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

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>

diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
index 235ddcb..9c311b0 100644 (file)
--- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
+++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
@@ -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,