// SPDX-License-Identifier: GPL-2.0 // // Copyright (C) 2013 Samsung Electronics Co., Ltd. // Tomasz Figa <t.figa@samsung.com> // Copyright (C) 2008 Openmoko, Inc. // Copyright (C) 2004-2008 Simtec Electronics // Ben Dooks <ben@simtec.co.uk> // http://armlinux.simtec.co.uk/ // // Samsung common power management helper functions. #include <linux/io.h> #include <linux/kernel.h> #include <plat/pm-common.h> /* 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 = readl_relaxed(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(const struct sleep_save *ptr, int count) { for (; count > 0; count--, ptr++) { pr_debug("restore %p (restore %08lx, was %08x)\n", ptr->reg, ptr->val, readl_relaxed(ptr->reg)); writel_relaxed(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(const struct sleep_save *ptr, int count) { for (; count > 0; count--, ptr++) writel_relaxed(ptr->val, ptr->reg); }