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78 lines
1.7 KiB
C
78 lines
1.7 KiB
C
/*
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* Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
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* JZ4740 SoC power management support
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <linux/init.h>
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#include <linux/pm.h>
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#include <linux/delay.h>
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#include <linux/suspend.h>
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#include <asm/mach-jz4740/regs.h>
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extern void jz4740_intc_suspend(void);
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extern void jz4740_intc_resume(void);
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static int jz_pm_enter(suspend_state_t state)
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{
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unsigned long nfcsr = REG_EMC_NFCSR;
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uint32_t scr = REG_CPM_SCR;
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/* Disable nand flash */
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REG_EMC_NFCSR = ~0xff;
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udelay(100);
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/*stop udc and usb*/
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REG_CPM_SCR &= ~( 1<<6 | 1<<7);
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REG_CPM_SCR |= 0<<6 | 1<<7;
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jz4740_intc_suspend();
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/* Enter SLEEP mode */
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REG_CPM_LCR &= ~CPM_LCR_LPM_MASK;
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REG_CPM_LCR |= CPM_LCR_LPM_SLEEP;
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__asm__(".set\tmips3\n\t"
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"wait\n\t"
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".set\tmips0");
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/* Restore to IDLE mode */
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REG_CPM_LCR &= ~CPM_LCR_LPM_MASK;
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REG_CPM_LCR |= CPM_LCR_LPM_IDLE;
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/* Restore nand flash control register */
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REG_EMC_NFCSR = nfcsr;
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jz4740_intc_resume();
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/* Restore sleep control register */
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REG_CPM_SCR = scr;
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return 0;
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}
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static struct platform_suspend_ops jz_pm_ops = {
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.valid = suspend_valid_only_mem,
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.enter = jz_pm_enter,
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};
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/*
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* Initialize power interface
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*/
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int __init jz_pm_init(void)
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{
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suspend_set_ops(&jz_pm_ops);
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return 0;
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}
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late_initcall(jz_pm_init);
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