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mtd: nand: gpmi: add gpmi dsm supend/resume support

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i.MX6SX supports deep sleep mode(DSM) that may turn off GPMI/BCH power
during suspend, add gpmi nand suspend/resume function to release DMA
channel in suspend function and re-init GPMI/BCH controller during
resume function.

Although it is not necessary to restore GPMI/BCH registers value for
i.MX6QDL, the code doesn't distinguish different platforms to keep the
code simple.

Signed-off-by: Huang Shijie <b32955@freescale.com>
Signed-off-by: Han Xu <han.xu@freescale.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
This commit is contained in:
Huang Shijie 2015-12-02 16:47:40 -06:00 committed by Brian Norris
parent 36bcc0c9c2
commit 026918e711
1 changed files with 46 additions and 1 deletions
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47
drivers/mtd/nand/gpmi-nand/gpmi-nand.c
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@ -1,7 +1,7 @@
/*
* Freescale GPMI NAND Flash Driver
*
* Copyright (C) 2010-2011 Freescale Semiconductor, Inc.
* Copyright (C) 2010-2015 Freescale Semiconductor, Inc.
* Copyright (C) 2008 Embedded Alley Solutions, Inc.
*
* This program is free software; you can redistribute it and/or modify
@ -2033,9 +2033,54 @@ static int gpmi_nand_remove(struct platform_device *pdev)
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int gpmi_pm_suspend(struct device *dev)
{
struct gpmi_nand_data *this = dev_get_drvdata(dev);
release_dma_channels(this);
return 0;
}
static int gpmi_pm_resume(struct device *dev)
{
struct gpmi_nand_data *this = dev_get_drvdata(dev);
int ret;
ret = acquire_dma_channels(this);
if (ret < 0)
return ret;
/* re-init the GPMI registers */
this->flags &= ~GPMI_TIMING_INIT_OK;
ret = gpmi_init(this);
if (ret) {
dev_err(this->dev, "Error setting GPMI : %d\n", ret);
return ret;
}
/* re-init the BCH registers */
ret = bch_set_geometry(this);
if (ret) {
dev_err(this->dev, "Error setting BCH : %d\n", ret);
return ret;
}
/* re-init others */
gpmi_extra_init(this);
return 0;
}
#endif /* CONFIG_PM_SLEEP */
static const struct dev_pm_ops gpmi_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(gpmi_pm_suspend, gpmi_pm_resume)
};
static struct platform_driver gpmi_nand_driver = {
.driver = {
.name = "gpmi-nand",
.pm = &gpmi_pm_ops,
.of_match_table = gpmi_nand_id_table,
},
.probe = gpmi_nand_probe,