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-rw-r--r--drivers/dma/mv_xor.c53
-rw-r--r--drivers/dma/mv_xor.h1
2 files changed, 54 insertions, 0 deletions
diff --git a/drivers/dma/mv_xor.c b/drivers/dma/mv_xor.c
index a95878cd36d9..14091f878f80 100644
--- a/drivers/dma/mv_xor.c
+++ b/drivers/dma/mv_xor.c
@@ -1085,6 +1085,57 @@ mv_xor_conf_mbus_windows(struct mv_xor_device *xordev,
writel(0, base + WINDOW_OVERRIDE_CTRL(1));
}
+/*
+ * Since this XOR driver is basically used only for RAID5, we don't
+ * need to care about synchronizing ->suspend with DMA activity,
+ * because the DMA engine will naturally be quiet due to the block
+ * devices being suspended.
+ */
+static int mv_xor_suspend(struct platform_device *pdev, pm_message_t state)
+{
+ struct mv_xor_device *xordev = platform_get_drvdata(pdev);
+ int i;
+
+ for (i = 0; i < MV_XOR_MAX_CHANNELS; i++) {
+ struct mv_xor_chan *mv_chan = xordev->channels[i];
+
+ if (!mv_chan)
+ continue;
+
+ mv_chan->saved_config_reg =
+ readl_relaxed(XOR_CONFIG(mv_chan));
+ mv_chan->saved_int_mask_reg =
+ readl_relaxed(XOR_INTR_MASK(mv_chan));
+ }
+
+ return 0;
+}
+
+static int mv_xor_resume(struct platform_device *dev)
+{
+ struct mv_xor_device *xordev = platform_get_drvdata(dev);
+ const struct mbus_dram_target_info *dram;
+ int i;
+
+ for (i = 0; i < MV_XOR_MAX_CHANNELS; i++) {
+ struct mv_xor_chan *mv_chan = xordev->channels[i];
+
+ if (!mv_chan)
+ continue;
+
+ writel_relaxed(mv_chan->saved_config_reg,
+ XOR_CONFIG(mv_chan));
+ writel_relaxed(mv_chan->saved_int_mask_reg,
+ XOR_INTR_MASK(mv_chan));
+ }
+
+ dram = mv_mbus_dram_info();
+ if (dram)
+ mv_xor_conf_mbus_windows(xordev, dram);
+
+ return 0;
+}
+
static const struct of_device_id mv_xor_dt_ids[] = {
{ .compatible = "marvell,orion-xor", .data = (void *)XOR_MODE_IN_REG },
{ .compatible = "marvell,armada-380-xor", .data = (void *)XOR_MODE_IN_DESC },
@@ -1246,6 +1297,8 @@ err_channel_add:
static struct platform_driver mv_xor_driver = {
.probe = mv_xor_probe,
+ .suspend = mv_xor_suspend,
+ .resume = mv_xor_resume,
.driver = {
.name = MV_XOR_NAME,
.of_match_table = of_match_ptr(mv_xor_dt_ids),
diff --git a/drivers/dma/mv_xor.h b/drivers/dma/mv_xor.h
index 34389146bf13..c19fe30e5ae9 100644
--- a/drivers/dma/mv_xor.h
+++ b/drivers/dma/mv_xor.h
@@ -125,6 +125,7 @@ struct mv_xor_chan {
char dummy_src[MV_XOR_MIN_BYTE_COUNT];
char dummy_dst[MV_XOR_MIN_BYTE_COUNT];
dma_addr_t dummy_src_addr, dummy_dst_addr;
+ u32 saved_config_reg, saved_int_mask_reg;
};
/**