53 lines
1.0 KiB
C
53 lines
1.0 KiB
C
/*
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* i.MX27 Power Management Routines
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*
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* Based on Freescale's BSP
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License.
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*/
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#include <linux/of_address.h>
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#include <linux/kernel.h>
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#include <linux/suspend.h>
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#include <linux/io.h>
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#include "common.h"
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#include "hardware.h"
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static int mx27_suspend_enter(suspend_state_t state)
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{
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void __iomem *ccm_base;
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struct device_node *np;
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u32 cscr;
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np = of_find_compatible_node(NULL, NULL, "fsl,imx27-ccm");
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ccm_base = of_iomap(np, 0);
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BUG_ON(!ccm_base);
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switch (state) {
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case PM_SUSPEND_MEM:
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/* Clear MPEN and SPEN to disable MPLL/SPLL */
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cscr = imx_readl(ccm_base);
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cscr &= 0xFFFFFFFC;
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imx_writel(cscr, ccm_base);
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/* Executes WFI */
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cpu_do_idle();
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static const struct platform_suspend_ops mx27_suspend_ops = {
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.enter = mx27_suspend_enter,
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.valid = suspend_valid_only_mem,
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};
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void __init imx27_pm_init(void)
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{
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suspend_set_ops(&mx27_suspend_ops);
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}
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