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author | Ben Dooks <ben-linux@fluff.org> | 2008-12-12 00:24:06 +0000 |
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committer | Ben Dooks <ben-linux@fluff.org> | 2009-03-08 12:23:51 +0000 |
commit | 6419711a164ba1304fa8fbb75ae9485455e04dcd (patch) | |
tree | 15fe79b0ffff33d253258b849f1b69ac4c2c3bbe /arch/arm/plat-s3c/pm.c | |
parent | a3f66351b3cc89011e8a34068c245b413ce696d6 (diff) | |
download | kernel_samsung_tuna-6419711a164ba1304fa8fbb75ae9485455e04dcd.zip kernel_samsung_tuna-6419711a164ba1304fa8fbb75ae9485455e04dcd.tar.gz kernel_samsung_tuna-6419711a164ba1304fa8fbb75ae9485455e04dcd.tar.bz2 |
[ARM] S3C: Move PM support functions to common location
Start moving the PM code by moving all the common support functions
to a common location in arch/arm/plat-s3c. With the move we rename
the functions from s3cxxx_ to s3c_ to fit the new location.
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Diffstat (limited to 'arch/arm/plat-s3c/pm.c')
-rw-r--r-- | arch/arm/plat-s3c/pm.c | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/arch/arm/plat-s3c/pm.c b/arch/arm/plat-s3c/pm.c new file mode 100644 index 0000000..122e9b9 --- /dev/null +++ b/arch/arm/plat-s3c/pm.c @@ -0,0 +1,97 @@ +/* linux/arch/arm/plat-s3c/pm.c + * + * Copyright 2008 Openmoko, Inc. + * Copyright 2004,2006,2008 Simtec Electronics + * Ben Dooks <ben@simtec.co.uk> + * http://armlinux.simtec.co.uk/ + * + * S3C common power management (suspend to ram) 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/init.h> +#include <linux/suspend.h> +#include <linux/errno.h> +#include <linux/io.h> + +#include <plat/pm.h> + +/* for external use */ + +unsigned long s3c_pm_flags; + +#ifdef CONFIG_S3C2410_PM_DEBUG +extern void printascii(const char *); + +void s3c_pm_dbg(const char *fmt, ...) +{ + va_list va; + char buff[256]; + + va_start(va, fmt); + vsprintf(buff, fmt, va); + va_end(va); + + printascii(buff); +} +#endif /* CONFIG_S3C2410_PM_DEBUG */ + + +/* helper functions to save and restore register state */ + +/** + * s3c_pm_do_save() - save a set of registers for restoration on resume. + * @ptr: Pointer to an array of registers. + * @count: Size of the ptr array. + * + * Run through the list of registers given, saving their contents in the + * array for later restoration when we wakeup. + */ +void s3c_pm_do_save(struct sleep_save *ptr, int count) +{ + for (; count > 0; count--, ptr++) { + ptr->val = __raw_readl(ptr->reg); + S3C_PMDBG("saved %p value %08lx\n", ptr->reg, ptr->val); + } +} + +/** + * s3c_pm_do_restore() - restore register values from the save list. + * @ptr: Pointer to an array of registers. + * @count: Size of the ptr array. + * + * Restore the register values saved from s3c_pm_do_save(). + * + * Note, we do not use S3C_PMDBG() in here, as the system may not have + * restore the UARTs state yet +*/ + +void s3c_pm_do_restore(struct sleep_save *ptr, int count) +{ + for (; count > 0; count--, ptr++) { + printk(KERN_DEBUG "restore %p (restore %08lx, was %08x)\n", + ptr->reg, ptr->val, __raw_readl(ptr->reg)); + + __raw_writel(ptr->val, ptr->reg); + } +} + +/** + * s3c_pm_do_restore_core() - early restore register values from save list. + * + * This is similar to s3c_pm_do_restore() except we try and minimise the + * side effects of the function in case registers that hardware might need + * to work has been restored. + * + * WARNING: Do not put any debug in here that may effect memory or use + * peripherals, as things may be changing! +*/ + +void s3c_pm_do_restore_core(struct sleep_save *ptr, int count) +{ + for (; count > 0; count--, ptr++) + __raw_writel(ptr->val, ptr->reg); +} |