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51 lines
1.0 KiB
51 lines
1.0 KiB
/* |
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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 "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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