/* linux/arch/arm/mach-s3c2410/pm.c * * Copyright (c) 2004 Simtec Electronics *	Ben Dooks <ben@simtec.co.uk> * * S3C2410 Power Manager (Suspend-To-RAM) support * * See Documentation/arm/Samsung-S3C24XX/Suspend.txt for more information * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA * * Parts based on arch/arm/mach-pxa/pm.c * * Thanks to Dimitry Andric for debugging*/#include <linux/config.h>#include <linux/init.h>#include <linux/suspend.h>#include <linux/errno.h>#include <linux/time.h>#include <linux/interrupt.h>#include <linux/crc32.h>#include <linux/ioport.h>#include <linux/delay.h>#include <asm/hardware.h>#include <asm/io.h>#include <asm/arch/regs-serial.h>#include <asm/arch/regs-clock.h>#include <asm/arch/regs-gpio.h>#include <asm/arch/regs-mem.h>#include <asm/arch/regs-irq.h>#include <asm/mach/time.h>#include "pm.h"/* for external use */unsigned long s3c_pm_flags;/* cache functions from arch/arm/mm/proc-arm920.S */extern void arm920_flush_kern_cache_all(void);#define PFX "s3c24xx-pm: "static struct sleep_save core_save[] = {	SAVE_ITEM(S3C2410_LOCKTIME),	SAVE_ITEM(S3C2410_CLKCON),	/* we restore the timings here, with the proviso that the board	 * brings the system up in an slower, or equal frequency setting	 * to the original system.	 *	 * if we cannot guarantee this, then things are going to go very	 * wrong here, as we modify the refresh and both pll settings.	 */	SAVE_ITEM(S3C2410_BWSCON),	SAVE_ITEM(S3C2410_BANKCON0),	SAVE_ITEM(S3C2410_BANKCON1),	SAVE_ITEM(S3C2410_BANKCON2),	SAVE_ITEM(S3C2410_BANKCON3),	SAVE_ITEM(S3C2410_BANKCON4),	SAVE_ITEM(S3C2410_BANKCON5),	SAVE_ITEM(S3C2410_CLKDIVN),	SAVE_ITEM(S3C2410_MPLLCON),	SAVE_ITEM(S3C2410_UPLLCON),	SAVE_ITEM(S3C2410_CLKSLOW),	SAVE_ITEM(S3C2410_REFRESH),};/* this lot should be really saved by the IRQ code */static struct sleep_save irq_save[] = {	SAVE_ITEM(S3C2410_EXTINT0),	SAVE_ITEM(S3C2410_EXTINT1),	SAVE_ITEM(S3C2410_EXTINT2),	SAVE_ITEM(S3C2410_EINFLT0),	SAVE_ITEM(S3C2410_EINFLT1),	SAVE_ITEM(S3C2410_EINFLT2),	SAVE_ITEM(S3C2410_EINFLT3),	SAVE_ITEM(S3C2410_EINTMASK),	SAVE_ITEM(S3C2410_INTMSK)};static struct sleep_save gpio_save[] = {	SAVE_ITEM(S3C2410_GPACON),	SAVE_ITEM(S3C2410_GPADAT),	SAVE_ITEM(S3C2410_GPBCON),	SAVE_ITEM(S3C2410_GPBDAT),	SAVE_ITEM(S3C2410_GPBUP),	SAVE_ITEM(S3C2410_GPCCON),	SAVE_ITEM(S3C2410_GPCDAT),	SAVE_ITEM(S3C2410_GPCUP),	SAVE_ITEM(S3C2410_GPDCON),	SAVE_ITEM(S3C2410_GPDDAT),	SAVE_ITEM(S3C2410_GPDUP),	SAVE_ITEM(S3C2410_GPECON),	SAVE_ITEM(S3C2410_GPEDAT),	SAVE_ITEM(S3C2410_GPEUP),	SAVE_ITEM(S3C2410_GPFCON),	SAVE_ITEM(S3C2410_GPFDAT),	SAVE_ITEM(S3C2410_GPFUP),	SAVE_ITEM(S3C2410_GPGCON),	SAVE_ITEM(S3C2410_GPGDAT),	SAVE_ITEM(S3C2410_GPGUP),	SAVE_ITEM(S3C2410_GPHCON),	SAVE_ITEM(S3C2410_GPHDAT),	SAVE_ITEM(S3C2410_GPHUP),	SAVE_ITEM(S3C2410_DCLKCON),};#ifdef CONFIG_S3C2410_PM_DEBUG#define SAVE_UART(va) \	SAVE_ITEM((va) + S3C2410_ULCON), \	SAVE_ITEM((va) + S3C2410_UCON), \	SAVE_ITEM((va) + S3C2410_UFCON), \	SAVE_ITEM((va) + S3C2410_UMCON), \	SAVE_ITEM((va) + S3C2410_UBRDIV)static struct sleep_save uart_save[] = {	SAVE_UART(S3C2410_VA_UART0),	SAVE_UART(S3C2410_VA_UART1),	SAVE_UART(S3C2410_VA_UART2),};/* debug * * we send the debug to printascii() to allow it to be seen if the * system never wakes up from the sleep*/extern void printascii(const char *);static void pm_dbg(const char *fmt, ...){	va_list va;	char buff[256];	va_start(va, fmt);	vsprintf(buff, fmt, va);	va_end(va);	printascii(buff);}static void s3c2410_pm_debug_init(void){	unsigned long tmp = __raw_readl(S3C2410_CLKCON);	/* re-start uart clocks */	tmp |= S3C2410_CLKCON_UART0;	tmp |= S3C2410_CLKCON_UART1;	tmp |= S3C2410_CLKCON_UART2;	__raw_writel(tmp, S3C2410_CLKCON);	udelay(10);}#define DBG(fmt...) pm_dbg(fmt)#else#define DBG(fmt...) printk(KERN_DEBUG fmt)#define s3c2410_pm_debug_init() do { } while(0)static struct sleep_save uart_save[] = {};#endif#if defined(CONFIG_S3C2410_PM_CHECK) && CONFIG_S3C2410_PM_CHECK_CHUNKSIZE != 0/* suspend checking code... * * this next area does a set of crc checks over all the installed * memory, so the system can verify if the resume was ok. * * CONFIG_S3C2410_PM_CHECK_CHUNKSIZE defines the block-size for the CRC, * increasing it will mean that the area corrupted will be less easy to spot, * and reducing the size will cause the CRC save area to grow*/#define CHECK_CHUNKSIZE (CONFIG_S3C2410_PM_CHECK_CHUNKSIZE * 1024)static u32 crc_size;	/* size needed for the crc block */static u32 *crcs;	/* allocated over suspend/resume */typedef u32 *(run_fn_t)(struct resource *ptr, u32 *arg);/* s3c2410_pm_run_res * * go thorugh the given resource list, and look for system ram*/static void s3c2410_pm_run_res(struct resource *ptr, run_fn_t fn, u32 *arg){	while (ptr != NULL) {		if (ptr->child != NULL)			s3c2410_pm_run_res(ptr->child, fn, arg);		if ((ptr->flags & IORESOURCE_MEM) &&		    strcmp(ptr->name, "System RAM") == 0) {			DBG("Found system RAM at %08lx..%08lx\n",			    ptr->start, ptr->end);			arg = (fn)(ptr, arg);		}		ptr = ptr->sibling;	}}static void s3c2410_pm_run_sysram(run_fn_t fn, u32 *arg){	s3c2410_pm_run_res(&iomem_resource, fn, arg);}static u32 *s3c2410_pm_countram(struct resource *res, u32 *val){	u32 size = (u32)(res->end - res->start)+1;	size += CHECK_CHUNKSIZE-1;	size /= CHECK_CHUNKSIZE;	DBG("Area %08lx..%08lx, %d blocks\n", res->start, res->end, size);	*val += size * sizeof(u32);	return val;}/* s3c2410_pm_prepare_check * * prepare the necessary information for creating the CRCs. This * must be done before the final save, as it will require memory * allocating, and thus touching bits of the kernel we do not * know about.*/static void s3c2410_pm_check_prepare(void){	crc_size = 0;	s3c2410_pm_run_sysram(s3c2410_pm_countram, &crc_size);	DBG("s3c2410_pm_prepare_check: %u checks needed\n", crc_size);	crcs = kmalloc(crc_size+4, GFP_KERNEL);	if (crcs == NULL)		printk(KERN_ERR "Cannot allocated CRC save area\n");}static u32 *s3c2410_pm_makecheck(struct resource *res, u32 *val){	unsigned long addr, left;	for (addr = res->start; addr < res->end;	     addr += CHECK_CHUNKSIZE) {		left = res->end - addr;		if (left > CHECK_CHUNKSIZE)			left = CHECK_CHUNKSIZE;		*val = crc32_le(~0, phys_to_virt(addr), left);		val++;	}	return val;}/* s3c2410_pm_check_store * * compute the CRC values for the memory blocks before the final * sleep.*/static void s3c2410_pm_check_store(void){	if (crcs != NULL)		s3c2410_pm_run_sysram(s3c2410_pm_makecheck, crcs);}/* in_region * * return TRUE if the area defined by ptr..ptr+size contatins the * what..what+whatsz*/static inline int in_region(void *ptr, int size, void *what, size_t whatsz){	if ((what+whatsz) < ptr)		return 0;	if (what > (ptr+size))		return 0;	return 1;}static u32 *s3c2410_pm_runcheck(struct resource *res, u32 *val){	void *save_at = phys_to_virt(s3c2410_sleep_save_phys);	unsigned long addr;	unsigned long left;	void *ptr;	u32 calc;	for (addr = res->start; addr < res->end;	     addr += CHECK_CHUNKSIZE) {		left = res->end - addr;		if (left > CHECK_CHUNKSIZE)			left = CHECK_CHUNKSIZE;