <asm/hardware.h> +#include <asm/io.h> +#include <asm/irq.h> + +#include <asm/arch/regs-clock.h> +#include <asm/arch/regs-serial.h> +#include <asm/arch/regs-gpio.h> +#include <asm/arch/regs-gpioj.h> +#include <asm/arch/regs-dsc.h> + +#include <asm/plat-s3c24xx/s3c2410.h> +#include <asm/plat-s3c24xx/s3c2440.h> +#include "s3c244x.h" +#include <asm/plat-s3c24xx/clock.h> +#include <asm/plat-s3c24xx/devs.h> +#include <asm/plat-s3c24xx/cpu.h> +#include <asm/plat-s3c24xx/pm.h> + +static struct map_desc s3c244x_iodesc[] __initdata = { + IODESC_ENT(CLKPWR), + IODESC_ENT(TIMER), + IODESC_ENT(WATCHDOG), + IODESC_ENT(LCD), +}; + +/* uart initialisation */ + +void __init s3c244x_init_uarts(struct s3c2410_uartcfg *cfg, int no) +{ + s3c24xx_init_uartdevs("s3c2440-uart", s3c2410_uart_resources, cfg, no); +} + +void __init s3c244x_map_io(struct map_desc *mach_desc, int size) +{ + /* register our io-tables */ + + iotable_init(s3c244x_iodesc, ARRAY_SIZE(s3c244x_iodesc)); + iotable_init(mach_desc, size); + + /* rename any peripherals used differing from the s3c2410 */ + + s3c_device_i2c.name = "s3c2440-i2c"; + s3c_device_nand.name = "s3c2440-nand"; + s3c_device_usbgadget.name = "s3c2440-usbgadget"; +} + +void __init s3c244x_init_clocks(int xtal) +{ + unsigned long clkdiv; + unsigned long camdiv; + unsigned long hclk, fclk, pclk; + int hdiv = 1; + + /* now we've got our machine bits initialised, work out what + * clocks we've got */ + + fclk = s3c2410_get_pll(__raw_readl(S3C2410_MPLLCON), xtal) * 2; + + clkdiv = __raw_readl(S3C2410_CLKDIVN); + camdiv = __raw_readl(S3C2440_CAMDIVN); + + /* work out clock scalings */ + + switch (clkdiv & S3C2440_CLKDIVN_HDIVN_MASK) { + case S3C2440_CLKDIVN_HDIVN_1: + hdiv = 1; + break; + + case S3C2440_CLKDIVN_HDIVN_2: + hdiv = 2; + break; + + case S3C2440_CLKDIVN_HDIVN_4_8: + hdiv = (camdiv & S3C2440_CAMDIVN_HCLK4_HALF) ? 8 : 4; + break; + + case S3C2440_CLKDIVN_HDIVN_3_6: + hdiv = (camdiv & S3C2440_CAMDIVN_HCLK3_HALF) ? 6 : 3; + break; + } + + hclk = fclk / hdiv; + pclk = hclk / ((clkdiv & S3C2440_CLKDIVN_PDIVN)? 2:1); + + /* print brief summary of clocks, etc */ + + printk("S3C244X: 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, and to add new ones after the initialisation + */ + + s3c24xx_setup_clocks(xtal, fclk, hclk, pclk); + s3c2410_baseclk_add(); +} + +#ifdef CONFIG_PM + +static struct sleep_save s3c244x_sleep[] = { + SAVE_ITEM(S3C2440_DSC0), + SAVE_ITEM(S3C2440_DSC1), + SAVE_ITEM(S3C2440_GPJDAT), + SAVE_ITEM(S3C2440_GPJCON), + SAVE_ITEM(S3C2440_GPJUP) +}; + +static int s3c244x_suspend(struct sys_device *dev, pm_message_t state) +{ + s3c2410_pm_do_save(s3c244x_sleep, ARRAY_SIZE(s3c244x_sleep)); + return 0; +} + +static int s3c244x_resume(struct sys_device *dev) +{ + s3c2410_pm_do_restore(s3c244x_sleep, ARRAY_SIZE(s3c244x_sleep)); + return 0; +} + +#else +#define s3c244x_suspend NULL +#define s3c244x_resume NULL +#endif + +/* Since the S3C2442 and S3C2440 share items, put both sysclasses here */ + +struct sysdev_class s3c2440_sysclass = { + set_kset_name("s3c2440-core"), + .suspend = s3c244x_suspend, + .resume = s3c244x_resume +}; + +struct sysdev_class s3c2442_sysclass = { + set_kset_name("s3c2442-core"), + .suspend = s3c244x_suspend, + .resume = s3c244x_resume +}; + +/* 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 s3c2440 based system) + * as a driver which may support both 2410 and 2440 may try and use it. +*/ + +static int __init s3c2440_core_init(void) +{ + return sysdev_class_register(&s3c2440_sysclass); +} + +core_initcall(s3c2440_core_init); + +static int __init s3c2442_core_init(void) +{ + return sysdev_class_register(&s3c2442_sysclass); +} + +core_initcall(s3c2442_core_init); |