This commit replaces the current magic numbers in the interrupt handling
with proper macros, which makes more readable and self-documenting.
While here replace the BUG() with a noisy WARN_ON(). There's no reason
to tear down the entire system for an DMA IRQ error.
Signed-off-by: Ezequiel Garcia <ezequiel.garcia@xxxxxxxxxxxxxxxxxx>
---
drivers/dma/mv_xor.c | 28 +++++++++-------------------
drivers/dma/mv_xor.h | 22 +++++++++++++++++++++-
2 files changed, 30 insertions(+), 20 deletions(-)
diff --git a/drivers/dma/mv_xor.c b/drivers/dma/mv_xor.c
index a30e221..4ee5bb1 100644
--- a/drivers/dma/mv_xor.c
+++ b/drivers/dma/mv_xor.c
@@ -50,9 +50,9 @@ static void mv_desc_init(struct mv_xor_desc_slot *desc,
{
struct mv_xor_desc *hw_desc = desc->hw_desc;
- hw_desc->status = (1 << 31);
+ hw_desc->status = XOR_DESC_DMA_OWNED;
hw_desc->phy_next_desc = 0;
- hw_desc->desc_command = (1 << 31);
+ hw_desc->desc_command = XOR_DESC_EOD_INT_EN;
hw_desc->phy_dest_addr = addr;
hw_desc->byte_count = byte_count;
}
@@ -105,17 +105,9 @@ static u32 mv_chan_get_intr_cause(struct mv_xor_chan *chan)
return intr_cause;
}
-static int mv_is_err_intr(u32 intr_cause)
-{
- if (intr_cause & ((1<<4)|(1<<5)|(1<<6)|(1<<7)|(1<<8)|(1<<9)))
- return 1;
-
- return 0;
-}
-
static void mv_xor_device_clear_eoc_cause(struct mv_xor_chan *chan)
{
- u32 val = ~(1 << (chan->idx * 16));
+ u32 val = ~(XOR_INT_END_OF_DESC << (chan->idx * 16));
dev_dbg(mv_chan_to_devp(chan), "%s, val 0x%08x\n", __func__, val);
writel_relaxed(val, XOR_INTR_CAUSE(chan));
}
@@ -627,18 +619,16 @@ static void mv_dump_xor_regs(struct mv_xor_chan *chan)
static void mv_xor_err_interrupt_handler(struct mv_xor_chan *chan,
u32 intr_cause)
{
- if (intr_cause & (1 << 4)) {
- dev_dbg(mv_chan_to_devp(chan),
- "ignore this error\n");
- return;
+ if (intr_cause & XOR_INT_ERR_DECODE) {
+ dev_dbg(mv_chan_to_devp(chan), "ignoring address decode error\n");
+ return;
}
- dev_err(mv_chan_to_devp(chan),
- "error on chan %d. intr cause 0x%08x\n",
+ dev_err(mv_chan_to_devp(chan), "error on chan %d. intr cause 0x%08x\n",
chan->idx, intr_cause);
mv_dump_xor_regs(chan);
- BUG();
+ WARN_ON(1);
}
static irqreturn_t mv_xor_interrupt_handler(int irq, void *data)
@@ -648,7 +638,7 @@ static irqreturn_t mv_xor_interrupt_handler(int irq, void *data)
dev_dbg(mv_chan_to_devp(chan), "intr cause %x\n", intr_cause);
- if (mv_is_err_intr(intr_cause))
+ if (intr_cause & XOR_INTR_ERRORS)
mv_xor_err_interrupt_handler(chan, intr_cause);
tasklet_schedule(&chan->irq_tasklet);
diff --git a/drivers/dma/mv_xor.h b/drivers/dma/mv_xor.h
index e03021e..ae41c31 100644
--- a/drivers/dma/mv_xor.h
+++ b/drivers/dma/mv_xor.h
@@ -34,6 +34,9 @@
#define XOR_OPERATION_MODE_MEMCPY 2
#define XOR_DESCRIPTOR_SWAP BIT(14)
+#define XOR_DESC_DMA_OWNED BIT(31)
+#define XOR_DESC_EOD_INT_EN BIT(31)
+
#define XOR_CURR_DESC(chan) (chan->mmr_high_base + 0x10 + (chan->idx * 4))
#define XOR_NEXT_DESC(chan) (chan->mmr_high_base + 0x00 + (chan->idx * 4))
#define XOR_BYTE_COUNT(chan) (chan->mmr_high_base + 0x20 + (chan->idx * 4))
@@ -48,7 +51,24 @@
#define XOR_INTR_MASK(chan) (chan->mmr_base + 0x40)
#define XOR_ERROR_CAUSE(chan) (chan->mmr_base + 0x50)
#define XOR_ERROR_ADDR(chan) (chan->mmr_base + 0x60)
-#define XOR_INTR_MASK_VALUE 0x3F5
+
+#define XOR_INT_END_OF_DESC BIT(0)
+#define XOR_INT_END_OF_CHAIN BIT(1)
+#define XOR_INT_STOPPED BIT(2)
+#define XOR_INT_PAUSED BIT(3)
+#define XOR_INT_ERR_DECODE BIT(4)
+#define XOR_INT_ERR_RDPROT BIT(5)
+#define XOR_INT_ERR_WRPROT BIT(6)
+#define XOR_INT_ERR_OWN BIT(7)
+#define XOR_INT_ERR_PAR BIT(8)
+#define XOR_INT_ERR_MBUS BIT(9)
+
+#define XOR_INTR_ERRORS (XOR_INT_ERR_DECODE | XOR_INT_ERR_RDPROT | \
+ XOR_INT_ERR_WRPROT | XOR_INT_ERR_OWN | \
+ XOR_INT_ERR_PAR | XOR_INT_ERR_MBUS)
+
+#define XOR_INTR_MASK_VALUE (XOR_INT_END_OF_DESC | \
+ XOR_INT_STOPPED | XOR_INTR_ERRORS)
#define WINDOW_BASE(w) (0x50 + ((w) << 2))
#define WINDOW_SIZE(w) (0x70 + ((w) << 2))
--
2.0.1
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