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/*
* Copyright 2008-2009 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/clk.h>
#include <linux/module.h>
#include <linux/io.h>
#include <mach/hardware.h>
#include <asm/proc-fns.h>
#include <asm/system.h>
#include <mach/clock.h>
#include <mach/hardware.h>
#include "crm_regs.h"
/*!
* @defgroup MSL_MX35 i.MX35 Machine Specific Layer (MSL)
*/
/*!
* @file mach-mx35/system.c
* @brief This file contains idle and reset functions.
*
* @ingroup MSL_MX35
*/
/*!
* MX35 low-power mode
*/
enum mx35_low_pwr_mode {
MX35_RUN_MODE,
MX35_WAIT_MODE,
MX35_DOZE_MODE,
MX35_STOP_MODE
};
extern int mxc_jtag_enabled;
/*!
* This function is used to set cpu low power mode before WFI instruction
*
* @param mode indicates different kinds of power modes
*/
void mxc_cpu_lp_set(enum mxc_cpu_pwr_mode mode)
{
unsigned int lpm;
unsigned long reg;
/*read CCMR value */
reg = __raw_readl(MXC_CCM_CCMR);
switch (mode) {
case WAIT_UNCLOCKED_POWER_OFF:
lpm = MX35_DOZE_MODE;
break;
case STOP_POWER_ON:
case STOP_POWER_OFF:
lpm = MX35_STOP_MODE;
/* Enabled Well Bias */
reg |= MXC_CCM_CCMR_WBEN;
if (!board_is_rev(BOARD_REV_1))
reg |= MXC_CCM_CCMR_VSTBY;
break;
case WAIT_CLOCKED:
case WAIT_UNCLOCKED:
default:
/* Wait is the default mode used when idle. */
lpm = MX35_WAIT_MODE;
break;
}
/* program LPM bit */
reg = (reg & (~MXC_CCM_CCMR_LPM_MASK)) | lpm << MXC_CCM_CCMR_LPM_OFFSET;
/* program Interrupt holdoff bit */
reg = reg | MXC_CCM_CCMR_WFI;
/* TBD: PMIC has put the voltage back to Normal if the voltage ready */
/* counter finished */
reg = reg | MXC_CCM_CCMR_STBY_EXIT_SRC;
__raw_writel(reg, MXC_CCM_CCMR);
}
EXPORT_SYMBOL(mxc_cpu_lp_set);
/*!
* This function puts the CPU into idle mode. It is called by default_idle()
* in process.c file.
*/
void arch_idle(void)
{
/*
* This should do all the clock switching
* and wait for interrupt tricks.
*/
if (!mxc_jtag_enabled) {
#ifdef CONFIG_MX35_DOZE_DURING_IDLE
/*set as Doze mode */
mxc_cpu_lp_set(WAIT_UNCLOCKED_POWER_OFF);
#else
/* set as Wait mode */
mxc_cpu_lp_set(WAIT_UNCLOCKED);
#endif
cpu_do_idle();
}
}
/*
* This function resets the system. It is called by machine_restart().
*
* @param mode indicates different kinds of resets
*/
void arch_reset(char mode)
{
unsigned long reg;
reg = __raw_readl(MXC_CCM_CGR0);
reg |=
(MXC_CCM_CGR0_ESDHC1_MASK | MXC_CCM_CGR0_ESDHC2_MASK |
MXC_CCM_CGR0_ESDHC3_MASK);
__raw_writel(reg, MXC_CCM_CGR0);
/* Assert SRS signal */
mxc_wd_reset();
}
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