[deliverable/linux.git] / arch / arm / mach-omap2 / pm24xx.c

/*
 * OMAP2 Power Management Routines
 *
 * Copyright (C) 2005 Texas Instruments, Inc.
 * Copyright (C) 2006-2008 Nokia Corporation
 *
 * Written by:
 * Richard Woodruff <r-woodruff2@ti.com>
 * Tony Lindgren
 * Juha Yrjola
 * Amit Kucheria <amit.kucheria@nokia.com>
 * Igor Stoppa <igor.stoppa@nokia.com>
 *
 * Based on pm.c for omap1
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/suspend.h>
#include <linux/sched.h>
#include <linux/proc_fs.h>
#include <linux/interrupt.h>
#include <linux/sysfs.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/time.h>
#include <linux/gpio.h>

#include <asm/mach/time.h>
#include <asm/mach/irq.h>
#include <asm/mach-types.h>

#include <mach/irqs.h>
#include <plat/clock.h>
#include <plat/sram.h>
#include <plat/dma.h>
#include <plat/board.h>

#include "common.h"
#include "prm2xxx_3xxx.h"
#include "prm-regbits-24xx.h"
#include "cm2xxx_3xxx.h"
#include "cm-regbits-24xx.h"
#include "sdrc.h"
#include "pm.h"
#include "control.h"

#include "powerdomain.h"
#include "clockdomain.h"

#ifdef CONFIG_SUSPEND
static suspend_state_t suspend_state = PM_SUSPEND_ON;
static inline bool is_suspending(void)
{
	return (suspend_state != PM_SUSPEND_ON);
}
#else
static inline bool is_suspending(void)
{
	return false;
}
#endif

static void (*omap2_sram_idle)(void);
static void (*omap2_sram_suspend)(u32 dllctrl, void __iomem *sdrc_dlla_ctrl,
				  void __iomem *sdrc_power);

static struct powerdomain *mpu_pwrdm, *core_pwrdm;
static struct clockdomain *dsp_clkdm, *mpu_clkdm, *wkup_clkdm, *gfx_clkdm;

static struct clk *osc_ck, *emul_ck;

static int omap2_fclks_active(void)
{
	u32 f1, f2;

	f1 = omap2_cm_read_mod_reg(CORE_MOD, CM_FCLKEN1);
	f2 = omap2_cm_read_mod_reg(CORE_MOD, OMAP24XX_CM_FCLKEN2);

	return (f1 | f2) ? 1 : 0;
}

static void omap2_enter_full_retention(void)
{
	u32 l;

	/* There is 1 reference hold for all children of the oscillator
	 * clock, the following will remove it. If no one else uses the
	 * oscillator itself it will be disabled if/when we enter retention
	 * mode.
	 */
	clk_disable(osc_ck);

	/* Clear old wake-up events */
	/* REVISIT: These write to reserved bits? */
	omap2_prm_write_mod_reg(0xffffffff, CORE_MOD, PM_WKST1);
	omap2_prm_write_mod_reg(0xffffffff, CORE_MOD, OMAP24XX_PM_WKST2);
	omap2_prm_write_mod_reg(0xffffffff, WKUP_MOD, PM_WKST);

	/*
	 * Set MPU powerdomain's next power state to RETENTION;
	 * preserve logic state during retention
	 */
	pwrdm_set_logic_retst(mpu_pwrdm, PWRDM_POWER_RET);
	pwrdm_set_next_pwrst(mpu_pwrdm, PWRDM_POWER_RET);

	/* Workaround to kill USB */
	l = omap_ctrl_readl(OMAP2_CONTROL_DEVCONF0) | OMAP24XX_USBSTANDBYCTRL;
	omap_ctrl_writel(l, OMAP2_CONTROL_DEVCONF0);

	omap2_gpio_prepare_for_idle(0);

	/* One last check for pending IRQs to avoid extra latency due
	 * to sleeping unnecessarily. */
	if (omap_irq_pending())
		goto no_sleep;

	/* Jump to SRAM suspend code */
	omap2_sram_suspend(sdrc_read_reg(SDRC_DLLA_CTRL),
			   OMAP_SDRC_REGADDR(SDRC_DLLA_CTRL),
			   OMAP_SDRC_REGADDR(SDRC_POWER));

no_sleep:
	omap2_gpio_resume_after_idle();

	clk_enable(osc_ck);

	/* clear CORE wake-up events */
	omap2_prm_write_mod_reg(0xffffffff, CORE_MOD, PM_WKST1);
	omap2_prm_write_mod_reg(0xffffffff, CORE_MOD, OMAP24XX_PM_WKST2);

	/* wakeup domain events - bit 1: GPT1, bit5 GPIO */
	omap2_prm_clear_mod_reg_bits(0x4 | 0x1, WKUP_MOD, PM_WKST);

	/* MPU domain wake events */
	l = omap2_prm_read_mod_reg(OCP_MOD, OMAP2_PRCM_IRQSTATUS_MPU_OFFSET);
	if (l & 0x01)
		omap2_prm_write_mod_reg(0x01, OCP_MOD,
				  OMAP2_PRCM_IRQSTATUS_MPU_OFFSET);
	if (l & 0x20)
		omap2_prm_write_mod_reg(0x20, OCP_MOD,
				  OMAP2_PRCM_IRQSTATUS_MPU_OFFSET);

	/* Mask future PRCM-to-MPU interrupts */
	omap2_prm_write_mod_reg(0x0, OCP_MOD, OMAP2_PRCM_IRQSTATUS_MPU_OFFSET);
}

static int omap2_i2c_active(void)
{
	u32 l;

	l = omap2_cm_read_mod_reg(CORE_MOD, CM_FCLKEN1);
	return l & (OMAP2420_EN_I2C2_MASK | OMAP2420_EN_I2C1_MASK);
}

static int sti_console_enabled;

static int omap2_allow_mpu_retention(void)
{
	u32 l;

	/* Check for MMC, UART2, UART1, McSPI2, McSPI1 and DSS1. */
	l = omap2_cm_read_mod_reg(CORE_MOD, CM_FCLKEN1);
	if (l & (OMAP2420_EN_MMC_MASK | OMAP24XX_EN_UART2_MASK |
		 OMAP24XX_EN_UART1_MASK | OMAP24XX_EN_MCSPI2_MASK |
		 OMAP24XX_EN_MCSPI1_MASK | OMAP24XX_EN_DSS1_MASK))
		return 0;
	/* Check for UART3. */
	l = omap2_cm_read_mod_reg(CORE_MOD, OMAP24XX_CM_FCLKEN2);
	if (l & OMAP24XX_EN_UART3_MASK)
		return 0;
	if (sti_console_enabled)
		return 0;

	return 1;
}

static void omap2_enter_mpu_retention(void)
{
	int only_idle = 0;

	/* Putting MPU into the WFI state while a transfer is active
	 * seems to cause the I2C block to timeout. Why? Good question. */
	if (omap2_i2c_active())
		return;

	/* The peripherals seem not to be able to wake up the MPU when
	 * it is in retention mode. */
	if (omap2_allow_mpu_retention()) {
		/* REVISIT: These write to reserved bits? */
		omap2_prm_write_mod_reg(0xffffffff, CORE_MOD, PM_WKST1);
		omap2_prm_write_mod_reg(0xffffffff, CORE_MOD, OMAP24XX_PM_WKST2);
		omap2_prm_write_mod_reg(0xffffffff, WKUP_MOD, PM_WKST);

		/* Try to enter MPU retention */
		omap2_prm_write_mod_reg((0x01 << OMAP_POWERSTATE_SHIFT) |
				  OMAP_LOGICRETSTATE_MASK,
				  MPU_MOD, OMAP2_PM_PWSTCTRL);
	} else {
		/* Block MPU retention */

		omap2_prm_write_mod_reg(OMAP_LOGICRETSTATE_MASK, MPU_MOD,
						 OMAP2_PM_PWSTCTRL);
		only_idle = 1;
	}

	omap2_sram_idle();
}

static int omap2_can_sleep(void)
{
	if (omap2_fclks_active())
		return 0;
	if (osc_ck->usecount > 1)
		return 0;
	if (omap_dma_running())
		return 0;

	return 1;
}

static void omap2_pm_idle(void)
{
	local_irq_disable();
	local_fiq_disable();

	if (!omap2_can_sleep()) {
		if (omap_irq_pending())
			goto out;
		omap2_enter_mpu_retention();
		goto out;
	}

	if (omap_irq_pending())
		goto out;

	omap2_enter_full_retention();

out:
	local_fiq_enable();
	local_irq_enable();
}

#ifdef CONFIG_SUSPEND
static int omap2_pm_begin(suspend_state_t state)
{
	disable_hlt();
	suspend_state = state;
	return 0;
}

static int omap2_pm_suspend(void)
{
	u32 wken_wkup, mir1;

	wken_wkup = omap2_prm_read_mod_reg(WKUP_MOD, PM_WKEN);
	wken_wkup &= ~OMAP24XX_EN_GPT1_MASK;
	omap2_prm_write_mod_reg(wken_wkup, WKUP_MOD, PM_WKEN);

	/* Mask GPT1 */
	mir1 = omap_readl(0x480fe0a4);
	omap_writel(1 << 5, 0x480fe0ac);

	omap2_enter_full_retention();

	omap_writel(mir1, 0x480fe0a4);
	omap2_prm_write_mod_reg(wken_wkup, WKUP_MOD, PM_WKEN);

	return 0;
}

static int omap2_pm_enter(suspend_state_t state)
{
	int ret = 0;

	switch (state) {
	case PM_SUSPEND_STANDBY:
	case PM_SUSPEND_MEM:
		ret = omap2_pm_suspend();
		break;
	default:
		ret = -EINVAL;
	}

	return ret;
}

static void omap2_pm_end(void)
{
	suspend_state = PM_SUSPEND_ON;
	enable_hlt();
}

static const struct platform_suspend_ops omap_pm_ops = {
	.begin		= omap2_pm_begin,
	.enter		= omap2_pm_enter,
	.end		= omap2_pm_end,
	.valid		= suspend_valid_only_mem,
};
#else
static const struct platform_suspend_ops __initdata omap_pm_ops;
#endif /* CONFIG_SUSPEND */

/* XXX This function should be shareable between OMAP2xxx and OMAP3 */
static int __init clkdms_setup(struct clockdomain *clkdm, void *unused)
{
	if (clkdm->flags & CLKDM_CAN_ENABLE_AUTO)
		clkdm_allow_idle(clkdm);
	else if (clkdm->flags & CLKDM_CAN_FORCE_SLEEP &&
		 atomic_read(&clkdm->usecount) == 0)
		clkdm_sleep(clkdm);
	return 0;
}

static void __init prcm_setup_regs(void)
{
	int i, num_mem_banks;
	struct powerdomain *pwrdm;

	/*
	 * Enable autoidle
	 * XXX This should be handled by hwmod code or PRCM init code
	 */
	omap2_prm_write_mod_reg(OMAP24XX_AUTOIDLE_MASK, OCP_MOD,
			  OMAP2_PRCM_SYSCONFIG_OFFSET);

	/*
	 * Set CORE powerdomain memory banks to retain their contents
	 * during RETENTION
	 */
	num_mem_banks = pwrdm_get_mem_bank_count(core_pwrdm);
	for (i = 0; i < num_mem_banks; i++)
		pwrdm_set_mem_retst(core_pwrdm, i, PWRDM_POWER_RET);

	/* Set CORE powerdomain's next power state to RETENTION */
	pwrdm_set_next_pwrst(core_pwrdm, PWRDM_POWER_RET);

	/*
	 * Set MPU powerdomain's next power state to RETENTION;
	 * preserve logic state during retention
	 */
	pwrdm_set_logic_retst(mpu_pwrdm, PWRDM_POWER_RET);
	pwrdm_set_next_pwrst(mpu_pwrdm, PWRDM_POWER_RET);

	/* Force-power down DSP, GFX powerdomains */

	pwrdm = clkdm_get_pwrdm(dsp_clkdm);
	pwrdm_set_next_pwrst(pwrdm, PWRDM_POWER_OFF);
	clkdm_sleep(dsp_clkdm);

	pwrdm = clkdm_get_pwrdm(gfx_clkdm);
	pwrdm_set_next_pwrst(pwrdm, PWRDM_POWER_OFF);
	clkdm_sleep(gfx_clkdm);

	/* Enable hardware-supervised idle for all clkdms */
	clkdm_for_each(clkdms_setup, NULL);
	clkdm_add_wkdep(mpu_clkdm, wkup_clkdm);

	/* REVISIT: Configure number of 32 kHz clock cycles for sys_clk
	 * stabilisation */
	omap2_prm_write_mod_reg(15 << OMAP_SETUP_TIME_SHIFT, OMAP24XX_GR_MOD,
				OMAP2_PRCM_CLKSSETUP_OFFSET);

	/* Configure automatic voltage transition */
	omap2_prm_write_mod_reg(2 << OMAP_SETUP_TIME_SHIFT, OMAP24XX_GR_MOD,
				OMAP2_PRCM_VOLTSETUP_OFFSET);
	omap2_prm_write_mod_reg(OMAP24XX_AUTO_EXTVOLT_MASK |
				(0x1 << OMAP24XX_SETOFF_LEVEL_SHIFT) |
				OMAP24XX_MEMRETCTRL_MASK |
				(0x1 << OMAP24XX_SETRET_LEVEL_SHIFT) |
				(0x0 << OMAP24XX_VOLT_LEVEL_SHIFT),
				OMAP24XX_GR_MOD, OMAP2_PRCM_VOLTCTRL_OFFSET);

	/* Enable wake-up events */
	omap2_prm_write_mod_reg(OMAP24XX_EN_GPIOS_MASK | OMAP24XX_EN_GPT1_MASK,
				WKUP_MOD, PM_WKEN);
}

static int __init omap2_pm_init(void)
{
	u32 l;

	if (!cpu_is_omap24xx())
		return -ENODEV;

	printk(KERN_INFO "Power Management for OMAP2 initializing\n");
	l = omap2_prm_read_mod_reg(OCP_MOD, OMAP2_PRCM_REVISION_OFFSET);
	printk(KERN_INFO "PRCM revision %d.%d\n", (l >> 4) & 0x0f, l & 0x0f);

	/* Look up important powerdomains */

	mpu_pwrdm = pwrdm_lookup("mpu_pwrdm");
	if (!mpu_pwrdm)
		pr_err("PM: mpu_pwrdm not found\n");

	core_pwrdm = pwrdm_lookup("core_pwrdm");
	if (!core_pwrdm)
		pr_err("PM: core_pwrdm not found\n");

	/* Look up important clockdomains */

	mpu_clkdm = clkdm_lookup("mpu_clkdm");
	if (!mpu_clkdm)
		pr_err("PM: mpu_clkdm not found\n");

	wkup_clkdm = clkdm_lookup("wkup_clkdm");
	if (!wkup_clkdm)
		pr_err("PM: wkup_clkdm not found\n");

	dsp_clkdm = clkdm_lookup("dsp_clkdm");
	if (!dsp_clkdm)
		pr_err("PM: dsp_clkdm not found\n");

	gfx_clkdm = clkdm_lookup("gfx_clkdm");
	if (!gfx_clkdm)
		pr_err("PM: gfx_clkdm not found\n");


	osc_ck = clk_get(NULL, "osc_ck");
	if (IS_ERR(osc_ck)) {
		printk(KERN_ERR "could not get osc_ck\n");
		return -ENODEV;
	}

	if (cpu_is_omap242x()) {
		emul_ck = clk_get(NULL, "emul_ck");
		if (IS_ERR(emul_ck)) {
			printk(KERN_ERR "could not get emul_ck\n");
			clk_put(osc_ck);
			return -ENODEV;
		}
	}

	prcm_setup_regs();

	/* Hack to prevent MPU retention when STI console is enabled. */
	{
		const struct omap_sti_console_config *sti;

		sti = omap_get_config(OMAP_TAG_STI_CONSOLE,
				      struct omap_sti_console_config);
		if (sti != NULL && sti->enable)
			sti_console_enabled = 1;
	}

	/*
	 * We copy the assembler sleep/wakeup routines to SRAM.
	 * These routines need to be in SRAM as that's the only
	 * memory the MPU can see when it wakes up.
	 */
	if (cpu_is_omap24xx()) {
		omap2_sram_idle = omap_sram_push(omap24xx_idle_loop_suspend,
						 omap24xx_idle_loop_suspend_sz);

		omap2_sram_suspend = omap_sram_push(omap24xx_cpu_suspend,
						    omap24xx_cpu_suspend_sz);
	}

	suspend_set_ops(&omap_pm_ops);
	pm_idle = omap2_pm_idle;

	return 0;
}

late_initcall(omap2_pm_init);
Commit	Line	Data
8bd22949 KH	1	/*
	2	* OMAP2 Power Management Routines
	3	*
	4	* Copyright (C) 2005 Texas Instruments, Inc.
	5	* Copyright (C) 2006-2008 Nokia Corporation
	6	*
	7	* Written by:
	8	* Richard Woodruff <r-woodruff2@ti.com>
	9	* Tony Lindgren
	10	* Juha Yrjola
	11	* Amit Kucheria <amit.kucheria@nokia.com>
	12	* Igor Stoppa <igor.stoppa@nokia.com>
	13	*
	14	* Based on pm.c for omap1
	15	*
	16	* This program is free software; you can redistribute it and/or modify
	17	* it under the terms of the GNU General Public License version 2 as
	18	* published by the Free Software Foundation.
	19	*/
	20
	21	#include <linux/suspend.h>
	22	#include <linux/sched.h>
	23	#include <linux/proc_fs.h>
	24	#include <linux/interrupt.h>
	25	#include <linux/sysfs.h>
	26	#include <linux/module.h>
	27	#include <linux/delay.h>
	28	#include <linux/clk.h>
	29	#include <linux/io.h>
	30	#include <linux/irq.h>
	31	#include <linux/time.h>
	32	#include <linux/gpio.h>
	33
	34	#include <asm/mach/time.h>
	35	#include <asm/mach/irq.h>
	36	#include <asm/mach-types.h>
	37
	38	#include <mach/irqs.h>
ce491cf8 TL	39	#include <plat/clock.h>
ce491cf8 TL	40	#include <plat/sram.h>
ce491cf8 TL	41	#include <plat/dma.h>
ce491cf8 TL	42	#include <plat/board.h>
8bd22949	43
4e65331c	44	#include "common.h"
59fb659b	45	#include "prm2xxx_3xxx.h"
8bd22949	46	#include "prm-regbits-24xx.h"
59fb659b	47	#include "cm2xxx_3xxx.h"
8bd22949 KH	48	#include "cm-regbits-24xx.h"
	49	#include "sdrc.h"
	50	#include "pm.h"
4814ced5	51	#include "control.h"
8bd22949	52
72e06d08	53	#include "powerdomain.h"
1540f214	54	#include "clockdomain.h"
8bd22949	55
e83df17f KH	56	#ifdef CONFIG_SUSPEND
	57	static suspend_state_t suspend_state = PM_SUSPEND_ON;
	58	static inline bool is_suspending(void)
	59	{
	60	return (suspend_state != PM_SUSPEND_ON);
	61	}
	62	#else
	63	static inline bool is_suspending(void)
	64	{
	65	return false;
	66	}
	67	#endif
	68
8bd22949 KH	69	static void (*omap2_sram_idle)(void);
	70	static void (omap2_sram_suspend)(u32 dllctrl, void __iomem sdrc_dlla_ctrl,
	71	void __iomem *sdrc_power);
	72
369d5614 PW	73	static struct powerdomain mpu_pwrdm, core_pwrdm;
369d5614 PW	74	static struct clockdomain dsp_clkdm, mpu_clkdm, wkup_clkdm, gfx_clkdm;
8bd22949 KH	75
	76	static struct clk osc_ck, emul_ck;
	77
	78	static int omap2_fclks_active(void)
	79	{
	80	u32 f1, f2;
	81
c4d7e58f PW	82	f1 = omap2_cm_read_mod_reg(CORE_MOD, CM_FCLKEN1);
c4d7e58f PW	83	f2 = omap2_cm_read_mod_reg(CORE_MOD, OMAP24XX_CM_FCLKEN2);
4af4016c	84
1e056ddd	85	return (f1 \| f2) ? 1 : 0;
8bd22949 KH	86	}
8bd22949 KH	87
8bd22949 KH	88	static void omap2_enter_full_retention(void)
	89	{
	90	u32 l;
8bd22949 KH	91
	92	/* There is 1 reference hold for all children of the oscillator
	93	* clock, the following will remove it. If no one else uses the
	94	* oscillator itself it will be disabled if/when we enter retention
	95	* mode.
	96	*/
	97	clk_disable(osc_ck);
	98
	99	/* Clear old wake-up events */
	100	/* REVISIT: These write to reserved bits? */
c4d7e58f PW	101	omap2_prm_write_mod_reg(0xffffffff, CORE_MOD, PM_WKST1);
	102	omap2_prm_write_mod_reg(0xffffffff, CORE_MOD, OMAP24XX_PM_WKST2);
	103	omap2_prm_write_mod_reg(0xffffffff, WKUP_MOD, PM_WKST);
8bd22949 KH	104
	105	/*
	106	* Set MPU powerdomain's next power state to RETENTION;
	107	* preserve logic state during retention
	108	*/
	109	pwrdm_set_logic_retst(mpu_pwrdm, PWRDM_POWER_RET);
	110	pwrdm_set_next_pwrst(mpu_pwrdm, PWRDM_POWER_RET);
	111
	112	/* Workaround to kill USB */
	113	l = omap_ctrl_readl(OMAP2_CONTROL_DEVCONF0) \| OMAP24XX_USBSTANDBYCTRL;
	114	omap_ctrl_writel(l, OMAP2_CONTROL_DEVCONF0);
	115
72e06d08	116	omap2_gpio_prepare_for_idle(0);
8bd22949	117
8bd22949 KH	118	/* One last check for pending IRQs to avoid extra latency due
8bd22949 KH	119	* to sleeping unnecessarily. */
94434535	120	if (omap_irq_pending())
8bd22949 KH	121	goto no_sleep;
	122
	123	/* Jump to SRAM suspend code */
	124	omap2_sram_suspend(sdrc_read_reg(SDRC_DLLA_CTRL),
	125	OMAP_SDRC_REGADDR(SDRC_DLLA_CTRL),
	126	OMAP_SDRC_REGADDR(SDRC_POWER));
8bd22949	127
4af4016c	128	no_sleep:
43ffcd9a	129	omap2_gpio_resume_after_idle();
8bd22949 KH	130
	131	clk_enable(osc_ck);
	132
	133	/* clear CORE wake-up events */
c4d7e58f PW	134	omap2_prm_write_mod_reg(0xffffffff, CORE_MOD, PM_WKST1);
c4d7e58f PW	135	omap2_prm_write_mod_reg(0xffffffff, CORE_MOD, OMAP24XX_PM_WKST2);
8bd22949 KH	136
8bd22949 KH	137	/* wakeup domain events - bit 1: GPT1, bit5 GPIO */
c4d7e58f	138	omap2_prm_clear_mod_reg_bits(0x4 \| 0x1, WKUP_MOD, PM_WKST);
8bd22949 KH	139
8bd22949 KH	140	/* MPU domain wake events */
c4d7e58f	141	l = omap2_prm_read_mod_reg(OCP_MOD, OMAP2_PRCM_IRQSTATUS_MPU_OFFSET);
8bd22949	142	if (l & 0x01)
c4d7e58f	143	omap2_prm_write_mod_reg(0x01, OCP_MOD,
8bd22949 KH	144	OMAP2_PRCM_IRQSTATUS_MPU_OFFSET);
8bd22949 KH	145	if (l & 0x20)
c4d7e58f	146	omap2_prm_write_mod_reg(0x20, OCP_MOD,
8bd22949 KH	147	OMAP2_PRCM_IRQSTATUS_MPU_OFFSET);
	148
	149	/* Mask future PRCM-to-MPU interrupts */
c4d7e58f	150	omap2_prm_write_mod_reg(0x0, OCP_MOD, OMAP2_PRCM_IRQSTATUS_MPU_OFFSET);
8bd22949 KH	151	}
	152
	153	static int omap2_i2c_active(void)
	154	{
	155	u32 l;
	156
c4d7e58f	157	l = omap2_cm_read_mod_reg(CORE_MOD, CM_FCLKEN1);
f38ca10a	158	return l & (OMAP2420_EN_I2C2_MASK \| OMAP2420_EN_I2C1_MASK);
8bd22949 KH	159	}
	160
	161	static int sti_console_enabled;
	162
	163	static int omap2_allow_mpu_retention(void)
	164	{
	165	u32 l;
	166
	167	/* Check for MMC, UART2, UART1, McSPI2, McSPI1 and DSS1. */
c4d7e58f	168	l = omap2_cm_read_mod_reg(CORE_MOD, CM_FCLKEN1);
2fd0f75c PW	169	if (l & (OMAP2420_EN_MMC_MASK \| OMAP24XX_EN_UART2_MASK \|
	170	OMAP24XX_EN_UART1_MASK \| OMAP24XX_EN_MCSPI2_MASK \|
	171	OMAP24XX_EN_MCSPI1_MASK \| OMAP24XX_EN_DSS1_MASK))
8bd22949 KH	172	return 0;
8bd22949 KH	173	/* Check for UART3. */
c4d7e58f	174	l = omap2_cm_read_mod_reg(CORE_MOD, OMAP24XX_CM_FCLKEN2);
2fd0f75c	175	if (l & OMAP24XX_EN_UART3_MASK)
8bd22949 KH	176	return 0;
	177	if (sti_console_enabled)
	178	return 0;
	179
	180	return 1;
	181	}
	182
	183	static void omap2_enter_mpu_retention(void)
	184	{
	185	int only_idle = 0;
8bd22949 KH	186
	187	/* Putting MPU into the WFI state while a transfer is active
	188	* seems to cause the I2C block to timeout. Why? Good question. */
	189	if (omap2_i2c_active())
	190	return;
	191
	192	/* The peripherals seem not to be able to wake up the MPU when
	193	* it is in retention mode. */
	194	if (omap2_allow_mpu_retention()) {
	195	/* REVISIT: These write to reserved bits? */
c4d7e58f PW	196	omap2_prm_write_mod_reg(0xffffffff, CORE_MOD, PM_WKST1);
	197	omap2_prm_write_mod_reg(0xffffffff, CORE_MOD, OMAP24XX_PM_WKST2);
	198	omap2_prm_write_mod_reg(0xffffffff, WKUP_MOD, PM_WKST);
8bd22949 KH	199
8bd22949 KH	200	/* Try to enter MPU retention */
c4d7e58f	201	omap2_prm_write_mod_reg((0x01 << OMAP_POWERSTATE_SHIFT) \|
2fd0f75c	202	OMAP_LOGICRETSTATE_MASK,
37903009	203	MPU_MOD, OMAP2_PM_PWSTCTRL);
8bd22949 KH	204	} else {
	205	/* Block MPU retention */
	206
c4d7e58f	207	omap2_prm_write_mod_reg(OMAP_LOGICRETSTATE_MASK, MPU_MOD,
37903009	208	OMAP2_PM_PWSTCTRL);
8bd22949 KH	209	only_idle = 1;
	210	}
	211
8bd22949	212	omap2_sram_idle();
8bd22949 KH	213	}
	214
	215	static int omap2_can_sleep(void)
	216	{
	217	if (omap2_fclks_active())
	218	return 0;
	219	if (osc_ck->usecount > 1)
	220	return 0;
	221	if (omap_dma_running())
	222	return 0;
	223
	224	return 1;
	225	}
	226
	227	static void omap2_pm_idle(void)
	228	{
	229	local_irq_disable();
	230	local_fiq_disable();
	231
	232	if (!omap2_can_sleep()) {
94434535	233	if (omap_irq_pending())
8bd22949 KH	234	goto out;
	235	omap2_enter_mpu_retention();
	236	goto out;
	237	}
	238
94434535	239	if (omap_irq_pending())
8bd22949 KH	240	goto out;
	241
	242	omap2_enter_full_retention();
	243
	244	out:
	245	local_fiq_enable();
	246	local_irq_enable();
	247	}
	248
05fad3e7	249	#ifdef CONFIG_SUSPEND
e83df17f KH	250	static int omap2_pm_begin(suspend_state_t state)
e83df17f KH	251	{
8bd22949	252	disable_hlt();
c166381d	253	suspend_state = state;
8bd22949 KH	254	return 0;
	255	}
	256
	257	static int omap2_pm_suspend(void)
	258	{
	259	u32 wken_wkup, mir1;
	260
c4d7e58f	261	wken_wkup = omap2_prm_read_mod_reg(WKUP_MOD, PM_WKEN);
2fd0f75c	262	wken_wkup &= ~OMAP24XX_EN_GPT1_MASK;
c4d7e58f	263	omap2_prm_write_mod_reg(wken_wkup, WKUP_MOD, PM_WKEN);
8bd22949 KH	264
	265	/* Mask GPT1 */
	266	mir1 = omap_readl(0x480fe0a4);
	267	omap_writel(1 << 5, 0x480fe0ac);
	268
	269	omap2_enter_full_retention();
	270
	271	omap_writel(mir1, 0x480fe0a4);
c4d7e58f	272	omap2_prm_write_mod_reg(wken_wkup, WKUP_MOD, PM_WKEN);
8bd22949 KH	273
	274	return 0;
	275	}
	276
	277	static int omap2_pm_enter(suspend_state_t state)
	278	{
	279	int ret = 0;
	280
	281	switch (state) {
	282	case PM_SUSPEND_STANDBY:
	283	case PM_SUSPEND_MEM:
	284	ret = omap2_pm_suspend();
	285	break;
	286	default:
	287	ret = -EINVAL;
	288	}
	289
	290	return ret;
	291	}
	292
e83df17f KH	293	static void omap2_pm_end(void)
	294	{
	295	suspend_state = PM_SUSPEND_ON;
c166381d	296	enable_hlt();
e83df17f KH	297	}
e83df17f KH	298
2f55ac07	299	static const struct platform_suspend_ops omap_pm_ops = {
e83df17f	300	.begin = omap2_pm_begin,
8bd22949	301	.enter = omap2_pm_enter,
e83df17f	302	.end = omap2_pm_end,
8bd22949 KH	303	.valid = suspend_valid_only_mem,
8bd22949 KH	304	};
05fad3e7 KH	305	#else
	306	static const struct platform_suspend_ops __initdata omap_pm_ops;
	307	#endif /* CONFIG_SUSPEND */
8bd22949	308
369d5614 PW	309	/* XXX This function should be shareable between OMAP2xxx and OMAP3 */
369d5614 PW	310	static int __init clkdms_setup(struct clockdomain clkdm, void unused)
8bd22949	311	{
369d5614	312	if (clkdm->flags & CLKDM_CAN_ENABLE_AUTO)
5cd1937b	313	clkdm_allow_idle(clkdm);
369d5614 PW	314	else if (clkdm->flags & CLKDM_CAN_FORCE_SLEEP &&
369d5614 PW	315	atomic_read(&clkdm->usecount) == 0)
68b921ad	316	clkdm_sleep(clkdm);
8bd22949 KH	317	return 0;
	318	}
	319
	320	static void __init prcm_setup_regs(void)
	321	{
	322	int i, num_mem_banks;
	323	struct powerdomain *pwrdm;
	324
4ef70c06 PW	325	/*
	326	* Enable autoidle
	327	* XXX This should be handled by hwmod code or PRCM init code
	328	*/
c4d7e58f	329	omap2_prm_write_mod_reg(OMAP24XX_AUTOIDLE_MASK, OCP_MOD,
8bd22949 KH	330	OMAP2_PRCM_SYSCONFIG_OFFSET);
8bd22949 KH	331
8bd22949 KH	332	/*
	333	* Set CORE powerdomain memory banks to retain their contents
	334	* during RETENTION
	335	*/
	336	num_mem_banks = pwrdm_get_mem_bank_count(core_pwrdm);
	337	for (i = 0; i < num_mem_banks; i++)
	338	pwrdm_set_mem_retst(core_pwrdm, i, PWRDM_POWER_RET);
	339
	340	/* Set CORE powerdomain's next power state to RETENTION */
	341	pwrdm_set_next_pwrst(core_pwrdm, PWRDM_POWER_RET);
	342
	343	/*
	344	* Set MPU powerdomain's next power state to RETENTION;
	345	* preserve logic state during retention
	346	*/
	347	pwrdm_set_logic_retst(mpu_pwrdm, PWRDM_POWER_RET);
	348	pwrdm_set_next_pwrst(mpu_pwrdm, PWRDM_POWER_RET);
	349
	350	/* Force-power down DSP, GFX powerdomains */
	351
	352	pwrdm = clkdm_get_pwrdm(dsp_clkdm);
	353	pwrdm_set_next_pwrst(pwrdm, PWRDM_POWER_OFF);
68b921ad	354	clkdm_sleep(dsp_clkdm);
8bd22949 KH	355
	356	pwrdm = clkdm_get_pwrdm(gfx_clkdm);
	357	pwrdm_set_next_pwrst(pwrdm, PWRDM_POWER_OFF);
68b921ad	358	clkdm_sleep(gfx_clkdm);
8bd22949	359
51d070af	360	/* Enable hardware-supervised idle for all clkdms */
369d5614 PW	361	clkdm_for_each(clkdms_setup, NULL);
369d5614 PW	362	clkdm_add_wkdep(mpu_clkdm, wkup_clkdm);
8bd22949	363
8bd22949 KH	364	/* REVISIT: Configure number of 32 kHz clock cycles for sys_clk
8bd22949 KH	365	* stabilisation */
c4d7e58f PW	366	omap2_prm_write_mod_reg(15 << OMAP_SETUP_TIME_SHIFT, OMAP24XX_GR_MOD,
c4d7e58f PW	367	OMAP2_PRCM_CLKSSETUP_OFFSET);
8bd22949 KH	368
8bd22949 KH	369	/* Configure automatic voltage transition */
c4d7e58f PW	370	omap2_prm_write_mod_reg(2 << OMAP_SETUP_TIME_SHIFT, OMAP24XX_GR_MOD,
	371	OMAP2_PRCM_VOLTSETUP_OFFSET);
	372	omap2_prm_write_mod_reg(OMAP24XX_AUTO_EXTVOLT_MASK \|
	373	(0x1 << OMAP24XX_SETOFF_LEVEL_SHIFT) \|
	374	OMAP24XX_MEMRETCTRL_MASK \|
	375	(0x1 << OMAP24XX_SETRET_LEVEL_SHIFT) \|
	376	(0x0 << OMAP24XX_VOLT_LEVEL_SHIFT),
	377	OMAP24XX_GR_MOD, OMAP2_PRCM_VOLTCTRL_OFFSET);
8bd22949 KH	378
8bd22949 KH	379	/* Enable wake-up events */
c4d7e58f PW	380	omap2_prm_write_mod_reg(OMAP24XX_EN_GPIOS_MASK \| OMAP24XX_EN_GPT1_MASK,
c4d7e58f PW	381	WKUP_MOD, PM_WKEN);
8bd22949 KH	382	}
8bd22949 KH	383
7cc515f7	384	static int __init omap2_pm_init(void)
8bd22949 KH	385	{
	386	u32 l;
	387
	388	if (!cpu_is_omap24xx())
	389	return -ENODEV;
	390
	391	printk(KERN_INFO "Power Management for OMAP2 initializing\n");
c4d7e58f	392	l = omap2_prm_read_mod_reg(OCP_MOD, OMAP2_PRCM_REVISION_OFFSET);
8bd22949 KH	393	printk(KERN_INFO "PRCM revision %d.%d\n", (l >> 4) & 0x0f, l & 0x0f);
8bd22949 KH	394
369d5614	395	/* Look up important powerdomains */
8bd22949 KH	396
	397	mpu_pwrdm = pwrdm_lookup("mpu_pwrdm");
	398	if (!mpu_pwrdm)
	399	pr_err("PM: mpu_pwrdm not found\n");
	400
	401	core_pwrdm = pwrdm_lookup("core_pwrdm");
	402	if (!core_pwrdm)
	403	pr_err("PM: core_pwrdm not found\n");
	404
369d5614 PW	405	/* Look up important clockdomains */
	406
	407	mpu_clkdm = clkdm_lookup("mpu_clkdm");
	408	if (!mpu_clkdm)
	409	pr_err("PM: mpu_clkdm not found\n");
	410
	411	wkup_clkdm = clkdm_lookup("wkup_clkdm");
	412	if (!wkup_clkdm)
	413	pr_err("PM: wkup_clkdm not found\n");
	414
8bd22949 KH	415	dsp_clkdm = clkdm_lookup("dsp_clkdm");
8bd22949 KH	416	if (!dsp_clkdm)
369d5614	417	pr_err("PM: dsp_clkdm not found\n");
8bd22949 KH	418
	419	gfx_clkdm = clkdm_lookup("gfx_clkdm");
	420	if (!gfx_clkdm)
	421	pr_err("PM: gfx_clkdm not found\n");
	422
	423
	424	osc_ck = clk_get(NULL, "osc_ck");
	425	if (IS_ERR(osc_ck)) {
	426	printk(KERN_ERR "could not get osc_ck\n");
	427	return -ENODEV;
	428	}
	429
	430	if (cpu_is_omap242x()) {
	431	emul_ck = clk_get(NULL, "emul_ck");
	432	if (IS_ERR(emul_ck)) {
	433	printk(KERN_ERR "could not get emul_ck\n");
	434	clk_put(osc_ck);
	435	return -ENODEV;
	436	}
	437	}
	438
	439	prcm_setup_regs();
	440
	441	/* Hack to prevent MPU retention when STI console is enabled. */
	442	{
	443	const struct omap_sti_console_config *sti;
	444
	445	sti = omap_get_config(OMAP_TAG_STI_CONSOLE,
	446	struct omap_sti_console_config);
	447	if (sti != NULL && sti->enable)
	448	sti_console_enabled = 1;
	449	}
	450
	451	/*
	452	* We copy the assembler sleep/wakeup routines to SRAM.
	453	* These routines need to be in SRAM as that's the only
	454	* memory the MPU can see when it wakes up.
	455	*/
	456	if (cpu_is_omap24xx()) {
	457	omap2_sram_idle = omap_sram_push(omap24xx_idle_loop_suspend,
	458	omap24xx_idle_loop_suspend_sz);
	459
	460	omap2_sram_suspend = omap_sram_push(omap24xx_cpu_suspend,
	461	omap24xx_cpu_suspend_sz);
	462	}
	463
	464	suspend_set_ops(&omap_pm_ops);
	465	pm_idle = omap2_pm_idle;
	466
	467	return 0;
	468	}
	469
	470	late_initcall(omap2_pm_init);