[deliverable/linux.git] / arch / arm / mach-imx / pm-imx5.c

/*
 *  Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
 *
 * The code contained herein is licensed under the GNU General Public
 * License. You may obtain a copy of the GNU General Public License
 * Version 2 or later at the following locations:
 *
 * http://www.opensource.org/licenses/gpl-license.html
 * http://www.gnu.org/copyleft/gpl.html
 */
#include <linux/suspend.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/err.h>
#include <linux/export.h>
#include <asm/cacheflush.h>
#include <asm/system_misc.h>
#include <asm/tlbflush.h>

#include "common.h"
#include "cpuidle.h"
#include "crm-regs-imx5.h"
#include "hardware.h"

/*
 * The WAIT_UNCLOCKED_POWER_OFF state only requires <= 500ns to exit.
 * This is also the lowest power state possible without affecting
 * non-cpu parts of the system.  For these reasons, imx5 should default
 * to always using this state for cpu idling.  The PM_SUSPEND_STANDBY also
 * uses this state and needs to take no action when registers remain confgiured
 * for this state.
 */
#define IMX5_DEFAULT_CPU_IDLE_STATE WAIT_UNCLOCKED_POWER_OFF

/*
 * set cpu low power mode before WFI instruction. This function is called
 * mx5 because it can be used for mx51, and mx53.
 */
static void mx5_cpu_lp_set(enum mxc_cpu_pwr_mode mode)
{
	u32 plat_lpc, arm_srpgcr, ccm_clpcr;
	u32 empgc0, empgc1;
	int stop_mode = 0;

	/* always allow platform to issue a deep sleep mode request */
	plat_lpc = __raw_readl(MXC_CORTEXA8_PLAT_LPC) &
	    ~(MXC_CORTEXA8_PLAT_LPC_DSM);
	ccm_clpcr = __raw_readl(MXC_CCM_CLPCR) & ~(MXC_CCM_CLPCR_LPM_MASK);
	arm_srpgcr = __raw_readl(MXC_SRPG_ARM_SRPGCR) & ~(MXC_SRPGCR_PCR);
	empgc0 = __raw_readl(MXC_SRPG_EMPGC0_SRPGCR) & ~(MXC_SRPGCR_PCR);
	empgc1 = __raw_readl(MXC_SRPG_EMPGC1_SRPGCR) & ~(MXC_SRPGCR_PCR);

	switch (mode) {
	case WAIT_CLOCKED:
		break;
	case WAIT_UNCLOCKED:
		ccm_clpcr |= 0x1 << MXC_CCM_CLPCR_LPM_OFFSET;
		break;
	case WAIT_UNCLOCKED_POWER_OFF:
	case STOP_POWER_OFF:
		plat_lpc |= MXC_CORTEXA8_PLAT_LPC_DSM
			    | MXC_CORTEXA8_PLAT_LPC_DBG_DSM;
		if (mode == WAIT_UNCLOCKED_POWER_OFF) {
			ccm_clpcr |= 0x1 << MXC_CCM_CLPCR_LPM_OFFSET;
			ccm_clpcr &= ~MXC_CCM_CLPCR_VSTBY;
			ccm_clpcr &= ~MXC_CCM_CLPCR_SBYOS;
			stop_mode = 0;
		} else {
			ccm_clpcr |= 0x2 << MXC_CCM_CLPCR_LPM_OFFSET;
			ccm_clpcr |= 0x3 << MXC_CCM_CLPCR_STBY_COUNT_OFFSET;
			ccm_clpcr |= MXC_CCM_CLPCR_VSTBY;
			ccm_clpcr |= MXC_CCM_CLPCR_SBYOS;
			stop_mode = 1;
		}
		arm_srpgcr |= MXC_SRPGCR_PCR;
		break;
	case STOP_POWER_ON:
		ccm_clpcr |= 0x2 << MXC_CCM_CLPCR_LPM_OFFSET;
		break;
	default:
		printk(KERN_WARNING "UNKNOWN cpu power mode: %d\n", mode);
		return;
	}

	__raw_writel(plat_lpc, MXC_CORTEXA8_PLAT_LPC);
	__raw_writel(ccm_clpcr, MXC_CCM_CLPCR);
	__raw_writel(arm_srpgcr, MXC_SRPG_ARM_SRPGCR);
	__raw_writel(arm_srpgcr, MXC_SRPG_NEON_SRPGCR);

	if (stop_mode) {
		empgc0 |= MXC_SRPGCR_PCR;
		empgc1 |= MXC_SRPGCR_PCR;

		__raw_writel(empgc0, MXC_SRPG_EMPGC0_SRPGCR);
		__raw_writel(empgc1, MXC_SRPG_EMPGC1_SRPGCR);
	}
}

static int mx5_suspend_enter(suspend_state_t state)
{
	switch (state) {
	case PM_SUSPEND_MEM:
		mx5_cpu_lp_set(STOP_POWER_OFF);
		break;
	case PM_SUSPEND_STANDBY:
		/* DEFAULT_IDLE_STATE already configured */
		break;
	default:
		return -EINVAL;
	}

	if (state == PM_SUSPEND_MEM) {
		local_flush_tlb_all();
		flush_cache_all();

		/*clear the EMPGC0/1 bits */
		__raw_writel(0, MXC_SRPG_EMPGC0_SRPGCR);
		__raw_writel(0, MXC_SRPG_EMPGC1_SRPGCR);
	}
	cpu_do_idle();

	/* return registers to default idle state */
	mx5_cpu_lp_set(IMX5_DEFAULT_CPU_IDLE_STATE);
	return 0;
}

static int mx5_pm_valid(suspend_state_t state)
{
	return (state > PM_SUSPEND_ON && state <= PM_SUSPEND_MAX);
}

static const struct platform_suspend_ops mx5_suspend_ops = {
	.valid = mx5_pm_valid,
	.enter = mx5_suspend_enter,
};

static inline int imx5_cpu_do_idle(void)
{
	int ret = tzic_enable_wake();

	if (likely(!ret))
		cpu_do_idle();

	return ret;
}

static void imx5_pm_idle(void)
{
	imx5_cpu_do_idle();
}

static int __init imx5_pm_common_init(void)
{
	int ret;
	struct clk *gpc_dvfs_clk = clk_get(NULL, "gpc_dvfs");

	if (IS_ERR(gpc_dvfs_clk))
		return PTR_ERR(gpc_dvfs_clk);

	ret = clk_prepare_enable(gpc_dvfs_clk);
	if (ret)
		return ret;

	arm_pm_idle = imx5_pm_idle;

	/* Set the registers to the default cpu idle state. */
	mx5_cpu_lp_set(IMX5_DEFAULT_CPU_IDLE_STATE);

	return imx5_cpuidle_init();
}

void __init imx51_pm_init(void)
{
	int ret = imx5_pm_common_init();
	if (!ret)
		suspend_set_ops(&mx5_suspend_ops);
}

void __init imx53_pm_init(void)
{
	imx5_pm_common_init();
}
Commit	Line	Data
0adf882b	1	/*
784a90c0 SH	2	* Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
784a90c0 SH	3	*
0adf882b DN	4	* The code contained herein is licensed under the GNU General Public
	5	* License. You may obtain a copy of the GNU General Public License
	6	* Version 2 or later at the following locations:
	7	*
	8	* http://www.opensource.org/licenses/gpl-license.html
	9	* http://www.gnu.org/copyleft/gpl.html
	10	*/
784a90c0 SH	11	#include <linux/suspend.h>
784a90c0 SH	12	#include <linux/clk.h>
0adf882b	13	#include <linux/io.h>
784a90c0	14	#include <linux/err.h>
ccc12b32	15	#include <linux/export.h>
784a90c0	16	#include <asm/cacheflush.h>
565fa91f	17	#include <asm/system_misc.h>
784a90c0	18	#include <asm/tlbflush.h>
e3372474 SG	19
e3372474 SG	20	#include "common.h"
e29248c9	21	#include "cpuidle.h"
784a90c0	22	#include "crm-regs-imx5.h"
50f2de61	23	#include "hardware.h"
784a90c0	24
565fa91f RL	25	/*
	26	* The WAIT_UNCLOCKED_POWER_OFF state only requires <= 500ns to exit.
	27	* This is also the lowest power state possible without affecting
	28	* non-cpu parts of the system. For these reasons, imx5 should default
	29	* to always using this state for cpu idling. The PM_SUSPEND_STANDBY also
	30	* uses this state and needs to take no action when registers remain confgiured
	31	* for this state.
	32	*/
	33	#define IMX5_DEFAULT_CPU_IDLE_STATE WAIT_UNCLOCKED_POWER_OFF
0adf882b	34
784a90c0 SH	35	/*
784a90c0 SH	36	* set cpu low power mode before WFI instruction. This function is called
7356420c	37	* mx5 because it can be used for mx51, and mx53.
784a90c0	38	*/
565fa91f	39	static void mx5_cpu_lp_set(enum mxc_cpu_pwr_mode mode)
0adf882b DN	40	{
	41	u32 plat_lpc, arm_srpgcr, ccm_clpcr;
	42	u32 empgc0, empgc1;
	43	int stop_mode = 0;
	44
	45	/* always allow platform to issue a deep sleep mode request */
	46	plat_lpc = __raw_readl(MXC_CORTEXA8_PLAT_LPC) &
	47	~(MXC_CORTEXA8_PLAT_LPC_DSM);
	48	ccm_clpcr = __raw_readl(MXC_CCM_CLPCR) & ~(MXC_CCM_CLPCR_LPM_MASK);
	49	arm_srpgcr = __raw_readl(MXC_SRPG_ARM_SRPGCR) & ~(MXC_SRPGCR_PCR);
	50	empgc0 = __raw_readl(MXC_SRPG_EMPGC0_SRPGCR) & ~(MXC_SRPGCR_PCR);
	51	empgc1 = __raw_readl(MXC_SRPG_EMPGC1_SRPGCR) & ~(MXC_SRPGCR_PCR);
	52
	53	switch (mode) {
	54	case WAIT_CLOCKED:
	55	break;
	56	case WAIT_UNCLOCKED:
	57	ccm_clpcr \|= 0x1 << MXC_CCM_CLPCR_LPM_OFFSET;
	58	break;
	59	case WAIT_UNCLOCKED_POWER_OFF:
	60	case STOP_POWER_OFF:
	61	plat_lpc \|= MXC_CORTEXA8_PLAT_LPC_DSM
	62	\| MXC_CORTEXA8_PLAT_LPC_DBG_DSM;
	63	if (mode == WAIT_UNCLOCKED_POWER_OFF) {
	64	ccm_clpcr \|= 0x1 << MXC_CCM_CLPCR_LPM_OFFSET;
	65	ccm_clpcr &= ~MXC_CCM_CLPCR_VSTBY;
	66	ccm_clpcr &= ~MXC_CCM_CLPCR_SBYOS;
	67	stop_mode = 0;
	68	} else {
	69	ccm_clpcr \|= 0x2 << MXC_CCM_CLPCR_LPM_OFFSET;
	70	ccm_clpcr \|= 0x3 << MXC_CCM_CLPCR_STBY_COUNT_OFFSET;
	71	ccm_clpcr \|= MXC_CCM_CLPCR_VSTBY;
	72	ccm_clpcr \|= MXC_CCM_CLPCR_SBYOS;
	73	stop_mode = 1;
	74	}
	75	arm_srpgcr \|= MXC_SRPGCR_PCR;
0adf882b DN	76	break;
	77	case STOP_POWER_ON:
	78	ccm_clpcr \|= 0x2 << MXC_CCM_CLPCR_LPM_OFFSET;
	79	break;
	80	default:
	81	printk(KERN_WARNING "UNKNOWN cpu power mode: %d\n", mode);
	82	return;
	83	}
	84
	85	__raw_writel(plat_lpc, MXC_CORTEXA8_PLAT_LPC);
	86	__raw_writel(ccm_clpcr, MXC_CCM_CLPCR);
	87	__raw_writel(arm_srpgcr, MXC_SRPG_ARM_SRPGCR);
7356420c	88	__raw_writel(arm_srpgcr, MXC_SRPG_NEON_SRPGCR);
0adf882b DN	89
	90	if (stop_mode) {
	91	empgc0 \|= MXC_SRPGCR_PCR;
	92	empgc1 \|= MXC_SRPGCR_PCR;
	93
	94	__raw_writel(empgc0, MXC_SRPG_EMPGC0_SRPGCR);
	95	__raw_writel(empgc1, MXC_SRPG_EMPGC1_SRPGCR);
	96	}
	97	}
784a90c0	98
784a90c0 SH	99	static int mx5_suspend_enter(suspend_state_t state)
	100	{
	101	switch (state) {
	102	case PM_SUSPEND_MEM:
	103	mx5_cpu_lp_set(STOP_POWER_OFF);
	104	break;
	105	case PM_SUSPEND_STANDBY:
565fa91f	106	/* DEFAULT_IDLE_STATE already configured */
784a90c0 SH	107	break;
	108	default:
	109	return -EINVAL;
	110	}
	111
	112	if (state == PM_SUSPEND_MEM) {
	113	local_flush_tlb_all();
	114	flush_cache_all();
	115
	116	/clear the EMPGC0/1 bits /
	117	__raw_writel(0, MXC_SRPG_EMPGC0_SRPGCR);
	118	__raw_writel(0, MXC_SRPG_EMPGC1_SRPGCR);
	119	}
	120	cpu_do_idle();
784a90c0	121
565fa91f RL	122	/* return registers to default idle state */
	123	mx5_cpu_lp_set(IMX5_DEFAULT_CPU_IDLE_STATE);
	124	return 0;
784a90c0 SH	125	}
	126
	127	static int mx5_pm_valid(suspend_state_t state)
	128	{
	129	return (state > PM_SUSPEND_ON && state <= PM_SUSPEND_MAX);
	130	}
	131
	132	static const struct platform_suspend_ops mx5_suspend_ops = {
	133	.valid = mx5_pm_valid,
784a90c0	134	.enter = mx5_suspend_enter,
784a90c0 SH	135	};
784a90c0 SH	136
ccc12b32	137	static inline int imx5_cpu_do_idle(void)
784a90c0	138	{
ccc12b32 RL	139	int ret = tzic_enable_wake();
	140
	141	if (likely(!ret))
565fa91f	142	cpu_do_idle();
ccc12b32 RL	143
	144	return ret;
	145	}
	146
	147	static void imx5_pm_idle(void)
	148	{
	149	imx5_cpu_do_idle();
	150	}
	151
565fa91f RL	152	static int __init imx5_pm_common_init(void)
	153	{
	154	int ret;
	155	struct clk *gpc_dvfs_clk = clk_get(NULL, "gpc_dvfs");
	156
	157	if (IS_ERR(gpc_dvfs_clk))
	158	return PTR_ERR(gpc_dvfs_clk);
784a90c0	159
565fa91f RL	160	ret = clk_prepare_enable(gpc_dvfs_clk);
	161	if (ret)
	162	return ret;
784a90c0	163
565fa91f RL	164	arm_pm_idle = imx5_pm_idle;
	165
	166	/* Set the registers to the default cpu idle state. */
	167	mx5_cpu_lp_set(IMX5_DEFAULT_CPU_IDLE_STATE);
784a90c0	168
54a4644b	169	return imx5_cpuidle_init();
784a90c0	170	}
565fa91f RL	171
	172	void __init imx51_pm_init(void)
	173	{
	174	int ret = imx5_pm_common_init();
	175	if (!ret)
	176	suspend_set_ops(&mx5_suspend_ops);
	177	}
aa96a18d RL	178
	179	void __init imx53_pm_init(void)
	180	{
	181	imx5_pm_common_init();
	182	}