| Tomasz Figa | b278991 | 2014-03-18 07:28:10 +0900 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2013 Samsung Electronics Co., Ltd. |
| 3 | * Tomasz Figa <t.figa@samsung.com> |
| 4 | * Copyright (C) 2008 Openmoko, Inc. |
| 5 | * Copyright (C) 2004-2008 Simtec Electronics |
| 6 | * Ben Dooks <ben@simtec.co.uk> |
| 7 | * http://armlinux.simtec.co.uk/ |
| 8 | * |
| 9 | * Samsung common power management helper functions. |
| 10 | * |
| 11 | * This program is free software; you can redistribute it and/or modify |
| 12 | * it under the terms of the GNU General Public License version 2 as |
| 13 | * published by the Free Software Foundation. |
| 14 | */ |
| 15 | |
| 16 | #include <linux/io.h> |
| 17 | #include <linux/kernel.h> |
| 18 | |
| 19 | #include <plat/pm-common.h> |
| 20 | |
| 21 | /* helper functions to save and restore register state */ |
| 22 | |
| 23 | /** |
| 24 | * s3c_pm_do_save() - save a set of registers for restoration on resume. |
| 25 | * @ptr: Pointer to an array of registers. |
| 26 | * @count: Size of the ptr array. |
| 27 | * |
| 28 | * Run through the list of registers given, saving their contents in the |
| 29 | * array for later restoration when we wakeup. |
| 30 | */ |
| 31 | void s3c_pm_do_save(struct sleep_save *ptr, int count) |
| 32 | { |
| 33 | for (; count > 0; count--, ptr++) { |
| 34 | ptr->val = __raw_readl(ptr->reg); |
| 35 | S3C_PMDBG("saved %p value %08lx\n", ptr->reg, ptr->val); |
| 36 | } |
| 37 | } |
| 38 | |
| 39 | /** |
| 40 | * s3c_pm_do_restore() - restore register values from the save list. |
| 41 | * @ptr: Pointer to an array of registers. |
| 42 | * @count: Size of the ptr array. |
| 43 | * |
| 44 | * Restore the register values saved from s3c_pm_do_save(). |
| 45 | * |
| 46 | * Note, we do not use S3C_PMDBG() in here, as the system may not have |
| 47 | * restore the UARTs state yet |
| 48 | */ |
| 49 | |
| 50 | void s3c_pm_do_restore(const struct sleep_save *ptr, int count) |
| 51 | { |
| 52 | for (; count > 0; count--, ptr++) { |
| 53 | pr_debug("restore %p (restore %08lx, was %08x)\n", |
| 54 | ptr->reg, ptr->val, __raw_readl(ptr->reg)); |
| 55 | |
| 56 | __raw_writel(ptr->val, ptr->reg); |
| 57 | } |
| 58 | } |
| 59 | |
| 60 | /** |
| 61 | * s3c_pm_do_restore_core() - early restore register values from save list. |
| 62 | * |
| 63 | * This is similar to s3c_pm_do_restore() except we try and minimise the |
| 64 | * side effects of the function in case registers that hardware might need |
| 65 | * to work has been restored. |
| 66 | * |
| 67 | * WARNING: Do not put any debug in here that may effect memory or use |
| 68 | * peripherals, as things may be changing! |
| 69 | */ |
| 70 | |
| 71 | void s3c_pm_do_restore_core(const struct sleep_save *ptr, int count) |
| 72 | { |
| 73 | for (; count > 0; count--, ptr++) |
| 74 | __raw_writel(ptr->val, ptr->reg); |
| 75 | } |