11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * PXA250/210 Power Management Routines 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * Original code for the SA11x0: 51da177e4SLinus Torvalds * Copyright (c) 2001 Cliff Brake <cbrake@accelent.com> 61da177e4SLinus Torvalds * 71da177e4SLinus Torvalds * Modified for the PXA250 by Nicolas Pitre: 81da177e4SLinus Torvalds * Copyright (c) 2002 Monta Vista Software, Inc. 91da177e4SLinus Torvalds * 101da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or 111da177e4SLinus Torvalds * modify it under the terms of the GNU General Public License. 121da177e4SLinus Torvalds */ 131da177e4SLinus Torvalds #include <linux/init.h> 14756c7b74SRichard Purdie #include <linux/module.h> 151da177e4SLinus Torvalds #include <linux/suspend.h> 161da177e4SLinus Torvalds #include <linux/errno.h> 171da177e4SLinus Torvalds #include <linux/time.h> 181da177e4SLinus Torvalds 191da177e4SLinus Torvalds #include <asm/hardware.h> 201da177e4SLinus Torvalds #include <asm/memory.h> 211da177e4SLinus Torvalds #include <asm/system.h> 22756c7b74SRichard Purdie #include <asm/arch/pm.h> 231da177e4SLinus Torvalds #include <asm/arch/pxa-regs.h> 241da177e4SLinus Torvalds #include <asm/arch/lubbock.h> 251da177e4SLinus Torvalds #include <asm/mach/time.h> 261da177e4SLinus Torvalds 27711be5ccSEric Miao struct pxa_cpu_pm_fns *pxa_cpu_pm_fns; 28711be5ccSEric Miao static unsigned long *sleep_save; 291da177e4SLinus Torvalds 30756c7b74SRichard Purdie int pxa_pm_enter(suspend_state_t state) 311da177e4SLinus Torvalds { 32711be5ccSEric Miao unsigned long sleep_save_checksum = 0, checksum = 0; 331da177e4SLinus Torvalds int i; 341da177e4SLinus Torvalds 351da177e4SLinus Torvalds #ifdef CONFIG_IWMMXT 361da177e4SLinus Torvalds /* force any iWMMXt context to ram **/ 37afe4b25eSLennert Buytenhek if (elf_hwcap & HWCAP_IWMMXT) 381da177e4SLinus Torvalds iwmmxt_task_disable(NULL); 391da177e4SLinus Torvalds #endif 401da177e4SLinus Torvalds 41711be5ccSEric Miao pxa_cpu_pm_fns->save(sleep_save); 421da177e4SLinus Torvalds 431da177e4SLinus Torvalds /* Clear sleep reset status */ 441da177e4SLinus Torvalds RCSR = RCSR_SMR; 451da177e4SLinus Torvalds 461da177e4SLinus Torvalds /* before sleeping, calculate and save a checksum */ 47711be5ccSEric Miao for (i = 0; i < pxa_cpu_pm_fns->save_size - 1; i++) 48711be5ccSEric Miao sleep_save_checksum += sleep_save[i]; 491da177e4SLinus Torvalds 501da177e4SLinus Torvalds /* *** go zzz *** */ 51711be5ccSEric Miao pxa_cpu_pm_fns->enter(state); 5236c5ed23SRussell King cpu_init(); 5336c5ed23SRussell King 541da177e4SLinus Torvalds /* after sleeping, validate the checksum */ 55711be5ccSEric Miao for (i = 0; i < pxa_cpu_pm_fns->save_size - 1; i++) 561da177e4SLinus Torvalds checksum += sleep_save[i]; 571da177e4SLinus Torvalds 581da177e4SLinus Torvalds /* if invalid, display message and wait for a hardware reset */ 59711be5ccSEric Miao if (checksum != sleep_save_checksum) { 601da177e4SLinus Torvalds #ifdef CONFIG_ARCH_LUBBOCK 611da177e4SLinus Torvalds LUB_HEXLED = 0xbadbadc5; 621da177e4SLinus Torvalds #endif 631da177e4SLinus Torvalds while (1) 64711be5ccSEric Miao pxa_cpu_pm_fns->enter(state); 651da177e4SLinus Torvalds } 661da177e4SLinus Torvalds 67711be5ccSEric Miao pxa_cpu_pm_fns->restore(sleep_save); 681da177e4SLinus Torvalds 69711be5ccSEric Miao pr_debug("*** made it back from resume\n"); 701da177e4SLinus Torvalds 711da177e4SLinus Torvalds return 0; 721da177e4SLinus Torvalds } 731da177e4SLinus Torvalds 74756c7b74SRichard Purdie EXPORT_SYMBOL_GPL(pxa_pm_enter); 75756c7b74SRichard Purdie 761da177e4SLinus Torvalds unsigned long sleep_phys_sp(void *sp) 771da177e4SLinus Torvalds { 781da177e4SLinus Torvalds return virt_to_phys(sp); 791da177e4SLinus Torvalds } 80711be5ccSEric Miao 81711be5ccSEric Miao static int pxa_pm_valid(suspend_state_t state) 82711be5ccSEric Miao { 83711be5ccSEric Miao if (pxa_cpu_pm_fns) 84711be5ccSEric Miao return pxa_cpu_pm_fns->valid(state); 85711be5ccSEric Miao 86711be5ccSEric Miao return -EINVAL; 87711be5ccSEric Miao } 88711be5ccSEric Miao 8926398a70SRafael J. Wysocki static struct platform_suspend_ops pxa_pm_ops = { 90711be5ccSEric Miao .valid = pxa_pm_valid, 91711be5ccSEric Miao .enter = pxa_pm_enter, 92711be5ccSEric Miao }; 93711be5ccSEric Miao 94711be5ccSEric Miao static int __init pxa_pm_init(void) 95711be5ccSEric Miao { 96711be5ccSEric Miao if (!pxa_cpu_pm_fns) { 97711be5ccSEric Miao printk(KERN_ERR "no valid pxa_cpu_pm_fns defined\n"); 98711be5ccSEric Miao return -EINVAL; 99711be5ccSEric Miao } 100711be5ccSEric Miao 101711be5ccSEric Miao sleep_save = kmalloc(pxa_cpu_pm_fns->save_size, GFP_KERNEL); 102711be5ccSEric Miao if (!sleep_save) { 103711be5ccSEric Miao printk(KERN_ERR "failed to alloc memory for pm save\n"); 104711be5ccSEric Miao return -ENOMEM; 105711be5ccSEric Miao } 106711be5ccSEric Miao 10726398a70SRafael J. Wysocki suspend_set_ops(&pxa_pm_ops); 108711be5ccSEric Miao return 0; 109711be5ccSEric Miao } 110711be5ccSEric Miao 111711be5ccSEric Miao device_initcall(pxa_pm_init); 112