1/* 2 * Copyright 2011 Freescale Semiconductor, Inc. 3 * Copyright 2011 Linaro Ltd. 4 * 5 * The code contained herein is licensed under the GNU General Public 6 * License. You may obtain a copy of the GNU General Public License 7 * Version 2 or later at the following locations: 8 * 9 * http://www.opensource.org/licenses/gpl-license.html 10 * http://www.gnu.org/copyleft/gpl.html 11 */ 12 13#include <linux/init.h> 14#include <linux/io.h> 15#include <linux/of.h> 16#include <linux/suspend.h> 17#include <asm/cacheflush.h> 18#include <asm/proc-fns.h> 19#include <asm/suspend.h> 20#include <asm/hardware/cache-l2x0.h> 21#include <mach/common.h> 22#include <mach/hardware.h> 23 24extern unsigned long phys_l2x0_saved_regs; 25 26static int imx6q_suspend_finish(unsigned long val) 27{ 28 cpu_do_idle(); 29 return 0; 30} 31 32static int imx6q_pm_enter(suspend_state_t state) 33{ 34 switch (state) { 35 case PM_SUSPEND_MEM: 36 imx6q_set_lpm(STOP_POWER_OFF); 37 imx_gpc_pre_suspend(); 38 imx_set_cpu_jump(0, v7_cpu_resume); 39 /* Zzz ... */ 40 cpu_suspend(0, imx6q_suspend_finish); 41 imx_smp_prepare(); 42 imx_gpc_post_resume(); 43 break; 44 default: 45 return -EINVAL; 46 } 47 48 return 0; 49} 50 51static const struct platform_suspend_ops imx6q_pm_ops = { 52 .enter = imx6q_pm_enter, 53 .valid = suspend_valid_only_mem, 54}; 55 56void __init imx6q_pm_init(void) 57{ 58 /* 59 * The l2x0 core code provides an infrastucture to save and restore 60 * l2x0 registers across suspend/resume cycle. But because imx6q 61 * retains L2 content during suspend and needs to resume L2 before 62 * MMU is enabled, it can only utilize register saving support and 63 * have to take care of restoring on its own. So we save physical 64 * address of the data structure used by l2x0 core to save registers, 65 * and later restore the necessary ones in imx6q resume entry. 66 */ 67#ifdef CONFIG_CACHE_L2X0 68 phys_l2x0_saved_regs = __pa(&l2x0_saved_regs); 69#endif 70 71 suspend_set_ops(&imx6q_pm_ops); 72} 73