pm34xx.c

/*
 * OMAP3 Power Management Routines
 *
 * Copyright (C) 2006-2008 Nokia Corporation
 * Tony Lindgren <tony@atomide.com>
 * Jouni Hogander
 *
 * Copyright (C) 2007 Texas Instruments, Inc.
 * Rajendra Nayak <rnayak@ti.com>
 *
 * Copyright (C) 2005 Texas Instruments, Inc.
 * Richard Woodruff <r-woodruff2@ti.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/pm.h>
#include <linux/suspend.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/list.h>
#include <linux/err.h>
#include <linux/gpio.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/console.h>

#include <plat/sram.h>
#include <plat/clockdomain.h>
#include <plat/powerdomain.h>
#include <plat/serial.h>
#include <plat/sdrc.h>
#include <plat/prcm.h>
#include <plat/gpmc.h>
#include <plat/dma.h>

#include <asm/tlbflush.h>

#include "cm.h"
#include "cm-regbits-34xx.h"
#include "prm-regbits-34xx.h"

#include "prm.h"
#include "pm.h"
#include "sdrc.h"
#include "control.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

/* Scratchpad offsets */
#define OMAP343X_TABLE_ADDRESS_OFFSET	   0xc4
#define OMAP343X_TABLE_VALUE_OFFSET	   0xc0
#define OMAP343X_CONTROL_REG_VALUE_OFFSET  0xc8

/* pm34xx errata defined in pm.h */
u16 pm34xx_errata;

struct power_state {
	struct powerdomain *pwrdm;
	u32 next_state;
#ifdef CONFIG_SUSPEND
	u32 saved_state;
#endif
	struct list_head node;
};

static LIST_HEAD(pwrst_list);

static void (*_omap_sram_idle)(u32 *addr, int save_state);

static int (*_omap_save_secure_sram)(u32 *addr);

static struct powerdomain *mpu_pwrdm, *neon_pwrdm;
static struct powerdomain *core_pwrdm, *per_pwrdm;
static struct powerdomain *cam_pwrdm;

static inline void omap3_per_save_context(void)
{
	omap_gpio_save_context();
}

static inline void omap3_per_restore_context(void)
{
	omap_gpio_restore_context();
}

static void omap3_enable_io_chain(void)
{
	int timeout = 0;

	if (omap_rev() >= OMAP3430_REV_ES3_1) {
		prm_set_mod_reg_bits(OMAP3430_EN_IO_CHAIN_MASK, WKUP_MOD,
				     PM_WKEN);
		/* Do a readback to assure write has been done */
		prm_read_mod_reg(WKUP_MOD, PM_WKEN);

		while (!(prm_read_mod_reg(WKUP_MOD, PM_WKEN) &
			 OMAP3430_ST_IO_CHAIN_MASK)) {
			timeout++;
			if (timeout > 1000) {
				printk(KERN_ERR "Wake up daisy chain "
				       "activation failed.\n");
				return;
			}
			prm_set_mod_reg_bits(OMAP3430_ST_IO_CHAIN_MASK,
					     WKUP_MOD, PM_WKEN);
		}
	}
}

static void omap3_disable_io_chain(void)
{
	if (omap_rev() >= OMAP3430_REV_ES3_1)
		prm_clear_mod_reg_bits(OMAP3430_EN_IO_CHAIN_MASK, WKUP_MOD,
				       PM_WKEN);
}

static void omap3_core_save_context(void)
{
	u32 control_padconf_off;

	/* Save the padconf registers */
	control_padconf_off = omap_ctrl_readl(OMAP343X_CONTROL_PADCONF_OFF);
	control_padconf_off |= START_PADCONF_SAVE;
	omap_ctrl_writel(control_padconf_off, OMAP343X_CONTROL_PADCONF_OFF);
	/* wait for the save to complete */
	while (!(omap_ctrl_readl(OMAP343X_CONTROL_GENERAL_PURPOSE_STATUS)
			& PADCONF_SAVE_DONE))
		udelay(1);

	/*
	 * Force write last pad into memory, as this can fail in some
	 * cases according to erratas 1.157, 1.185
	 */
	omap_ctrl_writel(omap_ctrl_readl(OMAP343X_PADCONF_ETK_D14),
		OMAP343X_CONTROL_MEM_WKUP + 0x2a0);

	/* Save the Interrupt controller context */
	omap_intc_save_context();
	/* Save the GPMC context */
	omap3_gpmc_save_context();
	/* Save the system control module context, padconf already save above*/
	omap3_control_save_context();
	omap_dma_global_context_save();
}

static void omap3_core_restore_context(void)
{
	/* Restore the control module context, padconf restored by h/w */
	omap3_control_restore_context();
	/* Restore the GPMC context */
	omap3_gpmc_restore_context();
	/* Restore the interrupt controller context */
	omap_intc_restore_context();
	omap_dma_global_context_restore();
}

/*
 * FIXME: This function should be called before entering off-mode after
 * OMAP3 secure services have been accessed. Currently it is only called
 * once during boot sequence, but this works as we are not using secure
 * services.
 */
static void omap3_save_secure_ram_context(u32 target_mpu_state)
{
	u32 ret;

	if (omap_type() != OMAP2_DEVICE_TYPE_GP) {
		/*
		 * MPU next state must be set to POWER_ON temporarily,
		 * otherwise the WFI executed inside the ROM code
		 * will hang the system.
		 */
		pwrdm_set_next_pwrst(mpu_pwrdm, PWRDM_POWER_ON);
		ret = _omap_save_secure_sram((u32 *)
				__pa(omap3_secure_ram_storage));
		pwrdm_set_next_pwrst(mpu_pwrdm, target_mpu_state);
		/* Following is for error tracking, it should not happen */
		if (ret) {
			printk(KERN_ERR "save_secure_sram() returns %08x\n",
				ret);
			while (1)
				;
		}