[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/control.h>
#include <plat/mux.h>
#include <plat/dma.h>
#include <plat/board.h>

#include "prm.h"
#include "prm-regbits-24xx.h"
#include "cm.h"
#include "cm-regbits-24xx.h"
#include "sdrc.h"
#include "pm.h"

#include <plat/powerdomain.h>
#include <plat/clockdomain.h>

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 = cm_read_mod_reg(CORE_MOD, CM_FCLKEN1);
	f2 = cm_read_mod_reg(CORE_MOD, OMAP24XX_CM_FCLKEN2);

	/* Ignore UART clocks.  These are handled by UART core (serial.c) */
	f1 &= ~(OMAP24XX_EN_UART1 | OMAP24XX_EN_UART2);
	f2 &= ~OMAP24XX_EN_UART3;

	if (f1 | f2)
		return 1;
	return 0;
}

static void omap2_enter_full_retention(void)
{
	u32 l;
	struct timespec ts_preidle, ts_postidle, ts_idle;

	/* 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? */
	prm_write_mod_reg(0xffffffff, CORE_MOD, PM_WKST1);
	prm_write_mod_reg(0xffffffff, CORE_MOD, OMAP24XX_PM_WKST2);
	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(PWRDM_POWER_RET);

	if (omap2_pm_debug) {
		omap2_pm_dump(0, 0, 0);
		getnstimeofday(&ts_preidle);
	}

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

	omap_uart_prepare_idle(0);
	omap_uart_prepare_idle(1);
	omap_uart_prepare_idle(2);

	/* 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));

	omap_uart_resume_idle(2);
	omap_uart_resume_idle(1);
	omap_uart_resume_idle(0);

no_sleep:
	if (omap2_pm_debug) {
		unsigned long long tmp;

		getnstimeofday(&ts_postidle);
		ts_idle = timespec_sub(ts_postidle, ts_preidle);
		tmp = timespec_to_ns(&ts_idle) * NSEC_PER_USEC;
		omap2_pm_dump(0, 1, tmp);
	}
	omap2_gpio_resume_after_idle();

	clk_enable(osc_ck);

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

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

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

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

static int omap2_i2c_active(void)
{
	u32 l;

	l = cm_read_mod_reg(CORE_MOD, CM_FCLKEN1);
	return l & (OMAP2420_EN_I2C2 | OMAP2420_EN_I2C1);
}

static int sti_console_enabled;

static int omap2_allow_mpu_retention(void)
{
	u32 l;

	/* Check for MMC, UART2, UART1, McSPI2, McSPI1 and DSS1. */
	l = cm_read_mod_reg(CORE_MOD, CM_FCLKEN1);
	if (l & (OMAP2420_EN_MMC | OMAP24XX_EN_UART2 |
		 OMAP24XX_EN_UART1 | OMAP24XX_EN_MCSPI2 |
		 OMAP24XX_EN_MCSPI1 | OMAP24XX_EN_DSS1))
		return 0;
	/* Check for UART3. */
	l = cm_read_mod_reg(CORE_MOD, OMAP24XX_CM_FCLKEN2);
	if (l & OMAP24XX_EN_UART3)
		return 0;
	if (sti_console_enabled)
		return 0;

	return 1;
}

static void omap2_enter_mpu_retention(void)
{
	int only_idle = 0;
	struct timespec ts_preidle, ts_postidle, ts_idle;

	/* 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? */
		prm_write_mod_reg(0xffffffff, CORE_MOD, PM_WKST1);
		prm_write_mod_reg(0xffffffff, CORE_MOD, OMAP24XX_PM_WKST2);
		prm_write_mod_reg(0xffffffff, WKUP_MOD, PM_WKST);

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

		prm_write_mod_reg(OMAP_LOGICRETSTATE, MPU_MOD,
						 OMAP2_PM_PWSTCTRL);
		only_idle = 1;
	}

	if (omap2_pm_debug) {
		omap2_pm_dump(only_idle ? 2 : 1, 0, 0);
		getnstimeofday(&ts_preidle);
	}

	omap2_sram_idle();

	if (omap2_pm_debug) {
		unsigned long long tmp;

		getnstimeofday(&ts_postidle);
		ts_idle = timespec_sub(ts_postidle, ts_preidle);
		tmp = timespec_to_ns(&ts_idle) * NSEC_PER_USEC;
		omap2_pm_dump(only_idle ? 2 : 1, 1, tmp);
	}
}

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();
}

static int omap2_pm_prepare(void)
{
	/* We cannot sleep in idle until we have resumed */
	disable_hlt();
	return 0;
}

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

	wken_wkup = prm_read_mod_reg(WKUP_MOD, PM_WKEN);
	prm_write_mod_reg(wken_wkup & ~OMAP24XX_EN_GPT1, WKUP_MOD, PM_WKEN);

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

	omap_uart_prepare_suspend();
	omap2_enter_full_retention();

	omap_writel(mir1, 0x480fe0a4);
	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_finish(void)
{
	enable_hlt();
}

static struct platform_suspend_ops omap_pm_ops = {
	.prepare	= omap2_pm_prepare,
	.enter		= omap2_pm_enter,
	.finish		= omap2_pm_finish,
	.valid		= suspend_valid_only_mem,
};

/* XXX This function should be shareable between OMAP2xxx and OMAP3 */
static int __init clkdms_setup(struct clockdomain *clkdm, void *unused)
{
	clkdm_clear_all_wkdeps(clkdm);
	clkdm_clear_all_sleepdeps(clkdm);

	if (clkdm->flags & CLKDM_CAN_ENABLE_AUTO)
		omap2_clkdm_allow_idle(clkdm);
	else if (clkdm->flags & CLKDM_CAN_FORCE_SLEEP &&
		 atomic_read(&clkdm->usecount) == 0)
		omap2_clkdm_sleep(clkdm);
	return 0;
}

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

	/* Enable autoidle */
	prm_write_mod_reg(OMAP24XX_AUTOIDLE, 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);
	omap2_clkdm_sleep(dsp_clkdm);

	pwrdm = clkdm_get_pwrdm(gfx_clkdm);
	pwrdm_set_next_pwrst(pwrdm, PWRDM_POWER_OFF);
	omap2_clkdm_sleep(gfx_clkdm);

	/*
	 * Clear clockdomain wakeup dependencies and enable
	 * hardware-supervised idle for all clkdms
	 */
	clkdm_for_each(clkdms_setup, NULL);
	clkdm_add_wkdep(mpu_clkdm, wkup_clkdm);

	/* Enable clock autoidle for all domains */
	cm_write_mod_reg(OMAP24XX_AUTO_CAM |
			 OMAP24XX_AUTO_MAILBOXES |
			 OMAP24XX_AUTO_WDT4 |
			 OMAP2420_AUTO_WDT3 |
			 OMAP24XX_AUTO_MSPRO |
			 OMAP2420_AUTO_MMC |
			 OMAP24XX_AUTO_FAC |
			 OMAP2420_AUTO_EAC |
			 OMAP24XX_AUTO_HDQ |
			 OMAP24XX_AUTO_UART2 |
			 OMAP24XX_AUTO_UART1 |
			 OMAP24XX_AUTO_I2C2 |
			 OMAP24XX_AUTO_I2C1 |
			 OMAP24XX_AUTO_MCSPI2 |
			 OMAP24XX_AUTO_MCSPI1 |
			 OMAP24XX_AUTO_MCBSP2 |
			 OMAP24XX_AUTO_MCBSP1 |
			 OMAP24XX_AUTO_GPT12 |
			 OMAP24XX_AUTO_GPT11 |
			 OMAP24XX_AUTO_GPT10 |
			 OMAP24XX_AUTO_GPT9 |
			 OMAP24XX_AUTO_GPT8 |
			 OMAP24XX_AUTO_GPT7 |
			 OMAP24XX_AUTO_GPT6 |
			 OMAP24XX_AUTO_GPT5 |
			 OMAP24XX_AUTO_GPT4 |
			 OMAP24XX_AUTO_GPT3 |
			 OMAP24XX_AUTO_GPT2 |
			 OMAP2420_AUTO_VLYNQ |
			 OMAP24XX_AUTO_DSS,
			 CORE_MOD, CM_AUTOIDLE1);
	cm_write_mod_reg(OMAP24XX_AUTO_UART3 |
			 OMAP24XX_AUTO_SSI |
			 OMAP24XX_AUTO_USB,
			 CORE_MOD, CM_AUTOIDLE2);
	cm_write_mod_reg(OMAP24XX_AUTO_SDRC |
			 OMAP24XX_AUTO_GPMC |
			 OMAP24XX_AUTO_SDMA,
			 CORE_MOD, CM_AUTOIDLE3);
	cm_write_mod_reg(OMAP24XX_AUTO_PKA |
			 OMAP24XX_AUTO_AES |
			 OMAP24XX_AUTO_RNG |
			 OMAP24XX_AUTO_SHA |
			 OMAP24XX_AUTO_DES,
			 CORE_MOD, OMAP24XX_CM_AUTOIDLE4);

	cm_write_mod_reg(OMAP2420_AUTO_DSP_IPI, OMAP24XX_DSP_MOD, CM_AUTOIDLE);

	/* Put DPLL and both APLLs into autoidle mode */
	cm_write_mod_reg((0x03 << OMAP24XX_AUTO_DPLL_SHIFT) |
			 (0x03 << OMAP24XX_AUTO_96M_SHIFT) |
			 (0x03 << OMAP24XX_AUTO_54M_SHIFT),
			 PLL_MOD, CM_AUTOIDLE);

	cm_write_mod_reg(OMAP24XX_AUTO_OMAPCTRL |
			 OMAP24XX_AUTO_WDT1 |
			 OMAP24XX_AUTO_MPU_WDT |
			 OMAP24XX_AUTO_GPIOS |
			 OMAP24XX_AUTO_32KSYNC |
			 OMAP24XX_AUTO_GPT1,
			 WKUP_MOD, CM_AUTOIDLE);

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

	/* Configure automatic voltage transition */
	prm_write_mod_reg(2 << OMAP_SETUP_TIME_SHIFT, OMAP24XX_GR_MOD,
			  OMAP2_PRCM_VOLTSETUP_OFFSET);
	prm_write_mod_reg(OMAP24XX_AUTO_EXTVOLT |
			  (0x1 << OMAP24XX_SETOFF_LEVEL_SHIFT) |
			  OMAP24XX_MEMRETCTRL |
			  (0x1 << OMAP24XX_SETRET_LEVEL_SHIFT) |
			  (0x0 << OMAP24XX_VOLT_LEVEL_SHIFT),
			  OMAP24XX_GR_MOD, OMAP2_PRCM_VOLTCTRL_OFFSET);

	/* Enable wake-up events */
	prm_write_mod_reg(OMAP24XX_EN_GPIOS | OMAP24XX_EN_GPT1,
			  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 = 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>
	40	#include <plat/sram.h>
	41	#include <plat/control.h>
	42	#include <plat/mux.h>
	43	#include <plat/dma.h>
	44	#include <plat/board.h>
8bd22949 KH	45
	46	#include "prm.h"
	47	#include "prm-regbits-24xx.h"
	48	#include "cm.h"
	49	#include "cm-regbits-24xx.h"
	50	#include "sdrc.h"
	51	#include "pm.h"
	52
ce491cf8 TL	53	#include <plat/powerdomain.h>
ce491cf8 TL	54	#include <plat/clockdomain.h>
8bd22949 KH	55
	56	static void (*omap2_sram_idle)(void);
	57	static void (omap2_sram_suspend)(u32 dllctrl, void __iomem sdrc_dlla_ctrl,
	58	void __iomem *sdrc_power);
	59
369d5614 PW	60	static struct powerdomain mpu_pwrdm, core_pwrdm;
369d5614 PW	61	static struct clockdomain dsp_clkdm, mpu_clkdm, wkup_clkdm, gfx_clkdm;
8bd22949 KH	62
	63	static struct clk osc_ck, emul_ck;
	64
	65	static int omap2_fclks_active(void)
	66	{
	67	u32 f1, f2;
	68
	69	f1 = cm_read_mod_reg(CORE_MOD, CM_FCLKEN1);
	70	f2 = cm_read_mod_reg(CORE_MOD, OMAP24XX_CM_FCLKEN2);
4af4016c KH	71
	72	/* Ignore UART clocks. These are handled by UART core (serial.c) */
	73	f1 &= ~(OMAP24XX_EN_UART1 \| OMAP24XX_EN_UART2);
	74	f2 &= ~OMAP24XX_EN_UART3;
	75
8bd22949 KH	76	if (f1 \| f2)
	77	return 1;
	78	return 0;
	79	}
	80
8bd22949 KH	81	static void omap2_enter_full_retention(void)
	82	{
	83	u32 l;
	84	struct timespec ts_preidle, ts_postidle, ts_idle;
	85
	86	/* There is 1 reference hold for all children of the oscillator
	87	* clock, the following will remove it. If no one else uses the
	88	* oscillator itself it will be disabled if/when we enter retention
	89	* mode.
	90	*/
	91	clk_disable(osc_ck);
	92
	93	/* Clear old wake-up events */
	94	/* REVISIT: These write to reserved bits? */
	95	prm_write_mod_reg(0xffffffff, CORE_MOD, PM_WKST1);
	96	prm_write_mod_reg(0xffffffff, CORE_MOD, OMAP24XX_PM_WKST2);
	97	prm_write_mod_reg(0xffffffff, WKUP_MOD, PM_WKST);
	98
	99	/*
	100	* Set MPU powerdomain's next power state to RETENTION;
	101	* preserve logic state during retention
	102	*/
	103	pwrdm_set_logic_retst(mpu_pwrdm, PWRDM_POWER_RET);
	104	pwrdm_set_next_pwrst(mpu_pwrdm, PWRDM_POWER_RET);
	105
	106	/* Workaround to kill USB */
	107	l = omap_ctrl_readl(OMAP2_CONTROL_DEVCONF0) \| OMAP24XX_USBSTANDBYCTRL;
	108	omap_ctrl_writel(l, OMAP2_CONTROL_DEVCONF0);
	109
43ffcd9a	110	omap2_gpio_prepare_for_idle(PWRDM_POWER_RET);
8bd22949 KH	111
	112	if (omap2_pm_debug) {
	113	omap2_pm_dump(0, 0, 0);
	114	getnstimeofday(&ts_preidle);
	115	}
	116
	117	/* One last check for pending IRQs to avoid extra latency due
	118	* to sleeping unnecessarily. */
94434535	119	if (omap_irq_pending())
8bd22949 KH	120	goto no_sleep;
8bd22949 KH	121
4af4016c KH	122	omap_uart_prepare_idle(0);
	123	omap_uart_prepare_idle(1);
	124	omap_uart_prepare_idle(2);
	125
8bd22949 KH	126	/* Jump to SRAM suspend code */
	127	omap2_sram_suspend(sdrc_read_reg(SDRC_DLLA_CTRL),
	128	OMAP_SDRC_REGADDR(SDRC_DLLA_CTRL),
	129	OMAP_SDRC_REGADDR(SDRC_POWER));
8bd22949	130
4af4016c KH	131	omap_uart_resume_idle(2);
	132	omap_uart_resume_idle(1);
	133	omap_uart_resume_idle(0);
	134
	135	no_sleep:
8bd22949 KH	136	if (omap2_pm_debug) {
	137	unsigned long long tmp;
	138
	139	getnstimeofday(&ts_postidle);
	140	ts_idle = timespec_sub(ts_postidle, ts_preidle);
	141	tmp = timespec_to_ns(&ts_idle) * NSEC_PER_USEC;
	142	omap2_pm_dump(0, 1, tmp);
	143	}
43ffcd9a	144	omap2_gpio_resume_after_idle();
8bd22949 KH	145
	146	clk_enable(osc_ck);
	147
	148	/* clear CORE wake-up events */
	149	prm_write_mod_reg(0xffffffff, CORE_MOD, PM_WKST1);
	150	prm_write_mod_reg(0xffffffff, CORE_MOD, OMAP24XX_PM_WKST2);
	151
	152	/* wakeup domain events - bit 1: GPT1, bit5 GPIO */
	153	prm_clear_mod_reg_bits(0x4 \| 0x1, WKUP_MOD, PM_WKST);
	154
	155	/* MPU domain wake events */
	156	l = prm_read_mod_reg(OCP_MOD, OMAP2_PRCM_IRQSTATUS_MPU_OFFSET);
	157	if (l & 0x01)
	158	prm_write_mod_reg(0x01, OCP_MOD,
	159	OMAP2_PRCM_IRQSTATUS_MPU_OFFSET);
	160	if (l & 0x20)
	161	prm_write_mod_reg(0x20, OCP_MOD,
	162	OMAP2_PRCM_IRQSTATUS_MPU_OFFSET);
	163
	164	/* Mask future PRCM-to-MPU interrupts */
	165	prm_write_mod_reg(0x0, OCP_MOD, OMAP2_PRCM_IRQSTATUS_MPU_OFFSET);
	166	}
	167
	168	static int omap2_i2c_active(void)
	169	{
	170	u32 l;
	171
	172	l = cm_read_mod_reg(CORE_MOD, CM_FCLKEN1);
	173	return l & (OMAP2420_EN_I2C2 \| OMAP2420_EN_I2C1);
	174	}
	175
	176	static int sti_console_enabled;
	177
	178	static int omap2_allow_mpu_retention(void)
	179	{
	180	u32 l;
	181
	182	/* Check for MMC, UART2, UART1, McSPI2, McSPI1 and DSS1. */
	183	l = cm_read_mod_reg(CORE_MOD, CM_FCLKEN1);
	184	if (l & (OMAP2420_EN_MMC \| OMAP24XX_EN_UART2 \|
	185	OMAP24XX_EN_UART1 \| OMAP24XX_EN_MCSPI2 \|
	186	OMAP24XX_EN_MCSPI1 \| OMAP24XX_EN_DSS1))
	187	return 0;
	188	/* Check for UART3. */
	189	l = cm_read_mod_reg(CORE_MOD, OMAP24XX_CM_FCLKEN2);
	190	if (l & OMAP24XX_EN_UART3)
	191	return 0;
	192	if (sti_console_enabled)
	193	return 0;
	194
	195	return 1;
	196	}
	197
	198	static void omap2_enter_mpu_retention(void)
	199	{
	200	int only_idle = 0;
	201	struct timespec ts_preidle, ts_postidle, ts_idle;
	202
	203	/* Putting MPU into the WFI state while a transfer is active
	204	* seems to cause the I2C block to timeout. Why? Good question. */
	205	if (omap2_i2c_active())
	206	return;
	207
	208	/* The peripherals seem not to be able to wake up the MPU when
209	* it is in retention mode. */
210	if (omap2_allow_mpu_retention()) {
211	/* REVISIT: These write to reserved bits? */
212	prm_write_mod_reg(0xffffffff, CORE_MOD, PM_WKST1);
213	prm_write_mod_reg(0xffffffff, CORE_MOD, OMAP24XX_PM_WKST2);
214	prm_write_mod_reg(0xffffffff, WKUP_MOD, PM_WKST);
215
216	/* Try to enter MPU retention */
217	prm_write_mod_reg((0x01 << OMAP_POWERSTATE_SHIFT) \|
218	OMAP_LOGICRETSTATE,
37903009	219	MPU_MOD, OMAP2_PM_PWSTCTRL);
8bd22949 KH	220	} else {
	221	/* Block MPU retention */
	222
37903009 AP	223	prm_write_mod_reg(OMAP_LOGICRETSTATE, MPU_MOD,
37903009 AP	224	OMAP2_PM_PWSTCTRL);
8bd22949 KH	225	only_idle = 1;
	226	}
	227
	228	if (omap2_pm_debug) {
	229	omap2_pm_dump(only_idle ? 2 : 1, 0, 0);
	230	getnstimeofday(&ts_preidle);
	231	}
	232
	233	omap2_sram_idle();
	234
	235	if (omap2_pm_debug) {
	236	unsigned long long tmp;
	237
	238	getnstimeofday(&ts_postidle);
	239	ts_idle = timespec_sub(ts_postidle, ts_preidle);
	240	tmp = timespec_to_ns(&ts_idle) * NSEC_PER_USEC;
	241	omap2_pm_dump(only_idle ? 2 : 1, 1, tmp);
	242	}
	243	}
	244
	245	static int omap2_can_sleep(void)
	246	{
	247	if (omap2_fclks_active())
	248	return 0;
	249	if (osc_ck->usecount > 1)
	250	return 0;
	251	if (omap_dma_running())
	252	return 0;
	253
	254	return 1;
	255	}
	256
	257	static void omap2_pm_idle(void)
	258	{
	259	local_irq_disable();
	260	local_fiq_disable();
	261
	262	if (!omap2_can_sleep()) {
94434535	263	if (omap_irq_pending())
8bd22949 KH	264	goto out;
	265	omap2_enter_mpu_retention();
	266	goto out;
	267	}
	268
94434535	269	if (omap_irq_pending())
8bd22949 KH	270	goto out;
	271
	272	omap2_enter_full_retention();
	273
	274	out:
	275	local_fiq_enable();
	276	local_irq_enable();
	277	}
	278
	279	static int omap2_pm_prepare(void)
	280	{
	281	/* We cannot sleep in idle until we have resumed */
	282	disable_hlt();
	283	return 0;
	284	}
	285
	286	static int omap2_pm_suspend(void)
	287	{
	288	u32 wken_wkup, mir1;
	289
	290	wken_wkup = prm_read_mod_reg(WKUP_MOD, PM_WKEN);
	291	prm_write_mod_reg(wken_wkup & ~OMAP24XX_EN_GPT1, WKUP_MOD, PM_WKEN);
	292
	293	/* Mask GPT1 */
	294	mir1 = omap_readl(0x480fe0a4);
	295	omap_writel(1 << 5, 0x480fe0ac);
	296
4af4016c	297	omap_uart_prepare_suspend();
8bd22949 KH	298	omap2_enter_full_retention();
	299
	300	omap_writel(mir1, 0x480fe0a4);
	301	prm_write_mod_reg(wken_wkup, WKUP_MOD, PM_WKEN);
	302
	303	return 0;
	304	}
	305
	306	static int omap2_pm_enter(suspend_state_t state)
	307	{
	308	int ret = 0;
	309
	310	switch (state) {
	311	case PM_SUSPEND_STANDBY:
	312	case PM_SUSPEND_MEM:
	313	ret = omap2_pm_suspend();
	314	break;
	315	default:
	316	ret = -EINVAL;
	317	}
	318
	319	return ret;
	320	}
	321
	322	static void omap2_pm_finish(void)
	323	{
	324	enable_hlt();
	325	}
	326
	327	static struct platform_suspend_ops omap_pm_ops = {
	328	.prepare = omap2_pm_prepare,
	329	.enter = omap2_pm_enter,
	330	.finish = omap2_pm_finish,
	331	.valid = suspend_valid_only_mem,
	332	};
	333
369d5614 PW	334	/* XXX This function should be shareable between OMAP2xxx and OMAP3 */
369d5614 PW	335	static int __init clkdms_setup(struct clockdomain clkdm, void unused)
8bd22949	336	{
369d5614 PW	337	clkdm_clear_all_wkdeps(clkdm);
	338	clkdm_clear_all_sleepdeps(clkdm);
	339
	340	if (clkdm->flags & CLKDM_CAN_ENABLE_AUTO)
	341	omap2_clkdm_allow_idle(clkdm);
	342	else if (clkdm->flags & CLKDM_CAN_FORCE_SLEEP &&
	343	atomic_read(&clkdm->usecount) == 0)
	344	omap2_clkdm_sleep(clkdm);
8bd22949 KH	345	return 0;
	346	}
	347
	348	static void __init prcm_setup_regs(void)
	349	{
	350	int i, num_mem_banks;
	351	struct powerdomain *pwrdm;
	352
	353	/* Enable autoidle */
	354	prm_write_mod_reg(OMAP24XX_AUTOIDLE, OCP_MOD,
	355	OMAP2_PRCM_SYSCONFIG_OFFSET);
	356
8bd22949 KH	357	/*
	358	* Set CORE powerdomain memory banks to retain their contents
	359	* during RETENTION
	360	*/
	361	num_mem_banks = pwrdm_get_mem_bank_count(core_pwrdm);
	362	for (i = 0; i < num_mem_banks; i++)
	363	pwrdm_set_mem_retst(core_pwrdm, i, PWRDM_POWER_RET);
	364
	365	/* Set CORE powerdomain's next power state to RETENTION */
	366	pwrdm_set_next_pwrst(core_pwrdm, PWRDM_POWER_RET);
	367
	368	/*
	369	* Set MPU powerdomain's next power state to RETENTION;
	370	* preserve logic state during retention
	371	*/
	372	pwrdm_set_logic_retst(mpu_pwrdm, PWRDM_POWER_RET);
	373	pwrdm_set_next_pwrst(mpu_pwrdm, PWRDM_POWER_RET);
	374
	375	/* Force-power down DSP, GFX powerdomains */
	376
	377	pwrdm = clkdm_get_pwrdm(dsp_clkdm);
	378	pwrdm_set_next_pwrst(pwrdm, PWRDM_POWER_OFF);
	379	omap2_clkdm_sleep(dsp_clkdm);
	380
	381	pwrdm = clkdm_get_pwrdm(gfx_clkdm);
	382	pwrdm_set_next_pwrst(pwrdm, PWRDM_POWER_OFF);
	383	omap2_clkdm_sleep(gfx_clkdm);
	384
369d5614 PW	385	/*
	386	* Clear clockdomain wakeup dependencies and enable
	387	* hardware-supervised idle for all clkdms
	388	*/
	389	clkdm_for_each(clkdms_setup, NULL);
	390	clkdm_add_wkdep(mpu_clkdm, wkup_clkdm);
8bd22949 KH	391
	392	/* Enable clock autoidle for all domains */
	393	cm_write_mod_reg(OMAP24XX_AUTO_CAM \|
	394	OMAP24XX_AUTO_MAILBOXES \|
	395	OMAP24XX_AUTO_WDT4 \|
	396	OMAP2420_AUTO_WDT3 \|
	397	OMAP24XX_AUTO_MSPRO \|
	398	OMAP2420_AUTO_MMC \|
	399	OMAP24XX_AUTO_FAC \|
	400	OMAP2420_AUTO_EAC \|
	401	OMAP24XX_AUTO_HDQ \|
	402	OMAP24XX_AUTO_UART2 \|
	403	OMAP24XX_AUTO_UART1 \|
	404	OMAP24XX_AUTO_I2C2 \|
	405	OMAP24XX_AUTO_I2C1 \|
	406	OMAP24XX_AUTO_MCSPI2 \|
	407	OMAP24XX_AUTO_MCSPI1 \|
	408	OMAP24XX_AUTO_MCBSP2 \|
	409	OMAP24XX_AUTO_MCBSP1 \|
	410	OMAP24XX_AUTO_GPT12 \|
	411	OMAP24XX_AUTO_GPT11 \|
	412	OMAP24XX_AUTO_GPT10 \|
	413	OMAP24XX_AUTO_GPT9 \|
	414	OMAP24XX_AUTO_GPT8 \|
	415	OMAP24XX_AUTO_GPT7 \|
	416	OMAP24XX_AUTO_GPT6 \|
	417	OMAP24XX_AUTO_GPT5 \|
	418	OMAP24XX_AUTO_GPT4 \|
	419	OMAP24XX_AUTO_GPT3 \|
	420	OMAP24XX_AUTO_GPT2 \|
	421	OMAP2420_AUTO_VLYNQ \|
	422	OMAP24XX_AUTO_DSS,
	423	CORE_MOD, CM_AUTOIDLE1);
	424	cm_write_mod_reg(OMAP24XX_AUTO_UART3 \|
	425	OMAP24XX_AUTO_SSI \|
	426	OMAP24XX_AUTO_USB,
	427	CORE_MOD, CM_AUTOIDLE2);
	428	cm_write_mod_reg(OMAP24XX_AUTO_SDRC \|
	429	OMAP24XX_AUTO_GPMC \|
	430	OMAP24XX_AUTO_SDMA,
	431	CORE_MOD, CM_AUTOIDLE3);
	432	cm_write_mod_reg(OMAP24XX_AUTO_PKA \|
	433	OMAP24XX_AUTO_AES \|
	434	OMAP24XX_AUTO_RNG \|
	435	OMAP24XX_AUTO_SHA \|
	436	OMAP24XX_AUTO_DES,
	437	CORE_MOD, OMAP24XX_CM_AUTOIDLE4);
	438
	439	cm_write_mod_reg(OMAP2420_AUTO_DSP_IPI, OMAP24XX_DSP_MOD, CM_AUTOIDLE);
	440
	441	/* Put DPLL and both APLLs into autoidle mode */
	442	cm_write_mod_reg((0x03 << OMAP24XX_AUTO_DPLL_SHIFT) \|
	443	(0x03 << OMAP24XX_AUTO_96M_SHIFT) \|
	444	(0x03 << OMAP24XX_AUTO_54M_SHIFT),
	445	PLL_MOD, CM_AUTOIDLE);
	446
	447	cm_write_mod_reg(OMAP24XX_AUTO_OMAPCTRL \|
	448	OMAP24XX_AUTO_WDT1 \|
	449	OMAP24XX_AUTO_MPU_WDT \|
	450	OMAP24XX_AUTO_GPIOS \|
	451	OMAP24XX_AUTO_32KSYNC \|
	452	OMAP24XX_AUTO_GPT1,
	453	WKUP_MOD, CM_AUTOIDLE);
	454
455	/* REVISIT: Configure number of 32 kHz clock cycles for sys_clk
456	* stabilisation */
457	prm_write_mod_reg(15 << OMAP_SETUP_TIME_SHIFT, OMAP24XX_GR_MOD,
458	OMAP2_PRCM_CLKSSETUP_OFFSET);
459
460	/* Configure automatic voltage transition */
461	prm_write_mod_reg(2 << OMAP_SETUP_TIME_SHIFT, OMAP24XX_GR_MOD,
462	OMAP2_PRCM_VOLTSETUP_OFFSET);
463	prm_write_mod_reg(OMAP24XX_AUTO_EXTVOLT \|
464	(0x1 << OMAP24XX_SETOFF_LEVEL_SHIFT) \|
465	OMAP24XX_MEMRETCTRL \|
466	(0x1 << OMAP24XX_SETRET_LEVEL_SHIFT) \|
467	(0x0 << OMAP24XX_VOLT_LEVEL_SHIFT),
468	OMAP24XX_GR_MOD, OMAP2_PRCM_VOLTCTRL_OFFSET);
469
470	/* Enable wake-up events */
471	prm_write_mod_reg(OMAP24XX_EN_GPIOS \| OMAP24XX_EN_GPT1,
472	WKUP_MOD, PM_WKEN);
473	}
474
7cc515f7	475	static int __init omap2_pm_init(void)
8bd22949 KH	476	{
	477	u32 l;
	478
	479	if (!cpu_is_omap24xx())
	480	return -ENODEV;
	481
	482	printk(KERN_INFO "Power Management for OMAP2 initializing\n");
	483	l = prm_read_mod_reg(OCP_MOD, OMAP2_PRCM_REVISION_OFFSET);
	484	printk(KERN_INFO "PRCM revision %d.%d\n", (l >> 4) & 0x0f, l & 0x0f);
	485
369d5614	486	/* Look up important powerdomains */
8bd22949 KH	487
	488	mpu_pwrdm = pwrdm_lookup("mpu_pwrdm");
	489	if (!mpu_pwrdm)
	490	pr_err("PM: mpu_pwrdm not found\n");
	491
	492	core_pwrdm = pwrdm_lookup("core_pwrdm");
	493	if (!core_pwrdm)
	494	pr_err("PM: core_pwrdm not found\n");
	495
369d5614 PW	496	/* Look up important clockdomains */
	497
	498	mpu_clkdm = clkdm_lookup("mpu_clkdm");
	499	if (!mpu_clkdm)
	500	pr_err("PM: mpu_clkdm not found\n");
	501
	502	wkup_clkdm = clkdm_lookup("wkup_clkdm");
	503	if (!wkup_clkdm)
	504	pr_err("PM: wkup_clkdm not found\n");
	505
8bd22949 KH	506	dsp_clkdm = clkdm_lookup("dsp_clkdm");
8bd22949 KH	507	if (!dsp_clkdm)
369d5614	508	pr_err("PM: dsp_clkdm not found\n");
8bd22949 KH	509
	510	gfx_clkdm = clkdm_lookup("gfx_clkdm");
	511	if (!gfx_clkdm)
	512	pr_err("PM: gfx_clkdm not found\n");
	513
	514
	515	osc_ck = clk_get(NULL, "osc_ck");
	516	if (IS_ERR(osc_ck)) {
	517	printk(KERN_ERR "could not get osc_ck\n");
	518	return -ENODEV;
	519	}
	520
	521	if (cpu_is_omap242x()) {
	522	emul_ck = clk_get(NULL, "emul_ck");
	523	if (IS_ERR(emul_ck)) {
	524	printk(KERN_ERR "could not get emul_ck\n");
	525	clk_put(osc_ck);
	526	return -ENODEV;
	527	}
	528	}
	529
	530	prcm_setup_regs();
	531
	532	/* Hack to prevent MPU retention when STI console is enabled. */
	533	{
	534	const struct omap_sti_console_config *sti;
	535
	536	sti = omap_get_config(OMAP_TAG_STI_CONSOLE,
	537	struct omap_sti_console_config);
	538	if (sti != NULL && sti->enable)
	539	sti_console_enabled = 1;
	540	}
	541
	542	/*
	543	* We copy the assembler sleep/wakeup routines to SRAM.
	544	* These routines need to be in SRAM as that's the only
	545	* memory the MPU can see when it wakes up.
	546	*/
	547	if (cpu_is_omap24xx()) {
	548	omap2_sram_idle = omap_sram_push(omap24xx_idle_loop_suspend,
	549	omap24xx_idle_loop_suspend_sz);
	550
	551	omap2_sram_suspend = omap_sram_push(omap24xx_cpu_suspend,
	552	omap24xx_cpu_suspend_sz);
	553	}
	554
	555	suspend_set_ops(&omap_pm_ops);
	556	pm_idle = omap2_pm_idle;
	557
	558	return 0;
	559	}
	560
	561	late_initcall(omap2_pm_init);