| Ben Dooks | 0033a2f | 2006-09-19 09:51:32 +0100 | [diff] [blame^] | 1 | /* linux/arch/arm/mach-s3c2410/s3c2410-pm.c |
| 2 | * |
| 3 | * Copyright (c) 2006 Simtec Electronics |
| 4 | * Ben Dooks <ben@simtec.co.uk> |
| 5 | * |
| 6 | * S3C2410 (and compatible) Power Manager (Suspend-To-RAM) support |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; either version 2 of the License, or |
| 11 | * (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program; if not, write to the Free Software |
| 20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 21 | */ |
| 22 | |
| 23 | #include <linux/init.h> |
| 24 | #include <linux/suspend.h> |
| 25 | #include <linux/errno.h> |
| 26 | #include <linux/time.h> |
| 27 | #include <linux/sysdev.h> |
| 28 | |
| 29 | #include <asm/hardware.h> |
| 30 | #include <asm/io.h> |
| 31 | |
| 32 | #include <asm/arch/regs-gpio.h> |
| 33 | |
| 34 | #include "cpu.h" |
| 35 | #include "pm.h" |
| 36 | |
| 37 | #ifdef CONFIG_S3C2410_PM_DEBUG |
| 38 | extern void pm_dbg(const char *fmt, ...); |
| 39 | #define DBG(fmt...) pm_dbg(fmt) |
| 40 | #else |
| 41 | #define DBG(fmt...) printk(KERN_DEBUG fmt) |
| 42 | #endif |
| 43 | |
| 44 | static void s3c2410_pm_prepare(void) |
| 45 | { |
| 46 | /* ensure at least GSTATUS3 has the resume address */ |
| 47 | |
| 48 | __raw_writel(virt_to_phys(s3c2410_cpu_resume), S3C2410_GSTATUS3); |
| 49 | |
| 50 | DBG("GSTATUS3 0x%08x\n", __raw_readl(S3C2410_GSTATUS3)); |
| 51 | DBG("GSTATUS4 0x%08x\n", __raw_readl(S3C2410_GSTATUS4)); |
| 52 | } |
| 53 | |
| 54 | int s3c2410_pm_resume(struct sys_device *dev) |
| 55 | { |
| 56 | unsigned long tmp; |
| 57 | |
| 58 | /* unset the return-from-sleep flag, to ensure reset */ |
| 59 | |
| 60 | tmp = __raw_readl(S3C2410_GSTATUS2); |
| 61 | tmp &= S3C2410_GSTATUS2_OFFRESET; |
| 62 | __raw_writel(tmp, S3C2410_GSTATUS2); |
| 63 | |
| 64 | return 0; |
| 65 | } |
| 66 | |
| 67 | static int s3c2410_pm_add(struct sys_device *dev) |
| 68 | { |
| 69 | pm_cpu_prep = s3c2410_pm_prepare; |
| 70 | pm_cpu_sleep = s3c2410_cpu_suspend; |
| 71 | |
| 72 | return 0; |
| 73 | } |
| 74 | |
| 75 | static struct sysdev_driver s3c2410_pm_driver = { |
| 76 | .add = s3c2410_pm_add, |
| 77 | .resume = s3c2410_pm_resume, |
| 78 | }; |
| 79 | |
| 80 | /* register ourselves */ |
| 81 | |
| 82 | static int __init s3c2410_pm_drvinit(void) |
| 83 | { |
| 84 | return sysdev_driver_register(&s3c2410_sysclass, &s3c2410_pm_driver); |
| 85 | } |
| 86 | |
| 87 | arch_initcall(s3c2410_pm_drvinit); |
| 88 | |
| 89 | static struct sysdev_driver s3c2440_pm_driver = { |
| 90 | .add = s3c2410_pm_add, |
| 91 | .resume = s3c2410_pm_resume, |
| 92 | }; |
| 93 | |
| 94 | static int __init s3c2440_pm_drvinit(void) |
| 95 | { |
| 96 | return sysdev_driver_register(&s3c2440_sysclass, &s3c2440_pm_driver); |
| 97 | } |
| 98 | |
| 99 | arch_initcall(s3c2440_pm_drvinit); |
| 100 | |
| 101 | static struct sysdev_driver s3c2442_pm_driver = { |
| 102 | .add = s3c2410_pm_add, |
| 103 | .resume = s3c2410_pm_resume, |
| 104 | }; |
| 105 | |
| 106 | static int __init s3c2442_pm_drvinit(void) |
| 107 | { |
| 108 | return sysdev_driver_register(&s3c2442_sysclass, &s3c2442_pm_driver); |
| 109 | } |
| 110 | |
| 111 | arch_initcall(s3c2442_pm_drvinit); |